keyboard

Abstract

A keyboard comprises a first substrate, a second substrate, a key circuit, a connecting member and a key assembly. The first substrate has a first through hole. The second substrate is arranged on the first substrate and has a second through hole. The second through hole is connected to the first through hole and is located within the inner edge of the first through hole. The key circuit is arranged on one of the first substrate and the second substrate. The connecting member connects the second through hole and extends to the bottom surface of the second substrate facing the first substrate. The key assembly is located on the top surface of the second substrate facing away from the first substrate, connected to the connecting member, and configured to trigger the key circuit.

Description

Technical Field

[0001] The invention relates to a keyboard. Background Art

[0002] For the keys on the keyboard, in order to balance the force applied by the user on each key, a connecting structure is usually provided under the keycap of the key to guide the keycap to move vertically.

[0003] Generally speaking, the aforementioned connecting structure is usually fixed in the keyboard by connecting to a hook formed on the bottom plate. One existing manufacturing method of the aforementioned bottom plate with a hook is to perform a stamping process on a sheet metal part, and then stamp out a hook that can be bent and erected. However, when connecting with the aforementioned hook, the connecting part of the connecting structure is limited to between the hook and the bottom plate. Therefore, the processing accuracy when bending the hook will have a great influence on the assembly tolerance between the connecting structure and the hook, which often causes problems such as key shaking and tilting. In addition, the aforementioned bottom plate and the connecting structure are generally made of metal, so when using the keyboard, metal knocking noise is often generated.

[0004] In addition, existing keyboards usually use film circuit boards as switch components for key signal generation. However, film circuit boards are easily damaged after frequent use or when improper force is applied, and are difficult to repair. When the trigger circuit corresponding to a certain key in the film circuit board is damaged, it is impossible to repair the corresponding trigger circuit for each individual key, and the film circuit board of the entire keyboard must be replaced, which makes the repair cost high. In addition, the film circuit board is a soft material and cannot serve as a structural support and mechanical coupling component. Therefore, existing keyboards usually need to add a base plate with higher hardness, making the overall structure more complicated and relatively difficult to assemble.

[0005] Therefore, how to provide a keyboard that can solve the above problems is one of the problems that the industry is eager to invest research and development resources to solve. Summary of the invention

[0006] In view of this, one object of the present invention is to provide a keyboard that can effectively solve the above-mentioned problem.

[0007] In order to achieve the above-mentioned object, according to one embodiment of the present invention, a keyboard comprises a first substrate, a second substrate, a key circuit, a connector and a key assembly. The first substrate has a first through hole. The second substrate is disposed on the first substrate and has a second through hole. The second through hole is connected to the first through hole and is located within the inner edge of the first through hole. The key circuit is disposed on one of the first substrate and the second substrate. The connector connects the second through hole and extends to the bottom surface of the second substrate facing the first substrate. The key assembly is located on the top surface of the second substrate facing away from the first substrate, connected to the connector, and configured to trigger the key circuit.

[0008] In one or more embodiments of the present invention, the second substrate is a printed circuit board.

[0009] In one or more embodiments of the present invention, the key circuit is disposed on the top surface of the second substrate.

[0010] In one or more embodiments of the present invention, the first substrate is a structural reinforcement plate.

[0011] In one or more embodiments of the present invention, the keyboard further comprises a light source, which is disposed on the top surface of the second substrate and configured to emit light toward the key assembly.

[0012] In one or more embodiments of the present invention, the first substrate is a printed circuit board.

[0013] In one or more embodiments of the present invention, the second substrate further has a hollow hole. The key circuit is disposed on the first substrate and is opposite to the key assembly through the hollow hole.

[0014] In one or more embodiments of the present invention, the second substrate further has a hollow hole. The keyboard further includes a light source. The light source is disposed on the first substrate, located in the hollow hole, and configured to emit light toward the key assembly.

[0015] In one or more embodiments of the present invention, the second substrate is a light guide plate having a hollow hole. The keyboard further comprises a light source. The light source is disposed on the first substrate, located in the hollow hole, and configured to emit light toward the inner edge of the hollow hole.

[0016] In one or more embodiments of the present invention, the keyboard further includes a reflective layer disposed between the first substrate and the second substrate.

[0017] In one or more embodiments of the present invention, the keyboard further comprises a shielding layer. The shielding layer is disposed on the top surface of the second substrate.

[0018] In one or more embodiments of the present invention, the second through hole is a non-circular hole, and the connecting member is embedded in the second through hole.

[0019] In one or more embodiments of the present invention, the connecting member includes a snap-fit ​​portion. The snap-fit ​​portion is located in the first through hole. On a cross section passing through the first through hole and the second through hole, the snap-fit ​​portion has a width smaller than the width of the first through hole and larger than the width of the second through hole.

[0020] In one or more embodiments of the present invention, the connecting member includes an extension portion, a clamping portion, and a connecting portion. The extension portion is connected to the second through hole. The clamping portion extends from the extension portion to the bottom surface of the second substrate. The connecting portion extends from the extension portion to the top surface of the second substrate and is connected to the key assembly. The second substrate is partially limited between the clamping portion and the connecting portion.

[0021] In one or more embodiments of the present invention, the first substrate and the second substrate are two printed circuit boards.

[0022] In summary, the keyboard of the present invention adopts a stacked structure of double-layer substrates, one of which is a printed circuit board. The present invention arranges the key circuit on the printed circuit board so that the key circuit is supported by the structure of the double-layer substrate at the same time. Therefore, not only does the key circuit have a higher product reliability, but the double-layer substrate can also effectively replace the existing metal base plate used to support the flexible circuit board. The keyboard of the present invention also utilizes a connector arranged on one of the double-layer substrates to connect with the key assembly to replace the existing hook on the metal base plate. In some embodiments where the connector is made of plastic by injection molding or hot melt, since its manufacturing accuracy is significantly higher than the processing accuracy of the stamping process for manufacturing the hook on the existing metal base plate, the assembly tolerance between the connector of the present invention and the key assembly can be simply controlled by the manufacturing accuracy of the connector itself, which can not only improve the assembly precision of the keyboard of the present invention, but also avoid the generation of metal knocking noise during operation. Furthermore, the connector is fixed to the upper layer of the double-layer substrate, and the lower layer of the double-layer substrate has a correspondingly larger avoidance hole for accommodating the connector, thereby effectively preventing the connector from protruding from the bottom of the double-layer substrate, so that the double-layer substrate has a flat bottom. Furthermore, through the stacking structure of the double-layer substrate, the problem of bending and deformation of the printed circuit board that may be caused by the temperature during the injection molding or hot melt process can also be effectively improved.

[0023] The above description is only used to illustrate the problems to be solved by the present invention, the technical means to solve the problems, and the effects produced, etc. The specific details of the present invention will be introduced in detail in the following implementation methods and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the above and other objects, features, advantages and embodiments of the present invention more clearly understood, the accompanying drawings are described as follows:

[0025] Figure 1 FIG. 1 is a three-dimensional diagram of a keyboard according to an embodiment of the present invention.

[0026] Figure 2A A partial three-dimensional view of a key device according to an embodiment of the present invention is shown, wherein the key cap is separated upward.

[0027] Figure 2B To illustrate Figure 2A A three-dimensional exploded view of the button device in .

[0028] Figure 3A To illustrate Figure 2A The illustrated schematic cross-sectional view of the key device after assembly along line segment 3A-3A.

[0029] Figure 3B To illustrate Figure 2A The illustrated schematic cross-sectional view of the key device after assembly along line segment 3B-3B.

[0030] Figure 4 FIG. 1 is a partial top view of a key circuit according to an embodiment of the present invention.

[0031] Figure 5 FIG. 4 is a cross-sectional schematic diagram illustrating some components of a key device according to another embodiment of the present invention.

[0032] Figure 6 FIG. 4 is a cross-sectional schematic diagram illustrating some components of a key device according to another embodiment of the present invention.

[0033] Figure 7 FIG. 4 is a cross-sectional schematic diagram illustrating some components of a key device according to another embodiment of the present invention.

[0034] Figure 8 FIG. 4 is a cross-sectional schematic diagram illustrating some components of a key device according to another embodiment of the present invention.

[0035] The accompanying drawings are denoted as follows:

[0036] 100: Keyboard

[0037] 110, 210, 310, 410, 510: first substrate

[0038] 111: First through hole

[0039] 120, 220, 320, 420, 520: Second substrate

[0040] 121: Bottom

[0041] 122: Top

[0042] 123: Second through hole

[0043] 130: Connectors

[0044] 131: Extension

[0045] 132: snap-fit ​​part

[0046] 133: Connection

[0047] 140: Button assembly

[0048] 141: Guidance structure

[0049] 142: Keycaps

[0050] 143: Reset

[0051] 143a: Trigger

[0052] 150: Button circuit

[0053] 151: First switch pad

[0054] 152: Second switch pad

[0055] 160: Light source

[0056] 224, 324, 424a, 424b, 524a, 524b: Hollow holes

[0057] 570: Reflective layer

[0058] 580: Shielding layer

[0059] P: Orthographic projection

[0060] W1, W2, W3: Width DETAILED DESCRIPTION

[0061] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in the drawings in a simple schematic manner, and the same components in different embodiments are marked with the same component symbols.

[0062] Please refer to Figure 1 , Figure 2A as well as Figure 2B . Figure 1 FIG. 1 is a perspective view of a keyboard 100 according to an embodiment of the present invention. Figure 2A FIG. 1 is a partial three-dimensional view of a key device according to an embodiment of the present invention, wherein the key cap 142 is separated upward. Figure 2B To illustrate Figure 2A 3D exploded view of the key device in FIG. Figures 1 to 2B As shown, the keyboard 100 of this embodiment can be an external keyboard for a desktop computer (for example, a keyboard with a PS2 interface or a keyboard with a USB interface) or an input device in the form of a key (for example, a touchpad on a laptop), but is not limited to this. In other words, the concept of the keyboard 100 of the present invention can be applied to any electronic product that uses pressing as an input method. In this embodiment, the keyboard 100 includes a first substrate 110, a second substrate 120, and a plurality of key components 140 (only one is represented). The structure, function, and connection relationship between the components included in the keyboard 100 will be described in detail below.

[0063] like Figure 2A and Figure 2B As shown, in this embodiment, the keyboard 100 further includes a key circuit 150 (see Figure 3A ) and a plurality of connectors 130 (only one is representatively indicated), wherein the combination of the first substrate 110, the second substrate 120, the key circuit 150, the four connectors 130 and a key assembly 140 can be regarded as a single key device. The second substrate 120 is disposed on the first substrate 110, and the second substrate 120 is a printed circuit board, and the first substrate 110 can be used as a reinforcement plate for the second substrate 120. The key circuit 150 is disposed on the second substrate 120. In some embodiments, the second substrate 120 is bonded to the first substrate 110, but the present invention is not limited thereto. In some embodiments, the material of the first substrate 110 includes metal, plastic or a combination thereof, but the present invention is not limited thereto. In some embodiments in which the material of the first substrate 110 includes metal, the metal can be stainless steel (SUS) or hot-dip galvanized steel (KU400), which has the advantages of high temperature resistance, high strength and good heat dissipation effect.

[0064] In this embodiment, the connecting member 130 is disposed on the second substrate 120. Specifically, the material of the connecting member 130 includes plastic, and can be manufactured by injection molding or hot melting.

[0065] In this embodiment, the key assembly 140 is disposed on the second substrate 120 and includes a guide structure 141, a keycap 142 and a reset member 143. The keycap 142 is located above the second substrate 120. The guide structure 141 is connected between the connecting member 130 and the keycap 142 and is formed by two connecting rods pivotally connected to guide the keycap 142 to move up and down toward and away from the second substrate 120. The reset member 143 is disposed on the second substrate 120, between the second substrate 120 and the keycap 142, and above the key circuit 150. When the keycap 142 is pressed down by an external force, the reset member 143 will generate a resistance force on the keycap 142, thereby providing the user with a pressing feel. When the external force applied to the keycap 142 is released, the reset member 143 can provide a restoring force for the pressed keycap 142 to return to the original unpressed position. In this embodiment, the restoring member 143 may be an elastic member, such as a rubber dome, a metal dome or a spring.

[0066] In practical applications, the guide structure 141 can also be replaced by other connecting structures with similar functions (i.e., driving the keycap 142 to move up and down relative to the base plate), such as a V-shaped, A-shaped or two parallel connecting rod structures. The reset member 143 can also be replaced by other components with similar functions, such as a magnetic component.

[0067] Please refer to Figure 3A as well as Figure 4 . Figure 3ATo illustrate Figure 2A The illustrated schematic cross-sectional view of the key device after assembly along line segment 3A-3A. Figure 4 FIG. 1 is a partial top view of a key circuit 150 according to an embodiment of the present invention. Figure 3A and Figure 4 As shown, in this embodiment, the key circuit 150 is disposed on the top surface 122 of the second substrate 120 and includes a first switch pad 151 and a second switch pad 152. The second switch pad 152 is separated from the first switch pad 151, and both have a plurality of extended branches and are arranged alternately. Figure 3A As shown, the reset member 143 is substantially cup-shaped and has a trigger portion 143a therein. The trigger portion 143a comprises a conductive material. When the key cap 142 is pressed downward by an external force, the reset member 143 is simultaneously squeezed and deformed by the key cap 142, so that the trigger portion 143a moves downward and contacts the first switch pad 151 and the second switch pad 152. The orthographic projection P( Figure 4 The first switch pad 151 and the second switch pad 152 are at least partially overlapped with each other.

[0068] As can be seen from the above structural configuration, the keyboard 100 of this embodiment adopts a stacking structure of double-layer substrates, wherein the second substrate 120 is a printed circuit board. By setting the key circuit 150 on the second substrate 120, the key circuit 150 is supported by the structure of the double-layer substrate at the same time. Therefore, not only does the key circuit 150 have a higher product reliability, but the double-layer substrate can also effectively replace the existing metal base plate used to support the flexible circuit board. In addition, the keyboard 100 of this embodiment also uses the connector 130 set on the second substrate 120 to connect with the key assembly 140 to replace the hook on the existing metal base plate. Since the connector 130 contains plastic and can be manufactured by injection molding or hot melting processes, its manufacturing accuracy is significantly higher than the processing accuracy of the stamping process for manufacturing the hook on the existing metal base plate. In this way, the assembly tolerance between the connector 130 and the key assembly 140 can be simply controlled by the manufacturing accuracy of the connector 130 itself, which can not only improve the assembly precision of the keyboard 100 of this embodiment, but also avoid the metal knocking noise during operation.

[0069] Please refer to Figure 3B , which is a drawing Figure 2A The schematic cross-sectional view of the key device assembly along line 3B-3B is shown. Figure 3BAs shown, in this embodiment, the first substrate 110 has a first through hole 111. The second substrate 120 has a second through hole 123. The second through hole 123 is connected to the first through hole 111 and is located within the inner edge of the first through hole 111. The connecting member 130 connects with the second through hole 123 and extends to the bottom surface 121 of the second substrate 120 facing the first substrate 110. Specifically, the connecting member 130 includes an extension portion 131 and a clamping portion 132. The extension portion 131 connects with the second through hole 123. Figure 2B As shown in FIG. 1 , the second through hole 123 is a non-circular hole. The extension portion 131 of the connecting member 130 is engaged with the second through hole 123 to prevent the connecting member 130 from rotating relative to the second substrate 120. In practical applications, the second through hole 123 can also be modified to a polygon of other specific shapes. The engaging portion 132 extends from the extension portion 131 to the bottom surface 121 of the second substrate 120. In a cross section (i.e., as shown in FIG. 1 ) passing through the first through hole 111 and the second through hole 123, Figure 3B ), the width W1 of the engaging portion 132 is smaller than the width W2 of the first through hole 111, and larger than the width W3 of the second through hole 123. As can be seen from the structural configuration, the connecting member 130 is fixed to the second through hole 123 of the second substrate 120, and the first substrate 110 has a correspondingly larger avoidance hole (i.e., the first through hole 111) for accommodating the connecting member 130, thereby effectively preventing the connecting member 130 from protruding from the bottom of the first substrate 110, so that the first substrate 110 has a flat bottom.

[0070] In addition, if Figure 3B As shown, in this embodiment, the connector 130 further has a connecting portion 133. The connecting portion 133 extends from the extending portion 131 to the top surface 122 of the second substrate 120 and is connected to the key assembly 140. The second substrate 120 is partially limited between the engaging portion 132 and the connecting portion 133. With this structural configuration, the connector 130 can be more firmly fixed on the second substrate 120 and is not easy to fall off.

[0071] In addition, if FIG. 2A to FIG. 3B As shown, in this embodiment, the keyboard 100 further includes a light source 160. The light source 160 is disposed on the top surface 122 of the second substrate 120 and is configured to emit light toward the key assembly 140 (i.e., emit light upward). It can be seen that the key circuit 150 and the light source 160 in this embodiment are both disposed on the second substrate 120, but the present invention is not limited thereto.

[0072] Please refer to Figure 5 , which is a cross-sectional schematic diagram illustrating some components of a key device according to another embodiment of the present invention. The key device of this embodiment includes the same Figure 2BThe key circuit 150, the connecting member 130, the key assembly 140 and the light source 160 are shown, so the description of these components can refer to the above-mentioned relevant paragraphs, and will not be repeated here. The connecting member 130 and the key assembly 140 are omitted and not shown. Figure 2B The key device of this embodiment provides a first substrate 210 and a second substrate 220 that are replaced. Specifically, the first substrate 210 and the second substrate 220 of this embodiment are both printed circuit boards, wherein the key circuit 150 is disposed on the first substrate 210, and the light source 160 is disposed on the second substrate 220. The first substrate 210 and the second substrate 220 have the same or similar Figure 3B In addition to the first through hole 111 and the second through hole 123 shown, the second substrate 220 also has a corresponding hollow hole 224 to expose the key circuit 150 disposed on the first substrate 210 (that is, the key circuit 150 is opposite to the key assembly 140 through the hollow hole 224), so that the trigger portion 143a moves downward through the hollow portion to trigger the key circuit 150.

[0073] Please refer to Figure 6 , which is a cross-sectional schematic diagram illustrating some components of a key device according to another embodiment of the present invention. The key device of this embodiment includes the same Figure 2B The key circuit 150, the connecting member 130, the key assembly 140 and the light source 160 are shown, so the description of these components can refer to the above-mentioned relevant paragraphs, and will not be repeated here. The connecting member 130 and the key assembly 140 are omitted and not shown. Figure 2B The key device of this embodiment provides an alternative first substrate 310 and a second substrate 320. Specifically, the first substrate 310 and the second substrate 320 of this embodiment are both printed circuit boards, wherein the key circuit 150 is disposed on the second substrate 320, and the light source 160 is disposed on the first substrate 310. The first substrate 310 and the second substrate 320 have the same or similar Figure 3B In addition to the first through hole 111 and the second through hole 123 shown, the second substrate 320 also has a corresponding hollow hole 324 to expose the light source 160 disposed on the first substrate 310 (that is, the light source 160 is located in the hollow hole 324), so that the light emitted by the light source 160 passes through the hollow portion and irradiates the key assembly 140 above the second substrate 320. In addition, since the light source 160 is accommodated in the hollow hole 324 of the second substrate 320 and does not protrude from the surface of the second substrate 320 away from the first substrate 310, structural interference with the key assembly 140 above can be avoided, and the flexibility of adjusting the setting position of the light source 160 can be increased.

[0074] Please refer to Figure 7, which is a cross-sectional schematic diagram illustrating some components of a key device according to another embodiment of the present invention. The key device of this embodiment includes the same Figure 2B The key circuit 150, the connecting member 130, the key assembly 140 and the light source 160 are shown, so the description of these components can refer to the above-mentioned relevant paragraphs, and will not be repeated here. The connecting member 130 and the key assembly 140 are omitted and not shown. Figure 2B The key device of this embodiment provides a first substrate 410 and a second substrate 420. Specifically, the first substrate 410 of this embodiment is a printed circuit board, and the second substrate 420 is a reinforcement board, wherein the key circuit 150 and the light source 160 are both disposed on the first substrate 410. The first substrate 410 and the second substrate 420 have the same or similar Figure 3B In addition to the first through hole 111 and the second through hole 123, the second substrate 420 also has hollow holes 424a and 424b correspondingly. The hollow hole 424a is configured to expose the key circuit 150 disposed on the first substrate 410 (that is, the key circuit 150 is opposite to the key assembly 140 through the hollow hole 424a), so that the triggering portion 143a moves downward through the hollow portion to trigger the key circuit 150. The hollow hole 424b is configured to expose the light source 160 disposed on the first substrate 410 (that is, the light source 160 is located in the hollow hole 424b), so that the light emitted by the light source 160 passes through the hollow portion and irradiates the key assembly 140 above the second substrate 420.

[0075] Please refer to Figure 8 , which is a cross-sectional schematic diagram illustrating some components of a key device according to another embodiment of the present invention. The key device of this embodiment includes the same Figure 2B The key circuit 150, the connecting member 130, the key assembly 140 and the light source 160 are shown, so the description of these components can refer to the above-mentioned relevant paragraphs, and will not be repeated here. The connecting member 130 and the key assembly 140 are omitted and not shown. Figure 2B The key device shown in the embodiment provides a first substrate 510 and a second substrate 520 that are replaced. Specifically, the first substrate 510 in the embodiment is a printed circuit board, and the second substrate 520 is a light guide plate, wherein the key circuit 150 and the light source 160 are both disposed on the first substrate 510. In some embodiments, the material of the second substrate 520 includes polycarbonate (PC), but the present invention is not limited thereto. The first substrate 510 and the second substrate 520 have the same or similar Figure 3BIn addition to the first through hole 111 and the second through hole 123, the second substrate 520 also has corresponding hollow holes 524a and 524b. The hollow hole 524a is configured to expose the key circuit 150 disposed on the first substrate 510 (that is, the key circuit 150 is opposite to the key assembly 140 through the hollow hole 524a), so that the trigger portion 143a moves downward through the hollow portion to trigger the key circuit 150. The hollow hole 524b is configured to expose the light source 160 disposed on the first substrate 510 (that is, the light source 160 is located in the hollow hole 524b), so that the light source 160 emits light toward the inner edge of the hollow portion (that is, emits light laterally), thereby allowing the light to enter the second substrate 520. The second substrate 520 is configured to uniformly guide the light propagating therein, and allow the light to leave from its surface away from the first substrate 510 and reach the key assembly 140 above. Compared with the aforementioned other embodiments, since the second substrate 520 of the key device of this embodiment adopts a light guide plate, multiple key devices can share the same light source 160, thereby reducing component costs.

[0076] In some embodiments, Figure 8 As shown, in order to increase the light emitting effect of the second substrate 520, a reflective layer 570 can be further arranged between the first substrate 510 and the second substrate 520, so that the light propagating in the second substrate 520 is reflected by the reflective layer 570 and leaves from the surface of the second substrate 520 away from the first substrate 510, and the light loss problem caused by the light being absorbed by the first substrate 510 is effectively solved.

[0077] In some embodiments, Figure 8 As shown, a shielding layer 580 can be further provided on the top surface of the second substrate 520 (i.e., the surface of the second substrate 520 away from the first substrate 510), so that light can leave the predetermined area on the top surface of the second substrate 520 where the shielding layer 580 is not provided and reach the key assembly 140 above, thereby making more efficient use of the light emitted by the light source 160.

[0078] From the above detailed description of the specific embodiments of the present invention, it can be clearly seen that the keyboard of the present invention adopts a stacking structure of double-layer substrates, one of which is a printed circuit board. The present invention arranges the key circuit on the printed circuit board so that the key circuit is supported by the structure of the double-layer substrate at the same time. Therefore, not only does the key circuit have a higher product reliability, but the double-layer substrate can also effectively replace the existing metal base plate used to support the flexible circuit board. The keyboard of the present invention also uses a connector arranged on one of the double-layer substrates to connect with the key assembly to replace the hook on the existing metal base plate. In some embodiments where the connector is made of plastic by injection molding or hot melt, since its manufacturing accuracy is significantly higher than the processing accuracy of the stamping process for manufacturing the hook on the existing metal base plate, the assembly tolerance between the connector of the present invention and the key assembly can be simply controlled by the manufacturing accuracy of the connector itself, which can not only improve the assembly precision of the keyboard of the present invention, but also avoid the generation of metal knocking noise during operation. Furthermore, the connector is fixed to the upper layer of the double-layer substrate, and the lower layer of the double-layer substrate has a correspondingly larger avoidance hole for accommodating the connector, thereby effectively preventing the connector from protruding from the bottom of the double-layer substrate, so that the double-layer substrate has a flat bottom. Furthermore, through the stacking structure of the double-layer substrate, the problem of bending and deformation of the printed circuit board that may be caused by the temperature during the injection molding or hot melt process can also be effectively improved.

[0079] Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the appended claims.

Claims

1. A keyboard, characterized in that: Include: A first substrate having a first through hole; a second substrate, the second substrate being bonded to the first substrate and having a second through hole, wherein the second through hole is connected to the first through hole and is located within an inner edge of the first through hole; A key circuit is disposed on one of the first substrate and the second substrate; a connecting member connected to the second through hole and extending to a bottom surface of the second substrate facing the first substrate; and A key assembly, located on a top surface of the second substrate facing away from the first substrate, connected to the connecting member, and configured to trigger the key circuit; The second through hole is a non-circular hole to prevent the connecting member from rotating relative to the second substrate: The connecting piece includes: An extension portion connected to the second through hole; a locking portion extending from the extending portion to the bottom surface of the second substrate; and A connecting portion extends from the extending portion to the top surface of the second substrate and is connected to the key assembly, wherein the second substrate is partially limited between the engaging portion and the connecting portion.

2. The keyboard according to claim 1, wherein: The second substrate is a printed circuit board.

3. The keyboard according to claim 2, characterized in that The key circuit is arranged on the top surface of the second substrate.

4. The keyboard according to claim 2, wherein: The first substrate is a structural reinforcement plate.

5. The keyboard according to claim 2, wherein: A light source is included, which is arranged on the top surface of the second substrate and configured to emit light toward the key assembly.

6. The keyboard according to claim 1, wherein: The first substrate is a printed circuit board.

7. The keyboard according to claim 6, wherein: The second substrate also has a hollow hole. The key circuit is arranged on the first substrate and is opposite to the key assembly via the hollow hole.

8. The keyboard according to claim 6, wherein: The second substrate also has a hollow hole. The keyboard includes a light source, which is arranged on the first substrate, located in the hollow hole, and configured to emit light toward the key assembly.

9. The keyboard according to claim 6, wherein: The second substrate is a light guide plate and has a hollow hole. The keyboard includes a light source, which is arranged on the first substrate, located in the hollow hole, and configured to emit light toward the inner edge of the hollow hole.

10. The keyboard according to claim 9, wherein: The invention comprises a reflective layer which is arranged between the first substrate and the second substrate.

11. The keyboard according to claim 9, wherein: A shielding layer is included and is disposed on the top surface of the second substrate.

12. The keyboard according to claim 1, wherein: The connecting member includes a clamping portion, which is located in the first through hole. On a cross section passing through the first through hole and the second through hole, the width of the clamping portion is smaller than the width of the first through hole and larger than the width of the second through hole.

13. The keyboard according to claim 1, wherein: The first substrate and the second substrate are two printed circuit boards respectively.

14. A keyboard, characterized in that: Include: A first substrate having a first through hole, wherein the first substrate is a printed circuit board; a second substrate, the second substrate being bonded to the first substrate and having a second through hole, wherein the second through hole is connected to the first through hole and is located within an inner edge of the first through hole; A key circuit is disposed on one of the first substrate and the second substrate; a connecting member connected to the second through hole and extending to a bottom surface of the second substrate facing the first substrate; and A key assembly, located on a top surface of the second substrate facing away from the first substrate, connected to the connecting member, and configured to trigger the key circuit; The connecting piece includes: An extension portion connected to the second through hole; a locking portion extending from the extending portion to the bottom surface of the second substrate; and A connecting portion extending from the extending portion to the top surface of the second substrate and connected to the key assembly, wherein the second substrate is partially limited between the engaging portion and the connecting portion; The second through hole is a non-circular hole to prevent the connecting member from rotating relative to the second substrate.

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