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Light guide plate, and method for producing the same

A manufacturing method and technology of light guide plate, applied in the direction of light guide, optics, light source, etc., can solve the problems of inflexible elastic film forming pattern, ink or resin damage or peeling, etc., and achieve the effect of high reliability and durability

Inactive Publication Date: 2011-05-18
NIPPON MEKTRON LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to the risk of ink or resin being damaged or peeled off when the film-like base material is deformed
Therefore, it is difficult to form graphics on a flexible elastic film

Method used

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  • Light guide plate, and method for producing the same
  • Light guide plate, and method for producing the same
  • Light guide plate, and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0061] Next, a first example according to the present invention will be described. In this example, a thermosetting polyurethane film having a thickness of 200 μm was used as the base material 1 . For the printing ink, UV curable white ink A (main component: 70 to 90% by weight of the photopolymerizable composition; pigment: 10 to 20% by weight of titanium dioxide; and the remainder: 5% by weight or more less polymerization initiator). As the inkjet head 6, a piezoelectric type inkjet head was used under the conditions of 360 dpi and a small droplet volume of 14 pl. As a UV curing device, Subzero (manufactured by Integration Inc.) was used.

[0062]

[0063] In order to compare the bonding strength of UV-curable white ink A to base material 1 according to this example and the combination of each of the other base materials, the combination of base material and UV-curable white ink A was swollen degree test. The swelling degree test was performed by soaking a sample piece...

no. 2 example

[0075] In this example, a white ink different from that used in the first example was selected and tested in the same manner as in the first example. In this example as well, it was found that a combination of the white ink and a thermosetting polyurethane film serving as a base material could obtain sufficient bonding strength.

[0076] In this example, printing was performed using white ink under the following conditions. A thermosetting polyurethane film having a thickness of 200 μm was used as the base material 1 . As the white ink, UV-curable white ink B (main component: 65 to 75% by weight of acrylate; and pigment: 15 to 25% by weight of titanium dioxide) was used. The same inkjet head 6 and UV curing device 8 as in the first example were used.

[0077] For this base material and ink combination, the swelling degree test and the keystroke test were performed in the same manner as in the first example. The same results as in the first example were obtained.

[0078] I...

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Abstract

Provided is a thin and flexible light guide plate exhibiting high reliability and durability, wherein a resin film is used as the material of the light guide plate, a reflection pattern or a scattering pattern is formed on the back surface of the film by printing, and light propagating through the film exits the front surface thereof before being taken out. The base (1) of the light guide plate is formed of a thermosetting polyurethane sheet having a thickness of 0.4 mm or less. When a dot pattern is formed on the base by ink jet, white UV-curing ink, having such swellability that thermosetting polyurethane increases in weight by 10% or more after immersion for one hour at room temperature, is used as the white ink (2).

Description

technical field [0001] The present invention relates to a light guide plate for guiding light entering the light guide plate so that the light propagates therein and exits from a predetermined emission surface thereof, and a method of manufacturing the same. Background technique [0002] It is well known that recent portable devices such as mobile phones and mobile computers incorporate light guide plates for ten-key lighting, displays and various indicators. These portable devices are required to be thinner and more complex in shape. The light guide plate is also required to be flexible corresponding to portable devices that are manufactured to be thinner and more complicated in shape. [0003] As a conventional light guide plate, molded products of hard acrylic resin or polycarbonate are generally used. In addition, in order to make the light entering from the side surface of the light guide plate exit from the front surface of the plate, fine concave and convex patterns...

Claims

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Application Information

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IPC IPC(8): F21S2/00G02B6/00F21Y101/02
CPCG02B6/0043G02B6/0065G02B6/0041G02B6/0053G02B6/0038
Inventor 尾崎和行勝田康岩城隆高田隼人
Owner NIPPON MEKTRON LTD
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