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:
Apr. 14, 1998
Filed:
Nov. 06, 1995
Applicant:
Inventors:
Koji Tsutsumi, Kobe, JP;
Takashi Wada, Kobe, JP;
Assignee:
NABCO Limited, Kobe, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
250221 ; 340555 ;
Abstract
A light-emitter emits light, and a plano-convex condenser lens focuses the emitted light and projects the focused light onto a floor near a door to thereby establish a sensing area. A plano-convex light-receiving lens focuses light reflected from the sensing area, and a light-receiver receives the focused, reflected light. The plano-convex lenses have edges closer to the door which is substantially straight.