JPS5579472A - Aperture device of optical system in copying machine - Google Patents

Aperture device of optical system in copying machine

Info

Publication number
JPS5579472A
JPS5579472A JP15433378A JP15433378A JPS5579472A JP S5579472 A JPS5579472 A JP S5579472A JP 15433378 A JP15433378 A JP 15433378A JP 15433378 A JP15433378 A JP 15433378A JP S5579472 A JPS5579472 A JP S5579472A
Authority
JP
Japan
Prior art keywords
exposure
cam
optical system
aperture plate
aperture
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
JP15433378A
Other languages
Japanese (ja)
Inventor
Masaki Nakaoka
Muneharu Sugiura
Shinji Murata
Teruo Morikawa
Yoshiaki Sone
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 JP15433378A priority Critical patent/JPS5579472A/en
Publication of JPS5579472A publication Critical patent/JPS5579472A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Systems Of Projection Type Copiers (AREA)

Abstract

PURPOSE: To achieve the improvement in service characteristic by so adjusting the opening area of the aperture part of the optical system as to change always by a fixed rate through the use of cam mechanisms.
CONSTITUTION: An aperture plate 10 is supported in the suitable position on optical path, rotatably to the side plate, etc. by a shaft 12. When the aperture plate 10 is rotated by the revolution of the shaft 12, the area of the orthogonal projection to the plane perpendicular to the luminous flux of its opening 11 changes and therefore the exposure to the photoreceptor also changes. If the cam 15 surface is so set by utilizing cam mechanisms 14, 15 that the angle ψ that it assumes to the aperture plate 10 satisfies formula 3, the exposure may be so controlled that the ratio of the maximum value and minimum value of the exposure is always constant M with respect to a fixed rotating angle θ0. θ is the rotating angle of the cam. a, b are constants.
COPYRIGHT: (C)1980,JPO&Japio
JP15433378A 1978-12-12 1978-12-12 Aperture device of optical system in copying machine Pending JPS5579472A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15433378A JPS5579472A (en) 1978-12-12 1978-12-12 Aperture device of optical system in copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15433378A JPS5579472A (en) 1978-12-12 1978-12-12 Aperture device of optical system in copying machine

Publications (1)

Publication Number Publication Date
JPS5579472A true JPS5579472A (en) 1980-06-14

Family

ID=15581848

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15433378A Pending JPS5579472A (en) 1978-12-12 1978-12-12 Aperture device of optical system in copying machine

Country Status (1)

Country Link
JP (1) JPS5579472A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0185748U (en) * 1987-11-26 1989-06-07

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0185748U (en) * 1987-11-26 1989-06-07

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