JPS5681864A - Compensating device for uneven illuminance - Google Patents
Compensating device for uneven illuminanceInfo
- Publication number
- JPS5681864A JPS5681864A JP15899179A JP15899179A JPS5681864A JP S5681864 A JPS5681864 A JP S5681864A JP 15899179 A JP15899179 A JP 15899179A JP 15899179 A JP15899179 A JP 15899179A JP S5681864 A JPS5681864 A JP S5681864A
- Authority
- JP
- Japan
- Prior art keywords
- distribution
- time
- luminous flux
- unmagnification
- cos
- 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)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Variable Magnification In Projection-Type Copying Machines (AREA)
Abstract
PURPOSE:To obtain a compact compensating device for uneven illuminance with a simple constitution, by providing the luminous flux control component which gives a luminous control only to the effective luminous flux when the magnification ratio is varied over its entire region and in the longer direction of the slit at the image filed side, i.e. between the lens in the optical path and the photoreceptor. CONSTITUTION:The luminous flux control component 7 is provided to give a luminous flux control only to the effective luminous flux at the time of various magnification ratios over the entire region and in the longer direction of the slit and not to give any effect to the effective luminous flux at the time of unmagnification ratio. At the time of unmagnification ratio, the distribution 9 shows the luminance distribution of the light source and the distribution 10 shows the light transmission distribution due to the cos 4 multiplication law of the lens 8, respectively. As a result, the cos 4 multiplication law is compensated at the time of unmagnification to give a uniform distribution 11 on the photoreceptor. Then the light source luminance distribution corresponding to the variable magnification image turns to 9' at the time of various magnifications. The distributions 10' and 10'' show the light transmission distribution due to the cos 4 multiplication law due to the lens 8'' at the time of various magnifications and the air ventilation distribution obtained by inverting the light transmission distribution 10' centering on l1, respectively. The light source luminance distribution 9'' is piled onto the conversion distribution 10'', and thus the illuminance distribution on the photoreceptor turns to 11'' at the time of various magnifications.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15899179A JPS5681864A (en) | 1979-12-06 | 1979-12-06 | Compensating device for uneven illuminance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15899179A JPS5681864A (en) | 1979-12-06 | 1979-12-06 | Compensating device for uneven illuminance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5681864A true JPS5681864A (en) | 1981-07-04 |
Family
ID=15683824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15899179A Pending JPS5681864A (en) | 1979-12-06 | 1979-12-06 | Compensating device for uneven illuminance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5681864A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58144853A (en) * | 1982-02-23 | 1983-08-29 | Fuji Xerox Co Ltd | Corrector for uneven illuminance of variable power copying machine |
| JPS59107339A (en) * | 1982-12-13 | 1984-06-21 | Toshiba Corp | Image forming device |
-
1979
- 1979-12-06 JP JP15899179A patent/JPS5681864A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58144853A (en) * | 1982-02-23 | 1983-08-29 | Fuji Xerox Co Ltd | Corrector for uneven illuminance of variable power copying machine |
| JPS59107339A (en) * | 1982-12-13 | 1984-06-21 | Toshiba Corp | Image forming device |
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