CN210155638U

CN210155638U - Variable capacitance type electromagnetic touch pen

Info

Publication number: CN210155638U
Application number: CN201920065981.6U
Authority: CN
Inventors: 陆雪玉
Original assignee: Beijing Hanvon Peng Thai Polytron Technologies Inc
Current assignee: Shenzhen Hanwang Pengtai Technology Co ltd
Priority date: 2019-01-16
Filing date: 2019-01-16
Publication date: 2020-03-17
Anticipated expiration: 2029-01-16

Abstract

The utility model provides a capacitance-variable electromagnetic touch pen, which comprises a pen shell, wherein the pen shell comprises a pen shell rear end, a pen body and a pen shell front end, the pen shell rear end and the pen body form a cylinder structure with one closed end, and a pen system circuit is arranged in the cylinder structure; the front end of the pen shell adopts a hollow circular truncated cone structure, the larger diameter end of the circular truncated cone structure is connected with the open end of the cylindrical structure, and the pen point is arranged at the smaller diameter end of the circular truncated cone structure; the pen system circuit comprises a power supply module, a power supply control module and a signal generation module; the power supply control module is connected between the power supply module and the signal generation module; the power supply module comprises a battery and a booster circuit, and the power supply control module comprises an inductive switch, a voltage doubling circuit and a time delay circuit; the battery is connected with the signal generation module through the inductive switch, the voltage doubling circuit, the delay circuit and the booster circuit; the signal generation module transmits an electromagnetic signal. The utility model discloses can avoid the waste of electric energy, simple structure, the stable performance, the cost of manufacture is low.

Description

Variable capacitance type electromagnetic touch pen

Technical Field

The utility model belongs to the technical field of the touch-control pen, concretely relates to become electric capacity formula electromagnetism touch-control pen.

Background

The electromagnetic stylus works on the principle of using electromagnetic induction technology to simulate writing or other operations of the pen. When the electromagnetic touch pen writes on the touch panel, magnetic flux sensed by the electromagnetic sensor changes, and induced voltage is generated. The touch panel can position the touch position of the electromagnetic touch pen on the touch panel according to the induced voltage so as to facilitate subsequent touch operation.

Electromagnetic touch pens are mainly classified into passive type and active type according to whether a battery needs to be installed in the electromagnetic touch pen. Among them, in the active electromagnetic stylus, a battery needs to be installed to provide the electric energy required for transmitting the electromagnetic signal. The existing electromagnetic touch pen turns on or off a power supply through a function key arranged on the touch pen. When a user does not use the stylus pen, the user often forgets to turn off the power supply of the stylus pen, so that the stylus pen is always in a working state, and electric energy is wasted.

Disclosure of Invention

In order to overcome the problems existing in the related art at least to a certain extent, the utility model provides a variable capacitance electromagnetic touch pen.

According to a first aspect of embodiments of the present invention, the present invention provides a variable capacitance electromagnetic stylus comprising a pen housing, a pen system circuit and a pen tip;

the pen shell comprises a pen shell rear end, a pen body and a pen shell front end, the pen shell rear end and the pen body form a cylinder structure with one closed end, and the pen system circuit is arranged in the cylinder structure; the front end of the pen shell adopts a hollow circular truncated cone structure, the larger-diameter end of the circular truncated cone structure is connected with the open end of the cylindrical structure, and the pen point is arranged at the smaller-diameter end of the circular truncated cone structure;

the pen system circuit comprises a power supply module, a power supply control module and a signal generation module; the power supply control module is connected between the power supply module and the signal generation module; the power supply module comprises a battery and a booster circuit, and the power supply control module comprises an inductive switch, a voltage doubling circuit and a time delay circuit; the battery is connected with the inductive switch, the inductive switch is connected with the delay circuit through the voltage doubling circuit, and the delay circuit is connected with the signal generation module through the booster circuit; the signal generation module transmits an electromagnetic signal.

According to the variable capacitance electromagnetic touch pen, one end of the inductive switch is connected with the power module, the other end of the inductive switch is grounded after being connected with the first resistor in series, the input end of the voltage doubling circuit is connected with two ends of the first resistor in parallel, the output end of the voltage doubling circuit is connected with the control end of the control switch, the voltage input end of the control switch is connected with VCC, the voltage output end of the control switch is connected with the enabling end of the boosting circuit, and the voltage output end of the control switch is connected to the ground point in series through the delay circuit.

In the above capacitance-variable electromagnetic stylus, the control switch is an NPN-type triode.

In the above-mentioned variable capacitance electromagnetic stylus, the delay circuit includes a first capacitor and a second resistor, one end of the first capacitor is connected to the voltage output terminal of the control switch, the other end of the first capacitor is connected to the ground point, and the second resistor is connected in parallel to two ends of the first capacitor.

According to the variable capacitance electromagnetic touch pen, the signal generation module comprises an LC resonance circuit, a variable capacitance pressure sensor and a function key; the LC resonance circuit comprises a second capacitor, a third capacitor, an adjusting capacitor and an electromagnetic signal output coil; the adjusting capacitor is connected with the electromagnetic signal output coil in parallel, and a variable capacitor in the variable capacitor pressure sensor is connected with two ends of the LC resonance circuit in parallel; the booster circuit is connected with the variable capacitance type pressure sensor; and the function keys are respectively connected in series with the second capacitor and the third capacitor and then connected in parallel in the LC resonance circuit.

According to the variable capacitance electromagnetic touch control pen, the electromagnetic signal output coil is arranged in the front end of the pen shell and is positioned around the pen point.

According to the capacitance-variable electromagnetic touch control pen, the electromagnetic signal output coil is composed of a magnetic ring and a multi-layer enameled wire copper coil tightly wound on the surface of the magnetic ring, or is composed of a magnetic ring and a multi-layer yarn-covered copper wire tightly wound on the surface of the magnetic ring.

According to the capacitance-variable electromagnetic touch control pen, the electromagnetic signal output coil is composed of the magnetic ring and the multilayer yarn-covered copper wire tightly wound on the surface of the magnetic ring.

According to the variable capacitance electromagnetic touch pen, the variable capacitance pressure sensor comprises a sensor shell, a reset spring, a variable capacitor, a touch switch and a pressure transmission device; the variable capacitor comprises an insulating dielectric sheet and a flexible conducting sheet;

a conductor is laid on the first surface of the insulating dielectric sheet and is a first electrode of the variable capacitor; the second surface of the insulating dielectric sheet is an insulating dielectric surface of the variable capacitor, the soft conducting sheet is arranged at a very small interval from the insulating dielectric surface, one end of the soft conducting sheet is connected with one leading-out end of the return spring, and the other leading-out end of the return spring forms a second pole of the variable capacitor; the flexible conducting sheet is compressible conducting foam or conductive rubber capable of being deformed by extrusion, and the insulating medium on the second surface of the insulating dielectric sheet is a capacitance medium between the first pole and the second pole of the variable capacitor; the flexible conducting sheet is connected with the pressure transmission device into a whole;

the touch switch comprises a fixed contact and a movable contact, the fixed contact is fixed on the first surface of the insulating dielectric sheet, and the second pole of the variable capacitor forms the movable contact.

In the above variable capacitance electromagnetic stylus, the surface of the flexible conductive sheet opposite to the insulating medium surface of the variable capacitance is a zigzag line, or a cambered surface with a convex middle, or any convex shape uniformly distributed.

According to the above embodiments of the present invention, at least the following advantages are obtained: the utility model provides a varactor formula electromagnetism touch-control pen avoids the waste of electric energy through setting up inductive switch and delay circuit can the automatic cutout signal generation module's power supply. The signal generation module adopts a capacitance-variable resonant circuit, and has the advantages of simple structure, small pen point stroke change, stable performance and low manufacturing cost.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification of the invention, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic structural diagram of a capacitance-variable electromagnetic stylus according to an embodiment of the present invention.

Fig. 2 is a schematic circuit diagram of a power control module in a variable capacitance electromagnetic stylus according to an embodiment of the present invention.

Fig. 3 is a schematic circuit diagram of a variable capacitance electromagnetic stylus according to an embodiment of the present invention.

Fig. 4 is a structural diagram of a variable capacitance pressure sensor in a variable capacitance electromagnetic stylus according to an embodiment of the present invention.

Description of reference numerals:

1. a pen housing; 2. a pen system circuit; 21. a power supply module; 211. a battery; 212. a boost circuit; 22. a power supply control module; 221. an inductive switch; 222. a voltage doubler circuit; 223. a delay circuit; 23. a signal generation module; 231. an LC resonance circuit; 232. a variable capacitance pressure sensor; 2321. a sensor housing; 2322. a return spring; 2323. a variable capacitance; 2324. a pressure transmission device; 233. function keys; 3. a pen point.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the spirit of the present invention will be described in detail with reference to the accompanying drawings, and any person skilled in the art can change or modify the techniques taught by the present invention without departing from the spirit and scope of the present invention after understanding the embodiments of the present invention.

The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention. Additionally, the same or similar numbered elements/components used in the drawings and the embodiments are used to represent the same or similar parts.

As used herein, the terms "first," "second," …, etc. do not denote any order or sequential importance, nor are they used to limit the invention, but rather are used to distinguish one element from another or from another element or operation described in the same technical language.

With respect to directional terminology used herein, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology used is intended to be illustrative and is not intended to be limiting of the present teachings.

As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.

As used herein, "and/or" includes any and all combinations of the described items.

References to "plurality" herein include "two" and "more than two"; reference to "multiple sets" herein includes "two sets" and "more than two sets".

As used herein, the terms "substantially", "about" and the like are used to modify any slight variation in quantity or error that does not alter the nature of the variation. In general, the range of slight variations or errors that such terms modify may be 20% in some embodiments, 10% in some embodiments, 5% in some embodiments, or other values. It should be understood by those skilled in the art that the aforementioned values can be adjusted according to actual needs, and are not limited thereto.

Certain words used to describe the invention are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the invention.

Example one

Fig. 1 is a schematic structural diagram of a capacitance-variable electromagnetic stylus according to a first embodiment of the present invention. As shown in fig. 1, the variable capacitance electromagnetic stylus includes a pen case 1, a pen system circuit 2, and a pen tip 3. The pen casing 1 comprises a pen casing rear end, a pen body and a pen casing front end, the pen casing rear end and the pen body form a cylinder structure with one closed end, and the pen system circuit 2 is arranged in the cylinder structure. The front end of the pen shell adopts a hollow circular truncated cone structure, the larger diameter end of the circular truncated cone structure is connected with the open end of the cylinder structure, and the pen point 3 is arranged at the smaller diameter end of the circular truncated cone structure.

The pen system circuit 2 includes a power supply module 21, a power supply control module 22, and a signal generation module 23. The power control module 22 is connected between the power module 21 and the signal generation module 23, and is configured to control the power module 21 to supply power to the signal generation module 23.

The power module 21 includes a battery 211 and a voltage boost circuit 212, and the power control module 22 includes an inductive switch 221, a voltage doubler circuit 222 and a delay circuit 223. The battery 211 is connected with the inductive switch 221, the inductive switch 221 is connected with the delay circuit 223 through the voltage doubling circuit 222, and the delay circuit 223 is connected with the signal generating module 23 through the voltage boosting circuit 212.

The power module 21 is powered by the battery 211, the inductive switch 221 generates high and low levels by inducing the vibration of the electromagnetic stylus, and the high and low levels are amplified and shaped by the voltage doubling circuit 222 to control the charging and discharging of the delay circuit 223. The delay circuit 223 enables the voltage boost circuit 212 to output the required voltage to the signal generation module 23 or stop outputting the required voltage by charging and discharging the capacitor. When the electromagnetic stylus is still, the inductive switch 221 will not change in high and low levels, and the power supply will be turned off or enter a low power consumption mode, thereby avoiding waste of electric energy. The boost circuit 212 supplies the operating voltage to the signal generation module 23. The signal generation module 23 transmits an electromagnetic signal to the touch panel.

Example two

Fig. 2 is a schematic circuit diagram of a power control module in a variable capacitance electromagnetic stylus according to an embodiment of the present invention. The technical solution of the present embodiment is based on the first embodiment, as shown in fig. 2, in the present embodiment, the inductive switch 221 adopts a ball-type omni-directional signal with a model number of BL-2500 to trigger the sensing element. The element comprises a sealed square housing with balls and rollers disposed therein. The two symmetrical surfaces of the square shell are made of conductive metal, and the other surfaces of the square shell are made of plastic. The conductive metal may be copper, aluminum, gold, or the like. When the outside slightly vibrates or displaces, the ball moves back and forth along the rolling shaft, so that the metals at the two ends of the square shell are continuously conducted and closed, and irregular high and low levels are generated.

Specifically, as shown in fig. 2, the voltage doubler circuit 222 employs a voltage quadrupler circuit 222. One end of the inductive switch 221 is connected to the power module 21, and the other end is connected to the ground after being connected to the first resistor R1 in series. The input terminal of the voltage doubling circuit 222 is connected in parallel across the first resistor R1. The output terminal of the voltage doubling circuit 222 is connected to the control terminal of the control switch Q, the voltage input terminal of the control switch Q is connected to VCC, and the voltage output terminal thereof is connected to the enable terminal of the boost circuit 212. The voltage output of the control switch Q is connected in series to ground through the delay circuit 223. The voltage doubling circuit 222 may be a voltage doubling circuit 222, a voltage tripling circuit 222, a voltage quadrupler circuit 222, or the like, as necessary. Specifically, the control switch Q is an NPN transistor.

The delay circuit 223 includes a first capacitor C1 and a second resistor R2, one end of the first capacitor C1 is connected to the voltage output terminal of the control switch, the other end is connected to the ground, and the second resistor R2 is connected in parallel to two ends of the first capacitor C1.

The specific working principle is as follows: when the inductive switch 221 senses a slight vibration or a change in relative position of the electromagnetic stylus, an irregular movement of the ball inside the inductive switch 221 causes an irregular switching of the inductive switch 221, thereby generating an irregular minute signal.

The small signal is continuously amplified and shaped by the voltage doubling circuit 222, and finally a high level is obtained to turn on the control switch Q, so that the voltage VCC input by the voltage input terminal of the control switch Q can charge the first capacitor C1. The discharging process of the first capacitor C1 is realized by the second resistor R2 connected in parallel across the first capacitor C1. By adjusting the resistance of the second resistor R2, the discharge time of the first capacitor C1 can be changed.

When the discharge voltage of the first capacitor C1 reaches the threshold voltage of the voltage boost circuit 212, the voltage boost circuit 212 starts to work, and outputs the voltage required by the signal generation module 23; when the discharge voltage of the first capacitor C1 is lower than the threshold voltage of the voltage boost circuit 212, the voltage boost circuit 212 stops operating.

In practical application, except the capacitor, the delay circuit 223 can also need other devices with energy storage function, the utility model discloses do not use this as the limit.

Specifically, the signal generation module 23 employs an LC resonance circuit.

The specific working process of the electromagnetic touch pen is as follows: when the inductive switch 221 senses a slight vibration or a change in a relative position of the electromagnetic stylus, a minute signal generated by the inductive switch 221 is input to the voltage doubling circuit 222, and the voltage doubling circuit 222 amplifies and shapes the minute signal output by the inductive switch 221 to output a high level. The high level turns on the control switch Q, which charges the first capacitor C1 in the delay circuit 223. After the first capacitor C1 is charged to a predetermined voltage, it is discharged through the parallel resistor R5. After the discharge voltage reaches the threshold voltage of the boost circuit 212, the boost circuit 212 outputs the voltage required by the signal generation module 23, and the signal generation module 23 transmits an electromagnetic signal to the outside; when the discharging voltage of the first capacitor C1 is lower than the threshold voltage of the voltage boost circuit 212, the voltage boost circuit 212 stops working, and the signal generation module 23 automatically enters the low power consumption mode. The circuit structure of the variable capacitance electromagnetic touch pen provided by the embodiment is simple, the implementation is easy, the delay time of the delay circuit 223 is controllable, and the use performance of the electromagnetic touch pen can be improved.

EXAMPLE III

Fig. 3 is a schematic circuit diagram of a signal generating module in a variable capacitance electromagnetic stylus according to a third embodiment of the present invention. The technical solution of the present embodiment is based on the second embodiment, as shown in fig. 3, in the present embodiment, the signal generating module 23 includes an LC resonant circuit 231, a variable capacitive pressure sensor 232, and a function button 233. The LC resonance circuit 231 includes a second capacitor C2, a third capacitor C3, an adjustment capacitor C, and an electromagnetic signal output coil L. The electromagnetic signal output coil L is a resonance inductance of the LC resonance circuit 231. The adjusting capacitor C is connected with the electromagnetic signal output coil L in parallel. The variable capacitance Δ C in the variable capacitive pressure sensor 232 is connected in parallel across the LC resonance circuit 231. The booster circuit 212 is connected to the variable capacitance pressure sensor 232. The function button 233 is connected in series with the second capacitor C2 and the third capacitor C3, respectively, and then connected in parallel in the LC resonant circuit 231. The function buttons 233 are provided on the pen body.

Specifically, the electromagnetic signal output coil L is composed of a magnetic ring and a multilayer enameled wire copper coil tightly wound on the surface of the magnetic ring, or is composed of a magnetic ring and a multilayer yarn-covered copper wire tightly wound on the surface of the magnetic ring. The electromagnetic signal output coil L is arranged in the front end of the pen shell and is positioned around the pen point 3. The front end of the pen shell 1 is made of insulating materials.

The operating frequency f of the signal generation module 23 is determined by the following equation:

as can be seen from the above formula, if the variable capacitance Δ C in the variable capacitive pressure sensor 232 changes, or the function button 233 is pressed to connect the second capacitor C2 and the third capacitor C3 in series to change, or the adjustment capacitor C changes, the operating frequency f of the signal generating module 23 changes accordingly.

A resonance inductance and electromagnetic signal output coil L of the LC resonance circuit outputs an alternating electromagnetic signal, the alternating electromagnetic signal comprises a written pressure-sensitive signal and a functional key 233 signal, and the output signal can be finely adjusted and calibrated by an adjusting capacitor C.

The pen tip 3 may be made of an insulating material or a conductive material. When the pen point 3 is made of conductive materials, the pen point 3 can be connected with an electric field output signal to directly replace an electric field signal radiation antenna; or the electric field signal radiation antenna is connected with the electric field signal radiation antenna to be used as the electric field signal radiation antenna, so that the radiation intensity of the electric field signal is enhanced, and the writing sensitivity of the variable capacitance electromagnetic touch control pen is enhanced.

Specifically, fig. 4 is a structural diagram of a variable capacitance pressure sensor in a variable capacitance electromagnetic stylus according to an embodiment of the present invention. As shown in fig. 4, the variable capacitance pressure sensor 232 includes a sensor housing 2321, a return spring 2322, a variable capacitance 2323, a touch switch, and a pressure transmission member 2324. The variable capacitor 2323 includes an insulating dielectric sheet and a flexible conductive sheet. The first side of the dielectric sheet is applied with a conductor, which is the first electrode of the variable capacitor 2323. The second surface of the insulating dielectric sheet is an insulating dielectric surface of the variable capacitor 2323, and the flexible conductive sheet is arranged at a very small interval from the insulating dielectric surface. One end of the soft conductive plate is connected to one leading-out terminal of the reset spring 2322, and the other leading-out terminal of the reset spring 2322 forms a second pole of the variable capacitor 2323. The flexible conducting sheet is made of compressible conducting foam or conductive rubber capable of being deformed by extrusion, and the insulating medium on the second surface of the insulating dielectric sheet is a capacitance medium between the first electrode and the second electrode of the variable capacitor 2323. The flexible conductive sheet is integrated with the pressure transmission device 2324. When the pressure transmission device 2324 is subjected to touch force, the touch force is firstly transmitted to the soft conducting plate, and the soft conducting plate is deformed and then contacts the insulating medium surface of the variable capacitor 2323 to be transmitted to the insulating medium plate. The larger the contact force is, the larger the deformation generated by the soft conductive sheet is, the larger the contact area between the soft conductive sheet and the insulating medium surface is, and the larger the capacitance value between two stages of the variable capacitor 2323 is.

The touch switch comprises a fixed contact and a moving contact, wherein the fixed contact is fixed on the first surface of the insulating dielectric sheet, and the second pole of the variable capacitor 2323 forms the moving contact. When the pen point 3 is stressed, the movable contact is stressed by the pressure transmission device 2324, the reset spring 2322 is compressed downwards, and the soft conducting sheet deforms until the deformation of the soft conducting sheet reaches the maximum state; when the force applied to the pen point 3 disappears, the return spring 2322 returns the movable contact to the original position.

The deformation of the soft conductive sheet can cause the change of the capacitance value of the variable capacitor 2323, and the change of the capacitance value causes the change of the frequency of the resonant circuit, so that the pressure value of the deformation of the soft conductive sheet can be reflected indirectly through the change of the frequency of the resonant circuit.

In this embodiment, the surface of the flexible conductive sheet opposite to the insulating medium surface of the variable capacitor 2323 may be a zigzag line, or a cambered surface with a convex middle, or any convex shape uniformly distributed.

The foregoing is only an illustrative embodiment of the present invention, and any equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention should fall within the protection scope of the present invention.

Claims

1. A variable capacitance electromagnetic touch pen is characterized by comprising a pen shell, a pen system circuit and a pen point;

2. The variable capacitance electromagnetic stylus pen according to claim 1, wherein one end of the inductive switch is connected to the power module, the other end of the inductive switch is connected to the ground after being connected to the first resistor in series, an input end of the voltage doubling circuit is connected to two ends of the first resistor in parallel, an output end of the voltage doubling circuit is connected to a control end of the control switch, a voltage input end of the control switch is connected to VCC, a voltage output end of the control switch is connected to the enable end of the voltage boost circuit, and a voltage output end of the control switch is connected to the ground through the delay circuit in series.

3. The variable capacitance electromagnetic stylus according to claim 2, wherein the control switch is an NPN-type triode.

4. The variable capacitance electromagnetic stylus pen according to claim 2, wherein the delay circuit comprises a first capacitor and a second resistor, one end of the first capacitor is connected to the voltage output terminal of the control switch, the other end of the first capacitor is connected to the ground point, and the second resistor is connected in parallel to two ends of the first capacitor.

5. The variable capacitance electromagnetic stylus according to claim 1, wherein the signal generating module comprises an LC resonant circuit, a variable capacitance pressure sensor, and a function key; the LC resonance circuit comprises a second capacitor, a third capacitor, an adjusting capacitor and an electromagnetic signal output coil; the adjusting capacitor is connected with the electromagnetic signal output coil in parallel, and a variable capacitor in the variable capacitor pressure sensor is connected with two ends of the LC resonance circuit in parallel; the booster circuit is connected with the variable capacitance type pressure sensor; and the function keys are respectively connected in series with the second capacitor and the third capacitor and then connected in parallel in the LC resonance circuit.

6. The variable capacitance electromagnetic stylus according to claim 5, wherein the electromagnetic signal output coil is disposed within the front end of the pen housing around the pen tip.

7. The variable capacitance electromagnetic stylus according to claim 5, wherein the electromagnetic signal output coil is composed of a magnetic ring and a plurality of layers of enameled copper wires tightly wound around the surface of the magnetic ring, or is composed of a magnetic ring and a plurality of layers of covered copper wires tightly wound around the surface of the magnetic ring.

8. The variable capacitance electromagnetic stylus according to claim 5, wherein the electromagnetic signal output coil is composed of a magnetic ring and a plurality of layers of covered copper wires densely wound around the surface of the magnetic ring.

9. The variable capacitance electromagnetic stylus according to claim 5, wherein the variable capacitance pressure sensor comprises a sensor housing, a return spring, a variable capacitance, a touch switch, and a pressure transmission device; the variable capacitor comprises an insulating dielectric sheet and a flexible conducting sheet;

10. The variable capacitance electromagnetic stylus pen according to claim 9, wherein the surface of the flexible conductive sheet opposite to the insulating medium surface of the variable capacitance is a zigzag line, or a cambered surface with a convex middle part, or any convex shape uniformly distributed.