JPS5545059A - Reversal bias developing method - Google Patents

Reversal bias developing method

Info

Publication number
JPS5545059A
JPS5545059A JP11866278A JP11866278A JPS5545059A JP S5545059 A JPS5545059 A JP S5545059A JP 11866278 A JP11866278 A JP 11866278A JP 11866278 A JP11866278 A JP 11866278A JP S5545059 A JPS5545059 A JP S5545059A
Authority
JP
Japan
Prior art keywords
bias voltage
developing
developing sleeve
image
photosensitive 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
JP11866278A
Other languages
Japanese (ja)
Other versions
JPS6240711B2 (en
Inventor
Masao Masumura
Tetsuo Sakurai
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 JP11866278A priority Critical patent/JPS5545059A/en
Publication of JPS5545059A publication Critical patent/JPS5545059A/en
Publication of JPS6240711B2 publication Critical patent/JPS6240711B2/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 prevent deposition of toner on non-image portions by changing over the bias voltage of a developing sleeve in timing to the time when the specified position on the surface of a photosensitive drum opposes to the developing sleeve thereby cutting the application of the voltage or lowering the same. CONSTITUTION:Application of bias voltage to a developing sleeve 3 is accomplished at the time when the position on the surface of a photosensitive drum 1 which is within the charging region of the surface of the drum and does not enter the image region of the photosensitive drum 1 surface arrives at the position oppositing to the developing sleeve 3. On the other hand, changing-over of the developing bias voltage to the OFF state is accomplished at the time when the surface position of the drum 1 opposing to the developing roller 3 is within the charging region after passage of the end part of the image region. Operation in this way reduces the range of the non-image portions where the developing bias voltage is being applied and reduces the pickup of the toner on the non-image parts.
JP11866278A 1978-09-28 1978-09-28 Reversal bias developing method Granted JPS5545059A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11866278A JPS5545059A (en) 1978-09-28 1978-09-28 Reversal bias developing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11866278A JPS5545059A (en) 1978-09-28 1978-09-28 Reversal bias developing method

Publications (2)

Publication Number Publication Date
JPS5545059A true JPS5545059A (en) 1980-03-29
JPS6240711B2 JPS6240711B2 (en) 1987-08-29

Family

ID=14742105

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11866278A Granted JPS5545059A (en) 1978-09-28 1978-09-28 Reversal bias developing method

Country Status (1)

Country Link
JP (1) JPS5545059A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56165171A (en) * 1980-05-01 1981-12-18 Canon Inc Image forming device
JPS60249171A (en) * 1984-05-25 1985-12-09 Konishiroku Photo Ind Co Ltd Image forming method
JPS61277977A (en) * 1985-06-04 1986-12-08 Canon Inc Image forming device
JPS6311971A (en) * 1986-07-03 1988-01-19 Canon Inc image forming device
JPS6313080A (en) * 1986-07-03 1988-01-20 Canon Inc Electrophotographic device providing reversal development
JPS6337365A (en) * 1986-07-31 1988-02-18 Sharp Corp Inverted image forming method
US4984022A (en) * 1987-11-26 1991-01-08 Minolta Camera Kabushiki Kaisha Image forming apparatus having means for attenuating bias voltage of the developing sleeve
US5132738A (en) * 1987-12-28 1992-07-21 Canon Kabushiki Kaisha Image forming apparatus with cleaning mechanism for charging electrode
EP0693714A1 (en) * 1994-07-21 1996-01-24 Brother Kogyo Kabushiki Kaisha Method and apparatus for controlling discharge potentials and timing in a reversal development type image forming apparatus
US5500720A (en) * 1992-12-30 1996-03-19 Ricoh Company, Ltd. Bias application control device for image forming apparatus using reverse development

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4838152A (en) * 1971-09-10 1973-06-05

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4838152A (en) * 1971-09-10 1973-06-05

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56165171A (en) * 1980-05-01 1981-12-18 Canon Inc Image forming device
JPS60249171A (en) * 1984-05-25 1985-12-09 Konishiroku Photo Ind Co Ltd Image forming method
JPS61277977A (en) * 1985-06-04 1986-12-08 Canon Inc Image forming device
JPS6311971A (en) * 1986-07-03 1988-01-19 Canon Inc image forming device
JPS6313080A (en) * 1986-07-03 1988-01-20 Canon Inc Electrophotographic device providing reversal development
JPS6337365A (en) * 1986-07-31 1988-02-18 Sharp Corp Inverted image forming method
US4984022A (en) * 1987-11-26 1991-01-08 Minolta Camera Kabushiki Kaisha Image forming apparatus having means for attenuating bias voltage of the developing sleeve
US5132738A (en) * 1987-12-28 1992-07-21 Canon Kabushiki Kaisha Image forming apparatus with cleaning mechanism for charging electrode
US5500720A (en) * 1992-12-30 1996-03-19 Ricoh Company, Ltd. Bias application control device for image forming apparatus using reverse development
EP0693714A1 (en) * 1994-07-21 1996-01-24 Brother Kogyo Kabushiki Kaisha Method and apparatus for controlling discharge potentials and timing in a reversal development type image forming apparatus
US5652953A (en) * 1994-07-21 1997-07-29 Brother Kogyo Kabushiki Kaisha Method and apparatus for controlling discharge potentials and timing in a reversal development type image forming apparatus

Also Published As

Publication number Publication date
JPS6240711B2 (en) 1987-08-29

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