JPH01218005A - Electronic mechanism parts - Google Patents

Abstract

PURPOSE:To improve the characteristics of load resistance upon adjustment of the title parts by preventing a metallic leaf from being deteriorated by interposing the metallic leaf and a resilient member between a driver plate and a rotor to absorb a load exerted on the driver plate. CONSTITUTION:A metallic leaf 20 and a resilient member 25 are interposed between a driver plate 15 and a rotor 10. A capacitor is adjusted by rotating the plate 15 by keeping the tip end of a driver inserted from a sheet 30 into the plate 15 and engaged with the plate 15. Herein, a load exerted on the plate 15 is applied not only to the leaf 20 but to a member 25. The member 25 assists spring force by the leaf 20 to absorb an excess load when the excess load is applied to the plate 15. Hereby, the leaf 20 is prevented from being deteriorated owing to stress concentration. Thus, load-resistance characteristics upon adjustment can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of electronic mechanical parts, such as trimmer capacitors, variable resistors, low-return switches, and the like.

Conventionally, as a trimmer capacitor, a dielectric substrate, a rotor, and a driver plate that rotates integrally with the rotor are housed in a case, and the rotor is rotated through the opening of the case and via the driver plate. A device with adjustable capacitance is known. In this device, a metallic spring plate is interposed between the rotor and the driver plate in order to ensure contact stability between the dielectric substrate and the rotor and to obtain rotational torque.

However, in the trimmer capacitor described above, if an overload is applied to the driver plate and the bar plate when the driver is inserted into the driver plate and rotated, the spring properties of the spring plate deteriorate. Rotational torque becomes unstable or zero,
The problem is that the trimmer function is lost.

In particular, in this type of trimmer capacitor, a resin sheet is usually attached to the opening of the case to ensure sealing during soldering and flux cleaning.

Therefore, it is difficult to insert the screwdriver; for example, during adjustment with a screwdriver, the screwdriver often hits the driver plate once and then fits into the groove of the driver plate, causing the driver plate to rotate.

In this case, if the tip of the driver hits the shaft in the groove of the driver plate, there is no problem even if an overload is applied. Join the spring plate,
The above-mentioned problems become noticeable.

SUMMARY OF THE INVENTION An object of the present invention is to prevent deterioration of the spring plate due to overload from a driver in an electronic mechanical component incorporating a rotation mechanism, and thereby to stabilize rotation torque and trimmer function.

Means for Solving the Problems In order to solve the above problems, the electronic mechanical component according to the present invention is characterized in that a metallic spring plate and an elastic member are interposed between the driver plate and the rotor. and,
Preferably, the elastic member is assembled in a more compressed state than the metal spring plate.

In the structure described above, the load applied to the driver plate from the driver is absorbed not only by the metal spring plate but also by the elastic member, thereby eliminating stress concentration on the spring plate. That is, the elastic member has a function of assisting the spring force of the spring plate, and prevents the spring plate from deteriorating. In particular, if the elastic member is assembled in a state where it is more compressed than the metal spring plate, the overload will be mainly stopped by the elastic member, and deterioration of the metal spring plate will be reliably prevented.

Embodiments Hereinafter, embodiments of electronic mechanical components according to the present invention will be described with reference to the accompanying drawings. In this embodiment, the present invention is applied to a trimmer capacitor.

[First embodiment, see FIG. 1] In FIG. 1, 1 is a case made of heat-resistant resin; 2;
3 is a terminal insert-molded inside this case. 5 is a dielectric substrate serving as a stator, and 10 is a rotor made of a conductive metal material.

The rotor 10 is rotatable about the shaft portion 3a of the terminal 3 as a fulcrum. Arc-shaped electrodes centered on the shaft portion 3a are provided on the back surface of the dielectric substrate 5 and the back surface of the rotor 10, and since the facing area of these electrodes changes as the rotor 10 rotates, the capacitance increases. be adjusted.

Furthermore, 15 is a driver plate made of a conductive metal material, and 20 is a spring plate made of a conductive metal material. This spring plate 20 is caulked and fixed to the driver plate 15, and is also rotatable integrally with the rotor 10. By caulking the head of the shaft portion 3a of the terminal 3, the driver plate 15 can rotate about the shaft portion 3a as a fulcrum, and with this rotation, the rotor 10 also rotates integrally via the spring plate 20.

25 is a ring-shaped elastic member made of silicone rubber, and is attached to the driver plate 15, especially its caulked portion, and the rotor 10.
is interposed between. This elastic member 25 is a spring plate 2
It is installed in a more compressed state than 0.

A heat-resistant resin sheet 30 is pasted to the upper opening of the case 1 to seal the inside of the case 1 and protect the internal rotating mechanism from blanks and washing water.

In the above configuration, after mounting on the circuit board, in order to adjust the capacity, insert the tip of the driver into the driver plate 15 from above the seat 30 and rotate the driver plate 15 while engaging the driver plate 15. With this, the spring plate 202 elastic member 25. The rotor 10 rotates integrally, and the capacity is adjusted. At this time, the load applied to the driver plate 15 acts not only on the spring plate 20 but also on the elastic member 25. The elastic member 25 assists the spring force of the spring plate 20, absorbs the overload when an overload is applied to the driver plate 15, and prevents the spring plate 20 from deteriorating due to stress concentration.

[Second embodiment, see FIG. 2] This second embodiment basically has the same configuration as the first embodiment, except that the elastic member 25 is replaced by a substantially cylindrical elastic member. 27 to driver plate 15 and rotor 10
It is located at a point interposed between the spring plate 20 and the spring plate 20 disposed above. This elastic member 27 is made of silicone rubber, for example, and is integrated with the driver plate 15 by, for example, outsert molding, and is incorporated in a state that is more compressed than the spring plate 20. Note that the other members are the same as those shown in the first embodiment, are given the same reference numerals, and the explanation thereof will be omitted.

The operation 9 is also similar to the first embodiment, but in this second embodiment, the elastic member 27 is further provided integrally with the driver plate 15, so the number of parts is reduced and the assembly cost is reduced. This will be reduced.

[Third Embodiment, see FIG. 3] This third embodiment basically has the same structure as the first embodiment, except that the spring plate 2 made of a conductive metal material
1 is formed into a flat ring shape, and an elastic member 26 made of a conductive rubber material is integrated into the spring plate 21 by outsert molding.

Therefore, the driver plate 15 is pressed against the upper surface of the rotor 10 via the spring plate 21 and the elastic member 26, and these members rotate together. Note that the other members are the same as those shown in the first embodiment, are given the same reference numerals, and the explanation thereof will be omitted.

The operation 2 is also similar to the first embodiment, but in this third embodiment, the elastic member 26 is further provided integrally with the spring plate 21, so that the parts are similar to the second embodiment. The number of points is reduced, and assembly costs are reduced.

[Other Examples] Note that the electronic mechanical component according to the present invention is not limited to the above embodiments, and can be variously modified within the scope of the gist.

For example, in the first embodiment, an elastic resin material such as silicone rubber may be applied onto the rotor 10 in place of the elastic member 25, which is an independent member.

In addition to the trimmer capacitor, it can be widely applied to variable resistors, low-return switches, etc., as long as the rotation mechanism is housed in the case and the characteristics are adjusted by the driver plate.

λ Background Example As is clear from the above explanation, according to the present invention, since the metallic spring plate and the elastic member are interposed between the driver plate and the rotor, the elastic member absorbs the spring force of the spring plate. This assists and absorbs the load applied to the driver plate, preventing deterioration of the spring plate. Therefore, the load-bearing characteristics during adjustment are improved, and the rotational torque or trimmer function can be stabilized. In particular, if the elastic member is assembled in a state where it is more compressed than the spring plate, the overload will be mainly absorbed by the elastic member, and the deterioration of the spring plate will be more reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a first embodiment of the invention, FIG. 2 is a vertical sectional view showing a second embodiment of the invention, and FIG. 3 is a vertical sectional view showing a third embodiment of the invention. It is. DESCRIPTION OF SYMBOLS 1... Case, 2, 3... Terminal, 5... Dielectric substrate (stator), 10... Rotor, 15... Driver plate, 20.21... Spring plate, 25.26 ．．
27... Elastic member, 30... Sealing sheet. Patent applicant Murata Manufacturing Co., Ltd.

Claims (2)

[Claims] (1) An electronic mechanical component that houses a stator, a rotor, and a driver plate that rotates together with the rotor in a case, and allows the rotor to rotate through the opening of the case and through the driver plate, the driver plate and the driver plate being rotatable through the driver plate. An electronic mechanical component characterized by interposing a metal spring plate and an elastic member between the rotor and the rotor. (2) The electronic mechanism component according to claim (1), wherein the elastic member is assembled in a more compressed state than the metal spring plate.