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Light reflector and surface light source device using the same

A light reflector and light reflection technology, applied in the direction of light source, reflector, slender light source, etc., can solve the problems of color change and yellowing of light reflector, and achieve high brightness, high reflectivity and excellent surface luminescence. Effect

Inactive Publication Date: 2007-12-05
YUPO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, due to the increase in the amount of light and the high temperature of the atmosphere due to the heat from the lamp, in the light reflector using the white polyester film, there is a problem that the color tone of the light reflector changes (yellow). Raw materials requiring less discoloration

Method used

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  • Light reflector and surface light source device using the same
  • Light reflector and surface light source device using the same
  • Light reflector and surface light source device using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and Embodiment 2

[0099] The materials described in Table 1 were mixed according to the compounding ratio shown in Table 2, and the obtained composition (A) was melt-kneaded at 250° C. with an extruder. Thereafter, it was extruded in a sheet form and cooled to about 60° C. with a cooling roll to obtain a base material layer (A). After heating this base material layer (A) again to 145 degreeC, it longitudinally stretched at the magnification shown in Table 2 using the peripheral speed difference of several roll groups.

[0100] The materials described in Table 1 were mixed according to the proportions shown in Table 2, the obtained compositions (B) and (C) were melt-kneaded, and the kneaded product was melt-extruded onto the obtained substrate On both surfaces of the layer (A), the light-diffusing layer (B) and the protective layer (C) are laminated in a B / C / A / C manner. Next, this laminate was heated again to 160° C., and stretched laterally at the magnification shown in Table 2 using a tenter....

Embodiment 3

[0102] The materials described in Table 1 were mixed according to the compounding ratio shown in Table 2, and the obtained composition (A) was melt-kneaded at 250° C. with an extruder. Thereafter, it was extruded in a sheet form and cooled to about 60° C. with a cooling roll to obtain a base material layer (A). After heating this base material layer (A) again to 145 degreeC, it longitudinally stretched at the magnification shown in Table 2 using the peripheral speed difference of several roll groups.

[0103] The materials described in Table 1 were mixed according to the proportions shown in Table 2, the obtained composition (C) was melt-kneaded, and the kneaded product was melt-extruded into the obtained substrate layer (A) Laminate the protective layer (C) in the manner of C / A / C on both sides. Next, this laminate was heated again to 160° C., and stretched laterally at the magnification shown in Table 2 using a tenter. Then, softening treatment was performed at 160° C. and ...

Embodiment 4

[0105]Using a molding roll with a depth of 58 μm and a pitch of 145 μm, which is an equilateral triangle in cross section, under the conditions of 100 kg of pressure, 80° C., and a linear speed of 3 m / min, the light-reflecting surface of the substrate obtained in Example 2 was Molding is carried out to obtain a laminated film having a light-gathering function on the surface. This laminated film was used as a light reflector.

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Abstract

A light reflector of which the bidirectional reflectance R1 is from 90 to 120% when the light entrance angle is 15° and the light acceptance angle is 0°, and the bidirectional reflectance R2 is from 85 to 110% when the light entrance angle is 75° and the light acceptance angle is 0°. The light reflector has high reflectivity, and attains brightness improvement even in underlight-type backlights.

Description

technical field [0001] The present invention relates to a light reflector and a surface light source device using the light reflector. The light reflector is useful as a reflector for a surface light source device, a reflector, and a light reflection member used in various lighting fixtures. The invention is especially suitable for direct-type surface light source devices. 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 type backlight is shown in Figure 2, which consists of a cover 11 that functions as a structure and light reflector, a diffuser plate 14, and light sources 15 such as cold cathode lamps or LEDs. The typical structure of an edge-lit backlight is shown in Figure 3, which consists of a light guide plate with dot printing 12 on a transparent acrylic plate 13, a light reflector 11, a diffuser plate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/08G02B5/02G02F1/13357G02F1/1335
CPCF21V7/22G02F1/133611G02B6/0065G02B5/0242G02B6/0055G02B5/0221G02F2201/34G02F1/133605G02B5/0268F21Y2103/00G02B5/0284G02B5/0278F21V7/24F21V7/28
Inventor 上田隆彦小山广
Owner YUPO CORP
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