Capacitance shaft keyboard circuit

Abstract

The utility model relates to the technical field of capacitive shaft keyboards, and discloses a capacitive shaft keyboard circuit, which comprises a main control module; a voltage stabilizing module; an LED module; a keyboard plate module; and the voltage stabilizing module, the LED module and the key board module are electrically connected with the main control module. All information in the triggering process of the capacitor shaft is converted into electric signals through the tolerance controller, and the precision is as high as 0.04 mm. A user only needs to slightly press the key, and the keyboard can quickly respond and generate a trigger signal; a user is allowed to set a trigger point by himself / herself through driving, the interval can be 0.04 mm, great flexibility and individualized space are provided for the user, and the user can adjust the trigger force and stroke of the key according to own use habits and requirements, so that the input efficiency and comfort are optimized; according to the utility model, only one pin is required to have electrical performance to work, and other redundant pins can be abandoned or not adopted, so that the circuit structure is simplified, the production cost is reduced, and the reliability and stability of the circuit are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of capacitor shaft keyboard, concretely is a kind of capacitor shaft keyboard circuit. BACKGROUND

[0002] Capacitor shaft keyboard, commonly known as capacitive keyboard or capacitive mechanical keyboard, is a kind of keyboard type by detecting the change of capacitance to determine the state of key. By detecting the change of capacitance to determine the state of key. When the user presses the key on the keyboard, the capacitance under the key will be deformed, resulting in a change in capacitance, which is captured by the circuit inside the keyboard and converted into a corresponding electrical signal, so as to realize the triggering of key.

[0003] Through the search, the patent with the application number CN201410701346.4 discloses a static capacitance mechanical shaft switch and mechanical keyboard with simple process, low production cost, long stroke, stable touch, small wear rate, good contact stability and long service life. The mechanical keyboard includes a bottom cover, a middle plate, an upper cover, a static capacitance mechanical shaft switch, a circuit board and a capacitive detection chip. The static capacitance mechanical shaft switch includes a base, a spring arranged on the base, a movable shaft pressing the spring and slidingly matched with the base, an upper shell pressing the movable shaft and matched with the base, a fixed electrode and a movable electrode arranged on the base, and an insulating medium layer between the fixed electrode and the movable electrode. The spring arm on the movable electrode is in contact with the wedge-shaped inclined surface of the pawl of the movable shaft.

[0004] The standard key of current capacitor shaft keyboard usually only defaults an intermediate value as trigger point. This means that the user cannot fully utilize the high-precision characteristics of capacitor shaft, but is limited to the preset trigger point, which limits the user's personalized needs and input efficiency, limits the user's flexible adjustment of key trigger force in different scenarios, and reduces the applicability and flexibility of the keyboard. Due to the precision manufacturing and high quality requirements of capacitor shaft and tolerance controller, the production cost of capacitor shaft keyboard on the market is relatively high, so we need to propose a capacitor shaft keyboard circuit. UTILITY MODEL CONTENTS

[0005] The utility model discloses a purpose lies in providing a kind of capacitor shaft keyboard circuit, all information in the triggering process of capacitor shaft is converted into electric signal by tolerance controller, precision is as high as 0.04mm.This means that user only needs to press key slightly, keyboard can respond rapidly and produce trigger signal, provide extremely sensitive and accurate input experience;Allow user to set trigger point by driving self, interval can be done 0.04mm, provide great flexibility and individuality space for user, user can adjust the trigger intensity and stroke of key according to own use habit and demand, to optimize input efficiency and comfort degree;Only a pin has electric performance can work, other redundant pins can be discarded or not be used, not only simplify circuit structure, reduce production cost, also improve the reliability and stability of circuit, to solve the problem proposed in the above background technique.

[0006] To realize the above-mentioned purpose, the utility model provides the following technical scheme: a kind of capacitor shaft keyboard circuit, comprising:

[0007] the tolerance signal of capacitor shaft is output electric signal by A / D converter main control module;

[0008] voltage stabilizing module for providing stable and reliable voltage output;

[0009] LED module for reminding capacitor shaft signal trigger;

[0010] keypad module for receiving capacitor shaft trigger signal;

[0011] The voltage stabilizing module, LED module and keypad module are electrically connected to the main control module.

[0012] Preferably, the main control module includes a control chip D2, a terminal block P1, a terminal block P2 and a terminal block P5. The voltage stabilizing module is connected to the terminal block P1, the terminal block P5, the terminal block P5 and the control chip D2 respectively. The LED module and the keypad module are connected to the control chip D2.

[0013] Preferably, the 3-pin of the terminal block P1 is connected to the 19-pin of the control chip D2, the 4-pin of the terminal block P1 is connected to the 18-pin of the control chip D2, the 5-pin of the terminal block P1 is connected to the 17-pin of the control chip D2, and the 6-pin of the terminal block P1 is connected to the 16-pin of the control chip D2.

[0014] The 2-pin of the terminal block P2 is connected to the 4-pin of the control chip D2, the 3-pin of the terminal block P2 is connected to the 5-pin of the control chip D2, and the 10-pin of the control chip D2 is connected to a resistor R3, a keypad K22 and a capacitor C2 in parallel.

[0015] Preferably, the voltage stabilizing module comprises a voltage stabilizing chip U1, the 2-pin of the voltage stabilizing chip U1 is connected with a ground capacitor C1 and a 5V input diode D24 respectively, the 3-pin of the voltage stabilizing chip U1 is connected with a power switch J1 and a series-connected resistor R1 and light emitting diode D1 respectively.

[0016] Preferably, the LED module comprises a plurality of light emitting units, the light emitting unit comprises a series-connected light emitting diode D3 and resistor R4, one end of the resistor R4 is connected to the resistor R3, and the 2-pin of the light emitting diode D3 is connected to the 27-pin of the control chip D2.

[0017] Preferably, the key plate module comprises a capacitor key chip D18 and a terminal block P3, a plurality of keys are connected to the KEY pin of the capacitor key chip D18, the 3-pin of the terminal block P3 is connected to the 26-pin of the capacitor key chip D18, the 4-pin of the terminal block P3 is connected to the 25-pin of the capacitor key chip D18, the 5-pin of the terminal block P3 is connected to the 28-pin of the capacitor key chip D18, and the 6-pin of the terminal block P3 is connected to the 27-pin of the capacitor key chip D18.

[0018] Compared with the prior art, the utility model has the advantages that:

[0019] 1. The tolerance controller converts all information in the capacitor shaft triggering process into electrical signals, with a precision of 0.04mm. This means that users only need to press the keys slightly, and the keyboard can quickly respond and generate a trigger signal, providing extremely sensitive and accurate input experience.

[0020] 2. The utility model allows users to set the trigger point by driving themselves, with an interval of 0.04mm, providing great flexibility and personalized space for users. Users can adjust the trigger force and stroke of the keys according to their own usage habits and needs, thereby optimizing input efficiency and comfort.

[0021] 3. The utility model only needs one pin with electrical performance to work, and the other redundant pins can be discarded or not used, which not only simplifies the circuit structure, reduces the production cost, but also improves the reliability and stability of the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The system block diagram of the utility model;

[0023] Figure 2 The circuit diagram of the main control module of the utility model;

[0024] Figure 3 The circuit diagram of the voltage stabilizing module of the utility model;

[0025] Figure 4 The circuit diagram of the LED module of the utility model;

[0026] Figure 5 The circuit diagram of the key plate module of the utility model. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model. Apparently, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0028] Please refer to Figures 1-5 The utility model provides a technical scheme: a capacitor shaft keyboard circuit, comprising:

[0029] The tolerance signal of the capacitor shaft is outputted through the main control module of A / D converter electric signal;

[0030] The main control module includes control chip D2, wiring seat P1, wiring seat P2, wiring seat P5, and the control chip D2 is the control chip of tolerance controller, the voltage stabilizing module is connected with wiring seat P1, wiring seat P5, wiring seat P5, control chip D2 respectively, and the LED module and the key plate module are connected on the control chip D2.

[0031] The 3-pin of wiring seat P1 is connected on the 19-pin of control chip D2, the 4-pin of wiring seat P1 is connected on the 18-pin of control chip D2, the 5-pin of wiring seat P1 is connected on the 17-pin of control chip D2, and the 6-pin of wiring seat P1 is connected on the 16-pin of control chip D2.

[0032] The 2-pin of wiring seat P2 is connected with the 4-pin of control chip D2, the 3-pin of wiring seat P2 is connected with the 5-pin of control chip D2, and the 10-pin of control chip D2 is connected with resistance R3, parallelly arranged key K22 and capacitor C2 respectively.

[0033] The wiring end of the 2-pin of wiring seat P2 and the 4-pin of control chip D2 is connected with resistance R2 for providing power supply voltage.

[0034] The voltage stabilizing module for providing stable and reliable voltage output;

[0035] The voltage stabilizing module comprises a voltage stabilizing chip U1, the 2-pin of the voltage stabilizing chip U1 is respectively connected with a ground capacitor C1 and a 5V input diode D24, the 3-pin of the voltage stabilizing chip U1 is respectively connected with a power switch J1, a series resistor R1 and a light emitting diode D1. The 3-pin of the voltage stabilizing chip U1 outputs a power supply voltage, which is used for power supply of the main control module, the LED module and the key plate module.

[0036] LED module for reminding the capacitor shaft signal trigger;

[0037] The LED module comprises a plurality of light emitting units, specifically, the light emitting unit is provided with 20, that is, one light emitting unit can control 20 capacitor shafts, and the amount of the tolerance conversion controller depends on the number of keys of the keyboard.

[0038] The light emitting unit comprises a series-connected light emitting diode D3 and a resistor R4, one end of the resistor R4 is connected to the resistor R3, and the 2-pin of the light emitting diode D3 is connected to the 27-pin of the control chip D2.

[0039] The light emitting unit further comprises a series-connected light emitting diode D6 and a resistor R7.

[0040] The light emitting unit further comprises a series-connected light emitting diode D9 and a resistor R10.

[0041] The light emitting unit further comprises a series-connected light emitting diode D13 and a resistor R14.

[0042] The resistors R7, R10 and R14 are all connected to the power supply voltage, the 2-pin of the light emitting diode D6 is connected to the 26-pin of the control chip D2, the 2-pin of the light emitting diode D9 is connected to the 25-pin of the control chip D2, and the 2-pin of the light emitting diode D13 is connected to the 24-pin of the control chip D2. Other light emitting units all comprise a light emitting diode and a resistor, which will not be described here.

[0043] Key plate module for receiving the capacitor shaft trigger signal;

[0044] The key plate module comprises a capacitor key chip D18 and a terminal block P3, the capacitor key chip D18 is a chip of the tolerance conversion controller, a plurality of keys are connected to the KEY pin of the capacitor key chip D18, the keys are provided with twenty (the number of keys is the same as the number of light emitting units), and the twenty keys are sequentially connected to the 1-pin-20-pin of the capacitor key chip D18.

[0045] The 3-pin connector of the terminal block P3 is connected to the 26-pin of the capacitor button chip D18, the 4-pin connector of the terminal block P3 is connected to the 25-pin of the capacitor button chip D18, the 5-pin connector of the terminal block P3 is connected to the 28-pin of the capacitor button chip D18, and the 6-pin connector of the terminal block P3 is connected to the 27-pin of the capacitor button chip D18.

[0046] The voltage stabilizing module, the LED module and the button plate module are electrically connected with the main control module.

[0047] The capacitor shaft keyboard has the advantages that the keyboard control circuit outputs an electric signal through an A / D converter through the capacitance signal of the capacitor shaft, generates a trigger instruction through the keyboard MCU, and communicates with a computer to realize key information input.

[0048] The capacitance controller can convert all information in the trigger process of the capacitor shaft into an electric signal, and the precision can reach 0.04 mm, that is, a trigger signal can be generated as long as 0.04 mm is pressed. However, such precision is not needed in actual use, and a standard key only defaults an intermediate value, and other precision requirements are set in the computer driver for users to set or select.

[0049] In addition, only one pin with electrical performance is needed to work. The other redundant pins can be abandoned or not used. In terms of cost, only one pin with electrical performance is reserved.

[0050] The capacitor shaft keyboard can be a linear capacitor shaft (that is, straight up and down when moving, without a card point, and the trigger point can be set by the drive, and the interval can reach 0.04 mm); or a paragraph capacitor shaft (that is, when moving, there are fixed card points or touch points, which need to be adjusted by the drive), but when the paragraph capacitor shaft is used, other trigger precision cannot be set, and only one trigger state can be fixed.

[0051] The structure of the capacitor shaft keyboard is composed of a keyboard lower cover, a PCBA, a keyboard middle plate, a capacitor shaft, a keycap and the like. The connection mode between the above structures is the prior art, which will not be described here.

[0052] The capacitor shaft keyboard can place a tin paper with the same size as the PCB in the lower cover to balance the space capacitance and ensure the accuracy of the capacitance error during use.

[0053] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A capacitive shaft keyboard circuit, characterized by The utility model relates to a kind of capacitive axis signal trigger reminding device, including: The main control module that the tolerance signal of capacitive axis is exported electric signal by A / D converter; Voltage stabilizing module for providing stable and reliable voltage output; LED module for reminding capacitive axis signal trigger; Key pad module for receiving capacitive axis trigger signal; The voltage stabilizing module, LED module, key pad module are electrically connected with main control module.

2. A capacitive rotary keyboard circuit according to claim 1, characterized in that: The main control module includes control chip D2, terminal block P1, terminal block P2, terminal block P5, the voltage stabilizing module is connected with terminal block P1, terminal block P2, terminal block P5, control chip D2 respectively, the LED module, key pad module are connected on control chip D2.

3. A capacitive rotary keyboard circuit according to claim 2, characterized in that: The 3-pin of terminal block P1 is connected on the 19-pin of control chip D2, the 4-pin of terminal block P1 is connected on the 18-pin of control chip D2, the 5-pin of terminal block P1 is connected on the 17-pin of control chip D2, the 6-pin of terminal block P1 is connected on the 16-pin of control chip D2; The 2-pin of terminal block P2 is connected with the 4-pin of control chip D2, the 3-pin of terminal block P2 is connected with the 5-pin of control chip D2, the 10-pin of control chip D2 is respectively connected with resistance R3, parallelly arranged key K22 and capacitor C2.

4. A capacitive rotary keyboard circuit according to claim 3, characterized in that: The voltage stabilizing module includes voltage stabilizing chip U1, the 2-pin of voltage stabilizing chip U1 is respectively connected with ground capacitor C1, diode D24 connected with 5V input, the 3-pin of voltage stabilizing chip U1 is respectively connected with power switch J1, series resistance R1 and light emitting diode D1.

5. A capacitive rotary keyboard circuit according to claim 4, characterized in that: The LED module includes a plurality of light emitting units, the light emitting unit includes series light emitting diode D3, resistance R4, one end of resistance R4 is connected on resistance R3, the 2-pin of light emitting diode D3 is connected on the 27-pin of control chip D2.

6. A capacitive rotary keyboard circuit according to claim 5, characterized in that: The key pad module includes capacitor key chip D18, terminal block P3, the KEY pin of capacitor key chip D18 is connected with a plurality of keys, the 3-pin of terminal block P3 is connected on the 26-pin of capacitor key chip D18, the 4-pin of terminal block P3 is connected on the 25-pin of capacitor key chip D18, the 5-pin of terminal block P3 is connected on the 28-pin of capacitor key chip D18, the 6-pin of terminal block P3 is connected on the 27-pin of capacitor key chip D18.

Images