Hologram screen

G - Physics – 03 – B

Patent

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Details

G03B 21/60 (2006.01) G02B 5/32 (2006.01) G03H 1/18 (2006.01)

Patent

CA 2572998

A hologram screen exhibiting high diffraction efficiency and excellent durability through a refractive index modulation structure including a large refractive index variation (.DELTA.n). The hologram screen comprises a diamond- like carbon (DLC) film (22) having a refractive index modulation structure including a plurality of regions (n2) of relatively high refractive index and a plurality of regions (n1) of relatively low refractive index so that only the light projected from a projector to a screen is deflected toward a viewer and the light from an object in the rear of the screen is transmitted toward the viewer.

Cette invention a pour objet un écran hologramme offrant un rendement élevé de diffraction et une excellente durabilité grâce à une structure de modulation à indice de réfraction comprenant une grande variation de l~indice de réfraction (.DELTA.n). L~écran hologramme se compose d~un film (22) de carbone sous forme de diamant amorphe (DLC) disposant d~une structure de modulation à indice de réfraction comprenant une pluralité de régions (n2) à indice de réfraction relativement élevé et une pluralité de régions (n1) à indice de réfraction relativement bas de sorte que seule la lumière projetée par un projecteur sur un écran soit déviée vers une visionneuse et que la lumière provenant d~un objet à l~arrière de l~écran soit émise en direction de la visionneuse.

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