Heating apparatus with char detecting and heating control unit

F - Mech Eng,Light,Heat,Weapons – 24 – C

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309/69.3

F24C 7/08 (2006.01) G05D 23/27 (2006.01)

Patent

CA 1152139

ABSTRACT OF THE DISCLOSURE A heating apparatus in which an object to be heated placed in its heating chamber can be heated until the surface of the object is charred as desired by the user. A first photo sensor senses the intensity of light of visible spectrum range directed toward and reflected from the surface of the object being heated, and a second photo sensor senses the light intensity related to the light reflected from the surface of the object, that is, at least one of the intensity of illuminating light emitted from a light source and the intensity of illuminat- ing light coming from the exterior of the heating chamber. The degree of charring of the surface of the object is judged on the basis of the output signals from the first and second photo sensors, and the heating operation is controlled on the basis of the result of judgement.

377787

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