US 2002/0154348 A1 · Hologram screen and a method of producing the same

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, Δu′v′=[(u′A-u′B)2+(v′A-v′B)2]½ (1) 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, H/2L=0.1 (2) 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.

Claims29

Dependent claims

A hologram screen for reproducing an image based on an output light obtained by scattering and diffusing an image light from an image projector, characterized in that;

when a white light is used as the image light and 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, which is output 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,
Δu′v′=[(u′A-u′B)2+(v′A-v′B)2]½ (1)

1 more element

A hologram screen for reproducing an image based on an output light obtained by scattering and diffusing an image light from an image projector, characterized in that;

when a white light is used as the image light and 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, which is output to a viewpoint defined by the following formula (2) 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 0.01 or less, where, the formula (1) is expressed by,
Δu′v′=[(u′A-u′B)2+(v′A-v′B)2]½ (1)
and, where, the formula (2) is expressed by,
H/2L=0.1 (2)
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 at the direction of the height.

4 more elements

A hologram screen for reproducing an image based on an output light obtained by scattering and diffusing an image light from an image projector, characterized in that;

a peak wavelength of the hologram screen is either 525 nm or less, or 585 nm or more;
a half bandwidth of a spectral characteristic of the hologram screen is 100 nm or more;
a diffusion light which is obtained by a light diffusion body is used as an object light;
a non-diffusion light is used as a reference light;
the object light and the reference light are irradiated on a photosensitive material in order to form an interference fringe;
and a refractive index of the photosensitive material is adjusted so that a hologram element is produced.

3 more elements

A hologram screen for reproducing an image based on an output light obtained by scattering and diffusing an image light from an image projector, characterized in that;

when producing the hologram screen based on the conditions in which a half bandwidth of a spectral characteristic of the hologram screen is given by 100 nm or more, and a peak wavelength of the hologram screen is either 525 nm or less, or 585 nm or more;
any one or more of the following steps (A) to (H) is used when producing the hologram screen, i.e.,
(A) step of forming the interference fringe on a photosensitive material in such a way that a diffusion light which is obtained by a light diffusion body having a large diffusion angle is used as an object light, a non-diffusion light is used as a reference light, and the object light and the reference light are irradiated on the photosensitive material;
(B) step of forming the interference fringe on the photosensitive material in such a way that the diffusion light which is obtained by the light diffusion body is used as the object light, the non-diffusion light is used as the reference light, and the object light and the reference light are irradiated on the photosensitive material having a thickness of 1 to 20 μm;
(C) step of forming the interference fringe on the photosensitive material in such a way that the diffusion light which is obtained by the light diffusion body is used as the object light, the non-diffusion light is used as the reference light, an intensity ratio (R/O) of an intensity (O) of the object light and the intensity (R) of the reference light is given by 0.1 to 30;
and the object light and the reference light are irradiated on the photosensitive material;
(D) step of forming the interference fringe on the photosensitive material in such a way that the diffusion light which is obtained by the light diffusion body is used as the object light, the non-diffusion light is used as the reference light, an incident angle θr of the reference light to the photosensitive material is different from an incident angle θe of the image light to the hologram screen;
and the object light and the reference light each having the above different angle are irradiated on the photosensitive material in order to form the interference;
(E) step of forming the interference fringe on the photosensitive material in such a way that the diffusion light which is obtained by the light diffusion body is used as the object light, the non-diffusion light is used as the reference light, and a plurality of object lights each having different angle are irradiated on the photosensitive material in order to form the interference fringe thereon;
(F) step of forming the interference fringe on the photosensitive material in such a way that the diffusion light which is obtained by the light diffusion body is used as the object light, the non-diffusion light is used as the reference light, the object light and the reference light are irradiated on the photosensitive material in order to form the interference fringe, and a heat treatment is performed in the extent of 80° to 150° C.;
(G) step of forming the interference fringe on the photosensitive material in such a way that the diffusion light which is obtained by the light diffusion body is used as the object light, the non-diffusion light is used as the reference light, a sum of an exposure intensity of the exposure intensity of the object light and the exposure intensity of the reference light is given by the extent of 0.02 to 50 mW/cm2, and the object light and the reference light are irradiated on the photosensitive material in order to form the interference fringe;
and
(H) step of forming the interference fringe on the photosensitive material in such a way that the diffusion light which is obtained by the light diffusion body is used as the object light, the non-diffusion light is used as the reference light, the object light and the reference light are irradiated on the photosensitive material in order to form the interference fringe, and the thickness of the photosensitive material is adjusted.

10 more elements

Dependencies are inferred from the claim text.

Hologram screen and a method of producing the same

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Hologram screen and a method of producing the same

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Abstract

Claims29