JPH0227558Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a chip-type aluminum electrolytic capacitor.

[Technical background of the invention and its problems] The structure of a conventional chip-type aluminum electrolytic capacitor is as follows.

FIG. 2 shows two lead wires 21, 2.
2 is constructed using a cylindrical capacitor provided on the same end surface of the case 23, and frames 24 and 2 are constructed of solderable metal plates.
Lead wires 21 and 22 are electrically or ultrasonically welded to 5, respectively, and the whole is molded with thermosetting resin. In the figure, 26 indicates a mold.

FIG. 3, in which the same parts as in FIG. 2 are denoted by the same reference numerals, shows a structure using a capacitor with lead wire terminals in opposite directions. This chip type aluminum electrolytic capacitor has almost the same structure as the one in the previous figure, but the shape and dimensions of the frame 25 are slightly different from those in the previous figure.

FIG. 4 shows a chip-type aluminum electrolytic capacitor constructed using internal elements of a capacitor. A mold 28 having fine communication holes is applied to the internal element 27 which is not impregnated with the driving electrolyte, the internal element is impregnated with the driving electrolyte under reduced pressure, and the communication holes are sealed by heat or the like. internal terminal 29,
30 is welded to frames 24 and 25, and a mold 26 is applied to the entire structure.

FIG. 5 shows a chip-type aluminum electrolytic capacitor using internal elements impregnated with a driving electrolyte. An ultraviolet curable resin is applied to the internal element 31 with its internal terminals 32 exposed, and is rapidly cured by irradiating ultraviolet rays to form a sealing layer 33, which is used to construct a chip-type aluminum electrolytic capacitor. There is.

As mentioned above, in conventional chip-type aluminum electrolytic capacitors, the internal elements are impregnated with a driving electrolyte, so the internal elements are either sealed in an aluminum case or the internal elements are simply molded. After being wrapped and covered, it is further molded. Therefore, there was a drawback that the external dimensions were large compared to the capacitance of the capacitor. Furthermore, the manufacturing process is complicated and time consuming, such as welding the lead wires and the frame, resulting in high costs.

[Purpose of the invention] The invention was created based on the above circumstances.
The object of the present invention is to obtain a chip-type aluminum electrolytic capacitor that has a simple structure and is easy to manufacture.

[Summary of the invention] The chip-type aluminum electrolytic capacitor of the present invention has a circular recess that engages the bottom of the case of a cylindrical aluminum electrolytic capacitor on one surface, and a cylindrical recess that is provided on the circumferential surface of the recess and that forms a contour on the lower end of the case. A ceramic base has a locking claw that engages with the constriction and a through hole for inserting the lead wire in the bottom of the recess, and the lead wire is inserted into the through hole and the bottom of the case is engaged with the recess and locked. A cylindrical aluminum electrolytic capacitor held by a claw, and a bent lead wire provided on the line connecting the through holes on the other side of the base from each through hole to the nearest edge of the ceramic base are accommodated. It is characterized in that it has a groove.

[Embodiment of the invention] FIG. 1A is a perspective view showing an embodiment of the invention in an exploded state. In this figure, 1 is the lead wire 2, 3
This is a cylindrical aluminum electrolytic capacitor which has a cylindrical aluminum electrolytic capacitor on the same end surface, and there is a tightening constriction 4 on the lower end circumferential surface of the case, which is created when tightening a rubber plug for sealing.
The base 5 is a ceramic molded body, and has a circular recess 6 on its upper surface that engages the lower end of the case of the cylindrical aluminum electrolytic capacitor 1, and a lock pawl 7 provided on its circumferential surface that engages with the caulking constriction 4. has. Further, through holes 8 and 9 for inserting lead wires are provided at the bottom of the recess (FIGS. 1B and 1C). Further, on the lower surface of the base 5, there is a groove 10 located on a line connecting the through holes 8 and 9 and extending from each through hole to the nearest edge of the base.
11 (Fig. 1 B, C).

Lead wire 2 of cylindrical aluminum electrolytic capacitor 1,
3 into the through holes 8 and 9 of the base 5, and push the capacitor 1 into the recess 6 of the base 5, the lock claw 7
engages with the caulking constriction 4, and the two are connected.
At this time, if a resin is applied to the rubber plug part of the case and cured after bonding, the two parts will be completely fixed.

Thereafter, each lead wire 2, 3 is crushed to a width and thickness corresponding to the width and depth of the grooves 10, 11, bent along the grooves 10, 11, and the portion protruding from the base 5 is cut.

In order to distinguish between the positive and negative electrodes of the lead wires 2 and 3, mark them by printing on the top of the case as shown in Figure 1A, or cut off the corners of the base 5 before sintering the ceramic. After that, it is sintered and marked.

The chip-type aluminum electrolytic capacitor of the present invention having the above structure does not have a double structure unlike conventional capacitors, so its external dimensions do not increase. Furthermore, there is no need to weld lead wires and there is no need for molding, so manufacturing is simple and costs are low.

[Effects of the Invention] The chip-type aluminum electrolytic capacitor of the present invention not only can be constructed in a small size, but also can be supplied at a low price. In addition, since the polarity can be easily determined by either or both of the marks printed on the top surface of the case and the marks cut off at the corners of the base, the mounting can be automated.

Furthermore, ceramic has good heat conductivity, and in the case of a solder reflow method, the temperature of the surrounding ceramic rises quickly, so the solder adheres to the lead wire quickly and cools down quickly when finished. It is also possible to dip only the base portion of the solder dip.

[Brief explanation of the drawing]

1A is a perspective view showing an exploded state of one embodiment of the present invention; FIG. 1B is a perspective view of the embodiment seen from below; FIG. 1C is a front view showing a part of the embodiment in cross section; 5 are schematic perspective views of four types of conventional chip-type aluminum electrolytic capacitors. 1... Cylindrical aluminum electrolytic capacitor, 2, 3...
... Lead wire, 4 ... Caulking constriction, 5 ... Ceramic sintered body base, 6 ... Circular recess, 7 ... Lock pawl, 8, 9 ... Through hole, 10, 11 ... Groove.

Claims (1)

[Scope of utility model registration request] One side has a circular recess that engages the bottom of the case of a cylindrical aluminum electrolytic capacitor, and a locking claw that is provided on the circumference of this recess and engages with the caulking constriction on the lower end of the case. The cylindrical aluminum electrolytic capacitor includes a base made of a ceramic sintered body having a through hole for inserting a lead wire, and a cylindrical aluminum electrolytic capacitor in which the lead wire is inserted into the through hole, the bottom of the case is engaged with the recessed part, and the capacitor is locked by a locking claw. and a groove for accommodating a bent lead wire, which is provided on the other surface of the base on a line connecting the through holes from each through hole to the nearest edge of the base. Electrolytic capacitor.