JP5457664B2 - Hot press molding apparatus and viscous cartridge - Google Patents

Description

  The present invention relates to a hot press molding apparatus and a viscous cartridge.

  Conventionally, a hot press molding apparatus (hereinafter referred to as a molding apparatus) for thermally transferring a fine shape pattern (uneven pattern) with a height of several μm to several tens of μm on a substrate such as a light guide plate for a liquid crystal display is known. (For example, refer to Patent Document 1). The molding apparatus of Patent Document 1 includes a mold apparatus having an upper mold part and a lower mold part. Each mold part includes a temperature control plate and transfer means provided on the opposite surface side of each temperature control plate and having a fine shape pattern on the surface. A substrate is placed on the transfer means of the lower mold part. Such a molding apparatus disclosed in Patent Document 1 heats the transfer means to the base material by pressing the transfer means onto the base material after the transfer means is heated to a temperature equal to or higher than the softening temperature of the base material by the temperature control plate. To do. And a shape pattern is fixed to a base material by cooling a base material to below softening temperature via a transfer means with a temperature control plate.

JP 2004-74769 A

  However, in such a molding apparatus, there is a variation of about 0.1 mm in the flatness of the base material, and there is also a variation of about 0.01 to 0.05 mm in the dimensions of the mold apparatus and the flatness of the transfer means. . Further, the temperature control plate is warped due to thermal distortion during heating and cooling.

  For this reason, in such a molding apparatus, there is a problem that unevenness occurs in the distribution of the contact surface pressure that the substrate receives from the transfer means during press molding, and the shape pattern may not be thermally transferred to a portion where the contact surface pressure is low. In addition, when the substrate is very thin as 1 mm or less, if unevenness occurs in the distribution of contact surface pressure, a partial difference occurs in the amount of compressive deformation in the thickness direction and the amount of extension in the surface direction of the substrate, There is also a problem that warpage and undulation may occur in the substrate.

For these problems, for example, a pressing force higher than the pressure required for thermal transfer is applied to the base material, the heating temperature for the transfer means is increased, and the surface pressure required for the thermal transfer is lowered, and the press to the base material for the transfer means Measures such as lowering the surface pressure required for thermal transfer by increasing the time and enlarging the softened layer of the substrate can be considered.
However, these measures are not desirable in terms of equipment cost, running cost, and production time, but also add more temperature and surface pressure than necessary to the base material, and the side surface of the base material swells during pressing, Post-processing of the swollen side is required. Moreover, when a base material is thin, curvature and a wave | undulation will be increased.

  An object of the present invention is to provide a hot press molding device and a viscous cartridge capable of making the distribution of contact surface pressure received by a substrate uniform.

A hot press molding apparatus according to claim 1 of the present invention includes a bolster, a press apparatus that is provided above the bolster and has a slide that moves close to and away from the bolster, and a base material mounted on the bolster. A lower mold part to be placed, and a mold apparatus having an upper mold part provided on the slide, wherein at least one of the lower mold part and the upper mold part is the bolster or the A bottom plate fixed with respect to the slide, a frame shape, the bottom plate being installed in the opening, and a frame body slidably movable in the vertical direction, and fixed to the frame body The opening is closed, and has a predetermined shape pattern on the surface, and is surrounded by transfer means for thermally transferring the shape pattern to the base material, the bottom plate, the frame body, and the transfer means. And a provided Description space viscous body, the outer edge of the viscous body provided in the accommodating space is greater than the outer edge of the substrate, outside of the substrate, the thickness of the base equal spacer having a thickness is disposed, the inner edge of the spacer is disposed through the outer edge and a small gap of the substrate, the outer edge of the spacer, that you have placed outside the outer edge of the viscous body Features.

  A hot press molding apparatus according to a second aspect of the present invention is the hot press molding apparatus according to the first aspect, comprising a viscous body cartridge housed in the housing space, wherein the viscous body cartridge comprises two thin plates. And an elastic frame member provided between the thin plates, and the viscous body provided in a space surrounded by the thin plates and the elastic frame member.

The hot press molding apparatus according to claim 3 of the present invention is the hot press molding apparatus according to claim 1 or 2 , wherein the transfer means is fixed to the frame and closes the opening. And a hot press molding apparatus comprising a stamper having the shape pattern on the surface.

The hot press molding apparatus according to claim 4 of the present invention is the hot press molding apparatus according to any one of claims 1 to 3 , wherein the transfer means is fixed to the frame body and the opening portion. It is comprised from the top plate which obstruct | occludes, and the stamper which is provided on the said top plate and has the said shape pattern on the surface.

According to a fifth aspect of the present invention, there is provided a hot press molding apparatus comprising: a bolster; a press apparatus provided above the bolster and having a slide that is close to and separated from the bolster; and a substrate mounted on the bolster. A lower mold part to be placed, and a mold apparatus having an upper mold part provided on the slide, wherein at least one of the lower mold part and the upper mold part is the bolster or the A bottom plate fixed with respect to the slide, a frame shape, the bottom plate being installed in the opening, and a frame body slidably movable in the vertical direction, and fixed to the frame body The opening is closed, and has a predetermined shape pattern on the surface, and is surrounded by a stamper that thermally transfers the shape pattern to the substrate, the bottom plate, the frame body, and the stamper. An elastic body provided in the housing space, and an outer edge of the elastic body provided in the housing space is larger than an outer edge of the base material, and the thickness of the base material is outside the base material. equal spacer having a thickness is disposed, the inner edge of the spacer is disposed through the outer edge and a small gap of the substrate, the outer edge of the spacer, that you have placed outside the outer edge of the elastic member Features.

A viscous cartridge according to a sixth aspect of the present invention is provided on the back side of a transfer means of a heat press molding apparatus for thermally transferring a predetermined shape pattern to a substrate, and is provided between two thin plates and the thin plate. An elastic frame member; and a viscous body provided in a space surrounded by the thin plate and the elastic frame member. The elastic frame member seals the viscous body and is thicker than the viscous body. an elastic frame member, provided on the outside of the first elastic frame member has a hardness greater than the first resilient frame member, and a Rukoto a same thickness second elastic frame members and said viscous material Features.

A viscous cartridge according to a seventh aspect of the present invention is the viscous cartridge according to the sixth aspect , wherein the viscous body is made of gel-like or grease-like silicone.

The viscous cartridge according to an eighth aspect of the present invention is the viscous cartridge according to the sixth aspect , wherein the viscous body is formed of a low melting point metal having a melting point lower than the softening temperature of the base material. Features.

According to the first aspect of the present invention, the frame body slides to the bottom plate side with the pressing of the base material. As the frame moves, the viscous body is compressed by the transfer means, and an equal pressure is generated inside the viscous body, so that each part of the transfer means can be pressed against the base material with equal force by the viscous body. . Therefore, it is possible to make the distribution of the contact surface pressure that the substrate receives from the transfer means uniform without applying an unnecessarily high temperature or surface pressure to the substrate.
And since the outer edge of a viscous body is larger than the outer edge of a base material in planar view, the viscous body can press each part of a transfer means to the whole surface of a base material with equal force. Therefore, the shape pattern of the transfer means can be transferred to the entire surface of the substrate.
In addition, the outer edge of the viscous material is larger than the outer edge of the base material, but since the portion protruding from the outer edge of the base material of the transfer means can be pressed by the spacer, the portion is pushed up by the transfer means and plastically deformed. Can be prevented.

Here, when a viscous body is provided directly in the housing space formed in the frame body, it is necessary to wipe off the viscous body adhering to the inner wall of the frame body, the back surface of the transfer means, etc. when replacing the viscous body. Therefore, there is a problem that it takes time to exchange.
However, according to the invention of claim 2, since the viscous body is accommodated in the viscous body cartridge, the viscous body can be replaced by replacing the viscous body cartridge, and the replacement of the viscous body is facilitated. be able to.

Here, when the outer edge of the viscous body is larger than the outer edge of the base material in plan view, in the transfer means, if the portion corresponding to the portion protruding from the outer edge of the base material of the viscous body is not pressed by the spacer, the corresponding portion is the viscous body. There is a possibility that it will be pushed up and plastically deformed. Therefore, since a spacer is required, there is a problem that the number of parts increases.
However, if the outer edge of the viscous body is made smaller than the outer edge of the substrate , the viscous body will not jump out of the outer edge of the substrate. Therefore, a spacer can be dispensed with and the number of parts can be reduced.

According to the third aspect of the present invention, since the transfer means is composed of a stamper, the number of parts can be reduced as compared with the case where the transfer means is composed of a stamper and a top plate.

According to the invention of claim 4 , since the top plate is arranged between the stamper and the viscous body, the top plate suppresses the pressure from the viscous body applied to the stamper base material and the portion not pressed by the spacer. be able to. Therefore, it is possible to reliably prevent the portion from being plastically deformed.

According to the invention of claim 5 , the frame body slides to the bottom plate side with the pressing of the base material. As the frame moves, the elastic body is compressed by the transfer means, and an equal pressure is generated inside the elastic body, so that each part of the stamper can be pressed against the base member with an equal force by the elastic body. Therefore, the contact surface pressure distribution received by the base material from the stamper can be made uniform without applying unnecessary temperature or surface pressure to the base material.
Further, the elastic body is formed of, for example, a rubber member or a resin member and is a solid, so that the replacement can be facilitated.
In addition, since the top plate is not provided on the back side of the stamper, the number of parts can be reduced.

According to the invention of claim 6 , the viscous material cartridge is provided on the back side of the transfer means and accommodates the viscous material therein. Therefore, when the hot press molding apparatus presses the base material, the viscous body is compressed, and a uniform pressure is generated inside the viscous body. Therefore, the viscous cartridge can press each part of the transfer unit against the substrate with an equal force by the viscous body, and the substrate can be transferred to the substrate without applying an excessive temperature or surface pressure to the substrate. It is possible to make the distribution of the contact surface pressure received from the surface uniform.
In addition, since the viscous body cartridge accommodates the viscous body, the viscous body can be easily replaced only by replacing the viscous body cartridge.

Furthermore, according to the invention of claim 6 , the second elastic frame member that is thinner than the first elastic frame member and has the same thickness as the viscous member is provided outside the first elastic frame member that seals the viscous member. Therefore, when the viscous cartridge is compressed, the first elastic frame member is crushed and the second elastic frame member is in close contact with the two thin plates, so that the viscous member can be sufficiently sealed.
Moreover, since the second elastic frame member has a larger hardness than the first elastic frame member and has the same thickness as the viscous body, the second elastic frame member is hardly crushed. Therefore, when the viscous cartridge is compressed, the second elastic frame member can restrict the first elastic frame member from spreading outward. Therefore, the first elastic frame member is crushed and spreads outside the thin plate, and the portion spread outside the thin plate is between the bottom plate provided on the back surface of the viscous cartridge and the inner wall of the opening of the frame. It can prevent being pinched and damaged.

According to the seventh aspect of the present invention, since the viscous material is formed of gel-like or grease-like silicone, when the viscous material cartridge is compressed, the uniform pressure is surely generated inside the viscous material. Can do.

  According to the eleventh aspect of the present invention, since the viscous body is formed of a low melting point metal having a melting point lower than the softening temperature of the base material, the viscous body becomes soft when heated by the bottom plate or the like during transfer. Therefore, when the viscous cartridge is compressed during transfer, it is possible to reliably generate a uniform pressure in the viscous body.

[First Embodiment]
[1. Overall configuration of hot press molding equipment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a hot press molding apparatus 1 according to the present embodiment. 1 is a cross-sectional view taken along a line II in FIG. 6 to be described later.
As shown in FIG. 1, the hot press molding apparatus 1 includes a press apparatus 2 and a mold apparatus 3.

[2. Configuration of press machine]
The press device 2 includes a bolster 21 fixed to the floor, a slide 22 disposed above the bolster 21, a servo motor, and a drive unit 23 that moves the slide 22 close to and away from the bolster 21. And a control means 24 having a CPU (Central Processing Unit) and controlling the entire press apparatus 2.

[3-1. Overall configuration of mold equipment]
The mold apparatus 3 includes a lower mold part 3A provided on the bolster 21 and on which the base material m is placed, and an upper mold part 3B provided on the slide 22. As the base material m, an acrylic plate which is a base material of a light guide plate used for a liquid crystal display is used. Since the basic configuration of each mold part 3A, 3B is substantially equal, the configuration of each mold part 3A, 3B will be described below taking the lower mold part 3A as an example.

[3-2. Overall structure of mold part)
FIG. 2 is an enlarged sectional view showing a part of the lower mold part 3A.
As shown in FIG. 2, each mold part 3A, 3B (lower mold part 3A) includes a base plate 31, a cooling plate 32, a temperature adjustment plate 33, a frame body 34, a stamper 35, and a spacer 36. And a viscous cartridge 4.

[3-3. Base plate configuration
The base plate 31 is formed in a rectangular plate shape and is fixed on the bolster 21 and the slide 22. In the base plate 31, a vacuum suction hole 311 (see FIG. 4) and a thermocouple insertion hole 312 (see FIG. 4) are formed. Among these, the thermocouple insertion hole 312 extends to a cooling plate 32 and a temperature control plate 33 described later, and opens on the upper surface of the temperature control plate 33. A thermocouple (not shown) connected to the control means 24 is inserted into the thermocouple insertion hole 312. The tip of the thermocouple is installed between the stamper 35 and the viscous cartridge 4, measures the temperature of the stamper 35, and outputs it to the control means 24.

[3-4. Cooling plate configuration)
The cooling plate 32 is formed in a rectangular plate shape and is fixed between the base plate 31 and the temperature control plate 33. A plurality of water holes 321 are formed in the cooling plate 32. As the cooling water flows through these water holes 321, the temperature of the cooling plate 32 is kept constant, and heat of the temperature adjustment plate 33 described later is prevented from being transmitted to the bolster 21 and the slide 22. The water hole 321 is connected to an external device (not shown) so that the cooling water circulates between the external device. The water holes 331 of the temperature control plate 33 and the water holes 342 of the frame 34 described later have the same configuration.

[3-5. Configuration of temperature control plate)
The temperature control plate 33 is formed in a rectangular plate shape and is provided on the cooling plate 32. Such a temperature control plate 33 is provided with a stepped portion 330, and the temperature control plate 33 is formed in a convex shape in a sectional view with a tip portion slightly smaller than a base end portion.

FIG. 3 is an enlarged cross-sectional view of the lower mold part 3 </ b> A for explaining the configuration related to the water hole 331. Specifically, FIG. 3 is a part of a cross-sectional view taken along line III-III in FIG.
As shown in FIGS. 2 and 3, a plurality of water holes 331 are formed in the temperature adjustment plate 33. Opening portions at both ends of the water hole 331 are sealed with stopper plugs 333. In the vicinity of both ends of the temperature control plate 33, a manifold portion 334 is formed by digging into a rectangle (FIG. 3) from the surface on the base plate 31 side. The manifold part 334 connects the plurality of water holes 331.

A rectangular parallelepiped manifold block 382 is fixed to the surface of the temperature control plate 33 on the base plate 31 side so as to close the opening of the manifold portion 334. An O-ring A4 for preventing water leakage is interposed between the manifold block 382 and the temperature control plate 33.
The manifold block 382 has the same thickness as the cooling plate 32 and is interposed between the base plate 31 and the temperature control plate 33 together with the cooling plate 32. In such a manifold block 382, a manifold connecting portion 383 that is dug into a rectangle (FIG. 3) and connected to the manifold portion 334, is connected to the manifold connecting portion 383, and penetrates the manifold block 382 in the vertical direction. A through hole 384 is formed.

In accordance with the position of the through hole 384, a rectangular portion 313 is formed on the surface of the base plate 31 on the manifold block 382 side. Further, the base plate 31 is formed with a through hole 314 (FIG. 3) penetrating in a horizontal direction from the dug portion 313 to the side surface of the base plate 31.
In the digging portion 313, a piping block 316 is arranged in a form embedded via a heat insulating sheet 315. The pipe block 316 has two holes 317 and 318 that are orthogonal to and communicate with each other.

Both ends of the pipe 385 are fitted into the through hole 384 of the manifold block 382 and the hole 317 of the piping block 316, respectively. O-rings A5 and A6 for preventing water leakage are interposed between the pipe 385 and the manifold block 382 and the piping block 316, respectively.
A pipe 319 is inserted into the through hole 314 of the base plate 31 from the end surface of the base plate 31. One end of the pipe 319 is fitted into the hole 318 of the pipe block 316. In addition, an O-ring A7 for preventing water leakage is interposed between the pipe 319 and the pipe block 316.

  The other end of the pipe 319 is connected to a temperature control device (not shown) under the control means 24 so that steam and cooling water circulate between the temperature control device and the water hole 331 of the temperature control plate 33. It is configured. As a result, the temperature control plate 33 is heated and cooled to a desired temperature by supplying steam and cooling water to the temperature control device, and the stamper 35 is heated and cooled via the viscous material cartridge 4. In addition, as a heat medium distribute | circulated to the water hole 331, you may use high temperature oil instead of water vapor | steam, for example.

  The temperature adjustment plate 33 is provided so as to be slightly movable in the vertical direction with respect to the cooling plate 32 by a plurality of stripper bolts 332 (FIG. 1). Thereby, in this embodiment, the bolt for fixing the said temperature control plate 33 with respect to the cooling plate 32 will deform | transform or loosen by the dimensional change of the up-down direction by the thermal expansion and thermal contraction of the temperature control plate 33. This can be suppressed. In the present embodiment, the temperature control plate 33 is a bottom plate provided on the back side of the viscous body 43 described later.

[3-6-1. (Configuration of the opening of the frame)
The frame body 34 is formed in a rectangular frame shape, and the plates 32 and 33 and the viscous body cartridge 4 are provided in the opening 340. The inner edge of the opening 340 is larger than the outer edge of the base material m provided on the frame body 34 via the stamper 35. Thereby, in this embodiment, although mentioned later in detail, the base material m will be provided in the planar view inner side of the viscous body cartridge 4 (viscous body 43) provided in the opening part 340, and it is uniform on the whole surface of the base material m. It is possible to apply various molding pressures.

[3-6-2. (Configuration of the gap between the frame and each plate)
Further, the opening 340 is provided with a stepped portion 341 having a shape corresponding to the stepped portion 330 of the temperature control plate 33. The opening 340 includes a surface-side opening 340A disposed on the surface side and a surface-side opening 340A. A back side opening 340B on the back side having an opening area larger than that of the opening 340A. A gap S <b> 1 is provided between the inner edge of the opening 340 and the outer edge of the temperature control plate 33.

  Specifically, the gap S1 is formed by a gap S11 provided between the inner edge of the surface side opening 340A and the outer edge of the temperature adjustment plate 33, and the inner edge of the back opening 340B and the outer edge of the temperature adjustment plate 33. The gap S12 is provided between them, and these gaps S11 and S12 are set to have different dimensions.

A gap S11 between the inner edge of the surface side opening 340A and the outer edge of the temperature control plate 33 is set to 0.5 mm, for example, and the outer edge of the temperature control plate 33 is changed by a dimensional change accompanying thermal expansion and contraction of the temperature control plate 33. Is set so as not to be pressed against the inner edge of the surface side opening 340A, and to a size sufficiently small to seal the viscous cartridge 4.
In addition, the gap S12 between the inner edge of the back opening 340B and the outer edge of the temperature adjustment plate 33 is set to a larger dimension than the gap S11, for example, 1 to 2 mm. In other words, the gap S12 is set to a dimension that makes the machining of the mold easy because the machining tolerance of the mold related to the gap S12 is not strict.

These gaps S1 are also used by a vacuum pump (not shown) to suck the air in the gap S1 from the vacuum suction hole 311 (see FIG. 4) and fix the stamper 35 to the frame 34.
A plurality of water holes 342 are formed in the frame body 34. As the cooling water flows through these water holes 342, the temperature of the frame body 34 is maintained at about 40 degrees.

[3-6-3. (Connection structure of frame and base plate)
The frame 34 is connected to the base plate 31 by stripper bolts 343 (FIG. 1) and a spring 344, is slidable up and down, and is urged upward by the spring 344.
Such upper and lower frames 34 are moved toward the base plate 31 against the urging force of the spring 344 when the slide 22 is lowered and the base material m is pressed by the mold parts 3A and 3B. Move the slide. Then, when the slide 22 rises from this state, the frame 34 slides and moves away from the base plate 31 by the urging force of the spring 344 along with the rise.
Between the frame 34 and the base plate 31 and between the frame 34 and the stamper 35, frame-shaped packings A1 and A2 are interposed, and the gap S1 is sealed.

[3-6-4. Configuration for forming a sealed space]
FIG. 4 is a cross-sectional view showing a cross section of the hot press molding apparatus 1 different from FIGS. Specifically, FIG. 4 is a cross-sectional view taken along line IV-IV in FIG.
As shown in FIG. 4, a vacuum frame 345 is connected to the frame body 34 of the upper mold part 3B by a stripper bolt 3450 and a spring 3451 so as to be slidable up and down. Yes. A packing A3 is provided on the lower surface of the vacuum frame 345. A pair of positioning pins 346 (only one is shown in FIG. 4) are provided on the frame body 34 of the upper mold part 3B so as to face each other with the temperature control plate 33 in plan view.

  On the other hand, a vacuum suction hole 347 and an air release hole 348 (see FIG. 6) are formed in the frame 34 of the lower mold part 3A. The vacuum suction hole 347 is connected to a vacuum pump through a valve (not shown). The air release hole 348 communicates with the outside of the hot press molding apparatus 1 through a valve (not shown). Each valve is under the control of the control means 24. Thereby, when the control means 24 lowers the slide 22 and forms a sealed space inside the vacuum frame 345, the valve on the atmosphere release hole 348 side is closed and the valve on the vacuum suction hole 347 side is opened. The air in the sealed space can be evacuated by a vacuum pump through the vacuum suction hole 347, and the sealed space can be evacuated. In addition, the control means 24 can release the air release hole 348 and release the vacuum state of the sealed space by closing the valve on the vacuum suction hole 347 side and opening the valve on the air release hole 348 side.

  Further, positioning holes 349 are formed in the frame 34 of the lower mold part 3A at positions corresponding to the positioning pins 346, respectively. In the present embodiment, by inserting the positioning pins 346 into the positioning holes 349, the relative positions of the mold parts 3A and 3B can be positioned, and as a result, the stampers attached to the mold parts 3A and 3B. The relative positions of 35 can be accurately positioned.

  A pressure sensor attachment hole 370 is further formed in the frame 34 of the lower mold part 3A. A pressure sensor (not shown) connected to the control means 24 is attached to the pressure sensor attachment hole 370. The pressure sensor measures the pressure in the sealed space and outputs it to the control means 24 when the sealed space is formed inside the vacuum frame 345.

[3-6-5. (Configuration to hold the stamper)
FIG. 5 is a cross-sectional view showing the fixed slider 372, and FIG. 6 is a plan view of the lower mold part 3A.
As shown in FIGS. 5 and 6, the frame 34 of each mold part 3A, 3B has a plurality of storage grooves 371, a fixed slider 372 stored in each storage groove 371, and a plurality of storage grooves 371. An escape groove 373 (FIG. 6) is provided.
The fixed slider 372 is composed of two fixed sliders 372A and 372B facing each other.

Such a fixed slider 372 (372A, 372B) includes a fixed block 374 and a slider body 375.
The fixed block 374 is fixed to the slider body 375 with bolts 376. The fixing block 374 presses the end edge of the stamper 35 via the spacer 36 and positions and fixes the stamper 35 at a predetermined position of the frame body 34. As described above, in this embodiment, the stamper 35 is positioned and fixed by the fixing block 374 provided on the frame body 34 maintained at a constant temperature. Therefore, the relative position of the stamper 35 attached to each mold part 3A, 3B. Can be positioned more accurately.

  The slider body 375 is formed with a track hole 377 extending in a direction orthogonal to the corresponding side of the stamper 35. The slider body 375 is slidably moved toward the corresponding side of the stamper 35 by a stripper bolt 378 that is inserted into the track hole 377 and screwed into the frame body 34.

A spring 379 is interposed between the slider main body 375 and the frame body 34, and the fixed slider 372 is urged toward the corresponding side of the stamper 35 by the spring 379. The spring 379 of the fixed slider 372A is stronger than the spring 379 of the fixed slider 372B. As a result, when the stamper 35 is fixed by the fixing block 374, the fixed slider 372B side having the spring 379 having a weak elastic force is biased to the outside, and therefore the fixed slider 372A having the spring 379 having a strong elastic force is biased. The fixed block 374 can be used as a reference for the mounting position of the stamper 35.
Further, since the fixed slider 372 is slidably provided toward the corresponding side of the stamper 35 on the frame body 34 whose temperature is kept constant by the cooling water, thermal expansion and heat are generated in the horizontal direction during thermal transfer. The dimensional change of the contracting stamper 35 can be absorbed by the fixed slider 372.

A key groove 380 is provided at the tip of the slider main body 375, and a key 381 having a desired thickness is inserted into the key groove 380 so that the slider main body 375 faces the corresponding side of the stamper 35. The position, and thus the position of the fixed block 374 can be finely adjusted.
When the bolster 21 and the slide 22 are close to each other, the escape groove 373 accommodates the fixed block 374 of the fixed slider 372 provided in the opposing mold portions 3A and 3B.

[3-7. Stamper configuration)
The stamper 35 is formed in a rectangular plate shape, and an outer edge portion is fixed to the peripheral edge portion of the opening 340 of the frame body 34 as shown in FIG. Specifically, as described above, the stamper 35 is fixed to the frame body 34 by vacuum suction using the gap S <b> 1 and pressing by the fixed slider 372. With this stamper 35, the opening 340 is closed, and an accommodation space V <b> 1 surrounded by the stamper 35, the temperature control plate 33, and the frame body 34 is formed. In the storage space V1, a viscous cartridge 4 described later is stored.

  On the surface of the stamper 35, a predetermined shape pattern including a fine uneven pattern is formed. The stamper 35 is heated to a temperature equal to or higher than the softening temperature of the base material by the temperature control plate 33 and then pressed against the base material m, thereby thermally transferring a predetermined shape pattern to the base material m. Such a stamper 35 has a sufficient strength (thickness) that does not cause plastic deformation when a gap S2 with a spacer 36, which will be described later, is pushed up by the viscous cartridge 4 when the substrate m is pressed. ing. The transfer means that is fixed to the frame 34 and closes the opening 340 and thermally transfers the shape pattern to the base material m is composed of this stamper 35 in this embodiment.

[3-8. (Spacer configuration)
The spacer 36 is formed in a rectangular frame shape whose outer edge is equal to the outer edge of the stamper 35. The spacer 36 is fixed on the frame body 34 by being placed on the stamper 35 and being pressed by the fixed slider 372. Inside the spacer 36, the base material m is installed through a slight gap S2. That is, the inner edge of the spacer 36 is arranged with a slight gap S2 from the outer edge of the base material m, and the outer edge is arranged outside the opening 340 of the frame body 34.

  The plate thickness of the spacer 36 is substantially the same as the plate thickness of the base material m. Further, since the base material m is an acrylic plate and is a thermoplastic plate, there is usually a plate pressure variation of about 10%, but the plate thickness of the spacer 36 is the maximum thickness of the plate thickness variation of the base material m. The thickness is preferably within 0.1 mm. As the material of the spacer 36, stainless steel (SUS) or the same material as the stamper 35 can be used.

  Here, when the slide 22 is lowered and the base material m is pressurized by the mold parts 3A and 3B, the frame 34 slides to the base plate 31 side, and the viscous material cartridge 4 to be described later becomes the base material m. Then, it is compressed by the stamper 35 via the spacer 36. At this time, an internal pressure is generated in the viscous body 43 in the viscous cartridge 4 due to the reaction force, and the stamper 35 on the outer portion of the base material m is pushed up by the internal pressure. However, in this embodiment, since the stamper 35 on the outer side of the base material m can be pressed by the spacer 36, the stamper 35 can be prevented from being pushed up by the viscous body 43 and plastically deformed. Can be improved.

  Further, the stamper 35 in the gap S2 portion between the base material m and the spacer 36 is pushed upward by the internal pressure generated in the viscous body 43 of the viscous cartridge 4, and is elastically deformed. Thus, it has sufficient strength that it does not undergo plastic deformation. Therefore, when the strength of the stamper 35 is low, it is necessary to provide a top plate on the back surface of the stamper 35 and reduce the pressure received by the gap S2 portion of the stamper 35 from the viscous body 43. In the present embodiment, however, the stamper 35 Therefore, it is unnecessary to provide a top plate on the lower surface of the stamper 35, and the number of parts can be reduced.

  Here, when the gap S2 is set small, the elastic deformation of the base material m can be suppressed. However, when the gap S2 is set small, the variation in the surface pressure applied by the stamper 35 between the vicinity of the outer edge of the base material m and the central portion of the base material m is large due to the difference in the plate thickness between the base material m and the spacer 36. turn into. On the other hand, when the gap S2 is set large, the stamper 35 in the gap S2 portion is pushed up and elastically deformed, so that a difference in plate thickness between the base material m and the spacer 36 can be absorbed, and in the vicinity of the outer edge of the base material m. And the dispersion | variation in the surface pressure of the base material m center part can be suppressed. However, since the amount of elastic deformation of the stamper 35 increases, the durability of the stamper 35 in the gap S2 portion decreases.

  Therefore, the dimension of the gap S2 is adjusted in consideration of such advantages and disadvantages. In addition to the dimension adjustment of the gap S2, the variation in the surface pressure applied to the base material m is controlled by adjusting the plate thickness of the spacer 36 and the base material m. In the present embodiment, in addition to such control, variations in surface pressure applied to the base material m are reduced by the viscous cartridge 4 described later.

[3-9. Substrate composition)
As described above, the base material m is an acrylic plate (PMMA (Polymethylmethacrylate) plate) that is a base material of a light guide plate used in a liquid crystal display, is formed in a rectangular plate shape, and is disposed inside the spacer 36. .

[3-10. Viscous cartridge configuration
As shown in FIG. 5, the viscous body cartridge 4 is accommodated in an accommodation space V <b> 1 surrounded by the stamper 35, the temperature adjustment plate 33, and the frame body 34.

FIG. 7 is a cross-sectional view showing the viscous body cartridge 4, and FIG. 8 is a plan view showing the viscous body cartridge 4.
As shown in FIGS. 7 and 8, the viscous cartridge 4 is formed in a rectangular shape in plan view. The viscous body cartridge 4 includes a pair of thin plates (shim) 41, an elastic frame member 42, and a viscous body 43.

  The thin plate 41 is formed from SUS (stainless steel) having a plate thickness of 0.3 mm. Thus, in this embodiment, since the thin plate 41 is metal, the heat from the temperature control plate 33 can be favorably transmitted to the stamper 35. In addition, it is preferable that the thin plate 41 is formed from metals, such as brass and SPCC (cold rolled steel plate) other than SUS. The plate thickness of the thin plate 41 is preferably between 0.1 and 0.5 mm.

The elastic frame member 42 includes a first elastic frame member 421 and a second elastic frame member 422.
The first elastic frame member 421 is provided between the thin plates 41 and forms the accommodation space V <b> 2 with the thin plate 41. A viscous body 43 described later is accommodated (filled) in the accommodation space V2. Such a first elastic frame member 421 is formed to have a width of 4 mm and a thickness of 3 mm, and is designed to be equal to the thickness of the viscous body 43 when crushing by about 30%. The first elastic frame member 421 is made of a PMF (fluororubber) material having a hardness of Shore A 80, which is unlikely to be permanently deformed even when repeatedly subjected to a load at a high temperature.
The air between the upper thin plate 41 and the viscous body 43 is sucked together with the air in the gap S1 when air is sucked from the vacuum suction hole 311 for sucking the stamper 35.

  The second elastic frame member 422 is provided outside the first elastic frame member 421 between the thin plates 41. The second elastic frame member 422 has a width of 3 mm and a thickness of 2 mm, which is thinner than the first elastic frame member 421 and has the same thickness as the viscous body 43. In addition, the second elastic frame member 422 is made of PTFE (tetrafluoroethylene) having a high hardness although a permanent change may occur when a load is repeatedly applied at a high temperature.

  The viscous body 43 is made of gel-like silicone (silicone rubber) having a high thermal conductivity of 2 W / mk or higher. Viscous material means an object that has a sticky property and generates a force (frictional force) that tries to make the velocity uniform when a flow occurs in a part of the inside due to an external force. To do. The viscous body 43 is formed with a thickness of 2 mm. In addition, the viscous body 43 may be formed from grease-like silicone.

Such a viscous body 43 is accommodated in the viscous body cartridge 4 as described above. Therefore, when the viscous body 43 is provided directly in the accommodation space V1 formed in the frame body 34, the viscosity that adheres to the temperature control plate 33, the frame body 34, and the stamper 35 when the viscous body 43 is replaced. Although the operation of wiping off the body 43 is necessary, in this embodiment, since the viscous body 43 is accommodated in the viscous body cartridge 4, the viscous body 43 can be replaced by replacing the viscous body cartridge 4. . Therefore, the above operation can be made unnecessary and the viscous body 43 can be easily replaced.
In addition, since the viscous body 43 is formed of a high thermal conductivity silicone rubber having a thermal conductivity of 2 W / mk or more, the heat of the temperature control plate 33 can be transmitted to the stamper 35 satisfactorily.

FIG. 9 is a cross-sectional view showing the compressed viscous cartridge 4.
When the viscous cartridge 4 is pressed when the base material m is pressed, as shown in FIG. 9, the thin plates 41 come close to each other and the thick first elastic frame member 421 is crushed. The viscous body 43 is sealed and compressed by the thin plate 41 and the first elastic frame member 421. Thereby, in this embodiment, since pressure is uniformly generated inside the viscous body 43, the viscous body cartridge 4 causes each part of the stamper 35 provided on the viscous body cartridge 4 to be applied to the base material m with equal force. Therefore, the distribution of the contact surface pressure that the base material m receives from the stamper 35 can be made uniform.

  As described above, in the present embodiment, the base material m is provided on the back surface of the stamper 35 without changing the normal pressing process such as increasing the time for pressing the base material m. Since the distribution of the contact surface pressure received from the air is made uniform, the equipment cost, running cost, production time, etc. can be maintained well. Moreover, the base material m can be pressed favorably without causing warpage or undulation in the base material m.

  Moreover, in this embodiment, the inner edge of the opening part 340 is larger than the outer edge of the base material m, and the outer edge of the viscous body 43 of the viscous body cartridge 4 provided in the opening part 340 is larger than the outer edge of the base material. Therefore, the base material m is provided inside the viscous body 43 in plan view. Therefore, the stamper 35 can be pressed against the entire surface of the base material m by the viscous body 43 with an equal force, and the shape pattern of the stamper 35 can be transferred onto the entire surface of the base material m.

  Here, since the 2nd elastic frame material 422 is formed in the same thickness as the viscous body 43, when the viscous body cartridge 4 is pressurized, it is not crushed. Therefore, when the first elastic frame member 421 is provided along the edge of the viscous cartridge 4, the first elastic frame member 421 is crushed by about 30% when the viscous cartridge 4 is pressurized. Then, it spreads out in the horizontal direction and jumps out of the outer edge of the thin plate 41, and the protruding part may be caught in the gap S11 between the temperature control plate 33 and the frame body 34 and damaged. However, in the present embodiment, since the second elastic frame member 422 that is not crushed is provided along the edge of the viscous cartridge 4, the second elastic frame 4 is pressed when the viscous cartridge 4 is pressurized. The material 422 can restrict the first elastic frame member 421 from spreading outward. For this reason, it can prevent that the 1st elastic frame material 421 is pinched | interposed into said clearance gap S11, and is damaged, and can make durability of the viscous body cartridge 4 favorable.

[4. Molding motion of heat press molding equipment)
Hereinafter, the molding motion of the hot press molding apparatus 1 will be described.
FIG. 10 is a diagram for explaining a molding motion of the hot press molding apparatus 1. Specifically, FIG. 10A is a diagram showing a change in the vertical position of the slide 22 (in one cycle of molding motion), FIG. 10B is a diagram showing a change in pressing force, and FIG. ) Is a diagram showing a temperature change of the stamper 35, and FIG. 10D is a diagram showing a pressure change in the sealed space in the vacuum frame 345.

  At time t1, the base material m is set on the stamper 35 of the lower mold part 3A, and the slide 22 is at the upper limit position B1.

  From time t1 to time t2, the control means 24 lowers the slide 22 to a position B2 where the lower surface of the vacuum frame 345 contacts the frame body 34 of the lower mold portion 3A, and the base material is placed inside the vacuum frame 245. A sealed space containing m and the like is formed.

  From time t2, the control means 24 starts evacuating the sealed space and starts supplying high-temperature steam to the temperature control plate 33.

  At time t3, when the pressure in the sealed space reaches a degree of vacuum P2 suitable for thermal transfer, the control unit 24 switches the control of the slide 22 from position control to pressure control. Then, the control means 24 lowers the slide 22 to a position B3 where the pressure applied to the base material m becomes L1, and presses the upper and lower stampers 35 on both surfaces of the base material m with the preliminary pressure L1 until time t4. The degree of vacuum P2 is set to −90 KPa or less, and the preliminary pressure L1 is set so that the surface pressure applied to the base material m is 1 MPa.

In this manner, air is prevented from remaining between the base material m and the stamper 35 by not pressing the stamper 35 against the base material m until time t3 when the pressure in the sealed space reaches the degree of vacuum P2. be able to. As a result, it is possible to prevent the occurrence of a transfer defect such that a part of the shape pattern is not transferred due to residual air.
Further, from time t3 to time t4, the temperature control plate 33, the viscous material cartridge 4, and the stamper 35 are brought into close contact with each other by pressing the stamper 35 against both surfaces of the base material m with the preliminary pressure L1. The heat can be effectively transferred to 35 so that the stamper 35 can be heated satisfactorily.

  When the temperature of the stamper 35 reaches the transferable temperature H2 at time t4, the control unit 24 lowers the slide 22 to a position B4 where the applied pressure to the base material m becomes the transferable applied pressure L2. Then, from time t5 to time t6 when the applied pressure to the substrate m reaches the transferable applied pressure L2, the control unit 24 heats the substrate m with the temperature control plate 33 and transfers the stamper 35 with the transferable applied pressure L2. Is continuously pressed to the base material m.

  When pressing the base material m, in the present embodiment, the upper and lower frame bodies 34 slide to the base plate 31 side against the urging force of the springs 344, respectively. As the frame body 34 moves, the viscous body cartridge 4 is compressed by the stamper 35 via the base material m and the spacer 36, and a uniform pressure is generated in the viscous body 43 in the viscous body cartridge 4. Each part of the stamper 35 provided on the cartridge 4 can be pressed against the base material m with an equal force, and the contact surface pressure distribution received by the base material m from the stamper 35 can be made uniform. Therefore, the shape pattern of the stamper 35 can be satisfactorily transferred to the base material m.

  In this embodiment in which the substrate m is an acrylic plate, the transferable temperature H2 is set to 120 to 150 ° C., and the transferable pressure L2 is such that the surface pressure applied to the substrate m is 4 to 6 MPa. Set to Further, the time T from time t5 to time t6 during which the base material m is continuously pressurized while being heated is set to an optimal value so as not to cause a transfer defect depending on the material of the base material m and the shape pattern of the stamper 35. Is done.

  At time t6, the control unit 24 stops supplying steam to the temperature control plate 33, supplies cooling water to the temperature control plate 33, and cools the viscous cartridge 4, the stamper 35, and the base material m. . And the shape pattern is fixed to the base material m by cooling the base material m.

  At time t7, when the temperature of the stamper 35 reaches the mold releaseable temperature H1, the control unit 24 opens the sealed space inside the vacuum frame 245 to the atmosphere. Thereby, the pressure in the sealed space returns to the atmospheric pressure P1 at time t8. In the present embodiment in which the base material m is an acrylic plate, the releasable temperature H1 is set to 50 to 80 ° C.

  At time t8, the control unit 24 switches the control of the slide 22 from the pressure control to the position control again, and raises the slide 22 to the upper limit position B1. Thereby, the base material m can be taken out.

[5-1. Example 1: Comparison of contact surface pressure distribution]
In a conventional hot press molding apparatus in which a stamper is directly disposed on a temperature control plate and the hot press molding apparatus 1 of the present embodiment, pressurization is performed so that a surface pressure of 6 MPa is applied to the base material, respectively. The distribution of the contact surface pressure received by the substrate from the mirror plate described below was used. As the substrate, an acrylic plate (PMMA plate) having dimensions of 340 × 217 × 0.7 mm was used. In the molding apparatus 1 of this embodiment, a rigid spacer having a plate thickness of 0.7 mm is used as the spacer. In each molding apparatus, a mirror surface plate having a plate pressure of 2 mm is used instead of the stamper, and a pressure sensitive paper is interposed between the mirror surface plate and the base material, and each molding apparatus has a room temperature of 25 ° C. for 5 seconds. The distribution of contact surface pressure when the substrate was pressed was measured.

FIG. 11 is a diagram showing a contact surface pressure distribution in a conventional molding apparatus, and FIG. 12 is a diagram showing a contact surface pressure distribution in the molding apparatus 1 of the present embodiment. In each of FIGS. 11 and 12, the dark portion indicates that the pressure is high, and the light portion indicates that the pressure is low.
As shown in FIG. 11, it can be seen that a large unevenness occurs in the contact surface pressure of the base material portion 350 in the conventional molding apparatus.
As shown in FIG. 12, in the contact surface pressure distribution in the molding apparatus 1 of the present embodiment, the surface pressure distribution due to the spacer portion 360 appears around the base material portion 350. From FIG. 12, in the molding apparatus 1 of the present embodiment, although the surface pressure with a width of about 5 mm at the outer edge of the base material portion 350 is slightly increased, a uniform contact surface pressure can be obtained at the base material portion 350. I understand.

[5-2. Example 2: Comparison of thickness distribution]
In the conventional hot press molding apparatus and the hot press molding apparatus 1 of the present embodiment, the base material was press molded, and the thickness distribution of the base material before and after the press molding was measured. As in Example 1, an acrylic plate having dimensions of 340 × 217 × 0.7 mm was used as the substrate.

FIG. 13 is a diagram showing a plate thickness distribution of a base material before press molding in a conventional molding device, and FIG. 14 is a diagram showing a plate thickness distribution of a base material after press molding in a conventional molding device. 13 and 14, the horizontal axis indicates the position in the long side (340 mm) direction of the substrate, and the graph series indicates the position in the short side (217 mm) direction. For example, the graph (1) shows the result of measuring the plate thickness at a position 10 mm inside from the long side to the short side of the substrate at each point along the long side.

As shown in FIGS. 13 and 14, in the conventional molding apparatus, the maximum thickness variation before press molding is 0.02 mm, whereas the maximum thickness variation after press molding is 0.093 mm. It can be seen that it is getting bigger.
Further, it can be seen that the state of plate thickness variation before press forming is greatly different from the state of plate thickness variation after press forming. This is because, as described above in Example 1, in the conventional molding apparatus, the contact surface pressure received by the base material from the stamper is uneven, so that the amount of deformation in the thickness direction of each part of the base material varies. Conceivable.

FIG. 15 is a diagram showing a plate thickness distribution of the base material before press molding in the molding apparatus 1 of the present embodiment, and FIG. 16 shows a plate thickness distribution of the base material after press molding in the molding device 1 of the present embodiment. FIG.
As shown in FIGS. 15 and 16, in the molding apparatus 1 of the present embodiment, the maximum thickness variation before press molding is 0.015 mm, whereas the maximum thickness variation after press molding is 0.15 mm. It can be seen that it remains at 0.052 mm.

Further, in the plate thickness distribution after press molding in FIG. 16, as shown in the graph of ◆, the plate thickness is locally reduced in the portion entering the 5 mm short side direction from the long side of the base material. I understand that. This is presumably because, as described above in Example 1, in the molding apparatus 1 of the present embodiment, the surface pressure having a width of about 5 mm at the outer edge portion of the base material portion 350 slightly increases.
In the plate thickness distribution after press molding in FIG. 16, the plate thickness variation at the portion excluding the 5 mm width portion on the outer periphery is 0.016 mm at the maximum, which is the same as the plate thickness variation before press molding. It can be seen that the variation tendency is the same as the plate thickness variation before press molding. Therefore, it can be seen that in the molding apparatus 1 of the present embodiment, a uniform contact surface pressure can be applied to the base material even if the plate thickness of the base material varies.

[6. Second Embodiment]
This embodiment is not included in the present invention, but will be described as a reference form. FIG. 17 is a cross-sectional view showing the hot press molding apparatus 1A according to the present embodiment, and FIG. 18 is a plan view of the lower mold part 3A. In FIG. 17 and FIG. 18, the hot press molding apparatus 1 </ b> A is simplified for easy understanding. Henceforth, the same code | symbol is attached | subjected to the same functional part as the said 1st Embodiment, and those description is abbreviate | omitted or simplified.

In the first embodiment, the inner edge of the opening 340 of the frame 34 is larger than the outer edge of the base material m. However, in the present embodiment, as shown in FIGS. 17 and 18, the opening 340 of the frame 34 is used. Is characterized in that the inner edge is smaller than the outer edge of the base material m. Thereby, in this embodiment, since the outer edge of the viscous body 43 becomes smaller than the outer edge of the base material m , the viscous body 43 does not jump out of the outer edge of the base material m. Therefore, since it is not necessary to press the predetermined portion of the stamper 35 pressed by the viscous body 43 of the portion protruding from the outer edge of the base material m with the spacer 36, the spacer 36 can be eliminated and the number of parts can be reduced. be able to. Other configurations are the same as those in the first embodiment.

[7. Third Embodiment]
This embodiment is not included in the present invention, but will be described as a reference form. FIG. 19 is a cross-sectional view showing a hot press molding apparatus 1B according to this embodiment.
In the first embodiment, the viscous body 43 housed in the viscous body cartridge 4 is made of gel-like silicone, but in this embodiment, the viscous body 43A housed in the viscous body cartridge 4A is The first characteristic is that the softening temperature is formed from a low-melting-point metal having a temperature lower than that of a thermoplastic resin such as an acrylic resin. Here, in general, an alloy having a low melting point is formed by alloying different kinds of metals such as Pb (lead), Bi (bismuth), Sn (tin), Cd (cadmium), and In (indium). It is known that you can. The viscous body 43A of the present embodiment is formed of a known low melting point metal having a low melting point utilizing such properties, so that the softening temperature is lower than that of a thermoplastic resin such as an acrylic resin.

  Also in this embodiment, the viscous body 43A is formed of a low melting point metal whose softening temperature is lower than that of the thermoplastic resin. Therefore, when pressing the base material m, the heat from the temperature control plate 33 is used. As a result, the viscous body 43A is warmed and softened. Therefore, when the viscous material cartridge 4A is pressurized when the base material m is pressed, the viscous material 43A can surely generate a uniform pressure inside, and each part of the stamper 35 is applied to the base material m. It can surely be pressed with equal force. Therefore, the distribution of the contact surface pressure that the base material m receives from the stamper 35 can be made uniform.

  In the first embodiment, the viscous body cartridge 4 is provided directly on the back side of the stamper 35. However, in this embodiment, a top plate 38 is provided between the stamper 35 and the viscous body cartridge 4. This is the second feature. Thereby, in this embodiment, since the surface pressure from the viscous cartridge 4 applied to the gap S2 between the stamper 35 and the spacer 36 can be reduced, even if the stamper 35 does not have sufficient strength, It is possible to prevent the gap S <b> 2 portion with the spacer 36 from being plastically deformed by the surface pressure from the viscous material cartridge 4. In the present embodiment, the top plate 38 and the stamper 35 constitute transfer means.

[8. Fourth Embodiment]
20 is a cross-sectional view showing the hot press molding apparatus 1C according to the present embodiment, and FIG. 21 is a plan view of the lower mold part 3A.
In the first embodiment, the viscous material cartridge 4 is provided on the back side of the stamper 35. However, in this embodiment, the rubber member 5 is provided on the back side of the stamper 35 as shown in FIGS. This is a feature.

  The rubber member 5 is housed in a housing space V1 surrounded by the temperature control plate 33, the frame body 34, and the stamper 35. The rubber member 5 has a plate thickness of about 2 to 5 mm and is made of silicone rubber. Since silicone rubber generally has low thermal conductivity, in this embodiment, thermal conductivity is increased by adding an additive such as alumina or ceramic to the base silicone. In general, when the amount of the additive is increased, the thermal conductivity of the silicone rubber is improved, but the hardness is lowered and the silicone rubber is in a gel or clay state.

As described above, even in this embodiment in which the rubber member 5 is provided on the back side of the stamper 35, when the base material m is pressed, a uniform pressure is generated inside the rubber member 5. Each part can be pressed against the substrate m with equal force. Therefore, also in this embodiment, the distribution of the contact surface pressure that the base material m receives from the stamper 35 can be made uniform.
In the present embodiment, the rubber member 5 is an elastic body. The elastic body means an object having a property of recovering to its original state again when the external force is removed when the shape or volume is changed by the external force.

[9. Fifth Embodiment]
FIG. 22 is a cross-sectional view showing a hot press molding apparatus 1D according to this embodiment.
In the fourth embodiment, the rubber member 5 and the temperature adjustment plate 33 are provided separately. However, in this embodiment, as shown in FIG. 22, steam, cooling water, or the like is provided inside the rubber member 5A. water holes 331 heat medium flows is formed, and the rubber member 5 a and the temperature control plate 33 is a first feature that it is formed integrally. In the present embodiment, this can reduce the number of parts.

  Further, in the fourth embodiment, the cooling plate 32 through which a heat medium such as cooling water flows is provided on the back side of the rubber member 5, but in the present embodiment, on the back side of the rubber member 5A. The second feature is that a heat insulating plate 32A formed of a highly heat insulating material such as a heat resistant epoxy resin is provided. In this embodiment, as described above, as a member that insulates heat conduction from the rubber member 5A to the bolster 21 and the slide 22 provided on the back side of the base plate 31, a simple configuration instead of the complicated cooling plate 32 is used. Since the heat insulating plate 32A is used, the manufacturing cost can be reduced. In the present embodiment, the heat insulating plate 32A is a bottom plate provided on the back side of the rubber member 5.

[10. Modification of Embodiment]
It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the fourth embodiment, the rubber member 5 is formed from a single rubber material. In this case, when the rubber member 5 is formed of a rubber material having a low hardness, the rubber member 5 becomes soft during pressurization, and the rubber member enters the slight gap S1 between the temperature control plate 33 and the inner wall of the frame 34. There is a fear. In order to prevent this, the rubber member may be formed by combining rubber materials having different hardnesses.

FIG. 23 is a plan view showing a modified rubber member 5A.
That is, as shown in FIG. 23, a rectangular frame-shaped outer peripheral region 51 of the rubber member 5A is made of, for example, a silicone rubber having a hardness of Shore hardness A70 or higher, and an inner rectangle surrounded by the silicone rubber having a high hardness. The inner region 52 may be made of high heat conductive silicone rubber having low hardness. In this way, by configuring the outer peripheral region 51 of the rubber member 5A with high hardness silicone rubber, the outer edge portion of the rubber member 5A becomes soft at the time of pressurization, and the outer edge portion is connected to the temperature control plate 33 and the inner wall of the frame body 34. Can be prevented from entering the gap S1.

In this modification, a silicone rubber having a low thermal conductivity is used as the rubber member that constitutes the outer peripheral region 51 of the rubber member 5A. Thereby, in the said modification, the heat conduction from the temperature control plate 33 to the frame 34 can be suppressed, and the thermal expansion and thermal contraction of the frame 34 can be suppressed.
Further, instead of configuring the outer peripheral region 51 of the rubber member 5A with high-hardness silicone rubber, an O-ring is provided on the outer side of the rubber member, so that the rubber member has a clearance S1 between the temperature control plate 33 and the inner wall of the frame body 34. You may prevent getting in.

  In the first to third embodiments, the viscous body 43 is housed in the viscous body cartridge 4 and provided in the housing space V1 surrounded by the frame body 34, the temperature control plate 33, and the stamper 35. The viscous body 43 may be provided as it is in the packing provided along the inner wall of the frame body 34 in the accommodation space V1, for example.

  In each of the above embodiments, each of the upper and lower mold parts 3A and 3B includes the heat insulating plate 32A or the temperature control plate 33, the frame body 34, the stamper 35, and the viscous body cartridge 4 or the rubber members 5 and 5A. Only one mold part 3A, 3B may be provided with each member 33, 33A, 34, 35, 4, 5, 5A.

  In each of the above embodiments, the base material m is exemplified by the base material of the light guide plate of the liquid crystal display. However, as the base material, the base material of the diffusion plate of the liquid crystal display and the base material of optical components such as lenses and optical disk substrates. Can also be used.

  The present invention can be used in a hot press molding apparatus.

Sectional drawing which shows the hot press molding apparatus which concerns on 1st Embodiment of this invention. Sectional drawing which expands and shows a part of lower mold part. Sectional drawing of the lower mold part for demonstrating the structure which concerns on a water hole. Sectional drawing which shows the cross section different from FIG. 1 and FIG. 3 of a hot press molding apparatus. Sectional drawing which shows a fixed slider. The top view of a lower mold part. Sectional drawing which shows a viscous body cartridge. The top view which shows a viscous body cartridge. Sectional drawing which shows the compressed viscous body cartridge. The figure for demonstrating the shaping | molding motion of a hot press molding apparatus. The figure which shows the contact surface pressure distribution in the conventional shaping | molding apparatus. The figure which shows the contact surface pressure distribution in the shaping | molding apparatus of the said embodiment. The figure which shows the board thickness distribution of the base material before the press molding in the conventional shaping | molding apparatus. The figure which shows the board thickness distribution of the base material after the press molding in the conventional shaping | molding apparatus. The figure which shows plate | board thickness distribution of the base material before press molding in the shaping | molding apparatus of the said embodiment. The figure which shows the board thickness distribution of the base material after the press molding in the shaping | molding apparatus of the said embodiment . Sectional drawing which shows the hot press molding apparatus which concerns on 2nd Embodiment used as the reference of this invention. The top view of a lower mold part. Sectional drawing which shows the hot press molding apparatus which concerns on 3rd Embodiment used as the reference of this invention. Sectional drawing which shows the hot press molding apparatus which concerns on 4th Embodiment of this invention. The top view of a lower mold part. Sectional drawing which shows the hot press molding apparatus which concerns on 5th Embodiment of this invention. The top view which shows the rubber member of a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A-1D ... Hot press molding apparatus, 2 ... Press apparatus, 3 ... Mold apparatus, 3A ... Lower mold part, 3B ... Upper mold part, 4 ... Viscous cartridge, 5 , 5A ... Rubber member ( Elastic body), 21 ... Bolster, 22 ... Slide, 32A ... Thermal insulation plate (bottom plate), 33 ... Temperature control plate (bottom plate), 34 ... Frame body, 35 ... Stamper (transfer means), 36 ... Spacer, 38 ... Top plate (Transfer means), 41 ... thin plate, 42 ... elastic frame material, 43 ... viscous body, 340 ... opening, 421 ... first elastic frame material, 422 ... second elastic frame material, m ... base material, V1 ... accommodation space .

Claims (8)

A bolster, and a press device provided above the bolster and having a slide that is close to and separated from the bolster;
A lower mold part provided on the bolster and on which a base material is placed, and a mold apparatus having an upper mold part provided on the slide,
At least one of the lower mold part and the upper mold part is
A bottom plate fixed to the bolster or the slide;
A frame that is formed in a frame shape, the bottom plate is installed in the opening, and is slidable in the vertical direction;
A transfer unit that is fixed to the frame and closes the opening, has a predetermined shape pattern on the surface, and thermally transfers the shape pattern to the substrate;
A viscous body provided in a housing space surrounded by the bottom plate, the frame, and the transfer means ;
The outer edge of the viscous body provided in the housing space is larger than the outer edge of the base material,
A spacer having a thickness equal to the thickness of the substrate is disposed outside the substrate,
An inner edge of the spacer is arranged with a slight gap from an outer edge of the base material, and the outer edge of the spacer is arranged outside the outer edge of the viscous body . In the hot press molding apparatus according to claim 1,
A viscous cartridge housed in the housing space,
The viscous cartridge is
Two thin plates,
An elastic frame member provided between the thin plates;
A hot press molding apparatus comprising: the viscous plate provided in a space surrounded by the thin plate and the elastic frame member. In the hot press molding apparatus according to claim 1 or 2 ,
The said press means is comprised with the stamper which is fixed with respect to the said frame, closes the said opening part, and has the said shape pattern on the surface. The hot press molding apparatus characterized by the above-mentioned. In the hot press molding apparatus according to any one of claims 1 to 3 ,
The transfer means includes
A top plate that is fixed to the frame and closes the opening;
A hot press molding apparatus comprising: a stamper provided on the top plate and having the shape pattern on a surface thereof. A bolster, and a press device provided above the bolster and having a slide that is close to and separated from the bolster;
A lower mold part provided on the bolster and on which a base material is placed, and a mold apparatus having an upper mold part provided on the slide,
At least one of the lower mold part and the upper mold part is
A bottom plate fixed to the bolster or the slide;
A frame that is formed in a frame shape, the bottom plate is installed in the opening, and is slidable in the vertical direction;
A stamper fixed to the frame and closing the opening, having a predetermined shape pattern on the surface, and thermally transferring the shape pattern to the substrate;
An elastic body provided in a housing space surrounded by the bottom plate, the frame body, and the stamper ;
The outer edge of the elastic body provided in the housing space is larger than the outer edge of the base material,
A spacer having a thickness equal to the thickness of the substrate is disposed outside the substrate,
An inner edge of the spacer is arranged with a slight gap from an outer edge of the base material, and the outer edge of the spacer is arranged outside the outer edge of the elastic body . Provided on the back side of the transfer means of a hot press molding apparatus that thermally transfers a predetermined shape pattern to the substrate,
Two thin plates,
An elastic frame member provided between the thin plates;
A viscous body provided in a space surrounded by the thin plate and the elastic frame member ,
The elastic frame material is
A first elastic frame member that seals the viscous body and is thicker than the viscous body;
A viscous body cartridge comprising: a second elastic frame member provided outside the first elastic frame member, having a hardness greater than that of the first elastic frame member and having the same thickness as the viscous body. . The viscous cartridge according to claim 6 ,
The viscous material cartridge is characterized in that the viscous material is formed of gel-like or grease-like silicone. The viscous cartridge according to claim 6 or 7 ,
The viscous body is formed of a low melting point metal having a melting point lower than the softening temperature of the base material.