JPS5562471A - Developing device of electrophotography - Google Patents

Developing device of electrophotography

Info

Publication number
JPS5562471A
JPS5562471A JP13643378A JP13643378A JPS5562471A JP S5562471 A JPS5562471 A JP S5562471A JP 13643378 A JP13643378 A JP 13643378A JP 13643378 A JP13643378 A JP 13643378A JP S5562471 A JPS5562471 A JP S5562471A
Authority
JP
Japan
Prior art keywords
less
toner
omega
hardness
developer
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
JP13643378A
Other languages
Japanese (ja)
Other versions
JPS6231346B2 (en
Inventor
Hiroki Izumi
Teruyuki Onuma
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 JP13643378A priority Critical patent/JPS5562471A/en
Publication of JPS5562471A publication Critical patent/JPS5562471A/en
Publication of JPS6231346B2 publication Critical patent/JPS6231346B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Magnetic Brush Developing In Electrophotography (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

PURPOSE:To prevent occurrence of excess current and make uniform the thickness of toner layer, by heightening the volume resistivity value and hardness at both ends of developing roller than those in the intermediate part where developer deposits. CONSTITUTION:A developing roller 2 is made of silicone rubber or the like, so that the both end parts 2B where developer (toner 6) does not deposit and the middle part 2A where the toner 6 deposits may have volume resistivity value of about 10<7>OMEGA.cm or more, and about 10<5>OMEGA.cm or less, and hardness of about 60HS or more, and HS or less, respectively, and the surface roughness is set about 5mu or less. As a result, occurrence of excess current due to leak may be prevented, and even if an excessive pressure is applied to one end of a charging blade 5, the roller 2 is not dented inward, and the thickness of toner layer may be always kept at a constant value.
JP13643378A 1978-11-06 1978-11-06 Developing device of electrophotography Granted JPS5562471A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13643378A JPS5562471A (en) 1978-11-06 1978-11-06 Developing device of electrophotography

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13643378A JPS5562471A (en) 1978-11-06 1978-11-06 Developing device of electrophotography

Publications (2)

Publication Number Publication Date
JPS5562471A true JPS5562471A (en) 1980-05-10
JPS6231346B2 JPS6231346B2 (en) 1987-07-08

Family

ID=15175017

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13643378A Granted JPS5562471A (en) 1978-11-06 1978-11-06 Developing device of electrophotography

Country Status (1)

Country Link
JP (1) JPS5562471A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6143762A (en) * 1984-08-07 1986-03-03 Fuji Xerox Co Ltd Developing device of nonmagnetic one-component developer
US4827305A (en) * 1986-12-18 1989-05-02 Minolta Camera Kabushiki Kaisha Developing apparatus
US4990963A (en) * 1987-07-16 1991-02-05 Minolta Camera Co., Ltd. Senri Center Developing member composed of conductive particles in a dielectric material and having a variable volume resistivity

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3661644B2 (en) 2001-12-28 2005-06-15 ブラザー工業株式会社 Developing device and image forming apparatus
JP2006184556A (en) 2004-12-27 2006-07-13 Brother Ind Ltd Process cartridge and image forming apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6143762A (en) * 1984-08-07 1986-03-03 Fuji Xerox Co Ltd Developing device of nonmagnetic one-component developer
US4827305A (en) * 1986-12-18 1989-05-02 Minolta Camera Kabushiki Kaisha Developing apparatus
US4990963A (en) * 1987-07-16 1991-02-05 Minolta Camera Co., Ltd. Senri Center Developing member composed of conductive particles in a dielectric material and having a variable volume resistivity

Also Published As

Publication number Publication date
JPS6231346B2 (en) 1987-07-08

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