CN108010760B

CN108010760B - Liftable keyboard structure

Info

Publication number: CN108010760B
Application number: CN201610969552.2A
Authority: CN
Inventors: 韩永隆; 黄启峰
Original assignee: Microjet Technology Co Ltd
Current assignee: Microjet Technology Co Ltd
Priority date: 2016-10-28
Filing date: 2016-10-28
Publication date: 2020-01-07
Anticipated expiration: 2036-10-28
Also published as: CN108010760A

Abstract

The utility model provides a keyboard structure of liftable, is applicable to portable computer, and it includes upper cover and base, and keyboard structure of liftable includes: at least one key, a thin film switch circuit layer and a micropump; each key is provided with a key cap and an elastic element; the film switch circuit layer is provided with an air inlet and an air outlet, and the air inlet is arranged corresponding to the opening of the cavity of the elastic element; the micropump includes: an inlet communicated with the air inlet and an outlet communicated with the air outlet; when the sensor of the base of the portable computer senses that the upper cover is close, the micropump is actuated, so that the gas in the cavity of the elastic element flows downwards through the air inlet of the film switch circuit layer and the inlet of the micropump from the opening and then flows to the exhaust port from the outlet to be exhausted, and the compression deformation of the elastic element drives the key cap to displace downwards so as to reduce the height of the key.

Description

Liftable keyboard structure

[ technical field ] A method for producing a semiconductor device

The present invention relates to a keyboard structure, and more particularly, to a liftable keyboard structure having a micro pump.

[ background of the invention ]

In the information age, computers have become indispensable electronic information products for every person. The peripheral input device most directly related to the user is a computer, comprising: a mouse, a keyboard, a writing pad …, wherein the keyboard device can be used for the user to directly type characters and symbols, and can be used for writing and editing various document files in a computer through the keyboard.

Please refer to fig. 1, which is an external view of a conventional keyboard. As shown in the figure, the keyboard 1 is suitable for a notebook computer, and has a bottom plate 11 and a plurality of keys 10, the arrangement of the plurality of keys 10 will be different according to the design of each manufacturer, but they mainly correspond to different english/chinese letters, numbers, symbols, etc. so that the user can press the keys 10 with fingers to trigger the corresponding signals, and can execute the corresponding functions in the computer.

Please refer to fig. 2, which is a schematic cross-sectional structure diagram of a conventional keyboard. As shown in the figure, the keyboard 1 has a bottom plate 11 and a plurality of keys 10, wherein each key 10 is composed of a key cap 101, a scissors-type connecting element 102 and an elastic element 103, the scissors-type connecting element 102 is connected to the key cap 101, and the elastic element 103 is disposed corresponding to the key cap 101. The bottom plate 11 of the key 1 sequentially includes a thin film switch circuit 12, a spacer 13, a supporting plate 14, and a lower housing 15, but not limited thereto, wherein the thin film switch circuit 12 includes an upper circuit board 121, an isolation layer 122, and a lower circuit board 123, and the upper circuit board 121, the isolation layer 122, and the lower circuit board 123 are made of a transparent material, but not limited thereto. And, there are a plurality of key switches 124 in the membrane switch circuit 12, and these key switches 124 are corresponding to the central position of each elastic element 103, so that when the user presses the key cap 101 of the key 10, a downward stress is generated, and the scissors-type connecting element 102 swings with the stretching, and the key cap 101 presses the elastic element 103 downward, so that the elastic element 103 is deformed by the stress, and further the key switch 124 of the membrane switch circuit 12 can be touched and pressed, and the key signal corresponding to the key 10 is output.

As shown in fig. 2, the supporting plate 14 of the bottom plate 11 is correspondingly disposed under the membrane switch circuit 12 for supporting the membrane switch circuit 12, and the lower housing 15 is correspondingly disposed under the supporting plate 14 for protecting the supporting plate 14 and the membrane switch circuit 12. In some conventional technologies, the spacers 13 are disposed on the membrane switch circuit 12 and are correspondingly disposed between each of the keys 10, and an accommodating space 131 is disposed between two adjacent spacers 13 for disposing the scissors-type connecting element 102 and the elastic element 103 of each corresponding key 10 therein. Therefore, as shown in the figure, the key cap 101 of the key 10 of the known keyboard 1 is higher than the spacer 13 due to the support of the scissors-type connecting element 102 and the elastic element 103, and when the user presses the key cap 101, the scissors-type connecting element 102 correspondingly stretches and swings, and the elastic element 103 correspondingly deforms downward to trigger the key switch 124 and output a corresponding key signal, at this time, the key cap 101 is lowered down to the height due to the pressing stress of the user, so that the key cap 101 sinks into the accommodating space 131 of the spacer 13; however, when the user stops pressing the key cap 101, the elastic element 103 deforms upward in response to the elastic restoring force, and further stops triggering the key switch 124, so that the output of the key signal can be stopped, at this time, the key cap 101 is pushed by the deformation of the elastic element 103 to move upward and reset, the scissors-type connecting element 102 is also driven by the key cap 101 to return to its initial state, and thus, the key cap 101 finally returns to its position higher than the spacer 13.

However, with the trend of thin design of light, thin and portable electronic devices in modern society, it is known that the keyboard 1 is difficult to reduce the overall height of the keycap 101 due to a certain height, and further the overall volume is difficult to reduce, which results in the disadvantage of heavy and light products. Therefore, how to develop a liftable keyboard structure that can improve the above-mentioned shortcomings of the known technology, improve the keyboard and key design, and further achieve the purpose of being light, thin and portable is a problem that needs to be solved urgently at present.

[ summary of the invention ]

The main objective of the present invention is to provide a liftable keyboard structure, which is actuated by a micro pump to pump air out of an elastic element of a key, so that the elastic element deforms and compresses downward to drive a key cap to move downward, thereby reducing the height of the key, i.e., reducing the overall thickness of the liftable keyboard structure, so that the overall thickness of the liftable keyboard structure can be reduced when a portable computer is closed and closed by an upper cover, and the purpose of light and thin design can be achieved.

To achieve the above object, a broader aspect of the present invention is to provide a liftable keyboard structure suitable for a portable computer, the portable computer including an upper cover and a base, the base having an inductor, the liftable keyboard structure comprising: at least one key, each key has a key cap and an elastic element, the elastic element is arranged corresponding to the key cap and has a cavity; a thin film switch circuit layer having at least one air inlet and at least one air outlet, the at least one air inlet being disposed corresponding to an opening of the cavity of the elastic element; and a micropump correspondingly disposed below the thin film switch circuit layer, and including: the inlet is communicated with the at least one air inlet of the membrane switch circuit layer, and the outlet is communicated with the at least one exhaust port of the membrane switch circuit layer; when the sensor of the base of the portable computer senses that the upper cover is close, the micropump is pumped to actuate, so that the gas in the cavity of the elastic element flows downwards from the opening of the cavity through the at least one gas inlet of the film switch circuit layer and the inlet of the micropump in sequence, enters the micropump, flows to the at least one gas outlet of the film switch circuit layer from the outlet and is discharged, and the cavity of the elastic element is pumped out due to the gas to generate compression deformation of the elastic element, so that the key cap is driven to move downwards, and the height of the at least one key is reduced.

To achieve the above object, another broader aspect of the present invention is to provide a liftable keyboard structure suitable for a portable computer, the portable computer including an upper cover and a base, the base having an inductor, the liftable keyboard structure including: at least one key, each key has a key cap and an elastic element, the elastic element is arranged corresponding to the key cap and has a cavity; a thin film switch circuit layer having at least one air inlet and at least one air outlet, the at least one air inlet being disposed corresponding to an opening of the cavity of the elastic element; and a micro pump correspondingly disposed below the thin film switch circuit layer, and including: the inlet is communicated with the at least one air inlet of the membrane switch circuit layer, and the outlet is communicated with the at least one exhaust port of the membrane switch circuit layer; when the sensor of the base of the portable computer senses that the upper cover is close, the piezoelectric actuator of the micro pump is actuated, so that the volume of a gas collection cavity in the micro pump is changed, pressure difference is generated to push gas to flow, the gas in the cavity of the elastic element is enabled to flow from the opening of the cavity downwards to the inlet of the micro pump through the at least one gas inlet of the film switch circuit layer and then to the outlet through the pumping action of the micro pump, and the gas is exhausted through the at least one gas outlet of the film switch circuit layer, so that the cavity of the elastic element generates compression deformation due to gas pumping, and the key cap is driven to move downwards, and the height of the at least one key is reduced.

[ description of the drawings ]

Fig. 1 is an external view of a conventional keyboard.

Fig. 2 is a schematic cross-sectional structure diagram of a conventional keyboard.

Fig. 3 is a schematic diagram illustrating a lifting operation of the liftable keyboard structure according to the preferred embodiment of the present disclosure.

Fig. 4A is a schematic cross-sectional view of a liftable keyboard structure and a micro pump thereof according to a preferred embodiment of the present invention.

Fig. 4B is a schematic diagram of the liftable keyboard structure shown in fig. 4A and the lifting operation of the micro pump thereof.

[ notation ] to show

1: keyboard with a keyboard body

10: push-button

101: key cap

102: scissor type connecting element

103: elastic element

11: base plate

12: thin film switch circuit

121: upper circuit board

122: insulating layer

123: lower circuit board

124: push-button switch

13: spacer member

131: containing space

14: supporting plate

15: lower casing

2: portable computer

2 a: upper cover

2a 1: magnetic element

2 b: base seat

2b 1: inductor

20: liftable keyboard structure

21. 21', 21 ": push-button

210: key cap

211: scissors type element

212: elastic element

212 a: cavity body

212b, and (3 b): opening of the container

22: thin film switch circuit layer

221: air inlet

222: exhaust port

23: micropump

230: outlet plate

230 a: inlet port

230 b: an outlet

230 c: inlet temporary storage cavity

230 d: outlet temporary storage cavity

230 e: connecting channel

230f, 232 d: convex part structure

231: valve plate

231 a: valve bore

232: air collecting plate

232 a: air-collecting chamber

232 b: the first through hole

232 c: second through hole

233: piezoelectric actuator

233 a: suspension plate

233 b: piezoelectric ceramic plate

234: resonance sheet

234 a: hollow hole

235: air inlet plate

235 a: air intake

235 b: bus bar hole

235 c: central concave part

236: conductive sheet

237a, 237 b: insulating sheet

h: distance of displacement

[ detailed description ] embodiments

Exemplary embodiments that embody features and advantages of this disclosure are described in detail below in the detailed description. It will be understood that the present disclosure is capable of various modifications without departing from the scope of the disclosure, and that the description and drawings are to be regarded as illustrative in nature, and not as restrictive.

Please refer to fig. 3, which is a schematic diagram illustrating a lifting operation of a keyboard according to a preferred embodiment of the present disclosure. As shown in the drawings, the liftable keyboard structure 20 of the present disclosure is applied to a portable computer 2, for example: in a notebook computer, a palm-type electronic device or other portable electronic devices, taking the embodiment as an example, the portable computer 2 may be, but is not limited to, a notebook computer. In this embodiment, the portable computer 2 has an upper cover 2a and a base 2b, the base 2b can be but is not limited to a box structure for accommodating the liftable keyboard structure 20 and the circuit board and electronic components therein, and the upper cover 2a correspondingly covers the base 2b to protect the liftable keyboard structure 20 of the base 2b and the circuit board and electronic components therein, so as to facilitate carrying and use by a user. The liftable keyboard structure 20 includes a plurality of

keys

21, 21 ', 21 ″, but the number and the configuration of the plurality of

keys

21, 21', 21 ″ may be changed according to the actual implementation situation, and the embodiment shown in the present disclosure is not limited thereto.

In some embodiments, a sensor 2b1 is disposed in the base 2b, and the sensor 2b1 may be an electromagnetic sensor or an optical sensor, but not limited to, for sensing whether the cover 2a is close to and covers the base 2b, for example, when the sensor 2b1 is an electronic sensor, such as: the hall sensor also has a corresponding magnetic element 2a1 on the top cover 2a, so that, as shown in fig. 3, the sensor 2b1 on the base 2b can sense the distance of the magnetic element 2a1 on the top cover 2a, and when the top cover 2a is not covered on the base 2b as shown in the state (a), the sensor 2b1 will not sense the magnetic element 2a1 and will not generate related signals because the magnetic element 2a1 of the top cover 2a is far from the sensor 2b1 on the base 2 b. However, when the upper cover 2a is rotated and the upper cover 2a is located at a specific angle, the distance between the magnetic element 2a1 and the sensor 2b1 reaches a specific value, that is, the sensor 2b1 senses the existence of the magnetic element 2a1, so as to generate an electromagnetic signal, trigger the air-extracting action of the micro-pump 23 (as shown in fig. 4A), and further make the plurality of

keys

21, 21', 21 ″ of the liftable keyboard structure 20 move downward to reduce the height, so that the upper cover 2a can cover the base 2b downward as shown in the (b) state, and the height of the liftable keyboard structure 20 is reduced, thereby reducing the overall thickness of the portable computer 2, and further making the portable computer 2 achieve the purposes of lightness, thinness and portability.

Please refer to fig. 4A, which is a schematic cross-sectional view of a liftable keyboard structure and a micro pump thereof according to a preferred embodiment of the present disclosure. As shown in the figure, the liftable keyboard structure 20 of the present embodiment includes at least one key 21, a membrane switch circuit layer 22, and a micro pump 23, and the at least one key 21, the membrane switch circuit layer 22, and the micro pump 23 are correspondingly disposed in the base 2b of the portable computer 2. In the embodiment, for convenience of description, a single key 21 is adopted for illustration, but in other embodiments, the number and the arrangement of the keys 21 may be changed arbitrarily according to practical implementation situations, and is not limited thereto. In the embodiment, the key 21 has a key cap 210, a scissor element 211, and an elastic element 212, wherein the key cap 210 is a n-shaped cover-shaped structure and can be made of a plastic material, but not limited thereto, the scissor element 211 is connected to the key cap 210 and the elastic element 212 for supporting and driving the key cap 210. The elastic element 212 is correspondingly disposed under the key cap 210, in some embodiments, the elastic element 212 is not in contact with the key cap 210 in the initial state, but in other embodiments, the elastic element 212 may also be in contact with the key cap 210 in the initial state, and the disposition manner thereof may be adjusted according to actual implementation conditions, and is not limited thereto. And, the elastic element 212 is in the form of a hollow cap structure, which can be made of elastic material, such as: rubber, but not limited to, and having a cavity 212a therein, the bottom of the cavity 212a having an opening 212b, when the air inside the cavity 212a is pumped away, the elastic element 212 will generate compression deformation, and further the scissors element 211 can drive the key cap 210 to move downward, thereby reducing the height of the key 21.

Referring to fig. 3, fig. 4A and fig. 4B, as shown in fig. 4A, the membrane switch circuit layer 22 and the micro pump 23 are correspondingly disposed below the key 21 in sequence, wherein the membrane switch circuit layer 22 has at least one air inlet 221 and at least one air outlet 222, in some embodiments, the at least one air inlet 221 may be an annular opening structure, but not limited thereto, and the air inlet 221 is disposed corresponding to the opening 212B of the cavity 212a of the elastic element 212 of the key 21, so that the air inlet 221 can communicate with the cavity 212a through the opening 212B. In the present embodiment, the micro pump 23 is formed by stacking an outlet plate 230, a valve plate 231, a gas collecting plate 232, an insulating plate 237a, a conductive plate 236, another insulating plate 237b, a pressure actuator 233, a resonator 234, and a gas inlet plate 235 in sequence. The piezoelectric actuator 233 is provided corresponding to the resonator plate 234, and the piezoelectric actuator 233 is assembled by a suspension plate 233a and a piezoelectric ceramic plate 233 b. In some embodiments, the outlet plate 230 has an inlet 230a, an outlet 230b, an inlet buffer chamber 230c, an outlet buffer chamber 230d, and a communication channel 230e, wherein one side of the inlet 230a is connected to the inlet 221 of the membrane switch circuit layer 22, the other side is connected to the inlet buffer chamber 230c, one side of the outlet 230b is connected to the outlet 222 of the membrane switch circuit layer 22, and the other side is connected to the outlet buffer chamber 230d, wherein the inlet buffer chamber 230c and the outlet buffer chamber 230d are both used for temporarily storing gas, and the communication channel 230e is connected between the inlet buffer chamber 230c and the outlet buffer chamber 230d for communicating gas. In the present embodiment, a protruding structure 230f may be further added to the end of the outlet 230b, for example, but not limited to, a cylindrical structure. The valve plate 231 further has a valve hole 231a, wherein the valve hole 231a corresponds to the inlet 230a and the inlet buffer chamber 230 c. The gas collecting plate 232 has a first through hole 232b and a second through hole 232c, wherein one end of the first through hole 232b and the second through hole 232c are connected to the gas collecting chamber 232a, and the other end thereof is connected to the inlet buffer chamber 230c and the outlet buffer chamber 230d, respectively. And, a protrusion 232d is further added near the first through hole 232b, such as but not limited to a cylinder, and is disposed corresponding to the valve hole 231a of the valve plate 231. Therefore, when the valve plate 231, the outlet plate 230 and the gas collecting plate 232 are positioned and assembled, the valve hole 231a is correspondingly arranged corresponding to the convex part structure 232d of the gas collecting plate 232, and the single valve hole 231a is designed to enable the gas to achieve the purpose of unidirectional flow according to the pressure difference.

In some embodiments, the micro pump 23 further has an insulation sheet 237a, a conductive sheet 236 and another insulation sheet 237b, which are sequentially stacked on the piezoelectric actuator 233 and have a shape substantially corresponding to the shape of the outer frame of the piezoelectric actuator 233. In some embodiments, the insulating

sheets

237a and 237b are made of an insulating material, such as: plastic, but not limited to this, for insulation; in other embodiments, the conductive sheet 236 is made of a conductive material, such as: but not limited to, metals for electrical conduction.

In the present embodiment, the piezoelectric actuator 233 is disposed under the gas collecting plate 232 and is assembled by the suspension plate 233a and the piezoelectric ceramic plate 233b for driving the micro pump 23. The gas collecting chamber 232a is defined between the gas collecting plate 232 and the piezoelectric ceramic plate 233b of the piezoelectric actuator 233, and the gas collecting chamber 232a is connected to the inlet buffer chamber 230c through the first through hole 232b and is also connected to the second through hole 232 c.

And, the resonator plate 234 and the air inlet plate 235 are further disposed under the piezoelectric actuator 233, the resonator plate 234 is made of a flexible material, but not limited thereto, and the resonator plate 12 has a hollow hole 234a, in some embodiments, the resonator plate may be made of a copper material, but not limited thereto. The air inlet plate 235 has at least one air inlet hole 235a, which is mainly used for allowing air to flow from the at least one air inlet hole 235a into the micro pump 23 by the action of atmospheric pressure outside the device. As shown, the air inlet plate 235 has at least one bus hole 235b, which is communicated with the air inlet hole 235a, and can guide the air from the air inlet hole 235a, collect the air to a central recess 235c, and transmit the air upward through the hollow hole 234a corresponding to the central recess 235 c. In other embodiments, the material of the air inlet plate 11 may be, but is not limited to, a stainless steel material.

Referring to fig. 4A and 4B, as shown in fig. 4A, when the micro pump 23 is not operated, the gas enters the micro pump 23 through the gas inlet hole 235a of the gas inlet plate 235, and is transmitted to the central recess 235c through the bus hole 235B, and then flows through the hollow hole 234A of the resonator plate 12 to enter the gas collecting chamber 232a, and then enters the inlet temporary storage chamber 230c and the outlet temporary storage chamber 230d through the first through hole 232B and the second through hole 232c of the gas collecting plate 232, at this time, because the gas continuously enters from the gas inlet hole 235a, so as to generate a pressure difference, the valve plate 231 is pushed upward, so as to open the valve hole 231a on the valve plate 231, so that the gas can flow into the inlet temporary storage chamber 230c from the valve hole 231a, and then is transmitted into the cavity 212a of the elastic element 212 through the gas inlet 221 of the thin film switch circuit layer 22, so that the elastic element 212 maintains the original state, and the scissors element 211 supports the key cap 210 to maintain the height of the key 21 for the user to press. At this time, since the valve plate 231 is deformed upward, the other side of the valve plate 231 will abut against the convex portion 230f of the outlet plate 230, and further close the outlet 230b, i.e. the gas in the micro pump 23 cannot be transported from the outlet 230b to the exhaust port 222 of the membrane switch circuit layer 22, so no gas is discharged.

However, when the micro pump 23 receives the electromagnetic signal transmitted by the sensor 2B1, the piezoelectric actuation of the piezoelectric actuator 233 causes the piezoelectric ceramic plate 233B of the piezoelectric actuator 233 to drive the floating plate 233a to move downward, which results in the volume of the air collecting chamber 232a becoming larger, and the gas flows in a manner that the floating plate 233a moves downward and approaches the resonator plate 234, which causes the resonator plate 234 to vibrate downward, so that the gas is pushed from the central recess 235c to the bus holes 235B on both sides and is exhausted from the air inlet holes 235a of the air inlet plate 235, as shown in fig. 4B. And, because the volume of the gas collecting chamber 232a is increased, so as to generate a pressure difference, the gas flows into the gas collecting chamber 232a from the first through hole 232b and the second through hole 232c of the gas collecting plate 232, and the valve plate 231 moves downward along with the gas, so that the valve plate 231 abuts against the convex portion structure 232d downward, and the valve hole 231c is closed, that is, the gas in the inlet temporary storage cavity 230c does not flow backward downward; meanwhile, the valve plate 231 on the other side will also move downward, so as to connect the outlet 230b of the outlet plate 230 with the outlet temporary storage chamber 230d, and can be communicated with the outside through the exhaust port 222 of the membrane switch circuit layer 22, so that the gas can flow into the inlet temporary storage cavity 230c from the inlet 230a of the outlet plate 230, then flow to the outlet temporary storage cavity 230d through the communication channel 230e, and finally be discharged out of the liftable keyboard structure 20 through the exhaust port 222 from the outlet 230b of the outlet plate 230, whereby the gas in the cavity 212a of the elastic element 212 can be pumped out and compressed by the action of the micro pump 23, and the key cap 210 of the key 21 is displaced downward by a distance of h, to lower the height of the key 21, and the overall thickness of the liftable keyboard structure 20 is reduced, so that the portable computer 2 can achieve the purposes of lightness, thinness and portability.

In summary, the liftable keyboard structure provided by the present disclosure is applied to a portable computer, and is activated by matching with a sensor of a base thereof, and the liftable keyboard structure includes a key, a membrane switch circuit layer, a micro pump and other structures arranged in sequence, when the sensor senses that an upper cover is close, a trigger signal is transmitted to the micro pump, and the micro pump activates to pump an elastic element in the key, so that the elastic element deforms and compresses downward to drive a key cap of the key to displace downward, thereby reducing the height of the key, and reducing the overall thickness of the liftable keyboard structure, so that when the upper cover of the portable computer is closed, the overall thickness can be further reduced, and the purpose of light and thin design is achieved; therefore, the liftable keyboard structure can automatically detect the approach of the upper cover to enable the liftable keyboard structure to descend, further reduce the overall size and thin the keyboard structure so as to achieve the purposes of light weight and comfort, and has great industrial application value.

While the present invention has been described in detail with respect to the above embodiments, it will be apparent to those skilled in the art that various modifications can be made without departing from the scope of the invention as defined in the appended claims.

Claims

1. A liftable keyboard structure is suitable for a portable computer, and the portable computer includes an upper cover and a base, and the base has an inductor, and its characterized in that, the liftable keyboard structure includes:

at least one key, each key has a key cap and an elastic element, the elastic element is arranged corresponding to the key cap and has a cavity;

a thin film switch circuit layer having at least one air inlet and at least one air outlet, the at least one air inlet being disposed corresponding to an opening of the cavity of the elastic element; and

a micro pump correspondingly disposed below the thin film switch circuit layer, and including: the inlet is communicated with the at least one air inlet of the membrane switch circuit layer, and the outlet is communicated with the at least one exhaust port of the membrane switch circuit layer;

when the sensor of the base of the portable computer senses that the upper cover is close, the micropump is pumped to actuate, so that the gas in the cavity of the elastic element flows downwards from the opening of the cavity through the at least one gas inlet of the film switch circuit layer and the inlet of the micropump in sequence, enters the micropump, flows to the at least one gas outlet of the film switch circuit layer from the outlet and is discharged, and the cavity of the elastic element is pumped out due to the gas to generate compression deformation of the elastic element, so that the key cap is driven to move downwards, and the height of the at least one key is reduced.

2. The liftable keyboard structure of claim 1, wherein each of the keys further comprises a scissors element, and the scissors element is connected to the key cap and the elastic element for supporting and driving the key cap to move.

3. The liftable keyboard structure of claim 1, wherein the micro pump further comprises:

the outlet plate is provided with the inlet, an inlet temporary storage cavity, the outlet, an outlet temporary storage cavity and a connecting channel, one side of the inlet is communicated with the air inlet of the membrane switch circuit layer, the other side of the inlet is communicated with the inlet temporary storage cavity, one side of the outlet is communicated with the air outlet of the membrane switch circuit layer, the other side of the outlet is communicated with the outlet temporary storage cavity, and the connecting channel is communicated between the inlet temporary storage cavity and the outlet temporary storage cavity;

the air collecting plate is arranged below the outlet plate;

a valve plate arranged between the outlet plate and the gas collecting plate and provided with a valve hole;

the piezoelectric actuator is arranged below the gas collecting plate and is provided with a suspension plate and a piezoelectric ceramic plate, and a gas collecting cavity is defined between the piezoelectric ceramic plate and the gas collecting plate;

a resonant plate having a hollow hole; and

the air inlet plate is provided with at least one air inlet hole, at least one bus bar hole and a central concave part, wherein the at least one air inlet hole is used for introducing air, the bus bar hole corresponds to the air inlet hole, and the bus bar hole guides the air in the air inlet hole to be converged to the central concave part;

when the sensor of the base of the portable computer senses that the upper cover is close, the piezoelectric actuator of the micropump is actuated, the suspension plate is driven by a voltage to be bent and deformed, the volume of the gas collecting cavity is changed, and then pressure difference is generated to push gas to flow, so that the gas flows through the inlet temporary storage cavity, the communication channel and the outlet temporary storage cavity from the inlet, flows out of the micropump from the outlet and is discharged through the at least one gas outlet of the thin film switch circuit layer.

4. The liftable keyboard structure of claim 3, wherein the micro pump further comprises at least one insulating sheet and one conducting sheet, and the at least one insulating sheet and the conducting sheet are disposed on the piezoelectric actuator.

5. The liftable keyboard structure of claim 3, wherein the gas collecting plate of the micro pump further comprises a first through hole and a second through hole, one end of the first through hole and one end of the second through hole are connected to the gas collecting chamber, and the other end of the first through hole and the other end of the second through hole are respectively connected to the inlet buffer chamber and the outlet buffer chamber.

6. The liftable keyboard structure of claim 5, wherein the micro pump further comprises a plurality of protrusion structures, one of the protrusion structures is disposed at one end of the outlet, and the other protrusion structure is disposed at one side of the first through hole for abutting against the valve plate during operation.

7. The liftable keyboard structure of claim 1, wherein the sensor of the base is an electromagnetic sensor, and the top cover further comprises a magnetic element, the electromagnetic sensor being configured to sense a distance between the magnetic element and generate an electromagnetic signal.

8. A liftable keyboard structure is suitable for a portable computer, the portable computer includes an upper cover and a base, the base has a sensor, characterized in that, the liftable keyboard structure has:

when the sensor of the base of the portable computer senses that the upper cover is close, the piezoelectric actuator of the micro pump is actuated, so that the volume of a gas collection cavity in the micro pump is changed, pressure difference is generated to push gas to flow, the gas in the cavity of the elastic element is enabled to flow from the opening of the cavity downwards to the inlet of the micro pump through the at least one gas inlet of the film switch circuit layer and then to the outlet through the pumping action of the micro pump, and the gas is exhausted through the at least one gas outlet of the film switch circuit layer, so that the cavity of the elastic element generates compression deformation due to gas pumping, and the key cap is driven to move downwards, and the height of the at least one key is reduced.

9. The liftable keyboard structure of claim 8, wherein each of the keys further comprises a scissors element, and the scissors element is connected to the key cap and the elastic element for supporting and driving the key cap to move.

10. The liftable keyboard structure of claim 8, wherein the micro pump further comprises:

the air collecting plate is arranged below the outlet plate;

a resonant plate having a hollow hole; and

11. The liftable keyboard structure of claim 10, wherein the micro pump further comprises at least one insulating sheet and one conducting sheet, and the at least one insulating sheet and the conducting sheet are disposed on the piezoelectric actuator.

12. The liftable keyboard structure of claim 10, wherein the gas collecting plate of the micro pump further comprises a first through hole and a second through hole, one end of the first through hole and one end of the second through hole are connected to the gas collecting chamber, and the other end of the first through hole and the other end of the second through hole are respectively connected to the inlet buffer chamber and the outlet buffer chamber.

13. The liftable keyboard structure of claim 12, wherein the micro pump further comprises a plurality of protrusion structures, one of the protrusion structures is disposed at one end of the outlet, and the other protrusion structure is disposed at one side of the first through hole for abutting against the valve plate during operation.

14. The liftable keyboard structure of claim 8, wherein the sensor of the base is an electromagnetic sensor, and the top cover further comprises a magnetic element, the electromagnetic sensor being configured to sense a distance between the magnetic element and generate an electromagnetic signal.