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:
Jul. 08, 2008
Filed:
Jul. 02, 2007
Nobuyuki Tochigi, Utsunomiya, JP;
Takeyoshi Saiga, Utsunomiya, JP;
Tadao Hayashide, Utsunomiya, JP;
Kazuyuki Kondo, Saitama, JP;
Nobuyuki Tochigi, Utsunomiya, JP;
Takeyoshi Saiga, Utsunomiya, JP;
Tadao Hayashide, Utsunomiya, JP;
Kazuyuki Kondo, Saitama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Obtained are an imaging optical system having a simple structure in which imaging position deviation due to deformation caused by a weight of an off-axial optical element is reduced and an image reading apparatus using the same. According to an imaging optical system for image reading, image information on an original surface is imaged on a sensor, and is read by the sensor. The imaging optical system includes reflection-type off-axial optical elements, each of which has an outer shape whose lengths in directions orthogonal to each other are different from each other and whose thickness is smaller than a length of the outer shape in a short-direction thereof and is made of a resin material. The plurality of off-axial optical elements are disposed such that mirror surfaces thereof are opposed to each other and constructed to satisfy a conditional expression.