JPH073630Y2 - Variable capacitor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a variable capacitor used in a tuning circuit of a consumer receiver or the like.

[Conventional technology]

As a variable capacitor of this type, a relatively small-sized polyvaricon (registered trademark) or the like is known.

In the variable capacitor, a rotor group is arranged on a rotating shaft, and a stator group in which a rotor group and an insulating film are laminated is further arranged on a substrate. And relatively small capacity 5PF
A push plate on which a plurality of trimmer capacitors and the like are arranged is rotatably supported by the rotary shaft and the like to form a variable capacitance section. After that, in order to prevent dust from entering, a cover is attached except the substrate.

[Problems to be solved by the device]

However, the variable capacitor described above requires a separate cover for preventing the entry of dust, and the cover is provided with a through hole for adjusting the trimmer capacitor. As a result, there are drawbacks such as poor hermeticity, difficulty in automating the mounting of the cover, etc., which leads to high costs.

The present invention has been made in view of the above point, and an object of the present invention is to provide a variable capacitor that has good sealing property and operation stability, and that the mounting of the sealing tape is automated, so that the cost can be reduced. To do.

[Means for Solving the Problems]

A variable capacitor according to the present invention includes a substrate, a pressing plate that faces the substrate and has at least a rotor group and a stator group disposed between the substrate, and a winding plate around the substrate and the pressing plate. And an adhesive tape that seals between the substrate and the pressing plate.

[Action]

In the variable capacitor configured as described above, the hermeticity is improved, and the sealing tape is automatically attached by the automatic machine. Further, the sealing tape and the stator group are adhered to reduce unnecessary vibration, and for example, howling in a receiver used is effectively prevented.

〔Example〕

Hereinafter, embodiments of a variable capacitor according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an overall configuration diagram of the embodiment, and FIG. 2 shows the trimmer capacitor section in detail by diffusion decomposition. Further, FIG. 3 shows a mounting state of the adhesive tape, and FIG. 4 shows a cross section taken along the line AA in FIG.

In the embodiment shown in FIG. 1, a variable capacitance section V used for a tuning circuit such as RF / OSC and a trimmer capacitor section T used for each fine adjustment are roughly configured.

First, the variable capacitance section V (see FIG. 1) will be described. In the figure,
Reference numeral 2 denotes a substrate, on which a rotating shaft 3 which is rotatably attached, and metal columns 4a, 4b, 4c and 4d are arranged. Reference numerals 5a, 5b (not shown), 5c, 5d are soldered terminals connected to the metal columns 4a to 4d and connected to a circuit board or the like.

Next, the stator groups 6a, 6b, 6c and 6d laminated with the polyester film of the insulating member sandwiched between the metal plates are the metal columns.
Rotor groups 7a, 7b, 7c, 7d which are press-fitted into 4a to 4d and which fit into the stator groups 6a to 6d and rotate are fixed to the rotating shaft 3. Here, a part of the stator groups 6a to 6d is locked to the insulating columns 8a, 8b, 8c, 8d as shown in the figure, and the stable state of the arrangement is maintained. Reference numerals 10 and 11 are a nut and a reinforcing plate for fixing the rotor groups 7a to 7d to the rotating shaft 3.

Next, the trimmer condenser section T is composed of the push plate 13 and the trimmer cover.
Trimmer capacitors 15, 16, 17, 18, and 19 are formed between the trimmer capacitors 14 and 14. Reference numeral 20 is a ground plate, 21 and 22 are stator hot terminals, and 23a, 23b, 23c and 23d are nuts that are screwed to the metal columns 4a to 4d, and fasten between the substrate 2 and the trimmer cover 14.

Next, the trimmer capacitor unit T will be described in detail with reference to FIG.

Each protrusion 13c, 13d, 13e, 13f, 13g, 13h, 13i, 1 of the push plate 13
The through holes of the stator plates 14a, 14b, 14c, 14d are fitted and mounted on the 3j. Then, a polyester film 25, which is an insulating member, is disposed so as to be inscribed in the protrusions 13c to 13j. Then, the rotor parts 26, 27, 28, 29 are covered with the shafts 26a, 27a, 28.
The a and 29a are fitted and mounted in the insertion holes of the push plate 13, and the ground plate 20 is placed thereon. After this, the trimmer cover 14 is locked. Reference numerals 20a and 20b related to the ground plate 20 are tongue pieces for connecting lead wires.

Here, when the variable capacitance part V and the trimmer capacitor part T are fitted together, as shown in FIG. 3, an adhesive tape Pt is provided between the substrate 2 and the pressing plate 13 in order to prevent dust and the like from entering. Is wound by an automatic machine. In this case, as shown in FIG. 4, the board 2 and the pressing plate 13 are fitted into the step portions 2a and 13a and wound, and the inner surface of the adhesive tape Pt and the stator groups 6a to 6d are brought into contact with each other. To be glued.

The adhesive tape Pt is wound while being guided by the step portions 2a and 13a, does not project from the substrate 2 and the pressing plate 13, and is prevented from peeling due to contact with other members or the like.

Thereafter, the ground plate 20 and the stator hot terminals 21 and 22 are curved in the direction of the board 2, and the hole 20c and the notch projections 21a and 22a are formed on the board 2 respectively.
It is locked to c, 2d and 2e.

In this way, the winding of the adhesive tape Pt is wound in automation, and the manufacturing labor is reduced. Further, the stator groups 6a to 6d
Is partly adhered and fixed to the adhesive tape Pt, whereby vibration is reduced, and howling is reduced when the variable capacitor according to the embodiment is adopted in a receiver or the like.

[Effect of device]

As described above, in the variable capacitor according to the present invention, the substrate, the pressing plate that faces the substrate, and at least the rotor group and the stator group are disposed between the substrate, and the substrate and the pressing plate. And a pressure-sensitive adhesive tape that seals the space between the substrate and the pressing plate, and has a good sealing property and operational stability, and the mounting of the sealing tape is automated. Therefore, there is an effect that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of a variable capacitor of the present invention, FIG. 2 is a diffusion exploded view showing details of a trimmer capacitor section in the embodiment of FIG. 1, and FIG. 3 is an embodiment of FIG. FIG. 4 is an external view showing the mounted state of the adhesive tape in FIG. 4, and FIG. 4 is a sectional view taken along the line AA in FIG. 2 ... Substrate, 13 ... Push plate, Pt ... Adhesive tape.

Claims (1)

[Scope of utility model registration request] 1. A substrate, a pressing plate that faces the substrate, and at least a rotor group and a stator group are disposed between the substrate and the pressing plate, and is wound around a periphery between the substrate and the pressing plate, A variable capacitor, comprising: an adhesive tape that seals between the substrate and the pressing plate.