JPS57124373A - Exposure controller for copying machine - Google Patents

Exposure controller for copying machine

Info

Publication number
JPS57124373A
JPS57124373A JP56010054A JP1005481A JPS57124373A JP S57124373 A JPS57124373 A JP S57124373A JP 56010054 A JP56010054 A JP 56010054A JP 1005481 A JP1005481 A JP 1005481A JP S57124373 A JPS57124373 A JP S57124373A
Authority
JP
Japan
Prior art keywords
value
voltage
power supply
generating circuit
difference
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
JP56010054A
Other languages
Japanese (ja)
Inventor
Akiro Iimori
Hiroshi Matsumoto
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 JP56010054A priority Critical patent/JPS57124373A/en
Publication of JPS57124373A publication Critical patent/JPS57124373A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/043—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for controlling illumination or exposure

Abstract

PURPOSE:To compensate fluctuation in power supply and difference in density of background of originals, by controlling a power supplied to a lamp through the detection of the power supply voltage and exposure intensity output. CONSTITUTION:An effective value of a voltage applied from an AC power supply 31 is obtained at a voltage generating circuit 35 to an exposure lamp 2. On the other hand, the light of an exposure lamp 2 reflected on an original is received on a photo detector 22, and the difference between the value and the standard value is calculated at an automatic reference voltage generating circuit 37. Either one of the value or an output value of a manual reference generating circuit to set the density manually is selected at a switch 38, it is amplified according to magnification at a voltage adjusting circuit 39, the upper limit is cut at a limit circuit 40 and inputted to an error amplifier 41. The error amplifier 41 obtains the difference with the effective voltage value of the power supply, and a trigger pulse generating circuit 42 controls the conduction angle of a thyristor 32 based on it.
JP56010054A 1981-01-26 1981-01-26 Exposure controller for copying machine Pending JPS57124373A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56010054A JPS57124373A (en) 1981-01-26 1981-01-26 Exposure controller for copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56010054A JPS57124373A (en) 1981-01-26 1981-01-26 Exposure controller for copying machine

Publications (1)

Publication Number Publication Date
JPS57124373A true JPS57124373A (en) 1982-08-03

Family

ID=11739671

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56010054A Pending JPS57124373A (en) 1981-01-26 1981-01-26 Exposure controller for copying machine

Country Status (1)

Country Link
JP (1) JPS57124373A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6080834A (en) * 1983-10-07 1985-05-08 Sharp Corp Automatic control device for exposing for copying machine
US4673282A (en) * 1984-08-29 1987-06-16 Minolta Camera Kabushiki Kaisha Electrophotographic copying apparatus
JPS6321939U (en) * 1986-07-29 1988-02-13

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6080834A (en) * 1983-10-07 1985-05-08 Sharp Corp Automatic control device for exposing for copying machine
US4673282A (en) * 1984-08-29 1987-06-16 Minolta Camera Kabushiki Kaisha Electrophotographic copying apparatus
JPS6321939U (en) * 1986-07-29 1988-02-13

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