A knob switch with adjustable torsion resistance

Abstract

The application relates to a knob switch with adjustable torsion resistance, which comprises a shell base and a knob body, the knob body is rotatably arranged on the shell base, the knob body and the shell base cooperatively form an internal accommodating space, a PCB board is fixedly arranged in the accommodating space, a grating frame is rotatably arranged in the accommodating space, the PCB board is provided with a photoelectric sensor, the grating frame is provided with a light blocking part, the light blocking part approaches or leaves the photoelectric sensor when the knob body is rotated, an inductor is fixedly arranged in the accommodating space, and a magnetic ring is rotatably arranged in the accommodating space, wherein the inductor is provided with a metal rod arranged horizontally and a coil wound on the metal rod, the coil is electrically connected with the PCB board, the magnetic ring is located outside the periphery of the metal rod, the knob body is provided with a capacitance touch structure, when the knob body receives a grabbing signal, the capacitance changes, at this time, the switch outputs corresponding current to the inductive coil, the magnetic field force value of the magnetic ring is changed, and the working current supplied to the inductive coil is adjustable. The change of the rotation resistance changes the rotation feeling.

Description

Technical Field

[0001] This invention relates to the field of switch operation technology, and in particular to a rotary switch with adjustable torsional resistance. Background Technology

[0002] A knob is a manual component that is turned by hand. A knob is a common circular protrusion, disc, or scale with one or more markings engraved on its edge. It can be rotated or pushed or pulled out to start, manipulate, or control something.

[0003] CN110635796A discloses a knob including a rotating component and a fixed component. The rotating component is rotatably mounted on the fixed component. The fixed component is provided with a first photoelectric sensor, a second photoelectric sensor, and a magnet. The rotating component is provided with a plurality of first light-blocking parts evenly distributed along the circumference. When the rotating component is rotated, the first light-blocking parts successively approach one of the first photoelectric sensor and the second photoelectric sensor, and then the other of the first photoelectric sensor and the second photoelectric sensor. When the first light-blocking part approaches the first photoelectric sensor, it cuts off the first light signal of the first photoelectric sensor; when the first light-blocking part leaves the first photoelectric sensor, it connects the first light signal of the first photoelectric sensor. When the first light-blocking part approaches the second photoelectric sensor, it cuts off the second light signal of the second photoelectric sensor; when the first light-blocking part moves away from the second photoelectric sensor, it connects the second light signal of the second photoelectric sensor. The rotating component is also provided with a circumferential toothed edge. The toothed edge is close to the magnet so that any of its protrusions is attracted by the magnet. Through the attraction and engagement between the magnet and the toothed edge, when the user rotates the rotating component, the protrusion of the toothed edge that is about to leave the magnet is attracted by the magnet, generating rotational resistance; the protrusion of the toothed edge that is about to approach the magnet is attracted by the magnet, generating rotational assistance, creating a very interesting experience. After the user releases their hand, the rotating component will rotate slightly, causing the cam closest to the magnet on the toothed edge to rotate next to the magnet. The above-mentioned knob has the following drawback: the rotational resistance generated by the magnet attraction during rotation is fixed and cannot be adjusted as needed, thus making it impossible to change the rotational feel. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art by providing a rotary switch with adjustable torsional resistance, thereby changing the rotational feel by altering the rotational resistance.

[0005] The technical solution of the present invention: A rotary switch with adjustable torsional resistance value, comprising a housing and a knob body, wherein the knob body is rotatably mounted on the housing, and the knob body and the housing cooperate to form an internal accommodating space.

[0006] A PCB board is fixedly installed within the accommodating space, and a grating frame is rotatably mounted. A photoelectric sensor is mounted on the PCB board, and a light-blocking part is mounted on the grating frame. The grating frame rotates synchronously with a knob. When the knob is rotated, the light-blocking part approaches or moves away from the photoelectric sensor. When the light-blocking part approaches the photoelectric sensor, it cuts off the photoelectric sensor's light signal; when the light-blocking part moves away from the photoelectric sensor, it connects the photoelectric sensor's light signal.

[0007] An inductor is fixedly installed within a accommodating space, and a magnetic ring is rotatably mounted thereon. The inductor comprises a metal rod and a coil wound around it. The coil is electrically connected to a PCB board. The metal rod is horizontally positioned inside the magnetic ring, and the magnetic ring rotates synchronously with the knob body.

[0008] The knob has a capacitive touch structure. When the knob receives a human touch grasping signal, the capacitance changes. At this time, the switch outputs a corresponding current to the coil, thereby changing the magnetic force value of the magnetic ring. The working current supplied to the coil is adjustable.

[0009] Preferably, the magnetic ring has a polygonal inner hole, and a metal rod is placed in the inner hole with its end facing the polygonal hole wall of the inner hole.

[0010] Preferably, the metal rod is radially positioned along the magnetic ring, passing through the center of the magnetic ring, with its two ends corresponding to the inner ring of the magnetic ring.

[0011] Preferably, the photoelectric sensor is an optical coupler.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This invention utilizes the magnetic attraction between a magnetic ring and an inductor. When a hand grasps the knob and touches the knob body, the capacitance changes. At this time, the switch outputs a corresponding current to the induction coil, thereby changing the magnetic force on the magnetic ring. The rotational resistance generated by the attraction of the magnetic ring changes. The knob is only rotated when the torsional force exceeds the magnetic resistance. Compared to traditional mechanical spring-type knobs, since the movement is controlled by changes in the magnetic field, there is no actual friction, and therefore no frictional noise.

[0014] 2. The rotation operation can also be achieved by adjusting the working current supplied to the induction coil; the greater the current, the stronger the magnetic force generated. The knob structure of this invention is ingeniously designed, controlling the torque value through the current magnitude. The control method is simple and easy to implement, providing excellent rotational feel and a stronger interactive experience.

[0015] 3. The polygonal inner hole of the magnetic ring exhibits different attractive forces at the flat surface of the inner hole wall and at the inner groove corner. The flat surface of the inner hole wall, being closer to the end of the metal rod than the inner groove corner, has a stronger attractive force. When the user rotates the knob, the flat surface of the inner hole wall of the magnetic ring is about to leave the end of the metal rod, where it is attracted by the inductor, generating rotational resistance. Conversely, the flat surface of the inner hole wall of the magnetic ring, being closer to the end of the metal rod, is attracted by the inductor, generating rotational assistance. This creates a very interesting experience with excellent rotational feel and a stronger interactive experience. When the user releases the knob, it will rotate slightly, aligning the flat surface of the inner hole wall of the magnetic ring with the end of the metal rod.

[0016] 4. The magnetic ring is arranged in a ring shape, with a metal rod placed horizontally inside the magnetic ring and positioned past the center, so that the magnetic attraction is uniform and the operation is convenient.

[0017] 5. After multi-functional integration, design costs are reduced, vehicle space utilization is improved, and the simplicity of the vehicle interior is also enhanced.

[0018] A further feature of the present invention is that the knob body can also be pushed and pulled out, and drive the grating frame to slide synchronously. The photoelectric sensor has a first light area on its lower side and a second light area and a third light area side by side on its upper side.

[0019] The light-blocking part moves up and down when the knob is pushed and pulled out. When the knob is pulled up, the light-blocking part moves upward to correspond to the photoelectric sensor, and the light signal of the first light area on the lower side of the photoelectric sensor is turned on, while the light signals of the second and third light areas on the upper side are turned off. When the knob is pressed down, the light-blocking part moves downward to correspond to the photoelectric sensor, and the light signals of the first light area on the lower side of the photoelectric sensor, as well as the second and third light areas on the upper side, are turned off.

[0020] When the knob is in the pull-up position, the light-blocking part approaches or moves away from the photoelectric sensor when the knob body is rotated. When the light-blocking part approaches the photoelectric sensor, it cuts off the light signals of the second and third light areas. When the light-blocking part moves away from the photoelectric sensor, it connects the light signals of the second and third light areas.

[0021] When the knob is in the down position, the light-blocking part approaches or moves away from the photoelectric sensor when the knob body is rotated. When the light-blocking part approaches the photoelectric sensor, it cuts off the light signals of the first light area, the second light area, and the third light area. When the light-blocking part moves away from the photoelectric sensor, it connects the light signals of the first light area, the second light area, and the third light area.

[0022] With the above-described further configuration, this invention, through the cooperation of a light-blocking part and a photoelectric sensor, achieves signal output during propulsion / pull-out and signal output during rotation.

[0023] When the knob is pulled up, the light signal of the first light area on the lower side of the photoelectric sensor is turned on, and the light signals of the second and third light areas on the upper side are turned off, which is 1 on and 2 off. When the knob is pressed down, the light signals of the first light area on the lower side of the photoelectric sensor, as well as the second and third light areas on the upper side, are turned off, which is 3 off.

[0024] When the knob is rotated to the up position, it cuts off the light signals of the second and third light zones, or turns on the light signals of the second and third light zones, which is 2-on or 2-off;

[0025] When the knob is in the down position, it cuts off the light signals of the first light zone, as well as the second and third light zones, or turns on the light signals of the first light zone, the second light zone, and the third light zone, thereby generating electrical signals through the changes in the light signals, which are either 3-on or 3-off.

[0026] The number of on / off signals determines whether it is a push-pull operation or a rotation operation; the rotation direction of the knob is then determined by the time sequence of the signals generated in the second and third light zones.

[0027] A further feature of the present invention is as follows: a track body is fixedly provided within the accommodating space. The track body has an upper annular guide groove and a lower annular guide groove in its circumferential direction. A plurality of guide posts are provided on the grating frame at circumferential intervals. The grating frame has a groove, and a spring connecting the guide post is provided in the groove. The guide post is pressed against the guide groove by the action of the spring. The knob body drives the grating frame to move up and down synchronously, so that the guide post switches between the upper annular guide groove and the lower annular guide groove to achieve the stop.

[0028] With the above further settings, when the knob body moves up and down, the magnetic ring remains stationary, and the guide post switches between the upper and lower annular guide grooves. The guide post contacts the groove wall to achieve a tactile feel.

[0029] A further embodiment of the present invention includes: a knob body connected to a grating frame via a snap-fit ​​or screw; a rotating bracket inside the knob body; the rotating bracket rotating synchronously with the knob body in the circumferential direction and being axially fixed; an inner shell inside the rotating bracket; the inner shell being mounted on a track body located inside the grating frame and fixedly connected to a PCB board; a magnetic ring mounted on the rotating bracket and corresponding to the outer side of the inner shell; an inductor located within the inner shell; and the end of a metal rod extending through the inner shell, thus corresponding to the magnetic ring.

[0030] Preferably, the rotating bracket is axially fixed by the inner shell and the track body, and the rotating bracket is limited downward by the track body. The inner ring of the rotating bracket has a support platform for supporting the bottom surface of the magnetic ring. The magnetic ring is set on the support platform and rotates synchronously with the rotating bracket. The outer ring of the inner shell has a boss that can abut against the upper surface of the magnetic ring to limit the upward movement of the rotating bracket.

[0031] Preferably, the lower end of the inner shell has a vertical limiting groove, and the inner circumference of the upper end of the track body has a protrusion. The protrusion is vertically engaged in the limiting groove to achieve positioning of the inner shell and the track body. The metal rod end of the inductor passes through the limiting groove, and the magnetic ring corresponds to the limiting groove on the inner shell through which the metal rod end passes.

[0032] With the above further design, 1. The rotary switch has a simple installation structure. The rotary body is connected to the grating frame by a snap-fit ​​or screw to achieve synchronous rotation and up-and-down sliding. The rotating bracket, magnetic ring, and rotary body rotate synchronously. The rotating magnetic ring cooperates with the inductor to achieve the rotation feel. The end of the metal rod protrudes from the inner shell, thus corresponding to the magnetic ring and its cooperation; 2. The boss on the inner shell and the track body facilitate the axial positioning of the rotating bracket; 3. The rotating bracket facilitates the installation of the magnetic ring. Its limiting groove makes the installation of the inductor convenient, and the limiting groove can also cooperate with the protrusion on the track body for positioning. Attached Figure Description

[0033] Figure 1 This is a structural diagram of a specific embodiment of the present invention;

[0034] Figure 2 This is an internal structure diagram of a specific embodiment of the present invention;

[0035] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0036] Figure 4 This is a structural diagram of one side of the housing in a specific embodiment of the present invention;

[0037] Figure 5 This is a structural diagram of the photoelectric sensor in a specific embodiment of the present invention;

[0038] Figure 6 This is a structural diagram of the track body in a specific embodiment of the present invention;

[0039] Figure 7 This is a structural diagram of the inner shell in a specific embodiment of the present invention;

[0040] Figure 8 This is a structural diagram of one side of the knob body in a specific embodiment of the present invention;

[0041] Figure 9 This is a structural diagram of the rotating bracket in a specific embodiment of the present invention;

[0042] Figure 10 This is a diagram showing the fit between the inductor and the magnetic ring in a specific embodiment of the present invention.

[0043] In the diagram: 1. Housing; 2. Knob body; 3. PCB board; 4. Grating frame; 5. Photoelectric sensor; 41. Light blocking part; 6. Inductor; 7. Magnetic ring; 61. Metal rod; 62. Coil; 71. Inner hole; 71. Plane; 711. Inner groove angle; 712. First light zone; 51. Second light zone; 52. Third light zone; 53. Track body; 8. Upper annular guide groove; 81. Lower annular guide groove; 82. Guide post; 9. Groove; 42. Spring; 10. Rotating bracket; 11. Inner shell; 12. Support platform; 111. Boss; 121. Limiting groove; 122. Boss; 83. Detailed Implementation

[0044] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] like Figure 1-10 As shown, a rotary switch with adjustable torsional resistance according to the present invention includes a housing 1 and a knob body 2. The knob body 2 is rotatably mounted on the housing 1, and the knob body 2 and the housing 1 cooperate to form an internal accommodating space.

[0046] A PCB board 3 is fixedly installed within the accommodating space, and a grating frame 4 is rotatably mounted. A photoelectric sensor 5 is mounted on the PCB board 3, and multiple light-blocking parts 41 are evenly distributed circumferentially on the grating frame 4. The grating frame 4 rotates synchronously with a knob body 2. When the knob body 2 is rotated, the light-blocking parts 41 approach or move away from the photoelectric sensor 5. When the light-blocking parts 41 approach the photoelectric sensor 5, they cut off the light signal from the photoelectric sensor 5; when the light-blocking parts 41 move away from the photoelectric sensor 5, they connect the light signal from the photoelectric sensor 5.

[0047] Photoelectric sensor 5 is an optical coupler;

[0048] An inductor 6 is fixedly installed within the accommodating space, and a magnetic ring 7 is rotatably mounted thereon. The inductor 6 comprises a metal rod 61 and a coil 62 wound around it. The coil 62 is electrically connected to the PCB board 3. The metal rod 61 is horizontally positioned inside the magnetic ring 7. The magnetic ring 7 rotates synchronously with the knob body 2.

[0049] The knob body 2 has a capacitive touch structure. When the knob body 2 receives a human touch grasping signal, the capacitance changes. At this time, the switch outputs a corresponding current to the induction coil 62, thereby changing the magnetic force value of the magnetic ring 7. The working current supplied to the induction coil 62 is adjustable. The metal rod 61 is arranged radially along the magnetic ring 7, passing through the center of the magnetic ring 7, and the two ends of the metal rod 61 correspond to the inner ring of the magnetic ring 7 respectively.

[0050] The magnetic ring 7 has a polygonal inner hole 71, and a metal rod 7 is placed in the inner hole 71 with its end facing the polygonal hole wall of the inner hole 71. The polygonal hole wall of the inner hole 71 has a plurality of planes 711 and an inner groove angle 712 located between two adjacent planes 711.

[0051] Specifically, the knob body 2 can also be pushed and pulled out, and drive the grating frame 4 to slide synchronously. The photoelectric sensor 5 has a first light area 51 on its lower side and a second light area 52 and a third light area 53 arranged side by side on its upper side.

[0052] The light-blocking part 41 moves up and down when the knob body 2 is pushed and pulled out. When the knob body 2 is pulled up, the light-blocking part 41 moves upward corresponding to the photoelectric sensor 5, and the light signal of the first light area 51 on the lower side of the photoelectric sensor 5 is turned on, while the light signals of the second light area 52 and the third light area 53 on the upper side are turned off. When the knob body 2 is pressed down, the light-blocking part 41 moves downward corresponding to the photoelectric sensor 5, and the light signals of the first light area 51 on the lower side of the photoelectric sensor 5, as well as the second light area 52 and the third light area 53 on the upper side are turned off.

[0053] When the knob is in the pull-up position, the light-blocking part 41 approaches or moves away from the photoelectric sensor 5 when the knob body 2 is rotated. When the light-blocking part 41 approaches the photoelectric sensor 5, it cuts off the light signals of the second light area 52 and the third light area 53. When the light-blocking part 41 moves away from the photoelectric sensor 5, it connects the light signals of the second light area 52 and the third light area 53.

[0054] When the knob is in the depressed position, the light-blocking part 41 approaches or moves away from the photoelectric sensor 5 when the knob body 2 is rotated. When the light-blocking part 41 approaches the photoelectric sensor 5, it cuts off the light signals of the first light area 51, the second light area 52, and the third light area 53. When the light-blocking part 41 moves away from the photoelectric sensor 5, it connects the light signals of the first light area 51, the second light area 52, and the third light area 53.

[0055] A track body 8 is fixedly installed within the accommodating space. The track body 8 has an upper annular guide groove 81 and a lower annular guide groove 82 in its circumferential direction. A plurality of guide posts 9 or steel balls are arranged on the grating frame 4 at circumferential intervals. The grating frame 4 has a groove 42. A spring 10 is provided in the groove 42 to connect the guide post or steel ball. The guide post 9 is pressed against the guide groove by the action of the spring 10. The knob body 2 drives the grating frame 4 to move up and down synchronously, so that the guide post 9 switches between the upper annular guide groove 81 and the lower annular guide groove 82 to realize the stop.

[0056] The knob body 2 is connected to the grating frame 4 by a snap or screw. The inner side of the knob body 2 has a rotating bracket 11. The rotating bracket 11 rotates synchronously with the knob body 2 in the circumferential direction and is fixed in the axial direction. An inner shell 12 is also provided inside the rotating bracket 11. The inner shell 12 is provided on the track body 8. The track body 8 is located inside the grating frame 4 and is connected and fixed to the PCB board 3. The magnetic ring 7 is provided on the rotating bracket 11 and corresponds to the outer side of the inner shell 12. The inductor 6 is located in the inner shell 12, and the end of the metal rod 61 extends out of the inner shell 12, thus corresponding to the magnetic ring 7.

[0057] Preferably, the rotating bracket 11 is axially fixed by the inner shell 12 and the track body 8 respectively, and the rotating bracket 11 is limited downward by the track body 8. The inner ring of the rotating bracket 11 has a support platform 111 for supporting the bottom surface of the magnetic ring 7. The magnetic ring 7 is set on the support platform 111 and rotates synchronously with the rotating bracket 11. The outer ring of the inner shell 12 has a boss 121 that can abut against the upper surface of the magnetic ring 7 to limit the upward movement of the rotating bracket 11.

[0058] Preferably, the lower end of the inner shell 12 has a vertical limiting groove 122, and the inner circumference of the upper end of the track body 8 has a protrusion 83. The protrusion 83 is vertically engaged in the limiting groove 122 to achieve positioning of the inner shell 12 and the track body 8. The end of the metal rod 61 of the inductor 6 passes through the limiting groove 122, and the magnetic ring 7 corresponds to the limiting groove 122 through which the end of the metal rod 61 passes in the inner shell 12.

[0059] Specifically, the rotary switch also features a touchscreen with sensitive elements, allowing for touch operation and control.

[0060] The rotary switch has a simple installation structure. The knob body 2 is connected to the grating frame 4 by a snap-fit ​​or screw to achieve synchronous rotation and up-and-down sliding. The rotating bracket 11, magnetic ring 7 and knob body 2 rotate synchronously. The rotating magnetic ring 7 cooperates with the inductor 6 to achieve the rotation feel. The end of the metal rod 61 protrudes from the inner shell 12, thus corresponding to the magnetic ring 7 and cooperating with it. The boss 121 on the inner shell 12 and the track body 8 facilitate the axial limit of the rotating bracket 11. The rotating bracket 11 facilitates the installation of the magnetic ring 7. Its limiting groove 111 makes it easy to install the inductor 6. The limiting groove 111 can also cooperate with the protrusion 82 on the track body 8 for positioning.

[0061] The principle behind the tactile feedback of knob rotation:

[0062] When the user manually rotates the knob body 2, the capacitance changes when the user touches the knob body 2. At this time, the switch outputs a corresponding current to the induction coil 62, thereby changing the magnetic force on the magnetic ring 7 and changing the rotational resistance generated by the attraction of the magnetic ring 7. The knob body 2 is only driven to rotate when the operating torsional force is greater than the magnetic attraction resistance. The operating current supplied to the induction coil 62 can also be adjusted to vary. The larger the current, the stronger the magnetic force generated, thereby achieving different torsional resistance adjustments during rotation.

[0063] During rotation, due to the different attraction forces at the plane 711 of the inner wall of the polygonal inner hole 71 of the magnetic ring 7 and at the inner groove corner 712, the plane 711 of the inner wall is closer to the end of the metal rod 61 and has a stronger attraction force than the inner groove corner 712. This causes the plane 711 of the inner wall of the magnetic ring 7 to move away from the end of the metal rod 61 when the user rotates the knob body 2. It is attracted by the inductor 6, generating rotational resistance. The next plane 711 of the inner wall of the magnetic ring 7 is close to the end of the metal rod 6 and is attracted by the inductor 6, generating rotational assistance. This creates a very interesting experience with excellent rotational feel and a stronger interactive experience. After the user releases the knob body 2, it will rotate slightly so that the plane 711 of the inner wall of the magnetic ring 7 corresponds to the end of the metal rod 61.

[0064] The principle behind the tactile feedback of pushing and pulling the knob:

[0065] The knob body 2 drives the grating frame 4 to move up and down synchronously, so that the guide post 9 switches between the upper annular guide groove 81 and the lower annular guide groove 82 to achieve the gear position.

[0066] Knob on / off working principle:

[0067] When the knob body 2 is pulled up, the light signal of the first light area 51 on the lower side of the photoelectric sensor 5 is turned on, and the light signals of the second light area 52 and the third light area 53 on its upper side are turned off, which is 1 on and 2 off. When the knob body 2 is pressed down, the light signals of the first light area 51 on the lower side of the photoelectric sensor 5, as well as the second light area 52 and the third light area 53 on its upper side are turned off, which is 3 off.

[0068] When the knob is rotated to the up position, it cuts off the light signals of the second light zone 52 and the third light zone 53, or turns on the light signals of the second light zone 52 and the third light zone 53, which is 2 on or 2 off;

[0069] When the knob is in the down position, it cuts off the light signals of the first light zone 51, the second light zone 52, and the third light zone 53, or turns on the light signals of the first light zone 51, the second light zone 52, and the third light zone 53, thereby generating electrical signals through the changes in the light signals, which are either 3 on or 3 off.

[0070] The operation is determined by the number of on / off signals, whether it is a push-pull operation or a rotation operation; then the rotation direction of the knob body 2 is determined by the time sequence of the signals generated in the second light zone 52 and the third light zone 53.

[0071] It should be noted that in the description of this invention, all directional indications (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0072] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0073] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A rotary switch with adjustable torsional resistance, comprising a housing and a knob body, the knob body being rotatably mounted on the housing, the knob body and the housing cooperating to form an internal receiving space. A PCB board is fixedly installed within a accommodating space, and a grating frame is rotatably mounted. A photoelectric sensor is mounted on the PCB board, and a light-blocking part is mounted on the grating frame. The grating frame rotates synchronously with a knob body. When the knob body is rotated, the light-blocking part approaches or moves away from the photoelectric sensor. When the light-blocking part approaches the photoelectric sensor, it cuts off the light signal of the photoelectric sensor; when the light-blocking part moves away from the photoelectric sensor, it connects the light signal of the photoelectric sensor. The feature is that: An inductor is fixedly installed within a accommodating space, and a magnetic ring is rotatably mounted thereon. The inductor comprises a metal rod and a coil wound around it. The coil is electrically connected to a PCB board. The metal rod is horizontally positioned inside the magnetic ring, and the magnetic ring rotates synchronously with the knob body. The knob body has a capacitive touch structure. When the knob body receives a human touch grasping signal, the capacitance changes. At this time, the switch outputs a corresponding current to the coil, thereby changing the magnetic force value of the magnetic ring; and the working current supplied to the coil is adjustable. The knob body can also be pushed and pulled out, and drive the grating frame to slide synchronously. The photoelectric sensor has a first light area on its lower side and a second and third light areas side by side on its upper side. The light-blocking part moves up and down when the knob is pushed and pulled out. When the knob is pulled up, the light-blocking part moves upward to correspond to the photoelectric sensor, and the light signal of the first light area on the lower side of the photoelectric sensor is turned on, while the light signals of the second and third light areas on the upper side are turned off. When the knob is pressed down, the light-blocking part moves downward to correspond to the photoelectric sensor, and the light signals of the first light area on the lower side of the photoelectric sensor, as well as the second and third light areas on the upper side, are turned off. When the knob is in the pull-up position, the light-blocking part approaches or moves away from the photoelectric sensor when the knob body is rotated. When the light-blocking part approaches the photoelectric sensor, it cuts off the light signals of the second and third light areas. When the light-blocking part moves away from the photoelectric sensor, it connects the light signals of the second and third light areas. When the knob is in the down position, the light-blocking part approaches or moves away from the photoelectric sensor when the knob body is rotated. When the light-blocking part approaches the photoelectric sensor, it cuts off the light signals of the first light area, the second light area, and the third light area. When the light-blocking part moves away from the photoelectric sensor, it connects the light signals of the first light area, the second light area, and the third light area.

2. A rotary switch with adjustable torsional resistance value according to claim 1, characterized in that: The magnetic ring has a polygonal inner hole, and a metal rod is placed in the inner hole with its end facing the polygonal hole wall.

3. A rotary switch with adjustable torsional resistance value according to claim 1 or 2, characterized in that: The metal rod runs radially along the magnetic ring, passing through the center of the magnetic ring, with its two ends corresponding to the inner ring of the magnetic ring.

4. A rotary switch with adjustable torsional resistance value according to claim 1 or 2, characterized in that: A track body is fixedly installed within the accommodating space. The track body has an upper annular guide groove and a lower annular guide groove in its circumferential direction. A guide post is installed on the grating frame. The grating frame has a groove. A spring is installed in the groove to connect the guide post. The guide post is pressed against the guide groove by the action of the spring. The knob body drives the grating frame to move up and down synchronously, so that the guide post switches between the upper annular guide groove and the lower annular guide groove to realize the stop.

5. A rotary switch with adjustable torsional resistance value according to claim 4, characterized in that: The knob body is connected to the grating frame by a snap-fit ​​or screw. The knob body has a rotating bracket inside. The rotating bracket rotates synchronously with the knob body in the circumferential direction and is fixed in the axial direction. An inner shell is also provided inside the rotating bracket. The inner shell is set on the track body. The track body is located inside the grating frame and is connected and fixed to the PCB board. The magnetic ring is set on the rotating bracket and corresponds to the outer side of the inner shell. The inductor is located in the inner shell, and the end of the metal rod protrudes from the inner shell, thus corresponding to the magnetic ring.

6. A rotary switch with adjustable torsional resistance value according to claim 5, characterized in that: The rotating bracket is axially fixed by the inner shell and the track body respectively. The rotating bracket is limited downward by the track body. The inner ring of the rotating bracket has a support platform for supporting the bottom surface of the magnetic ring. The magnetic ring is set on the support platform and rotates synchronously with the rotating bracket. The outer ring of the inner shell has a boss that can abut against the upper surface of the magnetic ring to limit the upward movement of the rotating bracket.

7. A rotary switch with adjustable torsional resistance value according to claim 5, characterized in that: The lower end of the inner shell has a vertical limiting groove, and the inner circumference of the upper end of the track body has a protrusion. The protrusion is vertically locked in the limiting groove to realize the positioning of the inner shell and the track body. The metal rod end of the inductor passes through the limiting groove, and the magnetic ring corresponds to the limiting groove of the inner shell through which the metal rod end passes.

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