TWI849745B - Keyboard device - Google Patents

Abstract

The present invention discloses a keyboard device including a least one key structure, the least one key structure includes a key cap, a first bottom plate, a second bottom plate and a connecting component. The first bottom plate is disposed under the key cap. The first bottom plate includes a first hook extending toward the key cap. The second bottom plate is disposed under the first bottom plate. The second bottom plate includes a second hook extending toward the key cap and passing through the first bottom plate. The connection component is disposed between the key cap and the first bottom plate. The key cap moves up and down relative to the first bottom plate through the connecting component. The connection component includes a first pivot portion and a second pivot portion. The first pivot portion is pivotally connected to the first hook of the first bottom plate. The second pivot portion is pivotally connected to the second hook of the second bottom plate. Due to external force, the second bottom plate moves from a first position to a second position relative to the first bottom plate, and drives the second hook to disengage from the second pivot portion pivotally connected to the connecting component during the movement of the second base plate.

Description

Keyboard device

The present invention relates to the field of input devices, and in particular to a keyboard device.

With the rapid development of technology, the vigorous development of electronic devices has brought a lot of convenience to human life. Therefore, how to make the operation of electronic devices more user-friendly is an important issue. Common input devices of electronic devices include mouse devices, keyboard devices, and trackball devices. Among them, keyboard devices allow users to directly input text and symbols into the computer, so they are quite important.

The keyboard device includes a plurality of key structures, each of which mainly includes a key cap, a scissor-type connection assembly, a thin film circuit board and a key bottom plate stacked in sequence. If it is a model of an illuminated keyboard, a backlight module will be additionally arranged below the key bottom plate. Specifically, a thin film circuit board has a thin film switch, and an elastic element is arranged between the key cap and the thin film circuit board. The scissor-type connection assembly is connected between the key cap and the key bottom plate, and includes a first frame and a second frame pivotally connected to the first frame, so that the first frame and the second frame can swing relative to each other. Among them, when the key cap of any key structure is pressed and moves downward relative to the key base plate, the first frame and the second frame of the scissor-type connection assembly will change from an open-closed state to a stacked state, and the key cap moving downward will squeeze the elastic element, so that the elastic element will press against and trigger the corresponding membrane switch, and the keyboard device will generate a corresponding key signal. When the key cap of the key structure is no longer pressed, the key cap will move upward relative to the key base plate in response to the elastic restoring force of the elastic element. At this time, the first frame and the second frame will change from a stacked state to an open-closed state, and the key cap will return to its original position.

However, it is known that when the keycap of a keyboard device needs to be removed, the user usually removes the keycap directly by hand or by using an additional removal tool. However, whether the keycap is removed directly by hand or by using a removal tool, there is a risk of damage to the key structure due to improper force application. For example, the first frame or the second frame of the scissor-type connection assembly may be broken due to improper force application during the process of removing the keycap by hand or with a removal tool. Therefore, how to improve the above-mentioned problem is indeed the focus of relevant personnel in this field.

One of the purposes of the present invention is to provide a keyboard device with a quickly removable key structure.

Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

In order to achieve one or part or all of the above purposes or other purposes, the present invention provides a keyboard device, including at least one key structure, including a key cap, a first base plate, a second base plate and a connecting assembly. The first base plate is arranged below the key cap. The first base plate includes a first hook, which extends in a direction close to the key cap. The second base plate is arranged below the first base plate and can move relative to the first base plate. The second base plate includes a second hook, which extends in a direction close to the key cap and passes through the first base plate. The connecting assembly is arranged between the key cap and the first base plate. The key cap is lifted and lowered relative to the first base plate by the connecting assembly. The connecting assembly includes a first pivot part and a second pivot part. The first pivot part is pivoted to the first hook of the first base plate. The second pivot part is pivoted to the second hook of the second base plate. In response to the push of external force, the second base plate moves from the first position to the second position relative to the first base plate, and during the movement of the second base plate, the second hook is driven to disengage from the second pivoting portion pivoted to the connecting assembly.

In one embodiment of the present invention, the above-mentioned connecting assembly further includes an outer frame and an inner frame pivotally connected to each other, the outer frame includes a first pivot portion and a third pivot portion, the inner frame includes a second pivot portion and a fourth pivot portion, the third pivot portion of the outer frame is pivotally connected to one side of the key cap, and the fourth pivot portion of the inner frame is pivotally connected to the opposite side of the key cap.

In one embodiment of the present invention, the first bottom plate further includes a first sliding hole, and the second bottom plate further includes a guide column, which extends toward the key cap and passes through the first sliding hole of the first bottom plate. In response to the push of an external force, the guide column moves in the first sliding hole, and in the process of the movement of the guide column, the second bottom plate is driven to move between the first position and the second position.

In one embodiment of the present invention, the keyboard device further includes at least one actuating assembly. The actuating assembly is connected to the guide column of the second base plate, and in response to the push of external force, the actuating assembly drives the guide column to move in the first sliding hole.

In one embodiment of the present invention, the keyboard device further includes a keyboard frame. The keyboard frame includes at least one opening and at least one second sliding hole. The key structure is located in the opening and partially exposed outside the opening, the actuating assembly is located in the second sliding hole and partially exposed outside the second sliding hole, and the actuating assembly can move in the second sliding hole.

In one embodiment of the present invention, the actuating assembly includes a sliding button, a buckle and a linkage. The buckle is connected to the sliding button and extends toward the second bottom plate. The linkage is connected between the buckle and the guide column of the second bottom plate.

In one embodiment of the present invention, the above-mentioned sliding button includes a top surface and a bottom surface facing each other, and the buckle includes a column and a limit block, and the column extends from the bottom surface toward the direction close to the second bottom plate and is connected to the limit block.

In one embodiment of the present invention, the top surface of the sliding torsion is a continuously curved surface.

In one embodiment of the present invention, the above-mentioned linkage includes a buckling portion and at least one connecting portion. The buckling portion is buckled on the column of the buckle, so that the buckling portion is between the bottom surface of the slider and the limiting block of the buckle, and the connecting portion is connected to the guide column of the second bottom plate.

In one embodiment of the present invention, the above-mentioned key structure further includes a thin film circuit board. The thin film circuit board is arranged between the key cap and the first base plate, and the first hook of the first base plate passes through the thin film circuit board and is pivotally connected to the first pivotal part of the connecting assembly, and the second hook of the second base plate passes through the thin film circuit board and is pivotally connected to the second pivotal part of the connecting assembly.

The keyboard device of the embodiment of the present invention has a key structure in which the second bottom plate can move relative to the first bottom plate, and then the second bottom plate is driven to move relative to the first bottom plate by the actuating assembly, so that the second bottom plate drives the second hook to disengage from the second pivoting part of the connecting assembly during the movement relative to the first bottom plate, or drives the second hook to re-pivot with the second pivoting part of the connecting assembly. Under such a structural design, the user only needs to turn the actuating assembly to easily and quickly disassemble the connecting assembly and the key cap from the first bottom plate and the second bottom plate, or assemble the connecting assembly together with the key cap on the first bottom plate and the second bottom plate.

In order to make the above and other purposes, features and advantages of the present invention more clearly understood, the following is a detailed description of the preferred embodiment with the accompanying drawings.

1: Keyboard device

10: Keyboard

11: Button structure

12: Actuation assembly

100: Opening

101: Second sliding hole

110:Keycaps

111: First base plate

112: Second base plate

113:Connection components

114: Thin film circuit board

121: Button

122: Fasteners

123: Linkage

1110: First hook

1111: First sliding hole

1120: Second hook

1121:Guide column

1131: External frame

1132: Internal frame

1141: The first hollowed-out area

1142: The second hollowed-out area

1211: Top surface

1212: Bottom surface

1221: Column

1222: Limit block

1231: Detention Department

1232:Connection part

P1: First position

P2: Second position

V1: First joint

V2: Second joint

V3: The third joint

V4: The fourth joint

Figure 1 is a schematic diagram of the partial appearance structure of a keyboard device of an embodiment of the present invention.

Figure 2 is a schematic diagram of the component breakdown of the key structure shown in Figure 1.

Figure 3 is a schematic cross-sectional view along the AA line segment shown in Figure 1.

Figure 4 is a schematic diagram of the connection relationship between the actuating assembly, the first base plate and the second base plate shown in Figure 2.

Figures 5A and 5B are schematic diagrams of the operating relationship between the actuating assembly, the first base plate, and the second base plate shown in Figures 2, 3, and 4.

FIG6 is a schematic top view of a local area of the keyboard device shown in FIG1.

Please refer to Figures 1 to 6. Figure 1 is a schematic diagram of the partial appearance structure of a keyboard device of an embodiment of the present invention. Figure 2 is a schematic diagram of the component decomposition of the key structure shown in Figure 1. Figure 3 is a schematic diagram of a cross-section along the AA line segment shown in Figure 1. Figure 4 is a schematic diagram of the connection relationship between the actuating assembly shown in Figure 2, the first base plate and the second base plate. Figures 5A and 5B are schematic diagrams of the actuating relationship between the actuating assembly shown in Figures 2, 3 and 4, the first base plate and the second base plate. Figure 6 is a schematic diagram of a top view of a partial area of the keyboard device shown in Figure 1.

As shown in FIG1 , the keyboard device 1 of the present embodiment includes a keyboard frame 10 and a plurality of key structures 11 disposed on the keyboard frame 10. The keyboard frame 10 includes a plurality of openings 100, and the key structures 11 are respectively located in the corresponding openings 100 and partially exposed outside the openings 100. In the present embodiment, the key structures 11 can be classified into general keys, numeric keys, and function keys, etc., which are respectively used for users to press with their fingers to make the keyboard device 1 generate corresponding key signals to the computer, thereby making the computer execute corresponding functions, for example, general keys are used to input symbols such as English letters, numeric keys are used to input numbers, and function keys are used to provide various shortcut functions, such as F1~F12, etc. It should be noted that the keyboard device 1 shown in FIG. 1 only shows the number of partial key structures 11. The present invention does not limit the number of key structures 11. The number of key structures 11 can be increased according to actual needs or only one key structure can be provided.

The following further describes the detailed structure of the key structure 11 of the keyboard device 1 of the embodiment of the present invention.

As shown in FIGS. 1 to 4 , the key structure 11 of the present embodiment includes a key cap 110, a first bottom plate 111, a second bottom plate 112, and a connecting assembly 113. The first bottom plate 111 is disposed below the key cap 110, and the first bottom plate 111 includes a first hook 1110 extending toward the key cap 110. The second bottom plate 112 is disposed below the first bottom plate 111, so that the first bottom plate 111 is located between the key cap 110 and the second bottom plate 112, and the second bottom plate 112 can move relative to the first bottom plate 111. The second bottom plate 112 includes a second hook 1120 extending toward the key cap 110 and passing through the first bottom plate 111. The connecting assembly 113 is disposed between the key cap 110 and the first bottom plate 111. The key cap 110 is lifted and lowered relative to the first base plate 111 by the connecting assembly 113. The connecting assembly 113 includes a first pivot portion V1 and a second pivot portion V2. The first pivot portion V1 is pivoted to the first hook 1110 of the first base plate 111, and the second pivot portion V2 is pivoted to the second hook 1120 of the second base plate 112.

In this example, the second bottom plate 112 can move relative to the first bottom plate 111 in response to the push of external force, and during the movement of the second bottom plate 112, the second hook 1120 is driven to disengage from the second pivoting portion V2 pivoted to the connecting assembly 113, so that the user can easily remove the connecting assembly 113 together with the key cap 110 from the first bottom plate 111 and the second bottom plate 112. In this embodiment, the material of the first bottom plate 111 and the second bottom plate 112 is, for example, metal material, but the present invention is not limited thereto.

In this embodiment, the connection assembly 113 is, for example, a scissor-type connection assembly, but the present invention is not limited thereto. In this embodiment, the connection between the connection assembly 113 and the first bottom plate 111 and the second bottom plate 112 is respectively provided by the first hook 1110 and the second hook 1120 for the connection assembly 113 to be connected, but the present invention is not limited thereto. The connection between the connection assembly 113 and the first bottom plate 111 and the second bottom plate 112 can be selected according to the actual situation. Different connection methods are used. In addition, the operation method of the connection assembly 113 of this embodiment is the same as the known technology, so it is not repeated.

As shown in FIGS. 1 to 4 , the connection assembly 113 of the present embodiment further includes an outer frame 1131 and an inner frame 1132 pivoted to each other. The first pivot portion V1 is located on the outer frame 1131, and the outer frame 1131 further includes a third pivot portion V3. The second pivot portion V2 is located on the inner frame 1132, and the inner frame 1132 further includes a fourth pivot portion V4. In the present embodiment, the connection assembly 113 pivots to one side of the bottom surface of the key cap 110 with the third pivot portion V3 of the outer frame 1131, and the connection assembly 113 pivots to the opposite side of the bottom surface of the key cap 110 with the fourth pivot portion V4 of the inner frame 1132.

As shown in FIGS. 1 to 4 , the first bottom plate 111 of the present embodiment further includes a first sliding hole 1111, and the second bottom plate 112 further includes a guide column 1121. The guide column 1121 of the second bottom plate 112 extends toward the key cap 110 and passes through the first sliding hole 1111 of the first bottom plate 111. The guide column 1121 of the second bottom plate 112 can move in the first sliding hole 1111 in response to external force, that is, the first sliding hole 1111 can limit the movement of the guide column 1121 within a specific range. During the movement of the guide column 1121 in the first sliding hole 1111, the guide column 1121 drives the second bottom plate 112 to move relative to the first bottom plate 111.

As shown in FIGS. 1 to 4 , the key structure 11 of the present embodiment further includes a thin film circuit board 114. The thin film circuit board 114 is disposed between the key cap 110 and the first base plate 111, and the thin film circuit board 114 includes a first hollow area 1141 and a second hollow area 1142. In the present embodiment, the first hook 1110 of the first base plate 111 passes through the first hollow area 1141 of the thin film circuit board 114 and is pivotally connected to the first pivot part V1 of the connecting component 113, and the second hook 1120 of the second base plate 112 passes through the second hollow area 1142 of the thin film circuit board 114 and is pivotally connected to the second pivot part V2 of the connecting component 113. In this embodiment, when the key cap 110 moves downward relative to the first base plate 111 through the connecting assembly 113, the conductive member (not shown) on the key cap 110 is simultaneously driven to move toward the direction close to the thin film circuit board 114 and contact the thin film switch (not shown) on the thin film circuit board 114, thereby generating a corresponding key signal.

As shown in FIGS. 1 to 4 , the keyboard device 1 of the present embodiment further includes at least one actuating assembly 12. The actuating assembly 12 is connected to the guide column 1121 of the second bottom plate 112, and the actuating assembly 12 can drive the guide column 1121 to move in the first sliding hole 1111 of the first bottom plate 111 in response to the push of an external force. In other words, when the actuating assembly 12 is pushed, the actuating assembly 12 drives the second bottom plate 112 to move relative to the first bottom plate 111 through the guide column 1121. In the present embodiment, the keyboard frame 10 further includes at least one second sliding hole 101. The actuating assembly 12 is located in the second sliding hole 101 of the keyboard frame 10, and a portion of the actuating assembly 12 is exposed outside the second sliding hole 101. When the actuating assembly 12 is pushed in response to an external force, the actuating assembly 12 can move in the second sliding hole 101 of the key frame 10, that is, the second sliding hole 101 can limit the actuating assembly 12 to move within a specific range.

As shown in FIGS. 1 to 4 , the actuating assembly 12 of this embodiment includes a sliding button 121, a buckle 122, and a link 123. The buckle 122 is connected to the sliding button 121 and extends toward the second bottom plate 112. The link 123 is connected between the buckle 122 and the guide column 1121 of the second bottom plate 112. In this embodiment, the sliding button 121 and the buckle 122 are an integrally formed structure, but the present invention is not limited thereto. In other embodiments, the sliding button 121 and the buckle 122 may also be separate components.

As described above, the slider 121 of this embodiment includes a top surface 1211 and a bottom surface 1212 facing each other, and the buckle 122 includes a column 1221 and a stop block 1222. The column 1221 of the buckle 122 extends from the bottom surface 1212 of the slider 121 toward the second bottom plate 112 and is connected to the stop block 1222. In this embodiment, the top surface 1211 of the slider 121 is, for example, a continuously curved surface, but the present invention is not limited thereto. The top surface 1211 of the slider 121 is a continuously curved surface for increasing the friction between the user's finger and the slider 121, so that the user can push the slider 121 more surely and easily, thereby driving the second bottom plate 112 to move relative to the first bottom plate 111.

As described above, the linking member 123 of this embodiment includes a buckling portion 1231 and at least one connecting portion 1232. The buckling portion 1231 of the linking member 123 is buckled on the column 1221 of the buckle 122, so that the buckling portion 1231 is located between the slide button 121 and the limiting block 1222. The connecting portion 1232 of the linking member 123 is connected to the guide column 1121 of the second bottom plate 112. In this embodiment, after the connecting portion 1232 of the linking member 123 and the guide column 1121 of the second bottom plate 112 are connected to each other, the connecting portion 1232 and the guide column 1121 can be fixed by hot melting at the connection between the connecting portion 1232 and the guide column 1121, but the present invention does not limit the fixing method between the connecting portion 1232 and the guide column 1121.

The following further describes the operating relationship between the actuating assembly 12, the first base plate 111 and the second base plate 112 of the embodiment of the present invention.

As shown in FIG. 5A and FIG. 5B , and please refer to FIG. 2 , FIG. 3 and FIG. 5 at the same time, when the user wants to remove the connecting assembly 113 together with the key cap 110 from the first bottom plate 111 and the second bottom plate 112, the user can use a finger to push the actuating assembly 12 shown in FIG. 5A to the right, that is, push the sliding button 121, so that the sliding button 121 moves to the right in the second sliding hole 102 of the key frame 10. At this time, the locking member 122 connected to the sliding button 121 and the linking member 123 buckled on the locking member 122 will be driven by the sliding button 121 and move to the right at the same time. When the actuating assembly 12 moves to the right, the guide column 1121 connected to the link 123 is driven by the link 123 to move to the right in the first slide hole 1111. When the guide column 1121 moves to the right, the guide column 1121 drives the second bottom plate 112 to move to the right at the same time, so that the second bottom plate 112 moves from the first position P1 to the second position P2 as shown in FIG. 5B. At this time, the second hook 1120 on the second bottom plate 112 moves to the right at the same time and is disengaged from the second pivot portion V2 of the connecting assembly 113.

Based on the above, on the premise that the second pivot portion V2 of the connecting assembly 113 is first disengaged from the second hook 1120 of the second bottom plate 112, the user can easily disengage the first pivot portion V1 of the connecting assembly 113 from the first hook 1110 of the first bottom plate 111, so that the connecting assembly 113 together with the key cap 110 can be completely removed from the first bottom plate 111 and the second bottom plate 112. Since the first pivot part V1 and the second pivot part V2 of the connecting assembly 113 have been completely disconnected from the first hook 1110 and the second hook 1120, the subsequent user can also easily disconnect the third pivot part V3 and the fourth pivot part V4 of the connecting assembly 113 from the key cap 110, so that the connecting assembly 113 is separated from the key cap 110.

It is worth mentioning that, as shown in FIG6 , the actuating assembly 12 of the present embodiment can remove the connecting assembly 113 of two adjacent key structures 11 at the same time. Specifically, the connecting member 123 of the actuating assembly 12 of the present embodiment has two connecting portions 1232, and these connecting portions 1232 are respectively connected to the guide cylinders 1121 on the second bottom plates 112 of the two adjacent key structures 11. When the actuating assembly 12 is turned, the actuating assembly 12 will simultaneously drive the second bottom plates 112 and the corresponding first bottom plates 111 of the two adjacent key structures 11 to move, so that the connecting assemblies 113 of the two adjacent key structures 11 are removed from the first bottom plate 111 and the second bottom plate 112 at the same time. It should be noted that the above-mentioned design of one actuating assembly 12 corresponding to two key structures is only one embodiment of the present invention, and the present invention is not limited thereto. In other embodiments, one actuating assembly 12 may also correspond to only one key structure.

In summary, the keyboard device of the embodiment of the present invention has a key structure that allows the second base plate to move relative to the first base plate, and then drives the second base plate to move relative to the first base plate through the actuating assembly, so that the second base plate drives the second hook to disengage from the second pivoting portion of the connecting assembly during the movement relative to the first base plate, or drives the second hook to re-join the second pivoting portion of the connecting assembly. Under such a structural design, the user only needs to turn the actuating assembly to easily and quickly disassemble the connecting assembly and the key cap from the first base plate and the second base plate, or assemble the connecting assembly together with the key cap on the first base plate and the second base plate.

However, the above is only the preferred embodiment of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made according to the scope of the patent application and the content of the invention description are still within the scope of the present invention. In addition, any embodiment or patent application of the present invention does not need to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract and title are only used to assist in searching patent documents, and are not used to limit the scope of the rights of the present invention. In addition, the terms "first" and "second" mentioned in this specification or patent application are only used to name the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

10: Keyboard

11: Button structure

12: Actuation assembly

100: Opening

101: Second sliding hole

110:Keycaps

111: First base plate

112: Second base plate

113:Connection components

114: Thin film circuit board

121: Button

122: Fasteners

123: Linkage

1110: First hook

1111: First sliding hole

1120: Second hook

1121:Guide column

1131: External frame

1132: Internal frame

1141: The first hollowed-out area

1142: The second hollowed-out area

1211: Top surface

1212: Bottom surface

1221: Column

1222: Limit block

1231: Detention Department

1232:Connection part

V1: First joint

V2: Second joint

V3: The third joint

V4: The fourth joint

Claims (8)

A keyboard device includes: at least one key structure, including: a key cap; a first bottom plate, arranged below the key cap, the first bottom plate including a first hook and a first sliding hole, the first hook extending in a direction close to the key cap; a second bottom plate, arranged below the first bottom plate and movable relative to the first bottom plate, the second bottom plate including a second hook and a guide column, the second hook extending in a direction close to the key cap and passing through the first bottom plate, the guide column extending in a direction close to the key cap and passing through the first sliding hole of the first bottom plate; a connecting assembly, arranged between the key cap and the first bottom plate, the key cap being lifted and lowered relative to the first bottom plate by the connecting assembly, the connecting assembly including a first pivot part and a second pivot part, the first pivot part pivotally connected to the first bottom plate The first hook of the first base plate, the second pivot part pivots to the second hook of the second base plate; and at least one actuating assembly, the at least one actuating assembly is connected to the guide column of the second base plate, wherein, in response to the push of external force, the second base plate moves from a first position to a second position relative to the first base plate, and during the movement of the second base plate, the second hook is driven to disengage from the second pivot part pivoted to the connecting assembly, wherein, in response to the push of external force, the guide column moves in the first sliding hole, and during the movement of the guide column, the second base plate is driven to move between the first position and the second position, wherein, in response to the push of external force, the at least one actuating assembly drives the guide column to move in the first sliding hole. A keyboard device as described in claim 1, wherein the connection assembly further includes an outer frame and an inner frame pivotally connected to each other, the outer frame includes the first pivot portion and a third pivot portion, the inner frame includes the second pivot portion and a fourth pivot portion, the third pivot portion of the outer frame is pivotally connected to one side of the key cap, and the fourth pivot portion of the inner frame is pivotally connected to the other side of the key cap. The keyboard device as described in claim 1 further includes a keyboard frame, the keyboard frame includes at least one opening and at least one second sliding hole, the at least one key structure is located in the at least one opening and partially exposed outside the at least one opening, the at least one actuating component is located in the at least one second sliding hole and partially exposed outside the at least one second sliding hole, and the at least one actuating component can move in the at least one second sliding hole. A keyboard device as described in claim 1, wherein the at least one actuating component includes a sliding button, a latch and a linkage, the latch is connected to the sliding button and extends toward the second bottom plate, and the linkage is connected between the latch and the guide column of the second bottom plate. A keyboard device as described in claim 4, wherein the sliding button includes a top surface and a bottom surface opposite to each other, and the latch includes a column and a stop block, wherein the column extends from the bottom surface toward the second bottom plate and is connected to the stop block. A keyboard device as described in claim 5, wherein the top surface of the slider is a continuously curved surface. As described in claim 5, the linkage includes a buckling portion and at least one connecting portion, the buckling portion is buckled on the column of the buckle, so that the buckling portion is located between the bottom surface of the slider and the limit block of the buckle, and the at least one connecting portion is connected to the guide column of the second bottom plate. A keyboard device as described in claim 1, wherein the at least one key structure further includes a thin film circuit board, the thin film circuit board is disposed between the key cap and the first base plate, and the first hook of the first base plate passes through the thin film circuit board and is pivotally connected to the first pivotal portion of the connecting assembly, and the second hook of the second base plate passes through the thin film circuit board and is pivotally connected to the second pivotal portion of the connecting assembly.