JPS6031245Y2 - trimmer capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention particularly relates to a trimmer capacitor used in thin devices such as electronic watches.

Trimmer capacitors, which have been widely known, are made by stacking two similar ceramic discs, supporting them both with a shaft, rotating one disc with a driver, and changing the overlapping area of the discs to increase the capacitance. It was designed to change the

However, according to the conventional trimmer capacitor described above, the dimension in the thickness direction is large, and it is difficult to reduce the thickness, especially when used in an electronic watch.

The present invention aims to eliminate the above-mentioned drawbacks and provide a thin trimmer capacitor.

The gist of this method is to close the opening on one side of a through hole drilled in an insulating substrate with copper foil made of printed wiring, insert a dielectric material with a metal film on one side into the through hole, and then connect the copper foil and metal film to the through hole. An electrode plate is provided which connects the dielectric and moves along the upper surface of the dielectric.

Embodiments of the present invention will be described in detail below based on the drawings.

Figure 1 is a perspective view of the trimmer capacitor, Figure 2 is its ■-
■It is a line sectional view.

A semicircular through hole 2 with a certain width is formed in the insulating substrate 1.
A copper foil 3 is provided on the back surface of the insulating substrate 1 by printed wiring to close the opening of the through hole 2.

A dielectric material 4 is inserted into the through hole 2.

This dielectric 4 has a shape that fits perfectly into the through hole 2, and a metal film 5 is vapor-deposited on the back side of the dielectric 4 facing the copper foil 3 to bring it into surface contact with the copper foil 3, and cream solder is applied. Use to solder.

On the other hand, an electrode plate 6 is rotatably provided on the back surface of the insulating substrate 1.

This electrode plate 6 has a solder portion 6a having the same shape as the through hole 2 and a constant width, and a band-shaped support arm 6b extending from the center of the circle to the center of the inner peripheral surface of the solder portion 6a.

A hole 7 is provided on the center of the circle at the end of the support arm 6b, through which the shaft 8 passes, and the shaft 8 is inserted into a hole 9 provided on the center of the circle of the through hole 2 on the insulating substrate 1.

The head 8a of the shaft 8 is soldered to the electrode plate 6 to rotatably support the electrode plate 6.

The shaft 8 has its tip penetrated from the back surface of the insulating substrate 1, and also penetrates the copper foil 3' provided on the back surface of the insulating substrate 1, and by caulking and widening the tip, it is brought into sufficient contact with the copper foil 3', and I have stopped removing it.

This copper foil 3' is made of a beryllium copper alloy with gold plating applied to the contact part with the shaft 8, and is not connected to the copper foil 3 described above, but is connected to a separate electronic circuit from each of the copper foils 3 and 3'. Connect to parts, etc.

Therefore, the electrode plate 6 is installed so as to be rotatable along the upper surface of the dielectric 4.

In the trimmer capacitor having the above configuration, as shown in FIG. 3, the electrode plate 6 is rotated to overlap a part of the electrode plate 6 on the dielectric 4, and the overlapping area of the two is changed by the electrode plate 6. As a result, the capacitance changes continuously.

According to the present invention, since the dielectric material serving as the first electrode is embedded in the insulating substrate, the dimension in the thickness direction is reduced, which has the advantage that devices such as electronic wristwatches can be made smaller and thinner.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a trimmer capacitor showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a perspective view of the trimmer capacitor showing a state in which the electrode plate is moved. be. 1...Insulating substrate, 2...Through hole, 3...
...Copper foil, 4...Dielectric material, 5...
Metal film, 6... Electrode plate.

Claims (1)

[Scope of utility model registration request] An opening on one side of a through hole formed in an insulating substrate is closed with a copper foil formed by printed wiring, a dielectric material having a metal film on one side is inserted into the through hole, the copper foil and the metal film are connected, and the dielectric material is A trimmer capacitor that has an electrode plate that moves along the upper surface of the body.