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Light guide plate transfer molding method, light guide plate, and planar light source apparatus

A technology of light guide plate and transfer printing surface, applied in the direction of light source, electric light source, point light source, etc., can solve the problems of brightness drop, large leakage, uneven brightness, etc., and achieve the effect that the brightness is not easy to drop

Active Publication Date: 2015-02-04
TOHOKU DENSHI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, in the region between the light sources with weak light intensity, light is guided to the part where the density of the second pattern 19 is low, and the luminance decreases in this part.
As a result, there is a problem that brightness unevenness occurs on the light exit surface of the light guide plate 12.
[0009] On the contrary, when the light source 13 is arranged according to the second pattern 19 on the lower side of the light guide plate 12, the first pattern 18 on the upper side deviates from the optical axis of the light source 13, so the leakage of light from the inclined surface 17 becomes larger.

Method used

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  • Light guide plate transfer molding method, light guide plate, and planar light source apparatus
  • Light guide plate transfer molding method, light guide plate, and planar light source apparatus
  • Light guide plate transfer molding method, light guide plate, and planar light source apparatus

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Effect test

Embodiment approach 1

[0129] Hereinafter, only the part corresponding to one light source 32 ( Figure 4 or Figure 5 However, any of the surface light source devices described below are used as the surface light source devices 21 and 22 by arranging a plurality of light sources 32 .

[0130] Figure 7 (A) and Figure 7 (B) is a perspective view showing the top and bottom of the surface light source device 31 according to Embodiment 1 of the present invention. Figure 8 is a schematic cross-sectional view of the surface light source device 31 in a direction perpendicular to the light incident surface 38 . Figure 7 The diagram of the surface light source device 31 shown is only to show Figure 5 (A) and Figure 5 The part corresponding to one light source 32 in the surface light source device 22 shown in (B) ( Figure 4 or Figure 5 A distance between the boundary lines B) (a part of the original surface light source devices 21, 22).

[0131] The surface light source device 31 is composed o...

Embodiment approach 2

[0180] Figure 22 (A) and Figure 22 (B) is a perspective view from the top side and a perspective view from the bottom side showing the surface light source device 50 according to Embodiment 2 of the present invention. In this surface light source device 50 , the directivity conversion patterns 36 are radially provided on the inclined surface 37 . Regarding other configurations, since they are the same as in Embodiment 1, explanations will be omitted by attaching the same symbols to the same components as in Embodiment (the same applies to the following embodiments).

[0181] In this embodiment, when viewed from a direction perpendicular to the upper surface of the light guide plate 33, the direction of the directivity conversion pattern 36 is approximately parallel to the radiation direction of the light from the light source 32, so when a point light source is used, the direction of the light from the inclined surface is prevented. 37's light leak effect is further improv...

Embodiment approach 3

[0183] Figure 23 (A) and Figure 23 (B) is a perspective view from the top side and a perspective view from the bottom side showing the surface light source device 51 according to Embodiment 3 of the present invention. In the surface light source device 51 according to Embodiment 2, the protrusion 52 having a shape approximately half of the truncated cone shape protrudes from the upper surface of the light introduction portion 35 so as to overlap the inclined surface 37 . Such as Figure 24 As shown, the outer peripheral surface of the protrusion 52 becomes an inclined surface 53 inclined from the upper surface of the protrusion 52 to the light emitting surface 39 of the light guide plate main body 34, and a plurality of directivity conversion patterns 36 in a V-shaped groove structure are formed on the inclined surface 53. . When viewed from a direction perpendicular to the light exit surface 39, the directivity conversion pattern 36 becomes an arc-shaped band-shaped regi...

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Abstract

A light guide plate transfer molding method for performing transfer molding of a light guide plate using a first mold and a second mold, includes performing, on a resin material, transfer molding of a first pattern and a second pattern that are provided on a transfer face of the first mold. The first pattern changes with a specific interval P serving as one period. The second pattern changes with one or two or more periods that correspond to 1 / Na of the interval P. Na is a positive integer that satisfies Na≰m, m being a specific positive integer.

Description

technical field [0001] The invention relates to a transfer printing forming method of a light guide plate, a light guide plate and a surface light source device. Specifically, the present invention relates to a transfer molding method of a light guide plate, a structure of a molding die used in the transfer molding method, and a transfer molding device for a light guide plate. Also, the present invention relates to a light guide plate manufactured by a transfer molding method, a surface light source device, a liquid crystal display device, and a mobile device including the light guide plate. Background technique [0002] As a conventional transfer forming apparatus, there is known an apparatus that heats and presses a resin film with a transfer plate to transfer and form a fine concave-convex pattern (for example, refer to Patent Document 1). [0003] When manufacturing a light guide plate having periodic patterns on both upper and lower surfaces with such a transfer moldin...

Claims

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Application Information

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IPC IPC(8): B29C59/02G02B6/00F21V8/00F21S8/00F21Y101/02
CPCB29D11/00663B29L2011/0075B29C59/022G02B6/0036B29C59/04G02B6/0018G02B6/002G02B6/0038G02B6/0061G02B6/0065B29C59/02B29C2035/1666B29C2059/023
Inventor 仓田刚大
Owner TOHOKU DENSHI CO LTD
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