JP2001133205A - Displacement sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a displacement sensor capable of being miniaturized while securing the insulation function and assembly workability. SOLUTION: The coil side 6A of a differential transformer 6 is constituted by providing a bobbin 14 with first and second coils 20 and 21, putting a shield member 22 on the bobbin 14 so as to cover the first and second coils 20 and 21, and putting a heat shrinkable bobbin tube 23 on the shield member 22. By the bobbin tube 23, insulation between the shield member 22 and a housing 1 is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a displacement sensor for measuring dimensions of components and the like, and more particularly to a displacement sensor using a differential transformer system.

[0002]

2. Description of the Related Art A conventional displacement sensor of this type has a minimum diameter of φ8. When the diameter of the displacement sensor is changed from φ8 to φ6, the displacement sensor can be more closely attached to the machine, and the size of the machine to which the displacement sensor is attached can be further reduced. In addition, since the weight of the movable portion of the displacement sensor must be reduced, the load on the displacement sensor can be reduced, and the displacement sensor can be used for a device that had a large load and could not be measured accurately.

When the diameter of the displacement sensor is changed from φ8 to φ6, the size is simply increased by 3/4 (0.75) and the cross section is set to 0.
It is not only necessary to increase the size by 56 times, but it is necessary to ensure an insulation configuration. Also, it is possible to prevent a reduction in assembly due to downsizing of parts, and in particular, to connect a coil side of a differential transformer and a lead wire of a cable. It is necessary to ensure the workability of the connection.

A conventional displacement sensor has a withstand voltage of 0.8 m.
In order to satisfy a withstand voltage of 1 kV for m / 1 kV,
A distance of about 1 mm was secured. As the outer diameter of the displacement sensor decreases by 2 mm, it is difficult to secure this distance of about 1 mm. In particular, it is necessary to ensure insulation between the housing and the shield member provided on the coil side of the differential transformer. .

FIG. 9 shows a conventional displacement sensor, for example. This displacement sensor has a linear bush 94 and a coil side of a differential transformer 95 provided in a housing 80, and a movable portion 101 having a movable shaft 91 and a core member 89 connected to the movable shaft 91 in the housing 80. Is provided so as to be movable in the axial direction of the housing 80 via the linear bush 94, and the core member 89 is inserted into the coil side of the differential transformer 95 to form the differential transformer 95. The movable part 101 is biased by a not-shown part to project the tip of the movable shaft 91 out of the housing 80, and a contact 93 is provided on the projected part of the movable shaft 91.

[0006] The linear bush 94 is provided with a large number of balls 8 in a peripheral portion in an outer cylindrical body 81 having a long hole 88 in the peripheral portion.
3 is inserted into the ball guide 84, and the rotation stop pin 92 provided on the shaft 91 is
It is inserted into one long hole 88 to prevent the rotation of the movable part 101.

On the coil side of the differential transformer 95, the bobbin 85 is provided with first and second coils 82 and 83, and the bobbin 85 covers the first and second coils 82 and 83. The shield member 86 is covered.

The connection between the first and second coils 82 and 83 of the differential transformer 95 and the lead wire 97 of the cable 96 is based on a plurality of intermediate terminals 98 as shown in FIG. One of the intermediate terminals 98 is soldered to the coil wires of the first and second coils 82 and 83, and the other of the intermediate terminals 98 is soldered to the lead wire 97 of the cable 96 by using the interposed component 100 provided at 99. The insulation was performed by resin filling.

[0009]

However, in the above-described conventional displacement sensor, the shield member 86 is provided.
Insulating tape is attached to the shield member 86 to secure insulation between the housing 80 and the housing 80. In this case,
Wrinkles on the insulating tape make assembly difficult. In some cases, the insulating sheet may be simply wound, but in this case, it is difficult to hold the wound sheet, and it is difficult to assemble the displacement sensor. However, there is a problem that the adaptability of the method significantly lowers the assembling workability.

In the case of the conventional displacement sensor, a plurality of intermediate terminals 98 are connected to the first and second coils 82 and 83 of the differential transformer 95 and the lead wire 97 of the cable 96.
One of the intermediate terminals 98 is soldered to the coil wires of the first and second coils 82 and 83 using the interposed part 100 provided on the base 99, and the other of the intermediate terminals 98 is connected to the lead wire 97 of the cable 96. It is done by soldering.

Since the outer diameter of the displacement sensor is reduced, the connection between the first and second coils 82 and 83 of the differential transformer 95 and the lead wire 97 of the cable 96 needs to be insulated from the housing 80. The conventional connection method and the insulating structure that fills this connection part with resin are troublesome,
There is a problem that adapting to a smaller displacement sensor significantly reduces workability.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a displacement sensor which can be downsized while ensuring a good insulating function and assembling workability. To provide.

[0013]

In order to achieve the above object, a displacement sensor according to the present invention has a linear bush and a coil side of a differential transformer in a housing, and has a movable shaft and a movable shaft in the housing. A movable part having a core member connected to the movable shaft is provided movably in the axial direction of the housing via a linear bush, and the core member is inserted into the coil side of the differential transformer to constitute a differential transformer. Then, the movable part is urged by a spring member provided in the housing to project the tip of the movable shaft out of the housing, a contact is provided on the projected part of the movable shaft, and the coil side of the differential transformer is connected to the lead wire of the cable. A displacement sensor to be connected, wherein the coil side of the differential transformer is provided with a plurality of coils on a bobbin, and the bobbin is sealed so as to cover the coil. Together covered with a member, configured to shield member covered with a dielectric tube, in which so as to ensure insulation between the shield member and the housing by an insulating tube.

The insulating tube includes a heat-shrinkable insulating tube.

With this configuration, when the insulating tube is put on the shield member, the insulating tube does not wrinkle, and the assembly of the differential transformer into the coil side housing can be easily performed. Insulation between the shield member on the coil side of the transformer and the housing can be easily secured. Such good insulation function and assembling workability can be ensured, which can contribute to downsizing of the displacement sensor.

Further, by using a heat-shrinkable insulating tube as the insulating tube, the adhesion of the insulating tube to the shield member is improved, the holding of the insulating tube is ensured, and wrinkles are not generated. As a result, it is possible to easily assemble the differential transformer into the coil side housing.

Further, in order to achieve the above object, a displacement sensor according to the present invention is provided with a linear bush and a coil side of a differential transformer in a housing,
A movable portion having a movable shaft and a core member connected to the movable shaft is provided so as to be movable in the axial direction of the housing via a linear bush, and the core member is inserted into the coil side of the differential transformer to perform differential operation. A movable transformer is urged by a spring member provided in the housing to protrude the distal end of the movable shaft out of the housing, a contact is provided on the projected portion of the movable shaft, and the coil side of the differential transformer is connected to a cable. A displacement sensor adapted to be connected to a lead wire, wherein a coil side of a differential transformer is provided with a plurality of coils on a bobbin, a bobbin is covered with a shield member so as to cover the coil, and the shield member is insulated. Cover the tube with an insulating tube to ensure insulation between the shield member and the housing. Performed in the connection between the lead wire with flexible substrate is and which insulation between the connecting portion and the housing for connecting the lead wires on the flexible substrate so as to secure an insulating member.

With this configuration, when the insulating member is covered with the insulating tube, the insulating tube does not wrinkle, and the differential transformer can be easily assembled to the coil side housing. Insulation between the coil-side shield member and the housing can be easily secured. Also, since the connection between the coil side of the differential transformer and the lead wire of the cable is made using a flexible board, and the connection between the flexible board and the lead wire is insulated from the housing by an insulating member, With this flexible board, not only the connection workability between the coil side and the lead wire is improved, but also the insulation of the connection portion between the flexible board and the lead wire with respect to the housing can be easily ensured.

As described above, it is possible to secure a good insulating function and assembling workability, thereby contributing to downsizing of the displacement sensor.

According to another aspect of the present invention, there is provided a displacement sensor according to the present invention, wherein a flexible substrate is provided on the front and back of one end of the substrate body. A second, third, and fourth cable-side connection pattern portions are provided, and at the other end of the substrate body, a flaky substrate portion that is an extension of the substrate body and a rising substrate portion that rises at a predetermined angle with respect to the substrate body. Forming a shield connection pattern portion on the one-side substrate portion; forming first, second, and third transformer-side connection pattern portions on the rising substrate portion;
The third cable side connection pattern section is connected to the first, second, and third transformer side connection pattern sections via a wiring pattern, and the shield connection pattern section is connected to the fourth cable side connection pattern section via a wiring pattern. To the first, second, third, and fourth cable-side connection patterns,
The terminal portions of the lead wires of the cable are connected by soldering, the terminal side of the coil is connected to the first, second, and third transformer-side connection pattern portions, and the shield connection pattern portion is connected to the shield member. This is a connection between the coil side of the differential transformer and the lead wire of the cable.

With this configuration, it is possible to achieve not only the same operation and effect as the above-described operation and effect of the present invention, but also to improve the workability of the connection side between the coil side of the differential transformer and the shield member and the lead wire of the cable. Therefore, it is possible to contribute to downsizing of the displacement sensor.

According to another aspect of the present invention, there is provided a displacement sensor according to the present invention, wherein the first, second, and third transformer-side connection pattern portions are formed by a rising substrate. The first, second and third terminal pins connected to the terminal side of the coil are provided along the cutout formed at the edge of the portion, and the first and second terminal pins are connected to the coil side of the differential transformer. , And third terminal pins are inserted into the first, second, and third transformer-side connection pattern portions, and are connected by soldering.

With this configuration, not only the same operation and effect as the above-described operation and effect of the present invention can be obtained, but also the first, second, and third terminals connected to the coil side of the differential transformer and the terminal side of the coil. Since the terminal pins are inserted into the first, second, and third transformer-side connection pattern portions and soldered and connected, the workability of the connection portion can be improved.
This can contribute to downsizing of the displacement sensor.

According to a fourth aspect of the present invention, there is provided a displacement sensor according to the present invention, wherein the one-sided board portion on which the shield connection pattern portion of the flexible board is formed is provided on a bobbin. The shield connection pattern portion is connected between the shield member and the shield member.

With this configuration, not only the same operation and effect as the above-described operation and effect of the present invention can be obtained, but also the one-side substrate portion on which the shield connection pattern portion of the flexible substrate is formed is provided between the bobbin and the shield member. By inserting and connecting the coil side of the differential transformer and the shield member to the lead wire of the cable, the workability of the connection portion can be improved, which can contribute to miniaturization of the displacement sensor. .

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a displacement sensor according to the present invention, FIG. 2 (1) is a perspective view of the disassembled state of the displacement sensor,
FIG. 2B is a sectional view taken along line AA of FIG. 2A, FIG. 3 is an exploded perspective view of a differential transformer portion of the displacement sensor,
FIG. 4 is a perspective view of a connection portion between the differential transformer and the cable of the displacement sensor.

The displacement sensor according to the present invention has a tubular housing 1 made of stainless steel.
On the peripheral surface portion 1A, two housing-side rotation stoppers 2 which are located in the middle thereof and project toward the center of the housing 1 are formed with a phase difference of 180 degrees. As shown in FIG. 2 (2), the housing 1 has a projecting portion 3 protruding toward the center of the housing 1. The projecting portion 3 has a planar shape in a direction orthogonal to the axis A of the housing 1. An abutment portion 3A is formed. A cable holding portion 24 is provided at a rear end of the housing 1, and a front end of the cable holding portion 24 is a spring receiving portion 25.

The housing 1 has a linear bush 4 and a detent member 5 from the front to the rear.
And the coil side (bobbin assembly) 6A of the differential transformer 6
, A cable spacer 26 and a bobbin support spring 27 are provided in this order. The linear bush 4 has an outer cylinder 7
Inside, a cylindrical ball guide 9 holding a large number of balls 8 rotatably on its periphery is housed.

The rotation stopping member 5 has a groove 10 formed in the periphery of the cylindrical member main body 5A from the front edge 5a toward the rear, and a rear part of the member main body 5A. A member-side rotation stopper 11 is formed. The member-side rotation stopper 11 has a flat portion 12 formed forward from a rear edge 5b of the member main body 5A, and an upright wall-shaped abutment portion 12A is formed at the front end of the flat portion 12. It is formed. A spring receiving portion 13 is provided at the rear end of the rotation stopping member 5 (see FIG. 1). When the rotation-stopping member 5 is inserted into the housing 1, the protrusion 3 of the housing-side rotation-stopping portion 2 is connected to the flat portion 1 of the member-side rotation-stopping portion 11.
2, the abutment portions 3 and 12 abut each other, and the rotation preventing member 5 is fixed in the housing 1.

The coil side 6A of the differential transformer 6 has a bobbin 1
The bobbin 14 has a front shield fitting portion 15 at a front end portion, and a rear shield fitting portion 16 at a rear end portion.
And a housing contact portion 17 having a diameter larger than that of the rear shield fitting portion 16.
6 and the housing contact portion 17 are grooved coil wire lead-out portions 1
8 are formed in two places. Further, a partition portion 19 is provided at an intermediate portion of the bobbin 14, and the partition portion 1 of the bobbin 14 is provided.
First and second coils 2 connected to each other before and after sandwiching 9
0 and 21 are provided.

The bobbin 14 is covered with a cylindrical shield member 22. That is, the shield member 22 is
The front end is put on the front shield fitting part 15, and the rear end is put on the rear shield fitting part 16 to cover the first and second coils 20 and 21, and attached to the bobbin 14. Further, the shield member 22 is covered with a bobbin tube (insulating tube) 23 made of a heat-shrinkable synthetic resin film (for example, polyimide film). The first, second, and third terminals connected to the connection portions of the first and second coils 20 and 21 and the terminals of the coil terminals are provided at the rear end of the bobbin 14.
Terminal pins 28, 29, 30 project rearward.

When the coil side 6A of the thus configured differential transformer 6 is housed in the housing 1, the front shield fitting portion 15 of the bobbin 14 is fitted to the rear portion of the rotation preventing member 5. The cable spacer 26 is provided on the rear surface of the housing contact portion 17 at the rear end of the bobbin 14.
A bobbin support spring 27 is interposed in a compressed state between the rear end of the cable spacer 26 and the spring receiving portion 25 at the rear end of the housing 1. The urging force of the spring 27 presses the bobbin 14 against the rotation stopping member 5 via the cable spacer 26.

Further, since the bobbin tube 23 is provided on the shield member 22 provided on the coil side 6A of the differential transformer 6, the shield member 22 is provided on the bobbin tube 2A.
3 is insulated from the housing 1.

The first and second coils 2 provided on the bobbin 14
0, 21 and the shield member 22 are flexible substrates 31
Is connected to the cable 43 via the wiring pattern of (1).

That is, the flexible substrate 31 is arranged as shown in FIG.
As shown in FIG. 7 to FIG. 7, the strip-shaped substrate material 31B is folded in two and overlapped, and one end of the substrate material 31B is a flaky substrate portion 3 which is an extension of the substrate material (substrate body 31A) 31B.
7 is formed, the other end of the substrate material 31B is made substantially circular, and this circular portion is raised almost at right angles to the substrate material (substrate main body 31A) 31B to form the rising substrate portion 38A. It has.

The first and second cable-side connection pattern portions 33 and 34 are provided on one surface 31a of the base of the substrate body 31A, and the third and fourth cable-side connection patterns are provided on the other surface 31b. Parts 35 and 36 are respectively formed. In addition, a shield connection pattern portion 39 is formed on the one-side substrate portion 37 at the front of the substrate body 31A.
First, second, and third transformer-side connection pattern portions 40, 41, and 42 are formed on the periphery of the rising substrate portion 38,
The first, second, and third transformer-side connection pattern portions 40, 41, and 42 form a semi-circular shape along the cutouts formed at the edges of the rising substrate portion 38.

The first, second, and third transformer-side connection pattern portions 40, 41, and 42 are connected to the first, second, and third cable-side connection pattern portions 33 via a wiring pattern (not shown). , 34, and 35, and the shield connection pattern portion 39 is connected to the fourth through a wiring pattern (not shown).
Is connected to the cable side connection pattern section 36 of FIG.

The flexible substrate 3 thus configured
1 is connected to first, second, third and fourth lead wires 44, 45, 46 and 47 of the cable 43 on the base side thereof. That is, the first and second cable-side connection pattern portions 33 and 34 provided on the base side of the flexible substrate 31.
The terminal portions of the first and second lead wires 44 and 45 are connected by soldering, and the third and fourth cable-side connection pattern portions 35 and 3 provided on the base side of the flexible substrate 31
The terminal portions of the third and fourth lead wires 46 and 47 are connected by soldering.

The flexible substrate 31 and the bobbin 14
The first and second coils 20 and 21 are connected to the first, second and third terminals connected to the connection portions of the first and second coils 20 and 21 and the terminals of the coil terminals. Pins 28, 2
9 and 30 are inserted into the first, second, and third transformer-side connection pattern portions 40, 41, and 42 of the semi-annular shape, and are connected by soldering. Further, the flaky substrate portion 37 of the flexible substrate 31 on which the shield connection pattern portion 39 is formed.
Is inserted between the rear shield fitting portion 16 of the bobbin 14 and the shield member 22, and the shield connection pattern portion 39 is inserted.
Are soldered to the shield member 22.

An insulating member 70 made of a heat-shrinkable synthetic resin tube is provided at the distal end of the cable 43, and the insulating member 70 is connected to the first and second cables 43 on the base side of the flexible substrate 31. It covers the connection portion F with the second, third, and fourth lead wires 44, 45, 46, 47. The cable 43 is inserted into the rear part of the housing 1, and the insulating member 70 is located inside the cable spacer 26. Therefore, the connection portion F is insulated from the housing 1 by the insulating member 70.

A movable part 50 having a conical coil spring 58 as a spring member and a core member 53 is inserted into the housing 1. The movable portion 50 has a movable shaft 51 and a shaft holder 52 screwed or bonded to the rear end of the movable shaft 51. A rod-shaped core member 53 is provided at the rear end of the shaft holder 52. It is attached by screw connection or bonding.

At the front end of the movable shaft 51, a threaded portion 55A and a ring-shaped boot engaging portion 55 are formed, and at a middle portion of the movable shaft 50, a rear bush 54 for retaining is slid. Fitted movably. The shaft holder 52 has a large-diameter portion 52a, a medium-diameter portion 52b, and a small-diameter portion 52c, and a guide pin 56 is implanted in the large-diameter portion 52a. A rotation stopper ring 57 made of synthetic resin is provided rotatably.

A rear bush 54 is press-fitted into the front end opening 1C of the housing 1, and the movable shaft 51 can be moved in the axial direction with respect to the housing 1 by the rear bush 54 and the linear bush 4. Is held. Then, the guide pin 56 of the rotation stop ring 57
Are slidably inserted into the cut grooves 10 of the rotation stopping member 5. The rear part of the shaft holder 52 penetrates the rear end of the rotation stopping member 5, and the core member 53 connected to the shaft holder 52 is inserted into the bobbin 14. Coil side 6 of dynamic transformer 6
A constitutes the differential transformer 6. Also, the abutment portion 3A of the housing-side rotation stopper 2 is replaced with the member-side rotation stopper 11
The rotation stop member 5 is fixed to the housing 1 by abutting against the abutment portion 12A, and the rotation stop ring 57 of the guide pin 56 of the movable portion 50 is slidably inserted into the cut groove 10 of the rotation stop member 5. By doing so, the movable portion rotation preventing means is configured.

The conical coil spring 58 has a distal end in contact with the rear end of the large diameter portion 52a provided in the shaft holder 52 and a rear end in contact with the spring receiving portion 13 of the rotation stopping member 5, respectively. The force is pushing the movable part 50 forward,
The front end of the movable shaft 51 is
C is projected forward.

The protruding movable shaft 51 has a front and a rear end respectively associated with a boot engaging portion 55 of the movable shaft 51 and a rear bush 54 provided at the front end opening 1C of the housing 1. Stop rubber boots 61
Is provided. Also, at the tip of the movable shaft 51,
A ball holder 59 is attached by screwing to the screw portion 55A.
Holds 0.

Next, the operation of the displacement sensor configured as described above will be described.

After setting this displacement sensor at a predetermined position,
When an alternating current is supplied, the first and second coils 20, 21
, A current flows by electromagnetic induction. When the core member 53 straddles the first and second coils 20 and 21 equally (at the center), the absolute values of the voltages generated in the first and second coils 20 and 21 become equal.

The moving body (not shown) is displaced and interferes with the contact 60 of the displacement sensor, and the movable part 50 is moved by the conical coil spring 5.
8, the core member 53 of the movable portion 50 moves rearward from the center of the bobbin 14 of the differential transformer 6 and is inserted more into the second coil 21 side. Therefore, the voltage induced in the second coil 21 is higher, and the output voltage changes in proportion to the amount of movement of the core member 53. The displacement of the moving body is detected by detecting the amount of change in the output voltage.

According to the above-described embodiment of the present invention, the insulating member, that is, the bobbin tube 23 made of a heat-shrinkable synthetic resin is put on the shield member 22 so that the bobbin tube 23 adheres to the shield member 22. As a result, the bobbin tube 23 is securely held, wrinkles are not generated, and the coil side 6A of the differential transformer 6 can be easily assembled to the housing 1. Therefore, the insulation between the shield member 22 on the coil side 6A of the differential transformer 6 and the housing 1 can be easily secured, the assembling workability is improved, and the size of the displacement sensor can be reduced. .

According to the above-described embodiment of the present invention, the first and second coils 20, 21 and the shield member 22 on the coil side 6A of the differential transformer 6 and the lead wires 45, 46, The connection with 47 and 48 is performed by using the flexible substrate 31, thereby improving the workability of the connection portion. In particular, the first, second, and third transformer-side connection pattern portions 40, 41, and 42 are provided along cutouts formed at the edges of the rising substrate portion 38, and are provided on the coil side 6A of the differential transformer 6. , First and second terminal pins 28 and 2 connected to the terminal sides of the first and second coils 20 and 21, respectively.
9, 30 are projected, and the first, second, and third terminal pins 28,
29, 30 are inserted into the first, second, and third transformer-side connection pattern portions 40, 41, 42, and are connected by soldering.
The workability of the connection between A and the lead wires 44, 45, 46 of the cable 43 can be improved. Further, by covering the connecting portion F between the base of the flexible substrate 31 and the lead wires 45, 46, 47, 48 with an insulating member 70, the connecting portion F
Can be insulated from the housing 1.

[0052]

As described above, according to the displacement sensor of the present invention, since the insulating tube is covered on the shield member on the coil side of the differential transformer, no wrinkles are formed on the insulating tube. The transformer can be easily assembled to the housing on the coil side, and the insulation between the shield member and the housing can be easily ensured.

The connection between the coil side of the differential transformer and the lead wire of the cable is performed using a flexible substrate,
In addition, since the connecting portion between the flexible substrate and the lead wire is insulated from the housing by the insulating member, not only the connection workability between the coil side and the lead wire is improved by this flexible substrate, but also the flexible substrate and the Insulation of the connection portion of the lead wire with respect to the housing can be easily secured.

As described above, it is possible to secure a good insulating function and assembling workability, thereby contributing to downsizing of the displacement sensor.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a displacement sensor according to the present invention.

FIG. 2 is a perspective view of the displacement sensor in an exploded state. FIG. 2B is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of a disassembled state of a differential transformer portion of the displacement sensor.

FIG. 4 is a perspective view of a connection portion of the displacement sensor between a differential transformer and a cable.

FIG. 5 is a plan view of the front side of the flexible substrate.

FIG. 6 is a plan view of the back side of the flexible substrate.

FIG. 7 is a view as seen from a direction B in FIG. 5;

FIG. 8 is an explanatory diagram of a connection state between a coil side of a differential transformer and a flexible substrate.

FIG. 9A is a perspective view of a conventional displacement sensor in an exploded state. (2) is a perspective view of a connection portion between the differential transformer and the cable of the displacement sensor.

[Description of Signs] 1 Housing 1A Peripheral surface 2 Housing rotation stopper (movable part rotation preventing means) 3 Intrusion part (movable part rotation preventing means) 3A Butting part (movable part rotation preventing means) 4 Linear bush 5 Rotation stopper (Movable part rotation prevention means) 6 Differential transformer 6A Coil side 7 Outer cylinder 8 Ball 9 Ball guide 10 Cut groove (Movable part rotation prevention means) 11 Member side rotation stop part (Movable part rotation prevention means) 12 Flat part ( 12A abutment part (movable part rotation preventing means) 13 spring receiving part 14 bobbin (coil side of differential transformer) 15 front shield fitting part 16 rear shield fitting part 17 housing contact part 18 Coil wire deriving unit 19 Partition unit 20 First coil (coil side of differential transformer) 21 Second coil (coil side of differential transformer) 22 Shield unit Material (coil side of differential transformer) 23 Bobbin tube (coil side of differential transformer) (insulating tube) 24 Cable holding part 25 Spring receiving part 26 Cable spacer 27 Bobbin support spring 28 First terminal pin 29 Second terminal Pin 30 Third terminal pin 31 Flexible board 31A Board main body 33 First cable side connection pattern 34 Second cable side connection pattern 35 Third cable side connection pattern 36 Fourth cable side connection pattern 37 One-sided board part 38 rising board part 39 shield connection pattern 40 first transformer side connection pattern 41 second transformer side connection pattern 42 third transformer side connection pattern 43 cable 44 first lead wire 45 second lead wire 46 third Lead wire 47 Fourth lead wire 50 Movable part 51 Movable shuff 52 shaft holder 53 core member 54 the rear bushing 56 guide pins (movable portion side guide portion) 57 rotation stopping ring 58 conical coil spring (spring member) 59 ball holder 60 contacts 61 boots 70 insulating member F connecting portion

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naohisa Inoue Omron Co., Ltd. (10) Hanazono Todocho, Ukyo-ku, Kyoto-shi In-house F-term (reference) 2F063 AA02 AA11 CA18 CA34 DA02 DA05 GA04 GA15 GA30 GA61 2F077 AA00 CC02 FF04 FF12 FF26 VV02 VV33 WW03

Claims (6)

[Claims] A linear bush and a coil side of a differential transformer are provided in a housing, and a movable portion having a movable shaft and a core member connected to the movable shaft is provided in the housing via the linear bush. And the core member is inserted into the coil side of the differential transformer to form a differential transformer, and the movable portion is biased by a spring member provided in the housing. A tip of the movable shaft protruding out of the housing, a contact provided on the projection of the movable shaft, and connecting the coil side of the differential transformer to a lead wire of a cable. The coil side of the differential transformer is provided with a plurality of coils on a bobbin, and the bobbin is provided with a shield portion so as to cover the coil. Together covered with a displacement sensor in which the shield member constituted by covering an insulating tube, characterized in that so as to ensure insulation between the housing and the shield member by the insulation tube. 2. A linear bush and a coil side of a differential transformer are provided in a housing, and a movable portion having a movable shaft and a core member connected to the movable shaft is provided in the housing via the linear bush. And the core member is inserted into the coil side of the differential transformer to form a differential transformer, and the movable portion is biased by a spring member provided in the housing. A tip of the movable shaft protruding out of the housing, a contact provided on the projection of the movable shaft, and connecting the coil side of the differential transformer to a lead wire of a cable. The coil side of the differential transformer is provided with a plurality of coils on a bobbin, and the bobbin is provided with a shield portion so as to cover the coil. And the shield member is covered with an insulating tube, so that the insulating tube ensures insulation between the shield member and the housing, and the coil side of the differential transformer and the cable A displacement sensor characterized in that connection with a lead wire is performed using a flexible board, and insulation between a connection portion for connecting the lead wire to the flexible board and the housing is secured by an insulating member. . 3. The displacement sensor according to claim 1, wherein a heat-shrinkable insulating tube is used as the insulating tube. 4. The flexible board is provided with first, second, third, and fourth cable-side connection pattern portions on the front and back of one end of the board body, and the flexible board is provided on the other end of the board body. Forming a flaky substrate portion that is an extension of the substrate body and a rising substrate portion that rises at a predetermined angle with respect to the substrate body,
A shield connection pattern portion is formed on the one-side substrate portion, and first, second, and third transformer-side connection pattern portions are formed on the rising substrate portion, and the first, second, and third cable-side connection portions are formed. A pattern portion is connected to the first, second, and third transformer-side connection pattern portions via a wiring pattern, and the shield connection pattern portion is connected to the fourth through a wiring pattern.
The first, second, third, and fourth cable-side connection pattern portions are connected by soldering a terminal portion of the lead wire of the cable to the first, second, third, and fourth cable-side connection pattern portions. Connecting the terminal side of the coil to first, second, and third transformer-side connection pattern portions and connecting the shield connection pattern portion to the shield member;
The displacement sensor according to claim 2, wherein the coil side of the differential transformer and the lead wire of the cable are connected. 5. The first, second, and third transformer-side connection pattern portions are provided along cutouts formed at an edge of the rising substrate portion, and are provided on the coil side of the differential transformer. First, second, and third terminals connected to the terminal side of the coil.
5. The terminal pin according to claim 4, wherein said first, second, and third terminal pins are inserted into said first, second, and third transformer-side connection pattern portions and connected by soldering. The displacement sensor as described. 6. The one-piece substrate portion of the flexible substrate on which the shield connection pattern portion is formed is inserted between the bobbin and the shield member to connect the shield connection pattern portion to the shield member. The displacement sensor according to claim 4, wherein