JP2694509B2 - Resin sealing molding method for electronic parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a resin encapsulation molding method for encapsulating electronic parts such as ICs, LSIs, diodes and capacitors mounted on a lead frame with a resin material.

[0002]

2. Description of the Related Art Conventionally, electronic parts have been resin-molded by transfer molding.
The resin encapsulation molding apparatus used in this method includes, for example, a pair of molds in which a fixed mold and a movable mold are arranged so as to face each other,
A pot for supplying a resin material arranged in the mold, a plunger for pressurizing the resin fitted in the pot, a cavity opposed to the mold surfaces of the fixed and movable dies, and the pot and the cavity. A resin passage or the like arranged between them is provided. Then, while supplying the resin tablet in the pot, the electronic parts mounted on the lead frame are supplied and set at a predetermined position of the cavity portion to clamp both molds, and further, the resin tablet in the pot is heated. Further, by pressurizing and injecting the molten resin material in the pot through the resin passage into the required number of cavities arranged at the lateral positions of the pot, the electronic parts fitted in the respective cavities. Are molded with resin.

By the way, both the fixed and movable molds are heated to the resin molding temperature (for example, 170 to 190 ° C.), but the lead frame supplied to the cavity of both molds is at room temperature (or room temperature). Therefore, it is necessary to preheat the lead frame to reduce the temperature difference between the two, or to eliminate this temperature difference and perform the die setting of the lead frame satisfactorily and reliably.

The following are known as preheating of the lead frame for such a purpose. For example, a so-called metal, in which a lead frame at room temperature is supplied to the cavity parts of both molds and the lead frame is heated to a predetermined temperature after a certain period of time (for example, 5 to 10 seconds) is passed in that state An in-mold preheating method is known. This method has an advantage in that it does not require a dedicated preheating device because the mold itself is used for preheating the lead frame, but on the other hand, the above-mentioned preheating of the lead frame is not performed during the molding time. Since it is necessary to incorporate the time required for heating, there is a problem that the overall molding time becomes long.

Further, for example, an exclusive preheating mechanism is provided in an alignment portion for aligning the leadframes in a predetermined direction, and the preheating mechanism preheats the leadframe to a predetermined temperature and preheats the preheating. There is known a so-called pre-mold outside heating method in which the lead frame is conveyed and supplied to the cavity portions of both molds via the conveying mechanism. In this method, since the lead frame alignment work in the aligning section or the waiting time before the lead frame is conveyed can be effectively used as the preheating time, the former molding time becomes long. There is an advantage that the problem can be solved. However, the preheating mechanism section and the cavity sections of both molds have the same structure and structure as the resin encapsulation molding apparatus for electronic parts.
In terms of configuration, or considering the supply and transport functions of members,
Usually, they are arranged at distant positions. In addition to these structural factors, the lead frame conveyed and supplied to the cavity through the above-mentioned conveying mechanism is subjected to the air cooling action during the conveyance, so that the lead frame is eventually There is a problem that the preheating must be performed again in the mold in accordance with the above-mentioned method of preheating in the mold. Further, in a resin sealing molding apparatus for electronic parts configured by disposing two or more molding units equipped with a resin sealing molding die, the distance between the preheating mechanism section and both mold cavity sections described above. In addition to the problem that the lead frames are separated from each other, there is a difference in the temperature of the lead frame conveyed and supplied to each mold, so it is necessary to provide a difference in the re-preheating time in the mold described above. There is a problem that the encapsulation molding process becomes unnecessarily troublesome. In addition, since the preheated lead frame is air-cooled during transportation and is difficult to be separated from the transportation means, there is a problem that a defective setting in the mold is likely to occur.

[0006]

Therefore, in the present invention, it is not necessary to set the entire molding time to be long, and moreover, the lead frame which is preheated efficiently and surely to a predetermined temperature is resin-molded. An object of the present invention is to provide a resin encapsulation molding method for an electronic component, which can be quickly supplied to a predetermined position of a mold cavity portion in an apparatus.

[0007]

In order to solve the above technical problems, a method of resin-molding an electronic component according to the present invention is an electronic device mounted on a lead frame at a predetermined position of a mold cavity of a molding unit. The electronic tablet fitted in the mold cavity is resin-sealed by heating and melting the resin tablet supplied in the mold pot while supplying the parts and injecting and filling the molten resin material into the mold cavity. A method of resin-sealing an electronic component to be statically molded, comprising the step of disposing two or more sets of molding units equipped with preheating means for the lead frame before resin sealing in the vicinity of the mold cavity portion,
A step of disposing a set of loader units that simultaneously conveys a required number of resin tablets and preheated pre-resin-sealed lead frames to a predetermined position of the mold cavity, and And a step of transporting and supplying a required number of pre-encapsulated lead frames to the position of the preheating means in each of the molding units, and a step of transporting and supplying to the position of the preheating means in each of the molding units. Preheating the pre-resin-sealed lead frame to a required temperature, and preheating each molding unit to a predetermined position of the mold cavity of each molding unit via the set of loader units. Lead frame before resin encapsulation and required number after the above preheating process by means It is characterized in that performing the simultaneous conveyance supplying step, respectively of the resin tablet.

[0008]

According to the present invention, the required number of pre-resin-sealed lead frames are placed at the position of the preheating means provided in the vicinity of the mold cavity portion in each molding unit through the above-mentioned set of loader units. The lead frames before resin encapsulation can be preliminarily heated to a required temperature while being fed and supplied, respectively, during a waiting time for feeding to the mold cavity portion. Further, the lead frame before resin encapsulation, which has undergone the preheating process, can be quickly conveyed and supplied to a predetermined position of the mold cavity through the set of loader units. That is, since the preheating means and the mold cavity portion are arranged in the vicinity of each other, the lead frame before resin encapsulation that has undergone the preheating step is conveyed and supplied to the mold cavity portion by a set of loader units. In (1), it is hardly air-cooled, or even if it receives an air-cooling action, it has almost no effect, and this can be substantially ignored. Therefore, the preheating temperature of the lead frame before resin encapsulation and the resin molding temperature in the mold cavity are approximately the same temperature, or the preheating temperature is slightly higher than the resin molding temperature. By setting in advance, it is possible to omit the above-mentioned preliminary in-mold preheating step.

[0009]

Next, the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows the configuration of a resin encapsulation molding apparatus for electronic parts for using the present invention. 2 is an enlarged schematic plan view showing an essential part of the apparatus, FIG. 3 is a schematic side view of the apparatus corresponding to FIG. 2, FIG. 4 is a schematic front view of the apparatus corresponding to FIG. 2, and FIG. FIG. 3 is a schematic plan view of the device corresponding to FIG. 2.

The resin encapsulation molding apparatus includes a lead frame supply unit 1 on which electronic components are mounted and which is not resin-encapsulated.
A lead frame aligning unit 2 for aligning the pre-resin-sealed lead frame in a predetermined direction, a resin tablet supply unit 3, a resin tablet unloading unit 4 for aligning and unloading the resin tablet, and resin sealing and molding the electronic components. The molding unit 5 and the aligned lead frame and resin tablet are combined with the molding unit 5.
A loader unit 6 for transporting to, an unloader unit 7 for taking out the resin-sealed lead frame after molding, a mold cleaner unit 8, and a degate unit 9 for removing the gate in the resin-sealed lead frame. A pickup unit 10 for individually attaching the resin-sealed lead frames from which the gate has been removed, a lead frame housing unit 11 for housing the resin-sealed lead frames in each magazine, and the above-mentioned units. A controller unit 12 for continuously and automatically controlling each operation is provided.

In addition, the lead frame supply unit 1 described above includes a set portion 15 of an in-magazine 14 which accommodates a large number of lead frames 13 before resin sealing in which electronic components are mounted.
And the lead frame 13 before resin sealing in the in-magazine 14
An appropriate pusher mechanism 16 and an appropriate transfer mechanism 17 for individually transferring the respective components to the lead frame alignment unit 2 side are provided.

The lead frame aligning unit 2 is provided with an appropriate aligning mechanism 18 for aligning the lead frames 13 before resin encapsulation conveyed from the lead frame supplying unit 1 in a predetermined direction. There is. In the illustrated example, two lead frames 13 before resin encapsulation are aligned in parallel and one of the lead frames 13 before resin encapsulation is arranged in parallel in correspondence with the die layout of the molding unit 5 described above. Although the case where an inversion alignment mechanism for mounting in the opposite direction is provided is shown, for example, in the case of a die layout of a type that supplies one lead frame before resin encapsulation, the lead before resin encapsulation is used. It is not necessary to perform the above inversion action to align the frames in the opposite direction.

The resin tablet supply unit 3 is also provided.
A plurality of supply members (not shown) for the resin tablets 19 corresponding to the number of pots of the molding unit 5 are arranged in the container (see FIG. 3).

In addition, a suitable pusher mechanism (not shown) for carrying out the resin tablet 19 stored in the resin tablet supply member of the resin tablet supply unit 3 in an aligned state is carried out to the resin tablet carry-out unit 4 described above. ) Is provided.

The molding unit 5 described above
Includes a fixed plate (not shown) fixed to the upper part of the apparatus main body 20 through a tie bar 21, a fixed upper die (not shown) mounted on the fixed plate, and a lower part of the fixed upper die which is disposed so as to face each other. Further, a movable lower mold 22 that is vertically driven by a required mold opening / closing mechanism (not shown) and a plurality of (five in the illustrated example) pots 23 arranged on the movable lower mold side are provided. Further, a plunger for pressurizing a resin tablet is fitted in each pot 23, and a mold heating means such as a heater is provided in both upper and lower molds, and the mold surfaces of the upper and lower molds are mounted. A required number of resin molding cavities are provided opposite to each other, and a resin passage is provided between each pot 23 and each cavity (not shown). Therefore, with both upper and lower molds clamped,
The resin tablet 19 in each pot 23 is heated and melted by the heating means and pressed by the plunger, so that the molten resin material can be injected and filled into each cavity through the resin passage. Has been done.

Further, the loader unit 6 described above includes
Two pre-resin-sealed lead frames 13 aligned by the lead frame alignment unit 2 and a plurality of aligned lead-outs by the resin tablet supply unit 3 and resin tablet unloading unit 4 (five in the illustrated example) A loader 24 that simultaneously conveys the resin tablet 19 of FIG. Also, the loader 24
Are provided so as to reciprocate between the position of the lead frame alignment unit 2 and the position of the molding unit 5. Further, at the position of the lead frame alignment unit 2, the two lead frames 13 before resin encapsulation can be attached via an appropriate lead frame engaging / disengaging mechanism 25. At the position of the resin tablet unloading unit 4, each resin tablet 19 that has been unloaded.
Can be attached via an appropriate resin tablet engagement / disengagement mechanism 26, and via an appropriate lead frame engagement / disengagement mechanism 125 provided on the side of the resin tablet engagement / disengagement mechanism 26.
The lead frame before resin encapsulation, which has undergone a pre-heating step described later, is provided so that it can be attached at the same time.

Between the lead frame alignment unit 2 and the resin tablet unloading unit 4 described above, the engagement / disengagement mechanism 25 of the lead frame 13 before resin encapsulation in the loader unit 6, the engagement / disengagement mechanism 26 of the resin tablet 19, and preheating. The lead frame (113) and the engagement / disengagement mechanism 125, and the mold of the molding unit 5 and the pre-heating means (33) described later are provided so that their intervals are substantially equal to each other.

In the unloader unit 7, the resin-sealed lead frame 213 molded by the molding unit 5 is taken out of the upper and lower molds, and the resin-sealed lead frame 213 is taken out. An unloader 27 for carrying to the position of the degate unit 9 is provided. In addition, this unloader
In order to take out the resin-sealed lead frame with 27, at the position of the molding unit 5, two resin-sealed lead frames and the gate portion 28 integrated between the resin-sealed lead frames are taken out. Appropriate engagement / disengagement mechanism
It is carried out with 29 locked together at the same time.

The cleaner unit 8 is provided with an air blow mechanism for blowing air onto the mold surfaces of the upper and lower molds of the molding unit 5 to cool the resin burrs adhering to the mold surfaces to facilitate separation. A vacuum mechanism or the like for suctioning and removing resin burrs, dust, and the like separated from the mold surface is provided (not shown). Further, since the cleaner unit 8 is fixed to the unloader 27 of the unloader unit 7, the cleaner unit 8 simultaneously reciprocates with respect to the position of the molding unit 5 as the unloader unit 7 reciprocates. It is provided to move. The cleaner unit 8 operates, for example, when the unloader unit 7 engages with the resin-sealed lead frame 213 and retracts to the outside, and removes dust on the mold surface by both air blow and vacuum. It is provided so as to be peeled off and sucked and accommodated in an appropriate dust collecting portion. Accordingly, this makes it possible to easily and efficiently perform mold surface cleaning before the next resin molding. The air blow mechanism may be provided as needed. That is, as described above, the air blow action of the mold surface by the air blow mechanism is provided together to enhance the function of forcibly sucking and removing the resin burr and dust on the mold surface by the vacuum mechanism. The necessity of, the degree of strength of the air blow action, etc. may be appropriately selected according to the mode of resin molding. In addition, according to the above-described fastening and unifying structure of the unloader unit 7 and the cleaner unit 8, the overall structure of the apparatus can be simplified, and the overall molding time can be shortened. However, there is no problem in adopting a configuration in which both of them are separately configured and individually operated. Further, the cleaner unit 8 may be provided with, for example, a brush member for forcibly peeling off resin burrs adhering to the mold surface and a vibrating mechanism thereof.

The degate unit 9 is provided with a gate break mechanism 30 for removing the gate portion 28 of the resin-sealed lead frame 213 carried by the unloader 27 of the unloader unit. Has been. The gate breaking mechanism 30 attaches two resin-sealed lead frames 213, which are connected and integrated via the gate portion 28, through an appropriate engaging / disengaging mechanism (not shown), and In this state, the gate portion 28 between the two lead frames is pressed so that it can be cut and removed.

Further, the pickup unit 10 is provided with an engagement / disengagement mechanism 31 for individually attaching the resin-sealed lead frames 213 cut and separated in the digating unit 9.

Further, the lead frame accommodating unit 11 described above is capable of accommodating the resin-sealed lead frames 213, which are separately engaged through the engaging / disengaging mechanism 31 of the pickup unit 10, respectively. Are arranged.

In addition, the controller unit 12 described above
Is for continuously and automatically controlling each operation of each unit.

Further, the molding unit 5 described above
In the vicinity of the mold cavity part in, the lead frame 13 before resin encapsulation is heated to a required temperature, for example, the resin molding temperature in the mold cavity part or a temperature slightly higher than the resin molding temperature. Appropriate preheating means 33 for preheating is provided.

The above is an example of the constitution comprising the combination of the minimum constitutional units required for the apparatus for resin-molding electronic parts (see FIG. 1).
However, the method of the present invention can be suitably carried out by an apparatus in which the following configuration is added to the above configuration.

That is, this structure is the same as the molding unit 5 for the resin encapsulation molding apparatus composed of a combination of the above-mentioned minimum structural units, as shown by a chain line in FIG. 1 or 5. Another required number of molding units 5 having functions are added and combined. Therefore, in this case, two or more sets of molding units 5 provided with the preheating means 33 of the lead frame before resin sealing are arranged in the vicinity of the mold cavity portion. Further, even when two or more sets of molding units 5 are provided in this way, the loader unit can also be the one described above, and therefore one set of loader units 6 may be provided.
Further, in this case, most of the respective constituent members in the resin encapsulation molding apparatus for electronic parts, which is composed of the combination of the minimum constituent units shown in FIG. 1, can also be used.

Each step of the method of the present invention will be described below. Before starting the resin molding process or after finishing all the previous steps, the resin-sealed lead frame 213 is taken out of the upper and lower molds via the unloader unit 7. It is assumed that this is conveyed to the position of the degutting unit 9, and the upper surface of the preheating means 33 in each of the molding units 5 is provided with 2 in preparation for the next resin molding step in the molding unit 5. It is assumed that the lead frames 13 before resin encapsulation are respectively placed and a required preheating step is performed.

In the above-mentioned state, the two pre-resin-sealed lead frames 13 housed in the in-magazine 14 of the lead frame supply unit 1 are transferred to the lead frame alignment unit 2 side via the pusher mechanism 16. While being separately conveyed, the lead frame 13 before resin sealing is aligned in a predetermined direction by the alignment mechanism 18 of the lead frame alignment unit 2. In addition, following the above-mentioned steps of carrying and aligning the two lead frames 13 before resin sealing, or
In parallel with these steps, the five resin tablets 19 are aligned and carried out by the resin tablet supply unit 3 and the resin tablet carry-out unit 4.

Next, as shown by a chain line in FIG. 5, the loader 24 in the loader unit 6 is moved to a position above the lead frame alignment unit 2 and the resin tablet supply unit 3, and at the same time, two engagements in the loader 24 are performed. The two resin-unsealed lead frames 13 in the lead frame alignment unit 2 and the five resin tablets 19 in the resin tablet supply unit 3 are attached to each other via the removing mechanisms 25 and 26, respectively.

Next, as shown by the solid line in FIG. 5, the loader 24 is moved to a position above the preheating means 33, and the loader 24 is moved to the mold cavity portion side of the molding unit 5. To move. next,
Lead frame before resin encapsulation after preheating placed on the preheating means 33 by the engagement / disengagement mechanism 125 of the loader 24.
Fasten 113. Next, the loader 24 is further moved to the mold cavity side, and the five resin tablets 19 engaged by the engagement / disengagement mechanism 26 and the two resin tablets engaged by the engagement / disengagement mechanism 125 after preheating are The lead frame 113 before resin sealing is conveyed to a predetermined position above the lower mold 22 in the molding unit 5. Next, by releasing the engagement state of the resin tablet 19 by the engagement / disengagement mechanism 26 of the loader 24 and the engagement state of the lead frame 113 before resin sealing after preheating by the engagement / disengagement mechanism 125, respectively, The resin tablets 19 are placed in the pots 23 of the lower mold 22, and the two pre-heated pre-resin-sealed lead frames 113 are placed at predetermined positions such as the fitting set portion provided on the lower mold 22, respectively. Supply. Therefore, at this time, the pre-resin-sealing lead frame 13 at room temperature (or a temperature not reaching the resin molding temperature) is preheated to a required temperature by the preheating means 33 arranged in the vicinity of the mold cavity. In addition, since the pre-heated lead frame 113 before resin encapsulation can be quickly conveyed and supplied to a predetermined position in the mold cavity, the temperature drop of the lead frame 113 before resin encapsulation after the pre-heating can be efficiently performed. Good and reliable prevention is possible. Further, since it is possible to substantially prevent a temperature decrease when the lead frame 113 before resin encapsulation after preheating is fed, it is not necessary to perform the re-preheating step in the mold as in the conventional case described above.

Next, the loader 24 is retracted from the position of the molding unit 5 and the engagement state by the engagement / disengagement mechanism 25 is released, and the preheating process attached to the engagement / disengagement mechanism 25 is not performed. Two lead frames 13 before resin sealing are placed on the upper surface of the preheating means 33. The two pre-resin-sealing lead frames 13 placed on the pre-heating means 33 are used in the next resin molding step, and the pre-resin-sealing lead frame 13 is the pre-heating means 33. The loading / unloading mechanism of the loader 24 after being placed on
It will be preheated to the required temperature during the waiting time before being locked by 125.

Therefore, the above-mentioned set of loader units 6
And the step of transporting and feeding the pre-resin-sealed lead frame 13 to the position of the preheating means 33 in each of the molding units 5 via
The step of preheating the pre-resin-encapsulated lead frame 13 conveyed and supplied to the position of the preheating means 33 through the preheating means 33 in each of the steps is constituted by a combination of the above-mentioned minimum constituent units. The same number of times as the total number of the molding units 5 of the resin encapsulation molding apparatus and the molding units 5 that are additionally combined with the resin encapsulation molding apparatus (two times in the case of FIG. In the case of 4) will be performed. Then, each molding unit 5 is connected through the set of loader units 6.
And a step of simultaneously carrying and feeding the pre-resin-sealed lead frame 113 and the resin tablet 19 which have been subjected to the pre-heating step by the pre-heating means 33 of each molding unit 5 to a predetermined position of the mold cavity portion in FIG. You can

Next, the upper and lower molds are clamped by the mold opening / closing mechanism, and the resin tablets 19 in each pot 23 are heated and pressed to be melted, and the molten resin material is passed through the resin passage into each cavity. Each electronic component is injected and filled, and the electronic components fitted in the respective cavities are resin-sealed and molded.

Next, as described above, the resin-molded resin-sealed lead frame 213 is taken out of the upper and lower molds of the molding unit 5 to the outside through the unloader 27 of the unloader unit 7, and the unloader 27 is used. When the loader 27 moves backward, the cleaner unit 8
The air blow mechanism and the vacuum mechanism in 2) perform the cleaning of the mold surfaces by peeling off and sucking the dust on the mold surfaces of the upper and lower molds while air blowing and vacuuming.

Next, the gate portion 28 of the resin-sealed lead frame 213 is cut and removed via the gate breaking mechanism 30 of the degate unit 9.
Next, the engagement / disengagement mechanism 31 in the pickup unit 10 described above.
Two resin-sealed lead frames separated via
The two resin-sealed lead frames 213 may be separately housed in the stock magazines 32 while the 213 are separately engaged and transported.

The loader unit 6 of the resin encapsulation molding apparatus described above is constructed by providing the loader 24 with two lead frame engaging / disengaging mechanisms 25 and 125 and horizontally disposing the engaging / disengaging mechanisms. However, instead of such a configuration of the loader unit, for example, as shown in FIGS. 6 to 10, two lead frame engaging / disengaging mechanisms 25 and 125 are vertically arranged in the loader 24. May also be configured
As shown in FIGS. 11 to 16, the loader 24 is provided with one lead frame engaging / disengaging mechanism 25, and the area of the preheating means 33 in the molding unit 5 is approximately doubled as compared with that of the above configuration example. It may be configured by enlarging.

6 to 10 show the loader 24 in which two engagement / disengagement mechanisms 25 and 125 are arranged vertically, and the basic configuration and operation in this case are the same as those of the above configuration example. Since it is substantially the same as the above, only the points different from those of the above configuration example will be described. This configuration example is different in that the engaging / disengaging mechanisms 25 and 125 of the loader 24 are arranged vertically, which improves the operability of the loader 24 and improves the overall resin sealing molding apparatus. This is advantageous in that the shape can be reduced. That is, in this case, as shown in FIGS. 6 to 7, the resin-sealed lead frame 13 aligned in the lead frame alignment unit 2 is engaged and conveyed and supplied by the upper engagement / disengagement mechanism portion 225. Is provided. Further, as shown in FIG. 10, mounting of the pre-resin-sealing lead frame 13 attached to the upper engaging / disengaging mechanism portion 225 on the preheating means 33 is also performed by the upper engaging / disengaging mechanism portion 225. It is provided in. In addition, the preheating means 33 described above
8 to 11 are used to attach the lead frame 113 before resin encapsulation, which has been subjected to the preheating process, mounted on the upper surface of the above, and to convey and supply the lead frame 113 before resin encapsulation to a predetermined position in the mold cavity portion. As shown in FIG. 9, the lower engaging / disengaging mechanism 325 is provided.

11 to 16, the loader 24 is provided with one lead frame engagement / disengagement mechanism 25, and the area of the preheating means 33 in the molding unit 5 is approximately doubled as compared with that of the above-mentioned configuration example. However, since the basic configuration and operation in this case are substantially the same as those of the above-described configuration example, only the points different from those of the configuration example will be described. In this configuration example, the loader 24 is provided with one lead frame engagement / disengagement mechanism 25, and preheating means 33 and 133 having an area about twice as large as that of the configuration example are arranged. Are different from each other, which is advantageous in that the operability of the loader 24 can be improved and the overall shape of the resin sealing molding device and the loader 24 can be downsized. That is, in this case, the one lead frame engaging / disengaging mechanism 25 is provided so that the resin-sealed lead frame 13 aligned in the lead frame alignment unit 2 can be attached and conveyed by one lead frame engaging / disengaging mechanism 25. As shown in FIG. 11, the lead frame 13 before resin sealing is attached by the engaging / disengaging mechanism 25, and then, as shown in FIG. 12, a resin tablet provided on the side of the engaging / disengaging mechanism 25. The resin tablet 19 is attached and detached by the engagement / disengagement mechanism 26. And
Next, as shown in FIG. 13, the lead frame 13 before resin encapsulation and the resin tablet 19 which are engaged with each other via the loader 24.
Is transferred to the position of the preheating means, and the engagement state of the lead frame 13 before resin sealing by the engagement / disengagement mechanism 25 is released to leave the lead frame 13 before resin sealing in the empty space in the preheating means. It is placed on the upper surface of the portion (preheating means 133 in the illustrated example). Next, as shown in FIG. 14, the pre-resin-sealing lead frame 113, which has completed the preheating process in the preheating means 33, is engaged by the engagement / disengagement mechanism 25 of the loader. Next, as shown in FIG. 15, the loader 24 is moved to the mold cavity side,
The five resin tablets 19 attached by the engaging / disengaging mechanism 26 and the pre-heated resin-sealed lead frame 113 engaged by the engaging / disengaging mechanism 25 are conveyed to a predetermined position above the lower mold 22. At the same time, the engagement state of the resin tablet 19 by the engagement / disengagement mechanism 26 and the engagement state of the lead frame 113 before resin sealing after preheating by the engagement / disengagement mechanism 25 are released, respectively. 16 is supplied to each predetermined position of
11, the loader 24 may be moved back to the position of the lead frame alignment unit 2 shown in FIG.

The present invention is not limited to the above-mentioned embodiments, and can be arbitrarily and appropriately modified and selected as needed within the scope of the gist of the present invention. Is.

For example, in addition to the configuration of the above embodiment, the lead frame carrying mechanism such as the loader unit 6 may be provided with an auxiliary preheating means (not shown). In this case, since the lead frame before resin encapsulation at room temperature is conveyed from the lead frame alignment unit 2 to the preheating means 33 and 133, the lead frame can be supplementarily preheated. There is an advantage that the original preheating time by 33/133 can be further shortened.

Further, the main preheating means 33 and 133 described above are used.
As the auxiliary preheating means, for example, an ordinary heater, a type of irradiating a halogen lamp, or the like suitable for this type of preheating means can be appropriately selected and used.

[0042]

According to the method of the present invention, the position of the preheating means in which a required number of pre-resin-sealed lead frames are provided in the vicinity of the mold cavity portion in each molding unit via a set of loader units Can be preliminarily heated to a required temperature during the waiting time for the lead frame to be sealed with the resin, and the lead frame before resin encapsulation can be further fed through the set of loader units. Thus, the lead frame before resin encapsulation that has undergone the preheating step can be quickly conveyed and supplied to a predetermined position of the mold cavity. For this reason, it is possible to substantially prevent the temperature of the lead frame before resin sealing after preheating from being lowered, and thus it is not necessary to perform the conventional preheating in the mold as described above. Therefore, according to the present invention, it is not necessary to set the overall molding time to be long, and moreover, the lead frame before resin encapsulation efficiently preheated to the required temperature can be used as the mold cavity portion of the resin encapsulation molding apparatus. Since it can be quickly supplied to a predetermined position, the above-mentioned conventional problems can be surely eliminated, so that a resin-sealed molded product of an electronic component having high quality and high reliability can be efficiently manufactured. It has an excellent practical effect that it can provide a resin encapsulation molding method for electronic parts that can be produced.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a resin encapsulation molding apparatus for electronic parts for using the present invention, showing a configuration in which two sets of molding units are arranged.

FIG. 2 is a partially cutaway schematic plan view showing an enlarged main part of the resin encapsulation molding apparatus corresponding to FIG.

3 is a partially cutaway schematic side view of the device corresponding to FIG.

FIG. 4 is a partially cutaway schematic front view of the device corresponding to FIG.

5 is a schematic plan view of an apparatus corresponding to FIG. 2, showing a configuration in which four sets of molding units are arranged.

FIG. 6 is a schematic side view of a resin encapsulation molding apparatus for another electronic component for using the present invention, in which a lead frame alignment unit, resin tablet supply / unload units, and a loader unit. Are shown respectively.

FIG. 7 is a schematic side view of an apparatus corresponding to FIG.

FIG. 8 is a schematic side view of the apparatus corresponding to FIG. 6, showing a molding unit, each part of the preheating means, and a loader unit.

FIG. 9 is a schematic side view of an apparatus corresponding to FIG.

10 is a schematic side view of an apparatus corresponding to FIG.

FIG. 11 is a schematic plan view of a resin encapsulation molding apparatus for another electronic component for using the present invention, in which a lead frame alignment unit, a resin tablet supply / delivery unit, a preheating unit, and a molding unit. Each of the parts and the loader unit are shown.

12 is a schematic plan view of an apparatus corresponding to FIG.

FIG. 13 is a schematic plan view of an apparatus corresponding to FIG.

FIG. 14 is a schematic plan view of an apparatus corresponding to FIG.

FIG. 15 is a schematic plan view of an apparatus corresponding to FIG.

16 is a schematic plan view of an apparatus corresponding to FIG.

[Explanation of symbols]

 1 ... Lead frame supply unit 2 ... Lead frame alignment unit 3 ... Resin tablet supply unit 4 ... Resin tablet unloading unit 5 ... Molding unit 6 ... Loader unit 7 ... Unloader unit 8 ... Cleaner unit 9 ... Deguting unit 10 ... Pickup Unit 11… Lead frame accommodating unit 12… Controller unit 13… Lead frame before resin sealing 113… Lead frame before resin sealing 213… Lead frame with resin sealing 14… In magazine 15… Set part 16… Pusher mechanism 17… Transfer Mechanism 18 ... Alignment mechanism 19 ... Resin tablet 20 ... Machine body 21 ... Tie bar 22 ... Lower mold 23 ... Pot 24 ... Loader 25 ... Engaging mechanism 125 ... Engaging mechanism 225 ... Upper engaging mechanism 325 ... Lower engaging mechanism 26… Engagement mechanism 27… Unloader 28… Gate part 29… Engagement Organization 30 ... gate breaking mechanism 31 ... detachment mechanism 32 ... Stock magazine 33 ... preliminary heating means 133 ... preliminary heating means

Claims (1)

(57) [Claims] 1. An electronic component mounted on a lead frame is supplied to a predetermined position of a mold cavity portion of a molding unit, and a resin tablet supplied into a mold pot is heated and melted, and the molten resin material is applied to the mold. A resin encapsulation molding method for an electronic component, which comprises resin-encapsulating the electronic component fitted in the mold cavity by injecting and filling the resin into a cavity, wherein a resin is provided at a position near the mold cavity portion. A step of disposing two or more sets of molding units equipped with preheating means for the pre-sealing lead frame, and a required number of resin tablets and preheated resin pre-sealing leads at predetermined positions in the mold cavity portion. The step of arranging a set of loader units that simultaneously conveys and supplies the frame, and A step of transporting and supplying a required number of pre-resin-sealed lead frames to the position of the preheating means in each of the molding units, and a step of transporting and supplying to the position of the preheating means through the preheating means in each of the molding units. And preheating the pre-resin-encapsulated lead frame to a required temperature, respectively, through the set of loader units, at a predetermined position of the mold cavity portion of each of the molding units, a spare of each of the molding units. A resin-encapsulated lead frame that has been subjected to the above-described preheating step by a heating means
A resin encapsulation molding method for an electronic component, which comprises performing a step of simultaneously carrying and supplying each of a required number of resin tablets.