Display systems
US4167113A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 25, 1977 |
| Grant date | Sep 11, 1979 |
| Priority date | — |
| Expiry date | Nov 25, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C23/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A head-up display system for an aircraft has a display unit which projects a display of symbology representing the aircraft flight parameters onto a separately mounted partially-transparent reflector positioned in front of the aircraft pilot, so that the pilot sees an image of the display against the external scene. The display unit has a sensor which receives an image of the display via the reflector. The sensor responds to displacement of this image from a reference established with respect to the display unit, caused by movement of the reflector relative to the display unit, and the display is correspondingly modified to compensate for such movement. The display unit may include a cathode-ray tube for providing the display which can be modified by adjustment of the deflection of the cathode-ray beam. In this case the reference established with respect to the display unit may be an instantaneous point image of the cathode-ray beam. A light source may be mounted with the display unit and the sensor may be arranged to respond additionally to displacement of an image of this light source received via the reflector. The light source may be located at a position spaced from the center…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.