JPH09266106A - Variable resistor - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To improve adjustability of a variable resistor used in various electric devices. A driver plate (26) has a slider (29) slidably contacting a resistor (23) and a projecting portion (27) substantially at the center, a driver groove (31) is provided on the upper portion, and the length of the driver groove (31) is the protruding portion of the driver plate. The inner circumference of the upper end of 27 is less than or equal to
It has a structure that allows it to be inserted deeply into the body and does not come off easily.

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 in general electronic equipment.

[0002]

2. Description of the Related Art A conventional variable resistor is disclosed in Jpn.
The one disclosed in the microfilm of 6736 (Jitsukai Sho 61-114805) is known.

A conventional variable resistor will be described below with reference to the drawings. FIG. 4 is a cross-sectional view of a conventional variable resistor, and FIG. 5 is a cross-sectional view showing a state in which a driver is inserted in a driver groove, which is the main part of the variable resistor. In the figure, reference numeral 1 denotes a rectangular parallelepiped substrate made of an insulating material such as ceramic having a circular hollow hole 2. Reference numeral 3 is a horseshoe-shaped resistor provided on the upper surface of the substrate 1. 4 has a protrusion 5 that abuts on the upper surface of the substrate 1, a through hole 6 having substantially the same shape as the hollow hole 2 of the substrate 1, and a slider 7 having one end electrically connected to the resistor 3. The other end is a driver plate having a driver groove 9 which is parallel to the substrate 1 and which is connected by the connecting portion 8. Reference numeral 10 denotes a metal middle terminal having a substantially cylindrical cylindrical portion 11 protruding from the lower surface of the substrate 1 to the upper surface thereof and having a third terminal 12 provided from the lower surface of the substrate 1 to the side surface thereof. The cylindrical portion 11 of the middle terminal 10 has the hollow hole 2 of the substrate 1.
Also, it is caulked by inserting it through the through hole 6 of the driver plate 4. At this time, the middle terminal 10 is electrically connected to the slider 7 of the driver plate 4.

The operation of the variable resistor thus constructed is connected to an external circuit by the terminal portion (not shown) of the resistor 3 and the third terminal 12 of the middle terminal 10 connected to the driver plate 4. Then, by inserting an adjusting screwdriver or the like into the driver groove 9 of the driver plate 4 and rotating it, an arbitrary resistance value can be set.

[0005]

However, in the above-mentioned conventional configuration, since the projecting portion 5 of the driver plate 4 and the driver groove 9 are overlapped with each other in a close contact state, the projecting portion of the driver plate 4 is directly below the driver groove 9. Since the outer peripheral flat surface portion 13 of 5 is exposed and the substantial depth of the driver groove 9 can be secured only by the thickness of the driver groove 9 of the driver plate 4, the adjustment driver 14 is easily removed and the adjustment work is difficult. Had challenges.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a variable resistor in which the adjusting driver is unlikely to come off and whose reliability is improved.

[0007]

In order to achieve the above-mentioned object, the present invention provides a structure in which the length of a driver groove for adjusting a slider is equal to or less than the inner diameter of a protruding portion of a driver plate. It was done.

According to the present invention, it is possible to obtain a highly reliable variable resistor in which the adjusting driver is unlikely to come off.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention has a substrate having a hollow hole substantially in the center and a projection having a through hole projecting toward the substrate, and the upper surface of the substrate. A driver plate having a slider that slides on the resistor and having a driver groove parallel to the substrate, and one end of the driver plate inserted from a lower surface of the substrate into a hollow hole of the substrate to fit the driver plate. The other end includes a middle terminal protruding outward, one end electrically connected to a resistor of the substrate and the other end provided along a side surface of the substrate and a lower surface of the substrate. By making the length of the groove equal to or less than the inner diameter of the upper end of the protruding part, the depth of inserting the driver into the driver groove is not about the thickness of the upper part of the driver plate but to the caulking part of the middle terminal. Become Those having an effect that is not such driver for adjustment easily adjust difficult however.

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

FIG. 1 is a sectional view of a variable resistor according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, and FIG. 3 is a sectional view showing a state in which a driver is inserted into a driver groove which is a main part of the variable resistor. is there.

In the figure, reference numeral 21 designates a circular hollow hole 2 approximately in the center.
It is a rectangular parallelepiped-shaped substrate made of an insulating material such as ceramic having 2. Reference numeral 23 is a horseshoe-shaped resistor provided on the upper surface of the substrate 21. Reference numerals 24 and 25 denote first and second terminals that are electrically connected to the resistor 23 and the upper surface of the substrate 21, respectively, and are provided along the lower surface and the side surface of the substrate 21. 26 has a protrusion 27 that abuts on the upper surface of the substrate 21,
A through hole 28 having substantially the same shape as the hollow hole 22 of the substrate 21,
One end has a slider 29 electrically connected to the resistor 23, and the other end is a driver plate provided with a driver groove 31 connected by a connecting portion 30 and parallel to the substrate 21. 32
Is a metal middle terminal having a substantially cylindrical cylindrical portion 33 protruding from the lower surface to the upper surface and having a third terminal 35 having the same shape as the side surface from the lower surface of the substrate 21. This middle terminal 32
The cylindrical portion 33 is to be inserted into the hollow hole 22 of the substrate 21 and the through hole 28 of the driver plate 26 and caulked. At this time, the middle terminal 32 is the driver plate 26.
Is electrically connected to the slider 29. 34 is the middle terminal 32
It is a sealing material that seals the inside of the cylindrical portion 33. In the above configuration, the driver groove 3 provided in the driver plate 26
The length of 1 is equal to or less than the inner diameter of the upper end of the protrusion 27. Therefore, the adjusting driver 41 can be inserted deeply into the caulked portion between the cylindrical portion 33 of the middle terminal 32 and the projecting portion 27 of the driver plate 26, and the adjusting driver 41 and the driver groove 31 can be reliably fixed, so that the adjusting driver 41 becomes difficult to come off.

The assembling method of the variable resistor having the above-described structure according to the embodiment of the present invention will be described below.

The sealing material 34 is press-fitted and fixed to the inner periphery of the cylindrical portion 33 of the middle terminal 32 in advance, the cylindrical portion 33 of the middle terminal 32 and the hollow hole 22 of the substrate 21 are fitted to each other, and the cylindrical portion 33 is formed. The tip of the driver plate 26 is inserted into the through hole 28 of the driver plate 26, the tip of the cylindrical portion 33 is caulked, and the driver plate 26 is rotatably supported on the substrate 21. At this time,
The slider 29 of the driver plate 26 is arranged at a position in contact with the resistor 23 of the substrate 21.

The operation of the variable resistor having the above-described structure according to the embodiment of the present invention will be described below. The first and second terminals 24 and 25 of the resistor 23 and the terminal 35 of the middle terminal 32 that is connected to the driver plate 26 are connected to an external circuit, and the driver 41 for adjustment is provided in the driver groove 31 of the driver plate 26. By inserting and rotating, it is possible to set an arbitrary resistance value.

[0016]

As described above, according to the present invention, the length of the driver groove of the driver plate is set to be equal to or less than the inner diameter of the upper end portion of the protruding portion, so that the space for inserting the adjusting driver is wide. In addition, since the adjustment driver can be inserted deeply, the adjustment driver is less likely to come off, and a variable resistor having improved workability during adjustment can be provided.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a cross-sectional view showing a state in which a driver is inserted into a driver groove which is a main part of the same.

FIG. 4 is a sectional view of a conventional variable resistor.

FIG. 5 is a cross-sectional view showing a state where a driver is inserted in a driver groove, which is the main part of the same.

[Explanation of symbols]

 21 Substrate 23 Resistor 26 Driver Plate 27 Projection 29 Slider 31 Driver Groove 32 Middle Terminal

Claims (1)

[Claims] 1. A substrate having a hollow hole at substantially the center thereof, and a slider having a through hole projecting toward the substrate and having a slider sliding on a resistor on the upper surface of the substrate, and A driver plate having a driver groove parallel to the substrate, one end inserted from the lower surface of the substrate into a hollow hole of the substrate and fitted with the driver plate, and the other end protruding outwardly, and one end The other end of the driver plate is electrically connected to the resistor of the substrate and the other end thereof is provided along the lower surface of the substrate, and the length of the driver groove of the driver plate is the inner diameter of the upper end of the protruding portion. A variable resistor that is equal to or less than.