JPS5562471A - Developing device of electrophotography - Google Patents
Developing device of electrophotographyInfo
- 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
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.
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)
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)
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 |
-
1978
- 1978-11-06 JP JP13643378A patent/JPS5562471A/en active Granted
Cited By (3)
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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