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Optical reflector and surface light source device

一种光反射体、反射率的技术，应用在反射器、显示装置、照明装置等方向，能够解决面光源亮度不均等问题，达到维持画质的效果

Active Publication Date: 2006-06-21
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, if these white polyolefin films are installed as the light reflector of the surface light source device, unevenness in brightness may occur on the surface light source when the light source is turned on for a long time and used for a long time.

Method used

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  • Optical reflector and surface light source device
  • Optical reflector and surface light source device

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0068] Composition (B) mixed with PP1, HDPE and filler in the amount shown in Table 2, and compositions (A) and (C) mixed with PP2 and filler in the amount shown in Table 2 were extruded by 3 machines respectively The machine melts and kneads at 250°C. Then, these kneaded products are supplied to a co-extrusion die, and after the protective layers (A) and (C) are laminated on both surfaces of the base layer (B) in the die, they are extruded in sheet form, and cooled The rolls were cooled to about 60°C to obtain a laminate.

[0069] After reheating the laminate to 145°C, stretch it in the longitudinal direction at the magnification shown in Table 2 by using the difference in linear speed of a plurality of roll groups, and then reheat to 150°C, and stretch it in the width direction with a tenter. stretched at the ratios shown in Table 2. Next, after performing annealing at 160° C., it was cooled to 60° C. with a cooling roll, and the burrs were cut off to obtain a white polyol...

manufacture example 2

[0071] The composition (B) which mixed the PP1, HDPE, and filler in the quantity shown in Table 2 was melt-kneaded at 250 degreeC with the extruder. Then, it extruded in sheet form, and cooled to about 60 degreeC with the cooling roll, and obtained the base material layer (B). After reheating this base material layer (B) to 145 degreeC, it stretched by the ratio shown in Table 2 in the longitudinal direction by utilizing the linear velocity difference of several roll groups.

[0072]Compositions (A) and (C) in which PP2 and fillers were mixed in the amounts shown in Table 2 were melt-kneaded, melt-extruded on both sides of the obtained substrate layer (B), and the protective layer (A) was laminated. , (C). Next, this laminate was heated again to 160° C., and stretched at the magnification shown in Table 2 in the width direction by a tenter. Then, after performing annealing at 160° C., it was cooled to 60° C., and the burrs were cut off to obtain a white polyolefin film havin...

manufacture example 3

[0074] The composition (B) in which PP1 and filler were mixed in the amount shown in Table 2, and the compositions (A) and (C) in which PP2 and filler were mixed in the amount shown in Table 2 were respectively extruded with three extruders. Melting and kneading at 250°C. Then, these kneaded products are supplied to a co-extrusion die, and after the protective layers (A) and (C) are laminated on both surfaces of the base layer (B) in the die, they are extruded in sheet form, and cooled The rolls were cooled to about 60°C to obtain a laminate.

[0075] After reheating the laminate to 145°C, stretch it in the longitudinal direction at the magnification shown in Table 2 by using the difference in linear speed of a plurality of roll groups, and then reheat to 150°C, and stretch it in the width direction with a tenter. stretched at the ratios shown in Table 2. Next, after performing annealing at 160° C., it was cooled to 60° C., and the burrs were cut off to obtain a white polyol...

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Abstract

Provided is a light reflector formed of a white polyolefin film; the white polyolefin film contains a polyolefin resin and a filler, is stretched at least along one axis, and has an area stretching ratio of 1.3 to 80 times, and The total light reflectance is greater than or equal to 95%, the size change rate after standing at 70°C for 300 hours is less than or equal to 1.5%, and the melting initiation temperature is greater than or equal to 70°C. If this light reflection body is attached to a surface light source device, even if this surface light source device is used for a long time, unevenness in brightness of a surface light source will not generate|occur|produce easily.

Description

technical field [0001] The invention relates to a light reflector and a surface light source device. Even if the surface light source device using the light reflector of the present invention is used for a long time with the light source turned on, the size change of the light reflector and uneven brightness of the surface light source do not occur. Background technique [0002] A backlight type liquid crystal display equipped with a built-in light source is widely used. Among the built-in light sources of the backlight type, the typical structure of the direct-lit backlight is as follows: figure 1 As shown, it is composed of an outer cover 10 that functions as a structure and a light reflector, a diffuser plate 14, and light sources 15 such as cold cathode lamps. The typical structure of edge-lit backlight is as follows: figure 2 As shown, it is formed of a light guide plate 13 on which a halftone dot printing 12 is applied to a transparent acrylic plate, a light reflec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/08F21V7/22F21V8/00G02B27/00G02F1/1335G02F1/13357
CPCG02B1/105G02B5/0808G02B5/0841G02B6/0043G02B6/0055G02F1/133615G02F2201/34G09F13/14G09F13/18G02B1/14
Inventor 上田隆彦小山广高桥友嗣
Owner MITSUBISHI CHEM CORP
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