US3663112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head-up display system including a concave reflector and a movable combining mirror
Assignee: BAE Systems PLC
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Filing: 1970-08-10
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Granted: 1972-05-16
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Expires: 1990-08-10
Abstract
Abstract An optical ''''head-up'''' display system for use in aircraft comprises an information display formed by an illuminated fiber optic bundle in a graticule box mounted below the windscreen of the aircraft. An optical projection system comprising a spherical mirror mounted above the windscreen and a semi-reflecting mirror reflect the display to be seen by the pilot superimposed on his view through the windscreen. The display is stabilized in roll by rotating the graticule, and is stabilized in pitch either by moving the semi-reflecting mirror or by moving the relevant part of the graticule.
Inventors
- 👤 Patrick Ludlow Fleming Jones
- 👤 Robert Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:19
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/0101; G02B27/0149; G02B2027/0154; G02B2027/0156
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
166 words
An optical information display apparatus for mounting in the vicinity of an aircraft windscreen to enable pilot viewing of generated visual data simultaneously with the scene observed through the windscreen, said apparatus comprising an optical system including indicia representative of the longitudinal flight condition of the craft for generating the visual data, a combining mirror located adjacent the windscreen in the normal field of view of the pilot, a concave mirror disposed so that its focal plane is coincident with the generated visual data for receiving the light rays thereof transmitted through the combining mirror and directing the rays back to the combining mirror to be reflected therefrom as a collimated data beam whereby the generated visual data appears to the pilot to be located at optical infinity, and means for rotating the combining mirror about an axis parallel to the craft pitch axis for controlling the angle of the collimated data beam directed to the pilot in accordance with the pitch attitude of the craft.
Claim 2
Dependent Claim
166 words
An optical information display apparatus for mounting in the vicinity of an aircraft windscreen to enable pilot viewing of generated visual data simultaneously with the scene observed through the windscreen, said apparatus comprising an optical system including indicia representative of the longitudinal flight condition of the craft for generating the visual data, a combining mirror located adjacent the windscreen in the normal field of view of the pilot, a concave mirror disposed so that its focal plane is coincident with the generated visual data for receiving the light rays thereof transmitted through the combining mirror and directing the rays back to the combining mirror to be reflected therefrom as a collimated data beam whereby the generated visual data appears to the pilot to be located at optical infinity, and means for rotating the combining mirror about an axis parallel to the craft pitch axis for controlling the angle of the collimated data beam directed to the pilot in accordance with the pitch attitude of the craft.
Claim 3
Dependent Claim
42 words
The apparatus of claim 1 wherein said optical system includes a fiber optic assembly for conveying light from light source means in said optical system to a reticle which produces the generated visual image in the focal plane of the concave mirror.
Claim 4
Dependent Claim
40 words
The apparatus of claim 1 wherein the concave mirror and combining mirror are each movable between stowed and operating positions and including means cooperative therewith for precluding energization of the apparatus unless both said mirrors are in the operating position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |