Combiner alignment detector for head up display system
US4775218A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 1987 |
| Grant date | Oct 4, 1988 |
| Priority date | — |
| Expiry date | Apr 17, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0154
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A head up display system includes a combiner alignment detector (24) that determines whether the combiner (22) and a cathode-ray tube (CRT) (18) are aligned within a preassigned operational tolerance. The CRT emits display symbology that reflects off the combiner toward an observer. The combiner is secured to a combiner bracket (38) which is pivotally mounted to a mounting structure (70) having a stationary relationship with the CRT. A light emitting diode (LED) (86) and a light-sensitive linear position detector (88) are secured to the mounting structure. Light rays emanating from the LED are reflected by a mirror (34), which is secured to the combiner bracket, and strike the position detector. Pivotal motion of the combiner bracket relative to the mounting structure results in movement of the mirror relative to the LED and the position detector. The pivotal motion of the mirror causes light reflected by the mirror to strike varying locations on the position detector, which provides corresponding output signals. A processing circuit (110) receives the signals provided by the detector and provides to a control circuit (129) a signal corresponding to the alignment of the combiner an…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.