JP2014175500A - Resin sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin sealing device which stably and smoothly puts resins from a hopper into a resin alignment section of a resin supply unit.SOLUTION: A resin sealing device 100 includes a resin supply unit 120 including a hopper 122 which stores tablet shape resins 104 and a ball feeder 132 which aligns the resins 104 put in by the hopper 122. The resin supply unit 120 includes: a sensor 134 which detects an amount of the resins 104 existing in the ball feeder 132; a shutter part 126 which forms an opening of the hopper 122 and limits an amount of the resins 104 to be put into the ball feeder 132; and a control part 136 which controls an amount of an opening of the hopper 122, which is adjusted by the shutter part 126, on the basis of the output of the sensor 134.

Description

  The present invention relates to a resin sealing device.

  Conventionally, a resin sealing device as shown in Patent Document 1 has been used. This resin sealing apparatus employs a sealing technique called transfer molding. This melts the tablet-shaped resin placed in the lower mold pot of the mold, and flows (pushes) the melted resin through the runner and gate into the cavity where the substrate is placed. It has the advantage that many substrates can be sealed. The resin used in such a resin sealing device is arranged in a resin supply unit provided in the resin sealing device and is put into a mold.

JP 2007-287925 A

  An example of a specific configuration of the resin supply unit includes a hopper in which tablet-shaped resin is stored and a ball feeder (an example of a resin alignment unit) that aligns the resin charged from the hopper. However, with such a configuration, even if an attempt is made to add resin from the hopper to the ball feeder without excess or deficiency, conventionally, it is difficult to appropriately do so, for example, the phenomenon that the tablet-shaped resin stagnates along the path to the ball feeder It was happening.

  Accordingly, the present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a resin sealing device capable of stably charging resin from a hopper without stagnation in a resin alignment portion of a resin supply unit. .

  The present invention is a resin sealing device comprising a resin supply unit having a hopper in which tablet-shaped resin is stored and a resin alignment unit that aligns the resin charged from the hopper, the resin supply unit Includes a detection unit that detects the amount of the resin present in the resin alignment unit, a shutter unit that constitutes an opening of the hopper and can limit the amount of the resin to be input to the resin alignment unit, and the detection And a control unit that controls the opening amount of the hopper by the shutter unit based on the output of the unit.

  According to the present invention, it is possible to stably charge the resin from the hopper without stagnation in the resin alignment portion of the resin supply unit.

The schematic diagram showing the resin supply unit of the resin sealing apparatus which concerns on 1st Embodiment of this invention. Schematic diagram showing mold of resin sealing device Schematic diagram showing the vicinity of the hopper of the resin supply unit The schematic diagram showing the hopper vicinity of the resin supply unit of the resin sealing apparatus which concerns on 2nd Embodiment of this invention.

  Hereinafter, an example of the first embodiment of the present invention will be described with reference to FIGS.

  Initially, the structure of the resin sealing apparatus 100 which concerns on this embodiment is demonstrated. In addition, the board | substrate in the following shows what mounted electronic components, such as a PCB board | substrate and a lead frame, as an example. Resin 104 indicates a tablet-shaped sealing material. The angle of repose α of the resin 104 refers to the angle of the slope of the deposit that maintains stability without spontaneously collapsing the deposit of the resin 104 that is formed when many resins 104 are stacked. Note that the angle of repose α here allows a slight error range in accordance with the actual situation of the tablet-shaped resin 104.

  The resin sealing device 100 is a transfer type resin sealing device, and includes a mold 110 (FIG. 2) and a resin supply unit 120 (FIG. 1) for supplying the resin 104 to the mold 110.

  As shown in FIG. 2, the mold 110 includes a lower mold 112 and an upper mold (not shown). The upper mold 112 and the lower mold 112 can be brought into contact with and separated from each other by a press mechanism (not shown). The lower mold 112 is provided with a plurality of pots 112B into which the resin 104 is charged, and plungers that are slidable up and down (arranged inside the pot 112B in FIG. 2) by fitting into the pots 112B. ing. The lower mold 112 is provided with a lower cavity 112A adjacent to the pot 112B. On the other hand, the upper die is a state in which a not-shown cull portion corresponding to the position of the pot 112B of the lower die 112 and a resin passage from the cull portion to the lower cavity 112A are in contact with the lower die 112. A runner and a gate (not shown). Further, an upper cavity (not shown) corresponding to the position of the lower cavity 112A is provided at the end of the gate (the resin inflow destination). That is, in a state where the substrate is clamped by the upper mold and the lower mold 112, the upper cavity and the lower cavity 112A constitute a cavity, and the substrate disposed in the cavity is sealed with resin. The mold 110 is heated to a predetermined temperature.

  When performing resin sealing with the mold 110, first, the substrate is placed at the position of the lower cavity 112A by a substrate loader (not shown). Further, a resin loader (not shown) disposes the resin 104 in each of the plurality of pots 112B (the resin loader holds the resin 104 corresponding to the interval between the plurality of pots 112B). Then, the substrate is clamped by the upper die 112 and the lower die 112, and the resin melted in the pot 112B is filled into the cavity through the runner and the gate, and the substrate is sealed with resin. The resin-sealed substrate (molded product) is unloaded from the mold 110 by an unloader (not shown).

  As shown in FIG. 1, the resin supply unit 120 includes a hopper 122, a shutter portion 126, a resin conveyance path 130, a ball feeder (resin alignment portion) 132, and a control portion 136.

  The hopper 122 has a cylindrical shape that maintains a substantially identical outer shape in the depth direction D thereof. The hopper 122 has a quadrangular cross section perpendicular to the depth direction D (may be a circle or another polygon). The hopper 122 stores a tablet-shaped resin 104. The hopper 122 is detachably supported and fixed to the support member 124 (not necessarily removable). Here, the support member 124 is inclined at an angle θ1 with respect to the horizontal direction (X direction). The angle θ1 is the same as the angle of repose α of the resin 104. For this reason, the hopper 122 is also inclined at the angle of repose α. In this embodiment, the hopper 122 has a cylindrical shape, but the hopper may have a funnel shape with a narrow bottom. The bottom surface 122A of the hopper 122 is opened, and the shutter portion 126 is detachably connected thereto. However, the shutter part may be integrated with the hopper.

  The shutter part 126 is movable along the bottom surface 122 </ b> A of the hopper 122. That is, the shutter part 126 constitutes an opening part of the hopper 122. The shutter unit 126 can limit the amount of the resin 104 charged into the ball feeder 132. Since the hopper 122 is inclined at an angle θ1 (= rest angle α), the shutter portion 126 is also inclined at the repose angle α together with the hopper 122. A motor (drive source) 128 is connected to one end of the shutter portion 126, and the amount of movement of the shutter portion 126 is determined according to the amount of rotation of the motor 128, and the opening amount of the hopper 122 is determined. A resin conveyance path 130 is disposed between the shutter unit 126 and the ball feeder 132.

  The resin conveyance path 130 is composed of an inclined member that is inclined at an angle θ2. Therefore, the resin 104 moving (falling) from the opening of the hopper 122 collides with the resin conveyance path 130. The resin conveyance path 130 is configured to change the moving speed and direction of the resin 104 according to the angle θ <b> 2 and guide the resin 104 to the ball feeder 132. That is, the resin conveyance path 130 can change the state of the resin 104 introduced from the opening at the front stage of the ball feeder 132. The angle θ2 is the repose angle α, but may be another angle between 0 ° and 90 °. Naturally, the resin conveyance path may be provided with a vibration generator such as a knocker or an ultrasonic vibrator in accordance with the angle θ2 in order to prevent positive resin stagnation and adjust the charging speed. Note that there may be no resin transport path, and the resin may be poured directly into the ball feeder from the hopper.

  The ball feeder 132 has a configuration for aligning the resin 104 introduced from the hopper 122. The ball feeder 132 is provided with a sensor (detection unit) 134 that detects the amount of resin 104 (resin amount) present in the ball feeder 132. As the sensor 134, a load sensor capable of detecting the weight of the resin 104 can be used. The detection result of the sensor 134 is output to the control unit 136. The resin 104 aligned by the ball feeder 132 is held by the above-described resin loader corresponding to the interval between the pots 112B.

  The control unit 136 is connected to the sensor 134 and the motor 128. That is, the control unit 136 can control the rotation amount of the motor 128, that is, the opening amount of the hopper 122 by the shutter unit 126 based on the output of the sensor 134. For example, when the output of the sensor 134 indicates that the amount of resin is equal to or less than a predetermined amount of resin, the control unit 136 performs control such that the motor 128 is rotated by a predetermined amount of rotation and stopped. Note that the rotation speed of the motor 128 may be constant or may be controllable. Here, for example, the predetermined resin amount may be a resin amount in a state where the resin 104 does not exist in the ball feeder 132 unless the control unit 136 immediately performs the charging process of the resin 104. Here, the output of the sensor 134 is binarized (the ON state is a state of a predetermined resin amount or less, the other is set to the OFF state, and the output indicating the ON state is also referred to as a request signal). Control can be performed easily and at high speed. However, the output of the sensor 134 may be processed in an analog manner (continuously), and the rotation amount of the motor 128 may be changed in accordance with the output of the sensor 134. Note that when a predetermined amount of rotation is instructed to the motor 128, a control unit for the output of the sensor 134 so that the control unit 136 can determine the amount of resin charged into the ball feeder 132 as a result. The processing interval 136 is determined. Of course, the control unit 136 may control the shutter unit 126 to move slowly and increase the opening amount until the sensor 134 confirms that the amount of resin present in the ball feeder 132 increases.

  The control of the opening amount of the hopper 122 is that when the shutter portion 126 is moved (for example, in the direction of the white arrow) and an opening is formed on the bottom surface 122A of the hopper 122, the opening amount (opening amount) is increased. This means that the shutter 126 is further moved in the direction to be moved (in the direction of the white arrow as it is). And the control part 136 is controlled so that opening amount may be expanded so that the fixed injection amount of the resin 104 to the ball feeder 132 can be ensured. Specifically, when the above-described predetermined amount of resin 104 no longer exists in the ball feeder 132, the sensor 134 detects and outputs it. For each output (request signal), the control unit 136 has a resin amount that allows the ball feeder 132 to function optimally (an appropriate amount of resin for efficiently aligning the resin 104, simply referred to as an appropriate amount of resin). Control to drop (move) from the opening. That is, as shown in FIG. 3, the control unit 136 determines a predetermined rotation amount of the motor 128 so that the shutter unit 126 is equally moved by a distance ΔL at which an appropriate amount of resin can be moved. (The broken line in FIG. 3 indicates an inclined surface by the resin 104). Here, the hopper 122 has a slender shape, and the inclination angle θ1 of the hopper 122 is the repose angle α. For this reason, it is possible to move (drop) the same amount of resin for each movement distance ΔL from the beginning until the hopper 122 becomes empty. That is, it is possible to constantly ensure a constant amount of resin 104 until the hopper 122 is empty. When the hopper is circular or polygonal in a cross section perpendicular to the depth direction D, the control unit may perform control to change the moving distance of the shutter unit so as to ensure a constant input amount. . The control unit 136 may be a part of the control unit of the resin sealing device 100.

  Next, the operation of the resin supply unit 120 will be described with reference to FIG.

  When the resin 104 is not present in the ball feeder 132, the control unit 136 receives an output (request signal) indicating the state (ON state) from the sensor 134. Then, the control unit 136 determines a predetermined amount of rotation of the motor 128 from a predetermined amount of movement of the shutter unit 126 such that the ball feeder 132 moves (drops) an appropriate amount of resin from the opening of the hopper 122. A predetermined amount of rotation is instructed to the motor 128.

  Then, according to the instruction, the motor 128 moves the shutter part 126 in the direction of the white arrow by the predetermined movement amount, and the motor 128 stops. That is, an opening having a size corresponding to a predetermined amount of rotation of the motor 128 is formed at the left end portion of the bottom surface 122A of the hopper 122, and the resin 104 moves (drops) from the opening (opening portion of the hopper 122).

  The moved (dropped) resin 104 collides with the resin conveyance path 130, the moving speed from the hopper 122 is reduced, and the moving direction (Z direction) from the hopper 122 is changed. Then, the resin 104 moves along the resin conveyance path 130 and is charged (moved) into the ball feeder 132.

  The ball feeder 132 detects the resin amount of the resin 104 into which the sensor 134 is charged. Here, since the sensor 134 detects that an appropriate amount of resin is present in the ball feeder 132, the control unit 136 does not instruct the motor 128 to rotate.

  As the alignment of the resin 104 proceeds with the ball feeder 132, the resin 104 present in the ball feeder 132 becomes less than a predetermined resin amount. Then, the control unit 136 receives an output (request signal) indicating the state (ON state) from the sensor 134 again, and an appropriate amount of resin is put into the ball feeder 132 from the hopper 122.

  In addition, when the movement of the shutter part 126 is repeated in one direction, the opening amount of the opening part increases, and when the shutter part 126 completely moves in the direction of the white arrow, the hopper 122 is empty. Become. Therefore, the empty hopper 122 is removed from the support member 124 and the shutter portion 126, and the hopper 122 in which the resin 104 is sufficiently stored is newly fixed to the support member 124 and the shutter portion 126. Then, by opening the bottom surface 122A of the hopper 122 with the shutter part 126 closed, the operation of the resin supply unit 120 becomes possible again.

  According to the prior art, it can be assumed that the resin supply unit includes a resin conveyance path provided with a vibrator without providing the shutter portion in the hopper. However, in such a resin supply unit, when a large amount of resin is stored in the hopper, as much resin as possible moves from the opening of the hopper to the vibration feeder, and the resin remaining on the hopper continues to the large number of resins. Therefore, it is conceivable that the weight (resin clogged state) of the large number of resins is directly pressed against the vibration feeder. In that case, even if the vibration feeder is vibrated vigorously, it is extremely difficult to eliminate the resin clogged state, and it is considered that the resin cannot be stably fed into the ball feeder. In order to avoid such a resin clogged state, it is sufficient to store a small amount of resin in the hopper. In that case, the hopper is frequently accessed to supply the resin to the hopper, or the hopper itself is removed. It becomes necessary to change frequently, and workability | operativity worsens.

  On the other hand, in the present embodiment, the amount of resin present in the ball feeder 132 is detected, and the amount of resin 104 charged into the ball feeder 132 from the hopper 122, which is the first storage location of the resin 104, is determined in the hopper 122. It can be adjusted to an appropriate amount by controlling the opening amount. For this reason, even if a large amount of resin 104 is stored in the hopper 122, a state of resin clogging that may occur in the prior art is not generated. In other words, the resin 104 can be stably fed into the ball feeder 132 of the resin supply unit 120 from the hopper 122 without stagnation. That is, workability can be improved as compared with the conventional case.

  In the present embodiment, control is performed so that the opening amount of the hopper 122 is increased so that the control unit 136 can secure a constant amount of the resin 104 to the ball feeder 132. That is, since the moving direction of the shutter portion 126 is one direction, the opening amount of the opening portion can be accurately adjusted without the influence of the backlash of the shutter portion 126. At the same time, the movement of the shutter portion 126 can be easily realized even in a state where a large amount of the resin 104 is stored in the hopper 122. Furthermore, by using the angle of repose α of the resin 104, it is easy to make the resin 104 introduced from the hopper 122 into a certain amount.

  Further, in the present embodiment, the resin supply unit 120 has the resin conveyance path 130 that changes the charging state of the resin 104 from the shutter unit 126 at the front stage of the ball feeder 132. Therefore, the charging speed of the resin 104 to the ball feeder 132 (collision speed with the ball feeder 132) can be reduced as compared with the case where the resin 104 is directly charged into the ball feeder 132 from the hopper 122, and the resin 104 is damaged. And the occurrence of scattering of the resin 104 can be reduced. At the same time, by using the resin conveyance path 130, the arrangement relationship between the hopper 122 and the ball feeder 132 can be optimized according to the convenience of the resin sealing device 100. Further, it is possible to realize the smoothing of the amount of resin 104 supplied from the hopper 122 over time and the addition to the ball feeder 132 accordingly. In addition, when a vibration generator such as a knocker or an ultrasonic vibrator is provided in the resin conveyance path, it is possible to change the power supplied to them according to the state of the resin on the resin conveyance path. It is possible to further promote optimization of the arrangement relationship and temporal smoothing of the amount of resin input.

  Further, in the present embodiment, the hopper 122 has a small cylinder shape that maintains substantially the same outer shape in the depth direction D, and is inclined to the repose angle α of the resin 104 together with the shutter portion 126. That is, since the hopper 122 has a cylindrical shape, the moving distance of the shutter portion 126 can be increased. For this reason, a small amount of resin 104 can be accurately put into the ball feeder 132 from the hopper 122. Since the hopper 122 is tilted together with the shutter portion 126 at the angle of repose α, by moving the shutter portion 126 equally from the state where the resin 104 is full to the hopper 122, a certain amount of resin 104 is transferred to the hopper 122. It can be thrown in until it becomes empty. That is, while the control by the control unit 136 is simple, a certain amount of the resin 104 can be charged, and the replacement cycle of the hopper 122 can be extended to the maximum.

  Although the present invention has been described with reference to the first embodiment, the present invention is not limited to the first embodiment. That is, it goes without saying that improvements and design changes can be made without departing from the scope of the present invention.

  For example, in the first embodiment, the hopper 122 is inclined at the angle θ1, but the present invention is not limited to this. For example, it may be as in the second embodiment shown in FIG. In the second embodiment, since the inclination angle of the hopper 222 is different from that in the first embodiment, only the different portions will be described, and the description in the first embodiment will be used for the other components.

  In the second embodiment, the support member 224 is not inclined, and the hopper 222 and the shutter portion 226 are not inclined. That is, the depth direction D of the hopper 222 coincides with the Z direction. For this reason, in the second embodiment, the arrangement and replacement of the hopper 222 can be realized relatively easily.

  In the second embodiment, the opening amount is increased so that the control unit can ensure a constant amount of resin to be fed into the ball feeder from the size of the predetermined opening after the opening is formed. Can be controlled. As shown in FIG. 4, when the inclined surface by the resin is stabilized at the angle of repose α with the opening formed, the distance V2 of the resin surrounded by the broken line becomes equal to the volume V1. This can be realized by obtaining the moving distance of the shutter portion 226 of ΔL2 (> ΔL1).

  Of course, it is not necessary to control the opening amount to be increased so that the control unit can ensure a certain amount of resin to be fed into the ball feeder.

  The resin sealing device of the present invention is suitable for a transfer type resin sealing device using a tablet-shaped resin.

DESCRIPTION OF SYMBOLS 100 ... Resin sealing apparatus 104 ... Resin 110 ... Mold 112 ... Lower mold 120 ... Resin supply unit 122, 222 ... Hopper 124, 224 ... Support member 126, 226 ... Shutter part 128 ... Motor 130 ... Resin conveyance path 132 ... Ball Feeder 134 ... Sensor 136 ... Control unit

Claims (4)

A resin sealing device comprising a resin supply unit having a hopper in which tablet-shaped resin is stored, and a resin alignment unit that aligns the resin charged from the hopper,
The resin supply unit is
A detection unit for detecting the amount of the resin present in the resin alignment unit;
A shutter part that constitutes an opening part of the hopper, and that can limit an amount of the resin charged into the resin alignment part;
A control unit that controls an opening amount of the hopper by the shutter unit based on an output of the detection unit. In claim 1,
The said control part is controlled so that the said opening amount may be expanded so that the fixed injection amount of the said resin to the said resin alignment part can be ensured. The resin sealing apparatus characterized by the above-mentioned. In claim 1 or 2,
The resin supply unit, wherein the resin supply unit includes a resin conveyance path that changes a state of charging the resin from the opening portion before the resin alignment portion. In any one of Claims 1 thru | or 3,
The said hopper is made into the size cylinder shape which maintains the substantially same external shape in the depth direction, and is inclined with the angle of repose of the said resin with the said shutter part. The resin sealing apparatus characterized by the above-mentioned.

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