Key structure

Abstract

The utility model discloses a key structure, it contains key cap, bottom plate, support mechanism, set up in the thin film circuit board of bottom plate, elastomer, actuator and sounding unit. Support mechanism movably connects between key cap and bottom plate. Elastomer abuts at key cap and bottom plate and has annular base, bridging structure and intermediate column body, annular base extends upward and forms annular vertical wall part, bridging structure is connected to intermediate column body from annular vertical wall part horizontally to support intermediate column body to hang in the air. Actuator extends from support mechanism to bottom plate. Sounding unit contains sounding piece and support seat, sounding piece has the extension arm of the extension of the beaten part corresponding support seat. When key cap is pressed, intermediate column body presses against thin film circuit board and makes bridging structure flexure deformation to provide linear feedback feeling, and actuator presses against extension arm and bounces and hits beaten part to get rid of actuator. The utility model can effectively improve the key cap pressing feeling of key structure.

Description

Technical Field

[0001] This utility model relates to a button structure, and more particularly to a button structure with linear feedback feel. Background Technology

[0002] In existing technologies, keyboards have high key switches and actuation travel, and the key housings have sufficient structural space to install torsion springs or contact springs as tactile and / or sound-producing elements. The key switches can also be designed with protruding structures to interfere with the tactile / sound-producing elements. However, simply transplanting tactile / sound-producing elements into ultra-thin keys with low key heights presents many technical challenges.

[0003] For example, adding tactile / sound components to keys can easily result in uneven upward resistance on the bottom surface of the keycap, causing inconsistent pressing feel in each corner of the keycap and preventing the provision of linear feedback. Furthermore, designing keys with adjustable tactile / sound means squeezing out extra space within the low, thin keycap area, which poses a significant challenge to the structural strength of the already ultra-thin keycap components. Utility Model Content

[0004] In view of the problems in the prior art, the present invention provides a button structure to solve the above problems.

[0005] Therefore, the technical problem to be solved by this utility model is to provide a button structure, which includes:

[0006] keycap;

[0007] The base plate is located below the keycap;

[0008] A support mechanism is movably connected between the keycap and the base plate, allowing the keycap to move up and down relative to the base plate;

[0009] A thin-film circuit board, which is disposed on the base plate and has a trigger switch;

[0010] An elastomer abuts between the keycap and the base plate to drive the keycap to move away from the base plate. The elastomer has an annular base, a bridging structure and a central column. The annular base extends upward to form an annular vertical wall portion. The bridging structure extends horizontally from the annular vertical wall portion to the central column to support the central column in suspension, so that the central column triggers the trigger switch downward when the keycap is pressed.

[0011] An actuator formed in the support mechanism and extending toward the base plate; and

[0012] A sound-generating unit is provided corresponding to the actuator. The sound-generating unit includes a sound-generating element and a support base. The support base has a strike-receiving part. The sound-generating element is provided on the support base and has an extension arm that extends corresponding to the strike-receiving part.

[0013] When the keycap is pressed, it presses down on the elastic body, causing the central pillar to press against the thin film circuit board and the bridging structure to flex and deform to provide a linear feedback feel. The keycap also drives the support mechanism to move so that the actuator presses down on the extension arm, causing the extension arm to break free from the actuator's pressure and bounce upward to strike the impacted part to produce a sound.

[0014] As an optional technical solution, the support mechanism includes a first bracket and a second bracket, which are movably connected to the keycap and the base plate and pivotally connected to each other, and the actuator is formed in the first bracket.

[0015] As an optional technical solution, the support can move relative to the base, so that the sound-generating element is selectively located in an interference position or a non-interference position; when the sound-generating element is located in the interference position, the extension arm is pressed by the actuator to generate the sound; when the sound-generating element is located in the non-interference position, the extension arm is not pressed by the actuator and does not generate the sound.

[0016] As an optional technical solution, the base plate has an opening, and the sound-generating unit further includes an adjustment plate, which is movably disposed below the base plate and the support is disposed on the adjustment plate to protrude from the base plate through the opening, so that the sound-generating element can be selectively located in the interference position or the non-interference position as the adjustment plate moves.

[0017] This utility model also provides a button structure, which includes:

[0018] keycap;

[0019] The base plate is located below the keycap;

[0020] A support mechanism is movably connected between the keycap and the base plate, allowing the keycap to move up and down relative to the base plate;

[0021] A thin-film circuit board, which is disposed on the base plate and has a trigger switch;

[0022] An elastomer abuts between the keycap and the base plate to drive the keycap to move away from the base plate. The elastomer has an annular base, a bridging structure and a central column. The annular base extends upward to form an annular vertical wall portion. The bridging structure extends horizontally from the annular vertical wall portion to the central column to support the central column in suspension, so that the central column triggers the trigger switch downward when the keycap is pressed.

[0023] An actuator formed in the support mechanism and extending toward the base plate; and

[0024] Feedback unit, which is provided in relation to the actuator, includes a feedback element and a support base. The support base has an upright guide groove. The feedback element is disposed on the support base and has an extension arm that extends and inserts into the upright guide groove.

[0025] When the keycap is pressed, it presses down on the elastomer, causing the central pillar to press against the thin-film circuit board and flex the bridging structure. The keycap also drives the support mechanism to move, causing the actuator to press down on the extension arm. This causes the extension arm to move downward along the vertical guide groove and, together with the elastomer, provide linear feedback.

[0026] As an optional technical solution, the support mechanism includes a first bracket and a second bracket, which are movably connected to the keycap and the base plate and pivotally connected to each other, and the actuator is formed in the first bracket.

[0027] As an optional technical solution, the support can move relative to the base, so that the feedback element is selectively located in an interference position or a non-interference position; when the feedback element is located in the interference position, the extension arm is pressed against by the actuator; when the feedback element is located in the non-interference position, the extension arm is not pressed against by the actuator.

[0028] As an optional technical solution, the base plate has an opening, and the feedback unit further includes an adjustment plate, which is movably disposed below the base plate and the support is disposed on the adjustment plate to protrude from the base plate through the opening, so that the feedback element can be selectively located in the interference position or the non-interference position as the adjustment plate moves.

[0029] As an optional technical solution, the base plate also has a guide groove, and the adjusting plate bends into the guide groove to form a hook. The hook is movably inserted into the guide groove, so that the adjusting plate can move relative to the base plate along the guide groove.

[0030] As an optional technical solution, the adjustment plate and the support base are combined on the adjustment plate by embedding and injection.

[0031] Compared to existing technologies, this invention utilizes the linear feedback force generated by the actuator pressing against the extension arm of the sound-generating component, the linear elastic recovery force provided by the elastomer, and the sound generated by the extension arm detaching from the actuator and striking the impacted part. The sound-generating unit and the elastomer can jointly provide a uniform and audible linear feedback feel during the user's keycap pressing operation, thereby effectively improving the keycap pressing feel of the key structure.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Attached Figure Description

[0033] Figure 1 This is a partially exploded view of a button structure proposed according to an embodiment of the present invention.

[0034] Figure 2 for Figure 1 An assembly diagram of the base plate, thin film circuit board, elastomer, actuator and feedback unit.

[0035] Figure 3 for Figure 1 The key structure is shown in a partial cross-sectional view along section line AA after assembly.

[0036] Figure 4 for Figure 3 The key structure is shown in a cross-sectional view when the keycap is pressed.

[0037] Figure 5 This is a cross-sectional schematic diagram of a button structure proposed according to another embodiment of the present invention.

[0038] Figure 6 for Figure 5 The key structure is shown in a cross-sectional view when the keycap is pressed.

[0039] Figure 7 for Figure 5 A partially enlarged schematic diagram of the support base being installed on the adjustment plate. Detailed Implementation

[0040] To provide a better understanding of the purpose, structure, features and functions of this utility model, detailed descriptions are provided below with reference to the embodiments.

[0041] Please see Figure 1 , Figure 2 , Figure 3 as well as Figure 4 , Figure 1 This is a partially exploded view of a button structure according to an embodiment of the present invention. Figure 2 for Figure 1An assembly diagram of the base plate, thin-film circuit board, elastomer, actuator, and feedback unit. Figure 3 for Figure 1 The schematic diagram shows a partial cross-section of the button structure along section line AA after assembly. Figure 4 for Figure 3 The diagram shows a cross-sectional view of the keycap structure when it is pressed. (Example:) Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, the key structure 10 can be applied to common keyboards (such as notebook computer keyboards or folding keyboard devices) and is preferably a thin keyboard key with a longer key length (such as a multiplier key, but not limited thereto). The key structure 10 includes a keycap 12, a base plate 14, a support mechanism 16, a thin film circuit board 18, an elastomer 20, an actuator 22, and a feedback unit 24.

[0042] A base plate 14 is disposed below the keycap 12. A membrane circuit board 18 is disposed on the base plate 14 and has a trigger switch 19. A support mechanism 16 is movably connected between the keycap 12 and the base plate 14. In this embodiment, the support mechanism 16 is preferably a butterfly-type lifting mechanism (but not limited thereto; other common key lifting mechanisms, such as scissor mechanisms, can also be used) and is movably connected to the keycap 12 and the base plate 14 to support the keycap 12, allowing the keycap 12 to move up and down relative to the base plate 14 for the user to press and input. For example, the support mechanism 16 may include a first bracket 26 and a second bracket 28, which are movably connected to the keycap 12 and the base plate 14, and are pivotally connected to each other, allowing the keycap 12 to move up and down relative to the base plate 14. Furthermore, the actuator 22 is formed on the support mechanism 16 and extends toward the base plate 14. In this embodiment, the actuator 22 may be formed on the first bracket 26, by... Figure 3 It is understood that the actuator 22 can be formed on the inner side of the first bracket 26 and extends and protrudes from the first bracket 26 toward the base plate 14. For example, the actuator 22 can preferably be disposed on the inner side of the keycap end of the first bracket 26. The actuator 22 can preferably be a downwardly extending angular protrusion with a lower slope and an upper slope connected to the vertex. The vertex of the angular protrusion preferably faces the feedback unit 24 and preferably has a rounded corner and protrudes toward the inner side of the keycap 12.

[0043] Elastomer 20 (preferably a rubber elastomer, but not limited thereto) abuts against keycap 12 and base plate 14 to drive keycap 12 to move away from base plate 14. Elastomer 20 has an annular base 30, a bridging structure 32, and a central pillar 34. The annular base 30 extends upward to form an annular upright wall portion 36. The bridging structure 32 extends horizontally from the annular upright wall portion 36 to the central pillar 34 to support the central pillar 34 in a suspended position (e.g., ...). Figure 3 As shown, the elastomer 20 can flex and deform when the keycap 12 is pressed, causing the bridging structure 32 to flex and deform and the intermediate pillar 34 to press down against the membrane circuit board 18 to trigger the trigger switch 19 of the membrane circuit board 18, thereby executing the corresponding input function; on the other hand, when the external force is released, the elastomer 20 can use the elastic restoring force stored when it is pressed to help the keycap 12 return to its initial position, thereby producing the effect that the keycap 12 can automatically return to its original position so that the user can perform subsequent pressing operations.

[0044] Feedback unit 24 is configured corresponding to actuator 22 to provide linear tactile feedback when button structure 10 is pressed. For example... Figure 1 as well as Figure 2 As shown, the feedback unit 24 includes a feedback element 38 and a support base 40. The support base 40 has an upright guide groove 42. The feedback element 38 is disposed inside the support base 40 and has an extension arm 44. For example, the feedback element 38 can be a torsion spring, which includes a torsion spring body 39 and an extension arm 44 extending from one end of the torsion spring body 39. In other words, the extension arm 44 can serve as the movable part of the feedback element 38, and the torsion spring body 39 can be regarded as the stationary part of the feedback element 38. Thus, when the torsion spring body 39 of the feedback element 38 is disposed inside the support base 40, the extension arm 44 extends and inserts into the upright guide groove 42.

[0045] Through the above design, when the keycap 12 is pressed and moves toward the base plate 14 to drive the support mechanism 16 to move, the actuator 22 of the first bracket 26 presses down against the extension arm 44, causing the extension arm 44 to move downward along the vertical guide groove 42 and continuously abut against the actuator 22 to provide linear feedback elastic force to the keycap 12. Simultaneously, the keycap 12 also presses down on the elastic body 20, causing the intermediate pillar 34 to press against the thin-film circuit board 18 and causing the bridging structure 32 to flex and deform. During this process, such as Figure 4As shown, the annular upright wall 36 of the elastomer 20 ensures that the elastomer 20 will not buckle when the bridging structure 32 flexes. In other words, during the pressing of the keycap 12, the elastomer 20, through the flexing deformation of the bridging structure 32 and the design of the intermediate pillar 34 pressing against the thin film circuit board 18, provides a linear elastic restoring force to the keycap 12 without producing a tactile bump. In this way, through the linear feedback force generated by the continuous pressure of the actuator 22 of the first bracket 26 against the extension arm 44 of the feedback member 38 and the linear elastic restoring force provided by the elastomer 20, the feedback unit 24 and the elastomer 20 can jointly provide a uniform and linear feedback feel during the user's operation of pressing the keycap 12, thereby effectively improving the keycap pressing feel of the key structure 10.

[0046] It is worth mentioning that the pressing feel design adopted in this utility model is not limited to the above embodiments; it can also adopt a pressing sound feedback design. For example, please refer to... Figure 5 , Figure 6 as well as Figure 7 , Figure 5 This is a cross-sectional schematic diagram of a button structure according to another embodiment of the present invention. Figure 6 for Figure 5 A cross-sectional diagram of the key structure when the keycap is pressed. Figure 7 for Figure 5 The diagram shows a partially enlarged view of the support base located on the adjustment plate. Components in this embodiment that share the same number as those mentioned in the above embodiments represent components with the same or similar structures and functions. Their related descriptions can be deduced from the above embodiments and will not be repeated here. The key structure 100 can be applied to common keyboards (such as notebook computer keyboards or folding keyboard devices) and is preferably a thin keyboard key with a relatively long key length (such as multiplier keys, but not limited thereto). Figure 5 , Figure 6 by Figure 7 As shown, the key structure 100 includes a keycap 12, a base plate 14, a support mechanism 16, a membrane circuit board 18, an elastomer 20, an actuator 22, and a sound-generating unit 102.

[0047] The sound-generating unit 102 is provided corresponding to the actuator 22 to provide a pressing feel and sound feedback when the button structure 100 is pressed. The sound-generating unit 102 includes a sound-generating element 104 and a support base 106. The support base 106 has a striking portion 108. The sound-generating element 104 (preferably a torsion spring, the relevant description of which can be deduced from the above implementation) is disposed inside the support base 106 and has an extension arm 110. The extension arm 110 extends corresponding to the striking portion 108, and the striking portion 108 has a striking surface 108a and an inclined surface 108b. For example, the striking portion 108 can be a stand provided on the plate surface of the support base 106, which includes an upright portion extending upward from the plate surface of the support base 106 along the Z-axis direction and a horizontal portion extending from the top of the upright portion along the Y-axis direction, so that the striking portion 108 can have an inverted U-shaped or L-shaped shape. Figure 7 The shape is shown as an inverted U (but not limited to this), wherein the horizontal portion of the striking portion 108 is located at the upper end of the extension arm 110 and overlaps with the end (or free end) of the extension arm 110 in the Z-axis direction. The striking surface 108a is the wall surface of the striking portion 108 facing the extension arm 110 in the Z-axis direction (e.g., the lower surface of the horizontal portion) to serve as the striking surface of the extension arm 110. The inclined surface 108b is provided on the side of the extension arm 110 relative to the extension direction of the extension arm 110 (e.g., the X-axis direction) to guide the movement of the extension arm 110 in the Z-axis direction. For example, the inclined surface 108b is the wall surface of the striking portion 108 facing the extension arm 110 in the Y-axis direction, such as the surface of the upright portion adjacent to the striking surface 108a, and the inclined surface 108b is preferably inclined from top to bottom towards the extension arm 110, that is, inclined towards the center of the keycap 12.

[0048] like Figure 5 as well as Figure 6 As shown, when the keycap 12 moves toward the base plate 14 to move the support mechanism 16, the actuator 22 presses down against the extension arm 110, causing the extension arm 110 to break free from the pressure of the actuator 22 and rebound upward to strike the impact surface 108a of the impact portion 108, thus producing a sound. Specifically, when the keycap 12 is pressed, the keycap 12 drives the support mechanism 16 to move downward and compress the elastic body 20. As the support mechanism 16 moves downward, the actuator 22 interferes with the extension arm 110. The actuator 22 moves toward the support base 106 and presses down on the extension arm 110, causing the extension arm 110 to move downward along the inclined surface 108b of the impact portion 108. As the keycap 12 continues to move downwards, triggering the circuit membrane 18's trigger switch 19, the extension arm 110 moves past the actuator 22. This releases the extension arm 110, causing it to rebound upwards towards the impact surface 108a of the impact portion 108, thus striking the impact surface 108a and producing a sound. Afterwards, when the keycap 12 is released (i.e., when the keycap 12 is no longer pressed), the elastic restoring force of the elastic body 20 allows the keycap 12 to move relative to the base plate 14, causing the support mechanism 16 to... Figure 6The pressed position shown moves upward and returns to its original position. Figure 5 The unpressed position is shown. In this way, the linear feedback force generated by the actuator 22 pressing against the extension arm 110 of the sound-emitting element 104, the linear elastic recovery force provided by the elastomer 20, and the sound generated by the extension arm 110 detaching from the actuator 22 and striking the impacted part 108, together the sound-emitting unit 102 and the elastomer 20 can provide a uniform and audible linear feedback feel during the user's operation of pressing the keycap 12, thereby effectively improving the keycap pressing feel of the key structure 100.

[0049] In practical applications, this utility model can further adopt a movable switching design for the support base. It should be noted that the movable switching design for the support base used in this embodiment can also be applied to other embodiments of this utility model (such as...). Figures 1 to 4 The embodiments shown herein can be described by analogy with the following examples, and will not be repeated here. For example, such as Figure 5 , Figure 6 as well as Figure 7 As shown, the sound-generating unit 102 may further include an adjustment plate 112, which is movably disposed below the base plate 14 (for example, by providing a guide groove on the base plate 14 and engaging a hook of the adjustment plate 112 (the adjustment plate 112 bends towards the aforementioned guide groove to form the hook, and the hook is movably inserted into the guide groove), so that the adjustment plate 112 can move relative to the base plate 14 (along the guide groove), but this is not a limitation). A support base 106 is disposed on the adjustment plate 112 (preferably, the support base 106 and the adjustment plate 112 are joined by insert molding, or the support base 106 is joined to the adjustment plate 112 by insert molding, but this is not a limitation; the support base 106 can also be joined to the adjustment plate 112 in any suitable manner, such as locking, bonding, or engaging) protruding from the opening 15 of the base plate 14 (e.g., Figure 5 as well as Figure 6 As shown, the support base 106 can move relative to the base plate 14, so that the sound-emitting element 104 can be selectively located in an interference position or a non-interference position. When the sound-emitting element 104 is in the interference position, the extension arm 110 is pressed by the actuator 22 and produces a sound. When the sound-emitting element 104 is in the non-interference position, the extension arm 110 is not pressed by the actuator 22 and does not produce a sound, thereby changing the pressing feel and sound effect of the button structure 100.

[0050] In other words, when the support 106 moves relative to the base plate 14 within the opening 15 toward the actuator 22 (e.g., toward the switching direction D1), the sound-emitting element 104 moves along with the support 106 and is positioned on the movement path of the actuator 22, i.e., the extension arm 110 extends through the movement path of the actuator 22, or the extension arm 110 partially overlaps with the actuator 22 in the Z-axis direction (e.g., ...). Figure 5 As shown), in this state, the sound-emitting element 104 is in the interference position, thereby, when the keycap 12 is pressed, the keycap 12 moves toward the base plate 14 to drive the support mechanism 16 to move, and the actuator 22 simultaneously presses down against the extension arm 110, thereby causing the extension arm 110 to disengage from the pressure of the actuator 22 (as shown). Figure 6 (As shown) it bounces upward and impacts the impact surface 108a of the impacted part 108 to produce a sound.

[0051] On the other hand, when the support base 106 moves away from the actuator 22 relative to the base plate 14 within the opening 15 (e.g., moving towards the switching direction D2), the sound-emitting element 104 moves with the support base 106 and is not located on the movement path of the actuator 22, that is, the extension arm 110 is away from the movement path of the actuator 22, or the extension arm 110 and the actuator 22 do not overlap in the Z-axis direction. In this state, the sound-emitting element 104 is in a non-interference position. Thus, when the keycap 12 is pressed to drive the support mechanism 16 and the actuator 22 to move downward and compress the elastomer 20 to trigger the trigger switch 19 of the membrane circuit board 18, since the extension arm 110 is not on the movement path of the actuator 22, the actuator 22 and the extension arm 110 will not interfere with each other, so that the key structure 100 provides a silent linear feedback feel. That is, in this state, the key structure 100 makes the pressing force required for the keycap 12 to drive the actuator 22 through the sound-emitting element 104 relatively small, and no sound is emitted. In this way, through the simple configuration of the adjustment plate connecting the support of the sound unit and being movably set under the base plate, the button structure of this utility model can be switched and adjusted according to the different requirements of different users for the pressing feel, thereby greatly improving the flexibility and ease of use of the button structure.

[0052] In summary, the linear feedback force generated by the actuator pressing the extension arm of the sound-generating element, the linear elastic restoring force provided by the elastomer, and the sound generated by the extension arm detaching from the actuator and striking the impacted part, together with the sound-generating unit and the elastomer, can provide a uniform and audible linear feedback feel during the user's keycap pressing operation, thereby effectively improving the keycap pressing feel of the key structure.

[0053] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A key structure characterized by comprising: The key structure comprises: a keycap; a bottom plate arranged below the keycap; a support mechanism movably connected between the keycap and the bottom plate, so that the keycap can move up and down relative to the bottom plate; a thin film circuit board arranged on the bottom plate and having a trigger switch; an elastic body abutting between the keycap and the bottom plate to drive the keycap to move away from the bottom plate, the elastic body having a ring-shaped base, a bridging structure and an intermediate column, the ring-shaped base extending upward to form a ring-shaped upright wall, the bridging structure extending horizontally from the ring-shaped upright wall to connect to the intermediate column to support the intermediate column suspended, so that the intermediate column triggers the trigger switch downward when the keycap is pressed; an actuator formed on the support mechanism and extending toward the bottom plate; and a sound generating unit corresponding to the actuator, the sound generating unit comprising a sound generating member and a support seat, the support seat having a receiving portion, the sound generating member being arranged on the support seat and having an extension arm extending corresponding to the receiving portion; When the keycap is pressed, the keycap presses the elastic body, so that the intermediate column presses against the thin film circuit board and the bridging structure is deformed to provide a linear feedback feeling, and the keycap drives the support mechanism to move to make the actuator press against the extension arm downward, so that the extension arm rebounds upward to hit the receiving portion to produce a sound when the keycap is pressed. The support mechanism comprises a first support and a second support movably connected to the keycap and the bottom plate and pivotally connected to each other, and the actuator is formed on the first support.

2. The key structure according to claim 1, wherein The support seat can move relative to the base, so that the sound generating member is selectively located in an interference position or a non-interference position; when the sound generating member is located in the interference position, the extension arm is pressed by the actuator to produce the sound; when the sound generating member is located in the non-interference position, the extension arm is not pressed by the actuator to not produce the sound.

3. The key structure of claim 1, wherein The bottom plate has an opening, and the sound generating unit further comprises an adjusting plate movably arranged below the bottom plate and the support seat arranged on the adjusting plate to protrude from the opening to the bottom plate, so that the sound generating member can be selectively located in the interference position or the non-interference position by moving the adjusting plate.

4. The key structure according to claim 3, wherein The key structure comprises:

5. A key structure characterized by comprising: a keycap; a bottom plate arranged below the keycap; a bottom plate arranged below the keycap; a support mechanism movably connected between a keycap and a bottom plate, so that the keycap can move up and down relative to the bottom plate; A thin film circuit board is arranged on the bottom plate and has a trigger switch; an elastic body abutting between the keycap and the bottom plate to drive a keycap to move away from the bottom plate, the elastic body having a ring-shaped base, the bridging structure and the intermediate column, the ring-shaped base extending upward to form a ring-shaped upright wall, the bridg ​ ​ A feedback unit is arranged corresponding to the actuator, and the feedback unit comprises a feedback member and a support base having a vertical guide slot, the feedback member is arranged on the support base and has an extension arm inserted into the vertical guide slot; When the keycap is pressed, the keycap presses the elastic body, the intermediate column presses against the FPCB and makes the bridge structure deform, and the keycap drives the support mechanism to move so that the actuator presses against the extension arm, the extension arm moves downward along the vertical guide slot to provide linear feedback feeling together with the elastic body.

6. The key structure according to claim 5, wherein The support mechanism comprises a first support and a second support, the first support and the second support are movably connected to the keycap and the bottom plate and are pivotally connected to each other, and the actuator is formed on the first support.

7. The key structure according to claim 5, wherein The support base is movable relative to the bottom plate, so that the feedback member is selectively located in an interference position or a non-interference position; when the feedback member is located in the interference position, the extension arm is pressed by the actuator; when the feedback member is located in the non-interference position, the extension arm is not pressed by the actuator.

8. The key structure according to claim 7, wherein The bottom plate has an opening, and the feedback unit further comprises an adjusting plate movably arranged below the bottom plate, and the support base is arranged on the adjusting plate to protrude from the opening of the bottom plate, so that the feedback member can be selectively located in the interference position or the non-interference position by moving the adjusting plate.

9. The key structure according to claim 4 or 8, wherein The bottom plate also has a guide slot, the adjusting plate is bent to form a hook in the guide slot, the hook is movably inserted into the guide slot, so that the adjusting plate can move relative to the bottom plate along the guide slot.

10. The key structure according to claim 4 or 8, wherein The adjusting plate and the support base are combined on the adjusting plate in a buried injection manner.

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