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JPS5719768A - Exposure control device for copying machine - Google Patents

Exposure control device for copying machine

Info

Publication number
JPS5719768A
JPS5719768A JP9425080A JP9425080A JPS5719768A JP S5719768 A JPS5719768 A JP S5719768A JP 9425080 A JP9425080 A JP 9425080A JP 9425080 A JP9425080 A JP 9425080A JP S5719768 A JPS5719768 A JP S5719768A
Authority
JP
Japan
Prior art keywords
movement
lens
change
light sources
moves
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
JP9425080A
Other languages
Japanese (ja)
Inventor
Satoshi Hisabayashi
Masahiro Ogiso
Yosuke Igarashi
Yoshio Horiguchi
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.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu 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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP9425080A priority Critical patent/JPS5719768A/en
Priority to US06/281,540 priority patent/US4367038A/en
Priority to GB8121304A priority patent/GB2079963B/en
Priority to DE19813127404 priority patent/DE3127404C2/en
Publication of JPS5719768A publication Critical patent/JPS5719768A/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)
  • Control Of Exposure In Printing And Copying (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

PURPOSE:To automatically correct the nonuniformity of the quantity of incident light for the change in copying magnification by providing control parts which correspond to light sources in the period when the pulse signals generated according to the change in the resistance value responding to the movement of a lens and the fluctuation in source voltage are counted according to exposure indices. CONSTITUTION:According to the movement of a cam 17 accompanied with the movement of a projecting lens 11, a slider 20 moves vertically, and a wire 25 moves back and forth so that a reflecting mirror 10 moves as well. The duplex variable resistors 29a, 29b coupled to the shaft 28 of a pulley 26 are driven by the revolution of a pulley 14, and according to the movement of the lens 11, the resistance values of the variable resistors change. Light sources 9a, 9b are divided in wirings to two groups of lens 11 side and opposite side with a reflecting mirror 10 as a center. The lighting of the group A light sources 9a and the group B light source 9b is controlled by respectively discrete control parts.
JP9425080A 1980-07-10 1980-07-10 Exposure control device for copying machine Pending JPS5719768A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP9425080A JPS5719768A (en) 1980-07-10 1980-07-10 Exposure control device for copying machine
US06/281,540 US4367038A (en) 1980-07-10 1981-07-08 Exposure control systems for use in copying machine
GB8121304A GB2079963B (en) 1980-07-10 1981-07-10 Exposure control systems for use in copying machine
DE19813127404 DE3127404C2 (en) 1980-07-10 1981-07-10 Device for controlling the switch-on time of a light source in a copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9425080A JPS5719768A (en) 1980-07-10 1980-07-10 Exposure control device for copying machine

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP16960886A Division JPS6211844A (en) 1986-07-18 1986-07-18 Copy machine exposure control device

Publications (1)

Publication Number Publication Date
JPS5719768A true JPS5719768A (en) 1982-02-02

Family

ID=14105047

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9425080A Pending JPS5719768A (en) 1980-07-10 1980-07-10 Exposure control device for copying machine

Country Status (2)

Country Link
JP (1) JPS5719768A (en)
DE (1) DE3127404C2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60134226A (en) * 1983-12-23 1985-07-17 Asahi Optical Co Ltd Control device for exposure of slit exposing type variable power copying machine
JPS61113055A (en) * 1984-11-08 1986-05-30 Fuji Xerox Co Ltd Flash exposing device of copying machine
JPS6440941A (en) * 1987-07-21 1989-02-13 Minnesota Mining & Mfg Uv photosensitive directly positive silver halide photographic element

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5223572A (en) * 1975-08-15 1977-02-22 Sumitomo Chem Co Ltd Folded screen type reactor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884576A (en) * 1972-02-05 1975-05-20 Ricoh Kk Exposure unit for a copying machine having a variable magnification
JPS5182630A (en) * 1975-01-16 1976-07-20 Minolta Camera Kk
US4113378A (en) * 1977-03-02 1978-09-12 Itek Corporation Linear exposure control system
JPS54161983A (en) * 1978-06-12 1979-12-22 Canon Inc Temperature compensating circuit of photometric circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5223572A (en) * 1975-08-15 1977-02-22 Sumitomo Chem Co Ltd Folded screen type reactor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60134226A (en) * 1983-12-23 1985-07-17 Asahi Optical Co Ltd Control device for exposure of slit exposing type variable power copying machine
JPS61113055A (en) * 1984-11-08 1986-05-30 Fuji Xerox Co Ltd Flash exposing device of copying machine
JPS6440941A (en) * 1987-07-21 1989-02-13 Minnesota Mining & Mfg Uv photosensitive directly positive silver halide photographic element

Also Published As

Publication number Publication date
DE3127404C2 (en) 1987-01-29
DE3127404A1 (en) 1982-03-11

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