Color copying machine
AssigneeCanon Kabushiki Kaisha
InventorKoji Suzuki
Life of this patent
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Abstract
A color copying machine of the invention has a halogen lamp for emitting light to an original, a photosensitive drum on a surface of which is formed an electrostatic latent image by the light reflected from the original, a transfer section which color-separates the image and transfers it on a paper sheet, a potentiometer probe which detects the surface potential of the photosensitive drum, a microcomputer which makes the measured surface potential to converge to a reference value determined for each color, and a fine tuning board for allowing fine control of the converged value. A copy image of excellent color balance is obtained over a long period of time irrespective of degradation in the units of the machine or variations in the quality of toners. A particular color of the copy image may be emphasized or deemphasized as desired.
Claims21
A color image forming apparatus comprising:
- image forming means for forming a color image on a recording medium;
- control means for controlling said image forming means to form a plurality of different density patterns on said recording medium;
- and
- detecting means for sequentially detecting the value of a surface condition of said recording medium in accordance with said density patterns;
- storage means for storing the values of the surface condition of said recording medium which are detected by said detecting means;
- display means for displaying the values of the surface condition stored in said storage means;
- and
- selecting means for manually selecting any one of the values of the surface condition to be displayed on said display means in accordance with said plurality of different density patterns.
A color image forming apparatus comprising:
- image forming means for forming a color image on a recording medium;
- detecting means for detecting the value of a surface condition of said recording medium;
- and
- controlling means for controlling the value of the surface condition for each color in response to a detection signal from said detecting means,
- wherein said detecting means detects the value of the surface condition of a sample area formed on said recording medium with a common sample for each color, and said control means controls said image forming means in accordance with the detection signal from said detecting means and a different control parameter for each color for varying an operation condition of said image forming means for each color to regulate an image forming condition for each color.
A color image forming apparatus comprising:
- image forming means for forming a color image on a recording medium;
- determining means for determining the respective color data concerning a control of said image forming means before a color image formation, upon varying an operation condition of said image forming means for each color, to regulate an image forming condition of said image forming means for each color;
- storage means for storing, during the color image formation, the data for plural colors obtained from said determining means;
- and
- control means for controlling said image forming means to form the color image on the recording medium in accordance with the data for each other stored in said storage means after the control data for all of the plural colors are determined by said determining means.
A color image processing apparatus comprising:
- image processing means including light means for exposing a document;
- detecting means for detecting an image forming condition obtained from irradiation of a reference sample common for each color by said light means;
- and
- control means for controlling said image processing means in accordance with control data for each color, wherein said control data are obtained by means of an arithmetic operation of output values from said detecting means according to each color using a different operational parameter for each color for varying an operation condition of said processing means for each color to regulate an image forming condition for each color.
A color image forming apparatus comprising:
- image forming means for forming a color image on a recording medium, said image forming means having a platen for receiving thereon an original;
- detecting means for detecting an image forming condition according to reflection from the plane of said platen;
- and
- control means for controlling said image forming means in accordance with control data for each color, wherein said control data are obtained by means of an arithmetic operation of output values from said detecting means for each color using a different operational parameter for each color for varying an operation condition of said image forming means for each color to regulate an image forming condition for each color.
Dependencies are inferred from the claim text.