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:
May. 26, 1998
Filed:
Oct. 30, 1996
Applicant:
Inventors:
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
219497 ; 219216 ; 219481 ; 219501 ;
Abstract
A heating control device of an image forming apparatus determines a phase of heat control in accordance with a target temperature and a current temperature of a fixing roller and a change status of the current temperature, determines a control unit period tp, a main heater turn-on time tm, a sub-heater turn-on time ts and Duty No. in accordance with a count of a counter which counts the number of control units which are unit periods of control and a shift status of phase, and finally determines a type of control and supplies powers to the main heater and the sub-heater. A proper heater power to control to a target temperature can be applied in a short period and a temperature ripple is reduced.