WO2014183242A1 - 一种led直下式面板灯具 - Google Patents

一种led直下式面板灯具 Download PDF

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Publication number
WO2014183242A1
WO2014183242A1 PCT/CN2013/001586 CN2013001586W WO2014183242A1 WO 2014183242 A1 WO2014183242 A1 WO 2014183242A1 CN 2013001586 W CN2013001586 W CN 2013001586W WO 2014183242 A1 WO2014183242 A1 WO 2014183242A1
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WIPO (PCT)
Prior art keywords
light
luminaire
lens
led
reflecting surface
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.)
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Application number
PCT/CN2013/001586
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English (en)
French (fr)
Inventor
杨静
邓诗涛
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Opple Lighting Co Ltd
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Opple Lighting Co Ltd
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Application filed by Opple Lighting Co Ltd filed Critical Opple Lighting Co Ltd
Publication of WO2014183242A1 publication Critical patent/WO2014183242A1/zh
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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements
    • 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]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the invention relates to the field of lighting technology, in particular to an LED direct type panel luminaire. Background technique
  • LED Light Emitting Diode
  • LED has the advantages of energy saving and environmental protection, and is widely used in various fields of life and production. With such low-carbon, energy-saving, environmentally-friendly, long-life LED lamps, the LED lamps are increasingly favored by the society. How to improve the luminous efficiency and provide a panel lamp with uniform illumination is urgently needed in the field of lighting technology.
  • the technical solution of the present invention provides an LED direct-type panel luminaire, comprising: an LED light source (10), a lens (20), a diffusion plate (30), a lamp body (40) and an optical cavity A, wherein the optical cavity A is
  • the diffuser plate (30) and the lamp body (40) are configured such that light emitted from the LED light source (10) passes through the lens (20) and passes through the optical cavity A formed by the diffuser plate (30) and the lamp body (40). Part of the light travels back and forth within the optical cavity A until it emerges from the diffuser plate (30).
  • the above lamp may further comprise a bracket (50).
  • the above bracket (50) is located in the optical cavity A.
  • the lens (20) is placed on the bracket (50), and the light emitted from the LED light source (10) is transmitted back and forth between the diffuser plate (30) and the bracket (50) via the lens (20) until Exit from the diffuser plate (30).
  • the LED light source (10) described above may form an array of light sources, and the lens (20) may form a lens array.
  • the lens (20) includes a first incident surface (21), a second incident surface (22), a first reflecting surface (23), a second reflecting surface (24), and a light emitting surface (25), and a lens (20) 20)
  • the first incident surface (21) and the second incident surface (22) divide the incident light into two parts, and a part of the light passes through the first
  • the incident surface (21) passes through the first reflecting surface (23) and the light emitting surface (25), and then exits from the diffusing plate (30); the other portion passes through the second incident surface (22) and passes through the second reflecting surface (24). It also passes through the first reflecting surface (23) and the light exiting surface (25), and finally also exits from the diffusing plate (30).
  • a portion of the first reflecting surface (23) is a frosted surface.
  • the first reflecting surface (23) is a conical surface, and the cross-sectional view is an inverted triangular shape.
  • the surface of the bracket (50) is painted or powdered to form a highly diffuse reflecting surface.
  • the light is controlled to achieve uniform emission by adjusting the distance between the bracket (50) and the diffusion plate (30).
  • the diffusing plate (30) is provided with some white diffuse printing dots.
  • the LED light source (10) is a 1W ⁇ 3W high power package LED.
  • FIG. 1 is a schematic view showing the assembled structure of the first embodiment of the present invention
  • FIG. 2 is a schematic exploded view of a structure according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic structural view of a lens according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic diagram of an ideal propagation path of a lens light according to Embodiment 1 of the present invention.
  • Figure 5 is a light path diagram of a ceiling lamp according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic structural view of a bracket according to Embodiment 1 of the present invention.
  • Fig. 7 is a view showing the optical path in the ceiling lamp of the second embodiment of the present invention. detailed description
  • FIG. 1 is a schematic view showing the assembled structure of the first embodiment of the present invention
  • FIG. 2 is a schematic view showing the structure of the first embodiment of the present invention
  • FIG. 3 is a schematic view of the lens structure of the first embodiment of the present invention
  • FIG. 6 is a schematic view showing the structure of a stent according to Embodiment 1 of the present invention.
  • 5 and 7 are two preferred embodiments of the present invention, FIG. 5 is a first embodiment, and FIG. 7 is a second embodiment.
  • the LED direct-type panel luminaire mainly includes an LED light source 10, a lens 20, a diffusion plate 30, a lamp body 40, and a bracket 50.
  • a lens 20 is used, and the light emitted from the LED light source 10 is directed to the surrounding area, and then the optical cavity similar to the light guide plate formed by the diffusion plate 30 and the bracket 50 is formed. A, a part of the light is propagated back and forth in the optical cavity A formed by the diffusion plate 30 and the holder 50 until it emerges from the diffusion plate 30.
  • the LED light source 10 can form an array of light sources, and the lens 20 can form a lens array, and the lens array and the light source array correspond.
  • the lens 20 includes a first incident surface 21, a second incident surface 22, a first reflecting surface 23, a second reflecting surface 24, and a light exiting surface 25.
  • the first incident surface 21 and the second incident surface 22 of the lens 20 divide the incident light into two parts, a part of the light passes through the first incident surface 21 via the first reflective surface 23, and converges into parallel light; the other part of the light passes through the second incident
  • the surface 22 passes through the second reflecting surface 24 and also becomes parallel light via the first reflecting surface 23, and the optical axes of the two parallel light beams are aligned, and both are emitted from the light emitting surface 25.
  • light is transmitted through the lens 20 in the peripheral direction.
  • Such light propagation in the lens belongs to the ideal propagation path, as shown in Figure 4.
  • the first incident surface 21, the second incident surface 22, and the second reflective surface 24 of the lens can be designed according to a TIR (Total Internal Reflector) lens (the TIR lens divides the incident light into two paths, one way from A structure similar to a convex lens is emitted, and all the way uses total reflection to emit light, thereby improving light extraction efficiency).
  • the first reflecting surface 23 may be a conical surface, which is an inverted triangle or a free curved surface as viewed from a cross-sectional view of the lens 20. In this solution, a certain area of the first reflecting surface 23 can be made into a matte surface to form a transflective effect (as shown in FIG.
  • the lens when we design the lens, most of the light is hit on the surface 23 , total reflection occurs. But if the face 23 is made into a matte surface, Destroy total reflection and let a part of the light pass out. ), so that a small portion of the light can be emitted, and more light can be directed to the surrounding area.
  • the light emitted by the LED light source 10 passes through the first incident surface 21 and the second incident surface 22 of the lens 20 to divide the incident light into two parts, and a part of the light passes through the first incident surface 21 via the first reflective surface 23 and the light exit surface 25, and then diffuses. Plate 30 exits as indicated by beam 2.
  • the other part of the light passes through the second incident surface 22, passes through the second reflective surface 24, and also propagates or reflects back and forth in the optical cavity A formed by the bracket 50 and the diffusion plate 30 via the first reflective surface 23 and the light exit surface 25 until It emerges from the diffuser plate 30 as indicated by beam 1.
  • the LED light source 10 is a surface light source, and some areas of the first reflecting surface 23 are made of a frosted surface, the light does not all belong to the ideal propagation path (parallel from the light emitting surface 25) Exit, but have a divergence angle, as shown in Figure 5. That is, the light emitted from the light exit surface 25 of the lens 20 propagates back and forth through the optical cavity A formed by the holder 50 and the diffusion plate 30 until it emerges from the diffusion plate 30.
  • the surface of the holder 50 may be painted or powdered to form a highly diffuse reflecting surface. And a hole can be made in the bracket (as shown in Fig. 6), and the lens 20 is placed in the opening.
  • the holder 50 and the diffusion plate 30 form a closed optical cavity A similar to the light guide plate.
  • the solution can also adjust the distance between the bracket 50 and the diffuser plate 30 to control the light to achieve the hook out.
  • some white diffuse reflection printing dots may be disposed on the diffusion plate 30 to control the light emission and further obtain a uniform light-emitting surface.
  • the LED light source 10 selects a 1W ⁇ 3W high power package LED, such as Cree's XPG, or an SMT package 1W LED, such as the AOT 3030.
  • the LED direct-type panel lamp mainly comprises an LED light source 10, a lens 20, a diffusion plate 30, and a lamp body 40.
  • FIG. 7 is a view showing an optical path in a ceiling lamp according to Embodiment 2 of the present invention.
  • the LED light source 101 is a surface light source, and some areas of the reflecting surface 23 are made of a frosted surface, the light does not all belong to the ideal propagation path, but has a divergence angle. which is The light emitted from the lens 201 is propagated back and forth through the optical cavity A formed by the diffusion plate 301 and the lamp body 401 until it is emitted from the diffusion plate 301.
  • one LED light source 101 corresponds to one lens 201, that is, the lens array corresponds to the light source array.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

提供了一种LED直下式面板灯具，包括：LED光源（10）、透镜（20）、扩散板（30）、灯体（40）以及一光学腔A，光学腔A由扩散板（30）与灯体（40）构成，从LED光源（10）发出的光，经由透镜（20），再通过扩散板（30）与灯体（40）所形成的光学腔A，使部分光在光学腔A内来回传播，直到从扩散板（30）出射。

Description

一种 LED直下式面板灯具 技术领域
本发明涉及照明技术领域， 尤其是一种 LED直下式面板灯具。 背景技术
LED (Light Emitting Diode, 发光二极管） 具有节能、 环保等优点， 广 泛应用于生活、 生产的各个领域。 随着具这样的具有低碳、 节能、 环保、 寿 命长等特性的 LED灯具越来越受到社会的亲睐， 如何提升发光效率， 提供 一种发光均匀的面板灯具， 是目前照明技术领域亟待解决的问题之一。 发明内容
本发明的技术方案为提供一种 LED直下式面板灯具， 包括： LED光源 ( 10)、 透镜 （20)、 扩散板 （30)、 灯体 （40) 以及一光学腔 A， 上述光学 腔 A由扩散板 （30) 与灯体 （40) 构成， 从 LED光源 （10) 发出的光， 经 由透镜 （20)， 再通过扩散板 （30) 与灯体 （40) 所形成的光学腔 A， 使部 分光在光学腔 A内来回传播， 直到从扩散板 (30)出射。
优选的， 上述灯具还可包含一支架 （50)。
优选的， 上述支架 （50) 位于光学腔 A中。
优选的， 上述透镜（20)放置在支架上 （50)， 从 LED光源 （10) 发出 的光， 经由透镜 （20) 通过在扩散板 （30) 与支架上 （50) 间的来回传播， 直到从扩散板 (30)出射。
优选的，上述 LED光源 (10)可形成光源阵列，透镜 (20)可形成透镜阵列。 优选的， 上述透镜 （20) 包含有第一入射面 （21 )、 第二入射面 （22)、 第一反射面 （23 )、 第二反射面 （24) 以及出光面 （25)， 透镜 （20) 的第一 入射面 （21 )和第二入射面 （22)将入射光分成两部分， 一部分光通过第一 入射面 （21) 经由第一反射面 （23) 和出光面 （25)， 然后从扩散板 （30) 出射； 另一部分光通过第二入射面 （22)， 经过第二反射面 （24) 后也经由 第一反射面 （23) 和出光面 （25)， 最终也从扩散板 （30) 上出射。
优选的， 上述第一反射面 （23) 部分区域为磨砂面。
优选的， 上述第一反射面 （23) 为圆锥面， 其剖面图为倒三角形状。 优选的， 上述支架 （50) 表面可用油漆或涂粉形成高漫反射面。
优选的， 通过调节上述支架 （50) 和扩散板（30) 间的距离， 来控制光 线实现均匀出射。
优选的， 上述扩散板 （30) 上设置一些白色漫反射印刷点。
优选的， 上述 LED光源 （10) 为 1W~3W大功率封装 LED 。
附图说明
图 1是本发明实施例一的组装结构示意图；
图 2是本发明实施例一的结构爆炸示意图；
图 3是本发明实施例一的透镜结构示意图；
图 4是本发明实施例一的透镜光线理想传播路径示意图；
图 5是本发明实施例一之吸顶灯内光路图；
图 6是本发明实施例一之支架结构示意图；
图 7是本发明实施例二之吸顶灯内光路图。 具体实施方式
以下结合附图和具体实施例对本发明提出的一种 LED直下式面板灯具 作进一步详细的说明。
图 1是本发明实施例一的组装结构示意图； 图 2是发明实施例一的结构 爆炸示意图； 图 3是发明实施例一的透镜结构示意图； 图 4是发明实施例一 的透镜光线理想传播路径示意图； 图 6是发明实施例一之支架结构示意图。 图 5和图 7为本发明两个较佳的实施例， 图 5为实施例一， 图 7表示实 施例二。
如图 1-6所示，在本发明实施例一中，该 LED直下式面板灯具主要包括 LED光源 10、 透镜 20、 扩散板 30、 灯体 40以及支架 50。 在方案中， 通过 提供一种 LED直下式面板灯具， 采用透镜 20， 将从 LED光源 10发出的光， 射向周围区域， 再通过扩散板 30与支架 50所形成的类似于导光板的光学腔 A, 使部分光在由扩散板 30与支架 50所形成的光学腔 A内来回传播， 直到 从扩散板 30出射。
进一步的， 在本发明实施例一中， LED光源 10可形成光源阵列， 透镜 20可形成透镜阵列，透镜阵列和光源阵列对应。而对于每一颗透镜单元而言 (如图 3所示)， 透镜 20包含有第一入射面 21、 第二入射面 22、 第一反射面 23、 第二反射面 24以及出光面 25。 其中， 透镜 20的第一入射面 21和第二 入射面 22将入射光分成两部分， 一部分光通过第一入射面 21经由第一反射 面 23， 汇聚成平行光； 另一部分光通过第二入射面 22， 经过第二反射面 24 后也经由第一反射面 23， 也变成平行光， 两部分平行光的光轴方向一致， 且 均从出光面 25出射。 这样， 通过透镜 20， 光向周围方向传播。 这样的光线 在透镜传播属于理想传播路径， 如图 4所示。
在本发明实施例中， 由于透镜第一入射面 21、 第二入射面 22以及第二 反射面 24可按照 TIR (Total Internal Reflector) 透镜来设计 （TIR透镜是将 入射光分成两路， 一路从类似凸透镜的结构出射， 一路利用全反射来出光， 以此提高出光效率）。 第一反射面 23可为圆锥面， 从透镜 20的剖面图上看 是一个倒三角形， 或者是自由曲面。 在本方案中， 可将第一反射面 23某一 段区域做成磨砂面， 形成半透半反的效果（如图 4所示， 我们设计透镜的时 候， 是让大部分光打到面 23上， 发生全反射。 但如果将面 23做成雾面， 就 破坏全反射， 让一部分光透射出去。）， 这样既可以有一小部分光出射， 又可 以保证有更多的光射向周围区域。 LED光源 10发出的光线经过透镜 20的第 一入射面 21和第二入射面 22将入射光分成两部分，一部分光通过第一入射 面 21经由第一反射面 23和出光面 25， 然后从扩散板 30出射， 如光束 2所 示。 另一部分光通过第二入射面 22， 经过第二反射面 24后也经由第一反射 面 23和出光面 25， 在由支架 50和扩散板 30所形成的光学腔 A内来回传播 或反射， 直到从扩散板 30上出射， 如光束 1所示。
因此， 在本发明实施例中， 由于 LED光源 10是面光源， 并且第一反射 面 23的某些区域做成磨砂面后， 光线就并不都是属于理想传播路径 （从出 光面 25平行的出射）， 而是有一个发散角， 如图 5所示。 即从透镜 20出光 面 25出射的光， 经过由支架 50和扩散板 30所形成的光学腔 A内来回传播 或反射， 直到从扩散板 30上出射。
此外， 在本方案中， 支架 50表面可用油漆或涂粉形成高漫反射面。 并 且可在支架上开孔 (如图 6所示)， 正好将透镜 20放进上述开孔中。这样支架 50和扩散板 30就形成了密闭的类似于导光板的光学腔 A。 此外， 本方案还 可以调节支架 50和扩散板 30间的距离， 来控制光线实现均勾出射。
同时， 也可以在扩散板 30上设置一些白色漫反射印刷点， 用来控制光 的出射， 进一步得到均匀的出光面。
在本发明实施例中， LED光源 10选择 1W~3W大功率封装 LED，如 Cree 的 XPG， 或者 SMT封装 1W LED, 如 AOT 3030 等。
在本发明实施例二中，这种 LED直下式面板灯具主要包括 LED光源 10、 透镜 20、 扩散板 30以及灯体 40。 如图 7所示为本发明实施例二之吸顶灯内 光路图。
在本方案中， 由于 LED光源 101是面光源， 并且反射面 23的某些区域 做成磨砂面后， 光线就并不都是属于理想传播路径， 而是有一个发散角。 即 从透镜 201出射的光，经过由扩散板 301和灯体 401所形成的光学腔 A内来 回传播或反射， 直到从扩散板 301上出射。
在本发明实施例中， 一颗 LED光源 101对应一颗透镜 201， 即透镜阵列 与光源阵列对应。
上文对本发明优选实施例的描述是为了说明和描述， 并非想要把本发明 穷尽或局限于所公幵的具体形式， 显然， 可能作出许多修改和变化， 这些修 改和变化可能对于本领域技术人员来说是显然的，应当包括在由所附权利要 求书定义的本发明的范围之内。

Claims

权利要求
1. 一种 LED直下式面板灯具， 包括： LED光源（10)、透镜（20)、 扩散板 （30 )、 灯体 （40) 以及一光学腔 A， 其特征在于所述光学腔 A由 扩散板（30)与灯体（40) 构成， 从 LED光源（10) 发出的光， 经由透镜
(20)， 再通过扩散板（30)与灯体（40)所形成的光学腔 A， 使部分光在 光学腔 A内来回传播， 直到从扩散板 (30)出射。
2. 根据权利要求 1所述的灯具，其特征在于所述灯具还可包含一支 架 （50)。
3. 根据权利要求 2所述的灯具， 其特征在于所述支架（50)位于光 学腔 A中。
4. 根据权利要求 2所述的灯具， 其特征在于， 所述透镜（20)放置 在支架上 （50)， 从 LED光源 （10) 发出的光， 经由透镜 （20) 通过在扩 散板 （30) 与支架上 （50) 间的来回传播， 直到从扩散板 (30)出射。
5. 根据权利要求 1所述的灯具， 其特征在于所述 LED光源 (10)可 形成光源阵列， 透镜 (20)可形成透镜阵列。
6. 根据权利要求 1所述的灯具， 其特征在于所述透镜（20)包含有 第一入射面（21 )、第二入射面（22)、第一反射面（23 )、第二反射面（24) 以及出光面（25 )， 透镜（20) 的第一入射面（21 )和第二入射面（22)将 入射光分成两部分， 一部分光通过第一入射面（21 )经由第一反射面（23 ) 和出光面（25 )，然后从扩散板（30)出射；另一部分光通过第二入射面（22)， 经过第二反射面（24)后也经由第一反射面（23)和出光面（25)， 最终也 从扩散板 （30) 上出射。
7. 根据权利要求 6所述的灯具， 其特征在于所述第一反射面 （23) 部分区域为磨砂面。
8. 根据权利要求 6所述的灯具， 其特征在于所述第一反射面 （23) 为圆锥面， 其剖面图为倒三角形状。
9. 根据权利要求 2所述的灯具， 其特征在于所述支架（50)表面可 用油漆或涂粉形成高漫反射面。
10. 根据权利要求 1或 2所述的灯具，其特征在于通过调节所述支架 (50) 和扩散板 （30) 间的距离， 来控制光线实现均匀出射。
11. 根据权利要求 1所述的灯具， 其特征在于所述扩散板（30)上设 置一些白色漫反射印刷点。
12. 根据权利要求 1所述的灯具， 其特征在于所述 LED光源 （ 10) 为 1W〜3W大功率封装 LED
PCT/CN2013/001586 2013-05-13 2013-12-17 一种led直下式面板灯具 Ceased WO2014183242A1 (zh)

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