JPS54115233A - Reversal development process - Google Patents

Reversal development process

Info

Publication number
JPS54115233A
JPS54115233A JP2248478A JP2248478A JPS54115233A JP S54115233 A JPS54115233 A JP S54115233A JP 2248478 A JP2248478 A JP 2248478A JP 2248478 A JP2248478 A JP 2248478A JP S54115233 A JPS54115233 A JP S54115233A
Authority
JP
Japan
Prior art keywords
toner
voltage
developing
roller
drum
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
JP2248478A
Other languages
Japanese (ja)
Other versions
JPS6223310B2 (en
Inventor
Teruyuki Onuma
Seiichi Miyagawa
Hajime Koyama
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 JP2248478A priority Critical patent/JPS54115233A/en
Priority to US06/015,471 priority patent/US4350749A/en
Priority to DE2954126A priority patent/DE2954126C2/en
Priority to DE2907713A priority patent/DE2907713C2/en
Publication of JPS54115233A publication Critical patent/JPS54115233A/en
Publication of JPS6223310B2 publication Critical patent/JPS6223310B2/ja
Granted legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To obtain good images using one component type developer without any useless consumption of toner, by applying different specified bias voltages to a developer feeder in developing and in not developing.
CONSTITUTION: Photosensitive drum 14 is positively charged with corona charger 15, and a negative latent image is formed by imagewise exposure. Toner having a volume resistivity of above 1013 ohm.cm in a powder state is fed from hopper 18 to conductive developing roller 17, and the toner is positively charged with toner charger 20 made of friction charging blades. In developing, positive voltage is applied to roller 17 from voltage supply E1 of bias voltage controller 19, and the toner is attached to apparently negative low voltage areas, resulting in effecting reversal development. When development is stopped, negative voltage is applied to roller 17 from voltage supply E2, thereby permitting the toner not to be attached to drum 14, because toner charge polarity is positive, even if residual voltage on drum 14 is as high as several ten volts.
COPYRIGHT: (C)1979,JPO&Japio
JP2248478A 1978-02-28 1978-02-28 Reversal development process Granted JPS54115233A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2248478A JPS54115233A (en) 1978-02-28 1978-02-28 Reversal development process
US06/015,471 US4350749A (en) 1978-02-28 1979-02-26 Reverse development method
DE2954126A DE2954126C2 (en) 1978-02-28 1979-02-28 Reversal development process for electrostatic charge images on an electrophotographic recording medium
DE2907713A DE2907713C2 (en) 1978-02-28 1979-02-28 Reversal development process for electrostatic charge images

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2248478A JPS54115233A (en) 1978-02-28 1978-02-28 Reversal development process

Publications (2)

Publication Number Publication Date
JPS54115233A true JPS54115233A (en) 1979-09-07
JPS6223310B2 JPS6223310B2 (en) 1987-05-22

Family

ID=12083990

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2248478A Granted JPS54115233A (en) 1978-02-28 1978-02-28 Reversal development process

Country Status (1)

Country Link
JP (1) JPS54115233A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5654447A (en) * 1979-10-09 1981-05-14 Hitachi Koki Co Ltd Electrophotographic reversal development method
JPS58123571A (en) * 1982-01-11 1983-07-22 ピツトネイ・ボウズ・インコ−ポレ−テツド Self cleaning zerograph apparatus
JPS597973A (en) * 1982-06-28 1984-01-17 ゼロツクス・コ−ポレ−シヨン Developer for electrophotographic copying machine
JPS59133573A (en) * 1983-01-20 1984-07-31 Toshiba Corp Image forming device
JPS6313080A (en) * 1986-07-03 1988-01-20 Canon Inc Electrophotographic device providing reversal development
JPH08227210A (en) * 1995-02-22 1996-09-03 Nec Data Terminal Ltd Electrophotographic printer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0583812U (en) * 1992-04-10 1993-11-12 株式会社本山製作所 Pressure reducing valve

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5654447A (en) * 1979-10-09 1981-05-14 Hitachi Koki Co Ltd Electrophotographic reversal development method
JPS58123571A (en) * 1982-01-11 1983-07-22 ピツトネイ・ボウズ・インコ−ポレ−テツド Self cleaning zerograph apparatus
JPH0546552B2 (en) * 1982-01-11 1993-07-14 Pitney Bowes Inc
JPS597973A (en) * 1982-06-28 1984-01-17 ゼロツクス・コ−ポレ−シヨン Developer for electrophotographic copying machine
JPS59133573A (en) * 1983-01-20 1984-07-31 Toshiba Corp Image forming device
JPS6313080A (en) * 1986-07-03 1988-01-20 Canon Inc Electrophotographic device providing reversal development
JPH08227210A (en) * 1995-02-22 1996-09-03 Nec Data Terminal Ltd Electrophotographic printer

Also Published As

Publication number Publication date
JPS6223310B2 (en) 1987-05-22

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