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Title:
READING DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/042348
Kind Code:
A1
Abstract:
[Problem] In a reading device equipped with an illumination device having a light guide, to ensure that light from the light guide cannot directly enter an image pickup device. [Solution] In cross-section as seen from the longitudinal direction of light guides (8, 9), the outside lines defining the curved emission faces (8d, 9d) thereof are asymmetrically formed as continuations of the respective arcs, in which the arc radius on the side of a reflecting mirror (14) is made smaller than the arc radius on the opposite side. Thus, although there is a risk that stray light emitted from the light guides when the emission face thereof is for example a cylindrical lens might be reflected at the reflecting mirror (14), any such light coming towards the reflecting mirror from the emission face of a light guide avoids the reflecting mirror. This is because such light is more strongly refracted, since the radius of the emission face on the side of the reflecting mirror is smaller. Hence it is possible to prevent image glare produced by entry of such reflected light into the camera.

Inventors:
SANADA TAKAFUMI
TSUCHIHASHI NOBUHIRO
KAWANO YUUZOU
Application Number:
PCT/JP2012/005927
Publication Date:
March 28, 2013
Filing Date:
September 17, 2012
Export Citation:
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Assignee:
PANASONIC CORP (JP)
International Classes:
F21V8/00; F21V5/02; F21V5/04; H04N1/04; F21Y101/02
Foreign References:
JPH05199367A1993-08-06
US20100195168A12010-08-05
US20100238666A12010-09-23
US20090010020A12009-01-08
Attorney, Agent or Firm:
OSHIMA & PARTNERS (JP)
Patent business corporation Oshima patent firm (JP)
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