JPH06120771A - Electronic parts - Google Patents

Abstract

PURPOSE:To provide electronic parts which have such structure that the penetration of a sealing material in the fused state to the storage part of a case is difficult at the time of hermetically sealing the storage part of the case by the sealing material. CONSTITUTION:A base member 20 which is arranged in the aperture part of the case and prevents a sealing material 30 from penetrating the storage part of the case is provided with a U-shaped cut 21 and I-shaped cuts 22 and 23 to be pierced by external connection parts 10b, 11c, and 14c of lead terminals 10, 11, and 14. The lead terminal 10 is provided with a projecting piece 10d, which has enough area to cover the hole formed in the base member 20 by the cut 21, across the cut 21 Consequently, the hole formed by the cut 21 is closed by the projecting piece when the base 20 is pierced by the lead terminal 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component, such as a ladder type filter, for closing an opening of a substantially box-shaped case with a sealing material for sealing to seal a housing portion of the case.

[0002]

2. Description of the Related Art Conventionally, there is an electronic component having a structure in which an electric functional element and lead terminals are housed in a housing portion of a case having a substantially box shape. This electronic component needs to close the opening of the case with a sealing material. At this time, the base member 40 illustrated in FIG. 5 is disposed in the opening of the case in order to prevent the molten sealing material from entering the housing of the case. The base member 40 is usually formed with a U-shaped notch 41 and I-shaped notches 42 and 43 for penetrating the external connection portion of the lead terminal.

When the notch is formed in the portion near the center of the base member 40, I-shaped notches 42 and 43 are adopted. When the notch is formed at the edge of the base member 40, the U-shaped notch 41 is used to easily secure at least a certain distance from the end of the base member 40 in consideration of manufacturing tolerance. If the distance between the end of the base member 40 and the notch becomes too short, the mechanical strength of the notch becomes weak and it becomes impossible to prevent the molten sealing material from entering the housing portion of the case. Is.

By the way, as shown in FIGS. 6 and 7, I
When the lead terminals 45 and 46 are respectively passed through the U-shaped notch 42 (which may be the I-shaped notch 43) and the U-shaped notch 41, the tongue pieces 41a and 42a of the notches 41 and 42 are formed.
The notch 41 has a larger deflection. Therefore, the hole 48 formed in the U-shaped notch 41 is wider than the hole 49 formed in the I-shaped notch 42, and the penetration of the molten sealing material 50 occurs more frequently in the U-shaped notch 41. When the sealing material 50 enters the housing portion of the case 1, the electrical characteristics of the electrical functional element are deteriorated, and the electronic component is defective.

Therefore, an object of the present invention is to provide an electronic component having a structure in which a molten sealing material is unlikely to enter the housing portion of the case when the housing portion of the case is sealed with the sealing material. .

[0006]

In order to solve the above problems, an electronic component according to the present invention is inserted into (a) a substantially box-shaped case and (b) a housing portion of the case. An electric functional element; (c) a sealant for sealing the housing of the case; and (d) a base member provided in the opening of the case and having a cutout for penetrating lead terminals,
(E) A protrusion that is inserted into the housing portion of the case and has an external connection portion that extends from the notch for penetrating the lead terminal of the base member and has an area sufficient to close the hole formed in the base member by the notch. And a lead terminal provided at a portion intersecting the cut.

In the above structure, since the lead terminal is provided with the projecting piece, when the lead terminal penetrates the cut, the projecting piece closes the hole formed in the cut. Therefore, the molten sealing material is less likely to enter the housing portion of the case.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an electronic component according to the present invention will be described below with reference to the accompanying drawings. This embodiment will be described by taking a ladder type filter as an example of the electronic component. As shown in FIGS. 1 and 2, the ladder-type filter has a substantially box-shaped case 1.
And four piezoelectric resonators 5, 6, 7, and 8, an input terminal 10 and an output terminal 11, a relay terminal 12, and a ground terminal 14.
It consists of and. The piezoelectric resonators 5, 6, 7 and 8 as electric functional elements are well known in which electrodes are provided on the front and back surfaces, respectively.

The input terminal 10 includes a contact piece 10a, an external connecting portion 10b, a protrusion 10c, and a protrusion 10d.
Are in pressure contact with the upper surface of the piezoelectric resonator 5. The projecting piece 10d has a sufficient area for closing a hole formed in a U-shaped notch 21 described later. The output terminal 11 is formed by bending the contact piece 11a and overlapping the contact piece 11b and the external connection portion 1.
1c and protrusions 11d and 11e, the protrusion 11d is in pressure contact with the lower surface of the piezoelectric resonator 7, and the protrusion 11e is in pressure contact with the upper surface of the piezoelectric resonator 8. The relay terminal 12 includes the contact pieces 12a, 1
2b is provided with a contact piece portion 12c, which is bent and double overlapped, a relay piece portion 12d, and protrusions 12f, 12g, 12h,
The protrusion 12f is pressed against the lower surface of the piezoelectric resonator 5, and the protrusion 12g
Is pressed against the upper surface of the piezoelectric resonator 6, and the protrusion 12h is pressed against the lower surface of the piezoelectric resonator 8.

The ground terminal 14 comprises a contact piece 14a, a contact piece 14b which is bent and superposed in a double manner, an external connecting portion 14c, and projections 14d and 14e. The projection 14d is pressed against the lower surface of the piezoelectric resonator 6, The protrusion 14e is in pressure contact with the upper surface of the piezoelectric resonator 7. The piezoelectric resonators 5, 6, 7, 8 and the terminals 10, 11, 12, 14 are inserted into the housing portion 1b through the opening 1a of the case 1.

A base member 20 is set on the stepped portion of the opening 1a of the case 1, and the case member 20 prevents a sealing material 30 described later from entering the housing portion 1b of the case 1. The base member 20 is made of insulating paper, and as shown in FIG. 3, the external connection portion 10 of the lead terminals 10, 11, 14 is connected.
U-shaped notches 21 and I-shaped notches 22 and 23 are formed to penetrate b, 11c, and 14c, respectively. The notches 21, 22 and 23 are the tongue pieces 21a and 2 respectively.
It has 2a and 23a. These tongue pieces 21a-23
When the lead terminals 10, 11, and 14 are penetrated, a bends and causes holes in the cuts 21 to 23.

FIG. 4 shows the U-shaped notch 21 and the lead terminal 10
Shows a state in which is penetrated. The protrusion 10d closes the hole 28 formed in the U-shaped cut 21. After the base member 20 is set in the opening 1a of the case 1, the sealing material 30 made of a semi-cured epoxy resin is opened in the opening 1a.
Inserted in. Next, the sealing material 30 is heated to be fully cured. At this time, the sealing material 30 is temporarily in a molten state. However, since the holes of the I-shaped notches 22 and 23 are narrow and the hole 28 of the U-shaped notch 21 is closed by the projecting piece 10d, the sealing material 30 in the molten state enters the housing portion 1b of the case 1. Without doing so, it is fully cured to seal the housing portion 1b of the case 1. Each terminal 10, 11, 14
The external connection portions 10b, 11c, and 14c are bent along the side surface and the bottom surface of the case 1 after the encapsulating material 30 is cured (see FIG. 2), and each have a surface mounting type shape.

The electronic component according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the gist thereof. Although the ladder type filter has been described in the above embodiments, the present invention is not limited to this, and any electronic component may be used as long as it seals the housing of the case with a sealing material.

Further, in the U-shaped notch 21 illustrated in FIG. 3, if the tip of the tongue 21a is cut out and removed, the hole formed in the notch 21 becomes smaller, so that the molten sealing material of the case is removed. The structure can further prevent the invasion into the accommodation portion.

[0015]

As is apparent from the above description, according to the present invention, the lead terminal is provided with the projecting piece having an area sufficient to close the hole formed in the cut, so that the lead terminal penetrates the cut. The resulting hole can be completely closed by the protrusion. Therefore, when the housing portion of the case is sealed with the sealing material, the molten sealing material is less likely to enter the housing portion of the case. As a result, it is possible to obtain an electronic component in which the deterioration of the electrical characteristics of the electric functional element due to the penetration of the sealing material does not easily occur.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an electronic component according to an embodiment of the present invention during assembly.

FIG. 2 is a partial vertical sectional view of the electronic component shown in FIG.

FIG. 3 is a plan view of the base member shown in FIG.

4 is a cross-sectional view showing a state in which the lead terminal penetrates a U-shaped cut provided in the base member shown in FIG.

FIG. 5 is a plan view of a conventional base member.

6 is a cross-sectional view showing a state in which the lead terminal penetrates a U-shaped cut provided in the base member shown in FIG.

FIG. 7 is a cross-sectional view showing a state in which the lead terminal penetrates an I-shaped cut provided in the base member shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Case 1a ... Opening part 1b ... Housing part 5,6,7,8 ... Piezoelectric resonator 10,11,14 ... Terminals 10b, 11c, 14c ... External connection part 10d ... Projection piece 20 ... Base member 21 ... U-shape Notch 30 ... Sealing material

Claims (1)

[Claims] 1. A case having a substantially box shape, an electric functional element inserted into a housing portion of the case, a sealing material for sealing the housing portion of the case, and an opening provided in the case. And a base member having a cutout for penetrating the lead terminals, and inserted into the housing portion of the case, the external connection portion is led out from the cutout for penetrating the lead terminals of the base member, and is generated in the base member by the cut. And a lead terminal having a projecting piece having an area sufficient to close the hole at a portion intersecting with the cut, and an electronic component.