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:
May. 21, 1991
Filed:
Oct. 25, 1989
Applicant:
Inventor:
Ali R Mousavi, San Jose, CA (US);
Assignee:
C & K Systems, Inc., Folsom, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01T / ;
U.S. Cl.
CPC ...
250353 ; 250342 ;
Abstract
A 360.degree. pattern field of view optical system for passive infrared detection device is disclosed. The optical system uses a combination of a fresnel lens and a fresnel prism to gather infrared radiation, focus the radiation, and refract radiation onto a focal point. Each of the combination of fresnel lens and prism is positioned substantially circumferentially about a central location to gather the infrared radiation from a 360.degree. field of view and for focusing radiation gathered onto the central location. At the central location, a sensor is located. The sensor converts the focused infrared radiation into an electrical signal.