Image reading apparatus and image reading system

Abstract

The invention provides an image reading apparatus and an image reading system. The apparatus includes: a light source opposite to one surface of a medium; a backing member opposite to another surface of the medium and including a backing surface opposite to the another surface of the medium; an imaging unit opposite to the one surface of the medium and at a position different from the light source in a conveyance direction, and to pick up an image of the medium and the backing surface on which a shadow of the medium is formed due to light from the light source; and a processor to generate image data including the image of the medium and the backing surface based on a result by the imaging unit, wherein the backing surface is inclined with respect to the conveyance direction, and a gap between the path and the backing surface decreases from a light source side toward an imaging unit side.

Description

technical field [0001] The present invention relates to an image reading device and an image reading system. Background technique [0002] Conventionally, for image reading apparatuses and the like, techniques for detecting edges of sheet-like media have been proposed. For example, detecting edges enables detection of the size of the medium. [0003] As a technique for detecting edges, for example, Japanese Laid-Open Patent Application No. 09-65061 discloses a method by providing a reflective surface having the same reflectance as the original as the background of the original reading portion, and detecting an edge formed on the reflective surface. A technology that detects the skew of the original by using the shadow of the original. [0004] However, when the edge of a sheet-like medium is to be detected from its shadow, the shade of the medium varies depending on, for example, the thickness of the medium, and edge detection accuracy may drop depending on the kind or thi...

AI Technical Summary

Problems solved by technology

[0004] However, when the edge of a sheet medium is to be detected based on the shadow of the medium, the shade of the medium varies depending on, for example, the thickness of the medium, and the accuracy of edge detection may drop depending on the kind or thickness of the medium to be detected.

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