Image reading device and image forming apparatus

Abstract

The invention provides an image reading device and an image forming apparatus. If a special sensor for detecting the height of the central portion of a book document is not used, a black belt-like image density generated by reading image data from the book can be suppressed. The image reading device includes a document table, an image reading portion, a cover member, a reading control portion, a document determination portion, and a density correction portion. The cover member is openable and closable with respect to a document table, and has a color reference surface facing the document table, and a partial region provided on a color reference surface facing the document table and having a predetermined density different from a density of the color reference surface. When a document is determined to be a book document, the density correction portion corrects a density in a specific density correction range at a central portion in document image data read from a document by an image reading portion, based on a second density difference which is a density difference between a density of the color reference surface read by a reading control portion when a book document is placed on a document placement surface, and a density of the color reference surface read by the image reading portion when the cover member is closed.

Description

Technical field [0001] The present invention relates to an image reading device and an image forming device that read image data from a manuscript placed on a manuscript table. Background technique [0002] An image reading device generally known to the general public reads image data from the original by receiving the reflected light with a photoelectric conversion element such as a CCD when the original placed on the original table is irradiated with light from below. When using this image reading device to read image data from a document with a certain thickness (hereinafter referred to as "book manuscript") such as a book with multiple sheets of paper in the center (hereinafter referred to as "book manuscript"), the center of the book manuscript and the manuscript table There is a gap between. Therefore, the amount of reflected light from the central part of the book manuscript is reduced, and in the image data read by the image reading device, a black band-shaped image appe...

AI Technical Summary

Problems solved by technology

[0003] However, in the aforementioned technique, since a special sensor for detecting the height of the central part of the book original placed on the original table is newly installed, there is a problem that the number of parts and the cost increase.

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