JPS5639554A - Original density measuring method - Google Patents
Original density measuring methodInfo
- Publication number
- JPS5639554A JPS5639554A JP11496479A JP11496479A JPS5639554A JP S5639554 A JPS5639554 A JP S5639554A JP 11496479 A JP11496479 A JP 11496479A JP 11496479 A JP11496479 A JP 11496479A JP S5639554 A JPS5639554 A JP S5639554A
- Authority
- JP
- Japan
- Prior art keywords
- original
- cover
- range
- photocoupler
- wavelength region
- 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
- 230000003595 spectral effect Effects 0.000 abstract 4
- 238000002310 reflectometry Methods 0.000 abstract 3
- 238000001514 detection method Methods 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 abstract 1
- 108091008695 photoreceptors Proteins 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
Landscapes
- Holders For Sensitive Materials And Originals (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Control Of Exposure In Printing And Copying (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
PURPOSE:To enable automation of adequate exposure in electrophotography, by discriminating an original from an original cover with a light in the wavelength region where the spectral reflectivity of the cover is low in order to detect original density in the wavelength region in which a photoreceptor has spectral sensitivity. CONSTITUTION:White background original 3 having a spectral reflectivity as shown by C is interposed between original platen 1 made of transparent glass and original cover 2 having a spectral reflectivity as shown by B. Photocoupler (an optical detector of density) 4 composed of light emission element 4a and photodetector 4b is reciprocably mounted along platen 1. The wavelength region of photocoupler 4 is shown by D. The output signal of photocoupler 4 remarkably changes between the range of l-m where original 3 is placed, and the range except this, so the range of original 3 is optically discriminated from cover 2, and the range of l-m is extracted as the density detection area of original 3, and necessary exposure control is made.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11496479A JPS5639554A (en) | 1979-09-07 | 1979-09-07 | Original density measuring method |
US06/183,408 US4341460A (en) | 1979-09-07 | 1980-09-03 | Electronic copying machine |
DE3033524A DE3033524C2 (en) | 1979-09-07 | 1980-09-05 | Electrostatic copier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11496479A JPS5639554A (en) | 1979-09-07 | 1979-09-07 | Original density measuring method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5639554A true JPS5639554A (en) | 1981-04-15 |
JPS643246B2 JPS643246B2 (en) | 1989-01-20 |
Family
ID=14650984
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11496479A Granted JPS5639554A (en) | 1979-09-07 | 1979-09-07 | Original density measuring method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5639554A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5942551A (en) * | 1982-09-03 | 1984-03-09 | Canon Inc | Image forming device |
JPS59123835A (en) * | 1982-12-29 | 1984-07-17 | Canon Inc | Copying device |
JPS59142573A (en) * | 1983-02-03 | 1984-08-15 | Canon Inc | Image forming device |
JPS59211032A (en) * | 1983-05-16 | 1984-11-29 | Konishiroku Photo Ind Co Ltd | Method and device for detecting original density of copying machine |
JPS61148070U (en) * | 1985-03-06 | 1986-09-12 | ||
JPS628133A (en) * | 1985-07-05 | 1987-01-16 | Fuji Photo Film Co Ltd | Photographic printing device |
US4858879A (en) * | 1987-07-07 | 1989-08-22 | Honda Giken Kogyo Kabushiki Kaisha | Mount |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5042856A (en) * | 1973-05-23 | 1975-04-18 | ||
JPS5622424A (en) * | 1979-08-01 | 1981-03-03 | Konishiroku Photo Ind Co Ltd | Original size detecting unit of copying machine |
-
1979
- 1979-09-07 JP JP11496479A patent/JPS5639554A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5042856A (en) * | 1973-05-23 | 1975-04-18 | ||
JPS5622424A (en) * | 1979-08-01 | 1981-03-03 | Konishiroku Photo Ind Co Ltd | Original size detecting unit of copying machine |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5942551A (en) * | 1982-09-03 | 1984-03-09 | Canon Inc | Image forming device |
JPS59123835A (en) * | 1982-12-29 | 1984-07-17 | Canon Inc | Copying device |
JPS59142573A (en) * | 1983-02-03 | 1984-08-15 | Canon Inc | Image forming device |
JPH0610722B2 (en) * | 1983-02-03 | 1994-02-09 | キヤノン株式会社 | Reader printer |
JPS59211032A (en) * | 1983-05-16 | 1984-11-29 | Konishiroku Photo Ind Co Ltd | Method and device for detecting original density of copying machine |
JPS61148070U (en) * | 1985-03-06 | 1986-09-12 | ||
JPS628133A (en) * | 1985-07-05 | 1987-01-16 | Fuji Photo Film Co Ltd | Photographic printing device |
US4858879A (en) * | 1987-07-07 | 1989-08-22 | Honda Giken Kogyo Kabushiki Kaisha | Mount |
Also Published As
Publication number | Publication date |
---|---|
JPS643246B2 (en) | 1989-01-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0360126A3 (en) | Operation method for an optical smoke detector and smoke detector for carrying out the method | |
JPS5639554A (en) | Original density measuring method | |
JPS5639555A (en) | Original discrimination method | |
JPS5742842A (en) | Photoelectric smoke sensor | |
US3653772A (en) | Two lamp light comparison type densitometer | |
JPS5651646A (en) | Toner concentration sensor | |
JPS5739306A (en) | Shape detector | |
JPS5488118A (en) | Control device for light amount of copier | |
JPS5720603A (en) | Detector for plate width using laser | |
JPS57196137A (en) | Measuring device for photo luminescence intensity | |
JPS5690227A (en) | Optical fiber temperature detector | |
JPS5711572A (en) | Beam recorder | |
JPS55117945A (en) | Defect detection unit | |
JPS575179A (en) | Optical character reader | |
JPS5462879A (en) | Optical temperature detector | |
JPS57161624A (en) | Optical temperature sensor | |
JPS54139778A (en) | Photosensor | |
SU951087A1 (en) | Device for measuring temperature | |
JPS57132078A (en) | 2-dimensional radiation detector | |
JPS57103020A (en) | Spectrophotometer | |
JPS5765059A (en) | Original reader | |
JPS5763426A (en) | Spectrophotometer | |
JPS6413171A (en) | Toner density detector | |
JPS5711361A (en) | Copying apparatus | |
JPS56107149A (en) | Densitometer |