JPS57177162A - Developer for electrophotography - Google Patents

Developer for electrophotography

Info

Publication number
JPS57177162A
JPS57177162A JP56061991A JP6199181A JPS57177162A JP S57177162 A JPS57177162 A JP S57177162A JP 56061991 A JP56061991 A JP 56061991A JP 6199181 A JP6199181 A JP 6199181A JP S57177162 A JPS57177162 A JP S57177162A
Authority
JP
Japan
Prior art keywords
carriers
developer
gauss
force
coercive force
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
JP56061991A
Other languages
Japanese (ja)
Inventor
Yoshisuke Takekida
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP56061991A priority Critical patent/JPS57177162A/en
Publication of JPS57177162A publication Critical patent/JPS57177162A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/10—Developers with toner particles characterised by carrier particles
    • G03G9/107—Developers with toner particles characterised by carrier particles having magnetic components
    • G03G9/108—Ferrite carrier, e.g. magnetite

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Developing Agents For Electrophotography (AREA)

Abstract

PURPOSE:To obtain an image of good quality and to obtain a long-life developer by using powder consisting of a ferritic material of specific coercive force and saturation magnetization for its carriers. CONSTITUTION:The coercive force of carriers consisting of a ferritic material relates to the fluidity of a developer; if it exceeds 10 oersted, the fluidity degrades considerably, and therefore, the coercive force is kept at 0-10Oe. Then, the toner and the carriers are thoroughly agitated, resulting in faster rising characteristics of toner charging and a longer life of the developer. Since the saturation magnetization of the carriers generates the magnetic force that overcomes electrostatic force and the centrifugal force by sleeve revolution, the carriers detach from a developing sleeve if it is <=1,500 gauss and this is of a problem particularly in high speed development. At >=6,500 gauss, a photoreceptor is vulnerable to damaging, and the quality of images is degraded. The powder controlled to 1,500-6,500 gauss is therefore used.
JP56061991A 1981-04-24 1981-04-24 Developer for electrophotography Pending JPS57177162A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56061991A JPS57177162A (en) 1981-04-24 1981-04-24 Developer for electrophotography

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56061991A JPS57177162A (en) 1981-04-24 1981-04-24 Developer for electrophotography

Publications (1)

Publication Number Publication Date
JPS57177162A true JPS57177162A (en) 1982-10-30

Family

ID=13187165

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56061991A Pending JPS57177162A (en) 1981-04-24 1981-04-24 Developer for electrophotography

Country Status (1)

Country Link
JP (1) JPS57177162A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58144839A (en) * 1982-02-13 1983-08-29 Tdk Corp Magnetic carrier particles
WO1984001837A1 (en) * 1982-11-08 1984-05-10 Eastman Kodak Co Electrographic developer composition and method for using the same
JPS59111927A (en) * 1982-12-15 1984-06-28 Hitachi Metals Ltd Ferrite carrier for electrophotography
JPS59139056A (en) * 1983-01-31 1984-08-09 Mita Ind Co Ltd Magnetic brush developing method
JPS59172660A (en) * 1983-03-23 1984-09-29 Mita Ind Co Ltd Magnetic brush developing method using ferrite carrier
JPS6138954A (en) * 1984-07-31 1986-02-25 Mita Ind Co Ltd Electrophotographic method
US4592988A (en) * 1984-08-15 1986-06-03 Halomet, Inc. Ferrite toner carrier core composition derived from fly ash
JPS6244752A (en) * 1985-08-23 1987-02-26 Fujitsu Ltd Developer composition
US4698289A (en) * 1984-08-15 1987-10-06 Halomet Inc. Process for making ferrite spherical particulate toner core from raw fly ash
JPH02167577A (en) * 1989-11-13 1990-06-27 Konica Corp Color image forming method

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58144839A (en) * 1982-02-13 1983-08-29 Tdk Corp Magnetic carrier particles
WO1984001837A1 (en) * 1982-11-08 1984-05-10 Eastman Kodak Co Electrographic developer composition and method for using the same
FR2535863A1 (en) * 1982-11-08 1984-05-11 Eastman Kodak Co ELECTROGRAPHIC DEVELOPER AND METHOD FOR DEVELOPING ELECTROGRAPHIC IMAGE USING THE SAME
JPS59111927A (en) * 1982-12-15 1984-06-28 Hitachi Metals Ltd Ferrite carrier for electrophotography
JPS59139056A (en) * 1983-01-31 1984-08-09 Mita Ind Co Ltd Magnetic brush developing method
JPH05705B2 (en) * 1983-03-23 1993-01-06 Mita Industrial Co Ltd
JPS59172660A (en) * 1983-03-23 1984-09-29 Mita Ind Co Ltd Magnetic brush developing method using ferrite carrier
JPS6138954A (en) * 1984-07-31 1986-02-25 Mita Ind Co Ltd Electrophotographic method
JPH053588B2 (en) * 1984-07-31 1993-01-18 Mita Industrial Co Ltd
US4698289A (en) * 1984-08-15 1987-10-06 Halomet Inc. Process for making ferrite spherical particulate toner core from raw fly ash
US4592988A (en) * 1984-08-15 1986-06-03 Halomet, Inc. Ferrite toner carrier core composition derived from fly ash
JPS6244752A (en) * 1985-08-23 1987-02-26 Fujitsu Ltd Developer composition
JPH0658546B2 (en) * 1985-08-23 1994-08-03 富士通株式会社 Developer composition
JPH02167577A (en) * 1989-11-13 1990-06-27 Konica Corp Color image forming method
JPH0468630B2 (en) * 1989-11-13 1992-11-02 Konishiroku Photo Ind

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