JP2009290359A - Visible light communication system - Google Patents

Visible light communication system Download PDF

Info

Publication number
JP2009290359A
JP2009290359A JP2008138600A JP2008138600A JP2009290359A JP 2009290359 A JP2009290359 A JP 2009290359A JP 2008138600 A JP2008138600 A JP 2008138600A JP 2008138600 A JP2008138600 A JP 2008138600A JP 2009290359 A JP2009290359 A JP 2009290359A
Authority
JP
Japan
Prior art keywords
visible light
signal
discharge lamp
operating frequency
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2008138600A
Other languages
Japanese (ja)
Other versions
JP5171393B2 (en
Inventor
Kazufumi Nagasoe
和史 長添
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Panasonic Electric Works Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Electric Works Co Ltd filed Critical Panasonic Electric Works Co Ltd
Priority to JP2008138600A priority Critical patent/JP5171393B2/en
Publication of JP2009290359A publication Critical patent/JP2009290359A/en
Application granted granted Critical
Publication of JP5171393B2 publication Critical patent/JP5171393B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Optical Communication System (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To vary a dimming level even during visible light communication by a visible light communication system and to simplify the constitution. <P>SOLUTION: The visible light communication system 1 includes a luminaire 2 which transmits a visible light signal, and a receiver 3. The luminaire 2 includes a discharge lamp 21, a dimming input unit 22, a signal source 23 which generates transmission data, a control unit 24 which generates a frequency control signal for the visible light signal, and a lighting circuit 25. The control unit 24 modulates the transmission data into a visible light signal comprising pulse light as a high output of the discharge lamp 21 and pulse light as a low output. The control unit 24 increases or decreases the pulse length of the pulse light as the low output according to the dimming level. Consequently, the rate of a lighting time of the pulse light as the low output varies, so the dimming level can be varied even during visible light communication. Further, the operating frequency of the discharge lamp is not varied according to the dimming level, so the constitution of the visible light communication system is simplified. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、放電灯の光の周波数を変調することによってデータの通信を行なう可視光通信システムに関する。   The present invention relates to a visible light communication system that performs data communication by modulating the frequency of light of a discharge lamp.

従来から、ＮＲＺ（Non Return to Zero）方式によって変調するビットパターンによって光出力波形を制御する可視光通信システムが知られている（例えば、特許文献１参照）。この可視光通信システムでは、送信データの「０」と「１」にそれぞれ個別の動作周波数の照明光を割り当て、インバータ回路によって放電灯の点灯回路の動作周波数を送信データに基づいて変化させて通信を行なう。   Conventionally, a visible light communication system that controls an optical output waveform by a bit pattern modulated by an NRZ (Non Return to Zero) method is known (see, for example, Patent Document 1). In this visible light communication system, illumination light having individual operating frequencies is assigned to “0” and “1” of transmission data, and the inverter circuit changes the operating frequency of the discharge lamp lighting circuit based on the transmission data. To do.

この可視光通信システムにおいては、点灯回路が共振周波数を有するので、放電灯の点灯回路の動作周波数を変化させることにより放電灯の出力を変え、調光レベルを調整することができる。しかしながら、この可視光通信システムにおいては、送信データの「０」及び「１」のそれぞれの動作周波数が固定されていることから、送信データを送信するときには動作周波数を変化させて放電灯の調光レベルを変えることができない。   In this visible light communication system, since the lighting circuit has a resonance frequency, it is possible to adjust the dimming level by changing the output of the discharge lamp by changing the operating frequency of the lighting circuit of the discharge lamp. However, in this visible light communication system, the operating frequencies of “0” and “1” of the transmission data are fixed. Therefore, when transmitting the transmission data, the operating frequency is changed to dimm the discharge lamp. The level cannot be changed.

また、データを送信する送信器が、「０」及び「１」の動作周波数が調光レベルに応じて定められたデータテーブルを記憶するメモリを有し、入力された調光レベルに応じて「０」及び「１」の動作周波数を変化させて通信する可視光通信システムが知られている（例えば、特許文献２参照）。このデータテーブルには、「０」と「１」の動作周波数が一定の差を保って定められ、かつ、明るい調光レベルに対しては放電灯の出力が高くなる動作周波数が定められ、暗い調光レベルに対しては放電灯の出力が低くなる動作周波数が定められている。送信機は、データテーブルに基づいて、入力された調光レベルに応じた動作周波数で「０」と「１」の可視光信号を送信し、可視光信号を受信した受信器は、受信した可視光信号の動作周波数の変動量から「０」と「１」を識別する。これにより、可視光通信システムは、送信データを送信するときにも放電灯の動作周波数を変化させて放電灯の調光レベルを変えることができる。   Further, the transmitter for transmitting data has a memory for storing a data table in which the operating frequencies of “0” and “1” are determined according to the dimming level, and according to the input dimming level, “ There is known a visible light communication system that performs communication by changing operating frequencies of “0” and “1” (see, for example, Patent Document 2). In this data table, the operating frequencies of “0” and “1” are determined with a certain difference, and the operating frequency at which the output of the discharge lamp is increased for a bright dimming level is determined to be dark. An operating frequency at which the output of the discharge lamp is lowered is determined for the dimming level. The transmitter transmits visible light signals of “0” and “1” at an operating frequency corresponding to the input dimming level based on the data table, and the receiver that receives the visible light signal receives the received visible light signal. “0” and “1” are identified from the fluctuation amount of the operating frequency of the optical signal. Thus, the visible light communication system can change the dimming level of the discharge lamp by changing the operating frequency of the discharge lamp even when transmitting transmission data.

しかしながら、この可視光通信システムにおいては、動作周波数のデータテーブルを記憶するメモリ等を有しなければならないので、可視光通信システムの構成が複雑となりコスト高となる。
特開２００６−２３７８６９号公報 特開２００８−１０４０２０号公報 However, since this visible light communication system must have a memory or the like for storing a data table of operating frequencies, the structure of the visible light communication system becomes complicated and the cost increases.
JP 2006-237869 A JP 2008-104020 A

本発明は、上記問題を解消するものであり、可視光通信を行なっているときも調光レベルを変えることができ、かつ、構成が簡単な可視光通信システムを提供することを目的とする。   An object of the present invention is to solve the above problems, and to provide a visible light communication system that can change the dimming level even during visible light communication and has a simple configuration.

上記目的を達成するために請求項１の発明は、放電灯を光源とし、該光源からの光をパルス位置変調により変調した可視光信号を可視光通信により送信する送信器と、前記送信器から送信された可視光信号を復調する受信器と、を備えた可視光通信システムにおいて、前記送信器は、前記放電灯の調光レベルを入力される調光入力部と、送信する送信データを作成する信号源と、前記調光入力部に入力された調光レベルと前記信号源によって作成された送信データとに基づいて前記可視光信号を制御する制御信号を作成する制御部と、前記制御部によって作成された前記制御信号に基づいて前記放電灯を点灯させる点灯回路と、を備え、前記可視光信号は、前記放電灯の出力が高出力である高出力照明光からなるパルス光と、前記放電灯の出力が低出力である低出力照明光からなるパルス光とを含み、パルス位置変調により変調され、前記制御部は、入力された調光レベルに応じて前記可視光信号のうちの前記高出力照明光、又は低出力照明光のパルス長を増減するものである。   In order to achieve the above object, the invention according to claim 1 is directed to a transmitter that uses a discharge lamp as a light source and transmits a visible light signal obtained by modulating the light from the light source by pulse position modulation through visible light communication, and the transmitter. In a visible light communication system comprising a receiver for demodulating a transmitted visible light signal, the transmitter creates a dimming input unit to which a dimming level of the discharge lamp is input and transmission data to be transmitted A control source for generating a control signal for controlling the visible light signal based on a light control level input to the light control input unit and transmission data generated by the signal source, and the control unit A lighting circuit for lighting the discharge lamp based on the control signal created by the above, the visible light signal is a pulsed light composed of high-power illumination light whose output of the discharge lamp is high power, and Discharge lamp Is modulated by pulse position modulation, and the control unit is configured to control the high-power illumination light in the visible light signal according to the input light control level. Or, the pulse length of the low-power illumination light is increased or decreased.

請求項２の発明は、請求項１に記載の可視光通信システムにおいて、前記制御部は、前記高出力照明光、又は低出力照明光のパルス長を前記受信器に伝えるためのトレーニング信号を前記可視光信号の前に挿入するものである。   According to a second aspect of the present invention, in the visible light communication system according to the first aspect, the control unit transmits a training signal for transmitting a pulse length of the high-power illumination light or low-power illumination light to the receiver. It is inserted before the visible light signal.

請求項１の発明によれば、入力された調光レベルに応じて可視光信号の内の高出力照明光、又は光低出力照明光のパルス長を増減させることにより、高出力照明光、又は低出力照明光による照明時間の割合が変化するので、可視光通信を行なっているときも調光レベルを変えることができる。また、放電灯の動作周波数を調光レベルに応じて変化させないので、可視光通信システムの構成が簡単になる。   According to the first aspect of the present invention, by increasing or decreasing the pulse length of the high-power illumination light or the light low-power illumination light in the visible light signal according to the input dimming level, Since the ratio of the illumination time by the low output illumination light changes, the dimming level can be changed even during visible light communication. Further, since the operating frequency of the discharge lamp is not changed according to the dimming level, the configuration of the visible light communication system is simplified.

請求項２の発明によれば、トレーニング信号により高出力照明光、又は低出力照明光のパルス長が受信器に伝えられるので、高出力照明光、又は低出力照明光のパルス光が連続するビットパターンを可視光信号に用いることができる。これにより、同一のパルス数で表すことができるデジタルデータの数を多くすることができるので、データの伝送効率が良い。   According to the invention of claim 2, since the pulse length of the high-power illumination light or the low-power illumination light is transmitted to the receiver by the training signal, the bit in which the pulse light of the high-power illumination light or the low-power illumination light continues. Patterns can be used for visible light signals. As a result, the number of digital data that can be expressed by the same number of pulses can be increased, so that the data transmission efficiency is good.

（第１の実施形態）
本発明の第１の実施形態に係る可視光通信システムについて図１乃至図４を参照して説明する。図１は可視光通信システムの構成を示す。可視光通信システム１は、放電灯２１を光源とし、放電灯２１からの光をパルス位置変調により変調し、変調した可視光信号を可視光通信により送信する照明器具（送信器）２と、照明器具２から送信された可視光信号を受信して復調する受信器３と、を備えている。この可視光通信システム１は、例えば、歩行者のナビゲーション用に設置されるもので、照明器具２は、照明器具２が設置された場所の位置情報を可視光通信によって送信する。受信器３は、例えば携帯電話やＰＤＡ（携帯端末）であり、照明器具２からの信号を受信し、位置情報を表示や音声によって出力する。ユーザは、受信器３を所持し、照明器具２からの可視光信号を受信することにより現在位置を知ることができる。また、放電灯２１は、省エネや照明による演出効果のために調光制御される。 (First embodiment)
A visible light communication system according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the configuration of a visible light communication system. The visible light communication system 1 uses a discharge lamp 21 as a light source, modulates light from the discharge lamp 21 by pulse position modulation, and transmits a modulated visible light signal by visible light communication, and an illumination. And a receiver 3 for receiving and demodulating a visible light signal transmitted from the instrument 2. The visible light communication system 1 is installed, for example, for navigation of pedestrians, and the lighting fixture 2 transmits position information of a place where the lighting fixture 2 is installed by visible light communication. The receiver 3 is, for example, a mobile phone or a PDA (mobile terminal), receives a signal from the luminaire 2, and outputs position information by display or sound. The user can know the current position by holding the receiver 3 and receiving a visible light signal from the lighting fixture 2. The discharge lamp 21 is dimmed and controlled for energy saving and lighting effects.

照明器具２は、放電灯２１の調光レベルをユーザに入力される調光入力部２２と、受信器３に送信する送信データを作成する信号源２３と、可視光信号の周波数を制御する制御部２４と、直流電源回路２６から直流電力を供給され、周波数制御信号に基づいて放電灯２１を点灯させる点灯回路２５と、を備えている。   The luminaire 2 includes a dimming input unit 22 that inputs the dimming level of the discharge lamp 21 to the user, a signal source 23 that creates transmission data to be transmitted to the receiver 3, and a control that controls the frequency of the visible light signal. And a lighting circuit 25 that is supplied with DC power from the DC power supply circuit 26 and lights the discharge lamp 21 based on the frequency control signal.

放電灯２１は、高周波電流により点灯する照明用光源であり、例えば蛍光灯や高輝度放電灯や無電極放電灯等である。調光入力部２２は、例えば調光レベルに応じて１ｋＨｚのＰＷＭ信号のオンデューティを変化させた調光信号を制御部２４へ出力する。調光信号は、調光レベルに応じてＤＣ電圧を１〜１０Ｖに変化させられた信号でもよい。信号源２３は、例えばＤＩＰスイッチやＲＯＭメモリであり、受信器３へ送信するための位置情報の送信データを記憶しており、制御部２４へ送信データを出力する。また、信号源２３は、ＬＡＮ等に接続されて外部装置から位置情報を取得してもよい。制御部２４は、送信データを「０」「１」のデジタルデータに変換し、デジタルデータに基づいて可視光信号の周波数を制御する周波数制御信号を作成して点灯回路２５を制御する。点灯回路２５は交流電力を作成するインバータ回路２７と、インバータ回路２７を駆動させる駆動信号を作成する駆動回路２８とを有している。   The discharge lamp 21 is an illumination light source that is lit by a high-frequency current, such as a fluorescent lamp, a high-intensity discharge lamp, or an electrodeless discharge lamp. For example, the dimming input unit 22 outputs a dimming signal obtained by changing the on-duty of the 1 kHz PWM signal in accordance with the dimming level to the control unit 24. The dimming signal may be a signal in which the DC voltage is changed to 1 to 10 V according to the dimming level. The signal source 23 is, for example, a DIP switch or ROM memory, stores transmission data of position information for transmission to the receiver 3, and outputs the transmission data to the control unit 24. Further, the signal source 23 may be connected to a LAN or the like to acquire position information from an external device. The control unit 24 converts the transmission data into digital data “0” and “1”, creates a frequency control signal for controlling the frequency of the visible light signal based on the digital data, and controls the lighting circuit 25. The lighting circuit 25 includes an inverter circuit 27 that generates AC power and a drive circuit 28 that generates a drive signal for driving the inverter circuit 27.

受信器３は、放電灯２１からの可視光信号を受信して電気信号に変換する光電変換部３１と、変換された電気信号を増幅する増幅部３２と、バンドパスフィルタ３３と、取り出された電気信号をデジタル信号に変換する変換部３４と、受信器制御部３５を備えている。光電変換部３１は、例えばＰＩＮフォトダイオード等を有している。光電変換部３１は、特定の波長の光のみを透過させる光学フィルタを有してもよい。光学フィルタによって可視光信号の受信精度が良くなる。増幅部３２は、例えばオペアンプやトランジスタ等を有している。バンドパスフィルタ３３は、増幅部３２によって増幅された電気信号から所定の周波数の電気信号を取り出す。変換部３４は、フィルタリングされた電気信号の周波数を所定の周波数と例えばコンパレータによって比較し、電気信号をデジタル信号に変換する。受信器制御部３５は、変換されたデジタル信号を送信データに復調する。   The receiver 3 receives a visible light signal from the discharge lamp 21 and converts it into an electrical signal, an amplification unit 32 that amplifies the converted electrical signal, and a bandpass filter 33. A conversion unit 34 that converts an electrical signal into a digital signal and a receiver control unit 35 are provided. The photoelectric conversion unit 31 includes, for example, a PIN photodiode. The photoelectric conversion unit 31 may include an optical filter that transmits only light of a specific wavelength. The optical filter improves the reception accuracy of visible light signals. The amplifying unit 32 includes, for example, an operational amplifier and a transistor. The band pass filter 33 extracts an electric signal having a predetermined frequency from the electric signal amplified by the amplifying unit 32. The converter 34 compares the frequency of the filtered electric signal with a predetermined frequency, for example, by a comparator, and converts the electric signal into a digital signal. The receiver control unit 35 demodulates the converted digital signal into transmission data.

図２は照明器具２の電気回路を示す。直流電源回路２６は、商用電源からの交流電流をダイオードＤ１乃至Ｄ４によって整流し、コンデンサＣ１によって平滑にする。駆動回路２８は制御部２４からの周波数制御信号に基づいてインバータ回路２７のスイッチング素子Ｑ１、Ｑ２をオンオフして任意の周波数の交流を作成し、放電灯２１を点灯させる。ここで、インバータ回路２７はチョークコイルＬ１とコンデンサＣ３とにより共振周波数を有している。このインバータ回路２７はハーフブリッジ式であるが、例えばフルブリッジ式や一石式でもよい。   FIG. 2 shows an electric circuit of the luminaire 2. The DC power supply circuit 26 rectifies the AC current from the commercial power supply by the diodes D1 to D4 and smoothes it by the capacitor C1. The drive circuit 28 turns on and off the switching elements Q1 and Q2 of the inverter circuit 27 based on the frequency control signal from the control unit 24 to create an alternating current with an arbitrary frequency, and turns on the discharge lamp 21. Here, the inverter circuit 27 has a resonance frequency due to the choke coil L1 and the capacitor C3. The inverter circuit 27 is a half bridge type, but may be a full bridge type or a single stone type, for example.

図３は、放電灯２１を点灯させる動作周波数と放電灯２１の出力との関係を示す。インバータ回路２７は、共振周波数ｆ０を有しているので、動作周波数が共振周波数ｆ０から離れるに従って放電灯出力は小さくなる。制御部２４は、放電灯２１の出力が高出力になる動作周波数ｆ１の照明光（高出力照明光）と、放電灯の出力が低出力になる動作周波数ｆ２の照明光（低出力照明光）とによって可視光信号を作成する。動作周波数ｆ１と動作周波数ｆ２は、照明光のチラツキ防止等から４０ｋＨｚから１００ｋＨｚの間に設定されるのが望ましいが、その範囲に限定されない。ここで、動作周波数１サイクルの間に放電灯２１での電流方向は１度反転するので、放電灯２１は電流方向が反転するまでに１回点灯し、電流方向が反転した後に１回点灯する。従って、照明光の周波数は動作周波数の２倍になる。   FIG. 3 shows the relationship between the operating frequency for lighting the discharge lamp 21 and the output of the discharge lamp 21. Since the inverter circuit 27 has the resonance frequency f0, the discharge lamp output decreases as the operating frequency moves away from the resonance frequency f0. The control unit 24 illuminates light with an operating frequency f1 (high output illumination light) at which the output of the discharge lamp 21 is high, and illumination light (low output illumination light) with an operating frequency f2 at which the output of the discharge lamp is low. And create a visible light signal. The operating frequency f1 and the operating frequency f2 are preferably set between 40 kHz and 100 kHz in order to prevent flickering of the illumination light, but are not limited to this range. Here, since the current direction in the discharge lamp 21 is reversed once during one cycle of the operating frequency, the discharge lamp 21 is lit once until the current direction is reversed, and is lit once after the current direction is reversed. . Therefore, the frequency of the illumination light is twice the operating frequency.

図４（ａ）は、デジタルデータ「０」及び「１」に対応する可視光信号のビットパターンを示し、図４（ｂ）は、調光レベル毎の可視光信号のビットパターンを示す。制御部２４は、「０」「１」に変換されたデジタルデータを、動作周波数ｆ１とｆ２のパルス光によるパルス位置変調により可視光信号に変調する。ここで、動作周波数ｆ１のパルス光のパルス長は一定であるが、制御部２４は、調光レベルに基づいて動作周波数ｆ２のパルス光のパルス長を変える。   4A shows the bit pattern of the visible light signal corresponding to the digital data “0” and “1”, and FIG. 4B shows the bit pattern of the visible light signal for each dimming level. The control unit 24 modulates the digital data converted into “0” and “1” into a visible light signal by pulse position modulation using pulsed light with operating frequencies f1 and f2. Here, although the pulse length of the pulsed light having the operating frequency f1 is constant, the control unit 24 changes the pulse length of the pulsed light having the operating frequency f2 based on the dimming level.

可視光信号は、１シンボルが３スロットより成っており、１つのスロットが１つのパルス光に対応する。デジタルデータの「０」は、シンボルの最初のスロットが動作周波数ｆ１に、２番目のスロットが動作周波数ｆ２に、３番目のスロットが動作周波数ｆ３に符号化される（動作周波数ｆ１→ｆ２→ｆ１に符号化されると略記、以下同様）。デジタルデータの「１」は、動作周波数ｆ１→ｆ１→ｆ２に符号化される。そして、可視光信号の先頭には、例えば動作周波数ｆ１→ｆ１→ｆ１→ｆ１→ｆ２に符号化されたスタート信号を挿入することにより、受信器３が可視光信号の先頭を認識することができるようにする。   In the visible light signal, one symbol consists of three slots, and one slot corresponds to one pulsed light. In the digital data “0”, the first slot of the symbol is encoded at the operating frequency f1, the second slot is encoded at the operating frequency f2, and the third slot is encoded at the operating frequency f3 (operating frequency f1 → f2 → f1). Abbreviated to be encoded, and so on). The digital data “1” is encoded in the operating frequency f1 → f1 → f2. Then, by inserting, for example, a start signal encoded at the operating frequency f 1 → f 1 → f 1 → f 1 → f 2 into the head of the visible light signal, the receiver 3 can recognize the head of the visible light signal. Like that.

制御部２４は、入力された調光レベルが明るい場合には動作周波数ｆ２のパルス長を短くする。これにより、放電灯２１の出力が高出力になる動作周波数ｆ１のパルス光が占める時間が多くなるので、照明が明るくなる。他方、制御部２４は、入力された調光レベルが暗い場合には動作周波数ｆ２のパルス長を長くする。これにより、放電灯２１の出力が高出力になる動作周波数ｆ１のパルス光が占める時間が少なくなるので、照明が暗くなる。制御部２４は、可視光通信を行なわずに単に照明だけを行なう場合は、動作周波数ｆ１とｆ２の間であって調光レベルに応じた動作周波数によって放電灯２１を点灯させる。制御部２４は、このようにしてデジタルデータを符号化し、可視光信号を受信器３に送信する。   When the input dimming level is bright, the control unit 24 shortens the pulse length of the operating frequency f2. As a result, the time occupied by the pulse light having the operating frequency f1 at which the output of the discharge lamp 21 is high is increased, so that the illumination is brightened. On the other hand, the control unit 24 lengthens the pulse length of the operating frequency f2 when the input dimming level is dark. Thereby, since the time which the pulse light of the operating frequency f1 used as the output of the discharge lamp 21 becomes high becomes short, illumination becomes dark. When performing only illumination without performing visible light communication, the control unit 24 turns on the discharge lamp 21 at an operating frequency between the operating frequencies f1 and f2 and according to the dimming level. In this way, the control unit 24 encodes the digital data and transmits a visible light signal to the receiver 3.

次に、可視光通信システム１の動作について説明する。照明器具２の制御部２４は、可視光通信を行なうときは、上述したように動作周波数ｆ１とｆ２のパルス光からなる可視光信号を放電灯２１から送信する。可視光信号を受信した受信器３は、光電変換部３１で電気信号に変換し、増幅部３２で増幅する。バンドパスフィルタ３３は、増幅部３２で増幅された電気信号から動作周波数ｆ２の２倍の周波数を中心周波数としてフィルタリングする。ここで、動作周波数ｆ２の２倍を中心としてフィルタリングするのは、前述したように、放電灯２１の照明光の周波数は放電灯２１を発光させる動作周波数の２倍になっており、光電変換部３１で変換された電気信号の周波数は動作周波数の２倍のままだからである。変換部３４は、フィルタリングされた電気信号の周波数を動作周波数ｆ２の２倍の周波数と比較して、動作周波数ｆ２の２倍の周波数の部分を検出する。   Next, the operation of the visible light communication system 1 will be described. When performing visible light communication, the control unit 24 of the luminaire 2 transmits a visible light signal composed of pulsed light having the operating frequencies f1 and f2 from the discharge lamp 21 as described above. The receiver 3 that has received the visible light signal is converted into an electric signal by the photoelectric conversion unit 31 and is amplified by the amplification unit 32. The band pass filter 33 filters the electric signal amplified by the amplifying unit 32 with a frequency twice the operating frequency f2 as a center frequency. Here, as described above, the filtering with the center of twice the operating frequency f2 is performed such that the illumination light frequency of the discharge lamp 21 is twice the operating frequency for causing the discharge lamp 21 to emit light, and the photoelectric conversion unit. This is because the frequency of the electrical signal converted at 31 remains twice the operating frequency. The converter 34 compares the frequency of the filtered electrical signal with a frequency twice the operating frequency f2, and detects a portion having a frequency twice the operating frequency f2.

変換部３４は、動作周波数ｆ２の２倍の周波数を検出した部分は「ｈｉｇｈ」に変換し、それ以外の部分は「ｌｏｗ」に変換する。続いて、受信器制御部３５は、制御部２４が行なったデジタルデータ「０」「１」からパルス光への変換と逆の変換を行なって、変換部３４で変換された「ｈｉｇｈ」「ｌｏｗ」の信号を「０」「１」のデータに変換する。このとき、「ｈｉｇｈ」は動作周波数ｆ２のパルス光に対応し、「ｌｏｗ」は動作周波数ｆ１のパルス光に対応する。続いて、受信器制御部３５は、「０」「１」のデータを、さらに位置情報に変換する。このようにして、受信器３は受信した可視光信号を位置情報に復調し、表示部（図示なし）等から位置情報を出力する。   The conversion unit 34 converts the portion where the frequency twice the operating frequency f2 is detected into “high”, and converts the other portion into “low”. Subsequently, the receiver control unit 35 performs conversion opposite to the conversion from the digital data “0” “1” to the pulse light performed by the control unit 24, and “high” “low” converted by the conversion unit 34. ”Signal is converted into“ 0 ”and“ 1 ”data. At this time, “high” corresponds to the pulsed light having the operating frequency f2, and “low” corresponds to the pulsed light having the operating frequency f1. Subsequently, the receiver control unit 35 further converts the data “0” and “1” into position information. In this way, the receiver 3 demodulates the received visible light signal into position information, and outputs the position information from a display unit (not shown) or the like.

この符号化方式では、「０」と「１」のどのような組み合わせによっても動作周波数ｆ２のパルス光が連続せず、また、動作周波数ｆ１のパルス長は一定であるので、受信器制御部３５は可視光信号の先頭から、各パルス光の周波数を順に把握することによりデジタルデータに変換することができる。   In this encoding method, the pulse light of the operating frequency f2 is not continuous by any combination of “0” and “1”, and the pulse length of the operating frequency f1 is constant. Can be converted into digital data by sequentially grasping the frequency of each pulsed light from the head of the visible light signal.

このとき、動作周波数ｆ１のパルス光についてはパルス長が予め決められているので、受信器制御部３５は、動作周波数ｆ１のパルス光の受信時間を計測してパルス数をカウントする。動作周波数ｆ２のパルス光は、パルス長が調光レベルに応じて増減しているが、この符号化方式では動作周波数ｆ２のパルス光は連続しないので、動作周波数ｆ１のパルス光に変わるまでのパルス数は１個である。従って、受信器制御部３５は、例えば「ｈｉｇｈ」「ｌｏｗ」に変換された信号の「立ち上がり／立ち下り」を検出することによって、動作周波数ｆ２のパルス光を認識することができる。   At this time, since the pulse length of the pulsed light with the operating frequency f1 is determined in advance, the receiver control unit 35 measures the reception time of the pulsed light with the operating frequency f1 and counts the number of pulses. Although the pulse length of the pulse light at the operating frequency f2 increases or decreases according to the dimming level, since the pulse light at the operation frequency f2 is not continuous in this encoding method, the pulse until the pulse light at the operating frequency f1 is changed. The number is one. Therefore, the receiver control unit 35 can recognize the pulsed light having the operating frequency f2 by detecting “rising / falling” of the signal converted into “high” and “low”, for example.

このように、入力された調光レベルに応じて放電灯２１の出力が低くなる動作周波数ｆ２のパルス光のパルス長を増減させ、動作周波数ｆ２のパルス光による照明時間の割合を変化させるので、可視光通信を行なっているときも調光レベルを調整することができる。また、調光レベルに応じて放電灯２１の動作周波数を変化させないので、可視光通信システム１の構成が簡単になる。また、動作周波数ｆ１のパルス光と動作周波数ｆ２のパルス光の比率が、送信データの「０」「１」の構成によらずに一定であるので、照明光のチラツキが抑制される。   In this way, the pulse length of the pulsed light at the operating frequency f2 at which the output of the discharge lamp 21 is lowered according to the input dimming level is increased or decreased, and the ratio of the illumination time by the pulsed light at the operating frequency f2 is changed. The dimming level can be adjusted even during visible light communication. Moreover, since the operating frequency of the discharge lamp 21 is not changed according to the light control level, the structure of the visible light communication system 1 becomes simple. Further, since the ratio of the pulsed light with the operating frequency f1 and the pulsed light with the operating frequency f2 is constant regardless of the configuration of transmission data “0” and “1”, flickering of illumination light is suppressed.

次に本実施形態の第１の変形例について図５（ａ）及び（ｂ）を参照して説明する。図５（ａ）は、デジタルデータ「０」及び「１」に対応する可視光信号のビットパターンを示し、図５（ｂ）は、調光レベル毎の可視光信号のビットパターンを示す。本変形例では、符号化方式が第１の実施形態の可視光通信システムと異なる。可視光信号は、１シンボルが４スロットより成っている。デジタルデータの「０」は、動作周波数ｆ１→ｆ２→ｆ１→ｆ１に符号化され、「１」は、動作周波数ｆ１→ｆ１→ｆ２→ｆ１に符号化される。また、第１の実施形態と同様に制御部２４は、入力された調光レベルが明るい場合には動作周波数ｆ２のパルス長を短くし、入力された調光レベルが暗い場合には動作周波数ｆ２のパルス長を長くする。このことにより、明るさが調整される。   Next, a first modification of the present embodiment will be described with reference to FIGS. 5 (a) and 5 (b). 5A shows the bit pattern of the visible light signal corresponding to the digital data “0” and “1”, and FIG. 5B shows the bit pattern of the visible light signal for each dimming level. In this modification, the encoding method is different from the visible light communication system of the first embodiment. In the visible light signal, one symbol consists of four slots. The digital data “0” is encoded in the operating frequency f 1 → f 2 → f 1 → f 1, and “1” is encoded in the operating frequency f 1 → f 1 → f 2 → f 1. Similarly to the first embodiment, the control unit 24 shortens the pulse length of the operating frequency f2 when the input dimming level is bright, and the operating frequency f2 when the input dimming level is dark. Increase the pulse length. This adjusts the brightness.

この方式では可視光信号の先頭に、例えば動作周波数ｆ１→ｆ１→ｆ１→ｆ１→ｆ１→ｆ２に符号化されたスタート信号を挿入、すなわち、動作周波数ｆ１のパルス光が５個続き、その後に動作周波数ｆ２のパルス光が１個続くものとすることにより、受信器制御部３５が可視光信号の先頭を認識することができる。受信器制御部３５は、このスタート信号を検出すると可視光信号の先頭と解釈し、以降順番に「０」「１」のデータに変換する。   In this method, a start signal encoded at, for example, operating frequency f1 → f1 → f1 → f1 → f1 → f2 is inserted at the head of the visible light signal, that is, five pulse lights of the operating frequency f1 continue, and then the operation starts. By assuming that one pulsed light of frequency f2 continues, the receiver control unit 35 can recognize the head of the visible light signal. When the receiver control unit 35 detects this start signal, it interprets it as the head of the visible light signal, and subsequently converts it to “0” and “1” data.

このような符号化方式にすることにより、第１の実施形態と比べて１シンボル当りのスロット数が多いので、送信するデータ数の効率が悪いが、デジタルデータのパルス数が４の倍数となるので、データ処理のソフト作成が容易になる。   By adopting such an encoding method, the number of slots per symbol is larger than in the first embodiment, so the efficiency of the number of data to be transmitted is poor, but the number of pulses of digital data is a multiple of four. Therefore, it is easy to create data processing software.

（第２の実施形態）
次に本発明の第２の実施形態に係る可視光通信システムについて図６（ａ）乃至（ｅ）及び図７を参照して説明する。図６（ａ）乃至図６（ｅ）は、デジタルデータ「００」、「０１」、「１０」、「１１」、及びスタート信号に対応する可視光信号のビットパターンを示す。本実施形態では、周波数ｆ２の照明光のパルス長を受信器３に伝えるためのトレーニング信号が可視光信号の前に挿入される。また、符号化の方式が、所謂４値ＰＰＭと呼ばれるものであり、４パルスで２ビットのデジタルデータを表す。 (Second Embodiment)
Next, a visible light communication system according to a second embodiment of the present invention will be described with reference to FIGS. 6 (a) to 6 (e) and FIG. 6A to 6E show digital data “00”, “01”, “10”, “11”, and a bit pattern of a visible light signal corresponding to the start signal. In the present embodiment, a training signal for transmitting the pulse length of the illumination light having the frequency f2 to the receiver 3 is inserted before the visible light signal. The encoding method is so-called 4-level PPM, which represents 2-bit digital data with 4 pulses.

可視光信号は、１シンボルが４スロットより成っている。デジタルデータの「００」は動作周波数ｆ２→ｆ１→ｆ１→ｆ１に符号化され、「０１」は動作周波数ｆ１→ｆ２→ｆ１→ｆ１に符号化され、「１０」は動作周波数ｆ１→ｆ１→ｆ２→ｆ１に符号化され、「１１」は動作周波数ｆ１→ｆ１→ｆ１→ｆ２に符号化される。   In the visible light signal, one symbol consists of four slots. “00” of the digital data is encoded in the operating frequency f 2 → f 1 → f 1 → f 1, “01” is encoded in the operating frequency f 1 → f 2 → f 1 → f 1, and “10” is the operating frequency f 1 → f 1 → f 2. → encoded as f1, and “11” is encoded as operating frequency f1 → f1 → f1 → f2.

また、図６（ｅ）に示されるスタート信号が可視光信号の先頭に挿入される。デジタルデータのビットパターンが上述した実施形態でのビットパターンと異なるので、上述した実施形態のスタート信号のビットパターンでは、可視光信号の先頭を認識することができない。そこで、スタート信号も本実施形態でのデジタルデータのビットパターンに対応させて、動作周波数ｆ１→ｆ１→ｆ１→ｆ１→ｆ２→ｆ１→ｆ２→ｆ１に符号化する。このスタート信号は動作周波数ｆ２のパルス長を受信器制御部３５に伝達するためのトレーニング信号を含んでおり、制御部２４は入力された調光レベルに応じてスタート信号中の動作周波数ｆ２のパルス長を変える。可視光信号を受信した受信器３の受信器制御部３５は、スタート信号中の動作周波数ｆ２のパルス長を測定し、そのパルス長を記憶する。受信器制御部３５は、動作周波数ｆ２のパルス光を受信すると、記憶したパルス長に基づいて動作周波数ｆ２のパルス光のパルス数をカウントする。これにより、デジタルデータの「１１」に「００」が続いて動作周波数ｆ２のパルス光が連続してもパルス数をカウントすることができる。   Further, the start signal shown in FIG. 6E is inserted at the head of the visible light signal. Since the bit pattern of the digital data is different from the bit pattern in the above embodiment, the start signal bit pattern in the above embodiment cannot recognize the head of the visible light signal. Therefore, the start signal is also encoded in the operation frequency f1 → f1 → f1 → f1 → f2 → f1 → f2 → f1 corresponding to the bit pattern of the digital data in this embodiment. This start signal includes a training signal for transmitting the pulse length of the operating frequency f2 to the receiver control unit 35, and the control unit 24 determines the pulse of the operating frequency f2 in the start signal according to the input dimming level. Change the length. The receiver control unit 35 of the receiver 3 that has received the visible light signal measures the pulse length of the operating frequency f2 in the start signal and stores the pulse length. When receiving the pulsed light with the operating frequency f2, the receiver control unit 35 counts the number of pulses of the pulsed light with the operating frequency f2 based on the stored pulse length. As a result, the number of pulses can be counted even if “00” follows the digital data “11” and pulse light of the operating frequency f2 continues.

このように、スタート信号が動作周波数ｆ２の照明光のパルス長を受信器に伝えるためのトレーニング信号を有しているので、可視光信号に動作周波数ｆ２のパルス光が連続するビットパターンを用いることができる。これにより、本実施形態のように４パルスで２ビットのデジタルデータを表すことができるので、動作周波数ｆ２のパルス光が連続しないビットパターンを用いる場合と比べデータを多く伝送することができる。   As described above, since the start signal has the training signal for transmitting the pulse length of the illumination light having the operating frequency f2 to the receiver, a bit pattern in which the pulse light having the operating frequency f2 is continuous with the visible light signal is used. Can do. As a result, 2-bit digital data can be represented by 4 pulses as in the present embodiment, so that a larger amount of data can be transmitted compared to the case where a bit pattern in which pulsed light of the operating frequency f2 is not continuous is used.

図７は、調光レベル毎の可視光信号のビットパターンを示す。制御部２４は、第１の実施形態と同様に、入力された調光レベルが明るい場合には動作周波数ｆ２のパルス長を短くし、入力された調光レベルが暗い場合には動作周波数ｆ２のパルス長を長くする。これにより、入力された調光レベルに応じて明るさを調整することができる。   FIG. 7 shows a bit pattern of a visible light signal for each dimming level. As in the first embodiment, the control unit 24 shortens the pulse length of the operating frequency f2 when the input dimming level is bright, and reduces the operating frequency f2 when the input dimming level is dark. Increase the pulse length. Thereby, brightness can be adjusted according to the input light control level.

次に、本実施形態の第１の変形例について図８（ａ）及び（ｂ）を参照して説明する。本変形例は、符号化の方式が異なる。図８（ａ）は、デジタルデータ「０」、「１」及びスタート信号に対応する可視光信号のビットパターンを示し、図８（ｂ）は、調光レベル毎の可視光信号のビットパターンを示す。   Next, a first modification of the present embodiment will be described with reference to FIGS. 8 (a) and 8 (b). This modification is different in the encoding method. 8A shows the bit pattern of the visible light signal corresponding to the digital data “0”, “1” and the start signal, and FIG. 8B shows the bit pattern of the visible light signal for each dimming level. Show.

可視光信号は、１シンボルが４スロットより成っている。デジタルデータの「０」は、動作周波数ｆ１→ｆ２→ｆ１→ｆ２に符号化され、「１」は動作周波数ｆ１→ｆ２→ｆ２→ｆ１に符号化される。スタート信号は、本実施形態でのデジタルデータのビットパターンに対応させて動作周波数ｆ１→ｆ１→ｆ１→ｆ１→ｆ２→ｆ１→ｆ２→ｆ１に符号化され、このスタート信号は動作周波数ｆ２のパルス長を受信器制御部３５に伝達するためのトレーニング信号を含んでいる。制御部２４は、第１の実施形態と同様に入力された調光レベルが明るい場合には動作周波数ｆ２のパルス長を短くし、入力された調光レベルが暗い場合には動作周波数ｆ２のパルス長を長くする。このことにより、明るさが調整される。   In the visible light signal, one symbol consists of four slots. The digital data “0” is encoded in the operating frequency f 1 → f 2 → f 1 → f 2, and “1” is encoded in the operating frequency f 1 → f 2 → f 2 → f 1. The start signal is encoded in the operation frequency f1 → f1 → f1 → f1 → f2 → f1 → f2 → f1 corresponding to the bit pattern of the digital data in the present embodiment, and this start signal has a pulse length of the operation frequency f2. Is transmitted to the receiver control unit 35. As in the first embodiment, the control unit 24 shortens the pulse length of the operating frequency f2 when the input dimming level is bright, and shortens the pulse of the operating frequency f2 when the input dimming level is dark. Increase the length. This adjusts the brightness.

この符号化では１シンボル当りのスロット数が多いので、送信することのできるデータ数の効率が悪いが、デジタルデータのパルス数が４の倍数となるので、データ処理のソフト作成が容易になる。   In this encoding, since the number of slots per symbol is large, the efficiency of the number of data that can be transmitted is poor. However, since the number of pulses of digital data is a multiple of 4, it is easy to create software for data processing.

次に、本実施形態の第２の変形例について図９（ａ）及び（ｂ）を参照して説明する。本変形例は、符号化の方式が異なる。図９（ａ）は、デジタルデータ「０」、「１」及びスタート信号に対応する可視光信号のビットパターンを示し、図９（ｂ）は、調光レベル毎の可視光信号のビットパターンを示す。可視光信号は、１シンボルが２スロットより成っている。デジタルデータの「０」は、動作周波数ｆ１→ｆ２に符号化され、「１」は動作周波数ｆ２→ｆ１に符号化される。所謂マンチェスター符号と呼ばれる方式である。スタート信号は、本実施形態でのデジタルデータのビットパターンに対応させて動作周波数ｆ１→ｆ１→ｆ１→ｆ２→ｆ１→ｆ２→ｆ１→ｆ１に符号化され、このスタート信号は動作周波数ｆ２のパルス長を受信器制御部３５に伝達するためのトレーニング信号を含んでいる。制御部２４は、第１の実施形態と同様に入力された調光レベルが明るい場合には動作周波数ｆ２のパルス長を短くし、入力された調光レベルが暗い場合には動作周波数ｆ２のパルス長を長くする。このことにより、明るさが調整される。   Next, a second modification of the present embodiment will be described with reference to FIGS. 9 (a) and 9 (b). This modification is different in the encoding method. FIG. 9A shows the bit pattern of the visible light signal corresponding to the digital data “0” and “1” and the start signal, and FIG. 9B shows the bit pattern of the visible light signal for each dimming level. Show. In the visible light signal, one symbol consists of two slots. “0” of the digital data is encoded from the operating frequency f1 → f2, and “1” is encoded from the operating frequency f2 → f1. This is a so-called Manchester code. The start signal is encoded in the operation frequency f1 → f1 → f1 → f2 → f1 → f2 → f1 → f1 corresponding to the bit pattern of the digital data in this embodiment, and the start signal has a pulse length of the operation frequency f2. Is transmitted to the receiver control unit 35. As in the first embodiment, the control unit 24 shortens the pulse length of the operating frequency f2 when the input dimming level is bright, and shortens the pulse of the operating frequency f2 when the input dimming level is dark. Increase the length. This adjusts the brightness.

この符号化により、２パルスで１ビットのデジタルデータを表すことができるので、データを多く伝送することができる。   By this encoding, 1-bit digital data can be represented by 2 pulses, so that a large amount of data can be transmitted.

次に、本実施形態の第３の変形例について図１０（ａ）及び（ｂ）を参照して説明する。本変形例は、符号化の方式が異なる。図１０（ａ）は、デジタルデータ「０」、「１」及びスタート信号に対応する可視光信号のビットパターンを示し、図１０（ｂ）は、調光レベル毎の可視光信号のビットパターンを示す。可視光信号は、１シンボルが２スロットより成っている。デジタルデータの「０」は、動作周波数ｆ２→ｆ１に符号化される。デジタルデータの「１」は動作周波数ｆ１→ｆ１又は動作周波数ｆ２→ｆ２であって、「０」に続くときは動作周波数ｆ１→ｆ１に符号化され、「１」に続くときは前の「１」が動作周波数ｆ１→ｆ１なら動作周波数ｆ２→ｆ２に符号化され、前の「１」が動作周波数ｆ２→ｆ２なら動作周波数ｆ１→ｆ１に符号化される。所謂ＣＭＩ符号と呼ばれる方式である。   Next, a third modification of the present embodiment will be described with reference to FIGS. 10 (a) and 10 (b). This modification is different in the encoding method. 10A shows the bit pattern of the visible light signal corresponding to the digital data “0” and “1” and the start signal, and FIG. 10B shows the bit pattern of the visible light signal for each dimming level. Show. In the visible light signal, one symbol consists of two slots. “0” of the digital data is encoded to the operating frequency f2 → f1. “1” of the digital data is the operating frequency f1 → f1 or the operating frequency f2 → f2, and when “0” is followed, it is encoded to the operating frequency f1 → f1, and when “1” is followed, the previous “1” is encoded. Is encoded in the operating frequency f2 → f2, and if the previous “1” is the operating frequency f2 → f2, it is encoded in the operating frequency f1 → f1. This is a so-called CMI code.

スタート信号は、本実施形態でのデジタルデータのビットパターンに対応させて動作周波数ｆ１→ｆ１→ｆ１→ｆ１→ｆ１→ｆ２→ｆ１→ｆ２に符号化され、このスタート信号は動作周波数ｆ２のパルス長を受信器制御部３５に伝達するためのトレーニング信号を含んでいる。制御部２４は、第１の実施形態と同様に入力された調光レベルが明るい場合には動作周波数ｆ２のパルス長を短くし、入力された調光レベルが暗い場合には動作周波数ｆ２のパルス長を長くする。このことにより、明るさが調整される。   The start signal is encoded in the operation frequency f1 → f1 → f1 → f1 → f1 → f2 → f1 → f2 corresponding to the bit pattern of the digital data in the present embodiment, and this start signal has a pulse length of the operation frequency f2. Is transmitted to the receiver control unit 35. As in the first embodiment, the control unit 24 shortens the pulse length of the operating frequency f2 when the input dimming level is bright, and shortens the pulse of the operating frequency f2 when the input dimming level is dark. Increase the length. This adjusts the brightness.

この符号化によっても、２パルスで１ビットのデジタルデータを表すことができるので、データを多く伝送することができる。   Also by this encoding, 1-bit digital data can be represented by 2 pulses, so that a large amount of data can be transmitted.

なお、本発明は、上記各種実施形態の構成に限られず、発明の趣旨を変更しない範囲で種々の変形が可能である。例えば、位置情報には、現在地の近傍の店舗情報等を含めてもよい。これにより可視光通信システムの利便性が向上する。また、上述した実施形態では、放電灯の出力が低出力になる動作周波数ｆ２の照明光のパルス長を調光レベルに応じて増減したが、放電灯の出力が高出力になる動作周波数ｆ１の照明光のパルス長を調光レベルに応じて増減してもよく、同様の効果を得ることができる。   In addition, this invention is not restricted to the structure of the said various embodiment, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, the location information may include store information in the vicinity of the current location. This improves the convenience of the visible light communication system. In the above-described embodiment, the pulse length of the illumination light at the operating frequency f2 at which the output of the discharge lamp becomes low is increased or decreased according to the dimming level, but at the operating frequency f1 at which the output of the discharge lamp becomes high. The pulse length of the illumination light may be increased or decreased according to the dimming level, and the same effect can be obtained.

本発明の第１の実施形態に係る可視光通信システムの構成図。1 is a configuration diagram of a visible light communication system according to a first embodiment of the present invention. 同可視光通信システムにおける照明器具の回路図。The circuit diagram of the lighting fixture in the visible light communication system. 同可視光通信システムにおける放電灯を点灯させる動作周波数と放電灯出力の関係を示す図。The figure which shows the relationship between the operating frequency and discharge lamp output which light a discharge lamp in the visible light communication system. （ａ）は同可視光通信システムにおけるデジタルデータ「０」及び「１」に対応するビットパターンを示す図、（ｂ）は調光レベル毎の可視光信号のビットパターンを示す図。(A) is a figure which shows the bit pattern corresponding to digital data "0" and "1" in the visible light communication system, (b) is a figure which shows the bit pattern of the visible light signal for every light control level. （ａ）は同可視光通信システムの変形例におけるデジタルデータ「０」及び「１」に対応するビットパターンを示す図、（ｂ）は調光レベル毎の可視光信号のビットパターンを示す図。(A) is a figure which shows the bit pattern corresponding to digital data "0" and "1" in the modification of the visible light communication system, (b) is a figure which shows the bit pattern of the visible light signal for every light control level. （ａ）乃至（ｄ）は本発明の第２の実施形態に係る可視光通信システムにおけるデジタルデータ「００」、「０１」、「１０」、及び「１１」に対応するビットパターンを示す図、（ｅ）はスタート信号のビットパターンを示す図。FIGS. 5A to 5D are diagrams showing bit patterns corresponding to digital data “00”, “01”, “10”, and “11” in the visible light communication system according to the second embodiment of the present invention; (E) is a figure which shows the bit pattern of a start signal. （ａ）は同可視光通信システムにおける調光レベル毎の可視光信号のビットパターンを示す図。(A) is a figure which shows the bit pattern of the visible light signal for every light control level in the visible light communication system. （ａ）は同可視光通信システムの第１の変形例におけるデジタルデータ「０」、「１」及びスタート信号に対応するビットパターンを示す図、（ｂ）は調光レベル毎の可視光信号のビットパターンを示す図。(A) is a figure which shows the bit pattern corresponding to digital data "0", "1" and a start signal in the 1st modification of the visible light communication system, (b) is the visible light signal for every light control level. The figure which shows a bit pattern. （ａ）は同可視光通信システムの第２の変形例におけるデジタルデータ「０」、「１」及びスタート信号に対応するビットパターンを示す図、（ｂ）は調光レベル毎の可視光信号のビットパターンを示す図。(A) is a figure which shows the bit pattern corresponding to digital data "0", "1" and a start signal in the 2nd modification of the visible light communication system, (b) is the visible light signal for every light control level. The figure which shows a bit pattern. （ａ）は同可視光通信システムの第１の変形例におけるデジタルデータ「０」、「１」及びスタート信号に対応するビットパターンを示す図、（ｂ）は調光レベル毎の可視光信号のビットパターンを示す図。(A) is a figure which shows the bit pattern corresponding to digital data "0", "1" and a start signal in the 1st modification of the visible light communication system, (b) is the visible light signal for every light control level. The figure which shows a bit pattern.

符号の説明Explanation of symbols

１ 可視光通信システム
２ 照明器具（送信器）
２１ 放電灯
２２ 調光入力部
２３ 信号源
２４ 制御部
２５ 点灯回路
３ 受信器 1 Visible light communication system 2 Lighting equipment (transmitter)
21 discharge lamp 22 dimming input unit 23 signal source 24 control unit 25 lighting circuit 3 receiver

Claims (2)

放電灯を光源とし、該光源からの光をパルス位置変調により変調した可視光信号を可視光通信により送信する送信器と、前記送信器から送信された可視光信号を復調する受信器と、を備えた可視光通信システムにおいて、
前記送信器は、
前記放電灯の調光レベルを入力される調光入力部と、
送信する送信データを作成する信号源と、
前記調光入力部に入力された調光レベルと前記信号源によって作成された送信データとに基づいて前記可視光信号を制御する制御信号を作成する制御部と、
前記制御部によって作成された前記制御信号に基づいて前記放電灯を点灯させる点灯回路と、を備え、
前記可視光信号は、前記放電灯の出力が高出力である高出力照明光からなるパルス光と、前記放電灯の出力が低出力である低出力照明光からなるパルス光とを含み、パルス位置変調により変調され、
前記制御部は、入力された調光レベルに応じて前記可視光信号のうちの前記高出力照明光、又は低出力照明光のパルス長を増減することを特徴とする可視光通信システム。 A transmitter that uses a discharge lamp as a light source and transmits a visible light signal obtained by modulating light from the light source by pulse position modulation through visible light communication, and a receiver that demodulates the visible light signal transmitted from the transmitter. In the visible light communication system provided,
The transmitter is
A dimming input unit for inputting the dimming level of the discharge lamp;
A signal source for creating transmission data to be transmitted;
A control unit that creates a control signal for controlling the visible light signal based on a dimming level input to the dimming input unit and transmission data created by the signal source;
A lighting circuit for lighting the discharge lamp based on the control signal created by the control unit,
The visible light signal includes pulsed light composed of high-power illumination light with a high output of the discharge lamp and pulsed light composed of low-power illumination light with a low output of the discharge lamp, and a pulse position Modulated by modulation,
The said control part increases / decreases the pulse length of the said high output illumination light of the said visible light signals or the low output illumination light according to the input light control level, The visible light communication system characterized by the above-mentioned. 前記制御部は、前記高出力照明光、又は低出力照明光のパルス長を前記受信器に伝えるためのトレーニング信号を前記可視光信号の前に挿入することを特徴とする請求項１に記載の可視光通信システム。   The said control part inserts the training signal for transmitting the pulse length of the said high output illumination light or the low output illumination light to the said receiver before the said visible light signal. Visible light communication system.
JP2008138600A 2008-05-27 2008-05-27 Visible light communication system Expired - Fee Related JP5171393B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008138600A JP5171393B2 (en) 2008-05-27 2008-05-27 Visible light communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008138600A JP5171393B2 (en) 2008-05-27 2008-05-27 Visible light communication system

Publications (2)

Publication Number Publication Date
JP2009290359A true JP2009290359A (en) 2009-12-10
JP5171393B2 JP5171393B2 (en) 2013-03-27

Family

ID=41459175

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2008138600A Expired - Fee Related JP5171393B2 (en) 2008-05-27 2008-05-27 Visible light communication system

Country Status (1)

Country Link
JP (1) JP5171393B2 (en)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011149254A2 (en) * 2010-05-25 2011-12-01 영남대학교 산학협력단 Transmitter for wireless optical communication system using light source
CN102332952A (en) * 2010-06-02 2012-01-25 索尼公司 Transmission device, transmission method, reception device, reception method, communication system, and communication method
KR101181494B1 (en) 2010-05-25 2012-09-11 영남대학교 산학협력단 Transmitter of wireless light communication system using light source
CN103188838A (en) * 2011-08-06 2013-07-03 深圳光启高等理工研究院 LED illumination system for achieving wireless communication
US9077456B2 (en) 2012-04-03 2015-07-07 Panasonic Intellectual Property Management Co., Ltd. Visible light receiving device and visible light receiving method
CN104956608A (en) * 2012-12-27 2015-09-30 松下电器（美国）知识产权公司 Information communication method
US9247180B2 (en) 2012-12-27 2016-01-26 Panasonic Intellectual Property Corporation Of America Video display method using visible light communication image including stripe patterns having different pitches
US9252878B2 (en) 2012-12-27 2016-02-02 Panasonic Intellectual Property Corporation Of America Information communication method
US9258058B2 (en) 2012-12-27 2016-02-09 Panasonic Intellectual Property Corporation Of America Signal transmitting apparatus for transmitting information by bright line pattern in image
US9262954B2 (en) 2012-12-27 2016-02-16 Panasonic Intellectual Property Corporation Of America Visible light communication signal display method and apparatus
US9281895B2 (en) 2012-12-27 2016-03-08 Panasonic Intellectual Property Corporation Of America Information communication method
US9300845B2 (en) 2012-05-24 2016-03-29 Panasonic Intellectual Property Corporation Of America Information communication device for obtaining information from a subject by demodulating a bright line pattern included in an obtained image
US9331779B2 (en) 2012-12-27 2016-05-03 Panasonic Intellectual Property Corporation Of America Information communication method for obtaining information using ID list and bright line image
US9341014B2 (en) 2012-12-27 2016-05-17 Panasonic Intellectual Property Corporation Of America Information communication method using change in luminance
US9462173B2 (en) 2012-12-27 2016-10-04 Panasonic Intellectual Property Corporation Of America Information communication method
US9560284B2 (en) 2012-12-27 2017-01-31 Panasonic Intellectual Property Corporation Of America Information communication method for obtaining information specified by striped pattern of bright lines
US9591232B2 (en) 2012-12-27 2017-03-07 Panasonic Intellectual Property Corporation Of America Information communication method
US9608725B2 (en) 2012-12-27 2017-03-28 Panasonic Intellectual Property Corporation Of America Information processing program, reception program, and information processing apparatus
US9608727B2 (en) 2012-12-27 2017-03-28 Panasonic Intellectual Property Corporation Of America Switched pixel visible light transmitting method, apparatus and program
US9646568B2 (en) 2012-12-27 2017-05-09 Panasonic Intellectual Property Corporation Of America Display method
US9871587B2 (en) 2013-11-22 2018-01-16 Panasonic Intellectual Property Corporation Of America Information processing method for generating encoded signal for visible light communication
WO2018146778A1 (en) 2017-02-09 2018-08-16 富士通株式会社 Transmission device, transmission control device, communication system, transmission method and computer program for transmission
US10142020B2 (en) 2014-11-14 2018-11-27 Panasonic Intellectual Property Corporation Of America Reproduction method for reproducing contents
US10303945B2 (en) 2012-12-27 2019-05-28 Panasonic Intellectual Property Corporation Of America Display method and display apparatus
JP2019515831A (en) * 2016-04-19 2019-06-13 ボイス パテント ゲーエムベーハーＶｏｉｔｈ Ｐａｔｅｎｔ ＧｍｂＨ Device for data and / or signal transmission
US10523876B2 (en) 2012-12-27 2019-12-31 Panasonic Intellectual Property Corporation Of America Information communication method
US10530486B2 (en) 2012-12-27 2020-01-07 Panasonic Intellectual Property Corporation Of America Transmitting method, transmitting apparatus, and program
US10951310B2 (en) 2012-12-27 2021-03-16 Panasonic Intellectual Property Corporation Of America Communication method, communication device, and transmitter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006237869A (en) * 2005-02-23 2006-09-07 Matsushita Electric Works Ltd Illumination light transmission system
JP2006325085A (en) * 2005-05-20 2006-11-30 Nakagawa Kenkyusho:Kk Data transmitter and data receiver
JP2007043592A (en) * 2005-08-05 2007-02-15 Taiyo Yuden Co Ltd Transmitter and receiver for optical communication, optical communication system, and communication device
JP2007097071A (en) * 2005-09-30 2007-04-12 Nec Corp Visible light controller, visible light control circuit, visible light communication equipment and visible light control method
JP2008104020A (en) * 2006-10-19 2008-05-01 Matsushita Electric Works Ltd Light transmission system
JP2009117892A (en) * 2007-11-01 2009-05-28 Toshiba Corp Visible light communication apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006237869A (en) * 2005-02-23 2006-09-07 Matsushita Electric Works Ltd Illumination light transmission system
JP2006325085A (en) * 2005-05-20 2006-11-30 Nakagawa Kenkyusho:Kk Data transmitter and data receiver
JP2007043592A (en) * 2005-08-05 2007-02-15 Taiyo Yuden Co Ltd Transmitter and receiver for optical communication, optical communication system, and communication device
JP2007097071A (en) * 2005-09-30 2007-04-12 Nec Corp Visible light controller, visible light control circuit, visible light communication equipment and visible light control method
JP2008104020A (en) * 2006-10-19 2008-05-01 Matsushita Electric Works Ltd Light transmission system
JP2009117892A (en) * 2007-11-01 2009-05-28 Toshiba Corp Visible light communication apparatus

Cited By (78)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011149254A3 (en) * 2010-05-25 2012-02-23 영남대학교 산학협력단 Transmitter for wireless optical communication system using light source
KR101181494B1 (en) 2010-05-25 2012-09-11 영남대학교 산학협력단 Transmitter of wireless light communication system using light source
US8948600B2 (en) 2010-05-25 2015-02-03 Industry-Academic Cooperation Foundation, Yeungnam University Transmitter for wireless optical communication system using light source
WO2011149254A2 (en) * 2010-05-25 2011-12-01 영남대학교 산학협력단 Transmitter for wireless optical communication system using light source
CN102332952A (en) * 2010-06-02 2012-01-25 索尼公司 Transmission device, transmission method, reception device, reception method, communication system, and communication method
CN103188838A (en) * 2011-08-06 2013-07-03 深圳光启高等理工研究院 LED illumination system for achieving wireless communication
US9077456B2 (en) 2012-04-03 2015-07-07 Panasonic Intellectual Property Management Co., Ltd. Visible light receiving device and visible light receiving method
US9300845B2 (en) 2012-05-24 2016-03-29 Panasonic Intellectual Property Corporation Of America Information communication device for obtaining information from a subject by demodulating a bright line pattern included in an obtained image
US9456109B2 (en) 2012-05-24 2016-09-27 Panasonic Intellectual Property Corporation Of America Information communication method of obtaining information from a subject by demodulating data specified by a pattern of a bright line included in an obtained image
US10218914B2 (en) 2012-12-20 2019-02-26 Panasonic Intellectual Property Corporation Of America Information communication apparatus, method and recording medium using switchable normal mode and visible light communication mode
CN104956608B (en) * 2012-12-27 2018-01-26 松下电器（美国）知识产权公司 Information communicating method
US10455161B2 (en) 2012-12-27 2019-10-22 Panasonic Intellectual Property Corporation Of America Information communication method
US9262954B2 (en) 2012-12-27 2016-02-16 Panasonic Intellectual Property Corporation Of America Visible light communication signal display method and apparatus
US9281895B2 (en) 2012-12-27 2016-03-08 Panasonic Intellectual Property Corporation Of America Information communication method
US9252878B2 (en) 2012-12-27 2016-02-02 Panasonic Intellectual Property Corporation Of America Information communication method
US9331779B2 (en) 2012-12-27 2016-05-03 Panasonic Intellectual Property Corporation Of America Information communication method for obtaining information using ID list and bright line image
US9341014B2 (en) 2012-12-27 2016-05-17 Panasonic Intellectual Property Corporation Of America Information communication method using change in luminance
US9380227B2 (en) 2012-12-27 2016-06-28 Panasonic Intellectual Property Corporation Of America Information communication method for obtaining information using bright line image
US9407368B2 (en) 2012-12-27 2016-08-02 Panasonic Intellectual Property Corporation Of America Information communication method
US9450672B2 (en) 2012-12-27 2016-09-20 Panasonic Intellectual Property Corporation Of America Information communication method of transmitting a signal using change in luminance
US9247180B2 (en) 2012-12-27 2016-01-26 Panasonic Intellectual Property Corporation Of America Video display method using visible light communication image including stripe patterns having different pitches
US9462173B2 (en) 2012-12-27 2016-10-04 Panasonic Intellectual Property Corporation Of America Information communication method
US9467225B2 (en) 2012-12-27 2016-10-11 Panasonic Intellectual Property Corporation Of America Information communication method
US9515731B2 (en) 2012-12-27 2016-12-06 Panasonic Intellectual Property Corporation Of America Information communication method
US9560284B2 (en) 2012-12-27 2017-01-31 Panasonic Intellectual Property Corporation Of America Information communication method for obtaining information specified by striped pattern of bright lines
US9564970B2 (en) 2012-12-27 2017-02-07 Panasonic Intellectual Property Corporation Of America Information communication method for obtaining information using ID list and bright line image
US9571191B2 (en) 2012-12-27 2017-02-14 Panasonic Intellectual Property Corporation Of America Information communication method
US9591232B2 (en) 2012-12-27 2017-03-07 Panasonic Intellectual Property Corporation Of America Information communication method
US9608725B2 (en) 2012-12-27 2017-03-28 Panasonic Intellectual Property Corporation Of America Information processing program, reception program, and information processing apparatus
US9608727B2 (en) 2012-12-27 2017-03-28 Panasonic Intellectual Property Corporation Of America Switched pixel visible light transmitting method, apparatus and program
US9613596B2 (en) 2012-12-27 2017-04-04 Panasonic Intellectual Property Corporation Of America Video display method using visible light communication image including stripe patterns having different pitches
US9635278B2 (en) 2012-12-27 2017-04-25 Panasonic Intellectual Property Corporation Of America Information communication method for obtaining information specified by striped pattern of bright lines
US9641766B2 (en) 2012-12-27 2017-05-02 Panasonic Intellectual Property Corporation Of America Information communication method
US9646568B2 (en) 2012-12-27 2017-05-09 Panasonic Intellectual Property Corporation Of America Display method
US9756255B2 (en) 2012-12-27 2017-09-05 Panasonic Intellectual Property Corporation Of America Information communication method
US9768869B2 (en) 2012-12-27 2017-09-19 Panasonic Intellectual Property Corporation Of America Information communication method
US9794489B2 (en) 2012-12-27 2017-10-17 Panasonic Intellectual Property Corporation Of America Information communication method
US9859980B2 (en) 2012-12-27 2018-01-02 Panasonic Intellectual Property Corporation Of America Information processing program, reception program, and information processing apparatus
US12088923B2 (en) 2012-12-27 2024-09-10 Panasonic Intellectual Property Corporation Of America Information communication method
EP2940894A4 (en) * 2012-12-27 2015-12-23 Panasonic Ip Corp America Information communication method
US9918016B2 (en) 2012-12-27 2018-03-13 Panasonic Intellectual Property Corporation Of America Information communication apparatus, method, and recording medium using switchable normal mode and visible light communication mode
US9998220B2 (en) 2012-12-27 2018-06-12 Panasonic Intellectual Property Corporation Of America Transmitting method, transmitting apparatus, and program
US10051194B2 (en) 2012-12-27 2018-08-14 Panasonic Intellectual Property Corporation Of America Information communication method
US11659284B2 (en) 2012-12-27 2023-05-23 Panasonic Intellectual Property Corporation Of America Information communication method
US11490025B2 (en) 2012-12-27 2022-11-01 Panasonic Intellectual Property Corporation Of America Information communication method
US10148354B2 (en) 2012-12-27 2018-12-04 Panasonic Intellectual Property Corporation Of America Luminance change information communication method
US10165192B2 (en) 2012-12-27 2018-12-25 Panasonic Intellectual Property Corporation Of America Information communication method
US10205887B2 (en) 2012-12-27 2019-02-12 Panasonic Intellectual Property Corporation Of America Information communication method
CN104956608A (en) * 2012-12-27 2015-09-30 松下电器（美国）知识产权公司 Information communication method
US10225014B2 (en) 2012-12-27 2019-03-05 Panasonic Intellectual Property Corporation Of America Information communication method for obtaining information using ID list and bright line image
US10303945B2 (en) 2012-12-27 2019-05-28 Panasonic Intellectual Property Corporation Of America Display method and display apparatus
US11165967B2 (en) 2012-12-27 2021-11-02 Panasonic Intellectual Property Corporation Of America Information communication method
US10334177B2 (en) 2012-12-27 2019-06-25 Panasonic Intellectual Property Corporation Of America Information communication apparatus, method, and recording medium using switchable normal mode and visible light communication mode
US10354599B2 (en) 2012-12-27 2019-07-16 Panasonic Intellectual Property Corporation Of America Display method
US10361780B2 (en) 2012-12-27 2019-07-23 Panasonic Intellectual Property Corporation Of America Information processing program, reception program, and information processing apparatus
US10368006B2 (en) 2012-12-27 2019-07-30 Panasonic Intellectual Property Corporation Of America Information communication method
US10368005B2 (en) 2012-12-27 2019-07-30 Panasonic Intellectual Property Corporation Of America Information communication method
US10951310B2 (en) 2012-12-27 2021-03-16 Panasonic Intellectual Property Corporation Of America Communication method, communication device, and transmitter
US10447390B2 (en) 2012-12-27 2019-10-15 Panasonic Intellectual Property Corporation Of America Luminance change information communication method
US9258058B2 (en) 2012-12-27 2016-02-09 Panasonic Intellectual Property Corporation Of America Signal transmitting apparatus for transmitting information by bright line pattern in image
US10516832B2 (en) 2012-12-27 2019-12-24 Panasonic Intellectual Property Corporation Of America Information communication method
US10523876B2 (en) 2012-12-27 2019-12-31 Panasonic Intellectual Property Corporation Of America Information communication method
US10521668B2 (en) 2012-12-27 2019-12-31 Panasonic Intellectual Property Corporation Of America Display method and display apparatus
US10531010B2 (en) 2012-12-27 2020-01-07 Panasonic Intellectual Property Corporation Of America Information communication method
US10531009B2 (en) 2012-12-27 2020-01-07 Panasonic Intellectual Property Corporation Of America Information communication method
US10530486B2 (en) 2012-12-27 2020-01-07 Panasonic Intellectual Property Corporation Of America Transmitting method, transmitting apparatus, and program
US10616496B2 (en) 2012-12-27 2020-04-07 Panasonic Intellectual Property Corporation Of America Information communication method
US10638051B2 (en) 2012-12-27 2020-04-28 Panasonic Intellectual Property Corporation Of America Information communication method
US10666871B2 (en) 2012-12-27 2020-05-26 Panasonic Intellectual Property Corporation Of America Information communication method
US10742891B2 (en) 2012-12-27 2020-08-11 Panasonic Intellectual Property Corporation Of America Information communication method
US10887528B2 (en) 2012-12-27 2021-01-05 Panasonic Intellectual Property Corporation Of America Information communication method
US9871587B2 (en) 2013-11-22 2018-01-16 Panasonic Intellectual Property Corporation Of America Information processing method for generating encoded signal for visible light communication
US10389446B2 (en) 2014-11-14 2019-08-20 Panasonic Intellectual Property Corporation Of America Reproduction method for reproducing contents
US10142020B2 (en) 2014-11-14 2018-11-27 Panasonic Intellectual Property Corporation Of America Reproduction method for reproducing contents
US10752268B2 (en) 2016-04-19 2020-08-25 Voith Patent Gmbh Device for data and/or signal transmission
JP2019515831A (en) * 2016-04-19 2019-06-13 ボイス パテント ゲーエムベーハーＶｏｉｔｈ Ｐａｔｅｎｔ ＧｍｂＨ Device for data and / or signal transmission
US10951312B2 (en) 2017-02-09 2021-03-16 Fujitsu Limited Transmitting device, transmission control device, and transmission method
WO2018146778A1 (en) 2017-02-09 2018-08-16 富士通株式会社 Transmission device, transmission control device, communication system, transmission method and computer program for transmission

Also Published As

Publication number Publication date
JP5171393B2 (en) 2013-03-27

Similar Documents

Publication Publication Date Title
JP5171393B2 (en) Visible light communication system
JP4506502B2 (en) Illumination light transmission system
JP5891393B2 (en) Illumination light communication apparatus, lighting apparatus using the same, and illumination system
JP5354995B2 (en) Visible light communication system
JP5906408B2 (en) Illumination light communication apparatus, lighting apparatus using the same, and illumination system
JP6058636B2 (en) Lighting device and receiver
EP2727228B1 (en) Transformer-isolated led lighting circuit with secondary-side dimming control
US9942954B2 (en) Method and system for controlling solid state lighting via dithering
JP2010232912A (en) Illumination light transmission system
JP2007267037A (en) Illumination light transmission system
US9935711B2 (en) Method and system for optical communication
JP5000327B2 (en) Visible light communication system
JP2006278059A (en) Illumination system
JP2009290361A (en) Visible light communication system
JP2008206086A (en) Visible optical communication system
CN1802880B (en) Light output modulation for data transmission
JP4661763B2 (en) Optical transmission system
JP4894320B2 (en) Illumination light transmission receiver and illumination light transmission system
US20120169248A1 (en) Smart dimmable power supply apparatus for energy saving lamp and method for the same
JP4534474B2 (en) Discharge lamp lighting device and optical transmission system
JP4609362B2 (en) Illumination light transmission system
JP6857823B2 (en) Illumination Optical communication equipment, lighting equipment, and lighting equipment
JP2011234204A (en) Optical communication system having light emission power control function
JP2009152130A (en) Discharge lamp lighting device and optical communication system
JP2010267386A (en) Discharge lamp lighting device

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20110420

A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A712

Effective date: 20120111

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20120927

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20121002

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20121126

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20121218

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20121225

R150 Certificate of patent or registration of utility model

Ref document number: 5171393

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

LAPS Cancellation because of no payment of annual fees