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Light reflector and surface light source device using same

A light reflector and reflectivity technology, applied in the direction of electric light sources, reflectors, lighting devices, etc., can solve the problems of low rigidity, achieve high brightness, improve brightness unevenness, and excellent dimensional stability

Inactive Publication Date: 2015-11-25
YUPO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the other hand, the rigidity is also required to be low enough to be able to be wound up in a roll when supplying the light reflector, and to return to a flat surface during use.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0111] Hereinafter, the present invention will be described more concretely using production examples, examples, comparative examples, and test examples. The materials, usage amounts, ratios, operations and the like shown below can be appropriately changed without departing from the gist of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below. In addition, the summary of the paper material used in the Example of this invention and a comparative example is shown in Table 1.

[0112] [Table 1]

[0113]

manufacture example 1～4

[0116] Using an extruder set at 250° C., a composition for a support layer (a) in which materials described in Table 2 were mixed at a compounding ratio described in Table 3 was melt-kneaded. Thereafter, this was extruded into a sheet and cooled to about 60° C. with a cooling roll to obtain a support layer (a). This support layer (a) was reheated to 145 degreeC, and it stretched in the longitudinal direction at the magnification shown in Table 3 using the peripheral speed difference of several roll groups. Next, using an extruder set at 250°C, the composition for the surface layer (b) in which the materials described in Table 2 were mixed at the compounding ratio described in Table 3 was melt-kneaded, and the composition obtained above was melt-extruded. Both surfaces of the support layer (a) are laminated so as to form a surface layer (b) / support layer (a) / surface layer (b) to obtain a laminate. Next, this laminate was reheated to 160° C., and stretched in the transverse dir...

manufacture example 5

[0118] The composition for the support layer (a) in which the materials described in Table 2 were mixed at the compounding ratio described in Table 3 and the compounding ratio described in Table 3 were mixed using three extruders set at 250° C. The composition for the surface layer (b) of the material described in Table 2 was melt-kneaded. Next, these compositions are laminated in the form of surface layer (b) / support layer (a) / surface layer (b) in a multi-layer mold, extruded into a sheet, and cooled to about 60°C with a cooling roll. °C to obtain laminates. This laminate was reheated to 145° C., and stretched in the longitudinal direction at the magnification described in Table 3 by utilizing the peripheral speed difference of a plurality of roll groups. Next, this laminate was reheated to 160° C., and stretched in the transverse direction at the ratios described in Table 3 by a tenter. Thereafter, after annealing at 160° C., it was cooled to 60° C., and the edges were cut...

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Abstract

Provided is a light reflecting body wherein a reflecting layer formed of a polyolefin resin film is disposed on at least one face of a substrate layer formed of a paper material. The light reflecting body has a reflectivity in the reflecting layer surface of 95-105%, a taber stiffness of 0.4-100mN·m, and a dimension change rate of -0.3 - 0.3% in ambient temperature changes of 20 degrees C - 70 degrees C. The light reflecting body is resistant to bending, may be rolled into rolls, and has superior dimensional stability even when used as an internally mounted light source member.

Description

technical field [0001] The present invention relates to a reflector used in a surface light source device, a light reflector useful as a member for light reflection used in various lighting devices, and a surface light source device using the light reflector. Background technique [0002] Backlit liquid crystal displays, liquid crystal televisions, and illuminated signs, in which the light source is arranged inside and emits light from the rear to improve visibility, are widely used. Among the backlight built-in light sources, the typical structure of the edge-lit method is as follows: figure 1 As shown, a light reflector 11 , a light guide plate 14 on which halftone printing 13 is performed on a transparent acrylic plate 12 , a diffuser plate 15 , and a light source 16 are used. The light emitted by the light source is propagated by the light guide plate, reflected by the light reflector, and formed into uniform surface light by the diffuser plate. In recent years, along ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/08B32B27/00B32B27/10B32B27/32F21S2/00F21V7/22
CPCB32B27/10B32B27/32B32B2307/416B32B2307/536B32B2307/734B32B2457/20B32B2590/00G02B5/0808G02F1/133553
Inventor 上田隆彦广井洋介高桥友嗣
Owner YUPO CORP
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