TMC-6700 Progressive Scan CCD Digital Color Camera
Asynchronous Reset
The TMC-6700 asynchronous reset operates with internal
sync or external HD for phase locking. When VINIT pulse is
applied, it resets the camera’s scanning and purges the CCD.
There are three modes to control the asynchronous reset
and shutter speed.
1. External VINIT with pulse width control. The pulse width
between two pulse edges controls the shutter speed externally
from 1/32,000 sec. to 4 sec.
2. Internal shutter speed with fast mode. The video signal
has no delay from the reset timing. The shutter speed range is
1/4,000 to 1/32,000 sec.
3. Internal shutter speed with slow mode. The speed control
is variable from 1/60 to 1/3,500 sec. The video signal starts
with internal V reset timing related to shutter speed.
Bayer Primary Color Filter
The TMC-6700 employs a color filter array (CFA) called a
“Bayer CFA” which comprises a ratio of two green pixels to one
red or blue pixel. The color interpolation is implemented by
digital signal processing developed by PULNiX.
Electronic Shutter
The TMC-6700 has a substrate drain shutter mechanism
which provides a superb picture at various speeds without
smearing. Progressive scanning permits 482 lines (2 lines less
than the imager) of full vertical
resolution per single shutter. The
manual shutter-speed control
selects the electronic shutter rate of
1/60 to 1/32,000 sec. The user can
assign any shutter speed to any of
the preset shutter positions. The
factory default values are as
follows:
Shutter Control Switch
The asynchronous shutter is activated by selecting async
reset and the shutter speed. The async reset pulse, VINIT,
must be applied to set up the shutter. With VINIT high (5V), the
CCD keeps discharging. With a negative going pulse to VINIT,
the camera resets and purges the charge momentarily. Then it
starts integrating for the period of shutter control set either by
internal shutter control or external pulse width control. If “0”
shutter is selected in async mode, the camera resets
asynchronously without shutter function; this can be used for
applications requiring strobe lighting.
Integration
The CCD imager of the TMC-6700 can be exposed for
longer than 1 frame timing (1/60 sec.) This feature provides
high sensitivity for low light applications. Integration is
achieved by controlling the #11 pin of the 12-pin connector to
Low (GND). Integration also can be achieved by VINIT pulse
width control of the async shutter up to four seconds.
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