JPS55120043A - Method and device of development - Google Patents
Method and device of developmentInfo
- Publication number
- JPS55120043A JPS55120043A JP2690479A JP2690479A JPS55120043A JP S55120043 A JPS55120043 A JP S55120043A JP 2690479 A JP2690479 A JP 2690479A JP 2690479 A JP2690479 A JP 2690479A JP S55120043 A JPS55120043 A JP S55120043A
- Authority
- JP
- Japan
- Prior art keywords
- images
- roller
- pole
- toner
- 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
Links
Abstract
PURPOSE: To obtain the developing method which is capable of well reporducing the both of fine line images and gradation images by applying alternating bias voltages between photosensitive drum and developer roller and further changing over repulsive magnetifc field and single magnetic field within the roller.
CONSTITUTION: The developing device is constituted by a photosensitive drum 5, toner support roller 7 and an alternating electric field applying power source 16 for applying alternating bias voltages between the both. Further, a magnet roll 12 is provided in the toner roller 7. The magnet roll 12 has the magnetic pole M1 consisting of mutually repulsing magnetic poles S-S and the single magnetic pole M2 consisting of dissimilar pole N. This magnet 12 turns a lever 13 against a spring 14 by a plunger 15. Now, when the M1 pole is opposed in the drum 5 in the case of fine wire images, the toners repulse with each other and the density becomes coarse to weaken the adhesion power onto the roller 7, thus the toner movement is readily accomplished and the good images may be obtained. In the case of gradation images, the images free from photographic fogs may be obtained by using the M2 pole.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2690479A JPS55120043A (en) | 1979-03-08 | 1979-03-08 | Method and device of 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 |
---|---|---|---|
JP2690479A JPS55120043A (en) | 1979-03-08 | 1979-03-08 | Method and device of development |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55120043A true JPS55120043A (en) | 1980-09-16 |
JPS6342784B2 JPS6342784B2 (en) | 1988-08-25 |
Family
ID=12206209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2690479A Granted JPS55120043A (en) | 1979-03-08 | 1979-03-08 | Method and device of development |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55120043A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60131553A (en) * | 1983-12-20 | 1985-07-13 | Konishiroku Photo Ind Co Ltd | Developing method |
EP0650099A2 (en) * | 1993-10-15 | 1995-04-26 | Canon Kabushiki Kaisha | Carrier for electrophotography, two-component type developer, and image forming method |
-
1979
- 1979-03-08 JP JP2690479A patent/JPS55120043A/en active Granted
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60131553A (en) * | 1983-12-20 | 1985-07-13 | Konishiroku Photo Ind Co Ltd | Developing method |
JPH0414793B2 (en) * | 1983-12-20 | 1992-03-13 | Konishiroku Photo Ind | |
EP0650099A2 (en) * | 1993-10-15 | 1995-04-26 | Canon Kabushiki Kaisha | Carrier for electrophotography, two-component type developer, and image forming method |
EP0650099A3 (en) * | 1993-10-15 | 1995-09-27 | Canon Kk | Carrier for electrophotography, two-component type developer, and image forming method. |
US5885742A (en) * | 1993-10-15 | 1999-03-23 | Canon Kabushiki Kaisha | Carrier for electrophotography, two-component type developer, and image forming method |
Also Published As
Publication number | Publication date |
---|---|
JPS6342784B2 (en) | 1988-08-25 |
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