JPH0249706Y2 - - Google Patents

Description

[Detailed explanation of the idea]

INDUSTRIAL APPLICATION FIELD The present invention relates to an electrolytic capacitor having lead wire terminals. Conventional technology In general, lead wire terminals for electrolytic capacitors are made of iron wire or copper wire coated with copper and plated with metal on the outer periphery (hereinafter referred to as CP wire) or metal-plated copper wire. It is connected to a bar-shaped aluminum tab or T-shaped aluminum rivet by arc welding, resistance welding, etc. For example, in the case of an electrolytic capacitor, as shown in FIG. 4, each lead tab 6 is connected to an anode electrode foil by caulking or the like, and then wound through a separator such as electrolytic paper to form a capacitor element 7.
This is impregnated with an electrolytic solution, and a T-shaped rivet 5 with a CP wire 4 welded to its head as shown in FIG.
The lead tab 6 is crimped using a crimper, and the capacitor element 7 is housed in a case 11 and sealed. Problems to be solved by the invention In the conventional technology as described above, when welding the CP wire 4 to the rivet 5, it is cut to a predetermined length as shown in Fig. 5, and the cut end is attached to the rivet 5. When welding to the head 5a, since the copper layer 2 coated on the iron wire or copper wire 1 is as thin as 3 to 6% of the wire diameter D, welding may fail due to variations in welding conditions. The wires were completely disconnected, burrs 4a were generated as shown in FIG. 6A, and molten lumps 4b were generated as shown in FIG. 6B. In particular, for electrolytic capacitors with a diameter of 22 mm or more and a length of 40 mm or more, copper wire is vulnerable to vibration and shock, so the wire diameter is 0.8 to 1.2 mm.
A relatively thick CP wire (mm) is used, but due to the large wire diameter, many of the problems described above have occurred. Therefore, if welded and attached to the printed circuit board 12 under the conditions shown in Fig. 6 (b), the molten mass 4 will form as shown in Fig. 4.
There was a problem in that the end face of the case 11 was lifted up when the part b came into contact with the printed circuit board 12, making the installation unstable. Means for Solving the Problems The present invention solves the above problems by passing a T-shaped aluminum rivet with a lead wire welded to the head through the sealing plate and connecting it to a lead tab led out from the capacitor element. , in an electrolytic capacitor in which the capacitor element is housed in a case and sealed, the top of the T-shaped aluminum rivet is coated with 10 to 40% of the wire diameter D on the copper wire or iron wire.
This is an electrolytic capacitor characterized by welding a copper layer having a thickness of t and a lead wire having a solder plating layer thereon. Function Since the copper layer 2 and the solder plating layer 3 are formed with a thickness t of 10% to 40% of the wire diameter D of the CP wire 4, when the CP wire is cut, there will be some damage on the cut end surface as shown in Figure 2. Copper coated. Therefore, when welding to the head 5a of an aluminum rivet, an alloy layer 5b of aluminum and copper is formed, which increases weldability, and allows stable welding without generating wire breaks, burrs, or molten lumps. Example In a well-known electrolytic capacitor as shown in Fig. 4, the thickness of the copper layer of the CP wire was varied to create a rated 50V,
A 6800μF, case size 25mm in diameter and 50mm in length was manufactured, and vibration and sound quality tests were conducted along with conventional products of the same rating. The vibration test was conducted in accordance with JIS C 5102 Section 8.2 Type A, and was conducted for 1 minute at a vibration frequency of 10 to 55 to 10 Hz as one cycle, with a total amplitude of 1.5 mm in three directions perpendicular to each other for 2 hours each for a total of 6 hours. We also used it in the power supply circuit of audio equipment to evaluate the sound quality. The results of these tests are shown in the table.

[Table] Sample group symbols A and B in the table are conventional products, C, D, E,
F is a product of the present invention, and G is a sample for comparison. Compared to conventional products, the copper layer thickness t of this product is 10 to 40% thicker than the wire diameter D, resulting in stable spot welding and significantly improved strength. It has been demonstrated that because there is less magnetic material, the sense of distortion is reduced and the sense of volume in bass sounds appears. Effects of the invention As described above, the electrolytic capacitor of this invention has remarkable features such as no burrs or molten lumps in the welded parts, stable fixation, strong resistance to vibration and impact, and expanded use for audio equipment. be effective.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the manufacturing process of the electrolytic capacitor lead wire of the present invention, where A is before welding, B is after welding, Figure 2 is a cross-sectional view of the main part of the lead wire before welding, and Figure 3 is a cross-sectional view of the main part of the lead wire before welding. The figure is a perspective view of a conventional electrolytic capacitor lead wire, Figure 4 is a cross-sectional view of a conventional electrolytic capacitor attached to a printed circuit board, and Figure 5 is a cross-section of the main part of a conventional electrolytic capacitor lead wire before welding. FIG. 6 is an explanatory view of the manufacturing process of a conventional lead wire for an electrolytic capacitor, with A being before welding and B being after welding. 1: Iron wire or copper wire, 2: Copper layer,
3: Solder plating layer, 4: Lead wire, 5: T-shaped aluminum rivet, 5a: Head, 6: Lead tab, 7: Capacitor element, 8: Case.

Claims (1)

[Scope of utility model registration request] In an electrolytic capacitor, a T-shaped aluminum rivet with a lead wire welded to the head is passed through a sealing plate and connected to a lead tab led out from a capacitor element, and the capacitor element is housed in a case and sealed. On the head of the shaped aluminum rivet, on the copper wire or iron wire,
An electrolytic capacitor characterized by welding a copper layer having a thickness of 10 to 40% and a lead wire having a solder plating layer thereon.