Heater having heat generating resistors

Electric heating – Heating devices – With heating unit structure

Patent

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Details

219216, 219486, 355285, 338308, H05B 300

Patent

active

053767730

ABSTRACT:
A heater apparatus includes an electrically insulative base plate and a plurality of independent resistors, extending along a length of the base plate, for producing heat upon electric energization thereof. A temperature detecting element detects a temperature of the base plate, and a controller controls a supply of electric power to the plurality of independent resistors so that the temperature detected by the detecting element approaches a predetermined temperature. A selecting device selects at least one of the resistors to be energized to change a resultant resistance of the selected resistors in accordance with an output of the detecting element.

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patent: 5177341 (1993-01-01), Balderson

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