Apparatus for making holograms including a variable beam splitter assembly

Patent 5745267 Issued on April 28, 1998. Estimated Expiration Date:

August 15, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3542449

3560210

3614426

3652144

3903360

Layer-wise reproduction of three-dimensional objects by simultaneous super-position of encoded images
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Light writing type projection display using polymer-dispersed liquid crystal and liquid crystal television set as image light source
Patent #: 5260815
Issued on: 11/09/1993
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Inventor

Hart, Stephen J.

Assignee

Voxel

Application

No. 698119 filed on 08/15/1996

US Classes:

359/35, Hardware for producing a hologram359/24Superimposed holograms only

Examiners

Primary: Henry, Jon W.

Attorney, Agent or Firm

Snell & Wilmer L.L.P.

Foreign Patent References

2140170 GB 05/13/1984

International Classes

G03H 001/18
G03H 001/28

Abstract

A method and apparatus for making holograms includes a technique for exposing a film substrate or other light-sensitive medium to consecutive two dimensional images, together representative of a physical three-dimensional system, to generate a three dimensional hologram of the physical system. Low beam ratios are employed to superimpose multiple (20-300) images on the substrate. Each image is relatively weak, but the combination of the series of weak images ultimately appears as a single clearly defined hologram.

Other References

A.P. Yakimovich, "Three-dimensional holographic display", Sov. J. Quantum Elect. 11(1), pp. 78-81, Jan. 1981
E.G. Nassimbene et al, "Reducing noise in holograms", I.B.M. Tech. Dis. Bull. vol. 8, No. 10, p. 1396, Mar. 1966
H. Nomura et al, "Storage density limitation of a volume-type hologram memory:theory", Applied Optics, vol. 15, No. 2, pp. 550-555, Feb. 1976
K. Johnson et al, "Multiple storage of holograms in an organic medium", Applied Physics Letters, vol. 28, No. 9, pp. 506-507, Dec. 1985
R. A. Bartolini et al, "Multiple storage of holograms in an organic medium", Applied Physics Letters, vol. 28, No. 9, pp. 506-507, May 1976
W. J. Burke et al, "crosstalk noise from multiple thick-phase holograms", J. Appl. Phys., vol. 48, No. 2, pp. 681-685, Feb. 1977
"3-Dimensional Illustration By Multiply Exposed Hologram", M. Suzuki, et al., SPIE, vol. 523 Applicatios of Holography (1985), pp. 38-4