JP6469278B1 - Wire wound potentiometer - Google Patents

Abstract

A wire-wound potentiometer with reduced thickness is provided. A wound potentiometer includes an input terminal connected to a first resistance line, an output terminal connected to a second resistance line, and surfaces of the first resistance line and the second resistance line. A slider having a contact 23 that slides on the first resistance wire 61 and the second resistance wire 62, and the contact 23 of the slider contacts the first resistance wire 61 and the second resistance wire 62. The resistance wire 62 is short-circuited, and an input voltage is applied from the input terminal and simultaneously, an output voltage is output from the output terminal. [Selection] Figure 5

Description

  The present invention relates to a winding potentiometer that can obtain a target output voltage by sliding a contact point in contact with a winding resistor.

  Conventionally, a potentiometer that can take out an output voltage by bringing a contact point into contact with a resistor is known (for example, Patent Document 1).

  In addition, a winding potentiometer that uses a winding element (resistor) in which resistance wires are wound around a core material having an insulating property or an insulating film at a constant pitch is known.

  As shown in FIG. 10, in the structure of the conventional wound potentiometer 100, both ends of the resistance wire wound around the winding element 106 are connected to the input terminal 105 via a conductive member. The contact fixed to the tip of the slide lever of the slider 140 is connected to an output terminal 105 different from the input terminal via the slide arm 121, the slip ring 103, and the wire contact 104.

  The slip ring 103 is fixed to the shaft 112 via a bush 128 which is an insulating member. The wire contact 104 is bent in a V shape, the bent side is fixed to the output terminal 105, and the opposite side is in contact with the groove of the slip ring 103 with an appropriate pressure. With these structures, when the contact slides on the winding element 106 in response to the rotation of the shaft 112 and a voltage is applied between the input terminals 105, the contact position on the winding element 106, that is, the shaft 112. The rotation angle can be taken out from the output terminal 105 as the divided voltage of the applied voltage.

JP 2012-114280 A

  However, in the conventional wound potentiometer 100, the positional relationship between the winding element 106 and the contact and the positional relationship between the slip ring 103 and the wire contact 104 do not interfere with each other. The slide arm 121 is arranged in a shifted state. For this reason, in order to ensure the space for accommodating the slip ring 103 and the slide arm 121, the axial height of the shaft of the case 130 increases to some extent, and there is a problem that it is difficult to reduce the thickness.

  The present invention has been made in view of such a point, and an object thereof is to provide a thin wire-wound potentiometer.

  In order to solve the above-described problems, a wound potentiometer of the present invention includes an annular core material, a first resistance wire wound around the outer periphery of the core material at a predetermined interval, and a first resistance wire in parallel. A second resistance wire having a lower resistance value than the first resistance wire, wound around the outer periphery of the core material, an input terminal connected to the first resistance wire, and a second resistance wire An output terminal, and a slider having contacts that slide on the surfaces of the first resistance wire and the second resistance wire, and the contact points of the slider are the first resistance wire and the second resistance wire. The first resistance wire and the second resistance wire are short-circuited in contact with the wire, and an input voltage is applied from the input terminal and simultaneously an output voltage is output from the output terminal.

According to the wire wound potentiometer of the present invention, the number of parts is reduced and the outer dimensions are reduced, so that the thickness can be reduced. In addition, since the number of parts is reduced, the assembly work of the potentiometer can be easily performed.
Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

1 is an external perspective view of a wound potentiometer according to an embodiment of the present invention. It is a perspective view in the state where the back cover of the winding type potentiometer concerning the embodiment of the present invention was removed. It is sectional drawing of the winding type potentiometer cut | disconnected by the AA line of FIG. 1 is an overall perspective view of a winding element used in a wound potentiometer according to an embodiment of the present invention. FIG. 5A is a diagram showing a contact state between the winding element and the contact, and FIG. 5B is an enlarged view thereof. It is an output characteristic view of the wire wound potentiometer according to the embodiment of the present invention. It is a figure explaining the procedure which assembles the winding type potentiometer which concerns on embodiment of this invention (the 1). It is a figure explaining the procedure which assembles the winding type potentiometer which concerns on embodiment of this invention (the 2). It is a figure explaining the procedure which assembles the winding type potentiometer which concerns on embodiment of this invention (the 3). It is sectional drawing of the conventional winding type potentiometer.

  Hereinafter, an embodiment of a winding potentiometer of the present invention (hereinafter referred to as “this example”) will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the common member in each figure. In each drawing, the notation of lead wires used for connection and the like is omitted as appropriate.

FIG. 1 is an external perspective view of a wound potentiometer 1 of this example.
As shown in FIG. 1, the winding potentiometer 1 includes a bottomed cylindrical case 30 and a shaft 12 inserted into the bottom surface of the case 30. The back cover 8 is detachably attached to the upper portion of the case 30 by a connection band 25 and a connection band screw 27. A terminal portion 5 is provided on a side surface of the case 30, and the terminal portion 5 is composed of a plurality of terminals 51, 52, and 53. Among the plurality of terminals, the terminals 51 and 53 are input terminals, and the terminal 52 is an output terminal.

FIG. 2 is a perspective view of the winding potentiometer 1 with the back cover 8 removed.
As shown in FIG. 2, an upper end portion 12 a of the shaft 12 inserted from the bottom surface portion is located in the center of the case 30.

  A winding element 6 as a resistor is provided inside the case 30. The winding element 6 has an annular shape and is disposed along the inner surface below the case 30. The winding element 6 is connected to the terminal portion 5 through a lead wire. Details of the winding element 6 will be described later.

  A slider 40 having a contact 23 that is in sliding contact with the winding element 6 is attached to the shaft 12 via a cylindrical bush 28 made of an insulating member. The slider 40 is movable along the circumferential direction of the shaft 12. The slider 40 is coupled to the bush 28, and is made of a metal slide arm 21 that extends toward the inner surface of the case 30. The slider 40 is connected to the tip of the slide arm 21 and extends along the inner surface of the case 30. The slide lever 22 and a hemispherical contact 23 protruding toward the inner surface of the case 30 provided at the tip of the slide lever 22 are configured. The slide lever 22 is composed of a thin metal member having spring properties, and the contact 23 can be slid along the winding element 6 by applying an appropriate pressure to the contact 23.

  In this example, the integrally formed resin bush 28 and metal slide arm 21 are used. However, the bush 28 and slide arm 21 may be formed of separate parts.

FIG. 3 is a cross-sectional view of the wound potentiometer 1 of the present example cut along line AA in FIG.
As shown in FIG. 3, the back cover 8 is fixed to the case 30 by the connecting band 25 in a state where the tip end portion 12 a of the shaft 12 is fitted in the fitting hole 8 a formed in the center of the back cover 8. Yes.

  The ball bearing 10 is fitted in the holding hole 31 a formed in the center of the fitting hole 8 a and the bottom surface portion 31. The shaft 12 is rotatably supported with respect to the case 30 through the ball bearing 10.

  An annular element holder 26 having a recess 26 a for holding the winding element 6 is provided below the inner surface of the case 30. The winding element 6 is placed in the recess 26 a of the element holder 26.

  The slider 40 is coupled to the bush 28 at the center of the bush 28 in the height direction. That is, in this example, the slider 40 is disposed in the space between the back cover 8 and the bottom surface portion 31 with the contact 23 being in contact with the winding element 6.

FIG. 4 is an overall perspective view of the winding element 6 used in this example.
As shown in FIG. 4, the winding element 6 is formed by winding two types of resistance wires 61 and 62 at a constant pitch on an insulating core member 60 formed in an annular shape with both end portions 6a being close to each other. It is made up of so-called two-rolls. In addition, you may use the member which has an insulating film as a core material.

  The two types of resistance lines 61 and 62 include a first resistance line 61 having a predetermined resistance value and a second resistance line 62 having a resistance value lower than the resistance value of the first resistance line 61. The first resistance wire 61 is an element that determines the total resistance value as a potentiometer, similarly to the winding element used in the conventional wound potentiometer. In addition, in this example, it is comprised so that the wire diameter of the 1st resistance wire 61 and the wire diameter of the 2nd resistance 62 may become substantially the same. Thereby, the contact 23 can be smoothly slid along the resistance wire.

  In the vicinity of both ends 6 a of the winding element 6, one end portion of the end portion of the first resistance wire 61 is connected to the input terminal 51 through a conductive member, and the other end portion is connected to the input terminal 53. One end or both ends of the second resistance wire 62 are connected to the output terminal 52 via a conductive member.

FIG. 5A is a diagram showing a contact state between the winding element and the contact, and FIG. 5B is an enlarged view thereof.
As shown in FIG. 5A, the contact 23 of the slider 40 in this example is always kept in contact with the resistance wire wound around the winding element 6. In addition, as shown in FIG. 5B, in this example, the contact 23 that slides on the resistance wire is configured to always contact at least one location of the first resistance wire 61 and the second resistance wire 62 at the same time. . That is, in this example, when the contact 23 slides on the resistance wire, the first resistance wire 61 and the second resistance wire 62 are always short-circuited via the contact 23.

  As a result, in the wound potentiometer 1 of this example, the voltage at the contact position when the voltage is applied to the input terminals 51 and 53 (voltage division by the first resistance wire 61) is short-circuited with the first resistance wire 61 by the contact 23. The second resistance wire 62 can be taken out from the output terminal 52. That is, the rotation angle of the shaft 12 can be taken out from the output terminal 52 as the divided voltage of the applied voltage.

  In the wound-type potentiometer 1 of this example, the slip ring 103 and the wire contact 104 used in the conventional wound-type potentiometer 100 are not required, so the shaft axis of the case 30 for housing the slip ring 103 and the wire contact 104 is used. A space in the direction is not necessary, and the wound potentiometer 1 can be thinned.

  Furthermore, since the slip ring 103 and the wire contact 104 are not required, the number of parts can be reduced and the cost can be reduced. Moreover, the work process at the time of assembling the winding potentiometer 1 can be reduced, and the efficiency of the assembly work can be increased.

  FIG. 6 is an output characteristic diagram of the wound potentiometer 1 of the present example, in which the horizontal axis represents the rotation angle of the shaft 12 in the clockwise direction, and the vertical axis represents the output voltage ratio.

  As shown in FIG. 6, the output voltage ratio from the output terminal 52 connected to the second resistor 62 rises from 0%, and 100% output can be obtained according to the rotation angle range of the slider 40. . In this example, the voltage output is set to 100% when the rotation angle range of the slider is 350 °.

  The slope of the output voltage ratio shown in the figure is an example, and can be set arbitrarily. In this example, the description is based on the combination of resistors whose output voltage ratio changes linearly. However, a combination of resistors whose output voltage ratio can be expressed by a predetermined function characteristic may be used. .

  Next, a procedure for assembling the wound potentiometer 1 of this example will be described with reference to exploded views of FIGS.

The procedure for assembling the winding element 6 to the case 30 will be described with reference to FIG.
As shown in FIG. 7, the terminal portion 5 is press-fitted and fixed to the case 30 in advance. First, the ball bearing 10 is fitted into the holding hole 31a formed at the center of the bottom surface portion 31 of the case 30 and fixed by adhesion. Next, after fixing the winding element 6 to the concave portion 26 a of the annular element holder 26, the element holder 26 is fitted and fixed under the inner side surface of the case 30.

  After fixing the element holder 26 to the case 30, the first resistance wire 61 and the input terminals 51 and 53 of the winding element 6, the second resistance wire 62 and the output terminal 52, and a conductive member (not shown) are used. Use to connect.

  Next, an operation procedure for assembling the shaft 12 to the case 30 will be described with reference to FIG.

First, the slider 40 is attached to the shaft 12.
In the vicinity of the upper end portion 12a of the shaft 12, two engaging grooves for engaging the CE ring 14 are formed. After the CE ring 14 is engaged with the lower engaging groove and the slide lever 22 with the contact 23 attached to the tip is assembled to the slide arm 21, the bush 28 to which the slide arm 21 is coupled is connected to the upper end of the shaft 12. Insert from part 12a. At this time, the adjustment washer 13 may be sandwiched between the CE ring 14 and the bush 28 as necessary. Thereafter, the CE ring 14 is engaged with the upper engaging groove.

  Next, the lower end portion of the shaft 12 to which the slider 40 is attached is inserted into the through hole 33 formed in the center of the bottom surface portion 31 of the case 30, and the shaft 12 is inserted into the case 30 provided with the element holder 26. Assemble. After the shaft 12 is assembled to the case 30, the spring-like slide lever 22 is adjusted so that the contact state between the contact 23 and the winding element 6 (contact pressure) becomes appropriate.

  Further, when the contact 23 of the slider 40 does not contact the winding element 6 in the axial direction of the shaft 12, the number of adjusting washers 13 sandwiched between the CE ring 14 and the bush 28 below. Make a fine adjustment by changing. When it is confirmed that the positional relationship between the contact 23 and the winding element 6 is appropriate, the bush 28 and the shaft 12 are bonded and fixed.

  Next, a procedure for assembling the back cover 8 to the case 30 to which the slider 40 is attached will be described with reference to FIG.

First, the ball bearing 10 is fitted into the fitting hole 8a formed in the center portion of the back cover 8, and is fixed by adhesion.
Next, after the adjustment washer 13 is inserted into the shaft 12 attached to the case 30, the back cover 8 to which the ball bearing 10 is fixed is fitted onto the upper portion of the case 30. At this time, the upper end portion 12 a of the shaft 12 is fitted into the fitting hole 8 a formed in the center portion of the back cover 8. Thereafter, the back cover 8 is fixed to the case 30 using the connection band 25 and the connection band screw 27.

  At this time, in the axial direction of the shaft 12, it is confirmed whether or not the shaft 12 is rattled. When the shaft 12 is rattled, the number of the adjustment washers 13 sandwiched between the CE ring 14 and the back cover 8 is increased, or the thickness of the adjustment washers 13 is changed, thereby causing the rattling. Make fine adjustments to remove.

  As described above, according to the wound potentiometer 1 of this example, it is not necessary to use a slip ring and a wire contact unlike the conventional wound potentiometer, so that the number of parts can be reduced and the outer dimension of the case can be reduced. . As a result, the wound potentiometer can be made thin.

  The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention described in the claims. For example, the configuration of the slider 40 is not limited to this example, and any configuration may be used as long as the contact 23 is in contact with the winding element 6 and can slide.

  Further, the winding element 6 having two windings in this example may be applied to a linear sliding type potentiometer and a multi-rotation type potentiometer.

DESCRIPTION OF SYMBOLS 1 ... Winding type potentiometer, 5 ... Terminal part, 6 ... Winding element, 8 ... Back cover, 10 ... Ball bearing, 12 ... Shaft, 13 ... Adjustment washer, 14 ... CE type ring, 21 ... slide arm, 22 ... slide lever, 23 ... contact, 25 ... connection band, 26 ... element holder, 26a ... recess, 27 ..Screw for connecting band, 28 ... Bush, 30 ... Case, 31 ... Bottom part, 31a ... Holding hole, 33 ... Through hole, 40 ... Slider, 51 52 ... Input terminal, 53 ... Output terminal, 60 ... Core material, 61 ... First resistance wire, 62 ... Second resistance wire, 100 ... Winding potentiometer, 103 ...・ Slip ring, 104 ... Wire contact, 105 ... Child, 106 ... winding element, 112 ... shaft, 121 ... slide arm, 128 ... bush, 130 ... Case, 140 ... wiper

Claims (2)

An annular core material;
A first resistance wire wound around the outer periphery of the core member at a predetermined interval;
A second resistance wire having a resistance value lower than that of the first resistance wire, wound around the outer periphery of the core material so as to be parallel to the first resistance wire;
An input terminal connected to the first resistance wire;
An output terminal connected to the second resistance wire;
A slider having a contact that slides on the surfaces of the first resistance wire and the second resistance wire;
The contact of the slider contacts the first resistance wire and the second resistance wire, short-circuits the first resistance wire and the second resistance wire, and applies an input voltage from the input terminal. At the same time, a winding potentiometer that outputs an output voltage from the output terminal. The wire wound potentiometer according to claim 1, wherein a wire diameter of the first resistance wire is equal to a wire diameter of the second resistance wire.

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