TWI728925B - Stamping steel knife die for light guide plate and light guide plate made of it - Google Patents

Abstract

A stamping steel knife die for light guide plate and light guide plate made of it is disclosed. The stamping steel knife die is installed on the stamping machine, and the stamping steel knife die includes an upper module and a lower module. The upper module includes a closed-loop cutter and a buffer. The closed-loop cutter is steel that is processed by the upper module and protrudes from the upper module and has at least one light incident surface cut portion, the light incident surface cut portion has an angle of 45 to 55 degrees between a blade surface and a back surface of the light incident surface cut portion, and the buffer is located in the closed-loop cutter. The lower module for carrying a light guide plate and the maximum distance between the side surface of the lower module and the blade surface is 0.04 to 0.11mm. Wherein, after the upper module is pressed downward to make the buffer press against the surface of the light guide plate, the light incident surface cut portion continues to move toward the light guide plate so that the blade surface of the light incident surface cut portion cuts the light guide plate, and the light guide plate made from it can maintain at least 80% of the effective light incident area. In this way, the service life of the closed-loop cutter can be increased and the consistency of the quality of the light guide plate and the light incident efficiency can be maintained.

Description

Stamping steel knife mold of light guide plate and light guide plate made of it

The present invention is related to the field of light guide plate processing equipment, in particular to a stamping steel knife die of a light guide plate and a light guide plate made from it.

In the field of light guide plate production, in response to production methods or product requirements, there are common processes that require processing optical plates into the required size, and most of the light guide plates use the cutting surface as the light-incident surface during application. The surface condition has a considerable degree of requirements, and the condition of the cutting surface is closely related to the selected cutting method.

The knife mold is a tool used to cut the object to be processed into a desired shape. Traditional techniques include wooden knife molds, etching knife molds, etc. The wooden knife mold uses a wooden board as a base, and a plurality of blades are set on the wooden board. Cutting the items to be processed is generally more commonly used for semi-punched processing requirements. The etching knife mold is to process the base material into the required knife shape through etching and other processing, and then cut it.

However, although the wooden knife mold has the advantage of low cost, the processing force tolerance of the wooden knife mold is extremely low, and the effective use times are only about 5~6K, so the number of die-cutting times that a single wooden knife mold can use is quite small. Although the etching knife mold has better force tolerance than the wooden knife mold, it will be damaged under the processing force of about 20K, so it is not suitable for thicker plates, and it still has a low die cutting frequency. The missing. In addition, the existing die die has the problem of insufficient structural strength, so it is often necessary to replace the product that has not been produced to meet the single shipment quantity, which will cause the quality of the finished stamping mass production to be extremely poor. For example, there will be a gap between the quality of several batches of products cut by the current die, and the quality of several batches of products cut by the new die after the current die is damaged. This part is also different from the related manufacturers. One of the problems that needs to be overcome urgently.

In the processing field, another technology that can process the target into the required structure shape is stamping. The feature of stamping is that the target can be broken or torn through the mold, but when stamping, the target is affected by the mold. During the deformation process, the impact surface formed by the impact is first deformed in response to the force, and when the material is subjected to the critical point, it will be cracked, and then form a torn non-flat surface. The surface is not only quite rough, but also It is easy to produce burrs left after the material is torn off. Therefore, the existing stamping technology is not suitable for optical material plates such as light guide plates, because a slight structural drop on the light guide plate will greatly affect the light guiding in subsequent applications, let alone a rough and uneven surface.

In view of this, the inventor of the present invention has accumulated rich experience in related industries for many years, and conceived and proposed a stamping steel die for light guide plate and the light guide plate made of it, so as to provide high durability processing suitable for optical materials made of plates. Mold.

One purpose of the present invention is to provide a stamping steel knife mold for light guide plate and the light guide plate made therefrom, which can be applied to the cutting of light guide plate, and can effectively improve the service life of the mold through the stamping characteristics, so that The light entrance surface of the light guide plate formed after cutting has a sufficient effective light entrance area, and the light entrance efficiency that meets the requirements can improve the light output brightness of the finished light guide plate.

In order to achieve the above objective, the present invention discloses in one embodiment a stamping steel die for a light guide plate, which can be installed in a stamping machine for stamping and cutting the light guide plate, including: an upper module with a closed-loop cutter and a A buffer member, the closed-loop cutter is a steel material protruding and extending from the upper module after the upper module is processed, and has at least one cut portion of the light incident surface, and the cut portion of the light incident surface has a blade surface and a blade back And the blade face and the back of the knife form an included angle, the included angle is 45-55 degrees; the buffer is arranged in the closed-loop tool, and the cut portion of the light incident surface can move up and down relative to the buffer; and The lower module is set under the upper module to support the light guide plate, and the maximum distance between the side of the lower module and the blade surface is 0.04~0.11mm; wherein, when the upper module is pressed down toward the lower module, the buffer After the piece is pressed against the surface of the light guide plate, the light incident surface cutting part continues to move toward the light guide plate, so that the blade surface cuts the light guide plate, thereby using the punching characteristics of the punching machine to increase the service life of the closed-loop tool , Maintain the quality consistency of a large number of processed light guide plates, and use the light incident surface cut part to maintain the light incident efficiency of the light guide plate.

In order to have better processing efficiency and performance, and to ensure the structural strength of the cut portion of the light incident surface, in another embodiment, it is disclosed that the included angle is 50 degrees.

Similarly, in order to make the cutting action of the stamping steel die more smooth and to keep the light incident efficiency of the light incident surface of the cut light guide plate constant, in the next embodiment, the side surface of the lower module and the blade surface are disclosed. The maximum distance is 0.1025mm. Furthermore, in another embodiment, it is disclosed that the maximum distance between the side surface of the lower module and the blade surface is 0.0550 mm, which can also enable the cut light guide plate to have excellent optical application performance.

In order to cope with light guide plates of larger or various sizes, and to make the light guide plate more stable during cutting, in one embodiment, it is disclosed that the stamping steel die further includes a plurality of movable supporting blocks, which are separately arranged on the peripheral side of the lower module And there is a gap with the lower module to carry the light guide plate.

In addition, in another embodiment, it is disclosed that the vertical length of the blade surface is 0.135~0.151mm, so as to have better processing performance.

In the next embodiment, it is disclosed that the buffer includes a movable pressure block and a plurality of elastic elements, the movable pressure block is provided for pressing against the light guide plate, one end of the elastic elements is connected to the cutter, and the other end is connected to the tool. Movable briquette, so the system can provide sufficient cushioning effect during processing.

Alternatively, in one embodiment, it is disclosed that the cushioning member is made of a compressible material to provide a cushioning effect.

In view of the needs of some light guide plate products, in another embodiment, it is disclosed that the closed-loop cutter has two light-incident surface cutting parts, and the light-incident surface cutting parts are symmetrically arranged so as to make the guide during punching and cutting. The light plate forms two light incident surfaces.

The present invention also discloses in one embodiment a light guide plate, which is cut and formed by the stamping steel die of the light guide plate of the foregoing embodiments, and includes: at least one light incident surface is formed by cutting through the blade surface for providing Receiving side-entry light, and its effective light incident area is not less than 80% of the total cross-sectional area; and a light exit surface, which is arranged adjacent to the light entrance surface, and the light enters from the light entrance surface and forms light from the light exit surface, As a result, the light guide plate formed by the stamping steel die of the foregoing embodiments has an excellent light output performance.

In summary, the stamping steel knife mold of the light guide plate and the light guide plate made of the light guide plate disclosed in the present invention are stamping and cutting molds designed for optical grade plates. The characteristics of the punching machine greatly improve the use of tools. Life, thereby reducing the damage degree of the mold under a large amount of cutting processing, and at the same time, it can have excellent quality stability of the quantity and product. In addition, in response to the characteristics of optical-grade plates, the stamping steel die disclosed in the present invention also has corresponding blade structure features to prevent deformation and pulling on the cut surface of the light guide plate during stamping, and effectively allow the light guide plate to be formed by stamping and cutting. Glossy surface has excellent light incident efficiency. Regarding the detailed technical characteristics of the cut part of the light-incident surface of the ring-closed tool, there are further restrictions to provide a more excellent stamping die and to make the light guide plate after stamping and cutting have better optical performance.

1: Stamping steel die

10: Upper module

101: Closed loop tool

1011: Glossy cutting part

1012: blade face

1013: The back of the knife

102: buffer material

1021: movable briquette

1022: elastic element

11: Lower module

12: Activity support block

2: Light guide plate

2a: Light guide plate

20: Glossy surface

20a: The effective light incident area of the light incident surface

21: Glossy surface

θ: included angle

D: The maximum distance between the side of the lower module and the blade surface

L: The vertical length of the blade surface

Figure 1 is a schematic diagram of a stamping steel die structure according to an embodiment of the present invention.

Figure 2 is a partial structural diagram of a stamping steel die according to an embodiment of the present invention.

Figure 3 is a schematic diagram of the application of a stamping steel die according to an embodiment of the present invention.

Figure 4 is a schematic diagram of the structure of a stamping steel die according to another embodiment of the present invention.

Figure 5 is a partial structural diagram of a stamping steel die in another embodiment of the present invention.

Figure 6 is a schematic diagram of the application of a stamping steel die according to another embodiment of the present invention.

FIG. 7A is a schematic diagram of the effective light incident area of the light incident surface of the light guide plate cut by the stamping steel knife die of the present invention.

Figure 7B is a comparison diagram of the cutting surface state of the light guide plate after being cut by different cutters.

As mentioned above, in the field of light guide plate processing, it is often necessary to go through the cutting process to make the ruler of the light guide plate meet the requirements. The problem now is that the durability of the die is insufficient, in addition to the frequent replacement of the die, the processing In addition to the increase in cost, the quality of the light guide plate is also uneven. However, other processing technologies are limited by the processing principle and cannot be applied to light guide plates, which have high surface integrity, structural accuracy and fineness requirements for the light-incident surface. Therefore, the inventor has developed and designed a new processing fixture based on die technology and stamping technology, which can cut the light guide plate by stamping, and has a longer service life and maintains The quality consistency under mass production and the elimination of the influence of traditional stamping on the light incident surface. Therefore, the light guide plate produced by this processing fixture can achieve a high effective light incident area ratio on the light incident surface, and then The application can have a very high average brightness. The following is a description of the stamped steel knife mold of the light guide plate and the light guide plate made of the light guide plate proposed by the present invention through the drawings and text.

Please refer to Figures 1 and 2, which are a schematic diagram of the structure of a stamping steel die and a schematic diagram of a partial structure of the stamping steel die of an embodiment of the present invention. The figures shown in each figure are only used to illustrate the technology of the present invention. The use of features does not indicate the actual size or shape. The stamping steel die 1 of the light guide plate disclosed in the present invention is provided to be installed in a stamping machine (not shown in the figure) for punching and cutting the light guide plate, and includes an upper module 10 and a lower module 11. Wherein, the aforementioned light guide plate 2 can be made of plastics such as PC, PMMA or PS, and its thickness is about 0.2 to 0.6 mm.

The upper module 10 is provided with a closed-loop cutter 101 and a buffer member 102. The closed-loop cutter 101 is a steel material protruding and extending from the upper module 10 after the upper module 10 is processed, and has at least one light-incident surface cutting portion 1011. That is, the closed-loop cutter 101 is a closed ring structure, and is attached to a part of the upper module 101 and is made of steel. In this way, the closed-loop cutter 101 can have a better processing tolerance, which can reach a tolerance of about 500K. The light incident surface cutting portion 1011 has a blade surface 1012 and a blade back surface 1013, and the blade surface 1012 and the blade back surface 1013 form an included angle θ, which is 45 to 55 degrees. The buffer material 102 is arranged in the closed-loop cutter 101, and the light incident surface cutting portion 1011 can move up and down relative to the buffer member 102. More specifically, the buffer member 102 abuts against the inner surface of the ring-closed cutter 1011, and the light-incident surface cutting portion 1011 and the buffer material 102 are movably arranged, so that the light-incident surface cutting portion 1011 and the buffer material The piece 102 has different displacement strokes. Incidentally, since the stamping steel die 1 is used to cut the light guide plate, in response to the processing requirements and material characteristics of the light guide plate, the buffer material 102 plays an important role in preventing the light guide plate from shifting or warping during processing to ensure processing quality.

The lower module 11 is arranged under the upper module 10 for carrying the light guide plate 2 to be processed, and the maximum distance D between the side of the lower module 11 and the blade surface 1012 is 0.04~0.11 mm. Wherein, when the upper module 10 is pressed down toward the lower module 11 and the buffer 102 is pressed against the surface of the light guide plate, the light incident surface cutting portion 1011 continues to move toward the light guide plate 2 for the blade surface 1012 to cut the light guide plate . In this way, the punching characteristics of the punching machine can be used to increase the service life of the closed-loop cutter 101, maintain the quality consistency of a large number of processed light guide plates, and use the light incident surface cutting portion 1011 to maintain the light incident efficiency of the light guide plate. Among them, if the light guide plate needs to be cut into shape, if it only needs to form a single light incident surface, the closed-loop cutter 101 is correspondingly designed to have a light incident surface cutting portion 1011 The other side of the light guide plate is cut into shape according to the rest of the closed-loop cutter 101 with the displacement of the upper module 10 under the pressure, and because the other side of the light guide plate is not used as the light incident surface, the other side of the light guide plate is not used as the light incident surface. The application performance of the light guide plate will not be affected too much due to the stamping process, which is described here.

More specifically, in order to prevent the pressing deformation and burrs on the light-incident surface of the light guide plate caused by the pressing process, the present invention is to provide a closed-loop cutter 101 on the upper module 10 to allow the light guide plate 2 to respond under the pressing action. The cut portion 1011 of the light incident surface of the closed-loop cutter 101 is in a cut state, and the light incident efficiency of the light incident surface formed by the cutting can be maintained, so as to avoid the influence of the incomplete structure on the light utilization. In order to make the light incident surface cutting part 1011 cut the light guide plate accurately and accurately, and to consider the rigidity of the light incident surface cutting part 1011, the angle θ between the blade surface 1012 of the light incident surface cutting part 1011 and the knife back 1013 and the lower module 11 The maximum distance D between the side surface and the blade surface 1012 is limited. More specifically, the back 1013 of the knife is in a sloped state to facilitate the support of the closed-loop tool 101 during processing. That is, the structure of the back 1013 of the knife can determine the thickness of the cut portion 1011 on the light incident surface. The blade surface 1012 is opposite to the inclination direction of the blade back 1013 to form the aforementioned included angle θ. By controlling the included angle θ to fall within the aforementioned range, the light-incident surface cutting portion 1011 has sufficient thickness to have High durability, preventing the cutting portion 1011 of the light incident surface from being too thin to make the blade surface 1012 easy to break. In order to prevent the blade surface 1012 from colliding with the lower module 11 during processing, the blade surface 1012 must be kept at a certain distance from the lower module 11, but the distance should not be too far to avoid affecting the cutting accuracy of the light guide plate 2, and the distance should not be too close. The blade surface 1012 may still hit the lower module 11. After many tests and experiments, when the maximum distance D between the side of the lower module 11 and the blade surface 1012 is 0.04~0.11mm, the above problems can be effectively avoided and the cutting The cut light guide plate corresponds to the formed light incident surface with a complete and flat appearance, and the light incident efficiency can be maintained.

In an implementation state, the angle between the blade surface 1012 and the blade back 1013 is 50 degrees, so that the system can have a better structure presentation, so that the light-incident surface cutting portion 1011 has high durability, and can enhance the Work efficiency. The blade surface 1012 can be inclined symmetrically or asymmetrically with the blade back 1013, so that the angle between the blade surface 1012 and a vertical plane passing through the intersection of the blade surface 1012 and the blade back 1013 may be equal to or not equal to the blade The angle between the back surface 1013 and the aforementioned vertical surface.

Regarding the maximum distance D between the side surface of the lower module 11 and the blade surface 1012, in an implementation state, the maximum distance D is 0.1025mm. Under this distance limit, when the upper module 10 is pressed down to the lower module 11, the light incident surface is cut When the blade surface 1012 of the part 1011 cuts the light guide plate, it can make the light incident surface formed on the light guide plate meet the performance of the light incident efficiency required by the subsequent application, and make the cut light guide plate have a good average Out of brightness. When the maximum distance D between the side surface of the lower module 11 and the blade surface 1012 is 0.0550mm, the light guide plate formed by cutting can also allow the light guide plate to be cut by the cutting edge surface 1012 and the light incident surface formed by the cutting blade surface 1012 has an excellent light entrance surface. Light efficiency, and make the cut light guide plate have a good average brightness. In this embodiment, the maximum distance D between the side surface of the module 11 and the blade surface 1012 is 0.1025 mm as an example.

On the other hand, the vertical length L of the blade surface 1012 is disclosed to be 0.135~0.151mm in an implementation state. The vertical length L of the blade surface 1012 can determine the total length of the blade structure used to cut the light guide plate, and under the aforementioned range conditions The blade surface 1012 can make the light incident surface of the cut light guide plate have better light incident efficiency, so as to avoid the total length of the blade from being too long and affecting the state of the light incident surface formed by the cutting, or the total length of the blade being too short. The light guide plate cannot be cut reliably.

In addition, in order to improve the stability of the light guide plate when it is stamped and cut, the stamping steel die 1 of the present invention may further include a plurality of movable supporting blocks 12, which are separately arranged on the peripheral side of the lower module 11 and have a gap with the lower module 11 to Carrying the light guide plate. As shown in Fig. 1, the movable supporting blocks 12 can be arranged on the peripheral side of the lower module 11 according to the size of the plate to be cut, and the setting position can be adjusted relative to the lower module 11 at any time according to the size of the light guide plate to be cut. The system can provide more support for the light guide plate when punching and cutting, especially the part to be cut When there are more points, the movable support block 12 can effectively prevent the light incident surface from being squeezed and deformed by the stress at the moment of punching.

The buffer 102 arranged in the closed-loop cutter 101 is made of a compressible material as an example in this embodiment. According to this, when the upper module 10 is pressed down toward the lower module 11, the buffer 102 is pressed against the light guide plate On the surface, the buffer 102 will be compressed with the continuous downward displacement of the upper module 10, and then tightly press the light guide plate to prevent displacement or warping of the light guide plate during the stamping and cutting process.

Please also refer to Figure 3, which is a schematic diagram of the application of a stamping steel die according to an embodiment of the present invention. The figure shown in the figure is only used to illustrate the technical features of the present invention, and does not represent the actual size or shape. During processing, the light guide plate 2 to be punched and cut is placed on the lower module 11, and the movable supporting blocks 12 are correspondingly arranged on the side of the lower module 11 to assist in supporting the light guide plate 2, as shown in Figure 3 As shown in (a). After the upper module 10 is pressed and displaced toward the lower module 11 in response to the power provided by the punching machine, the buffer member 102 will first press against the surface of the light guide plate 2. At this time, the upper module 10 continues to move downward, and the buffer member 102 is on the upper side according to the material characteristics. The module 10 is compressed during the continuous pressing process, as shown in Fig. 3(b), and the cutting portion 1011 of the light-incident surface of the ring-closed tool 101 is guided through the blade surface 1012 with the continuous displacement of the upper module 10 The light plate 2 is cut, and the light incident surface 20 of the cut light guide plate 2a is formed there. The other areas of the ring-closed cutter 101 can break off the remaining sides of the light guide plate 2, as shown in Figure 3 (c ) Shown.

Please continue to refer to Figures 4 and 5, which are a schematic diagram of the structure of a stamping steel die and a schematic diagram of the partial structure of a ring-closed tool according to another embodiment of the present invention. It can also be used with Figure 1, where each figure is only for illustration The purpose of describing the technical features of the present invention is not to indicate the actual size or shape. Following the previous implementation, the same technical features will not be repeated here. In this embodiment, the ring-closed cutter 101 has two light incident surface cutting portions 1011, and the light incident surface cutting portions 1011 are symmetrically arranged. In this implementation state, after the light guide plate 2 is cut, two opposite light-incident surfaces will be formed for double-sided light-incident applications. The middle is to facilitate the display of the light-incident surface cutting portion 1011, and the above module 10 is a schematic cross-sectional view here. Similarly, in this structural state, the stamping steel die 1 can also include the movable support blocks 12, and the light incident surface cutting portion 1011 on the closed-loop tool 101, the angle θ between the blade surface 1012 and the blade back 1013 It can also be set to 50 degrees. The maximum distance D between the side surface of the lower module 11 and the blade surface 1012 can be 0.1025mm or 0.0550mm, and the vertical length L of the blade surface 1012 is 0.135~0.151mm. In this embodiment, the side surface of the lower module 11 and the blade surface 1012 The maximum distance is 0.0550mm as an example. For other related detailed technical feature descriptions and corresponding functions, please refer to the corresponding content above.

In this embodiment, the buffer member 102 includes a movable pressure block 1021 and a plurality of elastic elements 1022. The movable pressure block 1021 is pressed against the light guide plate 2. One end of the elastic element 1022 is connected to the closed-loop cutter 101, and the other end is connected to Set at the movable pressing block 1021. In this way, when the upper module 10 is pressed down to the lower module 11, the movable pressing block 1021 is contacted and pressed against the surface of the light guide plate 2, and the elastic element 1022 is compressed in response to the force of the continuous downward movement, so as to cut on the light-incident surface. When the blade surface 1012 of the cutting portion 1011 cuts the light guide plate 2, it has a pressing effect on the light guide plate 2.

Please also refer to Figure 6, which is a schematic diagram of the application of stamping steel die in another embodiment of the present invention. The figure shown in the figure is only used to illustrate the technical features of the present invention, not the actual size or shape. . Similarly, during processing, the light guide plate 2 to be cut is first placed at the lower module 11, and the position of the movable support block 12 is adjusted according to the light guide plate 2 to assist in supporting the light guide plate 2, as shown in Figure 6 (a) Shown. Then the upper module 10 is pressed and moved toward the lower module 11, and after the movable pressing block 1021 of the buffer member 102 is pressed against the surface of the light guide plate 2, the upper module 10 is moved continuously, and the elastic element 1022 will be pressed against The force is compressed, and a stable pressing effect is formed against the light guide plate 2, as shown in Figure 6(b). The two light-incident surface cutting parts 1011 provided on the ring-closed cutter 101 can correspond to the displacement of the upper module 10 The light guide plate 2 is cut through the blade surface 1012 when contacting the light guide plate 2, so that the cut light guide plate 2a forms two opposite light incident surfaces 20, as shown in Fig. 6(c).

Please refer to Figures 3 and 6 again. The light guide plate 2a formed by stamping and cutting by the stamping steel die 1 of the foregoing embodiments has at least one light-incident surface 20, and the aforementioned light-incident surface 20 is through the blade The surface 1012 is formed by cutting, and can be used for receiving side-in light. When the ring-closed tool 101 of the stamping steel die 1 used has a light incident surface cutting portion 1011, the cut light guide plate 2a will form a light incident surface 20, as shown in FIG. 3. When the ring-closed tool 101 of the stamping steel die 1 used has two symmetrically arranged light incident surface cutting parts 1011, the cut light guide plate 2a forms two opposite light incident surfaces 20, such as Shown in Figure 6. The light guide plate 2a after being cut also includes a light-emitting surface 21 which is arranged adjacent to the light-incident surface 20.

Please refer to Figs. 7A and 7B together. Fig. 7A is a schematic diagram of the effective light incident area of the light guide plate which is cut by a stamping steel knife die. Fig. 7B is the light guide plate after being cut by different cutters. A comparison diagram of the cutting surface state, where (a) of Fig. 7B shows the cross-sectional state of the light guide plate after being cut by a traditional knife die, (b) is the cross-sectional state of the light guide plate after being punched by a traditional stamping die, and (c) is the light guide plate The cross-sectional state after being cut by the stamping steel knife disclosed in the present invention. The effective light incident area 20a of the light incident surface 20 of the light guide plate 2a formed by cutting through the stamping steel die 1 of the present invention is not less than 80% of the total cross-sectional area. In an experimental example, the same light guide plate Under the condition of the network point design and the surrounding light bar module structure, the light guide plate was cut and assembled into the module for brightness measurement and comparison. Although the stamping steel die designed by our generation can only ensure the smooth and effective entry of the section The light area is not less than 80%, but the service life of the stamping steel die we designed can reach 200k, which is far better than the 20k stamping times of the die, so we cannot ignore its advantages. From the result theory, when light enters the light entrance surface 20 and forms light from the light exit surface 21, the average brightness of the light output is 5100~5485 cd/m ² , and it has an excellent light output brightness performance. The average brightness of light is an important parameter of the light guide plate product, and the light guide plate 2a made by the stamping steel die 1 proposed by the present invention can reach the average brightness of ^{5100~5485 cd/m 2 and has the} Relatively excellent light rendering.

In the experimental example, for the first tool, the maximum distance D between the side of the lower module 11 and the blade surface 1012 is 0.1025mm; in summary, we also designed the second tool, the side of the lower module 11 is between the side of the lower module 11 and the blade surface 1012. The maximum distance D is 0.0550mm, and the blade height L is 0.149mm. Under the same preliminary test module, the brightness of the low-life die, the first tool and the second tool were compared, and they were 1180cd/m ² , 980cd/m ² and 1038.8cd/m ^{2 respectively} . However, the traditional steel mold breaks the light-incident surface of the light guide plate into a torn surface, which prevents the light from entering, and does not have the commercial value of putting it into the module. It is said that although the first tool has approached 90% of the optical effect of the low-life die, and provided product stability brought about by the long service life, we still hope that the optical performance can be increased to 95% again. In consideration of product applications that cover light-shielding objects, such as light-emitting keyboards, the assembly error of the module can accept 5% light loss. Therefore, the second cutter mentioned above is designed, and the light guide plate formed by the second cutter is cut. The effective area of light incident is more than 88%, and the position of the main optical axis corresponding to the LED light bar maintains flatness. The light guide plate formed by the cutting of the first cutter and the second cutter is tested on the commercial module, and the first test die brightness of the first cutter is 5102.6 cd/m ² , and the second test die brightness It is 5178.cd/m ^2; and a first luminance tested die tool of paragraph 5481.6cd / m ^2, the luminance of the second test die 5472.6cd / m ^2. At this point, we can proudly say that we have successfully innovated the optical grade cutting process of the light guide plate.

In summary, the stamping steel knife mold of the light guide plate and the light guide plate made by the present invention are stamping and cutting molds designed for optical grade plates. The characteristics of the punching machine greatly improve the loop closure. The service life of the tool can reduce the damage degree of the mold under a large number of cutting processes, and at the same time, it can have excellent quality stability of the quantity and product. In addition, in response to the characteristics of optical-grade plates, the stamping steel die disclosed in the present invention also has corresponding blade structure features to prevent deformation and stretching of the cut surface of the light guide plate during stamping. Pull, effectively make the light-incident surface formed by the punching and cutting of the light guide plate have excellent light incident efficiency. Regarding the detailed technical characteristics of the cut part of the light-incident surface of the ring-closed tool, there are further restrictions to provide a more excellent stamping die and to make the light guide plate after stamping and cutting have better optical performance. In particular, these features of the stamping steel die of the present invention are obtained through continuous experiments and tests. It uses the optical material application plate as the design object, so that the light-incident surface of the closed-loop tool is cut For the cutting part, the angle between the blade surface and the back of the blade, and the maximum distance between the blade surface and the side surface of the lower module have certain limitations. On another level, traditional die and stamping belong to completely different technical fields. In essence, they cannot simply be combined or replaced with each other. However, the inventors have absorbed the characteristics and principles of different fields, and then conceived such as The stamping steel die disclosed in the present invention does not simply combine the die and stamping with each other, and is undoubtedly a new and unseen technical means in the field of light guide plate processing.

1: Stamping steel die

10: Upper module

101: Closed loop tool

1011: Glossy cutting part

1012: blade face

1013: The back of the knife

102: buffer material

11: Lower module

12: Activity support block

Claims (10)

A stamping steel knife die for a light guide plate for installation on a stamping machine for stamping and cutting the light guide plate, comprising: an upper module, a closed-loop tool and a buffer part, the closed-loop tool is processed by the upper module The elongated steel material protrudes from the upper module and has at least one cut portion on the light incident surface. The cut portion on the light incident surface has a blade surface and a blade back surface, and the blade surface and the blade back surface form an included angle. The included angle is 45~55 degrees; the buffer member is arranged in the closed-loop cutter, and the light incident surface cutting part can move up and down relative to the buffer member; and the lower module is arranged under the upper module for carrying the light guide plate , And the maximum distance between the side surface of the lower module and the blade surface is 0.04~0.11mm; wherein, when the upper module is pressed down toward the lower module and the buffer member is pressed against the surface of the light guide plate, the light incident surface is cut The part system continues to move toward the light guide plate, so that the blade surface cuts the light guide plate, thereby using the stamping characteristics of the punching machine to improve the service life of the closed-loop tool, maintain the quality consistency of a large number of processed light guide plates, and use the input The smooth cut part maintains the light incident efficiency of the light guide plate. The stamping steel die of the light guide plate according to claim 1, wherein the included angle is 50 degrees. The stamping steel die of the light guide plate according to claim 1, wherein the maximum distance between the side surface of the lower module and the blade surface is 0.1025 mm. The stamping steel die of the light guide plate according to claim 1, wherein the maximum distance between the side surface of the lower module and the blade surface is 0.0550 mm. The stamping steel die of the light guide plate according to claim 1, further includes a plurality of movable supporting blocks, which are separately arranged on the peripheral side of the lower module and have a gap with the lower module to carry the light guide plate. The stamping steel die of the light guide plate according to claim 1, wherein the vertical length of the blade surface is 0.135~0.151mm. The stamping steel die for a light guide plate according to claim 1, wherein the buffer includes a movable pressing block and a plurality of elastic elements, the movable pressing block is provided for pressing against the light guide plate, and one end of the elastic elements is connected with The other end of the closed-loop cutter is connected to the movable pressing block. The stamping steel die of the light guide plate according to claim 1, wherein the buffer member is made of compressible material. The stamping steel die for a light guide plate according to claim 1, wherein the closed-loop cutter has two light incident surface cutting parts, and the light incident surface cutting parts are symmetrically arranged. A light guide plate, which is cut and formed by the stamping steel die of the light guide plate according to any one of claims 1 to 9, comprising: at least one light incident surface, formed by cutting through the blade surface, for receiving Side-entry light, and its effective light-incident area is not less than 80% of the total cross-sectional area; and a light-emitting surface is arranged adjacent to the light-incident surface, and the light enters from the light-incident surface and forms light from the light-emitting surface.

Images