KR20160128042A - Electromagnetic pen - Google Patents

Abstract

Provided is an electromagnetic pen. According to an embodiment of the present invention, the electromagnetic pen includes: a housing having a constant length; a pen pressure sensing means embedded in the housing and applying magnetic force to a terminal side; a wireless communications module prepared in the housing and enabling wireless communications with a terminal and an external device; and a power supply unit generating power by using magnetic force generated between the pen pressure sensing means and the terminal. The power generated in the power supply unit can be used as driving power of the wireless communications module.

Description

Electromagnetic pen

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pen, and more particularly to an electromagnetic pen in which it is not necessary to incorporate a separate battery as a driving power source for driving a wireless communication module without changing the overall appearance.

2. Description of the Related Art [0002] In recent display devices, a touch screen input method in which a user directly touches a screen using a finger or an electromagnetic pen and inputs the touch screen input method is widely used. Such a touch screen input method is mainly employed in portable terminals such as a smart phone, a mobile phone, a notebook computer, an all-in-one PC, a tablet PC, and a portable multimedia player (PMP). The touch screen input method can provide an intuitive and convenient user interface as an input means for a user to touch a specific position of a display screen and input position information indicated by the user instead of a keyboard, a mouse or a physical button, The touch input method using the touch input method is more effective in designing the coordinates than the touch input using the finger, so it is suitable for performing the graphic work like CAD.

Such a touch screen input method may be called a digitizer or an electric graphic input panel (EGIP). Depending on a method of detecting a position pointed by a user, a resistive method, a capacitive method, (ElectroMagnetic Resonance, EMR) method (or electromagnetic method).

The resistance film method is a method of sensing a position depressed by a pressure with a change in the amount of current in a state in which a direct current voltage is applied and a thin conductive layer of two layers on the screen is contacted by a pressure by an electromagnetic pen such as a finger or a stylus pen .

The capacitive method is a method of detecting capacitance by using a capacitance coupling in the state of applying an AC voltage. The object to be sensed must be a conductor and a contact area of more than a certain level is required to change the sensible capacitance .

On the other hand, the EMR system uses a so-called digitizer sensor substrate formed of an array of loop coils. Accordingly, when the user moves the electromagnetic pen, the electromagnetic pen is driven by an AC signal to cause a resonating magnetic field, and the resonating magnetic field induces a signal to the coil of the digitizer sensor substrate, Position.

In addition to the function of touching the touch screen, the electromagnetic pen according to the related art may be equipped with a wireless communication module to enable wireless connection with the terminal.

However, the conventional electromagnetic pen has a problem in that the size of the electromagnetic pen is increased because a power battery is additionally installed inside the electromagnetic pen for wireless communication with an external device.

Korea Patent Publication No. 2010-0123386 (Published on November 24, 2010)

SUMMARY OF THE INVENTION The present invention has been conceived in view of the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing a wireless communication module, And it is an object of the present invention to provide an electromagnetic pen capable of performing a wireless communication function without adding a separate power battery.

According to an aspect of the present invention, there is provided a wireless communication device including: a housing having a predetermined length; a pressure sensing means for applying a magnetic force to a terminal side; And a power supply unit that generates power using magnetic force generated between the pressure sensing unit and the terminal, and the power generated by the power supply unit can be used as a driving power for the wireless communication module.

In addition, the power supply unit may include a capacitor connected to the pressure sensing unit to store the magnetic force.

In addition, the wireless communication module may include a control unit for controlling a transmitting and receiving unit for transmitting and receiving signals and data to and from the terminal and an external device, and a transmitting and receiving unit.

The apparatus may further include a sensing unit that senses a magnetic force generated by the pressure sensing unit.

In addition, the housing may include a switch electrically connected to the control unit to operate the wireless communication module on one side of the housing.

Further, the housing may further include an operation key electrically connected to the control unit on one side of the housing to control operation of an application program of the terminal or the external device.

In addition, the operation keys can execute backward, forward, screen capture, mode conversion, various moving pictures and music of the terminal or external device.

And a tip portion protruding outward from one end of the housing, the tip portion being movable into the housing.

The pressure sensing means may include a bobbin embedded in the housing, a coil wound around the bobbin, and a magnet member coupled to the tip and configured to move into the bobbin, wherein the magnetic force with the coil changes with movement of the tip. .

The pressure sensing means may include a magnet member embedded in the housing, a coil wound around the outer circumferential surface of the magnet member, and a capacitance portion provided between the magnet member and the tip portion, the capacitance of which changes due to movement of the tip portion.

According to the present invention, power is generated and stored in a power supply unit using magnetic force generated between the electromagnetic pen and the terminal, and the stored power is used as a driving power for driving the wireless communication module, The wireless communication function of the electromagnetic pen can be performed without adding a battery.

Further, since it is not necessary to add a separate battery as in the prior art, it is possible to make the electromagnetic pen slim, and the weight can be reduced.

1 is a diagram illustrating an electromagnetic pen and a terminal according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating an example of a pressure sensing means of an electromagnetic pen according to an embodiment of the present invention.
3 is a cross-sectional view showing another example of the pressure sensing means of the electromagnetic pen according to the embodiment of the present invention.
4 is a block diagram of an electromagnetic pen according to an embodiment of the present invention.
5 is a flowchart showing a method of driving an electromagnetic pen according to an embodiment of the present invention.
6 is a flowchart illustrating a method of operating a wireless communication between an electromagnetic pen and a terminal according to an exemplary embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

As shown in FIG. 1, the terminal 100 and the electromagnetic pen 200 according to an embodiment of the present invention can operate in an electromagnetic flow manner.

The terminal 100 includes a touch panel. The touch panel of the terminal 100 includes a first touch panel for recognizing a general touch input or a proximity touch input by a user's finger, a stylus, etc. and a touch panel for recognizing a touch input by the electromagnetic pen 200 or a proximity touch input 2 touch panel may be combined.

Alternatively, the first touch panel and the second touch panel may be integrally formed. The first touch panel may be formed by an electrostatic capacity type, a resistance film type, an ultrasonic type, an infrared type, and the second touch panel may be formed by an electromagnetic induction type touch panel.

The second touch panel 110 of the terminal 100 may include a coil drive driver 120 and a loop coil 130. The electromagnetic pen 100 may include a capacitor and an inductor ) Can be seen as a writing instrument with a built-in resonant circuit.

When the coil driving driver 120 receives a switching pattern having a predetermined frequency, that is, a resonance frequency of the resonance circuit of the electromagnetic pen under the control of the MCU of the terminal, the AC driving voltage is supplied to the loop coil 130).

The loop coil 130 has a predetermined inductance and emits an induced electromagnetic force by an input AC voltage.

On the other hand, in the resonance circuit of the electromagnetic pen 200, resonance is caused by the induced electromagnetic force to generate an induced current, and the generated induced current is stored in the inductor and the capacitor. When the emission of the induced electromagnetic force is stopped, the resonance circuit is resonated by self-stored induced electromagnetic force to emit the magnetic force.

The terminal 100 constitutes a pen sensing area 140 in the inner space of the loop coil 130 and magnetic sensing means of various types may be disposed in the pen sensing area 140.

At this time, when the electromagnetic pen 200 emits self-emitted magnetic force, the pen sensing area 140 of the terminal senses the magnetic force of the electronic pen, and the coordinate (x, y) It is regarded that the user intends to input an operation using the electromagnetic pen 200 to the measured coordinates.

Further, by mechanically connecting the tip portion 250 with which the electromagnetic pen 200 comes into contact with the pen sensing area 140 of the terminal and the contact sensing inductor and / or the contact sensing capacitor, The inductance and / or the capacitance may be changed according to the pressure applied to the terminal.

Accordingly, if the terminal can measure the amount of change of the inductance and / or the capacitance, it is possible to measure the pressure indicating the degree to which the user presses the electromagnetic pen 200 against the terminal 100.

  The configuration of the specific electromagnetic pen 200 will be described in detail with reference to FIGS. 2 to 5. FIG.

The electromagnetic pen 200 according to an embodiment of the present invention includes a housing 210, a pressure sensing means 220, a wireless communication module 230, and a power supply 240 as shown in FIG. 2 .

The housing 210 is an outer case of the electromagnetic pen 200, and may be formed in a pen shape having a predetermined length.

In addition, a tip portion 250 may be protruded from one side of the housing 210.

The tip portion 250 may be moved to the housing 210 side by a pressing force of the user and may be restored to the original position when the pressing force of the user is removed.

At this time, when the surface of the pen sensing area 140 is touched by the tip part 250, the tip part 250 may be moved toward the housing 210 to press the pressure sensing means 220 inside the housing 210.

The pressure sensing means 220 is for sensing the pressure of the electromagnetic pen 200 on the pen sensing region 140 of the terminal 100. The pressure sensing means 220 measures the change in inductance due to the movement of the magnet member, Or by measuring the change in capacitance as shown in FIG. 3, the pressure of the electromagnetic pen 200 can be sensed.

2 includes a bobbin 222 and a bobbin 222 housed in the housing 210 by applying a magnetic force to the terminal 100. The bobbin 222 and the bobbin 222 are housed in the housing 210, A coil 224 wound around the outer circumferential surface, and a magnet member 226 installed to be moved into the bobbin 222.

The bobbin 222 may be formed to have a predetermined length and be installed in the housing 210, and may have a hollow pillar shape.

The coil 224 may be wound on the outer peripheral surface of the bobbin 222 and both ends of the coil 224 may be connected to a capacitor 229 forming a resonant circuit together with the coil 224 and the magnet member 226.

The magnet member 226 is installed to be reciprocally movable within the bobbin 222 and one end of the magnet member 226 can be engaged with the tip portion 250.

Accordingly, when the tip portion 250 presses the surface of the pen sensing region 140, the tip portion 250 is moved into the housing 210 to move the magnet member 226, which is engaged with the tip portion 250, It can be moved backward.

That is, the inductance generated between the magnet member 226 and the coil 224 wound around the bobbin 222 increases as the magnet member 226 moves into the bobbin 222, The magnetic force generated by resonance of the magnet 200 is changed, so that the terminal 100 can sense the pressure.

3, a magnet member 226 'embedded in the housing 210, a coil 224' wound on the outer circumferential surface of the magnet member 226 ' And a capacitance portion 228 provided between the magnet member 226 'and the tip portion 250.

The magnet member 226 'is formed in a predetermined length and is installed in the housing 210, and may be formed into a hollow columnar shape.

The coil 224 'may be wound on the outer circumferential surface of the magnet member 226'.

The capacitive portion 228 may be provided with electrodes 228a and 228b on the respective surfaces of the magnet member 226 'and the tip portion 250 facing each other and a dielectric 228c may be provided between the electrodes 228a and 228b. May be provided.

By varying the distance between the two electrodes 228a, 228b, a variable capacitance value can be obtained.

The capacitance C can be calculated by the following equation, where A is the overlapping area of each electrode, d is the distance between the electrodes, and? Is the dielectric constant between the electrodes.

C =? A / d

That is, as the distance d between the two electrodes 228a and 228b becomes smaller, the value of the capacitance C can be increased.

On the other hand, when elasticity is added to the dielectric 228c between the electrodes 228a and 228b, the electrodes 228a and 228b can be pressed and pressed together and then restored.

A capacitor 229 forming a resonant circuit together with the coil 224 ', the magnet member 226' and the capacitance portion 228 is connected in parallel with the coil 224 'and the capacitance portion 228 .

3, when the user touches the pen sensing area 140 of the terminal 100 with the electromagnetic pen 200, the tip of the tip of the electromagnetic pen 200 (250) moves toward the housing (210) side.

The distance d between the pair of electrodes 228a and 228b is reduced when the tip portion 250 is moved toward the housing 100 so that the capacitance can be increased and thus the magnetic force So that the terminal 100 can sense the pressure.

The electromagnetic pen 200 having the above-described configuration according to FIGS. 2 and 3 may be capable of wireless communication through the wireless communication module 230 with the terminal 100 or an external device.

Here, the external device is a device capable of wireless communication with the electromagnetic pen 200, and may be implemented as a desktop computer, a tablet, a digital camera, a notebook, an electronic blackboard, and a TV.

4, the wireless communication module 230 includes a transmission / reception unit 232 for transmitting and receiving signals and data to / from the terminal 100 and an external device, and a control unit 250 for controlling the transmission / reception unit 232. [ (234).

The sensing unit 250 may be installed inside the housing 210 and the sensing unit 250 may be connected to the sensing unit 220 for sensing that the magnetic force is generated by the sensing unit 220 .

The transmitter-receiver unit 232 may include a transmitter 232a for up-converting and amplifying the frequency of the transmitted radio signal, and a receiver 232b for low-noise amplifying the received radio signal and down-converting the frequency of the received radio signal.

In addition, when the terminal 100 and the external device support a short-range wireless communication function such as Wi-Fi communication, Bluetooth communication, and NFC (Near Field Communication) communication, the wireless communication module 230 of the electromagnetic pen 200 may include a Wi- A Bluetooth communication module, and an NFC communication module.

Meanwhile, when the terminal 100 does not provide a wireless communication function, the wireless communication module 230 may be omitted.

The control unit 234 can control the signal flow between the internal blocks of the electromagnetic pen 200 and can perform a data processing function of processing the data.

A switch 260 and an operation key 270 may be provided on one side of the housing 210.

The switch 260 may be used to connect power to the wireless communication module 230 and may be electrically connected to the control unit 234 to operate the transceiver unit 232.

An operation key 270 is used to control the operation of the application program of the terminal 100 or an external device.

For example, it is possible to execute specific functions of the terminal 100 or an external device such as backward, forward, screen capture, mode conversion, various moving pictures and music through the electromagnetic pen 200.

That is, when the operation key 270 is not depressed, the function as the electromagnetic pen 200 is performed through the magnetic field between the pen sensing area 140 of the terminal 100 and the pressure sensing unit 220, 270), it is possible to perform other functions with respect to the terminal 100 or an external device.

Here, the switch 260 and the operation keys 270 can be controlled by the control unit 234. [

The control unit 234 may be connected to a power supply unit 240 that supplies power to the transmission / reception unit 232 of the wireless communication module 230.

Specifically, the power supply unit 240 can be used as a driving power source for the wireless communication module 230 by using a power generated by the magnetic force generated between the pressure sensing unit 220 and the terminal 100.

That is, the power supply unit 240 may be connected to the pressure sensing unit 220 and the wireless communication module 230, and may be used as a power source by storing the magnetic force formed in the resonance circuit of the pressure sensing unit 220.

The power supply unit 240 may include a capacitor that is electrically connected to the control unit 234 and stores a magnetic force to operate the transmission / reception unit 232.

The operation of the electromagnetic pen 200 including the above-described configuration will be described with reference to Figs. 5 and 6. Fig.

5, when the electromagnetic pen 200 is touched on the pen sensing area 140 of the terminal 100, the pen sensing area 140 of the terminal 100 and the pressure sensing of the electromagnetic pen 200 A magnetic force can be formed in the means 220 (S310).

At this time, the sensing unit 250 senses that the magnetic force sensing unit 220 of the electromagnetic pen 200 has formed a magnetic force, and transmits a signal indicating that a magnetic force is formed to the control unit 234 (S320).

The control unit 234 transmits a signal indicating that the magnetic force is generated by the pressure sensing unit 220 of the electromagnetic pen 200 to the power supply unit 240 and the power supply unit 240 generates a signal The magnetic force is accumulated (S330).

The operation of the electromagnetic pen 200 and the external device or the terminal 100 in wireless communication will be described with reference to FIG.

A switch 260 provided on one side of the housing 210 of the electromagnetic pen 200 for performing some functions of the external device or the terminal 100 using the electromagnetic pen 200, Button.

At this time, when the switch 260 is pressed, the power stored in the power supply unit 240 is applied to the wireless communication module 230 (S410).

Thereafter, the wireless communication module 230 may be wirelessly connected to the external device or the terminal 100 by wireless communication with the external device or the terminal 100 (S420).

Finally, when the operation key 270 is pressed, a signal is transmitted to the external device or the terminal 100 through the transmitter 232a of the wireless communication module 230 (S430).

At this time, a signal transmitted from the transmitter 232a to the external device or the terminal 100 is a signal capable of executing a specific function of the terminal 100 or an external device.

For example, a specific function of the terminal 100 or an external device can execute backward, forward, screen capture, mode conversion, various moving pictures and music.

Accordingly, by using the magnetic force generated between the electromagnetic pen and the terminal to generate power from the power supply unit and storing the power, the stored power is used as a driving power for driving the wireless communication module, The wireless communication function of the electromagnetic pen can be performed.

Further, since it is not necessary to add a separate battery as in the prior art, it is possible to make the electromagnetic pen slim, and the weight can be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: terminal 200: electromagnetic pen
210: Housing 220: Pressure sensing means
230: Wireless communication module 240: Power supply
250: tip portion 260: switch
270: Operation keys

Claims (10)

A housing having a predetermined length;
A pressure sensing means built in the housing for applying a magnetic force to the terminal side;
A wireless communication module provided in the housing to enable wireless communication with the terminal and an external device; And
And a power supply unit for generating power by using a magnetic force generated between the pressure sensing means and the terminal,
Wherein the power generated by the power supply unit is used as a driving power source for the wireless communication module. The method according to claim 1,
And the power supply unit includes a capacitor connected to the pressure sensing unit to store the magnetic force. The method according to claim 1,
The wireless communication module comprising:
A transmitting and receiving unit transmitting and receiving signals and data to and from the terminal and external equipment; And
And a controller for controlling the transceiver. The method of claim 3,
And a sensing unit for sensing a magnetic force generated by the pressure sensing unit. The method of claim 3,
And a switch electrically connected to the control unit to operate the wireless communication module on one side of the housing. The method of claim 3,
And an operation key electrically connected to the control unit on one side of the housing to control operation of an application program of the terminal or the external device. The method according to claim 6,
Wherein the operation keys execute backward movement, forward movement, screen capture, mode conversion, various moving pictures and music of the terminal or the external device. The method according to claim 1,
And a tip portion protruding outward from one end of the housing, the tip portion being movable into the housing. 9. The method of claim 8,
The pressure sensing means comprises:
A bobbin embedded in the housing;
A coil wound on an outer circumferential surface of the bobbin; And
And a magnet member which is installed to be coupled with the tip portion and is moved to the inside of the bobbin and whose magnetic force with the coil changes with movement of the tip portion. 9. The method of claim 8,
The pressure sensing means comprises:
A magnet member embedded in the housing;
A coil wound on an outer circumferential surface of the magnet member; And
And a capacitance portion provided between the magnet member and the tip portion, the capacitance of which changes due to the movement of the tip portion.

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