Image reading apparatus and image forming apparatus

Abstract

The present invention is to provide an image reading apparatus reading image information of an original while moving the original on an original base plate comprising: a transport rotary member provided opposite the original base plate to transport the original; a supporting member that supports the transport rotary member to be rotatable; and a gap forming section provided in the supporting member to form a gap between the transport rotary member and the original base plate, wherein the transport rotary member and the supporting member each have a high reflectance surface condition.

Description

technical field [0001] The present invention relates to an image reading device for reading an image of a paper-like document such as a scanner, copier, printer, or facsimile device, and an image forming device having the same. Background technique [0002] Conventionally, in image reading devices installed in digital copiers, printers, facsimile machines, etc., in order to automatically supply original documents as paper to the image reading devices, there is an example of an automatic paper transport device that can be freely opened and closed. Automatic document feeding device (ADF: Auto Document Feeder). [0003] One of the reading methods of the image reading device having the automatic document feeder includes the following reading method, that is, with respect to the document automatically fed by the automatic document feeder, the motor is used to set the document on the automatic document feeder. After the reading unit below moves to the set position and stops, ligh...

AI Technical Summary

Problems solved by technology

Therefore, the amount of light decreases when the platen glass 404 rises from the bent portion, and the readable area having a brightness level suitable for reading becomes an extremely narrow range. When the reading position α deviates from the readable area , which may degrade the image quality

[0012] In addition, in Figure 9 In the structure shown, the document P is transported by bringing the original P into close contact with the platen roller 406 as the transport rotating member. Although the document P can be further pressed against the platen glass 404 and transported, it is necessary to reduce the size of the device. In the case of the curvature of the platen roller 406, as the reading position β deviates from the center of the platen roller 406, a reduction in the amount of light due to the departure of the original P from the platen glass 404 occurs, so that a brightness level suitable for reading cannot be maintained.

As a result, the readable area is limited to the vicinity of the center of the platen roller. Similar to the guide member 405, if the reading position β deviates from the readable area, image quality may deteriorate.

Images