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:
Nov. 17, 1992
Filed:
Aug. 20, 1990
Robert H Melino, Webster, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
Output copy quality in a ROS electrophotographic printer is maintained by a method and apparatus designed to selectively vary the beam intensity level of a laser beam scan in response to changed conditions within the scanning or xerographic output subsystems. A test pattern video data input is periodically applied to a laser creating an exposure of the test pattern at the photoreceptor. The resulting print has a plurality of horizontal bands with each band associated with a specific beam intensity correction signal. The test pattern band which appears to provide optimum density is identified. The corresponding digital beam intensity correction signal in the ESS memory is enabled and replaces the previous beam intensity signal controlling the laseer output level.