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Functions and Operations
TM/TMC-4200CL Series Progressive Scan Cameras
6.4 Electronic Shutter
The TM-4200CL has a substrate drain-type shutter mechanism which provides a superb picture at
various speeds.
6.4.1 Preset Shutter
TABLE 4. Electronic Preset Shutter
6.4.2 Programmable Exposure-Continuous Mode
The exposure time of TM-4200CL can be specified from one video line to a maximum of one frame
using the serial communication commands in the Continuous Mode. There is overhead where the
specified exposure time is n video lines, making the real exposure time equal to
When n=0, the exposure time is the minimum exposure time. It is equal to:
In this mode the maximum exposure time is equal to the setting for one frame. If the user specified
exposure time is longer than the time allowed for one frame, it will be ignored by the camera.
6.4.3 Asynchronous No Shutter Mode
In Asynchronous No Shutter Mode, applying the external trigger starts a camera scan reset. The camera
finishes the line it is scanning and scans an additional 9 video lines, this charge is sent to the horizontal
register.
Because the external trigger is randomly applied, the new image charge may overlap with the previous
image. To prevent an existing charge accumulation from interfering with a new image, most users set up
Shutter
Speed
Dual Tap Single Tap
Continuous
Mode (sec)
Async Mode
(sec)
Continuous
Mode (sec)
Async Mode
(sec)
0 No shutter No shutter No shutter No shutter
1 1/60 1/16000 1/35 1/9000
2 1/125 1/8000 1/70 1/4500
3 1/250 1/4000 1/140 1/2250
4 1/500 1/2000 1/280 1/1120
5 1/1000 1/1000 1/560 1/560
6 1/2000 1/500 1/1120 1/280
7 1/4000 1/250 1/2250 1/140
8 1/8000 1/125 1/4500 1/70
9 1/16000 PWC 1/9000 PWC
Exposure Time=
{
(n+1) *32.5 μs+25.6μs
(n+1) *58.1 μs+25.6μs
Dual Tap
Single Tap
Minimum Exposure Time=
{
58.1 μs (1/17000s)
83.7 μs (1/12000s)
Dual Tap
Single Tap