KR20130079064A - Lighting device using induced power in nfc, smartphone with lighting device, smartphone case with lighting device - Google Patents

Abstract

PURPOSE: A light emitting device using induced power of a near field communication (NFC) frequency, a smart phone having the light emitting device, and a protective case are provided to input an RF signal generated through a loop antenna and to turn off the light emitting device. CONSTITUTION: A flexible printed circuit board (FPCB) (114a) of a film type has flexibility. The FPCB is electrically insulated. A loop antenna (114b) is formed in a square shape, a circular shape, or an elliptical shape on the FPCB. The loop antenna generates induced power while receiving an RF signal generated in an NFC antenna. An LED (114c) is installed at the end of the loop antenna.

Description

LIGHTING DEVICE USING INDUCED POWER IN NFC, SMARTPHONE WITH LIGHTING DEVICE, SMARTPHONE CASE WITH LIGHTING DEVICE}

The present invention relates to a light emitting device using an induction electromotive force of a short-range communication frequency, a smart phone with a built-in light emitting device, a protective case for a smart phone with a built-in light emitting device, and more particularly, transmitted from a loop antenna for NFC communication embedded in a smart phone. Light emitting device using induction electromotive force of near field communication frequency to turn on LED installed in smart phone case by using induced electromotive force induced from RF signal, smart phone with light emitting device, protective case for smart phone with light emitting device It is about.

With the spread of various types of mobile communication terminals, technologies for personally decorating their own terminals have been disclosed.

In the early days of the spread of mobile phones, it began with attaching a unique printed film to the outside of a mobile phone, and then developed a protective case made of plastic or silicon on the outside of the mobile phone to decorate the mobile phone and protect the mobile phone from external shocks.

In addition, a technology for mounting a light emitting member such as an LED on the outside of the mobile phone to detect a call or when a call is received to turn on the light emitting member is disclosed.

1 and 2 is an exploded perspective view showing the structure of a mobile phone protective case including a light emitting member according to an embodiment of the prior art.

The mobile phone protective case 1 of the prior art is coupled to the front case 10 and the rear case 20 and detachably coupled to the front and rear of the mobile phone, respectively, and is provided from the mobile phone is provided from the mobile phone The front light emitting sheet 30 having a plurality of light emitting members 32 that are turned on or off in response to a signal, and is detachably coupled to the inner surface of the rear case 20 to the light emitting member 32. It includes a power supply unit 50 for supplying power, and a front surface protection window 40 for protecting the front light emitting sheet 30.

Cell phone protective case (1) is not only to protect the mobile phone by wrapping the outer surface of the phone, but also made of a material having a slight elasticity, that is, ABS material serves to cushion the impact from the outside to some extent.

The outer surface of the front case 10 is attached to the front light emitting sheet 30 that receives a signal from the mobile phone. The front light emitting sheet 30 is provided by a flexible printed circuit board (FPCB) in which a plurality of circuits are patterned.

The front light emitting sheet 30 uses a plurality of LEDs as the light emitting member 32, a detection circuit 33 which is a circuit for detecting a predetermined signal wave among signals generated from a mobile phone, and a plurality of light emitting members 32. LED for switching the lighting mode of the LED lighting mode switching switch 35 and the microcomputer controlling the switching operation of the LED lighting mode switching switch 35 based on the signal wave detected by the detection circuit 33. (37, Microprocessor Computer) is provided.

The light emitting member 32 may be turned on / off by a current supplied from the power supply unit 50.

The protection case 1 of the prior art uses a method of detecting the signal generated from the mobile phone, that is, the RF signal for mobile communication to determine the lighting of the light emitting member 32. In addition, in order to operate the light emitting member 32, a separate power supply unit 50, that is, a battery 112, must be installed inside the protective case 1.

In other words, when the cellular phone detects an RF signal generated in a call state and confirms that the cellular phone is in operation, the microcomputer 37 turns on the light emitting member 32 using the power of the power supply unit 50.

However, in order to apply such a method, since a separate battery 112 for supplying power to the light emitting member 32 must be installed inside the protective case 1, the volume of the protective case 1 is increased, and the battery 112 When the) is exhausted, there is a problem that the user's inconvenience increases because the new operation can be performed normally.

Republic of Korea Patent Publication No. 2008-0079057 Republic of Korea Patent No. 0621934 Republic of Korea Registered Utility No. 0318809

The present invention for solving the above-mentioned problem receives the RF signal generated when using the NFC communication function in the smartphone with a built-in NFC communication function as a loop antenna, the LED is turned on using the induced electromotive force generated in the loop antenna It is an object of the present invention to provide a light emitting device using an induction electromotive force of a short-range communication frequency, a smart phone with a built-in light emitting device, a protective case for a smart phone with a built-in light emitting device.

The present invention has been made in order to solve the above-mentioned problem is to generate the induced electromotive force using the RF signal emitted from the NFC antenna 110 of the smart phone 100 having a near field communication (Near Field Communication) function, the induction A device for emitting light by electromotive force, comprising: a flexible printed circuit board (FPCB) 114a, which is a flexible and electrically insulated film, and a rectangular, circular, elliptical spiral shape on the FPCB 114a. A loop antenna 114b for generating an induced electromotive force while receiving an RF signal generated at 110; and an LED 114c installed at an end of the loop antenna 114b; and NFC in the smartphone 100 When the function is activated and the 13.56 MHz RF signal is emitted from the NFC antenna 110, the LED 114c is emitted by the induced electromotive force induced in the loop antenna 114b received the RF signal. It shall be.

And a matching circuit 114d installed at an end terminal of the loop antenna 114b to perform impedance matching of the loop antenna 114b for receiving the RF signal.

The light emitting device 114 further includes a capacitor for storing the induced electromotive force, and provides the electromotive force from the capacitor even after the dissipation of the RF signal from the NFC antenna 110 to the LED 114c is turned on. It is characterized in that to maintain.

According to another embodiment of the present invention, there is provided a smart phone 100 having a near field communication function, including an NFC chip 108 for implementing the near field communication function; NFC antenna 110 for emitting a 13.56MHz RF signal by the signal; and a light-emitting device 114 is adhesively attached to the inside of the rear cover 104, or built into the injection mold to be integrated with the case; The light emitting device 114 is a flexible printed circuit board (FPCB) 114a, which is a flexible and electrically insulated film, and is formed in a rectangular, circular, elliptical spiral shape on the FPCB 114a. Loop antenna (114b) for generating an induced electromotive force while receiving the RF signal generated in the); and LED (114c) installed at the end of the loop antenna (114b); includes, NFC function in the smart phone 100 Is activated and the NFC antenna (11 When the RF signal of 13.56 MHz is emitted from 0), the LED 114c emits light with induced electromotive force induced in the loop antenna 114b in which the RF signal is received.

And a matching circuit 114d installed at an end terminal of the loop antenna 114b to perform impedance matching of the loop antenna 114b for receiving the RF signal.

The present invention according to another embodiment has a receiving portion 202 made of a material having elasticity, as a case for protecting the outside of the smart phone 100 having a near field communication (Near Field Communication) function, the accommodation The light emitting device is installed on the inner surface of the unit 202 in an adhesive or integral type, and emits light by the RF signal emitted from the NFC antenna 110 by the signal transmitted from the NFC chip 108 of the smart phone 100. The light emitting device includes: a flexible printed circuit board (FPCB) 204 having a flexible and electrically insulated film form; and a rectangular, circular, elliptical spiral shape on the FPCB 204 and the NFC antenna 110. A loop antenna for generating an induced electromotive force while receiving an RF signal originated from the LED and an LED 206 installed at an end of the loop antenna; an NFC function is activated in the smartphone 100 and the NFC antenna ( To 110) When the RF signal of 13.56㎒ divergent, characterized in that to emit light to the LED (206) to the induced electromotive force is induced in the RF signal that is received the loop antenna.

And a matching circuit installed at an end terminal of the loop antenna to perform impedance matching of the loop antenna for receiving the RF signal.

According to the present invention, since the induced electromotive force is generated by using the RF signal generated by the smartphone itself without a separate power supply, and the LED can be emitted using the induced electromotive force, the structure of the case is simple and bulky. It becomes small, there is no need to replace the battery 112 there is an effect that can be used semi-permanently.

In addition, according to the present invention there is an effect that can be used by installing the light emitting device not only the smart phone case but also an external protective case.

1 and 2 are exploded perspective view showing the structure of a mobile phone protective case including a light emitting member according to an embodiment of the prior art.
Figure 3 is a perspective view showing the structure of a smartphone according to an embodiment of the present invention.
Figure 4 is an exploded perspective view showing a state in which the back cover removed from the smartphone of Figure 3;
5 is a plan view showing a pattern of a loop antenna.
6 is a circuit diagram illustrating a connection state between a loop antenna and an LED.
7 is a plan view showing a state in which a multiple loop antenna pattern is formed.
8 is an exploded perspective view showing a state in which a light emitting device is installed in a protective case for a smartphone.

Hereinafter, referring to the drawings, "a light emitting device using an induction electromotive force of a short range communication frequency, a smart phone with a light emitting device, a protective case for a smart phone with a light emitting device" (hereinafter, respectively, a "light emitting device ',' Smartphone 'and' protection case ').

3 is a perspective view showing the structure of a smartphone according to an embodiment of the present invention, Figure 4 is an exploded perspective view showing a state in which the back cover is separated from the smartphone of Figure 3, Figure 5 is a plan view showing a pattern of a loop antenna 6 is a circuit diagram illustrating a connection state between a loop antenna and an LED.

The light emitting device 114 of the present invention is produced by a method of adhesively attaching to the inside of the rear cover 104 of the smartphone 100 or by embedding it in an injection mold to be integrated with the case.

The LED 114c is built in the light emitting device 114 to emit light by induced electromotive force. Light emitted from the LED 114c exits through the rear cover 104. It is desirable to make the back cover 104 transparent or translucent to facilitate light divergence. Instead of the entire back cover 104, only the portion where the LED 114c is installed may be transparent, or a portion of the back cover 104 may be drilled so that only the LED 114c is exposed to the outside of the back cover 104.

The smartphone 100 includes a CPU 106 for transmitting and receiving voice signals and data while forming a communication line with a base station, and an NFC chip 108 for exchanging small amounts of data with a reader or tag located at a short distance.

NFC chip 108 is to implement a near field communication (Near Field Communication) function, when contacted or contactless contact with an external RF reader, credit card information, smartphone control information, information for user authentication, etc. To help. Information transmitted and received via the NFC chip 108 is transmitted to the CPU 106 and processed.

NFC function mainly transmits and receives data using 13.56MHz RF signal. The NFC device 110 with a NFC function is provided with a loop-type NFC antenna 110 for transmitting and receiving an RF signal of 13.56 MHz, the same type of loop antenna is formed on the external RF reader.

The configuration of the chip and antenna for implementing the NFC communication function, the operation principle and circuit of the reader, and the like are all previously disclosed technologies, and are not essential features of the present invention, and thus detailed description thereof will be omitted.

The power source for driving the light emitting device 114 of the present invention uses a power source of the smartphone 100, and uses a battery 112 built in the smartphone 100 to supply power in a non-powered, contactless manner. The LED 114c is turned on while transmitting.

The light emitting device 114 is manufactured by forming an antenna 114b and an LED 114c on a flexible printed circuit board (FPCB) 114a having a flexible and electrically insulated film. The FPCB 114a is large in ductility and can be manufactured flat so that it can be easily mounted inside the smartphone 100.

The FPCB 114a is formed with a loop antenna 114b having a rectangular, circular or elliptical spiral shape. The loop antenna 114b may be formed by winding a conductive metal wire several times, or a pattern including one or more polymers such as Cu, Ni, Au, and Ag may be implemented by a printing method such as silk screen and inkjet printing. In the case of metal wires, metal wires such as Cu, Ni, and Al are used, or alloy wires thereof are used.

In the case of forming a pattern by a printing method, it may be manufactured and printed in the form of a paste containing a polymer such as Au, Cu, Al, or carbon.

The loop antenna 114b pattern may consist of one or more loops, and may include a radio absorber to efficiently generate induced electromotive force. In the case of a plurality of loops, it is preferable to form a concentric circle in such a manner that an independent loop electrically isolated from one loop is formed and another loop is formed therein.

The loop antenna 114b is formed in a similar size to a position corresponding to the NFC antenna 110 of the smart phone 100 to maximize the induction of power.

A plurality of LEDs 114c are installed at the ends of the loop antenna 114b to emit light. The LED 114c is installed in a surface mount (SMD) manner on the FPCB 114a on which the loop antenna 114b is formed.

To operate the LED 114c in an optimal state using electromotive force induced by the loop antenna 114b, the impedances of the NFC antenna 110 and the loop antenna 114b need to be matched. It is installed on both ends of the loop antenna 114b. In the present invention, the matching circuit 114d may be selectively used.

Referring to the light emitting operation of the smart phone 100 having such a configuration, first, the user to activate the NFC function among the functions of the smart phone 100, to use the smart phone 100 to use as an RF reader or RF tag Operate. In this case, the NFC chip 108 transmits an RF signal through the NFC antenna 110 to transmit data to an external reader.

The 13.56 MHz RF signal emitted from the NFC antenna 110 is transmitted to the loop antenna 114b of the light emitting device 114 installed in the rear cover 104 or embedded in the rear cover 104.

The RF signal transmitted to the loop antenna 114b is converted into an induced electromotive force of a constant size by adjusting the impedance of the matching circuit 114d as necessary, and the induced electromotive force is transmitted to the LED 114c so that the LED 114c is turned on. do. And when the transmission of the RF signal for transmitting and receiving data of the NFC chip 108 is terminated LED (114c). If necessary, a small capacitor or the like is installed in the light emitting device 114 to allow the LED 114c to remain lit for a predetermined time even after the RF signal transmission of the NFC chip 108 is terminated.

7 is a plan view showing a state in which a multiple loop antenna pattern is formed.

As described above, rather than installing only one loop antenna 114b having a single loop inside the light emitting device 114, multiple loop loop antennas 124a, 124b, 124c, 124d, and 124e separated from each other as shown in FIG. By forming), it is possible to cope with signals of various frequencies and maximize the generation efficiency of induced electromotive force. Each loop antenna 124a, 124b, 124c, 124d, 124e is provided with one or more LEDs 126a, 126b, 126c, 126d, 126e.

On the other hand, Figure 8 is an exploded perspective view showing a state in which a light emitting device is installed in a protective case for a smartphone.

In the above embodiment, the installation of the light emitting device 114 to the back cover 104 of the smartphone 100 in the adhesive or integrally described, the protective case 200 of Figure 8 is produced separately from the smartphone 100 The light emitting device is installed in a protective case sold independently.

As the price of a mobile phone or a smartphone increases and its size increases, there is a growing need to protect the terminal from external shocks. In recent years, when a terminal is purchased, a separate protective case 200 is purchased and used to cover the surface. Most of the protective case 200 is made of a receiving portion 202 made of silicon or urethane material having a certain elasticity, the receiving portion 202 inside the smartphone 100 is seated. The protective case 200 covers the side or the rear of the smartphone 100 to prevent scratches.

By installing the light emitting device on the inner side of the receiving portion 202 of the protective case 200 in an adhesive or integral type, it is possible to produce a decorative effect by the lighting of the LED.

To this end, the FPCB 204 having the loop antenna, the LED 206, the matching circuit, or the like, is attached to the inner surface of the protective case 200 or embedded in the injection of the protective case 200 as described above. It is made in one piece. And when the NFC function is turned on while using the smart phone 100, the LED can be turned on to produce a decorative effect.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, As will be understood by those skilled in the art. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

100: smartphone 102: case
104: back cover 106: CPU
108: NFC chip 110: NFC antenna
112: battery 114, 120: light emitting device
200: protective case

Claims (7)

As a device for generating an induced electromotive force using the RF signal emitted from the NFC antenna 110 of the smart phone 100 having a near field communication (Near Field Communication) function, and the light emitting action by the induced electromotive force,
A flexible printed circuit board (FPCB) 114a in the form of a flexible and electrically insulated film;
A loop antenna (114b) formed on the FPCB (114a) in a rectangular, circular, elliptical spiral shape to generate induced electromotive force while receiving an RF signal generated from the NFC antenna (110);
It includes; LED 114c is installed at the end of the loop antenna (114b),
When the NFC function is activated in the smart phone 100 and the RF signal of 13.56 MHz is emitted from the NFC antenna 110, the LED 114c is induced by the induced electromotive force induced in the loop antenna 114b in which the RF signal is received. Light emitting device using induction electromotive force of the short-range communication frequency, characterized in that to emit light. The method of claim 1,
And a matching circuit 114d installed at the terminal of the end of the loop antenna 114b to perform impedance matching of the loop antenna 114b for receiving the RF signal. Device. The method of claim 1,
The light emitting device 114 further includes a capacitor for storing the induced electromotive force, and provides the electromotive force from the capacitor even after the dissipation of the RF signal from the NFC antenna 110 to the LED 114c is turned on. Light emitting device using induction electromotive force of the short-range communication frequency, characterized in that to maintain. As a smart phone 100 having a near field communication (Near Field Communication) function,
NFC chip 108 for implementing the short-range communication function;
NFC antenna (110) for emitting a 13.56MHz RF signal by the signal transmitted from the NFC chip (108);
It includes; a light-emitting device 114 that is adhesively attached to the back cover 104, or built into the injection mold and integrally manufactured with the case;
The light emitting device 114 is
A flexible printed circuit board (FPCB) 114a in the form of a flexible and electrically insulated film;
A loop antenna (114b) formed on the FPCB (114a) in a rectangular, circular, elliptical spiral shape to generate induced electromotive force while receiving an RF signal generated from the NFC antenna (110);
It includes; LED 114c is installed at the end of the loop antenna (114b),
When the NFC function is activated in the smart phone 100 and the RF signal of 13.56 MHz is emitted from the NFC antenna 110, the LED 114c is induced by the induced electromotive force induced in the loop antenna 114b in which the RF signal is received. Smartphone light-emitting device, characterized in that to emit light. 5. The method of claim 4,
And a matching circuit (114d) installed at the terminal of the end of the loop antenna (114b) for impedance matching of the loop antenna (114b) for receiving the RF signal. As the case having a receiving portion 202 made of a material having elasticity, and protects the outside of the smart phone 100 having a near field communication (Near Field Communication) function,
Adhesively or integrally installed on the inner surface of the receiving portion 202, the light emitted by the RF signal emitted from the NFC antenna 110 by the signal transmitted from the NFC chip 108 of the smart phone 100 Device,
The light emitting device
A flexible printed circuit board (FPCB) 204 in the form of a flexible and electrically insulated film;
A loop antenna formed on the FPCB 204 in a rectangular, circular, elliptical spiral shape to generate induced electromotive force while receiving an RF signal generated by the NFC antenna 110;
Includes; LED 206 is installed at the end of the loop antenna,
When the NFC function is activated in the smartphone 100 and an RF signal of 13.56 MHz is emitted from the NFC antenna 110, the LED 206 emits light with induced electromotive force induced in the loop antenna from which the RF signal is received. Characterized in that the protective case for a smartphone with a built-in light emitting device. The method according to claim 6,
And a matching circuit installed at an end terminal of the loop antenna to perform impedance matching of the loop antenna for receiving the RF signal.

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