WO2006033263A1 - 光送信装置及び光通信システム - Google Patents
光送信装置及び光通信システム Download PDFInfo
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- WO2006033263A1 WO2006033263A1 PCT/JP2005/016812 JP2005016812W WO2006033263A1 WO 2006033263 A1 WO2006033263 A1 WO 2006033263A1 JP 2005016812 W JP2005016812 W JP 2005016812W WO 2006033263 A1 WO2006033263 A1 WO 2006033263A1
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- light
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- emitting element
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/1143—Bidirectional transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- 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
Definitions
- the present invention relates to an optical transmission device and an optical communication system, and more particularly to a technique for performing optical communication using visible light and using the light as illumination light.
- visible light communication uses visible light elements such as LEDs (Light Emitting Diodes) with variable colors as the light source, thus eliminating the problems of infrared communication and using the characteristics that the visible light elements blink at high speed.
- LEDs Light Emitting Diodes
- Such a visible light element is also used as illumination light not only for optical communication.
- each LED is loaded with individual data for multi-color communication.
- the amount of light used for communication of the visible light element is required to sufficiently satisfy the amount of light as illumination light.
- the on / off position is inverted by a pulse signal sequence that emits light (on) in the noise region and does not emit light in the flat region (off). Based on the inverted pulse position modulation, the LED emits light, thereby extending the on-time of the pulse and improving the light intensity of the illumination for communication.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-290335
- Patent Document 2 JP 2004-72365 A
- Non-Patent Document 1 "What is Visible Light Communication?” [Online], Visible Light Communication Consortium, [Searched September 7, 2004], Internet ⁇ http://www.vlcc.net/about.html> Disclosure of the invention
- An object of the present invention is to provide an optical transmission device and an optical communication system that can irradiate with an equal amount of illumination light without causing flickering of illumination when performing optical communication.
- the gist of the present invention for solving the above problems is the following (1) to (16).
- An electric signal generation unit that converts a predetermined input signal to generate an electric signal, a light source in which a plurality of light emitting elements are arranged, a light source that converts the electric signal into an optical signal and blinks the light emitting element to emit light
- a light source control unit that irradiates visible light by light emission of the light emitting element and performs optical communication by blinking of the light emitting element, wherein the light source includes the issuing element as a constituent unit.
- the light-emitting element group is arranged, and the light source control unit controls the light-emitting element in accordance with a light amount of the issuing element group.
- the light source control unit selects a color combination element group in which the light emitting element forms a specific visible light color by color synthesis and forms one optical communication path, and selects the color combination element group. It emits light.
- the color combination element group includes the two-color light-emitting elements that emit white light by complementary colors, or the three-color light-emitting elements that generate white light by three primary colors.
- the color combination element group is repeatedly arranged over the irradiation surface of the light source, with the same number of input signals as one set.
- the light source control unit is used for optical communication, and the color combination element group that is used for light communication does not emit light. If not, the color combination element group that is not used for optical communication is caused to emit light so that the amount of light of the entire light source becomes substantially equal.
- the light source control unit is used for optical communication! /,!,
- the light amount of the entire light source is approximately equal. It is characterized by emitting light as follows.
- the light source is characterized in that the light-emitting elements are arranged with a light-emitting element group forming a specific visible light color by color synthesis and forming one optical communication path as a constituent unit.
- the light-emitting element group includes a first light-emitting element array that blinks during optical communication and a second light-emitting element array that emits light corresponding to the insufficient light amount when the first light-emitting element array does not emit light. It is characterized by.
- the light emitting element group is characterized by being repeatedly arranged over the irradiation surface of the light source, with the same number of the input signals as one set.
- the dimming element group is characterized in that the light intensity is configured to be variable according to the light amount sum of the communication element group q (i).
- the light source is characterized in that the communication element group q (i) is made of an LED, and the dimming element group is a fluorescent lamp.
- the electrical signal generation unit adds a DC component having a constant amplitude to the communication signal S (i) to generate an amplified communication signal, and adds the DC component to the dimming signal.
- An amplified dimming signal is generated, and the light source control unit causes the communication element group s (i) to emit light based on the amplified communication signal, and causes the dimming element group c to emit light based on the amplified dimming signal. It is characterized by that.
- An optical communication system comprising: the optical transmission device according to any one of claims 5 to 15; and an optical reception device that receives the optical signal and extracts the input signal.
- the optical receiving device is characterized in that, for an optical signal emitted from the light emitting element that is not used for optical communication, the input signal is not extracted from the optical signal based on an eigenvalue of the optical signal.
- the light emitting element selects a color combination element group that forms a specific visible light color by color synthesis and forms one optical communication path.
- the color combination element groups By causing the color combination element groups to emit light synchronously, it is possible to always maintain light of a specific color and prevent flickering of illumination light.
- the light emitting element used for optical communication does not emit light
- the light emitting element not used for optical communication emits light, and the light quantity of the entire light source is made equal, regardless of the content of the input signal. Since a uniform amount of light can be maintained throughout the light source, lighting flicker can be prevented.
- FIG. 1 is a diagram showing a schematic configuration of an optical communication system according to a first embodiment.
- FIG. 2 is a diagram showing a first arrangement pattern of LEDs of the light source of the first embodiment.
- FIG. 3 is a flowchart showing a processing flow of the optical communication system according to the first embodiment.
- FIG. 5 (a) is a pulse diagram showing a communication signal of the first embodiment, and (b) is an inverted signal of the first embodiment.
- FIG. 4C is a diagram showing the light amount of the entire light source of the first embodiment.
- ⁇ ⁇ 6] is a diagram showing a second arrangement pattern of LEDs of the light source of the second embodiment.
- FIG. 7 (a) is a diagram showing the light amount sum of the light emitting element group of the second embodiment, (b) is a diagram showing the light amount of the light control element group of the second embodiment, and (c) is the second embodiment.
- FIG. 1 is a diagram illustrating a schematic configuration of an optical communication system according to the present embodiment (first embodiment), and FIG. 2 is a diagram illustrating a first arrangement pattern of LEDs of a light source according to the present embodiment.
- Fig. 5 (a) is a pulse diagram showing the communication signal of this embodiment (vertical axis; on-off, horizontal axis; time), and Fig. 5 (b) is a pulse diagram showing the inverted signal of this embodiment (vertical axis; ON / OFF, horizontal axis; time), Fig. 5 (c) is a diagram showing the light amount of the entire light source of this embodiment (vertical axis; light amount, horizontal axis; time, dot portion; communication signal, blackened portion; inverted signal) It is.
- an optical communication system 1 includes an optical transmission device 10 and an optical reception device 20, such as a PC (Personal Computer) or a PDA (Personal Data Assistant). Modulate input signals such as text, sound, and images input from the transmitting device between information devices such as PCs and peripheral devices such as PCs and printers to generate visible light as a carrier wave. The above input signal, which emits light and also receives the received light power, is output to the transmitting device.
- an optical transmission device 10 and an optical reception device 20, such as a PC (Personal Computer) or a PDA (Personal Data Assistant). Modulate input signals such as text, sound, and images input from the transmitting device between information devices such as PCs and peripheral devices such as PCs and printers to generate visible light as a carrier wave.
- the above input signal which emits light and also receives the received light power, is output to the transmitting device.
- optical communication system 1 that performs optical communication between the transmission-side PC 2 and the reception-side PC 3 will be given.
- the optical transmission device 10 and the optical device in the optical communication system 1 will be described.
- a specific configuration of the receiving device 20 will be described.
- the optical transmission device 10 includes an optical transmission main body 11 connected to the transmission side PC 2 and a light source device (light source) 18 connected to the optical transmission main body 11.
- the optical transmission main body 11 inputs an input signal P input from the transmission side PC 2.
- (i) [i; Number of signals] is converted into an electric signal, and the light source 18 emits an optical signal based on the electric signal and irradiates it as illumination.
- the optical transmission main body 11 includes a data input unit 12, a transmission control unit 13, and a data output unit 17.
- the data input unit 12 binarizes an analog or digital input signal P (i). At this time, whether the input signal P (i) is a multiplexed signal or a plurality of single signals, It is configured to demultiplex with the number of signals i.
- the transmission control unit 13 includes components such as an electric signal generation unit 14, a light source control unit 15, a storage unit 16, and a CPU (not shown).
- the CPU includes the electric signal generation unit 14 and the light source control unit 15 It is constructed as a device that realizes a function for converting the input signal P (i) into an electrical signal and causing the light source device 18 to emit light based on the electrical signal by executing the program based on a program instruction. .
- This program has a communication signal generation function, an inverted symbol generation function, and a light emitting element selection function.
- the electrical signal generation unit 14 realizes the communication signal generation function and the inverted symbol generation function, and the light source control unit 15 It may be configured to realize a light emitting element selection function.
- the electrical signal generation unit 14 converts the input signal P (i) into a communication signal S (i, t) [t; number of bits, time] indicating blinking (on / off) of the LED 19 as an electrical signal.
- Inverted signal R (i, t) is generated.
- the communication signal S (i, t) is an 8-bit pulse signal sequence, and "1" is (Lit), “0” indicates off (dark).
- the inverted signal R (i, t) is a pulse signal sequence obtained by inverting “1” and “0” of the communication signal S (i, t).
- the light source control unit 15 selects a first light emitting element array (color combination element group) in which an LED (light emitting element) 19 forms a specific visible light color by color synthesis and forms one optical communication path.
- a first light emitting element array color combination element group
- an LED (light emitting element) 19 forms a specific visible light color by color synthesis and forms one optical communication path.
- the second light emitting element row color combination element group
- the light emitting element array emits light.
- the light source unit 18 converts the input communication signal S and inverted signal R (electric signal) into an optical signal to emit light.
- a plurality of LEDs 19 are arranged on the irradiation surface of the light source 18. Each LED 19 emits visible light having a unique spectrum, and is arranged according to the first arrangement pattern described below.
- the first array pattern is a pattern in which LEDs 19 used for optical communication and LEDs 19 not used for optical communication are evenly arranged.
- White light visible light color
- LEDs 19 Complementary color relationships (a, b) that form
- the two LEDs 19 in the complementary color relationship (a, b) form one optical communication path by blinking in synchronization with the electrical signal.
- Such a first arrangement pattern includes two sets of complementary colors (a, b) of LEDs 19, a first light-emitting element array (a (k), b (k)), and dimming for optical communication, respectively.
- Second light-emitting element array (a (k + 1), b (k + 1)), and a light-emitting element group (p (i); (a (k), b (k)), (a (k + 1), b (k + l)), [k 2 X i— 1] ⁇ form an i-sided polygon.
- the number i of light emitting element groups p (i) is the same as this corresponding to the number i of signals of the input signal P (i).
- the number i of signals is 4. is there.
- one structural unit of the light emitting element group p (i) is four LEDs 19 arranged in a square cell.
- the light emitting element groups p (l) to p (4) are repeatedly arranged as a set over the entire irradiation surface of the light source 18.
- the first light emitting element array (a (k), b (k)) is two LEDs 19 blinking in optical communication, and is on one diagonal line of the square cell.
- the second light emitting element row (a (k + 1), b (k + 1)) is the two LEDs 19 that emit light corresponding to the insufficient light quantity when the first light emitting element row does not emit light. On the other diagonal of the cell.
- the light emitting element group p (3) corresponds to the third input signal P (3), and includes a first light emitting element array (a (3), b (3)) and a second light emitting element array (a ( 4), b (4)).
- a light shielding wall 18a is formed around the light emitting element group p (3) at the boundary portion between the light emitting element and the light shielding wall 18a.
- the light shielding wall 18a prevents the internal light of the light emitting element group p (3) from leaking and prevents external light from being inserted, and has a function of improving the color mixing accuracy of the light emitting element group p (3).
- the light source control unit 15 selects the first light emitting element array (a (k), b (k)) from the storage unit 16 based on the communication signal S (i, t) generated by the electrical signal generation unit 14. Then, the selected first light emitting element array (a (k), b (k)) is caused to emit light, and from the storage unit 16 based on the inverted signal R (i, t) generated by the electric signal generation unit 14.
- the second light emitting element row (a (k + l), b (k + l)) is selected, and the selected second light emitting element row (a (k + 1), b (k + 1)) is made to emit light. ! /
- the data output unit 17 shapes the waveform of the output value (communication signal and inverted signal) from the light source control unit 15 and outputs it to the light source unit 18.
- the optical receiver 20 is composed of a light receiver 21 disposed opposite to the light source device 18 at a predetermined distance, and a receiver main body 23 connected thereto. With respect to the received optical signal, the receiving device main body 23 extracts the input signal P (i), and transmits this input signal P (i) to the receiving-side PC 3 connected to the receiving device main body 23.
- the light receiver 21 receives a multiplexed optical signal in which the communication signal S (i, t) and the inverted signal R (i, t) are combined, and converts the multiplexed optical signal into an electrical signal.
- the light receiving surface of the light receiver 21 has a light receiving element 22 such as a CCD or CMOS. Arranged in the same pattern as the array pattern.
- the receiving device body 23 includes a data input unit 24, a filter 25, a light reception control unit 26, and a data output unit 27.
- the data input unit 24 binarizes the electrical signal from the light receiver 21.
- the filter 25 allows an electrical signal having a specific frequency to pass therethrough and blocks other electrical signals.
- This “specific frequency” corresponds to the spectrum of light emitted from the LED 19 for optical communication.
- the light reception control unit 26 passes the combined portion of the communication signal S (i,) through the filter 25 and demultiplexes it with the signal number i, and the inverted signal R ( The combined part of i, t) is blocked by the filter 25.
- the data output unit 27 shapes the waveform of the output value from the light reception control unit 26 according to a command from the light reception control unit 26, generates the input signal P (i), and outputs it to the light receiving side PC3. ing.
- FIG. 3 is a flowchart showing a processing flow of the optical communication system of the present embodiment.
- FIG. 4 and FIG. 4 and other FIG. 1 and the like processing and operation of the optical communication system 1 of the present embodiment will be described.
- the processing from S 1 to S 5 is performed by the optical transmission device 10
- the processing of S 6 and S 7 is performed by the optical reception device 20.
- the data input unit 12 is, for Input signal 1 3 from the transmission side 1 ⁇ 2 (1) to 1 3 (4), the above-described processing.
- the electrical signal generator 14 is an input signal? ) ⁇ ! ⁇ generates communication signals S (1, t) ⁇ S (4, t) based on (see Fig. 5 (a)).
- This “t” indicates the number of bits of the pulse signal sequence, and indicates the unit time when the communication signal S (i, t) changes with time.
- the communication signal S (l, 3) represents the “1 (on)” signal stored in the third bit in the pulse signal sequence corresponding to the input signal P (l).
- (On) signal for unit time It means output after 3 (eg 3 seconds).
- the electrical signal generator 14 inverts the “1 (on)” signal and the “0 (off)” signal in response to the communication signals S (1, t) to S (4, t). Inverted signals R (l, t) to R (4, t) are generated (see Fig. 5 (b)).
- t has the same meaning as “t” in the communication signals S (l, t) to S (4, t).
- the communication signal (1) 1, 0, 1, 1, 0, 1, 0, 1 ⁇
- the inverted signal ⁇ R (l, t); 0, 1, 0, 0, 1, 0, 1, 0 ⁇ see Fig. 5 (a) and (b)).
- the light source control unit 15 corresponds to the input signals P (1) to P (4) based on the contents stored in the storage unit 16, and the light emitting element groups p (1) to p ( 4)
- the first light emitting element row (a (k), b (k)) and the second light emitting element row (a (k + 1), b (k + 1)) (k 2 X i — Select 1 (see Figure 2).
- the light emitting element group p (2) corresponds to the input signal P (2), and the first light emitting element array (a (3), b (3)) and the second light emitting element array (a (4) B (4)).
- the light source controller 15 outputs the communication signals S (l, t) to S (4, t) and the inverted signals R (l, t) to R (4, t), and the communication signal S Based on (l, t) to S (4, t), the first light emitting element array (a (k), b (k)) is caused to emit light, and the inverted signals R (l, t) to S (4, t ), The second light emitting element array (a (k + l), b (k + l)) is caused to emit light.
- communication signals S (l, 2) and S (3, 2) are “0 (off)” signals
- the signals S (2, 2) and S (4, 2) are ⁇ 1 (ON) '' signals
- the first light emitting element rows (a (1), b (1)) and (a (5), b (5)) goes off
- the first light emitting element row (a (3), b (3)) and (a (7), b (7)) turn on (see Fig. 4 (b)) .
- the inverted signals R (l, 2) and S (3, 2) are “1 (ON)” signals
- the inverted signal R ( 2, 2) and S (4, 2) are “0 (off)” signals
- the second light emitting element array (a (2), b (2)) and (a (6), b (6 )) Is lit
- the second light emitting element rows (a (4), b (4)) and (a (8), b (8)) are turned off (see Fig. 4 (b)).
- the first light emitting element row (a (k), b (k)) or the second light emitting element row (a (k + l), b (k + l)) ) When one of them is lit, the other is not lit, so the light intensity balance is kept even regardless of the data content (ON / OFF) of the communication signal S (i, t). As a result, the entire light amount of the light source device 18 is kept uniform (see FIG. 5 (c)).
- the light receiver 21 transmits communication signals S (l, t) to (4, t) and inverted signals R (l, t) to
- a multiplexed optical signal in which (4, t) is combined is received.
- This multiplexed optical signal is composed of each light amount of communication signals S (1, t) to (4, t) and each light amount of inverted signals R (l, t) to (4, t) per unit time. This includes the amount of light required for optical communication (communication signal combining part, the dot part in Fig. 5 (c)) and the amount of light unnecessary for optical communication (inverted signal combining part).
- the light reception control unit 26 causes the combined portion of the communication signals S (1, t) to (4, t) to pass through the filter 25, and the inverted signal R (l, The combined portion of t) to (4, t) is blocked by the filter 25.
- the “spectrum of received light” here means the light spectrum (eigenvalue) emitted by each LED 19 in the first light emitting element array (a (k), b (k)), and the second light emitting element array (a (k + It corresponds to the light spectrum (specific value) emitted by each LED19 for 1) and b (k + 1)).
- a complementary color relationship (a, b) that forms white light by combination is obtained according to the arrangement of the LED 19, and one optical communication is performed. Since the combination of the LEDs 19 forming the path is used as the light emitting element group p (i) as a structural unit, the light emitting element group p (i) emits light synchronously as an optical signal for communication or an optical signal for dimming. By doing so, the light emitting element group p (i) can be kept as one unit, and white light can always be maintained to prevent flickering of illumination light.
- the first light emitting element array (a (k), b (k)) used for optical communication does not emit light, it is used for optical communication. Because the second light emitting element array (a (k + 1), b (k + 1)) emits light so that the entire light source 18 has a uniform amount of light, the light source Since the entire device 18 can emit a uniform amount of light, flickering of the lighting can be prevented.
- the light emitting element group p (i) is a first light emitting element array (a (k), b (k)) that blinks during optical communication, Since this is composed of the second light emitting element array (a (k + 1), b (k + 1)) that emits only the insufficient amount of light when it does not emit light, the light emitting element group p (i ) Can always have a constant light intensity.
- the first light emitting element array (a (k), b (k)) is generated by the electronic signal generation unit 14 and the light source control unit 15 based on the communication signal S (i).
- the second light emitting element array (a (k + l), b (k + l)) based on the inversion signal R (i) the above-described effects can be realized.
- the optical receiver 20 from the first light emitting element array (a (k), b (k)) used for optical communication based on the spectrum of the received light.
- the input signal P (i) is extracted only from the emitted optical signal, and the optical signal emitted from the second light emitting element array (a (k + l), b (k + l)) not used for optical communication is cut.
- the communication signal can be accurately received from the optical transmission device 10 for the communication signal transmitted together with the dimming signal.
- FIG. 6 is a diagram showing an array of LEDs of the light source of the present embodiment (second embodiment).
- Fig. 7 (a) is a diagram showing the light amount sum of the light emitting element group of this embodiment
- Fig. 7 (b) is a diagram showing the light amount of the light control element group of this embodiment
- Fig. 7 (c) is It is a figure which shows the light quantity of the light source of this embodiment.
- the LEDs 19 are mainly arranged on the illumination surface of the light source device 18 according to the second arrangement pattern, and electrical signal generation corresponding to this is performed.
- the control of the unit 14 and the light source control unit 15 is different.
- such differences will be described, and the other components will be denoted by the same reference numerals as those in the first embodiment and description thereof will be omitted.
- the light emitting element group (color yarn and matching element group) p (i) in the second arrangement pattern of the LED 19 blinks in response to the input signal P (i) during optical communication.
- Such a second arrangement pattern is formed in a “cross-shaped” shape in which the dimming element group c is arranged at the center and the communication element groups q (1) to q (4) are arranged around the dimming element group c. !
- the LED 19 of (a (k), b (k)) and (a (k + 1), b (k + 1)) blinks in synchronism with the electrical signal.
- two sets of light emitting element groups (A (l), B (l)) and (A (2), B (2)) satisfy a complementary color relationship in a square cell. It is arranged. 1 ⁇ : 019 in (A (l), B (l)) and (A (2), (2)) are all flashing in response to the flashing of communication element group p (i).
- the light intensity is configured to be variable in accordance with the light amount sum of the communication element group p (i).
- the communication signal S (i) is the same as that in the first embodiment (see FIG. 5 (a)).
- the dimming signal C is a pulse signal indicating the light intensity for the shortage of the light amount sum of the communication signal S (i) (the shaded area in Fig. It is a column (see Fig. 7 (b)).
- the light source controller 15 emits the communication element group q (i) based on the communication signal S (i), and causes the dimming element group c to emit light based on the dimming signal C. ! /
- the processing of the optical communication system of the present embodiment is different from the processing of S3 to S5 in the flowchart shown in FIG.
- the electrical signal generation unit 14 adds these "1 (on)" signals bit by bit in accordance with the light amount sum of the communication signals S (1, t) to S (4, t). Dimming signal C (t) is generated.
- communication signals ⁇ S (l, 2); 0 ⁇ , ⁇ S (2 2); 1 ⁇ , ⁇ S (3,2); 0 ⁇ , ⁇ S (4,2), 1 ⁇ are dimming signals ⁇ C (2); 2 ⁇ .
- one unit of the light intensity of the dimming signal corresponds to the total amount of light of the communication element group s (i), and when the dimming signal C (2) is ⁇ 2 '', the light intensity of the dimming element group c Is twice the communication element group s (i).
- the light source controller 15 receives an input signal? ) ⁇ ! ⁇ corresponding to the communication element group q (l) ⁇ q (4).
- the communication element group q (2) corresponds to the input signal P (2), and two 1 ⁇ : 019 (a (3), 1) (3)) and (a (4), b It consists of the two LEDs 19 in (4)).
- the light source control unit 15 outputs the communication signal S (i, t) and the dimming signal C (t), and based on the communication signal S (i, t), the communication element group q (i) is caused to emit light, and based on the dimming signal C (t), the dimming element group c is caused to emit light with the corresponding light intensity.
- the dimming signal C (l) is “0”, and the dimming element group c is off.
- the light emitting element group p (i) and the communication element group q (i) blinking at the time of optical communication are not emitted.
- the light control device group c that emits light corresponding to the insufficient light amount can always be set to a constant light amount in the light emitting element group p (i) during optical communication.
- the electronic signal generation unit 14 and the light source control unit 15 cause the communication element group q (i) to emit light based on the communication signal S (i), and the dimming signal C is generated. Based on this, the above-described effects can be realized by causing the light control element group c to emit light.
- the present invention can be variously modified without being limited to the first and second embodiments.
- the light emitting element is arranged as a constituent unit of a light emitting element group that forms a specific visible light color by color synthesis and forms one optical communication path.
- the white light is irradiated with a combination of light emitting elements of two colors having a complementary color relationship, one optical communication path may be formed, but the light emission of each of R, G, and B of the three primary colors
- the element may be used to irradiate white light and form one optical communication path.
- the irradiating light is not limited to white and may be any color that can be used as illumination light.
- the first light emitting element array for optical communication and the second light emitting element array for dimming are equally arranged, and any one of these is selected.
- the light amount of the entire light source device is always turned on in a uniform region and light amount regardless of the content of the communication signal (same as the input signal).
- the communication element group for optical communication By adjusting the light intensity with the dimming element group for dimming, the light amount of the entire light source is always lit with the same amount of light regardless of the content of the communication signal.
- the present invention is not limited to these, and combines the alternative selection of the light emitting element group for communication and the light emitting element group for dimming and the adjustment of the light intensity of the light emitting element group for dimming. Then, select the light-emitting element group for dimming so that the light quantity of the entire light source device is equalized according to the flashing of the light-emitting element group for communication, which can be made uniform. You can make it emit light.
- the power dimming element group in which both the communication element group and the dimming element group have the Led force may be a fluorescent lamp.
- the fluorescent lamp has a wider light intensity range than the LED, it is more advantageous than the case where the light control element group is an LED.
- the electrical signal generation unit 14 adds a DC component having a constant amplitude to the communication signal S (i) to generate an amplified communication signal
- This direct current component is added to the dimming signal C to generate an amplified dimming signal
- the light source controller 15 causes the communication element group s (i) to emit light based on the amplified communication signal, and based on the amplified dimming signal.
- the dimmer element group c may emit light.
- FIG. 7D is a diagram showing the light amount of the light source in such a modification.
- the light source 18 adds a direct current component (shaded area in Fig. 7 (d)) to the constant light amount sum of the communication element group q (i) and the dimming element group c. There is an advantage that it becomes brighter by that much.
- the light emitting element selects a color combination element group that forms a specific visible light color by color synthesis and forms one optical communication path, By causing the color combination element groups to emit light synchronously, it is possible to always maintain light of a specific color and prevent flickering of illumination light.
- the light emitting element used for optical communication does not emit light
- the light emitting element not used for optical communication emits light
- the light quantity of the entire light source is made equal, regardless of the content of the input signal. Since a uniform amount of light can be maintained in the entire light source, flickering of the lighting can be prevented, and industrial applicability is extremely high.
- the present invention is not limited to the embodiment described above.
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CN200580031492XA CN101023607B (zh) | 2004-09-22 | 2005-09-13 | 光发送设备和光通信系统 |
US11/575,744 US8254791B2 (en) | 2004-09-22 | 2005-09-13 | Optical transmitting apparatus and optical communication system |
US13/524,944 US8750721B2 (en) | 2004-09-22 | 2012-06-15 | Optical transmitting apparatus and optical communication system |
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JP2004275706A JP5084096B2 (ja) | 2004-09-22 | 2004-09-22 | 光送信装置及び光通信システム |
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US13/524,944 Continuation US8750721B2 (en) | 2004-09-22 | 2012-06-15 | Optical transmitting apparatus and optical communication system |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002290335A (ja) * | 2001-03-28 | 2002-10-04 | Sony Corp | 光空間伝送装置 |
JP2004297425A (ja) * | 2003-03-27 | 2004-10-21 | Toshiba Corp | ワイヤレス光通信システム |
JP2005216780A (ja) * | 2004-01-30 | 2005-08-11 | Matsushita Electric Works Ltd | 照明装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6271815B1 (en) * | 1998-02-20 | 2001-08-07 | University Of Hong Kong | Handy information display system |
JP2001292107A (ja) * | 2000-04-06 | 2001-10-19 | Sony Corp | 受信装置、送信装置、および通信システム |
JP2003115803A (ja) * | 2001-10-09 | 2003-04-18 | Nec Corp | 発光装置及び通信システム |
JP4207490B2 (ja) | 2002-08-06 | 2009-01-14 | ソニー株式会社 | 光通信装置、光通信データ出力方法、および光通信データ解析方法、並びにコンピュータ・プログラム |
JP4089370B2 (ja) | 2002-09-24 | 2008-05-28 | 東芝ライテック株式会社 | 照明装置及び照明システム |
EP1564914B1 (en) * | 2002-10-24 | 2007-09-05 | Nakagawa Laboratories, Inc. | Illumination light communication device |
-
2005
- 2005-09-13 WO PCT/JP2005/016812 patent/WO2006033263A1/ja active Application Filing
- 2005-09-13 US US11/575,744 patent/US8254791B2/en not_active Expired - Fee Related
-
2012
- 2012-06-15 US US13/524,944 patent/US8750721B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002290335A (ja) * | 2001-03-28 | 2002-10-04 | Sony Corp | 光空間伝送装置 |
JP2004297425A (ja) * | 2003-03-27 | 2004-10-21 | Toshiba Corp | ワイヤレス光通信システム |
JP2005216780A (ja) * | 2004-01-30 | 2005-08-11 | Matsushita Electric Works Ltd | 照明装置 |
Cited By (8)
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US20160248504A1 (en) * | 2007-03-30 | 2016-08-25 | Samsung Electronics Co., Ltd. | Visible light transmitter, visible light receiver, visible light communication system, and visible light communication method |
US9906298B2 (en) * | 2007-03-30 | 2018-02-27 | Samsung Electronics Co., Ltd. | Visible light transmitter, visible light receiver, visible light communication system, and visible light communication method |
US9276675B2 (en) * | 2007-05-30 | 2016-03-01 | Samsung Electronics Co., Ltd. | Apparatus and method for transferring an optical signal in a wireless visible light communication system |
DE102007043255A1 (de) * | 2007-09-11 | 2009-03-12 | Siemens Ag | Datenübertragung mit Leuchtdioden-Raumbeleuchtungen |
US20100254714A1 (en) * | 2007-09-11 | 2010-10-07 | Oscar Cristobal Gaete Jamett | Data transmission with room illuminations having light emitting diodes |
US8811826B2 (en) | 2007-09-11 | 2014-08-19 | Siemens Aktiengesellschaft | Data transmission with room illuminations having light emitting diodes |
DE102007043255B4 (de) * | 2007-09-11 | 2016-09-22 | Siemens Aktiengesellschaft | Verfahren und Anordnung zur Aussendung von Daten |
CN101232329B (zh) * | 2007-11-28 | 2012-05-30 | 华东理工大学 | 一种采用干扰抵消技术的可见光通信系统 |
Also Published As
Publication number | Publication date |
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US8750721B2 (en) | 2014-06-10 |
US8254791B2 (en) | 2012-08-28 |
US20120301155A1 (en) | 2012-11-29 |
US20080063410A1 (en) | 2008-03-13 |
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