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. 16, 1979
Filed:
Oct. 27, 1977
Kuniharu Tatetsuki, Sakai, JP;
Tohru Hanahara, Hirakata, JP;
Takeshi Nakano, Ibaraki, JP;
Kazushige Morisue, Owariasahi, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
A detection signal processing circuit for photoelectric smoke detectors reliably stable with respect to external noise is provided. Light receiving section of the detector for receiving light emitted intermittently from light emitting section and scattered by smoke particles comprises a light receiving element, a condenser charged depending on intermittent scattered light intensity received by the element and of a value over a predetermined level, and an output circuit providing an output to a following operation means only when charge amount of the condenser has reached a predetermined value. Optimumly, the predetermined value of the condenser charge is achieved when at least two or more of the intermittent scattered light are received continuously.