US20090297156A1 - Illuminative light communication system, lighting device and illuminative light source - Google Patents
Illuminative light communication system, lighting device and illuminative light source Download PDFInfo
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- US20090297156A1 US20090297156A1 US12/461,226 US46122609A US2009297156A1 US 20090297156 A1 US20090297156 A1 US 20090297156A1 US 46122609 A US46122609 A US 46122609A US 2009297156 A1 US2009297156 A1 US 2009297156A1
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Images
Classifications
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- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
- F21S8/08—Lighting devices intended for fixed installation with a standard
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- G—PHYSICS
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- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B27/00—Alarm systems in which the alarm condition is signalled from a central station to a plurality of substations
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- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/175—Controlling the light source by remote control
- H05B47/185—Controlling the light source by remote control via power line carrier transmission
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/65—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction specially adapted for changing the characteristics or the distribution of the light, e.g. by adjustment of parts
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- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
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- H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
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- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
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- H04B2203/5412—Methods of transmitting or receiving signals via power distribution lines by modofying wave form of the power source
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- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5429—Applications for powerline communications
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Definitions
- the present invention aims to provide an illuminative light communication system that does not require electrical work for providing a cable or an optical fiber, and prevents problems such as restriction on bandwidths, radio wave radiation, and superimposition of noise from developing, which is different than power line communication, and a lighting device and an illuminative light source used for such illuminative light communication system.
- an illuminative light communication system that carries out communication using illuminative light includes multiple lighting units that emit light for lighting and an optical communication unit that optically transmits data through the air to the lighting units.
- the lighting units receive light from the optical communication unit, thereby capturing data, and modulate emitted light in accordance with the data.
- an illuminative light communication system includes multiple lighting units that emit light for lighting; and an optical communication unit that optically transmits data through the air to one or more of the lighting units.
- the one or more of the lighting units receive light from the optical communication unit, thereby capturing data, and optically transmit the data through the air to another lighting unit.
- Each lighting unit modulates emitted light in accordance with the data received from the optical communication unit or another lighting unit and transmits the data via the modulated, emitted light.
- the plurality of lighting units allows optical bi-directional communication through the air with the optical communication unit or another lighting unit.
- the plurality of lighting units includes a light receiving unit that receives light modulated in accordance with data emitted from a terminal device, which receives emitted light and thereby receives data, optical bidirectional communication between the terminal device and the plurality of lighting units is possible.
- the plurality of lighting units uses a semiconductor light emitting device such as an LED as an illuminative light source.
- the plurality of lighting units can be an indoor illumination lamp or a street lamp.
- a lighting device used for such aforementioned illuminative light communication system includes one or multiple illuminative light emitting units that emits light for lighting, an optical transmitting/receiving unit for optically communicating through the air with a light emitting unit provided in a device, and a control unit that controls the illuminative light emitting unit in accordance with data received by the light transmitting/receiving unit, so as to modulate light emitted from the illuminative light emitting unit in accordance with the data, thereby transmitting the data.
- an illuminative light communication system can be constructed through simple electrical work such as replacement of an existing lighting device with a lighting device, according to the present invention.
- the optical transmitting/receiving unit is deployed in multiple positions in different communication directions, and data received by a certain light transmitting/receiving unit can be optically transmitted through the air from another light transmitting/receiving unit to the device.
- the lighting devices can be deployed freely, and data transmission is possible regardless of the positions of the lighting devices.
- the light transmitting/receiving unit allows bi-directional optical communication through the air with another device.
- the plurality of lighting units includes a light receiving unit that receives light modulated in accordance with data emitted from a terminal device, which receives emitted light and thereby receives data, optical bidirectional communication among the terminal device and the plurality of lighting units is possible.
- the plurality of illuminative light emitting units uses a semiconductor light emitting device such as an LED as an illuminative light source.
- the plurality of lighting units can be an indoor illumination lamp or a street lamp.
- an illuminative light source includes one or multiple illuminative light emitting devices that emits light for lighting, an optical transmitting/receiving unit for optically communicating through the air with a light emitting unit provided in another lighting unit, and a control unit that controls the illuminative light emitting device in accordance with data received by the optical transmitting/receiving unit, so as to modulate light emitted by the illuminative light emitting device in accordance with the data, thereby transmitting the data.
- the optical transmitting/receiving unit is deployed in multiple positions in different communication directions. Data received by a certain light transmitting/receiving unit can be optically transmitted through the air from another light transmitting/receiving unit to another device. In addition, by structuring the optical transmitting/receiving unit so as to be able to change an optical transmission/reception direction, deployment of them on arbitrarily positioned lighting devices becomes possible.
- the optical transmitting/receiving unit is deployed in plural; one is used, in the case of the plurality of illuminative light emitting devices being arranged, to allow optical communication through the air with an adjacent illuminative light source, while the other is used to allow optical communication through the air with another illuminative light source provided in another lighting unit.
- the optical transmitting/receiving unit can be structured allowing bidirectional optical communication through the air with another lighting unit. Furthermore, since the plurality of lighting units includes a light receiving unit that receives light modulated in accordance with data emitted from a terminal device, which receives emitted light and thereby receives data, optical bidirectional communication among the terminal device and the plurality of lighting units is possible.
- the illuminative light emitting device may be one or multiple semiconductor light emitting devices such as LEDs. Note that the illuminative light source may be an indoor illumination lamp or an outdoor street lamp.
- FIG. 1 is an explanatory diagram of an illuminative light communication system, according to a first embodiment of the present invention
- FIG. 2 is an explanatory diagram of an illuminative light communication system, according to a second embodiment of the present invention.
- FIG. 3 is an aerial view of an exemplary lighting element in the illuminative light communication system, according to the second embodiment of the present invention.
- FIGS. 4A and 4B each is an explanatory diagram of a first modified example of the illuminative light communication device, according to the second embodiment of the present invention.
- FIG. 4A is a cross-sectional view; and
- FIG. 4B is a perspective view;
- FIG. 5 is an explanatory diagram of a second modified example of the illuminative light communication system, according to the second embodiment of the present invention.
- FIG. 6 is an explanatory diagram of a third modified example of the illuminative light communication system, according to the second embodiment of the present invention.
- FIG. 7 is an explanatory diagram of an illuminative light communication system, according to a third embodiment of the present invention.
- FIG. 8 is another explanatory diagram of the illuminative light communication system, according to the third embodiment of the present invention.
- FIG. 9 is an explanatory diagram describing an exemplary illuminative light source in the illuminative light communication system, according to the third embodiment of the present invention.
- FIG. 10 is an explanatory diagram of an illuminative light communication system, according to a fourth embodiment of the present invention.
- FIG. 11 is an explanatory diagram describing an exemplary illuminative light source in the illuminative light communication system, according to the fourth embodiment of the present invention.
- FIG. 12 is an explanatory diagram of an illuminative light communication system, according to a fifth embodiment of the present invention.
- Lighting elements are provided on a ceiling, or a pole is provided for illuminating light from above so as to prevent shadows across a certain area.
- illuminative light communication in that high quality communication is possible because shadowing does not develop and high illuminative electric power is available.
- a method of superimposing a signal on an electric wire for lighting and transmitting the resulting data to lighting elements has been considered as a method not requiring provision of additional cables or optical fibers.
- undesired radio emission may often develop or wireless communication may be interrupted when the frequency of the signal is high.
- signals are easily influenced by motor noise and inverter noise.
- the present invention provides a preferred means for transmitting data to each lighting element.
- FIG. 1 is an explanatory diagram of an illuminative light communication system, according to a first embodiment of the present invention.
- 501 denotes an optical communication device
- 502 denotes lighting elements
- 503 denotes a terminal device
- 511 , 522 , and 531 denote light transmitting/receiving units
- 512 denotes a communication cable
- 521 denotes light emitting devices
- 523 denotes light reception devices.
- an illuminative light communication system is structured using lighting elements provided for indoor lighting.
- the optical communication device 501 which transmits to the lighting elements 502 data that is to be sent by them through illuminative light communication, is provided indoors.
- the optical communication device 501 is connected to the network, and transmits/receives data via the network.
- the network is a wired network, which is provided in offices, schools, plants, and homes, and is configured from an optical fiber, a coaxial cable, or a stranded wire, many of which are connected to an external telephone network or the Internet.
- a terminal of such network is often provided in a wall as shown in FIG. 1 . In such case, electrical connection between the wall surface terminal and the optical communication device 501 is made by the communication cable 512 .
- the optical communication device 501 allows communication via the network as described above, and has the light transmitting/receiving unit 511 allowing optical communication among the lighting elements 502 through the air. According to the present invention, since optical communication is carried out through the air, an optical fiber is unnecessary. Needless to say, it is unnecessary to extend the communication cable 512 to the respective lighting elements 502 . Since the lighting elements 502 are provided at a high position such as the ceiling, the optical communication device 501 may be provided at a lower position where the lighting elements 502 carrying out communication cannot be blinded.
- the light transmitting/receiving unit 511 includes a light emitting device and a light reception device, emits modulated light through control of the light emitting device to modulate in accordance with data, and transmits data to the lighting elements 502 .
- a light emitting device and a light reception device, emits modulated light through control of the light emitting device to modulate in accordance with data, and transmits data to the lighting elements 502 .
- the light reception device receives light emitted from the light transmitting/receiving units 522 of the lighting elements 502 , thereby receiving data transmitted from the lighting elements 502 . Note that since illuminative light emitted from the lighting elements 502 is received, it is necessary to separate and capture data from the light emitted from the light transmitting/receiving units 522 of the lighting element 502 . When it is unnecessary to receive data from the lighting elements 502 , the light reception device is unnecessary.
- the optical communication device 501 allows communication via the wired communication cable 512 and functions as a gateway, which carries out conversion for optical communication.
- the optical communication device 501 also functions as a base station for wireless (optical) communication.
- light used by the light transmitting/receiving unit 511 for communication is not limited to visible light, and infrared light is also available.
- the lighting elements 502 are provided on the ceiling, for example, and illuminates indoors by light emitted from the light emitting device.
- the lighting elements 502 are each provided with light transmitting/receiving units 522 including light emitting devices and light reception devices.
- optical communication with the optical communication device 501 through the air is carried out.
- the light emitting devices should be formed so as to allow pinpoint reception of light from the light transmitting/receiving unit 511 of the optical communication device 501 by providing a lens system, for example. Needless to say, direction should be appropriately changeable in consideration of light incident direction.
- the light emitting devices are provided for transmitting data to the optical communication device 501 from the lighting elements 502 , and should allow pinpoint transmission of light to the light transmitting/receiving unit 511 of the optical communication device 501 .
- a rectilinear progression characteristic may improve, and identifiability of the optical communication device 501 may be improved by coherent light.
- These light transmitting/receiving units 522 allow bidirectional data communication among the lighting elements 502 and the optical communication device 501 .
- the lighting elements 502 are each provided with a controller not shown in the drawing.
- the light transmitting/receiving units 522 receive and demodulate light, and the resulting demodulated data is transmitted to corresponding controller.
- the controller controls the light emitting devices 521 to modulate in accordance with received data and emits illuminative light modulated in accordance with that data. This allows illuminative light data transmission from the lighting elements 502 to the terminal device 503 .
- the light emitting devices 521 are indicated by o symbols, and the light reception devices 523 indicated by • symbols are provided therebetween. Since the light emitting devices 521 , which are used for lighting as described above, emit light modulated in accordance with data, those having a high-speed response characteristic are available. For example, semiconductor light emitting devices such as LEDs and LDs are optimum.
- the light reception devices 523 are used for receiving light from the terminal device 503 . They receive and demodulate modulated light emitted from the terminal device 503 , and the controller can then capture data transmitted from the terminal device 503 . The captured data may be optically transmitted from the light transmitting/receiving units 522 to the optical communication device 501 , and then to the network. Those light reception devices 523 allow bidirectional communication among the lighting elements 502 and the terminal device 503 . Note that those light reception devices 523 may receive infrared light, other than visible light. In addition, a structure such that an antenna is provided instead of the light reception devices 523 for radio wave data reception from the terminal device 503 is possible. In the case of a broadcast system, the light reception devices 523 are unnecessary.
- the terminal device 503 is a data terminal comprising the light transmitting/receiving unit 531 .
- the light transmitting/receiving unit 531 receives and demodulates illuminative light, thereby capturing data.
- the light transmitting/receiving unit 531 is controlled to emit light modulated in accordance with data, thereby transmitting data from the terminal device 503 to the lighting elements 502 .
- the terminal device 503 may be provided in an arbitrary position as long as it is illuminated by the lighting elements 502 . Accordingly, communication is possible even if the terminal device 503 is movable.
- the lighting elements are typically provided so as to prevent shadows, and illuminative light has large electric power, high quality and high speed communication is possible.
- illuminative light may be used safely without adversely influencing the human body such as eyes as with infrared rays.
- the optical communication device 501 controls the light transmitting/receiving unit 511 to emit light, thereby optically transmitting data, which has been transmitted from the network, through the air.
- the respective light transmitting/receiving units 522 of the lighting elements 502 receive light emitted from the light transmitting/receiving unit 511 of the optical communication device 501 , thereby receiving data.
- the respective lighting elements 502 then control the light emitting devices 521 to modulate in accordance with data captured through reception of light by the light transmitting/receiving units 522 , and thereby outputting the modulated illuminative light.
- the terminal device 503 receives and demodulates the modulated illuminative light, and thus the terminal device 503 can receive data.
- the light transmitting/receiving unit 531 of the terminal device 503 emits light modulated in accordance with data in the terminal device 503 .
- the light reception devices 523 of the lighting devices 502 then receive that emitted light, thereby receiving that data.
- the light transmitting/receiving units 522 of the lighting devices 502 then emit light modulated in accordance with that received data, transmitting the data to the optical communication device 501 .
- the light transmitting/receiving unit 511 receives modulated light from the lighting elements 502 and converts it to electrical signals, transmitting the resulting signals to the network. This allows data transmission from the terminal device 503 to the network.
- FIG. 2 is an explanatory diagram of an illuminative light communication device, according to a second embodiment of the present invention.
- FIG. 3 is a planar view of an exemplary lighting element, according to the second embodiment of the present invention.
- 502 - 1 through 502 - 4 denote lighting elements
- 541 denotes sockets
- 542 denotes rod-shaped illuminative light sources.
- the aforementioned first embodiment gives an example where the lighting elements 502 receive modulated light from the optical communication device 501 , respectively.
- the second embodiment shows a case of data transmission among the lighting elements 502 - 1 through 502 - 4 .
- the light emitting devices 521 are arranged in the lighting elements 502 - 1 through 502 - 4 so as to form the same shape as typically used strip lights.
- the lighting elements 502 - 1 through 502 - 4 are identical lighting elements, which are referred to as lighting elements 502 when they are not being differentiated.
- light transmitting/receiving units 522 are provided on all four sides of the lighting elements 502 , and allow communication among the lighting elements 502 .
- only the light transmitting/receiving units 522 of any one or multiple lighting elements 502 communicate with the optical communication device 501 .
- Other lighting elements 502 which do not communicate directly with the optical communication device 501 , transmit/receive data by communicating with another lighting element 502 .
- the lighting element 502 - 1 communicates directly with the optical communication device 501 .
- the lighting elements 502 - 2 and 502 - 3 communicate with the lighting element 502 - 1 to receive/transmit data from/to the optical communication device 501 .
- the lighting element 502 - 4 communicates with the lighting element 502 - 2 or 502 - 3 to receive/transmit data from/to the optical communication device 501 .
- data from the optical communication device 501 is transmitted to the lighting element 502 - 1 , and that transmitted data is then transmitted to the lighting elements 502 - 2 and 502 - 3 .
- the data is then transmitted from the lighting element 502 - 2 or 502 - 3 to the lighting element 502 - 4 .
- the data from the optical communication device 501 is transmitted to the lighting elements 502 - 1 through 502 - 4 , and the respective lighting elements 502 - 1 through 502 - 4 transmit data via illuminative light to the terminal device 503 .
- the lighting element 502 - 4 receives modulated light from the terminal device 503
- the lighting element 502 - 4 transmits that data to the lighting element 502 - 2 or 502 - 3
- the lighting element 502 - 2 or 502 - 3 transmits that data to the lighting element 502 - 1
- the lighting element 502 - 1 transmits that data to the optical communication device 501
- the data is then transmitted to the network.
- the light transmitting/receiving units 522 are used for optical communication among the respective lighting elements 502 through the air. This allows communication from the optical communication device 501 to the respective lighting elements 502 without providing a communication cable or an optical fiber.
- the respective lighting elements 502 are provided at almost regular intervals, communication quality does not decrease due to locations of the lighting elements 502 .
- the lighting elements 502 since data is transmitted through communication among the lighting elements 502 , even the lighting elements 502 provided within an area visible from the optical communication device 501 may be used for illuminative light communication, which is possible by communicating indirectly with the optical communication device 501 through communication with another lighting element 502 .
- the light transmitting/receiving units 522 allow bi-directional communication among the lighting elements 502 and among the lighting elements 502 and the optical communication device 501 .
- the light transmitting/receiving units 522 may be constituted by either light emitting devices or light reception devices, and light emitting devices and light reception devices of the respective lighting elements 502 for data communication should be provided facing one another.
- the rod illuminative light sources 542 with the same shape as strip lights as shown in FIG. 3 are used.
- One or several lines of light emitting devices 521 are arranged in the rod illuminative light sources 542 , and light reception devices 523 are provided therebetween.
- the shape of illuminative light source is arbitrary and is determined based on illuminative light source and design. However, if an existing lighting element is used, it is desirable that the rod-shaped illuminative light sources 542 with the same shape as strip lights are used.
- the rod illuminative light sources 542 are inserted into the fluorescent sockets 541 , electric power is supplied to the rod illuminative light sources 542 , allowing lighting.
- a controller not shown in the drawing is provided in each of the rod illuminative light sources 542 .
- the light transmitting/receiving units 522 should be provided surrounding the existing lighting elements and be electrically connected to the rod illuminative light sources 542 .
- the lighting elements may be provided using existing lighting elements. Use of existing lighting elements allows illuminative light communication at lower cost than that for replacement with new lighting elements.
- the shape of the illuminative light source is not limited to the same rod shape as strip lights and may have a circular shape as with circular fluorescent lamps.
- an electric bulb-shaped illuminative light source is available, as described later.
- FIGS. 4A and 4B each is an explanatory diagram of a first modified example of the illuminative light communication system, according to the second embodiment of the present invention.
- the lighting elements are provided on the ceiling.
- the lighting elements 502 may be embedded in the ceiling as shown in FIGS. 4A and FIG. 4B .
- the light transmitting/receiving units 522 are provided protruding from the ceiling, allowing optical communication among the lighting elements 502 .
- FIG. 5 is an explanatory diagram of a second modified example of the illuminative light communication system, according to the second embodiment of the present invention.
- the lighting elements 502 are also embedded in the ceiling.
- a structure that utilizes this space under the roof to provide the light transmitting/receiving units 522 under the roof for communication among the lighting elements 502 and among the lighting elements 502 and the optical communication device 501 is possible.
- FIG. 6 is an explanatory diagram of a third modified example of the illuminative light communication system, according to the second embodiment of the present invention.
- the example shown in FIG. 6 shows a case of using suspended shades as the lighting elements 502 .
- electric bulbs are often used as the light sources.
- electric bulb-shaped illuminative light sources are used.
- the light transmitting/receiving units 522 are provided at the upper part of underneath the shades of the lighting elements 502 . Needless to say, the positions of the light transmitting/receiving units 522 may be arbitrary as long as communication with other lighting elements 502 and with the optical communication device 501 is possible.
- the suspended lighting elements 502 are often provided over each customer's seat in a store.
- the structure shown in FIG. 6 is useful for such application.
- broadband communication may be provided merely through optical communication among the lighting elements 502 and among the lighting elements 502 and the optical communication device 501 without providing cables in the store.
- FIGS. 7 and 8 are explanatory diagrams of an illuminative light communication system, according to a third embodiment of the present invention.
- FIG. 9 is a diagram describing an exemplary illuminative light source, according to the third embodiment of the present invention.
- 551 denotes illuminative light sources
- 552 denotes inter-adjacent light source light transmitting/receiving units
- 553 denotes inter-lighting element light transmitting/receiving units.
- the light transmitting/receiving units 522 must be provided in addition to the illuminative light sources even when using the existing lighting elements.
- the third embodiment shows an exemplary structure where the illuminative light sources and the light transmitting/receiving units 522 are integrated.
- the shape of the illuminative light sources 551 is the same rod shape as strip lights as with the example shown in FIG. 3 .
- the illuminative light sources 551 each comprises light emitting devices 521 , light reception devices 523 , and a controller not shown in the drawing.
- the inter-adjacent light source light transmitting/receiving units 552 are provided on the tube and are used for communication between adjacent illuminative light sources 551 when the illuminative light sources 551 are positioned so as to provide multiple fluorescent lamps in parallel. Note that assuming the case of providing three or more of illuminative light sources 551 , the inter-adjacent light source light transmitting/receiving units 552 should be provided on both sides of the tube.
- the inter-lighting element light transmitting/receiving units 553 are provided for communicating with illuminative light sources 551 other than the adjacent illuminative light sources 551 and the optical communication device 501 .
- the inter-lighting element light transmitting/receiving units 553 should be formed such that the length and orientation thereof are adjustable to accommodate various lighting elements. Note that in FIG. 9 , the inter-lighting element light transmitting/receiving units 553 are provided at both ends; alternatively they may be provided at either end.
- Such illuminative light sources 551 are fixed replacing the existing fluorescent lamps of the lighting elements.
- the illuminative light sources 551 should be attached directly to the sockets to which fluorescent lamps are inserted.
- electric power may be supplied to the illuminative light sources 551 from the sockets of the lighting elements.
- Illuminative light data transmission is possible by regulating the length and orientation of the inter-lighting element light transmitting/receiving units 553 .
- FIG. 7 shows an application to the first embodiment according to the present invention shown in FIG. 1 .
- the inter-lighting element light transmitting/receiving units 553 attached to the respective illuminative light sources 551 should face the optical communication device 501 .
- the inter-lighting element light transmitting/receiving units 553 may be provided in a single illuminative light source 551 of the respective lighting elements, and the inter-adjacent light source light transmitting/receiving units 552 may be used for data communication for the other illuminative light sources.
- FIG. 8 shows an application to the second embodiment according to the present invention shown in FIG. 234 .
- the optical communication device 501 communicates with the inter-lighting element light transmitting/receiving units 553 provided in a certain illuminative light source 551 and communicates with the inter-adjacent light source light transmitting/receiving units 552 or the inter-lighting element light transmitting/ receiving units 553 for the other illuminative light sources 551 .
- illuminative light communication for all illuminative light sources 551 is possible. Needless to say, multiple communication routes may be specified.
- FIGS. 7 and 8 show a case of attaching the illuminative light sources 551 to the lighting elements embedded in the ceiling.
- the inter-lighting element light transmitting/receiving units 553 are provided protruding downward as shown in the drawings.
- surrounding shades extend below the illuminative light sources 551 .
- the inter-lighting element light transmitting/receiving units 553 are provided protruding downward.
- FIG. 10 is an explanatory diagram of an illuminative light communication system, according to a fourth embodiment of the present invention.
- FIG. 11 is a diagram describing an exemplary illuminative light source, according to the fourth embodiment of the present invention.
- the light transmitting/receiving units 522 are not provided in the illuminative light sources 551 or in the lighting elements 502 , and the light emitting devices 521 and the light reception devices 523 are alternatively used.
- the illuminative light sources 551 which comprise the light emitting devices 521 and the light reception devices 523 as shown in FIG. 11 , are used and attached to the existing lighting elements, thereby constituting the illuminative light communication system.
- the inter-adjacent lighting source light transmitting/receiving units 552 and the inter-lighting element light transmitting/receiving units 553 are not provided in the exemplary illuminative light sources 551 shown in FIG. 11 .
- the light reception devices 523 receive light (visible light or infrared light) emitted from the light transmitting/receiving unit 511 of the optical communication device 501 , thereby receiving data from the optical communication device 501 .
- Light emitted from the light emitting devices 521 is modulated in accordance with the received data, and the resulting modulated illuminative light is emitted.
- the terminal device 503 then receives and demodulates the modulated illuminative light, allowing the terminal device 503 to receive data.
- the light reception devices 523 in the illuminative light sources 551 receive and demodulate modulated light emitted from the terminal device 503 , and then data from the terminal device 503 is transmitted to the illuminative light sources 551 .
- Light emitted from the light emitting devices 521 is modulated in accordance with the received data, and the resulting modulated illuminative light is emitted. If the light transmitting/receiving unit 511 of the optical communication device 501 receives and demodulates the modulated illuminative light, data is transmitted from the terminal device 503 to the optical communication device 501 .
- both the optical communication device 501 and the terminal device 503 emit light to the illuminative light sources 551 , and receive illuminative light emitted from the illuminative light sources 551 .
- This allows use of illuminative light having large electric power and reduction in influences of shadowing since the lighting elements are provided in the ceiling where shadows are difficult to generate, thereby providing favorable communication rather than the case of direct optical communication between the optical communication device 501 and the terminal device 503 . Needless to say, it is unnecessary to extend a communication cable or an optical cable to the lighting elements 502 .
- FIG. 12 is an explanatory diagram of an illuminative light communication system, according to a fifth embodiment of the present invention.
- 561 denotes street lights.
- a mercury lamp, a sodium lamp, or a fluorescent lamp is mainly used as the street lights 561 on a road.
- a semiconductor light emitting device such as an LED may be applied.
- various pieces of data may be transmitted through illuminative light to moving vehicles and pedestrians. In this case, it is costly to provide a communication cable or an optical cable to transmit data to the respective street lights 561 .
- the light transmitting/receiving units 522 are provided in the street lights 561 , and optical data communication among the street lights 561 is provided through the air as with the aforementioned second embodiment.
- This allows data transmission to the respective street lights 561 and illuminative light data transmission by the street lights 561 .
- Such structure is economical since only electrical work for the respective street lights 561 is necessary without providing a communication cable or an optical fiber.
- the intervals between the street lights 561 for example, of approximately 30 m on an expressway are longer than in the aforementioned case of indoors.
- optical communication is sufficiently possible.
- the orientation of the light transmitting/receiving units 522 must be regulated so as for those units to face adjacent street lights. This is not very difficult as long as they have typical intervals between adjacent street lights.
- a problem that the field of vision may be obstructed by mist is expected. However, this is not a significant problem since the intervals are approximately 30 m.
- An example of optical communication among the street lights provided on the road is shown as an outdoor network herein, and an application according to the present invention is not limited to this. For example, it is applicable to taxiway lights for air crafts or illumination lamps in event halls.
- data is transmitted from the optical communication device 501 to the lighting elements 502 , the illuminative light sources 551 , or the street lights 561 (referred to as lighting elements and the like). It is unnecessary for the respective lighting elements and the like to transmit received data as is through illuminative light.
- a structure such that an address or an ID is attached to a header of data to be transmitted and that the lighting elements and the like select data in accordance with that header and transmit the selected data via illuminative light is possible.
- the lighting elements and the like which function as a relay or a router and are not used for illuminative light data communication, may be provided.
- the present invention when each of lighting elements and illuminative light sources are used for optical communication, data is transmitted thereto through the air. Therefore, electrical work for providing a communication cable or an optical fiber is unnecessary, allowing constituting an illuminative light communication system at low cost. In this case, the system may be structured using existing lighting elements, allowing further reduction in cost. In addition, different from power line communication, optical communication prevents problems such as constraints on bandwidth, radio wave radiation, and superimposition of noise from developing, allowing high-quality data communication.
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.
Description
- This application is a continuation of U.S patent application Ser. No. 10/532,250 filed Oct. 23, 2003, as International Application No. PCT/JP03/013539, now pending, the contents of which, including specification, claims and drawings, are incorporated herein by reference in their entirety. This application claims priority from Japanese Patent Application Ser. No. 2003-084819 filed Mar. 26, 2003, the contents of which are incorporated herein by reference in their entireties.
- The present invention aims to provide an illuminative light communication system that does not require electrical work for providing a cable or an optical fiber, and prevents problems such as restriction on bandwidths, radio wave radiation, and superimposition of noise from developing, which is different than power line communication, and a lighting device and an illuminative light source used for such illuminative light communication system.
- According to such objective, an illuminative light communication system that carries out communication using illuminative light includes multiple lighting units that emit light for lighting and an optical communication unit that optically transmits data through the air to the lighting units. The lighting units receive light from the optical communication unit, thereby capturing data, and modulate emitted light in accordance with the data. According to such objective, an illuminative light communication system includes multiple lighting units that emit light for lighting; and an optical communication unit that optically transmits data through the air to one or more of the lighting units. The one or more of the lighting units receive light from the optical communication unit, thereby capturing data, and optically transmit the data through the air to another lighting unit. Each lighting unit modulates emitted light in accordance with the data received from the optical communication unit or another lighting unit and transmits the data via the modulated, emitted light.
- With such structure, data to be transmitted to the lighting unit that allows communication through modulating illuminative light is transmitted through the air from the optical communication unit or another peripheral lighting unit. When using an optical fiber for optical communication, it is necessary to provide the optical fiber. On the other hand, it is unnecessary when carrying out optical communication via the air. As a result, the illuminative light communication system can be constructed very easily. In addition, different than power line communication, problems such as restriction on bandwidths and radio wave radiation do not develop.
- Note that the plurality of lighting units allows optical bi-directional communication through the air with the optical communication unit or another lighting unit. In addition, since the plurality of lighting units includes a light receiving unit that receives light modulated in accordance with data emitted from a terminal device, which receives emitted light and thereby receives data, optical bidirectional communication between the terminal device and the plurality of lighting units is possible. Furthermore, the plurality of lighting units uses a semiconductor light emitting device such as an LED as an illuminative light source. The plurality of lighting units can be an indoor illumination lamp or a street lamp.
- A lighting device used for such aforementioned illuminative light communication system includes one or multiple illuminative light emitting units that emits light for lighting, an optical transmitting/receiving unit for optically communicating through the air with a light emitting unit provided in a device, and a control unit that controls the illuminative light emitting unit in accordance with data received by the light transmitting/receiving unit, so as to modulate light emitted from the illuminative light emitting unit in accordance with the data, thereby transmitting the data.
- With such structure, since there is no need to provide a cable or an optical fiber as described above, an illuminative light communication system can be constructed through simple electrical work such as replacement of an existing lighting device with a lighting device, according to the present invention.
- Note that the optical transmitting/receiving unit is deployed in multiple positions in different communication directions, and data received by a certain light transmitting/receiving unit can be optically transmitted through the air from another light transmitting/receiving unit to the device. As a result, the lighting devices can be deployed freely, and data transmission is possible regardless of the positions of the lighting devices. In addition, the light transmitting/receiving unit allows bi-directional optical communication through the air with another device. Furthermore, since the plurality of lighting units includes a light receiving unit that receives light modulated in accordance with data emitted from a terminal device, which receives emitted light and thereby receives data, optical bidirectional communication among the terminal device and the plurality of lighting units is possible. The plurality of illuminative light emitting units uses a semiconductor light emitting device such as an LED as an illuminative light source. The plurality of lighting units can be an indoor illumination lamp or a street lamp.
- Furthermore, an illuminative light source includes one or multiple illuminative light emitting devices that emits light for lighting, an optical transmitting/receiving unit for optically communicating through the air with a light emitting unit provided in another lighting unit, and a control unit that controls the illuminative light emitting device in accordance with data received by the optical transmitting/receiving unit, so as to modulate light emitted by the illuminative light emitting device in accordance with the data, thereby transmitting the data.
- In this manner, by providing the optical transmitting/receiving unit and the control unit in the illuminative light source, construction of an illuminative light communication system using the existing lighting device, merely with simple electrical work such as replacement of a fluorescent lamp or an electric bulb with an illuminative light source according to the present invention becomes possible.
- The optical transmitting/receiving unit is deployed in multiple positions in different communication directions. Data received by a certain light transmitting/receiving unit can be optically transmitted through the air from another light transmitting/receiving unit to another device. In addition, by structuring the optical transmitting/receiving unit so as to be able to change an optical transmission/reception direction, deployment of them on arbitrarily positioned lighting devices becomes possible. Furthermore, as with a lighting device using a fluorescent lamp, the optical transmitting/receiving unit is deployed in plural; one is used, in the case of the plurality of illuminative light emitting devices being arranged, to allow optical communication through the air with an adjacent illuminative light source, while the other is used to allow optical communication through the air with another illuminative light source provided in another lighting unit.
- With such an illuminative light source, the optical transmitting/receiving unit can be structured allowing bidirectional optical communication through the air with another lighting unit. Furthermore, since the plurality of lighting units includes a light receiving unit that receives light modulated in accordance with data emitted from a terminal device, which receives emitted light and thereby receives data, optical bidirectional communication among the terminal device and the plurality of lighting units is possible. The illuminative light emitting device may be one or multiple semiconductor light emitting devices such as LEDs. Note that the illuminative light source may be an indoor illumination lamp or an outdoor street lamp.
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FIG. 1 is an explanatory diagram of an illuminative light communication system, according to a first embodiment of the present invention; -
FIG. 2 is an explanatory diagram of an illuminative light communication system, according to a second embodiment of the present invention; -
FIG. 3 is an aerial view of an exemplary lighting element in the illuminative light communication system, according to the second embodiment of the present invention; -
FIGS. 4A and 4B each is an explanatory diagram of a first modified example of the illuminative light communication device, according to the second embodiment of the present invention;FIG. 4A is a cross-sectional view; andFIG. 4B is a perspective view; -
FIG. 5 is an explanatory diagram of a second modified example of the illuminative light communication system, according to the second embodiment of the present invention; -
FIG. 6 is an explanatory diagram of a third modified example of the illuminative light communication system, according to the second embodiment of the present invention; -
FIG. 7 is an explanatory diagram of an illuminative light communication system, according to a third embodiment of the present invention; -
FIG. 8 is another explanatory diagram of the illuminative light communication system, according to the third embodiment of the present invention; -
FIG. 9 is an explanatory diagram describing an exemplary illuminative light source in the illuminative light communication system, according to the third embodiment of the present invention; -
FIG. 10 is an explanatory diagram of an illuminative light communication system, according to a fourth embodiment of the present invention; -
FIG. 11 is an explanatory diagram describing an exemplary illuminative light source in the illuminative light communication system, according to the fourth embodiment of the present invention; and -
FIG. 12 is an explanatory diagram of an illuminative light communication system, according to a fifth embodiment of the present invention. - Lighting elements are provided on a ceiling, or a pole is provided for illuminating light from above so as to prevent shadows across a certain area. There is an advantage for illuminative light communication in that high quality communication is possible because shadowing does not develop and high illuminative electric power is available.
- Meanwhile, since lighting elements are provided in high places such as the ceiling as described above, there is a problem that it is difficult to carry out electrical work. For example, in the case of the aforementioned illuminative light communication, data to be transmitted must be sent to the lighting elements through illuminative light communication. A method of providing a cable or an optical fiber for a network may be considered as a method for transmitting data to lighting elements, for example. However, since new electrical work is necessary for providing a cable or an optical fiber, usage of illuminative light communication is not easy and is costly.
- As with the present invention, a method of superimposing a signal on an electric wire for lighting and transmitting the resulting data to lighting elements, for example, has been considered as a method not requiring provision of additional cables or optical fibers. However, in the case of transmitting data by superimposing a signal on an electric wire, undesired radio emission may often develop or wireless communication may be interrupted when the frequency of the signal is high. In addition, there is another problem in that signals are easily influenced by motor noise and inverter noise.
- As described above, there have been no preferred means for transmitting data to lighting elements for illuminative light communication, which has been an obstacle to illuminative light communication. The present invention provides a preferred means for transmitting data to each lighting element.
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FIG. 1 is an explanatory diagram of an illuminative light communication system, according to a first embodiment of the present invention. In the drawing, 501 denotes an optical communication device, 502 denotes lighting elements, 503 denotes a terminal device, 511, 522, and 531 denote light transmitting/receiving units, 512 denotes a communication cable, 521 denotes light emitting devices, and 523 denotes light reception devices. In the example shown inFIG. 1 , an illuminative light communication system is structured using lighting elements provided for indoor lighting. - The
optical communication device 501, which transmits to thelighting elements 502 data that is to be sent by them through illuminative light communication, is provided indoors. Theoptical communication device 501 is connected to the network, and transmits/receives data via the network. The network is a wired network, which is provided in offices, schools, plants, and homes, and is configured from an optical fiber, a coaxial cable, or a stranded wire, many of which are connected to an external telephone network or the Internet. A terminal of such network is often provided in a wall as shown inFIG. 1 . In such case, electrical connection between the wall surface terminal and theoptical communication device 501 is made by thecommunication cable 512. - The
optical communication device 501 allows communication via the network as described above, and has the light transmitting/receivingunit 511 allowing optical communication among thelighting elements 502 through the air. According to the present invention, since optical communication is carried out through the air, an optical fiber is unnecessary. Needless to say, it is unnecessary to extend thecommunication cable 512 to therespective lighting elements 502. Since thelighting elements 502 are provided at a high position such as the ceiling, theoptical communication device 501 may be provided at a lower position where thelighting elements 502 carrying out communication cannot be blinded. - The light transmitting/receiving
unit 511 includes a light emitting device and a light reception device, emits modulated light through control of the light emitting device to modulate in accordance with data, and transmits data to thelighting elements 502. In this example, it is desirable that lights emitted from the light emitting device may be received by themultiple lighting elements 502. Therefore, light with poor directivity is preferable. Alternatively, it is possible to output to therespective lighting elements 502 emitted lights with high directivity, which allows identification of eachlighting element 502. - The light reception device receives light emitted from the light transmitting/receiving
units 522 of thelighting elements 502, thereby receiving data transmitted from thelighting elements 502. Note that since illuminative light emitted from thelighting elements 502 is received, it is necessary to separate and capture data from the light emitted from the light transmitting/receivingunits 522 of thelighting element 502. When it is unnecessary to receive data from thelighting elements 502, the light reception device is unnecessary. - With such structure, the
optical communication device 501 allows communication via thewired communication cable 512 and functions as a gateway, which carries out conversion for optical communication. In addition, through communication withmultiple lighting elements 502, it also functions as a base station for wireless (optical) communication. Note that light used by the light transmitting/receivingunit 511 for communication is not limited to visible light, and infrared light is also available. - The
lighting elements 502, according to the present invention, are provided on the ceiling, for example, and illuminates indoors by light emitted from the light emitting device. Thelighting elements 502 are each provided with light transmitting/receivingunits 522 including light emitting devices and light reception devices. According to this embodiment, optical communication with theoptical communication device 501 through the air is carried out. The light emitting devices should be formed so as to allow pinpoint reception of light from the light transmitting/receivingunit 511 of theoptical communication device 501 by providing a lens system, for example. Needless to say, direction should be appropriately changeable in consideration of light incident direction. The light emitting devices are provided for transmitting data to theoptical communication device 501 from thelighting elements 502, and should allow pinpoint transmission of light to the light transmitting/receivingunit 511 of theoptical communication device 501. For example, when using laser diodes (LDs), a rectilinear progression characteristic may improve, and identifiability of theoptical communication device 501 may be improved by coherent light. These light transmitting/receivingunits 522 allow bidirectional data communication among thelighting elements 502 and theoptical communication device 501. - The
lighting elements 502 are each provided with a controller not shown in the drawing. The light transmitting/receivingunits 522 receive and demodulate light, and the resulting demodulated data is transmitted to corresponding controller. The controller controls thelight emitting devices 521 to modulate in accordance with received data and emits illuminative light modulated in accordance with that data. This allows illuminative light data transmission from thelighting elements 502 to theterminal device 503. - In the example shown in
FIG. 1 , thelight emitting devices 521 are indicated by o symbols, and thelight reception devices 523 indicated by • symbols are provided therebetween. Since thelight emitting devices 521, which are used for lighting as described above, emit light modulated in accordance with data, those having a high-speed response characteristic are available. For example, semiconductor light emitting devices such as LEDs and LDs are optimum. - The
light reception devices 523 are used for receiving light from theterminal device 503. They receive and demodulate modulated light emitted from theterminal device 503, and the controller can then capture data transmitted from theterminal device 503. The captured data may be optically transmitted from the light transmitting/receivingunits 522 to theoptical communication device 501, and then to the network. Thoselight reception devices 523 allow bidirectional communication among thelighting elements 502 and theterminal device 503. Note that thoselight reception devices 523 may receive infrared light, other than visible light. In addition, a structure such that an antenna is provided instead of thelight reception devices 523 for radio wave data reception from theterminal device 503 is possible. In the case of a broadcast system, thelight reception devices 523 are unnecessary. - The
terminal device 503 is a data terminal comprising the light transmitting/receivingunit 531. The light transmitting/receivingunit 531 receives and demodulates illuminative light, thereby capturing data. In addition, the light transmitting/receivingunit 531 is controlled to emit light modulated in accordance with data, thereby transmitting data from theterminal device 503 to thelighting elements 502. Theterminal device 503 may be provided in an arbitrary position as long as it is illuminated by thelighting elements 502. Accordingly, communication is possible even if theterminal device 503 is movable. In addition, since the lighting elements are typically provided so as to prevent shadows, and illuminative light has large electric power, high quality and high speed communication is possible. Furthermore, illuminative light may be used safely without adversely influencing the human body such as eyes as with infrared rays. - In the aforementioned first embodiment, the
optical communication device 501 controls the light transmitting/receivingunit 511 to emit light, thereby optically transmitting data, which has been transmitted from the network, through the air. The respective light transmitting/receivingunits 522 of thelighting elements 502 receive light emitted from the light transmitting/receivingunit 511 of theoptical communication device 501, thereby receiving data. Therespective lighting elements 502 then control thelight emitting devices 521 to modulate in accordance with data captured through reception of light by the light transmitting/receivingunits 522, and thereby outputting the modulated illuminative light. Theterminal device 503 receives and demodulates the modulated illuminative light, and thus theterminal device 503 can receive data. - On the other hand, the light transmitting/receiving
unit 531 of theterminal device 503 emits light modulated in accordance with data in theterminal device 503. Thelight reception devices 523 of thelighting devices 502 then receive that emitted light, thereby receiving that data. The light transmitting/receivingunits 522 of thelighting devices 502 then emit light modulated in accordance with that received data, transmitting the data to theoptical communication device 501. In theoptical communication device 501, the light transmitting/receivingunit 511 receives modulated light from thelighting elements 502 and converts it to electrical signals, transmitting the resulting signals to the network. This allows data transmission from theterminal device 503 to the network. -
FIG. 2 is an explanatory diagram of an illuminative light communication device, according to a second embodiment of the present invention.FIG. 3 is a planar view of an exemplary lighting element, according to the second embodiment of the present invention. In the drawings, the same symbols are given to the same parts as those inFIG. 1 , and repetitive descriptions thereof are thus omitted. 502-1 through 502-4 denote lighting elements, 541 denotes sockets, and 542 denotes rod-shaped illuminative light sources. The aforementioned first embodiment gives an example where thelighting elements 502 receive modulated light from theoptical communication device 501, respectively. On the other hand, the second embodiment shows a case of data transmission among the lighting elements 502-1 through 502-4. In addition, different from the example shown inFIG. 1 , thelight emitting devices 521 are arranged in the lighting elements 502-1 through 502-4 so as to form the same shape as typically used strip lights. Note that the lighting elements 502-1 through 502-4 are identical lighting elements, which are referred to aslighting elements 502 when they are not being differentiated. - In the second embodiment, as shown in
FIG. 3 , light transmitting/receivingunits 522 are provided on all four sides of thelighting elements 502, and allow communication among thelighting elements 502. In addition, only the light transmitting/receivingunits 522 of any one ormultiple lighting elements 502 communicate with theoptical communication device 501.Other lighting elements 502, which do not communicate directly with theoptical communication device 501, transmit/receive data by communicating with anotherlighting element 502. - In the example shown in
FIG. 2 , the lighting element 502-1 communicates directly with theoptical communication device 501. The lighting elements 502-2 and 502-3 communicate with the lighting element 502-1 to receive/transmit data from/to theoptical communication device 501. The lighting element 502-4 communicates with the lighting element 502-2 or 502-3 to receive/transmit data from/to theoptical communication device 501. For example, data from theoptical communication device 501 is transmitted to the lighting element 502-1, and that transmitted data is then transmitted to the lighting elements 502-2 and 502-3. The data is then transmitted from the lighting element 502-2 or 502-3 to the lighting element 502-4. As a result, the data from theoptical communication device 501 is transmitted to the lighting elements 502-1 through 502-4, and the respective lighting elements 502-1 through 502-4 transmit data via illuminative light to theterminal device 503. On the other hand, when the lighting element 502-4 receives modulated light from theterminal device 503, the lighting element 502-4 transmits that data to the lighting element 502-2 or 502-3, the lighting element 502-2 or 502-3 transmits that data to the lighting element 502-1, the lighting element 502-1 transmits that data to theoptical communication device 501, and the data is then transmitted to the network. - The light transmitting/receiving
units 522 are used for optical communication among therespective lighting elements 502 through the air. This allows communication from theoptical communication device 501 to therespective lighting elements 502 without providing a communication cable or an optical fiber. In addition, with the first embodiment, it can be considered that light intensity for communication among theoptical communication device 501 and thelighting elements 502 attenuates if thelighting elements 502 are provided at a distance from theoptical communication device 501. On the other hand, with the second embodiment, since therespective lighting elements 502 are provided at almost regular intervals, communication quality does not decrease due to locations of thelighting elements 502. Furthermore, since data is transmitted through communication among thelighting elements 502, even thelighting elements 502 provided within an area visible from theoptical communication device 501 may be used for illuminative light communication, which is possible by communicating indirectly with theoptical communication device 501 through communication with anotherlighting element 502. - The light transmitting/receiving
units 522 allow bi-directional communication among thelighting elements 502 and among thelighting elements 502 and theoptical communication device 501. Note that in the case of unidirectional communication as with a broadcast system, the light transmitting/receivingunits 522 may be constituted by either light emitting devices or light reception devices, and light emitting devices and light reception devices of therespective lighting elements 502 for data communication should be provided facing one another. - In the second embodiment, the rod illuminative
light sources 542 with the same shape as strip lights as shown inFIG. 3 are used. One or several lines of light emittingdevices 521 are arranged in the rod illuminativelight sources 542, andlight reception devices 523 are provided therebetween. To provide a new lighting element, the shape of illuminative light source is arbitrary and is determined based on illuminative light source and design. However, if an existing lighting element is used, it is desirable that the rod-shaped illuminativelight sources 542 with the same shape as strip lights are used. When the rod illuminativelight sources 542 are inserted into thefluorescent sockets 541, electric power is supplied to the rod illuminativelight sources 542, allowing lighting. In this case, a controller not shown in the drawing is provided in each of the rod illuminativelight sources 542. In addition, the light transmitting/receivingunits 522 should be provided surrounding the existing lighting elements and be electrically connected to the rod illuminativelight sources 542. As a result, the lighting elements, according to the present invention, may be provided using existing lighting elements. Use of existing lighting elements allows illuminative light communication at lower cost than that for replacement with new lighting elements. - Needless to say, the shape of the illuminative light source is not limited to the same rod shape as strip lights and may have a circular shape as with circular fluorescent lamps. Alternatively, an electric bulb-shaped illuminative light source is available, as described later.
-
FIGS. 4A and 4B each is an explanatory diagram of a first modified example of the illuminative light communication system, according to the second embodiment of the present invention. In the example shown inFIG. 2 , the lighting elements are provided on the ceiling. Alternatively, for example, thelighting elements 502 may be embedded in the ceiling as shown inFIGS. 4A andFIG. 4B . In such case, as shown inFIGS. 4A and 4B , for example, the light transmitting/receivingunits 522 are provided protruding from the ceiling, allowing optical communication among thelighting elements 502. -
FIG. 5 is an explanatory diagram of a second modified example of the illuminative light communication system, according to the second embodiment of the present invention. In the example shown inFIG. 5 , thelighting elements 502 are also embedded in the ceiling. When embedding thelighting elements 502 in the ceiling, there is space under the roof exceeding that needed for embedding thelighting elements 502. A structure that utilizes this space under the roof to provide the light transmitting/receivingunits 522 under the roof for communication among thelighting elements 502 and among thelighting elements 502 and theoptical communication device 501 is possible. -
FIG. 6 is an explanatory diagram of a third modified example of the illuminative light communication system, according to the second embodiment of the present invention. The example shown inFIG. 6 shows a case of using suspended shades as thelighting elements 502. In the case of suspended lamps, electric bulbs are often used as the light sources. According to the present invention, electric bulb-shaped illuminative light sources are used. In addition, the light transmitting/receivingunits 522 are provided at the upper part of underneath the shades of thelighting elements 502. Needless to say, the positions of the light transmitting/receivingunits 522 may be arbitrary as long as communication withother lighting elements 502 and with theoptical communication device 501 is possible. - For example, the suspended
lighting elements 502 are often provided over each customer's seat in a store. The structure shown inFIG. 6 is useful for such application. For example, when opening an internet cafe, broadband communication may be provided merely through optical communication among thelighting elements 502 and among thelighting elements 502 and theoptical communication device 501 without providing cables in the store. -
FIGS. 7 and 8 are explanatory diagrams of an illuminative light communication system, according to a third embodiment of the present invention.FIG. 9 is a diagram describing an exemplary illuminative light source, according to the third embodiment of the present invention. In the drawing, 551 denotes illuminative light sources, 552 denotes inter-adjacent light source light transmitting/receiving units, and 553 denotes inter-lighting element light transmitting/receiving units. In the aforementioned example shown inFIG. 3 , the light transmitting/receivingunits 522 must be provided in addition to the illuminative light sources even when using the existing lighting elements. The third embodiment shows an exemplary structure where the illuminative light sources and the light transmitting/receivingunits 522 are integrated. - In the example shown in
FIG. 9 , for example, the shape of the illuminativelight sources 551, according to the fifth embodiment of the present invention, is the same rod shape as strip lights as with the example shown inFIG. 3 . The illuminativelight sources 551 each comprises light emittingdevices 521,light reception devices 523, and a controller not shown in the drawing. In addition, the inter-adjacent light source light transmitting/receivingunits 552 are provided on the tube and are used for communication between adjacent illuminativelight sources 551 when the illuminativelight sources 551 are positioned so as to provide multiple fluorescent lamps in parallel. Note that assuming the case of providing three or more of illuminativelight sources 551, the inter-adjacent light source light transmitting/receivingunits 552 should be provided on both sides of the tube. - In addition, the inter-lighting element light transmitting/receiving
units 553 are provided for communicating with illuminativelight sources 551 other than the adjacent illuminativelight sources 551 and theoptical communication device 501. The inter-lighting element light transmitting/receivingunits 553 should be formed such that the length and orientation thereof are adjustable to accommodate various lighting elements. Note that inFIG. 9 , the inter-lighting element light transmitting/receivingunits 553 are provided at both ends; alternatively they may be provided at either end. - Such illuminative
light sources 551 are fixed replacing the existing fluorescent lamps of the lighting elements. In this case, the illuminativelight sources 551 should be attached directly to the sockets to which fluorescent lamps are inserted. As a result, electric power may be supplied to the illuminativelight sources 551 from the sockets of the lighting elements. Illuminative light data transmission is possible by regulating the length and orientation of the inter-lighting element light transmitting/receivingunits 553. - The example shown in
FIG. 7 shows an application to the first embodiment according to the present invention shown inFIG. 1 . In this case, the inter-lighting element light transmitting/receivingunits 553 attached to the respective illuminativelight sources 551 should face theoptical communication device 501. In this case, the inter-lighting element light transmitting/receivingunits 553 may be provided in a single illuminativelight source 551 of the respective lighting elements, and the inter-adjacent light source light transmitting/receivingunits 552 may be used for data communication for the other illuminative light sources. - The example shown in
FIG. 8 shows an application to the second embodiment according to the present invention shown inFIG. 234 . In this case, theoptical communication device 501 communicates with the inter-lighting element light transmitting/receivingunits 553 provided in a certain illuminativelight source 551 and communicates with the inter-adjacent light source light transmitting/receivingunits 552 or the inter-lighting element light transmitting/ receivingunits 553 for the other illuminativelight sources 551. When at least a single stroke communication route is prepared, illuminative light communication for all illuminativelight sources 551 is possible. Needless to say, multiple communication routes may be specified. - Note that
FIGS. 7 and 8 show a case of attaching the illuminativelight sources 551 to the lighting elements embedded in the ceiling. In such case, it is effective that the inter-lighting element light transmitting/receivingunits 553 are provided protruding downward as shown in the drawings. Similarly, according to the lighting elements to which the illuminativelight sources 551 are attached, surrounding shades extend below the illuminativelight sources 551. In such cases, it is also effective that the inter-lighting element light transmitting/receivingunits 553 are provided protruding downward. -
FIG. 10 is an explanatory diagram of an illuminative light communication system, according to a fourth embodiment of the present invention.FIG. 11 is a diagram describing an exemplary illuminative light source, according to the fourth embodiment of the present invention. In the fourth embodiment, the light transmitting/receivingunits 522 are not provided in the illuminativelight sources 551 or in thelighting elements 502, and thelight emitting devices 521 and thelight reception devices 523 are alternatively used. In this case, the illuminativelight sources 551, which comprise thelight emitting devices 521 and thelight reception devices 523 as shown inFIG. 11 , are used and attached to the existing lighting elements, thereby constituting the illuminative light communication system. As can be understood through comparison with the illuminativelight sources 551 shown inFIG. 9 , the inter-adjacent lighting source light transmitting/receivingunits 552 and the inter-lighting element light transmitting/receivingunits 553 are not provided in the exemplary illuminativelight sources 551 shown inFIG. 11 . - The
light reception devices 523 receive light (visible light or infrared light) emitted from the light transmitting/receivingunit 511 of theoptical communication device 501, thereby receiving data from theoptical communication device 501. Light emitted from thelight emitting devices 521 is modulated in accordance with the received data, and the resulting modulated illuminative light is emitted. Theterminal device 503 then receives and demodulates the modulated illuminative light, allowing theterminal device 503 to receive data. - On the other hand, in the case of transmitting data from the
terminal device 503, thelight reception devices 523 in the illuminativelight sources 551 receive and demodulate modulated light emitted from theterminal device 503, and then data from theterminal device 503 is transmitted to the illuminativelight sources 551. Light emitted from thelight emitting devices 521 is modulated in accordance with the received data, and the resulting modulated illuminative light is emitted. If the light transmitting/receivingunit 511 of theoptical communication device 501 receives and demodulates the modulated illuminative light, data is transmitted from theterminal device 503 to theoptical communication device 501. - In this manner, in the fourth embodiment, both the
optical communication device 501 and theterminal device 503 emit light to the illuminativelight sources 551, and receive illuminative light emitted from the illuminativelight sources 551. This allows use of illuminative light having large electric power and reduction in influences of shadowing since the lighting elements are provided in the ceiling where shadows are difficult to generate, thereby providing favorable communication rather than the case of direct optical communication between theoptical communication device 501 and theterminal device 503. Needless to say, it is unnecessary to extend a communication cable or an optical cable to thelighting elements 502. - Note that in the example shown in
FIG. 10 , dedicated illuminativelight sources 551 as shown inFIG. 11 are used. Similarly, the light transmitting/receivingunits 522 may not be provided in thelighting elements 502 in the case of using dedicated lighting elements as shown inFIG. 1 . -
FIG. 12 is an explanatory diagram of an illuminative light communication system, according to a fifth embodiment of the present invention. In the drawing, 561 denotes street lights. Currently, a mercury lamp, a sodium lamp, or a fluorescent lamp is mainly used as thestreet lights 561 on a road. Alternatively, a semiconductor light emitting device such as an LED may be applied. When a semiconductor light emitting device is used as the illuminative light source of thestreet lights 561, various pieces of data may be transmitted through illuminative light to moving vehicles and pedestrians. In this case, it is costly to provide a communication cable or an optical cable to transmit data to therespective street lights 561. - According to the present invention, the light transmitting/receiving
units 522 are provided in thestreet lights 561, and optical data communication among thestreet lights 561 is provided through the air as with the aforementioned second embodiment. This allows data transmission to therespective street lights 561 and illuminative light data transmission by thestreet lights 561. Such structure is economical since only electrical work for therespective street lights 561 is necessary without providing a communication cable or an optical fiber. - Note that the intervals between the
street lights 561, for example, of approximately 30 m on an expressway are longer than in the aforementioned case of indoors. However, optical communication is sufficiently possible. In addition, due to the present topology or structure of the road, the orientation of the light transmitting/receivingunits 522 must be regulated so as for those units to face adjacent street lights. This is not very difficult as long as they have typical intervals between adjacent street lights. Furthermore, a problem that the field of vision may be obstructed by mist is expected. However, this is not a significant problem since the intervals are approximately 30 m. - An example of optical communication among the street lights provided on the road is shown as an outdoor network herein, and an application according to the present invention is not limited to this. For example, it is applicable to taxiway lights for air crafts or illumination lamps in event halls.
- Several embodiments and modified examples according to the present invention have been described above. In the aforementioned description, data is transmitted from the
optical communication device 501 to thelighting elements 502, the illuminativelight sources 551, or the street lights 561 (referred to as lighting elements and the like). It is unnecessary for the respective lighting elements and the like to transmit received data as is through illuminative light. For example, a structure such that an address or an ID is attached to a header of data to be transmitted and that the lighting elements and the like select data in accordance with that header and transmit the selected data via illuminative light is possible. In addition, the lighting elements and the like, which function as a relay or a router and are not used for illuminative light data communication, may be provided. - As described above, according to the present invention, when each of lighting elements and illuminative light sources are used for optical communication, data is transmitted thereto through the air. Therefore, electrical work for providing a communication cable or an optical fiber is unnecessary, allowing constituting an illuminative light communication system at low cost. In this case, the system may be structured using existing lighting elements, allowing further reduction in cost. In addition, different from power line communication, optical communication prevents problems such as constraints on bandwidth, radio wave radiation, and superimposition of noise from developing, allowing high-quality data communication.
Claims (21)
1. An illuminative light communication system, comprising:
a plurality of lighting units that emits light for lighting; and
an optical communication unit that optically transmits data through the air to the lighting units; wherein the lighting units receive light from the optical communication unit, thereby capturing data, and modulate emitted light in accordance with the data.
2. An illuminative light communication system, comprising:
a plurality of lighting units that emits light for lighting; and
an optical communication unit that optically transmits data through the air to one or more of the lighting units; wherein the one or more of the lighting units receive light from the optical communication unit, thereby capturing data, and optically transmit the data through the air to another lighting unit; and each lighting unit modulates emitted light in accordance with the data received from the optical communication unit or another lighting unit and transmits the data via the modulated, emitted light.
3. The illuminative light communication system according to either claim 1 or claim 2 , wherein the plurality of lighting units is an indoor illumination lamp.
4. The illuminative light communication system according to claim 2 , wherein the plurality of lighting units is a street lamp.
5. The illuminative light communication system according to either claim 1 or claim 2 , wherein the plurality of lighting units allows optical bidirectional communication through the air with the optical communication unit or another lighting unit.
6. The illuminative light communication system according to claim 5 , wherein the plurality of lighting units comprises a light receiving unit that receives light modulated in accordance with data emitted from a terminal device, which receives emitted light and thereby receives data, and allows optical bidirectional communication between the terminal device and the plurality of lighting units.
7. The illuminative light communication system according to either claim 1 or claim 2 , wherein the plurality of lighting units uses a semiconductor light emitting device as an illuminative light source.
8. A lighting device, comprising:
one or a plurality of illuminative light emitting units that emits light for lighting;
an optical transmitting and receiving unit for optically communicating through the air with a light emitting unit provided in a device; and
a control unit that controls the illuminative light emitting unit in accordance with data received by the light transmitting and receiving unit, so as to modulate light emitted from the illuminative light emitting unit in accordance with the data, thereby transmitting the data.
9. The lighting device according to claim 8 , wherein the optical transmitting and receiving unit is deployed in a plurality of positions in different communication directions; and the control unit controls so that data received by a certain light transmitting and receiving unit can be optically transmitted through the air from another light transmitting and receiving unit to the device.
10. The lighting device according to claim 8 , wherein the illuminative light emitting unit lights indoors.
11. The lighting device according to claim 8 , wherein the illuminative light emitting unit lights the road.
12. The lighting device according to claim 8 , wherein the optical transmitting and receiving unit allows bidirectional optical communication through the air with the device.
13. The lighting device according to claim 12 , further comprising a light receiving unit that receives light modulated in accordance with data emitted from a terminal device, which receives light emitted from the light emitting unit, thereby receiving data; wherein bidirectional communication with the terminal device is carried out via light.
14. The lighting device according to claim 8 , wherein the illuminative light emitting unit comprises one or a plurality of semiconductor light emitting devices as an illuminative light source.
15. An illuminative light source, comprising:
one or a plurality of illuminative light emitting devices that emits light for lighting;
an optical transmitting and receiving unit for optically communicating through the air with a light emitting unit provided in another lighting unit; and
a control unit that controls the illuminative light emitting device in accordance with data received by the optical transmitting and receiving unit, so as to modulate light emitted by the illuminative light emitting device in accordance with the data, thereby transmitting the data.
16. The illuminative light source according to claim 15 , wherein the optical transmitting and receiving unit is deployed in a plurality of positions in different communication directions; and the control unit controls so that data received by a certain light transmitting and receiving unit can be optically transmitted through the air from another light transmitting and receiving unit to the another device.
17. The illuminative light source according to claim 15 , wherein the optical transmitting and receiving unit is structured to be capable of changing an optical transmission and a reception direction.
18. The illuminative light source according to claim 15 , wherein the optical transmitting and receiving unit is deployed in plural; one is used, in the case of the plurality of illuminative light emitting devices being arranged, to allow optical communication through the air with an adjacent illuminative light source, while the other is used to allow optical communication through the air with another illuminative light source provided in another lighting unit.
19. The illuminative light source according to claim 15 , wherein the optical transmitting and receiving unit carries out bidirectional optical communication through the air with the another lighting unit.
20. The illuminative light source according to claim 19 , further comprising a light receiving unit that receives light modulated in accordance with data emitted from a terminal device, which receives light emitted from the light emitting unit, thereby receiving data; wherein bidirectional optical communication is carried out through the air with the terminal device.
21. The illuminative light source according to claim 15 , wherein the illuminative light emitting device is one or a plurality of semiconductor light emitting devices.
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Also Published As
Publication number | Publication date |
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EP1858179A1 (en) | 2007-11-21 |
EP1564914A4 (en) | 2006-01-25 |
KR20050071617A (en) | 2005-07-07 |
US7583901B2 (en) | 2009-09-01 |
US7929867B2 (en) | 2011-04-19 |
EP1855398B1 (en) | 2010-02-10 |
DE60316178T2 (en) | 2008-06-05 |
KR100970034B1 (en) | 2010-07-16 |
CN101714898A (en) | 2010-05-26 |
US20090297167A1 (en) | 2009-12-03 |
EP1865631A1 (en) | 2007-12-12 |
AU2003275606A1 (en) | 2004-05-13 |
HK1129164A1 (en) | 2009-11-20 |
US20090310976A1 (en) | 2009-12-17 |
HK1087848A1 (en) | 2006-10-20 |
EP1855398A1 (en) | 2007-11-14 |
EP1564914A1 (en) | 2005-08-17 |
DE60336770D1 (en) | 2011-05-26 |
EP1860801A1 (en) | 2007-11-28 |
ATE372614T1 (en) | 2007-09-15 |
DE60316178D1 (en) | 2007-10-18 |
EP1865631B1 (en) | 2011-04-13 |
US20090297166A1 (en) | 2009-12-03 |
US20060056855A1 (en) | 2006-03-16 |
DE60331271D1 (en) | 2010-03-25 |
EP1860800A1 (en) | 2007-11-28 |
WO2004038962A1 (en) | 2004-05-06 |
EP1860799A1 (en) | 2007-11-28 |
EP1863203A1 (en) | 2007-12-05 |
EP1564914B1 (en) | 2007-09-05 |
US20090297157A1 (en) | 2009-12-03 |
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