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:
Jul. 23, 1996
Filed:
Sep. 28, 1993
Applicant:
Inventors:
Ian McMichael, Port Hueneme, CA (US);
Mohen Khoshnevisan, Newberry Park, CA (US);
Assignee:
Rockwell International Corporation, Troy, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ; G06M / ; G02B / ;
U.S. Cl.
CPC ...
250221 ; 2502 / ; 25022726 ; 25022728 ; 2502082 ;
Abstract
A light curtain having linearly arranged pairs of light transmitting and receiving which may be placed on opposing sides of a zone to be protected. The light curtain provides uniform sensitivity across the region to be protected as the light transmitters emit a light beam which begins as an omnidirectional point source which is truncated and refocused by an optical lense. Predetermined portions of the beam are blocked to assure uniform intensity across the width of the transmitter.