JPH041688Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a slide type variable resistor used in various electronic devices such as radio receivers and television receivers.

Conventional configuration and its problems In conventional slide type variable resistors, the resistor and terminal were fixed by caulking through the mounting case, so there was always a gap between the mounting case and the terminal. .

In recent years, printed circuit boards have been widely used to increase the efficiency of assembly man-hours for sets such as radio receivers and television receivers, and the connection of sliding variable resistors to electronic circuits is also accomplished by inserting terminals into the printed circuit board and passing them into solder baths. This is usually done by date ping.

However, the flux used in this solder dip penetrates into the interior through the gap between the terminal and the mounting case and adheres to the surface of the resistor, causing problems such as generation of sliding noise.

Purpose of the Invention It is an object of the present invention to provide a sliding variable resistor that eliminates the above-mentioned conventional drawbacks and prevents floating between the insulating substrate and the mounting case.

Structure of the Invention In order to achieve this object, the slide type variable resistor of the invention includes an insulating substrate having a parallel resistance path and a conductive path on its surface, and a circuit board connected to each of the resistance path and the conductive path. a slider for slidingly contacting the resistance path and the electrode section on the conductive path; and the insulating substrate, with one end of the outer terminal protruding to the outside, and at least on the sliding trajectory of the slider. a mounting case in which the insulating substrate is integrally molded so as to cover the top; a slider that is slidably placed on the mounting case and has the slider attached to its bottom; and a lever protruding from the slider. The cover has an elongated hole on its upper surface for guiding the slider, and the slider is housed in a housing formed by the mounting case attached to the opening on the lower surface. According to this configuration, since the outer terminal is buried in the mounting case and one end thereof protrudes outside, there is no gap between the mounting case and the outer terminal, which prevents flux during soldering. The influx will be prevented. Further, by covering the insulating substrate and integrating the periphery of the insulating substrate with the mounting case, it is possible to prevent the insulating substrate from floating.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.
This will be explained with figures. In the figure, 1 is an insulating substrate having a resistance path 4 having electrodes 2 and 3 at both ends, and a conductive path 5 arranged in parallel with the resistance path 4, 6, 7, and 8.
are outer terminals fixed to the ends of the electrode parts 2, 3 and the conductive path 5 by caulking or the like, respectively; 9 is a mounting case formed integrally with the insulating substrate 1 so as to cover the upper part of the periphery thereof; Above outer terminals 6, 7, 8
One end of each is molded to protrude outward. 10 is a slider comprising a lever 11 slidably placed on the mounting case 9;
12 is a metal cover having a long hole 13 in the center of the upper surface for guiding the lever 11;
The lower opening of the slider 2 is attached to the mounting case 9 by bending the mounting legs 14, and the slider 10 is slidably housed in a housing composed of the mounting case 9 and the cover 12. .

A sliding plate 15 is inserted through the lever 11 together with a friction plate 16 and a slide spring 17, and is housed in the housing. Reference numeral 18 denotes a slider attached to the lower surface side of the slider 10. This slider 18 bridges the resistance path 4, the electrode sections 2 and 3, and the conductive path 5, and the sliding of the slider 10 reduces the resistance The path 4 is in sliding contact with the electrode paths 2 and 3 and the conductive path 5.

The mounting case 9 is integrally molded with the insulating substrate 1 so that there is no portion of the mounting case 9 covering the insulating substrate 1 on the sliding locus of the slider 18. Further, if a small residual resistance value (minimum resistance value when the slider 10 is located at both left and right ends) is not required, the electrode parts 2 and 3 may be omitted. It is not necessary to cover the entire surrounding area with the mounting case 9, and it is sufficient to cover only a part of it, and these are of course within the scope of the present invention.

Effects of the Invention As described above, the slide type variable resistor of the present invention is constructed in such a way that the outer terminal is buried inside the mounting case and one end of the resistor protrudes outside. There is no gap between the outer terminals, preventing soldering flux from flowing into the interior, which is effective in suppressing sliding noise. In addition, since the mounting case is molded to cover the top of the insulating board, the insulating board does not lift up from the mounting case due to differences in expansion and contraction between the insulating board and the mounting case due to heat and moisture, and the variable resistor This makes it possible to stabilize the characteristics.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an insulating substrate to which terminals are fixed, showing an embodiment of the sliding variable resistor according to the present invention, Fig. 2 is a perspective view of a mounting case molded integrally with the insulating substrate, and Fig. 3 FIG. 4 is an exploded perspective view showing one embodiment of the sliding type variable resistor according to the present invention. 1... Insulating board, 4... Resistance path, 5... Conductive path, 6, 7, 8... Outer terminal, 9... Mounting case,
10...Slider, 11...Lever, 12...
Cover, 13...long hole, 18...slider.

Claims (1)

[Scope of utility model registration request] an insulating substrate having a resistor and a conductive path arranged in parallel on its surface; an outer terminal connected to each of the resistive path and the conductive path; a slider that slides on the resistive path and the conductive path; a mounting case having one end of the outer terminal protruding to the outside and integrally molded to cover the insulating board except for the sliding locus of the slider of the insulating board; and a mounting case that slides on the mounting case. The slider is mounted such that the slider can be mounted on the slider and the slider is attached to the bottom surface of the slider, and the mounting case has a long hole on the upper surface for guiding the lever protruding from the slider and is attached to the opening on the lower surface. A slide type variable resistor comprising a cover that houses the above-mentioned slider in a housing.