JPS5559475A - Developing electrostatic field control unit of wet type electrophotography - Google Patents
Developing electrostatic field control unit of wet type electrophotographyInfo
- Publication number
- JPS5559475A JPS5559475A JP13239578A JP13239578A JPS5559475A JP S5559475 A JPS5559475 A JP S5559475A JP 13239578 A JP13239578 A JP 13239578A JP 13239578 A JP13239578 A JP 13239578A JP S5559475 A JPS5559475 A JP S5559475A
- Authority
- JP
- Japan
- Prior art keywords
- developing
- developing solution
- bias voltage
- deterioration
- electrostatic field
- 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
- Control Or Security For Electrophotography (AREA)
- Developing For Electrophotography (AREA)
- Wet Developing In Electrophotography (AREA)
Abstract
PURPOSE: To maintain image density always constant by performing developing electrostatic field controlling according to the extent of deterioration of developing solution.
CONSTITUTION: Electrodes 4 for detecting electrodeposition current of developing solution are disposed in a developing solution tank 5 and are connected to a developing electrode 8 by way of a current detecting circuit 6 and bias voltage generating circuit 7. Then, when the developing solution deteriorates upon long-term use and non-charged toner increases in the developer, the electrodeposition current flowing in the electrodes 4 decrease in proportion to the deterioration and is detected by the current detcting circuit 6. This detection output is applied to a bias voltage generating circuit 7, by which the bias voltage of the developing electrode 8 is controlled, thus the decrease in the image density owing to the deterioration of the developing solution is corrcted by the bias voltage increase of the developing electrode 8.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13239578A JPS5559475A (en) | 1978-10-27 | 1978-10-27 | Developing electrostatic field control unit of wet type electrophotography |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13239578A JPS5559475A (en) | 1978-10-27 | 1978-10-27 | Developing electrostatic field control unit of wet type electrophotography |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5559475A true JPS5559475A (en) | 1980-05-02 |
Family
ID=15080378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13239578A Pending JPS5559475A (en) | 1978-10-27 | 1978-10-27 | Developing electrostatic field control unit of wet type electrophotography |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5559475A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5995778A (en) * | 1997-08-08 | 1999-11-30 | Nec Corporation | Apparatus and method for detecting toner density in a liquid developer |
| US6055387A (en) * | 1998-06-01 | 2000-04-25 | Nec Corporation | Device and method for electrophotographic image generation |
| US6330406B1 (en) | 1998-08-07 | 2001-12-11 | Nec Corporation | Toner concentration detecting apparatus including power supply for applying reversible voltage to the toner |
-
1978
- 1978-10-27 JP JP13239578A patent/JPS5559475A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5995778A (en) * | 1997-08-08 | 1999-11-30 | Nec Corporation | Apparatus and method for detecting toner density in a liquid developer |
| US6055387A (en) * | 1998-06-01 | 2000-04-25 | Nec Corporation | Device and method for electrophotographic image generation |
| US6330406B1 (en) | 1998-08-07 | 2001-12-11 | Nec Corporation | Toner concentration detecting apparatus including power supply for applying reversible voltage to the toner |
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