JPS5466155A - Correction metod of lens illuminance unevenness - Google Patents
Correction metod of lens illuminance unevennessInfo
- Publication number
- JPS5466155A JPS5466155A JP13321477A JP13321477A JPS5466155A JP S5466155 A JPS5466155 A JP S5466155A JP 13321477 A JP13321477 A JP 13321477A JP 13321477 A JP13321477 A JP 13321477A JP S5466155 A JPS5466155 A JP S5466155A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- absorbing film
- film
- coated
- peripheral part
- 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 correct illuminance unevenness by minimizing loss of quantity of light, by providing an absorbing film and a transmission increasing film on the surface of a lens so as to reduce the quantity of transmitted light in the central part of the lens and increase the quantity of transmitted light in the peripheral part thereof.
CONSTITUTION: The surface 7 of a lens 6 is coated with an absorbing film 9 of which thickness is the largest at its central part ϕ and decreases gradually towards the peripheral part 8 thereof. Close to this absorbing film 9 is provided a transmission increasing film 10 of which thickness increases towards the peripheral part 8. In this setting, when an original plane 5 is illuminated flatly, the relation between incident angle θ and illuminance will be as shown by dotted line (b). If the lens 6 is coated only with the absorbing film 9, the relation will be as shown by by solid line (a). Therefore, when the lens 6 is coated with absorbing film 9 and transmission increasing film 10, the illuminance is even, and the loss of quantity of light is small.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13321477A JPS5466155A (en) | 1977-11-07 | 1977-11-07 | Correction metod of lens illuminance unevenness |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13321477A JPS5466155A (en) | 1977-11-07 | 1977-11-07 | Correction metod of lens illuminance unevenness |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5466155A true JPS5466155A (en) | 1979-05-28 |
Family
ID=15099385
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13321477A Pending JPS5466155A (en) | 1977-11-07 | 1977-11-07 | Correction metod of lens illuminance unevenness |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5466155A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56106209A (en) * | 1980-01-28 | 1981-08-24 | Furukawa Electric Co Ltd:The | Correcting method for light quantity distribution of rod lens |
JPS6161101A (en) * | 1984-08-31 | 1986-03-28 | Takashi Mori | Condenser lens |
-
1977
- 1977-11-07 JP JP13321477A patent/JPS5466155A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56106209A (en) * | 1980-01-28 | 1981-08-24 | Furukawa Electric Co Ltd:The | Correcting method for light quantity distribution of rod lens |
JPS6161101A (en) * | 1984-08-31 | 1986-03-28 | Takashi Mori | Condenser lens |
JPH0449681B2 (en) * | 1984-08-31 | 1992-08-12 | Takashi Mori |
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