WO2018170871A1 - 一种电容笔***、电容笔及电容笔控制电路 - Google Patents

一种电容笔***、电容笔及电容笔控制电路 Download PDF

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Publication number
WO2018170871A1
WO2018170871A1 PCT/CN2017/078034 CN2017078034W WO2018170871A1 WO 2018170871 A1 WO2018170871 A1 WO 2018170871A1 CN 2017078034 W CN2017078034 W CN 2017078034W WO 2018170871 A1 WO2018170871 A1 WO 2018170871A1
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Prior art keywords
module
circuit unit
passive
electronic device
capacitive pen
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PCT/CN2017/078034
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English (en)
French (fr)
Inventor
魏海军
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深圳市汇顶科技股份有限公司
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to PCT/CN2017/078034 priority Critical patent/WO2018170871A1/zh
Priority to CN201780000199.XA priority patent/CN108934180B/zh
Publication of WO2018170871A1 publication Critical patent/WO2018170871A1/zh

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  • the embodiment of the invention belongs to the field of capacitive pens, and in particular relates to a capacitive pen system, a capacitive pen and a capacitive pen control circuit.
  • Active capacitive pens as the main peripheral input accessories for electronic devices with touch screens, are gradually gaining market attention.
  • the user has the need to erase the existing content in addition to writing the new content normally.
  • the first way is based on the software implementation of the electronic device.
  • the active capacitive pen only transmits the signal through the pen tip.
  • the active capacitive pen and the electronic device cannot recognize the current intention of the user to write or erase through the pen tip signal.
  • the tip of the active capacitive pen is defaulted to the writing mode, if there is an erasing requirement, the writing mode needs to be switched to the erasing mode by the software setting of the electronic device, and the tip of the active capacitive pen is used for the writing.
  • the erase operation is performed, and after the erase is completed, the mode is switched to the normal writing mode.
  • This implementation method does not require an active capacitive pen for special processing, and the universal active capacitive pen can be supported, but the manual switching mode is required during operation, which affects the user experience.
  • the second way is that the active capacitive pen end first recognizes the user's intention to erase the behavior.
  • the active capacitive pen can only transmit the signal at the tip and the end of the pen, wherein the pen tail signal is different from the pen tip signal, and the electronic device
  • the writing signal or the erasing signal is recognized by the characteristics of the tail signal and the tip signal;
  • a typical way is to design a transmitting electrode at the tip of the pen and the tail to realize the writing and erasing functions respectively, and when writing normally, the electronic device The pen tip signal is detected.
  • the electronic device When the user inverts the pen body and touches the tail of the electronic device to use the erasing function, the electronic device detects the tail signal, and the frequency of the signal emitted by the pen tip electrode and the cap electrode is different, thereby facilitating the identification of the electronic device.
  • an embodiment of the present invention provides a capacitive pen system, a capacitive pen, and a capacitive pen control circuit.
  • an embodiment of the present invention provides a capacitive pen system, where the capacitive pen system includes:
  • the capacitive pen includes an active electrode module, a passive sensing module, a first control module, and a first wireless communication module, the active electrode module includes an active electrode, and the passive sensing module includes a passive electrode;
  • the electronic device includes a touch position detecting module, a second control module, a second wireless communication module, and an operation execution module;
  • the touch position detecting module detects an electrical signal emitted by the active electrode, the second control module determines a position coordinate of a contact point of the active electrode with the electronic device, and controls the operation execution module to perform a writing or clicking operation ;
  • the touch position detecting module detects a touch of the passive electrode
  • the second control module determines a position coordinate of a contact point of the passive electrode and the electronic device
  • the passive sensing module detects a pressure received by the passive electrode
  • the first a control module controls the first wireless communication module to send a pressure detection result to the second wireless communication module, and transmits the result to the second control module, where the second control module controls the location according to the position coordinate and the pressure detection result
  • the operation execution module performs an erase operation.
  • the passive sensing module comprises one of the following pressure sensors: a piezoresistive pressure sensor, a capacitive pressure sensor, an inductive pressure sensor, and a piezoelectric pressure sensor.
  • the first wireless communication module and the second wireless communication module are Bluetooth modules.
  • the first control module is further configured to determine whether the pressure value detected by the passive sensing module is greater than a preset threshold, and when the detected pressure value is greater than a preset threshold, by using the first wireless communication module The electronic device transmits the pressure detection result.
  • the capacitor pen further includes a power supply module
  • the first control module is further configured to determine whether a length of time that the active electrode and the passive electrode are not in contact with the electronic device is greater than a preset threshold, and when the length of the contact is not greater than When the threshold is preset, the power supply module of the first control module is turned off.
  • an embodiment of the present invention provides a capacitive pen applied to an electronic device with a touch panel, including:
  • a pen body an active electrode module mounted on the head of the pen body, a passive sensing module mounted at the tail of the pen body, and a control module and a wireless communication module installed in the inner cavity of the pen body;
  • the active electrode module includes an active electrode for indicating a position on the touch panel
  • the passive sensing module includes a passive electrode for simulating a touch operation of a user's finger, indicating a position on the touch panel, and detecting a pressure received by the passive electrode;
  • the control module controls the wireless communication module to send the pressure detection result acquired by the passive sensing module to the electronic device for controlling the erasing operation of the electronic device.
  • the passive sensing module comprises one of the following pressure sensors: a piezoresistive pressure sensor, a capacitive pressure sensor, an inductive pressure sensor, and a piezoelectric pressure sensor.
  • the wireless communication module is a Bluetooth module.
  • the capacitive pen further includes a power supply module, and the first control module controls opening and closing of the power supply module.
  • the capacitive pen further includes a switch module for controlling opening and closing of the power supply module.
  • the passive sensing module is detachably mounted with the pen body.
  • an embodiment of the present invention provides a capacitive pen control circuit, where the capacitive pen control circuit includes an active electrode circuit unit, a passive sensing circuit unit, a main control circuit unit, and a wireless communication circuit unit, and the main control circuit unit
  • the first input end and the second input end are respectively connected to the output ends of the active electrode circuit unit and the passive sensing circuit unit, and the first output end and the second output end of the main control circuit unit are respectively connected to the active electrode circuit unit
  • the passive sensing circuit unit is configured to output a pressure detection signal and output to the main control circuit unit
  • the main control circuit unit passes the pressure detection signal through the wireless communication circuit unit Sended to an external electronic device to control an erase operation of the electronic device.
  • the passive sensing circuit unit includes a coupled passive electrode and a pressure sensing sub-circuit unit, and an output end of the pressure sensing sub-circuit unit is coupled to the second input end of the main control circuit unit.
  • the wireless communication circuit unit comprises a Bluetooth chip.
  • the capacitive pen control circuit further includes a power supply circuit unit, the power supply circuit unit is connected to the main control circuit unit, and the main control circuit unit sends a control signal to control the power supply circuit unit to supply or disconnect power.
  • the capacitive pen control circuit further includes a switch circuit unit, and the switch circuit unit is connected to the power supply circuit unit to control power supply or power off of the power supply circuit unit.
  • the capacitive pen system and the capacitive pen provided by the embodiment of the present invention by adding a passive sensing module to the end of the capacitive pen, the user can be erased by the detection result of the passive sensing module when the passive electrode contacts the touch panel of the electronic device.
  • the operation intention is to send the erasing operation intention to the electronic device through the wireless communication module, and the electronic device directly performs the erasing operation.
  • the active transmit module reduces structural design, saves product costs, and reduces power consumption.
  • the active electrode circuit unit and the passive sensing circuit unit are controlled by the main control circuit, and the active writing and passive erasing control of the capacitor pen end can be realized, so that the capacitive pen using the circuit does not need to be Additional active electrode emitters can be added to streamline circuit design, saving product cost while reducing power consumption.
  • FIG. 1 is a perspective view of a capacitive pen system according to a first embodiment of the present invention
  • FIG. 2 is a structural block diagram of a capacitive pen system according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic diagram of position detection of an active electrode according to Embodiment 1 of the present invention.
  • FIG. 4 is another structural block diagram of a capacitive pen system according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic perspective view of a capacitive pen according to Embodiment 2 of the present invention.
  • FIG. 6 is a cross-sectional view of a capacitive pen according to Embodiment 2 of the present invention.
  • FIG. 7 is another schematic cross-sectional view of a capacitive pen according to Embodiment 2 of the present invention.
  • FIG. 8 is another schematic cross-sectional view of a capacitive pen according to Embodiment 2 of the present invention.
  • FIG. 9 is another perspective view of a capacitive pen according to Embodiment 2 of the present invention.
  • FIG. 10 is a circuit block diagram of a capacitive pen control circuit according to Embodiment 3 of the present invention.
  • FIG. 11 is a circuit block diagram of an active electrode circuit unit according to Embodiment 3 of the present invention.
  • FIG. 12 is another circuit block diagram of a capacitive pen control circuit according to Embodiment 3 of the present invention.
  • FIG. 13 is still another circuit block diagram of a capacitive pen control circuit according to Embodiment 3 of the present invention.
  • a process, method, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or alternatively Other steps or units inherent to these processes, methods, products, or equipment.
  • references to "an embodiment” herein mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the invention.
  • the appearances of the phrases in various places in the specification are not necessarily referring to the same embodiments, and are not exclusive or alternative embodiments that are mutually exclusive. Those skilled in the art will understand and implicitly understand that the embodiments described herein can be combined with other embodiments.
  • the embodiment of the present invention provides a capacitive pen system, which includes two parts, a capacitive pen 1 and an electronic device 2 .
  • the electronic device 2 is an electronic device with a capacitive touch panel, such as a mobile phone. , ultrabook, tablet, etc.
  • the capacitive pen 1 includes at least an active electrode module 101, a passive sensing module 102, a first control module 103, and a first wireless communication module 104;
  • the electronic device 2 includes a touch position detecting module 201, a second control module 202, a second wireless communication module 203, and an operation executing module 204.
  • the active electrode module 101 is installed at the tip position of the capacitive pen 1
  • the passive electrode module 102 is installed at the end of the capacitive pen 1
  • the first control module 103 and the first wireless communication module 104 are installed.
  • the active electrode module 101 includes an active electrode as a pen tip of the capacitive pen 1 for transmitting an electrical signal
  • the passive sensing module 102 includes a passive electrode for simulating a touch operation of a user's finger.
  • the passive electrode may be mounted in a fixed manner on the end of the capacitive pen 1 or may be attached as a detachable cap. The end position of the capacitive pen 1.
  • the passive sensing module 102 is further configured to detect the pressure received by the passive electrode, and transmit the pressure detection result to the first control module 103 to confirm whether the passive electrode is in contact with the touch panel of the electronic device 2;
  • the passive sensing module 102 includes one of the following pressure sensors: a piezoresistive pressure sensor, a capacitive pressure sensor, an inductive pressure sensor, and a piezoelectric pressure sensor.
  • the pressure sensor used in the passive sensing module 102 is a piezoresistive pressure sensor, specifically a resistance strain gauge pressure sensor, and the resistance strain gauge of the resistance strain gauge pressure sensor is attached to the same.
  • the passive electrode when the passive electrode contacts the electronic device to deform, the resistance strain gauge is deformed accordingly, and the corresponding pressure detection result can be obtained according to the resistance value change of the resistance strain gauge.
  • the pressure sensor used in the passive sensing module 102 is a capacitive pressure sensor, and specifically includes a pressure sensing electrode, and the pressure sensing electrode forms a capacitance with the passive electrode.
  • the passive sensing module 102 will obtain the capacitance value or the capacitance change value of the capacitor, thereby obtaining a corresponding pressure detection result.
  • the passive sensing module 102 may specifically use other types of pressure sensors, such as a semiconductor strain gauge pressure sensor, a piezoresistive pressure sensor, an inductive pressure sensor, and the like.
  • the first control module 103 is configured to control the active electrode module 101 to transmit externally through the active electrode.
  • the electrical signal is used to control the first wireless communication module 104 to transmit the pressure detection result to the second wireless communication module 203 located in the electronic device 2, and then to the second control module 202 located at the electronic device 2.
  • the electronic device 2 includes a touch position detecting module 201, a second control module 202, and a second wireless communication module 203;
  • the touch position detecting module 201 is configured to detect an electrical signal emitted by the active electrode of the active electrode module 101 and detect a touch of the passive electrode of the passive sensing module 102.
  • the touch position detecting module 201 is a touch panel of the electronic device 2 .
  • the schematic diagram of the position detection of the active electrode of the active electrode module 101 on the touch panel is illustrated.
  • the active electrode When the active electrode contacts the touch panel, the active electrode emits an electrical signal to form an electric field.
  • a certain number of horizontal direction detecting electrodes and vertical direction detecting electrodes are distributed on the touch panel, and the horizontal direction detecting electrodes and the vertical direction detecting electrodes are used for detecting the electrical signals emitted by the active electrodes, which are emitted by the active electrodes.
  • the electrical signal will be attenuated during the propagation process. Therefore, the closer the detection electrode is to the active electrode, the stronger the electrical signal strength is detected. As the distance increases, the signal gradually decays. According to this law, in the horizontal direction and the vertical direction.
  • the position coordinates of the active electrode of the active electrode module 101 on the touch panel can be calculated.
  • the passive sensing module 102 when the passive electrode contacts the touch panel, a coupling capacitor is formed between the passive electrode and the conductor layer of the touch panel, and the current generated by the detecting electrode of the touch position detecting module 201 flows to the contact point.
  • the current intensity is proportional to the distance from the passive electrode to the detecting electrode. According to this rule, the position coordinates of the passive electrode of the passive sensing module 102 on the touch panel can be accurately calculated according to the calculated ratio and strength of the current.
  • the second control module 202 is configured to determine position coordinates of a contact point of the active electrode of the active electrode module 101 and the touch panel of the electronic device 2 to control the operation execution module 204 to perform a writing or clicking operation, and Determining the position coordinates of the contact point of the passive electrode of the passive sensing module 102 and the touch panel of the electronic device 2, and simultaneously analyzing the pressure detection result sent from the capacitive pen 1, and controlling the operation according to the obtained position coordinates and the pressure detection result.
  • Execution module 204 performs an erase operation.
  • the second control module 202 is a CPU (Central Processing Unit) module installed in the electronic device.
  • the active electrode module 101 of the capacitive pen 1 can perform a click or write operation, and the passive sensing module 102 of the capacitive pen 1 can perform an erase operation.
  • the active electrode of the active electrode module 101 contacts a touch panel of the electronic device 2;
  • the active electrode module 101 generates an electric field on the surface of the touch panel by transmitting an electrical signal through the active electrode.
  • the touch position detecting module 201 detects an intensity distribution of an electrical signal emitted by the active electrode, and The intensity distribution data of the detected electrical signal is sent to the second control module 202;
  • the second control module 202 calculates a position coordinate of a contact point of the active electrode and the touch panel according to the intensity distribution data of the electrical signal.
  • the second control module 202 controls the operation execution module 204 to perform a writing or clicking operation.
  • the passive electrode of the passive sensing module 102 contacts the touch panel of the electronic device 2;
  • the passive sensing module 102 detects the pressure received by the passive electrode, and transmits the pressure detection result to the first control module 103, and the first control module 103 controls the first wireless communication module 104 to send the pressure detection result to the second.
  • Wireless communication module 203 and transmitted to the second control module 202;
  • the touch position detecting module 201 detects the touch of the passive electrode, and sends the touch detection data to the second control module 202;
  • the second control module 202 calculates a position coordinate of a contact point of the passive electrode and the touch panel according to the touch detection data, and parses the pressure detection result;
  • the second control module 202 controls the operation execution module 204 to perform an erase operation according to the obtained position coordinates and the analysis information of the pressure detection result.
  • the first control module 103 controls the first wireless communication module 104 to send the pressure detection result to the second wireless communication module 203, specifically: the first control module. 103: determining whether the pressure value detected by the passive sensing module 102 is greater than a preset threshold, and when the detected pressure value is greater than a preset threshold, the second wireless communication to the electronic device 2 by the first wireless communication module 104
  • the communication module 203 transmits the pressure detection result.
  • steps S202 and S203 are performed synchronously.
  • the first wireless communication module 104 and the second wireless communication module 203 are both Bluetooth modules.
  • the capacitive pen 1 further includes a power supply module 105
  • the first control module 103 is further configured to determine the active electrode module 101 and the passive sensing module 102 and the electronic device. Whether the duration of the untouched state is greater than a preset threshold, and when the duration of the untouched state is greater than a preset threshold, the first control module 103 controls the power supply module 105 to be turned off.
  • the capacitive pen 1 further includes a switch module 106 for the user to manually control the opening or closing of the power supply module 105.
  • a capacitive pen system is provided by adding a passive sensing module to a tail of a capacitive pen, the passive sensing module including a passive electrode, and when the passive electrode contacts the touch panel of the electronic device, the passive sensing module Detecting the pressure received by the passive electrode, thereby obtaining the user's intention of erasing operation according to the detection result, and transmitting the intention of the erasing operation to the electronic device through the wireless communication module, and the electronic device directly performs the erasing operation, compared with the prior art.
  • the technical solution of the embodiment of the invention does not need to install an active sending module at the end of the capacitive pen, which can simplify the structural design, save product cost, and reduce power consumption.
  • the embodiment of the invention provides a capacitive pen, which is applied to an electronic device with a touch panel, and to the capacitive pen system of the first embodiment.
  • FIG. 5 is a schematic perspective view of the capacitive pen in the embodiment
  • FIG. 6 is a cross-sectional view of the capacitive pen in the embodiment
  • the capacitive pen includes a pen body 3 and is mounted on The active electrode module 301 of the head of the pen body 3, the passive sensing module 302 installed at the tail of the pen body, and the control module 303 and the wireless communication module 304 installed in the inner cavity of the pen body 3;
  • the active electrode module 301 is used to indicate the position of the active electrode 3011 on the touch panel of the electronic device, and the click or write operation can be performed in the electronic device.
  • the active electrode module 301 includes an active electrode 3011, a pressure detecting unit 3012, and a signal generating unit 3013.
  • the pressure detecting unit 3012 detects the active electrode 3011.
  • the control module 303 controls the signal generating unit 3013 to generate an electrical signal and transmits the electrical signal through the active electrode 3011.
  • the electronic device detects the electrical signal, the electronic device can correspondingly Perform a click or write operation.
  • the passive sensing module 302 includes a passive electrode (not shown) for simulating a touch operation of the user's finger, indicating the position of the passive electrode on the touch panel.
  • the passive sensing module 302 can be in the electronic device. Performing an erasing operation, when the passive electrode contacts the touch panel of the electronic device, on the one hand, the passive sensing module 302 detects the pressure received by the passive electrode, and transmits the pressure detection result to the control module 303 to confirm the passive
  • the electrode is in contact with the touch panel of the electronic device, and the control module 303 controls the wireless communication module 304 to transmit the pressure detection result to the electronic device, and the electronic device detects the contact point between the passive electrode and the touch panel of the electronic device.
  • Position coordinates the electronic device performs a corresponding erase operation after receiving the pressure detection result and obtaining the position coordinates.
  • the passive electrode of the passive sensing module can be installed in the pen tail position of the capacitive pen by a fixed manner, or can be sleeved at the end of the pen of the capacitive pen as a detachable cap, FIG. 6 and FIG. Two arrangements of passive electrode sockets of the passive sensing module are shown in FIG.
  • the passive sensing module 302 includes one of the following pressure sensors: a piezoresistive pressure sensor, Capacitive pressure sensor, inductive pressure sensor and piezoelectric pressure sensor.
  • the pressure sensor used in the passive sensing module 302 is a resistance strain gauge pressure sensor, and the resistance strain gauge of the resistance strain gauge pressure sensor is attached to the passive electrode.
  • the passive electrode is displaced or deformed by the pressure, the resistance strain gauge is deformed accordingly, and the corresponding pressure detection result can be obtained according to the resistance value change of the resistance strain gauge.
  • the passive sensing module 302 includes a pressure sensing electrode, and the pressure sensing electrode forms a capacitance with the passive electrode.
  • the passive sensing module 302 will obtain a capacitance value or a capacitance change value of the capacitor, thereby obtaining a corresponding pressure detection result.
  • the passive sensing module 302 can also use other types of pressure sensors, such as a semiconductor strain gauge pressure sensor, a piezoresistive pressure sensor, an inductive pressure sensor, and the like.
  • the wireless communication module 304 is a Bluetooth module.
  • the capacitive pen further includes a power supply module 305 for supplying power to other modules.
  • the The control module 303 controls the power supply module 305 to stop power supply.
  • the capacitive pen further includes a switch module 306 for controlling the opening and closing of the capacitive pen by controlling power supply and power-off of the power supply module 305.
  • the capacitive pen further includes a hook 307.
  • the passive sensing module is included in the end of the capacitive pen, the passive sensing module includes a passive electrode, and the passive sensing module detects the passive electrode when the passive electrode contacts the touch panel of the electronic device.
  • the pressure received by the passive electrode is obtained, so that the user's intention of erasing operation is obtained according to the detection result, and the intention of the erasing operation is transmitted to the electronic device through the wireless communication module, and the electronic device directly performs the erasing operation, compared with the prior art.
  • the technical solution of the embodiment of the invention does not need to install an active transmitting module at the end of the capacitive pen, which can simplify the structural design, save product cost, and reduce power consumption.
  • the embodiment of the invention provides a capacitive pen control circuit, which can be applied to the capacitive pen system of the first embodiment and the capacitive pen of the second embodiment.
  • the capacitive pen control circuit includes an active electrode circuit unit 401, a passive sensing circuit unit 402, a main control circuit unit 403, and a wireless communication circuit unit 404.
  • the first input end and the second input end of the control circuit unit 401 are respectively connected to the output ends of the active electrode circuit unit 401 and the passive sensing circuit unit 402, and the first output end and the second output end of the main control circuit unit 401 Connecting the active electrode circuit unit 401 and the input end of the wireless communication circuit unit 404, respectively, the passive sensing circuit
  • the element 402 is for outputting a pressure detection signal and outputting to the main control circuit unit 403, the main control circuit unit 403 transmitting the pressure detection signal to the external electronic device through the wireless communication circuit unit 404 to control the electronic The device's erase operation.
  • the active electrode circuit unit 401 includes an active electrode 4011, a pressure detecting subunit 4012, and a signal generating subunit 4013.
  • the pressure The detecting sub-unit 4012 detects the pressure of the active electrode 4011.
  • a piezoelectric signal is generated and sent to the main control circuit unit 403, and the main control circuit unit 403 receives the piezoelectric signal and sends a control signal to
  • the signal generating unit 4013 controls the signal generating unit 4013 to generate an electrical signal, and transmits the electrical signal through the active electrode 4011, and when the electronic device detects the electrical signal, the electronic device can perform a click or write operation accordingly.
  • the passive sensing circuit unit 402 includes a coupled passive electrode (not shown) and a pressure sensing sub-circuit unit (not shown), and the output of the pressure sensing sub-circuit unit is connected to the main control circuit unit. a second input end, wherein the passive electrode is used to simulate a touch operation of a user's finger, indicating a position of the passive electrode on the touch panel, and the passive sensing circuit unit 402 can perform an erase operation in the electronic device, Specifically, when the passive electrode contacts the touch panel of the electronic device, the passive sensing circuit unit 402 detects the pressure received by the passive electrode, and transmits the pressure detection result to the main control circuit unit 403 to confirm the passive electrode and The touch panel of the electronic device is in a contact state, and the main control circuit unit 403 sends a control signal to the wireless communication circuit unit 404, and the control wireless communication circuit unit 404 transmits the pressure detection result to the electronic device, so that the electronic device detects Position coordinates of the contact point of the passive electrode and the touch panel of the electronic device,
  • the pressure sensing sub-circuit unit may adopt a specific pressure sensor, and the pressure sensor includes any one of the following: a piezoresistive pressure sensor, a capacitive pressure sensor, an inductive pressure sensor, and a piezoelectric pressure sensor.
  • the pressure sensor used in the pressure sensing sub-circuit unit is a resistance strain gauge pressure sensor, and the resistance strain gauge of the resistance strain gauge pressure sensor is attached to the passive electrode.
  • the passive electrode is displaced or deformed by the pressure, the resistance strain gauge is deformed accordingly, and the corresponding pressure detection result can be obtained according to the resistance value change of the resistance strain gauge.
  • the pressure sensing sub-circuit unit includes a pressure sensing electrode, and the pressure sensing electrode forms a capacitance with the passive electrode, and when the passive electrode is displaced or deformed by pressure The pressure sensing sub-circuit unit will obtain a capacitance value or a capacitance change value of the capacitance, thereby obtaining a corresponding pressure detection result.
  • the pressure sensing sub-circuit unit may also employ other types of pressure sensors, such as a semiconductor strain gauge pressure sensor, a piezoresistive pressure sensor, an inductive pressure sensor, and the like.
  • the capacitive pen control circuit further includes a power supply circuit unit 405, the power supply circuit unit and the active electrode circuit unit, the passive induction circuit unit, the main control circuit unit, and the wireless
  • the communication circuit unit is connected, and the main control circuit unit 403 can send control to the power supply circuit unit 405 to control the power supply or power-off of the power supply circuit unit 405, thereby controlling the opening and closing of the capacitance pen.
  • the capacitive pen control circuit further includes a switch circuit unit 406, and the switch circuit unit 406 controls power supply or power-off of the power supply circuit unit 405, thereby controlling the opening of the capacitive pen and shut down.
  • the main control circuit includes a control chip
  • the wireless communication circuit module includes a Bluetooth chip
  • the wireless communication circuit unit can be replaced by a wired communication circuit unit.
  • the passive sensing module is detachably mounted to the pen body or partially detachably mounted.
  • the passive sensing module may include a separate wireless communication unit for communicating with the main control circuit of the active pen or the main control circuit of the touch screen device in addition to the pressure detector. The pressure signal for erasing the intent is transmitted, in which case the passive sensing module acts as an electronic eraser that is separate from the capacitive pen.
  • the active electrode circuit unit and the passive sensing circuit unit are controlled by the main control circuit, and the active writing and passive erasing control of the capacitor pen end can be realized, so that the capacitive pen using the circuit does not need to be Additional active electrode emitters can be added to streamline circuit design, saving product cost while reducing power consumption.

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Abstract

一种电容笔***、电容笔及电容笔控制电路，所述电容笔***包括：一电容笔（1）和一电子设备（2）；其中，所述电容笔（1）包括主动电极模块（101）、被动感应模块（102）、第一控制模块（103）和第一无线通信模块（104），所述主动电极模块（101）包括一主动电极，所述被动感应模块（102）包括一被动电极；所述电子设备（2）包括一触摸位置检测模块（201）、第二控制模块（202）、第二无线通信模块（203）和操作执行模块（204）。通过在电容笔（1）的笔尾增加被动感应模块（102），可以在电容笔端得到用户的擦除操作意图，并通过无线通信模块（104）将擦除操作意图发送给电子设备（2），执行擦除操作，不需要在电容笔（1）的笔尾装设主动发送模块，可以精简结构设计、节省产品成本，同时降低功耗。

Description

一种电容笔***、电容笔及电容笔控制电路 技术领域
本发明实施例属于电容笔领域，尤其涉及一种电容笔***、电容笔及电容笔控制电路。
背景技术
主动式电容笔作为带触摸屏的电子设备的主要外设输入配件，逐渐受到市场的关注。通常用户在使用主动式电容笔的过程中，除了正常书写新内容，也会有擦除已有内容的需求。
当前市场上主动式电容笔的擦除功能实现方式主要有两种：
第一种方式是基于电子设备端的软件实现，这种情况下，主动式电容笔仅通过笔尖发射信号，主动式电容笔和电子设备均无法通过笔尖信号来识别用户当前意图是书写或是擦除，在主动式电容笔的笔尖信号默认为书写模式的情况下，如果有擦除需求，需要通过电子设备端的软件设置将书写模式切换为擦除模式，此时主动式电容笔的笔尖信号用于进行擦除操作，擦除完成后，再切换到正常的书写模式。这种实现方法不需要主动式电容笔做特殊处理，通用型主动式电容笔都可以支持，但操作过程中需要手动切换模式，影响用户体验。
第二种方式是主动式电容笔端先识别出用户擦除行为意图，这种情况下，主动式电容笔仅的笔尖和笔尾均能发射信号，其中笔尾信号有别于笔尖信号，电子设备通过笔尾信号和笔尖信号的特征识别出是书写信号还是擦除信号；一种典型的方式是采用在笔尖与笔尾各设计一个发射电极分别实现书写和擦除功能，正常书写时，电子设备检测的是笔尖信号，当用户将笔身倒置用笔尾接触电子设备屏幕使用擦除功能时，电子设备检测的是笔尾信号，笔尖电极和笔帽电极发射信号的频率不同，从而方便电子设备识别用户的书写或者擦除行为意图。这种方式由于在主动式电容笔上设置两个信号发射端，将增加功耗和产品成本。
发明内容
为了解决上述问题，本发明实施例提供一种电容笔***、电容笔及电容笔控制电路。
第一方面，本发明实施例提供一种电容笔***，所述电容笔***包括：
一电容笔和一电子设备；
其中，所述电容笔包括主动电极模块、被动感应模块、第一控制模块和第一无线通信模块，所述主动电极模块包括一主动电极，所述被动感应模块包括一被动电极；
所述电子设备包括一触摸位置检测模块、第二控制模块、第二无线通信模块和操作执行模块；
所述触摸位置检测模块检测所述主动电极发射的电信号，所述第二控制模块确定所述主动电极与所述电子设备接触点的位置坐标，并控制所述操作执行模块执行书写或点击操作；
所述触摸位置检测模块检测被动电极的触摸，由所述第二控制模块确定被动电极与所述电子设备接触点的位置坐标，所述被动感应模块检测所述被动电极受到的压力，所述第一控制模块控制所述第一无线通信模块将压力检测结果发送至第二无线通信模块，并传输给所述第二控制模块，所述第二控制模块根据所述位置坐标和压力检测结果控制所述操作执行模块执行擦除操作。
可选地，所述被动感应模块包括如下压力传感器中的一种：压阻式压力传感器、电容式压力传感器、电感式压力传感器和压电式压力传感器。
可选地，所述第一无线通信模块和第二无线通信模块为蓝牙模块。
进一步地，所述第一控制模块还用于判断所述被动感应模块检测到的压力值是否大于预设阈值，当检测到的压力值大于预设阈值时，通过所述第一无线通信模块向所述电子设备发送所述压力检测结果。
进一步地，所述电容笔还包括供电模块，所述第一控制模块还用于判断所述主动电极和被动电极与所述电子设备未接触的时长是否大于预设阈值，当未接触的时长大于预设阈值时，所述第一控制模块所述供电模块关闭。
第二方面，本发明实施例提供一种电容笔，应用于带触摸面板的电子设备，包括：
笔主体，安装在笔主体头部的主动电极模块，安装在笔主体尾部的被动感应模块，以及安装在笔主体内腔的控制模块、无线通信模块；
所述主动电极模块包括一主动电极，所述主动电极用于指示在触摸面板上的位置；
所述被动感应模块包括一被动电极，用于模拟用户手指的触摸操作，指示在触摸面板上的位置，以及检测所述被动电极受到的压力；
所述控制模块控制无线通信模块将所述被动感应模块获取的压力检测结果发送给电子设备用于控制所述电子设备的擦除操作。
可选地，所述被动感应模块包括如下压力传感器中的一种：压阻式压力传感器、电容式压力传感器、电感式压力传感器和压电式压力传感器。
可选地，所述无线通信模块为蓝牙模块。
进一步地，所述电容笔还包括供电模块，所述第一控制模块控制所述供电模块的开启和关闭。
进一步地，所述电容笔还包括一开关模块，用于控制所述供电模块的开启和关闭。
进一步地，所述被动感应模块与所述笔主体可拆卸式安装。
第三方面，本发明实施例提供一种电容笔控制电路，所述电容笔控制电路包括主动电极电路单元、被动感应电路单元、主控电路单元、无线通信电路单元，所述主控电路单元的第一输入端和第二输入端分别连接所述主动电极电路单元和被动感应电路单元的输出端，所述主控电路单元的第一输出端和第二输出端分别连接所述主动电极电路单元和无线通信电路单元的输入端，所述被动感应电路单元用于输出压力检测信号并输出至所述主控电路单元，所述主控电路单元将所述压力检测信号通过所述无线通信电路单元发送至外部电子设备以控制所述电子设备的擦除操作。
进一步地，所述被动感应电路单元包括耦合的一被动电极和一压力感应子电路单元，所述压力感应子电路单元的输出端连接所述主控电路单元的第二输入端。
可选的，所述无线通信电路单元包括一蓝牙芯片。
进一步地，所述电容笔控制电路还包括一供电电路单元，所述供电电路单元与主控电路单元连接，所述主控电路单元发送控制信号控制所述供电电路单元供电或断电。
进一步地，所述电容笔控制电路还包括一开关电路单元，所述开关电路单元与所述供电电路单元连接，控制所述供电电路单元的供电或断电。
根据本发明实施例提供的电容笔***和电容笔，通过在电容笔的笔尾增加被动感应模块，可以在被动电极接触电子设备的触摸面板时，通过被动感应模块的检测结果得到用户的擦除操作意图，并通过无线通信模块将擦除操作意图发送给电子设备，电子设备直接执行擦除操作，与现有技术相比，本发明实施例的技术方案不需要在电容笔的笔尾装设主动发送模块，可以精简结构设计、节省产品成本，同时降低功耗。根据本发明实施例提供的电容笔控制电路，通过主控电路控制主动电极电路单元和被动感应电路单元，可实现电容笔端的主动书写、被动擦除的控制，使得采用该电路的电容笔不需要增设额外的主动电极发射电路，可以精简电路结构设计，节省产品成本，同时降低功耗。
附图说明
为了更清楚地说明本发明或现有技术中的方案，下面将对实施例或现有技术描述中所需要使用的附图作一个简单介绍，显而易见地，下面描述中的附图是本发明的一些实施例， 对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例一提供的电容笔***的立体示意图；
图2为本发明实施例一提供的电容笔***的结构框图；
图3为本发明实施例一提供的主动电极的位置检测的示意图；
图4为本发明实施例一提供的电容笔***的另一结构框图；
图5为本发明实施例二提供的电容笔的立体示意图；
图6为本发明实施例二提供的电容笔的剖视示意图；
图7为本发明实施例二提供的电容笔的另一剖视示意图；
图8为本发明实施例二提供的电容笔的又一剖视示意图；
图9为本发明实施例二提供的电容笔的另一立体示意图；
图10为本发明实施例三提供的电容笔控制电路的电路框图；
图11为本发明实施例三提供的主动电极电路单元的电路框图；
图12为本发明实施例三提供的电容笔控制电路的另一电路框图；
图13为本发明实施例三提供的电容笔控制电路的又一电路框图。
具体实施方式
为了使本技术领域的人员更好地理解本发明方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本发明。本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、***、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其他步骤或单元。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本发明的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
实施例一
参阅图1和图2。本发明实施例提供一种电容笔***，所述电容笔***包括电容笔1和电子设备2两部分，在本实施例中，所述电子设备2为带电容式触摸面板的电子设备，比如手机、超极本、平板等。
其中，所述电容笔1至少包括主动电极模块101、被动感应模块102、第一控制模块103和第一无线通信模块104；
所述电子设备2包括一触摸位置检测模块201、第二控制模块202、第二无线通信模块203和操作执行模块204。
具体的，所述主动电极模块101安装在电容笔1的笔头位置，所述被动电极模块102安装在电容笔1的笔尾位置，所述第一控制模块103和第一无线通信模块104均安装在电容笔1的笔身内。
在本实施例中，所述主动电极模块101包括一主动电极，作为电容笔1的笔尖，用于发送电信号；
所述被动感应模块102包括一被动电极，用于模拟用户手指的触摸操作，所述被动电极可以通过固定的方式安装在电容笔1的笔尾位置，也可以是作为可拆卸的笔帽套接在电容笔1的笔尾位置。
所述被动感应模块102还用于检测所述被动电极受到的压力，同时将压力检测结果传输至所述第一控制模块103，以确认被动电极与电子设备2的触摸面板是否接触；
可选地，所述被动感应模块102包括如下压力传感器中的一种：压阻式压力传感器、电容式压力传感器、电感式压力传感器和压电式压力传感器。
在本实施例的一种方案中，所述被动感应模块102采用的压力传感器为压阻式压力传感器，具体为电阻应变片压力传感器，所述电阻应变片压力传感器的电阻应变片贴合在所述被动电极上，当被动电极接触电子设备发生形变时，电阻应变片相应地发生形变，根据电阻应变片的电阻值变化可获得相应的压力检测结果。
在本实施例的另一种方案中，所述被动感应模块102采用的压力传感器为电容式压力传感器，具体还包括一压力传感电极，所述压力传感电极与被动电极形成一电容，当所述被动电极受到压力发生位移或者形变时，所述被动感应模块102将获得所述电容的电容值或者电容变化值，从而获得相应的压力检测结果。
可选的，在本实施例的其他方案中，所述被动感应模块102具体还可以采用其他类型的压力传感器，比如半导体应变片压力传感器、压阻式压力传感器、电感式压力传感器等。
所述第一控制模块103一方面用于控制所述主动电极模块101通过主动电极对外发射 电信号，另一方面用于控制第一无线通信模块104将压力检测结果发送至位于电子设备2的第二无线通信模块203，继而传输给位于电子设备2的第二控制模块202。
所述电子设备2包括一触摸位置检测模块201、第二控制模块202和第二无线通信模块203；
所述触摸位置检测模块201用于检测主动电极模块101的主动电极发射的电信号和检测被动感应模块102的被动电极的触摸。
具体的，所述触摸位置检测模块201为电子设备2的触摸面板。
对于主动电极模块101而言，如图3所示，图示为主动电极模块101的主动电极在触摸面板上的位置检测示意图，在主动电极接触触摸面板时，主动电极发射出电信号形成一电场，而触摸面板上分布着一定数量的水平方向检测电极和竖直方向检测电极，水平方向检测电极和竖直方向检测电极用来对主动电极发射出来的电信号进行检测，由于主动电极发射出的电信号在传播的过程中会有衰减，因此离主动电极越近的检测电极检测到的电信号强度越大，随着距离的增加，信号逐渐衰减，根据此规律，在水平方向和竖直方向都可以计算出主动电极模块101的主动电极在触摸面板上的位置坐标。
对于被动感应模块102而言，在被动电极接触触摸面板时，被动电极与触摸面板的导体层之间会形成一个耦合电容，所述触摸位置检测模块201的检测电极发出的电流会流向接触点，而电流强弱与被动电极到检测电极的距离成正比，根据此规律，可根据计算出的电流的比例及强弱来准确算出被动感应模块102的被动电极在触摸面板上的位置坐标。
所述第二控制模块202用于确定主动电极模块101的主动电极与所述电子设备2的触摸面板的接触点的位置坐标，以控制所述操作执行模块204执行书写或点击操作，以及用于确定被动感应模块102的被动电极与所述电子设备2的触摸面板的接触点的位置坐标，同时解析从电容笔1发送过来的压力检测结果，根据得到的位置坐标和压力检测结果控制所述操作执行模块204执行擦除操作。具体的，所述第二控制模块202为安装在电子设备中的CPU(Central Processing Unit，中央处理器)模块。
在上述电容笔***中，通过电容笔1的主动电极模块101可进行点击或者书写操作，通过电容笔1的被动感应模块102可进行擦除操作，下面具体对电容笔***的工作过程进行说明。
其中，通过电容笔1的主动电极模块101进行书写或者点击操作时，其工作过程如下：
S101、所述主动电极模块101的主动电极接触电子设备2的触摸面板；
S102、所述主动电极模块101通过主动电极发射电信号，在触摸面板表面形成一电场；
S103、所述触摸位置检测模块201检测所述主动电极发射的电信号的强度分布，并将 检测到的电信号的强度分布数据发送至第二控制模块202；
S104、所述第二控制模块202根据电信号的强度分布数据计算所述主动电极与所述触摸面板的接触点的位置坐标；
S105、所述第二控制模块202控制所述操作执行模块204执行书写或点击操作。
另一方面，通过电容笔1的被动感应模块102进行擦除操作时，其工作过程如下：
S201、所述被动感应模块102的被动电极接触电子设备2的触摸面板；
S202、所述被动感应模块102检测所述被动电极受到的压力，并将压力检测结果传输至第一控制模块103，第一控制模块103控制第一无线通信模块104将压力检测结果发送至第二无线通信模块203，并传输给所述第二控制模块202；
S203、所述触摸位置检测模块201检测被动电极的触摸，并将触摸检测数据发送至第二控制模块202；
S204、所述第二控制模块202根据触摸检测数据计算被动电极与所述触控面板的接触点的位置坐标，并解析所述压力检测结果；
S205、所述第二控制模块202根据得到的位置坐标和压力检测结果的解析信息控制所述操作执行模块204执行擦除操作。
作为本发明实施例的可选方案，在步骤S202中，所述第一控制模块103控制第一无线通信模块104将压力检测结果发送至第二无线通信模块203具体为：所述第一控制模块103判断所述被动感应模块102检测到的压力值是否大于预设阈值，当检测到的压力值大于预设阈值时，通过所述第一无线通信模块104向所述电子设备2的第二无线通信模块203发送所述压力检测结果。
可选的，上述步骤S202和S203同步进行。
可选地，在本实施例中，上述第一无线通信模块104和第二无线通信模块203均为蓝牙模块。
在本实施例中，如图4所示，所述电容笔1还包括供电模块105，所述第一控制模块103还用于判断所述主动电极模块101和被动感应模块102与所述电子设备2处于未接触状态的时长是否大于预设阈值，当处于未接触状态的时长大于预设阈值时，所述第一控制模块103控制所述供电模块105关闭。
可选的，所述电容笔1还包括开关模块106，用于用户手动控制供电模块105的开启或关闭。
根据本发明实施例提供的电容笔***，通过在电容笔的笔尾增加被动感应模块，该被动感应模块包括一被动电极，当被动电极接触电子设备的触摸面板时，该被动感应模块将 检测所述被动电极受到的压力，从而根据检测结果得到用户的擦除操作意图，并通过无线通信模块将擦除操作意图发送给电子设备，电子设备直接执行擦除操作，与现有技术相比，本发明实施例的技术方案不需要在电容笔的笔尾装设主动发送模块，可以精简结构设计、节省产品成本，同时降低功耗。
实施例二
本发明实施例提供一种电容笔，应用于带触摸面板的电子设备，以及应用于实施例一所述电容笔***。
参阅图5和图6，其中图5所示为本实施例中电容笔的立体示意图，图6所示为本实施例中电容笔的剖视示意图，所述电容笔包括笔主体3，安装在笔主体3头部的主动电极模块301，安装在笔主体尾部的被动感应模块302，以及安装在笔主体3内腔的控制模块303、无线通信模块304；
在本实施例中，所述主动电极模块301用于指示主动电极3011在电子设备的触摸面板上的位置，可在电子设备中进行点击或者书写的操作。具体的，所述主动电极模块301包括主动电极3011、压力检测单元3012和信号发生单元3013，在所述主动电极3011接触电子设备的触摸面板时，所述压力检测单元3012检测所述主动电极3011的压力，在检测到压力时，所述控制模块303控制所述信号发生单元3013产生电信号，并通过所述主动电极3011发射该电信号，电子设备在检测到该电信号时，可相应地执行点击或者书写操作。
所述被动感应模块302包括被动电极(图中未标识)，用于模拟用户手指的触摸操作，指示被动电极在触摸面板上的位置，具体的，通过所述被动感应模块302可在电子设备中进行擦除的操作，当被动电极接触电子设备的触摸面板时，一方面所述被动感应模块302检测所述被动电极受到的压力，并将压力检测结果传输至所述控制模块303，以确认被动电极与电子设备的触摸面板处于接触状态，同时所述控制模块303控制无线通信模块304将所述压力检测结果发送至电子设备，另一方面电子设备检测被动电极与电子设备触摸面板的接触点的位置坐标，电子设备在接收到压力检测结果和得到位置坐标后执行相应的擦除操作。
在本实施例中，所述被动感应模块的被动电极可以通过固定的方式安装在电容笔的笔尾位置，也可以是作为可拆卸的笔帽套接在电容笔的笔尾位置，图6和图7中示出了所述被动感应模块的被动电极套接的两种设置方式。
可选地，所述被动感应模块302包括如下压力传感器中的一种：压阻式压力传感器、 电容式压力传感器、电感式压力传感器和压电式压力传感器。
在本实施例的一种方案中，所述被动感应模块302采用的压力传感器为电阻应变片压力传感器，所述电阻应变片压力传感器的电阻应变片贴合在所述被动电极上。当所述被动电极受到压力发生位移或者形变时，电阻应变片相应地发生形变，根据电阻应变片的电阻值变化可获得相应的压力检测结果。
在本实施例的另一种方案中，所述被动感应模块302包括一压力传感电极，所述压力传感电极与被动电极形成一电容，当所述被动电极受到压力发生位移或者形变时，所述被动感应模块302将获得所述电容的电容值或者电容变化值，从而获得相应的压力检测结果。
在本实施例的其他方案中，所述被动感应模块302还可以采用其他类型的压力传感器，比如半导体应变片压力传感器、压阻式压力传感器、电感式压力传感器等
在本实施例中，所述无线通信模块304为蓝牙模块。
在本实施例中，如图8所示，所述电容笔还包括供电模块305，用于为其他模块供电，可选的，当电容笔处于未使用状态的时间超过预设时长时，所述控制模块303控制供电模块305停止供电。
可选地，如图9所示，所述电容笔还包括一开关模块306，通过控制所供电模块305的供电和断电来控制电容笔的开启和关闭。可选的，所述电容笔还包括一挂钩307。
根据本发明实施例提供的电容笔，通过在电容笔的笔尾增加被动感应模块，所述被动感应模块包括一被动电极，在被动电极接触电子设备的触摸面板时，该被动感应模块将检测所述被动电极受到的压力，从而根据检测结果得到用户的擦除操作意图，并通过无线通信模块将擦除操作意图发送给电子设备，电子设备直接执行擦除操作，与现有技术相比，本发明实施例的技术方案不需要在电容笔的笔尾装设主动发送模块，可以精简结构设计、节省产品成本，同时降低功耗。
实施例三
本发明实施例提供一种电容笔控制电路，可应用于实施例一所述的电容笔***和实施例二所述的电容笔。
参阅图10所示的电容笔控制电路的结构框图，所述电容笔控制电路包括主动电极电路单元401，被动感应电路单元402、主控电路单元403、无线通信电路单元404；其中，所述主控电路单元401的第一输入端和第二输入端分别连接所述主动电极电路单元401和被动感应电路单元402的输出端，所述主控电路单元401的第一输出端和第二输出端分别连接所述主动电极电路单元401和无线通信电路单元404的输入端，所述被动感应电路单 元402用于输出压力检测信号并输出至所述主控电路单元403，所述主控电路单元403将所述压力检测信号通过所述无线通信电路单元404发送至外部电子设备以控制所述电子设备的擦除操作。
具体的，如图11所示，所述主动电极电路单元401包括主动电极4011、压力检测子单元4012和信号发生子单元4013，在所述主动电极4011接触电子设备的触摸面板时，所述压力检测子单元4012检测所述主动电极4011的压力，在检测到压力时，生成压电信号并发送给所述主控电路单元403，所述主控电路单元403接收压电信号后发送控制信号至所述信号发生单元4013，控制所述信号发生单元4013产生电信号，并通过所述主动电极4011发射该电信号，电子设备在检测到该电信号时，可相应地执行点击或者书写操作。
所述被动感应电路单元402包括耦合的一被动电极(图中未标识)和一压力感应子电路单元(图中未标识)，所述压力感应子电路单元的输出端连接所述主控电路单元的第二输入端，其中，所述被动电极用于模拟用户手指的触摸操作，指示被动电极在触摸面板上的位置，通过所述被动感应电路单元402可在电子设备中进行擦除的操作，具体的，当被动电极接触电子设备的触摸面板时，所述被动感应电路单元402检测所述被动电极受到的压力，并将压力检测结果传输至所述主控电路单元403，以确认被动电极与电子设备的触摸面板处于接触状态，同时所述主控电路单元403发送控制信号至无线通信电路单元404，控制无线通信电路单元404将所述压力检测结果发送至电子设备，从而电子设备在检测到被动电极与电子设备触摸面板的接触点的位置坐标，以及接收到压力检测结果后，执行相应的擦除操作。
所述压力感应子电路单元可采用具体的压力传感器，所述压力传感器包括如下的任意一种：压阻式压力传感器、电容式压力传感器、电感式压力传感器和压电式压力传感器。
在本实施例的一种方案中，所述压力感应子电路单元采用的压力传感器为电阻应变片压力传感器，所述电阻应变片压力传感器的电阻应变片贴合在所述被动电极上。当所述被动电极受到压力发生位移或者形变时，电阻应变片相应地发生形变，根据电阻应变片的电阻值变化可获得相应的压力检测结果。
在本实施例的另一种方案中，所述压力感应子电路单元包括一压力传感电极，所述压力传感电极与被动电极形成一电容，当所述被动电极受到压力发生位移或者形变时，所述压力感应子电路单元将获得所述电容的电容值或者电容变化值，从而获得相应的压力检测结果。
在本实施例的其他方案中，所述压力感应子电路单元还可以采用其他类型的压力传感器，比如半导体应变片压力传感器、压阻式压力传感器、电感式压力传感器等。
在本实施例中，如图12所示，所述电容笔控制电路还包括供电电路单元405，所述供电电路单元分别与所述主动电极电路单元，被动感应电路单元、主控电路单元、无线通信电路单元连接，所述主控电路单元403可发送控制至供电电路单元405，控制供电电路单元405的供电或断电，从而可控制电容笔的开启和关闭。
可选地，如图13所示，，所述电容笔控制电路还包括一开关电路单元406，所述开关电路单元406控制供电电路单元405的供电或断电，从而可控制电容笔的开启和关闭。
在本实施例中，所述主控电路包括一控制芯片，所述无线通信电路模块包括一蓝牙芯片。
在一些其他例子中，无线通信电路单元可被有线通信电路单元所取代。
在另外的实施例中，所述被动感应模块与所述笔主体可拆卸式安装，或者部分可拆卸安装。在一个例子中，所述被动感应模块除了包括压力检测器之外，还可以包括单独的无线通信单元用于与主动笔的主控电路或触控屏设备的主控电路进行通信，以便将代表擦除意图的压力信号传递出去，这种情况下，被动感应模块可作为一个与电容笔相分离的电子橡皮擦。
根据本发明实施例提供的电容笔控制电路，通过主控电路控制主动电极电路单元和被动感应电路单元，可实现电容笔端的主动书写、被动擦除的控制，使得采用该电路的电容笔不需要增设额外的主动电极发射电路，可以精简电路结构设计，节省产品成本，同时降低功耗。
显然，以上所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例,附图中给出了本发明的较佳实施例，但并不限制本发明的专利范围。本发明可以以许多不同的形式来实现，相反地，提供这些实施例的目的是使对本发明的公开内容的理解更加透彻全面。尽管参照前述实施例对本发明进行了详细的说明，对于本领域的技术人员来而言，其依然可以对前述各具体实施方式所记载的技术方案进行修改，或者对其中部分技术特征进行等效替换。凡是利用本发明说明书及附图内容所做的等效结构，直接或间接运用在其他相关的技术领域，均同理在本发明专利保护范围之内。

Claims (16)

  1. 一种电容笔***，其特征在于，所述电容笔***包括：
    一电容笔和一电子设备；
    其中，所述电容笔包括主动电极模块、被动感应模块、第一控制模块和第一无线通信模块，所述主动电极模块包括一主动电极，所述被动感应模块包括一被动电极；
    所述电子设备包括一触摸位置检测模块、第二控制模块、第二无线通信模块和操作执行模块；
    所述触摸位置检测模块检测所述主动电极发射的电信号，所述第二控制模块确定所述主动电极与所述电子设备接触点的位置坐标，并控制所述操作执行模块执行书写或点击操作；
    所述触摸位置检测模块检测被动电极的触摸，由所述第二控制模块确定被动电极与所述电子设备接触点的位置坐标，所述被动感应模块检测所述被动电极受到的压力，所述第一控制模块控制所述第一无线通信模块将压力检测结果发送至第二无线通信模块，并传输给所述第二控制模块，所述第二控制模块根据所述位置坐标和压力检测结果控制所述操作执行模块执行擦除操作。
  2. 根据权利要求1所述的电容笔***，其特征在于，所述被动感应模块包括如下压力传感器中的一种：压阻式压力传感器、电容式压力传感器、电感式压力传感器和压电式压力传感器。
  3. 根据权利要求1任一项所述的电容笔***，其特征在于，所述第一无线通信模块和第二无线通信模块为蓝牙模块。
  4. 根据权利要求1-3任一项所述的电容笔***，其特征在于，所述第一控制模块还用于判断所述被动感应模块检测到的压力值是否大于预设阈值，当检测到的压力值大于预设阈值时，通过所述第一无线通信模块向所述电子设备发送所述压力检测结果。
  5. 根据权利要求1-3任一项所述的电容笔***，其特征在于，所述电容笔还包括供电模块，所述第一控制模块还用于判断所述主动电极和被动电极与所述电子设备未接触的时长是否大于预设阈值，当未接触的时长大于预设阈值时，所述第一控制模块所述供电模块关闭。
  6. 一种电容笔，应用于带触摸面板的电子设备，其特征在于，包括：笔主体，安装在笔主体头部的主动电极模块，安装在笔主体尾部的被动感应模块，以及安装在笔主体内腔的控制模块、无线通信模块；
    所述主动电极模块包括一主动电极，所述主动电极用于指示在触摸面板上的位置；
    所述被动感应模块包括一被动电极，用于模拟用户手指的触摸操作，指示在触摸面板 上的位置，以及检测所述被动电极受到的压力；
    所述控制模块控制无线通信模块将所述被动感应模块获取的压力检测结果发送给电子设备用于控制所述电子设备的擦除操作。
  7. 根据权利要求6所述的电容笔，其特征在于，所述被动感应模块包括如下压力传感器中的一种：压阻式压力传感器、电容式压力传感器、电感式压力传感器和压电式压力传感器。
  8. 根据权利要求6所述的电容笔，其特征在于，所述无线通信模块为蓝牙模块。
  9. 根据权利要求6-8任一项所述的电容笔，其特征在于，所述电容笔还包括供电模块，所述第一控制模块控制所述供电模块的开启和关闭。
  10. 根据权利要求9的电容笔，其特征在于，所述电容笔还包括一开关模块，用于控制所述供电模块的开启和关闭。
  11. 根据权利要求6的电容笔，其特征在于，所述被动感应模块与所述笔主体可拆卸式安装。
  12. 一种电容笔控制电路，其特征在于，所述电容笔控制电路包括主动电极电路单元、被动感应电路单元、主控电路单元、无线通信电路单元，所述主控电路单元的第一输入端和第二输入端分别连接所述主动电极电路单元和被动感应电路单元的输出端，所述主控电路单元的第一输出端和第二输出端分别连接所述主动电极电路单元和无线通信电路单元的输入端，所述被动感应电路单元用于输出压力检测信号并输出至所述主控电路单元，所述主控电路单元将所述压力检测信号通过所述无线通信电路单元发送至外部电子设备以控制所述电子设备的擦除操作。
  13. 根据权利要求12所述的电容笔控制电路，其特征在于，所述被动感应电路单元包括耦合的一被动电极和一压力感应子电路单元，所述压力感应子电路单元的输出端连接所述主控电路单元的第二输入端。
  14. 根据权利要求12所述的电容笔控制电路，其特征在于，所述无线通信电路单元包括一蓝牙芯片。
  15. 根据权利要求12-14任一项所述的电容笔控制电路，其特征在于，所述电容笔控制电路还包括一供电电路单元，所述供电电路单元与主控电路单元连接，所述主控电路单元发送控制信号控制所述供电电路单元供电或断电。
  16. 根据权利要求15所述的电容笔控制电路，其特征在于，所述电容笔控制电路还包括一开关电路单元，所述开关电路单元与所述供电电路单元连接，控制所述供电电路单元的供电或断电。
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