Device for correcting a tremble of a focused image and a camera

Device for correcting a tremble of a focused image and a camera
US006449432B1
(12) United States Patent
(10) Patent N0.:
Uenaka
(54)
US 6,449,432 B1
(45) Date of Patent:
DEVICE FOR CORRECTING A TREMBLE
OF A FOCUSED IMAGE AND A CAMERA
Sep. 10, 2002
FOREIGN PATENT DOCUMENTS
WHICH IS PROVIDED WITH THE SAME
JP
5-142615
6/1993
JP
8-82823
3/1996
JP
(75) Inventor: Yukio Uenaka, Saitama (JP)
7_7177
1/1995
* cited by examiner
(73) Assignee: Asahi Kogaku KOgyO Kabushiki
Kaisha, Tokyo (JP)
Primary Exammer—Russell Adams
Assistant Examiner—Arthur Smith
( * ) Notice:
Subject to any disclaimer, the term of this
CAnOmey’ Agent’ Or FWm—Greenblum & Bernstem’
patent is extended or adjusted under 35
' '
U.S.C. 154(b) by 43 days.
(21)
(22)
_
Appl' NO" 09/609’114
Filed:
Jun. 30, 2000
_
(30)
_
_
ABSTRACT
Acapacitor is connected to an angular speed sensor through
a ?rst sWitch. A ?rst resistance is connected to the sensor
through a second sWitch and a second resistance is con
_
_
nected to the sensor through a third sWitch. The ?rst sWitch;
Forelgn Apphcatlon Pnonty Data
Jun. 30, 1999
'
(57)
the ?rst resistance and the second sWitch; and the second
(JP) ......................................... .. 11-185355
resistance and the third Switch are Connected in Parallel The
capacitor is also connected to a non-inversion-input
(51)
(58)
Int. Cl.7 .............................................. .. G02B 27/64
terminal of a buffer ampli?en An Output_termina1 of the
U-S-
bu?er
Cl-
. . . . . . . . . . . . . . . . . . . . . . . . . ..
348/208
Field Of Search ............................ .. 396/52, 53, 54,
ampli?er
is
Connected
to
a
non_inversion_input_
terminal of a difference ampli?er. The sensor is connected to
an inversion-input-terminal of the difference ampli?er. An
396/55; 35 9/554—557; 348/208
output-terminal of the difference ampli?er is connected to an
A/D conversion port of a CPU of a camera. Immediately
(56)
References Cited
U S PATENT DOCUMENTS
'
5,583,597 A
5,589,904 A
after an electric poWer is supplied to the camera, the ?rst
sWitch is closed, and the second and third sWitches are
'
opened.
12/1996 Enomoto
* 12/1996 Urata et al. ................. .. 396/55
10 Claims, 6 Drawing Sheets
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U.S. Patent
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Sep. 10, 2002
Sheet 1 0f 6
US 6,449,432 B1
U.S. Patent
Sep. 10, 2002
Sheet 2 0f 6
US 6,449,432 B1
U.S. Patent
Sep. 10, 2002
Sheet 3 0f 6
FIG. 3
US 6,449,432 B1
U.S. Patent
Sep. 10, 2002
Sheet 4 0f 6
US 6,449,432 B1
FIG. 4
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U.S. Patent
Sep. 10, 2002
US 6,449,432 B1
Sheet 5 0f 6
FIG. 5
( START )
SW102,103,112,
“S500
113—>OFF
SW101,111+ON
“S502
SW101,103,111,
“S504
113->OFF
SW102,112»0N
S506
PHOTOMETRY
SW 21 ON ?
PHOTOMETRY,
Av-Tv CALCULATED
RELEASE
SW 22 ON ?
“S508
U.S. Patent
Sep. 10, 2002
US 6,449,432 B1
Sheet 6 0f 6
FIG. 6
2
APERTURE ADJUSTED,
“S512
MIRROR UP, SHUTTER OPENED
SW101,102,111,
112—>OFF
SW103,113—>ON
OUTPUT OF ANGULAR SPEED “S516
SENSORS A/D CONVERSION
INTEGRATION OF
ANGULAR SPEED
OUTPUT OF MR SENSORS
A/D CONVERSION
S520
DRIVING AMOUNT OF
“S522
MOTORS CALCULATED
DRIVING SIGNAL OF ~S524
MOTORS OUTPUT
S526
EXPOSURE
TIME ELAPSED
?
SHUTTER CLOSED, APERTURE
OPENED, MIRROR DOWN
END
US 6,449,432 B1
1
2
DEVICE FOR CORRECTING A TREMBLE
OF A FOCUSED IMAGE AND A CAMERA
WHICH IS PROVIDED WITH THE SAME
an accurate correction of the focused image tremble is able
to be performed immediately after the device begins to be
operated. Another object of the present invention is to
provide a camera, provided With the correcting device.
In accordance With an aspect of the present invention,
BACKGROUND OF INVENTION
1. Field of the Invention
This invention relates to a device for correcting a tremble
of a focused image of an object caused by an oscillation of
an optical device due to, for example, a hand tremble.
2. Description of the Related Art
Usually, a device for correcting a tremble of a focused
image is mounted in an optical device, for example a
there is provided a device for correcting a tremble of a
focused image comprising: a plurality of tremble detectors
that detect a tremble of an optical axis of an optical device;
10
ling system that controls the driving devices such that the
correction optical system is driven in order to cancel a
focused image tremble of an object due to the tremble of the
camera. The correcting device is provided With angular
speed sensors, Which are used for detecting the tremble of an
optical device. In the correcting device, an amount of the
a correction optical system that corrects the tremble; driving
devices that drive the correction optical system; a control
optical axis; direct-current-component removing systems
15
tremble is calculated, by integrating output signals output
that respectively output a signal obtained by removing a
direct-current-component from an output signal Which is
output from a corresponding tremble detector of the tremble
from the angular speed sensors. The correcting device is
provided With a correction optical system Which is included
in a photographing optical system of the camera. The
correction optical system is driven based on the result of
detectors; and tremble-detection initialiZing systems that
respectively initialiZe the output signal of the corresponding
tremble detector.
calculation of the amount of the tremble, so that a movement
Each of the direct-current-component removing systems
of the focused image Which is imaged on an imaging plane,
for example, a ?lm plane and an imaging plane of a
photoelectric conversion element, can be corrected.
includes: a circuit element that has a predetermined resis
tance value; a capacitor; and a difference ampli?er that
outputs a difference betWeen an input signal input from a
25
A gyro sensor is used as the angular speed sensors. An
output signal of the gyro sensor is subjected to predeter
mined operations of electric circuits Which are provided in
the gyro sensor. Accordingly, there is a possibility that a null
voltage is output from the gyro sensor, When the gyro sensor
stands still. Namely, even if the tremble does not occur,
output signal of the angular speed sensor does not reach “0”.
Each of the direct-current-component removing systems
As described above, direct-current-component, for
example, the null voltage and so on, is included in the output
signal of the angular speed sensor. The angular speed due to
the hand tremble is affected by the direct-current-component
35
corresponding tremble detector and the capacitor; and a
second resistance, having a resistance value Which is greater
than that of the ?rst resistance, that is connectable betWeen
the corresponding tremble detector and the capacitor. Each
of the tremble-detection initialiZing systems includes a ?rst
output signal of the angular speed sensor is directly used for
sWitch system by Which the corresponding tremble detector
45
sensor by the CR circuit, so that an output signal corre
sponding tremble detector and the capacitor; and a third
sWitch system that connects the second resistance betWeen
circuit.
In the CR circuit, a cut-off-frequency is determined by a
time instant of the CR circuit. In other Words, the time
instant is set in accordance With the cut-off-frequency. On
the other hand, it takes a predetermined time to ?nish
the corresponding tremble detector and the capacitor.
In the second signal line, the ?rst resistance and the
removing the null voltage, in accordance With the time
55
device, a photographing operation is started after the
removal of the null voltage is ?nished. Accordingly, there is
a problem of missing a photographing opportunity. Further,
if the photographing operation is started before the null
capacitor are connected in series, and the second resistance
and the capacitor are connected in series. Further, in the
second signal line, the ?rst sWitch system; the second sWitch
system and the ?rst resistance; and the third sWitch system
and the second resistance are connected in parallel. When
the ?rst sWitch system is closed and the second sWitch
system and the third sWitch system are opened, the output
signal is initialiZed by the difference ampli?er. Immediately
after an electric poWer is supplied to the optical device, only
the ?rst sWitch system is closed.
In accordance With another aspect of the present
invention, there is provided a device for correcting a tremble
of a focused image comprising: a plurality of tremble
voltage is completely removed, there is another problem that
the accuracy of the tremble correction is loWered due to a
remaining null voltage.
SUMMARY OF THE INVENTION
and the capacitor are connected in series. The cut-off
frequency changing system includes: a second sWitch sys
tem that connects the ?rst resistance betWeen the corre
sponding to only the angular speed can be obtained. Further,
the above-mentioned null voltage is also removed by the CR
Therefore, an object of the present invention is to provide
a device for correcting the focused image tremble, in which
output signal.
includes: a ?rst resistance that is connectable betWeen the
calculating an amount of the tremble, it is probable that an
error is included in the result of the calculation.
In order to avoid such a problem, a CR circuit of high-pass
type, Which comprises a capacitor and a resistance, is
connected to the gyro sensor. The direct-current-component
instant.
In the camera Which is provided With the correcting
includes a cut-off-frequency changing system that changes a
frequency of a frequency component removed from the
Each of the direct-current-component removing systems
to no small extent. The direct-current-component is changed
by a temperature and a time passing. Accordingly, if the
is removed from the output signal of the angular speed
?rst signal line that is connected to the corresponding
tremble detector and an input signal input from a second
signal line that is connected to the corresponding tremble
detector through the circuit element and the capacitor. Each
of the tremble-detection initialiZing systems short-circuits
the circuit element and connects only the capacitor in the
second signal line.
65
detectors that detect a tremble of an optical axis of an optical
device; a correction optical system that corrects the tremble;
driving devices that drive the correction optical system; a
US 6,449,432 B1
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controlling system that controls the driving devices such that
the capacitor are connected in series. Further, in the second
the correction optical system is driven in order to cancel a
focused image tremble of an object due to the tremble of the
signal line, the ?rst sWitch system; the second sWitch system
and the ?rst resistance; and the third sWitch system and the
second resistance are connected in parallel. Immediately
optical axis; and difference ampli?ers that respectively out
puts a difference betWeen an input signal input from a ?rst
signal line that is connected to a corresponding tremble
after an electric poWer is supplied to the camera, only the
?rst sWitch system is closed; during a photometry operation,
only the second sWitch system is closed; and While the image
capturing operation is carried out, only the third sWitch
detector of the tremble detectors and an input signal input
from a second signal line that is connected to the corre
sponding tremble detector through a circuit element and a
capacitor. When the circuit element is short-circuited and the
capacitor and the corresponding tremble detector are con
nected in series, an output signal of the corresponding
tremble detector is initialiZed by a corresponding difference
ampli?er of the difference ampli?ers.
In accordance With another aspect of the present
system is closed.
10
BRIEF DESCRIPTION OF THE DRAWINGS
The object and other objects of the present invention Will
be better understood from the folloWing description, With
reference to the accompanying draWings, in Which:
15
invention, there is provided a camera Which is provided With
FIG. 1 is a block diagram of a camera, including a
function of correcting a tremble of a focused image, to
a device for correcting a tremble of a focused image com
Which an embodiment, according to the present invention, is
prising: a photographing optical system; tremble detectors
applied;
that detect a tremble of an optical axis of the photographing
FIG. 2 is a perspective vieW of a driving device of a
optical system; a correction optical system that corrects the
correcting optical system of the embodiment;
tremble of the optical axis, being provided for the tremble
FIG. 3 is a front vieW of the driving device of FIG. 2,
vieWed from the side of an other optical system of a
correcting device so as to be included in the photographing
optical system; driving devices that drive the correction
optical system; a photographing controlling system that
controls an image capturing operation to record an image of
the object; and a tremble correction controlling system that
controls the driving device such that a focused image
photographing optical system;
25
tremble of an object due to the tremble of the optical axis can
be canceled; direct-current-component removing systems
that respectively output a signal obtained by removing a
direct-current-component from an output signal Which is
output from a corresponding tremble detector of the tremble
ment.
DESCRIPTION OF THE PREFERRED
EMBODIMENTS
detectors; and removing system controllers that respectively
initialiZe the output signal of the corresponding tremble
detector.
35
Each of the direct-current-component removing systems
includes: a circuit element that has a predetermined resis
tance value; a capacitor; and a difference ampli?er that
outputs a difference betWeen an input signal input from a
to a surface of a ?lm When a camera is held in such a manner
an axis Which divides the camera into tWo parts in the
vertical direction, crossing the optical axis of the photo
graphing optical system in the perpendicular plane, and “a
from a second signal line that is connected to the corre
vertical axis” means an axis Which divides the camera into
45
tWo parts in a lateral direction.
FIG. 1 is shoWs a camera 1, including a correcting
function of a focused image to Which an embodiment,
according to the present invention, is applied. The camera 1
is provided With an objective optical system 2, a quick return
mirror 3, a ?nder optical system 4, an AF sensor 7, a
sub-mirror 8, a shutter button 20, a controlling system 30
and a correcting system 40 of a focused image tremble. The
correcting system 40 is provided With a correction lens 401
output signal.
Each of the direct-current-component removing systems
includes: a ?rst resistance that is connectable betWeen the
corresponding tremble detector and the capacitor; and a
second resistance, having a resistance value Which is greater
than that of the ?rst resistance, that is connectable betWeen
the corresponding tremble detector and the capacitor. Each
of the tremble-detection initialiZing systems includes a ?rst
An embodiment according to the present invention Will be
explained With reference to the ?gures. Note that, in this
speci?cation, “a perpendicular plane” means a plane parallel
that an optical axis of a photographing optical system is
positioned horiZontally. Further, “a horiZontal axis” means
?rst signal line that is connected to a corresponding tremble
detector of the tremble detectors and an input signal input
sponding tremble detector through the circuit element and
the capacitor. Each of the tremble-detection initialiZing
systems short-circuits the circuit element and connects only
the capacitor in the second signal line.
Each of the direct-current-component removing systems
includes a cut-off-frequency changing system that changes a
frequency of a frequency component removed from the
FIG. 4 is a block diagram of a controlling system of the
camera of the embodiment;
FIG. 5 is a ?rst half of a ?oWchart indicating procedures
of a camera controlling sequence of the embodiment; and
FIG. 6 is a latter half of the ?oWchart indicating proce
dures of the camera controlling sequence of the embodi
(correction optical system). Aphotographing optical system
55
of the camera 1 includes the objective optical system 2 and
the correction lens 401.
An object image is imaged on a surface of a ?lm F, Which
is an image receiving surface, by the photographing optical
sWitch system by Which the corresponding tremble detector
system. A luminance re?ected by the object is led to an eye
and the capacitor are connected in series. The cut-off
frequency changing system includes: a second sWitch sys
of a user, by the ?nder optical system 4, after passing
through the objective optical system 2 of the photographing
optical system and being re?ected by the quick return mirror
tem that connects the ?rst resistance betWeen the corre
sponding tremble detector and the capacitor; and a third
sWitch system that connects the second resistance betWeen
the corresponding tremble detector and the capacitor.
In the second signal line, the ?rst resistance and the
capacitor are connected in series, the second resistance and
65
3. The luminance re?ected by the object is also led to the AF
sensor 7 after being re?ected by the sub-mirror 8. The
controlling system 30 Wholly controls the camera 1.
Further, the camera 1 is provided With angular speed
sensors 51, 52 and a lens movement detector 60. A tremble
US 6,449,432 B1
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6
of the photographing optical system is sensed by the angular
tive optical system 2 including the focusing lens, the cor
rection lens 401 of the correction system 40, the quick return
mirror 3, the focusing screen B, the pentagonal prism and the
eyepiece lens 9.
speed sensors 51 and 52. The movement of the photograph
ing optical system along the optical aXis is detected by the
lens movement detector 60.
The shutter button 20 can be pushed by one step to turn
a photometry sWitch to an ON position, and can be pushed
by tWo steps to turn a release sWitch to an ON position. The
The quick return mirror 3 and a sub-mirror 8 are set to an
up position, at Which the quick return mirror 3 faces to the
information of ON/OFF position of these sWitches is input
into the controlling system 30. Note that, the photometry
focusing screen B, by a mirror driving device (omitted in
FIG. 1), When the photographing is carried out. Accordingly,
When the photographing is carried out, the luminance
sWitch and the release sWitch are omitted in FIG. 1.
re?ected by the object is led to the surface of the ?lm F
through the objective optical system 2 and the correction
The angular speed sensor 51 is provided for detecting an
angular speed of the rotational movement of the camera 1 in
lens 401 of the focused image correcting device 40, so that
the object image is imaged on the surface of the ?lm F. The
object image is recorded on the surface of the ?lm F to be
a lengthWise direction (the vertical direction). The angular
speed sensor 51 outputs a voltage corresponding to the
angular speed in the lengthWise direction due to, for
15
printed.
example, a hand tremble. The angular speed sensor 52 is
When a lens barrel 5 is rotated, the focusing lens is moved
provided for detecting an angular speed of the rotational
along the optical aXis of the photographing optical system,
movement of the camera 1 in a direction perpendicular to a
by a cam mechanism (omitted in FIG. 1) Which is Well
sheet of FIG. 1 (horiZontal direction). The angular speed
knoWn. The lens barrel 5 is rotated by a motor mounted on
sensor 52 outputs a voltage corresponding to the angular
speed in the lateral direction due to, for example, the hand
tremble.
manual operation of a focusing ring 55.
a body of the camera 1 or on a lens unit, or by a user s
An AF sensor 7 detects a defocus amount of the photo
The correcting system 40 for the focused image tremble
is provided With the correction lens 401 Which is included in
the photographing optical system and a driving system to
drive the correcting optical system. The correction lens 401
is provided for de?ecting the optical aXis of the photograph
graphing optical system by a phase difference detecting
25
method, Which is a Well-knoWn sensor. An image sensor
(omitted in FIG. 1) included in the AF sensor 7 is placed to
be optically equivalent to the focusing screen B and the
surface of the ?lm F. A focusing condition on the focusing
ing optical system. The driving system drives the correction
screen B is similar to a focusing condition on the surface of
lens 401, in accordance With a controlling signal output from
the controlling system 30, so that the movement of the object
image formed on the surface of the ?lm F by the photo
graphing optical system can be canceled. The driving system
the ?lm F. Accordingly, When the object image is focused on
the focusing screen B by the photographing optical system,
in other Words, When the focal point of the photographing
optical system is coincident With the focusing screen B, the
de?ects the optical aXis of the photographing optical system
independently in the perpendicular direction to the sheet of
FIG. 1 and the lengthWise direction.
When the movement of the photographing optical system
is detected by the lens movement detector 60 and When the
photographing is performed, the controlling system 30 cor
rects the focused image tremble, on the surface of the ?lm
F and in a ?nder vieW, by driving the correcting optical
35
amount. Namely, the AF sensor 7 detects the defocus amount
Which indicates a direction and distance of a present position
of the focal point of the image formed by the photographing
optical system, from the focusing screen B and the surface
of the ?lm F. The controlling system 30 calculates a driving
system 40 based on input signals from the angular speed
sensors 51 and 52.
In FIG. 1, the objective optical system 2 of the photo
graphing optical system is depicted as a single lens.
object image is focused on the surface of the ?lm F.
The AF sensor 7 detects the focusing condition of the
object image on the surface of the ?lm F as the defocus
45
direction and a driving amount of the focusing lens based on
the defocus amount detected by the AF sensor 7. The
focusing lens is driven in accordance With a result of the
calculation of the controlling system 30, so that an automatic
HoWever, the objective optical system 2 practically includes
focusing is performed.
a plurality of lenses or lens groups. Some or all of the lenses
The lens movement detector 60 is provided With a pinion
gear 61, a slit board 62 and a photo interrupter 63. The
pinion gear 61 is engaged With a rack 5a Which is formed on
an outer surface the lens barrel 5. A shaft 61a is ?Xedly
can be moved along the optical aXis of the photographing
optical system, for focusing operation and Zooming opera
tion. In this embodiment, the lens movement detector 60
detects the movement of a lens group provided for the
focusing operation. This lens group is referred to as a
engaged at a center of pinion gear 61, being perpendicular
to the pinion gear 61. The slit board 62 is ?Xedly supported
“focusing lens”. Note that, the objective optical system 2 of
optical system 4. Aluminance re?ected by the object, Which
by one end of the shaft 61a. Another end of the shaft 61a is
rotatably received by a hole formed on an inner Wall of the
body of camera 1. Namely, the slit board 62 is rotated in
accordance With a rotational movement of the pinion gear
61. A plurality of slits are radially formed on the slit board
62 around a rotating aXis of the slit board 62. The photo
is incident on the camera 1 through the photographing
interrupter 63 includes a light emitting portion 63a and a
optical system including the focusing lens and the correction
light receiving portion 63b. The slitboard 62 is placed
betWeen the light emitting portion 63a and the light receiv
ing portion 63b. The light receiving portion 63b outputs a
signal depending upon Whether light is received. Namely,
the signal is periodically output from the light receiving
the photographing optical system is referred to as “other
optical systems” in this speci?cation.
55
The quick return mirror 3 is set to a doWn position as
shoWn in FIG. 1, When an object is vieWed through the ?nder
system 40, is re?ected by the quick return mirror 3 to be led
to a focusing screen B. The object image on the focusing
screen B is inverted by a pentagonal prism included in the
?nder optical system 4, so that the user vieWs the object
image on the focusing screen B as an erected image through
an eyepiece lens 9. Namely, in this embodiment, a ?nder
optical system in a broad sense is provided With the objec
65
portion 63b in accordance With a rotation of the slit board 62.
As described above, the lens barrel 5 is rotated by the motor
mounted on the body of the camera 1 or the lens unit in an
US 6,449,432 B1
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auto focus mode, and rotated by the user’s manual operation
in a manual mode. Accordingly, a pulse signal is output from
the light receiving portion 63b in accordance With the
rotation of the slit board 62 accompanying the rotation of the
lens barrel 5 in the focusing operation.
FIG. 2 is an exploded perspective vieW of the correcting
system 40 of the focused image tremble. The correction lens
401, Which is a part of the correcting optical system, is
?xedly engaged in a lens frame 410. The lens frame 410 is
ling system 30 detects the movement of the correction lens
401 in the direction H by an output signal from the MR
?xed to a ?rst rotating board 420. The ?rst rotating board
420 is rotatably mounted on a second rotating board 430 by
a pivot shaft 421. The second rotating board 430 is rotatably
mounted on a base board 440 by a pivot shaft 431. The pivot
shaft 431 is positioned, being rotated from the pivot shaft
421 by 90 degrees With an optical axis O of the above
sensor 438.
An opening portion 442, through Which the small diam
eter portion 412 is pierced, is formed on the base board 440.
The opening portion 442 is formed in such a manner that the
movement of the small diameter portion 412, in accordance
With the rotation of the ?rst and second rotating boards 420,
10
second rotating board 430 and the base board 440 are
constructed, depicted from the side of the objective optical
15
mentioned photographing optical system being a rotational
and a small diameter portion 412. The small diameter
system 2. This situation is referred to as a “standard situa
tion”. In the standard situation, the rotational center of the
pivot shaft 421 of the ?rst rotating board 420, the optical axis
O, the magnet 427 and the MR sensor 428 are positioned on
25
a straight line 0t. Similarly, in the standard situation, the
rotational center of the pivot shaft 431 of the second rotating
board 430, the optical axis O, the magnet 437 and the MR
sensor 438 are positioned on a straight line [3.
Note that, the straight line [3 corresponds to the above
mentioned horiZontal axis, and the straight line [3 corre
sponds to the above-mentioned vertical axis.
FIG. 4 is a block diagram of the controlling system 30.
Input and output signals of a CPU 31 Which is provided for
a pivot hole 439 Which is formed on the second rotating
board 430. An arm 424 is formed at an opposite side to the
pivot shaft 421 With the opening portion 422 therebetWeen.
A screW hole 423 is formed in the arm 424.
A screW 426, Which is connected to a rotational axis of a
the above-mentioned controlling system 30, Will be
motor 425 by a ?exible joint, is threadably engaged With the
explained With reference to the block diagram. Information
of the ON/OFF status of the photometry sWitch 21, in
accordance With the operation of the shutter button 20 (see
FIG. 1), is input to a port P11 of the CPU 31, as a digital
pulse of one bit. Also, information of the ON/OFF status of
the release sWitch 22, in accordance With the operation of the
shutter button 20, is input to a port P12 of the CPU 31, as
a digital pulse of one bit. Voltage output from the MR sensor
428 is input to an A/D conversion port AD3 of the CPU 31,
screW hole 423. The motor 425 is ?xed on the second
rotating board 430. When the motor 425 is driven, the ?rst
rotating board 420 is rotatably moved around the pivot shaft
421 in the direction V, in accordance With the rotational
movement of the screW 426.
Amagnet 427 is mounted on a tip end of the arm 424. An
MR (Magnetic Resistance) sensor 428 is mounted on the
second rotating board 430, facing toWards the magnet 427.
45
is formed in such a manner that, the movement of the small
diameter portion 412, in accordance With the rotation of the
?rst rotating board 420, is not prevented, When the ?rst
rotating board 420 is mounted on the second rotating board
430.
A driving arm 434 is formed at an opposite side to the
optical axis of the objective optical system 2 (the other
Namely, in FIG. 3, the optical axis of the correction lens 401
coincides With the optical axis of the objective optical
portion 412 is engaged With an opening portion 422 of the
?rst rotating board 420. The pivot shaft 421 is received by
Positional data of the magnet 427 is detected by the MR
sensor 428. The controlling system 30 detects the movement
of the correction lens 401 in the direction V by an output
signal from the MR sensor 428.
The pivot shaft 431 is received by a pivot hole 449 Which
is formed on the base board 440. An opening portion 432, by
Which the small diameter portion 412 is received, is formed
on the second rotating board 430. The opening portion 432
system 2 of the photographing optical system. In FIG. 3, an
optical axis of the correction lens 401 is coaxial With the
optical system of the photographing optical system).
center. The base board 440 is ?xedly mounted in the camera
1.
Accordingly, the correction lens 401 is held, being mov
able in directions H and V (indicated by arroWs in FIG. 2)
in a plan perpendicular to the optical axis O in accordance
With the rotational movement of the ?rst and second rotating
boards 420, 430.
The lens frame 410 includes a large diameter portion 411
430, is not prevented.
FIG. 3 is a front vieW shoWing the correcting system 40,
in Which the lens frame 410, the ?rst rotating board 420, the
55
and voltage output from the MR sensor 438 is input to an
A/D conversion port AD4 of the CPU 31.
A motor 425, Which drives the ?rst rotating board 420, is
connected to a D/A output port DA1 through a motor driving
circuit 461, and a motor 435, Which drives the second
rotating board 430, is connected to a D/A output port DA2
through a motor driving circuit 462. In the CPU 31, moving
amounts of the correction lens 401 in the directions H and
V, by Which the focused image tremble is corrected, are
calculated based on the above mentioned input signals, and
the moving amounts of the correction lens 401 are respec
tively converted to the driving amounts of the motors 425
and 435. Then, voltage corresponding to the driving
motor 435 by a ?exible joint, is threadably engaged With the
amounts of the motors 435 and 425 is respectively output
from the D/A ports DA1 and DA2.
An output signal from the angular speed sensor 51 is led
to a signal line 11L (?rst signal line) and a signal line 12L
pivot shaft 431 With the opening portion 432 therebetWeen.
A screW 436, Which is connected to a rotational axis of a
screW hole 433. When the motor 435 is driven, the second
(second signal line). The angular speed sensor 51 is con
rotating board 430 is rotatably moved around the pivot shaft
nected to an inversion-input terminal of a difference ampli
431 in the direction H, in accordance With the rotational
?er 105 through a resistance, by the signal line 11L. An
output terminal of the difference ampli?er 105 is connected
to the inversion-input terminal, to compose a negative
feedback ampli?er. Further, the output terminal of the dif
ference ampli?er 105 is connected to anA/D conversion port
movement of the screW 436.
A magnet 437 is mounted on a tip end of the driving arm
434. An MR sensor 438 is mounted on the base board 440, 65
facing toWards the magnet 437. Positional data of the
magnet 437 is detected by the MR sensor 438. The control
AD1 of the CPU 31.
US 6,449,432 B1
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In the signal line 12L, a capacitor C1, Which is grounded,
is connected to the angular speed sensor 51 in series through
an analog sWitch 101 (?rst sWitch system). Aresistance R11
(?rst resistance) is connected to the angular speed sensor 51
in series through an analog sWitch 102 (second sWitch
system). Also, a resistance R12 (second resistance) is con
second input port P12 after the release sWitch 22 is turned to
the ON position by pushing the shutter button 20 by tWo
steps.
FIG. 5 is a ?oWchart indicating procedures of the tremble
correcting operation of the focused image, performed in the
camera 1. When an electric poWer is supplied to the camera
nected to the angular speed sensor 51 in series through an
1, the performance is started. At step S500, a control signal
analog sWitch 103 (third sWitch system). The analog sWitch
of sWitch ON is output from the port P21 of the CPU 31 and
a control signal of sWitch OFF is output from the ports P22
and P23. Namely, the sWitches 101 and 111 are closed (i.e.
101; the analog sWitch 102 and the resistance R11; and the
analog sWitch 103 and the resistance R12 are connected in
parallel. The analog sWitch 101 is connected to a port P21,
the analog sWitch 102 is connected to a port P22, and the
analog sWitch 103 is connected to a port P23. Namely,
ON/OFF of each analog sWitch is controlled by controlling
signals output from the CPU 31.
10
sWitched ON state), and the sWitches 102, 103, 112 and 113
are opened (i.e. sWitched OFF state).
Accordingly, an output voltage V1v of the angular speed
sensor 51 is charged in the capacitor C1, and a value of an
15
non-inversion-input terminal of a difference ampli?er 105.
Circuits similar to the circuits connected to the angular
output voltage V211 of the buffer ampli?er 104 coincides
With the value of the output voltage V1v. Therefore, input
voltages of the inversion-input terminal and the non
inversion-input terminal of the difference ampli?er 105 are
the output voltage V1v of the angular speed sensor 51, so
that an output voltage V3v of the difference ampli?er 105
speed sensor 51 are connected to the angular speed sensor
becomes “0”.
52. An output signal from the angular speed sensor 52 is led
to a signal line 21L (?rst signal line) and a signal line 22L
(second signal line). The angular speed sensor 52 is con
sensor 52 is charged in the capacitor C2, and a value of an
The capacitor Cl is also connected to a non-inversion
input terminal (+) of a buffer ampli?er 104. An output
terminal of the buffer ampli?er 104 is connected to a
nected to an inversion-input terminal of a difference ampli
Similarly, an output voltage V1h of the angular speed
25
?er 115, by the signal line 21L. In signal line 22L, analog
sWitches 111, 112 and 113, Which are connected in parallel,
are connected to the angular speed sensor 52. The analog
sWitch 111 is directly connected to a capacitor C2. The
analog sWitches 112 and 113 are respectively connected to
the capacitor C2 through resistances R21 and R22. The
capacitor C2 is connected to a non-inversion-input terminal
of a buffer ampli?er 114. An output terminal of the buffer
ampli?er 114 is connected to a non-inversion-input terminal
of the difference ampli?er 115 through a resistance. An
output terminal of the difference ampli?er 115 is connected
voltages of the inversion-input terminal and the non
inversion-input terminal of the difference ampli?er 115 are
the output voltage V1h of the angular speed sensor 52, so
that an output voltage V3h of the difference ampli?er 115
becomes “0”.
As described above, the value of input voltages input to
35
camera 1, an effect can be obtained, Which is equal to an
As described above, in the difference ampli?er 105, a
difference, betWeen a signal Which is output from the
angular speed sensor 51 and input to the inversion-input
terminal, and a signal Which is output from the angular speed
sensor 51 and input to the non-inversion-input terminal
optical aXis of the other optical system of the photographing
optical system, so that the tremble correcting operation is
accurately performed.
through the capacitor C1, the resistance R11 and resistance
calculated and ampli?ed.
Similarly, in the difference ampli?er 115, a difference,
betWeen a signal Which is output from the angular speed
the A/D conversion input terminals AD1 and AD2 becomes
“0” by the ON/OFF control at step S500. In other Words,
immediately after the electric poWer is supplied to the
effect that a null voltage included in the output voltages of
the angular speed sensors is removed. Accordingly, the
tremble correcting operation is started in a state that the
optical aXis of the correction lens 402 is coaxial With the
to an A/D conversion port AD2.
R12, Which are connectable to the signal line 12L, is
output voltage V2h of the buffer ampli?er 114 coincides
With the value of the output voltage V1h. Therefore, input
45
At step S502, a digital-rotational-displacement-value V5v
along the vertical aXis and a digital-rotational-displacement
value V5h along the horiZontal aXis are set to “0”, being
initialiZed. Note that the values V511 and V5h Will be
explained beloW.
sensor 52 and input to the inversion-input terminal, and a
At step S504, the control signal of sWitch ON is output
from the port P22, and the control signal of sWitch OFF is
output from the ports P21 and P23. Namely, the sWitches
102 and 112 are closed, and the sWitches 101, 103, 111 and
signal Which is output from the angular speed sensor 52 and
input to the non-inversion-input terminal through the capaci
tor C2, the resistance R21 and resistance R22, Which are
connectable to the signal line 22L, is calculated and ampli
113 are opened, so that a CR direct-current-component cut
?ed.
In the CPU 31, an eXposure value (Ev) is calculated by
performing a photometry operation of a luminance re?ected
circuit (integrating circuit) is made by the resistance R11 and
55
the capacitor C1, and a CR direct-current-component cut
circuit (integrating circuit) is made by the resistance R21
by the object through a photometry mechanism (omitted in
FIG. 4), When the ON signal is input to the ?rst input port
and the capacitor C2. Resistance values of the resistances
P11 after the photometry sWitch 21 is turned to the ON
R11 and R21 are set smaller than resistance values of the
resistances R12 and R22. Accordingly, a time constant
position by pushing the shutter button 20 by one step. Then,
determined by the resistance R11 and the capacitor C1 and
a time constant determined by the resistance R21 and the
an aperture value (Av) and an eXposure time (Tv) are
calculated based on the Ev, in the CPU 31.
Further, under the control of the CPU 31, an aperture
device (omitted in FIG. 4) is adjusted based on the Av, the
quick return mirror 3 (see FIG. 1) is set to an up position, and
then a shutter device (omitted in FIG. 4) is driven at a
predetermined speed, When the ON signal is input to the
65
capacitor C2 are relatively small.
Therefore, a cut-off-frequency, Which is removed by the
CR direct-current-component cut circuit made by the resis
tance R11 and the capacitor C1, is set relatively high.
Similarly, a cut-off-frequency, Which is removed by the CR
direct-current-component cut circuit made by the resistance
US 6,449,432 B1
11
12
R21 and the capacitor C2, is set relatively high. For
example, the output voltages of the angular speed sensors 51
by the resistance R22 and the capacitor C2. Accordingly, the
relatively loW frequency component is not removed, being
and 52 respectively include a large direct-current
component, When a pan operation is performed in order to
settle on a composition before the photographing operation
treated as the hand tremble in the tremble correction.
Therefore, the tremble correction is carried out more accu
is started by pushing the shutter button 20 by tWo steps.
Under such a situation, the large direct-current-component is
quickly removed by the above-mentioned CR direct-current
The output voltage V3v, in Which the relatively loW
frequency component is removed from the output voltage
rately.
V1v of the angular speed sensor 51, is output from the
difference ampli?er 105 and input to the A/D conversion
component cut circuits.
The output voltage V3v, in Which the relatively high
frequency component is removed from the output voltage
10
V1v of the angular speed sensor 51, is output from the
difference ampli?er 105 and input to the A/D conversion
port AD1. Similarly, the output voltage V3h, in Which the
relatively high frequency component is removed from the
output voltage V1h of the angular speed sensor 52, is output
from the difference ampli?er 115 and input to the A/D
conversion port AD2.
15
value to be set to a digital-detected-variable V4h along the
horiZontal axis.
Subsequently, at step S518, a digital-rotational
displacement-value V5v, Which de?nes a rotational dis
placement of the ?rst rotating board 420 along the vertical
so on are calculated.
return mirror 3 is set to the up position, and the shutter
device is driven at a predetermined speed.
axis [3, is calculated by integrating the digital-detected
25
variable V4v. Also, a digital-rotational-displacement-value
V5h, Which de?nes the rotational displacement of the sec
ond rotating board 430 along the horiZontal axis a, is
calculated by integrating the digital-detected-vertical V4h.
At step S520, an analog signal detected by the MR sensor
428 is read from the A/D conversion port AD3. The analog
signal detected by the MR sensor 428 corresponds to a
present position of the ?rst rotating board 420. The analog
35
At step S514, the control signal of sWitch ON is output
from the port P23, and the control signal of sWitch OFF is
output from the ports P21 and P22. Accordingly, the
sWitches 103 and 113 are closed, and the sWitches 101, 102,
signal of the MR sensor 428 is converted to a digital value,
before being stored in a digital-present-position-value V6v
along the vertical axis. The value V6v corresponds to a
present position of the correction lens 401 along the direc
tion V (see FIGS. 2 and 3). Also, an analog signal detected
by the MR sensor 438 is read from the A/D conversion port
AD4. The analog signal detected by the MR sensor 438
corresponds to a present position of the second rotating
board 430. The analog signal of the MR sensor 438 is
converted to a digital value, before being stored in a digital
111 and 112 are opened, so that a CR direct-current
component cut circuit is made by the resistance R12 and the
capacitor C1, and a CR direct-current-component cut circuit
is made by the resistance R22 and the capacitor C2.
As described above, the resistance values of the resis
tances R12 and R22 are respectively greater than the resis
At step S516, the angular speed V3v, input to the port
AD1, is converted to a digital value to be set to a digital
detected-variable V4v along the vertical axis, and the angu
lar speed V3h, input to the port AD2, is converted to a digital
from the difference ampli?er 115 and input to the A/D
conversion port AD2.
Then, at step S506, it is checked Whether the photometry
sWitch is ON. If the photometry sWitch is ON, the process
goes to step S508. At step S508, the photometry operation is
performed, and the aperture value and the exposure time and
Subsequently, at step S510, it is checked Whether the
release sWitch 22 is ON. If the release sWitch is OFF, the
process returns to step S506, and if the release sWitch is ON,
the process goes to step S512. Namely, until the release
sWitch is turned to the ON position, the procedures from step
S506 through step S510 are repeatedly performed.
When the release sWitch is turned to the ON position by
pushing the shutter button 20 by tWo steps, and the ON
signal is input to the input port P12, the process goes to step
S512. At step S512, the aperture device is adjusted, the quick
port AD1. Similarly, the output voltage V3h, in Which the
relatively loW frequency component is removed from the
output voltage V1h of the angular speed sensor 52, is output
present-position-value V6h along the horiZontal axis. The
value V6h corresponds to a present position of the correction
tance values of the resistances R11 and R21. Accordingly, a
time constant determined by the resistance R12 and the
lens 401 along the direction H (see FIGS. 2 and 3).
At step S522, a digital-rotational-driving-value V7v along
the vertical axis is calculated by subtracting the digital
present-position-value V6v along the vertical axis from the
capacitor C1 is greater than the time constant determined by
digital-rotational-displacement-value V5v. The V7v is a
the resistance R11 and the capacitor C1, and a time constant
driving value of the ?rst rotating board 420 from the present
position along the vertical axis. Namely, the V711 corre
determined by the resistance R22 and the capacitor C2 is
greater than the time constant determined by the resistance
R21 and the capacitor C2.
Namely, a cut-off-frequency, Which is removed by the CR
circuit made by the resistance R12 and the capacitor C1, is
loWer than the cut-off-frequency, Which is removed by the
CR circuit made by the resistance R11 and the capacitor C1.
Similarly, a cut-off-frequency, Which is removed by the CR
circuit made by the resistance R22 and the capacitor C2, is
loWer than the cut-off-frequency, Which is removed by the
CR circuit made by the resistance R21 and the capacitor C2.
45
sponds to a driving amount of the motor 425. Also, a
55
digital-rotational-driving-value V7h along the horiZontal
axis is calculated by subtracting the digital-present-position
value V6h along the horiZontal axis from the digital
rotational-displacement-value V5h. The V7h is a driving
value of the second rotating board 430 from the present
position along the horiZontal axis. Namely, the V7h corre
sponds to a driving amount of the motor 435.
Subsequently, at step S524, the digital-rotational-driving
value V7v along the vertical axis is converted to an analog
For example, as a camera position is almost still during an
driving signal, before outputting the analog driving signal
exposure period, the output voltages of the angular speed
from the ?rst D/A conversion port DA1. Also, the digital
rotational-driving-value V7h along the horiZontal axis is
converted to an analog driving signal, before outputting the
analog driving signal from the second D/A conversion port
sensors 51 and 52 include a relatively loW frequency com
ponent. Under such a situation, the relatively loW frequency
component is not removed by the CR circuit made by the
resistance R12 and the capacitor C1 and the CR circuit made
65
DA2.
US 6,449,432 B1
14
13
The analog driving signal (corresponding to the V711),
detectors, that respectively remove direct-current
components from output signals of said corresponding
tremble detectors, each direct-current-component
output from the ?rst D/A conversion port DA1, is output to
the motor 425, after being ampli?ed by the motor driving
removing system comprising a circuit element having a
predetermined resistance value, a capacitor, and a dif
ference ampli?er that outputs a difference betWeen a
circuit 461. The motor 425 drives the ?rst rotating board 420
based on the analog driving signal. Accordingly, the correc
tion lens 401 is driven along the vertical aXis [3 so that the
vertical aXis component of the focused image tremble due to
?rst input signal, input from a ?rst signal line connected
to said corresponding tremble detector, and a second
the hand tremble can be canceled.
input signal input from a second signal line connected
to said corresponding tremble detector through said
circuit element and said capacitor; and
The analog driving signal (corresponding to the V7h),
output from the second D/A conversion port DA2, is output
to the motor 435, after being ampli?ed by the motor driving
circuit 462. The motor 435 drives the second rotating board
a plurality of tremble-detection initialiZing systems, cor
responding to said plurality of tremble detectors and
430 based on the analog driving signal. Accordingly, the
correction lens 401 is driven along the horiZontal aXis a so
that the horiZontal aXis component of the focused image
15
tremble due to the hand tremble can be canceled.
of said corresponding tremble detectors, Wherein each
tremble-detection initialiZing system short-circuits said
circuit element of said corresponding direct-current
component removing system and connects only said
capacitor in said second signal line of said correspond
At step S526, it is checked Whether the eXposure time,
Which Was calculated at step S508, has elapsed. If the
eXposure time has not elapsed, the process returns to step
S516, the procedures from step S516 through step S524 are
repeated, so that the above-mentioned driving controls of the
ing direct-current-component removing system.
2. The device of claim 1, Wherein each of said direct
motors 425 and 435 are carried out. On the other hand, if it
is con?rmed that the exposure time has elapsed, the process
goes to step S528. At step S528, the shutter device is closed,
the quick return mirror is reset to the doWn position, and the
aperture device is driven to the fully open position, then the
25
current-component removing systems further comprises a
cut-off frequency changing system that changes a frequency
of a frequency component removed from the output signal.
3. The device of claim 2, Wherein each of said direct
photographing operation is ended.
current-component removing systems includes:
As described above, according to this embodiment, imme
diately after the electric poWer is supplied to the camera 1,
the resistance of each of the CR direct-current-component
cut circuits is short-circuited, and the output voltages of the
angular speed sensors are charged in the capacitors C1 and
C2. Accordingly, in the difference ampli?ers for removing
the direct-current-component included in the output voltages
of the angular speed sensors, the inversion-input-terminal
connected to the angular speed and the non-inversion-input
said plurality of direct-current-component removing
systems, that respectively initialiZe said output signals
a ?rst resistance that is connectable betWeen said corre
sponding tremble detector and said capacitor; and
a second resistance, having a resistance value Which is
greater than that of said ?rst resistance, that is connect
able betWeen said corresponding tremble detector and
said capacitor;
35
terminal connected to the capacitor are equipotential, so that
the output of the difference ampli?ers is initialiZed. Namely,
Wherein each of said tremble-detection initialiZing sys
tems includes a ?rst sWitch system by Which said
corresponding tremble detector and said capacitor are
connected in series; and
Wherein said cut-off-frequency changing system includes:
the effect can be obtained, Which is equal to the effect that
a second sWitch system that connects said ?rst resis
the null voltage is removed from the output of the angular
speed sensors in an instant. Accordingly, immediately after
the electric poWer is supplied to the camera 1, the photo
graphing operation can be started With the focused image
tance betWeen said corresponding tremble detector
and said capacitor; and
a third sWitch system that connects said second resis
tance betWeen said corresponding tremble detector
tremble correction Which has a high accuracy.
As described above, according to the present invention, in
a device for correcting the focused image tremble, the
4. The device of claim 3, Wherein in said second signal
line, said ?rst resistance and said capacitor are connected in
tremble correction having a high accuracy is started imme
diately after the operation of the device is started.
The present disclosure relates to subject matter contained
in Japanese Patent Application No. P11-185355 (?led on
series;
said second resistance and said capacitor are connected in
series;
Jun. 30, 1999) Which is eXpressly incorporated herein, by
reference, in its entirety.
What is claimed is:
1. A device for correcting a tremble of a focused image
comprising:
a plurality of tremble detectors that detect a tremble of an
optical aXis of an optical device;
a correction optical system that corrects the tremble;
a plurality of driving devices that drive said correction
optical system;
a controlling system that controls said driving devices
such that said correction optical system is driven in
order to cancel a focused image tremble of an object
due to the tremble of said optical aXis;
a plurality of direct-current-component removing
systems, corresponding to said plurality of tremble
and said capacitor.
45
55
said ?rst sWitch system, said second sWitch system and
said ?rst resistance, and said third sWitch system and
said second resistance are connected in parallel; and
Wherein When said ?rst sWitch system is closed and said
second sWitch system and said third sWitch system are
opened, said output signal is initialiZed by said differ
ence ampli?er.
5. The device of claim 4, Wherein immediately after an
electric poWer is supplied to said optical device, only said
?rst sWitch system is closed.
6. A device for correcting a tremble of a focused image
comprising:
a plurality of tremble detectors that detect a tremble of an
optical aXis of an optical device;
a correction optical system that corrects said tremble;
driving devices that drive said correction optical system;
US 6,449,432 B1
15
16
a controlling system that controls said driving devices
such that said correction optical system is driven in
removing system controllers that respectively initialiZe
said output signals of corresponding tremble detectors,
order to cancel a focused image tremble of an object
each of said removing system controllers short
circuiting said circuit element and connecting said
capacitor in said second signal line of said correspond
due to said tremble of said optical axis; and
difference ampli?ers that respectively output a difference
betWeen an input signal input from a ?rst signal line
ing direct-component-removing system.
that is connected to a corresponding tremble detector of
said tremble detectors and an input signal input from a
8. The device of claim 7, Wherein each of said direct
second signal line that is connected to said correspond
ing tremble detector through a circuit element and a
10
capacitor; and
9. The camera of claim 8, Wherein each of said direct
Wherein When said circuit element is short-circuited and
current-component removing systems further comprises:
said capacitor and said corresponding tremble detector
are connected in series, an output signal of said corre
sponding tremble detector is initialiZed by a corre
15
sponding difference ampli?er of said difference ampli
?ers.
7. Acamera Which is provided With a device for correcting
a tremble of a focused image of an object comprising:
Wherein each of said removing system controllers com
tremble detectors that detect a tremble of an optical aXis
of said photographing optical system;
a correction optical system that corrects the tremble of
25
recting device so as to be included in said photograph
resistance betWeen said corresponding tremble detector
and said capacitor, and a third sWitch system that
connects said second resistance betWeen said corre
sponding tremble detector and said capacitor.
a tremble correction controlling system that controls said
driving devices to enable cancellation of a focused
image tremble of the object due to the tremble of the
10. The camera of claim 9, Wherein in said second signal
line, said ?rst resistance and said capacitor are connected in
series;
35
direct-current-component removing systems that respec
tively output signals obtained by removing direct
current-components from output signals of correspond
detector through said circuit element and said capaci
tor; and
said second resistance and said capacitor are connected in
series;
said ?rst sWitch system, said second sWitch system and
said ?rst resistance, and said third sWitch system and
said second resistance are connected in parallel; and
Wherein immediately after an electric poWer is supplied to
said camera, only said ?rst sWitch system is closed;
ing tremble detectors, each of said direct-current
component removing systems comprising a circuit
element having a predetermined resistance value, a
capacitor, and a difference ampli?er that outputs a
difference betWeen a ?rst input signal, input from a ?rst
signal line connected to a corresponding tremble
detector, and a second input signal, input from a second
signal line connected to said corresponding tremble
prises a ?rst sWitch system by Which said correspond
ing tremble detector and said capacitor are connected in
series; and
Wherein said cut-off-frequency changing system com
prises a second sWitch system that connects said ?rst
ing optical system;
driving devices that drive said correction optical system;
a photographing controlling system that controls an image
capturing operation to record an image of the object;
optical aXis;
a ?rst resistance, having a ?rst resistance value, that is
connectable betWeen said corresponding tremble detec
tor and said capacitor; and
a second resistance, having a second resistance value
greater than the ?rst resistance value of said ?rst
resistance, that is connectable betWeen said corre
sponding tremble detector and said capacitor;
a photographing optical system;
said optical axis, being provided for said tremble cor
current-component removing systems further comprises a
cut-off frequency changing system that changes a frequency
of a frequency component removed from the output signal.
during a photometry operation, only second sWitch sys
tem is closed; and
45
While said image capturing operation is carried out, only
third sWitch system is closed.
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