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Color image forming apparatus and color misregistration correction method therefor

A color image and image technology, which is applied in the field of color image forming apparatus and color misregistration correction for the same, can solve the problem of inability to detect black patterns and the like

Active Publication Date: 2012-01-25
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, when, for example, black is used for the reference color to detect the sensor output using the beam provided for black as a BD signal, and a pseudo BD signal is used for other colors as described above, it cannot be detected even with diffuse reflection light black pattern

Method used

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  • Color image forming apparatus and color misregistration correction method therefor
  • Color image forming apparatus and color misregistration correction method therefor
  • Color image forming apparatus and color misregistration correction method therefor

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Embodiment Construction

[0027] Various exemplary embodiments, features, and aspects of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] A first exemplary embodiment will be described below. figure 1 is a diagram showing a color image forming apparatus 100 connected to a host computer 202 . The color image forming apparatus according to the present exemplary embodiment includes a four-color image forming unit for forming images in which a plurality of colors (yellow: Y, magenta: M, cyan: C, black: B) Color image for image overlay. Although a four-color image forming apparatus is described below, the present invention is applicable to a known color image forming apparatus that uses a plurality of different colors such as six colors.

[0029] The image forming apparatus 100 includes process cartridges 207-210 having photosensitive drums 301-304, respectively, and a scanner unit 205 having a laser diode for generating a laser beam as a light ...

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Abstract

The present invention discloses a color image forming apparatus and a color misregistration correction method thereof. The color image forming apparatus causes a light emitting unit to emit light to a superimposed pattern in which a black developer (Bk) is superimposed on a color developer (Y, M, C) as a background color, detects diffuse reflected light by a light receiving unit, calculates positional deviation among the colors using the black developer (Bk) as a reference color based on a detection result, and adjusts an image forming condition.

Description

technical field [0001] The present invention relates to an arrangement for correcting misregistration (color misregistration) between individual colors in an electrophotographic color image forming apparatus. Background technique [0002] Conventionally, a color image forming device is designed with separate image carriers so that images of all colors are superimposed without any deviation. However, misregistration adjustment is necessary because it is very difficult to completely eliminate variances in parts and variances created during assembly. A known example of such an adjustment method is to form a pattern for detecting misregistration, detect the position of the formed pattern, and correct the amount of deviation, as discussed in Japanese Patent Application Laid-Open No. 2002-023445. [0003] In Japanese Patent Application Laid-Open No. 2002-023445, black is used as a reference color, and a pattern detection unit for detecting a pattern is configured to receive a spe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/50G03G15/01G03G15/00
CPCG03G15/0142G03G15/0194G03G15/0266G03G15/50G03G2215/0119
Inventor 桥本朋浩
Owner CANON KK