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:
May. 17, 1994
Filed:
May. 10, 1993
Yukio Nagase, Kawasaki, JP;
Yuji Sakemi, Yokohama, JP;
Akira Watanabe, Yokohama, JP;
Masahiro Itoh, Sagamihara, JP;
Kenichi Takeda, Yokohama, JP;
Kazuhisa Kemmochi, Machida, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus wherein a laser beam produced by a laser source is imaged through an imaging optical system on an image bearing member as a beam spot. The beam spot scans the image bearing member in a main scan direction. The laser source is rendered on and off to form an image with picture elements. The laser driving pulse width per picture element is changed in accordance with the image density of the image to be formed, so that the tone gradation of the image is provided on the image bearing member in accordance with the pulse width. The size of the spot measured in the main scan direction (1/e.sup.2 diameter) is not more than 0.7 times of the size of the picture element measured in the main scan direction.