TWI745197B - Positioning mechanism, handler, tester, and testing equipment - Google Patents

Abstract

The present invention reveals a positioning mechanism, including a first board, a second board, and a real-time detecting unit. The first board and the second board have a first positioning module and a second positioning module which engage with each other. The real-time detecting unit includes a laying surface on the second board, a tunnel connecting with the laying surface, and a moving detector disposed in the tunnel. When the laying surface fits on position, the moving detector detects on a detecting target via the tunnel to determine whether the detecting target leaves the second board. Thus, the operator can be warned of the abnormal event immediately to eliminate the event quickly.

Description

Positioning mechanism, working machine, testing machine and testing equipment

The invention relates to a real-time detection unit, and is applied to positioning mechanisms, working machines, testing machines and testing equipment.

Nowadays, electronic component testing equipment includes a working machine and a testing machine. The testing machine can be equipped with testers with different numbers of test sockets according to the operation requirements. Hold and test electronic components.

Please refer to Figure 1, the working machine 10 is provided with a through hole 12 in the testing area of the machine 11, and the testing machine 20 is provided with a tester on the base 21. The tester includes an electrically connected circuit board 22 and a test base 23. The test base 23 is provided for For holding and testing electronic components, a positioning mechanism is provided with a first substrate 31 with a plurality of first positioning components 32 on the bottom surface of the machine table 11 of the working machine 10, and a plurality of second positioning components is provided on the base 21 of the testing machine 20 34 of the second substrate 33; the worker moves the testing machine 20 to the bottom surface of the machine table 11 of the working machine 10. The positioning mechanism uses the first positioning component 32 to move the second positioning component 34 so that the top surface of the second substrate 33 is attached Fit on the bottom surface of the machine table 11 to position the test machine 20 and a plurality of test seats 23; the crimper (not shown in the figure) of the test equipment moves downwards in the Z direction to the preset working height, and uses the preset down force The electronic component is pressed down so that the plurality of contacts of the electronic component electrically contact the plurality of probes of the test base 23 to perform the test operation.

However, during the testing process of the electronic component testing of the test equipment, the staff will not perform calibration operations. If the first positioning component 32 of the positioning mechanism cannot reliably lock the second positioning component 34, it will cause the second The top surface of the substrate 33 is abnormally separated from the bottom surface of the machine table 11 and has a gap, which causes the testing machine 20 and the plurality of test seats 23 to move downward and deviate from the preset assembly position, but the staff cannot immediately know this abnormal situation. When the crimping device moves to the preset working height, the test base 23 will deviate downwards, and the electronic component cannot be crimped with the preset pressure, so that part of the probes of the electronic component cannot reliably contact the contacts of the test base 23 , Which in turn affects the test yield of electronic components.

The first object of the present invention is to provide a positioning mechanism comprising a first substrate, a second substrate, and an instant detection unit. The known unit is provided with a bonding surface on the second substrate, and is provided with a channel communicating with the bonding surface, and the channel is used for disposing a displacement sensor; whereby the first substrate and the second substrate can be respectively assembled on the first object and the second object , The bonding and assembly state of the bonding surface of the second substrate on the first object and the station to be inspected on the second object, using a displacement sensor to sense the authenticity of bonding between the second substrate and the station to be inspected in real time, This allows the workpiece personnel to know whether the first object is separated from the second object in real time according to the sensing signal, so as to quickly eliminate the abnormality, thereby improving the test quality.

The second objective of the present invention is to provide a working machine, which includes a machine, at least one device and a real-time detection unit. The machine is equipped with at least one device for performing preset operations. The machine is also provided with at least one test area. It is used to house the tester, and the tester performs the test operation on the electronic components. The real-time detection unit is provided with a bonding surface on the bottom surface of the test area of the machine, and a channel connecting the bonding surface is provided, and the channel is provided with a displacement sensor ; During the assembly state of the bonding surface of the machine and the station to be inspected of an object, the displacement sensor is used to sense the authenticity of the machine and the station to be inspected in real time for the staff to follow Sensing The signal knows whether the operating machine is separated from the object in real time, and the abnormality can be quickly eliminated, thereby improving the quality of the test.

The third objective of the present invention is to provide a testing machine, which includes a base and a real-time detection unit, the base is for assembling the tester, the real-time detection unit is provided with a bonding surface on the base, and is provided with a channel that communicates with the bonding surface, and the channel is for configuration A displacement sensor; when the bonding surface of the pedestal and the station to be inspected are assembled and assembled, the displacement sensor is used to sense the authenticity of the joint between the pedestal and the station to be inspected in real time. The staff knows whether the tester is separated from the object in real time based on the sensing signal, so that the abnormality can be quickly eliminated, thereby improving the quality of the test.

The fourth object of the present invention is to provide a test equipment, including a working machine, a testing machine, a real-time detection unit, and a central control device; the machine of the working machine is equipped with at least one device, which performs preset operations, and the machines are arranged in parallel There is at least one test area; the pedestal of the testing machine is for assembling the tester, and the tester performs test operations on the electronic components; the real-time detection unit is provided with a bonding surface on one of the working machine and the testing machine, and a connected bonding is provided The channel of the surface, the channel is provided with a displacement sensor, the other of the working machine and the testing machine is provided with a station to be inspected, and relative to the displacement sensor, the bonding surface and the station to be inspected are bonded In the assembly state, the displacement sensor is used to sense the authenticity of the bonding surface and the station to be inspected in real time, so that the staff can know whether the working machine and the test machine are separated according to the sensing signal, and the abnormality can be quickly eliminated; The control device is used to control and integrate the actions of various devices and units to perform automated operations.

The fifth object of the present invention is to provide a test equipment, including a working machine, a tester, a real-time detection unit, and a central control device; the machine of the working machine is equipped with at least one device, and the device is used to perform preset operations, and the machines are arranged in parallel There is at least one test area; the tester includes a mounting part, a circuit board and a test base. The mounting part is assembled on the bottom of the test area of the machine, and is provided with electrical connection circuit boards and test bases. The test base is used for testing electronics Component; the real-time detection unit has a bonding surface on one of the working machine or the tester , And there is a channel that communicates with the bonding surface. The channel is used to configure a displacement sensor. The other of the working machine or the tester is equipped with a station to be inspected, and relative to the displacement sensor, on the bonding surface and The bonding and assembly status of the station to be inspected uses displacement sensors to sense the authenticity of the bonding surface and the station to be inspected in real time, so that the staff can instantly know whether the working machine and the tester are separated based on the sensing signal , And can quickly eliminate abnormalities; the central control device is used to control and integrate the actions of various devices and units to perform automated operations.

[Learning]

10: Working machine

11: Machine

12: Through hole

20: Test machine

21: Pedestal

22: circuit board

23: Test Block

31: The first substrate

32: The first positioning component

33: second substrate

34: The second positioning component

[this invention]

41: The first substrate

411: The first positioning component

42: second substrate

421: second positioning component

422: Fitting surface

423: Channel

43: Displacement sensor

A: Station to be inspected

50: working machine

51: Machine

511: Through hole

512: Fitting surface

513: Channel

514: Displacement Sensor

52: Feeding device

53: Receiving device

541: first shifter

542: first stage

543: second stage

544: Second Shifter

545: Third Shifter

60: test machine

61: Pedestal

611: connecting plate

612: Fitting surface

613: Channel

62: Displacement sensor

71: circuit board

72: Test Block

73: mounting parts

731: Fitting surface

732: Channel

74: Displacement sensor

Figure 1: The configuration diagram of the conventional operating machine and testing machine.

Figure 2: A schematic diagram of the first embodiment of the present invention.

Figure 3: A partial schematic diagram of Figure 2.

Figure 4: A schematic diagram of the use of the first embodiment of the present invention.

Figure 5: is a partial schematic diagram of Figure 4.

Fig. 6: A diagram of the second embodiment of the present invention.

Figure 7: The top view of Figure 6.

Fig. 8: A diagram of the third embodiment of the present invention.

Figure 9: A diagram of the fourth embodiment of the present invention.

In order to enable your reviewer to have a better understanding of the present invention, a preferred embodiment is given in conjunction with the drawings. The details are as follows: Please refer to Figures 2 and 3, the first embodiment of the present invention discloses a positioning mechanism, including The first substrate 41, the second substrate 42 and the instant detection unit, the first substrate 41 is provided with a plurality of first positioning members 411, the second substrate 42 is provided with a plurality of second positioning members 421, and a plurality of second positioning members 421 For connection With a plurality of first positioning components 411, the real-time detection unit is provided with a bonding surface 422 on the second substrate 42 and a channel 423 communicating with the bonding surface 422. The channel 423 is provided with a displacement sensor 43 for bonding The bonding and assembly status of the bonding surface 422 and the station to be inspected is detected by the displacement sensor 43 to sense the authenticity of the bonding surface 422 and the station to be inspected in real time, so that the workpiece personnel can know the second according to the sensing signal. Whether the substrate 42 is separated from the station to be inspected, and the abnormality can be quickly eliminated.

Furthermore, the channel 423 of the second substrate 42 may be a receiving groove or a through hole, and one end communicates with the bonding surface 422.

Furthermore, the first positioning component 411 and the second positioning component 421 are designed to cooperate with each other for positioning the second substrate 42. For example, the first positioning component 411 is a movable block, and the second positioning component 421 is a stopper. The block and the stop block are locked with each other to position and connect the first base plate 41 to the second base plate 42; for example, the first positioning member 411 is a bolt, and the second positioning member 421 is a screw hole. A substrate 41 is positioned and connected to the second substrate 42; it is not limited to this embodiment.

Furthermore, the displacement sensor 43 can be an eddy current type displacement sensor, a piezoelectric element or a pressure sensor, etc., one end of which is the assembly end and the other end is the sensing end. The sensing end can be used for contact or non-contact standby. Inspection station. In addition, the displacement sensor 43 can be arranged inside or at the end of the channel 423, for example, the displacement sensor 43 is arranged inside the channel 423, for example, one end of the channel 423 is connected to the bonding surface 422, and the displacement sensor 43 is arranged in the channel 423 The other end of the arrangement includes direct arrangement and indirect arrangement. For example, the displacement sensor 43 is placed on the other end of the channel 423 by a frame. Therefore, the arrangement of the displacement sensor 43 is not limited to this embodiment. For example; the displacement sensor 43 transmits the sensing signal to a processor (not shown in the figure), the processor receives the sensing signal and makes an analysis and judgment, and the processor is connected to a display device (such as a screen or a lamp) to For displaying abnormalities; not limited to this embodiment.

Furthermore, the station to be inspected is a part of an object, and relative to the displacement sensor 43, for example, the object is a machine table of a working machine, and the bottom surface of the machine corresponds to a part of the displacement sensor 43 (such as The bottom surface) serves as a station to be inspected.

In this embodiment, the first substrate 41 of the positioning mechanism is an independent plate body, and is provided with a plurality of first positioning components 411 that are movable blocks. The first substrate 41 is assembled on an object that is a working machine 50. The working machine The machine 51 of 50 is provided with a test area, and a through hole 511 is provided in the test area. The peripheral side; the second base plate 42 is an independent plate body, and is provided with a second positioning member 421 at a position corresponding to the first positioning member 411 of the first base plate 41, and the second positioning member 421 is a stopper for the first positioning The component 411 is snap-connected and assembled; the second substrate 42 is assembled on the base 61 of a testing machine 60. The base 61 is for assembling a tester. The tester includes an electrically connected circuit board 71 and a test base 72 with a probe. The test base 72 For holding and testing electronic components; the real-time detection unit is provided with a plurality of channels 423 as accommodating slots on the second substrate 42, one end of the channels 423 is connected to the bonding surface 422, and a displacement sensor 43 is provided inside , The plurality of displacement sensors 43 are eddy current displacement sensors. The assembly end is placed in the channel 423, and the sensing end is close to the bonding surface 422. The bottom surface of the machine 51 is relative to the displacement sensor 43. The position is the station A to be inspected.

Please refer to Figures 4 and 5, the worker moves the testing machine 60 under the machine table 51 of the working machine 50, and makes the test seat 72 relative to the through hole 511 of the test area of the machine table 51, and then moves the test machine 60 in the Z direction , The bonding surface 422 of the second substrate 42 of the positioning mechanism is bonded to the station A to be inspected on the bottom surface of the machine table 51 of the working machine 50. At this time, the sensing end of the displacement sensor 43 of the detection unit is instantly detected Measure at the station A to be inspected on the bottom surface of the machine 51, and use the resistance value of the displacement sensor 43 as the reference resistance value. The second positioning component 421 connects the first substrate 41 to the second substrate 42 to position the second substrate 42, that is, to position the test base 72 and the testing machine 60 through the second substrate 42; During the sub-component testing process, if the second substrate 42 is moved downwards and slightly separated from the machine 51 due to some factors (for example, the first positioning member 411 cannot reliably clamp the second positioning member 421), the test seat will be caused. 72 and the testing machine 60 move downwards synchronously to deviate from the preset assembly position. Since the displacement sensor 43 of the real-time detection unit is located on the second substrate 42, the displacement sensor 43 and the machine 51 will be inspected at the station A Separate, the resistance of the displacement sensor 43 changes during displacement, and outputs an abnormal signal to the processor, so as to sense the separation of the machine 51 and the second substrate 42 in real time, and the processor can display the abnormal state of the device. , So that the staff can know immediately and quickly eliminate the abnormality, thereby improving the quality of the test.

6 and 7, the second embodiment of the present invention discloses a working machine 50, which includes a machine 51, at least one device and a real-time detection unit. The machine 51 is equipped with at least one device for performing preset operations. , The machine 51 is also provided with at least one test area for accommodating the tester, and the tester performs test operations on the electronic components. The real-time detection unit is provided with a bonding surface on the bottom of the test area of the machine 51, and is provided with a communicating sticker The channel of the joint surface, the channel is provided with a displacement sensor, and the position of the machine 51 and the station to be inspected can be sensed in real time by the position The reliability of the fit allows the staff to know in real time whether the working machine 50 is separated from the station to be inspected according to the sensing signal, and the abnormality can be quickly eliminated.

Furthermore, the channel of the machine 51 can be a receiving groove or a through hole, and one end communicates with the bonding surface.

Furthermore, the displacement sensor can be an eddy current type displacement sensor, a piezoelectric element or a pressure sensor. One end is the assembly end and the other end is the sensing end. The sensing end can be used for contact or non-contact to be inspected. Station. In addition, the displacement sensor can be arranged inside or at the end of the channel. The displacement sensor transmits the sensing signal to a processor (not shown). The processor receives the sensing signal and makes an analysis and judgment. The processor Connect a display device (such as a screen or a lamp) for displaying abnormalities; it is not limited to this embodiment.

In this embodiment, the machine 51 has a test area with a through hole 511; the working machine 50 is equipped with a plurality of devices on the machine 51, and the plurality of devices are a feeding device 52, a receiving device 53, and a conveying device. The feeding device 52 At least one supply holder is provided for accommodating at least one electronic component to be tested; the receiving device 53 is provided with at least one receiving holder for accommodating at least one electronic component that has been tested; and the conveying device is provided with at least one A shifter for transferring electronic components. In this embodiment, the conveying device is provided with a first shifter 541. The feeding device 52 takes out the electronic components to be tested, and transfers the electronic components to be tested to the first carrier. A stage 542, a first stage 542 for transferring electronic components to be tested to the side of the test area, a second stage 543 for carrying electronic components that have been tested, a second moving device 544 in the testing area, The first stage 542 and the second stage 543 transfer the electronic components to be tested and the tested electronic components, and the third shifter 545 transfers the tested electronic components of the second stage 543 to the receiving device 53 for storage; The real-time detection unit uses the bottom surface of the test area as the bonding surface 512, and is provided with a plurality of channels 513 as accommodating slots. One end of the channels 513 communicates with the bonding surface 512, and a displacement sensor 514 is provided inside. The displacement sensor 514 is an eddy current displacement sensor, the assembly end of which is embedded in the channel 513, and the sensing end is close to the bonding surface 512; a testing machine 60 is provided with a pedestal 61, the pedestal 61 for assembling at least A tester. The tester includes an electrically connected circuit board 72 and a test base 71. The test base 71 is used to test electronic components; The bonding surface 512 is attached to the inspection station of the testing machine 60, even if the sensing end of the displacement sensor 514 is sensed at the inspection station; in this embodiment, the positioning mechanism is set on the machine table 51 of the working machine 50 A first substrate 41 with a first positioning component 411 is provided, and a second substrate 42 with a second positioning component 421 is set on the base 61 of the testing machine 60. The first substrate 41 is locked and positioned by the first positioning component 411 to position the second substrate 42 The second positioning component 421; the testing machine 60 uses the position of the second substrate 42 relative to the displacement sensor 514 of the machine 51 as the station A to be inspected; however, in the electronic component testing process, if the machine 51 is attached When the surface 512 is slightly separated from the inspection station A of the second substrate 42, the first The displacement of the inspection station A of the two substrates 42 will cause the resistance value of the displacement sensor 514 to change, so as to detect the separation of the machine 51 and the test machine 60 in real time, so that the staff can know and eliminate the abnormality in real time.

Referring to FIG. 8, the third embodiment of the present invention discloses a testing machine 60, which includes a base 61 and a real-time detection unit. The base 61 is for assembling the tester. The channel that communicates with the bonding surface is provided with a displacement sensor. Furthermore, the top surface of the pedestal 61 is used as the bonding surface, or a connecting plate is assembled on the pedestal 61, and the top surface of the connecting plate is used as the bonding surface. The connecting plate has at least one positioning portion, and the positioning portion can be a bolt hole, a clamping block or a clamping hole, etc., and is not limited to this embodiment; when the bonding surface of the pedestal 61 is in a bonding assembly state with the station to be inspected , The displacement sensor is used to sense the authenticity of the fit between the pedestal 61 and the station to be inspected in real time, so that the staff can instantly know whether the testing machine 60 is separated from the station to be inspected according to the sensing signal, and the abnormality can be quickly eliminated.

Furthermore, the passage of the pedestal 61 can be a receiving groove or a through hole, and one end communicates with the bonding surface.

Furthermore, the displacement sensor can be an eddy current type displacement sensor, a piezoelectric element or a pressure sensor. One end is the assembly end and the other end is the sensing end. The sensing end can be used for contact or non-contact to be inspected. Station. In addition, the displacement sensor can be arranged inside or at the end of the channel. The displacement sensor transmits the sensing signal to a processor (not shown). The processor receives the sensing signal and makes an analysis and judgment. The processor Connect a display device (such as a screen or a lamp) for displaying abnormalities; it is not limited to this embodiment.

In this embodiment, the pedestal 61 of the testing machine 60 is equipped with a connecting plate 611, and the real-time detection unit uses the top surface of the connecting plate 611 of the pedestal 61 as the bonding surface 612, and is provided with a plurality of channels 613 as accommodating grooves. One end of 613 communicates with the bonding surface 612, and a displacement sensor 62 is provided inside. The displacement sensor 62 is an eddy current type displacement sensor. The assembly end is embedded in the channel 613, and the sensing end is Close to the bonding surface 612; in addition, a tester is assembled on the base 61 of the tester 60, and the tester contains an electrical connection circuit The board 72 and the test base 71; the machine table 51 of a working machine 50 is located above the test machine 60, and the position of the machine table 51 relative to the displacement sensor 62 of the test machine 60 is the station to be inspected A; The locking method is positioned on the bottom surface of the machine 51, so that the bonding surface 612 of the testing machine 60 is attached to the inspection station A of the machine 51 of the cooperation machine 50, even if the sensing end of the displacement sensor 62 is sensed on the machine The inspection station A of the table 51; however, in the electronic component testing process, if the bonding surface 612 of the testing machine 60 is slightly separated from the inspection station A of the machine 51, the displacement of the displacement sensor 62 will be When the resistance value changes, the instant detection machine 51 is separated from the testing machine 60 for the staff to know and eliminate the abnormality immediately.

Please refer to Figures 6 and 7, again, a test equipment is disclosed, including a working machine 50, a testing machine 60, a real-time detection unit, and a central control device (not shown); it also includes a positioning mechanism; the working machine 50 includes a machine 51 and At least one device, the machine 51 is for assembling at least one device for performing preset operations. In this embodiment, the plural devices are the feeding device 52, the receiving device 53, and the conveying device. The operation of each device is the same as before The above is not repeated; the machine 51 is also provided with at least one test area for accommodating the tester; the tester 60 includes a pedestal 61 and an instant detection unit, the pedestal 61 is for assembling a tester, and the tester performs testing on electronic components Operation. In this embodiment, the tester includes a circuit board 71 and a test base 72 that are electrically connected, and the test base 72 holds and tests electronic components; The first substrate 41 and the second substrate 42 with a second positioning member 421 are set on the pedestal 61 of the testing machine 60, and the first substrate 41 is locked by the first positioning member 411 to position the second positioning member 421 of the second substrate 42; The real-time detection unit is provided with a bonding surface on one of the working machine 50 or the testing machine 60, and is provided with a channel that communicates with the bonding surface. The channel is configured to be equipped with a displacement sensor. The other is provided with a station to be inspected. The position to be inspected is relative to the displacement sensor in the bonding and assembly state of the bonding surface and the station to be inspected. The displacement sensor is used to sense the working machine 50 or the testing machine 60 in real time. Whether to separate for work The personnel quickly eliminate abnormalities based on the sensed signals; the central control device is used to control and integrate the actions of various devices and units to perform automated operations.

Please refer to Figures 7 and 9, the fourth embodiment of the present invention discloses a test equipment, including a working machine 50, a tester, a real-time detection unit and a central control device (not shown); the working machine 50 includes a machine 51 and At least one device, the machine 51 is for assembling at least one device for performing preset operations. In this embodiment, the plural devices are the feeding device 52, the receiving device 53, and the conveying device. The operation of each device is the same as before The above is not repeated; the machine 51 is also provided with at least one test area for accommodating the tester; the tester is assembled on the working machine 50 and includes a mounting member 73, a circuit board 71 and a test base 72, and the mounting member is assembled On the bottom surface of the test area of the machine 51 of the working machine 50, the circuit board 71 and the test socket 72 for electrical connection are provided for the test socket 72 for testing electronic components; the real-time detection unit is in the working machine 50 or the tester One has a bonding surface and a channel communicating with the bonding surface. The channel is used to configure a displacement sensor. The other of the working machine 50 or the tester is equipped with a station to be inspected. The station to be inspected is relative to The displacement sensor uses the displacement sensor to detect whether the working machine 50 or the tester is separated in real time in the bonding and assembly state of the bonding surface and the station to be inspected, so that the staff can quickly eliminate abnormalities based on the sensing signal; In this embodiment, the real-time detection unit is provided with a bonding surface 731 on the mounting member 73 of the tester, and a channel 732 is provided on the bonding surface 731. The channel 732 is used for embedding the displacement sensor 74, and a machine The position of the bottom surface of the test area of 51 relative to the displacement sensor 74 is used as the station A to be inspected. In the assembly state of the bonding surface 731 of the tester and the station A of the machine 51 to be inspected, the displacement sensor is used 74 real-time detection of whether the machine 51 and the mounting member 73 are separated, so that the staff can quickly eliminate abnormalities based on the sensing signal; the central control device is used to control and integrate the actions of various devices and units to perform automated operations.

Furthermore, the displacement sensor of the above-mentioned test equipment can be an eddy current displacement sensor, a piezoelectric element or a pressure sensor, etc., one end of which is the assembly end, the other end is the sensing end, and the sensing end can be used for connection Touch or non-contact station to be inspected. In addition, the displacement sensor can transmit the sensing signal to a processor (not shown in the figure). The processor receives the sensing signal and makes an analysis and judgment. The processor is connected to a display device (such as a screen or a lamp) for Display abnormal; not limited to this embodiment.

41: The first substrate

411: The first positioning component

42: second substrate

421: second positioning component

422: Fitting surface

43: Displacement sensor

A: Station to be inspected

50: working machine

51: Machine

511: Through hole

60: test machine

72: Test Block

Claims (2)

A test equipment includes: a working machine: equipped with a machine, the machine is equipped with at least one test area, and equipped with at least one device for performing preset operations; a tester: assembled on the working machine, including a mounting Components, circuit boards and test sockets, the mounting components are assembled on the bottom surface of the test area of the machine, and the circuit boards and the test sockets are provided for electrical connections, and the test sockets are used for testing electronic components; real-time inspection Unit: A bonding surface is provided on one of the working machine or the tester, and at least one displacement sensor is provided, and a station to be inspected is provided on the other of the working machine or the tester, the The position to be inspected is relative to the displacement sensor, in the bonding and assembly state of the bonding surface and the position to be inspected, the displacement sensor is used to detect in real time whether the working machine and the tester are separated for troubleshooting ; Central control device: for controlling and integrating the actions of various devices and units to perform automated operations. According to the test equipment according to claim 1, the real-time detection unit is provided with a channel communicating with the bonding surface in one of the working machine or the tester, and the channel is used for disposing the displacement sensor.

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