Light guide, light source device, and image reading device

  • US 9,946,009 B2
  • Filed: 08/30/2016
  • Issued: 04/17/2018
  • Est. Priority Date: 12/20/2012
  • Status: Active Grant
First Claim
Patent Images

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 to the first exit portion 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;

    a first reflecting portion disposed in a first plane portion facing the first exit portion;

    a second reflecting portion disposed in a second plane portion facing the second exit portion; and

    at least one recess of;

    a recess extending in the long axis direction and disposed between the first exit portion and the second reflecting portion; and

    a recess extending in the long axis direction and disposed between the second exit portion and the first reflecting portion,the at least one recess being formed by planes extending in the long axis direction and intersecting each other,the at least one recess being formed by a plane parallel to an optical axis of the first exiting light and by a plane intersecting the plane parallel to the optical axis of the first exiting light.

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