JP7226146B2 - illumination device - Google Patents

Description

The technical field of the present specification relates to illumination devices.

Various illumination devices are sometimes used in commercial facilities and the like. This is to decorate the interior of the commercial facility and create an atmosphere. Also, large-scale illumination devices are used at tourist spots in order to encourage more tourists to visit them.

In recent years, LEDs have come to be used in illumination devices. This is because the amount of heat generated by the LED is small, and energy saving can be achieved. For example, Patent Literature 1 discloses an illumination device in which LEDs are arranged in the center of petals of artificial flowers. A technique of attaching artificial leaves to wiring for supplying power to LEDs is disclosed (paragraph [0009] of Patent Document 1).

JP 2012-79668 A

If the illumination device has wiring, the freedom of decoration is restricted. In addition, the wiring itself is not necessarily glamorous. Therefore, the wiring can be a factor that hinders the presentation by the illumination device.

The problem to be solved by the technique of the present specification is to provide an illumination device that does not have wiring.

In one aspect of the present invention, a plurality of power-receiving-side units each including a light-emitting element and a power-receiving coil that supplies power to the light-emitting element;
a power transmission side unit including a plurality of first power transmission coils that supply power to each of the power reception coils of the plurality of power reception side units, and a second power transmission coil that supplies power to the plurality of power reception side units;
has
The power transmission side unit
a first power transmission side capacitor connected in series to each of the plurality of first power transmission coils and having an invariable capacitance ;
a second power transmission side capacitor connected in series with the second power transmission coil and having a continuously variable capacitance;
The plurality of power receiving units,
a power receiving capacitor connected in series to each of the plurality of power receiving coils;
Resonance frequencies of the plurality of first power transmission coils and the plurality of first power transmission side capacitors are different,
The plurality of first power transmission coils are capable of transmitting power simultaneously,
At least one of the plurality of first power transmission coils and the second power transmission coil are capable of transmitting power simultaneously,
The plurality of power receiving units,
The illumination device is capable of receiving power in resonance frequency bands in which the resonance frequencies, which are the medians of the resonance frequency bands, do not match each other.

In this illumination device, the light emitting elements and the power receiving coils are in one-to-one correspondence. The illumination device can independently illuminate the light-emitting elements of the power-receiving-side unit by wireless power supply. Therefore, the power-receiving-side unit does not require a switching device for switching which light-emitting element is to be supplied with power. Therefore, the size of the power receiving unit can be reduced.

An illumination device having no wires is provided herein.

1 is a conceptual diagram showing a schematic configuration of an illumination device according to a first embodiment; FIG. It is a figure which shows typically the circuit of the wireless electric power feeding system in the illumination apparatus of 1st Embodiment. 1 is a graph illustrating the relationship between frequency and light output of an LED; 4 is a graph showing the relationship between frequency and light output in each light emitting unit of the illumination device of the first embodiment; It is a conceptual diagram which shows schematic structure of the illumination device of 2nd Embodiment. FIG. 10 is a diagram schematically showing the circuit of the wireless power supply system in the illumination device of the second embodiment; It is a graph which shows the relationship of the resonance frequency in the illumination device of 2nd Embodiment. It is a conceptual diagram which shows schematic structure of the illumination device of 3rd Embodiment. FIG. 11 is a diagram schematically showing a circuit of a wireless power supply system in an illumination device of a third embodiment; FIG. It is a figure explaining the structure of the light-emitting body of 4th Embodiment. FIG. 12 is a conceptual diagram illustrating the structure of a controller according to the fourth embodiment; FIG. It is a conceptual diagram of the illumination system of 4th Embodiment. FIG. 11 is a diagram (part 1) showing the illumination system according to the fourth embodiment during light emission; FIG. 12 is a diagram (part 2) showing the lighting of the illumination system of the fourth embodiment; It is a figure explaining the structure of the light-emitting body in the modification of 4th Embodiment. FIG. 12 is a graph showing the relationship between frequency and light output in each light emitting unit of the illumination system in a modification of the fourth embodiment; FIG. FIG. 11 is a diagram (part 1) for explaining the structure of a light emitter in a modified example of the fourth embodiment; FIG. 12 is a diagram (part 2) for explaining the structure of a light emitter in a modified example of the fourth embodiment;

Specific embodiments will be described below by taking an illumination device, a light emitter, and a controller as examples. However, the technology herein is not limited to these embodiments.

(First embodiment)
1. Illumination Device FIG. 1 is a conceptual diagram showing a schematic configuration of an illumination device 100 according to the first embodiment.

As shown in FIG. 1, the illumination device 100 has a power transmission side unit ET1, a first light emitting unit EU1, a second light emitting unit EU2, and a third light emitting unit EU3.

The power transmission side unit ET1 has power transmission coils 110a, 110b, and 110c, power transmission circuits 130a, 130b, and 130c, and a control section 160. Further, as will be described later, the power transmitting unit ET1 has capacitors connected in series to each of the power transmitting coils 110a, 110b, and 110c. As will be described later, this power transmission side capacitor is a capacitor whose capacitance does not change. The power transmission side unit ET1 can simultaneously transmit power at a plurality of frequencies.

The first light emitting unit EU1 has a power receiving coil 120a, a power receiving circuit 140a, and an LED 150a. The second light emitting unit EU2 has a power receiving coil 120b, a power receiving circuit 140b, and an LED 150b. The third light emitting unit EU3 has a power receiving coil 120c, a power receiving circuit 140c, and an LED 150c. The first light emitting unit EU1, the second light emitting unit EU2, and the third light emitting unit EU3 are independent of each other and emit light separately.

The first light emitting unit EU1, the second light emitting unit EU2, and the third light emitting unit EU3 are power receiving units. Thus, the power receiving unit has LEDs 150a, 150b, 150c and power receiving coils 120a, 120b, 120c. The plurality of power-receiving-side units can receive power in resonance frequency bands in which the resonance frequencies, which are medians of the resonance frequency bands, do not match each other.

The LEDs 150a, 150b, and 150c are semiconductor light emitting elements that emit light of different wavelengths. For example, LED 150a produces red light, LED 150b produces green light, and LED 150c produces blue light. The LEDs 150a, 150b, 150c may emit light at different times and at different intensities.

Thus, the illumination device 100 includes power transmitting coils 110a, 110b, and 110c, power receiving coils 120a, 120b, and 120c, power transmitting circuits 130a, 130b, and 130c, power receiving circuits 140a, 140b, and 140c, and LEDs 150a, 150b, and 150c. , and a control unit 160 .

2. Wireless Power Supply System The power transmission side unit ET1, the first light emitting unit EU1, the second light emitting unit EU2, and the third light emitting unit EU3 constitute a wireless power supply system. The wireless power supply system includes power transmitting coils 110a, 110b, and 110c, power receiving coils 120a, 120b, and 120c, power transmitting circuits 130a, 130b, and 130c, power receiving circuits 140a, 140b, and 140c, and a controller 160.

The resonance frequency f1t on the power transmitting side of the first light emitting unit EU1 and the resonance frequency f1r on the power receiving side of the first light emitting unit EU1 are the same frequency f1 in design. The resonant frequency f2t on the power transmission side of the second light emitting unit EU2 and the resonant frequency f2r on the power receiving side of the second light emitting unit EU2 are the same frequency f2 in design. The resonant frequency f3t on the power transmitting side of the third light emitting unit EU3 and the resonant frequency f3r on the power receiving side of the third light emitting unit EU3 are the same frequency f3 in design. The frequencies f1, f2, and f3 are, for example, 500 kHz or more and 15 MHz or less.

The resonance frequency f1 of the first light-emitting unit EU1, the resonance frequency f2 of the second light-emitting unit EU2, and the resonance frequency f3 of the third light-emitting unit EU3 are different frequencies, and the values of these frequencies f1, f2, and f3 are sufficient. away from Therefore, for example, when the power transmitting coil 110a of the first light emitting unit EU1 transmits power to the power receiving coil 120a at the resonance frequency f1t, the power is transmitted to the power receiving coil 120b of the second light emitting unit EU2 and the power receiving coil 120c of the third light emitting unit EU3. Very little.

The power transmitting coils 110a, 110b, and 110c are coils for forming magnetic fields around the power receiving coils 120a, 120b, and 120c, respectively. The power transmitting coils 110a, 110b, and 110c supply power to the power receiving coils 120a, 120b, and 120c, respectively. The power transmission coils 110a, 110b, and 110c are connected in series with capacitors described later. The power transmission coils 110a, 110b, and 110c are made of wires. Wires include, for example, single wires and litz wires. Examples of the material of the power transmission coils 110a, 110b, and 110c include copper. The power transmission coils 110a, 110b, and 110c are air cores. The number of turns of the power transmission coils 110a, 110b, and 110c is preferably 1 or more and 3 or less. Of course, it is not limited to this numerical range. In addition, in FIG. 1, the number of turns of the power transmission coils 110a, 110b, and 110c is one.

The surfaces surrounded by the power transmission coils 110a, 110b, and 110c are flat. That is, the power transmission coils 110a, 110b, and 110c have planar shapes positioned on one plane. A plane surrounded by the power transmission coils 110a, 110b, and 110c is defined as an xy plane. The z-axis is taken in a direction perpendicular to the plane surrounded by the power transmission coils 110a, 110b, and 110c.

The length of the power transmission coil 110 in the x-axis direction is, for example, 10 mm or more and 400 mm or less. It is good in it being 50 mm or more and 100 mm or less. The length of the power transmission coil 110 in the y-axis direction is, for example, 10 mm or more and 400 mm or less. It is good in it being 50 mm or more and 100 mm or less. The length of the power transmission coil 110 in the z-axis direction is, for example, 0.5 mm or more and 10 mm or less. These numerical ranges are guidelines, and numerical values other than the above may be used.

The power receiving coils 120a, 120b and 120c are for supplying power to the LEDs 150a, 150b and 150c to drive the LEDs 150a, 150b and 150c, respectively. The power receiving coils 120a, 120b, and 120c generate currents by the magnetic fields formed by the power transmitting coils 110a, 110b, and 110c, respectively. In this way, the power receiving coils 120a, 120b, 120c are powered from the power transmitting coils 110a, 110b, 110c. The receiving coils 120a, 120b, and 120c are connected in series with capacitors described later. The receiving coils 120a, 120b, and 120c are made of wire. Wires include, for example, single wires and litz wires. Examples of the material of the power receiving coils 120a, 120b, and 120c include copper. The number of turns of the power receiving coils 120a, 120b, and 120c is preferably 1 or more and 3 or less. Of course, it is not limited to this numerical range. In addition, in FIG. 1, the number of turns of the receiving coils 120a, 120b, and 120c is one.

The area of the surface surrounded by one turn of the power receiving coils 120a, 120b, and 120c is sufficiently smaller than the area of the surface surrounded by one turn of the power transmitting coils 110a, 110b, and 110c. The ratio of the surface area surrounded by power receiving coils 120a, 120b, and 120c to the surface area surrounded by power transmitting coils 110a, 110b, and 110c is about 1/10 or more and 1/2 or less. It is only a guideline, and numerical values other than the above may be used.

The power transmission circuits 130a, 130b, and 130c are circuits for oscillating AC voltages to be supplied to the power transmission coils 110a, 110b, and 110c, respectively. For example, power transmission circuits 130a, 130b, and 130c each generate an alternating current of 6.78 MHz. These frequencies may be different from each other.

The power receiving circuits 140a, 140b, and 140c are circuits for converting currents flowing through the power receiving coils 120a, 120b, and 120c into currents suitable for the LEDs 150a, 150b, and 150c, respectively. Specifically, the AC voltages of the receiving coils 120a, 120b, 120c are converted into DC voltages for driving the LEDs 150a, 150b, 150c. The power receiving circuits 140a, 140b, and 140c may have other functions such as rectifying circuits.

The control unit 160 independently controls the power transmission circuits 130a, 130b, and 130c. Therefore, the control unit 160 can cause the LEDs 150a, 150b, and 150c to emit light independently. Control unit 160 executes other controls.

3. Circuit of Wireless Power Supply System FIG. 2 is a diagram schematically showing a circuit of the wireless power supply system of the illumination device 100 of the first embodiment. As shown in FIG. 2, the power transmission coil 110a forms an LC series circuit together with the capacitor C1. Capacitor C1 is a power transmission side capacitor. The power transmission side unit ET1 has a power transmission side capacitor connected in series with the power transmission coil 110a.

Power receiving coil 120a forms an LC series circuit together with capacitor C2. A capacitor C2 is a power receiving side capacitor. The plurality of power receiving units have power receiving capacitors connected in series to the power receiving coil 120a. As described above, the circuit is designed such that the resonant frequency of the LC series circuit on the power transmitting coil 110a side and the resonant frequency of the LC series circuit on the power receiving coil 120a side are equal.

The power transmission coil 110b forms an LC series circuit together with the capacitor C3. Power receiving coil 120b forms an LC series circuit together with capacitor C4. As described above, the circuit is designed such that the resonant frequency of the LC series circuit on the power transmitting coil 110b side and the resonant frequency of the LC series circuit on the power receiving coil 120b side are equal.

The power transmission coil 110c forms an LC series circuit together with the capacitor C5. The receiving coil 120c forms an LC series circuit together with the capacitor C6. As described above, the circuit is designed such that the resonant frequency of the LC series circuit on the power transmitting coil 110c side and the resonant frequency of the LC series circuit on the power receiving coil 120c side are equal.

The power transmission output in the wireless power supply system 100 is 10 W or less. For example, 5W. The voltage driving the LEDs 150a, 150b, 150c is, for example, 5V. Of course, numerical values other than the above may be used. The current flowing through the LEDs 150a, 150b, 150c is 1 mA or less. Of course, numerical values other than the above may be used.

Note that in FIG. 2, the capacitors C1, C3, and C5 are depicted as being outside the power transmission circuits 130a, 130b, and 130c, respectively. FIG. 2 is conceptual and capacitors C1, C3, C5 may be in transmission circuits 130a, 130b, 130c, respectively. Similarly, capacitors C2, C4, C6 may be in power receiving circuits 140a, 140b, 140c, respectively.

4. Resonance frequency The resonance frequency is uniquely determined by the combination of the inductance of the coil and the capacitance of the capacitor.

FIG. 3 is a graph illustrating the relationship between frequency and light output of an LED. The horizontal axis of FIG. 3 is the frequency determined by the combination of the inductance of the coil and the capacitance of the capacitor. The vertical axis in FIG. 3 is the light output of the LED.

As shown in FIG. 3, the light output of the LED takes a maximum value of 1 at the resonance frequency f. Then, the light output of the LED decreases as the frequency deviates from the resonance frequency f. When the frequency deviates from the resonant frequency f by Δf, the light output of the LED becomes zero. Even if the frequency deviates somewhat from the resonance frequency f, wireless power feeding is effective to some extent. That is, the LED lights up.

Thus, the frequency band within the range of the resonance frequency f±Δf is the power-suppliable frequency band fb1. For example, assume the resonant frequency f is 6.78 MHz. In this case, Δf is, for example, 0.2 MHz.

FIG. 4 is a graph showing the relationship between frequency and light output in each light emitting unit of the illumination device 100 of the first embodiment. The horizontal and vertical axes of FIG. 4 are the same as the horizontal and vertical axes of FIG.

As shown in FIG. 4, the resonant frequencies f1, f2, f3 are sufficiently separated from each other. Therefore, the first light emitting unit EU1, the second light emitting unit EU2, and the third light emitting unit EU3 can be caused to emit light independently.

Table 1 shows the light emission mode of each light emitting unit in the illumination device 100 of the first embodiment. "0" indicates that the light emitting unit is not emitting light, and "1" indicates that the light emitting unit is emitting light at maximum output.

As shown in Table 1, the illumination device 100 can cause only one of the first light emitting unit EU1, the second light emitting unit EU2, and the third light emitting unit EU3 to emit light. Also, the illumination device 100 can cause two of the three light emitting units to emit light. Of course, the illumination device 100 can cause all the light emitting units to emit light. For example, the leftmost column in Table 1 indicates the case where all light emitting units are turned off, the second column from the left in Table 1 indicates the case where only the first light emitting unit EU1 is turned on, The rightmost column of Table 1 shows the case where all light emitting units are lit.

[Table 1]
First light emitting unit 0 1 0 0 1 1
Second light emitting unit 0 0 1 0 1 1
Third light emitting unit 0 0 0 1 0 1
"0": Off, "1": On

5. Effect of First Embodiment In the illumination device 100 of the first embodiment, the LEDs and the power receiving coils are in one-to-one correspondence. Also, the power receiving coil and the power transmitting coil are in one-to-one correspondence. Therefore, the illumination device 100 can easily illuminate a plurality of LEDs by wireless power supply.

In addition, the illumination device 100 can cause the first light emitting unit EU1, the second light emitting unit EU2, and the third light emitting unit EU3 to emit light independently. In addition, there is no risk of adversely affecting other LEDs than the LED to emit light during wireless power supply.

No circuit switching device is required on the receiving side of the LEDs 150a, 150b, 150c, etc. Therefore, the size of the light emitter on the power receiving side can be reduced.

When adopting a configuration other than the configuration of the first embodiment, it is necessary to transmit and receive a switching signal for switching which LED to supply power to. That is, the power receiving side in this case has a switching signal transmitting section and a switching signal receiving section. The switching signal receiver has, for example, an inverter. Therefore, the size of the device on the power receiving side is increased.

6. Modification 6-1. Number of LEDs The illumination device 100 of the first embodiment has three LEDs. However, the illumination device 100 may have two LEDs or multiple LEDs. It may also have a white light LED.

6-2. Power Transmitting Coil and Power Receiving Coil Power receiving coils 120a, 120b, and 120c may have two or more turns. At that time, it is preferable to wind the coil so as to stack the coils in the z-axis direction perpendicular to the plane surrounded by the coils, instead of winding the coils so that the coils fit within the same plane. Similarly, the number of turns of the power transmission coils 110a, 110b, and 110c may also be changed. Further, the power transmitting coils 110a, 110b, 110c and the power receiving coils 120a, 120b, 120c may be shaped like a square.

6-3. Sound Generating Unit The illumination device 100 may have a sound generating unit that generates sound on the power receiving side. The power receiving coils 120a, 120b, and 120c supply power to the sound generator. In that case, music can be generated in accordance with the brilliance of light from the illumination device 100 .

6-4. Combination The above modifications may be freely combined.

(Second embodiment)
A second embodiment will be described.

1. Illumination Device FIG. 5 is a conceptual diagram showing a schematic configuration of an illumination device 200 according to the second embodiment. As shown in FIG. 5, the illumination device 200 has a first light emitting unit EU1, a second light emitting unit EU2, a third light emitting unit EU3, and a power transmission side unit ET2. The first light emitting unit EU1, the second light emitting unit EU2, and the third light emitting unit EU3 are the same as in the first embodiment. The power transmission side unit ET2 has a power transmission coil 210, a power transmission circuit 230, and a control section 260.

Power transmission coil 210 is a coil for forming a magnetic field around each of power reception coils 120a, 120b, and 120c. Therefore, the power transmitting coil 210 of the second embodiment is larger than the power transmitting coils 110a, 110b, 110c of the first embodiment. That is, the area of the surface surrounded by the power transmission coil 210 of the second embodiment is larger than the area of the surface surrounded by the power transmission coils 110a, 110b, and 110c of the first embodiment.

The power transmission circuit 230 is a circuit for oscillating an AC voltage to be supplied to the power transmission coil 210 .

2. Circuit of Wireless Power Supply System FIG. 6 is a diagram schematically showing a circuit of a wireless power supply system in the illumination device 200 of the second embodiment. As shown in FIG. 6, the illumination device 200 has a variable capacitor C7. The variable capacitor C7 is a capacitor whose capacitance can be changed over time. The power transmission coil 210 forms an LC series circuit together with the variable capacitor C7. Thus, the power transmission side ET2 unit has a variable capacitance capacitor as a power transmission side capacitor.

The controller 260 changes the capacitance of the variable capacitor C7 according to time.

3. Resonance Frequency Since the capacitance of the variable capacitor C7 changes with time, the resonance frequency of the power transmission coil 210 side changes with time. Thus, in the second embodiment, the resonance frequency on the power receiving side is fixed, whereas the resonance frequency on the power transmission side is variable.

Table 2 shows the light emission mode of each light emitting unit in the illumination device 200 of the second embodiment. As shown in Table 2, any one of the first light emitting unit EU1, the second light emitting unit EU2, and the third light emitting unit EU3 emits light. In this case, two or more types of light-emitting units do not emit light at the same time. The power transmission side unit ET2 can transmit power to the power receiving coils 120a, 120b, and 120c at one frequency.

FIG. 7 is a graph showing the relationship of resonance frequencies in the illumination device 200 of the second embodiment. As shown in FIG. 7, it is assumed that the resonance frequency on the power transmission side is frequency fi at a certain time. In this case, since the frequency fi is slightly shifted from the resonance frequency f2, the current flowing through the receiving coil 120b is about half. Therefore, the LED 150b of the second light-emitting unit EU2 emits light with a brightness about half of the maximum output. Thus, in the second embodiment, the brightness of the LEDs 150a, 150b, 150c can be controlled.

[Table 2]
First light emitting unit 0 1 0 0 0 0.3
Second light emitting unit 0 0 1 0 0.5 0
Third light emitting unit 0 0 0 1 0 0
"0": off, other than "0": on

4. Modifications Modifications of the first embodiment can be applied to the second embodiment.

(Third embodiment)
A third embodiment will be described. The third embodiment is a combination of the first and second embodiments.

1. Illumination Device FIG. 8 is a conceptual diagram showing a schematic configuration of an illumination device 300 according to the third embodiment. As shown in FIG. 8, the illumination device 300 has a first light emitting unit EU1, a second light emitting unit EU2, a third light emitting unit EU3, and a power transmission side unit ET3. The power transmission side unit ET3 has power transmission coils 110 a , 110 b , 110 c and 210 , power transmission circuits 130 a , 130 b , 130 c and 230 and a control section 360 .

The first light emitting unit EU1, the second light emitting unit EU2, and the third light emitting unit EU3 are the same as in the first embodiment. The power transmission coils 110a, 110b, 110c and the power transmission circuits 130a, 130b, 130c are the same as in the first embodiment. The power transmission coil 210 and the power transmission circuit 230 are the same as in the second embodiment.

2. Circuit of Wireless Power Supply System FIG. 9 is a diagram schematically showing a circuit of a wireless power supply system in the illumination device 300 of the third embodiment. As shown in FIG. 9, the illumination device 300 has a variable capacitor C7. The power transmission coil 210 forms an LC series circuit together with the variable capacitor C7. The control unit 360 controls the power transmission circuits 130a, 130b, 130c, and 230 while changing the capacitance of the variable capacitor C7 according to the time.

3. Resonance Frequency Table 3 shows the light emission mode of each light emitting unit in the illumination device 300 of the third embodiment. As shown in Table 3, the illumination device 300 can cause one or more of the first light emitting unit EU1, the second light emitting unit EU2, and the third light emitting unit EU3 to emit light. Also, the brightness of each light emitting unit can be adjusted.

[Table 3]
First light emitting unit 0 1 0 0 1 1
Second light emitting unit 0 0 1 0 0.4 1
Third light emitting unit 0 0 0 1 0 0.6
"0": off, other than "0": on

Control unit 360 can simultaneously execute the first control and the second control. The first control controls the current flowing through each of the power transmission coils 110a, 110b, and 110c. The first control discontinuously changes the frequency of the power transmission side unit ET3. The second control controls the current flowing through power transmission coil 210 and changes the capacitance of variable capacitor C7. The second control continuously changes the frequency of the power transmission side unit ET3. Therefore, the power transmission side unit ET3 can simultaneously transmit power at two types of frequencies, a frequency that changes discontinuously and a frequency that changes continuously.

4. Modification 4-1. Transmitting Coils The number of transmitting coils 210 connected in series with the variable capacitors may be increased. For example, if there are the same number of power transmission coils 210 as the types of light emitting units, the brightness of all types of light emitting units can be adjusted.

A modification of the first embodiment can be applied to the third embodiment.

(Fourth embodiment)
A fourth embodiment will be described.

1. Light Emitting Body FIG. 10 is a diagram for explaining the structure of the light emitting body EB1 of the fourth embodiment. As shown in FIG. 10, the light emitter EB1 has a power receiving coil 420, a power receiving circuit 440, an LED 450, a resin 470, and an outermost layer 471. As shown in FIG. Light emitter EB1 has a capacitor connected in series with receiving coil 420 . The light emitter EB1 is an object in which an LED 450 is sealed with a resin 470. FIG.

The receiving coil 420 is the same coil as any of the receiving coils 120a, 120b, and 120c of the first embodiment. The power receiving circuit 440 is a circuit similar to any one of the power receiving circuits 140a, 140b, and 140c of the first embodiment. The LED 450 is a light emitting element similar to any one of the LEDs 150a, 150b, 150c of the first embodiment. The diameter of power receiving coil 420 is, for example, about 1 cm. Therefore, the size of the light emitter EB1 can be made sufficiently small.

Resin 470 is a sealing resin that seals power receiving coil 420 , power receiving circuit 440 , and LED 450 . Resin 470 covers power receiving coil 420 , power receiving circuit 440 and LED 450 . Resin 470 is a transparent material. This is for extracting the light from the LED 450 to the outside.

The outermost layer 471 is the outermost layer of the light emitter EB1. The outermost layer 471 is the surface of the resin 470 . Alternatively, a resin harder than the resin 470 may be used. The outermost layer 471 is spherical. Therefore, the light emitter EB1 is a sphere.

The light emitter EB1 has the same configuration as the first light emitting unit EU1, the second light emitting unit EU2, and the third light emitting unit EU3 of the first embodiment. Light emitter EB1 does not have a power transmission coil. Therefore, the light emitter EB1 cannot emit light by itself. The light emitter EB1 emits light by wirelessly supplying power to the light emitter EB1 through the configuration on the power transmission side.

2. Controller FIG. 11 is a conceptual diagram illustrating the structure of the controller Ctr1 of the fourth embodiment. As shown in FIG. 11, the controller Ctr1 has the power transmission side configuration of the third embodiment. The controller Ctr1 has power transmission coils 110 a , 110 b , 110 c and 210 , power transmission circuits 130 a , 130 b , 130 c and 230 and a controller 360 . The controller Ctr1 also has a capacitor connected in series with each of the power transmission coils 110a, 110b, 110c, and 210. FIG. The controller Ctr1 is a power transmitting unit.

The power transmitting coils 110a, 110b, 110c, 210 supply power to the power receiving coils 120a, 120b, 120c. Also, the power transmitting coils 110a, 110b, 110c, and 210 can simultaneously transmit power to the power receiving coils 120a, 120b, and 120c at a plurality of frequencies.

This controller Ctr1 is of a handy type. Controller Ctr1 has a grip. Therefore, when the user holds the controller Ctr1 and brings the controller Ctr1 closer to the light emitter EB1, the light emitter EB1 emits light. This is because the LED 450 emits light by wireless power supply.

3. Illumination System FIG. 12 is a conceptual diagram of an illumination system 1000 according to the fourth embodiment. The illumination system 1000 has a transparent container G1, a plurality of light emitters EB1, and a controller Ctr1. The transparent container G1 is a transparent container such as a glass. A plurality of light emitters EB1 are filled inside the transparent container G1. In FIG. 12, in order to facilitate understanding, the distance between the light emitters EB1 is widened.

4. State of Light Emission of Illumination System FIG. 13 is a diagram (part 1) showing light emission of the illumination system 1000 of the fourth embodiment. FIG. 14 is a diagram (part 2) showing the lighting of the illumination system 1000 of the fourth embodiment.

The controller Ctr1 changes the resonance frequency over time. That is, the control unit 360 of the controller Ctr1 controls on/off of the power transmission coils 110 a , 110 b , and 110 c and changes in the frequency fi of the power transmission coil 210 .

As a result, as shown in FIGS. 13 and 14, some of the various light emitters EB1 emit light and the rest of the various light emitters EB1 do not emit light at a certain time t1. The controller Ctr1 can also adjust the brightness of the light emitter EB1. Therefore, a brilliant illumination system 1000 is realized.

In wireless power feeding, the amount of power supplied generally varies depending on the distance between the power transmitting coil and the power receiving coil. For example, if controller Ctr1 is sufficiently far away from light emitter EB1, light emitter EB1 will not glow. Further, if the distance between the controller Ctr1 and the light emitter EB1 is maintained to a certain extent, the light emitter EB1 emits light with a certain brightness.

Therefore, by moving the handy-type controller Ctr1 closer to or away from the light emitter EB1, the user can change the light emitting state of the light emitter EB1. Also, the controller Ctr1 can select which light emitter EB1 to supply power to. Therefore, the aggregate of the light emitters EB1 emits a wide variety of light depending on the movement of the user's hand and the temporal change in the frequency of the controller Ctr1.

5. Effect of the Fourth Embodiment If the controller Ctr1 has a button for selecting which wavelength of light to emit light and a knob for adjusting brightness, the user can freely light the aggregate of the light emitters EB1. can be done. Also, if the controller Ctr1 has a program for changing the combination of frequencies over time, it is possible to light the aggregate of the light emitters EB1 according to the program.

6. Modification 6-1. Wavelength Conversion Element FIG. 15 is a diagram illustrating the structure of the light emitter EB2 in a modification of the fourth embodiment. The light emitter EB2 has a wavelength conversion element 480 in addition to the configuration of the light emitter EB1. Resin 470 contains wavelength conversion element 480 . The wavelength conversion elements 480 are preferably arranged sparsely with respect to the resin 470 . Also, the wavelength conversion element 480 may have a plurality of types of elements. This is because the light emitter EB2 emits a plurality of colors to the outside. Therefore, the light emitter EB2 exhibits different colors depending on the viewing angle or orientation.

6-2. Resonance Frequency FIG. 16 is a graph showing the relationship between the frequency and the light output in each light emitting unit of the illumination system 1000 in the modification of the fourth embodiment. As shown in FIG. 16, the resonance frequencies of the plurality of light emitters EB1 are close to each other. Therefore, the frequency band of the first light emitter EB1 and the frequency band of the second light emitter EB1 partially overlap. That is, part of the resonance frequency band of the first power receiving coil overlaps with part of the resonance frequency band of the second power receiving coil. For example, at frequency fj, the first light emitter EB1 emits a slightly stronger light, while the second light emitter EB1 emits a weaker light. Therefore, the illumination system 1000 lights up with more complex variations.

6-3. Shape of Light Emitting Body FIG. 17 is a diagram for explaining the structure of the light emitting body EB3 in the modification of the fourth embodiment. As shown in FIG. 17, the surface surrounded by the coil 420 constitutes the bottom surface 472 of the light emitter EB3. Thus, illuminant EB3 is not spherical. The outermost surface of light emitter EB3 has a flat surface and a spherical surface. In this way, it may be a luminous body that is not spherical.

FIG. 18 is a diagram for explaining the structure of the light emitter EB4 in the modified example of the fourth embodiment. As shown in FIG. 18, the shape of the light emitter EB4 may be cylindrical. Light emitter EB4 has a scattering member SC1.

6-4. Material of Light Emitting Body Instead of the resin 470, other transparent insulating materials may be used. Examples include glass. Of course, other transparent insulating materials may be used.

6-5. Combination The above modifications may be freely combined. Moreover, the modified example of the first embodiment and the modified example of the third embodiment can be applied to the fourth embodiment.

(Appendix)
An illumination device according to a first aspect includes a plurality of power receiving units including light emitting elements and power receiving coils that supply power to the light emitting elements, and a power transmitting unit including power transmitting coils that supply power to the power receiving coils. The power transmission side unit has a power transmission side capacitor connected in series with the power transmission coil. The plurality of power receiving units have power receiving capacitors connected in series with the power receiving coils. A transmitting unit can simultaneously transmit on one or more frequencies. The plurality of power-receiving-side units can receive power in resonance frequency bands in which the resonance frequencies, which are medians of the resonance frequency bands, do not match each other.

In the illumination device according to the second aspect, the power transmission side unit has a capacitor with a constant capacitance as the power transmission side capacitor.

In the illumination device according to the third aspect, the power transmission side unit has a variable capacitance capacitor as the power transmission side capacitor.

In the illumination device according to the fourth aspect, part of the resonance frequency band of the first power receiving coil overlaps part of the resonance frequency band of the second power receiving coil.

In the illumination device according to the fifth aspect, the power receiving unit is a light emitter in which a light emitting element is sealed with a transparent insulating material.

In the illumination device according to the sixth aspect, the transparent insulating material is glass or transparent resin.

In the illumination device according to the seventh aspect, the transparent insulating material includes the wavelength conversion element.

In the illumination device according to the eighth aspect, the power receiving unit has a sound generator. The power receiving coil supplies power to the sound generator.

The light emitter in the ninth aspect includes a light emitting element, a power receiving coil that supplies power to the light emitting element, a capacitor connected in series with the power receiving coil, and a transparent insulating material that seals the light emitting element.

In the light emitter according to the tenth aspect, the transparent insulating material covers the power receiving coil.

In the light emitter according to the eleventh aspect, the transparent insulating material includes the wavelength conversion element.

The controller in the twelfth aspect has a power transmission coil and a capacitor connected in series with the power transmission coil. The power transmission coil supplies power to the power reception coil that powers the light emitting element, and can simultaneously transmit power to the power reception coil at multiple frequencies.

Reference Signs List 100 Illumination devices 110a, 110b, 110c Power transmitting coils 120a, 120b, 120c Power receiving coils 130a, 130b, 130c Power transmitting circuits 140a, 140b, 140c Power receiving circuits 150a, 150b, 150c LED
160... Control unit

Claims (8)

a plurality of power-receiving-side units each including a light-emitting element and a power-receiving coil that supplies power to the light-emitting element;
a power transmission side unit including a plurality of first power transmission coils that supply power to each of the power reception coils of the plurality of power reception side units, and a second power transmission coil that supplies power to the plurality of power reception side units;
has
The power transmission side unit
a first power transmission side capacitor connected in series to each of the plurality of first power transmission coils and having an invariable capacitance ;
a second power transmission side capacitor connected in series with the second power transmission coil and having a continuously variable capacitance;
The plurality of power receiving units,
a power receiving capacitor connected in series to each of the plurality of power receiving coils;
Resonance frequencies of the plurality of first power transmission coils and the plurality of first power transmission side capacitors are different,
The plurality of first power transmission coils are capable of transmitting power simultaneously,
At least one of the plurality of first power transmission coils and the second power transmission coil are capable of transmitting power simultaneously,
The plurality of power receiving units,
An illumination device capable of receiving power in resonance frequency bands in which resonance frequencies, which are medians of resonance frequency bands, do not match each other. In the illumination device according to claim 1,
An illumination device including a portion of the resonant frequency band of the first power receiving coil overlapping a portion of the resonant frequency band of the second power receiving coil. In the illumination device according to claim 1 or claim 2 ,
The power receiving unit,
An illumination device, wherein the light-emitting element is a light-emitting body sealed with a transparent insulating material. In the illumination device according to claim 3 ,
The transparent insulating material is
Illumination device including being glass or transparent resin. In the illumination device according to claim 3 or claim 4 ,
The transparent insulating material is
An illumination device comprising including a wavelength converting element. In the illumination device according to claim 1 or claim 2 ,
The power receiving unit,
having a sound generator,
The receiving coil is
An illumination device comprising supplying power to the sound generator. In the illumination device according to any one of claims 1 to 6,
The power transmission side unit is configured such that the distance from the power reception side unit can be varied.
Illumination device including. In the illumination device according to claim 7,
The power transmission side unit is a handy type controller.
Illumination device including.

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