Liquid crystal shutter control circuit for a video camera having

Details Liquid crystal shutter control circuit for a video camera having Liquid crystal shutter control circuit for a video camera having

1995-01-23

1997-04-08

Peng, John K.

Television

Camera, system and detail

Optics

348221, 348371, 396457, H04N 5238

Patent

active

056192665

ABSTRACT:
A liquid crystal shutter, mounted on the side of a lens in a video camera, includes a pair of polarizing filters with a liquid crystal cell between them. A pulse generator generates a pulse for a predetermined length of time that is synchronized with a vertical synchronizing signal of a television signal. A controller controls an electrical field of the liquid crystal shutter to allow light from an object to be transmitted through the liquid crystal shutter in response to the pulse. Such liquid crystal shutter, having no mechanical moving parts, is much more durable than a mechanical shutter and can be easily maintained. In addition, the shutter apparatus, because it is controlled electrically, can work at high speed and can be easily synchronized with other systems.

REFERENCES:
patent: 3577153 (1971-05-01), Yagi
patent: 3881808 (1975-05-01), Gurtler et al.
patent: 3890628 (1975-06-01), Gurtler
patent: 4686572 (1987-08-01), Takatsu
patent: 4734777 (1988-03-01), Okino et al.
patent: 4788565 (1988-11-01), Masuda et al.
patent: 4803550 (1989-02-01), Yabe et al.
patent: 4837628 (1989-06-01), Sasaki
"New LC/CRT field-sequential color display", R.S. Vatne and P.A. Johnson Jr. and P.J. Bos, Proceedings of the SID, vol. 25/1, 1984, pp. 31-34.

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