JPH04127634U - variable capacitor - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to reduce as much as possible the occurrence of so-called howling, which occurs when the stator plate and rotor plate vibrate due to external vibrations, etc. in a variable capacitor. [Configuration] The stator plate 1 and the rotor plate 2 are connected to the rotor shaft 3.
The variable capacitors are arranged alternately in the axial direction, and an insulating film 6 is attached to the surface of the stator plate, and the rotor plate 2 is slidably contacted with the film 6. It is characterized in that the attached insulating film 6 is provided extending at least to a position surrounding the rotor shaft 3.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a variable capacitor, especially a variable capacitor with an insulating film attached to the surface of the stator plate. Regarding variable capacitors.

0002

[Conventional technology]

In general, variable capacitors are made up of multiple stages, as shown in Figures 4 and 5, for example. The rotor plates 1 and 2 are arranged alternately in the axial direction of the rotor shaft 3. The rotor plate 2 is rotated into the space between adjacent stator plates 1 and 1. be. As shown in FIG. 5, the stator plate 1 is arranged at regular intervals in the vertical direction. The rotor plate 2 is placed and fixed on the rotor support 4, etc., and the rotor plate 2 is fitted to the rotor shaft 3 with a rotation lock. Both are held at a constant interval by washers 5 and the like. Then, on both sides of the stator plate 1, a polyethylene film or the like is applied as a dielectric material. Attach (laminate) an insulating film 6 and slide the rotor plate 2 onto the film 6. By making the contact possible, stator plate 1 and rotor plate 2 will be protected from external vibrations, etc. There is a known device that prevents the occurrence of so-called howling due to vibration. ing.

0003

[Problem that the idea aims to solve]

However, in the conventional method, the insulating film 6 is almost the same as the plate surface of the stator plate 1. Generally, it is formed to be very slightly large, and at the minimum capacity, as shown in Fig. As shown in the figure, there is very little overlap with the rotor plate 2, that is, there is very little contact. In order to prevent the stator plate 1 and rotor plate 2 from vibrating due to external vibrations, etc. There were problems such as not being able to prevent the problem in minutes. The present invention aims to solve the above problems with a simple configuration.

0004

[Means to solve the problem]

In order to achieve the above purpose, the variable capacitor according to the present invention has the following configuration. This is what I did. That is, stator plates and rotor plates are arranged alternately in the axial direction of the rotor shaft, and the stator plates and rotor plates are arranged alternately in the axial direction of the rotor shaft. Attach an insulating film to the surface of the rotor plate, and attach the rotor plate to the film. In variable capacitors that are in slidable contact, the stator plate is attached to the stator plate. Extend the attached insulating film at least as far as to surround the rotor shaft. It is characterized by having been provided with

[0005]

[Effect]

As mentioned above, the insulating film attached to the stator plate should be attached to at least the rotor shaft. By extending it to a position that surrounds the The theta plate and rotor plate are in contact with each other over a relatively wide area via the insulating film, and the outside To reduce vibrations of the stator plate and rotor plate as much as possible due to vibrations from the parts. becomes possible.

[0006]

【Example】

Hereinafter, the present invention will be specifically explained based on the embodiments shown in the drawings. Figure 1 is based on the present invention. FIG. 2 is a cross section taken along the line A-A in FIG. 1. 3 are plan views of other embodiments, which are similar to the conventional examples shown in FIGS. 4 and 5. The same reference numerals are used to describe the members having the same function.

[0007] The embodiment shown in FIGS. 1 and 2 has an insulating film 6 attached to both sides of the stator plate 1. is extended and protruded to a position surrounding the rotor shaft 3, and the extended protrusion 6a is It is designed to overlap a part of the rotor plate 2. 6b is formed on the film 6 above. The rotor shaft insertion hole is shown. As described above, extend the insulating film 6 to the position surrounding the rotor shaft 3. By letting the insulating film 6 come out, even at the minimum capacity, the insulating film 6 remains on the rotor shaft 3. The stator is in contact with a part of the rotor plate 2 near the stator plate including the surrounding area over a relatively wide area. This can more reliably prevent the rotor plate 1 and the rotor plate 2 from vibrating.

[0008] Note that the extension protrusion 6a of the film 6 from the stator plate 1 is located at each stage in the figure. The structure is such that the films attached to both sides of the data plate are brought into direct contact with each other. An insulating film or the like having approximately the same thickness as the stator plate 1 is interposed between the two films. You may do so. Further, in the above embodiment, the extension protruding portion 6a from the stator plate 1 is However, as shown in Figure 3, at the minimum capacity, the It may be made to overlap substantially the entire surface of the rotor plate.

[0009]

[Effect of the idea]

As explained above, the variable capacitor according to the present invention is provided on the surface of the stator plate 1. At least extend the attached insulating film 6 to a position surrounding the rotor shaft 3. Since the extension is provided, stator plate 1 and rotor plate 2 can maintain the above-mentioned position even at the minimum capacity. Contact is made on a relatively wide surface via the insulating film 6, and the stator is Vibration of the plate 1 and the rotor plate 2 is prevented more reliably than the conventional one. This makes it possible to reduce the occurrence of howling as much as possible.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a variable capacitor according to the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1.

FIG. 3 is a plan view of another embodiment.

FIG. 4 is a plan view of a conventional variable capacitor.

FIG. 5 is a sectional view taken along line A-A in FIG. 4;

[Explanation of symbols]

1 Stator plate 2 Rotor plate 3 Rotor shaft 4 Stator strut 5 Washer 6 Insulating film 6a Extension protrusion

Claims (1)

[Scope of utility model registration request] Claim 1: A stator plate and a rotor plate are arranged alternately in the axial direction of the rotor shaft, an insulating film is attached to the surface of the stator plate, and the rotor plate is brought into slidable contact with the film. A variable capacitor according to the present invention, characterized in that the insulating film attached to the stator plate extends at least to a position surrounding the rotor shaft.