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US 5,734,485 AGranted
Large display composite holograms and methods
AssigneeRocky Research
InventorsHermann-Stephan Buchkremer, Uwe Rockenfeller
Life of this patent
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Abstract
A composite hologram incorporates a plurality of hologram tiles arranged for display, each of the hologram tiles formed by exposing each of a plurality of different unexposed photographic plates simultaneously to light scattered by an intermediate hologram using a conjugate complex of a first reference wave from a coherent light source and to a second reference wave from the coherent light source.
Claims33
A method of forming a hologram capable of being viewed by an observer moving generally horizontally and parallel thereto comprising the steps:
- (a) recording sequential images of an object;
- (b) forming an intermediate hologram comprising:
- horizontally aligning a plurality of unexposed first photographic plates,
- projecting the recorded images sequentially on a projection screen using a first beam from a first coherent light source and sequentially exposing the horizontally aligned first photographic plates to the sequential images projected on the projection screen through a slit aperture by horizontally moving a mask having an elongated vertical slit aperture along said plurality of first photographic plates and sequentially exposing the individual sequential images directed from the projection screen through the elongated slit on successive horizontal first photographic plates, and simultaneously therewith exposing said first photographic plates to a second beam from said first coherent light source through the elongated slit, said second beam comprising a diverging first reference wave R.sub.1,
- developing the exposed first photographic plates to form a plurality of first holographic tiles, and
- horizontally positioning said plurality of first holographic tiles in successive sequence to form said intermediate hologram;
- and
- (c) forming segments of a master hologram comprising:
- providing a frame having at least one horizontal row having a plurality of frame elements each for securing a different tile of a plurality of second holographic tiles,
- securing a plurality unexposed second photographic plates each in a different frame element in said frame, said second photographic plates being covered to prevent exposure thereof;
- forming a plurality of segments of a master hologram by sequentially uncovering each of said second photographic plates and successively exposing the second photographic plates to said intermediate hologram by directing a wave R.sub.1 * from a second coherent light source comprising the conjugate complex of said first reference wave R.sub.1 diffracted from said intermediate hologram onto each of said second photographic plates and simultaneously therewith directing a converging second reference wave R.sub.2 from said second coherent light source onto each of said second photographic plates, and
- developing said exposed second photographic plates to form second holographic tiles comprising said segments of a master hologram.
9 more elements
A method of forming a hologram capable of being viewed by an observer moving generally horizontally and parallel thereto comprising the steps:
- (a) obtaining a plurality of film strips of recorded images of an object;
- (b) from each of said film strips forming an intermediate hologram comprising:
- horizontally aligning a plurality of unexposed first photographic plates,
- projecting the recorded images sequentially on a projection screen using a first beam from a first coherent light source and sequentially exposing the horizontally aligned first photographic plates to the sequential images projected on the projection screen through a slit aperture by horizontally moving a mask having an elongated vertical slit aperture along said plurality of first photographic plates and sequentially exposing the individual sequential images directed from the projection screen through the elongated slit on successive horizontal first photographic plates, and simultaneously therewith exposing said first photographic plates to a second beam from said first coherent light source through the elongated slit, said second beam comprising a diverging first reference wave R.sub.1,
- developing the exposed first photographic plates to form a plurality of first holographic tiles, and
- horizontally positioning said plurality of first holographic tiles in successive sequence to form said intermediate hologram;
- (c) vertically stacking a plurality of intermediate holograms formed in step (b);
- and
- (d) forming segments of a master hologram comprising:
- providing a frame having a plurality of horizontal rows having a plurality of frame elements each for securing a different tile of a plurality of second holographic tiles,
- securing a plurality unexposed second photographic plates each in a different frame element in said frame,
- forming a plurality of segments of a master hologram by exposing the second photographic plates to said intermediate hologram by directing a wave R.sub.1 * from a second coherent light source comprising the conjugate complex of said first reference wave R.sub.1 diffracted from said intermediate hologram onto each of said second photographic plates and simultaneously therewith directing a converging second reference wave R.sub.2 from said second coherent light source onto each of said second photographic plates, and
- developing said exposed second photographic plates to form second holographic tiles comprising said segments of a master hologram.
10 more elements
Dependencies are inferred from the claim text.