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:
Oct. 06, 1998
Filed:
Apr. 09, 1997
Kan Tomita, Tokyo, JP;
Masaharu Furuya, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A control operation for a fixing device which may find application in an image forming apparatus such as a printer, facsimile, or copier machine, etc. The fixing device controls a temperature of a fixing element therein, for example a fixing roller, based on a calculated compensated temperature T' of the fixing roller, which is calculated based on detected temperature of the fixing element T0 and a reference environmental temperature T1 within the image forming apparatus according to the following equations: ##EQU1## in which each of A1-A4, a1-a4, b1-b4 and c1-c4 are constants. Experimental results have indicated that such a compensation temperature value T' closely approximates an actual temperature of the fixing element. Thus, with such an operation, a temperature of a fixing element can be controlled to an appropriate value.