CIS VCC-5CL4MHS, Техническое описание и руководство по эксплуатации

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VCC-5CL4MHS Rev.905-0079-01
©2017 CIS Corporation. All rights reserved.
15
7.5. 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
＋
13.73
μ
s
～
3H
＋
13.73
μ
s.
□
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. 13.73
μ
s 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).
Effective Line : 2048H
Effective Line
～ ～
Exposure Out
2
0
4
8
1
TRIG IN
LVAL Out
FVAL Out
Video Out
DVAL Out
～ ～
2
0
4
8
1
Effective Line
Trigger input ignore period
Exposure Time
Exposure Time Delay
①
Exposure Time Delay
②
(A)
TRIG IN
Exposure Out
(SP Out)
Exposure time delay
① ②