JP2000058380A - Resin-sealed type capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a pitch accuracy between terminals of a capacitor and a planar deviation accuracy between the terminals. SOLUTION: This resin-sealed capacitor, where a pair of metallized films are overlaid each other and wound to form a cylinder, sprayed metallikon metal is ejected at both end faces of the cylinder to form electrode leads 2a and to complete a capacitor element 2, terminal fittings 1 are jointed to the capacitor element 2, the element is housed in a resin case 4, the case is filled with a thermosetting resin 5 and then set, characterized in that the terminal fittings 1 consist of external terminal 1a and a connection part 1b to the electrode lead 2a, the connection part 1b is formed with two or more notches 1f, and an electrode holder 1d between the notches 1f is welded and jointed to the electrode lead 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin sealing type obtained by connecting a terminal fitting to a capacitor element, storing the capacitor element in a resin case, filling the resin case with a thermosetting resin, and curing. The present invention relates to improvement of a capacitor.

[0002]

2. Description of the Related Art Conventionally, a resin-sealed capacitor has an electrode lead-out portion 2a of a capacitor element as shown in FIG. 5 formed by press-forming brass or copper as shown in FIG. 6 and plating the surface with tin or a tin alloy. The connecting portion 6b of the terminal fitting 6 composed of the terminal 6a and the connecting portion 6b is joined at a welding point 3 by welding or the like, stored in a resin case 4, and filled with the thermosetting resin 5 in the resin case. , And was formed by curing. In a resin-sealed capacitor formed by connecting a plurality of capacitor elements in parallel, as shown in FIG.
The electrode lead portion 2a of the capacitor element is soldered in parallel with a tin alloy plated copper plate 7 for connection shown in FIG. 8, and further, the tin alloy plated copper plate 7 and a connection portion 6b of the terminal fitting 6 shown in FIG. It was formed by doing. However, in such a capacitor, as shown in FIGS. 5 and 7, the accuracy of the pitch P between the terminals is deteriorated, a planar deviation d between the terminals is generated, and the soldering of separate components is performed. Work was required, and a lot of time was spent on the soldering work.

[0003]

On the other hand, in order to mount a capacitor on a substrate, a semiconductor module, or the like, dimensional accuracy of each part of the capacitor is required. In particular, it is important to improve dimensional accuracy between terminals. . However, in the conventional method of mounting the terminal fitting of the capacitor, when welding the connection part of the terminal fitting to the electrode lead-out part of the capacitor element, the welding point of the connection part of the terminal fitting sinks into the electrode lead-out part due to welding pressure. The connection part of the terminal fitting is deformed with the welding point of the connection part as a fulcrum, whereby the external terminal of the terminal fitting is warped outward,
The pitch accuracy and the planar deviation accuracy between the terminals after joining varied. In addition, even when a plurality of capacitor elements are connected in parallel, variations in pitch accuracy between terminals occur, and separate components are required.

[0004] For the above reasons, conventionally, a jig for positioning the terminals and equipment for aligning the terminals are required, which complicates the structure of the production equipment.
There is also a problem that the number of parts is large and a lot of time is required for connection work.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has greatly improved the pitch accuracy between terminals of a resin-sealed capacitor and the accuracy of planar displacement between terminals. It is another object of the present invention to provide a resin-sealed capacitor capable of reducing the number of components of a plurality of resin-sealed capacitors connected in parallel and greatly shortening the time required for connection to a capacitor element.

More specifically, a terminal fitting 1 is joined to a capacitor element 2 in which a pair of metallized films are superposed and wound, and a metallicon metal is sprayed on both end faces to form electrode lead-out portions 2a. 4 inside,
In the resin-sealed capacitor obtained by filling and curing the thermosetting resin 5 in the resin case, the terminal fittings are composed of the external terminal 1a and the connecting portion 1b to the electrode lead portion 2a. It is characterized in that two or more notches 1f are formed, and the electrode holding portion 1d and the electrode lead portion 2a between the notches 1f are welded to each other.

[0007] The present invention is characterized in that two or more electrode holding portions 1d are provided.

Further, the present invention is characterized in that the electrode holding portions 1d are provided at regular intervals, and a plurality of capacitor elements 2 are connected in parallel.

Further, the present invention is characterized in that a claw portion 1e fitted in the insertion groove 4a provided in the resin case is provided on the terminal fitting.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, in the resin-sealed capacitor of the present invention, a connection portion of a terminal fitting contacting an electrode lead-out portion of a capacitor element comprises a support portion and an electrode holding portion,
The support portion is not deformed in response to sinking of the electrode holding portion during welding by welding the electrode holding portion and the electrode lead portion, and the support portion is positioned in parallel in a state in contact with the electrode lead portion. As a result, the pitch accuracy between the terminals is improved, and a planar displacement can be prevented. In addition, even when a plurality of capacitor elements are connected in parallel, they can be mounted by the terminal fittings having an integrated structure. Work can be streamlined.

[0011]

[Embodiment 1] FIG. 1 is a drawing of an embodiment of a resin-sealed capacitor according to the present invention, in which (a) is a plan view and (b).
Is a front sectional view, (c) is a right side sectional view, and (d) is a partial cross-sectional enlarged view of the elliptical portion of (a). 2A and 2B are drawings of an embodiment of a terminal fitting, wherein FIG. 2A is a plan view, FIG.
(C) is a right side view, and (d) is a perspective view from above.
The terminal fitting 1 is formed by integrally forming a metal plate made of brass, copper, or the like by a punching process, and includes an external terminal 1a and a connection portion 1b, and the connection portion includes a support portion 1c and an electrode holding portion 1d. The electrode holding portion 1d is welded to the electrode lead portion 2a of the capacitor element. The support portion 1c abuts on the electrode lead portion 2a of the capacitor element to prevent deformation of the external terminal 1a caused by welding between the electrode lead portion and the electrode holding portion 1d. d
Maintain accuracy. The claw portion 1e is formed to extend from the connection portion 1b into an L shape. The terminal fitting 1 is formed by applying tin or tin alloy plating to the surface after punching. The claw 1e at the tip of the connecting portion 1b is provided for fitting the insertion groove 4a of the resin case 4 to stably store the capacitor element 2 in the resin case 4, and has a pitch accuracy between terminals. In addition, it is possible to improve the accuracy of planar displacement.

Next, a description will be given of a procedure for manufacturing a resin-sealed capacitor by attaching the terminal fitting to the capacitor element. A pair of metallized films are stacked and wound,
A metal element such as zinc or solder is sprayed on both end surfaces to form an electrode lead-out portion 2a to form a capacitor element 2, and an electrode holding portion 1d of a connection portion of an integrally molded terminal fitting is formed.
And the electrode lead portion 2a of the capacitor element are joined by welding at a welding point 3, and the capacitor element is inserted into the resin case 4 with the claw portion 1e of the connecting portion of the terminal fitting and the insertion groove 4 of the resin case.
a is fitted and stored, and the thermosetting resin 5 is filled and cured to obtain a resin-sealed capacitor.

As described above, according to the above-described embodiment, the connecting portion of the integrally molded terminal is divided into the supporting portion and the electrode holding portion, and the electrode holding portion and the electrode lead portion of the capacitor element are welded. Because it is joined, the welding point of the electrode holding part sinks into the electrode lead-out part of the capacitor element due to the pressure during welding during this welding, and the electrode holding part is deformed, but the support parts on both sides of the electrode holding part, Deformation such as warpage of the external terminal due to the sink is prevented. Also, since the claw of the connection part of the terminal fitting is fitted in the insertion groove of the resin case,
The capacitor element is stably housed in the resin case, the pitch accuracy between the terminals is improved, and a resin-sealed capacitor without planar displacement accuracy can be manufactured.

Embodiment 2 FIG. 3 is a drawing of another embodiment of the resin-sealed capacitor of the present invention, wherein FIG.
(B) is a front sectional view, and (c) is a right sectional view. Also,
4A and 4B are drawings of another embodiment of the terminal fitting, wherein FIG. 4A is a plan view, FIG. 4B is a front view, and FIG. 4C is a right side view. The terminal fitting 1 is manufactured by the same material and manufacturing method as in the first embodiment. The integrally formed terminal fitting 1 includes an external terminal 1a and a connecting portion 1b, and the length of the connecting portion is L. A plurality of electrode holding portions 1 provided at a constant pitch p with the support portion 1c
, 1d,..., and the electrode holder 1d,
1d are joined at equal intervals to the electrode lead-out portions 2a of the plurality of capacitor elements at welding points 3. Since the electrode holding portion 1d adjacent to the electrode holding portion 1d joined to the support portion 1c by welding plays the role of the support portion and is in contact with the electrode lead-out portion 2a of the capacitor element, the electrode lead-out portion and the electrode holding portion are formed. 1d prevents deformation of the external terminal 1a caused by welding with the terminal 1d.
Accuracy is maintained. The claw portion 1e is a supporting portion 1c of the connecting portion.
It is formed in a more protruding state, fits into the insertion groove of the resin case, and allows the capacitor element to be stably housed in the resin case. The terminal fitting 1 is formed by performing tin or tin alloy plating on the surface after punching.

A capacitor element similar to that of the first embodiment is manufactured, and a plurality of capacitor elements 1d, 1d,... To the electrode lead-out part 2a by welding at the welding point 3, the claw part 1e of the connection part of the terminal fitting is fitted into the insertion groove of the resin case, stored, filled with the thermosetting resin 5 and cured. A sealed capacitor was obtained.

As described above, according to the above-described embodiment, the connection portion of the integrally formed terminal fitting is divided into a support portion and a plurality of electrode holding portions provided at a constant pitch, and the electrode holding portion is formed. Since the electrodes are welded to the electrode lead-out portions of a plurality of capacitor elements at intervals, the welding point of the electrode holding part sinks into the electrode lead-out part of the capacitor element due to the pressure during welding during this welding. The electrode holding part next to the electrode holding part welded to the electrode part serves as a support part and is in contact with the electrode lead part of the capacitor element, preventing deformation of external terminals caused by welding between the electrode lead part and the electrode holding part In addition, since the claw portion of the connection portion of the terminal fitting is fitted in the insertion groove of the resin case, the capacitor element can be stably stored in the resin case, and the pitch accuracy between the terminals and planarity can be improved. Tree without deviation accuracy It can be manufactured sealing capacitor.

In the above embodiment, the length of the connecting portion is L, and the supporting portion is formed of a plurality of electrode holding portions provided at a constant pitch. Although the case where the electrodes were joined to the electrode lead-out portions by welding was shown, the length of the capacitor element was cut into L 'according to the dimensions of the capacitor element body formed by connecting a plurality of capacitor elements in parallel. By cutting and using the same terminal fittings even when the body dimensions change, the number of parts of the terminal fittings can be reduced and standardized. Further, the position of the claw portion provided on the integrally molded terminal fitting is not limited to the embodiment of the present invention, but may be any position as long as it is fitted in the insertion groove provided in the resin case when housed in the resin case.

[0018]

As described above, in the resin-sealed capacitor of the present invention, since the connection portion of the integrally molded terminal is formed by the support portion and the electrode holding portion, the electrode holding portion and the electrode lead-out portion are not formed. During welding, even if the welding point of the electrode holding part sinks and deforms in the electrode lead-out part due to welding pressure, the electrode holding part other than the support part or the welded part warps the external terminal due to the sinking of this electrode holding part. Since the deformation of the capacitor element can be prevented, the pitch accuracy between the terminals and the accuracy of the planar deviation can be greatly improved. The same terminal fitting can be used by cutting according to the length of the connection portion, and the number of parts can be reduced and standardized. Further, the value of the method is extremely large in industrial and practical applications, for example, the number of steps for soldering can be reduced, and a capacitor of more stable quality can be provided.

[Brief description of the drawings]

FIG. 1 is a drawing of one embodiment of a resin-sealed capacitor of the present invention, wherein (a) is a plan view, (b) is a front sectional view,
(C) is a right cross-sectional view, and (d) is a partial cross-sectional enlarged view of the elliptical part of (a).

2A and 2B are drawings of an embodiment of a terminal fitting, wherein FIG. 2A is a plan view, FIG. 2B is a front view, FIG. 2C is a right side view, and FIG. 2D is a perspective view from above. .

3 is a drawing of another embodiment of the resin-sealed capacitor of the present invention, wherein FIG. 3 (a) is a plan view, FIG. 3 (b) is a front sectional view,
(C) is a right sectional view.

FIG. 4 is a drawing of another embodiment of the terminal fitting, and FIG.
Is a plan view, (b) is a front view, and (c) is a right side view.

FIG. 5 is a drawing of a conventional resin-sealed capacitor, in which (a) is a plan view, (b) is a front sectional view, and (c) is a right sectional view.

FIGS. 6A and 6B are drawings of a conventional terminal fitting, wherein FIG. 6A is a plan view, FIG. 6B is a front view, and FIG. 6C is a right side view.

FIG. 7 is a drawing of another conventional resin-sealed capacitor, in which (a) is a plan view, (b) is a front sectional view, and (c) is a right sectional view.

FIGS. 8A and 8B are drawings of a tin alloy plated plate for connection according to a conventional example, wherein FIG. 8A is a plan view and FIG. 8B is a front view.

9 is a drawing of a terminal fitting connected to the tin alloy plated plate for connection of FIG. 8 of the conventional example, where (a) is a plan view, (b) is a front view, and (c) is a right side view. (D) is a perspective view from above.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Terminal fitting 1a External terminal 1b Connection part 1c Support part 1d Electrode holding part 1e Claw part 1f Cutout part 2 Capacitor element 2a Electrode lead-out part 3 Welding point 4 Resin case 4a Insertion groove 5 Thermosetting resin 6 Terminal fitting 6a External terminal 6b Connection part 7 Tin alloy plating plate 8 Solder part P Pitch between terminals d Plane deviation between terminals L Length of connection part of terminal fitting L 'Adjustment of the dimensions of capacitor body and cutting of connection part of terminal fitting Length p Pitch of electrode holder

Claims (4)

[Claims] A pair of metallized films are superposed and wound, and metallicon metal is sprayed on both end surfaces to form an electrode lead-out portion (2).
a) a terminal fitting (1) on the capacitor element (2) formed with a)
And the capacitor element is housed in a resin case (4), and the resin case is filled with a thermosetting resin (5).
In the cured resin-sealed capacitor, the terminal fitting comprises an external terminal (1a) and a connection part (1b) to an electrode lead-out part (2a), and the connection part (1b) has two or more notches. A resin-sealed capacitor in which a portion (1f) is formed and an electrode holding portion (1d) between the notch portion (1f) and an electrode lead-out portion (2a) are welded. 2. The resin-sealed capacitor according to claim 1, wherein two or more electrode holding portions (1d) are provided. 3. The resin-sealed capacitor according to claim 1, wherein said electrode holding portions (1d) are provided at regular intervals, and a plurality of capacitor elements (2) are connected in parallel. 4. The resin-sealed capacitor according to claim 1, wherein a claw portion (1e) fitted into an insertion groove (4a) provided in the resin case is provided on the terminal fitting. .