JPS5538538A - Developing method in two color electrophotographic copying system - Google Patents

Developing method in two color electrophotographic copying system

Info

Publication number
JPS5538538A
JPS5538538A JP11153078A JP11153078A JPS5538538A JP S5538538 A JPS5538538 A JP S5538538A JP 11153078 A JP11153078 A JP 11153078A JP 11153078 A JP11153078 A JP 11153078A JP S5538538 A JPS5538538 A JP S5538538A
Authority
JP
Japan
Prior art keywords
red color
edge effect
images
charging
color
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.)
Granted
Application number
JP11153078A
Other languages
Japanese (ja)
Other versions
JPS6262349B2 (en
Inventor
Fuyuhiko Matsumoto
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 JP11153078A priority Critical patent/JPS5538538A/en
Publication of JPS5538538A publication Critical patent/JPS5538538A/en
Publication of JPS6262349B2 publication Critical patent/JPS6262349B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Magnetic Brush Developing In Electrophotography (AREA)

Abstract

PURPOSE: To eliminate edge effect in black color images and achieve higher quality by letting the developer used for development of red color images be of two component system and regulating the quantity of charging of the toner in this developer.
CONSTITUTION: In copying images of red and black 2 colors by a two color electrophotographic copying system, edge effect appears in the black color images and lowers image quality depending upon the value of the quantity of charging of red color toner. Namely, a red color edging is produced through a white ground part W around the black color images B on the two color copies. Thereupon, when the quantity of charging of the red color toner is changed, the edge effect decreases with an increase in said quantity and at above a certain value, no edge effect is produced at all any more. When it is increased further, the density of the red color visible images gradually decreases. Hence, no edge effect is produced and if such a charging region of the red color toner where the image density of the red color visible images is sufficient is selected and copying is done at the charging quantity of the red color toner within this range, the production of the edge effect may be prevented.
COPYRIGHT: (C)1980,JPO&Japio
JP11153078A 1978-09-11 1978-09-11 Developing method in two color electrophotographic copying system Granted JPS5538538A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11153078A JPS5538538A (en) 1978-09-11 1978-09-11 Developing method in two color electrophotographic copying system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11153078A JPS5538538A (en) 1978-09-11 1978-09-11 Developing method in two color electrophotographic copying system

Publications (2)

Publication Number Publication Date
JPS5538538A true JPS5538538A (en) 1980-03-18
JPS6262349B2 JPS6262349B2 (en) 1987-12-25

Family

ID=14563669

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11153078A Granted JPS5538538A (en) 1978-09-11 1978-09-11 Developing method in two color electrophotographic copying system

Country Status (1)

Country Link
JP (1) JPS5538538A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5720744A (en) * 1980-07-15 1982-02-03 Hitachi Ltd Method for dichromic electrophotography
US4594302A (en) * 1984-05-31 1986-06-10 Mita Industrial Co., Ltd. Developing process for two-colored electrophotography

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5720744A (en) * 1980-07-15 1982-02-03 Hitachi Ltd Method for dichromic electrophotography
US4594302A (en) * 1984-05-31 1986-06-10 Mita Industrial Co., Ltd. Developing process for two-colored electrophotography

Also Published As

Publication number Publication date
JPS6262349B2 (en) 1987-12-25

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