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:
Aug. 28, 2012
Filed:
May. 01, 2007
Yoshifumi Watabe, Tondabayashi, JP;
Yoshiaki Honda, Seika-cho, JP;
Tomizo Terasawa, Suita, JP;
Yuji Takada, Kyoto, JP;
Takayuki Nishikawa, Osaka, JP;
Yoshifumi Watabe, Tondabayashi, JP;
Yoshiaki Honda, Seika-cho, JP;
Tomizo Terasawa, Suita, JP;
Yuji Takada, Kyoto, JP;
Takayuki Nishikawa, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The present invention provides a smoke sensor of sound wave type that excels in responsiveness and has a low probability of false detection. The smoke sensor has a sound wave generating unit that provides an ultrasound wave to a monitoring space, a sound wave receiving unit that receives the ultrasound wave from the sound wave generating unit via the monitoring space, and a signal processing unit that detects an abnormality of the monitoring space by using an output of the sound wave receiving unit. The signal processing unit includes a smoke density estimation unit that estimates a smoke density in the monitoring space on the basis of a difference between the output of the sound wave receiving unit and a standard value, and a smoke density determination unit that determines the abnormality of the monitoring space by comparing the smoke density estimated by the smoke density estimation unit with a predetermined threshold.