JPS57114162A - Exposure controller of copying machine - Google Patents

Exposure controller of copying machine

Info

Publication number
JPS57114162A
JPS57114162A JP40481A JP40481A JPS57114162A JP S57114162 A JPS57114162 A JP S57114162A JP 40481 A JP40481 A JP 40481A JP 40481 A JP40481 A JP 40481A JP S57114162 A JPS57114162 A JP S57114162A
Authority
JP
Japan
Prior art keywords
voltage
exposure
optical system
power supply
motor
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
JP40481A
Other languages
Japanese (ja)
Inventor
Kenji Hashimoto
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 JP40481A priority Critical patent/JPS57114162A/en
Publication of JPS57114162A publication Critical patent/JPS57114162A/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 always assure the optimum exposure state, by varying the shifting speed of an optical system in accordance with the variation of the quantity of light of an exposure lamp if caused by the voltage fluctuation of an AC power supply. CONSTITUTION:In case the voltage of an AC power supply 1 is normal, the AC voltage is supplied to a DC motor 6 which gives the full wave rectification to the AC voltage with a full wave rectifier 5 and moves an optical system. Thus an exposure is carried out. When the voltage of the power supply 1 increases during an exposure to increase the quantity of light of a lamp 2, a Cds18 varies its resistance value R18 according to the change of the quantity of light. As a result the threshold voltage V1 is reduced. With a reduction of the voltage V1, the angle of phase with which a thyristor 17 has ignition varies to apply the voltage to the DC motor 6. Accordingly the number of rotations of the motor 6 increases to accelerate the shifting speed of the optical system. In such constitution, the optimum exposure state is always assured.
JP40481A 1981-01-07 1981-01-07 Exposure controller of copying machine Pending JPS57114162A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP40481A JPS57114162A (en) 1981-01-07 1981-01-07 Exposure controller of copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP40481A JPS57114162A (en) 1981-01-07 1981-01-07 Exposure controller of copying machine

Publications (1)

Publication Number Publication Date
JPS57114162A true JPS57114162A (en) 1982-07-15

Family

ID=11472856

Family Applications (1)

Application Number Title Priority Date Filing Date
JP40481A Pending JPS57114162A (en) 1981-01-07 1981-01-07 Exposure controller of copying machine

Country Status (1)

Country Link
JP (1) JPS57114162A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01306831A (en) * 1988-06-03 1989-12-11 Sharp Corp Copying machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01306831A (en) * 1988-06-03 1989-12-11 Sharp Corp Copying machine

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