JPS5545086A - Two color developing unit having automatic fog prevention function - Google Patents
Two color developing unit having automatic fog prevention functionInfo
- Publication number
- JPS5545086A JPS5545086A JP11961678A JP11961678A JPS5545086A JP S5545086 A JPS5545086 A JP S5545086A JP 11961678 A JP11961678 A JP 11961678A JP 11961678 A JP11961678 A JP 11961678A JP S5545086 A JPS5545086 A JP S5545086A
- Authority
- JP
- Japan
- Prior art keywords
- color
- toner
- background
- developing unit
- static latent
- 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
Links
Abstract
PURPOSE: To automatically reduce fog on the background of an electro-static latent image, by carrying out bias control so as to keep the ratio of 2-color toner attachment amounts constant according to the output obtained by detecting the toner attachment amounts on the background.
CONSTITUTION: Two kinds of positive and negative static latent images on image bearing medium 1 are developed with 2-color developing unit 3 using toners different from each other in polarity and color to form a 2-color image. The attachment amounts of positive and negative toner particles attached to the background or the similar part after development of the static latent image are detected with detection means 4, respectively. The ratio of the attached toners is adjusted to a predetermined value or the weight of each attached toner is regulated to zero by controlling development bias application means 6 by controller 5.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11961678A JPS5545086A (en) | 1978-09-27 | 1978-09-27 | Two color developing unit having automatic fog prevention function |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11961678A JPS5545086A (en) | 1978-09-27 | 1978-09-27 | Two color developing unit having automatic fog prevention function |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5545086A true JPS5545086A (en) | 1980-03-29 |
Family
ID=14765824
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11961678A Pending JPS5545086A (en) | 1978-09-27 | 1978-09-27 | Two color developing unit having automatic fog prevention function |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5545086A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61117572A (en) * | 1984-11-13 | 1986-06-04 | Canon Inc | Electrophotographic device |
US5610217A (en) * | 1994-10-31 | 1997-03-11 | The Gates Corporation | Ethylene-alpha-olefin belting |
-
1978
- 1978-09-27 JP JP11961678A patent/JPS5545086A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61117572A (en) * | 1984-11-13 | 1986-06-04 | Canon Inc | Electrophotographic device |
JPH0574823B2 (en) * | 1984-11-13 | 1993-10-19 | Canon Kk | |
US5610217A (en) * | 1994-10-31 | 1997-03-11 | The Gates Corporation | Ethylene-alpha-olefin belting |
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