JPS54161941A - Toner concentration detecting method in electrophotographic copier - Google Patents
Toner concentration detecting method in electrophotographic copierInfo
- Publication number
- JPS54161941A JPS54161941A JP6993078A JP6993078A JPS54161941A JP S54161941 A JPS54161941 A JP S54161941A JP 6993078 A JP6993078 A JP 6993078A JP 6993078 A JP6993078 A JP 6993078A JP S54161941 A JPS54161941 A JP S54161941A
- Authority
- JP
- Japan
- Prior art keywords
- toner concentration
- light
- curve
- station
- developer
- 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
- Dry Development In Electrophotography (AREA)
Abstract
PURPOSE:To enable accurate toner concentration control, by limiting the wavelength region of the light to be received reflected from a developer to steepen change of reflection light intensity against toner concentration. CONSTITUTION:Developer d is irradiated with light from light emitting station 3b through transparent plate 3a arranged in the bottom of developer tank 21, and the reflected light is received with photodetector 3c. When filter 3d intercepting the wavelength region of 700 to 1200 nm is fixed on the light path between photodetector 3 and station 3b using an incandescent lamp in station 3b, the obtained reflection light intensity curve becomes by far steeper, such as curve b than the curve conventionally obtained without any filter, such as curve a, and even when set reflection intensity R2 varies by apparent width r2, the variation width of toner concentration falls to d2, and deviation from correct toner concentration D becomes comparatively smaller, thus permitting accurate concentration control to be carried out.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6993078A JPS54161941A (en) | 1978-06-12 | 1978-06-12 | Toner concentration detecting method in electrophotographic copier |
US06/045,759 US4273843A (en) | 1978-06-12 | 1979-06-05 | Method of detecting toner concentration in electrophotographic copying machine |
DE2923806A DE2923806C2 (en) | 1978-06-12 | 1979-06-12 | Device for determining the toner concentration in electrophotographic copiers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6993078A JPS54161941A (en) | 1978-06-12 | 1978-06-12 | Toner concentration detecting method in electrophotographic copier |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54161941A true JPS54161941A (en) | 1979-12-22 |
Family
ID=13416878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6993078A Pending JPS54161941A (en) | 1978-06-12 | 1978-06-12 | Toner concentration detecting method in electrophotographic copier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54161941A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63177172A (en) * | 1987-01-19 | 1988-07-21 | Canon Inc | Developing device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53107853A (en) * | 1977-03-02 | 1978-09-20 | Canon Inc | Concentration detection method of developer |
-
1978
- 1978-06-12 JP JP6993078A patent/JPS54161941A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53107853A (en) * | 1977-03-02 | 1978-09-20 | Canon Inc | Concentration detection method of developer |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63177172A (en) * | 1987-01-19 | 1988-07-21 | Canon Inc | Developing device |
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