US4560233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color head up display system
Assignee: Qinetiq Ltd
•
Filing: 1984-02-06
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Granted: 1985-12-24
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Expires: 2004-02-06
Abstract
Abstract A head up display system including a light emissive object at an object plane and a collimator and combiner to provide a collimated image for viewing at an eye plane overlaid on a view through the combiner. The object emits light in at least two chromatically separated emission wavebands and by a diffractive optical element in the light path from object plane to eye plane having narrow band reflection characteristics at each emission wavelength.
Inventors
- 👤 John R. Banbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:47
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/0101; G02B27/0103; G09; G09G; G09G1/00; G09G1/28; G02B2027/0105; G02B2027/0107; G02B2027/0112; G02B2027/0116
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
A head up display system including a light emissive object at an object plane, optics including a collimator and a combiner arranged to provide a collimated image of the object for viewing at an eye plane overlaid on a view through the combiner, the optics being arranged for optimum accuracy over a narrow band of wavelengths characterized in that the object emits light in at least two chromatically separated emission wavebands and by a diffractive optical element in the light path from object plane to eye plane having narrow band reflection characteristics at each emission waveband.
Claim 2
Dependent Claim
96 words
A head up display system including a light emissive object at an object plane, optics including a collimator and a combiner arranged to provide a collimated image of the object for viewing at an eye plane overlaid on a view through the combiner, the optics being arranged for optimum accuracy over a narrow band of wavelengths characterized in that the object emits light in at least two chromatically separated emission wavebands and by a diffractive optical element in the light path from object plane to eye plane having narrow band reflection characteristics at each emission waveband.
Claim 3
Dependent Claim
30 words
A head up display system as claimed in claim 1 and characterized in that the relative intensity of light emitted in each emission waveband is controlled to provide intermediate colors.
Claim 4
Dependent Claim
29 words
A head up display system as claimed in claim 1 and characterized in that an object is formed at a different magnification as light in each waveband is emitted.
Claim 5
Dependent Claim
26 words
A head up display system as claimed in claim 1 and characterized in that different geometrial correction is applied as light in each waveband is emitted.
Claim 6
Dependent Claim
44 words
A head up display system as claimed in claim 1 and including a diffractive optical element exhibiting a different focal length at each emission waveband such that light in each waveband from the object forms a correctly collimated color image at the image plane.
Claim 7
Dependent Claim
28 words
A head up display system as claimed in claim 5 and wherein a diffractive optical element exhibiting different focal lengths is constructed by recording spaced apart fringe patterns.
Claim 8
Dependent Claim
22 words
A head up display system as claimed in claim 1 and characterized in that the emission wavebands are at two contrasting colors.
Claim 9
Dependent Claim
35 words
A head up display system as claimed in claim 1 and characterized in that the emission wavebands are at three primary colors such that intermediate colors may be provided by additive mixing of the primaries.
Claim 10
Dependent Claim
16 words
A head up display system as claimed in claim 1 and including a cathode ray tube.
Claim 11
Dependent Claim
23 words
A head up display system as claimed in claim 9 and wherein the cathode ray tube has a phosphor of the penetron type.
Claim 12
Dependent Claim
45 words
A head up display system as claimed in claim 10 and wherein emission is restricted to wavebands of the penetron phosphor components and intermediate colors achieved by varying the writing speed or electrical drive to the cathode ray tube when each phosphor component is energized.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |