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Light-diffusing laminated film

A technology of light diffusing films and laminates, applied in optics, optical components, layered products, etc., can solve the problems of improving the brightness of components that are not mentioned, and achieve high brightness, improve the homogeneity of brightness, and improve brightness. Effect

Inactive Publication Date: 2013-05-01
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The technologies disclosed in the above-mentioned Patent Documents 7 and 8 are all evaluated only by overlapping the above-mentioned components or the surface light source unit, and neither mentions the brightness improvement effect brought about by the lamination of the components.

Method used

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Examples

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Embodiment

[0285] Hereinafter, examples are given to describe the present invention more specifically, but the present invention is not limited by the following examples, and can also be appropriately modified and implemented within the scope of the gist of the present invention, and these are included in the technical scope of the present invention. In addition, the measurement and evaluation methods used in the Examples are as follows. In addition, in the examples, "parts" means "parts by mass" unless otherwise stated, and "%" means "mass%" unless otherwise stated.

[0286] 1. Total light transmittance

[0287] A device with an integrating sphere (ISR-3100; manufactured by Shimadzu Corporation) was installed in a self-recording spectrophotometer (UV-3150; manufactured by Shimadzu Corporation), and a wavelength of 300 to 800 nm was scanned at high speed with a slit width of 12 nm. range, spectroscopic measurement is performed, expressed as the transmittance at 550nm.

[0288] In this ...

manufacture example 1

[0349] Using two melt extruders, 35 parts by mass of a cyclic polyolefin-based resin (TOPAS(TM) 6013S-04 manufactured by Topas Advanced Polymers, melt flow rate: 2.0 (230°C)) was mixed with the first extruder. A block copolymer resin formed of ethylene and octene (INFUSE(TM) D9817.15 manufactured by Dow Chemical Company, melt flow rate: 26 (230°C)) was used as a light diffusion layer in 65 parts by mass, and the second extrusion Machine, so that the polypropylene adhesive resin (Adomer(TM) SE800 manufactured by Mitsui Chemicals Co., Ltd., melt flow rate: 5.7 (190°C)) is used as the two surface layers, after melted and co-extruded with a T-die method , and cooled with a mirror-surface cooling roll to obtain an internal light-diffusing film having a total thickness of 400 μm and having heat-adhesive layers laminated on both surfaces. Adhesion between the film and the cooling roll during the above-mentioned cooling is performed using a vacuum chamber. The layer thickness composi...

manufacture example 2

[0352]Cyclic polyolefin-based resin (TOPAS (TM) 6015 manufactured by Topas Advanced Polymers, melt flow rate: 0.41 (230° C.)) 50 parts by mass and block copolymer resin composed of ethylene and octene (manufactured by Dow Chemical Co. Melt flow rate of INFUSE (TM) D9817.15: 26 (230°C)) 50 parts by mass, melt-mixed at a resin temperature of 250°C with an extruder PCM45 manufactured by Ikegai Iron Works Co., Ltd., and extruded with a T-die , cooled with a textured cooling roll (Ra=0.55) to obtain an internal light-diffusing film having a thickness of 400 μm. It should be noted that, as the surface opposite to the above-mentioned cooling roll, a squeeze roll whose surface was subjected to a release treatment (Ra=1.0) was used.

[0353] Table 1 shows the properties of the obtained inner light-diffusing film.

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Abstract

The present invention provides a light-diffusing laminated film having specific photo properties and constitutions of high brightness or illumination while used in surface source device, and the non-uniformity of the brightness or illumination may reduce. The characteristic of the photodiffusion film laminate is to be formed by laminating an inner photodisffusion film (A) which is satisfied with the following (i) to (iii) and a substrate (C) which its total light transmittance of the light with wavelength 550nm is 50 to 100%, and there is no air layer between the interfaces of these two: (i) total light transmittance of the light with wavelength 550nm is 48 to 84%; (ii) for the light with wavelength 550nm of the main diffusion direction, the ratio of the transmittance for its emergence angle 30 DEG (I30) to the transmittance for its emergence angle 0 DEG (I0) is 8.0 to 95%; (iii) the circumflexion of the light with wavelength 550nm is 4.0 to 100%.

Description

technical field [0001] The present invention relates to a light-diffusing film laminate, a surface light source device using the light-diffusing film laminate, and a display device or lighting device using the light-diffusing film laminate, when the light-diffusing film laminate is used in a surface light source device Brightness and illumination are high and can reduce brightness spots and illumination spots. Background technique [0002] Liquid crystal display modules (LCD) take advantage of features such as thinness, light weight, and low power consumption. Most of them are used as flat panel displays, and their applications are expanding year by year to information display devices such as mobile phones, portable information terminals (PDAs), personal computers, and televisions. . [0003] In order to suppress the loss in the light transmission path from the light source to the panel and improve the brightness on the panel, a surface light source device is provided on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02B32B7/02F21V3/00F21V3/04G02F1/13357
CPCG02B5/0278G02B5/0268G02F1/133606G02B5/02G02F1/1335
Inventor 久世胜朗河井兼次松田明
Owner TOYOBO CO LTD
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