JPH0818385A - Electronic component with lead terminal and its manufacture - Google Patents

Abstract

PURPOSE:To obtain the electronic component with the lead terminal which can be improved in the mechanical strength of the lead terminal while the cost is reduced and the labor is saved, and easily mounted by utilizing an automatic component inserting machine. CONSTITUTION:The electronic component with the lead terminal is equipped with a thin metallic terminal 3 consisting of a flat plate part 4 which supports a ceramic element 1 stored in a case 2 and a lead part 5 which is extended from the flat plate part 4 to project out of the case 2. The joined end surfaces of a thick lead terminal 8 is connected by butt welding to the surface of the outside end part of the lead part 5 which projects out of the case 2 and is bent orthogonally to the projection direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component with a lead terminal and a method for manufacturing the same, and more particularly to a structure and a method for adding a lead terminal to a lead portion of a metal terminal.

[0002]

2. Description of the Related Art Conventionally, some electronic parts are said to have a lead terminal, and an example of an electronic part with a lead terminal is shown in an assembled sectional view of FIG. 3 and an exploded perspective view of FIG. There is a piezoelectric resonator configured. That is, the piezoelectric resonator includes a ceramic element 1 that performs a required operation such as area vibration or length vibration, a case 2 including a case body 2a and a case lid 2b, and a ceramic element 1 housed in the case 2. A pair of metal terminals 3 for holding
It is provided with. Then, each of the metal terminals 3 at this time is extended from the flat plate portion 4 supporting the ceramic element 1 housed in the case 2 to be conductive, and a narrow width shape from one end of the flat plate portion 4. The metal terminal 3 is composed of a long lead portion 5 penetrating the seal portion 6 and extended to the outside of the case 2. The metal terminals 3 are formed by punching a thin metal plate having a thickness of about 0.1 mm into a known hoop shape. After the press working, the flat plate portion 4 is cut and removed only in the hoop portion 3a connected to the lead portion 5 incorporated in the case 2.

Reference numeral 7 in the figure denotes a truncated cone-shaped contact portion which is provided at a substantially central position of the flat plate portion 4. The contact portion 7 is an electrode (not shown) of the ceramic element 1. Is in contact with. Although not shown here, electronic components with lead terminals such as piezoelectric resonators are generally mounted on the surface of the wiring board using an automatic component insertion machine, The lead portions 5 of the metal terminals 3 drawn out to the outside of the case 2 are inserted into the through holes of the wiring board and then soldered and joined.

[0004]

By the way, in the above-described conventional piezoelectric resonator, the long lead portion 5 forming the metal terminal 3 has a thin and narrow shape and has a small mechanical strength. Since the lead portion 5 is deformed, the lead portion 5 cannot be inserted into the through hole due to its deformation, or the unnecessary outer end portion of the lead portion 5 that penetrates the through hole and protrudes to the back surface side of the wiring board is cut and bent. There was a problem that things became difficult. Therefore, in the related art, it is attempted to avoid the above inconvenience by adopting the following means.

That is, as one of the means, as shown in FIG. 5, the tip of the lead portion 5 which penetrates the seal portion 6 and is drawn out to the outside of the case 2 is formed into a round bar shape having a large thickness while forming a round shape. The lead terminals 8 which have been described above are replenished by crimping. However, in such a case, not only the labor and processing cost for crimping the lead terminal 8 by molding the lead portion 5 are required, but also the crimping length is short if the product height is limited. Since it is unavoidable, the mechanical strength between the lead portion 5 and the lead terminal 8 is reduced. In addition, since there is concern about electrical continuity only by crimping, it is necessary to achieve electrical continuity by soldering the lead portion 5 and the lead terminal 8.
This causes further labor and cost increase.

Further, when a piezoelectric resonator with lead terminals constructed by adopting such a means is mounted on a wiring board, the mounting height becomes high and the caulked portion is exposed to the outside. Since it remains as it is, there is a problem that reliability such as durability remains uncertain.

On the other hand, as another means, as shown in FIG. 6, the outer peripheral surface of the lead terminal 8 in the shape of a round bar is attached to the front end side surface of the lead portion 5 drawn out to the outside of the case 2. It is considered to add them by spot welding after applying them. However, since a plating layer such as solder is usually formed on the outer peripheral surface of the lead terminal 8, it is very difficult to join the lead portion 5 and the lead terminal 8 with a sufficient strength, In addition, despite the need for a certain amount of welding allowance, the welding allowance is shortened due to the product height limitation, and it is necessary to purposely perform strength inspection at each spot welding location, which is a great deal of labor for these operations. Will be required.

Even when this method is adopted, it is unavoidable that the mounting height becomes high and the reliability of the caulking portion left exposed to the outside remains uncertain. It was Furthermore, since the life of the welding electrode during spot welding is usually short,
It was unavoidable that another inconvenience such as frequent maintenance and inspection work of the spot welder would occur.

The present invention was devised in view of these inconveniences, and it is possible to improve the mechanical strength of the lead terminal while reducing the cost and labor.
An object of the present invention is to provide an electronic component with a lead terminal that enables easy mounting work using an automatic component insertion machine.

[0010]

In order to achieve such an object, an electronic component with lead terminals according to the present invention has a flat plate portion for supporting a ceramic element housed in a case,
It has a thin metal terminal consisting of a lead portion extending from the flat plate portion and protruding to the outside of the case, and a lead portion protruding to the outside of the case and bent along a direction orthogonal to the protruding direction. It is characterized in that the joining end surface of the lead terminal having a large thickness is butt-welded to the surface of the outer end portion of.

In the method of manufacturing an electronic component with lead terminals according to the present invention, after the ceramic element and the metal terminal are housed in the case, the ceramic element and the metal terminal are projected out of the case and bent along a direction orthogonal to the projecting direction. The joining end surface of the lead terminal is abutted and welded to the surface of the outer end portion of the lead portion of the formed metal terminal.

[0012]

According to the above construction, it is not necessary to perform mechanical processing such as crimping, and the cost and labor can be reduced. Further, since the lead portion and the lead terminal forming the metal terminal are integrally joined by butt welding, the mechanical strength between them is extremely large and electrical continuity is secured.

[0013]

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

FIG. 1 is an assembled sectional view showing a schematic structure of a piezoelectric resonator which is an example of an electronic component with lead terminals according to this embodiment, and FIG. 2 is an exploded perspective view showing a manufacturing method thereof. Since the overall structure of the piezoelectric resonator of this embodiment is basically the same as that of the conventional example, parts and portions which are the same as or correspond to those in FIGS. 3 and 6 are denoted by the same reference numerals in FIGS. , Detailed description is omitted here.

As shown in FIGS. 1 and 2, the piezoelectric resonator according to the present embodiment has a ceramic element 1 that performs a required operation such as area vibration and length vibration, and a case body 2 made of an insulating resin.
The case 2 comprises a case cover 2b and a pair of metal terminals 3 for sandwiching the ceramic element 1 housed in the case 2. In this case, each of the metal terminals 3 supports the ceramic element 1 housed in the case 2 and conducts electricity, and the flat plate portion 4
Case 2 after being extended as a narrow shape from one end of
The metal terminal 3 is composed of a thin lead portion 5 protruding to the outside, that is, into the seal portion 6 provided in the opening of the case 2, and these metal terminals 3 are thin metal plates of about 0.1 mm. After punching and pressing into a hoop shape, the flat plate portion 4 is incorporated into the case 2, and only the hoop portion 3a connected to the outer end portion of the lead portion 5 is cut and removed.

At this time, the outer ends of the respective lead portions 5 projecting outside the case 2 are bent along a direction orthogonal to the direction in which the lead portions 5 themselves project the case 2, and the lead 5 is bent. On the surface of the outer end portion of the lead portion 5 which is made thick, for example, a round bar-shaped lead terminal 8 having a diameter of about 0.5 mm is added and joined by direct butt welding. ing. Butt welding of these two is carried out in the seal portion 6 of the case 2, and since the sealing insulating resin is filled in the seal portion 6, the butt welding of the lead portion 5 and the lead terminal 8 is performed. The part is not exposed to the outside at all. Of course, such a seal portion 6 may not be provided in the case 2.

Furthermore, the butt welding at this time is performed by applying a required current to each of the lead portion 5 (metal terminal 3) and the lead terminal 8 via the hoop portion 3a before removal. It is performed by using the resistance welding method. When such a welding method is adopted, the joining end surfaces of the lead terminals 8 cut into required lengths are welded, so that solder or the like is attached to the outer peripheral surface of the round bar material serving as the lead terminals 8. It does not matter even if the plating layer is formed.

That is, in the method of manufacturing the piezoelectric resonator according to this embodiment, after the ceramic element 1 and the flat plate portion 4 constituting the metal terminal 3 are housed in the case 2, the ceramic element 1 and the flat plate portion 4 are projected outside the case 2. The butt welding of the joint end surface of the lead terminal 8 to the surface of the outer end portion of the lead portion 5 of the metal terminal 3 bent along the direction orthogonal to the protruding direction at The hoop portion 3a connected to the outer end is cut and removed after butt welding. And in this method,
By using the hoop material in a state in which a large number of the metal terminals 2 composed of the flat plate portion 4 and the lead portion 5 are integrally connected to the hoop portion 3a through each lead portion 5,
A large number of piezoelectric resonators can be efficiently manufactured by automatic assembly.

By the way, the lead terminal 8 in the present embodiment.
The cross-sectional shape of is not limited to a circle, and may be any cross-sectional shape such as a square shape or a flat shape with a large thickness.
More than two of these lead terminals 8 may be provided. Further, although not shown, the lead terminal 8 is generally bent for the purpose of imparting a spring property, and the lead terminal 8 in this embodiment is bent. Of course, it may have a shape. In the above description, the electronic component with lead terminals is assumed to be a piezoelectric resonator, but the scope of application of the present invention is not limited to piezoelectric resonators such as ceramic resonators and ceramic filters, The present invention can also be applied to other electronic components with lead terminals such as trimmer capacitors and PTC thermistors.

[0020]

As described above, in the electronic component with lead terminals according to the present invention, the length of the lead portion, which constitutes the metal terminal together with the flat plate portion and protrudes to the outside of the case, becomes shorter. Since the joining end surface of the lead terminal with a thick thickness is butt-welded to the outer end of the bent lead portion, the addition structure of the lead terminal is adopted.
As a result of eliminating the need for processing such as crimping, there is an effect that the cost can be reduced. Further, the mechanical strength of the lead terminal and the lead terminal, which are integrated by butt welding, and the mechanical strength of the lead terminal are both increased, so that the mounting work using the automatic component insertion machine becomes easy.

Further, not only the electrical continuity between the lead portion and the lead terminal can be secured by welding, but also the welding allowance as in the spot welding is not required, resulting in the limitation of the product height. Further, it is possible to obtain the effect that the reliability can be improved while reducing the height when mounted on the wiring board.

[Brief description of drawings]

FIG. 1 is an assembled sectional view showing a schematic structure of a piezoelectric resonator according to an embodiment.

FIG. 2 is an exploded perspective view showing the manufacturing method.

FIG. 3 is an assembled sectional view showing a schematic structure of a piezoelectric resonator according to a conventional example.

FIG. 4 is an exploded perspective view showing the manufacturing method.

FIG. 5 is an assembled sectional view showing a schematic structure of a piezoelectric resonator according to a conventional modification.

FIG. 6 is an assembled sectional view showing a schematic structure of a piezoelectric resonator according to a conventional modification.

[Explanation of symbols]

 1 Ceramic element 2 Case 3 Metal terminal 4 Plate part 5 Lead part 8 Lead terminal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display H03H 3/02 B

Claims (2)

[Claims] 1. A flat plate portion (4) for supporting a ceramic element (1) housed in a case (2), and leads extending from the flat plate portion (4) and protruding to the outside of the case (2). An outer end of the lead part (5) which is provided with a thin metal terminal (3) composed of the part (5) and which is bent to extend outside the case (2) and is bent along a direction orthogonal to the protruding direction. An electronic component with a lead terminal, characterized in that the joint end face of a lead terminal (8) having a large thickness is butt-welded to the surface of the portion. 2. A ceramic element (1) and a metal terminal (3).
After being housed in the case (2), the outer end of the lead portion (5) of the metal terminal (3) is protruded to the outside of the case (2) and bent along a direction orthogonal to the protruding direction. A method of manufacturing an electronic component with a lead terminal, comprising butt-welding the joint end surface of the lead terminal (8) to the surface of the above.