JP4268479B2 - Processing method and processing apparatus for light guide plate molding die - Google Patents

Description

  The present invention provides, for example, a method of processing a light guide plate molding die for processing a light guide plate molding die for resin molding of a light guide plate of a liquid crystal display device used in a personal computer, a mobile phone, a television, and the like, and the above-described mold The present invention relates to an improvement of a light guide plate forming mold processing apparatus for processing a mold.

Conventionally, for example, a light guide plate employing a sidelight (light source) has been used in the liquid crystal display device described above.
This side light type light guide plate is a light source disposed on the side surface side of the light guide plate, and light entering the light guide plate from the light source is, for example, in the light guide plate described above. The light is reflected by the planar reflecting portion and emitted from the light exiting portion of the light guide plate.
Further, in the above-described sidelight type light guide plate, when a convex portion having a required shape is formed on the reflection portion of the light guide plate, the light guide plate is reflected by the planar reflection portion of the light guide plate. Compared to the above, it has been found that the luminance is improved efficiently in optical design.
Therefore, for the purpose of efficiently improving the luminance of the light guide plate described above, for example, a configuration (so-called microlens array) in which, for example, a microlens (hemispherical convex portion) is provided on the reflection portion of the light guide plate described above. The light guide plate provided with the above-described microlens is resin-molded using a light guide plate forming mold processed by the LIGA method. By subjecting the exposed and developed resist film to dry etching on the surface-treated silicon base material, the surfaces of the resist film and the silicon base material (resist film non-formation portion) are eroded almost simultaneously, so that the microlens A master (silicon base material) having an array-shaped convex portion is formed, and finally, a nickel electroforming mold is formed on the master to form a light guide plate molding die (micro lens convex A split mold having a concave shape obtained by transferring the shape of the part).
Japanese Patent Application No. 2003-114466

However, as described above, the above-described LIGA method is a method of exposing and developing a silicon base material on which a resist film is formed, and includes a large number (multiple types) such as a resist film coating apparatus, an exposure apparatus, a developing apparatus, and a dry etching apparatus. ), For example, the light guide plate forming mold cannot be processed by one (one type) processing apparatus, and the light guide plate forming mold can be processed efficiently in a comprehensive manner. There is a harmful effect that it is not possible.
Therefore, a method for processing a light guide plate molding die capable of efficiently processing a light guide plate molding die for resin molding a light guide plate (light guide plate having a convex portion of a required shape) capable of improving luminance and There has been a long-awaited development of a processing apparatus used in the method.

  Therefore, the present invention can efficiently process a light guide plate molding die for resin molding of a light guide plate capable of improving luminance efficiently, and “light guide plate molding method” and “light guide plate” It is an object of the present invention to provide a “molding die processing apparatus”.

The processing method of the light guide plate molding die according to the present invention for solving the above technical problem is a processing tool corresponding to the shape of the convex portion having a required shape provided on the light guide plate with respect to the mold material. A light guide plate molding die processing method for forming a concave portion of a required shape corresponding to the shape of the convex portion having the required shape described above in the above-described mold material by pressing in a state of vibrating The above-described mold material is subjected to press processing in a state where a required plurality of the above-described processing tools and a fixed connection processing tool are vibrated.

In addition, the light guide plate molding die processing apparatus according to the present invention for solving the above technical problem is processed into a light guide plate molding die for resin molding of a light guide plate provided with a convex portion having a required shape. The mold material mounting means for mounting the mold material to be processed, the processing tool corresponding to the shape of the convex portion having the required shape described above, and the processing tool described above for the mold material mounted on the mounting means described above A light guide plate molding die processing apparatus having a pressing means for pressing in a vibrating state, wherein a plurality of the above-described processing tools are provided, and a fixed connection processing tool is provided. And

  Further, according to the present invention, a “light guide plate forming mold processing method” and “a light guide plate forming mold” that can efficiently process a light guide plate forming mold for resin-molding a light guide plate capable of improving luminance efficiently. There is an excellent effect that a light guide plate forming die processing apparatus can be provided.

That is, using the light guide plate forming mold processing apparatus (one type) according to the present invention, first, the mold material is mounted on the mold material mounting means of the above-described apparatus, and then the above-described mounting mold is mounted. A processing tool corresponding to the shape of the convex portion having the required shape provided on the light guide plate (for example, corresponding to the shape of the quadrangular pyramid-shaped convex portion) on the mold material (the surface) In the state where the processed tool is vibrated), the concave portion corresponding to the shape of the convex portion is formed in the above-described mold material by pressing.
Therefore, in the light guide plate molding die processing method according to the present invention, a light guide plate molding die having a concave portion corresponding to the shape of the processing tool corresponding to the shape of the convex portion having the required shape provided on the light guide plate. (Split type) can be formed.
Moreover, the light guide plate having a convex portion having a required shape can be resin-molded by using the above-described light guide plate molding die.
That is, as described above, the above-described mold material can be pressed (vibrated) in a state where the above-described processing tool is vibrated, so that the above-described mold material is formed. The inner surface (inner surface) of the recess having the required shape can be efficiently formed on the mirror surface, and the light guide plate molding die (divided die) can be processed.
Further, by molding the light guide plate with the above-described mold for forming the light guide plate, the shape of the concave portion having the mirror surface can be transferred and the convex portion having the mirror surface can be efficiently formed on the light guide plate. . For example, the side surface of the quadrangular pyramid-shaped convex portion can be efficiently formed as a mirror surface.
That is, as described above, a light guide plate having a convex portion of a required shape can be resin-molded using a light guide plate molding die processed by the processing apparatus according to the present invention. A light guide plate capable of improving luminance can be obtained.
Therefore, according to the present invention, the light guide plate molding die can be processed with one processing device as compared with the conventional LIGA method that requires a large number of processing devices. Can be processed efficiently.
Further, according to the present invention, a “light guide plate forming mold processing method” and “a light guide plate forming mold” that can efficiently process a light guide plate forming mold for resin-molding a light guide plate capable of improving luminance efficiently. There is an excellent effect that a light guide plate forming die processing apparatus can be provided.
Further, according to the present invention, a “light guide plate molding die” is formed by resin molding a light guide plate that is processed by the above-described “light guide plate molding die processing method and processing apparatus” and that can improve the luminance efficiently. It has an excellent effect that it can be provided.
Further, according to the present invention, the resin is molded by the “light guide plate molding die” processed by the “light guide plate molding die processing method and processing apparatus” and the luminance can be improved efficiently. It is possible to provide an excellent “light guide plate” that can be provided.

Hereinafter, Example 1 is demonstrated based on an Example figure.
1 and 2 show a processing apparatus used in a processing method for processing a light guide plate molding die for resin molding a light guide plate according to the present invention.
FIG. 3 (1) and FIG. 3 (2) are processing tools loaded in the above-described processing apparatus.
4 (1) and 4 (2) are light guide plate forming molds processed by the above-described processing apparatus.
FIGS. 5, 6 (1), and 6 (2) are light guide plates that are resin-molded with the above-described mold.
FIGS. 7A and 7B are pattern examples of convex portions in the reflection portion of the light guide plate.

That is, a required number of convex portions (including the shape and size), and a required number of irregularly arranged convex portions (referred to as irregular patterns) are formed on the reflecting portion (reflecting surface) of the light guide plate according to the present invention. ), And the convex portions having the required shapes described above are provided in different directions (different directions).
Generally speaking, the reflection portion of the light guide plate according to the present invention is configured such that a convex portion having a required shape is provided in an irregular pattern including a direction.
Further, in the example shown in FIG. 5, the required number (13 in the figure) of the different number of different quadrangular pyramid-shaped convex portions 3 is present on the reflecting portion 2 (reflecting surface) of the light guide plate 1 according to the present invention. In addition to being configured to be arranged in a regular manner, the orientation of the different types of quadrangular pyramid-shaped convex portions 3 described above is provided differently.

Here, the above-described quadrangular pyramid-shaped convex portion 3 will be described with reference to FIGS. 6 (1) and 6 (2).
That is, as shown in the figure, in the above-described quadrangular pyramid-shaped convex portion 3, reference numeral 4 is a bottom surface of a quadrangle (quadron), reference numeral 5 is a base, reference numeral 6 is a triangular side surface, and reference numeral 7 is a triangular shape. In the hypotenuse, symbol α denotes the apex angle that is the angle of the apex 11 formed by the two hypotenuses 7 of the triangular side surface 6, symbol H denotes the height of the quadrangular pyramid-shaped convex portion 3, and symbol L denotes the base 5. Shows the length.
Further, as shown in FIG. 5, the different types of quadrangular pyramid-shaped convex portions 3 described above have different shapes and different sizes.
Further, the types of the different types of the quadrangular pyramid-shaped convex portions 3 described above will be described in detail. For example, the height of the quadrangular pyramid-shaped convex portions 3 that are different from each other, Those having different lengths L, those having different apex angles α on the side surfaces of the triangles in the quadrangular pyramid-shaped convex portions 3 described above, and the shapes of the bottom surfaces 4 of the quadrangular pyramid-shaped convex portions 3 being square, rectangular, parallelogram, There are things such as unequal sides.
The size of the above-described quadrangular pyramid-shaped convex portion 3 can be roughly described as follows. For example, the height H is about 10 μm to about 35 μm, and the length L of the base 5 is about Some have a diameter of 5 μm to about 20 μm, and some have an apex angle α of about 100 degrees.

The direction of the quadrangular pyramid-shaped convex portion 3 is the state in which the bottom surface 4 (entire surface) of the quadrangular pyramid-shaped convex portion 3 slides on the reflective portion 2 (reflective surface) of the light guide plate 1 described above. For example, the external appearance of the quadrangular pyramid-shaped convex portion 3 as viewed from the side light (light source) side of the light guide plate 1 is different.
Needless to say, there may be a required number of the same kind of quadrangular pyramid-shaped convex portions 3 in the reflecting portion 2 of the light guide plate 1 described above, and the above-mentioned different types of quadrangular pyramidal convex portions 3 (for example, , Similar shapes) have the same orientation.
Accordingly, the above-described light guide plate is optically designed by disposing the required number of different types of quadrangular pyramid-shaped convex portions 3 in the reflecting portion 2 of the light guide plate 1 in an irregular pattern including the orientation. The brightness of 1 can be improved efficiently.

Moreover, as the kind of shape in the above-mentioned different kind of quadrangular pyramid-shaped convex part 3, there exist the following, for example.
That is, there are a quadrangular pyramid shape having a different shape (for example, a regular quadrangular pyramid shape and a slanted quadrangular pyramid shape), and a quadrangular pyramid shape having a different size (for example, a similar shape).
A light guide plate 31 shown in FIG. 7A is an example in which the above-described different types of quadrangular pyramidal convex portions 33 are arranged in an irregular pattern including the direction in the reflection portion 32 of the light guide plate 31.
Further, the light guide plate 34 shown in FIG. 7B is configured by regularly arranging the required number of the quadrangular pyramid-shaped convex portions 36 of the same type in the reflection portion 35 of the light guide plate 34. In addition, the same kind of quadrangular pyramid-shaped convex portions 36 described above are configured to have the same orientation for each.

1 and FIG. 2, the light guide plate forming mold processing apparatus shown in FIG. 1 and FIG. 2 processes the light guide plate 1 having the convex portions 3 into a light guide plate forming die (a split die 43 described later) for resin molding. A mold material mounting means A for mounting a mold material 8 (material to be processed) and a processing tool having a required shape corresponding to the convex portion 3 (in the illustrated example, a processing tool 9 having a quadrangular pyramid shape). ) And the above-described processing tool 9 in the state in which the above-mentioned processing tool 9 is vibrated in the pressing direction (in the Y direction) with respect to the mold material 8 mounted on the above-described mounting means A The pressing means B for forming the concave portion 10 corresponding to the shape of the convex portion 3 on the above-described mold material 8 (the surface thereof) by pressing with the speed and the required angle, and the above-described mounting means A control means C for controlling A and the pressing means B (that is, the above-described processing apparatus); It is composed of a frame D for mounting a mounting device A and the pressing means B was.
That is, in the processing apparatus described above, by controlling the mounting means A and the pressing means B by the control means C, the processing tool 9 of the pressing means B is vibrated in the pressing direction, The above-described processing tool 9 can be pressed with a required pressure, a required speed and a required angle with respect to the mold material 8 of the mounting means A described above.
Therefore, it is configured such that the concave portion 10 having a required shape corresponding to the shape of the convex portion 3 can be formed on the above-described mold material 8 (surface thereof) by using the processing tool 9 described above.
The above-described concave portion 10 having the required shape has a required depth S, and the required depth S corresponds to the height H of the convex portion 3 described above.

In addition, since the above-described recess 10 is pressed in the above-described mold material 8 in a state where the above-described processing tool 9 is vibrated in the pressing direction, the inside surface of the above-described recess 10 is subjected to vibration processing. It is comprised so that the inner surface of the said recessed part 10 can be efficiently processed into a mirror surface.
Accordingly, when the light guide plate 1 having the different types of quadrangular pyramid-shaped convex portions 3 is resin-molded with a light guide plate molding die, the concave portion 10 formed in the mold material 8 is used as the molding resin (light guide plate 1). By transferring, the side surface 6 of the quadrangular pyramid-shaped convex portion 3 can be efficiently formed on the mirror surface.

  Further, referring to the irregular pattern including the orientation of the different types of quadrangular pyramid-shaped convex portions 3 provided on the reflecting portion 2 of the light guide plate 1 described above, the above-described mold material 8 may be used as the above-described mold material 8 by using the above-described processing apparatus. Since the concave portion 10 corresponding to the shape of the convex portion 3 is formed, the orientation of the different types of quadrangular pyramidal convex portions 3 provided on the reflective portion 2 of the light guide plate 1 is included. An irregular pattern including the direction of the concave portion 10 corresponding to the irregular pattern can be transferred and formed on the mold material 8 described above.

Further, in the above-described mold material mounting means A, the rotating shaft 14 whose axial direction is the Y direction (vertical direction) in a state where the above-described mold material 8 is mounted and the above-described mold material 8 is mounted. A mounting rotation mechanism 15 that rotates the above-described mold material 8 to a required position around the center, and a state in which the above-described mold material 8 is mounted on the mounting rotation mechanism 15 in the X direction (lateral direction) or the Z direction ( A mounting position adjusting mechanism 16 that moves in the vertical direction is provided.
Accordingly, the above-described mounting rotation mechanism 15 can be set by rotating the above-described mold material 8 to a required position, and the above-described rotation by the above-described mounting position adjusting mechanism 16 in advance. By moving the mold material 8 in the X direction (lateral direction) or the Z direction (vertical direction), a required position on the surface of the above-described mold material 8 (position where the above-described recess 10 is formed), and The position of the processing tool 9 that is pressed by the pressing means B can be adjusted by matching the target position of the tip of the processing tool 9.
In addition, at this time, the position of the recessed part 10 formed in the above-mentioned mounting die raw material 8 exists in the tip of the pressing direction in the above-mentioned processing tool 9 tip.

The pressing means B of the processing tool described above includes the pressing mechanism 17 that presses the processing tool 9 in the Y direction (pressing direction) with a required pressure, a required speed, and a required angle, and the pressing mechanism described above. The rotation exchanging mechanism 20 (turn table) for exchanging the above-described processing tool 9 by rotating 17 and the pressing mechanism 17 and the rotation exchanging mechanism 20 are moved in the X direction or the Z direction. Thus, a loading position adjusting mechanism 22 that adjusts the position of the tip of the processing tool 9 is provided.
Accordingly, the pressing means B is configured so that the loading position adjusting mechanism 22 can match the tip position of the processing tool 9 with the required position of the mold material 8 as described above. The processed tool 9 is configured to be pressed against the required position of the mold material 8 by the pressing mechanism 17 described above.
Further, in the above-described pressing means B, the above-described processing tool is obtained by rotating the above-described pressing mechanism 17 (the above-described processing tool 9) to the required replacement position 21 (see FIG. 2) by the above-described rotation exchange mechanism 20. 9 is configured to be exchangeable.

Further, as described above, the processing tool 9 is configured in a quadrangular pyramid shape corresponding to the shape of the quadrangular pyramid-shaped convex portion 3 formed on the light guide plate 1 shown in FIG. As shown in FIG. 2, the above-described processing tool 9 includes a quadrangular pyramid processing portion 12 (head) provided on the distal end side (having a pointed shape) and a loading pin 13 provided on the proximal end side ( Tail).
The pressing mechanism 17 includes a processing tool loading portion 18 for loading the processing tool 9 (part of the loading pin 13) and the processing tool 9 in the Y direction (pressing direction) (for example, In order to press the above-described processing tool 9 against the above-described mounting die material 8 (the above-mentioned mounting means A), the above-described processing tool 9 and the loading unit 18 vibrate. A pressing slide portion 23 that moves the attaching portion 19 (as described above in the pressing mechanism 17) integrally to the mounting means A (as described above in the pressing direction) is provided.
Therefore, when the processing tool 9 is replaced, the processing tool 9 can be replaced by detachably loading the loading pin 13 of the processing tool 9 into the loading portion 18 of the pressing mechanism 17 described above. It is configured.
Further, at the time of pressing the mounting mold material 8 by the pressing mechanism 17 described above,
First, the front end position of the processing tool 9 (the processing section 12) is matched with the required position of the mold material 8 mounted on the mounting means A, and then the processing tool 9 is moved by the vibration applying section 19 to Y. The shape of the above-described processing tool 9 at the required position of the above-described mold material 8 by pressing the above-described processing tool 9 against the mounting mold material 8 in a state of being vibrated in the direction (pressing direction). The concave portion having the required shape can be formed corresponding to the above.

Further, as described above, the above-described pressing mechanism 17 is configured such that the above-described processing tool 9 can be pressed into the above-described mounting mold material 8 at a required pressing angle.
In this case, for example, the concave portion (10) corresponding to the oblique quadrangular pyramid-shaped convex portion (3) in the light guide plate 1 can be formed in the mounting mold material 8 described above.
Further, in the loading portion 18, the processing tool 9 is rotated at a required angle so that the concave portion 10 having a required direction corresponding to a required direction of the quadrangular pyramid-shaped convex portion 3 in the light guide plate 1 is formed. The die material 8 can be pressed.
Therefore, by using the processing tool 9 rotated and set at the required angle, the concave portion 10 corresponding to the required direction of the (different) quadrangular pyramid-shaped convex portion 3 in the light guide plate 1 is described above. The mold material 8 can be formed by pressing.

  As described above, the processing apparatus includes the mounting position adjusting mechanism 16 including the mounting rotation mechanism 15 in the mold material mounting means A and the loading position adjusting mechanism 22 in the pressing means B described above. Since the mounting position adjusting mechanism 16 and the loading position adjusting mechanism 22 are used, the relative position between the mold material 8 and the processing tool 9 can be adjusted. Has been.

Next, a method of processing the mold material 8 (divided mold of the light guide plate forming mold) using the processing apparatus shown in FIGS. 1 and 2 will be described.
First, in the processing apparatus shown in FIGS. 1 and 2, the mold material 8 is mounted on the mounting rotation mechanism 15 of the mounting means A, and the mounting position adjusting mechanism 16 including the mounting rotation mechanism 15 is loaded. By using the position adjusting mechanism 22 in advance to adjust the relative position between the mold material 8 and the processing tool 9 in advance, the processing tool described above corresponding to the required position of the mounting mold material 8 described above. Match the tip position of 9.
At this time, there is a required position of the mounting mold material 8 at the tip in the pressing direction at the tip of the processing tool 9.
Next, in a state where the processing tool 9 of the pressing means B described above is vibrated by the vibration applying portion 19 of the pressing mechanism 17 described above, and the pressing mechanism 17 as a whole is pressed in the pressing direction by the pressing slide portion 23 described above. By pressing the above-mentioned processing tool 9 with a required pressure, a required speed and a required angle, the surface of the mounting mold material 8 has the required depth S described above and the above-described processing is performed. The recess 10 having a required shape corresponding to the quadrangular pyramid shape of the tool 9 is formed by machining.
Next, for example, the light guide plate 1 having the above-described different quadrangular pyramid-shaped convex portions 3 is resin-molded by, for example, performing the pressing process using the processing tool 9 as described above on the mold material 8 as described above. A light guide plate molding die (divided die) can be processed and formed.
That is, the light guide plate 1 provided with the quadrangular pyramid-shaped convex part 3 having a mirror surface can be resin-molded by the above-described light guide plate molding die.
Therefore, according to the present invention, the light guide plate molding die can be processed with one processing device as compared with the conventional LIGA method that requires a large number of processing devices. Can be processed efficiently.
Further, according to the present invention, a “light guide plate forming mold processing method” and “a light guide plate forming mold” that can efficiently process a light guide plate forming mold for resin-molding a light guide plate capable of improving luminance efficiently. A light guide plate molding die processing apparatus ”can be provided.
Further, according to the present invention, a “light guide plate molding die” is formed by resin molding a light guide plate that is processed by the above-described “light guide plate molding die processing method and processing apparatus” and that can improve the luminance efficiently. Can be provided.
Further, according to the present invention, the resin is molded by the “light guide plate molding die” processed by the “light guide plate molding die processing method and processing apparatus” and the luminance can be improved efficiently. A possible “light guide plate” can be provided.

Moreover, in the said Example, although the square-pyramidal processing tool 9 shown in FIG. 3 (1) was illustrated as said processing tool, in the processing tool which has a draft, ie, the process part of the above-mentioned processing tool, A configuration of a processing tool having a thin tip end and a thick base end can be employed.
For example, the conical processing tool 37 shown in FIG. 3 (2), the truncated pyramid processing tool 38 shown in FIG. 8 (1), or the truncated conical processing tool 39 shown in FIG. 8 (2) is employed. May be.
Although not shown, a polygonal pyramid-shaped processing tool, a polygonal frustum-shaped processing tool, a cylindrical processing tool, or a polygonal columnar processing tool may be used as the processing tool.

Moreover, in the above-mentioned Example, the structure which forms the one recessed part 10 by one press processing in the above-mentioned metal mold | die material 8 using the one processing tool 9,37,38,39 is illustrated. However, as shown in FIG. 9, a configuration using a connecting processing tool 24 in which a plurality of required processing tools are fixed on the base end side (loading pin) may be employed.
9 includes the above-described quadrangular pyramid-shaped processing tool 9, the conical processing tool 37, the quadrangular pyramid-shaped processing tool 38, and the frusto-conical processing tool 39. It is configured.
Therefore, as compared with the case where one processing tool described above is used, the above-described mold material is formed by pressing using the above-described connecting processing tool 24 (in a state where the above-described connecting processing tool 24 is vibrated). The light guide plate molding die (divided die) can be efficiently formed once in eight.

Moreover, in the said Example, although the structure which press-processes with respect to the above-mentioned metal mold | die material 8 in the state which vibrated the above-mentioned processing tool 9 was illustrated, it described above in the state which did not vibrate the above-mentioned processing tool 9 A configuration in which the die material 8 is pressed may be employed.
In this case, the inner surface of the recess 10 formed in the mold material 8 can be efficiently formed into a mirror surface.

Moreover, in the above-described embodiment, the configuration in which the concave portion 10 is pressed once on the above-described mold material 8 is illustrated. For example, the above-described processing tool 9 is required for the above-described mold material 8. A single recess 10 may be formed by pressing the same position of the mold material 8 described above.
At this time, processing conditions such as pressing force and pressing speed may be changed for each pressing process described above.
For example, a configuration may be adopted in which the pressing speed is moderated at the beginning and the pressing speed is increased later (or vice versa).
Therefore, the inner surface of the recess 10 formed in the mold material 8 can be efficiently formed into a mirror surface.

Next, the light guide plate forming mold shown in FIGS. 4A and 4B will be described.
In other words, the light guide plate forming mold shown in the figure is composed of a fixed upper mold 41 and a movable lower mold 42 arranged to face the fixed mold 41 described above.
Further, in the processing step of the light guide plate forming mold (divided mold) described above, the mold material 8 having the concave portion 10 that has been pressed in a state where the processing tool 9 is vibrated is formed of the lower mold 42 described above. The split mold 43 is incorporated into the molds 41 and 42 described above.
Further, the light guide plate forming cavities (upper cavities 44 and lower cavities 45) are provided on both the molds 41 and 42 as described above.
Therefore, the light guide plate 1 described above can be resin-molded by the resin molding method (so-called injection molding method) for a normal light guide plate using the light guide plate molding dies 41 and 42 described above.
That is, as shown in FIG. 4A, first, the molds 41 and 42 are clamped, and a resin (transparent resin) is injected and filled into the upper and lower cavities 44 and 45 described above.
Next, as shown in FIG. 4 (2), by opening the molds 41 and 42, the light guide plate corresponding to the shapes of the cavities 44 and 45 in the cavities 44 and 45 described above. 1 is resin-molded.
On the reflecting portion 2 of the light guide plate 1, a quadrangular pyramid-shaped convex portion 3 having an irregular pattern including a direction is formed.
Therefore, the light guide plate capable of improving the luminance efficiently by the light guide plate forming molds 41 and 42 according to the present invention can be resin-molded.
That is, according to the present invention, it is possible to provide a light guide plate molding die that can resin-mold a light guide plate that can efficiently improve luminance.
Moreover, according to this invention, the light-guide plate which can improve a brightness | luminance efficiently can be provided.

In the above-described embodiment, the configuration in which the light guide plate that improves the luminance in terms of optical design is obtained by forming the quadrangular pyramid-shaped convex portions on the reflection portion (reflection surface) of the light guide plate 1 is described. It is possible to adopt a configuration in which convex portions having a required shape are arranged in a required regular pattern including a required direction on the required portion (required portion).
For example, the structure which provides a convex part of required shape in the light-emitting part (light-emitting surface) of an above-described light-guide plate is employable.

  In addition, as a convex part of required shape formed in the above-mentioned light guide plate, it replaces with the above-mentioned quadrangular pyramid-shaped convex part 3, for example, a polygonal convex part, a cone-shaped convex part, and a polygonal frustum-shaped convex part. , A frustoconical convex part, a convex part with a narrow tip side and a thick base end side, a convex part with a draft (from a light guide plate molding die), a cylindrical convex part, a polygonal columnar convex part, etc. Can be employed (see the shape of the processing tool described above).

In the above-described embodiment, as the material of the mold material 8 to be the split mold 43,
Porous materials can be employed.
The porous material described above has communication bubbles that can be ventilated, and is configured so that a fluid such as air can be forcibly fed or sucked from one surface of the material to the other surface. ing.
That is, when the above-described porous material is used for the split mold 43 of the molds 41 and 42 shown in FIGS. 4 (1) and 4 (2), the cavity 45 (44) is formed when the light guide plate is released. By forcibly feeding air into the interior, the light guide plate 1 can be efficiently released.
In particular, the above-described air pumping from the split mold 43 side is applied to the light guide plate by, for example, a cylindrical convex portion or a polygonal columnar convex portion (that is, the distal end side and the proximal end side have the same shape and the same size). This is effective when forming the convex portion of the light guide plate, and the light guide plate having the convex portion of the shape can be efficiently released.
Further, when the above-described porous material is used for the split mold 43, air can be naturally discharged from the concave portion 10 of the split mold 43 at the time of resin molding of the above-described light guide plate, and the resin is put into the concave portion 10. Since it can be filled efficiently, a convex portion having a required shape can be efficiently formed on the light guide plate.
In particular, when air is forcibly sucked and discharged from the resin molding surface (inside the recess 10) of the porous material (mold material), the recess 10 can be efficiently filled with resin, and the light guide plate The convex part of a required shape can be formed efficiently.
Examples of the porous material described above include a porous metal material formed by sintering metal powder.

In addition, a metal material having a low hardness (such as a copper plate) such as a copper plate can be used as the mold material.
Further, as the above-described mold material, a mold material obtained by performing copper plating of a required thickness on a required material to be a base can be processed into the copper plating part.
Further, a diamond processing tool can be adopted as the processing tool.

In the above-described embodiments, the light guide plate has been described as an example. However, according to the spirit of the present invention, the present invention can be applied to processing a mold for resin-molding an optical component.
For example, the present invention can be applied to processing a mold for resin molding of an optical component of a display device using organic EL (Electroluminescence).

  The present invention is not limited to the above-described embodiments, and can be arbitrarily modified and selected as necessary within a range not departing from the gist of the present invention. It is.

  By efficiently improving the brightness of the light guide plate, the brightness of the liquid crystal display device provided with the light guide plate can be improved efficiently, so that the operator can efficiently position the input characters and the like displayed on the display device. It can be applied to applications where direct viewing is essential.

FIG. 1 is a schematic front view schematically showing a processing device for a light guide plate molding die used in a processing method for processing a light guide plate molding die for resin molding a light guide plate according to the present invention. FIG. 2 is a schematic plan view of the processing apparatus shown in FIG. 3 (1) and FIG. 3 (2) are partially cutaway schematic perspective views schematically showing a processing tool loaded in the processing apparatus shown in FIGS. 1 and 2, and FIG. A pyramid-shaped processing tool is shown, and FIG. 3B shows a conical processing tool. 4 (1) and FIG. 4 (2) are schematic longitudinal sectional views schematically showing a light guide plate molding die processed by the processing apparatus shown in FIGS. 1 and 2, and FIG. Shows the mold clamping state of the above-mentioned mold, and FIG. 4 (2) shows the mold open state of the above-mentioned mold. FIG. 5 is a partially cutaway perspective view schematically showing a light guide plate resin-molded by the light guide plate forming mold shown in FIGS. 4 (1) and 4 (2). 6 (1) is a schematic longitudinal sectional view of the light guide plate as seen from the front side of the quadrangular pyramid-shaped convex portions formed on the light guide plate having the quadrangular pyramid-shaped convex portions shown in FIG. 2) is a schematic plan view of a light guide plate having a quadrangular pyramid-shaped convex portion shown in FIG. 7 (1) and 7 (2) are schematic plan views schematically showing a light guide plate having a quadrangular pyramid-shaped convex portion, and FIG. 7 (1) shows the same kind of quadrangular pyramid-shaped convex portion. FIG. 7B shows an example in which different types of quadrangular pyramid-shaped convex portions are irregularly arranged. 8 (1) and FIG. 8 (2) are partially cut out schematic perspective views schematically showing other processing tools loaded in the processing apparatus shown in FIGS. 1 and 2, and FIG. FIG. 8 (2) shows a truncated cone-shaped processing tool. FIG. 9 is a partially cutaway schematic perspective view schematically showing another processing tool loaded in the processing apparatus shown in FIGS. 1 and 2.

1 Light guide plate 2 Reflection part (reflection surface)
3 quadrangular pyramid shaped convex portion 4 square bottom surface 5 bottom side 6 triangular side surface 7 hypotenuse 8 mold material 9 processing tool 10 recess 11 vertex 12 processing unit 13 loading pin 14 rotation axis (Y axis)
DESCRIPTION OF SYMBOLS 15 Mounting rotation mechanism 16 Mounting position adjustment mechanism 17 Press mechanism 18 Loading part 19 Vibration imparting part 20 Rotation exchange mechanism (turntable)
21 Exchange position 22 Loading position adjustment mechanism 23 Press slide part 24 Connection processing tool 31 Light guide plate 32 Reflection part 33 Different kind of quadrangular pyramidal convex part 34 Light guide plate 35 Reflective part 36 Same kind of quadrangular pyramidal convex part 37 Conical processing tool 38 Square Frustum-shaped Processing Tool 39 Frustum-shaped Processing Tool 41 Fixed Upper Die 42 Movable Lower Die 43 Divided Die 44 Upper Cavity 45 Lower Cavity A Mold Material Equipment B Bending Tool Pressing C C Control D H Height L Length S Depth α Angle of the apex angle

Claims (2)

Convex having the above-mentioned required shape on the above-mentioned mold material by pressing the mold material in a state where the processing tool corresponding to the shape of the convex portion having the required shape provided on the light guide plate is vibrated. It is a processing method of a mold for forming a light guide plate that forms a recess having a required shape corresponding to the shape of the part,
A method for processing a mold for forming a light guide plate, comprising pressing a plurality of the above-described processing tools and a fixed connecting processing tool in a state of vibrating the above-described mold material. A mold material mounting means for mounting a mold material to be processed into a light guide plate molding mold for resin molding a light guide plate provided with a convex portion having a required shape, and a shape of the convex portion having the required shape described above. A light guide plate molding die processing apparatus comprising: a corresponding processing tool; and pressing means for pressing the above-described processing tool in a state where the processing tool is vibrated against the mold material mounted on the mounting means. An apparatus for processing a light guide plate molding die, comprising a plurality of required processing tools and a fixed connection processing tool.

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