Hologram screen and a method of producing the same

Details Hologram screen and a method of producing the same Hologram screen and a method of producing the same

2005-04-26

2005-04-26

Boutsikaris, Leo (Department: 2872)

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

C359S599000

Reexamination Certificate

active

06885483

ABSTRACT:
In a hologram screen for reproducing an image based on an output light obtained by scattering and diffusing an image light from an image projector, when a white light (image light) is projected on the hologram screen; and when a distance between two points at optional two points A and B on a surface of the hologram screen is given by 20 cm or less, and a value of the CIE 1976 chromaticity coordinate (u′, v′) at the point A is given by (u′A, v′A) and the value of the CIE 1976 chromaticity coordinate (u′, v′) at the point B is given by (u′B, v′B); the output light perpendicularly from the surface of the hologram screen has a color distribution in which a color difference Δu′v′between two points A and B is derived from the following formula (1) and given by 0.06 or less, where, the formula (1) is expressed by,in-line-formulae description="In-line Formulae" end="lead"?Δu′v′=[(u′A−u′B)2+(v′A−v′B)2]1/2  (1)in-line-formulae description="In-line Formulae" end="tail"?Further, the output light, which is output to a viewpoint defined by the following formula (2) from the surface of the hologram screen, has the color distribution in which a color difference Δu′v′ between two points A and B is derived from the above formula (1) and given by 0.01 or less, where, the formula (2) is expressed by,in-line-formulae description="In-line Formulae" end="lead"?H/2L=0.1  (2)in-line-formulae description="In-line Formulae" end="tail"?in the formula (2), L is a distance between the viewpoint and a center of the hologram screen, and H is a length of the hologram screen in the direction of the height.

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