JPS605565Y2 - Chip solid electrolytic capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a face-pond type solid electrolytic chip capacitor, and particularly relates to polarity discrimination thereof.

Recently, as the miniaturization and automatic insertion of electronic circuits have progressed, there has been a demand for electronic components to be made into chips. and so on.

Since these chip components have no polarity and use ceramic substrates, they can be easily manufactured with high dimensional accuracy into a rectangular shape suitable for automatic alignment and automatic supply.

On the other hand, solid electrolytic capacitors are polar, so
It is difficult to manufacture rectangular shapes suitable for automatic alignment and automatic supply with high dimensional accuracy, and various studies and developments are being carried out by capacitor manufacturers.

The present inventors also conducted various studies to enable automatic alignment and automatic supply of solid electrolytic capacitors, and as a result, they developed and previously proposed a chip-shaped solid electrolytic capacitor having the following structure.

Figures 1a, b, and c show a solid electrolytic capacitor according to an embodiment of the present invention. It is constructed by sequentially laminating a semiconductor layer such as manganese dioxide, a cathode layer such as carbon, and a cathode conductive layer such as silver paint or solder on a dielectric oxide film on the surface of an anode body made of a sintered body of metal powder. ing.

A protruding lead-in wire 2 made of the same material as that of the anode body is drawn out from the anode body of the capacitor element 1.

3 is a raised part made of resin such as epoxy resin, which is built up at the base of the protruding lead-in wire 2 of the capacitor element 1;
This raised portion 3 is formed in an arc shape on the end face of the capacitor element 1.

Reference numeral 4 denotes an anode terminal which is connected to the protruding lead-in wire 2 of the capacitor element 1 by welding in contact with a part of the surface of the raised part 3, and this anode terminal 4 is made of a prismatic or cylindrical metal member such as iron or nickel. It consists of

Reference numeral 5 denotes a resin layer filled between the end face of the capacitor element 1 and the anode terminal 4, and this resin layer 5 is made of a resin having adhesiveness and heat resistance such as epoxy, silicone, or phenol. It is formed by filling the surface of the raised portion 3 of No. 1 and between that surface and the surface of the anode terminal 4.

6 is a cathode terminal, and this cathode terminal 6 is connected to the capacitor element 1.
It is formed by coating the end opposite to the protruding lead-in line 2 side with solder, paint, or the like.

7 is a capacitor element 1 between the cathode terminal 6 and the anode side.
This resin layer 7 is a resin layer such as an epoxy resin that covers the surface of the intermediate part of the body, and if there is a conductive part of the electric circuit in the lower part of the body between the anode terminal 4 and the cathode terminal 6, the resin layer 7 is used to connect the anode terminal 4 and the cathode terminal 6. It serves to insulate the terminal 6 and also serves to protect the capacitor element 1.

Therefore, it is desirable that the length of this resin layer 7 be as long as possible, but if the length is increased, the width between the anode terminal 4 and the cathode terminal 6 will become shorter, and when a capacitor is attached, the connection strength will be weakened. Therefore, it needs to be an appropriate length.

Here, the anode terminal 4 and the cathode terminal 6 are located on the same plane, and the bottom of the main body is a uniform plane with no unevenness from the bottom surface of the anode terminal 4 to the bottom surface of the cathode terminal 6, This enables automatic alignment and automatic supply.

Note that in order to enable automatic alignment and automatic supply by the parts feeder, the upper and lower surfaces of the resin layer 7 need only be smooth surfaces.

Furthermore, when attaching to an electronic circuit board, a thin layer of adhesive is applied onto the board by screen printing or the like, and after the lower surface of the resin layer 7 is bonded and fixed to the adhesive, the anode terminal 4 is attached by solder dipping. This can be easily done by connecting the cathode terminal 6 to a conductive part on the substrate.

Also, at this time, unless the surface of the resin layer 7 is smooth, sufficient temporary fixation with the adhesive cannot be achieved.

As is clear from the above structure, this chip-shaped solid electrolytic capacitor has a raised part 3 made of resin formed at the base of the protruding lead-in wire 2 of the capacitor element 1, and the raised part 3 connects the anode terminal 4 to the capacitor element. 1 and connected to the protruding lead-in wire 2, the root portion of the protruding lead-in wire 2 at the end face of the capacitor element 1 is reinforced by the raised portion 3, and the anode terminal 4 is connected to the protruding lead-in wire 2 by welding. In this case, the influence of mechanical stress can be extremely reduced, and the anode terminal 4 can be brought as close to the capacitor element 1 as possible.

Furthermore, the lengths of the anode terminal 4 and cathode terminal 6 are approximately the same as the width of the main body, and the widths of the anode terminal 4 and cathode terminal 6 are also approximately the same, and the width of each terminal is the same as that of the completed capacitor. Since the length is 1/3 to 115 of the total length, the strength of each terminal connected to the conductive portion on the substrate will not be weakened.

Further, as other embodiments of the solid electrolytic capacitor having such a structure, structures shown in FIGS. 2 to 5 may be considered.

In the embodiment shown in FIG. 2, a cylindrical metal member is used for the anode terminal 4, and in the embodiment shown in FIG.
The flat surface of the anode terminal 4 connected to the protruding lead-in wire 2 is covered with the resin layer 5, and in this case, the anode terminal 4 can be held more firmly.

Further, in the embodiment shown in FIG. 4, a main anode terminal 4a and a lower terminal 4b are used, and the main anode terminal 4a and the lower terminal 4b are connected so that the protruding lead-in wire 2 is sandwiched between them. It is possible to eliminate the front and back directionality on the anode side, thereby increasing the degree of freedom in mounting.

Furthermore, in the embodiment shown in FIG. 5, improvements have been made to the embodiment shown in FIG. A concave groove 8 is provided in the anode terminal, thereby increasing the gap between the root part of the protruding lead-in wire 2 and the connection part between the protruding lead-in wire 2 of the anode terminal and reducing stress during welding of the anode terminal. It is possible to reduce the influence of

As described above, according to the chip-shaped solid electrolytic capacitor devised by the present inventors, only the necessary parts are covered with resin, making it possible to produce a chip-shaped solid electrolytic capacitor that is small and capable of automatic alignment and automatic supply at low cost. Furthermore, it is possible to obtain a face-ponting type chip-shaped solid electrolytic capacitor of high practical value, which is easy to attach to a substrate and has sufficient connection strength.

By the way, in the embodiments shown in FIGS. 1, 2, and 3, the anode and cathode can be distinguished by their shapes, but in the embodiments shown in FIGS. 4 and 5, In this case, the anode and cathode sides had the same shape and were completely rectangular parallelepipeds, so it was not possible to determine the polarity.

Further, even in the case of the embodiment shown in FIG. 3, when the thickness of the resin layer 5 formed on the anode terminal 4 becomes thick and the shape becomes a rectangular parallelepiped, it becomes impossible to distinguish between the front and the back.

The present invention was developed in view of these problems, and will be described below with reference to the drawings of FIGS. 6 to 15 showing embodiments of the present invention.

The basic idea of this invention is to utilize the difference in brightness between bright colors and dark colors, and detect the difference in brightness using a photocoupler consisting of a phototransistor and a light emitting element. This is used to determine the polarity and the front and back sides of the FM capacitor.

Specifically, a difference in brightness is provided between the anode side and the cathode side by color, with the central part of the rectangular parallelepiped or cylindrical main body in at least one of the length and width directions as the border, as described below. There are various embodiments.

[Example 1] As shown in FIG. 6, the resin layer 7 is formed so as to have a difference in brightness at the longitudinal center of the main body portion 9 of the chip solid electrolytic capacitor, which is formed into a rectangular parallelepiped shape with the above-described structure. A color display portion of A color and B color is formed on the surfaces of the anode terminal 10 and the cathode terminal 11.

In this case, the color display section is only on the surface of the main body part 9, and the color A and B are displayed.
The area for both colors is 172 of the total area of the color display section.

In addition, as a modification of the first embodiment, a color display section may be formed only on the surface of the resin layer 7 as shown in FIG. It is conceivable to form a color display section.

Furthermore, as shown in FIGS. 9 and 10, it is conceivable to form color display portions not only on the surfaces of the resin layer 7, anode terminal 10, and cathode terminal 11, but also on both side surfaces and the back surface.

In this case, the color display portions will also be on the front and back surfaces and both side surfaces of the main body portion 9.

By the way, as a combination of colors to create a difference in brightness,
There are combinations of white colors with high brightness and black colors with low brightness, but in order to ensure detection, it is better to use a combination of a color with a brightness of 7.5 or more and a color with a brightness of 4.5 or less.

Further, as the paint, a general resin paint mixed with a pigment or a colorant, a fluorescent paint, or a luminescent paint may be used.

In addition, in the case of the chip-shaped solid electrolytic capacitor according to the present invention, the anode terminal 10 and the cathode terminal 11 are made of metal such as silver, solder, tin, lead, etc., and their brightness is relatively high, so they have a brightness close to that of the metal. It is preferable to use color on one side.

That is, when solder is used for both the anode terminal 10 and the cathode terminal 11, white with high brightness may be used as the A color, and black with low brightness may be used as the B color.

Furthermore, when displaying two colors with different brightness, the larger the area of each, the more reliable the detection, but the area is at least 174 or more of the total area of a certain - surface, in other words, 1 = 4. If there is a difference in the area of the ratio, detection can be performed reliably.

Further, the color of the resin layer 7 may be used as one of the colors.

[Example 2] As shown in FIG. 11, the color of the cathode terminal 11 is used as one of the B colors 1, and a color display portion of A color with low brightness is formed on the surface other than the cathode terminal 11.

In this embodiment, since the metal color of the cathode terminal 11 is B color, it is easy to form the color display section.

[Example 3] As shown in FIG. 12, the resin layer 7 and the anode terminal 1 are arranged so as to have a difference in brightness with the central part of the main body part 9 in the width direction as a border.
A color display portion of A color and B color is formed on the surfaces of the cathode terminal 11 and the cathode terminal 11.

Further, the area of color A and color B is I/2 of the total area of the color display section.

In this embodiment, discrimination can be made depending on whether color A or color B is on the right or left side when facing.

[Example 4] As shown in FIG. 13, a color display portion of A color and B color is formed on one side surface so as to have a difference in brightness with the longitudinal center of the main body portion 9 as a boundary. .

In this case, the color display portion will be on the side surface. [Example 5] As shown in FIG. 14, a color display area of color A is formed in a 1/4 area area of the surface of the main body part 9 divided by the center in the longitudinal direction and the width direction. .

In this case, the color display section is only on the surface of the main body portion 9, and the area of color A is 1/4 of the total area of the color display section.

[Example 6] All of the above examples are cases of chip-shaped solid electrolytic capacitors having a rectangular parallelepiped shape, but when a column-shaped anode substrate is used, a column-shaped chip solid electrolytic capacitor is obtained.

This embodiment is an example in which the resin layer 7 has a cylindrical shape, and as shown in FIG. A color display section is formed by the color.

In this case, the color display portion becomes the outer peripheral surface of the main body portion 9.

As is clear from the above description, the present invention is designed to perform polarity discrimination and front/back discrimination of rectangular parallelepiped or cylindrical chip solid electrolytic capacitors suitable for automatic supply and automatic alignment using the following configuration. It has an effect.

(1) Since polarity is displayed by the difference in brightness, it can be automatically and easily distinguished using a phototube or photocoupler.

(2) By forming the color display portion on only one side, it is possible to distinguish between the front and back sides.

(3) Due to the effects of (1) and (2), polar chip solid electrolytic capacitors can be automatically supplied, the polarity can be automatically determined during automatic alignment, the front and back sides can be determined automatically, and the orientation can be aligned. This can be done automatically, and attachment to a printed circuit board can also be done automatically.

(4) Since it has a rectangular parallelepiped or cylindrical shape, compared to those with external lead wires, by using color display as in the present invention, it is possible to visually distinguish the part feeder during automatic feeding.

[Brief explanation of drawings]

Figures 1a, b, and c are perspective views, top views, and cross-sectional views showing chip solid electrolytic capacitors according to the present invention, Figures 2 to 5 are perspective views showing different examples, and Figure 6. ~
FIG. 15 is a perspective view showing a solid electrolytic capacitor according to an embodiment of the present invention. 7...Resin layer, 9...Body part, 1o
... Anode terminal, 11 ... Cathode terminal.

Claims (3)

[Scope of utility model registration request] (1) It has a rectangular parallelepiped or cylindrical main body portion with an anode terminal and a cathode terminal at both ends in the longitudinal direction and a middle portion covered with a resin layer, and at least one of the longitudinal direction and the width direction of the main body portion. A color display area of two or more colors, a color with a brightness of 7.5 or more and a color with a brightness of 4.5 or less, is formed on the main body part with the central part as a boundary, and an area of at least one color of the color display part. A chip-shaped solid electrolytic capacitor that takes up 174 to 1/2 of the total area of the color display area. (2) The chip-shaped solid electrolytic capacitor according to claim 1, wherein the anode terminal or the cathode terminal has a metallic color with high brightness. (3) The chip-shaped solid electrolytic capacitor according to claim 1, in which the color display portion is formed only on the surface of the main body portion.