TWM515673U - Foldable expanding keyboard - Google Patents

Description

Folding expansion keyboard

The present invention relates to an expansion device for an electronic device, and more particularly to a folding expansion keyboard.

With the advancement of technology, portable electronic products (such as smart phones, tablets or PDAs) are also becoming more and more popular. Compared with traditional desktop computers, portable electronic products have the advantages of small size and light weight. And easy to carry. However, for editors, portable electronic products are mostly implemented using a virtual keyboard that is displayed on the screen. Since the screen and the virtual keyboard of the portable electronic product are small, it is very difficult to operate and is easy to input errors, which is inconvenient for a user who needs a large amount of text input and editing. In addition, the virtual keyboard will block most of the screen range, which is not conducive to user viewing and operation.

In view of this, most people will purchase a set of external physical keyboards. When text input and editing are required, the external physical keyboard can be connected with the portable electronic product, which makes the operation more convenient and fast. However, when the user goes out, the user must carry the external physical keyboard and the portable electronic device respectively, and the general external physical keyboard is relatively large in size, which causes inconvenience in carrying. Therefore, how to make the external physical keyboard more convenient to carry, and when used with portable electronic products, it can be more user-friendly, and the users are looking forward to it, which is also the goal and direction that the relevant industry needs to work hard to develop.

In view of the above problems, in one embodiment, a foldable expansion keyboard is provided, including a folding keyboard and a foldable cover. The folding keyboard includes a first board body, a second board body and a first flexible piece. The first board body is provided with a first keyboard part, and the second board body is provided with a second keyboard part. The first flexible piece is connected to the first keyboard piece. Between the first plate body and the second plate body, the first plate body and the second plate body are selectively covered or unfolded relative to each other. The first plate further includes a side edge and a second flexible piece. The side edge is located on an adjacent side of the first plate body with the first flexible piece, and the second flexible piece extends from the side edge. . The foldable cover is connected to the second flexible piece, so that the foldable cover can be selectively closed or unfolded relative to the first plate. The foldable cover comprises a main plate, a support plate and a fold line, and the fold line is connected to the fold line Between the main board and the support plate, the support plate is selectively swingable relative to the main board.

In an embodiment, the foldable cover body may include an angle retainer that limits the support plate and the main board to each other at a support angle, the support angle being an angle between the support plate and the main board, so that the main board is supported Stand with the support of the board.

In one embodiment, the angle holder includes a first magnetic member and a second magnetic member. The first magnetic member is disposed on the support plate and includes a first inclined surface. The second magnetic member is disposed on the main board and includes a second inclined surface. The first inclined surface and the second inclined surface are respectively located on two sides of the fold line and opposite to each other, and the first inclined surface and the second inclined surface are selectively adjacent to each other and adsorbed to each other, so that the support plate and the main board are mutually restricted at a supporting angle.

In one embodiment, the angle retainer is a hinge, the hinge includes a flap and a shaft, and the flap and the shaft are disposed on the main board or the support plate, the flap has a shaft tube, and the shaft tube is rotatably fitted to the outside of the shaft , the support plate and the main board are limited to each other at a support angle.

In an embodiment, the angle between the fold line and the side of the first plate is an acute angle. In an embodiment, wherein the support plate includes a top corner, the top corner is away from the fold line, the angle retainer is a slide member, and the slip member is disposed on the top corner.

In an embodiment, the fold line is parallel to the side of the first plate. In one embodiment, the support plate includes free sides, the free sides are located on opposite sides of the side of the first plate body, the sliders of the angle holder are disposed, and the sliding members are disposed on the free sides.

In an embodiment, the folding keyboard may include a soft protective layer covering the first keyboard portion and the second keyboard portion.

In an embodiment, the folding type expansion keyboard may include a foldable cover plate, and the foldable cover plate is connected to the third flexible piece extending from the connecting side of the second board body, and the connecting side and the first flexible piece are respectively located at the The adjacent sides of the two plates.

In an embodiment, the folding type expansion keyboard may include a stopper, and the stopper is disposed on the second flexible sheet. The stopper is a rubber strip, a stopper or a bump.

In summary, the folding type expansion keyboard of the present embodiment can be folded by the first board body, the second board body and the foldable cover body, thereby reducing the volume of the folding type expansion keyboard, thereby facilitating carrying and effectively reducing the cost. Improve protection and facilitate production. When in use, the folding keyboard and the foldable cover can be unfolded, that is, the first keyboard portion and the second keyboard portion can be smoothly operated, and the support plate of the foldable cover body can be bent and bent relative to the main board, so that the support plate and the support plate The main boards are limited to each other at a supporting angle for the portable electronic device to be placed for user's viewing.

FIG. 1 is an exploded perspective view of a folding type expansion keyboard according to an embodiment of the present invention. Referring to FIG. 1 , in an embodiment, the folding type expansion keyboard 1 includes a folding keyboard 10 and a foldable cover 20 .

The folding keyboard 10 includes a first board body 11, a second board body 12 and a first flexible piece 13. The first board body 11 is provided with a first keyboard part 111, and the second board body 12 is provided with a second keyboard part. 121, the first flexible sheet 13 is connected between the first plate body 11 and the second plate body 12, so that the first plate body 11 and the second plate body 12 can be selectively covered or unfolded relative to each other. As shown in Fig. 1, in a state in which the first plate body 11 and the second plate body 12 are unfolded relative to each other, the first keyboard portion 111 and the second keyboard portion 121 can be exposed for the user to operate. As shown in FIG. 2, in a state in which the second plate body 12 is closed with respect to the first plate body 11, the volume of the folding keyboard 10 is reduced to facilitate carrying and storage.

In one embodiment, the first keyboard portion 111 and the second keyboard portion 121 can include a plurality of buttons, and the user can input the electronic signal by tapping the buttons of the first keyboard portion 111 and the second keyboard portion 121. . The material of the first flexible sheet 13 may be a flexible material (such as leather or rubber), and the first plate 11 and the second plate may be made by the flexible characteristics of the first flexible sheet 13. 12 can be swiveled to cover or unfold. In other words, the user can swing the cover or the second plate body 12 relative to the first plate body 11 only by inverting the second plate body 12; and the user can simply flip the first plate body 11, that is, The first plate body 11 can be swiveled or unfolded relative to the second plate body 12. In addition, when the first plate body 11 and the second plate body 12 are in a closed state (this is shown, for example, in FIG. 2), the first plate body 11 and the second plate body 12 are overlapped with each other, and the first keyboard portion is overlapped. The 111 and the second keyboard portion 121 can be wrapped between the first plate body 11 and the second plate body 12, thereby achieving protection against dust, water, and collision, thereby increasing the service life.

In one embodiment, the first board body 11, the second board body 12, and the first flexible sheet 13 may be made of the same flexible material (for example, leather), and the first board 11 and the second board are formed. The body 12 has a function of being relatively foldable and expandable by the flexibility of the first flexible sheet 13 itself. Compared with the way in which the folding is achieved by mechanical structures such as pivots or connecting rods in the past, the cost can be greatly reduced and production is facilitated, and the volume of the folding keyboard 10 is greatly reduced. In some embodiments, the first plate body 11 and the second plate body 12 can respectively cover the bottom and the periphery of the first keyboard portion 111 and the second keyboard portion 121 to enhance the protection effect. However, in some embodiments, the first plate body 11 and the second plate body 12 may also be plastic or acrylic plates, which is not limited.

In addition, in some embodiments, the folding keyboard 10 may further include a soft protective layer 15 (for example, a waterproof film) for covering the first keyboard portion 111 and the second keyboard portion 121, and further capable of being in the first keyboard portion 111. When the second keyboard unit 121 is in an operable state (as shown in Fig. 1), the waterproof and dustproof protection effect can be achieved. For example, the soft protective layer 15 is, for example, a waterproof PU (poly urethane) leather, and the soft protective layer 15 is provided with a pattern corresponding to the position, size, and shape of the buttons of the first keyboard portion 111 and the second keyboard portion 121 ( For example, a plurality of quadrilateral patterns with chamfers). The pattern of the soft protective layer 15 can be formed by performing an imprint process on a flat PU leather, and the soft protective layer 15 is integrally formed to cover the first keyboard portion 111 and the second keyboard portion 121. In one embodiment, the first plate body 11, the second plate body 12, the first flexible sheet 13, and the soft protective layer 15 may be integrally formed and made of the same flexible material (for example, leather). to make.

As shown in the first and second embodiments, in an embodiment, the first board body 11 further includes a side edge 112 and a second flexible piece 113. The side edge 112 is located on the first board with the first flexible piece 13 respectively. Adjacent to both sides of the body 11, the second flexible sheet 113 is extended by the side edges 112. In some embodiments, the material of the second flexible sheet 113 may be a flexible material (such as leather or rubber), and the second flexible sheet 113 is integrally connected to the side 112 of the first board 11 . The length of the second flexible sheet 113 may be the same as the length of the edge of the side edge 112. Alternatively, the length of the second flexible sheet 113 may be shorter than the edge of the side edge 112, which is not limited.

The foldable cover 20 is connected to the second flexible sheet 113, so that the foldable cover 20 can be covered or unfolded with respect to the first plate 11, as shown in Figs. 2 and 3. In one embodiment, the foldable cover 20, the first plate 11 and the second plate 12 are substantially the same size, and by the flexible characteristics of the second flexible piece 113, the foldable cover 20 can The sway is unfolded relative to the first plate body 11 (as disclosed in FIG. 2). Alternatively, as shown in FIG. 3, after the first plate body 11 and the second plate body 12 are covered with each other, the foldable cover body 20 can be swung over the first plate body 11 and stacked on the second plate. The body 12 is provided for reducing the overall volume of the folding type expansion keyboard 1 for carrying and storing, and the foldable cover 20 can further strengthen the protection of the folding keyboard 10.

As shown in FIG. 1 , in an embodiment, the foldable cover 20 can be deployed to carry the portable electronic device 2 (such as a smart phone, a tablet or a PDA, etc.) and enable the portable electronic device. The device 2 is fixed at an oblique angle so that the user can view the portable electronic device 2 at a more comfortable angle when operating the keyboard. In some embodiments, the foldable cover 20, the first plate 11, the second plate 12, the first flexible piece 13, and the second flexible piece 113 are integrally formed integrally and have the same flexibility. The material (such as leather) can be manufactured more quickly and effectively, and the volume of the folding keyboard 10 is greatly reduced.

In one embodiment, the foldable cover 20 includes a fold line 21, a main board 22 and a support plate 23, wherein the fold line 21 is connected between the main board 22 and the support board 23. The fold line 21 allows the support plate 23 to be selectively pivoted relative to the main plate 22, in other words, the foldable cover 20 is selectively bendable in accordance with the fold line 21. Referring to FIGS. 1 and 2, in an embodiment, when the foldable cover 20 is unfolded relative to the first plate 11, and the foldable cover 20 and the first plate 11 are placed in the same operation. When on a plane (e.g., a table top), the angle between the fold line 21 and the side 112 of the first panel 11 is an acute angle (e.g., 30 degrees or 60 degrees). In this embodiment, the two ends of the fold line 21 are respectively connected to one side of the foldable cover 20 and one of the corners thereof. In addition, in some embodiments, the two ends of the fold line 21 can also be connected to the two sides or two corners of the foldable cover 20, and form a different angle with the side 112 of the first plate 11. This is not limited. That is to say, the position of the fold line 21 in the foldable cover 20 can be designed according to actual needs.

Thereby, in an embodiment, when the user wants to use the folding expansion keyboard 1, the folding expansion keyboard 1 can be placed on an operation plane (for example, a desktop), and the foldable cover 20 is opposite to the first The plate body 11 is unfolded, and the operation support plate 23 is swung outwardly relative to the main plate 22 to abut against the operation plane (the main plate 22 can be simultaneously rotated relative to the first plate body 11 to adjust the inclination angle of the main plate 22), that is, The support plate 23 and the main board 22 can be placed at a supporting angle (for example, 30 degrees, 45 degrees, 60 degrees) with each other, so that the main board 22 can be supported by the supporting board 23 and can stand at an inclined angle (as shown in FIG. 1). For the portable electronic device 2 to be placed. In an embodiment, as shown in FIGS. 4 and 6, the support angle refers to the support plate 23 swinging outward relative to the main board 22, so that the main board 22 is supported by the support board 23 and can stand at an oblique angle ( When the angle θ2 in Fig. 6, that is, the angle between the main board 22 and the operation plane, the angle between the support plate 23 and the main plate 22 (the support angle may be the angle θ1 in Fig. 5).

In some embodiments, the main board 22 and the support plate 23 are formed of a flexible material (for example, leather) sandwiched hard board, and the fold line 21 can be made of the same flexible material without the interlayer hard board. Further, the foldable cover 20 as a whole can be integrally formed.

In one embodiment, the foldable cover 20 further includes an angle retainer 30 that limits the support plate 23 and the main plate 22 to each other at the support angle, thereby preventing the support plate 23 from easily swinging relative to the main plate 22 Loss of support.

As shown in FIG. 4, in an embodiment, the angle holder 30 includes a first magnetic member 31 and a second magnetic member 32. The first magnetic member 31 is disposed on the support plate 23 and includes a first inclined surface 311. The second magnetic member 32 is disposed on the main board 22 and includes a second inclined surface 321 . The first inclined surface 311 and the second inclined surface 321 are respectively located on opposite sides of the folding line 21 and opposite to each other. The first inclined surface 311 and the second inclined surface 321 are selectively Adjacent to each other and adsorbed to each other, the support plate 23 and the main plate 22 are limited to each other at a supporting angle.

Referring to Figures 4 and 5, in this embodiment, the support plate 23 and the main plate 22 respectively include an inclined side edge 211 adjacent to the fold line 21, and the two inclined side edges 211 are opposed to each other. The first magnetic member 31 is fixed inside the support plate 23 (for example, embedded in the interlayer of the support plate 23) and the inclination angle of the first slope 311 is adapted to the inclined side edge 211 of the support plate 23, and The two magnetic members 32 are fixed inside the main board 22 and the inclination angle of the second inclined surface 321 is adapted to the inclined side edge 211 of the main board 22. In detail, as shown in FIG. 4, in the present embodiment, when the foldable cover 20 has not been bent (or the support plate 23 and the main plate 22 are not yet pivoted close to each other), the support plate 23 The cross section of the two inclined side edges 211 of the main board 22 is a substantially V-shaped configuration. The first slope 311 and the second slope 321 are opposite to each other and are respectively disposed at an angle corresponding to the two inclined side edges 211. Thereby, as shown in FIG. 5, when the support plate 23 is swivel relative to the main plate 22 and the main plate 22 is at a supporting angle (such as the included angle θ1), the support plate 23 and the two inclined side edges 211 of the main plate 22 are 211 The first slope 311 and the second slope 321 are attracted to each other to reach the limit. In some embodiments, the first magnetic member 31 and the second magnetic member 32 can also be disposed on the outside of the support plate 23 and the main board 22 respectively (for example, the first magnetic member 31 and the second magnetic member 32 can be bonded. Or the hot melt method is fixed on the support plate 23 and the outside of the main board 22 respectively, which is not limited. In addition, in some embodiments, the first magnetic member 31 and the second magnetic member 32 may be a magnet and a magnetic conductive member (such as an iron block), or the first magnetic member 31 and the second magnetic member 32, respectively. Can be all magnets.

In one embodiment, the angle holder 30 can be a hinge, including a flap 33 and a shaft 34. The flap 33 and the shaft 34 are disposed on the support plate 23. The flap 33 has a shaft tube 331, and a shaft tube 331 It is rotatably fitted to the outside of the shaft 34. As shown in FIG. 5, in this embodiment, the flap 33 is fixed inside the support plate 23 (e.g., embedded in the interlayer of the support plate 23), and the shaft 34 is fixed inside the support plate 23 and The position of the shaft 21 is close to the diameter of the shaft 331 of the flap 33 (for example, the rod diameter of the shaft 34 is 1 cm, and the diameter of the shaft 331 is 0.95 cm), so that the shaft The tube 331 can be tightly fitted to the outside of the shaft 34. When the support plate 23 is swiveled relative to the main plate 22 and the main plate 22 is at a supporting angle (such as the angle θ1), the tension between the shaft tube 331 and the shaft 34 can be matched. The friction is used to obtain a limit, so that the support plate 23 is less likely to be displaced at the support angle and has the effect of supporting the main board 22.

As shown in FIG. 6, in some embodiments, the angle holder 30 can also be a two-axis hinge, including two of the above-mentioned flaps 33, 33A and two shafts 34, 34A, one of which 33 and The shaft 34 is disposed on the support plate 23 (here, embedded in the interlayer of the support plate 23), and the other flap 33A and the shaft 34A are disposed on the main board 22 (here, embedded in the interlayer of the main board 22). And the two flaps 33, 33A can be connected to each other. Thereby, when the support plate 23 is swung relative to the main plate 22 and the main plate 22 is at a supporting angle with each other, a stronger tightening friction force can be generated and a better limit effect can be obtained. In some embodiments, the flaps 33, 33A and the shafts 34, 34A may also be disposed outside of the support plate 23 and the main plate 22, which is not limited.

As shown in FIG. 7, in an embodiment, the support plate 23 includes a top corner 231, the top corner 231 is away from the fold line 21, and the angle retainer 30 can be a sliding member (such as a rubber block, a rubber block or a rubber layer). The sliding member is disposed (eg, adhered or thermally melted) on the top corner 231. When the supporting plate 23 and the main plate 22 are at a supporting angle with each other, the top corner 231 of the supporting plate 23 abuts on the operation plane, and The frictional force between the sliding member and the operation plane is increased, so that the support plate 23 has an effect of supporting the main plate 22 at a supporting angle and is less prone to displacement. In some embodiments, the angle holder 30 can be a plurality of anti-slip members distributed on the side of the support plate 23 against the operation plane, or the angle holder 30 can also be an elongated anti-slip member, disposed in the The support plate 23 abuts against the side of the operation plane, and this portion is not limited.

As shown in FIG. 8 , in an embodiment, the fold line 21 may also be parallel to the side edge 112 of the first board body 11 , and the support board 23 may be pivoted relative to the main board 22 to form the foldable cover body 20 into a triangular solid shape. The support plate 23 can be abutted against the operation plane to provide a supporting effect on the main board 22. At this time, the support board 23 and the main board 22 are at a supporting angle (such as an angle θ1), so that the main board 22 stands at an oblique angle (such as an angle). Θ2). In addition, in an embodiment, the support plate 23 includes a free side 232. Here, the free side 232 and the side 112 of the first plate 11 are respectively located on opposite sides of the foldable cover 20, and The support plate 23 abuts against the operating plane with free sides 232. The slider of the angle holder 30 is disposed on the free side 232. In the embodiment, the slider is fixed (eg, adhered or heat-fused) to the free side 232 by a plurality of rubber blocks or rubber blocks. However, the anti-slip member may also be a rubber layer or a silicone layer coated on the free side 232 to increase the friction between the free side 232 and the operation plane, so that the support plate 23 is less likely to be displaced to reach the limit. Of course, in this embodiment, the angle holder 30 (ie, the magnetic member or the hinge) disclosed in the other embodiments may be used to achieve the limit function, which is not limited.

As shown in FIG. 9, in an embodiment, the folding type expansion keyboard 1 can include a foldable cover 40, and the foldable cover 40 is connected to the third flexible portion extending from the connecting side 122 of the second board 12. The sheet 123, the connecting side 122 and the first flexible sheet 13 are respectively located on adjacent sides of the second board 12. In some embodiments, the structure of the foldable cover 40 can be the same as that of the foldable cover 20 for placement by another portable electronic device. In addition, the portable electronic device 2 can be placed on the foldable cover 20 or the foldable cover 40 according to the actual needs of the user (for example, usage habits). In some embodiments, the foldable cover 40 and the third flexible sheet 123 can be made of a flexible material such as leather.

As shown in FIG. 10, in an embodiment, the folding type expansion keyboard 1 may include a stopper 16 which is disposed on the second flexible sheet 113. For example, the stop member 16 can be a rubber strip, a stop or a bump. Therefore, when the portable electronic device 2 is placed on the main board 22, the bottom of the portable electronic device 2 can be stopped by the stopper 16 without being easily displaced.

In summary, the folding type expansion keyboard can be folded by the first board body, the second board body and the foldable cover body, thereby reducing the volume of the folding type expansion keyboard, thereby facilitating carrying, effectively reducing cost, enhancing protection effect and being convenient. produce. When in use, the folding keyboard and the foldable cover can be unfolded, that is, the first keyboard portion and the second keyboard portion can be smoothly operated, and the support plate of the foldable cover body can be bent and bent relative to the main board, so that the support plate and the support plate The main boards are limited to each other at a supporting angle for the portable electronic device to be placed for user's viewing.

Although the technical content of the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with the art, and some modifications and refinements that do not depart from the spirit of the present invention should be included in the creation. Therefore, the scope of protection of this creation is subject to the definition of the scope of the patent application.

1‧‧‧Folding expansion keyboard
2‧‧‧Portable electronic devices
10‧‧‧Folding keyboard
11‧‧‧ first board
111‧‧‧First keyboard department
112‧‧‧ side
113‧‧‧Second flexible film
12‧‧‧Second plate
121‧‧‧Second keyboard department
122‧‧‧Connecting side
123‧‧‧ Third flexible film
13‧‧‧First flexible film
15‧‧‧Soft protective layer
16‧‧‧stops
20‧‧‧Foldable cover
21‧‧‧ fold line
211‧‧‧ sloping side edges
22‧‧‧ motherboard
23‧‧‧Support board
231‧‧‧Top corner
232‧‧‧Free side
30‧‧‧ Angle Holder
31‧‧‧First magnetic parts
311‧‧‧ first slope
32‧‧‧Second magnetic parts
321‧‧‧second slope
33, 33A‧‧‧Folds
331‧‧‧ shaft tube
34, 34A‧‧‧ shaft
40‧‧‧Foldable cover θ1, θ2‧‧‧ angle

[Fig. 1] is a perspective view showing an embodiment of the present folding type expansion keyboard. [Fig. 2] is a schematic view showing the folding of an embodiment of the present folding keyboard. [Fig. 3] is a folding schematic view of an embodiment of the present foldable cover. [Fig. 4] is a cross-sectional view showing the first embodiment of the present angle retainer. [Fig. 5] is a cross-sectional view of the support plate of Fig. 4 opposite to the main plate. [Fig. 6] is a cross-sectional view showing a second embodiment of the present angle retainer. [Fig. 7] is a cross-sectional view showing a third embodiment of the present angle retainer. [Fig. 8] is a perspective view of another embodiment of the present foldable cover. [Fig. 9] is a perspective view showing another embodiment of the present folding type expansion keyboard. [Fig. 10] is a perspective view showing still another embodiment of the present folding type expansion keyboard.

1‧‧‧Folding expansion keyboard

2‧‧‧Portable electronic devices

10‧‧‧Folding keyboard

11‧‧‧ first board

111‧‧‧First keyboard department

112‧‧‧ side

113‧‧‧Second flexible film

12‧‧‧Second plate

121‧‧‧Second keyboard department

13‧‧‧First flexible film

15‧‧‧Soft protective layer

20‧‧‧Foldable cover

21‧‧‧ fold line

22‧‧‧ motherboard

23‧‧‧Support board

Claims (12)

A folding type expansion keyboard includes: a folding keyboard, comprising a first board body, a second board body and a first flexible piece, wherein the first board body is provided with a first keyboard part, the second board body a second keyboard portion is disposed, the first flexible plate is coupled between the first plate body and the second plate body, so that the first plate body and the second plate body are selectively closed relative to each other Or expanding, wherein the first board further comprises a side edge and a second flexible piece, the side edge and the first flexible piece are respectively located on adjacent sides of the first board, the second a flexible sheet extending from the side; and a foldable cover coupled to the second flexible sheet to selectively fold the foldable cover relative to the first panel or The foldable cover body comprises a main board, a support board and a fold line connected between the main board and the support board, so that the support board can be selectively swivel relative to the main board. The foldable expansion keyboard of claim 1, wherein the foldable cover further comprises an angle retainer, the angle bracket is configured to limit the support plate and the main plate to each other at a support angle, the support angle being the support The angle between the board and the board. The folding type expansion keyboard of claim 2, wherein the angle holder comprises a first magnetic member and a second magnetic member, the first magnetic member is disposed on the support plate and includes a first inclined surface. The second magnetic member is disposed on the main board and includes a second inclined surface, the first inclined surface and the second inclined surface are respectively located on two sides of the fold line and opposite to each other, and the first inclined surface and the second inclined surface are selectively Adjacent to each other and adsorbed to each other, the support plate and the main board are limited to each other at the support angle. The folding type expansion keyboard of claim 2, wherein the angle holder is a hinge, the hinge comprises a flap and a shaft, and the flap and the shaft are disposed on the main board or the support board, the fold The sheet has a shaft tube rotatably fitted to the outside of the shaft to limit the support plate and the main plate to each other at the supporting angle. The folding expansion keyboard of claim 2, wherein the angle between the fold line and the side of the first board is an acute angle. The folding type expansion keyboard of claim 5, wherein the support plate comprises a top corner, the top corner is away from the fold line, and the angle retainer is a stop member, and the stop member is disposed on the top corner. The foldable expansion keyboard of claim 2, wherein the fold line is parallel to the side of the first board. The folding expansion keyboard of claim 7, wherein the support plate comprises a free side, the free side is located on an opposite side of the side of the first plate, and the angle retainer is a slide. The anti-slip member is disposed on the free side. The folding expansion keyboard of claim 1, wherein the folding keyboard further comprises a soft protective layer covering the first keyboard portion and the second keyboard portion. The foldable expansion keyboard of claim 1, further comprising a foldable cover, the foldable cover being connected to a third flexible piece extending from a connecting side of the second plate, the connecting side And the first flexible piece are respectively located on adjacent sides of the second plate body. The folding expansion keyboard of claim 1 further includes a stopper, the stopper being disposed on the second flexible sheet. The folding type expansion keyboard of claim 11, wherein the stopper is a rubber strip, a stopper or a bump.