Hologram screen and a method of producing the same
First Claim
1. A hologram screen for reproducing an image based on an output light obtained by scattering and diffusing and image light from an image projector, characterized in that;
- said hologram screen present an optical spectrum whose bandwidth is 100 nm or more; and
said hologram screen is comprised of a hologram element which is made by forming an interference fringe on a photosensitive material, said interference fringe being formed by irradiating an object light and a reference light onto said light sensitive material, said object light being made of a light diffused by a light diffusion body having a large diffusion angle and said reference light being made of a non-diffused light, where said light diffusion angle of the light diffusion body is set to 9 degrees or more such that the half bandwidth of said optical spectrum of the hologram screen is 100 nm or more.
1 Assignment
0 Petitions
Accused Products
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,
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 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.
-
Citations
8 Claims
-
1. A hologram screen for reproducing an image based on an output light obtained by scattering and diffusing and image light from an image projector, characterized in that;
-
said hologram screen present an optical spectrum whose bandwidth is 100 nm or more; and
said hologram screen is comprised of a hologram element which is made by forming an interference fringe on a photosensitive material, said interference fringe being formed by irradiating an object light and a reference light onto said light sensitive material, said object light being made of a light diffused by a light diffusion body having a large diffusion angle and said reference light being made of a non-diffused light, where said light diffusion angle of the light diffusion body is set to 9 degrees or more such that the half bandwidth of said optical spectrum of the hologram screen is 100 nm or more. - View Dependent Claims (2, 3, 4, 5)
-
-
6. 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;
-
said hologram screen present an optical spectrum whose bandwidth is 100 nm or more; and
said hologram screen is comprised of a hologram element which is made by forming an interference fringe on a photosensitive material, said interference fringe being formed by irradiating object lights and reference lights onto said light sensitive material, said object lights being made of diffused lights which are obtained irradiating a plurality of lights incident onto a light diffusion body at different angles and said reference lights being made of non-diffused lights, where said light diffusion angle of the light diffusion body is set to 9 degrees or more such that the half bandwidth of said optical spectrum of the hologram screen is 100 nm or more. - View Dependent Claims (7, 8)
-
Specification