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. 22, 2002
Filed:
Feb. 06, 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 , such as a lens defining a detection area B, mounted on the carrier body A, a light projecting element for projecting a disturbance detecting beam L from inside of the incident side enclosure towards the incident side enclosure , a light receiving element for receiving the disturbance detecting beam L reflected from the incident side enclosure , and a detecting circuit for detecting a presence or absence of the obstacle on the incident side enclosure , based on an amount of light received by the light receiving element . A multiplicity of projections are formed on an outer surface of the incident side enclosure so as to define a multiplicity of gaps between the obstacle and the outer surface of the incident side enclosure , when the obstacle is applied to the outer surface of the incident side enclosure