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JPS55121453A - Electrophotographic copier - Google Patents

Electrophotographic copier

Info

Publication number
JPS55121453A
JPS55121453A JP2936679A JP2936679A JPS55121453A JP S55121453 A JPS55121453 A JP S55121453A JP 2936679 A JP2936679 A JP 2936679A JP 2936679 A JP2936679 A JP 2936679A JP S55121453 A JPS55121453 A JP S55121453A
Authority
JP
Japan
Prior art keywords
photoreceptor drum
sensitivity photoreceptor
developing
sensitivity
constant
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
JP2936679A
Other languages
Japanese (ja)
Inventor
Fumiyoshi Nishimura
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP2936679A priority Critical patent/JPS55121453A/en
Publication of JPS55121453A publication Critical patent/JPS55121453A/en
Pending legal-status Critical Current

Links

Landscapes

  • Dry Development In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE: To make the toner density of images constant by using the temperature rise detection value of high-sensitivity photoreceptor for control input.
CONSTITUTION: A temperature detector 24 is provided near the surface of a high- sensitivity photoreceptor drum 15 and is connected to the control unit 30 which controls the bias voltage of the magnetic brush 27 of a developing device. As a result of this, when the high-sensitivity photoreceptor drum 15 revolves in the arrow u direction and charging, exposure, developing, transfer and cleaning are accomplished subsequently by the device group disposed around the same, the surface temperature change of the high-sensitivity photoreceptor drum 15 is detected and is inputted to a feedback circuit 26. Along with the temperature change, a variable resistor 28 is controlled so that the bias voltage of a magnetic brush 27 is changed, whereby the contrast potentials are maintained always constant irrespective of the change of the surface temperature of the high-sensitivity photoreceptor drum 15, thus the toner pickup amount at the developing is made constant and the toner density of image made constant.
COPYRIGHT: (C)1980,JPO&Japio
JP2936679A 1979-03-15 1979-03-15 Electrophotographic copier Pending JPS55121453A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2936679A JPS55121453A (en) 1979-03-15 1979-03-15 Electrophotographic copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2936679A JPS55121453A (en) 1979-03-15 1979-03-15 Electrophotographic copier

Publications (1)

Publication Number Publication Date
JPS55121453A true JPS55121453A (en) 1980-09-18

Family

ID=12274160

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2936679A Pending JPS55121453A (en) 1979-03-15 1979-03-15 Electrophotographic copier

Country Status (1)

Country Link
JP (1) JPS55121453A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59105661A (en) * 1982-12-10 1984-06-19 Ricoh Co Ltd Image controlling method in electrophotographic copying machine
US4496238A (en) * 1982-03-31 1985-01-29 Canon Kabushiki Kaisha Image recording apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53115233A (en) * 1977-03-18 1978-10-07 Ricoh Co Ltd Control for electrophotogtaphic copier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53115233A (en) * 1977-03-18 1978-10-07 Ricoh Co Ltd Control for electrophotogtaphic copier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4496238A (en) * 1982-03-31 1985-01-29 Canon Kabushiki Kaisha Image recording apparatus
JPS59105661A (en) * 1982-12-10 1984-06-19 Ricoh Co Ltd Image controlling method in electrophotographic copying machine

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