JPS5938039Y2 - variable porcelain capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a variable magnetic capacitor with improved quality and stabilized characteristics.

A conventional variable ceramic capacitor was constructed as shown in FIG.

That is, 1. A rotor 4 made of dielectric material and having a semicircular rotor electrode 3 formed on its upper surface is laminated on a stator substrate 2 having a semicircular stator electrode 1 formed on its upper surface, and in the center thereof,
A rotor shaft 7 with a head 6 via an insulating washer 5
A plate spring 9 partially provided with a terminal 8 is arranged on the lower surface of the stator board 2, and a rotor shaft 7 is inserted into the plate spring 9.
The head 6 of the rotor shaft 7 and the rotor electrode 3 are electrically and mechanically connected by solder 10, and a terminal 11 is also provided from the stator electrode 1.

According to the configuration, the rotor electrode 3 and the head 6 of the rotor shaft 7 are electrically and mechanically connected with solder 10, but the workability is poor and if the solder connection is not perfect, the function will be affected. However, since the rotor shaft 1 uses the center hole 12 of the stator board 2 as a bearing, a slight gap is required between the two, and the degree of this gap is a factor that affects the stability of the capacitance against shock. Therefore, the quality was unstable.

In addition, the adjustment driver groove 13 provided in the head 6 of the rotor shaft 7 is only in the shape of a straight line, and when performing torque adjustment during assembly, checking capacitance, adjusting the fixed position of k and electrodes, etc. This has the drawback of making it difficult for the driver to engage the driver.

The present invention eliminates the above-mentioned drawbacks of the prior art.

Embodiments of the present invention will be described below with reference to FIGS. 2 to 4 of the drawings.

Reference numeral 14 denotes a rotor-side terminal plate having a disk shape and having a rotor-side terminal 15 protruding from a part of its periphery and a hollow central shaft 16 protruding upward in the center; On the top, a stator substrate 20 is provided with a semicircular stator electrode 17 on the upper surface, a stator terminal 18 provided integrally with the stator electrode 17 protrudes from the outer peripheral surface, and a center hole 19 in the center. It will be done.

That is, the center shaft 16 is fitted into the center hole 19 and positioned.

Further, a rotor side terminal plate 14 is provided on the lower surface of the stator board 20.
A recess 21 into which the rotor side terminal 15 is inserted is provided, and a notch 22 through which the rotor side terminal 15 is drawn out is provided in a part of the peripheral wall of the recess 21.

A rotor 24 made of a ceramic dielectric material and having a semicircular rotor electrode 23 on its upper surface is disposed on the stator substrate 20 .

This rotor 24 also has a central hole 25 in the center that is aligned with the central axis 16, and a notch 26 cut linearly on the peripheral surface on the side where the rotor electrode 23 is not formed is provided.

A bicylindrical flange 27 is installed on the rotor 24.

This flange 27 is formed by injection molding of synthetic resin, and a notch 28 into which the tip of an adjustment screwdriver is fitted is provided at the upper quarter position, and one of the notches 28 is continuously reached at the lower end 1. A vertical groove 29 is formed.

Further, a stepped portion 30 is formed at the lower inner side of the flange 27 over the entire circumference, and a protruding piece 31 that engages with the cutout portion 26 of the rotor 24 is provided on the bottom surface.

This projecting piece 31 is configured to have a dimension slightly shorter than the thickness of the rotor 24.

A plate spring 32 made of a conductive elastic metal material is fitted into the flange 27, and the peripheral edge of the plate spring 320 is engaged with the stepped portion 30 of the flange 270.

A protruding piece 33 is provided on a part of this leaf spring 32, and this protruding piece 33 is bent into an L-shape and fitted into the vertical groove 29 through one notch 28 of the flange 270, and is mechanically coupled. Its lower end is electrically and mechanically connected to the rotor electrode 23 of the rotor 24 by a conductive adhesive 34.

Also, of course, a center hole 35 into which the center shaft 16 is fitted is formed in the center of the leaf spring 32, and the upper end of the center shaft 16 fitted into the center hole 35 is squeezed to integrate the whole.

As shown in FIG. 4, the inner hole of the 7 flange 27 can be made into a hexagonal shape so that the rotation can be adjusted using a hexagonal wrench, and a cross-shaped adjustment driver groove 36 can be provided on the top surface. A provided hexagonal insertion lid 37 can be incorporated.

With such a configuration, when the rotor 24 and the leaf spring 32 are rotated using the notch 28 of the 7-lunge 27, the opposing area between the rotor 2490-tor electrode 23 and the stator electrode 17 is changed. Capacitance can be adjusted.

As the variable ceramic capacitor of the present invention is constructed as described above, the protruding piece of the plate spring and the rotor electrode can be electrically and mechanically connected using conductive adhesive, which requires less assembly work than soldering. This improves performance and eliminates any functional impairment caused by incomplete solder connections.

That is, since the rotor is rotated by the rotational connection between the protruding piece of the flange and the notch of the rotor, no functional failure occurs.

Moreover, the central axis is a fixed axis, a leaf spring is connected to this central axis, and the rotor is also positioned by the flange held by the leaf spring, so that the capacitance against impact is extremely stable.

Furthermore, because the rotor is in close contact with the stator board up to the outer periphery due to the 7-lunge, the rate of change in capacitance due to temperature characteristics is small, making it possible to achieve stable quality and excellent reliability, which has great practical value. It is something.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional variable magnetic capacitor, and FIG. 2 is a cross-sectional view showing an embodiment of the variable magnetic capacitor of the present invention.
FIG. 3 is an exploded perspective view, and FIG. 4 is a perspective view of another embodiment. 14... Rotor side terminal board, 15... Rotor side terminal,
16... Central axis, 17... Stator electrode, 18...
- Stator terminal, 19... Center hole, 20... Stator board, 21... Recess, 22... Notch, 23...
・Rotor electrode, 24... rotor, 25... center hole,
26... Notch, 27... 7 langes, 28... Notches, 29... Grooves, 30... Steps, 31... Projections,
32--Plate spring, 33--Protruding piece, 34--Conductive adhesive, 35--Center hole, 36--Cross-shaped adjustment driver groove, 37--Insertion lid.

Claims (4)

[Scope of utility model registration request] (1) A stator board with a stator electrode on the top surface and a center hole in the center is installed on the rotor-side terminal plate with the center axis erected in the center. A rotor with a notch in a part and a central hole in the center is arranged, and the rotor has a cylindrical shape with a notch in the upper circumferential surface and a protruding piece on the bottom that engages with the notch in the rotor. Place the flange inside this flange:
A part of the locked plate spring is electrically connected to the rotor electrode, and the upper end of the central axis passing through the center hole of the stator substrate and rotor is connected to the upper surface of the plate spring to integrate the whole. Variable ceramic capacitor. (2) The variable ceramic capacitor according to claim 1, wherein the protrusion on the bottom of the flange is made shorter than the thickness of the rotor. (3) The variable ceramic capacitor according to claim 1, wherein the inner hole of the flange has a hexagonal shape into which a hexagonal wrench is inserted. (4) The variable ceramic capacitor according to claim 3, which is a utility model registered claim, in which an insertion cover having a cross-shaped adjustment driver groove on the upper surface is incorporated into the hexagonal inner hole of the flange.