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OwnerDavid Brotherton-Ratcliffe, Florian Michel Robert Vergnes +2inventors
InventorsDavid Brotherton-Ratcliffe, Florian Michel Robert Vergnes, Alexey Rodin, Mikhail Grichine
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A single method and apparatus for producing many of the most common types of hologram from digital data is disclosed. In one embodiment the data are generated entirely by a computer as a 3-D (animated) model. In another embodiment the data are generated from multiple 2-D camera images taken of a real 3-D (moving) object or scene from a plurality of different camera positions. The data are digitally processed and displayed on a small high resolution spatial light modulator (SLM). A compact low energy pulsed laser, which avoids the usual vibration problems encountered at high rates of production and the installation in normal working environments, is used to record composite holograms on an holographic emulsion using a special optical design. The present invention permits the creation of restricted or full parallax master transmission or reflection type composite holograms, known as H1 holograms, that can be copied using traditional methods to produce full or single colour rainbow white-light transmission holograms, achromatic white-light transmission holograms or single or full-colour white-light reflection holograms. Alternatively the same invention and apparatus permits the direct writing of full or single colour rainbow white-light transmission composite holograms, achromatic white-light transmission composite holograms or single or full-colour white-light reflection composite holograms without the need to pass through the intermediate stage of the H1 transmission hologram. The present invention allows the creation of a compact rugged machine that is capable of producing holograms covering a large size range. In addition the invention produces holograms that can be tiled together to form composite holograms much larger than the component panels.
A holographic printer for writing master holograms (H1) for subsequent conversion to white-light viewable holograms (H2), comprising:
A holographic printer as claimed in any preceding claim, wherein said lens system (219) has an effective field of view (1103) greater than 70 degrees, preferably greater than 75 degrees, further preferably greater than 80 degrees, further preferably at best 85 degrees.
A holographic printer as claimed in any preceding claim, wherein the Fourier plane (266) of said lens system (219) is located downstream of said lens system, preferably at least 2 mm downstream of said lens system.
A holographic printer as claimed in any preceding claim, wherein said laser source is arranged to additionally produce laser beams at second and third wavelengths, said first, second and third wavelengths each differing from one another by at least 30 nm.
A holographic printer for writing master holograms (H1) for subsequent conversion to white-light viewable holograms (H2), comprising:
A method of writing master holograms (H1) for subsequent conversion to white-light viewable holograms (H2), comprising:
Dependencies are inferred from the claim text.