Key structure

Abstract

The utility model discloses a button structure, the button structure comprises a housing, a circuit board and a knob assembly, the housing encloses to form a mounting cavity and a through hole communicated with the mounting cavity, the circuit board is arranged in the mounting cavity, the circuit board is provided with a photosensitive element and a touch pressure point, and the touch pressure point is arranged corresponding to the through hole; the knob assembly comprises a knob and an induction piece, at least part of the knob penetrates through the through hole and extends into the mounting cavity, the induction piece is connected to the part, extending into the mounting cavity, of the knob, and at least part of projection of the induction piece in the axial direction of the through hole is overlapped with the photosensitive element; wherein the knob is pressed to trigger the touch pressing point; and / or, the knob is rotated to drive the induction sheet to trigger the photosensitive element. According to the technical scheme, the abrasion of stepless adjustment of the knob is reduced, and the precision of stepless adjustment of the knob is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of knobs, in particular to a key structure. Background Art

[0002] The stepless adjustment knob is developed to meet people's needs for continuous adjustment of various parameters. The existing stepless adjustment knob is generally achieved by adjusting the potentiometer (rotary or sliding). The user adjusts the potentiometer through the knob so that the resistance value of the potentiometer changes continuously to achieve stepless adjustment. The circuit structure of this adjustment knob is simple, but there are still certain disadvantages: frequent rotation or sliding of the potentiometer will cause wear, causing changes in resistance value, causing nonlinear changes in the potentiometer and noise interference, affecting the adjustment accuracy. Utility Model Content

[0003] The main purpose of the utility model is to provide a key structure, aiming to reduce the wear of the stepless adjustment of the knob and improve the precision of the stepless adjustment of the knob.

[0004] In order to achieve the above-mentioned purpose, the utility model proposes a key structure, which comprises:

[0005] A housing, wherein the housing encloses a mounting cavity and a through hole communicating with the mounting cavity;

[0006] A circuit board, the circuit board is arranged in the mounting cavity, the circuit board is provided with a photosensitive element and a touch point, and the touch point is arranged corresponding to the through hole; and

[0007] A knob assembly, the knob assembly comprising a knob and a sensor sheet, at least a portion of the knob passes through the through hole and extends into the mounting cavity, the sensor sheet is connected to the portion of the knob extending into the mounting cavity, and at least a portion of the projection of the sensor sheet along the axial direction of the through hole overlaps with the photosensitive element;

[0008] The knob is pressed to trigger the touch point; and / or the knob is rotated to drive the sensor sheet to trigger the photosensitive element.

[0009] In one embodiment of the utility model, the knob includes a keycap and a key shaft, one end of the key shaft is connected to the keycap, the other end of the key shaft passes through the through hole and extends into the installation cavity, and the sensor ring is arranged on the key shaft and is located in the installation cavity.

[0010] In one embodiment of the utility model, the key shaft is provided with a card platform, and the card platform is arranged at one end of the key shaft away from the keycap, and the sensor plate abuts against the card platform. The knob also includes a retaining spring, and the retaining spring is arranged on the side of the sensor plate facing away from the card platform and is engaged with the key shaft, and the retaining spring abuts against the sensor plate.

[0011] In one embodiment of the utility model, the sensing sheet includes a connecting portion and a sensing portion that are connected to each other, the connecting portion has a first wall and a second wall that are connected at an angle, the first wall is connected to the knob, the sensing portion is connected to the second wall, and is arranged parallel to the photosensitive element, and the axial projection of the sensing portion along the through hole overlaps with the sensing end of the photosensitive element.

[0012] In an embodiment of the utility model, the knob further includes a plurality of damping members, the shell is enclosed to form a plurality of limiting grooves, the plurality of limiting grooves are arranged around the through hole, the damping member is limited in the limiting grooves and abuts against the key cap.

[0013] In an embodiment of the present invention, a surface of the keycap facing the damping member is provided with corrugated stripes, and one end of the damping member abuts against the corrugated stripes.

[0014] In an embodiment of the present invention, the damping member includes an elastic member and a buffer member, the elastic member is limited in the limiting groove, the buffer member is connected to one end of the elastic member and at least partially extends out of the limiting groove to abut against the keycap.

[0015] In an embodiment of the present utility model, the knob further includes a sleeve, the sleeve is passed through the through hole and connected to the hole wall of the through hole, and the key shaft is passed through the sleeve and extends into the installation cavity.

[0016] In an embodiment of the present invention, the key shaft sleeve is provided with at least two sealing rings, and the two sealing rings are spaced apart on the key shaft and are interference fit with the sleeve.

[0017] In one embodiment of the utility model, the shell is provided with a groove, the through hole is provided at the bottom of the groove, the through hole connects the groove and the mounting cavity, and the keycap is located in the groove so that the side of the keycap facing away from the key shaft is flush with the surface of the shell.

[0018] The technical solution of the utility model is to arrange a photosensitive element on a circuit board, and the circuit board is arranged in an installation cavity. The knob passes through a through hole connected to the installation cavity and extends into the installation cavity and is provided with a sensing sheet. The projection of the sensing sheet along the axial direction of the through hole covers the photosensitive element, and the sensing sheet has uneven convex and concave shapes. When the user turns the knob, the knob drives the sensing sheet to rotate to change the part of the sensing sheet projected to cover the photosensitive element. During the rotation process, the photosensitive element emits a light beam to the part of the sensing sheet projected to cover the photosensitive element, and receives a light beam reflected by the part of the sensing sheet projected to cover the photosensitive element. Since the sensing sheet has uneven convex and concave shapes, the reflection angles of the light beams reflected by various parts of the sensing sheet to the photosensitive element are different, so that the incident angle of the light beam received by the photosensitive element changes, so as to obtain continuous and different signals, thereby realizing stepless adjustment. In this way, the wear of the knob during stepless adjustment is reduced, the precision of stepless adjustment is improved, and the service life of the knob is extended. At the same time, the circuit board is also provided with a touch pressure point corresponding to the through hole, and the touch pressure point is triggered by pressing the knob to realize different functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 This is a structural schematic diagram of a key structure of an embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the exploded structure of a key structure of an embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of a key cap according to an embodiment of the utility model;

[0023] Figure 4 It is a schematic cross-sectional structure diagram of a key structure according to an embodiment of the utility model.

[0024] Description of Figure Numbers:

[0025] Label name Label name 100 Key structure 32 Switches 1 case 321 Card table 11 Mounting cavity 33 Circlip 12 Through Hole 34 Sensor 13 Grooves 341 First Wall 14 Limit slot 342 Second wall 2 Circuit Board 343 Sensing Department 21 Photosensitive element 35 Damping parts 22 Pressure point 351 Elastic parts 3 Knob assembly 352 Buffer 31 keycap 36 Sealing ring 311 Wave stripes

[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] Please combine Figures 1 to 4As shown, the utility model proposes a key structure 100, which includes a shell 1, a circuit board 2 and a knob assembly 3. The shell 1 encloses a mounting cavity 11 and a through hole 12 connected to the mounting cavity 11; the circuit board 2 is arranged in the mounting cavity 11, and the circuit board 2 is provided with a photosensitive element 21 and a touch point 22, and the touch point 22 is arranged corresponding to the through hole 12; the knob assembly 3 includes a knob and a sensor sheet 34, at least part of the knob passes through the through hole 12 and extends into the mounting cavity 11, the sensor sheet 34 is connected to the part of the knob extending into the mounting cavity 11, and at least part of the projection of the sensor sheet 34 along the axial direction of the through hole 12 overlaps with the photosensitive element 21; wherein, the knob is pressed to trigger the touch point 22; and / or, the knob is rotated to drive the sensor sheet 34 to trigger the photosensitive element 21.

[0032] In this embodiment, if Figure 1 , Figure 2 and Figure 4 As shown, the key structure 100 is composed of a housing 1, a circuit board 2 and a knob assembly 3. The circuit board 2 is arranged in a mounting cavity 11 enclosed by the housing 1. A photosensitive element 21 and a touch point 22 are arranged on the circuit board 2. At least part of the knob passes through the through hole 12 and extends into the mounting cavity 11, and has a certain stroke along the extension direction of the through hole 12. The touch point 22 is arranged corresponding to the through hole 12. When the knob outside the mounting cavity 11 is pressed, the knob moves along the extension direction of the through hole 12 to press and trigger the touch point 22, so that the circuit board 2 sends a corresponding signal. At the same time, the knob can rotate around the axial direction of the through hole 12. When the knob is rotated, the sensor sheet 34 is connected to the part of the knob extending into the installation cavity 11, and at least part of the projection of the sensor sheet 34 along the axial direction of the through hole 12 overlaps with the photosensitive element 21. The photosensitive element 21 emits a light beam to the part of the sensor sheet 34 and receives the light beam reflected by the sensor sheet 34, thereby receiving the signal. When the knob is rotated, the sensor sheet 34 located in the installation cavity 11 rotates with the knob, and the part of the light beam emitted by the photosensitive element 21 reflected by the sensor sheet 34 changes, so that the incident angle of the light beam received by the photosensitive element 21 changes continuously to continuously obtain different signals, thereby realizing the stepless adjustment function. Through the cooperation of the photosensitive element 21 and the sensor sheet 34, the wear of the key structure 100 when realizing stepless adjustment can be effectively reduced, and the stepless adjustment accuracy and service life of the key structure 100 can be improved.

[0033] It is understandable that the key structure 100 can be applied to wearable devices, electronic devices or other products using key functions, and no specific limitation is made here. When the key structure 100 is applied to an electronic device, the housing 1 can be the shell of the electronic device. The circuit board 2 in the key structure 100 is electrically connected to other modules in the electronic device, so that different functions of the electronic device can be realized by pressing or rotating the knob.

[0034] Optionally, the sensing sheet 34 may be made of metal and the surface may be sandblasted, so that different parts of the sensing sheet 34 reflect the light beam emitted by the photosensitive element 21 at different angles. The photosensitive element 21 obtains connected and different signals by continuously receiving light beams with different incident angles, thereby achieving stepless adjustment.

[0035] In one embodiment of the present invention, Figure 2 and Figure 4 As shown, the knob includes a key cap 31 and a key shaft 32 , one end of the key shaft 32 is connected to the key cap 31 , and the other end of the key shaft 32 passes through the through hole 12 and extends into the installation cavity 11 . The sensor sheet 34 is arranged around the key shaft 32 and is located in the installation cavity 11 .

[0036] In this embodiment, the knob is composed of a key cap 31 and a key shaft 32. The key cap 31 is located on the outside of the shell 1 for the user to press or rotate. The key shaft 32 is connected to the key cap 31 and extends into the installation cavity 11 through the through hole 12. The sensor sheet 34 is arranged around the part of the key shaft 32 located in the installation cavity 11. The key shaft 32 can move along the extension direction of the through hole 12 to press the touch point 22. The key shaft 32 can rotate around the axis in the through hole 12 to drive the sensor sheet 34 to rotate and cooperate with the photosensitive element 21 to achieve stepless adjustment.

[0037] It can be understood that the key cap 31 and the key shaft 32 are connected as an integral structure in a detachable connection manner, such as a snap connection, a plug-in fit, a screw connection, etc., which is not specifically limited here.

[0038] In one embodiment of the present invention, Figure 2 and Figure 4 As shown, the key shaft 32 is provided with a card platform 321, which is arranged at the end of the key shaft 32 away from the keycap 31, and the sensing sheet 34 abuts against the card platform 321. The knob also includes a retaining spring 33, which is arranged on the side of the sensing sheet 34 facing away from the card platform 321 and is engaged with the key shaft 32, and the retaining spring 33 abuts against the sensing sheet 34.

[0039] In this embodiment, the key shaft 32 is provided with a clamping platform 321, one side of the sensing sheet 34 abuts against the clamping platform 321, and the other side of the sensing sheet 34 abuts against the retaining spring 33 clamped to the key shaft 32, thereby achieving axial limitation of the sensing sheet 34 to prevent the sensing sheet 34 from moving along the axial direction of the key shaft 32 during rotation, thereby affecting the functional coordination with the photosensitive element 21.

[0040] It can be understood that the key shaft 32 is provided with an annular groove, and part of the retaining spring 33 is clamped in the annular groove to improve the reliability of the clamping of the retaining spring 33 and the key shaft 32. The sensing sheet 34 is provided with a mounting hole. When installing the sensing sheet 34, the key shaft 32 is passed through the mounting hole until the sensing sheet 34 abuts against the clamping platform 321, and then the retaining spring 33 abuts against the other side of the sensing sheet 34 and is clamped and fixed with the knob, so that the sensing sheet 34 is annularly arranged on the key shaft 32. The mounting hole of the sensing sheet 34 can be interference fit with the key shaft 32, and / or the retaining spring 33 and the clamping platform 321 cooperate to press the sensing sheet 34, so as to avoid relative rotation between the sensing sheet 34 and the key shaft 32, resulting in the inability of the sensing sheet 34 to rotate synchronously with the key shaft 32, and the key structure 100 cannot achieve stepless adjustment or the stepless adjustment effect is poor.

[0041] In one embodiment of the present invention, Figure 2 and Figure 4 As shown, the sensing sheet 34 includes a connecting portion and a sensing portion 343 connected to each other, the connecting portion has a first wall 341 and a second wall 342 connected at an angle, the first wall 341 is connected to the knob, the sensing portion 343 is connected to the second wall 342, and is arranged parallel to the photosensitive element 21, and the axial projection of the sensing portion 343 along the through hole 12 overlaps with the sensing end of the photosensitive element 21.

[0042] In this embodiment, the sensing sheet 34 is formed by connecting a connecting part and a sensing part 343, the connecting part includes a first wall 341 and a second wall 342, the first wall 341 is connected to one end of the second wall 342, the sensing part 343 is connected to the other end of the second wall 342, and the projection of the sensing part 343 along the axial direction of the through hole 12 overlaps with the photosensitive element 21, that is, the connecting part is used to connect to the knob, and the sensing part 343 is used to cooperate with the photosensitive element 21 to achieve stepless adjustment.

[0043] It can be understood that the sensing part 343 is arranged in parallel with the photosensitive element 21, so that when the sensing piece 34 rotates, the photosensitive element 21 will inject the light beam into the sensing part 343 and receive the light beam reflected by the sensing part 343. The first wall 341 and the sensing part 343 can be arranged in parallel to facilitate the positioning and installation of the sensing piece 34. The first wall 341 can also abut against the hole wall of the through hole 12 located in the installation cavity 11 to limit the stroke of the knob in the through hole 12 and prevent the knob from slipping out of the through hole 12. The first wall 341 and the second wall 342 are arranged at an angle so that the first wall 341 and the sensing part 343 are arranged at intervals. In this way, the sensing part 343 and the second wall 342 enclose a space to form an avoidance space, so as to reduce the installation height of the photosensitive element 21 and the sensing piece 34, and make full use of the space in the installation cavity 11.

[0044] In one embodiment of the present invention, Figure 2 and Figure 4As shown, the knob further includes a plurality of damping members 35 , the housing 1 encloses a plurality of limiting grooves 14 , the plurality of limiting grooves 14 are arranged around the through hole 12 , the damping members 35 are limited in the limiting grooves 14 , and abut against the key cap 31 .

[0045] In this embodiment, a plurality of damping members 35 are arranged around the through hole 12 through the limiting groove 14, and the damping members 35 abut against the keycap 31 to support the keycap 31. At the same time, when the keycap 31 is rotated, friction is generated between the damping member 35 and the keycap 31, providing damping for the rotation of the keycap 31, so that the user can get a better feel.

[0046] It can be understood that each limit groove 14 corresponds to a damping member 35, and the damping members 35 can be three, four, five, etc., and multiple damping members 35 are evenly spaced around the through hole 12 to provide uniform support for the keycap 31 to prevent the keycap 31 from tilting or even getting stuck when rotating. The damping member 35 is directly limited in the limit groove 14, and the cross-sectional shape and size of the limit groove 14 are comparable to the cross-sectional shape and size of the damping member 35 to prevent the damping member 35 from being displaced or overturned, resulting in loss of damping effect.

[0047] In one embodiment of the present invention, Figure 3 As shown, a side of the key cap 31 facing the damping member 35 is provided with a corrugated stripe 311 , and one end of the damping member 35 abuts against the corrugated stripe 311 .

[0048] In this embodiment, the keycap 31 is provided with a corrugated stripe 311, which is a protrusion with uniform intervals. When the knob is rotated, one end of the damping member 35 abuts against the corrugated stripe 311 and continuously passes through the protrusion. In this way, the keycap 31 has a granular feel when rotating, thereby giving the user a better rotation feel.

[0049] It can be understood that the corrugated stripes 311 are arranged around the through hole 12 , and during the rotation of the knob, the damping member 35 always abuts against the corrugated stripes 311 .

[0050] In one embodiment of the present invention, Figure 2 and Figure 4 As shown, the damping member 35 includes an elastic member 351 and a buffer member 352 . The elastic member 351 is limited in the limiting groove 14 . The buffer member 352 is connected to one end of the elastic member 351 and at least partially extends out of the limiting groove 14 to abut against the key cap 31 .

[0051] In this embodiment, the damping member 35 is composed of an elastic member 351 and a buffer member 352. The elastic member 351 is limited in the limiting groove 14. The elastic member 351 provides elastic force for the buffer member 352 so that the buffer member 352 presses the keycap 31, so that the keycap 31 has damping during the rotation process.

[0052] It can be understood that the elastic member 351 located in the limiting groove 14 is always in a compressed state to continuously provide elastic force to the buffer member 352. At least part of the buffer member 352 extends out of the limiting groove 14 and abuts against the keycap 31. When the keycap 31 is pressed, under the condition of applying external force, the keycap 31 moves downward, the buffer member 352 moves toward the limiting cavity, the elastic member 351 is compressed, and the key shaft 32 triggers the touch point 22. When the keycap 31 is released, the elastic member 351 rebounds, the keycap 31 moves upward, and drives the key shaft 32 to leave the touch point 22, and the touch point 22 is no longer triggered. A clamping table 321 can be set outside the installation cavity 11 for the key shaft 32, and the clamping table 321 is abutted with the hole wall of the through hole 12 outside the installation cavity 11, or, through the abutment of the keycap 31 and the housing 1, the downward stroke of the knob is limited to prevent the key shaft 32 from excessively pressing the touch point 22. The key shaft 32 can be abutted against the hole wall of the through hole 12 in the installation cavity 11 through the induction sheet 34 to limit the upward travel of the knob and prevent the knob from slipping out of the through hole 12. At the same time, the key cap 31 presses against the damping member 35 without applying external force, and the elastic member 351 is in a compressed state. The card table 321 and the induction sheet 34 cooperate to control the travel of the key shaft 32 in the axial direction, that is, the pressing travel of the knob, to prevent the touch point 22 from being subjected to too much or too little pressure. Too much pressure can easily damage the touch point 22, and too little pressure can make the touch point 22 unable to be triggered.

[0053] Optionally, the buffer member 352 may be made of rubber or plastic to have a certain friction coefficient to provide appropriate damping for the key cap 31 .

[0054] Optionally, the elastic member 351 can be a spring, and the buffer member 352 includes a limiting portion and an abutting portion. The limiting portion is cylindrical and limited in the through cavity of the spring to achieve the connection between the buffer member 352 and the elastic member 351. The abutting portion includes a first section and a second section connected to each other. The first section is connected to the limiting portion and abuts against the groove wall of the limiting groove 14 to keep the buffer member 352 in a position perpendicular to the axial direction to prevent the buffer member 352 from tilting. At the same time, the limiting portion can be connected to the central position of the first section to make the elastic force provided by the elastic member 351 to the buffer member 352 more uniform. The second section extends out of the limiting cavity and abuts against the keycap 31. The surface of the second section is smoothly set so that the damping provided by the buffer member 352 to the keycap 31 is within a reasonable range, which does not affect the normal rotation of the keycap 31 and can provide a certain damping for the rotation of the keycap 31.

[0055] In an embodiment of the present invention, the knob further includes a sleeve, which is passed through the through hole 12 and connected to the hole wall of the through hole 12 , and the key shaft 32 is passed through the sleeve and extends into the installation cavity 11 .

[0056] In this embodiment, the knob further includes a sleeve, which is inserted into the through hole 12, and the key shaft 32 extends into the installation cavity 11 through the sleeve to reduce the friction force when the key shaft 32 rotates, so that the knob rotates more smoothly.

[0057] It can be understood that the sleeve is made of metal and the shell 1 is made of plastic. When producing the button structure 100, the sleeve is directly placed in the mold, and the shell 1 is generated by injection molding. In this way, the sleeve is connected to the shell 1, and the sealing between the sleeve and the shell 1 can be ensured. At the same time, the friction coefficient of the sleeve is lower, so that the rotation of the knob is smoother.

[0058] In one embodiment of the present invention, Figure 2 and Figure 4 As shown, the key shaft 32 is sleeved with at least two sealing rings 36 , and the two sealing rings 36 are spaced apart on the key shaft 32 and are interference fit with the sleeve.

[0059] In this embodiment, at least two sealing rings 36 are spaced apart on the key shaft 32, and the sealing rings 36 are interference fit with the sleeve to improve the waterproof level between the key shaft 32 and the sleeve, so that the key structure 100 can achieve ATM-level waterproofness.

[0060] It is understandable that a limiting ring groove may be provided on the key shaft 32 , and the sealing ring 36 is limited in the limiting ring groove to prevent the sealing ring 36 from axially moving on the key shaft 32 during the pressing process of the knob, thereby affecting the sealing effect of the sealing ring 36 .

[0061] In one embodiment of the utility model, the shell 1 is provided with a groove 13, and the through hole 12 is provided at the bottom of the groove 13. The through hole 12 connects the groove 13 and the installation cavity 11. The key cap 31 is located in the groove 13 so that the side of the key cap 31 facing away from the key shaft 32 is flush with the surface of the shell 1.

[0062] It can be understood that when the key structure 100 is applied to an electronic device, the key cap 31 is flush with the surface of the housing 1 , which can have a certain hiding effect on the key structure 100 and make the surface of the electronic device more beautiful.

[0063] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the concept of the utility model, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A key structure, characterized in that: The key structure comprises: A housing, wherein the housing encloses a mounting cavity and a through hole communicating with the mounting cavity; A circuit board, the circuit board is arranged in the mounting cavity, the circuit board is provided with a photosensitive element and a touch point, and the touch point is arranged corresponding to the through hole; and A knob assembly, the knob assembly comprising a knob and a sensor sheet, at least a portion of the knob passes through the through hole and extends into the mounting cavity, the sensor sheet is connected to the portion of the knob extending into the mounting cavity, and at least a portion of the projection of the sensor sheet along the axial direction of the through hole overlaps with the photosensitive element; The knob is pressed to trigger the touch point; and / or the knob is rotated to drive the sensor sheet to trigger the photosensitive element.

2. The key structure according to claim 1, characterized in that: The knob comprises a key cap and a key shaft, one end of the key shaft is connected to the key cap, the other end of the key shaft passes through the through hole and extends into the installation cavity, and the induction sheet is arranged around the key shaft and located in the installation cavity.

3. The key structure according to claim 2, characterized in that: The key shaft is provided with a card platform, which is arranged at one end of the key shaft away from the keycap, and the sensor plate abuts against the card platform. The knob assembly also includes a retaining spring, which is arranged on the side of the sensor plate facing away from the card platform and is engaged with the key shaft, and the retaining spring abuts against the sensor plate.

4. The key structure according to claim 1, characterized in that: The sensing sheet includes a connecting portion and a sensing portion connected to each other, the connecting portion has a first wall and a second wall connected at an angle, the first wall is connected to the knob, the sensing portion is connected to the second wall and is arranged parallel to the photosensitive element, and the axial projection of the sensing portion along the through hole overlaps with the sensing end of the photosensitive element.

5. The key structure according to claim 2, characterized in that: The knob assembly further includes a plurality of damping members, the shell is enclosed to form a plurality of limiting grooves, the plurality of limiting grooves are arranged around the through hole, the damping members are limited in the limiting grooves and abut against the key cap.

6. The key structure according to claim 5, characterized in that: A side of the keycap facing the damping member is provided with corrugated stripes, and one end of the damping member abuts against the corrugated stripes.

7. The key structure according to claim 6, characterized in that: The damping member comprises an elastic member and a buffer member, the elastic member is limited in the limiting groove, the buffer member is connected to one end of the elastic member and at least partially extends out of the limiting groove to abut against the key cap.

8. The key structure according to claim 2, characterized in that: The knob assembly also includes a sleeve, which is inserted into the through hole and connected to the hole wall of the through hole. The key shaft is inserted into the sleeve and extends into the installation cavity.

9. The key structure according to claim 8, characterized in that: The key shaft sleeve is provided with at least two sealing rings, and the two sealing rings are clamped on the key shaft at intervals and are interference fit with the sleeve.

10. The key structure according to claim 2, characterized in that: The shell is provided with a groove, the through hole is provided at the bottom of the groove, the through hole connects the groove and the installation cavity, and the key cap is located in the groove so that a side of the key cap facing away from the key shaft is flush with the surface of the shell.

Images