Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
1997-08-25
2001-09-04
Chang, Audrey (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S009000, C359S565000, C359S575000, C430S001000, C430S002000, C430S004000, C430S005000
Reexamination Certificate
active
06285503
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method for the preparation of holographic diffusers and the holographic diffuser so prepared, especially to computer-generated design for holographic diffusers. The holographic diffuser of the invention provides high transmission rate and uniformed color-mixing effects.
BACKGROUND OF THE INVENTION
The holographic diffuser is an important element in the optical field. The holographic diffuser can not only improve the uniformity of the light projecting to an object but also widen the visibility of images. The applications of the holographic diffuser include: to function as background light source for planar display, as projection screen etc.
The conventional preparations of the holographic diffuser may be divided into two classes, as follows:
Planar diffusers: In this class, the ground glass is a good example. This kind of diffuser provides the scattering effect through the roughness of the surface of the diffuser. Due to the low transparent efficient of the diffuser, great attenuation of light passing through the diffuser is noted.
Holographic diffusers: In this glass, the shaping and diffusion of the light is provided through the interference of two light beams. Although the diffusion rate can be controlled and the light utilization efficiency of the diffuser may be enhanced, the energy after the diffuser is still reduced. As a result, unsatisfactory color mixing effects are noted.
It is thus a need in the industry to provide a method for the preparation of holographic diffusers that can enhance the transmission rate of the light beams and the color mixing effects through fine control of the structure of the diffusers. It is also a need in the industry to provide a method for the preparation of holographic diffusers so that holographic diffusers with high quality can be automatically designed and manufactured.
OBJECTIVES OF THE INVENTION
The purpose of this invention is to provide a novel method for the preparation of holographic diffusers with higher transparent rate and enhanced color mixing effects.
Another purpose of this invention is to provide a method for the preparation of holographic diffusers so that holographic diffusers with high quality can be automatically designed and manufactured.
Another purpose of this invention is to provide a method to design the structure of holographic diffusers with a computer.
Another purpose of this invention is to provide a novel structure of holographic diffusers.
Another purpose of this invention is to provide a holographic diffuser with higher light utilization efficiency and enhanced color mixing effects.
SUMMARY OF THE INVENTION
According to the present invention, a method for the preparation of holographic diffusers is disclosed. The holographic diffuser is designed through iterative calculations according to the Fraunhofer theory of diffraction and some constrain conditions. In the iterative calculation some constrain conditions that can change the magnitude of the light passing through the diffuser are used to design the diffuser. A novel iterative calculation is disclosed such that uniformed mixing of colors and high light utilization efficiency of the diffuser may be provided.
These and other objectives and advantages of this invention may be clearly understood from the detailed description by referring to the following drawings.
REFERENCES:
patent: 3619022 (1971-11-01), Hirsch et al.
patent: 5218471 (1993-06-01), Swanson et al.
Chao Wei-Chung
Kuo Chung-Jung
Wu Ching-Yi
Bacon & Thomas
Chang Audrey
Industrial Technology Research Institute
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