Lithograph comprising a moving cylindrical lens system
The invention relates a lithograph for producing computer-generated holograms in a storage medium ( 13 ), provided with a source for generating a write beam ( 2 ), a moving lens ( 4 ) for focussing the write beam ( 2 ), means for displacing the moving lens ( 4 ) along a direction of movement ( 6 ),...
Saved in:
| Main Authors | , , , , |
|---|---|
| Format | Patent |
| Language | English |
| Published |
23.12.2004
|
| Online Access | Get full text |
Cover
Loading…
| Summary: | The invention relates a lithograph for producing computer-generated holograms in a storage medium (
13
), provided with a source for generating a write beam (
2
), a moving lens (
4
) for focussing the write beam (
2
), means for displacing the moving lens (
4
) along a direction of movement (
6
), and with a means for displacing the write beam (
2
) in relation to the storage medium (
13
) in a manner that is perpendicular to the direction of movement (
6
). The aim of the invention is to provide a lithograph in which disruptions in the movement of a lens perpendicular to the direction of movement thereof do not effect this end, the moving lens (
4
) has refractive power only essentially in a first direction that is parallel to the direction of movement (
6
). In addition, a stationary lens (
9
) is provided, and this stationary lens (
9
) has refractive power only essentially in a second direction (
5
), whereby the second direction (
5
) is perpendicular to the first direction and to the write beam (
2
). |
|---|