WO2022033257A1 - 一种可见光通信照明光源 - Google Patents

一种可见光通信照明光源 Download PDF

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Publication number
WO2022033257A1
WO2022033257A1 PCT/CN2021/105902 CN2021105902W WO2022033257A1 WO 2022033257 A1 WO2022033257 A1 WO 2022033257A1 CN 2021105902 W CN2021105902 W CN 2021105902W WO 2022033257 A1 WO2022033257 A1 WO 2022033257A1
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light
light source
communication
source
visible
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PCT/CN2021/105902
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English (en)
French (fr)
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陈彬
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深圳市绎立锐光科技开发有限公司
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Publication of WO2022033257A1 publication Critical patent/WO2022033257A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/502—LED transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention relates to the field of visible light communication, in particular to a visible light communication lighting source suitable for high-power lighting conditions.
  • Visible Light Communication refers to a communication method that uses light in the visible light band as an information carrier to directly transmit optical signals in the air.
  • Visible light communication technology is green and low-carbon, can achieve near-zero energy consumption communication, and can effectively avoid weaknesses such as leakage of electromagnetic signals in radio communication and the impact of electromagnetic waves on precision instruments, and quickly build a secure information space that is anti-interference and anti-interception.
  • white LED lamps can support faster switching speeds and perform higher data transmission rates.
  • illumination light of a white LED is usually used to transmit a modulated optical signal, and the optical signal receiver receives the modulated optical signal and converts it into an electrical signal for output to complete optical communication.
  • the illumination white light is composed of a mixture of LED blue light and yellow fluorescence emitted by the fluorescent material. Due to the persistence problem of the emitted fluorescence, high-speed optical communication cannot be realized. Therefore, in order to improve the bandwidth, it is usually necessary to add a signal before the optical signal receiver.
  • the filter filters out the fluorescence spectrum and accepts only the remaining blue light of the LED as signal detection light.
  • the present invention provides a visible light communication light source that has both high-power lighting and high-speed optical communication effects.
  • the present invention provides a visible light communication illumination light source, comprising a first light source and a second light source, the first light source and the second light source respectively emit first light and second light, and the wavelength ranges of the first light and the second light are both in the visible light range.
  • the first light source and the second light source are mixed to form white light; the first light source and the second light source are independently driven by receiving electrical signals, and the electrical signal received by the first light source is loaded with a communication modulation signal for optical communication.
  • the second light source is generally not loaded with a communication modulation signal and is mainly used for lighting, and the luminous flux of the first light source is smaller than that of the second light source.
  • the visible light communication system further includes an optical signal receiver, and a filter is arranged in front of the optical signal receiver to block the second light and transmit the first light.
  • the corresponding second light source is mainly used for lighting and has a larger luminous flux, while for the first light source, It is mainly used for loading communication signals and adjusting the color temperature of the mixed white light. Its luminous flux is low and power is low, and the modulated electrical signal of high-speed optical communication can be loaded on it; the two work together to make the visible light communication lighting of the present invention.
  • the light source can meet the needs of high-power lighting and high-speed optical communication at the same time.
  • the first light emitted by the first light source is blue light with a peak wavelength between 430-480 nm
  • the corresponding first light source can be a blue laser or a blue LED.
  • laser and LED light sources can support Faster switching speed to meet the needs of higher-speed optical communication.
  • the wavelength range of the second light emitted by the corresponding second light source covers 480-700 nm
  • the second light source may be an LED light source, or may be a light source formed by a blue LED excited phosphor powder.
  • the first light emitted by the first light source is red light with a peak wavelength of 600-700 nm
  • the corresponding first light source may be a red laser or a red LED light source.
  • the wavelength range of the second light emitted by the corresponding second light source covers 430-700 nm
  • the second light source may be a light source formed by exciting phosphor powder by a blue LED.
  • the second light source is a light source formed by excitation of a phosphor layer by a blue LED, and the phosphor layer is disposed on the optical path of the first light emitted by the first light source.
  • the first light emitted by the low-power first light source and the light emitted by the high-power LED chip in the second light source are emitted through the same phosphor layer.
  • the visible light communication illumination light source of the present invention includes a plurality of second light sources, the plurality of second light sources are arranged in a regular lattice, and a plurality of first light sources are evenly distributed among the plurality of second light sources arranged in the lattice regularly, so that the The corresponding emitted first light and second light are uniformly mixed.
  • the visible light communication illumination light source of the present invention includes a plurality of second light sources, and the plurality of second light sources are regularly arranged in a lattice; it also includes a scattering light guide strip, which is arranged around the second light source; the first light source The light emitted by the light source is coupled into the scattering light guide bar, and the light is scattered while being transmitted in the scattering light guide bar, so that the first light and the second light respectively emitted by the first light source and the plurality of second light sources are evenly mixed.
  • the visible light communication illumination light source of the present invention adds a first light source with low power mainly for optical communication in addition to the second light source mainly used for high-power lighting, and uses
  • the first light source has the characteristics of fast switching and switching speed to realize high-speed optical communication; at the same time, the first light and the second light emitted by the first light source and the second light source cooperate with each other in spectral ranges, and are mixed into white light output to realize high-power lighting .
  • FIG. 1 is a schematic structural diagram of a visible light communication system.
  • FIG. 2 is an illumination white light spectral combination in an embodiment of the present invention.
  • FIG. 3 is an illumination white light spectral combination in another embodiment of the present invention.
  • FIG. 4a and FIG. 4b are respectively different application situations of the visible light communication illumination light source in the bulb lamp according to Embodiment 1 of the present invention.
  • FIG. 5a and FIG. 5b are respectively different application situations of the visible light communication illumination light source in the panel lamp in Embodiment 2 of the present invention.
  • FIG. 6 is an application of a visible light communication lighting source in a pointing lighting fixture according to Embodiment 3 of the present invention.
  • Visible light communication combines lighting and communication.
  • the increasingly popular LED lamps have faster switching speeds, which has once again led to the rise of visible light communication;
  • the capacitance is getting larger and larger, and there is a problem that high-speed signals cannot be loaded and high-speed optical communication can be realized. How to achieve the effect of high-speed optical communication under high-power lighting is a very worthy problem.
  • the present invention creatively divides the visible light communication light sources into two groups.
  • One group can be regarded as high-power fluorescent light sources to meet the lighting needs; the other group is low-power and can be modulated at high speed.
  • the communication light source meets the needs of high-speed optical communication; at the same time, the spectra of the two groups of light sources are different, and they form white light after mixing.
  • the light source includes a first light source and a second light source, the first light source and the second light source
  • the light sources are respectively driven by different electrical signals, and then the first light source and the second light source respectively emit first light and second light, both of which have a wavelength range within the visible light range (420-700 nm).
  • the spectrum of the first light and the second light are different, and the two light together form white light; in particular, the luminous flux of the second light source is much larger than that of the first light source.
  • the luminous flux of the second light source can be set to the luminous flux of the first light source. 5 times.
  • the low-power first light source is additionally loaded with a modulation signal for communication
  • the second light source is generally not loaded with a modulation signal for communication, which is mainly used as an illumination light source
  • a filter is set in front of the machine, the filter transmits the first light with communication information emitted by the first light source, absorbs or reflects the second light emitted by the second light source, and the optical signal receiver receives the modulated light.
  • the optical signal is converted into electrical signal output to complete optical communication.
  • the second light source may also be loaded with a low frequency modulation signal as a supplement to the first light source modulated by high frequency communication.
  • the main function of the first light source is to load communication signals and adjust the color temperature to obtain white light, and its luminous flux is low.
  • the second light source is mainly used for lighting, and its luminous flux is large.
  • Figure 2 shows the illumination white light spectrum after the first light source and the second light source emit the first light and the second photosynthetic light, wherein the first light is blue light with a peak wavelength between 430-480 nm, and the corresponding first light source can be It is a laser light source or an LED light source; wherein the wavelength range of the second light covers 480-700 nm, and the corresponding second light source can be an LED light source or a light source formed by a blue LED excited phosphor.
  • the corresponding first light source may be a laser light source or an LED light source; wherein the wavelength range of the second light covers 430-700nm, the corresponding second light source can be a light source formed by blue LED excitation phosphor; in traditional LED lighting, usually only blue LED excites yellow phosphor YAG to form white light, but the white light lacks red light components , the color rendering index is not good, and the present invention additionally adds a first light source that emits red light, which can improve the color rendering index of white light illumination while realizing high-frequency optical communication.
  • a filter for filtering red light on the second light source to reduce the noise of the optical signal receiver.
  • light with other wavelength peaks such as green light
  • a green LED light source or an LD light source can be selected as the corresponding first light source.
  • the bulb lamp shown includes a lamp board and an arc lampshade connected to the lamp board, and the visible light communication lighting source of the present invention is arranged on the lamp board.
  • the visible light communication illumination light source is composed of a first light source and a second light source, and the first light source and the second light source are respectively driven by different electrical signals.
  • the first light source is a low-power blue LED chip
  • the second light source is a high-power lighting LED. It can be understood that the number of the first light source and the second light source is not limited to this. For example, two or more first and second light sources can be respectively formed into the visible light communication illumination light source of the present invention.
  • the first light source is a low-power blue LED chip, and a high-speed communication signal is further loaded into its driving electrical signal to realize high-speed optical communication, and the peak wavelength of the first light emitted is between 430-480nm;
  • the second light source is a high-power LED, No communication signal is loaded, and its specific composition is that the high-power blue LED chip is covered with phosphor powder, and the wavelength range of the second light emitted covers 430-700nm, and the color temperature is lower than 4500k. After adding the low-power blue light for communication, its color temperature Greater than 5000k.
  • the low-power LED chip of the first light source and the high-power LED chip of the second light source can also be arranged in the same LED, and a phosphor layer is arranged above the two chips.
  • the two chips are driven by two electrical signals respectively, and both chips emit blue light, and then the two blue light beams are irradiated on the phosphor layer.
  • the blue light emitted by the low-power LED chip of the light source is directly transmitted through the phosphor layer and emitted.
  • the LED chip disposed on the lamp board with a single light source needs to have Large enough area, however, large-area LED chips will cause the junction capacitance to become larger and larger, and there will be a problem of not being able to respond to the loaded high-speed electrical signal in time, and high-speed optical communication cannot be achieved.
  • an LED light source with low power and small area is added.
  • the two light sources are driven by different electrical signals, and the first light and the second photosynthesis are combined to achieve high power
  • the optical communication information contained in the first light realizes high-speed optical communication.
  • a blue light filter can be added on the second light source.
  • the light of the two light sources reaches the lampshade and then is further scattered and emitted.
  • the emitted light passes through the filter and then reaches the optical signal receiver to complete the optical communication.
  • the low-power blue light source used for optical communication is a blue laser, as shown in Figure 4b. Due to the non-Lambertian distribution of the divergence angle of the laser, in order to mix evenly with the high-power lighting LED, a scattering layer is added on the laser to make the divergence angle of the blue laser beam larger; the scattering layer can be silica gel plus titanium oxide and other scattering particles , or a scattering film, etc., which are not limited here.
  • the laser light of the first light source and the blue light emitted by the high-power LED chip in the second light source pass through the phosphor layer disposed on the LED chip of the second light source together, and the phosphor layer corresponds to the laser path emitted by the first light source.
  • Laser light that does not contain phosphors but contains scattering particles will be scattered.
  • the light source formed by the first light source being red light or green light and the second light source being a blue LED chip excited by a phosphor layer, it can also be set so that the light emitted by the LED chips in the first light source and the second light source respectively passes through the same fluorescent light source. powder layer.
  • FIG. 5a only the case where the visible light communication illumination light source of the present invention is arranged on a large-area lamp board is shown. It should be noted that the area of the panel light or the strip light is large, and the distance from the LED chip as the light source to the lampshade is relatively short. arrangement.
  • the second light source is a plurality of LEDs arranged in a dot matrix.
  • the first light source also needs to be arranged in a dot matrix, and the first light source can be LEDs light source.
  • the specific distribution is that a first light source is arranged next to each second light source, and a series relationship or a series connection and then a parallel relationship is adopted between the plurality of first light sources. It is easy to understand that one first light source can also be arranged next to every two or more second light sources, which is not limited here.
  • the plurality of first light sources and the plurality of second light sources are respectively driven by two electrical signals, and the wavelength range combination of the first light and the second light emitted by the first light source and the second light source may be the same as that of the first embodiment, or may be different. , and will not be repeated here.
  • the light emitted by the first light source may also use the method of scattering light guide strips to make the light reaching the lampshade uniform.
  • the specific setting is as follows: the emitted light of a first light source is first coupled into the scattering light guide strip, the scattering light guide strip is folded and interleaved and arranged beside the second light source arranged in a lattice, and there is scattered light on the scattering light guide strip, such as scattering light.
  • the light guide bar can be a scattering optical fiber or a light leakage groove cut out on an ordinary light guiding fiber as the scattering light guide bar, or can be a plastic square scattering light guide bar. In this way, the first light emitted by the first light source is transmitted and scattered in the scattering light guide strip, and finally uniformly mixed with the second light emitted by the second light source at the lampshade.
  • the pointing lighting fixture includes a visible light communication lighting source composed of a high-power second light source and a low-power first light source, and the first light source and the second light source are respectively driven by two electrical signals; Includes optical elements that collect light.
  • the optical element converts the Lambertian divergence light emitted by the visible light communication illumination source into a beam of small angle (0-60 degrees), so that the beam can be irradiated to a specified position or a further distance.

Abstract

本发明保护一种可见光通信照明光源。该可见光通信照明光源包括第一光源和第二光源，所述第一光源和第二光源分别发出第一光和第二光，所述第一光和第二光的波长范围均在可见光范围，所述第一光和第二光两者混合形成白光；所述第一光源和第二光源分别由不同的电信号驱动，所述驱动第一光源的电信号上加载有通信调制信号，用于光通信；所述第一光源的光通量小于所述第二光源的光通量。该可见光通信照明光源通过将小功率的通信第一光源和大功率的照明第二光源组合使用，使本发明的可见光通信照明光源兼具大功率照明和高速光通信的特点。

Description

一种可见光通信照明光源 技术领域
本发明涉及可见光通信领域，特别是涉及一种适用于大功率照明条件下的可见光通信照明光源。
背景技术
可见光通信技术(Visible Light Communication，VLC)是指利用可见光波段的光作为信息载体，在空气中直接传输光信号的通信方式。可见光通信技术绿色低碳、可实现近乎零耗能通信，还可有效避免无线电通信电磁信号泄露、电磁波对精密仪器的影响等弱点，快速构建抗干扰、抗截获的安全信息空间。
同时，与常规的白炽灯、荧光灯等相比，白光LED灯可以支撑更快的开关切换速度，进行更高速率的数据传输。
现有技术中通常使用白色LED的照明光来发送调制的光信号，光信号接收机接受到被调制的光信号后转化成电信号输出，完成光通信。具体地：照明白光由LED蓝光和荧光材料受激出射的黄色荧光混合而成，由于出射的荧光存在余晖问题、不能实现高速光通信，因此为提高带宽、通常需要在光信号接收机前增加一个滤光片滤除荧光光谱而只接受剩余LED蓝光作为信号检测光。
但是随着照明所需要的功率增大，LED芯片的结电容也会随之变大，无法在其上加载高速电信号，也就不能实现高速光通信，存在着大功率照明和高速光通信两者无法兼顾的矛盾。
因此，需要提供一种在保持大功率照明的同时依然能实现高速光通信的可见光通信照明光源。
发明内容
针对上述现有技术存在的缺陷，本发明提供了一种兼具大功率照明 和高速光通信效果的可见光通信光源。
本发明提供了一种可见光通信照明光源，包括第一光源和第二光源，第一光源和第二光源分别发出第一光和第二光，第一光和第二光的波长范围均在可见光范围，第一光和第二光两者混合形成白光；第一光源和第二光源分别独立的接收电信号而驱动，第一光源接收的电信号上加载有通信调制信号、用于光通信，第二光源上一般不加载通信调制信号、主要用于照明，第一光源的光通量小于第二光源的光通量。
当将本发明的可见光通信照明光源应用于可见光通信系统时，可见光通信系统还包括光信号接受机，在光信号接受机前设置一滤光片、用于阻挡第二光而透射第一光。
本发明的技术方案中，通过将第一光和第二光合光成大功率照明用混合白光，其中对应的第二光源主要用于照明，具有较大的光通量，而对于第一光源来说，其主要用于加载通信信号和为混合得到的白光调整色温，其光通量较低、功率较小，可在其上加载高速光通信的调制电信号；两者共同作用，使本发明的可见光通信照明光源能够同时满足大功率照明和高速光通信的需求。
优选的，第一光源发出的第一光是峰值波长在430-480nm之间的蓝光，对应的第一光源可以选择蓝光激光或蓝光LED，激光和LED光源相比于普通白炽灯或荧光灯可支撑更快的开关切换速度，满足更高速率光通信的需求。对应的第二光源发出的第二光的波长范围覆盖480-700nm，第二光源可以是LED光源，也可以是蓝光LED激发荧光粉形成的光源。
优选的，第一光源发出的第一光是峰值波长在600-700nm的红光，对应的第一光源可以选择红光激光或红光LED光源。对应的第二光源发出的第二光的波长范围覆盖430-700nm，第二光源可以是蓝光LED激发荧光粉形成的光源。
优选的，第二光源为蓝光LED激发荧光粉层形成的光源，荧光粉层设置于第一光源发出的第一光的光路上。小功率第一光源发出的第一光和第二光源中大功率LED芯片发出的光经过同一荧光粉层而出射。
优选的，本发明的可见光通信照明光源包含多个第二光源，多个第 二光源成点阵规则排列，在点阵规则排列的多个第二光源中间均匀分布若干个第一光源，以使两者对应发射出的第一光和第二光均匀混合。
优选的，本发明的可见光通信照明光源包含多个第二光源，多个第二光源成点阵规则排列；还包括散射导光条，散射导光条排布在第二光源的周边；第一光源发出的光耦合到散射导光条中，光线在散射导光条内边传输边散射，以使第一光源和多个第二光源分别发射出的第一光和第二光均匀混合。
与现有技术相比，本发明包括如下有益效果：本发明的可见光通信照明光源在主要起大功率照明用的第二光源外，另增一小功率主要起光通信作用的第一光源，利用第一光源具有快速开关切换速度的特性实现高速光通信；同时，第一光源和第二光源两者发射出的第一光和第二光光谱范围相互配合，混合为白光出射，实现大功率照明。
附图说明
附图仅用于示出具体实施例的目的，而并不认为是对本发明的限制。
图1为可见光通信系统结构示意图。
图2为本发明一种实施方式中的照明白光光谱组合。
图3为本发明另一种实施方式中的照明白光光谱组合。
图4a和图4b分别为本发明实施例1中可见光通信照明光源在球泡灯中的不同应用情形。
图5a和图5b分别为本发明实施例2中可见光通信照明光源在面板灯中的不同应用情形。
图6为本发明实施例3中可见光通信照明光源在指向照明灯具中的应用。
具体实施方式
下面结合附图和实施方式对本发明实施例进行详细说明。
可见光通信将照明与通信结合起来，逐渐普及的LED灯具有更快的开关切换速度，这一特点也再次让可见光通信兴起；然而随着照明所需要的功率越来越大，LED芯片对应的结电容也就越来越大，出现不能加 载高速信号、实现高速光通信的问题。如何实现在大功率照明下兼具高速光通信的效果是一个非常值得研究的问题。
现有的LED照明光源多是在蓝光LED芯片上覆盖荧光粉，混光实现白光照明。其中因为荧光有余晖问题，一般不作为光通信的光信号；那么为提高带宽，通常会在光信号接收机前增加一个滤光片滤除荧光，最后的结果就是蓝光LED芯片发出的蓝光中透射过荧光粉的剩余蓝光(大约10％)用作信息传输的光信号。
本发明正是从这一特点出发，创造性的将可见光通信光源分成两组，一组可看作是大功率的荧光光源，满足照明的需求；另一组是小功率的、可被高速调制的通信光源，满足高速光通信的需求；同时两组光源的光谱不一样，混合后形成白光。
如图1所示，其为一种可见光通信系统，包括本发明的可见光通信照明光源(如虚线框中所示)，该光源包括一个第一光源和一个第二光源，第一光源和第二光源分别由不同的电信号驱动，然后第一光源和第二光源分别发射出第一光和第二光，两者的波长范围都在可见光范围内(420-700nm)。
第一光和第二光的光谱不一样，两者合光后形成白光；特别的，第二光源的光通量远大于第一光源的光通量，例如，第二光源的光通量可以设置成第一光源光通量的5倍。
对于光通信部分来说，在小功率的第一光源上还额外加载有通信用的调制信号，第二光源上一般不加载通信用的调制信号、其主要作为照明光源；相应的在光信号接收机前设置一个滤光片，该滤光片透过第一光源发射出的带有通信信息的第一光，吸收或反射第二光源发射出的第二光，光信号接收机接收到被调制的光信号、转化成电信号输出，完成光通信。在本发明的一些实施方式中，第二光源也可以加载低频调制信号，作为高频通信调制的第一光源的补充。
从上可以看出，第一光源主要作用是用于加载通信信号和为得到白光调整色温使用，其光通量较低，第一光源通常采用LED光源或LD光源，利用它们开关快速切换的特点实现高速率的光通信；第二光源主要作用是用于照明，其光通量较大。
下面对两种光源的组合形式进行进一步的说明：
如图2所示为第一光源和第二光源发出第一光和第二光合光后的照明白光光谱，其中第一光为峰值波长在430-480nm之间的蓝光，对应的第一光源可以是激光光源或LED光源；其中第二光的波长范围覆盖480-700nm，对应的第二光源可以是LED光源或蓝光LED激发荧光粉形成的光源。
另一种情况为，如图3所示，其中第一光是峰值波长在600-700nm之间的红光，对应的第一光源可以是激光光源或LED光源；其中第二光的波长范围覆盖430-700nm，对应的第二光源可以是蓝光LED激发荧光粉形成的光源；在传统的LED照明中，通常仅有蓝光LED激发黄色荧光粉YAG形成照明白光，但是其照明白光中缺乏红光成分、显色指数不好，而本发明额外增加一个发红光的第一光源，在实现高频光通信的同时还可以改善照明白光的显色指数。
在这种组合情况下，优选的在第二光源上增加一个过滤红光的滤光片，以减少光信号接收机的噪声。可以理解的，对于第一光也可以选择其他波长峰值的光，例如绿光，相对应的第一光源选择绿色LED光源或LD光源。
下面结合具体实施例对本发明作进一步详细说明。以下实施例仅对本发明进行进一步说明，不应理解为对本发明的限制。
实施例1
普通照明场合下(球泡灯或吸顶灯等)，本发明可见光通信照明光源的应用：
如图4a所示，在所示的球泡灯中包含灯板和连接在灯板上的弧形灯罩，本发明的可见光通信照明光源设置在灯板上。图4a中可见光通信照明光源由一个第一光源加上一个第二光源组合而成，第一光源和第二光源分别由不同的电信号驱动。第一光源为小功率的蓝光LED芯片，第二光源为大功率照明LED。可以理解的，第一光源和第二光源的数目并不仅限于此，例如，还可以是分别由两个或多个第一、第二光源组成为本发明的可见光通信照明光源。
第一光源为小功率蓝光LED芯片，进一步在其驱动电信号中加载高 速通信信号，实现高速光通信，发出的第一光的峰值波长在430-480nm之间；第二光源为大功率LED，不加载通信信号，其具体组成为大功率蓝光LED芯片上覆盖荧光粉，发出的第二光的波长范围覆盖430-700nm、色温低于4500k，再加上通信用的小功率蓝光后，其色温大于5000k。另外，第一光源的小功率LED芯片也可以和第二光源中的大功率LED芯片设置在同一个LED中，两个芯片上方设置一个荧光粉层。两个芯片分别由两路电信号驱动，两个芯片均发出蓝光，然后两束蓝光照射到荧光粉层上，在荧光粉层对应于第一光源发出的蓝光路径处不包含荧光粉，第一光源的小功率LED芯片发出的蓝光直接透射过荧光粉层出射。
作为比较，现有的仅利用单一光源的LED灯进行光通信的技术中：若要满足大功率照明要求，类似于上述实施例1的设置，则设置在灯板上单一光源的LED芯片需要有足够大的面积，然而大面积的LED芯片会导致结电容也越来越大，出现不能及时响应加载的高速电信号的问题，无法实现高速光通信。
本实施例中，在作为大功率照明用的LED光源之外，增加一个小功率、小面积的LED光源，两个光源通过不同的电信号驱动，第一光和第二光合光之后实现大功率照明的同时、第一光中包含的光通信信息实现了高速光通信。
考虑到减少与通信信号相同波长的蓝光强度，提高光信号接收机的信噪比，进一步的可以在第二光源上面增加一个滤蓝光的滤光片。
两种光源的光线到达灯罩后再进一步的被散射出射，出射的光线经过滤光片后到达光信号接收机，完成光通信。
作为实施例1的变形例，其中用于做光通信的小功率蓝光光源为蓝色激光器，如图4b所示。由于激光器的发散角非朗伯分布，为了和大功率的照明LED发光混合均匀，在激光器上面增加一个散射层，使得蓝光激光光束的发散角更大；散射层可以是硅胶加氧化钛等散射粒子，也可以是散射薄膜等，在此不作限制。进一步的，第一光源的激光和第二光源中的大功率LED芯片发出的蓝光一同经过设置在第二光源LED芯片上的荧光粉层，在荧光粉层对应于第一光源发出的激光路径处不包含荧光粉而包含散射粒子将透过的激光散射。另外，对于第一光源为红光 或绿光、第二光源为蓝光LED芯片激发荧光粉层形成的光源，也同样可以设置成第一光源和第二光源中LED芯片分别发出的光经过同一荧光粉层。
实施例2
普通照明场合下(面板灯或条形灯等)，本发明可见光通信照明光源的应用：
如图5a所示，仅示出本发明可见光通信照明光源设置于大面积的灯板上的情形。需要说明的是，面板灯或条形灯的面积较大，而作为光源的LED芯片到灯罩的距离较短，为使光源到灯罩处的光较为均匀，其照明光源多采用多颗LED点阵排列。
在本实施例2中，第二光源为多颗点阵排列的LED，为了让通信光与照明光一样均匀的到达灯罩处，第一光源也需要呈现点阵排布，第一光源可以为LED光源。具体分布为在每1颗第二光源旁边设置一个第一光源，多颗第一光源之间采用串联关系或者先串联再并联的关系。容易理解的，也可以在每隔2颗或多颗第二光源的旁边设置一颗第一光源，在此不做限制。多颗第一光源和多颗第二光源分别由两路电信号驱动，对于第一光源和第二光源发出的第一光和第二光的波长范围组合可以与实施例1相同，也可不同，在此不再赘述。
作为实施例2的变形例，如图5b所示，第一光源发出的光也可以使用散射导光条的方法，使其到达灯罩的光均匀。具体设置为：一个第一光源出射光先耦合到散射导光条中，散射导光条折叠穿插排布在成点阵排列的第二光源的旁边，散射导光条上有散射出光，例如散射导光条可以为散射光纤或者普通光导光纤上切割出漏光槽作为散射导光条，还可以是塑料的方型散射导光条。如此，第一光源发射出的第一光在散射导光条内边传输、边散射，最后在灯罩处与第二光源发射出的第二光均匀混合。
实施例3
指向照明灯具下(手电筒、车灯、射灯等)，本发明可见光通信照明光源的应用：
如图6所示，指向照明灯具中包含由大功率的第二光源和小功率的 第一光源组合而成的可见光通信照明光源，第一光源和第二光源分别由两路电信号驱动；还包括收集光线的光学元件。光学元件将可见光通信照明光源发出的朗伯发散光变成小角度(0-60度)的光束，以便让光束照射到指定的位置或更远的距离。
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (10)

  1. 一种可见光通信照明光源，其特征在于，包括：
    第一光源和第二光源，所述第一光源和所述第二光源分别发出第一光和第二光，所述第一光和所述第二光的波长范围均在可见光范围，所述第一光和所述第二光两者混合形成白光；所述第一光源和所述第二光源分别由不同的电信号驱动，所述驱动第一光源的电信号上加载有通信调制信号，用于光通信；所述第一光源的光通量小于所述第二光源的光通量。
  2. 根据权利要求1所述的一种可见光通信照明光源，其特征在于，所述第一光源为LED光源或激光光源。
  3. 根据权利要求1所述的一种可见光通信照明光源，其特征在于，所述第一光源为激光光源，在所述第一光源出射的所述第一光的路径上设置有散射层。
  4. 根据权利要求1-3任一项所述的一种可见光通信照明光源，其特征在于，所述第一光是峰值波长在430-480nm之间的蓝光，所述第二光的波长范围覆盖480-700nm。
  5. 根据权利要求4所述的一种可见光通信照明光源，其特征在于，所述第二光源为LED光源，或者所述第二光源为蓝光LED激发荧光粉形成的光源。
  6. 根据权利要求1-3任一项所述的一种可见光通信照明光源，其特征在于，所述第一光是峰值波长在600-700nm之间的红光，所述第二光的波长范围覆盖430-700nm。
  7. 根据权利要求1或2所述的一种可见光通信照明光源，其特征在于，所述第二光源为蓝光LED激发荧光粉层形成的光源，所述荧光粉层设置于所述第一光源发出的第一光的光路上。
  8. 根据权利要求1所述的一种可见光通信照明光源，其特征在于，所述第二光源为多个，所述多个第二光源呈点阵规则排列，在点阵规则排列的多个第二光源中间分布有若干个所述第一光源。
  9. 根据权利要求1所述的一种可见光通信照明光源，其特征在于，所 述第二光源为多个，所述多个第二光源呈点阵规则排列；
    还包括散射导光条，所述散射导光条排布在所述多个第二光源的周边；所述第一光源发出的光耦合到散射导光条中，光线在散射导光条内传输及散射。
  10. 一种可见光通信系统，其特征在于，包括：
    权利要求1-9任一项所述的可见光通信照明光源，
    光信号接收机，在所述光信号接收机上设置一滤光片，所述滤光片阻挡至少部分所述第二光而透射所述第一光。
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