keyboard

Abstract

The present application provides a keyboard, which includes a backlight module, a bottom plate, a film circuit and a plurality of key structures. The backlight module includes a reflection layer, a light guide layer and a light shielding layer. The light guide layer is disposed on the reflection layer, and the light shielding layer is disposed on the light guide layer. The light guide layer is located between the light shielding layer and the reflection layer. The light guide layer has a perforation, and the light shielding layer and the reflection layer are in contact within the perforation of the light guide layer. The bottom plate is disposed on the light shielding layer. The film circuit is disposed on the bottom plate. The bottom plate has a positioning part corresponding to the perforation of the light guide layer, and the positioning part is protruded to the reflection layer or the film circuit. The plurality of key structures are disposed on the film circuit.

Description

Technical Field

[0001] This invention relates to a keyboard, and more particularly to an illuminated keyboard. Background Technology

[0002] Keyboards are a common physical input interface and a standard feature of laptops. As users' demands for a superior user experience continue to rise, backlit keyboards have emerged to enhance the visual experience. However, light emitted from the backlight module can easily leak out through openings or gaps in the keyboard mechanism, causing light leakage and affecting the user experience. Furthermore, balancing the need for a thin and light design with the assembly reliability and structural integration of backlit keyboards has always been a crucial issue for manufacturers. Summary of the Invention

[0003] This invention proposes a keyboard that not only helps to improve light leakage or uneven light effect, but also helps to improve assembly reliability and mechanical integration.

[0004] According to one embodiment of the present invention, the keyboard includes a backlight module, a base plate, a thin-film circuit, and multiple key structures. The backlight module includes a light source, a reflective layer, a light guide layer, and a light-shielding layer, wherein the light guide layer is disposed on the reflective layer, and the light-shielding layer is disposed on the light guide layer. The light source is disposed corresponding to the light guide layer, and the light guide layer is located between the light-shielding layer and the reflective layer. The light guide layer has perforations, and the light-shielding layer and the reflective layer are in contact within the perforations of the light guide layer. The base plate is disposed on the light-shielding layer. The thin-film circuit is disposed on the base plate, wherein the base plate has positioning portions corresponding to the perforations of the light guide layer, and the positioning portions protrude toward the reflective layer or the thin-film circuit. The multiple key structures are disposed on the thin-film circuit.

[0005] In a keyboard according to an embodiment of the present invention, the positioning portion of the base plate protrudes toward the reflective layer and extends into the perforation of the light guide layer to contact the reflective layer or the light shielding layer.

[0006] In a keyboard according to an embodiment of the present invention, both the light-shielding layer and the reflective layer have openings that partially overlap with the perforations of the light-guiding layer, and the positioning portion of the base plate passes through the openings of the light-shielding layer and the reflective layer.

[0007] In a keyboard according to an embodiment of the present invention, the positioning portion includes a base portion and a fixing portion engaged with the base portion, wherein the base portion contacts a reflective layer or a light-shielding layer, and the fixing portion penetrates the reflective layer.

[0008] In a keyboard according to an embodiment of the present invention, the light-shielding layer has a light-shielding extension extending into a perforation of the light-guiding layer. The light-shielding extension covers the inner wall surface of the perforation of the light-guiding layer and contacts the reflective layer.

[0009] In a keyboard according to an embodiment of the present invention, the reflective layer has a reflective extension extending into a perforation of the light guide layer. The reflective extension covers the inner wall surface of the perforation of the light guide layer and contacts the light-shielding layer.

[0010] In a keyboard according to an embodiment of the present invention, the positioning portion of the base plate protrudes toward the thin-film circuit. The reflective layer has a reflective extension extending into a perforation of the light guide layer. The reflective extension covers the inner wall surface of the perforation of the light guide layer and contacts the light-shielding layer.

[0011] In a keyboard according to an embodiment of the present invention, a fixing member is further included, which is fixed to the positioning portion. The reflective extension of the reflective layer extends further out of the perforation of the light guide layer and passes through the light shielding layer to contact the positioning portion, and the fixing member passes through the reflective extension of the reflective layer, the positioning portion, and the thin film circuit.

[0012] In a keyboard according to an embodiment of the present invention, a fixing member is further included, which is fixed to the positioning portion. The light-shielding layer has a light-shielding extension convex to the thin-film circuit, wherein the light-shielding extension contacts the positioning portion, and the fixing member passes through the light-shielding extension, the positioning portion, and the thin-film circuit of the light-shielding layer.

[0013] In a keyboard according to an embodiment of the present invention, a fixing member fixed to the positioning part and a frame disposed on the membrane circuit are further included. The fixing member passes through the positioning part and the membrane circuit and is locked into the frame.

[0014] In a keyboard according to an embodiment of the present invention, the thin-film circuit has an opening facing the positioning portion to accommodate the positioning portion.

[0015] According to another embodiment of the present invention, the keyboard includes a backlight module, a base plate, a thin-film circuit, and a plurality of key structures. The backlight module includes a light source, a reflective layer, a light guide layer, and a light-shielding layer, wherein the light guide layer is disposed on the reflective layer, and the light-shielding layer is disposed on the light guide layer. The light source is disposed corresponding to the light guide layer, and the light guide layer is located between the light-shielding layer and the reflective layer. The light guide layer has perforations, and the light-shielding layer and the reflective layer are in contact within the perforations of the light guide layer. The base plate is disposed on the light-shielding layer. The base plate has positioning portions corresponding to the perforations of the light guide layer, and the light-shielding layer and the reflective layer cover at least a portion of the positioning portions. The thin-film circuit is disposed on the base plate. The plurality of key structures are disposed on the thin-film circuit.

[0016] According to another embodiment of the present invention, the keyboard includes a backlight module, a base plate, a thin-film circuit, and multiple key structures. The backlight module includes a light source, a reflective layer, a light guide layer, and a light-shielding layer, wherein the light guide layer is disposed on the reflective layer, and the light-shielding layer is disposed on the light guide layer. The light source is disposed corresponding to the light guide layer, and the light guide layer is located between the light-shielding layer and the reflective layer. The light guide layer has perforations, and the light-shielding layer and the reflective layer are in contact within the perforations of the light guide layer. The base plate is disposed on the light-shielding layer. The thin-film circuit is disposed on the base plate, wherein the base plate has a positioning portion disposed corresponding to the perforations of the light guide layer, and the positioning portion protrudes towards the thin-film circuit. The positioning portion has a recess facing the backlight module. The multiple key structures are disposed on the thin-film circuit.

[0017] In another embodiment of the keyboard according to the present invention, a fixing member is further included, which is fixed to the positioning portion. The reflective extension of the reflective layer extends further out of the perforation of the light guide layer and through the light shielding layer to extend into the recess of the positioning portion, and the fixing member passes through the reflective extension of the reflective layer, the positioning portion and the thin film circuit.

[0018] In another embodiment of the keyboard according to the present invention, a fixing member is further included, which is fixed to the positioning portion. The light-shielding layer has a light-shielding extension protruding toward the thin-film circuit, wherein the light-shielding extension extends into the recess of the positioning portion, and the fixing member passes through the light-shielding extension, the positioning portion, and the thin-film circuit of the light-shielding layer.

[0019] Based on the above, in the keyboard of the present invention, the base plate has a positioning part for fixing the fixing member, so as to improve the assembly reliability and structural integration of the keyboard while meeting the design requirements of thinness and lightness. In addition, the positioning part of the base plate is provided corresponding to the perforation of the light guide layer, and the light shielding layer and the reflective layer are in contact within the perforation of the light guide layer, so as to block the transmission path of light from the perforation of the light guide layer to the positioning part of the base plate, prevent light from shining outward from the gap between the fixing member and the backlight module, and thus improve the phenomenon of light leakage or uneven light effect. Attached Figure Description

[0020] Figure 1 This is a top view of a keyboard according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 A partial cross-sectional view of the keyboard along section line II;

[0022] Figure 3 yes Figure 1 A diagram showing the keyboard from below;

[0023] Figure 4 yes Figure 3 A three-dimensional schematic diagram of region A;

[0024] Figure 5 yes Figure 1 A three-dimensional schematic diagram of region B;

[0025] Figure 6 This is a partial cross-sectional schematic diagram of a keyboard according to another embodiment of the present invention;

[0026] Figure 7 This is a partial cross-sectional schematic diagram of a keyboard according to another embodiment of the present invention;

[0027] Figure 8 This is a partial cross-sectional schematic diagram of a keyboard according to another embodiment of the present invention;

[0028] Figure 9 This is a partial cross-sectional schematic diagram of a keyboard according to a further embodiment of the present invention. Detailed Implementation

[0029] Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same element references are used in the drawings and description to denote the same or similar parts.

[0030] Figure 1 This is a top view schematic diagram of a keyboard according to an embodiment of the present invention. Figure 2 yes Figure 1 A partial cross-sectional view of the keyboard along section II. Please refer to... Figure 1 and Figure 2 In this embodiment, the keyboard 100 may be an illuminated keyboard and is suitable for integration into a laptop computer or application in other electronic devices. Specifically, the keyboard 100 includes a backlight module 110, a base plate 120, a membrane circuit 130, and multiple key structures 140. The base plate 120 is disposed on the backlight module 110, and the membrane circuit 130 is disposed on the base plate 120. Furthermore, the multiple key structures 140 are disposed on the membrane circuit 130, and each key structure 140 includes a keycap 141, a support structure 142, and an elastic body 143. The support structure 142 and the elastic body 143 are disposed between the keycap 141 and the membrane circuit 130, and the keycap 141 can be supported and assisted by the support structure 142 and the elastic body 143 to move up and down above the membrane circuit 130. The support structure 142 connecting the keycap 141 and the base plate 120 may be a scissor-switch structure or other linkage structure, while the elastic body 143 may be a rubber dome switch or a metal dome switch.

[0031] like Figure 2As shown, the backlight module 110 includes a light source 111, a reflective layer 112, a light guide layer 113, and a light-shielding layer 114. The light guide layer 113 is disposed on the reflective layer 112, and the light-shielding layer 114 is disposed on the light guide layer 113. The light source 111 is disposed corresponding to the light guide layer 113, and the light guide layer 113 is located between the light-shielding layer 114 and the reflective layer 112. The light source 111 can be a light-emitting diode or other suitable light-emitting components, and the light emitted by the light source 111 is suitable for being guided to the keycap 141 via the light guide layer 113. Generally, the light-shielding layer 114, the base plate 120, and the thin film circuit 130 all have light-passing sections, wherein the light-passing sections of the light-shielding layer 114, the base plate 120, and the thin film circuit 130 are arranged correspondingly to each other (but not limited to complete overlap) and fall within the orthographic projection range of the keycap 141, so that light can be directed from the light guide layer 113 through the light-passing sections of the light-shielding layer 114, the base plate 120, and the thin film circuit 130 to the keycap 141.

[0032] In this embodiment, the light guide layer 113 has a perforation 113a, and the light shielding layer 114 and the reflective layer 112 are in contact within the perforation 113a of the light guide layer 113. A base plate 120 is disposed on the light shielding layer 114, and a thin-film circuit 130 is disposed on the base plate 120. The base plate 120 has a positioning portion 121 corresponding to the perforation 113a of the light guide layer 113, wherein the positioning portion 121 protrudes towards the reflective layer 112. In one embodiment, a fastener 150 (e.g., a screw, a hot-melt pin, or a snap-fit) can be fixed in the positioning portion 121, allowing the keyboard 100 to be assembled into a laptop computer or other electronic device, thereby improving the assembly reliability and structural integration of the keyboard 100 while meeting the requirements for a thin and light design. On the other hand, the thin-film circuit 130 has an opening 131 facing the positioning portion 121 to accommodate at least a portion of the positioning portion 121 and the end of the assembled fastener 150, thereby meeting the requirements for a thin and light design. In one embodiment, the opening 131 may be a blind hole to prevent the user's view from directly seeing the positioning portion 121 below the membrane circuit 130 from the outside of the key structure 140. For example, the membrane circuit 130 includes a multi-layer structure (not shown) stacked in the direction extending from the keycap 141 toward the base plate 120, such as an upper circuit layer, a spacer layer, and a lower circuit layer, and the spacer layer and the lower circuit layer at the corresponding opening 131 have perforations to prevent the positioning portion 121 from interfering with the membrane circuit 130 and damaging the circuit structure therein.

[0033] like Figure 2As shown, the positioning part 121 of the base plate 120 is located between two adjacent button structures 140. Since the light-shielding layer 114 and the reflective layer 112 are in contact within the perforation 113a of the light guide layer 113, the light-shielding layer 114 and the reflective layer 112 can block the transmission path of light from the perforation 113a of the light guide layer 113 to the positioning part 121 of the base plate 120, preventing light from shining outward from the gap between the positioning part 121 (or the fixing member 150) and the backlight module 110, thereby improving the phenomenon of light leakage or uneven light effect. Specifically, the light-shielding layer 114 has a light-shielding extension 114a extending into the perforation 113a of the light guide layer 113. The light-shielding extension 114a covers the inner wall surface of the perforation 113a of the light guide layer 113 and contacts the reflective layer 112. For example, the light-shielding extension 114a may or may not contact the inner wall surface of the perforation 113a and be adhered to the reflective layer 112. Therefore, the light-shielding extension 114a can block the transmission path of light from the inner wall surface of the perforation 113a of the light guide layer 113 to the positioning portion 121 of the base plate 120.

[0034] like Figure 2 As shown, the reflective layer 112 extends to one side of the perforation 113a of the light guide layer 113, and the light-shielding layer 114 turns into the perforation 113a of the light guide layer 113 and extends toward the reflective layer 112 to contact the reflective layer 112.

[0035] In this embodiment, the positioning portion 121 extends into the perforation 113a of the light guide layer 113 and contacts the reflective layer 112. Specifically, the positioning portion 121 includes a base portion 121a and a fixing portion 121b joined to the base portion 121a, wherein the base portion 121a contacts the reflective layer 112, and the fixing portion 121b penetrates the reflective layer 112. The base portion 121a is, for example, a recessed portion extending away from the keycap 141 by stamping the material of the base plate 120. The fixing portion 121b may be a screw post and has an opening 131 in the thin film circuit 130 for fixing the fastener 150 therein. More specifically, the light-shielding layer 114 has an opening 114b that partially overlaps with the through-hole 113a of the light-guiding layer 113, and the reflective layer 112 has an opening 112a that partially overlaps with the through-hole 113a of the light-guiding layer 113 and the opening 114b of the light-shielding layer 114. The opening 114b of the light-shielding layer 114 falls within the through-hole 113a of the light-guiding layer 113, wherein a portion of the reflective layer 112 is exposed within the opening 114b of the light-shielding layer 114, and the base portion 121a extends into the opening 114b of the light-shielding layer 114 to contact the reflective layer 112. Additionally, the fixing portion 121b passes through the opening 112a of the reflective layer 112. Since the positioning part 121 protrudes towards the reflective layer 112, and the junction of the body of the base plate 120 and the positioning part 121 has a recess 1201 corresponding to the perforation 113a of the light guide layer 113, the base part 121a covered by the reflective layer 112 can further prevent light leakage caused by light leaking from the bonding joint between the light shielding layer 114 and the reflective layer 112 being reflected by the recess 1201 and emitted from the gap between the base part 121a and the backlight module 110.

[0036] Figure 3 yes Figure 1 A diagram showing the keyboard from below. Figure 4 yes Figure 3 A 3D schematic diagram of region A. Please refer to... Figure 3 and Figure 4 The keyboard 100 also includes a flexible circuit board 160 connected to the backlight module 110, wherein the light source 111 (such as...) Figure 2 As shown, a flexible circuit board 160 is provided and electrically connected. The flexible circuit board 160 includes an electrical connection portion 161, a conductive terminal 162 disposed at the end of the electrical connection portion 161, and a pull tab 163 connecting the electrical connection portion 161. The pull tab 163 and the conductive terminal 162 are located on the same side of the electrical connection portion 161 to facilitate the operator to install and remove the electrical connection portion 161 via the pull tab 163. In addition, the flexible circuit board 160 also includes a reinforcing portion 164 protruding from one side of the electrical connection portion 161. The reinforcing portion 164 is disposed close to the conductive terminal 162, and the conductive terminal 162 and the reinforcing portion 164 are respectively located on opposite sides of the electrical connection portion 161. Furthermore, the reinforcing portion 164 can be used to improve the structural strength of the electrical connection portion 161 and reduce the probability of damage during installation and removal.

[0037] Figure 5 yes Figure 1 A 3D schematic diagram of region B. Please refer to... Figure 1 and Figure 5 The thin-film circuit 130 includes an electrical connection portion 132, a conductive terminal 133 disposed at the end of the electrical connection portion 132, and a pull tab 134 connecting the electrical connection portion 132. The pull tab 134 and the conductive terminal 133 are respectively located on opposite sides of the electrical connection portion 132 to facilitate the operator's installation and removal of the electrical connection portion 132 via the pull tab 134. Additionally, the thin-film circuit 130 includes a reinforcing portion 135 protruding from one side of the electrical connection portion 132. The reinforcing portion 135 is disposed close to the conductive terminal 133, and the conductive terminal 133 and the reinforcing portion 135 are respectively located on opposite sides of the electrical connection portion 132. Furthermore, the pull tab 134 may extend from the reinforcing portion 135. Further, the reinforcing portion 135 can be used to improve the structural strength of the electrical connection portion 132 and reduce the probability of damage during installation and removal.

[0038] Figure 6 This is a partial cross-sectional view of a keyboard according to another embodiment of the present invention. Please refer to... Figure 6 The keyboard 100A in this embodiment and Figure 2 The keyboards 100 shown are generally similar in design, with the main difference being that in the keyboard 100A of this embodiment, the base portion 121a of the positioning portion 121 does not contact the reflective layer 112, but instead contacts the light-shielding extension portion 114a of the light-shielding layer 114. In this way, by covering part of the base portion 121a with the light-shielding layer 114 (light-shielding extension portion 114a), light leakage caused by reflection from the base plate 120 through the attachment of the light-shielding layer 114 and the reflective layer 112 can be further prevented.

[0039] Figure 7 This is a partial cross-sectional schematic diagram of a keyboard according to another embodiment of the present invention. Please refer to... Figure 7 The keyboard 100B in this embodiment and Figure 2 The keyboards 100 shown are generally similar in design, with the main difference being that in the keyboard 100B of this embodiment, the reflective layer 112 has a reflective extension 112b extending into the perforation 113a of the light guide layer 113. The reflective extension 112b covers the inner wall surface of the perforation 113a of the light guide layer 113 and contacts the light shielding layer 114, for example, the reflective extension 112b is glued to the light shielding layer 114. Therefore, the reflective extension 112b can block the transmission path of light from the inner wall surface of the perforation 113a of the light guide layer 113 to the positioning portion 121' of the base plate 120.

[0040] like Figure 7As shown, the light-shielding layer 114 extends to one side of the perforation 113a of the light-guiding layer 113, and the reflective layer 112 turns into the perforation 113a of the light-guiding layer 113 and extends towards the light-shielding layer 114 to contact the light-shielding layer 114. On the other hand, the positioning part 121' in this embodiment includes a connecting piece 122 and a fixing part 121b engaged with the connecting piece 122. The connecting piece 122 is, for example, a metal gasket with holes, and one end of the fixing part 121b is provided in the hole of the connecting piece 122 and extends downward toward the connecting piece 122. The connecting piece 122 can be fastened to the body of the base plate 120 by riveting or welding, thereby connecting the positioning part 121' to the lower surface of the body of the base plate 120. Therefore, the reflective layer 112 covering part of the connecting piece 122 can reduce the light leakage phenomenon caused by the reflection of light through the base plate 120 or the positioning part 121'.

[0041] Figure 8 This is a partial cross-sectional view of a keyboard according to another embodiment of the present invention. Please refer to... Figure 8 The keyboard 100C in this embodiment and Figure 2 The keyboards 100 shown are largely the same in design, with the main difference being the structural design of the positioning portion. In the keyboard 100C of this embodiment, the positioning portion 1211 protrudes towards the thin-film circuit 130 and has a recess 1212 facing the backlight module 110. On the other hand, the reflective layer 112 has a reflective extension 112c extending into the perforation 113a of the light guide layer 113, wherein the reflective extension 112c covers the inner wall surface of the perforation 113a of the light guide layer 113 and contacts the light shielding layer 114, for example, the reflective extension 112c is glued to the light shielding layer 114. Therefore, the reflective extension 112c can block the transmission path of light from the inner wall surface of the perforation 113a of the light guide layer 113 to the positioning portion 1211 of the base plate 120.

[0042] like Figure 8 As shown, the reflective extension 112c extends further beyond the perforation 113a of the light guide layer 113 and through the opening 114b of the light shielding layer 114, extending into the recess 1212 of the positioning portion 1211 and contacting the inner surface of the recess 1212, thereby reducing light leakage caused by the reflection of leaked light through the inner surface of the recess 1212. On the other hand, the fixing member 150 passes through the reflective extension 112c, the positioning portion 1211, and the thin film circuit 130 of the reflective layer 112, and locks into the frame 170 provided on the thin film circuit 130. Furthermore, the opening 112a of the reflective layer 112 falls on the reflective extension 112c, wherein the positioning portion 1211 has an opening 121c corresponding to the opening 112a, and the thin film circuit 130 has an opening 136 corresponding to the opening 121c. The fastener 150 passes sequentially through the opening 112a of the reflective layer 112, the opening 121c of the positioning part 1211, and the opening 136 of the thin film circuit 130, and is locked into the frame 170.

[0043] Figure 9 This is a partial cross-sectional schematic diagram of a keyboard according to a further embodiment of the present invention. Please refer to... Figure 9 The keyboard 100D in this embodiment and Figure 8 The keyboard 100C shown is largely the same in design, with the main difference being that in the keyboard 100D of this embodiment, the reflective extension 112c does not extend beyond the perforation 113a of the light guide layer 113, nor does it pass through the opening 114b of the light shielding layer 114. Correspondingly, the light shielding layer 114 has a light shielding extension 114c protruding towards the thin-film circuit 130, wherein the light shielding extension 114c extends into the recess 1212 of the positioning portion 1211 and contacts the inner surface of the recess 1212.

[0044] like Figure 9 As shown, the fastener 150 passes through the light-shielding extension 114c, the positioning part 1211, and the thin-film circuit 130 of the light-shielding layer 114, and is locked into the frame 170. Furthermore, the opening 114b of the light-shielding layer 114 falls on the light-shielding extension 114c, wherein the positioning part 1211 has an opening 121c corresponding to the opening 114b, and the thin-film circuit 130 has an opening 136 corresponding to the opening 121c. The fastener 150 sequentially passes through the opening 114b of the light-shielding layer 114, the opening 121c of the positioning part 1211, and the opening 136 of the thin-film circuit 130, and is locked into the frame 170.

[0045] In summary, in the keyboard of the present invention, the base plate has a positioning portion for fixing the fastener, thereby improving the assembly reliability and structural integration of the keyboard while meeting the design requirements of thinness and lightness. Furthermore, the positioning portion of the base plate is configured to correspond to the perforations in the light guide layer, and the light-shielding layer and the reflective layer are in contact within the perforations of the light guide layer. This blocks the transmission path of light from the perforations of the light guide layer to the positioning portion of the base plate, preventing light from escaping from the gap between the fastener and the backlight module, thereby improving light leakage or uneven light effect.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A keyboard, characterized in that, include: A backlight module includes a light source, a reflective layer, a light guide layer, and a light shielding layer, wherein the light guide layer is disposed on the reflective layer, and the light shielding layer is disposed on the light guide layer, the light source is disposed corresponding to the light guide layer, and the light guide layer is located between the light shielding layer and the reflective layer, wherein the light guide layer has a perforation, and the light shielding layer and the reflective layer are in contact within the perforation of the light guide layer; A base plate is disposed on the light-shielding layer; A thin-film circuit is disposed on the base plate, wherein the base plate has a positioning portion corresponding to the perforation of the light guide layer, the positioning portion protruding toward the reflective layer and extending into the perforation of the light guide layer to contact the reflective layer or the light shielding layer; as well as Multiple button structures are disposed on the thin-film circuit.

2. The keyboard according to claim 1, characterized in that, Both the light-shielding layer and the reflective layer have openings that partially overlap with the perforations in the light-guiding layer, and the positioning portion of the base plate passes through the openings in the light-shielding layer and the reflective layer.

3. The keyboard according to claim 1, characterized in that, The positioning part includes a base part and a fixing part that engages with the base part, wherein the base part contacts the reflective layer or the light-shielding layer, and the fixing part penetrates the reflective layer.

4. The keyboard according to claim 1, characterized in that, The light-shielding layer has a light-shielding extension extending into the perforation of the light guide layer, the light-shielding extension covering the inner wall of the perforation of the light guide layer and contacting the reflective layer.

5. The keyboard according to claim 1, characterized in that, The reflective layer has a reflective extension extending into the perforation of the light guide layer, the reflective extension covering the inner wall of the perforation of the light guide layer and contacting the light shielding layer.

6. The keyboard according to claim 1, characterized in that, The thin-film circuit has an opening facing the positioning portion to accommodate the positioning portion.

7. The keyboard according to any one of claims 1 to 6, characterized in that, It also includes a flexible circuit board for connecting the backlight module, wherein the flexible circuit board includes an electrical connection portion, a conductive terminal disposed at the end of the electrical connection portion, and a pull tab for connecting the electrical connection portion, and the pull tab and the conductive terminal are located on the same side of the electrical connection portion.

8. The keyboard according to any one of claims 1 to 6, characterized in that, The positioning part of the base plate is located between two adjacent button structures.

9. A keyboard, characterized in that, include: A backlight module includes a light source, a reflective layer, a light guide layer, and a light shielding layer, wherein the light guide layer is disposed on the reflective layer, and the light shielding layer is disposed on the light guide layer, the light source is disposed corresponding to the light guide layer, and the light guide layer is located between the light shielding layer and the reflective layer, wherein the light guide layer has perforations, and the light shielding layer is in contact with the reflective layer; A base plate is disposed on the light-shielding layer, wherein the base plate has a positioning portion corresponding to the perforation of the light guide layer, and the light-shielding layer and the reflective layer cover at least a portion of the positioning portion, the positioning portion protrudes toward the reflective layer and extends into the perforation of the light guide layer to contact the reflective layer or the light-shielding layer; Thin-film circuitry is disposed on the substrate; as well as Multiple button structures are disposed on the thin-film circuit.

10. The keyboard according to claim 9, characterized in that, Both the light-shielding layer and the reflective layer have openings that partially overlap with the perforations in the light-guiding layer, and the positioning portion of the base plate passes through the openings in the light-shielding layer and the reflective layer.

11. The keyboard according to claim 9, characterized in that, The positioning part includes a base part and a fixing part that engages with the base part, wherein the base part contacts the reflective layer or the light-shielding layer, and the fixing part penetrates the reflective layer.

12. The keyboard according to claim 9, characterized in that, The light-shielding layer has a light-shielding extension extending into the perforation of the light guide layer, the light-shielding extension covering the inner wall of the perforation of the light guide layer and contacting the reflective layer.

13. The keyboard according to claim 9, characterized in that, The reflective layer has a reflective extension extending into the perforation of the light guide layer, the reflective extension covering the inner wall of the perforation of the light guide layer and contacting the light shielding layer.

14. The keyboard according to claim 9, characterized in that, The thin-film circuit has an opening facing the positioning portion to accommodate the positioning portion.

15. The keyboard according to any one of claims 9 to 14, characterized in that, It also includes a flexible circuit board for connecting the backlight module, wherein the flexible circuit board includes an electrical connection portion, a conductive terminal disposed at the end of the electrical connection portion, and a pull tab for connecting the electrical connection portion, and the pull tab and the conductive terminal are located on the same side of the electrical connection portion.

16. The keyboard according to any one of claims 9 to 14, characterized in that, The positioning part of the base plate is located between two adjacent button structures.

17. A keyboard, characterized in that, include: A backlight module includes a light source, a reflective layer, a light guide layer, and a light shielding layer, wherein the light guide layer is disposed on the reflective layer, and the light shielding layer is disposed on the light guide layer, the light source is disposed corresponding to the light guide layer, and the light guide layer is located between the light shielding layer and the reflective layer, wherein the light guide layer has a perforation, and the light shielding layer and the reflective layer are in contact within the perforation of the light guide layer; A base plate is disposed on the light-shielding layer; A thin-film circuit is disposed on the base plate, wherein the base plate has a positioning portion corresponding to the perforation of the light guide layer, and the positioning portion protrudes toward the thin-film circuit and has a recess toward the backlight module; as well as Multiple button structures are disposed on the thin-film circuit.

18. The keyboard according to claim 17, characterized in that, The reflective layer has a reflective extension extending into the perforation of the light guide layer, the reflective extension covering the inner wall of the perforation of the light guide layer and contacting the light shielding layer.

19. The keyboard according to claim 18, characterized in that, It also includes a fastener fixed to the positioning portion, the reflective extension of the reflective layer further extends to the outside of the perforation of the light guide layer and through the light shielding layer to extend into the recess of the positioning portion, and the fastener passes through the reflective extension of the reflective layer, the positioning portion and the thin film circuit.

20. The keyboard according to claim 18, characterized in that, It also includes a fastener fixed to the positioning portion, the light-shielding layer having a light-shielding extension protruding toward the thin film circuit, wherein the light-shielding extension extends into the recess of the positioning portion, and the fastener passes through the light-shielding extension of the light-shielding layer, the positioning portion and the thin film circuit.

21. The keyboard according to claim 18, characterized in that, It also includes a fastener fixed to the positioning part and a frame disposed on the thin film circuit, the fastener passing through the positioning part and the thin film circuit and locking into the frame.

22. The keyboard according to any one of claims 17 to 21, characterized in that, It also includes a flexible circuit board for connecting the backlight module, wherein the flexible circuit board includes an electrical connection portion, a conductive terminal disposed at the end of the electrical connection portion, and a pull tab for connecting the electrical connection portion, and the pull tab and the conductive terminal are located on the same side of the electrical connection portion.

23. The keyboard according to any one of claims 17 to 21, characterized in that, The positioning part of the base plate is located between two adjacent button structures.

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