Page 18
TM-6760 Series Progressive Scan Shutter Cameras
3.5 Integration
The CCD imager of the TM-6760 can be exposed for longer than the normal scan timing of 1/60 sec. This integration feature provides extra sensitivity for dark-environment applications. The progressive- scan imager permits a full frame of resolution in non-interlace format. Integration is achieved by applying INTEG signal to pin #11 of the 12-pin connector or pin #6 of the 31-pin connector, or by feeding VINIT pulse width control up to 1 sec at the pulse width. Please refer to Figure 2.2.2 on page 6 for pin-out information on the 12-pin connector.
The CCD imager of the TM-6760 can be exposed for longer than the normal scan timing of 1/60 sec. This integration feature provides extra sensitivity for dark-environment applications. The progressive scan imager permits a full frame of resolution in non-interlace format. Integration is achieved by applying INTEG signal to pin #11 of the 12-pin connector or pin #6 of the 31-pin connector, or by feeding VINIT pulse width control up to 1 sec at the pulse width.
3.6 Asynchronous Reset
ASYNC RESET
VINIT
VD
SG (TRANSFER GATE)
DISCHARGE PULSE
PROGRESSIVE OUTPUT
VIDEO
Stand-by Image | Shutter Video | Stand-by Image |
The TM-6760's asynchronous reset is flexible and accepts external horizontal drive (HD) for phase locking. When the VINIT pulse is applied, it resets the camera's scanning and purging of the CCD. For asynchronous image capturing by framegrabbers, it outputs single FDV at async reset. There are two modes to control the asynchronous reset and shutter speed:
•External VINIT with Pulse Width (no delay shutter)
•Internal Shutter Speed Mode
3.6.1External VINIT With Pulse Width (No-Delay Shutter)
The TM-6760 can be reset with external reset pulse (VINIT). Set the dial switch to “9”. Apply a pulse- width control VINIT signal generated from an external event trigger to the camera. The TM-6760’s asynchronous pulse width control mode provides no-delay shutter as standard. Regardless of internal pulse timing, it discharges at VINIT’s 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, image capturing is perfectly simultaneous.
For the progressive format, one frame of video output will start from the rising edge of the pulse width control. In async mode with external pulse input high, the video output will be disabled as the camera continues discharging the CCD image, providing black video only.