Illumination and light gate utilization methods and apparatus
US4505551A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 29, 1979 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Nov 29, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/055
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of selectively illuminating a surface, such as a light-sensitive recording medium or an information record, provides a slit traveling transversely to a longitudinal dimension thereof and images light from a source of spatially concentrated light through the slit onto the above mentioned surface anamorphically only as to a dimension of the spatially concentrated light corresponding to the longitudinal dimension of the slit. Light is further spread from the source in a plane parallel to the transverse travel of the slit and is collimated, to be projected through the slit onto the above mentioned surface and for the extent of at least a portion of the transverse travel of the slit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.