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:
Sep. 05, 1989
Filed:
Aug. 04, 1987
Tetsuo Saito, Kawasaki, JP;
Akihiko Takeuchi, Yokohama, JP;
Iichiro Yamamoto, Shiki, JP;
Motoi Kato, Yokohama, JP;
Yukihiro Ohzeki, Yokohama, JP;
Takahiro Inoue, Yokohama, JP;
Hiroshi Sasame, Yokohama, JP;
Hisashi Fukushima, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
There is disclosed an apparatus for obtaining image signal by tonal processing of an input signal. Pulse-width modulation of the input signal is achieved thorugh comparison with a second signal of a predetermined shaped, for example a triangular signal. In order to avoid the influence of fluctuating factors in pulse-width modulation, the apparatus also has a third signal generator, and the pulse-width modulated signal or a pattern signal generated by the third signal generator is selectively used for image formation.