Patent ID: 8872076
Filing Date: 2014-10-28
Classification: H05B

Abstract:
1. A heating device comprising: a coil that generates magnetic flux by flow of electric current therethrough; a to-be-heated member configured to generate heat by action of the magnetic flux generated by said coil; a first magnetic flux-detecting unit disposed at a location where said first magnetic flux-detecting unit is capable of detecting the magnetic flux generated by said coil assuming that said to-be-heated member does not exist; a second magnetic flux-detecting unit disposed such that at least some area of said second magnetic flux-detecting unit overlaps said first magnetic flux-detecting unit; and a control unit configured to determine whether or not a state of said to-be-heated member has changed, based on a result of detection by said first magnetic flux-detecting unit and a result of detection by said second magnetic flux-detecting unit, wherein said first magnetic flux-detecting unit includes at least one polarity inverting portion as a boundary on opposite sides of which a polarity of output is inverted therebetween, and wherein said second magnetic flux-detecting unit includes a polarity inverting portion as a boundary at which on opposite sides of which a polarity of output is inverted therebetween, provided at a position that is not coincident with a position of said polarity inverting portion of said first magnetic flux-detecting unit.