JPS5834750Y2 - LC composite parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an LC composite component used, for example, in the signal system of a video tape recorder or as a low-pass filter for the luminance signal circuit of a color television.

FIG. 1 shows this type of low-pass filter circuit.

In the figure, Ll, L2 and L3 are coils, C1, C2
, C3, C4 and C5 represent capacitors.

Coil L2. L3 has an intermediate tap T1 or T2 connected to one end of the capacitor C3 or C4, and coils L2-□ and L2-2 and coils L3-1 and L3-2 on both sides of the intermediate tap T□ or T2 are connected to one end of the capacitor C3 or C4. It is configured to obtain inductance and coupling coefficient.

When combining the low-pass filter circuit shown in Figure 1,
Conventionally, as shown in FIG. 2, electrode patterns P1 to P5 of an area easily corresponding to the capacitors C1 to C5 are formed on one surface of a dielectric substrate 1 made of a ceramic substrate or the like, and one end of the dielectric substrate 1 is formed. Rectangular notch grooves 2, 3 and 4 are provided on the edge, and within the notch grooves 2, 3 and 4, coils L,
, L2 and L3, respectively, were mounted such that their axial directions were perpendicular to the surface of the dielectric substrate 1.

In this case, coil L2. As shown in FIG. 3, the flange-equipped drum core 6.7 with L3 wound thereon has flange portions a, l) and c at three locations at both ends and the middle portion, and the coil L2 is placed between the flange portions a-1). -1 (or coil L3-.) into section 1.
) Coil L2-2 (or coil L3-2) between -c
are wound respectively, and coil L2 1 (or coil L3
When winding the rod from 1) to coil L2-2 (or coil L3-2), remove the slack and connect it to the intermediate tap lead wire T1 (
Or T2).

Further, protruding pieces 8 to 13 are provided at the lower end of the dielectric substrate 1, and the winding start end lead wires S1. S2. S3, winding end lead wire F1.
F2. F3 and "intermediate tap lead wire T1. T2 is pulled and tied together, and the middle part is connected to a predetermined electrode pattern P1.
- It is soldered and fixed on P5.

14, 15, and 16 are lead terminals, the lead terminal 14 is connected to the electrode pattern P6, and the lead terminal 15 is connected to the electrode patterns P2 to P2.
The lead terminal 16 is connected to the common electrode pattern P7 formed on the back surface of the dielectric substrate 1 opposite to the electrode pattern P5.
Each is fixed with solder on the top.

By the way, in this type of LC composite part, the above-mentioned coils L□, L2. Since the wire diameter of L3 is extremely thin and easily breaks, coils L□, L2. Great care must be taken when the lead wires drawn out from L3 are tied around the protrusions 8 to 13 of the dielectric substrate 1 and fixed by soldering, and lead wire processing is troublesome and takes a long time.

Therefore, in order to increase productivity, reduce the probability of coil breakage and short circuit accidents, and improve reliability, coil L
1. L2. It is very important to reduce the number of lead wires of L3 as much as possible.

However, in the conventional structure, the coil L2. L3
The number of lead wires is the winding start end lead wire S2. S3, intermediate tap lead wire T1. T2 and winding end lead wire F2. F3
A total of six wires are required, and the number cannot be reduced below this limit, so there is a limit to the improvement of productivity and reliability.

Also, coil L2-1. A drum core 6.7 with a long axial length on which L2-2 or coil L3-1°L3-2 is wound in series is disposed perpendicularly to the surface of the dielectric substrate 1. Since it is attached to the edge, the contact between the flanged drum core 6.7 and the dielectric substrate 1 is a point-like contact between an arc and a plane, and the contact surface is very small.

Therefore, even if the dielectric substrate 1 is fixed with adhesive, etc.
The attachment strength and stability of the drum core 6.7 with the flange against the lead wire are likely to be insufficient, resulting in so-called looseness, which may cause the drum core 6.7 with the flange to fall off, or excessive force may be applied to the lead wire, resulting in a wire breakage or short circuit accident. Something happened.

Moreover, since the substantial thickness of the LC composite component depends on the axial length of the flanged drum core 6.7,
There were also limits to miniaturization and thinning.

The present invention aims to eliminate the above-mentioned conventional drawbacks and provide a thin LC composite component with excellent productivity and reliability.

In order to achieve the above object, the present invention includes a dielectric substrate having a capacitor constituted by electrode patterns provided opposite to each other on a part of both surfaces, and a coil forming an LC circuit between the capacitor and the dielectric substrate. In an LC composite component equipped with a wound core, two or more types of coils have an intermediate tap connected to the capacitor among the coils, and the coils on both sides of the intermediate tap are mutually inductively coupled, It is characterized by being continuously wound around the same drum core with a flange.

Hereinafter, the content of the present invention will be described in more detail with reference to the accompanying drawings, which are examples.

FIG. 4 shows a front view of the LC composite component according to the present invention.

The figure shows a composite of the low-pass filter circuit shown in FIG. 1, and therefore the circuit is exactly the same as the LC composite component shown in FIG. 2.

In FIG. 4, the same reference numbers as in FIG. 2 indicate the same components.

In the figure, 17 is a drum core with a flange.

As shown in FIG. 5, the flanged drum core 17 is provided with two further flanges A and B' between the flanges a and C at both ends, and a coil is inserted between the flanges a and b. L2-1 is connected to coil L2-2 and coil L3 between brim portion bb'.
-1, and a coil L3-2 is further wound between the brim portions b' and C.

Coil L2 1. L2 2. When winding L3-1 and L3-2, one wire ring is continuously wound without being cut in the middle.

Therefore, the lead wires drawn out from the drum core 17 are the winding start end lead wire S2, the intermediate tap T1. T2
and the winding end lead wire F3, for a total of four wires.

Winding end lead wire F2 of coil L2-2, which was required in the past
And, the winding start end lead wire S3 of the coil L3-1 is connected to the collar part bb.
Since it is absorbed by the continuous winding at ', it becomes unnecessary.

Therefore, the number of IJ-wires, which were previously required to be 6, is reduced to 4, which makes lead wire processing easier and productivity improved.
The probability of short circuit accidents also decreases.

The flanged drum core 17 is fitted into a notched groove 18 provided at one end edge of the dielectric substrate 1 while aligning its axial direction parallel to the surface of the dielectric substrate 1, and is bonded.

With such a structure, the flanges a and C at both ends come into surface contact with the notch groove side surfaces 18a and 18b of the dielectric substrate 1, so that adhesive strength and stability are improved, and the drum core with flanges 17 is The occurrence of falling accidents, breakage of lead wires due to looseness, and short circuit accidents are greatly reduced.

Further, since the substantial thickness of the LC composite component is reduced to a dimension determined by the axial length of the flanged drum core 5 or the diameter of the flanged drum core 17, it also contributes to miniaturization and thinning.

Furthermore, since the drum core 6.7 with a flange, which was conventionally composed of two parts, is made into one part with the drum core 17 with a flange, the number of parts and man-hours are reduced.
falling accident, lead wire breakage that occurs based on this,
The probability of short circuit accidents is reduced.

As explained in detail above, the present invention involves winding a coil that forms a C circuit between the capacitor and the dielectric substrate, which has a capacitor constituted by electrode patterns that are provided opposite to each other on a portion of both sides. In the L-sensor composite component, which is equipped with a core equipped with a cylindrical core, two or more types of coils having an intermediate tap connected to the capacitor among the coils and having coils on both sides of the intermediate tap mutually inductively coupled are identical. Since it is characterized by being continuously wound around a drum core with a flange, it has the following effects.

(1) Since the lead wires that connect two or more types of coils are omitted and the number of lead wires is reduced, productivity is improved and at the same time, the probability of lead wire breakage and short circuit accidents is reduced. This can be effectively reduced and reliability improved.

(2) Two types of coils L2゜L3, which used to be two parts
The core of the product is integrated into a single component, reducing the number of parts and man-hours, leading to cost reductions.

At the same time, the probability of the core falling off, and the lead wire breakage and short circuit resulting from this, is reduced, improving reliability.

(3) As shown in the example, coil L2. When the drum core with a flange for L3 is mounted in a direction parallel to the surface of the dielectric substrate, the attachment strength and stability between the drum core with a flange and the dielectric substrate are improved, and reliability is improved.

It also contributes to thinning.

[Brief explanation of drawings]

Figure 1 is the electric circuit connection diagram of the low-pass filter circuit, Figure 2
The figure is a front view of a conventional LC composite component that combines the low-pass filter circuit of FIG. 1, and FIG. FIG. 4 is a front view of the LC composite component according to the present invention, and FIG. 5 is a partial cross-sectional view of the drum core with flanges according to the present invention. 1...Dielectric substrate, 5,6.7...Drum core with flange, 17...Drum core with flange,
L□, L2. L3... Coil, T1. T2
...Middle tap, P1-P7...Electrode tap, C1-C5...Capacitor.

Claims (2)

[Scope of utility model registration request] (1) A core wound with a coil that forms an earth C circuit with the capacitor is attached to a dielectric substrate having a capacitor formed by electrode patterns provided so as to face each other on parts of both surfaces. In the above-mentioned LC composite part, two or more types of coils having an intermediate tap connected to the condenser among the coils and in which coils on both sides of the intermediate tap are mutually inductively coupled are connected to the same flanged drum core. An LC composite part characterized by being formed by winding the parts. (2) The drum core with a flange is attached to one edge of the dielectric substrate with its axial direction parallel to the surface of the dielectric substrate, as set forth in claim 1 of the utility model registration claim. LC composite parts.