JP2552678Y2 - Variable resonance device - 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 resonance device in which a trimmer capacitor and a coil are connected, and more particularly to an RF modulator circuit or a TV tuner circuit which inputs a video signal and an audio signal and outputs a general composite television signal. The present invention relates to a high-frequency variable resonance device that changes an oscillation frequency.

[0002]

2. Description of the Related Art Conventionally, as a variable resonance device used in this type of RF modulator circuit or television tuner circuit, for example, a rotor having a stator electrode plate is rotatably supported on a rotor shaft, and the rotor shaft is mounted on the rotor shaft. A trimmer capacitor provided with an electrode plate, and a coil forming a resonance circuit between the trimmer capacitor and the coil are arranged on a small printed circuit board to form a circuit, connection terminals are derived from the printed circuit board, and the trimmer capacitors and It had a configuration in which a shield case was placed on a printed circuit board so as to cover the coil. Then, by rotating the rotor shaft of the trimmer capacitor, the position of the rotor electrode plate with respect to the stator electrode plate is varied to finely adjust the resonance frequency.

[0003]

However, in the variable resonance device having the above-described structure, the independently assembled trimmer capacitor is mounted on the printed circuit board, and the trimmer capacitor is connected to the coil via the circuit pattern on the printed circuit board. Since a resonance circuit is formed, there is a limit in reducing the overall size. In recent years, further reduction in the size of electronic devices has been desired, and therefore, a device has been required from the viewpoint of reducing the size of the variable resonance device. Also, the frequency handled in the modulator circuit or TV tuner circuit used by the variable resonance device is high frequency or super high frequency, and the resonance frequency changes due to slight deformation or displacement of the coil. It is necessary to fix it by coating it, etc., which complicates production.

Further, when the variable resonator is connected in parallel to an external circuit, one end of the trimmer capacitor cannot be grounded as compared with the non-parallel type, so that special arrangement is required for the configuration of the trimmer capacitor. The present invention has been made in order to solve such a conventional drawback, and provides a variable resonance device that can be further miniaturized, suppresses variation in resonance frequency, and can be used in various connection states. With the goal.

[0005]

In order to solve such a problem, the present invention is to fix a relay terminal through an insulating substrate and to have a rotor electrode plate rotatable on the insulating substrate from one side thereof. And a stator electrode plate fitted on the relay terminal and supported on one side of the rotor .
A trimmer capacitor is formed from the stator , the lead-out piece is led out from the rotor electrode plate to the opposite surface side, and one end of the lead wire of a coil formed by winding a lead wire is connected to the relay terminal on one side thereof and the stator is formed. The conductor is connected to the electrode plate, and the other end of the conductive wire penetrates the insulating substrate and protrudes toward the facing surface. In the present invention, it is preferable to dispose the coil on the outer surface of a bobbin protruding from the insulating substrate on one side, or to form the bobbin by forming an annular groove on one side of the insulating substrate.

[0006]

In the present invention provided with such means, the trimmer capacitor is formed by supporting the stator electrode plate on the relay terminal fixed to the insulating substrate and supporting the rotor electrode plate on the insulating substrate. If the other end of the conductor forming the wire is supported by the insulating substrate and one end of the conductor is connected to the relay terminal, the trimmer capacitor and the coil are integrally fixed by the insulating substrate, and the resonance circuit has a short circuit configuration. It is formed, and the coil is also supported by the relay terminal and the insulating substrate. And in the structure which arrange | positions the said coil on the bobbin outer periphery of an insulating substrate, a coil is positioned correctly. Further, in a configuration in which a bobbin is formed by forming an annular groove on one side of the insulating substrate, the coil is positioned only by fitting the coil into the annular groove.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are cross-sectional views showing one embodiment of the variable resonance device according to the present invention (FIG. 2 is a cross section taken along line II-II in FIG. 1). In addition, it shows in the state seen from some fronts. 1 and 2, a trimmer capacitor 3 and a coil 5 are attached to an insulating substrate 1 formed by molding steatite, alumina porcelain, or the like, and the coil 5 is mounted on one side (upper side in the drawing) of the insulating substrate 1. Of the trimmer capacitor 3
It is connected to the. The insulating substrate 1 is, as shown in FIG.
It has a relatively flat block shape, and a half in the longitudinal direction is thicker than the other. Concave portions 7 and 9 are formed on the lower surface side in a thick portion, and the through holes 11 and 13 is formed in the insulating substrate 1, and a support hole 15 through which the other end 5b of the coil 5 is inserted is formed in a thin portion.
Are formed through.

In the insulating substrate 1, a U-shaped lead piece 17 penetrates from the upper surface side in the vicinity of the through hole 13 and hangs from the recess 9. A through-hole 17a is formed in the middle piece of the lead-out piece 17, and the rotor shaft 19 penetrates through the through-hole 17a and hangs down from the concave portion 9, and two washers 21a having different diameters in the concave portion 9 are provided. , 21b are fitted and their tips are expanded and deformed, and the rotor shaft 19 is
And is rotatably supported by
Are electrically connected. The rotor shaft 19 is formed integrally with a semi-circular rotor electrode plate 23 at a small interval, and has an engagement protrusion 2 of an adjustment knob 25 to be described later at an upper end.
An engagement groove 19a engaging with 5a is formed, and a rotor 27 is formed.

A relay terminal 31 is inserted through the spacer 29 from the upper surface side of the insulating substrate 1 and is inserted into the through hole 11 and is fixed. In the relay terminal 31,
As shown in FIG. 4, a plurality of stator electrode plates 33 and spacers 35 are alternately fitted and fixed on the upper surface side of the insulating substrate 1 to form a stator 37. The stator electrode plate 33 has a tip extending to the center of the rotor shaft 19 and is cut into a semicircle slightly larger than the outer shape of the rotor shaft 19.
By setting the same interval as the gap and appropriately setting the thickness of the spacer 29, even when the stator electrode plate 33 and the rotor electrode plate 23 are overlapped, they face each other with a gap therebetween, and the trimmer capacitor 3 is formed. (Figure 5
reference).

The coil 5 is formed by winding one to several turns of a conducting wire around the outer periphery of a cylindrical bobbin 39 integrally projecting upward from a thin portion of the insulating substrate 1. The upper end is soldered to the end of the relay terminal 31 or the stator electrode plate 33, and the other end 5 b is connected to the bobbin 39.
Penetrates through the support hole 15 formed at the base of the base member. However, the coil 5 is assembled by winding a conductive wire in advance and positioning the other end 5b on the outer periphery of the bobbin 39 so as to pass through the support hole 15, and connecting one end 5a to the relay board 31.

An upper portion of the rotor shaft 19 is engaged with an insulating adjusting knob 25. The adjusting knob 25 has a cup shape, and has a front end engaging groove 19a of the rotor shaft 19 on an inner upper surface.
Is formed, while the upper end portion has a slightly smaller diameter, and an engagement groove 25b for engagement with an adjustment driver or the like is formed on the end surface. As shown in FIG. 5, for example, the shield case 41 is formed by bending a tin plate into a box shape, and is fixed to the insulating substrate 1 so as to cover the trimmer capacitor 3, the coil 5, and the adjustment knob 25. The upper end of the adjustment knob 25 is fitted into the fitting hole 41a formed on the upper surface and protrudes. Reference numeral 41b denotes a connection piece that hangs from the open lower end of the shield case 41.

In such a variable resonance device, the lead piece 1
7, an adjustment knob 25 that is used by connecting the relay terminal 31, the other end 5b of the coil 5, and the connection piece 41b of the shield case 41 to a circuit board of, for example, an RF modulator circuit or a TV tuner circuit, and protrudes from the shield case 41.
When the tip of the adjusting screwdriver is engaged with the engaging groove 25b and rotated, the rotor 27 of the trimmer capacitor 3 is rotated via the adjusting knob 25, and the capacity of the trimmer capacitor 3 can be finely adjusted. In FIG. 1, a two-dot chain line of the trimmer capacitor 3 is an imaginary view showing a state where the rotor electrode plate 23 is rotated (the same applies hereinafter).

In the variable resonance device having such a configuration, the rotor shaft 19 having the rotor electrode plate 23 and supported on the insulating substrate 1 from the upper surface side thereof, and the relay terminal 31 penetrated and fixed to the insulating substrate 1 have one surface thereof. The trimmer capacitor 3 is formed by the stator electrode plate 33 supported on the side, and the lead piece 17 and the relay terminal 31 from the rotor shaft 19 are protruded to the lower surface side of the insulating substrate 1, and one end 5a of the coil 5 is connected to the upper surface side. The trimmer capacitor is connected to the relay terminal 31 and the other end 5b is supported on the insulating substrate 1 and protrudes downward, so that the rotor shaft 19 is supported on the insulating substrate 1 and the relay terminal 31 supports the stator electrode plate 33. Is formed, and
By simply connecting one end 5a of the coil 5 to the relay terminal 31, a resonance circuit can be formed with a short circuit configuration.

Therefore, the overall shape can be further reduced in size, and the coil 5 formed by winding the conductive wire is supported by the relay terminal 31, the bobbin 39 and the insulating substrate 1, so that the coil 5 is deformed or displaced. Oscillation frequency stabilizes due to difficulty. In addition, since it is not necessary to apply an adhesive or the like to suppress deformation and displacement of the coil 5, manufacturing is simplified. Furthermore, since the lead-out piece 17, the relay terminal 31, and the other end 5b of the coil 5 from the rotor shaft 19 are led out independently, parallel and non-parallel types can be connected to an external circuit, and the range of use is expanded. Is done.

FIGS. 6 and 7 are sectional views showing another embodiment of the variable resonance device of the present invention. That is, in the variable resonator shown in FIG. 6, the bobbin 39 is formed by forming the annular groove 43 on the upper surface side of the insulating substrate 1 having a constant thickness.
The coil 5 is arranged on the outer periphery of the bobbin 39 such that the coil 5 is fitted in the annular groove 43. Thus, the annular groove 4
Since the coil 5 can be positioned only by fitting the coil 5 into the coil 3 and the coil 5 is housed in the annular groove 43, it is difficult for other parts to come into contact with the coil 5 in the assembly process, and the coil 5 is damaged. No dripping or change in characteristics. Also,
The variable resonance device shown in FIG.
5 into the through hole 47 of the insulating substrate 1, and the bobbin 4
5 has a configuration in which a coil 5 is arranged on the outer periphery.

In this configuration, since the bobbin 45 can be formed of a ferromagnetic material different from the insulating substrate 1, the Q of the coil 5 can be improved. In the embodiment described above, the relay terminal 31 is connected to the trimmer capacitor 3 and the coil 5.
However, in the present invention, the arrangement position of the relay terminal 31 is not limited to this. Also for the trimmer capacitor 3, the number of the rotor electrode plates 23 and the number of the stator electrode plates 37 can be arbitrarily selected according to the target resonance frequency.

[0017]

In the present invention as it has been described above devised], the rotor conductive
Supports rotor and stator electrode plates with pole plates on relay terminals
Trimmer capacitor comprising a stator formed by
The coil wound with the conductor and the conductor are integrated on the insulating substrate and the trimmer capacitor and the coil are connected by the relay terminal fixed to the insulating substrate. The wound coil is supported by the relay terminal and the insulating substrate,
There is an advantage that the coil is hardly deformed or displaced, so that the variation in the resonance frequency can be suppressed, and the use can be expanded in accordance with various connection states. In the configuration in which the coil is arranged on the outer periphery of the bobbin of the insulating substrate, the coil is accurately positioned, so that the resonance frequency is further stabilized. Further, in a configuration in which an annular groove is formed on one surface side of the insulating substrate to form a bobbin, the coil is positioned only by inserting the coil into the annular groove, and the coil is housed in the annular groove 43. It becomes difficult for other parts to come into contact with the coil, and the coil is not damaged or its characteristics are not changed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a variable resonance device according to the present invention.

FIG. 2 is a sectional view taken along line II-II in the variable resonance device of FIG.

FIG. 3 is a partially exploded perspective view of the variable resonance device of FIG.

FIG. 4 is a partially exploded perspective view of the variable resonance device of FIG. 1;

FIG. 5 is a partially exploded perspective view of the variable resonance device of FIG. 1;

FIG. 6 is a cross-sectional view showing another embodiment of the variable resonance device according to the present invention.

FIG. 7 is a sectional view showing another embodiment of the variable resonance device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulating board 3 Trimmer capacitor 5 Coil 5a One end 5b The other end 7, 9 Concave part 11, 13 Through hole 15 Support hole 17 Outgoing piece 19 Rotor shaft 19a, 25b Engagement groove 21a, 21b Washer 23 Rotor electrode plate 25 Adjusting knob 25a Collar piece 27 Rotor 29, 35 Spacer 31 Relay terminal 33 Stator electrode plate 37 Stator 39, 45 Bobbin 41 Shield case 41a Fitting hole 41a Connection piece 43 Ring groove

Claims (1)

(57) [Scope of request for utility model registration] And 1. A insulating substrate, and the insulating relay terminal board is fixed through, a rotor rotatably supported from the one side to the insulating substrate has a rotor electrode plate, wherein one side The stator electrode plate is fitted into the relay terminal at
And a coil formed by winding a conductive wire, wherein one end of the conductive wire is formed on the one surface side. A coil connected to the relay terminal , connected to the stator electrode plate, and having the other end of the conductor penetrating through the insulating substrate and protruding toward the facing surface. Equipment .