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. 30, 1996
Filed:
Aug. 17, 1993
Masaki Ojima, Yokohama, JP;
Masaharu Ohkubo, Yokohama, JP;
Michio Itoh, Hachiohji, JP;
Hiroshi Sasame, Yokohama, JP;
Hiromichi Yamada, Yokohama, JP;
Tetsuo Saito, Tokyo, JP;
Atsushi Kashihara, Hachiohji, JP;
Takashi Kawana, Yokohama, JP;
Hiroshi Mano, Tokyo, JP;
Kaoru Seto, Chigasaki, JP;
Hiroshi Atobe, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A multivalued input recording signal is subjected to pulse-width modulation at a time unit shorter than the period of a clock signal within the period of the recording signal. Alternatively, the multivalued input recording signal is converted into a plurality of different signals each of whose length of time is shorter than a clock signal within the period of the recording signal, thereby performing pulse-width modulation in accordance with a predetermined weighting. This makes it possible to obtain a highly toned recording signal without raising the frequency of the clock signal. Further, density tone data is generated in dependence upon inputted multivalued pixel data, and control is performed using both the irradiation time and emission intensity of a light beam based on the generated density tone data. An image is formed by irradiating a photosensitive body with the controlled light beam.