Rolling assembly and electronic device

Abstract

A rolling assembly for an electronic device and an electronic device including the rolling assembly are disclosed. The electronic device includes: a housing containing electronic components; and the rolling assembly. The rolling assembly includes: a rolling mechanism rotatably mounted to the housing of the electronic device, wherein at least a portion of the rolling mechanism is exposed outside the housing; a magnet disposed in the rolling mechanism; and at least one magnetic sensor fixedly mounted inside the housing of the electronic device, magnetically coupled to the magnet through the housing therebetween, and configured to detect the magnetic field of the magnet in a non-contact manner.

Description

Technical Field

[0001] This disclosure generally relates to rolling assemblies for electronic devices and electronic devices including rolling assemblies. Background Technology

[0002] Scrolling mechanisms in electronic devices (such as mechanical rollers or rolling wheels) are known for their simple structure and the clear tactile feedback they provide. Tactile feedback is particularly beneficial for blind users who rely on physical feedback for control. However, integrating scrolling mechanisms into electronic devices often requires physical openings or holes in the device's casing. These openings or holes compromise the integrity of the casing, posing a significant challenge to maintaining the device's waterproof and dustproof capabilities.

[0003] Attempts have been made to address these challenges, but these solutions typically involve complex designs. Such designs not only increase manufacturing costs but are also less suitable for portable and compact electronic devices where simplicity and ease of use are crucial.

[0004] Therefore, an improved rolling mechanism is needed to overcome at least some of these limitations. Summary of the Invention

[0005] According to one aspect of this disclosure, a rolling assembly for an electronic device including a housing is provided. The rolling assembly includes: a rolling mechanism rotatably mounted to the housing of the electronic device, wherein at least a portion of the rolling mechanism is exposed outside the housing; a magnet disposed within the rolling mechanism; and at least one magnetic sensor fixedly mounted inside the housing of the electronic device, magnetically coupled to the magnet through the housing therebetween, and configured to detect the magnetic field of the magnet in a non-contact manner.

[0006] According to another aspect of this disclosure, an electronic device is provided. The electronic device includes: a housing containing electronic components; and a rolling assembly according to any one of claims 1 to 13. Attached Figure Description

[0007] This disclosure will be better understood with reference to the following figures and description. The components shown in the figures are not necessarily drawn to scale, but rather the principles illustrated in this disclosure are intended to be emphasized. Furthermore, in the figures, the same reference numerals denote the same parts throughout the figures.

[0008] Figure 1 An electronic device according to one or more embodiments of the present disclosure is shown;

[0009] Figure 2A An exploded view of an electronic device according to one or more embodiments of the present disclosure is shown;

[0010] Figure 2B An exploded view of a rolling assembly according to one or more embodiments of the present disclosure is shown;

[0011] Figure 3A yes Figure 1 A magnified view of the scroll assembly;

[0012] Figure 3B It is along Figure 3A A cross-sectional view taken from line 3B-3B;

[0013] Figure 3C It is along Figure 3A A cross-sectional view taken from line 3C-3C;

[0014] Figure 4 A side view of a rolling assembly connected to a housing of an electronic device according to one or more embodiments of the present disclosure is shown;

[0015] Figure 5 It shows along Figure 3C The cross-sectional view taken from line 5-5. Detailed Implementation

[0016] Various embodiments of this disclosure will be described in more detail below with reference to the accompanying drawings.

[0017] As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context explicitly indicates otherwise. As used herein, the terms “comprise,” “comprising,” “include,” and / or “including” specify the presence of the stated feature, integer, step, operation, element, and / or component, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof. As used herein, the terms “and / or” and the symbol “ / ” signify any and all combinations including one or more of the associated listed items. Furthermore, while the terms “first,” “second,” etc., may be used herein to describe various elements, components, steps, or calculations, these elements, components, steps, or calculations should not be limited by these terms, but rather these terms are used only to distinguish one element, component, step, or calculation from another. For example, a first component may be referred to as a second component; similarly, a first calculation may be referred to as a second calculation; likewise, a first step may be referred to as a second step; all of these do not depart from the scope of this disclosure.

[0018] For the purpose of clarifying its use in pending claims and to provide notice to the public, unless expressly stated to the contrary by the applicant, the phrase "in lieu of any other implied definition above or below" shall apply., ... and <n> at least one of them or< / n> 、、......、 <n>"or at least one of their combinations" is defined most broadly by the applicant as meaning one or more elements selected from the group consisting of A, B, ... and N, that is, any combination of one or more elements A, B, ... or N that includes any single element or a combination of one or more elements with other elements (which may also include additional elements not listed).

[0019] This disclosure provides a rolling assembly for an electronic device and an electronic device including the rolling assembly. The rolling assembly includes: a rolling mechanism rotatably mounted to a housing of the electronic device, wherein at least a portion of the rolling mechanism is externally accessible; a magnet disposed in the rolling mechanism; and at least one magnetic sensor fixedly mounted inside the housing of the electronic device and magnetically coupled to the magnet through the housing therebetween.

[0020] A magnetic sensor, magnetically coupled to a magnet, can detect changes in the magnetic field from the magnet as the rolling mechanism rotates. This allows the electronics to determine the rotation of the rolling roller. Furthermore, this design, where the magnetic sensor is separated from the rolling roller (magnet) by the housing, eliminates the need for physical openings or holes in the housing, as is present in conventional rolling mechanisms. Therefore, this design maintains the integrity of the housing and enhances the waterproof and dustproof performance of the electronics.

[0021] In one or more embodiments, the rolling assembly includes two magnetic sensors. Both sensors are magnetically coupled to a magnet through a housing and are spaced apart from each other, and are in the same plane as the magnet, perpendicular to the axis of rotation of the rolling mechanism. In one or more embodiments, the magnet is positioned and oriented such that its magnetic poles (extending from the North Pole to the South Pole) are perpendicular to the axis of rotation of the rolling mechanism.

[0022] This arrangement allows the magnetic sensors to receive signals from the different magnetic field changes of the magnet as the rolling mechanism rotates. Therefore, the electronic device can more accurately confirm the rotational movement of the rolling roller by analyzing and cross-validating the different signals received by the two sensors, thus helping to prevent false detections.

[0023] < / n> Figure 1 An electronic device 100 according to one or more embodiments of the present disclosure is shown. The electronic device 100 includes a housing 110 and a rolling assembly 130 rotatably mounted to the housing 110, the housing containing electronic components such as a controller (not shown). In operation, a user can control the electronic device 100 by rotating the rolling rollers of the rolling assembly 130. In the illustrated embodiment, the electronic device 100 is a portable speaker, and the rolling assembly 130 is used to adjust the volume of the speaker. The housing 110 of the portable speaker typically has a series of holes or openings in its front and / or rear surfaces to allow sound to be emitted from within; for simplicity and clarity, Figure 1 These holes or openings are omitted. In one or more other embodiments, the electronic device 100 can be any suitable electronic device, wherein the scrolling assembly is used to perform various adjustments, such as adjusting the brightness of a screen or light, or changing the operating mode. In the illustrated embodiment, the scrolling assembly 130 includes scrolling rollers. In one or more other embodiments, the scrolling assembly 130 can include any suitable scrolling mechanism, such as a roller.

[0024] Figure 2A An exploded view of the electronic device 100 is shown, and Figure 2B An exploded view of the rolling assembly 130 is shown. The rolling assembly 130 includes a rolling roller 132, a bottom cover 160, a flexible PCB 170, and a haptic feedback auxiliary assembly 180. The rolling roller 132 includes a rolling roller body 134, a magnet 136, two end pieces 142 and 142', two rotating shafts 152 and 152', and gears mounted on the rotating shafts 152. The haptic feedback auxiliary assembly 180 includes a base 182, a sealing ring 184, and a spring clip 186.

[0025] Figure 3A yes Figure 1 A magnified view of the scroll assembly 130. Figure 3B It is along Figure 3A The cross-sectional view taken from line 3B-3B, and Figure 3C It is along Figure 3A The cross-sectional view taken from line 3C-3C.

[0026] like Figure 3BAs shown, the rolling assembly 130 includes a rolling roller 132, which includes a rolling roller body 134 and a magnet 136 located within the rolling roller body 134. The rolling roller body 134 further includes an outer layer 134a made of an elastomeric material (such as rubber). The magnet 136 is positioned and oriented such that its magnetic pole direction (extending from the north (N) pole to the south (S) pole) is perpendicular to the axis of rotation of the rolling roller 132. The rolling roller 132 is externally mounted on the housing 110 of the electronic device 100 and positioned adjacent to the outer surface of the housing 110. The rolling assembly 130 further includes a flexible PCB 170 on which two magnetic sensors 172, 174 are mounted. The flexible PCB 170 with the magnetic sensors 172, 174 is mounted inside the housing 110 and adjacent to the inner surface of the housing 110. This arrangement places magnetic sensors 172 and 174 close to the rolling roller 132 (magnet 136), but separated from it by the housing 110. Therefore, as the rolling roller 132 rotates, the magnetic field generated by the magnet 136 also rotates, allowing the magnetic sensors 172 and 174 to sense changes in the magnetic field that are correlated with the rotation of the rolling roller 132. Thus, the controller of the electronic device 100 can determine the rotation of the rolling roller 132 by analyzing the signals detected by the magnetic sensors 172 and 174. At the same time, this configuration, where the magnetic sensors 172 and 174 are close to the rolling roller 132 (magnet 136) but separated from it by the housing 110, eliminates the need for physical openings or holes in the housing as is required in conventional rolling rollers. This design maintains the integrity of the housing 110 and enhances the waterproof and dustproof performance of the electronic device 100.

[0027] like Figure 3B As shown, magnetic sensors 172 and 174 are spaced apart from each other and positioned at an angle α relative to the axis of rotation of the rolling roller 132. This arrangement allows magnetic sensors 172 and 174 to receive dissimilar magnetic field change signals from magnet 136 as the rolling roller 132 rotates. By analyzing and cross-validating the dissimilar signals received by sensors 172 and 174, the controller of the electronic device 100 can more accurately confirm the rotational movement of the rolling roller 132. Therefore, this arrangement helps prevent false detections, allowing for more accurate and precise determination of the rotation of the rolling roller 132, such as its direction and rate of rotation. Furthermore, as shown, the rolling assembly 130 has a simple and compact structure. Therefore, it offers the advantages of being cost-effective and suitable for use in compact electronic devices.

[0028] In the illustrated embodiment, magnet 136 is oriented such that its magnetic poles are perpendicular to the axis of rotation of rolling roller 132. Both magnet 136 and magnetic sensors 172, 174 are located in the same plane perpendicular to this axis of rotation, and magnetic sensors 172, 174 are substantially equidistant from the axis of rotation of rolling roller 132. This disclosure is not limited to this configuration. In one or more other embodiments, magnet 136 and magnetic sensors 172, 174 may be positioned and oriented differently, as long as magnetic sensors 172, 174 can detect changes in the magnetic field from magnet 136 as rolling roller 132 rotates.

[0029] In one or more embodiments of this disclosure, the rolling assembly 130 includes two spaced-apart magnetic sensors 172, 174 for detecting changes in the magnetic field from the magnet 136. In one or more embodiments, the magnetic sensors 172 and 174 are spaced from the magnet 136 by a distance D1 of 3 mm to 15 mm, 3 mm to 10 mm, 4 mm to 6 mm, or about 5 mm. In one or more embodiments, the magnetic sensors 172 and 174 are positioned relative to the axis of rotation of the rolling roller 132 at an angle α, which is in the range of 30 degrees to 150 degrees, 60 degrees to 120 degrees, or about 90 degrees. In one or more other embodiments, the rolling assembly 130 may include other numbers of magnetic sensors, such as one or three spaced-apart magnetic sensors, for detecting changes in the magnetic field from the magnet 136. In one or more embodiments, the magnetic sensors 172, 174 may be Hall sensors. In some other embodiments, the magnetic sensors 172, 174 may be any suitable magnetic sensors, as long as they can sense changes in the magnetic field of the magnet 136.

[0030] Figure 3C It is along Figure 3A The cross-sectional view is taken along line 3C-3C. As shown, the rolling roller 132 includes a rolling roller body 134 that is substantially hollow cylindrical in shape, and a magnet 136 located within the hollow cylinder of the rolling roller body 134. The rolling roller body 134 includes an outer layer 134a made of an elastomeric material, and a stop portion 134b integrally formed with the roller body 134 and extending from the roller body 134 into the hollow interior of the hollow cylinder.

[0031] The rolling roller 132 further includes two end members 142, 142', each end member being mounted to one end of the rolling roller body 134. Each of the end members 142, 142' has a rod portion 144, 144' extending into the hollow interior of the hollow cylinder of the roller body 134. The rod portion 144, 144' of one end member 142, 142' presses against the stop portion 134b, while the rod portion 144, 144' of the other end member 142, 142' presses the magnet 136 against the stop portion 134b. This ensures a safe and stable assembly of the end members 142, 142', the roller body 134, and the magnet 136.

[0032] The rolling roller 132 further includes two rotating shafts 152, 152', each rotating shaft being mounted to or integrally formed with one of the two end pieces 142, 142' of the rolling roller 132. The rolling assembly 130 further includes a bottom cover 160. The two rotating shafts 152, 152' are fitted into corresponding openings in the bottom cover 160, thereby allowing the rolling roller 132 to be rotatably connected to the bottom cover 160. This arrangement facilitates easy mounting of the combined assembly of the rolling assembly 130 and the bottom cover 160 onto the housing 110 of the electronic device 100.

[0033] The rolling roller 132 further includes elastic layers 154, 154' that wrap around and are securely attached to the radial exterior of the rotating shafts 152, 152'. In some embodiments, these elastic layers 154, 154' are formed of rubber. The addition of the elastic layers 154, 154' enhances the sealing properties and reduces vibration noise. This reduction in vibration noise is particularly beneficial for embodiments of the electronic device 100 that act as a portable speaker in which such noise could adversely affect sound quality. Thus, the elastic layers 154, 154' contribute to the overall acoustic performance of the electronic device 100 by mitigating unwanted vibrations and noise.

[0034] The rolling assembly 130 further includes a haptic feedback assist assembly 180, which includes a base 182, a sealing ring 184, and a spring clip 186, to be referenced. Figure 5 Describe their details.

[0035] Figure 3CA specific structure of the rolling assembly 130 according to one or more embodiments of the present disclosure is shown. In one or more other embodiments, the rolling assembly 130 may have any suitable configuration to achieve its intended purpose. For example, more than one axially spaced magnet may be located within the hollow cylinder of the rolling roller body 134, each magnet being associated with one or more magnetic sensors for detecting changes in the magnetic field. In yet another embodiment, the rolling assembly 130 may omit the bottom cover 160, thereby allowing its axis of rotation to be directly fixed to the housing of the electronic device. Furthermore, in some embodiments, the haptic feedback assist assembly may have a different structure, or may even be omitted.

[0036] Figure 4 A side view of the rolling assembly 130 connected to the housing 110 of the electronic device is shown. As shown, the bottom cover 160 includes protective protrusions 162 at each end of the rolling rollers 132. These protective protrusions 162 are vertically higher than the apex of the rolling rollers 132 by a distance D2. In other words, the protective protrusions 162 extend beyond the rolling rollers 132 in the radial direction by a distance D2. This design protects the rolling rollers 132 from accidental contact and potential damage while ensuring unimpeded interaction between the user and the rolling rollers 132, as the protective protrusions 162 are located at the ends, away from the central interaction area of ​​the rolling rollers 132. In one or more embodiments, the vertical distance D2 may be about 1 mm, in the range of 1 mm to 3 mm, or in the range of 1 mm to 5 mm.

[0037] Figure 5 It shows along Figure 3C The cross-sectional view taken from line 5-5. As shown, the rolling roller 132 ( Figure 5 A rotating shaft 152 (not shown) is fitted with a gear 156, which is configured to rotate in tandem with the shaft 152. The gear 156 has a radial outer periphery with a plurality of protruding teeth 156a and corresponding recessed grooves 156b.

[0038] The haptic feedback assist assembly 180 includes a base 182, a sealing ring 184, and a spring clip 186. The spring clip 186 includes a clamping base portion attached to the base 182 and two clamping portions 188, 188' extending from the clamping base portion. The clamping portions 188, 188' are positioned on opposite sides of the gear 156 and each has resilient protrusions 190, 190'. The spring clip 186 is positioned and oriented in a manner that allows the resilient protrusions 190, 190' to selectively engage from opposite sides with recessed grooves 156b of the gear 156.

[0039] As the rolling roller 132 rotates, the elastic protrusions 190, 190' repeatedly enter and engage the recessed groove 156b due to their elasticity, while the gear 156 continuously disengages from the recessed groove 156b by overcoming the resistance of the spring clip 186. This arrangement provides clear tactile feedback to the user as they rotate the rolling roller 132, thereby enhancing the user experience. Depending on requirements, the gear 156 can have different numbers of teeth to provide different tactile feedback experiences. In the illustrated embodiment, the gear has eight teeth. In one or more other embodiments, the gear can have more or fewer teeth to provide different tactile feedback.

[0040] According to one or more embodiments of this disclosure, this disclosure can be implemented as follows.

[0041] Clause 1: A rolling assembly for an electronic device including a housing, the rolling assembly comprising: a rolling mechanism rotatably mounted to the housing of the electronic device, wherein at least a portion of the rolling mechanism is exposed outside the housing; a magnet disposed in the rolling mechanism; and at least one magnetic sensor fixedly mounted inside the housing of the electronic device, magnetically coupled to the magnet through the housing therebetween, and configured to detect the magnetic field of the magnet in a non-contact manner.

[0042] Clause 2: The rolling assembly according to Clause 1, wherein the at least one magnetic sensor comprises two magnetic sensors, both of which are magnetically coupled to the magnet through the housing, wherein the two magnetic sensors are spaced apart from each other and are in the same plane as the magnet perpendicular to the axis of rotation of the rolling mechanism.

[0043] Clause 3: The rolling assembly according to any one of Clauses 1 to 2, wherein the two magnetic sensors are equidistant from the axis of rotation of the rolling mechanism and are arranged at an angle relative to the axis of rotation, the angle being in the range of 30 to 150 degrees, 60 to 120 degrees or about 90 degrees.

[0044] Clause 4: A rolling assembly according to any one of Clauses 1 to 3, wherein the magnet is positioned and oriented such that its magnetic pole direction extending from the North Pole to the South Pole is perpendicular to the axis of rotation of the rolling mechanism.

[0045] Clause 5: A rolling assembly according to any one of Clauses 1 to 4, wherein the rolling mechanism is a rolling roller, and the rolling assembly includes two protective portions, each located at a corresponding end of the rolling roller, wherein each protective portion extends beyond the rolling roller in the radial direction of the rolling mechanism.

[0046] Clause 6: The rolling assembly according to any one of Clauses 1 to 5 further comprises: a gear mounted to one end of the rolling mechanism and configured to rotate with the rolling mechanism; and a spring clip configured to selectively engage with the teeth of the gear during rotation of the rolling mechanism.

[0047] Clause 7: A rolling assembly according to any one of Clauses 1 to 6, wherein the spring clip includes two clip portions positioned on opposite sides of the gear, each clip portion being configured to selectively engage with a tooth of the gear during rotation of the rolling mechanism.

[0048] Clause 8: A rolling assembly according to any one of Clauses 1 to 7, wherein the rolling mechanism includes a rotating shaft at each end, wherein each rotating shaft is received in a corresponding hole in the housing, and the rolling mechanism further includes an elastic layer that wraps around the radially outer side of each rotating shaft.

[0049] Clause 9: A rolling assembly according to any one of Clauses 1 to 8, wherein the rolling assembly further includes a bottom cover, and the rolling mechanism further includes a rotating shaft at each end, wherein each rotating shaft is received in a corresponding hole in the bottom cover, and the rolling mechanism further includes an elastic layer that wraps around the radially outer side of each rotating shaft.

[0050] Clause 10: The rolling assembly according to any one of Clauses 1 to 9 further includes a flexible PCB, on which the at least one magnetic sensor is mounted.

[0051] Clause 11: The rolling assembly according to any one of Clauses 1 to 10, wherein each of the at least one magnetic sensor is spaced from the magnet by a distance of 3 mm to 15 mm, 3 mm to 10 mm, 4 mm to 6 mm, or about 5 mm.

[0052] Clause 12: A rolling assembly according to any one of Clauses 1 to 11, wherein the rolling mechanism is a rolling roller, the rolling roller comprising a rolling roller body and two end members, each of the two end members being mounted to one end of the rolling roller body, the rolling roller body being in the shape of a substantially hollow cylinder, wherein the magnet is located within the hollow cylinder of the rolling roller body.

[0053] Clause 13: A rolling assembly according to any one of Clauses 1 to 12, wherein each of the end members has a rod portion extending into the hollow cylinder of the roller body, and the rolling roller body further includes a stop portion extending from the rolling roller body into the hollow cylinder, wherein the rod portion of one end member presses against the stop portion, and the rod portion of the other end member presses the magnet against the stop portion.

[0054] Clause 14: An electronic device comprising: a housing containing electronic components; and a rolling assembly according to any one of Clauses 1 to 13.

[0055] Clause 15: The electronic device according to Clause 14 further includes a controller electronically connected to the at least one magnetic sensor.

[0056] Systems and methods have been described in general terms to aid in understanding the details of this disclosure. In some cases, well-known structures, materials, and / or operations have not been specifically shown or described in detail to prevent obscuring aspects of this disclosure. In other cases, specific details have been given to provide a thorough understanding of this disclosure. Those skilled in the art will recognize that this disclosure may be embodied in other specific forms, such as to suit a particular system or device or situation, or material or component, without departing from its spirit or essential characteristics. Therefore, the disclosure and description herein are intended to define the scope of this disclosure and not to limit it. Consequently, this disclosure is not limited except by consideration of the appended claims and their equivalents.

Claims

1. A rolling assembly for an electronic device including a housing, the rolling assembly comprising: A rolling mechanism, rotatably mounted to the housing of the electronic device, wherein at least a portion of the rolling mechanism is exposed outside the housing; A magnet, wherein the magnet is disposed in the rolling mechanism; and At least one magnetic sensor is fixedly mounted inside the housing of the electronic device, magnetically coupled to the magnet through the housing between the at least one magnetic sensor and the magnet, and configured to detect the magnetic field of the magnet in a non-contact manner.

2. The rolling assembly according to claim 1, wherein the at least one magnetic sensor comprises two magnetic sensors, both of which are magnetically coupled to the magnet through the housing, wherein the two magnetic sensors are spaced apart from each other and are in the same plane as the magnet perpendicular to the axis of rotation of the rolling mechanism.

3. The rolling assembly according to claim 2, wherein the two magnetic sensors are equidistant from the axis of rotation of the rolling mechanism and are arranged at an angle relative to the axis of rotation, the angle being in the range of 30 degrees to 150 degrees, 60 degrees to 120 degrees, or approximately 90 degrees.

4. The rolling assembly according to claim 1, wherein the magnet is positioned and oriented such that its magnetic pole direction extending from the North Pole to the South Pole is perpendicular to the rotation axis of the rolling mechanism.

5. The rolling assembly of claim 1, wherein the rolling mechanism is a rolling roller, and the rolling assembly includes two protective portions, each located at a respective end of the rolling roller, wherein each protective portion extends beyond the rolling roller in the radial direction of the rolling mechanism.

6. The rolling assembly according to any one of claims 1 to 5, further comprising: A gear, which is mounted to one end of the rolling mechanism and configured to rotate with the rolling mechanism; and a spring clip configured to selectively engage with the teeth of the gear during rotation of the rolling mechanism.

7. The rolling assembly of claim 6, wherein the spring clip includes two clip portions positioned on opposite sides of the gear, each clip portion being configured to selectively engage with a tooth of the gear during rotation of the rolling mechanism.

8. The rolling assembly according to any one of claims 1 to 5, wherein the rolling mechanism includes a rotating shaft at each end, wherein each rotating shaft is received in a corresponding hole in the housing, and the rolling mechanism further includes an elastic layer wrapping the radially outer side of each rotating shaft.

9. The rolling assembly according to any one of claims 1 to 5, wherein the rolling assembly further comprises a bottom cover, and the rolling mechanism further comprises a rotating shaft at each end, wherein each rotating shaft is received in a corresponding hole in the bottom cover, and the rolling mechanism further comprises an elastic layer wrapping the radially outer side of each rotating shaft.

10. The rolling assembly according to any one of claims 1 to 5, further comprising a flexible PCB, wherein the at least one magnetic sensor is mounted on the flexible PCB.

11. The rolling assembly according to any one of claims 1 to 5, wherein each of the at least one magnetic sensor is spaced from the magnet by a distance of 3 mm to 15 mm, 3 mm to 10 mm, 4 mm to 6 mm, or about 5 mm.

12. The rolling assembly according to any one of claims 1 to 5, wherein the rolling mechanism is a rolling roller, the rolling roller comprising a rolling roller body and two end members, each of the two end members being mounted to one end of the rolling roller body, the rolling roller body being in the shape of a substantially hollow cylinder, wherein the magnet is located within the hollow cylinder of the rolling roller body.

13. The rolling assembly of claim 12, wherein each of the end members has a rod portion extending into the hollow cylinder of the roller body, and the rolling roller body further includes a stop portion extending from the rolling roller body into the hollow cylinder, wherein the rod portion of one end member presses against the stop portion, and the rod portion of the other end member presses the magnet against the stop portion.

14. An electronic device comprising: A housing containing electronic components; and The rolling assembly according to any one of claims 1 to 13.

15. The electronic device of claim 14, further comprising a controller electrically connected to the at least one magnetic sensor.

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