US3844645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-dimensional projection system
Assignee: HOLOGRAPH CORP
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Filing: 1972-07-07
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Granted: 1974-10-29
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Expires: 1992-07-07
Abstract
Abstract A three-dimensional projection system is provided by projecting a two-dimensional image upon a screen from a first image generating source and by additionally projecting from a second image generating source, an image suspended in space to a viewer with the latter image being created either by transmission through the screen or by reflection from the screen.
Inventors
- 👤 H Forster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:28
CPC Classifications
G; G03; G03B; G03B35/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
132 words
A three-dimensional projection system comprising: a screen; first image generating means for projecting a two-dimensional image onto the surface of said screen for reflection therefrom to be viewed by an observer; and second image generating means for projecting an aerial image, said screen comprising means for passing the aerial image generated by said second means through said screen whereby the aerial image generated by said second means is directed toward said screen and suspended in space a spaced distance from the surface of said screen; the aerial image projected by said second image generating means cooperating with said image provided by said two-dimensional projecting means, however, to establish an overall threedimensional display having depth and exhibiting relative intensities between said two-dimensional image and said aerial image in accordance with their respective illuminations.
Claim 2
Dependent Claim
132 words
A three-dimensional projection system comprising: a screen; first image generating means for projecting a two-dimensional image onto the surface of said screen for reflection therefrom to be viewed by an observer; and second image generating means for projecting an aerial image, said screen comprising means for passing the aerial image generated by said second means through said screen whereby the aerial image generated by said second means is directed toward said screen and suspended in space a spaced distance from the surface of said screen; the aerial image projected by said second image generating means cooperating with said image provided by said two-dimensional projecting means, however, to establish an overall threedimensional display having depth and exhibiting relative intensities between said two-dimensional image and said aerial image in accordance with their respective illuminations.
Claim 3
Dependent Claim
58 words
The three-dimensional projection system of claim 1 wherein said first image projecting means and said second image generating means are positioned on opposite sides of said screen and wherein said screen is constructed of an open-weave mesh to permit transmission of said aerial image therethrough to be produced a spaced distance from the viewing surface of said screen.
Claim 4
Dependent Claim
53 words
The three-dimensional projection system of claim 2 wherein said screen is of mesh construction having a substantially uniform distribution of openings in the viewing surface thereof for viewing the image provided by said two-dimensional projecting means and permitting the transmission of the rays forming said aerial image through the opening of said mesh.
Claim 5
Dependent Claim
46 words
The three-dimensional projection system of claim 1 wherein said first and second image generating means are positioned on the opposite sides of said screen and wherein said screen comprises a partially reflecting surface to reflect said aerial image to be developed in front of said screen.
Claim 6
Dependent Claim
58 words
The three-dimensional projection system of claim 4 wherein said first and second image generating means are positioned on opposite sides of said screen and wherein said screen is constructed to permit transmission of said aerial image therethrough to be developed in front of said screen, between said two-dimensional projecting means and the image on the screen formed thereby.
Claim 7
Dependent Claim
56 words
The three-dimensional projection system of claim 4 wherein said first and second image generating means are positioned on the same side of said screen and wherein said screen is constructed to reflect said second image to be developed in front of said screen, between said two-dimensional projecting means and the image on the screen formed thereby.
Claim 8
Dependent Claim
33 words
The three-dimensional projection system of claim 4 wherein the reflecting surface comprising a partially silvered mirror reflects the image provided by said two-dimensional projecting means and permitting transmission therethrough of said aerial image.
Claim 9
Dependent Claim
62 words
The three-dimensional projection system of claim 3 wherein said second means is positioned relative to said screen such that said aerial image tends to appear in back of said screen, and wherein said screen reflects the light waves forming the aerial image to create said aerial image in front of the two-dimensional projected image projected upon the viewing surface of the screen.
Claim 10
Dependent Claim
58 words
The three-dimensional projection system of claim 1 wherein a reflecting mirror is positioned behind said screen wherein the rays forming the aerial image developed by said second means is positioned to pass through said screen toward said mirror and are reflected thereby to pass through said screen such that the aerial image appears in front of said screen.
Claim 11
Dependent Claim
18 words
The three-dimensional projection system of claim 1 wherein said second means source comprises a holographic display generating means.
Claim 12
Dependent Claim
36 words
The three-dimensional projection system of claim 1 wherein said second means comprises a Fresnel lens, a light source directing light toward said lens and one or more transparencies positioned between said light source and said lens.
Claim 13
Dependent Claim
60 words
The three-dimensional projection system of claim 1 wherein said first and second image generating means are positioned on the same side of said screen and wherein said screen is constructed to permit transmission of said aerial image therethrough to be developed in front of said screen, in front of the two-dimensional image formed on said screen by said projecting means.
Claim 14
Dependent Claim
39 words
The three-dimensional projection system of claim 1, wherein said first and second image generating means are positioned on the same side of said screen, and Wherein said screen is constructed to permit transmission of both of said images therethrough.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |