JPH0761665B2 - Method of molding hollow package for element sealing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an element such as a silicon chip or a crystal oscillator, which is wired in a lead frame, made of resin or the like so that a space is formed around the element. The present invention relates to a method for molding a hollow element-sealing package for sealing.

[Prior Art] A method for molding a hollow package of this type will be described with reference to FIG.

FIG. 6 is a view showing a conventional hollow package, wherein reference numeral 1 is a container body, and 2 is a lid for closing the opening of the container body 1. The container body 1 is formed integrally with the lead frame 3, and at its opening, a stepped portion 1a is formed along the inner peripheral edge of which the lid 2 is fitted. Further, 4 is an element such as a silicon chip or a crystal oscillator sealed in a hollow package.

To mold this hollow package and seal the element 4,
First, the lead frame 3 is inserted into a first mold (not shown), and the container body 1 is molded integrally with the lead frame 3. At this time, the container body 1 is molded so that a space is created in a portion of the lead frame 3 where the element 4 is attached.

Further, the lid 2 is molded using a second mold (not shown).

Then, after the element 4 is adhered to the lead frame 3 and wiring is performed, the lid 2 is adhered to the opening of the container body 1. In this case, the lid body 2 is adhered to the stepped portion 1a of the container body 1 in a fitted state.

The above-mentioned conventional example is an example of molding using a thermosetting resin. When a thermoplastic resin is used, the container body 1 and the lid 2 are joined by welding such as ultrasonic welding.

[Problems to be Solved by the Invention] By the way, in the above method, the container body 1 is molded by the first mold, and the lid body 2 is molded by the second mold.
In order to join the lid 2 and the lid 2, it is necessary to bring the ones molded by the first mold and the second mold together to carry out adhesion or welding, which complicates the process, lacks mass productivity, and increases the cost. There was a problem of becoming. Therefore, it has been desired to develop a new technique for simplifying the process.

[Means for Solving Problems] The present invention has been made to solve the above problems, in which a lead frame is inserted into a first mold and an element of the lead frame is mounted. Forming a container body having a flat opening end face integrally with the lead frame so that a space is formed in the portion; wiring the element to the lead frame in the container body; And a second container body integrally having the element
After inserting the mold into the mold, closing the opening in a state where the end surface is exposed by a flat slide core having a heat generating portion at the tip and being slid along the opening end surface of the container body, A step of integrally molding a lid body for closing the opening portion of the container body by filling a molten resin in a cavity having an opening end surface and a slide core as a part of an inner wall, and the container body; While pulling out the slide core from between the lid and the lid, the heating portion provided at the tip of the slide core is caused to generate heat to melt the resin at the pull-out port of the slide core formed between the lid and the container main body, and the cavity. A part of the mold forming the mold is projected to the cavity side, and the melted part of the lid arranged in the extraction port is pressed against the end face of the opening of the container body and welded. .

[Operation] According to the present invention, in the step of molding the container body in the first mold, the container body having the flat opening end face into which the lead frame is inserted is integrally molded.
Then, in the next step, the element is wired to the lead frame in the container body.

Further, in the next step, the container main body integrally having the element and the lead frame as described above is inserted into the second mold. Then, the flat plate-shaped slide core is slid along the end face of the flat opening of the container body inserted in this way, so that the opening is closed with the end face exposed by the slide core.

In this state, a cavity having the exposed end face of the container body and the slide core in a part of the inner wall is formed in the second mold, and the cavity is filled with the molten resin. The lid body formed in the above and the container body are welded and integrally molded.

Then, when the slide core is pulled out, the heating element provided at the tip portion of the slide core is caused to generate heat, whereby the resin at the pull-out port of the slide core is melted. Furthermore, by pulling out a part of the mold and pressing the melted portion of the lid against the end face of the opening to weld it, the extraction port is crushed, and a space is provided around the element to seal the element. The hollow package will be molded.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. The same or similar elements as those in FIG. 6 are designated by the same reference numerals to simplify the description.

FIG. 1 is a view showing the container body 1 of the hollow package of this embodiment. In this figure, reference numeral 3 is a lead frame, which is formed into a set of three so that they can be continuously inserted into the mold, and is integrally formed with the feed member 3a.

To mold this container body 1 with a thermoplastic resin,
First, as shown in FIG. 2, the lead frame 3 is inserted into the first mold 5 to mold the container body 1.

The first mold 5 is formed as a split mold composed of an upper mold 6 and a lower mold 7, and the recess 6 a and the lower mold 7 formed in the upper mold 6.
The cavity 8 is formed between the convex portion 7a and the convex portion 7a. Also, on the parting surface 7b of the lower mold 7,
A groove 7c for mounting the inserted lead frame 3 is formed. Further, 6b is a gate.

The lead frame 3 inserted in this first mold 5
Are placed along the upper surface 7d, the side surface 7e, and the groove 7c of the convex portion 7a of the lower mold 7.

In this state, the mold is clamped, and the molten resin heated to a predetermined temperature is injected and filled into the cavity 8 from the gate 6b. In this way, the container body 1 integrated with the lead frame 3 is molded. The lead frame 3 is a feeding member.
It is sent one after another by 3a and can be inserted into the first mold 5.

Next, after bonding and wiring the element 4 to the lead frame 3,
As shown in FIG. 3, the container body 1 is inserted into the second mold 9.

The second mold 9 is formed as a split mold including a lower mold 10 and an upper mold 11, and the lower mold 10 has a recess 10a into which the container body 1 is inserted. Further, on the parting surface 10b of the lower mold 10, on one side, a groove 10c for mounting the lead frame 3 pulled out from the container body 1 to the outside.
Is formed, and the slide core 12 that closes the opening of the container body 1 is provided on the other side. The slide core 12 is formed in a flat plate shape and is configured to move on the end surface 1b of the opening of the container body 1 into which the slide core 12 is inserted. As shown in FIG. 4, the opening of the container body 1 is closed by the leading edge 12a and the side edges 12b of the slide core 12,
12b is placed on the inner peripheral edge of the opening end face 1b of the container body 1. Further, as shown in FIG. 3, a heating element 12c is incorporated at the tip of the slide core 12.

Further, the upper mold 11 is formed with a recess 11a at a position corresponding to the recess 10a of the lower mold 10, and a cavity 13 is formed between the slide core 12 closing the opening of the container body 1 and the recess 11a. It is supposed to be done. Furthermore, the upper mold 11 has
A pressing member 14 having an L-shaped cross section is provided. Pressing member 14
The one surface portion 14a is arranged perpendicular to the parting surface 10b, and the other surface portion 14b is arranged parallel to the parting surface 10b. The lower end surface 14c of the surface portion 14a is located above the opening end surface 1b of the container body 1 on the side where the slide core 12 is inserted, and is arranged to form a part of the bottom surface 11b of the recess 11a. . Further, the pressing member 14 is movable in the vertical direction, and the lower end surface 14c of the surface portion 14a is the recessed portion 11.
It is movable up and down with respect to the bottom surface 11b of a. A hydraulic cylinder 15 is connected to the surface portion 14b of the pressing member 14, and the pressing member 14 can be moved up and down by the force of the hydraulic cylinder 15. Reference numeral 11c is a gate.

The container body 1 inserted into the second mold 9 is fitted in the recess 10a of the lower mold 10 and the lead frame 3 is placed in the groove 10c.

In this state, the slide core 12 is moved to close the opening of the container body 1. Further, the lower end surface 1 of the surface portion 14a of the pressing member 14
4c is aligned with the bottom surface 11b of the recess 11a of the upper mold 11.

Then, the mold is clamped, and the molten resin heated to a predetermined temperature is injected, injected, and filled into the cavity 13 from the gate 11c to mold the lid 2. At this time, a part of the end surface 1b of the opening of the container body 1 is melted by the injection of the heated molten resin and becomes integral with the lid body 2.

Next, after the lid body 2 is cooled and solidified, the slide core 12 is pulled out as shown in FIG. 5 so that its tip end is positioned on the end face 1b of the opening of the container body 1 on the slide core 12 insertion side. To The heating element at the tip of the slide core 12
12c is energized to heat the slide core 12 and melt the opening end surface 1b of the container body 1 and the portion of the lid 2 in contact with the slide core 12.

Next, after the slide core 12 is completely pulled out from the container body 1 and the lid body 2, the hydraulic cylinder 15 is operated downward, and the pressing member 14 causes the opening end face 1b of the container body 1 and the lid body 2 to be melted. Is pressed and welded. As a result, a hollow package that seals the element 4 is formed.

According to the hollow package molding method including the above steps, the step of molding the container body 1 by using the first mold 5 and the lid 2 at the opening of the container body by the second mold 9.
The element 4 is formed by two steps including the step of integrally molding
It is possible to mold a hollow package that seals. Therefore, it is possible to omit the conventional bonding or welding process of the container body 1 and the lid body 2, and it is possible to reduce the cost of the product using the element 4.

Further, since the container body 1 and the lid body 2 can be integrally molded with the same resin, a completely hermetically sealed hollow package can be molded. Therefore, the element 4 is less likely to be affected by the disturbance and is a highly reliable product.

Further, since the heating element 12c is incorporated in the tip portion of the slide core 12, the portion on the insertion side of the slide core 12 where the lid body 2 and the container body 1 are not joined at the time of molding the lid body 2,
By moving the heating element 12c to this portion and melting it, the heating element 12c can be integrally welded. Further, this portion is pressed by the pressing member 14 at the time of welding and can be completely integrated.

Furthermore, the container body 1 has a step portion that has been conventionally formed.
Since 1a is unnecessary, the structure of the first mold 5 can be simplified and the manufacturing cost of the mold can be reduced.

[Effects of the Invention] As described above, according to the present invention, a step of molding a container body having a flat opening end face integrally with the lead frame by the first mold, and a lead frame in the container body. The step of wiring the element to the second mold, the container body integrally having the lead frame and the element is inserted into the second mold, and the tip has a heat generating portion and is slid along the end face of the opening of the container body. After closing the opening with the flat slide core exposing the end surface, the opening end of the container body is closed by filling the cavity with the opening end surface and the slide core as part of the inner wall with molten resin. The step of integrally molding the lid body in the opening of the container body, and while pulling out the slide core from between the container body and the lid body, heat the heat generating portion provided at the tip of the slide core to generate the lid body and the container body. In between The pull-out port of the slide core formed is melted, part of the mold that forms the cavity is projected toward the cavity side, and the melted part of the lid placed at the pull-out port is pressed against the end face of the opening of the container body. Then, the hollow package for sealing the element can be formed. Therefore, it is possible to omit the conventional bonding or welding process between the container body and the lid, and it is possible to reduce the cost of a product using an element such as a silicon chip. Moreover, since the container body and the lid can be integrally molded with the same resin, a completely hermetically sealed hollow package can be molded. Therefore, the element is less susceptible to the influence of external disturbances and becomes a highly reliable product.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 5 are views showing an embodiment of the present invention, and FIG. 1 is a perspective view showing a container body of a hollow package,
2 is a cross-sectional view of the main part of the first mold, FIG. 3 is a cross-sectional view of the main part of the second mold, FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3, and FIG. FIG. 6 is an explanatory view showing a method of joining the container body and the lid body on the slide core insertion side, and FIG. 6 is a sectional view of the hollow package shown as a conventional example. 1 ... Container body, 2 ... Lid body, 3 ... Lead frame, 5 ... First mold, 9 ... Second mold.

Claims (1)

[Claims] 1. A lead frame is inserted into a first mold, and a flat opening end face is integrally formed with the lead frame so that a space is formed in a portion of the lead frame on which an element is mounted. A step of molding the container body having, a step of wiring an element to a lead frame in the container body, and inserting a container body integrally having the lead frame and the element into a second mold to generate heat at a tip portion. Part of the inner wall after closing the opening in a state where the end surface is exposed by a flat plate-shaped slide core that has a portion and is slid along the opening end surface of the container body. A step of integrally molding a lid body that closes the opening of the container body by filling the cavity with the molten resin, and a slide cover between the container body and the lid body. While pulling out, the heat generating portion provided at the tip of the mold heats up to melt the resin in the pulling port of the slide core formed between the lid body and the container body, and at the same time part of the mold that forms the cavity. A method for molding a hollow package for element sealing, which comprises a step of projecting to a cavity side and pressing a melted portion of a lid body arranged in the extraction port to an end surface of an opening of a container body to weld the same.