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. 05, 2002
Filed:
Nov. 27, 2000
Applicant:
Inventors:
Assignee:
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41J 2/700 ;
U.S. Cl.
CPC ...
B41J 2/700 ;
Abstract
A multi-beam scanner has two light emitting points ch ch and an optical system. The light emitting points ch ch are separated by a distance &Dgr;along a depth-of-focus direction. The longitudinal magnification &agr;, or the image-side numerical aperture NA, of the optical system is set so that the surface to be scanned of a photosensitive drum is positioned within a range where the depths of focus d of the light beams from the two light emitting points ch ch overlap. The multi-beam scanner can focus the light beams onto the surface of the photosensitive drum at all the scanning positions even when the optical system has curvature of field.