JPS54138439A - Two-color developing method - Google Patents
Two-color developing methodInfo
- Publication number
- JPS54138439A JPS54138439A JP4518778A JP4518778A JPS54138439A JP S54138439 A JPS54138439 A JP S54138439A JP 4518778 A JP4518778 A JP 4518778A JP 4518778 A JP4518778 A JP 4518778A JP S54138439 A JPS54138439 A JP S54138439A
- Authority
- JP
- Japan
- Prior art keywords
- biasing
- high frequency
- latent image
- bias voltage
- frequency bias
- 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 form high concentration picture image without ground soiling, by DC-biasing the high frequency bias voltage applied to the development section, at the time of monochromatic development, in a two-color developing apparatus using two kinds of toner.
CONSTITUTION: A high frequency bias voltage 4 which is usually applied as shown in diagram A with respect to an electrostatic latent image 3 is deflected, for instance, to - side by the quantity of DC biasing 5 as shown in diagram B, and is applied as bias voltage 4'. Thus, monochromatic development may be achieved by using the + side latent image potential of the electrostatic latent image 3. It is preferable to set the quantity of DC biasing 5 mentioned above so that the - side pulse height of the high frequency bias voltage 4' be equal or superior to the level of the - side potential of the electrostatic latent image 3. In order to apply said the abovementioned DC biasing, meanwhile, a direct-current power source may be connected in series between development section 1 and high frequency bias power source 2, or a circuit 8 having parallel connection of varistor 6 and diode 7 may be connected in series between 1 and 2 as shown in diagram C.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4518778A JPS54138439A (en) | 1978-04-19 | 1978-04-19 | Two-color developing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4518778A JPS54138439A (en) | 1978-04-19 | 1978-04-19 | Two-color developing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54138439A true JPS54138439A (en) | 1979-10-26 |
Family
ID=12712258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4518778A Pending JPS54138439A (en) | 1978-04-19 | 1978-04-19 | Two-color developing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54138439A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56144452A (en) * | 1980-04-14 | 1981-11-10 | Hitachi Ltd | Electrophotographic recorder |
| JPS5778572A (en) * | 1980-11-05 | 1982-05-17 | Ricoh Co Ltd | Double-color developing method |
| US5079114A (en) * | 1989-11-22 | 1992-01-07 | Xerox Corporation | Biasing switching between tri-level and bi-level development |
| US5080988A (en) * | 1989-11-22 | 1992-01-14 | Xerox Corporation | Biasing scheme for improving latitudes in the tri-level xerographic process |
-
1978
- 1978-04-19 JP JP4518778A patent/JPS54138439A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56144452A (en) * | 1980-04-14 | 1981-11-10 | Hitachi Ltd | Electrophotographic recorder |
| JPH024903B2 (en) * | 1980-04-14 | 1990-01-30 | Hitachi Ltd | |
| JPS5778572A (en) * | 1980-11-05 | 1982-05-17 | Ricoh Co Ltd | Double-color developing method |
| US5079114A (en) * | 1989-11-22 | 1992-01-07 | Xerox Corporation | Biasing switching between tri-level and bi-level development |
| US5080988A (en) * | 1989-11-22 | 1992-01-14 | Xerox Corporation | Biasing scheme for improving latitudes in the tri-level xerographic process |
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