JP2011129747A - Coil for high-frequency equipment and the high-frequency equipment equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide, at a low cost, a coil for high-frequency equipment applicable to thin-type high-frequency equipment and readily manufactured. <P>SOLUTION: The coil (22) for high-frequency equipment mounted on a circuit board (18) extends along a first axis. The coil (22) has a winding part (24) and the winding part (24) is constituted of a spirally wound insulating coating wire and is shear-deformed in a direction along its axis. An outer diameter DC of the winding part (24) in a direction orthogonal to the circuit board (18) when mounted on the circuit board (18) is smaller than a maximum outer diameter DL of each loop (28) constituting the winding part (24) in an inclination direction to the circuit board (18). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a coil for a high-frequency device.

Some high-frequency devices such as TV tuners have an air core coil built in as a countermeasure against high voltage (thunderbolt countermeasures) that occurs when a lightning strikes nearby.
The air-core coil is located on the input side of the electric circuit provided in the high-frequency device, and connects the signal line of the electric circuit and the ground electrode. The air-core coil does not pass high-frequency electrical signals, and passes only high-voltage direct current from lightning to the ground electrode. As a result, the electric circuit of the high-frequency device is protected from destruction due to high pressure.

An air-core coil for lightning protection built in a high-frequency device is made of a thick conducting wire for flowing a large current, and has a large cross-sectional area and a large number of turns in order to increase inductance. For this reason, the air-core coil for lightning countermeasures must be large, and cannot be mounted on a thin high-frequency device.
Therefore, the coil disclosed in Patent Document 1 is compressed in the radial direction, and the height of the coil when mounted on a circuit board is reduced.

Hei 2-74014

  However, in order to compress a coil having a large conductor diameter in the radial direction, it is necessary to introduce a large press device, which increases the manufacturing cost.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a coil for a high-frequency device that can be applied to a thin high-frequency device and can be easily manufactured at low cost.

  In order to solve the above problems, the present invention employs the following solutions.

  Solution 1: According to one aspect of the present invention, in a coil for a high-frequency device that extends along one axis and is mounted on a circuit board, the coil includes an insulation-coated conductive wire wound in a spiral shape, and the axis is When the winding portion is sheared and deformed in the direction along which it is mounted and mounted on the circuit board, the outer diameter of the winding portion in the direction orthogonal to the circuit board is equal to each of the winding portions. There is provided a coil for a high-frequency device, wherein the coil is smaller than a maximum outer diameter in a tilt direction with respect to the circuit board of the loop.

  The coil for the high-frequency device of the solution 1 is such that when the winding portion is shear-deformed, the outer diameter of the winding portion in the direction perpendicular to the circuit board is reduced when mounted on the circuit board. The winding portion is sheared and deformed with a smaller pressure than in the case of compressive deformation. For this reason, even if it is a coil with a large diameter of conducting wire, the outer diameter of a winding part is easily reduced using a general purpose installation.

According to another aspect of the present invention, there is provided a high frequency device comprising: a case; and a circuit board housed in the case and mounted with the coil for the high frequency device according to claim 1. Equipment is provided.
In the high frequency device of Solution 2, even if the case is thin, the coil is accommodated in the case by reducing the outer diameter of the coil winding portion.

  According to the present invention, a coil for a high-frequency device that can be applied to a thin high-frequency device and can be easily manufactured is provided at a low cost.

1 is a perspective view schematically showing a television tuner according to an embodiment. FIG. 2 is a side view showing the television tuner of FIG. It is a figure which expands and shows the coil in FIG. 2, and its vicinity. It is a perspective view of the coil in FIG. It is a figure for demonstrating the shaping | molding method of the coil in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view schematically showing a television tuner 10 as a high-frequency device according to an embodiment. The television tuner 10 is built in a thin image display device such as a liquid crystal television, and is mounted on a set substrate of the image display device.

The TV tuner 10 has a flat box-shaped housing 12, and the wide surfaces facing each other in the thickness direction of the housing 12 are constituted by metal covers 12 a and 12 b, Is constituted by a metal frame member 12c. The covers 12a and 12b are fixed to the frame member 12c, and the housing 12 has a function as a shield case.
The thickness of the housing 12 is, for example, 4.0 mm or more and 7.0 mm or less.

A plurality of terminals 14 protrude from one surface of the frame member 12c. The terminal 14 is connected to a connector provided on the set substrate of the image display device.
A high frequency coaxial connector 16 protrudes from the other surface of the frame member 12c. The coaxial connector 16 is an antenna input terminal, and is electrically connected to an external antenna via a coaxial cable.

  As shown in FIG. 2, a circuit board 18 is installed in the housing 12 in parallel to the covers 12a and 12b. The circuit board 18 has an IC chip 20 or the like constituting a television broadcast receiving circuit. Has been implemented. In FIG. 2, only the housing 12 is shown in cross section.

In addition, a coil 22 is mounted on the circuit board 18 to protect the receiving circuit from high voltage during a lightning strike. The coil 22 is provided on the input side of the receiving circuit, and connects the signal line of the receiving circuit and the ground electrode.
As shown in an enlarged view in FIG. 3, the coil 22 includes a winding portion 24 formed by spirally winding an insulating coated conductor, and lead portions 26 a and 26 b integrally connected to both ends of the winding portion 24. Have The leading ends of the lead portions 26 a and 26 b are not covered and are soldered to the land portion of the circuit board 18.

  The insulation-coated conductor constituting the coil 22 has a diameter of, for example, 0.25 mm to 0.5 mm. And the winding frequency of the winding part 24 is 10 times or more and 25 times or less, for example.

  4 together with FIG. 4, the winding portion 24 is sheared and deformed along the axis of the coil 22 that penetrates the radial center of the winding portion 24 in the longitudinal direction. In other words, since the coil 22 is disposed along the circuit board 18, it is sheared along the circuit board 18.

For this reason, each of the plurality of continuous loops 28 constituting the winding portion 24 is inclined at a constant angle with respect to the axis of the coil 22 and the circuit board 18. The outer diameter DL in the inclination direction of the loops 28 is, for example, not less than 2.5 mm and not more than 5.0 mm. The outer diameter DC of the winding portion 24 in the direction perpendicular to the circuit board 18, that is, the mounting height of the coil 22 when mounted on the circuit board 18 is, for example, 2.0 mm or more and 3.5 mm or less. Yes, smaller than the outer diameter DL of the loop 28 in the inclination direction.
When the sizes of the loops 28 are uneven, the outer diameter DC of the winding portion 24 in the direction perpendicular to the circuit board 18 is smaller than the maximum outer diameter DL in the inclination direction of the loop 28.

FIG. 5 shows a method for forming the coil 22. By applying a force to one end of the winding part 24 in a state where the circuit board 18 side of the coil 22 is fixed, the winding part 24 is sheared and deformed. The portion to which the force is applied is on the side opposite to the circuit board 18 in the radial direction of the winding portion 24, and the force is applied slightly obliquely along the axial direction of the coil 22 so as to push down each loop 28. .
When forming the coil 22, the coil 22 may be fixed to a base other than the circuit board 18.

In the television tuner 10 of one embodiment described above, the coil 22 has a large inductance. The coil 22 releases current from the signal line to the ground electrode when a large current flows into the signal line of the receiving circuit due to lightning.
On the other hand, the coil 22 has a large impedance for high-frequency electrical signals. Therefore, for example, when a high frequency electric signal of 50 MHz or more and 1 GHz or less flows through the signal line of the receiving circuit, the electric signal is prevented from escaping to the ground electrode.

And in coil 22 of one embodiment mentioned above, when winding part 24 is shear-deformed and mounted in circuit board 18, the outside diameter of winding part 24 in the direction perpendicular to circuit board 18 is shown. DC is reduced. The winding portion 24 is sheared and deformed with a smaller pressure than in the case of compressive deformation. For this reason, even if it is the coil 22 with which the diameter of conducting wire is large, the outer diameter of the winding part 24 is easily reduced using a general purpose installation.
In the television tuner 10 of the above-described embodiment, even when the casing 12 is thin, the coil 22 is accommodated in the casing 12 by reducing the outer diameter DC of the winding portion 24 of the coil 22. Is done.

The present invention is not limited to the above-described embodiment, and includes a form obtained by modifying the embodiment.
For example, each loop 28 of the winding portion 24 of the coil 22 is circular before being sheared, but may be elliptical.
The coil 22 is suitable for a lightning countermeasure coil, but may be used for other applications in high-frequency equipment.
Finally, the high-frequency device to which the coil according to the present invention is applied is not limited to the television tuner.

10 TV tuner (high frequency equipment)
12 Case (Shield case)
14 terminal 16 coaxial connector (antenna input terminal)
18 Circuit board 20 IC chip 22 Coil 24 Winding part 26a, 26b Lead part 28 Loop

Claims (2)

In a coil for a high-frequency device that extends along one axis and is mounted on a circuit board,
A winding portion that is formed of an insulation-coated conductive wire wound spirally and is shear-deformed in a direction along the axis;
When mounted on the circuit board, the outer diameter of the winding portion in the direction orthogonal to the circuit board is larger than the maximum outer diameter in the inclination direction with respect to the circuit board of each loop constituting the winding portion. A coil for high-frequency equipment characterized by being small. Case and
A high frequency device comprising: a circuit board housed in the case and mounted with the coil for a high frequency device according to claim 1.

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