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:
Mar. 04, 2003
Filed:
Feb. 09, 2001
Hiroyuki Tomooka, Otsu, JP;
Optex Co., Ltd., Shiga, JP;
Abstract
A security sensor having a disturbance detecting capability capable of detecting the presence of an obstacle purposefully applied to the sensor in an attempt to fool or tamper the sensor includes a carrier body A having an infrared sensor element an incident side enclosure mounted on the carrier body A, a light projecting element for projecting a disturbance detecting beam L a light receiving element for receiving disturbance detecting beam L first and second light guide members operatively associated with the light projecting element and the light receiving element respectively, said first and second light guide members being cooperative with each other to define an optical path L along and adjacent an outer surface of the incident side enclosure or an outer surface of the carrier body A adjacent the incident side enclosure a detecting circuit for detecting a presence or absence of an obstacle, applied to at least one of the first and second light guide members based on an amount of light received by the light receiving element Surface irregularities are formed on a light transmitting surface or or a light reflecting surface or of the light guide members and