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. 16, 2021
Filed:
Jul. 24, 2019
Hochiki Corporation, Tokyo, JP;
Tomohiko Shimadzu, Tokyo, JP;
Hochiki Corporation, Tokyo, JP;
Abstract
A detection unit that detects smoke contained in a gas by radiating detection light toward a detection space for detecting smoke, and an inner labyrinth for inhibiting ambient light from entering the detection space, the inner labyrinth being provided to cover an outer edge of the detection space are included, the detection unit includes a light emitting unit that radiates the detection light and a light receiving unit that receives the detection light radiated by the light emitting unit, and at least a part of a side surface of the inner labyrinth on a side of the detection space is formed in a flat shape capable of inhibiting the detection light reflected by the inner labyrinth from entering a field of view RV of the light receiving unit in the detection space.