CA1089262A
Expired / Lapsed
CA
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System for synthesizing strip-multiplexed holograms
Assignee: Individual
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Filing: 1977-08-22
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Granted: 1980-11-11
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Expires: 1997-08-22
Abstract
Abstract TITLE SYSTEM FOR SYNTHESIZING STRIP-MULTIPLEXED HOLOGRAMS ABSTRACT OF THE DISCLOSURE A system for synthesizing strip-multiplexed holograms, with or without coherent light, from a plurality of two-dimensional images. The two-dimensional images may be formed by a motion picutre film of a rotating subject such that each image is a view of the subject from a different angle. The images are then non-diffusely and anamorphicly projected by a lens system which compresses the image in a first direction and expands the image in a second direction orthogonal to the first direction. The projected image or object beam is then superimposed on the refer-ence beam by a lens-beamsplitter which transforms the substantially planar object beam into a substantially cylindrical wavefront and projects it and the reference beam onto a holographic recording medium. As each two-dimensional image is sequentially projected, the holographic recording medium is shifted so that a plurality of laterally displaced strips are recorded. Alternate embodiments of the system utilize a holographic diffraction grating contact-printed by means of the object beam onto the holographic recording medium instead of a reference beam to produce an interference pattern, a video projection system instead of a cinema film pro-jection system, a three-color image of coherent or nondiffuse light instead of a monochromatic image, and/or three separate holographic diffraction gratings produced by three different mono-chromatic sources of coherent light instead of a single holographic diffraction grating in order to produce multicolor holograms, or a reference beam or reflective surface relief diffraction grating or Fresnel mirror behind the holographic recording medium for synthesis of reflection holograms instead of transmission holograms. The system is capable of synthesizing image plane holograms by using a variety of disclosed processes. Techniques are also disclosed for synthesizing holograms which can be dis-played flat and illuminated with a point light source without introducing image distortion.
Inventors
- 👤 Stephen P. Mcgrew
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-01 06:51
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/0402; G03H1/0406; G03H1/06; G03H1/22; G03H1/24; G03H1/26; G03H1/0486; G03H1/08; G03H1/0891; G03H1/268; G03H2001/2685; G03H2001/2695
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
245 words
A system for synthesizing strip-multiplexed transmission holograms, comprising: image projection means for sequentially generating a plurality of two-dimensional images of coherent, non-diffuse light; anamorphic projection means for compressing said images in a first direction and expanding said images in a second direc-tion to form an elongated object beam, said second direction being orthogonal to said first direction, said anamorphic projection means being positioned directly beyond said image projection means before said object beam has significantly diverged; lens-beamsplitter means spaced apart from said anamorphic projection means, said lens-beamsplitter means being relatively narrow in said first direction and relatively long in said second direction, said lens-beamsplitter transforming said image beam incident on a first face into a substantially cylindrical wave-front, superimposing a second beam incident on a second face onto said cylindrical wavefront, and projecting said cylindrical wave front and said second beam in a direction perpendicular to a third face; reference beam generator means for projecting an elon-gated beam of coherent, nondiffuse light onto the second face of said lens-beamsplitter means during the projection of said object beam onto said lens-beamsplitter means; and holographic recording medium transport means positioned directly beyond the third face of said lens-beamsplitter for se-quentially advancing a holographic recording medium in a prede-termined direction by a predetermined increment for each two-dimensional image generated by said image projection means such that at least one strip hologram is recorded on said re-cording medium for each of said two-dimensional images to form a strip-multiplexed hologram.
Claim 2
Independent Claim
245 words
A system for synthesizing strip-multiplexed transmission holograms, comprising: image projection means for sequentially generating a plurality of two-dimensional images of coherent, non-diffuse light; anamorphic projection means for compressing said images in a first direction and expanding said images in a second direc-tion to form an elongated object beam, said second direction being orthogonal to said first direction, said anamorphic projection means being positioned directly beyond said image projection means before said object beam has significantly diverged; lens-beamsplitter means spaced apart from said anamorphic projection means, said lens-beamsplitter means being relatively narrow in said first direction and relatively long in said second direction, said lens-beamsplitter transforming said image beam incident on a first face into a substantially cylindrical wave-front, superimposing a second beam incident on a second face onto said cylindrical wavefront, and projecting said cylindrical wave front and said second beam in a direction perpendicular to a third face; reference beam generator means for projecting an elon-gated beam of coherent, nondiffuse light onto the second face of said lens-beamsplitter means during the projection of said object beam onto said lens-beamsplitter means; and holographic recording medium transport means positioned directly beyond the third face of said lens-beamsplitter for se-quentially advancing a holographic recording medium in a prede-termined direction by a predetermined increment for each two-dimensional image generated by said image projection means such that at least one strip hologram is recorded on said re-cording medium for each of said two-dimensional images to form a strip-multiplexed hologram.
Claim 3
Dependent Claim
74 words
The system of claim 1 wherein said image projection means comprise a cinema film projector system including cinema film transport means for sequentially advancing a strip of cinema film in single frame increments past a fixed projection aperture, and illumination means for projecting a beam of coherent, non-diffuse light through said projection aperture thereby projecting a beam of coherent, nondiffuse light modulated by the images on said cinema film onto said anamorphic projection system.
Claim 4
Dependent Claim
79 words
The system of claim 1 wherein said image projection means comprise: a video projection kinescope including electron gun means directing electrons to the face of said video projection kinescope in accordance with a video signal; and means for generating a beam of coherent, nondiffuse light and projecting it onto the face of said video projection kinescope such that said face modulates the coherent, nondiffuse light in accordance with the electron pattern on said face corresponding to said video signal.
Claim 5
Dependent Claim
74 words
The system of claim 1, wherein 5 aid image projection means comprise: an incoherent-to-coherent image convertor including means for focusing a sequence of images onto the input face of said incoherent-to-coherent image convertor; and means for generating a beam or coherent, nondiffuse light and directing it onto said image convertor such that said image convertor spatially modulates said beam of light in accordance with said images focused onto the input face of said convertor.
Claim 6
Dependent Claim
68 words
The system of claim 1, wherein said anamorphic projection means comprise a cylindrical lens placed directly beyond said image projection means with the axis of said cyl-indrical lens extending along said second direction, said anamorphic projection means further including a spherical lens placed beyond the focal length of said cylindrical lens thereby causing said images to diverge along said second direction without diverging substantially along said first direction.
Claim 7
Dependent Claim
47 words
The system of claim 1, wherein said anamorphic projection means comprise a cylindrical lens positioned beyond said image projection means, said cylindrical lens having its axis extending along said first direction whereby said image diverges along said second direction without diverging sub stantially along said first direction.
Claim 8
Dependent Claim
44 words
The system of claim 1, wherein said anamorphic projection means comprise a spherical lens followed by a cyl-indrical lens having its axis extending along said first direction thereby diverging said image in said second direction without substantially diverging said image along said first direction.
Claim 9
Dependent Claim
69 words
The system of claim 1, wherein said lens-beamsplitter means comprise a pair of elongated triangular prisms separated by a partially reflective, partially trans-missive layer, one of said prisms having an elongated cyl-indrical lens secured to one face thereof such that a wavefront incident on said cylindrical lens is transformed into a sub-stantially cylindrical wavefront and superimposed on a wavefront transmitted through an adjacent face of one of said prisms.
Claim 10
Dependent Claim
38 words
The system of claim 1, wherein said lens-beamsplitter means comprise a pair of elongated triangular prisms separated by a partially reflective, partially trans-missive layer, said prisms having an elongated cylindrical lens secured to three faces of said prisms.
Claim 11
Dependent Claim
69 words
The system of claim 1, wherein said lens-beamsplitter means comprise: a first elongated prism having first and second planar faces and a third concave face therebetween; and a second elongated prism having first and second planar faces and a third convex face therebetween, the con-cave face of said first prism and the convex face of said second prism flushly contacting opposite sides of a partially reflective, partially transmissive layer.
Claim 12
Dependent Claim
44 words
The system of claim 1, wherein said lens-beamsplitter means comprise an elongated cylindrical lens followed by an elongated beamsplitter oriented so that a wavefront transformed by the cylindrical lens is superimposed upon another wavefront by means of the beam combining property of the beamsplitter.
Claim 13
Dependent Claim
88 words
The system of claim 1, further including means for synthesizing holograms viewable flat without significant distortion using a point light source comprising reference beam control means for adjusting the angle of incidence of said reference beam on said lens-beamsplitter-means as each image is recorded on said holographic recording medium such that the angle of incidence of said reference beam on said holographic recording medium for each strip hologram corre-sponds to the angle at which said point light source strikes each strip hologram when said hologram is displayed flat.
Claim 14
Dependent Claim
101 words
The system of claim 12, wherein said reference beam control means comprise: a mounting platform including means for moving said platform along an axis parallel to the second face and perpen-dicular to the first face of said lens-beamsplitter means in precisely controlled increments; a turntable rotatably mounted on said mounting platform including means for rotating said turntable in precisely controlled increments; and a reference beam projector fixedly mounted on said turntable for projecting said reference beam onto said lens-beamsplitter from a position controlled by the position of said mounting platform and at an angle controlled by the angle of said turntable.
Claim 15
Dependent Claim
34 words
The system of claim 1, further including means for synthesizing multicolor holograms comprising a movable reference beam projector for con-trolling the angle at which a particular color component of the recorded image is reconstructed.
Claim 16
Dependent Claim
60 words
The system of claim 1, further including means for synthesizing multicolor holograms comprising a plurality of reference beam generator means for projecting a plurality of elongated beams of coherent, nondiffuse light of differing colors onto the second face of said lens-beamsplitter means during coherent, nondiffuse projection of said images in differing colors onto the first face of said lens-beamsplitter means.
Claim 17
Dependent Claim
28 words
The system of claim 1, further including a spatial filter position-ed at the focus of a lens for enhancing and suppressing predetermined spatial frequencies in the two-dimensional images.
Claim 18
Dependent Claim
81 words
The system of claim 1, further including means for laterally displacing the image modulation for each of said strip holograms relative to its phase moduiation such that the image modulation is displaced in the direction of the center of the strip-multiplexed hologram with respect fo its grating pattern by an amount which varies with distance from the center of said hologram thereby generating a strip-multiplexed hologram which may be viewed flat without sub-stantial distortion when illuminated with a point illumination source.
References Cited (Backward Citations)
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