JPS61131511A - Variable type electronic component - 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 variable electronic components used for regulating electrical circuits.

Conventional configurations and their problems In recent years, there has been a demand for variable electronic components that are small and highly reliable, along with the trend toward high-density packaging of electronic components.

Hereinafter, a conventional variable electronic component will be described with reference to the drawings.

FIG. 1 and FIG. 2 are a top view and a vertical cross-sectional view, respectively, showing a variable resistor as an example of a variable electronic component. In Figures 1 and 2, 1 is a substrate made of an insulating material with a through hole 1a in the center.
A central electrode 3 is formed extending from the periphery of the through hole 1a on one main surface of the substrate 1 to one end of the substrate 1, and a horseshoe-shaped resistor film 2 is further formed around the central electrode 3.
is formed. A conductive washer 4 is placed on the central electrode 3.
is placed on the washer 4, and a conductive slider 6 is placed on the washer 4. A through hole 6C is provided in the center of the slider 5, a press arm 6b having spring properties is provided to surround the center, and the resistor film on the substrate 1 is provided at the tip of the press arm 6b. A contact that presses against 2! 5. A is provided. Reference numeral 6 denotes a conductive rotating shaft, which is provided on the other main surface side of the substrate 1, passing through the through hole 6C of the slider 6, the washer 4, and the through hole 1a of the substrate 1. A caulked portion 6b is formed in the recessed portion 1b, and is provided so as to be rotatable relative to the substrate 1. Here, the rotating shaft 6 and the slider 6 are provided so as to rotate together, and an operating groove 6a is formed at one end of the rotating shaft 6.

The operation of the variable resistor configured as above will be described below.

First, by fitting a jig such as a screwdriver into the operating groove 6a of the rotating shaft 6 and rotating the rotating shaft 6, the slider 6 that rotates together with the rotating shaft 6 is rotated. The desired resistance value can be obtained by adjusting the resistance value.

However, the configuration described above does not have a dust-proof structure, so it is easily affected by dirt, dust, and the flux used during soldering, and has the disadvantage that the soldering methods are limited. Was.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides a variable electronic component that is not only dust-proof but also less susceptible to the effects of flux used during soldering.

Structure of the Invention In order to achieve this object, the variable electronic component of the present invention has the following features:
A part of a center plate having a center hole is inserted, and an inner peripheral wall having an inner peripheral surface concentric with the center hole is formed on one side of the center plate, and an opening is formed on the other side. A case made of an insulating material formed integrally with a plate, and a shaft head having a diameter equal to or smaller than the inner diameter of the inner circumferential wall of the case, which penetrates the center hole of the center plate and cannot be detached from the center plate. and a movably disposed shaft, a grease-like insulator is disposed between the shaft head of the shaft and the inner circumferential wall of the case, and the substrate is connected to the opening of the case. This configuration provides a dust-proof structure, and a grease-like insulator between the shaft and the case allows flux, etc. used during soldering to be sealed. This means that it is difficult for the liquid to penetrate.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a longitudinal sectional view showing an embodiment in which the variable electronic component of the present invention is adopted as a variable resistor. FIG. 4 is a longitudinal sectional view of the shaft of FIG. 3 before assembly. FIG. 5 is a longitudinal cross-sectional view showing the central plate, lead-out terminal, and case integrally formed before assembly in FIG. 3.

6A and 6B are a top view and a front view of the substrate of FIG. 3, respectively. In Figures 3 to 6, 10 is a center hole of 1 oa.
11 is a lead-out terminal having a contact portion 11a provided to be in contact with the lead-out electrode 18;
2 inserts a part of the center plate 10 and a part of the lead-out terminal 11, and is formed into an i-body with the center plate 10 and the lead-out terminal 11, and the center plate 10 is inserted into one side 1ob of the center plate 1o. Inner peripheral wall 1 having an inner peripheral surface concentric with hole 10 a
2a is formed, and an opening 12b is formed on the other side IQa. Reference numeral 14 denotes a shaft having a shaft head 14b having a diameter equal to or less than the inner diameter of the inner circumferential wall 12a of the case 12, and a small diameter portion 14a inserted through the center hole 10a of the center plate 1o. Here, a grease-like insulator 13 is arranged between the shaft head 14b of the shaft 14 and the inner circumferential wall 12a of the case 12, and the shaft end of the shaft head 14b is used for operation. A groove 14a is formed, a slider 16 made of a conductive material having spring properties is attached so as to engage and rotate with the small diameter portion 140, and the shaft end of the small diameter portion 14c is caulked. A caulked portion -14d is formed. One side of the slider 16 is in contact with the center plate 1o, and the other side is formed with a contact point 15a that presses against the resistor film 17. Reference numeral 16 denotes a substrate made of an insulating material, and on the main surface thereof is formed the horseshoe-shaped resistor film 17 whose both ends are connected to the lead electrodes 18, respectively.

Here, the resistor film 17 and the contact 15a of the slider 15 are in contact with the substrate 16, the contact portion 11a of the lead terminal 11 is in contact with the lead electrode 18, and the opening of the case 12 is in contact with the base plate 16. 12b are combined so as to be sealed, the case 12 and the substrate 16 are temporarily fixed using an appropriate temporary fixing means, which is omitted in this embodiment, and the case 12 and the substrate 1θ are further fixed together. An adhesive 19 such as epoxy 7 type adhesive is applied to seal the gap and ensure secure fixation. After the fixing is completed, the center plate 1o and the lead-out terminals 11 protruding from the case 12 are bent as appropriate to form the bent center plate 10' and lead-out terminals 11'.

The operation of the variable resistor according to the present invention configured as above will be described below.

First, when a jig such as a screwdriver is engaged with the operating groove 14a provided in the shaft head 14b of the shaft 14 and the shaft 14 is rotated, the shaft 14 is rotated. The contacts 16 & of the slider 15 that are attached to the resistor 15 slide on the resistor film 17 to obtain a desired resistance value.

As described above, according to this embodiment, a dust-proof structure is achieved, and the grease-like insulator 13 is disposed between the shaft head 14b of the shaft 14 and the inner circumferential wall 12a of the case 12. , the flux used during soldering is applied to the inner peripheral wall 12a of the case 12 and the case 1.
It is possible to make it difficult to enter between the shaft 14 and the shaft 14, which is provided so as to rotate with respect to the shaft 14.

In addition, although the variable resistor was shown as an example in the above embodiment,
It goes without saying that the present invention can be similarly applied to variable capacitors, switches, etc.

Effects of the Invention As described above, the present invention includes inserting a part of a center plate having a center hole, an inner wall having an inner circumferential surface concentric with the center hole on one side of the center plate, and an inner wall having an inner circumferential surface concentric with the center hole on the other side. a case made of an insulating material integrally formed with the center plate in which an opening is formed; and a shaft head having a diameter equal to or smaller than the inner diameter of the inner circumferential wall of the case, and passing through the center hole of the center plate. and a shaft that is non-removably and movably disposed with respect to the center plate, and a grease-like insulator is provided between the shaft head of the shaft and the inner circumferential wall of the case. Needless to say, by arranging the circuit board so as to seal the opening of the case, it becomes a dust-proof structure. Dip soldering can prevent infiltration from between the case and the fixed case, and by appropriately selecting the material of each component, the main body of the variable electronic component is immersed in a molten solder bath for soldering. It is also possible to use the ``-1'' method, which has great practical effects.

[Brief explanation of drawings]

Figures 1 and 2 are a top view and a longitudinal cross-sectional view, respectively, showing a conventional variable electronic component using a variable resistor as an example, and Figure 3 is an embodiment in which the variable electronic component of the present invention is adopted as a variable resistor. FIG. 4 is a longitudinal sectional view showing an example of the shaft before assembly in FIG. 3, and FIG. 5 is a longitudinal sectional view of the shaft in FIG. The vertical sectional view shown in FIGS. 6A and 6B are a top view and a front view of the substrate of FIG. 3, respectively. 1o...Central plate, 1o&...Central hole, 1
ob...One side of the center plate 1o, 11...
Output terminal, 12... Case, 12 &...
・Inner peripheral wall, 12b...opening, 13...
Grease-like insulator, 14...shaft, 14b...
...Shaft head, 16...Slider, 16a...
. . . Contact of slider 16, 16 . . . Substrate, 17
...Resistor film. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 4 Figure f4a.

Claims (2)

[Claims] (1) A part of a center plate having a center hole is inserted, an inner peripheral wall having an inner peripheral surface concentric with the center hole is formed on one side of the center plate, and an opening is formed on the other side. a case made of an insulating material integrally formed with the central plate; a shaft head having a diameter equal to or less than the inner diameter of the inner circumferential wall of the case; a shaft that is movably disposed so that it cannot fall off, a grease-like insulator is disposed between the shaft head of the shaft and the inner circumferential wall of the case, and the substrate is attached to the case. A variable electronic component, characterized in that the variable electronic component is arranged so as to seal the opening. (2) A slider made of a springy conductive material and having one side in contact with the conductive center plate and the other side having a contact point in pressure contact with the resistor film formed on one main surface of the substrate is connected to the shaft. The variable electronic component according to claim 1, characterized in that the variable electronic component is arranged so as to rotate together.