JPS55159456A - Two-color image developing method - Google Patents
Two-color image developing methodInfo
- Publication number
- JPS55159456A JPS55159456A JP6791979A JP6791979A JPS55159456A JP S55159456 A JPS55159456 A JP S55159456A JP 6791979 A JP6791979 A JP 6791979A JP 6791979 A JP6791979 A JP 6791979A JP S55159456 A JPS55159456 A JP S55159456A
- Authority
- JP
- Japan
- Prior art keywords
- color
- ground part
- toners
- magnetic brush
- brush development
- 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
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
PURPOSE: To obtain good-quality two-color images by making the potential of the ground part to the same polarity as that of the toners used in the second magnetic brush development and increasing the toner mixing ratio of the second magnetic brush development in the electrostatic latent image forming process.
CONSTITUTION: A photosensitive drum 1 is so charged that the red-color part and ground part potentials VR, VG of the photoreceptor surface become negative and |VR|>|VG| and the black-color part potential V13 becomes positive. The absolute value of developing bias is made slightly higher with |VG|in the 1st brush development, thence the positive-charged toners TR develop only the electrostatic latent images corresponding to the red-color part excluding the ground part. Even if the toner mixing ratio of the negative-charged black-and-white toners TB is increased in the second magnetic brush development, the ground part is of negative potential and therefore staining of the ground part by the black-color toners TB does not occur, hence the rubbing force of the magnetic brush may be weakened by increasing the toner mixing ratio and the damaging of the already developed images may be obviated.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6791979A JPS55159456A (en) | 1979-05-31 | 1979-05-31 | Two-color image developing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6791979A JPS55159456A (en) | 1979-05-31 | 1979-05-31 | Two-color image developing method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55159456A true JPS55159456A (en) | 1980-12-11 |
Family
ID=13358790
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6791979A Pending JPS55159456A (en) | 1979-05-31 | 1979-05-31 | Two-color image developing method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55159456A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57188061A (en) * | 1981-05-15 | 1982-11-18 | Hitachi Ltd | Electrophotographing device |
-
1979
- 1979-05-31 JP JP6791979A patent/JPS55159456A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57188061A (en) * | 1981-05-15 | 1982-11-18 | Hitachi Ltd | Electrophotographing device |
JPS6356542B2 (en) * | 1981-05-15 | 1988-11-08 | Hitachi Ltd |
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