WO2020029022A1 - 背光灯 - Google Patents

背光灯 Download PDF

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Publication number
WO2020029022A1
WO2020029022A1 PCT/CN2018/099007 CN2018099007W WO2020029022A1 WO 2020029022 A1 WO2020029022 A1 WO 2020029022A1 CN 2018099007 W CN2018099007 W CN 2018099007W WO 2020029022 A1 WO2020029022 A1 WO 2020029022A1
Authority
WO
WIPO (PCT)
Prior art keywords
light guide
light
guide cover
backlight
light source
Prior art date
Application number
PCT/CN2018/099007
Other languages
English (en)
French (fr)
Inventor
伽斯纳·克里斯汀
Original Assignee
炼马机电（东莞）有限公司
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 炼马机电（东莞）有限公司 filed Critical 炼马机电（东莞）有限公司
Priority to PCT/CN2018/099007 priority Critical patent/WO2020029022A1/zh
Priority to CN201880017210.8A priority patent/CN110476006B/zh
Publication of WO2020029022A1 publication Critical patent/WO2020029022A1/zh

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Classifications

    • 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
    • F21K9/20—Light sources comprising attachment means
    • 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
    • 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
    • F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
    • 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 application relates to the technical field of LED (Light Emitting Diode, light emitting diode) lamps, and particularly to a backlight.
  • LED Light Emitting Diode, light emitting diode
  • the backlight includes a light source and a light guide surface shell, and the light emitted by the light source is transmitted in the light guide surface shell made of a light-transmitting material, so that the pattern on the surface of the light guide surface shell can be displayed.
  • the light guide surface shell is darker or even no light at a distance from the light source, which affects the overall display effect of the backlight.
  • the main purpose of the present application is to propose a backlight, which aims to solve the problem of uneven brightness of the backlight as a whole, because the brightness of the existing backlight is relatively distant from the light source.
  • a backlight provided by the present application includes a light source and a light guide surface shell for transmitting light.
  • the light guide surface shell is made of a light-transmitting material.
  • the light guide surface shell includes a light guide cover and is disposed on the light guide cover.
  • At least one light-guiding structure in the light-guiding body, the light-guiding structure includes a light-guiding body and a refractive portion, the light-guiding body extends from the outer periphery of the light source to the light-guiding body, and the width of the light-guiding body is along the light guiding The extending direction of the main body is gradually reduced.
  • the refracting portions are disposed between two sides of the light guide body and the light guide cover. The light of the light source is refracted and reflected by the refracting portion to the light guide body.
  • the refracting part includes a plurality of light guide plates, the light guide plate extends from the side of the light guide body to the light guide cover body, and an included angle between the extension direction of the light guide plate and the extension direction of the light guide body is an acute angle.
  • the refraction portion is symmetrically disposed on both sides of the light guide body, and the plurality of light guide plates of the refraction portion on either side are disposed in parallel with each other.
  • the thickness of the light guide plate is 1.2 mm.
  • the light guide cover also includes a circular mounting station for receiving the light source, and the light source is mounted on the circular mounting station.
  • the material of the light guide surface shell includes a light-scattering powder.
  • the cross section of the light guide cover is a polygon having a first symmetry axis and a second symmetry axis, and the width of the light guide cover along the first symmetry axis is greater than the width of the light guide cover along the second symmetry axis.
  • the light guide structure is disposed along the first axis of symmetry, the extending direction of the light guide body of the light guide structure is parallel to the first axis of symmetry, and the two refractive portions of the light guide structure are disposed symmetrically on the first axis of symmetry. On both sides.
  • the light guide surface shell further includes a groove provided between the light source and the light guide cover along the second symmetry axis, and the groove is used to increase the uniformity of the light source.
  • the backlight further includes a surface sticker and a light shielding plate, the surface sticker is disposed on the upper surface of the light guide cover body, the light shielding plate is located between the light guiding surface shell and the surface sticker, and the light shielding plate is used to increase the exposure to the The uniformity of the light on the surface.
  • the upper surface of the light guide cover is provided with a recessed portion, and the surface is disposed in the recessed portion.
  • a chamfer is attached around the surface between the upper surface of the light guide cover and the outer side surface of the light guide cover. The edge of the upper surface of the surface overlay coincides with the chamfered edge.
  • a reinforcing rib is provided between the refractive portion and the groove.
  • the backlight also includes a lower case, which includes a circular assembling part and an accommodating part connected to the assembling part, and the assembling part is used to install the lower case into the circular installation station.
  • a power switch and a cable electrically connected to the light source are provided in the accommodating portion.
  • the light source includes a PCB (Printed Circuit Board, printed circuit board) and an LED lamp disposed on the PCB.
  • PCB Print Circuit Board, printed circuit board
  • a light guide structure is provided between the light source and the inner side wall of the light guide cover. Since the width of the light guide body of the light guide structure gradually decreases along the extension direction of the light guide body, the light guide body passes through the side of the light guide body. The reflection effect of the wall makes the light gradually gather in the light guide main body along the extending direction of the light guide main body, so as to increase the brightness of the light on the light guide cover body at the light guide main body extending direction. At the same time, the light is deflected to the light guide body after being refracted by the refracting portions on both sides of the light guide body, which can further enhance the brightness of the light on the light guide cover. Therefore, by setting the light guide structure, it is possible to avoid the situation that the light on the light guide cover is relatively distant or even no light at a distance from the light, thereby improving the overall display effect of the backlight.
  • FIG. 1 is a rear view of a backlight provided by an embodiment of the present application.
  • FIG. 2 is a schematic isometric view of a backlight provided in an embodiment of the present application.
  • FIG. 3 is an exploded view of a backlight provided in an embodiment of the present application.
  • FIG. 4 is a front view of a backlight provided by an embodiment of the present application.
  • the present application provides a backlight including a light source 1 and a light guide surface shell 2 for transmitting light.
  • the light guide surface shell 2 is made of a light-transmitting material, and the light guide surface shell 2 includes light guides.
  • the light guide structure 22 includes a light guide body 221 and a refractive portion.
  • the light guide body 221 extends from the outer periphery of the light source 1 to the light guide cover 21.
  • the width of the light guide body 221 gradually decreases along the extension direction of the light guide body 221.
  • the light guide 1 is disposed between two sides of the light guide body 221 and the light guide cover 21. The light from the light source 1 is refracted and reflected by the refracting part and then deflected toward the light guide body 221.
  • the light guide cover 21 is integrally formed by the upper plate 214 and a side plate 215 provided around the edge of the upper plate 214.
  • the upper plate 214 and a plurality of side plates 215 form a light receiving structure 22 and a light source 1.
  • one end of the refracting portion is connected to the side of the light guide body 221 and the other end is connected to the inner wall of the side plate 215 to increase the contact area between the refracting portion and the light, so that more light is guided by the refracting portion after being refracted.
  • the light main body 221 is deflected to further enhance the brightness of the light emitted from the light guide main body 221.
  • the refractive portion may not be in contact with the side of the light guide body 221 and the inner wall of the side plate 215, and the refractive portion only needs to be located in the accommodation space between the light guide body 221 and the side plate 215. .
  • the width of the light guide body 221 is the distance between the two sides of the light guide body 221, and the width of the light guide body 221 gradually decreases along the extension direction of the light guide body 221, which refers to the two sides of the light guide body 221.
  • the side surfaces gradually move closer along the extending direction of the light guide body 221. Specifically, the light refracted and reflected by the refracting section is deflected toward the light main body 221 and then propagates through the light guide main body 221.
  • the refractive portion includes a plurality of light guide plates 222.
  • the light guide plate 222 extends from the side of the light guide body 221 to the light guide cover 21.
  • the included angle in the extending direction of the main body 221 is an acute angle. In this way, the light is refracted by the light guide plate 222 after being refracted by the light guide body 221 to enhance the brightness of the light on the light guide cover 21.
  • the refractive portions are symmetrically disposed on both sides of the light guide body 221, and a plurality of light guide plates 222 of the refractive portions on either side are disposed in parallel with each other, so that light passes through the light guide plate 222. More uniform after refraction.
  • the thickness of the light guide plate 222 is 1.2 millimeters, so that the light guide plate 222 can meet the injection requirements of the light guide surface shell 2 while meeting the refraction requirements, and avoid cracks or bubbles in the light guide surface shell 2 during injection.
  • the inside of the light guide cover 21 further includes a circular mounting station 211 for receiving the light source 1, and the light source 1 is mounted on the circular mounting station 211 so that the light source The emitted light in the light guide surface shell 2 is more uniform to enhance the overall display effect of the backlight.
  • the center of the light source 1 is located on the central axis of the circular mounting station 211, so that the emitted light can be more uniform.
  • the material of the light-guiding surface shell 2 includes a diffusing powder.
  • a diffusing powder By adding astigmatism powder to the injection molding material and utilizing the scattering characteristics of the astigmatism powder, the uniformity of light propagation is enhanced, so that the overall brightness of the light guide surface shell 2 is more uniform.
  • the cross section of the light guide cover 21 is a polygon having a first symmetry axis and a second symmetry axis, and the width of the light guide cover 21 along the first symmetry axis.
  • the light guide cover 21 is wider than the width of the light guide cover 21 along the second symmetry axis.
  • the light guide structure 22 is disposed along the first symmetry axis.
  • the extension direction of the light guide body 221 of the light guide structure 22 is parallel to the first symmetry axis.
  • the refraction portions are symmetrically disposed on both sides of the first axis of symmetry, and the light guide body 221 and the plurality of light guide plates 222 form a structure similar to a leaf vein.
  • the cross section refers to a cross section parallel to the upper surface of the light guide cover 21.
  • the light guide structure 22 may also be disposed at a position other than the first axis of symmetry, thereby improving the brightness of the light at other positions on the light guide cover 21, and only the position where the brightness enhancement is required is located in the extending direction of the light guide body 221 Just go.
  • the cross section of the light guide cover 21 is hexagonal, and two points farthest from the light source 1 are located on the first axis of symmetry. Since the brightness of each point on the light guide cover 21 decreases as its distance from the light source 1 increases, the two light guide structures 22 are respectively arranged on the first axis of symmetry, so that the two furthest points are located on the light guide The light body 221 extends in the direction to enhance the brightness of the light at the two furthest points. In this way, the situation where the light is dim or even no light at the two furthest points can be avoided.
  • the light guide surface shell 2 further includes a groove 23 disposed between the light source 1 and the light guide cover 21 along the second axis of symmetry.
  • the groove 23 is provided between the outer side wall of the circular mounting station 211 and the inner side wall of the side plate 215.
  • the grooves 23 can prevent bright spots from appearing on the light guide cover 21 at two sides closer to the light source 1, thereby increasing the uniformity of the overall brightness of the light guide cover 21.
  • the groove 23 can also reduce the material thickness of the light guide cover body 21 in the light emission direction, and avoid shrinkage of the light guide surface shell 2 during molding.
  • the backlight further includes a face sticker 4 and a light shielding plate 5.
  • the face sticker 4 is disposed on the upper surface of the light guide cover 21, and the face sticker 4 is provided with a display to be displayed.
  • Pattern, the light-shielding plate 5 is located between the light guide surface shell 2 and the surface sticker 4.
  • the light-shielding plate 5 is used to increase the uniformity of the light irradiated to the surface sticker 4, which can prevent the light source 1 from being small and the pattern to be displayed larger In the case of the light source, the pattern is very bright and the surrounding area is dark.
  • the upper surface of the light guide cover 21 is provided with a recessed portion 212, and the surface sticker 4 is disposed in the recessed portion 212.
  • the upper surface of the light guide cover 21 and the light guide A chamfer 213 is provided around the surface sticker 4 between the outer surfaces of the cover body 21.
  • the edge of the upper surface of the surface sticker 4 coincides with the edge of the chamfer 213.
  • the upper plate 214 and the side plate 215 of the light guide cover 21 are transitionally connected through the chamfer 213.
  • the chamfer 213 is a chamfer. In other embodiments, the chamfer 213 may be a chamfer. In this way, when the light source 1 is lit, the ring-shaped chamfer 213 partially transmits light, and the diaphragm is formed by surrounding the surface sticker 4, which enhances the overall aesthetics of the backlight.
  • a reinforcing rib 3 is provided between the refractive portion and the groove 23.
  • the ribs 3 are arranged in parallel with the light guide plate 222.
  • the ribs 3 can effectively enhance the strength of the light guide surface shell 2 and on the other hand, they can refract the light with the light guide plate 222, so that the light is deflected to the light guide body 221 Therefore, the light intensity of the light guide cover 21 at a position in the extending direction of the light guide body 221 is enhanced.
  • the backlight further includes a lower case 6, and the lower case 6 includes a circular mounting portion 61 and an accommodating portion 62 connected to the mounting portion 61.
  • the mounting portion 61 is used to install the lower casing 6 into the circular mounting station 211, and the accommodating portion 62 is provided with a power switch 7 and a cable 8 which are electrically connected to the light source 1.
  • the light source 1 includes a PCB 11 and an LED lamp 12 disposed at a central portion of the PCB 11.
  • the LED is first mounted on the PCB11, and then the PCB11 is mounted on the lower case 6, so that the installation of the PCB11 is not restricted by the conversion of the light guide surface shell 2, and it is convenient to replace the light guide surface shell 2 of the other models. Effective cost savings.
  • a light guide structure 22 is provided between the light source 1 and the inner side wall of the light guide cover 21. Since the width of the light guide body 221 of the light guide structure 22 gradually decreases along the extending direction of the light guide body 221, Through the reflection effect of the side wall of the light guide body 221, the light is gradually gathered in the light guide body 221 along the extension direction of the light guide body 221, so as to increase the brightness of the light on the light guide cover 21 at the direction where the light guide body 221 extends. . At the same time, the light is deflected toward the light guide body 221 after being refracted by the refracting portions on both sides of the light guide body 221, which can further enhance the brightness of the light on the light guide cover 21. Therefore, by providing the light guide structure 22, it is possible to prevent the light on the light guide cover 21 from being distant or even no light at a distance from the light, thereby improving the overall display effect of the backlight.

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Abstract

本申请涉及一种背光灯，包括光源及传输光线的导光面壳，导光面壳由透光材料制成，导光面壳包括导光罩体及设置于导光罩体内的至少一个导光结构，导光结构包括导光主体及折射部，导光主体由光源延伸至导光罩体，导光主体的宽度沿导光主体的延伸方向逐渐减小，折射部设置于导光主体的两侧与导光罩体之间，光源的光线经折射部折射后向导光主体偏折。如此，通过折射部的折射作用及导光主体的反射作用，光线向导光主体的延伸方向汇聚，从而增强导光罩体上位于所述导光主体的延伸方向处的光线亮度，避免导光罩体上距离光源较远处出现光线较暗甚至无光的情况，从而改善背光灯的整体显示效果。

Description

背光灯 技术领域
本申请涉及LED(Light Emitting Diode，发光二极管)灯具技术领域，特别是涉及一种背光灯。
 背景技术
随着LED技术的不断发展，市面上出现了各种LED产品，例如用于非自发光型图像显示的背光灯。
该背光灯包括光源及导光面壳，光源发出的光在由透光材料制成的导光面壳中传输，以使得导光面壳表面的图案得以显示。
 技术问题
但是，由于导光面壳上各点与光源的距离不一致，使得导光面壳在距离光源较远的位置亮度较暗，甚至无光，从而影响背光灯的整体显示效果。
 技术解决方案
本申请的主要目的是提出一种背光灯，旨在解决现有背光灯由于距离光源较远位置亮度较暗而导致背光灯整体亮度不均的问题。
为实现上述目的，本申请提出的一种背光灯，包括光源及传输光线的导光面壳，该导光面壳由透光材料制成，该导光面壳包括导光罩体及设置于该导光罩体内的至少一个导光结构，该导光结构包括导光主体及折射部，该导光主体由该光源的外周延伸至该导光罩体，该导光主体的宽度沿导光主体的延伸方向逐渐减小，该折射部设置于该导光主体的两侧与该导光罩体之间，该光源的光线经该折射部折射以及反射后向该导光主体偏折。
该折射部包括多个导光板，该导光板由该导光主体的侧面向该导光罩体延伸，该导光板的延伸方向与该导光主体的延伸方向的夹角为锐角。
该折射部对称设置于该导光主体的两侧，任意一侧的该折射部的多个该导光板相互平行设置。
该导光板的厚度为1.2毫米。
该导光罩体内侧还包括用于容纳该光源的圆形安装工位，该光源安装于该圆形安装工位上。
该导光面壳的材料包括散光粉。
该导光罩体的横截面为具有第一对称轴及第二对称轴的多边形，该导光罩体沿该第一对称轴的宽度大于该导光罩体沿该第二对称轴的宽度，该导光结构沿该第一对称轴设置，该导光结构的该导光主体的延伸方向与该第一对称轴平行，该导光结构的两个该折射部对称设置于该第一对称轴的两侧。
该导光面壳还包括沿该第二对称轴设置于该光源与该导光罩体之间的凹槽，该凹槽用于增加该光源的均匀性。
该背光灯还包括面贴及遮光板，该面贴设置于该导光罩体的上表面，该遮光板位于该导光面壳与该面贴之间，该遮光板用于增加照射至该面贴的光线的均匀性。
该导光罩体的上表面设有凹陷部，该面贴设置于该凹陷部内，该导光罩体的上表面与该导光罩体的外侧面之间环绕该面贴设有倒角，该面贴的上表面的边缘与该倒角的边缘重合。
该折射部与该凹槽之间设有加强筋。
该背光灯还包括下壳体，该下壳体包括圆形的装配部及与该装配部相接的容置部，该装配部用于将该下壳体安装至该圆形安装工位内，该容置部内设有与该光源电连接的电源开关及线缆。
该光源包括PCB(Printed Circuit Board，印制电路板)及设置于该PCB上的LED灯。
 有益效果
本申请的背光灯，在光源与导光罩体的内侧壁之间设置导光结构，由于导光结构的导光主体的宽度沿导光主体的延伸方向逐渐减小，通过导光主体的侧壁的反射作用，使得光线在导光主体内沿导光主体的延伸方向逐渐收拢，以增加导光罩体上位于导光主体延伸方向处的光线亮度。同时，光线经过导光主体两侧的折射部折射后向导光主体偏折，可以进一步增强导光罩体上的光线亮度。因此，通过设置导光结构，可以避免导光罩体上距离光线较远处出现光线较暗甚至无光的情况，从而改善背光灯的整体显示效果。
 附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他实施例的附图。
图1为本申请一实施例提供的背光灯的后视图；
图2为本申请一实施例提供的背光灯的轴测示意图；
图3为本申请一实施例提供的背光灯的爆炸示意图；
图4为本申请一实施例提供的背光灯的主视图。
附图标号说明：
1、光源；11、PCB；12、LED灯；
2、导光面壳；
21、导光罩体；211、圆形安装工位；212、凹陷部；213、倒角；214、上板；215、侧板；
 22、导光结构；221、导光主体；222、导光板；23、凹槽；
3、加强筋；
4、面贴；
5、遮光板；
6、下壳体；61、装配部；62、容置部；
7、电源开关；
8、线缆。
 本发明的实施方式
为了便于理解本申请，下面将参照相关附图对本申请进行更全面的描述。附图中给出了本申请的较佳实施方式。但是，本申请可以以许多不同的形式来实现，并不限于本文所描述的实施方式。相反地，提供这些实施方式的目的是使对本申请的公开内容理解的更加透彻全面。
需要说明的是，当元件被称为“固定于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“内”、“外”、“左”、“右”以及类似的表述只是为了说明的目的，并不表示是唯一的实施方式。
如图1至图4所示，本申请提供一种背光灯，包括光源1及传输光线的导光面壳2，导光面壳2由透光材料制成，导光面壳2包括导光罩体21及设置于导光罩体21内侧的至少一个导光结构22。导光结构22包括导光主体221及折射部，导光主体221由光源1的外周延伸至导光罩体21，导光主体221的宽度沿导光主体221的延伸方向逐渐减小，折射部设置于导光主体221的两侧与导光罩体21之间，光源1的光线经折射部折射以及反射后向导光主体221偏折。
在本实施例中，导光罩体21由上板214及环绕上板214边缘设置的侧板215一体成型，上板214与多块侧板215形成用于容纳导光结构22及光源1的容置空间。优选的，折射部的一端与导光主体221的侧面相接，另一端与侧板215的内壁相接，以增加折射部与光线的接触面积，从而使更多的光线经折射部折射后向导光主体221偏折，进而增强导光主体221的出射光线的亮度。在其他实施例中，折射部也可以不与导光主体221的侧面及侧板215的内壁相接，只需使折射部位于导光主体221与侧板215之间的容置空间内即可。
可以理解的，导光主体221的宽度是指导光主体221的两侧面之间的距离，导光主体221的宽度沿导光主体221的延伸方向逐渐减小，指的是导光主体221的两侧面沿导光主体221的延伸方向逐渐靠拢。具体的，经折射部折射及反射后的光线向导光主体221偏折，然后在导光主体221中传播。光线在导光主体221内向导光罩体21射出的过程中，由于导光主体221的侧面的反射作用，光线在导光主体221内向导光主体221的延伸方向汇聚，从而增强导光罩体21上位于导光主体221的延伸方向上的位置处的光线强度。在一实施例中，如图1及图2所示，折射部包括多个导光板222，导光板222由导光主体221的侧面向导光罩体21延伸，导光板222的延伸方向与导光主体221的延伸方向的夹角为锐角。如此，光线经导光板222折射后向导光主体221偏折，以增强导光罩体21上的光线亮度。
在一实施例中，如图1及图2所示，折射部对称设置于导光主体221的两侧，任意一侧的折射部的多个导光板222相互平行设置，使得光线经导光板222折射后更加均匀。
优选的，导光板222的厚度为1.2毫米，使得导光板222在满足折射要求的同时，也能满足导光面壳2的注塑要求，避免导光面壳2在注塑时产生裂痕或气泡。
在一实施例中，如图1及图2所示，导光罩体21内侧还包括用于容纳光源1的圆形安装工位211，光源1安装于圆形安装工位211上，使得光源1在导光面壳2中的出射光线更加均匀，以增强背光灯的整体显示效果。
优选的，光源1的中心位于圆形安装工位211的中心轴上，可以使出射光线更加均匀。
优选的，导光面壳2的材料包括散光粉。通过在注塑材料中添加散光粉，利用散光粉的散射特性，增强了光线传播的均匀性，使得导光面壳2整体的亮度更加均匀。
在一实施例中，如图1及图2所示，导光罩体21的横截面为具有第一对称轴及第二对称轴的多边形，，导光罩体21沿第一对称轴的宽度大于导光罩体21沿第二对称轴的宽度，导光结构22沿第一对称轴设置，导光结构22的导光主体221的延伸方向与第一对称轴平行，导光结构22的两个折射部对称设置于第一对称轴的两侧，导光主体221和多个导光板222形成类似树叶的叶脉的构造。
具体的，该横截面指的是与导光罩体21的上表面平行的截面。通过在第一对称轴上对称设置导光结构22，通过导光板222的折射作用以及导光主体221的反射作用，使得光线向第一对称轴汇聚，从而增强导光罩体21上位于第一对称轴两端的位置处的光线亮度，避免导光罩体21距离光线较远处出现光线较暗甚至无光的情况，使得导光罩体21整体的亮度更加均匀。当然，导光结构22也可以设置在除第一对称轴以外的其他位置，从而改善导光罩体21上其余位置的光线亮度，只需使得需要增强亮度的位置位于导光主体221的延伸方向上即可。
在本实施例中，导光罩体21的横截面为六边形，距离光源1最远的两点位于第一对称轴上。由于导光罩体21上各点的亮度随其与光源1的距离的增加而减弱，，因此，将两个导光结构22分别设置在第一对称轴上，从而使得两最远点位于导光主体221的延伸方向上，以增强两最远点处的光线亮度。如此，可以避免两最远点处出现光线较暗甚至无光的情况。
在一实施例中，如图1及图2所示，导光面壳2还包括沿第二对称轴方向设置于光源1与导光罩体21之间的凹槽23。具体的，凹槽23设置于圆形安装工位211的外侧壁与侧板215的内侧壁之间。该凹槽23可以避免导光罩体21上距离光源1较近的两侧出现亮斑，从而增加导光罩体21整体亮度的均匀性。此外，该凹槽23还可降低导光罩体21沿光线出射方向的材料厚度，避免导光面壳2在成型时出现缩水。
在一实施例中，如图3及图4所示，背光灯还包括面贴4及遮光板5，面贴4设置于导光罩体21的上表面，面贴4上设有需要显示的图案，遮光板5位于导光面壳2与面贴4之间，遮光板5用于增加照射至面贴4的光线的均匀性，可以避免在光源1很小而想要显示的图案较大的情况下，出现图案正对光源1处很亮，而周边较暗的现象。
在一实施例中，如图3及图4所示，导光罩体21的上表面设有凹陷部212，面贴4设置于凹陷部212内，导光罩体21的上表面与导光罩体21的外侧面之间环绕面贴4设有倒角213。面贴4的上表面的边缘与倒角213的边缘重合。具体的，导光罩体21的上板214与侧板215通过该倒角213过渡连接。
在本实施例中，该倒角213为倒斜角，在其他实施例中，该倒角213也可以为倒圆角。如此，当光源1被点亮后，环形倒角213部分透光，以环绕面贴4形成光圈，增强了背光灯整体的美观性。
在一实施例中，如图1及图2所示，折射部与凹槽23之间设有加强筋3。优选的，加强筋3与导光板222平行设置，加强筋3一方面可以有效增强导光面壳2的强度，另一方面可以与导光板222共同对光线折射，使得光线向导光主体221偏折，从而增强导光罩体21上位于导光主体221的延伸方向的位置的光线强度。
在一实施例中，如图3及图4所示，背光灯还包括下壳体6，下壳体6包括圆形的装配部61及与装配部61相接的容置部62，装配部61用于将下壳体6安装至圆形安装工位211内，容置部62内设有与光源1电连接的电源开关7及线缆8。
通过设置下壳体6，当导光面壳2的外形需要作出改变时，仅需保持导光面壳2下端安装光源1的圆形安装工位211处的结构不变，就可以使各型号的背光灯共用除导光面壳2外的其余零部件，可以有效节约成本。
在一实施例中，如图3所示，光源1包括PCB11及设置于PCB11中心部的LED灯12。装配过程中，首先将LED安装至PCB11上，然后再将PCB11安装至下壳体6上，使得PCB11的安装不受导光面壳2变换的限制，便于更换其余型号的导光面壳2，有效节约成本。
本申请的背光灯，在光源1与导光罩体21的内侧壁之间设置导光结构22，由于导光结构22的导光主体221的宽度沿导光主体221的延伸方向逐渐减小，通过导光主体221的侧壁的反射作用，使得光线在导光主体221内沿导光主体221的延伸方向逐渐收拢，以增加导光罩体21上位于导光主体221延伸方向处的光线亮度。同时，光线经过导光主体221两侧的折射部折射后向导光主体221偏折，可以进一步增强导光罩体21上的光线亮度。因此，通过设置导光结构22，可以避免导光罩体21上距离光线较远处出现光线较暗甚至无光的情况，从而改善背光灯的整体显示效果。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对申请专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。

Claims (13)

  1. 一种背光灯，包括光源及传输光线的导光面壳，所述导光面壳由透光材料制成，其特征在于，所述导光面壳包括导光罩体及设置于所述导光罩体内的至少一个导光结构；
    所述导光结构包括导光主体及折射部，所述导光主体由所述光源的外周延伸至所述导光罩体，所述导光主体的宽度沿所述导光主体的延伸方向逐渐减小，所述折射部设置于所述导光主体的两侧与所述导光罩体之间，所述光源的光线经所述折射部折射以及反射后向所述导光主体偏折。
  2. 如权利要求1所述的背光灯，其特征在于，所述折射部包括多个导光板，所述导光板由所述导光主体的侧面向所述导光罩体延伸，所述导光板的延伸方向与所述导光主体的延伸方向的夹角为锐角。
  3. 如权利要求2所述的背光灯，其特征在于，所述折射部对称设置于所述导光主体的两侧，任意一侧的所述折射部的多个所述导光板相互平行设置。
  4. 如权利要求3所述的背光灯，其特征在于，所述导光板的厚度为1.2毫米。
  5. 如权利要求1所述的背光灯，其特征在于，所述导光罩体内侧还包括用于容纳所述光源的圆形安装工位，所述光源安装于所述圆形安装工位上。
  6. 如权利要求1-5任意一项所述的背光灯，其特征在于，所述导光面壳的材料包括散光粉。
  7. 如权利要求6所述的背光灯，其特征在于，所述导光罩体的横截面为具有第一对称轴及第二对称轴的多边形，所述导光罩体沿所述第一对称轴的宽度大于所述导光罩体沿所述第二对称轴的宽度，所述导光结构沿所述第一对称轴设置，所述导光结构的所述导光主体的延伸方向与所述第一对称轴平行，所述导光结构的两个所述折射部对称设置于所述第一对称轴的两侧。
  8. 如权利要求7所述的背光灯，其特征在于，所述导光面壳还包括沿所述第二对称轴方向设置于所述光源与所述导光罩体之间的凹槽，所述凹槽用于增加所述光源的均匀性。
  9. 如权利要求1所述的背光灯，其特征在于，所述背光灯还包括面贴及遮光板，所述面贴设置于所述导光罩体的上表面，所述遮光板位于所述导光面壳与所述面贴之间，所述遮光板用于增加照射至所述面贴的光线的均匀性。
  10. 如权利要求9所述的背光灯，其特征在于，所述导光罩体的上表面设有凹陷部，所述面贴设置于所述凹陷部内，所述导光罩体的上表面与所述导光罩体的外侧面之间环绕所述面贴设有倒角，所述面贴的上表面的边缘与所述倒角的边缘重合。
  11. 如权利要求8所述的背光灯，其特征在于，所述折射部与所述凹槽之间设有加强筋。
  12. 如权利要求5所述的背光灯，其特征在于，所述背光灯还包括下壳体，所述下壳体包括圆形的装配部及与所述装配部相接的容置部，所述装配部用于将所述下壳体安装至所述圆形安装工位内，所述容置部内设有与所述光源电连接的电源开关及线缆。
  13. 如权利要求1所述的背光灯，其特征在于，所述光源包括PCB及设置于所述PCB上的LED灯。
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