JPS55120045A - Method and device for development - Google Patents
Method and device for developmentInfo
- Publication number
- JPS55120045A JPS55120045A JP2690379A JP2690379A JPS55120045A JP S55120045 A JPS55120045 A JP S55120045A JP 2690379 A JP2690379 A JP 2690379A JP 2690379 A JP2690379 A JP 2690379A JP S55120045 A JPS55120045 A JP S55120045A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- alternating electric
- electric fields
- magnetic
- fields
- 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)
Abstract
PURPOSE: To make possible the good sensible images of superior reproducibility of the images and high gradation characteristic by applying alternating electric fields between a photosensitive drum and toner support roll and selectively applying the magnetic fields of differenct magnetic flux densities.
CONSTITUTION: A toner carrying body 11 is so disposed as to have a minute clearance from a photoreceptor 2 and alternating electric fields are applied between the both by a power source 23. Reciprocating motion is created in the toner by the action of the alternating electric fields and this enables the development of high gradation characteritics to be performed. However, when the original is colored paper, photographic fogs are liable to occur. Thereupon, a magnet 13 having magnetic poles N1WN4, S1WS4 is provided in the toner carrying body 11 and is positioned by a shaft 15. The intensities of the magnetic poles are made in the order of N1>S1>N2. By adjusting the intensites of their magnetic fields, the toner transfer threshold values having been energized by the foregoing alternating electric fields are controlled. As a result of this, if N1 is used for colored paper and the weak magnet of N2 for white paper, the good sensible images free from photographic fogs may be obtained.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2690379A JPS55120045A (en) | 1979-03-08 | 1979-03-08 | Method and device for development |
DE19803008913 DE3008913A1 (en) | 1979-03-08 | 1980-03-07 | High resolution toner developer unit for photocopier - uses toner bristles of limited thickness and HF field to transfer toner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2690379A JPS55120045A (en) | 1979-03-08 | 1979-03-08 | Method and device for development |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55120045A true JPS55120045A (en) | 1980-09-16 |
JPS641021B2 JPS641021B2 (en) | 1989-01-10 |
Family
ID=12206182
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2690379A Granted JPS55120045A (en) | 1979-03-08 | 1979-03-08 | Method and device for development |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55120045A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57153361U (en) * | 1981-03-19 | 1982-09-27 | ||
JPS60159771A (en) * | 1984-01-30 | 1985-08-21 | Konishiroku Photo Ind Co Ltd | Image forming method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1458766A (en) * | 1973-02-15 | 1976-12-15 | Xerox Corp | Xerographic developing apparatus |
JPS5267633A (en) * | 1975-12-02 | 1977-06-04 | Ricoh Co Ltd | Method for electronic photo-copying |
JPS52140337A (en) * | 1976-05-19 | 1977-11-22 | Hitachi Metals Ltd | Electrostatic charge image apparatus |
-
1979
- 1979-03-08 JP JP2690379A patent/JPS55120045A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1458766A (en) * | 1973-02-15 | 1976-12-15 | Xerox Corp | Xerographic developing apparatus |
JPS5267633A (en) * | 1975-12-02 | 1977-06-04 | Ricoh Co Ltd | Method for electronic photo-copying |
JPS52140337A (en) * | 1976-05-19 | 1977-11-22 | Hitachi Metals Ltd | Electrostatic charge image apparatus |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57153361U (en) * | 1981-03-19 | 1982-09-27 | ||
JPS60159771A (en) * | 1984-01-30 | 1985-08-21 | Konishiroku Photo Ind Co Ltd | Image forming method |
Also Published As
Publication number | Publication date |
---|---|
JPS641021B2 (en) | 1989-01-10 |
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