JPH0432745Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a horizontal adjustment type variable ceramic capacitor used in various electronic devices.

Conventional technology Conventionally, this type of variable magnetic capacitor is shown in Fig. 5~
It is constructed as shown in FIGS. 7a and 7b. That is, the stator terminal 3 and the rotor terminal 4 arranged from the upper surface of the case 2 from the outer surface are insert-molded so as to close the bottom surface of a case 2 made of a cylindrical insulator having a stepped portion 1 in the middle. A plate-shaped stator 6 made of a ceramic dielectric material is provided with a semicircular stator electrode 5 that contacts and conducts with the stator terminal 3 on the lower surface thereof, and has a semicircular protrusion 7 on the lower surface and is adjusted on the upper surface. A rotor 9 made of metal is provided with a driver groove 8 for use.
The contact piece 4a of the rotor terminal 4 is elastically pressed against the upper surface to form the capacitor body 10, the positive terminal 11 and the negative terminal 12 are insert molded, and the positive terminal 11 and the negative terminal 12 are exposed in the middle part. The above-mentioned capacitor main body 10 is provided with a section.
A synthetic resin terminal plate 13 to which the stator terminal 3 and rotor terminal 4 can be connected is assembled into the capacitor body 10 described above, and the stator terminal 3 and the positive terminal 11, and the rotor terminal 4 and the negative terminal 12 are connected by soldering 1.
4, electrically and mechanically connected.

Problems to be Solved by the Invention In this configuration, the positive terminal 11 and negative terminal 12 of the terminal board 13 are insert-molded, so the volume becomes large and the external dimensions of the variable ceramic capacitor become large. It was hot. Another disadvantage was that the materials and processing costs were high, making it disadvantageous in terms of cost.

The present invention eliminates the above-mentioned conventional drawbacks, and aims to provide a small and inexpensive variable ceramic capacitor.

Means for Solving the Problems To achieve this objective, the variable porcelain capacitor of the present invention has a rotor terminal with a shaft made of an aperture eyelet, a stator terminal with a contact, and a case made of a bottomed cylindrical insulator. A metal rotor having stator electrodes formed inside the case, a rotor electrode formed on the lower surface of the stator, and a metal plate having grooves formed on the upper surface and a metal plate having driver grooves formed on the lower surface of the stator. The combined spring is disposed so as to pass through the shaft, and the contacts between the stator electrode and the stator terminal are electrically connected, and the metal rotor is rotatably disposed via the spring, and the upper end of the shaft is disposed so as to be rotatable. The metal rotor and the dielectric are brought into pressure contact with each other by the spring.

Function With the above-described configuration, a horizontal adjustment type terminal can be formed by pressing and bending the metal plate after insert molding in the case.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4.

In FIGS. 1a and 1b, reference numeral 15 denotes a bottomed cylindrical case made of synthetic resin, with an opening at the top, and a stator terminal 16 and a rotor terminal 17 made of metal plates at the bottom. is insert molded.

Cylindrical case 15 at the tip of stator terminal 16
A contact piece 18 is provided by bending at a portion located on the bottom surface of. Also, the rotor terminal 17
A shaft 19 integral with the rotor terminal 17 is provided at the other end by drawing. This shaft 19 has a through hole 20.

The stator terminals 16 and the rotor terminals 17 are bent upward and pulled out laterally in parallel with the outer circumferential side of the case 15. is formed according to the following processing order.

First, as shown in FIG.
A hoop-shaped metal plate 20 having a shape 9 formed thereon is formed, and this metal plate 20 is insert-molded into a case 15 made of synthetic resin as shown in FIGS.
In addition to forming the tip portions of the stator terminal 16 and rotor terminal 17, the connecting portions 21, 22 of the stator terminal 16 and rotor terminal 17 of the case 15,
23 and 24 are cut to form side terminals 25 and 26 connected to the stator terminal and rotor terminal.

Next, as shown in FIG. 4, when the stator terminals 16 and rotor terminals 17 are bent above the case 15, the stator terminals 16 and rotor terminals 17 are pulled out parallel to the outside of the case 15 along the side surface of the case 15. Ru.

The tips of the side terminals 26 connected to the rotor terminals 17 are inserted into the printed circuit board and soldered in the same manner as the tips of the rotor terminals 17 and stator terminals 16.

Next, the stator 27 has a through hole 29 in the center of a ceramic dielectric 28 and a stator electrode 30 on the lower surface.

The metal rotor 31 is formed by pressing a metal plate such as brass material, and has a semicircular rotor electrode 32 on the bottom surface.
It has a through hole 33 in the center, and a V-shaped groove 36 for connecting a claw 35 of a spring 34, which will be described later, on the upper surface.

The spring 34 also has four bent claws 35 on the lower side and four bent pieces 37 on the upper side.

Next, the driver plate 38 is made of a metal plate and has a through hole 39 and a driver groove 40.

The driver plate 38 is connected to the spring 3 described above.
As shown in FIG. 1, the four upper bent pieces 37 of No. 4 are connected by welding or the like.

Next, to explain these assemblies, as shown in FIG.
The metal rotor 31 is rotatably fitted and stacked on top of the metal rotor 31, and the spring 34 is attached to the claw portion 3.
5 is stacked with the metal rotor 31 facing downward and engaged in the V-shaped groove 36 of the metal rotor 31.

The shaft 19 penetrates through the central holes of the stator 27, the metal rotor 31, and the spring 4.

Next, the upper end portion 41 of the shaft 19 is expanded and the upper surface of the spring 34 is pressed, so that the metal rotor 31 and the stator 27 are held between the metal rotor 31 and the stator 27 by the pressure of the spring 34.

To adjust the capacitance after soldering to the printed circuit board, use the adjusting groove 40 of the driver plate 38.
Insert the adjustment screwdriver into the spring 34.
Rotating the metal rotor 31 through the rotor electrode 3
The capacitance is adjusted by changing the opposing area between the stator electrode 2 and the stator electrode 30.

Effects of the invention As described above, the variable magnetic capacitor of the invention has the following advantages: (1) Unlike the conventional method, a horizontal adjustment type terminal, a positive terminal, and a negative terminal are separately provided and connected to the stator terminal and rotor terminal of the capacitor body. Horizontal adjustment type terminals can be formed by simply pressing and bending the metal plate after insert molding into the case, and this metal plate can also be used for forward adjustment and reverse adjustment types. Can be used in common by simply changing the shape.

Therefore, terminal processing is easy, productivity is excellent, and costs can be reduced.

(2) Since side terminals connected to the stator terminals and rotor terminals are provided on the side of the case, soldering to the printed circuit board is possible at three locations: the rotor terminal, the stator terminal, and the side terminal.

Therefore, it is stable against the load during adjustment,
There are no problems such as deformation of the terminal or change in characteristics. Further, the case can be soldered while being raised above the printed circuit board surface due to the stoppers provided on the rotor terminal, stator terminal, and side terminal, and there is no problem such as rising flux.

[Brief explanation of the drawing]

Figures 1a and b are top and cross-sectional views showing one embodiment of the variable ceramic capacitor of the present invention, Figure 2 is a top view of the metal fittings of the capacitor, and Figures 3a and b are top views of the case of the capacitor. Fig. 4 is an exploded perspective view of the driver plate, spring, metal rotor, stator, and case of the same capacitor; Fig. 5 is a perspective view showing a conventional variable ceramic capacitor;
FIG. 6 is a sectional view of the same, and FIGS. 7a and 7b are a sectional view and a bottom view of the terminal plate of the same capacitor. 15...Case, 16...Stator terminal, 17
...Rotor terminal, 18...Contact piece, 19...Shaft,
26... Side terminal, 27... Stator, 30...
Stator electrode, 31...metal rotor, 32...rotor electrode, 34...spring, 38...driver plate.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A stator made of a dielectric material in which a semicircular stator electrode is formed on the bottom surface of a cylindrical case with stator terminals and rotor terminals inserted at the bottom and a step inside. , a metal rotor having a semicircular rotor electrode formed thereon and a metal fitting having an adjustment groove are housed, the stator and the stator terminal, and the rotor and the rotor terminal are electrically connected, and the stator terminal and the rotor terminal are electrically connected to each other. A variable ceramic capacitor formed by bending a case drawer part and pulling it out in a direction perpendicular to the adjustment groove of the metal fitting. (2) The variable ceramic capacitor according to claim 1, which has a side terminal connected to a stator terminal and a rotor terminal, which is provided on the side surface of the case.