The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 08, 1997
Filed:
Jan. 23, 1995
Seijiro Tomita, Tokyo, JP;
Takashige Nabeshima, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Sony/Tektronix Corporation, Tokyo, JP;
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.