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:
Oct. 24, 1978
Filed:
Jan. 06, 1977
Takeshi Goshima, Tokyo, JP;
Fujio Iwatate, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A scanning device for light beams, wherein, for the purpose of permitting positional displacement of a scanning light beam to a certain extent in the direction perpendicular to its scanning direction, which is possibly caused by tilting or inclination of the reflection surfaces of scanning means such as a polygonal mirror, there is disposed a tolerating optical system in the light path of the light beam from the above-mentioned reflection surfaces. The positioned displacement of this light beam caused by tilting of the reflection surfaces of the light beam scanning means can be tolerated by a positional displacement tolerating optical system, wherein the focal length in the direction perpendicular to the scanning direction of the light beam is shortened in comparison with the focal length in the scanning direction of this tolerating optical system.