JPS55126263A - Variable magnification optical device - Google Patents
Variable magnification optical deviceInfo
- Publication number
- JPS55126263A JPS55126263A JP3395879A JP3395879A JPS55126263A JP S55126263 A JPS55126263 A JP S55126263A JP 3395879 A JP3395879 A JP 3395879A JP 3395879 A JP3395879 A JP 3395879A JP S55126263 A JPS55126263 A JP S55126263A
- Authority
- JP
- Japan
- Prior art keywords
- variable magnification
- original
- hence
- light source
- change
- 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
Abstract
PURPOSE: To obtain a fixed image plane illuminance irrespective of copying magnifications by changing original plane luminance distributions through the utilization of the deviation of the object point position relating to the main rays on the original surface at the time of variable magnification hence the change in the distance from a light source.
CONSTITUTION: The original surface is lighted by a light source 3 and reflecting mirrors 4, 5. The rays from the original 2 are reflected by a reflecting mirror 6 near the original surface side and a reflecting mirror 7 remote from the original surface and pass through a fixed focus lens 8, after which they are reflected by reflecting mirrors 9, 10, pass through a slit 11 and image on a drum surface 1. At the time of variable magnification, the respective reflecting mirrors and lens 8 are specifically displaced by utilizing the deflection of the object point relating to the main rays hence the change in the distance from the light source, whereby the scanning is done and the deviation of the object point is compensated. Hence, it is possible to change the luminance in the normal direction of the object surface at the time of variable magnification and make the image plane illuminance constant irrespective of copying magnifications.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3395879A JPS55126263A (en) | 1979-03-23 | 1979-03-23 | Variable magnification optical device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3395879A JPS55126263A (en) | 1979-03-23 | 1979-03-23 | Variable magnification optical device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55126263A true JPS55126263A (en) | 1980-09-29 |
Family
ID=12400990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3395879A Pending JPS55126263A (en) | 1979-03-23 | 1979-03-23 | Variable magnification optical device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55126263A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59128504A (en) * | 1983-01-13 | 1984-07-24 | Tokyo Optical Co Ltd | Variable power mechanism of optical device |
JPH06334501A (en) * | 1993-05-20 | 1994-12-02 | Nec Corp | Phase comparing circuit |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5392126A (en) * | 1977-01-25 | 1978-08-12 | Ricoh Co Ltd | Exposure regulator for variable magnification copying machine |
-
1979
- 1979-03-23 JP JP3395879A patent/JPS55126263A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5392126A (en) * | 1977-01-25 | 1978-08-12 | Ricoh Co Ltd | Exposure regulator for variable magnification copying machine |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59128504A (en) * | 1983-01-13 | 1984-07-24 | Tokyo Optical Co Ltd | Variable power mechanism of optical device |
JPH0454932B2 (en) * | 1983-01-13 | 1992-09-01 | Topcon Corp | |
JPH06334501A (en) * | 1993-05-20 | 1994-12-02 | Nec Corp | Phase comparing circuit |
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