JPS61134009A - Variable ceramic 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.

2. Description of the Related Art Recently, there has 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.

Conventionally, this type of variable ceramic capacitor is shown in Figs. 7 to 9 (
It was constructed as shown in a) and (b). That is, a stator terminal 3 and a rotor terminal 4 disposed from the top surface of the case 2 from the outside surface are insert-molded into a case 2 which is a cylindrical insulator having a stepped portion 1 in the middle so as to close the bottom surface. 1. A plate-shaped stator 6 made of a ceramic dielectric material V, which has a semicircular stator electrode 5 on its lower surface that contacts and conducts with the stator terminal 3; A rotor 9 made of metal V and having a semicircular protrusion T on the lower surface and a driver groove 8 for adjustment on the upper surface is housed, and the contact piece 4a of the rotor terminal 4 is elastically attached to the upper surface of the rotor 9. The capacitor body 10 is constructed by press-welding the positive terminal 11 and the negative terminal 12, and the glass terminal 11 and the negative terminal 120 are provided in the intermediate portion to form the stator terminal 3 and the rotor of the capacitor body 10. A terminal plate 13 made of synthetic resin to which the terminal 4 can be connected is assembled into the capacitor body 101o described above, and the stator terminal 3 and the positive terminal 11, and the rotor terminal 4 and the negative terminal 12 are connected by solder 14 for electrical and mechanical connections. It was connected and configured.

Problems to be Solved by the Invention In this configuration, the terminal plate 13 is connected to the positive terminal 11.
, since the negative terminal 12 is insert molded,
The volume was large, and the external dimensions as a variable ceramic capacitor were large. In addition, it has the disadvantage that the materials and processing costs are high, making it disadvantageous in terms of cost.

The present invention eliminates the above-mentioned drawbacks of the prior art, and proposes a small and inexpensive variable ceramic capacitor. Insert a stator terminal equipped with a rotor terminal and a contact point into a bottomed cylindrical insulator case with a certain interval and pull it out of the case,
Inside this case, the stator electric if formed nine stators,
A metal rotor and a spring are provided in a state where the rotor electrode is formed by a drawing process and a spring is passed through the shaft, and the contacts between the stator electrode and the stator terminal are electrically connected, and the metal rotor is arranged to be freely rotatable. The metal rotor and the dielectric are all pressed together by the spring at the upper end tM of the shaft, and the base of the case external drawer of the rotor terminal and stator terminal is bent laterally at t-45° and the case is removed. It is drawn out parallel to the side.

Function: With the above-described configuration, a horizontal adjustment type terminal can be formed by pressing and bending a metal plate after insert molding in a case. By changing the terminal shape and bending shape, it can be used for both normal adjustment type and reverse adjustment type.

EXAMPLES Hereinafter, examples of the present invention will be explained with reference to FIGS. 1 to 6.

Reference numeral 15 designates a t-case formed in the shape of a cylinder with a bottom and made of synthetic resin, with a stepped part 16 formed in the middle of the interior, and an opening at the top.The stator terminal 1T is made of a metal plate.
and rotor terminals 18 are insert-molded on the bottom side with a constant spacing between them. A contact point 19 is provided on the bottom surface of the case 15 at the tip of the stator terminal 17 by bending.

This contact point 19 is formed by pushing upward from the bottom hole 20 of the case 15 after all the stator terminals 17 are insert-molded and then bent. The bottom hole 2o of the case 15 is sealed with a hole cover 21 made of an insulating material by heat welding or the like. Further, a shaft 22 that is integral with the rotor terminal 18 is provided at the other end of the rotor terminal 18 by drawing processing. This shaft 22 is round and hollow inside, and the upper end constriction part 23 is closed. The stator terminal 17 and the rotor terminal 18 are bent horizontally at the base of the external drawer of the case 16 and are drawn out horizontally parallel to the outer circumferential side of the case 15, but the stator terminal 1
7 and the rotor terminal 18 are formed according to the following processing order.

First, as shown in Fig. 2(a), Φ), the contact 19 and the shaft 2
2 is formed into a hoop-shaped metal plate 24, and this metal plate 24 is insert molded into a case 15 made of synthetic resin as shown in FIGS. 3(a) and 3(b).

Next, as shown in ta4 figure (a), the case 16 of the metal plate 24 is
Pressing is performed on the outside of the case 16 to form the tip portions of the stator terminals 17 and rotor terminals 18, and the connection parts 25, 26, 27, 28t of the stator terminals 17 and rotor terminals 18 of the case 16 are cut to remove the case 15. Form.

Next, after bending the stator terminal 1 and rotor terminal 18 upwards in the case 16 as shown in FIG.
), each of the stator terminal 17 and the rotor terminal 18 is bent at 46 degrees and pulled out parallel to the outside of the case 15 along the side surface of the case 15.

The stator 29 has a through hole in the center of the ceramic dielectric, and has a semicircular stator electrode 3o on the lower surface.

The metal rotor 31 is a metal plate with a drawing 9 process, and a semicircular rotor electrode 32 and a dummy electrode are provided on the lower surface, and has a through hole in the center, and an adjustment groove 33 and an adjustment groove 33 on the upper surface, which will be described later. A recess is provided for inserting the spring 34 of
ing. The spring 34 is made of a round leaf spring and has a through hole in the center.

Next, to explain these assemblies, as shown in FIG.
The metal rotor 31 is fitted onto the case 16 so as not to rotate on the lower side, and the metal rotor 31 is rotatably fitted and stacked thereon, and the spring 34 is stacked in the recess of the all-metal rotor 31. The stator 29, the metal rotor 31, and the spring 34 each have a central through hole that penetrates the shaft 22.

Next, the upper end of the shaft 22 is pressed against the upper surface of the spring 34 with a hammer to completely clamp the metal rotor 31 and the starter 29.

In the above configuration, an adjustment driver is fitted into the adjustment groove 33 of the metal a-plate 31, and the metal rotor 31 is rotated fully to change the facing area of the rotor electrode 32 and stator electrode 30 and adjust the capacitance.

In the above explanation, the horizontal adjustment type terminal processing was described, but the metal plate 24 shown in Fig. 2(a) and (b)
Stator terminal 1 after insert molding into case 16
By changing the external shape and bending shape of the rotor terminal 7 and the rotor terminal 18, terminal processing for normal adjustment and reverse adjustment as shown in FIGS. 6A and 6B can be performed.

Effects of the Invention As described above, according to the variable ceramic capacitor of the present invention, there is no need to separately provide a horizontal adjustment type terminal, a positive terminal, and a negative terminal and connect them to the stator terminal and rotor terminal of the capacitor body, as in the conventional case. Horizontal adjustment type terminals can be formed simply by pressing and bending the metal plate after inner molding into the case, and this metal plate can change the terminal shape and bending shape for forward adjustment and reverse adjustment types. Can be used in common only.

Therefore, terminal processing is easy, productivity is excellent, and costs can be reduced.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are a top view and a sectional view showing an embodiment of the variable ceramic capacitor of the present invention, respectively, and FIG.
a) and (b) are top views and cross-sectional views of the metal fittings used in the same capacitor, respectively, and Figures 3 (a) and (b) are the top surface of the case after molding the metal fittings used in the same capacitor, respectively. Fig. 4 is a perspective view showing the processing order of the case used in the capacitor, Fig. 6 is a perspective view of the spring, metal rotor, stator, and case of the capacitor, Fig. 6 (a), (b) ) is a perspective view showing an example of a case used in the same capacitor, FIG. 7 is a perspective view showing a conventional variable ceramic capacitor, FIG. 8 is a sectional view of the same, and FIG.
Figures (a) and Φ) are a cross-sectional view and a bottom view of a terminal plate used in the same capacitor, respectively. 15...Case, 1A...Stator terminal, 18
...Rotor terminal, 19...Contact, 22.
...shaft, 24 ... metal fittings, 29 ... stator, 30 ... stator electric %, 31 ...
・Metal rotor, 32...Rotor electrode, 33...
・Adjustment groove, 34...Spring IJ ring. Fig. 1 15-m-case (16 1st step 17---Stage 2IA child 34-11 Sugu song Fig. 4 Fig. 5 Fig. 6

Claims (1)

[Claims] A cylindrical case with stator terminals and rotor terminals inserted at the bottom and a stepped section in the middle, a dielectric stator with semicircular stator electrodes formed on the bottom surface, and adjustment grooves on the top surface and adjustment grooves on the bottom surface. A metal rotor having semicircular rotor electrodes formed therein is housed, the stator and stator terminals and the rotor and the rotor terminals are electrically connected, and the stator terminals and the case drawer portions of the rotor terminals are bent. A variable ceramic capacitor drawn out perpendicular to the adjustment groove of the rotor.