JPH0612744B2 - Electronic mechanism parts - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electronic mechanism part including a variable capacitor, a variable resistor, a variable coil, and the like, and particularly to a lead-out structure for a terminal in a chip-type electronic mechanism part. Related to the improvement of.

[Summary of the Invention] In the present invention, in the electronic mechanism component, the terminals on the rotor side and the stator side are made of metal plates,
While these terminals are embedded in the bottom wall of the resin case, a protrusion protruding downward is formed by plastic working at the portion where the terminal is located in the bottom wall, and the lower surface of the protrusion is the bottom surface of the resin case. It is necessary to bend the terminals along the outer surface of the resin case in order to obtain the electronic mechanism component in the form of a chip so that the rotor-side terminal electrodes and the stator-side terminal electrodes that are exposed from the outside and are connected to the outside are configured. Is to lose.

[Prior Art] FIG. 8 and FIG. 9 show an electronic mechanism part of a conventional chip mode, focusing only on a resin case and a terminal. In particular, FIG. 8 shows a part of the resin case. It is a front view which fractures | ruptures and is shown and FIG. 9 is a partially broken bottom view.

As shown in FIG. 8, a so-called resin mold type electronic mechanism in which the terminal 1 of the electronic mechanism component is embedded in the bottom wall 3 of the resin case 2 and the mechanical holding of the terminal 1 is achieved by the resin case 2. Parts are proposed.

In the electronic mechanism part having such a structure, the resin case 2
Is molded with the terminal 1 extending in the lateral direction, as shown by the dotted line in FIG. Then, in order to obtain the chip mode,
The terminal 1 is cut to an appropriate length and then bent,
It is fitted into the groove 4 formed on the bottom surface of the resin case 2.
At this time, the surface of the terminal 1 that faces downward mainly constitutes a terminal electrode that connects to the outside.

[Problems to be Solved by the Invention] In the electronic mechanism component having the above-described structure, the following problems are encountered in connection with bending of the terminal 1.

First, when such an electronic mechanical component is thinned, the wall thickness A of the bent portion of the terminal 1 is also reduced, and the resin of the resin case 2 cannot withstand the bending of the terminal 1 and is destroyed. It may happen. Therefore, it becomes very difficult to reduce the thickness of the electronic mechanism part.

In addition, a step for bending the terminal 1 is required, which causes an increase in the number of steps and a need for a terminal forming machine,
In addition, the overall cost is increased due to a high probability of producing defects.

Therefore, the present invention is intended to provide an electronic mechanism component that eliminates the step of bending the terminal after it is embedded in a resin case and can eliminate the inconvenience caused by the bending of the terminal.

[Means for Solving the Problems] In the present invention, the rotor side element and the stator side element are housed in a resin case having a bottom wall, and the rotor side element is rotated with respect to the stator side element. An electronic mechanism component having a structure in which an electric characteristic brought between is variable and the electric characteristic is drawn out of a resin case through a rotor-side terminal and a stator-side terminal, and the problem is as follows. Will be resolved to.

Each of the rotor-side terminal and the stator-side terminal is made of a metal plate and extends from the inside of the resin case while being embedded in the bottom wall of the resin case. In this state, the rotor-side and stator-side terminals are provided with protrusions formed so as to project downward by plastic working at the portions located inside the bottom wall. Then, the lower surface of this protruding portion is exposed from the bottom surface of the resin case to achieve connection with the outside,
The rotor side terminal electrode and the stator side terminal electrode are configured.

[Operation] In the present invention, the rotor-side terminal electrode and the stator-side terminal electrode, which are connected to the outside, can be created in advance by plastic working when manufacturing the rotor-side and stator-side terminals. The step of bending after the side and stator side terminals are embedded is unnecessary.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. The embodiments described here show the case where the present invention is applied to a variable capacitor, and more specifically to a trimmer capacitor in a chip form.

1 and 2 show a trimmer capacitor as an embodiment of the present invention. FIG. 1 is a sectional view taken along the line I--I in FIG. 2 and FIG. It is a figure.

The trimmer capacitor 10 shown here is provided with a resin case 11, and this resin case 11 has a bottom wall 12 with its upper surface being an opening. Such a resin case 1
The rotor-side element and the stator-side element are housed in the unit 1.

The rotor-side element includes a metal rotor 13 and a spring 14. Further, as the stator side element, a dielectric plate 15 made of, for example, ceramic is provided.

These rotor-side and stator-side elements are provided so as to surround the central shaft 16 provided in the resin case 11. The central shaft 16 is composed of a cylindrical portion 18 formed by drawing a part of a rotor-side terminal 17, which will be described later, and a resin integrated with the resin case 11 filled therein. The dielectric plate 15 is first placed on the bottom of the resin case 11. The dielectric plate 15 is prevented from rotating by engaging with the inner peripheral surface of the resin case 11. The metal rotor 13 is placed on the dielectric plate 15. The metal rotor 13 can rotate around the central axis 16. Above the metal rotor 13 is a spring 1
4 is placed and engaged with a part of the metal rotor 13 so as to rotate integrally with the metal rotor 13. After the spring 14 is inserted into the resin case 11, a caulking portion 19 is formed on the upper end portion of the central shaft 16, so that the spring 14 acts so that the metal rotor 13 is strongly pressed against the dielectric plate 15. It becomes a state.

On the lower surface of the dielectric plate 15, a stator electrode (not shown) is formed, for example, in a semicircular shape or a fan shape. On the other hand, the rotor electrode 20 is formed on the lower surface of the metal rotor 13 with a step having a planar shape of, for example, a semicircle or a fan. An electrostatic capacitance is formed according to the area where the rotor electrode 20 and the stator electrode face each other through the dielectric plate 15, and the electrostatic capacitance is generated by the metal rotor 1.
It is made variable by rotating 3.

The above-mentioned capacitance is drawn out of the resin case 11 by the rotor side terminal 17 and the stator side terminal 21 of which only a part is shown in FIG. That is, the rotor side terminal 17
Is in contact with the metal rotor 13 via the cylindrical portion 18 and the spring 14. The stator-side terminal 21 is in contact with a stator electrode (not shown) of the dielectric plate 15 via the elastic piece 22.

The rotor-side terminal 17 and the stator-side terminal 21 are inserted into a mold when the resin case 11 is molded, and are held by the resin case 11 when the resin case 11 is molded. While describing such a molding process, the configurations of the resin case 11, the rotor-side terminal 17, and the stator-side terminal 21 and their relationships will be described with reference to FIGS. 3 to 6.

FIG. 3 is a perspective view of the metal plate material forming the rotor-side terminal 17 and the stator-side terminal 21, and shows the positional relationship of the rotor-side terminal 17 and the stator-side terminal 21 in the mold, The positional relationship within the resin case 11 is shown.

The rotor-side terminal 17 and the stator-side terminal 21 are formed in a plurality of sets along the length direction of one hoop material with the arrangement shown in the figure. Done. Rotor side terminal 1
7 is a connecting portion 23, 2 when punched from a hoop material.
Held by 4,25. On the other hand, the stator side terminal 2
1 is held by the connecting portion 26. Rotor side terminal 1
7 is provided with the above-mentioned cylindrical portion 18, and is provided with a flat surface portion 27 which is partially embedded in the bottom wall 12 of the resin case 11. The flat surface portion 27 is stretched downward by drawing. The protruding portion 28 is formed so as to extend. On the other hand, the above-mentioned elastic piece 2 is attached to the stator side terminal 21.
2 is formed with a part of the bent piece 29. Further, the stator-side terminal 21 is provided with a flat surface portion 30 part of which is embedded in the bottom wall 12 of the resin case 11, and the flat surface portion 30 is formed with a protruding portion 31 so as to project downward by drawing. It

FIGS. 4 to 6 show a state where the rotor side terminal 17 and the stator side terminal 21 are inserted into the mold with the arrangement shown in FIG. 3 and the resin case 11 is molded. FIG. 4 is a plan view, and FIG. 5 is a line V- in FIG.
FIG. 6 is a sectional view taken along line V, and FIG. 6 is a bottom view.

The rotor-side terminal 17 and the stator-side terminal 21 come into contact with some protrusions provided on the mold, and are properly positioned in the mold. The concave portions formed as a result of the presence of such protruding portions are numbered 32 to 32 in FIGS.
It is shown at 38.

When the molding of the resin case 11 is completed, the rotor side terminal 17
The lower surface of the projecting portion 28 and the lower surface of the projecting portion 31 of the stator-side terminal 21 are exposed from the bottom surface of the resin case 11, respectively, and there, the rotor-side terminal electrode 39 and the stator-side terminal electrode are connected to the outside. Make up 40. As shown in FIGS. 5 and 6, it is preferable that the protrusions 28 and 31 are configured to be exposed also on the outer side surface of the resin case 11. This is because, when such a trimmer capacitor 10 is soldered on an appropriate circuit board, it is more reliable to achieve soldering by extending to the outer surface of the resin case 11 and forming the terminals. is there.

The connecting portions 23, 24, 25 shown in FIGS.
Finally, 26 is cut so as to be substantially flush with the outer surface of the resin case 11. The state after the connecting portion 25 is cut is shown in FIG.

The plastic working for forming the rotor-side terminal electrode 39 or the stator-side terminal electrode 40 is performed as in the above-described embodiment.
It is not limited to drawing. For example, bending processing as shown in FIG. 7 can also be applied.

FIG. 7 is a perspective view showing a part of the stator side terminal 21a, for example. The flat portion 30 of the stator-side terminal 21a
A tongue piece formed by cutting is provided on a, and the protruding portion 31 is formed by bending the tongue piece so as to project downward.
a is formed. The stator side terminal electrode 40a is formed on the lower surface of the protrusion 31a.

Although not particularly shown, the protruding portion of the rotor-side terminal may also have the structure shown in FIG.

In the illustrated embodiment, the rotor-side terminal electrode 39 and the stator-side terminal electrode 40 are flush with the bottom surface of the resin case 11, but they may slightly project from the bottom surface.

Although a variable capacitor has been described as an example of the electronic mechanism part to which the present invention is applied, the same configuration has the same configuration as that of the variable resistor and the variable resistor in which the rotor side element and the stator side element are also housed in the resin case. It can also be applied to coils and the like.

[Advantages of the Invention] As described above, according to the present invention, the rotor-side and stator-side terminals are formed with the protruding portions projecting downward, and these are arranged so as to be exposed from the bottom surface of the resin case. Therefore, it is not necessary to form the rotor-side and stator-side terminal electrodes by bending a part of the terminals after molding the resin case, and the rotor-side terminal electrode and the stator-side terminal electrode can be configured as they are. be able to. Further, as described above, since it is not necessary to bend the terminals after molding the resin case, the wall thickness of the bottom wall of the resin case can be reduced, and the size of the component can be reduced. At the same time, it can be expected that the number of processes, the number of facilities, and the occurrence of defects will be reduced.

[Brief description of drawings]

1 and 2 show a trimmer capacitor as an embodiment of the present invention, and FIG. 1 is a line I- of FIG.
FIG. 2 is a sectional view taken along I, and FIG. 2 is a plan view. FIG. 3 is a perspective view showing a metal plate material forming the rotor-side terminal 17 and the stator-side terminal 21 included in FIG. 4 to 6 show a resin case 1 molded with the rotor side terminal 17 and the stator side terminal 21 embedded therein.
4 is a plan view and FIG. 5 is a plan view of FIG.
FIG. 5 is a sectional view taken along the line V-V in the figure, and FIG. 6 is a bottom view. FIG. 7 is a perspective view showing a modified example of the protruding portion 31a formed on the stator side terminal 21a. FIG. 8 and FIG. 9 are views for explaining the conventional technique.
The drawing is a partially cutaway front view, and FIG. 9 is a partially broken bottom view. In the figure, 10 is a trimmer capacitor, 11 is a resin case, 12 is a bottom wall, 13 is a metal rotor (rotor side element), 14 is a spring (rotor side element),
Reference numeral 15 is a dielectric plate (stator-side element), 16 is a central axis, 17 is a rotor-side terminal, 21 and 21a are stator-side terminals, 28, 31, and 31a are protrusions, 39 is a rotor-side terminal electrode, and 40 and 40a are This is a stator-side terminal electrode.

Claims (1)

[Claims] 1. A rotor-side element and a stator-side element are housed in a resin case having a bottom wall, and the electrical characteristics brought between the rotor-side element and the stator-side element are varied by rotating the rotor-side element with respect to the stator-side element. In the electronic mechanism component, the electrical characteristics are drawn out of the resin case through the rotor-side terminal and the stator-side terminal, wherein the rotor-side and stator-side terminals are each formed of a metal plate, and The protrusion extends from the inside of the resin case in a state of being embedded in the bottom wall of the resin case, and the portion located in the bottom wall is provided with a protrusion formed so as to project downward by plastic working, and the lower surface of the protrusion is A special feature is to configure the rotor-side terminal electrode and the stator-side terminal electrode that are exposed from the bottom surface of the resin case and connect to the outside. Electronic mechanism parts to be collected.