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Image forming apparatus with accurate correction of color misalignment

An imaging device and color technology, applied in the electrical recording process using the charge pattern, the equipment of the electric recording process using the charge pattern, and the electrography, can solve the problems of reducing the detection accuracy of the detector and achieve the goal of shortening the processing time Effect

Inactive Publication Date: 2008-07-30
RICOH KK
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, if the optical axis of the light-emitting device and the optical axis of the light-receiving device are misaligned due to the manufacturing deviation of the detector, the influence of the diffuse reflection component contained in the reflected light received by the light-receiving device cannot be ignored, thereby degrading the detector. detection accuracy

Method used

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  • Image forming apparatus with accurate correction of color misalignment
  • Image forming apparatus with accurate correction of color misalignment
  • Image forming apparatus with accurate correction of color misalignment

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Embodiment Construction

[0028] Hereinafter, an embodiment in which the present invention is applied to an image forming apparatus composed of a tandem color laser printer will be described with reference to the accompanying drawings. It should be noted that the image forming apparatuses to which the present invention is applicable are not limited to color laser printers, and the present invention is applicable to various image forming apparatuses using electrostatic printing, such as color copiers and facsimile machines.

[0029] FIG. 7 is a schematic diagram showing a main part of an imaging device according to an embodiment of the present invention. FIG. 1 is a block diagram of main parts as shown in FIG. 7 .

[0030] In FIGS. 1 and 7, the first images (toner images) corresponding to the respective colors (ie, Y: yellow; C: cyan; M: magenta; and K: black) will be formed along the transfer belt 5. The 1st to 4th image processing units 6Y, 6C, 6M, and 6K are arranged in a straight line, and the tran...

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Abstract

An image forming apparatus includes a detection unit configured to cause a light emitting device to emit light, to cause a light receiving device to receive the light reflected by an object, and to produce a detection signal having a varying signal level responsive to an intensity of the received reflected light, a color misalignment correction unit configured to correct color misalignment resulting from positional misalignment between the developer images of respective colors on a transfer body by controlling an exposure unit in response to detected data indicative of the developer images detected in the detection signal, and an adjustment unit configured to identify a plurality of peak positions in the detection signal detected with respect to a single developer image and to adjust the detected data indicative of the developer images detected in the detection signal in response to difference in the peak positions.

Description

technical field [0001] The present invention relates generally to methods and apparatus for forming images using electrostatic printing, and more particularly to image forming methods and apparatus for correcting color misalignment caused by positional misalignment of multiple color developers on a transfer body. Background technique [0002] In various image forming devices such as color copiers and color laser printers, a tandem (tandem-type) image forming device converts toner images corresponding to four developer colors, ie, yellow, cyan, magenta, and black It is sequentially transferred onto a transfer body (for example, transfer belt or transfer paper). With such configurations, tandem imaging devices often run the risk of developing color misalignment caused by mutual positional misalignment of toner images corresponding to the respective colors. Such color misalignment greatly affects the quality of color images generated by fixing the toner images of the respectiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/00
CPCG03G15/011G03G15/04018G03G2215/0158
Inventor 木下泉
Owner RICOH KK
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