JP2008159274A - Light guide plate, light guide plate molding die, method of manufacturing light guide plate molding die, and method of manufacturing light guide plate - Google Patents

Light guide plate, light guide plate molding die, method of manufacturing light guide plate molding die, and method of manufacturing light guide plate Download PDF

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Publication number
JP2008159274A
JP2008159274A JP2006343137A JP2006343137A JP2008159274A JP 2008159274 A JP2008159274 A JP 2008159274A JP 2006343137 A JP2006343137 A JP 2006343137A JP 2006343137 A JP2006343137 A JP 2006343137A JP 2008159274 A JP2008159274 A JP 2008159274A
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Prior art keywords
light
guide plate
surface
light guide
mold
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JP2006343137A
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Japanese (ja)
Inventor
Hiroshi Yokota
啓 横田
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Seiko Epson Corp
セイコーエプソン株式会社
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Application filed by Seiko Epson Corp, セイコーエプソン株式会社 filed Critical Seiko Epson Corp
Priority to JP2006343137A priority Critical patent/JP2008159274A/en
Priority claimed from US11/704,789 external-priority patent/US20070189039A1/en
Publication of JP2008159274A publication Critical patent/JP2008159274A/en
Application status is Withdrawn legal-status Critical

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Abstract

To stably improve light emission efficiency.
A light guide plate 110 according to the present invention is a light guide plate having a light emitting surface 110A for receiving light from a light source and emitting the light and a light reflecting surface 110B for reflecting the light. At least one of the light emitting surface 110A and the light reflecting surface 110B is formed in a concave or convex shape in the thickness direction of the light guide plate 110, and a plurality of first light diffusion portions 111 that diffuse the light, and the plurality And a second light diffusion portion 112 formed so as to have a uniform surface roughness over the entire surface between the first light diffusion portions.
[Selection] Figure 10

Description

  The present invention is used in an illumination device provided in various display devices such as a liquid crystal display device, and includes a light emitting surface on which light from a light source is incident from a side surface and emits the light, and a light reflecting surface that reflects the light. The present invention relates to a light guide plate, a light guide plate forming mold, a light guide plate forming mold manufacturing method, and a light guide plate manufacturing method, and in particular, a light guide plate capable of improving light emission efficiency from a light source, and a light guide plate forming metal mold. The present invention relates to a mold, a method for manufacturing a light guide plate mold, and a method for manufacturing a light guide plate.

  In recent years, various display devices such as liquid crystal display devices often used for televisions and personal computers are equipped with illumination devices such as so-called backlights in order to ensure the brightness of images actually displayed and to display them clearly. It has been. Such an illuminating device generally includes a light source that emits light and a light guide plate that guides the light emitted from the light source to the display device side.

  In such an illuminating device, the light emitted from the light source enters the inside of the light guide plate, for example, from the side and exits from the surface on the display device side (hereinafter referred to as “light emitting surface”). The light is repeatedly reflected on a surface opposite to the surface (hereinafter referred to as “light reflecting surface”) and finally emitted from the light emitting surface to the outside.

  Here, when the light emitting surface of the light guide plate is formed in a flat mirror shape over the entire area, most of the light from the light source is totally reflected at the boundary surface between the light emitting surface and the outside air, and thus the display device The irradiation efficiency with respect to (that is, the emission efficiency from the light guide plate) decreases. For this reason, in an illuminating device, usually, a number of fine irregularities are formed on the light emitting surface or light reflecting surface of the light guide plate, and the light path in the light guide plate is changed to improve the light emission efficiency. .

  In order to manufacture such a light guide plate, a mold for forming a light guide plate is usually used, and the following method is known as a manufacturing method for manufacturing this mold for forming a light guide plate. It has been. That is, for example, a method of manufacturing a light guide plate molding die for injection molding a light guide plate that emits light incident from a side surface from a light exit surface different from the side surface, and includes a first step to a third step. is doing.

Among them, in the first step, a plurality of depressions are formed by etching a processed surface to be a surface for forming a light emitting surface of the plate-shaped member as a material. In the second step, the processed surface is blasted to roughen the region including the inner surface of each recess in the processed surface. In the third step, the processed surface is polished to selectively mirror a part of the processed surface other than the inner surface of the recess. The light guide plate manufactured using the mold for forming the light guide plate manufactured as described above is configured to improve the light emission efficiency from the light output surface (for example, Patent Document 1). reference.).
JP 2004-216705 A

  However, in the light guide plate molding die manufactured by the conventional manufacturing method described in Patent Document 1, a part of the region other than the inner surface of the recess of the processed surface is mirror-finished. In the optical plate, there is a problem that a part of the light entering from the light source and going to the light exit surface is totally reflected by the mirrored portion, and it is difficult to improve the light exit efficiency more stably.

  The present invention has been made to solve the above problems, and can manufacture a light guide plate, a light guide plate molding die, and a light guide plate molding die capable of stably improving the light emission efficiency from the light source. It is an object to provide a method and a method for manufacturing a light guide plate.

  In order to solve the above-described problems, a light guide plate according to the present invention is a light guide plate having a light exit surface from which light from a light source enters from a side surface and emits the light and a light reflection surface that reflects the light. And at least one of the light emitting surface and the light reflecting surface is formed in a concave shape or a convex shape in the thickness direction of the light guide plate, and a plurality of first light diffusion portions for diffusing the light, and the plurality of the first light diffusion surfaces. A second light diffusing portion formed so as to have a uniform surface roughness across the entire surface between the one light diffusing portions.

  Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  At least the following matters will become clear from the description of the present specification and the accompanying drawings.

A light guide plate having a light exit surface from which light from a light source is incident and emits the light and a light reflection surface that reflects the light, and at least one of the light exit surface and the light reflection surface, The light guide plate is formed in a concave shape or a convex shape in the thickness direction, and has a uniform surface roughness over the entire surface between the plurality of first light diffusion portions that diffuse the light and the plurality of first light diffusion portions. A light guide plate comprising the second light diffusing portion formed as described above becomes clear.
According to such a light guide plate, the light emission efficiency from the light source can be stably improved.

Moreover, it is preferable that the height of the convex first light diffusion portion is higher than the surface roughness of the second light diffusion portion. As a result, the first light diffusing portion does not have to be buried in the rough surface of the second diffusing portion, so that a predetermined amount of light can be emitted by the first light diffusing portion.

  The second light diffusing section preferably has a concave or convex streak in a direction perpendicular to the light guide direction. Thereby, the emission efficiency can be increased.

A mold for molding a light guide plate having a light exit surface from which light from a light source is incident and emits the light and a light reflection surface that reflects the light, the light exit surface and the light reflection In order to mold the light guide plate with the first light diffusing portion for diffusing the light on the surface for molding at least one of the surfaces, a plurality of first shapes formed in a concave shape or a convex shape in a direction orthogonal to the surface direction. In order to mold the second light diffusing portion between the light diffusing portion forming dots and the first light diffusing portion of the light guide plate, a uniform surface roughness is provided over the entire surface between the first light diffusing portion forming dots. The metal mold | die characterized by providing the 2nd light-diffusion part formation rough surface formed so that it may become becomes clear.
According to such a mold, a light guide plate that can stably improve the light emission efficiency from the light source can be molded.

  The depth of the concave first light diffusing portion forming dots is preferably deeper than the surface roughness of the second light diffusing portion forming rough surface. In the light guide plate molded with such a mold, the first light diffusing portion does not have to be buried in the rough surface of the second diffusing portion, so that a predetermined amount of light can be emitted by the first light diffusing portion.

  In addition, it is desirable that a concave or convex streak in a direction perpendicular to the light guide direction of the light guide plate is formed on the rough surface for forming the second light diffusion portion. In the light guide plate molded with such a mold, the emission efficiency can be increased.

  In addition, it is preferable that the rough surface for forming the second light diffusion portion is formed by a grinding process after the first light diffusion portion forming dots are formed by an etching process. Thereby, the metal mold | die which shape | molds a 2nd light-diffusion part between the 1st light-diffusion parts of a light-guide plate can be formed easily.

A method for manufacturing a mold for molding a light guide plate having a light emitting surface that emits light from a light source and a light reflecting surface that reflects the light, and diffuses the light. Forming a plurality of concave or convex first light diffusing portion forming dots in a direction orthogonal to the surface direction to form the first light diffusing portion on the light guide plate; and the first light diffusing of the light guide plate Forming a second light diffusing portion forming rough surface between the first light diffusing portion forming dots and forming a second light diffusing portion forming rough surface having a uniform surface roughness across the entire surface in order to mold the second light diffusing portion between the portions; The manufacturing method of the metal mold | die characterized by providing is clarified.
According to such a mold manufacturing method, it is possible to manufacture a mold capable of molding a light guide plate capable of stably improving the light emission efficiency from the light source.

  The depth of the concave first light diffusing portion forming dots is preferably deeper than the surface roughness of the second light diffusing portion forming rough surface. In the light guide plate molded with such a mold, the first light diffusing portion does not have to be buried in the rough surface of the second diffusing portion, so that a predetermined amount of light can be emitted by the first light diffusing portion.

  In addition, it is preferable that a step of forming a rough surface for forming the second light diffusion portion is performed by forming concave or convex streaks in a direction perpendicular to the light guide direction of the light guide plate. In the light guide plate molded with such a mold, the emission efficiency can be increased.

  In addition, it is preferable that a step of forming the second light diffusion portion forming rough surface is performed by a grinding treatment after a step of forming a plurality of the first light diffusion portion forming dots by an etching treatment. Thereby, the metal mold | die which shape | molds a 2nd light-diffusion part between the 1st light-diffusion parts of a light-guide plate can be formed easily.

  Moreover, it is desirable that the depth of cut in the grinding process is shallower than the depth of the first light diffusing portion forming dots. In the light guide plate molded with such a mold, the first light diffusing portion does not have to be buried in the rough surface of the second diffusing portion, so that a predetermined amount of light can be emitted by the first light diffusing portion.

  Further, it is desirable that a cutting depth when dressing a grindstone used for the grinding process is shallower than a depth of the first light diffusing portion forming dots. In the light guide plate molded with such a mold, the first light diffusing portion does not have to be buried in the rough surface of the second diffusing portion, so that a predetermined amount of light can be emitted by the first light diffusing portion.

A light guide plate having a light emitting surface that emits light from a light source and that emits the light and a light reflecting surface that reflects the light, wherein the first light diffusing unit that diffuses the light In order to form the light guide plate, a plurality of concave or convex first light diffusion portion forming dots are formed in a direction orthogonal to the surface direction, and a second light diffusion is provided between the first light diffusion portions of the light guide plate. Forming a mold by forming a second light diffusing portion forming rough surface having a uniform surface roughness across the entire surface between the first light diffusing portion forming dots to mold the portion; And a step of producing a light guide plate using a mold.
According to such a light guide plate manufacturing method, it is possible to manufacture a light guide plate that can stably improve the light emission efficiency from the light source.

(Embodiment)
=== Overall Configuration of Light Guide Plate Unit ===
FIG. 1 is an exploded perspective view showing an example of a configuration of a light guide plate unit using the light guide plate according to the present embodiment. FIG. 2 is a side view showing an example of the configuration of the light guide plate unit shown in FIG. As shown in FIGS. 1 and 2, the light guide plate unit 100 is configured in a rectangular plate shape, for example, and includes prism sheets 101 and 102, a diffusion sheet 103, a light guide plate 110, a reflection sheet 104, and a light source cover 105. , And a light source 106.

  The prism sheets 101 and 102 have a structure in which, for example, a prism made of an acrylic resin is disposed on a polyester film layer, and condenses light emitted from the light emitting surface 110A side of the light guide plate 110 in the emitting direction. Similar to the prism sheets 101 and 102, the diffusion sheet 103 condenses light emitted from the light exit surface 110A side of the light guide plate 110 in the exit direction.

  The reflection sheet 104 is disposed so as not to leak light incident on the light guide plate 110 from the light reflection surface 110 </ b> B side or the side surface side of the light guide plate 110. The light source cover 105 is disposed so as to cover the light source in order to efficiently transmit the light from the light source 106 from the side surface of the light guide plate 110. The light source 106 includes a fluorescent tube such as a cold cathode tube and a light emitting element such as an LED (Light Emitting Diode). In addition, each sheet | seat 101-104 and the light source cover 105 are comprised by various resin materials, such as an acrylic type and a polyethylene type, for example.

  The light guide plate 110 is made of, for example, a thermoplastic resin material such as polycarbonate (PC), polymethyl methacrylate (PMMA), or cyclic olefin copolymer (COC), or a transparent material such as glass, and has high light transmittance and low birefringence. It has. The light guide plate 110 is formed by a processing method such as injection molding or heat press, for example, and a light exit surface 110A that emits light incident on the light guide plate 110 from the light source 106 through the side surface and the light exit surface 110A. And a light reflecting surface 110B that reflects to the side.

  That is, in the light guide plate unit 100 configured in this way, light from the light source 106 repeats reflection in the light guide plate 110 and is emitted from the light exit surface 110A side, and a part of the light leaks from the light guide plate 110 by the reflection sheet 104. Thus, the light reflected from the light exit surface 110 </ b> A is emitted in the direction substantially perpendicular to the light reflection surface 110 </ b> B through the diffusion sheet 103 and the prism sheets 101 and 102.

=== Shape of Comparative Light Guide Plate ===
<First comparative example>
FIG. 3 is an explanatory diagram of the shape of the light guide plate in the first comparative example. In the first comparative example, the light emission surface and the light reflection surface of the light guide plate are mirror surfaces. The arrow in the light guide plate in the figure indicates the path of light from the light source.
In the shape of the light guide plate of the first comparative example, light repeats reflection according to Snell's law, and escapes to the side surface (anti-light source surface) on the anti-light source side. For this reason, in the shape of the light guide plate of the first comparative example, the emission efficiency of light emitted from the light emission surface is reduced.

<Second Comparative Example>
FIG. 4 is an explanatory diagram of the shape of the light guide plate in the second comparative example. In this second comparative example, circular convex diffusion dots protruding outward from the light reflecting surface are uniformly formed on the light reflecting surface side of the light guide plate with an equal size and interval. FIG. 5 is an explanatory diagram of the light path in the vicinity of the diffusing dots. The surface of the diffusing dot is a rough surface, and diffuses and reflects when the diffusing dot is irradiated with light. As a result, in the second comparative example, the light emission efficiency is improved as compared with the first comparative example.
FIG. 6 is an explanatory diagram of the luminance distribution of the second comparative example. In the second comparative example, the diffusing dots are uniformly formed on the light reflecting surface side of the light guide plate with an equal size and interval. For this reason, a lot of light reaches the diffusion dots close to the light source, and the brightness increases on the light exit surface close to the light source, but only a small amount of light reaches the diffusion dots far from the light source, and the light exits far from the light source. The luminance is low on the surface. That is, the brightness of the light exit surface is not uniform in the shape of the light guide plate of the second comparative example.

<Third comparative example>
FIG. 7 is an explanatory diagram of the shape of the light guide plate and the luminance distribution in the third comparative example. In the third comparative example, the size of the diffusing dots is reduced as the distance from the light source is increased, and the size of the diffusing dots is increased as the distance from the light source is increased. In this third comparative example, the light reaching the diffusion dots close to the light source is less than in the second comparative example, and the light reaching the diffusion dots far from the light source is larger than in the second comparative example, compared with the second comparative example. Thus, the brightness of the light exit surface becomes uniform.

  By the way, in this third comparative example, it is necessary to adjust the size and density of the diffusion dots in order to make the luminance of the light exit surface uniform. In this case, the design can be facilitated by adjusting the size of the diffusion dots while keeping the number of diffusion dots per unit area constant. Therefore, in the pattern design of the diffusion dots, the area ratio between the area of the diffusion dots and the other area is controlled.

  On the other hand, the diffusion dots of the light guide plate are formed by a mold having a dot pattern formed by an etching process (described later). The reason why the dot pattern is formed on the mold by the etching process is that diffusion dots having different sizes can be processed at one time, and the etched surface has an appropriate rough surface and an appropriate rough surface. This is because it can be formed.

8A and 8B are explanatory diagrams of restrictions on the etching process. When the dot pattern is formed on the mold by etching, the inter-dot distance shown in FIG. 8A cannot be made smaller than 0.03 mm. If the distance between dots is smaller than 0.03 mm and the etching process is attempted, the diffusion dots are connected as shown in FIG. 8B, resulting in a different shape from the diffusion dots at the time of designing the dot pattern. And the area ratio of other areas cannot be controlled. For this reason, the inter-dot distance is 0.03 mm or more. (For this reason, the distance between dots is 0.03 mm or more in this embodiment described later.)
Note that the minimum dot diameter is also limited by the etching process, and the minimum dot diameter is 0.08 mm. If the dot diameter is smaller than 0.08 mm, the diffusion dots may not be formed on the mold. (For this reason, the minimum dot diameter is 0.08 mm in this embodiment described later.)
Due to the restrictions on the distance between dots, there is a limit to the size of the diffusing dots. As a result, in the light guide plate of the third comparative example, there is also light that attenuates without entering the diffusion dots. For this reason, there is room for improving the emission efficiency of the third comparative example. The light guide plate of the present embodiment described below is configured to increase the emission efficiency by using such light.

=== Shape of Light Guide Plate of this Embodiment ===
The light exit surface 110A of the light guide plate 110 is, for example, a flat surface or a rough surface roughened with a certain roughness, and the light reflecting surface 110B is, for example, a first light formed in a concave shape or a convex shape described later. A diffusion dot that is a diffusion part and a rough surface that is a second light diffusion part formed between the diffusion dots are provided.

  FIG. 9 is a front view of the light reflecting surface 110 </ b> B of the light guide plate 110. FIG. 10 is a cross-sectional view taken along the line AA in FIG. FIG. 11 is an enlarged view of a range indicated by M in FIG. As shown in FIGS. 9 and 10, the light reflecting surface 110 </ b> B of the light guide plate 110 includes a plurality of diffusion dots 111 and a rough surface 112 formed between the plurality of diffusion dots 111.

  Here, the plurality of diffusion dots 111 are formed in a circular convex shape protruding outward from the light reflecting surface 110B, and the diameters D1 and D2 of the diffusion dots 111 are, for example, about 0.1 mm to 0.5 mm, respectively. It is appropriately formed in the range. Here, each diffusion dot 111 is formed so that the diameter D1 of the diffusion dot 111 closer to the light source 106 <the diameter D2 of the diffusion dot 111 farther from the light source 106.

  Each diffusing dot 111 is formed so as to gradually protrude from the light reflection surface 110B in a range of about 0.02 mm to about 0.1 mm from the side closer to the light source 106 to the side farther from the light source 106. Further, the pitch P between the diffusion dots 111 is formed to be about 0.03 mm in the narrowest case. On the other hand, the rough surface 112 has a depth of about 0.01 mm from the light reflecting surface 110B and is formed over the entire surface of the light reflecting surface 110B with a uniform surface roughness.

  That is, the height of the diffusing dots 111 from the light reflecting surface 110 </ b> B is set higher than the surface roughness of the rough surface 112. Thus, the diffusing dots 111 are configured not to be buried in the rough surface 112. If the height of the diffusing dot 111 is lower than the surface roughness of the rough surface 112, the diffusing dot 111 is buried in the rough surface 112, and omnidirectional diffuse reflection by the diffusing dot 111 cannot be performed sufficiently.

  Here, the relationship between the diffusing dots 111 and the rough surface 112 on the light reflecting surface 110B of the light guide plate 110 formed in this way is diffused around a predetermined range M of the light reflecting surface 110B, for example, as shown in FIG. Assuming that the area of the dot 111 is S1 and the unit area within the predetermined range M is T1, the area ratio R for realizing the desired amount of emitted light can be derived from the relational expression S1 / T1 = R.

  FIG. 12 is a graph showing the relationship between the area ratio R and the distance L from the light source 106. As described above, the relationship between the area ratio R and the distance L needs to be adjusted so that the area ratio R increases as the distance L from the light source 106 increases as represented by the curve 600.

  By the way, as described above, the distance between dots cannot be made smaller than 0.03 mm due to the restriction of the etching process. For this reason, the maximum value of the area ratio R (= S1 / T1) is only about 0.7. In addition, the minimum dot diameter is 0.08 mm due to the restriction of the etching process. For this reason, the minimum value of the area ratio R is about 0.02. Therefore, when designing the dot pattern so that the luminance of the light exit surface is uniform, the area ratio R is adjusted between 0.02 and 0.7. In the present embodiment, in such a state where the area ratio R is restricted, rough surfaces are formed on the light emitting surface side and the light reflecting surface side in order to improve the emission efficiency.

FIG. 13 is an explanatory diagram of a rough surface on the light emitting surface side of the light guide plate 110.
Of the light from the light source, light that does not enter the diffusing dots and tends to attenuate is light that repeats reflection and travels in the light guide direction. For this reason, in this embodiment, the fine streak-like recessed part and convex part of the rough surface of the light-projection surface side and the light reflection surface side are formed so that a direction perpendicular | vertical to a light guide direction may be followed. In the drawing, for the sake of explanation, several streaks are drawn on the light emitting surface on the surface of the light guide plate 110, but in reality, innumerable fine streaks are formed.
In this way, by forming fine concave and convex portions on the rough surface in the direction perpendicular to the light guide direction, light that does not enter the diffusion dots 111 is diffused in the concave or convex portions on the rough surface, and the emission efficiency Will improve.

Such a rough surface is uniformly formed on the light emitting surface side. That is, fine concave portions and convex portions along the direction perpendicular to the light guide direction are uniformly formed on the light emitting surface side.
Such a rough surface is uniformly formed in the region between the diffusion dots 111 on the light reflection surface side. That is, fine concave portions and convex portions along the direction perpendicular to the light guide direction are uniformly formed in the region between the diffusion dots 111 on the light reflecting surface side. The surface of the diffusing dots is only formed with a rough surface by an etching process (described later), and a fine concave or convex part (a fine line along a direction perpendicular to the light guide direction) by a grinding process (described later). No recesses or protrusions are formed.

=== Production Method of Light Guide Plate Molding Mold ===
Next, a manufacturing process of a light guide plate forming mold for manufacturing the light guide plate 110 will be described.
FIG. 14A to FIG. 14E are process diagrams showing a manufacturing process of a light guide plate forming mold for manufacturing the light guide plate 110. In the following description, the same reference numerals are given to the same portions as those already described, and description thereof is omitted.

First, as shown in FIG. 14A, a light guide plate forming mold 700 of a plate-like member made of a metal base material is prepared and subjected to degreasing, washing, and the like. As the mold material, a general steel material for a normal molding mold can be used. Moreover, as the injection mold material, it is necessary to use a material excellent in corrosion resistance / abrasion resistance. In this embodiment, “Uddeholm STAVAX quenching material (hardness: about HRC 50 to 59)” is used.
Next, as shown in FIG. 14B, a resist 701 is formed on the processed surface of the light guide plate molding die 700 other than the diffusion dot 111 formation portion, and the diffusion dot formation region 702 and the rough surface formation region are formed. 703 is determined.

Next, as shown in FIG. 14 (c), the processed surface of the light guide plate molding die 700 is subjected to an etching process so that a diffusion dot transfer recess 711 having a fine rough surface in the diffusion dot formation region 702 is formed. Form.
Here, the conditions for the etching process are set so that the diffusion dot transfer depression 711 has a hemispherical shape with a diameter of 0.11 mm to 0.47 mm and a depth of 0.02 mm to 0.1 mm, for example.

As shown in FIG. 14D, the resist 701 is removed to expose the rough surface forming region 703.
Finally, as shown in FIG. 14 (e), for example, grinding is performed on the work surface using a grindstone 719 that rotates in the direction indicated by arrow E in the figure and moves in the direction indicated by arrow F in the figure. A rough surface transfer portion 712 is formed in the surface forming region 703 to form a light guide plate molding die 700 having a molding surface 710 having a diffusion dot transfer recess 711 and a rough surface transfer portion 712.

The conditions for grinding will be described.
As a grinding process condition, for example, a surface grinder is used, and a general grindstone, a diamond grindstone, a CBN grindstone, or the like can be selected as the grindstone 719. In this embodiment, a general grindstone (No. 60: abrasive grains are fused alumina / silicon carbide) is used as the grindstone.

  FIG. 15 is an explanatory diagram of the appearance of the dress. As shown in the figure, the grindstone 719 is processed by applying a dresser to the cylindrical grindstone 719 at an angle of 30 °. For the dresser, an acute angle (less than 90 °) grindstone (single crystal diamond) is used. When finely adjusting the roughness of the grindstone surface (or the roughness of the processed surface of the mold surface), a grindstone having an obtuse angle (90 ° or more) is used as the dresser. The tip of the dresser has a polygonal shape such as a pentagon, and the surface to be applied for each dress may be changed. In the present embodiment, the cutting depth during dressing is 0.01 mm.

  As the grinding conditions of the surface grinder, for example, the X-axis feed rate is preferably set to 20 m / min, the Y-axis feed rate is set to 4 mm per pitch, and the cutting depth is set to 0.01 mm. In addition, the processing surface of the mold surface is parallel to the X-axis direction and the Y-axis direction. The X axis direction is a direction orthogonal to the Y axis. The rotation axis of the grindstone 719 is parallel to the Y-axis direction. That is, at the contact point between the grindstone 719 and the processed surface, the surface of the grindstone 719 and the processed surface are relatively displaced in the X-axis direction. By this grinding process, streaky irregularities in the direction parallel to the X axis are formed in the rough surface transfer portion 712.

  By setting the conditions for the etching process and the grinding process in this way, the light guide plate molding die 700 having the rough surface transfer portion 712 having a surface roughness Ra of about 8 μm ± 1 μm, that is, a surface roughness Ra of 10 μm or less. Can be manufactured. In addition, it is also possible to change surface roughness Ra to about 6 micrometers-14 micrometers by changing the cutting depth of grinding.

  The surface roughness Ra is the “X-axis feed rate or Y-axis feed rate during grinding”, “the cutting depth during grinding”, “dressing conditions (positional relationship between the grinding wheel and dresser, cutting depth during dressing). It can be adjusted according to conditions such as “grinding speed)”, “grinding wheel count”, “material of work material”. In the present embodiment, since the rough surface transfer portion 712 is ground under the same conditions, the entire surface of the rough surface transfer portion 712 becomes uniform.

  By the way, if the blasting process is performed after the depression 711 is formed, the metal powder is sprayed on the surface of the depression 711 and the surface of the depression 711 is also blasted. On the other hand, in the present embodiment, the surface is ground after the concave recess 711 is formed by the etching process. For this reason, the grinding process can be performed on the rough surface forming region 703 (region other than the recess 711) without grinding the surface of the recess 711. That is, the rough surface forming region 703 can be ground while the rough surface by the etching process is maintained on the surface of the recess 711.

  In this embodiment, grinding is performed under uniform conditions regardless of the distance from the light source. For this reason, it is easy to make the surface roughness of the rough surface transfer portion 712 uniform, and the quality of the mold is also stabilized. If it is attempted to change the grinding conditions and surface roughness according to the distance from the light source, the grinding process becomes difficult and the quality of the mold is not stable.

  Further, in the present embodiment, as a result of grinding the rough surface forming region 703, the streaky irregularities formed in the rough surface transfer portion 712 are not regularly regular in both depth and pitch. For this reason, when the light guide plate is formed with such a mold (described later), it is possible to avoid uneven bright lines and to avoid occurrence of moire.

  Further, the surface of the grindstone 719 and the processing surface of the mold (rough surface forming region 703) are relatively displaced in the direction perpendicular to the light guide direction. As a result, the streak-like concave portions and convex portions formed in the rough surface transfer portion 712 contain a lot of components perpendicular to the light guide direction. Thereby, according to the light guide plate 110 formed of such a mold, the streak-like concave portion or convex portion along the direction perpendicular to the light guide direction is formed, so that the emission efficiency is improved. If the processing surface of the mold is subjected to a blasting process, since the unevenness that diffuses in all directions is only formed on the light guide plate, the emission efficiency is unlikely to increase.

  In this embodiment, the depth of the recess 711 formed during the etching process is 0.02 mm to 0.1 mm, which is set deeper than the surface roughness of the rough surface transfer portion 712. This is because if the surface roughness of the rough surface transfer portion 712 is larger than the depth of the recess 711, the recess 711 disappears, and the diffusion dots of the light guide plate cannot be formed according to the dot pattern design. If the light guide plate is manufactured with a mold in which the recess 711 has disappeared, the diffusion dots 111 are buried in the unevenness of the rough surface 112, and the diffusion dots 111 cannot perform the function as designed.

  In the present embodiment, the depth of cut (0.01 mm) during grinding of the surface grinder is set to be shallower than the depth of the recess 711. This is because if the depth of cutting during the grinding process is made deeper than the depth of the recess 711, the recess 711 disappears due to grinding, and the diffusion dots of the light guide plate cannot be formed according to the dot pattern design.

  Further, in the present embodiment, the cutting depth (0.01 mm) when dressing a grindstone used at the time of grinding by a surface grinder is set to be shallower than the depth of the recess 711. This is because if the grindstone is dressed deeper than the recess 711, the surface roughness of the rough surface transfer portion 712 after grinding becomes large enough to eliminate the recess 711.

  In the present embodiment, the recess 711 is formed in a circular shape during the etching process. For this reason, if the cutting depth at the time of grinding is less than half of the depth of the recess 711, the change in dot area before and after grinding can be small. For this reason, in this embodiment, the cutting depth (0.01 mm) at the time of grinding is set to about half of the depth (0.02 mm) of the shallowest recess 711. If the cutting depth at the time of grinding is increased, the area of the recess 711 changes greatly, and the diffusion dots of the light guide plate cannot be formed according to the dot pattern design.

=== Production Method of Light Guide Plate ===
Next, a process of manufacturing the light guide plate 110 using the light guide plate forming mold 700 manufactured as described above will be described.

  16 and 17 are explanatory views for explaining a manufacturing process of the light guide plate 110. FIG. 18 is a side view showing the manufactured light guide plate 110. 16 to 18, the shape of the molding surface 710 of the light guide plate molding die 700 is omitted. First, as shown in FIG. 16, an upper mold 801 on which an injection gate 801a is formed, side molds 802 and 803, and a light guide plate molding mold 700 are appropriately combined, and a plasticized state is formed from the injection cylinder 804. The resin material is injected and filled. And each metal mold | die 700,801-803 is cooled and the filled resin material is solidified.

  Next, as shown in FIG. 17, for example, the upper mold 801 is removed in the direction of the white arrow in the drawing, and the light guide plate 110 including the runner 110C is cut in the direction of the white arrow in the drawing. Then, the runner 110C is cut to manufacture the light guide plate 110 having the diffusion dots 111 and the rough surface 112 as shown in FIG.

  19A and 19B are explanatory diagrams of the shape of the diffusing dots 111. FIG. FIG. 19A is a photograph of diffusion dots. FIG. 19B is a graph showing the measurement results of height in 1A-1B of FIG. 19A. Since the diffusing dot transfer recess 711 of the mold has an appropriate rough surface by the etching process, an appropriate rough surface is also formed on the surface of the diffusion dot 111.

  The light guide plate 110 manufactured using the above-described light guide plate molding die 700 has the configuration of having the diffusing dots 111 and the rough surface 112 on the light reflecting surface 110B side. May be formed. Note that only the rough surface 112 may be formed on the light exit surface 110A side. In this case, specifically, for example, a rough surface may be formed on the processed surface of the upper mold 801 by grinding, and this may be transferred when the light guide plate 110 is formed.

  FIG. 20 is a side view showing another light guide plate. As described above, when a rough surface is formed and transferred on the processed surface of the upper mold 801, the rough surface 1112 is provided on the light emitting surface 1110A side, and the diffusing dots 1111 and the rough surface 1112 are provided on the light reflecting surface 1110B side. It is possible to obtain a light guide plate 1110 having The conditions for forming the diffusion dots 1111 and the rough surface 1112 are preferably set in the same manner as the light guide plate 110 described above. As described above, the light guide plates 110 and 1110 are provided with the diffusion dots 111 and 1111 having a fine rough surface and the rough surfaces 112 and 1112 formed between the diffusion dots 111 and 1111. For this reason, the occurrence of uneven brightness, which is a disadvantage of these, compared to the conventional method of improving the luminance by the rough surface and mirror surface formation, or the method of improving the luminance only by the dot arrangement mode, etc. Can be further suppressed by combining the diffusion dots 111 and 1111 and the rough surfaces 112 and 1112, while reliably suppressing the diffusion dots 111 and 1111 and the rough surfaces 112 and 1112.

  21 and 22 are graphs showing the relationship between the luminance B in a general light guide plate and the relative position L where the light source 106 is zero. FIG. 23 is a graph showing the relationship between the luminance B in the light guide plate 110 of the present embodiment and the relative position L where the light source 106 is zero. As shown in FIG. 21, when a general light guide plate is ground and a rough surface 112 is formed on at least one surface, the luminance B is increased as the relative position L from the light source 106 increases as shown by a curve 1200. Less. For this reason, the brightness B is not uniform.

  Therefore, as shown in FIG. 22, the diffused dots 111 are patterned on at least one side of a general light guide plate, and the luminance B increases as the relative position L from the light source 106 increases as shown by the curve 1300. If the diffusion dots 111 are formed and combined, the luminance B can be made uniform. Therefore, as shown in FIG. 23, in the case of the light guide plate 110 of the present embodiment, stable emission as indicated by the curve 1400 within the range from the luminance Min to the luminance Max regardless of the relative position L from the light source 106. The amount of light can be obtained. At this time, the ratio of luminance Min / luminance Max is preferably 80% or more.

  In the dot pattern design, when the dot diameter on the light source side is excessively large, the luminance per effective light emitting surface is improved, but the light reaching the non-light source side is reduced, so that the luminance uniformity is deteriorated. On the other hand, when the dot diameter on the light source side is set to the minimum and the dot diameter on the counter light source side is set to be small, the emission efficiency is lowered and the average brightness is lowered even if the uniformity of the brightness can be adjusted. Therefore, in the dot pattern design, first, the dot diameter on the side opposite to the light source is set as large as possible, and then the dot diameter on the light source side that increases the luminance uniformity and average luminance is obtained.

  FIG. 24 is a graph of luminance uniformity and average luminance of the light guide plate. The horizontal axis of the graph indicates the size of the diameter of the diffusion dot (minimum dot) on the light source side. Here, the dot diameter on the side opposite to the light source is 0.47 mm. The vertical axis on the right side of the graph indicates average luminance, and the vertical axis on the left side indicates luminance uniformity. The luminance uniformity is the size of the minimum luminance with respect to the maximum luminance. The solid line graph is an average luminance graph, and the alternate long and short dash line graph is a luminance uniformity graph. Here, in order to verify the average luminance and luminance uniformity by the dot pattern, rough surface formation by grinding processing is not performed.

As shown by the solid line graph, the average luminance increases as the dot diameter on the light source side increases. This is because as the dot diameter increases, the total amount of light reaching the diffusing dots increases and the emission efficiency increases. In addition, when the dot diameter on the light source side is 0.13 mm or less, the luminance uniformity increases as the dot diameter on the light source side increases. In addition, when the dot diameter on the light source side is 0.13 mm or less, it is considered that there is luminance unevenness that becomes brighter on the opposite light source side. On the other hand, when the dot diameter on the light source side exceeds about 0.13 mm, the luminance uniformity decreases as the dot diameter on the light source side increases. When the dot diameter on the light source side exceeds 0.13 mm, it is considered that there is luminance unevenness that makes the light source side bright.
In the present embodiment, the dot diameter on the light source side is set to 0.13 mm in order to increase the average luminance while maintaining the luminance uniformity.

  FIG. 25 is a table of experimental results of luminance uniformity and average luminance. Here, the maximum dot diameter (dot diameter on the opposite light source side) is 0.47 mm, the minimum dot diameter (dot diameter on the light source side) is 0.13 mm, and the surface roughness Ra of the rough surface 112 is changed. The average luminance increases as the surface roughness Ra increases. This is because the emission efficiency increases as the surface roughness Ra increases. On the other hand, the larger the surface roughness Ra, the brighter the light source side and the darker the non-light source side. This is because when the surface roughness Ra is increased, a lot of light is emitted on the light source side and the light reaching the non-light source side is reduced.

  According to the experiment by the applicant, the following results could be obtained. That is, a cold cathode tube of φ1.8 is used as the light source 106 of the light guide plate 110, the thickness of the light guide plate is unified to 2.15 mm, and only one of the diffusion dots 111 and the rough surface 112 is a light exit surface. The center luminance (average luminance) and luminance unevenness (luminance uniformity) of the light guide plate 110 were compared between the case where the light guide plate 110 is formed on the light reflecting surface 110B and the case where the light reflection surface 110B is formed in combination.

  As a result, in the former case, the central luminance was 3,780 cd / m 2 and the luminance unevenness was 81.5%, whereas in the latter case, the central luminance was 4,994 cd / m 2 and the luminance unevenness was 80.0%. % Result. Therefore, when the diffusing dots 111 and the rough surface 112 are combined in the light guide plate 110, the luminance unevenness is approximately the same as when only one of them is formed, but the luminance is about 1 .3 times improvement was able to be obtained. For this reason, according to the light guide plate 110 of the present invention, it can be said that the emission efficiency can be stably improved.

  As described above, according to the light guide plate 110 of the embodiment, a plurality of concave or convex diffusion dots that diffuse light on at least one of the light exit surface 110A and the light reflection surface 110B of the light guide plate 110. 111 and a rough surface 112 formed between the plurality of diffusion dots 111 so as to have substantially the same surface roughness over the entire surface. Accordingly, the light incident on the light guide plate 110 is diffused by the rough surface 112 formed between them together with the plurality of diffusion dots 111 and is emitted to the light emitting side, so that the conventional light having a rough surface and a mirror surface is provided. Compared with the light guide plate, the emission efficiency of light from the light source 106 can be stably improved as compared with the case where the emission efficiency is improved only by the arrangement or formation of dots or rough surfaces.

  In addition, since the concave or convex surfaces of the plurality of diffusion dots 111 are each roughened so as to have a plurality of fine irregularities formed by, for example, an etching process, light incident on the light guide plate 110 can be efficiently Can diffuse. Furthermore, since the density of the plurality of diffusion dots 111 increases per unit area from the side closer to the light source 106 to the side farther from the light source 106, the emitted light amount near the light source 106 and the emitted light amount far from the light source 106 can be made uniform. It is possible to suppress so-called luminance unevenness.

  Moreover, since the shape of the plurality of diffusion dots 111 has a circular shape (hemispherical shape) designed in the above numerical range, the emission efficiency of the diffusion dots 111 is made flexible while allowing the pattern design of the diffusion dots 111 on the light guide plate 110 to be flexible. Can be easily improved. Furthermore, since the surface roughness Ra of the rough surface 112 is formed to be approximately 10 μm or less, the rough surface 112 in the light guide plate 110 can be uniformly formed based on this surface roughness, It is possible to easily design the pattern of the diffusing dots 111 based on the surface roughness Ra of the rough surface 112 while improving the emission efficiency by the surface 112.

  In addition, according to the light guide plate molding die 700 of the embodiment, a plurality of concave or convex shapes that diffuse light on at least a processing surface to be a surface for molding the light reflecting surface 110B of the light guide plate 110. A diffusion dot transfer depression 711 and a rough surface transfer portion 712 formed between the diffusion dot transfer depressions 711 so as to have substantially the same surface roughness over the entire surface are formed. Thereby, the light incident on the light guide plate 110 formed by the light guide plate molding die 700 is formed by the rough surface transfer unit 712 together with the plurality of diffusion dots 111 formed by the plurality of diffusion dot transfer depressions 711. Since the light is diffused by the rough surface 112 and emitted to the light exit side, the light emission efficiency from the light source 106 can be stably compared with a conventional mold for forming a light guide plate having a rough surface and a mirror surface. It becomes possible to manufacture the light guide plate 110 that can be improved.

  Further, since the concave or convex surfaces of the plurality of diffusion dot transfer depressions 711 are each roughened so as to have a plurality of fine irregularities, the light is incident by the diffusion dots 111 of the light guide plate 110 formed thereby. The diffused light can be diffused efficiently. Further, the density of the plurality of diffusion dot transfer depressions 711 on the processing surface gradually increases from one end side to the other end side of the processing surface, and thus the light guide plate 110 formed thereby emits light near the light source 106. The amount of light and the amount of light emitted from the light source 106 can be made uniform, and so-called luminance unevenness can be suppressed.

  Moreover, since the shape of the plurality of diffusion dot transfer depressions 711 for forming the plurality of diffusion dots 111 of the light guide plate 110 has a circular shape (hemispherical shape) designed in the above numerical range, the light guide plate 110 formed thereby. In this case, it is possible to easily improve the emission efficiency by the diffusing dots 111. Furthermore, since the surface roughness Ra of the rough surface transfer part 712 for forming the rough surface 112 is formed to be approximately 10 μm or less, the rough surface 112 in the light guide plate 110 formed thereby has the surface roughness. It is possible to form uniformly based on this, and it is possible to easily design the pattern of the diffusing dots 111 based on the surface roughness Ra of the rough surface 112 while improving the emission efficiency by the rough surface 112.

  Further, according to the method of manufacturing light guide plate molding die 700 of the embodiment, at least the surface of the metal base material to be a surface for forming light reflecting surface 110B of light guide plate 110 is concave or etched by etching or casting. A plurality of convex diffusion dot transfer depressions 711 are formed, and a rough surface transfer portion 712 having substantially the same surface roughness is formed between the plurality of diffusion dot transfer depressions 711 by grinding or blasting. As a result, a light guide plate molding die 700 having a plurality of diffusion dot transfer depressions 711 and a rough surface transfer portion 712 formed on the surface can be obtained. It is possible to manufacture the light guide plate 110 that can stably improve the emission efficiency of the emitted light.

  Furthermore, according to the manufacturing method of the light guide plate 110 of the embodiment, the incident light by the injection molding using the light guide plate molding die 700 manufactured by the above-described manufacturing method of the light guide plate molding die 700. It is possible to obtain the light guide plate 110 that can stably improve the emission efficiency of the light.

  The above-described embodiments are for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

It is a disassembled perspective view which shows an example of a structure of a light-guide plate unit. It is a side view which shows an example of a structure of a light-guide plate unit. It is explanatory drawing of the shape of the light-guide plate in a 1st comparative example. It is explanatory drawing of the shape of the light-guide plate in a 2nd comparative example. It is explanatory drawing of the course of the light of a diffused dot vicinity. It is explanatory drawing of the distribution of the brightness | luminance of the 2nd comparative example. It is explanatory drawing of the shape of the light-guide plate in a 3rd comparative example, and luminance distribution. 8A and 8B are explanatory diagrams of restrictions on the etching process. It is a front view of the light reflection surface of a light-guide plate. It is AA sectional drawing of FIG. FIG. 10 is an enlarged view of a range indicated by M in FIG. 9. It is a graph which shows the relationship between the area ratio R and the distance L from the light source. It is explanatory drawing of the rough surface by the side of the light-projection surface of a light-guide plate. FIG. 14A to FIG. 14E are process diagrams showing a manufacturing process of a light guide plate molding die for manufacturing a light guide plate. It is explanatory drawing of the mode of a dress. It is explanatory drawing for demonstrating the manufacturing process of a light-guide plate. It is explanatory drawing for demonstrating the manufacturing process of a light-guide plate. It is a side view which shows the manufactured light-guide plate. 19A and 19B are explanatory diagrams of the shape of the diffusing dots 111. FIG. It is a side view which shows another light-guide plate. It is a graph which shows the relationship between the brightness | luminance in a general light-guide plate, and a relative position. It is a graph which shows the relationship between the brightness | luminance in a general light-guide plate, and a relative position. It is a graph which shows the relationship between the brightness | luminance and relative position in the light-guide plate of embodiment. It is a graph of the brightness | luminance uniformity and average brightness | luminance of a light-guide plate. It is a table | surface of the experimental result of brightness | luminance uniformity and average brightness | luminance.

Explanation of symbols

100 light guide plate unit, 101, 102 prism sheet,
103 diffuser sheet, 104 reflective sheet,
105 light source cover, 106 light source,
110, 1110 light guide plate,
110A, 1110A light exit surface,
110B, 1110B light reflecting surface,
111, 1111 diffusion dots,
112, 1112 rough surface,
700 Light guide plate mold

Claims (14)

  1. A light guide plate having a light exit surface from which light from a light source is incident and emits the light and a light reflection surface that reflects the light;
    At least one of the light emitting surface and the light reflecting surface is
    A plurality of first light diffusing portions that are formed in a concave or convex shape in the thickness direction of the light guide plate and diffuse the light; and
    A second light diffusing part formed between the plurality of first light diffusing parts so as to have a uniform surface roughness over the entire surface;
    A light guide plate comprising:
  2. The light guide plate according to claim 1,
    The height of the convex 1st light-diffusion part is higher than the said surface roughness of the said 2nd light-diffusion part, The light-guide plate characterized by the above-mentioned.
  3. The light guide plate according to claim 1 or 2,
    The light guide plate, wherein the second light diffusing unit has concave or convex stripes in a direction perpendicular to the light guide direction.
  4. A mold for molding a light guide plate having a light exit surface from which light from a light source is incident and emits the light and a light reflection surface that reflects the light,
    On the surface for molding at least one of the light emitting surface and the light reflecting surface,
    A plurality of first light diffusing portion forming dots formed in a concave shape or a convex shape in a direction perpendicular to the surface direction in order to mold the first light diffusing portion for diffusing the light into the light guide plate;
    In order to mold the second light diffusing part between the first light diffusing parts of the light guide plate, the first light diffusing part forming dots formed between the first light diffusing part forming dots to have a uniform surface roughness over the entire surface. A rough surface for forming two light diffusion portions;
    A mold characterized by comprising.
  5. The mold according to claim 4, wherein
    The depth of the concave first light diffusing portion forming dots is deeper than the surface roughness of the second light diffusing portion forming rough surface.
  6. The mold according to claim 4 or 5,
    A die having a concave or convex shape in a direction perpendicular to a light guide direction of the light guide plate is formed on the rough surface for forming the second light diffusion portion.
  7. A mold according to any one of claims 4 to 6,
    After the first light diffusion portion forming dots are formed by etching,
    The metal mold | die characterized by the said rough surface for 2nd light-diffusion part formation being formed by the grinding process.
  8. A method of manufacturing a mold for molding a light guide plate having a light exit surface from which light from a light source is incident and emits the light and a light reflection surface that reflects the light,
    A step of forming a plurality of concave or convex first light diffusing portion forming dots in a direction perpendicular to the surface direction in order to form the first light diffusing portion for diffusing the light on the light guide plate;
    In order to mold the second light diffusing portion between the first light diffusing portions of the light guide plate, the second light diffusing portion is formed with uniform surface roughness across the entire surface between the first light diffusing portion forming dots. Forming a rough surface for use;
    A method of manufacturing a mold, comprising:
  9. It is a manufacturing method of the metallic mold according to claim 8,
    The depth of the concave first light diffusing portion forming dots is deeper than the surface roughness of the second light diffusing portion forming rough surface.
  10. It is a manufacturing method of the metallic mold according to claim 8 or 9,
    A method of manufacturing a mold, wherein a step of forming a rough surface for forming a second light diffusing portion is performed by forming concave or convex streaks in a direction perpendicular to the light guide direction of the light guide plate. .
  11. It is a manufacturing method of the metallic mold according to any one of claims 8 to 10,
    The mold is characterized in that after the step of forming a plurality of the first light diffusing portion forming dots is performed by an etching process, the step of forming the second light diffusing portion forming rough surface is performed by a grinding process. Manufacturing method.
  12. It is a manufacturing method of the metallic mold according to claim 11,
    The method for manufacturing a metal mold according to claim 1, wherein a cutting depth in the grinding process is shallower than a depth of the first light diffusion portion forming dots.
  13. It is a manufacturing method of the metallic mold according to claim 11 or 12,
    A die manufacturing method, wherein a cutting depth when dressing a grindstone used for the grinding treatment is shallower than a depth of the first light diffusion portion forming dots.
  14. A method of manufacturing a light guide plate having a light exit surface from which light from a light source is incident from a side surface and emits the light and a light reflection surface that reflects the light,
    In order to form the first light diffusion portion for diffusing the light on the light guide plate, a plurality of concave or convex first light diffusion portion forming dots are formed in a direction orthogonal to the surface direction, and the light guide plate In order to mold the second light diffusing portion between the first light diffusing portions, a second light diffusing portion forming rough surface having a uniform surface roughness is formed between the first light diffusing portion forming dots over the entire surface. And manufacturing the mold,
    Producing a light guide plate using the mold;
    A method of manufacturing a light guide plate, comprising:
JP2006343137A 2006-12-20 2006-12-20 Light guide plate, light guide plate molding die, method of manufacturing light guide plate molding die, and method of manufacturing light guide plate Withdrawn JP2008159274A (en)

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US11/704,789 US20070189039A1 (en) 2006-02-10 2007-02-09 Light guide plate, mold for forming light guide plate, and method for manufacturing a mold for forming light guide plate

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JP2010177130A (en) * 2009-01-30 2010-08-12 Keiwa Inc Light guide sheet, and backlight unit using the same
JP2010244730A (en) * 2009-04-01 2010-10-28 Sony Corp Light guide plate, surface light-emitting apparatus, liquid crystal display apparatus, and method of manufacturing light guide plate
JP2011100701A (en) * 2009-11-03 2011-05-19 Kyoei Corporation Ltd Double-sided light emitting panel and display device
KR101040524B1 (en) 2009-01-30 2011-06-16 고려대학교 산학협력단 Manufacturing method for Light guide plate having a prism and hologram pattern
KR101040552B1 (en) 2008-11-06 2011-06-16 엘지전자 주식회사 Optical Film, Backlight Unit And Liquid Crystal Display Device Comprising The Same
JP2011175917A (en) * 2010-02-25 2011-09-08 Mitsubishi Rayon Co Ltd Surface light source device and light guide body to be used in the same
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JP2015536029A (en) * 2012-10-04 2015-12-17 ビ−エイイ− システムズ パブリック リミテッド カンパニ−BAE SYSTEMS plc Improved LCD backlight display
WO2019163630A1 (en) * 2018-02-21 2019-08-29 ナルックス株式会社 Method for producing mold
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JPH06342159A (en) * 1993-05-14 1994-12-13 Satoshi Inoue Surface light source body and production of surface light source body
JPH08136733A (en) * 1994-11-04 1996-05-31 Aasaa:Kk Back light panel
JPH10172321A (en) * 1996-12-11 1998-06-26 Copal Co Ltd Manufacture of light guide member and surface light emitting device using thereof
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KR101040552B1 (en) 2008-11-06 2011-06-16 엘지전자 주식회사 Optical Film, Backlight Unit And Liquid Crystal Display Device Comprising The Same
JP2010177130A (en) * 2009-01-30 2010-08-12 Keiwa Inc Light guide sheet, and backlight unit using the same
KR101040524B1 (en) 2009-01-30 2011-06-16 고려대학교 산학협력단 Manufacturing method for Light guide plate having a prism and hologram pattern
JP2010244730A (en) * 2009-04-01 2010-10-28 Sony Corp Light guide plate, surface light-emitting apparatus, liquid crystal display apparatus, and method of manufacturing light guide plate
JP2011100701A (en) * 2009-11-03 2011-05-19 Kyoei Corporation Ltd Double-sided light emitting panel and display device
JP2011175917A (en) * 2010-02-25 2011-09-08 Mitsubishi Rayon Co Ltd Surface light source device and light guide body to be used in the same
JP2012227062A (en) * 2011-04-21 2012-11-15 Toppan Printing Co Ltd Lighting unit and display device equipped with the same
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WO2019163630A1 (en) * 2018-02-21 2019-08-29 ナルックス株式会社 Method for producing mold

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