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. 01, 2001
Filed:
Jul. 02, 1998
Shunichi Komatsu, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A copy machine comprises a fluorescent lamp inverter circuit for supplying a voltage necessary to light on a fluorescent lamp for exposing an original, an inverter control circuit for outputting an inverter drive signal of a first frequency to control the fluorescent lamp inverter circuit, a light modulation control circuit for outputting a light modulation drive signal of a second frequency to control a current flowing in the fluorescent lamp, and a synchronization circuit for synchronizing the inverter drive signal and the light modulation drive signal with each other by using a clock division circuit and a phase-locked loop (PLL) circuit. Thus, unevenness in exposing of the original is eliminated, thereby improving image quality.