Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1981-05-29
1984-01-17
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219 1055B, 219497, 374 9, H05B 102
Patent
active
044265727
ABSTRACT:
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 illuminating 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.
REFERENCES:
patent: 3371268 (1968-02-01), Knudsen
patent: 4180722 (1979-12-01), Clewans
patent: 4213023 (1980-07-01), Satoh et al.
patent: 4238672 (1980-12-01), Siess
patent: 4245148 (1981-01-01), Gisske et al.
patent: 4363957 (1982-12-01), Tachikawa et al.
Ishihara Masahiro
Tachikawa Hajime
Hitachi Heating Appliances Co., Ltd.
Paschall M. H.
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