Head up display system
US4669810A · kind A · utility
166Cited by
13References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1984 |
| Grant date | Jun 2, 1987 |
| Priority date | — |
| Expiry date | Feb 3, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0145
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A head up display includes a simplified holographic combiner which has a low surface spatial frequency for avoiding flare. Symbology generated by a cathode-ray-tube is focused by relay optics and then reflected by a holographic optical element toward the holographic combiner. The last mentioned holographic optical element is provided with optical power in part compensating for distortions attributable to the large off-axis angle at which the holographic combiner is operated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.