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. 14, 2000
Filed:
May. 26, 1999
Applicant:
Inventor:
Kazuo Fujibayashi, Kawasaki, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359689 ; 2502018 ; 359740 ;
Abstract
In an image reading apparatus, an original is illuminated and an image of image information on the original surface is formed on a surface of a line sensor by an imaging system. The imaging system includes a zoom lens each element of which is so constructed as to obtain a predetermined effective F-number on a side of the line sensor of the zoom lens independently of zooming. The zoom lens has an aperture stop the diameter of which is adapted to change in synchronism with zooming to obtain a predetermined effective F-number on the side of the line sensor.