Fresnel lens in an improved infinity image display system
USH423H · kind H · statutory invention registration
6Cited by
0References
4Claims
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Key dates
| Filing date | — |
| Grant date | Feb 2, 1988 |
| Priority date | — |
| Expiry date | — |
Classification
- Technology area (CPC —)General
Abstract
A fresnel lens employs a design that reduces the transmission of stray light to a viewer located at its entrance pupil, said design requiring directional undercutting of selected facets of the lens so as to align the directionally undercut nonimaging surface parallel to the viewer's line of sight. The facets of the lens are arcuately shaped to yield a closer approximation to a glass lens. The lens is of particular use in a visual image display system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.