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:
Jun. 20, 1989
Filed:
Oct. 19, 1987
Jack L Biersdorff, Los Altos, CA (US);
C & K Systems, Inc., San Jose, CA (US);
Abstract
In the present invention, an infrared intrusion detection system is disclosed. The infrared intruder detector is typically mounted at a vertical height from a ground plane. The detector has a fresnel lens which has a plurality of lines of focus for focusing infrared radiation received by the detection system through the fresnel lens. A detector in the detection system is located at the focal point for receiving infrared radiation through the fresnel lens. A curvilinearly-shaped mirror is placed apart from the detector in the direction away from the detection plane for receiving infrared radiation from the detection plane and the reflecting and focusing the detected infrared radiation onto the detector.