JPS5651646A - Toner concentration sensor - Google Patents
Toner concentration sensorInfo
- Publication number
- JPS5651646A JPS5651646A JP12701179A JP12701179A JPS5651646A JP S5651646 A JPS5651646 A JP S5651646A JP 12701179 A JP12701179 A JP 12701179A JP 12701179 A JP12701179 A JP 12701179A JP S5651646 A JPS5651646 A JP S5651646A
- Authority
- JP
- Japan
- Prior art keywords
- light
- toner concentration
- photodetector
- quantity compensating
- concentration sensor
- 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
- Investigating Or Analysing Materials By Optical Means (AREA)
- Dry Development In Electrophotography (AREA)
Abstract
PURPOSE:To reduce malfunctions by providing an optical-path splitting member and light-quantity compensating photodetector. CONSTITUTION:Either of side walls 224 of guide path 223 for developer A is made into a transparent glass plate 224 (G) functioning as the optical-path splitting member of toner concentration sensor 3, and for light source 4 main photodetector 5 and light-quantity compensating photodetector 6 are provided. Consequently, part of light L emitted from light source 4 to measurement position B becomes illumination light L1, with which developer A is irradiated. While its reflected light L2 is made incident on main photodetector 5, part of it is positively reflected on the surface of glass plate 224 (G). The positive reflected light L3 is made incident on light-quantity compensating photodetector 6 and outputs of both photodetectors 5 and 6 are compared mutually and decided by toner concentration control circuit 51 to detect accurate toner concentration.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12701179A JPS5651646A (en) | 1979-10-02 | 1979-10-02 | Toner concentration sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12701179A JPS5651646A (en) | 1979-10-02 | 1979-10-02 | Toner concentration sensor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5651646A true JPS5651646A (en) | 1981-05-09 |
Family
ID=14949469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12701179A Pending JPS5651646A (en) | 1979-10-02 | 1979-10-02 | Toner concentration sensor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5651646A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62209476A (en) * | 1986-03-10 | 1987-09-14 | Minolta Camera Co Ltd | Image density control method for electrophotographic copying machine |
JPS6413171A (en) * | 1987-07-07 | 1989-01-18 | Canon Kk | Toner density detector |
JPH0396834A (en) * | 1989-09-08 | 1991-04-22 | Takagi Ind Co Ltd | Concentration measuring instrument |
JPH0396839A (en) * | 1989-09-08 | 1991-04-22 | Takagi Ind Co Ltd | Concentration measuring instrument |
-
1979
- 1979-10-02 JP JP12701179A patent/JPS5651646A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62209476A (en) * | 1986-03-10 | 1987-09-14 | Minolta Camera Co Ltd | Image density control method for electrophotographic copying machine |
JPS6413171A (en) * | 1987-07-07 | 1989-01-18 | Canon Kk | Toner density detector |
JPH0396834A (en) * | 1989-09-08 | 1991-04-22 | Takagi Ind Co Ltd | Concentration measuring instrument |
JPH0396839A (en) * | 1989-09-08 | 1991-04-22 | Takagi Ind Co Ltd | Concentration measuring instrument |
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