JPS56104337A - Developing method in two color copying system - Google Patents

Developing method in two color copying system

Info

Publication number
JPS56104337A
JPS56104337A JP758880A JP758880A JPS56104337A JP S56104337 A JPS56104337 A JP S56104337A JP 758880 A JP758880 A JP 758880A JP 758880 A JP758880 A JP 758880A JP S56104337 A JPS56104337 A JP S56104337A
Authority
JP
Japan
Prior art keywords
toner
latent image
tbl
developed
edge effect
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
JP758880A
Other languages
Japanese (ja)
Inventor
Fuyuhiko Matsumoto
Shuichi Tsushima
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 JP758880A priority Critical patent/JPS56104337A/en
Publication of JPS56104337A publication Critical patent/JPS56104337A/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
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/01—Electrographic processes using a charge pattern for multicoloured copies

Abstract

PURPOSE:To prevent defects due to the edge effect of a toner image, by rendering volume resistivity of the magnetic powder carrier of the first toner different from that of the second toner in developing static latent images different from each other in polarity on a latent image bearing body with 2 color toners different from each other in charge polarity. CONSTITUTION:For example, a negative latent image on the surface of photoreceptor 1 as a latent image bearing body is developed with black toner TBL, and a positive latent image with red toner TR. When the latent image is developed with the first toner TR and then, the other latent image is developed with the second toner TBL, red border R1 occurs around black image BL1 with white ground W1 between them on account of the edge effect. In order to prevent border R1, volume resistivity of a magnetic powder carrier used with toner TBL is made in 10<5>- 10<8>OMEGAcm, and that of the carrier used with toner TR is made in 10<10>-10<11>OMEGAcm. As a result, it is prevented that the latent image to be developed with toner TBL causes charge leakage due to the carrier of toner TR, and undergoes deformation, thus permitting the edge effect to be prevented.
JP758880A 1980-01-25 1980-01-25 Developing method in two color copying system Pending JPS56104337A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP758880A JPS56104337A (en) 1980-01-25 1980-01-25 Developing method in two color copying system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP758880A JPS56104337A (en) 1980-01-25 1980-01-25 Developing method in two color copying system

Publications (1)

Publication Number Publication Date
JPS56104337A true JPS56104337A (en) 1981-08-20

Family

ID=11669967

Family Applications (1)

Application Number Title Priority Date Filing Date
JP758880A Pending JPS56104337A (en) 1980-01-25 1980-01-25 Developing method in two color copying system

Country Status (1)

Country Link
JP (1) JPS56104337A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60252369A (en) * 1984-05-29 1985-12-13 Japan Steel Works Ltd:The Developing method of two-color electrophotographic device
US4594302A (en) * 1984-05-31 1986-06-10 Mita Industrial Co., Ltd. Developing process for two-colored electrophotography
JPH02167577A (en) * 1989-11-13 1990-06-27 Konica Corp Color image forming method
JPH02213855A (en) * 1989-02-14 1990-08-24 Sharp Corp Full-color developer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60252369A (en) * 1984-05-29 1985-12-13 Japan Steel Works Ltd:The Developing method of two-color electrophotographic device
US4594302A (en) * 1984-05-31 1986-06-10 Mita Industrial Co., Ltd. Developing process for two-colored electrophotography
JPH02213855A (en) * 1989-02-14 1990-08-24 Sharp Corp Full-color developer
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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