Image reading device and sheet handling apparatus

Abstract

An image reading device includes an illuminating means for illuminating a reading position through which a sheet conveyed by conveying means passes, optical reading means for reading reflected light of the sheet illuminated by the illuminating means when the sheet passes the reading position, a white reference plate disposed opposite to the optical reading means with the reading position sandwiched therebetween, and moving structure means for moving a placement position of the illuminating means based on a placement position of the white reference plate, and storage means is included for storing information in a searchable manner.

Description

[0001] Cross References to Related Applications [0002] This application is based on and benefits from prior Japanese Patent Application No. 2011-225078 filed on October 12, 2011, the entire contents of which are hereby incorporated by reference. technical field [0003] The typical embodiments described here relate to an image reading device and a sheet processing device. Background technique [0004] A conventional image reading device includes a transmission path, an illumination device, a camera, and the like. When the sheets conveyed by the conveyance path reach the reading position, the reflected light from the sheets irradiated by the lighting device is focused on the line sensor through the lens of the camera. The line sensor is scanned in a direction perpendicular to the conveyance direction, and reads the reflected light of the sheet in synchronization with the scanning. The read data is converted into a two-dimensional image by the image acquisition unit. [0...

AI Technical Summary

Problems solved by technology

[0008] However, in the conventional image reading device described above, the amount of reflected light (reflection brightness) from the paper varies depending on the distance between the white reference plate and the paper, so the paper is placed on the upper surface of the white reference plate arranged at the reading position. When jumping, the distance between the above-mentioned white reference plate and the paper changes

Therefore, the amount of reflected light from the paper fluctuates, and as an image reading device, it is impossible to obtain an image corresponding to what a human sees.

In addition, as a paper inspection device, there is a problem that high-precision inspection cannot be performed because a stable reflection image cannot be obtained.

In particular, there is a problem that the amount of reflected light from the surface of the paper is different because the degree of influence of the white reference plate is different when the thickness of the paper is thick and when it is thin.

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