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:
Sep. 15, 1987
Filed:
Mar. 20, 1985
Kabushiki Kaisha Tokai Rika Denki Seisakusho, Niwa, JP;
Abstract
A rear view mirror assembly comprising a liquid crystal cell of guest-host type which consists of a layer of dichroic dyestuff added nematic liquid crystal and a pair of transparent plates sandwiching the liquid crystal therebetween. A transparent electrode is formed on the inside surface of each plate by means of conductive coating. A quarter wave phase difference filter is mounted on the backside of one of the plates. A flat mirror is mounted on the backside of the quarter wave phase difference filter. A photo-sensitive means receives light passing through the liquid crystal cell and an optical polarization filter in turn and produces a photo-detector signal. A control circuit controls voltage applied to the electrodes of liquid crystal cell so that the magnitude of photo-detector signal may become equal to the predetermined level. The predetermined level is changeable in accordance with the magnitude of detector signal produced by another photo-sensitive means for detecting circumjacent light.