JPH0531345U - Electronic parts - Google Patents

Abstract

(57) [Summary] [Object] To provide an electronic component in which the resin for sealing the case is less likely to adhere to the tips of the terminals extending from the electronic component body in the case. The ceramic filter 1 includes a box-shaped case 2 having an opening 2a, a laminated filter member group 4 (electronic component body) housed in the case 2, an extension from the laminated filter member group 4, and a protrusion from the opening 2a. A plurality of lead portions 6b and a sealing material 12 that seals the opening 2a. Each lead portion 6b has a protruding portion 6c that bends toward the outer peripheral side of the opening 2a, and each protruding portion 6c compresses the rubber layer 5 (elastic member) arranged on the opening end surface 2b of the case 2. There is. The encapsulating material 12 is transmitted to the case 2 through the protruding portion 6c.
Since the rubber layer 5 prevents the sealing material 12 from flowing out to the outer peripheral side, the sealing material 12 is unlikely to adhere to the protruding portion 6c.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electronic component, and more particularly to an electronic component in which a main body of the electronic component is housed in a box-shaped case having an opening.

[0002]

[Prior Art]

 A conventional electronic component in which an electronic component body is housed inside a box-shaped case having an opening has a terminal extending from the electronic component body and protruding from the opening of the case. The opening of the case is sealed with a sealing material such as epoxy resin. There is an electronic component using such an electronic component as a surface mount type electronic component in which the protruding portion of the terminal is bent toward the outer peripheral side of the opening. In this case, the projecting portion of the terminal contacts the opening end surface of the case and extends in the outer direction of the case.

[0003]

[Problems to be solved by the device]

 When sealing the opening of the conventional electronic component, a liquid sealing resin is injected into the opening. Then, the sealing resin moves along the terminals due to the surface tension. In particular, in the case of surface-mounted electronic components, since the protruding portion of the terminal extends parallel to the opening surface, the sealing resin easily reaches the tip of the terminal. If the sealing resin adheres to the protruding parts of the terminals, the soldering area of the terminals will be reduced, and the required soldering strength will not be obtained during surface mounting.

In order to solve such a problem, it is possible to use a high-viscosity sealing resin, but in this case, it is difficult for the sealing resin to spread to every corner of the opening, and a sealing failure occurs. easy. An object of the present invention is to provide an electronic component in which the sealing resin does not easily adhere to the tip of the terminal extending from the electronic component body in the case.

[0005]

An electronic component according to the present invention includes a box-shaped case having an opening, an electronic component main body housed inside the case, a portion extending from the electronic component main body and bent toward the outer peripheral side of the opening. And a terminal that protrudes, and a sealing resin that seals the opening of the case. A compressible elastic member is disposed on the opening end surface of the case.

[0006]

[Action]

 In the electronic component according to the present invention, the projecting portion of the terminal can compress the elastic member arranged on the end face of the case opening. Therefore, when the liquid sealing resin is injected into the opening of the case, the flow of the sealing resin transmitted through the terminal is regulated at the pressure contact portion between the protruding portion and the elastic member. Therefore, the sealing resin does not easily adhere to the tip of the terminal.

[0007]

【Example】

 1 and 2 show a ladder type ceramic filter according to an embodiment of the present invention. In the figure, the ladder-type ceramic filter 1 is mainly composed of a box-shaped case 2, a lid 3, and a laminated filter member group 4 housed in the case 2. The case 2 is made of resin such as PBT resin or PPS resin, and is a hollow and substantially rectangular parallelepiped member. An opening 2a is formed at one end of the case 2, and a step portion 2c is formed on the inner peripheral side of the opening end surface 2b of the case 2. A rubber layer 5 (an example of an elastic member) made of silicon rubber is formed on the entire circumference of the opening end surface 2b of the case 2. The thickness of the rubber layer 5 is set to be slightly larger than the distance between the opening end surface 2b of the case 2 and the protrusion 6c (described later) of each terminal plate.

The laminated filter member group 4 housed in the case 2 has a first terminal plate 6, a series resonator 7, a second terminal plate 8, a parallel resonator 9, and a third terminal plate 10 in order from the bottom of the drawing. , The spring terminal plates 11 are stacked. The first terminal plate 6 is a conductive member such as iron whose entire surface is plated with solder. The lead portion 6b is mainly composed of a lead portion 6b and a protruding portion 6c which is bent from the tip of the lead portion 6b to the outer peripheral side of the case 2 at a substantially right angle. As shown in FIG. 2, the protrusion 6c is in pressure contact with the rubber layer 5 formed on the open end surface 2b of the case 2, and the rubber layer 5 is compressed. The main body 6a integrally has a protrusion 6d at the center of the upper surface.

The second terminal plate 8 and the third terminal plate 10 have a structure similar to that of the first terminal plate 6, and are mainly composed of main bodies 8a and 10a, lead portions 6b, and protruding portions 6c, respectively. Has been done. The protruding portions 6 c of the second terminal plate 8 and the third terminal plate 10 are pressed against the rubber layer 5 like the protruding portions 6 c of the first terminal plate 6. The second terminal plate 8 integrally has a protrusion 8b at the center of both surfaces of the main body 8a. The third terminal plate 10 integrally has a protrusion 10b at the center of the lower surface of the main body 10a (FIG. 2).

The series resonator 7 is a plate-shaped member made of a piezoelectric ceramic and has a substantially square shape. Silver electrodes are formed on both surfaces of the series resonator 7 (not shown). The projection 6d of the first terminal plate 6 and the projection 8b of the second terminal plate 8 are in contact with the lower surface and the upper surface of the series resonator 7, respectively. The parallel resonator 9 is a piezoelectric ceramic plate-like member similar to the series resonator 7, and has a substantially square shape. The lower surface and the upper surface of the parallel resonator 9 are in contact with the protrusion 8b of the second terminal plate 8 and the protrusion 10b of the third terminal plate 10, respectively.

The spring terminal 11 has elasticity in the vertical direction in the figure, and is for pressing the laminated filter member group 4 against the bottom wall of the case 2 to stabilize it in the case 2. The lid 3 is a member made of paper or a resin similar to the case 2, is formed in a plate shape having a shape facing the opening 2a of the case 2, and is arranged on the step 2c of the opening 2a. . The lid 3 has a cut portion 3a at a position corresponding to each lead portion 6b of each terminal plate 6, 8, 10 and passes through each cut portion 3a. Respective lead portions 6b extending therefrom project from the opening 2a. A sealing material 12 made of epoxy resin is arranged on the lid body 3 to hermetically seal the opening 2a of the case 2.

An equivalent circuit of this ceramic filter 1 is shown in FIG. In FIG. 4, corresponding parts are designated by the same reference numerals. As is apparent from the drawing, each protrusion 6c of the first terminal plate 6 and the second terminal plate 8 is an input / output terminal, and the protrusion 10c of the third terminal plate 10 is a ground terminal. Next, a method of manufacturing the ladder type ceramic filter 1 will be described.

First, the case 2 is prepared, and the rubber layer 5 is arranged on the opening end surface 2b thereof. The rubber layer 5 can be formed by applying silicone rubber by screen printing and curing it with ultraviolet rays or heat. Next, each member of the laminated filter member group 4 is housed in the case 2 in the above order. When the multilayer filter member group 4 is housed, the opening 2 a of the case 2 is sealed by the lid 3. Here, each lead portion 6b of each terminal plate 6, 8, 10 is penetrated into the cut portion 3a of the lid body 3, and the lid body 3 is arranged on the stepped portion 2c.

Next, an epoxy resin as the sealing material 12 is injected onto the lid 3. The injected epoxy resin tries to move to the outer surface side of the case 2 through the lead portions 6b and the protruding portions 6c due to the surface tension. However, since the protruding portion 6c compresses the rubber layer 5 on the opening end surface 2a of the case 2, the flow of the epoxy resin is restricted by the rubber layer 5 as shown in FIG. In particular, since the rubber layer 5 is made of silicone rubber that has a function of repelling the epoxy resin, the epoxy resin does not easily move to the outer peripheral side of the case 2.

As described above, since the flow of the epoxy resin is regulated by the rubber layer 5, the epoxy resin is less likely to adhere to the tip portion of the protruding portion 6c. Therefore, in the ladder-type ceramic filter 1, the solder wetting area of each protrusion 6c is sufficiently secured during surface mounting, so that sufficient soldering strength can be obtained. Further, the rubber layer 5 reduces the contamination of the outer surface of the case 2 by the sealing resin.

[Other Embodiments] (a) In the above embodiment, the rubber layer 5 as the elastic member is arranged on the entire circumference of the opening end face 2b of the case 2, but the rubber layer 5 is formed on each protruding portion of each terminal board. You may arrange | position only in the part corresponding to 6c. (B) In the above embodiment, the rubber layer 5 is made of silicon rubber, but the rubber layer 5 may be made of another elastic member. (C) In the above-described embodiment, the terminal plate in which the lead portion is bent in advance is used, but the lead portion may be bent after the sealing resin is filled on the lid. Also in this case, the same effect as described above can be obtained by pressing the bent portion of the lead portion against the rubber layer. (D) In the above embodiment, the case where the present invention is applied to the ladder type filter in which one series resonator and one parallel resonator are combined is explained. However, regarding the ladder type filter having three or more resonators, The present invention can be implemented similarly. (E) The present invention is not limited to a filter, but may be applied to other electronic components.

[0017]

[Effect of the device]

 In the electronic component according to the present invention, the protruding portion of the bent terminal can compress the elastic member formed on the opening end surface of the case. Therefore, in this electronic component, the sealing resin is unlikely to adhere to the tips of the terminals extending from the electronic component main body in the case.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

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

FIG. 3 is an enlarged partial view of FIG.

FIG. 4 is an equivalent circuit diagram of the embodiment.

[Explanation of symbols]

 1 Ladder Type Ceramic Filter 2 Case 2a Opening 2b Opening End Face 4 Laminated Filter Member Group 5 Rubber Layer 12 Sealant

Front page continued (72) Kazuo Nakamura 1-1 Yamashita-cho, Kokubun-shi, Kagoshima Prefecture Kyocera Stock Company, Kagoshima Kokubun Plant (72) Shibata Shigehiro 1-1, Yamashita-cho, Kokubu City, Kagoshima Prefecture Kyocera Stock Company, Kagoshima Kokubu Plant

Claims (1)

[Scope of utility model registration request] 1. A box-shaped case having an opening, an electronic component main body housed inside the case, a terminal extending from the electronic component main body and bent and protruding toward the outer peripheral side of the opening, An electronic component provided with a sealing resin for sealing an opening, wherein a compressible elastic member is arranged on an opening end surface of the case.