Triggering structure for keyboard and capacitive touch keyboard

Abstract

The utility model relates to the technical field of keyboards, and discloses a trigger structure for a keyboard and a capacitive touch keyboard, the trigger structure comprises a circuit board, the circuit board is provided with a conductor, and the conductor is conducted with a circuit on the circuit board; the insulation protection plate covers the circuit board; the conductive layer covers the insulating protection plate, and an inductive capacitor is formed between the conductive layer and the conductor; the elastic piece is arranged between the conductive layer and the insulating protection plate; the conductive layer is provided with a pressing part which can be pressed by an operator above the elastic piece; when the pressing part is pressed, the distance between the conductive layer and the conductor is changed, the induction capacitance is changed, and the elastic piece is extruded. The trigger structure has the advantages that the trigger structure is good in waterproof and dustproof effects; no matter an operator uses fingers to press, wears gloves to press, or presses through a non-metal device or through metal, the effect is the same, the consistency is good, and the operation hand feeling is good.

Description

Technical Field

[0001] The utility model relates to the technical field of keyboards, and in particular to a trigger structure for keyboards and a capacitive touch keyboard. Background Art

[0002] The production environment in coal mines is harsh, filled with coal dust, water, gas, etc. The requirements for fully mechanized mining automation require a large number of electronic devices. These devices must have high dust and water resistance, and must remain stable and reliable during frequent operations. The keyboard is one of the indispensable devices.

[0003] In a capacitive touch sensing keyboard, the capacitive touch chip detects the capacitance change of the target area and converts it into a digital signal to identify the touch of a human finger. Among them, the touch sensing electrode is composed of a metal pattern on the PCB. When there is no finger approaching, the capacitance on the sensing electrode is composed of the parasitic capacitance between the electrode and the surrounding ground wire or other signal leads. When a finger touches the panel above the electrode, due to the conductivity of the human body, the electric field above the sensing electrode plate is enhanced, forming a capacitor in parallel with the parasitic capacitance, thereby increasing the total capacitance on the sensing electrode. The capacitive touch sensing detection circuit detects this change in capacitance to determine whether there is a finger touch. The current mainstream solution is to use a pot piece (i.e., a metal dome) to connect the circuit to obtain key information; the other is to use a touch key method.

[0004] In the method of using metal dome, there is only a soft film covering the external operating part and the metal dome. This includes a waterproof layer. Because the metal dome and the internal circuit board must be in a conductive state, a waterproof layer cannot be set between the metal dome and the internal circuit board. This method actually only relies on the outermost protective layer to prevent water and dust. In harsh environments, these operable parts are easily damaged. Once any part is damaged, its protection will fail, resulting in a series of faults such as water ingress and short circuit.

[0005] The use of a touch keyboard can effectively solve the above problems because its external operating part does not need to be directly connected to the internal circuit and there is a hard board in the middle. However, touch keyboards also have their own problems. First of all, there are requirements for the touch source, and the touch object must be conductive. Moreover, the capacitance changes caused by touching objects with different conductivity are very different. This leads to the following problems. For example, if the parameters are configured in a bare-handed manner, in an actual environment, if someone is operating with gloves, it will be difficult for the device to detect the key information, or even not detect it at all. In addition, as coal dust and the like accumulate on the surface, the keyboard may also mistakenly sense the capacitance change. Utility Model Content

[0006] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a trigger structure and a capacitive touch keyboard which have good waterproof and dustproof effects, are convenient to operate with bare hands or wearing gloves, and have a good hand feel.

[0007] The technical solution adopted by the utility model to solve the technical problem is to propose a trigger structure, including:

[0008] A circuit board, wherein a conductor is provided on the circuit board, and the conductor is electrically connected to a circuit on the circuit board;

[0009] An insulating protection plate, covering the circuit board;

[0010] A conductive layer and an elastic member, wherein the conductive layer covers the insulating protective plate and forms an inductive capacitor between the conductive layer and the conductor; the elastic member is arranged between the conductive layer and the insulating protective plate; and the conductive layer has a pressing portion above the elastic member that can be pressed by an operator;

[0011] When the pressing portion is pressed, the distance between the conductive layer and the conductor changes, the inductive capacitance changes, and the elastic member is squeezed.

[0012] Furthermore, the elastic member is a metal spring.

[0013] Furthermore, the metal spring has an upper protrusion, and the upper protrusion is located directly above the conductor and directly below the pressing portion.

[0014] Furthermore, when the operator releases the pressing portion, the elastic member can restore the pressing portion to an initial position.

[0015] Furthermore, the elastic member supports the pressing portion, and forms a pressing action space between the pressing portion and the insulating protection plate.

[0016] Furthermore, the insulating protection plate is fixedly disposed above the circuit board and isolates the circuit on the circuit board from the external environment.

[0017] Furthermore, the conductive layer is a conductive silver paste layer.

[0018] Furthermore, the insulating protection plate is a hard transparent plate.

[0019] The technical solution adopted by the utility model to solve the technical problem is to also propose a capacitive touch keyboard, including:

[0020] A circuit board, wherein a plurality of conductors are provided on the circuit board, and the plurality of conductors are electrically connected to the circuit in the circuit board;

[0021] An insulating protective plate, which is disposed on the circuit board and isolates the circuit on the circuit board from the external environment;

[0022] A pot film is arranged on the insulating protection plate and includes a plurality of pots, and the plurality of pots correspond to the plurality of conductors one by one;

[0023] A functional mask is provided on the insulating protection plate and the pot film, wherein the functional mask has a conductive layer, and an inductive capacitor is formed between the conductive layer and the conductor; the functional mask is provided with a plurality of pressing parts that can be pressed by an operator, and the plurality of pressing parts correspond one-to-one to the plurality of conductors.

[0024] Furthermore, waterproof glue is provided between the insulating protection plate and the circuit board.

[0025] Compared with the prior art, the utility model has at least the following beneficial effects:

[0026] In the utility model, an insulating protective plate is arranged on the circuit board, which can play a role in waterproofing and dustproofing; an inductive capacitor is formed between the conductor and the conductive layer on the circuit board, and an elastic member is arranged between the insulating protective plate and the pressing part on the conductive layer. When the operator presses the pressing part, the distance between the conductive layer and the conductor will become smaller, thereby causing the inductive capacitor to change, and the chip can detect that the key is pressed (i.e., triggered), thereby responding. The setting of the conductive layer shields external capacitive interference. Whether the operator presses with fingers, wears gloves, presses through non-metallic devices, or presses through metal, the effect is the same and remains consistent, and the performance of the keyboard is not affected. In addition, a pot piece is provided, which can ensure both an excellent pressing feel and the resetting of the pressing part. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the natural state of the trigger structure of Example 1;

[0028] Figure 2 It is a schematic diagram of the trigger structure of the first embodiment after being triggered;

[0029] Figure 3 It is a schematic diagram of an exploded view of a capacitive touch keyboard according to the second embodiment.

[0030] In the figure:

[0031] 1. Circuit board; 2. Insulation protection plate; 3. Conductive layer; 3A. Functional mask; 4. Elastic part; 4A. Pot film; 5. Waterproof glue; 6. Display screen; 7. Display screen mounting frame; 8. Display screen PCB board; 9. Fixing part; 10. Conductor; 11. Mushroom head; 12. Light board PCB board; 13. Rotating shaft; 14. Bushing; 15. Bushing back seat; 16. Rotating part; 30. Pressing part; 40. Upper convex part; 400. Pressing action space; E. Electric field. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, in the present invention, the descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] Embodiment 1:

[0038] like Figure 1-Figure 2As shown, a trigger structure for a keyboard is applied to a keyboard, which can be a mechanical keyboard or a touch keyboard. The trigger structure mainly includes: a circuit board 1, an insulating protection plate 2, a conductive layer 3 and an elastic member 4.

[0039] The circuit board 1 is provided with a conductor 10, and the conductor 10 is connected to the circuit on the circuit board 1, and the circuit on the circuit board 1 is its built-in circuit. The insulating protective plate 2 is covered on the circuit board 1. Since the elastic member 4 (i.e., the pot piece) of this embodiment does not need to be connected to the circuit, and the pot piece of the existing keyboard must remain connected to the circuit, the insulating protective plate 2 cannot be set to achieve the waterproof and dustproof effect. The insulating protective plate 2 is a hard plastic plate of uniform thickness and a transparent plate. Its position is fixed and it is covered on the circuit board 1 to form a reliable sealing layer, which isolates the circuit on the circuit board 1 from the external environment, ensures that the operation of the circuit board 1 is not disturbed by the outside world, and can achieve the waterproof and dustproof effect.

[0040] Conductive layer 3 and elastic member 4, the conductive layer 3 covers the insulating protection plate 2, and an induced capacitor is formed between the conductive layer 3 and the conductor 10. Since the conductive layer 3 is the conductor 10, and the conductor 10 is also the conductor 10, an induced capacitor is formed between the two. The elastic member 4 is arranged between the conductive layer 3 and the insulating protection plate 2; the conductive layer 3 has a pressing portion 30 above the elastic member 4 for the operator to press. During use, when the operator presses the pressing portion 30, the spacing between the conductive layer 3 and the conductor 10 changes, the induced capacitor changes, and the elastic member 4 is squeezed. Specifically, when the pressing portion 30 is pressed, the spacing between the pressing portion 30 and the conductor 10 becomes smaller, the induced capacitor becomes larger, and the chip can detect the capacitance change and respond to it, that is, the triggering effect is achieved by pressing the pressing portion 30 of this embodiment.

[0041] It should be explained that the conductive layer 3 can be a separate component, or other components can be used as carriers, such as being arranged on the inner wall of other components. The conductive layer 3 of this embodiment is preferably a conductive silver paste layer, which is made of high-performance resin and highly conductive silver powder, and has excellent printability, conductivity, hardness and adhesion, and excellent anti-oxidation performance.

[0042] The elastic member 4 of this embodiment is a metal spring sheet, that is, a pot sheet. However, the pot sheet of this embodiment does not need to conduct the circuit. Its main function is to provide a reset elastic force for the reset of the pressing part 30. After the operator presses the pressing part 30, the pressing part 30 is released, and the elastic member 4 can restore the pressing part 30 to its initial position to facilitate the operator's next press. Among them, the metal spring sheet has an upper convex portion 40, and the upper convex portion 40 is directly above the conductor 10 and directly below the pressing part 30, that is, the pressing part 30, the upper convex portion 40 and the conductor 10 are arranged from top to bottom and are in opposite positions. The elastic member 4 supports the pressing part 30 and forms a pressing action space 400 between the pressing part 30 and the insulating protection plate 2. The pressing action space 400 ensures that the operator has space to press and ensures a good hand feel.

[0043] In actual use, this embodiment sets an insulating protection plate 2 on the circuit board 1, which can play a role in waterproofing and dustproofing; an inductive capacitor is formed between the conductor 10 and the conductive layer 3 on the circuit board 1, and the elastic member 4 is set between the insulating protection plate 2 and the pressing part 30 on the conductive layer 3. When the operator presses the pressing part 30, the distance between the conductive layer 3 and the conductor 10 will become smaller, thereby changing the inductive capacitance, and the chip can detect that the key is pressed (i.e., triggered), and respond. The setting of the conductive layer 3 shields external capacitance interference. Whether the operator presses with fingers, wears gloves, presses through non-metallic devices, or presses through metal, the effect is the same and remains consistent, and the performance of the keyboard is not affected. And the pot piece is set, which can not only ensure an excellent pressing feel, but also ensure the resetting of the pressing part 30.

[0044] Embodiment 2:

[0045] like Figure 3 Combined with Figure 1 and Figure 2 As shown, a capacitive touch keyboard is provided, and the trigger structure in the first embodiment is applied in the capacitive touch keyboard of this embodiment.

[0046] Capacitive touch keyboard mainly includes:

[0047] The circuit board 1 is a touch circuit board 1, and a plurality of conductors 10 are provided on the circuit board 1, and the plurality of conductors 10 are connected to the circuit in the circuit board 1. Specifically, the number of conductors 10 on the circuit board 1 can be determined according to the number of keys.

[0048] The insulating protective plate 2 is covered on the circuit board 1, and the insulating protective plate 2 isolates the circuit on the circuit board 1 from the external environment, wherein a waterproof glue 5 is provided between the insulating protective plate 2 and the circuit board 1 to ensure a good waterproof and dustproof effect.

[0049] The pot film 4A is arranged on the insulating protection plate 2, that is, in this embodiment, the pots under the multiple keys are formed into an integral pot film 4A. Therefore, the pot film 4A includes multiple pots, and the multiple pots correspond to the multiple conductors 10 one by one, that is, the number of pots can be determined according to the number of conductors 10, that is, according to the number of keys.

[0050] The functional mask 3A is covered with an insulating protection plate 2 and a pot film. The functional mask 3A has a conductive layer 3. The conductive layer 3, that is, a conductive silver paste layer, can be coated on the inner wall of the functional mask, and an inductive capacitor is formed between the conductive layer 3 and the conductor 10. The functional mask 3A is provided with a plurality of pressing parts 30 for the operator to press, and the plurality of pressing parts 30 correspond one-to-one to the plurality of conductors 10, that is, the number and arrangement positions of buttons, pressing parts 30, pot films and conductors 10 can correspond one-to-one.

[0051] Optionally, the keyboard of this embodiment also includes a display screen 6, a display screen mounting frame 7, a display screen PCB board 8, a fixing part 9, a mushroom head 11, a light board PCB board 12, a rotating shaft 13, a sleeve 14, a sleeve rear seat 15 and a rotating part 16. Since these components are conventional accessories of the keyboard, they are not described here in detail.

[0052] The keyboard of this embodiment:

[0053] Above the circuit board 1, there is an insulating protective plate 2 made of hard plastic with uniform thickness, which is fixed in position and forms a reliable sealing layer for the circuit board 1, isolating the external environment from the internal circuit, and can effectively protect the circuit board 1 and the built-in circuit of the circuit board 1. That is, compared with the mechanical keyboard with transmission, it can achieve complete isolation.

[0054] Above the insulation protection, pot pieces (i.e., elastic members 4) are arranged corresponding to the positions of each key. These pot pieces do not have the circuit on-off function, but are only used to stabilize the key action space and ensure excellent hand feel.

[0055] A layer of conductive silver paste is arranged above the pot piece (it can be brushed on the inside of the topmost functional mask). This layer of conductive silver paste is insulated from the outside, but can provide a stable conductive layer 3 to form another parallel capacitor in addition to the parasitic capacitor with the conductor 10 on the circuit board 1.

[0056] When the key is pressed, the pot piece is pressed down, causing the distance between the conductive layer 3 and the conductor 10 on the circuit board 1 to change, and the inductive capacitance also changes accordingly. In this way, the chip can detect the key and respond.

[0057] Because there is a conductive layer 3 inside the functional mask, it actually shields the external capacitance interference. In other words, no matter the operator presses with fingers, wears gloves, presses through non-metallic devices, or touches through metal devices, the performance of the keyboard will not be affected and the effect will remain consistent. That is, the change of the inductive capacitance only occurs internally and is not affected by changes in the external environment, and the consistency of operation is well guaranteed.

Claims

1. A trigger structure for a keyboard, characterized in that: include: A circuit board, wherein a conductor is provided on the circuit board, and the conductor is electrically connected to a circuit on the circuit board; An insulating protection plate, covering the circuit board; A conductive layer and an elastic member, wherein the conductive layer covers the insulating protective plate and forms an inductive capacitor between the conductive layer and the conductor; the elastic member is arranged between the conductive layer and the insulating protective plate; and the conductive layer has a pressing portion above the elastic member that can be pressed by an operator; When the pressing portion is pressed, the distance between the conductive layer and the conductor changes, the inductive capacitance changes, and the elastic member is squeezed.

2. The trigger structure for a keyboard according to claim 1, characterized in that: The elastic member is a metal spring.

3. The trigger structure for keyboard according to claim 2, characterized in that: The metal spring has an upper convex portion, and the upper convex portion is located directly above the conductor and directly below the pressing portion.

4. The trigger structure for a keyboard according to claim 1, 2 or 3, characterized in that: When the operator releases the pressing portion, the elastic member can restore the pressing portion to an initial position.

5. The trigger structure for keyboard according to claim 4, characterized in that: The elastic member supports the pressing portion and forms a pressing action space between the pressing portion and the insulating protection plate.

6. The trigger structure for keyboard according to claim 1, characterized in that: The insulating protection plate is fixedly arranged above the circuit board and isolates the circuit on the circuit board from the external environment.

7. The trigger structure for keyboard according to claim 1, characterized in that: The conductive layer is a conductive silver paste layer.

8. The trigger structure for keyboard according to claim 1, characterized in that: The insulating protection plate is a hard transparent plate.

9. A capacitive touch keyboard, characterized in that: include: A circuit board, wherein a plurality of conductors are provided on the circuit board, and the plurality of conductors are electrically connected to the circuit in the circuit board; An insulating protective plate, which is disposed on the circuit board and isolates the circuit on the circuit board from the external environment; A pot film is arranged on the insulating protection plate and includes a plurality of pots, wherein the plurality of pots correspond to the plurality of conductors one by one; A functional mask is provided on the insulating protection plate and the pot film, wherein the functional mask has a conductive layer, and an inductive capacitor is formed between the conductive layer and the conductor; the functional mask is provided with a plurality of pressing parts that can be pressed by an operator, and the plurality of pressing parts correspond one-to-one to the plurality of conductors.

10. The capacitive touch keyboard according to claim 9, characterized in that: Waterproof glue is provided between the insulating protection plate and the circuit board.

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