JPS5677864A - Method and device for automatic exposure control for copying machine - Google Patents

Method and device for automatic exposure control for copying machine

Info

Publication number
JPS5677864A
JPS5677864A JP15302479A JP15302479A JPS5677864A JP S5677864 A JPS5677864 A JP S5677864A JP 15302479 A JP15302479 A JP 15302479A JP 15302479 A JP15302479 A JP 15302479A JP S5677864 A JPS5677864 A JP S5677864A
Authority
JP
Japan
Prior art keywords
image
aperture
original
exposure
forming lens
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
Application number
JP15302479A
Other languages
Japanese (ja)
Inventor
Hiromitsu Okada
Ikuo Mori
Takeshi Ishii
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.)
Tokyo Optical Co Ltd
Original Assignee
Tokyo Optical 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 Tokyo Optical Co Ltd filed Critical Tokyo Optical Co Ltd
Priority to JP15302479A priority Critical patent/JPS5677864A/en
Publication of JPS5677864A publication Critical patent/JPS5677864A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Of Exposure In Printing And Copying (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To obtain a clear copy by automatically regulating the aperture value of an optical image-formation system by setting an exposure reference value to the fog concentration part of the characteristic curve of a copying machine and then by determining proper exposure from the brightness of an original surface to be copied. CONSTITUTION:Original 1 has the original surface scanned by optical image-formation system L through slit 20 of certain width to the position of slit 21 shown by the broken lines. Information on original 1 is reflected by reflex mirror 2 after passing through image-forming lens system L and optical axis J and further reflected by reflex mirror 12 by way of image-forming lens 3, aperture 5 and image-forming lens 4 to form its image on image-formation surface 13. The photometry, in which the proper exposure is determined and the aperture is adjusted, is performed with luminous flux K. Luminous flux K from original 1 enters photoelectric element 7 via aperture opening 6 and converted into an electric signal and controller 11 performs control processing to output an aperture adjustment signal, with which aperture opening-closing member 8 is rotated to vary the opening area of aperture 5, so that the exposure will be varied.
JP15302479A 1979-11-28 1979-11-28 Method and device for automatic exposure control for copying machine Pending JPS5677864A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15302479A JPS5677864A (en) 1979-11-28 1979-11-28 Method and device for automatic exposure control for copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15302479A JPS5677864A (en) 1979-11-28 1979-11-28 Method and device for automatic exposure control for copying machine

Publications (1)

Publication Number Publication Date
JPS5677864A true JPS5677864A (en) 1981-06-26

Family

ID=15553286

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15302479A Pending JPS5677864A (en) 1979-11-28 1979-11-28 Method and device for automatic exposure control for copying machine

Country Status (1)

Country Link
JP (1) JPS5677864A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58172654A (en) * 1982-04-02 1983-10-11 Canon Inc Control device of image recording
JPS5913232A (en) * 1982-07-15 1984-01-24 Canon Inc Copying machine
JPS59159153A (en) * 1983-02-28 1984-09-08 Canon Inc Reproducing and outputting device of image
JPS6053965A (en) * 1983-09-05 1985-03-28 Canon Inc Device for controlling recording of image
JPS60117264A (en) * 1983-11-29 1985-06-24 Mita Ind Co Ltd Original density detector of electrostatic copying machine
JPS6120071A (en) * 1984-07-09 1986-01-28 Fuji Xerox Co Ltd Automatic image density controller of dry electrophotographic copying machine
JPS61184526A (en) * 1985-01-31 1986-08-18 Konishiroku Photo Ind Co Ltd Copying machine provided with optical system shielding member
JPS62289866A (en) * 1986-06-09 1987-12-16 Canon Inc Image density regulating device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58172654A (en) * 1982-04-02 1983-10-11 Canon Inc Control device of image recording
JPS5913232A (en) * 1982-07-15 1984-01-24 Canon Inc Copying machine
JPH0529907B2 (en) * 1982-07-15 1993-05-06 Canon Kk
JPS59159153A (en) * 1983-02-28 1984-09-08 Canon Inc Reproducing and outputting device of image
JPS6053965A (en) * 1983-09-05 1985-03-28 Canon Inc Device for controlling recording of image
JPS60117264A (en) * 1983-11-29 1985-06-24 Mita Ind Co Ltd Original density detector of electrostatic copying machine
JPS6120071A (en) * 1984-07-09 1986-01-28 Fuji Xerox Co Ltd Automatic image density controller of dry electrophotographic copying machine
JPS61184526A (en) * 1985-01-31 1986-08-18 Konishiroku Photo Ind Co Ltd Copying machine provided with optical system shielding member
JPH0453298B2 (en) * 1985-01-31 1992-08-26 Konishiroku Photo Ind
JPS62289866A (en) * 1986-06-09 1987-12-16 Canon Inc Image density regulating device

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