JP2011187890A - Capacitor device and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To visually confirm a place of connection between a chip type ceramic capacitor and a connection terminal. <P>SOLUTION: A case in a rectangular parallelepiped shape is used which has one surface linked to the other surface by hollow parts such that the hollow part on the one surface side is wider than the hollow part on the other surface side, and which has through-holes linked to the hollow part on the one surface side and not linked to the hollow part on the other surface side. An external connection terminal for an electrode which leads a weld part and leads an external led part to outside the case in the rectangular parallelepiped shape is fitted to a base comprising the large and small hollow parts, and an external connection terminal for grounding which leads a weld part and leads an external led part to outside the case in the rectangular parallelepiped shape is fitted to a part where the large and small hollow parts comes into contact with each other. A capacitor element is installed in the hollow part on the one surface side, terminals thereof are welded to the weld parts of the external connection terminals, respectively, and the hollow parts are filled with resin. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a chip-type capacitor device used for removing spark noise generated in, for example, a commutator motor, and a manufacturing method thereof.

  In order to remove spark noise generally generated during commutation of a commutator motor and reduce the influence on an electronic device mounted on a vehicle or the like, it is more widely disclosed in, for example, Patent Document 1 to arrange a chip-type capacitor between brushes. Are known.

  In recent years, the above-mentioned chip type capacitors are rapidly spreading due to the development of ceramic capacitor elements having an improved noise removal function. However, as disclosed in Patent Document 2, for example, a ceramic capacitor is simply used as a plastic case. The mainstream was to place and mold the capacitor chip.

JP 2001-57765 A JP-A-9-232196

  Since the capacitor device manufactured by the method described in Patent Document 2 has been molded, it is impossible to visually confirm the connection location between the capacitor and the connection terminal. As an inspection point for confirming the finish of the capacitor device, there is no established method for confirming the state of the capacitor device before the finished product even though the connection location between the capacitor and the connection terminal is important.

  As a result, it was common to check continuity using a measuring instrument after the finished product. Of course, it is possible to confirm using an X-ray inspection apparatus or the like, but it is inevitable that the inspection apparatus becomes large and economically disadvantageous.

  In the capacitor device of the present invention, the one surface and the other surface of the rectangular parallelepiped case communicate with each other and are mold-sealed. Inside the one surface, the chip capacitor and the welded portion of the external connection terminal are welded, and the other surface is welded. The mold area is narrower than the mold area on one side and has a plurality of mold areas on the other side.

  An external connection terminal is led from the other side.

  In the capacitor device of the present invention, the one surface and the other surface communicate with each other through a hollow portion, the hollow portion on one surface side is wider than the hollow portion on the other surface side, and communicates with the hollow portion on the one surface side. A rectangular parallelepiped case having a through-hole that does not communicate with the hollow portion on the direction side, an external connection terminal for an electrode for guiding the welded portion to the base portion formed by a large and small hollow portion, and leading the external extraction portion outside the rectangular parallelepiped case, large and small The external connection terminal for ground that leads the welded part to the part where the hollow part of the lead contacts and leads the external takeout part outside the rectangular parallelepiped case, is provided in the hollow part on one side, and that terminal is connected to the welded part of the external connection terminal Each consists of a welded capacitor element and a resin filled in the hollow portion.

  The manufacturing method of the capacitor device of the present invention communicates between one side and the other side with a hollow part, the hollow part on one side is wider than the hollow part on the other side, and communicates with the hollow part on one side. For the electrode that uses a rectangular parallelepiped case with a through hole that does not communicate with the hollow portion on the other side, guides the welded part to the base formed by the large and small hollow parts, and leads the external extraction part outside the rectangular parallelepiped case The external connection terminal is attached, the welded portion is guided to the portion where the large and small hollow portions are in contact, the external connection terminal for grounding is guided to the outside of the rectangular parallelepiped case, and the capacitor element is placed in the hollow portion on one side And the terminals are welded to the welded portions of the external connection terminals, respectively, and the hollow portion is filled with resin.

  Further, it is preferable to perform the welding operation of the capacitor element terminal and the external connection terminal in the hollow portion on the one surface side, and monitor the welding operation and the welding result from the hollow portion on the other surface side.

  Further, when filling the hollow portion with the resin, it is preferable to place the rectangular parallelepiped case on the mounting table with the hollow portion on one side facing down, and fill the resin from the hollow portion on the other side.

  Further, when the resin is filled in the hollow portion, the through hole is preferably a hole for venting air.

  In addition, after monitoring the welding operation and the welding result, it is preferable to place the rectangular parallelepiped case on the mounting table with the hollow part on one side facing down and to fill the resin from the hollow part on the other side. .

  The connection location of the chip-type ceramic capacitor and the connection terminal can be visually confirmed from the hole on the back surface.

The figure shows a chip-type capacitor element placed in the hollow part where the welded sections are aligned. Vertical section of a motor equipped with the capacitor device of the present invention Cross-sectional view of a motor equipped with the capacitor device of the present invention The figure which shows the surface of the plastic capacitor | condenser case 15 The figure which shows the back surface of plastic capacitor case 15 The figure which shows the BB cross section of the plastic capacitor | condenser case 15 of FIG. The figure which shows the connecting terminal 16 and the earthing terminal 17 which are attached to the plastic capacitor | condenser case 15. The figure which shows the state which attached the connection terminal 16 and the ground terminal 17 to the plastic capacitor | condenser case 15. The figure which showed the hollow part when FIG. 8 is seen from the surface side The figure which displayed welding section part 16b, 17b on the sectional view of Drawing 6 The figure which shows the BB cross section of FIG. 6 at the time of mold resin filling The figure which shows the front side external appearance of the capacitor | condenser apparatus manufactured by this invention The figure which shows the back side external appearance of the capacitor | condenser apparatus manufactured by this invention

  Hereinafter, an embodiment for carrying out the present invention will be described.

  2 and 3 show a general motor configuration to which the capacitor device of the present invention can be applied. Of these, FIG. 2 shows an axial longitudinal sectional view of the motor. FIG. 3 shows a cross section taken along line AA in FIG.

  In FIG. 2, the motor 1 fixes a plurality of magnets 3 constituting a fixed magnetic pole to the inner periphery of a cylindrical casing 2, and the opening on the right side of FIG. The rotor 5 has the left end of the shaft 6 serving as a rotation shaft held at the center of the side surface of the casing 2 via a bearing 7 and the right end similarly held at the center of the side surface of the end bracket 4 via a bearing 71. .

  Further, as well illustrated in FIG. 3 showing the positional relationship when viewed from the broken line AA in FIG. 2, the brushes 9 that slide on the commutator 8 are respectively connected to the brush base 11 via the brush holder 10. The brush base 11 is fixed to the inner side surface of the end bracket 4.

  In FIG. 3, a capacitor device 12 is installed between the positive and negative electrodes of the brush 9. That is, in the illustrated example, the connection terminal plate 16 of the capacitor device 12 is positioned so as to be connected in parallel between the positive and negative electrodes of the brush 9, and the ground terminal 17 of the capacitor device 12 is connected to the end bracket 4 side.

  The capacitor device of the present invention applied to the motor is mainly composed of two parts other than the capacitor as the main body. A plastic capacitor case 15 and a connection terminal 16 and a ground terminal 17 attached to the case.

  The thermoplastic plastic capacitor case 15 is formed in a rectangular parallelepiped shape as shown in a front view in FIG. 4 and a rear view in FIG. 5, and has a first hollow portion 13 in the center on the front side in FIG. 5 has a second hollow portion 14 smaller than the first hollow portion at the center of the back side.

  The smaller hollow portion 13 is formed in the larger hollow portion 14. Therefore, the cross section of the rectangular parallelepiped plastic capacitor case 15 is such that one hollow portion is formed in a different size from the front side to the back side as shown in FIG. 6 showing the BB cross section of FIG. A base 18 is formed in the middle. The capacitor case 15 is provided with a through hole 19 at a position communicating with the first hollow portion and not communicating with the second hollow portion 14. The installation position of the through hole 19 is provided on the base portion 18 formed by two hollow portions. In addition, the role of the through-hole 19 is demonstrated in an appropriate scene sequentially.

  The connection terminal 16 and the ground terminal 17 attached to the case 15 are formed in a step shape as shown in FIG. 7, and are respectively provided with external extraction parts 16 a and 17 a, case attachment parts 16 c and 17 c, and welded pieces. It consists of portions 16b and 17b. Of these, the case attachment portions 16 c and 17 c serve to attach the connection terminal 16 and the ground terminal 17 to the plastic capacitor case 15. In addition, two connection terminals 16 are provided. Finally, these are connected to the positive electrode and the negative electrode of the capacitor and become external connection terminals of the capacitor device 12. Moreover, the hole 20 is formed in the different position in the welding section | part 16b.

  FIG. 8 shows a state in which the connection terminal 16 and the ground terminal 17 are attached to the plastic capacitor case 15. However, the welding section portions 16b and 17b are not displayed so as to clearly understand the mounting state. As can be seen from this, the connection terminal 16 and the ground terminal 17 have the case mounting portions 16c and 17c placed on the opposing surfaces in the hollow portion 13 of the plastic capacitor case 15 and the external extraction portions 16a and 17a. Can be attached from the bottom to the outside. Needless to say, an installation hole or the like is appropriately formed in the plastic capacitor case 15 for installation at this position.

  FIG. 9 shows a hollow portion when FIG. 8 is viewed from the front surface side (upper part of FIG. 9). Using this figure, the welding sections 16b and 17b which are not shown in FIG. 9 are shown. The positional relationship will be described. In FIG. 9, first, the hollow portion 14 in which the outer line 14 is large and the hollow portion 13 in which the inner line 13 is small are shown. Therefore, the part shown by the oblique line in the lower right direction is the base part 18 formed by two hollow parts, and the white part is the hollow part 14 (small hollow part) penetrating from the front to the back.

  As can be understood from the attachment positions of the connection terminal 16 and the ground terminal 17 in FIG. 8, the welded piece portion 17 b of the ground terminal 17 extends in the hollow portion 14 from the top to the bottom in the figure, On both sides of the welded piece portion 17b, welded piece portions 16b of the two connection terminals 16 extend in the base 18 from the bottom to the top of the figure.

  FIG. 10 shows the positional relationship of FIG. 9 with the welded piece portions 16b and 17b displayed on the cross-sectional view of FIG. 6, and the base portion 18 at the height position formed by the two hollow portions 13 and 14 is shown. On top, the welding section 16b is positioned so as to sandwich 17b. Further, the hole 20 formed in the welded piece portion 16b of the two connection terminals 16 is provided at a position corresponding to the through-hole 19 in FIG. 8, and is assembled to the state in FIG. 8 by inserting a pin therein. The attachment positions of the connection terminal 16 and the ground terminal 17 can be fixed.

  Further, according to FIG. 9, the downward slanted line region surrounded by the lines 14 and 13 is a member (base part 18) forming a part of the capacitor case 15 and cannot be seen through. Since it is hollow, it is possible to visually recognize the mounting state of the welded sections 16b and 17b. For this reason, the welded piece portion 17 b of the ground terminal 17 is a member having a sufficiently narrow width with respect to the lateral width of the hollow portion 13.

  FIG. 1 is a diagram in which a chip-type capacitor element 30 is placed in a hollow portion 14 in which weld sections are aligned and arranged in the order of 16b, 17b, and 16b. Here, when the chip-type capacitor element 30 is placed, the left and right sides 31 and 32 are portions that become positive or negative electrode terminals, and the front and rear sides 33 and 34 are portions that become ground terminals. When the chip-type capacitor element 30 is attached to the welded piece portion, the electrode terminals on the left and right sides 31 and 32 are placed on the welded piece portion 16 b of the connection terminal 16, and the front and rear sides 33 and 34 are on the ground terminal 17. It is placed on the welded piece portion 17b.

  In this state, the electrode terminals of the left and right surfaces 31 and 32 and the respective welded piece portions 16b of the connection terminal 16 are welded or brazed (hereinafter simply referred to as brazing) as 40 and 41, and the front and rear surfaces 33 , 34 and the welded piece portion 17b of the ground terminal 17 are brazed as indicated by 42. This brazing is performed by inserting a welding device from the side of the large hollow portion 13. At this time, it is desired to confirm that the welded section portions 16b and 17b do not contact each other as indicated by 43 in FIG. . However, as can be fully understood from the description of FIG. 9 or FIG. 10, in the present invention, welding work and its result from the side of the hollow portion 13 are used for the industrial use of the opposite space portion 14 side. The state of brazing can be visually observed with a camera.

  Next, mold resin is injected into the hollow portions 13 and 14 of the capacitor case 15. 11 is a cross-sectional view taken along the line B-B of FIG. 4, and is placed on the table 50 so that the lower side is a large hollow portion 13 and the upper side is a small hollow portion 14. In the hollow portion 13, the chip capacitor element 30 is brazed to the welded piece portions 16 b and 17 b.

  In this vertical position relationship, the plastic case 15 is placed on the mounting table 50, and the mold resin 21 is filled from above from the hollow portion 14 side, whereby the chip capacitor element 30 and the internal connection portions 16b of the connection terminals 15 and 16 are filled. , 17b are hermetically held in the hollow portion 13. The air 35 that is exhausted by filling the hollow portion 13 with the mold resin 21 passes through the through hole 19 and is discharged to the atmosphere.

  At this time, the capacitor case 15 to which the connection terminals are joined is preheated in a heating furnace in order to enhance the fusion with the mold resin, and is filled with the mold resin heated to 100 degrees or more. This mold resin is dropped so as to drop by its own weight, and fills the hollow portion 13. However, since the air bubbles generated in the mold resin are similarly warmed, it gradually escapes from the through hole 19 to the outside air to increase the filling efficiency. , Increase confidentiality.

  This confidentiality results in an increase in the reliability of the electrical connection portion by preventing oxidation of the brazed portions of the capacitor element 30 and the connection terminals 15 and 16. The chip capacitor element 30 is preferably a chip ceramic capacitor element. The capacitor case is preferably molded mainly from PBT (polybutylene terephthalate) resin, and the resin to be filled is preferably an epoxy resin.

  12 and 13 show the appearance of the capacitor device manufactured according to the present invention. FIG. 12 shows the surface, and the hollow portion 13 is a mold sealing region. Further, according to FIG. 13 on the back surface, the through hole 19 is a mold region in addition to the hollow portion 14. That is, the back mold area is narrower than the front mold area and has a plurality of mold areas. Further, the mold region inside the capacitor device manufactured according to the present invention is in communication, and the capacitor element is in the mold region on the front side. Further, the external connection terminal has a feature of appearance or internal structure in that it is taken out from the side having a plurality of mold regions.

  According to the present invention, since the state of brazing of capacitors and electrodes can be visually observed in the manufacturing process, a high-quality and high-performance capacitor device can be obtained, so that it can be widely applied not only to motor devices but also to a wide range of products. can do.

1: Motor 2: Casing 3: Magnet 4: End bracket 5: Rotor 6: Shaft 7: Bearing 8: Commutator 9: Brush 10: Brush holder 11: Brush base 12: Chip type capacitor device 13, 14: Hollow part 15 : Capacitor case 16: Connection terminal 17: Ground terminal 16a, 17a: External extraction part 16b, 17b: Internal connection part 18: Base part 19: Through hole 20: Hole 21: Mold resin (epoxy)
30: Chip-type capacitor elements 31, 32: Electrodes 33, 34: Earth terminal 35: Exhaust air 40, 41, 42: Brazing part 50: Mounting table

Claims (8)

  The one side and the other side of the rectangular parallelepiped case communicate with each other and are mold-sealed. Inside the one side, the chip-type capacitor and the welded portion of the external connection terminal are welded. A capacitor device characterized by being narrower than a mold region on one side and having a plurality of mold regions on the other side.   2. The capacitor device according to claim 1, wherein the external connection terminal is led from the other surface side.   The one surface and the other surface communicate with each other through a hollow portion, the one surface side hollow portion is wider than the other surface side hollow portion, and the one surface side hollow portion communicates with the other surface side hollow. A rectangular parallelepiped case having a through-hole that does not communicate with the part, an external connection terminal for an electrode for guiding a welded portion to a base portion formed by the large and small hollow portions, and leading an external extraction portion outside the rectangular parallelepiped case, An external connection terminal for ground that leads a welded portion to a portion where the hollow portion is in contact and leads an external extraction portion outside the rectangular parallelepiped case, provided in the hollow portion on the one surface side, and the terminal is welded to the external connection terminal A capacitor device comprising a capacitor element welded to each portion and a resin filled in the hollow portion.   The one surface and the other surface communicate with each other through a hollow portion, the one surface side hollow portion is wider than the other surface side hollow portion, and the one surface side hollow portion communicates with the other surface side hollow. Use a rectangular parallelepiped case having a through-hole that does not communicate with the part, lead the welded part to the base part formed by the large and small hollow parts, and provide an external connection terminal for the electrode that guides the external extraction part outside the rectangular parallelepiped case Attach, connect the large and small hollow parts to the welded part, attach an external connection terminal for grounding that leads the external extraction part outside the rectangular parallelepiped case, and install the capacitor element in the hollow part on the one side A capacitor device manufacturing method in which the terminal is welded to a welded portion of the external connection terminal, and the hollow portion is filled with resin. In the method for manufacturing a capacitor device according to item 4,
Capacitor device characterized in that welding operation of terminal of capacitor element and external connection terminal is carried out in hollow portion on one surface side, and welding operation and welding result are monitored from hollow portion on the other surface side. Manufacturing method. In the method for manufacturing a capacitor device according to item 4,
When filling the hollow part with resin, the rectangular parallelepiped case is placed on a mounting table with the hollow part on one side facing down, and the resin is filled from the hollow part on the other side. Manufacturing method for capacitor device. In the method for manufacturing a capacitor device according to claim 6,
A method of manufacturing a capacitor device, wherein when the resin is filled in the hollow portion, the through hole is used as an air vent hole.
In the method for manufacturing a capacitor device according to claim 5,
After monitoring the welding operation and the welding result, placing the rectangular parallelepiped case on the mounting table with the hollow portion on one side facing down, and filling the resin from the hollow portion on the other surface side A method of manufacturing a capacitor device.

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