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. 14, 2003
Filed:
Jun. 29, 2000
Takeshi Yamawaki, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A scanning optical device to be used for an image forming apparatus such as a laser beam printer and a digital copying machine comprises a light source such as a semiconductor laser, an optical deflector having a deflection surface for deflecting the light beam emitted from the light source in the main-scanning direction, a first optical system for causing the light beam emitted from the light source to strike the deflection surface as a linear image extending in the main-scanning direction, and a second optical system for focussing the light beam deflected by the optical deflector on a surface to be scanned. The first optical system comprises a first lens, a second lens and a cylindrical lens showing refractive power only in the sub-scanning direction, preferably as well as part of the second optical system shared with the latter. The second lens and/or the cylindrical lens are movable along the optical axis to regulate the imaging position of the light beam on the surface to be scanned.