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:
Jan. 21, 1992
Filed:
Dec. 24, 1990
Lothar Blomberg, Neuenrade, DE;
Asea Brown Boveri Aktiengesellschaft, Mannheim, DE;
Abstract
A passive infrared motion indicator installed at a distance above the ground includes a housing having at least one housing recess formed therein. A Fresnel lens system is disposed in the at least one housing recess. At least one infrared sensor disposed inside the housing has Fresnel lenses onto which frontally arriving first infrared rays with a horizontal main ray are directed from a first detection area and deflected onto the infrared sensor and Fresnel lenses onto which laterally arriving second infrared rays with a horizontal main ray are directed from a second detection area and reflected onto the infrared sensor. At least one deviation mirror surface is tilted above the horizontal main rays of the first and second infrared rays for intermediately deflecting third infrared rays arriving from a third detection area disposed below the passive infrared motion indicator between the ground and the first and second detection areas, onto the infrared sensor.