Image reading apparatus
AssigneeCanon Components, Inc.
InventorHidemasa Yoshida
Life of this patent
Estimating the term…
Abstract
A transmission light source unit includes a first light source portion including: a first light source; and a first light guide that shapes light emitted by the first light source into a line and emits the light toward a conveyance path of a paper sheet. An image sensor unit includes: a second light source portion that emits light toward the conveyance path of the paper sheet; and an image sensor that detects the light emitted by the first light source portion and transmitted through the paper sheet and the light emitted by the second light source portion and reflected by the paper sheet. A first light diffusing surface of the first light guide is provided with at least one of concave portions and convex portions including inclined surfaces and inclined relative to a normal line of the first light emission surface.
Claims5
An image reading apparatus comprising a transmission light source unit and an image sensor unit arranged to face each other across a conveyance path of a paper sheet,
- the transmission light source unit comprising a first light source portion comprising:
- a light source;
- and a light guide that emits light emitted by the light source toward the conveyance path of the paper sheet,
- the image sensor unit comprising:
- a second light source portion that emits light toward the conveyance path of the paper sheet;
- and an image sensor that detects the light emitted by the first light source portion and transmitted through the paper sheet and the light emitted by the second light source portion and reflected by the paper sheet,
- the light guide comprising:
- a light emission surface that emits light toward the conveyance path of the paper sheet;
- and a light diffusing surface that is provided on an opposite side of the light emission surface and that diffuses the light emitted by the light source, wherein
- the light diffusing surface is provided with at least one of concave portions and convex portions including inclined surfaces inclined relative to a normal line of the light emission surface.
Dependencies are inferred from the claim text.