CN114551138B

CN114551138B - Key structure

Info

Publication number: CN114551138B
Application number: CN202011337622.5A
Authority: CN
Inventors: 吴明翰; 杨哲玮; 陈宜玮; 刘建宏; 蔡磊龙
Original assignee: Primax Electronics Ltd
Current assignee: Primax Electronics Ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2023-12-29
Anticipated expiration: 2040-11-25
Also published as: CN114551138A

Abstract

The invention provides a key structure. The key structure comprises a key cap, a supporting plate and wing-type supporting elements. When the key cap is pressed by external force, the first frame and the second frame in the wing type supporting element can be mutually pushed by utilizing the convex rib and the circular shaft, so that the first frame and the second frame swing relative to the supporting plate.

Description

Key structure

Technical Field

The present disclosure relates to input devices, and particularly to a key structure.

Background

In the modern society, the use of electronic products has become an indispensable part of life, such as food, clothes, lives, rows, nurturing, and happiness, each of which is related to electronic products. In general, electronic products are equipped with a keyboard, and in order to make the keyboard lighter and thinner and reduce the manufacturing cost, manufacturers often try to simplify the design of the supporting elements of the keys so as to achieve the effect of lightening and thinning the keyboard.

However, the simplified design of the supporting element can reduce the manufacturing cost and simplify the assembly of the key, but at the same time, the keycap of the key can not stably rise or fall, so that a user can generate poor pressing hand feeling when pressing the key, therefore, how to provide a key structure which is easy to assemble and has good pressing hand feeling is a technical problem to be solved by the invention.

Disclosure of Invention

The invention mainly aims to provide a key structure which is easy to assemble and has good pressing hand feeling.

In order to achieve the above object, the present invention provides a key structure, comprising: a key cap; a support plate; the wing type support element is used for connecting the keycap and the support plate, so that the keycap can move up and down relative to the support plate, and comprises: the first frame is provided with a first end and a second end which are opposite, and the first end is provided with a first convex rib and a first round shaft; the second frame is provided with a third end and a fourth end which are opposite, and the third end is provided with a second convex rib corresponding to the first round shaft and a second round shaft corresponding to the first convex rib; the second end and the fourth end are slidably connected to the keycap, the first end is adjacent to the third end and is respectively pivoted on the supporting plate, the first circular shaft and the second circular shaft are respectively abutted against the second convex rib and the first convex rib, and when the keycap is pressed by external force, the first convex rib and the second convex rib simultaneously push against the second circular shaft and the first circular shaft, so that the first frame and the second frame swing relative to the supporting plate.

In the preferred embodiment, the first rib and the second rib have a first concave portion and a second concave portion, respectively, when the key cap is not pressed by an external force, the first circular shaft and the second circular shaft are respectively engaged with the second concave portion and the first concave portion, and when the key cap is pressed by the external force and reaches the lowest stroke, the first circular shaft and the second circular shaft are simultaneously separated from the second concave portion and the first concave portion.

In the preferred embodiment, the lower surface of the key cap has two opposite limiting ribs, and each limiting rib has a first limiting inclined plane.

In the preferred embodiment, the second end and the fourth end are respectively provided with a second limiting inclined plane corresponding to the first limiting inclined plane, and when the keycap is not pressed by external force, the first limiting inclined plane and the second limiting inclined plane are abutted against each other so as to avoid shaking of the keycap in the horizontal direction.

In the preferred embodiment, the support plate has two connecting structures extending upward and opposite to each other, and each connecting structure has a first pivot hole and a second pivot hole adjacent to each other.

In the preferred embodiment, the inner edge of the first end has two opposite first pivots, the inner edge of the third end has two opposite second pivots, each first pivot is disposed through the first pivot hole, and each second pivot is disposed through the second pivot hole.

In the preferred embodiment, the wing-type supporting element further includes a key seat, the first end and the third end are respectively pivoted to the key seat, and the key seat is fixedly disposed on the supporting plate.

In the preferred embodiment, the two opposite sides of the key seat are respectively provided with a first pivot hole and a second pivot hole which are adjacent.

In the preferred embodiment, the key seat has two engaging grooves on two opposite sides of the key seat, which are not provided with the first pivot hole and the second pivot hole, respectively, and each engaging groove has an engaging post therein.

In the preferred embodiment, the supporting plate has a plurality of hook structures extending upward and corresponding to the engaging grooves, and each hook structure is disposed through each engaging groove and engaged with the engaging column body to fix the key base on the supporting plate.

In the preferred embodiment, the key seat has a relief groove on the other two opposite sides not provided with the first pivot hole and the second pivot hole, each relief groove corresponds to each limit rib, and when the key cap is pressed by external force and reaches the lowest stroke, each limit rib enters each relief groove, so as to avoid mutual interference between the two limit ribs and the key seat.

In the preferred embodiment, the opposite side surfaces of the first frame are respectively provided with a first sliding groove, and the opposite side surfaces of the second frame are respectively provided with a second sliding groove.

In the preferred embodiment, the first link lever is further provided with a cross bar and two supporting rods which are positioned at two ends of the cross bar and perpendicular to the cross bar, and the tail end of each supporting rod is provided with a bending section parallel to the cross bar.

In the preferred embodiment, the cross bar is pivoted on the lower surface of the keycap, and each bending section is inserted into the first chute or the second chute.

In the preferred embodiment, the lower surface of the keycap is provided with a fastening part, and the cross bar is arranged on the fastening part in a penetrating way, so that the cross bar can rotate relative to the keycap.

In the preferred embodiment, the first link lever is provided with a cross bar and two supporting rods perpendicular to the cross bar, and the two supporting rods are respectively arranged in the first chute and the second chute in a penetrating way.

In the preferred embodiment, the lower surface of the key cap has a first movable hook and a second movable hook disposed opposite to each other, the second end is slidably engaged with the first movable hook, and the fourth end is slidably engaged with the second movable hook.

The key structure provided by the invention has the beneficial effects that the key structure can prevent the key cap from shaking in the horizontal direction by mutually abutting the limiting convex rib arranged below the key cap and the limiting inclined surface arranged on the wing-type supporting element, so that the stability of the key cap during pressing can be improved. On the other hand, the convex ribs and the circular shafts arranged in the wing-shaped supporting element are mutually pushed and driven, so that the two frames of the wing-shaped supporting element can maintain the same swinging angle when swinging, the keycap can stably rise and fall without deflection, and further, a good pressing hand feeling is provided for a user.

Drawings

FIG. 1 is a schematic perspective view of a first embodiment of a key structure according to the present invention;

FIG. 2A is an exploded perspective view of a first embodiment of a key structure according to the present invention;

FIG. 2B is an exploded perspective view of a key structure according to another embodiment of the present invention;

FIG. 2C is an enlarged view of area A in FIG. 2A;

FIG. 3A is an exploded perspective view of a first embodiment of the wing support element of the present invention;

FIG. 3B is a top view of a first embodiment of the wing support element of the present invention;

FIG. 4 is a schematic perspective view of the installation of a first embodiment of the wing support element of the present invention;

FIG. 5 is a cross-sectional view of a first embodiment of a key structure according to the present invention;

fig. 6 and 7 are schematic diagrams illustrating the operation of the first embodiment of the key structure of the present invention;

FIG. 8 is a schematic perspective view of a second embodiment of a key structure according to the present invention;

FIG. 9 is a schematic perspective view of a third embodiment of a key structure according to the present invention;

fig. 10A is a schematic perspective view of another embodiment of the support plate of the present invention; and

fig. 10B is a top view of a second embodiment of the wing support element of the present invention installed.

The reference numerals are as follows:

region A

F external force

1. Key structure

10. Key cap

11. Upper surface of

12. Lower surface of

121. First movable hook

122. Second movable hook

123. 124 fastener

125. Spacing rib

1251. First limiting inclined plane

20. Wing type supporting element

21. First frame

211. First end

2111. First convex rib

21111. First concave part

2112. First round shaft

212. Second end

2121. Second limiting inclined plane

213. First pivot

214. First chute

22. Second frame

221. Third end

2211. Second convex rib

22111. Second concave part

2212. Second round shaft

222. Fourth end

2221. Second limiting inclined plane

223. Second pivot

224. Second chute

23. Key seat

231. Clamping groove

2311. Clamping column

232. Yield groove

233. A first pivot hole

234. Second pivot hole

30. Supporting plate

31. Clamping hook structure

32. Connection structure

321. A first pivot hole

322. Second pivot hole

40. 50 first linkage rod

41. 51 cross bar

42. 52 pole

421. 521 bending section

60. Film circuit board

61. An opening

70. Second linkage rod

71. Cross bar

72. Support rod

Detailed Description

The advantages and features of the present invention and the manner in which the same are accomplished will be more readily understood by reference to the following detailed description of exemplary embodiments taken in conjunction with the accompanying drawings. This invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, such embodiments are provided to enable those skilled in the art to more fully and fully convey the scope of the invention.

First, referring to fig. 1, fig. 2A and fig. 2B, fig. 1 is a schematic perspective view of a first embodiment of a key structure according to the present invention; FIG. 2A is an exploded perspective view of a first embodiment of a key structure according to the present invention; FIG. 2B is an exploded perspective view of a key structure according to another embodiment of the present invention; fig. 2C is an enlarged view of the area a in fig. 2A. The key structure 1 includes: the key cap 10, the wing type supporting element 20, the supporting plate 30, the first linkage rods 40 and 50 and the thin film circuit board 60.

The key cap 10 has an upper surface 11 and a lower surface 12 opposite to each other, wherein the lower surface 12 has a first movable hook 121, a second movable hook 122 opposite to each other, a plurality of fastening portions 123, 124, and a plurality of limiting ribs 125 opposite to each other. In fig. 2C, a first limiting inclined plane 1251 is disposed at an end of each limiting rib 125 away from the lower surface of the key cap 10, and the first limiting inclined planes 1251 of two opposite limiting ribs 125 are disposed in opposite directions. In the present embodiment, the key structure 1 is an elongated key with two wing-type supporting elements 20, and each wing-type supporting element 20 has four corresponding limiting ribs 125, and a first movable hook 121 and a second movable hook 122 disposed at the periphery of the limiting ribs 125. On the other hand, the plurality of fastening portions 123 are provided along the skirt structure of the key cap 10; the plurality of fastening portions 124 are disposed in a central area of the lower surface of the key cap 10.

The supporting plate 30 has two sets of four hook structures 31 extending upward and disposed opposite to each other. The thin film circuit board 60 is disposed on the supporting plate 30, and the thin film circuit board 60 has two openings 61 corresponding to the hook structures 31, so that the hook structures 31 can penetrate through the openings 61 to be combined with the wing-type supporting element 20. The wing type supporting member 20 is used for connecting the key cap 10 with the supporting plate 30, so that the key cap 10 can move up and down relative to the supporting plate 30. In addition, an elastomer (not shown) may be disposed on the thin film circuit board 60, and the elastic restoring force may be provided to the key cap 10 by using the elastomer.

With continued reference to fig. 2A and 2B, the first linking rods 40 and 50 each have a cross bar 41 and 51, two supporting rods 42 and 52 located at two ends of the cross bar 41 and 51 and perpendicular to the cross bar 41 and 51, and each end of the supporting rods 42 and 52 has a bending section 421 and 521 parallel to the cross bar 41 and 51. In the present embodiment, the cross bar 41 of the first link 40 located outside the wing-type supporting element 20 is inserted into the fastening portion 123; the cross bar 51 of the first linking bar 50 between the two wing-type supporting elements 20 is inserted into the fastening portion 124, so that the cross bars 41 and 51 are pivoted on the lower surface of the keycap 10 and can rotate relative to the keycap 10. On the other hand, the bending sections 421 and 521 at the ends of the struts 42 and 52 are slidably disposed in the wing-type supporting element 20, respectively, so that the first linking rods 40 and 50 can link with the wing-type supporting element 20 to help the key cap 10 stably rise and fall. In the embodiment, although only the implementation in which the key structure 1 includes two first links 40 and two first links 50 is provided, in practical application, the number of the first links 40 and 50 may be adjusted according to the width or structural strength requirement of the key structure, and in some possible implementations, only one first link 40 or one first link 50 may be provided, or no first link may be provided, which is not limited to the implementation provided in the embodiment.

Referring to fig. 3A and 3B, fig. 3A is an exploded perspective view of a first embodiment of a wing-type supporting element according to the present invention; fig. 3B is a top view of a first embodiment of the wing support element of the present invention. In this embodiment, the wing type supporting element 20 includes: the first frame 21, the second frame 22 and the key seat 23, and the first frame 21 and the second frame 22 are substantially U-shaped.

The first frame 21 has opposite first and second ends 211 and 212. The second end 212 is slidably engaged in the first movable hook 121 (as shown in fig. 2A). The first end 211 has a first rib 2111 and a first circular shaft 2112 on two sides, and the upper surface of the first rib 2111 has a first concave portion 21111, and the inner edge of the first end 211 has two first pivots 213 disposed opposite to each other. In addition, the first frame 21 has a first sliding groove 214 on two opposite side surfaces near the first end 211, and the outer first sliding groove 214 is configured for the bending section 421 (as shown in fig. 2A) of the first linkage rod 40 to pass through; the inner first sliding groove 214 is configured for the bending section 521 (as shown in fig. 2A) of the first linkage rod 50 to pass therethrough. On the other hand, the second end 212 has a second limiting ramp 2121 corresponding to the first limiting ramp 1251.

The second frame 22 has a third end 221 and a fourth end 222 opposite to each other. The fourth end 222 is slidably engaged with the second movable hook 122 (as shown in fig. 2A). The third end 221 has a second rib 2211 and a second circular shaft 2212 on two sides, and the upper surface of the second rib 2211 has a second concave 22111, and the inner edge of the third end 221 has two second pivots 223 disposed opposite to each other. In addition, the second frame 22 has a second sliding groove 224 on two opposite side surfaces near the third end 221, and the second sliding groove 224 on the outer side is configured for the bending section 421 (as shown in fig. 2A) of the first linkage rod 40 to penetrate therethrough; the second sliding groove 224 on the inner side can be penetrated by the bending section 521 (as shown in fig. 2A) of the first linkage rod 50. On the other hand, the fourth end 222 also has a second limiting slope 2221 corresponding to the first limiting slope 1251. In the present embodiment, the second rib 2211 of the third end 221 corresponds to the first circular shaft 2112 of the first end 211; and the second circular shaft 2212 corresponds to the first rib 2111 of the first end 211.

Two opposite sides of the key seat 23 are respectively provided with a first pivot hole 233 and a second pivot hole 234 which are adjacent to each other; the key seat 23 has two engaging grooves 231 and two yielding grooves 232 corresponding to the limiting ribs 125 on the other two opposite sides not provided with the first pivot hole 233 and the second pivot hole 234, and each engaging groove 231 has one engaging post 2311. Wherein, the first pivot 213 of the first end 211 of the first frame 21 is disposed through the first pivot hole 233 of the key seat 23; the second pivot 223 of the third end 221 of the second frame 22 is disposed through the second pivot hole 234 of the key seat 23, so that the first frame 21 and the second frame 22 can swing relative to the key seat 23 like wings.

Referring to fig. 2A and 4, fig. 4 is a schematic perspective view illustrating the installation of a first embodiment of the wing-type supporting element according to the present invention. In fig. 4, the four hook structures 31 on the supporting plate 30 are respectively disposed in the engaging grooves 231 from bottom to top, and the inner sides of the hooks of the hook structures 31 are engaged with the engaging columns 2311, so as to fix the key seat 23 on the supporting plate 30.

Referring to fig. 5, fig. 5 is a cross-sectional view of a first embodiment of a key structure according to the present invention. In fig. 5, when the key cap 10 is not pressed by an external force, the first limiting inclined surface 1251 of the limiting rib 125 on the lower surface of the key cap 10 abuts against the second end 212 of the first frame 21 and the second limiting inclined surfaces 2121 and 2221 of the fourth end 222 of the second frame 22, so that the shaking of the key cap 10 in the horizontal direction can be avoided, and the stability of the key cap 10 during pressing can be improved. In the embodiment, although only the implementation of four limiting ribs 125 are provided above each wing-type supporting element 20 is provided, in practical application, only two opposite limiting ribs 125 (the first limiting inclined planes 1251 are also arranged in opposite directions) may be provided, so as to achieve the effect of preventing the keycap 10 from shaking.

Referring to fig. 2A, fig. 3A, fig. 6 and fig. 7 are schematic diagrams illustrating the operation of the first embodiment of the key structure of the present invention. When the key cap 10 is not pressed by an external force (as shown in fig. 6 (i)), the second circular shaft 2212 of the second frame 22 is engaged with the first recess 21111 of the first rib 2111 of the first frame 21; the first circular shaft 2112 of the first frame 21 engages with the second recess 22111 of the second rib 2211 of the second frame 22. On the other hand, the bending sections 421 of the two first connecting rods 40 are slidably disposed in the first sliding groove 214 on the outer side of the first frame 21 and the second sliding groove 224 on the outer side of the second frame 22, respectively.

When the upper surface 11 of the key cap 10 is pressed by the external force F (as shown in fig. 6 (ii)), the first ribs 2111 and the second ribs 2211 (as shown in fig. 3A) simultaneously push the second circular shaft 2212 and the first circular shaft 2112, so that the first frame 21 and the second frame 22 swing relative to the key pad 23. When the key cap 10 reaches the lowest stroke, the first circular shaft 2112 (as shown in fig. 3A) and the second circular shaft 2212 are simultaneously disengaged from the second recess 22111 and the first recess 21111; on the other hand, the bending section 421 passing through the first chute 214 and the second chute 224 slides from the center of the chute to the side close to the first end 211 and the third end 221. Since the first frame 21 and the second frame 22 can push the circular shaft through the ribs and can drive each other, the first frame 21 and the second frame 22 can maintain the same swing angle when swinging, so that the keycap 10 can stably rise and fall. In other words, the user can press the key cap 10 at any position on the upper surface 11 of the key cap 10, and the key cap 10 will not be tilted when it is lowered, so that a good pressing feeling can be provided for the user.

With continued reference to fig. 7, when the key cap 10 reaches the lowest stroke, each of the limiting ribs 125 enters the corresponding recess 232, so as to avoid interference between the limiting rib 125 and the key seat 23.

Referring to fig. 8, fig. 8 is a schematic perspective view of a second embodiment of a key structure according to the present invention. In the second embodiment, the functions of the elements of the key structure 1 are the same as those of the first embodiment of fig. 2A, and the detailed description thereof will be omitted. However, the difference is that the key structure 1 is a general key, only one wing-type supporting element 20 is provided, and the bending sections 421 of the two first connecting rods 40 are slidably disposed in the first sliding grooves 214 and the second sliding grooves 224 (as shown in fig. 3A) on both sides of the wing-type supporting element 20, respectively. In the embodiment, only the implementation of the key structure 1 having two first links 40 is provided, but in practical application, only one first link 40 may be provided on the same side of the first frame 21 or the second frame 22, or no link may be provided, which is not limited to the implementation provided in the embodiment.

Referring to fig. 9, fig. 9 is a schematic perspective view of a third embodiment of a key structure according to the present invention. In the third embodiment, the functions of the elements of the key structure 1 are the same as those of the second embodiment of fig. 8, and the detailed description thereof will be omitted. However, the difference is that the key structure 1 is further provided with a second link 70. The second linkage rod 70 has a cross rod 71 and two supporting rods 72 perpendicular to the cross rod 71 and positioned at two ends of the cross rod 71, wherein the two supporting rods 72 are slidably disposed in a first sliding groove 214 and a second sliding groove 224 (as shown in fig. 3A) positioned on the same side of the wing type supporting element 20, respectively. In the present embodiment, the second link 70 is used to increase the structural strength of the wing-type supporting element 20, so as to make the swinging motion of the first frame 21 and the second frame 22 more stable.

Referring to fig. 10A and 10B, fig. 10A is a schematic perspective view of another embodiment of a support plate according to the present invention; fig. 10B is a top view of a second embodiment of the wing support element of the present invention installed. The support plate 30 has two connecting structures 32 extending upward and opposite to each other, and the two connecting structures 32 have adjacent first and second pivot holes 321 and 322, respectively. In the present embodiment, the wing support element 20 has only the first frame 21 and the second frame 22, and no design of the key seat 23. On the other hand, the first pivot shaft 213 of the first end 211 of the first frame 21 is inserted into the first pivot hole 321 of the connecting structure 32 of the support plate 30; the second pivot 223 of the third end 221 of the second frame 22 is disposed through the second pivot hole 322 of the connecting structure 32 of the supporting plate 30, so that the first frame 21 and the second frame 22 can swing relative to the supporting plate 30 like wings.

Compared with the prior art, the key structure provided by the invention can prevent the key cap from shaking in the horizontal direction by mutually abutting the limiting convex rib arranged under the key cap and the limiting inclined surface arranged on the wing-type supporting element, so that the stability of the key cap during pressing can be improved. On the other hand, the convex ribs and the circular shafts arranged in the wing-type supporting element are mutually pushed and driven, so that the two frames of the wing-type supporting element can maintain the same swinging angle when swinging, and the keycap can stably rise and fall without deflection, thereby providing good pressing hand feeling for users; therefore, the invention is an invention with great industrial value.

The present invention is modified as desired by those skilled in the art, but is not to be construed as limited by the appended claims.

Claims

1. A key structure, comprising:

a key cap;

a support plate;

at least one wing type supporting element for connecting the key cap and the supporting plate, so that the key cap can move up and down relative to the supporting plate, comprising:

the first frame is provided with a first end and a second end which are opposite to each other, and the first end is provided with a first convex rib and a first round shaft;

the second frame is provided with a third end and a fourth end which are opposite to each other, and the third end is provided with a second convex rib corresponding to the first round shaft and a second round shaft corresponding to the first convex rib;

the second end and the fourth end are slidably connected to the keycap, the first end is adjacent to the third end and is respectively pivoted on the supporting plate, the first circular shaft and the second circular shaft are respectively abutted against the second convex rib and the first convex rib, and when the keycap is pressed by external force, the first convex rib and the second convex rib simultaneously push the second circular shaft and the first circular shaft, so that the first frame and the second frame swing relative to the supporting plate;

wherein, the two opposite side surfaces of the first frame are respectively provided with a first chute, and the two opposite side surfaces of the second frame are respectively provided with a second chute.

2. The key structure of claim 1, wherein the first rib and the second rib have a first concave portion and a second concave portion, respectively, and the first circular shaft and the second circular shaft are engaged with the second concave portion and the first concave portion, respectively, when the key cap is not pressed by an external force, and when the key cap is pressed by an external force and reaches a minimum stroke, the first circular shaft and the second circular shaft are simultaneously separated from the second concave portion and the first concave portion.

3. The key structure of claim 1, wherein the lower surface of the key cap has at least two limiting ribs disposed opposite to each other, each of the limiting ribs having a first limiting slope.

4. The key structure of claim 3, wherein the second end and the fourth end have a second limiting slope corresponding to the first limiting slope, respectively, and when the key cap is not pressed by an external force, the first limiting slope and the second limiting slope are abutted against each other, so as to avoid shaking of the key cap in a horizontal direction.

5. The key structure of claim 1, wherein the supporting plate has two connecting structures extending upward and opposite to each other, each of the connecting structures has a first pivot hole and a second pivot hole adjacent to each other.

6. The key structure of claim 5, wherein the inner edge of the first end has two opposite first pivots, the inner edge of the third end has two opposite second pivots, each of the first pivots is disposed through the first pivot hole, and each of the second pivots is disposed through the second pivot hole.

7. The key structure of claim 3, wherein the at least one wing supporting element further comprises a key base, the first end and the third end are respectively pivoted to the key base, and the key base is fixedly arranged on the supporting plate.

8. The key structure of claim 7, wherein the key base has a first pivot hole and a second pivot hole adjacent to each other on two opposite sides thereof.

9. The key structure of claim 8, wherein the inner edge of the first end has two opposite first pivots, the inner edge of the third end has two opposite second pivots, each of the first pivots is disposed through the first pivot hole, and each of the second pivots is disposed through the second pivot hole.

10. The key structure of claim 8, wherein the key base has at least two engaging grooves on two opposite sides thereof, respectively, where the first pivot hole and the second pivot hole are not provided, and each engaging groove has an engaging post therein.

11. The key structure of claim 10, wherein the supporting plate has a plurality of hook structures extending upward and corresponding to the engaging grooves, and each hook structure is disposed through each engaging groove and engages with the engaging post to fix the key base on the supporting plate.

12. The key structure of claim 8, wherein the key base has at least one relief groove on two opposite sides thereof, respectively, where the first pivot hole and the second pivot hole are not provided, each relief groove corresponds to each limit rib, and when the key cap is pressed by an external force and reaches a minimum stroke, each limit rib enters each relief groove, so as to avoid the interference between the at least two limit ribs and the key base.

13. The key structure of claim 1, further comprising at least one first link having a cross bar and two struts perpendicular to the cross bar at both ends of the cross bar, each of the struts having a bent section parallel to the cross bar at an end thereof.

14. The key structure of claim 13, wherein the cross bar is pivoted to the lower surface of the key cap, and each of the bending sections is disposed through the first sliding slot or the second sliding slot.

15. The key structure of claim 14, wherein the bottom surface of the key cap has at least one fastening portion, and the cross bar is disposed through the at least one fastening portion, so that the cross bar can rotate relative to the key cap.

16. The key structure of claim 1, further comprising at least one second link rod having a cross rod and two supporting rods perpendicular to the cross rod and disposed at two ends of the cross rod, wherein the two supporting rods are respectively disposed in the first chute and the second chute.

17. The key structure of claim 1, wherein the lower surface of the key cap has a first movable hook and a second movable hook disposed opposite to each other, the second end is slidably engaged with the first movable hook, and the fourth end is slidably engaged with the second movable hook.