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:
Nov. 25, 2003
Filed:
Feb. 14, 2002
Yukio Ogura, Tokyo, JP;
NEC Corporation, , JP;
Abstract
Laser scanning optics for scanning a laser beam issuing from a laser in the main scanning direction while repeatedly steering it in the subscanning direction is disclosed. The laser scanning optics includes focusing optics for focusing the laser beam, a first deflector for steering the laser beam in the subscanning direction, and a second deflector for steering the laser beam in the main scanning direction. The focusing optics causes the laser beam to form an elliptical beam spot, which is elongate in the main scanning direction, in a scanning plane. The first deflector is driven such that the laser beam is scanned at a higher speed in the subscanning direction than in the main scanning direction. The first deflector is so controlled, based on a value input beforehand or data measured beforehand, as to correct the distortion of linearity in the main scanning direction by subscanning.