CN211089631U - Capacitive key structure and keyboard - Google Patents

Abstract

The utility model discloses a capacitance type key structure and a keyboard, which comprises a static electrode arranged on a PCB board, wherein the PCB board is provided with a wiring electrically connected with the static electrode; the guide reset assembly is arranged on the PCB; the movable electrode is arranged on the guide resetting component and is positioned above the static electrode, the movable electrode can be close to or far away from the static electrode under the action of the guide resetting component, and the minimum distance between the movable electrode and the static electrode is larger than zero; and the keycap is connected with the guide resetting component. Static electrode and moving electrode constitute the condenser, and when using, the electrostatic capacitance of condenser can change, and the static electrode is through walking the change signal that line outside sent electrostatic capacitance to judge the button and pressed, in the use, the minimum interval between moving electrode and the static electrode is greater than zero, can avoid moving electrode and static electrode to take place the strain, is favorable to prolonging the life of product.

Description

Capacitive key structure and keyboard

Technical Field

The utility model relates to a keyboard technical field, in particular to capacitanc button structure and keyboard.

Background

The current commonly used keyboards comprise a mechanical keyboard and a membrane keyboard, and no matter the mechanical keyboard or the membrane keyboard is used, the triggering mode of the mechanical keyboard or the membrane keyboard is that a conducting circuit is formed by the contact of two electrodes to trigger a signal, the triggering mode can cause electrode strain, so that the triggering of keys is insensitive, and the service life is shortened.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a capacitanc button structure can realize the non-contact response, prolongs the life of button.

The utility model discloses still provide a keyboard that has above-mentioned capacitanc button structure.

According to the present invention, the capacitive button structure of the first aspect embodiment comprises a static electrode disposed on a PCB board, wherein the PCB board is provided with a trace electrically connected to the static electrode; the guide reset assembly is arranged on the PCB and covers the static electrode; the movable electrode is arranged on the guide resetting component and is positioned above the static electrode, the movable electrode can be close to or far away from the static electrode under the action of the guide resetting component, and the minimum distance between the movable electrode and the static electrode is larger than zero; and the keycap is connected with the guide resetting component.

According to the utility model discloses capacitanc button structure has following beneficial effect at least:

static electrode and moving electrode constitute the condenser, when using, after the key cap is pressed, the moving electrode is close to the static electrode under the effect of direction reset assembly, the electrostatic capacity of condenser changes, the static electrode is through walking the change signal that line outside sent electrostatic capacity to judge the button and pressed, in the use, the minimum interval between moving electrode and the static electrode is greater than zero, can avoid moving electrode and static electrode to take place the strain, be favorable to prolonging the life of product.

According to some embodiments of the utility model, the direction reset assembly includes guide body, guiding axle and reset member, be provided with the cavity in the guide body, the opening orientation of cavity the static electrode, the guiding axle activity is worn to locate the guide body, just the first end of guiding axle is located in the cavity, the dynamic electrode sets up the first end of guiding axle, the second end of guiding axle with the key cap is connected, reset member cover is established outside the guide body, and with the key cap butt.

According to some embodiments of the utility model, the direction reset subassembly includes guide body, guiding axle and reset member, be provided with the cavity in the guide body, the opening orientation of cavity the static electrode, the guiding axle activity is worn to locate the guide body, just the first end of guiding axle is located in the cavity, the dynamic electrode sets up the first end of guiding axle, the second end of guiding axle with the key cap is connected, reset member sets up in the cavity, just reset member's one end with PCB board butt, reset member's the other end with the guiding axle butt.

According to some embodiments of the invention, the return member is a spring or a resilient rubber bowl.

According to some embodiments of the present invention, the elastic rubber bowl is a silica rubber bowl or a rubber bowl.

According to the utility model discloses a capacitanc keyboard of second aspect embodiment, including signal acquisition module and at least one button, the button adopts foretell capacitanc button structure, signal acquisition module passes through walk the line with static electrode electric connection.

According to the utility model discloses capacitanc keyboard has following beneficial effect at least:

static electrode and moving electrode constitute the condenser, when using, the key cap is pressed the back, the moving electrode is close to the static electrode under the effect of direction reset assembly, the electrostatic capacity of condenser changes, the static electrode sends the change signal of electrostatic capacity to signal acquisition module through walking the line, thereby judge the button and pressed, in the use, the minimum interval between moving electrode and the static electrode is greater than zero, can avoid moving electrode and static electrode to take place the strain, be favorable to prolonging the life of product.

According to some embodiments of the utility model, the signal acquisition module includes first signal acquisition chip, first signal acquisition chip with the static electrode electric connection of button.

According to the utility model discloses a some embodiments, the signal acquisition module still includes the second signal acquisition chip, the second signal acquisition chip is connected with at least two first signal acquisition chip.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic longitudinal sectional view of a capacitive button structure according to an embodiment of the present invention;

fig. 2 is a schematic longitudinal sectional view of a capacitive button structure according to an embodiment of the present invention;

fig. 3 is a schematic block diagram of a capacitive keypad according to an embodiment of the present invention;

FIG. 4 is a functional block diagram of a signal acquisition module of the capacitive keypad shown in FIG. 3;

FIG. 5 is a schematic circuit diagram of a first signal acquisition chip in the signal acquisition module shown in FIG. 4;

fig. 6 is a schematic circuit diagram of a second signal acquisition chip in the signal acquisition module shown in fig. 4.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1, a first embodiment of the present invention discloses a capacitive button structure, including a static electrode 110, a guiding reset component 200, a dynamic electrode 300 and a key cap 400, wherein the static electrode 110 is disposed on a PCB 100, the PCB 100 is disposed with a trace electrically connected to the static electrode 110, and the trace is a conductive trace on a circuit board. The guiding-resetting assembly 200 is disposed on the PCB 100 and covers the static electrode 110, and it should be noted that the guiding-resetting assembly 200 can be directly or indirectly connected to the PCB 100. The movable electrode 300 is disposed on the guiding reset component 200 and above the static electrode 110, the movable electrode 300 can be close to or far away from the static electrode 110 under the action of the guiding reset component 200, the minimum distance between the movable electrode 300 and the static electrode 110 is greater than zero, and the keycap 400 is connected with the guiding reset component 200. It is contemplated that key cap 400 is disposed over guide reset assembly 200 and that the surface of key cap 400 may be provided with an identifier such as a letter, number, symbol, text or design, etc.

When the key cap 400 is loosened, the guide resetting component 200 drives the key cap 400 and the movable electrode 300 to reset. In the use process, the minimum distance between the movable electrode 300 and the static electrode 110 is greater than zero, so that the movable electrode 300 can be prevented from being in direct contact with the static electrode 110, strain of the movable electrode 300 and the static electrode 110 is avoided, and the service life of a product is prolonged.

Referring to fig. 1, the guiding-resetting assembly 200 includes a guiding body 210, a guiding shaft 220 and a resetting member 230, wherein a cavity 211 is disposed in the guiding body 210, the cavity 211 opens toward the static electrode 110, the guiding shaft 220 movably penetrates through the guiding body 210, it is contemplated that a through hole is disposed on the guiding body 210 so that the guiding shaft 220 penetrates through the guiding body 210, a first end of the guiding shaft 220 is located in the cavity 211, a movable electrode 300 is disposed at a first end of the guiding shaft 220, and specifically, the movable electrode 300 may be adhered or clamped on the guiding shaft 220. It should be noted that, in order to limit the maximum reset stroke of the guide shaft 220 to prevent the guide shaft 220 from being separated from the guide body 210 during reset, the diameter or the side length of the first end of the guide shaft 220 is larger than the diameter of the through hole on the guide body 210. The second end of guide shaft 220 is connected with key cap 400, and specifically, the bottom of key cap 400 is provided with cross fixture block 410, is provided with draw-in groove 221 with the fixture block adaptation on the guide shaft 220, and key cap 400 and guide shaft 220 pass through the cooperation of fixture block 410 and draw-in groove 221 and are mutually detachable to be connected. The guide shaft 220 can move up and down to enable the movable electrode 300 to be far away from or close to the static electrode 110, and due to the fact that the length of the guide shaft 220 is fixed, when the keycap 400 is pressed down, the guide body 210 can limit the maximum stroke of the keycap 400, and therefore the minimum distance between the movable electrode 300 and the static electrode 110 is larger than zero. When the movable electrode 300 approaches the stationary electrode 110, a small amount of air is squeezed, and the squeezed air may be discharged through the assembly gap of the guide body 210 or through the vent hole provided in the guide body 210.

Referring to fig. 1, in some embodiments, the reset member 230 is disposed outside the guide body 210 and abuts against the key cap 400. The reset member 230 has elasticity, when the key cap 400 is pressed down, the reset member 230 compresses and stores energy, when the key cap 400 is released, the reset member 230 releases energy and pushes the key cap 400 to reset, thereby driving the movable electrode 300 to reset.

Referring to fig. 2, in other embodiments, restoring member 230 is disposed in cavity 211, and one end of restoring member 230 abuts against PCB board 100, and the other end of restoring member 230 abuts against the first end of guide shaft 220. In order to prevent the capacitor formed by the movable electrode 300 and the stationary electrode 110 from being damaged, an insulating member is used as the reset member 230, or an insulating process is performed between the PCB 100 and the reset member 230.

In some embodiments, the return member 230 employs a spring or resilient glue bowl. It should be noted that the elastic rubber bowl is a thin-walled structure made of thermoplastic material and has certain elasticity. The spring has stronger elasticity and quicker resetting speed, and is suitable for keys with higher sensitivity requirements. Compared with a spring, the elastic rubber bowl is small in force required by compression, and for keys with long service time, such as keys of an office keyboard, the elastic rubber bowl can reduce the operating pressure of fingers, so that the experience of a user is improved. Specifically, the elastic rubber bowl is a silica gel bowl or a rubber bowl.

Referring to fig. 3, a second aspect of the present invention discloses a capacitive keyboard, including a signal collection module 120 and at least one key, where the key adopts the above-mentioned capacitive key structure, the signal collection module 120 is electrically connected to the static electrode 110 of the key through a wire, and the signal collection module 120 is used for collecting a static capacitance signal of the static electrode 110.

The static electrode 110 and the moving electrode 300 form a capacitor, when the capacitive keyboard is powered on, the static capacitance of the static electrode 110 and the moving electrode 300 is initialized, and the signal acquisition module 120 continuously detects the capacitance of the static electrode 110. When using, after key cap 400 is pressed, moving electrode 300 is close to static electrode 110 under the effect of direction reset assembly 200, the electrostatic capacity of condenser changes, static electrode 110 sends the change signal of electrostatic capacity to signal acquisition module 120 through the wire, thereby judge that the button is pressed, in the use, the minimum interval between moving electrode 300 and the static electrode 110 is greater than zero, can avoid moving electrode 300 and static electrode 110 direct contact, thereby avoid moving electrode 300 and static electrode 110 to take place the strain, be favorable to prolonging the life of product.

Referring to fig. 4, the capacitive keyboard according to the embodiment of the present invention is suitable for different products, such as a computer keyboard, a password input keyboard, or a keyboard of an electronic calculator. According to different product types, the number of keys of the capacitive keypad can be adaptively adjusted, and when the number of keys is small, the signal acquisition module 120 includes a first signal acquisition chip 121, and the first signal acquisition chip 121 is electrically connected to the static electrodes 110 of the keys.

Referring to fig. 5, fig. 5 is a schematic circuit diagram of the signal acquisition module 120 according to one embodiment of the capacitive keypad. The signal acquisition module 120 includes a signal acquisition chip U1 and its peripheral circuit, and the signal acquisition chip U1 adopts a low-power COMS microcontroller, has 32 GPIO (general purpose input output) interfaces, can external up to 32 buttons, satisfies the keying connection demand of most keyboards, and it should be noted that the signal acquisition chip U1 is the utility model discloses a preferred embodiment of the first signal acquisition chip 121 of embodiment, and not specifically prescribe a limit to first signal acquisition chip 121. When the key is pressed, the signal acquisition chip U1 can determine that the key is triggered by detecting the change of the electrostatic capacitance of the key, and confirm the characters such as the number, letter or symbol corresponding to the key by looking up the table, and send the output signal corresponding to the characters to the outside. Specifically, the 37 th pin of the signal acquisition chip U1 is one of GPIO interfaces, and the pin is electrically connected to the static electrode 110 of one of the keys through a trace, it should be noted that the trace may further be provided with a resistor R1, and the sensitivity of the change in the electrostatic capacitance of the static electrode 110 may be adjusted by adjusting the resistance of the resistor R1. When the signal acquisition chip U1 detects and determines that the key corresponding to the static electrode 110 is triggered, the signal acquisition chip U1 searches for a character corresponding to the static electrode 110, for example, a number "1", a letter "M", a symbol "+" or the like, and the signal acquisition chip U1 externally transmits an output signal corresponding to the character through the 38 th pin and the 39 th pin.

Referring to fig. 4, in other embodiments, such as a conventional computer keyboard, when the number of keys is large, the signal acquisition module 120 further includes a second signal acquisition chip 122, and the second signal acquisition chip 122 is connected to at least two first signal acquisition chips 121. The first signal acquisition chips 121 are respectively connected with a plurality of keys, after the keys are pressed down, the first signal acquisition chips 121 corresponding to the keys detect and judge the electrostatic capacitance of the keys and send signals triggered by the keys to the second signal acquisition chips 122, and the second signal acquisition chips 122 are used for coordinating the first signal acquisition chips 121 and outputting the signals from the first signal acquisition chips 121.

Referring to fig. 6, fig. 6 is a schematic circuit diagram of the second signal collecting chip 122 of one embodiment of the capacitive keypad. The embodiment of the utility model provides a signal acquisition module 120 includes signal acquisition chip U4 and peripheral circuit thereof, signal acquisition chip U4 is connected with the same first signal acquisition chip 121 of four, wherein the schematic circuit of first signal acquisition chip 121 please refer to fig. 5, signal acquisition chip U4's 31 th pin and 32 th pin are connected with signal acquisition chip U1's 39 th pin and 38 th pin, the same reason, signal acquisition chip U4's 29 th pin and 30 th pin, 27 th pin and 28 th pin and 25 th pin and 26 th pin are connected with remaining three first signal acquisition chips 121 respectively. The 20 th pin and the 21 st pin of the signal acquisition chip U4 are connected to an external communication interface P1, and the external communication interface P1 may specifically be a USB interface.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (8)

1. A capacitive button structure, comprising:

the static electrode (110) is arranged on a PCB (100), and a routing wire electrically connected with the static electrode (110) is arranged on the PCB (100);

a guide reset assembly (200) disposed on the PCB board (100);

a movable electrode (300) disposed on the guided reset component (200) and above the stationary electrode (110), wherein the movable electrode (300) can move close to or away from the stationary electrode (110) under the action of the guided reset component (200), and the minimum distance between the movable electrode (300) and the stationary electrode (110) is greater than zero;

a key cap (400) connected with the guide resetting component (200).

2. The capacitive button structure of claim 1, wherein the guiding and resetting assembly (200) comprises a guiding body (210), a guiding shaft (220), and a resetting member (230), wherein a cavity (211) is formed in the guiding body (210), the cavity (211) is open to the static electrode (110), the guiding shaft (220) is movably disposed through the guiding body (210), a first end of the guiding shaft (220) is located in the cavity (211), the dynamic electrode (300) is disposed at a first end of the guiding shaft (220), a second end of the guiding shaft (220) is connected to the key cap (400), and the resetting member (230) is disposed outside the guiding body (210) and abuts against the key cap (400).

3. A capacitive button structure according to claim 1, wherein the guided reset assembly (200) comprises a guide body (210), a guide shaft (220) and a reset member (230), a concave cavity (211) is arranged in the guide body (210), the opening of the concave cavity (211) faces the static electrode (110), the guide shaft (220) is movably arranged in the guide body (210), and the first end of the guide shaft (220) is positioned in the cavity (211), the moving electrode (300) is arranged at the first end of the guide shaft (220), the second end of the guide shaft (220) is connected with the key cap (400), the resetting member (230) is arranged in the cavity (211), and one end of the reset component (230) is abutted with the PCB (100), the other end of the return member (230) abuts against the guide shaft (220).

4. A capacitive button arrangement according to claim 2 or 3, wherein the return means (230) is a spring or a resilient rubber bowl.

5. The capacitive button structure of claim 4, wherein the elastic rubber bowl is a silicone bowl or a rubber bowl.

6. A capacitive keyboard, comprising a signal acquisition module (120) and at least one key, wherein the key adopts the capacitive key structure of any one of claims 1 to 5, and the signal acquisition module (120) is electrically connected to the static electrode (110) through the trace.

7. The capacitive keyboard according to claim 6, wherein the signal acquisition module (120) comprises a first signal acquisition chip (121), and the first signal acquisition chip (121) is electrically connected to the static electrodes (110) of the keys.

8. The capacitive keypad according to claim 7, wherein the signal acquisition module (120) further comprises a second signal acquisition chip (122), and at least two first signal acquisition chips (121) are connected to the second signal acquisition chip (122).

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