JPH0118565B2 - - Google Patents

Description

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

Conventional Structures and Problems There has recently been a demand for variable magnetic capacitors of a lateral adjustment type that can be adjusted from the side when incorporated into a printed circuit board.

Conventional variable ceramic capacitors of this type have been constructed as shown in FIGS. 1 to 3. That is, stator terminals 3 are placed in a case 2 made of a cylindrical insulator having a stepped portion 1 in the middle so as to close the bottom surface.
A rotor terminal 4 arranged from the upper surface to the outer surface of the case 2 is insert-molded, and a semicircular stator electrode 5 is provided on the lower surface of the case 2 to be in contact with the stator terminal 3 for conduction. A plate-shaped stator 6 and a rotor 9 made of metal having a semicircular protrusion 7 on the lower surface and a driver groove 8 for adjustment on the upper surface are housed, and the rotor terminal 4 is in contact with the upper surface of the rotor 9. The capacitor main body 10 is configured by elastically press-fitting the pieces 4a, and the positive terminal 11
and a negative terminal 12 are insert-molded, and an exposed part of the positive terminal 11 and negative terminal 12 is provided in the middle part, and the stator terminal 3 and rotor terminal 4 of the capacitor body 10 described above can be connected to the synthetic resin terminal. The plate 13 is attached to the capacitor body 10 described above.
and the stator terminal 3 and the positive terminal 11,
The rotor terminal 4 and the negative terminal 12 were electrically and mechanically connected by solder 14.

In such a configuration, since the positive terminal 11 and the negative terminal 12 are insert-molded in the terminal plate 13, the volume becomes large and the external dimensions of the variable ceramic capacitor become large. Another disadvantage was that the materials and processing costs were high, making it disadvantageous in terms of cost.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, 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 with a stator terminal inserted in the bottom, a rotor terminal inserted in the peripheral wall, and a stepped part in the middle of the case, and a semicircular case in contact with the stator terminal on the bottom surface. 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. A cap made of an insulating material with an opening in the ceiling is placed over the capacitor body connected to the capacitor body, and a terminal mounting part with mounting holes and grooves is provided on both sides of this cap, and the above-mentioned stator terminal and rotor terminal are connected to this terminal mounting part. It is constructed by incorporating a positive terminal and a negative terminal with connection legs to the printed circuit board protruding from the sides.

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 stepped portion 16 formed in the middle thereof.A stator terminal 17 is inserted into the bottom of the case 15 so as to form the bottom surface.
There is a contact piece 17a cut upward inside the case 15.
is provided, and the lower end portion 17b is drawn out below the side surface of the case 15. Also, this case 15
A rotor terminal 18 having an upper end 18a protruding from the upper end surface of the case 15 and a lower end 18b extending downward from the side surface of the case 15 is inserted into the peripheral wall of the rotor terminal 18. A plate-shaped stator 20 made of a dielectric material and having a semicircular stator electrode 19 on the lower surface is housed in the case 15 and positioned by the stepped portion 16 . In addition, a part of this stator 20 has a straight portion 2.
0a is formed so that it does not rotate within the case 15. Furthermore, the stator electrode 19 of this stator 20 contacts the contact piece 17a of the stator terminal 17 described above and is electrically conductive.

The stator 20 has a disc-shaped protrusion 21 made of metal on the upper surface and a semicircular protrusion 21 on the lower surface, a support protrusion 22 for maintaining parallelism, and a cross-shaped adjustment groove 23 on the upper surface. A rotor 24 is arranged.

A ring-shaped leaf spring 26 is arranged on the upper surface of the case 15 and is made of an elastic metal plate and has several elastic contact pieces 25 formed by cutting and bending.
The rotor terminal 18 is fixed to the upper surface of the case 15 by bending the upper end 18a protruding from the upper surface of the case 15.

The capacitor body 27 is thus formed, and the cap 28 is attached to the capacitor body 27 from above.
are covered and mechanically connected by press-fitting or welding. This cap 28 is molded from synthetic resin, and has a circular recess 29 in the lower center surface into which the case 15 is fitted, an opening 30 in the center of the ceiling surface of this recess 29, and mounting holes 31 on both sides of the recess 29.
32 and a terminal mounting portion 34 consisting of a mounting groove 33,
35 is formed.

The terminal mounting portions 34 and 35 of the cap 28 have mounting feet 36 that are press-fitted into the mounting holes 31 and 32, respectively.
37, a fixed foot 38 press-fitted into the mounting groove 33,
A positive terminal 40 and a negative terminal 41 are press-fitted and have connection legs 39 to the printed circuit board that protrude laterally and have three bent portions.

The lower end 17b of the stator terminal 17 is in contact with the positive terminal 40, and the lower end 18b of the rotor terminal 18 is in contact with the negative terminal 41, and these contact parts are electrically and mechanically connected by welding or soldering. has been done.

Further, a cover plate 42 is coupled to the lower end surface of the case 15 to prevent flux from entering the hose 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 printed circuit board.

Effects of the Invention As described above, the variable ceramic capacitor of the present invention has
Since the configuration effectively utilizes the cap that covers the capacitor body to incorporate the positive and negative terminals, the capacitor body has the same configuration regardless of whether the adjustment direction is vertical or horizontal, allowing for mass production. 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 the cap, resulting in excellent productivity and cost savings. It will be significantly advantageous. Furthermore, the positioning of the capacitor body, positive terminals, and negative terminals can be performed reliably, the connection strength with the stator terminals and rotor terminals is increased, and the overall size can be reduced, making it of great industrial value. .

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a conventional variable ceramic capacitor, Fig. 2 is a sectional view thereof, Figs. A top view showing an example of a ceramic capacitor, FIG. 5 is a side view, FIG. 6 is a bottom view, FIG. 7 is a sectional view, FIG. 8 is an exploded perspective view, and FIG. 9 is a side view of the same. FIG. 3 is a bottom view of a cap used for 15...Case, 16...Step, 17...Stator terminal, 17a...Contact piece, 17b...Lower end, 18...Rotor terminal, 18a...Upper end, 18
b... lower end portion, 19... stator electrode, 20...
Stator, 20a... straight part, 21... protruding part,
22... Support protrusion, 23... Adjustment groove, 24... Rotor, 25... Elastic contact piece, 26... Leaf spring, 2
7...Capacitor body, 28...Cap, 29
... recess, 30 ... hole, 31, 32 ... mounting hole, 33 ... mounting groove, 34, 35 ... terminal mounting part, 36, 37 ... mounting foot, 38 ... fixed foot, 3
9...Connection leg, 40...Positive terminal, 41...Minus terminal, 42...Lid plate.

Claims (1)

[Claims] 1. A stator made of a dielectric material, in which a stator terminal is inserted into the bottom, a rotor terminal is inserted into the peripheral wall, and a semicircular stator electrode is formed on the bottom surface of a cylindrical case having a stepped portion in the middle thereof, and the stator electrode is in contact with the stator terminal. A metal rotor with a semicircular protrusion on the lower surface and an adjustment groove on the upper surface is housed, and the rotor and the rotor terminals are electrically connected to the capacitor body, which is connected to an insulating material having an opening on the ceiling surface. A terminal mounting part consisting of mounting holes and grooves is provided on both sides of this cap, and the stator terminal and rotor terminal are connected to the terminal mounting part, and connection legs to the printed circuit board are protruded from the side. A variable ceramic capacitor that incorporates a positive terminal and a negative terminal.