JPS5773767A - Method of exposure for variable magnification copier - Google Patents

Method of exposure for variable magnification copier

Info

Publication number
JPS5773767A
JPS5773767A JP14901180A JP14901180A JPS5773767A JP S5773767 A JPS5773767 A JP S5773767A JP 14901180 A JP14901180 A JP 14901180A JP 14901180 A JP14901180 A JP 14901180A JP S5773767 A JPS5773767 A JP S5773767A
Authority
JP
Japan
Prior art keywords
exposure
shading
plates
lens
amount
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
JP14901180A
Other languages
Japanese (ja)
Inventor
Masami Emoto
Junichi Kitabayashi
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 JP14901180A priority Critical patent/JPS5773767A/en
Publication of JPS5773767A publication Critical patent/JPS5773767A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/54—Lamp housings; Illuminating means
    • G03B27/542—Lamp housings; Illuminating means for copying cameras, reflex exposure lighting

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Variable Magnification In Projection-Type Copying Machines (AREA)
  • Optical Systems Of Projection Type Copiers (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

PURPOSE:To enable slit exposure always at proper exposure distribution by moving a shading plates perpendicularly to the optic axis of the lens and thereby changing the amount of interception of exposure pensil of light rays and making distribution of exposure in longitudinal direction of exposed part uniform. CONSTITUTION:Two shading plates 10, 11 are placed at positions 3A, 3B of the end face of a lens, or, the shading plate 10 is placed at the position 3A and shading plate 11 at the position 3D. In the former method, shading plates 10, 11 are symmetrical to the optical axis L, and the plates are made so that they are movable symmetrically to the optic axis L in the direction corresponding to longitudinal, or left and right, direction of the exposed part. In the latter method, shading plates 10, 11 are placed in the same side in relation to the optic axis L of the lens, and they moves in left and right direction in a pair and intercept exposing pencil of light symmectrically. By this way, the amount of interception of exposing pencil of light is changed and distribution of amount of exposure is made uniform.
JP14901180A 1980-10-24 1980-10-24 Method of exposure for variable magnification copier Pending JPS5773767A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14901180A JPS5773767A (en) 1980-10-24 1980-10-24 Method of exposure for variable magnification copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14901180A JPS5773767A (en) 1980-10-24 1980-10-24 Method of exposure for variable magnification copier

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP7347289A Division JPH01280746A (en) 1989-03-24 1989-03-24 Exposure method in variable magnification copying machine

Publications (1)

Publication Number Publication Date
JPS5773767A true JPS5773767A (en) 1982-05-08

Family

ID=15465716

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14901180A Pending JPS5773767A (en) 1980-10-24 1980-10-24 Method of exposure for variable magnification copier

Country Status (1)

Country Link
JP (1) JPS5773767A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5891475A (en) * 1981-11-27 1983-05-31 Canon Inc Picture forming device
JPS6055325A (en) * 1983-09-06 1985-03-30 Ricoh Co Ltd Correcting device of uneven illuminance in variable magnification copying machine
US4806989A (en) * 1986-05-14 1989-02-21 Konishiroku Photo Industry Co., Ltd. Optical correction device
EP0902335A3 (en) * 1997-09-11 2000-04-12 Canon Kabushiki Kaisha Image reading apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4918539B1 (en) * 1970-07-11 1974-05-10
JPS5391728A (en) * 1977-01-24 1978-08-11 Ricoh Co Ltd Correction device for uneven intensity of illumination for variable multiplication copier
JPS5428632A (en) * 1977-08-05 1979-03-03 Konishiroku Photo Ind Co Ltd Method and apparatus of exposure correction in copying magnification varaible copying apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4918539B1 (en) * 1970-07-11 1974-05-10
JPS5391728A (en) * 1977-01-24 1978-08-11 Ricoh Co Ltd Correction device for uneven intensity of illumination for variable multiplication copier
JPS5428632A (en) * 1977-08-05 1979-03-03 Konishiroku Photo Ind Co Ltd Method and apparatus of exposure correction in copying magnification varaible copying apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5891475A (en) * 1981-11-27 1983-05-31 Canon Inc Picture forming device
JPS6055325A (en) * 1983-09-06 1985-03-30 Ricoh Co Ltd Correcting device of uneven illuminance in variable magnification copying machine
US4806989A (en) * 1986-05-14 1989-02-21 Konishiroku Photo Industry Co., Ltd. Optical correction device
EP0902335A3 (en) * 1997-09-11 2000-04-12 Canon Kabushiki Kaisha Image reading apparatus

Similar Documents

Publication Publication Date Title
AU4586479A (en) Interchangeable adjustable focus lenses
JPS5363028A (en) Apparatus for focusing by continuously changing magnification for electrostatic copier
GB2033607B (en) Zoom lenses having three or four lens groups
JPS52154641A (en) Copier
GB1505005A (en) Shift mechanism for objective lens systems with variable focal length
JPS5773767A (en) Method of exposure for variable magnification copier
JPS5391728A (en) Correction device for uneven intensity of illumination for variable multiplication copier
JPS5768873A (en) Variable scale factor copying optical device which is capable of magnification and reduction
GB2076990B (en) Variable magnification copying lens system having three groups
JPS54622A (en) Copying lens
ES441794A1 (en) Compact camera and viewer apparatus
JPS56162727A (en) Focusing device of zoom lens
GB2160668B (en) Focal position adjusting device for small variable magnification type copying machine with zoom lens
JPS57169773A (en) Light shielding device for variable magnification copying machine
JPS5724922A (en) Zoomlens barrel
JPS5387727A (en) Reflector type telephoto lens with flexible mirror
JPS5428632A (en) Method and apparatus of exposure correction in copying magnification varaible copying apparatus
JPS533256A (en) Instrument for measuring focal length by measuring lens magnification
JPS5421747A (en) Optical distributor
JPS56132305A (en) Interchangeable type variable magnification lens system
JPS5646267A (en) Unidirectional variable magnification duplicating method
JPS57111559A (en) Exposing method of variable magnification type copier
JPS57133414A (en) Correcting device for focus detecting device
JPS5737342A (en) Variable magnification copying machine
JPS572062A (en) Exposure device of copying machine