JPS5792342A - Picture reproducing method - Google Patents

Picture reproducing method

Info

Publication number
JPS5792342A
JPS5792342A JP55167577A JP16757780A JPS5792342A JP S5792342 A JPS5792342 A JP S5792342A JP 55167577 A JP55167577 A JP 55167577A JP 16757780 A JP16757780 A JP 16757780A JP S5792342 A JPS5792342 A JP S5792342A
Authority
JP
Japan
Prior art keywords
accordance
magnification
picture
copy
curve
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
JP55167577A
Other languages
Japanese (ja)
Inventor
Kimio Nakahata
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP55167577A priority Critical patent/JPS5792342A/en
Publication of JPS5792342A publication Critical patent/JPS5792342A/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
    • G03G15/0415—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 and means for controlling illumination or exposure

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To always obtain a copy having a constant quality irrespective of varied magnification size, by varying the quantity of exposure of a picture and the quantity of light of a uniform light beam in accordance with the variation of copying magnification for cpying, and varying a gradient in case of forming a latent image in accordance with reduction or magnification size. CONSTITUTION:An electrostatic latent image forming characteristic (E-V curve) showing the relation between the secondary destaticizing simultaneous exposure quantity (E) and the surface potential (V) on the photosensitive drum is varied in accordance with size of the copying magnification. Therefore, a copy of a legible picture is obtained by correcting the E-V curve in accordance with the copying magnification. For instance, the total exposure quantity from an original at the time of secondary destaticization is decreased by reducing an iris diaphragm 7a of a lens 7 in accordance with the copying magnification 1.0, 0.7 and 0.5 (area ratio), also the quantity of light of a uniform light beam is varied to 30% from ''0'' by controlling a dimming circuit 13 of a light source 12, and the E-V curve is caried to C1, C2 and C3, by which a copy of a ligible picture is obtained.
JP55167577A 1980-11-28 1980-11-28 Picture reproducing method Pending JPS5792342A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55167577A JPS5792342A (en) 1980-11-28 1980-11-28 Picture reproducing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55167577A JPS5792342A (en) 1980-11-28 1980-11-28 Picture reproducing method

Publications (1)

Publication Number Publication Date
JPS5792342A true JPS5792342A (en) 1982-06-08

Family

ID=15852319

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55167577A Pending JPS5792342A (en) 1980-11-28 1980-11-28 Picture reproducing method

Country Status (1)

Country Link
JP (1) JPS5792342A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5309205A (en) * 1991-09-17 1994-05-03 Kabushiki Kaisha Toshiba Image forming apparatus having magnification error compensation
US5436702A (en) * 1992-09-21 1995-07-25 Kabushkiki Kaisha Toshiba Means for exposing original on image forming apparatus to provide uniform copies

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4918539B1 (en) * 1970-07-11 1974-05-10
JPS55142368A (en) * 1979-04-24 1980-11-06 Canon Inc Variable magnification copying machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4918539B1 (en) * 1970-07-11 1974-05-10
JPS55142368A (en) * 1979-04-24 1980-11-06 Canon Inc Variable magnification copying machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5309205A (en) * 1991-09-17 1994-05-03 Kabushiki Kaisha Toshiba Image forming apparatus having magnification error compensation
US5436702A (en) * 1992-09-21 1995-07-25 Kabushkiki Kaisha Toshiba Means for exposing original on image forming apparatus to provide uniform copies

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