The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 28, 1999
Filed:
May. 29, 1997
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A heater of a fixing unit of a recording apparatus is constructed by a main heater and a sub heater. When the apparatus is in a standby mode, each heater is first turned off. When a temperature of the fixing unit is equal to or lower than a heating start temperature of the sub heater, the sub heater is turned on. After that, when the temperature of the fixing unit reaches a heating stop temperature of the sub heater, the sub heater is turned off. After that, when the temperature of the fixing unit is equal to or lower than the heating start temperature, the main heater is turned on. After that, when it reaches the heating stop temperature of the main heater, the main heater is turned off. The above operations are repeated. In the recording mode, the order of the on/off periods in a control unit time of each heater is switched every period and the temperature control is executed, thereby reducing a flickering.