JP2001217148A - Chip-type aluminum electrolytic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chip-type aluminum electrolytic capacitor, which having a superior vibration proofing property where soldered sections are not broken nor lead wires are not fractured by vibrations, when the capacitor is used in a state where the capacitor is mounted on a substrate. SOLUTION: This chip-type aluminum electrolytic capacitor is constituted, in such a way that a wall section 2b which is formed to such a height that the section 2b can cover an annular drawn section 1a provided at the time of sealing the case 1, comes into contact with a metallic case 1, the opened end of which is sealed with a sealing member after a capacitor element is housed in the case 1, and holds the peripheral surface of the case 1 by its internal surface is provided at a place, where the peripheral edge of an insulating terminal assembly 2 fitted to the case 1, crosses at least the bending direction of lead wires. Consequently, the reliability of this electrolytic capacitor is improved, because even when strong vibrations are applied to the capacitor in a state where the capacitor is mounted on the substrate, the capacitor exhibits superior vibration proofing property.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip type aluminum electrolytic capacitor which is used as a surface mount type mounted on a substrate and which requires particularly excellent vibration resistance.

[0002]

2. Description of the Related Art FIG. 14 is a perspective view showing the structure of a conventional chip type aluminum electrolytic capacitor of this type. In FIG. (Not shown), a bottomed cylindrical metal case 11a is a metal case 1
1 is a drawing processing section. Reference numeral 12 denotes an insulating terminal plate mounted so as to contact the sealing member. The insulating terminal plate 12 has a hole (not shown) through which a pair of lead wires 11b led from the capacitor element is inserted. A groove 12a is provided on the outer surface (bottom in the figure) for accommodating a pair of lead wires 11b inserted through the hole by bending the lead wire 11b in a right angle direction and accommodating the lead wire 11b. Met.

[0003]

However, in the conventional chip-type aluminum electrolytic capacitor constructed as described above, after mounting on the board, in particular, as shown in FIG. 15, X is the direction connecting the pair of lead wires 11b. When a strong vibration stress is applied in the Y direction which is a direction perpendicular to the direction, the capacitor and the substrate vibrate so as to swing like a pendulum because bonding to the substrate is performed at only two places of the pair of lead wires 11b. As a result, there is a problem that a soldered portion between the lead wire 11b and the substrate and a root portion of the lead wire 11b are damaged, and in the worst case, the soldered portion is separated or the lead wire 11b is broken.

In order to solve such a problem, the present inventors have proposed in Japanese Patent Application No. 11-286493 that the insulating terminal plate is formed in a housing shape surrounding a capacitor body. In order to improve the vibration resistance, the outer diameter of the product body and the inner diameter of the housing part must be the same or almost the same, which makes it difficult to attach the product body to the housing part. But it was.

As another means for solving the same problem, Japanese Patent Application Laid-Open No. Hei 9-162077 discloses a support having a supporting portion which rises and extends from a peripheral portion of an insulating terminal plate. It has a projection that enters the drawing groove, or the support part is cut by a number of cuts, or the support part is made of a resin material that has a cylindrical shape and has some elasticity integrally with the insulating terminal plate Although techniques such as those are disclosed, even in these cases it is difficult to mount because the support portion is similarly formed in an annular shape, or because the support portion is formed only up to the drawing groove portion of the capacitor, There is a problem that a sufficient effect cannot be obtained for strong vibrations in consideration of mounting on an automobile or the like.

[0006] On the other hand, with the progress of chipping of electrical components, the market is strongly demanding chip-type aluminum electrolytic capacitors having excellent vibration resistance, such as mounting in engine rooms for aluminum electrolytic capacitors. Was what it was.

The present invention solves such a conventional problem,
It is an object of the present invention to provide a chip-type aluminum electrolytic capacitor that can be easily mounted on a product body and has excellent vibration resistance.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention, in particular, houses a capacitor element provided with a lead wire for external drawing out in a metal case. In a chip-type aluminum electrolytic capacitor in which an open end of a metal case is sealed with a sealing member and an insulating terminal plate is mounted so as to abut on the sealing member, at least a bending direction of a lead wire on a peripheral edge of the insulating terminal plate. A structure provided with a wall portion that is formed at a height equal to or higher than the annular drawing portion provided when sealing the metal case at the intersection with the metal case and that abuts so as to hold the peripheral surface of the metal case on the inner surface. With this configuration, even when strong vibration is applied in all directions including the direction intersecting the lead wire bending direction with the product mounted on the board,
A wall portion of the metal case is provided at least in a direction intersecting with the bending direction of the lead wire of the insulated terminal plate and formed to a height not less than a height covering an annular drawn portion provided when sealing the metal case. The function and effect of exhibiting excellent vibration resistance because it is elastically held on the peripheral surface and providing a highly reliable chip type aluminum electrolytic capacitor can be obtained.

[0009] The invention described in claim 2 of the present invention is, in particular,
The insulation terminal board has a rectangular shape, and a wall is provided at the center of each side. With this configuration, excellent resistance to vibrations in any direction with the product mounted on the board in any direction. The effect of being able to provide a chip-type aluminum electrolytic capacitor exhibiting vibration and having high reliability is obtained.

[0010] The invention described in claim 3 of the present invention is, in particular,
The insulating terminal plate has a rectangular shape, and a wall portion is provided at each of the corners. With this configuration, the same operation and effect as the operation and effect according to the second aspect of the invention can be obtained.

[0011] The invention described in claim 4 of the present invention is, in particular,
The insulating terminal plate has a rectangular shape, and has two corners at both ends of one side in the same direction as the bending direction of the lead wire, and a wall provided at the center of the side opposite to the side. According to the configuration, the same operation and effect as the operation and effect according to the second aspect of the invention can be obtained.

The invention described in claim 5 of the present invention particularly provides
The height of the wall portion provided on the anode lead wire side is different from the height of the wall portion provided on the cathode lead wire side. With this configuration, the anode and the cathode can be easily distinguished from the appearance. An effect can be obtained.

The invention according to claim 6 of the present invention particularly provides
According to the present invention, the insulated terminal board has a configuration in which two corners at both ends of one of the anode lead wire side and the cathode lead wire side are chamfered. The same operation and effect as the operation and effect can be obtained.

[0014] The invention described in claim 7 of the present invention particularly provides
In this configuration, a projection that fits into an annular drawing portion provided when sealing the metal case is provided on a wall provided on the insulating terminal plate. By holding the metal case by being stuck in the machined portion, it is possible to obtain a function and effect that a more excellent vibration resistance is exhibited and a more reliable chip-type aluminum electrolytic capacitor can be provided.

[0015] The invention described in claim 8 of the present invention particularly provides
The wall portion having the projection is formed of an elastic metal body, and this configuration increases the holding force of holding the metal case with the wall portion in a state where the projection is stuck in the annular drawing portion. The effect of being able to provide a highly reliable chip-type aluminum electrolytic capacitor that exhibits excellent vibration resistance and that has high reliability is obtained.

The invention according to claim 9 of the present invention particularly provides
The wall provided on the insulated terminal plate is bonded to the peripheral surface of the metal case with an adhesive.
The metal case can be completely held by the wall portion, and the effect of exhibiting more excellent vibration resistance and providing a more reliable chip-type aluminum electrolytic capacitor can be obtained.

According to a tenth aspect of the present invention, an annular holding member is particularly arranged between the metal case and the wall portion. The effect of being able to hold the metal case more firmly and providing a highly reliable chip-type aluminum electrolytic capacitor exhibiting even better vibration resistance is obtained.

The eleventh aspect of the present invention has a configuration in which a plurality of cuts are made at one end of the annular holding member to form a strip. The function and effect of the described invention can be further enhanced, and the function and effect of providing a highly reliable chip-type aluminum electrolytic capacitor can be obtained.

According to a twelfth aspect of the present invention, in particular, a pair of dummy terminals are provided in a direction intersecting a bending direction of a lead wire of an insulating terminal plate.
With this configuration, the dummy terminals can be soldered at the same time when the product is mounted on the board, exhibiting even better vibration resistance and providing a more reliable chip-type aluminum electrolytic capacitor. Is obtained.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) Hereinafter, the first embodiment of the present invention will be described with reference to Embodiment 1.

FIG. 1 is a perspective view showing the structure of a chip type aluminum electrolytic capacitor according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing the same insulated terminal plate, and FIGS. FIG. 4 is a plan view showing another example of the insulating terminal plate, and FIGS.
In the figure, reference numeral 1 designates a capacitor element formed by winding an anode foil and a cathode foil to which an anode lead wire and a cathode lead wire (not shown) are connected, respectively, with a separator interposed therebetween. A cylindrical metal case with a bottom which is housed together with the liquid and whose open end is sealed with a sealing member (not shown), 1a is a drawn portion applied to the metal case 1 at the time of the sealing.

Reference numeral 2 denotes an insulating terminal plate mounted so as to contact the sealing member. The insulating terminal plate 2 has a pair of lead wires (not shown) derived from the capacitor element.
Are provided on the outer surface (the bottom surface in the figure) of a hole 2c through which the hole 2c is inserted and a pair of lead wires inserted through the hole 2c are bent at right angles to accommodate the lead wire. It is configured as possible. The pair of lead wires inserted through the holes 2c of the insulating terminal plate 2 are bent at right angles to be substantially flush with the outer surface of the insulating terminal plate 2 and are housed in the groove 2a. They are soldered as terminals.

The insulating terminal plate 2 is formed in a rectangular shape, and a plurality of wall portions 2b are provided at each corner so as to hold the peripheral surface of the metal case 1 on the inner surface. The height of the portion 2b is formed to be higher than the height enough to cover the drawn portion 1a, and it is desirable that the height is not less than half the height of the metal case 1. Also,
The insulating terminal plate 2 provided with the plurality of walls 2b as described above.
Is to securely hold the peripheral surface of the metal case 1 by integrally forming the insulating resin material so that the dimension between the inner surfaces of the opposed wall portions 2b is slightly smaller than the outer diameter of the metal case 1. Therefore, even if strong vibration is applied in a direction intersecting the bending direction of the lead wire with the product mounted on the board, the wall portion 2b securely holds the metal case 1 and suppresses the occurrence of excessive vibration. Therefore, the present invention can provide a highly reliable chip-type aluminum electrolytic capacitor which exhibits excellent vibration resistance.

The plurality of walls 2b provided on the insulated terminal plate 2 may be arranged in several positions, and typical examples are shown in FIGS. 3 (a) to 3 (d).

FIG. 3A shows that the insulating terminal plate 2 has a rectangular shape.
The wall 2b is provided at the center of each side, and the metal case 1 can be securely held by the four walls 2b, and the lead wire is bent while the product is mounted on the board. Even when strong vibration is applied in all directions including the direction intersecting with the direction, the wall 2b is
Therefore, it is possible to provide a highly reliable chip-type aluminum electrolytic capacitor exhibiting excellent vibration resistance because it is possible to reliably prevent the occurrence of excessive vibration while maintaining high reliability. Reference numeral 2a in the figure denotes a groove provided on the surface opposite to the wall 2b for accommodating the lead wire, and reference numeral 2c denotes a hole for inserting the lead wire.

FIG. 3B shows that the insulating terminal plate 2 is rectangular.
The wall portion 2b is provided at each corner, and not only can the metal case 1 be securely held by the four wall portions 2b, but also the wall portion 2b can be made thicker to increase the strength. Although it is possible to improve the UP, if the thickness is made thicker than necessary, the elasticity of the wall portion 2b decreases when the metal case 1 is mounted, and it becomes difficult to mount the metal case 1. Therefore, as shown in FIG. This problem can be solved by providing the notch 2d on the outer peripheral side of the wall 2b. Reference numeral 2a in the figure denotes a wall portion 2 for storing lead wires.
A groove 2c provided on the surface opposite to b is a hole for inserting a lead wire.

FIG. 3 (c) shows that the insulated terminal plate 2 is square,
Two corners at both ends of one side in the same direction as the bending direction of the lead wire, and a total of 3 at the center of the side opposite to the side.
In this configuration, the wall portion 2b is provided at a location.
The metal case 1 can be securely held by the two wall portions 2b. Reference numeral 2a in the figure denotes a groove provided on the surface opposite to the wall 2b for accommodating the lead wire, and reference numeral 2c denotes a hole for inserting the lead wire.

FIG. 3 (d) shows that the insulated terminal plate 2 is square,
A pair of wall portions 2b are provided on opposite sides in a direction intersecting with the bending direction of the lead wire. Even when strong vibration is applied in a direction intersecting the bending direction of the lead wire with the greatest damage. The metal case 1 can be securely held by the pair of walls 2b. Reference numeral 2a in the figure denotes a groove provided on the surface opposite to the wall 2b for accommodating the lead wire, and reference numeral 2c denotes a hole for inserting the lead wire.

According to the present invention, the insulating terminal plate 2
Since the peripheral surface of the metal case 1 can be reliably held by providing the wall portion 2b on the base member, strong vibrations in a direction intersecting with the bending direction of the lead wire and all other directions in a state where the product is mounted on the substrate. Even if you join, wall 2
b can reliably hold the metal case 1 and suppress the occurrence of excessive vibration, so that it exhibits excellent vibration resistance,
A highly reliable chip type aluminum electrolytic capacitor can be provided.

(Embodiment 2) Hereinafter, the second embodiment of the present invention will be described with reference to Embodiment 2.

FIG. 4 is a perspective view showing a configuration of an insulating terminal plate of a chip type aluminum electrolytic capacitor according to a second embodiment of the present invention. In FIG. 4, reference numeral 3 denotes an insulating terminal plate. A hole 3d through which a pair of lead wires (not shown) led out of the capacitor element is inserted;
a groove 3a for accommodating a pair of lead wires, into which a pair of lead wires d are inserted, in a direction perpendicular thereto, and a plurality of wall portions 3b contacting each corner so as to hold the peripheral surface of the metal case on the inner surface.
3c and a notch 3e on the outer peripheral side of the walls 3b and 3c.
Is provided in the same manner as in the first embodiment.
The wall portions 3b and 3c are provided two by two, and the heights H1 and H2 are different from each other, and how the heights of the wall portions 3b and 3c are different is different. If you decide to arrange either the anode or the cathode of a pair of lead wires on one side, it will be very easy to distinguish the anode and the cathode from the appearance of the assembled chip type aluminum electrolytic capacitor Things.

As described above, according to the present invention, the insulating terminal plate 3
The heights H1 and H2 of the walls 3b and 3c are different from each other, so that the anode and the cathode can be easily distinguished from the appearance of the assembled product. is there. In the first embodiment,
It is needless to say that the same operation and effect as those obtained by the chip type aluminum electrolytic capacitor can be obtained.

(Embodiment 3) Hereinafter, a third embodiment of the present invention will be described with reference to Embodiment 3.

FIG. 5 is a perspective view showing a configuration of an insulating terminal plate of a chip type aluminum electrolytic capacitor according to Embodiment 3 of the present invention, and FIGS. 6 (a) to 6 (d) are plan views thereof. In FIG. 1, reference numeral 4 denotes an insulating terminal plate. The insulating terminal plate 4 has a hole 4c through which a pair of lead wires (not shown) derived from a capacitor element is inserted, and a pair of leads through which the hole 4c is inserted. Grooves 4 for storing wires bent at right angles
a, a plurality of wall portions 4b abutting each corner so as to hold the peripheral surface of the metal case on the inner surface, and a notch 4d provided on the outer peripheral side of the wall portion 4b are provided in the above-described embodiment. Same as in the first embodiment. Further, the insulating terminal plate 4 is formed in a rectangular shape, and has a configuration in which chamfered portions 4e are provided at two corners at both ends of one side in a direction intersecting the groove portion 4a for accommodating a pair of lead wires, If it is determined that one of the anode and the cathode of the pair of lead wires is arranged on the side where the chamfered portion 4e is provided, the anode and the cathode can be separated from the appearance of the assembled chip type aluminum electrolytic capacitor. It will be very easy to identify.

The plurality of walls 4b provided on the insulated terminal plate 4 may be provided in several specifications in the same manner as in the first embodiment, as shown in FIGS. 6 (a) to 6 (d). Here is a typical example. Since the operation and effect of the insulating terminal plate 4 shown in FIGS. 6A to 6D are the same as the operation and effect of the insulating terminal plate according to the first embodiment, detailed description will be omitted.

As described above, according to the present invention, the insulating terminal plate 4
If it is determined that one of the anode and the cathode of a pair of lead wires is arranged on the side where the chamfered portion 4e is provided, the chip-type aluminum electrolytic capacitor which has been assembled is provided. The appearance makes it possible to distinguish the anode and the cathode very easily. It goes without saying that the same function and effect as those obtained by the chip type aluminum electrolytic capacitor according to the first embodiment can be obtained.

In the third embodiment and the second embodiment,
It is needless to say that the effect is further increased by using a combination of the configuration having the different heights of the wall portions of the insulated terminal plate shown in FIG.

(Embodiment 4) Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.

FIG. 7 is a sectional view showing a structure of a chip type aluminum electrolytic capacitor according to a fourth embodiment of the present invention.
2A and 2B are perspective views showing the configuration of the insulated terminal plate. In FIG. 1, reference numeral 1 denotes a metal case of a chip-type aluminum electrolytic capacitor, and 1 a denotes a drawn portion provided on the metal case 1. Reference numeral 1b denotes a lead wire drawn from a capacitor element (not shown) in the metal case 1. Reference numeral 5 denotes an insulated terminal plate. The insulated terminal plate 5 has a pair of lead wires 1b (not shown) connected to a capacitor element.
c), a groove 5a for accommodating a pair of lead wires 1b bent in a right angle direction for accommodating the pair of lead wires 1b inserted in the hole 5c, and a peripheral surface of the metal case 1 held at an inner surface at each corner. As described in the first embodiment, the plurality of wall portions 5b that come into contact with each other and the notch 5d is provided on the outer peripheral side of the wall portion 5b.

Further, a projection 5e is provided on the inner surface of the wall 5b of the insulating terminal plate 5. In FIG. 8A, a partial projection 5e is provided on the inner surface of the wall 5b. (B)
In this embodiment, the projection 5e is provided on the entire inner surface of the wall 5b. The projection 5e fits into the drawn portion 1a of the metal case 1 as shown in FIG. 7, and the wall 5b holds the metal case 1 beyond the projection 5e to near the center of the metal case 1. As a result, not only the contact area with the metal case 1 is increased and higher vibration resistance can be exhibited, but also the metal case 1 is securely held against vertical vibration. Thus, the occurrence of excessive vibration can be suppressed. In addition,
The protrusion 5e may be made of a resin material integrally with the wall 5b of the insulating terminal plate 5, or may be made of an elastic body such as rubber by dividing the protrusion 5e into individual pieces.

As described above, according to the present invention, the insulating terminal plate 5
The structure in which the protrusion 5e is provided on the inner surface of the wall 5b not only increases the contact area with the metal case 1 to exhibit higher vibration resistance, but also reduces vibration in the vertical direction. On the other hand, the occurrence of excessive vibration can be suppressed by securely holding the metal case 1, and the same operation and effect as obtained by the chip-type aluminum electrolytic capacitor according to the first embodiment can be obtained. It can be obtained at a high level.

(Embodiment 5) Hereinafter, a fifth embodiment of the present invention will be described with reference to Embodiment 5.

FIGS. 9A and 9B are perspective views showing the structure of an insulating terminal plate of a chip type aluminum electrolytic capacitor according to a fifth embodiment of the present invention. In FIG. 9, reference numeral 6 denotes an insulating terminal plate. The insulating terminal plate 6 has a hole 6 through which a pair of lead wires (not shown) derived from the capacitor element is inserted.
c, a groove 6a for accommodating a pair of lead wires inserted through the hole 6c in a direction perpendicular thereto and accommodating a plurality of walls at the center of each side so as to hold the peripheral surface of the metal case on the inner surface. The provision of the portion 6b is the same as in the first embodiment.

However, in the fifth embodiment, the wall 6b is made of an elastic metal body and the projection 6d is provided on the inner surface.
Are formed integrally with each other at the time of forming the insulated terminal plate 6, or provided with a concave portion for press-fitting the wall portion 6b into the insulated terminal plate 6, and press-fitted into this concave portion. is there. The wall 6b made of an elastic metal body
May be formed after the insulating terminal plate 6 is mounted on the metal case.

As described above, according to the present invention, the insulating terminal plate 6
Is formed of an elastic metal body, and the projection 6
With the configuration provided with d, the holding force with respect to the metal case 1 is increased, and higher vibration resistance can be exhibited, and generation of excessive vibration including vertical vibration is suppressed. Thus, the same function and effect as obtained by the chip-type aluminum electrolytic capacitor according to the first embodiment can be obtained at a higher level.

In the fifth embodiment, the structure in which the projection 6d is provided on the inner surface of the wall 6b has been described.
It goes without saying that the object of the present invention can be sufficiently achieved even with a configuration without d.

Further, as in the invention according to the ninth aspect of the present invention, the wall portion provided on the insulating terminal plate is joined to the peripheral surface of the metal case with an adhesive, whereby the first to fifth embodiments can be performed. It goes without saying that a higher level of effect can be obtained in each of the above.

(Embodiment 6) Hereinafter, a sixth embodiment of the present invention will be described with reference to FIG.

FIG. 10 is an exploded perspective view showing the structure of a chip-type aluminum electrolytic capacitor according to Embodiment 6 of the present invention. In FIG. 10, reference numeral 1 denotes a metal case of the chip-type aluminum electrolytic capacitor, and 1a denotes this metal case. 1 is a drawing processing unit provided in the apparatus. Reference numeral 7 denotes an insulated terminal plate. The insulated terminal plate 7 has a hole (not shown) through which a pair of lead wires led out of the capacitor element is inserted, similarly to the insulated terminal plate of the first embodiment. A groove 7a for accommodating a pair of lead wires that are inserted in the metal case 1 at right angles, accommodating a plurality of wall portions 7b in contact with each corner so as to hold the peripheral surface of the metal case 1 on the inner surface; The notch 7c is provided on the outer peripheral side of the portion 7b as in the first embodiment.

Reference numeral 8 denotes a holding member formed in an annular shape. The holding member 8 has a lower end having a dimension smaller than the distance between the inner surfaces of the opposing wall portions 7b, and an upper end having a dimension larger than the same dimension. The holding member 8 is provided so that it can be easily mounted.
The inner surface of the wall portion 7b provided on the insulated terminal plate 7 reliably holds the peripheral surface of the metal case 1 over the entire surface, thereby suppressing the occurrence of excessive vibration and exhibiting higher vibration resistance. You can do it. The holding member 8 can be made of resin, metal, or the like, and does not need to be integrally formed in an annular shape as in the sixth embodiment, but has a wedge-like shape disposed only on each wall 7b. May be used.

As described above, according to the present invention, the metal case 1
With the configuration in which the annular holding member 8 is disposed between the metal case 1 and the wall portion 7b, the metal case 1 can be more firmly held via the holding member 8, and further excellent vibration resistance This makes it possible to provide a highly reliable chip type aluminum electrolytic capacitor exhibiting high reliability.

(Embodiment 7) Hereinafter, a seventh embodiment of the present invention will be described with reference to Embodiment 7.

FIG. 11 is a perspective view showing a structure of a holding member of a chip type aluminum electrolytic capacitor according to a seventh embodiment of the present invention. This embodiment is provided on the upper end side of the holding member 8 of the sixth embodiment. The configuration is a strip shape with a plurality of cuts, and the other configuration is the same as that of the sixth embodiment. Therefore, the description of the same portions will be omitted, and only different portions will be described.

In the drawing, reference numeral 9 denotes a holding member formed in an annular shape. The holding member 9 has a lower end having a dimension smaller than the distance between the inner surfaces of the opposing walls, and an upper end having a dimension larger than the same dimension. The taper is provided so as to have dimensions, and a plurality of cuts 9a are formed in the upper end side to form a strip. With such a configuration, the upper end side formed in the shape of a strip expands in the outer peripheral direction and has a larger diameter, so that the holding member 9 can be easily mounted. After the mounting, the upper end side formed in the shape of a strip is insulated. Since the diameter is reduced by being narrowed in the inner circumferential direction by the wall portion provided on the terminal plate, the peripheral surface of the metal case can be securely held on the entire surface, so that the operation and effect of the sixth embodiment can be further improved. It is remarkable and suppresses occurrence of excessive vibration, and can exhibit higher vibration resistance.

As described above, according to the present invention, a plurality of cuts 9a are formed at the upper end side of the annular holding member 9 disposed between the metal case and the wall to form a strip. The metal case can be more firmly held via the holding member 9, and a highly reliable chip-type aluminum electrolytic capacitor can be provided which exhibits more excellent vibration resistance.

(Eighth Embodiment) Hereinafter, an eighth embodiment of the present invention will be described, particularly with reference to the twelfth embodiment.

FIG. 12 is a bottom view showing the structure of a chip-type aluminum electrolytic capacitor according to Embodiment 8 of the present invention. In FIG. 12, reference numeral 10 denotes an insulated terminal plate. Similarly to the insulated terminal plate of the first embodiment, a pair of lead wires 1b led out of the capacitor element
A hole 10c through which the hole 1c is inserted, a groove 10a for accommodating a pair of lead wires 1b, 1c through which the hole 10c is inserted by bending in a right angle direction, and holding a peripheral surface of the metal case at an inner surface at each corner. A plurality of walls 10 that abut against each other
The provision of b is the same as in the first embodiment.

Reference numeral 1d denotes a pair of dummy terminals provided on the bottom surface of the insulated terminal plate 10. The dummy terminal 1d is provided on the periphery of the insulated terminal plate 10 in a direction intersecting the bending direction of the lead wires 1b and 1c. When the chip-type aluminum electrolytic capacitor is mounted on a substrate, the dummy terminal 1d is soldered similarly to the lead wires 1b and 1c. Accordingly, the stability of the insulated terminal plate 10 of the product mounted on the substrate is greatly improved, and thus the occurrence of excessive vibration can be suppressed and higher vibration resistance can be exhibited.

As described above, according to the present invention, the insulating terminal plate 1
By mounting a pair of dummy terminals 1d in a direction intersecting with the bending direction of the lead wire of No. 0, the dummy terminals 1d are soldered in the same manner as the lead wires when the product is mounted on the board, and the insulating terminals are provided. Since the stability of the plate 10 can be greatly improved, it is possible to provide a highly reliable chip-type aluminum electrolytic capacitor which suppresses the generation of excessive vibration and exhibits higher vibration resistance. Things.

(Embodiment 9) As the chip type aluminum electrolytic capacitor according to the present invention, the following one is selected from the above-described Embodiments 1 to 8 as an example, and a sample (φ18 × 16. 5 Lmm) were prepared, and these were mounted on a substrate and subjected to a vibration test.

[Sample] First Embodiment: A wall was provided at the center of each side of the insulated terminal plate [FIG. 3 (a)] First Embodiment: A wall was provided at each corner of the insulated terminal plate [FIG. 3 (b)] Fourth Embodiment A partial projection is added to the above [FIG.
(A)] Fourth Embodiment A whole projection is added to the above [FIG.
(B)] No embodiment ... Addition of the entire projection to the above [No drawing] Embodiment 5 ... The wall portion is made of an elastic metal body with a projection [Fig. 9 (a)] Embodiment 6 ... An annular holding member is disposed between the metal case and the wall [FIG. 10] Conventional product [Test conditions] (in the XYZ directions shown in FIG. 15) Amplitude: 7.5 mm, Vibration acceleration: 30G, Frequency: 5
1000 Hz, cycle: 8 min, 15 cycles each (120 m
in) Changes in appearance (whether or not lead wire breaks occur) due to vibration conditions (in the Y direction shown in FIG. 15) Vibration acceleration: 1 G, frequency: 5 to 1000 Hz, cycle:
The vibration acceleration peak value was measured under the vibration condition of one cycle of 8 min. The results of the test performed as described above are shown in (Table 1).

[0062]

[Table 1]

As described above, all of the chip-type aluminum electrolytic capacitors according to the present invention exhibited stable vibration resistance without any breakage of the lead wire. Also, the measured value of the peak acceleration in the 1G vibration test is less than 1/2 the value of the product of the present invention compared to the conventional product, and in particular, the value obtained when the protrusion fits into the drawn portion is smaller. You can see that it has become.

Next, the first embodiment according to the present invention used in the above-mentioned test ......... Insulated terminal plate provided with a wall at the center of each side [FIG. 3 (a)]. [FIG. 3 (b)]. Ten products each having the dummy terminal shown in Embodiment 8 (FIG. 12) were produced for each product having a wall at each corner of FIG. As in the test, in the Y direction shown in FIG. 15, the vibration acceleration was measured in a test of one cycle of vibration acceleration: 1 G, frequency: 5 to 1000 Hz, cycle: 8 min, and this product was soldered to a substrate. After the mounting, as shown in FIG. 13, the insulating terminal plate 5 attached to the metal case 1 was pressed in the Y direction to measure the breaking strength until the soldered portion was broken. Table 2 shows the results of the test performed as described above.

[0065]

[Table 2]

As is apparent from the above results, the provision of the dummy terminal does not reduce the vibration acceleration, but increases the breaking strength until the soldered portion breaks, thereby increasing the strength of the product due to soldering. And the product is less likely to peel off due to the destruction of the soldered portion due to vibration.

[0067]

As described above, according to the present invention, at least the bending direction of the lead wire of the insulating terminal plate mounted on the metal case in which the capacitor element is housed and whose open end is sealed with the sealing member is intersected. However, a configuration is provided in which a wall portion is formed that is higher than the height covering the annular drawing portion provided when sealing the metal case and is in contact with the metal case so as to hold the peripheral surface of the metal case on the inner surface. Therefore, even if strong vibration is applied in all directions including the direction intersecting the lead wire bending direction with the product mounted on the board,
A wall portion is provided at least in a direction intersecting the bending direction of the lead wire of the insulated terminal plate, and is formed to a height equal to or higher than an annular drawing portion provided when sealing the metal case. The present invention can provide a highly reliable chip-type aluminum electrolytic capacitor that exhibits excellent vibration resistance because it is elastically held on the peripheral surface of the chip.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a chip-type aluminum electrolytic capacitor according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of the insulating terminal plate.

FIGS. 3A to 3D are plan views showing other examples of the insulating terminal plate.

FIG. 4 is a perspective view showing a configuration of an insulating terminal plate according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a configuration of an insulating terminal plate according to a third embodiment of the present invention.

6A to 6D are plan views showing other examples of the insulated terminal plate.

FIG. 7 is a sectional view showing a configuration of a chip-type aluminum electrolytic capacitor according to a fourth embodiment of the present invention.

FIG. 8A is a perspective view showing the configuration of an insulated terminal plate in which a protrusion is partially provided on the inner surface of the wall. FIG. 8B is a perspective view showing the configuration of an insulated terminal plate in which a protrusion is provided on the entire inner surface of the wall. Perspective view

FIGS. 9A and 9B are perspective views showing a configuration of an insulated terminal plate according to a fifth embodiment of the present invention.

FIG. 10 is an exploded perspective view showing a configuration of a chip-type aluminum electrolytic capacitor according to a sixth embodiment of the present invention.

FIG. 11 is a perspective view showing a configuration of a holding member according to a seventh embodiment of the present invention.

FIG. 12 is a bottom view showing a configuration of a chip-type aluminum electrolytic capacitor according to an eighth embodiment of the present invention.

FIG. 13 is a sectional view showing a test method according to a ninth embodiment of the present invention.

FIG. 14 is a perspective view showing the configuration of a conventional chip-type aluminum electrolytic capacitor.

FIG. 15 is a perspective view showing a vibration direction applied to a vibration test of a chip type aluminum electrolytic capacitor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal case 1a Drawing part 1b, 1c Lead wire 1d Dummy terminal 2,3,4,5,6,7,10 Insulated terminal board 2a, 3a, 4a, 5a, 6a, 7a, 10a Groove part 2b, 3b, 3c , 4b, 5b, 7b, 10b Wall 2c, 3d, 4c, 5c, 6c, 10c Hole 2d, 3e, 4d, 5d, 7c Notch 4e Chamfered portion 5e, 6d Projection 6b Wall made of elastic metal body 8, 9 Holding member 9a Notch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Morihiro Fukuda 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Jun Matsunaga 1006 Kadoma Kadoma, Kadoma City Osaka Pref. 72) Inventor Takeshi Oji 1006 Kadoma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Industrial Co., Ltd.

Claims (12)

[Claims] 1. A capacitor element formed by winding an anode foil and a cathode foil to which an anode lead wire and a cathode lead wire for external drawing are respectively connected with a separator interposed therebetween, and a capacitor element formed by winding the anode foil and the cathode foil. And a bottomed cylindrical metal case containing a driving electrolyte, a sealing member having a hole through which the pair of lead wires are inserted, and sealing an open end of the metal case, and being derived from the sealing member. A chip type aluminum comprising an hole through which a pair of lead wires are inserted and an insulated terminal plate which is provided so as to be bent at a right angle to accommodate the lead wire inserted through the hole on an outer surface and is mounted so as to abut the sealing member. In the electrolytic capacitor, at least a part of the periphery of the insulated terminal plate which intersects with the bending direction of the lead wire is provided with an annular diaphragm provided when sealing the metal case. A chip-type aluminum electrolytic capacitor with a wall that is formed at a height higher than the height that covers the metal part and that comes into contact with the metal case so that the peripheral surface of the metal case is held by the inner surface. 2. The chip-type aluminum electrolytic capacitor according to claim 1, wherein the insulated terminal plate is rectangular, and a wall is provided at the center of each side. 3. The chip-type aluminum electrolytic capacitor according to claim 1, wherein the insulated terminal plate has a rectangular shape, and a wall is provided at each of the corners. 4. The insulated terminal board having a rectangular shape, two corners at both ends of one side in the same direction as the direction in which the lead wire is bent, and a wall portion provided at the center of the side opposite to the side. The chip-type aluminum electrolytic capacitor described in 1. 5. The chip-type aluminum electrolytic capacitor according to claim 1, wherein the height of the wall provided on the anode lead wire side is different from the height of the wall provided on the cathode lead wire side. 6. The chip-type aluminum electrolytic capacitor according to claim 1, wherein two corners at both ends of either the anode lead wire side or the cathode lead wire side of the insulating terminal plate are chamfered. 7. The chip-type aluminum electrolytic capacitor according to claim 1, wherein the wall portion provided on the insulated terminal plate is provided with a projection that fits into an annular drawing portion provided when the metal case is sealed. 8. The chip-type aluminum electrolytic capacitor according to claim 7, wherein the wall having the projection is made of an elastic metal body. 9. The chip-type aluminum electrolytic capacitor according to claim 1, wherein a wall provided on the insulating terminal plate is joined to a peripheral surface of the metal case with an adhesive. 10. The chip-type aluminum electrolytic capacitor according to claim 1, wherein an annular holding member is provided between the metal case and the wall. 11. The chip-type aluminum electrolytic capacitor according to claim 10, wherein a plurality of cuts are made at one end of the annular holding member to form a strip. 12. The chip-type aluminum electrolytic capacitor according to claim 1, wherein a pair of dummy terminals is provided on an outer surface of the insulating terminal plate in a direction intersecting a bending direction of the lead wire.