JPS54161940A - Method and apparatus for detecting toner concentration in electrophotographic copier - Google Patents
Method and apparatus for detecting toner concentration in electrophotographic copierInfo
- Publication number
- JPS54161940A JPS54161940A JP6992978A JP6992978A JPS54161940A JP S54161940 A JPS54161940 A JP S54161940A JP 6992978 A JP6992978 A JP 6992978A JP 6992978 A JP6992978 A JP 6992978A JP S54161940 A JPS54161940 A JP S54161940A
- Authority
- JP
- Japan
- Prior art keywords
- light
- developer
- toner concentration
- carrier
- reflected light
- 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.)
- Granted
Links
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
PURPOSE:To enable accurate detection of toner concentration according to reflection intensity of a specified wavelength light from a developer by utilizing the fact that the carrier in the developer exhibits always constant reflectivity in the specified wavelength light. CONSTITUTION:A light from light emitting station 3b irradiates developer d through transparent plate 3a in toner concentration detector 3 arranged in the bottom of developer tank 21, and this reflected light is received by light receiving station 3c. The spectral curves of the reflected light from the carrier of developer before use and that from the carrier approach each other or intersect each other, and the light having the wavelengths of these intersection point A or B or near A or B is used and the reflected light of this light from the developer is received to detect toner concentration. As a result, the toner concentration is accurately measured without being affected by deterioration of the developer by selecting such wavelengths.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6992978A JPS54161940A (en) | 1978-06-12 | 1978-06-12 | Method and apparatus for detecting toner concentration 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 |
---|---|---|---|
JP6992978A JPS54161940A (en) | 1978-06-12 | 1978-06-12 | Method and apparatus for detecting toner concentration in electrophotographic copier |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54161940A true JPS54161940A (en) | 1979-12-22 |
JPS6211299B2 JPS6211299B2 (en) | 1987-03-11 |
Family
ID=13416853
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6992978A Granted JPS54161940A (en) | 1978-06-12 | 1978-06-12 | Method and apparatus for detecting toner concentration in electrophotographic copier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54161940A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4551002A (en) * | 1983-10-04 | 1985-11-05 | Fuji Xerox Co., Ltd. | Developer density detecting apparatus |
JPH01202642A (en) * | 1988-02-09 | 1989-08-15 | Canon Inc | Measuring apparatus |
-
1978
- 1978-06-12 JP JP6992978A patent/JPS54161940A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4551002A (en) * | 1983-10-04 | 1985-11-05 | Fuji Xerox Co., Ltd. | Developer density detecting apparatus |
JPH01202642A (en) * | 1988-02-09 | 1989-08-15 | Canon Inc | Measuring apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPS6211299B2 (en) | 1987-03-11 |
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