JPH03262312A - Lc filter - Google Patents

Abstract

PURPOSE:To miniaturize a multi-purpose electric circuit by interconnecting lead terminals of a coil and a chip capacitor within a narrow space in various combinations. CONSTITUTION:A coil 1 wound on a ferrite core is mounted on a terminal board (lead terminals 4a-4d) and four lead wires 2 are connected to the lead terminals 4a-4d respectively. Thus, the four lead terminals 4a-4d are bent downward along an outer side face of an outer package 5 and further bent along the inner face of a recessed part 6 provided to a lower face of the outer package resin 5, a chip capacitor 7 is contained in the recessed part 6 and the lead terminals 4a-4d are connected to an electrode 8 of the chip capacitor 7 with solder 9. Thus, a multi-purpose electric circuit is realized. Then the electric circuit is miniaturized.

Description

[Detailed description of the invention] Industrial applications The present invention is a computer and a video tape recorder.

This invention relates to LC filters used in signal circuits such as television receivers.

2. Description of the Related Art A conventional LC filter will be explained with reference to FIGS.

In FIG. 6, 30 is a capacitor, 31 is a coil configured by winding a coated copper wire around a ferrite core, and 32 is a collar provided at both ends of the ferrite core for winding the coated copper wire. 331L.

33b is the lead wire of Koi/v31% 33c is the lead wire of capacitor 3o, 34 is the lead flJ of capacitor 30
A connecting wire connects 33c and the lead wires 33a and 33b of the coil 32, 36 is an outer case, and FIG.
The electric circuit diagram shown in the figure consists of an inductance 36 and a capacitance 3T (see Japanese Utility Model Application Publication No. 102320/1983).

Problems to be Solved by the Invention However, the above configuration requires only one type of electric circuit, and cannot be applied to various electric circuits as LC filters, such as trap circuits and L-type circuits. Furthermore, when the coils and capacitors are lined up to form a multi-connected type, the bottom area becomes large, making it difficult to downsize.

The present invention solves these conventional problems, and aims to provide an LC filter that is compact and can be configured into a variety of electrical circuits.

Means for Solving the Problems In order to achieve the above object, the LC filter of the present invention provides a coil having a plurality of lead wires on one or more lead terminals to which the lead wires are fixed. Connect the terminals, bend the lead terminals downward along the outer surface of the exterior resin, further bend them along the inner surface of a recess provided on the lower surface of the exterior resin, store the chip capacitor in the recess, and The structure is such that the lead terminals and the electrodes of the chip capacitor are soldered.

Effect: According to this configuration, the lead terminals of the coil and the chip capacitor can be connected in various combinations within a narrow space.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

In Fig. 1, numeral 1 is a coil having four lead wires 2, which are constructed by winding a coated copper wire around a ferrite core, and numeral 3 is a coil provided at both ends of the ferrite core for winding the coated copper wire. It is a spittle that has been washed away.

The coil /L/1 wound around the ferrite core is attached to lead terminals 41L, 4b, 4Q, 4(l), and the lead terminals 4a to 4d are connected to four lead wires 2.

Furthermore, four lead terminals 41L, 4b, 40.4 (1 are bent downward along the outer surface of the exterior resin 5 as shown in FIGS. 2 and 3, and are further provided on the lower surface of the exterior resin 5). The chip capacitor 7 is housed in the recess 6, and the lead terminals +a, 4b, 4c are bent along the inner surface of the recess 6.
, 4d are connected to the t-pole 8 of the chip capacitor 7 by solder 9.

The electric circuit configured as described above is shown in FIG. 4(a).

(bl　,　(c) will be an electric circuit.

In addition, in the case of an electric circuit that does not require connection, it is also possible to cut off any one of the lead terminals 4a, 4b, 4c, and 4d midway.

Furthermore, the chip capacitors 7 can be mounted in multiple series or individually, and there are no restrictions on the number of multiple series or the capacitance value.

Furthermore, it goes without saying that it is also possible to attach a capacitor of a required capacity according to the inductance value of the coil lv1.

Further, in the embodiment, an example in which one coil and four lead terminals are provided has been described, but the present invention is not limited to this.

Effects of the Invention As described above, the LC filter of the present invention provides the following effects.

(1) Since the lead terminals of the coil are connected to the chip capacitors housed in the recesses on the bottom of the exterior resin, a variety of electrical circuits can be made smaller.

(2) An LC filter with a small bottom area and high packaging density can be obtained.

(3) Since the capacitance fil (capacitance) of the capacitor can be selected and stored according to the inductance of the coil, defects due to variations in inductance are eliminated.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the internal structure of the LC filter of the present invention before exterior resin coating, Figure 2 is a sectional view after exterior resin coating, Figure 3 is a perspective view similarly seen from the bottom, and Figure 4. (al
, (b) and (c) are electric circuit diagrams, FIG. 5 is a perspective view showing the internal structure of a conventional LC filter, and FIG. 6 is a diagram of the same electric circuit. 1... Coil, 2... Output wire, 4a
, 4b. 4c, 46... Lead terminal, 5... Exterior resin, 6... Concave portion, 7... Chip capacitor, 8... tW, 9...Solder.

Claims (1)

[Claims] A coil having a plurality of lead wires is provided on one or more lead terminals to which the lead wires are fixed, the lead wires and the lead terminals are connected, and the lead terminals are bent downward along the outer surface of the exterior resin, Furthermore, the LC filter is bent along the inner surface of a recess provided on the lower surface of the exterior resin, a chip capacitor is housed in the recess, and the lead terminal and the electrode of the chip capacitor are soldered.