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. 28, 2004
Filed:
Mar. 26, 2002
Rico Sonderegger, Lengwil, CH;
Optrel AG, Wattwil, CH;
Abstract
A glare-protection device contains an active filtering element ( ) with influenceable light transmission such as a liquid crystal cell. The glare-protection device also contains an electronic circuit ( ) for evaluating the output signal of a light sensor ( ) and for driving of the filtering element ( ), which electronic circuit ( ) is attached to the internal surface ( ) of a printed circuit board ( ). The electronic circuit ( ) has an evaluation circuit ( ) and a driving circuit ( ). A screening element ( ), which is made out of electrically conductive material, is provided to screen at least a part of the evaluation circuit ( ) against electro-magnetic radiation originating from the driving circuit ( ), and is affixed to the same internal surface ( ). Thanks to the screening element ( ), the evaluation circuit ( ) can be designed to be exceedingly sensitive, without it being excessively interfered with by electromagnetic influences. The screening element ( ) keeps both interfering electro-magnetic influences, which emanate from the surroundings ( ) of the glare-protection device as well as other influences that are produced in the glare-protection device itself, away from the evaluation circuit ( ).