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3.2.3
Power and External Sync Connector
Refer to Table 2 on page 6 for information on the power and external sync. connectors.
3.3
Progressive Scanning
Standard TV-system scanning is 525 lines interlace scanning as specified in the RS-170 protocol. Every other
horizontal line (odd lines and even lines) is scanned at a 60Hz rate per field, and the scanning is completed
with two fields (one frame) at 30Hz rate. Because of the interlace scanning, the vertical resolution of CCD
cameras is limited at 350 TV lines, regardless of the horizontal resolution. When electronic shutter is applied,
the CCD can hold only one field of charge at each exposure. Therefore, the vertical resolution of the
electronic-shutter camera is only 244 TV lines. The situation is the same for an HDTV-format camera, since it
has interlaced scanning and the vertical resolution of the shuttered image is 500 lines.
The TM-1402 uses a state-of-the-art progressive scanning interline transfer CCD which scans all lines
sequentially from top to bottom at one frame rate (30Hz). Like a non-interlace computer screen, it generates a
stable, crisp image without alternating lines and provides full vertical TV resolution of 1040 lines (a normal TV
monitor display may not be able to show images due to monitor scanning).
The interline transfer architecture is also important to generate simultaneous shuttering. This is different from
full frame transfer architecture which requires a mechanical shutter or strobe light in order to freeze the
object motion.
The TM-1402 outputs the progressive scan image with an electronic shutter in two different formats:
•
Progressive scanning digital and analog output
The CCD signal goes through A/D and D/A converters and through 10-bit in, 8-bit out look-up table (LUT).
The digital output is available from 31-pin connector with RS-644 format (50MHz clock rate).
The analog output is the same as 75Ω, 1Vp-p format at 30Hz rate available from BNC and 12-pin
connector.
•
Partial scan output (display output)
−
Partial scan: 500 lines at 56 frames per second.
−
Partial scan: 250 lines at 98 frames per second.
Note: Minimal blooming may occur under partial scanning mode due to the nature of the CCD.
3.4
Electronic Shutter
For more information about the electronic shutter, please see Section 1.2 on page 2.
3.5
Asynchronous Reset
For more information about Asynchronous Reset, please see Section 1.2 on page 2.
14
TM/TMC/RM/RMC-1402 Series
Operation
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