Light diffusing agent, light diffusing sheet, and nonglare...

Details Light diffusing agent, light diffusing sheet, and nonglare... Light diffusing agent, light diffusing sheet, and nonglare...

2005-11-08

2005-11-08

Mahoney, Christopher (Department: 2851)

Optical: systems and elements

Projection screen

Embedded particles

C359S615000, C428S144000, C428S403000

Reexamination Certificate

active

06963447

ABSTRACT:
There are provided a light diffusing sheet and a nonglare sheet, which have good diffusion efficiency, can provide bright and high-contrast images and can reproduce high-quality images with reduced unnecessary scattered light and free from image haze and blur. The light diffusing sheet and the nonglare sheet comprise a light diffusing agent which, in use, is dispersed in a transparent base material. The light diffusing agent comprises core particles and a skin layer covering the surface of the core particles and satisfies requirements (i) and (ii):in-line-formulae description="In-line Formulae" end="lead"?N1<N2<N3 or N3<N2<N1  requirement (i)in-line-formulae description="In-line Formulae" end="tail"?wherein N1 represents the refractive index of the transparent base material, N2 represents the refractive index of the skin layer, and N3 represents the refractive index of the core particles; andrequirement (ii):T=R2+(2⁢n+14⁢ψ)2+24⁢(2⁢n+1)-Rwherein R represents the average radius of core particles in μm, T represents the thickness of the skin layer in μm, n is an integer of not less than 0 (zero), and ψ is 0.4 to 0.7 μm.

REFERENCES:
patent: 5023139 (1991-06-01), Birnboim et al.
patent: 6451408 (2002-09-01), Haunschild et al.
patent: 6695453 (2004-02-01), Hannington
patent: 6859314 (2005-02-01), Yoon et al.
patent: 2005/0042453 (2005-02-01), James et al.

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