Abstract: A lighting fixture for visible light communication is configured to modulate light intensity of a light source (11) comprising a light-emitting device (2) to superpose a communication signal on illumination light. The lighting fixture includes: a power supply circuit (3) configured to control light output of the light source (11) based on a dimming signal; a switch device (Q1) for modulating an output current from the power supply circuit (3) to the light source (11); an impedance element (Rx); a communication circuit (4); and an ON circuit (6). The communication circuit (4) is configured to supply a modulation signal to a side of the switch device (Q1) to superpose the communication signal on the illumination light. The ON circuit (6) is configured to turn on the switch device (Q1) by supply power from the power supply circuit (3) when the communication circuit (4) is inactivated.

Abstract: A visible light communication apparatus includes a constant current circuit and a load circuit including light emitting elements connected to output terminals of the constant current circuit. Further, the visible light communication apparatus includes a load variation circuit configured to change load characteristics of the load circuit by electrically connecting to the load circuit, the load variation circuit including a series circuit of a diode and a resistor connected in series to the load circuit and a switching element configured to electrically connect or disconnect the load variation circuit to the load circuit in response to a binary communication signal.

Abstract: An illuminating light communication device comprises a constant current source, a smoothing capacitor connected to an output of the constant current source, a load circuit comprising a light emitting diode and connected to the output of the constant current source, a load change element added to the load circuit and thereby partially changing load characteristic of the load circuit, and a switch element configured to determine whether or not the load change element is added to the load circuit in accordance with a binary optical communication signal.

Abstract: The visible light communication device includes a control circuit configured to repeat a transmission process of transmitting a communication signal through modulating an intensity of visible light to be emitted from a light source. The control circuit is configured to, in the transmission process, arbitrarily select a time slot for transmission from a plurality of time slots set within a predetermined time period allocated to the transmission process, and transmit the communication signal in the time slot for transmission.

Abstract: A lighting fixture is configured to modulate light intensity of a light source (11) comprising a light-emitting device (2) to superpose a communication signal on illumination light of the light source (11). The fixture includes: a main power supply (3) configured to control light output of the light source (11) based on a dimming signal; a switch device (Q1) for modulating an output current supplied from the main power supply (3) to the light source (11); an impedance element (Rx); a communication circuit (7); and a control power supply (8). The communication circuit (7) is configured to control the switch device (Q1) to superpose a modulation signal on illumination light from the light source (11). The control power supply (8) is configured to supply electric power to the communication circuit (7). One end of two input ends of the control power supply (8) is connected to one end of the impedance element.

Abstract: A server is configured to manage second positional information, which shows a location of the lighting device, so that the second positional information is associated with the ID information of the lighting device. The server is configured to determine whether or not the ID information received from the receiving terminal is justifiable based on the second positional information, which corresponds to the ID information received from the receiving terminal, and the first positional information, which is received from the receiving terminal. The server is configured to reply, to the receiving terminal, the service information corresponding to the ID information received from the receiving terminal when determining that the ID information received from the receiving terminal is justifiable. The server is configured not to reply the service information to the receiving terminal when determining that the ID information received from the receiving terminal is not justifiable.

Abstract: A lighting apparatus for visible light communication includes at least one luminaire body and a visible-light-communication-signal-outputting part. The luminaire body includes a light source that includes an LED. The visible-light-communication-signal-outputting part is configured to output a modulation signal to the luminaire body. The luminaire body further includes: a power supply circuit configured to dim the light source; a switch element for modulating an output current that is supplied from the power supply circuit to the light source; a resistor connected in parallel with the switch element; and a photo-coupler configured to receive the modulation signal output from the visible-light-communication-signal-outputting part. The visible-light-communication-signal-outputting part is provided outside the luminaire body, and is configured to transmit the modulation signal via the photo-coupler.

Abstract: A communication module of a communication terminal is configured not to output to a control module, service information provided from a second server whose server ID is not registered in a first server. The communication module is configured to receive an authentication code from the first server, and to transmit ID information and terminal identification information to the second server. When the terminal identification information received from the communication module matches the terminal identification information received from the first server, the second server is configured to reply the authentication code and the service information to the communication module. When the authentication code received from the first server matches the authentication code received from the second server, the communication module is configured to output the service information to the control module.

Abstract: A visible light communication apparatus includes a constant current circuit and a load circuit including light emitting elements connected to output terminals of the constant current circuit. Further, the visible light communication apparatus includes a load variation circuit configured to change load characteristics of the load circuit by electrically connecting to the load circuit, the load variation circuit including a series circuit of a diode and a resistor connected in series to the load circuit and a switching element configured to electrically connect or disconnect the load variation circuit to the load circuit in response to a binary communication signal.

Abstract: The visible light communication device includes a control circuit configured to repeat a transmission process of transmitting a communication signal through modulating an intensity of visible light to be emitted from a light source. The control circuit is configured to, in the transmission process, arbitrarily select a time slot for transmission from a plurality of time slots set within a predetermined time period allocated to the transmission process, and transmit the communication signal in the time slot for transmission.

Abstract: A server is configured to manage second positional information, which shows a location of the lighting device, so that the second positional information is associated with the ID information of the lighting device. The server is configured to determine whether or not the ID information received from the receiving terminal is justifiable based on the second positional information, which corresponds to the ID information received from the receiving terminal, and the first positional information, which is received from the receiving terminal. The server is configured to reply, to the receiving terminal, the service information corresponding to the ID information received from the receiving terminal when determining that the ID information received from the receiving terminal is justifiable. The server is configured not to reply the service information to the receiving terminal when determining that the ID information received from the receiving terminal is not justifiable.

Abstract: The visible light communication system includes: a lighting fixture to send unique identification information by visible light communication; a receiver having a correction mode; and a server. In the correction mode, the receiver sends the identification information received from the lighting fixture, and in response to reception of positional information from the server, displays map information and the positional information on a display device, and waits for touch input to a touch panel. When receiving the touch input, the receiver sends corrected positional information determined by a position at which the touch input is received. When receiving the corrected positional information, the server replaces the positional information corresponding to the identification information with the corrected positional information.

Abstract: A lighting fixture for visible light communication is configured to modulate light intensity of a light source (11) comprising a light-emitting device (2) to superpose a communication signal on illumination light. The lighting fixture includes: a power supply circuit (3) configured to control light output of the light source (11) based on a dimming signal; a switch device (Q1) for modulating an output current from the power supply circuit (3) to the light source (11); an impedance element (Rx); a communication circuit (4); and an ON circuit (6). The communication circuit (4) is configured to supply a modulation signal to a side of the switch device (Q1) to superpose the communication signal on the illumination light. The ON circuit (6) is configured to turn on the switch device (Q1) by supply power from the power supply circuit (3) when the communication circuit (4) is inactivated.

Abstract: A lighting apparatus for visible light communication includes at least one luminaire body and a visible-light-communication-signal-outputting part. The luminaire body includes a light source that includes an LED. The visible-light-communication-signal-outputting part is configured to output a modulation signal to the luminaire body. The luminaire body further includes: a power supply circuit configured to dim the light source; a switch element for modulating an output current that is supplied from the power supply circuit to the light source; a resistor connected in parallel with the switch element; and a photo-coupler configured to receive the modulation signal output from the visible-light-communication-signal-outputting part. The visible-light-communication-signal-outputting part is provided outside the luminaire body, and is configured to transmit the modulation signal via the photo-coupler.

Abstract: A lighting fixture is configured to modulate light intensity of a light source (11) comprising a light-emitting device (2) to superpose a communication signal on illumination light of the light source (11). The fixture includes: a main power supply (3) configured to control light output of the light source (11) based on a dimming signal; a switch device (Q1) for modulating an output current supplied from the main power supply (3) to the light source (11); an impedance element (Rx); a communication circuit (7); and a control power supply (8). The communication circuit (7) is configured to control the switch device (Q1) to superpose a modulation signal on illumination light from the light source (11). The control power supply (8) is configured to supply electric power to the communication circuit (7). One end of two input ends of the control power supply (8) is connected to one end of the impedance element.

Abstract: A communication module of a communication terminal is configured not to output to a control module, service information provided from a second server whose server ID is not registered in a first server. The communication module is configured to receive an authentication code from the first server, and to transmit ID information and terminal identification information to the second server. When the terminal identification information received from the communication module matches the terminal identification information received from the first server, the second server is configured to reply the authentication code and the service information to the communication module. When the authentication code received from the first server matches the authentication code received from the second server, the communication module is configured to output the service information to the control module.

Abstract: An illumination light communication device includes a power supply unit controlling a load current in a light source unit to be maintained constant based on a dimming signal; an impedance unit series connected to the light source unit; a switch element parallel connected to the impedance unit to connect/disconnect the impedance unit with the light source unit; and a control unit controlling on/off of the switch element to modulate a light intensity of the light source unit such that a binary communication signal is superimposed on illumination light therefrom. The control unit controls the impedance of the impedance unit such that a difference between magnitudes of the load currents respectively when the pulse of the communication signal is superimposed and is not superimposed is maintained constant regardless of a dimming rate of the dimming signal in a range of a dimming rate equal to or greater than a predetermined level.

Abstract: An illumination light communication device includes a light source unit including light emitting elements; a power supply unit controlling a load current flowing through the light source unit to be maintained at a constant; a switch element connected in series to the light source unit; and a control unit configured to control on/off of the switch element to modulate a light intensity of illumination light from the light source unit such that a binary communication signal is superimposed on the illumination light. The control unit has a switching circuit to open/close a path between the light source unit and the power supply unit, controls on/off of the switching circuit based on a dimming signal to perform a dimming control on the light source unit by a PWM control, and allows the communication signal to be superimposed on the illumination light in synchronization with an ON time of the switching circuit.

Abstract: An illumination light communication device includes a light source unit including light emitting elements; a power supply unit controlling a load current flowing through the light source unit to be maintained at a constant; a switch element connected in series to the light source unit; and a control unit configured to control on/off of the switch element to modulate a light intensity of illumination light from the light source unit such that a binary communication signal is superimposed on the illumination light. The control unit has a switching circuit to open/close a path between the light source unit and the power supply unit, controls on/off of the switching circuit based on a dimming signal to perform a dimming control on the light source unit by a PWM control, and allows the communication signal to be superimposed on the illumination light in synchronization with an ON time of the switching circuit.

Abstract: An illumination light communication device includes a power supply unit controlling a load current in a light source unit to be maintained constant based on a dimming signal; an impedance unit series connected to the light source unit; a switch element parallel connected to the impedance unit to connect/disconnect the impedance unit with the light source unit; and a control unit controlling on/off of the switch element to modulate a light intensity of the light source unit such that a binary communication signal is superimposed on illumination light therefrom. The control unit controls the impedance of the impedance unit such that a difference between magnitudes of the load currents respectively when the pulse of the communication signal is superimposed and is not superimposed is maintained constant regardless of a dimming rate of the dimming signal in a range of a dimming rate equal to or greater than a predetermined level.