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. 26, 1982
Filed:
Jan. 14, 1980
Kazuo Minoura, Yokohama, JP;
Kazuhiro Hirayama, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention provides a laser scanning apparatus for modulating a laser beam with a modulator into plural independent modulated beams and scanning a plane with the plural beams. In order to prevent a change of the intensity of each beam spot on the scanned plane depending on the exit angle of the beam from the laser, there is provided a converging lens of a focal length f1 between the laser and modulator in such a manner, when the distance from the beam exit of the laser to the converging lens is selected equal to f1+.DELTA.S and the distance from the lens to the modulating point of the modulator is selected approximately equal to f1, as to satisfy the following relation: