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:
Oct. 05, 2004
Filed:
Oct. 29, 2002
Martin Pfister, Jona, CH;
David Siegwart, Mannedorf, CH;
Siemens Building Technologies AG, Zurich, CH;
Abstract
A passive infrared detector has a first sensor ( ) for generating an infrared signal, representative of the difference in temperature between a heat source and the background environment of the detector, a second sensor ( ), influenced by the ambient temperature in the detector, and an evaluation circuit ( ) for processing the infrared signal. The evaluation circuit contains a temperature compensation ( ) for influencing the sensitivity of the detector as a function of the ambient temperature. The temperature compensation ( ) is designed in such a way that the sensitivity of the detector is not directly influenced by changes in the ambient temperature. Influencing of the sensitivity of the detector takes place with delay and/or as a function of the speed of the change in the ambient temperature.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile