JPS6311706Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a small variable capacitor, and an object of the present invention is to provide a compact variable capacitor whose overall thickness is reduced by devising a case structure and whose stator side terminals can be easily taken out.

1 to 3 are a plan view, a vertical sectional view, and a bottom view of one embodiment of the small variable capacitor according to the present invention, and FIG. 4 is an exploded perspective view of the small variable capacitor.

In FIG. 2, a small variable capacitor 21 is constructed by attaching a small variable capacitor main body 23 to a panel plate 24 to which a pulley 22 is assembled.

As shown in FIGS. 1 to 4, the pulley 22 is integrally molded from resin or the like into a tray shape together with a rotor shaft 25, which will be described later.

The pulley 22 has a cylindrical portion 22a, a recessed portion 22b, and a belt winding portion 22c, and a pair of convex portions 22d ₁ and 22d ₂ are integrally formed on the upper surface of the cylindrical portion 22a. Further, the rotor shaft 25 has an oval cross section and has a bearing portion 25a and a screw hole 25b formed in the lower and upper portions, respectively.

The small variable capacitor main body 23 has a base plate 26, which has a hole 26a, four pin parts 26b each having a threaded part formed in the upper part, a pair of mounting parts 26c in the front and back direction in FIG. As shown in Figure 5, the above 1
One stopper portion 26d that abuts the pair of convex portions 22d ₁ and 55d ₂ is integrally formed, and the pulley 2
It is housed in the recess 22b of No. 2. At this time, hole 26
A washer 27 is fitted to the rotor shaft 25 protruding from the rotor shaft 25, and an insulating bushing 28 made of ceramic or the like is fitted to each pin portion 26b. The substrate 26 is electrically connected to the rotor shaft 25, and the pair of mounting portions 26c also serve as a rotor-side ground.

In FIG. 4, the rear pair of pin portions 26b (butshears 28) are further provided with insulating washers 29 ₁ made of polyethylene or the like, a plurality of conductive stator plates 30 ₁ , washers 31, terminal plates 32 ₁ , and short dimensions. A plurality of rotor plates 34 1 are fitted to the stator plate 30 ₁ so as to be integrally rotatable with the rotor shaft 25 and alternately face the stator plate 30 ₁ . On the other hand, the front pair of pin parts 26b (buttons 28)
have a short insulating bushing 33 and a terminal board 32, respectively.
₂ , a plurality of conductive stator plates 30 ₂ , washers 31 , and insulating washers 29 ₂ are respectively fitted in sequence, and a plurality of rotor plates 34 ₂ further fitted to the rotor shaft 25 are fitted to the stator plates 30 ₂ . Facing alternately. Next, as shown in FIGS. 2 and 4, the screws 35 are screwed into the screw holes 25a of the rotor shaft 25, and the rotor plates 34 ₁ and 34 ₂ are tightened.
A washer 41 is fitted into the convex portion 35a of 5.

Reference numeral 42 denotes a push plate, which has a hole 42a and a notch 42b formed in the center and four sides, respectively, and has the four pin parts 2
6b and is tightened and fixed with a nut 43, and at the same time, the convex portion 3 of the screw 35 is inserted into the hole 42a.
5a is inserted. Finally, a resin case 44 is fitted to the peripheral edge of the board 26, and the upper ends of each of the terminal plates 32 ₁ and 32 ₂ are bent as shown by the two-dot chain line in FIG. A pair of notches 44
a to lock the case 44. Thus, as shown in FIG. 2, the small variable capacitor main body 23
The assembly of the pulley 22 is completed, and the variable capacitor 21 is further screwed to the panel plate 24 by the pair of mounting portions 26c.

According to the above-mentioned small variable capacitor village 21, since the pair of stator plate groups 30 ₁ and 30 ₂ are respectively provided on the side of each mounting portion 26c of the board 26, the terminal plates 32 ₁ and
32 ₂ respectively protrude in a direction that does not have each mounting portion 26c of the board 26, and are configured to protrude outward from the case by being guided by a pair of notches 44a of the case 44, respectively. Therefore, the terminal plates 32 ₁ and 32 ₂ are assembled without play due to the guide of the cutout portion 44a, and the distance between each other and the distance between the terminal plates 32 ₁ and 32 ₂ and the mounting portion 26c are also stable and floating. Highly accurate capacitance can be obtained with no fluctuation in capacitance. In addition, as mentioned above, the terminal plates 32 ₁ and 32 ₂ protrude in a direction different from the mounting part 26c and do not interfere with the mounting part 26c, so that the wiring work and soldering work to the terminal boards 32 ₁ and 32 ₂ can be easily performed, such as short circuits, etc. It can be easily done without any inconvenience. Furthermore, since the case 44 does not have an upper plate part, the height of the variable capacitor can be reduced accordingly, and the terminal plate 3
2 ₁ , 32 ₂ outward bending work and notch 44
This facilitates the engagement work with a. Note that the terminal plates 32 ₁ and 32 ₂ in FIG. 1 each protrude upward in the figure;
They may each be made to protrude downward, or one may be made to protrude upward in the figure and the other downward.

Also, according to this small variable capacitor 21, the pulley 22
Since the lower part of the small variable capacitor main body 23 is inserted into the recess 22b, the total height of the variable capacitor main body 23 and the pulley 22 becomes relatively small, and the small variable capacitor 21 can be made thinner.

Next, during the driving operation of the small variable capacitor 21,
When the pulley 22 is rotated by belt drive, the rotor shaft 25 rotates integrally with the pulley 22 with its bearing portion 25a and the convex portion 35a of the screw 35 supported by the base plate 26 and the push plate 42, respectively. As a result, the rotor plates 34 ₁ and 34 ₂ are connected to the stator plates 30 ₁ and 3, respectively.
0 ₂ and rotates while changing the facing area to connect the rotor side ground attachment part 26c and each terminal plate 32 ₁ , 3
A predetermined capacity is variably set between 2 and ₂ .
In addition, when the pulley 22 rotates clockwise in FIG. 1, the convex portion 22d1 of the pulley ₂₂ comes into contact with the stopper portion 26d of the variable capacitor board 26 and stops, and vice versa. 22 rotates counterclockwise, the other convex portion 22d ₂ engages with the stopper portion 2.
6d and stop, thereby allowing the rotor plates 34 ₁ and 34 ₂ to rotate within a range of approximately 180° as described above.

In the above embodiment, the pulley 22 is attached to the small variable capacitor main body 23, but it is not limited to the pulley, and as shown in FIG.
The variable condenser body 23 is placed in the recessed part of the gear body 51 provided with a.
The gear body 51 may be rotationally driven by another gear that meshes with the gear body 51. Alternatively, instead of the gear body 51, as shown in FIG. 7, a gear body 52 having a gear portion 52a on its upper surface may be used, and the gear body 52 may be rotationally driven by a pinion meshing with the gear portion 52a. Also, a dial that can be manually operated may be used instead of the pulley 22.
Further, a scale indicating the rotation angle may be attached to the dial or its peripheral panel.

Further, the stopper mechanism of the above embodiment has a pulley 22.
The pair of convex portions 22d ₁ and 22d ₂ and one stopper portion 26d of the small variable capacitor main body 23 are not limited thereto.On the contrary, as shown in FIG. Also, small variable capacitor body 2
3 may be provided with a pair of stopper portions 26e ₁ and 26e ₂ so that the convex portions 22e are in contact with these, respectively.Also, as shown in FIG.
A pair of convex portions 22f ₁ and 22f ₂ may be provided on the inner wall of 2a, and one stopper portion 26f of the small variable capacitor main body 23 may abut on these, respectively. In each of the above embodiments, if either the pulley 22 or the small variable capacitor main body 23 has only one pair of protrusions or stoppers, the rotor plate 34 ₁ ,
It becomes possible to expand the rotation angle of ₃₄₂ to approximately 360 degrees, and similarly, various rotation angles can be set.

Although the stopper mechanism is not shown in the embodiments shown in FIGS. 6 and 7, any of the stopper mechanisms described above can be applied. Particularly in the embodiment of FIG. 7, the stopper mechanism of FIG. 9 is suitable.

10 to 12 show other embodiments of the screw 35 and washer 41 of the above embodiment,
In either embodiment, the rotational movement of the rotor shaft 25 can be made smooth. In FIG. 10, the screw 53 has a recess 53a on its upper surface, and the pawl 54 fitted into the recess 53a is further fitted into the hole 42a of the push plate 42 so as to be rotatable. In FIG. 11, the screw 55 has a conical portion 55a, the upper end of which is fitted into the hole 42a. In Figure 12, screw 5
6 has a truncated conical portion 56a;
a is fitted into a bearing portion 42c formed by curving the periphery of the hole 42a of the push plate 42 upward.

Further, in each of the above embodiments, the pulley 22 (gear body 5
1, 52) had a roughly tray shape, but the shape is not necessarily limited to this, and a flat disk shape may also be used.

Further, in each of the above embodiments, the variable capacitor board 26 is made of metal, but it is not limited to this, and may be made of an insulating material such as resin, for example, by fitting and fixing the metal pin part 26b thereto, or by integrally molding it during manufacturing. do it. In this case, the push plate 42 etc. may be used as the rotor side ground.

As mentioned above, the small variable capacitor of the present invention can be attached to another board using the mounting plate integrally formed on the variable cap board, making the mounting structure and work extremely easy. The stator plate group is arranged on each mounting plate side of the variable capacitor board, and a pair of stator side terminals are made to protrude to the side where there is no mounting plate part. Since each of the pair of terminals is made to protrude outward by the guide in the notch, the pair of terminals can be assembled without play due to the guide in the notch, and the distance between each other and the mounting portion is stabilized, reducing stray capacitance. It is possible to suppress fluctuations and obtain a highly accurate capacity, and since there is no risk of interference between the pair of terminals and each mounting plate, wiring work to the terminals and soldering work can be easily and accurately performed. In addition, since the case does not have an upper plate, the variable capacitor can be made thinner, and the above-mentioned 1.
It has the advantage of making it easier to guide the pair of terminals to each notch.

[Brief explanation of the drawing]

Figures 1 to 3 are a plan view of an embodiment of the small variable capacitor according to the present invention, a view taken along lines A to J in Figure 1, and a bottom view, and Figure 4 is an exploded perspective view of the small variable capacitor. 5 are vertical cross-sectional partial views of the small variable capacitor, and FIGS. 6 to 12 are views showing modified examples of the small variable capacitor, respectively. 21...Small variable capacitor, 24...Panel board, 2
3...Small variable capacitor body, 22...Pulley, 25
...Rotor shaft, 26... Variable capacitor board, 26b...
...Pin part, 26c...Mounting part, 30 ₁ , 30 ₂ ...
Stator plate, 32 ₁ , 32 ₂ ...Terminal plate, 34 ₁ ,
34 ₂ ... Rotor plate, 42... Push plate, 44... Case, 44a... Notch.

Claims (1)

[Scope of utility model registration request] A substantially rectangular plate-shaped board main body and a portion of both sides of the board main body are integrally formed to protrude outward in parallel with the board main body, each having an upwardly bent step part in the middle thereof. a variable capacitor board having a pair of mounting plate parts; at least one pair of rotor plate groups attached to a rotor shaft supported approximately at the center of the board body part and projecting upward; The pair of mounting plates of the variable capacitor board are comprised of at least one pair of stator plate groups attached to two of each of the four stator columns protruding upward, and four side walls that are open in both the upper and lower directions. The side wall portion of the case, which faces the side that does not have the mounting plate portion of the board main body portion, is attached to the end portion of the case, and the side wall portion of the case that faces the side that does not have the mounting plate portion of the board main body portion is attached to the end portion of the case. It has a pair of notches, each pair of stator plate groups is installed between two stator columns on each mounting plate side, and the stator potential is taken out from each pair of stator plate groups. A small, thin variable capacitor in which the terminals are respectively projected to the outside of the case by guides in a pair of notches in the case.