TWI910872B - Touchpad device - Google Patents

Abstract

A touchpad device includes a substrate, a touch panel and a trigger element. The substrate has a top surface. The touch panel is disposed above the top surface of the substrate and is located at a height position. The touch panel has a bottom surface facing the top surface and a switch on the bottom surface. The switch has a pressure-receiving portion. The trigger element is disposed between the switch and the substrate. The trigger element is fixed on the top surface and includes a pressing sheet and an elastic buffer layer. The touch panel can move from the height position toward the substrate to a triggering position. When the touch panel is at the triggering position, the pressing sheet directly presses the pressure-receiving portion to trigger the switch, and the elastic buffer layer is pressed by the switch.

Description

Touchpad device

This invention relates to an input device, and more particularly to a touchpad device.

A touchpad is a widely used computer input device used to sense the movement or pressing of a user's finger to control cursor movements (such as controlling cursor displacement or clicking).

Currently known touchpad structures include a touch panel and a substrate. The touch panel is positioned above the substrate and can move up and down relative to it. A switch is located at the bottom of the touch panel. When the touch panel is pressed by the user and descends towards the substrate, the switch approaches the substrate and is activated by the substrate's pressure. However, during each descent of the touch panel, the switch and the substrate collide, generating noise and affecting user comfort.

In view of the above, in one embodiment, a touch panel device is provided, including a substrate, a touch panel, and a trigger. The substrate has a top surface. The touch panel is disposed above the top surface of the substrate at a certain height position, and the touch panel has a bottom surface facing the top surface, on which a switch is provided, the switch having a pressure receiving portion. The trigger is disposed between the switch and the substrate, the trigger is fixed to the top surface, and includes a pressure plate and an elastic cushioning layer. The touch panel can be moved from the height position toward the substrate to a trigger position. When the touch panel is in the trigger position, the pressure plate directly presses against the pressure receiving portion to trigger the switch, and the elastic cushioning layer is pressed by the switch.

In summary, the touchpad device of this invention has a pressure plate and an elastic cushioning layer through the trigger element. When the touchpad is pressed and moves to the trigger position, the elastic cushioning layer is pressed by the switch, which greatly reduces the noise generated by the collision between the pressure part of the switch and the pressure plate, and the user's pressing feel is also more comfortable.

It should be noted that in the descriptions of the various embodiments, the terms "first" and "second" are used to describe different elements, and these elements are not limited by such terms. Furthermore, for ease of explanation and clarity, the thickness or dimensions of the elements in the drawings are expressed in an exaggerated, omitted, or approximate manner for the understanding and reading of those skilled in the art. The dimensions of each element are not exactly their actual dimensions and are not intended to limit the implementation of the invention; therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose achieved by the invention, should still fall within the scope of the technical content disclosed in the invention. The same reference numerals will be used in all drawings to denote the same or similar elements.

Figure 1 is a schematic diagram of the application of the touchpad device of the present invention, Figure 2 is an exploded perspective view of the first embodiment of the touchpad device of the present invention, and Figure 3 is a partial cross-sectional view of the first embodiment of the touchpad device of the present invention. As shown in Figures 1 and 2, the touchpad device 1 of the present invention can be applied to computer products. Users can operate the touchpad device 1 by sliding or pressing their fingers to control the cursor displacement or generate corresponding control signals. For example, as shown in Figure 1, in this embodiment, the touchpad device 1 is applied to a notebook computer N. However, this is not limited to this; in other embodiments, the touchpad device 1 can also be applied to other portable computers (such as tablet computers). Alternatively, the touchpad device 1 may be a standalone device connected to a portable computer; this embodiment is not limiting.

As shown in Figures 2 and 3, the touchpad device 1 includes a substrate 10, a touch panel 20, and a trigger 30. The substrate 10 can be a rigid plate made of metal (such as iron, aluminum, or alloy) or plastic. The substrate 10 has a top surface 11, and the touch panel 20 and the trigger 30 are both disposed above the top surface 11 of the substrate 10.

As shown in Figures 2 and 3, the touch panel 20 is used for touch or press operation by the user. In this embodiment, the touch panel 20 includes a touch plate 21 and a circuit board 22 that are stacked and fixed together. The circuit board 22 is close to the substrate 10 relative to the touch plate 21. The touch plate 21 is used for touch or press operation by the user. The circuit board 22 can generate functions such as scrolling, zooming, or opening windows in response to the user's finger gestures or sliding movements on the touch plate 21. Alternatively, the circuit board 22 can generate functions such as selecting or displaying a menu in response to the user's finger pressing, tapping, or double-tapping on the touch plate 21.

In some embodiments, the contact plate 21 may be a plate made of glass or polyester resin (mylar). The circuit board 22 may be a membrane, a printed circuit board (PCB), a flexible printed circuit board (FPCB), or a rigid-flex PCB, etc. Furthermore, the contact plate 21 and the circuit board 22 may also be combined into a single board. For example, the adjacent surfaces of the contact plate 21 and the circuit board 22 may be bonded together to form a single board using adhesive, chemical adhesive (e.g., UV-curable adhesive), or physical adhesive (e.g., thermosetting adhesive or thermoplastic adhesive).

As shown in Figures 2 and 3, the touch panel 20 is disposed above the top surface 11 of the substrate 10 and is positioned at a certain height when not under pressure (as shown in Figure 3), maintaining a distance between the touch panel 20 and the top surface 11 of the substrate 10, and allowing the touch panel 20 to move towards the substrate 10 when pressure is applied. For example, in this embodiment, the touch panel 20 has a bottom surface 23 facing the top surface 11 of the substrate 10. The bottom surface 23 of the touch panel 20 has a first side 231 and a second side 232, which are opposite sides of the bottom surface 23. The first side 231 is fixed to the top surface of the substrate 10 by a spacer 15. 11, wherein the spacer 15 can be a long strip block or plate, and the material of the spacer 15 can be metal, plastic, rubber, silicone or sponge, etc., so that the touch panel 20 and the substrate 10 maintain a distance and are located at the aforementioned height position, and when the touch panel 20 is pressed, the touch panel 20 can swing relative to the substrate 10 with the first side 231 as the swing fulcrum.

In some embodiments, the aforementioned spacer 15 can be fixed between the first side 231 of the touch panel 20 and the substrate 10 by means of adhesive, spot welding or locking. For example, adhesive can be provided on the two surfaces of the spacer 15 that contact the first side 231 of the touch panel 20 and the substrate 10, so that the touch panel 20, the spacer 15 and the substrate 10 are bonded and fixed together.

However, the above embodiments are merely examples. In other embodiments, the touch panel 20 can also be connected to the substrate 10 in different ways. For example, multiple balance levers can be connected between the touch panel 20 and the substrate 10 so that the touch panel 20 is positioned at the above-mentioned height and can move up and down relative to the substrate 10. That is to say, the touch panel 20 is not limited to the above-mentioned swing-type connection method.

As shown in Figures 2 and 3, a switch 25 is provided on the bottom surface 23 of the touch panel 20, and the switch 25 has a pressure-receiving portion 265. When the pressure-receiving portion 265 is pressed, the switch 25 can be triggered to generate a corresponding signal. In this embodiment, the switch 25 is located on the second side 232 of the bottom surface 23. When the touch panel 20 is pressed and swings relative to the substrate 10 with the first side 231 as the swing fulcrum, the second side 232 can move toward the substrate 10, so that the switch 25 moves toward the substrate 10 synchronously.

As shown in Figures 2 and 3, in this embodiment, the switch 25 is a dome switch and includes an elastic dome 26. For example, the elastic dome 26 can be a metal dome, a rubber dome, or other plastic dome, but this is not limited. In some embodiments, the switch 25 can also be other forms of button switches or other types of switches.

As shown in Figures 2 and 3, in this embodiment, the elastic dome 26 of the switch 25 has an annular bottom 261, a central top 262, and an elastic connecting portion 263. The annular bottom 261 is fixed to the bottom surface 23 of the touch panel 20, and the central top 262 is close to the substrate 10 relative to the annular bottom 261. The elastic connecting portion 263 is an annular spring piece integrally connected between the annular bottom 261 and the central top 262. The pressure-receiving portion 265 of the switch 25 is a protrusion integrally connected to the central top 262 of the elastic dome 26. In this way, when the pressure-bearing part 265 of the switch 25 is subjected to external force, the central top part 262 of the elastic dome 26 can move and shrink towards the touch panel 20, causing the elastic connecting part 263 to undergo elastic deformation, thereby triggering the circuit on the circuit board 22 to generate a signal. When the aforementioned external force is released, the elastic dome 26 can return to its original undeformed state.

As shown in Figures 2 and 3, the trigger 30 is disposed between the switch 25 of the touch panel 20 and the substrate 10. The trigger 30 is fixed to the top surface 11 of the substrate 10, for example, the trigger 30 can be assembled and fixed to the top surface 11 of the substrate 10 by adhesive. The trigger 30 includes a pressure sheet 31 and an elastic cushioning layer 35, and there are no other components blocking the pressure sheet 31 and the pressure-receiving portion 265 of the switch 25 of the touch panel 20. In some embodiments, the aforementioned elastic cushioning layer 35 may be an elastic layer made of an elastic material, such as rubber, silicone, polyurethane, or polyethylene. Alternatively, the elastic cushioning layer 35 may be an elastic foam layer (such as water-absorbing foam, latex foam, or foam tape), so that the elastic cushioning layer 35 can undergo elastic deformation when subjected to external force and return to its original shape when the external force is removed. The pressure plate 31 may be a non-elastic hard sheet made of metal (such as iron, aluminum, or alloy) or plastic, and the hardness of the pressure plate 31 is greater than the hardness of the elastic cushioning layer 35.

Figure 4 is an animation diagram of the first embodiment of the touch panel device of the present invention. Referring to Figures 3 and 4, when the touch panel 20 is pressed, it can move from the above-mentioned height position (as shown in Figure 3) toward the substrate 10 to a trigger position (as shown in Figure 4). When the touch panel 20 is in the trigger position, since there are no other components blocking the pressure plate 31 and the pressure-receiving part 265 of the switch 25, the pressure plate 31 can directly press against the pressure-receiving part 265 of the switch 25, so that the switch 25 can be successfully triggered. In addition, the elastic cushioning layer 35 will also be compressed and deformed by the pressure of the switch 25. In this way, during the process of the touch panel 20 being pressed down, the elastic cushioning layer 35 can play a cushioning role, which can greatly reduce the noise generated by the collision between the pressure part 265 of the switch 25 and the pressure plate 31, reduce the sound generated when the elastic dome 26 of the switch 25 collapses and deforms, and improve the user's comfort when pressing.

Furthermore, the trigger 30 can be fitted with different elastic cushioning layers 35 according to actual usage needs. Alternatively, the thickness of the pressure plate 31 and the thickness of the elastic cushioning layer 35 can be designed to be the same or different (for example, the thickness of the elastic cushioning layer 35 can be greater than, equal to, or less than the thickness of the pressure plate 31). Furthermore, the pressure plate 31 and the elastic cushioning layer 35 of the trigger 30 can have various different configurations, thereby producing different pressing sensations to meet the needs of different users or different usage scenarios. The following are illustrations of various embodiments of the trigger 30.

As shown in Figures 3 and 4, the pressing sheet 31 and the elastic cushioning layer 35 of the trigger 30 are stacked and bonded together. In this embodiment, the trigger 30 includes a first adhesive layer 32 and a second adhesive layer 33. The elastic cushioning layer 35 has a first surface 36 and a second surface 37 facing each other. The first adhesive layer 32 is stacked... The first surface 36 is fixed to the top surface 11 of the substrate 10 by the first adhesive layer 32. The second adhesive layer 33 is stacked on the second surface 37. The pressure sheet 31 is adhered to the second adhesive layer 33 and stacked and fixed on the second surface 37, so that the pressure sheet 31 is located between the switch 25 and the elastic cushioning layer 35. In this way, during the process of the touch panel 20 being pressed and moving to the trigger position, the pressure-receiving part 265 of the switch 25 will first contact and press against the pressure plate 31 of the trigger 30, and then press down on the elastic cushioning layer 35 through the pressure plate 31, so that the switch 25 indirectly presses against the elastic cushioning layer 35 through the pressure plate 31, thereby achieving the above-mentioned reduction of noise and improvement of user comfort when pressing.

Figure 5 is a partial perspective view of a second embodiment of the touchpad device of the present invention. As shown in Figure 5, the difference between this embodiment and the first embodiment described above is that the pressing piece 31a of the trigger 30a in this embodiment has a pressing surface 311 facing the pressure-receiving portion 265 of the switch 25, and the pressing surface 311 has at least one through-hole 313, for example, the through-hole 313 can be a groove or a through hole. In this embodiment, there are multiple through-holes 313 arranged at intervals, and at least a portion of the through-holes 313 are positioned corresponding to the positions of the pressure-receiving portion 265 of the switch 25. In this way, when the touch panel 20 is pressed and moves to the trigger position and the pressure part 265 of the switch 25 contacts the pressure surface 311 of the pressure plate 31a, the perforated part 313 can prevent the pressure part 265 from adsorbing or sticking to the pressure surface 311, thereby further reducing the noise during use.

Figure 6 is a partial perspective view of a third embodiment of the touchpad device of the present invention. As shown in Figure 6, the pressing piece 31b of the trigger 30b in this embodiment also has a pressing surface 311, and the pressing surface 311 faces the pressure-receiving portion 265 of the switch 25. The difference between this embodiment and the second embodiment described above is that the position of the pressing surface 311 of the pressing piece 31b in this embodiment corresponds to the position of the pressure-receiving portion 265 of the switch 25, and the pressing surface 311... The surface roughness is different from the surface roughness of the pressure-bearing part 265 of the switch 25. For example, the surface roughness of the pressing surface 311 can be greater than the surface roughness of the pressure-bearing part 265 of the switch 25. For example, the surface of the pressure-bearing part 265 of the switch 25 is a smooth and flat surface, while the pressing surface 311 is a surface with texture (such as raised or printed texture), but this is not a limitation. In this way, when the touch panel 20 is pressed and moves to the trigger position and the pressure portion 265 of the switch 25 contacts the pressure surface 311 of the pressure plate 31b, the difference in surface roughness between the pressure surface 311 and the pressure portion 265 can prevent adsorption or adhesion between the pressure portion 265 and the pressure surface 311, thereby further reducing noise during use.

Figure 7 is a partial cross-sectional view of the fourth embodiment of the touchpad device of the present invention, and Figure 8 is an animation diagram of the fourth embodiment of the touchpad device of the present invention. As shown in Figures 7 and 8, the difference between this embodiment and the first embodiment described above is that the second surface 37 of the elastic cushioning layer 35 of the trigger 30c in this embodiment has a central region 371 and an outer region 372. The outer region 372 surrounds the central region 371. The position of the central region 371 corresponds to the pressure portion 265 of the switch 25, and the position of the outer region 372 corresponds to the elastic connecting portion 263 of the switch 25. The size of the pressure plate 31c is smaller than the size of the elastic cushioning layer 35, and the pressure plate 31c is stacked and fixed in the central region 371 of the second surface 37 of the elastic cushioning layer 35. For example, the size of the pressure plate 31c may be equal to or slightly larger than the size of the pressure portion 265 of the switch 25. In this way, by not stacking the pressure plate 31c or other components above the outer peripheral area 372 of the elastic buffer layer 35 corresponding to the second surface 37 of the elastic buffer layer 35, a clearance space 314 can be formed around the pressure plate 31c and above the outer peripheral area 372. That is, the clearance space 314 is located between the elastic connection 263 of the switch 25 and the second surface 372 of the elastic buffer layer 35. Between the outer regions 372 of the two surfaces 37, as shown in FIG8, when the touch panel 20 is pressed and moves to the trigger position, causing the elastic connecting portion 263 of the elastic dome 26 of the switch 25 to undergo elastic deformation, the aforementioned clearance space 314 can prevent the elastic connecting portion 263 around the pressed portion 265 from contacting or hitting the pressure plate 31c, thereby further reducing noise during use.

Figure 9 is a partial cross-sectional view of a fifth embodiment of the touchpad device of the present invention. As shown in Figure 9, the difference between this embodiment and the first embodiment described above is that the pressing piece 31d of the trigger 30d in this embodiment has an outer ring surface 315, and the elastic cushioning layer 35d of the trigger 30d is an annular cushioning layer with an inner ring surface 355. The elastic cushioning layer 35d surrounds the pressing piece 31d, and the inner ring surface 355 of the elastic cushioning layer 35d is fixed. The outer annular surface 315 of the pressure plate 31d, for example, the inner annular surface 355 and the outer annular surface 315 can be glued and fixed together by an adhesive layer, so that the pressure plate 31d and the elastic cushioning layer 35d are concentrically stacked. The position of the pressure plate 31d corresponds to the pressure-bearing part 265 of the switch 25, and the position of the elastic cushioning layer 35d corresponds to the elastic connecting part 263 of the elastic dome 26. In this way, when the touch panel 20 is pressed and moves to the trigger position, the pressure plate 31d can directly press the pressure part 265 of the switch 25, and the elastic connecting part 263 of the elastic dome 26 of the switch 25 can directly press the elastic cushioning layer 35d, thus achieving the same effect of reducing noise and improving the user's comfort when pressing.

As shown in Figure 9, in this embodiment, the pressing piece 31d of the trigger 30d has a pressing surface 311 facing the pressure-receiving portion 265 of the switch 25. The thickness of the elastic cushioning layer 35d is greater than the thickness of the pressing piece 31d, forming a receiving groove 356 between the pressing surface 311 and the inner annular surface 355 of the elastic cushioning layer 35d. Furthermore, the pressure-receiving portion 265 of the switch 25 is located within the receiving groove 356, and the elastic connecting portion 263 of the elastic dome 26 of the switch 25 abuts against the elastic cushioning layer 35d. In this way, the elastic dome 26 of the switch 25 is in contact with the elastic cushioning layer 35d, which helps the touch panel 20 to maintain the above-mentioned height position when it is not pressed. When the touch panel 20 is pressed, the elastic connecting part 263 of the elastic dome 26 of the switch 25 can also press against the elastic cushioning layer 35d first to achieve the effect of cushioning and noise reduction.

Figure 10 is a partial cross-sectional view of the sixth embodiment of the touch panel device of the present invention. As shown in Figure 10, the pressing piece 31e and the elastic buffer layer 35e of the trigger 30e in this embodiment are also concentrically stacked with each other. That is, the elastic buffer layer 35e is an annular buffer layer and is combined with the periphery of the pressing piece 31e. The difference between this embodiment and the fifth embodiment mentioned above is that the elastic buffer layer 35e of the trigger 30e contacts the annular bottom 261 of the elastic dome 26 of the switch 25 rather than the elastic connecting part 263. In this way, the contact between the elastic cushioning layer 35e and the annular bottom 261 of the elastic dome 26 helps the touch panel 20 maintain the aforementioned height position when not under pressure. When the touch panel 20 is under pressure, the annular bottom 261 of the elastic dome 26 of the switch 25 can also press against the elastic cushioning layer 35e first to achieve the effect of cushioning and noise reduction. In addition, it can also prevent the elastic connecting part 263 of the elastic dome 26 from contacting other components for a long time, thus affecting its service life.

Figure 11 is a partial cross-sectional view of the seventh embodiment of the touch panel device of the present invention. As shown in Figure 11, the elastic buffer layer 35f of the trigger 30f of the present embodiment has an inner groove 351. The pressing piece 31f of the trigger 30f is stacked and fixed in the inner groove 351. The position of the pressing piece 31f corresponds to the pressure-receiving part 265 of the switch 25, and the pressure-receiving part 265 of the switch 25 is located in the inner groove 351. The elastic connecting part 263 of the elastic dome 26 of the switch 25 abuts against the elastic buffer layer 35f. In this way, when the touch panel 20 is pressed and moves to the trigger position, the pressure-receiving part 265 of the switch 25 can directly press the pressure plate 31f of the trigger 30f, and then the pressure plate 31f presses down on the elastic cushioning layer 35f. The elastic connecting part 263 of the elastic dome 26 of the switch 25 can also directly press the elastic cushioning layer 35f, thereby producing different pressing feel, and achieving the same effect of reducing noise and improving the user's comfort when pressing.

Figure 12 is a partial cross-sectional view of the eighth embodiment of the touch panel device of the present invention. As shown in Figure 12, in this embodiment, the pressing piece 31g of the trigger 30g and the elastic buffer layer 35g are also stacked and bonded to each other. The difference between this embodiment and the first embodiment is that the elastic buffer layer 35g is located between the switch 25 and the pressing piece 31g, and the pressing piece 31g is located between the elastic buffer layer 35g and the substrate 10. The pressing piece 31g has a pressing surface 311 and a... Assembly surface 312 is fixed to the top surface 11 of substrate 10. The pressing surface 311 faces the pressure-receiving part 265 of switch 25. The pressing surface 311 has a pressing area 3111 and an assembly area 3112. The position of the pressing area 3111 corresponds to the position of the pressure-receiving part 265 of switch 25. The elastic cushioning layer 35 is an annular cushioning layer and is stacked and fixed to the assembly area 3112 of the pressing surface 311. In this way, when the touch panel 20 is pressed and moves to the trigger position, the pressure-receiving part 265 of the switch 25 can directly press the pressure area 3111 of the 31g pressure plate of the trigger 30g, and the elastic connecting part 263 of the elastic dome 26 of the switch 25 can directly press the elastic cushioning layer 35g, thus achieving the above-mentioned reduction of noise and improvement of user comfort when pressing.

Although the technical content of this invention has been disclosed above by preferred embodiment, it is not intended to limit this invention. Any modifications and refinements made by those skilled in the art without departing from the spirit of this invention shall be covered within the scope of this invention. Therefore, the scope of protection of this invention shall be determined by the scope of the appended patent application.

N: Notebook 1: Touchpad Device 10: Baseboard 11: Top Surface 15: Spacer 20: Touch Panel 21: Touch Plate 22: Circuit Board 23: Bottom Surface 231: First Side 232: Second Side 25: Switch 26: Elastic Dome 261: Circular Bottom 262: Central Top 263: Elastic Connector 265: Pressure Receiving Part 30, 30a, 30b, 30c, 30d, 30e, 30f, 30g: Trigger 31, 31a, 31b, 31c, 31d, 31e, 31f, 31g: Pressure Plate 311: Pressing Surface 3111: Pressing Area 3112: Assembly Area 312: Assembly Surface 313: Opening Part 314: Clearance Space 315: Outer Circumferential Surface 32: First Adhesive Layer 33: Second Adhesive Layer 35, 35d, 35e, 35f, 35g: Elastic Cushioning Layer 351: Inner Groove 355: Inner Circumferential Surface 356: Receiving Groove 36: First Surface 37: Second Surface 371: Central Area 372: Outer Peripheral Area

Figure 1 is a schematic diagram illustrating the application of the touchpad device of the present invention. Figure 2 is an exploded perspective view of a first embodiment of the touchpad device of the present invention. Figure 3 is a partial sectional view of a first embodiment of the touchpad device of the present invention. Figure 4 is an animation diagram of a first embodiment of the touchpad device of the present invention. Figure 5 is a partial perspective view of a second embodiment of the touchpad device of the present invention. Figure 6 is a partial perspective view of a third embodiment of the touchpad device of the present invention. Figure 7 is a partial sectional view of a fourth embodiment of the touchpad device of the present invention. Figure 8 is an animation diagram of a fourth embodiment of the touchpad device of the present invention. Figure 9 is a partial sectional view of a fifth embodiment of the touchpad device of the present invention. Figure 10 is a partial cross-sectional view of the sixth embodiment of the touchpad device of the present invention. Figure 11 is a partial cross-sectional view of the seventh embodiment of the touchpad device of the present invention. Figure 12 is a partial cross-sectional view of the eighth embodiment of the touchpad device of the present invention.

1: Touchpad Device

10:Substrate

11: Top surface

15: Spacer

20: Touch panel

23: Bottom

231: First side

232: Second side

25: Switch

265: Compression area

30: Trigger

Claims (12)

A touchpad device includes: a substrate having a top surface; a touch panel disposed above the top surface of the substrate at a height position, the touch panel having a bottom surface facing the top surface, a switch having a pressure-receiving portion, wherein the switch further includes an elastic dome having an annular bottom, a central top, and an elastic connecting portion connecting the annular bottom and the central top, the pressure-receiving portion being located at the central top; and A trigger is disposed between the switch and the substrate. The trigger is fixed to the top surface and includes a pressure plate and an elastic cushioning layer. The hardness of the pressure plate is greater than the hardness of the elastic cushioning layer. The touch panel can be selectively moved from the height position toward the substrate to a trigger position. When the touch panel is in the trigger position, the pressure plate directly presses against the pressure-receiving part to trigger the switch, and the elastic cushioning layer is pressed by the switch. The touchpad device as described in claim 1, wherein the pressure plate and the elastic cushioning layer are stacked on top of each other. The touchpad device as described in claim 2, wherein the elastic cushioning layer has a first surface and a second surface opposite to each other, the first surface being fixed to the top surface of the substrate, and the pressure sheet being stacked and fixed to the second surface. The touchpad device as described in claim 3, wherein the second surface of the elastic cushioning layer has a central region, and the pressure plate is smaller than the size of the elastic cushioning layer and is fixed to the central region. The touchpad device as described in claim 4, wherein the second surface of the elastic cushioning layer has an outer region surrounding the central region, and the position of the elastic connection corresponds to the outer region of the elastic cushioning layer. The touchpad device as described in claim 1, wherein the pressure plate has an outer ring surface, and the elastic cushioning layer is an annular cushioning layer having an inner ring surface, the inner ring surface being fixed to the outer ring surface of the pressure plate. The touchpad device as described in claim 6, wherein the pressure plate has a pressure surface facing the pressure-receiving portion of the switch, and the thickness of the elastic cushioning layer is greater than the thickness of the pressure plate, such that a receiving groove is formed between the pressure surface and the inner annular surface of the elastic cushioning layer, and the pressure-receiving portion of the switch is located within the receiving groove. The touchpad device as described in claim 6, wherein the elastic cushioning layer contacts the annular bottom or the elastic connection of the elastic dome. The touchpad device as described in claim 1, wherein the pressure plate has an opposing pressure surface and an assembly surface, the assembly surface is fixed to the top surface of the substrate, the pressure surface faces the pressure-receiving portion of the switch, and the pressure surface has a pressure area and an assembly area, the position of the pressure area corresponds to the position of the pressure-receiving portion of the switch, and the elastic cushioning layer is stacked and fixed to the assembly area. The touchpad device as described in claim 1, wherein the elastic cushioning layer has an inner groove in which the pressure sheet is stacked and fixed. The touchpad device as described in claim 1, wherein the pressure plate has a pressure surface facing the pressure portion of the switch, and the pressure surface has at least one open portion. The touchpad device as described in claim 1, wherein the pressure plate has a pressure surface facing the pressure portion of the switch, and the surface roughness of the pressure surface is different from the surface roughness of the pressure portion.