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:
Jul. 17, 1990
Filed:
Sep. 26, 1988
Yukio Tsuda, Musashino, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A laser printer comprises two reference clock generators to define the rotational speed of a polygon mirror (main scanning rotational mirror); namely, a first reference clock generator which generates a clock signal whose frequency is set so as to correspond to a scanning line density for a millimeter system, and a second reference clock generator for generating a clock signal whose frequency is set so as to correspond to a scanning line density for an inch system. One of these clock generators is selected in accordance with the scanning line density of received image data. As the rotational speed of the polygon mirror decreases, a decrease and an increase in the image data density occur in the directions of main- and sub-scan, respectively, whereas as the rotational speed of the polygon mirror increases, an increase and a decrease in the image data density occur in the directions of main- and sub-scan, respectively.