Motion sensing device

Abstract

The present invention provides a motion sensing device, comprising a fixed part, a movable part, a sensing module and a magnetic isolation element. The movable part can move relative to the fixed part, and the sensing module is used to sense the movement of the movable part relative to the fixed part. At least part of the magnetic isolation element is arranged between the fixed part and the movable part.

Description

Technical Field

[0001] The present invention relates to a motion sensing device, and more particularly to a motion sensing device having a magnetic isolation element. Background Art

[0002] An encoder is an electromechanical device that converts rotational position or rotational amount into analog or digital signals. Rotary encoders are used in many applications that require precise rotational position and speed, such as industrial control, robotics, camera lenses, computer input devices (such as mice and trackballs), etc.

[0003] However, when the encoder needs to be miniaturized, conventional encoders will have many problems in operation or storage. Therefore, how to solve the above problems has become an important issue. Summary of the invention

[0004] An object of the present invention is to provide a motion sensing device to solve at least one of the above problems.

[0005] In order to solve the above-mentioned known problems, the present invention provides a motion sensing device, comprising a fixed part, a movable part, a sensing module and a magnetic isolation element. The movable part can move relative to the fixed part, and the sensing module is used to sense the movement of the movable part relative to the fixed part. At least part of the magnetic isolation element is arranged between the fixed part and the movable part.

[0006] In some embodiments of the present invention, the movable part can move around a rotation axis relative to the fixed part, 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 to the magnetic sensing element. The lead component is electrically connected to the circuit component. The shortest distance between the magnetic element and the magnetic sensing element is equal to or less than 1 mm. At least a portion of the magnetic isolation element is disposed between the magnetic element and the magnetic sensing element.

[0007] In some embodiments of the present invention, the magnetic isolation element has a plate-like structure, and when observed along the arrangement direction of the magnetic elements and the magnetic sensing elements, the size of the magnetic isolation element is larger than the size of the magnetic sensing element.

[0008] In some embodiments of the present invention, the magnetic isolation element includes a magnetic isolation layer and a first substrate. The magnetic isolation layer has a magnetic conductive material, and the first substrate is disposed on the magnetic isolation layer. The magnetic isolation layer has a metal material and is flexible. The first substrate has a non-metal material and is flexible. The Young's modulus of the magnetic isolation layer is greater than the Young's modulus of the first substrate. The first substrate is disposed between the magnetic isolation layer and the magnetic sensing element. The thickness of the first substrate is greater than the thickness of the magnetic isolation layer. The thickness of the first substrate is more than one hundred times the thickness of the magnetic isolation layer. When observed along the thickness direction of the magnetic isolation element, the maximum dimension of the first substrate is greater than the maximum dimension of the magnetic isolation layer.

[0009] In some embodiments of the present invention, the magnetic isolation element further comprises a second substrate disposed on the magnetic isolation layer. The second substrate is made of non-metallic material and is flexible. The Young's modulus of the magnetic isolation layer is greater than that of the second substrate. The magnetic isolation layer is disposed between the first substrate and the second substrate.

[0010] In some embodiments of the present invention, the fixing portion includes an opening, and the magnetic isolation element includes a gripping portion, wherein the gripping portion is exposed from the opening. The opening has an arc structure, and the arc structure is formed on a side wall of the fixing portion.

[0011] In some embodiments of the present invention, the circuit assembly has a substantially plate-shaped 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 isolation element is disposed between the cutting side surface and the side wall. The grip portion and the lead assembly both pass through the opening.

[0012] In some embodiments of the present invention, the aforementioned opening has a limiting structure. The limiting structure includes a first limiting surface and a second limiting surface, and the first limiting surface and the second limiting surface both face the magnetic isolation element. The first limiting surface and the second limiting surface face different directions. The first limiting surface and the second limiting 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 magnetic isolation element.

[0013] In some embodiments of the present invention, the motion sensing device further comprises a guiding component for guiding and positioning the magnetic isolation element. The guiding component is disposed on the fixing portion. The guiding component is disposed on the circuit component. The shortest distance between the guiding component and the magnetic isolation element is smaller than the shortest distance between the magnetic sensing element and the magnetic isolation element.

[0014] In some embodiments of the present invention, the motion sensing device further includes a fixed component, and the magnetic isolation element is connected to the fixed part or the movable part via the fixed component. The fixed component includes a first fixed component and a second fixed component. The first fixed component is disposed on the magnetic isolation element and has weak adhesion. The second fixed component is disposed on the magnetic isolation element and has weak adhesion. The first fixed component and the second fixed component are separated and do not directly contact each other. The magnetic sensing element does not directly contact 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 fixed component does not directly contact the magnetic sensing element. The second fixed component does not directly contact the magnetic sensing element. The first fixed component directly contacts the circuit component. The second fixed component directly contacts the opening. The aforementioned first substrate is connected to the circuit component via the fixed component.

[0015] The beneficial effect of the present invention is that the present invention provides a motion sensing device, comprising a fixed part, a movable part, a sensing module and a magnetic isolation element. The movable part can move relative to the fixed part, and the sensing module is used to sense the movement of the movable part relative to the fixed part. At least part of the magnetic isolation element is arranged between the fixed part and the movable part. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 4 is a schematic diagram of a motion sensing device according to an embodiment of the present invention.

[0017] Figure 2 FIG. 1 is a schematic diagram of a motion sensing device according to an embodiment of the present invention, wherein the housing is omitted.

[0018] Figure 3 FIG. 4 is a cross-sectional view of a motion sensing device according to an embodiment of the present invention.

[0019] Figure 4 FIG. 4 is a schematic diagram of a circuit component and a magnetic sensing element in an embodiment of the present invention.

[0020] Figure 5A FIG. 4 is a schematic diagram of a magnetic isolation element in an embodiment of the present invention.

[0021] Figure 5B FIG. 4 is a schematic diagram of a magnetic isolation element in another embodiment of the present invention.

[0022] Figure 6 FIG. 4 is a schematic diagram of a motion sensing device according to another embodiment of the present invention.

[0023] Figure 7 FIG. 4 is a cross-sectional view of a motion sensing device according to another embodiment of the present invention.

[0024] Figure 8 FIG. 4 is a front view of a motion sensing device according to another embodiment of the present invention.

[0025] Fig. 9 FIG. 4 is a schematic diagram of a motion sensing device according to another embodiment of the present invention.

[0026] Fig.10 FIG. 4 is a cross-sectional view of a motion sensing device according to another embodiment of the present invention.

[0027] Fig.11 FIG. 4 is a schematic diagram of a motion sensing device according to another embodiment of the present invention.

[0028] Fig.12 FIG. 4 is a cross-sectional view of a motion sensing device according to another embodiment of the present invention.

[0029] The reference numerals are as follows:

[0030] 10, 20, 30, 40: Motion sensing device

[0031] 100:Fixed part

[0032] 101: Accommodation Space

[0033] 110: Base

[0034] 111:Piercing

[0035] 120: Shell

[0036] 121, 121A, 121B: Open

[0037] 130: Support element

[0038] 140: Locking element

[0039] 200: Movable part

[0040] 210: Bearing element

[0041] 220: Rotating shaft

[0042] 230: Magnetic element fixing seat

[0043] 300:Sensing module

[0044] 310: Circuit assembly

[0045] 311: Cutting side

[0046] 312: Upper surface

[0047] 320: Lead assembly

[0048] 330: Magnetic components

[0049] 340: Magnetic sensing element

[0050] 341: Sensing Surface

[0051] 400: Magnetic isolation element

[0052] 401: Grip

[0053] 410: first substrate

[0054] 420: Magnetic isolation layer

[0055] 430: Second substrate

[0056] 500:Fixed components

[0057] 510: first fixing element

[0058] 520: Second fixing element

[0059] 600: Guiding element

[0060] D: Distance

[0061] R: Rotation axis

[0062] S1: First limit surface

[0063] S2: Second limit surface DETAILED DESCRIPTION

[0064] The following describes the motion sensing device of the present invention. However, it is easy to understand that the present invention provides many suitable inventive concepts that can be implemented in a wide variety of specific contexts. The specific embodiments disclosed are only used to illustrate the use of the present invention in a specific way and are not intended to limit the scope of the present invention.

[0065] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs. It is understood that these terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the background or context of the relevant technology and the present invention, and should not be interpreted in an idealized or overly formal manner unless specifically defined herein.

[0066] First see Figure 1 to Figure 3 In one embodiment of the present invention, the motion sensing device 10 mainly includes a fixed part 100, a movable part 200, a sensing module 300, a magnetic isolation element 400 and a fixed assembly 500. An external driving device (such as a motor) can be connected to the movable part 200 to drive the movable part 200 to rotate around a rotation axis R relative to the fixed part 100, and the sensing module 300 can measure the rotation speed and / or rotation angle of the movable part 200 during its rotation.

[0067] The fixing part 100 includes a base 110, a shell 120, a plurality of supporting elements 130 and a plurality of locking elements 140. The base 110 and the shell 120 can be combined to form a cylindrical body, and a receiving space 101 can be formed inside the cylindrical body to accommodate the movable part 200, the sensing module 300 and the magnetic isolation element 400. In addition, a through hole 111 and an opening 121 communicating with the receiving space 101 are formed on the side walls of the base 110 and the shell 120 of the fixing part 100, respectively.

[0068] The movable part 200 includes at least one bearing element 210, a rotating shaft 220 and a magnetic element fixing seat 230. In this embodiment, the movable part 200 includes two bearing elements 210, which are separately disposed in the through hole 111 of the base 110. In this way, it can be ensured that the rotating shaft 220 extends along the rotating axis R to avoid the occurrence of deflection. The rotating shaft 220 can pass through the aforementioned bearing element 210 to be pivotally connected with the fixed part 100, and can extend into the accommodating space 101 of the fixed part 100. The magnetic element fixing seat 230 can be fixed to 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. Therefore, when the external driving device drives the rotating shaft 220 to rotate around the rotating axis R relative to the fixed part 100, the magnetic element fixing seat 230 will also be driven and rotate relative to the fixed part 100 at the same time.

[0069] The sensing module 300 includes a circuit component 310, a lead component 320, a magnetic element 330, and a magnetic sensing element 340. The circuit component 310 may be, for example, a circuit board, such as Figure 2 to Figure 4 As shown, the circuit assembly 310 generally has a plate-shaped circular structure, and further has a cutting side surface 311 at the opening 121 on the side wall of the corresponding housing 120. It should be particularly noted that the cutting side surface 311 extends along a straight line (such as the X-axis), and a chamfer can be formed between the upper surface 312 (the surface facing the magnetic element fixing seat 230) of the circuit assembly 310 and the cutting side surface 311.

[0070] The circuit assembly 310 can be fixed to the base 110 through the support element 130 and a plurality of locking elements 140. In detail, the two ends of the support element 130 can be connected to the base 110 and the circuit assembly 310 respectively, and then the user can make the locking element 140 pass through the circuit assembly 310 and combine with the support element 130. In this way, the circuit assembly 310 can be firmly fixed to the base 110. The aforementioned locking element 140 can be, for example, a screw, a rivet, or a bolt, but is not limited thereto.

[0071] The lead assembly 320 is disposed on the circuit assembly 310 and electrically connected to the circuit assembly 310, and extends through the opening 121 to be electrically connected to an external circuit. In this embodiment, the opening 121 further extends from the side wall of the housing 120 to the bottom thereof, so that the lead assembly 320 can be accommodated in the opening 121 to reduce the overall size of the motion sensing device 10.

[0072] 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 the surface of the magnetic sensing element 340 facing the magnetic element 330 is a sensing surface 341. The positions of the magnetic element 330 and the magnetic sensing element 340 correspond to each other, and there is a distance D between the two. 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 cm, for example, less than 0.5 cm.

[0073] 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 magnetoresistance effect sensor (TMR Sensor), a giant magnetoresistance effect sensor (GMR sensor), or a magnetoresistance effect sensor (MR sensor).

[0074] When the motion sensing device 10 is small in size, the magnetic sensing element 340 will be very close to the magnetic element 330 (for example, the aforementioned distance D is less than 1 cm). In this case, if the motion sensing device 10 is not used for a long time (for example, during transportation or long-term storage), the magnetic pole of the magnetic element 330 is fixed relative to the magnetic sensing element 340, and the magnetic sensing element 340 may be magnetized by the magnetic element 330, causing the motion sensing device 10 to be unusable. The magnetic isolation element 400 of the motion sensing device 10 in the embodiment of the present invention can be used to avoid the aforementioned situation.

[0075] like Figure 1 to Figure 3As shown, in this embodiment, the magnetic isolation element 400 has a plate-like structure and is flexible. At least a portion of the magnetic isolation element 400 can 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 can extend from between the cutting side surface 311 and the side wall of the housing 120 and pass through the opening 121. The portion of the magnetic isolation element 400 exposed from the opening 121 can be defined as a gripping portion 401.

[0076] In this embodiment, when observing along the arrangement direction (Z-axis direction) of the magnetic element 330 and the magnetic sensing element 340, the size of the magnetic isolation element 330 is larger than the size of the magnetic sensing element 340. In addition, on the rotation axis R, the shortest distance between the magnetic isolation element 400 and the magnetic sensing element 340 is larger than the shortest distance between the magnetic isolation element 400 and the magnetic element 330.

[0077] See also Figure 5A In this 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 isolation layer 420 is disposed faces the magnetic element 330. In other words, the first substrate 410 is located between the magnetic isolation layer 420 and the magnetic sensing element 340, and the magnetic isolation layer 420 is located between the first substrate 410 and the magnetic element 330. The magnetic isolation layer 420 has a metal material, and thus can be used to shield the magnetic field of the magnetic element 330. The first substrate 410 has a non-metal material, such as polyethylene terephthalate (PET), to enhance the strength of the magnetic isolation element 400 and prevent the magnetic isolation layer 420 from breaking when it is bent or deformed.

[0078] Both the first substrate 410 and the magnetic isolation layer 420 are flexible. In this embodiment, in the arrangement direction (Z-axis direction) of the magnetic element 330 and the magnetic sensing element 340, the thickness of the first substrate 410 is greater than the thickness of the magnetic isolation layer 420 (for example, the thickness of the first substrate 410 is more than one hundred times the thickness of the magnetic isolation layer 420), and the Young's modulus of the magnetic isolation layer 420 is greater than the Young's modulus of the first substrate 410. In addition, when observing along the thickness direction (Z-axis direction) of the magnetic isolation element 400, the maximum size of the first substrate 410 is greater than the maximum size of the magnetic isolation layer 420.

[0079] See also Figure 5BIn another embodiment of the present invention, the magnetic isolation element 400 may further include a second substrate 430 disposed on the magnetic isolation layer 420, and the magnetic isolation layer 420 is located 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-metallic material and be flexible, and the Young's modulus of the magnetic isolation layer 420 may be greater than the Young's modulus of the second substrate 430.

[0080] Please go back Figure 3 , the magnetic isolation element 400 can be fixed to the fixed part 100 (or the movable part 200) by using the fixing component 500. In this embodiment, the fixing component 500 includes a first fixing component 510 and a second fixing component 520, both of which are disposed on the magnetic isolation element 400, and the magnetic sensing element 340 is located between the first fixing component 510 and the second fixing component 520. The first fixing component 510 is disposed on the lower surface of the magnetic isolation element 400 and directly contacts the first substrate 410 and the circuit component 310 to fix the first substrate 410 of the magnetic isolation element 400 to the circuit component 310. The second fixing component 520 is disposed on the upper surface of the magnetic isolation element 400 and directly contacts the magnetic isolation element 400 and the inner wall of the opening 121.

[0081] Since both the first fixing element 510 and the second fixing element 520 have weak adhesiveness (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 neither of them contacts the magnetic sensing element 340.

[0082] When the user wants to use the motion sensing device 10, he can first hold the holding portion 401 of the magnetic isolation element 400 exposed from the opening 121, and apply force to pull the magnetic isolation element 400 to move the magnetic isolation element 400 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 sufficient external force, the magnetic isolation element 400 will separate from the fixing portion 100 and move away from between the magnetic element 330 and the magnetic sensing element 340. In this way, the magnetic field of the magnetic element 330 will no longer be shielded. The user can then connect the rotating shaft 220 to an external driving device. When the external driving device rotates, the magnetic sensing element 340 can measure its rotation speed / rotation angle.

[0083] See also Figure 6 to Figure 8In another embodiment of the present invention, the motion sensing device 20 mainly includes a fixed portion 100, a movable portion 200, a sensing module 300, a magnetic isolation element 400 and a fixed assembly 500. The parts of the motion sensing device 20 that have the same structure as the motion sensing device 10 will not be repeated. Unlike the motion sensing device 10, the magnetic isolation element 400 and the lead assembly 320 extend through different openings 121A, 121B on the side wall of the housing 120, and the circuit assembly 310 is generally a complete plate-shaped circular structure without a cut side surface.

[0084] The opening 121A through which the magnetic isolation element 400 passes is substantially aligned with the portion of the magnetic isolation element 400 between the magnetic element 330 and the magnetic sensing element 340. Therefore, the magnetic isolation element 400 can extend horizontally through the opening 121A, thereby reducing the force required by the user to pull the magnetic isolation element 400 and preventing the magnetic isolation element 400 from contacting the corners of other elements and causing breakage when pulling the magnetic isolation element 400.

[0085] like Figure 6 to Figure 8 As shown, the opening 121A has an arc structure and can be formed into a limiting structure. Specifically, the opening 121A includes a first limiting surface S1 and a second limiting surface S2. When the magnetic isolation element 400 passes through the opening 121A, the first limiting surface S1 faces the magnetic isolation element 400, and the second limiting surface S2 faces the magnetic isolation element 400. The first limiting surface S1 and the second limiting surface S2 are arranged along a direction perpendicular to the thickness direction of the magnetic isolation element 400, so they face different directions and are parallel to each other. The distance between the first limiting surface S1 and the second limiting surface S2 is approximately equal to the width of the magnetic isolation element 400 to limit the moving direction of the magnetic isolation element 400.

[0086] See also Fig. 9 and Fig.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 guide assembly 600. The parts of the motion sensing device 30 that are the same as the motion sensing device 10 / motion sensing device 20 will not be described in detail. Different from the motion sensing device 10 / motion sensing device 20, the fixed assembly can be omitted, and an additional guide assembly 600 is added to the circuit assembly 310, and the guide assembly 600 is located between the magnetic sensing element 340 and the opening 121A.

[0087] In this embodiment, the rigidity of the magnetic isolation element 400 can be greater than the rigidity of the magnetic isolation element 400 in the motion sensing device 10 / motion sensing device 20, so it can be a complete plate-shaped structure. When the magnetic isolation element 400 is installed in the motion sensing device 30, the magnetic isolation element 400 will contact the top surface of the guide component 600 and be separated from the magnetic sensing element 340 by a distance. In this structure, the magnetic isolation element 400 will be less likely to break and easier to remove.

[0088] See also Fig.11 and Fig.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 this embodiment, the magnetic element 330 of the sensing module 300 is a ring magnet, and the movable portion includes a rotating shaft (not shown) that can pass through the hole in the center of the ring magnet to connect with the ring magnet.

[0089] The magnetic sensing element 340 of the sensing module 300 is disposed on the fixing portion 100. The magnetic isolation element 400 may be Figure 5A or Figure 5B The multi-layer structure shown may be disposed between the magnetic element 330 and the magnetic sensing element 340 .

[0090] When the user wants to use the motion sensing device 40, he can first hold the holding portion 401 of the magnetic isolation element 400, and apply 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. In this way, the magnetic field of the magnetic element 330 will no longer be shielded. The user can then connect the magnetic element 330 to the external driving device through the movable portion. When the external driving device rotates, the magnetic sensing element 340 can measure its rotation speed / rotation angle.

[0091] In summary, the present invention provides a motion sensing device, comprising a fixed part, a movable part, a sensing module and a magnetic isolation element. The movable part can move relative to the fixed part, and the sensing module is used to sense the movement of the movable part relative to the fixed part. At least part of the magnetic isolation element is disposed between the fixed part and the movable part.

[0092] Although the embodiments of the present invention and their advantages have been disclosed as above, it should be understood that those skilled in the art may make changes, substitutions and modifications without departing from the spirit and scope of the present invention. In addition, the scope of protection of the present invention is not limited to the processes, machines, manufactures, material compositions, devices, methods and steps in the specific embodiments described in the specification. Any technician in the relevant technical field can understand the current or future developed processes, machines, manufactures, material compositions, devices, methods and steps from the disclosure of the present invention. As long as they can implement substantially the same functions or obtain substantially the same results in the embodiments described herein, they can all be used according to the present invention. Therefore, the scope of protection of the present invention includes the above-mentioned processes, machines, manufactures, material compositions, devices, methods and steps. In addition, each claim constitutes a separate embodiment, and the scope of protection of the present invention also includes the combination of each claim and embodiment.

[0093] Although the present invention is disclosed as above with several preferred embodiments, they are not intended to limit the present invention. A person skilled in the art of the present invention may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the attached claims. In addition, each claim constitutes an independent embodiment, and the combination of various claims and embodiments is within the scope of the present invention.

Claims

1. A motion sensing device, comprising: a fixing portion; a movable portion, movable relative to the fixed portion; a sensing module for sensing the movement of the movable part relative to the fixed part; a magnetic isolation element, wherein at least a portion of the magnetic isolation element is disposed between the fixed portion and the movable portion; The sensing module comprises: a magnetic element; and a magnetic sensing element, wherein at least a portion of the magnetic isolation element is disposed between the magnetic element and the magnetic sensing element; The magnetic isolation element comprises: a magnetic isolation layer having a magnetically permeable material; and A first substrate is disposed on the magnetic isolation layer; The magnetic isolation layer is made of metal; The magnetic isolation layer is flexible; The first substrate is made of non-metallic material; The first substrate is flexible; The Young's modulus of the magnetic isolation layer is greater than the Young's modulus of the first substrate; The first substrate is disposed between the magnetic isolation layer and the magnetic sensing element; The thickness of the first substrate is greater than the thickness of the magnetic isolation layer; The thickness of the first substrate is more than one hundred times the thickness of the magnetic isolation layer; When observed along the thickness direction of the magnetic isolation element, the maximum dimension of the first substrate is greater than the maximum dimension of the magnetic isolation layer; The fixing portion includes an opening, and the magnetic isolation element includes a holding portion, which is exposed from the opening.

2. The motion sensing device as claimed in claim 1, wherein the movable portion is movable relative to the fixed portion around a rotation axis, and the sensing module comprises: The magnetic sensing element has a sensing surface facing the magnetic element, wherein the magnetic sensing element includes a magnetoresistive sensing element; a circuit component 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.

3. The motion sensing device as claimed in claim 2, wherein the magnetic isolation element has a plate-like structure, and when observed along the arrangement direction of the magnetic element and the magnetic sensing element, the size of the magnetic isolation element is larger than the size of the magnetic sensing element.

4. The motion sensing device as claimed in claim 2, wherein the magnetic isolation element further comprises: A second substrate is disposed on the magnetic isolation layer; The second substrate is made of non-metal material; The second substrate is flexible; The Young's modulus of the magnetic isolation layer is greater than the Young's modulus of the second substrate; The magnetic isolation layer is arranged between the first substrate and the second substrate. 5 . The motion sensing device as claimed in claim 2 , wherein the opening has an arc structure, and the arc structure is formed on a side wall of the fixing portion.

6. The motion sensing device as claimed in claim 5, wherein the circuit component has a plate-shaped circular structure and has a cut side surface, wherein the cut side surface extends along a straight line, and at least a portion of the magnetic isolation element is disposed between the cut side surface and the side wall; The holding portion and the lead assembly both pass through the opening.

7. The motion sensing device as claimed in claim 5, wherein the opening has a limiting structure, the limiting structure comprising: a first limiting surface facing the magnetic isolation element; as well as a second limiting surface facing the magnetic isolation element; The first limiting surface and the second limiting surface face different directions; The first limiting surface and the second limiting 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 magnetic isolation element.

8. The motion sensing device as claimed in claim 2, wherein the motion sensing device further comprises a guiding component for guiding and positioning the magnetic isolation element; The guide assembly is disposed on the fixing portion; The guiding component is disposed on the circuit component; The shortest distance between the guide component and the magnetic isolation element is smaller than the shortest distance between the magnetic sensing element and the magnetic isolation element.

9. The motion sensing device as claimed in claim 5, wherein the motion sensing device further comprises a fixing component, the magnetic isolation element is connected to the fixed part or the movable part via the fixing component, wherein the fixing component comprises: a first fixing element, disposed on the magnetic isolation element and having weak adhesion; as well as a second fixing element, disposed on the magnetic isolation element and having weak adhesion; The first fixing element and the second fixing element are separated and do not directly contact each other; The magnetic sensing element does not directly contact 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 includes a first substrate, and the first substrate is connected to the circuit component via the fixing component.

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