JAI TM-6740GE, Руководство по эксплуатации

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Page 48
Operation
TM-6740GE 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-6740’s asynchronous pulse-width control mode provides no-delay shutter (Figure 33, “No-Delay
Shutter,” on page 48) 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 33.
No-Delay Shutter
The TM-6740GE 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