JPS566272A - Illuminance distribution adjusting device - Google Patents
Illuminance distribution adjusting deviceInfo
- Publication number
- JPS566272A JPS566272A JP8143179A JP8143179A JPS566272A JP S566272 A JPS566272 A JP S566272A JP 8143179 A JP8143179 A JP 8143179A JP 8143179 A JP8143179 A JP 8143179A JP S566272 A JPS566272 A JP S566272A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- shield member
- central axis
- original platen
- case
- 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 correct the uneven illuminance on photosensitive drum surface in the lens scanning direction and at the variable power by moving or rotating a shield member. CONSTITUTION:A shield member 5 is provided between a lens 2 and a slit 3 and this shield member 5 is supported to a metal-wire-form support 6. In the case of correcting the uneven illuminance in the lens scanning direction and when the lens 2 is on the central axis P of an original platen, the central part of the lens 2 is shielded by the shield member 5 placed on the central axis P of the original platen and when the lens 2 goes away from the central axis P of the original platen, the peripheral part of the lens 2 is shielded to increase the quantity of shielding the luminous flux of the case when the lens 2 is on the central axis P of the original platen, whereby the quantity of light on a photosensitive drum 4 is made constant. In the case of correcting the uneven illuminance at the variable power, the shield member 5 is moved along with the movement of the lens 2 and the support 6 is rotated to turn said shield member 5 and oppose the same to the lens 2, whereby the shield area on the side where the quantity of light is larger is increased and the correction is thus done.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8143179A JPS566272A (en) | 1979-06-29 | 1979-06-29 | Illuminance distribution adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8143179A JPS566272A (en) | 1979-06-29 | 1979-06-29 | Illuminance distribution adjusting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS566272A true JPS566272A (en) | 1981-01-22 |
Family
ID=13746184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8143179A Pending JPS566272A (en) | 1979-06-29 | 1979-06-29 | Illuminance distribution adjusting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS566272A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57104953A (en) * | 1980-12-22 | 1982-06-30 | Ricoh Co Ltd | Exposure method of variable power copying machine |
| JPS5891475A (en) * | 1981-11-27 | 1983-05-31 | Canon Inc | Picture forming device |
| JPS61201230A (en) * | 1985-03-05 | 1986-09-05 | Konishiroku Photo Ind Co Ltd | Variable magnification copying machine |
-
1979
- 1979-06-29 JP JP8143179A patent/JPS566272A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57104953A (en) * | 1980-12-22 | 1982-06-30 | Ricoh Co Ltd | Exposure method of variable power copying machine |
| JPS5891475A (en) * | 1981-11-27 | 1983-05-31 | Canon Inc | Picture forming device |
| JPS6248818B2 (en) * | 1981-11-27 | 1987-10-15 | Canon Kk | |
| JPS61201230A (en) * | 1985-03-05 | 1986-09-05 | Konishiroku Photo Ind Co Ltd | Variable magnification copying machine |
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