JAI PULNiX TM-4100GE, Руководство по эксплуатации

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Page 48
Operation
TM-4100GE Hardware
8.6.3 External VINIT With Pulse Width (No-Delay Shutter) and ROI (Read-out
Inhibit)
For multiple-camera applications such as 2D or 3D measurement and multi-angle inspection,
simultaneous image capturing at an exact shutter timing for all cameras is a critical requirement. The
TM-4100’s asynchronous pulse-width control mode provides no-delay shutter as standard. Regardless
of the internal pulse timing, the camera discharges at the VINIT leading edge and transfers charges at
the trailing edge of the pulse. Even though each camera runs with slightly different H and data clock
timing, the image capturing is exactly simultaneous.
FIGURE 32.
No-Delay Shutter
The TM-4100GE camera also has read-out-inhibit control (ROI) to control the vertical clock start
(Async Shutter #9). When ROI is low, V-clock is stopped and the transferred charges remain in the
vertical shift registers, which work like CCD memory. When the ROI is high, it clocks out the CCD
data. This helps a single frame grabber process multiple images in pipeline processing (sequential
process).
Note: When the ROI function is not used, make sure that the INTEG/ROI CC2 input is kept logic
high during Async. pulse width control mode.
HD
INT. VINIT after trailing edge of EXT. VINIT
Discharge
Transfer Gate
FDV
Analog Video Sync
Exposure time set by pulse width
Vsync
Strobe