JPS593457A - Control system of image density - Google Patents

Control system of image density

Info

Publication number
JPS593457A
JPS593457A JP11277082A JP11277082A JPS593457A JP S593457 A JPS593457 A JP S593457A JP 11277082 A JP11277082 A JP 11277082A JP 11277082 A JP11277082 A JP 11277082A JP S593457 A JPS593457 A JP S593457A
Authority
JP
Japan
Prior art keywords
potential
density
dark
measured
image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP11277082A
Other languages
Japanese (ja)
Inventor
Tetsuya Takei
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP11277082A priority Critical patent/JPS593457A/en
Publication of JPS593457A publication Critical patent/JPS593457A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/50Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5033Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
    • G03G15/5037Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor the characteristics being an electrical parameter, e.g. voltage
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/50Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5033Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
    • G03G15/5041Detecting a toner image, e.g. density, toner coverage, using a test patch

Abstract

PURPOSE:To stabilize the density and gradation of a toner image, by setting the potential in the dark part of a V-D curve at a prescribed value in accordance with the measurement of the potential of a latent image, and controlling the inclination of the V-D curve in accordance with the measured density of the developed image. CONSTITUTION:A reference latent image is formed on a photoreceptor 1 by flickering of a blank exposing lamp after prescribed preparative operations upon turning on of a main switch. Both surface potentials in the bright and dark parts are measured alternately with a surface electrometer 7, and a primary electrostatic charger 3 is controlled to obtain the initially set surface potential. The standard white plate on the original plate is irradiated, and the quantity of the light of a lamp for illuminating the original is so controlled that the potential of the electrometer 7 attains 0V. The surface potential on the drum is measured and the potential for the DC component of a developing bias is determined. The potential for said DC component is applied on the drum to develop the latent image in the dark part and the density of the toner is measured with a detector 9 for reflection density, whereby the adequate surface potential in the dark part is determined. The similar control is successively accomplished in accordance with the surface potential determined in the above-mentioned way to control the height and inclination of the V-D curve, whereby the image having good density and gradation is obtd.
JP11277082A 1982-06-30 1982-06-30 Control system of image density Pending JPS593457A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11277082A JPS593457A (en) 1982-06-30 1982-06-30 Control system of image density

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11277082A JPS593457A (en) 1982-06-30 1982-06-30 Control system of image density

Publications (1)

Publication Number Publication Date
JPS593457A true JPS593457A (en) 1984-01-10

Family

ID=14595070

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11277082A Pending JPS593457A (en) 1982-06-30 1982-06-30 Control system of image density

Country Status (1)

Country Link
JP (1) JPS593457A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5933733A (en) * 1982-08-18 1984-02-23 Takamatsu Electric Works Ltd Fuse element of current limiting fuse
EP0768580A2 (en) * 1995-10-12 1997-04-16 Sharp Kabushiki Kaisha Image quality stabilizer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5933733A (en) * 1982-08-18 1984-02-23 Takamatsu Electric Works Ltd Fuse element of current limiting fuse
EP0768580A2 (en) * 1995-10-12 1997-04-16 Sharp Kabushiki Kaisha Image quality stabilizer
EP0768580A3 (en) * 1995-10-12 2000-09-13 Sharp Kabushiki Kaisha Image quality stabilizer

Similar Documents

Publication Publication Date Title
JPS5518667A (en) Stabilization method of image density
GB2012081A (en) Photocopying
JPS593457A (en) Control system of image density
JPS6052868A (en) Image forming device
JPS58182650A (en) Method for adjusting control device for image density of electrophotographic copying machine
JPS57118255A (en) Electrostatic recorder
JPS6127572A (en) Electrophotographic device
JPS57169763A (en) Picture recording controller
JPS61103169A (en) Image forming device
JPS5981662A (en) Picture forming device
JPS56151946A (en) Electrophotographic copier
JPS58190966A (en) Electrophotographic copying machine
JPS56144450A (en) Image stabilizing method
JPS63179380A (en) Toner concentration control mechanism
JPS57118256A (en) Electrostatic recorder
JPS60178468A (en) Picture density control method
JPS60133475A (en) Electrophotographic copying machine
JPS58224355A (en) Method for correcting surface potential of photoreceptor of electrophotographic copying machine
JPH0371156A (en) Image forming device
JPS56113161A (en) Electrophotographic method
JPS5722272A (en) Electrophotographic method
JPS61278877A (en) Image forming device
JPS5722269A (en) Electrophotographic method
JPS5872175A (en) Toner density controlling method for electrophotographic copying machine
JPS6111767A (en) Image control device