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:
Dec. 30, 1997
Filed:
May. 30, 1996
Hiroyuki Tomooka, Otsu, JP;
Tadashi Sugimoto, Otsu, JP;
Optex Co., Ltd., Shiga, JP;
Abstract
A passive-type infrared sensor system includes first and second sensor units each including a first or second light receiving element and a first or second optical system. The first sensor unit has a 'viewing' direction oriented towards an upper half of a human body so as to define a first watch area clear of a ground surface. The second sensor unit has a similar 'viewing' direction oriented diagonally downwardly towards a point on the ground surface spaced a predetermined watch distance away from where it is installed so as to define a second predetermined watch area below the first watch area. This passive-type infrared sensor system also includes first and second level detecting circuits each operable to output a detection signal only when the level of an electric output signal from the associated first or second sensor unit exceeds a predetermined reference level, and a human detecting circuit for outputting, when the detection signals are outputted respectively from the first and second level detecting circuits, a human detection signal indicative of entry of a human body within a monitoring zone including the first and second watch areas.