Light-diffusing element and method for manufacturing light-diffusing element

A manufacturing method and technology of light diffusion, applied in optical elements, diffusing elements, optics, etc., can solve the problems of curling, curing shrinkage, and productivity, etc., and achieve strong diffusivity, suppress back scattering, haze high value effect

Inactive Publication Date: 2015-12-16
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of manufacturing a thick light-diffusing element, there is a problem that during manufacture, the curing shrinkage of the material forming the light-diffusing element increases to cause curling, or the productivity deteriorates due to suppression of curling.

Method used

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  • Light-diffusing element and method for manufacturing light-diffusing element
  • Light-diffusing element and method for manufacturing light-diffusing element
  • Light-diffusing element and method for manufacturing light-diffusing element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] 15 parts of polymethyl methacrylate (PMMA) fine particles (manufactured by Sekisui Chemical Industry Co., Ltd., trade name "XX131AA", average particle diameter 2.5 μm, refractive index 1.49) as light diffusing fine particles, and organic solvent 30 parts of mixed solvents (weight ratio 50 / 50) of butyl acetate and MEK were mixed and stirred for 60 minutes to prepare a mixed liquid.

[0125]Then, to the obtained mixed solution, a resin for hard coating (manufactured by JSR Corporation, trade name "Opstar KZ6661" (containing MEK / MIBK)) 100 parts, 50% butyl acetate solution 11 of pentaerythritol triacrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name "Viscoat #300", refractive index 1.52, molecular weight 298) as a precursor of the resin component 0.5 parts, 0.5 parts of a photopolymerization initiator (manufactured by Ciba Specialty Chemical, trade name "Irgacure907"), and 0.5 parts of a leveling agent (manufactured by DIC Corporation, trade name...

Embodiment 2

[0129] A light-diffusing element was produced in the same manner as in Example 1 except that the compounding quantity of the polymethyl methacrylate (PMMA) fine particles as light-diffusing fine particles was 20 parts. The obtained light-diffusion element was subjected to the evaluation of said (2)-(7). The results are shown in Table 1.

Embodiment 3

[0131] A light-diffusing element was produced in the same manner as in Example 1 except that the compounding quantity of the polymethyl methacrylate (PMMA) fine particles as light-diffusing fine particles was 30 parts. The obtained light-diffusion element was subjected to the evaluation of said (2)-(7). The results are shown in Table 1.

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Abstract

The purpose of the present invention is to provide a light-diffusing element that has a high haze value, is strongly diffusing, and has a smooth surface, reducing backscatter. This light-diffusing element has the following: a matrix that contains a resin component and an ultrafine-particle component; and light-diffusing fine particles dispersed within said matrix. Some of the resin component osmoses into the light-diffusing fine particles, and the distance to which the resin component osmoses into the light-diffusing fine particles is at least 90% of the mean diameter of the light-diffusing fine particles in this light-diffusing element. The arithmetic-mean surface roughness (Ra) is less than or equal to 0.04 mum.

Description

technical field [0001] The invention relates to a light diffusion element and a manufacturing method of the light diffusion element. Background technique [0002] Light diffusing elements are widely used in lighting lampshades, screens of projection televisions, surface emitting devices such as liquid crystal display devices, and the like. In recent years, the utilization of light-diffusion elements for the improvement of display quality, such as a liquid crystal display device, and the improvement of a viewing angle characteristic, progresses. As a light-diffusing element, a light-diffusing element having a matrix including a resin component and an ultrafine particle component, and light-diffusing fine particles dispersed in the matrix has been proposed (for example, refer to Patent Document 1). In this light-diffusing element, the matrix and the light-diffusing fine particles have a difference in refractive index, and a concentration-modulated region of ultrafine particle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02
CPCG02B5/0242G02B5/0268G02B5/0278
Inventor 中村恒三武本博之
Owner NITTO DENKO CORP
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