CN204066029U - Active capacitance pen - Google Patents

Abstract

The utility model discloses an active electric capacity pen, including a shell, a battery, circuit board and touch-control nib, battery and touch-control nib all are connected with the circuit board, circuit board and battery set up in a shell, be provided with interconnect's antenna receiving unit and signal processing unit on the circuit board, the interference signal of peripheral electronic equipment is received to the antenna receiving unit and input to the signal processing unit, the drive signal that generates and correspond with interference signal after the signal processing unit is handled interference signal, thereby the touch-control nib is with the electric capacity screen of drive signal coupling to electronic equipment with disturbing the touch-control position of electric capacity screen confirmation. Compared with the prior art, because the utility model discloses active electric capacity pen is through antenna reception electronic equipment's interfering signal to when the staff does not have direct contact electric capacity pen (if the staff is wearing gloves and is using active electric capacity pen in cold weather), still can realize the touch-control operation to the electric capacity screen.

Description

active capacitive pen

technical field

The utility model relates to a capacitor pen, in particular to an active capacitor pen.

Background technique

Capacitive touch screen CTP (Capacity Touch Panel) works by using the current induction of the human body. The capacitive screen is a four-layer composite glass screen. The inner surface of the glass screen and the interlayer are each coated with a layer of ITO (nano indium tin oxide). As a working surface, four electrodes are drawn from the four corners, and the inner layer of ITO is the screen layer to ensure the working environment. When the user touches the capacitive screen, due to the electric field of the human body, the user's finger and the working surface form a coupling capacitance. Because the working surface is connected with a high-frequency signal, the finger absorbs a small current, which flows from the four corners of the screen respectively. Theoretically, the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller obtains the position through precise calculation of the four current ratios. This method can achieve 99% accuracy and has a response speed of less than 3ms.

With the popularity of capacitive touch screens, capacitive pens have begun to appear, which use conductive materials to imitate human bodies (usually fingers) to complete a kind of auxiliary device for man-machine dialogue. At present, there are various capacitive pen technologies, such as the active capacitive pen solution released by Atmel in June 2012. There are sensors inside the active capacitive pen, which will actively detect the signal in the capacitive screen to give a response signal. It can be very thin, like the probe of an oscilloscope, to couple the signal to the processing unit inside the capacitive pen. However, the existing active capacitive stylus needs human hands to directly touch the stylus body. In cold weather, if the user wears gloves, the touch screen cannot be operated.

Utility model content

The purpose of the utility model is to provide an active capacitive pen, which can still realize the operation on the touch screen when the human hand does not directly touch the pen body.

In order to achieve the above object, the utility model provides an active capacitive pen, comprising a pen case, a battery, a circuit board and a stylus tip, both the battery and the stylus tip are connected to the circuit board, and the circuit The board and the battery are arranged in the pen case, wherein the circuit board is provided with an antenna receiving unit and a signal processing unit connected to each other, and the antenna receiving unit receives the interference signal of the peripheral electronic equipment and inputs it into the signal A processing unit, the signal processing unit processes the interference signal and generates a driving signal corresponding to the interference signal, and the stylus tip couples the driving signal to the capacitive screen of the electronic device to interfere with the The capacitive screen thus determines the touch position.

Compared with the prior art, the active capacitive pen of the present invention receives the interference signal of peripheral electronic equipment through the antenna receiving unit, and then the signal processing unit processes the interference signal to generate a driving signal corresponding to the interference signal, and then the stylus tip will The driving signal is coupled to the capacitive screen of the electronic device to interfere with the capacitive screen so that the touch position can be determined. Since the active capacitive pen receives the interference signal of the electronic device through the antenna, the human hand does not directly touch the capacitive pen (such as in cold weather. When wearing gloves and using an active capacitive stylus), the touch operation of the capacitive screen can still be realized.

Preferably, the signal processing unit includes comparative amplifiers U1, U2, resistors R1, R2, and capacitors C1, C2, C3, and C4, the inverting input terminal of the comparative amplifier U1 is connected to one end of the capacitor C1 and the capacitor C2 The capacitor C3 is connected between the inverting input terminal and the output terminal of the comparative amplifier U1, and the output terminal of the comparative amplifier U1 is connected to the inverting input terminal of the comparative amplifier U2 through the resistor R1, The resistor R2 is connected between the inverting input terminal and the output terminal of the comparative amplifier U2, the output terminal of the comparative amplifier U2 is connected to the other end of the C2 through the capacitor C4, and the comparative amplifier U1 and The non-inverting input terminal of the comparison amplifier U2 is grounded.

Preferably, the antenna receiving unit includes at least two receiving antennas, and at least one of the receiving antennas is connected to the inverting input terminal of the comparison amplifier U1.

Preferably, the antenna receiving unit includes a switch key Key and two receiving antennas ANT1 and ANT2, the switch key Key is connected between the receiving antennas ANT1 and ANT2, the receiving antenna ANT1 is connected to the other end of the capacitor C1 connect.

Preferably, the antenna receiving unit further includes a receiving antenna ANT3, and the signal processing unit further includes a capacitor C5, one end of the capacitor C5 is connected to the inverting input end of the comparison amplifier U2, and the other end of the capacitor C5 One end is connected with the receiving antenna ANT3.

Preferably, the active capacitive stylus further includes a single-key trigger key, and an opening for the single-key trigger key to extend out of the pen shell is provided on the pen case.

Preferably, a charging unit, a power supply and a one-key trigger unit are also arranged on the circuit board.

Preferably, the charging unit includes a USB interface J1, resistors R3, R4, R5, a capacitor C6, a chip S52A, and a light-emitting diode LED1, the pin 1 of the USB interface J1 is connected to one end of the resistor R3, and the resistor The other end of R3 is connected to the capacitor C6, the anode of the light emitting diode LED1 and pin 4 of the chip S52A, the cathode of the light emitting diode LED1 is connected to one end of the resistor R5, and the other end of the resistor R5 Connect with pin 1 of the chip S52A, pin 6 of the chip S52A is grounded through the resistor R4, pin 3 of the chip S52A outputs power supply VCC, pin 4 of the USB interface J1 is grounded, and the capacitor C6 The other end and pin 2 of the chip S52A are grounded.

Preferably, the battery is a lithium battery.

The utility model will become clearer through the following description in conjunction with the accompanying drawings, which are used to explain the embodiments of the utility model.

Description of drawings

FIG. 1 is a structural diagram of an embodiment of the active capacitive pen of the present invention.

FIG. 2 is a structural block diagram of the circuit board in FIG. 1 .

FIG. 3 is a circuit diagram of a first embodiment of the antenna receiving unit and the signal processing unit in FIG. 2 .

FIG. 4 is a circuit diagram of a second embodiment of the antenna receiving unit and the signal processing unit in FIG. 2 .

FIG. 5 is a circuit diagram of a third embodiment of the antenna receiving unit and the signal processing unit in FIG. 2 .

FIG. 6 is a circuit diagram of a fourth embodiment of the antenna receiving unit and the signal processing unit in FIG. 2 .

FIG. 7 is a circuit diagram of the charging unit in FIG. 2 .

FIG. 8 is a circuit diagram of the power supply and the single-key trigger unit in FIG. 2 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further, and this is the preferred embodiment of the utility model.

Example 1

Embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements. The electronic device in the utility model is a device using a capacitive touch screen, such as a mobile phone, a tablet computer, a notebook computer, and the like.

Please refer to FIG. 1 to FIG. 2 , FIG. 1 is a structural diagram of an embodiment of the active capacitive pen 100 of the present invention, and FIG. 2 is a structural block diagram of the circuit board 12 in FIG. 1 . As can be seen from FIGS. 1 and 2 , the active capacitive pen 100 of the present invention includes a pen case 10 , a battery 11 , a circuit board 12 and a stylus tip 13 . Wherein, the battery 11 and the stylus tip 13 are all connected to the circuit board 12, the circuit board 12 and the battery 11 are arranged in the pen case 10, the battery 11 is used to provide working power for the active capacitive pen, and the circuit board 12 is provided with interconnecting The antenna receiving unit 121 and the signal processing unit 123, the antenna receiving unit 121 is used to receive the interference signal of peripheral electronic equipment and input it to the signal processing unit 123, and the signal processing unit 123 generates the drive signal corresponding to the interference signal after processing the interference signal , the stylus tip 14 is used to couple the generated drive signal to the capacitive screen of the electronic device to interfere with the capacitive screen so as to determine the touch position.

During work, the antenna receiving unit 121 receives the interference signal (i.e. pulse interference source) of peripheral electronic equipment and self-excited oscillation of this circuit, and sends the received interference signal to the signal processing unit 123, and the signal processing unit 123 will receive the interference signal The signal self-oscillates to generate a drive signal, and then the stylus 13 couples the generated drive signal to interfere with the capacitive screen; wherein the drive signal is related to the amplitude, frequency and phase of the received interference signal. When the capacitive pen approaches or touches the capacitive screen, the self-excited amplitude of the signal processing unit 123 decreases, and the signal processing unit 123 works in a driving state instantaneously, thereby interfering with the original signal on the capacitive screen, which facilitates the determination of the touch position.

Compared with the prior art, the active capacitive pen 100 of the present invention receives the interference signal of peripheral electronic equipment through the antenna receiving unit 121, and then the signal processing unit 123 processes the interference signal to generate a driving signal corresponding to the interference signal, and then touches the The control pen head 14 couples the drive signal to the capacitive screen of the electronic device to interfere with the capacitive screen so that the touch position can be determined. Since the active capacitive pen 100 receives the interference signal of the electronic device through the antenna, the human hand does not directly touch the capacitive pen ( For example, when people wear gloves and use the active capacitive pen 100) in cold weather, touch operations on the capacitive screen can still be realized.

Specifically, as shown in Figure 3, the signal processing unit 123 of the present invention includes comparative amplifiers U1, U2, resistors R1, R2 and capacitors C1, C2, C3, C4, the inverting input terminal of the comparative amplifier U1 is connected to the capacitor C1 and the capacitor One end of C2 is connected, and a capacitor C3 is connected between the inverting input terminal and the output terminal of the comparative amplifier U1. A resistor R2 is connected between the terminal and the output terminal, the output terminal of the comparative amplifier U2 is connected to the other terminal of C2 through the capacitor C4, and the non-inverting input terminals of the comparative amplifier U1 and the comparative amplifier U2 are grounded.

Specifically, the antenna receiving unit 121 includes at least two receiving antennas, and at least one of the receiving antennas is connected to the inverting input terminal of the comparative amplifier U1. In the first embodiment (as shown in FIG. 3 ), the antenna receiving unit 121 includes a switch button Key and two receiving antennas ANT1, ANT2, the switch button Key is connected between the receiving antenna ANT1 and ANT2, and the receiving antenna ANT1 is connected to another connection of the capacitor C1. Connected at one end. After the antenna receiving unit 121 receives the surrounding wireless signal interference source (including the interference signal from the peripheral electronic equipment and the interference signal generated by the self-excited oscillation of this circuit), it inputs to the comparison amplifier U1 of the signal processing unit 123, and the signal interference source drives the comparison The amplifiers U1 and U2, and the self-excitation of the comparison amplifiers U1 and U2, generate a drive signal that is opposite to the interference signal and output the drive signal to the capacitive screen to interfere with the capacitive screen to complete the touch operation.

Please refer to FIG. 4 again, which is a circuit diagram of a second embodiment of the antenna receiving unit 121 and the signal processing unit 123 . As shown in FIG. 4, the antenna receiving unit 121 further includes a receiving antenna ANT3 compared to the embodiment shown in FIG. 3, and the signal processing unit 123 further includes a capacitor C5 compared to the embodiment shown in FIG. The reverse input end is connected, and the other end of the capacitor C5 is connected with the receiving antenna ANT3.

Please refer to FIG. 5 , which is a circuit diagram of a third embodiment of the antenna receiving unit 121 and the signal processing unit 123 . As shown in FIG. 5, the antenna receiving unit 121 includes receiving antennas ANT4, ANT5, and ANT6, and the signal processing unit 123 includes comparative amplifiers U1, U2, resistors R1, R2, capacitors C1, C2, C3, C4, C5, C11, and C12. The connection relationship of the comparative amplifiers U1, U2, resistors R1, R2, and capacitors C1, C2, C3, C4, and C5 is the same as that of the embodiment shown in FIG. 4 . The receiving antenna ANT4 is connected to the other end of the capacitor C1, the receiving antenna ANT5 is connected to the other end of the capacitor C5, the receiving antenna ANT36 is connected to one end of the capacitor C11, the other end of the capacitor C11 is connected to the capacitor C4 and one end of the capacitor C12, and the capacitor C12 The other end is grounded.

Please refer to FIG. 6 again, which is a circuit diagram of a fourth embodiment of the antenna receiving unit 121 and the signal processing unit 123 . As shown in FIG. 6 , the antenna receiving unit 121 includes receiving antennas ANT7 and ANT8 , and the signal processing unit 123 includes comparative amplifiers U1 , U2 , resistors R1 , R2 , and capacitors C1 , C2 , C3 , C4 , and C5 . Wherein the connection relation of comparison amplifier U1, U2, resistor R1, R2 and capacitor C1, C2, C3, C4, C5 is the same as the embodiment shown in Fig. 4, the difference is that the receiving antenna ANT7 is connected with the other end of capacitor C1, and the receiving antenna ANT8 is connected to the other end of capacitor C5.

It should be noted that, among the above embodiments of the antenna receiving unit 121 and the signal processing unit 123 , the embodiment shown in FIG. 3 has a better effect.

In addition, the active capacitive pen 100 of the present invention also includes a single-key trigger key 14, the pen case 10 is provided with an opening for the single-key trigger key 14 to protrude from the pen case 10, and the circuit board 12 is also provided with a charging unit 125 and a power supply. And the one-key trigger unit 127. The battery 11 can be a rechargeable battery or a general battery, and the battery 1 in this embodiment is a lithium battery. The stylus tip 13 is an ultra-fine tip, and the stylus tip 13 can produce very fine tip electrodes. The single-key trigger unit 127 is a trigger circuit specially developed for the unique algorithm of iPhone.

Specifically, as shown in FIG. 7, the charging unit 125 includes a USB interface J1, resistors R3, R4, R5, a capacitor C6, a chip S52A, and a light-emitting diode LED1. Pin 1 of the USB interface J1 is connected to one end of the resistor R3. The other end is connected to the capacitor C6, the anode of the light-emitting diode LED1 and the pin 4 of the chip S52A, the cathode of the light-emitting diode LED1 is connected to one end of the resistor R5, the other end of the resistor R5 is connected to the pin 1 of the chip S52A, and the pin 6 of the chip S52A passes through The resistor R4 is grounded, the pin 3 of the chip S52A outputs the power supply VCC, the pin 4 of the USB interface J1 is grounded, the other end of the capacitor C6 and the pin 2 of the chip S52A are grounded.

Specifically, as shown in FIG. 8, the power supply and single-key trigger unit 127 includes a switch S1, a chip U3, a chip CJ01, an interface P1, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, and capacitors C7, C8, and C9. , C10, CS1, CS2, CS3, inductor L1, light emitting diode LED2 and chip D1. Specifically, the pin 1 of the interface P1 is grounded, the pin 2 of the interface P1 is connected to the power supply VCC and one end of the switch S1, the other end of the switch S1 is connected to the resistor R6, the capacitor CS1 and the pin 1 of the chip U3, and the pin 2 of the chip U3, Pin 3 is connected to one end of capacitor CS2, the other end of capacitor CS2 is grounded, pin 4 of chip U3 is grounded, pins 6, 7, and 8 of chip U3 are connected to power supply VCC, pin 5 of chip U3 is connected to capacitor CS3 and one end of resistor R8 And the pin 3 of the chip CJ01 is connected, the other end of the capacitor CS3 and the resistor R8 is grounded, the pin 1 of the chip CJ01 is connected with the inductor L1 and one end of the capacitor C8, the other end of the capacitor C8 is connected with the pin 3 of the chip D1, and the pin of the chip D1 1 Connect to the power supply-VS and one end of capacitor C10, the other end of capacitor C10 is grounded, pin 2 of chip D1 and pin 2 of chip CJ01 are grounded, the other end of inductor L1 is connected to pin 6 of chip CJ01, one end of capacitor C3 and the power supply VCC connection, the other end of capacitor C3 is grounded, pin 5 of chip CJ01 is connected to resistor R8, capacitor C9, resistor R10 and power supply +VS, pin 4 of chip CJ01 is connected to the other end of resistor R8 and one end of resistor R9, resistor R9 The other end of the resistor R10 and the other end of the capacitor C9 are grounded, the other end of the resistor R10 is connected to the anode of the light emitting diode LED2, the cathode of the light emitting diode LED2 is grounded, and the switch S1 is the single-key trigger key 14.

The above-mentioned chip U3 is a 74xxx2G74 series, and the chip D1 is a BAS40-04.

The utility model has been described above in conjunction with the best embodiments, but the utility model is not limited to the above-disclosed embodiments, but should cover various modifications and equivalent combinations based on the essence of the utility model.

Claims (9)

1. An active capacitive pen, comprising a pen case, a battery, a circuit board and a stylus tip, the battery and the stylus tip are all connected to the circuit board, and the circuit board and the battery are arranged on the In the pen case, it is characterized in that an antenna receiving unit and a signal processing unit connected to each other are arranged on the circuit board, and the antenna receiving unit receives the interference signal of peripheral electronic equipment and inputs it to the signal processing unit, and the The signal processing unit processes the interference signal to generate a drive signal corresponding to the interference signal, and the stylus tip couples the drive signal to the capacitive screen of the electronic device to interfere with the capacitive screen so as to determine the touch control position. 2. The active capacitive pen as claimed in claim 1, wherein the signal processing unit comprises comparative amplifiers U1, U2, resistors R1, R2 and capacitors C1, C2, C3, C4, the comparative amplifier U1 The inverting input terminal is connected to one end of the capacitor C1 and the capacitor C2, the capacitor C3 is connected between the inverting input terminal and the output terminal of the comparative amplifier U1, and the output terminal of the comparative amplifier U1 passes through the resistor R1 is connected to the inverting input terminal of the comparative amplifier U2, the resistor R2 is connected between the inverting input terminal and the output terminal of the comparative amplifier U2, and the output terminal of the comparative amplifier U2 is connected to the inverting input terminal of the comparative amplifier U2 through the capacitor C4. The other end of the C2 is connected, and the non-inverting input ends of the comparative amplifier U1 and the comparative amplifier U2 are grounded. 3. The active capacitive pen according to claim 2, wherein the antenna receiving unit comprises at least two receiving antennas, and at least one of the receiving antennas is connected to the inverting input terminal of the comparative amplifier U1 connect. 4. The active capacitive pen according to claim 3, wherein the antenna receiving unit comprises a switch key Key and two receiving antennas ANT1, ANT2, and the switch key Key is connected between the receiving antennas ANT1 and ANT2 , the receiving antenna ANT1 is connected to the other end of the capacitor C1. 5. The active capacitive pen according to claim 4, wherein the antenna receiving unit also includes a receiving antenna ANT3, and the signal processing unit also includes a capacitor C5, one end of the capacitor C5 is connected to the comparison amplifier The reverse input end of U2 is connected, and the other end of the capacitor C5 is connected with the receiving antenna ANT3. 6. The active capacitive pen according to claim 1, wherein the active capacitive pen also includes a single-key trigger key, and the pen case is provided with a device for the single-key trigger key to stretch out the pen. opening of the shell. 7. The active capacitive pen according to claim 6, wherein a charging unit, a power supply and a single-key triggering unit are also arranged on the circuit board. 8. The active capacitive pen according to claim 7, wherein the charging unit comprises a USB interface J1, resistors R3, R4, R5, a capacitor C6, a chip S52A and a light-emitting diode LED1, and the USB interface J1 Pin 1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the capacitor C6, the anode of the light emitting diode LED1 and pin 4 of the chip S52A, the cathode of the light emitting diode LED1 is connected to the One end of the resistor R5 is connected, the other end of the resistor R5 is connected to the pin 1 of the chip S52A, the pin 6 of the chip S52A is grounded through the resistor R4, and the pin 3 of the chip S52A outputs the power supply VCC, so Pin 4 of the USB interface J1 is grounded, and the other end of the capacitor C6 and pin 2 of the chip S52A are grounded. 9. The active capacitive pen according to claim 1, wherein the battery is a lithium battery.