TW200827796A - Injection compression-molding method and mold device of small-sized light guide plate, and small-sized light guide plate - Google Patents

Injection compression-molding method and mold device of small-sized light guide plate, and small-sized light guide plate Download PDF

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Publication number
TW200827796A
TW200827796A TW96128218A TW96128218A TW200827796A TW 200827796 A TW200827796 A TW 200827796A TW 96128218 A TW96128218 A TW 96128218A TW 96128218 A TW96128218 A TW 96128218A TW 200827796 A TW200827796 A TW 200827796A
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TW
Taiwan
Prior art keywords
light guide
guide plate
mold
forming
injection
Prior art date
Application number
TW96128218A
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Chinese (zh)
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TWI358557B (en
Inventor
Toshiyuki Ebina
Kazuhiko Nishida
Original Assignee
Meiki Seisakusho Kk
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Publication date
Priority to JP2006340919 priority Critical
Priority to JP2007185122A priority patent/JP4044608B1/en
Application filed by Meiki Seisakusho Kk filed Critical Meiki Seisakusho Kk
Publication of TW200827796A publication Critical patent/TW200827796A/en
Application granted granted Critical
Publication of TWI358557B publication Critical patent/TWI358557B/zh

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/46Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561Injection-compression moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00Optical elements, e.g. lenses, prisms
    • B29L2011/0075Light guides, optical cables

Abstract

The present invention provides an injection compression-molding method of a small-sized light guide plate showing excellent optical performance while shortening a molding cycle time of the small-sized light guide plate in case of molding the small-sized light guide plate by the injection compression-molding. When the small-sized light guide plate P (having a diagonal dimension of 1 inch to 5 inches and the thickest part of smaller than 0.25 mm to 1.0 mm) is injection compression-molded, a cavity forming surface 62 of a fixed mold 13 and a cavity forming surface 27 of a movable mold 12, and moreover at least one of a sprue bush 56 of the fixed mold 13 or a gate part-forming surface 39 of the movable mold 12 is cooled by cooling medium passages 61, 28, 63, 46 respectively to form the small-sized light guide plate P.

Description

200827796 (1) EMBODIMENT OF THE INVENTION [Technical Field] The present invention relates to an injection compression molding method, an injection compression molding die, and a small light guide plate for a small light guide plate, and more particularly to an injection compression of a light guide plate for a mobile phone. A molding method, an injection compression molding die, and a small light guide plate. [Prior Art] A light guide plate used for a display device such as a liquid crystal, a plasma, or an organic EL is generally formed by injection molding or injection compression molding thereof. When the light guide plate is formed by injection compression molding, it is desirable to shorten the molding cycle time in order to improve the production efficiency. The forming cycle time of the light guide plate depends on its size and thickness. The light guide plate of 8 吋 and 12 mm thick of Patent Document 1 must have a molding cycle time of 1 60 seconds or longer. On the other hand, a small light guide for a mobile phone generally requires a forming cycle time of 1 〇 seconds. There is hardly any known document mentioning the forming cycle time of a small light guide plate, and only a few points are mentioned in Patent Document 2. Patent Document 2 is a light guide plate in which 1 to 8 inches is formed, and it is revealed that "the pressure holding is preferably applied by a pressure of about 2/3 to 1/3 of the peak pressure. 3~1. After 5 seconds, it is further applied with a lower pressure for a few seconds. Usually, in addition to the dwell time, it takes a longer cooling time, plus the injection time, the opening and closing time, the take-out time, etc., and the entire forming cycle time is supposed to be 1 〇 seconds. In particular, in the case of a small light guide plate, the concept of combining the mold structure and various cooling medium flow paths to cool each portion such as a runner has not been known. -4 - 200827796 (2) [Patent Document 1] Japanese Laid-Open Patent Publication No. 2005-349646 (paragraph [0027], Table 1) [Patent Document 2] Japanese Patent Laid-Open Publication No. 2004-161975 (paragraph (0130) to [0133] OBJECTS OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide an injection compression molding method and an injection compression molding die, which can be shortened when a small light guide plate is formed by injection compression molding. Another object is to provide an injection compression molding method and an injection compression molding die for a small light guide plate, which can shorten the molding cycle time of a small light guide plate and form a light guide plate excellent in optical performance. Provided is an injection compression molding method for a small light guide plate, which can shorten the molding cycle time of the small light guide plate and improve the mold release property of the light guide plate with respect to the mold, and the injection compression molding method of the small light guide plate described in claim 1 of the present invention, The diagonal size is 1吋~5吋, and the thickness of the thickest part is 〇. 25mm ~1. An injection compression molding method for a small light guide plate of 0 mm or less, characterized in that a mold cavity having a variable volume and a plate thickness is formed by fixing a cavity forming surface of a mold and a cavity forming surface of a movable mold, and the mold of the fixed mold The hole forming surface and the cavity forming surface of the movable mold are cooled by the cooling medium flow path, and the transfer surface is formed on any one of the cavity forming faces; at least one of the runner bushing or the gate forming surface is by Forming a small light guide plate by using a cooling medium flow path different from the cooling medium flow path of the cavity forming surface; and using the cavity to form a small light guide plate with a cycle time of 1.5 to 6 seconds to 6 seconds. . The injection compression molding method of the small light guide plate according to the present invention has a diagonal size of 1 吋 5 5 吋 and a thickness of the thickest portion 0. 25mm~l. An injection compression molding method for a small light guide plate of 〇mm or less, forming a cavity having a variable volume and a plate thickness by fixing a cavity forming surface of the mold and a cavity forming surface of the movable mold, and forming a cavity forming surface of the fixed mold And the cavity forming surface of the movable mold is cooled by the cooling medium flow path, and one of the cavity forming faces has a transfer surface; at least one of the runner bushing or the gate forming surface is formed by the mold The cooling medium flow path of the hole forming surface is cooled by different cooling medium flow paths; the small light guide plate is formed by the molding cavity with a molding cycle time of 2 · 5 seconds to 6 seconds. Therefore, the molding cycle time can be greatly shortened. [Embodiment] An injection compression molding method for a small light guide plate of the present invention will be described with reference to Figs. 1 to 14 . Fig. 1 is a cross-sectional view showing an injection compression molding die used in the injection compression molding method of the small light guide plate of the embodiment, showing a state in which the mold clamping force 尙 is not applied. Fig. 2 is a cross-sectional view showing an injection compression molding die used in the injection compression molding method of the small light guide plate of the embodiment, showing a state in which the mold clamping force is applied. Fig. 3 is a front view showing a movable mold of an injection compression molding die used in the injection compression molding method of the small light guide plate of the embodiment. Fig. 4 is a front view showing a fixed mold for ejecting a compression molding die used in the injection compression molding method of the small light guide plate of the present embodiment. Fig. 5 is a perspective view of a small light guide plate formed by the injection compression molding method of the small light guide plate of the embodiment -6 - 200827796 (4). Fig. 6 through Fig. 8 are flowcharts showing an injection compression molding method of the small light guide plate of the embodiment. Fig. 9 is an enlarged cross-sectional view showing a sprue bush of a small-sized light guide plate of the present embodiment which is taken out of a compression molding die. Figs. 1 to 14 show the relationship between the runner shape and the molding cycle time of the injection compression molding die of the small light guide plate of the present embodiment. An injection compression molding machine (not shown) is provided with a heating cylinder (with a screw), an injection device for a nozzle, and a mold clamping device, and is disposed on a machine tool. The mold clamping device is provided between a fixed plate fixed to the machine tool (with a fixed mold 13) and a pressure plate disposed on the machine tool, and is provided with four tie bars. A movable disk equipped with a movable mold 12 is movably assembled to the aforementioned tie bar. A clamping cylinder (opening mold and clamping mechanism) for opening and closing the mold and clamping is disposed on the pressure plate, and the punching cylinder of the mold clamping cylinder is fixed to the back surface of the movable plate. In the mold clamping cylinder of the present embodiment, the pressure feed oil is sent to the assist cylinder (the cross-sectional area is small) by the control of the servo valve, so that the movable disk can be closed at a high speed. At the time of mold opening, the pressure feed oil is sent to the mold opening side oil chamber (small cross-sectional area) by the control of the servo valve, and the mold can be opened at a high speed. In this embodiment, the highest specification is that the mold can be opened on the mold closing side.  The mold was opened and closed in 3 seconds. In the opening and closing mold and the mold clamping mechanism of the present embodiment, a mold clamping cylinder controlled by a servo valve is used. However, a toggle mechanism including a servo motor (which is excellent in starting rotation driving speed and stopping speed) and a ball screw can be used. At this time, the aforementioned speed can also be achieved. Further, with respect to the injection device, the injection speed can be between 100 mm/s and 400 mm/s, and can be emitted in 5 seconds. The injection molding die 11 of the small light guide plate of the present embodiment is used for the side light type of a mobile phone having a diagonal size of 2 吋 and a thickness of 〇 6 mm. 200827796 (5) Forming of a light guide plate. The injection compression molding can change the distance between the movable mold 1 2 and the fixed mold 13 during the start of the forming to the end of the forming. Therefore, in the form of "injection molding" in which the molten resin is injected at the closed position and the movable mold is advanced and compressed, the injection molding is also injection compression molding. In the injection compression molding, since the cavity is slightly opened before the start of injection or after the start of injection, it is not necessary to use an injection device having a high-speed injection capability, and can be ejected at a lower speed and a lower pressure. Molten resin. Since the molten resin can be ejected at a lower speed and a lower pressure, internal stress does not occur near the gate. Further, after the start of the injection, the movable mold is moved in the mold clamping direction to compress the molten resin. Therefore, the flow of the molten resin can be accelerated at a position far from the gate portion of the cavity, and the transfer of the fine pattern can be favorably performed. Further, since the mold clamping force is used to compress the molten resin in the cavity, the dwell time can be shortened, and the injection device can be transferred to the measuring step as soon as possible after the pressure is maintained, and the molding cycle time can be shortened. This injection compression molding is particularly suitable for forming a small light guide plate (hereinafter referred to as a light guide plate) having a thin plate thickness (compared to the area of a flat portion). Fig. 1 and Fig. 2 are cross-sectional views of the injection compression molding die 1 of the present invention, which are cross-sectional views taken along line A - A of Figs. 3 and 4, respectively. As shown in the above-mentioned first to fourth figures, the injection compression molding die 1 1 is composed of a movable mold 1 2 of a first mold and a fixed mold 13 of a second mold, and two molds 1 2 after mold clamping. Between 1 and 3, a cavity 1 4 in which the volume and the thickness of the plate can be changed is formed. The mold main body portion 5, the core portion 16 and the movable frame portion 17 are attached to a movable mold 1 2 attached to a movable plate of an injection compression molding machine (not shown). A heat insulating plate 18 is attached to the movable disk side of the mold main body portion 15. The inside is equipped with a -8-200827796 (6). The ejector cylinder 2 1 is provided, and the protruding pin 20 can be moved back and forth through the ejector piece 19. . In the present embodiment, the bite portion 20a having a zigzag cross section is provided at the tip end of the protruding pin 20 so that the light guide plate P (including the gate portion P1 and the runner P2) can be easily held by the protruding pin 20. The jacking cylinder 21 is also actuated by a hydraulic cylinder or a servo motor. A recess 2 2 is formed in the lower four portions of the surface of the mold main body portion 15 on the fixed mold side, and the spring 2 3 is mounted in the recess 22 so as to face the fixed mold side. Further, the fixed mold side of the spring 23 abuts against the support plate 24 (constituting a part of the movable frame portion 17). Further, on the inner side of the concave portion 22 on the side surface of the fixed mold of the mold main body portion 15, guide holes 25 are formed in the upper and lower portions. The guide rod 26 provided from the support plate 24 toward the mold main body portion 15 is inserted into the above-described guide hole 25. Therefore, the movable frame portion 17 (including the support plate 24) disposed in parallel with the mold main body portion 15 is guided by the guide rod 26 and the guide hole 25, and the interval between the two is changed by the spring 32. k The core portion 16 is fixed substantially at the center of the side surface of the fixed mold of the mold main body portion 15. The core portion 16 of the present embodiment has a substantially square shape (having a chamfered portion and a convex portion) similar to the main portion P4 of the light guide plate p. The surface of the core portion 16 opposed to the fixed mold 丨3 is a surface forming surface of the light exit surface constituting the mirror surface forming surface 27 of the mirror surface. Inside the core portion 16, a plurality of cooling medium flow paths 28 which are parallel to the cavity forming surface 27 are formed. In the first and second figures, the core portion 1 is formed of an integral block, but the portion where the cavity forming surface is formed and other portions can be formed of independent blocks. Further, although the cavity forming surface 2 7 discloses an example of a mirror surface, it can also be constructed by performing groove or rough surface processing, etc. -9-200827796 (7). The frame portion 29 is disposed on the surface on the side of the fixed mold of the support plate 24 so as to surround the periphery of the core portion 16. In other words, the core portion 16 is disposed in the hollow portion formed by the movable portion 17 (the support plate 24 and the frame portion 29). By the spring 23, the entire movable frame portion 17 can be moved in the opening and closing direction with respect to the mold main body portion 15 and the core portion 16. Fig. 1 shows the state in which the mold clamping force 尙 is not applied, the movable mold 1 2 when the spring 23 is extended, and Fig. 2 shows the state of the movable mold 12 after the spring 23 is contracted when the mold clamping force acts. As shown in Figs. 1 to 3, the frame portion 29 is composed of four frame portions 30, 3 1 , 3 2, and 3 3 . The first frame body portion 30 and the second frame body portion 3 1 are frames that move in a direction orthogonal to the opening and closing mold direction, and the third frame body portion 3 2 and the fourth frame body portion 3 3 are The frame that is fixed to the support board 24 cannot be moved. The moving mechanism of the first frame portion 30 located above the core portion 16 in Fig. 3 is on the upper surface of the support plate 24 so as to face the fixed mold side.  The cylinder mounting portion 34 is protruded, and the cylinder portions of the two cylinders 35 are fixed to the upper surface of the cylinder mounting portion 34. Further, the rod portions of the respective cylinders 35 are placed downward through the respective holes of the cylinder mounting portion 34, and the respective rod portions are attached to the upper surface of the first frame portion 30. Therefore, the first frame body portion 30 is moved in the direction orthogonal to the opening and closing mold direction by the kinetic energy of the cylinder 35, that is, it can be retracted from the cavity forming position. In the moving mechanism of the second frame portion 31 on the right side of the core portion 16 in Fig. 3, the spring mounting portion 36 is protruded toward the fixed mold side on one side of the fixed mold side of the support plate 24. Inside the spring attachment portion 36, the recesses 3, 7 and 7 are formed on the side of the 10-200827796 (8) side, and the springs 38, 38 are attached to the recesses 37, 37 so as to face the second frame portion 31. The second frame body portion 31 is guided by a guide groove (not shown), and a part of the support plate 24 or the fourth frame body portion 33 constitutes a stopper on the forward side so that it is only in the left-right direction of FIG. Can move a little. The second frame body portion 3 1, is biased by the springs 38, 38 and continues to be in the cavity forming position. The reason why the second frame body portion 3 1 can be moved by a spring is to prevent the movable portion from being caught by the thermal expansion of the mold (particularly, the core portion 16) caused by the molten resin. The third frame portion 3 2 located on the left side of the core portion 16 in Fig. 3 is fixed to a position which is bilaterally symmetrical with the second frame portion 31. In the fourth frame portion 33 located below the core portion 16 in Fig. 3, a gate portion forming surface 39 which is continuous on the lower side of the center of the cavity forming surface 27 is formed. Further, a through hole 40 is formed in a central portion of the gate portion forming surface 39, and the protruding pin 20 for ejector is disposed so as to be movable forward and backward, and the protruding pin of the fourth frame portion 3 3 is further provided. Around the gate 20, a cooling medium flow path 46 is formed in the vicinity of the gate portion forming surface 39. As shown in FIG. 3, among the surfaces of the first frame body portion 30, the second frame body portion 3 1 , the third frame body portion 3 2 , and the fourth frame body portion 3 3 that face the fixed mold 13 , The opposing faces 30a, 31a, 32a, and 33a adjacent to the cavity 14 are processed to be more accurately processed than other portions in order to avoid generation of burrs and to form a small space through which air can flow when the cavity faces are formed by clamping. The flatness is higher. Further, air passages 30b, 3 1 b, and 3 2b are formed on the outer sides of the opposing faces 30 a, 3 1 a, 3 2 a, and 3 3 a so as to surround the cavity 14 and the independent block 43 to be described later. 3 3 b. The outer portion is formed to abut the surface of the fixed mold 13 to -11 - 200827796 Ο). Further, the first frame body portion 30, the second frame body portion 31, the third frame body portion 3, and the fourth frame body portion 3 3 are adjacent to the core portion 16 and are adjacent to the inner side surface of the mold opening and closing direction. The cavity forming faces 30c, 31c, 32c, 33c (for forming the side face P9 of the light guide plate P shown in Fig. 5) are formed. The cavity forming surface 33c includes a surface 3 3 e that forms the gate portion P 1 of the light guide plate P. The cavity forming faces 3 0 c, 3 1 c, 3 2 c, 3 3 c are connected to the inner side of the fixed disk side, and the outer faces of the core portions 16 are opposed to each other with a slight interval to avoid occurrence. Bite. In the cavity forming surface 30c of the first frame body portion 30, the light incident surface forming surface 42 for forming the light incident surface P3 of the light guide plate P is attached to the independent block 43 and the block is bolted. 43 is detachably attached to the other part of the first frame body portion 30. In the present embodiment, the member constituting the cavity of the mold is made of hard stainless steel and has a thermal conductivity of 20 to 24 W/(m • K). In the light guide plate P of the present embodiment, the light incident portion P 5 slightly protruding from the main portion P4 is formed at two places, and the end surface of the light incident portion P 5 is formed by forming a groove (longitudinal groove) P3a in the thickness direction. Light incident surface P3. In the present embodiment, the height difference (depth) between the apex and the valley portion of the groove P3a of the light incident surface P3 is 80 μm. Therefore, the block 43 which forms the light incident surface P3 has the light incident surface forming faces 42, 42 at two places (the grooves which are formed in parallel with the compression direction (opening and closing mold direction) of the cavity 14). Further, the length of the groove forming portion of the light incident surface forming surface 42 of the block 43 in the compression direction is the same as the thickness Ρ6 of the incident light surface Ρ3 of the light guide plate ρ. In other words, the portion -12-200827796 (10) exposed from the cavity forming surface 27 of the core portion 16 is formed into a groove only when the injection compression is completed. Further, when the injection compression is completed, the side faces of the core 邰 16 and the opposite sides of the side faces of the block 430 are formed by planes. The reason is that if the groove is formed on the side of the core portion 16 and the groove is engaged with the groove of the block 43, both of them must require high machining precision; and when the side of the block 43 is completely formed with grooves, the mold When the sides of the core portion 16 are all formed in a plane, burrs may occur in the gap formed between the groove and the plane. Further, in the present embodiment, the light incident surface forming surface 42 is formed of a groove, but may be selected from a bump, a surface on which a plurality of triangular pyramids or a quadrangular pyramid are formed, a rough surface subjected to sandblasting, a curved surface, or the like. A non-planar component other than a plane. As shown in Fig. 3, air passages 44, 45 are formed in the movable mold 12 to attract the air in the cavity 14 before the injection, and to blow the compressed air into the cavity 14 at the time of demolding including the discharge. . The air passages 44, 45 are connected to the vacuum device and the compressed air supply device via respective valve portions (not shown). The air passage 44 communicates with the air passage 30b formed on the opposite surface from the hole 44a of the first frame body portion 30. The air passage 30b communicates with the air passages 3 lb, 32b, 33b which are also formed on the opposite faces. Therefore, the compressed air of the air passages 30b, 31b, 32b, and 33b passes through the opposing faces 30a, 31a, 32a, 33a, and 43a and the opposing faces 53a and the facing faces 5 of the fixed mold 13 which will be described later. The gap formed by the 5 a or the like (the split surface) can be blown into the cavity 14 or sucked from the gap. Further, one of the compressed air portions is blown from the gap formed by the first frame body portion 30 and the block body 4 3 . The air passage 45 formed in the third frame portion 32 communicates with the air passage formed between the core portion 16 and each of the frame portions 30, 31, 3 2, and 3 3 - 200827796 (11) 30d, 31d, 32d, 33d. Therefore, the compressed air of the air passages 30d, 31d, 32d, and 3d passes through the outer side surface of the core portion 16 and the inner side surfaces of the frame portions 3 0 , 31 , 32 , 33 and the light incident surface of the block 43 . The gap formed by the formation surface 42 or the like can be blown into the cavity 14 or sucked from the gap. Therefore, the compressed air can be blown into the cavity 14 from the gap adjacent to the light incident surface forming surface 42. In the present embodiment, the first frame body portion 30 is designed to be retracted outward from the cavity forming position (the position in which the second frame body portion 13 is in contact with the second frame body portion 13 to form a continuous frame around the cavity 14). In order to easily facilitate the release of the light guide plate P from the movable mold 12, the light incident surface P3 of the light guide plate P is prevented from being damaged. In the present embodiment, only the block body 43 having the light incident surface forming surface 42 is detachably attached to the first frame body portion 30, and the block body 43 is replaced to reduce the cost. In the present embodiment, a so-called flat mold in which the frame portion 29 is movable in the mold opening and closing direction with respect to the core portion 16 is used. However, a so-called fitting mold, that is, a mold side mold ( The mold having the concave portion can be in the form of a mold core mold (a mold having a convex portion). Next, the fixed mold 13 will be described. As shown in FIG. 1, FIG. 2, and FIG. 4, the fixed mold 13 includes a mold main body portion 51, a cooling medium flow path forming block 52, a first abutting block 53, and a mold. The hole forming block 54, the second abutting block 55, the sprue bushing 56, and the like. A heat insulating plate 57 is attached to the fixed disk side of the mold main body portion 51, and a hole 58 for inserting an injection device nozzle (not shown) is formed at the center portion, and a positioning ring 59 is attached around the hole 58. Mounted on the movable mold side of the mold main body portion 51: the cooling medium flow path forming block 52 and the sprue bushing 56 are embedded in a block (second abutting block 55). A guide hole 60 through which the guide rod 41 of the movable mold 12 is inserted is provided in the mold main body portion 51. Fig. 9 is an enlarged cross-sectional view of the sprue bushing 56. The inner hole 56b of the sprue bushing 56 is tapered from the injection hole 56a on the nozzle abutting side toward the flow path connecting portion 56c (connected to the flow path portion). Expand the diameter. In the present embodiment, the taper angle (release angle) 0 with respect to the center line L represented by the one-dot chain line is Γ. The cooling medium flow path forming block 52 is formed with a plurality of cooling medium flow paths 61 in a manner parallel to the cavity 14 . The first abutting block 53 is fixed to the movable mold side of the cooling medium flow path forming block 52, and has a facing surface 53a opposed to the first frame portion 30 of the movable mold 12. Further, on the movable mold side of the cooling medium flow path forming block 52 and inside the first abutting block 53, the cavity forming block 54 is fixed by detachment. The surface of the cavity forming block 54 opposed to the movable mold 12 constitutes a cavity forming surface 62 (a reflecting surface (back surface) P8 for forming the light guiding plate P). In the present embodiment, the cavity forming surface 62 is formed. Fine concavo-convex processing is applied to the upper surface. Specifically, it is processed by sand blasting, and the closer to the block 43 side (upper side) of the fixed mold 13, the more unevenness is formed, that is, on the reflecting surface P8, the closer to the light incident surface P3 side, the higher density is formed. Fine bumps. Further, with respect to the cavity forming face 62, a groove can be formed to form a mirror surface. The reason why the detachable block is used as the cavity forming face 62 is that, similarly to the block 43 of the incident face forming face 42, the die forming face 62 can be replaced by the cavity forming block 54. Wear or test the shape of the reflective surface of various light guide plates P. Further, at least one of the cavity forming surface 6 of the fixed mold 13 and the cavity forming surface 27 of the movable mold 12 may be attached to the stamper. It is also possible to form a light exit surface or a reflection surface by forming one of the surfaces 27 and 62 by cavity formation -15-200827796 (13). The opposing surface 55a of the second abutting block 55 and the opposing surface 5 3 a of the first abutting block 53 are the first housing portion 30 and the second housing portion 3 1 of the movable mold 2 The third frame portion 32 and the fourth frame portion 33 are opposed to each other. A cylindrical sprue bushing 56 is disposed inside the second abutting block 55. The side of the fixed disk of the sprue bushing 56 faces the hole 5 of the mold main body portion 51, and the movable mold side faces the protruding pin 20. Between the sprue bushing 56 and the second abutting block 55 on the outer peripheral side thereof, the cooling medium flow path 63 around the sprue bushing 56 for cooling the sprue portion P2 is cooled by the cooling medium flow. Road 6 1 is controlled by a different system, the sides of which are sealed by a 0-ring to form a cold runner (including runner). Further, the inner peripheral surface of the sprue bushing 56 is subjected to rough surface processing by sand blasting to facilitate the demolding of the runner P2. Although the gate portion forming surface of the fixed mold 13 can be cooled by another cooling medium flow path, it is preferable to provide the cooling medium flow path 63 around the sprue bushing 56. Further, an air passage 64 is formed in the cavity forming block 54 to attract the air in the cavity 14 before the ejection, and to blow the compressed air at the time of demolding (including when the pressure is discharged). The air passage 64 is connected to the vacuum suction device and the compressed air supply device via valves (not shown). The air passage 64 communicates with the air passage 64a (formed between the cavity forming block 54 and the first abutting block 53) and the air passage 64b (formed between the cavity forming block 54 and the second abutting block 55) . The compressed air is blown into the cavity 14 from the gap between the cavity forming block 54 and the first abutting block 53 and the second abutting block 55 via the air passages 64a and 64b, and is sucked into the cavity 14 before being ejected. air. By forming the outer edge of the cavity -16 - 200827796 (14) forming block 5 4 to be smaller than the outer shape of the light guide plate P, more compressed air can be blown to the cavity forming surface 62 of the transfer surface. Next, an injection compression molding method using the injection compression molding die 1 of the present embodiment will be described. As described above, the present invention can be realized by a general injection molding method, but an injection compression molding method is preferred. As shown in Fig. 6, in the present embodiment, a diagonal dimension of 2 吋 and a plate thickness of 0 are formed by a molding cycle time of 4 seconds. 6mm light guide plate. Among them, the opening and closing mode time (including the take-out time, the intermediate time) 1_3 5 seconds, the injection time 0. 05 seconds, holding time 0. 4 seconds, cooling time 2. 2 seconds (substantially cooling is done from the beginning of the shot). Therefore, in the present embodiment, cooling of the cooling medium flow path 46 and the fixed mold 13 in the vicinity of the cooling medium flow path 28, the protruding pin 20, and the gate portion forming surface 39 of the core portion 16 of the movable mold 1 2 The cooling medium flow path 61 of the media flow path forming block 52 and the cooling medium flow path 63 in the vicinity of the sprue bushing 56 flow through a cooling medium (cooling water) controlled by a temperature regulator to 100 °C. Further, the temperature of the cooling water is preferably 50 to 110 ° C, preferably 40 to 100 ° C lower than the glass transition temperature Tg (145 ° C to 150 ° C) of the polycarbonate of the molding resin. That is, as shown in Fig. 1, when the temperature of the cooling water flowing through the cooling medium flow path 63 of the sprue bushing 56 is 40 ° C, the sprue bushing 56 is excessive in the molding cycle time of 7 seconds or longer. The problem of mixing the cold block in the molded article occurs by cooling. Further, when the temperature difference between the cavity forming blocks 54 of the fixed mold 13 is too large, in addition to the problem of poor thermal expansion, there is a problem in transfer, and therefore it is not suitable to form at 40 ° C or lower. Further, when the temperature of the cooling water flowing through the cooling medium flow path 63 is 1200 ° C, sprue cutting occurs in the case of the forming cycle time of 4 seconds, -17-200827796 (15), actually at this temperature, Since the sprue cutoff may occur, it makes no sense to form at this temperature. Further, in the conventional light guide plate forming mold, cooling is not performed in the vicinity of the gate P1 or in the vicinity of the runner P2. However, in the present embodiment, the gate portion P2 and the runner portion P2 are cooled at substantially the same temperature as the cavity forming surfaces 27 and 62. Further, in the present invention, the gate portion P1 and the runner portion P2 have a temperature difference of -60 ° C to +20 ° C with respect to the cavity forming faces 27 and 62 to ensure the fluidity of the molten resin at the time of injection, and The plate thickness difference between the gate P1 1 of the light guide plate P and the gate distal portion P 1 2 is reduced, and the molding cycle time is shortened. When the cooling temperature of the gate P1 is lower than the cooling temperature of the cavity forming faces 27, 62 by more than -60 ° C, the flow of the resin at the time of ejection deteriorates, which hinders the injection of the cavity 14 . As described above, the thickness of the plate P 1 1 in the vicinity of the gate portion of the light guide plate p and the gate distal portion P 1 2 are different. With respect to the cooling temperature of the cavity forming surface, when the cooling temperature of the gate portion forming surface 39 and the sprue bushing 56 exceeds +20 ° C, the cooling hardening % of the runner portion P2 becomes slow, when the movable mold 12 performs When the sprue portion P2 is pulled out from the sprue bushing 56 after the mold opening, the sprue portion P2 may be cut off, resulting in an increase in the forming cycle time. Further, the cooling temperature of the gate portion forming surface 39 and the sprue bushing 56 is preferably lower than the cooling temperature of the cavity forming surface. In the present invention, in addition to the cavity forming faces 27, 62, at least one of the sprue bushing 56 of the fixed mold 13 and the gate portion forming surface 39 of the movable die 12 is formed by the cooling medium flow path 28, 6 1 The cooling medium flow path 63' 46 of the different systems is cooled to ensure the resin flowability of the gate portion P1. However, when the runner bushing and the gate portion forming surface are not provided with a separate cooling medium flow path, the same as the case where the gate -18-200827796 (16) portion forming surface and the sprue bushing have a too high cooling temperature. This will cause the molding cycle time to be prolonged; and when the cooling temperature of the entire mold is lowered, the transfer of the cavity forming surface will be insufficient. Further, the temperature of the cooling medium flow path of the fixed mold 13 and the cooling medium flow path 28 of the movable mold 12 may be changed to adjust the bending and birefringence of the light guide plate P and the like. Further, it is also possible to provide a gate cutter which can move forward and backward in the movable mold, and perform gate cutting before the mold opening to separate the small light guide plate P from the gate portion P1. Further, the temperature in the front region (the region closest to the nozzle) of the injection device was set to 310 ° C, and the measurement of the molten resin of the polycarbonate was carried out. In the case of using polycarbonate, the temperature of the front portion of the injection device is preferably set to be 300 to 3 80 °C. Then, the mold clamping device (not shown) is actuated to bring the movable mold 12 (the state shown in Fig. 1) attached to the movable disk into contact with the fixed mold 13 attached to the fixed disk. At this time, the frame-shaped portion formed by the first abutting block 53 and the second abutting block 55 of the fixed mold 13 is the first frame portion 30 and the second frame portion 31 of the movable mold 12. The frame body portion 29 composed of the third frame body portion 3 and the fourth frame body portion 33 is in contact with each other, and a cavity 14 including a gate portion forming surface 39 (connected to the runner portion 2) is formed therein. Upon formation of the cavity 14, the valve is opened to communicate the air passages 44, 45, 64 to the vacuum suction means and to attract air within the cavity 14. Further, in the present embodiment, in order to shorten the molding cycle time, the nozzle of the injection device (not shown) is continuously abutted against the sprue bushing 56. The mold clamping force before the start of the injection after the mold is abutted must be the mold force that abuts the mold main body portion 15 of the movable mold 12 and the support plate 24 of the movable frame portion 17 against the elastic pressure of the spring 23, in this embodiment. The form is 5 〇 -19- 200827796 (17) The part can be 13 隔 14 宽 宽 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 As shown in Fig. 2, the support plate 24 is brought into contact with the mold body 15 at this time, and the frame portion 29 is positioned at the final retracted position with respect to the core portion 16 and then passed through the sprue bushing from the nozzle of the injection device (not shown). 5 6 The molten resin was injected at an injection speed of 100 00 mm/SeC. The mold main body portion 15 and the core portion 16 of the movable plate and the movable mold 12 are again retracted to the position shown in Fig. 1 by the pressure at the time of injection. Thereby, the movable frame portion 17 of the movable mold 12 is positioned forward with respect to the core portion 16, and the cavity 14 is widened between the cavity forming surface 62 of the fixed mold and the cavity forming surface 27 of the movable mold 12. It is possible to eject the molten resin. At this time, the thickness of the cavity is increased by about 50 to 200 μm compared to the position at which the mold clamping force shown in Fig. 2 is applied. When the screw position reaches the predetermined pressure holding switching position by the injection device, the injection control is switched to the pressure holding control. The mold clamping force is reduced to 20 to 50 kN before or at the same time as the pressure holding switch is performed. Next, the cavity forming surface 27 of the movable mold is moved toward the fixed mold side, and the molten resin in the cavity 14 (hardened from the side of the cavity forming faces 27, 62) is compressed. The amount of movement ' with respect to the mold opening direction is compressed by a movement of 1/3 to the same amount. In the present embodiment, the molten resin is compressed by the movement of the movable mold 12, so that the grooves and the bumps can be transferred better than the usual injection molding. In the present embodiment, the valve connecting the air passages 44, 45, and 64 is opened before the start of the mold opening (before the pressure discharge). The compressed air from the unillustrated source is supplied to the air passages 44, 45, 64 and the air. The passages 3 0b, 3, 32b, 33b, 64a, 64b, etc. supply compressed air. After passing the clamping time of -20-200827796 (18), the pressure is released from the mold clamping device. The air from each of the air passages 64, 64a, 64b acts between the light guide plate p and the cavity forming surface via the pressure discharge, and facilitates the mold release of the light guide plate P with respect to the movable mold 1 2 by clamping The device moves the movable plate and the movable mold 12 in the mold opening direction. At this time, the light guide plate P formed in the cavity 14 is easily cut from the sprue bushing 56 by the rough surface processing of the inner surface of the sprue bushing 56 and the front end processing of the protruding pin 20. Further, the mold is designed such that the sprue portion P2 is not cut in the sprue bushing 56. Therefore, even if the temperature of the cooling medium flowing through the cooling medium flow path 46 in the vicinity of the gate portion P1 of the runner portion P2 or the cooling medium flow path 63 in the vicinity of the runner portion P2 is relatively high, no problem occurs. Further, on the side of the movable mold 12, the compressed air filled in the air passages 44 and 45 is sprayed to the outside through the gap between the cavity forming surfaces 30c, 31c, 32c, 33c, and 33e and the side surface P9 after the mold is opened. To promote the release of the light guide plate P. Further, when the mold is opened at the same time C or later, air is supplied to the rod side chamber of the cylinder 35 of the moving mechanism, and the first frame portion 30 including the block 43 is outward (Fig. 1 to Fig. 3). Moving upward, leaving it away from the portion of the light guide plate P that includes the light incident surface P3. Then, the runner portion P2 is gripped by the grip portion of the unloader shown in the drawing, and the ejector cylinder 21 is actuated to project the projecting pin 20, and the back side of the runner portion P2 is pushed forward to allow the light guide plate P to be poured. The mouth portion P1 and the runner portion P2) are completely released from the movable mold 1 2, taken out, and moved to another loading position. -21 - 200827796 (19) When the light guide plate p is taken out from the movable mold 1 2, the next molding is performed, and the molding cycle time of the present embodiment is only 4 seconds. It takes 1 〇 seconds compared to the conventional molding cycle time of the light guide plate. 'In terms of time, it can be greatly shortened. The reason for this includes that the cavity forming surface 62 of the fixed mold 13 , the sprue bushing 56 , the cavity forming surface 27 of the movable mold 12 , and the gate forming surface 39 are respectively cooled by a cooling medium, and The pressure holding time and the like are shortened by performing injection compression molding. Further, by molding one mold once in a single pass, one sheet of the light guide plate P is simultaneously formed, and it is not necessary to consider the uniform charge of the resin as in the case of forming a plurality of light guide plates simultaneously by forming a plurality of molds one time. For example, it is only necessary to pursue the molding conditions of one light guide plate, so that defective products hardly occur. In the present embodiment, the diagonal dimension is 2 吋 and the plate thickness is 0. 6mm light guide plate P; the present invention, for a diagonal size of 1 吋 to 5 吋 (converted to an area including 75 cm 2 or less, also included in the four ridges without a corner but within the aforementioned area), uniform thickness, 〇. 25mm~1. The 0 mm light guide plate P can be formed by a forming cycle time of 2.5 seconds to 6 seconds. In the forming cycle time of 2.5 seconds, as shown in the flow chart of the injection compression molding method of the small light guide plate of Fig. 7, the opening and closing mode time (the take-out time, the intermediate time, and the injection delay time (including the pressurization time)) is 0. 85 seconds, shooting time 0. 05 seconds, holding time 0. 4 seconds, cooling time 1 · 2 seconds. As long as the size of the small light guide plate is within this range, the molding cycle time will not be greatly affected. However, if the molding cycle time is further shortened, the cooling time will be insufficient, and the thickest runner portion 2 will be insufficiently hardened. If the sprue section 2 cannot be removed, the sprue cutoff will occur. -22- 200827796 (20) As described above, the most influential factor determining the cooling time in the molding cycle time of the present invention is the diameter and taper angle of the runner portion P2 as shown in Fig. 9 (released) Tilt angle) 0. In the present embodiment, the diameter of the nozzle hole (not shown) of the nozzle of the injection device is 1. 5mm. When the sprue is demolded, in order to remove the resin at the tip end of the nozzle well, the diameter of the injection hole 56a on the nozzle hole side of the sprue bushing 56 must be larger than the diameter of the nozzle hole, and it is preferable to form 1. Injection hole of 6mm or more. Figures 10 to 14 show that the use of two light guide plates P can be taken out (diagonal size 2. 8吋, plate thickness 0. The test results of the injection compression molding die of the small light guide plate P of 4 mm) were tested under the following conditions: the cooling water temperature of the cooling medium passages 28, 61 for cooling the cavity forming faces 27, 62 was 90 ° C each, and the nozzle temperature 3 25 °C, the front temperature of the heating cylinder is 3 5 5 °C, the middle temperature of the heating cylinder is 3 70 °C, the temperature of the rear part of the heating cylinder is 3 60 °C, and the injection speed is 300 mm/sec. Figure 10 shows the diameter of the injection hole 56a using 1. In the 6mm and ninth figures, the data of the sprue bushing 56 with a taper angle 0 of 1° and a length of 25 mm is shown. In this example, when the cooling temperature of the sprue bushing 56 is 70 ° C or 80 ° C, the injection hole 56a of the sprue bushing 56 and the nozzle of the nozzle are formed when the forming cycle time becomes longer (5 seconds or more). When the pores are excessively cooled, there is a problem in that the next shot cannot be performed, and the cold block is mixed in the molded article. When the cooling temperature of the sprue bushing 56 is 90 ° C, defects may occur even when it is 6 seconds or longer. Therefore, the diameter of the injection hole 56a of the sprue bushing 56 is 1. At 6mm, the practical range becomes extremely narrow, and when the number is smaller, it will not be able to perform practical setting adjustments. Figure 11 shows the diameter of the injection hole 56a. 0mm, 9th -23-200827796 (21) The data shown in the figure is 0 when the taper angle 0 is 1° and the length is 25 mm. In this example, in the case of each cooling temperature, when the molding cycle time is 2 seconds, the cooling of the runner P1 may not be followed, and the runner may be cut, but the results are good. However, when the forming cycle time exceeds a certain level, the economy is not good. Further, when the molding cycle time is excessively extended, the nozzle is cooled to deteriorate the fluidity of the molten resin, and the residence time of the molten resin in the heating cylinder is too long to cause deterioration of the resin (yellowing, black spots). Regarding the temperature of the cooling water, in the case of 40 t, since the cold block is mixed in the molded article, the cooling temperature for forming is preferably 50 ° C or higher. Also, at 10 ° C, the runner is cut off at 4 seconds, so the cooling temperature for forming is preferably 1 1 〇 ° C or less. Figure 12 shows the diameter of the injection hole 56a. The data of the runner bushing 56 having a cone angle 0 of 1° and a length of 25 mm shown in Fig. 9 is shown in Fig. 9. In this case, when the cooling temperature is 70 °C, sprue cutting occurs at a molding cycle time of 3 seconds, and occurs at a cooling temperature of 80 ° C and 90 ° C at a molding cycle time of 5 seconds. The sprue is cut. Fig. 13 shows the data obtained when the diameter of the injection hole 5 6 a is 2 · 6 m m and the taper angle 0 shown in Fig. 9 is the sprue bushing 56 of Γ and length 25 mm. In this example, the diameter of the flow path connecting portion 56c is 3. 47mm, this part of the cooling hardening is time consuming. In this case, when the cooling temperature is 70 °C, sprue cutting and wire drawing occur at a molding cycle time of 5 seconds, at a cooling temperature of 80 ° C, 90 ° C, and a forming cycle time of 6 seconds. A bypass cut will also occur. Therefore, when the diameter of the injection hole 5 6 a is 2. In the case of 6 mm, in order to achieve the ideal forming cycle time within 6 seconds, it can be -24-200827796 (22) is the upper limit diameter. Figure 14 shows the diameter of the injection hole 56a. 6mm, 2. 0mm, 2. 3mm, 2. 6mm, cone angle 0 is 1. When the sprue bushing 56 of 5° and 25 mm was used, the test data was carried out at a cooling temperature of 70 °C. In this example, the diameters of the flow path connecting portions 56c are respectively formed corresponding to the size of the injection holes. 9mm, 3. 3mm, 3. 6mm, 3. 9mm, the thickening of the hardening of the thick part is particularly slow. In the diameter of note 56a 2. 6mm, the runner connection portion 64c has a diameter of 3. 9mm, cone is 1. In the case of 5°, in the case where the cooling temperature is 70 ° C, the runner is cut off at the time of the molding cycle for 5 seconds, and the run length of the runner occurs at 6 seconds, so that it is judged to be inconsistent with practical use. Further, regarding the size of the other injection hole 516a, the taper angle 0 of the inner hole 56b of the sprue bushing 56 is a factory shape, and it is improved if the shortest molding cycle time is not extended. Therefore, in the case where the molding cycle time is limited to 6 seconds, the runner connection 56c having the slowest sprue bushing 56 (having the inner hole 56b) has a diameter of 3. 6mm, the largest diameter in the practical range. The preferred taper angle 0 of the inner hole 5 6b of the sprue bushing 56 is preferably 0·5~2 from the hole 5 6a toward the flow path connecting portion 56c. 0° expansion. However, the diameter of the land connecting portion 56c exceeds 3. At 6mm, even for 6 seconds during the forming cycle (cooling time 3. 9 seconds), the cooling in the vicinity of the flow path connecting portion 56c is still too slow, and the sprue portion P2 may be cut off during mold opening. When the P2 remains in the sprue bushing 56, in addition to having to interrupt the continuous manufacturing, the skilled worker must work in a small space to take out the pour P2, which may cause mold damage. When the small diameter of the sprue bushing 56 is not the length, the above-mentioned maximum inlet angle 0 time or the curved diameter is not cooled, and the direct injection is between the flow and the hardening is performed. -25-2727796 (23) The wall thickness of the cooling medium flow path 6 3 is set to 5 6 d: right. In the present invention, as shown in the flowchart of FIG. 3, the thickness is 0. 6mm (uniform plate thickness) has a transfer energy with a forming cycle time of 6. The cooling time for injection compression at 0 seconds is 3 · 9 seconds. When the formed light guide plate is large, the molding cycle time tends to be longer. However, if it is more time-consuming, in addition to economical problems, for example, the nozzle may be cooled, and the resin in the heating cylinder may be inferior in the eighth drawing. The small light guide plate is injection-molded and formed into a sprue bushing 56 of the same embodiment. The formed light guide plate 精 is finished by finishing the gate portion Ρ, and is assembled as a side light type light guide plate in the light guide plate 成形 formed by the application form, and the thickness Ρ6 of the portion Ρ12 near the gate is ΙΟμχη The average brightness of each part when the test was performed after combining the LEDs of the good board and the light source, and the light exit surface 9 was equally divided, and showed good results. The present invention has not been enumerated one by one, but it is not a matter of course, and it is of course also included by those skilled in the art in accordance with the present invention. In the present embodiment, a small light guide plate (1 吋 to 5 吋, plate thickness 0.) for explaining the injection compression molding die of the light guide plate for the diagonal size is described. 2 5 mm〜 In the example described in the present embodiment, the light guide plate having a diagonal size pattern is formed in a shape of 15 to 30 mm left, and the area and the thickness of the sheet are increased. 9~1 0 second time and other issues. In addition, the method is also used to cut off the rear display device. The real P 1 1 and the gate far away. It will be described as a mobile phone that is uniform and consistent with the goal and is limited to the gist of the above-mentioned implementation. However, it can also manufacture other 1. 0mm). It is possible to simultaneously form an injection compression molding die (one piece for one molding) of a light guide plate for a mobile phone of 1 -26-200827796 (24), but it is also applicable to, for example, a case where two light guide plates are simultaneously formed. Further, in the present embodiment, the injection compression molding die mounted on the injection compression molding machine that opens and closes the mold in the horizontal direction will be described. However, the present invention can also be applied to the opening and closing of the mold in the vertical direction. The light guide plate P of this embodiment has a thick plate thickness.  6mm and injection compression molding method, but the thickness is 0. 25~0. In the case of about 5 mm, the injection molding method in injection compression molding can be used. According to the injection molding method, since the interval of the cavity is wide at the closed position, even if the thickness is extremely thin, the injection can be performed at a lower speed and a lower pressure, and the movable mold advances and compresses after the injection. At this time, the clamping speed should be high speed. For example, the thickness of the light guide plate is 0. 25~0. In the case of 5 mm, if the interval between the cavities is further widened before reaching the 50% to 100% plate thickness, the filling of the molten resin becomes easier and the plate thickness becomes more uniform. When the thickness of the plate is thin, the gate portion can be widened. A flow chart of the injection molding method of the small light guide plate shown in Fig. 5 is (4. The forming cycle time of 2 seconds formed a diagonal size of 3 吋 and a plate thickness of 0. 3 mm (uniform plate thickness) light guide plate with transfer pattern. The cooling time at this time is 2. 2 seconds. Further, although the resin used for the molding is only an example of a polycarbonate (for example, Duffon LC 1 500), it is preferable that the resin is excellent in optical performance, and for example, a methacrylic resin or a cycloolefin polymer can be used. Resin and so on. The glass transition temperature of the methacrylic resin is 90 ° C, and when the methacrylic resin is used, the cooling medium temperature is preferably 40 to 80 °C. The temperature of the molten resin and the glass transition temperature vary depending on the type of resin. Of course, the temperature of the cooling medium, the molding cycle time, and the like may vary. Further, the range of the light guide plate of the present invention includes a light-transmitting resin plate such as a light diffusing plate. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing an injection compression molding die used in the injection compression molding method of the small light guide plate of the embodiment, showing a state in which the mold clamping force 尙 is not applied. Fig. 2 is a cross-sectional view showing an injection compression molding die used in the injection compression molding method of the small light guide plate of the embodiment, showing a state after the mold clamping force is applied. Fig. 3 is a front view showing a movable mold of an injection compression molding die used in the method of injection compression molding of the small light guide plate of the embodiment. Fig. 4 is a front view of a fixed mold for injection compression molding die used in the injection compression molding method of the small light guide plate of the embodiment. Fig. 5 is a view showing the injection compression molding method of the small light guide plate of the embodiment. Stereoscopic view of a small light guide plate Fig. 6 is a flow chart showing a method of injection compression molding of the small light guide plate of the present embodiment. — Fig. 7 is a flow chart showing a method of injection compression molding of a small light guide plate of another embodiment. Fig. 8 is a flow chart showing an injection compression molding method of a small light guide plate of another embodiment. Fig. 9 is an enlarged cross-sectional view showing the sprue bush of the small-sized light guide plate of the present embodiment which is compressed and compressed into a -28-200827796 (26) mold. Fig. 1 is a view showing the relationship between the shape of the runner of the injection-molding mold of the small-sized light guide plate of the present embodiment and the molding cycle time. Fig. 11 is a view showing the relationship between the runner shape of the injection compression molding die of the small light guide plate of the present embodiment and the molding cycle time. Fig. 1 is a view showing the relationship between the runner shape of the injection compression molding die of the small light guide plate of the present embodiment and the molding cycle time. Fig. 13 is a view showing the relationship between the runner shape of the injection compression molding die of the small light guide plate of the present embodiment and the molding cycle time. Fig. i4 is a view showing the relationship between the runner shape and the molding cycle time of the injection compression molding die of the small light guide plate of the embodiment. Fig. 15 is a flow chart showing a method of injection molding of a small light guide plate of another embodiment. [Explanation of main component symbols] 1 1 : Injection compression molding die 1 2 : Movable die 1 3 : Fixed die 1 4 : Mold hole 1 5, 5 1 : Mold main body portion 1 6 : Core portion 1 7 : movable frame portion 27 , 30c, 31c, 32c, 33c, 62: cavity forming faces 28, 46, 61, 63: cooling medium flow path -29 - 200827796 (27) 3 0 : first frame body 3 1 : second frame body 3 2 : third frame body portion 3 3 : fourth frame body portions 30 a , 31 a , 32 a , 33 a , 43 a , 53 a , 55 a : opposite surface 42 : light incident surface forming surface 43 : blocks 30 b , 30 d , 31 b , 31d, 32b, 32d, 33b, 33d, 44, 45, 64, 64a, 64b: air passage 5 3 : first abutment block 54 : cavity forming block 5 5 : second abutment block 56 : sprue bushing P: light guide plate P 3 : light incident surface P3a: groove P8: reflective surface P 1 〇: light exit surface -30-

Claims (1)

  1. 200827796 (1) X. Patent application scope 1 · An injection compression molding method for a small light guide plate, which is an injection compression of a small light guide plate having a diagonal size of 1 吋 to 5 吋 and a thickness of 0.25 mm to 1.0 mm or less. The forming method is characterized in that: a cavity having a variable volume and a plate thickness is formed by fixing a cavity forming surface of the mold and a cavity forming surface of the movable mold, and a transfer surface is formed on one of the cavity forming faces, the fixing The cavity forming surface of the mold and the cavity forming surface of the movable mold are cooled by the cooling medium flow path, and at least one of the runner bushing or the gate forming surface is cooled by the cooling medium flow formed by the cavity The different cooling medium flow paths are cooled, and the small-sized light guide plate is formed by the molding cavity at a molding cycle time of 2 _ 5 seconds to 6 seconds. 2. The injection compression molding method for a small light guide plate according to claim 1, wherein the resin-based polycarbonate used in the injection compression molding method of the small light guide plate is used to cool the sprue bushing or gate. The temperature of the cooling medium flowing through the cooling medium flow path of at least one of the portion forming surfaces is 50 ° C to 1 10 ° C 〇 3 . The injection compression molding of the small light guide plate of claim 1 or 2 In the method, the resin-based polycarbonate used in the injection compression molding method of the small light guide plate is melted in a region before the injection device having a temperature of 300 to 380 °C. 4. The small-sized light guide plate of any one of the above-mentioned claims, the third embodiment of the present invention, the injection molding compression method, wherein the fixed mold and the movable mold are used before or during demolding. The compressed air is applied to the formed light guide plate. 5. The injection compression molding method of a small light guide plate according to any one of claims 1 to 4, wherein one of the cavities corresponding to one runner (connected to the injection device) is formed one time. The formation of the aforementioned small light guide plate is performed in the mold. 6. An injection compression molding die for a small light guide plate, which is an injection compression molding die of a small light guide plate having a diagonal size of 1 吋 to 5 吋 and a thickness of 0.25 mm to 1.0 mm or less of the thickest portion, characterized in that: Forming a cavity having a variable volume and a plate thickness from a cavity forming surface of the fixed mold and a cavity forming surface of the movable mold, and having a transfer surface on the forming surface of the mold cavity, the cavity forming surface of the fixed mold and the movable surface The cavity forming surface of the mold is cooled by the cooling medium flow path, and the runner bushing and the gate portion forming surface are cooled by a cooling medium flow path different from the cooling medium flow path of the cavity forming surface. 7. The injection molding compression molding die of the small light guide plate of claim 6 wherein the compressed air is applied to the formed light guide plate from the fixed mold and the movable mold before or during demolding. 8. The injection compression molding die of the small light guide plate of the sixth or seventh aspect of the patent application, wherein the mold is formed in one mold in which one cavity corresponds to one runner (connected to the injection device) The formation of the aforementioned small light guide plate. A small light guide plate formed by an injection compression molding method of a small light guide plate according to any one of the above-mentioned claims 1 to 32-200827796 (3). -33-
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JP2007185122A JP4044608B1 (en) 2006-12-19 2007-07-16 Injection compaction method for small light guide plate and small light guide plate

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Publication number Priority date Publication date Assignee Title
TWI419783B (en) * 2009-08-31 2013-12-21 Hon Hai Prec Ind Co Ltd Molding die for light guide plate

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JP5105613B2 (en) * 2008-08-06 2012-12-26 株式会社名機製作所 Injection compression mold
CN102672921B (en) * 2012-01-16 2014-05-07 北京中拓机械有限责任公司 Molding method of hollow products made of thermoplastic resin
CN102854561B (en) * 2012-09-14 2015-02-11 京东方科技集团股份有限公司 Light guide plate and preparation and application thereof
TWI527678B (en) * 2013-06-28 2016-04-01 緯創資通股份有限公司 Injection molding module and injection molding method thereof
CN106626257B (en) * 2016-12-30 2018-09-11 永平县建达鑫鑫合金铸造有限公司 Based on the casting mold for improving cooling efficiency

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CN2130671Y (en) * 1992-06-22 1993-04-28 叶子鸿 Vacuum venting mould structure
CN1473696A (en) * 2003-08-11 2004-02-11 卢能晓 Compressed air demolding method for injection mold and its mold structure
JP4087818B2 (en) * 2004-06-09 2008-05-21 株式会社日本製鋼所 Method for forming thick light guide plate

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Publication number Priority date Publication date Assignee Title
TWI419783B (en) * 2009-08-31 2013-12-21 Hon Hai Prec Ind Co Ltd Molding die for light guide plate

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