JPH10241917A - Variable resistor - Google Patents

Abstract

(57) [Problem] To provide a variable resistor used in various electronic devices, which has a low component cost, is easy to assemble, and is inexpensive. A substrate 31 provided with a rectangular parallelepiped core member 33 and a U-shaped film substrate 34 extending from the upper surface of the core member 33 through one side surface to the lower surface thereof is provided. The configuration is such that an inexpensive variable resistor with low cost and small man-hours can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable resistor used for general electronic equipment.

[0002]

2. Description of the Related Art A conventional variable resistor is disclosed in JP-A-2-101.
No. 708 is known.

Hereinafter, a conventional variable resistor will be described with reference to the drawings. FIG. 2 is a perspective view of a substrate which is a main part of a conventional variable resistor.

As shown in FIG. 2, a conventional variable resistor is
Substrate 2 made of a material such as resin having a resistance layer 1 provided on the upper surface
And a SUS 304 rotatably disposed on the substrate 2
A driver plate (not shown) made of metal such as
A metal middle terminal (not shown) pivotally connected to the driver plate and electrically connected to the driver plate; and a metal terminal provided on a side surface of the substrate 2 and electrically connected to the resistance layer 1 of the substrate 2. And an external terminal 3 made of aluminum. The external terminals 3 are provided from the upper surface of the substrate 2 to the lower surface through the side surfaces, and are integrally formed with the substrate 2 by insert molding.

The operation of the conventional variable resistor configured as described above will be described below. The variable resistor is connected to an external circuit by an external terminal 3 connected to the resistance layer 1 and a middle terminal connected to a slider (not shown).
Then, by inserting a driver or the like (not shown) into a notch (not shown) of the driver plate and rotating the driver plate, the resistance value of the middle terminal of the variable resistor can be set to an arbitrary value. .

[0006]

In the above-described conventional variable resistor, the external terminals 3 are provided from the upper surface of the substrate 2 to the lower surface through the side surfaces thereof, and the outer terminals 3 are formed by insert molding with the substrate 2.
Although molded integrally, insert molding has a problem that the cost of the variable resistor increases because the cost of parts is high and the number of steps is large.

An object of the present invention is to provide an inexpensive variable resistor having a low component cost and a small number of steps, which solves the above-mentioned conventional problems.

[0008]

In order to achieve the above object, a variable resistor according to the present invention comprises a rectangular parallelepiped core member and a core member extending from the upper surface of the core member through one side surface to the lower surface. A substrate having a film substrate provided in the shape of a letter, and a resistive layer having a horseshoe shape on the upper surface of the film substrate, and electrically connected to the resistive layer on the upper surface of the film substrate, and at least the core material portion. An external terminal is provided over the side from above.

According to this configuration, an inexpensive variable resistor can be provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, there is provided a substrate having a horseshoe-shaped resistance layer provided on an upper surface thereof, and a slider rotatably disposed on the substrate and slidingly contacting the resistance layer. A variable resistor comprising a driver plate having a moving element, wherein the resistance layer and the slider position can be adjusted by rotating the driver plate with an adjusting jig.
A film having a rectangular parallelepiped core portion and a film substrate provided in a U-shape over the lower surface through one side surface from the upper surface of the core portion, and a substrate provided with a hollow hole at substantially the center, A horseshoe-shaped resistive layer on the upper surface of the substrate and above the core portion, and electrically connected to the resistive layer on the upper surface of the film substrate and provided at least laterally from above the core portion. Since the external terminals are provided, the parts cost is low and the number of steps is small.

A variable resistor according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a variable resistor according to an embodiment of the present invention. In FIG. 1, reference numeral 31 denotes a substrate having a hollow hole 32 substantially in the center, and a core member 33 made of a rectangular parallelepiped resin or metal, and a core member 33 extending from the upper surface of the core member 33 to the lower surface through one side surface. And a film substrate 34 made of a resin such as polyimide provided in a character shape. On the upper surface of the film substrate 34, a resistance layer 35 having a horseshoe shape is provided above the core member 33. Further, on the upper surface of the film substrate 34, there are provided external terminals 36 made of metal such as copper foil from above the core portion 33 through the side and below, and the external terminals 36 are electrically connected to the resistance layer 35. It is connected to the. Reference numeral 37 denotes a driver plate made of metal such as SUS304, which has a through hole 38 at substantially the center and protrudes toward the substrate 31, a slider 40 that slides on the resistance layer 35 on the upper surface of the substrate 31, and Substrate 3
1 and a notch 41 parallel to the notch 41. Reference numeral 42 denotes a metal middle terminal, one end of which is inserted from the lower surface of the substrate 31 into the hollow hole 32 of the substrate 31 and the through hole 38 of the projection 39 of the driver plate 37 and pivotally connects the driver plate 37. Is provided. The other end of the middle terminal 42 has a terminal portion 49 provided from the bottom surface to the side surface of the substrate 31.

An assembling method of the variable resistor according to the embodiment of the present invention configured as described above will be described below.

First, external terminals 36 such as copper foil are formed on the upper surface of a film substrate 34 by etching.

Next, the resistive layer 35 is formed by screen printing so as to be electrically connected to the external terminals 36.

Finally, the cylindrical portion 43 of the middle terminal 42 is
1 is inserted into the hollow hole 32 and the through hole 38 of the driver plate 37 from the lower surface, and the tip of the cylindrical portion 43 is swaged to pivotally connect the driver plate 37.

The operation of the variable resistor constructed and assembled as described above according to the embodiment of the present invention will be described below.

The variable resistor is connected to an external circuit by an external terminal 36 connected to the resistance layer 35 of the substrate 31 and a middle terminal 42 connected to the driver plate 37.
Then, by inserting a screwdriver or the like into the cutout 41 of the driver plate 37 and adjusting it, the driver plate 37 can be rotated, and the resistance value of the variable resistor can be set to an arbitrary value.

[0019]

As described above, the present invention relates to a substrate having a rectangular parallelepiped core and a U-shaped film substrate extending from the upper surface of the core to the lower surface through one side surface to the lower surface. A resistive layer having a horseshoe shape on the upper surface of the film substrate, and external terminals electrically connected to the resistive layer on the upper surface of the film substrate and provided at least laterally from above the core portion. Is provided, so that there is an effect that an inexpensive variable resistor can be provided without increasing the cost of parts and man-hours.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a variable resistor according to an embodiment of the present invention.

FIG. 2 is a perspective view of a substrate which is a main part of a conventional variable resistor.

[Explanation of symbols]

 31, 53 Substrate 32 Hollow hole 33 Core part 34 Film substrate 35, 54 Resistance layer 36, 55 Outer terminal 37 Driver plate 40 Slider 42 Middle terminal

Claims (1)

[Claims] 1. A substrate having a horseshoe-shaped resistance layer provided on an upper surface thereof; and a driver plate rotatably disposed on the substrate and having a slider slidably in contact with the resistance layer. In a variable resistor in which the resistance layer and the slider position can be adjusted by rotating with an adjusting jig, a rectangular parallelepiped core member and an upper surface of the core member pass from one side to the lower surface. A substrate having a U-shaped film substrate and a substrate provided with a hollow hole substantially in the center, a horseshoe-shaped resistive layer on the upper surface of the film substrate and above the core portion, and An external resistor electrically connected to the resistance layer on the upper surface and having an external terminal provided at least laterally from above the core member.