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:
Apr. 06, 1993
Filed:
Jan. 09, 1992
Yukihiko Inagaki, Kyoto, JP;
Yoshihiro Kishida, Kyoto, JP;
Abstract
A light beam scanning system for scanning an object with a light beam emitted from a light source to record or read images includes a lattice plate disposed in a position equivalent to a scanning plane of the light beam and extending in a primary scanning direction. The lattice plate includes a plurality of light transmitting sections each having a width substantially corresponding to a diameter of the light beam in an in-focus position. Photodiodes or the like are provided to detect quantity of the light beam having passed through the light transmitting sections of the lattice plate. Since the detected quantity of the light beam is correlated with focus displacement of the light beam, amounts of focus displacement of the light beam at different points in the primary scanning direction are determined from the detected quantity of the light beam. When recording an image, the quantity of the light beam is adjusted based on the determined amounts of focus displacement to equalize print line widths at different points in the primary scanning direction.