JPS57190973A - Controller of toner concentration - Google Patents
Controller of toner concentrationInfo
- Publication number
- JPS57190973A JPS57190973A JP7498881A JP7498881A JPS57190973A JP S57190973 A JPS57190973 A JP S57190973A JP 7498881 A JP7498881 A JP 7498881A JP 7498881 A JP7498881 A JP 7498881A JP S57190973 A JPS57190973 A JP S57190973A
- Authority
- JP
- Japan
- Prior art keywords
- concentration
- toner
- signal
- supply
- deltac
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
- G03G15/0849—Detection or control means for the developer concentration
- G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
PURPOSE:To ensure the optimum supply of toner regardless of the type of the original, the number of continuously copied sheets, etc., by multiplying the difference value between the standard concentration and the detected concentration by its corresponding coefficient, then supplying the toner according to the value obtained from the above multiplication. CONSTITUTION:The signal corresponding to a standard concentration plate or the concentration of the developer detected at a toner concentration detecting part 9 is amplified by an amplifier 10 containing an arithmetic amplifier 10a and fed to an A/D converter 11 after receiving a level adjustment at a volume VR1. This signal is sampled with the prescribed timing and by the sampling signal emerging on a signal line C. The sampled signal is fetched into a CPU13 after an A/D conversion and receives an arithmetic process based on a program within an ROM15. Thus the supply time of the toner is decided. The amount of supply RT is decided as RT=KXDELTAC (DELTAC: difference of concentration), where K is 0.8, 1, 1.2, 1.4 and 1.6 when DELTAC is <=1%, 1-2%, 2-3%, 3-4% and >=4% respectively.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7498881A JPS57190973A (en) | 1981-05-20 | 1981-05-20 | Controller of toner concentration |
US06/378,008 US4462680A (en) | 1981-05-20 | 1982-05-13 | Apparatus for controlling toner density |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7498881A JPS57190973A (en) | 1981-05-20 | 1981-05-20 | Controller of toner concentration |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57190973A true JPS57190973A (en) | 1982-11-24 |
Family
ID=13563161
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7498881A Pending JPS57190973A (en) | 1981-05-20 | 1981-05-20 | Controller of toner concentration |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57190973A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6243674A (en) * | 1985-08-20 | 1987-02-25 | Sanyo Electric Co Ltd | Electronic copying machine |
JPS63177173A (en) * | 1987-01-19 | 1988-07-21 | Canon Inc | Developing device |
US4883019A (en) * | 1987-01-19 | 1989-11-28 | Canon Kabushiki Kaisha | Image forming apparatus having developer content detector |
US5523832A (en) * | 1992-05-29 | 1996-06-04 | Minolta Camera Kabushiki Kaisha | Electrophotographic image forming apparatus with controlled mixing of developer |
-
1981
- 1981-05-20 JP JP7498881A patent/JPS57190973A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6243674A (en) * | 1985-08-20 | 1987-02-25 | Sanyo Electric Co Ltd | Electronic copying machine |
JPS63177173A (en) * | 1987-01-19 | 1988-07-21 | Canon Inc | Developing device |
US4883019A (en) * | 1987-01-19 | 1989-11-28 | Canon Kabushiki Kaisha | Image forming apparatus having developer content detector |
US5523832A (en) * | 1992-05-29 | 1996-06-04 | Minolta Camera Kabushiki Kaisha | Electrophotographic image forming apparatus with controlled mixing of developer |
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