JPS54134631A - Electrophotographic copying process - Google Patents
Electrophotographic copying processInfo
- Publication number
- JPS54134631A JPS54134631A JP4237278A JP4237278A JPS54134631A JP S54134631 A JPS54134631 A JP S54134631A JP 4237278 A JP4237278 A JP 4237278A JP 4237278 A JP4237278 A JP 4237278A JP S54134631 A JPS54134631 A JP S54134631A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- latent image
- image
- static latent
- polarity
- 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.)
- Pending
Links
Landscapes
- Electrophotography Using Other Than Carlson'S Method (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
- Developing For Electrophotography (AREA)
Abstract
PURPOSE:To enable positive and negative images to be selectively formed without exchanging photoreceptor kind and toner at all, by changing a voltage to be applied to a charge injecting electrode. CONSTITUTION:Magnetic toner 10 attracted magnetically to developing sleeve 8 is charged with charge injecting electrode 7 to develop a static latent image on photosensitive drum 1. Bias voltage Vs to be applied to developing sleeve 8 is set to be same in polarity as the static latent image and to be in the relation: ¦Vs¦> ¦VI¦, and voltage VE to be applied to electrode 7 is set to be reverse in polarity to the static latent image or to the grounded voltage in order to form a positive image, where VI is the surface voltage of an image area, and VN is that of a nonimage area. On the other hand, in order to form a negative image, voltage VE is set to be same in polarity as the static latent image.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4237278A JPS54134631A (en) | 1978-04-11 | 1978-04-11 | Electrophotographic copying process |
US06/015,471 US4350749A (en) | 1978-02-28 | 1979-02-26 | Reverse development method |
DE2954126A DE2954126C2 (en) | 1978-02-28 | 1979-02-28 | Reversal development process for electrostatic charge images on an electrophotographic recording medium |
DE2907713A DE2907713C2 (en) | 1978-02-28 | 1979-02-28 | Reversal development process for electrostatic charge images |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4237278A JPS54134631A (en) | 1978-04-11 | 1978-04-11 | Electrophotographic copying process |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54134631A true JPS54134631A (en) | 1979-10-19 |
Family
ID=12634202
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4237278A Pending JPS54134631A (en) | 1978-02-28 | 1978-04-11 | Electrophotographic copying process |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54134631A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5811972A (en) * | 1981-07-15 | 1983-01-22 | Fuji Xerox Co Ltd | Developing device for electronic copying machine |
JPS58123571A (en) * | 1982-01-11 | 1983-07-22 | ピツトネイ・ボウズ・インコ−ポレ−テツド | Self cleaning zerograph apparatus |
-
1978
- 1978-04-11 JP JP4237278A patent/JPS54134631A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5811972A (en) * | 1981-07-15 | 1983-01-22 | Fuji Xerox Co Ltd | Developing device for electronic copying machine |
JPS58123571A (en) * | 1982-01-11 | 1983-07-22 | ピツトネイ・ボウズ・インコ−ポレ−テツド | Self cleaning zerograph apparatus |
JPH0546552B2 (en) * | 1982-01-11 | 1993-07-14 | Pitney Bowes Inc |
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