JPS56138756A - Copying machine for variable magnification - Google Patents

Copying machine for variable magnification

Info

Publication number
JPS56138756A
JPS56138756A JP4136980A JP4136980A JPS56138756A JP S56138756 A JPS56138756 A JP S56138756A JP 4136980 A JP4136980 A JP 4136980A JP 4136980 A JP4136980 A JP 4136980A JP S56138756 A JPS56138756 A JP S56138756A
Authority
JP
Japan
Prior art keywords
variable magnification
variable
rom
read
constitution
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
JP4136980A
Other languages
Japanese (ja)
Inventor
Tsutomu Shoji
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 JP4136980A priority Critical patent/JPS56138756A/en
Publication of JPS56138756A publication Critical patent/JPS56138756A/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
    • G03G15/041—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 variable magnification

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Variable Magnification In Projection-Type Copying Machines (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

PURPOSE:To make constitution simple and perform sure variable magnification copying by changing the read-out speed of the subsequent positions of a moving mirror from an ROM via a counter by generating the pulse trains of different periods according to variable magnifications. CONSTITUTION:Slit rows of the number corresponding to variable magnifications are provided to a disc of a pulse generator turning synchronously with a photosensitive drum, and the pulses F of different periods according to variable magnifications are generated therefrom. These pulses F are counted with an address counter CO2. An ROM in which the information corresponding to the nonlinear variable magnification positions corresponding to unmagnification is read out, and a coil bobbin 30 is controlled via a D/A converter DA2 etc., whereby the mirror moving speed of an exposure optical system is controlled. Desired variable magnification copying is surely accomplished by the controlling according to these read-out speeds with the simple constitution of just one set of ROM.
JP4136980A 1980-03-31 1980-03-31 Copying machine for variable magnification Pending JPS56138756A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4136980A JPS56138756A (en) 1980-03-31 1980-03-31 Copying machine for variable magnification

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4136980A JPS56138756A (en) 1980-03-31 1980-03-31 Copying machine for variable magnification

Publications (1)

Publication Number Publication Date
JPS56138756A true JPS56138756A (en) 1981-10-29

Family

ID=12606520

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4136980A Pending JPS56138756A (en) 1980-03-31 1980-03-31 Copying machine for variable magnification

Country Status (1)

Country Link
JP (1) JPS56138756A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59220724A (en) * 1983-05-30 1984-12-12 Sharp Corp Controller for original scanning of variable power copying machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54133143A (en) * 1978-04-05 1979-10-16 Minolta Camera Co Ltd Scanning system control device in electrophotographic copier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54133143A (en) * 1978-04-05 1979-10-16 Minolta Camera Co Ltd Scanning system control device in electrophotographic copier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59220724A (en) * 1983-05-30 1984-12-12 Sharp Corp Controller for original scanning of variable power copying machine

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