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:
Mar. 07, 2000
Filed:
May. 15, 1992
Tomohiro Hashimoto, Kawasaki, JP;
Yasuo Ito, Yokosuka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image processing apparatus includes an input device which inputs a digital input signal expressing a gradation, and a timing signal generator generates a predetermined timing signal. A delay device delays the timing signal in accordance with the gradation expressed by the digital input signal, and a pulse width modulation signal generator generates a pulse width generation signal having a pulse width in accordance with the gradation of the digital input signal, based upon the signal delayed by the delay device. An intermediate gradation is expressed by controlling on the ON/OFF time of a laser beam without the need for offset and gain adjustments which are characteristics of an analog circuit. In a first mode, one dot is formed in correspondence with one pixel of the digital input signal, and in a second mode one dot is formed in correspondence with a plurality of pixels of the digital input signal.