US4500163A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holographic projection screen
Assignee: Raytheon Co
•
Filing: 1981-07-29
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Granted: 1985-02-19
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Expires: 2001-07-29
Abstract
Abstract A projection screen is formed as at least one reflective holograms each of which, when referenced with a projector, reconstructs a defined observation pupil.
Inventors
- 👤 Richard H. Burns
- 👤 William M. Hall
- 👤 Bernard P. Hildebrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:02
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G02; G02B; G02B5/00; G02B5/32; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/30; G09B9/32; G09B9/326
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
64 words
A front projection viewing screen having a fixed size observation pupil at a predetermined position relative to the screen, said screen comprising an array of a plurality of elemental screen areas wherein each of said elemental screen areas is formed of at least one elemental reflective hologram of the observation pupil, and wherein each of said holograms is made with a specular object beam.
Claim 2
Dependent Claim
64 words
A front projection viewing screen having a fixed size observation pupil at a predetermined position relative to the screen, said screen comprising an array of a plurality of elemental screen areas wherein each of said elemental screen areas is formed of at least one elemental reflective hologram of the observation pupil, and wherein each of said holograms is made with a specular object beam.
Claim 3
Dependent Claim
25 words
The screen according to claim 1 wherein said screen is of generally spherical shape and said observation pupil is within the sphere of said screen.
Claim 4
Dependent Claim
26 words
The screen according to claim 1 wherein said screen is of generally spherical shape and wherein said elemental holograms disposed at a given height are identical.
Claim 5
Dependent Claim
26 words
The screen according to claim 1 wherein each of said elemental holograms is formed with an object beam focused at a point behind said elemental hologram.
Claim 6
Dependent Claim
38 words
The screen according to claim 4 wherein during the formation of each of said elemental holograms a masked aperture is positioned between said point and said elemental hologram to direct light from said point to said observation pupil.
Claim 7
Independent Claim
91 words
A method for producing a front projection viewing screen having a fixed size observation pupil at a predetermined position relative to said screen comprising the steps of: (a) forming a plurality of elemental reflective holograms of said observation pupil using a specular object beam in each such formation; and (b) arranging said elemental holograms in an array to form the viewing surface of said screen; wherein each of said elemental holograms is formed at a position relative to said observation pupil that each of said elemental holograms has in said array.
Claim 8
Independent Claim
91 words
A method for producing a front projection viewing screen having a fixed size observation pupil at a predetermined position relative to said screen comprising the steps of: (a) forming a plurality of elemental reflective holograms of said observation pupil using a specular object beam in each such formation; and (b) arranging said elemental holograms in an array to form the viewing surface of said screen; wherein each of said elemental holograms is formed at a position relative to said observation pupil that each of said elemental holograms has in said array.
Claim 9
Dependent Claim
28 words
The method according to claim 6 wherein the arranging step includes the step of positioning said elemental holograms to form a generally spherical screen around said observation pupil.
Claim 10
Dependent Claim
50 words
The method according to claim 6 wherein the arranging step includes the step of positioning said elemental holograms to form a generally spherical screen and wherein during the forming step all of said elemental holograms which are to be positioned at a given height are formed to be mutually identical.
Claim 11
Dependent Claim
25 words
The method according to claim 6 wherein the forming step includes the step of focusing said object beam at a point behind said elemental hologram.
Claim 12
Dependent Claim
36 words
The method according to claim 9 wherein the forming step further includes the step of positioning a masked aperture between said point and said elemental hologram to direct light from said point to said observation pupil.
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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) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |