US4981332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersion-compensated windshield hologram virtual image display
Assignee: Delphi Technologies Inc
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Filing: 1989-06-29
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Granted: 1991-01-01
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Expires: 2009-06-29
Abstract
Abstract A virtual image display including an image hologram, a dispersion compensating hologram for providing playback illumination to the image hologram, and an illumination source for providing playback illumination to the dispersion compensating hologram.
Inventors
- 👤 Ronald T. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:44
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/0101; G02B27/0103; G02B2027/0109; G02B2027/0112; G02B2027/0116; G02B2027/0145
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
101 words
A virtual image display comprising: an image hologram having a plurality of image components recorded therein, said image components configured to produce virtual image components at different virtual image planes; a source of illumination; compensating means responsive to said source illumination for providing to said image hologram playback illumination that is chromatically predispersed so as to compensate for the chromatic dispersion of said image hologram, said image hologram producing in response to said playback illumination virtual image components of said recorded image components which are relatively sharp over a depth of field greater than would be produced without said compensation means.
Claim 2
Dependent Claim
101 words
A virtual image display comprising: an image hologram having a plurality of image components recorded therein, said image components configured to produce virtual image components at different virtual image planes; a source of illumination; compensating means responsive to said source illumination for providing to said image hologram playback illumination that is chromatically predispersed so as to compensate for the chromatic dispersion of said image hologram, said image hologram producing in response to said playback illumination virtual image components of said recorded image components which are relatively sharp over a depth of field greater than would be produced without said compensation means.
Claim 3
Dependent Claim
15 words
The virtual image display of claim 1 wherein said compensating means comprises a dispersing hologram.
Claim 4
Dependent Claim
22 words
The virtual image display of claim 1 wherein said image hologram produces a virtual image that is displaced from said image hologram.
Claim 5
Dependent Claim
15 words
The virtual image display of claim 1 wherein said illumination is a spectrally broadband source.
Claim 6
Dependent Claim
15 words
The virtual image display of claim 1 wherein said image hologram comprises a reflection hologram.
Claim 7
Dependent Claim
14 words
The virtual image display of claim 1 wherein said virtual image components are overlapping.
Claim 8
Dependent Claim
82 words
A virtual image display comprising: an image hologram having an image recorded therein; a source of spectrally broadband illumination; a dispersing hologram responsive to said source illumination for providing to said image hologram playback illumination that is chromatically predispersed so as to compensate for the chromatic dispersion of said image hologram, said image hologram producing in response to said playback illumination a virtual image of said recorded image having a depth of field greater than would be produced without said compensation means.
Claim 9
Dependent Claim
82 words
A virtual image display comprising: an image hologram having an image recorded therein; a source of spectrally broadband illumination; a dispersing hologram responsive to said source illumination for providing to said image hologram playback illumination that is chromatically predispersed so as to compensate for the chromatic dispersion of said image hologram, said image hologram producing in response to said playback illumination a virtual image of said recorded image having a depth of field greater than would be produced without said compensation means.
Claim 10
Dependent Claim
22 words
The virtual image display of claim 7 wherein said image hologram produces a virtual image that is displaced from said image hologram.
Claim 11
Dependent Claim
24 words
The virtual image display of claim 7 wherein said image hologram produces a virtual image having image components located at different virtual image planes.
Claim 12
Dependent Claim
14 words
The virtual image display of claim 9 wherein said virtual image components are overlapping.
Claim 13
Dependent Claim
108 words
A virtual image display for a vehicle having a windshield, comprising: an image reflection hologram having an image recorded therein and supported by the vehicle windshield for producing pursuant to playback illumination a virtual image viewable by the operator of the vehicle; a source of illumination compensating means responsive to said source illumination for providing to said image hologram playback illumination that is chromatically predispersed so as to compensate for the chromatic dispersion of said image hologram, said image hologram producing in response to said playback illumination a virtual image of said recorded image having a depth of field greater than would be produced without said compensation means.
Claim 14
Dependent Claim
108 words
A virtual image display for a vehicle having a windshield, comprising: an image reflection hologram having an image recorded therein and supported by the vehicle windshield for producing pursuant to playback illumination a virtual image viewable by the operator of the vehicle; a source of illumination compensating means responsive to said source illumination for providing to said image hologram playback illumination that is chromatically predispersed so as to compensate for the chromatic dispersion of said image hologram, said image hologram producing in response to said playback illumination a virtual image of said recorded image having a depth of field greater than would be produced without said compensation means.
Claim 15
Dependent Claim
15 words
The virtual image display of claim 11 wherein said compensating means comprises a dispersing hologram.
Claim 16
Dependent Claim
22 words
The virtual image display of claim 11 wherein said image hologram produces a virtual image that is displaced from said image hologram.
Claim 17
Dependent Claim
23 words
The virtual image display of claim 11 wherein said image hologram produces a virtual image having image components located at different image planes.
Claim 18
Dependent Claim
14 words
The virtual image display of claim 14 wherein said virtual image components are overlapping.
Claim 19
Dependent Claim
15 words
The virtual image display of claim 11 wherein said illumination is a spectrally broadband source.
References Cited (Backward Citations)
US4613200A
Cited
US4737001A
Cited
US4790613A
Cited
US4795223A
Cited
US4807951A
Cited
JPS63194201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |