JPH10163031A - Trimmer inductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and properly set inductance value without shavings copper. SOLUTION: A trimmer inductor is provided with a pair of conductors 2 and 3 for electrode placed on a printed wiring board 1, a conductor 4 for inductor connected to the conductors 2 and 3 for electrode, and a short circuit member 5 which is mourned on the printed wiring board 1 and short-circuits the conductor 4. A specified inductance value is obtained by selecting the mounting position of the short circuit member 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trimmer inductor configured so that an inductance value can be finely adjusted.

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 61-65413, a spiral trimmer thick film conductor is provided between an electrode of an alumina magnetic substrate and a through hole, and an outer portion thereof is provided. And the inner part at a plurality of locations with a trimmer thick film conductor, and a laser and X-
There is known a trimmer inductor configured to adjust the inductance value by sequentially cutting the connection portion made of the thick film conductor using a Y table or the like.

[0003]

As described above, since the connecting portion of the thick film conductor for trimmer installed on the substrate is cut by a laser or the like, expensive manufacturing equipment is required. When the connection portion of the trimmer thick film conductor is cut, it cannot be repaired. Therefore, once the inductance value is set, it cannot be reset.

[0004] In addition, when the shavings of the copper foil generated by cutting the thick film conductor for a trimmer formed of a copper foil pattern or the like come into contact with a peripheral circuit, a short circuit may occur, and such a situation may occur. In order to prevent the occurrence of copper foil shavings by reducing the installation interval of the spiral trimmer thick film conductor in order to prevent the above, the installation interval of the spiral trimmer thick film conductor is reduced There is a problem that stray capacitance is generated due to the small size.

In view of such circumstances, the present invention can set the number of interlinkage magnetic fluxes so that a required inductance value can be obtained without generating copper shavings and the like. It is intended to provide a trimmer inductor which can be reset to a new value.

[0006]

The invention according to claim 1 is
A pair of conductors for electrodes installed on the printed wiring board,
An inductor conductor connected to the electrode conductor;
And a short-circuit member mounted on the printed wiring board for short-circuiting the conductor portion for the inductor, and a specific inductance value can be obtained by selecting a mounting position of the short-circuit member.

According to the above configuration, the mounting position of the short-circuit member mounted by means such as soldering on the printed wiring board is selected, and the short-circuit state of the conductor for inductor is specified. The required inductance value is obtained by adjusting the number of interlinkage magnetic fluxes.

According to a second aspect of the present invention, in the trimmer inductor according to the first aspect, a scale for selecting an inductance value is displayed along an installation portion of the conductor portion for the inductor.

According to the above configuration, the correspondence between the mounting position of the short-circuit member indicated by the scale and the inductance value of the trimmer inductor is determined in advance, and the mounting position of the short-circuit member is selected according to the scale. The required inductance value is obtained.

According to a third aspect of the present invention, there is provided the trimmer inductor according to the first or second aspect, further comprising an inductor conductor portion having a multi-layered conductor pattern disposed concentrically, and a conductor located outside. The pattern and the conductor pattern located inside are connected by a short-circuit member.

According to the above configuration, the number of interlinkage magnetic fluxes of the trimmer inductor is adjusted by selecting the short-circuit position of the inner and outer conductor patterns connected by the short-circuit member and specifying the short-circuit state of the inductor conductor. The required inductance value is obtained.

According to a fourth aspect of the present invention, there is provided a trimmer inductor mounted on a printed wiring board to constitute a parallel resonance circuit, wherein a pair of electrode conductors provided on the printed wiring board are provided. And an inductor conductor having both ends connected to the conductor portion, and mounting the capacitor so that the inductor conductor portion is connected by a capacitor constituting the parallel resonance circuit, and mounting the capacitor at a mounting position. The configuration is such that a specific inductance value can be obtained by selection.

According to the above configuration, by selecting the mounting position of the capacitor mounted on the printed wiring board and specifying the connection state of the inductor conductor, the number of interlinkage magnetic fluxes of the trimmer inductor is adjusted. As a result, a required inductance value corresponding to the capacitance of the capacitor can be obtained.

According to a fifth aspect of the present invention, the scale corresponding to the capacitance of the capacitor constituting the parallel resonance circuit is displayed along the mounting position of the inductor conductor.

According to the above configuration, the correspondence between the mounting position of the capacitor indicated by the scale and the inductance value of the trimmer inductor required in accordance with the capacitance of the capacitor is determined in advance, and the scale is determined. By appropriately selecting the mounting position of the capacitor, an inductance value required as a trimmer inductor of the parallel resonance circuit can be obtained.

[0016]

FIG. 1 shows an embodiment of a trimmer inductor according to the present invention. The trimmer inductor includes a pair of electrode conductors 2 and 3 made of copper foil or the like provided on the printed wiring board 1 and the electrode conductors 2 and 3.
And a short-circuit member 5 mounted on the printed wiring board 1 for short-circuiting the inductor conductor 4.

The inductor conductor 4 is formed in a multiplex structure by a pair of conductor patterns 6 and 7 made of an arc-shaped copper foil disposed on a concentric circle centered on one point on the printed wiring board 1. Both ends of the conductor pattern 6 are connected to the conductors 2 and 3, respectively, and one end of the conductor pattern 7 is connected to the conductor 2.

The short-circuit member 5 has a resistance value of approximately 0Ω.
And is installed so as to straddle the conductor patterns 6 and 7 constituting the conductor portion 4 for the inductor, and is mounted on the printed wiring board 1 by means such as soldering.
By being mounted thereon, the conductor portions 2 and 3 for both electrodes are formed.
It is configured to short-circuit the conductor portion 4 for an inductor that is in a conductive state between them.

The scales 8 are displayed at predetermined intervals along the outer peripheral portion of the outer conductor pattern 6. By selecting the mounting position of the short-circuit member 5 according to the display position of the scale 8, a specific inductance can be obtained. The value is obtained. For example, as shown in FIG. 2, when the short-circuit member 5 is mounted at a position close to the other electrode conductor 3, the above-described FIG.
As shown in FIG. 3, the short-circuit member 5 is connected to one of the electrode conductors 2.
The inductance value is smaller than when mounted at a position close to.

That is, as shown in the schematic diagram of FIG. 3, the two conductor patterns 6, 7 were short-circuited on the line p passing through the center r of the conductor patterns 6, 7 starting from the electrode conductive portion 2 side. In this case, the inductance Lop of the outer conductor pattern 6 and the inductance L of the inner conductor pattern 7
There is a relationship of Lp> Lip with ip. Also,
Since the conductor patterns 6 and 7 are on concentric circles, if the value δ at the start end is ignored, the inductance Lop and Lip are proportional. If the proportional constant of both is α (α <1), then L
ip = α · Lop.

Therefore, when the conductor patterns 6 and 7 are short-circuited on the line p, the conductor sections 2 and 3 for both electrodes are formed.
The combined inductance Lp between them is as shown below. Ll is the total inductance of the outer conductor pattern 6.

Lp = Lop · Lip / (Lop + Lip) + (L1−Lop) = α / (1 + α) · Lop + (L1−Lop) In the above equation, α / (1 + α) = k, and k · Lo
Let p = g (p) and Ll-Lop = h (p)
Then, Lp = kLop + (Ll-Lop) = g (p) + f (p).

The function g (p) is a monotonically increasing function, the function f (p) is a monotonically decreasing function, and the coefficient k = α / (1 + α) is smaller than 1. A graph of the value of the inductance Lp is shown in FIG. 4, and it can be seen that the value of the combined inductance Lp decreases as the short-circuit position approaches the conductive portion 3 for an electrode, that is, approaches p = 1.

Therefore, if the display position of each scale 8 and the inductance value obtained when the short-circuit member 5 is mounted are obtained in advance by experiment or calculation and converted into data, the data selected based on this data can be obtained. By selecting the mounting position of the short-circuit member 5 based on the position of the scale 8,
The required inductance value can be easily and accurately obtained. Since various factors such as the print pattern width of the conductor patterns 6 and 7 and the value δ of the start end are related to the actual inductance value, the short-circuit member 5 is determined based on a value measured by a measuring device. It is desirable to digitize the inductance value obtained when mounting is implemented.

As described above, a pair of conductors 2 and 3 for electrodes provided on the printed wiring board 1 and a pair of conductor patterns 6 and 7 connected to the conductors 2 and 3 for inductors A conductor part 4 and a short-circuit member 5 mounted on the printed wiring board 1 for short-circuiting the inductor conductor part 4 are provided, and a specific inductance value can be obtained by selecting a mounting position of the short-circuit member 5. Therefore, the required inductance value can be obtained by installing and soldering the short-circuit member 5 at a predetermined position on the conductor patterns 6 and 7.

Therefore, the required inductance value can be obtained without using expensive manufacturing equipment, unlike the conventional example in which the inductance value is adjusted by cutting the inductor conductor 4 with a laser or the like. Since the shavings of the copper foil forming the inductor conductor 4 are not generated, there is an advantage that the shavings can be prevented from contacting peripheral circuits and causing a short circuit.

Further, if it is confirmed that the mounting position is incorrect after mounting the short-circuit member 5, or if it is necessary to set a different inductance value, the soldering of the short-circuit member 5 is performed. By changing the mounting position again, the number of interlinkage magnetic fluxes of the inductor can be adjusted and the inductance value can be easily changed any number of times.

In the above embodiment, the scale 8 for selecting the inductance value is displayed along the installation position of the conductor portion 4 for the inductor. By selecting the mounting position of the short-circuit member 5 with reference to the specific scale 8 based on the position of the scale 8, fine adjustment of the inductance value can be performed easily and accurately.

Further, as shown in the above-described embodiment, an inductor conductor portion composed of a pair of conductor patterns 6 and 7 made of an arc-shaped copper foil and placed on a concentric circle centered on one point on the printed wiring board 1. 4 is provided, and the conductor pattern 6 located on the outside and the conductor pattern 7 located on the inside are connected by the short-circuit member 5.
The inductance value can be finely adjusted easily and appropriately according to the difference in radius between the conductor patterns 6 and 7 and the like.
In addition, since a sufficient interval between the conductor patterns 6 and 7 can be ensured, the occurrence of stray capacitance can be effectively prevented.

In the above embodiment, the example in which the conductor portion 4 for the inductor is constituted by a pair of conductor patterns 6 and 7 made of an arc-shaped copper foil has been described. However, the shape and size of the conductor patterns 6 and 7 are described. The size, number and the like can be arbitrarily changed. For example, the conductor pattern may be formed in a multiplex structure of three or more layers, or may be formed in a square or a rectangle.

As shown in FIG. 3, in a parallel resonance circuit in which a trimmer inductor 10 and a capacitor 11 are mounted on a printed wiring board 1, both ends are connected to electrode conductors (not shown). U-shaped inductor conductor 1
2 to form a trimmer inductance 10, mount the capacitor 11 so as to connect the inductor conductor 12, and select a mounting position of the capacitor 11 to obtain a specific inductance value. You may.

According to the above configuration, the mounting position of the capacitor 11 is displaced to the left and right in FIG. Since the number of interlinkage magnetic fluxes can be increased or decreased, a required inductance value corresponding to the capacitance of the capacitor 11 can be easily and appropriately obtained.

If the scale 14 corresponding to the capacitance of the capacitor 11 is displayed along the mounting position of the conductor 12 for the inductor, the scale 14
The relationship between the mounting position of the capacitor 11 indicated by the symbol and the inductance value of the trimmer inductor 10 required corresponding to the capacitance of the capacitor 11 is obtained in advance and converted into data. By selecting the mounting position of 11, the inductance value required for the trimmer inductor 10 of the parallel resonance circuit can be easily and appropriately set.

That is, the capacitor 11 has a manufacturing error. For example, in the case of the capacitor 11 of 10 pF, there is a tolerance of about ± 0.5 pF. Are displayed along the mounting position of the conductor portion 12 for the inductor. Before mounting the capacitor 11, the capacitance is measured by an impedance analyzer, the position of the scale 14 corresponding to the measured value is selected, and the mounting position of the capacitor 11 is selected. The inductance value required for the inductor 10 can be easily and appropriately set.

[0035]

As described above, according to the first aspect of the present invention, a pair of conductors for electrodes provided on a printed wiring board, a conductor for inductors connected to the conductors for electrodes, A short-circuit member that is mounted on the printed wiring board and short-circuits the conductor portion for the inductor, and a specific inductance value is obtained by selecting a mounting position of the short-circuit member. In addition, the required inductance value can be obtained properly without the short circuit of the peripheral circuit due to the shavings of the copper foil, and this inductance value can be easily changed many times. .

According to the second aspect of the present invention, since the scale for selecting the inductance value is displayed along the installation portion of the conductor portion for the inductor, the inductance value and the scale obtained in advance by experiment or the like and converted into data are displayed. By selecting the mounting position of the short-circuit member on the basis of a specific scale based on the position, the fine adjustment operation of the inductance value can be easily and accurately executed.

According to a third aspect of the present invention, there is provided an inductor conductor comprising a multi-layered conductor pattern disposed concentrically, wherein an outer conductor pattern and an inner conductor pattern are provided. Are connected by a short-circuit member. By changing the connection position of the short-circuit member, the number of interlinkage magnetic fluxes of the inductor can be increased / decreased to easily and appropriately fine-tune the inductance value. There is an advantage that a sufficient space can be ensured to effectively prevent the generation of stray capacitance.

According to a fourth aspect of the present invention, there is provided a trimmer inductor mounted on a printed wiring board to form a parallel resonance circuit, wherein the pair of electrode conductors provided on the printed wiring board, And an inductor conductor having both ends connected to the conductor portion, and mounting the capacitor so as to connect the inductor conductor by a capacitor constituting the parallel resonance circuit, and setting a mounting position of the capacitor. Since the configuration is such that a specific inductance value is obtained by selection, the mounting position of the capacitor is displaced, and the length of the inductor conductor portion installed in parallel with the capacitor is changed, so that the inductance of the inductor is changed. The required inductance value corresponding to the capacitance of the above capacitor can be easily and It can be positively obtained.

In the invention according to claim 5, the scale corresponding to the capacitance of the capacitor constituting the parallel resonance circuit is displayed along the mounting position of the conductor portion for the inductor. The inductance value required as the trimmer inductor of the parallel resonance circuit is obtained by previously obtaining the correspondence relationship with the required inductance value of the trimmer inductor and converting it into data, and selecting the mounting position of the capacitor according to the above scale. Can be easily and appropriately set.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a trimmer inductor according to the present invention.

FIG. 2 is an explanatory view showing a state where the installation position of a short-circuit member of the trimmer inductor is displaced.

FIG. 3 is an explanatory diagram showing a calculation example of an inductance value.

FIG. 4 is a graph showing a relationship between an inductance and a short-circuit position.

FIG. 5 is an explanatory view showing another embodiment of the trimmer inductor according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board 2, 3 Conductor part for electrodes 4 Conductor part for inductor 5 Short-circuit member 6, 7 Conductor pattern 8 Scale 10 Trimmer inductor 11 Capacitor 12 Conductor part for inductor 14 Scale

Claims (5)

[Claims] 1. A pair of conductors for electrodes installed on a printed wiring board, a conductor for inductors connected to the conductors for electrodes, and a conductor for inductors mounted on the printed wiring board. And a short-circuit member for short-circuiting, wherein a specific inductance value is obtained by selecting a mounting position of the short-circuit member. 2. The trimmer inductor according to claim 1, wherein a scale for selecting an inductance value is displayed along the installation portion of the conductor portion for the inductor. 3. An inductor conductor portion comprising a multi-layered conductor pattern disposed concentrically is provided so that an outer conductor pattern and an inner conductor pattern are connected by a short-circuit member. The trimmer inductor according to claim 1, wherein the inductor is configured. 4. A trimmer inductor mounted on a printed wiring board to form a parallel resonance circuit, comprising: a pair of electrode conductors provided on the printed wiring board; And an inductor conductor connected thereto, and mounting the capacitor so as to connect the inductor conductor by a capacitor constituting the parallel resonance circuit, and selecting a mounting position of the capacitor to specify a specific position. A trimmer inductor configured to obtain an inductance value. 5. The trimmer inductor according to claim 4, wherein a scale corresponding to a capacitance of a capacitor forming the parallel resonance circuit is displayed along a mounting position of the inductor conductor.