JPS56161530A - Automatic exposure controller of copying machine - Google Patents

Automatic exposure controller of copying machine

Info

Publication number
JPS56161530A
JPS56161530A JP6459980A JP6459980A JPS56161530A JP S56161530 A JPS56161530 A JP S56161530A JP 6459980 A JP6459980 A JP 6459980A JP 6459980 A JP6459980 A JP 6459980A JP S56161530 A JPS56161530 A JP S56161530A
Authority
JP
Japan
Prior art keywords
original
transmittance
microcomputer
light source
exposure
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
JP6459980A
Other languages
Japanese (ja)
Inventor
Arata Umeda
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP6459980A priority Critical patent/JPS56161530A/en
Publication of JPS56161530A publication Critical patent/JPS56161530A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus

Abstract

PURPOSE:To measure the transmittance of an original always accurately by reading the transmittance of the original in correspondence to the conveyance speed of the original in an average manner. CONSTITUTION:An original O is read of its transmittance by an original transmittance detector consisting of a light source 1 and a photodetector 2, and the data thereof are A/D-converted and are introduced into a microcomputer. At the same time, a photointerruptor 5 consisting of a disc provided with multiple holes is provided on a driving roll which drives a conveyance belt 3, and the pulses generated by this are put into the interruption terminal of the microcomputer, by which interruption is generated at every pulse. The output processed by the microcomputer are D/A-converted and control a motor for conveyance or a light source for exposure by way of a control circuit. In this way, the transmittance of the original is read in an average manner with respect to the conveyance speed of the original, and based on these data, the motor or the light source for exposure is controlled and therefore correct exposure is obtained.
JP6459980A 1980-05-15 1980-05-15 Automatic exposure controller of copying machine Pending JPS56161530A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6459980A JPS56161530A (en) 1980-05-15 1980-05-15 Automatic exposure controller of copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6459980A JPS56161530A (en) 1980-05-15 1980-05-15 Automatic exposure controller of copying machine

Publications (1)

Publication Number Publication Date
JPS56161530A true JPS56161530A (en) 1981-12-11

Family

ID=13262872

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6459980A Pending JPS56161530A (en) 1980-05-15 1980-05-15 Automatic exposure controller of copying machine

Country Status (1)

Country Link
JP (1) JPS56161530A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5857116A (en) * 1981-09-30 1983-04-05 Konishiroku Photo Ind Co Ltd Camera installed with microprocessor
JPS58172628A (en) * 1982-04-03 1983-10-11 Nippon Kogaku Kk <Nikon> Control system of camera
JPS59136728A (en) * 1983-01-26 1984-08-06 Canon Inc Image forming device
JPS59159153A (en) * 1983-02-28 1984-09-08 Canon Inc Reproducing and outputting device of image
JPS62170949A (en) * 1986-01-24 1987-07-28 Copyer Co Ltd Method for measuring quantity of light transmitted through original in diazo-copying machine
JP2008139198A (en) * 2006-12-04 2008-06-19 Nikko Co Ltd Conveyor scale of belt conveyor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5857116A (en) * 1981-09-30 1983-04-05 Konishiroku Photo Ind Co Ltd Camera installed with microprocessor
JPS58172628A (en) * 1982-04-03 1983-10-11 Nippon Kogaku Kk <Nikon> Control system of camera
JPH065351B2 (en) * 1982-04-03 1994-01-19 株式会社ニコン Camera controller
JPS59136728A (en) * 1983-01-26 1984-08-06 Canon Inc Image forming device
JPH0541993B2 (en) * 1983-01-26 1993-06-25 Canon Kk
JPS59159153A (en) * 1983-02-28 1984-09-08 Canon Inc Reproducing and outputting device of image
JPS62170949A (en) * 1986-01-24 1987-07-28 Copyer Co Ltd Method for measuring quantity of light transmitted through original in diazo-copying machine
JP2008139198A (en) * 2006-12-04 2008-06-19 Nikko Co Ltd Conveyor scale of belt conveyor

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