JPH0629685Y2 - Potentiometer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a potentiometer, and more particularly to a rotary potentiometer used at high frequency.

[Prior Art] Conventionally, a variable resistor including a slider that slides while maintaining contact with a surface of a resistor forming a variable resistor is well known. For example, in "Adjuster for Resistance or Inductance" of Japanese Utility Model Publication No. 26-12442, a structure in which a spring is provided on a slider is proposed. Also, the actual public 4
In the "Sliding type variable resistor" which becomes 8-11627, and in the "Sliding type variable resistor" which becomes JP-B-50-19146, the surface of the resistor is provided by providing the linearly displaced slider. Although a small-sized slide-type variable resistor that guarantees the pressing force against the slider has been proposed, no provision has been made to provide a vibration-proof body that prevents the vibration generated in the slider.

On the other hand, a rotary potentiometer that converts a mechanical rotation displacement into an electrical resistance variation is a little different from the slide variable resistor described above that converts a straight displacement into an electrical variation. Although they are different, they function substantially in the same electrical manner. The rotary potentiometer, which requires particularly high precision, is configured with various measures for converting the rotational displacement amount into an accurate resistance value variation amount.

One configuration row of such a conventional rotary potentiometer will be described below with reference to the drawings.

FIG. 2 is an exploded perspective view showing a conventional rotary potentiometer with its waist part broken.

In FIG. 2, the first bearing 6 shown by a chain line is press-fitted into the center of the bottom surface 1C of the main body 1 made of aluminum material that is machined with high precision into the shape of a hat as shown in the figure. ,
A second bearing 8 shown by a chain line is press-fitted into the central portion of the lid body 2 which serves as a lid of the main body 1, and the shaft body 5 is rotatable by the first bearing 6 and the second bearing 8. It is configured to pivot.

Further, a convex portion 1A as shown in the drawing is formed by lathe processing or the like on the edge portion near the upper end of the main body 1. This convex portion 1A
After inserting the shaft body 5 into the second bearing 8 of the lid body 2 in order to rotatably support the shaft body 5, the outer surface of the lid body 2 is aligned with the upper end of the main body 1. After that, the retaining ring 3 serves as a hook when tightening.

For this reason, the retaining ring 3 is machined into a valley 3A and a screw hole 3B after shearing an aluminum extruded material having a substantially C-shaped cross-sectional shape as shown in the figure to a predetermined thickness. The screw 9 is provided as shown in the figure, and the screw 9
As the inner diameter of the retaining ring 3 is reduced by tightening, the lid 2 and the convex portion 1A of the main body 1 are tightened.

Next, a resistor layer 11 is formed on the inner surface of the wheel body 10 made of an electrically insulating material such as resin and having a high roundness. As shown in the figure, the ring body 10 has the center of rotation of the ring body 5 and the ring body 1
After being aligned so that the center of 0 matches exactly, it is fixed to the inside of the main body 1 using an adhesive or the like.

Here, the resistor layer 11 is not formed over the entire inner surface of the ring body 10 but is formed so as to have both end portions, and the right lead electrode 15A is formed at the right end portion in the figure.
However, the left lead electrodes 14A are respectively connected to the left end portions in the figure.

On the other hand, the side wall of the body 1 is provided with three holes 1B for inserting the three collars 12 made of an insulating material as shown in the drawing, and the holes formed in the three collars 12 are formed. A first electrode 13 and a second electrode 14, which are provided by being press-fitted inside, respectively.
The third electrode 15 and the third electrode 15 are held in an electrically insulated state with respect to the main body 1.

Then, the above-mentioned right lead electrode 15A is the third electrode 15,
Further, the left lead electrodes 14A are connected to the second electrodes 14, respectively, and thus the resistor layer 11 is configured so that the resistance value can be detected outside the main body 1.

On the other hand, a lead electrode 13A is connected to the first electrode 13 so that a pair of brushes 16 described later can be electrically taken out of the main body 1.

A brush wheel body 18 is electrically insulated from the rotatable shaft body 5 via an upper insulator 17 and a lower insulator 19.
Is fixed, while a bracket 20 is provided below the brush wheel body 18 so as to be in electrical contact therewith. A slider 21 is fixed to the tip portion 20A of the bracket 20 by spot welding or the like,
The slider 21 having a plurality of divided distal end portions 21A in the shape of the hands of the grandchild is adapted to slide in contact with the resistor layer 11 by the action of its own elastic force. .

On the other hand, the pair of brushes 16 urged in the closed state by the elastic force come into contact with and slide on the valley portion 18A of the brush wheel body 18. That is, the slider 21 is configured to be electrically taken out of the main body 1 via the first electrode 13.

Therefore, if one side is connected to the first electrode 13 and the other side is connected to either the second electrode 14 or the third electrode 15, the rotation displacement amount in the shaft body 5 changes in the resistance value of the resistor layer 11. It can be detected as a quantity.

[Problems to be solved by the present invention] However, since the conventional potentiometer is configured as described above, when the shaft 5 is rotated, that is, when the potentiometer is operated, the brush and the slider are separated from each other. As a result of the occurrence of minute vibrations due to sliding friction and the like, there is a problem that the brush and the slider are damaged early and the durability as a potentiometer is shortened.

Therefore, the potentiometer of the present invention has been made in view of the above problems, and its purpose is to suppress the minute vibration generated in the brush and the slider during the operation of the potentiometer. Therefore, the durability of the brush and the slider is ensured for a long period of time, and a potentiometer having improved durability is provided.

[Means for Solving the Problems] In order to solve the above-mentioned problems and achieve the object, the potentiometer according to the present invention has the following configuration, that is, is provided at the center of the bottom surface of the body of the hat-shaped body. A shaft body that is rotatably supported by a bearing and a bearing provided at the center of a lid body that serves as a lid of the main body, a brush wheel body that is provided in an electrically insulated state with respect to the shaft body, and the main body. A brush which is provided in an electrically insulated state with respect to the brush wheel and which holds an electrical connection to the brush wheel body in an abutting state, and a bracket which is provided in an electrically conductive state with the brush wheel body and supports the slider. And a resistor layer provided on the inner peripheral surface of the main body and slid in abutting state by the slider, the potentiometer having a vibration-proof function for the brush. Providing the first vibration isolator in contact At the same time, a second vibration isolator having a vibration isolating function is provided in the bracket in a pressed state.

[Operation] With the above-described structure, the present invention has a first anti-vibration body having an anti-vibration function that is provided in contact with the brush and a second anti-vibration function that is provided in the bracket in a pressed state. The vibrating body works to prevent vibration during operation.

[Embodiment] Hereinafter, the present invention will be described in detail based on a preferred embodiment.

FIG. 1 is an exploded perspective view of a potentiometer according to the embodiment with a main part cut away.

In FIG. 1, a first bearing 6 shown by a chain line is press-fitted in the center of a bottom surface 1C of a main body 1 of an aluminum material which is machined into a hat shape as shown in FIG. A second bearing 8 shown by a chain line is press-fitted into the central portion of the lid body 2 which serves as a lid of the main body 1.
The shaft 8 is rotatably supported by the bearing 8.

A first anti-vibration body 22 made of soft urethane foam is attached to the inner surface of the lid body 2. In the state where the lid body 2 is tightened with respect to the main body 1, a pair of brushes to be described later is provided. The outer dimensions of the first vibration isolator 22 are determined so that the first vibration isolator 22 can be in contact with 16.

Further, a convex portion 1A as shown in the drawing is formed by lathe processing or the like on the edge portion near the upper end of the main body 1.
A is a cover 2 for pivotally supporting the shaft 5 described above.
After inserting the shaft body 5 into the second bearing 8, the outer surface of the lid body 2 is aligned with the upper end of the main body 1, and then the retaining ring 3 serves as a hooking portion for tightening.

For this reason, the retaining ring 3 has a substantially C-shaped cross-sectional shape as shown in the figure, and after the extruded material of aluminum is sheared to a predetermined thickness, the valley portion 3A and the screw hole 3B are machined or the like. The screw 9 is provided as shown in the figure, and the screw 9
As the inner diameter of the retaining ring 3 is reduced by tightening, the lid 2 and the convex portion 1A of the main body 1 are tightened,
That is, the potentiometer is completed.

Next, a resistor layer 11 is formed on the inner surface of the wheel body 10 made of an electrically insulating material such as resin and having a high roundness. As shown in the figure, the ring body 10 has the center of rotation of the ring body 5 and the ring body 1
After being aligned so that the center of 0 matches exactly, it is fixed to the inside of the main body 1 using an adhesive or the like.

Here, the resistor layer 11 is not formed over the entire inner surface of the ring body 10 but is formed so as to have both end portions, and the right lead electrode 15A is formed at the right end portion in the figure.
However, the left lead electrodes 14A are respectively connected to the left end portions in the figure.

On the other hand, the side wall of the body 1 is provided with three holes 1B for inserting the three collars 12 made of an insulating material as shown in the drawing, and the holes formed in the three collars 12 are formed. A first electrode 13 and a second electrode 14, which are provided by being press-fitted inside, respectively.
The third electrode 15 and the third electrode 15 are held in an electrically insulated state with respect to the main body 1.

Then, the above-mentioned right lead electrode 15A is the third electrode 15,
Further, the left lead electrodes 14A are connected to the second electrodes 14, respectively, and thus the resistor layer 11 is configured so that the resistance value can be detected outside the main body 1.

On the other hand, a lead electrode 13A is connected to the first electrode 13 so that a pair of brushes 16 described later can be electrically taken out of the main body 1.

A brush wheel body 18 is electrically insulated from the rotatable shaft body 5 via an upper insulator 17 and a lower insulator 19.
Is fixed, while a bracket 20 is provided below the brush wheel body 18 so as to be in electrical contact therewith. A slider 21 is fixed to the tip portion 20A of the bracket 20 by spot welding or the like,
The slider 21 having the tip end portion 21A divided into a plurality of hand-shaped parts of the grandchild's hand is adapted to slide in contact with the resistor layer 11 by the action of its own elastic force. .

Further, between the bracket 20 and the lower insulator 19,
The second anti-vibration body 23 having the convex portion 23A is interposed so as to maintain the pressed state between the convex portion 23A and the tip portion 20A of the bracket 20 so as to suppress the slight vibration during operation of the bracket 20. I have to.

On the other hand, the pair of brushes 16 urged in the closed state by the elastic force come into contact with and slide on the valley portion 18A of the brush wheel body 18. That is, the slider 21 is configured to be electrically taken out of the main body 1 via the first electrode 13.

Therefore, if one side is connected to the first electrode 13 and the other side is connected to either the second electrode 14 or the third electrode 15, the rotation displacement amount in the shaft body 5 changes in the resistance value of the resistor layer 11. As described above, the first vibration isolator 22 is in contact with the brush 16, while the second vibration isolator 23 is attached to the bracket 20 holding the slider 21, as described above. Since the brush 16 is interposed while holding the pressed state, the brush 16
Thus, the vibration generated in the slider 21 can be prevented.

As a result, the brush 16 and the slider 2 caused by unnecessary minute vibrations.
The damage of No. 1 is prevented, and the durability of the potentiometer can be improved.

Further, since the noise during operation is also reduced, it can be used in a place such as a hospital where noise is especially disliked.

As another method of preventing the vibration of the brush 16 described above, the brush 16 may be sandwiched between two separated brushes 16, or the brush 16 may be separated.
For example, the total length of is set to a length that eliminates the natural frequency.

[Effect of the Invention] Since the potentiometer according to the present invention is configured as described above, the microvibration generated between the brush and the slider during the operation of the potentiometer is suppressed, and the brush and the slider are suppressed. It is possible to provide a potentiometer having improved durability, by ensuring the durability of the pendulum for a long period of time.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a potentiometer according to an embodiment of the present invention, in which a main portion is broken, and FIG. 2 is an exploded perspective view of a conventional potentiometer in which a main portion is broken. In the figure, 1 ... Main body, 1A ... Convex portion, 2 ... Lid, 3 ...
Retaining ring, 5 ... Shaft, 6 ... First bearing, 8 ... Second bearing, 9 ... Screw, 10 ... Ring, 11 ... Resistor layer, 1
2 ... color, 13 ... first electrode, 14 ... second electrode,
15 ... Third electrode, 16 ... Brush, 17 ... Upper insulator, 18 ... Brush ring, 18A ... Valley, 19 ... Lower insulator, 20 ... Bracket, 20A ... Tip, 21
...... Slider, 21A ...... Tip, 22 ...... First vibration isolator,
23 ... The second vibration isolator.

Claims (1)

[Scope of utility model registration request] 1. A shaft body rotatably supported by a bearing provided at the center of the bottom surface of the body of the hat-shaped body and a bearing provided at the center of the lid body that serves as a lid of the body, and the shaft. A brush wheel provided in an electrically insulated state with respect to the body; a brush provided in an electrically insulated state with respect to the main body and holding electrical continuity with the brush wheel in a contact state; And a resistor layer provided in an electrically conductive state for supporting the slider, and a resistor layer provided on the inner peripheral surface of the main body and slid in contact with the slider. A potentiometer, wherein a first anti-vibration body having an anti-vibration function is provided in contact with the brush, and a second anti-vibration body having an anti-vibration function is provided in the bracket in a pressed state. Characteristic potentiometer.