VCC-5CL4M
Rev.905-0060-04
©2016 CIS Corporation. All rights reserved.
21
7.11.
Pulse Width Trigger Shutter Mode
□
This is the mode to start exposure with external input trigger signals, and set the exposure time with pulse width of
the trigger signals.
□
Trigger operation is H sync., and V-sync. restart system.
The delay time (Exposure Time Delay
①
) from
detecting trigger edge in the camera to starting exposure is 2H~3H.
The delay time (Exposure Time Delay
②
) from
detecting trigger edge in the camera to end exposure is
2H+13.73μs~3H+13.73μs.
□
Since the external trigger signals sync. with camera internal H signals, 1H jitter occurs to Exposure Time Delay
①
and
②
. In case of pulse width trigger mode, jitters may occur at the both start and end edges of exposure.
At this time, exposure time would change so that flicker might be noticeable in the image, especially when high
speed shutter is set. This flicker sometimes can be eliminated when fixed trigger shutter mode is used. However,
this problem can be solved by inputting a trigger pulse with synchronizing it to the camera internal H cycle (LVAL).
□
Pulse width is min. 1H to approx. 2 frames. Functionally, there is no upper limitation, but noises such as dark
noises
shadings may be noticeable at long time exposure.
□
There is an exposure time period for approx. 13.73μs at the edge right after exposure output.
□
Trigger input during exposure time shall be ignored in the camera. However, a trigger shorter than 1 frame cycle
shall not be used.
□
Triggers can be accepted while outputting video output images. However, please be noted that a trigger signal to
start the next video outputting before completion of outputting the prior images should not be input. (Refer to (A)
in
the drawing below).
