Patent EP0632349A1 successfully refreshed from Google Patents.
EP0632349A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Reflection integral holography - method and apparatus
Assignee: ZABKA, JAMES BRITTON
•
Filing: 1993-06-29
•
Granted: —
•
Expires: 2013-06-29
Abstract
Abstract Apparatus and method for storing holographic synthesized information for reflection integral Bragg holograms, free of the limitations of dispersing elements (such as unilateral diffusing screens, conventional lenticular screens and Fresnel lenses), multiple reference beams, mirrorized indexing or other similar materials or techniques. These holograms accurately satisfy Bragg's condition, provide an expanded (and essentially normal) vertical viewing range and can be displayed both flat (in which case the image is behind the film plane) or concave towards the viewer (in which case the image is in front of the film plane). Flat and curved holograms can be combined together. The final holographic images are produced directly from motion picture film, without intermediate transfer prints as required by the prior art. All are front illuminated. By curving the developed hologram for viewing a high definition projection image is obtained.
Inventors
- 👤 James Britten Zapka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 15:17
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/0402; G03H1/0406; G03H1/02; G03H1/024; G03H1/0248; G03H1/26; G03H2001/043; G03H1/268; G03H2001/2685
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
140 words
A method of producing integral reflection holograms comprising the steps of: a. providing information in the form of one or more transparencies: b. illuminating said information with an object beam of non-diffused light, said object beam having an optical axis; c. bringing the image of said information to substantially a line focus; d. placing a holographic image recording medium, curved about an axis to form oppositely facing convex and concave surfaces, in the path of said object beam close to said line focus, with said convex surface of said holographic image recording medium facing said object beam and with said axis of curvature of said surfaces perpendicular to said line focus; and e. exposing said concave surface of said holographic image recording medium with a reference beam, which is superimposed over the object beam at said holographic image recording medium.
Claim 2
Dependent Claim
26 words
The method of claim 1, wherein said axis of curvature of said surfaces is positioned to intersect said optical axis of said object beam at 90°.
Claim 3
Dependent Claim
45 words
The method as set forth in Claim 1 wherein, said holographic image recording medium is exposed to a sequence of said transparencies, said holographic image recording medium being moved in a direction parallel to said axis of curvature of said surfaces after each successive exposure.
Claim 4
Dependent Claim
29 words
The method as set forth in claim 3, wherein after exposure said holographic image recording medium is viewed flat and said hologram appears behind said holographic image recording medium.
Claim 5
Dependent Claim
44 words
The method as set forth in claim 3, wherein, after exposure said holographic image recording medium is supported for viewing on the concave side of a surface curved about a vertical axis, whereby said hologram appears in front of said holographic image recording medium.
Claim 6
Dependent Claim
44 words
The method as set forth in claim 5, wherein, after exposure, said holographic image recording medium can be viewed simultaneously with a second exposed holographic image recording medium; one of said mediums being flat, the other of said mediums being curved toward a viewer.
Claim 7
Dependent Claim
40 words
The method as set forth in claim 3, further including the step of supporting said exposed holographic recording medium on a flexible surface means whereby said exposed holographic image recording medium can be viewed flat or curved toward a viewer.
Claim 8
Dependent Claim
44 words
The method as set forth in claim 1 wherein said line focus is accomplished by cylindrical lens means and wherein said information is focused in a plane which is perpendicular to said optical axis of said object beam and adjacent to said convex surface.
Claim 9
Dependent Claim
43 words
The method of claim 8, wherein the position and orientation of said cylindrical lens means relative to said convex surface is varied, to vary the size of the image produced by the hologram and its depth relative to said holographic image recording medium.
Claim 10
Dependent Claim
54 words
The method as set forth in claim 8, wherein after exposure, said holographic image recording medium is supported for viewing on the concave side of a surface curved about a vertical axis, and wherein the curvature of said viewing support surface is varied depending upon said orientation and position of said cylindrical lens means.
Claim 11
Dependent Claim
26 words
The method of claim 1, wherein said reference beam, when it is incident to said concave surface, is in the form of a narrow filtered strip.
Claim 12
Dependent Claim
19 words
The method of claim 11, wherein said reference beam is maintained in a fixed location during said exposure step.
Claim 13
Dependent Claim
193 words
Apparatus for forming reflection holograms, said apparatus comprising: a. means for providing a beam of coherent light; b. means for dividing said beam into an object beam, having an object beam axis, and a reference beam, having a reference beam axis; c. means for supporting a transparency having an image thereon along said object beam axis in the path of said object beam; d. means, positioned along said object beam axis, for converging said object beam and said image to a line focus perpendicular to said object beam axis; e. means, positioned along said object beam axis, for supporting a recording medium adjacent to the position of said line focus, said recording medium and said means for supporting said recording medium being curved about an axis which is perpendicular to both said object beam axis and said line focus, to form both convex and concave sides, said convex sides of both said recording medium and said means for supporting said recording medium facing toward said means for supporting said transparency; and f. means for directing said reference beam to said concave surface of said recording medium in superimposed relation to said object beam.
Claim 14
Dependent Claim
22 words
The apparatus as set forth in claim 13, wherein said means for converging said object beam includes at least one cylindrical lens.
Claim 15
Dependent Claim
37 words
The apparatus as set forth in claim 14, wherein the position of said cylindrical lens along said object beam axis and relative to said convex side of said means for supporting said recording medium can be varied.
Claim 16
Dependent Claim
49 words
The apparatus as set forth in claim 13, further including apparatus for supporting said recording medium after exposure, said apparatus for supporting being curved about a vertical axis, with the concave side facing toward the viewer, and further including means for varying the curvature of said apparatus for supporting.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.