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. 11, 2023
Filed:
Sep. 26, 2020
Hochiki Corporation, Shinagawa-ku, JP;
Manabu Dohi, Shinagawa-ku, JP;
Tomohiko Shimadzu, Shinagawa-ku, JP;
Keisuke Washizu, Shinagawa-ku, JP;
Hochiki Corporation, Tokyo, JP;
Abstract
A fire detection apparatusincludes a first light emitting unitthat irradiates a detection space located inside or outside the fire detection apparatuswith first detection light, a second light emitting unitthat irradiates the detection space with second detection light having a different wavelength from a wavelength of the first detection light, a light receiving unitthat receives scattered light of the first detection light irradiated from the first light emitting unitdue to smoke, outputs a first light receiving signal according to the received scattered light, receives scattered light of the second detection light irradiated from the second light emitting unitwith respect to smoke, and outputs a second light receiving signal according to the received scattered light, and an identification unitthat identifies a type of smoke present in the detection space on the basis of an output ratio of an output value of the first light receiving signal to an output value of the second light receiving signal output from the light receiving unitand a rising rate of the output value of the first light receiving signal or the second light receiving signal.