JPS5830121A - Polar chip electronic part - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polar step board electronic component, and particularly to its external electrode structure.

Electrolytic capacitors are electronic components with polarity.

There are diodes, etc. For example, to explain an electrolytic capacitor, the dielectric film of an electrolytic capacitor is formed by attaching a valve metal wire tube R19 to the anode of a valve metal such as aluminum or tantalum, and then placing the valve metal wire in an electrolytic solution such as an aqueous sulfuric acid solution. is formed by anodizing means as an anode.

The dielectric film formed in this way has a rectifying effect, so if it loses its role as an electrolytic capacitor, the valve metal wire can be used as an anode, and a counter electrode made of manganese dioxide, graphite, silver paste, etc. The electrode must be used as a cathode.

Therefore, if the electrolytic capacitor itself is connected to a circuit with reversed polarity, it will not only be catastrophically damaged, but also
Thermal damage may also occur to associated electronic components.

In order to solve this reverse connection mounting, conventionally, as shown in FIG. The polarity was determined using magnetic material 41t.

However, in order to perform high-speed mounting using automatic mounting equipment, it is necessary to align the polarity of the chip-type electrolytic capacitors in advance and pack them with equal pressure on magazines or cartridge tapes. Conventional means require a large amount of man-hours for this arrangement, and A new array device had to be developed. Furthermore, even if the arraying device 11t for aligning the polarities is used, there is no guarantee that there will be no reverse connection mounting, so it is necessary to confirm whether the polarity after mounting is appropriate. Also,
With regard to diodes, the demand for chip-type diodes has increased with the recent trend toward high-density mounting, but they essentially have the same problems as chip shop electrolytic capacitors, and high-speed mounting is essential for high-speed mounting. This has become a major obstacle to the development of society.

An object of the present invention is to provide a polarized chip-type electronic component that solves the drawbacks of the conventional polarized chip-type electronic component.

According to the present invention, both end faces of a polarized step-type electronic component, i9, have a pair of external electrodes on both end faces and a part of the curved surface adjacent to the both end faces, and one on every eight of the pair of external electrodes. A polarized tip-type electronic component characterized in that it is provided with three or more external electrodes is obtained.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5 regarding a tantalum solid electrolytic capacitor. [Example 1] FIG. 2 shows an embodiment of the present invention, and 4 is an external view. (II shows a vertical cross-sectional view. An anode body 2 made by planting tantalum lead Ml on tantalum powder and molding it into a desired shape is formed around the tantalum pentoxide t-anode body L by means of anodization. 〇After that, add this anode body 2 to the manganese nitrate solution.
After immersing the substrate, manganese nitrate was thermally decomposed in a hot atmosphere at a temperature of 250° C. to form manganese dioxide. This process was repeated multiple times to form a manganese dioxide layer. Further, a graphite layer and a silver paste layer are sequentially formed using conventional well-known techniques to form a capacitor element (hereinafter abbreviated as element) 2.
was formed. Thereafter, as shown in FIGS. 2(5) and (b), a part of the tantalum lead wire 1 and two opposing cathode parts 2 are
The surface of the element 20 was covered with a thermosetting epoxy resin to form an insulating portion 5t so as to expose it to heat.

After that, the tantalum lead was exposed! By mechanically rubbing the surface of 1, the tantalum 95 oxide formed on the surface of the tantalum lead wire 1 was removed.

Next, tantalum lead wires 1 and 1 protruding from the insulation part 5
The band-shaped anode part 4 and the cathode part 28.2b'ft which surround the insulating part 50 in a ring shape are formed as follows.
Cathode part 2a with exposed Ryoru surface.

After pasting masking tape on a part of the insulating part 5 except for the area where the anode part 2b and the anode part 3 are formed, a cap-shaped cathode part 4.4' and a band-shaped anode part s3 are formed by electroless copper plating. Square column chip type mental solid electrolytic capacitor formed in a ring shape and having three electrodes? was created.

[Example 2] Fig. 3 4, @ shows two tantalum leads @ la, 1 b after molding the tantalum metal powder.
11R9, a cap-shaped cathode 1ft14, 4' and a band-like width anode part 3 in the same way as in the manufacturing method of Example 1 described above.
This is a square columnar chip type solid tantalum electrolytic capacitor having four electrodes in which a and 3b are formed into a ring shape.

[Example 3] Figure 4 4, @ shows that after molding tantalum metal powder, the tantalum lead parts 01 are projected and attached to the opposing surfaces of the molded body, respectively, and a cap is formed in the same manner as in the manufacturing method of the previous example. shaped OS pole part 13.13' and strip-shaped cathode part 14t-
This is a square columnar chip type solid tantalum electrolytic capacitor containing three electrodes formed in a ring shape.

[Embodiment 4] FIGS. 5(5) and 5(b) show a quadrangular columnar chip type solid tantalum electrolytic capacitor having four electrodes in which a ring-shaped cathode portion with a band-like width is newly added to the structure of Embodiment 3.

It is more preferable to cover the band-shaped electrode formed by the copper electroless plating method in this example with solder after formation to prevent oxidation of the copper surface. Forming electrodes on some parts will further strengthen the bonding to the printed circuit board. Although the external electrodes were formed by electroless plating of copper ore in this example, they are not limited to copper in any way; for example, they may be formed by electroless plating of metals such as tin, nickel, etc. that can be coated on a day-to-day basis. . Further, in addition to the electroless plating method, it may be formed using a metal ion plating method, a sputtering method, a vacuum evaporation method, a conductive adhesive, a metal cap-shaped terminal, or the like.

Furthermore, the shapes of chip-type electrolytic capacitors include not only square prisms but also polygonal prisms such as triangular prisms and pentagonal prisms, cylinders, Sui cylinders, etc.
It goes without saying that a plate-like type or the like may also be used.

As described above, according to the method of the present invention, a pair of electrodes are provided on both end surfaces of the element,
Since 11 of them has one or more opposing electrodes, there is no error in polarity discrimination. Therefore, there is an advantage that the same arrangement *'' as used for non-polar electronic components such as resistors and ceramic capacitors can be used without requiring any ingenuity in the arrangement method.Furthermore, the electrode section has opposing electrodes not only on both end surfaces but also on the inside thereof. Therefore, the inductance of the electrode portion is reduced, and the impedance characteristics at high frequencies are improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional chip type electrolytic capacitor in which the cathode part and the anode part have different shapes. Fig. 1 (II is a perspective view of a chip-type electrolytic capacitor in which the cathode part is made of a magnetic material according to a conventional example. The anode part is made of a non-magnetic material. Fig. 2 4, @ has a pair of cathode parts on both end faces A perspective view and a vertical cross-sectional view of a chip type electrolytic capacitor that has one anode part on its inside. Figure 3 (5), @ has a pair of cathode parts on both end faces. A pair of anode parts on its inside. A perspective view and a longitudinal cross-sectional view of a chip-type electrolytic capacitor having a pair of anode portions on both end faces and a cathode portion inside the anode portion. Top view. The fifth section (b) has a pair of anode parts on both end faces. A perspective view and a vertical cross-sectional view of a chip type electrolytic capacitor containing a pair of cathode parts inside 0 1@1!@lb@ 1lalllb-・-Lead wire to 7/. 2-----・Condenser?Element%3.3JII3b@1
3f13'・-・-・Anode part%4.4', 1114J
l@14b...-Cathode part, 5...-Insulating part. Agent: Susumu Uchihara, patent attorney
B) 3rd Father 6t Tsume-/lfノ(f)/-nott-ノ(f)

Claims (1)

[Claims] A polar chip electronic component has a pair of external electrodes on both end surfaces, or both end surfaces and a part of the peripheral surface adjacent to the both end surfaces, and one or more external electrodes are placed inside the pair of external electrodes. Did you set it up? Features a polarized nap-reducing electronic component.