TWI598912B - Keyswitch structure - Google Patents

Description

Button structure

The present invention relates to a button structure, and more particularly to a button structure that utilizes magnetic attraction as a restoring force.

The conventional button structure utilizes an elastic member (such as a silicone dome) disposed under the keycap to provide a keycap restoring force to directly urge the keycap back to its original position (i.e., the position when it is not pressed). In order to provide the user with sufficient press feedback feel (ie, the magnitude of the reaction force experienced by the user when pressed and its variation), the elastic member is generally difficult to reduce in size, making the button structure difficult to apply to a thin keyboard. In addition, the use of an elastic member having a considerable volume also affects the structural strength and stability of other members, such as an elevating mechanism for providing up and down movement of the keycap. This problem will be more serious in a thin keyboard. Therefore, such a button structure is difficult to apply to a thin keyboard unless the stability of the key cap actuation or the feedback feel is compromised or sacrificed.

In view of the problems in the prior art, the present invention provides a button structure that utilizes a magnetic bracket to actuate a button structure to provide a magnetic attraction for the support of the keycap to act as a restoring force of the keycap. The button structure does not need to be set and operated as required by the conventional silicone round, and can provide sufficient pressing and feedback feeling for the user.

The button structure according to the present invention comprises a keycap, a base, a first bracket and a third bracket. The first bracket is disposed between the keycap and the base, and the first bracket includes a first magnetic attraction portion supported by the first bracket and moved up and down relative to the base via the first bracket. The third bracket is disposed between the keycap and the base and includes a support portion and a second magnetic attraction portion. The third bracket is supported on the base by the support portion, and the second magnetic attraction portion is located at the key A magnetic attraction is generated between the cap and the first magnetic attraction and between the first magnetic attraction. Wherein, when the key cap is not pressed by an external force, the magnetic attraction drives the first magnetic attraction portion and the second magnetic attraction portion to be close to each other, so that the first bracket and the third bracket are stably supported on the base, and when When the keycap is pressed against the base by an external force, the first bracket rotates toward the base such that the first magnetic portion and the second magnetic portion are distant from each other. In practice, the magnitude of the magnetic attraction is not necessarily determined only by the size of the interacting structure, but also by the material of the structure, so that the structure for generating the magnetic attraction can occupy only a relatively small space. And actuating, this feature helps to avoid excessively affecting the structural strength and actuation stability of the first bracket, and thus contributes to implementation in a thin button structure. Moreover, the magnetic attraction is non-linearly reduced as the distance between the two magnetic portions increases, and this characteristic helps to provide a user with a significant feedback feel. Moreover, the magnetic attraction can be easily changed to obtain a desired size by changing the material of the two magnetic portions, that is, providing sufficient feedback force for the user.

Therefore, compared with the prior art, the button structure according to the present invention can provide the user with sufficient press feedback feel (ie, the magnitude of the reaction force felt by the user when pressed and its change), and is suitable for a thin design, so the present invention can Effectively solve the dilemma faced by the current thin keyboard design in the prior art.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

Please refer to Figure 1 to Figure 3. According to an embodiment of the invention, the button structure 1 comprises a keycap 10, a base 12, a lifting mechanism 14 and a third bracket 16. The keycap 10 is disposed on the base 12, and the lifting mechanism 14 is coupled between the keycap 10 and the base 12 such that the keycap 10 can be moved up and down relative to the base 12 via the lifting mechanism 14. The third bracket 16 is disposed between the keycap 10 and the base 12, and the third bracket 16 interacts with the lifting mechanism 14 by magnetic attraction to provide a driving force required to reset the keycap 10. Thereby, the button structure 1 according to the present invention does not need to use a conventional elastic member (for example, a rubber dome) to provide the restoring force required for the keycap 10, and the lifting mechanism 14 can still obtain a relatively large installation space, which helps to lift and lower. The structural strength and actuation stability of the mechanism 14.

Further, the base 12 includes a bottom plate 122 and a circuit board 124 (such as a thin film circuit board) stacked on the bottom plate 122. The circuit board 124 has a switch 1242 (indicated by a dotted circle in FIG. 3) . The lifting mechanism 14 includes a first bracket 142 and a second bracket 144 disposed between the keycap 10 and the base 12. The two ends 142a, 142b of the first bracket 142 are rotatably connected to the bottom plate of the connecting portion 102 of the keycap 10 and the connecting portion 1222 of the second bracket 144, respectively. The two ends 144a, 144b of the second bracket 144 are rotatably connected to the key caps, respectively. The connecting portion 104 of the connecting portion 104 and the connecting portion 1224 of the bottom plate 122, the first bracket 142 and the second bracket 144 are pivotally connected to each other and form a scissor structure, so that the key cap 10 is supported on the first bracket 142 and the second bracket 144 and passes through the first A bracket 142 and a second bracket 144 move up and down relative to the base 12. The first bracket 142 includes a first magnetic attraction portion 1422. The third bracket 16 includes a second magnetic attraction portion 162, a support portion 164 and an extension arm 166 connected to each other. The third bracket 16 utilizes the through hole 142c of the first bracket 142 to extend the support portion 164 downward. The third bracket 16 is supported on the base 12 (or the bottom plate 122) by a support portion 164. The second magnetic attraction portion 162 is located between the keycap 10 and the first magnetic attraction portion 1422. The extension arm 166 is located at the keycap 10 and the first bracket. Between 142. In this embodiment, the frame 1420 of the first bracket 142 is a plastic piece, and the first magnetic portion 1422 is a magnet embedded in the frame 1420; the third frame 16 is entirely made of a magnetic material (which may be a magnetized material). Or a material that can be magnetized, so that a magnetic interaction can be generated between the second magnetic portion 162 and the first magnetic portion 1422. In practice, the first magnetic portion 1422 can also be made of a magnetic material, and the second magnetic portion 162 can be modified by a magnet. For example, the third bracket 16 is still made of a metal plate as a whole, and a magnet is adhered. As the second magnetic attraction portion 162. In addition, the magnetic attraction portions 1422 and 162 are not limited to a single material structure, and the composite structure may be used. In addition, in the embodiment, the end portion 142b of the first bracket 142 extends outward along the rotating shaft (ie, the axial direction substantially corresponding to the relative rotation of the first bracket 142 and the connecting portion 1222) at the connection with the connecting portion 1222. The stud 142d helps to improve the stability of the rotation of the first bracket 142 relative to the connecting portion 1222.

Please refer to FIG. 4 to FIG. 6 , wherein the hidden contour of the support portion 164 is shown in broken lines in the figure. In the button structure 1, when the keycap 10 is pressed by an external force F0 (indicated by an arrow in the figure) toward the base 12, the keycap 10 is from an initial position (corresponding to when the keycap 10 is not pressed, such as Figure 4) moves through a trigger position (as shown in Figure 5) to a pressed position (as shown in Figure 6). The second magnetic attraction portion 162 is disposed opposite to the first magnetic attraction portion 1422 and generates a magnetic attraction force F1 (indicated by double arrows in the drawing), so that the second magnetic attraction portion 162 and the first magnetic attraction portion 1422 have a tendency to be close to each other. . When the keycap 10 is not pressed by the external force F0, the magnetic attraction force F1 drives the first magnetic attraction portion 1422 to approach the second magnetic attraction portion 162, so that the keycap 10 returns to the initial position from the pressing position, the trigger position, and the first bracket 142. The third bracket 16 is stably supported on the base 12. In the present embodiment, the first magnetic attraction portion 1422 and the second magnetic attraction portion 162 are not closely adhered to each other due to the actual structural configuration, but the magnetic attraction force F1 is still sufficient to stabilize the first bracket 142 and the third bracket 16 Combine. In practice, the first magnetic portion 1422 and the second magnetic portion 162 can be closely adhered to each other by changing the structural configuration, and the first bracket 142 and the third bracket 16 can be combined to be combined by the magnetic attraction force F1. stability. In terms of the mechanism logic, the first bracket 142 and the third bracket 16 transmit a temporary fixed connection structure through the attraction of the first magnetic portion 1422 and the second magnetic portion 162, and the first bracket 142 has an end portion thereof. The 142b is connected to the bottom plate 122, and the third bracket 16 abuts against the bottom plate 122 by the support portion 164. Therefore, the first bracket 142 and the third bracket 16 form a state-fixed structure, and can be stably supported on the base 12. When the keycap 10 is pressed against the base 12 by the external force F0 (for example, the user presses the keycap 10 with a finger), the first bracket 142 is rotated toward the base 12 such that the first magnetic portion 1422 and the second magnetic portion 162 are away from each other. At this time, the first bracket 142 and the third bracket 16 are no longer fixed connection structures, but can move relative to each other.

The extension arm 166 is placed on the first bracket 142. The extension arm 166 has a triggering portion 166a extending downward from the through hole 142e of the first bracket 142 (ie, protruding toward the switch 1242), so that when the keycap 10 is subjected to an external force F0, The triggering portion 166a can trigger the switch 1242 when pressed against the base 12. In this embodiment, the support portion 164 abuts the bottom plate 122, so the abutment can be regarded as the center of rotation of the third bracket 16 relative to the bottom plate 122, that is, the fulcrum (indicated by a cross mark in the figure). The projection of the extension arm 166, the second magnetic attraction portion 162 and the fulcrum on the bottom plate 122 shows that the center of mass of the second magnetic attraction portion 162 is located between the center of mass and the fulcrum of the extension arm 166, so that the magnetic attraction force F1 is in principle The support portion 164 is urged to remain abutted against the bottom plate 122 and the extension arms 166 are in principle held against the first bracket 142. 4 to FIG. 6 , the first bracket 142 rotates clockwise during the movement of the keycap 10 from the initial position to the pressing position by the external force F0, and the first magnet 142 rotates clockwise, the first magnetic attraction. The portion 1422 is away from the second magnetic attraction portion 162. The third bracket 16 has a tendency to rotate counterclockwise by the action of the magnetic attraction force F1, and the extension arm 166 remains in contact with the first bracket 142 before the trigger portion 166a contacts the switch 1242. When the keycap 10 is in the trigger position, the trigger portion 166a contacts and triggers the switch 1242. After the trigger portion 166a contacts the switch 1242, although the first bracket 142 continues to rotate with the downward movement of the keycap 10, the third bracket 16 does not rotate in principle, and the extension arm 166 is separated from the first bracket 142. When the keycap 10 is moved from the trigger position to the pressed position, the trigger portion 166a holds the contact switch 1242. In addition, when the keycap 10 moves from the trigger position to the pressing position, the third bracket 16 does not rotate in principle, so the triggering force of the trigger portion 166a on the switch 1242 does not substantially increase (ignoring the change of the magnetic force F1 to the trigger) The effect of the force applied), which protects the structure of the switch 1242 and extends the service life. In addition, when the keycap 10 is moved from the initial position to the trigger position, the extension arm 166 is subjected to the magnetic attraction force F1, and a force F2 (shown by an arrow in the figure) is applied to the first bracket 142 to facilitate the first The clockwise rotation of the bracket 142. When the keycap 10 is not pressed by the external force F0 (for example, the user's finger moves away from the keycap 10), the magnetic attraction force F1 drives the first magnetic attraction portion 1422 and the second magnetic attraction portion 162 to be close to each other, so that the first bracket 142 and the third bracket The 16-phase contact and stable support on the base 12 (as shown in FIG. 4); wherein the magnetic force F1 drives the first bracket 142 to rotate counterclockwise and simultaneously drives the third bracket 16 to rotate clockwise, so that the keycap 10 is self-pressing position, Revert to the initial position after the trigger position.

In the embodiment, when the key structure 10 passes the trigger position, the triggering portion 166a triggers the switch 1242, so that a two-stage pressing operation can be provided, and the multi-style input of the key structure 1 is increased (for example, the key structure 1 has another one). The triggering portion is configured to trigger another switch of the circuit board 124 when the keycap 10 is in the pressing position. However, the invention is not limited thereto. For example, by designing the triggering portion 166a to protrude the length of the first bracket 142 or the setting position of the switch 1242 (or the triggering portion 166a), the triggering position coincides with the pressing position, that is, the keycap 10 has only two states (ie, being pressed or Not pressed).

Referring to FIGS. 7-9, the cross-sectional positions of FIGS. 8 and 9 correspond to the positions of lines X-X in FIG. 1, and the hidden contours of the support portions 164 are shown in broken lines in the drawings. The button structure 3 is substantially the same as the button structure 1, so that the button structure 3 follows the component symbol of the button structure 1. For the description of the components in the button structure 3, please also refer to the description of the same named component in the button structure 1. The main difference between the button structure 3 and the button structure 1 is that the third bracket 36 of the button structure 3 no longer bears the actuation of the trigger switch 1242, but is borne by the first bracket 342 of the lifting mechanism 34 of the button structure 3. The first bracket 342 corresponding to the switch 1242 includes a trigger portion 142f, and the trigger portion 142f protrudes from the frame body 1420 toward the switch 1242. When the keycap 10 is pressed by the external force F0 to move toward the base 12, the trigger portion 142f triggers the switch 1242. In the present embodiment, the keycap 10 has only two positions, one is the initial position (ie, when the keycap 10 is not pressed), and the other is the pressing position, which is also the trigger position (ie, after the keycap 10 is pressed). In addition, in the embodiment, the third bracket 36 still retains the extension arm 166, so when the keycap 10 moves from the initial position to the pressing position (or the trigger position), the extension arm 166 is subjected to the magnetic attraction force F1 to maintain contact. And applying a force F2 (indicated by an arrow in the figure) to the first bracket 342 also contributes to the clockwise rotation of the first bracket 342.

Referring to Figures 10 through 12, the cross-sectional positions of Figures 11 and 12 correspond to the positions of lines X-X in Figure 1. The key structure 5 is substantially the same as the key structure 3, so the key structure 5 follows the component symbol of the key structure 3. For the description of the components of the key structure 5, please also refer to the description of the same named component in the key structure 3. The main difference between the button structure 5 and the button structure 3 is that the third bracket 56 of the button structure 5 has no extension arm 166 except for the action of the trigger switch 1242, so the first bracket 542 of the lifting mechanism 54 of the button structure 5 is only The second magnetic attraction portion 162 of the third bracket 56 interacts; wherein the hidden contour of the support portion 564 is shown in broken lines in FIGS. 11 and 12. Similarly, the third bracket 56 can still provide the restoring force of the keycap 10 through the magnetic attraction force F1 generated between the second magnetic attraction portion 162 and the first magnetic attraction portion 1422 and the first bracket 34 when the keycap 10 is not pressed. A stable support structure is formed on the base 12. In addition, in the embodiment, the third bracket 56 does not need to move with the movement of the keycap 10 relative to the base 12, and the third bracket 56 is fixed to the bottom plate 122 by the support portion 564, wherein the support portion 564 is stuck to the bottom plate 122. The stud is between 1226. However, the present invention is not limited thereto. For example, the third bracket 56 is still rotatably coupled to the bottom plate 122, such as the support portion 164 of the third bracket 16, 36 abutting the bottom plate 122.

In the foregoing embodiment, the third brackets 16 and 36 are exemplified by the support portion 164 abutting the bottom plate 122, but the invention is not limited thereto. In principle, only the third brackets 16 and 36 are rotatably supported on the base 12, and the abutting manner is not limited thereto, so that when the keycap 10 is subjected to the external force F0 toward the base 12, the magnetic force F1 drives the extension arm 166. The first brackets 142, 342 are urged toward the base 12. For example, pivoting, or connecting the third brackets 16, 36 and the bottom plate 122 with a flexible connecting structure or material, the aforementioned rotatably connected, thereby enabling the third brackets 16, 36 to rotate relative to the base 12.

In addition, when the third bracket (for example, the third bracket 36, 56) is not required to be used for the trigger switch 1242, the third bracket does not need to rotate with the up and down movement of the keycap 10; in other words, the third bracket can be fixed relative to the base 12. The manner of setting, for example, adhering to the base 12 (or the bottom plate 122), protrudes upward from a portion of the bottom plate 122 to form a third bracket (for example, stamped and formed by a metal plate member, and simultaneously forms the bottom plate 122 and the third bracket 56', as shown in FIG. Shown).

In addition, in the foregoing embodiments, the keycap 10 is horizontally supported on the base 12 via the first bracket 142 and the second bracket 144, but the invention is not limited thereto. In practice, the up and down movement of the keycap 10 relative to the base 12 is not limited to horizontal movement up and down, and the keycap 10 can swing up and down to have different positions relative to the base 12, so that the up and down swing of the keycap 10 can also be visually included. 10 moves up and down relative to the base 12. Referring to FIGS. 14-16, the cross-sectional positions of FIGS. 14-16 correspond to the positions of lines X-X of FIG. 1, wherein the hidden outline of the support portion 164 is shown in broken lines in the figure. The button structure 7 is substantially the same as the button structure 1, so that the button structure 7 follows the component symbol of the button structure 1. For the description of the components in the button structure 7, please also refer to the description of the same named component in the button structure 1. The main difference between the button structure 7 and the button structure 1 is that the button structure 7 uses only the first bracket 142 as the lifting mechanism, the end portion 142a of the first bracket 142 is connected to one side of the keycap 10, and the other side of the keycap 10 is directly It is slidably placed on the base 12. In other words, the keycap 10 is supported by the first bracket 142 and swings up and down with respect to the base 12 via the first bracket 142. In practice, the other side of the keycap 10 can be coupled to the base 12 via a structure that permits the keycap 10 to rotate relative to the base 12. Thereby, when the keycap 10 is pressed by the external force F0 and moved from an initial position (corresponding to the keycap 10 is not pressed, as shown in FIG. 14), through a trigger position (as shown in FIG. 15) to a pressing position. (As shown in FIG. 16), while the other side of the keycap 10 slides on the base 12, the keycap 10 can still have different positions, so that the button structure 7 can also have the same actuation logic as the button structure 1, and provide Two-stage pressing operation. Similarly, when the external force F0 is removed from the keycap 10, it is subjected to the magnetic attraction force F1 between the second magnetic attraction portion 162 and the first magnetic attraction portion 1422, and the keycap 10 is returned to the initial position from the pressed position and the triggered position.

In the button structure 7, the setting structure of the keycap 10 can also be applied to the aforementioned button structures 3, 5, and will not be described again. In addition, in practice, the lifting mechanism according to the present invention can also use a single bracket (as the first bracket) and a structure that vertically moves with a guiding keycap, and can also generate horizontal and vertical movement of the keycap, for example, a button structure. In 7, a guide groove (fixed to the base) is used to guide the movement of the other side of the keycap 10 in the vertical direction. Other possible implementations can be easily accomplished by those skilled in the art based on the description of the foregoing embodiments and the conventional button structure, and are not described again. The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

<TABLE border="1" borderColor="#000000" width="_0002"><TBODY><tr><td> 1,3,5,7 </td><td> Button structure</td></ Tr><tr><td> 10 </td><td> Keycap</td></tr><tr><td> 102,104 </td><td> Connections</td></ Tr><tr><td> 12 </td><td> pedestal</td></tr><tr><td> 122 </td><td> backplane</td></tr><tr ><td> 1222,1224 </td><td> Connections</td></tr><tr><td> 1226 </td><td> Columns</td></tr><tr ><td> 124 </td><td> Board </td></tr><tr><td> 1242 </td><td> Switch </td></tr><tr><td > 14 </td><td> Lifting Mechanism</td></tr><tr><td> 142, 342, 542 </td><td> First Support</td></tr><tr ><td> 142a, 142b </td><td> End </td></tr><tr><td> 142c, 142e </td><td> Through Hole</td></tr> <tr><td> 142d </td><td> Stud </td></tr><tr><td> 142f </td><td> Trigger </td></tr><tr ><td> 1420 </td><td> frame body</td></tr><tr><td> 1422 </td><td> first magnetic part </td></tr>< Tr><td> 144 </td><td> second bracket</td></tr><tr><td> 144a, 144b </td><td> end </td></tr> <tr><td> 16, 36, 56 </td><td> Third bracket</td></tr><tr><td> 162 </t d><td> second magnetic attraction</td></tr><tr><td> 164, 564 </td><td> support </td></tr><tr><td> 166 </td><td> Extension Arm</td></tr><tr><td> 166a </td><td> Trigger </td></tr><tr><td> F0 < /td><td> External force</td></tr><tr><td> F1 </td><td> Magnetic attraction</td></tr><tr><td> F2 </td> <td> Force</td></tr></TBODY></TABLE>

1 is a schematic diagram of a key structure in accordance with an embodiment of the present invention. Figure 2 is a partial exploded view of the button structure of Figure 1. Figure 3 is an exploded view of the button structure of Figure 1. 4 is a cross-sectional view of the button structure of FIG. 1 taken along line X-X when the keycap is not pressed by an external force and is in an initial position. FIG. 5 is a cross-sectional view of the button structure of FIG. 1 taken along line X-X when the keycap is pressed by an external force and moved to a trigger position. 6 is a cross-sectional view of the button structure of FIG. 1 taken along line X-X when the keycap is pressed by an external force and moved to a pressed position. Figure 7 is an exploded view of a key structure in accordance with another embodiment of the present invention. Figure 8 is a cross-sectional view of the button structure of Figure 7 when its keycap is not pressed by an external force. Figure 9 is a cross-sectional view of the button structure of Figure 7 when its keycap is pressed by an external force. Figure 10 is an exploded view of a key structure in accordance with another embodiment of the present invention. Figure 11 is a cross-sectional view of the button structure of Figure 10 when its keycap is not pressed by an external force. Figure 12 is a cross-sectional view showing the key structure of Figure 10 when its keycap is pressed by an external force. Figure 13 is a schematic illustration of a combination of a base plate and a third bracket in accordance with an embodiment. Figure 14 is a cross-sectional view showing a key structure in an initial position in which the keycap is not pressed by an external force according to another embodiment of the present invention. Figure 15 is a cross-sectional view of the button structure of Figure 14 when its keycap is pressed by an external force to move to a trigger position. Figure 16 is a cross-sectional view showing the key structure of Figure 14 when its keycap is pressed by an external force to move to a pressed position.

<TABLE border="1" borderColor="#000000" width="_0003"><TBODY><tr><td> 1 </td><td> Key structure</td></tr><tr>< Td> 10 </td><td> key cap</td></tr><tr><td> 102,104 </td><td> connection section</td></tr><tr>< Td> 12 </td><td> pedestal</td></tr><tr><td> 122 </td><td> bottom plate</td></tr><tr><td> 1222 1224 </td><td> Connections</td></tr><tr><td> 124 </td><td> Board </td></tr><tr><td> 1242 < /td><td> Switch</td></tr><tr><td> 142a, 142b </td><td> End </td></tr><tr><td> 142e </ Td><td> through hole</td></tr><tr><td> 1420 </td><td> frame body</td></tr><tr><td> 1422 </td> <td> First magnetic attraction</td></tr><tr><td> 144 </td><td> Second support</td></tr><tr><td> 144a, 144b </td><td> end </td></tr><tr><td> 162 </td><td> second magnetic attraction</td></tr><tr><td> 164 </td><td> Support </td></tr><tr><td> 166 </td><td> Extension Arm</td></tr><tr><td> 166a < /td><td> Trigger </td></tr><tr><td> F1 </td><td> Magnetic Susceptibility</td></tr><tr><td> F2 </td ><td> Force</td></tr></TBODY></TABLE>

Claims (10)

A button structure, comprising: a keycap; a base; a first bracket disposed between the keycap and the base and including a first magnetic attraction portion, the keycap is supported by the first bracket and via the first a bracket is moved up and down relative to the base; and a third bracket is disposed between the keycap and the base and includes a support portion and a second magnetic attraction portion, wherein the third bracket is supported by the support portion a second magnetic attraction portion is located between the keycap and the first magnetic attraction portion and generates a magnetic attraction force between the first magnetic attraction portion; wherein, when the keycap is not pressed by an external force, the The magnetic attraction drives the first magnetic portion to be close to the second magnetic portion, so that the first bracket and the third bracket are stably supported on the base, and when the key cap is pressed by an external force and moves toward the base The first bracket is rotated toward the base such that the first magnetic portion and the second magnetic portion are away from each other. The button structure of claim 1, wherein the third bracket comprises an extending arm, the extending arm is located between the key cap and the first bracket, and the third bracket is rotatably supported by the base by the supporting portion The magnetic force drives the extension arm to urge the first bracket toward the base when the keycap is pressed against the base by the external force. The button structure of claim 2, wherein the base comprises a switch, the extension arm has a trigger portion protruding toward the switch, and the trigger portion triggers when the key cap is pressed by the external force toward the base switch. The button structure of claim 3, wherein the keycap moves from an initial position to a pressing position when the keycap is pressed by the external force toward the base, when the keycap passes The trigger portion triggers the switch when the position is triggered. The button structure of claim 2, wherein the base comprises a switch, the first bracket includes a trigger portion protruding toward the switch, and the trigger portion is triggered when the key cap is pressed by the external force to move toward the base The switch. The button structure of claim 2, wherein the extension arm remains in contact with the first bracket. The button structure of claim 1, wherein the magnetic attraction drives the first magnetic portion and the second magnetic portion closer to each other when the keycap is not pressed by an external force, so that the first bracket and the third bracket Contact and stable support on the base. The button structure of claim 1, wherein the base comprises a bottom plate, and a portion of the bottom plate protrudes upward to form the third bracket. The button structure of any one of claims 1-8, further comprising a second bracket disposed between the keycap and the base, the keycap being supported on the first bracket and the second bracket and via The first bracket and the second bracket move up and down with respect to the base. The button structure of claim 9, wherein the first bracket and the second bracket are pivotally connected.