JAI operation manual Features, TM-6760 Series Progressive Scan Shutter Cameras, Introduction

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TM-6760 Series Progressive Scan Shutter Cameras

1.2Features

•Miniaturized and lightweight

The printed circuit boards in the TM-6760 have been arranged with a new design philosophy in mind. This creates modular electronics for the camera, giving it flexibility. In addition, the use of miniature solid-state components results in a compact, lightweight camera that is 44mm x 44mm x 64mm in dimensions, and weighs only 138 grams.

•Imager

The TM-6760 uses a progressive scan interline transfer CCD that has the following features:

-Resolution of 648 x 484 active pixels for excellent image quality.

-9.0 x 9.0 µm square pixels for precise dimensional measurement.

-High-speed electronic shutter capability for high dynamic resolution of moving objects and electronic iris control that eliminates the need for a mechanical shutter.

-Progressive scan CCD eliminates interlace deterioration of image and increases ease of computer interface.

-High sensitivity and low noise at fast scanning. The CCD has a clock rate faster than 25 MHz pixel and has an excellent S/N ratio that is greater than 48dB.

-The CCD for the TM-6760 has built-in microlenses.

•Electronic shutter

The TM-6760 has a substrate drain-type shutter mechanism which provides superb pictures at various speeds without smearing. A built-in manual shutter speed control selects the electronic shutter rate of 1/125, (non-async mode only) 1/250, 1/500, 1/1,000, 1/2,000, 1/4,000, 1/8,000, 1/16,000, or 1/32,000 second.

With VINIT high (5V), the CCD keeps discharging. With a negative pulse to VINIT, the camera resets and purges the charge momentarily. Then it starts integrating for the period of shutter control set by either an external pulse width or internal shutter control. Progressive scanning permits a full 484 lines of vertical resolution, as compared to a conventional CCD camera which captures only half the vertical lines per shutter.

•Asynchronous reset

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. There are two modes to control the asynchronous reset and shutter speed:

-External VINIT with pulse width. The duration between pulse edges controls the shutter speed externally.

-Internal shutter control mode. The speed control varies from 1/250 to 1/32,000 sec. The video signal starts with internal V reset timing related to shutter speed.

Introduction