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:
Jun. 23, 1987
Filed:
Oct. 30, 1984
Masamichi Tateoka, Yokohama, JP;
Toshinori Ando, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The scanning optical system of this invention has a light source, a first focussing optical system linearly focussing a light beam coming from the light source, a deflector having its deflecting-reflection surface in the vicinity of the focussing image, and a second focussing optical system for focussing the light beam deflected by the deflector on a medium to be scanned. The second focussing optical system has a spherical single lens having negative refractive power, a spherical single lens having positive refractive power and a single lens having a toric surface. By this arrangement, a focussing spot having a small diameter in the main scanning direction and having a well compensated curvature of field and distortion can be formed on the medium to be scanned.