JPH03167813A - Metallized film capacitor - Google Patents

Abstract

PURPOSE:To improve the positional accuracy of lead terminals of a capacitor by providing a capacitor element having leads extending upward and outward from lower parts of both ends, and sliding the element into a plastic case while guiding the leads along the inside of the case. CONSTITUTION:A metallized film capacitor element 1 has a metal-flamed electrode layer 2 on each end. The electrode layer 2 is connected with a lead terminal 3 at a lower part of its surface. These lead terminals 3 extend upward and outward from both ends of the element 1: each lead has a bent 3a in a middle part. The element 1 is slid into a thermoplastic case 4 which has grooves 5 inside to guide the terminals 3. Then thermosetting resin is filled in the case, and it is hardened. This capacitor structure provides high dimensional accuracy, readiness for insertion into a printed-circuit board, and improved productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a metallized film capacitor housed in a resin case.

BACKGROUND OF THE INVENTION As automatic insertion of electronic components into printed circuit boards becomes more efficient, the precision of the pitch dimension and position of lead terminals for metallized film capacitors has become an important issue.

In conventional metallized film capacitors, as shown in FIGS. 9 to 11, a capacitor element 1 is formed by winding a metallized plastic film, and electrode metal layers 2 are formed by spraying metallicon metal on both end faces of the capacitor element 1. However, the lead terminal 3 was welded to the outer surface of the electrode metal layer 2, housed in a resin case 4, and resin 6 was injected and hardened.

Problems to be Solved by the Invention However, in the conventional metallized film capacitor described above, the capacitor element 1 may shift to one side as shown in FIG. 10 or tilt as shown in FIG. 11 within the resin case 4. As a result, the position of the lead terminal 3 is misaligned, making it difficult to automatically insert it into the printed circuit board.

In addition, if the lead terminal 3 is shifted to one side of the resin case, it will come into contact with the inside of the open end of the resin case 4, so by the time the injected resin 6 hardens, the surface tension will cause the outside of the resin case to move as shown by the arrow in Figure 11. There were problems such as leakage to the sides.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention forms an electrode metal layer by thermally spraying metallicon metal on both end faces of a metallized film capacitor element, and forms an electrode metal layer with a thickness of 1/2 or less of the electrode metal layer. One end of the lead terminal is connected to the lower outer surface of the lead terminal, and the other end of the lead terminal is in an inverted V shape with respect to the opposite lead terminal.
Then, a bent part is formed in the middle position so that the lead interval becomes narrower, and the lead terminal is slid along the inner surface of the resin case, and the metallized film capacitor element is housed in the resin case. A metallized film capacitor characterized by being poured and cured.

Further, the metallized film capacitor is characterized in that a curved portion that contacts the resin case is formed between the connecting portion of the lead terminal to the electrode metal layer and the bent portion.

According to the above-described structure, when the capacitor element is housed in the resin case, the lead terminal is inserted in the vertical direction along the inner surface of the resin case, and the capacitor element is inserted vertically along the inner surface of the resin case. Dimensions A and B of the bent portion of the square-shaped pull-out lead terminal are always constant from the contact position of the guide groove, and highly accurate dimensions with little variation in terminal spacing can be obtained.

EXAMPLES The present invention will now be described with reference to metallized film capacitors shown in FIGS. 1 to 7.

First, as shown in Fig. 1, metals such as 7-luminium and zinc are deposited on a plastic film such as polypropylene or polyester to form a metallized film, and the capacitor element 1 is formed by facing each other. An electrode metal layer 2 is formed by spraying metallicon metal such as solder on both end faces,
The lower outer surface of 1/2 or less of the electrode metal layer (Figure 2 ((2)
34L position) by welding, soldering, etc., and then connect the other end of the lead terminal 3 to the opposite lead terminal 3 as shown in FIG.
A bent portion 3a is formed in an inverted figure-eight shape and at a position in the middle thereof so that the lead interval becomes narrower.

At this time, dimensions A and B are bent to a constant value.

Then, as shown in FIG. 3, the above-mentioned lead terminal 3 is slid into the guide groove 5 formed on the inner surface of the thermoplastic resin case 3 made of polyester, polybutylene terephthalate, etc., and the metallized film capacitor element 1 is inserted as shown in FIG. It is stored in the resin case 4. At this time, the dimensions A and B of the bent portion 3a are located at a constant distance from the groove of the resin case 4, and the two lead terminals 3 are drawn out from the resin case 4 substantially parallel to each other. Then, a thermosetting resin 6 such as epoxy resin or polyurethane resin is injected and cured to complete the process.

FIG. 5 shows another embodiment in which a curved portion 3b is formed in advance before connecting the lead terminal to the electrode metal layer 2 of the capacitor element 1, and after the connection is made by welding, soldering, etc., the above-mentioned embodiment is applied. Similarly, it has an inverted figure-eight shape and a bent portion 3a, and can be housed in a resin case 4. In this case, capacitors with a dimensional margin between the electrode metal layer 2 of the capacitor element and the electrode metal layer 2 can be stored as shown in FIG. 3b can be extended and stored as shown in Figure 7.

In either case, the above-mentioned dimensions of the bent portion 3a (A%
B or E%F or C%O) can be manufactured at a constant position from the guide groove, and the lead terminals 3 of the capacitor can be configured at positions with little variation in pitch dimension.

The table shows the rated 250 V manufactured based on the above example.
%0. The results of measuring the dimensions of each part shown in FIG. 8 of a 2244 F metallized film capacitor are shown, and it was demonstrated that the product of the present invention has little dimensional variation.

n=50 In the above embodiment, the guide groove 5 was provided in the resin case 4, but it is also possible to use a case where the lead wire is taped to prevent the capacitor element from tilting as shown in FIG. Depending on the manufacturing method, such as when using a lead wire clamp jig, the guide groove 5 may be omitted.

Effects of the Invention As described above, the metallized film capacitor of the present invention has high dimensional accuracy, facilitates automatic insertion into printed circuit boards, greatly contributes to improved productivity, and has great industrial and practical value. .

[Brief explanation of the drawing]

Figures 1 to 7 show examples of the metallized film capacitor according to the present invention. Figures 1 and 2 (a) are front views of the capacitor element, and Figure 2 (2) is a side view of the capacitor element. Figure 3 is a perspective view of the resin case, Figure 4 is a sectional view of the metallized film capacitor, Figure 5 is a front view of the capacitor element, and Figures 6 and 7 are of different metallized film capacitor elements. 8 is a plan view of a metallized film capacitor, FIGS. 9 to 11 are perspective views of a conventional capacitor element, and FIGS. 10 and 11 are sectional views of a conventional metalized film capacitor. 1: Capacitor element 2: Electrode metal layer 3: Output lead terminal 3a: Bent part 3b: Curved part 4 = Resin case 5: Guide groove 6: Resin

Claims (2)

[Claims] (1) Form an electrode metal layer by thermally spraying metallicon metal on both end faces of a metallized film capacitor element, connect one end of the drawer lead terminal to the lower outer surface of 1/2 or less of the electrode metal layer, and The other lead terminal has an inverted V-shape with respect to the counter lead terminal, and a bent part is formed in the middle position to narrow the lead interval, and the lead terminal is bent along the inner surface of the resin case. The metallized film capacitor element is placed in a resin case, resin is injected,
A metallized film capacitor characterized by being hardened. (2) A metallized film according to claim 1, characterized in that a curved part that contacts the inner surface of the resin case is formed between the connection point of the electrode metal layer of the extraction lead terminal and the bent part. capacitor.