JP2005183575A - Surface-mounting aluminum electrolytic capacitor, and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems of a laid surface-mounting aluminum electrolytic capacitor that confirming a soldering filet is difficult and a floating failure happens upon mounting the capacitor on a board, in order to provide the surface-mounting aluminum electrolytic capacitor that is highly reliable in mounting and can be manufactured inexpensively. <P>SOLUTION: The aluminum electrolytic capacitor 1 is held in a laid position with an outer packaging member 6, and lead wires 2 which are lead out of the capacitor 1, are bent in a stepped manner along the outer packaging member 6, and are extended over the extension of the mounting surface of the outer packaging member 6. The outer packaging member 6 has a section of a U shape, and holds the peripheral surface of the electrolytic capacitor 1 on the inner surface of the outer packaging member 6, and has a wall 6a that is in contact with almost the half of the face of the capacitor 1 that is at the side of a sealing member 5. The lead wires 2 are bent along the outer surface of the wall 6a. Hence, the aluminum electrolytic capacitor 1 having the above structure facilitates the confirmation of the soldering filet, eliminates a floating failure to improve reliability in mounting, and is manufactured inexpensively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a surface mount aluminum electrolytic capacitor used in various electronic devices and a method for manufacturing the same.

  FIG. 7 is a perspective view showing the configuration of this type of conventional surface mount aluminum electrolytic capacitor. In FIG. 7, 10 is an aluminum electrolytic capacitor, 11 is a pair of lead wires drawn from the aluminum electrolytic capacitor, Reference numeral 12 denotes an exterior member in which the aluminum electrolytic capacitor 10 is accommodated. The pair of lead wires 11 are accommodated in the exterior member 12 and then bent along the exterior member 12, and the terminal ends of the exterior member 12 are substrates. It is housed in a groove 12a provided on the bottom surface to be a mounting surface to form a connection terminal to the substrate, thereby forming a horizontally mounted surface mounting type aluminum electrolytic capacitor, which is particularly required to have a low profile. Used for various purposes.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 7-6934 A

  However, in the conventional surface mount type aluminum electrolytic capacitor, after housing the aluminum electrolytic capacitor 10 in the exterior member 12, the pair of lead wires 11 drawn out from the aluminum electrolytic capacitor 10 are bent along the exterior member 12, and the terminal ends thereof. Is mounted in a groove 12a provided on the bottom surface that is the mounting surface of the exterior member 12 on the substrate and is used as a connection terminal to the substrate. Therefore, when soldering to the substrate through the connection terminal, Is difficult to confirm the solder fillet because the soldered portion is hidden under the lower surface of the exterior member 12, and solder balls are likely to be generated between the substrate and the exterior member 12 when the solder melts. There was a problem that the mounting reliability was lacking.

  Further, as shown in FIG. 8, due to the heat of reflow solder when mounted on the substrate 14, a springback phenomenon occurs in the pair of bent lead wires 11, thereby the exterior member 12 that houses the aluminum electrolytic capacitor 10. In order to solve this problem, the conductive paste 13 is applied to the bottom surface (mounting surface on the substrate) of the exterior member 12 and soldered to the substrate, but this increases the cost. As a result, there has been a problem that a radical solution has not been reached.

  The present invention solves such a conventional problem and provides a surface mount aluminum electrolytic capacitor that is excellent in mounting reliability and can be manufactured at low cost by facilitating confirmation of a solder fillet. It is the purpose.

  In order to solve the above-mentioned problem, the invention described in claim 1 of the present invention is composed of an aluminum electrolytic capacitor and an exterior member made of an insulating resin that holds the aluminum electrolytic capacitor in a horizontal state. A pair of lead wires drawn out from the aluminum electrolytic capacitor are bent stepwise along the exterior member so as to extend on the extension of one surface of the exterior member, and this surface is used as a mounting surface on the substrate. In the mounting type aluminum electrolytic capacitor, the exterior member is formed in a U-shaped cross section, holds the circumferential surface of the aluminum electrolytic capacitor on the inner surface, and a wall that contacts substantially half of the surface on the opening side sealed by the sealing member And the pair of lead wires are bent along the outer surface of the wall portion, so that the lead wires can be folded. Since the bending process is bent in the opposite direction to the aluminum electrolytic capacitor body, there is no occurrence of springback phenomenon as in the past, so there is no defective product floating, and the bent lead wire is exposed from the exterior member. Because of this configuration, it is very easy to check the solder fillet when mounting on the board, solder balls are not generated, and the mounting reliability can be improved. It has the effect of being able to do.

  The invention according to claim 2 of the present invention is particularly composed of an aluminum electrolytic capacitor and an exterior member made of an insulating resin that holds the aluminum electrolytic capacitor in a horizontal state, and is drawn from the aluminum electrolytic capacitor. In a surface-mount type aluminum electrolytic capacitor in which a pair of lead wires are bent stepwise along the exterior member so as to extend on an extension of one surface of the exterior member, and this surface is a mounting surface on the substrate. The exterior member is integrally provided with a semicircular cavity portion into which the aluminum electrolytic capacitor is fitted and a wall portion where the pair of lead wires are in contact with upper ends, and the exterior members are opposed to each other in pairs. A pair of lead wires that are joined so as to sandwich an aluminum electrolytic capacitor and protrude outward from the wall portion are bent along the outer surface of the wall portion of the exterior member, The Les has the effect that tends to the aluminum electrolytic capacitor finished bending a lead in the package member.

  The invention according to claim 3 of the present invention is configured such that a projection located between a pair of lead wires bent along the outer surface is provided on the outer surface of the wall portion of the exterior member. Thus, there is an effect that the pair of lead wires can be surely positioned and rotation of the aluminum electrolytic capacitor in the exterior member can be prevented.

  The invention according to claim 4 of the present invention has a structure in which a projection is provided on the mounting surface of the exterior member on the substrate, whereby three portions of the projection and the pair of lead wires contact the substrate. Since they come into contact with each other, there is an effect that the stability of mounting can be improved.

  The invention according to claim 5 of the present invention is such that the projection provided on the exterior member or the exterior member including the projection is made of an insulating rubber. There is an effect that the resistance to vibration can be improved by increasing the resistance.

  The invention according to claim 6 of the present invention has a configuration in which the surface facing the mounting surface of the exterior member is used as a display surface, so that the display contents such as the product number and rating can be displayed even when mounted on the substrate. It has the effect that confirmation can be performed easily and reliably.

  The invention according to claim 7 of the present invention is configured such that at least the mounting surface of the pair of lead wires is flattened, thereby increasing the soldering area and improving the mounting reliability. It has the effect that it can be improved.

  According to an eighth aspect of the present invention, there is provided a square tubular lead wire processing jig provided with a horizontal cutout portion on one side surface, and an aluminum electrolysis is provided in the cavity of the lead wire processing jig. A capacitor is inserted and a pair of lead wires drawn out from the aluminum electrolytic capacitor is placed on the notch and led out of the lead wire processing jig. In this state, the pair of lead wires is processed into a lead wire. After bending a pair of lead wires in a step shape by bending at a right angle along the jig and then at a right angle in the opposite direction, the exterior member configured to hold the aluminum electrolytic capacitor horizontally This method is designed to be inserted. By this method, the lead wire bending process is performed in a separate process, so multiple processes can be performed with high accuracy. It has the effect that an excellent surface mounting type aluminum electrolytic capacitor mounting reliability in configuration accuracy, and can be produced at low cost.

  As described above, the surface mount type aluminum electrolytic capacitor and the method for manufacturing the same according to the present invention are performed in a separate process before the lead wire is bent into the exterior member, and in the opposite direction to the aluminum electrolytic capacitor body. Because there is no occurrence of spring back phenomenon as in the past, there is no defective product floating, and the bent lead wire is exposed from the exterior member, so confirmation of the solder fillet when mounting on the board Thus, the solder ball is not generated and the reliability of the mounting can be improved. In addition, a special effect can be obtained that it can be manufactured at a low cost with a simple configuration.

(Embodiment 1)
In the following, the first aspect of the present invention will be described using the first embodiment.

  1 is a cross-sectional view showing a configuration of a surface mount aluminum electrolytic capacitor according to Embodiment 1 of the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 shows an exterior member used for the surface mount aluminum electrolytic capacitor. 1 to 3, reference numeral 1 denotes an aluminum electrolytic capacitor, and 6 denotes an exterior member made of an insulating resin that holds the aluminum electrolytic capacitor 1 in a horizontal state.

  The aluminum electrolytic capacitor 1 has a roughened aluminum foil surface, a dielectric oxide film layer formed by anodic oxidation, and an anode foil (not shown) to which an external lead wire 2 is connected, and an aluminum foil. And a cathode foil (not shown) to which an external lead wire 2 is connected and wound with a separator (not shown) interposed therebetween. The element 3 is housed in a bottomed cylindrical metal case 4 made of aluminum together with a driving electrolyte (not shown), and the sealing member 5 made of an elastic material such as rubber is drawn out from the capacitor element 3. After the pair of lead wires 2 are inserted and fitted into the opening of the metal case 4, the vicinity of the opening of the metal case 4 is drawn into an annular shape so as to pressurize the sealing member 5 from the peripheral surface, Are those constituted by sealing by curling an open end of the metal case 4 et.

  Further, the exterior member 6 is formed in a U-shaped cross section and holds the peripheral surface of the aluminum electrolytic capacitor 1 on the inner surface, and the bottom surface side in the figure is a mounting surface on the substrate, and the sealing member 5 of the aluminum electrolytic capacitor 1 A wall portion 6a that contacts substantially half of the side is provided on one end side so as to be connected to the mounting surface, and a projection 6b that guides the pair of lead wires 2 is provided on the outer surface of the wall portion 6a. A projection 6c is provided on the bottom side end (the side opposite to the wall 6a) which is a mounting surface on the substrate.

  Next, a method for manufacturing the surface-mounted aluminum electrolytic capacitor according to the present embodiment configured as described above will be described with reference to FIGS. 4A to 4C. First, as shown in FIG. A rectangular tube-shaped lead wire processing jig 7 having a horizontal cutout portion 7a on one side surface is prepared, and a pair of lead wires 2 for external lead-out are led out into the hollow portion of the lead wire processing jig 7. The aluminum electrolytic capacitor 1 thus placed is inserted in a horizontal state, and a pair of lead wires 2 led out from the aluminum electrolytic capacitor 1 are disposed in a notch 7 a provided in the lead wire processing jig 7.

  Subsequently, as shown in FIG. 4B, the pair of lead wires 2 exposed to the outside from the notch portion 7 a provided in the lead wire processing jig 7 are arranged along the outer surface of the lead wire processing jig 7. And then bending the pair of lead wires 2 in a stepwise manner by bending the bottom surface at a right angle in the opposite direction (the direction away from the lead wire processing jig 7), and then bending the pair of lead wires 2 The aluminum electrolytic capacitor 1 that has been finished is taken out from the lead wire processing jig 7 and inserted from the opening on the side surface of the exterior member 6 as shown in FIG.

  Table 1 shows the result of confirming the mounting reliability when the surface-mounting type aluminum electrolytic capacitor according to the present embodiment configured as described above is mounted on a substrate, compared with a conventional product as a comparative example.

  As described above, the surface-mount type aluminum electrolytic capacitor according to the present embodiment can accurately perform even complicated processing because the bending process of the lead wire 2 is performed in a separate process, and in the opposite direction to the aluminum electrolytic capacitor main body. Since it is bent, there is no occurrence of a springback phenomenon as in the prior art, so there is no defective floating of the product, and since the bent lead wire 2 is exposed from the exterior member 6, The solder fillet can be very easily confirmed, solder balls are not generated, and the mounting reliability can be improved. Moreover, the solder fillet can be manufactured at a low cost with a simple configuration.

  Further, the pair of lead wires 2 can be guided by the projections 6b provided on the outer surface of the wall portion 6a of the exterior member 6 to prevent the aluminum electrolytic capacitor 1 from rotating in the exterior member 6, and the exterior member 6 can be prevented from rotating. The projection 6c provided at the end portion of the bottom surface of the substrate has a special effect such that stability at the time of substrate mounting can be improved.

  In addition, the display surface can be confirmed even when mounted on the substrate by displaying the product number, rating, etc. on the display surface, with the top surface of the exterior member 6 (the surface facing the mounting surface on the substrate) as the display surface. It will be able to be done.

  In the present embodiment, the lead wire processing jig 7 for bending the pair of lead wires 2 of the aluminum electrolytic capacitor 1 is a square tube provided with a horizontal cutout portion 7a on one side surface. However, the present invention is not limited to this, and any structure can be used as long as it can hold the aluminum electrolytic capacitor 1 and bend the lead wire 2.

  In addition, the projection 6c provided at the end of the bottom surface of the exterior member 6 has been described as being formed integrally with the insulating resin that constitutes the exterior member 6, but the present invention is not limited to this, By making a rubber protrusion as a component and coupling it to a predetermined position, or by configuring the entire exterior member 6 including the protrusion 6c with rubber, the frictional resistance with the substrate is increased, and the board mounting is further improved. The stability of time can be improved.

(Embodiment 2)
The second aspect of the present invention will be described below with reference to the second embodiment.

  The present embodiment is different in the configuration of the exterior member of the surface mount aluminum electrolytic capacitor according to the first embodiment, and since the other configuration is the same as that of the first embodiment, the same reference numerals are used for the same portions. Detailed description thereof will be omitted, and only different parts will be described below with reference to the drawings.

  FIG. 5 is a cross-sectional view showing a configuration of a surface mount aluminum electrolytic capacitor according to Embodiment 2 of the present invention, and FIG. 6 is a perspective view showing an exterior member used for the surface mount aluminum electrolytic capacitor. In FIGS. 5 and 6, reference numeral 1 denotes an aluminum electrolytic capacitor similar to that of the first embodiment, and 8 denotes an exterior member made of an insulating resin that holds the aluminum electrolytic capacitor 1 in a horizontal state.

  As shown in detail in FIG. 6, the exterior member 8 has a configuration in which two exterior members 8 are opposed to each other in a pair so as to sandwich the aluminum electrolytic capacitor 1, and the semicircular shape into which the aluminum electrolytic capacitor 1 is fitted. A hollow portion 8a and a wall portion 8b with which a pair of lead wires 2 abut on the upper end are integrally provided, and the aluminum electrolytic capacitor 1 is sandwiched and welded or bonded with the exterior members 8 facing each other in pairs. The pair of lead wires 2 projecting outward from the wall portion 8b are configured so as to be along the outer surface of the wall portion 8b.

  Further, the outer surface of the wall portion 8b of the exterior member 8 is provided with projections 8c for guiding the pair of lead wires 2 in the same manner as in the first embodiment, and further, the bottom side end serving as the mounting surface on the substrate. The projection (8d) is provided on the portion (the side opposite to the wall portion 8b).

  The surface mount type aluminum electrolytic capacitor according to the present embodiment configured as described above can improve the mounting reliability with a simple configuration as in the first embodiment, and can be manufactured at a low cost, and also has a lead structure. The aluminum electrolytic capacitor 1 which has finished the bending process of the wire 2 has an exceptional effect that it can be easily inserted into the exterior member 8.

  The surface mount type aluminum electrolytic capacitor according to the present invention is characterized in that mounting reliability is improved with a simple structure and can be manufactured at a low cost, and the surface mount aluminum electrolytic capacitor is required to have a low profile. It is useful as a capacitor.

Sectional drawing which showed the structure of the surface mount-type aluminum electrolytic capacitor by Embodiment 1 of this invention Same perspective view The perspective view which showed the exterior member used for the same surface mount type aluminum electrolytic capacitor (A)-(c) Manufacturing process diagram showing manufacturing method of same surface mounting type aluminum electrolytic capacitor Sectional drawing which showed the structure of the surface mount-type aluminum electrolytic capacitor by Embodiment 2 of this invention The perspective view which showed the exterior member used for the same surface mount type aluminum electrolytic capacitor A perspective view showing the configuration of a conventional surface mount aluminum electrolytic capacitor Front view showing a defective state when mounting a conventional surface mount aluminum electrolytic capacitor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Aluminum electrolytic capacitor 2 Lead wire 3 Capacitor element 4 Metal case 5 Sealing member 6, 8 Exterior member 6a, 8b Wall part 6b, 6c, 8c, 8d Protrusion 7 Lead wire processing jig 8a Semicircular hollow part

Claims (8)

An aluminum electrolytic capacitor in which a capacitor element having a pair of external lead wires is housed in a bottomed cylindrical metal case together with a driving electrolyte, and the opening of the metal case is sealed with a sealing member, and the aluminum It is composed of an exterior member made of an insulating resin that holds the electrolytic capacitor in a horizontal state, and the pair of lead wires are bent along the exterior member in a step shape so as to extend on an extension of one surface of the exterior member. In the surface mount type aluminum electrolytic capacitor having this surface as the mounting surface on the substrate, the exterior member is formed in a U-shaped cross section so that the inner surface holds the peripheral surface of the aluminum electrolytic capacitor and is sealed with a sealing member. A wall portion that abuts substantially half of the stopped opening side surface is integrally provided so as to be connected to the mounting surface, and the pair of lead wires are bent along the outer surface of the wall portion. In a surface-mount aluminum electrolytic capacitors thing. An aluminum electrolytic capacitor in which a capacitor element having a pair of external lead wires is housed in a bottomed cylindrical metal case together with a driving electrolyte, and the opening of the metal case is sealed with a sealing member, and the aluminum It is composed of an exterior member made of an insulating resin that holds the electrolytic capacitor in a horizontal state, and the pair of lead wires are bent along the exterior member in a step shape so as to extend on an extension of one surface of the exterior member. In the surface mounting type aluminum electrolytic capacitor having this surface as a mounting surface on the substrate, the exterior member includes a semicircular cavity portion into which the aluminum electrolytic capacitor is fitted, and the pair of lead wires at the upper end. The abutting wall portion is provided integrally, and a pair of lead members projecting outwardly from the wall portion are coupled so as to sandwich the aluminum electrolytic capacitor with a pair of the exterior members facing each other. Wall which was bent along the outer surface is a surface mount type aluminum electrolytic capacitor of the line exterior member. The surface mount aluminum electrolytic capacitor according to claim 1 or 2, wherein a protrusion located between a pair of lead wires bent along the outer surface is provided on the outer surface of the wall portion of the exterior member. The surface-mount type aluminum electrolytic capacitor according to claim 1, wherein a protrusion is provided on a mounting surface of the exterior member on the substrate. The surface-mount type aluminum electrolytic capacitor according to claim 4, wherein the protrusion provided on the exterior member or the exterior member including the protrusion is made of an insulating rubber. The surface-mount type aluminum electrolytic capacitor according to claim 1, wherein a surface facing the mounting surface of the exterior member is a display surface. The surface-mounting type aluminum electrolytic capacitor according to claim 1 or 2, wherein at least the mounting surface of the pair of lead wires on the substrate is flattened. Prepare a square tubular lead wire processing jig with a horizontal cutout on one side, insert an aluminum electrolytic capacitor into the cavity of this lead wire processing jig, and pull out from this aluminum electrolytic capacitor Place the pair of lead wires for external drawing on the notch and lead them to the outside of the lead wire processing jig, and in this state, bend the pair of lead wires at right angles along the lead wire processing jig In addition, after bending a pair of lead wires in a staircase shape by bending them at right angles in the opposite direction, this surface mount type is designed to be inserted into an exterior member configured to hold the aluminum electrolytic capacitor in a horizontal state. Manufacturing method of aluminum electrolytic capacitor.

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