JP5834239B2 - Illumination light communication apparatus, lighting apparatus using the same, and illumination system - Google Patents

Description

  The present invention relates to an illumination light communication device that performs visible light communication by modulating the intensity of illumination light, a lighting fixture using the same, and an illumination system.

  In recent years, lighting fixtures equipped with a visible light communication function for transmitting various types of information to free space using illumination light have been proposed. The lighting fixture described in Patent Document 1 includes a light emitting unit substrate on which a light emitting diode that is a semiconductor light emitting element is disposed, a lighting circuit substrate that is connected to the light emitting unit substrate and controls lighting of the light emitting diode, and the light emitting diode is connected to visible light communication And a visible light communication control board to be controlled. Since the visible light communication control board is separately arranged so as to be connectable between the lighting circuit board and the light emitting unit board, in this conventional example, the design of the lighting equipment that is equipped with the visible light communication function and the lighting equipment that is not installed are common. Can be

JP 2011-34713 A

  By the way, visible light communication as in the above-described conventional example is performed by modulating the intensity of illumination light in accordance with an information signal (communication signal) to be transmitted. That is, in the illumination light communication device on the transmission side, the communication signal is superimposed on the illumination light by blinking the light source unit having the light emitting diode as a light source. Then, the receiver on the receiving side receives the communication signal by detecting the difference between the light intensity on which the pulse of the communication signal is not superimposed and the light intensity on which the pulse of the communication signal is superimposed.

  Here, in the case of amplitude control in which the light source unit is dimmed by changing the magnitude of the load current, since the load current flows continuously without interruption, the communication signal can also be superimposed continuously. It is. However, in the case of PWM control that performs dimming of the light source unit by alternately repeating the period in which the load current flows and the period in which the load current does not flow, the communication signal cannot be superimposed in the period in which the load current does not flow, and visible There was a risk that optical communication would be interrupted.

  The present invention has been made in view of the above points, and an illumination optical communication apparatus capable of performing visible light communication without interruption even when light control of a light source unit is performed by PWM control, and illumination using the same An object is to provide an appliance and a lighting system.

  The illumination light communication apparatus according to the present invention includes a main light source unit composed of a first light emitting element, and a first light source that performs PWM control on a load current flowing through the main light source unit based on a dimming signal to dimm the main light source unit. A power supply unit, an impedance element connected in series to the main light source unit, a first switch element connected in parallel with the impedance element, a binary communication signal is generated and the first signal is generated by the communication signal. And a communication unit that superimposes the communication signal by modulating the light intensity of the illumination light output from the main light source unit by controlling on / off of one switch element, and the impedance element includes the first The auxiliary light source unit has a second light emitting element different from the light emitting element, and the auxiliary light source unit is connected to a second power source unit that supplies lighting power to the auxiliary light source unit during the PWM control off period The communication Is characterized in that the communication signal is superimposed by modulating the light intensity of the light output from the auxiliary light source unit by controlling on / off of the first switch element during the off period of the PWM control. .

  In this illumination light communication apparatus, it is preferable that the auxiliary light source unit includes at least one second light emitting element, and the first switch element is connected in parallel to at least the second light emitting element. .

  In this illumination light communication apparatus, it is preferable that the second light emitting element is an infrared light emitting diode.

  In the illumination light communication apparatus, it is preferable that the second light emitting element is a visible light emitting diode.

  In this illumination light communication apparatus, the visible light emitting diode is preferably formed by combining a light emitting diode having a single emission color or a plurality of light emitting diodes having different single emission colors.

  In the illumination light communication apparatus, it is preferable that the first power supply unit and the second power supply unit are configured from different power sources.

  In this illumination light communication apparatus, a backflow prevention circuit for preventing a backflow of a load current flowing through the main light source to the second power supply unit is provided in a path connecting the auxiliary light source unit and the second power supply unit. And a short-circuit prevention circuit for preventing a short circuit of the second power supply unit.

  The illumination light communication apparatus includes a second switch element that opens and closes a path that connects the auxiliary light source unit and the second power supply unit, and the second switch element includes the first switch element. Preferably, the path is opened when switched on and the path is closed when the first switch element is switched off.

  In the illumination light communication apparatus, it is preferable that the communication unit includes an inverting circuit that inverts the communication signal and outputs the inverted signal to the first switch element during an OFF period of the PWM control.

  The lighting fixture of this invention is equipped with the fixture main body holding one of the said illumination light communication apparatuses, It is characterized by the above-mentioned.

  An illumination system according to the present invention includes any one of the illumination light communication devices described above and a receiver that receives the communication signal transmitted from the illumination light communication device.

  In the illumination system, the receiver includes a first receiving unit that receives the communication signal transmitted from the main light source unit, and a second receiving unit that receives the communication signal transmitted from the auxiliary light source unit. It is preferable to comprise.

  The present invention has an effect that visible light communication can be performed without interruption even when the light source unit is dimmed by PWM control.

It is the circuit schematic which shows Embodiment 1 of the illumination light communication apparatus which concerns on this invention. It is an operation | movement waveform diagram in an illumination light communication apparatus same as the above. (A)-(d) is a figure which shows the structure of the auxiliary light source part in an illumination light communication apparatus same as the above. It is a figure which shows the other structure of the 2nd power supply part in an illumination light communication apparatus same as the above. It is explanatory drawing of the quaternary pulse position modulation system in the illumination light communication apparatus same as the above. It is the circuit schematic which shows Embodiment 2 of the illumination light communication apparatus which concerns on this invention. (A)-(c) is a figure which shows embodiment of the lighting fixture which concerns on this invention. (A), (b) is a figure which shows the example of arrangement | positioning of the main light source part and auxiliary light source part in a lighting fixture same as the above. It is a figure which shows embodiment of the illumination system which concerns on this invention, (a) is schematic, (b) is schematic of a receiver, (c) is a circuit schematic of a receiver.

(Embodiment 1)
Hereinafter, Embodiment 1 of the illumination light communication apparatus according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the present embodiment includes an AC / DC converter 1 that receives a commercial power supply AC1. The AC / DC converter 1 rectifies the AC voltage from the commercial power source AC1 by a rectifier circuit (not shown), switches the output by a switching element Q0 made of, for example, a MOSFET, and smoothes it by a smoothing capacitor (not shown). By doing so, it is converted into a DC voltage.

  Between the output terminals of the AC / DC converter 1, a main light source unit 2 composed of a plurality of light emitting diodes (first light emitting elements) LD 1 and a current detection resistor 3 are connected in series. In the present embodiment, the light emitting diode LD1 of the main light source unit 2 has a light emission color of white and a color temperature of 5000K. Of course, the light emitting diode LD1 need not be limited to this, and other light emitting diodes may be used for lighting applications.

  One end of the current detection resistor 3 is connected to the inverting input terminal of the error amplifier A1. For this reason, the potential of one end of the current detection resistor 3 is input to the inverting input terminal of the error amplifier A1. The other end of the current detection resistor 3 is connected to the non-inverting input terminal of the error amplifier A1 through the reference voltage source E1. Therefore, the error amplifier A1 outputs a signal obtained by amplifying the difference between the voltage drop of the current detection resistor 3 and the power supply voltage of the reference voltage source E1 to the output control unit 5.

  The output control unit 5 controls on / off of the switching element Q0 based on the feedback signal input from the error amplifier A1. Thereby, the output control unit 5 performs control so that the first load current I0 flowing through the main light source unit 2 is kept constant. Further, the output control unit 5 performs PWM control on the first load current I0 by performing switching control of the AC / DC converter 1 based on a dimming signal given from an external device (not shown) such as a remote controller, for example. The main light source unit 2 is dimmed. That is, as shown in FIG. 2, the output control unit 5 does not flow the first load current I0 through the main light source unit 2 during the period during which the first load current I0 flows through the main light source unit 2 (ON period T1). The main light source unit 2 is dimmed by alternately repeating the period (off period T2). In this embodiment, the frequency of the dimming signal is 960 Hz.

  Note that a phase compensation circuit 4A including a resistor R1 and a capacitor C1, which are integral elements, is connected between the output terminal and the inverting input terminal of the error amplifier A1. The phase compensation circuit 4A adjusts the phase of the feedback signal while increasing the gain in the low frequency region and suppressing the gain in the high frequency region. The error amplifier A1 and the phase compensation circuit 4A constitute a constant current feedback circuit 4.

  That is, in the present embodiment, the above-described commercial power supply AC1, AC / DC converter 1, current detection resistor 3, constant current feedback circuit 4, and output control unit 5 PWM the first load current I0 flowing through the main light source unit 2. A first power supply unit that controls and dims the main light source unit 2 is configured.

  A parallel circuit of an impedance element 6 and a switching element Q1 (first switch element) is connected to the main light source unit 2 in series. The switching element Q1 is made of, for example, a MOSFET, and is turned on / off by a communication signal output from a communication signal generation circuit 7 described later.

  The impedance element 6 is configured by connecting in series an impedance element (not shown) such as a resistor and an auxiliary light source unit 60 having, for example, one or more light emitting diodes (second light emitting elements) LD2. . In the present embodiment, a visible light emitting diode having a light emitting color (for example, red, blue, green) different from the light emitting color of the light emitting diode LD1 is used as the light emitting diode LD2 of the auxiliary light source unit 60, for example. Of course, the light emitting diode LD2 is not limited to this, and may be a combination of visible light emitting diodes having different emission colors. For example, an infrared light emitting diode may be used as the light emitting diode LD2 if only visible light communication is used.

  For example, as shown in FIGS. 3A and 3B, the auxiliary light source unit 60 is configured by connecting impedance elements such as a resistor R0 and a diode D0 in series to the light emitting diode LD2. For example, as illustrated in FIG. 3C, the auxiliary light source unit 60 may be configured by connecting a plurality (two in the drawing) of light emitting diodes LD <b> 2 in series. In this embodiment, the switching element Q1 is connected to the impedance element 6 in parallel. However, as shown in FIG. 3D, the switching element Q1 is connected to the light emitting element LD2 of the auxiliary light source unit 60 in parallel. Also good.

  The communication signal generation circuit 7 modulates the light intensity of the main light source unit 2 to generate a binary communication signal that is superimposed on the illumination light and outputs it to the switching element Q1. In this embodiment, the frequency of the communication signal is 9.6 kHz. The communication signal generation circuit 7 may be configured to generate a binary communication signal based on a transmission signal input from an external device (not shown). In the present embodiment, the communication signal generation circuit 7 constitutes a communication unit.

  In the present embodiment, it is possible to switch whether or not the impedance element 6 is connected to the main light source unit 2 by controlling on / off of the switching element Q1 based on the communication signal. Thereby, the magnitude | size of the 1st load current I0 which flows through the main light source part 2, ie, the light intensity of the main light source part 2, can be changed.

  Specifically, as shown in FIG. 2, when the switching element Q1 is on, the first load current I0 flows through the main light source unit 2 without passing through the impedance element 6, so that the current value I1 is It becomes larger than the average value of the first load current I0. When the switching element Q1 is off, the first load current I0 flows through the main light source unit 2 via the impedance element 6, so that the current value I2 is larger than the average value of the first load current I0. Get smaller. Thus, by changing the magnitude of the first load current I0, the light intensity of the main light source unit 2 can be modulated, and the communication signal can be superimposed on the illumination light of the main light source unit 2.

  Here, in the present embodiment, a second power source unit that is a power source different from the first power source unit is connected in parallel with the impedance element 6 and the switching element Q1. The second power source unit supplies lighting power to the auxiliary light source unit 60. As shown in FIG. 1, the second power source unit is an AC that converts a commercial power source AC1 and an AC voltage from the commercial power source AC1 into a predetermined DC voltage. / DC converter 8.

  A diode D1, a resistor R2, and a switching element Q2 (second switch element) are connected in series on a path connecting between the auxiliary light source unit 60 and the AC / DC converter 8. The diode D <b> 1 is a backflow prevention circuit that prevents the first load current I <b> 1 flowing through the main light source unit 2 from flowing back to the AC / DC converter 8. The resistor R2 is a short circuit prevention circuit that prevents a short circuit of the AC / DC converter 8 by preventing a short circuit current from flowing from the AC / DC converter when the switching element Q2 is switched on. The resistor R2 limits the second load current flowing through the auxiliary light source unit 60 when the switching element Q2 is on.

  The switching element Q2 is controlled to be turned on / off based on a communication signal input from the communication signal generation circuit 7, and is turned on when the switching element Q1 is turned off, whereby the auxiliary light source unit 60 and the AC / DC converter 8 are switched on. Close the path that connects the two. Thereby, the lighting power is supplied from the second power supply unit to the auxiliary light source unit 60, and light can be output from the auxiliary light source unit 60.

  In addition, the switching element Q2 opens a path connecting between the auxiliary light source unit 60 and the AC / DC converter 8 by switching to OFF when the switching element Q1 is ON. Thereby, when the switching element Q1 is on, it is possible to prevent a current that does not contribute to lighting of the auxiliary light source unit 60 from flowing, and it is possible to prevent wasteful power consumption.

  For example, as shown in FIG. 4, the second power supply unit may include a secondary battery 80 and a charging circuit 81 that charges the secondary battery 80 by the output of the AC / DC converter 8. Good. The second power supply unit supplies the lighting power from the AC / DC converter 8 to the auxiliary light source unit 60 in a normal state, and supplies the lighting power from the secondary battery 80 to the auxiliary light source unit 60 at the time of a power failure of the commercial power supply AC1. A switching circuit 82 for switching the power feeding path is provided. Thus, by using the secondary battery 80 together to configure the second power supply unit, it is possible to supply lighting power to the auxiliary light source unit 60 even when the commercial power supply AC1 fails.

  In the present embodiment, the first power supply unit and the second power supply unit are configured with different power supplies. For example, the lighting power is supplied to the auxiliary light source unit 60 from the AC / DC converter 1 of the first power supply unit. You may comprise so that it may supply. That is, you may comprise so that a 1st power supply part and a 2nd power supply part may be shared.

  Hereinafter, the operation of visible light communication in the present embodiment will be described with reference to the drawings. As shown in FIG. 2, the first load current I0 flows through the main light source unit 2 in the PWM control on-period T1. Therefore, the first load current I0 is controlled by turning on / off the switching element Q1 based on the communication signal, and the communication signal is superimposed by modulating the light intensity of the illumination light of the main light source unit 2. Can be made.

  Further, the second load current also flows through the auxiliary light source 60 in the PWM control ON period T1. For this reason, the second load current is controlled by ON / OFF control of the switching element Q1 based on the communication signal, and the light intensity of the light from the auxiliary light source unit 60 is modulated, thereby illuminating the main light source unit 2 An inverted communication signal obtained by inverting a communication signal to be superimposed on light can be superimposed.

  On the other hand, in the off period T2 of the PWM control, the first load current I0 does not flow through the main light source unit 2, and thus the communication signal cannot be superimposed on the illumination light of the main light source 2. The second load current flows in response to power supply from the second power supply unit. Therefore, the second load current I2 is controlled by controlling the switching element Q1 on / off based on the communication signal, and the inverted communication signal is superimposed by modulating the light intensity of the light from the auxiliary light source unit 60. Can be made.

  In the present embodiment, the resistor R2 is adjusted so that the current value I3 of the second load current I2 during the PWM control OFF period T2 is substantially equal to the current value I2, but the current value I3 is not necessarily limited. There is no need to adjust the resistance R2 so that the current value I2 becomes substantially equal to the current value I2. This is because, in general, a receiver (not shown) that receives a communication signal performs a conversion process into a binary signal based on whether or not the light intensity of the received light exceeds a preset threshold value. For this reason, it is sufficient that each light intensity corresponding to the binary value of the communication signal changes with a threshold therebetween, and it is sufficient that the absolute value of the current value I3 exceeds the threshold.

  As described above, in the present embodiment, by modulating the light intensity of the light from the auxiliary light source unit 60, it is possible to superimpose the communication signal even during the PWM control off period T2 when the main light source unit 2 is turned off. . Therefore, in the present embodiment, visible light communication can be performed without interruption even when light control of the main light source unit 2 is performed by PWM control.

  In addition, when the light emitting diode LD2 of the auxiliary light source unit 60 is configured by an infrared light emitting diode, there are the following advantages. That is, for example, even when the main light source unit 2 is simply turned off or when the main light source unit 2 is unintentionally turned off due to a power failure or the like, a communication signal can be transmitted without irradiating visible light. Is possible.

  By the way, in this embodiment, visible light communication is performed by modulating the light intensity of the main light source unit 2 by the communication signal as described above. As a modulation method, for example, quaternary pulse position modulation (4PPM) is used. A method may be adopted. As shown in FIG. 5, quaternary pulse position modulation first divides a fixed time defined as a symbol time into four slots, and a pulse is input to any one of these slots. It transmits 2-bit data.

  For example, as shown in FIG. 5, if the communication signal (4PPM signal) in one symbol time is “1000”, “00” data can be transmitted, and if the communication signal is “0100”, “01”. Data can be transmitted. Similarly, if the communication signal in one symbol time is “0010”, data “10” can be transmitted, and if the communication signal is “0001”, data “11” can be transmitted.

(Embodiment 2)
Hereinafter, Embodiment 2 of the illumination light communication apparatus according to the present invention will be described with reference to the drawings. However, since the basic configuration of the present embodiment is common to that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 6, the present embodiment is characterized in that an inverting circuit 9 is provided between the switching element Q1 and the communication signal generation circuit 7.

  The inverter circuit 9 operates based on a dimming signal given from the outside, inverts the communication signal input from the communication signal generation circuit 7 in the PWM control off period T2, and outputs the inverted signal to the switching element Q1. Here, in Embodiment 1, as described above, the communication signal superimposed on the light of the auxiliary light source unit 2 is an inverted communication signal obtained by inverting the communication signal superimposed on the illumination light of the main light source unit 2. . For this reason, it is necessary to configure the receiver so that the communication signals transmitted from the respective light source units 2 and 60 can be individually received, and two receiving units must be provided.

  On the other hand, in this embodiment, during the PWM control off period, the inversion signal output from the communication signal generation circuit 7 is inverted by the inversion circuit 9 and output to the switching element Q1. For this reason, since the switching element Q1 is on / off controlled by the inverted communication signal, the inverted signal superimposed on the light of the auxiliary light source unit 2 is an inverted version of the inverted communication signal, that is, the illumination of the main light source unit 2 It has the same phase as the communication signal superimposed on the light.

  As described above, in the present embodiment, by using the inverting circuit 9, the phase of the communication signal superimposed on the light of the auxiliary light source unit 60 in the off period T <b> 2 during PWM control is changed to the illumination light of the main light source unit 2. It is converted into the same phase as the communication signal lamp to be superimposed. Therefore, it is not necessary to configure the receiver so that communication signals transmitted from the light source units 2 and 60 can be individually received.

Hereinafter, embodiments of a lighting fixture and a lighting system according to the present invention will be described with reference to the drawings. In the following description, the vertical direction in FIG. 7B is defined as the vertical direction. First, an embodiment of a lighting fixture according to the present invention will be described. The lighting fixture 10 of this embodiment is
For example, as illustrated in FIGS. 7A to 7C, the downlight includes a bowl-shaped instrument body 10 </ b> A having an open bottom surface. Then, any one of the illumination light communication devices (not shown) is held inside the instrument body 10A. The main light source unit 2 and the auxiliary light source unit 60 included in the illumination light communication device are disposed so as to face an external space through an opening on the lower surface of the instrument body 10A, and irradiate light toward the external space. .

  Here, for example, as shown in FIG. 8A, a first reflecting plate 10B that reflects illumination light from the main light source unit 2, and a second reflecting plate 10C that reflects light from the auxiliary light source unit 60, May be provided inside the instrument body 10A. In this case, the irradiation direction of the light from each light source part 2 and 60 can be adjusted with each reflecting plate 10B and 10C. Further, for example, as shown in FIG. 8B, a flange portion 10D that protrudes outward from the opening on the lower surface of the instrument body 10A is provided, and the light emitting element LD2 of the auxiliary light source 60 is provided on the flange portion 10D. It may be provided. In this case, the main light source unit 2 and the auxiliary light source unit 60 can be arranged separately.

  In addition, the lighting fixture 10 does not need to be limited to the above downlights, The lighting fixture which consists of another structure may be sufficient.

  In the present embodiment, since the illumination light communication device of any one of the above embodiments is used, visible light communication can be performed without interruption even when the main light source unit 2 is dimmed by PWM control.

  Next, an embodiment of an illumination system according to the present invention will be described. In this embodiment, as shown in FIG. 9A, the illumination light communication device (not shown) of any of the above embodiments, and a receiver 11 that receives a communication signal transmitted from the illumination light communication device, Consists of In the present embodiment, the illumination light communication device is held inside the luminaire 10 embedded in the ceiling.

  For example, the receiver 11 includes a mobile terminal as illustrated in FIG. 9B, and includes a light receiving unit 11 </ b> A including a photodiode that receives illumination light emitted from the lighting fixture 10. The receiver 11 includes, for example, a display unit 11B composed of a liquid crystal display, an operation unit (not shown), and a signal processing circuit 11C that reads a communication signal based on the light intensity of illumination light received by the light receiving unit 11A. (See FIG. 9C). The operation unit may be realized by configuring the display unit 11B with a touch panel. The receiver 11 is not necessarily limited to the portable terminal described above, and may be a receiver having another configuration.

  Therefore, as shown in FIG. 9A, the user can receive the communication signal superimposed on the illumination light from the lighting fixture 10 within the illumination range of the lighting fixture 10 by holding the receiver 11. . Thereby, the receiver 11 detects the position information included in the communication signal, for example, and displays the image on the display unit 11B or outputs the sound with the built-in speaker to notify the user of the current position. Can do. Of course, the application of the present embodiment need not be limited to the application for notifying the user of the current position, and may be other applications.

  In the present embodiment, since the illumination light communication device of any one of the above embodiments is used, visible light communication can be performed without interruption even when the main light source unit 2 is dimmed by PWM control.

  As described above, when the communication signal transmitted from the main light source unit 2 and the communication signal (inverted communication signal) transmitted from the auxiliary light source unit 60 are inverted from each other, each communication signal is individually transmitted. Two light receiving portions 11A should be provided so that they can be received. These light receiving units 11A correspond to a “first receiving unit” and a “second receiving unit”. Thus, by providing two light receiving units 11A and individually receiving communication signals from the light source units 2 and 60, the communication processing circuit 11C can process each communication signal individually.

  Further, when the light emission color of the light emitting diode LD2 of the auxiliary light source unit 60 is different from the light emission color (white) of the light emitting diode LD1 of the main light source unit 2 (for example, red, green, blue), Thus, the two light receiving portions 11A should be provided. In this case, each communication signal can be received individually by providing a red filter or a blue filter according to the emission color of the light received by one of the light receiving portions 11A. Furthermore, even when the light emitting diode LD2 of the auxiliary light source unit 60 is an infrared light emitting diode, the two light receiving units 11A should be provided as described above. In this case, one light receiving unit 11A is configured by an infrared light receiver.

1 AC / DC converter (first power supply)
2 Main light source section 3 Current detection resistor (first power supply section)
4 Constant current feedback circuit (first power supply)
5 Output control unit (first power supply unit)
6 Impedance element 60 Auxiliary light source unit 7 Communication signal generation circuit (communication unit)
8 AC / DC converter (second power supply)
AC1 commercial power supply (first power supply, second power supply)
LD1 light emitting diode (first light emitting element)
LD2 Light emitting diode (second light emitting element)
Q1 switching element (first switch element)
Q2 switching element (second switch element)

Claims (12)

  A main light source unit comprising a first light emitting element, a first power source unit for dimming the main light source unit by PWM controlling a load current flowing through the main light source unit based on a dimming signal, and the main light source unit An impedance element connected in series, a first switch element connected in parallel with the impedance element, and generating a binary communication signal and turning on / off the first switch element by the communication signal And a communication unit that modulates light intensity of illumination light output from the main light source unit to superimpose the communication signal, and the impedance element is a second light emission different from the first light emitting element. A second power supply unit that supplies lighting power to the auxiliary light source unit in the off period of the PWM control is connected to the auxiliary light source unit; Control off Illumination optical communication device characterized by superposing the communication signal by modulating the light intensity of the light output of the auxiliary light source unit by controlling the on / off of the first switching element between.   The auxiliary light source unit includes at least one second light emitting element, and the first switch element is connected in parallel to at least the second light emitting element. Illumination light communication device.   The illumination light communication apparatus according to claim 1, wherein the second light emitting element is an infrared light emitting diode.   The illumination light communication apparatus according to claim 1, wherein the second light emitting element is a visible light emitting diode.   5. The illumination light communication device according to claim 4, wherein the visible light emitting diode is formed by combining a light emitting diode having a single emission color or a plurality of light emitting diodes having different emission colors.   The illumination light communication apparatus according to any one of claims 1 to 5, wherein the first power supply unit and the second power supply unit are configured from different power supplies.   In a path connecting the auxiliary light source unit and the second power source unit, a backflow prevention circuit for preventing a backflow of a load current flowing through the main light source to the second power source unit, and the second power source The illumination light communication apparatus according to claim 6, wherein a short-circuit prevention circuit for preventing a short circuit of the unit is connected.   A second switch element that opens and closes a path connecting the auxiliary light source unit and the second power supply unit, and the second switch element switches the path when the first switch element is turned on; 8. The illumination light communication apparatus according to claim 6, wherein the path is closed when the first switch element is opened and the first switch element is turned off.   The illumination light communication apparatus according to claim 8, wherein the communication unit includes an inverting circuit that inverts the communication signal and outputs the inverted signal to the first switch element during an OFF period of the PWM control.   A lighting fixture comprising: a fixture body that holds the illumination optical communication device according to any one of claims 1 to 9.   An illumination system comprising: the illumination light communication device according to any one of claims 1 to 9; and a receiver that receives the communication signal transmitted from the illumination light communication device.   The receiver includes a first receiving unit that receives the communication signal transmitted from the main light source unit, and a second receiving unit that receives the communication signal transmitted from the auxiliary light source unit. 12. A lighting system according to claim 11, wherein

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