TW202223952A - Keyboard and base plate thereof - Google Patents

Abstract

A keyboard device includes a base plate and keycaps. The substrate includes a first plate, a second plate, and at least one elastic component. The first plate and the second plate are separated from each other by an elongated groove, and can be moved away from or close to each other in a first direction through the elastic component. The elongated groove extends gradually along the second direction. Each elastic assembly includes two recursive arms, the two recursive arms are arranged oppositely in the elongated groove, and each recursive arm connects the first plate and the second plate, thereby dividing the elongated groove into two narrow groove portions and an H-shaped groove portion. Each recursive arm has a revolving free end. The two recursive free ends of the two recursive arms are opposite to each other. The H-shaped groove portion is located between the two recursive free ends of the two recursive arms. Each narrow groove portion extends into a side of each reversing arm away from the H-shaped groove portion. The keyboard and the base plate thereof have the advantage of flexibly positioning and assembling the base plate onto a device housing.

Description

keyboard and its substrate

The present invention relates to an input device, in particular to a keyboard.

As far as the current usage habits of desktop computers, notebook computers, smart phones or tablet computers are concerned, keyboards are one of the indispensable input devices for inputting words, symbols or numbers. The keyboard is mainly composed of a base plate and a plurality of keys. Generally speaking, the keyboard is positioned at a predetermined position on the device casing, and is connected and fixed by multiple sets of structures on the keyboard base plate and the device casing that can be mutually butted together. However, there will be tolerances in mass production of the device casing and the substrate, resulting in one or more relative offsets of the multiple groups of structures that should be matched, which makes the keyboard difficult to assemble or the assembled structure is skewed.

The present invention provides a keyboard, which can avoid the situation that it is difficult to assemble or the structure is skewed after assembling.

The keyboard provided by the embodiments of the present invention includes a substrate and a plurality of keycaps. The key caps are arranged opposite to the base plate, and each key cap is pressed to move back and forth relative to the base plate. The base plate includes a first plate, a second plate and at least one elastic component, the first plate and the second plate are separated from each other by an elongated slot, and can be separated from or approached each other along a first direction through the elastic component, and the elongated slot Gradually extending along the second direction, each elastic component includes two recursive arms, the two recursive arms are oppositely arranged in the elongated slot, and each recursive arm connects the first plate and the second plate, thereby dividing the elongated slot to form two narrow slots and an H-shaped groove, each recursive arm has a free end, the two free ends of the two recursive arms are opposite to each other, and the H-shaped groove is located between the two free ends of the recursive arms, and each narrow The slot portion extends into a side of each recursive arm remote from the H-shaped slot portion.

Embodiments of the present invention also provide a substrate for a keyboard. The base plate includes a first plate, a second plate and at least one elastic component. The first plate and the second plate are separated from each other by an elongated slot, and can be separated or approached from each other along a first direction through the elastic component. The elongated slot Gradually extending along the second direction, each elastic component includes two recursive arms, the two recursive arms are oppositely arranged in the elongated slot, and each recursive arm connects the first plate and the second plate, thereby dividing the elongated slot to form two narrow slots and an H-shaped groove, each recursive arm has a free end, the two free ends of the two recursive arms are opposite to each other, and the H-shaped groove is located between the two free ends of the recursive arms, and each narrow The slot portion extends into a side of each recursive arm remote from the H-shaped slot portion.

In an embodiment of the present invention, the first plate has a first side adjacent to the elongated slot, the second plate has a second side adjacent to the elongated slot, the second side and the first side Oppositely, the first side is provided with two first base frames, the first base frame protrudes towards the second side edge, the second side is provided with two second base frames, the second base frame protrudes towards the first side edge, The two second base frames are respectively opposite to and spaced apart from the two first base frames, each recursive arm has a first end and a second end opposite to each other, the free end of the loop is located between the first end and the second end, and the two recursive arms The two first ends of the arms are respectively connected with the two first base frames, and the two second ends of the two recursive arms are respectively connected with the two second base frames.

In an embodiment of the present invention, the first end of each of the recurring arms has opposite first side edges and second side edges, and there is a first distance between the first side edge and the second side edge. The first spacing of the return arms is gradually increased from the revolving free ends of the return arms to the first base frames, the second ends of the return arms have opposite third side edges and fourth side edges, and the third side edges are connected with each other. There is a second distance between the fourth side edges, and the second distance of each recursive arm gradually increases from the return free end of each recursive arm to each second base frame.

In an embodiment of the present invention, in each recurring arm, the second side edge and the fourth side edge are parallel to each other, the first side edge is located between the second side edge and the first side edge, and the third side edge is located between the second side edge and the first side edge. The side edge is located between the fourth side edge and the second side edge, the first side edge of each recursive arm extends obliquely from the revolving free end of each recursive arm to each first base frame, and the third side of each recursive arm The reason is that the revolving free ends of each recurring arm extend obliquely toward each second base frame.

In an embodiment of the present invention, the first end of each recursive arm has a first curved edge, the second end of each recursive arm has a second curved edge, and each first base frame has a third curved edge , the third curved edge of each first base frame is connected with the first curved edge of the first end of each recursive arm, and each second base frame has a fourth curved edge, and the fourth curved edge of each second base frame is connected to The second curvilinear edges of the second ends of each recursive arm are connected.

In an embodiment of the present invention, the third curved edge of each first base frame and the first curved edge to which it is connected have the same radius of curvature, and the fourth curved edge of each second base frame and the second curved edge to which it is connected have the same radius of curvature. Curved edges have the same radius of curvature.

In an embodiment of the present invention, the revolving free ends of the aforementioned recurring arms have an outer edge, the outer edge has two side sections and a middle section, the middle section of the outer edge is connected between the two side sections of the outer edge, and the outer edge has a middle section. A fifth curved edge is formed between the middle section of the outer edge and each side section of the outer edge.

In an embodiment of the present invention, the revolving free ends of the aforementioned recurring arms have an inner edge, the inner edge has two side sections and a middle section, the middle section of the inner edge is connected between the two side sections of the inner edge, and the inner edge has a middle section. A sixth curved edge is formed between the middle section of the inner edge and the two side ends of the inner edge.

In an embodiment of the present invention, the first direction is the long axis direction of the substrate, and the second direction is the short axis direction of the substrate.

In the keyboard of the present invention, during the relative movement of the first plate and the second plate, the return arm of the elastic component will be force-linked to produce elastic deformation, so that after the first plate and the second plate move relative to each other, the elastic The components can still be continuously connected to the first plate and the second plate to avoid separation. Accordingly, when the device casing is assembled to the base plate and is sleeved on the keycap, the distance between the first plate and the second plate can be adjusted according to the positioning column on the device casing, eliminating the progressive tolerance in manufacturing (for example, The substrate, keycap or other components are produced with tolerances during manufacture), so as to elastically position and assemble the substrate and the device casing, so as to avoid the problem that the keyboard is not easy to be assembled or the structure is skewed after assembly.

In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious and easy to understand, the following specific embodiments are given and described in detail in conjunction with the accompanying drawings.

FIG. 1A is a schematic perspective view of a keyboard according to an embodiment of the present invention. 1B is a schematic cross-sectional view of a keyboard according to an embodiment of the present invention. FIG. 2 is a schematic diagram of some components of a keyboard according to an embodiment of the present invention. FIG. 3 is a top view of the substrate shown in FIG. 2 . FIG. 4 is an enlarged schematic view of the area A in FIG. 3 . FIG. 5 is an enlarged schematic view of region B in FIG. 4 . As shown in FIGS. 1A to 5 , a keyboard 1 according to an embodiment of the present invention can be applied to a device casing 3 of an electronic device 2 such as a notebook computer or an independent keyboard. The keyboard 1 includes a substrate 100 and a plurality of keys 200 arranged oppositely. As shown in FIG. 1B , each key 200 may include, for example, a key cap 210 located at the top, a pair of brackets 220 that can stand or collapse, a reset member 230 that provides elastic restoring force, and a key cap 210 is pressed by an external force. Switch circuits (not shown) that are triggered indirectly or directly, etc., a plurality of switch circuits corresponding to each key 200 can be integrated into a single-layer or multi-layer thin-film circuit board 240; And after triggering the circuit switch, it moves away from the substrate 100 and returns to the highest position. The substrate 100 includes a first plate 101, a second plate 102 and at least one elastic component 104. The first plate 101 and the second plate 102 are separated from each other by an elongated slot 105, and the first plate 101 and the second plate 102 are elastically separated from each other. The components 104 may move away from or approach each other along the first direction D1, and the elongated slots 105 extend gradually along the second direction D2. Each elastic component 104 includes two recursive arms 110, the two recursive arms 110 are oppositely arranged in the elongated slot 105, and each recursive arm 110 connects the first plate 101 and the second plate 102, thereby dividing the elongated slot 105 to form two narrow The groove portion 106 and an H-shaped groove portion 107 , each recursive arm 110 has a revolving free end 120 , the two revolving free ends 120 of the two recurring arms 110 are opposite to each other, and the H-shaped groove portion 107 is located at two of the two recurring arms 110 Rewind between the free ends 120 , and each narrow groove portion 106 extends into a side of each recursive arm 110 away from the H-shaped groove portion 107 .

The above-mentioned key cap 200 may include a plurality of letter keys, a plurality of numeric keys, a space key (Space key), an input key (Enter key), etc. The present invention does not limit the type and quantity of the key cap 200 . In addition, in this embodiment, the substrate 100 can be a rigid plate body made of a metal material (eg, iron, aluminum or alloy, etc.) or a plastic material. When the keycap 200 is pressed, it can move back and forth relative to the substrate 100 to generate a corresponding signal. For example, the keycap 200 can be assembled on the substrate 100 through a lift connector (not shown), such as a scissor connector and an elastic element (such as an elastic rubber, an elastic sheet or a mechanical switch) ), etc., the present invention does not limit the type of the lifting connector. In addition, in this embodiment, the above-mentioned first direction D1 is the long-axis direction of the substrate 100 , and the second direction D2 is the short-axis direction of the substrate 100 , but in other embodiments, the first direction D1 may be the substrate 100 . The short axis direction of and the second direction D2 may be the long axis direction of the substrate 100 .

FIG. 6 is a schematic diagram of the operation of the elastic component of the substrate according to an embodiment of the present invention. As shown in FIGS. 5 and 6 , by means of the elastic element 104 , the first plate 101 and the second plate 102 of the substrate 100 can move relative to each other along the first direction D1 to adjust the relative positions and maintain connection. For example, when the first plate 101 and the second plate 102 move relative to each other in the opposite direction along the first direction D1, the distance between the revolving free end 120 of each recursive arm 110 and the first plate 101 and the second plate 102 increases ( Each recursive arm 110 is elongated along the first direction D1 ), while the widths of the H-shaped groove portion 107 and the narrow groove portion 106 of the long groove 105 are increased. That is to say, during the relative movement of the first plate 101 and the second plate 102, the recursive arm 110 of the elastic component 104 will be forcefully linked to produce elastic deformation, so that after the first plate 101 and the second plate 102 move, The elastic component 104 can continue to connect the first plate 101 and the second plate 102 to avoid separation. Accordingly, when the substrate 100 is assembled to the device casing and the keycaps 200 are exposed, the position between the first plate 101 and the second plate 102 can be adjusted according to the positioning column (not shown) on the device casing 3 . The distance, eliminates progressive tolerances in manufacturing (for example, the substrate 100 , the keycap 200 or other components are manufactured with tolerances) to avoid the problem of uneven clearance between the keycap 200 and the device housing 3 .

The above-mentioned first plate 101 also has a first side S1 adjacent to the elongated slot 105, and the above-mentioned second plate 102 has a second side S2 adjacent to the elongated slot 105. The second side S2 is connected to the first side S2. The sides S1 are opposite, the first side S1 is provided with two first base frames 108, the first base frame 108 protrudes toward the second side S2, the second side S2 is provided with a second base frame 109, the second base frame 109 protrudes toward the first side edge S1, the two second base frames 109 and the two first base frames 108 are respectively opposite to and spaced apart from each other, each recursive arm 110 has an opposite first end 130 and a second end 140, and wraps around the free end 120 is located between the first end 130 and the second end 140, the two first ends 130 of the two recursive arms 110 are respectively connected to the two first base frames 108, and the two second ends 140 of the two recursive arms 110 are respectively connected to the two first bases 108. The two base frames 109 are connected. When the first plate 101 and the second plate 102 move relative to each other in the opposite direction along the first direction D1, the distance between the first side S1 and the second side S2 increases, and the connection between each recursive arm 110 and the first side S1 and the The distance between the connection between each recursive arm 110 and the second side S2 is increased, and the width of the H-shaped groove portion 107 and the narrow groove portion 106 of the long groove 105 is increased at the same time.

The first end 130 of each recursive arm 110 described above has a first side edge 131 and a second side edge 132 opposite to each other, and there is a first distance between the first side edge 131 and the second side edge 132 . The first spacing increases gradually from the revolving free end 120 of each recursive arm 110 to each first base frame 108 , and the second end 140 of each recurring arm 110 has opposite third side edges 141 and fourth side edges 142 . There is a second distance between the third side edge 141 and the fourth side edge 142 , and the second distance of each recursive arm 110 gradually increases from the revolving free end 120 of each recursive arm 110 to each second base frame 109 .

In addition, in each of the aforementioned recursive arms 110, the second side edge 132 and the fourth side edge 142 are parallel to each other, the first side edge 131 is located between the second side edge 132 and the first side edge S1, and the third side edge 131 is located between the second side edge 132 and the first side edge S1. The edge 141 is located between the fourth side edge 142 and the second side edge S2, and the first side edge 131 of each recursive arm 110 extends obliquely from the revolving free end 120 of each recursive arm 110 to each first base frame 108, The third side edge 141 of each recursive arm 110 extends obliquely from the free end 120 of each recursive arm 110 to each second base frame 109 . For example, in some embodiments, the first end 130 and the second end 140 of each recursive arm 110 are slightly trapezoidal, but the invention is not limited thereto.

FIG. 7 is an enlarged schematic view of the C area in FIG. 5 . As shown in FIGS. 4 , 5 and 7 , the first end 130 of each recursive arm 110 also has a first curved edge C1 , and the second end 140 of each recursive arm 110 has a second curved edge C2 . A base frame 108 has a third curved edge C3, the third curved edge C3 of each first base frame 108 is connected to the first curved edge C1 of the first end 130 of each recursive arm 110, and each second base frame 109 has A fourth curved edge C4, the fourth curved edge C4 of each second base frame 109 is connected with the second curved edge C2 of the second end 140 of each recursive arm 110. In this embodiment, the third curved edge C3 of each first base frame 108 and the first curved edge C1 to which it is connected have the same curvature radius, and the fourth curved edge C4 of each second base frame 109 and the first curved edge C4 to which it is connected have the same curvature radius. The two curved edges C2 have the same curvature radius, but in some embodiments, the third curved edge C3 of each first base frame 108 and the first curved edge C1 to which it is connected may also have different and same curvature radii, and each second base frame 108 may also have the same curvature radius. The fourth curved edge C4 of the shelf 109 and the second curved edge C2 to which it is connected have different radii of curvature. Through the design of the first curved edge C1 , the second curved edge C2 , the third curved edge C3 and the fourth curved edge C4 , the junctions of each recursive arm 110 with the first base frame 108 and the second base frame 109 can be reduced. The degree of stress concentration is high, so as to avoid the situation where each recursive arm 110 is connected with the first base frame 108 and the second base frame 109 to be broken. In addition, in this embodiment, the first curvilinear edge C1 of the first end 130 of each recursive arm 110 is connected between the first side edge 131 and the third curvilinear edge C3, and the second end of each recursive arm 110 The second curved edge C2 of 140 is connected between the third side edge 141 and the third curved edge C3.

FIG. 8 is an enlarged schematic view of the C area in FIG. 5 . As shown in FIGS. 4 , 5 and 8 , the revolving free ends 120 of the aforementioned recurring arms 110 also have an outer edge 121 and an inner edge 125 , the outer edge 121 has two side sections 122 and a middle section 123 , and the middle section 123 is connected to both sides A fifth curved edge C5 is formed between the segments 122 and between the middle segment 123 and each side segment 122; the inner edge 125 and the outer edge 121 are opposite to each other, the inner edge 125 has two side segments 126 and a middle segment 127, and the middle segment 126 is connected to both sides A sixth curved edge C6 is formed between the segments 127 and between the middle segment 126 and each side segment 127 . The design of the fifth curved edge C5 and the sixth curved edge C6 can reduce the stress concentration on the revolving free end 120 of each recursive arm 110 , thereby preventing the circumstance that the revolving free end 120 of each recurring arm 110 is broken. In addition, in this embodiment, the two side segments 122 of the outer edge 121 are respectively connected with the first side edge 131 and the third side edge 141 , and the two side segments 126 of the inner edge 125 are respectively connected with the second side edge 132 and the fourth side edge 141 . Edge 142 is connected.

In addition, in this embodiment, as shown in FIGS. 2 to 4 , the substrate 100 may have a plurality of elastic elements 104 , the elastic elements 104 are arranged in the elongated grooves 105 at intervals, and the elongated grooves 105 are separated to form a plurality of narrow groove portions 106 and a plurality of H-shaped groove parts 107, each H-shaped groove part 107 is located between two adjacent narrow groove parts 106, and the narrow groove part 106 located between two adjacent H-shaped groove parts 107 has two longitudinal sections P and transverse sections Q, which are connected between longitudinal sections P, and which extend in the first direction D1, each longitudinal section P extending in the second direction D2 into the return arm 110 adjacent thereto On one side away from the H-shaped groove portion 107 , the specific number of the elastic components 104 can be adjusted according to requirements, which is not limited in the present invention. In addition, the substrate 100 may include a third plate 103 , the first plate 101 , the second plate 102 and the third plate 103 are arranged in sequence along the first direction D1 , and an elongated slot also passes between the second plate 102 and the third plate 103 105 and are separated from each other, the second plate 102 and the third plate 103 can move away from or approach each other along the first direction D1 through the elastic element 104, the elongated groove 105 gradually extends along the second direction D2, the second plate 102 and the third plate 103 The elastic elements 104 can also be separated from or approached each other along the first direction D1. In addition, in this embodiment, the elongated groove and the elastic element, etc. can be formed on the substrate by punching, but the present invention does not limit the formation of the elongated groove and the elastic element.

In the keyboard 1 of the embodiment of the present invention, during the relative movement of the first plate 101 and the second plate 102, the recursive arm 110 of the elastic component 104 will be force-linked to generate elastic deformation, so that the first plate 101 and the second plate 102 are connected with each other. After the two plates 102 move relative to each other, the elastic element 104 can continue to connect the first plate 101 and the second plate 102 to avoid separation. Accordingly, when the device casing 3 is assembled on the base plate 100 and is sleeved on the keycap 200, the distance between the first plate 101 and the second plate 102 can be adjusted according to the positioning column on the device casing 3, eliminating the need for manufacturing Progressive tolerances (for example, the substrate 100, the keycap 200 or other components are produced with tolerances during manufacture), so as to elastically position and assemble the substrate 100 and the device housing 3, so as to avoid the problem that the keyboard 1 is not easy to assemble or the structure is skewed after assembly.

Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope of the appended patent application. In addition, the terms such as "first", "second", "third", "fourth", "fifth", "sixth" mentioned in this specification or the scope of the patent application are only used to name elements. ) names or to distinguish between different embodiments or ranges, and are not used to limit the upper or lower limit of the number of elements.

1: Keyboard 2: Electronic device 3: Device housing 100: Substrate 101: The first plate 102: Second Plate 103: The third plate 104: Elastic Components 105: Long slot 106: Narrow groove part 107: H-shaped groove 108: The first base frame 109: Second Pedestal 110: Recursive arm 120: rewind free end 121: Outside edge 122: Side Section 123: middle section 125: inside edge 126: Side Section 127: middle section 130: First End 131: First side edge 132: Second side edge 140: Second End 141: Third side edge 142: Fourth side edge 200: key 210: keycap 220: Bracket 230: Elastic 240: Thin Film Circuit Board A: area B: area C: area D: area C1: The first curve edge C2: Second Curve Edge C3: Third Curve Edge C4: Fourth Curve Edge C5: Fifth Curve Edge C6: Sixth Curve Edge D1: first direction D2: Second direction S1: first side S2: Second side P: Longitudinal section Q: Horizontal section

1A is a schematic perspective view of a keyboard according to an embodiment of the present invention; 1B is a schematic cross-sectional view of a keyboard according to an embodiment of the present invention; 2 is a schematic diagram of some components of a keyboard according to an embodiment of the present invention; Figure 3 is a top view of the substrate shown in Figure 2; Fig. 4 is the enlarged schematic diagram of A area in Fig. 3; Fig. 5 is the enlarged schematic diagram of B region in Fig. 4; 6 is a schematic diagram of the operation of the elastic component of the substrate according to an embodiment of the present invention; FIG. 7 is an enlarged schematic view of the C region in FIG. 5; and FIG. 8 is an enlarged schematic view of the D region in FIG. 5 .

101: The first plate

102: Second Plate

104: Elastic Components

105: Long slot

106: Narrow groove part

107: H-shaped groove

110: Recursive arm

120: rewind free end

130: First End

140: Second End

A: area

B: area

D1: first direction

D2: Second direction

S1: first side

S2: Second side

P: Longitudinal section

Q: Horizontal section

Claims (10)

A keyboard comprising: a substrate; and A plurality of key caps are arranged opposite to the base plate, and each of the key caps is pressed to move back and forth relative to the base plate; Wherein, the base plate includes a first plate, a second plate and at least one elastic element, the first plate and the second plate are separated from each other by an elongated slot, and can be moved along the at least one elastic element through the at least one elastic element. A first direction is away from or close to each other, the elongated slot is gradually extended along a second direction, and each of the at least one elastic component includes two recursive arms, the two recursive arms are oppositely arranged in the elongated slot and each of the two The return arm connects the first plate and the second plate, so as to divide the long slot to form two narrow grooves and an H-shaped groove. The two revolving free ends are opposite to each other, and the H-shaped groove portion is located between the two revolving free ends of the two recursive arms, and each of the two narrow groove portions extends into each of the two recurring arms and away from the H-shaped groove portion one side. The keyboard of claim 1, wherein the first plate has a first side adjacent to the elongated slot, the second plate has a second side adjacent to the elongated slot, the second side The side is opposite to the first side, the first side is provided with two first base frames, the two first base frames protrude toward the second side side, and the second side is provided with two second base frames, The two second base frames protrude toward the first side edge, the two second base frames and the two first base frames are respectively opposite to and spaced apart from each other, and each of the two recursive arms has an opposite first end and a first Two ends, the free end is located between the first end and the second end, the two first ends of the two recursive arms are respectively connected with the two first base frames, the two second ends of the two recursive arms The two ends are respectively connected with the two second base frames. The keyboard of claim 2, wherein the first end of each of the return arms has a first side edge and a second side edge opposite to each other, and there is a The first spacing, the first spacing of each of the recurring arms is gradually increased from the revolving free end of each of the recurring arms to each of the first base frames, and the second end of each of the recurring arms has an opposite first spacing. There are three side edges and a fourth side edge. There is a second distance between the third side edge and the fourth side edge. The second distance of each return arm is determined by the return free end of each return arm. Gradually increase toward each of the second bases. The keyboard of claim 3, wherein, in each of the return arms, the second side edge and the fourth side edge are parallel to each other, and the first side edge is located between the second side edge and the first side edge and the third side edge is located between the fourth side edge and the second side edge, the first side edge of each return arm is directed from the revolving free end of each return arm to each first side edge The base frame extends obliquely, and the third side edge of each recurring arm extends diagonally toward each second base frame from the revolving free end of each recurring arm. The keyboard of claim 2, wherein the first end of each of the return arms has a first curved edge, and the second end of each of the return arms has a second curved edge, and the first base The frame has a third curved edge, the third curved edge of each of the first base frames is connected with the first curved edge of the first end of each of the return arms, and each of the second base frames has a fourth A curved edge, the fourth curved edge of each of the second base frames is connected with the second curved edge of the second end of each of the recurring arms. The keyboard of claim 5, wherein the third curved edge of each of the first base frames and the first curved edge to which it is connected have the same radius of curvature, and the fourth curved edge of each of the second base frames has the same radius of curvature as the first curved edge to which it is connected. The connected second curved edges have the same radius of curvature. The keyboard as claimed in claim 1, wherein the revolving free end of each of the return arms has an outer edge, the outer edge has two side sections and a middle section, the middle section is connected between the two side sections, and the middle section A fifth curved edge is formed between each of the two side segments. The keyboard as claimed in claim 1, wherein the revolving free end of each of the return arms has an inner edge, the inner edge has two side sections and a middle section, the middle section is connected between the two side sections, and the middle section A sixth curved edge is formed between each of the two side ends. The keyboard of claim 1, wherein the first direction is a long axis direction of the substrate, and the second direction is a short axis direction of the substrate. A base plate for a keyboard, comprising a first plate, a second plate and at least one elastic component, the first plate and the second plate are separated from each other by an elongated slot, and the at least one elastic component is passed between the first plate and the second plate The elongated grooves can be moved away from or approached each other along a first direction. The elongated grooves extend gradually along a second direction. Each of the at least one elastic element includes two recursive arms. The two recursive arms are oppositely disposed in the elongated grooves. Each of the two recursive arms is connected to the first plate and the second plate, thereby dividing the long groove to form two narrow grooves and an H-shaped groove. The two revolving free ends of the return arm are opposite to each other, and the H-shaped groove portion is located between the two revolving free ends of the two recurring arms, and each of the two narrow groove portions extends into each of the two recurring arms away from the H one side of the groove.

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