Membrane switch circuit board, keyboard and method for manufacturing keyboard

Abstract

The invention discloses a membrane switch circuit board, a keyboard and a method for manufacturing the keyboard. The frame of the keyboard comprises a first key part and a second key part. The membrane switch circuit board comprises a first flexible mainboard corresponding to the first key part, a first circuit, a second flexible mainboard corresponding to the second key part, a second circuit, a flexible strip-shaped connecting plate and a third circuit. The first circuit is formed on the first flexible mainboard and forms a plurality of first push switches. The second circuit is formed on the second flexible mainboard and forms a plurality of second push switches. The soft strip-shaped connecting plate is connected between the first soft main plate and the second soft main plate and comprises a bending part. The third circuit is formed on the flexible strip-shaped connecting plate and is electrically connected to the first circuit and the second circuit. The keyboard accords with ergonomics, all the keycaps are flatly arranged in the corresponding openings of the frame, and the two keys which are operated by the two thumbs of a user on the keyboard are adjacent to each other, so that the user can operate the two keys without bending the thumbs.

Description

Technical Field

[0001] The present invention relates to a membrane switch circuit board, a keyboard including the membrane switch circuit board, and a method for manufacturing the keyboard, and particularly relates to a membrane switch circuit board suitable for an ergonomic keyboard, an ergonomic keyboard including the membrane switch circuit board, and a method for manufacturing the ergonomic keyboard. Background Art

[0002] A keyboard is an essential input peripheral for operating a computer. When operating a general keyboard, the positions of the user's left palm and right palm on the keyboard are nearly parallel, causing the user's palms to extend outward at a certain angle relative to the arms, which is not in the habitual natural state. Therefore, when the user operates the keyboard for a long time, repetitive compression injuries may occur due to the incorrect posture of using the keyboard, easily causing injuries to the user's wrists, fingers, hand joints, and shoulders.

[0003] In order to prevent computer users from suffering repetitive compression injuries due to incorrect postures when operating the keyboard for a long time, keyboards designed with ergonomics as the main axis have emerged on the market.

[0004] Regarding the prior art of ergonomic keyboards, the membrane switch circuit board has no special structural design. Therefore, during the assembly of the prior art ergonomic keyboards, the membrane switch circuit board is locally distorted in multiple places, resulting in uneven heights of the keycaps placed in the openings of the keyboard frame corresponding to the distorted parts of the membrane switch circuit board, making the appearance of the ergonomic keyboard unattractive. Even the keycaps of the prior art ergonomic keyboards touch the inner walls of the openings, causing the keycaps to rub against the inner walls of the openings during operation.

[0005] In addition, the keys for the user's two thumbs to operate on a general keyboard are all blank keys with double-width keycaps. However, in the prior art ergonomic keyboards, multiple keys are divided into two key parts. The lower edges of the two key parts are far apart for the user's two thumbs to operate. Whether the two keys that are far apart are blank keys or not, the user has to bend the thumbs to operate these two keys, which will cause injuries to the user's two thumbs, deviating from the original intention of the ergonomic keyboard design. Summary of the Invention

[0006] The object of the present invention is to provide a membrane switch circuit board suitable for an ergonomic keyboard, an ergonomic keyboard including the membrane switch circuit board, and a method for manufacturing the ergonomic keyboard.

[0007] To achieve the above object, the present invention provides a membrane switch circuit board applicable to a keyboard. The keyboard includes a frame, which includes a first key portion, a second key portion, and a connecting portion connecting the first key portion and the second key portion. The connecting portion has a curved surface that bends upward. The membrane switch circuit board includes a first flexible main board, a first circuit, a second flexible main board, a second circuit, a first flexible strip connecting plate, and a third circuit. The first flexible main board corresponds to the first key portion and has a first leading edge, a first trailing edge, and a first side edge; the first circuit is formed on the first flexible main board and constitutes a plurality of first push switches; the second flexible main board corresponds to the second key portion and has a second leading edge, a second trailing edge, and a second side edge. The second side edge faces the first side edge. The distance between the first side edge and the second side edge adjacent to the first leading edge and the second leading edge is defined as a first distance, and the distance between the first side edge and the second side edge adjacent to the first trailing edge and the second trailing edge is defined as a second distance. The first distance is less than the second distance; the second circuit is formed on the second flexible main board and constitutes a plurality of second push switches; the first flexible strip connecting plate is connected between the first side edge and the second side edge and is close to the first trailing edge and the second trailing edge. The first flexible strip connecting plate includes a first bending portion that extends toward the first leading edge; the third circuit is formed on the first flexible strip connecting plate and is electrically connected to the first circuit and the second circuit.

[0008] As an optional technical solution, the membrane switch circuit board further includes at least one second flexible strip connecting plate and a fourth circuit. The at least one second flexible strip connecting plate is connected between the first side edge and the second side edge and is close to the first leading edge and the second leading edge. Each second flexible strip connecting plate includes a second bending portion, and the second bending portion of each second flexible strip connecting plate extends toward the first trailing edge; the fourth circuit is formed on the at least one second flexible strip connecting plate and is electrically connected to the first circuit and the second circuit.

[0009] The present invention also provides another membrane switch circuit board applicable to a keyboard. The keyboard includes a frame which comprises a first key portion, a second key portion, and a connecting portion connecting the first key portion and the second key portion. The connecting portion has a curved surface that bends upward. The membrane switch circuit board includes a first flexible main board, a first circuit, a second flexible main board, a second circuit, a flexible connecting plate, and a third circuit. The first flexible main board corresponds to the first key portion and has a first leading edge, a first trailing edge, and a first side edge. The first circuit is formed on the first flexible main board and constitutes a plurality of first pressing switches. The second flexible main board corresponds to the second key portion and has a second leading edge, a second trailing edge, and a second side edge. The second side edge faces the first side edge. The distance between the first side edge and the second side edge adjacent to the first leading edge and the second leading edge is defined as a first spacing, and the distance between the first side edge and the second side edge adjacent to the first trailing edge and the second trailing edge is defined as a second spacing. The first spacing is less than the second spacing. The second circuit is formed on the second flexible main board and constitutes a plurality of second pressing switches. The flexible connecting plate is connected between the first side edge and the second side edge and has a plurality of perforations. The third circuit is formed on the flexible connecting plate and is electrically connected to the first circuit and the second circuit.

[0010] The present invention also provides yet another membrane switch circuit board applicable to a keyboard. The keyboard includes a frame which comprises a first key portion, a second key portion, and a connecting portion connecting the first key portion and the second key portion. The connecting portion has a curved surface that bends upward. The membrane switch circuit board includes a first flexible main board, a first circuit, a second flexible main board, a second circuit, a plurality of flexible strip-shaped connecting plates, and a third circuit. The first flexible main board corresponds to the first key portion and has a first leading edge, a first trailing edge, and a first side edge. The first circuit is formed on the first flexible main board and constitutes a plurality of first pressing switches. The second flexible main board corresponds to the second key portion and has a second leading edge, a second trailing edge, and a second side edge. The second side edge faces the first side edge. The distance between the first side edge and the second side edge adjacent to the first leading edge and the second leading edge is defined as a first spacing, and the distance between the first side edge and the second side edge adjacent to the first trailing edge and the second trailing edge is defined as a second spacing. The first spacing is less than the second spacing. The second circuit is formed on the second flexible main board and constitutes a plurality of second pressing switches. The plurality of flexible strip-shaped connecting plates are all connected between the first side edge and the second side edge, and at least one of the plurality of flexible strip-shaped connecting plates has a plurality of perforations. The third circuit is formed on at least one of the plurality of flexible strip-shaped connecting plates and is electrically connected to the first circuit and the second circuit.

[0011] The present invention further provides another membrane switch circuit board, which is applicable to a keyboard. The keyboard includes a frame, and the frame includes a first key portion, a second key portion, and a connecting portion connecting the first key portion and the second key portion. The connecting portion has a curved surface that bends upward. The membrane switch circuit board includes a first flexible main board, a first circuit, a second flexible main board, a second circuit, a flexible connecting board, and a third circuit. The first flexible main board corresponds to the first key portion and has a first leading edge, a first trailing edge, and a first side edge. The first circuit is formed on the first flexible main board and constitutes a plurality of first push switches. The second flexible main board corresponds to the second key portion and has a second leading edge, a second trailing edge, and a second side edge. The second side edge faces the first side edge. The distance between the first side edge and the second side edge adjacent to the first leading edge and the second leading edge is defined as a first spacing, and the distance between the first side edge and the second side edge adjacent to the first trailing edge and the second trailing edge is defined as a second spacing. The first spacing is smaller than the second spacing. The second circuit is formed on the second flexible main board and constitutes a plurality of second push switches. The flexible connecting board is connected between the first side edge and the second side edge. The flexible connecting board has a third leading edge and a third trailing edge. The third leading edge is on the same side as the first leading edge and the second leading edge, and the third trailing edge is on the same side as the first trailing edge and the second trailing edge. The flexible connecting board has a first notch, a second notch, and a perforation. The first notch is formed on the third leading edge and extends toward the third trailing edge. The second notch is formed on the third trailing edge and extends toward the third leading edge. The perforation is formed between the first notch and the second notch. The third circuit is formed on the flexible connecting board and is electrically connected to the first circuit and the second circuit.

[0012] As an optional technical solution, the flexible connecting board further has a plurality of through slits formed around the perforation and extending outward.

[0013] The present invention further provides a keyboard, which includes the above-mentioned membrane switch circuit, a frame, a plurality of first key structures, and a plurality of second key structures. The frame includes a first key portion, a second key portion, and a connecting portion. The connecting portion is connected between the first key portion and the second key portion. The first key portion corresponds to the first flexible main board, and the second key portion corresponds to the second flexible main board. The first key portion has a plurality of through first openings, and the second key portion has a plurality of through second openings. The connecting portion has a curved surface that bends upward. The plurality of first key structures are arranged corresponding to the plurality of through first openings. The plurality of second key structures are arranged corresponding to the plurality of through second openings.

[0014] As an alternative technical solution, the multiple first key structures and the multiple second key structures include multiple first keycaps, multiple second keycaps, a first bottom plate, and a second bottom plate. Each first keycap corresponds to a through first opening and is placed within its corresponding through first opening; each second keycap corresponds to a through second opening and is placed within its corresponding through second opening; the first bottom plate is fixed below the first bottom surface of the first key portion, wherein the first flexible main board is placed between the first key portion and the first bottom plate and is smoothly placed on the first upper surface of the first bottom plate; the second bottom plate is fixed below the second bottom surface of the second key portion, wherein the second flexible main board is placed between the second key portion and the second bottom plate and is smoothly placed on the second upper surface of the second bottom plate; wherein, there is a first gap between each first keycap and the first inner wall of the corresponding through first opening, and there is a second gap between each second keycap and the second inner wall of the corresponding through second opening.

[0015] As an alternative technical solution, the frame includes multiple heat melting posts, the multiple heat melting posts are formed on the first bottom surface of the first key portion and the second bottom surface of the second key portion. The membrane switch circuit also has multiple through holes formed on the first flexible main board and the second flexible main board. Each through hole corresponds to a heat melting post. The first bottom plate has multiple first bonding holes, each first bonding hole corresponds to a heat melting post. The second bottom plate has multiple second bonding holes, each second bonding hole corresponds to a heat melting post. Each heat melting post passes through its corresponding through hole and its end is heat melted to be bonded to its corresponding first bonding hole or its corresponding second bonding hole.

[0016] As an alternative technical solution, the lower edge first opening among the multiple through first openings is adjacent to the lower edge second opening among the multiple through second openings.

[0017] The present invention also provides a method for manufacturing a keyboard, including the following steps: preparing the above-mentioned membrane switch circuit, frame, multiple first key structures, and multiple second key structures. The frame includes a first key portion, a second key portion, and a connecting portion. The connecting portion is connected between the first key portion and the second key portion. The first key portion corresponds to the first flexible main board, the second key portion corresponds to the second flexible main board. The first key portion has multiple through first openings, the second key portion has multiple through second openings, and the connecting portion has a curved surface that bends upward; assembling the multiple first key structures corresponding to the multiple through first openings, and assembling the multiple second key structures corresponding to the multiple through second openings.

[0018] As an alternative technical solution, the plurality of first key structures and the plurality of second key structures include a plurality of first keycaps, a plurality of second keycaps, a first bottom plate, and a second bottom plate. Assembling the plurality of first keys and the plurality of second keys includes: each first keycap corresponding to a through first opening and being placed within its corresponding through first opening; each second keycap corresponding to a through second opening and being placed within its corresponding through second opening; fixing the first bottom plate below the first bottom surface of the first key portion, placing the first flexible main board between the first key portion and the first bottom plate and smoothly on the first upper surface of the first bottom plate; fixing the second bottom plate below the second bottom surface of the second key portion, wherein the second flexible main board is placed between the second key portion and the second bottom plate and smoothly on the second upper surface of the second bottom plate; wherein, there is a first gap between each first keycap and the first inner wall of the corresponding through first opening, and there is a second gap between each second keycap and the second inner wall of the corresponding through second opening.

[0019] As an alternative technical solution, the frame further includes a plurality of hot melt posts formed on the first bottom surface of the first key portion and the second bottom surface of the second key portion. The membrane switch circuit further has a plurality of through holes formed on the first flexible main board and the second flexible main board, each through hole corresponding to a hot melt post. The first bottom plate has a plurality of first bonding holes, each first bonding hole corresponding to a hot melt post. The second bottom plate has a plurality of second bonding holes, each second bonding hole corresponding to a hot melt post. The method of manufacturing the keyboard further includes: passing each hot melt post through its corresponding through hole and melting the end thereof to bond it together with its corresponding first bonding hole or its corresponding second bonding hole.

[0020] Different from the prior art, in the present invention, the first flexible main board of the membrane switch circuit is placed between the first key portion and the first bottom plate and smoothly on the first upper surface of the first bottom plate, and the second flexible main board of the membrane switch circuit is placed between the second key portion and the second bottom plate and smoothly on the second upper surface of the second bottom plate. Therefore, the keyboard of the present invention conforms to ergonomics and all keycaps are flatly placed within the corresponding openings of the frame. Moreover, the two keys on the keyboard for the two thumbs of the user to operate are adjacent, and the user does not need to bend the thumbs to operate these two keys.

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but it is not intended to limit the present invention. Description of the Drawings

[0022] Figure 1 A top view of the membrane switch circuit board of the first preferred specific embodiment of the present invention;

[0023] Figure 2Top view of the membrane switch circuit board according to the second preferred specific embodiment of the present invention;

[0024] Figure 3 Partial top view of the membrane switch circuit board according to the third preferred specific embodiment of the present invention;

[0025] Figure 4 Partial top view of the membrane switch circuit board according to the fourth preferred specific embodiment of the present invention;

[0026] Figure 5 Partial top view of a deformation of the membrane switch circuit board according to the fourth preferred specific embodiment of the present invention;

[0027] Figure 6 Partial top view of another deformation of the membrane switch circuit board according to the fourth preferred specific embodiment of the present invention;

[0028] Figure 7 Partial top view of another deformation of the membrane switch circuit board according to the fourth preferred specific embodiment of the present invention;

[0029] Figure 8 Partial cross-sectional schematic view of the keyboard according to the fifth preferred specific embodiment of the present invention. Detailed Description of the Preferred Embodiments

[0030] To further understand the purpose, structure, features and functions of the present invention, the following is a detailed description in conjunction with the embodiments.

[0031] Please refer to Figure 1 , Figure 1 The membrane switch circuit board 1 of the first preferred specific example of the present invention is shown in a top view. The membrane switch circuit board 1 of the first preferred specific embodiment of the present invention is applicable to a keyboard. The keyboard includes a frame. The frame includes a first key portion, a second key portion, and a connecting portion connecting the first key portion and the second key portion. In one embodiment, the connecting portion has a curved surface that bends upward. That is to say, this keyboard conforms to ergonomics.

[0032] As Figure 1 shown, the membrane switch circuit board 1 of the first preferred specific embodiment of the present invention includes a first flexible main board 10, a first circuit 11, a second flexible main board 12, a second circuit 13, a first flexible strip connecting board 14, and a third circuit 15.

[0033] The first flexible main board 10 corresponds to the first key portion, and the first flexible main board 10 has a first leading edge 100, a first trailing edge 102, and a first side edge 104. The first circuit 11 is formed on the first flexible main board 10 and constitutes a plurality of first push switches 110. In Figure 1In the figure, since the circuit of the first circuit 11 is complex, only a plurality of first push switches 110 are shown as representatives.

[0034] The second flexible main board 12 corresponds to the second key portion and has a second leading edge 120, a second trailing edge 122, and a second side edge 124. The second side edge 124 of the second flexible main board 12 faces the first side edge 104 of the first flexible main board 10. The distance between the first side edge 104 of the first flexible main board 10 and the second side edge 124 of the second flexible main board 12 between the first leading edge 100 of the first flexible main board 10 and the second leading edge 120 of the second flexible main board 12 is defined as the first spacing d1. The distance between the first side edge 104 of the first flexible main board 10 and the second side edge 124 of the second flexible main board 12 between the first trailing edge 102 of the first flexible main board 10 and the second trailing edge 122 of the second flexible main board 12 is defined as the second spacing d2. It should be emphasized that the first spacing d1 is less than the second spacing d2.

[0035] The second circuit 13 is formed on the second flexible main board 12 and constitutes a plurality of second push switches 130. In Figure 1 the figure, since the circuit of the second circuit 13 is complex, only a plurality of second push switches 130 are shown as representatives. The first flexible strip-shaped connecting board 14 is connected between the first side edge 104 of the first flexible main board 10 and the second side edge 124 of the second flexible main board 12 and is close to the first trailing edge 102 of the first flexible main board 10 and the second trailing edge 122 of the second flexible main board 12. The first flexible strip-shaped connecting board 14 includes a first bending portion 140. The first bending portion 140 of the first flexible strip-shaped connecting board 14 extends toward the first leading edge 100 of the first flexible main board 10. The third circuit 15 is formed on the first flexible strip-shaped connecting board 14 and is electrically connected to the first circuit 11 and the second circuit 13. Thus, when the membrane switch circuit board 1 of the first preferred specific embodiment of the present invention is assembled into the keyboard, the first flexible main board 10 and the second flexible main board 12 will not be distorted, and the first flexible strip-shaped connecting board 14 will be distorted, so that all the key caps are flatly placed in the corresponding openings of the frame.

[0036] Furthermore, similarly as in Figure 1As shown in the figure, the membrane switch circuit board 1 of the first preferred specific embodiment of the present invention further includes at least one second flexible strip-shaped connecting board 16 and a fourth circuit 17. At least one second flexible strip-shaped connecting board 16 is connected between the first side edge 104 of the first flexible main board 10 and the second side edge 124 of the second flexible main board 12, and is close to the first front edge 100 of the first flexible main board 10 and the second front edge 120 of the second flexible main board 12. Each second flexible strip-shaped connecting board 16 includes a second bending portion 160. The second bending portion 160 of each second flexible strip-shaped connecting board 16 extends towards the first rear edge 102 of the first flexible main board 10. The fourth circuit 17 is formed on at least one second flexible strip-shaped connecting board 16 and is electrically connected to the first circuit 11 and the second circuit 13. When the membrane switch circuit board 1 of the first preferred specific embodiment of the present invention is assembled into the keyboard, at least one second flexible strip-shaped connecting board 16 will be distorted.

[0037] Please refer to Figure 2 , Figure 2 FIG. shows the membrane switch circuit board 2 of the second preferred specific example of the present invention in a top view. The membrane switch circuit board 2 of the second preferred specific embodiment of the present invention is applicable to a keyboard. The keyboard includes a frame. The frame includes a first key portion, a second key portion, and a connecting portion connecting the first key portion and the second key portion. In one embodiment, the connecting portion has a curved surface that bends upward. That is to say, this keyboard conforms to ergonomics.

[0038] As Figure 2 shown, the membrane switch circuit board 2 of the second preferred specific embodiment of the present invention includes a first flexible main board 20, a first circuit 21, a second flexible main board 22, a second circuit 23, a flexible connecting board 24, and a third circuit 25.

[0039] The first flexible main board 20 corresponds to the first key portion, and the first flexible main board 20 has a first front edge 200, a first rear edge 202, and a first side edge 204. The first circuit 21 is formed on the first flexible main board 20 and constitutes a plurality of first push switches 210. In Figure 2 the figure, since the circuit of the first circuit 21 is complex, only a plurality of first push switches 210 are shown as representatives.

[0040] The second flexible main board 22 corresponds to the second key portion, and the second flexible main board 22 has a second leading edge 220, a second trailing edge 222, and a second side edge 224. The second side edge 224 of the second flexible main board 22 faces the first side edge 204 of the first flexible main board 20. The distance between the first side edge 204 of the first flexible main board 20 and the second side edge 224 of the second flexible main board 22 between the first leading edge 200 of the first flexible main board 20 adjacent to the second leading edge 220 of the second flexible main board 22 is defined as the first distance d1. The distance between the first side edge 204 of the first flexible main board 20 and the second side edge 224 of the second flexible main board 22 between the first trailing edge 202 of the first flexible main board 20 adjacent to the second trailing edge 222 of the second flexible main board 22 is defined as the second distance d2. It should be emphasized that the first distance d1 is less than the second distance d2.

[0041] The second circuit 23 is formed on the second flexible main board 22 and constitutes a plurality of second push switches 230. In Figure 2 Since the circuit of the second circuit 23 is complex, only a plurality of second push switches 230 are shown as representatives. The flexible connecting board 24 is connected between the first side edge 204 of the first flexible main board 20 and the second side edge 224 of the second flexible main board 22. The flexible connecting board 24 has a plurality of perforations 240. The third circuit 25 is formed on the flexible connecting board 24 and is electrically connected to the first circuit 21 and the second circuit 23. Thereby, when the membrane switch circuit board 2 of the second preferred specific embodiment of the present invention is assembled into the keyboard, the first flexible main board 20 and the second flexible main board 22 will not be distorted, and the flexible connecting board 24 will be distorted, so that all the key caps are flatly placed in the corresponding openings of the frame.

[0042] Please refer to Figure 3 , Figure 3 which shows a partial top view of the membrane switch circuit board 3 of the third preferred specific example of the present invention. The membrane switch circuit board 3 of the third preferred specific embodiment of the present invention is applicable to a keyboard. The keyboard includes a frame. The frame includes a first key portion, a second key portion, and a connecting portion connecting the first key portion and the second key portion. The connecting portion has a curved surface that bends upward. That is to say, this keyboard conforms to ergonomics.

[0043] As Figure 3 shown, the membrane switch circuit board 3 of the third preferred specific embodiment of the present invention includes a first flexible main board 30, a first circuit 31, a second flexible main board 32, a second circuit 33, a plurality of flexible strip connecting boards 34, and a third circuit 35.

[0044] The first flexible main board 30 corresponds to the first key portion, and the first flexible main board 30 has a first leading edge 300, a first trailing edge 302, and a first side edge 304. The first circuit 31 is formed on the first flexible main board 30 and constitutes a plurality of first push switches 310. InFigure 3 In this case, since the circuit of the first circuit 31 is complex, only a plurality of first push switches 310 are shown as representatives.

[0045] The second flexible main board 32 corresponds to the second key portion, and the second flexible main board 32 has a second leading edge 320, a second trailing edge 322, and a second side edge 324. The second side edge 324 of the second flexible main board 32 faces the first side edge 304 of the first flexible main board 30. The distance between the first side edge 304 of the first flexible main board 30 and the second side edge 324 of the second flexible main board 32 between the first leading edge 300 of the first flexible main board 30 adjacent to the second leading edge 320 of the second flexible main board 32 is defined as a first distance d1. The distance between the first side edge 304 of the first flexible main board 30 and the second side edge 324 of the second flexible main board 32 between the first trailing edge 302 of the first flexible main board 30 adjacent to the second trailing edge 322 of the second flexible main board 32 is defined as a second distance d2. It should be emphasized that the first distance d1 is less than the second distance d2.

[0046] The second circuit 33 is formed on the second flexible main board 32 and constitutes a plurality of second push switches 330. In Figure 3 this case, since the circuit of the second circuit 33 is complex, only a plurality of second push switches 330 are shown as representatives. A plurality of flexible strip connecting plates 34 are all connected between the first side edge 304 of the first flexible main board 30 and the second side edge 324 of the second flexible main board 32. At least one of the plurality of flexible strip connecting plates 34 has a plurality of perforations 340. The third circuit 35 is formed on at least one of the plurality of flexible strip connecting plates 34, and the third circuit 35 is electrically connected to the first circuit 31 and the second circuit 33. Thereby, when the membrane switch circuit board 3 of the third preferred specific embodiment of the present invention is assembled into the keyboard, the first flexible main board 30 and the second flexible main board 32 will not be distorted, while the plurality of flexible strip connecting plates 34 will be distorted, so that all the keycaps are placed flatly in the corresponding openings of the frame.

[0047] Please refer to Figure 4 、 Figure 5 、 Figure 6 and Figure 7 , all of which show the membrane switch circuit board 4 of the fourth preferred specific example of the present invention in a partial top view. There are only slight differences in the arrangement of the first notch 444, the perforations 448, the third circuit 45, and the slit 449 on the flexible connecting plate 44 among different diagrams. The membrane switch circuit board 4 of the fourth preferred specific embodiment of the present invention is applicable to a keyboard. The keyboard includes a frame. The frame includes a first key portion, a second key portion, and a connecting portion connecting the first key portion and the second key portion. The connecting portion has a curved surface that bends upward. That is to say, this keyboard conforms to ergonomics.

[0048] As shown in Figure 4 , Figure 5 , Figure 6 and Figure 7 , the membrane switch circuit board 4 of the fourth preferred specific embodiment of the present invention includes a first flexible main board 40, a first circuit 41, a second flexible main board 42, a second circuit 43, a flexible connection board 44, and a third circuit 45.

[0049] The first flexible main board 40 corresponds to the first button portion, and the first flexible main board 40 has a first leading edge 400, a first trailing edge 402, and a first side edge 404. The first circuit 41 is formed on the first flexible main board 40 and constitutes a plurality of first push switches 410. In Figure 4 , Figure 5 , Figure 6 and Figure 7 , since the circuit of the first circuit 41 is complex, only a plurality of first push switches 410 are shown as representatives.

[0050] The second flexible main board 42 corresponds to the second button portion, and the second flexible main board 42 has a second leading edge 420, a second trailing edge 422, and a second side edge 424. The second side edge 424 of the second flexible main board 42 faces the first side edge 404 of the first flexible main board 40. The distance between the first side edge 404 of the first flexible main board 40 and the second side edge 424 of the second flexible main board 42 between the first leading edge 400 of the first flexible main board 40 and the second leading edge 420 of the second flexible main board 42 is defined as a first distance d1. The distance between the first side edge 404 of the first flexible main board 40 and the second side edge 424 of the second flexible main board 42 between the first trailing edge 402 of the first flexible main board 40 and the second trailing edge 422 of the second flexible main board 42 is defined as a second distance d2. It should be emphasized that the first distance d1 is less than the second distance d2.

[0051] The second circuit 43 is formed on the second flexible main board 42 and constitutes a plurality of second push switches 430. In Figure 4 , Figure 5 , Figure 6 and Figure 7In [the figure], due to the complex circuitry of the second circuit 43, only a plurality of second push switches 430 are shown as representatives. The flexible connection board 44 is connected between the first side edge 404 of the first flexible main board 40 and the second side edge 424 of the second flexible main board 42. The flexible connection board 44 has a third leading edge 440 and a third trailing edge 442. The third leading edge 440 of the flexible connection board 44 is on the same side as the first leading edge 400 of the first flexible main board 40 and the second leading edge 420 of the second flexible main board 42. The third trailing edge 442 of the flexible connection board 44 is on the same side as the first trailing edge 402 of the first flexible main board 40 and the second trailing edge 422 of the second flexible main board 42. The flexible connection board 44 has a first notch 444, a second notch 446, and a perforation 448. The first notch 444 of the flexible connection board 44 is formed on the third leading edge 440 of the flexible connection board 44 and extends towards the third trailing edge 442 of the flexible connection board 44. The second notch 446 of the flexible connection board 44 is formed on the third trailing edge 442 of the flexible connection board 44 and extends towards the third leading edge 440 of the flexible connection board 44. The perforation 448 of the flexible connection board 44 is formed between the first notch 444 and the second notch 446 of the flexible connection board 44. The third circuit 45 is formed on the flexible connection board 44, and the third circuit 45 is electrically connected to the first circuit 41 and the second circuit 43. Thus, when the membrane switch circuit board 4 of the fourth preferred specific embodiment of the present invention is assembled into the keyboard, the first flexible main board 40 and the second flexible main board 42 will not be distorted, while the flexible connection board 44 will be distorted, such that all the keycaps are placed flatly within the corresponding openings of the frame.

[0052] In a specific embodiment, as Figure 5 , Figure 6 and Figure 7 shown, the flexible connection board 44 further has a plurality of through slits 449. The plurality of through slits 449 of the flexible connection board 44 are formed around the perforation 448 of the flexible connection board 44 and extend outwards.

[0053] Please refer to Figure 8 , Figure 8 , which shows a partial cross-sectional view of the keyboard 8 of the fifth preferred specific embodiment. The keyboard 5 of the fifth preferred specific embodiment conforms to ergonomics.

[0054] As Figure 8 shown, the keyboard 5 of the fifth preferred specific embodiment of the present invention includes the membrane switch circuits (1, 2, 3, 4) of the above respective preferred specific embodiments. For convenience of description, in Figure 8Among them, only the membrane switch circuit 1 of the first preferred specific embodiment of the present invention is shown as a representative. The keyboard 5 of the fifth preferred specific embodiment of the present invention further includes a frame 50, a plurality of first keycaps 51, a plurality of second keycaps 52, a first bottom plate 53, a second bottom plate 54, a plurality of first elastic actuators 55, a plurality of second elastic actuators 56, a plurality of first lifting mechanisms 57, and a plurality of second lifting mechanisms 58.

[0055] The frame 50 includes a first key portion 500, a second key portion 502, and a connecting portion 504. The connecting portion 504 is connected between the first key portion 500 and the second key portion 502. The first key portion 500 corresponds to the first flexible main board 10. The second key portion 502 corresponds to the second flexible main board 12. The first key portion 500 has a plurality of through first openings 5002. The second key portion 502 has a plurality of second openings 5022. The connecting portion 504 has a curved surface that bends upward. Each first keycap 51 corresponds to a through first opening 5002 and is placed in its corresponding through first opening 5002. Each second keycap 52 corresponds to a through second opening 5022 and is placed in its corresponding through second opening 5022.

[0056] The first bottom plate 53 is fixed below the first bottom surface 5004 of the first key portion 500. The first flexible main board 10 is placed between the first key portion 500 and the first bottom plate 53 and is smoothly placed on the first upper surface 530 of the first bottom plate 53. The second bottom plate 54 is fixed below the second bottom surface 5024 of the second key portion 502. The second flexible main board 12 is placed between the second key portion 502 and the second bottom plate 54 and is smoothly placed on the second upper surface 540 of the second bottom plate 54. Each first elastic actuator 55 corresponds to a first keycap 51 and a first push switch 110. Each first elastic actuator 55 is disposed between its corresponding first keycap 51 and its corresponding first push switch 110. Each second elastic actuator 56 corresponds to a second keycap 52 and a second push switch 130. Each second elastic actuator 56 is disposed between its corresponding second keycap 52 and its corresponding second push switch 130. It should be emphasized that the first flexible strip connecting plate 14 will be distorted.

[0057] Each first lifting mechanism 57 corresponds to a first keycap 51. Each first lifting mechanism 57 is connected between the first base plate 53 and its corresponding first keycap 51. Each first lifting mechanism 57 restricts its corresponding first keycap 51 to move between a first un-pressed position and a first pressed position. There is a first gap between each first keycap 51 and the first inner wall of its corresponding through first opening 5002. It should be emphasized that each first keycap 51 does not touch the first inner wall of its corresponding through first opening 5002. When each first keycap 51 moves to the first pressed position, the first elastic actuator 55 corresponding to the first keycap 51 deforms to turn on its corresponding first push switch 110. When each first keycap 51 is released and moves to the first un-pressed position, the first elastic actuator 55 corresponding to the first keycap 51 resumes its first original shape to turn off its corresponding first push switch 110. Each second lifting mechanism 58 corresponds to a second keycap 52.

[0058] Each second lifting mechanism 58 is connected between its corresponding second keycap 52 and the second base plate 54. Each second lifting mechanism 58 restricts its corresponding second keycap 52 to move between a second un-pressed position and a second pressed position. There is a second gap between each second keycap 52 and the second inner wall of its corresponding through second opening 5022. It should be emphasized that each second keycap 52 does not touch the second inner wall of its corresponding through second opening 5022. When each second keycap 52 moves to the second pressed position, the second elastic actuator 56 corresponding to the second keycap 52 deforms to turn on its corresponding second push switch 130. When each second keycap 52 is released and moves to the second un-pressed position, the second elastic actuator 56 corresponding to the second keycap 52 resumes its second original shape to turn off its corresponding second push switch 130.

[0059] In a specific embodiment, also as Figure 8 shown, the frame 50 includes a plurality of hot melt posts 506. The plurality of hot melt posts 506 are formed on the first bottom surface 5004 of the first key portion 500 and the second bottom surface 5024 of the second key portion 502. The membrane switch circuit 1 also has a plurality of through holes 18 formed on the first flexible main board 10 and the second flexible main board 12. Each through hole 18 corresponds to a hot melt post 506. The first base plate 53 has a plurality of first coupling holes 532. Each first coupling hole 532 corresponds to a hot melt post 506. The second base plate 54 has a plurality of second coupling holes 542. Each second coupling hole 542 corresponds to a hot melt post 506. Each hot melt post 506 passes through its corresponding through hole 18, and the end 5062 of each hot melt post 506 is heat-melted to be coupled with its corresponding first coupling hole 532 or its corresponding second coupling hole 542.

[0060] In a specific embodiment, as also shown in Figure 8 , the lower-edge first opening 5003 in the plurality of through first openings 5002 is adjacent to the lower-edge second opening 5023 in the plurality of through second openings 5022. Figure 8 The partial cross-sectional view shown is the partial cross-sectional view at the lower-edge first opening 5003 and the lower-edge second opening 5023 of the keyboard 5 of the fifth preferred specific embodiment of the present invention. In Figure 8 , the first keycap 51 placed in the lower-edge first opening 5003 is implemented as the first long keycap 51a serving as a blank key, and the second keycap 52 placed in the lower-edge second opening 5023 is implemented as the second long keycap 52a serving as a blank key. The first long keycap 51a and the second long keycap 52a are adjacent. Thus, the two keys for the user's two thumbs to operate on the keyboard 5 of the fifth preferred specific embodiment of the present invention are adjacent, and the user does not need to bend the thumbs to operate these two keys.

[0061] The sixth preferred specific embodiment of the present invention is a method for manufacturing the keyboard 5 as shown in Figure 8 . First, prepare the thin-film switch circuit, frame, multiple keys, etc. of the present invention, and then assemble these components.

[0062] In an embodiment, first, prepare the thin-film switch circuit (1, 2, 3, or 4) of the present invention. For convenience of description, hereinafter, only the thin-film switch circuit 1 of the first preferred specific embodiment of the present invention is taken as an example.

[0063] Next, prepare the frame 50. The frame 50 includes a first key portion 500, a second key portion 502, and a connecting portion 504. The connecting portion 504 is connected between the first key portion 500 and the second key portion 502. The first key portion 500 corresponds to the first flexible main board 10. The second key portion 502 corresponds to the second flexible main board 12. The first key portion 500 has a plurality of through first openings 5002. The second key portion 502 has a plurality of second openings 5022. The connecting portion 504 has a curved surface that bends upward. The frame 50 includes a plurality of heat-melting posts 506. The plurality of heat-melting posts 506 are formed on the first bottom surface 5004 of the first key portion 500 and the second bottom surface 5024 of the second key portion 502. The thin-film switch circuit 1 also has a plurality of through holes 18 formed on the first flexible main board 10 and the second flexible main board 12. Each through hole 18 corresponds to a heat-melting post 506.

[0064] Next, prepare a plurality of first keycaps 51 and a plurality of second keycaps 52. Each first keycap 51 corresponds to a through first opening 5002. Each second keycap 52 corresponds to a through second opening 5022.

[0065] Next, prepare the first bottom plate 53 and the second bottom plate 54. The first bottom plate 53 has a plurality of first coupling holes 532. Each first coupling hole 532 corresponds to a heat fusion post 506. The second bottom plate 54 has a plurality of second coupling holes 542. Each second coupling hole 542 corresponds to a heat fusion post 506.

[0066] Next, prepare a plurality of first elastic actuators 55 and a plurality of second elastic actuators 56. Each first elastic actuator 55 corresponds to a first keycap 51 and a first push switch 110. Each second elastic actuator 56 corresponds to a second keycap 52 and a second push switch 130.

[0067] Next, prepare a plurality of first lifting mechanisms 57 and a plurality of second lifting mechanisms 58. Each first lifting mechanism 57 corresponds to a first keycap 51. Each second lifting mechanism 58 corresponds to a second keycap 52.

[0068] In the foregoing introduction, multiple steps are used to illustrate the preparation of the membrane switch circuits (1, 2, 3, or 4), the frame 50, and the plurality of first key structures and the plurality of second key structures, etc. Each key structure includes a first keycap, a first bottom plate, a plurality of first elastic actuators, a first lifting mechanism, etc. Each second key structure includes a second keycap, a second bottom plate, a plurality of second elastic actuators, a second lifting mechanism, etc. In actual operation, the preparation order of each component is not limited, and the user can determine the preparation order of each component according to actual needs. In addition, the architecture of each first key structure and each second key structure is not limited to the architecture of this embodiment.

[0069] Next, place the first flexible main board 10 smoothly on the first upper surface 530 of the first bottom plate 53.

[0070] Next, place the second flexible main board 12 smoothly on the second upper surface 540 of the second bottom plate 54.

[0071] Next, dispose each first elastic actuator 55 between its corresponding first keycap 51 and its corresponding first push switch 110.

[0072] Next, dispose each second elastic actuator 56 between its corresponding second keycap 52 and its corresponding second push switch 130.

[0073] Next, connect each first lifting mechanism 57 between its corresponding first keycap 51 and the first bottom plate 53. Each first lifting mechanism 57 restricts its corresponding first keycap 51 to move between a first non-pressed position and a first pressed position.

[0074] Next, each second lifting mechanism 58 is connected between its corresponding second keycap 52 and second base plate 54. Each second lifting mechanism 58 restricts its corresponding second keycap 52 to move between a second non-pressed position and a second pressed position.

[0075] Finally, each hot melt post 506 passes through its corresponding through hole 18 and the end 5062 of each hot melt post 506 is hot melted to be combined with its corresponding first combination hole 532 or its corresponding second combination hole 542, so that each first keycap 51 is placed in its corresponding penetrating first opening 5002, and each second keycap 52 is placed in its corresponding penetrating second opening 5022. There is a first gap between each first keycap 51 and the first inner wall of its corresponding penetrating first opening 5002. When each first keycap 51 moves to the first pressed position, the first elastic actuator 55 corresponding to the first keycap 51 deforms to turn on its corresponding first push switch 110. When each first keycap 51 is released and moves to the first non-pressed position, the first elastic actuator 55 corresponding to the first keycap 51 resumes its first original shape to turn off its corresponding first push switch 110. There is a second gap between each second keycap 52 and the second inner wall of its corresponding penetrating second opening 5022. When each second keycap 52 moves to the second pressed position, the second elastic actuator 56 corresponding to the second keycap 52 deforms to turn on its corresponding second push switch 130. When each second keycap 52 is released and moves to the second non-pressed position, the second elastic actuator 56 corresponding to the second keycap 52 resumes its second original shape to turn off its corresponding second push switch 130.

[0076] In the foregoing introduction, the assembly of the membrane switch circuit, multiple first key structures, multiple second key structures, the frame, etc. is introduced through multiple steps. In actual operation, the assembly order of each component is not limited, and the user can determine the assembly order of each component according to actual needs. After the assembly of each key structure, etc. is completed, it is only necessary to realize the combination of the hot melt posts on the frame and the combination holes on the base plate.

[0077] As described above, the first flexible main board of the membrane switch circuit of the present invention is placed between the first key part and the first base plate and is smoothly placed on the first upper surface of the first base plate, and the second flexible main board of the membrane switch circuit is placed between the second key part and the second base plate and is smoothly placed on the second upper surface of the second base plate. Therefore, the keyboard of the present invention conforms to ergonomics and all keycaps are flatly placed in the corresponding openings of the frame. Moreover, the two keys for the user's two thumbs to operate on the keyboard of the present invention are adjacent, and the user does not need to bend the thumbs to operate these two keys.

[0078] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention. However, these corresponding changes and modifications shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A membrane switch circuit board, suitable for a keyboard, characterized in that: The keyboard comprises a frame, the frame comprises a first key portion, a second key portion and a connecting portion connecting the first key portion and the second key portion, the connecting portion having an upwardly curved surface, and the membrane switch circuit board comprises: A first flexible main board, corresponding to the first button portion and having a first front edge, a first rear edge and a first side edge; A first circuit is formed on the first flexible main board and constitutes a plurality of first push switches; A second flexible main board corresponds to the second button portion and has a second front edge, a second rear edge and a second side edge, the second side edge faces the first side edge, a distance between the first side edge and the second side edge adjacent to the first front edge and the second front edge is defined as a first spacing, a distance between the first side edge and the second side edge adjacent to the first rear edge and the second rear edge is defined as a second spacing, and the first spacing is smaller than the second spacing; A second circuit is formed on the second flexible main board and constitutes a plurality of second push switches; A first flexible strip connecting plate connected between the first side edge and the second side edge and close to the first rear edge and the second rear edge, the first flexible strip connecting plate comprising a first curved portion extending toward the first front edge; as well as The third circuit is formed on the first flexible strip connection board and is electrically connected to the first circuit and the second circuit.

2. The membrane switch circuit board according to claim 1, characterized in that: The membrane switch circuit board further comprises: At least one second flexible strip connecting plate connected between the first side edge and the second side edge and close to the first front edge and the second front edge, each second flexible strip connecting plate comprising a second curved portion, and the second curved portion of each second flexible strip connecting plate extending toward the first rear edge; as well as The fourth circuit is formed on the at least one second flexible strip connection board and is electrically connected to the first circuit and the second circuit.

3. A membrane switch circuit board, suitable for a keyboard, characterized in that: The keyboard comprises a frame, the frame comprises a first key portion, a second key portion and a connecting portion connecting the first key portion and the second key portion, the connecting portion having an upwardly curved surface, and the membrane switch circuit board comprises: A first flexible main board, corresponding to the first button portion and having a first front edge, a first rear edge and a first side edge; A first circuit is formed on the first flexible main board and constitutes a plurality of first push switches; A second flexible main board corresponds to the second button portion and has a second front edge, a second rear edge and a second side edge, the second side edge faces the first side edge, a distance between the first side edge and the second side edge adjacent to the first front edge and the second front edge is defined as a first spacing, a distance between the first side edge and the second side edge adjacent to the first rear edge and the second rear edge is defined as a second spacing, and the first spacing is smaller than the second spacing; A second circuit is formed on the second flexible main board and constitutes a plurality of second push switches; A flexible connecting plate connected between the first side and the second side, the flexible connecting plate having a plurality of holes; as well as The third circuit is formed on the flexible connection board and is electrically connected to the first circuit and the second circuit.

4. A membrane switch circuit board, suitable for a keyboard, characterized in that: The keyboard comprises a frame, the frame comprises a first key portion, a second key portion and a connecting portion connecting the first key portion and the second key portion, the connecting portion having an upwardly curved surface, and the membrane switch circuit board comprises: A first flexible main board, corresponding to the first button portion and having a first front edge, a first rear edge and a first side edge; A first circuit is formed on the first flexible main board and constitutes a plurality of first push switches; A second flexible main board corresponds to the second button portion and has a second front edge, a second rear edge and a second side edge, the second side edge faces the first side edge, a distance between the first side edge and the second side edge adjacent to the first front edge and the second front edge is defined as a first spacing, a distance between the first side edge and the second side edge adjacent to the first rear edge and the second rear edge is defined as a second spacing, and the first spacing is smaller than the second spacing; A second circuit is formed on the second flexible main board and constitutes a plurality of second push switches; A plurality of flexible strip-shaped connecting plates are connected between the first side and the second side, and at least one of the plurality of flexible strip-shaped connecting plates has a plurality of holes; as well as The third circuit is formed on at least one of the plurality of flexible strip connection boards and is electrically connected to the first circuit and the second circuit.

5. A membrane switch circuit board, suitable for a keyboard, characterized in that: The keyboard comprises a frame, the frame comprises a first key portion, a second key portion and a connecting portion connecting the first key portion and the second key portion, the connecting portion having an upwardly curved surface, and the membrane switch circuit board comprises: A first flexible main board, corresponding to the first button portion and having a first front edge, a first rear edge and a first side edge; A first circuit is formed on the first flexible main board and constitutes a plurality of first push switches; A second flexible main board corresponds to the second button portion and has a second front edge, a second rear edge and a second side edge, the second side edge faces the first side edge, a distance between the first side edge and the second side edge adjacent to the first front edge and the second front edge is defined as a first spacing, a distance between the first side edge and the second side edge adjacent to the first rear edge and the second rear edge is defined as a second spacing, and the first spacing is smaller than the second spacing; A second circuit is formed on the second flexible main board and constitutes a plurality of second push switches; a flexible connecting plate connected between the first side and the second side, the flexible connecting plate having a third front edge and a third rear edge, the third front edge being on the same side as the first front edge and the second front edge, the third rear edge being on the same side as the first rear edge and the second rear edge, the flexible connecting plate having a first notch, a second notch and a broken hole, the first notch being formed on the third front edge and extending toward the third rear edge, the second notch being formed on the third rear edge and extending toward the third front edge, and the broken hole being formed between the first notch and the second notch; as well as The third circuit is formed on the flexible connection board and is electrically connected to the first circuit and the second circuit.

6. The membrane switch circuit board according to claim 5, characterized in that: The flexible connecting plate also has a plurality of through slots, which are formed around the hole and extend outward.

7. A keyboard, characterized in that Include: The membrane switch circuit according to any one of claims 1 to 6; The frame comprises a first button portion, a second button portion and a connecting portion, wherein the connecting portion is connected between the first button portion and the second button portion, the first button portion corresponds to the first flexible mainboard, the second button portion corresponds to the second flexible mainboard, the first button portion has a plurality of first openings extending therethrough, the second button portion has a plurality of second openings extending therethrough, and the connecting portion has a curved surface extending upward; A plurality of first key structures are arranged corresponding to the plurality of penetrating first openings; as well as A plurality of second key structures are arranged corresponding to the plurality of penetrating second openings.

8. The keyboard according to claim 7, wherein: The plurality of first key structures and the plurality of second key structures include: A plurality of first keycaps, each of which corresponds to a through first opening and is placed in the corresponding through first opening; A plurality of second keycaps, each second keycap corresponds to a through second opening and is placed in the corresponding through second opening; A first bottom plate is fixed below the first bottom surface of the first button portion, wherein the first flexible main board is placed between the first button portion and the first bottom plate and is smoothly placed on the first upper surface of the first bottom plate; as well as A second bottom plate is fixed below the second bottom surface of the second button portion, wherein the second flexible main board is placed between the second button portion and the second bottom plate and is smoothly placed on the second upper surface of the second bottom plate; There is a first gap between each first keycap and the corresponding first inner wall of the first opening passing through it, and there is a second gap between each second keycap and the corresponding second inner wall of the second opening passing through it.

9. The keyboard according to claim 8, wherein: The frame includes a plurality of hot melt posts, which are formed on the first bottom surface of the first button part and the second bottom surface of the second button part. The membrane switch circuit also has a plurality of through holes formed on the first flexible main board and the second flexible main board, each through hole corresponds to a hot melt post, the first bottom plate has a plurality of first combining holes, each first combining hole corresponds to a hot melt post, the second bottom plate has a plurality of second combining holes, each second combining hole corresponds to a hot melt post, each hot melt post passes through the corresponding through hole and its end is hot-melted to be combined with the corresponding first combining hole or the corresponding second combining hole.

10. The keyboard according to claim 7, wherein: A lower edge first opening among the plurality of through first openings is adjacent to a lower edge second opening among the plurality of through second openings.

11. A method for manufacturing a keyboard, characterized in that It includes the following steps: A membrane switch circuit, a frame, and a plurality of first key structures and a plurality of second key structures according to any one of claims 1 to 6 are prepared, wherein the frame comprises a first key portion, a second key portion, and a connecting portion, wherein the connecting portion is connected between the first key portion and the second key portion, wherein the first key portion corresponds to the first flexible mainboard, and the second key portion corresponds to the second flexible mainboard, wherein the first key portion has a plurality of first openings extending therethrough, and the second key portion has a plurality of second openings extending therethrough, and the connecting portion has a curved surface that curves upward; The plurality of first key structures are assembled corresponding to the plurality of first through openings, and the plurality of second key structures are assembled corresponding to the plurality of second through openings.

12. The method for manufacturing a keyboard according to claim 11, characterized in that: The plurality of first key structures and the plurality of second key structures include a plurality of first key caps, a plurality of second key caps, a first base plate and a second base plate. Assembling the plurality of first keys and the plurality of second keys includes: Each first keycap corresponds to a through first opening and is placed in its corresponding through first opening; each second keycap corresponds to a through second opening and is placed in its corresponding through second opening; the first base plate is fixed below the first bottom surface of the first button part, the first flexible main board is placed between the first button part and the first base plate and is smoothly placed on the first upper surface of the first base plate; the second base plate is fixed below the second bottom surface of the second button part, wherein the second flexible main board is placed between the second button part and the second base plate and is smoothly placed on the second upper surface of the second base plate; wherein a first gap exists between each first keycap and the first inner wall of the through first opening corresponding to it, and a second gap exists between each second keycap and the second inner wall of the through second opening corresponding to it.

13. The method for manufacturing a keyboard according to claim 12, wherein: The frame further comprises a plurality of hot melt posts, which are formed on the first bottom surface of the first key portion and the second bottom surface of the second key portion. The membrane switch circuit further comprises a plurality of through holes formed on the first flexible main board and the second flexible main board, each through hole corresponding to a hot melt post. The first bottom plate comprises a plurality of first combining holes, each of which corresponds to a hot melt post. The second bottom plate comprises a plurality of second combining holes, each of which corresponds to a hot melt post. The method for manufacturing the keyboard further comprises: Each heat-melting column is passed through the corresponding through hole and the end thereof is heat-melted to be combined with the corresponding first combining hole or the corresponding second combining hole.

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