JPS60113920A - Variable porcelain capacitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a horizontal adjustment type variable ceramic capacitor used in various electronic devices.

Conventional Structures and Problems Recently, there has been a demand for variable ceramic capacitors V of a lateral adjustment type that can be adjusted from the side when used by being incorporated into a printed circuit board.

Conventional variable ceramic capacitors of this type have been constructed as shown in FIGS. 1 to 3. A stator terminal 3 and a rotor terminal 4 disposed from the top surface to the outer surface of the case 2 are insert-molded into a case 2 made of a cylindrical insulator having a step 1 at the middle of the bulwark so as to close the bottom surface. 2, a plate-shaped stator 6 made of a ceramic dielectric material and having a semicircular stator electrode 5 on the lower surface that contacts and conducts with the stator terminal 3; A rotor 9 made of metal with a driver groove 8 for adjustment
The contact piece 4a of the rotor terminal 4 is elastically pressed against the upper surface of the rotor terminal 9 to form the capacitor body 10, the positive terminal 11 and the negative terminal 12 are insert-molded, and the positive terminal 4 is inserted into the middle part. Terminal 11, negative terminal 1
A terminal plate 13 made of synthetic resin is provided with an exposed portion 2 to enable connection of the stator terminal 3 and rotor terminal 4 of the capacitor body 10 described above, and is assembled into the capacitor body 10 described above, and the stator terminal 3 and the positive terminal are connected to each other. 11. The rotor terminal 4 and the negative terminal 12 were electrically and mechanically connected by solder 14.

In such a configuration, the terminal plate 13 is connected to the positive terminal 11
, since the negative terminal 12 is inserted and molded, the volume becomes large and the external dimensions as a variable ceramic capacitor become large. In addition, there was a drawback that the materials and processing costs were high, making it disadvantageous in terms of cost.

OBJECTS OF THE INVENTION The present invention eliminates the following two drawbacks of the conventional technology, and aims to provide a small and inexpensive variable ceramic capacitor.

Structure of the Invention In order to achieve the above object, the present invention provides a cylindrical case in which a stator terminal is inserted in the bottom, a rotor terminal is inserted in the peripheral wall, and a stepped part is inserted in the middle of the case, and a semicircular case is provided in the lower surface that contacts the stator terminal. A plate-shaped stator made of a dielectric material with stator electrodes formed therein, and a metal rotor having a semicircular protrusion on the lower surface and adjustment grooves on the upper surface are housed, and the rotor and rotor terminals are connected electrically. The capacitor body connected to the capacitor body is covered with a cap made of an insulating material having an opening in the ceiling.A terminal mounting part with several holes or grooves is provided on both sides of this cap, and the above-mentioned stator terminal and rotor terminal are connected to the terminal mounting part. It is constructed by incorporating a positive end P and a negative terminal which are connected and have a connecting leg to the printed circuit board protruding from the side.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 4 to 9 of the drawings.

Reference numeral 15 denotes a cylindrical case made of synthetic resin with a step 16 formed in the middle thereof.A stator terminal 17 is inserted into the bottom of this case 15 so as to form the bottom surface. A contact piece 17a is provided inside the case 16 and is cut upward, and a lower end portion 17b is drawn out below the side surface of the case 16. Further, a rotor terminal 18 is inserted into the peripheral wall of the case 160, with an upper end 18a protruding from the upper end surface of the case 16 and a lower end 18b extending downward from the side surface of the case 16.

Inside this case 16, there is a semicircular stator electrode 1 on the bottom surface.
A plate-shaped stator 20 made of a dielectric material and provided with 9 is housed and positioned at the stepped portion 16.

A straight portion 20 a is formed in a part of the stator 20 so that it does not rotate within the case 16 . Furthermore, the stator electrode 19 of the stator 2o contacts the contact piece 17a of the stator terminal 17 and is electrically conductive.

The stator 20 has a disc-shaped metal protrusion 21 on the upper surface, a semicircular protrusion 21 on the lower surface, and a supporting protrusion 22 to maintain parallelism, and a rotor having a cross-shaped adjustment groove 23 on the upper surface. 24 are arranged.

A ring-shaped leaf spring 26 is arranged on the upper surface of the case 16 and is made of an elastic metal plate and has several resilient contact pieces 26 formed by cutting and bending. = The end 18a is bent and fixed to the upper surface of the case 15.

A capacitor body 27 is thus formed, and a cap 28 is placed over the capacitor body 27 from above and mechanically coupled by press-fitting or welding. This cap 28 is molded from synthetic resin, and has a circular recess 29 in which the case 16 is fitted on the lower central surface, a hole 3Q in the center of the ceiling of this recess 29, and several holes 31° 32 on both sides of the recess 29. Terminal mounting portions 34 and 35 consisting of mounting grooves 33 are formed.

The terminal mounting portions 34 and 35 of this cap 28 include mounting feet 36 and 37 that are press-fitted into the holes 31 and 32 with a y-shape, fixing feet 38 that are press-fitted into the groove 33, and three A connecting leg 39 to the printed circuit board with a bent portion is provided, and a glass terminal 40 and a negative terminal 41 are press-fitted together.

This positive terminal 40 has a lower end 17 of the stator terminal 17.
b comes into contact with the negative terminal 41, and the lower end 18b of the rotor terminal 18 comes into contact with the negative terminal 41, and this contact portion is welded or
] (=J is electrically and mechanically connected.

Further, a cover plate 42 is coupled to the lower end surface of the case 16 to prevent flux from entering the case 15 during soldering.

With this configuration, if the connecting legs 39 of the positive terminal 40 and negative terminal 41 protruding from the side of the cap 28 are inserted into the mounting holes of the printed circuit board and soldered, the capacitor body 27 can be placed horizontally. Then, the capacity is adjusted by rotating the rotor 24 using a screwdriver from the side of the glint board.

Effects of the Invention As described in 2., the variable ceramic capacitor of the present invention has a configuration in which the positive and negative terminals are incorporated by effectively utilizing a cap that covers the general capacitor body, so that the adjustment direction of the capacitor body is vertical.・It has the same configuration regardless of the horizontal type, and can be manufactured using dog sticks. In addition, after changing the shape of the cap slightly and connecting it to the capacitor body, the positive and negative terminals can be press-fitted into the terminal mounting part of this camp, making it possible to achieve excellent productivity and reduce costs. It will be significantly advantageous. Furthermore, the positioning of the capacitor body, positive terminals, and negative terminals can be performed reliably, and the connection strength with the stator terminals and rotor terminals is also increased, and the overall size can be reduced, making it a dog of industrial value. be.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional variable magnetic capacitor;
The figure is a cross-sectional view of the same, Figures 3a and 3b are cross-sectional views and side views of the terminal plate used in the capacitor, and Figure 4 is a two-sided view showing an embodiment of the variable ceramic capacitor of the present invention. is the same side view,
6 is a bottom view of the same, FIG. 7d is a sectional view of the same, FIG. 8 is an exploded perspective view of the same, and FIG. 9 is a bottom view of the cap used in the capacitor. 15...Case, 16...Step part, 17...
...Stator terminal, 17a...Contact piece, 1
7b...Lower end a18...Rotor terminal, 18a
...Top end, 18b ...Bottom end, 19...
...Stator electrode, 20...Stator, 20a...
・・Straight portion, 21 ・・Protruding portion, 22 ・・・
・Support protrusion, 23...Adjustment groove, 24...
Rotor, 26... Elastic contact piece, 26... Leaf spring, 27... Capacitor body, 28... Cap, 29... Concavity, 30...・Open hole,
31.32...Mounting hole, 33...Take (=
J groove, 34.35...Number of terminals (1 part, 36°37
...Mounting foot, 38...Fixing foot, 39...
...Connection leg, 40... Positive terminal, 41...
... Negative terminal, 42... Lid plate. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 M 11 Figure 3 Figure 4 J) /Do@7 Figure 81 S1

Claims (1)

[Claims] A cylindrical case with stator terminals inserted at the bottom, rotor terminals inserted into the peripheral wall, and a stepped section in the middle of the interior; A cap made of an insulating material that houses a metal rotor with a semicircular protrusion and an adjustment groove on the north side, and has an opening in the ceiling surrounding the capacitor body, which electrically connects the rotor and rotor terminals. A terminal mounting part consisting of mounting holes and grooves is provided on both sides of this cap, and a positive terminal is connected to the above-mentioned stator terminal and rotor terminal, and has a connecting leg to the printed circuit board protruding from the side. A variable ceramic capacitor with a negative terminal inserted.