Area array CCD camera shutter

Abstract

The present invention relates to an area array CCD camera shutter, which comprises a fast disc, a slow disc, code discs, a first motor, a second motor and a control circuit. The fast disc and the slow disc are respectively arranged at one end of the rotating shaft of the first motor and at one end of the rotating shaft of the second motor; code discs are respectively arranged at the other ends of the rotating shafts of the first motor and the second motor are respectively; the fast disc and the slow disc rotate at different speeds; the code discs measure the rotating speeds and phases of the fast disc and the slow disc, and transmit the rotating speeds and phases to the control circuit; the control circuit controls the first motor and the second motor to rotate at the constant rotating speeds according to the signals of the rotating speeds and the phases; sector openings with different sizes are respectively arranged on the fast disc and the slow disc; when the sector openings of the fast disc and the slow disc simultaneously pass through the light path, the CCD is exposed; and when the sector openings of the fast disc and the slow disc do not simultaneously pass through the light path, the CCD can not be exposed, and the charges in the CCD can be eliminated and read.

Description

technical field [0001] The invention relates to a camera shutter, in particular to a shutter that can be used for a space remote sensor area array CCD camera. Background technique [0002] The shutter is an important part of the space area array camera. When using a full-frame area array CCD detector for imaging, it is required to remove the noise charge in the CCD in advance. After the exposure is completed, it is required to allow a period of time to read the charge. During the imaging time interval, the two tasks of reading data and clearing data must be completed, which requires the shutter to not only control the exposure time (that is, the integration time of the CCD) to meet the imaging requirements, but also prevent the CCD from being exposed during the non-imaging time. . [0003] At present, there are mainly two types of shutters used in cameras: central lamination type and curtain type. Taking the curtain type shutter as an example, this kind of shutter has two l...

AI Technical Summary

Problems solved by technology

When the shutter is exposed, the shutter curtain is rewound by the torsion spring in the rewind roller shaft, and the exposure curtain slit formed by the openings of the two shutter curtains passes through the focal plane at the same speed and in the same direction, and the light falls on the focal plane without obstruction , this kind of shutter is driven by springs or electromagnetic components, and its lifespan is only about 50,000 times, which cannot meet the needs of space cameras for high precision and long life (more than 100 million times).

Images