JPS5552076A - Charging device of powder - Google Patents

Charging device of powder

Info

Publication number
JPS5552076A
JPS5552076A JP12476878A JP12476878A JPS5552076A JP S5552076 A JPS5552076 A JP S5552076A JP 12476878 A JP12476878 A JP 12476878A JP 12476878 A JP12476878 A JP 12476878A JP S5552076 A JPS5552076 A JP S5552076A
Authority
JP
Japan
Prior art keywords
toner
resistance
specific volume
powder
pressure contact
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
JP12476878A
Other languages
Japanese (ja)
Inventor
Teruyuki Onuma
Hiroki Izumi
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 JP12476878A priority Critical patent/JPS5552076A/en
Publication of JPS5552076A publication Critical patent/JPS5552076A/en
Pending legal-status Critical Current

Links

Landscapes

  • Magnetic Brush Developing In Electrophotography (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

PURPOSE:To so charge the powder whose pressure contact resistance is of the specific value that it has the specified polarity and potential meeting the purpose by using said powder and setting the specific volume resistance of the electrode part smaller than the specific resistance of the powder substrate surface part. CONSTITUTION:Performing good developing necessitates charging the toner to the same polarity. As a result of the experiment done by changing the specific volume resistance values of electrodes and the materials constituting the surface of developing rollers, the specific volume resistance of the electrode portion is set smaller than the specific volume resistance of the roller surface portion. Further, at 10<6>OMEGAcm or under of the pressure contact resistance of the toner, the time constant of the toner becomes smaller and it becomes infeasible for the toner to maintain the charges of more than a fixed quantity and therefore the pressure contact resistance of more than 10<6>OMEGAcm becomes necessary. By satisfying these conditions, the fog-free images of superior sharpness may be obtained in visualizing the electrostatic latent images.
JP12476878A 1978-10-11 1978-10-11 Charging device of powder Pending JPS5552076A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12476878A JPS5552076A (en) 1978-10-11 1978-10-11 Charging device of powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12476878A JPS5552076A (en) 1978-10-11 1978-10-11 Charging device of powder

Publications (1)

Publication Number Publication Date
JPS5552076A true JPS5552076A (en) 1980-04-16

Family

ID=14893630

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12476878A Pending JPS5552076A (en) 1978-10-11 1978-10-11 Charging device of powder

Country Status (1)

Country Link
JP (1) JPS5552076A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50117432A (en) * 1974-02-16 1975-09-13
JPS5323639A (en) * 1976-08-17 1978-03-04 Canon Inc Development device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50117432A (en) * 1974-02-16 1975-09-13
JPS5323639A (en) * 1976-08-17 1978-03-04 Canon Inc Development device

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