CN114061629A

CN114061629A - Motion sensing device

Info

Publication number: CN114061629A
Application number: CN202010777189.0A
Authority: CN
Inventors: 詹育瑄; 邓为光; 姚柏菘; 粟野良市; 土屋匡广
Original assignee: TDK Taiwan Corp
Current assignee: TDK Taiwan Corp
Priority date: 2020-08-05
Filing date: 2020-08-05
Publication date: 2022-02-18

Abstract

The invention provides a motion sensing device, which comprises a fixed part, a movable part, a sensing module and a magnetism isolating element. The movable part can move relative to the fixed part, and the sensing module is used for sensing the movement of the movable part relative to the fixed part. At least part of the magnetism isolating element is arranged between the fixed part and the movable part.

Description

Motion sensing device

Technical Field

The present invention relates to a motion sensing device. More particularly, the present invention relates to a motion sensing device having a magnetic isolation element.

Background

An encoder is an electromechanical device that converts a rotational position or amount of rotation into an analog or digital signal. Rotary encoders are used in many applications where precise rotational position and speed are required, such as industrial controls, robotics, photographic lenses, computer input devices (e.g., mice and trackballs), and the like.

However, in the situation of miniaturization of the encoder, the conventional encoder has many problems in operation or storage. Therefore, how to solve the above problems becomes an important issue.

Disclosure of Invention

It is an object of the present invention to provide a motion sensing device to address at least one of the above problems.

In order to solve the above-mentioned problems, the present invention provides a motion sensing device, which includes a fixed portion, a movable portion, a sensing module and a magnetic isolation element. The movable part can move relative to the fixed part, and the sensing module is used for sensing the movement of the movable part relative to the fixed part. At least part of the magnetism isolating element is arranged between the fixed part and the movable part.

In some embodiments of the present invention, the movable portion can move around a rotation axis relative to the fixed portion, and the sensing module includes a magnetic element, a magnetic sensing element, a circuit component and a lead component. The magnetic sensing element has a sensing surface facing the magnetic element and includes a magnetoresistive sensing element. The circuit component is electrically connected with the magnetic sensing element. The lead assembly is electrically connected with the circuit assembly. The shortest distance between the magnetic element and the magnetic sensing element is equal to or less than 1 mm. At least part of the magnetism isolating element is arranged between the magnetic element and the magnetic sensing element.

In some embodiments of the present invention, the magnetic shielding element has a plate-shaped structure, and when viewed along the arrangement direction of the magnetic element and the magnetic sensing element, the size of the magnetic shielding element is larger than the size of the magnetic sensing element.

In some embodiments of the present invention, the magnetic isolation element includes a magnetic isolation layer and a first substrate. The magnetic isolation layer is made of magnetic conductivity materials, and the first substrate is arranged on the magnetic isolation layer. The magnetism isolating layer is made of metal materials and has flexibility. The first substrate is made of nonmetal materials and has flexibility. The Young's modulus of the magnetism isolating layer is larger than that of the first substrate. The first substrate is disposed between the magnetic spacer layer and the magnetic sensing element. The thickness of the first substrate is greater than that of the magnetism isolating layer. The thickness of the first substrate is more than one hundred times of that of the magnetism isolating layer. The maximum dimension of the first substrate is larger than the maximum dimension of the magnetism blocking layer when viewed in the thickness direction of the magnetism blocking element.

In some embodiments of the present invention, the magnetic shielding element further includes a second substrate disposed on the magnetic shielding layer. The second substrate is made of nonmetal materials and has flexibility. The Young's modulus of the magnetism isolating layer is larger than that of the second substrate. The magnetism isolating layer is arranged between the first substrate and the second substrate.

In some embodiments of the present invention, the fixing portion includes an opening, and the magnetic shielding element includes a holding portion, wherein the holding portion is exposed from the opening. The opening is provided with an arc structure, and the arc structure is formed on one side wall of the fixing part.

In some embodiments of the present invention, the circuit assembly has a substantially plate-like circular structure and has a cutting side surface, wherein the cutting side surface extends along a straight line, and at least a portion of the magnetic shielding element is disposed between the cutting side surface and the sidewall. The holding portion and the lead assembly pass through the opening.

In some embodiments of the present invention, the opening has a position-limiting structure. The limiting structure comprises a first limiting surface and a second limiting surface, and the first limiting surface and the second limiting surface face the magnetism isolating element. The first and second stop surfaces face in different directions. The first and second stop surfaces are parallel to each other. The first and second limiting surfaces are arranged along a direction perpendicular to the thickness direction of the magnetic shield member.

In some embodiments of the present invention, the motion sensing apparatus further includes a guiding component for guiding and positioning the magnetic shielding element. The guiding component is arranged on the fixing part. The guiding component is arranged on the circuit component. The shortest distance between the guide assembly and the magnetic isolation element is smaller than the shortest distance between the magnetic sensing element and the magnetic isolation element.

In some embodiments of the present invention, the motion sensing apparatus further includes a fixing component, and the magnetic isolation element is connected to the fixing portion or the movable portion through the fixing component. The fixing assembly comprises a first fixing element and a second fixing element. The first fixing element is arranged on the magnetism isolating element and has weak adhesion. The second fixing element is arranged on the magnetism isolating element and has weak adhesion. The first and second fixation elements are separate and not in direct contact with each other. The magnetic sensing element does not directly contact the magnetic shield element. The shortest distance between the magnetic shield element and the magnetic sensing element is greater than the shortest distance between the magnetic shield element and the magnetic element. The first fixing element does not directly contact the magnetic sensing element. The second fixing element does not directly contact the magnetic sensing element. The first fixing member directly contacts the circuit component. The second fixing element directly contacts the opening. The first substrate is connected with the circuit assembly through the fixing assembly.

The present invention provides a motion sensing device, which includes a fixed portion, a movable portion, a sensing module and a magnetic isolation element. The movable part can move relative to the fixed part, and the sensing module is used for sensing the movement of the movable part relative to the fixed part. At least part of the magnetism isolating element is arranged between the fixed part and the movable part.

Drawings

Fig. 1 is a schematic diagram of a motion sensing device according to an embodiment of the invention.

Fig. 2 is a schematic view of a motion sensing device according to an embodiment of the invention, wherein the housing is omitted.

Fig. 3 is a cross-sectional view of a motion sensing device according to an embodiment of the invention.

FIG. 4 is a diagram of a circuit assembly and a magnetic sensing device according to an embodiment of the invention.

FIG. 5A is a diagram of a magnetic shield according to an embodiment of the present invention.

FIG. 5B is a diagram of a magnetic shield according to another embodiment of the present invention.

Fig. 6 is a schematic view of a motion sensing device according to another embodiment of the invention.

Fig. 7 is a cross-sectional view of a motion sensing device in accordance with another embodiment of the present invention.

Fig. 8 is a front view of a motion sensing device according to another embodiment of the invention.

Fig. 9 is a schematic view of a motion sensing device according to another embodiment of the invention.

Fig. 10 is a cross-sectional view of a motion sensing device in accordance with another embodiment of the present invention.

Fig. 11 is a schematic view of a motion sensing device according to another embodiment of the invention.

Fig. 12 is a cross-sectional view of a motion sensing device in accordance with another embodiment of the present invention.

The reference numbers are as follows:

10. 20, 30, 40 motion sensing device

100 fixed part

101, a containing space

110 base

111 through hole

120: shell

121. 121A, 121B openings

130 supporting element

140 locking element

200 moving part

210 bearing element

220: rotating shaft

230 magnetic element holder

300 sensing module

310 circuit assembly

311 cutting flank

312 upper surface

320 lead assembly

330 magnetic element

340 magnetic sensing element

341 sensing surface

400 magnetic isolation element

401 grip part

410 first substrate

420 magnetic isolation layer

430 second substrate

500 fixing assembly

510 first fixing element

520 second fixing element

600 guide element

D is distance

R is a rotating shaft

S1 first Limit surface

S2 second Limit surface

Detailed Description

The motion sensing device of the present invention is explained below. It should be appreciated, however, that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments disclosed are merely illustrative of specific ways to make and use the invention, and do not delimit the scope of the invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present invention and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Referring to fig. 1 to 3, in an embodiment of the invention, a motion sensing apparatus 10 mainly includes a fixed portion 100, a movable portion 200, a sensing module 300, a magnetic isolation element 400, and a fixed assembly 500. An external driving device (e.g., a motor) may be connected to the movable portion 200 to drive the movable portion 200 to rotate around a rotation axis R relative to the fixed portion 100, and the sensing module 300 may measure the rotation speed and/or the rotation angle of the movable portion 200 during the rotation.

The fixing portion 100 includes a base 110, a housing 120, a plurality of supporting members 130, and a plurality of locking members 140. The base 110 and the housing 120 may be combined to form a cylindrical body, and an accommodating space 101 may be formed inside the cylindrical body to accommodate the movable portion 200, the sensing module 300 and the magnetic isolation element 400. In addition, a through hole 111 and an opening 121 communicating with the accommodating space 101 are further formed on the side walls of the base 110 and the housing 120 of the fixing portion 100, respectively.

The movable portion 200 includes at least a bearing element 210, a rotating shaft 220 and a magnetic element holder 230. In the present embodiment, the movable portion 200 includes two bearing elements 210, which are separately disposed in the through hole 111 of the base 110. Thus, the shaft 220 can be ensured to extend along the rotation axis R, and the occurrence of a deflection situation can be avoided. The shaft 220 can pass through the bearing element 210 to pivotally connect with the fixing portion 100, and can extend into the accommodating space 101 of the fixing portion 100. The magnetic element fixing base 230 can be fixed at one end of the rotating shaft 220 located in the accommodating space 101, and the external driving device can be connected to the other end of the rotating shaft 220, so that when the external driving device drives the rotating shaft 220 to rotate around the rotation axis R relative to the fixing portion 100, the magnetic element fixing base 230 is also driven to rotate relative to the fixing portion 100.

The sensing module 300 includes a circuit element 310, a lead element 320, a magnetic element 330, and a magnetic sensing element 340. The circuit component 310 may be, for example, a circuit board, as shown in fig. 2 to 4, the circuit component 310 has a substantially plate-shaped circular structure, and a cutting side 311 corresponding to the opening 121 on the side wall of the housing 120. It should be noted that the cutting side 311 extends along a straight line (e.g., the X-axis), and a chamfer may be formed between the upper surface 312 (the surface facing the magnetic element holder 230) of the circuit assembly 310 and the cutting side 311.

The circuit assembly 310 may be secured to the base 110 by the support member 130 and the plurality of lock members 140. In detail, two ends of the supporting member 130 can be connected to the base 110 and the circuit component 310, respectively, and then the user can make the locking member 140 pass through the circuit component 310 and combine with the supporting member 130. As a result, the circuit element 310 can be firmly fixed to the base 110. The locking member 140 may be, for example, a screw, a rivet, or a bolt, but is not limited thereto.

The lead element 320 is disposed on the circuit element 310 and electrically connected to the circuit element 310, and extends through the opening 121 to electrically connect to an external circuit. In the embodiment, the opening 121 further extends from the sidewall to the bottom of the casing 120, so that the lead assembly 320 can be accommodated in the opening 121 to reduce the overall size of the motion sensing apparatus 10.

The magnetic element 330 and the magnetic sensing element 340 are respectively disposed on the magnetic element fixing base 230 and the circuit assembly 310, and a surface of the magnetic sensing element 340 facing the magnetic element 330 is a sensing surface 341. The magnetic element 330 and the magnetic sensing element 340 are located corresponding to each other and separated by a distance D. For example, the shortest distance between the magnetic element 330 and the magnetic sensing element 340 (i.e., the distance D) may be less than or equal to 1 centimeter, such as less than 0.5 centimeter.

When the rotating shaft 220 of the movable part 200 is connected to an external driving device, and the external driving device drives the magnetic element fixing base 230 and the magnetic element 330 thereon to rotate, the magnetic sensing element 340 can measure the rotation speed/rotation angle of the magnetic element 330 through the change of the magnetic field direction. For example, the magnetic sensing element 340 can be a magnetoresistive sensing element, such as a Tunneling magnetoresistive Effect Sensor (TMR Sensor), a Giant magnetoresistive Effect Sensor (GMR Sensor), or a magnetoresistive Effect Sensor (MR Sensor).

When the motion sensing device 10 is small in size, the magnetic sensing element 340 is in close proximity to the magnetic element 330 (e.g., the distance D is less than 1 cm). In this situation, if the motion sensing device 10 is not used for a long time (e.g. during transportation or long storage), the magnetic poles of the magnetic elements 330 are fixed relative to the magnetic sensing elements 340, and the magnetic sensing elements 340 may be magnetized by the magnetic elements 330, so that the motion sensing device 10 may not be used. The magnetic isolation element 400 of the motion sensing device 10 of the present embodiment can be used to avoid the foregoing situation.

As shown in fig. 1 to 3, in the present embodiment, the magnetic shielding element 400 has a plate-like structure and is flexible. At least a portion of the magnetic isolation element 400 may be disposed between the magnetic element 330 and the magnetic sensing element 340 to shield the magnetic field of the magnetic element 330, thereby preventing the magnetic sensing element 340 from being magnetized. In addition, the magnetic isolation element 400 may further extend from between the cutting side 311 and the sidewall of the housing 120 and through the opening 121. The portion of the magnetic shielding member 400 exposed from the opening 121 can be defined as a holding portion 401.

In the present embodiment, the size of the magnetic shield element 330 is larger than the size of the magnetic sensing element 340 when viewed along the arrangement direction (Z-axis direction) of the magnetic element 330 and the magnetic sensing element 340. In addition, on the rotation axis R, the shortest distance between the magnetism blocking element 400 and the magnetism sensing element 340 is larger than the shortest distance between the magnetism blocking element 400 and the magnetism element 330.

Referring to fig. 5A, in the present embodiment, the magnetic isolation element 400 includes a first substrate 410 and a magnetic isolation layer 420, wherein the magnetic isolation layer 420 is disposed on the first substrate 410. The surface of the first substrate 410 on which the magnetic shielding layer 420 is disposed faces the magnetic element 330, i.e., the first substrate 410 is located between the magnetic shielding layer 420 and the magnetic sensing element 340, and the magnetic shielding layer 420 is located between the first substrate 410 and the magnetic element 330. The magnetism isolating layer 420 has a metal material and thus may serve to shield the magnetic field of the magnetic element 330. The first substrate 410 is made of a non-metal material, such as polyethylene terephthalate (PET), for increasing the strength of the magnetic shielding element 400 and preventing the magnetic shielding layer 420 from being cracked when bent or deformed.

The first substrate 410 and the magnetic isolation layer 420 are flexible. In the present embodiment, in the arrangement direction (Z-axis direction) of the magnetic elements 330 and the magnetic sensing elements 340, the thickness of the first substrate 410 is greater than the thickness of the magnetic shielding layer 420 (for example, the thickness of the first substrate 410 is more than one hundred times the thickness of the magnetic shielding layer 420), and the Young's modulus (Young's modulus) of the magnetic shielding layer 420 is greater than the Young's modulus of the first substrate 410. In addition, the maximum dimension of the first substrate 410 is larger than the maximum dimension of the magnetism blocking layer 420 as viewed along the thickness direction (Z-axis direction) of the magnetism blocking element 400.

Referring to fig. 5B, in another embodiment of the present invention, the magnetic isolating element 400 further includes a second substrate 430 disposed on the magnetic isolating layer 420, and the magnetic isolating layer 420 is disposed between the first substrate 410 and the second substrate 430. The second substrate 430 may be made of the same material as the first substrate 410, so the second substrate 430 may also have a non-metal material and flexibility, and the young's modulus of the magnetic shield layer 420 may be larger than the young's modulus of the second substrate 430.

Referring back to fig. 3, the magnetic shielding element 400 can be fixed to the fixing portion 100 (or the movable portion 200) by a fixing assembly 500. In the present embodiment, the fixing assembly 500 includes a first fixing element 510 and a second fixing element 520, both of which are disposed on the magnetic isolation element 400, and the magnetic sensing element 340 is located between the first fixing element 510 and the second fixing element 520. The first fixing element 510 is disposed on the lower surface of the magnetic isolation element 400 and directly contacts the first substrate 410 and the circuit assembly 310, so as to fix the first substrate 410 of the magnetic isolation element 400 to the circuit assembly 310. The second fixing element 520 is disposed on the upper surface of the magnetic shielding element 400 and directly contacts the magnetic shielding element 400 and the inner wall of the opening 121.

Since the first fixing element 510 and the second fixing element 520 both have weak adhesion (e.g., glue), the magnetic isolation element 400 can be fixed between the magnetic element 330 and the magnetic sensing element 340 by using the first fixing element 510 and the second fixing element 520. It should be noted that the first fixing element 510 and the second fixing element 520 are separated from each other, and both of them do not contact the magnetic sensing element 340.

When the user wants to use the motion sensing device 10, he or she can first hold the holding portion 401 of the magnetic shielding element 400 exposed from the opening 121, and then apply a force to pull the magnetic shielding element 400, so that the magnetic shielding element 400 moves in a direction away from the accommodating space 101. Since the first fixing element 510 and the second fixing element 520 have only weak adhesion, when the user applies a sufficient external force, the magnetic shielding element 400 is separated from the fixing portion 100 and moves away from between the magnetic element 330 and the magnetic sensing element 340. As such, the magnetic field of the magnetic element 330 is no longer shielded. The user may then connect the shaft 220 to an external driving device. When the external driving device rotates, the magnetic sensing element 340 can measure the rotation speed/rotation angle thereof.

Referring to fig. 6 to 8, in another embodiment of the present invention, the motion sensing apparatus 20 mainly includes a fixing portion 100, a movable portion 200, a sensing module 300, a magnetic isolation element 400, and a fixing assembly 500. The same structure of the motion sensing device 20 and the motion sensing device 10 will not be described in detail. Unlike the motion sensing device 10, the magnetic isolation element 400 and the lead assembly 320 extend through

distinct openings

121A, 121B in the side wall of the housing 120, and the circuit assembly 310 is a substantially complete plate-like circular structure without cut sides.

The opening 121A through which the magnetic shield 400 passes is positioned to be approximately aligned with the portion of the magnetic shield 400 between the magnetic element 330 and the magnetic sensing element 340. Therefore, the magnetic isolation element 400 can horizontally extend through the opening 121A, so as to reduce the force required by a user pulling the magnetic isolation element 400 and avoid the fracture of the magnetic isolation element 400 caused by contacting the corners of other elements when the magnetic isolation element 400 is pulled.

As shown in fig. 6 to 8, the opening 121A has a circular arc structure and can be formed as a limiting structure. Specifically, the opening 121A includes a first stopper surface S1 and a second stopper surface S2. When the magnetism isolating element 400 passes through the opening 121A, the first stopper surface S1 faces the magnetism isolating element 400, and the second stopper surface S2 faces the magnetism isolating element 400. The first and second stopper surfaces S1 and S2 are aligned in a direction perpendicular to the thickness direction of the magnetic shield element 400, and thus will face different directions and be parallel to each other. The distance between the first and second stopper surfaces S1 and S2 is substantially equal to the width of the magnetism isolating member 400 to limit the moving direction of the magnetism isolating member 400.

Referring to fig. 9 and 10, in another embodiment of the present invention, the motion sensing device 30 mainly includes a fixed portion 100, a movable portion 200, a sensing module 300, a magnetic isolation element 400, and a guiding assembly 600. The same structure of the motion sensing device 30 and the motion sensing device 10/20 will not be described in detail. Unlike the motion sensing device 10/motion sensing device 20, the fixing element can be omitted, and a guiding element 600 is additionally added to the circuit element 310, and the guiding element 600 is located between the magnetic sensing element 340 and the opening 121A.

In this embodiment, the magnetic isolation element 400 may have a rigidity greater than that of the magnetic isolation element 400 in the motion sensing device 10/20, and thus may have a complete plate-like structure. When the magnetism isolating member 400 is installed in the motion sensing apparatus 30, the magnetism isolating member 400 contacts the top surface of the guide member 600 and is separated from the magnetic sensing member 340 by a distance. In this configuration, the magnetic shield 400 will be less likely to break and easier to remove.

Referring to fig. 11 and 12, in another embodiment of the present invention, the motion sensing device 40 mainly includes a fixed portion 100, a movable portion, a sensing module 300 and a magnetic isolation element 400. In the embodiment, the magnetic element 330 of the sensing module 300 is a magnetic ring (ring magnet), and the movable portion includes a shaft (not shown) that can pass through a hole in the center of the magnetic ring to connect with the magnetic ring.

The magnetic sensing element 340 of the sensing module 300 is disposed on the fixing portion 100. The magnetic isolation element 400 may be formed of a multi-layer structure as shown in FIG. 5A or FIG. 5B, and may be disposed between the magnetic element 330 and the magnetic sensing element 340.

When the user wants to use the motion sensing device 40, he or she can first hold the holding portion 401 of the magnetic isolation element 400 and apply a force to pull the magnetic isolation element 400, so that the magnetic isolation element 400 is separated from between the magnetic element 330 and the magnetic sensing element 340. As such, the magnetic field of the magnetic element 330 is no longer shielded. The user may then connect the magnetic element 330 to an external drive device through the movable portion. When the external driving device rotates, the magnetic sensing element 340 can measure the rotation speed/rotation angle thereof.

In summary, the present invention provides a motion sensing device, which includes a fixed portion, a movable portion, a sensing module and a magnetic isolation element. The movable part can move relative to the fixed part, and the sensing module is used for sensing the movement of the movable part relative to the fixed part. At least part of the magnetism isolating element is arranged between the fixed part and the movable part.

Although embodiments of the present invention and their advantages have been disclosed, it should be understood that various changes, substitutions and alterations can be made herein by those skilled in the art without departing from the spirit and scope of the invention. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification, but it is to be understood that any process, machine, manufacture, composition of matter, means, method and steps, presently existing or later to be developed, that will become apparent to those skilled in the art from this disclosure, may be utilized according to the present invention, and that all the same functions or advantages of the disclosed embodiments may be accomplished by the present invention. Accordingly, the scope of the present application includes the processes, machines, manufacture, compositions of matter, means, methods, and steps described in the specification. In addition, each claim constitutes a separate embodiment, and the scope of protection of the present invention also includes combinations of the respective claims and embodiments.

While the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims. Furthermore, each claim constitutes a separate embodiment, and combinations of various claims and embodiments are within the scope of the invention.

Claims

1. A motion sensing apparatus comprising:

a fixed part;

a movable part, which can move relative to the fixed part;

a sensing module for sensing the movement of the movable part relative to the fixed part; and

and at least part of the magnetism isolating element is arranged between the fixed part and the movable part.

2. The motion sensing apparatus of claim 1, wherein the movable portion is movable relative to the fixed portion about a rotation axis, and the sensing module comprises:

a magnetic element;

a magnetic sensing element having a sensing surface facing the magnetic element, wherein the magnetic sensing element comprises a magnetoresistive sensing element;

a circuit assembly electrically connected to the magnetic sensing element; and

a lead assembly electrically connected to the circuit assembly;

the shortest distance between the magnetic element and the magnetic sensing element is equal to or less than 1 mm;

at least part of the magnetic isolation element is arranged between the magnetic element and the magnetic sensing element.

3. The motion sensing apparatus according to claim 2, wherein the magnetism blocking member has a plate-like structure, and a size of the magnetism blocking member is larger than a size of the magnetism sensing member as viewed along an arrangement direction of the magnetism sensing member and the magnetism sensing member.

4. The motion sensing apparatus of claim 2, wherein the magnetic isolation element comprises:

a magnetic isolation layer made of magnetic material; and

the first substrate is arranged on the magnetism isolating layer;

the magnetic isolation layer is made of metal material;

the magnetic isolation layer has flexibility;

the first substrate is made of non-metal materials;

the first substrate has flexibility;

the Young modulus of the magnetism isolating layer is larger than that of the first substrate;

the first substrate is arranged between the magnetism isolating layer and the magnetic sensing element;

the thickness of the first substrate is larger than that of the magnetism isolating layer;

the thickness of the first substrate is more than one hundred times of that of the magnetic isolation layer;

the maximum dimension of the first substrate is larger than the maximum dimension of the magnetism isolating layer when viewed along the thickness direction of the magnetism isolating element.

5. The motion sensing apparatus of claim 4, wherein the magnetic isolation element further comprises:

the second substrate is arranged on the magnetism isolating layer;

the second substrate is made of non-metal materials;

the second substrate has flexibility;

the Young modulus of the magnetism isolating layer is larger than that of the second substrate;

the magnetic isolation layer is arranged between the first substrate and the second substrate.

6. The motion sensing apparatus of claim 2, wherein the fixing portion comprises an opening, and the magnetic isolation element comprises a holding portion, wherein the holding portion is exposed from the opening;

the opening is provided with an arc structure, and the arc structure is formed on one side wall of the fixing part.

7. The motion sensing device of claim 6, wherein the circuit assembly has a substantially plate-like circular configuration and has a cutting side, wherein the cutting side extends along a straight line, and at least a portion of the magnetic isolation element is disposed between the cutting side and the sidewall;

the holding portion and the lead assembly both pass through the opening.

8. The motion sensing apparatus of claim 6, wherein the opening has a limiting structure, the limiting structure comprising:

a first limiting surface facing the magnetic isolation element; and

a second limiting surface facing the magnetic isolation element;

the first and second stop surfaces face in different directions;

the first stop surface and the second stop surface are parallel to each other;

the first limiting surface and the second limiting surface are arranged along a direction, and the direction is perpendicular to the thickness direction of the magnetism isolating element.

9. The motion sensing apparatus of claim 2, wherein the motion sensing apparatus further comprises a guiding element for guiding and positioning the magnetic isolation element;

the guiding component is arranged on the fixing part;

the guiding component is arranged on the circuit component;

the shortest distance between the guide component and the magnetism isolating element is smaller than the shortest distance between the magnetic sensing element and the magnetism isolating element.

10. The motion sensing apparatus of claim 6, wherein the motion sensing apparatus further comprises a fixing component, the magnetic isolation element is connected to the fixing portion or the movable portion via the fixing component, wherein the fixing component comprises:

a first fixing element arranged on the magnetism isolating element and having weak adhesiveness; and

the second fixing element is arranged on the magnetism isolating element and has weak adhesiveness;

the first and second fixation elements are separate and not in direct contact with each other;

the magnetic sensing element is not directly contacted with the magnetic isolation element;

the shortest distance between the magnetic isolation element and the magnetic sensing element is greater than the shortest distance between the magnetic isolation element and the magnetic element;

the first fixing element does not directly contact the magnetic sensing element;

the second fixing element does not directly contact the magnetic sensing element;

the first fixing element directly contacts the circuit component;

the second fixing element directly contacts the opening;

the magnetic isolation element comprises a first substrate, and the first substrate is connected with the circuit component through the fixing component.