JPH0214196Y2 - - 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 each of the parts 5, 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 shown in the previous figure, but the shape and dimensions of the frame 25 are slightly different from those shown 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. Applying ultraviolet curable resin to the internal element 31 with its internal terminals 32 exposed, and irradiating ultraviolet rays to quickly cure the resin to form a sealing layer 33;
This is used to construct a chip-type aluminum electrolytic capacitor.

As mentioned above, conventional chip-type aluminum electrolytic capacitors have a driving electrolyte that is impregnated into the internal elements, so either the internal elements are sealed in an aluminum case or the internal elements are molded. After being twisted 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 present invention was made based on the above-mentioned circumstances, and its purpose 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 base having a locking pawl that engages with the constriction and a through hole for inserting the lead wire in the bottom of the recess; the lead wire is inserted into the through hole, the bottom of the case is engaged with the recess, and the locking pawl engages the base. a locked cylindrical aluminum electrolytic capacitor; and a groove 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 and accommodating a bent lead wire. It is characterized by having the following.

[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 a lead wire 2,
This is a cylindrical aluminum electrolytic capacitor having 3 on the same end surface, and there is a crimping constriction 4 on the lower end circumferential surface of the case, which is created when a rubber sealing plug is crimped. The base 5 is a 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 locking pawl 7 provided on its circumferential surface that engages with the caulking constriction 4. have
In addition, the bottom of the recess has a through hole 8 for inserting the lead wire,
9 (Fig. 1 B, C). moreover,
On the lower surface of the base 5, there is a groove 1 located on a line connecting the through holes 8 and 9 and extending from each through hole to the nearest edge of the base.
0 and 11 are provided (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.
Incidentally, at this time, if a resin is applied to the rubber plug part of the case and cured after bonding, the above-mentioned two 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 poles of the lead wires 2 and 3, a mark is placed on the top surface of the case by printing or the like, or a mark is placed by cutting off a corner of the base 5, as shown in FIG. 1A.

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. Further, since there is no need to weld lead wires and there is no need for molding, manufacturing is simple and costs are low. moreover,
If the base is made of a material with high heat resistance and low thermal conductivity, it is advantageous when mounting using a reflow method or the like.

[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, the polarity can be easily determined by either or both of the marks printed on the top of the case and the marks cut off at the corners of the base.
Implementation can be automated.

[Brief explanation of drawings]

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 through 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 neck, 5 ... Base,
6...Circular recess, 7...Lock claw, 8, 9...
Through hole, 10, 11...groove.

Claims (1)

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