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:
Nov. 19, 1991
Filed:
Jan. 24, 1990
Wade Lee, Alamo, CA (US);
Intelectron, Hayward, CA (US);
Abstract
An improved infrared intrusion detector is provided which conveniently and expeditiously monitors two fields of view by use of a single sensor. In a preferred embodiment, the improved intrusion detector monitors fields of views which are substantially orthogonal in a nonobvious manner. It is nonobvious in that an aperture is provided in a housing which permits radiation from a second field of view to enter the housing. Internal optical elements are provided to direct this incident radiation from the second field of view onto a sensor used for the first field of view. The internal optical elements are protected from the environment and do not give advance warning that a second field of view is monitored. Generally, the second field of view is below the intrusion detector to detect unauthorized activity in a dead zone below the detector.