WO2010040265A1 - Led发光装置 - Google Patents

Led发光装置 Download PDF

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Publication number
WO2010040265A1
WO2010040265A1 PCT/CN2008/073028 CN2008073028W WO2010040265A1 WO 2010040265 A1 WO2010040265 A1 WO 2010040265A1 CN 2008073028 W CN2008073028 W CN 2008073028W WO 2010040265 A1 WO2010040265 A1 WO 2010040265A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
led lamp
lamp body
led
lighting device
Prior art date
Application number
PCT/CN2008/073028
Other languages
English (en)
French (fr)
Inventor
潘殿波
Original Assignee
Pan Dianbo
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 Pan Dianbo filed Critical Pan Dianbo
Publication of WO2010040265A1 publication Critical patent/WO2010040265A1/zh

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Classifications

    • 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
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F21V17/12—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening by screwing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • 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
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/002—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages with provision for interchangeability, i.e. component parts being especially adapted to be replaced by another part with the same or a different function
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/767—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having directions perpendicular to the light emitting axis
    • 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 present invention relates to an LED lighting device, and more particularly to an LED lighting device for use as an automobile lamp.
  • the present invention is based on a Chinese patent application filed on Oct. 08, 2008, the entire disclosure of which is incorporated herein by reference. Background technique
  • the LED lighting device is used as a lamp, and has the advantages of energy saving, long service life, high luminous brightness, etc., and has been widely used in lighting, decoration and other types of lamps.
  • LED lamps are typically mounted in a housing to form an LED illumination device, and LED illumination devices are now often used to replace conventional incandescent, neon or halogen lamps mounted in a fixture.
  • a conventional LED lighting device is shown in Fig. 1.
  • the LED lighting device 1 is mounted on a car lamp, i.e., mounted at the center of a bowl-shaped reflector cup 2.
  • the LED lighting device 1 comprises a cylindrical housing 1 1 and the housing 11 has a flat end wall 12.
  • Three LED lamps 13 are disposed in the casing 11 near the end wall 12. The light from the LED lamp 13 is directed to the inner wall of the reflector 2 and is reflected by the inner wall of the reflector 2.
  • Fig. 2 it is a cross-sectional view taken along line A-A in Fig. 1.
  • the LED lamp 13 emits light, wherein part of the light is directed vertically forward as shown by the light L2 in FIG. 2, and another portion of the light is directed toward the front side of the LED lighting device 1 as indicated by the light L1 in FIG. Reflected through the inner wall of the reflector 2.
  • the light emitted by the LED lamp 13 is mainly directed to the front of the LED lamp 13, regardless of whether the planar package or the convex lens, that is, the spherical package is used, since the bottom of the LED lamp 13 is a non-transparent metal heat conduction structure, and most of the LED lamps 13 use the bottom.
  • the reflective layer structure is used to make the LED light-emitting device have the characteristics of single-sided light emission, that is, the emission angle of the LED light-emitting device is less than 180 degrees. As shown in FIG.
  • the end wall is located above the bottom of the reflector 2, and the inner wall of the reflector 2 has a light dead angle, so that the brightness of the light reflected by the reflector 2 is not saturated. Dark areas appear. Gp, since the LED lamp 13 can only emit light to the front side and the front side, the inner wall of the reflector 2 located below the side of the LED lighting device 1 cannot receive the light emitted by the LED lamp 13, causing the reflector 2 to form a dark area near the center.
  • a primary object of the present invention is to provide an LED lighting device having a large illumination angle and capable of effectively reducing dark areas formed on the reflector;
  • Another object of the present invention is to provide an LED lighting device in which the light intensity distribution of the light reflected from the reflector is uniform.
  • the LED light-emitting device comprises an LED lamp body and a light-transmitting member, wherein the LED lamp body comprises a casing having one end wall, and an LED lamp is disposed in the casing near the end wall, and the light-transmitting member is self-contained.
  • the LED lamp body extends outward, and the light transmissive member is made of a transparent material which is a light-tight medium relative to air, that is, a dielectric material having a refractive index greater than that of the air, and the light transmissive member has at least one reflective surface and a Refractive surface.
  • the reflecting surface of the light transmissive member is a curved surface that is recessed toward the LED lamp body along the axis of the light transmitting member, and the reflecting surface is a roughened surface such as a surface treated with a matte or fine ring stripe.
  • the inner wall of the reflector receives the light emitted by the LED lamp uniformly, thereby reflecting the light. Strong uniform light.
  • Another LED lighting device may further comprise an LED lamp body and a light transmissive member, wherein the LED lamp body comprises a housing having an end wall, wherein the housing is provided with an LED lamp near the end wall, and the light transmissive member is a
  • the shell body extends outward from the LED lamp body and has at least one reflecting surface and a refractive surface, and a translucent plating layer is provided on the surface of the reflecting surface.
  • the reflecting surface of the light transmissive member is a curved surface that is recessed toward the LED lamp body along the axis of the light transmitting member, and the curved surface may be a hemispherical surface or a semi-elliptical surface, so that the light emitted by the LED light emitting device is directed to the top wall.
  • the incident angle is larger, and total reflection is easy to occur, and the area where the reflector receives the incident light is increased.
  • FIG. 1 is a schematic structural view of a conventional LED light-emitting device, in which an LED light-emitting device is mounted in a reflector;
  • FIG. 2 is a cross-sectional view taken along line A-A of FIG.
  • FIG. 3 is a schematic structural view of a first embodiment of the present invention, in which the LED lighting device is mounted in a reflector;
  • FIG. 4 is an exploded view of the first embodiment of the present invention;
  • Figure 5 is a structural view of a lens in the first embodiment of the present invention.
  • Figure 6 is a cross-sectional view taken along line B-B of Figure 3;
  • Figure 7 is a cross-sectional view showing a second embodiment of the present invention.
  • Figure 8 is a cross-sectional view showing a third embodiment of the present invention.
  • the LED lighting device 1 can be embodied by being mounted in the reflector 2, and the LED lighting device 1 of the present embodiment comprises an LED lamp body 30 and a light transmitting member disposed at one end of the LED lamp body 30. 20 composition, wherein the light transmissive member 20 extends outward from the end wall of the LED lamp body 30.
  • the LED lamp body 30 includes a housing 31 having a substantially cylindrical shape.
  • the housing 31 has an end wall 32, and the LED lamp 33 is disposed in the housing 31 near the end wall 32.
  • a cylindrical boss 34 is provided on the end wall 32, and the boss 34 extends outwardly of the end wall 32 along the axis of the LED lamp body 30.
  • the outer wall of the boss 34 is formed with an external thread 35 for matingly engaging with the internal thread on the light transmissive member 20 to fix the light transmissive member 20 to the LED lamp body 30.
  • the light transmissive member 20 is a solid body extending outward from the end wall 32 of the LED lamp body 30 and having a substantially cylindrical shape.
  • the peripheral wall having a cylindrical surface as the refractive surface 21 of the present embodiment, the top end of the light transmissive member 20
  • An end surface adjacent to the refractive surface 21 is provided, and the end surface forms the reflecting surface 22 of the present embodiment.
  • the face 21 includes an upper portion adjacent to the reflecting surface 22 and a lower portion perpendicular to the end wall 32 of the LED lamp body 30.
  • the reflecting surface 22 is recessed toward the direction of the LED lamp body 30 along the axis of the light transmitting member 20 to form a curved surface.
  • the curved surface is a hemispherical surface.
  • the reflective surface 22 can also be a semi-elliptical surface, a conical surface, or other curved surface, and such changes do not affect the practice of the present invention.
  • the light transmissive member 20 is made of a material which is a light-tight medium with respect to air, that is, a dielectric material having a refractive index greater than that of air, such as plexiglass, transparent plastic or the like.
  • the reflective surface 22 of the light transmissive member 20 and the upper portion of the refractive surface 21 are roughened surfaces, such as sandblasted, sandblasted or engraved with fine annular stripes, so that the reflective surface 22 and the refractive surface 21 are formed.
  • the upper surface is rough. After roughening, the light is reflected toward the roughened surface to form a diffuse reflection, and the parallel incident light is reflected to different angles, so that the light emitted by the LED lamp 33 can be uniformly reflected to the inner wall of the reflector 2, so that the light is reflected.
  • the light reflected from the cup 2 has a uniform light intensity.
  • the bottom of the light transmissive member 20 is provided with a bottom surface 23 opposite to the reflecting surface 22.
  • the bottom surface 23 of the light transmitting member 20 and the end of the housing 31 of the LED lamp body 30 are shown.
  • Wall 32 is contiguous.
  • the bottom end of the light transmissive member 20 defines a cylindrical recess 24, the recess 24 is equal in size to the boss 34 of the LED lamp body 30, and is provided with an internal thread 25, an internal thread 25 and a convex portion on the inner wall of the recess 24.
  • the external thread 35 on the outer wall of the table 34 is fitted.
  • the reflecting surface 22 of the light transmissive member 20 is a curved surface which is recessed toward the LED lamp body 30 along the axis of the light transmitting member 20, and the curved surface is a semispherical surface having a large radius of curvature.
  • the LED lamp 33 After the LED lighting device 1 is energized, the LED lamp 33 emits light, and part of the light is incident on the reflecting surface 22 of the light transmitting member 20 as indicated by the light L3. Since the light transmissive member 20 is made of a light-tight dielectric material, its refractive index is greater than that of air. At this time, the light ray L3 is emitted from the light transmitting member 20 toward the air, that is, from the optically dense medium to the light absorbing medium. When the incident angle of the light beam L3 is larger than the critical angle, total reflection occurs, and the incident light will be totally reflected into the light transmitting member 20 without being refracted into the air.
  • the reflecting surface 22 of the light transmissive member 20 is a curved surface having a large radius of curvature, and when the light beam L3 is incident on the reflecting surface 22, a large incident angle is easily formed, so that the light beam L3 is completely reflected.
  • an optical path as shown by the light beam L4 in the figure is formed, and the reflected light L4 is reflected onto the refractive surface 21 of the light transmitting member 20. Since the incident angle of the reflected light L4 on the refractive surface 21 is small, The total reflection is formed, but is refracted by the refractive surface 21 and is directed to the inner wall of the reflector 2.
  • the light ray L4 is refracted by the refracting surface 21 of the light transmitting member 20 to form a refracted light L5 which is incident on the inner wall of the reflecting cup 2.
  • the light beam L5 is directed to the inner wall of the reflector 2 below the side of the LED light-emitting device 1, that is, to the bottom of the reflector 2, so that the inner wall of the reflector 2 below the side of the LED illumination device 1 is also received by the LED lamp 33. The light.
  • part of the light emitted by the LED lamp 33 is also refracted by the light transmissive member 20 to the inner wall of the reflector 2 above the side of the LED illumination device 1, so that almost all surfaces of the inner wall of the reflector 2 can receive the light emitted by the LED illumination device 1.
  • the dark area formed on the reflector 2 is greatly reduced.
  • part of the light emitted by the LED lamp 33 can also pass through the reflecting surface 22 of the light transmitting member 20 toward the front of the LED lighting device 1.
  • the inner wall of the reflector 2 can receive the light from the LED lamp 33 and reflect the received light.
  • the LED lighting device 1 After the LED lighting device 1 is mounted on the car lamp, the LED lighting device 1 can be seen from various angles to emit light of uniform brightness.
  • the present embodiment is composed of an LED lamp body 30 and a light transmissive member 40, and an LED lamp 33 is disposed in the LED lamp body 30. Further, the end wall 32 of the housing 31 of the LED lamp body 30 is also provided with a boss, and the outer wall of the boss is provided with an external thread.
  • the light transmissive member 40 in this embodiment is also made of a material which is a light-tight medium with respect to air, i.e., a dielectric material having a refractive index greater than that of air.
  • the light transmissive member 40 has a refractive surface 41 and a reflecting surface 42, the upper portion of the refractive surface 41 is adjacent to the reflecting surface 42, and the lower portion is perpendicular to the end wall 32 of the housing 31 of the LED lamp body 30.
  • the reflecting surface 42 is not a curved surface that is recessed toward the inside of the light transmitting member 40, but is a flat surface, and the reflecting surface 42 is parallel to the end wall 32 of the LED lamp body 30.
  • the upper surface of the reflecting surface 42 and the refractive surface 41 are both roughened surfaces, so that the light forms diffuse reflection on the reflecting surface 42 and the upper portion of the refractive surface 41.
  • the bottom of the light transmissive member 40 is also provided with a notch 44.
  • the inner wall of the recess 44 is internally threaded, and the internal thread of the light transmissive member 40 is coupled with the external thread on the LED lamp body 30, thereby realizing the light transmissive member 40 and The LED lamp body 30 is fixedly connected.
  • the LED lighting device 1 After the LED lighting device 1 is energized, part of the light emitted by the LED lamp 33 is directed toward the reflecting surface 42 as shown by the light L6 in FIG. 7, since the light L6 is emitted from the light transmitting member 40 to the air, that is, from the optically dense medium to the light.
  • the incident angle of the light L6 is greater than the critical angle, the light L6 may be totally reversed on the reflective surface 2 Shot, forming reflected light L7.
  • the reflected light L7 is incident on the refracting surface 41 of the light transmitting member 40, and is refracted on the refracting surface 41, and the refracted light L8 is directed downward toward the side of the LED illuminating device 1, that is, toward the inner wall of the reflecting cup.
  • the inner wall of the reflector has a large area to receive the light from the LED lamp 33, effectively preventing the formation of dark areas in the reflector.
  • the upper surface of the reflecting surface 42 and the refractive surface 41 is roughened, the light that is incident on the reflecting surface 42 and the upper portion of the refractive surface 41 is diffusely reflected, and the parallel incident light is reflected in different directions, and the inner wall of the reflective cup can be everywhere. Uniformly receives incident light, making the light reflected by the reflector more uniform.
  • the embodiment is composed of an LED lamp body 30 and a light transmitting member 50.
  • the LED lamp 33 is disposed in the casing 31 of the LED lamp body 30.
  • the light transmissive member 50 has a substantially cylindrical shape, and has a side wall 51 and a top wall 52 disposed at the top end of the light transmissive member 50.
  • the top wall 52 is adjacent to the side wall 51, and the top wall is directed to the LED lamp body 30 along the axis of the light transmissive member 50.
  • the direction is concave and a curved surface is formed.
  • the curved surface is a hemispherical surface.
  • the top wall 52 can also be provided as a different curved surface such as a semi-elliptical surface or a conical surface, and these changes can also achieve the object of the present invention.
  • the light transmissive member 50 of the present embodiment is not a solid body but a shell-like light transmitting body having a side wall 51 and a top wall 52.
  • the inner surface of the top wall 52 of the light transmissive member 50 is used as the reflecting surface 53 of the embodiment.
  • the surface of the reflecting surface 53 is provided with a translucent plating layer.
  • the plating material of the plating layer may be metal such as nickel or silver.
  • the reflecting surface 53 is smooth and reflects incident light.
  • the side wall 51 of the light transmissive member 50 has an inner surface and an outer surface, wherein the inner surface forms the first refractive surface 54 of the present embodiment.
  • the outer surface of the side wall forms the second refractive surface 55 of the present embodiment.
  • the LED lamp 33 After the LED lighting device 1 is energized, the LED lamp 33 emits light, and part of the light emitted from the LED lamp 33 is incident on the reflecting surface 53 as shown by the light L9 in FIG. Since the reflecting surface 53 is provided with a translucent plating layer, the light beam L9 directed to the reflecting surface 53 is reflected onto the first refractive surface 54 of the light transmitting member 50 to form an optical path as shown by the light beam L10.
  • the reflected light L10 is refracted after being incident on the first refractive surface 54 of the light transmitting member 50, and the refracted light L1 l is formed in the side wall 51 of the light transmitting member 50.
  • the refraction light L11 occurs again when it hits the second refractive surface 55
  • the light is refracted, and a light ray L12 is formed, and the direction of the light ray L12 coincides with the direction of the light ray L10.
  • the light L12 emitted from the light-transmitting member 50 is directed to the lower side of the LED light-emitting device 1, that is, the inner wall of the reflector below the side of the LED light-emitting device 1 receives the light from the LED lamp 33.
  • the LED lamp body 30 of the present embodiment is the same as the LED lamp body of the first embodiment, and the end wall thereof is provided with a boss extending outward along the axis of the LED lamp body 30, and the outer wall of the boss is provided with an external thread.
  • the inner surface of the side wall 51 of the light transmitting member 50 is provided with an internal thread which cooperates with the external thread, so that the light transmitting member 50 can be fixed to the LED lamp body 30 by the internal thread and the external thread formed on the boss.
  • a paste, a snap connection, and a slot may be used between the light transmissive member and the LED lamp body.
  • the housing of the LED lamp body may be provided in a variety of different shapes such as an elliptical cylinder shape or a prismatic shape, and these changes do not affect the implementation of the present invention.
  • the present invention is not limited to the above embodiments, such as a change in the shape of the reflecting surface of the light transmitting member, a change in the manner of roughening the reflecting surface, and a change in the material of the plating layer on the reflecting surface of the light transmitting member in the third embodiment. Changes are also intended to be included within the scope of the appended claims.
  • a light transmissive member made of a light-tight dielectric material is further disposed outside the casing, and a part of the light emitted from the LED lamp is reflected to the reflecting surface of the light transmitting member to form a total reflection, and the light is formed. It is reflected to the refracting surface of the light transmissive member, and then refracted through the refracting surface to the inner wall of the reflector below the side of the LED illuminating device. Therefore, the inner wall of the reflector below the side of the LED illumination device can also receive the light emitted by the LED lamp, so that the entire reflector can reflect the light and avoid the formation of dark areas.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Description

LED发光装置 技术领域
本发明涉及一种 LED发光装置，尤其是一种作为汽车灯使用的 LED发光装 置。本发明基于申请日为 2008年 10月 08日、 申请号为 200810199075. 1的中 国发明专利申请， 该申请的内容作为参考引入本文。 背景技术
LED发光装置作为灯具使用，具有节能、使用寿命长、发光亮度高等优点， 已广泛地用于照明、 装饰等多类灯具中。 LED灯通常被装载在一壳体内而形成 LED发光装置，现在 LED发光装置常被用于替换安装在灯具中的传统白炽灯泡、 曰光灯或卤素灯。
现有一种 LED发光装置如图 1所示， LED发光装置 1安装在汽车灯上， 即 被安装在一碗状的反光杯 2中心处。 LED发光装置 1包括圆柱形的壳体 1 1， 壳 体 11具有平坦的端壁 12。在壳体 11内靠近端壁 12处设有三个 LED灯 13， LED 灯 13发出的光线射向反光杯 2的内壁， 并经反光杯 2内壁反射出去。
参见图 2， 是图 1中沿 A-A方向的剖视图。 LED发光装置 1通电后， LED 灯 13发光， 其中部分光线如图 2中光线 L2所示垂直地射向前方， 另一部分光 线如图 2中光线 L1所示射向 LED发光装置 1的侧前方， 经反光杯 2的内壁反 射出去。
通常， LED灯 13发出的光线主要射向 LED灯 13的前方， 无论采用平面封 装或采用凸透镜， 即球面封装的方式， 由于 LED灯 13的底部是非透明金属导 热结构， 且多数 LED灯 13采用底部镀反射层结构， 使 LED发光装置具有单面 发光的特点， 即 LED发光装置的发射角小于 180度。如图 2中， 当 LED发光装 置 1配合反光杯 2使用时， 端壁位于反光杯 2底部之上， 反光杯 2内壁会有一 光线死角， 从而使反光杯 2反射出的光线亮度不饱和， 有暗区出现。 gp， 由于 LED灯 13只能向正前方以及侧前方发出光线， 位于 LED发光装置 1侧下方的 反光杯 2内壁无法接收到 LED灯 13发出的光线， 造成反光杯 2靠近中心处形 成暗区。 这样， LED发光装置 1装入汽车灯时， 反光杯 2无法全方位地反射出亮度 均匀的光线， 导致人们从侧面观看到的汽车灯光面明暗不均， 不利于照明或对 行人及其他车辆的驾驶员发出警示信息。 发明内容
本发明的主要目的是提供一种具有较大发光角度并能有效缩小反光杯上 形成的暗区的 LED发光装置；
本发明的另一目的是提供一种使反光杯反射出的光线光强分布均匀的 LED发光装置。
为实现上述的主要目的，本发明提供的 LED发光装置包括 LED灯体以及透 光件， 其中 LED灯体包括具有一端壁的壳体， 壳体内靠近端壁处设有 LED灯， 透光件自 LED灯体向外延伸， 且透光件由相对空气为光密介质透明材料制成， 也就是由折射率大于空气折射率的介质材料制成， 同时，透光件至少具有一反 射面以及一折射面。
一个优选的方案是，透光件的反射面为沿透光件轴线向 LED灯体方向凹陷 的曲面， 并且反射面为经过粗化处理的表面， 如经过磨砂或细密环形条紋处理 的表面。 这样， LED灯射出的光线射到向内凹陷的曲面上时， 入射光线的入射 角更大， 更容易发生全反射， 增大反光杯接收 LED灯射出光线的面积， 避免在 反光杯上形成暗区。
并且， 光线射到粗化处理后的反射面时还会发生漫反射， 反射光线射向反 光杯内壁的不同方向上， 使反光杯内壁均匀的接收到 LED灯射出的光线， 从而 可反射出光强均匀的光线。
根据本发明提供的另一种 LED发光装置还可以包括 LED灯体以及透光件， 其中 LED灯体包括具有一端壁的壳体， 壳体内靠近端壁处设有 LED灯，透光件 为一壳状体， 其自 LED灯体向外延伸， 并且至少具有一反射面以及折射面， 在 反射面的表面设有半透明的电镀层。
由此可见， LED 发光装置发出的光线射到透光件反射面内表面的电镀层 时， 部分光线将被反射至透光件的折射面上， 并经过折射面折射到 LED发光装 置侧下方的反光杯内壁上。 这样， LED发光装置侧下方的反光杯内壁也反射出 光线， 避免反光杯形成暗区。
优选的方案是，透光件的反射面为沿透光件轴线向 LED灯体方向凹陷的曲 面， 该曲面可以是半球面或半椭圆面， 这样可使 LED发光装置射出的光线射向 顶壁的入射角更大， 容易发生全反射， 增大反光杯接收入射光线的面积。 附图说明
图 1是现有 LED发光装置的结构示意图，图中 LED发光装置装于反光杯中； 图 2是图 1沿 A-A向的剖视图；
图 3是本发明第一实施例的结构示意图，图中 LED发光装置装于反光杯中； 图 4是本发明第一实施例的结构分解图；
图 5是本发明第一实施例中透镜的结构图；
图 6是图 3沿 B-B向的剖视图；
图 7是本发明第二实施例的剖视图；
图 8是本发明第三实施例的剖视图。
以下结合附图及实施例对本发明作进一步说明。 具体实施方式
第一实施例：
参见图 3， 根据本发明的 LED发光装置 1， 其优点可以通过安装在反光杯 2中后得以体现， 本例 LED发光装置 1由 LED灯体 30以及设置在 LED灯体 30 一端的透光件 20组成， 其中透光件 20自 LED灯体 30的端壁向外延伸。
参见图 4， 是本实施例的结构分解图。本实施例中， LED灯体 30包括壳体 31， 壳体 31大致呈圆柱形， 壳体 31具有端壁 32， LED灯 33设置在壳体 31 内靠近端壁 32处。在端壁 32上设有一圆柱形凸台 34， 凸台 34沿 LED灯体 30 轴线向端壁 32外延伸。 凸台 34的外壁形成有外螺紋 35， 用于与透光件 20上 的内螺紋配合连接， 从而将透光件 20固定在 LED灯体 30上。
透光件 20为一实心体， 其自 LED灯体 30的端壁 32向外延伸， 且大致呈 圆柱形， 具有作为本实施例折射面 21的呈圆柱面的周壁，透光件 20的顶端设 有与折射面 21邻接的端面， 端面形成本实施例的反射面 22。 本实施例中， 折 射面 21包括与反射面 22邻接的上部及垂直于 LED灯体 30端壁 32的下部。反 射面 22沿透光件 20的轴线向 LED灯体 30的方向凹陷， 形成一曲面，优选地， 该曲面为半球面。 当然， 反射面 22也可以是半椭圆面、 圆锥面或者其他曲面， 这些改变并不影响本发明的实施。
并且， 透光件 20由相对于空气为光密介质材料制成， 即由折射率大于空 气折射率的介质材料制成， 如有机玻璃、 透明塑料等。
本实施例中， 透光件 20的反射面 22以及折射面 21上部是经过粗化处理 的表面， 如经过磨砂、 喷砂或刻入细密环形条紋等处理， 使反射面 22以及折 射面 21的上部表面粗糙。 经过粗化处理， 光线射向经过粗化处理的表面时形 成漫反射， 将平行入射的光线反射至不同的角度上， 可使 LED灯 33发出的光 线均匀的反射到反光杯 2内壁， 使反光杯 2反射出的光线光强均匀。
参见图 5， 透光件 20的底部设有与反射面 22相对的底面 23， 透光件 20 固定在 LED灯体 30时， 透光件 20的底面 23与 LED灯体 30壳体 31的端壁 32 邻接。
透光件 20的底端开设有一圆柱形的凹口 24， 凹口 24大小与 LED灯体 30 的凸台 34相等， 并且在凹口 24的内壁上设有内螺紋 25， 内螺紋 25与凸台 34 外壁上的外螺紋 35配合。 这样， 透光件 20与 LED灯体 30可通过内螺紋 25 与外螺紋 35的配合实现固定连接。
参见图 6， 透光件 20的反射面 22为一沿透光件 20轴线向 LED灯体 30方 向凹陷的曲面， 该曲面为一半球面， 其曲率半径较大。
LED发光装置 1通电后， LED灯 33发光， 部分光线如图中光线 L3所示射 到透光件 20的反射面 22上。 由于透光件 20由光密介质材料制成， 其折射率 大于空气的折射率。此时， 光线 L3从透光件 20射向空气， 也就是从光密介质 射向光疏介质。 当光线 L3的入射角大于临界角时发生全反射， 入射光线将被 全部反射到透光件 20内， 不会折射到空气中。
由图 6可见， 本实施例中，透光件 20的反射面 22为一曲率半径较大的曲 面， 光线 L3的射到反射面 22时容易形成较大的入射角， 使光线 L3完全被反 射至透光件 20内， 形成如图中光线 L4所示的光路， 反射光线 L4被反射到透 光件 20的折射面 21上。 由于反射光线 L4射到折射面 21上的入射角较小， 没 有形成全反射， 而是经过折射面 21折射后射向反光杯 2的内壁。
光线 L4经过透光件 20的折射面 21折射后， 形成射向反光杯 2内壁的折 射光线 L5。由图 6可见，光线 L5射向 LED发光装置 1侧下方的反光杯 2内壁， 也就是射向反光杯 2的底部，使 LED发光装置 1侧下方的反光杯 2内壁也接收 到 LED灯 33发出的光线。
当然， LED灯 33发出的部分光线还会通过透光件 20折射至 LED发光装置 1侧上方的反光杯 2内壁， 这样， 反光杯 2内壁几乎所有表面均可接收 LED发 光装置 1发出的光线， 大大缩小了反光杯 2上形成的暗区。 同时， LED灯 33 发出的部分光线还可以穿过透光件 20的反射面 22射向 LED发光装置 1的前方。
这样， LED发光装置 1通电后， 反光杯 2内壁均可接收到 LED灯 33发出 的光线， 并将接收到的光线反射出去。 LED发光装置 1安装到汽车灯上后， 人 们可从各个角度观看到 LED发光装置 1射出亮度均匀的光线。
第二实施例：
参见图 7， 是本发明第二实施例的剖视图。 与上一实施例相同的是， 本实 施例由 LED灯体 30及透光件 40组成， LED灯体 30内设有 LED灯 33。 并且， LED灯体 30壳体 31的端壁 32上也设有凸台， 凸台的外壁上开设有外螺紋。
本实施例中透光件 40也是由相对于空气为光密介质材料制成， 即由折射 率大于空气折射率的介质材料制成。 同时，透光件 40具有折射面 41以及反射 面 42， 折射面 41的上部与反射面 42邻接， 下部垂直于 LED灯体 30壳体 31 的端壁 32。 与上一实施例不同的是， 本实施例中， 反射面 42不是向透光件 40 内部凹陷的曲面， 而是一平面， 并且反射面 42与 LED灯体 30的端壁 32平行。 同时， 反射面 42与折射面 41的上部均为经过粗化处理的表面， 便于光线在反 射面 42以及折射面 41上部形成漫反射。
透光件 40的底部也开设有凹口 44， 凹口 44的内壁上形成有内螺紋， 透 光件 40的内螺紋与 LED灯体 30上的外螺紋配合连接， 从而实现透光件 40与 LED灯体 30固定连接。
LED发光装置 1通电后， LED灯 33发出的部分光线如图 7中光线 L6所示 射向反射面 42， 由于此时光线 L6从透光件 40射向空气， 即从光密介质射向 光疏介质， 光线 L6的入射角大于临界角时， 光线 L6可在反射面 2上发生全反 射， 形成反射光线 L7。
反射光线 L7射向透光件 40的折射面 41， 并在折射面 41上发生折射， 折 射光线 L8射向 LED发光装置 1侧下方， 也就是射向反光杯内壁。 这样， 反光 杯内壁有较大的面积可接收 LED灯 33发出的光线， 有效避免反光杯形成暗区 的情况的发生。
同时， 由于反射面 42 以及折射面 41 的上部经过粗化处理， 射向反射面 42以及折射面 41上部的光线发生漫反射， 平行入射的光线被反射至不同的方 向， 反光杯内壁各处可均匀的接收入射光线， 使反光杯反射出的光线光强更加 均匀。
第三实施例：
参见图 8， 本实施例由 LED灯体 30以及透光件 50组成， LED灯体 30的壳 体 31内设有 LED灯 33。
透光件 50大致呈圆柱形， 其具有侧壁 51以及设置在透光件 50顶端的顶 壁 52， 顶壁 52与侧壁 51邻接， 并且顶壁沿透光件 50轴线向 LED灯体 30方 向凹陷， 形成曲面。本实施例中， 该曲面为半球面。当然， 本发明实际应用时， 顶壁 52还可以设置为半椭圆面或圆锥面等不同的曲面， 这些改变也可以实现 本发明的目的。
与第一及第二实施例不同的是， 本实施例的透光件 50并非实心体， 而是 具有侧壁 51及顶壁 52的壳体状透光体。并且，透光件 50顶壁 52的内表面作 为本实施例的反射面 53， 反射面 53的表面设有半透明的电镀层， 该电镀层的 电镀材料可以是镍或银等金属， 以使反射面 53光滑， 并可将入射光线反射。
并且，透光件 50的侧壁 51具有一内表面以及外表面， 其中内表面形成本 实施例的第一折射面 54， 侧壁的外表面形成本实施例的第二折射面 55。
LED发光装置 1通电后， LED灯 33发光， 其发出的部分光线如图 8中光线 L9所示， 射到反射面 53。 由于反射面 53设有半透明的电镀层， 射向反射面 53的光线 L9被反射到透光件 50的第一折射面 54上， 形成如光线 L10所示的 光路。
反射光线 L10射到透光件 50的第一折射面 54后发生折射， 在透光件 50 的侧壁 51内形成折射光线 Ll l。折射光线 L11射到第二折射面 55时再次发生 折射， 并形成光线 L12， 并且光线 L12的方向与光线 L10的方向一致。
由图 8可见，从透光件 50射出的光线 L12射向 LED发光装置 1的侧下方， 也就是在 LED发光装置 1侧下方的反光杯内壁可接收到 LED灯 33发出的光线。
当然， 射向透光件 50顶壁 52的部分光线将穿过顶壁 52射向 LED灯体 30 的正前方以及侧前方， 这样， 反光杯内壁几乎均可以接收到 LED灯 33发出的 光线， 缩小在反光杯上形成的暗区面积。
同时， 本实施例的 LED灯体 30与第一实施例的 LED灯体相同， 其端壁上 设有沿 LED灯体 30轴线向外延伸的凸台， 凸台的外壁上开设有外螺紋。 而透 光件 50侧壁 51的内表面开设有与外螺紋配合的内螺紋， 这样， 透光件 50可 通过内螺紋以及形成在凸台上的外螺紋固定在 LED灯体 30上。
当然， 上述实施例仅是本发明的较佳的三个实施方案， 实际应用中， 还可 以有更多的改变， 例如， 透光件与 LED灯体之间可使用粘贴、 卡扣连接、 槽樺 连接等其他方式替代螺紋连接， 或者用环氧树脂硅胶等材料通过模具加温成 型， 将 LED灯体与透光件封为一体， 或者将 LED灯做成不同形状， 如采用平面 或球面封装， 又或者将 LED灯体的壳体设置成椭圆柱状、棱柱状等多种不同形 状， 这些改变并不影响本发明的实施。
最后需要强调的是， 本发明不限于上述实施方式， 如透光件反射面形状的 改变、反射面粗化处理方式的改变、第三实施例中透光件反射面电镀层材料的 改变等微小的变化也应该包括在本发明权利要求的保护范围内。 工业应用性
根据本发明的 LED发光装置，在壳体外还设有由光密介质材料制成的透光 件， LED灯向前方射出的部分光线射到透光件的反射面时形成全反射， 并将光 线反射到透光件的折射面上，再经过折射面折射到 LED发光装置侧下方的反光 杯内壁上。 因此， LED发光装置侧下方的反光杯内壁也可接收到 LED灯射出的 光线， 使整个反光杯都能反射出光线， 避免暗区的形成。

Claims

权利要求书
1、 LED发光装置， 包括
LED灯体， 所述 LED灯体具有
壳体， 所述壳体具有一端壁；
设置在壳体内靠近端壁处的 LED灯；
其特征在于：
一自 LED灯体端壁向外延伸的透光件；
所述透光件由相对空气为光密介质的材料制成，并至少具有一反射面及 折射面。
2、 根据权利要求 1所述的 LED发光装置， 其特征在于：
所述透光件的反射面及折射面为经过粗化处理的表面。
3、 根据权利要求 2所述的 LED发光装置， 其特征在于：
所述反射面为沿透光件轴线向 LED灯体方向凹陷的曲面。
4、 根据权利要求 3所述的 LED发光装置， 其特征在于：
所述曲面为半球面或半椭圆面或圆锥面中的一种。
5、 根据权利要求 2所述的 LED发光装置， 其特征在于：
所述透光件的反射面为一平面；
所述平面与所述 LED灯体的端壁平行。
6、 根据权利要求 1至 5任一项所述的 LED发光装置， 其特征在于： 所述 LED灯体还设有沿 LED灯体轴线向端壁外延伸的凸台；
所述透光件底部设有与所述凸台配合的凹口。
7、 根据权利要求 6所述的 LED发光装置， 其特征在于：
所述凸台外壁设有外螺紋；
所述凹口内壁设有与所述外螺紋配合的内螺紋。
8、 LED发光装置， 包括 LED灯体， 所述 LED灯体具有
壳体， 所述壳体具有一端壁；
设置在壳体内靠近端壁处的 LED灯；
其特征在于：
一自 LED灯体端壁向外延伸的透光件；
所述透光件为一壳状体， 至少具有一反射面及折射面；
所述反射面的表面设有半透明的电镀层。
9、 根据权利要求 8所述的 LED发光装置， 其特征在于：
所述反射面为沿透光件轴线向 LED灯体方向凹陷的曲面。
10、 根据权利要求 9所述的 LED发光装置， 其特征在于：
所述 LED灯体还设有沿 LED灯体轴线向端壁外延伸的凸台，所述凸台外壁 设有外螺紋；
所述透光件设有与所述外螺紋配合的内螺紋。
PCT/CN2008/073028 2008-10-08 2008-11-12 Led发光装置 WO2010040265A1 (zh)

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