JPS5639554A - Original density measuring method - Google Patents

Original density measuring method

Info

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
Application number
JP11496479A
Other languages
Japanese (ja)
Other versions
JPS643246B2 (en
Inventor
Mitsuaki Kamiyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP11496479A priority Critical patent/JPS5639554A/en
Priority to US06/183,408 priority patent/US4341460A/en
Priority to DE3033524A priority patent/DE3033524C2/en
Publication of JPS5639554A publication Critical patent/JPS5639554A/en
Publication of JPS643246B2 publication Critical patent/JPS643246B2/ja
Granted legal-status Critical Current

Links

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.
JP11496479A 1979-09-07 1979-09-07 Original density measuring method Granted JPS5639554A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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