JPH0429551Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a chip-type LC composite component, for example, a chip-type LC composite component suitable for use as a noise filter.

(Prior Art) In a conventional LC composite component of this type, for example, as shown in FIG. Furthermore, a ferrite bead 7 through which a center conductor 6 passes is inserted into a cylindrical capacitor 5 formed with an electrode 4 (hereinafter referred to as outer electrode 4) that commonly faces these inner electrodes 2 and 3 on the outside. Then, both opening sides of the cylindrical capacitor 5 are filled with solder 8 to connect the inner electrodes 2 and 3 to the center conductor 6, and if necessary,
An eyelet member 9 is fitted onto the outer electrode 4 and connected with solder 10.

However, since such a conventional LC composite member is formed by combining a separate capacitor 5 and ferrite beads 7, the product becomes large and complicated to manufacture. Therefore, the applicant has recently proposed a chip-type LC composite component as shown in FIG. That is,
A dielectric bobbin 1 in which first and second flanges 12 and 13 are formed at both ends of a coil winding part 11.
4, a coil 15 is wound around the coil winding portion 11, and a pair of pull-out terminals 16,
17 formed on the first flange 12.
and second electrodes 18 and 19, respectively, and a third electrode 20 is formed between these electrodes 18 and 19. The chip-type LC composite component shown in FIG. 10 forms a so-called π-type equivalent circuit as shown in FIG. A printed circuit board 24 on which patterns 21 and 22 and a ground pattern 23 are formed.
, the first to third electrodes 18, 19, 20
Each of these patterns 21, 22, 23 and solder 2
5, it can be connected and fixed.

(Problem that the invention attempts to solve) However, the above chip-type LC composite component
The first to third electrodes 1 are placed on the bottom surface of the flange 12.
Since the electrodes 8, 19, and 20 are arranged in parallel, the spacing between each electrode 18, 20 and 20, 19 becomes very narrow. For this reason, the intervals between the patterns 21, 22, 23 on the printed circuit board 24 are also very narrow, and when soldering to these patterns 21, 22, 23, solder bridging is likely to occur, reducing the reliability of the installation. There is a risk that the risk of Furthermore, since the distance between the first and second electrodes 18 and 19 is narrow, the distributed capacitance formed between these electrodes 18 and 19 becomes large, and the self-resonant frequency of the coil 15 decreases. When this chip-type LC composite component is used as a noise filter, it has the disadvantage of causing deterioration of filter characteristics.

If an attempt is made to increase the spacing between the respective electrodes in order to solve such inconveniences, the overall shape will become larger, and each electrode 18, 20 and 2
This has the disadvantage that the capacitance of the capacitor formed between 0 and 19 becomes small.

The present invention was developed in consideration of these points, and it is highly reliable in mounting without increasing the overall size or reducing the capacitance of the capacitor, and when used as a noise filter. The purpose of this invention is to provide a chip-type LC composite component with excellent filter characteristics.

(Means for Solving the Problems) The chip-type LC composite component of the present invention includes a dielectric bobbin in which first and second flanges are formed at both ends of a coil winding portion, and first and second electrodes formed on one main surface at a predetermined interval; a third electrode formed on one main surface of the second flange; , a coil whose pair of drawer terminals are respectively connected to the first and third electrodes.

(Function) Since the chip-type LC composite component of the present invention has the above-described configuration, an inductor is formed between the first and third electrodes by the coil wound around the coil winding part, and A capacitor connected in parallel with the inductor is formed between first and second electrodes formed at a predetermined interval on one main surface of a first flange made of a dielectric material.

(Example) An example of the present invention will be described below in detail with reference to the drawings.

Figure 1 shows a front perspective view of the chip-type LC composite part;
FIG. 2 is a perspective view of the rear side thereof, and FIG. 3 is a longitudinal sectional view thereof.

In these figures, a bobbin 31 is made of a dielectric material and has a first flange 33 and a second flange 34 formed at both ends of a prismatic coil winding part 32. Reference numerals 35 and 36 are first and second electrodes formed at a predetermined interval on both ends of the bottom surface of the first flange 33 in the longitudinal direction. 37 is a third electrode formed on one main surface of the second flange 34. 38 is a coil wound around the coil winding part 32, and a pair of pull-out terminals 3 of the coil are wound.
9, 40 are the first and third electrodes 35, 3;
7 and are connected to each other by solder or the like (not shown).

The chip-type LC composite component according to one embodiment of the present invention having such a configuration forms a so-called L-shaped equivalent circuit as shown in FIG. That is, the coil 38 connects the first and third electrodes 35, 3
An inductor is formed between the first and second electrodes 35 and 36, and a capacitor connected in parallel with the inductor is formed between the first and second electrodes 35 and 36.

The chip-type LC composite component of one embodiment of the present invention is
In this way, since it forms an L-shaped equivalent circuit, when used as a noise filter to remove high frequency noise, the capacitor does not function as a bypass capacitor for the inductor, so it effectively removes noise. can do. Moreover, since the distance between the first and third electrodes 35, 37 is large, these electrodes 35, 37
The distributed capacitance of the coil 38 connected therebetween becomes smaller, the self-resonance frequency of the coil 38 increases, and when used as a noise filter, it exhibits good filter characteristics.

The above chip-type LC composite part is, for example, the fifth
As shown in the figure, the first and third electrodes 35, 37 and each input/output pattern 51, 52 are mounted on a printed circuit board 54 on which a pair of input/output patterns 51, 52 and a ground pattern 53 are formed. ,
The second electrode 36 and the ground pattern 53 are connected and fixed by solder 55 or the like, and then used. In this case, a ground pattern 23 must be formed between the pair of input/output patterns 21 and 22 on the printed circuit board 24 shown in FIG. 12, which is used to attach the chip-type LC composite component that has been proposed in recent years. Therefore, the spacing between the patterns 21, 22, 23 is narrow and the design becomes complicated. In this case, since it is not necessary to form the ground pattern 53 between the pair of input/output patterns 51 and 52, the spacing between each pattern 51, 52, and 53 is wide, and the design is easy. Even when this is done, solder bridging is less likely to occur and the installation can be performed reliably.

FIG. 6 is a front perspective view of a chip-type LC composite component according to an embodiment of the present invention, FIG. 7 is a back perspective view thereof, and FIG. 8 is a longitudinal sectional view thereof.

The basic configuration is the same as that of the embodiment shown in FIGS. 1 to 3, so the same numbers will be used for the same members and the description thereof will be omitted.

That is, in these figures, 61, 62
are frame terminals formed in a roughly L-shape, one piece of which is connected to the first and second electrodes 3, respectively.
5 and 36, and the other piece protrudes upward along both end surfaces of the first flange 33. 63
is a frame terminal formed in a roughly U-shape, whose head 64 is connected to the third electrode 37, and whose legs 65 and 66 are connected along the coil winding section 32, respectively. It is formed so as to be wrapped around the bottom side of the first flange. 6
7 is each of these frame terminals 61, 62, 63
It is an insulating resin that covers the outer periphery of the bobbin 31 so that its surface is exposed. This insulating resin 67 is formed by potting or molding the insulating resin case.

Such a chip shape of another embodiment of the present invention
The LC composite component will be more reliable than the embodiments shown in FIGS. 1-3.

It goes without saying that the chip-type LC composite component of the present invention is not limited to those of the above-mentioned embodiments, and may be modified as appropriate without changing the gist.

For example, each electrode 35, 36, 37 may be formed over the side surface, end surface, etc. of each flange 33, 34, if necessary.

Furthermore, recesses are formed in the side surfaces of the first and second flanges 33, 34, and the respective pullout terminals 39, 40 of the coil 38 are formed on each one main surface of each flange 33, 34 through the recesses. The first and third electrodes 35 and 37 may be connected to each other.

Furthermore, the shape of the bobbin 31 is arbitrary; for example, the first and second flanges 33 and 34 may have the same shape.

The chip-type LC composite component of the present invention is not limited to noise filters.

(Effects of the invention) The chip-type LC composite part of the invention has the above configuration, so the overall shape can be increased,
It exhibits excellent effects such as high reliability of attachment without reducing the capacitance of the capacitor, and excellent filter characteristics when used as a noise filter.

[Brief explanation of the drawing]

Fig. 1 is a front perspective view of a chip-type LC composite component according to an embodiment of the present invention, Fig. 2 is a back perspective view thereof, Fig. 3 is a longitudinal sectional view thereof, and Fig. 4 is its equivalent circuit. 5 is a perspective view showing an example of the attached state, FIG. 6 is a front perspective view of a chip-type LC composite component according to another embodiment of the present invention, and FIG. 7 is a back perspective view thereof. FIG. 8 is a longitudinal sectional view thereof, FIG. 9 is a sectional view showing an example of a conventional LC composite component, FIG. 10 is a sectional view of a chip-type LC composite component that has been proposed in recent years, and FIG. , its equivalent circuit diagram, and FIG. 12 is a perspective view showing an example of its attached state. 31... Bobbin, 32... Coil winding section, 3
3, 34...flange, 35, 36...first and second electrodes, 37...third electrode, 38...coil, 39, 40...coil extraction terminal.

Claims (1)

[Claims for Utility Model Registration] A dielectric bobbin having first and second flanges formed at both ends of a coil winding portion; a third electrode formed on one main surface of the second flange; a third electrode that is wound around the coil winding portion, and a pair of lead-out terminals thereof are connected to the first and second flange; A chip-type LC composite component characterized by consisting of a coil connected to three electrodes, respectively.