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Image forming apparatus

An image and equipment technology, applied in the field of image forming equipment, can solve the problems of distance change and inability to ensure high-precision detection, and achieve the effect of free layout design and reduction of abnormal noise

Inactive Publication Date: 2011-01-12
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to perform these image density and color deviation corrections with high precision, it is first necessary to stabilize the detection accuracy of the toner image. However, due to the vibration of the belt itself, the mechanical accuracy of the belt driving part, etc. When the distance to the toner image on the belt varies and high-precision detection cannot be ensured

Method used

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  • Image forming apparatus
  • Image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The image forming apparatus of Embodiment 1 such as figure 1 Shown includes a light reflective sensor 3, contact means, and control means.

[0064] The reflective sensor 3 is arranged in parallel with a light-emitting element and a light-receiving element as is well known, is positioned close to and above the driven roller 1 of the intermediate transfer belt 2 , and is disposed downward with the optical axis of the sensor perpendicular to the belt surface. This photoreflective sensor 3 is electrically connected to a control device described later, and detects a test image (formed of a toner image) being conveyed by the intermediate transfer belt 2 . Furthermore, this test image is used to judge image density and color deviation, and includes a scribed line and a coated surface as known.

[0065] The contact device includes a contact member 4 and a telescoping mechanism.

[0066] The contact member 4 is formed in a plate shape having a width capable of projecting a req...

Embodiment 2

[0080] The image forming apparatus of Embodiment 2 exemplarily shows another form different from the contact device exemplarily shown in Embodiment 1, omitting the light reflective sensor 3 having the same structure as that of Embodiment 1, and the control A description of the device.

[0081] The contact device of embodiment 2 is as Figure 4 Shown, have contact member 4, rotating roller 13, and telescopic mechanism.

[0082] The contact member 4 is in a plate shape having a width capable of projecting a required length from both edges of the intermediate transfer belt 2, a required length (length in the belt conveying direction), and a required height, and the contact member 4 An upper edge portion of the side formed to be in contact with the intermediate transfer belt 2 is beveled to be a gentle slope. Further, the contact member 4 is pivotally supported by a pivot shaft 14 protruding from the center portions of both lateral sides in the width direction of the contact mem...

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PUM

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Abstract

An image forming device can restrain frictional loss, shortened life-span of zones, and the occurrence of abnormal sound and so on, and can eliminate the error of detection accuracy caused by the zone vibration, to detect a test pattern for image density and color bias correction. The image forming device includes: an optical reflective sensor (3), for detecting a test pattern containing toner image in the transmission of an intermediate transfer zone (2), wherein, sensor light axis is downwards vertical to the zone plane; a tabular contact component (4), opposite to the optical reflective sensor (3), clipping an intermediate transfer zone (2) therebetween, and capable of performing a fore-and-aft movement relative to the intermediate transfer zone (2); a controller, which can forward thecontact component (4) when the optical reflective sensor (3) detects the test pattern, and press in the mounting direction of the zone direction optical reflective sensor (3), to perform detection ina state with fixed distance from the optical reflective sensor (3) to the test pattern, and which can release the press to the contact component (4) after the detection terminates.

Description

technical field [0001] The present invention relates to an electrophotographic image forming apparatus such as a copying machine, a printer, a facsimile machine, etc., and more particularly, to detecting the state of a toner image on a photosensitive belt and an intermediate transfer belt and performing image processing. Improvements in density adjustment and color deviation correction techniques. Background technique [0002] Among electrophotographic image forming apparatuses including a photosensitive belt and an intermediate transfer belt, there is an image forming apparatus equipped with technical means for correcting image density and color deviation (in the case of an image forming apparatus capable of outputting color images). [0003] Such a technical means is usually equipped with a light reflective sensor that detects the toner image (test image) on the belt, and corrects the amount of image density based on the detection signal amount when the toner image is dete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/00H04N1/50H04N1/00
Inventor 藤森仰太长谷川真平山裕士田中加余子富田健太郎石桥均竹内信贵吉田晃
Owner RICOH KK