Light guide, light source device, and image reading device

  • US 9,841,549 B2
  • Filed: 12/13/2013
  • Issued: 12/12/2017
  • Est. Priority Date: 12/20/2012
  • Status: Active Grant
First Claim
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1. A light guide extending in a long axis direction and having an end in the long axis direction from which light enters the light guide, the light guide comprising:

  • a first exit portion having a first curved surface having a convex cross section perpendicular to the long axis direction, and emitting first exiting light;

    a second exit portion having a second curved surface having a convex cross section perpendicular to the long axis direction, being connected through a connection portion to the first exit portion to form a concave shape in a direction perpendicular to the long axis direction, and emitting second exiting light in a direction different from a direction of the first exiting light; and

    a common reflecting portion to reflect the light entering the light guide to each of the first exit portion and the second exit portion, whereinthe common reflecting portion is disposed, in a bottom portion facing both of the first exit portion and the second exit portion, to be entirely shifted in a first direction in the direction perpendicular to the long axis direction from a position where a normal to the bottom portion passes through the connection portion and intersects the bottom portion,the connection portion connects the first exit portion and the second exit portion to form the concave shape, andall portions of the bottom portion, beginning from the position where the normal intersects the bottom portion and extending to an end of the bottom portion in a second direction opposite to the first direction, guide the light entering the light guide in a manner different from the common reflecting portion.

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