JP3092518B2 - Variable capacitor and LC composite component using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable capacitor and an LC composite component using the same, and more particularly to an improvement in a rotor holding structure of the variable capacitor.

[0002]

2. Description of the Related Art FIGS. 15 and 16 show an LC composite component 1 which is of interest to the present invention. FIG. 17 shows an equivalent circuit provided by the LC composite component 1. The LC composite component 1 is incorporated in, for example, an RF modulator used for a video deck, a television receiver, or the like.

[0003] As shown in FIG.
A combination of a variable capacitor 2 and a coil 3 connected in series to each other, wherein a first terminal 4 connected to one end of the variable capacitor 2 and a connection between the other end of the variable capacitor 2 and one end of the coil 3 And a third terminal 6 connected to the other end of the coil 3.

[0004] As shown in FIGS. 15 and 16, the LC composite component 1 includes an electrically insulating substrate 7. The variable capacitor 2 provided in the LC composite component 1 uses air as a dielectric and includes a rotor 8 and a stator 9. The rotor 8 and the stator 9 are held by a substrate 7.

More specifically, the rotor 8 is made of metal as a whole, and includes an adjustment shaft 10 and a plurality of, for example, semicircular rotor-side electrodes 11 projecting from the adjustment shaft 10. The adjustment shaft 10 penetrates the substrate 7, and a spring washer 12 and a retaining ring 13 are fitted on the adjustment shaft 10 on the lower surface side of the substrate 7, and the lower end of the adjustment shaft 10 is caulked, so that the adjustment shaft 10 7 so as to be rotatable. The base 14 of the first terminal 4 is
The first terminal 4 is mechanically held on the substrate 7 and is electrically connected to the rotor 8 by being sandwiched between the substrate 7 and the spring washer 12. An adjusting groove 15 is formed at the upper end of the adjusting shaft 10 so that an adjusting tool such as a screwdriver can be engaged with the adjusting groove. Such a rotor 8 is usually configured as an integrated cutting part.

On the other hand, the stator 9 includes a plurality of stator-side electrodes 16 and spacers 17 inserted between the stator-side electrodes 16. The second terminal 5 is attached so as to penetrate the substrate 7 and further has a stator-side electrode 16.
And through the spacer 17 and soldered to the stator-side electrode 16 and the spacer 17,
These are fixed to the terminal 5. Stator side electrode 1
6 is positioned so as to be inserted into the space between the rotor-side electrodes 11 according to the rotation of the rotor 8 described above.

The variable capacitor 2 is realized by the configuration described above. That is, a capacitance is formed by the rotor-side electrode 11 and the stator-side electrode 16 facing each other via air as a dielectric, and this capacitance is taken out between the first and second terminals 4 and 5. It is. When the rotor 8 is rotated, the effective facing area between the rotor-side electrode 11 and the stator-side electrode 16 is changed, thereby changing the capacitance.

The coil 3 is an air-core coil, one end of which is soldered to a stator 9 and the other end of which is a substrate 7
To form the third terminal 6 described above. In this way, as shown in FIG. 17, the variable capacitor 2 and the second terminal 5 are connected to one end of the coil 3 and the third terminal 6 is connected to the other end of the coil 3 as well. Is obtained.

Further, the variable capacitor 2 and the coil 3
The shield cover 18 is attached to the substrate 7 so that The shield cover 18 has an opening 19 that exposes the adjustment groove 15 of the adjustment shaft 10.

[0010]

However, the above-described LC composite component 1 has the following problems to be solved, particularly with respect to the variable capacitor 2.

First, since the variable capacitor 2 uses air as a dielectric, it is necessary to increase the area of the rotor side electrode 11 and the stator side electrode 16 in order to obtain a desired capacitance. As a result, it is susceptible to surrounding stray capacitance.

Such an LC composite component 1 is standardized in terms of its external dimensions, arrangement of terminals 4 to 6, and the position of adjustment shaft 10. Therefore, if the area of the rotor-side electrode 11 is increased as described above, particularly after the position of the adjustment shaft 10 is determined, the rotor-side electrode 11 is designed to protrude from the shield cover 18 at a specific rotation position. There is. To cope with this, the shield cover 18 is provided with a window 20 that allows the rotor-side electrode 11 to protrude. As a result, the dustproof effect and the shielding effect of the shield cover 18 are reduced.

An adjusting shaft 1 having a rotor-side electrode 11
Since cutting is used to obtain 0 and the number of components for obtaining the structure on the side of the stator-side electrode 16 is relatively large, cost reduction is hindered.

Further, the first terminal 4 is connected to the rotor side electrode 11.
In the electrical conduction path leading to, there is an electrical connection portion by sliding contact between the base 14 of the terminal 4 and the adjustment shaft 10 or the spring washer 12, so that electrical contact is caused by corrosion or dirt of the sliding contact portion. May be inhibited.
As a result, the function of the variable capacitor 2 and thus the LC composite component 1 may be impaired.

If the adjusting shaft 10 is tilted during the capacity adjustment,
The distance between the rotor-side electrode 11 and the stator-side electrode 16 changes, and the capacitance changes accordingly, making adjustment difficult.

An object of the present invention is to provide a variable capacitor capable of solving the above-mentioned problem and an LC composite component using the same.

[0017]

The variable capacitor according to the present invention is characterized by having the following configuration in order to solve the above-mentioned technical problem.

First, the variable capacitor according to the present invention comprises:
An electrically insulating substrate having first and second stator-side electrodes formed on one main surface thereof with a space therebetween is provided. A rotor made of a dielectric is arranged so as to contact the first and second stator-side electrodes. The rotor holds a rotor-side electrode. The rotor side electrode is
First and second capacitances are respectively formed by facing the first and second stator-side electrodes via at least a part of the rotor.
And the second capacitance is connected in series.

Further, the adjustment member is held so as to rotate around an axis perpendicular to one main surface of the substrate. This adjustment member has a skirt portion on one end side where a space for accommodating the rotor is formed on an inner peripheral side thereof and an end surface of which is in contact with one main surface of the substrate, and an adjustment tool is provided on the other end side. It has an adjusting shape portion that can be engaged, and is electrically insulated from the first and second stator-side electrodes and the rotor-side electrode.

Further, the variable capacitor is disposed between the adjusting member and the rotor in the skirt portion, and a contact maintaining means for maintaining the skirt portion of the adjusting member in contact with the one main surface of the substrate. A rotation transmitting member made of an elastic body, which presses the rotor toward one main surface of the substrate and transmits the rotation of the adjusting member to the rotor to rotate the rotor together with the adjusting member. Also,
In the invention of the first aspect, the first and second substrates are provided on one main surface of the substrate.
2 through the first and second extraction electrodes from the second stator side electrode.
And connected to the skirt of the adjustment member
The first and second terminal electrodes located outside the region where
The first and second extraction electrodes are formed and the adjustment member slides.
Wider in the area where it contacts the cart than in other areas
It is said.

In a preferred embodiment according to the present invention, the adjusting member has a shaft portion for providing the above-mentioned axis serving as the center of rotation, and the substrate and the rotor have a bearing hole passing through the shaft portion, and the contact maintaining member described above. The means includes an engagement member that engages with the shaft on the other main surface side of the substrate to prevent the shaft from being removed from the bearing hole. In this embodiment, the contact maintaining means further includes a resilient member having a spring property which is disposed between the other main surface of the substrate and the engaging member and biases the engaging member in a direction to separate the engaging member from the substrate. You may have.

In another preferred embodiment according to the present invention, the variable capacitor further includes a wall portion having an opening facing the one main surface of the substrate and exposing an adjusting shape portion of the adjusting member, and the contact maintaining means includes: There is provided a pressing member having a spring property for urging the wall portion and the adjusting member in a direction of separating from each other.

In the present invention, preferably, the above-mentioned rotation transmitting means is constituted by an O-ring. At this time, a ring-shaped groove for positioning the O-ring is formed in the adjusting member. More preferably, the bottom surface of the groove is provided with an uneven shape.

The variable capacitor according to the present invention can be used in other stations.
In terms of surface, the above-mentioned substrate, rotor, rotor side electrode, adjustment unit
Material, contact maintaining means, and rotation transmitting member
And adjust the adjustment member facing one main surface of the substrate.
Further comprising a wall having an opening for exposing the trimming shape portion;
The contact maintaining means separates the wall and the adjustment member from each other.
A pressing member having a spring property for urging in a separating direction is provided.
You.

The present invention is also directed to an LC composite component using the above-described variable capacitor. This LC composite component has a configuration provided in the above-described variable capacitor, that is, an adjustment including a substrate on which first and second stator-side electrodes are formed, a rotor, a rotor-side electrode, a skirt portion, and an adjustment shape portion. The following configuration is provided in addition to the member, the contact maintaining unit, and the rotation transmitting member.

First, not only the first and second stator-side electrodes but also the first and second stator-side electrodes connected to the substrate via the first and second lead-out electrodes, respectively. A third terminal electrode is formed independently of the second terminal electrode and the first and second terminal electrodes. The LC composite component has an inductor connected between the second and third terminal electrodes, and an opening for exposing an adjustment shape portion of the adjustment member.
A shield cover attached to the substrate to accommodate the adjustment member and the inductor.

[0027]

1 to 3 illustrate an LC composite part 21 according to a first embodiment of the present invention. This LC composite part 21 is the same as that of FIG.
The variable capacitor 22 corresponding to the variable capacitor 2 shown in FIG. 17, the coil 23 corresponding to the coil 3, and the first, second and third terminals 4, 5 and The first, each corresponding to 6,
Second and third terminals 24, 25 and 26 are provided. Also, consideration is given to the LC composite component 21 so that it can be used interchangeably with the LC composite component 1 shown in FIGS.

The LC composite component 21 has a substrate 27 made of an electrically insulating material such as alumina. Substantially semicircular first and second stator-side electrodes 28 and 29 are formed on one main surface of the substrate 27, that is, on the upper main surface in the state shown in FIG. Also, on the main surface, first and second stator-side electrodes 2 are provided.
First and second terminal electrodes 32 and 33 are formed from first and second electrodes 8 and 29 via first and second extraction electrodes 30 and 31, respectively, and first and second terminal electrodes 32 and 33 are formed. The third terminal electrode 34 is formed independently of the above. On this main surface of the substrate 27, a play electrode 35 is formed on the side opposite to the position where the third terminal electrode 34 is formed.

The electrodes 28 to 35 are formed, for example, by applying and baking a conductive paste on the substrate 27. After baking, in order to improve characteristics such as setting drift and Q, preferably, the electrodes 28 to
35 is mirror-polished. The first and second stator-side electrodes 28 and 29, the third terminal electrode 34, and the idle electrode 35 are formed thick by, for example, applying a conductive paste twice. Even if warpage occurs, the first and second stator electrodes 28 and 29 are appropriately polished.

The substrate 27 is provided with a bearing hole 36 penetrating between the first and second stator electrodes 28 and 29, and the first, second and third terminal electrodes 32, 3
Through holes 37, 38 are formed in each of the areas where 3 and 34 are formed.
And 39 are provided respectively.

For example, a disk-shaped rotor 40 is arranged so as to contact first and second stator electrodes 28 and 29 on substrate 27 described above. The rotor 40 is made of a dielectric such as a ceramic dielectric. At the center of the rotor 40, a bearing hole 41 is provided to be aligned with the bearing hole 36 of the substrate 27.

On the upper main surface of the rotor 40 in the illustrated state, substantially semicircular first and second rotor-side electrodes 42 and 43 are formed at an interval from each other. These first and second rotor-side electrodes 42 and 43 are respectively
The first and second stator electrodes 28 and 29 are opposed to each other via the rotor 40. At this time, the first rotor-side electrode 42 is connected to the first and second stator-side electrodes 28.
And 29, the first and second capacitances are formed respectively, and the first and second capacitances are formed.
Are connected in series. On the other hand, the second rotor-side electrode 42 forms third and fourth capacitances by facing the first and second stator-side electrodes 28 and 29, respectively, and the third and fourth capacitances are formed. Connect the capacitance in series.

A variable capacitor having an electrode formation mode such as the first and second stator-side electrodes 28 and 29 and the first and second rotor-side electrodes 42 and 43 is disclosed in, for example, Japanese Utility Model Laid-Open No. 58-133926. It is described in the gazette.

The first and second capacitances and the third and fourth capacitances, which are respectively connected in series as described above, correspond to the first and second stator electrodes 28 and 2 respectively.
9 and the first and second rotor-side electrodes 42 and 43 are provided as the rotor-side electrodes, a larger maximum capacitance can be obtained. If you do not want any significant benefits,
And only one of second rotor-side electrodes 42 and 43 may be provided.

The rotor-side electrodes 42 and 43 are usually provided by a conductive film formed on the surface of the rotor 40, but are provided by a separately prepared metal plate or metal foil. May be mounted to be held on the surface of the. Further, the rotor may have a laminated structure, and a rotor-side electrode may be formed therein. In the latter case, the rotor-side electrode can be opposed to the stator-side electrode through a part of the thickness of the rotor, so that a large maximum capacitance is obtained while securing sufficient mechanical strength in the rotor. be able to.

The adjustment member 44 is held so as to rotate around an axis perpendicular to the upper main surface of the substrate 27. More specifically, the adjusting member 44 includes a shaft portion 45 that provides an axis of rotation, and the shaft portion 45 passes through the bearing hole 41 of the rotor 40 and the bearing hole 36 of the substrate 27.

The adjusting member 44 has a skirt portion 46 at its lower end, which forms a space for accommodating the rotor 40 on the inner peripheral side. The end surface of the skirt portion 46 contacts the upper main surface of the substrate 27. Thus, the skirt portion 46 has an additional effect of preventing dust from entering between the rotor 40 and the substrate 27. Adjusting member 4
4 forms a step portion 47 on its outer peripheral surface, whereby the portion above the portion where the skirt portion 46 is formed is made thinner.

On the upper end side of the adjusting member 44, an adjusting shape portion which can be engaged with an adjusting tool (not shown) such as a screwdriver, for example, an adjusting groove 4 is provided.
Eight. The adjusting shape portion may be provided with a shape other than the groove.

The adjusting member 44 is preferably formed integrally from an electrically insulating material. As the electrically insulating material, for example, a thermoplastic resin such as a polyamide resin, polybutylene terephthalate, a liquid crystal resin, and polyphenylene sulfide, or a ceramic material can be used. When a resin is used, it is preferable to use a resin having a high heat deformation temperature in order to secure stability against heat received when soldering the LC composite component 21 and long-term use at high temperatures.

The adjusting member 44 does not need to be entirely made of an electrically insulating material. At least the stator side electrodes 28 and 29 and the rotor side electrodes 42 and 43 are required.
It is sufficient that the material is in an electrically insulated state, and only necessary parts may be made of an electrically insulating material.

The skirt portion 46 of the adjusting member 44 is
In this embodiment, as a contact maintaining means for maintaining the upper main surface of the base 7 in contact with the upper main surface, the lower main surface side of the substrate 27 engages with the shaft portion 45 and the bearing hole 36
And 41 is provided with an engagement member for preventing detachment. The engagement member is comprised of a push nut 49 in this particular embodiment. The push nut 49 is
It is fitted into the shaft 45 from its lower end, but after being fitted, it bites into the shaft 45 so that it does not come off the shaft 45.

The contact maintaining means further includes a spring washer 50 as a resilient member. The spring washer 50 is fitted to the shaft 45 before fitting the push nut 49, and is disposed between the lower main surface of the substrate 27 and the push nut 49. Spring washer 50
Has a spring property for urging the push nut 49 in a direction to separate the push nut 49 from the substrate 27.

As described above, when the spring washer 50 is provided, there is an advantage that the skirt portion 46 can be surely brought into contact with the substrate 27. However, if such an advantage is not desired, the spring washer 50 is replaced with the spring washer 50. Alternatively, the push nut 49 may be brought into direct contact with the lower main surface of the substrate 27.

As described above, the skirt portion 46 is
, The first and second terminal electrodes 24 and 25 are located outside the area where the skirt portion 46 contacts, and the skirt portion 46 is connected to the first and second extraction electrodes 30 and 31. Also contact. Therefore, when the rotation of the adjusting member 44 is repeated, the skirt portion 46 repeatedly rubs the extraction electrodes 30 and 31, and thus the disconnection may occur in the extraction electrodes 30 and 31. In order to make such disconnection less likely to occur, in this embodiment, the first and second extraction electrodes 30 and 31
The portions 30a and 31a that contact the skirt portion 46 are wider than the other portions. Since the extraction electrodes 30 and 31 are widened at the portions 30a and 31a that come into contact with the skirt portion 46,
Not only can the disconnection hardly occur, but also the rattling in the rotation of the adjusting member 44 can be hardly generated.

In the skirt portion 46, between the adjusting member 44 and the rotor 40, the rotor 40 is pressed toward the upper main surface of the substrate 27, and the rotation of the adjusting member 44 is transmitted to the rotor 40 to A rotation transmitting member made of an elastic body for rotating the member with the adjusting member 44 is disposed. This rotation transmitting member is provided by an O-ring 51 in this embodiment. The adjusting member 44 has O
A ring-shaped groove 52 for positioning the ring 51 is formed.

As described above, the O-ring 51 and the adjusting member 44
And the friction between the rotor 40 and the rotor 40, and the friction causes the rotor 40 to rotate together with the adjustment member 44.
The rotor 40 is pressed toward the substrate 27 according to the elasticity of the O-ring 51. In addition, it is preferable that the deformation at the time of mounting the O-ring 51 occurs in a range smaller than its elastic limit.

The first terminal 24 described above has a base 53
Penetrates through the through hole 37 from below the substrate 27 and is soldered to the first terminal electrode 32. Illustration of the solder applied by this soldering is omitted.

The coil 23 constitutes an inductor. In this embodiment, the coil 23 is constituted by an air-core coil. The coil 23 may be configured using a chip inductor or an inductor formed by a wiring pattern on the substrate 27 in addition to the air-core coil. One end of the coil 23 is inserted into the through hole 38 from above the substrate 27 and is pulled out below the substrate 27. This one end is soldered to the second terminal electrode 33 and constitutes the second terminal 25 described above. The other end of the coil 23 is inserted into the through hole 39 from above the substrate 27 and is pulled out to below the substrate 27. The other end is soldered to the third terminal electrode 34 and constitutes the third terminal 26 described above. The illustration of the solder applied in the soldering is omitted.

The second and third terminals 25 and 2
6 is not constituted by the end of the coil 23,
You may comprise by the member prepared separately.

The shield cover 54 is attached to the board 27 so as to accommodate the adjustment member 44 and the coil 23. The shield cover 54 is provided with the adjusting groove 4 of the adjusting member 44.
8 is exposed. However, the shield cover 54 has the window 2 shown in FIG.
No window corresponding to 0 is formed.

The shield cover 54 is made of the LC composite component 21.
Protects the inside of the device and provides a shielding effect, and is made of, for example, a conductive material such as metal. The shield cover 54 has a plurality of bent pieces 56 and a plurality of cut-and-raised pieces 57 with a part of itself.
The shield cover 54 is positioned with respect to the substrate 27 by sandwiching the edge of the substrate 27 between the bent piece 56 and the cut-and-raised piece 57.

The shield cover 54 also extends below the substrate 27, and the shaft 45 and the like of the adjusting member 44 are located in a space formed inside the shield cover 54. Further, a ground terminal 58 is formed to protrude further downward from the lower end edge of the shield cover 54.

The shield cover 54 is made of a metal such as a liquid crystal resin or the like, which is easily plated, and plated with a metal such as nickel or a resin provided with conductivity. Is also good.

The LC composite component 21 constructed as described above
Gives the equivalent circuit shown in FIG.
Is formed between the first and second terminals 24 and 25. Further, the inductance formed by the coil 23 is taken out between the second and third terminals 25 and 26. The capacitance is made variable by rotating the adjustment member 44.
The rotor 40 is oriented such that the space between the first and second rotor electrodes 42 and 43 is orthogonal to the space between the first and second stator electrodes 28 and 29 as shown in FIG. In this case, the capacitance is maximized, and on the other hand, the first and second rotor-side electrodes 42 are located at the intervals between the first and second stator-side electrodes 28 and 29.
Rotor 40 so that the interval between
Is minimized, the capacitance is minimized.

FIG. 4 is a perspective view showing the adjusting member 44 from the lower end side, for explaining the second embodiment of the present invention. In this embodiment, the bottom surface of the ring-shaped groove 52 provided on the adjusting member 44 for positioning the O-ring 51 is provided with an uneven shape. Thereby, slippage between the O-ring 51 and the adjustment member 44 can be prevented, and therefore, rotation of the adjustment member 44 can be transmitted to the rotor 40 more reliably.

FIG. 5 is a view for explaining a third embodiment of the present invention.
FIG. In this embodiment, the adjusting member 44 is provided with a stopper 59 so as to protrude therefrom.
Is provided. The stopper 59 contacts the inner surface of the shield cover 54 as shown by the imaginary line, regardless of the direction in which the adjusting member 44 rotates, and regulates the rotatable range of the adjusting member 44 to an angle within 360 degrees. . Therefore, there is an advantage that the operation of adjusting the capacitance becomes easier. Although not shown, a special shape with which the stopper 59 abuts may be provided on the shield cover 54 side.

FIG. 6 is a plan view showing a rotor 40 for explaining a fourth embodiment of the present invention. In this embodiment, a notch 60 is provided in a peripheral portion of the rotor 40. The notch 60 engages with a shape portion such as a protrusion on the adjustment member 44 (not shown), and acts to secure the positioning between the rotor 40 and the adjustment member 44.

FIG. 7 is a view for explaining a fifth embodiment of the present invention, and shows a portion corresponding to the left part of FIG. In FIG. 7, the illustration of the first terminal 24 is omitted. This embodiment is different from the embodiment shown in FIGS. 1 to 3 in that a wall portion 61 of the shield cover 54 facing the upper main surface of the substrate 27 and an adjusting member 44 are provided.
Further, a coil spring 62 is provided as a pressing member having a spring property for urging the coil springs in a direction of separating them from each other. The coil spring 62 is disposed between the lower surface of the wall 61 and the step 47 of the adjustment member 44 so as to surround the adjustment member 44. The coil spring 62 is provided with the push nut 4 described above.
Like the spring washer 9 and the spring washer 50, it functions as contact maintaining means.

FIG. 8 is for explaining the sixth embodiment of the present invention, and is equivalent to FIG. In this embodiment, as compared with the above-described fifth embodiment, the push nut 49 and the spring washer 50 are not provided, and the contact maintaining means is constituted only by the coil spring 62. Further, the shaft portion 45 of the adjustment member 44 is shortened because it is not necessary to provide the push nut 49 and the spring washer 50, and does not project below the substrate 27. Also, the shield cover 54 does not extend to the lower main surface side of the substrate 27. In this regard, according to this embodiment, the size of the LC composite component can be further reduced.

FIG. 9 is for explaining the seventh embodiment of the present invention, and is a diagram corresponding to FIG. In this embodiment, as compared with the above-described sixth embodiment, the adjusting member 4
4 does not include the shaft portion 45, but instead has a concave portion 63 on the upper main surface of the substrate 27, in which the lower end of the adjusting member 44 is fitted, and the adjusting member 44 is By being held, it is held rotatably. Therefore, in this embodiment, the substrate 27 and the rotor 40 are not provided with the bearing holes 36 and 41.

FIG. 10 is for explaining the eighth embodiment of the present invention, and is equivalent to FIG. In this embodiment, as compared with the above-described sixth embodiment, the adjusting member 44 does not include the shaft portion 45, and instead, the shaft portion 64 is provided on the upper main surface of the substrate 27. The member 44 has a concave portion 65 for receiving the shaft portion 64. The shaft portion 64 is inserted into the bearing hole 41 of the rotor 40. Therefore, the adjustment member 44 is rotatably held by receiving the shaft portion 64 into the recess 65.

When the adjusting member 44 is obtained by molding, the coil spring 62 provided in the fifth to eighth embodiments shown in FIGS. 7 to 10, respectively, is inserted into its mold. , May be handled in a state of being integrated with the adjustment member 44.

FIGS. 11 and 12 illustrate a ninth embodiment of the present invention. FIG. 11 is a plan view showing a part of a shield cover 54, and FIG. 3 is a cross-sectional view showing a part of FIG. In this embodiment, a spring piece 66 formed with a part of the shield cover 54 is used instead of the coil spring 62 provided in the fifth to eighth embodiments shown in FIGS. 7 to 10 described above. It is characterized by:

More specifically, a plurality of spring pieces 66 are formed by cutting and raising the periphery of the opening 55 of the shield cover 54. The spring piece 66 is bent downward and elastically contacts the step 67 of the adjusting member 44 indicated by the imaginary line.
The step 67 is formed at a position above the step 47 described above. Like the coil spring 62, the spring piece 66 functions as a pressing member having a spring property to urge the wall portion 61 of the shield cover 54 and the adjustment member 44 in a direction to separate from each other.

FIGS. 13 and 14 show a tenth embodiment of the present invention.
For explaining the embodiment of the present invention.
FIG. 7 is a plan view showing a rotor 7 and a rotor 40. This embodiment differs from the embodiment shown in FIGS.
The shape of the second stator-side electrodes 68 and 69 and the shape of the rotor-side electrodes 70 are characteristic.

That is, the first and second stator electrodes 68 and 69 have, for example, a planar shape obtained by dividing a sector having a central angle of 180 degrees into an inner peripheral side and an outer peripheral side. On the other hand, the rotor-side electrode 70 has a substantially semicircular shape. A variable capacitor having electrodes having such shapes as the stator-side electrodes 68 and 69 and the rotor-side electrode 70 is described in, for example, Japanese Utility Model Laid-Open No. 58-133926.

In this embodiment, the first and second capacitances are respectively formed by the rotor-side electrode 70 facing the first and second stator-side electrodes 68 and 69 via the rotor 40. The first and second capacitances are connected in series by the rotor-side electrode 70. This capacitance is equivalent to the stator-side electrodes 68 and 6
When the electrode 9 and the rotor-side electrode 70 overlap, the maximum value is obtained, and when they do not overlap, the minimum value is obtained.

The central angles of the stator-side electrodes 68 and 69 and the rotor-side electrode 70 can be arbitrarily changed at an angle equal to or less than 180 degrees, whereby the adjustment angle can be arbitrarily changed. In addition, the area ratio between the first stator-side electrode 68 and the second stator-side electrode 69 can be arbitrarily changed.

In FIGS. 13 and 14, elements corresponding to the elements shown in FIG. 3 described above are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 13, projecting portions 71 and 72 are formed on the outer peripheral side of second stator-side electrode 69, and idle electrodes are formed on the side where stator-side electrodes 68 and 69 are not formed. 73 are formed. The overhanging portions 71 and 72 and the play electrode 73 act so as to prevent rattling in the rotation of the adjusting member 44 and the rotor 40 (not shown), and the adjusting member 4
Since the skirt portion 46 of 4 increases the electrode area in contact with the skirt portion 46, as a result, the lead electrodes 30 and 31 act to prevent disconnection.

[0071]

As described above, according to the variable capacitor and the LC composite component using the same according to the present invention, since the rotor made of the dielectric is used without using the air as the dielectric, the relative dielectric constant of the dielectric is used. , It is not necessary to increase the area of the rotor-side electrode and the stator-side electrode so much in order to obtain a desired amount of capacitance, and therefore, it is possible to reduce the influence of the surrounding stray capacitance. .

As described above, since the variable capacitor can be reduced in size, when an LC composite component is constructed, measures such as providing a window in the shield cover to avoid interference with the rotor side electrode or the rotor are taken. Not required. Therefore, the dustproof effect and the shield effect by the shield cover are not reduced.

Further, since the rotor and the rotor-side electrode are housed in the space on the inner peripheral side of the skirt portion of the adjusting member, there is no room for the disadvantage that the rotor-side electrode comes into contact with the shield cover and causes a loss of capacity. .

Further, the stator-side electrode formed on the substrate is divided into first and second stator-side electrodes, and the first and second stator-side electrodes are opposed to each other by the rotor-side electrode. 2 are formed, and the first and second capacitances are connected in series by the rotor-side electrode, so that the capacitance can be taken out from the first and second stator-side electrodes. it can.
Therefore, since it is not necessary to form an electrical conduction path for extracting the capacitance in the movable portion, the reliability of the variable capacitor or the LC composite component can be improved.

Further, the components constituting the variable capacitor or the LC composite component can be manufactured by a method capable of mass production, and the assembly of these components is easy, so that the cost can be reduced.

The adjusting member does not need to be conductive, and is preferably electrically insulated from the stator side electrode and the rotor side electrode because it is in an electrically insulated state. If the adjusting member is electrically insulating as described above, the restriction that the adjusting tool is electrically insulating is eliminated, and it is easy to improve the adjustment accuracy by rotating the adjusting member.

Further, since the rotor is pressed from the adjusting member toward the substrate via the rotation transmitting member made of an elastic body, even if the rotor is made of, for example, a ceramic dielectric, the adjusting member is not attached to the substrate. When mounting as desired, there is no inconvenience such as the rotor breaking, and when adjusting the capacitance, even if the adjustment member is tilted,
The state of close contact of the rotor with the substrate hardly fluctuates, and therefore, there is almost no change in capacitance due to the change in close contact state, so that the capacitance can be adjusted with high accuracy.

In the present invention, the adjusting member has a shaft portion serving as a rotation center thereof, and when the shaft portion passes through each bearing hole of the substrate and the rotor, the skirt portion is brought into contact with one main surface of the substrate. The contact maintaining means can be realized by a simple structure such as an engaging member that engages with the shaft portion on the other main surface side of the substrate to prevent the shaft portion from falling out of the bearing hole. At this time, if the contact maintaining means further includes a resilient member having a spring property that is arranged between the other main surface of the substrate and the engaging member and biases the engaging member in a direction to separate the engaging member from the substrate. Even if the position of the engaging member on the shaft portion is deviated, or if the engaging member or a portion that comes into contact with the engaging member is worn, the contact state of the skirt portion with the substrate is reliably maintained. In addition, a relatively large error in assembling accuracy can be tolerated.

Further, in the present invention, when the variable capacitor further includes a wall portion facing the one main surface of the substrate and having an opening for exposing the adjusting shape portion of the adjusting member, the contact maintaining means may include a wall. This can be provided by a pressing member having a spring property that biases the portion and the adjustment member in a direction to separate them from each other. Also in this case, the contact state of the skirt portion with the substrate can be reliably maintained, and a relatively large error can be allowed in assembling accuracy.

In the present invention, if the rotation transmitting means for transmitting the rotation of the adjusting member to the rotor is constituted by an O-ring, the rotation transmitting means can be realized with easily available parts. Further, when a ring-shaped groove for positioning the O-ring is formed on the adjusting member, not only can the O-ring be reliably positioned, but also the O-ring can be incorporated in the adjusting member in advance. Therefore, the efficiency of the assembly process of the variable capacitor or the LC composite component can be increased.

In the above-described embodiment, if the bottom surface of the groove provided in the adjusting member is provided with an uneven shape,
Sliding between the ring and the adjusting member can be prevented. Therefore, the rotation of the adjusting member can be more reliably transmitted to the rotor.

In the present invention, the first and second stator electrodes are connected to the one main surface of the substrate via the first and second lead electrodes, respectively, and come into contact with the skirt portion of the adjusting member. When the first and second terminal electrodes located outside the region are formed, the first and second extraction electrodes are made wider at a portion in contact with the skirt portion of the adjustment member than at other portions. And, while the adjusting member is rotated by contacting the skirt portion with the substrate, rattling of the adjusting member is prevented, and disconnection of the extraction electrode due to repeated sliding contact of the skirt portion can be suppressed,
Therefore, the life of the variable capacitor or the LC composite component can be extended.

[Brief description of the drawings]

FIG. 1 is a front view showing an LC composite component 21 according to a first embodiment of the present invention, in which a part of an adjustment member 44 and a shield cover 54 are shown in cross section.

FIG. 2 is a plan view showing the LC composite component 21 with the shield cover 54 shown in FIG. 1 removed.

FIG. 3 is an exploded perspective view showing components excluding a coil 23 shown in FIG. 2;

FIG. 4 is a perspective view for explaining a second embodiment of the present invention and showing an adjusting member 44 from a lower end side.

FIG. 5 is a plan view schematically illustrating an adjusting member 44 and a shield cover 54 for describing a third embodiment of the present invention.

FIG. 6 is a plan view illustrating a rotor 40 for explaining a fourth embodiment of the present invention.

FIG. 7 is a view for explaining a fifth embodiment of the present invention and is a diagram showing a portion corresponding to a left portion of FIG. 1;

FIG. 8 is for describing a sixth embodiment of the present invention, and is a diagram corresponding to FIG. 7;

FIG. 9 is for describing a seventh embodiment of the present invention, and is a diagram corresponding to FIG. 7;

FIG. 10 is a view for explaining an eighth embodiment of the present invention and is a view corresponding to FIG. 7;

FIG. 11 is a plan view illustrating a part of a shield cover 54 for describing a ninth embodiment of the present invention.

12 is a cross-sectional view showing the shield cover 54 shown in FIG. 11 from the front.

FIG. 13 is a plan view showing a substrate 27 for explaining a tenth embodiment of the present invention.

FIG. 14 is a plan view showing a rotor 40 used corresponding to the substrate 27 shown in FIG.

FIG. 15 is a front view showing the conventional LC composite component 1 of interest to the present invention, in which a part of the substrate 7 and a shield cover 18 are shown in a sectional view.

16 is a bottom view of the LC composite component 1 shown in FIG.

17 is a diagram showing an equivalent circuit provided by the LC composite component 1 shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 LC composite component 22 Variable capacitor 23 Coil 24 1st terminal 25 2nd terminal 26 3rd terminal 27 Substrate 28, 68 1st stator side electrode 29, 69 2nd stator side electrode 30 1st extraction electrode 30a, 31a Contacting part 31 Second extraction electrode 32 First terminal electrode 33 Second terminal electrode 34 Third terminal electrode 36, 41 Bearing hole 37, 38, 39 Through hole 40 Rotor 42, 43, 70 Rotor Side electrode 44 Adjusting member 45, 64 Shaft 46 Skirt 48 Adjusting groove 49 Push nut 50 Spring washer 51 O-ring 52 Ring-shaped groove 54 Shield cover 55 Opening 61 Wall 62 Coil spring 63, 65 Recess 66 Spring piece

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-102430 (JP, A) JP-A-10-233338 (JP, A) JP-A-2-4232 (JP, U) JP-A-58 173233 (JP, U) Shokai 58-95627 (JP, U) Shokai Hei 2-146404 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01G 5 / 06,5 /twenty four

Claims (8)

(57) [Claims] 1. An electrically insulating substrate having first and second stator-side electrodes formed on one main surface thereof at a distance from each other, and in contact with the first and second stator-side electrodes. And a rotor made of a dielectric material, which is held by the rotor and faces the first and second stator-side electrodes via at least a part of the rotor. And a space for accommodating the rotor, which connects the first and second capacitances in series, and a space for accommodating the rotor are formed on the inner peripheral side thereof, and the end face thereof is formed as described above. A skirt portion in contact with one main surface of the substrate is provided on one end side, and an adjustment shape portion capable of engaging with an adjustment tool is provided on the other end side. Of the axis perpendicular to An adjusting member, which is held so as to rotate around, and is electrically insulated from the first and second stator-side electrodes and the rotor-side electrode; On the other hand, contact maintaining means for maintaining a state of contact with the main surface, and disposed between the adjustment member and the rotor in the skirt portion, and presses the rotor toward one main surface of the substrate, wherein rotation of the adjustment member is transmitted to said rotor for rotating said rotor together with the adjusting member, and a rotation transmitting member made of an elastic body, on one main surface of the substrate, the first and second Stay
From the data-side electrode via the first and second extraction electrodes.
Respectively connected and in contact with the skirt of the adjusting member
Forming first and second terminal electrodes located outside the region
Is, the first and second lead electrodes, ska of the adjusting member
The part that comes in contact with the heat
It is is, a variable capacitor. 2. The adjustment member includes a shaft portion that provides the axis, the substrate and the rotor include a bearing hole that penetrates the shaft portion, and the contact maintaining unit includes a second main surface of the substrate. 2. The variable capacitor according to claim 1, further comprising: an engagement member that engages with the shaft portion on a side to prevent the shaft portion from coming out of the bearing hole. 3. 3. The contact maintaining means is disposed between the other main surface of the substrate and the engaging member, and has a spring property to urge the engaging member in a direction to separate the engaging member from the substrate. The variable capacitor according to claim 2, further comprising a light emitting member. 4. The apparatus according to claim 1, further comprising: a wall portion having an opening facing the one main surface of the substrate and exposing the adjustment shape portion of the adjustment member, wherein the contact maintaining means includes: 2. The variable capacitor according to claim 1, further comprising: a pressing member having a spring property for urging the pressing members in a direction of separating them from each other. 5. The variable capacitor according to claim 1, wherein the rotation transmitting means includes an O-ring, and the adjusting member has a ring-shaped groove for positioning the O-ring. 6. The variable capacitor according to claim 5, wherein an uneven shape is provided on a bottom surface of the groove. 7. On one of the main surfaces, the first main surface is spaced apart from each other.
Electrical insulation with first and second stator electrodes formed
Substrate and So as to contact the first and second stator electrodes.
A rotor made of a dielectric material, The first and second switches held by the rotor;
Through at least a part of the rotor with respect to the data-side electrode.
And the first and second capacitances
And the first and second static
A rotor-side electrode for connecting the capacitance in series, A space for accommodating the rotor is formed on an inner peripheral side thereof.
A skirt whose end face contacts one principal surface of the substrate
Part at one end and the other end
Having an adjustment shape portion that can be combined,
To rotate about an axis perpendicular to the major surface
Held, and the first and second stator-side electrodes
And the rotor side electrode is in an electrically insulated state.
An adjusting member; The skirt portion of the adjusting member is arranged on one main surface of the substrate.
Keep in contact Contact maintaining means for The adjusting member and the rotor in the skirt portion;
And the rotor faces one main surface of the substrate.
Press, and rotate the adjustment member
To rotate the rotor together with the adjustment member.
A rotation transmitting member made of an elastic body, The adjustment of the adjustment member is opposed to one main surface of the substrate.
Wall portion having an opening for exposing the trimming shape portion, The contact maintaining means holds the wall and the adjustment member together.
A pressing member having a spring property for urging in a direction to separate the
Provided, variable capacitor. 8. A first and a second stator-side electrode are formed on one main surface at an interval from each other,
First and second terminal electrodes connected to the first and second stator-side electrodes via first and second extraction electrodes, respectively, and independently of the first and second terminal electrodes. An electrical insulating substrate on which the third terminal electrodes are respectively formed; a rotor made of a dielectric material arranged to be in contact with the first and second stator-side electrodes; First and second capacitances are respectively formed by facing the first and second stator-side electrodes via at least a part of the rotor, and the first and second capacitances are formed. A rotor-side electrode and a space for accommodating the rotor are formed on the inner peripheral side, and a skirt portion whose one end surface is in contact with one main surface of the substrate is provided on one end side; The other end has an adjustment shape portion that can be engaged with the adjustment tool, is held so as to rotate around an axis orthogonal to one main surface of the substrate, and further has the first shape. An adjustment member electrically insulated from the second stator-side electrode and the rotor-side electrode; and a contact for maintaining the skirt portion of the adjustment member in contact with one main surface of the substrate. Maintaining means, disposed between the adjusting member and the rotor within the skirt portion, and pressing the rotor toward one main surface of the substrate, transmitting rotation of the adjusting member to the rotor, A rotation transmitting member made of an elastic body for rotating the rotor together with the adjusting member; an inductor connected between the second and third terminal electrodes; and the adjusting shape portion of the adjusting member And having an opening to expose the, and a shield cover attached to said substrate so as to accommodate the adjusting member and the inductor, LC composite component.