Light guide, light source device, and image reading device

  • US 10,162,096 B2
  • Filed: 03/14/2018
  • Issued: 12/25/2018
  • Est. Priority Date: 12/20/2012
  • Status: Active Grant
First Claim
Patent Images

1. An image reading device, comprising:

  • a light guide assembly including 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, another light guide extending in the long axis direction and having an end in the long axis direction from which light enters the another light guide, an imaging optical system, and a housing retaining the light guide, the another light guide, and the imaging optical system, whereinthe light guide comprisesa first exit face having a first curved surface having a convex cross section perpendicular to the long axis direction, and emitting first exiting light,a second exit face having a second curved surface having a convex cross section perpendicular to the long axis direction, being connected to the first exit face 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 face disposed in a plane face facing the first exit face, anda second reflecting face disposed in a plane face facing the second exit face, the second reflecting face having an area smaller than an area of the first reflecting face,the another light guide comprisesa third exit face having a third curved surface having a convex cross section perpendicular to the long axis direction, and emitting third exiting light, anda third reflecting face disposed in a plane face facing the third exit face, whereinthe second exiting light and the third exiting light irradiate an area of the object different than an area irradiated by the first exiting light, andthe imaging optical system focuses scattered light from the object, the scattered light including the second exiting light and the third exiting light upon being reflected on the object.

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