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:
Jan. 04, 2000
Filed:
Jul. 30, 1998
Michael J Martin, Boise, ID (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A fixing device control system controls multiple heating elements included in the fuser so that the duty cycle of the power applied to the multiple heating elements results in an optimal temperature profile over the length of the fuser. Multiple thermistors are used in a feedback control circuit to regulate the temperature profile of the fuser. A formatter uses print data from a host to generate data defining the size and location of a printing area on the print media. Using the data defining the size and location of the printing area, the formatter generates a command to send to a controller. The controller applies power to the multiple heating elements in order to generate the fuser temperature profile corresponding to the command. In a first embodiment of the fixing device control system, the formatter generates the command by using the data defining the size and location of the printing area to access information stored in a table. In a second embodiment of the fixing device control system, the formatter computes the command from the data defining the printing area.