JPH0620025B2 - Multilayer LC filter parts - Google Patents

Description

TECHNICAL FIELD The present invention relates to a laminated LC filter component, and more particularly to a composite laminated LC filter component having a plurality of filters capable of providing a filter function to terminals of IC components.

(Prior Art and its Problems) With the advent of the age of television information, a so-called analog television using a conventional analog signal is being changed to a digital television using a digital signal. Since the digital television performs signal processing of 0.1, there is a point that noise should be considered more than the analog television.

FIG. 1 shows an example of the circuit configuration of a digital television (for example, the magazine “Television Technology” September 1984 second issue).
See page 6 onwards). Such a circuit is realized by using a plurality of IC parts such as a CPU chip. One example is as shown in FIG.

However, it is known that a digital television circuit equipped with such an IC component has a problem of noise and malfunction of the IC occurs unless a noise filter is attached to the lead pin of the IC. However, the number of IC extraction pins is large,
A very troublesome work is required to provide one noise filter for each extraction pin.

(Object of the Invention) Therefore, an object of the present invention is to provide a simple noise removing means for such an IC component, and thereby to improve the assembly rate of an electric circuit of a digital television or the like.

SUMMARY OF THE INVENTION The above objective is accomplished by an LC filter component of the present invention. That is, the LC filter component of the present invention is a chip I
In the LC laminated body in which the LC filters are incorporated corresponding to the respective terminal positions of the C component, one terminal of each filter is drawn out to an external terminal electrode arranged so as to be able to contact each terminal of the IC component, and the other terminal Is drawn out to external terminals arranged around the LC laminate. The plurality of filters are produced by a lamination technique, and the terminal electrodes of these filters can be arranged along one edge, both edges or the entire peripheral edge of the laminate.

Since the IC components usually have standardized extraction pin positions and dimensions, the laminated LC filter component of the present invention can be used in many ICs.
It is an extremely versatile component that can be used as a component, and if an IC component is mounted and connected to this LC filter component, a large number of filters will be connected to the IC pins all at once, which shortens the work process and reduces costs. The effect of conversion is very large.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 shows LC in the laminated LC filter component 10 of the present invention.
FIG. 6 is an enlarged view showing the allocation of filters, namely, filter F1,
F2, F3 ... And F11, F12, F13 ... Are arranged on both sides of the component 10. In some cases, only one of these two sets may be used, as will be specifically described in the embodiments. Although one filter will be described in the following description, it should be understood that a large number of filters are actually formed simultaneously as shown in FIG.

FIG. 4 shows the manufacturing process of the laminated LC filter, but the filter itself is known. In this example, a T-type low-pass filter is illustrated. In FIG. 4, (1) to (23) show steps.

Steps (1) to (5) show the method of forming the capacitor part.
In (1), first, a plastic sheet of polyester or the like is laid on a metal cheat of aluminum or the like, and ceramic powder (TiO ₂ , BaTiO _3, etc.) is printed with a paste kneaded with a binder to form a ceramic layer 1. . At that time, the C ₁ drawing portion is drawn to the upper side. Then, the electrode layer 2 is printed with a paste prepared by kneading metal powder (Ag, Ag-Pd, etc.) with a binder in the step (2), and the ceramic layer 3 is printed again on the entire surface in the step (3). The electrode layer 4 is again formed by printing with the above method. At that time, the C ₂ drawing portion is drawn to the lower side.

This C ₂ lead portion is led out as a conductor 4 '(shown by a chain line) so as to serve as a ground electrode and extended to both ends of the laminate. Next, in step (5), the ceramic layer 5 is formed to complete the lamination of the capacitor section.

Steps (6) to (11) show the steps of forming the first coil. Process (6)
In, the ferrite layer 6 is formed on the capacitor portion by printing a paste prepared by kneading the high-permeability ferrite powder with the binder, and the conductor layer 7 for half a turn is formed by printing in the step (7). Form the L ₁ drawer. Process
The ferrite layer 8 is formed by printing, leaving one end of the conductor 7 as in (8), and the conductor 9 for half a turn is formed by printing after the conductor 7 as in step (9). Further, in step (10), the conductor 11 for about half a turn is printed and drawn out to the L ₂ drawing portion on the upper side. This forms the coil L ₁ .

In the step (12), magnetic substance or non-magnetic substance (ceramic, etc.)
Print an intermediate layer 12 of powder paste (selected depending on the required coupling coefficient of the two coils).

Steps (13) to (20) show the steps of forming the second coil. Since the method is the same as that for the first coil, only the partial names are described, and the differences will be described in detail. 13 is L ₃
A conductor for a coil that has a lead-out part on the upper side, for about half a turn,
Reference numeral 14 is a ferrite layer, 15 is a conductor for half a turn, 16 is a ferrite layer, 17 is a half-turn conductor, 18 is a ferrite, and 19 is a conductor for about a half turn. In the step (19), the end of the conductor 19 has an L ₄ lead portion at a position apart from the upper side. This position corresponds to the position of one lead pin or terminal of the IC component to be assembled. Then, the ferrite layer 20 is formed by printing on the entire surface except L ₄ .

The number of layers, the thickness, etc. of the first coil, the second coil, and the capacitor section are design matters.

Firing is performed in the step (21) to obtain a monolithic sintered body.

In step (22), silver paste or the like is applied to the lead-out portions C ₁ , L ₁ and L ₃ to form the external terminal electrode N, applied to L ₄ to T ₂ and applied to L _2. To T ₁ ′. For the sake of simplicity, these external electrode positions are shown as 1, 2, ..., 1 ', 2' ... In the following embodiments, and T corresponding to the intermediate tap is not marked. Shown with terminal electrodes. When the low temperature baking is performed in the step (23), the completed loaded LC filter parts can be obtained.

FIG. 5 (A) is a circuit diagram of each of the obtained filters.
FIG. 1B shows an example of the low pass filter characteristic.

An embodiment of the present invention using the above basic configuration will be described below.

Embodiment 1 Referring to FIGS. 6 to 8, reference numeral 21 is a laminated LC filter component of this embodiment, and 22 is an IC component mounted thereon and joined by soldering or the like.

As shown in FIGS. 6 to 7, the LC filter component 21 contains eight LC filters, and one of these external terminal electrodes 1, 2, ... 8 is exposed on the upper surface. The positions of these electrodes are set so as to vertically overlap with the extraction pins or the extraction terminals 11, 12, ... 18 of the IC component 22, respectively. The other external terminal electrodes 1 ', 2', 3 '... 8'of the filter are provided on the opposite side surfaces of the LC filter component 21. Further common ground electrode GN
D is provided on the other opposite side surface.

With the above configuration, the IC component 22 is simply mounted on the laminated LC filter component 21 as shown in FIG. 8, and the external terminal electrodes 1, 2, ... 8 of the filter component 21 are connected to the terminals 11, 12 of the IC component 22. , ... I by soldering to 18
The filter can be connected to the lead-out terminals of the C component all at once.

Example 2 The laminated LC composite component shown in FIGS. 9 to 10 is different from the previous example in the structure of the lead-out terminal electrode to the outside, but is the same as the other examples.
That is, in the manufacturing process of FIG. 4, the L ₄ extraction portion of the coil conductor 19 is drawn to the upper side in the step (19). Therefore, the external terminal electrodes T ₁ ′, N, T ₁ are arranged side by side on the laminated body. As shown in FIGS. 9 and 10, the external terminals 1, 2, ... 8 are drawn out to the surface of the laminated body by printing of the conductive paste and the pins of the IC component 22, that is, the terminals 11, 12 ,. They are aligned corresponding to the 18 positions.

Because of the above configuration, as shown in FIG. 11, the IC component 2
2 is mounted on the laminated LC filter component 31 and the terminal 11,
12, ... 18 are the electrodes 1 of the filter component 31,
By soldering to 2, ... 8, a circuit in which a low-pass filter is attached to each pin of the IC component can be realized all at once and easily.

Embodiment 3 FIGS. 12 to 15 show another example of the present invention. This example is similar to Example 2, but the external extraction electrodes of the filter are lined up on only one side of the laminated LC filter component, just as in Example 2.
The laminated LC filter component of is in the form of being divided into two. That is, as shown in FIG. 11, the external terminal electrodes 1, 2, 3, 4 and 1 ', 2', 3 ', 4'of each filter.
Are drawn to one side surface of the laminated body, the intermediate tap is drawn to the opposite side surface, and the ground electrodes GND are drawn to the left and right ends. FIG. 13 shows the circuit configuration. As shown in FIG. 14, the electrodes 1, 2, 3, 4 are extended to the surface positions corresponding to the pins of the IC component 21, that is, the terminals 11, 12, 13, 14. Laminated LC filter part 41 of this example
Can be used alone when the IC component requires a filter only on one side of the pin row, or as shown in FIGS. 14 to 15, the external terminal electrode 1,
2, ... 8 are formed, and both of these parts 41, 41 are arranged and fixed, and the IC part 21 is mounted thereon, and the electrodes 1, 2,
...... 8 and terminals 11, 12, ... 18 are fixed and integrated.

(Summary of Operation and Effect) As described above, the laminated LC filter component of the present invention has a plurality of LC filters incorporated in one laminated body, and one terminal position of each filter is the lead terminal position of the IC component. Since the laminated LC filter parts of the present invention and I
There is an advantage that an IC circuit provided at the filter terminal position can be configured by simply combining and electrically connecting with the C component,
Significant structural and manufacturing benefits are obtained.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an example of a digital television, FIG. 2 is a schematic diagram of an example of its mounted circuit, FIG. 3 is a filter layout diagram of a laminated LC filter component of the present invention, and FIG. 4 is a filter of the present invention. FIG. 5 (A) is a circuit diagram of a single filter, FIG. 5 (B) is a characteristic diagram thereof, and FIG. 6 is a laminated LC filter component of the first embodiment of the present invention. Perspective view of the seventh
FIG. 8 is a circuit diagram of the same component, FIG. 8 is a perspective view of the same component combined with an IC component, FIG. 9 is a perspective view of a laminated LC filter component of the second embodiment, and FIG. 10 is a circuit diagram of the same component. Figure 11 shows I
FIG. 12 is a perspective view of the C component mounted on the tower, FIG. 12 is a perspective view of the laminated LC filter component of the third embodiment immediately before completion, and FIG.
FIG. 14 is a circuit diagram of the same component, FIG. 14 is a completed view of the same component, and FIG. 15 is a perspective view of the same component combined with an IC component.

Claims (1)

[Claims] 1. A flat plate-shaped laminate having a plurality of capacitors and a plurality of coils, wherein a dielectric layer, a magnetic layer, a capacitor electrode pattern and a coil conductor pattern are laminated and sintered in an appropriate order. The capacitors and the coils are electrically connected by an internal connection so as to form a plurality of filters, and one terminal of each filter corresponds to a position where it can contact a terminal of an IC component to be mounted. 1 of each of the terminal electrodes arranged at a predetermined interval on the flat surface of the
The laminated LC filter component is characterized in that the other terminal is led out to each one of the terminal electrodes arranged at a predetermined interval on the peripheral portion of the laminated body.