JP6472970B2 - Surface mount capacitor and seat plate used therefor - Google Patents

Description

  The present invention relates to a surface mount capacitor and a seat plate used for the same.

  The seat plate used for the surface mount type capacitor described in Patent Document 1 is disposed so as to surround the outer peripheral surface of the capacitor body while extending vertically from the bottom wall on which the cylindrical capacitor body is disposed, and the bottom wall. And 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. Three contact portions are formed on each side wall, and extend from the bottom wall in parallel to the axial direction of the capacitor body. By mounting the capacitor body on the seat plate, a surface mount type (chip type) capacitor is configured.

  In addition to the invention described in Patent Document 1, as shown in FIGS. 8A and 8B, seat plates used for surface mount capacitors are known. Similar to the one described in Patent Document 1, the seat plate 103 extends vertically from the bottom wall 104 on which the cylindrical capacitor body 102 is disposed, and surrounds the outer peripheral surface of the capacitor body 102. And two side walls 105 disposed on the side. The two side walls 105 have an arc-shaped inner peripheral surface along the outer peripheral surface of the capacitor main body 102, and the inner peripheral surfaces are in surface contact with the outer peripheral surface of the capacitor main body 102.

Design Registration No. 13619114

  In the surface-mounted capacitor 101 described in Patent Document 1, three contact portions are formed on each side wall as described above. Here, for example, when deformation such as distortion occurs in the side wall of the seat plate during the manufacturing process, the proportion of the three contact portions that are in contact with the capacitor body and those that do not come in contact increases. The same thing may occur when the outer shape of the capacitor body is deformed. More specifically, for example, in one side wall, only two of the three contact portions are in contact with the capacitor body, and in one side wall, only one of the three contact portions is in contact with the capacitor body. . As a result, the balance of holding the capacitor main body by the side wall is lost, and as a result, there is a possibility that sufficient strength against vibration cannot be obtained.

  8A and 8B, the inner peripheral surface of the sidewall 105 is in surface contact with the outer peripheral surface of the capacitor main body 102. However, when the deformation described above occurs in the outer shape of the side wall 105 or the capacitor main body, the inner peripheral surface thereof does not come into surface contact but makes point or line contact at several places. As a result, the balance of holding is lost.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a surface mount capacitor in which a capacitor main body is stably held by a seat plate and a seat plate used therefor.

The surface mount type capacitor of the present invention is a surface mount type capacitor comprising a cylindrical capacitor body and a seat plate for holding the capacitor body, wherein the seat plate includes the capacitor body and the capacitor. A plurality of side walls extending in the axial direction of the capacitor body from the bottom wall; and a plurality of side walls extending from the bottom wall in the axial direction of the capacitor body. The side walls can be elastically deformed in a direction to be separated from and in contact with the capacitor main body, and each side wall has a contact portion that elastically presses the outer peripheral surface of the capacitor main body at different positions in the circumferential direction. two possess closest point to the center axis of the capacitor body at the inner surface, the two insertion holes in the bottom wall, a first virtual plane containing the central axis of the capacitor body The plurality of contact portions are arranged so as to be provided at least four each across the first virtual plane, and are parallel to the direction in which the two insertion holes are arranged on the bottom wall. An angle formed between two contact portions adjacent to each other along the circumferential direction arranged across a second virtual plane including the center axis of the capacitor body perpendicular to the direction and the center axis of the capacitor body is the other It is characterized by being smaller than an angle formed by any two contact portions adjacent along the circumferential direction and the central axis of the capacitor .
In another aspect, the surface-mounted capacitor of the present invention is a surface-mounted capacitor including a cylindrical capacitor body and a seat plate that holds the capacitor body, and the seat plate includes the capacitor body. A bottom wall provided with two insertion holes through which two terminals that are arranged and drawn out from the capacitor body are respectively inserted, and a plurality of side walls extending in the axial direction of the capacitor body from the bottom wall. The plurality of side walls can be elastically deformed in a direction to be separated from and in contact with the capacitor main body, and each side wall elastically presses the outer peripheral surface of the capacitor main body at different positions in the circumferential direction. At the location closest to the central axis of the capacitor body on the inner surface of each side wall, and the two insertion holes are formed on the bottom wall of the central axis of the capacitor body. The plurality of contact portions are arranged so as to be provided at least six each across the first virtual plane, and the two insertion holes are arranged in the bottom wall. The two contact portions adjacent to each other along the circumferential direction, which are arranged across a second imaginary plane including the center axis of the capacitor body and perpendicular to one direction parallel to the first direction, and the center axis of the capacitor body. The angle is the same as the angle formed by the two contact portions adjacent to each other along the circumferential direction arranged across the first virtual plane and the central axis of the capacitor, and along the other circumferential directions. The angle between any two adjacent contact portions and the central axis of the capacitor is smaller.

  In the present invention, the plurality of side walls respectively have contact portions that press the outer peripheral surface of the capacitor main body at different positions in the circumferential direction, and the total number of contact portions is four or more in total. Therefore, it can hold | maintain so that the outer peripheral surface of a capacitor | condenser main body may be surrounded by the contact part formed in the side wall.

  Here, as described above, the capacitor main body and the seat plate may be deformed. In the present invention, there are two contact portions formed on each side wall, and each side wall can be elastically deformed in the direction of separating from and contacting the capacitor body, so even if such deformation occurs, The situation where the contact portion does not come into contact with the outer peripheral surface of the capacitor body is prevented. Accordingly, the balance of holding the capacitor body by the side wall is not lost, and the capacitor body is stably held by the seat plate, so that sufficient strength against vibration and impact can be obtained. On the other hand, when the number of contact portions formed on each side wall is three or more, even when each side wall is elastically deformable in the direction of separating from and contacting the capacitor body, the above-described deformation occurs. When this occurs, the contact portion does not come into contact with the outer peripheral surface of the capacitor body at a higher rate. In addition, when the number of contact portions formed on each side wall is one, the number of contact points that contact each side wall is too small, so that the capacitor body cannot be held in a stable state, or each When the circumferential width and thickness of the capacitor body on the side wall are small, the strength is low and there is a risk of damage.

In addition, since the plurality of contact portions elastically press the outer peripheral surface of the capacitor body at different positions in the circumferential direction, the holding power of the capacitor body is improved, and vibration resistance and impact resistance are further improved. .
The two insertion holes are arranged on the bottom wall so as to be aligned on the first virtual plane including the central axis of the capacitor body, and the plurality of contact portions are provided at least four each across the first virtual plane. Are arranged as follows. Therefore, vibration in one direction (X direction) included in the first virtual plane and orthogonal to the axial direction of the capacitor body and in the direction orthogonal to both the axial direction of the capacitor body (Y direction) is applied to the surface mount capacitor. In this case, since the amplitude of the capacitor body in the Y direction can be kept small, the vibration resistance against the Y direction vibration is improved.
Furthermore, since the amplitude of the capacitor body in the Y direction can be further reduced by the two adjacent contact portions arranged with the second virtual plane in between, the vibration resistance against the Y direction vibration is further improved.

Before SL plurality of contact portions may be arranged in line symmetry with respect to the third imaginary plane including the central axis of the capacitor body.

This ensures that it is possible to enhance the balance of retention of the capacitor body by the side wall.

Before SL plurality of contact portions, and characterized in that before Symbol of two of the contact portions arranged in a direction contact element pairs are arranged to be provided by at least two sides of the said first imaginary plane To do.

Thereby, since vibration can be effectively suppressed by at least two contact portion pairs, vibration resistance against Y-direction vibration can be further improved.

Before SL contact portion is characterized in that the said circumferential direction are provided at both ends of the side walls.

This ensures that it is possible to evenly distribute the impact applied to the side walls.

Before SL plurality of side walls, the inner portion of the upper end and is characterized in that it is chamfered.

Thereby, when attaching the capacitor body, the capacitor body is inserted while being guided by the inclined surface formed by chamfering. Thereby, a capacitor | condenser main body can be attached smoothly.

Each contact portion extends along the axial direction.

Thereby, the contact part and the outer peripheral surface of the capacitor body are in contact with each other over a wide range in the axial direction of the capacitor body. Therefore, for example, the balance of holding of the capacitor body can be further improved as compared with a case where the contact portion and the outer peripheral surface of the capacitor body are in point contact.

Before SL plurality of side walls is characterized in that by pressing the capacitor body in the areas away from the bottom wall than the center position of the axis direction of the side wall.

Thereby, the capacitor body is held higher by the plurality of side walls. Thereby, the holding power of the capacitor body is improved, and the vibration resistance and the impact resistance are further improved.

The seat plate of the present invention is a seat plate for holding a cylindrical capacitor main body , and the two through holes through which the capacitor main body is disposed and two terminals drawn out from the capacitor main body are respectively inserted. A bottom wall provided and a plurality of side walls extending from the bottom wall so as to be orthogonal to the bottom wall, and the plurality of side walls are elastically deformed in a direction away from and in contact with a central axis of the bottom wall. When the capacitor main body is held, contact portions that elastically press the outer peripheral surface of the capacitor main body at positions different from each other in the circumferential direction are held on each side wall of the capacitor main body on the inner side surface of each side wall. two are formed in the nearest point to the center axis, the two insertion holes in the bottom wall, is arranged so as to be aligned on a first imaginary plane including the central axis of said capacitor body, said plurality of contact portions The second imaginary plane is arranged so as to be provided at least four across the first imaginary plane, and is perpendicular to a direction parallel to the direction in which the two insertion holes are arranged on the bottom wall and includes a central axis of the capacitor body. An angle formed by two contact portions adjacent to each other along the circumferential direction arranged across a virtual plane and the central axis of the capacitor main body is any two contact portions adjacent to each other along the circumferential direction. It is smaller than the angle formed by the central axis of the capacitor .
In another aspect, the seat plate of the present invention is a seat plate for holding a cylindrical capacitor body, wherein the capacitor body is disposed, and two terminals drawn from the capacitor body are respectively inserted. A bottom wall provided with two insertion holes, and a plurality of side walls extending from the bottom wall so as to be orthogonal to the bottom wall, the plurality of side walls being separated from a central axis of the bottom wall. A contact portion that is elastically deformable in a contact direction and elastically presses the outer peripheral surface of the capacitor main body at different positions in the circumferential direction when the capacitor main body is held is an inner surface of each side wall. Are formed at a location closest to the center axis of the capacitor body, and the two insertion holes are arranged on the bottom wall so as to be aligned on a first virtual plane including the center axis of the capacitor body, The plurality of contact portions are arranged so as to be provided at least six each across the first virtual plane, and are orthogonal to one direction parallel to the direction in which the two insertion holes are arranged on the bottom wall, and the capacitor body An angle formed between two contact portions adjacent to each other along the circumferential direction and the central axis of the capacitor main body, which are arranged across the second virtual plane including the central axis of the capacitor, and the first virtual plane is arranged. Further, the angle formed by the two contact portions adjacent along the circumferential direction and the central axis of the capacitor is the same, and any two other contact portions adjacent along the circumferential direction and the capacitor It is smaller than an angle formed by the central axis.

In the present invention, similarly to the invention related to the surface mount type capacitor , there are two contact portions formed on each side wall, and each side wall can be elastically deformed in a direction in which it is separated from and in contact with the capacitor body. Therefore, even if deformation occurs, a situation in which the contact portion does not come into contact with the outer peripheral surface of the capacitor body hardly occurs. Thereby, the balance of the holding of the capacitor body by the side wall is not lost, and the capacitor body is stably held by the seat plate, so that a sufficient strength against vibration and impact can be obtained.

In addition, since the plurality of contact portions elastically press the outer peripheral surface of the capacitor body at different positions in the circumferential direction, the holding power of the capacitor body is improved, and vibration resistance and impact resistance are further improved. .
The two insertion holes are arranged on the bottom wall so as to be aligned on the first virtual plane including the central axis of the capacitor body, and the plurality of contact portions are provided at least four each across the first virtual plane. Are arranged as follows. Therefore, vibration in one direction (X direction) included in the first virtual plane and orthogonal to the axial direction of the capacitor body and in the direction orthogonal to both the axial direction of the capacitor body (Y direction) is applied to the surface mount capacitor. In this case, since the amplitude of the capacitor body in the Y direction can be kept small, the vibration resistance against the Y direction vibration is improved.
Furthermore, since the amplitude of the capacitor body in the Y direction can be further reduced by the two adjacent contact portions arranged with the second virtual plane in between, the vibration resistance against the Y direction vibration is further improved.

1 is a perspective view of a surface mount capacitor according to a first embodiment of the present invention. FIG. 2 is a top view of the surface mount capacitor shown in FIG. 1. FIG. 2 is an exploded perspective view of the surface mount capacitor shown in FIG. 1. FIG. 2 is a cross-sectional view showing the shape change of the seat plate before and after holding the capacitor body in the surface mount type capacitor shown in FIG. 1. It is a top view which shows the modification of a side wall. (A) is a perspective view of the surface mount capacitor according to the second embodiment of the present invention, and (b) is a top view of (a). (A) is a perspective view of the surface mount type capacitor according to the third embodiment of the present invention, and (b) is a top view of (a). (A) is a perspective view of the surface-mounted capacitor | condenser which concerns on a prior art example, (b) is a top view of (a).

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the surface mount capacitor 1 according to the present embodiment includes a capacitor body 2 having a substantially cylindrical shape and a seat plate 3 that holds the capacitor body 2. The capacitor body 2 includes a capacitor element (not shown), an outer case 2b that houses the capacitor element, and a sealing member (not shown) that seals the opening of the outer case 2b. Further, the seat plate 3 is formed with two insertion holes 4a (see FIG. 2) and the bottom wall 4 with which the bottom surface of the capacitor body 2 abuts and the axis of the capacitor body 2 so as to surround the outer peripheral surface of the capacitor body 2. It consists of four side walls 5 extending in the direction.

  In the present embodiment, as shown in FIGS. 1 and 2, the axial direction of the capacitor body 2 is the Z direction, and the arrangement direction of the two insertion holes 4a in the bottom wall 4 of the seat plate 3 is the X direction. The direction perpendicular to the direction in which the holes 4a are arranged and the axial direction of the capacitor body 2 is defined as the Y direction, and the following description will be given using these directions as appropriate. Further, as shown in FIG. 1, a plane that is parallel to the X direction and includes the central axis C of the capacitor body 2 (which coincides with a virtual straight line that passes through the center of the bottom wall 4 and is orthogonal to the bottom wall 4). A plane that is parallel to the XZ virtual plane 20 and the Y direction and includes the central axis C of the capacitor body 2 is referred to as a YZ virtual plane 21.

  As shown in FIG. 3, the capacitor body 2 having a substantially columnar shape has a capacitor element housed in a substantially cylindrical outer case 2b, and a sealing member is inserted into the open end of the capacitor body 2 and then the outer peripheral side surface. The sealing member is locked to the outer case 2b by caulking so that the groove 2c is formed in the vicinity of the lower part of the outer casing 2b. The capacitor body 2 is provided with two lead terminals 2a so as to penetrate the sealing member. Each lead terminal 2a is connected to a tab (not shown) derived from the capacitor element by welding, for example.

  Capacitor elements may be formed by winding a separator foil between an anode foil and a cathode foil made of a valve metal such as aluminum and wound, and impregnated with an electrolytic solution, or as a solid conductive 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 3 is made of a material having electrical insulation. In the present embodiment, the material of the seat plate 3 is resin. As described above, the seat plate 3 includes the bottom wall 4 and the four side walls 5.

  The bottom wall 4 has a predetermined thickness and, as shown in FIG. 2, has a substantially square shape when viewed from above. The two insertion holes 4 a formed in the bottom wall 4 penetrate from the contact surface 4 c with the capacitor body 2 to the back surface 4 d. The two insertion holes 4a are formed near the center of the bottom wall 4 when viewed from above. Two lead terminals 2a provided in the capacitor body 2 are inserted through the two insertion holes 4a. The back surface 4d of the bottom wall 4 (surface opposite to the contact surface 4c) is approximately equal to the thickness of the lead terminal 2a so that the lead terminal 2a can be accommodated from the two insertion holes 4a to the outer end. Two grooves 4b having a depth are formed. The two groove portions 4b are formed so that their length directions are parallel to the X direction.

  As described above, the two lead terminals 2a drawn from the sealing member 2d of the capacitor body 2 are inserted into the two insertion holes 4a, and are bent outward along the grooves 4b. Thus, the bottom wall 4 is sandwiched between the capacitor body 2 and the bent lead terminal 2a, and is integrated with the capacitor body 2 as shown in FIG. At this time, in the two lead terminals 2a, the portion exposed on the back surface 4d of the bottom wall 4 is accommodated in the groove 4b and does not protrude. Therefore, the surface mount capacitor 1 can be self-supporting as shown in FIG.

  As shown in FIG. 2, the side walls 5 are formed in the vicinity of the four corners of the bottom wall 4. The four side walls 5 have the same shape. The four side walls 5 are arranged such that the distances between the center positions 5d in the circumferential direction of the capacitor body 2 are equal to each other. That is, the four side walls 5 are arranged at equiangular intervals with respect to the central axis C. The four side walls 5 are arranged so that the distances from the central axis C of the capacitor body 2 of the capacitor body 2 are equal to each other. Each side wall 5 has a symmetrical shape with respect to a virtual plane 22 that passes through the central axis C and forms an angle of 45 degrees with respect to both of the two virtual planes 20 and 21. The four side walls 5 have a first arc surface 55 that is a part of a first circumference centering on the central axis C of the capacitor body 2 and having a larger radius than the capacitor body 2 on the inner surface. Further, the four side walls 5 have second arcuate surfaces 56 that are concentric with the first circumference and are part of a second circumference having a larger radius than the first circumference on the outer surface. In each side wall 5, the thickness between the two arcuate surfaces 55 and 56 is uniform.

  The seat plate 3 as described above is generally manufactured by injection molding. Therefore, as in the present embodiment, the uniform thickness of the side wall 5 can further prevent the occurrence of distortion, warpage, and the like. Note that the four side walls 5 do not have to have a uniform thickness.

  Both end portions in the circumferential direction sandwiching the second arc surface 56 on the outer surface of each side wall 5 form a plane parallel to the Z direction connected to the side surface of the bottom wall 4 as the same surface. Convex ridges 5 c that are convex toward the central axis C of the capacitor body 2 are formed at both ends in the circumferential direction sandwiching the first arc surface 55 on the inner side surface of each side wall 5. The protrusion 5c is formed to extend in the Z direction, and the tip of the protrusion 5c closest to the capacitor body 2 in the radial direction of the capacitor body 2 is the contact portion 5a. That is, only two contact portions 5 a are in contact with the outer peripheral surface of the capacitor body 2 among the inner side surfaces of the side walls 5. That is, the four side walls 5 are each formed with eight contact portions 5 a that are in contact with the outer peripheral surface of the capacitor body 2, two in total. At this time, the eight contact portions 5a extend in the axial direction of the capacitor body 2 and are in contact with the outer peripheral surface of the capacitor body 2 in a wide range in the Z direction from the lower end to the upper end of each.

  Here, the shape change of the seat plate 3 before and after holding the capacitor body 2 will be described. FIG. 4A shows a state in which the capacitor body 2 is not held by the seat plate 3, more precisely, in the process of mounting the capacitor body 2 to the seat plate 3, the bottom corner of the capacitor body 2 is at the upper end of the side wall 5. FIG. 3 is a partial cross-sectional view of the surface mount capacitor 1 at the time of contact. At this time, if the side wall 5 is not deformed, the two contact portions 5 a of each side wall 5 are equidistant from the central axis C of the capacitor body 2 and slightly central axis C from the outer peripheral surface of the capacitor body 2. Close to the location. As shown in FIG. 4A, in a state where the capacitor main body 2 is not held, the four side walls 5 provided on the seat plate 3 are positioned inward toward the upper end side with respect to the Z direction. Inclined. Therefore, in a state where the capacitor main body 2 is not held by the seat plate 3, the contact portion 5 a that is the tip portion of the protrusion 5 c is closer to the central axis C as it is closer to the upper end of the sidewall 5. For example, in the state where the capacitor body 2 is not held, when the outer diameter of the capacitor body 2 attached to the seat plate 3 is 12.5 to 20 mm, the upper end of the contact portion 5a provided on each side wall 5 from the central axis C Is 0.05 to 0.2 mm smaller than the distance from the central axis C to the lower end of the contact portion 5 a provided on each side wall 5. As will be described later, an inclined surface 5b is provided on the inner part of the upper end of each side wall 5 by chamfering. As a method of inclining the side wall 5 as shown in FIG. 4A, for example, shrinkage of the resin after being taken out from the mold can be used.

  In order to hold the capacitor body 2 on the seat plate 3, the capacitor body 2 is further pushed downward from the state shown in FIG. At this time, the side wall 5 made of resin is elastically deformed radially outward along the outer peripheral surface of the capacitor body 2 by being pushed radially outward by the capacitor body 2. FIG. 4B is a cross-sectional view of the surface-mounted capacitor 1 along the line AA in FIG. 2 in a state where the capacitor body 2 is held by the seat plate 3. In the state shown in FIG. 4B, the capacitor body 2 is pressed by eight contact portions 5 a formed on the four side walls 5 in the direction toward the central axis C. Thereby, the capacitor body 2 is firmly held by the seat plate 3. 4B represents the direction of the elastic force applied from the contact portion 5a to the capacitor body (the direction toward the central axis C of the capacitor body 2).

  Further, since the side wall 5 made of resin can be elastically deformed in a direction away from and contacting the capacitor body 2, even if the outer shape of the capacitor body 2 and / or the side wall 5 is distorted or the like, the deformation amount is not more than a predetermined range. Even if it is deformed, the side wall 5 follows the deformation and elastically deforms in both the inner and outer directions in the radial direction. Therefore, in this embodiment, it is ensured that the two contact portions 5 a of each side wall 5 are in contact with the outer peripheral surface of the capacitor body 2.

  Here, the arrangement of the eight contact portions 5a will be further described. For the following description, reference numerals for distinguishing the eight contact portions 5a are attached. That is, in FIG. 2, when the center axis C of the capacitor body 2 is the origin, the contact portion having the maximum Y coordinate value among the contact portions having a positive X coordinate value is defined as the contact portion 5a2, and the clockwise rotation with reference to this. The contact portion 5a4, the contact portion 5a6, the contact portion 5a8, the contact portion 5a7, the contact portion 5a5, the contact portion 5a3, and the contact portion 5a1 are sequentially formed. Thereby, the contact portion 5a2 and the contact portion 5a4 are on the side wall 5 in the region where the X coordinate value is positive and the Y coordinate value is also positive, and the contact portion is on the side wall 5 in the region where the X coordinate value is positive and the Y coordinate value is negative. 5a6 and contact part 5a8 are side walls 5 in which the X coordinate value is negative and the Y coordinate value is also negative, and the contact parts 5a5 and contact part 5a7 are side walls in which the X coordinate value is negative and the Y coordinate value is positive. 5, the contact portion 5a1 and the contact portion 5a3 are respectively formed. Of the two contact portions formed on each side wall 5, the Y coordinate value is larger in the first described portion than the one described later.

  In the present embodiment, the eight contact portions 5a1, 5a2, 5a3, 5a4, 5a5, 5a6, 5a7, and 5a8 are any two contact portions adjacent to each other along the circumferential direction of the capacitor body 2 and the center of the capacitor body 2. The angles formed by the axes C are arranged to be equal to each other. That is, the angle formed by any two adjacent contact portions along the circumferential direction and the central axis C is 45 degrees. The angle formed by the line segment connecting the contact portion 5a1 and the central axis C and the YZ virtual plane 21 is 22.5 degrees. Therefore, the eight contact portions 5a1, 5a2, 5a3, 5a4, 5a5, 5a6, 5a7, 5a8 are arranged symmetrically with respect to both the XZ virtual plane 20 and the YZ virtual plane 21. In addition, although description is abbreviate | omitted here, as FIG. 2 clearly shows, the virtual plane used as the reference plane axisymmetric with respect to the eight contact parts 5a is plural other than XZ virtual plane 20 and YZ virtual plane 21. Exists.

  As described above, the eight contact portions 5a1, 5a2, 5a3, 5a4, 5a5, 5a6, 5a7, and 5a8 are arranged line-symmetrically with respect to the XZ virtual plane 20, and therefore the eight contact portions 5a are XZ virtual. Four pieces are provided across the plane 20. Furthermore, since the eight contact portions 5a1, 5a2, 5a3, 5a4, 5a5, 5a6, 5a7, 5a8 are arranged line-symmetrically with respect to the YZ virtual plane 21, the contact portion 5a1 and the contact portion 5a2 have a Y coordinate. The values are the same, the X coordinate values differ only in the sign, and the absolute values are the same. Similarly, the contact part 5a3 and the contact part 5a4, the contact part 5a5 and the contact part 5a6, and the contact part 5a7 and the contact part 5a8 also have the same Y-coordinate value, different X-coordinate values, and the same absolute value. . In other words, in this embodiment, the contact portion 5a1 and the contact portion 5a2, the contact portion 5a3 and the contact portion 5a4, the contact portion 5a5 and the contact portion 5a6, and the contact portion 5a7 and the contact portion 5a8 are arranged in the X direction ( That is, the Y coordinate values are the same as each other), and the four contact portion pairs are provided two by two with the XZ virtual plane 20 in between.

  Further, a chamfering process is performed on the inner part of the upper end of each side wall 5. By this chamfering process, as shown in FIG. 4A, an inclined surface 5 b is formed on the inner portions of the upper ends of the four side walls 5.

  As described above, in the present embodiment, the four side walls 5 are arranged in the vicinity of the four corners of the bottom wall 4, and each side wall 5 is provided with two ridges 5 c each having one contact portion 5 a. Yes. Therefore, the capacitor body 2 can be held so as to be surrounded by the eight contact portions 5a formed on the four side walls 5 and in contact with the capacitor body 2 and provided on the total eight ridges 5c.

  Here, the capacitor body 2 and the seat plate 3 may be deformed such as distortion in the manufacturing process. In this embodiment, each side wall 5 is formed with two ridges 5c each having a contact portion 5a. In addition, each side wall 5 can be elastically deformed in a direction in which it is separated from and in contact with the capacitor body 2. Therefore, even if such deformation occurs, it is possible to prevent a situation in which the contact portion 5a does not contact the outer peripheral surface of the capacitor body 2. Therefore, the balance of holding of the capacitor body 2 by the side wall 5 is not lost, and the capacitor body 2 is stably held by the seat plate 3, so that sufficient strength against vibration and impact can be obtained. On the other hand, when the number of the contact portions 5a formed on each side wall 5 is three or more, even when each side wall 5 can be elastically deformed in the direction of separating from and contacting the capacitor body 2, the above-mentioned is described. When such deformation occurs, the contact portion 5a does not come into contact with the outer peripheral surface of the capacitor body 2 at a higher rate. In addition, when the number of contact portions formed on each side wall is one, the number of contact portions 5a that contact each side wall 5 is too small, so that the capacitor body 2 cannot be held in a stable state. Or when the width | variety of the circumferential direction of the capacitor | condenser main body 2 of each side wall 5 and thickness are small, since the intensity | strength becomes low, there exists a possibility that a damage may arise.

  A total of eight contact portions 5a elastically press the outer peripheral surface of the capacitor body 2 at different positions in the circumferential direction. Thereby, the holding power of the capacitor body 2 is improved, and the vibration resistance and the impact resistance are further improved.

  In the present embodiment, the eight contact portions 5 a are arranged symmetrically with respect to at least one virtual plane (for example, the XZ virtual plane 20 and the YZ virtual plane 21) including the central axis C of the capacitor body 2. . Thereby, the balance of holding of the capacitor body 2 by the four side walls 5 can be further increased. Furthermore, in the present embodiment, the eight contact portions 5a are arranged so that the angles formed by any two contact portions 5a adjacent in the circumferential direction and the central axis C of the capacitor body 2 are equal to each other. Therefore, the balance of holding the capacitor body 2 by the four side walls 5 can be further increased.

  By the way, when vibration is applied to the surface-mounted capacitor 1, the lead terminal 2a inserted through the insertion hole 4a may come into contact with the inner surface of the insertion hole 4a. In particular, when vibration in the Y direction is applied to the surface mount capacitor 1, as can be seen from FIG. 2, the load tends to concentrate near the bent portion of the lead terminal 2a that contacts the inner surface of the insertion hole 4a. The terminal 2a may be worn and broken.

  In the present embodiment, four contact portions 5a are provided with an XZ virtual plane 20 including the central axis C of the capacitor body 2 parallel to the direction in which the two insertion holes 4a are arranged. Therefore, when the vibration in the Y direction is applied to the surface mount capacitor 1, the amplitude of the capacitor body 2 in the Y direction can be kept small, so that the vibration resistance against the Y direction vibration is improved. In particular, in the present embodiment, two contact portion pairs each including two contact portions 5a arranged in the X direction are provided with the XZ virtual plane 20 interposed therebetween. Therefore, since vibration can be effectively suppressed by the two contact portion pairs, vibration resistance against Y-direction vibration can be further improved.

  In the present embodiment, the contact portions 5 a are provided at both end portions of the side wall 5 in the circumferential direction of the capacitor body 2. Thereby, the impact applied to each side wall 5 can be disperse | distributed equally. Further, four side walls 5 are provided, and any two adjacent side walls 5 in the circumferential direction are formed such that the distances between the circumferential center positions 5d are equal to each other. Thereby, the balance of holding of the capacitor body 2 by the four side walls 5 can be improved. In the present embodiment, each side wall 5 has a symmetrical shape with respect to a virtual plane 22 that passes through the central axis C and forms an angle of 45 degrees with respect to both of the two virtual planes 20 and 21.

  Furthermore, the location closest to the central axis of the capacitor body 2 is the two contact portions 5a on the inner surface of each side wall 5, and the region sandwiched between these two contact portions 5a on the inner surface of each side wall 5 Is disposed outside the outer peripheral surface of the capacitor body 2. Therefore, each side wall 5 reliably contacts the outer peripheral surface of the capacitor body 2 only at the contact portion 5a provided on the side wall 5.

  And the four side walls 5 become the inclined surface 5b by chamfering the inner part of the upper end. Therefore, when the capacitor body 2 is attached, the capacitor body 2 is inserted while being guided by the inclined surface 5b. Thereby, the capacitor | condenser main body 2 can be attached smoothly.

  In addition, each contact portion 5a is formed to extend in the Z direction, and the contact portion 5a and the outer peripheral surface of the capacitor body 2 are in contact with each other in a wide range in the Z direction. Therefore, for example, the balance of holding of the capacitor body 2 can be further improved as compared with a case where the contact portion 5a and the outer peripheral surface of the capacitor body 2 are in point contact.

  Further, the four side walls 5 are in contact with the outer peripheral surface of the capacitor body 2 above the axial center position, and are pressed in the direction toward the central axis C. Therefore, the capacitor body 2 is held higher by the four side walls 5. Thereby, the holding power of the capacitor body 2 is improved, and the vibration resistance and the impact resistance are further improved.

  Next, five modified examples of the side wall in the present embodiment will be described with further reference to FIGS. In the following description, only the side wall in which both the X coordinate value and the Y coordinate value are in the positive region will be described. However, in each modified example, the other three side walls have the same shape as illustrated.

  In the modification shown in FIG. 5A, the side walls 26 are formed in a substantially bow shape so that the vicinity of both ends in the circumferential direction of the capacitor body 2 is closest to the central axis C of the capacitor body 2 when viewed from above. Has been. Specifically, the side wall 26 has an arc surface that is a part of a circumference having a smaller radius than the capacitor body 2 on the inner side surface. Then, both ends of the arc surface in the circumferential direction of the capacitor main body 2 become contact portions 26 a that come into contact with the outer peripheral surface of the capacitor main body 2. That is, only two contact portions 26 a are in contact with the outer peripheral surface of the capacitor body 2 among the inner side surfaces of the side wall 26 that forms a curved surface. The contact portion 26a extends in the axial direction of the capacitor body 2 and is in line contact with the outer peripheral surface of the capacitor body 2 from the lower end to the upper end. In addition, the outer side surface of the side wall 26 does not pass through the central axis C and forms a central plane that forms an angle of 45 degrees with respect to both of the two virtual planes 20 and 21 and side surfaces of the bottom wall 4 provided on both sides thereof. It is comprised from the edge part plane connected as this and the same surface. Further, the inner surface of the side wall 26 includes a curved surface connecting the end plane and the arc surface in addition to the arc surface described above. An inclined surface 26 b is formed at the upper end of the inner surface of the side wall 26 by chamfering.

  In the modification shown in FIG. 5B, the side wall 27 has a substantially V-shape when viewed from above. Specifically, the side wall 27 is symmetrical from the central part farthest from the central axis C of the capacitor body 2 to the outer peripheral surface of the capacitor body 2 symmetrically with respect to the radial direction connecting the central part and the central axis C of the capacitor body 2. The flat area | region which has the predetermined thickness extended in the direction which approaches each is included. The outer surface of the side wall 27 is configured only by a plane far from the central axis C of the capacitor body 2 in a flat region. The inner surface of the side wall 27 is composed of a flat surface near the central axis C of the capacitor body 2 in a flat region and a curved surface connecting the flat surface and the outer surface. A boundary portion between the plane of the inner surface of the side wall 27 and the curved surface becomes a contact portion 27 a that contacts the outer peripheral surface of the capacitor body 2. The contact portion 27a extends in the axial direction of the capacitor body 2 and is in line contact with the outer peripheral surface of the capacitor body 2 from the lower end to the upper end. Further, an inclined surface 27 b is formed on the upper end of the inner surface of the side wall 27 by chamfering.

  In the modification shown in FIG. 5 (c), the side wall 28 has a predetermined thickness when viewed from above, and a linearly extending central portion 28e, and both ends thereof form an obtuse angle with respect to the central portion 28e. And two connected end portions 28d. The central portion 28e is sandwiched between an outer central plane and an inner central plane that do not pass through the central axis C and form an angle of 45 degrees with respect to both of the two virtual planes 20 and 21. The two end portions 28 d extend linearly toward the outer peripheral surface of the capacitor main body 2 along the side surface of the bottom wall 4. The outer side surface of the side wall 28 is composed of an outer central plane of the central portion 28e and an outer end plane of the end portion 28d connected to the side surface of the bottom wall 4 as the same plane. The inner surface of the side wall 28 includes an inner central plane of the central portion 28e, an inner end plane of the end portion 28d parallel to the outer end plane, and a curved surface connecting the outer end plane and the inner end plane. A boundary portion between the inner end plane of the inner surface of the side wall 28 and the curved surface becomes a contact portion 28 a that contacts the outer peripheral surface of the capacitor body 2. The contact portion 28a extends in the axial direction of the capacitor body 2 and is in line contact with the outer peripheral surface of the capacitor body 2 from the lower end to the upper end of each. The upper end of the inner side surface of the side wall 28 is chamfered to form an inclined surface 28b.

  In the modification shown in FIG. 5D, the side wall 29 has a central portion 29d having a predetermined thickness and extending linearly when viewed from above. The central portion 29d has a uniform thickness portion sandwiched between an outer central plane and an inner central plane that do not pass through the central axis C and form an angle of 45 degrees with respect to both of the two virtual planes 20 and 21. ing. The outer surface of the side wall 29 is composed of an outer central plane of the central portion 29d and an outer end plane connected to the outer central plane at an obtuse angle (smaller than the angle formed by the outer central plane and the side surface of the bottom wall 4). ing. The inner surface of the side wall 29 includes the inner center plane of the center portion 29d. Convex ridges 29 c are formed at both ends of the inner central plane of the central portion 29 d so as to protrude toward the outer peripheral surface of the capacitor body 2. The ridge 29c is formed to extend in the Z direction, and the tip of the ridge 29c closest to the capacitor body 2 in the radial direction of the capacitor body 2 is the contact portion 29a. Since the angle formed by the outer center plane and the outer end plane is smaller than that of the modification shown in FIG. 5C, the distance between the two contact portions 29a is two in the modification shown in FIG. It is smaller than the distance between the contact portions 28a. The contact portion 29a extends in the axial direction of the capacitor body 2 and is in line contact with the outer peripheral surface of the capacitor body 2 from the lower end to the upper end of each. Further, the upper end of the inner side surface of the side wall 29 is chamfered to form an inclined surface 29b.

  In the modification shown in FIG. 5 (e), the side wall 30 has an arc surface whose inner side surface is larger in diameter than the outer peripheral surface of the capacitor body 2. The center of this arc surface is on the central axis C of the capacitor body 2. In addition, two protrusions 30 c are formed on the inner side surface at both ends in the circumferential direction of the capacitor body 2. The ridge 30c is formed to extend in the Z direction, and the tip of the ridge 30c closest to the capacitor body 2 in the radial direction of the capacitor body 2 is the contact portion 30a. The contact portion 30a extends in the axial direction of the capacitor body 2 and is in line contact with the outer peripheral surface of the capacitor body 2 from the lower end to the upper end of each. Further, the upper end of the inner surface of the side wall 30 is chamfered to form an inclined surface 30b. The outer side surface of the side wall 30 is composed of two mutually orthogonal planes connected to the two side surfaces sandwiching the corner portion of the bottom wall 4 as the same surface.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. The only difference between the surface-mount capacitor according to the present embodiment and the first embodiment is the shape of the side wall of the seat plate, and the following description will focus on that point. The same reference numerals are used for the same members as those in the first embodiment, and the description thereof is omitted.

  FIG. 6 shows a surface mount capacitor according to this embodiment. On the seat plate 13 included in the surface mount capacitor, four side walls 15 are formed so as to surround the capacitor body 2. The four side walls 15 have the same shape. However, in the present embodiment, unlike the first embodiment, each side wall 15 passes through the central axis C and forms an angle of 45 degrees with respect to both of the two virtual planes 20 and 21. It has an asymmetric shape. Specifically, each side wall 15 has a distance between one end portion arranged at a position where the absolute value of the Y coordinate is large and the virtual plane 21, and the other end portion arranged at a position where the absolute value of the Y coordinate is small and the virtual plane. The asymmetrical shape is smaller than the distance to 20.

  Each side wall 15 is formed in a substantially bow shape so that the vicinity of both ends in the circumferential direction of the capacitor body 2 is closest to the central axis C of the capacitor body 2 when viewed from above. Specifically, the side wall 15 has an arcuate surface on its inner surface. Then, both ends of the arcuate surface in the circumferential direction of the capacitor main body 2 become contact portions 15 a that come into contact with the outer peripheral surface of the capacitor main body 2. That is, only the two contact portions 15 a are in contact with the outer peripheral surface of the capacitor body 2 among the inner surfaces of the side walls 15. Further, the outer surface of the side wall 15 does not pass through the central axis C and forms a central plane that forms an angle of 45 degrees with respect to both the two virtual planes 20 and 21 and the side surfaces of the bottom wall 4 provided on both sides thereof. It is comprised from the edge part plane connected as this and the same surface. Further, the inner surface of the side wall 15 includes a curved surface connecting the end surface and the arcuate surface in addition to the arcuate surface described above.

  On the four side walls 15, two contact portions 15 a that come into contact with the outer peripheral surface of the capacitor main body 2 are formed, for a total of eight. The eight contact portions 15 a extend in the axial direction of the capacitor body 2 and are in line contact with the outer peripheral surface of the capacitor body 2 from the lower end to the upper end of each. Further, an inclined surface 15b is formed at the upper end of the inner side surface of each side wall 15 by chamfering.

  Here, the arrangement of the eight contact portions 15a will be further described. For the following description, reference numerals for distinguishing the eight contact portions 15a are attached. That is, in FIG. 6B, when the central axis C of the capacitor body 2 is the origin, the contact portion having the maximum Y coordinate value among the contact portions having a positive X coordinate value is defined as the contact portion 15a2. As a contact portion 15a6, a contact portion 15a8, a contact portion 15a4, a contact portion 15a3, a contact portion 15a7, a contact portion 15a5, and a contact portion 15a1. Thereby, the contact portion 15a2 and the contact portion 15a6 are on the side wall 15 in the region where the X coordinate value is positive and the Y coordinate value is also positive, and the contact portion is on the side wall 15 in the region where the X coordinate value is positive and the Y coordinate value is negative. 15a4 and the contact portion 15a8 are the side wall 15 in the region where the X coordinate value is negative and the Y coordinate value is negative, and the contact portion 15a3 and the contact portion 15a7 are the side walls in the region where the X coordinate value is negative and the Y coordinate value is positive. 15 are formed with a contact portion 15a1 and a contact portion 15a5, respectively. Of the two contact portions formed on each side wall 15, the first value described has a larger absolute value in the Y coordinate than the one described later.

  Accordingly, in each side wall 15, the distances between the contact portions 15 a 1, 15 a 2, 15 a 3, 15 a 4 arranged at positions where the absolute value of the Y coordinate is large and the virtual plane 21 are arranged at positions where the absolute value of the Y coordinate is small. It is smaller than each distance between the contact portions 15a5, 15a6, 15a7, 15a8 and the virtual plane 20. That is, the circumferential distance between two contact portions 15a1, 15a2; 15a3, 15a4 adjacent to each other along the circumferential direction arranged with the virtual plane 21 interposed therebetween is along the circumferential direction arranged with the virtual plane 20 interposed therebetween. It is smaller than the circumferential distance between two adjacent contact portions 15a5, 15a7; 15a6, 15a8. Furthermore, in this embodiment, the circumferential distance between the two contact portions 15a5, 15a7; 15a6, 15a8 adjacent to each other along the circumferential direction arranged across the virtual plane 20 is the two contact portions belonging to the same side wall 15. It is smaller than the circumferential distance between them. Therefore, the angle formed by the contact portion 15a1, the central axis C, and the contact portion 15a2 and the angle formed by the contact portion 15a3, the central axis C, and the contact portion 15a4 are other adjacent ones along the circumferential direction of the capacitor body 2. It is smaller than the angle formed by any two contact portions 15a and the central axis C. An angle formed by the contact portion 15a1, the central axis C, and the contact portion 15a2 and an angle formed by the contact portion 15a3, the central axis C, and the contact portion 15a4 are, for example, 15 degrees. Further, the angle formed by the other two contact portions 15a adjacent to each other along the circumferential direction of the capacitor body 2 and the central axis C is, for example, 60 degrees.

  Further, the eight contact portions 15a1, 15a2, 15a3, 15a4, 15a5, 15a6, 15a7, 15a8 are arranged so as to be line symmetric with respect to both the XZ virtual plane 20 and the YZ virtual plane 21. Accordingly, the contact portion 15a1 and the contact portion 15a2 have the same Y coordinate value, differ only in the sign of the X coordinate value, and have the same absolute value. Similarly, the contact part 15a5 and the contact part 15a6, the contact part 15a7 and the contact part 15a8, and the contact part 15a3 and the contact part 15a4 also have the same Y-coordinate value, different X-coordinate values, and the same absolute value. . In other words, in this embodiment, the contact portion 15a1 and the contact portion 15a2, the contact portion 15a3 and the contact portion 15a4, the contact portion 15a5 and the contact portion 15a6, and the contact portion 15a7 and the contact portion 15a8 are arranged in the X direction ( That is, a pair of contact portions having the same Y coordinate value is formed, and two pairs of contact portions are provided across the XZ virtual plane 20 (four contact portion pairs in total). .

  In the present embodiment described above, the angle formed by the contact portion 15a1, the central axis C, and the contact portion 15a2 and the angle formed by the contact portion 15a3, the central axis C, and the contact portion 15a4 are in the circumferential direction of the capacitor body 2. It is smaller than the angle formed by any other two contact portions 15a adjacent to each other along the central axis C. Therefore, when the Y direction vibration is applied to the capacitor, the amplitude of the capacitor body 2 in the Y direction can be further reduced. Therefore, the vibration resistance against the Y-direction vibration is further improved. Thereby, it can prevent that the lead terminal 2a contacts the inner surface of the insertion hole 4a formed in the bottom face 4c of the capacitor | condenser main body 2, and wears out.

(Third embodiment)
Next, a third embodiment of the present invention will be described. The only difference between the surface-mount capacitor according to the present embodiment and the first embodiment is the shape of the side wall of the seat plate, and the following description will focus on that point. The same reference numerals are used for the same members as those in the first embodiment, and the description thereof is omitted.

  A surface-mount capacitor according to this embodiment is shown in FIG. On the seat plate 23 included in the surface mount capacitor, six side walls 24 and 25 are formed so as to surround the capacitor body 2.

  Of the six side walls 24, 25, the four side walls 25 provided near the XZ virtual plane 20 have the same shape. These four side walls 25 are V-shaped as shown in FIG. The inner surface of each side wall 25 includes two planes connected at an obtuse angle. The outer surface of each side wall 25 also includes two planes connected at an obtuse angle. One of the two planes belonging to the outer side surface is connected to the side surface of the bottom wall 4 as the same plane. Further, the outer end of each plane belonging to the inner surface and the outer end of each plane belonging to the outer surface are connected by a minute curved surface constituting a part of the inner surface. Each side wall 25 is disposed so as to be asymmetric with respect to the virtual plane 22 that passes through the central axis C and forms an angle of 45 degrees with respect to both of the two virtual planes 20 and 21. Specifically, the four side walls 25 are arranged on the XZ virtual plane 20 side in the circumferential direction of the capacitor body 2. In other words, the four side walls 25 are arranged such that the distance between the one end portion arranged at the position where the absolute value of the Y coordinate is large and the virtual plane 21 is the other end portion arranged at the position where the absolute value of the Y coordinate is small and the virtual plane. It is arrange | positioned so that it may become larger than the distance with 20.

  Out of the inner side surfaces of the four side walls 25, both ends in the circumferential direction of the capacitor main body 2 that are closest to the central axis C of the capacitor main body 2 become contact portions 25 a that come into contact with the outer peripheral surface of the capacitor main body 2. That is, of the inner side surfaces of the four side walls 25, only two contact portions 25 a are in contact with the outer peripheral surface of the capacitor body 2.

  Of the six side walls 24 and 25, the two side walls 24 arranged so as to straddle the YZ virtual plane 21 have the same shape. The two side walls 24 have a substantially flat plate shape with a short circumferential length of the capacitor body 2. The inner surface of each side wall 24 includes two planes connected at an obtuse angle (greater than the angle formed by the two planes belonging to the inner surface of the side wall 25). The outer surface of each side wall 24 is constituted by a plane connected to the side surface of the bottom wall 4 as the same surface. Furthermore, the outer edge of each plane belonging to the inner surface and the outer edge of the plane constituting the outer surface are connected by a minute curved surface constituting a part of the inner surface. The two side walls 24 are arranged so as to be symmetric with respect to the YZ virtual plane 21. In other words, in each side wall 24, the distance between one circumferential end of the capacitor body 2 and the YZ virtual plane 21 and the distance between the other circumferential end of the capacitor body 2 and the YZ virtual plane 21 are equal to each other. Has been placed. Further, the two side walls 24 are formed so that the distance between both end portions in the circumferential direction of the capacitor body 2 is smaller than the four side walls 25 described above.

  Of the inner side surfaces of the two side walls 24, both ends in the circumferential direction of the capacitor body 2 that are closest to the central axis C of the capacitor body 2 become contact portions 24 a that come into contact with the outer peripheral surface of the capacitor body 2. That is, of the inner side surfaces of the two side walls 24, only two contact portions 24 a are in contact with the outer peripheral surface of the capacitor body 2.

  That is, a total of twelve contact portions 25 a and 24 a that are in contact with the outer peripheral surface of the capacitor body 2 are formed on the six side walls 24 and 25 in total. At this time, the contact portions 25a and 24a extend in the axial direction of the capacitor body 2 and are in line contact with the outer peripheral surface of the capacitor body 2 from the lower end to the upper end. In addition, inclined surfaces 25b and 24b are formed on the upper ends of the inner side surfaces of the side walls 25 and 24 by chamfering.

  Here, the arrangement of the twelve contact portions 25a and 24a will be further described. For the following description, reference numerals for distinguishing the twelve contact portions 25a and 24a are attached. That is, in FIG. 7, when the center axis C of the capacitor body 2 is the origin, the contact portion having the largest Y coordinate value among the contact portions having a positive X coordinate value is defined as the contact portion 24a2, and the clockwise rotation with reference thereto. The contact part 25a5, the contact part 25a6, the contact part 25a8, the contact part 25a7, the contact part 24a4, the contact part 24a3, the contact part 25a3, the contact part 25a4, the contact part 25a2, the contact part 25a1, and the contact part 24a1 are sequentially provided. Thereby, the contact portion 25a5 and the contact portion 25a6 are on the side wall 25 in the region where the X coordinate value is positive and the Y coordinate value is also positive, and the contact portion is on the side wall 25 in the region where the X coordinate value is positive and the Y coordinate value is negative. 25a7 and the contact portion 25a8 are the side wall 25 in the region where the X coordinate value is negative and the Y coordinate value is negative, and the contact portion 25a3 and the contact portion 25a4 are the side wall in the region where the X coordinate value is negative and the Y coordinate value is positive. 25, a contact portion 25a1 and a contact portion 25a2 are formed. Of the two contact portions formed on each side wall 25, the first described one has a larger absolute value in the Y coordinate than the one described later. Further, the contact portion 24a1 and the contact portion 24a2 are formed on the side wall 24 in the region where the Y coordinate value is positive, and the contact portion 24a3 and the contact portion 24a4 are formed on the side wall 24 in the region where the Y coordinate value is negative. become.

  Here, the angle formed by the contact portion 24a1, the central axis C, the contact portion 24a2, and the contact portion 24a3, the central axis C, and the contact portion 24a4 is any other two adjacent contacts along the circumferential direction of the capacitor body 2. Smaller than the angle formed by the center axis C. More specifically, the angle formed by the contact portion 24a1, the central axis C, the contact portion 24a2, and the contact portion 24a3, the central axis C, and the contact portion 24a4 is, for example, 20 degrees. Moreover, the angle which the two contact parts 25a formed in the four side walls 25 and the central axis C make is, for example, 45 degrees. Moreover, the angle which the contact part 25a adjacent to the circumferential direction of the capacitor | condenser main body 2, the contact part 24a, and the central axis C makes is 25 degree | times, for example. Further, the angle formed by the contact portions 25a6, 25a8; 25a2, 25a4 adjacent to the XZ virtual plane 20 and the central axis C is, for example, 20 degrees.

  The twelve contact portions 25a1, 25a2, 25a3, 25a4, 25a5, 25a6, 25a7, 25a8, 24a1, 24a2, 24a3, and 24a4 are line-symmetric with respect to both the XZ virtual plane 20 and the YZ virtual plane 21. It is arranged to be. Therefore, the contact portion 24a1 and the contact portion 24a2 have the same Y coordinate value, differ only in the sign of the X coordinate value, and have the same absolute value. Similarly, the contact part 25a1 and the contact part 25a5, the contact part 25a2 and the contact part 25a6, the contact part 25a4 and the contact part 25a8, the contact part 25a3 and the contact part 25a7, and the contact part 24a3 and the contact part 24a4 have the same Y coordinate value. The X coordinate values are different only in sign and have the same absolute value. In other words, in this embodiment, the contact part 24a1 and the contact part 24a2, the contact part 25a1 and the contact part 25a5, the contact part 25a2 and the contact part 25a6, the contact part 25a4 and the contact part 25a8, the contact part 25a3 and the contact part 25a7, and the contact part. Each of the contact portions 24a3 and the contact portions 24a4 forms a contact portion pair arranged in the X direction (that is, the Y coordinate values are the same). (6 contact portion pairs in total) are provided.

  In the present embodiment described above, the angle formed by the contact portion 24a1, the central axis C, the contact portion 24a2, and the contact portion 24a3, the central axis C, and the contact portion 24a4 is any other arbitrary adjacent in the circumferential direction of the capacitor body 2. It is smaller than the angle formed by the two contact portions 24a, 25a. The two side walls 24 are arranged so as to be symmetric with respect to the YZ virtual plane 21. Therefore, when the Y direction vibration is applied to the capacitor, the amplitude of the capacitor body 2 in the Y direction can be further reduced. Therefore, the vibration resistance against the Y-direction vibration is further improved. Thereby, it can prevent that the lead terminal 2a contacts and wears the inner surface of the insertion hole 4a formed in the bottom face 4c of the capacitor | condenser main body 2. FIG.

  Further, three contact portion pairs are provided across the XZ virtual plane 20 (a total of six contact portion pairs). This also further improves the vibration resistance against the X-direction vibration and the Y-direction vibration as compared with the case where the number of contact portion pairs is small.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments and examples, and various design changes can be made as long as they are described in the claims. is there.

  In the first, second, and third embodiments described above, the number of side walls provided on the seat plate is four or six. However, the number of side walls is two or more, and the capacitor body As long as it can be held so that it surrounds, it does not matter.

  In the first, second, and third embodiments, it is described that the two contact portions formed on each side wall are formed at both ends in the circumferential direction, but the place where the two contact portions are formed. This is not the case. The two contact portions may be provided, for example, in the central portion in the circumferential direction of the capacitor main body on the inner side surface of the side wall.

  In the first, second, and third embodiments, eight or twelve contact portions are described as being in contact from the lower end to the upper end, but a part of the contact portion is not in contact. It doesn't matter. For example, the contact portion may have a shape in which only the upper end portion thereof is in contact with the outer peripheral surface of the capacitor body 2. Thereby, since a space is formed between the capacitor body and the lower portion of the side wall, the heat of the capacitor body can be released and the capacitor body can be cooled more efficiently.

  Further, in the first embodiment, the eight contact portions 5 a formed on the four side walls 5 are arranged so as to be line-symmetrically arranged four by four across the XZ virtual plane 20 including the central axis C of the capacitor body 2. Although described as being carried out, the eight contact parts 5a do not need to be arranged in line symmetry. Furthermore, the side walls according to the five modified examples shown in FIGS. 5A to 5E may be applied to the side walls according to the second or third embodiment.

DESCRIPTION OF SYMBOLS 1 Surface mount type capacitor 2 Capacitor main body 2a Lead terminal 3 Seat plate 4 Bottom wall 5 Side wall 5a Contact part 5b Inclined surface 5c Projection

Claims (10)

A surface mount type capacitor comprising a cylindrical capacitor body and a seat plate for holding the capacitor body,
The seat plate includes a bottom wall in which the capacitor body is disposed and two insertion holes through which two terminals drawn from the capacitor body are inserted, and an axial direction of the capacitor body from the bottom wall. A plurality of sidewalls extending to
The plurality of side walls can be elastically deformed in a direction of separating from and contacting the capacitor body,
Each sidewall, the contact portion elastically presses at different positions an outer peripheral surface in the circumferential direction of the capacitor body, two possess closest point to the center axis of the capacitor body at the inner surface of each side wall,
The two insertion holes are arranged on the bottom wall so as to be aligned on a first virtual plane including a central axis of the capacitor body,
The plurality of contact portions are arranged so as to be provided at least four each across the first virtual plane,
Two contacts that are adjacent to each other along the circumferential direction that are arranged across a second virtual plane that is orthogonal to a direction parallel to the direction in which the two insertion holes are arranged on the bottom wall and includes the central axis of the capacitor body. The surface mount is characterized in that the angle formed by the center axis of the capacitor body and the capacitor body is smaller than the angle formed by any other two contact portions adjacent along the circumferential direction and the center axis of the capacitor Type capacitor. A surface mount type capacitor comprising a cylindrical capacitor body and a seat plate for holding the capacitor body,
The seat plate includes a bottom wall in which the capacitor body is disposed and two insertion holes through which two terminals drawn from the capacitor body are inserted, and an axial direction of the capacitor body from the bottom wall. A plurality of sidewalls extending to
The plurality of side walls can be elastically deformed in a direction of separating from and contacting the capacitor body,
Each sidewall, the contact portion elastically presses at different positions peripheral surface in the circumferential direction of the capacitor body, two possess closest point to the center axis of the capacitor body at the inner surface of each side wall,
The two insertion holes are arranged on the bottom wall so as to be aligned on a first virtual plane including a central axis of the capacitor body,
The plurality of contact portions are arranged so as to be provided at least six pieces across the first virtual plane,
Two contacts that are adjacent to each other along the circumferential direction that are arranged across a second virtual plane that is orthogonal to a direction parallel to the direction in which the two insertion holes are arranged on the bottom wall and includes the central axis of the capacitor body. The angle formed by the central axis of the capacitor body and the angle formed by the two contact portions adjacent to each other along the circumferential direction arranged across the first virtual plane and the central axis of the capacitor are the same The surface mount capacitor is characterized in that it is smaller than an angle formed by any other two contact portions adjacent along the circumferential direction and the central axis of the capacitor. Wherein the plurality of contact portions, surface mounting capacitor according to claim 1 or 2, characterized in that it is arranged in line symmetry with respect to the third imaginary plane including the central axis of the capacitor body. Wherein the plurality of contact portions, characterized in that the front SL contact portion pair consisting of two of said contact portions arranged in a direction are arranged to be provided by at least two sides of the said first imaginary plane The surface-mount type capacitor according to claim 1. The contact portion is a surface-mount capacitor according to any one of claims 1-4, characterized in that the said circumferential direction are provided at both ends of the side walls. The surface mount capacitor according to any one of claims 1 to 5 , wherein an inner part of an upper end of each of the plurality of side walls is chamfered. Each contact portion surface mounting capacitor according to any one of claims 1 to 6, characterized in that extending along the axial direction. Wherein the plurality of side walls, the surface according to any one of claims 1 to 7, characterized in that by pressing the capacitor body in the areas away from the bottom wall than the center position of the axial direction of the side wall Mounting type capacitor. A seat plate for holding a cylindrical capacitor body,
The capacitor body is disposed , and a bottom wall provided with two insertion holes through which two terminals drawn out from the capacitor body are respectively inserted, and extends from the bottom wall so as to be orthogonal to the bottom wall. A plurality of side walls;
The plurality of side walls can be elastically deformed in a direction away from and in contact with a central axis of the bottom wall,
When holding the capacitor body,
Two contact portions that elastically press the outer peripheral surface of the capacitor main body at different positions in the circumferential direction are formed on each side wall at a location closest to the central axis of the capacitor main body on the inner side surface of each side wall ,
The two insertion holes are arranged on the bottom wall so as to be aligned on a first virtual plane including a central axis of the capacitor body,
The plurality of contact portions are arranged so as to be provided at least four each across the first virtual plane,
Two contacts that are adjacent to each other along the circumferential direction that are arranged across a second virtual plane that is orthogonal to a direction parallel to the direction in which the two insertion holes are arranged on the bottom wall and includes the central axis of the capacitor body. The seat plate is characterized in that an angle formed by the central axis of the capacitor body and the capacitor body is smaller than an angle formed by any other two contact portions adjacent to each other along the circumferential direction and the central axis of the capacitor. . A seat plate for holding a cylindrical capacitor body,
The capacitor body is disposed , and a bottom wall provided with two insertion holes through which two terminals drawn out from the capacitor body are respectively inserted, and extends from the bottom wall so as to be orthogonal to the bottom wall. A plurality of side walls;
The plurality of side walls can be elastically deformed in a direction away from and in contact with a central axis of the bottom wall,
When holding the capacitor body,
Two contact portions that elastically press the outer peripheral surface of the capacitor main body at different positions in the circumferential direction are formed on each side wall at a location closest to the central axis of the capacitor main body on the inner side surface of each side wall ,
The two insertion holes are arranged on the bottom wall so as to be aligned on a first virtual plane including a central axis of the capacitor body,
The plurality of contact portions are arranged so as to be provided at least six pieces across the first virtual plane,
Two contacts that are adjacent to each other along the circumferential direction that are arranged across a second virtual plane that is orthogonal to a direction parallel to the direction in which the two insertion holes are arranged on the bottom wall and includes the central axis of the capacitor body. The angle formed by the central axis of the capacitor body and the angle formed by the two contact portions adjacent to each other along the circumferential direction arranged across the first virtual plane and the central axis of the capacitor are the same And the seat board characterized by being smaller than the angle which the arbitrary two contact parts adjacent along the said circumferential direction and the central axis of the said capacitor | condenser make.

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