Heater having heat generating resistors
AssigneeCanon Kabushiki Kaisha
InventorsKazunori Masuda, Hiroshi Kondo
Life of this patent
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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.
Claims12
A heater apparatus comprising:
- an electrically insulative base plate;
- a plurality of independent resistors, extending along a length of said base plate, for producing heat upon electric energization thereof;
- a temperature detecting element for detecting a temperature of said plate;
- control means for controlling a supply of electric power to said plurality of independent resistors so that the temperature detected by said detecting element approaches a predetermined temperature;
- and
- selecting means for selecting at least one of said resistors to be energized and for changing a resultant resistance of the selected at least one resistor in accordance with an output of said detecting element.
A heater apparatus comprising:
- an electrically insulative and thermally conductive base plate;
- a plurality of independent resistors, extending along a length of one side of said base plate, for producing heat upon electric energization thereof;
- and
- temperature detecting elements corresponding to said resistors, respectively, wherein said detecting elements are disposed substantially opposite from said resistors, respectively, with said base plate therebetween.
Dependencies are inferred from the claim text.