JPS5838923B2 - Capacitor and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a capacitor and a method for manufacturing the same, in which a capacitor is manufactured by integrally molding and fixing an insulating material to a conductive plate, and assembling a rotor, rotor shaft, etc. to the molded plate. Therefore, it is an object of the present invention to provide a capacitor that can be manufactured extremely easily and at low cost, and a method for manufacturing the same.

In conventional trimmer capacitors, for example, a stator plate consisting of a stator and stator terminals, a rotor terminal plate, a rotor plate, a rotor shaft, and an insulating material are manufactured separately, and the stator plate is placed on the surface of the insulating plate. The rotor shaft was assembled by caulking with rivets and inserting the rotor shaft through the insulating plate and the rotor terminal plate with the rotor terminal plate placed on the back side of the insulating plate.

However, with this conventional manufacturing method, the positioning of each part during assembly and the rivet caulking work described above are troublesome and require skill, and furthermore, if the rivet caulking is defective, the caulked parts may loosen and each This method had drawbacks such as causing looseness between parts and impairing the performance of the trimmer capacitor.

The present invention eliminates the above-mentioned drawbacks, and the following, together with the drawings, describes a method of manufacturing a trimmer capacitor according to the present invention.
An example will be explained.

First, a predetermined conductive metal flat plate hoop material is punched out using a press, and as shown in FIG.
A metal plate group 2 consisting of two metal plates 1 is continuously and integrally formed in the longitudinal direction of the hoop material.

Each metal plate 1 consists of a rotor terminal plate (earth terminal) 3 and a stator plate 4, respectively.

The rotor terminal plate 3 is a hole 3 into which a rotor shaft, which will be described later, is inserted.
a and a rotor terminal part 3b, and a locking part 3C is formed at the tip of the terminal part 3b, which is used for locking the terminal part 3b in a hole in a printed circuit board (not shown). ing.

Further, the stator plate 4 is similarly formed with a stator terminal portion 4a and a locking portion 4b.

Adjacent metal plates 1 on the same row are connected by a pair of bridge parts 5, and the rotor terminal plate 3 side and the stator plate 4
The sides are connected by a bridge portion 6.

Furthermore, the metal plates in other adjacent rows are the respective terminal portions 3b and 4.
a are integrally and continuously connected.

The rotor terminal plate 3 and the stifter plate 4 are provided with a step portion 7 having a step size d, as shown in FIG. 1B.

The rotor terminal plate 3 is not limited to this shape as long as it can be electrically connected to a rotor plate to be described later and is continuous with the bridge portion 5.

Next, the entire surface of the metal plate group 2 is plated with silver or nickel plating, which has good electrical conductivity and good solderability.
The metal plate group 2 is wound around a roller.

The plating may be performed before the press punching or after the hoop material is once press punched and wound up.

Further, the step portion 7 may be formed after the winding step in order to prevent the step dimension d from being distorted by the winding step.

Next, the metal plate group 2 is sent to a plastic molding process, and as shown by the matte pattern in FIG. shall be.

In each molded plate 11 of the molded plate group 10, the insulating material 9rI-
& As shown in FIG. 2B, on the upper surface of each metal plate 1, a part of the rotor terminal plate 3 and the stator plate 4 are exposed in the hole 9a in a semicircular shape, and the terminal parts 3b and 4a are projected on both sides. Also, on the lower surface, a through hole 9 is provided in a portion corresponding to the hole 3a of the metal plate 1.
b.

A pair of bridge portions 12 made of the synthetic resin described above are formed between adjacent molded plates 11. As a result, the molded plates 11 of the molded plate group 10 are mutually held.

Subsequently, the molded plate group 10 is cut into one or more Cn) rows.

Note that this cutting may be omitted and may also serve as cutting into the required number of capacitors after the assembly process described later.

Note that the stepped portion 7 may be formed using a mold during the synthetic resin molding.

Next, the molded plate group 10 in one or more rows is sent to an assembly process, and the rotor assembly 13 is placed on the upper surface of each molded plate 11 as shown in FIGS. 3A, B, and C. A rotor shaft 8 having a driver groove 8a is inserted and supported in the through hole 9b, and a leaf spring 14 for preventing loosening is attached to a protrusion on the lower surface side of the rotor shaft 8.
Attach by caulking and assemble each trimmer capacitor 15.

The peripheral edge of the leaf spring 14 comes into contact with the lower surface of the insulating material 9.

Note that the leaf spring 14 may not be used.

In this way, a group of m consecutively assembled trimmer capacitors 16 for one row or n rows is completed.

In the above embodiment, the rotor shaft 8 and the leaf spring 14 were individually assembled to each molded plate 11, but the rotor shaft 8 is constructed in such a manner that a plurality of the rotor shafts 8 and leaf springs 14 are connected integrally by a bridge.
, it may be assembled to the molded plate group 10 using the leaf spring 14.

The rotor assembly 13 includes a semicircular rotor plate 17 and a thickness dimension t.
The rotor plate 17 is electrically connected to the rotor terminal portion 3b via the washer 18 and the rotor terminal plate 3.

The rotor plate 1T has a washer 18 above the stator plate 4.
The difference dimension between the thickness dimension t and the step dimension d of the step portion 7 (
t-d) Minute separation.

Here, the distance between the rotor plate 1γ and the stator plate 4 is set by the difference between the washer 18 and the step size of the step portion 7, so the above distance can be set minutely without making the washer 18 excessively thin. It is possible to easily obtain a large capacitance capacitor.

Incidentally, the surface of the rotor assembly 13 may be coated with a thin conductive film in advance, except for the contact surface with the rotor terminal portion 3b. A dielectric film may be interposed therebetween.

Furthermore, in the trimmer capacitor 15, the upper surface of the rotor shaft 8 protrudes from the upper surface of the insulating material 9, but in order to facilitate the operation of engaging the driver in the driver groove 8a,
The upper surface of the rotor shaft 8 may be lower than the upper surface of the insulating material 9.

Next, the trimmer capacitor group 16 in one row or n rows is replaced with a desired number (one or more) of trimmer capacitors or trimmer capacitors as required, such as a single trimmer capacitor 15, a plurality of trimmer capacitors in one row, or a plurality of trimmer capacitors in multiple rows. Cut into capacitor groups.

Next, the terminal portions 3b and 4a of these trimmer capacitors are bent as shown by two-dot chain lines in FIG. 3C.

In addition, in the case of one trimmer capacitor, the bridge parts 6 on both sides
In the case of trimmer capacitors having multiple integrated trimmer capacitors, all the bridge parts 6 and the bridge parts 5 between all the stator plates 4 (blits between the rotor terminal plates 3,
5) are separated from each other.

In this way, a single trimmer capacitor or a trimmer capacitor integrated with a plurality of trimmer capacitors is completed.

Incidentally, the step of bending the terminal portions 3b and 4a may be performed before the final cutting step.

When each of the completed trimmer capacitors 15 is assembled into an electrical device, a driver is engaged with the driver groove 8a of the rotor shaft 8 and the rotor plate 17 is rotated to face the stator plate 4, thereby reducing the opposing area. The capacity is adjusted by making it variable.

In the above embodiment, the metal plate group 2 is
Each row is arranged with its rotor side or stator side facing the same direction, and the final trimmer capacitor is a single unit or a single row configuration, but the rotor terminal portion 3b of each row is A set of metal plates (not shown) may be formed by connecting two rows of capacitors facing each other, and finally a plurality of capacitors may be used as an integrated trimmer capacitor in a two-row format.

In the above embodiment, when a single trimmer capacitor is finally manufactured, the bridge portions 12 are not provided between the molded plates 11 of the molded plate group 10 during the molding process, and the insulating material 9 is formed as a discontinuous one. may be done.

Further, in the trimmer capacitor 15, the insulating material 9 is the metal plate 1.
In particular, the peripheral wall portion of the hole 9a of the insulating material 9 serves to protect the rotor plate 17 and the stator plate 4 from the outside.

Furthermore, although the above embodiments have been described with respect to trimmer capacitors, the present invention is not limited thereto and can be applied to various other capacitors.

As described above, the capacitor and method for manufacturing the same according to the present invention have the following advantages because of the structure as described above.

In other words, the stator plate, rotor terminal plate, and insulating material are integrally fixed to each other at the same time when the insulating material is integrally molded, so the assembly man-hours are significantly reduced compared to assembling them individually one after another. In addition, molding of insulating material has better adhesion strength than welding or gluing, and the structure is extremely robust, making the subsequent assembly of the rotor shaft and rotor plate easier and reducing external forces after assembly. Performance and durability can be improved without fear of displacement of the stator plate or rotor terminal plate even if the stator plate or rotor terminal plate is applied. Also, since the above-mentioned step is provided between the stator plate and the rotor terminal plate, it is easy to install the washer for the rotor shaft. The spacing between the stator plate and the rotor plate can be easily set to a very small distance without the need for excessively thinning, making it easier to assemble and obtaining a higher electric capacity.

In addition, since the insulating material is attached to both sides of the conductive plate instead of one side, the installation strength of the insulating material can be increased, and the structural strength of the stator plate and the rotor terminal board can be increased, making the structure even more stable.

■Also, since the stator plate and the rotor terminal plate of the conductive plate are integrally connected to each other by the connecting part, the conductive plate can be formed from a single conductive flat plate, and material removal is extremely easy. Due to the function of the connecting part, the step of the stator plate and the rotor terminal plate of the predetermined size can be arranged naturally. Also, since the connecting part is exposed from the insulating material, it is easy to cut the connecting part without having to cut the insulating material, and pieces of the insulating material can fly off and enter the rotor plate direction. There is also no possibility of interfering with the rotation function of the rotor shaft.

[Brief explanation of drawings]

1A and 1B are a plan view and a vertical cross-sectional view taken along line I-i of the metal fixing plate group in the middle of the process of an embodiment of the capacitor manufacturing method according to the present invention, and FIGS. 2A and 2B are respectively 3A, B, and C are respectively a plan view and a vertical sectional view taken along the line ■-■ of the molded plate group in the middle of the process, and a plan view, bottom view, and 1-1 in FIG. 3A after the assembly process, respectively. It is a longitudinal cross-sectional view along the line. 1...Metal plate, 2...Metal plate group, 3.
...Rotor terminal board, 3b...Rotor terminal section, 4...Stator plate, 4a...
Stator terminal part, 5, 6.12...Bridge part, 7...Step part, 8...Rotor track 9.
...Insulating material, 10...Molded plate group, 11.
...Molded plate, 13...Yama-Yuu assembly, 14
...Plate spring, 15 ... Trimmer capacitor, 16 ... Trimmer capacitor group, 17 ...
...Rotor plate.

Claims (1)

[Scope of Claims] 1. A conductive plate including a stator plate from which stator terminals are extended and a rotor terminal plate from which rotor terminals are extended, which are arranged close to each other; An insulating material is formed and fixed integrally with the upper surface of each main body part of the plate and the rotor terminal board and the above both terminals exposed, respectively, and an insulating material is inserted and supported by the insulating material and the above-mentioned part of the main body part of the rotor terminal board is inserted and supported. It consists of a rotor shaft that is electrically connected to approximately the center of the exposed portion, and a rotor plate that is rotatable integrally with the rotor shaft and is spaced apart from the upper surface of the stator plate main body, and the stator plate and the rotor A capacitor characterized in that a step of a predetermined size is provided between the upper surfaces of each main body part of the terminal plate. 2. The insulating material is molded and fixed to the periphery of the conductive plate on the upper side of the conductive plate so as to accommodate the rotating rotor plate, and on the lower side, it covers almost the entire surface excluding at least the rotor shaft insertion portion. The capacitor according to claim 1, characterized in that it has a molded and fixed structure. 3. A stator plate with stator terminals extended from the conductive flat plate and a rotor terminal plate with rotor terminals extended from the conductive plate are separated by a step of a predetermined size between the upper surfaces of the main bodies of the stator plate and the rotor terminal plate. a step of forming a conductive plate connected by a connecting portion so as to have a conductive plate connected to the terminal plate for the stator plate and the rotor; A process of integrally molding and fixing an insulating material near the top and bottom surfaces of the terminal board, and inserting and supporting the rotor shaft, on which the rotor plate is provided so as to be integrally rotatable, through the insulating material near the main body of the rotor terminal board. A capacitor is obtained by making the rotor terminal plate main body electrically conductive to a substantially central portion of the exposed portion, separating the rotor plate from the stator plate main body, and separating the connecting portion. A method for manufacturing a capacitor.