CN102221911A - Touch electronic pen - Google Patents

Abstract

The invention discloses a touch electronic pen, which belongs to the field of electronic technology. The touch electronic pen includes a housing, a pen head, a piezoelectric ceramic group, a drive module, and a circuit part for processing the voltage signal generated by the piezoelectric ceramic group and outputting it to the drive module. Elastically connected to one end of the housing, the housing and the pen head are provided with a clamping structure for clamping the piezoelectric ceramic group, the driving module is fixed in the pen head and includes a discharge tip, the One end of the nib is provided with a through groove, and the discharge tip is located in the through groove. The touch electronic pen provided by the embodiment of the present invention can directly control the imaging of the electronic blackboard or electronic whiteboard, and the imaging reaction time is short; and the matching electronic blackboard or electronic whiteboard does not need a sensing positioning layer to obtain the writing track, and has a simple structure and low cost.

Description

touch electronic pen

technical field

The invention relates to the field of electronic technology, in particular to a touch electronic pen.

Background technique

With the development of science and technology, the teaching aids in daily teaching show a trend of being electronic. The existing electronic teaching aids usually include electronic blackboards or electronic whiteboards, and their matching electronic pens. Existing electronic blackboards or electronic whiteboards usually include a sensing positioning layer, a display layer and a control circuit. When the electronic pen writes on the electronic black and white or electronic whiteboard, the electronic black and white or electronic whiteboard captures the trajectory of the electronic pen through the induction positioning layer, and then controls the display layer to display the content written by the electronic pen through the control circuit. magnetic induction layer.

There is an electronic pen in the prior art, which includes a casing, a pen tip arranged at one end of the casing, a power supply, a physical switch, a boost circuit and an electromagnetic oscillation circuit. The touch switch of the electromagnetic oscillating circuit is connected with the pen tip. When writing, the touch switch is in direct contact with the electronic blackboard or electronic whiteboard, and the pen tip is pressed to open the electromagnetic oscillation circuit, thereby generating a changing magnetic field; the electronic blackboard or electronic whiteboard uses electromagnetic induction to locate and display the corresponding track.

In the process of realizing the present invention, the inventor found that the prior art has the following problems:

When using the existing electronic pen to write on the electronic blackboard or electronic whiteboard, the electronic blackboard or electronic whiteboard must first obtain the writing track through the induction positioning layer, and then control the imaging of the display layer, and the imaging response speed is slow. Moreover, since the induction positioning layer needs to be provided, the manufacturing cost of the electronic blackboard and the electronic whiteboard increases.

Contents of the invention

In order to shorten the imaging reaction time and reduce the cost of a matching electronic black and white or electronic whiteboard, an embodiment of the present invention provides a touch electronic pen. Described technical scheme is as follows:

A touch electronic pen, comprising a casing, a pen head, a piezoelectric ceramic group, a drive module, and a circuit part for processing a voltage signal generated by the piezoelectric ceramic group and outputting it to the drive module, and the pen head can It is telescopically and elastically connected to one end of the housing, the housing and the pen head are correspondingly provided with a clamping structure for clamping the piezoelectric ceramic group, the driving module is fixed in the pen head and includes a discharge tip , one end of the nib is provided with a through groove, and the discharge tip is located in the through groove.

The beneficial effect brought by the technical solution provided by the embodiment of the present invention is: the embodiment of the present invention outputs the voltage signal generated by the deformation of the piezoelectric ceramic group to the drive module after processing, and generates a strong electric field through the discharge tip, so that it can directly control Electronic blackboard or electronic whiteboard imaging, imaging reaction time is short; and electronic blackboard or electronic whiteboard does not need induction positioning layer to obtain writing track, simple structure and low cost.

Description of drawings

FIG. 1 is a schematic structural diagram of a touch electronic pen provided in Embodiment 1 of the present invention;

Fig. 2 is a schematic structural diagram of a touch electronic pen provided in Embodiment 2 of the present invention;

3 is a schematic structural diagram of the circuit part of the touch electronic pen provided in Embodiment 2 of the present invention;

4 is a circuit diagram of a piezoelectric sensor module in the touch electronic pen provided in Embodiment 2 of the present invention;

5 is a circuit diagram of a voltage multiplication module in the touch electronic pen provided in Embodiment 2 of the present invention;

6 is a schematic structural diagram of a drive module in a touch electronic pen provided in Embodiment 2 of the present invention;

FIG. 7 is a schematic side view of the drive module in the touch electronic pen provided in Embodiment 2 of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Example 1

Referring to FIG. 1 , this embodiment provides a touch electronic pen, including a housing 101, a pen tip 102, a piezoelectric ceramic group 103, a drive module 104, and a voltage signal for processing the voltage signal generated by the piezoelectric ceramic group 103 and outputting it to The circuit portion 105 of the drive module 104 . The nib 102 is stretchably and elastically connected to one end of the casing 101. The casing 101 and the nib 102 are correspondingly provided with a clamping structure for clamping the piezoelectric ceramic group 103. The driving module 104 is fixed in the nib 102 and includes a discharge tip 106, the nib One end of 102 is provided with a through groove, and the discharge tip 106 is located in the through groove.

Further, referring to FIG. 1 , the clamping structure in this embodiment includes: the housing 101 is provided with an extruding part 108 that can interfere with the piezoelectric ceramic group 103 , and the nib 102 is provided with a piezoelectric ceramic group 103 installation part (not shown). It should be noted that the above-mentioned installation part for installing the piezoelectric ceramic group 103 can also be arranged in the housing 101 , and the pressing part that can be in conflict with the piezoelectric ceramic group 103 is arranged on the pen head 102 . Further, as shown in FIG. 1 , a diaphragm 107 is provided in the middle of the casing 101 in this embodiment, and the extruding part 108 is cylindrical and arranged in the middle of the diaphragm 107; correspondingly, the nib 102 is provided with The mounting part (not shown) of the piezoelectric ceramic group 103 matched with the extruding part 108, the piezoelectric ceramic group 103 is mounted on the mounting part, and interposed between the extruding part 108 and the mounting part.

Furthermore, at least one spring 109 is installed between the diaphragm 107 on the housing 101 and the nib 102 ; The casing 101 and the nib 102 are correspondingly provided with a limiting structure to prevent the nib 102 from popping up from the casing 101, for example, a card slot is provided on the inner wall of the housing 101, and correspondingly, a protrusion is provided on the outer wall of the nib 102; or A limit baffle is provided on the front end of the housing 101 , and a protrusion is provided on the outer wall of the nib 102 , so that the nib 102 is flexibly and elastically connected to one end of the housing 101 . The above-mentioned stretchable elastic connection structure between the housing 101 and the pen head 102 is only an example, and is not limited thereto.

The working process of the touch electronic pen in this embodiment is: when the touch electronic pen writes on the electronic blackboard or electronic whiteboard, the pen head 102 is squeezed, and the casing 101 and the pen head 102 move toward each other, driving the extrusion part 108 Extrude the piezoelectric ceramic group 103, the piezoelectric ceramic group 103 generates an electrical signal after being compressed and deformed, the circuit part 105 is used to process the voltage signal generated by the piezoelectric ceramic group 103 and output it to the driving module 104, and the discharge tip of the driving module 104 106 generates a strong electric field, which directly controls the imaging of the electronic blackboard or electronic whiteboard, and the imaging reaction time is short; and the electronic blackboard or electronic whiteboard does not need an induction positioning layer to obtain the writing track, and the structure is simple and the cost is low.

Example 2

Referring to FIG. 2 , this embodiment provides a touch electronic pen, including a housing 201, a pen head 202, a piezoelectric ceramic group 203, a driving module 204, and a voltage signal for processing the voltage signal generated by the piezoelectric ceramic group 203 and outputting it to The circuit portion 205 of the drive module 204 . The nib 202 is stretchably and elastically connected to one end of the casing 201. The housing 201 and the nib 202 are correspondingly provided with a clamping structure for clamping the piezoelectric ceramic group 203. The driving module 204 is fixed in the nib 202 and includes a discharge tip 206, the nib One end of 202 is provided with a through groove, and the discharge tip 206 is located in the through groove.

Further, referring to FIG. 2 , a transverse partition 207 is provided in the middle of the housing 201 in this embodiment, and there is an extruded part 208 in the middle of the transverse diaphragm 207, and the extruded part 208 is cylindrical; There is an installation part (not shown) of the piezoelectric ceramic group 203 corresponding to the extrusion part 208, and the piezoelectric ceramic group 203 is mounted on the installation part and sandwiched between the extrusion part 208 and the installation part.

Furthermore, at least one spring 209 is installed between the diaphragm 207 on the casing 201 and the nib 202 ; The casing 201 and the nib 202 are correspondingly provided with a limiting structure that prevents the nib 202 from popping up from the casing 201, for example, a card slot is provided on the inner wall of the casing 201, and correspondingly, a protrusion is provided on the outer wall of the nib 202; or A limit baffle is provided on the front end of the housing 201 , and a protrusion is provided on the outer wall of the nib 202 , so that the nib 202 is flexibly and elastically connected to one end of the housing 201 . The aforementioned flexible and elastic connection structure between the housing 201 and the pen head 202 is only an example, and is not limited thereto. The housing 201 in this embodiment is cylindrical, but this is not a limitation of the present invention, and can be designed in any shape as long as it is convenient for writing.

Preferably, referring to FIG. 2 , a flexible gasket 210 is provided at the front end of the nib 202 in this embodiment to act as a buffer, so that the nib 202 does not directly contact the writing surface, so as to protect the writing surface and the discharge tip.

Further, referring to FIG. 3 , the circuit part 205 of the electronic pen in this embodiment includes a piezoelectric sensing module 2051 electrically connected to the piezoelectric ceramic group 203, a photoelectric multiplication module 2052, a voltage multiplication module 2053 and an energy storage element 2054, The piezoelectric sensing module 2051 , the voltage multiplication module 2053 and the energy storage element 2054 are respectively electrically connected to the photoelectric multiplication module 2052 .

Correspondingly, the working process of the circuit part 205 in this embodiment is as follows: the piezoelectric ceramic group 203 generates an electrical signal after being deformed under pressure, the piezoelectric sensing module 2051 converts the electrical signal into an optical signal, and the photomultiplier module 2052 converts the above-mentioned The optical signal is re-converted into an electrical signal, and the current of the electrical signal is amplified and then output to the voltage multiplication module 2053. The voltage multiplication module 2053 amplifies the voltage of the electrical signal and then outputs it to the driving module 204, wherein the energy storage element 2054 is a photoelectric multiplication module 2052 power supply.

Further, referring to FIG. 4, the piezoelectric sensing module 2051 in this embodiment includes resistors R1-R6, capacitors C1-C4, diode D1, voltage regulator diode D3, triodes Q1-Q2, light-emitting diodes LED, thyristor SCR and power BT. Wherein, the output end of the piezoelectric ceramic group 203 in the nib 202 is respectively connected to one end of the resistor R1 and one end of the capacitor C1, the base of the triode Q2 is connected to the other end of the capacitor C1 and one end of the resistor R2, and the collector of the triode Q2 is connected to the capacitor One end of C4 and one end of resistor R4, the other end of resistor R2 is connected to the other end of resistor R1, the other end of resistor R4, one end of capacitor C2 and one end of resistor R3, the base of transistor Q1 is connected to the other end of capacitor C4 and the stable The cathode of diode D3, the collector of transistor Q1 is connected to one end of capacitor C3, the other end of resistor R3 and the cathode of diode D1, the emitter of diode Q1 is connected to one end of resistor R5 and one end of resistor R6, and the other end of resistor R5 is connected to The control electrode of the thyristor SCR, the anode of the thyristor SCR is connected to the negative pole of the light-emitting diode LED, the other end of the capacitor C3 is connected to the other end of the capacitor C2 and grounded, and the positive pole of the diode D1 is connected to the positive pole of the light-emitting diode LED and the power supply BT The positive pole of the power supply BT is connected to the cathode of the thyristor SCR, the other end of the resistor R6, the positive pole of the Zener diode D3, the emitter of the triode Q2 and the other output end of the piezoelectric ceramic group 203, and then grounded. Among them, the filter circuit is composed of resistor R1 and capacitor C1; the primary amplifier circuit is composed of triode Q2, resistor R2 and resistor R4; the voltage stabilizing circuit is composed of capacitor C4 and Zener diode D3; it is composed of triode Q1, resistor R6 and resistor R5 The secondary amplifying circuit is used for power amplification; the capacitor C2, the capacitor C3 and the resistor R3 form an anti-interference circuit to eliminate the interference of the secondary amplifying circuit to the transistor Q2.

Specifically, the piezoelectric ceramic group 203 in the nib 202 deforms after being subjected to the radial force of the extrusion part 208 to generate an electrical excitation, which is converted into an electrical signal lasting T after a series of processing, so that the The silicon-controlled tube SCR turns from off to on, and the light-emitting diode LED turns on and emits light. In this embodiment, as long as the time parameter T is set within an appropriate range, the smooth operation of the touch electronic pen can be guaranteed. At the same time, when the writing stops for T time, the circuit will stop working and enter the power-saving mode. At this time, the SCR tube SCR will change from on to off. Wherein, the value of the time parameter T can be determined by the time constant of the first-order circuit, and its value depends on the specific parameters of the circuit.

Further, the photomultiplier module 2052 in this embodiment is a photomultiplier tube.

Further, the voltage multiplication module 2053 in this embodiment includes an amplifying circuit and a quadruple half-wave voltage rectification circuit; as shown in FIG. The voltage of the signal is amplified, and its voltage can be amplified to hundreds of volts; the high-frequency transformer is composed of the first winding L1, the second winding L2, the third winding L3 and the iron core. Capacitors C11-C14 and diodes D11-D14 constitute a quadruple half-wave voltage rectification circuit, which is used to amplify the voltage again, and the voltage can be raised to more than 1,000 volts. Wherein, a resistor R13 and a resistor R14 are connected in series between the amplifying circuit and the four-times-half-wave rectification circuit.

Further, the energy storage element 2054 in this embodiment may be a storage battery or a super-capacity capacitor. Of course, it is also possible to directly use a power source such as a lithium battery for power supply.

Furthermore, as shown in FIG. 2 , the housing 201 is also provided with a charging terminal 211 and a common ground terminal, the charging terminal 211 is connected to the positive pole of the energy storage element 2054, and the common ground terminal is connected to the negative pole of the energy storage element 2054, so as to provide The energy storage element 2054 is charged.

Further, referring to FIG. 6 and FIG. 7 , the driving module 204 in this embodiment includes an outer cylindrical metal cylinder 2041 , an inner cylindrical metal cylinder 2042 and a discharge tip 206 . The inner cylindrical metal cylinder 2042 is electrically connected to the positive pole of the output end of the voltage multiplication module 2053, the outer cylindrical metal cylinder 2041 is electrically connected to the negative pole of the output end of the voltage multiplication module 2053, and the outer cylindrical metal cylinder 2041 is connected with a discharge tip 206.

The inner cylindrical metal cylinder 2042 and the outer cylindrical metal cylinder 2041 can be regarded as capacitors in the circuit. When a high voltage is connected, the negative charge will fill the entire interval formed by the inner cylindrical metal cylinder 2042 and the outer cylindrical metal cylinder 2041. The cylindrical metal cylinder 2041 will accumulate a large amount of negative charges. Since the surface of the discharge tip 206 is extremely small, the density of the negative charges of the discharge tip 206 is very large, and the high-density negative charges will generate a very strong negative electric field. In this implementation, only the negative electric field provided by the touch electronic pen is taken as an example. In practical applications, the touch electronic pen can also provide a positive electric field.

Preferably, referring to FIG. 2, the touch electronic pen in this embodiment further includes an erasing module 213 and a physical switch 214 arranged on one side of the housing 201, and the physical switch 214 is connected in series between the energy storage element 2054 and the erasing module 213 During the period, the physical switch 214 is used to control the opening/closing of the erasing module 213 . The erasing module 213 includes a plurality of discharge tips, which are respectively arranged in a plurality of through grooves on the side wall of the housing 201 , similar in structure to the discharge tips of a pen tip, and detailed description is omitted here. The plurality of discharge tips are respectively electrically connected to the positive pole of the energy storage element 2054. The erasing module 213 can provide a positive electric field, and its plurality of discharge tips form a larger erasing surface for erasing the touch electronic pen. What is written in the pen.

An embodiment of the present invention provides a touch electronic pen, which can directly control the imaging of an electronic blackboard or electronic whiteboard by processing the voltage signal generated by the deformation of the piezoelectric ceramic group and outputting it to the drive module, and generating a strong electric field through the discharge tip. , the imaging response time is short; and the electronic blackboard or the electronic whiteboard does not need a sensing positioning layer to obtain the writing track, and the structure is simple and the cost is low. The aforementioned piezoelectric sensing module can output a light signal that lasts for T, so that the electronic pen can continue to discharge, so that there will be no "broken ink" situation during the writing process with the electronic pen.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. A touch electronic pen, comprising a housing and a nib, characterized in that it also includes a piezoelectric ceramic group, a drive module and is used to process the voltage signal generated by the piezoelectric ceramic group and output it to the drive module The circuit part of the pen head is stretchably and elastically connected to one end of the housing, the housing and the pen head are correspondingly provided with a clamping structure for clamping the piezoelectric ceramic group, and the driving module is fixed on The nib contains a discharge tip, one end of the nib is provided with a through groove, and the discharge tip is located in the through groove. 2. The touch electronic pen according to claim 1, wherein the drive module comprises an inner cylindrical metal cylinder and an outer cylindrical metal cylinder, and the connection between the inner cylindrical metal cylinder and the output end of the circuit part The positive pole is electrically connected, the outer cylindrical metal cylinder is electrically connected to the negative pole of the output end of the circuit part, and the discharge tip is fixed on the outer cylindrical metal cylinder. 3. The touch electronic pen according to claim 1, wherein the circuit part comprises a piezoelectric sensing module electrically connected to the piezoelectric ceramic, a photoelectric multiplication module, a voltage multiplication module and an energy storage element, The piezoelectric sensing module, the voltage multiplication module and the energy storage element are respectively electrically connected to the photoelectric multiplication module. 4. The touch electronic pen according to claim 3, wherein the piezoelectric sensing circuit includes resistors (R1-R6), capacitors (C1-C4), diodes (D1), Zener diodes (D3 ), triodes (Q1-Q2), light-emitting diodes (LEDs), thyristors (SCR) and power supplies (BT); wherein, the output terminals of the piezoelectric ceramic group are respectively connected to one end of a resistor (R1) and a capacitor ( One end of C1), the base of the transistor (Q2) is connected to the other end of the capacitor (C1) and one end of the resistor (R2), the collector of the transistor (Q2) is connected to one end of the capacitor (C4) and one end of the resistor (R4), The other end of the resistor (R2) is connected to the other end of the resistor (R1), the other end of the resistor (R4), one end of the capacitor (C2) and one end of the resistor (R3), and the base of the transistor (Q1) is connected to the capacitor (C4) The other end of the diode (D3) and the negative pole of the Zener diode (D3), the collector of the transistor (Q1) is connected to one end of the capacitor (C3), the other end of the resistor (R3) and the negative pole of the diode (D1), and the emitter of the diode (Q1) Connect one end of the resistor (R5) to one end of the resistor (R6), the other end of the resistor (R5) is connected to the control electrode of the thyristor (SCR), and the anode of the thyristor (SCR) is connected to the light-emitting diode (LED) The negative pole, the other end of the capacitor (C3) is connected to the other end of the capacitor (C2) and grounded, the positive pole of the diode (D1) is connected to the positive pole of the light-emitting diode (LED) and the positive pole of the power supply (BT), and the negative pole of the power supply (BT) can be connected The cathode of the silicon controlled tube (SCR), the other end of the resistor (R6), the anode of the Zener diode (D3), the emitter of the triode (Q2) and the other output end of the piezoelectric ceramic group are grounded. 5. The touch electronic pen according to claim 3, wherein the photomultiplier module is a photomultiplier tube. 6. The touch electronic pen according to claim 3, wherein the voltage multiplication module includes an amplifying circuit composed of a high-frequency transformer and a triode (Q) and an amplifier circuit composed of capacitors (C11-C14) and diodes (D11-C14). D14) constitutes a quadruple half-wave rectification circuit. 7. The touch electronic pen according to claim 3, wherein the energy storage element is a storage battery. 8. The touch electronic pen according to claim 7, wherein a charging terminal and a common ground terminal are provided on the housing, the charging terminal is connected to the positive pole of the energy storage element, and the common ground The terminal is connected to the negative pole of the energy storage element. 9. The touch electronic pen according to any one of claims 3-8, wherein an erasing module and a physical switch are provided on one side of the housing, and the erasing module includes a plurality of discharge tips, so The plurality of discharge tips are respectively electrically connected to the anode of the energy storage element, and the physical switch is connected in series between the energy storage element and the erasing module. 10. The touch electronic pen according to any one of claims 1-8, wherein a washer is provided at one end of the pen tip.

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