JP2005176258A - Optical transmission system - Google Patents

Optical transmission system Download PDF

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JP2005176258A
JP2005176258A JP2003417088A JP2003417088A JP2005176258A JP 2005176258 A JP2005176258 A JP 2005176258A JP 2003417088 A JP2003417088 A JP 2003417088A JP 2003417088 A JP2003417088 A JP 2003417088A JP 2005176258 A JP2005176258 A JP 2005176258A
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receiver
data
illumination light
lighting fixtures
modulation frequency
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JP4534476B2 (en
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Tatsu Fushimi
竜 伏見
Kazufumi Nagasoe
和史 長添
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical transmission system wherein a receiver accurately receives data transmitted from each of lighting fixtures even when a plurality of the lighting fixtures are present, the arrival ranges of illumination light from the lighting fixtures being in duplicate at least partly. <P>SOLUTION: Modulation frequencies used to superimpose data are different among a plurality of the lighting fixtures A1 to A4 from one another, wherein the arrival ranges of illumination light from the lighting fixtures are in duplicate at least partly. The receiver 10 selects one or more frequency components in frequency components discriminated by a plurality of band pass filters 15k to output the selected components to a demodulation circuit 16. Thus, it is avoided that the receiver 10 nearly simultaneously receives the data transmitted from a plurality of the lighting fixtures Ak and the receiver 10 cannot correctly demodulate all of the data, and the receiver 10 can accurately receive the data transmitted from each of the lighting fixtures Ak even in an area wherein the arrival ranges of the illumination light from the lighting fixtures are in duplicate at least partly. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、照明光にデータを重畳させて伝送する複数の照明器具と、照明光に重畳されたデータを受信する受信機とを有する光伝送システムに関するものである。   The present invention relates to an optical transmission system including a plurality of lighting fixtures that transmit data superimposed on illumination light and a receiver that receives data superimposed on the illumination light.

従来より、照明光にデータを重畳させて伝送する複数の照明器具と、照明光に重畳されたデータを受信する受信機とを有する光伝送システムが種々提案されている（例えば、特許文献１並びに特許文献２参照）。   Conventionally, various optical transmission systems having a plurality of luminaires that transmit data superimposed on illumination light and a receiver that receives data superimposed on illumination light have been proposed (for example, Patent Document 1 and Patent Document 2).

図１４はこの種の光伝送システムの照明器具に搭載されて光源を点灯する点灯装置の一例を示す概略回路構成図である。この点灯装置は、蛍光灯のような放電灯を点灯するための放電灯点灯装置であって、商用の交流電源ＡＣを整流平滑して直流電圧・電流を作成する直流電源部１と、直流電源部１の直流出力を高周波交流に変換して放電灯３に出力するインバータ回路２とを備える。   FIG. 14 is a schematic circuit configuration diagram showing an example of a lighting device that is mounted on a lighting fixture of this type of light transmission system and lights a light source. This lighting device is a discharge lamp lighting device for lighting a discharge lamp such as a fluorescent lamp, and includes a DC power supply unit 1 that rectifies and smoothes a commercial AC power supply AC to create a DC voltage / current, and a DC power supply. And an inverter circuit 2 that converts the direct current output of the unit 1 into high frequency alternating current and outputs it to the discharge lamp 3.

直流電源部１はダイオードブリッジＤＢからなる全波整流器と、平滑コンデンサＣ１とで構成される。インバータ回路２は所謂ハーフブリッジ型であって、直流電源部１の出力端間に直列接続された２つのスイッチング素子Ｑ１，Ｑ２と、ローサイドのスイッチング素子Ｑ２の両端にカップリングコンデンサＣ２を介して直列接続されたインダクタＬ１及びコンデンサＣ３からなる共振回路とで構成され、コンデンサＣ３の両端（出力端）に放電灯３が接続される。２つのスイッチング素子Ｑ１，Ｑ２は発振回路４から出力されるパルス状の駆動信号によって互いに相補的にスイッチングされる。照明光にデータを重畳させる制御回路５は、送信源６から与えられるデータ信号（Ｈ，Ｌの２値信号）の立ち上がり及び立ち下がり部分の整形や振幅の一定化を行う送信回路５ａと、送信回路５ａで波形処理等がされたデータ信号に応じて発振回路４の発振周波数（スイッチング素子Ｑ１，Ｑ２をスイッチングする駆動信号の周波数）を変調（例えば、ＦＳＫ変調）する周波数変調回路５ｂとを具備し、例えば、マイクロコンピュータ等で構成される。周波数変調回路５ｂは、データ信号がＬレベルのときに発振回路４から出力する駆動信号の周波数（インバータ回路２の動作周波数）を、放電灯３を定格点灯させるために必要な電力が供給可能である動作周波数（以下、点灯周波数と呼ぶ）に設定し、データ信号がＨレベルのときには点灯周波数よりも高い周波数（以下、変調周波数と呼ぶ）に設定する。なお、放電灯３の点灯時におけるインバータ回路２の出力特性は共振回路並びに放電灯３を含めた共振系の共振周波数にピークを持つ山型の波形となり、通常は点灯周波数を共振周波数よりも高い周波数に設定しているから、インバータ回路２の動作周波数を点灯周波数から変調周波数に変化させるとインバータ回路２から放電灯３への供給電力が減少して光出力も低下することになる。   The DC power supply unit 1 includes a full-wave rectifier including a diode bridge DB and a smoothing capacitor C1. The inverter circuit 2 is a so-called half-bridge type, and is connected in series with two switching elements Q1 and Q2 connected in series between the output ends of the DC power supply unit 1 and both ends of the low-side switching element Q2 via a coupling capacitor C2. The discharge lamp 3 is connected to both ends (output ends) of the capacitor C3. The resonance circuit includes a connected inductor L1 and a capacitor C3. The two switching elements Q1 and Q2 are complementarily switched by the pulsed drive signal output from the oscillation circuit 4. The control circuit 5 for superimposing data on the illumination light includes a transmission circuit 5a for shaping the rising and falling portions of the data signal (H and L binary signals) given from the transmission source 6 and making the amplitude constant, and transmission. A frequency modulation circuit 5b that modulates (for example, FSK modulation) the oscillation frequency of the oscillation circuit 4 (the frequency of the drive signal that switches the switching elements Q1 and Q2) according to the data signal that has undergone waveform processing or the like by the circuit 5a. For example, it is composed of a microcomputer or the like. The frequency modulation circuit 5b can supply the frequency of the drive signal output from the oscillation circuit 4 (the operating frequency of the inverter circuit 2) when the data signal is at the L level, and the power necessary to turn on the discharge lamp 3 at rated power. A certain operating frequency (hereinafter referred to as a lighting frequency) is set, and when the data signal is at the H level, a frequency higher than the lighting frequency (hereinafter referred to as a modulation frequency) is set. The output characteristic of the inverter circuit 2 when the discharge lamp 3 is turned on is a mountain-shaped waveform having a peak at the resonance frequency of the resonance system and the resonance system including the discharge lamp 3, and the lighting frequency is usually higher than the resonance frequency. Since the frequency is set, if the operating frequency of the inverter circuit 2 is changed from the lighting frequency to the modulation frequency, the power supplied from the inverter circuit 2 to the discharge lamp 3 is reduced and the light output is also reduced.

一方、受信機１０は、図１５に示すようにデータが重畳された照明光を受光してデータを復調する受光モジュール１１と、受光モジュール１１から出力されるデータ信号を外部の電子機器１００に伝送する伝送回路１２とで構成される。受光モジュール１１は、フォトダイオードや太陽電池などの光電変換素子を有して受光した照明光を電気信号に変換する受光部１３と、受光部１３の出力信号（受信信号）を増幅する増幅回路１４と、増幅回路１４で増幅された受信信号から変調周波数の周波数成分を弁別する帯域通過（バンドパス）フィルタ１５と、バンドパスフィルタ１５で弁別された周波数成分から元のデータ信号を復調する復調回路１６とを具備している。ここで、図１６（ａ）に示すように放電灯３に流れるランプ電流はインバータ回路２の動作周波数に同期して周期的に変化するが、照明光については同図（ｂ）に示すようにインバータ回路２の動作周波数の２倍の周波数で変化するから、バンドパスフィルタ１５における通過帯域の中心周波数を変調周波数の２倍に設定する必要がある。   On the other hand, as shown in FIG. 15, the receiver 10 receives illumination light on which data is superimposed and demodulates the data, and transmits a data signal output from the light reception module 11 to an external electronic device 100. And the transmission circuit 12 to be configured. The light receiving module 11 includes a photoelectric conversion element such as a photodiode or a solar battery, and converts the received illumination light into an electrical signal. A band-pass filter 15 for discriminating the frequency component of the modulation frequency from the received signal amplified by the amplifier circuit 14, and a demodulator circuit for demodulating the original data signal from the frequency component discriminated by the band-pass filter 15 16. Here, as shown in FIG. 16 (a), the lamp current flowing through the discharge lamp 3 periodically changes in synchronization with the operating frequency of the inverter circuit 2, but the illumination light is as shown in FIG. 16 (b). Since the frequency changes at twice the operating frequency of the inverter circuit 2, it is necessary to set the center frequency of the passband in the bandpass filter 15 to be twice the modulation frequency.

上述のような照明器具と受信機１０で構成される光伝送システムは、例えば、図１７（ａ）に示すように通路の天井に複数の照明器具Ａ１，Ａ２，…が所定間隔で配設され、この通路を移動する利用者Ｈが受信機１０を携帯し、照明器具Ａ１，…の照明光に重畳されているデータを受信機１０で受信し且つ復調して電子機器１００（例えば、携帯電話やＰＤＡ端末など）に伝送し、受信したデータで示される情報（例えば、建物内の位置情報など）を電子機器１００の画面に表示したり、スピーカから音声メッセージとして出力することで利用者Ｈに種々の情報を提供する目的などに利用される。ここで、複数の照明器具Ａ１，…は、図１７（ｂ）に示すように隣り合う照明器具Ａ１，…の照明光の到達範囲Ｓ１，Ｓ２，…が部分的に重なるような間隔で配設されており、到達範囲Ｓ１，…の重複部分ＳＳ１，ＳＳ２，…では２つの照明器具Ａ１とＡ２，Ａ２とＡ３，…からのデータが受信できることになる。
特開昭６０−３２４４３号公報 特開平１１−３１３０３４号公報 In the optical transmission system including the lighting fixture and the receiver 10 as described above, for example, as shown in FIG. 17A, a plurality of lighting fixtures A1, A2,. The user H moving along this passage carries the receiver 10, receives the data superimposed on the illumination light of the lighting fixtures A1,... To the user H by displaying information (for example, location information in the building) displayed on the screen of the electronic device 100 or outputting it as a voice message from the speaker. It is used for the purpose of providing various information. Here, as shown in FIG. 17B, the plurality of lighting fixtures A1,... Are arranged at intervals such that the illumination light arrival ranges S1, S2,. In the overlapping portions SS1, SS2,... Of the reachable range S1,..., Data from the two lighting fixtures A1 and A2, A2 and A3,.
JP-A-60-32443 JP 11-313034 A

ところで、上述のような光伝送システムにおいて、複数の照明器具Ａ１，…がそれぞれデータ伝送に同一の変調周波数を使用し、図１８に示すように一定の休止期間Ｔｘ（例えば、１ｍｓ）を空けながら一定の送信期間Ｔｗ（例えば、１０ｍｓ）で同一のデータを周期的に送信しているものとすると、各照明器具Ａ１，…の送信期間Ｔｗが重なってしまうため、利用者Ｈが到達範囲Ｓ１，…の重複部分ＳＳ１，…に居るときには２つの照明器具Ａ１とＡ２，…から送信されたデータをほぼ同時に受信してしまい、何れのデータも正しく復調できなくなってしまう。すなわち、この従来システムではそれぞれの照明器具Ａ１，…から伝送される情報（データ）を正確に取得できない領域（ＳＳ１，ＳＳ２，…）が存在するという問題があった。   By the way, in the optical transmission system as described above, the plurality of lighting fixtures A1,... Each use the same modulation frequency for data transmission, while leaving a certain pause period Tx (for example, 1 ms) as shown in FIG. If the same data is periodically transmitted in a certain transmission period Tw (for example, 10 ms), the transmission periods Tw of the respective lighting fixtures A1,. .., The data transmitted from the two luminaires A1, A2,... Are received almost simultaneously, and any data cannot be demodulated correctly. That is, this conventional system has a problem in that there are areas (SS1, SS2,...) Where information (data) transmitted from the respective lighting fixtures A1,.

一方、上述のような問題を解決するため、図１９に示すように複数の照明器具Ａ１，Ａ２，…を互いの到達範囲Ｓ１，Ｓ２，…が重複しないように間隔を広げて配設し、それぞれの照明器具Ａ１，…の間にデータ伝送機能を有しない点灯装置を備えた一般の照明器具Ｂ１，Ｂ２，…を配設するようにした光伝送システムが提供されている。しかしながら、この従来システムにおいては情報が全く取得できない領域が存在することになり、例えば、位置情報を伝送するシステムなどにおいて不都合が生じる。   On the other hand, in order to solve the above-described problem, as shown in FIG. 19, a plurality of lighting fixtures A1, A2,... Are arranged with a wide interval so that the reach ranges S1, S2,. There is provided an optical transmission system in which general lighting fixtures B1, B2,... Having a lighting device having no data transmission function are arranged between the respective lighting fixtures A1,. However, in this conventional system, there is a region where no information can be acquired, and inconvenience occurs in, for example, a system that transmits position information.

本発明は上記事情に鑑みて為されたものであり、その目的は、照明光の到達範囲が少なくとも一部で重複する複数の照明器具が存在する場合でも各照明器具から伝送されるデータを受信機で正確に受信することができる光伝送システムを提供することにある。   The present invention has been made in view of the above circumstances, and the object thereof is to receive data transmitted from each lighting fixture even when there are a plurality of lighting fixtures in which the reach of illumination light overlaps at least partially. It is an object of the present invention to provide an optical transmission system that can be accurately received by an apparatus.

請求項１の発明は、上記目的を達成するために、照明光にデータを重畳させて伝送する複数の照明器具と、照明光に重畳されたデータを受信する受信機とを有する光伝送システムにおいて、複数の照明器具は、照明光を照射する光源と、直流電力を高周波交流電力に変換し光源に供給して点灯する点灯手段と、点灯手段が直流電力を高周波交流電力に変換する際の動作周波数を変調して照明光にデータを重畳させる伝送制御手段とを備え、受信機は、照明光を受光して電気信号に変換する受光手段と、受光手段から出力する受信信号から複数の変調周波数成分を弁別するとともに少なくとも何れか一つの変調周波数成分からデータを復調する処理手段とを備え、照明光の到達範囲が少なくとも一部で重複する複数の照明器具が存在する場合に当該複数の照明器具では伝送制御手段がデータを重畳させるための変調周波数を互いに異ならせたことを特徴とする。   In order to achieve the above object, an invention according to claim 1 is an optical transmission system comprising a plurality of lighting fixtures that transmit data superimposed on illumination light, and a receiver that receives data superimposed on illumination light. A plurality of lighting fixtures, a light source for illuminating illumination light, lighting means for converting DC power to high frequency AC power and supplying the light source for lighting, and operation when the lighting means converts DC power to high frequency AC power A transmission control unit that modulates the frequency and superimposes the data on the illumination light, the receiver receives the illumination light and converts it into an electrical signal, and a plurality of modulation frequencies from the reception signal output from the light reception unit And a processing unit that discriminates components and demodulates data from at least one modulation frequency component, and there is a plurality of luminaires in which the reach of illumination light overlaps at least partially The luminaire of the plurality wherein the transmission control means is made different from each other modulation frequencies for superposing data.

この発明によれば、照明光の到達範囲が少なくとも一部で重複する複数の照明器具が存在する場合に当該複数の照明器具では伝送制御手段がデータを重畳させるための変調周波数を互いに異ならせ、受光手段から出力する受信信号から複数の変調周波数成分を弁別するとともに少なくとも何れか一つの変調周波数成分からデータを復調する処理手段を受信機に備えたので、複数の照明器具から照射される照明光の到達範囲が重複している領域においても各照明器具から伝送されるデータを受信機で正確に受信することができる。   According to the present invention, when there are a plurality of lighting fixtures in which the reach of the illumination light overlaps at least in part, the plurality of lighting fixtures have different modulation frequencies for the transmission control means to superimpose data on each other, Since the receiver is provided with processing means for discriminating a plurality of modulation frequency components from the received signal output from the light receiving means and demodulating data from at least one modulation frequency component, the illumination light emitted from the plurality of lighting fixtures The data transmitted from each lighting fixture can be accurately received by the receiver even in the region where the reachable ranges are overlapped.

請求項２の発明は、請求項１の発明において、受信機は、処理手段で弁別された複数の変調周波数成分を各々記憶する記憶手段を備えたことを特徴とする。   The invention of claim 2 is characterized in that, in the invention of claim 1, the receiver comprises storage means for storing each of a plurality of modulation frequency components discriminated by the processing means.

この発明によれば、複数の照明器具から伝送される複数のデータを略同時に取得することが可能となる。   According to the present invention, it is possible to acquire a plurality of data transmitted from a plurality of lighting fixtures substantially simultaneously.

請求項３の発明は、請求項１又は２の発明において、受信機は、処理手段で弁別された複数の変調周波数成分の信号レベルを比較する比較手段を備え、処理手段は、比較手段の比較結果に基づいて信号レベルが最も大きい変調周波数成分からデータを復調することを特徴とする。   According to a third aspect of the present invention, in the first or second aspect of the invention, the receiver includes a comparison unit that compares signal levels of a plurality of modulation frequency components discriminated by the processing unit, and the processing unit compares the comparison unit. Data is demodulated from a modulation frequency component having the largest signal level based on the result.

この発明によれば、複数の変調周波数成分のうちで信号レベルが最も大きい変調周波数成分のみからデータを復調するため、受信機との距離が最も近い照明器具から伝送されるデータを取得することが可能となる。   According to the present invention, since data is demodulated only from the modulation frequency component having the highest signal level among the plurality of modulation frequency components, it is possible to acquire the data transmitted from the luminaire closest to the receiver. It becomes possible.

請求項４の発明は、請求項１の発明において、受信機の処理手段は、複数の通過帯域が択一的に切換可能な帯域通過フィルタを有し、該帯域通過フィルタの通過帯域を時分割で切り換えながら複数の変調周波数成分を弁別することを特徴とする。   According to a fourth aspect of the present invention, in the first aspect of the invention, the processing means of the receiver includes a bandpass filter that can selectively switch a plurality of passbands, and the passband of the bandpass filter is time-divisionally divided. It is characterized in that a plurality of modulation frequency components are discriminated while switching at.

この発明によれば、回路構成の簡素化によるコストダウン並びに小型化が図れる。   According to the present invention, the cost can be reduced and the size can be reduced by simplifying the circuit configuration.

本発明によれば、照明光の到達範囲が少なくとも一部で重複する複数の照明器具が存在する場合に当該複数の照明器具では伝送制御手段がデータを重畳させるための変調周波数を互いに異ならせ、受光手段から出力する受信信号から複数の変調周波数成分を弁別するとともに少なくとも何れか一つの変調周波数成分からデータを復調する処理手段を受信機に備えたので、複数の照明器具から照射される照明光の到達範囲が重複している領域においても各照明器具から伝送されるデータを受信機で正確に受信することができるという効果がある。   According to the present invention, when there are a plurality of lighting fixtures in which the reach of illumination light overlaps at least in part, in the plurality of lighting fixtures, the transmission control means makes the modulation frequency for superimposing data different from each other, Since the receiver is provided with processing means for discriminating a plurality of modulation frequency components from the received signal output from the light receiving means and demodulating data from at least one modulation frequency component, the illumination light emitted from the plurality of lighting fixtures There is an effect that the data transmitted from the respective lighting fixtures can be accurately received by the receiver even in the region where the reachable ranges of the two are overlapped.

（実施形態１）
本実施形態の光伝送システムは、介護施設や病院における視覚障害者向けの自立支援に利用されるものである。但し、これ以外の場所や用途に用いられる光伝送システムにも本発明の技術思想が適用可能であることはいうまでもない。 (Embodiment 1)
The optical transmission system of this embodiment is used for independence support for visually handicapped persons in care facilities and hospitals. However, it goes without saying that the technical idea of the present invention can also be applied to an optical transmission system used for other places and uses.

本実施形態の光伝送システムを構成する複数の照明器具Ａ１，Ａ２，…は何れも共通の構成を有し、図１（ａ）に示すように介護施設や病院の通路等の天井に一定の間隔を空けて配設され、各々の配設場所を特定するための位置情報（例えば、男性トイレ前、女性トイレ前、階段前などを示す情報）のデータを照明光に重畳して周期的に伝送している。また個々の照明器具Ａ１，…が具備する点灯装置は、図１４に示した従来例の放電灯点灯装置と共通の構成を有するものであるから図示は省略するが、Ｈレベルのデータ信号の変調周波数が各照明器具Ａ１，…毎に異なる周波数に設定されている点が従来例と相違する。但し、直流電源部１を力率改善のために昇圧チョッパ回路で構成してもよいし、あるいは電池で構成することも可能である。また、インバータ回路２についてもハーフブリッジ型に限らず、フルブリッジ型などの他の形式のものでもよいし、直流電源部１を構成する昇圧チョッパ回路との間でスイッチング素子を兼用する構成であっても構わない。なお、各照明器具Ａ１，…に対してデータ信号を与える送信源６はＲＯＭなどの記憶素子や他の機器、ディップスイッチ等で構成する設定手段で構成可能である。   The plurality of lighting fixtures A1, A2,... Constituting the optical transmission system of the present embodiment all have a common configuration, and are fixed on the ceiling of a nursing facility or a hospital passage as shown in FIG. Positioned at intervals, the position information (for example, information indicating the front of the male toilet, the front of the female toilet, the front of the stairs, etc.) data for specifying the respective locations is periodically superimposed on the illumination light. Is transmitting. The lighting devices included in the individual lighting fixtures A1,... Have the same configuration as the conventional discharge lamp lighting device shown in FIG. The frequency is set to a different frequency for each of the lighting fixtures A1,. However, the DC power supply unit 1 may be configured with a boost chopper circuit for power factor improvement, or may be configured with a battery. Further, the inverter circuit 2 is not limited to the half-bridge type, but may be another type such as a full-bridge type, or a configuration that also serves as a switching element with the boost chopper circuit constituting the DC power supply unit 1. It doesn't matter. The transmission source 6 that provides a data signal to each of the lighting fixtures A1,.

一方、受信機１０は利用者Ｈが携帯可能な構造を有するものであって、図２に示すように受光モジュール１１と伝送回路１２を備える。受光モジュール１１は、従来例と共通の受光部１３、増幅回路１４並びに復調回路１６と、各々異なる通過帯域を有する複数のバンドバスフィルタ１５1，１５2，…，１５ｎと、複数のバンドパスフィルタ１５ｋ（ｋ＝１〜ｎ）で弁別された周波数成分のうちで１乃至複数の周波数成分を選択して復調回路１６に出力する制御部１７と、制御部１７に対して何れのバンドパスフィルタ１５ｋで弁別される周波数成分を選択するかを設定するための設定部１９とを具備している。例えば、設定部１９でバンドパスフィルタ１５3を選択すれば、このバンドバスフィルタ１５3で弁別される周波数成分のみが制御部１７から復調回路１６に出力されて復調回路１６で元のデータ信号に復調され、伝送回路１２を通じて電子機器１００に伝送される。 On the other hand, the receiver 10 has a structure that can be carried by the user H, and includes a light receiving module 11 and a transmission circuit 12 as shown in FIG. The light receiving module 11 includes a light receiving unit 13, an amplifier circuit 14, and a demodulating circuit 16 that are common to the conventional example, a plurality of bandpass filters 15 1 , 15 2 ,..., 15n each having a different pass band, and a plurality of bandpass filters. A control unit 17 that selects one or more frequency components from among the frequency components discriminated at 15k (k = 1 to n) and outputs them to the demodulation circuit 16, and any bandpass filter 15k for the control unit 17 And a setting unit 19 for setting whether to select the frequency component to be discriminated. For example, if the bandpass filter 15 3 is selected by the setting unit 19, only the frequency component discriminated by the bandpass filter 15 3 is output from the control unit 17 to the demodulation circuit 16 and converted to the original data signal by the demodulation circuit 16. Demodulated and transmitted to the electronic device 100 through the transmission circuit 12.

而して、照明光の到達範囲が重複しない照明器具Ａｋの変調周波数に対応したバンドパスフィルタ１５ｋを選択するように設定部１９で設定すれば、複数の照明器具Ａｋから送信されたデータをほぼ同時に受信してしまい、何れのデータも正しく復調できなくなってしまうということがなく、複数の照明器具Ａｋから照射される照明光の到達範囲が重複している領域においても各照明器具Ａｋから伝送されるデータを受信機１０で正確に受信することができる。   Thus, if the setting unit 19 is set so as to select the bandpass filter 15k corresponding to the modulation frequency of the lighting fixture Ak in which the reach of the illumination light does not overlap, the data transmitted from the plurality of lighting fixtures Ak is almost the same. It is not received at the same time, and any data cannot be demodulated correctly, and is transmitted from each lighting fixture Ak even in a region where the reach of illumination light irradiated from a plurality of lighting fixtures Ak overlaps. Data can be accurately received by the receiver 10.

例えば、図３に示すように照明器具Ａ１が男性トイレ前、照明器具Ａ２が女性トイレ前にそれぞれ設置されて各々の位置を表す位置情報を互いに異なる変調周波数で周期的に伝送しているものとしたとき、受信機１０を携帯した利用者Ｈが２つの照明器具Ａ１，Ａ２の照明光の到達範囲Ｓ１，Ｓ２が重複する領域に居る場合であっても、設定部１９によって設定された変調周波数のデータ信号のみが受信機１０で受信されるため、利用者Ｈにとって必要な情報（例えば、利用者Ｈが男性であれば「男性トイレ前」を表す位置情報）を確実に取得することができる。   For example, as shown in FIG. 3, the lighting fixture A1 is installed in front of the male toilet and the lighting fixture A2 is installed in front of the female toilet, and the position information representing each position is periodically transmitted at different modulation frequencies. When the user H carrying the receiver 10 is in a region where the illumination light arrival ranges S1 and S2 of the two lighting fixtures A1 and A2 overlap, the modulation frequency set by the setting unit 19 is set. Since only the data signal is received by the receiver 10, information necessary for the user H (for example, position information indicating “in front of the male toilet” if the user H is a male) can be reliably acquired. .

ところで、本実施形態では、受光部１３に入光する照明光から特定の波長の光のみを通過させる光学フィルタ１８が受信機１０の受光モジュール１１に設けてあり、照明光に含まれる赤外線領域、可視領域、紫外線領域などの適当な波長領域の光を選択的に受光する構成としており、例えば、赤外線領域を選択すれば、一般に普及している赤外線リモコンの受光モジュールを受信機１０の受光モジュール１１に流用することができてコストダウンが図れるという利点がある。また、放電灯３の種類によって出力レベルの高い波長成分を選択すれば、伝送距離を伸ばすことができるという利点がある。   By the way, in this embodiment, the optical filter 18 which passes only the light of a specific wavelength from the illumination light incident on the light receiving unit 13 is provided in the light receiving module 11 of the receiver 10, and an infrared region included in the illumination light, The light receiving module 11 is configured to selectively receive light in an appropriate wavelength region such as a visible region or an ultraviolet region. For example, when an infrared region is selected, a light receiving module of a commonly used infrared remote controller is used. There is an advantage that the cost can be reduced. Further, if a wavelength component having a high output level is selected according to the type of the discharge lamp 3, there is an advantage that the transmission distance can be extended.

（実施形態２）
実施形態１の光伝送システムにおいては、受信機１０で受信した位置情報によって利用者Ｈに目的地（例えば、男性トイレ）の位置を知らせることができるが、受信機１０を携帯している利用者Ｈの現在位置を知ることは困難である。そこで本実施形態は、複数の照明器具Ａ１，…からほぼ同時刻に位置情報を取得し、受信機１０を携帯する利用者Ｈに対して現在位置を知らせることを可能とするため、図４に示すように複数のバンドパスフィルタ１５1，１５2，…，１５ｎで弁別された周波数成分の信号をそれぞれ個別に記憶する複数の記憶部２０1，２０2，…，２０ｎを受信機１０の受光モジュール１１に具備している。 (Embodiment 2)
In the optical transmission system according to the first embodiment, the position information received by the receiver 10 can notify the user H of the position of the destination (for example, a male toilet), but the user who carries the receiver 10 It is difficult to know the current position of H. Therefore, in the present embodiment, position information is acquired from a plurality of lighting fixtures A1,... At approximately the same time, and the current position can be notified to the user H carrying the receiver 10. FIG. As shown, a plurality of storage units 20 1 , 20 2 ,..., 20 n that individually store frequency component signals discriminated by a plurality of band-pass filters 15 1 , 15 2 ,. The module 11 is provided.

例えば、図５に示すように３台の照明器具Ａ１，Ａ２，Ａ３が互いに等間隔で配設され、それぞれの照明光の到達範囲Ｓ１，Ｓ２，Ｓ３が部分的に重複する領域が存在する場合において、受信機１０を携帯した利用者が３つの到達範囲Ｓ１，Ｓ２，Ｓ３の重複領域に居るとすると、受信機１０では、各照明器具Ａ１，Ａ２，Ａ３から伝送されたデータ信号をほぼ同時刻に受信し、各照明器具Ａ１，Ａ２，Ａ３からのデータ信号が重畳されている周波数成分をバンドパスフィルタ１５1〜１５3で弁別して記憶部２０1〜２０3に記憶し、さらに制御部１７を通して順番に復調回路１６で復調したデータ信号を伝送回路１２から電子機器１００に伝送する。電子機器１００においては、本システムが導入されている施設内の地図情報と各照明器具Ａ１，Ａ２，…の設置箇所の情報が予めメモリに格納されており、３台の照明器具Ａ１，Ａ２，Ａ３からほぼ同時刻に位置情報（データ信号）が取得できたことから、これら３台の照明器具Ａ１，Ａ２，Ａ３からほぼ等距離にある位置の位置情報を地図情報から取得し、取得した位置情報（利用者の現在位置の情報）を液晶ディスプレイ上に地図表示するなどして利用者に知らせることができる。 For example, as shown in FIG. 5, when three lighting fixtures A1, A2, and A3 are arranged at equal intervals, there is a region where the respective illumination light reach ranges S1, S2, and S3 partially overlap. If the user carrying the receiver 10 is in the overlapping area of the three reachable ranges S1, S2, and S3, the receiver 10 receives the data signals transmitted from the respective lighting fixtures A1, A2, and A3 substantially the same. The frequency components received at the time and on which the data signals from the respective lighting fixtures A1, A2 and A3 are superimposed are discriminated by the bandpass filters 15 1 to 15 3 and stored in the storage units 20 1 to 20 3 , and the control unit The data signal demodulated by the demodulation circuit 16 in order through the transmission circuit 17 is transmitted from the transmission circuit 12 to the electronic device 100. In the electronic device 100, the map information in the facility where the present system is introduced and the information on the installation locations of the respective lighting fixtures A1, A2,... Are stored in the memory in advance, and the three lighting fixtures A1, A2,. Since the position information (data signal) can be acquired at approximately the same time from A3, the position information of positions that are approximately equidistant from these three lighting fixtures A1, A2, and A3 is acquired from the map information, and the acquired position Information (information on the current position of the user) can be notified to the user by displaying a map on the liquid crystal display.

ところで、上述のように受信機１０を携帯する利用者の現在位置が把握できれば、介護施設や病院における自立支援以外の用途にも本実施形態の光伝送システムを応用することが可能である。   By the way, if the current position of the user carrying the receiver 10 can be grasped as described above, the optical transmission system of the present embodiment can be applied to uses other than the independence support in a care facility or a hospital.

例えば、図６（ａ）に示すシステムでは、書籍売り場１１０の天井に多数の照明器具Ａｋ（ｋ＝１，２，…）がマトリクス状に配設されて各々が自己の位置情報を周期的に伝送し、売り場に陳列されている多数の書籍Ｂに取り付けられた受信機１０で照明器具Ａｋから伝送されるデータを受信し、これらの受信機１０からは書籍Ｂの書名等を特定するＩＤ番号と照明器具Ａｋから取得した位置情報のデータとが無線信号で定期的に送信されている。そして、利用者（書籍の購入者）Ｈが携帯する受信機１０では、利用者Ｈが探している書籍ＢのＩＤ番号が入力されると当該ＩＤ番号に一致する無線信号を受信して位置情報のデータを取得し、取得した位置情報のデータに基づいて当該書籍Ｂが陳列されている場所（実際には、書籍Ｂの近くに配設されている照明器具Ａｋの位置）を電子機器１００を介して利用者Ｈに知らせるのである。   For example, in the system shown in FIG. 6 (a), a large number of lighting fixtures Ak (k = 1, 2,...) Are arranged in a matrix on the ceiling of the book store 110, and each of them has its own position information periodically. ID number which transmits and receives the data transmitted from lighting fixture Ak with the receiver 10 attached to many books B displayed on the sales floor, and specifies the title etc. of the book B from these receivers 10 And the position information data acquired from the lighting fixture Ak are periodically transmitted as radio signals. Then, in the receiver 10 carried by the user (book purchaser) H, when the ID number of the book B being searched for by the user H is input, a radio signal matching the ID number is received and the position information is received. And the electronic device 100 is used to indicate the location where the book B is displayed (actually, the position of the lighting fixture Ak arranged near the book B) based on the acquired position information data. The user H is informed through this.

あるいは、図７に示すようにデータ伝送用の照明器具Ａ１，…からそれぞれ設置場所に対応した位置情報のデータを照明光に重畳して伝送し、受信機１０1〜１０3を利用者Ｈが携帯したり物品Ｃに取り付け、これらの受信機１０1〜１０3が照明器具Ａ１，…から位置情報を取得したとき、各受信機１０1，…の現在位置の情報を時間とともに一元管理する管理装置Ｍに対して無線信号で送信するようなシステム構成を基本として、物品販売店におけるマーケティング支援（トレーサビリティ）などへの応用も考えられる。例えば、上述の書籍売り場１１０における書籍Ｂの検索支援システムにマーケティング支援の機能を持たせることもできる。具体的な例で説明すると、図８（ａ）に示すように書籍売り場１１０の天井に配設されている多数の照明器具Ａｋがそれぞれ位置情報を周期的に伝送し、検索対象の書籍Ｂが陳列されている場所（照明器具Ａｋの配設場所）に向かって利用者Ｈが移動している間、移動経路中に配置されている照明器具Ａ１，…から取得した位置情報に基づいて利用者Ｈの現在位置を電子機器１０の表示画面に表示するとともに、当該電子機器１００から管理装置Ｍに対して移動する利用者Ｈの現在位置を無線信号で送信している。そして、管理装置Ｍでは利用者Ｈが売り場１１０内をどのような経路で移動したかを受信機１０から送られてくる現在位置の情報によって管理し、顧客の行動特性を分析して売り場１１０内での書籍の陳列場所等を適切に設定するためのマーケティング支援を行っている。 Alternatively, as shown in FIG. 7, the position information data corresponding to the installation location is transmitted from the lighting fixtures A1,... For data transmission superimposed on the illumination light, and the receiver H 1 receives the receivers 10 1 to 10 3. Management which carries around or attaches to the article C, and centrally manages information on the current position of each receiver 10 1 ,... Over time when these receivers 10 1 to 10 3 acquire position information from the lighting fixtures A 1 ,. Application to marketing support (traceability) in an article store is also conceivable on the basis of a system configuration in which the apparatus M transmits a radio signal. For example, the above-described book B search support system in the book store 110 may have a marketing support function. More specifically, as shown in FIG. 8A, a large number of lighting fixtures Ak arranged on the ceiling of the book store 110 periodically transmit position information, and the book B to be searched is While the user H is moving toward the displayed place (placement of the lighting fixture Ak), the user is based on the positional information acquired from the lighting fixtures A1,. The current position of H is displayed on the display screen of the electronic device 10, and the current position of the user H moving from the electronic device 100 to the management apparatus M is transmitted by a radio signal. In the management apparatus M, the route that the user H has moved in the sales floor 110 is managed based on the information on the current position sent from the receiver 10, and the behavior characteristics of the customer are analyzed to analyze the customer's behavior in the sales floor 110. Marketing support is provided to appropriately set the display location of books in Japan.

（実施形態３）
本実施形態における受信機１０のブロック図を図９に示す。本実施形態の受信機１０が実施形態１のものと異なる点は、複数のバンドバスフィルタ１５1，１５2，…，１５ｎで弁別された各変調周波数成分の信号レベル同士を比較して最も信号レベルが大きい変調周波数成分のみを制御部１７に出力する比較部２１を具備する点にある。 (Embodiment 3)
A block diagram of the receiver 10 in this embodiment is shown in FIG. The difference of the receiver 10 of this embodiment from that of the first embodiment is that the signal level of each modulation frequency component discriminated by the plurality of band-pass filters 15 1 , 15 2 ,. The comparison unit 21 that outputs only the modulation frequency component having a large level to the control unit 17 is provided.

而して、本実施形態の受信機１０では、複数の照明器具Ａ１，…から受信したデータ信号のうちで信号レベルが最も大きいデータ信号、つまり、最も近い距離にある照明器具Ａ１，…のデータ信号のみを選択して電子機器１００に出力するため、受信機１０の位置をより正確に把握することができるという利点がある。   Thus, in the receiver 10 of the present embodiment, the data signal having the highest signal level among the data signals received from the plurality of lighting fixtures A1,..., That is, the data of the lighting fixtures A1,. Since only the signal is selected and output to the electronic device 100, there is an advantage that the position of the receiver 10 can be grasped more accurately.

（実施形態４）
本実施形態における受信機１０のブロック図を図１０に示す。本実施形態の受信機１０は、複数の通過帯域が択一的に切換可能なバンドパスフィルタ１５と、バンドパスフィルタ１５で弁別された変調周波数成分を記憶する記憶部２０とを具備している。 (Embodiment 4)
FIG. 10 shows a block diagram of the receiver 10 in the present embodiment. The receiver 10 of this embodiment includes a bandpass filter 15 in which a plurality of passbands can be switched selectively, and a storage unit 20 that stores modulation frequency components discriminated by the bandpass filter 15. .

バンドパスフィルタ１５は複数の照明器具毎に設定されている複数の変調周波数の２倍の周波数を中心周波数とする複数の通過帯域ｆ１，ｆ２，…，ｆｎが切換可能に構成されており、図１１に示すように所定時間Ｔａ毎に複数の通過帯域ｆ１〜ｆｎを順次切り換えながら複数の変調周波数成分を弁別する。そして、時分割で弁別された複数の周波数変調成分が時系列で記憶部２０に記憶され、制御部１７によって順次読み出された変調周波数成分から復調回路１６によりデータが復調され、復調されたデータが伝送回路１２により電子機器１００に伝送される。   The band pass filter 15 is configured to be able to switch a plurality of pass bands f1, f2,..., Fn having a center frequency that is twice the plurality of modulation frequencies set for each of a plurality of lighting fixtures. 11, a plurality of modulation frequency components are discriminated while sequentially switching a plurality of passbands f1 to fn every predetermined time Ta. A plurality of frequency modulation components discriminated by time division are stored in the storage unit 20 in time series, and data is demodulated by the demodulation circuit 16 from the modulation frequency components sequentially read out by the control unit 17, and demodulated data. Is transmitted to the electronic device 100 by the transmission circuit 12.

而して、本実施形態の受信機１０では一つのバンドパスフィルタ１５で複数の変調周波数成分を弁別するため、回路構成の簡素化によるコストダウン並びに小型化が図れるという利点がある。   Thus, in the receiver 10 of the present embodiment, since a plurality of modulation frequency components are discriminated by the single band pass filter 15, there is an advantage that the cost can be reduced and the size can be reduced by simplifying the circuit configuration.

（実施形態５）
本実施形態における受信機１０のブロック図を図１２に示す。本実施形態の受信機１０は、所定の受光角φで光を受光部１３の受光素子に集光する光学系２２を備えている。なお、光学系２２の受光角φは照明器具Ａｋの配置に応じて約２０度〜４０度程度に設定される。また、制御部１７では複数のバンドパスフィルタ１５ｋで弁別された周波数成分を択一的に選択して復調回路１６に出力するのではなく、全てのバンドパスフィルタ１５ｋについて弁別された周波数成分が出力される都度、復調回路１６に出力する。よって、バンドパスフィルタ１５ｋを選択するための設定部１９は不要である。 (Embodiment 5)
A block diagram of the receiver 10 in this embodiment is shown in FIG. The receiver 10 according to the present embodiment includes an optical system 22 that focuses light on a light receiving element of the light receiving unit 13 at a predetermined light receiving angle φ. The light receiving angle φ of the optical system 22 is set to about 20 degrees to 40 degrees according to the arrangement of the lighting fixture Ak. In addition, the control unit 17 does not select and output the frequency components discriminated by the plurality of bandpass filters 15k to the demodulation circuit 16, but outputs the frequency components discriminated for all the bandpass filters 15k. Each time it is output, it is output to the demodulation circuit 16. Therefore, the setting unit 19 for selecting the bandpass filter 15k is unnecessary.

次に、上述のように構成される受信機１０を利用した光伝送システムの一例について説明する。この光伝送システムは、実施形態１でも簡単に説明したような介護施設や病院における視覚障害者向けの自立支援に利用されるものである。   Next, an example of an optical transmission system using the receiver 10 configured as described above will be described. This optical transmission system is used for independence support for visually handicapped persons in a nursing facility or hospital as briefly described in the first embodiment.

本システムにおける照明器具Ａｋは、図１３（ｂ）に示すように天井に直接取り付けられる直付け形であって、特に直管形の蛍光灯（放電灯）３を２灯有する「富士型器具」と呼ばれるものや、環形の蛍光灯を有する「シーリングライト」と呼ばれるものである。これらの照明器具Ａｋは、例えば、図１３（ａ）に示すようにデータ伝送機能を有しない一般の照明器具Ａｋ’とともに、介護施設のラウンジ２００や廊下２０１の天井に一定の間隔を空けて配設されている。   The luminaire Ak in this system is a direct-mounted type that is directly attached to the ceiling as shown in FIG. 13 (b), and particularly “Fuji-type luminaire” having two straight-tube fluorescent lamps (discharge lamps) 3. And a so-called “ceiling light” having a ring-shaped fluorescent lamp. For example, as shown in FIG. 13A, these lighting fixtures Ak are arranged at regular intervals on the ceilings of the lounge 200 and the corridor 201 of the nursing facility together with the general lighting fixtures Ak ′ that do not have a data transmission function. It is installed.

データ伝送用の照明器具Ａｋでは、その配設場所を特定するための位置情報、例えば、ラウンジ、男性トイレ前、女性トイレ前、階段前、廊下の突き当たりなどを示す位置情報のデータを照明光に重畳して周期的に伝送している。   In the lighting fixture Ak for data transmission, the position information for specifying the installation location, for example, position information data indicating the lounge, the front of the male toilet, the front of the female toilet, the front of the stairs, the end of the corridor, etc. is used as the illumination light. Superimposed and transmitted periodically.

一方、照明器具Ａｋから照射する照明光に重畳されたデータは、介護施設で介護を受ける被介護者（視覚障害者）Ｈが携帯する携帯端末６０で受信される。この携帯端末６０は、上述の受信機１０と電子機器１００を一体に備えるものであって、受信機１０で取得した位置情報に対応したメッセージデータをメモリ部から読み出す処理や読み出したメッセージデータを再生してスピーカから音声メッセージを出力する処理等を行う演算処理部を備えている。   On the other hand, the data superimposed on the illumination light emitted from the luminaire Ak is received by the portable terminal 60 carried by the care recipient (visually impaired person) H who receives care at the care facility. The portable terminal 60 includes the above-described receiver 10 and the electronic device 100 integrally. The portable terminal 60 performs processing for reading out message data corresponding to the position information acquired by the receiver 10 from the memory unit and playing back the read message data. And an arithmetic processing unit that performs processing for outputting a voice message from the speaker.

次に、本システムの動作について説明する。例えば、被介護者Ｈがラウンジ２００から男性トイレに移動しようとした場合、携帯端末６０の受光部１３を進行方向に向けて廊下２０１を移動し、受光角φ内で男性トイレ前に配設されている照明器具Ａｋからの照明光を受光すると照明光に重畳されているデータが携帯端末６０（受信機１０）で受信され、携帯端末６０のスピーカから「男性トイレ前です」というような位置情報に対応した音声メッセージが出力される。ここで携帯端末６０の演算処理部では、バンドパスフィルタ１５ｋで弁別された変調周波数成分の信号レベルが低いときほどスピーカから出力する音声メッセージに重畳するノイズ成分を増大させるようにしており、音声メッセージが明瞭に聞き取れる方向へ携帯端末６０の受光部１３が向けられることで目的地（この場合は男性トイレ）の位置を被介護者Ｈが正確に知ることができ、被介護者Ｈが自らの判断で目的地へ安全に移動することを支援することができるものである。   Next, the operation of this system will be described. For example, when the cared person H tries to move from the lounge 200 to the male toilet, he moves the corridor 201 with the light receiving unit 13 of the portable terminal 60 in the traveling direction and is disposed in front of the male toilet within the light receiving angle φ. When the illumination light from the lighting fixture Ak is received, the data superimposed on the illumination light is received by the portable terminal 60 (receiver 10), and the position information such as “in front of the male toilet” is received from the speaker of the portable terminal 60. A voice message corresponding to is output. Here, the arithmetic processing unit of the portable terminal 60 increases the noise component superimposed on the voice message output from the speaker as the signal level of the modulation frequency component discriminated by the bandpass filter 15k is lower. The care receiver H can accurately know the position of the destination (in this case, the male toilet) by directing the light-receiving unit 13 of the mobile terminal 60 in a direction in which the user can be clearly heard. Can help you to move safely to your destination.

実施形態１のシステム構成図である。1 is a system configuration diagram of Embodiment 1. FIG. 同上における受信機のブロック図である。It is a block diagram of the receiver same as the above. 同上の動作説明図である。It is operation | movement explanatory drawing same as the above. 実施形態２における受信機のブロック図である。6 is a block diagram of a receiver in Embodiment 2. FIG. 同上の動作説明図である。It is operation | movement explanatory drawing same as the above. 同上を用いた検索支援システムのシステム構成図である。It is a system configuration diagram of a search support system using the same as above. 同上を用いた応用システムのシステム構成図である。It is a system configuration | structure figure of the application system using the same as the above. 同上を用いたマーケティング支援システムのシステム構成図である。It is a system configuration diagram of a marketing support system using the same as above. 実施形態３における受信機のブロック図である。6 is a block diagram of a receiver in Embodiment 3. FIG. 実施形態４における受信機のブロック図である。10 is a block diagram of a receiver in Embodiment 4. FIG. 同上の動作説明用のタイムチャートである。It is a time chart for operation | movement description same as the above. 実施形態５における受信機のブロック図である。10 is a block diagram of a receiver in Embodiment 5. FIG. 同上を用いた自立支援システムのシステム構成図である。It is a system configuration figure of the independence support system using the same as the above. 従来例における照明器具の点灯装置を示す概略回路構成図である。It is a schematic circuit block diagram which shows the lighting device of the lighting fixture in a prior art example. 従来例における受信機のブロック図である。It is a block diagram of the receiver in a prior art example. 同上の動作説明図である。It is operation | movement explanatory drawing same as the above. 同上の動作説明図である。It is operation | movement explanatory drawing same as the above. 同上の動作説明図である。It is operation | movement explanatory drawing same as the above. 同上の動作説明図である。It is operation | movement explanatory drawing same as the above.

符号の説明Explanation of symbols

Ａ１〜Ａ４ 照明器具
１０ 受信機
１１ 受光モジュール
１３ 受光部
１５1〜１５ｎ バンドパスフィルタ
１６ 復調回路
１７ 制御部
１９ 設定部 A1 to A4 Lighting fixture 10 Receiver 11 Light receiving module 13 Light receiving unit 15 1 to 15n Band pass filter 16 Demodulating circuit 17 Control unit 19 Setting unit

Claims (4)

照明光にデータを重畳させて伝送する複数の照明器具と、照明光に重畳されたデータを受信する受信機とを有する光伝送システムにおいて、複数の照明器具は、照明光を照射する光源と、直流電力を高周波交流電力に変換し光源に供給して点灯する点灯手段と、点灯手段が直流電力を高周波交流電力に変換する際の動作周波数を変調して照明光にデータを重畳させる伝送制御手段とを備え、受信機は、照明光を受光して電気信号に変換する受光手段と、受光手段から出力する受信信号から複数の変調周波数成分を弁別するとともに少なくとも何れか一つの変調周波数成分からデータを復調する処理手段とを備え、照明光の到達範囲が少なくとも一部で重複する複数の照明器具が存在する場合に当該複数の照明器具では伝送制御手段がデータを重畳させるための変調周波数を互いに異ならせたことを特徴とする光伝送システム。   In an optical transmission system including a plurality of lighting fixtures that transmit data superimposed on illumination light and a receiver that receives data superimposed on the illumination light, the plurality of lighting fixtures includes a light source that emits illumination light, and Lighting means for converting direct current power to high frequency alternating current power and supplying the light source for lighting, and transmission control means for modulating the operating frequency when the lighting means converts direct current power to high frequency alternating current power and superimposing data on the illumination light A receiver that receives illumination light and converts the illumination light into an electrical signal; discriminates a plurality of modulation frequency components from the reception signal output from the light reception unit and outputs data from at least one modulation frequency component; And a processing means for demodulating the data, and when there are a plurality of luminaires in which the reach of the illumination light overlaps at least partly, the transmission control means in the plurality of luminaires transmits data An optical transmission system, characterized in that the modulation frequency was different from each other in order to tatami. 受信機は、処理手段で弁別された複数の変調周波数成分を各々記憶する記憶手段を備えたことを特徴とする請求項１記載の光伝送システム。   2. The optical transmission system according to claim 1, wherein the receiver includes storage means for storing each of a plurality of modulation frequency components discriminated by the processing means. 受信機は、処理手段で弁別された複数の変調周波数成分の信号レベルを比較する比較手段を備え、処理手段は、比較手段の比較結果に基づいて信号レベルが最も大きい変調周波数成分からデータを復調することを特徴とする請求項１又は２記載の光伝送システム。   The receiver includes comparison means for comparing the signal levels of the plurality of modulation frequency components discriminated by the processing means, and the processing means demodulates data from the modulation frequency component having the highest signal level based on the comparison result of the comparison means. The optical transmission system according to claim 1 or 2, characterized in that: 受信機の処理手段は、複数の通過帯域が択一的に切換可能な帯域通過フィルタを有し、該帯域通過フィルタの通過帯域を時分割で切り換えながら複数の変調周波数成分を弁別することを特徴とする請求項１記載の光伝送システム。   The processing means of the receiver has a bandpass filter that can selectively switch a plurality of passbands, and discriminates a plurality of modulation frequency components while switching the passbands of the bandpass filters in a time division manner. The optical transmission system according to claim 1.
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