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:
Apr. 11, 2017
Filed:
Feb. 28, 2013
Panasonic Corporation, Osaka, JP;
Kenichi Irie, Osaka, JP;
Masashi Kawada, Shizuoka, JP;
Satoshi Hyodo, Hyogo, JP;
Hiroshi Kohara, Osaka, JP;
Abstract
A metal detection device includes a metal detection coil arranged in a metal detection area, wherein the metal detection coil is excited, and an electromagnetic wave radiated from the metal detection coil detects whether metal exists in the metal detection area. An oscillation circuit generates a sinusoidal oscillating current having a single fundamental frequency and supplies the oscillating current to the metal detection coil to excite the coil. A harmonic level detection circuit detects a harmonic component of the fundamental frequency component of the oscillating current and generates a detection signal. A comparison circuit compares a signal level of the detection signal and a pre-set reference value. A processing circuit determines whether metal exists in the metal detection area based on a comparison result. When determining that metal exists in the metal detection area, the processing circuit drives a notification unit to issue a notification indicating detection of metal.