JPH01124226A - Molding die for resin sealing - Google Patents

Abstract

PURPOSE:To allow externally mounted packages of different widths to be easily formed by constituting a lateral side of the other side of a cavity by a wall member freely slidable to a gate in both approaching and departing directions. CONSTITUTION:Tools 10,... serving as wall members constructing walls positioned at the opposite end of a gate 5 are fitted in a recessed portions 3a, 3b. These tools 10,... are supported so that they are freely slidable relative to the gate 5 in both approaching and departing directions along the direction of arrow A, whereby in each tool 10 a long hole 10a for engagement is formed along the length and secured after being positioned to cavity blocks 1, 2 by a flush bolt 11 which passes through the long hole 10a. Thus by injecting a resin material into the cavity 3 through a runner 4 and the gate 5 after setting a clearance L1 between the gate which will make a lateral side of the cavity 3 in a mold and the tools 10,..., an externally mounted package 20 whose thickness is L1 is formed on a circumference around a lead frame 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mold for resin sealing used when sealing ICs and the like with resin.

C. Prior Art Conventionally, as this type of mold for resin sealing, a mold having a pair of upper and lower cavity blocks 1.2 as shown in the vertical cross-sectional view of FIG. 4 has been known. and,
On the upper surface of this lower cavity block 1, there are lower recesses 3a, 3a forming the lower side of a cavity 3.3 as a formwork space for forming an exterior package for sealing an IC (not shown). are formed on both sides thereof, and two runners 4 are provided between them to serve as a flow path for the resin material. In addition, this runner 4 and the lower recess 3a,
3a are connected to each other by gates 5, which are openings on the inner surfaces of the respective recesses 3a and are formed in an inclined shape toward the runners 4, and serve as injection ports for the resin material.

On the other hand, on the lower surface of the upper cavity block 2, there are formed upper recesses 3b, 3b that correspond to the lower recesses 3a, 3a and constitute the upper side of the cavity 3.3, respectively.These recesses 3b.

Recesses are formed on both sides of each of the lead frames 3b, into which both ends of the lead frame 6 on which the IC to be sealed is mounted are positioned and held.

In this mold, a pair of cavities 3, which are constituted by both cavities and tee blocks 1 and 2,
After installing and setting the lead frame 6°6 horizontally in each of the runners 3, the resin material supplied from the pot part (not shown) connected to the runner 4 is passed through a plunger (not shown). The resin material is injected into the cavities 3, 3 through the runners 4 and gates 5.5 by applying pressure to form an outer package (not shown) around the lead frame 6.6.

[Problem that the invention seeks to solve]

By the way, in the mold having the above structure, the size of the cavity 3 constituted by the cavity block 1.2, especially the dimension in the width direction, is fixed constant, so that only an exterior pan cage of a single shape can be used. can only be manufactured. Therefore, if the number of lead terminals of the lead frame 6 or the dimensions of the outer package are changed, it is necessary to prepare many molds with different specifications according to the change, which increases the cost of manufacturing and storing them. There was a problem.

This invention was devised to solve these problems, and aims to provide a mold for resin sealing that can easily form exterior pancages with different width dimensions. .

[Means for solving problems]

In order to achieve the above object, the present invention includes a cavity configured by a pair of upper and lower cavity blocks, a gate opened on one side of the cavity, and a runner for injecting a resin material into the cavity through the gate. , in a resin sealing mold for forming an exterior package of a predetermined shape around a lead frame installed horizontally in the cavity, the other side surface of the cavity is slidable in a manner that allows the other side of the cavity to move freely toward and from the gate; It is characterized by being composed of movable wall members.

[Effect]

According to the above configuration, if the resin material is injected into the cavity with the wall member set close to the gate, an exterior package with a narrow width dimension is formed, and when the wall member is set away from the gate, an exterior package with a narrow width dimension is formed. If you inject the resin material,
An exterior puff cage with a wide width dimension is formed.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1(a) is a longitudinal cross-sectional view showing the main parts of the mold for resin sealing, and FIG. 1(b) is a perspective view showing the main parts of the lower cavity block of FIG. 1(a). . This embodiment is basically the same as the conventional example except that the other side of the cavity is constructed of a slidable wall member, so parts in FIG. 1 that are the same as or equivalent to those in FIG. 4, The same reference numerals are given to the parts, and the explanation thereof will be omitted.

In this embodiment, a cavity 3 is provided on the upper surface of the lower cavity block 1 and the lower surface of the upper cavity block 2.
．． Lower recesses 3a, 3a and 3b, 3b are provided, respectively, which are formed long along the direction away from the gates 5, 5 opened on one side surface of the recess 3a, that is, the inner surface.

3b includes a tool 10 as a wall member forming a wall surface located on the opposite side of the gate 5. ... are fitted.

And these tools 10. . . . are supported so as to be able to freely slide toward and away from the gate 5 along the direction of the arrow in the figure, that is, with respect to the gate 5.

Therefore, each tool 10 is formed with a retaining elongated hole 10a along its longitudinal direction, and the cavity block 1.
It is positioned and fixed at 2.

Therefore, as shown in FIG. 1, a gate 5 and a tool 10.・
By setting the distance from the lead frame 6 to Ll and injecting the resin material into the cavity 3 through the runner 4 and the gate 5, the lead frame 6 will be separated from the lead frame 6 as shown in the plan view of FIG. 3(a). Exterior package 2 with width dimension Ll around
0 will be formed.

Also, each sinking bolt 11 is loosened and each tool 10 is slid in the direction of arrow A to a predetermined position away from the gate 5, and as shown in FIGS. By setting the distance between both sides to L2 and fixing them again, by injecting the resin material into the cavity 3, the width dimension around the lead frame 6 can be set as shown in FIG. 3(b). The outer puff cage 21 of L2 will be formed.

In the above description, the tool 10 is configured to be slidable by the elongated hole 10a and the sink bolt 11, but the tool 10 is not limited to this, and may be configured to be slidable by other configurations. Needless to say.

〔Effect of the invention〕

As explained above, according to the mold for resin sealing according to the present invention, the other side of the cavity is constituted by a wall member that can freely slide near and far with respect to the gate opened on one side. Therefore, if the resin material is injected into the cavity with the wall member close to the gate, an exterior puff cage with a narrow width dimension will be formed, and if the resin material is injected with the wall member away from the gate. In this way, an exterior package with a wide dimension in the width direction is formed.

Therefore, it is possible to easily form exterior packages with various widthwise dimensions using one mold.

[Brief explanation of the drawing]

1 to 3 relate to embodiments of the present invention, and FIG.
a) is a vertical cross-sectional view showing the main parts of the mold for resin sealing;
FIG. 1(b) is a perspective view showing the main parts of the lower cavity block in FIG. 1(a), and FIGS. 2(a) and (b) are a vertical sectional view and a perspective view corresponding to FIG. 1, respectively. FIG. 3 is a plan view showing an exterior puff cage formed on the lead frame. Furthermore, FIG. 4 is a longitudinal cross-sectional view showing the main parts of a mold according to a conventional example. In the figure, 1 is the lower cavity block, 2 is the upper cavity block, 3 is the cavity, 4 is the runner, and 5 is the cavity block.
is a gate, 6 is a lead frame, 10 is a tool (wall member), and 20.21 is an exterior package. Note that the same reference numerals in the drawings indicate parts and portions that are the same or correspond to each other.

Claims (1)

[Claims] (1) A cavity formed by a pair of upper and lower cavity blocks, and a gate opened on one side of the cavity,
a runner for injecting a resin material into the cavity through the gate, and forming an exterior package of a predetermined shape around a lead frame installed horizontally in the cavity; A mold for resin sealing, characterized in that the other side of the cavity is constituted by a wall member that can freely slide toward and away from the gate.