Helmet sight including a graticule image with increasing deviation with helmet displacement
US5200856A · kind A · utility
7Cited by
2References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 11, 1992 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | Feb 11, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/014
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A helmet sight comprises a collimator for projection of the image of a sighting graticule into the ocular field of the wearer of the helmet and sensors for measurement of the angular position of the helmet with respect to a structure, such as the cockpit of an aircraft. The collimator for projection gives the graticule a position whose angular deviation .DELTA.a, .DELTA.b with respect to a reference orientation linked to the helmet has remained an increasing function of the angular displacements of the helmet with respect to the reference structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.