JP3027292U - Fan-shaped variable resistor - Google Patents

Abstract

(57) Abstract: It is an object of the present invention to provide a fan-shaped variable resistor which has a complete dustproof property in a sliding contact portion between a resistor and a contactor and has sufficient reliability and durability. A resistor 3 is provided on a base substrate 1 having a connection terminal 6, the connection terminal 6 and the resistor 3 are printed and connected, and a rotary shaft 2 is installed on the base substrate 1. Rotating shaft 2
The contact lever 4 equipped with the contact 5 for contacting the resistor 3 is attached to the back side in the middle, and the dustproof cover 7 for covering the resistor 3 and the contact lever 4 is rotated on the base substrate 1. The fan-shaped scale plate is installed with the upper part of the shaft 2 exposed, the operating lever 8 is attached to the exposed portion of the rotary shaft 2 outside the dust-proof cover, and the tip of the operating lever 8 is fixed to the base substrate 1. It is made to project from the slit 10 of 9.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a fan-shaped variable resistor, and more particularly to a fan-shaped variable resistor having an excellent dustproof structure.

[0002]

[Prior art]

 The fan-shaped variable resistor generally has a structure as shown in FIG. That is, a pair of arc-shaped resistors 22 are concentrically arranged on the base substrate 21, and one end of an operating lever 23 having a contactor which is in sliding contact with the antibody 22 on the back surface is horizontally rotatable. Attached to. The tip of the operating lever 23 is integrated with the base board 21, and is projected from a slit 25 formed in a horizontal direction in a fan-shaped scale plate 24 fixed to a panel of a device or the like, and is attached to the tip thereof. Attach the knob 26.

The front surface of the fan-shaped scale plate 24 is a curved surface corresponding to the locus of the knob 26 that moves in an arc around the pivot 30 of the actuating lever 23, and indicates the resistance value along the slit 25. The scale 27 and the numbers are displayed. Further, a printed wiring 29 that electrically connects the resistor 22 and the connection terminal 28 is printed on the base substrate 21.

[0004]

[Problems to be solved by the device]

 In the conventional fan-shaped variable resistor described above, since the contact portion between the resistor 22 and the contact is not hidden, dust entering through the slit 25 adheres to and deposits on the contact portion, especially when the frequency of use is low. As a result, a contact failure may occur and the resistor becomes unreliable. Therefore, it is an object of the present invention to provide a fan-shaped variable resistor which has a complete dustproof property in a sliding contact portion between a resistor and a contactor and has sufficient reliability and durability.

[0005]

[Means for Solving the Problems]

 According to the present invention, a resistor is provided on a base substrate having a connection terminal, the connection terminal and the antibody are printed and connected, and a rotary shaft is installed on the base substrate. A contact lever equipped with a contactor for contacting the resistor is attached to the backside of the base, and a dust-proof cover for covering the resistor and the contact lever is exposed on the base substrate to expose the upper part of the rotary shaft. Installed on the outside of the dustproof cover of the rotary shaft, and attach the operating lever to the tip of the operating lever so that it projects from the slit of the fan scale plate fixed to the base board. The above problem has been solved by using a fan-shaped variable resistor composed of

[0006]

[Embodiment of device]

 A preferred embodiment of the present invention will be described with reference to the accompanying drawings (FIGS. 1 and 2). In the figure, reference numeral 1 is a base substrate, and a rotary shaft 2 is installed at one end of the base substrate, and, like the conventional one, is composed of two concentric arc-shaped resistance wires centering on the rotary shaft 2. The body 3 is installed. A contact lever-4 is fixed in the middle of the rotary shaft 2. The contact lever 4 has a contactor 5 on its back surface, which is in sliding contact with the two resistance wires of the resistor 3.

The base board 1 is provided with a connection terminal 6 at an end portion thereof, and although not shown, a printed wiring for electrically connecting the resistor 3 and the connection terminal 6 is printed similarly to the conventional one. Be touched. Reference numeral 7 denotes a dust-proof cover which is placed on the upper surface of the base substrate 1, and is usually made of transparent or semi-transparent plastic. The rotating shaft 2 is rotatable with respect to the dustproof cover 7, and its height is set so that its upper portion projects above the dustproof cover 7. An operating lever 8 is installed on the protruding portion of the rotary shaft 2 above the dustproof cover 7.

Reference numeral 9 is a fan-shaped graduation plate similar to the conventional one, which has a curved front surface and has slits 10 formed in the horizontal direction, along which a graduation 11 for indicating a resistance value and a numeral are provided. Is displayed. The fan-shaped scale plate 9 is integrated with the base substrate 1 and fixed to the panel, wall surface, etc. of the device. The tip of the operating lever 8 is projected from the slit 10, and the knob 12 is attached to the tip. By holding the knob 12 and moving it in the horizontal direction along the slit 10, the operating lever 8 rotates about the rotary shaft 2.

The movement of the operating lever 8 is directly transmitted to the contact lever 4 via the rotary shaft 2, so that the contact lever 4 rotates together with the operating lever 8. As a result, the contact position of the contact 5 with respect to the resistor 3 changes, and the resistance value changes accordingly.

In the resistor according to the present invention, the resistor 3, the contact lever-4 and the contact 5 are arranged in the dustproof cover 7 and are not in contact with the outside air. Therefore, since dust entering the device through the slit 10 does not touch the resistor 3, the contact lever 4 and the contact 5, the dust adhesion does not cause any trouble.

[0011]

[Effect of device]

 The present invention is as described above, and since the sliding contact portion between the resistor and the contact is covered by the dust-proof cover and dust is not attached, the fan-shaped variable resistor is reliable and durable. There is an effect that can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view of an embodiment of the present invention.

FIG. 3 is a perspective view showing a conventional fan-shaped variable resistor.

[Explanation of symbols]

 1 Base Board 2 Rotating Shaft 3 Resistor 4 Contact Lever 5 Contactor 6 Connection Terminal 7 Dust Cover 8 Operation Lever 9 Fan Scale Plate 10 Slit 11 Scale 12 Picking

Claims (1)

[Scope of utility model registration request] 1. A resistor is provided on a base substrate having a connecting terminal, the connecting terminal and the resistor are printed and connected, and a rotary shaft is installed on the base substrate. A contact lever provided with a contactor on the back surface that contacts the resistor.
A dustproof cover for covering the resistor and the contact lever is installed on the base substrate with the upper part of the rotary shaft exposed, and an operating lever is provided on an exposed portion of the rotary shaft outside the dustproof cover. -, And attach the operating lever tip to the base.
A fan-shaped variable resistor formed by protruding from a slit of a fan-shaped scale plate fixed to the substrate.