Apparatus for determining the direction of a line of sight
US4722601A · kind A · utility
60Cited by
10References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1984 |
| Grant date | Feb 2, 1988 |
| Priority date | — |
| Expiry date | Jul 19, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0198
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The apparatus comprises a sighting unit, such as helmet 10 carrying a cathode-ray tube 11 and a semi-reflecting screen 13 enabling a user to view a display superimposed on an outside scene. The sighting unit carries a detector unit 15 which determines the movements of the helmet 10 without reference to apparatus external to the helmet, and preferably comprising some form of gyroscopic apparatus. The helmet also carries a boresight detector 16 which forms part of correction means operable to correct automatically from time to time for errors in the output of the detector unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.