JP4030197B2 - Resin-sealed capacitor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a resin-sealed capacitor in which the capacitor element is housed in a resin case after a terminal fitting is connected to the capacitor element, and a thermosetting resin is filled and cured in the resin case. .
[0002]
[Prior art]
Conventionally, a resin-sealed capacitor is connected to an external terminal 6a formed by press-molding brass, copper, or the like shown in FIG. 6 and plated with tin or tin alloy on the electrode lead-out portion 2a of the capacitor element as shown in FIG. By joining the connecting portion 6b of the terminal fitting 6 composed of 6b at the welding point 3 by welding or the like, housing this in the resin case 4, filling the resin case with the thermosetting resin 5 and curing it. Was formed.
Further, in a resin-sealed capacitor formed by connecting a plurality of capacitor elements in parallel, as shown in FIG. 7, the electrode lead-out portion 2a of the capacitor element is connected in parallel with the tin alloy plated copper plate 7 for connection shown in FIG. It was formed by soldering and further soldering the tin alloy plated copper plate 7 and the connecting portion 6b of the terminal fitting 6 shown in FIG. However, in such a capacitor, as shown in FIG. 5 and FIG. 7, the accuracy of the pitch P between the terminals is deteriorated, the planar deviation d between the terminals is generated, or soldering with separate components is performed. Work was necessary, and a lot of time was spent on the soldering work.
[0003]
[Problems to be solved by the invention]
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, and in particular, improvement in dimensional accuracy between terminals has become important. However, in the conventional capacitor terminal fitting mounting method, when welding the terminal fitting connection portion to the electrode lead portion of the capacitor element, the welding point of the terminal fitting connection portion sinks into the electrode lead portion due to the pressure during welding, The connection part of the terminal fitting is deformed with the weld point of the connection part as a fulcrum, which causes the external terminal of the terminal fitting to warp outward, resulting in variations in pitch accuracy and planar deviation accuracy after joining. It was. In addition, even when a plurality of capacitor elements are connected in parallel, the pitch accuracy between terminals varies, and separate components are required.
[0004]
For the reasons described above, conventionally, a terminal positioning jig and equipment for alignment are required, and the structure of the production equipment becomes complicated. Also, when multiple units are connected in parallel, the number of parts is large and connection work is also required. There was a problem of requiring a lot of time.
[0005]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-mentioned problems, and it has greatly improved the pitch accuracy between terminals of a resin-sealed capacitor and the planar deviation accuracy between terminals, and a plurality of resins connected in parallel. It is an object of the present invention to provide a resin-encapsulated capacitor that can reduce the number of parts of the encapsulated capacitor and can significantly reduce the time required to connect the capacitor element.
[0006]
That is, a pair of metallized films are overlapped and wound, metallized metal is sprayed on both end surfaces, and the terminal fitting 1 is joined to the capacitor element 2 having the electrode lead portion 2a, and the capacitor element is placed in the resin case 4. In the resin-sealed capacitor, which is housed and filled with the thermosetting resin 5 in the resin case and cured, the terminal fitting includes an external terminal 1a and an electrode bent along the upper end from the inner wall of the resin case 4 A connecting portion 1b to the lead portion 2a, and the connecting portion 1b is formed with two or more cutout portions 1f, and the electrode holding portion 1d and the electrode leadout portion 2a between the cutout portions 1f are welded and joined . A support portion 1c for preventing deformation of the external terminal 1a is connected to the electrode holding portion 1d, and a claw portion 1e that fits into an insertion groove 4a provided in the resin case 4 is provided on the support portion 1c. It is characterized by
[0007]
Further, two or more electrode holding portions 1d are provided.
[0008]
Further, the electrode holding portions 1d are provided at regular intervals, and a plurality of capacitor elements 2 are connected in parallel.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
As described above, in the resin-sealed capacitor of the present invention, the connection part of the terminal fitting that contacts the electrode lead part of the capacitor element is composed of the support part and the electrode holding part, and the electrode holding part and the electrode lead part are welded. The support part is not deformed against the sinking of the electrode holding part due to welding, and the support part is positioned in parallel with being in contact with the electrode lead part, thereby improving the pitch accuracy between the terminals. In addition, it is possible to eliminate planar displacement, and even when a plurality of capacitor elements are connected in parallel, they can be attached by an integrated terminal fitting, so that parts can be reduced and work can be rationalized.
[0011]
【Example】
[Example 1]
FIG. 1 is a drawing of an embodiment of the resin-sealed capacitor of the present invention, where (a) is a plan view, (b) is a front sectional view, (c) is a right sectional view, and (d) is a sectional view of (a). It is a partial cross-section enlarged view of an ellipse. 2A and 2B are drawings of one 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.
The terminal fitting 1 is formed by integrally forming a metal plate made of brass, copper, or the like by stamping, 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 part 1d is welded to the electrode lead part 2a of the capacitor element. The support portion 1c is in contact with 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, and the pitch P accuracy between the terminals and the planar displacement are prevented. d Maintain accuracy. The claw portion 1e is formed so as to extend in an L shape from the connection portion 1b. The terminal fitting 1 is constituted by applying tin or tin alloy plating to the surface after punching. The claw portion 1e at the tip of the connecting portion 1b is provided to fit in the insertion groove 4a of the resin case 4 and stably store the capacitor element 2 in the resin case 4, and the pitch accuracy between the terminals In addition, it is possible to improve the planar displacement accuracy.
[0012]
Next, a description will be given of a procedure for producing a resin-sealed capacitor by attaching the terminal fitting to the capacitor element.
A pair of metallized films overlapped and wound, and metal element metal such as zinc or solder is sprayed on both end surfaces to form a capacitor element 2 formed with an electrode lead-out portion 2a, and integrally formed terminal fitting connection portions The electrode holding portion 1d 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 in the claw portion 1e of the terminal fitting connecting portion and the resin case insertion groove 4a. Are fitted and housed, and the thermosetting resin 5 is filled and cured to obtain a resin-sealed capacitor.
[0013]
As described above, according to the above embodiment, the connecting portion of the integrally formed terminal fitting 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 joined by welding. Therefore, during this welding, 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, and the electrode holding part is deformed, but this sinking is caused by the support parts on both sides of the electrode holding part. This prevents deformation of the external terminal due to warpage. In addition, since the claw part of the connection part of the terminal fitting is fitted in the insertion groove of the resin case, the capacitor element is stably stored in the resin case, the pitch accuracy between the terminals is improved, and the planar deviation accuracy It is possible to produce a resin-encapsulated capacitor without any material.
[0014]
[Example 2]
FIG. 3 is a drawing of another embodiment of the resin-sealed capacitor of the present invention, in which (a) is a plan view, (b) is a front sectional view, and (c) is a right sectional view. Moreover, FIG. 4 is drawing of the other Example of a terminal metal fitting, (a) is a top view, (b) is a front view, (c) is a right view.
The terminal fitting 1 is made of the same material and manufacturing method as in the first embodiment. The integrally formed terminal fitting 1 is composed of an external terminal 1a and a connecting portion 1b, and the length of the connecting portion is L. Are divided into a plurality of electrode holding portions 1d, 1d,... Provided at a constant pitch p, and the electrode holding portions 1d, 1d,. It joins to the electrode extraction part 2a of a capacitor | condenser element by the welding point 3 by welding. Since the electrode holding part 1d adjacent to the electrode holding part 1d joined to the support part 1c by welding plays the role of the support part and is in contact with the electrode lead part 2a of the capacitor element, the electrode lead part and the electrode holding part The deformation of the external terminals 1a caused by welding with 1d is prevented, and the pitch P accuracy between the terminals and the planar deviation d accuracy are maintained. The claw portion 1e is formed so as to protrude from the support portion 1c of the connection portion, and is fitted into the insertion groove of the resin case so that the capacitor element is stably accommodated in the resin case. The terminal fitting 1 is constituted by performing tin or tin alloy plating on the surface after punching.
[0015]
A capacitor element similar to that of the first embodiment is manufactured, and a plurality of electrode holding portions 1d, 1d,... Joined to the part 2a at the welding point 3 by welding, the claw part 1e of the connection part of the terminal fitting is fitted and stored in the insertion groove of the resin case, filled and cured with the thermosetting resin 5, and a resin-sealed capacitor Got.
[0016]
As described above, according to the above-described embodiment, the connecting portion of the integrally formed terminal fitting is divided into the supporting portion and the plurality of electrode holding portions provided at a constant pitch, and the electrode holding portions are equally spaced. Since it is welded and joined to the electrode lead parts of a plurality of capacitor elements, the welding point of the electrode holding part sinks into the electrode lead part of the capacitor element due to the welding pressure during this welding. Since the electrode holding part adjacent to the joined electrode holding part serves as a support part and is in contact with the electrode lead part of the capacitor element, deformation of the external terminal caused by welding between the electrode lead part and the electrode holding part is prevented, and The claw part of the connection part of the terminal fitting is fitted in the insertion groove of the resin case, so that the capacitor element can be stably stored in the resin case, and the pitch accuracy between the terminals and the planar deviation accuracy Resin-sealed type con It is possible to fabricate a capacitor.
[0017]
In the above-described embodiment, the length of the connection portion is L, and the support portion and a plurality of electrode holding portions provided at a constant pitch are formed. Although the case where the lead portion is joined by welding is shown, the length of the capacitor body is cut by L ′ in accordance with the size of the capacitor body formed by connecting a plurality of capacitor elements in parallel. By cutting and using the same terminal metal fittings, the number of parts of the terminal metal fittings can be reduced and standardized. Further, the position of the claw portion provided on the integrally formed terminal fitting is not limited to the embodiment of the present invention, and may be a position where it is fitted in the insertion groove provided in the resin case when housed in the resin case.
[0018]
【The invention's effect】
As described above, since the resin-sealed capacitor of the present invention is formed by connecting the support portion and the electrode holding portion to the terminal portion of the integrally formed terminal fitting, the electrode holding portion and the electrode lead portion are welded to each other. Even if the welding point of the holding part sinks into the electrode lead-out part due to welding pressure, the electrode holding part other than the support part or the welded part prevents deformation of the external terminal due to the sinking of the electrode holding part. Therefore, it is possible to greatly improve the pitch accuracy between terminals and the planar deviation accuracy. Also, when connecting multiple capacitor elements in parallel, even if the capacitor body dimensions vary, the length of the connection part By cutting according to the length, the same terminal fitting can be used, and the number of parts can be reduced and standardized. Further, the number of soldering operations can be reduced, and a more stable quality capacitor can be provided, so that the value is extremely large industrially and practically.
[Brief description of the drawings]
FIG. 1 is a drawing of an embodiment of a resin-sealed capacitor according to the present invention, (a) is a plan view, (b) is a front sectional view, (c) is a right sectional view, and (d) is ( It is a fragmentary sectional enlarged view of the ellipse part of a).
FIG. 2 is a drawing of an embodiment of a terminal fitting, wherein (a) is a plan view, (b) is a front view, (c) is a right side view, and (d) is a perspective view from above. .
FIG. 3 is a drawing of another embodiment of the resin-sealed capacitor of the present invention, in which (a) is a plan view, (b) is a front sectional view, and (c) is a right sectional view.
FIG. 4 is a drawing of another embodiment of the terminal fitting, wherein (a) is a plan view, (b) is a front view, and (c) is a right side view.
5A and 5B are drawings of a conventional resin-sealed capacitor, where FIG. 5A is a plan view, FIG. 5B is a front sectional view, and FIG. 5C is a right sectional view.
6A and 6B are drawings of a conventional terminal fitting, where FIG. 6A is a plan view, FIG. 6B is a front view, and FIG. 6C is a right side view.
7A and 7B are drawings of another conventional resin-sealed capacitor, where FIG. 7A is a plan view, FIG. 7B is a front sectional view, and FIG. 7C is a right sectional view.
FIG. 8 is a drawing of a conventional tin alloy plating plate for connection, in which (a) is a plan view and (b) is a front view.
9 is a drawing of a terminal fitting connected to the tin alloy plating plate for connection shown in FIG. 8 of the conventional example, (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]
1 Terminal metal fitting 1a External terminal 1b Connection part 1c Support part 1d Electrode holding part 1e Claw part 1f Notch part 2 Capacitor element 2a Electrode lead part 3 Welding point 4 Resin case 4a Insertion groove 5 Thermosetting resin 6 Terminal metal fitting 6a External terminal 6b Connecting portion 7 Tin alloy plating plate 8 Soldering portion P Pitch between terminals d Plane deviation between terminals L Length of connecting portion of terminal fitting L 'Adjusting and cutting of terminal fitting connecting portion adjusted based on capacitor body dimensions Length p Pitch of electrode holder

Claims (3)

A pair of metallized films are overlapped and wound, and metal terminal metal (1) is joined to a capacitor element (2) formed by thermally spraying metallicon metal on both end faces to form an electrode lead part (2a). In a resin-sealed capacitor that is housed in a case (4) and filled and cured with a thermosetting resin (5) in the resin case,
The terminal fitting includes an external terminal (1a) bent along the upper end from the inner wall of the resin case (4 ) and a connection portion (1b) to the electrode lead-out portion (2a). The connection portion (1b) Are formed with two or more cut-out portions (1f), and the electrode holding portion (1d) and the electrode lead-out portion (2a) between the cut-out portions (1f) are welded and joined to the electrode holding portion (1d). Is a support portion (1c) for preventing deformation of the external terminal (1a),
A resin-sealed capacitor, wherein a claw portion (1e) that fits into an insertion groove (4a) provided in the resin case (4) is provided in the support portion (1c) .   2. The resin-sealed capacitor according to claim 1, wherein two or more electrode holding portions (1d) are provided.   The resin-sealed capacitor according to claim 1 or 2, wherein the electrode holding portions (1d) are provided at regular intervals, and a plurality of capacitor elements (2) are connected in parallel.

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