JPS5529854A - Light quantity control unit of copying machine - Google Patents

Light quantity control unit of copying machine

Info

Publication number
JPS5529854A
JPS5529854A JP10300478A JP10300478A JPS5529854A JP S5529854 A JPS5529854 A JP S5529854A JP 10300478 A JP10300478 A JP 10300478A JP 10300478 A JP10300478 A JP 10300478A JP S5529854 A JPS5529854 A JP S5529854A
Authority
JP
Japan
Prior art keywords
optical system
light
moving
light quantity
control unit
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
JP10300478A
Other languages
Japanese (ja)
Inventor
Takao Kikuchi
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 JP10300478A priority Critical patent/JPS5529854A/en
Publication of JPS5529854A publication Critical patent/JPS5529854A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Systems Of Projection Type Copiers (AREA)

Abstract

PURPOSE: To make possible the adjustment of the quantity of light passing through an optical system by moving a shutter film in the direction parallel to the imaginary plane orthogonal to the optical axis of the optical system.
CONSTITUTION: Quantity of light transmitting through an optical system 1 is detected by the light quantity detecting device 9 mounted in the optical system 1 and the information thereof is photoelectrically converted and transmitted to a comparateor 10. The information is compared with a reference voltage E in the circuit 10, by which the moving position of a shutter film 2 is calculated and the driving power P is given to a moving coil 8. The shutter film 2 is moved together with the moving coil 8 toward the specified place, whereby such aperture effect as to output correct quantity of light to the optical system is given.
COPYRIGHT: (C)1980,JPO&Japio
JP10300478A 1978-08-23 1978-08-23 Light quantity control unit of copying machine Pending JPS5529854A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10300478A JPS5529854A (en) 1978-08-23 1978-08-23 Light quantity control unit of copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10300478A JPS5529854A (en) 1978-08-23 1978-08-23 Light quantity control unit of copying machine

Publications (1)

Publication Number Publication Date
JPS5529854A true JPS5529854A (en) 1980-03-03

Family

ID=14342510

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10300478A Pending JPS5529854A (en) 1978-08-23 1978-08-23 Light quantity control unit of copying machine

Country Status (1)

Country Link
JP (1) JPS5529854A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58192029A (en) * 1982-04-30 1983-11-09 ゼロツクス・コ−ポレ−シヨン Image formation apparatus for projection
JPS63157138A (en) * 1986-12-22 1988-06-30 Tokyo Optical Co Ltd Variable power optical device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58192029A (en) * 1982-04-30 1983-11-09 ゼロツクス・コ−ポレ−シヨン Image formation apparatus for projection
JPH041897B2 (en) * 1982-04-30 1992-01-14 Xerox Corp
JPS63157138A (en) * 1986-12-22 1988-06-30 Tokyo Optical Co Ltd Variable power optical device

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