CN209947723U

CN209947723U - Non-contact shaft of key and key

Info

Publication number: CN209947723U
Application number: CN201920364321.8U
Authority: CN
Inventors: 杨晓锋; 邹勤; 朱晶
Original assignee: Dongguan Jing Yang Electronic Technology Co Ltd
Current assignee: Dongguan Jing Yang Electronic Technology Co Ltd
Priority date: 2019-03-21
Filing date: 2019-03-21
Publication date: 2020-01-14
Anticipated expiration: 2029-03-21

Abstract

The utility model discloses a non-contact shaft and button of button, non-contact shaft axis body, axis body top is equipped with the key cap seat, the axis body can stretch into the key seat of button, and can make the axis body reciprocate along the vertical direction in the key seat according to the key cap seat, be equipped with the cylinder boss that divides the axis body into two half sections on the axis body, wear to be equipped with reset spring on the lower half section of axis body; the non-contact type key-in switch is characterized by further comprising an optical displacement sensor, wherein the optical displacement sensor is assembled on a PCB (printed circuit board) arranged at the bottom end of the key base, the optical displacement sensor is arranged to face the central axis of the central shaft body in position and can sense and/or detect the displacement and the position of the vertical movement of the central shaft body, and the non-contact type shaft is keyed in and switched on when the displacement and the position of the vertical movement of the central shaft body are matched with the displacement and the position corresponding to the set switching-on condition.

Description

Non-contact shaft of key and key

Technical Field

The utility model belongs to the technical field of the electronic product technique and specifically relates to a non-contact axle and button of button.

Background

Along with the continuous progress of the life of people, the use of computers is more and more popular in the society, and the computer is an essential article in the life of people. The keyboard is an external device of the computer, the operation performance of the keyboard is gradually improved along with continuous innovation of the technology, and the reliability and the functionality of the keyboard are better and better from mechanical to photoelectric, from photoelectric to optical, and from wired to wireless.

The keyboard is the most common and main input device in a computer system, and letters, numbers, punctuation marks and the like are input into a computer by pressing keys on the keyboard to make or break contacts. The keyboard is divided into a mechanical keyboard and a film keyboard, and the mechanical keyboard has the characteristics of good hand feeling, high controllability, sensitivity, durability and the like, and is deeply loved by game players.

The keys of the mechanical keyboard in the current market all adopt contact keys formed by conducting a contact piece and a contact piece, and the existing contact keys have the defects that the existing keyboard switches can only be conducted once, namely, can only be conducted and disconnected in two states, so that the keyboard has a single input function and poor experience; meanwhile, most of the conduction strokes of the existing keyboard switches are fixed, and the conduction strokes or multipoint strokes of the keys cannot be set, and moreover, the existing contact keys also have the problems of poor product consistency and poor use effect due to the difference of contact spring pieces.

SUMMERY OF THE UTILITY MODEL

The technical problem solved by the utility model is to the defect of existence among the above-mentioned prior art, provide a non-contact axle and button of button, this non-contact axle and button compact structure, stability are good, the product uniformity is good.

According to a first aspect of the present invention, a non-contact shaft of a key comprises a center shaft body, wherein a key cap seat is arranged at the top of the center shaft body, a reset spring for resetting the non-contact shaft is sleeved at the lower part of the center shaft body, the center shaft body can extend into the key seat of the key, and the center shaft body can reciprocate in the key seat along the vertical direction by pressing the key cap seat; the non-contact type key-in switch is characterized by further comprising an optical displacement sensor, wherein the optical displacement sensor is assembled on a PCB (printed circuit board) arranged at the bottom end of the key base, the optical displacement sensor is arranged to face the central axis of the central shaft body in position and can sense and/or detect the displacement and the position of the vertical movement of the central shaft body, and the non-contact type shaft is keyed in and switched on when the displacement and the position of the vertical movement of the central shaft body are matched with the displacement and the position corresponding to the set switching-on condition.

As a further elaboration of the above technical solution:

in the above technical solution, the optical displacement sensor is a digital laser displacement sensor.

According to a second aspect of the present invention, a technical solution adopted by the present invention is that a non-contact key comprises a key seat and an upper cover; the key seat is connected with the upper cover in a buckling way and assembled into a shell, the shell is provided with a containing groove, the bottom end of the key seat is fixedly provided with a PCB (printed Circuit Board), the center of the bottom of the key seat is provided with a via hole, a first via hole is arranged at the position of the PCB opposite to the via hole, the upper cover is provided with a through guide groove, it is characterized by also comprising the non-contact shaft of the key-press of the first aspect, the non-contact shaft is movably embedded and installed in the containing groove, the reset spring of the non-contact shaft is movably connected with the key seat, the key cap seat of the non-contact shaft is movably embedded in the guide groove, and the key cap seat is pressed to enable the middle shaft body of the non-contact shaft to move back and forth along the through hole and the first through hole, the middle shaft body can reciprocate to be matched with the optical displacement sensor of the non-contact shaft to be in inductive contact.

As a further elaboration of the above technical solution:

in the technical scheme, a plurality of buckling grooves are formed in the four sides of the key seat, buckling platforms are formed in the buckling grooves and close to the top end of the key seat, buckles matched with the buckling grooves in position and number are formed in the four sides of the upper cover, and each buckle is embedded in the buckling groove, enables a clamping hook of the buckle to be connected with a matched buckling platform buckle and is matched with the key seat and connected with the upper cover in a buckling mode.

In the above technical solution, the key base is concavely provided with a lower groove, and when the key base is connected with the upper cover in a snap-fit manner, the lower groove is butted with the guide groove and matched to form the accommodating groove; guide grooves are formed in two side walls of the lower groove, guide parts matched with the guide grooves in structure are formed in the outer sides of the keycap bases, the guide parts are embedded in the guide grooves and are matched with the non-contact shafts to be movably embedded and installed in the accommodating grooves.

In the above technical scheme, the inner side wall of the guide groove is further provided with a guide limiting groove, the guide part is movably embedded in the matched guide limiting groove and vertically moves along the guide limiting groove, so that the non-contact shaft can vertically move upwards, and the guide limiting groove is further used for limiting the stroke of the non-contact shaft moving vertically upwards.

In the above technical scheme, the bottom of the key base is further provided with a plurality of positioning columns, the PCB is provided with positioning holes with the number matched with that of the positioning columns, and the positioning columns are clamped in the matched positioning holes so as to fixedly position the key base and the PCB.

According to a third aspect of the present invention, a technical solution adopted by the present invention is that a non-contact key comprises a key seat and an upper cover; the key seat is connected with the upper cover in a buckling way and assembled into a shell, the shell is provided with a containing groove, the bottom end of the key seat is fixedly provided with a PCB (printed Circuit Board), the center of the bottom of the key seat is provided with a via hole, a first via hole is arranged at the position of the PCB opposite to the via hole, the upper cover is provided with a through guide groove, characterized in that the keyboard further comprises a non-contact shaft of the key of the first aspect, the non-contact shaft is movably embedded in the containing groove, a return spring of the non-contact shaft is movably connected with the key seat, the key cap seat of the non-contact shaft is movably embedded in the guide groove, and the key cap seat is pressed to enable the middle shaft body of the non-contact shaft to move back and forth along the through hole and the first through hole, the middle shaft body can reciprocate and can be matched with an optical displacement sensor of the non-contact shaft to be in inductive contact with the middle shaft body; the middle shaft body is provided with a cylindrical boss dividing the middle shaft body into two half sections, the upper half section of the middle shaft body is further provided with a first magnetic element, a second magnetic element capable of moving vertically along the middle shaft body is further sleeved between the first magnetic element and the cylindrical boss, a third magnetic element coaxial with the reset spring is further arranged on the outer side of the reset spring in the accommodating groove, and the third magnetic element is an electrified coil capable of adjusting the size of electrified current.

As a further elaboration of the above technical solution:

in the above technical solution, the first magnetic element is a soft magnet piece, and the second magnetic element is a magnet.

In the above technical solution, after the third magnetic element is not energized or is energized in a reverse direction, a magnetic force is generated between the first magnetic element and the second magnetic element or a repulsive force is generated between the second magnetic element and the third magnetic element, so that the second magnetic element is kept at the upper half section of the bottom bracket body; after the third magnetic element is electrified in the positive direction, magnetic force is generated between the second magnetic element and the third magnetic element and is greater than the magnetic force between the first magnetic element and the second magnetic element, the second magnetic element moves towards the bottom along the middle shaft body and impacts the cylindrical boss, and the pressing-down section falling feeling is generated; the magnetic force between the second magnetic element and the third magnetic element can be adjusted by adjusting the forward and reverse electrifying current of the coil, so that the section induction intensity and the down force degree are changed.

Compared with the prior art, the utility model has the advantages that the non-contact shaft of the utility model detects and/or distinguishes the displacement and the position of the vertical movement of the middle shaft body through the optical displacement sensor, and when the key cap is pressed and the middle shaft body is moved to match with the set position, the non-contact shaft is conducted and matches with the key to be typed; through optical displacement sensor and axis body cooperation, the axle of the button that makes is non-contact, and the switch-on stroke and the switch-on point of axle can set up wantonly, simultaneously, adopts optical displacement sensor, and the button that makes switches on the precision of point is high, the error is little to keep the uniformity of button.

Drawings

Fig. 1 is a perspective view of a non-contact shaft key of the present embodiment 1;

fig. 2 is a front view of the noncontact shaft of this embodiment 1;

FIG. 3 is a perspective view of the non-contact button of the present embodiment 2

FIG. 4 is a perspective view of another non-contact key of the present embodiment 3;

fig. 5 is a front view of fig. 4.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiments described by referring to the drawings are exemplary and intended to be used for explaining the present application and are not to be construed as limiting the present application. In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

Example 1

Referring to fig. 1-2, a non-contact shaft 001 of a key includes a center shaft body 100, a key cap seat 101 is disposed at the top of the center shaft body 100, a return spring 103 for returning the non-contact shaft 001 is sleeved on the lower portion of the center shaft body 100, in an optional embodiment of this embodiment, a cylindrical boss 102 is disposed on the center shaft body 100 and divides the center shaft body 100 into two half sections, the return spring 103 is disposed on the lower half section of the center shaft body 100 in a penetrating manner, one end of the return spring 103 abuts against the cylindrical boss 102, the other end abuts against the key seat of the key, and the return spring 103 is matched to return the non-contact shaft; the middle shaft body 100 can extend into a key seat of a key, the middle shaft body 100 can reciprocate in the key seat along the vertical direction by pressing the key cap seat 101, and the middle shaft body 100 is compressed in the vertical moving process by pressing the key cap seat 101 so as to generate power of vertical rebound of the middle shaft body 100 after the key cap seat 101 is released; the non-contact type middle shaft assembly further comprises an optical displacement sensor 104, in the embodiment, the optical displacement sensor 104 is a digital laser displacement sensor, the optical displacement sensor 104 is assembled on a PCB circuit board arranged at the bottom end of the key base, the optical displacement sensor 104 is arranged to face the central axis of the middle shaft body 100 in position and can sense and/or detect the displacement and the position of the vertical movement of the middle shaft body 100, and the non-contact type shaft 001 is switched on when the displacement and the position of the vertical movement of the middle shaft body 100 are matched with the displacement and the position corresponding to the set conduction condition; it should be noted that, in the actual sensing and/or detecting process, the optical displacement sensor 104 senses the sensing area of the lower half section of the central shaft body 100, and the optical displacement sensor 104 senses the position change and the corresponding displacement of the sensing area of the central shaft body 100, so as to match with the sensing and detecting of the vertical movement of the non-contact shaft 001. For example, within a set time, the vertical movement displacement of the bottom bracket body 100 is S, and two moving end points (detection points) of the bottom bracket body 100 are respectively set as D1 and D2, the optical displacement sensor 104 first senses and reads the position data of the bottom bracket body 100 at the detection point D1, when the bottom bracket body 100 moves to the detection point D2, the optical displacement sensor 104 senses and reads the position data matched with D2, the optical displacement sensor 104 reads the position data of D2 and determines whether the position data is matched with the set conducting point position data, if the position data is matched with the conducting point position data, the bottom bracket body 100 is pressed downwards or rebounded upwards by verifying the displacement between D2 and D1, and whether the bottom bracket body 100 and the shaft are pressed in place is verified.

Example 2

Referring to fig. 2, a non-contact key includes a key pad 200 and an upper cover 201; the key base 200 is buckled with the upper cover 201 and assembled into a shell, a containing groove 202 is formed on the shell, a PCB 203 is fixedly arranged at the bottom end of the key base 200, a through hole 204 is formed in the center of the bottom of the key base 200, a first through hole 205 is formed in the position, opposite to the through hole 204, of the PCB 203, a through guide groove 206 is formed in the upper cover 201, the key further comprises a non-contact shaft 001 of the key in embodiment 1, the non-contact shaft 001 is movably embedded in the containing groove 202, a return spring 103 of the non-contact shaft 001 is movably connected with the key base 200, a key cap base 101 of the non-contact shaft 001 is movably embedded in the guide groove 206, the key cap base 101 is pressed to enable the middle shaft body 100 of the non-contact shaft 001 to reciprocate along the through hole 204 and the first through hole 205, the middle shaft body 100 reciprocates and can be matched with an optical displacement sensor 104 of the non-contact shaft 001 in an inductive contact manner, thereby completing the conduction and typing of the keys.

Referring to fig. 3, in this embodiment, a plurality of fastening grooves 207 are formed on the peripheral side of the key base 200, a fastening platform 208 is formed in each fastening groove 207 near the top end of the key base 200, fasteners 209 matched with the fastening grooves 207 in terms of position and number are formed on the peripheral side of the upper cover 201, and each fastener 209 is embedded in the fastening groove 207 and enables a hook 212 thereof to be fastened with the matched fastening platform 208 to be matched with the key base 200 to be fastened and connected with the upper cover 201; a lower groove 210 is concavely formed on the key seat 200, and when the key seat 200 is connected with the upper cover 201 in a buckling manner, the lower groove 210 is butted with the guide groove 206 and matched to form the accommodating groove 202; guide grooves 211 are formed in two side walls of the lower groove 210, guide parts 105 matched with the guide grooves 211 in structure are formed in the outer side of the keycap base 101, the guide parts 105 are embedded in the guide grooves 211, and the non-contact shaft 001 is movably embedded and mounted in the containing groove 202 in a matched mode; in this embodiment, the inner side wall of the guide groove 206 is further provided with a guide limiting groove 213, the guide portion 105 is movably embedded in the matched guide limiting groove 213 and vertically moves along the guide limiting groove 213, so that the non-contact shaft 001 can vertically move upwards, and the guide limiting groove 213 is further used for limiting a stroke of the non-contact shaft 001 moving vertically upwards; in this embodiment, the bottom of the key seat 200 is further provided with a plurality of positioning posts 214, the PCB 203 is provided with positioning holes 215 with the number matched with the number of the positioning posts 214, and the positioning posts 214 are clamped in the matched positioning holes 215, so that the key seat 200 and the PCB 203 are fixedly connected.

Example 3

Referring to fig. 4-5, a non-contact key, includes a key bed 300 and an upper cover 301; the key base 300 is connected with the upper cover 301 in a buckling manner and assembled into a shell, the shell is provided with a containing groove 302, the bottom end of the key base 300 is fixedly provided with a PCB (printed circuit board) 303, the center of the bottom of the key base 300 is provided with a through hole 304, the PCB 303 is provided with a first through hole 305 opposite to the through hole 304, the upper cover 301 is provided with a through guide groove 306, the key further comprises a non-contact shaft 001 of the key of the embodiment 1, the non-contact shaft 001 is movably embedded in the containing groove 302, a return spring 103 of the non-contact shaft 001 is movably connected with the key base 300, a key cap base 101 of the non-contact shaft 001 is movably embedded in the guide groove 306, the key cap base 101 is pressed to enable the middle shaft body 100 of the non-contact shaft 001 to reciprocate along the through hole 304 and the first through hole, the middle shaft body 100 reciprocates to be matched with the optical displacement sensor 104 of the non-contact shaft 001 in an inductive contact manner, thereby completing the conduction and typing of the keys; the middle shaft body 100 is provided with a cylindrical boss 102 dividing the middle shaft body 100 into two half sections, the upper half section of the middle shaft body 100 is further provided with a first magnetic element 307, a second magnetic element 308 capable of moving vertically along the middle shaft body 100 is further sleeved between the first magnetic element 307 and the cylindrical boss 102, a third magnetic element 309 coaxial with the reset spring 103 is further arranged on the outer side of the reset spring 103 in the accommodating groove 302, and the third magnetic element 309 is an electrified coil capable of adjusting the electrified current; the first magnetic element 307 is a soft magnet piece, and the second magnetic element 308 is a magnet; in this embodiment, the bottom of the key base 300 is further provided with a plurality of positioning posts 310, the PCB 303 is provided with positioning holes 311 with the number matched with the number of the positioning posts 310, the positioning posts 310 are clamped and fixed in the matched positioning holes 311, so that the key base 300 and the PCB 303 are fixedly positioned and connected, meanwhile, in this embodiment, the third magnetic element 309 is not electrified or reversely electrified, and a magnetic force is generated between the first magnetic element 307 and the second magnetic element 308 or a repulsive force is generated between the second magnetic element 308 and the third magnetic element 309, so that the second magnetic element 308 is kept at the upper half section of the bottom bracket body 100; after the third magnetic element 309 is energized in the forward direction, magnetic force is generated between the second magnetic element 308 and the third magnetic element 309 and is greater than the magnetic force between the first magnetic element 307 and the second magnetic element 308, the second magnetic element 308 moves towards the bottom along the middle shaft body 100 and impacts the cylindrical boss 102, and a downward-pressing section falling feeling is generated; adjusting the magnitude of the forward and reverse energizing currents to the coils can adjust the magnitude of the magnetic force between the second magnetic element 308 and the third magnetic element 309, thereby changing the segment's strength of induction and downforce. For further description of the key base 300, the upper cover 301 and the non-contact shaft 001, please refer to embodiment 2, which will not be further described herein.

The technical scope of the present invention is not limited to the above embodiments, and any modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. The non-contact type shaft of the key is characterized by comprising a middle shaft body, wherein a key cap seat is arranged at the top of the middle shaft body, a reset spring for resetting the non-contact type shaft is sleeved at the lower part of the middle shaft body, the middle shaft body can extend into the key seat of the key, and the middle shaft body can reciprocate in the key seat along the vertical direction by pressing the key cap seat; the non-contact type key-in switch is characterized by further comprising an optical displacement sensor, wherein the optical displacement sensor is assembled on a PCB (printed circuit board) arranged at the bottom end of the key base, the optical displacement sensor is arranged to face the central axis of the central shaft body in position and can sense and/or detect the displacement and the position of the vertical movement of the central shaft body, and the non-contact type shaft is keyed in and switched on when the displacement and the position of the vertical movement of the central shaft body are matched with the displacement and the position corresponding to the set switching-on condition.

2. The non-contact shaft for a key of claim 1, wherein said optical displacement sensor is a digital laser displacement sensor.

3. A non-contact key comprises a key seat and an upper cover; the key seat is connected with the upper cover in a buckling way and assembled into a shell, the shell is provided with a containing groove, the bottom end of the key seat is fixedly provided with a PCB (printed Circuit Board), the center of the bottom of the key seat is provided with a via hole, a first via hole is arranged at the position of the PCB opposite to the via hole, the upper cover is provided with a through guide groove, characterized in that the non-contact type shaft of the key-press of claim 2 is further included, the non-contact type shaft is movably embedded and installed in the containing groove, the reset spring of the non-contact shaft is movably connected with the key seat, the key cap seat of the non-contact shaft is movably embedded in the guide groove, and the key cap seat is pressed to enable the middle shaft body of the non-contact shaft to move back and forth along the through hole and the first through hole, the middle shaft body can reciprocate to be matched with the optical displacement sensor of the non-contact shaft to be in inductive contact.

4. A non-contact type key set according to claim 3 wherein a plurality of grooves are formed on the peripheral side of said key base, each groove having a locking platform formed therein at a position adjacent to the top end of said key base, and said upper cover having a plurality of locking hooks formed on the peripheral side thereof and matching in position and number with said grooves, each locking hook being inserted into a groove and having its hook engaged with the matching locking platform, so as to match said key base and said upper cover for locking connection; the key seat is concavely provided with a lower groove, and when the key seat is connected with the upper cover in a buckling manner, the lower groove is butted with the guide groove and matched with the guide groove to form the accommodating groove; guide grooves are formed in two side walls of the lower groove, guide parts matched with the guide grooves in structure are formed in the outer sides of the keycap bases, the guide parts are embedded in the guide grooves and are matched with the non-contact shafts to be movably embedded and installed in the accommodating grooves.

5. The non-contact key according to claim 4, wherein the inner side wall of the guide groove is further provided with a guide limiting groove, the guide portion is movably embedded in the matched guide limiting groove and vertically moves along the guide limiting groove, so that the non-contact shaft can vertically move upwards, and the guide limiting groove is further used for limiting the stroke of the non-contact shaft moving vertically upwards; the bottom of the key seat is also provided with a plurality of positioning columns, the PCB is provided with positioning holes with the number matched with that of the positioning columns, and the positioning columns are clamped in the matched positioning holes so as to fixedly position the key seat and the PCB.

6. A non-contact key comprises a key seat and an upper cover; the key seat is connected with the upper cover in a buckling way and assembled into a shell, the shell is provided with a containing groove, the bottom end of the key seat is fixedly provided with a PCB (printed Circuit Board), the center of the bottom of the key seat is provided with a via hole, a first via hole is arranged at the position of the PCB opposite to the via hole, the upper cover is provided with a through guide groove, characterized in that the key comprises a non-contact shaft of the key of claim 2, the non-contact shaft is movably embedded in the containing groove, a return spring of the non-contact shaft is movably connected with the key seat, the key cap seat of the non-contact shaft is movably embedded in the guide groove, and the key cap seat is pressed to enable the middle shaft body of the non-contact shaft to move back and forth along the through hole and the first through hole, the middle shaft body can reciprocate and can be matched with an optical displacement sensor of the non-contact shaft to be in inductive contact with the middle shaft body; the middle shaft body is provided with a cylindrical boss dividing the middle shaft body into two half sections, the upper half section of the middle shaft body is further provided with a first magnetic element, a second magnetic element capable of moving vertically along the middle shaft body is further sleeved between the first magnetic element and the cylindrical boss, a third magnetic element coaxial with the reset spring is further arranged on the outer side of the reset spring in the accommodating groove, and the third magnetic element is an electrified coil capable of adjusting the size of electrified current.

7. The key as claimed in claim 6, wherein the first magnetic element is a soft magnetic sheet and the second magnetic element is a magnet.

8. The non-contact key of claim 7, wherein the third magnetic element is not energized or is energized in a reverse direction, and a magnetic force is generated between the first magnetic element and the second magnetic element or a repulsive force is generated between the second magnetic element and the third magnetic element, so that the second magnetic element is retained at the upper half section of the bottom bracket body; after the third magnetic element is electrified in the positive direction, magnetic force is generated between the second magnetic element and the third magnetic element and is greater than the magnetic force between the first magnetic element and the second magnetic element, the second magnetic element moves towards the bottom along the middle shaft body and impacts the cylindrical boss, and the pressing-down section falling feeling is generated; the magnetic force between the second magnetic element and the third magnetic element can be adjusted by adjusting the forward and reverse electrifying current of the coil, so that the section induction intensity and the down force degree are changed.

9. The non-contact key as claimed in claim 6, wherein a plurality of grooves are formed on the periphery of the key base, each groove has a button platform formed therein at a position near the top end of the key base, and the periphery of the top cover has a plurality of buttons matching the grooves in position and number, each button is inserted into a groove and has a hook thereof engaged with the corresponding button platform, so that the key base and the top cover are engaged with each other; the key seat is concavely provided with a lower groove, and when the key seat is connected with the upper cover in a buckling manner, the lower groove is butted with the guide groove and matched with the guide groove to form the accommodating groove; guide grooves are formed in two side walls of the lower groove, guide parts matched with the guide grooves in structure are formed in the outer sides of the keycap bases, the guide parts are embedded in the guide grooves and are matched with the non-contact shafts to be movably embedded and installed in the accommodating grooves.

10. The non-contact key according to claim 9, wherein the inner side wall of the guide groove is further provided with a guide limiting groove, the guide portion is movably embedded in the matched guide limiting groove and vertically moves along the guide limiting groove, so that the non-contact shaft can vertically move upwards, and the guide limiting groove is further used for limiting the stroke of the non-contact shaft moving vertically upwards; the bottom of the key seat is also provided with a plurality of positioning columns, the PCB is provided with positioning holes with the number matched with that of the positioning columns, and the positioning columns are clamped in the matched positioning holes so as to fixedly position the key seat and the PCB.