Title:
A transparent material, a lighting installation for picture reading, and an image reader
Document Type and Number:
Japanese Patent JP6007361
Kind Code:
B2
Abstract:
A light guide for use in an image reading apparatus. The light guide extends in a predetermined direction. The light guide comprises an emitting surface, through which light rays entering the light guide are emitted, and a reflecting surface configured to reflect the light rays to the emitting surface. A cross-sectional surface of the light guide, which is a sectional surface of the light guide along a plane orthogonal to the predetermined direction in which the light guide extends, has a shape including a combination of an ellipse and a parabola. The parabola on the cross-sectional surface of the light guide defines the reflecting surface. A focal point of the parabola is located on a first focal point of the ellipse that is closer to the reflecting surface.
Inventors:
Akira Yamamura
Masahiko Tanaka
Masahiko Tanaka
Application Number:
JP2014004825A
Publication Date:
October 12, 2016
Filing Date:
January 15, 2014
Export Citation:
Assignee:
Konica Minolta Co., Ltd.
International Classes:
H04N1/028; F21S2/00; G03B27/54; G06T1/00; H04N1/04
Domestic Patent References:
| JP2006014081A | ||||
| JP2007080637A | ||||
| JP2011249020A | ||||
| JP2005117602A | ||||
| JP2011044336A |
Foreign References:
| WO2005001529A1 |
Attorney, Agent or Firm:
Ken Takada