JPH02281603A - Variable resistor - Google Patents

Abstract

PURPOSE:To prevent a contact failure in a variable resistor by a method wherein the resistor is formed into a constitution, wherein a spacer provided with a major hole, through which a resistance layer and a conductive layer are exposed, is provided on an insulating substrate formed with the resistance layer and the conductive layer and a slider, which presses part of a conductor to bridge electrically these layers through the major hole and at the same time, is held in a freely slidable design, is provided. CONSTITUTION:A resistance layer 2 and a conductive layer 3 are provided on the upper surface of an insulating substrate 1, a major hole 6 is provided in the center of a spacer 5 of insulating resin make in such a way that the layers 2 and 3 are exposed, a conductor 7 is formed into an external shape almost identical with that of the spacer 5 and a conductive film 20 is applied on the center of the lower surface of the conductor 7. A press spring 14 has the major hole 16 in such a way that a lever 9 of a slider 8 can be operated in a freely slidable design and a spring group, the slider 8, the conductor 7, the spacer 5 and the substrate 1 are inserted between the spring 14 and a base frame 11 in such a way that the slider 8 is always suppressed on the conductor 7. A press part 10 pf the slider 8 pushes the conductor 7. Thereby, the layers 2 and 3 are bridged by a conductive film 20.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a variable resistor used in consumer audio equipment and the like.

BACKGROUND OF THE INVENTION Conventionally, this type of variable resistor has, for example, a 6th. As shown in FIG. 7, it has a resistance layer 51 and a conductive layer 52, and the resistance layer 5
1 and the conductive layer 52, respectively, an insulating substrate 53 holding a terminal 54, and a metal brush 55 that slides on both layers in order to bridge the resistive layer 51 and the conductive layer 52. , a slider 56 made of insulating resin on the lower surface, and a cover 58 having a long hole 59 through which a lever portion 57 of the slider 56 can protrude. In this case, by operating the lever part 57 of the slider 56, the metal brush 55 bridges and slides on the resistance layer 51 and the conductive layer 52, thereby adjusting the resistance value to a predetermined value. There is.

Problems to be Solved by the Invention As mentioned above, in the conventional variable resistor, since the metal brush 55 slides on the resistance layer 51 and the conductive layer 52, the brush 55
Also, abrasion powder of the resistive layer 51 and the conductive layer 52 is generated, and the abrasion powder becomes an insulator due to oxidation, etc., and when the brush 55 slides, contact becomes unstable and causes noise.

An object of the present invention is to eliminate the above-mentioned conventional problems and provide a variable resistor free from poor contact.

Means for Solving the Problems In order to solve the above problems, the present invention provides a base frame, an insulating substrate mounted on the base frame and having at least a resistive layer and a conductive layer formed on one surface thereof, and the insulating substrate. a spacer having a long hole through which a resistive layer and a conductive layer formed in the spacer are exposed; a conductor having a conductive film that electrically bridges the resistive layer and the conductive layer through the long hole of the spacer; It is composed of a slider that presses a part of the body and is slidably held.

Function In the present invention, since a conductor having a conductive film is used,
As the slider slides, the conductive film is pressed, and the resistance layer formed on the insulating substrate and the conductive layer are electrically bridged, and the resistance value is adjusted.

At this time, since the resistive layer and the conductive layer are not abraded by a brush as in the conventional case, there is no contact failure due to abrasion powder.

Example 1 to 3 show the structure of a first embodiment of the present invention.

Reference numeral 1 denotes an insulating substrate, which is made of an elongated rectangular film made of insulating resin, and has a resistive layer 2 and a conductive layer 3 on its upper surface, and a conductive path 4 from each end to an end surface 19 of the film.
has been extended.

Reference numeral 5 denotes a spacer made of insulating resin, which has a long hole 6 in the center so that the resistive layer 2 and the conductive layer 3 are exposed, and has a slight thickness.

A conductor 7 is made of an insulating resin film and has approximately the same external shape as the spacer 5, and a conductive film 20 having approximately the same external shape as the elongated hole 6 of the spacer 5 is coated at the center of the lower surface.

Reference numeral 8 is a slider having an operating lever 9 on the upper side and a holding part 10 on the lower side.

Reference numeral 11 denotes a base frame made of a thin metal plate, and has claws 13 for mounting positioning and holes 12 for screw mounting.

14 is a presser spring, which is made of a thin and highly springy metal plate.
A long hole 16 is provided so that the lever 9 of the slider 8 can be slidably operated. Furthermore, this presser spring 14 always presses the slider 8 against the conductor 7, and connects the spring section, slider 8, conductor 7, spacer 5, and insulating substrate 1 between the presser spring 14 and the base frame 11. It has a caulking part 15 for being inserted between them.

In the above configuration, in this embodiment, the holding spring 14 always presses the conductor 7 side. Slider 8
The holding part 10 presses the conductor 7, and thereby the resistance layer 2
and conductive layer 3 are bridged by a conductive film 20. The tip of the holding portion 10 has an acute angle so that the contact surfaces of the conductor 7 with the resistance layer 2 and the conductive layer 3 are in line contact perpendicular to the sliding direction.

Then, press the lever 9 of the slider 8 and hold the elongated hole 1 of the spring 14.
6, the position of the previous line contact moves, which also moves the position where the resistive layer 2 and conductive layer 3 are bridged by the conductor 7, and the desired resistance value is obtained. It will be done.

Furthermore, by sandwiching the end portion 19 of the insulating substrate 1 between connectors, connection to the circuit to be used can be made.

In addition, the resistive layer 2, the conductive layer 3, and the conductive film 20 are placed facing each other with a spacer 5 in between, and are surrounded by the spacer 5, and are sealed from the outside, so that no dust or the like can enter.
From this point of view as well, there is no contact failure.

As shown in FIGS. 4 and 5, the second embodiment is an example in which a cylindrical body 28 is provided in place of the slider 8 of the first embodiment, and the small cylindrical portion 28b of the cylindrical body 28 is By constantly pressing with the spring portion 17 of the presser spring 14, the large cylindrical portion 28a is always pressed against the conductor 7, and a portion of the conductive film 2o bridges the resistive layer 2 and the conductive layer 3. The cylindrical body 28 is rolled and moved to vary the resistance value.Also, a spherical body may be used instead of the cylindrical body 28.

Effects of the Invention Since the present invention differs from the conventional method in which the brush is made to slide, there is no generation of abrasion powder due to abrasion of the contact portions, and therefore there is no contact failure.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of the first embodiment of the invention, FIG. 2 is a front sectional view of the first embodiment of the invention, and FIG. 3 is an exploded perspective view of the first embodiment of the invention. , FIG. 4 is a perspective view of the second embodiment of the present invention, FIG. 5 is an exploded perspective view of the second embodiment of the present invention, FIG. 6 is a side sectional view of the conventional example, and FIG. 7 is the conventional example. FIG. 3 is an exploded perspective view of an example. 1... Insulating substrate, 2... Resistance layer, 3.
... Conductive layer, 4... Conductive path, 5...
... Spacer, 6 ... Long hole, 7 ... Conductor, 8 ... Slider, 9 ... ... Shi/
<-10... Holding part, 11... Base frame, 12... Screw mounting hole, 13...
...Tlaw, 14...Press spring, 15...
・・・Caulking part, 16... Long hole, 17...
...Spring part, 20... Conductive film.

Claims (1)

[Claims] a base frame; an insulating substrate mounted on the base frame and having at least a resistive layer and a conductive layer formed on one surface; and a long hole provided in the insulating substrate through which the resistive layer and the conductive layer are exposed. a spacer, a conductor having a conductive film that electrically bridges a resistive layer and a conductive layer through a long hole in the spacer, and a conductor that presses a part of the conductor and is held slidably. A variable resistor consisting of a slider.