JPH0974049A - Variable ceramic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a desired variable capacitance value by preventing the area of a rotor electrode from changing. SOLUTION: A variable ceramic capacitor has a stator 2 with a stator electrode 3, a rotor 4 which is provided on the stator 2 and at the same time has a rotor electrode 5, a spring 6 which is provided on the rotor 4 and at the same time is electrically connected to the rotor electrode 5, a shaft 7 which passes through the center of the stator 2, the rotor 4, and the spring 6 and becomes a center shaft, and at the same time is electrically connected to the spring 6, and a driver plate 8 which is provided on the spring 6, thus providing a plurality of protruding parts 15 which project toward the outside at the outer- peripheral edge of the rotor 4 with a specific gap, embedding an engagement nib 13 which projects toward a lower part being provided in the outer-periphery edge of the driver plate 8 between adjacent protruding parts 15 of a plurality of protruding parts 15 being provided at the rotor 4, and engaging the rotor 4 to the driver plate 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip type variable porcelain capacitor used in electronic equipment and the like.

[0002]

2. Description of the Related Art A conventional technique will be described below with reference to the drawings.

As shown in FIG. 7, a conventional variable porcelain capacitor includes a stator 71 having a stator electrode 72,
The rotor electrode 74 is provided on the stator 71.
Is provided with a rotor 73. A shaft 75 having a head portion 76 having a driver groove 77 at its upper end penetrates the rotor 73 and the stator 71 via a washer 78. The lower end of the shaft 75 is crimped to a spring 79 provided below the stator 71, which causes the rotor 73 to
Is rotatably pressed against the stator 71. Further, the head portion 76 of the shaft 75 and the rotor electrode 74 are soldered, and the shaft 75 and the rotor electrode 74 are soldered.
It is electrically connected via 0, and the shaft 75 and the rotor 73 are integrated so that the capacity can be adjusted.

[0004]

In the variable porcelain capacitor having the above-mentioned structure, the rotor electrode 74 has the rotor 73.
It is formed by printing a silver-based paste on, and silver and solder have the property of fusing when heated to a certain level or more.

Therefore, when the head portion 76 of the shaft 75 and the rotor electrode 74 are soldered, a certain amount of heat is applied to the solder 8.
When added to 0, the silver forming the rotor electrode 74 fuses with the solder 80, the rotor electrode 74 is absorbed in the solder 80, the area changes, and the desired variable capacitance value cannot be obtained. there were.

Therefore, the present invention uses the head 76 of the shaft 75.
The purpose is to eliminate soldering between the rotor electrode 74 and the rotor electrode 74 and obtain a desired variable capacitance value.

[0007]

In order to achieve this object, a variable porcelain capacitor according to the present invention comprises a stator having a stator electrode, a rotor provided on the stator and having a rotor electrode, and a rotor provided on the rotor. A spring that is provided and is electrically connected to the rotor electrode, a shaft that penetrates through the central portions of the stator, the rotor, and the spring, forms a central axis, and is electrically connected to the spring, and above the spring. A driver plate provided, a plurality of outwardly projecting projections are provided at an outer peripheral end of the rotor at a predetermined interval, and a downwardly projecting engaging claw provided on an outer peripheral end of the driver plate is provided. It is configured such that it is engaged between adjacent protrusions provided on the rotor.

[0008]

With this structure, the engaging claws provided on the outer peripheral end of the driver plate and projecting downward fit between the adjacent projecting portions of the plurality of projecting portions provided on the rotor. It is possible to rotate these together without doing this, and since the rotor electrode is electrically connected to the shaft via a spring, the soldering that was conventionally used can be eliminated, and therefore the area of the rotor electrode can be eliminated. Can be prevented and the desired variable capacitance value can be obtained.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the variable porcelain capacitor 1 shown in FIG. 1 has a stator 2 having a stator electrode 3 on the upper surface thereof, a rotor 4 provided on the stator 2 and having a rotor electrode 5, and a rotor 4 of this type. Springs 6 made of metal provided on the above, and these springs 6,
While penetrating through the central portions of the rotor 4 and the stator 2,
The lower surface of the stator 2 is caulked to move the rotor 4 to the stator 2
Shaft 7 made of metal that is rotatably pressed against
And a driver plate 8 which is provided on the spring 6 and engages with the rotor 4 to adjust the rotation.

As shown in FIG. 3, the driver plate 8 is provided with an adjusting groove 9 on a metal plate with a die or the like, punched into a predetermined shape, and then drawn to obtain an adjusting surface, an outer peripheral wall surface and a lower step. The surface is formed, and the claw portion is integrally formed by bending. The driver plate 8 formed in this way has an adjustment surface 10 provided with a + -shaped adjustment groove 9 for adjustment, An outer peripheral wall surface 11 provided downward from the outer peripheral end of the adjustment surface 10 and a lower step surface 12 provided outward from the lower end of the outer peripheral wall surface 11.
And a downwardly projecting 2 provided on the outer peripheral edge of the lower surface 12 thereof.
One pair of four pairs of engaging claws 13 is provided on all four sides.

Further, the engaging claw 13 provided on the driver plate 8 is provided with a notch, and the protrusion 14 of FIG. 2 provided on the spring 6 is provided at this notch.
Insert it like a pinch, sandwich it, and screwdriver plate 8
And the spring 6 are integrated, and the engaging claw 13 is fitted between the adjacent protruding portions 15 provided on the rotor 4 to engage the driver plate 8 and the rotor 4. As a result, the driver plate 8 is integrated with the spring 6 and the rotor 4, and is rotatably pressed against the stator 2.

Further, as shown in FIG. 4, the lower surface 12 provided on the driver plate 8 has the spring 6
Is abutted on the rotor 4 via a flat portion 16 provided at the outer peripheral end of the driver plate 8, whereby the load applied from above the driver plate 8 when adjusting the capacitance of the variable porcelain capacitor 1 is the outer peripheral wall surface 11 of the driver plate 8. To lower surface 1
Since it is transmitted to the rotor 4 through the flat portion 16 of the spring 6 through the spring 2, the capacitance characteristic of the variable porcelain capacitor 1 can be stabilized without changing the spring property of the spring 6.

Further, the engaging claw 1 of the driver plate 8
Since 3 is formed by bending and has a planar shape, if the side between the protrusions 15 provided on the rotor 4 is made linear as shown in FIG. Since the joint surfaces with the sides between the protrusions 15 are both flat and there is no gap in the joint surfaces, rattling of the driver plate 8 can be prevented.

Further, as shown in FIG. 6, since the engaging claws 13 provided on the driver plate 8 are crimped so as to sandwich the projecting portion 14 provided on the spring 6,
It is formed so that the width becomes narrower toward the tip. As a result, when inserting between the protrusions of the rotor 4, since the tip of the engaging claw 13 is thin, it is easy to insert between the protrusions 15, and the width of the engaging claw 13 becomes thicker as the insertion progresses. Is firmly engaged with.

[0016]

As described above, according to the present invention, the downwardly projecting engaging claws provided on the outer peripheral edge of the driver plate are
Since the multiple protrusions on the rotor fit between the adjacent protrusions, they can rotate together without soldering, and the rotor electrode is electrically connected to the shaft via a spring. Since they are electrically connected to each other, conventionally used soldering can be eliminated, a change in the area of the rotor electrode can be prevented, and a desired variable capacitance value can be obtained.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view of the variable porcelain capacitor.

FIG. 3 is a perspective view of a driver plate of the variable porcelain capacitor.

FIG. 4 is a sectional view of the variable porcelain capacitor.

FIG. 5 is a top view of a rotor of the variable porcelain condenser.

FIG. 6 is a front view showing an engaging claw portion of the variable porcelain capacitor.

FIG. 7 is a sectional view of a conventional variable porcelain capacitor.

[Explanation of symbols]

 1 Variable Porcelain Capacitor 2 Stator 3 Stator Electrode 4 Rotor 5 Rotor Electrode 6 Spring 7 Shaft 8 Driver Plate 9 Adjustment Groove 13 Engaging Claw

Claims (4)

[Claims] 1. A stator having a stator electrode, a rotor provided on the stator and having a rotor electrode, a spring provided on the rotor and electrically connected to the rotor electrode, and these stators. A shaft that penetrates through the center of the rotor and the spring and serves as a central axis and that is electrically connected to the spring, and a driver plate provided on the spring are provided, and project outwardly at the outer peripheral end of the rotor. A plurality of protruding portions provided at predetermined intervals, and downwardly projecting engaging claws provided on the outer peripheral end of the driver plate are provided between adjacent protruding portions of the plurality of protruding portions provided on the rotor. A variable porcelain capacitor fitted with the rotor and the driver plate. 2. A plurality of projecting parts projecting outward from the outer peripheral end of the rotor have straight sides between adjacent projecting parts, and are provided on the outer peripheral end of the driver plate between these projecting parts. The engaging claw protruding downward is engaged.
Variable porcelain capacitor described in. 3. The variable porcelain capacitor according to claim 1, wherein the engaging claw provided on the outer peripheral end of the driver plate and protruding downward is made thinner toward the tip. 4. The driver plate is provided with an adjusting surface provided with an adjusting groove, an outer peripheral wall surface provided downward from an outer peripheral end of the adjusting surface, and an outer surface extending from a lower end of the outer peripheral wall surface. A lower step surface and at least one engaging claw provided on an outer peripheral end of the lower step surface and projecting downward, wherein the lower step surface directly or indirectly abuts on the rotor. The variable porcelain capacitor according to claim 3.