WO2020015457A1 - 一种汽车近光灯用投射单元及其车灯 - Google Patents

一种汽车近光灯用投射单元及其车灯 Download PDF

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Publication number
WO2020015457A1
WO2020015457A1 PCT/CN2019/088531 CN2019088531W WO2020015457A1 WO 2020015457 A1 WO2020015457 A1 WO 2020015457A1 CN 2019088531 W CN2019088531 W CN 2019088531W WO 2020015457 A1 WO2020015457 A1 WO 2020015457A1
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Prior art keywords
light
projection unit
reflecting
low beam
light source
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PCT/CN2019/088531
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English (en)
French (fr)
Inventor
张洁
董世琨
孟凡
李飞泉
陈佳缘
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华域视觉科技(上海)有限公司
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Priority to US17/282,342 priority Critical patent/US20210356090A1/en
Publication of WO2020015457A1 publication Critical patent/WO2020015457A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
    • F21W2102/135—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions

Definitions

  • the invention relates to the technical field of vehicle lights, and in particular, to a projection unit for a low beam of an automobile and a vehicle lamp thereof.
  • the projection unit for a low beam of the automobile and the vehicle lamp thereof can realize a low beam illumination with a cut-off line requirement And fog lights and other lamp functions, at the same time, can also achieve the light function without the cut-off line requirements.
  • the existing projection type vehicle lamp lighting system generally consists of a light source 1, a mirror 2, a light shielding plate 3, and an optical lens 4.
  • the reflecting mirror 2 is generally a paraboloid-like reflecting surface, which has a near focus and a far focus.
  • the light source 1 is disposed at the near focus.
  • the approximately Lambertian divergent light emitted by the light source 1 is reflected by the reflecting mirror 2.
  • the light blocking structure 3a of the light shielding plate 3 is also set near the focal point of the optical lens 4.
  • the shape of the light blocking structure 3a is cut off according to the required light and darkness The shape of the line is determined. Part of the light converged near the focal point of the optical lens 4 is blocked by the light shielding structure 3 a of the light shielding plate 3 to form a dark area.
  • the light-shielding structure 3a of the light-shielding plate 3 is an important mechanism for forming the cut-off line of light and darkness when the conventional projection unit is used for a low beam.
  • the existing projection type vehicle lamp lighting system has a large number of component parts, which results in complicated parts assembly relationships, and due to the existence of part manufacturing errors and assembly assembly errors, the product performance fluctuates greatly.
  • the brightness of the left and right lamps are inconsistent, causing customers to complain, and the manufacturing costs are relatively high;
  • the existing projection-type vehicle lighting system due to the large number of components of the existing projection-type vehicle lighting system (for example, the reflectors and light shields necessary for the existing projection-type vehicle lighting system), it will also cause the lighting system to have a heavier weight, complicated assembly relationships, and accumulation. Defects such as large errors.
  • the light-shielding structure (light-dark cut-off line) 3a using the light-shielding plate 3 causes the light efficiency of the existing projection-type vehicle lighting system to decrease;
  • the space is also large, which is not conducive to the flat design of the lamp.
  • the existing projection type vehicle lighting system has a large number of component parts, resulting in complicated assembly relationships of parts, and due to the existence of parts manufacturing errors and assembly assembly errors, the lighting system has a large weight, complicated assembly relationships, and large cumulative errors. Cause product performance fluctuations.
  • the object of the present invention is to provide a new type of projection unit for automotive low beam and its headlight.
  • the vehicle light has functions such as low-beam lighting and fog lights, and realizes a flat design of the vehicle light.
  • the specific structure of the light source, the reflector, and the optical lens of the projection unit, as well as their connections and settings, can be used to replace the past. Reflectors and visors necessary for technology.
  • the object of the present invention is also to provide a new type of projection unit for automobile low beam and its headlight.
  • the projection unit for automobile low beam and its headlight can realize a low beam lighting with a cut-off line requirement.
  • fog lights and other lamp functions at the same time, can also achieve the light function without the cut-off line requirements, such as high beam, daytime running lights, position lights, brake lights, reversing lights, turning lights and other functions.
  • the specific structure of the light source, the reflector, and the optical lens of the projection unit, as well as its connection and setting, can be used to replace the reflectors and light shields necessary in the prior art, thereby greatly reducing the volume and space of the vehicle light, thereby reducing Less product performance fluctuations due to parts manufacturing errors and assembly assembly errors.
  • the technical scheme of the projection unit for the automobile low beam of the present invention is as follows:
  • a projection unit for a low beam of an automobile includes a light source and an optical lens in a direction in which the low beam is emitted, and is characterized by:
  • a light reflector is provided in the direction of the optical axis of the light source, and the light reflected by the reflector reflects the road surface through the optical lens.
  • the reflecting plate has a reflecting boundary corresponding to the shape of the cut-off line required for the light shape of the vehicle lamp system to replace the light shielding plate and its boundary.
  • the reflecting boundary of the reflecting plate is set at or near the focal point of the optical lens.
  • the light source illuminates the reflector, and the light reflected by the reflector forms a preliminary illumination light shape, and then passes through
  • the light source is preferably a surface light source, and preferably an LED.
  • the reflecting surface of the reflecting plate is arc-shaped, and the reflecting boundary of the reflecting plate is located at the upper end of the reflecting plate.
  • the reflecting surface of the reflecting plate is arc-shaped, and the reflecting boundary of the reflecting plate is located at the lower end of the reflecting plate (as shown in Figures 11, 12, and 13).
  • the reflecting boundary of the reflecting plate is set at a distance of 0-5 mm from the focal point of the lens.
  • the light reflected by the reflecting boundary of the reflecting plate is irradiated to the incident surface of the lens at a nearly horizontal angle.
  • the reflectivity of the reflecting plate is not less than 80%.
  • the reflective plate material achieves reflectivity through surface treatment, such as surface aluminum plating.
  • Adding a secondary light distribution element between the light source and the reflective plate can gather light or change the light energy distribution and improve the light efficiency.
  • the reflecting plate is selected from a flat reflecting mirror, a curved reflecting mirror, and a reflecting mirror connected by a multi-curved mirror.
  • the secondary light distribution member disposed between the light source and the reflective plate is selected from a convex lens, a transparent light conductor, or a mirror.
  • the secondary light distribution member disposed between the light source and the reflective plate is a convex lens to improve light intensity.
  • the secondary light distribution member disposed between the light source and the reflector is a reflector for improving light efficiency.
  • a vehicle lamp adopts the projection unit for an automobile low beam as described above.
  • the specific structure of the light source, the reflector, and the optical lens of the projection unit, as well as its connection and setting, can be used to replace the reflectors and light shields necessary in the prior art, thereby greatly reducing the submission and space of the vehicle lights. Therefore, less product performance fluctuations due to the existence of parts manufacturing errors and assembly assembly errors.
  • the specific structure of the light source, the reflecting plate, and the optical lens of the projection unit, as well as the connection and setting thereof, can be used to replace the reflecting mirror and the light shielding plate necessary in the prior art.
  • the specific structure of the light source, the reflector, and the optical lens of the projection unit, as well as their connections and settings can be used to replace the reflectors and light shields necessary in the prior art, and reduce
  • FIG. 1 is a schematic structural diagram of a conventional lamp projection unit
  • FIG. 2 is a light emitting schematic diagram of a conventional lamp projection unit
  • 3A is a schematic diagram of an optical path of a projection unit for a low beam of an automobile according to the present invention.
  • 3B is a front view of the lens side of the projection unit for a low beam of an automobile of the present invention
  • FIG. 4 is a schematic diagram of a low beam light path of a projection unit for a low beam of an automobile according to the present invention
  • FIG. 5 is a schematic diagram of a low-beam illumination light path of a projection unit for a low-beam lamp of an automobile according to the present invention
  • FIG. 6A is a schematic view of the installation state of a reflector of a projection unit for a low beam of an automobile according to the present invention.
  • FIG. 6B is a schematic left side view of the reflector of the projection unit for the low beam of the automobile shown in FIG. 6A,
  • 6C is a top view of a reflective surface of a reflector of a projection unit for a low beam of an automobile shown in FIG. 6A;
  • FIG. 7A is a schematic diagram of adding a secondary light distribution member between a light source and a reflective plate of a projection unit for an automobile low beam of the present invention
  • FIG. 7B is a front view of the lens side of the projection unit for the low beam of the automobile of FIG. 7A;
  • FIG. 7C is a left side view of the projection unit for the low beam of the automobile of FIG. 7B;
  • FIG. 8 is a schematic diagram of the optical path of the projection unit for the low beam of the automobile of FIG. 7A by adding a secondary light distribution member between the light source and the reflector;
  • 9A is a schematic diagram of another example of adding a secondary light distribution member between the light source and the reflector in the projection unit for a low beam of an automobile of the present invention.
  • FIG. 9B is a front view of the lens side of the projection unit for the low beam of the automobile of FIG. 9A;
  • 9C is a left side view of the projection unit for the low beam of the automobile of FIG. 9B;
  • FIG. 10 is a schematic diagram of another example of the optical path of the projection unit for the low beam of the automobile of FIG. 9A by adding a secondary light distribution member between the light source and the reflector;
  • FIG. 11 is a schematic diagram of a reflecting boundary of the reflecting plate at the lower end of the reflecting plate
  • FIG. 12 is a schematic diagram of an example of an optical path where a reflective boundary of a reflective plate is located at a lower end of the reflective plate;
  • 13A, 13B, and 13C are respectively a front view, a left view, and a top view of a reflective boundary of the reflective plate at the lower end of the reflective plate.
  • 1-LED light-emitting chip circuit board 2-reflector, 3-shield, 3a-cut-off line, 4-optical lens, 5-reflector, 5a-bright cut-off line of the reflective boundary of the reflector, 6 -Secondary light distribution lens.
  • the reflective boundary of the reflector corresponds to the shape of the cut-off line required for the light shape of the vehicle light system.
  • a projection unit for a low beam of an automobile includes a light source and an optical lens, and a reflective plate is provided.
  • the upper boundary of the reflective plate has a boundary corresponding to the shape of the cut-off line required by the light shape of the vehicle lamp system to replace it.
  • the light-shielding plate and its boundary, and the light-reflecting boundary of the light-reflecting plate is set at the focal point of the optical lens.
  • the light source is an LED surface light source. The light source illuminates the reflector, and the light reflected by the reflector forms a preliminary illumination light shape, and then irradiates the road surface through an optical lens to form a final illumination light shape with a cut-off line of light and darkness.
  • the deflection angle of the optical axis of the light source of the projection unit with respect to the normal of the reflector is set to 45.
  • a light reflecting plate is arranged at 45 degrees below the light source obliquely, the reflecting surface of the light reflecting plate is arc-shaped, and the surface of the material of the light reflecting plate is plated with aluminum to achieve a reflectance of not less than 80%.
  • the reflective boundary of the reflector is located at the upper end of the reflector, and the optical axis of the light source of the projection unit is parallel to the normal of the reflector. The light reflected by the reflector is irradiated onto the road parallel to the optical axis of the optical lens.
  • the light intensity distribution of the illumination light shape of the secondary light shape is controlled by setting the curvature of the reflecting surface, so that the light intensity of the secondary light shape increases as the distance from the turning point of the cut-off line of light and darkness approaches.
  • the reflector is illuminated by the light source, and the light reflected by the reflector forms a preliminary illumination light shape, and then is irradiated to the road surface through an optical lens to form a final illumination light shape with cut-off lines.
  • a secondary light distribution element is added between the light source and the reflective plate.
  • the secondary light distribution element is a convex lens and a reflector, which plays a role of gathering light or changing the light energy distribution and improving the light efficiency.
  • the reflecting boundary of the reflecting plate is set at a distance of 0-5 mm from the focal point of the lens.
  • the reflecting boundary of the reflecting plate is located at the lower end of the reflecting plate, as shown in FIGS. 11, 12 and 13.
  • the specific structure of the light source, the reflecting plate, and the optical lens of the projection unit, as well as the connection and setting thereof, can be used to replace the reflecting mirror and the light shielding plate necessary in the prior art.
  • functions such as lighting and fog lights it greatly reduces the submission and space of car lights, and realizes the flat design of car lights.
  • the specific structure of the light source, the reflector, and the optical lens of the projection unit, as well as their connections and settings can be used to replace the reflectors and light shields necessary in the prior art, and reduce

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

Abstract

一种汽车近光灯用投射单元及车灯，投射单元包括：光源（1）、反光板（5）及光学透镜（4），反光板（5）上侧边界具有与车灯***照明光形所要求的明暗截止线形状相对应的反光边界（5a）；反光边界（5a）设置在光学透镜（4）焦点附近，通过光源（1）照亮反光板（5），经反光板（5）反射的光线形成初步照明光形，再通过光学透镜（4）照射到路面，形成最终具有明暗截止线的照明光形；在光源（1）及反光板（5）之间可设置二次配光件（6）。该投射单元可减小车灯体积及空间，利于车灯的扁平化设计，且能够减少因零件制造及总成装配误差而导致的产品性能波动。

Description

一种汽车近光灯用投射单元及其车灯 技术领域
本发明涉及车灯技术领域，具体涉及一种汽车近光灯用投射单元及其车灯，所述汽车近光灯用投射单元及其车灯可实现一种具有明暗截止线要求的近光照明及雾灯等车灯功能，同时，也可以实现没有明暗截止线要求的车灯功能。
背景技术
现有的投射式车灯照明***一般由光源1、反射镜2、遮光板3及光学透镜4组成。
如图1所示，反射镜2通常为类抛物面反射面，具有近焦点及远焦点，所述光源1设置在近焦点处，光源1发出的近似朗伯型发散的光经过反射镜2反射后汇聚至反射镜2的远焦点处，所述远焦点设置在光学透镜4的焦点附近，遮光板3的遮光结构3a同样设置在光学透镜4的焦点附近，遮光结构3a的形状根据所需明暗截止线的形状而确定，汇聚至光学透镜4的焦点附近的光线中的一部分被遮光板3的遮光结构3a遮挡，形成暗区，其余大部分光线经过透镜4折射到路面形成照明。所以遮光板3的遮光结构3a是传统投射单元用于近光灯时形成明暗截止线的重要机理。
然而，由于采用类椭球面的双焦点反射镜，所以其纵深尺寸较大，导致整体占用空间也较大，不利于车灯的扁平化设计。而车灯的扁平化设计具有很大优点，且正成为一种发展趋势。因扁平化设计有利于减少灯具占用空间，对于新能源汽车，由于没有发动机，其发动机舱改为行李箱，扁平化设计还有助于增加行李箱容积。
另外，现有投射式车灯照明***组成零件较多，由此导致的零件装配关系复杂，以及因零件制造误差及总成装配误差的存在，导致产品性能波动较大。例如，左、右灯亮度不一致，导致客户抱怨，制造成本也相对较高；
另外，由于现有投射式车灯照明***组成零件较多(例如，现有投射式车灯照明***必不可少反光镜及遮光板)，还会导致照明***重量较大、装配关系复 杂、累积误差大等缺陷。
由上可知，现有投射式车灯照明***的问题如下：
采用遮光板3的遮光结构(明暗截止线)3a导致现有投射式车灯照明***的光效降低；
由于采用类椭球面的双焦点反射镜，所以其纵深尺寸较大，导致整体占用空
间也较大，不利于车灯的扁平化设计。
现有投射式车灯照明***组成零件较多，由此导致的零件装配关系复杂，以及因零件制造误差及总成装配误差的存在，导致照明***重量较大、装配关系复杂、累积误差大，导致产品性能波动。
发明内容
为解决上述问题，本发明的目的是提供一种新型汽车近光灯用投射单元及其车灯，首要的是实现一种具有明暗截止线要求的汽车近光灯用投射单元及其车灯，所述车灯具有如近光照明及雾灯等功能的同时，实现车灯的扁平化设计，所述投射单元的光源、反光板及光学透镜的具体的结构及其连接及设置可用于取代以往技术所必须的反光镜及遮光板。
其次，本发明的目的还在于提供一种新型汽车近光灯用投射单元及其车灯，所述汽车近光灯用投射单元及其车灯可实现一种具有明暗截止线要求的近光照明及雾灯等车灯功能，同时，也可以实现没有明暗截止线要求的车灯功能，如远光、日间行车灯、位置灯、制动灯、倒车灯、转向灯等功能。所述投射单元的光源、反光板及光学透镜的具体的结构及其连接及设置可用于取代以往技术所必须的反光镜及遮光板，由此，大大减小车灯体积及空间，由此较少因零件制造误差及总成装配误差的存在而导致的产品性能波动。
本发明的汽车近光灯用投射单元技术方案如下：
一种汽车近光灯用投射单元，包括光源及近光灯出射方向的光学透镜，其特征在于：
光源光轴方向设置有反光板，反光板反射光经过光学透镜照射到路面，
所述反光板具有与车灯***照明光形所要求的明暗截止线形状相对应的反光边界，以取代遮光板及其边界，所述反光板的反光边界设置在光学透镜焦点处或附近，
通过所述光源照亮反光板，经反光板反射的光线形成初步的照明光形，再通
过光学透镜照射到路面，形成最终的具有明暗截止线的二次光形。
根据光源发光特性，通过反射面曲率设定控制所述二次光形的照明光形光强
分布，使得所述二次光形随距明暗截止线拐点的距离接近，其光强增大。
根据本发明所述一种汽车近光灯用投射单元，其特征在于：
所述光源优选面光源，优选的是LED。
根据本发明所述一种汽车近光灯用投射单元，其特征在于：
所述反光板反射面呈弧形，反光板反光边界位于反光板上端。
根据本发明所述一种汽车近光灯用投射单元，其特征在于：
所述反光板反射面呈弧形，反光板的反光边界位于反光板下端(如图11、12、13所示)。
根据本发明所述一种汽车近光灯用投射单元，其特征在于：
所述反光板的反光边界设置在距离透镜焦点0-5mm处。
根据本发明所述一种汽车近光灯用投射单元，其特征在于：
经所述反光板的反光边界反射的光线以接近水平的角度照射到透镜入射面。
根据本发明所述一种汽车近光灯用投射单元，其特征在于：
所述反光板反射率不小于80％。
根据本发明所述一种汽车近光灯用投射单元，其特征在于：
所述反光板材料通过表面处理，如表面镀铝来实现反射率。
根据本发明所述一种汽车近光灯用投射单元，其特征在于：
在光源及反光板之间增加二次配光件，起到聚集光线或改变光能分布，提高光效的作用。
根据本发明所述一种汽车近光灯用投射单元，其特征在于：
所述反光板选自平面反光镜、曲面反光镜及由多曲面镜连接而成的反光镜。
根据本发明所述一种汽车近光灯用投射单元，其特征在于：
设置于光源及反光板之间的二次配光件选自凸透镜、透明光导体或反射镜。
如图7、8所示，设置于光源及反光板之间的二次配光件为凸透镜，以提高光强。又如如图10所示，设置于光源及反光板之间的二次配光件为反射镜用于提高光效。
根据本发明一种车灯，采用如上所述所述的汽车近光灯用投射单元。
根据本发明，所述投射单元的光源、反光板及光学透镜的具体的结构及其连接及设置可用于取代以往技术所必须的反光镜及遮光板，由此，大大减小车灯提 交及空间，由此较少因零件制造误差及总成装配误差的存在而导致的产品性能波动。
根据本发明，所述投射单元的光源、反光板及光学透镜的具体的结构及其连接及设置可用于取代以往技术所必须的反光镜及遮光板，由此，所述车灯具有如近光照明及雾灯等功能的同时，大大减小车灯体积及空间，实现车灯的扁平化设计。同时，所述投射单元的光源、反光板及光学透镜的具体的结构及其连接及设置可用于取代以往技术所必须的反光镜及遮光板，并减少
因零件制造误差及总成装配误差的存在而导致的产品性能波动。
附图说明
图1是传统车灯投射单元的结构示意图；
图2是传统车灯投射单元的发光示意图；
图3A为本发明的汽车近光灯用投射单元的光路示意图；
图3B为本发明的汽车近光灯用投射单元的透镜一侧的正视图；
[根据细则91更正 20.06.2019]　
图4是本发明的汽车近光灯用投射单元的近光光路示意图；
图5是本发明汽车近光灯用投射单元的近光照明光路示意图；
图6A是本发明汽车近光灯用投射单元反光板的设置状态示意图；
图6B是图6A所示本发明汽车近光灯用投射单元反光板的左视示意图，
图6C是图6A所示汽车近光灯用投射单元反光板的反射面俯视图；
图7A为本发明的汽车近光灯用投射单元在光源及反光板之间增加二次配光件的示意图；
图7B为图7A的汽车近光灯用投射单元的透镜一侧的正视图；
图7C为图7B的汽车近光灯用投射单元左视图；
图8为图7A的汽车近光灯用投射单元在光源及反光板之间增加二次配光件的光路示意图；
图9A为本发明的汽车近光灯用投射单元在光源及反光板之间增加二次配光件的又一例示意图；
图9B为图9A的汽车近光灯用投射单元的透镜一侧的正视图；
图9C为图9B的汽车近光灯用投射单元左视图；
图10为图9A的汽车近光灯用投射单元在光源及反光板之间增加二次配光件的又一例光路示意图；
图11为反光板的反光边界位于反光板下端示意图；
图12为反光板的反光边界位于反光板下端的一例光路示意图；
图13A,图13B,图13C分别为反光板的反光边界位于反光板下端的正视图、左视图及俯视图。
图中，1-LED发光芯片线路板，2-反射镜，3-遮光板，3a-遮光板截止线，4-光学透镜，5-反光板,5a-反光板反光边界的明暗截止线，6-二次配光镜。
反光板反光边界与车灯***照明光形所要求的明暗截止线形状相对应。
具体实施方式
下面结合附图和具体的实施例对本发明作进一步详细的说明。
实施例1
一种汽车近光灯用投射单元，包括光源及光学透镜，设置有反光板，所述反光板上侧边界具有与车灯***照明光形所要求的明暗截止线形状相对应的边界，以取代遮光板及其边界，所述反光板的反光边界设置在光学透镜焦点处。所述光源为LED面光源。通过所述光源照亮反光板，经反光板反射的光线形成初步的照明光形，再通过光学透镜照射到路面，形成最终的具有明暗截止线的照明光形。
投射单元的光源光轴相对于反光板法线偏斜角为45设置。光源斜下方45度设置有反光板，反光板反射面呈弧形，所述反光板材料表面镀铝来实现不小于80％的反射率。反光板的反光边界位于反光板上端，投射单元的光源光轴平行反光板法线。反光板反射光平行于光学透镜光轴照射到路面。
根据光源发光特性，通过反射面曲率设定控制所述二次光形的照明光形光强分布，使得所述二次光形随距明暗截止线拐点的距离接近，其光强增大。
根据本实施例，通过所述光源照亮反光板，经反光板反射的光线形成初步的照明光形，再通过光学透镜照射到路面，形成最终的具有明暗截止线的照明光形。
实施例2
除了以下不同之处外，其他如同实施例1：
在光源及反光板之间增加二次配光件，二次配光件为凸透镜及反射镜，起到聚集光线或改变光能分布，提高光效的作用。
实施例3
除了以下不同之处外，其他如同实施例1：
所述反光板的反光边界设置在距离透镜焦点0-5mm处。
实施例4
除了以下不同之处外，其他如同实施例1：
所述反光板的反光边界位于反光板下端，如图11、12、13所示。
根据本发明，所述投射单元的光源、反光板及光学透镜的具体的结构及其连接及设置可用于取代以往技术所必须的反光镜及遮光板，由此，所述车灯具有如近光照明及雾灯等功能的同时，大大减小车灯提交及空间，实现车灯的扁平化设计。同时，所述投射单元的光源、反光板及光学透镜的具体的结构及其连接及设置可用于取代以往技术所必须的反光镜及遮光板，并减少
因零件制造误差及总成装配误差的存在而导致的产品性能波动。

Claims (11)

  1. 一种汽车近光灯用投射单元，包括光源及近光灯出射方向的光学透镜，其特征在于：
    光源光轴方向设置有反光板，反光板反射光经过光学透镜照射到路面，
    所述反光板具有与车灯***照明光形所要求的明暗截止线形状相对应的反光边界，以取代遮光板及其边界，所述反光板的反光边界设置在光学透镜焦点处或附近，
    通过所述光源照亮反光板，经反光板反射的光线形成初步的照明光形，再通过光学透镜照射到路面，形成最终的具有明暗截止线的二次光形。
  2. 如权利要求1所述一种汽车近光灯用投射单元，其特征在于：
    所述光源优选面光源，优选的是LED。
  3. 如权利要求1所述一种汽车近光灯用投射单元，其特征在于：
    所述反光板反射面呈弧形，反光板反光边界位于反光板上端。
  4. 如权利要求1所述一种汽车近光灯用投射单元，其特征在于：
    所述反光板反射面呈弧形，反光板的反光边界位于反光板下端。
  5. 如权利要求1所述一种汽车近光灯用投射单元，其特征在于：
    所述反光板的反光边界设置在距离透镜焦点0-5mm处。
  6. 如权利要求1所述一种汽车近光灯用投射单元，其特征在于：
    经所述反光板的反光边界反射的光线以接近水平的角度照射到透镜入射面。
  7. 如权利要求1所述一种汽车近光灯用投射单元，其特征在于：
    所述反光板反射率不小于80％。
  8. 如权利要求1所述一种汽车近光灯用投射单元，其特征在于：
    在光源及反光板之间增加二次配光件，起到聚集光线或改变光能分布，提高光效的作用。
  9. 如权利要求1所述一种汽车近光灯用投射单元，其特征在于：
    所述反光板选自平面反光镜、曲面反光镜及由多曲面镜连接而成的反光镜。
  10. 如权利要求8所述一种汽车近光灯用投射单元，其特征在于：
    设置于光源及反光板之间的二次配光件选自凸透镜、透明光导体或反射镜。
  11. 一种车灯，采用如权利要求1-10任一项所述的汽车近光灯用投射单元。
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