VCC-GC20V41CL

VCC-GC20V41CL Rev.900-721-34

8.2.3 Pulse Width Trigger Shutter Mode

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This is the mode to start exposure with external input trigger signals, and set the exposure time with

pulse width of the trigger signals.

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Trigger operation is CLK Sync. HV-Sync Reset. The delay time (Exposure Time Delay) from detecting

trigger edge in the camera to starting exposure is approx. 330ns. And, the delay time from detecting

trigger end edge to completing exposure is approx. 270ns.

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Pulse width is min. 1HD to approx. 2 frames. Functionally, there is no upper limitation, but noises

such as dark noises and shadings may be noticeable at long time exposure.

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Triggers can be accepted even when outputting video signals. However, trigger signals for exposure to start the next video output prior to the completion of video transmission for the prior video output signals cannot be accepted.

If the edge part of trigger signals is overlapped with video outputting period, 1 line noise may be detected on the video output screen. To input trigger signals during video output period, set the data

003 to the address 014 (Trigger input signal, camera internal H sync ON). External trigger signals are synchronized with camera internal H signals so that max. 1HD jitter to Exposure Time delay would occur.

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When changing the camera to pulse width trigger shutter mode, the first output image can be unstable.

Please input the first trigger as a dummy to ignore and take the second and after as the actual triggers.

Trigger Input

480 H

Video Output

Exposure Time

LVAL Output

DVAL Output

FVAL Output

Trigger Input

Exposure Time

1

Delay(Fixed)

330ns

2 H

2 3 4

10 H

11 12 13 14

1 2

・ ・ ・ ・ ・

・ ・ ・ ・ ・

・ ・ ・ ・ ・

480 H

Delay(Fixed)

270ns

481 482

479 480

Exposure Time

※

Video output signal delays by 2H from Exposure Time.

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