JP2018202740A - Resin mold die and resin mold device - Google Patents

Abstract

To prevent breakage of a workpiece and occurrence of a resin flush.SOLUTION: A resin mold die 10 is a resin mold die which resin-molds a workpiece W on which a plurality of second members Wb are mounted on one first member Wa, and includes a first die 20 provided with a work support part 31 for supporting the workpiece W and a second die 21 provided with a cavity 18 for storing the second member Wb of the workpiece W, where the second die 21 has a plurality of individual movable pieces 23 that expose one end to the bottom of the cavity 18, are movable in a mold opening/closing direction and can abut to each of the second members Wb, a plurality of rods 27 that press and move each of the individual movable pieces 23, a plurality of elastic members 24 that act resilient forces to each of the rods 27, and blocks 11 and 12 for supporting the elastic members 24.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a resin mold for resin-molding a workpiece, and a resin mold apparatus including the resin mold.

  In the resin molding apparatus, a workpiece (molded product) is clamped with a resin mold, and a resin is filled in the cavity while applying resin pressure in this state, and resin molding is performed. Therefore, when filling the cavity with the resin, it is necessary to clamp the workpiece with a sufficient clamping force so that the resin does not leak from the cavity. For this reason, in the resin mold mold, the clamp position of the mold is set in advance according to the thickness of the work, and when the work is clamped, it is clamped by a predetermined clamping force.

  However, when there is a large variation in the workpiece thickness, the clamping force against the workpiece becomes too strong and the workpiece itself is damaged, or the clamping force is insufficient and the resin leaks from the cavity. There may be a problem that flash is generated.

  To solve these problems, the cavity block that clamps the workpiece is made movable in the mold opening and closing direction, a spring is provided on the back of the cavity block, or the cavity block is hydraulically controlled by pushing the workpiece thickness. Technology that absorbs the variation in thickness (see Patent Document 1: Japanese Patent Laid-Open No. 11-58435), and technology that can adjust the clamp position of the mold using a wedge or a screw (Patent Document) 2: JP, 2011-11426, A) etc. are indicated.

JP-A-11-58435 JP 2011-11426 A

  As an example of the above-described prior art, when the workpiece W is a chip exposed package (a package in which the chip Wb on the substrate Wa is exposed), the second mold (upper mold) 21 has an upper surface portion of the chip Wb to be exposed. FIG. 17 shows a configuration example of a resin mold die 90 in which the individual movable piece 23 to be abutted has a float structure and an elastic member (for example, a coil spring) 24 is incorporated therein to make the individual movable piece 23 movable. According to the said structure, the effect which can absorb the dispersion | variation in the height of the chip | tip Wb of the workpiece | work W to some extent is acquired.

  However, when the workpiece W is a multi-row chip exposed package in which a plurality of chips are mounted on a single substrate, the variation in the height of the chips Wb may increase as the number of chips Wb increases. . Further, the variation in the height of the chip Wb in the workpiece W may vary depending on the type of product.

  Furthermore, the purpose of exposing the chip Wb differs depending on the type and function of the product, and there are cases where it is necessary to expose all the chips Wb at the time of sealing, and cases where some flash is allowed. Here, for example, when it is necessary to reliably expose all of the chips Wb, it is conceivable to adjust the thrust of the elastic member 24 incorporated in the movable mechanism of the cavity piece. However, if the thrust (elastic force) of the elastic member 24 is too strong, the tip Wb is damaged, and conversely, if it is too weak, a problem of flashing on the upper surface of the tip Wb is likely to occur. I can't do that.

  The present invention has been made in view of the above circumstances, and in particular, when performing resin molding of a workpiece having a multi-row arrangement in which a plurality of second members are mounted on one first member, the second member is damaged. An object of the present invention is to provide a resin mold and a resin mold apparatus that can prevent the occurrence of resin flash on the exposed surface of the second member.

  The present invention solves the above-mentioned problem by means of solving as described below as an embodiment.

  The resin mold according to the present invention is a resin mold that resin molds a work in which a plurality of second members are mounted on one first member, and is provided with a work support portion that supports the work. And a second mold provided with a cavity for accommodating the second member of the workpiece, wherein the second mold is configured to expose one end portion at the bottom of the cavity and to mold the second mold. A plurality of individual movable pieces that can move in the opening and closing direction and can contact each of the second members, a plurality of rods that respectively push the individual movable pieces, and a resilient force on each of the rods It is necessary to have a plurality of elastic members that act and a block that supports the elastic members.

  According to this, with respect to the work in a multi-row arrangement in which a plurality of second members are mounted on one first member, individual movable pieces that are individually movable by elastic members are arranged on the upper surfaces of the individual second members. Therefore, the variation in the height of each second member can be absorbed by the movement of each individual movable piece. Therefore, when resin molding is performed, it is possible to prevent damage to the workpiece W and prevent resin flash from occurring on the upper surface of the second member of the workpiece W.

  The workpiece has a configuration in which the second member is arranged in a matrix in a predetermined X direction on the mounting surface of the first member and a Y direction perpendicular to the X direction, and the X direction or Y In one direction, the adjacent elastic members are arranged such that some areas overlap in a plan view and do not overlap in a side view perpendicular to the one direction, or the X direction and In the respective directions of the Y direction, it is preferable that the adjacent elastic members are arranged so that a part of the elastic members overlap in a plan view and do not overlap in a side view orthogonal to the respective directions. According to this, in one direction of the X direction or the Y direction, the diameter of the elastic member (coil spring) is obtained using a large-diameter elastic member (coil spring) having strength (spring constant) necessary for design. Individual movable pieces can be arranged at the following pitch. Therefore, the arrangement of individually movable pieces that can be individually moved can be realized.

  Further, the workpiece has a configuration in which the second member is arranged in a matrix in a predetermined X direction on the mounting surface of the first member and a Y direction orthogonal to the X direction, and as the block, Each of the plurality of blocks includes a plurality of blocks, and the elastic members adjacent to each other in one direction of the X direction or the Y direction are arranged in different blocks, or each of the X direction and the Y direction. In this direction, it is preferable that the adjacent elastic members are arranged in different blocks. According to this, in one direction of the X direction or the Y direction, adjacent elastic members do not overlap each other in a partial view in a plan view and in a side view orthogonal to the one direction (that is, in the mold opening / closing direction). It is possible to realize a configuration that is arranged so as not to interfere.

  Further, the workpiece has a configuration in which the second member is arranged in a matrix in a predetermined X direction on the mounting surface of the first member and a Y direction orthogonal to the X direction, and as the block, The elastic member provided corresponding to the second member includes a first block, a second block, a third block, and a fourth block that are separately formed and stacked, and the X direction and Y Even when any four adjacent in the direction are extracted, it is preferable that one each is arranged in the first block, the second block, the third block, and the fourth block. According to this, in both the X direction and the Y direction, adjacent elastic members are partially overlapped in plan view and do not overlap in side view orthogonal to both directions (that is, in the mold opening / closing direction). It is possible to realize a configuration that is arranged so as not to interfere. Therefore, in both the X direction and the Y direction, a large-diameter elastic member (coil spring) having a design-required strength (spring constant) is used and individually movable at a pitch equal to or less than the diameter of the elastic member (coil spring). Pieces can be arranged. In particular, the arrangement of individually movable pieces that can be individually moved can be realized in a minimum space.

  Moreover, it is preferable that the rod has a spherical end formed in contact with the individual movable piece. According to this, according to this, not only the variation in the height of the second member, but also the influence of the inclination on the individual movable piece even when the upper surface (exposed surface) of the second member is inclined. Can be absorbed.

  Moreover, it is preferable that the said elastic member is a coil spring formed using a metal material. According to this, it is possible to realize an elastic member having a strength (spring constant) necessary for design in order to give a resilient force to the individual movable piece in a minimum area (projected area in plan view).

  Moreover, the resin mold apparatus which concerns on this invention makes it a requirement to provide the said resin mold metal mold | die and the film supply mechanism which supplies a release film to the metal mold | die surface of the said resin mold metal mold | die.

  According to this, when performing resin molding of a multi-row array work in which a plurality of second members are mounted on one first member, the individual second member height is increased by using the resin mold die. An effect of absorbing the variation in thickness by the movement of each individual movable piece can be obtained. Furthermore, by using a release film excellent in flexibility supplied to the mold surface of the resin mold, the effect of absorbing the variation in the height of each second member by the thickness of the release film can be obtained. These synergistic effects make it possible to absorb even when the variation in the height of the second member is even greater.

  According to the present invention, in particular, when performing resin molding of a workpiece having a multi-row arrangement in which a plurality of second members (for example, chips) are mounted on one first member (for example, a substrate), the second member is formed. Can be prevented. In addition, it is possible to prevent the resin flash from occurring on the exposed surface of the second member.

It is the schematic (plan view) which shows the example of the resin mold apparatus provided with the resin mold metal mold | die which concerns on 1st embodiment of this invention. It is the schematic (front sectional drawing) which shows the example of the resin mold metal mold | die which concerns on 1st embodiment of this invention, and is explanatory drawing of resin mold operation | movement. It is the schematic (front sectional drawing) which shows the example of the resin mold metal mold | die which concerns on 1st embodiment of this invention, and is explanatory drawing of the resin mold operation | movement following FIG. It is the schematic (front sectional drawing) which shows the example of the resin mold metal mold | die which concerns on 1st embodiment of this invention, and is explanatory drawing of the resin mold operation | movement following FIG. It is the schematic (front sectional drawing) which shows the example of the resin mold metal mold | die which concerns on 1st embodiment of this invention, and is explanatory drawing of the resin mold operation | movement following FIG. It is the VI-VI sectional view taken on the line in FIG. It is the schematic (front sectional drawing) which shows the example of the mechanism which adsorb | sucks a release film to a 2nd metal mold | die (upper mold) in the resin mold metal mold | die of FIG. It is the schematic (front sectional drawing) which shows the other example of the resin mold metal mold | die of FIG. It is the schematic (front sectional drawing) which shows the other example of the resin mold metal mold | die of FIG. It is the schematic (plan view) which shows the example of the resin mold metal mold | die which concerns on 2nd embodiment of this invention (only an individual movable piece and an elastic member are shown in figure). It is the XI-XI sectional view taken on the line in FIG. It is the XII-XII sectional view taken on the line in FIG. It is the schematic (front sectional drawing) which shows the example of the individual movable piece and rod of the resin mold metal mold | die which concern on 1st embodiment and 2nd embodiment of this invention. It is the schematic (perspective view) which shows the example of the workpiece | work with which the several 2nd member was mounted in one 1st member. It is the XV part enlarged view in FIG. It is the schematic (plan view) which shows the example of the elastic member of the resin mold metal mold | die which concerns on 2nd embodiment of this invention. It is the schematic (front sectional drawing) which shows the example of the resin mold metal mold | die which concerns on the conventional embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view (plan view) illustrating an example of a resin mold apparatus 100 including a resin mold 10 according to the first embodiment of the present invention. 2 to 5 are schematic views (front sectional views) illustrating an example of the resin mold 10 according to the first embodiment of the present invention (these drawings are also used as operation explanatory views). Here, for convenience of explanation, the vertical direction in the resin mold 10 may be described by the top and bottom of the drawing in each drawing. Further, a predetermined X direction and a Y direction orthogonal to the X direction are indicated by arrows. In all the drawings for explaining the embodiments, members having the same function are denoted by the same reference numerals, and repeated description thereof may be omitted.

  The resin molding apparatus 100 according to the present embodiment is an apparatus that performs resin molding of a workpiece (molded product) W. Hereinafter, as the resin molding apparatus 100, a first mold (lower mold) 20 provided with a pot 35 in which a mold resin (sometimes simply referred to as “resin”) is accommodated, and a second member Wb of the workpiece W are provided. A transfer molding apparatus including a resin mold 10 having a second mold (upper mold) 21 provided with a cavity 18 to be accommodated will be described as an example. May be.

  First, the workpiece W to be formed has a configuration in which the second member Wb is mounted on the first member Wa. More specifically, examples of the first member Wa include various plate-shaped members such as a resin substrate, a ceramic substrate, a metal substrate, a lead frame, a carrier, and a wafer formed in a strip shape. Examples of the second member Wb include various members such as a semiconductor chip (sometimes simply referred to as “chip”), a MEMS chip, a passive element, a heat sink, and a plate-like member for wiring and heat dissipation. (Hereinafter, these may be referred to as “chips”). In other words, the workpiece W has a configuration in which the second member Wb is mounted on the first member Wa (flip chip mounting, wire bonding mounting, etc.) and overlapped. A description will be given by taking as an example a workpiece W having a multi-row arrangement in which a plurality of second members Wb are mounted on one member Wa by a flip chip mounting method. More specifically, as shown in FIG. 14, the workpiece W includes a second member Wb arranged in a matrix in a predetermined X direction on the mounting surface of the first member Wa and a Y direction orthogonal to the X direction. It has a configuration arranged in rows and m columns (one of n and m is an integer of 2 or more). As the second member Wb, as shown in the figure, one chip or the like may be arranged in n rows and m columns, or a plurality of chips or the like arranged in a predetermined array is regarded as one region. It may be arranged in rows and m columns.

  Then, the outline | summary of the resin mold apparatus 100 is demonstrated. As shown in FIG. 1, the resin molding apparatus 100 includes a workpiece supply unit 100A for supplying a workpiece W, a preheating unit 100B for preheating the workpiece W, a press unit 100C for resin molding the workpiece W, and a molded product Wp after the resin molding. A molded product storage unit 100D for storage and a transport mechanism 100E are provided.

  First, the workpiece supply unit 100A includes a stocker 102 that stores a magazine (not shown) that stores workpieces W. The workpieces W sent from each magazine by a pusher (not shown) are arranged facing the set table 104 in pairs, for example.

  A tablet supply unit 106 for supplying mold resin (for example, resin tablet T) is provided on the side of the set table 104. The workpiece W on the set table 104 is held by a loader 122 of a transfer mechanism 100E described later and transferred to the preheating unit 100B. Further, the resin tablet T of the tablet supply unit 106 is held by the loader 122 and transferred to the press unit 100C.

  Next, the preheating unit 100B includes a heater block 108 that preheats the workpiece W. The workpiece W transferred from the workpiece supply unit 100A by the transport mechanism 100E (loader 122) is placed on the heater block 108 and heated (preheated) to a predetermined temperature in that state. The preheated workpiece W is held by the loader 122 of the transport mechanism 100E and transferred to the press unit 100C.

  Next, the press unit 100C includes a press device 110 that clamps and pre-heats a work W that has been preheated by opening and closing a resin mold 10 that will be described later. The press device 110 is a known mold-clamping mechanism that pushes the resin mold 10 in the mold opening / closing direction, and a known transfer drive that fills the cavity 18 with the resin melted in the pot 35 of the resin mold 10. It has a mechanism.

  In the present embodiment, the mold surface (resin mold surface) of the resin mold 10 is covered with the release film F and resin molded. Therefore, the press device 110 includes a film supply mechanism 112 that supplies the release film F to the mold surface of the resin mold 10. The film supply mechanism 112 includes a supply roll 112 a that supplies the release film F to the mold surface (upper mold surface) and a take-up roll 112 b that winds the release film F on both sides of the resin mold 10. For the release film F, a film material excellent in heat resistance, ease of peeling, flexibility, and extensibility, for example, PTFE, ETFE, PET, FEP, fluorine-impregnated glass cloth, polypropylene, polyvinylidine chloride and the like is preferable. Used. However, the mold surface of the resin mold 10 may not be covered with the release film F.

  Next, the molded product storage unit 100D includes a set unit 114 for setting a molded product Wp after resin molding, a gate break unit 116 for removing unnecessary resin such as a gate from the molded product Wp, and a molded product Wp from which unnecessary resin has been removed. Is provided. The molded product Wp is stored in a storage magazine 120, and the magazine 120 in which the molded product is stored is sequentially stored in a stocker 118.

  Next, the transport mechanism 100E includes a loader 122 that carries the workpiece W into the press unit 100C and an unloader 124 that carries the molded product Wp out of the press unit 100C. In the workpiece supply unit 100A, the preheating unit 100B, the press unit 100C, and the molded product storage unit 100D, the resin mold apparatus 100 is assembled by connecting the unitized stands. Guide units 126 are provided on the back side of each unit, and a guide rail is formed by assembling the guide units 126 so as to be linearly connected. Each of the loader 122 and the unloader 124 is provided so as to be linearly movable back and forth along a guide rail from a predetermined position on the guide portion 126 toward the workpiece supply portion 100A, the preheating portion 100B, the press portion 100C, and the molded product storage portion 100D. It has been.

  Therefore, by changing the configuration of the unit, the configuration mode of the resin mold apparatus 100 can be changed while maintaining the state where the guide portions 126 are connected to each other. For example, the configuration shown in FIG. 1 is an example in which two press devices 110 are installed, but it is also possible to configure a resin molding device (not shown) in which a single press device or a plurality of three or more press devices 110 are connected. It is.

  Then, the structure of the resin mold metal mold | die 10 with which the resin mold apparatus 100 is provided is demonstrated.

  Schematic diagrams (front sectional views) of the resin mold 10 according to the present embodiment are shown in FIGS. 2 to 5 (these drawings are also used as operation explanatory diagrams). As described above, the resin mold 10 includes the first mold (lower mold) 20 and the second mold (upper mold) 21. In addition, although the case where the first mold (lower mold) 20 is a movable mold and the second mold (upper mold) 21 is a fixed mold will be described as an example, the present invention is not limited to this configuration.

  First, the first mold (lower mold) 20 will be described. As shown in FIG. 2, the first mold (lower mold) 20 includes a drive transmission mechanism (link mechanism such as a toggle link or a screw shaft) driven by a drive source (electric motor), and a chase (lower The mold is opened and closed by a known mold clamping mechanism that raises and lowers the lower mold movable platen on which the mold chase 33 is placed. In addition, the raising / lowering operation | movement of the 1st metal mold | die (lower mold | type) 20 can set arbitrarily a moving speed, pressurizing force, etc.

  The first mold (lower mold) 20 has a configuration in which an insert (lower mold insert) 19 and a block (fifth block 15) are fixedly supported by a chase (lower mold chase) 33.

  On the upper surface of the first mold (lower mold) 20 (here, the fifth block 15), a work support portion 31 on which the work W (first member Wa side) is placed is provided. As an example, a plurality of workpiece support portions 31 are provided so that a plurality of workpieces W can be placed thereon.

  The first mold (lower mold) 20 (here, lower mold insert 19) is provided with a cylindrical pot 35 in which a mold resin (here, resin tablet T) is loaded. The upper end surface of the lower mold insert 19 is formed flush with the upper end surface of the pot 35. A plunger 36 that moves up and down by a known transfer drive mechanism is provided in the pot 35. As an example, the plunger 36 employs a multi-plunger structure in which a plurality of plungers 36 are provided on a support block (not shown) corresponding to the plurality of pots 35. An elastic member (not shown) is provided on the support portion of each plunger 36, and each plunger 36 is slightly displaced by the elastic force of the elastic member to release an excessive pressing force, and at the time of holding the pressure of the resin tablet T. It is possible to adapt to variations in the amount of resin. The plunger 36 is not driven by a known transfer drive mechanism, but is moved up and down in conjunction with mold closing to pressurize the mold resin supplied in the pot 35 or a predetermined mold resin storage area. It is good also as a structure which can be shape | molded.

  Next, the second mold (upper mold) 21 will be described. As shown in FIG. 2, the second mold (upper mold) 21 has a configuration in which an insert (upper mold insert) 17 and a block are fixedly supported by a chase (upper mold chase) 22. The block according to the present embodiment has a configuration in which a plurality of blocks formed as separate bodies (for example, the first block 11 and the second block 12 from the bottom) are stacked.

  Here, the cavity 18 is provided in the block (first block 11), and further, resin flow paths such as an upper mold cull 17 a and an upper mold runner 17 b communicating with the cavity 18 are connected to the upper mold insert 17 and the block ( It is provided in the first block 11).

  Further, the second mold (upper mold) 21 has one end (here, the lower end) exposed at the bottom of the cavity 18 and is movable in the mold opening / closing direction, and one-to-one with each second member Wb. A plurality of individual movable pieces 23 (23A and 23B in the present embodiment) that can come into contact with each other, and a plurality of rods 27 (27A and 27B in the present embodiment) that push the individual movable pieces 23 one to one. And a plurality of elastic members 24 (in this embodiment, 24A and 24B) that apply elastic force to the rods 27 on a one-on-one basis. More specifically, a relatively small-diameter rod 27 is disposed so as to pass through the gaps between the elastic members 24, the individual movable pieces 23 and the elastic members 24 are connected, and the individual movable pieces 23 are connected to the elastic members 24. It is configured to transmit the elasticity of. In the present embodiment, the support plate 28 is interposed between the rod 27 and the elastic member 24 and fixed. The elastic member 24 is a spring (coil spring) formed using a metal material. As described above, the same number of sets of the individual movable pieces 23, the rods 27, and the elastic members 24 are provided for each second member Wb so as to correspond one-to-one.

  Here, as a characteristic configuration of the present embodiment, adjacent elastic members 24 are arranged in different blocks in one direction of the X direction or the Y direction (described in the example of the X direction in FIG. 2). Yes. That is, the elastic member 24A corresponding to the individual movable piece 23A is supported by the first block 11 and is covered by the upper second block 12, and the elastic member 24B corresponding to the individual movable piece 23B is The upper block is supported by the two blocks 12 and is covered with an upper chase 22 in the upper layer. In other words, the adjacent elastic members 24A and 24B are arranged and accommodated at different height positions in the mold. As described above, in this embodiment, the elastic members 24A and 24B are accommodated and assembled while the first block 11 and the second block 12 are stacked, so that the elastic members 24A and 24B are accommodated at different heights. The second mold (upper mold) 21 having the above structure can be manufactured.

  As described above, in a multi-row array chip exposed package in which a plurality of second members Wb (chips) are mounted on one first member Wa (substrate), an elastic member is provided on the upper surface of each exposed second member Wb. It is desirable that the individual movable pieces 23 that are individually movable by 24 are arranged so that the variation in the height of each second member Wb is absorbed by the movement of the individual movable pieces 23. However, when the pitch of the second member Wb arrangement is equal to or smaller than the diameter of the elastic member (here, the coil spring), the adjacent elastic members 24 interfere with each other when trying to make the movable structure 23 movable. There is a restriction that each component arrangement that allows individual movement cannot be established, and the entire cavity must be movable integrally. Due to this, if the individual movable piece 23 has an integral structure, variations in the height of the individual second member Wb cannot be absorbed. For this reason, if the variation is large, the second member Wb having a high height is pressed too hard at a certain place and the second member Wb is damaged, or the second member Wb having a low height at a certain place. It is conceivable that the exposed surface of the second member Wb is too weak to cause a resin flash on the upper surface (exposed surface) of the second member Wb.

  In addition, by using the release film F excellent in flexibility, it is possible to exhibit the function of absorbing the variation in the height of the second member Wb to some extent by its elasticity and pressing the exposed surface of the second member Wb. However, when the variation in the height of the second member Wb exceeds the thickness of the release film F, the variation in the release film F cannot be absorbed, and it is necessary to increase the thickness of the release film F, which increases the production cost. I could invite you.

  With respect to these problems, according to the above configuration, a multistage structure in which the adjacent elastic members 24 are arranged in different blocks (in the present embodiment, the first block 11 and the second block 12) can be realized. That is, in one direction of the X direction or the Y direction (here, the X direction), the adjacent elastic members 24 do not overlap with each other when viewed in a side view perpendicular to the one direction. , So as not to interfere in the mold opening / closing direction). Accordingly, the individual movable pieces 23 can be arranged at an extremely narrow pitch that is equal to or smaller than the diameter of the elastic member (here, the coil spring) 24, so that the elastic member 24 having a relatively large diameter can be used. As a result, a structure in which the individual movable pieces 23 individually movable by the elastic members 24 are arranged on the upper surfaces of the individual second members Wb to be exposed by the elastic members 24 having the elastic force (here, the spring constant) necessary for the design. This makes it possible to solve the above problems.

  The rod 27 connected to the elastic member 24 and the support plate 28 to push the individual movable piece 23 has a structure in which the curved tip is pressed against the cavity piece 23 as shown in FIG. It is preferable to do this. For example, it is preferable that the end 27a that contacts the individual movable piece 23 is formed in a spherical shape. According to this, not only the variation in the height of the second member Wb but also the case where the upper surface (exposed surface) of the second member Wb is inclined, Therefore, the influence exerted by the inclination of the second member Wb can be absorbed.

  In addition, the cavity 18 is generally configured in a Y-direction space similar to the X-direction space in FIG. However, the present invention is not limited to this. For example, the space in the Y direction is recessed for each individual movable piece 23 corresponding to each second member Wb as shown in FIG. 6 (sectional view taken along line VI-VI in FIG. 2). It is good also as a structure which the 1st block 11 between the adjacent recessed parts in a Y direction contact | abuts to the 1st member Wa. For example, as shown in FIG. 15 (enlarged view of the XV part in FIG. 14), the first member Wa has a terminal Wa1 on the upper surface, and the second member Wb has a light emitting spot Wb1 on the upper surface, In the case where it is necessary to expose both Wa1 and Wb1, it is difficult to adjust the height so that both Wa1 and Wb1 are exposed in a structure in which the entire block constituting the cavity is integrally movable. It was difficult to expose multiple positions at different heights. However, according to the configuration shown in FIG. 6, as shown in FIG. 15, a resin mold capable of realizing the configuration in which both Wa1 and Wb1 provided at different heights are exposed is possible.

  Next, the opening / closing operation accompanying the resin molding operation of the resin mold 10 will be described with reference to FIGS.

  First, as shown in FIG. 2, the work W is supplied to the first mold (lower mold) 20 of the resin mold 10 that has been opened by a loader 122 (see FIG. 1). Further, the release film F is supplied between the second mold (upper mold) and the first mold (lower mold) (above the workpiece W) by the film supply mechanism 112. Further, the resin tablet T is loaded in the pot 35.

  Here, the example of the structure which makes the release film F adsorb | suck to the 2nd metal mold | die (upper mold | type) 21 is demonstrated using FIG. First, each individual movable piece 23 (23A, 23B) is slidably inserted into each through hole 11a formed in the first block 11, and a downward movement limit is set by the step portion 11b. . In order to assemble the individual movable piece 23 (23A, 23B) in the through hole 11a, the first block 11 may be formed by a laminated structure of the first block lower step portion 11A and the first block upper step portion 11B. The first block 11 (first block lower step portion 11A) is provided with a suction channel 11c that communicates with each through hole 11a and is connected to an external pressure reducing mechanism (not shown). . According to this configuration, since the inside of the through hole 11a is decompressed by driving the decompression mechanism to decompress the suction channel 11c, the outer periphery of the individual movable piece 23 (23A, 23B) and the inner periphery of the through hole 11a The air in the cavity 18 is sucked through the gap, and an action of adsorbing the release film F on the mold surface of the second mold (upper mold) 21 can be obtained. For simplification of the drawings, the release film F is not shown in FIGS. 2 to 6 and FIGS. 8 to 12, and the first block lower step portion 11A and the first block upper step portion 11B Are collectively displayed in the first block 11.

  Next, as shown in FIG. 3, the first mold (lower mold) 20 is raised. At this time, if there is a variation in the height of the second member Wb of the workpiece W, the individual movable pieces 23 (23A, 23B) provided corresponding to the respective second members Wb are separated from the second member Wb having a high height. The contact starts in sequence. At this time, the individual movable piece 23 (23A, 23B) in contact with the second member Wb moves in the mold opening / closing direction (upward here) while receiving the elastic force of the elastic member 24 (24A, 24B).

  Next, as shown in FIG. 4, the first mold (lower mold) 20 is further raised to close the resin mold 10. At this time, the first mold (lower mold) 20 abuts on the second mold (upper mold) 21, and a closed space (cavity 18, upper mold cull 17a, upper mold runner 17b, etc.) is formed therebetween. Is done. The closed space is depressurized by a depressurization mechanism (not shown). In addition, before making both metal mold | die 20 and 21 contact | abut, you may comprise a closed space by the seal ring provided between these, and you may pressure-reduce.

  Here, when the height of the second member Wb of the workpiece W varies as a whole due to variations in the thickness of the bumps or the like, as shown exaggeratedly in FIG. 3 or the like, each second member Wb is subjected to a mold closing process. Correspondingly provided individual movable pieces 23 (23A, 23B) sequentially come into contact with the second member Wb. For example, in the example shown in the figure, since the thickness of the bump of the second member Wb from the right is the thickest, the upper surface of the second member Wb is at the highest position. Will be in touch. In this manner, the corresponding elastic members 24 (24A, 24B) are contracted by sequentially abutting from the high second member Wb, so that the individual movable pieces 23 (23A, 23B) are related to the elastic members 24 (24A). , 24B), it is possible to obtain an action of individually moving the optimum amount in the mold opening / closing direction (upward here) while receiving the elastic force. Therefore, since the height variation for each second member Wb can be individually absorbed and the clamping operation can be performed with an appropriate force, damage due to excessive clamping force can be prevented. Incidentally, since the material of the release film F itself is also elastic, the effect of further absorbing the height variation of the second member Wb can be obtained. By using these variation absorbing functions in combination, the height of the second member Wb can be increased. Appropriate clamping can be performed even if the length varies greatly.

  Next, as shown in FIG. 5, the transfer driving mechanism is operated to push the plunger 36 in the direction of the second mold (upper mold) 21 to melt the mold resin into the upper mold cal 17a and the upper mold runner. It pumps to the cavity 18 through 17b. At this time, the upper surface of each second member Wb of the workpiece W is pressed and pressed in close contact with the corresponding individual movable piece 23 (23A, 23B) through the release film F with an optimum force. Therefore, it is possible to reliably prevent the resin flush from occurring on the upper surface (exposed surface) of the second member Wb due to insufficient clamping force while preventing damage to the workpiece W due to excessive clamping force.

  As described above, conventionally, when an individual movable piece individually movable by an elastic member is arranged on the upper surface of each second member Wb in the workpiece W, an elastic member (coil spring) having strength (spring constant) necessary for design. It was impossible to arrange the individual movable pieces at a pitch equal to or smaller than the diameter. On the other hand, it has been technically impossible (difficult) to reduce the diameter of an elastic member (coil spring) having strength (spring constant) necessary for design. That is, prevention of breakage of the workpiece W and prevention of flashing of the exposed surface during resin molding and narrowing of the pitch of the second member Wb mounted on the first member Wa of the workpiece W are contradictory issues. On the other hand, according to this embodiment, a pitch smaller than the diameter of the elastic member (coil spring) 24 using a large-diameter elastic member (coil spring) 24 having a strength (spring constant) necessary for design. Thus, the individual movable pieces 23 can be arranged. Accordingly, the individual movable piece 23 that can be individually moved can be installed, the workpiece W can be prevented from being damaged during resin molding, the resin flush can be prevented from occurring on the exposed surface, and the second member Wb mounted on the first member Wa of the workpiece W. It is possible to achieve both a narrow pitch. That is, by reducing the pitch of the second member Wb while reducing the incidence of defective products (damage, flash), the use area of the first member Wa and the waste of the mold resin are eliminated, and more molded products can be obtained. It has great technical significance in that it can.

  In the first embodiment, the work W in which the semiconductor chip is mounted on the first member Wa (substrate) as the second member Wb by the flip chip mounting method is described as an example. It is not limited. As a modified example of the workpiece W, a sealed object such as the image sensor illustrated in FIG. 8, that is, the second member Wb (image sensor element) is mounted on the first member Wa (substrate) by wire bond connection, Even when the cover glass (transparent member) Wc is placed thereon, the resin molding can be suitably performed. That is, if the individual movable piece 23 having a slightly larger area of the contact portion than the upper surface of the cover glass Wc is provided and brought into contact, the cover glass can be prevented from being damaged, and the cover glass Generation | occurrence | production of the state (resin flash) on which resin is mounted can be prevented (By the way, the problem-solving means of this invention is applied by taking cover glass Wc as a part of member which comprises the 2nd member Wb).

  Furthermore, as another modification of the workpiece W, it is a case in which a resin molded portion is molded on both surfaces (upper and lower surfaces) of the first member Wa (substrate) illustrated in FIG. In the case where it is necessary to provide an exposed portion, the configuration of the second mold (upper mold) 21 described above is similarly provided to the first mold (lower mold) 20, It is possible to perform resin molding suitably. That is, in the second mold (upper mold) 21, the first block 11 and the second block 12 are provided with individual movable pieces 23A and 23B, elastic members 24A and 24B, rods 27A and 27B, and support plates 28A and 28B. In the same manner as (symmetric with respect to the mold opening / closing direction), in the first mold (lower mold) 20, the individual movable pieces 23E and 23F are elastically mounted on the fifth block 15 and the sixth block 16 stacked on the lower mold chase 33. The members 24E and 24F, the rods 27E and 27F, and the support plates 28E and 28F are provided.

(Second embodiment)
Next, the resin mold 40 according to the second embodiment of the present invention will be described. The resin mold 40 according to the present embodiment has the same basic configuration as the resin mold 10 according to the first embodiment described above, but in particular, the configuration of the second mold (upper mold) 21. Is different. Hereinafter, the present embodiment will be described focusing on the difference.

  A schematic view (front sectional view) of a resin mold 40 according to the present embodiment is shown in FIGS. Here, FIG. 10 is a plan view of the main part of the resin mold 40, and only the individual movable pieces 23 (23A to 23D) and the elastic members 24 (24A to 24D) are illustrated to clarify their arrangement. ing. 11 is a cross-sectional view of the main part of the resin mold 40 (cross-sectional view taken along the line XI-XI in FIG. 10), and is a view seen in a side view orthogonal to the X direction. FIG. 12 is a cross-sectional view of the main part of the resin mold 40 (cross-sectional view taken along the line XII-XII in FIG. 10), and is a view seen in a side view orthogonal to the Y direction. In FIG. 11, the individual movable pieces 23C and 23D, the elastic members 24C and 24D, the rods 27C and 27D, and the support plates 28C and 28D in the adjacent rear row are displayed with broken lines, and are displayed with an offset slightly in the left-right direction. Thus, the arrangement of each component (particularly the positional relationship in the mold opening / closing direction) is clarified. Similarly, in FIG. 12, the individual movable pieces 23A and 23D, the elastic members 24A and 24D, the rods 27A and 27D, and the support plates 28A and 28D in the adjacent rear row are displayed with broken lines and offset slightly in the left-right direction from the actual one. By doing so, the arrangement of each component (particularly the positional relationship in the mold opening / closing direction) is clarified. Further, in FIGS. 11 and 12, the hatching of the first block 11, the second block 12, the third block 13, and the fourth block 14 is not displayed for easy understanding of the drawings.

  As shown in FIGS. 10 to 12, the resin mold 40 according to the present embodiment includes an insert (upper mold insert) 17 in a chase (upper chase) 22 in a second mold (upper mold) 21. And the block is provided with the structure supported by the rigid body shape. In the block according to the present embodiment, a plurality of blocks formed as separate bodies (for example, four blocks of the first block 11, the second block 12, the third block 13, and the fourth block 14 from the bottom) are stacked. It has a configuration. The resin flow paths such as the cavity 18, the upper mold cull 17a, and the upper mold runner 17b have the same configuration as that of the first embodiment.

  Further, in the second mold (upper mold) 21, a plurality of individual movable pieces 23 (in the present embodiment, 23A, 23B, 23C, and the like) that can contact each second member Wb in the cavity 18 on a one-to-one basis. 23D), a plurality of rods 27 (in this embodiment, 27A, 27B, 27C, and 27D) that push each individual movable piece 23 in a one-to-one relationship, and each rod 27 has a one-to-one elastic force. A plurality of elastic members (coil springs) 24 (24A, 24B, 24C, 24D in the present embodiment) to be acted are provided.

  Here, as a characteristic configuration of the present embodiment, blocks in which the adjacent elastic members 24 are different from each other in the X direction and the Y direction (see FIGS. 10 to 12) (the first block in the present embodiment). 11, the second block 12, the third block 13, and the fourth block 14). That is, the elastic member 24C corresponding to the individual movable piece 23C is supported by the first block 11 and covered with the second block 12 of the upper layer, and the elastic member 24D corresponding to the individual movable piece 23D is the first one. The elastic member 24A is supported by the second block 12 and covered by the upper third block 13, and the elastic member 24A corresponding to the individual movable piece 23A is supported by the third block 13 and the upper fourth block 14. The elastic member 24B corresponding to the individual movable piece 23B is supported by the fourth block 14 and is covered by the upper chase 22 of the upper layer.

  In this way, a multistage structure in which the adjacent elastic members 24 are arranged in different blocks (in this embodiment, the first block 11, the second block 12, the third block 13, and the fourth block 14) can be realized. That is, in each of the X direction and the Y direction, adjacent elastic members 24 do not overlap each other in a partial view in a plan view and in a side view perpendicular to the respective directions (that is, interference in the mold opening / closing direction). (Not to be arranged) can be realized. Therefore, the individual movable pieces 23 can be arranged at a pitch equal to or less than the diameter of the elastic member (here, the coil spring) 24, so that the relative diameter of the elastic force (here, the spring constant) necessary for design is provided. It is possible to use the elastic member 24 having a large value. As a result, it is possible to realize a structure in which the individual movable pieces 23 that are individually movable by the elastic members 24 are arranged on the upper surfaces of the individual second members Wb to be exposed, and the above-described problems can be solved.

  In particular, in the present embodiment, regarding the elastic member 24 provided corresponding to the second member Wb, even if any four adjacent in the X direction and the Y direction are extracted, the first block 11 and the second block 11 respectively. A configuration in which one block is arranged at each of the block 12, the third block 13, and the fourth block 14 is realized. That is, these four elastic members 24 are arranged in different blocks 11, 12, 13, and 14. At this time, as shown in FIG. 16, the four adjacent elastic members 24, 24, 24, 24 can be arranged such that a part of the regions overlap in plan view. Accordingly, since the interval between the adjacent individual movable pieces 23 can be further reduced in both the X direction and the Y direction, a plurality of second members Wb are mounted on one first member Wa (substrate). In the multi-row array of workpieces W, the interval between the adjacent second members Wb can be further reduced in both the X direction and the Y direction. As described above, the pitch of the second member Wb can be further reduced as compared with the first embodiment, and the use area of the first member Wa and the waste of the mold resin can be further reduced to obtain more molded products. Can be obtained. Thereby, the production cost of a molded product can also be reduced.

  The basic resin molding operation in the resin molding die 40 is the same as that of the resin molding die 10 according to the first embodiment described above, and a description thereof will be omitted.

  As described above, according to the resin mold and the resin molding apparatus according to the present invention, the elastic member (coil spring) having a large strength (spring constant) necessary for design is used. The individual movable pieces can be arranged at a pitch equal to or less than the diameter of the coil spring. In other words, since individual movable pieces that can be individually moved can be arranged, it is possible to achieve both prevention of workpiece damage and exposure surface flushing during resin molding and narrowing of the pitch of the second member mounted on the first member of the workpiece. It becomes possible to do. Therefore, by reducing the pitch of the second member while reducing the incidence of defective products (damage, flash), it is possible to obtain more molded products by eliminating the use area of the first member and the waste of the mold resin. .

  The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the present invention. For example, it is good also as a compression molding die structure which turned the structure as shown in FIGS. 2-6 upside down. In this case, a mold resin pressure region may be provided in a part of the cavity, and the resin may be filled after the second member Wb is clamped.

10, 40, 90 Resin mold 11 First block 12 Second block 13 Third block 14 Fourth block 15 Fifth block 16 Sixth block 17 Insert (upper mold insert)
18 Cavity 19 Insert (Lower mold insert)
20 First mold (lower mold)
21 Second mold (upper mold)
22 Chase (upper chase)
23, 23A, 23B, 23C, 23D, 23E, 23F Individual movable piece 24, 24A, 24B, 24C, 24D, 24E, 24F Elastic member 27, 27A, 27B, 27C, 27D, 27E, 27F Rod 28, 28A, 28B , 28C, 28D, 28E, 28F Support plate 31 Work support 33 Chase (lower chase)
35 Pot 36 Plunger 100 Resin mold device 102 Stocker 104 Set stand 106 Tablet supply unit 108 Heater block 110 Press device 112 Film supply mechanism 114 Set unit 116 Gate break unit 118 Stocker 120 Magazine 122 Loader 124 Unloader 126 Guide unit F Release film T Resin Tablet W Work Wa First member Wb Second member Wp Molded product

Claims (7)

A resin mold for resin molding a work in which a plurality of second members are mounted on one first member,
A first mold provided with a workpiece support portion for supporting the workpiece;
A second mold provided with a cavity for accommodating the second member of the workpiece,
The second mold has a plurality of individual movable pieces that have one end exposed at the bottom of the cavity, are movable in the mold opening / closing direction, and can be brought into contact with the second members, and the individual movable pieces. A resin mold comprising: a plurality of rods that respectively push the plurality of rods; a plurality of elastic members that respectively apply a resilient force to each of the rods; and a block that supports the elastic members. Mold. The workpiece has a configuration in which the second members are arranged in a matrix in a predetermined X direction on the mounting surface of the first member and a Y direction orthogonal to the X direction.
In one direction of the X direction or the Y direction, the adjacent elastic members are arranged so that a part of the elastic members overlap in a plan view and do not overlap in a side view orthogonal to the one direction, Alternatively, in each of the X direction and the Y direction, the adjacent elastic members are arranged such that a part of the elastic members overlap in a plan view and do not overlap in a side view orthogonal to the respective directions. The resin mold according to claim 1. The workpiece has a configuration in which the second members are arranged in a matrix in a predetermined X direction on the mounting surface of the first member and a Y direction orthogonal to the X direction.
Each of the blocks includes a plurality of blocks,
The elastic members adjacent to each other in the X direction and the Y direction are arranged in different blocks in the X direction or the Y direction, or in the X direction and the Y direction. 2. The resin mold according to claim 1, wherein the members are arranged in the different blocks. The workpiece has a configuration in which the second members are arranged in a matrix in a predetermined X direction on the mounting surface of the first member and a Y direction orthogonal to the X direction.
As the block, comprising a first block, a second block, a third block, and a fourth block that are separately formed and stacked,
The elastic members provided corresponding to the second members are the first block, the second block, and the third block, respectively, even when any four adjacent in the X direction and the Y direction are extracted The resin mold according to claim 1, wherein one block is provided for each of the blocks and the fourth block. The resin mold die according to any one of claims 1 to 4, wherein the rod has a spherical end formed in contact with the individual movable piece. The resin mold mold according to claim 1, wherein the elastic member is a coil spring formed using a metal material. A resin mold according to any one of claims 1 to 6;
And a film supply mechanism for supplying a release film to the mold surface of the resin mold.

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