JP5713476B1 - Light emitting device and false nail - Google Patents

Abstract

A small light emitting device and an artificial nail that can be charged and used repeatedly are provided. A resonance circuit for generating a voltage based on a magnetic flux received via a coil, a charging circuit for charging a battery with the voltage generated by the resonance circuit, and a power supplied from the battery. And a light emitter 18A that emits light by a direct current. [Selection] Figure 4

Description

  The present invention relates to a light emitting device and an artificial nail.

  As this type of light emitting device, there is disclosed an artificial nail including a thin plate battery disposed on a substrate and a light emitting diode (LED: Light Emitting Diode) that emits light by a direct current supplied from the battery (for example, Patent Document 1). In the case of the above-mentioned Patent Document 1, when the battery runs out, there is a problem that the battery must be replaced and discarded.

  On the other hand, there is disclosed an artificial nail comprising a solar cell layer, a battery that stores the generated power of the solar cell layer, and a display unit that displays predetermined display data by the power supplied from the battery (for example, Patent Document 2). In the case of the above-mentioned patent document 2, since it is possible to generate power with a solar cell, battery replacement is unnecessary.

JP 2009-268893 A JP 2006-262882 A

  However, in the case of the above-mentioned patent document 2, in order to generate electric power necessary for displaying display data on the display unit, a large solar cell layer is required, and thus there is a problem that an artificial nail is also enlarged. .

  Accordingly, an object of the present invention is to provide a small light emitting device and an artificial nail that can be charged and used repeatedly.

A light emitting device according to the present invention includes a resonance circuit that generates a voltage based on magnetic flux received through a coil, a charging circuit that charges a battery with the voltage generated by the resonance circuit, and a direct current supplied from the battery. A light-emitting body that emits light by current, and a switch that turns on and off a direct current supplied to the light-emitting body using a resistance of a human body, the switch including a first electrode as a power supply electrode connected to the battery, A second electrode and a third electrode as indicator electrodes connected to an indicator for instructing on / off of the light emitter; and a fourth electrode as a grounded ground electrode, wherein the first electrode and the second electrode Constitutes an on electrode, the third electrode and the fourth electrode constitute an off electrode, the on electrode on one side in the width direction of the circuit board provided with the charging circuit, and the other on the other side Off electrode Is formed, characterized in Rukoto.

  The artificial nail according to the present invention is characterized by using the light emitting device.

  According to the present invention, a voltage is generated in the resonance circuit based on the magnetic flux supplied from the outside, and the battery is charged with the voltage, so that the size can be reduced as compared with the conventional case.

It is a perspective view showing the whole false nail composition concerning this embodiment. It is a top view which shows the structure of the circuit board which concerns on this embodiment. It is a fragmentary longitudinal cross-sectional view of the circuit board concerning this embodiment. It is a circuit diagram which shows the circuit structure of the circuit board which concerns on this embodiment. FIG. 5A is a plan view showing a configuration of a circuit board according to a modification, FIG. 5A is a diagram according to Modification 1, and FIG. 5B is a diagram according to Modification 2. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(overall structure)
An artificial nail 10 as a light emitting device shown in FIG. 1 includes an artificial nail body 12 and a circuit board 14A. In the case of the present embodiment, the artificial nail 10 includes an adhesive layer 16, the adhesive layer 16 is the lowermost layer, a circuit board 14 </ b> A is provided on the adhesive layer 16, and the artificial nail is provided so as to cover the surface of the circuit board 14 </ b> A. A main body 12 is provided. The artificial nail 10 is formed so that light emitted from the light emitter 18A provided on the circuit board 14A can be seen through the artificial nail body 12.

  The artificial nail body 12 has a curved surface that matches the surface shape of the nail and is made of a hard synthetic resin or the like. In the case of the present embodiment, the artificial nail body 12 has transparency capable of transmitting the light emitted from the light emitter 18A. The artificial nail body 12 may be formed of a colored synthetic resin, and may be further colored with nail polish or the like. The adhesive layer 16 is not particularly limited, and for example, a double-sided tape may be used.

  As shown in FIG. 2, the circuit board 14A includes a board body 20, a coil 22 disposed on the back side of the board body 20, a light emitter 18A mounted on the surface of the board body 20, a battery 24, and an instruction unit. A microcomputer (hereinafter referred to as a microcomputer) 26, a charging display light emitter 48, and the like are provided.

  The substrate body 20 is preferably a flexible printed circuit board. The substrate body 20 preferably has a plurality of cut lines 36 drawn at the edges. The cut line 36 is drawn in a wedge shape that tapers inward from the outer peripheral edge of the substrate body 20. In the case of this embodiment, a total of five cut lines 36 are drawn, one on the tip and two on each side. By cutting the substrate body 20 along the cut line 36, the substrate body 20 can be deformed in a direction perpendicular to the substrate surface.

  The substrate body 20 is preferably drawn with a cuttable line 38. The cutable line 38 indicates the maximum range that can be cut without impairing the function according to the size of the user's nail. In the case of the present embodiment, the cuttable line 38 indicates a range in which the outer shape of the substrate body 20 is reduced, and is drawn in a shape similar to the outer shape of the substrate body 20.

  A first electrode 28 as a power electrode, a second electrode 30 and a third electrode 32 as indicator electrodes, and a fourth electrode 34 as a ground electrode are formed at the tip of the substrate body 20. The first electrode 28 and the second electrode 30 constitute an on electrode 31, and are formed such that a direct current supplied to the light emitter 18A is turned on when the user simultaneously touches with a finger. The third electrode 32 and the fourth electrode 34 constitute an off electrode 33, and are formed so that the direct current supplied to the light emitter 18A is turned off when the user simultaneously touches with a finger.

  The on electrode 31 and the off electrode 33 are formed at positions where the user can simultaneously touch only one of them with a finger. In the present embodiment, an on electrode 31 is formed on one side in the width direction of the substrate circuit, and an off electrode 33 is formed on the other side. Although not shown in FIG. 1, the artificial nail body 12 is formed so that the on electrode 31 and the off electrode 33 can be exposed from the tip portion.

  The coil 22 is formed by winding a thin wire made of, for example, copper as a conducting wire in a spiral shape or a spiral shape, and is fixed to the back surface of the substrate body 20 as shown in FIG. Both end pieces 23 of the coil 22 are drawn out to the surface side of the substrate body 20 through through holes 25 formed in the substrate body 20 (FIG. 2).

  Next, the circuit configuration of the circuit board 14A will be described with reference to FIG. The circuit board 14A includes a resonance circuit 42, a rectification circuit 44, an overvoltage protection circuit 46, a charging display light emitter 48, a charging circuit REG, a battery 24, an on / off detection circuit 50 as a switch, and a microcomputer 26. A booster circuit 52 and a light emitter 18A. The circuit board 14A is formed such that a predetermined DC voltage generated by the resonance circuit 42, the rectifier circuit 44, and the overvoltage protection circuit 46 is supplied between the power supply line L2 and the power supply line L3. The charging display light-emitting body 48 is connected to the electric wire L1 and the power supply line L3. A charging circuit REG, a battery 24, an on / off detection circuit 50, a microcomputer 26, a booster circuit 52, and a light emitter 18A are connected in parallel between the power supply line L2 and the power supply line L3.

  The resonance circuit 42 includes a coil 22 that receives magnetic flux radiated from an external magnetic flux generator (not shown), and a capacitor C <b> 1 connected in parallel to the coil 22. The resonance circuit 42 is formed to be tuned to the received magnetic flux by the coil 22 and the capacitor C1 so as to improve the reception efficiency. The resonance circuit 42 receives the magnetic flux radiated from the magnetic flux generator by the coil 22, and sends the AC voltage generated thereby to the rectifier circuit 44.

  As the magnetic flux generator, for example, a communication non-contact IC card reader / writer using near field communication (NFC) such as RFID (Radio Frequency Identification) can be used. The magnetic flux generator need not be a single function type, and a communication non-contact IC card reader / writer attached to a personal computer or a mobile phone can also be used.

  The rectifier circuit 44 converts the AC voltage generated by the resonance circuit into a DC voltage. In the present embodiment, the rectifier circuit 44 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 constitute a bridge circuit.

  The first diode D1 has an anode side connected to a first terminal P1 connected to one end of the coil 22, and a cathode side connected to the power supply line L1. The second diode D2 has a cathode side connected to a second terminal P2 connected to the other end of the coil 22, and an anode side connected to the power supply line L3. The third diode D3 has a cathode side connected to the first terminal P1, and an anode side connected to the power supply line L3. The fourth diode D4 has an anode side connected to the second terminal P2 and a cathode side connected to the power supply line L1.

  Here, when the AC voltage sent from the resonance circuit 42 is at a positive level, that is, when the voltage at the first terminal P1 is higher than that at the second terminal P2, the rectifier circuit 44 outputs the current generated thereby. It is led to the power supply line L1 by the diode D1. The current flows from the power line L1 to the various loads through the power line L2 via the overvoltage protection circuit ZD, and flows from the second diode D2 to the coil 22 through the second terminal P2 through the power line L3. On the other hand, when the AC voltage sent from the resonance circuit 42 is at a negative level, that is, when the voltage at the first terminal P1 is lower than that at the second terminal P2, the rectifier circuit 44 causes the current generated by the fourth diode It is led to the power supply line L1 by D4. The current flows from the power line L1 to the various loads through the power line L2 via the overvoltage protection circuit ZD, and flows from the third diode D3 to the coil 22 through the first terminal P1 through the power line L3.

  The overvoltage protection circuit ZD protects the charging circuit REG from the overvoltage because the charging circuit REG may be damaged if the voltage generated by the resonance circuit 42 becomes too high. In the present embodiment, a Zener diode can be used for the overvoltage protection circuit ZD. The cathode side of the Zener diode is connected to L1, and the anode side is connected to L3. The overvoltage protection circuit ZD operates so that the cathode side voltage becomes a predetermined voltage. Thereby, various loads provided in the next stage of the overvoltage protection circuit ZD, that is, the charging display light emitter 48, the charging circuit REG, the battery 24, the on / off detection circuit 50, the microcomputer 26, and the booster circuit 52 A stable DC voltage is supplied to the light emitter 18A.

  The charging display light-emitting body 48 has a resistor R2 connected to the anode side and a power line L3 connected to the cathode side.

  The charging circuit REG is connected in parallel with the battery 24 provided in the next stage. In the case of this embodiment, the charging circuit REG can use a capacitor, and generates electric power for charging the battery 24 while accumulating electric charge by the voltage applied via the overvoltage protection circuit ZD. The charging circuit REG supplies the generated charging power to the battery 24 and charges the battery 24 at a constant voltage.

  The battery 24 is connected in parallel with the charging circuit REG via a backflow prevention diode D5, and includes at least one type of secondary battery that matches the operating time. The battery 24 may be a high-capacity lithium ion secondary battery B1 having a long operation time, but is not particularly limited. For example, a small-capacity capacitor-type secondary battery B2, which has an operation time of about several minutes, is used. B3 can also be used.

  The on / off detection circuit 50 includes an on electrode 31 and an off electrode 33 connected in series. The on electrode 31 includes a first electrode 28 and a second electrode 30. The off electrode 33 includes a third electrode 32 and a fourth electrode 34. The first electrode 28 is connected to the power supply line L2. The second electrode 30 and the third electrode 32 are connected to the microcomputer 26 as an instruction unit via the field effect transistor FET2. In practice, the midpoint of the second electrode 30 and the third electrode 32 is connected to the gate of the field effect transistor FET2. The fourth electrode 34 is connected to the power supply line L3. A resistor R8 and a capacitor C4 are connected in parallel with the third electrode 32 and the fourth electrode 34, respectively. The field effect transistor FET2 has a drain connected to the power supply line L3.

  The on / off detection circuit 50 applies a voltage to the capacitor C4 by the battery 24 when the first electrode 28 and the second electrode 30 are electrically connected. Thereby, the capacitor C4 stores electric charges. The capacitor C4 applies a voltage to the gate of the field effect transistor FET2 by this charge. When the voltage applied to the gate exceeds the threshold value, the field effect transistor FET2 enters an on state in which a current flows between the source and the drain. Once the field effect transistor FET2 is turned on, it remains on while the gate voltage is held above the threshold voltage by the capacitor C4 even if the first electrode 28 and the second electrode 30 are electrically disconnected. Hold.

  On the other hand, when the third electrode 32 and the fourth electrode 34 are electrically connected, the on / off detection circuit 50 releases the charge stored in the capacitor C4. Thus, when the voltage applied to the gate falls below the threshold, the field effect transistor FET2 enters an off state in which the current between the source and the drain is stopped.

  In the case of this embodiment, the resistor R8 functions as an automatic off timer that prevents forgetting to cut by discharging the charge stored in the capacitor C4.

  The microcomputer 26 is constituted by a CPU, a ROM, a RAM, and the like. The microcomputer 26 performs overall control of the entire circuit by executing the basic program stored in the ROM on the RAM, and also executes various programs by expanding the program stored in the ROM on the RAM and executing the program. Run.

  In the microcomputer 26, the power supply line L2 is connected to the terminal Vdd. The terminal Vss is connected to the power supply line L3 via the field effect transistor FET2.

  A booster circuit 52 is connected to a terminal RA4 of the microcomputer 26. The booster circuit 52 includes a capacitor C5, a diode D6, a diode D7, and a capacitor C6. One end of the capacitor C5 is connected to a terminal RA4 of the microcomputer 26. The other end side of the capacitor C5 is connected to the anode side of the diode D7. The cathode side of the diode D7 is connected to the capacitor C6. A midpoint P3 (Vdd2) between the diode D7 and the capacitor C6 is connected to the light emitter 18A. The middle point of the capacitor C5 and the diode D7 is connected to the cathode side of the diode D6 whose anode side is connected to the power supply line L2.

  A voltage is applied from the battery 24 to the middle point P3 between the diode D7 and the capacitor C6 via the diode D6. The capacitor C5 accumulates electric charges by a rectangular wave output that repeats a high potential and a low potential output from the terminal RA4 of the microcomputer 26. The booster circuit 52 generates a high voltage by shifting the potential at the midpoint P3 (Vdd2) by the amount of charge stored in the capacitor C5 at the moment when the rectangular wave output is switched to a high potential. The voltage generated in this way is stored in the capacitor C6.

  The light emitter 18A is composed of LEDs, and in the case of this embodiment, the light emitter 18A has three LEDs composed of red, green, and blue. Each LED has an anode side connected to a capacitor C6 through a middle point P3 (Vdd2), and a cathode side through field resistors R9, R10, and R11, field effect transistor FET3, field effect transistor FET4, and field effect. The transistor FET5 is connected to the source. The field effect transistor FET3, field effect transistor FET4, and field effect transistor FET5 have their gates connected to terminals RA1, RA2, and RA5 of the microcomputer 26, respectively, and their drains are grounded.

  In the microcomputer 26, when the FET 2 is turned on, Vss is connected to the power supply line L3. Thereby, the microcomputer 26 outputs a predetermined lighting signal from the terminals RA1, RA2, and RA5. By the lighting signal, the field effect transistor FET3, the field effect transistor FET4, and the field effect transistor FET5 are turned on so that a current flows between the source and the drain. When the field effect transistor FET3, the field effect transistor FET4, and the field effect transistor FET5 are in the on state, a current flows from the capacitor C6 to the corresponding LED through the middle point P3 (Vdd2). Thereby, the light emitter 18A emits light.

  On the other hand, when the current flowing through the power supply line L4 stops, the microcomputer 26 stops the lighting signal output from the terminals RA1, RA2, and RA5. Thereby, the field effect transistor FET3, the field effect transistor FET4, and the field effect transistor FET5 are turned off to stop the current between the source and the drain, and the light emitter 18A is turned off.

(Function and effect)
In the above configuration, the artificial nail 10 receives the magnetic flux supplied from the magnetic flux generator by the coil by being brought close to the magnetic flux generator or contacting the surface of the magnetic flux generator, thereby generating a voltage to generate a battery. 24 charging starts. At this time, the artificial nail 10 lights up the charging display light-emitting body 48 to indicate that charging has started. In this way, the artificial nail 10 receives the magnetic flux supplied from the outside via the coil 22 to generate a voltage and charges the battery 24 with the voltage. Can be realized.

  In the case of the present embodiment, the resonance circuit 42 can be charged regardless of the type of the magnetic flux generator, so that convenience can be improved. Further, since the artificial nail 10 includes the overvoltage protection circuit ZD, it can be charged without damaging the charging circuit REG.

  Next, the user fixes the artificial nail 10 to his nails through the adhesive layer 16. At this time, the circuit board 14A can be fixed in close contact with the user's nails because the board body 20 is cut by the cut lines 36 and can be deformed according to the surface shape of the artificial nail body 12.

  When the user touches the ON electrode 31 with a finger, a current flows from the first electrode 28 to the second electrode 30 via the finger. When the voltage applied to the gate exceeds the threshold value, the field effect transistor FET2 enters an on state in which a current flows between the source and the drain. Then, the microcomputer 26 outputs a predetermined lighting signal from the terminals RA1, RA2, and RA5. In this way, the light emitter 18A is turned on. The timing, time, and the like for turning on the light emitter 18A can be controlled by a program stored in the microcomputer 26 in advance.

  Further, when the user touches the off electrode 33 with a finger, a current flows from the third electrode 32 to the fourth electrode 34 via the finger. When the voltage applied to the gate falls below the threshold value, the field effect transistor FET2 is turned off to stop the current between the source and the drain. As a result, the power supply line L4 and the power supply line L3 are electrically disconnected, and the microcomputer 26 stops its operation. Then, the microcomputer 26 stops a predetermined lighting signal from the terminals RA1, RA2, and RA5. In this way, the light emitter 18A is turned off. Therefore, the artificial nail 10 can turn on the light emitter 18A only when the user needs it, and can turn off the light when not in use, thereby suppressing battery consumption.

  In the case of the present embodiment, the light emitter 18A is turned on or off using the human body resistance of the user. Therefore, since the artificial nail 10 does not need to use a mechanical switch, it can be reduced in size. Furthermore, since the booster circuit 52 uses the rectangular wave output of the microcomputer 26, the number of parts can be reduced, and thus downsizing can be realized more reliably.

(Modification)
The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the gist of the present invention. For example, in the case of the above embodiment, the artificial nail 10 has the adhesive layer 16 as the lowermost layer, the circuit board 14A is provided on the adhesive layer 16, and the artificial nail body 12 is provided so as to cover the surface of the circuit board 14A. However, the present invention is not limited to this. The artificial nail 10 may have the adhesive layer 16 as the lowermost layer, the artificial nail body 12 provided on the adhesive layer 16, and the circuit board 14 </ b> A provided on the artificial nail body 12.

  Further, the artificial nail 10 does not necessarily have to include the adhesive layer 16, and when fixing to the nail, an adhesive may be applied to the nail and the artificial nail 10 may be fixed to the nail via the adhesive. .

  In the case of the above embodiment, the case where the light emitter 18A is a three-color LED has been described, but the present invention is not limited to this. The light emitter 18A may be monochromatic. As shown in FIG. 5A, the circuit board 14B may include a light emitter 18B in which a plurality of LEDs are arranged at predetermined positions. Thereby, since the light emitter 18B can form a predetermined shape as a whole, the degree of freedom in design can be improved. Further, as illustrated in FIG. 5B, the circuit board 14 </ b> C may be configured such that the light emitter 18 </ b> C further includes a linear light guide. The light emitter 18C can guide the LED light to the light guide to form a predetermined shape as a whole.

  In the case of the above embodiment, the case where the light emitting device is applied to the artificial nail 10 has been described. However, the present invention is not limited to this, and various decorative items that can be worn such as a necklace, earrings, and a seal for face painting. You may apply to.

  In the case of the above-described embodiment, the coil 22 has been described with respect to the case where the conductive wire is wound spirally or spirally and fixed to the back surface of the substrate body 20, but the present invention is not limited thereto. For example, the coil may form a coil pattern directly on the back surface of the substrate body 20. Alternatively, a coil pattern may be formed on a flexible substrate different from the substrate body 20 and the flexible substrate may be fixed to the back surface of the substrate body 20.

10 False nails (light emitting device)
12 artificial nail body 14A circuit board 18A light emitter 20 substrate body 22 coil 24 battery 26 microcomputer (instruction part)
28 1st electrode (power supply electrode)
30 Second electrode (indicator electrode)
32 Third electrode (indicator electrode)
34 Fourth electrode (ground electrode)
36 Cut line 38 Cuttable line 42 Resonant circuit 44 Rectifier circuit ZD Overvoltage protection circuit 50 On-off detection circuit (switch)
REG charging circuit

Claims (5)

A resonant circuit that generates a voltage based on the magnetic flux received through the coil;
A charging circuit that charges the battery with the voltage generated by the resonant circuit;
A light emitter that emits light by a direct current supplied from the battery ;
A switch for turning on and off a direct current supplied to the light emitter using a resistance of a human body ,
The switch is
A first electrode as a power supply electrode connected to the battery, a second electrode and a third electrode as indicator electrodes connected to an indicator for instructing on / off of the light emitter, and a fourth as a grounded ground electrode An electrode, the first electrode and the second electrode constitute an on-electrode, the third electrode and the fourth electrode constitute an off-electrode,
Emitting device wherein on electrode on one side in the width direction of the circuit board on which the charging circuit is provided, characterized that you have the off-electrode is formed on the other side. The light-emitting device according to claim 1, further comprising an overvoltage protection circuit that limits a voltage applied to the charging circuit to a predetermined value or less. Artificial nail, characterized by comprising the light-emitting device according to claim 1 or 2, wherein. Before SL circuit board, nail according to claim 3, wherein the score lines are drawn on the edge. 5. The artificial nail according to claim 4 , wherein a part of the circuit board is cut out based on the cut line and is deformed according to a surface shape of the nail.

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