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. 04, 1986
Filed:
May. 12, 1983
Applicant:
Inventors:
Kimio Tatsuno, Kokubunji, JP;
Keiji Kataoka, Kawagoe, JP;
Yoshifumi Homma, Hitachi, JP;
Yoshifumi Ono, Katsuta, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
350-68 ; 350412 ;
Abstract
An optical scanning system wherein a light beam from a laser source is reflected by a rotating polygonal mirror and focused by a scanning lens into a scanning beam spot on the drum surface. A cylindrical lens disposed between the scanning lens and the drum for correcting the unevenness of the scanning line pitch caused by the incline of the each facet of the polygonal mirror has a curvature in the scanning direction of the beam so that optimal focal points of the scanning beam spot align on a straight line.