TW202119173A - External keyboard and portable electronic device - Google Patents

Abstract

An external keyboard including a casing, a plurality of transparent buttons and a plurality of elastic arms is provided. The casing has a plurality of through holes where the plurality of transparent buttons are respectively disposed in. Each of the plurality of transparent buttons is connected to the casing through two of the plurality of elastic arms that are symmetrically disposed and the two elastic arms are disposed at two sides of the corresponding transparent button. Each of the plurality of elastic arms includes a first connecting part connected to the corresponding transparent button, a second connecting part connected to the casing and an oblique arm part located between the first connecting part and the second connecting part, and each of the oblique arm parts has a recess. A portable electronic device is also provided.

Description

External keyboard and portable electronic device

The invention relates to a keyboard and an electronic device, and more particularly to an external keyboard and a portable electronic device.

Take an external keyboard applied to a smart phone, tablet or dual-screen notebook computer as an example. The external keyboard is suitable for covering the touch screen to cooperate with the virtual keyboard displayed on the touch screen for users to use External keyboard operation or input message to smart phone, tablet or dual-screen laptop.

A common external keyboard is to print characters or patterns corresponding to a specific country or a specific input method on the keys, so it cannot be universally used in all countries or all input methods. On the other hand, most of the common external keyboards are flexible membrane keyboards, so they cannot give the user a solid and clear operating feel.

The present invention provides an external keyboard, which has excellent versatility and can feedback a solid and clear operating feel to the user.

The present invention provides a portable electronic device integrated with the above-mentioned external keyboard.

The present invention provides an external keyboard, which includes a casing, a plurality of transparent keys, and a plurality of elastic arms. The housing has a plurality of through holes, and the plurality of transparent keys are respectively arranged in the plurality of through holes. Each transparent key is connected to the shell through two symmetrically arranged elastic arms, and the two elastic arms are respectively located on both sides of the corresponding transparent key, wherein each elastic arm includes a first connecting portion connected to the corresponding transparent key, The second connecting part connected to the shell and opposite to the first connecting part and the inclined arm part located between the first connecting part and the second connecting part, and each inclined arm part has a recess.

In an embodiment of the present invention, the inclined arm portion of each of the above-mentioned elastic arms further has an upper inclined surface and a lower inclined surface opposite to the upper inclined surface, and the recess is located on the upper inclined surface or the lower inclined surface.

In an embodiment of the present invention, each of the above-mentioned transparent keys includes a transparent key body, a transparent conductive layer covering the transparent key body, and a frame, and the transparent key body and the transparent conductive layer are disposed in the frame. The transparent conductive layer has a top surface and a bottom surface opposite to the top surface, and the top surface and the bottom surface are exposed outside the frame.

In an embodiment of the present invention, the first connecting portion of each elastic arm described above is connected to the corresponding frame.

In an embodiment of the present invention, each of the above-mentioned transparent keys has a pressing surface, and the extension direction of the oblique arm portion of each elastic arm is not perpendicular to the normal direction of the pressing surface of the corresponding transparent key.

In an embodiment of the present invention, the angle between the extension direction of the oblique arm portion of each elastic arm and the reference line perpendicular to the normal direction of the pressing surface of the corresponding transparent key is between 45 degrees and 60 degrees. .

The present invention provides a portable electronic device including a first display, a second display and the above-mentioned external keyboard. The second display is pivotally connected to the first display, and the second display has a display area and a non-display area surrounding the display area, and the second display is provided with a plurality of sensors in the non-display area. The external keyboard is detachably and slidably arranged on the second display. The plurality of transparent key pairs are located in the display area. The casing also has a sensing part located in the non-display area. When the sensing part overlaps any sensor, the area of the display area of the second display that overlaps with the external keyboard is displayed corresponding to the multiple A virtual keyboard with transparent keys.

In an embodiment of the present invention, other areas of the display area of the second display that do not overlap with the external keyboard display the user interface.

In an embodiment of the present invention, the plurality of sensors described above include a plurality of Hall sensors, and the sensed part includes a magnet.

In an embodiment of the present invention, the plurality of sensors described above include a plurality of light sensors, and the sensed part includes a reflector.

Based on the above, the external keyboard of the present invention can be applied to a touch display, and the portable electronic device of the present invention adopts the above external keyboard, so the user can operate the virtual keyboard displayed in the touch display through the external keyboard. Because the transparent keys in the external keyboard are supported by the elastic arms and hung on the touch display, the elastic arms are provided with recesses. When the transparent button is pressed down by force, the elastic arm under the force will collapse and deform from the depression, so that the transparent button will fall down instantly to feedback the user a solid and clear operating feel.

In addition, the transparent keys allow light to pass through, so the user can view the characters or patterns of the virtual keys in the virtual keyboard through the transparent keys, so as to facilitate operation or input information to the touch display. Furthermore, according to different countries, different input methods or different operation requirements, users can switch the characters or patterns displayed on the virtual keyboard according to their personal needs. Therefore, the external keyboard and portable electronic device of the present invention have excellent universality. Sex.

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

1A to 1C are schematic top views of a portable electronic device in different modes according to an embodiment of the invention. Please refer to FIGS. 1A and 1B. In this embodiment, the portable electronic device 10 may be a combination of a dual-screen notebook computer and an external keyboard 100. The dual-screen notebook computer includes a first display 20 and a pivot The second display 30 of the first display 20. The second display 30 may be a touch display, and the first display 20 may be a touch display or a non-touch display.

Specifically, in other embodiments, the portable electronic device may be a combination of a smart phone and an external keyboard, or a combination of a tablet computer and an external keyboard, or another touch display device and an external keyboard. The combination of the keyboard.

As shown in FIGS. 1A and 1B, the second display 30 has a display area 31 and a non-display area 32 surrounding the display area 31. The display area 31 is a touch display area, and the second display 30 is provided in the non-display area 32. There are multiple sensors 33. For example, the plurality of sensors 33 may be a plurality of Hall sensors.

On the other hand, the external keyboard 100 is detachably and slidably disposed on the second display 30. In the operation mode shown in FIG. 1A, the external keyboard 100 does not cover the second display 30. In some embodiments, the external keyboard 100 may be wirelessly coupled to the first display 20 or the second display 30 for the user to operate or input information to the first display 20 or the second display 30 through the external keyboard 100.

In this embodiment, the external keyboard 100 is provided with a sensing part 101, wherein the sensing part 101 can be a magnet, and the plurality of sensors 33 are arranged on the sliding path 102 of the sensing part 101. In the operation mode shown in FIG. 1B, the external keyboard 100 covers a part of the second display 30, and the pair of sensed parts 101 are located in the non-display area 32 and overlap the first sensor 33. When the first sensor 33 detects the magnetic flux change, the second display 30 can determine the overlap area between the external keyboard 100 and the display area 31, and cut the display screen of the display area 31 accordingly. Furthermore, the area of the display area 31 that overlaps the external keyboard 100 displays the virtual keyboard 34, and the other area of the display area 31 of the second display 30 that does not overlap the external keyboard 100 displays the user interface 35.

Therefore, the user can operate or input information to the portable electronic device 10 through the cooperation of the external keyboard 100 and the virtual keyboard 34. In addition, the user can also operate or input information to the portable electronic device 10 through the user interface 35. In other words, the portable electronic device 10 has excellent operation convenience and flexibility.

1B and 1C, when the external keyboard 100 slides relative to the second display 30, and the sensed part 101 moves from the first sensor 33 to the second sensor 33, the sensed part 101 overlaps the second sensor 33, and the second sensor 33 detects the magnetic flux change. At this time, the second display 30 can determine that the overlapping area between the external keyboard 100 and the display area 31 has changed, and adjust the cutting method of the display screen accordingly.

1A to 1C, in this embodiment, the external keyboard 100 includes a plurality of transparent keys 110, when the sensed part 101 overlaps any sensor 33, the plurality of transparent keys 110 are located opposite The display area 31, and an area overlapping the external keyboard 100 in the display area 31 displays a virtual keyboard 34 corresponding to the plurality of transparent keys 110. Furthermore, the virtual keyboard 34 includes a plurality of virtual keys corresponding to the plurality of transparent keys 110, and each transparent key 110 corresponds to a virtual key.

Since the transparent key 110 allows light to pass through, the user can view the characters or patterns of the virtual keys in the virtual keyboard 34 through the transparent key 110 to facilitate operation or input information to the portable electronic device 10. Furthermore, according to different countries, different input methods or different operation requirements, the user can switch the characters or patterns displayed on the virtual keyboard 34 according to personal needs, so the external keyboard 100 has excellent versatility.

2A is an enlarged schematic partial cross-sectional view of the portable electronic device of FIG. 1B along the section line I-I. Please refer to FIGS. 1B and 2A. In this embodiment, the external keyboard 100 further includes a housing 120 and a plurality of elastic arms 130, wherein the sensed portion 101 is disposed on the side of the housing 120, and the housing 120 has A plurality of through holes 121 for receiving the plurality of transparent keys 110 and the plurality of elastic arms 130. The housing 120 is placed on the touch display surface 36 of the second display 30, and the plurality of transparent buttons 110 and the plurality of elastic arms 130 are suspended on the touch display surface 36 of the second display 30.

Furthermore, each through hole 121 is provided with a transparent key 110 and two symmetrically arranged elastic arms 130, and the transparent key 110 is connected to the housing 120 through the two elastic arms 130. Furthermore, the two elastic arms 130 are respectively located on both sides of the transparent key 110, and the transparent key 110 is suspended on the touch display surface 36 of the second display 30 by the support of the two elastic arms 130. In another embodiment, the transparent key 110 can be connected to the housing 120 through two opposite elastic arms 130, that is, the four elastic arms 130 are respectively located on the front, rear, left, and right sides of the transparent key 110, and surround the transparent key 110 to make the transparent key 110 transparent. The button 110 is suspended on the touch display surface 36 of the second display 30 by the support of the four elastic arms 130.

In this embodiment, in any through hole 121, when the transparent key 110 is pressed down by force, the transparent key 110 moves closer to or contacts the touch display surface 36 of the second display 30, and the two elastic arms 130 generate Deformed. Once the downward pressure applied to the transparent button 110 is removed, the two elastic arms 130 elastically recover to drive the transparent button 110 to move away from the touch display surface 36 of the second display 30 and return to the initial position shown in FIG. 2A .

In this embodiment, the material of each elastic arm 130 can be silicone, so it has excellent elasticity. Furthermore, each elastic arm 130 includes a first connecting portion 131, a second connecting portion 132, and an oblique arm portion 133 connected to the corresponding transparent button 110, wherein the first connecting portion 131 is connected to the transparent button 110, and the second connecting portion 132 is connected to the housing 120. The second connecting portion 132 is disposed relative to the first connecting portion 131, and the oblique arm portion 133 is located between the first connecting portion 131 and the second connecting portion 132.

The oblique arm portion 133 serves as the main deformation section of the elastic arm 130, wherein the oblique arm portion 133 has a recess 133a, and the recess 133a is located on the upper surface 133b of the oblique arm portion 133. Furthermore, the upper surface 133 b of the inclined arm portion 133 faces away from the touch display surface 36 of the second display 30, and the lower surface 133 c of the inclined arm portion 133 faces the touch display surface 36 of the second display 30. Because the recess 133a is a structural weakness of the elastic arm 130, when the transparent button 110 is pressed down by force, the elastic arm 130 under force will collapse and deform from the recess 133a, causing the transparent button 110 to fall instantaneously to provide feedback to the user. Clear operating feel, and similar to the combination of scissors feet and rubber dome feedback to the user's operating feel.

For example, in each elastic arm 130, the position of the recess 133a may be close to the first connecting portion 131, close to the second connecting portion 132, or at the midpoint of the inclined arm portion 133, wherein the inner diameter of the recess 133a , Width or depth can be 1 mm. In addition, in each inclined arm portion 133, the number of recesses 133a may be one or more.

2A, in this embodiment, each transparent key 110 includes a transparent key body 111, a transparent conductive layer 112 covering the transparent key body 111, and a frame 113, wherein the transparent key body 111 and the transparent conductive layer 112 are disposed on Inside the frame 113, and the top surface 112 a and the bottom surface 112 b of the transparent conductive layer 112 are exposed outside the frame 113. The top surface 112 a of the transparent conductive layer 112 serves as a pressing surface of the transparent key 110, wherein the bottom surface 112 b is opposite to the top surface 112 a and faces the touch display surface 36 of the second display 30.

The material of the transparent key body 111 can be acrylic or glass, or other materials with a similar light-transmitting effect, and the material of the transparent conductive layer 112 can be a transparent conductive material, such as indium tin oxide (Indium Tin Oxide) or Silver Nanowire. When the transparent button 110 is pressed down by force, the bottom surface 112b of the transparent conductive layer 112 moves closer to or contacts the touch display surface 36 of the second display 30, and the second display 30 determines the touch display surface 36 according to the change in capacitance value. Trigger position.

Please refer to FIG. 1B and FIG. 2A, in the orthographic projection direction, each transparent key 110 overlaps a virtual key in the virtual keyboard 34. When the user presses any transparent key 110, the virtual key corresponding to the transparent key 110 in the virtual keyboard 34 is triggered. In other words, the user can operate the virtual keyboard 34 through the external keyboard 100.

2A, the first connecting portion 131 of each elastic arm 130 is connected to the corresponding frame 113, in a direction parallel to the normal direction 114 of the pressing surface of the transparent key 110 (that is, the top surface 112a of the transparent conductive layer 112) Above, there is a height difference between the first connecting portion 131 and the second connecting portion 132. In detail, the extension direction 134 of the inclined arm portion 133 of each elastic arm 130 is not perpendicular to the normal direction 114 of the pressing surface of the corresponding transparent key 110 (ie, the top surface 112a of the transparent conductive layer 112). On the other hand, the angle 136 between the extending direction 134 of the inclined arm portion 133 of each elastic arm 130 and the reference line 135 perpendicular to the normal direction 114 is between 45 degrees and 60 degrees, so that the inclined arm portion 133 has sufficient The supporting force is used to support the transparent key 110 and ensure that the transparent key 110 has a sufficient pressing stroke.

2B is an enlarged schematic diagram of a partial cross-section of a portable electronic device according to another embodiment of the present invention. 2B, compared with the external keyboard 100 of FIG. 2A, in the external keyboard 100A of this embodiment, the recess 133a is located on the lower surface 133c of the inclined arm portion 133 and faces the touch of the second display 30 Display surface 36. Because the recess 133a is a structural weakness of the elastic arm 130, when the transparent button 110 is pressed down by force, the elastic arm 130 under force will collapse and deform from the recess 133a, causing the transparent button 110 to fall instantaneously to provide feedback to the user. Clear operating feel, and similar to the combination of scissors feet and rubber dome feedback to the user's operating feel.

For example, in each elastic arm 130, the position of the recess 133a may be close to the first connecting portion 131, close to the second connecting portion 132, or at the midpoint of the inclined arm portion 133, wherein the inner diameter of the recess 133a , Width or depth can be 1 mm. In addition, in each inclined arm portion 133, the number of recesses 133a may be one or more.

3A to 3F are schematic top views of a portable electronic device in different operation modes according to another embodiment of the present invention. Please refer to FIGS. 3A and 3B. The design principle of the portable electronic device 10A of this embodiment is roughly the same as the design principle of the portable electronic device 10 of the previous embodiment. The main difference is that the portable electronic device 10A adopts The principle of light sensing is used to determine the area overlapped with the external keyboard 100 in the display area 31.

In this embodiment, the second display 30 is provided with a plurality of sensors 33a in the non-display area 32, and may be a plurality of light sensors. Each light sensor includes a light emitting part and a light receiving part, wherein the light emitting part is used for emitting light, and the light receiving part is used for receiving the reflected light. Correspondingly, the sensed portion 101a may be a reflector, and the plurality of sensors 33a are arranged on the sliding path 102 of the sensed portion 101a.

In the operation mode shown in FIG. 3A, the external keyboard 100 does not cover the second display 30. In the operation mode shown in FIG. 3B, the external keyboard 100 covers a part of the second display 30, in which the sensing portion 101a is located in the non-display area 32 and overlaps the first sensor 33a. When the light emitted by the first sensor 33 is projected onto the sensing part 101a, the light is reflected from the sensing part 101a back to the first sensor 33, and is received by the first sensor 33. At this time, the second display 30 can determine the overlap area between the external keyboard 100 and the display area 31, and cut the display screen of the display area 31 accordingly. Furthermore, the area of the display area 31 that overlaps the external keyboard 100 displays the virtual keyboard 34, and the other area of the display area 31 of the second display 30 that does not overlap the external keyboard 100 displays the user interface 35.

3B to 3E, as the external keyboard 100 slides relative to the second display 30, the sensed part 101 can move from the first sensor 33 to the second, third, fourth or The fifth sensor 33. Based on the change of the light transmitting and receiving position, the second display 30 can determine that the overlap area between the external keyboard 100 and the display area 31 has changed, and adjust the cutting method of the display screen accordingly.

In other embodiments, the portable electronic device can use the telecommunication sensing principle to determine the area in the display area that overlaps the external keyboard. In detail, the plurality of sensors may be a plurality of first conductive pads, and the sensed part may be a second conductive pad. When the external keyboard covers a part of the second display and the second conductive pad overlaps any one of the first conductive pads, the second display can determine the overlap area between the external keyboard and the display area according to the electrical conduction position, and accordingly The display screen of the cutting display area.

Fig. 4 is a schematic diagram of switching a virtual keyboard according to an embodiment of the present invention. Please refer to FIG. 4, the virtual keyboard 34 includes a plurality of virtual keys 34a. Taking the cooperation of any virtual key 34a and the corresponding transparent key 110 as an example, the character or pattern of the virtual key 34a is located at the center of the transparent key 110, and only Present a single character or pattern to improve the clarity of presentation. On the other hand, the virtual keyboard 34 includes an input method switching key, a symbol switching key or a pattern switching, so that the user can quickly switch input methods, symbols or patterns through the input method switching key, symbol switching key or pattern switching key.

In summary, the external keyboard of the present invention can be applied to a touch display, and the portable electronic device of the present invention adopts the above-mentioned external keyboard, so the user can operate the virtual keyboard displayed in the touch display through the external keyboard. keyboard. Because the transparent keys in the external keyboard are supported by the elastic arms and hung on the touch display, the elastic arms are provided with recesses. When the transparent button is pressed down by force, the elastic arm under the force will collapse and deform from the depression, so that the transparent button will fall down instantly to feedback the user a solid and clear operating feel.

In addition, the transparent keys allow light to pass through, so the user can view the characters or patterns of the virtual keys in the virtual keyboard through the transparent keys, so as to facilitate operation or input information to the touch display. Furthermore, according to different countries, different input methods or different operation requirements, users can switch the characters or patterns displayed on the virtual keyboard according to their personal needs. Therefore, the external keyboard and portable electronic device of the present invention have excellent universality. Sex.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be subject to those defined by the attached patent application scope.

10.10A: Portable electronic device 20: The first display 30: second display 31: Display area 32: Non-display area 33, 33a: sensor 34: virtual keyboard 34a: Virtual button 35: User Interface 36: Touch display surface 100, 100A: external keyboard 101, 101a: Sensing part 102: Sliding Path 110: Transparent button 111: Transparent key body 112: Transparent conductive layer 112a: Top surface 112b: bottom surface 113: Frame 114: Normal direction 120: shell 121: Through hole 130: Flexible arm 131: The first connection part 132: The second connecting part 133: oblique arm 133a: Depressed 133b: upper surface 133c: lower surface 134: Extension direction 135: Baseline 136: included angle I-I: Sectional line

1A to 1C are schematic top views of a portable electronic device in different operation modes according to an embodiment of the invention. 2A is an enlarged schematic partial cross-sectional view of the portable electronic device of FIG. 1B along the section line I-I. 2B is an enlarged schematic diagram of a partial cross-section of a portable electronic device according to another embodiment of the present invention. 3A to 3F are schematic top views of a portable electronic device in different operation modes according to another embodiment of the present invention. Fig. 4 is a schematic diagram of switching a virtual keyboard according to an embodiment of the present invention.

10: Portable electronic devices

20: The first display

30: second display

31: Display area

32: Non-display area

33: Sensor

34: virtual keyboard

35: User Interface

100: External keyboard

101: Sensed part

102: Sliding Path

110: Transparent button

120: shell

I-I: Sectional line

Claims (17)

An external keyboard, including: A housing with multiple through holes; A plurality of transparent keys are respectively arranged in the through holes; and A plurality of elastic arms, wherein each of the transparent keys is connected to the housing through two symmetrically arranged elastic arms, and the two elastic arms are respectively located on both sides of the corresponding transparent key, and each of the elastic arms includes a connection corresponding A first connecting portion of the transparent key, a second connecting portion connected to the housing and opposite to the first connecting portion, and an oblique arm portion located between the first connecting portion and the second connecting portion, and Each of the inclined arm portions has a depression. The external keyboard according to claim 1, wherein the inclined arm portion of each elastic arm further has an upper inclined surface and a lower inclined surface opposite to the upper inclined surface, and the recess is located on the upper inclined surface. The external keyboard according to claim 1, wherein the inclined arm portion of each elastic arm further has an upper inclined surface and a lower inclined surface opposite to the upper inclined surface, and the recess is located on the lower inclined surface. The external keyboard according to claim 1, wherein each of the transparent keys includes a transparent key body, a transparent conductive layer covering the transparent key body, and a frame, and the transparent key body and the transparent conductive layer are arranged In the frame, the transparent conductive layer has a top surface and a bottom surface opposite to the top surface, and the top surface and the bottom surface are exposed outside the frame. The external keyboard according to claim 4, wherein the first connecting portion of each elastic arm is connected to the corresponding frame. The external keyboard according to claim 1, wherein each transparent key has a pressing surface, and an extension direction of the oblique arm portion of each elastic arm is not perpendicular to the pressing surface of the corresponding transparent key A normal direction. The external keyboard according to claim 6, wherein between the extending direction of the inclined arm portion of each elastic arm and a reference line perpendicular to the normal direction of the pressing surface of the corresponding transparent key An included angle is between 45 degrees and 60 degrees. A portable electronic device, including: A first display; A second display is pivotally connected to the first display, and the second display has a display area and a non-display area surrounding the display area, and the second display is provided with a plurality of sensors in the non-display area ； An external keyboard is detachably and slidably disposed on the second display, wherein the external keyboard includes: A housing with multiple through holes; A plurality of transparent keys are respectively arranged in the through holes, and the transparent key pairs are located in the display area; A plurality of elastic arms, wherein each of the transparent keys is connected to the housing through two symmetrically arranged elastic arms, and the two elastic arms are respectively located on both sides of the corresponding transparent key, and each of the elastic arms includes a connection corresponding A first connecting portion of the transparent key, a second connecting portion connected to the housing and opposite to the first connecting portion, and an oblique arm portion located between the first connecting portion and the second connecting portion, and Each of the inclined arms has a depression, Wherein the housing further has a sensed portion located in the non-display area, when the sensed portion overlaps any one of the sensors, the display area of the second display overlaps the external keyboard The area of shows the virtual keyboard corresponding to the transparent keys. The portable electronic device according to claim 8, wherein other areas of the display area of the second display that do not overlap with the external keyboard display a user interface. The portable electronic device according to claim 8, wherein the sensors include a plurality of Hall sensors, and the sensed part includes a magnet. The portable electronic device according to claim 8, wherein the sensors include a plurality of light sensors, and the sensed part includes a reflector. The portable electronic device according to claim 8, wherein the inclined arm portion of each elastic arm further has an upper inclined surface and a lower inclined surface opposite to the upper inclined surface, and the recess is located on the upper inclined surface . The portable electronic device according to claim 8, wherein the inclined arm portion of each elastic arm further has an upper inclined surface and a lower inclined surface opposite to the upper inclined surface, and the recess is located on the lower inclined surface . The portable electronic device according to claim 8, wherein each of the transparent keys includes a transparent key body, a transparent conductive layer covering the transparent key body, and a frame, and the transparent key body and the transparent conductive The layer is disposed in the frame, the transparent conductive layer has a top surface and a bottom surface opposite to the top surface, and the top surface and the bottom surface are exposed outside the frame. The portable electronic device according to claim 14, wherein the first connecting portion of each elastic arm is connected to the corresponding frame. The portable electronic device according to claim 8, wherein each transparent button has a pressing surface, and an extension direction of the oblique arm portion of each elastic arm is not perpendicular to the pressing of the corresponding transparent button A normal direction of the face. The portable electronic device according to claim 16, wherein the extension direction of the oblique arm portion of each of the elastic arms and a reference line perpendicular to the normal direction of the pressing surface of the corresponding transparent button An included angle between 45 degrees to 60 degrees.

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