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:
Mar. 10, 1987
Filed:
Feb. 05, 1985
Kazuomi Ota, Anjo, JP;
Minoru Kato, Ichinomiya, JP;
Seiichi Narita, Kariya, JP;
Mitutoshi Moriya, Gamagori, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
In a smoke sensing apparatus, a light receiving circuit including a light receiving element senses light emitted from a light emitting circuit including a light emitting element and scattered by smoke, and a voltage holding circuit converts the output signal of the light receiving circuit into a d.c. voltage and holds the d.c. voltage. A mean value circuit averages the voltage signal from the voltage holding circuit, and a switching circuit acts to bring the output of the mean value circuit to a level close to that of the output of the voltage holding circuit. A comparison circuit compares the output of the means value circuit with the output of the voltage holding circuit thereby generating a control signal.