JPS54134631A - Electrophotographic copying process - Google Patents

Electrophotographic copying process

Info

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
Application number
JP4237278A
Other languages
Japanese (ja)
Inventor
Hajime Koyama
Seiichi Miyagawa
Teruyuki Onuma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP4237278A priority Critical patent/JPS54134631A/en
Priority to US06/015,471 priority patent/US4350749A/en
Priority to DE2954126A priority patent/DE2954126C2/en
Priority to DE2907713A priority patent/DE2907713C2/en
Publication of JPS54134631A publication Critical patent/JPS54134631A/en
Pending legal-status Critical Current

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.
JP4237278A 1978-02-28 1978-04-11 Electrophotographic copying process Pending JPS54134631A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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