JPH043485Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a thin variable capacitor having a small thickness.

[Conventional technology]

Generally, this type of thin variable capacitor is used in electrical equipment that requires compactness, such as card-type radio receivers.

As this type of thin variable capacitor, a "small variable capacitor" has been proposed in Japanese Utility Model Publication No. 58-24430.

[Problem that the invention attempts to solve]

Conventionally, as typified by the one described in the above-mentioned publication, rotor plates and stator plates are simply laminated alternately, and the area facing the stator plate is variably adjusted by rotating the rotor plate. is forming. Therefore, each stator plate is supported only by a plurality of struts installed at its ends, and because the stator plate is thin, it is susceptible to displacement due to vibrations, shocks, temperature changes, etc. However, there was an inconvenience that the capacity became unstable.

The present invention was devised in view of these points, and is a thin and highly reliable product that can stably support the stator plate, always maintains capacitance changes at an appropriate value, has excellent durability, and is highly reliable. The purpose is to obtain a shape variable capacitor.

[Technical means to solve the problem]

The thin variable capacitor of the present invention includes a pair of metal frames, a pair of stator fixing pieces arranged inside each of these frames, and a pair of stator fixing pieces arranged between these frames and the stator fixing pieces. In addition, in a thin variable capacitor having a stator plate in which a hot-side electrode and a ground-side electrode outside the hot-side electrode are arranged on the same plane, the hot-side electrode of the stator plate is arranged to adjust the capacity. The stator plate is fixed by holding an unused portion between the stator fixing pieces and holding the ground side electrode between the war frames.

[Effect]

In the present invention, the thin stator plate is clamped and fixed from both sides by the stator fixing pieces and the frame over the entire circumference of the part that is not used for adjusting the capacity between the thin stator plate and the rotor plate. In other words, the stator plate is fixed around the entire circumference by holding the part of the hot side electrode that is not used for capacity adjustment between the stator fixing pieces and holding the ground side electrode outside the hot side electrode between the frames. . As a result, the stator plate is fixed extremely stably, and even if the thin variable capacitor vibrates, receives shock, or experiences external temperature changes, the distance between the stator plate and rotor plate is always maintained constant. The capacity of the thin variable capacitor becomes stable and reliability increases.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

1 to 5 show an embodiment of the present invention,
FIG. 1 shows the whole, and FIG. 2 shows the disassembled state.

In this embodiment, each component is made as thin as possible and laminated in the thickness direction. Furthermore, for convenience, FIGS. 1 and 2 show each component in a vertically stacked state.

The thin variable capacitor 1 of this embodiment is formed by incorporating each component between an outermost metal front frame 2 and a rear frame 3. and,
A metal rotor shaft 4 is rotatably supported by each of the frames 2 and 3. That is, the rotor shaft 4 has a flange 4a provided on the front side in contact with the inner surface of the front side frame 2, and a large diameter shaft portion 4b located below the flange 4a is inserted into the bearing center hole 2a of the front side frame 2. It is rotatably supported on a bearing. Also, rotor shaft 4
has a serration shaft portion 4c having a substantially oval cross section above the flange 4a, and a small diameter shaft portion 4d formed above the serration shaft portion 4c.
is rotatably supported by a rear frame bearing center hole 3a of the rear frame 3. A drive gear 5 for rotating the rotor shaft 4 is fixed to a mounting shaft portion 4e formed below the large shaft portion 4b of the rotor shaft 4 and having a substantially oval cross section by an appropriate means such as caulking. has been done. The serration shaft portion 4c of the rotor shaft 4 has a plurality of substantially semicircular pieces (six pieces in this embodiment).
metal rotor plates 6, 6... have a rotor washer 7 narrowly sandwiched between them, and a substantially oval-shaped center hole 6a is inserted into the serration shaft portion 4.
It is fitted and attached to c. The phases of each of the six rotor plates 6 are made the same.
Further, the outer diameter of the rotor washer 7 is approximately the same as the outer diameter of the flange 4a of the rotor shaft 4, and the thickness thereof is the same or slightly thicker than that of the stator plate 8, which will be described later.
A rotation-side stopper 9, which is smaller than the rotor plate 6 and which restricts the rotation range of the rotor plate 6 with a stator fixing piece 10, which will be described later, is fixed further above the uppermost rotor plate 6. Further, between the front frame 2 and the rear frame 3, a plurality of stator plates 8 (in this embodiment, five) located between each rotor plate 6 are arranged between each other. Spacers 18, 18 made of insulating material and having the same thickness as each rotor plate 6
... are stacked so as to be sandwiched between them, and stator fixing pieces made of an insulating material having the same shape are sandwiched between each frame 2, 3 and the stator plate 8. In addition, the second
For convenience of illustration, only one set of stator plate 8, spacer 18, rotor washer 7, and rotor plate 6 are shown in the figure.

To explain further, in the front frame 2 and the rear frame 3, four rivets 11, 11, . Rivet insertion holes 12, 12, . . . are formed. Furthermore, recesses 13 and 14 are formed in the center portions of the substrates of the front frame 2 and the rear frame 3 to accommodate the movable member and the fixed piece, respectively. The concave portion 13 of one of the front frame 2 includes a substantially circular portion 13a that accommodates the annular rotor guide portion 10a of the lowermost stator fixing piece 10, and two stator fixing portions 10b, 1 of the stator fixing piece 10.
Diametrically opposed side portions 13 that accommodate 0b
b, 13b. The recess 14 of the other rear frame 3 is a substantially circular portion 14a that accommodates the annular rotor guide portion 10a of the uppermost stator fixing piece 10 and the rotating rotation stopper 9.
and diametrically opposed side portions 14b, 14b that accommodate the two stator fixing pieces 10b, 10b of the stator fixing piece 10. Then, the rotor guide portion 10 of each stator fixing piece 10
A is formed to be thinner than the stator fixing parts 10b, 10b (shaded area in FIG. 4) by the thickness of the rotor plate 6 so that the rotor plate 6 can rotate. Further, at each corner of the rear frame 3, a ground side terminal 16 serving as a ground side electrode is provided to protrude in the radial direction. Furthermore, each stator plate 8 has the same external shape as the front frame 2 and the rear frame 3, and has a stator plate center hole 8a in the center in which the rotor washer 7 can rotate inside, and a stator plate center hole 8a at the four corners. A rivet insertion hole 8b through which each rivet 11 passes is bored in the portion. And the stator plate 8 has 1
A plurality of (four in this embodiment) hot side holes are provided in the range in which the two rotor plates 6 rotate, that is, in the portions corresponding to the circular portions 13a and 14a of the recesses 13 and 14 of the front frame 2 and the rear frame 3. Electrodes 19a, 19b, 19c, 19d are formed, and each hot side electrode 19a, 19b,
Hot side terminals 20 from 19c and 19d respectively
a, 20b, 20c, and 20d are led out to the outside in substantially parallel manner. Then, the outside of these hot side electrodes 19a...19d, that is, the recesses 13, 14 of the front side frame 2 and the rear side frame 3
Ground-side electrodes 21a and 21b are formed in portions corresponding to the portions of the substrate where are not formed, respectively. Each of these electrodes 19a, 19b, 19c,
19d, 21a, and 21b are each made of an extremely thin metal plate, and as shown in FIG. 5, they are laminated with thin films 22, 22 from both the upper and lower surfaces so as to maintain a predetermined positional relationship. It is integrally formed. In addition, each spacer 18 protects the rotor plate 6 from dust and prevents deformation such as warping of the rotor plate 6 and stator plate 8 to stabilize the capacity. 2 and the rear frame 3. In the center of the spacer 18,
A spacer center hole 18a having a size that allows rotation of the rotor plate 6 is bored therein, and the spacer is formed in an annular shape as a whole, and rivet insertion holes 18b, 18b... are bored in each of the four corners. There is.
In addition, these hot side terminals 20a, 20b, 20c, 20d are provided at positions corresponding to the hot side terminals 20a... of the respective hot side electrodes 19a... of the adjacent stator plate 8 which are part of the annular shape. A substantially trapezoidal stopper portion 18c for fixing is formed. Since these hot-side terminals 20a are not used for capacity adjustment, a stopper portion 18c is provided to also serve to fix the stator plate 8. In addition, the recesses 13 and 1 of each frame 2 and 3
Each stator fixing piece 10 is housed in and fixed to 4.
, which guides the rotation of the rotor plate 6 and protects it from dust, and protects the rotor plate 6 and stator plate 8.
The stator plate is fixed in such a way as to prevent deformation such as warpage, thereby stabilizing the capacity and regulating the center angle of rotation of the rotor plate 6. Therefore, this stator fixing piece 10 holds down the annular rotor guide portion 10a that supports the rotor plate 6 from the outside and the hot side electrodes 19a of the stator plate 8, which are not used for capacity adjustment. Stator fixing part 1 consisting of
0b and 10b. Further, the substantially trapezoidal stator fixing part 10b, which is one of the stator fixing parts 10b and is located at a position corresponding to each hot side terminal 20a of the adjacent stator plate 8, is such that the stopper 9 comes into contact with the end surface in the circumferential direction. Therefore, it also serves as a stationary stopper 10c that restricts the rotation range of the rotor plate 6 that rotates together with the stopper 9. Each stator fixing piece 10 has fixing pins 23, 23... protruding from each stator fixing piece 10 directed outward toward small fixing holes 24, 24... bored in the corresponding rear frame 3 and front frame 2. and pass through each rear frame 3.
It is fixed to the rear frame 3 and the front frame 2 by caulking the tips of the fixing pins 23, 23, . . . that protrude outward from the front frame 2. In addition, each hot side electrode 19a, 19
b, 19c, 19d hot side terminals 20a, 20
The portions b, 20c, and 20d projecting outward from the thin variable capacitor 1 are each integrally connected. On the other hand, on the ground side, the ground side electrodes 21a and 21b of the front frame 2, the rear frame 3, the rotor shaft 4, each rotor plate 6, each rivet 11, and each stator plate 8 are metal-bonded to each other, and side frame 3
The ground potential is set by grounding via the ground side terminal 16 formed at .

Next, the operation of this embodiment will be explained.

In the thin variable capacitor 1 of this embodiment, the capacity can be variably adjusted by rotating the drive gear 5 and rotating the rotor shaft 4 fixed to the drive gear 5. 4
This is done by integrally rotating the respective rotor plates 6 fixed to portion c.

In this embodiment, when supporting each stator plate 8, each hot-side terminal 20a, etc. not used for capacity adjustment of each hot-side electrode 19a, etc. of the stator plate 8 is connected to an insulating stator fixing piece 1.
0, each ground side electrode 21 of the stator plate 8 is held between the stator fixing parts 10b, 10b of
a and 21b are held between metal frames 2 and 3. As a result, each stator plate 8 made of a thin material can be reliably fixed and supported over the entire circumference of the portion that does not face the rotor plate 6, and each stator plate 8 is fixed extremely stably and is made of thin material. Even if the variable capacitor 1 vibrates or receives an impact, the distance between the stator plate 8 and the rotor plate 6 is maintained constant, and the hot side electrode 19a of the stator plate 8 is isolated from the outside, so the temperature remains constant. There is no deformation due to changes, and the capacity of the thin variable capacitor 1 becomes stable, making it highly reliable. Further, the rear stator fixing piece 10 protects the rotor plate 6 from dust and guides the rotor plate 6 to prevent warpage or other deformation, and furthermore, the stator fixing piece 10 on the rotary side and the fixed side stopper 10c protects the rotor plate 6 from dust. Through cooperative action,
The rotation range of the rotor plate 6 can also be restricted.

Further, in this embodiment, in each stator plate 8, each hot side electrode 19a, 19b,
19c and 19d are formed in the center, and these are surrounded by earth side electrodes 21a and 21b from the outside in the radial direction, and each earth side electrode 21a and 21b is metal-bonded with each rivet 11 to have a ground potential. . Therefore, each hot side electrode 19a, 19b, 1
The shielding effect of each earth side electrode 21a, 21b of 9c, 19d becomes high, and each hot side electrode 1
A high-performance thin variable capacitor that eliminates unnecessary radiation of electrons from 9a, 19b, 19c, and 19d to the outside of the thin variable capacitor 1, allows efficient use of electrical energy, and has an extremely stable capacity. It becomes 1. On the other hand, in the conventional example, the stator serving as the hot side electrode is exposed to the outside, and there is unnecessary radiation of electrons from the stator, wasting electrical energy, and the capacitance changes slightly.
However, in this embodiment, there is no such fear at all.

Further, in this embodiment, since the four hot side electrodes 19a, 19b, 19c, and 19d are arranged to face each other within the rotation range of one rotor plate 6, each of the hot side terminals 20a, 20
Four types of mutually independent variable capacitors can be taken out from b, 20c, and 20d. Therefore, if this thin variable capacitor 1 is used in a radio receiver, selective reception of a plurality of frequency bands can be performed at each hot side terminal 2.
This can be easily done by switching the connection state to 0a, 20b, 20c, and 20d. In addition, compared to the conventional example in which a plurality of rotor plates are provided in the same plane, the thin variable capacitor 1 of this example
The shapes of the front-stage frame 2 and the rear-stage frame 3 can be limited to a size that supports one rotor plate 6, and the occupied area is significantly reduced. Furthermore, there is no need to stack a plurality of units that function in different frequency bands in the thickness direction as in the conventional example, and the overall thickness is also extremely thin. Furthermore, it is easy to manufacture and the cost is low.

Furthermore, as in this embodiment, each hot side electrode 19
a, 19b, 19c, 19d as rotor shaft 4
By forming a substantially arc shape centered on 1
A plurality of hot-side electrodes can be opposed to each rotor plate 6. In addition, by changing the radial width of each hot side electrode 19a, 19b, 19c, 19d in the circumferential direction, the unit area in the circumferential direction is changed and the variable state of the capacitance with the rotor plate 6 is adjusted. You may also do so.

Further, the arrangement pattern, shape, etc. of the plurality of hot-side electrodes may be changed as appropriate depending on the application.

In addition, in this embodiment, since the spacers 18 are interposed between each stator plate 8, the spacers 18 are interposed, so that
The annular portion of the spacer 18 can cover the internal rotor plate 6 to provide dustproof properties, and can prevent abrasion damage to the thin rotor plate 6 and stator plate 8 due to dust. Further, the annular portion of the spacer 18 fixes each stator plate 8 over the entire circumference, and the stopper portion 18c prevents hot side terminals 20a, 20 that do not contribute to changes in the capacitance of each stator plate 8.
By pressing the portions b, 20c, and 20d, deformation such as warpage of each stator plate 8 made of thin material can be prevented, and at the same time, deformation of the rotor plate 6 due to deformation of the stator plate 8 can be prevented. As a result, the distance between the rotor plate 6 and the stator plate 8 is always stable, and the capacity of the thin variable capacitor 1 is also stabilized.

Furthermore, in this embodiment, each stator plate 8 made of thin material is connected to the front frame 2, the rear frame 3, each spacer 18, the rear stator fixing piece 10, and the front stator fixing pieces 15a, 15b.
The functions of each part work in tandem with each other to support the stator plate 8 as an annular integral body over the entire circumference, so the overall structure is strong, and each stator plate 8 Moreover, each rotor plate 6 is prevented from being deformed, and the entire rotor plate can be formed thin. Therefore, the gap between each rotor plate 6 and stator plate 8 is constant, and stable capacity can be provided at all times, making it possible to increase the reliability of operation.

It should be noted that the present invention is not limited to the above embodiments, and can be modified as necessary.

[Effect of idea]

Since the thin variable capacitor of the present invention is constructed and operates in this way, it can stably support the stator plate, always maintain the capacitance change at an appropriate value, and has excellent durability. This has the effect of increasing reliability.

[Brief explanation of the drawing]

The drawings show one embodiment of the thin variable capacitor of the present invention, in which Fig. 1 is a half-sectional view showing the whole, Fig. 2 is an exploded perspective view of the whole, and Fig. 3 shows the relative relationship between the rotor plate, stator plate, and spacer. FIG. 4 is a plan view showing the relative relationship between the rotor plate, the rotation side stopper, and the rear stator fixing piece, and FIG. 5 is an enlarged sectional view taken along the line - in FIG. 3. DESCRIPTION OF SYMBOLS 1... Thin variable capacitor, 2... Front stage side frame, 3... Back stage side frame, 4... Rotor shaft, 6... Rotor plate, 8... Stator plate, 9... Rotating side stopper, 10... Stator fixing piece, 18... Spacer, 19a, 19b, 1
9c, 19d...Hot side electrode, 21a, 21b
...Earth side electrode.

Claims (1)

[Claims for Utility Model Registration] 1. A pair of metal frames, a pair of stator fixing pieces arranged inside each of these frames, and a pair of stator fixing pieces arranged between these frames and the stator fixing pieces. In addition, in a thin variable capacitor having a stator plate in which a hot-side electrode and a ground-side electrode outside the hot-side electrode are arranged on the same plane, the hot-side electrode of the stator plate is arranged to adjust the capacity. A thin variable capacitor characterized in that the stator plate is fixed by holding an unused portion between the stator fixing pieces and holding the ground side electrode between the frames. 2. A request for registration of a utility model characterized in that the hot side electrode is formed between the earth side electrodes which are divided into a plurality of parts, and the hot side terminal is led out from between the earth side electrodes. The thin variable capacitor according to item 1.