JPS5650340A - Electrophotographic apparatus - Google Patents
Electrophotographic apparatusInfo
- Publication number
- JPS5650340A JPS5650340A JP12618479A JP12618479A JPS5650340A JP S5650340 A JPS5650340 A JP S5650340A JP 12618479 A JP12618479 A JP 12618479A JP 12618479 A JP12618479 A JP 12618479A JP S5650340 A JPS5650340 A JP S5650340A
- Authority
- JP
- Japan
- Prior art keywords
- photoreceptor
- discharger
- transfer
- bias voltage
- voltage
- 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
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE: To obtain a copy image free from uneven transfer and fog, by providing a transfer-preceding corona discharger between a developing device and a transfer charger in order to apply a specified bias voltage.
CONSTITUTION: Surface potential of photoreceptor 1 after development is +700V and +200V, respectively. Discharge electrode 4 is covered with discharger shield 5, and subjected to about 6kV AC voltage. Tungsten wires are stretched as a control grating at the position of the opening of discharger on the side of photoreceptor 1, and connected to bias voltage source 7. Bias voltage between the light and dark area voltage of photoreceptor 1 is selected in order to form an accelerating electric field and a restricting electric field of corona ions between the surface potential of photoreceptor 1 and the control grating. As a result, the dark area toner is charged more negatively to enhance transferability, and only the toner attached to nonimage areas is converted into a reverse polarity, thus permitting uneven transfer and fog to be prevented.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12618479A JPS5650340A (en) | 1979-09-29 | 1979-09-29 | Electrophotographic apparatus |
US06/191,030 US4402591A (en) | 1979-09-29 | 1980-09-26 | Electrophotographic apparatus |
GB8031336A GB2062548B (en) | 1979-09-29 | 1980-09-29 | Electrophotographic apparatus |
DE19803036731 DE3036731A1 (en) | 1979-09-29 | 1980-09-29 | ELECTROPHOTOGRAPHIC DEVICE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12618479A JPS5650340A (en) | 1979-09-29 | 1979-09-29 | Electrophotographic apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5650340A true JPS5650340A (en) | 1981-05-07 |
JPH0143309B2 JPH0143309B2 (en) | 1989-09-20 |
Family
ID=14928761
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12618479A Granted JPS5650340A (en) | 1979-09-29 | 1979-09-29 | Electrophotographic apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5650340A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5250995A (en) * | 1990-07-20 | 1993-10-05 | Bull Hn Information Systems Italia, S.P.A. | Electrophotographic developing apparatus having image quality improving devices |
-
1979
- 1979-09-29 JP JP12618479A patent/JPS5650340A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5250995A (en) * | 1990-07-20 | 1993-10-05 | Bull Hn Information Systems Italia, S.P.A. | Electrophotographic developing apparatus having image quality improving devices |
Also Published As
Publication number | Publication date |
---|---|
JPH0143309B2 (en) | 1989-09-20 |
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