JPS5639570A - Picture density control method - Google Patents
Picture density control methodInfo
- Publication number
- JPS5639570A JPS5639570A JP15652979A JP15652979A JPS5639570A JP S5639570 A JPS5639570 A JP S5639570A JP 15652979 A JP15652979 A JP 15652979A JP 15652979 A JP15652979 A JP 15652979A JP S5639570 A JPS5639570 A JP S5639570A
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- concentration
- measurement
- operational amplifier
- inputted
- 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
- Wet Developing In Electrophotography (AREA)
Abstract
PURPOSE: To obtain invariably constant picture density and also to improve the efficiency of a maintenance check, etc., by measuring the electric resistance of a developer and by holding liquid concentration on the basis of the measurement result according to the program of liquid transmissivity.
CONSTITUTION: For a measurement of liquid concentration, change-over switches SW1WSW4 are placed as shown in the figure. In this case, lamp 3 is turned on and the quantity of light transmitted in electrolyte 2 is detected by CdS element 4 and inputted to operational amplifier 5. With the arithmetic output of amplifier 5, transistors Q1 and Q2 are put into operation to drive solenoid 6, which turns on lamp 7. As solenoid 6 is driven, toner passage 6A is opened to dischrge toner 9 in tank 8 into electrolyte 2. According to an increase in electrolytic concentration, the output of operational amplifier 5 is cut off to cut off control over the liquid concentration. For a measurement or liquid resistance, change-over switches SW1W SW4 placed at the opposite sides to the positions in the figure to turn off CdS element 4 and the liquid resistance measurement voltage of electrode plate 1 is inputted to operational amplifier 5, thereby exercising concentration control with its arithmetic output.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15652979A JPS5639570A (en) | 1979-12-03 | 1979-12-03 | Picture density control method |
| US06/181,609 US4310238A (en) | 1979-09-08 | 1980-08-27 | Electrostatic copying apparatus |
| DE3033695A DE3033695C2 (en) | 1979-09-08 | 1980-09-08 | Control device for the toner concentration of the developer in an electrostatic copier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15652979A JPS5639570A (en) | 1979-12-03 | 1979-12-03 | Picture density control method |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11555579A Division JPS5639569A (en) | 1979-09-08 | 1979-09-08 | Picture density control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5639570A true JPS5639570A (en) | 1981-04-15 |
Family
ID=15629776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15652979A Pending JPS5639570A (en) | 1979-09-08 | 1979-12-03 | Picture density control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5639570A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5859403A (en) * | 1981-09-04 | 1983-04-08 | アセア・アクチ−ボラグ | Arc and fire detector |
| US5995778A (en) * | 1997-08-08 | 1999-11-30 | Nec Corporation | Apparatus and method for detecting toner density in a liquid developer |
-
1979
- 1979-12-03 JP JP15652979A patent/JPS5639570A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5859403A (en) * | 1981-09-04 | 1983-04-08 | アセア・アクチ−ボラグ | Arc and fire detector |
| JPH0440682B2 (en) * | 1981-09-04 | 1992-07-03 | Asea Brown Boveri | |
| US5995778A (en) * | 1997-08-08 | 1999-11-30 | Nec Corporation | Apparatus and method for detecting toner density in a liquid developer |
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