JPS5529854A - Light quantity control unit of copying machine - Google Patents
Light quantity control unit of copying machineInfo
- 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
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
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)
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 |
-
1978
- 1978-08-23 JP JP10300478A patent/JPS5529854A/en active Pending
Cited By (3)
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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