JPH0284709A - Electronic mechanism element - Google Patents

Abstract

PURPOSE:To prevent deterioration in the torque of a rotor even when the temperature of the rotor rises by solder dipping, reflow solder, etc., when the rotor is packaged in a printed circuit board by providing a dropping-off preventing section having a specific shape at the front end section of the supporting shaft of a rotor terminal. CONSTITUTION:A rotor terminal 2 which is made of a metallic plate and molded to a resin-made base plate 1 in such a state where a cylindrical supporting shaft 2a is pushed out on one side and the supporting shaft can protrude nearly perpendicularly from the surface of the base plate 1, to which the rotor 4 and stator are fitted, is provided in an electronic mechanism element, with the rotating mechanism section including the rotor 4 and stator of the part being fitted to the base plate 1. The front end section of the supporting shaft 2a of the rotor terminal 2 is formed to a dropping- off preventing section 2b for the rotor 4 in such a way that the section is bent inward in the radial direction after the section is depressed by force applied in the axial direction and bent outward in the radial direction. In case of a trimmer capacitor, for example, the rotating mechanism section is constituted of a dielectric body 5 provided with semicircular electrode conductors 9 on the lower surface, the rotor 4, and a rotor keeping plate 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic mechanical component, and more particularly to an electronic mechanical component such as a trimmer capacitor, a variable resistor, or a low-return switch that has a rotating mechanism including a rotor and a stator.

Conventionally, in electronic mechanical components such as trimmer capacitors in which a rotating mechanism including a rotor and a stator is attached to a resin substrate, the tip end surface of a shaft with a head is connected in the axial direction of the shaft, although not specifically shown. A caulking recess with a thin peripheral wall is provided by digging with a drill or the like, and the opening periphery of the caulking recess is deformed outward into a curl shape, so that the rotor is rotatably attached to the stator and the resin substrate. I was doing it.

Electronic mechanical components such as those described above are usually soldered to a printed circuit board using techniques such as solder dip and flow soldering.

By the way, when soldering is performed using solder dip or flow soldering, the entire electronic mechanical component becomes high temperature, and the caulking part of the caulking recess, which has a thin peripheral edge, deforms and loosens due to thermal expansion, causing a problem that the rotor torque deteriorates. there were.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic mechanical component that does not cause rotor torque deterioration even when the electronic component is heated to high temperatures due to solder dips, reflow soldering, etc. when mounted on a printed circuit board or the like.

For this reason, the present invention provides an electronic mechanical component in which a rotating mechanism including a rotor and a stator is attached to a resin substrate, which is made of a metal plate, and has a cylindrical support shaft extruded from one side, and which rotates the rotor of the resin substrate. and a rotor terminal molded on the resin substrate so that the support shaft protrudes almost perpendicularly to the mounting surface of the stator, and the support shaft of the rotor terminal has a distal end that receives a force in the axial direction. It is characterized by having a retaining portion of the rotor that is pressed and crushed, deformed once radially outward, and then deformed in a radially inwardly folded state.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

An embodiment in which the present invention is applied to a trimmer capacitor is shown in FIGS. 1 and 2.

In FIGS. 1 and 2, a case 1 to which a rotation mechanism section, which will be described later, is attached is integrally molded with a rotor terminal 2 and a stator terminal 3, which are connected to the rotation mechanism section.

The rotor terminal 2 is made of a metal with good electrical conductivity, such as cylindrical metal, and has a cylindrical support shaft 2a protruding from one side thereof by a method such as drawing or extrusion. The rotor terminal 2 is molded onto the case 1 so that the rotor 4 and dielectric 5 of the case 1 are attached so that the support shaft 2a is substantially perpendicular to the surface 1a.

The resin of case 1 is a heat-resistant thermosetting resin that can withstand temperatures of about 300°C.

The case 1 is formed with a recess 7 for accommodating the rotation mechanism.

The rotation mechanism section includes, in order from the bottom in FIG. 2, a dielectric 5, a rotor 4, and a rotor holding plate 8. A semicircular electrode conductor 9 is formed on the lower surface of the dielectric 5.
is electrically connected to one end of the stator terminal 3.

A rotor 4 made of a metal material is placed on the upper surface of the dielectric 5. A semicircular electrode conductor 4a is also formed on the lower surface of the rotor 4. The rotor terminal 2 is located at the axial center of the rotor 4.
A through hole 4b is formed through which the support shaft 2a is inserted, and an engagement recess 4C for the cut and raised pieces 8a of the rotor press plate 8, which will be described below, is provided on the upper surface of the rotor 4.

The rotor holding plate 8 is formed by molding a metal disk (not shown) made of an elastic metal material such as phosphor bronze as follows. That is, the rotor pressing plate 8 is
A part of the member between the vicinity of the center and the peripheral edge of the metal disk is cut and raised downward, and the cut-and-raised piece 8a is inclined diagonally downward.

8a is formed. Then, the vicinity of the center of the metal disk is pushed out from the one surface toward the other surface to form the supporting portion 8b such as the cut and raised pieces 8a, 8a.

The rotor press plate 8 has a hole 8C at its center, through which the support shaft 2a of the rotor terminal 2 is inserted.

Incidentally, after the cut-and-raised pieces 8a8a and the like of the rotor press plate 8 are cut and raised, a slot 8d for fitting a blade of a driver (not shown) is formed.

As shown in FIG.
The rotor holding plate 8 is placed on the engagement recess 4c.
The cut and raised pieces 8a, 8a, etc. are inserted. Further, the support shaft 2a of the rotor terminal 2 is inserted through the through hole 4b of the rotor 4 and the hole 8c of the rotor presser plate 8. Then, a large force is applied to the tip of the support shaft 2a in the axial direction by a riveting machine (not shown) such as a gyro type or an auto punch type, and the tip of the support shaft 2a is once deformed radially outward. Thereafter, a retaining portion 2b of the rotor 4 is formed by being folded back radially inward.

Thereby, the rotor 4 is attached to the case 1 so as to be rotatable together with the rotor press plate 8.

The rotor 4 has cut and raised pieces 8a and 8 of the rotor press plate 8.
Since the tip portions such as a press the bottom of the engagement recess 4C, they are urged toward the dielectric 5.

The capacitance of the trimmer capacitor having the above configuration is extracted from between the rotor terminal 2 and the stator terminal 3.

The magnitude of the capacitance is determined by the overlapping area of the electrode conductor 4a formed on the lower surface of the rotor 4 and the electrode conductor 9 formed on the lower surface of the dielectric 5. With this overlapping area, when the rotor press plate 8 is rotated, the rotor 4 also rotates, and therefore, the above-mentioned capacitance changes.

With such a configuration, as described above, the rotor terminal 2
A large force is applied to the tip of the support shaft 2a formed in the axial direction by a riveting machine (not shown) such as a gyro type or an auto-punch type. As can be seen, the retaining portion 2b of the rotor 4 that is once deformed radially outward and then folded back radially inwardly protrudes radially outwardly at the tip of the support shaft 2a. The flesh pressure of the body increases. Therefore, the rigidity of the retaining portion 2b of the rotor 4 of the support shaft 2a is increased, and there is almost no deterioration of torque of the rotor even due to thermal expansion due to solder dip or flow.

In the above embodiment, the tip of the support shaft 2a formed on the rotor terminal 2 may be perforated, as shown in FIG. 3.・Also, in the above example,
The case 1 may be a simple resin substrate made of insulating resin, as shown in FIGS. 4 and 5.

Next, an embodiment in which the present invention is applied to a variable resistor is shown in FIGS. 6 and 7.

The embodiment shown in FIGS. 6 and 7 differs from the embodiment described with reference to FIGS. 1 and 2 in the structure of the rotating mechanism and in the number and connection of terminals. This is because the embodiments shown in FIGS. 6 and 7 are variable resistors, and the embodiments shown in FIGS. 1 and 2 are trimmer capacitors. Therefore, the characteristic structure of the present invention is exactly the same as the embodiment shown in FIGS. 1 and 2, and the same effects can be achieved. The explanation will be omitted.

In the embodiment shown in FIGS. 6 and 7, a rotor terminal 2 and stator terminals 3a, 3b are molded in a rectangular parallelepiped case 1 made of heat-resistant resin. The rotation mechanism section is composed of a resistor 11, a slider 12, and a slider rotation fitting 13 in order from the bottom in FIG. It is installed in exactly the same manner as shown in Figure 2.

In each of the above embodiments, the rotor terminal 2, stator terminals 3a, 3b, etc. are molded in the case 1,
Next, after each rotation mechanism is installed, the tip of the support shaft 2a is caulked. Therefore, only the rotation mechanism is different, and the relationships among the case 1, rotor terminal 2, stator terminals 3a, 3b, etc. are the same.

The present invention can be widely applied to electronic mechanical parts such as rotary switches in addition to the above-mentioned trimmer capacitors and variable resistors.

As is clear from the detailed description above, the present invention
In an electronic mechanical component in which a rotating mechanism part is attached to a resin board, a cylindrical support shaft is protruded from one side of a rotor terminal that is molded on a resin mounting board together with a stator terminal,
The tip of the support shaft is crushed by applying force in the axial direction to deform it radially outward, and then folded back radially inward. The flesh pressure of the retaining part of the rotor that protrudes outward increases, and the rigidity of the retaining part of the rotor on the support shaft becomes high (so that even thermal expansion due to solder dips and flow etc.
Rotor torque deterioration is almost eliminated.

Further, according to the present invention, the torque mechanism that causes the rotor to rotate when a torque of a predetermined value or more is applied is an independent spring member, and the rotor terminal is provided with a spring portion to function as the torque mechanism. It is not necessary to provide the rotor terminals, and the rotor terminals can be molded together with the stator terminals on the resin substrate.

[Brief explanation of the drawing]

1 is a plan view of a trimmer capacitor to which the present invention is applied; FIG. 2 is a sectional view taken along the line ■-■ of FIG. 1; FIG. 3 is a vertical sectional view of a modification of the trimmer capacitor shown in FIG. 1; The figure is a plan view of another trimmer capacitor to which the present invention is applied, Figure 5 is a sectional view taken along the line IV-TV in Figure 4, Figure 6 is a plan view of a variable resistor to which the present invention is applied, and Figure 7 is Vl in Figure 6
-VI line sectional view. l...Case (resin board), 2...Rotor terminal,
2a... Support shaft, 2b... Retaining portion, 4... Rotor, 5... Dielectric, 6... Resin, 11... Resistor, 12... Slider.

Claims (1)

[Claims] (1) In an electronic mechanical component in which a rotating mechanism including a rotor and a stator is attached to a resin substrate, a cylindrical support shaft is extruded from one side of the metal plate, and the rotor and stator are attached to the resin substrate. A rotor terminal is provided which is molded on the resin substrate so that the support shaft protrudes almost perpendicularly to the surface, and the tip of the support shaft of the rotor terminal is pushed when force is applied in the axial direction. An electronic mechanical component characterized in that the rotor has a retaining portion that is crushed, deformed radially outward, and then folded back radially inward.