JPH0770744B2 - Semiconductor device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor device structure, and more particularly to a semiconductor device package structure that requires the surface of a semiconductor element to receive external light.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a semiconductor device package in which a transparent element 8 made of glass is used as a part of a semiconductor device so that a light receiving element on the surface of the semiconductor element can receive light is made of ceramic material in advance. A lead frame 4 formed of a conductive metal material is sandwiched between the formed upper package 2 and lower package 3 to form the package. At that time, the upper package 2 and the lead frame 4 and the lower package 3 and the lead frame 4 are bonded to each other through the glass 9 that is heated and melted.

After the semiconductor element 6 is mounted on the lower package 3 of the cavity case with the paste-like resin 5, the semiconductor element 6 and the inner lead 4a are connected by the fine metal wire 7. Next, the upper surface of the cavity case is sealed with a transparent body 8 such as glass. At that time, the glass 9 having a lower melting point than the transparent body 8 was heated and melted to bond the cavity case and the transparent body.

Finally, the outer lead 4b is cut and molded from the lead frame 4 using a mold or the like to form a semiconductor device. Further, in the full mold package type, JP-A-62-136050 and JP-A-1-27 are available.
There is also one in which a groove portion having a meandering pattern is provided on the back side of the island as in Japanese Patent No. 8755, and one in which the island is divided into a plurality of parts.

[0005]

The semiconductor device using a transparent body as a part of the above-mentioned conventional semiconductor device has a drawback that the package occupies too high a cost ratio.
Approximately describing the cost ratio, semiconductor devices are about 20%,
Material costs including packages account for 70% of the total assembly man-hours. Therefore, in order to reduce the cost of the package, it is necessary to change the material of the package from ceramic to plastic, and structurally, the island 1 which is not necessary until now is provided below the mounting portion of the semiconductor element 6. I won't.

In the conventional ceramic case, since the difference in thermal expansion between the ceramic and the semiconductor element is the same, the island is not necessary, but in the plastic case, the difference in expansion between the plastic and the semiconductor element is 8 within a temperature difference range of 150 degrees.
Since about 0 μm is generated, stress is applied to the semiconductor element, which causes a problem in the life of the semiconductor element. Therefore, the metal island is necessary.

The lead frame provided with the islands is mounted in a package molding die, and a plastic resin is injected to manufacture the package. As a result, as shown in FIG. 4, the island 1 has a difference in thermal expansion between the plastic and metal islands. There was a problem that the protrusions were formed to have a thickness of about 0.1 to 1 mm. It is necessary to suppress the warp standard of the island to within 20 μm. Further, if the conventional example of Japanese Patent Laid-Open No. 62-23605 in which the island is divided into a plurality of parts is directly applied to the plastic package, the warp is reduced in proportion to the divided length, but the standard within 20 μm is satisfied. You cannot do it. Further, in Japanese Patent Laid-Open No. 1-278735, since the island having the same contents as described above remains integrated, there is a problem that warpage of about 0.1 to 1 mm occurs.

An object of the present invention is to provide a semiconductor device in which a thermosetting plastic resin case with less warp of islands is used.

[0009]

To achieve the above object, a semiconductor device according to the present invention comprises a cavity case,
A semiconductor device having a transparent body, a semiconductor element, and an island, wherein the cavity case has a hollow structure made of plastic resin, and the transparent body closes an opening of the cavity case. The element is
The semiconductor device is provided in the cavity case and receives external light through the transparent body. The island is formed by protruding from the inner bottom portion of the cavity case to a ridge, and is formed into a continuous meandering shape. Is installed.

The semiconductor device according to the present invention is a semiconductor device having a cavity case, a transparent body, a semiconductor element, and an island, and the cavity case has a hollow structure made of plastic resin. The transparent body closes the opening of the cavity case,
The semiconductor element is provided in the cavity case, receives external light through the transparent body, and the island is
The semiconductor device is mounted by protruding from the inner bottom portion of the cavity case to a convex line to form a hollow ellipse shape and connecting the hollow ellipses at one point.

[0011]

Since the island is formed by protruding from the inner bottom of the package to a convex line and has a meandering shape or a hollow shape, the island is deformed according to the shrinkage amount of the plastic package and absorbs the shrinkage amount. .

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a perspective view showing a semiconductor device according to Embodiment 1 of the present invention, and FIG. 2 is a longitudinal sectional view of the same.

In the figure, the upper package 2 rises from the peripheral edge of the lower package 3, and the lower package 3 and the upper package 2 form a cavity case having a hollow structure inside. The upper package 2 and the lower package 3 are made of thermosetting plastic resin. Further, a part of the lead frame 4 made of a conductive metal is embedded in the upper package 2, and an inner lead 4a on the inner end side thereof is inserted in the cavity case. On the other hand, the outer leads 4b of the lead frame 4 are exposed outside the cavity case.

Further, the metal island 1 is provided so as to project from the surface of the lower package 3 in a convex shape, and is formed continuously and meandering in the longitudinal direction of the package. On this island 1, the semiconductor element 6 has a paste-like resin 5
And the semiconductor element 6 and the inner lead 4a are electrically connected by the thin metal wire 7.

The upper opening of the cavity case is sealed with a transparent body 8 such as glass. The semiconductor element 6 receives light through the transparent body 8.

In this semiconductor package manufacturing method, a die processed into upper and lower package shapes is used as a sealed upper and lower die, and a lead frame 4 made of a conductive metal is attached to the die and the die is formed. The thermosetting plastic resin that has been heated and melted is injected into the mold to form the upper package 2
A cavity case including the lower package 3 and the lower package 3 is molded. The semiconductor device is formed by providing the island 1 corresponding to a part of the cavity case so as to be raised from the surface of the lower package 3 in a convex shape and meandering in the longitudinal direction of the package.

According to the present invention, the plastic packages 2 and 3 are metal islands when the package is taken out into the air (returned to room temperature from 180 degrees) after the resin injection is completed at the time of manufacturing the package (mold heating temperature is 180 degrees). Although it shrinks more than 1, the island structure deforms the shrinkage of the plastic and absorbs the shrinkage of the plastic, so that the island 1 does not warp.

(Second Embodiment) FIG. 5 is a perspective view showing a second embodiment of the present invention. The island 1 according to the present embodiment rises upward from the surface of the lower package 3 and is formed in a hollow elliptical shape, and the hollow elliptical portions 1a are arranged in the length direction of the package, and adjacent hollow elliptical portions 1a, 1a. They are connected to each other via a straight portion 1b having a short distance.

In this embodiment, the hollow elliptical portion 1a of the island 1 is deformed to absorb the shrinkage amount of the packages 2 and 3.

[0021]

As described above, according to the present invention, it is possible to replace the conventional case where the case portion of the semiconductor device is made of ceramic with a thermosetting plastic resin case having a small island warp, thereby reducing the material cost. About 5
A cost reduction of 0% can be realized.

[Brief description of drawings]

FIG. 1 is a partially sectional perspective view showing a semiconductor device according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of the same.

FIG. 3 is a cross-sectional view showing a conventional example.

FIG. 4 is a perspective view showing an island sled.

FIG. 5 is a partially sectional perspective view showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Island 2 Upper Package 3 Lower Package 4 Lead Frame 4a Inner Lead 4b Outer Lead 5 Paste Resin 6 Semiconductor Element 7 Metal Wire 8 Transparent Body 9 Molten Glass

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H01L 23/50 U

Claims (2)

[Claims] 1. A semiconductor device having a cavity case, a transparent body, a semiconductor element, and an island, wherein the cavity case has a hollow structure made of plastic resin, and the transparent body has an opening of the cavity case. The semiconductor element is provided in the cavity case and receives external light through the transparent body, and the island is formed by protruding from the inner bottom portion of the cavity case to the ridge, and A semiconductor device, characterized in that it is formed in a continuously meandering shape and has a semiconductor element mounted thereon. 2. A semiconductor device having a cavity case, a transparent body, a semiconductor element, and an island, wherein the cavity case has a hollow structure made of plastic resin, and the transparent body has an opening of the cavity case. The semiconductor element is provided inside the cavity case and receives external light through the transparent body.The island is bulged from the inner bottom of the cavity case to a convex line and has a hollow elliptical shape. A semiconductor device, which is formed and has hollow ellipses connected at one point, and a semiconductor element is mounted thereon.