TMC-1000 Progressive Scan CCD Digital Color Camera
Asynchronous Reset
The TMC-1000 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 1/16,000 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 1/2,000 to 1/16,000 sec.
3. Internal shutter speed with slow mode. The speed
control is variable from 1/15 to 1/1,750 sec. The video
signal starts with internal V reset timing related to shutter
speed.
Bayer Primary Color Filter
The TMC-1000 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-1000 has a substrate drain shutter mechanism
which provides a superb picture at various speeds without
smearing. Progressive scanning permits 1016 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 1/15 to
1/16,000 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-1000 can be exposed for
longer than 1 frame timing (1/15 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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