Optical: systems and elements – Holographic system or element – Having particular recording medium
Reexamination Certificate
2005-03-22
2005-03-22
Assaf, Fayez G. (Department: 2872)
Optical: systems and elements
Holographic system or element
Having particular recording medium
C359S001000, C359S009000, C359S029000
Reexamination Certificate
active
06870649
ABSTRACT:
The invention relates to a holographic viewing device that enables a bright reconstructed pattern to be viewed in place of light sources in a scene while a spot due to zero-order transmitted light is kept unnoticeable, and a computer-generated hologram for the same. The invention provides a holographic viewing device comprising a frame and a computer-generated hologram fitted in the frame. The computer-generated hologram is constructed as a transmission Fourier transform hologram. The computer-generated hologram comprises minuscule cells having pitches δxand δywith a reconstruction image area defined by a range of spreading of ± first-order diffracted light of given wavelength from a diffraction grating having grating pitches 2δxand 2δythat are twice as large as said pitches of cells, and an input image pattern35reconstructed at that wavelength is recorded in the computer-generated hologram in such a way that a light portion36of the input image pattern overlaps the center of the reconstruction image area.
REFERENCES:
patent: 5546198 (1996-08-01), van der Gracht et al.
patent: 6452699 (2002-09-01), Athale et al.
patent: 20040030732 (2004-02-01), Gerspach et al.
Assaf Fayez G.
Dai Nippon Printing Co. Ltd.
Sughrue & Mion, PLLC
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