WO2021103703A1 - 一种分段式导光体及具有其的舞台灯 - Google Patents

一种分段式导光体及具有其的舞台灯 Download PDF

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Publication number
WO2021103703A1
WO2021103703A1 PCT/CN2020/111813 CN2020111813W WO2021103703A1 WO 2021103703 A1 WO2021103703 A1 WO 2021103703A1 CN 2020111813 W CN2020111813 W CN 2020111813W WO 2021103703 A1 WO2021103703 A1 WO 2021103703A1
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Prior art keywords
light guide
light
guide section
section
segmented
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PCT/CN2020/111813
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English (en)
French (fr)
Inventor
蒋伟楷
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广州市浩洋电子股份有限公司
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Publication of WO2021103703A1 publication Critical patent/WO2021103703A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • 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
    • F21V2200/10—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of the optical fibres type
    • 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 the technical field of lighting, and more specifically, to a segmented light guide and a stage light having the same.
  • various condensing elements are generally used, such as reflectors, light guides, and condensers.
  • the reflectors are mainly used to condense the light emitted by the bubble lamp.
  • the body and condenser are mainly used to converge the light emitted by the LED lamp beads. Since most of the LED lamp beads are square, in order to better collect light, the light incident surface of the light guide also tends to be square as much as possible. For traditional light guides, most of the cross-sectional shapes from the light entrance surface to the light exit surface remain unchanged.
  • the light entrance surface is a square and the light exit surface is also a square light guide, or the light entrance surface is a regular hexagon and the light exit surface is also a regular hexagon. shape.
  • This will cause the emitted beam to have a square or regular hexagonal spot in the direction perpendicular to the optical path.
  • it is generally required that the emitted beam in the direction perpendicular to the optical path tends to be circular, and the brightness of the projected spot is required.
  • the color is uniform, and there can be no obvious bright or dark areas. Therefore, a small part of the light guide has different shapes of the light exit surface and the light entrance surface to ensure the light receiving effect and the shape of the light spot, but the light mixing effect of these light guides on the light emitted by the LED lamp beads is not ideal.
  • the present invention provides a segmented light guide by adjusting the ratio of the first light guide section to the second light guide section, so that the It can not only achieve the ideal spot shape, but also have a better light mixing effect.
  • the technical solution adopted by the present invention is: a segmented light guide body, including a first light guide section and a second light guide section, and light is transmitted from the first light guide section to the second light guide section.
  • the segmented light guide of the present invention utilizes the first light guide section with a smaller cross-sectional area to reflect the received light multiple times to achieve the purpose of light mixing, and uses the second light guide section to The beam is shaped to change the shape of the spot. Since the length ratio of the first light guide section and the second light guide section is 3:1 to 1:1, the overall length of the segmented light guide In limited circumstances, neither the first light guide section nor the second light guide section is too long or too short, so that both sufficient light mixing and ideal shaping can be achieved, and the projected light spot can be guaranteed The overall shape and brightness, uniformity of color.
  • the cross section of the first light guide section and/or the cross section of the second light guide section is a centrally symmetrical section. Since the shape of the light source is generally centrally symmetrical, the cross section of the first light guide section and/or the cross section of the second light guide section is set to be a centrally symmetrical section. The light is better mixed to make the brightness and color of the projected spot more uniform.
  • the shape of the light exit surface of the second light guide segment is more circular than the shape of the light entrance surface of the first light guide segment. Therefore, the light spot projected through the segmented light guide tends to be more circular, so as to meet the general requirements for the shape of the projected light spot in the lighting field.
  • the side walls of the first light guide section and the second light guide section have multiple edges, which are easy to process, and the number of edges of the second light guide section is greater than that of the first light guide section.
  • the number of edges of the segments tends to be more circular.
  • the light incident surface of the first light guide section is a regular quadrilateral or a regular hexagon, which conforms to the shape of a general LED lamp bead, and/or the light exit surface of the second light guide section is a regular hexagon or a regular octagon Shape or regular dodecagon, tends to be round.
  • the side wall of the first light guide section has multiple edges, which is easy to process, and the second light guide section is in the shape of a truncated cone, so that a circular light spot is projected through the segmented light guide. In order to meet the general requirements for the shape of the projected spot in the lighting field.
  • the connecting surface connecting the two adjacent edges protrudes outward to form an arc-shaped surface.
  • the arc-shaped surface is used to change the reflection direction of the light in the segmented light guide body, so that the subtle angle difference of the light can be enlarged, and the light diverges in different directions as much as possible, and the light mixing is more uniform.
  • the light exit surface of the first light guide segment is connected to the light entrance surface of the second light guide segment.
  • the structure is simple, easy to process, and the simplest structure is used to achieve the purpose of light mixing and shaping.
  • the light exit surface of the first light guide segment and the light entrance surface of the second light guide segment are circular with equal radius.
  • the cross section of the first light guide section changes from a polygon to a circle
  • the cross section of the second light guide section changes from a circle to a polygon.
  • the shape changes of the first light guide section and the second light guide section are smoothed, so as to prevent light from causing light loss during the propagation process of the first light guide section and the second light guide section.
  • the length ratio of the first light guide section to the second light guide section is 2:1.
  • the ratio is optimal, and the light mixing effect and beam shaping effect are the most ideal.
  • the ratio of the overall length of the segmented light guide to the width of the light incident surface of the first light guide section is 25:1 to 15:1. Within this ratio range, the overall length of the segmented light guide is sufficient to fully mix the light received from the light entrance surface of the first light guide section, and avoid uneven brightness and color of the emitted light spot.
  • the homogenizing section further homogenizes the light beam emitted from the second light guide section, so as to avoid uneven brightness and color of the projected light spot.
  • the present invention also provides a stage light, which includes any of the aforementioned segmented light guides.
  • Fig. 1 is a schematic structural diagram of a first embodiment of a segmented light guide of the present invention.
  • Fig. 2 is a schematic diagram of the structure of the first light guide section of the present invention.
  • Fig. 3 is a schematic diagram of the cross-sectional shape change of the first light guide section of the present invention.
  • Fig. 4 is a schematic diagram of the structure of the second light guide section of the present invention.
  • Fig. 5 is a schematic diagram of the cross-sectional shape change of the second light guide section of the present invention.
  • Fig. 6 is a schematic structural diagram of a second embodiment of a segmented light guide of the present invention.
  • Fig. 7 is a schematic structural diagram of a third embodiment of a segmented light guide of the present invention.
  • the first embodiment of the present invention provides a segmented light guide, including a first light guide section 100 and a second light guide section 200.
  • Light is transmitted from the first light guide section 100 to the The second light guide section 200, along the light path direction, that is, the direction of the light beam, the cross-sectional area of at least one of the first light guide section 100 and the second light guide section 200 gradually increases along the light path direction, and
  • the light exit surface area of the second light guide section 200 is larger than the light incident surface area of the first light guide section 100, and the length ratio of the first light guide section 100 to the second light guide section 200 is 3: 1 to 1:1.
  • the segmented light guide of the present invention utilizes the first light guide section 100 with a smaller cross-sectional area to reflect the received light multiple times to achieve the purpose of light mixing, and utilizes the second light guide section 200 shapes the light beam to change the shape of the light spot. Since the length ratio of the first light guide section 100 and the second light guide section 200 is 3:1 to 1:1, the segmented light guide In the case that the overall length of the light body is limited, neither the first light guide section 100 nor the second light guide section 200 will be too long or too short, so that both sufficient light mixing and ideal light mixing can be achieved.
  • the plastic shaping ensures the uniformity of the overall shape and brightness and color of the projected spot.
  • the cross-sectional area of the first light guide section 100 and the cross-sectional area of the second light guide section 200 gradually increase along the light path direction.
  • the cross-sectional area of the first light guide section 100 remains constant, and the cross-sectional area of the second light guide section 200 gradually increases along the optical path; or the first light guide section 200
  • the cross-sectional area of the segment 100 gradually increases along the light path direction, and the cross-sectional area of the second light guide segment 200 remains constant, as long as the light exit surface area of the second light guide segment 200 is finally larger than that of the first light guide segment A light-incident surface area of 100 is sufficient.
  • the cross section of the first light guide section 100 and/or the cross section of the second light guide section 200 is a centrally symmetrical section. Since the shape of the light source is generally centrally symmetrical, the cross section of the first light guide section 100 and/or the cross section of the second light guide section 200 is set to be a centrally symmetrical section. Correspondingly, the light source can be The emitted light is better mixed to make the brightness and color of the projected spot more uniform.
  • the cross section of the first light guide section 100 and/or the cross section of the second light guide section 200 may be circular, regular polygonal, star-shaped or other centrally symmetrical shapes.
  • the shape of the light exit surface of the second light guide section 200 is more circular than the shape of the light entrance surface of the first light guide section 100. Therefore, the light spot projected through the segmented light guide tends to be more circular, so as to meet the general requirements for the shape of the projected light spot in the lighting field. It is possible that the light incident surface of the first light guide section 100 and the light exit surface of the second light guide section 200 are both regular polygons, and the number of sides of the light exit surface of the second light guide section 200 is more than that of the first light guide section 200.
  • the number of sides of the light-incident surface of the light guide section 100 can also be that the light-incident surface of the first light guide section 100 is a polygon, and the light-exit surface of the second light guide section 200 is a circle.
  • the light incident surface of the light section 100 is star-shaped, and the light exit surface of the second light guide section 200 is circular, as long as the light exit surface of the second light guide section 200 has a shape relative to that of the first light guide section 100.
  • the shape of the light incident surface tends to be more circular.
  • the side walls of the first light guide section 100 and the second light guide section 200 each have a plurality of edges 410, which is easy to process, and the second light guide section 200 has a
  • the number of edges 410 is greater than the number of edges 410 of the first light guide section 100, and tends to be more circular.
  • the first light guide section 100 and the second light guide section 200 are all or truncated cones.
  • the first light guide section 100 and the second light guide section 200 are The section 200 may also be a polygonal prism, or the first light guide section 100 and the second light guide section 200 may be other bodies with edges 410.
  • the light incident surface of the first light guide section 100 is a regular quadrilateral or a regular hexagon, which conforms to the shape of a general LED lamp bead, and/or the second light guide section
  • the light-emitting surface of 200 is regular hexagon, regular octagon or regular dodecagon, tending to be circular.
  • the light incident surface of the first light guide section 100 is a regular quadrilateral, and the light exit surface of the second light guide section 200 is a regular octagon; in the second embodiment of the present invention, the first light guide section The light incident surface of a light guide section 100 is a regular quadrilateral, and the light exit surface of the second light guide section 200 is a regular hexagon (as shown in FIG. 6); in the third embodiment of the present invention, the first light guide section The light incident surface of 100 is a regular quadrilateral, and the light exit surface of the second light guide section 200 is a regular dodecagon (as shown in FIG. 7).
  • the side wall of the first light guide section 100 has multiple edges 410, which can be polygonal prisms or truncated cones, which are easy to process.
  • the second light guide section 200 has a truncated cone shape. As a result, a circular light spot is projected through the segmented light guide, so as to meet the general requirements for the shape of the projected light spot in the lighting field.
  • the connecting surface 420 connecting two adjacent edges 410 protrudes outward to form an arc-shaped surface.
  • the arc-shaped surface is used to change the reflection direction of the light in the segmented light guide body, so that the subtle angle difference of the light can be enlarged, and the light diverges in different directions as much as possible, and the light mixing is more uniform.
  • the curvature of the connecting surface 420 of the first light guide section 100 and the curvature of the connecting surface 420 of the second light guide section 200 gradually increase toward each other until the The light exit surface of the first light guide section 100 and the light incident surface of the second light guide section 200 are circular.
  • the light exit surface of the first light guide section 100 is connected to the light entrance surface of the second light guide section 200.
  • the structure is simple, easy to process, and the simplest structure is used to achieve the purpose of light mixing and shaping.
  • the light exit surface of the first light guide section 100 and the light entrance surface of the second light guide section 200 may also be connected to each other by a cylinder with a constant radius.
  • the light exit surface of the first light guide section 100 and the light entrance surface of the second light guide section 200 are circular with the same radius.
  • the light beam enters the second light guide section 200 from the first light guide section 100 it is smooth and natural, and will not be very abrupt and cause light loss.
  • the cross section of the first light guide section 100 changes from a polygon to a circle
  • the cross section of the second light guide section 200 changes from a polygon to a circle.
  • the circular gradient becomes a polygon.
  • the cross section of the light guide section changes from a quadrilateral to a circle
  • the cross section of the second light guide section 200 changes from a circle to an octagon.
  • the length ratio of the first light guide section 100 to the second light guide section 200 is 2:1.
  • the ratio is optimal, and the light mixing effect and beam shaping effect are the most ideal.
  • the ratio of the overall length of the segmented light guide to the width of the light incident surface of the first light guide section 100 is 25:1 to 15:1. That is, as the width of the segmented light guide increases, the overall length of the segmented light guide is always maintained at 15 to 25 times the width of the light incident surface of the first light guide section 100. Within this ratio range, the overall length of the segmented light guide is sufficient to fully mix the light received from the light entrance surface of the first light guide section 100 to avoid uneven brightness and color of the emitted light spot .
  • the ratio of the overall length of the segmented light guide to the width of the light incident surface of the first light guide section 100 is 20:1, and the overall length of the segmented light guide is 3 cm To 8cm.
  • the present invention further includes a uniform light section 300 disposed on the light exit surface of the second light guide section 200, and the uniform light section 300 has a uniform light surface 310 for uniform light.
  • the homogenization section 300 further homogenizes the light beam emitted from the second light guide section 200 to avoid uneven brightness and color of the projected light spot.
  • the homogenizing surface 310 may be a frosted surface or a micro lens array.
  • the radius of the homogenizing section 300 is larger than the light exit surface of the second light guide section 200, which is beneficial to completely cover the light exit surface of the second light guide section 200, avoiding light leakage, and can be used for all outgoing light. Do homogenization.
  • the present invention also provides a stage light, which includes any of the aforementioned segmented light guides.

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Abstract

一种分段式导光体及具有其的舞台灯，分段式导光体包括第一导光段（100）与第二导光段（200），光线自第一导光段（100）传输向第二导光段（200），沿光路方向，第一导光段（100）与第二导光段（200）中至少一个的横截面面积沿光路方向逐渐增大，且第二导光段（200）的出光面面积大于第一导光段（100）的入光面面积，第一导光段（100）与第二导光段（200）的长度比为3∶1至1∶1。利用横截面较小的第一导光段（100）对收入的光进行多次反射以达到混光目的，并利用第二导光段（200）对光束进行塑形以达改变光斑的形状，由于第一导光段（100）与第二导光段（200）的长度比为3∶1至1∶1，在分段式导光体整体长度有限的情况下，第一导光段（100）与第二导光段（200）均不会过长或过短，从而保障投射光斑的形状和亮度、颜色的均匀性。

Description

一种分段式导光体及具有其的舞台灯 技术领域
本发明涉及灯光技术领域，更具体地，涉及一种分段式导光体及具有其的舞台灯。
 背景技术
在灯光技术领域中，为了将光源发出的光汇聚起来，一般会使用各种聚光元件，例如反光杯、导光体、聚光镜，其中反光杯主要是用于汇聚气泡灯发出的光线，导光体、聚光镜主要是用于汇聚LED灯珠发出的光线。由于LED灯珠大多呈方形，所以为了更好的对其进行收光，导光体的入光面也对应尽量趋向方形。传统的导光体，大多数入光面至出光面的横截面形状保持不变，比如入光面是正方形出光面也是正方形的导光体，或者入光面是正六边形出光面也是正六边形。这样会导致射出的光束在垂直于光路方向上的光斑为正方形或者正六边形，而在灯光领域，一般要求射出的光束在垂直于光路方向的光斑趋向于圆形，并且要求投射出的光斑亮度、颜色均匀，不能有明显的亮区或者暗区。所以有小部分导光体的出光面与入光面形状并不同，以保障收光效果和光斑形状，但是这些导光体对LED灯珠发出的光进行混光的效果却并不理想。
 技术问题
本发明为克服上述现有技术所述的至少一种缺陷，提供一种分段式导光体通过调整第一导光段与第二导光段的比例，可以使分段式导光体的既可以实现理想的光斑形状，也可以具有较好的混光效果。
 技术解决方案
为解决上述技术问题，本发明采用的技术方案是：一种分段式导光体，包括第一导光段与第二导光段，光线自所述第一导光段传输向所述第二导光段，沿光路方向，所述第一导光段与所述第二导光段中至少一个的横截面面积沿光路方向逐渐增大，且所述第二导光段的出光面面积大于所述第一导光段的入光面面积，所述第一导光段与所述第二导光段的长度比为3：1至1：1。
本发明所述分段式导光体，利用横截面面积较小的所述第一导光段对收入的光进行多次反射以达到混光的目的，并利用所述第二导光段对光束进行塑形以达改变光斑的形状，由于所述第一导光段与所述第二导光段的长度比为3：1至1：1，在所述分段式导光体整体长度有限的情况下，所述第一导光段与所述第二导光段均不会过长或者过短，从而可以实现既进行了充分的混光，也达到了理想的整形，保障投射光斑的整体形状和亮度、颜色的均匀性。
进一步地，所述第一导光段的横截面及/或所述第二导光段的横截面为中心对称截面。由于光源的形状一般是中心对称的，因此所述第一导光段的横截面及/或所述第二导光段的横截面设置为中心对称截面，与之相对应，可以对光源发出的光进行更好的混光，使投射出的光斑亮度、颜色更均匀。
进一步地，所述第二导光段的出光面形状相对于所述第一导光段的入光面形状更趋向于圆形。从而使经过所述分段式导光体投射出的光斑更加的趋向于圆形，以符合灯光领域一般对投射光斑形状的要求。
进一步地，所述第一导光段与所述第二导光段的侧壁均具有多条棱边，易于加工，且所述第二导光段的棱边数量大于所述第一导光段的棱边数量，更加趋向于圆形。
进一步地，所述第一导光段的入光面为正四边形或正六边形，符合一般LED灯珠的形状，及/或所述第二导光段的出光面为正六边形、正八边形或正十二边形，趋向于圆形。
进一步地，所述第一导光段的侧壁具有多条棱边，易于加工，所述第二导光段为圆台形，从而使经过所述分段式导光体投射出圆形光斑，以符合灯光领域一般对投射光斑形状的要求。
进一步地，连接相邻两条棱边的连接面向外凸出，形成弧形面。利用弧形面改变光线在所述分段式导光体内的反射方向，使光线的细微角度差得以放大，尽量朝不同的方向发散，混光更加均匀。
进一步地，所述第一导光段的出光面与所述第二导光段的入光面相连接。结构简单，易于加工，以最简单的结构实现混光、整形目的。
进一步地，所述第一导光段的出光面与所述第二导光段的入光面为半径相等的圆形。光束自所述第一导光段进入所述第二导光段时，流畅自然，不会十分突兀，造成光损。
进一步地，沿光路方向，所述第一导光段的横截面由多边形渐变为圆形，所述第二导光段的横截面由圆形渐变为多边形。使所述第一导光段、所述第二导光段的形状变化平滑，避免光线在所述第一导光段与所述第二导光段的传播过程中造成光损。
进一步地，所述第一导光段与所述第二导光段的长度比为2：1。比例最优，混光效果与光束整形效果最为理想。
进一步地，所述分段式导光体的整体长度与所述第一导光段入光面的宽度比为25：1至15：1。在这个比例范围内，所述分段式导光体的整体长度才足够将自所述第一导光段入光面收入的光线进行充分的混光，避免射出的光斑亮度、颜色不均匀。
进一步地还包括设置于所述第二导光段出光面的匀光段，所述匀光段具有用于匀光的匀光面。所述匀光段将自所述第二导光段射出的光束进一步匀光，避免投射出的光斑亮度、颜色不均匀。
本发发明还提供一种舞台灯，包括前述任一种分段式导光体。
 附图说明
图1是本发明分段式导光体第一实施例的结构示意图。
图2是本发明第一导光段的结构示意图。
图3是本发明第一导光段的横截面形状变化示意图。
图4是本发明第二导光段的结构示意图。
图5是本发明第二导光段的横截面形状变化示意图。
图6是本发明分段式导光体第二实施例的结构示意图。
图7是本发明分段式导光体第三实施例的结构示意图。
图中：
    100、第一导光段；200、第二导光段；300、匀光段；310、匀光面；410、棱边；420、连接面。
 本发明的最佳实施方式
附图仅用于示例性说明，不能理解为对本专利的限制；为了更好说明本实施例，附图某些部件会有省略、放大或缩小，并不代表实际产品的尺寸；对于本领域技术人员来说，附图中某些公知结构及其说明可能省略是可以理解的。附图中描述位置关系仅用于示例性说明，不能理解为对本专利的限制。
如图1，为本发明的实施例一，提供一种分段式导光体，包括第一导光段100与第二导光段200，光线自所述第一导光段100传输向所述第二导光段200，沿光路方向，即光束的射出方向，所述第一导光段100与所述第二导光段200中至少一个的横截面面积沿光路方向逐渐增大，且所述第二导光段200的出光面面积大于所述第一导光段100的入光面面积，所述第一导光段100与所述第二导光段200的长度比为3：1至1：1。
本发明所述分段式导光体，利用横截面面积较小的所述第一导光段100对收入的光进行多次反射以达到混光的目的，并利用所述第二导光段200对光束进行塑形以达改变光斑的形状，由于所述第一导光段100与所述第二导光段200的长度比为3：1至1：1，在所述分段式导光体整体长度有限的情况下，所述第一导光段100与所述第二导光段200均不会过长或者过短，从而可以实现既进行了充分的混光，也达到了理想的整形，保障投射光斑的整体形状和亮度、颜色的均匀性。
在本实施例中，所述第一导光段100的横截面面积、所述第二导光段200的横截面面积均沿光路方向逐渐增大。在其它实施例中，也可以是所述第一导光段100的横截面面积保持恒定，所述第二导光段200的横截面面积沿光路方向逐渐增大；或所述第一导光段100的横截面面积沿光路方向逐渐增大，所述第二导光段200的横截面面积保持恒定，只要最终所述第二导光段200的出光面面积大于所述第一导光段100的入光面面积即可。
如图2至图4，在本发明优选地实施例中，所述第一导光段100的横截面及/或所述第二导光段200的横截面为中心对称截面。由于光源的形状一般是中心对称的，因此所述第一导光段100的横截面及/或所述第二导光段200的横截面设置为中心对称截面，与之相对应，可以对光源发出的光进行更好的混光，使投射出的光斑亮度、颜色更均匀。可选地，所述第一导光段100的横截面及/或所述第二导光段200的横截面可以为圆形、正多边形、星形或其它中心对称形状。
在本发明优选地实施例中，所述第二导光段200的出光面形状相对于所述第一导光段100的入光面形状更趋向于圆形。从而使经过所述分段式导光体投射出的光斑更加的趋向于圆形，以符合灯光领域一般对投射光斑形状的要求。可以所述第一导光段100的入光面与所述第二导光段200的出光面均为正多边形，且所述第二导光段200的出光面边数多于所述第一导光段100的入光面边数，也可以所述第一导光段100的入光面为多边形，所述第二导光段200的出光面为圆形，还可以所述第一导光段100的入光面为星形，所述第二导光段200的出光面为圆形，只要所述第二导光段200的出光面形状相对于所述第一导光段100的入光面形状更趋向于圆形即可。
在本发明优选地实施例中，所述第一导光段100与所述第二导光段200的侧壁均具有多条棱边410，易于加工，且所述第二导光段200的棱边410数量大于所述第一导光段100的棱边410数量，更加趋向于圆形。在本实施例中，所述第一导光段100、所述第二导光段200均为或锥台，在其它实施例中，所述第一导光段100、所述第二导光段200也可以为均多棱柱，或者所述第一导光段100、所述第二导光段200为其它具有棱边410的主体。
如图，在本发明优选地实施例中，所述第一导光段100的入光面为正四边形或正六边形，符合一般LED灯珠的形状，及/或所述第二导光段200的出光面为正六边形、正八边形或正十二边形，趋向于圆形。在本实施例中，所述第一导光段100的入光面为正四边形，所述第二导光段200的出光面为正八边形；在本发明的实施例二中，所述第一导光段100的入光面为正四边形，所述第二导光段200的出光面为正六边形（如图6）；在本发明的实施例三中，所述第一导光段100的入光面为正四边形，所述第二导光段200的出光面为正十二边形（如图7）。
在本发明优选地实施例中，所述第一导光段100的侧壁具有多条棱边410，可以为多棱柱或者锥台，易于加工，所述第二导光段200为圆台形，从而使经过所述分段式导光体投射出圆形光斑，以符合灯光领域一般对投射光斑形状的要求。
在本发明优选地实施例中，连接相邻两条棱边410的连接面420向外凸出，形成弧形面。利用弧形面改变光线在所述分段式导光体内的反射方向，使光线的细微角度差得以放大，尽量朝不同的方向发散，混光更加均匀。
在本实施例中，所述第一导光段100的所述连接面420的曲率以及所述第二导光段200的所述连接面420的曲率均向相互靠近方向逐渐增大，直至使所述第一导光段100的出光面、所述第二导光段200的入光面成为圆形。
如图1，在本发明优选地实施例中，所述第一导光段100的出光面与所述第二导光段200的入光面相连接。结构简单，易于加工，以最简单的结构实现混光、整形目的。在其它实施例中，所述第一导光段100的出光面与所述第二导光段200的入光面也可以通过半径恒定的柱体相互连接。
在本发明优选地实施例中，所述第一导光段100的出光面与所述第二导光段200的入光面为半径相等的圆形。光束自所述第一导光段100进入所述第二导光段200时，流畅自然，不会十分突兀，造成光损。
如图2至图4，在本发明优选地实施例中，沿光路方向，所述第一导光段100的横截面由多边形渐变为圆形，所述第二导光段200的横截面由圆形渐变为多边形。使所述第一导光段100、所述第二导光段200的形状变化平滑，避免光线在所述第一导光段100与所述第二导光段200的传播过程中造成光损。在本实施例中，所述导光段的横截面由四边形渐变为圆形，所述第二导光段200的横截面由圆形渐变为八边形。
如图1，在本发明优选地实施例中，所述第一导光段100与所述第二导光段200的长度比为2：1。比例最优，混光效果与光束整形效果最为理想。
在本发明优选地实施例中，所述分段式导光体的整体长度与所述第一导光段100入光面的宽度比为25：1至15：1。即随着所述分段式导光体宽度的增加，所述分段式导光体的整体长度始终保持在所述第一导光段100入光面宽度的15至25倍。在这个比例范围内，所述分段式导光体的整体长度才足够将自所述第一导光段100入光面收入的光线进行充分的混光，避免射出的光斑亮度、颜色不均匀。
在本实施例中，所述分段式导光体的整体长度与所述第一导光段100入光面的宽度比为20：1，所述分段式导光体的整体长度为3cm至8cm。
在本发明优选地实施例中，还包括设置于所述第二导光段200出光面的匀光段300，所述匀光段300具有用于匀光的匀光面310。所述匀光段300将自所述第二导光段200射出的光束进一步匀光，避免投射出的光斑亮度、颜色不均匀。所述匀光面310可以为磨砂面，也可以为微透镜阵列。
可选地，所述匀光段300的半径大于第二导光段200的出光面，有利于将所述第二导光段200的出光面完全覆盖，避免光线泄露，可以对所有的出射光进行匀光。
本发发明还提供一种舞台灯，包括前述任一种分段式导光体。
    显然，本发明的上述实施例仅仅是为了清楚地说明本发明所作的举例，而并非是对本发明的实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明权利要求的保护范围之内。

Claims (14)

  1. 一种分段式导光体，其特征在于，包括第一导光段（100）与第二导光段（200），光线自所述第一导光段（100）传输向所述第二导光段（200），沿光路方向，所述第一导光段（100）与所述第二导光段（200）中至少一个的横截面面积沿光路方向逐渐增大，且所述第二导光段（200）的出光面面积大于所述第一导光段（100）的入光面面积，所述第一导光段（100）与所述第二导光段（200）的长度比为3：1至1：1。
  2. 根据权利要求1所述的分段式导光体，其特征在于，所述第一导光段（100）的横截面及/或所述第二导光段（200）的横截面为中心对称截面。
  3. 根据权利要求1所述的分段式导光体，其特征在于，所述第二导光段（200）的出光面形状相对于所述第一导光段（100）的入光面形状更趋向于圆形。
  4. 根据权利要求1所述的分段式导光体，其特征在于，所述第一导光段（100）与所述第二导光段（200）的侧壁均具有多条棱边（410），且所述第二导光段（200）的棱边（410）数量大于所述第一导光段（100）的棱边（410）数量。
  5. 根据权利要求4所述的分段式导光体，其特征在于，所述第一导光段（100）的入光面为正四边形或正六边形，及/或所述第二导光段（200）的出光面为正六边形、正八边形或正十二边形。
  6. 根据权利要求1所述的分段式导光体，其特征在于，所述第一导光段（100）的侧壁具有多条棱边（410），所述第二导光段（200）为圆台形。
  7. 根据权利要求4或6所述的分段式导光体，其特征在于，连接相邻两条棱边（410）的连接面（420）向外凸出，形成弧形面。
  8. 根据权利要求1所述的分段式导光体，其特征在于，所述第一导光段（100）的出光面与所述第二导光段（200）的入光面相连接。
  9. 根据权利要求1所述的分段式导光体，其特征在于，所述第一导光段（100）的出光面与所述第二导光段（200）的入光面为半径相等的圆形。
  10. 根据权利要求9所述的分段式导光体，其特征在于，沿光路方向，所述第一导光段（100）的横截面由多边形渐变为圆形，所述第二导光段（200）的横截面由圆形渐变为多边形。
  11. 根据权利要求1所述的分段式导光体，其特征在于，所述第一导光段（100）与所述第二导光段（200）的长度比为2：1。
  12. 根据权利要求1所述的分段式导光体，其特征在于，所述分段式导光体的整体长度与所述第一导光段（100）入光面的宽度比为25：1至15：1。
  13. 根据权利要求1所述的分段式导光体，其特征在于，还包括设置于所述第二导光段（200）出光面的匀光段（300），所述匀光段（300）具有用于匀光的匀光面（310）。
  14. 一种舞台灯，其特征在于，包括权利要求1至11任一项所述的分段式导光体。
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