JPH0576030U - LC parts - Google Patents

Abstract

(57) [Abstract] [Purpose] A noise filter that combines individual components such as an inductor (L) and a capacitor (C) in order to remove electromagnetic noise from a signal line increases the board mounting area. An LC component for eliminating electromagnetic noise that integrates a capacitor and is inserted into a signal line that has a small board mounting area and is easy to use. [Structure] An inductor is formed by inserting one lead terminal 5 of a U-shaped lead wire 2 into a central hole of a bead core 1 having a high relative magnetic permeability property and an electric insulating coating film on the surface to form an inductor and the other lead. One end of a strip electrode 32 made of a conductive film formed on both surfaces of the capacitor film 3 is electrically connected to the terminal 6, and the ground terminal 4 is connected to the other strip electrode 32 formed so as to face the dielectric film 31. A capacitor film 3 is wound with 1 as a core to wrap the outer circumference, and an LC component is formed by a three-terminal inverted L-shaped filter including lead terminals 5 and 6 and a ground terminal 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an LC component that is inserted into a signal line to remove electromagnetic noise.

[0002]

[Prior Art]

 Conventionally, the means for removing the electrode noise that is inserted into this type of signal line is to wind the signal line around a magnetic core with high relative permeability characteristics, or to combine a single inductor and a single capacitor into a filter circuit. Although it is formed on the signal line, there is a problem that the board mounting area becomes large because it is formed by combining individual components.

[0003]

[Problems to be solved by the device]

 In order to solve the above problems, the present invention uses an inductor formed by penetrating a signal line in the center hole of a cylindrical ferrite core having high relative magnetic permeability characteristics, and winding a film capacitor around the inductor. , The ground terminal is connected to one end of the capacitor electrode, and the purpose is to remove the electromagnetic noise that is mounted on the signal line in which the inductor (L) and the capacitor (C) form a 3-terminal inverted L-type filter as a unit. This is an LC component with a small board mounting area.

[0004]

[Means for Solving the Problems]

 One of the U-shaped lead wires (hereinafter referred to as the lead wire) is placed in the central hole of the bead core, which is made of a ferrite core with high relative magnetic permeability characteristics and high specific resistance, and whose surface has an electrically insulating coating. Insert and attach the legs, and use one of the strip electrodes of the capacitor film, in which the conductive film electrode film is formed on both sides of the thin dielectric film made of an organic material with a high dielectric constant on the other lead wire, by spot welding or conductive paint. Connect, connect the ground terminal to the end of the other electrode of the electrode film to which the lead wire of the capacitor film is connected, wrap the capacitor film with the cylindrical bead core as the core, and pierce the center hole of the bead core. Connect the two lead terminals of the U-shaped lead wire to the signal wire, and use the strip electrode connected to the lead wire and the ground terminal connected to the strip electrode on the other end of the capacitor film facing the strip electrode. To form an inverted L-type filter of the child and LC component of the present invention.

That is, according to the present invention, one lead terminal of a U-shaped lead wire is inserted into a central hole of a bead core made of a cylindrical ferrite core having a high relative magnetic permeability characteristic and an electrically insulating coating film formed on the surface thereof. The inductor is connected to one of the strip electrodes of the capacitor film in which the strip electrodes made of conductive film are formed on both sides of the dielectric film having a high dielectric constant at the other lead terminal, and the other end of the strip electrode is connected to the other end. The LC component is characterized in that a capacitor film is wound around the bead core with a ground terminal connected to the bead core as a core.

[0006]

[Action]

 A bead inductor, in which a lead wire is inserted through the center hole of a bead core with an electrically insulating coating on the surface of a cylindrical ferrite core that has a center hole with high relative permeability characteristics, becomes an inductor element that is inserted in series with the signal line. , One lead terminal of the U-shaped lead wire of the bead inductor is connected to one strip-shaped electrode of the capacitor film, the ground terminal is attached to the other end of the other strip-shaped electrode, and the capacitor film is wound around the bead core. Therefore, it is an LC component which has a small board mounting area consisting of a lead terminal and a ground terminal and which removes electromagnetic noise of a signal line forming an inverted L-shaped filter with three terminals.

[0007]

【Example】

 FIG. 1 shows an external perspective view of the LC component according to the present invention, FIG. 2 shows an exploded perspective view of the LC component according to the present invention, and FIG. 3 shows an equivalent circuit of the LC component according to the present invention. As shown in Fig. 2, a bead core 1 made of manganese / zinc ferrite or nickel / zinc ferrite having a high relative magnetic permeability property and an electrically insulating coating on the surface is attached to one of the U-shaped lead wires 2. The terminal is inserted, and the strip electrode 32 of the capacitor film 3 is connected to the other lead terminal. The capacitor film 3 has a strip electrode 32 made of a thin film of a metal conductor formed on both surfaces of a dielectric film 31, and the strip electrode facing the strip electrode 32 connected to a U-shaped lead wire. The other end of 32 is connected to the ground terminal 4 on the capacitor side. The bead core 1 is wrapped around the core of the bead core 1 by gluing it on the surface, and the outer periphery is wrapped with a heat-shrinkable tube or the like to form lead terminals 5 and 6 at both ends of the lead wire 2 and the ground terminal on the capacitor side. 4, an inductor is formed between the lead terminal 5 and the lead terminal 6, and a capacitor is formed between the lead terminal 6 and the ground terminal 4, and the lead terminal 5 side is the input side of the inverted L type. The LC component shown in FIG. 1 in which the filter of FIG.

[0008]

[Effect of the device]

 Since the bead inductor is the core, the capacitor film and the ground terminal are connected to the periphery, and the bead inductor is the core, the film capacitor is wound around the bead inductor. It is possible to provide an effective LC component for preventing electromagnetic noise by reducing the size and mounting it on a signal line that is easy to handle.

[Brief description of drawings]

FIG. 1 is an external perspective view of an LC component according to the present invention.

FIG. 2 is an exploded perspective view showing the structure of an LC component according to the present invention.

FIG. 3 is an equivalent circuit diagram of the LC component of the present invention.

[Explanation of symbols]

 1 Bead Core 2 U-shaped Lead Wire 3 Capacitor Film 31 Dielectric Film 32 Strip Electrode 4 Ground Terminal 5, 6 Lead Terminal

Claims (1)

[Scope of utility model registration request] 1. An inductor in which one lead terminal of a U-shaped lead wire is inserted into a central hole of a bead core made of a cylindrical ferrite core having a high relative magnetic permeability property and an electrically insulating coating film formed on the surface thereof, The other lead terminal is connected to the one strip electrode of the capacitor film in which strip electrodes made of a conductive film are formed on both surfaces of a dielectric film having a high dielectric constant, and the ground terminal is connected to the other end of the other strip electrode. hand,
An LC component comprising the bead core as a core and a capacitor film wound around the bead core.