Electronic device and magnetic induction adjusting knob assembly thereof

Abstract

The utility model belongs to the field of electronic device knobs, relates to an electronic device and a magnetic induction adjusting knob assembly thereof, and discloses a magnetic induction adjusting knob assembly which comprises a knob cap and a magnet, the magnet is embedded and fixed at the bottom of the knob cap, a knob shell sleeve is arranged on the outer side of the knob cap, and two opposite ends of the knob shell sleeve are respectively a closed end and an open end. The bottom of the knob cap abuts against the inner end face of the closed end and is in rotating fit with the inner end face of the closed end, the magnet and the closed end are arranged at an interval, the inner circumferential face of the knob shell sleeve is provided with a first clamping portion arranged in the circumferential direction, the outer circumferential face of the knob cap is provided with a second clamping portion arranged in the circumferential direction, and the second clamping portion is clamped in the first clamping portion. The utility model further discloses an electronic device, and the electronic device comprises a Hall element and the knob assembly. According to the scheme, the magnet is prevented from being abraded without increasing the machining difficulty of the whole shell, and meanwhile the reliability and stability of the rotary knob in the radial and axial long-term rotation period are improved.

Description

Technical Field

[0001] The utility model relates to the field of electronic device knobs, in particular to an electronic device and a magnetic induction-adjustable knob assembly thereof. Background Art

[0002] Electronic devices are important components in electronic systems. They are mainly composed of circuit boards, multiple electronic components and related carrier parts. They play specific roles in electronic systems such as physical sensing, information conversion or signal amplification.

[0003] As the application scenarios of electrical devices continue to increase, the functional requirements for electronic devices are also constantly increasing. For example, sensor-type electronic devices such as proximity switches often adopt non-detachable structures to prevent theft and loosening, and are also installed in locations that are not convenient for disassembly, making it impossible to change related setting parameters such as sensing distance and sensing sensitivity by replacing similar electronic devices of different specifications. In order to change the relevant setting parameters without disassembling and replacing electronic devices, a variety of electronic devices have been developed that can change the setting parameters through their own physical adjustment. Among them, the non-contact adjustment of the combination of Hall elements and magnets is widely used. The working principle of this adjustment method is that when the magnet rotates, it will rotate and change the direction and strength of the magnetic field. The magnet and the Hall element are installed on the same axis. Based on the Hall effect, the potential difference on the opposite sides of the Hall element changes. Therefore, the relevant setting parameters of the electronic device can be indirectly controlled by adjusting the potential difference of the Hall element to achieve the effect of physical adjustment.

[0004] At present, the magnet is often fixed at the bottom of the knob cap to be close to the Hall element, and together with the knob cap, it forms a knob fixed on the mounting hole of the housing. Twisting the knob cap can drive the magnet located in the housing to rotate. However, due to the small contact area between the housing and the knob cap, the contact point is far away from the center of gravity of the knob, and there is an assembly gap, it is easy to produce large shaking, affecting the adjustment accuracy. If the mounting hole is adjusted to a blind hole structure, the magnet is abutted against the bottom of the blind hole to fix the knob axially, and the housing and the blind hole are tightened by a sealing ring to fix the knob radially, although the above-mentioned contact area can be increased and the above-mentioned contact point can be prevented from being far away from the center of gravity of the knob, after the knob is rotated for a long time, the magnet and the sealing ring will wear due to their own material characteristics, which will cause the knob to shake greatly in the axial and radial directions; in addition, the blind hole and the housing are integrally formed, and there is a problem that the hole forming accuracy is difficult to control, which increases the difficulty of processing the entire housing. Utility Model Content

[0005] The purpose of the utility model is to provide an electronic device and a knob assembly for magnetic induction adjustment thereof, so as to avoid magnet wear without increasing the difficulty of processing the entire shell, and at the same time improve the reliability and stability of the knob during long-term radial and axial rotation.

[0006] The technical solution provided by the present utility model is: a knob assembly with magnetic induction adjustment, including a knob cap and a magnet. A magnet for changing the electromotive force on the Hall element is embedded and fixed at the bottom of the knob cap. A knob housing sleeve is provided on the outer side of the knob cap for fixing on the mounting hole of the housing. The opposite ends of the knob housing sleeve are respectively a closed end and an open end. The bottom of the knob cap abuts against the inner end face of the closed end in a relatively rotatable manner. The magnet is spaced from the closed end. A first clamping portion is provided on the inner peripheral surface of the knob housing sleeve along its circumferential direction. A second clamping portion is provided on the outer peripheral surface of the knob cap along its circumferential direction. The second clamping portion is clamped in the first clamping portion and is rotationally matched with the first clamping portion along the circumferential direction of the knob cap.

[0007] In the above-mentioned knob assembly with magnetic induction adjustment, a buckle is provided on the inner peripheral surface of the knob housing sleeve along its circumferential direction. The buckle is spaced from the inner end face of the closed end. A first clamping portion is formed between the buckle and the inner end face of the closed end. The second clamping portion is clamped between the buckle and the inner end face of the closed end.

[0008] The buckle includes at least two first clamping blocks arranged in a circular array around the axis of the knob housing sleeve.

[0009] In the above-mentioned knob assembly with magnetic induction adjustment, a card slot is provided on the outer peripheral surface of the knob cap. The card slot is spaced from the bottom of the knob cap. A second clamping portion is formed between the card slot and the bottom of the knob cap. The first clamping block is clamped in the card slot.

[0010] The second clamping portion includes at least two second clamping blocks arranged in a circular array around the axis of the knob cap.

[0011] In the above-mentioned knob assembly with magnetic induction adjustment, a positioning portion is provided on the outer peripheral surface of the knob housing sleeve for clamping on the inner side surface of the mounting hole.

[0012] In the above-mentioned knob assembly with magnetic induction adjustment, the open end is provided with an outwardly extending edge, and a welding wire is provided on the lower surface of the edge.

[0013] In the above-mentioned knob assembly with magnetic induction adjustment, a convex ring is provided on the end surface of the bottom of the knob cap, and the magnet is located inside the convex ring.

[0014] In the above-mentioned knob assembly with magnetic induction adjustment, a concave platform is provided on the inner end surface of the closed end. The magnet extends into the concave platform and is spaced from the bottom of the concave platform.

[0015] In the above-mentioned magnetic induction adjustment knob assembly, the two poles of the magnet are respectively arranged on opposite sides of the axis of the magnet; the side of the magnet is provided with a side plane, and the side plane extends to the top and bottom of the magnet.

[0016] In the above-mentioned magnetic induction adjustment knob assembly, a slot for twisting the knob cap is provided on the top of the knob cap, and a pointing portion is provided at one end of the slot.

[0017] The present technical solution also provides an electronic device, comprising a housing and a circuit board arranged in the housing, the circuit board being provided with a Hall element, the housing being provided with a mounting hole, the mounting hole being provided with a knob assembly for magnetic induction adjustment as described in any of the above items, the knob shell being fixedly connected to the mounting hole, and the closed end being arranged inside the housing and facing the Hall element.

[0018] After adopting the above technical solution, the utility model has the following beneficial effects:

[0019] The present technical solution sets a knob shell and fixes the knob shell on the mounting hole of the shell, so that the knob shell becomes a blind hole structure on the shell, and the knob shell and the shell are processed separately, so that the blind hole structure formed by the combination of the knob shell and the shell does not need to be processed by integrally forming with the shell, thereby reducing the overall processing difficulty of the shell; when in use, the knob cap is installed in the knob shell, and the bottom of the knob cap abuts against and rotates with the closed end of the knob shell, while the magnet, which is also embedded and fixed at the bottom of the knob cap, is spaced apart from the closed end to avoid direct contact with the closed end. At this time, the closed end only directly contacts the bottom of the knob cap, and supporting the knob cap so that the knob cap falls on the closed end can also ensure that the magnet and the closed end are separated, thereby preventing the magnet from being worn due to friction with the closed end; in addition, the second The locking portion is locked in the first locking portion on the knob shell, and the second locking portion rotates relatively in the first locking portion as the knob rotates. The second locking portion and the first locking portion rotate in cooperation with each other, so that the knob cap is relatively fixed in the knob shell along its axial direction, and the bottom of the knob cap is limited to abut against the closed end, and the knob cap is also relatively fixed in the knob shell along its radial direction. Since the side surface of the knob cap is in direct contact with the side surface of the knob shell, compared with the method of using a sealing ring, the sealing ring is avoided from being worn due to long-term rotation, resulting in large radial shaking of the knob cap, that is, the knob cap is avoided from having large radial and axial shaking in the knob shell. With the cooperation of the above-mentioned features, the wear of the magnet is avoided without increasing the difficulty of processing the entire shell, and the reliability and stability of the knob during long-term radial and axial rotation are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a schematic structural diagram of the electronic device according to Embodiment 1 of the present utility model;

[0021] Figure 2 It is an exploded view of the components of the electronic device according to Embodiment 1 of the present utility model;

[0022] Figure 3 It is a three-dimensional cross-sectional view of the knob assembly for magnetic induction adjustment according to Embodiment 1 of the present utility model;

[0023] Figure 4 It is of the present utility model Figure 3 Partial enlarged view of A;

[0024] Figure 5 It is a schematic structural diagram of the open end of the knob housing sleeve according to Embodiment 1 of the present utility model;

[0025] Figure 6 It is a schematic structural diagram of the closed end of the knob housing sleeve according to Embodiment 1 of the present utility model;

[0026] Figure 7 It is a schematic structural diagram of one side of the axis of the knob cap according to Embodiment 1 of the present utility model;

[0027] Figure 8 It is a schematic structural diagram of the side of the knob cap opposite to the axis.

[0028] Reference numerals: 1, outer shell; 2, circuit board; 3, knob housing sleeve; 4, knob cap; 5, magnet;

[0029] 11, mounting hole; 111, bayonet; 112, first welding wire; 21, Hall element;

[0030] 31, open end; 32, second welding wire; 33, positioning part; 331, positioning plane; 34, first clamping block; 35, first clamping position part; 36, concave platform; 37, first notch; 38, closed end;

[0031] 41, slot; 411, pointing part; 42, card slot; 43, second clamping position part; 44, second notch. Detailed implementation manners

[0032] The technical solutions of the present utility model will be further described in detail below in conjunction with the specific implementation manners, but it does not constitute any limitation to the present utility model.

[0033] Embodiment 1:

[0034] As Figure 1-8As shown, the knob assembly for magnetic induction adjustment includes a knob cap 4 and a magnet 5. The bottom of the knob cap 4 is embedded with a magnet 5 for changing the electromotive force on the Hall element 21. The outer side of the knob cap 4 is provided with a knob shell 3 for fixing on the mounting hole 11 of the housing 1. The opposite ends of the knob shell 3 are respectively a closed end 38 and an open end 31. The bottom of the knob cap 4 abuts against the inner end surface of the closed end 38 in a relatively rotatable manner. The magnet 5 is spaced apart from the closed end 38. A first locking portion 35 arranged along its circumferential direction is provided on the inner circumferential surface of the knob shell 3. A second locking portion 43 arranged along its circumferential direction is provided on the outer circumferential surface of the knob cap 4. The second locking portion 43 is clamped in the first locking portion 35 and rotates with the first locking portion 35 along the circumferential direction of the knob cap 4.

[0035] The specific working principle is that by setting the knob shell 3 and fixing the knob shell 3 on the mounting hole 11 of the outer shell 1, the knob shell 3 becomes a blind hole structure on the outer shell 1, and the knob shell 3 and the outer shell 1 are processed separately, so that the blind hole structure formed by the combination of the knob shell 3 and the outer shell 1 does not need to be processed by integrally molding with the outer shell 1, thereby reducing the overall processing difficulty of the outer shell 1; when in use, the knob cap 4 is installed in the knob shell 3, and the bottom of the knob cap 4 is abutted against and rotatably matched with the closed end 38 of the knob shell 3, and the magnet 5, which is also embedded and fixed at the bottom of the knob cap 4, is spaced apart from the closed end 38 to avoid direct contact with the closed end 38. At this time, the closed end 38 is only in direct contact with the bottom of the knob cap 4, supporting the knob cap 4 so that the knob cap 4 falls on the closed end 38 and can also ensure that the magnet 5 and the closed end 38 are separated, thereby preventing the magnet 5 from being worn due to friction with the closed end 38; in addition, the second latching portion 43 on the knob cap 4 is latched in the first latching portion 35 on the knob housing 3, and the second latching portion 43 rotates relatively in the first latching portion 35 as the knob rotates, and the second latching portion 43 rotates in cooperation with the first latching portion 35 , so that the knob cap 4 is relatively fixed in the knob shell 3 along its axial direction, and the bottom of the knob cap 4 is limited to abut against the closed end 38, and the knob cap 4 is also relatively fixed with the knob shell 3 along its radial direction. Since the side of the knob cap 4 is in direct contact with the side of the knob shell 3, compared with the method of using a sealing ring, the sealing ring is prevented from being worn due to long-term rotation, resulting in a large radial shaking of the knob cap 4, that is, the knob cap 4 is prevented from having a large radial and axial shaking in the knob shell 3. With the above-mentioned features working together, the present application achieves the avoidance of wear of the magnet 5 without increasing the overall processing difficulty of the housing 1, while improving the reliability and stability of the knob during long-term radial and axial rotation.

[0036] Combination Figure 2 and Figure 3As shown, in this embodiment, a buckle is provided on the inner peripheral surface of the knob housing sleeve 3 along its circumferential direction. The buckle is spaced from the inner end surface of the closed end 38, and a first clamping position portion 35 is formed between the buckle and the inner end surface of the closed end 38. The second clamping position portion 43 is clamped between the buckle and the inner end surface of the closed end 38.

[0037] In a specific application, the buckle is a convex structure on the inner peripheral surface of the knob housing sleeve 3. The buckle is spaced from the inner end surface of the closed end 38, so that a groove concave relative to the buckle is formed between the buckle and the inner end surface of the closed end 38. This groove is the first clamping position portion 35.

[0038] As Figure 2 or Figure 5 shown, the specific structure of the buckle is that the buckle includes at least two first clamping blocks 34 arranged in a circular array around the axis of the knob housing sleeve 3.

[0039] In a specific structure, two adjacent first clamping blocks 34 in the buckle are arranged at intervals, and the distance between two adjacent first clamping blocks 34 forms a first notch 37 on the buckle. The buckle reduces the processing difficulty and the requirements for forming accuracy of the buckle during molding and demolding through this first notch 37, and also reduces the amount of molding material used for the buckle, thereby reducing the processing cost and improving the processing efficiency.

[0040] In a specific implementation, the preferred number of the first clamping blocks 34 is three. In addition, the first clamping blocks 34 can also be set to one, two, or more than four. This embodiment does not impose excessive restrictions on the number of the first clamping blocks 34; when the first clamping block 34 is set to one, the first clamping block 34 is annular, and the center of the first clamping block 34 is located on the axis of the knob housing sleeve 3; when more than two first clamping blocks 34 are set, the number of the first notches 37 on the buckle is equal to the number of the first clamping blocks 34. For example, when the first clamping block 34 is set to two, a total of two first notches 37 are formed on the buckle; when the first clamping block 34 is set to three, a total of three first notches 37 are formed on the buckle, and so on.

[0041] Combined with Figure 2 and Figure 3 shown, correspondingly, a clamping groove 42 is formed on the outer peripheral surface of the knob cap 4. The clamping groove 42 is spaced from the bottom of the knob cap 4, and a second clamping position portion 43 is formed between the clamping groove 42 and the bottom of the knob cap 4. The first clamping block 34 is clamped in the clamping groove 42.

[0042] In a specific application, the clamping groove 42 is formed on the outer peripheral surface of the knob cap 4. The clamping groove 42 is an inner concave structure on the outer peripheral surface of the knob cap 4. The clamping groove 42 is spaced from the bottom of the knob cap 4, so that a protrusion convex relative to the clamping groove 42 is formed between the clamping groove 42 and the bottom of the knob cap 4. This protrusion is the second clamping position portion 43.

[0043] Among them, the buckle is clamped in the card slot 42, so that the buckle and the card slot 42 jointly form a clamping structure. Coupled with another clamping structure jointly formed by the second clamping position part 43 and the first clamping position part 35, the knob cap 4 and the knob housing sleeve 3 are connected through two clamping structures. In addition to the improvement in connection strength, stability and durability, the sealing performance is also improved.

[0044] As Figure 7 or Figure 8 shown, the specific structure of the second clamping position part 43 is that the second clamping position part 43 includes at least two second clamping blocks arranged in a circular array around the axis of the knob cap 4.

[0045] Similarly, two adjacent second clamping blocks in the second clamping position part 43 are arranged at intervals, and the distance between two adjacent second clamping blocks forms a second notch 44 on the second clamping position part 43. The second clamping position part 43 reduces the processing difficulty and the requirements for forming accuracy of the second clamping position part 43 during molding and demolding through this second notch 44, and also reduces the amount of molding material used for the second clamping position part 43, thereby reducing the processing cost and improving the processing efficiency.

[0046] In a specific implementation, the preferred number of the second clamping blocks is two. In addition, the second clamping blocks can also be set to one or more than three. This embodiment does not impose too many restrictions on the number of the second clamping blocks. When the second clamping block is set to one, the second clamping block is annular, and the center of the circle of the second clamping block is located on the axis of the knob housing sleeve 3; when more than two second clamping blocks are set, the number of the second notches 44 on the second clamping position part 43 is equal to the number of the second clamping blocks. For example, when the second clamping blocks are set to two, a total of two second notches 44 are formed on the second clamping position part 43; when the second clamping blocks are set to three, a total of three second notches 44 are formed on the second clamping position part 43, and so on.

[0047] In this embodiment, the width of the first notch 37 is smaller than the length of the second clamping block, and the width of the second notch 44 is smaller than the length of the first clamping block 34, so as to prevent the first clamping block 34 and the second clamping block from being separated by dislocation.

[0048] In addition, the first clamping position part 35 can be set as a ring groove or a ring-shaped protrusion. In some implementation manners, with the inner circumferential surface of the knob housing sleeve 3 as a reference plane, when the first clamping position part 35 is set as a ring groove opened on the inner circumferential surface of the knob housing sleeve 3, the ring groove is coaxially arranged with the knob housing sleeve 3 and is spaced from the inner end surface of the closed end 38. Correspondingly, the second clamping position part 43 is a ring-shaped protrusion arranged on the outer circumferential surface of the knob cap 4. The ring-shaped protrusion is coaxially arranged with the knob cap 4 and is clamped in the ring groove. The ring-shaped protrusion and the ring groove jointly form a clamping structure, and the knob cap 4 and the knob housing sleeve 3 are clamped through this clamping structure;

[0049] In some other embodiments, still taking the inner circumferential surface of the knob housing sleeve 3 as the reference surface, the first clamping portion 35 is an annular protrusion provided on the inner circumferential surface of the knob housing sleeve 3. The annular protrusion is coaxially arranged with the knob housing sleeve 3 and is spaced from the inner end surface of the closed end 38. Correspondingly, the second clamping portion 43 is provided as an annular groove opened on the outer circumferential surface of the knob cap 4. The annular groove is coaxially arranged with the knob cap 4, and the annular groove is clamped with the annular protrusion. The annular protrusion and the annular groove together form a clamping structure, and the knob cap 4 and the knob housing sleeve 3 are clamped through this clamping structure. Among them, no matter the annular protrusion is arranged on the knob cap 4 or the knob housing sleeve 3, a notch can be provided to split the annular protrusion into clamping blocks arranged at intervals along the circumferential direction of the knob cap 4.

[0050] As Figure 2 , Figure 3 or Figure 6 shown, for further improvement, a positioning portion 33 for being clamped on the inner side surface of the mounting hole 11 is provided on the outer circumferential surface of the knob housing sleeve 3.

[0051] In a specific implementation, a bayonet 111 is opened on the inner side surface of the mounting hole 11 of the outer shell 1. When the knob housing sleeve 3 is inserted into the mounting hole 11, it is clamped in the bayonet 111 through the positioning portion 33. The knob housing sleeve 3 is relatively fixed to the mounting hole 11 in the circumferential direction to provide installation positioning. When the end surface of the open end 31 of the knob housing sleeve 3 and the outer surface of the outer shell 1 are both curved surfaces, they can also be fitted and matched through the above installation positioning method.

[0052] Preferably, the positioning portion 33 extends axially along the knob housing sleeve 3 to the bottom of the knob housing sleeve 3. When the knob housing sleeve 3 is inserted into the mounting hole 11, the positioning portion 33 not only plays a positioning role but also guides the insertion of the knob housing sleeve 3 to improve the installation accuracy.

[0053] As Figure 6 shown, in another preference, the positioning portion 33 includes two positioning protrusions, which are respectively arranged on opposite sides of the knob housing sleeve 3. The outer surface of one positioning protrusion is an arc surface, and the outer surface of the other positioning protrusion is provided with a positioning plane 331 for identifying and distinguishing the installation rotation direction of the knob cap 4.

[0054] As Figure 2 or Figure 6 shown, in practical applications, the open end 31 is provided with an outwardly extending edge, and a wire is provided on the lower surface of the edge.

[0055] The wire bonding is arranged such that the knob housing sleeve 3 is heat-melt connected to the edge of the mounting hole 11 through the wire bonding on the edge of its open end 31. In specific assembly, the mounting hole 11 on the outer shell 1 is specifically set as a countersunk hole, and the edge of the knob housing sleeve 3 is arranged inside the countersink of the countersunk hole, and the wire bonding on the edge is fusion-welded inside the countersunk hole; wherein, the specific structure of the wire bonding can be a ring structure surrounding the edge of the open end 31, or a structure formed by arranging multiple wire bonding segments at intervals along the edge of the port end. In practical applications, the wire bonding preferably adopts a structure composed of multiple wire bonding segments. The gap between adjacent wire bonding segments can accommodate part of the molten wire bonding segments to prevent overflow to the outside of the edge of the open end 31.

[0056] In some example embodiments, in addition to being set as a countersunk hole, the mounting hole 11 can also be set as a common through hole. When the mounting hole 11 is a common through hole, the edge of the knob housing sleeve 3 fits on the outer surface of the outer shell 1 and is heat-melt connected to the outer surface of the outer shell 1 through wire bonding.

[0057] In addition, when the mounting hole 11 is set as a countersunk hole, as Figure 2 shown, wire bonding can also be arranged inside the countersink of the countersunk hole. The wire bonding in the countersunk hole is the first wire bonding 112, and the wire bonding on the edge of the open end 31 is the second wire bonding 32. The first wire bonding 112 and the second wire bonding 32 are mutually fusion-welded; when the mounting hole 11 is a common through hole, wire bonding can also be arranged on the outer surface of the outer shell 1. At this time, the wire bonding on the outer shell 1 is the first wire bonding 112, and the wire bonding on the edge of the open end 31 is the second wire bonding 32. The first wire bonding 112 and the second wire bonding 32 are mutually fusion-welded.

[0058] As Figure 4 shown, in another improvement of this embodiment, a convex ring is provided on the end surface at the bottom of the knob cap 4, and the magnet 5 is located inside the convex ring.

[0059] The provision of the convex ring reduces the friction area between the bottom of the knob cap 4 and the inner end surface of the closed end 38, improving the smoothness of rotation of the knob cap 4.

[0060] As Figure 4 shown, as a further improvement of this embodiment, a concave platform 36 is provided on the inner end surface of the closed end 38. The magnet 5 extends into the concave platform 36 and is spaced from the bottom of the concave platform 36.

[0061] The provision of the concave platform 36 reduces the local thickness of the closed end 38 directly below the magnet 5, thereby reducing the attenuation of the magnetic field of the magnet 5 transmitted to the Hall element 21 and improving the induction quality and stability of the Hall element 21; and the magnet 5 extends into the concave platform 36, reducing the distance to the Hall element 21, which also improves the induction quality and stability of the Hall element 21.

[0062] As Figure 2As shown, the specific structure of the magnet 5 is that the two magnetic poles of the magnet 5 are respectively arranged on the opposite sides of the axis of the magnet 5; a side plane is provided on the side surface of the magnet 5, and the side plane extends to the top and bottom of the magnet 5.

[0063] The arrangement of the two magnetic poles of the magnet 5 enables the two magnets 5 of the magnet 5 to generate an azimuth change relative to the Hall element 21 during rotation, that is, the intensity and direction of the magnetic field of the magnet 5 change relative to the Hall element 21, causing a change in the electromotive force of the Hall element 21 to achieve an adjustment effect; the setting of the side plane not only provides installation positioning when the magnet 5 and the knob cap 4 are installed, but also prevents the magnet 5 from rotating relative to the knob cap 4 along its circumferential direction after the magnet 5 and the knob cap 4 are installed; on the other hand, the magnetic induction lines between the two magnetic poles of the magnet 5 are no longer evenly distributed due to the side plane, resulting in a difference in the magnetic field intensity of the magnet 5 in different directions. When the magnet 5 rotates, the change in the magnetic field intensity generated by the magnet 5 through the side plane can also cause a change in the electromotive force of the Hall element 21.

[0064] Combined with Figure 2 、 Figure 7 and Figure 8 As shown, the specific structure of the knob cap 4 is that a slot 41 for twisting the knob cap 4 is provided at the top of the knob cap 4, and a pointing portion 411 is provided at one end of the slot 41.

[0065] The setting of the pointing portion 411 provides a visual identifier for the operator. By observing the pointing portion 411, the angle of rotation of the knob cap 4 can be known, or it can be rotated to the desired direction according to the pointing portion 411.

[0066] The specific connection structure between the magnet 5 and the knob cap 4 is that an inner cavity is provided at the bottom of the knob cap 4, the contour of the inner cavity matches the outer contour of the magnet 5, and the magnet 5 is in interference fit with the inner cavity.

[0067] Combined with Figure 1 and Figure 2 As shown, this embodiment also provides an electronic device, including a housing 1 and a circuit board 2 provided in the housing 1. A Hall element 21 is provided on the circuit board 2. An installation hole 11 is provided on the housing 1, and a knob assembly for magnetic induction adjustment as described above is provided in the installation hole 11. The knob housing 3 is fixedly connected to the installation hole 11, and the closed end 38 is provided inside the housing 1 and faces the Hall element 21.

[0068] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A knob assembly for magnetic induction adjustment, comprising a knob cap and a magnet, wherein the bottom of the knob cap is embedded with a magnet for changing the electromotive force on a Hall element, characterized in that: A knob shell sleeve is provided on the outer side of the knob cap for being fixed on the mounting hole of the outer shell, and the opposite ends of the knob shell sleeve are a closed end and an open end respectively. The bottom of the knob cap abuts against the inner end surface of the closed end in a relatively rotatable manner, and the magnet is spaced apart from the closed end. A first locking portion is provided on the inner circumferential surface of the knob shell sleeve along its circumferential direction, and a second locking portion is provided on the outer circumferential surface of the knob cap along its circumferential direction. The second locking portion is locked in the first locking portion and rotatably cooperates with the first locking portion along the circumferential direction of the knob cap.

2. The magnetic induction adjustment knob assembly according to claim 1, characterized in that: A buckle is provided on the inner circumferential surface of the knob housing along the circumferential direction thereof, the buckle is spaced apart from the inner end surface of the closed end, the first clamping portion is formed between the buckle and the inner end surface of the closed end, and the second clamping portion is clamped between the buckle and the inner end surface of the closed end; The buckle includes at least two first clamping blocks in a circular array around the axis of the knob housing.

3. The magnetic induction adjustment knob assembly according to claim 2, characterized in that: A clamping groove is provided on the outer circumference of the knob cap, the clamping groove is spaced apart from the bottom of the knob cap, the second clamping portion is formed between the clamping groove and the bottom of the knob cap, and the first clamping block is clamped in the clamping groove; The second locking portion includes at least two second locking blocks in a circular array around the axis of the knob cap.

4. The magnetic induction adjustment knob assembly according to any one of claims 1 to 3, characterized in that: A positioning portion for clamping on the inner side surface of the mounting hole is provided on the outer peripheral surface of the knob shell.

5. The magnetic induction adjustment knob assembly according to any one of claims 1 to 3, characterized in that: The open end is provided with an edge extending outward, and a welding line is provided on the lower surface of the edge.

6. The magnetic induction adjustment knob assembly according to any one of claims 1 to 3, characterized in that: A convex ring is arranged on the end surface of the bottom of the knob cap, and the magnet is located on the inner side of the convex ring.

7. The magnetic induction adjustment knob assembly according to any one of claims 1 to 3, characterized in that: A concave platform is provided on the inner end surface of the closed end, and the magnet extends into the concave platform and is spaced apart from the bottom of the concave platform.

8. The magnetic induction adjustment knob assembly according to any one of claims 1 to 3, characterized in that: The two magnetic poles of the magnet are respectively arranged on two opposite sides of the axis of the magnet; the side surface of the magnet is provided with a side plane, and the side plane extends to the top and the bottom of the magnet.

9. The magnetic induction adjustment knob assembly according to any one of claims 1 to 3, characterized in that: A slot for twisting the knob cap is provided on the top of the knob cap, and a pointing portion is provided at one end of the slot.

10. An electronic device, comprising a housing and a circuit board arranged in the housing, wherein a Hall element is arranged on the circuit board, wherein: A mounting hole is provided on the shell, and a magnetic induction adjustment knob assembly as described in any one of claims 1 to 9 is provided in the mounting hole. The knob shell is fixedly connected to the mounting hole, and the closed end is provided inside the shell and faces the Hall element.

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