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:
May. 03, 1988
Filed:
Apr. 25, 1986
Yuichi Kawakami, Nishinomiya, JP;
Hakuzo Tani, Takatsuki, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
A flame detector in which an infrared ray sensor having a specific infrared ray sensitivity and a visible ray sensor having a specific visible ray sensitivity are provided and output signals from both sensors are amplified by amplifiers, which in turn provide output signals to a phase discriminator circuit, the output signal from the amplifier for the infrared sensor output being also fed to a rectifier circuit for rectifying only a predetermined level or higher portion of the amplified output; an output signal from the rectifier circuit is fed to an integrator circuit and also fed to another integrator circuit through a switch which is opened when the output level of the phase discriminator circuit is 'H'; then output signals from the integrator circuits are compared by a comparator and at the same time the output signal from said another integrator circuit is compared with a preset value by a comparator; and output signals from both comparators are fed to a control circuit which issues an alarm when the output levels of both comparators are 'H'.