JPS5720765A - Controller for copying - Google Patents

Controller for copying

Info

Publication number
JPS5720765A
JPS5720765A JP9639480A JP9639480A JPS5720765A JP S5720765 A JPS5720765 A JP S5720765A JP 9639480 A JP9639480 A JP 9639480A JP 9639480 A JP9639480 A JP 9639480A JP S5720765 A JPS5720765 A JP S5720765A
Authority
JP
Japan
Prior art keywords
original
detector
dirty
color tone
exposure lamp
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.)
Granted
Application number
JP9639480A
Other languages
Japanese (ja)
Other versions
JPS6336505B2 (en
Inventor
Nachio Seko
Masumi Ikesue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP9639480A priority Critical patent/JPS5720765A/en
Publication of JPS5720765A publication Critical patent/JPS5720765A/en
Publication of JPS6336505B2 publication Critical patent/JPS6336505B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/065—Arrangements for controlling the potential of the developing electrode

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Developing For Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

PURPOSE:To prevent the surface of an original from being dirtied or the dirty caused by an optical system by attaching a detector to detect the color tone of the surface of the original and the quantity of reflected light projected from an exposure lamp on the original and controlling the developing bias voltage according to the output from the detector. CONSTITUTION:A color tone detector 90 composed of light emitting diodes and photodiodes is installed on a contact glass plate mounting an original to detect the color tone of the surface of the original. The light projected from an exposure lamp HLA and reflected by the original is detected by light detector 80 composed of photodiodes and so on to check the dirty of mirrors and lenses and deterioration of the exposure lamp. These outputs are converted by analog/digital converters 70 and 60 and inputted to a control circuit 50b to select a suitable developing bias voltage through a developing bias circuit 40 and apply the voltage to developing electrodes. Thus, the dirty surface of originals or dirty caused by the optical system is prevented and the excellect quality of picture is obtained.
JP9639480A 1980-07-15 1980-07-15 Controller for copying Granted JPS5720765A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9639480A JPS5720765A (en) 1980-07-15 1980-07-15 Controller for copying

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9639480A JPS5720765A (en) 1980-07-15 1980-07-15 Controller for copying

Publications (2)

Publication Number Publication Date
JPS5720765A true JPS5720765A (en) 1982-02-03
JPS6336505B2 JPS6336505B2 (en) 1988-07-20

Family

ID=14163735

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9639480A Granted JPS5720765A (en) 1980-07-15 1980-07-15 Controller for copying

Country Status (1)

Country Link
JP (1) JPS5720765A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6010268A (en) * 1983-06-30 1985-01-19 Canon Inc Image processor
JPS6010267A (en) * 1983-06-30 1985-01-19 Canon Inc Image processor
JPS6010269A (en) * 1983-06-30 1985-01-19 Canon Inc Image processor
JPS6035751A (en) * 1983-08-06 1985-02-23 Canon Inc Image control device
JPS61148463A (en) * 1984-12-24 1986-07-07 Fuji Xerox Co Ltd Automatic image density controller of dry electrophotographic copying machine
JPS6337362A (en) * 1986-08-01 1988-02-18 Canon Inc Image forming method
JPS64968A (en) * 1987-06-24 1989-01-05 Sharp Corp Exposure amount setting device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6010268A (en) * 1983-06-30 1985-01-19 Canon Inc Image processor
JPS6010267A (en) * 1983-06-30 1985-01-19 Canon Inc Image processor
JPS6010269A (en) * 1983-06-30 1985-01-19 Canon Inc Image processor
JPH0532748B2 (en) * 1983-06-30 1993-05-17 Canon Kk
JPH0555867B2 (en) * 1983-06-30 1993-08-18 Canon Kk
JPH0555868B2 (en) * 1983-06-30 1993-08-18 Canon Kk
JPS6035751A (en) * 1983-08-06 1985-02-23 Canon Inc Image control device
JPH0555872B2 (en) * 1983-08-06 1993-08-18 Canon Kk
JPS61148463A (en) * 1984-12-24 1986-07-07 Fuji Xerox Co Ltd Automatic image density controller of dry electrophotographic copying machine
JPS6337362A (en) * 1986-08-01 1988-02-18 Canon Inc Image forming method
JPS64968A (en) * 1987-06-24 1989-01-05 Sharp Corp Exposure amount setting device

Also Published As

Publication number Publication date
JPS6336505B2 (en) 1988-07-20

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