Lamp strip

Abstract

The utility model provides a lamp strip which comprises a strip body and a light-emitting element, the strip body is provided with a cavity with an opening in the length direction of the strip body, a diffusion piece is arranged at the opening, and the inner surface of the side wall, in the length direction, of the strip body is provided with a reflecting surface; the light-emitting element is arranged in the cavity, and first light rays emitted by the light-emitting element are reflected by the reflecting surface and then are emitted out of the belt body from the diffusion piece; wherein the outline of the reflecting surface on a first cross section conforms to a first curve, and the first cross section is perpendicular to the length direction of the belt body. The lamp strip can achieve the purposes of giving consideration to the light emitting uniformity, improving the optical efficiency and reducing the width of the lamp strip.

Description

Technical Field

[0001] The present application relates to the field of light strips, and in particular to a light strip. Background Art

[0002] LED light strips are usually used as the light source of light strips. For the light strip products currently sold in the market, side-emitting light strips are the most common and versatile type. Its main advantage is that on the one hand, it can ensure the uniformity of the light emitted by the light strip, and on the other hand, it can ensure that customers will not look directly at the glowing LED light strip, avoiding uncomfortable glare.

[0003] The light strips in the related art are usually side-emitting, by placing the LED light strip on the inner side wall of the light strip, so that the light emitted by the LED strip is reflected by the reflective component inside the light strip and then emitted outside the light strip, or by placing optical elements such as diffusion elements or light guide elements at the light outlet of the light strip, so that the light emitted by the LED light strip is emitted outside the light strip after passing through the optical elements. In this way, the light strip is wider in the width direction, and the optical efficiency of the light emitted by the LED light strip is only about 30%. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a light strip, which is used to enable the light strip in the related art to achieve the goals of taking into account the uniformity of light emission, improving optical efficiency and reducing the width of the light strip.

[0005] The basic concept proposed by the applicant is: by arranging a reflective surface on the inner surface of the cavity of the belt body and arranging a diffuser at the opening of the cavity, the first light emitted by the light-emitting element in the cavity is reflected by the reflective surface and then emitted from the diffuser outside the belt body, and the reflective surface is designed in a first cross-section perpendicular to the length direction of the belt body to conform to a first curve, so that the first light is more evenly irradiated on the diffuser after being reflected by the reflective surface, thereby improving the uniformity and optical efficiency of the first light emitted from the diffuser; at the same time, compared with arranging the light-emitting element in the cavity through a circuit board, the light-emitting element is directly arranged in the cavity of the belt body. On the basis of the same light-emitting element, the thickness of the circuit board in the width direction of the belt body is reduced, and the size of the belt body in the width direction is indirectly reduced, so that the light strip can achieve the purpose of taking into account the uniformity of light emission, improving the optical efficiency and reducing the width of the light strip.

[0006] Based on the above basic concept, an embodiment of the present application provides a light strip, comprising a strip body and a light-emitting element, wherein the strip body has a cavity with an opening along the length direction of the strip body, a diffuser is provided at the opening, and the inner surface of the side wall of the strip body along the length direction has a reflective surface; the light-emitting element is arranged in the cavity, and a first light emitted by the light-emitting element is reflected by the reflective surface and then emitted from the diffuser to the outside of the strip body; wherein a two-dimensional coordinate system is established with the center point of the light-emitting element in the first cross section as the origin O1, the optical axis of the light-emitting element as the X1 axis, and the direction passing through the origin and perpendicular to the X1 axis as the Y1 axis, then the contour of the reflective surface in the first cross section (100) conforms to the first curve, and the first curve expression is: y 1 =A 1 x 1 3 +B 1 x 1 2 +C 1 x 1 +D 1 , and x 1 ∈(0,2.8),A 1 ∈(-0.0406,-0.0402), B 1 ∈(0.8273,0.8277), C 1 ∈(-0.6789,-0.6785), D 1 is a constant, and the first cross section is perpendicular to the length direction of the strip body.

[0007] The light strip provided in the embodiment of the present application is provided with a reflective surface on the inner surface of the cavity of the strip body, and a diffuser is provided at the opening of the cavity, so that the first light emitted by the light-emitting element in the cavity is reflected by the reflective surface and then emitted from the outside of the strip body from the diffuser, and the reflective surface is designed in a first cross-section perpendicular to the length direction of the strip body to conform to a first curve, so that the first light is more evenly irradiated on the diffuser after being reflected by the reflective surface, thereby improving the uniformity and optical efficiency of the first light emitted from the diffuser; at the same time, compared with setting the light-emitting element in the cavity through a circuit board, the light-emitting element is directly set in the cavity of the strip body. On the basis of the same light-emitting element, the thickness of the circuit board in the width direction of the strip body is reduced, and the size of the strip body in the width direction is indirectly reduced, so that the light strip can achieve the purpose of taking into account the uniformity of light emission, improving the optical efficiency and reducing the width of the light strip.

[0008] In some embodiments, the strip body includes a bearing wall and a reflecting wall, and the bearing wall, the reflecting wall and the diffuser are arranged to form the cavity; the inner surface of the reflecting wall has the reflecting surface; the light-emitting element is an LED chip, and in the width direction of the strip body, the light-emitting element is arranged on the bearing wall, and the thickness direction of the light-emitting element is parallel to the width direction of the strip body.

[0009] In some embodiments, the bearing wall includes a first wall and a second wall, the first wall is connected between the second wall and the reflective wall, and the second wall is opposite to the reflective wall in the width direction of the belt body.

[0010] In some embodiments, the inner surface of the first wall is a plane, the inner surface of the first wall is parallel to the width direction of the belt body, and the light emitting element is disposed on the inner surface of the first wall.

[0011] Compared with the second wall of the light-emitting element or the connection between the first wall and the second wall, the above technical solution reduces the distance between the first light emitted by the light-emitting element and the reflective surface, so that more first light can be irradiated onto the reflective surface, which is beneficial to improve the light extraction efficiency.

[0012] In some embodiments, in the width direction of the belt body, the light emitting element is disposed in the middle of the first wall.

[0013] Compared with the end of the first wall of the light emitting element close to the second wall, by adopting the above technical solution, the distance between the first light emitted by the light emitting element and the reflecting surface is further reduced, which is beneficial to improve the light extraction efficiency.

[0014] In some embodiments, the first wall and the second wall are an integral structure; and / or the bearing wall and the reflecting wall are an integral structure.

[0015] By adopting the above technical solution, the strength of the strip body is improved, which is beneficial to improving the reliability of the light strip.

[0016] In some embodiments, the diffuser is a strip-shaped diffuser plate, comprising a first surface and a second surface opposite to each other in the thickness direction of the diffuser plate, wherein the first surface has a protrusion protruding in a direction away from the second surface; when the diffuser is disposed at the opening, the first surface is located in the cavity.

[0017] By adopting the above technical solution, the distance between the reflective surface and the light-incoming surface of the diffuser is reduced, which not only improves the light extraction efficiency but also helps to improve the light uniformity.

[0018] In some embodiments, the raised portion is in the shape of an elongated strip, the raised portion extends along the length direction of the belt body, and a contour of a raised side of the raised portion in a second cross section perpendicular to the length direction of the diffuser conforms to a second curve.

[0019] By adopting the above technical solution, the light emitted from the belt body through the diffuser is made more uniform.

[0020] In some embodiments, the diffuser further includes a third surface and a fourth surface connected between the first surface and the second surface. In the second cross section, a two-dimensional coordinate system is established with the intersection of the second surface and the third surface as the origin O2, the direction of the second surface as the X2 axis, and the direction of the third surface as the Y2 axis. Then, the surface of the protrusion conforms to the second curve in the second cross section. The expression of the second curve is: y 2 =A 2 x 2 3 +B 2 x 2 2 +C 2 x 2 +D 2 , and x 2 ∈(0,2.8),A 2 ∈(0.1222,0.1226), B 2 ∈(-1.086,-1.084), C 2 ∈(2.153,2.155),D 2 is a constant; when the diffuser is disposed at the opening, the second cross section is parallel to the first cross section, the first surface is located in the cavity, the X2 axis is parallel to the X1 axis, and the Y2 axis is parallel to the Y1 axis.

[0021] By adopting the above technical solution, the light emitted from the belt body through the diffuser is further made more uniform.

[0022] In some embodiments, when the diffuser is disposed at the opening, the raised portion is located between the reflective surface and the light-emitting element in the width direction of the strip; and / or there is a gap between the raised portion and the light-emitting element in the height direction of the strip.

[0023] By adopting the above technical solution, the first light reflected by the reflective surface can be irradiated more and more evenly on the light-incoming surface of the diffuser, that is, the surface of the raised portion, thereby facilitating improving the light efficiency of the light strip.

[0024] In some embodiments, there are multiple light-emitting elements, and the multiple light-emitting elements are arranged at intervals along the length direction of the belt body.

[0025] By adopting the above technical solution, the light output of the light strip is increased, thereby further improving the light effect of the light strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 This is a schematic diagram of the structure of the light strip in some embodiments of the present application at a viewing angle;

[0028] Figure 2 for Figure 1 Exploded diagram of

[0029] Figure 3 for Figure 1 A cross-sectional stereoscopic view of the light strip at a first cross section;

[0030] Figure 4 for Figure 1 A cross-sectional view of the light strip at a first cross section;

[0031] Figure 5 for Figure 1 The schematic diagram of the structure of the light strip in another perspective;

[0032] Figure 6 A first curve diagram of a reflective surface in a first cross section in some embodiments of the present application;

[0033] Figure 7 This is a second curve graph of the surface of the protrusion in the second cross section in some embodiments of the present application.

[0034] Reference numerals:

[0035] 100, first section;

[0036] 10. belt body; 101. cavity; 102. opening; 103. reflecting surface; 11. bearing wall; 111. first wall; 112. second wall; 12. reflecting wall;

[0037] 20. diffuser; 201. raised portion; 21. first surface; 22. second surface; 23. third surface; 24. fourth surface;

[0038] 30. Light-emitting element;

[0039] 40. Gap. DETAILED DESCRIPTION

[0040] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0041] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] In the description of the present application, it should be understood that the terms "upper", "lower", "side", "front", "rear", etc. indicate orientations or positional relationships based on the installation, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] In the description of this application, it should be noted that the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0045] It should also be noted that, in the embodiments of the present application, the same figure mark is used to represent the same component or the same part. For the same parts in the embodiments of the present application, the figure may only mark one of the parts or components as an example. It should be understood that the figure mark also applies to other identical parts or components.

[0046] like Figure 1 to Figure 3 and Figure 6 As shown, the embodiment of the present application provides a light strip, including a strip body 10 and a light-emitting element 30, wherein the strip body 10 has a cavity 101 with an opening 102 along the length direction of the strip body 10, a diffuser 20 is provided at the opening 102, and the inner surface of the side wall of the strip body 10 along the length direction has a reflective surface 103; the light-emitting element 30 is arranged in the cavity 101, and the first light emitted by the light-emitting element 30 is reflected by the reflective surface 103 and then emitted from the diffuser 20 to the outside of the strip body 10; wherein, a two-dimensional coordinate system is established with the center point of the light-emitting element 30 in the first section 100 as the origin O1, the optical axis of the light-emitting element 30 as the X1 axis, and the direction perpendicular to the X1 axis through the origin as the Y1 axis, then the contour of the reflective surface 103 in the first section 100 (100) conforms to the first curve, and the first curve expression is: y 1 =A 1 x 1 3 +B 1 x 1 2 +C 1 x 1 +D 1 , and x 1 ∈(0,2.8),A 1 ∈(-0.0406,-0.0402), B 1 ∈(0.8273,0.8277), C 1 ∈(-0.6789,-0.6785), D 1 is a constant, and the first section 100 is perpendicular to the length direction of the belt body 10 ( Figure 1 The direction indicated by the arrow L shown in the figure).

[0047] The light strip is a side-emitting light strip. The strip body 10 of the light strip can be flexible or rigid. The outer contour of the light strip is a cube. Figure 1 The direction indicated by the arrow L in the middle is the width direction of the light strip. Figure 1 The direction indicated by the arrow W in the middle is the height direction of the light strip. Figure 1 The direction indicated by the arrow H.

[0048] The design of the first curve is to uniformly emit the energy of the first light beam emitted by the light emitting element 30 according to the angle, and calculate the curvature of the curve corresponding to each portion of energy by using the vector algorithm of the relationship between the incident light beam, the outgoing light beam and the normal line satisfied by the first light beam passing through the reflecting surface 103, so as to control the propagation direction of each portion of energy, so that the first light beam reflected by the reflecting surface 103 can be uniformly irradiated on the diffuser 20, and the final outgoing light beam can present a visually uniform distribution effect on the light-emitting surface of the flexible light strip behind the diffuser 20, that is, on the diffuser 20. In this way, the outgoing light beam emitted from the belt body 10 through the diffuser 20 will be more uniform accordingly.

[0049] The above-mentioned reflecting surface 103 conforms to the first curve in the first section 100. In fact, the outline of the reflecting surface 103 in the first section 100 is not a curve in the full sense. The first curve is obtained by curve fitting based on multiple points on the outline of the reflecting surface 103 in the first section 100, so the first curve is a fitting curve.

[0050] By setting a reflective surface 103 on the inner surface of the cavity 101 of the belt body 10, and setting a diffuser 20 at the opening 102 of the cavity 101, the first light emitted by the light-emitting element 30 located in the cavity 101 is reflected by the reflective surface 103 and then emitted from the diffuser 20 to the outside of the belt body 10, and the reflective surface 103 is designed in a first section 100 perpendicular to the length direction of the belt body 10 to conform to the first curve, so that the first light is more evenly irradiated on the diffuser 20 after being reflected by the reflective surface 103, thereby improving the uniformity and optical efficiency of the first light emitted from the diffuser 20; at the same time, compared with setting the light-emitting element 30 in the cavity 101 through the circuit board, the light-emitting element 30 is directly set in the cavity 101 of the belt body 10. On the basis of the same light-emitting element 30, the thickness of the circuit board of the belt body 10 in the width direction is reduced, and the size of the belt body 10 in the width direction is indirectly reduced, so that the light strip can achieve the purpose of taking into account the uniformity of light emission, improving the optical efficiency and reducing the width of the light strip.

[0051] Figure 2 The structure of the light emitting element 30 and the arrangement of the plurality of light emitting elements 30 are exemplarily shown. The light emitting element 30 is schematically shown as a cubic block.

[0052] like Figure 2 As shown, three light emitting elements 30 are arranged in the strip body 10. Compared with the arrangement of one light emitting element 30, the arrangement of multiple light emitting elements 30 increases the light output of the light strip.

[0053] Of course, other numbers of light-emitting elements 30 may be arranged in the strip body 10 to meet different lighting requirements of different light strips.

[0054] The light emitting element 30 in the embodiment of the present application can be selected from any one of the models 5050, 3030, and 3838. The 5050 model is commonly used, which has a lower cost, better light efficiency, and a higher cost performance overall.

[0055] like Figure 3 As shown, the outer contour of the light strip in the first cross section 100 is generally rectangular, and the outer contour is a rectangle as an example for description. For the purpose of description, the light emitting element 30 is an LED chip.

[0056] In order to clearly show the specific expression of the first curve, the geometric center point of the light emitting element 30 in the cross section perpendicular to the length direction L of the belt body 10 is used as the origin O1 of the first curve. For example, in one embodiment, the first curve can be as follows: Figure 6 The curve shown.

[0057] It should be noted that, in the design process of the reflective surface 103 of the light strip, the origin O1 may be in the central area of ​​the light emitting element 30 in the first section 100 , that is, near the geometric center of the light emitting element 30 , which is not specifically limited here.

[0058] During the design of the light strip, the number of light-emitting elements 30 in the strip body 10 is determined based on the length of the strip body 10 and the properties and optical parameters of the light-emitting elements 30 themselves, as well as the final optical parameters of the light strip. The specific number of light-emitting elements 30 in the strip body 10 is not specifically limited here.

[0059] like Figure 3 As shown, the belt body 10 includes a bearing wall 11 and a reflecting wall 12. The bearing wall 11, the reflecting wall 12 and the diffuser 20 are arranged to form a cavity 101. The inner surface of the reflecting wall 12 has a reflecting surface 103. The light-emitting element 30 is an LED chip. In the width direction of the belt body 10, the light-emitting element 30 is arranged on the bearing wall 11. The thickness direction of the light-emitting element 30 is the same as the width direction of the belt body 10 ( Figure 3 Parallel to the direction indicated by the arrow W shown in the figure).

[0060] like Figure 3 and Figure 4 As shown, the bearing wall 11 includes a first wall 111 and a second wall 112, the first wall 111 is connected between the second wall 112 and the reflective wall 12, and the second wall 112 is opposite to the reflective wall 12 in the width direction of the belt body 10. In this way, the belt body 10 is similar to a "U" shape in the first section 100.

[0061] like Figure 3 As shown, in some embodiments, the inner surface of the first wall 111 is a plane, the inner surface of the first wall 111 is parallel to the width direction of the belt body 10 , and the light emitting element 30 is disposed on the inner surface of the first wall 111 .

[0062] Compared with the second wall 112 of the light-emitting element 30 or the connection between the first wall 111 and the second wall 112, by arranging the light-emitting element 30 on the inner surface of the first wall 111, not only the distance between the first light emitted by the light-emitting element 30 and the reflecting surface 103 is reduced, so that more first light can be irradiated onto the reflecting surface 103, which is beneficial to improve the light extraction efficiency, but also the inner surface of the first wall 111 is a plane, which is beneficial to improve the installation accuracy of the light-emitting element 30.

[0063] like Figure 3 As shown, in some embodiments, the light emitting element 30 is disposed in the middle of the first wall 111 in the width direction of the belt body 10 .

[0064] Compared with the end of the first wall 111 of the light emitting element 30 close to the second wall 112, by arranging the light emitting element 30 in the middle of the first wall 111, the distance between the first light emitted by the light emitting element 30 and the reflecting surface 103 is further reduced, which is beneficial to improve the light extraction efficiency.

[0065] Of course, if necessary, the position of the light emitting element 30 on the first wall 111 can be adjusted to make the light emission effect more uniform.

[0066] The first wall 111 and the second wall 112 may be an integral structure, and the bearing wall 11 and the reflecting wall 12 may be an integral structure. In this way, the strip body 10 is an integral structure, which not only reduces the number of parts and simplifies the assembly process of the light strip, but also improves the strength of the strip body 10, thereby improving the reliability of the light strip.

[0067] Of course, the bearing wall 11 and the reflecting wall 12 may also be separate structures, connected together by gluing, clamping, etc., which is not specifically limited here.

[0068] like Figure 4 As shown, in some embodiments, the diffuser 20 is a strip-shaped diffuser plate, and the diffuser 20 includes a first surface 21 ( Figure 4 The first surface 21 and the second surface 22 are connected with a third surface 23 and a fourth surface 24. In a second cross section perpendicular to the length direction of the diffuser 20, the first surface 21, the second surface 22, the third surface 23 and the fourth surface 24 are arranged in a square shape. The first surface 21 has a protrusion 201, and the protrusion 201 protrudes in a direction away from the second surface 22. When the diffuser 20 is arranged at the opening 102, the first surface 21 is located in the cavity 101. That is, when the diffuser 20 is arranged at the opening 102, the protrusion 201 protrudes toward the side close to the light emitting element 30.

[0069] When the diffuser 20 is disposed at the opening 102 , the second cross section is parallel to the first cross section 100 .

[0070] By adopting the above technical solution, compared with making the first surface 21 into a plane, not only the distance between the reflecting surface 103 and the light-entering surface of the diffuser 20 is reduced, but also the area of ​​the light-entering surface of the diffuser 20 is increased. In this way, not only the first light reflected by the reflecting surface 103 can be more likely to find the first surface 21 of the diffuser 20, thereby improving the light extraction efficiency, but also it is beneficial to improve the uniformity of the light.

[0071] The protrusion 201 is in the shape of an elongated strip and extends along the length direction of the belt body 10 . The contour of the protrusion side of the protrusion 201 in the second cross section perpendicular to the length direction of the diffuser 20 conforms to a second curve.

[0072] During the design process, the second curve mainly plays a role in uniform light, so that the light emitted from the belt body 10 through the diffuser 20 is more uniform.

[0073] like Figure 4 and Figure 7 As shown, when the diffuser 20 is disposed at the opening 102, the second section is parallel to the first section 100, and the first surface 21 is located in the cavity 101. In the second section, a two-dimensional coordinate system is established with the intersection of the second surface 22 and the third surface 23 as the origin O2, the direction of the second surface 22 as the X2 axis, and the direction of the third surface 23 as the Y2 axis. Then, the surface of the protrusion 201 in the second section conforms to the second curve, and the expression of the second curve is: y 2 =A 2 x 2 3 +B 2 x 2 2 +C 2 x 2 +D 2 , and x 2 ∈(0,2.8),A 2 ∈(0.1222,0.1226), B 2 ∈(-1.086,-1.084), C 2 ∈(2.153,2.155),D 2 is a constant, wherein the X2 axis is parallel to the X1 axis, and the Y2 axis is parallel to the Y1 axis.

[0074] For example, the second curve may be as follows in one embodiment: Figure 7 The curve shown.

[0075] Of course, the user can adjust various parameters of the second curve according to the position of the light emitting element 30 and the structure of the strip body 10 to optimize the light effect of the light strip.

[0076] Of course, in addition to conforming to the second curve expression in the second cross section, the protrusion 201 may also be other microstructures that can make the light passing through the diffuser 20 and emitted outside the belt body 10 more uniform, which is not specifically limited here.

[0077] like Figure 4 As shown, in some embodiments, the protrusion 201 is located between the reflective surface 103 and the light emitting element 30. Figure 4 In the figure, the protrusion 201 is located at the upper left corner of the light emitting element 30 .

[0078] By adopting the above technical solution, the optical path is reduced, thereby achieving the purpose of improving both the light output and uniformity.

[0079] like Figure 4 As shown, in some embodiments, in the height direction of the belt body 10 , there is a gap 40 between the protrusion 201 and the light emitting element 30 .

[0080] By adopting the above technical solution, the first light reflected by the reflective surface 103 can be irradiated more and more evenly on the light-incoming surface of the diffuser 20, that is, the surface of the raised portion 201, that is, the first surface 21, through the gap 40, thereby helping to improve the lighting effect of the light strip.

[0081] The gap 40 needs to be appropriately adjusted according to the dimensions of the strip 10 , the light emitting element 30 , the reflective surface 103 , the diffuser 20 , and the optical parameter requirements of the light strip, which are not specifically limited here.

[0082] In summary, the width of the light strip of the present application can be less than 10 mm.

[0083] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A light strip, characterized in that: include: A belt body (10), having a cavity (101) with an opening (102) along the length direction of the belt body (10), a diffuser (20) being provided at the opening (102), and an inner surface of a side wall of the belt body (10) along the length direction having a reflective surface (103); A light emitting element (30) is disposed in the cavity (101), wherein a first light beam emitted by the light emitting element (30) is reflected by the reflection surface (103) and then emitted from the diffusion element (20) to the outside of the belt body (10); A two-dimensional coordinate system is established with the center point of the light emitting element (30) in the first section (100) as the origin O1, the optical axis of the light emitting element (30) as the X1 axis, and the direction passing through the origin and perpendicular to the X1 axis as the Y1 axis. The contour of the reflecting surface (103) in the first section (100) conforms to a first curve, and the first curve expression is: y1=A1x1 3 +B1x1 2 +C1x1+D1, and x1∈(0, 2.8), A1∈(-0.0406, -0.0402), B1∈(0.8273, 0.8277), C1∈(-0.6789, -0.6785), D1 is a constant; The first cross section (100) is perpendicular to the length direction of the belt body (10).

2. The light strip according to claim 1, characterized in that: The belt body (10) comprises a bearing wall (11) and a reflecting wall (12); the bearing wall (11), the reflecting wall (12) and the diffuser (20) are arranged to form the cavity (101); the inner surface of the reflecting wall (12) has the reflecting surface (103); The light emitting element (30) is an LED chip. In the width direction of the belt (10), the light emitting element (30) is arranged on the bearing wall (11), and the thickness direction of the light emitting element (30) is parallel to the width direction of the belt (10).

3. The light strip according to claim 2, characterized in that: The bearing wall (11) comprises a first wall (111) and a second wall (112); the first wall (111) is connected between the second wall (112) and the reflecting wall (12); in the width direction of the belt body (10), the second wall (112) is opposite to the reflecting wall (12).

4. The light strip according to claim 3, characterized in that: The inner surface of the first wall (111) is a plane, the inner surface of the first wall (111) is parallel to the width direction of the belt body (10), and the light emitting element (30) is arranged on the inner surface of the first wall (111); And / or, in the width direction of the belt body (10), the light emitting element (30) is arranged in the middle of the first wall (111).

5. The light strip according to claim 3 or 4, characterized in that: The first wall (111) and the second wall (112) are an integral structure; And / or, the bearing wall (11) and the reflecting wall (12) are an integral structure.

6. The light strip according to any one of claims 1 to 4, characterized in that: The diffuser (20) is a strip-shaped diffuser plate, comprising a first surface (21) and a second surface (22) which are opposite to each other in the thickness direction of the diffuser plate, the first surface (21) having a protrusion (201), and the protrusion (201) protrudes in a direction away from the second surface (22); When the diffuser (20) is disposed at the opening (102), the first surface (21) is located in the cavity (101).

7. The light strip according to claim 6, characterized in that: The raised portion (201) is in the shape of an elongated strip and extends along the length direction of the belt body (10). The contour of the raised side of the raised portion (201) in a second cross section perpendicular to the length direction of the diffuser (20) conforms to a second curve.

8. The light strip according to claim 7, characterized in that: The diffuser (20) further comprises a third surface (23) and a fourth surface (24) connected between the first surface (21) and the second surface (22); in the second cross section, a two-dimensional coordinate system is established with the intersection of the second surface (22) and the third surface (23) as the origin O2, the direction of the second surface (22) as the X2 axis, and the direction of the third surface (23) as the Y2 axis. Then, the surface of the protruding portion (201) conforms to a second curve in the second cross section. The expression of the second curve is: y2=A2x2 3 +B2X2 2 +C2x2+D2, and x2∈(0, 2.8), A2∈(0.1222, 0.1226), B2∈(-1.086, -1.084), C2∈(2.153, 2.155), D2 is a constant; When the diffuser (20) is disposed at the opening (102), the second cross section is parallel to the first cross section (100), the first surface (21) is located in the cavity (101), the X2 axis is parallel to the X1 axis, and the Y2 axis is parallel to the Y1 axis.

9. The light strip according to claim 7 or 8, characterized in that: When the diffuser (20) is disposed at the opening (102); In the width direction of the belt body (10), the raised portion (201) is located between the reflective surface (103) and the light-emitting element (30); And / or, in the height direction of the belt body (10), there is a gap (40) between the protruding portion (201) and the light emitting element (30).

10. The light strip according to any one of claims 1 to 4, characterized in that: The number of the light emitting elements (30) is plural, and the plural light emitting elements (30) are arranged at intervals along the length direction of the belt body (10).

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