JPS6032725Y2 - variable resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable resistor, and more particularly to a variable resistor with an improved resistor terminal extraction section.

Conventionally, this type of variable resistor has a structure in which a horseshoe-shaped resistance film 2 is formed on an insulating substrate 1, and a slider contact 3 slides on the surface of the horseshoe-shaped resistance film 2, as shown in FIG.

On the other hand, the first and third terminal conductor films 4 are formed on both ends of the resistive film 2 . A third lead wire 5 is connected, and a second lead wire 7 is further connected to a second terminal conductor film 6 that is electrically connected to the slider contact 3.

Variable resistors with the conventional structure described above have drawbacks such as the difficulty of miniaturizing the components and the inability to increase packaging density, as well as the occurrence of connection failures at the connection points between the insulating substrate and the lead wires. there were.

Further, for miniaturization, a variable resistor in which a conductive film is extended from one side of the substrate to the other side via the side surface instead of the lead wire 5 has been proposed in Japanese Utility Model Application Publication No. 10293/1983.

However, the conductive film that passes through the side surface of the substrate is directly exposed on the side surface, and is easily affected by external forces, which has the disadvantage that accidents such as breakage at corners are likely to occur.

An object of the present invention is to provide a variable resistor that is highly reliable and can be miniaturized.

According to the present invention, both terminals of the resistive film and terminals of the slider are connected from one side of the insulating substrate having at least two protrusions on one side through between the protrusions on the side surface having the protrusions and on both sides. There is obtained a variable resistor characterized in that the resistor is provided so as to extend to the other surface.

Hereinafter, the present invention will be explained in detail based on FIGS. 2 to 5.

2 to 5 show examples of the present invention, in which a horseshoe-shaped resistive film 2 made of, for example, ruthenium or molybdenum is deposited in a thin film form on an insulating substrate 1 made of Bakelite, ceramic, etc. The slider contact 3 is attached by connecting studs 9 through the first . The third terminal part conductor film 40 and the second terminal part conductor film 60, which is formed along the periphery of the through hole 10 formed in the substantially central part of the insulating substrate 1, are attached to the insulating substrate 1.
It is characterized in that an external connection terminal is extended to the back surface between the two protrusions 11 and 12 on the side surface and through both sides.

Another advantage is that the conductive film 40.60 is located below the protruding surface of the protrusion 11.12.

1st. Third terminal conductor film 40 and second terminal conductor film 6
0 is mainly printed and baked using silver thread paste material, and can be connected and fixed to the external circuit by soldering or conductive adhesive, etc., and can be changed by rotating the slider contact. Used as a resistor.

Methods for forming the conductor film 40.60 on the side surface of the insulating substrate 1 include a dipping method and a coating method. It is most suitable for mass production to use the so-called through-hole technique, in which a through-hole 102 is provided in advance at a corresponding location, a conductive paste is printed, and a film is then formed on the back side of the insulating substrate or the side surface by vacuum suction.

As explained above, according to the present invention, the conventional lead wire portion can be omitted, making it easier to downsize and improving reliability.

Furthermore, it has the advantage of being suitable for mass production, such as being able to process multiple board boards at the same time.

Furthermore, the corner portions on the side surfaces of the conductive film are provided with protrusions 11,
12, it is less directly affected by external force, and accidents such as wire breakage can be prevented, resulting in a highly reliable small variable resistor.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional variable resistor, FIG. 2 is a plan view illustrating an implementation of the present invention, FIG. 3 is a sectional view of FIG. 2, and FIG. 4 is a bottom view of FIG. FIG. 5 is a backside of FIG. 2, and FIG. 6 is a plan view showing a multi-chip insulating substrate. 1...Insulating substrate, 2...Resistive film, 3
......Slider contact, 4, 40...1st.
Third terminal conductor film, 5...1st. 31st J-do wire, 6, 60... Second terminal conductor film, 7...
...Second lead wire, end...Washer, 9...
・Connection stud, 10...Through hole, 11, 12...
···protrusion.

Claims (1)

[Scope of utility model registration request] In a variable resistor in which a slider contact is attached to an insulating substrate having a resistive film on its surface, one side of the insulating substrate has at least two protrusions connected to both ends of the resistive film. The terminal conductor film electrically connected to the slider contact is extended to the back surface through between and through both sides of the protrusions on the side surface of the insulating substrate. A variable resistor characterized in that the conductive film is below the protrusion surface.