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. 27, 1998
Filed:
May. 31, 1995
Alice M d'Entremont, Boston, MA (US);
Canon, Inc., Tokyo, JP;
Abstract
A system for providing gray scale modulation signals to the drive circuit of a laser printer having a source of printer video timing signals, a printer video drive circuit, a memory for storing a raster bit map that can be read out in accordance with the timing signals, and a source of flag signals. The system includes another memory for storing a plurality of multibit bytes each encoding a corresponding gray scale value, and an address generator for relating the timing of the operation of the system to the timing of operation of said raster bit map memory. A Modulator is included for converting the gray scale values to a stream of pulse-width-modulated signals. A logic switch is included and is responsive to each flag signal for selectively feeding either the stream of pulse-width-modulated signals or the raster bit map to the drive circuit.