JPH06310331A - Lr composite component - Google Patents

Abstract

PURPOSE:To obtain a small-sized LR composite component which can increase the noise removal effect without distorting a normal signal waveform. CONSTITUTION:An LR composite component 1 has a structure in which magnetic-substance sheets 2, 4, 6, 8 in which conductors 11 to 14 for a coil have been formed respectively on surfaces and magnetic-substance sheets 3, 5, 7 in which resistors 30, 31, 33 have been formed respectively on surfaces are stacked. The conductors 11 to 14 for the coil are connected in series via holes 21, 22, 23 made in the magnetic-substance sheets 2 to 7, and the coil 15 is constituted. The coil 15 and the resistors 30, 31, 32 are electrically connected in parallel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LR composite part used to protect various electronic devices from noise.

[0002]

2. Description of the Related Art Conventionally, inductors have been used to protect various electronic devices from noise. However, in the inductor, if the number of windings of the coil is increased to improve the noise removal effect, a new problem occurs that the regular signal waveform is distorted due to ringing or reflection due to a transient current. This is because the impedance increases and the inductance increases as the number of turns of the coil increases.

There is a method of externally attaching a resistance component to the inductor in order to solve this problem, but there is a problem that the mounting area becomes large. There is also a method of utilizing a high frequency resistance component of ferrite or the like which is a material of the magnetic layer of the inductor, but there is a problem that a desired resistance value cannot be obtained. Then, the subject of this invention is providing the small LR composite component which can improve a noise removal effect, without distorting a regular signal waveform.

[0004]

In order to solve the above problems, the LR composite component according to the present invention comprises a magnetic layer, a coil conductor, and a resistor, which are stacked and integrated to form the coil conductor. A coil and the resistor are built in and electrically connected in parallel. In the above configuration, the resistor (parallel deviation) connected in parallel to the coil reduces the offset (residual deviation) in the signal pass band,
Even if the number of turns of the coil is increased to improve the noise removal effect, the regular signal waveform is not distorted.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the LR composite part according to the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the laminated LR composite component 1 includes coil conductors 11, 12,
Magnetic sheet 2, 13 and 14 respectively provided on the surface 2,
4, 6, 8 and magnetic sheets 3, 5, 7 having resistors 30, 31, 32 provided on the surfaces thereof are alternately stacked. The materials for the magnetic sheets 2 to 8 are:
Ferrite or the like is used.

A coil conductor 11 provided on the magnetic sheet 2.
One end 11a is exposed at the left edge of the magnetic sheet 2, and the other end is provided with a via hole 21a. The resistor 30 provided on the magnetic sheet 3 has a resistance value R1.
And both ends of the resistor 30 have lead electrodes 35.
It is electrically connected to a and 35b. Further, the magnetic body sheet 3 is provided with a via hole 21b at a position on the front side of the center. The via hole 21b is used for the coil conductor 11
And 12 are electrically connected to each other, and it is preferable to form a conductor in the peripheral portion and inside of the via hole 21b in order to enhance the connection reliability (hereinafter, the same applies to the via holes 22b and 23b described later). Is).

Coil conductor 12 provided on the magnetic sheet 4
A via hole 22a is provided at one end of the. The resistor 31 provided on the magnetic sheet 5 has a resistance value R2, and both ends of the resistor 31 are respectively connected to the extraction electrodes 36.
It is electrically connected to a and 36b. Further, the magnetic material sheet 5 is provided with a via hole 22b at a position on the inner side of the center.

Coil conductor 13 provided on the magnetic sheet 6
A via hole 23a is provided at one end of the. The resistor 32 provided on the magnetic sheet 7 has a resistance value R3, and both ends of the resistor 32 are respectively connected to the extraction electrodes 37.
It is electrically connected to a and 37b. Resistors 31, 3
2 and 33 are formed with high dimensional accuracy by using a material such as NiCr by a thin film technique such as a sputtering method or a vapor deposition method. Therefore, it is possible to suppress variations in the resistance values R1, R2, and R3. Moreover, this thin film technology
Since the width and thickness of the resistor can be easily changed, the resistance value can be easily changed. Further, an arbitrary resistance value can be set by combining three resistors.

Coil conductor 14 provided on the magnetic sheet 8
One end 14 a of the magnetic sheet 8 is exposed at the right edge of the magnetic sheet 8. Further, a protective sheet 9 is arranged on the upper side of the magnetic body sheet 2. In the state where the sheets 2 to 9 are stacked, the coil conductors 11, 12, 13, and 14 have the via holes 21 (21a, 21b), 22 (22a, 22).
b) and 23 (23a, 23b) are connected in series to form a coil 15 having an inductance L.

By stacking these sheets 2 to 9 and firing them integrally, the LR composite component 1 shown in FIG. 2 is obtained. At both ends of the LR composite component 1, input / output electrodes 40,
41 are formed. End 11a of conductor 11 for coil
And the extraction electrodes 35a, 36a, 37a are the input / output electrodes 4
It is electrically connected to 0. End 1 of conductor 14 for coil
4a and the extraction electrodes 35b, 36b, 37b are electrically connected to the input / output electrode 41.

FIG. 3 is an electrical equivalent circuit diagram of the LR composite component 1. In FIG. 3, R is a high frequency resistance component included in the magnetic material sheets 2 to 8 and the protective sheet 9. In the LR composite component 1 having the above configuration, since the resistors 30, 31, 32 are connected in parallel to the coil 15, the offset in the signal pass band becomes small, and the number of windings of the coil 15 is increased to cause noise. Even if the removal effect is improved, the regular signal waveform is not distorted. Further, since the resistor is built in, it is possible to save the labor of attaching the resistance component externally as in the conventional case and to reduce the mounting area.

The LR composite part according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the gist thereof. If the resistor is provided inside the component as in the above-described embodiment, the stress received from the outside is reduced and the reliability is high. However, depending on the specifications, as shown in FIG. The resistor 52 may be provided on any of the end faces). Here, 55 and 56 are input / output electrodes. The number of resistors is also arbitrary, and may be singular as long as a desired resistance value can be obtained. Further, it is not necessary to limit all the resistors to the ones made of the same material, and resistors made of different materials may be combined.

Although it is desirable that the resistor is formed with high dimensional accuracy by thin film technology, it may be formed by applying a thick film paste such as RaO ₂ by screen printing and drying. Further, in the above-mentioned embodiment, the magnetic material sheets on which the coil conductors or resistors are formed are stacked and then integrally fired, but the invention is not necessarily limited to this. For example, the LR composite component may be manufactured by the manufacturing method described below. After applying a paste-like magnetic material by means of screen printing and drying to form a magnetic material layer, apply a paste-like coil conductor material on the surface of the magnetic material layer and dry it for any coil Form a conductor. Next, a paste-like magnetic material is applied onto the coil conductor and dried to form a magnetic layer.
Further, a paste resistor material is applied to the surface of the magnetic layer and dried to form an arbitrary resistor. By sequentially coating in this manner, an LR composite component having a laminated structure is obtained.

[0014]

As is apparent from the above description, according to the present invention, since the coil and the resistor are built in and electrically connected in parallel, the offset in the signal pass band is reduced. Even if the number of turns of the coil is increased to increase the noise removal effect, the regular signal waveform is not distorted. Further, since the resistor is provided, it is not necessary to externally attach a resistance component as in the conventional case, and the mounting area can be reduced. As a result, without distorting the normal signal waveform,
Small LR that can improve noise removal effect
A composite part is obtained.

[Brief description of drawings]

FIG. 1 is an assembled perspective view showing an embodiment of an LR composite component according to the present invention.

FIG. 2 is a perspective view showing an appearance of the LR composite component shown in FIG.

FIG. 3 is an electrical equivalent circuit diagram of the LR composite component shown in FIG.

FIG. 4 is a perspective view showing another embodiment of the LR composite component according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... LR composite component 2-8 ... Magnetic body sheet 11, 12, 13, 14 ... Coil conductor 15 ... Coil 21, 22, 23 ... Via hole 30, 31, 32 ... Resistor 51 ... LR composite component 52 ... Resistor

Claims (1)

[Claims] 1. A magnetic body layer, a coil conductor, and a resistor are stacked and integrated, and a coil made of the coil conductor and the resistor are built in and electrically connected in parallel. LR composite parts.