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:
Mar. 01, 2016
Filed:
Dec. 17, 2014
Canon Kabushiki Kaisha, Tokyo, JP;
Takayuki Sugiyama, Utsunomiya, JP;
Narumasa Ito, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
Provided is an image reading apparatus that can inhibit occurrence of a bright spot line image due to microstructures of a light guide. An image reading apparatus satisfies: 45−φ≦θ≦φ−ω/n (0≦ω≦ω); and 45−φ≦θ≦φ (−ω≦ω≦0), where θ is an angle (deg.) between a surface of original and a reflecting surface of a microstructure reflection surface of a light guide, ω is a half angle of view (deg.) of an imaging forming lens, ω(ω>0) is a maximum value (deg.) of the half angle of view of the imaging forming lens on an LED light source side with respect to a reading optical axis of the imaging lens, −ωis a maximum value (deg.) of the half angle of view of the imaging lens on a side opposite to the LED light source with respect to the reading optical axis, n is a refractive index of the light guide, and φ=sin(1/n).