Abstract: An optical communication system includes a first communication system to communicate first information from a controller to a truck and a second communication system to communicate second information. The first communication system includes a first light emitter to output the first information, a first optical fiber to transport the light output from the first light emitter while letting the light leak therefrom, and a first light receiver to receive the light leaking from the first optical fiber. The second communication system includes a second light emitter to output second information, a second optical fiber to transport the light output from the second light emitter and input to the second optical fiber at some point along the second optical fiber, and a second light receiver to receive the light transported over the second optical fiber.

Abstract: An optical communication system includes a first communication system to communicate first information from a controller to a truck and a second communication system to communicate second information. The first communication system includes; a first light emitter to output the first information, a first optical fiber to transport the light output from the first light emitter while letting the light leak therefrom, and a first light receiver to receive the light leaking from the first optical fiber. The second communication system includes a second light emitter to output second information, a second optical fiber to transport the light output from the second light emitter and input to the second optical fiber at some point along the second optical fiber, and a second light receiver to receive the light transported over the second optical fiber.

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: 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: An illuminating light communication device, which is for establishing a communication system capable of controlling fluctuation in intensity of illuminating light when transmitting data using a power line and illuminating light, and satisfactorily carrying out communication using the power line and communication using the illuminating light, is provided. When data is transmitted through the power line, a signal component is extracted by a filter unit 12, and the demodulated by a power line modulator-demodulator 13, thereby retrieving the data. The retrieved data is temporarily stored in a protocol converter 14. Afterward, the data is converted to the optical communication protocol, and blinking or amount of light of a semiconductor light emitting element 16 is controlled according to the data transmitted from a light source control unit 15, thereby modulating the illuminating light. This allows transmission of data utilizing the illuminating light.

Abstract: An light source control unit controls the flashing of a light source and the light amount of a light source according to information to be transmitted. Thus, light, which is modulated according to the information to be transmitted, is emitted from the light source. The light emitted from the light source is made to enter an optical fiber to pass therethrough and enter a light-scattering body which scatters and radiates the modulated light incident from the optical fiber. The scattered light serves as illumination light as it is. Furthermore, if the illumination light is decoded by a decoding unit after being received by a photoreceptor unit of a receiving set, then information carried by the illumination light can be received.

Abstract: Information received from a wired network terminal on the wall face, or the like, is delivered as a light signal from a light transmitting/receiving section of a light communication unit. A lighting fixture is provided with a light transmitting/receiving section where light is received from the light communication unit in order to acquire information, and a light emitting element emits illumination light modulated according to that information. A terminal can acquire the information by receiving the illumination light at a light transmitting/receiving section. Since communication is performed from the light communication unit to the terminal by irradiating light into the space, a convenient illumination light communication system requiring no communication cable or laying work of optical fibers can be constructed.

Abstract: The illuminating end communication device is equipped with an illuminating light source. An electric power fed to the light source is modulated with a modulating unit responding to transmission data, and the modulated light is sent out as illuminating light. The illumination light is received by the light receiving unit of a terminal end communication device to maintain a downlink. Light emitted from the light emitting unit of the terminal end communication device is received by the light receiving unit of the illuminating end communication device to keep an uplink. Or, illuminating light is modulated on the basis of data when it is reflected, whereby data can be transmitted to the illuminating end communication device. It is preferable that illuminating light is reflected by CCR. A high-quality communication is realized using illuminating light of high power.

Abstract: In the case of performing communication by using illumination light when the illumination is on, switches are turned on, a signal modulated in an optical modulation part in accordance with information is superposed to a power waveform for the illumination with a power distributor and the illumination 16 is driven in a modulated state. When the illumination is off, the switches are turned off, a switch is turned on and a communication part is driven in a modulated state by the optical modulation part. The communication part can be constituted so as to include an infrared light emitting element part to perform infrared communication when the illumination is off. Consequently communication can be performed not only when the of illumination is on but also when the lighting is kept off. The communication device can be constituted of one element integrating the illumination part and the communication part, so that a compact system can be constituted.

Abstract: The present invention has been developed considering the above-described problems and aims to provide various structures and applications for illuminative light communication. According to the first aspect of the prevent invention, a broadcast system includes an LED light source 115 for lighting, a power line 103 that supplies electric power to the LED light source 115, a data modulator 102 that modulates and multiplexes a plurality of pieces of data, superimposes the resulting signal on an electric power waveform, and then transmits the resulting superimposed signal waveform to the power line 103, and a filter 112 that selectively separates one or more of a plurality of pieces of modulated data on the power line so as to control light intensity or blinking of the LED light source. Data is transmitted through changes in light intensity or blinking of the LED light source.

Abstract: A data communication system capable of controlling the brightness of light sensed by the human eye and quality communication using an illuminative light is provided. A PWM circuit 11 adjusts pulse width in conformity with a light intensity control signal corresponding to a desired light intensity, resulting in a PWM signal. The PWM signal is then transmitted to a phase inverter 12. The phase inverter 12 outputs the PWM signal as is when a data signal to be transmitted is 0, for example, while it inverts the phase of the PWM signal and then outputs the resulting inverted PWM signal when the data signal is 1. A light source driver circuit 13 drives, a light source 14 such as an LED, organic electroluminescence, or the like in conformity with the phase inverted signal to emit light. In a data reception unit 2, an optical sensor 21 converts light emitted from an illuminating device 1 to an electric signal. A phase detection circuit 22 detects the phase of the signal and then outputs a received data signal.

Abstract: A communications system implementing high-speed, high-quality communication in an oblong communication range such as mobile communication, and a leaky optical fiber preferably used in such communications system are provided. An optical fiber (2) is a GI-type optical fiber having a core structured such that the refractive index at the center is large, gradually decreasing as it approaches the periphery, and may have scatterers mixed therein. When modulated light enters the optical fiber (2) from a transmitter (1), the modulated light proceeds through the optical fiber (2) while a part of the light leaks from the side thereof. A receiver (3) receives this leaked light, and demodulates it so as to obtain data. Since the optical fiber (2) is a GI type, high-speed, high-quality mobile communication is possible with little waveform deformation.

Abstract: The present invention provides a camera-equipped cellular terminal capable of receiving visible light communication. In order to receive information from visible light, a light receiving unit (24) for visible light pointing to the same direction as a light receiving lens of the camera (21) is provided other than a camera (21) of a conventional camera-equipped cellular terminal (20). This light receiving unit (24) receives information from the visible light. This light receiving unit (24) may be configured by a photodiode or the like. When the camera (21) is used as a finder to display an illuminating device conducting visible light communication in a display of the camera, whether the light receiving unit 24 can receive information through visible light communication is determined.

Abstract: A receiving apparatus and transmitting apparatus capable of transmitting and receiving a high speed optical signal and a communication system using the same, including a transmitting apparatus having a conversion circuit for converting serially input data to a plurality of bits of parallel data given predetermined information and an LED array having a number of LED units corresponding to the number of bits of the parallel data from the conversion circuit arranged in an array, wherein the LED units are controlled in light emission in parallel based on bit information of corresponding parallel data to emit optical information signals dispersed in a spatially predetermined range, and of a receiving apparatus having a plurality of photo-diodes arranged in an array for emitting electric signals of levels in accordance with amounts of light received, wherein the photo-diodes output electric signals in parallel.

Abstract: A receiving apparatus and transmitting apparatus capable of transmitting and receiving a high speed optical signal and a communication system using the same, including a transmitting apparatus having a conversion circuit for converting serially input data to a plurality of bits of parallel data given predetermined information and an LED array having a number of LED units corresponding to the number of bits of the parallel data from the conversion circuit arranged in an array, wherein the LED units are controlled in light emission in parallel based on bit information of corresponding parallel data to emit optical information signals dispersed in a spatially predetermined range, and of a receiving apparatus having a plurality of photo-diodes arranged in an array for emitting electric signals of levels in accordance with amounts of light received, wherein the photo-diodes output electric signals in parallel.

Abstract: A receiving apparatus and transmitting apparatus capable of transmitting and receiving a high speed optical signal and a communication system using the same, including a transmitting apparatus having a conversion circuit for converting serially input data to a plurality of bits of parallel data given predetermined information and an LED array having a number of LED units corresponding to the number of bits of the parallel data from the conversion circuit arranged in an array, wherein the LED units are controlled in light emission in parallel based on bit information of corresponding parallel data to emit optical information signals dispersed in a spatially predetermined range, and of a receiving apparatus having a plurality of photo-diodes arranged in an array for emitting electric signals of levels in accordance with amounts of light received, wherein the photo-diodes output electric signals in parallel.

Abstract: A receiving apparatus and transmitting apparatus capable of transmitting and receiving a high speed optical signal and a communication system using the same, including a transmitting apparatus having a conversion circuit for converting serially input data to a plurality of bits of parallel data given predetermined information and an LED array having a number of LED units corresponding to the number of bits of the parallel data from the conversion circuit arranged in an array, wherein the LED units are controlled in light emission in parallel based on bit information of corresponding parallel data to emit optical information signals dispersed in a spatially predetermined range, and of a receiving apparatus having a plurality of photo-diodes arranged in an array for emitting electric signals of levels in accordance with amounts of light received, wherein the photo-diodes output electric signals in parallel.

Abstract: A receiving apparatus and transmitting apparatus capable of transmitting and receiving a high speed optical signal and a communication system using the same, including a transmitting apparatus having a conversion circuit for converting serially input data to a plurality of bits of parallel data given predetermined information and an LED array having a number of LED units corresponding to the number of bits of the parallel data from the conversion circuit arranged in an array, wherein the LED units are controlled in light emission in parallel based on bit information of corresponding parallel data to emit optical information signals dispersed in a spatially predetermined range, and of a receiving apparatus having a plurality of photo-diodes arranged in an array for emitting electric signals of levels in accordance with amounts of light received, wherein the photo-diodes output electric signals in parallel.

Abstract: The present invention has been developed considering the above-described problems and aims to provide various structures and applications for illuminative light communication. According to the first aspect of the prevent invention, a broadcast system includes an LED light source 115 for lighting, a power line 103 that supplies electric power to the LED light source 115, a data modulator 102 that modulates and multiplexes a plurality of pieces of data, superimposes the resulting signal on an electric power waveform, and then transmits the resulting superimposed signal waveform to the power line 103, and a filter 112 that selectively separates one or more of a plurality of pieces of modulated data on the power line so as to control light intensity or blinking of the LED light source. Data is transmitted through changes in light intensity or blinking of the LED light source.

Abstract: A receiving apparatus and transmitting apparatus capable of transmitting and receiving a high speed optical signal and a communication system using the same, including a transmitting apparatus having a conversion circuit for converting serially input data to a plurality of bits of parallel data given predetermined information and an LED array having a number of LED units corresponding to the number of bits of the parallel data from the conversion circuit arranged in an array, wherein the LED units are controlled in light emission in parallel based on bit information of corresponding parallel data to emit optical information signals dispersed in a spatially predetermined range, and of a receiving apparatus having a plurality of photo-diodes arranged in an array for emitting electric signals of levels in accordance with amounts of light received, wherein the photo-diodes output electric signals in parallel.