- 专利标题: IMAGING OPTICAL SYSTEM AND IMAGE READING APPARATUS USING THE SAME
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申请号: US11772457申请日: 2007-07-02
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公开(公告)号: US20080013141A1公开(公告)日: 2008-01-17
- 发明人: Nobuyuki Tochigi , Takeyoshi Saiga , Tadao Hayashide , Kazuyuki Kondo
- 申请人: Nobuyuki Tochigi , Takeyoshi Saiga , Tadao Hayashide , Kazuyuki Kondo
- 申请人地址: JP Tokyo
- 专利权人: CANON KABUSHIKI KAISHA
- 当前专利权人: CANON KABUSHIKI KAISHA
- 当前专利权人地址: JP Tokyo
- 优先权: JP2005-029298 20050204
- 主分类号: G02B26/10
- IPC分类号: G02B26/10
摘要:
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.