WO2023134384A1 - 薄膜键盘 - Google Patents

薄膜键盘 Download PDF

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Publication number
WO2023134384A1
WO2023134384A1 PCT/CN2022/139289 CN2022139289W WO2023134384A1 WO 2023134384 A1 WO2023134384 A1 WO 2023134384A1 CN 2022139289 W CN2022139289 W CN 2022139289W WO 2023134384 A1 WO2023134384 A1 WO 2023134384A1
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WO
WIPO (PCT)
Prior art keywords
board
membrane keyboard
capacitive sensing
flexible circuit
sensed
Prior art date
Application number
PCT/CN2022/139289
Other languages
English (en)
French (fr)
Inventor
李海涛
雷平平
许慧杰
Original Assignee
荣耀终端有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 荣耀终端有限公司 filed Critical 荣耀终端有限公司
Publication of WO2023134384A1 publication Critical patent/WO2023134384A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/705—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
    • H01H13/7065—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys characterised by the mechanism between keys and layered keyboards
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/705—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
    • H01H13/7065—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys characterised by the mechanism between keys and layered keyboards
    • H01H13/7073—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys characterised by the mechanism between keys and layered keyboards characterised by springs, e.g. Euler springs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/84—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by ergonomic functions, e.g. for miniature keyboards; characterised by operational sensory functions, e.g. sound feedback
    • H01H13/85—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by ergonomic functions, e.g. for miniature keyboards; characterised by operational sensory functions, e.g. sound feedback characterised by tactile feedback features
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches
    • H03K17/9622—Capacitive touch switches using a plurality of detectors, e.g. keyboard

Definitions

  • the present application relates to the technical field of keyboards, in particular, to membrane keyboards.
  • Membrane keyboards have become the most sold keyboards due to their advantages of thinness, low price, and low noise. They can be used with personal desktop computers, or integrated into notebook computers as the keyboard part of notebook computers.
  • the embodiments of the present application provide a membrane keyboard to solve the problems of poor key feel or poor corner function of known membrane keyboards.
  • An embodiment of the present application provides a membrane keyboard, which includes a support plate, a conductive film, a flexible circuit board, and multiple sets of pressing components.
  • the support plate has opposite first and second surfaces.
  • the conductive film is stacked on one side of the first surface of the support plate; the conductive film is provided with a first area and a second area, and the conductive film is distributed with contact pairs in the first area, and the contact pairs can be electrically connected under pressure to generate corresponding key position signal.
  • the flexible circuit board is disposed on one side of the second surface of the supporting board and extends to at least partly correspond to the second area. Part of the multiple groups of pressing components is the first pressing component, and part is the second pressing component.
  • the first pressing assembly includes a first keycap and a first support structure, the first keycap is compressibly supported on the support plate by the first support structure and corresponds to the pair of contacts, and the first keycap can be pressed so that the contacts The point pair conducts, and generates the key position signal corresponding to the position.
  • the second pressing assembly includes a second keycap, a sensed part and a second support structure, the second keycap is supported on the support plate by the second support structure, and the sensed part is arranged on the second keycap.
  • the flexible circuit board is integrated with a capacitive sensing circuit, the capacitive sensing circuit includes a capacitive sensing structure, the capacitive sensing structure corresponds to the second area and corresponds to the pressed direction of the sensed part along the second keycap, and when the second keycap is pressed,
  • the capacitance sensing circuit can sense the capacitance value change between the capacitance sensing structure and the sensed part, and when the capacitance value reaches the capacitive conduction threshold of the capacitance sensing circuit, a key signal corresponding to the position is generated.
  • Part of the pressing component (second pressing component) of the membrane keyboard in the embodiment of the present application is provided with a flexible circuit board and a capacitive sensing circuit on it, and through the induced part and the corresponding capacitive sensing structure set on the second keycap when pressing a key Capacitance value changes between the keys to achieve non-contact triggering of key position signals, especially for long keys with poor corner functions (such as space keys, etc.), which can be realized at low cost while maintaining the key stroke and the overall thickness of the keyboard. , solve the problem of poor function of the corner, improve the reliability of the button, and have a wide application prospect.
  • the sensed part is made of conductive silica gel or conductive foam.
  • the sensed part is made of conductive silica gel or conductive foam.
  • the capacitance value between the sensed part and the capacitive sensing structure changes gradually, which can be processed to obtain a key signal.
  • the sensed part is in the shape of a sheet or a strip, and the sensed part is bonded or clamped to the surface of the second keycap facing the conductive film.
  • the sheet-shaped or strip-shaped inductive element is connected to the side of the second keycap facing the conductive film by bonding or clamping, which is convenient for connection.
  • the capacitive sensing structure includes a mountain-shaped first line and a U-shaped second line, the first line and the second line are spaced apart from each other, and the first line is electrically connected to the capacitive signal processing unit at the system end. VCC+ interface, the second line is electrically connected to the GND interface of the capacitive signal processing unit at the system end, so that an electric field is formed between the first line and the second line, and when the sensed part approaches or moves away from the capacitive sensing structure, the electric field will be cut, thereby changing The capacitance between the sensed part and the capacitive sensing structure.
  • the first lines of the three branches and the second lines of the two branches are intersected at intervals to form a capacitive structure with multiple sets of intervals, which can be sensitively adjusted according to the position change of the sensed part.
  • key position signals can be sensitively given according to the displacement of the second keycap.
  • the support plate is a metal plate, and a through hole is opened on the support plate corresponding to the sensed part.
  • the support plate is a metal plate, and through holes are only opened at the corresponding parts to be sensed.
  • the metal plate can shield the displacement of the metal parts that may exist in other positions of the membrane keyboard from interfering with the induction of the capacitive sensing structure.
  • the opened through hole can prevent the support plate from affecting the sensing of the sensed part by the capacitive sensing structure, thereby ensuring that the capacitive sensing structure can accurately sense the displacement of the sensed part.
  • the second pressing assembly includes a space bar pressing assembly
  • the space bar pressing assembly includes a space bar cap, two scissor brace structures and an elastic support member, and the two scissor brace structures are respectively supported on the space bar cap.
  • the elastic supporting member is supported at the middle position in the longitudinal direction of the space bar cap, and the elastic supporting member and the two scissor brace structures together constitute the second supporting structure of the space bar pressing assembly.
  • There are two sensed parts in the space bar pressing assembly and the two sensed parts are respectively located between the elastic support part and the two scissors support structures.
  • the flexible circuit board includes a first board section, which extends parallel to the length of the space bar and corresponds to the space bar cap, and is provided with capacitive sensing structures respectively corresponding to the two sensed parts.
  • the space bar is used as a longer button, and it is more difficult to improve its corner function by using the existing technology (for example, it needs to be realized by increasing the wall thickness of the space bar cap and improving the structural rigidity of the support plate), and in the implementation mode,
  • the scissor support on both sides and the elastic support in the middle are used as supports to improve the feel of the keys to a certain extent.
  • the contacts are in contact with each other, and the required key effect can be achieved by setting the capacitive conduction threshold appropriately.
  • the elastic support member can provide elastic support, and the touch feeling of the key can be set to be consistent with that of a conventional key.
  • the first board section corresponding to the space bar is additionally arranged on the surface of the flexible circuit board, and the corner function of the space bar can be better solved, and the increased cost is small.
  • the membrane keyboard includes a backlight module, and the backlight module includes a backlight panel and a light source assembly.
  • the backlight board is arranged on the side of the second surface of the support board, the light source assembly includes a light source circuit integrated in the flexible circuit board, and the light source circuit includes an LED lamp capable of energizing and emitting light; the flexible circuit board is located on the side of the backlight board away from the support board.
  • the light source assembly of the backlight module and the aforementioned capacitive sensing circuit are integrated on the flexible circuit board on the back of the backlight board, which improves the utilization efficiency of the flexible circuit board.
  • the capacitive sensing circuit used in part of the pressing component (second pressing component) is integrated into the flexible circuit board to realize the capacitive sensing button function, The cost increase to the membrane keypad is small.
  • the flexible circuit board includes a second board segment, the second board segment is connected to one end of the first board segment, and forms an L-shaped flexible circuit board with the first board segment.
  • the flexible circuit board integrates the light source circuit and the capacitive sensing circuit at the same time, and the utilization rate of the flexible circuit board is high.
  • the light source circuit further includes a plurality of resistors, and the LED lamp and the resistors are connected in parallel to the power supply of the light source circuit after being connected in series.
  • the resistance and the LED board are integrated on the flexible circuit board, the structure is simple and the size is small, and the cost of providing the light source is low.
  • the second pressing component is used for each key of the membrane keyboard whose length is greater than its width.
  • the second pressing component is used for the buttons with a large length, and the button is triggered by capacitive sensing, which can solve the problem of poor function at the corners of these buttons and affect the hand feel at low cost.
  • the flexible circuit board includes a fourth board part, a fifth board part and a sixth board part.
  • the fourth board part corresponds to the column where the left shift key of the membrane keyboard is located
  • the fifth board part corresponds to the column where the right shift key of the membrane keyboard is located
  • the sixth board part corresponds to the row where the space bar of the membrane keyboard is located
  • the fourth board part, The sixth board part and the fifth board part are connected in sequence.
  • the flexible circuit board has a small area and can better Covers the usual long keys of membrane keyboards.
  • FIG. 1 is a schematic structural view of a membrane keyboard according to an embodiment of the present application
  • Fig. 2 is a three-dimensional view of the button assembly of the membrane keyboard in Fig. 1;
  • Fig. 3 is another perspective view of the button assembly of Fig. 2;
  • Fig. 4 is an expanded view of the button assembly of Fig. 2;
  • Fig. 5 shows a schematic diagram of the cooperative relationship between the space bar pressing assembly, the conductive film, the support plate, the flexible circuit board, and the backlight module;
  • FIG. 6 A plan view of the conductive film is shown in Figure 6;
  • FIG. 7 A plan view of the support plate is shown in Figure 7;
  • Figure 8 shows the layout of the capacitive sensing circuit and the light source circuit on the flexible circuit board
  • Fig. 9 is an enlarged view of place A of Fig. 8.
  • FIG. 10 is a schematic diagram of a capacitive sensing circuit and a light source circuit on a flexible circuit board
  • FIG. 11 is a three-dimensional view of a key assembly of a membrane keyboard according to another embodiment of the present application.
  • FIG. 12 is a plan view of the back side of FIG. 11 .
  • the first pressing component 24a The first pressing component 24a
  • the first area S1 is the first area S1
  • the second area S2 is the second area S2
  • This embodiment provides a membrane keyboard 10, which can be a keyboard used independently or attached to a complete machine such as a notebook computer.
  • the membrane keyboard 10 in this embodiment includes a casing 11 and a key assembly 20 mounted on the casing 11 .
  • the user can input information by pressing the keys of the key assembly 20 .
  • the number and layout of the keys of the key assembly 20 can be arranged according to the 79 keys, 83 keys, 87 keys, 93 keys, 96 keys, 101 keys, 102 keys, 104 keys, 107 keys and other forms of common keyboards.
  • the keys of the membrane keyboard 10 in this embodiment include several common keys whose length and width are substantially equal and several long keys whose length is longer than the width. A typical long key mainly has a space bar.
  • the membrane keyboard 10 in this embodiment further includes a touchpad 12 for replacing a common mouse.
  • the touch panel 12 is an existing structure, which will not be repeated here. In other embodiments, the touch panel 12 may not be provided.
  • the housing 11 encloses an inner space Q1 , and the housing 11 defines keyholes K1 corresponding to the number of keys. Each keyhole K1 communicates with the inner space Q1 of the housing 11 for exposing the key assembly 20 .
  • the button assembly 20 provided by the embodiment of the present application includes a support plate 21 , a conductive film 22 , a flexible circuit board 23 and multiple sets of pressing assemblies 24 .
  • the key assembly 20 is further provided with a backlight module 25 , and the backlight module 25 includes a backlight panel 26 and a light source assembly 27 .
  • the support plate 21 has opposite first surface P1 and second surface P2, the conductive film 22 is stacked on the side of the first surface P1 of the support plate 21, and the flexible circuit board 23 is arranged on the support plate 21 on the second surface P2 side.
  • Each group of pressing components 24 is arranged on the side of the first surface P1 of the support plate 21 .
  • the backlight board 26 can be arranged between the supporting board 21 and the flexible circuit board 23 , and the light source assembly 27 is integrated on the flexible circuit board 23 .
  • the light source provided by the light source assembly 27 provides backlight after passing through the backlight plate 26 .
  • the backlight plate 26 , the support plate 21 , and the conductive film 22 are roughly in a rectangular plate-like structure, and the three are sequentially stacked from bottom to top and connected to the bottom surface of the inner space Q1 of the housing 11
  • Each group of pressing components 24 is respectively connected to the support plate 21 or the conductive film 22, and is respectively exposed from the corresponding key holes K1 on the casing 11, so as to facilitate the user to operate the keys.
  • the flexible circuit board 23 only needs to cover a part of the position (described in detail later), and its board size can be set to be much smaller than the board size of the backlight board 26/support board 21/conductive film 22, thereby having Minor structural costs.
  • a groove for accommodating the flexible circuit board 23 can be formed in the housing 11 or the backlight board 26 corresponding to the position of the flexible circuit board 23 (not shown in the figure) , so as to prevent the flexible circuit board 23 from increasing the overall thickness of the membrane keyboard 10 . Since the board size of the flexible circuit board 23 can be set smaller, the arrangement of the groove has little influence on the overall structural performance of the membrane keyboard 10 .
  • an avoidance hole K2 needs to be opened on the conductive film 22 to allow the pressing component 24 to pass through and be connected to the support plate 21 . Due to the limited space on the surface of the conductive film 22, the setting of the avoidance hole K2 may easily affect the layout of the conductive circuit thereon. Moreover, the position of the avoidance hole K2 needs to have high accuracy, so as to avoid the interference between the pressing component 24 and the conductive film 22 during assembly and affect the connection with the support plate 21 .
  • the conductive film 22 is provided with a first region S1 and a second region S2, and the conductive film 22 is distributed with a plurality of contact pairs (not shown in the figure) in the first region S1, corresponding to the contacts in the first region S1.
  • a plurality of pressing components 24 The contact pair can be electrically conducted under pressure to generate a key position signal corresponding to the position.
  • the specific arrangement of the contact pairs and the corresponding conductive lines of the conductive film 22 in the first region S1 can be arranged according to needs, and details are not described here.
  • each contact pair corresponds to a pressing component 24, and when the pressing component 24 is pressed, the two contacts of the contact pair can be contacted and conducted, thereby generating a corresponding key signal.
  • the flexible circuit board 23 extends to at least partly correspond to the second area S2.
  • Part of the multiple groups of pressing components 24 is the first pressing component 24a, and part is the second pressing component 24b.
  • the pressing component 24 of the space bar adopts the second pressing component 24b
  • the pressing components 24 of other keys adopt the first pressing component 24a.
  • the first pressing assembly 24a includes a first keycap 28 and a first support structure 29, and the first keycap 28 is compressibly supported on the support plate 21 by the first support structure 29 and corresponds to the contact
  • the points are paired, and the first keycap 28 can be pressed to make the contact pair conductive and generate a key position signal corresponding to the position.
  • corresponding holes are opened on the conductive film 22 .
  • the second pressing assembly 24b is a space bar pressing assembly 24c
  • the space bar pressing assembly 24c includes a second keycap 30 (ie, a space bar keycap), an induced part 32 and a second keycap 30.
  • Two support structures 31 , the second keycap 30 is supported on the support plate 21 by the second support structure 31 , and the sensing element 32 is disposed on the second keycap 30 .
  • the second support structure 31 includes two scissors support structures 33 and elastic support members 34, and the two scissors support structures 33 are respectively supported on the lengthwise ends of the space bar cap, elastically
  • the supporting member 34 is supported at the middle position in the length direction of the space bar cap.
  • the elastic supporting member 34 in this embodiment may be a rubber dome on the known membrane keyboard 10 , which can provide a certain elastic support and facilitate the pressing down and rebounding of the second keycap 30 .
  • the rubber elastic member can be supported on the surface of the conductive film 22 or the support plate 21 .
  • the sensed part 32 is made of conductive silica gel, conductive foam, metal sheet or other conductive structures.
  • the sensed part 32 is in the shape of a sheet or a strip, and the sensed part 32 is glued or clamped to the surface of the second keycap 30 facing the conductive film 22 .
  • the sensed part 32 can also be integrally formed on the second keycap 30 .
  • the two sensed parts 32 of the space bar pressing assembly 24c there are two sensed parts 32 of the space bar pressing assembly 24c, and the two sensed parts 32 are respectively located between the elastic support part 34 and the two scissor brace structures 33 and arranged symmetrically.
  • the flexible circuit board 23 is integrated with a capacitive sensing circuit 35, and the capacitive sensing circuit 35 includes a capacitive sensing structure 36, which corresponds to the second area S2 and is along the edge of the sensed part 32.
  • the pressing direction Y1 (see FIG. 5 ) of the second keycap 30 corresponds, and when the second keycap 30 is pressed, the capacitive sensing circuit 35 can sense the capacitance value change between the capacitive sensing structure 36 and the sensed part 32, and when When the capacitance value reaches the capacitance conduction threshold of the capacitance sensing circuit 35 , a key signal corresponding to the position is generated.
  • the flexible circuit board 23 includes a first board segment 37 and a second board segment 38 , and the first board segment 37 and the second board segment 38 are connected to form an L shape.
  • the first plate segment 37 extends parallel to the length of the space bar and corresponds to the space bar cap, and the first plate segment 37 is provided with capacitive sensing structures 36 respectively corresponding to the two sensed parts 32 .
  • the light source assembly 27 includes a light source circuit 39 integrated in the flexible circuit board 23, the light source circuit 39 includes an LED lamp 40 capable of energizing and emitting light, and the flexible circuit board 23 is located away from the backlight board 26.
  • the second plate segment 38 is connected to one end of the first plate segment 37 and forms an L-shaped flexible circuit board 23 together with the first plate segment 37 .
  • the light source circuit 39 further includes a plurality of resistors 41 , and the LED lamp 40 and the resistors 41 are connected in parallel to the power supply of the light source circuit 39 after being connected in series.
  • the flexible circuit board can be connected to the host through the golden fingers 42, or can be connected through other wiring methods.
  • the light source circuit 39 of the backlight module 25 and the aforementioned capacitive sensing circuit 35 are integrated on the flexible circuit board 23 on the back of the backlight board 26 , which improves the utilization rate of the flexible circuit board 23 .
  • the capacitive sensing circuit 35 used in part of the pressing assembly 24 (second pressing assembly 24b) is integrated
  • the capacitive sensing button function is implemented on the flexible circuit board 23 , and the cost increase of the membrane keyboard 10 is very small.
  • Part of the pressing assembly 24 (second pressing assembly 24b) of the membrane keyboard 10 in the embodiment of the present application is provided with the flexible circuit board 23 and the capacitive sensing circuit 35 on it, and is sensed by the second keycap 30 when the key is pressed.
  • the capacitance value change between the element 32 and the corresponding capacitance sensing structure 36 realizes the non-contact triggering of the key position signal, especially suitable for long keys (such as space keys, etc.) that are prone to poor function in the corner, and can be realized at low cost while holding the key. Under the premise of the stroke and the overall thickness of the keyboard, it solves the problem of poor function of the corners, improves the reliability of the keys, and has a wide application prospect.
  • the elastic support member 34 can provide elastic support, and the touch of the key can be set to be consistent with that of a conventional key.
  • the first plate section 37 corresponding to the space bar is additionally arranged on the surface of the flexible circuit board 23, so that the corner function of the space bar can be better solved, and the increased cost is small.
  • the capacitive sensing structure 36 includes a mountain-shaped first line 43 and a U-shaped second line 44, and the first line 43 and the second line 44 are spaced apart from each other.
  • the first line 43 is electrically connected to the VCC+ interface (power interface) of the system-side capacitance signal processing unit 45
  • the second line 44 is electrically connected to the GND interface (ground interface) of the system-side capacitance signal processing unit 45, so that the first line 43 and the second line 44 form an electric field, and when the sensed part 32 approaches or moves away from the capacitive sensing structure 36 , the electric field will be cut, thereby changing the capacitance between the sensed part 32 and the capacitive sensing structure 36 .
  • the capacitive sensing structure 36 in this implementation mode through the first line 43 of three branches and the second line 44 of two branches, is intersected at intervals to form a plurality of sets of spaced capacitive structures, which can be sensitive according to the sensed part 32
  • the position of the capacitor changes to change the capacitance value, and then can sensitively give the key position signal according to the displacement of the second keycap 30.
  • the capacitive sensing circuit of this structure when connected to the alternating current, it can generate the The combined electric field M1 of the two electric field lines is roughly arched, so that even if there is a certain deviation in the lateral (lengthwise or widthwise) position of the induced element 32, it can still reliably sense the position of the induced element 32 when the key is pressed. displacement.
  • the support plate 21 is a metal plate, and a through hole K3 is opened on the support plate 21 corresponding to the sensed part 32 .
  • the support plate 21 is a metal plate, and only the through hole K3 is opened at the corresponding sensed part 32.
  • the metal plate can shield the displacement of the metal parts that may exist in other positions of the membrane keyboard 10 from interfering with the capacitive sensing structure 36.
  • the opened through hole K3 can prevent the support plate 21 from affecting the sensing of the capacitive sensing structure 36 to the sensed part 32, thereby ensuring that the capacitive sensing structure 36 can accurately sense the displacement of the sensed part 32.
  • no contact pair is provided in the second area S2, and key signals are generated in other ways (details will be described below). Since the second area S2 does not need to set contact pairs to generate key position signals, the design of the avoidance hole K2 on it is not affected by the contact pairs or their circuits, and can be reasonably set according to needs, so as to maximize the button feel of the pressing component 24 . In some other implementations, the second region S2 of the conductive film 22 can be partly or completely cut off as required, so that the corresponding pressing component 24 can be directly connected to the support plate 21 without being blocked by the conductive film 22 .
  • the contact pair and the corresponding circuit can also be reserved in the second area S2. In this way, the key position signal can be obtained through one of the contact pair contact and capacitance value detection, which further improves the reliability of the key.
  • the second pressing component 24b of the key component 20a is used for each key of the membrane keyboard 10 whose length is greater than the width, including the Tab on the left side of the membrane keyboard 10 key 46a, caps lock key 46b, left shift key 46c and left CTRL key 46d, space bar 46e down the membrane keyboard 10, backspace key 46f on the right side of the membrane keyboard 10, enter key 46g, right shift key 46h and right CTRL Key 46i etc.
  • the flexible circuit board 23 includes a fourth board portion 47 , a fifth board portion 48 and a sixth board portion 49 .
  • the fourth board part 47 corresponds to the column where the left shift key 46c of the membrane keyboard 10 is located
  • the fifth board part 48 corresponds to the column where the right shift key 46h of the membrane keyboard 10 is located
  • the sixth board part 49 corresponds to the space bar 46e of the membrane keyboard 10
  • the fourth plate portion 47 , the sixth plate portion 49 , and the fifth plate portion 48 are connected in sequence.
  • the area of the flexible circuit board 23 is reduced. It is small and can better cover the common long keys of the membrane keyboard 10 .

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  • Push-Button Switches (AREA)

Abstract

一种薄膜键盘（10），包括支撑板（21）、导电薄膜（22）、柔性电路板（23）和多组按压组件（24），导电薄膜设有第一区域（S1）和第二区域（S2），导电薄膜在第一区域分布有触点对，触点对能够受压电导通以产生对应位置的键位信号。按压组件分为第一按压组件（24a）和第二按压组件（24b），第二按压组件包括第二键帽（30）、被感应件（32）和第二支撑结构（31），被感应件设置于第二键帽。柔性电路板集成有电容感应电路（35），电容感应电路包括电容感应结构（36），电容感应结构和被感应件对应，且第二键帽被按压时，电容感应电路能够感应电容感应结构和被感应件之间的电容值变化，产生对应位置的键位信号。

Description

薄膜键盘
相关申请的交叉引用
本申请要求在2022年01月17日提交中国专利局、申请号为202210049424.1、申请名称为“薄膜键盘”的中国专利的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及键盘技术领域，具体而言，涉及薄膜键盘。
背景技术
薄膜键盘以其轻薄、低价、低噪声等优势而成为销售较多的键盘，既可配合个人台式电脑使用，也可一体设置于笔记本电脑，作为笔记本电脑的键盘部分。
然而，已知薄膜键盘仍存在按键手感较差或角落功能不良的问题。
发明内容
本申请实施例提供薄膜键盘，以解决已知薄膜键盘存在按键手感较差或角落功能不良的问题。
本申请实施例提供一种薄膜键盘，其包括支撑板、导电薄膜、柔性电路板和多组按压组件。支撑板具有相背的第一表面和第二表面。导电薄膜叠设于支撑板的第一表面一侧；导电薄膜设有第一区域和第二区域，导电薄膜在第一区域分布有触点对，触点对能够受压电导通以产生对应位置的键位信号。柔性电路板设于支撑板的第二表面一侧，并延伸至至少部分对应第二区域。多组按压组件中的部分为第一按压组件、部分为第二按压组件。其中，第一按压组件包括第一键帽和第一支撑结构，第一键帽由第一支撑结构可压缩地支撑于支撑板并对应触点对，且第一键帽能够被按压以使触点对导通，并产生对应位置的键位信号。第二按压组件包括第二键帽、被感应件和第二支撑结构，第二键帽由第二支撑结构支撑于支撑板，被感应件设置于第二键帽。柔性电路板集成有电容感应电路，电容感应电路包括电容感应结构，电容感应结构对应于第二区域并和被感应件在沿第二键帽的按压方向对应，且第二键帽被按压时，电容感应电路能够感应电容感应结构和被感应件之间的电容值变化，且当该电容值达到电容感应电路的电容导通阈值时，产生对应位置的键位信号。
本申请实施例中的薄膜键盘的部分按压组件(第二按压组件)通过设置柔性电路板和其上的电容感应电路，并通过按键时设置于第二键帽的被感应件和对应电容感应结构之间的电容值变化，实现键位信号的非接触式触发，尤其适用于角落功能容易不良的长按键(如空格键等)，能够低成本地实现在保持按键行程和键盘整体厚度的前提下，解决角落功能不良的问题，提高按键可靠性，应用前景广泛。
在一种可能的实现方式中，被感应件由导电硅胶或导电泡棉构成。
该实现方式中，被感应件采用导电硅胶或导电泡棉，其在靠近或远离电容感应结构时，被感应件和电容感应结构之间的电容值逐渐变化，能够被处理得到键位信号。
在一种可能的实现方式中，被感应件呈片状或条状，被感应件粘接或卡接于第二键帽朝向导电薄膜一侧表面。
该实现方式中，片状或条状的感应件通过粘接或卡接的方式连接于第二键帽朝向导电薄膜的一侧，连接方便。
在一种可能的实现方式中，电容感应结构包括山字形的第一线路和U字形的第二线路， 第一线路和第二线路彼此间隔，第一线路电连接至系统端电容信号处理单元的VCC+接口，第二线路电连接至系统端电容信号处理单元的GND接口，以使第一线路和第二线路之间形成电场，被感应件靠近或远离电容感应结构时，将切割电场，从而改变被感应件和电容感应结构之间的电容。
该实现方式中的电容感应结构，通过三个支路的第一线路和两个支路的第二线路间隔交叉设置，形成多组间隔的电容结构，能够灵敏地根据被感应件的位置变化而改变容值，进而能够灵敏地根据第二键帽的位移给出键位信号。
在一种可能的实现方式中，支撑板为金属板，支撑板对应被感应件处开设有通孔。
该实现方式中，支撑板为金属板，且仅在对应被感应件处开设通孔，一方面，金属板能够屏蔽薄膜键盘其他位置可能存在的金属件的位移干扰电容感应结构的感应，另一方面，开设的通孔能够避免支撑板影响电容感应结构对被感应件的感应，从而确保电容感应结构能够准确地感应被感应件的位移。
在一种可能的实现方式中，第二按压组件包括空格键按压组件，空格键按压组件包括空格键帽、两个剪刀撑结构和弹性支撑件，两个剪刀撑结构分别支撑于空格键帽的长向两端，弹性支撑件支撑于空格键帽的长向中间位置，弹性支撑件和两个剪刀撑结构共同构成空格键按压组件的第二支撑结构。空格键按压组件的被感应件共有两个，两个被感应件分别位于弹性支撑件和两个剪刀撑结构之间。柔性电路板包括第一板段，第一板段沿平行于空格键的长向延伸并和空格键帽对应，第一板段上设有与两个被感应件分别对应的电容感应结构。
该实现方式中，空格键作为较长的按键，采用现有技术提高其角落功能的难度较大(如需通过提高空格键帽壁厚、提高支撑板结构刚度等实现)，而实现方式中，通过两侧的剪刀撑和中间的弹性支撑件作为支撑，一定程度上提高了按键手感，加之通过采用在弹性支撑件两侧分别设置被感应件和对应的电容感应结构，无需空格键按压到位使触点对接触，而只需适当设置其电容导通阈值，即可达到所需的按键效果。并且，按键过程中，弹性支撑件可以提供弹性支撑，其按键手感可设置得与常规按键一致。并且，结构上，仅需柔性电路板的板面额外设置对应空格键的第一板段，就能较好地解决空格键角落功能，所增加的成本小。
在一种可能的实现方式中，薄膜键盘包括背光模组，背光模组包括背光板和光源组件。背光板设置于支撑板的第二表面一侧，光源组件包括集成于柔性电路板的光源电路，光源电路包括能够通电发光的LED灯；柔性电路板位于背光板远离支撑板一侧。
该实现方式中，背光模组的光源组件和前述电容感应电路一起集成于在背光板背面的柔性电路板上，提高了柔性电路板的利用效率。或者说，对于原本设有用于集成光源组件的柔性电路板的背光模组来说，将部分按压组件(第二按压组件)采用的电容感应电路集成于该柔性电路板来实现电容感应按键功能，对薄膜键盘的成本增加很小。
在一种可能的实现方式中，柔性电路板包括第二板段，第二板段连接于第一板段的一端，并和第一板段构成L形的柔性电路板。LED灯有多个，多个LED灯沿空格键帽的宽向间隔布设。
该实现方式中，柔性电路板同时集成光源电路和电容感应电路，柔性电路板利用率高。
在一种可能的实现方式中，光源电路还包括多个电阻，LED灯和电阻一一串联后并联于光源电路的供电电源。
该实现方式中，通过电阻和LED板集成于柔性电路板，结构简单且尺寸小，提供光源的成本低。
在一种可能的实现方式中，第二按压组件用于薄膜键盘的长度大于宽度的各按键。
该实现方式中，对于长度较大的按键均采用第二按压组件，采用电容感应的方式进行按键触发，能够低成本解决这些按键角落功能较差、影响手感的问题。
在一种可能的实现方式中，柔性电路板包括第四板部、第五板部和第六板部。第四板部对应于薄膜键盘的左shift键所在列，第五板部对应于薄膜键盘的右shift键所在列，第六板部对应于薄膜键盘的空格键所在行，且第四板部、第六板部、第五板部依次连接。
该实现方式中，通过覆盖左shift键所在列、右shift键所在列及空格键所在行的第四板部、第五板部和第六板部，柔性电路板面积较小，且能够较好地覆盖薄膜键盘的常见长按键。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他相关的附图。
图1为本申请一实施例的薄膜键盘的结构示意图；
图2为图1中的薄膜键盘的按键组件的三维视图；
图3为图2的按键组件的另一视角视图；
图4为图2的按键组件的展开视图；
图5示出了空格键按压组件与导电薄膜、支撑板、柔性电路板、背光模组的配合关系示意图；
图6中示出了导电薄膜的平面视图；
图7中示出了支撑板的平面视图；
图8中示出了柔性电路板上的电容感应电路和光源电路的布设；
图9为图8的A处放大图；
图10为柔性电路板上的电容感应电路和光源电路的原理图；
图11为本申请另一实施例的薄膜键盘的按键组件的三维视图；
图12为图11的背面的平面视图。
主要元件符号说明：
薄膜键盘                  10
壳体                      11
触控板                    12
按键组件                  20,20a
支撑板                    21
导电薄膜                  22
柔性电路板                23
按压组件                  24
第一按压组件              24a
第二按压组件              24b
空格键按压组件            24c
背光模组                  25
背光板                    26
光源组件                  27
第一键帽                  28
第一支撑结构              29
第二键帽                  30
第二支撑结构              31
被感应件                  32
剪刀撑结构                33
弹性支撑件                34
电容感应电路              35
电容感应结构              36
第一板段                  37
第二板段                  38
光源电路                  39
LED灯                     40
电阻                      41
金手指                    42
第一线路                  43
第二线路                  44
系统端电容信号处理单元    45
Tab键                     46a
大写锁定键                46b
左shift键                 46c
左CTRL键                  46d
空格键                    46e
回格键                    46f
回车键                    46g
右shift键                 46h
右CTRL键                  46i
第四板部                  47
第五板部                  48
第六板部                  49
键孔                      K1
避让孔                    K2
通孔                      K3
组合电场                  M1
第一表面                  P1
第二表面                  P2
内部空间                  Q1
第一区域                  S1
第二区域                  S2
按压方向                  Y1
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。
需要说明的是，当元件被称为“固定于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。当一个元件被认为是“设置于”另一个元件，它可以是直接设 置在另一个元件上或者可能同时存在居中元件。本文所使用的术语“垂直的”、“水平的”、“左”、“右”以及类似的表述只是为了说明的目的。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施方式的目的，不是旨在于限制本申请。本文所使用的术语“或/及”包括一个或多个相关的所列项目的任意的和所有的组合。
本申请的一些实施方式作详细说明。在不冲突的情况下，下述的实施方式及实施方式中的特征可以相互组合。
实施例
本实施例提供了一种薄膜键盘10，其可以是独立使用的键盘或附设在笔记本电脑等整机上的键盘。
参见图1，本实施例中的薄膜键盘10包括壳体11和安装于壳体11的按键组件20。使用者能够通过按压按键组件20的按键进行信息输入。按键组件20的按键的数量和布设方式可以根据常用键盘的79键、83键、87键、93键、96键、101键、102键、104键、107键等形式布设。本实施例中薄膜键盘10的按键包括若干长宽基本相等的普通按键和若干长度长于宽度的长按键。典型的长按键主要有空格键。
在一些实施方式中，本实施例中的薄膜键盘10还包括触控板12，用于替代普通鼠标。触控板12为现有结构，在此不赘述。在其他实施方中，也可不设置触控板12。
本实施例中，壳体11围成内部空间Q1，且壳体11开设有对应按键数量的键孔K1，各键孔K1分别连通壳体11的内部空间Q1，用于露出按键组件20。
参见图2-图4，本申请实施例提供的按键组件20包括支撑板21、导电薄膜22、柔性电路板23和多组按压组件24。一些实施方式中，按键组件20还设置有背光模组25，背光模组25包括背光板26和光源组件27。
配合参见图4和图5，支撑板21具有相背的第一表面P1和第二表面P2，导电薄膜22叠设于支撑板21的第一表面P1一侧，柔性电路板23设于支撑板21的第二表面P2一侧。各组按压组件24布设于支撑板21的第一表面P1一侧。
对于设置背光模组25的实施方式，背光板26可设置在支撑板21和柔性电路板23之间，光源组件27集成在柔性电路板23上。光源组件27提供的光源经背光板26后提供背光。通过将背光模组25的光源组件27集成在柔性电路板23上，能够以较小的结构设计实现背光效果，结构布置合理且成本较低，有利于市场推广。
本实施例中，可选地，背光板26、支撑板21、导电薄膜22三者大致呈长方形的板状结构，三者从下到上依次叠合并连接于壳体11的内部空间Q1的底面，各组按压组件24分别连接在支撑板21或导电薄膜22上，且分别从壳体11上对应的键孔K1露出，便于使用者按键操作。
本实施例中，柔性电路板23只需覆盖部分位置(后文具体介绍)即可，其板面尺寸可设置得远小于背光板26/支撑板21/导电薄膜22的板面尺寸，从而具有较小结构成本。此外，为在厚度上容置柔性电路板23，可在壳体11或背光板26对应柔性电路板23的位置内凹形成用于容置柔性电路板23的凹槽(图中未示出)，从而避免柔性电路板23增加薄膜键盘10的整体厚度。因柔性电路板23的板面尺寸可设置得较小，因此，设置该凹槽对薄膜键盘10的整体结构性能影响较小。
配合参见图5和图6，一些实施方式中，需要在导电薄膜22上开设避让孔K2，以允许按压组件24通过并连接在支撑板21上。限于导电薄膜22板面空间有限，避让孔K2的设置容易影响其上导电电路的布设。并且，避让孔K2的位置需要具有较高的准确度，以避免组装时按压组件24和导电薄膜22干涉而影响与支撑板21之间的连接。尤其对于空格键等长按键(指键帽长度大于宽度的按键)，为提高角落功能，需要设置较多或较复杂的支撑结构，使得导电薄膜22上开设避让孔K2也相应较多，进一步增大了导电薄膜22形状和电路设计的难度以及提高装配难度。
本实施例中，导电薄膜22设有第一区域S1和第二区域S2，导电薄膜22在第一区域S1分布有多个触点对(图中未示出)，对应第一区域S1内的多个按压组件24。触点对能够受压电导通以产生对应位置的键位信号。导电薄膜22在第一区域S1内触点对的具体设置及对应导电线路可根据需要设置，在此不赘述。一般情况下，每个触点对分别对应一个按压组件24，按压组件24按下时，能够使触点对的两触点接触导通，从而产生对应的键位信号。本实施例中，柔性电路板23延伸至至少部分对应第二区域S2。
多组按压组件24中的部分为第一按压组件24a、部分为第二按压组件24b。本实施例的一种实施方式中，空格键的按压组件24采用第二按压组件24b，其他按键的按压组件24采用第一按压组件24a。
再次参见图4，本实施例中，第一按压组件24a包括第一键帽28和第一支撑结构29，第一键帽28由第一支撑结构29可压缩地支撑于支撑板21并对应触点对，且第一键帽28能够被按压以使触点对导通，并产生对应位置的键位信号。为避让第一支撑结构29，导电薄膜22上开设对应的孔。
配合参见图4和图5，本实施方式中，第二按压组件24b为空格键按压组件24c，空格键按压组件24c包括第二键帽30(即空格键键帽)、被感应件32和第二支撑结构31，第二键帽30由第二支撑结构31支撑于支撑板21，被感应件32设置于第二键帽30。其中，为提高第二按压组件24b的按键手感，第二支撑结构31包括两个剪刀撑结构33和弹性支撑件34，两个剪刀撑结构33分别支撑于空格键帽的长向两端，弹性支撑件34支撑于空格键帽的长向中间位置。本实施例中的弹性支撑件34可以是已知薄膜键盘10上的橡胶弹性件(rubber dome)，其能提供一定的弹性支撑，利于第二键帽30的下压和回弹。橡胶弹性件可以支撑于导电薄膜22或支撑板21的表面。
本实施例中，被感应件32由导电硅胶、导电泡棉、金属片或其他导电结构构成。可选地，被感应件32呈片状或条状，被感应件32粘接或卡接于第二键帽30朝向导电薄膜22一侧表面。在一些实施方式中，被感应件32还可以一体成型于第二键帽30。
本实施例中，空格键按压组件24c的被感应件32共有两个，两个被感应件32分别位于弹性支撑件34和两个剪刀撑结构33之间，并对称设置。
配合参见图8、图9和图10，柔性电路板23集成有电容感应电路35，电容感应电路35包括电容感应结构36，电容感应结构36对应于第二区域S2并和被感应件32在沿第二键帽30的按压方向Y1(参见图5)对应，且第二键帽30被按压时，电容感应电路35能够感应电容感应结构36和被感应件32之间的电容值变化，且当该电容值达到电容感应电路35的电容导通阈值时，产生对应位置的键位信号。
本实施例中，柔性电路板23包括第一板段37和第二板段38，第一板段37和第二板段38连接形成L形。
其中，第一板段37沿平行于空格键的长向延伸并和空格键帽对应，第一板段37上设有与两个被感应件32分别对应的电容感应结构36。对于设置如前述的背光模组25的薄膜键盘10，光源组件27包括集成于柔性电路板23的光源电路39，光源电路39包括能够通电发光的LED灯40，柔性电路板23位于背光板26远离支撑板21一侧。第二板段38连接于第一板段37的一端，并和第一板段37构成L形的柔性电路板23。LED灯40有多个，多个LED灯40沿空格键帽的宽向间隔布设。可选地，光源电路39还包括多个电阻41，LED灯40和电阻41一一串联后并联于光源电路39的供电电源。柔性电路板可以通过金手指42连接至主机，也可通过其他连线的方式实现连接。
该实施方式中，背光模组25的光源电路39和前述电容感应电路35一起集成于在背光板26背面的柔性电路板23上，提高了柔性电路板23的利用率。或者说，对于申请人部分技术采用的原本设有用于集成光源组件27的柔性电路板23的背光模组25来说，将部分按压组件24(第二按压组件24b)采用的电容感应电路35集成于该柔性电路板23来实现电容感应按键功能，对薄膜键盘10的成本增加很小。
本申请实施例中的薄膜键盘10的部分按压组件24(第二按压组件24b)通过设置柔性电路板23和其上的电容感应电路35，并通过按键时设置于第二键帽30的被感应件32和对应电容感应结构36之间的电容值变化，实现键位信号的非接触式触发，尤其适用于角落功能容易不良的长按键(如空格键等)，能够低成本地实现在保持按键行程和键盘整体厚度的前提下，解决角落功能不良的问题，提高按键可靠性，应用前景广泛。尤其对于空格键等长按键，采用现有技术提高其角落功能的难度较大(如需通过提高空格键帽壁厚、提高支撑板21的结构刚度等实现)，而本实施方式中，通过两侧的剪刀撑结构33和中间的弹性支撑件34作为支撑，一定程度上提高了按键手感，加之通过采用在弹性支撑件34两侧分别设置被感应件32和对应的电容感应结构36，无需空格键按压到位使触点对接触，而只需适当设置其电容导通阈值，即可达到所需的按键效果。并且，按键过程中，弹性支撑件34可以提供弹性支撑，其按键手感可设置得与常规按键一致。同时，结构上，仅需柔性电路板23的板面额外设置对应空格键的第一板段37，就能较好地解决空格键角落功能，所增加的成本小。
再次参见图9和图10，在一种可选的实施方式中，电容感应结构36包括山字形的第一线路43和U字形的第二线路44，第一线路43和第二线路44彼此间隔，第一线路43电连接至系统端电容信号处理单元45的VCC+接口(电源接口)，第二线路44电连接至系统端电容信号处理单元45的GND接口(接地接口)，以使第一线路43和第二线路44之间形成电场，被感应件32靠近或远离电容感应结构36时，将切割电场，从而改变被感应件32和电容感应结构36之间的电容。该实现方式中的电容感应结构36，通过三个支路的第一线路43和两个支路的第二线路44间隔交叉设置，形成多组间隔的电容结构，能够灵敏地根据被感应件32的位置变化而改变容值，进而能够灵敏地根据第二键帽30的位移给出键位信号，同时，该结构的电容感应线路其在接入交流电时，能够产生如图5中示出的两个电场线大致呈拱形的组合电场M1，使得被感应件32即使侧向(空格键的长向或宽向)设置位置存在一定偏差时，仍能可靠地感应按键时被感应件32的位移。
参见图4、图5或图7，在一种可能的实现方式中，支撑板21为金属板，支撑板21对应被感应件32处开设有通孔K3。该实现方式中，支撑板21为金属板，且仅在对应被感应件32处开设通孔K3，一方面，金属板能够屏蔽薄膜键盘10其他位置可能存在的金属件的位移干扰电容感应结构36的感应，另一方面，开设的通孔K3能够避免支撑板21影响电容感应 结构36对被感应件32的感应，从而确保电容感应结构36能够准确地感应被感应件32的位移。
在一些实施方式中，第二区域S2内不设置触点对，而采用其他方式产生键位信号(具体将在下文具体介绍)。由于第二区域S2无需设置触点对来产生键位信号，其上的避让孔K2设计不受触点对或其电路的影响，可以根据需要合理设置，以最大限度提高按压组件24的按键手感。在另一些实现方式中，导电薄膜22的第二区域S2可以根据需要部分或全部切除，如此，可方便对应的按压组件24直接连接于支撑板21，而不受导电薄膜22的阻挡。
第二区域S2内也可以保留触点对和对应电路，如此，通过触点对接触和电容容值检测两者之一即可得到键位信号，进一步提高了按键的可靠性。
配合参见图11和图12，在本实施例的另一种实施方式中，按键组件20a的第二按压组件24b用于薄膜键盘10的长度大于宽度的各按键，包括薄膜键盘10左侧的Tab键46a、大写锁定键46b、左shift键46c和左CTRL键46d、薄膜键盘10下行的空格键46e、薄膜键盘10右侧的回格键46f、回车键46g、右shift键46h和右CTRL键46i等。对于该实施方式，柔性电路板23包括第四板部47、第五板部48和第六板部49。第四板部47对应于薄膜键盘10的左shift键46c所在列，第五板部48对应于薄膜键盘10的右shift键46h所在列，第六板部49对应于薄膜键盘10的空格键46e所在行，且第四板部47、第六板部49、第五板部48依次连接。该实现方式中，通过覆盖左shift键46c所在列、右shift键46h所在列及空格键46e所在行的第四板部47、第五板部48和第六板部49，柔性电路板23面积较小，且能够较好地覆盖薄膜键盘10的常见长按键。
以上实施方式仅用以说明本申请的技术方案而非限制，尽管参照以上较佳实施方式对本申请进行了详细说明，本领域的普通技术人员应当理解，可以对本申请的技术方案进行修改或等同替换都不应脱离本申请技术方案的精神和范围。

Claims (11)

  1. 一种薄膜键盘，其特征在于，包括：
    支撑板，所述支撑板具有相背的第一表面和第二表面；
    导电薄膜，所述导电薄膜叠设于所述支撑板的第一表面一侧；所述导电薄膜设有第一区域和第二区域，所述导电薄膜在所述第一区域分布有触点对，所述触点对能够受压电导通以产生对应位置的键位信号；
    柔性电路板，所述柔性电路板设于所述支撑板的第二表面一侧，并延伸至至少部分对应所述第二区域；
    多组按压组件，多组所述按压组件中的部分为第一按压组件、部分为第二按压组件；
    其中，所述第一按压组件包括第一键帽和第一支撑结构，所述第一键帽由所述第一支撑结构可压缩地支撑于所述支撑板并对应所述触点对，且所述第一键帽能够被按压以使所述触点对导通，并产生对应位置的键位信号；
    所述第二按压组件包括第二键帽、被感应件和第二支撑结构，所述第二键帽由所述第二支撑结构支撑于所述支撑板，所述被感应件设置于所述第二键帽；
    所述柔性电路板集成有电容感应电路，所述电容感应电路包括电容感应结构，所述电容感应结构对应于所述第二区域并和所述被感应件在沿所述第二键帽的按压方向对应，且所述第二键帽被按压时，所述电容感应电路能够感应所述电容感应结构和所述被感应件之间的电容值变化，且当该电容值达到所述电容感应电路的电容导通阈值时，产生对应位置的键位信号。
  2. 根据权利要求1所述的薄膜键盘，其特征在于：
    所述被感应件由导电硅胶或导电泡棉构成。
  3. 根据权利要求1所述的薄膜键盘，其特征在于：
    所述被感应件呈片状或条状，所述被感应件粘接或卡接于所述第二键帽朝向所述导电薄膜一侧表面。
  4. 根据权利要求1所述的薄膜键盘，其特征在于：
    所述电容感应结构包括山字形的第一线路和U字形的第二线路，所述第一线路和所述第二线路彼此间隔，所述第一线路电连接至系统端电容信号处理单元的VCC+接口，所述第二线路电连接至所述系统端电容信号处理单元的GND接口，以使所述第一线路和所述第二线路之间形成电场，所述被感应件靠近或远离所述电容感应结构时，将切割所述电场，从而改变所述被感应件和所述电容感应结构之间的电容。
  5. 根据权利要求1-4任一项所述的薄膜键盘，其特征在于：
    所述支撑板为金属板，所述支撑板对应所述被感应件处开设有通孔。
  6. 根据权利要求1-5任一项所述的薄膜键盘，其特征在于：
    所述第二按压组件包括空格键按压组件，所述空格键按压组件包括空格键帽、两个剪刀撑结构和弹性支撑件，两个所述剪刀撑结构分别支撑于所述空格键帽的长向两端，所述弹性支撑件支撑于所述空格键帽的长向中间位置，所述弹性支撑件和两个所述剪刀撑结构共同构成所述空格键按压组件的第二支撑结构；
    所述空格键按压组件的被感应件共有两个，两个所述被感应件分别位于所述弹性支撑件和两个剪刀撑结构之间；
    所述柔性电路板包括第一板段，所述第一板段沿平行于所述空格键的长向延伸并和所述空格键帽对应，所述第一板段上设有与两个所述被感应件分别对应的电容感应结构。
  7. 根据权利要求6所述的薄膜键盘，其特征在于：
    所述薄膜键盘包括背光模组，所述背光模组包括背光板和光源组件；
    所述背光板设置于所述支撑板的第二表面一侧，所述光源组件包括集成于所述柔性电路板的光源电路，所述光源电路包括能够通电发光的LED灯；所述柔性电路板位于所述背光板远离所述支撑板一侧。
  8. 根据权利要求7所述的薄膜键盘，其特征在于：
    所述柔性电路板包括第二板段，所述第二板段连接于所述第一板段的一端，并和所述第一板段构成L形的所述柔性电路板；
    所述LED灯有多个，多个所述LED灯沿所述空格键帽的宽向间隔布设。
  9. 根据权利要求8所述的薄膜键盘，其特征在于：
    所述光源电路还包括多个电阻，所述LED灯和所述电阻一一串联后并联于所述光源电路的供电电源。
  10. 根据权利要求1所述的薄膜键盘，其特征在于：
    所述第二按压组件用于所述薄膜键盘的长度大于宽度的各按键。
  11. 根据权利要求10所述的薄膜键盘，其特征在于：
    所述柔性电路板包括第四板部、第五板部和第六板部；
    所述第四板部对应于薄膜键盘的左shift键所在列，所述第五板部对应于薄膜键盘的右shift键所在列，所述第六板部对应于薄膜键盘的空格键所在行，且所述第四板部、所述第六板部、所述第五板部依次连接。
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