KR20210065492A - Resistive type displacement sensor - Google Patents

Abstract

The present invention relates to a resistance displacement sensor, and more specifically, to a linear potentiometer-type resistance displacement sensor, which senses a mechanical position change as a change in an electrical resistance value. A resistance displacement sensor in accordance with an embodiment of the present invention comprises: a frame having a consistent cross-section in a longitudinal direction and having a through hole formed therein in the longitudinal direction; a first resistor disposed in the through hole; a second resistor disposed in the through hole and disposed to face the first resistor; a moving member which linearly reciprocates between the first resistor and the second resistor in the longitudinal direction; a guide member mounted on the moving member and interlocking with the moving member; a first conductive contact member which is disposed on an upper surface of the guide member and in contact with the first resistor; and a second conductive contact member which is disposed on a lower surface of the guide member and in contact with the second resistor.

Description

RESISTIVE TYPE DISPLACEMENT SENSOR

The present invention relates to a displacement sensor, and more particularly, to a linear potentiometer type resistance displacement sensor that senses a mechanical position change as a change in electrical resistance value.

A displacement sensor is a sensor that measures the distance or position an object has moved.

The displacement sensor includes a linear displacement sensor and a rotational displacement sensor, and a potentiometer is a type of the linear displacement sensor. A potentiometer is a device that controls the amount or magnitude of an electrical output signal through a mechanical position change.

Potentiometers are of resistance type, conductive plastic type, magnetic type, and optical type. Among them, the resistance type potentiometer uses the principle that the electrical resistance value changes according to the movement displacement. The principle of the resistance type potentiometer is described in detail in Korean Registered Utility No. 20-0396510.

The resistance-type displacement sensor including the resistance-type potentiometer is installed in precision machining equipment such as lathes and injection machines that require displacement measurement and is widely used.

(Prior Document 1) Korea Registered Utility No. 20-0396510

The resistance-type displacement sensor according to an embodiment of the present invention provides a resistance-type displacement sensor capable of sensing displacement by selectively using any one of a plurality of resistors according to a user's selection.

In addition, there is provided a resistance-type displacement sensor capable of precisely sensing displacement by using all of a plurality of resistors according to a user's selection.

In addition, the resistance-type displacement sensor according to an embodiment of the present invention provides a resistance-type displacement sensor capable of displacement sensing by using any one of a plurality of reference points (or zero points) according to a user's selection.

In addition, the resistance-type displacement sensor according to an embodiment of the present invention provides a resistance-type displacement sensor capable of preventing shaking when the moving member is moved.

The problem to be solved of the present invention is not limited to the problems mentioned above, and other problems not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. will be.

A resistance-type displacement sensor according to an embodiment of the present invention includes: a frame having a consistent cross-section along a longitudinal direction, and having a through hole formed therein along the longitudinal direction; a first resistor disposed in the through hole; a second resistor disposed in the through hole and disposed to face the first resistor; a moving member that linearly reciprocates between the first resistor and the second resistor in the longitudinal direction; a guide member mounted on the moving member and interlocking with the moving member; a first conductive contact member disposed on the upper surface of the guide member and contacting the first resistor; and a second conductive contact member disposed on a lower surface of the guide member and contacting the second resistor member.

When the resistance-type displacement sensor according to the embodiment of the present invention is used, there is an advantage in that displacement can be sensed by selectively using any one of a plurality of resistors according to a user's selection.

In addition, there is an advantage in that displacement can be precisely sensed by using all of a plurality of resistors according to a user's selection.

In addition, there is an advantage that displacement sensing is possible using any one of a plurality of reference points (or zero points) according to a user's selection.

In addition, there is an advantage that can prevent shaking when the moving member is moved.

1 is a perspective view of a resistance type displacement sensor according to an embodiment of the present invention.
2 is a perspective view of a resistance-type displacement sensor according to the embodiment of the present invention shown in FIG. 1 except for the connector 200 .
3 is a perspective view and a partially enlarged view of the frame 100 shown in FIG. 1 .
4 is a perspective view of only the resistance members 600a and 600b shown in FIG. 2 .
FIG. 5 is a plan view of only the first resistance member 600a shown in FIG. 4 .
6 is a perspective view for explaining the positional relationship of the guide member 800 including the resistance members 600a and 600b and the conductive contact member 830a.
7 is a view showing a coupling relationship between the guide member 800 and the resistance members 600a and 600b, and is a cross-sectional view taken along line A-A' of FIG. 1 .
8 to 9 are views showing a state in which the guide member 800 and the moving member 500 are connected.
FIG. 10 is an enlarged perspective view of the connector 200 shown in FIG. 1 .
FIG. 11 is a modified example of the connector 200 shown in FIG. 10 .
12A to 12B are enlarged perspective views of the end cap 300 and the fixing member 700 of FIG. 1 .
13 is an exploded perspective view of FIG. 12 (a).

In the description of the embodiment, in the case where it is described as being formed "above (upper) or under (below)" of each component, the upper (upper) or lower (below) two components are in direct contact with each other or one or more other components disposed between two components. In addition, when expressed as "upper (upper) or lower (lower)", the meaning of not only an upper direction but also a lower direction based on one component may be included.

In the drawings, the thickness or size of each layer is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. In addition, the size of each component does not fully reflect the actual size.

1 is a perspective view of a resistance-type displacement sensor according to an embodiment of the present invention, and FIG. 2 is a perspective view of a resistance-type displacement sensor according to the embodiment of the present invention shown in FIG. 1 except for the connector 200 .

1 to 2 , the resistance displacement sensor according to the embodiment of the present invention includes a frame 100 , a connector 200 , an end cap 300 , a moving member 500 , and resistance members 600a and 600b . ) and a fixing member 700 . Here, the resistance-type displacement sensor according to the embodiment of the present invention is disposed inside the frame 100 and one or more conductive contacts disposed on the guide member (not shown) and the guide member mounted on the end of the moving member 500 . It may further include a member (not shown).

The frame 100 has a cross-section consistent in the longitudinal direction. One or more grooves formed in the longitudinal direction may be formed on the outer surface of the frame 100 .

The frame 100 has both ends. Both ends are one end and the other end. One end is coupled to the connector 200 , and the other end is coupled to the end cap 300 . One end and the connector 200 may be coupled with a fastening means such as a screw. The other end may also be coupled to the end cap 300 by a fastening means such as a screw.

The frame 100 has a through hole 110 therein. The through hole 110 is formed along the longitudinal direction, and resistance members 600a and 600b, a guide member (not shown) and a conductive contact member (not shown) are disposed inside the through hole 110 .

3 is a perspective view and a partially enlarged view of the frame 100 shown in FIG. 1 .

Referring to FIG. 3 , the through-hole 110 of the frame 100 may include a plurality of through-holes 111 , 113 , and 115 . Each of the plurality of through-holes 111 , 113 , and 115 may be a first through-hole 111 , a second through-hole 113 , and a third through-hole 115 .

A first resistance member 600a may be disposed in the first through hole 111 . The first resistance member 600a may be coupled to the first through hole 111 in a sliding manner.

A guide member (not shown), which will be described later, may be disposed in the second through hole 113 . A guide member (not shown) may be coupled to the second through hole 113 in a sliding manner. A guide member (not shown) is mounted on the end of the moving member 500 and linearly reciprocates inside the second through hole 113 in association with the linear reciprocating motion of the moving member 500 .

A second resistance member 600b may be disposed in the third through hole 115 . The second resistance member 600b may be coupled to the third through hole 115 in a sliding manner.

4 is a perspective view of only the resistance members 600a and 600b shown in FIG. 2 .

Referring to FIG. 4 , the resistance members 600a and 600b include a first resistance member 600a and a second resistance member 600b. The first resistance member 600a and the second resistance member 600b are disposed inside the frame 100 to face each other.

FIG. 5 is a plan view of only the first resistance member 600a shown in FIG. 4 . Here, since the second resistance member 600b shown in FIG. 4 is the same as the first resistance member 600a, a description of the second resistance member 600b will be omitted.

Referring to FIG. 5 , the first resistance member 600a includes a substrate 640 , a first resistor 610 and a second resistor 620 disposed on the substrate 640 , first and second resistors 610 , and a terminal 630 electrically connected to the 620 .

The first resistor 610 has a predetermined thickness and width formed of a pure conductor material having an electrical resistance value of 0 on the upper portion of the substrate 640 , and is linearly formed along the length direction of the frame 100 .

The second resistor 620 is disposed on the substrate 640 , and is spaced apart from the first resistor 610 by a predetermined distance and disposed in parallel. The second resistor 620 also has a predetermined thickness and width, and is linearly formed along the length direction of the frame 100 . The second resistor 620 has a predetermined electrical resistance value different from that of the first resistor 610 .

A plurality of terminals 630 are provided, a first terminal is electrically connected to the first resistor body 610 , a second terminal is electrically connected to one end of the second resistor body 620 , and a third terminal is electrically connected to the second resistor body 610 . It is electrically connected to the other end of 620 .

A guide member (not shown) is disposed between the first resistance member 600a and the second resistance member 600b. It will be described with reference to FIG. 6 .

6 is a perspective view for explaining the positional relationship of the guide member 800 including the resistance members 600a and 600b and the conductive contact member 830a.

The guide member 800 is mounted on the end of the moving member 500 , and linear reciprocating motion is possible along the longitudinal direction of the frame 100 according to the movement of the moving member 500 .

The guide member 800 is capable of linear reciprocating motion between the first resistance member 600a and the second resistance member 600b disposed to face each other.

Although omitted in FIG. 6 , the guide member 800 is disposed inside the frame 100 and disposed in the second through hole 113 shown in FIG. 3 .

The guide member 800 is a non-conductive material, and may be, for example, a resin material.

The guide member 800 includes an upper surface and a lower surface. The upper surface may be a surface facing the first resistance member 600a, and the lower surface may be a surface facing the second resistance member 600b.

7 is a view showing a coupling relationship between the guide member 800 and the resistance members 600a and 600b, and is a cross-sectional view taken along line A-A' in FIG. 1, and FIGS. 8 to 9 are the guide member 800 and the moving member ( As views showing a state in which the 500) is connected, FIG. 9 is a view showing a state in which the guide member 800 shown in FIG. 8 is turned over.

7 to 9 , the first conductive contact member 830a is disposed on the upper surface 811a of the guide member 800 , and the second conductive contact member 830b is disposed on the lower surface 811b of the guide member 800 . ) is placed.

The upper surface 811a of the guide member 800 may include an arrangement surface 813a coupled to a portion of the first conductive contact member 830a. The arrangement surface 813a may be formed to be inclined with respect to the upper surface 811a of the guide member 800 . Two of the arrangement surfaces 813a may be formed on the upper surface 811a of the guide member 800 . A first conductive contact member 830a may be disposed on each arrangement surface 813a.

The lower surface 811b of the guide member 800 may include an arrangement surface 813b in contact with a portion of the second conductive contact member 830b. The arrangement surface 813b may be formed to be inclined with respect to the lower surface 811b of the guide member 800 . Two of the arrangement surfaces 813b may be formed on the lower surface 811b of the guide member 800 . A second conductive contact member 830b may be disposed on each arrangement surface 813b.

The first conductive contact member 830a contacts the first resistor 610 and the second resistor 620 of the first resistor 600a.

The second conductive contact member 830b contacts the first resistor body and the second resistor body of the second resistor member 600b.

Each of the first and second conductive contact members 830a and 830b is made of a conductive material such as metal, each of the first and second conductive contact members 830a and 830b has a predetermined thickness, and each arrangement of the guide member 800 It may include a base portion 831 fixedly coupled to the surfaces 813a and 813b and extension portions 835 extending from both ends of the base portion 831 . Accordingly, each of the first and second conductive contact members 830a and 830b may have a 'C' shape as a whole.

The end of the extension 835 may include a plurality of cutouts 837 cut into a plurality, and the end of each cutout 837 may have a curved upward shape. An end of each cutout 837 may contact the first resistor 610 or the second resistor 620 .

As shown in FIG. 8 , the two first conductive contact members 830a are disposed to face each other on the upper surface 811a of the guide member 800 . Here, the extension portions 835 of the two first conductive contact members 830a are disposed to face each other.

As shown in FIG. 9 , the two second conductive contact members 830b are disposed to face each other on the lower surface 811b of the guide member 800 . Here, the extension portions 835 of the two second conductive contact members 830b are disposed to face each other.

As described above, the resistance displacement sensor according to the embodiment of the present invention is disposed on both sides of the plurality of resistors 600a and 600b and the guide member 800 disposed to face each other inside the frame 100, and the plurality of resistors 600a , 600b) and includes a plurality of conductive contact members (830a, 830b) in contact. Therefore, the resistance displacement sensor according to the embodiment of the present invention can measure one displacement by linear reciprocating motion of the moving member 500 using the first resistor 600a and the first conductive contact member 830a. In addition, there is an advantage that another displacement can be measured by the linear reciprocating motion of the moving member 500 using the second resistor 600b and the second conductive contact member 830b.

Also, the reference point (or zero point) of each of the first resistor 600a and the second resistor 600a may be set differently. When the reference point of the first resistor 600a and the reference point of the second resistor 600b are set differently, there is an advantage in that displacement measurement can be performed through one resistor having a desired reference point according to a user's selection.

Meanwhile, the guide member 800 may be plural. For example, the guide member 800 shown in FIGS. 7 to 9 may be a first guide member, and additionally, a second guide member may be fixedly mounted to a specific portion between both ends of the movable member 500 . have. In this case, a first conductive contact member contacting the first resistor may be disposed on an upper surface of the first guide member, and a second conductive contact member contacting the second resistor member may be disposed on a lower surface of the second guide member.

As such, when a plurality of guide members are used, the reference point (or zero point) may be set differently. There is an advantage in that a user can select and use one that meets a desired reference point among different reference points, and fine displacement sensing is possible by using both reference points.

Referring again to FIG. 1 , the connector 200 is fastened to one end of both ends of the frame 100 . The connector 200 may be fastened to the frame 100 through a fastening means such as a screw.

The connector 200 is electrically connected to the first resistance member 600a and the second resistance member 600b shown in FIG. 2 . The connector 200 and the first resistance member 600a and the second resistance member 600b may be electrically connected through a wire. One end of the wire may be connected to the terminal 630 of the first and second resistance members 600a and 600b, and the other end of the wire may be connected to the connector 200 .

FIG. 10 is an enlarged perspective view of the connector 200 shown in FIG. 1 .

Referring to FIG. 10 , the connector 200 includes a base part 210 and a first connection terminal part 251 and a second connection terminal part 252 arranged to protrude from the base part 210 .

The first connection terminal part 251 and the second connection terminal part 252 may be disposed together on one surface of the base part 210 . For example, as shown in FIG. 10 , the first connection terminal part 251 may be disposed on the second connection terminal part 252 , but the present invention is not limited thereto. It can be placed on the side.

The connector 200 includes a first switch part 231 and a second connection terminal part 252 that allow the first connection terminal part 251 to protrude from one surface of the base part 210 from one surface of the base part 210 . It may include a second switch unit 232 to protrude.

The connector 200 may have a first opening 211 restricting movement of the first switch unit 231 and a second opening 212 restricting movement of the second switch unit 232 .

The user may operate the first switch unit 231 in a first direction to make the first connection terminal unit 251 protrude from one surface of the base unit 210, and in a second direction opposite to the first direction. By manipulating, the first connection terminal part 251 may be inserted into one surface of the base part 210 . Here, the first direction and the second direction may be directions parallel to the longitudinal direction of the frame 100 .

In addition, the user may manipulate the second switch unit 232 in the first direction so that the second connection terminal unit 252 protrudes from one surface of the base unit 210 , and the second direction opposite to the first direction is the second connection terminal unit 252 . direction to insert the second connection terminal part 252 into one surface of the base part 210 .

The structure of the connector 200 shown in FIG. 10 may use one connection terminal part according to a user's selection. Of course, for convenience, the user may manipulate and use both the first and second connection terminals to protrude.

As described above, the resistance displacement sensor according to the embodiment of the present invention includes a connector 200 having a plurality of connection terminal portions 251 and 252 , and the connector 200 includes a plurality of resistors 600a and 600b and electrical is connected to Accordingly, the resistance-type displacement sensor according to the embodiment of the present invention may transmit an electrical signal from one of the two resistors 600a and 600b to an external device using the connector 200 .

The reference point (or zero point) of each of the first resistor 600a and the second resistor 600a may be set differently. When the reference point of the first resistor 600a and the reference point of the second resistor 600b are set differently, the user There is also an advantage that displacement measurement can be performed through one resistor having a desired reference point according to the selection of .

FIG. 11 is a modified example of the connector 200 shown in FIG. 10 .

Referring to FIG. 11 , the connector 200 ′ includes a first base part 210a and a second base part 210b. The second base part 210b is disposed in contact with one side of the first base part 210a. The first base part 210a and the second base part 210b may be fastened to one end of the frame 100 shown in FIG. 1 through a fastening means.

The first connection terminal part 251' is disposed to protrude from one surface of the first base part 210a, and the second connection terminal part 252' is disposed to protrude from one surface of the second base part 210b. Here, the protrusion direction of the first connection terminal part 251 ′ and the second connection terminal part 252 ′ may be the longitudinal direction of the frame 100 .

As described above, the resistance displacement sensor according to the embodiment of the present invention includes a connector 200 ′ having a plurality of connection terminal portions 251 ′ and 252 ′, and the connector 200 ′ includes a plurality of resistors 600a, 600b) and may be electrically connected. Therefore, the resistance displacement sensor according to the embodiment of the present invention can transmit an electrical signal from any one of the two resistors 600a and 600b to an external device using the connector 200, and the two resistors ( There is an advantage in that each electrical signal from 600a and 600b can be transmitted to an external device using the connector 200 .

The reference point (or zero point) of each of the first resistor 600a and the second resistor 600a may be set differently. When the reference point of the first resistor 600a and the reference point of the second resistor 600b are set differently, the user also has the advantage of being able to perform two different displacement measurements through two resistors. There is an advantage in that even a minute movement of the moving member 500 can be measured using two different displacement measurement results.

Again, referring to FIG. 1 , the moving member 500 may have a rod shape having a predetermined length in a direction parallel to the longitudinal direction of the frame 100 . The moving member 500 reciprocates linearly by an external force.

A portion of the moving member 500 is disposed inside the frame 100 , and the other portion is disposed outside the frame 100 .

The guide member 800 is mounted at one end of both ends of the moving member 500 . Here, one end of the moving member 500 is disposed inside the frame 100 .

As shown in FIG. 13 , a separation preventing member 510 is disposed on the moving member 500 to prevent the packing 770 , the fixing member 700 and the end cap 300 from being separated from the moving member 500 . can be The separation preventing member 510 may be a bolt capable of being coupled to a spiral formed on an outer surface of one end of the moving member 500 .

The end cap 300 is fastened to the other end of both ends of the frame 100 . The end cap 300 and the frame 100 may be fastened through a fastening means 750 such as a screw.

12A to 12B are enlarged perspective views of the end cap 300 and the fixing member 700 of FIG. 1 , and FIG. 13 is an exploded perspective view of FIG. 12A .

12 (a) to (b) and 13, the fastening means 750 may be a bolt.

The fastening means 750 may include a body part 751 and a coupling part 753 protruding from the body part 751 and fastened to the frame 100 . A spiral may be formed on the outer surface of the coupling portion 753 .

The coupling part 753 may pass through the coupling hole 355 of the end cap 300 and the protective member 350 to be fastened to the coupling part 105 of the frame 100 .

A screw groove to which a bolt can be coupled may be formed in the body portion 751 . The body part 751 is disposed in the coupling groove 310 of the end cap 300 , and the length of the body part 751 is longer than the depth of the coupling groove 310 of the end cap 300 .

When the body part 751 is coupled to the coupling groove 310 of the end cap 300 , the upper end of the body part 751 protrudes higher than the upper surface of the end cap 300 . The upper end of the body part 751 may be coupled to the coupling groove 710 of the fixing member 700 .

The end cap 300 has a through hole through which the moving member 500 is fitted. The moving member 500 may reciprocate linearly while being fitted in the through hole of the end cap 300 .

A protection member 350 may be disposed between the end cap 300 and the frame 100 to prevent intrusion of foreign substances.

The fixing member 700 may be coupled to the end cap 300 and the moving member 500 .

The fixing member 700 has a predetermined length in the longitudinal direction of the frame 100 or in a direction perpendicular to the longitudinal direction of the moving member 500 . Coupling grooves 710 are formed at both ends, respectively, and a through hole into which the moving member 500 is fitted is formed in the middle between both ends. In addition, a packing groove 730 into which the packing 750 can be inserted may be formed around the through hole.

The fixing member 700 may be closely coupled to the end cap 300 by the packing 770 . The fixing member 700 has a coupling groove 710 , and the coupling groove 710 has a space into which the body 751 of the fastening means 750 can be inserted.

The fixing member 700 may have predetermined grooves formed at both ends at positions corresponding to the positions of the coupling grooves 710 , respectively. The groove and the coupling groove 710 may be connected through a hole. After the bolt is inserted into the groove and hole, it may be coupled to the groove formed in the body part 751 . Through this, the fixing member 700 may be closely fixed to the end cap 300 .

Since the moving member 500 is formed to be elongated in the longitudinal direction of the frame 100 , the moving member 500 does not move accurately along the longitudinal direction of the frame 100 inside the frame 100 , but is slightly twisted to move. can The shifting of the moving member 500 may reduce the sensitivity of the resistance-type displacement sensor. However, since the resistance-type displacement sensor according to the embodiment of the present invention has the fixing member 700 , it is possible to prevent the shifting of the movable member 500 to improve the sensing sensitivity. Specifically, the upper end of the body portion 751 of the fastening means 750 is fitted into the coupling grooves 710 respectively formed at both ends of the fixing member 700 , and the packing 770 is fitted into the packing groove 730 . As a result, the moving member 500 can accurately reciprocate in a straight line, and cannot be turned in another direction.

Features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, features, structures, effects, etc. illustrated in each embodiment can be combined or modified with respect to other embodiments by those of ordinary skill in the art to which the embodiments belong. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

In addition, although the embodiment has been mainly described in the above, this is only an example and does not limit the present invention, and those of ordinary skill in the art to which the present invention pertains in the range that does not deviate from the essential characteristics of the present embodiment. It will be appreciated that various modifications and applications not illustrated are possible. For example, each component specifically shown in the embodiment can be implemented with modification. And differences related to such modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

100: frame
200: connector
300: end cap
500: moving member
600a, 600b: resistance member
700: fixing member
800: guide member

Claims (8)

a frame having a consistent cross-section along the longitudinal direction and having a through hole formed therein along the longitudinal direction;
a first resistor disposed in the through hole;
a second resistor disposed in the through hole and disposed to face the first resistor;
a moving member that linearly reciprocates between the first resistor and the second resistor in the longitudinal direction;
a guide member mounted on the moving member and interlocking with the moving member;
a first conductive contact member disposed on the upper surface of the guide member and contacting the first resistor; and
a second conductive contact member disposed on a lower surface of the guide member and contacting the second resistor;
Including, a resistive displacement sensor.
The method of claim 1,
A connector coupled to one end of both ends of the frame; further comprising,
The connector includes a base portion; and a first connection terminal part disposed on the base part and electrically connected to the first resistor body; and a second connection terminal part disposed on the base part and electrically connected to the second resistor body;
Any one of the first connection terminal part and the second connection terminal part selectively protrudes from the base part of the connector,
Resistive displacement sensor.
The method of claim 1,
A connector coupled to one end of both ends of the frame; further comprising,
The connector includes a first base portion; a second base portion disposed adjacent to one side of the first base portion; a first connection terminal portion disposed on the first base portion and electrically connected to the first resistor; and a second connection terminal part disposed on the second base part and electrically connected to the second resistor body.
The method of claim 1,
an end cap coupled to the other end of both ends of the frame;
fastening means for fastening the end cap and the frame; and
The resistance displacement sensor further comprising a; has a through hole through which the moving member passes, and is fixed in close contact with the end cap to prevent distortion of the moving member.
5. The method of claim 4,
The fastening means includes a body portion and a coupling portion extending from the body portion to be coupled to the frame,
The end cap has a through hole through which the moving member passes and a coupling groove formed on both sides of the through hole as a center and a body portion of the fastening means is disposed,
The length of the body of the fastening means is longer than the depth of the coupling groove of the end cap,
Wherein the fixing member has a through hole through which the moving member passes and a coupling groove formed on both sides of the through hole as a center and an upper end of the body is disposed.
The method of claim 1,
The guide member may include a first guide member mounted to an end of the moving member; and a second guide member mounted on a portion between both ends of the moving member.
The first conductive contact member is disposed on the upper surface of the first guide member,
The second conductive contact member is disposed on a lower surface of the second guide member, a resistance displacement sensor.
The method of claim 1,
The first conductive contact member includes a base portion and extension portions extending from both ends of the base portion,
The end of the extension includes a plurality of cutouts,
An end of each of the cutouts has an upward curved shape and is in contact with the first resistor.
8. The method of claim 7,
The upper surface of the guide member includes a disposition surface on which the base portion of the first conductive contact member is disposed,
The disposition surface is inclined with respect to the upper surface of the guide member, a resistance type displacement sensor.

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