JP6985680B2 - Surface-mounted capacitors and seat plates used for them - Google Patents

Description

The present invention relates to a surface mount type capacitor and a seat plate used therein.

The seat plate used for the surface-mounted capacitor described in Patent Document 1 is arranged so as to extend vertically from the bottom wall on which the columnar capacitor body is arranged and to surround the outer peripheral surface of the capacitor body. It has four side walls. A contact portion in contact with the outer peripheral surface of the capacitor body is formed on the inner surface of each side wall. Two contact portions are formed on each side wall and extend parallel to the axial direction of the capacitor body from the bottom wall. A surface-mounted (chip type) capacitor is configured by mounting the capacitor body on this seat plate.

Further, in addition to the invention described in Patent Document 1, as the seat plate used for the surface mount type capacitor, those shown in FIGS. 7 and 8 are known. Similar to the one described in Patent Document 1, the seat plate 101 extends vertically from the bottom wall 102 in which the columnar capacitor body (not shown) is arranged and the bottom wall 102, and has a side wall having a constant wall thickness. It has four side walls 103 arranged so as to surround the outer peripheral surface of the capacitor body. The four side walls 103 have an arc-shaped inner peripheral surface along the outer peripheral surface of the capacitor body, and the inner peripheral surface thereof is in surface contact with the outer peripheral surface of the capacitor body. However, when a surface-mounted capacitor is actually mounted on a substrate and vibration is applied, the vibration becomes larger toward the upper side of the capacitor body. Therefore, as shown in FIG. 8, the main point of action of suppressing the vibration of the capacitor body is. It becomes the tip of the side wall 103. On the other hand, the root side (bottom wall 102 side) of the side wall 103 functions as a fulcrum, and when the capacitor body is inserted between the plurality of side walls 103, the holding force F11 of the side wall 103 and the tip of the side wall 103 in contact with the capacitor body are in contact with each other. The force relationship with the force F12 that opens to the outside is important for suppressing the vibration of the capacitor body.

Japanese Unexamined Patent Publication No. 2016-76600

However, in the seat plate 101 of FIG. 8, since the wall thickness of the side wall 103 is constant, it is not possible to sufficiently secure the strength on the root side which is the fulcrum of the side wall 103, and the force at which the tip of the side wall 103 opens outward. The force to suppress F12 is weakened. Further, since the seat plate 101 is made of resin, some elasticity can be expected when the capacitor body is inserted into the side wall 103, but the elasticity of the resin itself deteriorates with the passage of time, and the side wall 103 holds the capacitor body. become unable. From the above, in the conventional seat plate, there is a problem that the side wall cannot stably hold the capacitor body.

Therefore, the present invention has been made to solve the above-mentioned problems, and is a surface mountable type provided with a seat plate capable of stably holding the capacitor main body by a side wall arranged on the outer peripheral surface thereof and the seat plate. It is to provide a capacitor.

The surface-mounted capacitor according to the present invention includes a capacitor main body for accommodating a capacitor element and a seat plate for holding the capacitor main body, and the seat plate includes a bottom wall on which the capacitor main body is arranged and the bottom wall. It has a plurality of side walls extending from the capacitor body in the axial direction and pressing the capacitor body, and the outer surface of the side wall is inclined inward from the bottom wall side toward the tip and from the bottom wall side to the tip. It has an inclined surface formed so as to expand toward it , and the wall thickness of the side wall is continuously increased from the tip toward the bottom wall side.

In the present invention, the outer surface of the side wall is formed so as to be inclined inward from the bottom wall side toward the tip, and the wall thickness of the side wall becomes thicker from the tip toward the bottom wall side. As a result, the strength of the base side (bottom wall side) of the side wall functioning as a fulcrum can be increased, and the holding force of the capacitor body by the side wall is improved. Further, by forming the outer surface of the side wall inclining inward from the bottom wall side toward the tip, the force that the tip of the side wall opens outward is suppressed, and the holding force of the capacitor body at the tip of the side wall is strengthened. .. Further, by making the wall thickness on the bottom wall side thicker than the tip of the side wall, warpage and distortion of the side wall are suppressed, the center of gravity of the side wall is lowered, and vibration resistance is improved. From the above, the side wall of the seat plate arranged on the outer peripheral surface of the capacitor body can stably hold the capacitor body.

In the surface mount type capacitor according to the present invention, it is preferable that the inner side surface of the side wall extends parallel to the axial direction of the capacitor body.

In the present invention, the inner surface of the side wall extends parallel to the axial direction of the capacitor body. As a result, the capacitor body can be held on the entire inner surface of the side wall.

In the surface mount type capacitor according to the present invention, it is preferable that the bottom wall has a rectangular plate shape, the side walls are formed at the corners of the bottom wall, and the inclination angles of the outer surfaces of the side walls facing each other are different from each other.

In the present invention, the inclination angles of the outer surfaces of the facing side walls are different from each other. Thereby, the distances from the central axis of the outer surface upper edges of the plurality of side walls can be made the same.

The seat plate according to the present invention is a seat plate that holds a capacitor body that houses a capacitor element, and extends from the bottom wall on which the capacitor body is arranged and the bottom wall in the axial direction of the capacitor body to the capacitor. It has a plurality of side walls that press the main body, and the plurality of side walls can be elastically deformed in a direction in which they are separated from each other with respect to the central axis of the bottom wall, and the outer surface of the side wall is from the bottom wall side to the tip. It has an inclined surface that is inclined inward and expands from the bottom wall side toward the tip, and the wall thickness of the side wall is continuously thickened from the tip to the bottom wall side. ..

In the present invention, the outer surface of the side wall is formed so as to be inclined inward from the bottom wall side toward the tip, and the wall thickness of the side wall becomes thicker from the tip toward the bottom wall side. As a result, the strength of the root side (bottom wall side) of the side wall functioning as a fulcrum can be increased, and the holding force of the capacitor body by the side wall is improved. Further, by forming the outer surface of the side wall inclining inward from the bottom wall side toward the tip, the force that the tip of the side wall opens outward is suppressed, and the holding force of the capacitor body at the tip of the side wall is strengthened. .. Further, by making the wall thickness on the bottom wall side thicker than the tip of the side wall, warpage and distortion of the side wall are suppressed, the center of gravity of the side wall is lowered, and vibration resistance is improved. From the above, the side wall of the seat plate arranged on the outer peripheral surface of the capacitor body can stably hold the capacitor body.

In the surface-mounted capacitor and seat plate of the present invention, the outer surface of the side wall is formed so as to be inclined inward from the bottom wall side toward the tip, and the wall thickness of the side wall becomes thicker from the tip toward the bottom wall side. ing. As a result, the wall thickness on the bottom wall side becomes thicker than the tip of the side wall, the strength of the base side (bottom wall side) of the side wall that functions as a fulcrum can be increased, and the holding force of the capacitor body by the side wall is improved. Further, by forming the outer surface of the side wall inclining inward from the bottom wall side toward the tip, the force that the tip of the side wall opens outward is suppressed, and the holding force of the capacitor body at the tip of the side wall is strengthened. .. Further, by making the wall thickness on the bottom wall side thicker than the tip of the side wall, warpage and distortion of the side wall are suppressed, the center of gravity of the side wall is lowered, and vibration resistance is improved. From the above, the side wall of the seat plate arranged on the outer peripheral surface of the capacitor body can stably hold the capacitor body.

It is an upper perspective view which shows the capacitor main body and a seat plate which concerns on embodiment of this invention. It is a lower perspective view which shows the capacitor main body and a seat plate which concerns on embodiment of this invention. FIG. 3 is an upward perspective view of the seat plate of FIG. 1 as viewed from different directions. FIG. 3 is a downward perspective view of the seat plate of FIG. 1 as viewed from different directions. It is a top view which shows the seat plate of FIG. FIG. 5 is a sectional view taken along line VI-VI of FIG. It is an upper perspective view which shows the conventional seat plate. It is sectional drawing of the seat plate of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the surface-mounted capacitor 1 according to the present embodiment has a capacitor body 10 having a substantially cylindrical shape and a seat plate 20 for holding the capacitor body 10. The capacitor main body 10 is composed of a wound capacitor element (not shown), a bottomed cylindrical storage container 11 for accommodating the capacitor element, and a sealing material 12 for sealing the open end of the storage container 11. ing. Further, the seat plate 20 is formed along the central axis C of the capacitor body 10 so as to surround the bottom wall 22 in which the two insertion holes 21 are formed and the bottom surface of the capacitor body 10 abuts and the outer peripheral surface of the capacitor body 10. It is composed of four side walls 30 extending from the wall.

The capacitor body 10 having a cylindrical shape accommodates a capacitor element inside a substantially cylindrical storage container 11, and after inserting a sealing material 12 at the open end thereof, a groove 13 is formed near the lower portion of the outer peripheral side surface. By crimping in this way, the accommodating container 11 is sealed by the sealing material 12. The capacitor body 10 is provided with two lead terminals 14 so as to penetrate the sealing material 12. Each lead terminal 14 is connected to a tab (not shown) derived from a capacitor element, for example, by welding.

The condenser element may be formed by winding an anode foil made of a valve metal such as aluminum with a separator interposed therebetween and impregnated with an electrolytic solution, or may be a solid conductive element as an electrolyte. A solid electrolytic capacitor element or the like in which a polymer is formed between an anode foil and a cathode foil made of a valve metal such as aluminum can be used.

The seat plate 20 is made of an electrically insulating material and is manufactured by injection molding. In the present embodiment, the material of the seat plate 20 is resin. As described above, the seat plate 20 is composed of a bottom wall 22 on which the capacitor body 10 is arranged and four side walls 30 (see FIGS. 3 and 4).

The bottom wall 22 has a predetermined wall thickness and, as shown in FIG. 5, has a substantially square shape when viewed from above. The bottom wall 22 is formed with a recess 24 having a contact surface 22a with the capacitor body 10 recessed around the central axis C on the side of the capacitor body 10 facing the sealing material 12. In the state where the seat plate 20 holds the capacitor main body 10, the central axis C of the capacitor main body 10 and the central axis C of the bottom wall 22 (recessed portion 24) coincide with each other.

The two insertion holes 21 formed in the bottom surface 25 of the recess 24 penetrate from the contact surface 22a to the back surface 22b. The two insertion holes 21 are formed near the central portion of the bottom wall 22 when viewed from above. Two lead terminals 14 provided in the capacitor main body 10 are inserted into the two insertion holes 21. On the back surface 22b of the bottom wall 22, two groove portions 29 having a depth substantially equal to the wall thickness of the lead terminal 14 are formed so that the lead terminal 14 can be accommodated from the two insertion holes 21 to the outer end portion. ing. The two groove portions 29 extend radially outward from the central axis C.

As described above, the two lead terminals 14 drawn from the sealing material 12 of the capacitor main body 10 are inserted into the two insertion holes 21 and bent outward along each groove 29. As a result, the bottom wall 22 is sandwiched between the capacitor main body 10 and the bent lead terminal 14, and is integrated with the capacitor main body 10. At this time, in the two lead terminals 14, the portion exposed on the back surface 22b of the bottom wall 22 is housed in the groove portion 29 and does not protrude. Therefore, the surface mount type capacitor 1 can stand on its own.

Returning to FIG. 5, the side walls 30 (30a, 30b) are formed at the corners of the bottom wall 22, respectively. The four side walls 30 are arranged so that the distances from the central axis C of the capacitor body 10 are equal to each other. Further, four side walls 30 are arranged at equal angular intervals in the circumferential direction with respect to the central axis C. The four side walls 30 include two side walls 30a formed in the corners of the flattened bottom wall 22 and two side walls 30b formed in the corners of the rounded bottom wall 22.

The two side walls 30a have the same shape as each other. Each of the two side walls 30a has an inner surface 31 having an arcuate top view and an outer surface 32 including a surface curved and extending around the central axis C. The inner side surface 31 is formed as a first arc surface centered on the central axis C of the capacitor body 10 and is a part of a first circumference having a radius larger than that of the capacitor body 10. As shown in FIG. 6, the inner side surface 31 extends from the bottom wall 22 toward the capacitor body 10 side (upper side) in parallel with the central axis C. When the seat plate 20 holds the capacitor body 10, the entire inner surface 31 of each side wall 30a presses the outer peripheral surface of the capacitor body 10.

When the outer side surface 32 is viewed from above, the lower edge 32a of the outer surface 32 is formed in a straight line because the corners of the bottom wall 22 are flattened. The upper edge 32b of the outer side surface 32 is formed as a part of a second circumference that is concentric with the first circumference and has a radius larger than the first circumference. The outer side surface 32 is inclined from its lower edge 32a to its upper edge 32b. When viewed from the side, the outer surface 32 extends from the bottom wall 22 toward the capacitor body 10 (upper side) at an angle θ1 inward in the radial direction of the bottom wall 22. In other words, the outer surface 32 is formed on an inclined surface inclined inward from the root (lower edge 32a) of the side wall 30a toward the tip (upper edge 32b), whereby the wall thickness of the side wall 30a increases from the tip toward the root. It's getting thicker.

The two side walls 30b have the same shape as each other. Each of the two side walls 30b has an inner side surface 31 having an arcuate top view and an outer surface 33 curved around the central axis C. Since the inner side surface 31 has the same shape as the inner side surface 31 of the side wall 30a, the same reference numerals are given and the description thereof will be omitted.

When the outer side surface 33 is viewed from above, the lower edge 33a of the outer surface 33 is formed in a curved shape due to the rounded corners of the bottom wall 22. The distance L2 between the midpoint B of the lower edge 33a and the central axis C is longer than the distance L1 between the midpoint A of the lower edge 32a of the outer surface 32 and the central axis C. Like the upper edge 32b of the outer surface 32, the upper edge 33b of the outer side surface 33 is formed as a part of the second circumference which is concentric with the first circumference and has a radius larger than the first circumference. The outer side surface 33 is inclined from its lower edge 33a to its upper edge 33b. When viewed from the side, the outer surface 33 extends from the bottom wall 22 toward the capacitor body 10 (upper side) at an angle θ2 inward in the radial direction of the bottom wall 22. In other words, the outer surface 33 is formed on an inclined surface that is inclined inward from the root (lower edge 33a) of the side wall 30b toward the tip (upper edge 33b), whereby the wall thickness of the side wall 30b is increased from the tip to the bottom wall 22 side. It is getting thicker toward. The inclination angles of the outer surface 32 of the side wall 30a and the outer surface 33 of the side wall 30b facing the side wall 30a are different from each other. That is, the tilt angle θ2 is larger than the tilt angle θ1. Further, since the distance L2 from the central axis C is longer than L1, the wall thickness of the side wall 30b is formed to be thicker than the wall thickness of the side wall 30a.

In order to hold the capacitor body 10 on the seat plate 20, the capacitor body 10 is further pushed downward from the state shown in FIG. At this time, the side wall 30 made of resin is elastically deformed outward along the outer peripheral surface of the capacitor body 10 by being pushed outward in the radial direction by the capacitor body 10.

When the seat plate 20 holds the capacitor body 10, the capacitor body 10 is pressed by the inner side surfaces 31 of the four side walls 30 in the direction toward the central axis C thereof. As a result, the capacitor body 10 is firmly sandwiched by the seat plate 20.

Further, since the side wall 30 made of resin can be elastically deformed in the direction of contact with the capacitor body 10, even if the outer shape of the capacitor body 10 and / or the side wall 30 is distorted, the amount of deformation is less than a predetermined range. Even if it is deformed, the side wall 30 follows the deformation and elastically deforms in both the inner and outer directions in the radial direction. Therefore, in the present embodiment, it is guaranteed that the inner side surface 31 of each side wall 30 comes into contact with the outer peripheral surface of the capacitor body 10.

[Characteristics of the surface-mounted capacitor 1 of this embodiment]
The surface-mounted capacitor 1 of the present embodiment has the following features.

In the surface-mounted capacitor 1 and the seat plate 20 of the present embodiment, the outer surfaces 32 and 33 of the side wall 30 are formed so as to be inclined inward from the root side (bottom wall 22 side) of the side wall 30 toward the tip, and the side walls are formed. The wall thickness of 30 increases from the tip toward the bottom wall 22 side. As a result, the strength of the root side (bottom wall 22 side) serving as a fulcrum of the side wall 30 that presses the capacitor body 10 can be increased, and the holding force of the capacitor body 10 by the side wall 30 can be improved. Further, by forming the outer surfaces 32 and 33 of the side wall 30 so as to incline inward from the bottom wall 22 side toward the tip, the force that the tip of the side wall 30 opens outward is suppressed, and the capacitor main body at the tip of the side wall 30 is suppressed. The holding power of 10 is strengthened. Further, by making the wall thickness on the bottom wall 22 side thicker than the tip of the side wall 30, the warp and distortion of the side wall 30 are suppressed, the center of gravity of the side wall 30 is lowered, and the vibration resistance is improved. From the above, the side wall 30 of the seat plate 20 can stably hold the capacitor body 10.

In the surface-mounted capacitor 1 of the present embodiment, the inner side surface 31 of the side wall 30 extends parallel to the axial direction of the capacitor body 10. As a result, the capacitor body 10 can be held by the entire inner side surface 31 of the side wall 30.

In the surface mount type capacitor 1 of the present embodiment, the inclination angles of the inclined surfaces (outer surfaces 32, 33) of the facing side walls 30a and 30b are different from each other. Thereby, the distances from the central axis of the outer surface upper edges of the plurality of side walls 30 can be made the same.

Although the embodiments of the present invention have been described above with reference to the drawings, it should be considered that the specific configuration is not limited to these embodiments. The scope of the present invention is shown not only by the description of the above-described embodiment but also by the scope of claims, and further includes all modifications within the meaning and scope equivalent to the scope of claims.

In the above embodiment, the positions of the lower edges 32a and 33a of the side walls 30a and 30b in the height direction (width direction) are set to the contact surface 22a of the bottom wall 22, but the position is not limited to this and is higher than the contact surface 22a. It may be in a high position or a low position. The positions of the lower edges 32a and 33a in the height direction can be changed as long as the side walls 30a and 30b are on the root side (bottom wall 22 side) and the effects of the present invention are exhibited.

In the above embodiment, the inner side surface 31 of the side wall 30 extends parallel to the central axis C of the capacitor body 10. However, as long as the inner side surface 31 presses and holds the outer peripheral surface of the capacitor body 10, the present invention is not limited to this.

In the above embodiment, the inclination angle of the outer surface 32 of the side wall 30a and the outer surface 33 of the side wall 30b facing the side wall 30a with respect to the bottom wall 22 is different. However, the present invention is not limited to this, and the same effect can be obtained even if the inclination angle of the outer surface 32 and the outer surface 33 is the same.

In the above embodiment, four side walls 30 are provided, but the number of side walls 30 is not particularly limited.

1-side mount type capacitor 10 Capacitor body 20 Seat plate 22 Bottom wall 30 (30a, 30b) Side wall 31 Inner side surface 32 Outer side surface 33 Outer side surface C Central axis

Claims (4)

A capacitor body for accommodating a capacitor element and a seat plate for holding the capacitor body are provided.
The seat plate has a bottom wall on which the capacitor body is arranged, and a plurality of side walls extending from the bottom wall in the axial direction of the capacitor body and pressing the capacitor body.
The outer surface of the side wall has an inclined surface formed so as to incline inward from the bottom wall side toward the tip and expand from the bottom wall side toward the tip .
A surface-mounted capacitor characterized in that the wall thickness of the side wall is continuously increased from the tip toward the bottom wall side. The surface-mounted capacitor according to claim 1, wherein the inner surface of the side wall extends in parallel with the axial direction of the capacitor body. The bottom wall has a rectangular plate shape, and the side wall is formed in a corner of the bottom wall.
The surface-mounted capacitor according to claim 1 or 2, wherein the inclination angles of the outer surfaces of the side walls facing each other are different from each other. A seat plate that holds the capacitor body that houses the capacitor element.
It has a bottom wall on which the capacitor body is arranged, and a plurality of side walls extending from the bottom wall in the axial direction of the capacitor body and pressing the capacitor body.
The plurality of side walls can be elastically deformed in a direction in which they are separated from each other with respect to the central axis of the bottom wall.
The outer surface of the side wall has an inclined surface formed so as to incline inward from the bottom wall side toward the tip and expand from the bottom wall side toward the tip .
A seat plate characterized in that the wall thickness of the side wall is continuously increased from the tip toward the bottom wall side.

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