WO2012077459A1 - Capacitor, method for producing capacitor, and substrate provided with circuit - Google Patents

Abstract

The present invention facilitates alterations of a production line in the case of production that uses an existing production line, and has superior handing of capacitor intermediate products during production. Provided is a capacitor having at least: a columnar capacitor body (20) having two electrode elements (24A, 24B) at one end surface (22A) and having a columnar protrusion (26) on the other end surface (22B); and an affixing auxiliary terminal (30A) attached to the capacitor body (20). The affixing auxiliary terminal (30A) has: a pressure-bonded affixed member (32A) that has been pressure bonded and affixed to the protrusion (26) in the state of pressing the outer peripheral surface of the protrusion (26) from at least two directions that are roughly perpendicular to the central axis (C1) of the protrusion (26); and a rod-shaped member (34) connected to the pressure-bonded affixed member (32A). Further provided are a method for producing the capacitor, and a substrate that is provided with a circuit and that uses the capacitor.

Description

Capacitor, capacitor manufacturing method, and circuit board

The present invention relates to a capacitor, a capacitor manufacturing method, and a circuit board. Snippet

When assembling various circuit boards with columnar capacitors, the capacitors are mounted on the board constituting the circuit board by soldering. At this time, the electrode terminal including two lead wires extending in the axial direction of the capacitor main body is soldered from one end face side of the capacitor main body while being inserted into a through hole provided in the substrate. However, in this case, since the capacitor is mounted in a state of being substantially perpendicular to the substrate, the electronic device including the circuit board cannot be reduced in thickness and size.

For this reason, there has been proposed a technique for mounting a capacitor on a circuit board with the capacitor lying on the board (see Patent Documents 1 to 5). In these technologies, one end made of a lead wire or the like that is sufficiently longer than the diameter of the capacitor body and that does not function electrically is provided on the end surface opposite to the side where the two electrode terminals of the capacitor body are provided. An auxiliary terminal is provided, and the capacitor is mounted on the substrate by inserting the auxiliary terminal into the through hole of the substrate and soldering together with the two electrode terminals. Further, by adopting such a mounting form, it is possible to ensure earthquake resistance. Note that the same effect as described above can be obtained when the capacitor is mounted on a circuit board with an adhesive, instead of using the auxiliary terminal.

However, in the method of mounting a capacitor using an adhesive, it takes time to dry the adhesive, and the working efficiency in the mounting process is reduced. For this reason, capacitors with auxiliary terminals as exemplified in Patent Documents 1 to 5 have a greater need from users who assemble a circuit board.

Japanese Patent Laid-Open No. 9-97741 (FIGS. 1, 15, etc.) Japanese Patent Laid-Open No. 64-55818 (FIGS. 4, 5, etc.) Japanese Patent Laid-Open No. 4-37110 (FIG. 1 etc.) JP-A-62-68225 (FIG. 1 etc.) JP 54-2140 (Fig. 3 etc.)

On the other hand, in the capacitors disclosed in Patent Documents 1 to 5, since the length of the auxiliary terminal is sufficiently longer than the diameter of the capacitor body, the auxiliary terminal becomes an obstacle when the capacitor is manufactured. In other words, the handleability of the capacitor or its intermediate product is very poor in manufacturing. For this reason, as a result, the automation of the production line is hindered.

In addition to this, when attempting to remodel a capacitor production line that does not have an auxiliary terminal into a capacitor production line with an auxiliary terminal, it is necessary to review it significantly in consideration of the presence of the auxiliary terminal. That is, in terms of productivity, compatibility with an existing capacitor production line without auxiliary terminals is extremely low, and therefore, modification of the production line requires a great deal of modification and cost.

The present invention has been made in view of the above circumstances, and is excellent in handling of an intermediate product of a capacitor in production, and when manufacturing using an existing manufacturing line, the manufacturing line can be easily changed. It is an object to provide a capacitor, a manufacturing method thereof, and a circuit board with the capacitor.

The object is achieved by the present invention described below. That is,
The capacitor of the present invention has at least a columnar capacitor body having two electrode terminals on one end surface and a columnar convex portion on the other end surface, and a fixing auxiliary terminal attached to the capacitor body. and, fixing the auxiliary terminals, while pressing the outer peripheral surface of the projection from more than one direction substantially perpendicular to the central axis of the convex portion, and the crimped member which is crimped against the protrusion, And at least a rod-like member connected to the crimping fixing member.

In one embodiment of the capacitor of the present invention, it is preferable that the crimping fixing member is a hollow member selected from a ring-shaped member, a cylindrical member, and a coil-shaped member.

In another embodiment of the capacitor of the present invention, the hollow member is made of a ring-shaped member, and the ring-shaped member is formed so that the inner diameter direction of the opening of the ring-shaped member and the axial direction of the rod-shaped member are substantially parallel to each other. A rod-shaped member is connected to the outer edge, and the rod-shaped member is arranged so that the central axis thereof is substantially orthogonal to a straight line connecting two points where two electrode terminals intersect one end surface. It is preferable that the ring-shaped member is pressure-bonded and fixed to the convex portion in a state where the convex portion is inserted into the opening of the ring-shaped member.

In another embodiment of the capacitor of the present invention, it is preferable that a burring portion extending along the inner edge side of the ring-shaped member so as to be substantially parallel to the axial direction of the opening is provided.

In another embodiment of the capacitor of the present invention, the burring portion is preferably divided into two or more along the circumferential direction of the opening.

In another embodiment of the capacitor of the present invention, the burring portion is preferably divided into four along the circumferential direction of the opening.

In another embodiment of the capacitor of the present invention, the hollow member is formed of a bottomed tubular member, and the axial direction of the tubular member and the axial direction of the rod-shaped member are substantially coincident with each other. It is preferable that a rod-shaped member is connected to the outer surface, and the cylindrical member is pressure-bonded and fixed to the convex portion in a state where the convex portion is inserted into the cylindrical member.

In another embodiment of the capacitor of the present invention, the crimping fixing member is a convex holding member selected from a semi-ring-shaped member and a semi-cylindrical member, and the convex portion is disposed on the inner peripheral side of the convex holding member. In this state, it is preferable that the convex portion holding member is pressure-bonded and fixed to the convex portion.

According to another embodiment of the capacitor of the present invention, the capacitor body includes a capacitor element, two electrode terminals connected to the capacitor element, a bottomed cylindrical case for housing the capacitor element, and the cylindrical case. It is preferable that at least a convex portion provided so as to protrude outside the bottom surface is provided, and the cylindrical case and the convex portion are integrally formed.

Another embodiment of the capacitor of the present invention preferably satisfies the following formula (1).
Formula (1) 0 <Hp ≦ DC / 1.5
[In Formula (1), Hp represents the height (mm) of a convex part, and DC represents the diameter (mm) of a capacitor | condenser main body. ]

It is preferable that the other embodiment of the capacitor of the present invention satisfies the following formula (2).
Formula (2) DC / 20 ≦ Dp <DC
[In Formula (2), Dp represents the diameter (mm) of a convex part, and DC represents the diameter (mm) of a capacitor | condenser main body. ]

In another embodiment of the capacitor of the present invention, the ratio of the length to the diameter of the capacitor body is preferably 1.2 or more.

The capacitor manufacturing method of the present invention includes a columnar capacitor body having two electrode terminals on one end surface and a convex portion on the other end surface, and two or more substantially orthogonal to the central axis of the convex portion. By pressing the outer peripheral surface of the convex part from the direction of, using a crimping fixing member that can be crimped and fixed to the convex part, and a fixing auxiliary terminal having a rod-like member connected to the crimping fixing member, By arranging the crimping fixing member against the projection so that the outer peripheral surface of the projection can be pressed from two or more directions substantially orthogonal to the central axis of the projection, by crimping the crimping fixing member, The capacitor of the present invention is manufactured through at least a fixing auxiliary terminal attaching step for attaching the fixing auxiliary terminal to the capacitor body.

In one embodiment of the method for producing a capacitor of the present invention, the crimping fixing member is a hollow member selected from a ring-shaped member, a cylindrical member, and a coil-shaped member, and the fixing auxiliary terminal mounting step is a hollow hollow member. It is preferable to carry out by caulking the hollow member with the convex portion inserted into the portion.

The substrate with circuit of the present invention includes at least a substrate having three or more through holes penetrating in the thickness direction and the capacitor of the present invention, and two electrode terminals and rod-shaped members are formed from three or more through holes. The capacitor is fixed to the substrate while being inserted into any three of the selected through holes.

According to the present invention, in terms of manufacturing, when handling an intermediate product of a capacitor, and manufacturing using an existing manufacturing line, the capacitor can be easily changed, a manufacturing method thereof, and the A substrate with a circuit using a capacitor can be provided.

It is a schematic diagram which shows an example of the capacitor | condenser of this embodiment. Here, FIG. 1A is a side view of the capacitor viewed from the side surface side, FIG. 1B is a top view of the capacitor viewed from the top surface side, and FIG. It is the front view seen from the end surface side to which the auxiliary terminal for fixation was attached. It is a schematic diagram which shows the auxiliary terminal for fixation used for the capacitor | condenser shown in FIG. It is a schematic diagram which shows the other 1st example of the auxiliary terminal for fixation. It is a schematic diagram which shows the other 2nd example of the auxiliary terminal for fixation. It is a schematic diagram which shows the other 3rd example of the auxiliary terminal for fixation. It is a schematic diagram which shows the other 1st example of the capacitor | condenser of this embodiment, and is a schematic diagram which shows the other 4th example of the auxiliary terminal for fixation. Here, FIG. 6A is a side view of the capacitor viewed from the side, and FIG. 6B is a cross-sectional view of the capacitor. It is a schematic diagram which shows the other 2nd example of the capacitor | condenser of this embodiment, and is a schematic diagram which shows the other 5th example of the auxiliary terminal for fixation. Here, FIG. 7A is a side view of the capacitor viewed from the side, FIG. 7B is a top view of the capacitor viewed from the top, and FIG. It is the front view seen from the end surface side to which the auxiliary terminal for fixation was attached. It is a schematic diagram which shows the other 6th example of the auxiliary terminal for fixation. It is a schematic diagram which shows the other 7th example of the auxiliary terminal for fixation. It is a schematic diagram which shows the other 8th example of the auxiliary terminal for fixation. It is a schematic cross section showing an example of a cross-sectional structure of the capacitor body. It is a schematic diagram which shows an example of the board | substrate with a circuit of this embodiment. Here, FIG. 12 (A) shows a cross-sectional view of the capacitor body as viewed from the side, FIG. 12 (B) shows a cross-sectional view as seen from one end surface side of the capacitor body, and FIG. Sectional drawing seen from the other end surface side of the capacitor | condenser main body is shown.

(Capacitor)
The capacitor of this embodiment has at least two column terminals on one end surface and a columnar capacitor body having a columnar protrusion on the other end surface, and a fixing auxiliary terminal attached to the capacitor body. Have. Here, the fixing auxiliary terminals, while pressing the outer peripheral surface of the projection from more than one direction substantially perpendicular to the central axis of the convex portion, and the crimped member which is crimped against the protrusion And a bar-shaped member connected to the crimping fixing member.

Here, the fixing auxiliary terminal has a crimping fixing member and a rod-like member connected to the crimping fixing member. Here, the crimping fixing member can realize a function of crimping and fixing to the convex part in a state where the outer peripheral surface of the convex part is pressed from two or more directions substantially orthogonal to the central axis of the convex part. For example, the structure of the crimping fixing member is not particularly limited.

However, the crimping fixing member is preferably a hollow member selected from, for example, a ring-shaped member, a cylindrical member, and a coil-shaped member. In this case, if the hollow member is caulked in a state where the convex portion is inserted into the hollow portion of the hollow member, the inner peripheral surface of the hollow member is from two or more directions substantially orthogonal to the central axis of the convex portion. The outer peripheral surface of the convex portion is pressed. For this reason, a hollow member can be pressure-bonded and fixed to a convex part. In addition to this, since the entire outer circumference of the convex portion is completely surrounded by the hollow member, the fixing auxiliary terminal attached to the capacitor body is difficult to drop off.

In the present specification, “two or more directions substantially orthogonal to the central axis of the convex portion” are orthogonal to the central axis of the convex portion among two or more vectors in each direction. It means that the component in the plane (orthogonal component) is substantially point symmetric with respect to the central axis of the convex portion. For example, when the outer peripheral surface of the convex portion is pressed from two different directions by caulking the hollow member from two directions, one direction is a direction of 0 degrees with respect to the central axis of the convex portion, and the other The direction of can be a direction of about 180 ° ± 20 ° with respect to the central axis of the convex portion. Further, when the outer peripheral surface of the convex portion is pressed from three different directions by caulking the hollow member from three directions, the first direction is a direction of 0 degree with respect to the central axis of the convex portion, The second direction is about 120 ° ± 20 ° with respect to the central axis of the convex portion, and the third direction is about 240 ° ± 20 ° with respect to the central axis of the convex portion. it can. In addition, the central axis of the convex portion is basically shown as a point in the cross section of the convex portion, but when the cross sectional shape of the convex portion is vertically long, an area similar to this cross sectional shape. It is shown as An example of such a vertically long cross-sectional shape is a rectangle having a ratio of the long side length to the short side length (long side length / short side length) of about 3 or more. On the other hand, the angle formed by a vector in each of two or more directions with respect to a plane orthogonal to the central axis of the convex portion may be within a range of about 0 ° ± 30 °, and is 0 ° ± 15 °. Within the range of the degree is preferable, and closer to 0 degree is more preferable.

The crimp fixing member may be a convex holding member selected from a semi-ring member and a semi-cylindrical member. In this case, if the convex portion holding member is caulked in a state where the convex portion is disposed on the inner peripheral side of the convex portion holding member, the inner peripheral surface of the convex portion holding member is substantially orthogonal to the central axis of the convex portion. In order to press the outer peripheral surface of the convex portion from two or more directions, the hollow member can be crimped and fixed to the convex portion. In addition, when the crimping fixing member is a convex holding member, the entire circumference of the convex portion in the outer peripheral direction is not completely surrounded by the hollow member, so that it is attached to the capacitor body as compared with the case where the hollow member is used as the crimping fixing member. The fixing auxiliary terminal may easily fall off. In order to prevent such a problem, the convex portion holding member can be crimped and fixed to the convex portion by caulking the convex portion holding member more strongly than in the case where a hollow member is used as the pressure fixing member. preferable.

In addition, the convex portion holding member is convex with respect to the outer peripheral surface of the convex portion in the outer peripheral length direction of the convex portion in a state after being crimped and fixed to the convex portion by caulking the convex portion holding member. As a general rule, it is preferable that the ratio (opposite ratio) of the regions where the inner peripheral surfaces of the portion holding members face each other exceeds 50% of the total outer peripheral length of the convex portion. More precisely, the facing ratio is a value obtained as a ratio of the length of the convex portion holding member in the inner peripheral direction with reference to the length of the convex portion in the outer peripheral direction. Here, at the part where the outer peripheral surface of the convex portion and the inner peripheral surface of the convex portion holding member are opposed, at least a part of the outer peripheral surface of the convex portion and the inner peripheral surface of the convex portion holding member may be in contact with each other. However, the entire surface is preferably in contact.

Further, by setting the facing ratio to exceed 50%, the convex portion holding member is caulked so as to press the outer peripheral surface of the convex portion from two or more directions substantially orthogonal to the central axis of the convex portion. This is because it becomes very easy to press-fix the convex portion holding member to the convex portion. The facing ratio is more preferably 75% or more, and further preferably 90% or more. However, when the cross-sectional shape of the convex portion is a vertically long shape, for example, when the cross-sectional shape of the convex portion is a vertically long rectangle, the facing ratio may be 50% or less. On the other hand, the upper limit of the facing ratio is less than 100%.

As described above, a ring-shaped member, a cylindrical member, a coil-shaped member, a semi-ring-shaped member, a semi-cylindrical member, or the like can be used as the crimping fixing member. Here, the cylindrical member and the semi-cylindrical member mean a crimping fixing member having a ratio of the axial length to the maximum outer diameter of 0.5 or more, and the ring-shaped member and the semi-ring-shaped member are the maximum It means a crimping fixing member having a ratio of an axial length to an outer diameter (an axial length not including the length of a burring portion described later) of less than 0.5. In addition, the coil-shaped member can set the axial direction length with respect to the maximum outer diameter arbitrarily by the number of windings.

Moreover, the auxiliary terminal for fixing may be a crimping fixing member and a bar-shaped member which are separately manufactured and connected to each other by welding, bonding, fitting, etc., and the crimping fixing member and the bar-shaped member are integrally formed. It may be what was done. For example, when the crimping fixing member is a ring-shaped member, a fixing auxiliary terminal in which the ring-shaped member and the rod-shaped member are integrally formed can be manufactured by using a punching process or the like of a single metal plate. Further, when the crimping fixing member is a coil-shaped member, a fixing auxiliary terminal in which the coil-shaped member and the rod-shaped member are integrally formed is produced by winding one end of one metal wire in a coil shape. it can.

In addition, the rod-shaped member can be inserted into a through hole provided in the substrate and fixed by soldering when the capacitor body is fixed on the substrate so that the axial direction thereof is substantially parallel to the substrate surface. It is sufficient if the member has a length of. From this point of view, for example, when the convex portion is arranged near the center of the end face of the capacitor body, the length of the rod-shaped member is a value obtained by dividing the thickness of the substrate and the diameter of the capacitor body by two. It can be set to a value that is the same as or greater than the value obtained by adding. The “diameter of the capacitor body” here means the maximum diameter of the capacitor body in a direction orthogonal to the substrate surface in a state where the capacitor is arranged on the substrate so as to be parallel to the substrate surface.

Next, when the crimping fixing member is a hollow member, (I) a capacitor using a fixing auxiliary terminal in which the hollow member is a ring-shaped member, and (II) a fixing auxiliary terminal in which the hollow member is a cylindrical member The capacitor used and (III) the capacitor using the fixing auxiliary terminal whose hollow member is a coil-shaped member will be described in more detail with reference to the drawings.

First, (I) a capacitor using a fixing auxiliary terminal whose hollow member is a ring-shaped member, and a fixing auxiliary terminal used therefor will be described with reference to the drawings. FIG. 1 is a schematic diagram illustrating an example of a capacitor according to the present embodiment. FIG. 1A is a side view of the capacitor viewed from the side, and FIG. FIG. 1C is a top view, and FIG. 1C is a front view of the capacitor as viewed from the end surface side to which the fixing auxiliary terminal is attached. 1A corresponds to FIG. 1B, and the view seen from the arrow E direction in FIG. 1A corresponds to FIG. 1C.

A capacitor 10A (10) shown in FIG. 1 includes a substantially cylindrical capacitor body 20 and a fixing auxiliary terminal 30A (30). Two electrode terminals (lead wires 24A and 24B) are provided on one end surface 22A of the capacitor body 20, and a convex portion 26 is provided on the other end surface 22B. The two lead wires 24A and 24B are substantially orthogonal to the end face 22A and the central axis C1 of the capacitor body 20 (a straight line C1 indicated by a one-dot chain line in FIGS. 1A and 1B). They are arranged substantially symmetrical with respect to the central axis C1 so as to be substantially parallel. One end of each of the lead wire 24 </ b> A and the lead wire 24 </ b> B is electrically connected to a capacitor element (not shown) disposed in the capacitor main body 20. The convex portion 26 is a substantially columnar member provided so as to protrude from the end surface 22 </ b> B, and the end surface so that the axial center line of the convex portion 26 substantially coincides with the central axis C <b> 1 of the capacitor body 20. 22B. The electrode terminal is not limited to the lead wire illustrated in FIG. 1, and any electrode terminal may be used as long as it is a known electrode terminal that can be used as an electrode terminal for a capacitor.

The fixing auxiliary terminal 30A (30) includes a concentric ring-shaped member 32A (32) and a rod-shaped member 34. Then, the opening surface of the opening (hollow part) 36 of the ring-shaped member 32A and the axial center line C2 of the rod-shaped member 34 (a straight line C2 indicated by a one-dot chain line in FIGS. 1 (A) and 1 (C)). Are connected to the outer edge of the ring-shaped member 32 </ b> A so that they are parallel to each other. Here, the bar-shaped member 34 has a central axis C2 between the two points where the two lead wires 24A, 24B and the end face 22A intersect (in FIG. 1 (B) and FIG. 1 (C), They are arranged so as to be substantially orthogonal to a straight line L) indicated by a dotted line. The ring-shaped member 32 </ b> A is pressure-bonded to the convex portion 26 in a state where the convex portion 26 is inserted into the opening 36 of the ring-shaped member 32 </ b> A. Thereby, the fixing auxiliary terminal 30 </ b> A is attached to the capacitor body 20. By arranging the rod-shaped member 34 in this manner, the two lead wires 24A and 24B are bent toward the side where the rod-shaped member 34 is provided so as to be substantially parallel to the central axis C2 of the rod-shaped member 34. In the figure, it is extremely easy to solder after inserting the lead wires 24A, 24B and the rod-shaped member 34 into the through holes of the substrate (not shown). The fixing auxiliary terminal 30A can be attached to the capacitor body 20 by caulking the ring-shaped member 32A from two or three directions substantially orthogonal to the central axis C1 of the convex portion 26, for example. . In this embodiment, the ring-shaped member 32A and the rod-shaped member 34 are integrally configured to form one member.

FIG. 2 is a schematic diagram (front view) showing an auxiliary terminal for fixing used in the capacitor 10A shown in FIG. 1. Specifically, the auxiliary auxiliary terminal 30A constituting the capacitor 10A shown in FIG. FIG. 6 is a view showing a state before being attached to a convex portion 26 of the capacitor body 20. As shown in FIG. 2, the ring-shaped member 32 </ b> A is provided with a split (gap 38) that divides a portion on the side opposite to the portion to which the rod-shaped member 34 is connected along the central axis C <b> 2. Here, when attaching the fixing auxiliary terminal 30 </ b> A to the capacitor body 20, the ring-shaped member 32 </ b> A is inserted into the inner diameter of the opening 36 so that the gap 38 is substantially eliminated after the protrusion 26 is inserted into the opening 36. Caulking so as to be pressed from both sides (for example, the direction of arrow F1 in FIG. 2) with respect to the direction. The gap 38 that divides a part of the ring-shaped member 32A along the radial direction of the opening 36 can be provided at any position other than the portion where the rod-shaped member 34 of the ring-shaped member 32A is connected. However, from the viewpoint of facilitating the caulking operation, as shown in FIG. 2, it is preferable to provide a gap 38 in a portion of the ring-shaped member 32A opposite to the portion where the rod-shaped member 34 is connected. Further, if it is easy to caulk, instead of the ring-shaped member 32A having the gap 38, as shown in FIG. 3, the fixing aid provided with the ring-shaped member 32B (30) having no gap 38 is used. The terminal 30B (30) may be used. The fixing auxiliary terminal 30B shown in FIG. 3 is a member having the same configuration as the fixing auxiliary terminal 30A shown in FIG. 2 except that the gap 38 is not provided.

Further, the shape and size of the opening 36 before the fixing auxiliary terminal 30 is attached to the capacitor body 20 can be inserted into the convex portion 26, and the caulking auxiliary terminal 30 can be easily removed from the convex portion 26 after caulking. If it is a grade which does not carry out, it will not specifically limit. The shape of the opening 36 can be appropriately selected according to the cross-sectional shape of the convex portion 26, but is preferably the same as or similar to the cross-sectional shape of the convex portion 26. Further, the shape along the outer edge of the ring-shaped member 32 may be an ellipse or a polygon other than the circle illustrated in FIGS. 1 and 2. The shape along the outer edge of the ring-shaped member 32 can be appropriately selected according to the shape of the jig used for the caulking work. On the other hand, the cross-sectional shape of the convex portion 26 can be selected from any shape such as an ellipse or a polygon other than the circular shape shown in FIG. 1, but the auxiliary auxiliary terminal 30 provided with the ring-shaped member 30 is used. In this case, a circular shape is particularly preferable. This reason will be described later.

In the fixing auxiliary terminal 30A in which the hollow member illustrated in FIG. 2 is configured by the ring-shaped member 32A, the fixing auxiliary terminal 30A can be easily manufactured, and the rod-shaped member 34 to the through hole provided in the substrate is used. In view of facilitating insertion of the ring-shaped member 32A, the thickness of the ring-shaped member 32A and the thickness of the rod-shaped member 34 are preferably the same. Further, when the fixing auxiliary terminal 30A is manufactured by using a general metal processing method such as punching of a known metal plate such as a stainless plate or an aluminum plate, the thickness of the ring-shaped member 32A and the rod-shaped member 34 is increased. Is generally preferably in the range of about 0.3 mm to 2 mm. However, if the thickness is within the above range, the contact area between the inner peripheral surface of the ring-shaped member 32A and the outer peripheral surface of the convex portion 26 is too small, so that fixing of the auxiliary terminal 30A for fixing to the convex portion 26 becomes unstable. In some cases, the fixing auxiliary terminal 30 </ b> A may easily fall off from the convex portion 26.

From the viewpoint of suppressing such a problem, for example, the burring portion 40 as in the fixing auxiliary terminal 30C (30) illustrated in FIG. 4 or the fixing auxiliary terminal 30D (30) illustrated in FIG. It is preferable to use an auxiliary terminal for fixing provided with.

Here, FIG. 4 is a schematic view showing another example of the fixing auxiliary terminal, FIG. 4 (A) is a front view of the fixing auxiliary terminal 30C, and FIG. 4 (B) is an auxiliary fixing terminal. It is a side view of terminal 30C. The auxiliary terminal for fixing 30C (30) shown in FIG. 4 is formed along the inner edge side of the ring-shaped member 32C (32) along the axial center line C3 of the opening 36 (two dashed lines in FIG. 4A). A ring-shaped burring portion 40A (40) extending so as to be substantially parallel to the intersection C3 and the one-dot chain line C3 in FIG. 4B is provided. The fixing auxiliary terminal 30C shown in FIG. 4 is a member having the same configuration as the fixing auxiliary terminal 30B shown in FIG. 3 except that the fixing auxiliary terminal 30C has a burring portion 40A. Here, the burring portion 40 </ b> A shown in FIG. 4 is formed in a crown shape having four apexes in the circumferential direction of the opening 36, and is equally divided into four in the circumferential direction of the opening 36.

FIG. 5 is a schematic diagram showing another example of the fixing auxiliary terminal, FIG. 5A is a front view of the fixing auxiliary terminal 30D, and FIG. 5B is a diagram of the fixing auxiliary terminal 30D. It is a side view. The auxiliary terminal for fixing 30D (30) shown in FIG. 5 is formed along the inner edge side of the ring-shaped member 32D (32) along the axial center line C4 of the opening 36 (two dashed lines in FIG. 5A). A ring-shaped burring portion 40B (40) extending so as to be substantially parallel to the intersection C4 and the one-dot chain line C4) in FIG. The fixing auxiliary terminal 30D shown in FIG. 5 is a member having the same configuration as the fixing auxiliary terminal 30B shown in FIG. 3 except that the fixing auxiliary terminal 30D has a burring portion 40B. Here, the burring portion 40B shown in FIG. 5 is formed in a ring shape having a constant height in the circumferential direction of the opening 36, and is continuous in the circumferential direction of the opening 36, that is, divided in the circumferential direction of the opening 36. It is formed without being.

When the fixing auxiliary terminal 30C having the burring portion 40A (40) shown in FIG. 4 or the fixing auxiliary terminal 30D having the burring portion 40B (40) shown in FIG. The outer peripheral surface of the convex portion 26 is supported by the burring portion 40 extending along the axial center line C1. For this reason, it becomes easy to suppress dropping of auxiliary terminal 30C for fixation from convex part 26.

The burring portion 40 may be provided continuously without being divided in the circumferential direction of the opening 36 as illustrated in FIG. 5, but the circumferential direction of the opening 36 as illustrated in FIG. It is preferable that it is divided | segmented into 2 or more along. In the latter case, the effect of further suppressing the dropout of the fixing auxiliary terminal 30C from the convex portion 26 is improved. Further, from the same viewpoint, the burring portion 40 is preferably divided into four as shown in FIG. 4, and when dividing into two or more, the burring portion 40 is circumferentially arranged as shown in FIG. It is preferable to divide evenly.

Note that the burring portion 40A shown in FIG. 4 is a columnar die having a quadrangular pyramid tip at the intersection of two cutting lines having a cross shape provided in the planar direction of the metal plate. The metal plate can be formed by burring by pressing so that the intersection of the cutting lines and the axial center of the mold coincide with each other. As a result, a crown-shaped burring portion 40A having four vertices in the circumferential direction is formed. On the other hand, the burring portion 40B shown in FIG. 5 is configured such that, for example, a cylindrical mold having a shape similar to the hole and slightly larger than the hole is formed on a metal plate that has been previously perforated. The metal plate can be formed by burring by pressing so that the central axis and the central axis of the mold coincide with each other. As a result, a burring portion 40B having a ring shape with a constant circumferential height is formed.

Further, the maximum height Bh of the burring portion 40 is not particularly limited, but from the viewpoint of improving the fixing force of the fixing auxiliary terminal 30C or the fixing auxiliary terminal 30D with respect to the convex portion 26, the ring-shaped members 32C and 32D. The thickness t is preferably 1 times or more, and more preferably 1.5 times or more the thickness t of the ring-shaped members 32C and 32D. On the other hand, although the upper limit of the maximum height Bh is not particularly limited, the maximum height Bh is a ring-shaped member from a practical point of view such that it is difficult to form the burring portion 40 having the predetermined maximum height Bh. The thickness is preferably 5 times or less of the thickness t of 32C and 32D.

The burring portion 40 can be formed by burring as described above, but may be formed by a method other than burring as long as the function as the burring portion 40 is obtained. For example, a ring-shaped member is fitted and fixed on the inner peripheral side of the ring-shaped member 32B shown in FIG. 3, thereby forming a burring portion having substantially the same function as the burring portion 40B illustrated in FIG. can do.

Next, (II) a capacitor using a fixing auxiliary terminal whose hollow member is a cylindrical member, and a fixing auxiliary terminal used therefor will be described with reference to the drawings. FIG. 6 is a schematic diagram illustrating another example of the capacitor according to the present embodiment, and is a diagram illustrating a structure in the vicinity of the convex portion provided on the end face of the capacitor body. Here, FIG. 6A is a side view of the capacitor viewed from the side, and FIG. 6B is a cross-sectional view of the capacitor (a cross-sectional view cut along a plane including the axial direction of the convex portion). . In FIG. 6B, the details of the cross-sectional structure inside the capacitor body are omitted.

A capacitor 10B (10) shown in FIG. 6 includes a capacitor body 20 similar to that illustrated in FIG. 1 and an auxiliary terminal 50 for fixing. Here, the fixing auxiliary terminal 50 includes a bottomed tubular member 52 and a rod-like member 54 connected to the outer surface of the bottom portion 52B of the tubular member 52. The rod-shaped member 54 is connected to the bottom portion 52B of the tubular member 52 so that the axial direction of the tubular member 52 and the axial direction of the rod-shaped member 54 coincide with each other as indicated by a one-dot chain line C5 in the drawing. Has been. In addition, the central axis of the cylindrical member 52 and the rod-shaped member 54 is also in agreement with the central axis of the convex part 26 and the capacitor | condenser main body 20 in the example shown in FIG. Here, the fixing auxiliary terminal 50 is attached to the capacitor body 20 by applying a force from both sides of the cylindrical member 52 (for example, in the direction of arrow F2 in FIG. 6). When the capacitor 10B is attached to the substrate with the circuit, the two lead wires 24A and 24B (not shown in FIG. 6) and the three rod-shaped members 54 are both bent in the same direction. Then, it is inserted into the through hole of the substrate and soldered.

Note that the cylindrical member 52 may be provided with a split for dividing the cylindrical portion of the cylindrical member 52 in the circumferential direction, similarly to the fixing auxiliary terminal 30A illustrated in FIG. Further, the rod-shaped member 54 may be connected to the outer peripheral surface of the cylindrical member 52 instead of the bottom portion 52 </ b> B of the cylindrical member 52. In this case, the cylindrical member 52 may not be provided with the bottom 52B. Furthermore, the rod-shaped member 54 may be connected to the cylindrical member 52 so that the central axis of the rod-shaped member 54 and the central axis of the cylindrical member 52B are substantially orthogonal. The cylindrical member 52 can be produced by, for example, pressing a known metal plate such as a stainless steel plate or an aluminum plate, and the rod-shaped member 54 is a known metal plate such as a stainless steel plate or an aluminum plate. A known metal wire such as a lead wire or the like can be used.

Next, (III) a capacitor using a fixing auxiliary terminal whose hollow member is a coiled member, and a fixing auxiliary terminal used therefor will be described with reference to the drawings. FIG. 7 is a schematic diagram illustrating another example of the capacitor of the present embodiment. Here, FIG. 7A is a side view of the capacitor viewed from the side, FIG. 7B is a top view of the capacitor viewed from the top, and FIG. 7C is for fixing the capacitor. It is the front view seen from the end surface side to which the auxiliary terminal was attached. 7A corresponds to FIG. 7B, and the view viewed from the arrow E direction in FIG. 7A corresponds to FIG. 7C.

A capacitor 10C (10) shown in FIG. 7 includes a substantially cylindrical capacitor body 20 similar to that shown in FIGS. 1 and 6, and an auxiliary terminal 60 for fixing. Here, the fixing auxiliary terminal 60 includes a coil-shaped member 62 and a rod-shaped member 64. In the example shown in FIG. 7, the fixing auxiliary terminal 60 has a coiled member 62 and a rod-shaped member 64 integrally formed by winding one end of one metal wire in a circular shape. .

The fixing auxiliary terminal 60 is attached to the capacitor body 20 by caulking the coil-shaped member 62 in a state where the convex portion 26 is inserted into the hollow portion 66 of the coil-shaped member 62. Here, the rod-shaped member 64 has a straight axis L (in FIG. 7B and FIG. 7C) in which the central axis C6 connects the two points where the two lead wires 24A and 24B intersect the end surface 22A. They are arranged so as to be substantially orthogonal to a straight line L) indicated by a dotted line. By arranging the rod-like member 64 in this way, the two lead wires 24A and 24B are bent toward the side where the rod-like member 64 is provided so as to be substantially parallel to the central axis C6 of the rod-like member 64. In the figure, it is extremely easy to solder after inserting the lead wires 24A, 24B and the rod-like member 64 into the through holes of the substrate (not shown).

Note that the number of turns of the coil-shaped member 62 may be at least one or more, but in order to more firmly fix the fixing auxiliary terminal 60 to the convex portion 26, it is preferably two or more times. More preferably, it is 3 times or more. On the other hand, the upper limit of the number of windings is not particularly limited, but is practically 10 or less. Further, when the capacitor 10C is manufactured, the capacitor 26C can be manufactured by inserting the convex portion 26 into the hollow portion 66 of the coil-shaped member 62 and then caulking the coil-shaped member 62. You can also That is, the capacitor 10 </ b> C can also be manufactured by winding one end of a metal wire around the outer peripheral surface of the convex portion 26 to form the coil-shaped member 62 and caulking the coil-shaped member 62. Alternatively, the fixing auxiliary terminal 60 may be attached to the capacitor body 20 by using an elastic force in a direction in which the diameter of the coiled member 62 is reduced.

In the capacitors 10A, 10B, and 10C of this embodiment illustrated in FIG. 1, FIG. 6, and FIG. 7, the auxiliary auxiliary terminals 30, 50, and 60 each including a crimp fixing member made of a hollow member are used. However, in the example shown in FIGS. 1, 6, and 7, instead of the fixing auxiliary terminals 30, 50, 60, a crimp fixing member made of a convex holding member selected from a semi-ring member and a semi-cylindrical member An auxiliary terminal for fixing provided with can also be used. Hereinafter, specific examples of such fixing auxiliary terminals will be described with reference to the drawings.

FIGS. 8 to 10 are schematic views showing other examples of auxiliary terminals for fixing that can be used in the capacitor of this embodiment. Specifically, in a state where they are fixed to the convex portion 26 of the capacitor body 20 by pressure. It is a front view. In any of the drawings, descriptions of the capacitor body 20 other than the convex portions 26 are omitted. Further, the alternate long and short dash line indicated by the symbol X and the alternate long and short dash line indicated by the symbol Y in the drawing are straight lines orthogonal to each other on the central axis C1 of the convex portion 26.

Here, the fixing auxiliary terminal 70A (70) shown in FIG. 8 is a circumferential portion of the ring-shaped member 32B shown in FIG. 3 on the opposite side to the side where the rod-shaped member 34 is connected. It has a half ring-shaped member 72 having a shape cut by about 1/3 of the entire circumference in length and a rod-shaped member 74 connected to the half ring-shaped member 72. The rod-shaped member 74 corresponds to the rod-shaped member 34 shown in FIG. And the convex part 26 is arrange | positioned so that the whole inner peripheral surface of the half ring-shaped member 72 and the outer peripheral surface of the convex part 26 may contact | adhere to the inner peripheral side of this half ring-shaped member 72. Here, in the X-axis direction in the drawing, the half-ring member 72 is crimped and fixed to the convex portion 26 by crimping the half-ring member 72 from both sides (for example, in the direction of arrow F3 in FIG. 8). ing. In the example shown in FIG. 8, the facing ratio exceeds 50%, specifically about 60 to 70%. In addition, when using a semi-cylindrical member as a crimping | fixing fixing member, the cross-sectional shape can use the semi-cylindrical member similar to the ring-shaped member 72 shown in FIG.

The auxiliary auxiliary terminal 70B (70) shown in FIG. 9 has both tip portions 76R instead of the semi-ring-shaped member 72 having a shape lacking a part of the circumferential direction of the concentric ring in the example shown in FIG. , 76L have the same structure except that a V-shaped half ring member 76 bent so as to approach each other is used. The fixing auxiliary terminal 70B is in contact with the inner peripheral surface of the semi-ring-shaped member 76 only on the outer peripheral surface of both side portions of the convex portion 26 in the X-axis direction. In addition, the half ring-shaped member 76 has a complete V-shape in a state before being fixed to the convex portion 26 as shown by a one-dot chain line in FIG. Then, in a state where the convex portion 26 is arranged on the inner peripheral side of the ring-shaped member 76 before being crimped and fixed to the convex portion 26, the half ring-shaped members 72 before the crimping and fixing are arranged on both sides in the X-axis direction in the figure. By caulking, both the end portions 76R and 76L are bent so as to approach each other, and at the same time, the half ring-shaped member 72 is fixed to the convex portion 26 by pressure. In the example shown in FIG. 9, the facing ratio is significantly higher than 50%.

10 has a configuration in which the number of turns of the coil-shaped member 62 constituting the fixing auxiliary terminal 60 shown in FIG. 7 is less than one. Here, in the X-axis direction in the figure, the half-ring member 78 is crimped and fixed to the convex portion 26 by crimping the half-ring member 78 from both sides. In the example shown in FIG. 10, the number of windings is about 0.75 and the facing ratio is about 75%.

As shown in FIGS. 1 to 10, when attaching the fixing auxiliary terminals 30, 50, 60, and 70, caulking is mainly employed as a specific method for crimping and fixing, as described above. Further, it is possible to use an elastic force or use a fitting force or the like. Further, in the fixing auxiliary terminal 30 in which the crimping fixing member is a hollow member, a split (cleavage part) is provided at the tip of the convex part 26, and a rod-like member or a plate-like member is inserted into the cleavage part for fixing. The auxiliary terminal 30 may be attached.

-Capacitor body-
Next, the capacitor body 20 used for the capacitor 10 of the present embodiment will be described. The capacitor body 20 is the same as a conventionally known capacitor except that a columnar convex portion 26 is provided on an end surface 22B opposite to the end surface 22A on the side where the two lead wires 24A and 24B are provided. Is available.

Similar to the conventional capacitor, the capacitor body 20 usually has at least a capacitor element, two lead wires 24A and 24B connected to the capacitor element, and a bottomed cylindrical case for storing the capacitor element. . Further, the capacitor body 20 is provided with a convex portion 26 so as to protrude outside the bottom surface of the cylindrical case. Here, although the convex part 26 can also be arrange | positioned using welding or adhesion | attachment with respect to the bottom face of a cylindrical case, it is especially that the cylindrical case and the convex part 26 are integrally molded. preferable.

The reason for this is that when the convex portion 26 is attached to the capacitor main body 20 in a state where the portions other than the convex portion 26 are substantially completed, a pressing force is applied in the axial direction of the capacitor main body 20. It is to become. That is, in this case, pressure is applied to the capacitor element housed in the capacitor body 20, and variations and the like tend to occur in the electrical characteristics of the capacitor 10. Furthermore, if the cylindrical case and the convex portion 26 are integrally formed, the process of attaching the convex portion 26 can be omitted when the capacitor 10 is manufactured.

FIG. 11 is a schematic cross-sectional view showing an example of a cross-sectional structure of a capacitor main body used in the capacitor of this embodiment. Specifically, the cross-sectional structure of the capacitor main body 20 shown in FIGS. 1, 6 and 7 is shown. Is. FIG. 11 shows the cross-sectional structure of the capacitor body 20 on the side where the convex portions 26 are provided, and the description of the cross-sectional structure on the side where the lead wires 24A and 24B are provided is omitted.

In the example shown in FIG. 11, the capacitor body 20 has a capacitor element 82 housed in a bottomed cylindrical case 80. A cylindrical convex portion 26 formed integrally with the cylindrical case 80 is provided on the outer surface of the bottom portion 80B of the cylindrical case 80, that is, the circular end surface 22B. The structure of the capacitor element 82 is appropriately selected according to the type of capacitor. For example, when the capacitor 10 of the present embodiment is an electrolytic capacitor, the capacitor element 82 is configured by winding a laminated sheet in which an anode foil, electrolytic paper, and a cathode foil are laminated in this order. Here, the anode foil has an aluminum oxide film functioning as a dielectric on the surface of the roughened aluminum foil. The cathode foil is made of an aluminum foil. The electrolytic paper is a paper base material impregnated with an electrolytic solution using an organic solvent, and prevents the anode foil and the cathode foil from contacting each other. In addition, two lead wires 24A and 24B are electrically connected to the capacitor element 82, one lead wire 24A is connected to the anode foil, and the other lead wire 24B is connected to the cathode foil. . Moreover, the cylindrical case 80 is normally comprised from metals, such as aluminum, and can be integrally formed with the convex part 26 by pressing a metal plate.

Here, as the cross-sectional shape of the convex portion 26, any shape other than the circular shape shown in FIG. 1 can be selected. However, the rod-shaped members 34, 64, and 74 are fixed to the convex portion 26 so that the rod-shaped members 34, 64, and 74 are substantially orthogonal to the axial center line C1 of the convex portion 26 illustrated in FIGS. 1 to 5 and FIGS. In the case of using the fixing auxiliary terminals 30, 60, 70, it is particularly preferable that the cross-sectional shape of the convex portion 26 is circular.

The reason for this is as follows. First, after assembling the capacitor 10 of the present embodiment other than that shown in FIG. 6 by using the fixing auxiliary terminals 30, 60 and 70 illustrated in FIGS. 1 to 5 and FIGS. In order to attach the capacitor 10 to a substrate having holes, it is necessary to bend the two lead wires 24A and 24B so as to be substantially orthogonal to a plane including the straight line L and the axial center line C1. In this case, if the cross-sectional shape of the convex portion 26 is circular, that is, isotropic with point symmetry with respect to the central axis C1 of the convex portion 26, the orientation of the rod-shaped members 34, 64, 74 is It can be arbitrarily adjusted in the range of 0 degrees to 360 degrees with respect to the axis C1. For this reason, it is extremely easy to attach the fixing auxiliary terminals 30, 60, 70 to the capacitor body 20 so that the orientation of the rod-shaped members 34, 64, 74 matches the bending direction of the two lead wires 24 A, 24 B. is there.

On the other hand, if the cross-sectional shape of the convex portion 26 is a shape other than a circle, that is, an anisotropic shape that is asymmetric with respect to the central axis C <b> 1 of the convex portion 26, the rod-shaped members 34, 64, 74 are used. Tends to be adjusted only within a predetermined angle range with respect to the central axis C1. In this case, when assembling the circuit board, the cross-sectional shape of the convex portion 26 is taken into consideration so that the direction of the rod-shaped members 34, 64, 74 is aligned with the direction of the two bent leads 24A, 24B. It is necessary to produce the capacitor body 20 so that the two lead wires 24A and 24B are arranged at predetermined positions. For this reason, the manufacturing process of the capacitor body 20 may be complicated. From the above, when the fixing auxiliary terminals 30, 60, 70 are used, it is preferable that the cross-sectional shape of the convex portion 26 is a circular shape.

The cylindrical case 80 can be provided with a safety valve on the outer peripheral surface or the end surface 22B as necessary. As a result, when the internal pressure of the capacitor body 20 rises due to failure of the capacitor 10 and evaporation of the electrolyte, the safety valve opens when the internal pressure exceeds a predetermined threshold value, thereby preventing the capacitor 10 from being significantly damaged. Can do. Here, when providing a safety valve on the end face 22B, it is preferable to arrange two or more so as to be substantially point-symmetric with respect to the central axis of the convex portion 26. Thereby, it can suppress that the inclination with respect to the end surface 22B of the convex part 26 by formation of a safety valve arises compared with the case where only one safety valve is provided in the end surface 22B. In addition to this, in the circuit board with the capacitor 10 attached thereto, the direction in which gas is released from the safety valve can always be limited to a direction substantially parallel to the substrate surface. For this reason, for example, in an electronic device in which a circuit board is built in the housing, it becomes easy to keep the gas released from the safety valve when the capacitor 10 fails in the electronic device.

Moreover, if it arrange | positions on the end surface 22B, the convex part 26 can be arrange | positioned in the arbitrary positions of the end surface 22B. However, normally, the convex portion 26 is disposed on the end surface 22B so that the central axis of the capacitor body 20, that is, the central axis of the cylindrical case 80, and the axial center line C1 of the convex portion 26 substantially coincide with each other. It is preferable.

Although the height of the convex part 26 should just be a height which can attach the auxiliary terminal for fixation, specifically, it is preferable to satisfy the following formula (1).
Formula (1) 0 <Hp ≦ DC / 1.5

Here, in Formula (1), Hp represents the height (mm) of the convex part 26, and DC represents the diameter (mm) of the capacitor body 20. By setting the height Hp to be equal to or less than the diameter DC / 1.5 of the capacitor main body 20, the length of the capacitor main body 20 can be made very compact as compared with a conventional capacitor with an auxiliary terminal. For this reason, when manufacturing the capacitor body 20 or an intermediate product thereof, the handling becomes extremely easy as compared with a conventional capacitor with an auxiliary terminal. In addition to this, it is very easy to manufacture the capacitor 10 of the present embodiment by making a slight modification to the existing production line for capacitors without auxiliary terminals, or substantially without any modification. It becomes. The height Hp is more preferably within the range of DC / 1 to DC / 1.5.

In addition, the diameter of the convex portion 26 is not particularly limited as long as the fixing auxiliary terminals 30, 50, 60, and 70 are crimped and fixed to the convex portion 26, so long as the strength can be secured so that the convex portion 26 does not bend significantly. Specifically, it is preferable to satisfy the following formula (2).
Formula (2) DC / 20 ≦ Dp <DC

Here, in Formula (2), Dp represents the diameter (mm) of the convex part 26, and DC represents the diameter (mm) of the capacitor | condenser main body 20. FIG. By setting the diameter Dp of the convex portion 26 to be equal to or larger than the diameter DC / 20 of the capacitor body 20, an appropriate strength can be ensured. On the other hand, the diameter Dp is less than the diameter DC of the capacitor body 20 from the practical viewpoint of preventing a significant gap from being generated between the substrate and the capacitor 10 when the capacitor 10 of the present embodiment is attached to the substrate. It is preferable. The diameter Dp of the convex portion 26 is more preferably in the range of DC / 20 to DC / 2, and further preferably in the range of DC / 20 to DC / 2. However, in order to ensure sufficient strength, the absolute value of the diameter Dp is usually preferably in the range of 1 mm to 4 mm.

When the cross-sectional shape of the convex portion 26 and the cross-sectional shape of the capacitor body 20 are other than a circle, the diameter Dp and the diameter DC of the capacitor body 20 are in a circle having the same cross-sectional area as the cross-sectional area of the cross-sectional shape other than the circle. Means diameter.

Also, in the case of vertically long capacitors, there is a growing need for mounting the capacitors on the substrate so that the axial direction of the capacitors is substantially parallel to the substrate surface for the purpose of space saving. Considering this point, the ratio of the length L to the diameter DC of the capacitor body 20 (L / DC) is preferably 1.2 or more, and more preferably 1.5 or more. On the other hand, the upper limit of the ratio (L / DC) is not particularly limited, but is practically 10 or less. Here, “length L” means the length excluding the height Hp of the convex portion 26 and the lengths of the lead wires 24A and 24B.

The type of the capacitor 10 of the present embodiment is not particularly limited as long as the shape of the capacitor body 20 is a columnar shape. For example, (1) electrolytic capacitors such as aluminum electrolytic capacitors, tantalum electrolytic capacitors, niobium capacitors, ( 2) An electric double layer capacitor, (3) a lithium ion capacitor, or the like may be used.

-Capacitor manufacturing method-
When manufacturing the capacitor 10 of the present embodiment is approximately normal, the capacitor body 20, with respect to the (attached before) fixing auxiliary terminal 30,50,60,70, with the center axis C1 of the convex portion 26 the outer peripheral surface of the projection 26 from the orthogonal more than one direction with respect to the convex portion 26 so as to be pressed, after placing the crimped and fixed members 32,52,62,72, crimped member 30, 50, 60, By caulking 70, at least a fixing auxiliary terminal attaching step for attaching the fixing auxiliary terminals 30, 50, 60, 70 to the capacitor body 20 is performed. That is, the fixing auxiliary terminals 30, 50, 60, and 70 are attached using the capacitor body 20 at the final stage of a series of processes for manufacturing the capacitor 10.

The capacitor main body 20 used when the fixing auxiliary terminal attaching step is performed is preferably in a state where no further processing / processing is required (completely completed state), but in a substantially completed state. May be. Here, the substantially completed state means a state where a minimum electrical function necessary for the capacitor is completed. For this reason, for example, the fixing auxiliary terminal attaching step may be performed on the capacitor body 20 in a state where the outer peripheral surface is not coated, or the capacitor body 20 in a state where the outer peripheral surface is coated. May be implemented.

Here, in the capacitor 10 of this embodiment, members having a function corresponding to the auxiliary terminal in the conventional capacitor with the auxiliary terminal are the convex portion 26 and the fixing auxiliary terminals 30, 50, 60 and 70. In addition, among the convex portion 26 and the fixing auxiliary terminals 30, 50, 60, and 70 having a function corresponding to an auxiliary terminal having a dimension much larger than the diameter of the capacitor, the dimension is very large and the bulky member Are auxiliary auxiliary terminals 30, 50, 60, 70 only. The reason for this is that the height of the convex portion 26 (the length of the convex portion 26 in the axial direction) is sufficient if it is sufficient to attach the auxiliary auxiliary terminals 30, 50, 60, 70 for fixing. This is because it is not necessary to make it larger than the diameter of the main body 20.

For this reason, in the manufacturing method of the capacitor 10 of the present embodiment, it is substantially the same as the conventional capacitor having no auxiliary terminal except for the fixing auxiliary terminal attaching step which is the final step among all the steps of manufacturing the capacitor 10. Each step is performed using the capacitor main body 20 and the intermediate product thereof having the same size. For this reason, in all the processes except the fixing auxiliary terminal attaching process, which is the final stage, it is possible to ensure the same handleability as a conventional capacitor having no auxiliary terminal. In addition to this, it is very easy to manufacture the capacitor 10 of this embodiment by diverting a conventional capacitor manufacturing line without auxiliary terminals.

For example, when manufacturing the capacitor 10 of the present embodiment, attention is paid to a handling member that holds the capacitor body 20 and conveys it to the axial center line C1 of the capacitor body 20. In this case, the transport distance can be set in substantially the same manner as when a capacitor without an auxiliary terminal is manufactured. This is because there is a certain margin in the conveyance distance of the handling member that is generally set in the existing production line, and this margin can be used. Therefore, it is not necessary to modify the production line so as to greatly increase the transport distance.

In addition to this, in the fixing auxiliary terminal attaching step, the fixing auxiliary terminal is attached by applying a force in a direction substantially orthogonal to the central axis of the convex portion 26. That is, substantially no force is applied to the axial direction of the capacitor body 20. For this reason, there is no possibility of variation in the electrical characteristics of the capacitor 10 due to a pressing force applied to the capacitor element 82 accommodated in the capacitor body 20.

On the other hand, in a conventional capacitor with an auxiliary terminal, if it is attempted to attach the auxiliary terminal by welding or the like at the final stage of the entire process of manufacturing the capacitor, it is necessary to apply a pressing force to the capacitor in the axial direction. Variations in electrical characteristics are likely to occur. For this reason, it is necessary to produce a capacitor with an auxiliary terminal attached in advance to a bottomed cylindrical case that houses the capacitor element. However, in such a manufacturing process, it is necessary to manufacture a capacitor using an intermediate product of a capacitor having an auxiliary terminal which is a very large dimension and a bulky member from the initial stage of the entire process of manufacturing the capacitor. . For this reason, compared with the case where the capacitor 10 of this embodiment is manufactured, in the conventional capacitor with an auxiliary terminal, the handleability is remarkably lowered from the initial stage of the whole process. Therefore, the conventional method for manufacturing a capacitor with an auxiliary terminal is inferior to the method for manufacturing the capacitor 10 of the present embodiment in terms of capacitor productivity. In addition to this, even if an attempt is made to divert a conventional capacitor production line that does not have an auxiliary terminal whose dimensions are substantially the same except for the auxiliary terminal, the existence of the auxiliary terminal, which is a very large and bulky member, is considered. Therefore, the production line needs to be significantly modified. For this reason, when an attempt is made to produce a conventional capacitor with auxiliary terminals by diverting a conventional capacitor production line without auxiliary terminals, it takes time and cost to modify the production line.

As described above, the method for manufacturing the capacitor 10 of the present embodiment is very excellent in terms of handling and ease of diversion of the manufacturing line, compared to the conventional method for manufacturing a capacitor with an auxiliary terminal. Therefore, it is easy to shorten the delivery time from receiving the first order to delivering the first lot to the customer. In addition, since the capacitor 10 of this embodiment has high productivity, it can be easily manufactured at a lower cost than a conventional capacitor with an auxiliary terminal.

It should be noted that the fixing auxiliary terminal attaching step can be performed specifically according to the procedure described below according to the type of the crimping fixing member. First, when the crimping fixing member is made of a hollow member selected from the ring-shaped member 32, the cylindrical member 52, and the coil-shaped member 62, the fixing auxiliary terminal attaching step is performed by placing the convex portion 26 in the hollow portion of the hollow member. It is carried out by caulking the hollow member in the inserted state. Further, when the crimping fixing member is a convex holding member selected from the semi-ring-shaped members 72, 76, 78 and the semi-cylindrical member, the fixing auxiliary terminal attaching step is performed on the inner peripheral side of the convex holding member. This is performed by caulking the convex portion holding member in a state where the convex portion 26 is arranged.

-Circuit board-
The board | substrate with a circuit of this embodiment is provided with the board | substrate which has three or more through-holes penetrated in the thickness direction, and the capacitor | condenser 10 of this embodiment at least. Here, with the two lead wires 24A, 24B and the rod-shaped members 34, 54, 64, 74 inserted into any three through holes selected from three or more through holes, the capacitor 10 is placed on the substrate. Fixed. When a high fixing strength is required, it is preferable that the capacitor main body 20 is substantially adhered to the substrate.

FIG. 12 is a schematic diagram showing an example of the circuit board according to the present embodiment. Specifically, the capacitor 10A shown in FIG. 1 is fixed to the surface of the board. Here, FIG. 12 (A) shows a cross-sectional view of the capacitor body as viewed from the side, FIG. 12 (B) shows a cross-sectional view as seen from one end surface side of the capacitor body, and FIG. Sectional drawing seen from the other end surface side of the capacitor | condenser main body is shown. However, in FIG. 12A, the description of the cross-sectional structure of the capacitor 10 is omitted, and the external appearance of the side surface is shown. Further, the cross section of the substrate 110 shown in FIG. 12A does not show a cross sectional structure when the surface 110T of the substrate 110 is linearly cut, but a cross sectional structure at a position where the rod-shaped member 34 is provided, and The sectional structure of the position where the lead wire 24A is provided or the position where the lead wire 24B is provided is shown.

As shown in FIG. 12, the substrate with circuit 100 includes a substrate 110 and a capacitor 10 in which the side surface of the capacitor body 20 is fixed to the surface 110T of the substrate 110. Here, the substrate 110 is provided with through holes 112A, 112B, and 112C penetrating in the thickness direction of the substrate 110. A lead wire 24A is inserted into the through hole 112A, a lead wire 24B is inserted into the through hole 112B, and a rod-shaped member 34 is inserted into the through hole 112C. The lead wires 24A, the lead wires 24B, and the tip portions of the rod-shaped members 34 slightly protrude from the back surface 110B of the substrate 110. By soldering to the back surface 110B in the vicinity of the tip portions, The periphery is covered with solder 120. When attaching the capacitor 10 </ b> A to the substrate 110, the lead wires 24 </ b> A and 24 </ b> B are bent in the same direction as the axial direction of the rod-shaped member 34.

In the circuit-equipped substrate 100 of this embodiment illustrated in FIG. 12, the capacitor 10 is fixed to the substrate 110 such that the columnar capacitor body 20 has an axial direction parallel to the surface of the substrate 110T. In addition to this, the capacitor 10 is fixed to the surface 110T of the substrate 110 in close contact with the side surface of the columnar capacitor body 20. For this reason, the board | substrate 100 with a circuit can be reduced in size. In addition to this, the capacitor 10 is fixed to the substrate 110 via three terminals provided on both end faces 22A and 22B, that is, two lead wires 24A and 24B and a fixing auxiliary terminal 32A. . Therefore, the capacitor 10 is more stably and firmly fixed to the substrate 110 and is not easily affected by vibration.

When assembling a circuit board using the electrolytic capacitor 10 provided with the auxiliary auxiliary terminals 30A, 30B, 30C, 30D, 60, 70A, 70B, and 70C illustrated in FIGS. 1 to 5 and 7 to 9, If the mounting positions of the fixing auxiliary terminals 30A, 30B, 30C, 30D, 60, 70A, and 70B with respect to the axial direction of the convex portion 26 are deviated, it may be difficult to assemble the circuit board. This is because it becomes difficult to insert the rod-shaped members 34, 64, 74 into the through holes 112 </ b> C provided in the substrate 110 due to the displacement.

In order to solve such a problem, for example, the fixing auxiliary terminals 30A, 30B, the ring-shaped member 32, the coil-shaped member 62, and the semi-ring-shaped members 72, 76, 78 are in contact with the end face 22B. 30C, 30D, 60, 70A, 70B, and 70C can be fixed to the convex portion 26. In addition, when the ring-shaped member 32 has the burring part 40 as illustrated in FIGS. 4 and 5, instead of bringing the main body of the ring-shaped member 32 into contact with the end face 22B, the burring part 40 is brought into contact with the end face 22B. In this state, the fixing auxiliary terminals 30A, 30B, 30C, 30D, 60, 70A, 70B, and 70C may be fixed to the convex portion 26.

The auxiliary terminals 30A, 30B, 30C, 30D, 60, 70A for fixing in a state where washers are arranged between the end face 22B and the ring-shaped member 32, the coil-shaped member 62, and the semi-ring-shaped members 72, 76, 78, 70B and 70C can also be fixed to the convex portion 26. Further, only the diameter of the vicinity of the end face 22B side of the convex portion 26 may be increased to have the same function as the washer.

10, 10A, 10B, 10C Capacitor 20 Capacitor body 22A, 22B End face 24A, 24B Lead wire (electrode terminal)
26 Protrusions 30, 30A, 30B, 30C, 30D Fixing auxiliary terminals 32, 32A, 32B, 32C, 32D Ring-shaped member (hollow member, crimp fixing member)
34 Bar-shaped member 36 Opening (hollow part)
38 Clearance
40, 40A, 40B Burring portion 50 Auxiliary terminal 52 for fixing cylindrical member (hollow member, pressure fixing member)
54 Bar-shaped member 60 Auxiliary terminal 62 for fixing Coil-shaped member (hollow member, crimping fixing member)
64 Rod-shaped members 70, 70A, 70B Auxiliary terminal 72 for fixing Semi-ring-shaped member (convex holding member, crimp fixing member)
74 Bar-shaped member 76 Semi-ring-shaped member (convex holding member, crimping fixing member)
76R, 76L Tip part 78 Semi-ring-shaped member (convex holding member, crimp fixing member)
80 Cylindrical case 80B Bottom 82 Capacitor element 100 Circuit board 110 Substrate 110T Front surface 110B Back surface 112A, 112B, 112C Through hole 120 Solder

Claims (15)

1. Has two electrode terminals on one end face, it has a columnar capacitor body having a columnar convex portion on the other end face, fixing the auxiliary terminal attached to the capacitor body, at least,
   The auxiliary terminal for fixing is
   While pressing the outer peripheral surface of the convex portion from more than one direction substantially perpendicular to the central axis of the convex portion, and the crimped member which is crimped to the convex portion, the piezoelectric deposition fixing member A capacitor having at least a connected rod-shaped member.
2. The capacitor of claim 1,
   The capacitor, wherein the crimp-fixing member is a hollow member selected from a ring-shaped member, a cylindrical member, and a coil-shaped member.
3. The capacitor according to claim 2,
   The hollow member is a ring-shaped member,
   The inner diameter direction of the opening of the ring-shaped member, said as the axial direction of the rod-like member is a substantially parallel, the rod-shaped member is connected to the outer edge of the ring-shaped member,
   Wherein the two electrode terminals, with respect to a straight line connecting the two points where the and the one end face of the cross, with the center axis of the rod-shaped member is disposed so as to be substantially perpendicular,
   The capacitor, wherein the ring-shaped member is fixed to the convex portion by pressure in a state where the convex portion is inserted into the opening of the ring-shaped member.
4. The capacitor according to claim 3,
   A capacitor comprising a burring portion extending along the inner edge side of the ring-shaped member so as to be substantially parallel to the axial direction of the opening.
5. The capacitor according to claim 4, wherein
   The capacitor, wherein the burring portion is divided into two or more along the circumferential direction of the opening.
6. The capacitor according to claim 4 or 5,
   The capacitor, wherein the burring portion is divided into four along the circumferential direction of the opening.
7. The capacitor according to claim 2,
   The hollow member is a cylindrical member with a bottom,
   The axial direction of the tubular member, wherein as the axial direction of the rod-like member substantially coincides, the rod-shaped member is connected to the outer surface of the bottom portion of the tubular member,
   The capacitor, wherein the cylindrical member is fixed to the convex portion by pressure in a state where the convex portion is inserted into the cylindrical member.
8. The capacitor of claim 1,
   The crimp fixing member is a convex holding member selected from a semi-ring member and a semi-cylindrical member,
   The capacitor, wherein the convex portion holding member is fixed to the convex portion by pressure in a state where the convex portion is disposed on the inner peripheral side of the convex portion holding member.
9. The capacitor according to any one of claims 1 to 8,
   The capacitor body is
   A capacitor element;
   The two electrode terminals connected to the capacitor element;
   A cylindrical case with a bottom for storing the capacitor element;
   The protrusion provided to protrude outside the bottom surface of the cylindrical case, and at least
   The capacitor, wherein the cylindrical case and the convex portion are integrally formed.
10. The capacitor according to any one of claims 1 to 9,
    A capacitor satisfying the following formula (1).
    Formula (1) 0 <Hp ≦ DC / 1.5
    [In said Formula (1), Hp represents the height (mm) of the said convex part, and DC represents the diameter (mm) of the said capacitor | condenser main body. ]
11. The capacitor according to any one of claims 1 to 10,
    A capacitor satisfying the following formula (2).
    Formula (2) DC / 20 ≦ Dp <DC
    [In said Formula (2), Dp represents the diameter (mm) of the said convex part, and DC represents the diameter (mm) of the said capacitor | condenser main body. ]
12. The capacitor according to any one of claims 1 to 11,
    A ratio of a length to a diameter of the capacitor body is 1.2 or more.
13. A columnar capacitor body having two electrode terminals on one end face and a convex portion on the other end face;
    By pressing the outer peripheral surface of the convex portion from more than one direction substantially perpendicular to the central axis of the convex portion, the crimping fixable crimped member relative to the convex portion, and piezoelectric deposition fixing member An auxiliary terminal for fixing having a rod-shaped member connected to
    Relative to the protruding portion so that it can press the outer peripheral surface of the convex portion from more than one direction substantially perpendicular to the central axis of the convex portions, after placing the crimped and fixed member, the crimped member by caulking, the capacitor of the fixing auxiliary terminal, said at least through the fixing auxiliary terminal mounting step of mounting the capacitor body, characterized by fabricating a capacitor according to any one of claims 1 to 12 Manufacturing method.
14. The capacitor manufacturing method according to claim 13, wherein the crimp-fixing member is a hollow member selected from a ring-shaped member, a cylindrical member, and a coil-shaped member,
    The fixing auxiliary terminal attaching step includes
    A method of manufacturing a capacitor, which is performed by caulking the hollow member in a state where the convex portion is inserted into the hollow portion of the hollow member.
15. A substrate having three or more through holes penetrating in the thickness direction;
    A capacitor according to any one of claims 1 to 12,
    The capacitor is fixed to the substrate in a state where the two electrode terminals and the rod-shaped member are respectively inserted into any three through holes selected from the three or more through holes. Circuit board to be used.
    

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