JPS6028118Y2 - Fixed electrode block of variable capacitor - Google Patents

Description

[Detailed description of the invention] The present invention relates to a fixed electrode block for a variable capacitor, and in particular provides a fixed electrode block with little variation in variable capacitance characteristics, constant high quality, and good productivity. This is what I am trying to do.

Generally, the fixed electrode block of a conventional variable capacitor is
As shown in the figure, the engagement protrusion 1a of the fixed electrode 1 is covered with a dielectric film 1b with the engagement protrusion 1a exposed.
The fixing piece 2 is fitted into the hole 2a of the fixing piece 2 made of an elastic metal plate, and the fixing piece 2 is inserted into the dielectric film 1 on the fixed electrode 1.
A fixed electrode block was configured by being brought into elastic contact with the outer peripheral edge of b.

However, in general, a clearance (fitting margin) is provided between the engagement protrusion 1a of the fixed electrode 1 and the hole 2a of the fixed piece 2 to facilitate fitting. Depending on the shape of the outer periphery of the dielectric film 1b that comes into contact with the piece 2, or the inclination of the fixed electrode 1 with respect to the fixed piece 2 during assembly, the fixed electrode 1 may be aligned with the hole 2a as a reference as shown in FIG. A plurality of fixed electrodes 1 can be assembled and fixed on a fixed piece 2, even if they are tilted to the left or right, or even if they are perpendicular to the hole 2a, they are scattered to the left or right. Since the electrode block is configured, when a variable capacitor is manufactured by combining such a fixed electrode block with the movable electrode 4 attached to the shaft 3 as shown in FIG. 1's opposing state varies, variable capacitance characteristics vary from product to product, and products of constant quality cannot be obtained.
For this reason, after manufacturing the fixed electrode block, it is necessary to adjust the gap between the fixed electrodes 1, resulting in poor productivity.Furthermore, even if a variable capacitor is completed using this after adjusting the gap, vibrations may occur during assembly, etc. There is a drawback that the fixed electrode 1 may shift due to impact or the like, resulting in inconsistent quality.

The present invention solves the various drawbacks of the conventional structure as described above. To explain the embodiments shown in FIGS. 4 to 8, the fixing piece 2 having the hole 2a is The dielectric film 1b made of polyethylene or the like and coated on the fixed electrode 1 forms a bendable protrusion 1b' from one edge of the fixed electrode 1 on the side that comes into elastic contact with the fixed piece 2. ing.

Then, the engagement protrusions 1a of the plurality of fixed electrodes 1 are connected to the fixed piece 2.
When the fixed electrode block is constructed by fitting into the hole 2a of the dielectric film 1 on each fixed electrode 1, as shown in FIG.
The protrusion 1b' of b is in elastic contact with the fixing piece 2 while being slightly bent in the same direction.

That is, the dielectric film 1b made of polyethylene or the like is itself flexible and has some springiness, so the fixed electrode 1 can be moved in the X and Y directions by the bent protrusion 1b'. As a result, all of the engaging protrusions 1a, which are constantly pressed and fitted into the hole 2a with a clearance as shown in FIG.
The lower part is biased to the right side of the hole 2a, and all the fixed electrodes 1 are tilted to the same side within the clearance range.

In addition, to make a fixed electrode block, for example, as shown in FIG. 7, first insert the fixed electrode 1 into the groove 6 of the jig 5,
The protrusion 1b' of the dielectric film 1b is made to protrude outward from the groove 6, and then the jig 7 is moved in the direction of the arrow while the protrusion 1b' is held down by the jig 7.

Then, the protrusions 1b' on each fixed electrode 1 are slightly bent toward the same side, and in this state, the fixed piece 2 is attached to the protrusion 1.
b', and while pressing the protrusion 1b' with the fixing piece 2, the hole 2a of the fixing piece 2 is fitted into the engagement protrusion 1a of the fixed electrode 1, thereby completing the fixed electrode block.

The fixed electrode block assembled in this way has the fixed electrode 1 tilted in the same direction as shown in FIG. 6, and when combined with the movable electrode 4 to manufacture a variable capacitor, As shown in the figure, the gap between each fixed electrode 1 and the movable electrode 4 can be kept constant at all times.

That is, according to the present invention, each of the plurality of fixed electrodes 1
Since the protruding portion 1b' of the dielectric film 1b covered with the dielectric film 1b is bent along the same axis and brought into elastic contact with the fixed piece 2, all the fixed electrodes 1 are attached to the fixed piece 2 in the same state. Therefore, there is little variation in variable capacitance characteristics across all fixed electrode blocks, and high quality can be obtained.
Also, in the process of manufacturing a variable capacitor using this fixed electrode block, even if external forces such as vibrations and shocks are applied to the fixed electrode block, the protrusion 1b' bent to the same side will not be subjected to pressure on the fixed piece 2. Therefore, the position of the retaining protrusion 1a relative to the hole 2a does not change in any way and can always be kept constant. Therefore, even after manufacturing the variable capacitor, a constant high quality can be obtained, and there is no need to adjust the gap. This has the effect that products with good productivity can be obtained.

[Brief explanation of the drawing]

1 to 3 are related to the conventional art; FIG. 1 is a cross-sectional side view of the main part of the fixed electrode block, FIG. 2 is a front view of the same, and FIG.
The figure is a sectional view of essential parts of a variable capacitor, Figures 4 to 8 are related to the present invention, Figure 4 is an exploded perspective view of a fixed electrode block,
Figure 5 is a cross-sectional side view of the main parts of the assembly, Figure 6 is a front view of the same,
FIG. 7 is an explanatory diagram showing the same assembly method, and FIG. 8 is a sectional view of the main part of the variable capacitor. 1... Fixed electrode, 1a... Engaging protrusion,
1b...Dielectric film, 1b'...
Projection part, 2... Fixed piece, 2a... Hole,
3...Axis, 4...Movable electrode, 5...
...Jig, 6...Groove, 7...Jig.

Claims (1)

[Scope of utility model registration request] a plurality of fixed electrodes covered with an elastic dielectric film having a protrusion capable of bending the retaining protrusion, and a fixed piece made of an elastic metal plate having a hole into which the engaging protrusion is fitted; A fixed electrode of a variable capacitor, comprising: an engaging protrusion of the fixed electrode fitted into a hole of the fixed piece, and a protrusion of a dielectric film bent to the same side and brought into elastic contact with the fixed piece. Hanging.