JPS5529856A - Image former - Google Patents

Image former

Info

Publication number
JPS5529856A
JPS5529856A JP10303678A JP10303678A JPS5529856A JP S5529856 A JPS5529856 A JP S5529856A JP 10303678 A JP10303678 A JP 10303678A JP 10303678 A JP10303678 A JP 10303678A JP S5529856 A JPS5529856 A JP S5529856A
Authority
JP
Japan
Prior art keywords
drum
current
corona
fluctuations
output
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
JP10303678A
Other languages
Japanese (ja)
Other versions
JPS6211345B2 (en
Inventor
Koji Suzuki
Yoshikazu Yokomizo
Yoshitaka Kawamo
Shinkichi Takahashi
Hiroaki Tsuchiya
Shinichi Iwasaki
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.)
Canon Inc
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 JP10303678A priority Critical patent/JPS5529856A/en
Priority to GB7929344A priority patent/GB2039101B/en
Priority to DE19792934337 priority patent/DE2934337A1/en
Publication of JPS5529856A publication Critical patent/JPS5529856A/en
Priority to GB08228797A priority patent/GB2108719B/en
Publication of JPS6211345B2 publication Critical patent/JPS6211345B2/ja
Priority to US07/675,053 priority patent/US5164771A/en
Granted legal-status Critical Current

Links

Landscapes

  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE: To correct the power source fluctuations of a corona discharger and enable current to be maintained constant by so constituting the device that the constant current circuits for detecting the surface potentials on a recording medium and flowing the current corresponding to the detection output thereof to corona dischargers are provided.
CONSTITUTION: An initial value set voltage is inputted from terminal 59 to a multiplexer 56 during the previous rotation of the drum 11 prior to starting of copying operation and the corona current corresponding to the set voltage is flowed from primary and secondary charger high voltage power source circuits 57, 58 to the drum 11. Next, the surface potential of the drum 11 is detected with a surface electrometer 50 and is inputted as the voltage output to a holding circuit 54 in a potential measurement circuit 53. An arithmetic circuit 55 flows the signal corresponding to the correct DC value to the chargers 22, 23 based on the output of the holding circuit 54. By making the current flowing in the high voltage power sources to constant current, the load fluctuations between the chargers 22, 23 and drum 11 owing to environmental fluctuations and degradation of the photoreceptor may be corrected.
COPYRIGHT: (C)1980,JPO&Japio
JP10303678A 1978-08-24 1978-08-24 Image former Granted JPS5529856A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP10303678A JPS5529856A (en) 1978-08-24 1978-08-24 Image former
GB7929344A GB2039101B (en) 1978-08-24 1979-08-23 Control of electrostatic recording apparatus
DE19792934337 DE2934337A1 (en) 1978-08-24 1979-08-24 ELECTROSTATIC RECORDING DEVICE WITH A SURFACE POTENTIOMETER
GB08228797A GB2108719B (en) 1978-08-24 1982-10-08 Image formation apparatus
US07/675,053 US5164771A (en) 1978-08-24 1991-03-25 Image forming apparatus which adjusts illumination levels independently for test samples and for originals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10303678A JPS5529856A (en) 1978-08-24 1978-08-24 Image former

Publications (2)

Publication Number Publication Date
JPS5529856A true JPS5529856A (en) 1980-03-03
JPS6211345B2 JPS6211345B2 (en) 1987-03-12

Family

ID=14343421

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10303678A Granted JPS5529856A (en) 1978-08-24 1978-08-24 Image former

Country Status (1)

Country Link
JP (1) JPS5529856A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5182596A (en) * 1990-07-20 1993-01-26 Hitachi Koki Co., Ltd. Device for measuring surface potentials at photosensitive body and electrostatic recording apparatus using said device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49106336A (en) * 1973-01-18 1974-10-08
JPS5255537A (en) * 1975-10-31 1977-05-07 Sumitomo Electric Ind Ltd Chargning device
JPS5317339A (en) * 1976-07-30 1978-02-17 Canon Inc Method and device for stabilizing surface potential
JPS5317732A (en) * 1976-07-31 1978-02-18 Canon Inc Method and device for charging by corona discharge
JPS5355031A (en) * 1976-10-27 1978-05-19 Xerox Corp Method of and device for controlling electric charge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49106336A (en) * 1973-01-18 1974-10-08
JPS5255537A (en) * 1975-10-31 1977-05-07 Sumitomo Electric Ind Ltd Chargning device
JPS5317339A (en) * 1976-07-30 1978-02-17 Canon Inc Method and device for stabilizing surface potential
JPS5317732A (en) * 1976-07-31 1978-02-18 Canon Inc Method and device for charging by corona discharge
JPS5355031A (en) * 1976-10-27 1978-05-19 Xerox Corp Method of and device for controlling electric charge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5182596A (en) * 1990-07-20 1993-01-26 Hitachi Koki Co., Ltd. Device for measuring surface potentials at photosensitive body and electrostatic recording apparatus using said device

Also Published As

Publication number Publication date
JPS6211345B2 (en) 1987-03-12

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