JPH08194220A - Deformed type light transmission plate and its production - Google Patents

Abstract

PURPOSE: To make it possible to simplify the patterns of the irregular reflection parts formed on the reflection surface of a deformed type light transmission plate and to provide the deformed type light transmission plate with easy production at a low cost. CONSTITUTION: The parts, which correspond to both end sides at the incident eight side end of the reflection surface 3, of the deformed type light transmission plate 1 of metal molds for molding the deformed type light transmission plate 1 are previously provided with embossed surfaces and these embosses 13 are transferred to both end sides on the incident light side end of the reflection surface 3 of the deformed type light transmission plate 1 in the process for producing the deformed type light transmission plate 1 formed to reflect incident light with the reflection surface 3 and to irregularly reflect the light in the irregular reflection parts and to emit the light from a light emission surface 2 side. Both end sides of the incident light side end of the reflection surface 3 are provided with the embosses 13 formed at the time of molding the transmission plate and the reflection surface 3 is interspersed with the irregular reflection parts is simple patterns in the deformed type light transmission plate 1.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a liquid crystal backlight,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deformed light guide plate used for a signboard backlight for advertisements, lighting equipment, etc.

[0002]

2. Description of the Related Art One surface is a light emitting surface and the other surface is a reflecting surface, and diffuse reflecting portions are provided on the reflecting surface in a scattered manner so that incident light is reflected by the reflecting surface and diffusely reflected by the diffuse reflecting portion. In the light guide plate that makes the light emitting surface 12 emit light,
In order to reduce the weight, instead of the flat plate type, there is a deformed type such as a wedge type (for example, Japanese Patent Laid-Open No. 4-670).
6).

[0003]

However, in this type of irregular-shaped light guide plate, for example, in the vicinity of the light source, unevenness in light emission occurs such that the central side of the light source of the light guide plate becomes large and both end sides of the light source become small, or the light guide plate is formed. In order to mitigate the occurrence of uneven light emission such that the end of the light plate opposite to the light entrance part becomes dark, the light guide plate is made to have a different shape, such as printing on the reflection surface of the light guide plate. The pattern of diffuse reflection parts formed by the above becomes very complicated, and a lot of time and cost are spent for producing the pattern of diffuse reflection parts on the reflecting surface. In particular, the patterns of the irregular reflection portions at both ends of the light incident portion and the end portion on the side opposite to the light incident portion became complicated.

In view of the above problems, the present invention can simplify the pattern of the irregular reflection portion formed on the reflecting surface of the irregular-shaped light guide plate, and can provide the irregular-shaped light guide plate easily and at low cost. It is a thing.

[0005]

The first technical means of the present invention for solving this technical problem has a light emitting surface 2 on one side.
The other surface is defined as the reflection surface 3, and the irregular reflection portions 6 are provided on the reflection surface 3 in a scattered manner, and the incident light is reflected by the reflection surface 3 and diffusely reflected by the irregular reflection portion 6 to form the light emitting surface 2 side. In a method for manufacturing a modified light guide plate, the mold for molding the modified light guide plate 1 is provided at a portion corresponding to both ends of a light incident side end of the reflection surface 3 of the modified light guide plate 1. , Textured surface 1
6 is provided, and when the odd-shaped light guide plate 1 is molded,
It is a point that the grain 13 is transferred to both ends of the light incident side end of the reflection surface 3 of the odd-shaped light guide plate 1.

In the second technical means of the present invention, one surface serves as a light emitting surface 2 and the other surface serves as a reflecting surface 3, and irregular reflecting portions 6 are provided on the reflecting surface 3 in a scattered manner to reflect incident light. In a method of manufacturing a modified light guide plate, which is reflected by the surface 3 and diffusely reflected by the irregular reflection part 6 so that the light emitting surface 2 side emits light, the irregular shape guide of the mold 15 for molding the modified light guide plate 1 is performed. The uneven surface 16 is provided in the portion corresponding to both ends of the light incident side end of the reflecting surface 3 of the light plate 1 and in the portion corresponding to the end opposite to the light incident side. When the mold is molded, the wrinkles 13 are transferred to both ends of the light-incident side end of the reflecting surface 3 of the odd-shaped light guide plate 1 and to the end opposite to the light-incident side.

In the third technical means of the present invention, one surface serves as a light emitting surface 2 and the other surface serves as a reflecting surface 3, and irregular reflecting portions 6 are provided on the reflecting surface 3 in a scattered manner to reflect incident light. In a method of manufacturing a modified light guide plate, which is reflected by the surface 3 and diffusely reflected by the irregular reflection part 6 so that the light emitting surface 2 side emits light, the irregular shape guide of the mold 15 for molding the modified light guide plate 1 is performed. The textured surfaces 16 are provided at the portions corresponding to both ends of the light incident side end surface 9 of the light plate 1 so that the light incident side end surface 9 of the odd shape light guide plate 1 is formed when the irregular shape light guide plate 1 is molded. 1 on both ends
3 is the point to be transferred.

A fourth technical means of the present invention is that irregular reflection portions 6 are provided on the reflecting surface 3 of the irregular-shaped light guide plate 1 in a scattered manner after the irregular-shaped light guide plate 1 is molded. According to a fifth technical means of the present invention, one surface is a light emitting surface 2 and the other surface is a reflecting surface 3, and irregular reflecting portions 6 are provided on the reflecting surface 3 in a scattered manner so that incident light is reflected by the reflecting surface 3. In the irregular-shaped light guide plate which is reflected and diffusely reflected by the irregular reflection portion 6 so that the light emitting surface 2 side emits light, a grain 13 formed at the time of molding the light guide plate is formed at both ends of the light incident side end of the reflection surface 3. In addition, the irregular reflection portions 6 are provided on the reflecting surface 3 in a simple pattern in a scattered manner.

In a sixth technical means of the present invention, one surface serves as a light emitting surface 2 and the other surface serves as a reflecting surface 3, and irregular reflecting portions 6 are provided on the reflecting surface 3 in a scattered manner to reflect incident light. In the irregular-shaped light guide plate in which the light is reflected by the surface 3 and is diffusely reflected by the irregular reflection portion 6 so that the light emitting surface 2 side emits light, the reflection surface 3
On both ends of the light-incident side end and the end opposite to the light-incident side,
The texture 13 formed at the time of molding the light guide plate is provided,
The irregular reflection portions 6 are provided on the reflecting surface 3 in a simple pattern in a scattered manner.

In the seventh technical means of the present invention, one surface serves as a light emitting surface 2 and the other surface serves as a reflecting surface 3, irregularly reflecting portions 6 are provided on the reflecting surface 3 in a scattered manner, and light is incident from an end surface 9. In a modified type light guide plate in which light is reflected by the reflection surface 3 and diffusely reflected by the irregular reflection part 6 so that the light emitting surface 2 side emits light, it is formed at both ends of the light incident side end surface 9 at the time of molding the light guide plate. The texture 13 is provided, and the irregular reflection portion 6 is provided on the reflection surface 3.
Is a point that is provided in a dotted pattern with a simple pattern.

[0011]

In the vicinity of the light source 8 by the embosses 23 provided at both ends of the light-incident side end of the irregular-shaped light guide plate 1 on the reflection surface 3 side or both ends of the irregular-shaped light guide plate 1 at the light-incident side end face 9. It is possible to sufficiently mitigate the unevenness of issue in which the central side of the light source 8 of the odd-shaped light guide plate 11 becomes large and the both end sides of the light source 8 become small, and therefore, the reflective surface 3 of the odd-shaped light guide plate 1 is printed or the like. The pattern of the irregular reflection portion 6 to be formed may be a simple pattern that gradually increases from the side closer to the light source 8 to the side farther from it.
The unevenness of light emission such that the central side in the longitudinal direction becomes large and the both ends in the longitudinal direction of the light source 8 become small does not occur, and the light emitting surface 2 can be made uniform over the entire surface by the simple pattern of the irregular reflection portion 6.

Further, in the case where the embossing 23 is provided at the end of the irregular-shaped light guide plate 1 on the side opposite to the light incident side, the irregular-shaped light guide plate 1 has an end opposite to the light incident part. It is possible to sufficiently mitigate the unevenness of light emission that causes darkness.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIGS. 1 to 4, reference numeral 1 denotes a wedge-shaped modified light guide plate, which is made of a transparent material such as acrylic resin, polystyrene, polycarbonate, vinyl chloride, methacrylic resin. It is made of resin, and one surface of the odd-shaped light guide plate 1 is a light emitting surface 2 and the other surface is a reflecting surface 3. A light diffusion plate 4 made of, for example, a polycarbonate film is provided on the light emitting surface 2 side of the odd-shaped light guide plate 1. On the reflecting surface 3 of the light guide plate 1, a reflecting plate 5 made of, for example, a white film of polyethylene terephthalate is provided.

Reference numeral 8 denotes a light source composed of a lamp or the like, which is arranged outside one end surface 9 of the light guide plate 1, and the light of the light source 8 enters the inside of the irregular light guide plate 1 through the one end surface 9 of the irregular light guide plate 1. It is like this. Reference numeral 10 denotes a light-shielding cover, which is formed by sticking a silver vapor deposition film on the inner surface of a polyethylene film, for example, and covers the outer periphery of the light source 8 outside the end surface 9 of the odd-shaped light guide plate 1 so that the light of the light source 8 does not leak to the outside. There is. Reference numeral 11 denotes an edge cover, which covers the end surface of the odd-shaped light guide plate 1 on the side where the light source 8 is absent so that light does not leak to the outside.

Wrinkles 13 are formed at both ends of the light incident side end of the reflecting surface 3 and at the end opposite to the light incident side. The grain 13 is formed by transfer when the odd-shaped light guide plate 1 is molded as described later, and the grain 13 has a mirror surface roughness of 0.05-0.3 μmR of the irregular-shaped light guide plate 11.
The surface roughness is set to 1 to 5 μmRmax with respect to max. When the grain 23 becomes rougher than this, the grain 13 is formed on the light emitting surface 2.
This is because the part becomes conspicuous and uneven brightness occurs.

Further, irregular reflection portions 6 formed by dot-printing an ink mixed with a diffusing agent such as silica or titanium oxide are provided on the reflecting surface 3 of the irregular-shaped light guide plate 1 in a scattered manner. As shown in FIG. 4, the irregular reflection portion 6 is formed in a simple pattern so that the ratio to the reflection surface 3 gradually increases from the side closer to the light source 8 to the side farther from the light source 8. Next, a method for manufacturing the odd-shaped light guide plate 1 will be described. As shown in FIG. 3, the deformed light guide plate 1 of the pair of molds 15 for molding the deformed light guide plate 1.
The wrinkled surface 16 is provided in advance at the portion corresponding to both ends of the light incident side end of the reflection surface 3 and the portion corresponding to the end opposite to the light incident side of the reflection surface 3 and heated. The molten synthetic resin molding material is pressurized and flow-in and filled into the cavity 19 between the molds 15 through the liner to mold the odd-shaped light guide plate 1 (injection molding). At the time of molding of the odd-shaped light guide plate 1, as shown in FIG. 1, both end sides of the light-incident side end of the reflecting surface 3 of the odd-shaped light guide plate 1 and the light-incident side of the reflecting surface 3 are opposite to each other. The wrinkles 13 are transferred to the side end portions by the wrinkle surface 16. Then, after molding the odd-shaped light guide plate 1,
As shown in FIG. 3, the irregular reflection portions 6 are provided on the reflection surface 3 of the odd-shaped light guide plate 1 by dot-printing an ink mixed with a diffusing agent such as silica or titanium oxide. The irregular reflection portion 6 is formed in a simple pattern so that the ratio to the reflection surface 3 gradually increases from the side closer to the light source 8 to the side farther from the light source 8.

FIGS. 5 to 7 show another embodiment. As shown in FIG. 5, as shown in FIG. 7, wrinkles 13 are provided on both ends of the light incident side end surface 9 of the modified type light guide plate 1. In addition, irregular reflection portions 6 are provided in a dotted pattern in a simple pattern on the reflection surface 3 of the odd-shaped light guide plate 1. As shown in FIG. 6, the embossments 13 are formed in a portion of a pair of molds 15 for molding the irregular-shaped light guide plate 1 corresponding to both ends of the light incident side end surface 9 of the irregular-shaped light guide plate 1.
The textured surface 16 is provided in advance, and at the time of molding of the odd-shaped light guide plate 1, at both ends of the light incident side end surface 9 of the odd-shaped light guide plate 1,
It is a transcription of the grain 13. Then, after the odd-shaped light guide plate 1 is molded, as shown in FIG. 7, irregular reflection parts 6 are provided in a simple pattern on the reflection surface 3 of the odd-shaped light guide plate 1 by dot printing or the like. is there.

In the above-described embodiment, after the irregular-shaped light guide plate 1 is molded, the irregular reflection portion 6 formed by dot printing of ink is provided on the reflective surface 3 of the irregular-shaped light guide plate 1, but instead of this. The irregular reflection section 6 may be formed by forming fine irregularities on the reflection surface 3 of the odd-shaped light guide plate 1.
In this case, the irregular reflection section 6 may be formed on the reflecting surface 3 of the odd-shaped light guide plate 1 after molding of the odd-shaped light guide plate 1 as in the above-described embodiment, or the odd-shaped light guide plate 1 may be formed. A concave-convex surface for forming the irregular reflection portion 6 is provided in a portion of the mold 15 corresponding to the reflection surface 3 of the irregular-shaped light guide plate 1, and when the irregular-shaped light guide plate 1 is molded, the irregular-shaped guide is formed. The irregular reflection portion 6 may be formed on the reflection surface 3 of the light plate 1 together with the grain 13 by being transferred. In addition, the irregular reflection portion 6 formed by fine irregularities
The roughness is larger than that of the surface of the grain 13.

Further, in the above embodiment, the deformed light guide plate 1 has a wedge shape, but the deformed light guide plate 1 is not limited to this shape. For example, as shown in FIG. The shape may be such that the thickness gradually decreases from both end surfaces 9 toward the center. In this case, the light source 8 is arranged outside both end surfaces 9 of the odd-shaped light guide plate 1, and the wrinkles 13 are provided at both ends of the light-incident side end of the reflection surface 3 or at the light-incident side of the odd-shaped light guide plate 1. The irregular reflection portions 6 are provided on both ends of the end face 9 and the irregular-shaped light guide plate 1 is provided.
The reflective surface 3 may be formed in a simple pattern so that the ratio to the reflective surface 3 gradually increases from the both end surfaces 9 side closer to the light source 8 toward the central portion side farther from the light source 8.

[0020]

According to the present invention, for example, in the vicinity of the light source 8, the irregular-shaped light guide plate 1 has unevenness such that the central side of the light source 8 becomes large and the both ends of the light source 8 become small, and the irregular-shaped light guide plate. It is possible to obtain uniform light emission in which unevenness of light emission such that the end portion on the side opposite to the light incident portion 1 becomes dark is effectively mitigated by the grain 13. Moreover, the embossments 13 can be formed at the same time when the irregular-shaped light guide plate 1 is molded, and the irregular reflection portion 6 formed by printing or the like on the reflective surface 3 is formed even though the light guide plate 1 has an irregular shape. The pattern can be greatly simplified, and the odd-shaped light guide plate 1 can be easily manufactured and provided at a low cost.

[Brief description of drawings]

FIG. 1 is a perspective view of a deformed light guide plate before forming a diffuse reflection portion according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a light guide plate device using the same odd-shaped light guide plate.

FIG. 3 is a cross-sectional view showing a manufacturing process of the odd-shaped light guide plate.

FIG. 4 is a plan view of the odd-shaped light guide plate.

FIG. 5 is a perspective view of a deformed light guide plate before forming a diffuse reflection portion according to another embodiment.

FIG. 6 is a cross-sectional view showing a manufacturing process of the odd-shaped light guide plate.

FIG. 7 is a plan view of the odd-shaped light guide plate.

FIG. 8 is a cross-sectional view of a light guide plate device using a modified type light guide plate according to another embodiment.

[Explanation of symbols]

 2 Light emitting surface 3 Reflective surface 6 Diffuse reflection part 9 End surface 13 Texture 15 Mold 16 Texture surface

Claims (7)

[Claims] 1. One surface is a light emitting surface (2) and the other surface is a reflecting surface (3), and irregular reflecting portions (6) are provided on the reflecting surface (3) in a scattered manner to reflect incident light. In a method for manufacturing a modified light guide plate, the light is reflected by (3) and diffusely reflected by a diffuse reflection part (6) so that the light emitting surface (2) side emits light. The irregular light guide plate (1) is provided with a textured surface (16) at portions corresponding to both ends of the light-incident side end of the reflection surface (3) of the irregular light guide plate (1). A method of manufacturing a modified light guide plate, which comprises transferring a grain (13) to both ends of a light-incident side end of a reflection surface (3) of the modified light guide plate (1) during molding. 2. One surface is a light emitting surface (2) and the other surface is a reflecting surface (3), and irregular reflecting portions (6) are provided on the reflecting surface (3) in a scattered manner to reflect incident light. In a method for manufacturing a modified light guide plate, the light is reflected by (3) and diffusely reflected by a diffuse reflection part (6) so that the light emitting surface (2) side emits light. A part of the mold (15) corresponding to both ends of the light-incident side end of the reflection surface (3) of the odd-shaped light guide plate (1) and a part corresponding to the opposite end of the light-incident side. The irregular-shaped light guide plate (1) is provided with a textured surface (16).
When mold-molding, the grain (13) is transferred to both ends of the light-incident side end of the reflecting surface (3) of the irregular-shaped light guide plate (1) and to the end opposite to the light-incident side. A method for manufacturing a deformed light guide plate, comprising: 3. One surface is a light emitting surface (2) and the other surface is a reflecting surface (3), and irregular reflection portions (6) are provided on the reflecting surface (3) in a scattered manner to reflect incident light. In a method for manufacturing a modified light guide plate, the light is reflected by (3) and diffusely reflected by a diffuse reflection part (6) so that the light emitting surface (2) side emits light. The irregular-shaped light guide plate (1) is provided in a mold by forming a textured surface (16) on a portion of the mold (15) corresponding to both ends of the light-incident side end surface (9) of the irregular-shaped light guide plate (1). A method for manufacturing a modified light guide plate, characterized in that, at the time of molding, the wrinkles (13) are transferred to both ends of the light incident side end surface (9) of the modified light guide plate (1). 4. The irregular-shaped light guide plate (1) is provided with irregularly-reflecting portions (6) on the reflecting surface (3) of the irregular-shaped light guide plate (1) after the mold is formed. The method for manufacturing a modified light guide plate according to claim 1. 5. One surface is a light emitting surface (2) and the other surface is a reflecting surface (3), and irregular reflection portions (6) are provided on the reflecting surface (3) in a scattered manner to reflect incident light. In the modified light guide plate which is reflected by (3) and diffusely reflected by the irregular reflection part (6) so that the light emitting surface (2) side emits light, both ends of the light incident side end of the reflection surface (3) In addition to the textured parts (13) formed at the time of molding the light guide plate, the irregular reflection parts (6) are provided on the reflection surface (3) in a simple pattern in a scattered pattern. Light board. 6. One surface is a light emitting surface (2) and the other surface is a reflecting surface (3), and irregular reflecting portions (6) are provided on the reflecting surface (3) in a scattered manner to reflect incident light. In the modified light guide plate which is reflected by (3) and diffusely reflected by the irregular reflection part (6) so that the light emitting surface (2) side emits light, both ends of the light incident side end of the reflection surface (3) And the textured part (13) formed at the time of molding the light guide plate is provided at the end opposite to the light incident side, and the irregular reflection part (6) is formed in a dotted pattern on the reflection surface (3) in a simple pattern. A deformed light guide plate characterized by being provided. 7. One surface is a light emitting surface (2) and the other surface is a reflecting surface (3), and irregularly reflecting portions (6) are provided on the reflecting surface (3) in a scattered manner, and the light is incident from an end surface (9). Reflected light (3)
And the diffuse reflection part (6),
In a modified type light guide plate which is adapted to emit light from the light emitting surface (2) side, on both end sides of the light incident side end surface (9), a grain (13) formed at the time of forming the light guide plate is provided, and at the same time, a reflecting surface (3). In addition, the irregular-shaped light guide plate is characterized in that the irregular reflection portions (6) are provided in a dotted pattern in a simple pattern.