JP2600906Y2 - Capacitor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor in which a lead terminal is fixed to metallikon portions on both end surfaces of an element, and more particularly to a capacitor having an improved lead terminal.

[0002]

2. Description of the Related Art Conventionally, as a capacitor, a dielectric sheet such as a plastic film or insulating paper and a metal sheet are superposed and wound or laminated, or a metal layer is formed on a surface of a metal-deposited plastic film or the like. There is a type of capacitor in which an element is formed by winding or laminating a dielectric sheet provided with the above. In this type of capacitor, a metallikon portion is formed on both end surfaces of the element formed as described above, and a lead terminal is fixed to the metallikon portion by soldering or spot welding, and then housed in a resin case. . In addition, as a plastic film used for the element, for example, a polypropylene film, a polyester film, or the like is used.

[0005] FIG. 5 is a diagram showing the lead-out terminals and metallikon portions of the elements of such a type of capacitor.
(B) and (B) are side views showing an element having two types of lead-out terminals having different shapes, which is conventionally generally used. The lead terminals 1 shown in FIGS. 5A and 5B are each composed of a terminal body 2 and a connection part 3, and the connection part 3 of the lead terminal 1 in FIG. 2, the connecting portion 3 of the lead-out terminal 1 shown in FIG.
Has a flat plate shape slightly narrower than the terminal body 2. The element 4 is a wound element formed by winding a metal-deposited plastic film, and has a metallikon portion 5 on both end surfaces. With respect to the metallicon part 5 of such an element 4, each lead terminal 1 has a connection part 3 overlapping the metallicon part 5 and a terminal body part 2 projecting from the metallicon part 5. The main body 2 is arranged so as to protrude from the element 4. In this state, the lead terminal 1 is fixed to the metallikon part 5 at the connection part 3 by soldering or spot welding. Reference numeral 6 in the drawing indicates such a fixed portion by soldering or spot welding.

[0004]

However, as shown in FIGS. 5A and 5B, the connecting terminal 3 is connected to the lead terminal 1 as shown in FIGS.
However, there is a disadvantage that the mechanical strength and electrical strength of the fixing portion 6 between the metal and the metallikon portion 5 cannot be sufficiently secured. That is,
First, in the lead terminal 1 shown in FIG. 5A, since the shape of the connecting portion 3 is a single wire, the fixing portion 6 of the connecting portion 3 and the metallikon portion 5 is soldered or spot-welded. , About 1 or 2 pieces, the mechanical strength and electrical strength of the fixing portion 6 cannot be sufficiently secured.

On the other hand, in the lead terminal 1 shown in FIG. 5B, since the shape of the connecting portion 3 is a flat plate shape, when the connecting portion 3 is fixed by spot welding,
Since the connecting portion 3 hardly bites into the metallikon portion 5, the mechanical strength and the electrical strength of the fixing portion 6 cannot be sufficiently secured. Also, in the case of fixing by soldering, although the number of the fixing portions 6 can be slightly increased as compared with the single wire shape, since the outer shape of the connection portion 3 is simple, it is necessary to secure a large number of fixing portions 6. Therefore, the mechanical strength and electrical strength of the fixing portion 6 cannot be sufficiently secured.

Further, in the lead-out terminal 1 shown in FIG. 5A, since the shape of the connection portion 3 is a single line, when soldering or spot welding is performed at a plurality of locations, these connection portions 3 are formed. The fixing portion 6 utilizing heat such as soldering or spot welding is concentrated in a narrow range, and as a result, heat energy is concentrated. Therefore, when the dielectric sheet forming the element 4 is a plastic film, the concentrated plastic film may thermally shrink the plastic film as the dielectric forming the element 4 due to concentrated thermal energy. As described above, when the plastic film constituting the element 4 is thermally contracted, the metallicon portion 5 and the metal layer of the element 4 are separated, and deterioration of electrical characteristics such as an increase in contact resistance and an increase in tan δ is prevented. Invited,
This will impair the function as a capacitor.

In response to such a problem, Japanese Utility Model Application Laid-Open No.
Japanese Patent No. 6227 discloses an improved lead terminal as shown in FIG. As shown in FIG. 6, the connecting portion 3 of the lead terminal 1 is branched into a plurality of (three in the figure) band-shaped projections 3a to 3c. In such a lead-out terminal 1, since the shape of the connection portion 3 is a double-line shape, the fixing portion 6 is formed by soldering or spot welding.
5A can be increased as compared with the lead terminal 1 having the single-line connection portion 3 shown in FIG. 5A and the lead terminal 1 having the flat-plate connection portion 3 shown in FIG. Mechanical strength and electrical strength can be sufficiently secured. When the connecting portion 3 is fixed by spot welding,
Since the end portions of a to 3c are free ends, the belt-shaped projections 3a to 3c can be sufficiently digged into the metallikon portion 5, so that the mechanical strength and electric strength of the fixing portion 6 can be sufficiently improved. Can be secured.

Further, in the lead-out terminal 1 shown in FIG. 6, since the shape of the connection portion 3 is a double-line shape, when soldering or spot welding is performed at a plurality of locations, compared to the single-line shape. Since the fixing portion 6 utilizing heat such as soldering or spot welding is dispersed in a relatively wide range, heat energy is dispersed. Therefore, even when the dielectric sheet of the element 4 is a plastic film, the plastic film thermally shrinks,
Since the metallicon portion 5 and the metal layer of the element 4 do not peel off, the electrical characteristics of the capacitor can be maintained.

However, in the lead-out terminal 1 shown in FIG. 6, since the connecting portion 3 has a double-line shape, the above advantages can be obtained. However, after the parts of the lead-out terminal 1 are processed, tin plating or solder plating is performed. At the time of performing, there is a possibility that a plurality of draw-out terminals 1 are entangled by the free ends of the plurality of band-shaped projections 3a to 3c of the connection portion 3 and plating may be performed in such an entangled state.

The present invention has been proposed to solve the above-mentioned problems of the prior art.
It is possible to sufficiently secure the current strength and mechanical strength of the fixing portion between the lead terminal and the metallikon portion, and to prevent the concentration of heat energy at the time of fixing the lead terminal and maintain the electrical characteristics. An object of the present invention is to provide a highly reliable capacitor including a lead terminal configured to prevent a plurality of lead terminals from being entangled during plating of the lead terminal.
Another object of the present invention is to provide a capacitor having an extraction terminal that can be applied to any of a soldering method and a spot welding method as a method of fixing the extraction terminal and the metallikon portion.

[0011]

According to the present invention, a dielectric sheet and a metal sheet are superposed and wound or laminated, or a dielectric sheet having a metal layer on its surface is wound or laminated. A metallicon portion formed on both end surfaces of the device, a lead terminal fixed to the metallikon portion, and a case for housing the element, wherein the lead terminal is continuously formed. A capacitor having an arranged terminal body portion and a connection portion, the terminal body portion being fixed to the metallikon portion by the connection portion in such a manner that the terminal body portion protrudes from the element. It has features.

That is, in the capacitor according to the present invention, the connection portion of the lead terminal has one or more band-shaped protrusions protruding from the terminal body and a U-shaped outer frame surrounding the entire band-shaped protrusion. In addition, both ends of the outer frame are connected to the terminal body, and the tip of the band-shaped projection is a free end separated from the inner peripheral surface of the outer frame.

[0013]

In the present invention having the above configuration,
The following operation is obtained. That is, since the connecting portion of the lead terminal has a complicated shape having a band-shaped projection and a U-shaped outer frame, the fixing portion formed by soldering or spot welding is replaced with a single-wire connecting portion or a flat connecting portion. In the case where the connecting portion is fixed by spot welding, the band-shaped projection can be sufficiently digged into the metallikon portion. Therefore, the mechanical strength and electrical strength of the fixing portion can be sufficiently ensured.

Further, since the connecting portion of the lead terminal has a complicated shape having a band-shaped projection and a U-shaped outer frame, when soldering or spot welding is performed at a plurality of locations, only a single wire shape is required. Compared to the case of the simple shape described above, the fixing portion utilizing heat such as soldering or spot welding is dispersed in a relatively wide range, so that heat energy is dispersed. Therefore, even when the dielectric sheet of the element is a plastic film, the electrical characteristics of the capacitor can be maintained.

In particular, according to the present invention, since the connecting portion of the lead-out terminal has a shape in which the strip-shaped projection is surrounded by a U-shaped outer frame, tin plating or solder plating is performed after processing the part of the lead-out terminal. In addition, since the plurality of lead terminals are not entangled by the connection portion, plating can be performed satisfactorily.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a capacitor according to the present invention will be specifically described below with reference to FIGS. Here, FIG. 1 is a perspective view showing elements of the capacitor, and FIG. 2 is a cross-sectional view showing a state where the elements are housed in a case.

First, as shown in FIG. 1, a lead terminal 1 according to the present embodiment is composed of a terminal body 2 and a connecting portion 3. The terminal body 2 has a flat plate shape, and the width of the distal end is narrow. The connecting portion 3 includes one band-shaped protrusion 11 protruding from the terminal main body 2 and the band-shaped protrusion 1.
1 and a U-shaped outer frame 12 surrounding the U. More specifically, the outer frame 12 includes legs 12 a and 12 b arranged on both sides of the band-shaped projection 11 in parallel with the band-shaped projection 11.
A connecting portion 12c for connecting between the terminal body 2 of the legs 12a and 12b and the distal end on the opposite side;
a and 12b are provided on the terminal body 2 side.
Is linked to And the tip of the strip-shaped projection 11
It is a free end separated from the inner peripheral surface of the outer frame 12. In this case, from a different viewpoint, the connecting portion 3 of the lead terminal 1 has three branches (the strip-shaped protrusion 11 and the legs 12a, 12a of the outer frame 12).
b) and branches on both sides thereof (legs 12a, 12a).
It can be said that the tip of b) is connected by the connecting portion 12c.

On the other hand, the element 4 is a wound type element formed by winding a metal-deposited plastic film, and has a metallikon portion 5 on both end faces. Such an element 4
Each of the lead-out terminals 1 has a connection portion 3 overlapping the metallicon portion 5 and a terminal body portion 2 protruding from the metallicon portion 5, so that the terminal body portion 2 It is arranged so as to protrude from the element 4. In this state, the extraction terminal 1 is connected to the connection portion 3
And is fixed to the metallikon part 5 by soldering or spot welding. Reference numeral 6 in the drawing indicates such a fixed portion by soldering or spot welding. The element 4 connected to the lead terminal 1 as described above is housed in a resin case 7 and covered with a casting resin 8 such as an epoxy resin, as shown in FIG.

The operation of the present embodiment having the above configuration is as follows. That is, the connecting portion 3 of the lead terminal 1
Is a complicated shape having a band-shaped projection 11 and a U-shaped outer frame 12, so that the number of the fixing portions 6 by soldering or spot welding is changed to a single line shown in FIGS. 5A and 5B. It can be increased as compared with the connection part 3 having a shape or the connection part 3 having a flat plate shape. In this case, specifically, the number of the fixing portions 6 of the lead-out terminal 1 in FIGS. 5A and 5B is two, whereas the number of the fixing portions 6 of the present embodiment is three. Individual.
Therefore, the mechanical strength and electrical strength of the fixing portion 6 can be sufficiently ensured as compared with the case where the extraction terminal 1 shown in FIGS. 5A and 5B is used. When the connecting portion 3 is fixed by spot welding, since the end of the strip-shaped projection 11 is a free end, the strip-shaped projection 11 can be sufficiently digged into the metallikon portion 5. The mechanical strength and electrical strength of the portion 6 can be sufficiently ensured.

Further, since the connecting portion 3 of the lead-out terminal 1 has a complicated shape having a strip-shaped projection 11 and a U-shaped outer frame 12, when soldering or spot welding is performed at a plurality of locations. Since the fixing portion 6 utilizing heat such as soldering or spot welding is dispersed in a relatively wide range as compared with the connection portion 3 having a simple shape of only a single line shown in FIG. Are distributed.
Therefore, even when the dielectric sheet of the element is a plastic film, the plastic film does not thermally shrink, and the metallicon portion 5 and the metal layer of the element 4 do not peel off, so that the electrical characteristics of the capacitor can be maintained. .

In particular, the double-line connecting portion 3 shown in FIG.
In contrast to the entanglement due to the plurality of free ends, in the present embodiment, the connecting portion 3 of the lead terminal 1 has a shape in which the free end of the strip-shaped projection 11 is surrounded by the U-shaped outer frame 12. When tin plating or solder plating is performed after component processing of the lead terminal 1, the plurality of lead terminals 1
Will not be entangled. Therefore, plating can be performed well.

The present invention is not limited to the above embodiment, and the shape of the lead-out terminal can be changed as appropriate. For example, the number of the strip-shaped projections 11 of the connecting portion 3 can be changed as appropriate. FIG. 3 shows an embodiment in which three strip-shaped projections 11a to 11c are provided on the connection part 3 of the lead terminal 1. As described above, when the number of the band-shaped protrusions 11a to 11c is increased, the number of the fixing portions 6 can be increased by that amount, so that the mechanical strength and the electrical strength can be further improved. When the connecting portion 3 is fixed by spot welding, the end portions of the three band-shaped projections 11a to 11c are free ends. Since the fixing portion 6 can be sufficiently engaged, the mechanical strength and the electric strength of the fixing portion 6 can be sufficiently ensured.

On the other hand, the present invention can also be applied to a case in which a common lead terminal 1 is provided for a plurality of elements 4 in a type of capacitor in which a plurality of elements 4 are housed in one case. FIG. 4 is a diagram showing an embodiment in such a case, in which a common lead terminal 1 having three strip-shaped projections 11a to 11c is connected to three elements 4a to 4c. As described above, when the common lead terminal 1 is connected to the plurality of elements 4a to 4c, the configuration of the entire capacitor can be simplified. In this case, the connection between each of the elements 4a to 4c and the lead-out terminal 1 is made by connecting each of the elements 4a to 4c.
4c corresponding to individual band-shaped projections 11a to 11c and outer frame 1
2 can be performed. Therefore, since a large number of fixing portions 6 can be secured for each of the elements 4a to 4c, the mechanical strength and electrical strength of the fixing portion 6 can be sufficiently secured. As a modified example of this embodiment, an embodiment in which a plurality of band-shaped projections are provided for each of the elements 4a to 4c is also possible.

Further, in the above embodiment, the element formed by winding a metal-deposited plastic film was used. However, the specific structure of the element used in the present invention can be appropriately selected. It is also possible to use an element formed by overlapping and winding or laminating a metal sheet and a sheet, and further, instead of using a plastic film as a dielectric sheet, other dielectric sheets such as insulating paper Can be used.

[0025]

As described above, according to the present invention, the connecting portion of the lead-out terminal to the metallicon portion is formed into a shape having a band-shaped projection and a U-shaped outer frame surrounding the entire band-shaped projection. By making the tip of the projection a free end separated from the inner peripheral surface of the outer frame, sufficient current strength and mechanical strength can be ensured at the fixing part between the lead terminal and the metallikon part, and the lead terminal is fixed. It is possible to prevent the concentration of heat energy at the time and maintain the electrical characteristics, and to provide a highly reliable extraction terminal with a configuration in which multiple extraction terminals are not entangled when plating the extraction terminal. Capacitors can be provided.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a capacitor according to the present invention;
In particular, a perspective view showing an element in a state where a lead terminal is connected.

FIG. 2 is a sectional view showing a state in which the device of FIG. 1 is housed in a case.

FIG. 3 is a plan view showing a lead terminal used in another embodiment of the capacitor according to the present invention.

FIG. 4 is a side view showing an embodiment in which the present invention is applied to a capacitor of a type in which a plurality of elements are housed in one case.

FIG. 5 is a side view showing an element having two types of extraction terminals of different shapes, showing an extraction terminal and a metallikon portion of an element of a conventional capacitor.

FIG. 6 is a side view showing a lead terminal and a metallicon section of another conventional capacitor element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lead-out terminal 2 ... Terminal body part 3 ... Connection part 3a-3c, 11, 11a-11c ... Stripe-like projection 4, 4a-4c ... Element 5 ... Metallicon part 6 ... Fixing part 7 ... Resin case 8 ... Casting resin 12 ... Outer frames 12a, 12b ... Legs 12c ... Connecting parts

Claims (1)

(57) [Scope of request for utility model registration] An element formed by superposing and winding or laminating a dielectric sheet and a metal sheet, or by winding or laminating a dielectric sheet having a metal layer on its surface,
Metallicon portions formed on both end faces of the element, a lead terminal fixed to the metallicon portion, and a case for housing the element, wherein the lead terminal is connected to a terminal body portion which is continuously arranged. And a capacitor fixed to the metallikon portion by a connection portion in a form in which the terminal body portion protrudes from the element, wherein the connection portion of the lead terminal is singly or protruding from the terminal body portion. It has a plurality of band-shaped protrusions and a U-shaped outer frame surrounding the entire band-shaped protrusion, and both ends of the outer frame are connected to the terminal main body, and a tip end of the band-shaped protrusion is formed of the outer frame. A capacitor having a free end separated from an inner peripheral surface.