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:
Jun. 09, 2015
Filed:
Nov. 30, 2009
Kenji Watanabe, Hyogo, JP;
Takahiro Miyauchi, Hyogo, JP;
Tomoya Fujinami, Shiga, JP;
Hiroshi Tominaga, Hyogo, JP;
Kenji Watanabe, Hyogo, JP;
Takahiro Miyauchi, Hyogo, JP;
Tomoya Fujinami, Shiga, JP;
Hiroshi Tominaga, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The present invention provides an induction heating cooker, which is structured to cut off visible light being incident upon an infrared sensor, yet being capable of more accurately sensing any abnormality of the infrared sensor before heating is started. To this end, the induction heating cooker includes a sensor failure sensing-purpose light emitting portion that emits visible light for sensing any failure of an infrared sensor, a visible light cutting filter provided on a surface of a printed circuit board holding the infrared sensor so as to cover the field of view of the infrared sensor, and a control unit that limits the output of an inverter circuit supplying a high-frequency current to a heating coil when the output of the infrared sensor is equal to or less than a threshold value in a situation where the sensor failure sensing-purpose light emitting portion is lit up. The infrared sensor receives the visible light from the sensor failure sensing-purpose light emitting portion to irradiate inside the visible light cutting filter.