EP0405540A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Dispersion-compensated windshield hologram virtual image display
Assignee: Raytheon Co
•
Filing: 1990-06-28
•
Granted: —
•
Expires: 2010-06-28
Abstract
Abstract A virtual image display including an image hologram (15A), a dispersion compensating hologram (13A) for providing playback illumination to the image hologram (15A), and an illumination source (11) for providing playback illumination to the dispersion compensating hologram (13A).
Inventors
- 👤 Ronald T. Smith
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 18:27
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: 8
Claim 1
Independent Claim
74 words
A virtual image display, characterized by - an image hologram (15A) having an image recorded therein; - a source (11) of illumination; - compensating means responsive to said sourve illumination for providing to said image hologram (15A) playback illumination that is chromatically predispersed so as to compensate for the chromatic dispersion of said image hologram (15A), said image hologram (15A) producing in response to said playback illumination a virtual image of said recorded image.
Claim 2
Dependent Claim
74 words
A virtual image display, characterized by - an image hologram (15A) having an image recorded therein; - a source (11) of illumination; - compensating means responsive to said sourve illumination for providing to said image hologram (15A) playback illumination that is chromatically predispersed so as to compensate for the chromatic dispersion of said image hologram (15A), said image hologram (15A) producing in response to said playback illumination a virtual image of said recorded image.
Claim 3
Dependent Claim
18 words
The virtual image display of claim 1, characterized in that said compensating means comprises a dispersing hologram (13A).
Claim 4
Dependent Claim
28 words
The virtual image display of claims 1 or 2, characterized in that said image hologram (15A) produces a virtual image that is displaced from said image hologram (15A).
Claim 5
Dependent Claim
31 words
The virtual image display of any one of claims 1 through 3, characterized in that said image hologram (15A) produces a virtual image having image components located at different image planes.
Claim 6
Dependent Claim
23 words
The virtual image display of any one of claims 1 through 4, characterized in that said illumination is a spetrally broadband source (11).
Claim 7
Dependent Claim
23 words
The virtual image display of any one of claims 1 through 5, characterized in that said image hologram (15A) comprises a reflection hologram.
Claim 8
Dependent Claim
53 words
A virtual image display for a vehicle having a windshield according to any one of claims 1 through 6, characterized by - 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 opertor of the vehicle.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.