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: A Lighting device, which performs visible light communication with a receiver including an image sensor, includes: a dividing unit that divides identification information assigned to the lighting device into N packets (where N is a natural number greater than or equal to 2); a block generator that generates signal blocks each of which includes M packets (where M is a natural number greater than or equal to N) that include at least one of each of the N packets; and a light source that sequentially transmits the signal blocks in (i) each frame cycle of the image sensor or in (ii) each cycle substantially equal to an integral multiple of the frame cycle, by superimposing each of the signal blocks onto illumination light. The block generator generates the signal blocks so that an order of arranging the M packets is different between consecutive signal blocks in the signal blocks.

Abstract: A lighting device includes: a first light source which emits light that includes a visible light communication signal indicating first information; and a second light source which is disposed at a position different from a position of the first light source, and emits light that includes a visible light communication signal indicating second information different from the first information.

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 worker management device that manages a worker wearing workwear includes: a main body; a light receiver that is provided on a part of the main body that is exposed when the main body is attached to the workwear, and receives light including predetermined identification information; a controller connected to the light receiver; and a communication unit connected to the controller.

Abstract: A controller is configured, by decreasing light quantity in only a first slot that is any one of a plurality of slots into which a unit time is divided equally, and increasing light quantity in all the remaining slots except the first slot of the plurality of slots, to assign information to the first slot of the plurality of slots. The controller is furthermore configured to decrease light quantity in second slots that are three or more continuous slots starting from a head of a preamble, which indicates a frame start point, of a frame of an optical-communication signal and to increase light quantity in a slot immediately before the preamble.

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 luminaire includes an electric light source, a light source driver configured to turn on the light source, and a controller configured to control the light source driver. The controller is configured to control the light source driver to transmit, with a probability lower than 50% at a prescribed time interval, an optical signal with light of the light source as a medium while the light source is in ON. The prescribed time interval is longer than a time period during which the optical signal is transmitted.

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 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 LED dimming includes: current adjusting means (constant current circuit) for variably controlling a magnitude of a current flowing through an LED load; switching means (transistor) for intermittently controlling the current flowing through the LED load; and dimming controlling means (microcomputer) for controlling the current adjusting means and the switching means upon receiving a dimming signal outputted from a dimmer. In a case where the dimming signal outputted from the dimmer is on a higher brightness side than a predetermined level, the dimming controlling means flows a continuous current though the LED load, and dims the LED load based on a magnitude of the flowing current, and in a case where the dimming signal outputted from the dimmer is on a lower brightness side than the predetermined level, the dimming controlling means flows a pulse current through the LED load, and changes a mean value of waveforms of the pulse current, thereby dims the LED load.

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: An LED assembly has an AC voltage applied from a fluorescent lamp fixture via one or more power supply connectors belonging to a base which can be attached to the fluorescent lamp fixture, and the LED assembly includes a resistive circuit having impedance equivalent to that of a filament of a fluorescent lamp which can be attached to the fluorescent lamp fixture, a rectifier circuit for rectifying an AC voltage supplied via the resistive circuit, and a load circuit to be operated in response to a supply of a voltage rectified by the rectifier circuit.

Abstract: An LED dimming includes: current adjusting means (constant current circuit) for variably controlling a magnitude of a current flowing through an LED load; switching means (transistor) for intermittently controlling the current flowing through the LED load; and dimming controlling means (microcomputer) for controlling the current adjusting means and the switching means upon receiving a dimming signal outputted from a dimmer. In a case where the dimming signal outputted from the dimmer is on a higher brightness side than a predetermined level, the dimming controlling means flows a continuous current though the LED load, and dims the LED load based on a magnitude of the flowing current, and in a case where the dimming signal outputted from the dimmer is on a lower brightness side than the predetermined level, the dimming controlling means flows a pulse current through the LED load, and changes a mean value of waveforms of the pulse current, thereby dims the LED load.

Abstract: An electronic track lighting system comprises a power supply filter circuit having an input connected to an alternating current power supply AC, a rectifier circuit connected to an output of the power supply filter circuit, an inverter circuit connected to an output of the rectifier circuit and outputting a high frequency voltage by on/off operation of switching elements therein, a lamp load, and a power track providing supply voltage to the lamp load. The lighting system further comprises a first unit which is interposed between the AC power supply and an input of the power track and includes at least the power supply filter circuit, and a second unit which is provided as a structure independent from the first unit, is connected to the power track and outputs a high frequency voltage to the lamp load.