LED lamp bead and linear light projector

Abstract

The utility model discloses a LED lamp pearl, linear light projector, columnar lens and light projecting assembly relates to lighting technical field, wherein, LED lamp pearl includes support, light emitting chip and lens. The support forms the light cup. Light emitting chip sets up at the bottom wall of light cup. The lens is at least partially arranged in the light cup to surround light emitting chip, and at least partially distributes in the light cup outside. The surface of the lens outside the light cup is at least partially refractive surface, and the refractive surface is aspherical surface. The technical scheme provided by the utility model can give consideration to big light emitting angle and light emitting light intensity uniformity.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, and in particular to an LED lamp bead and a linear floodlight. Background Technology

[0002] In applications such as architectural floodlighting or stage lighting, there are two requirements for projection equipment: one is that the emitted light intensity must be sufficiently uniform to provide a stable lighting effect; the other is that it must have a sufficiently large emission angle so that a single projection device can illuminate a wider area. Therefore, modulation elements are needed to modulate the emitted light from the light-emitting chip, widening the emission angle and improving uniformity. However, often the greater the increase in the emission angle, the greater the need for light refraction, leading to a decrease in the uniformity of the final emitted light intensity. Utility Model Content

[0003] The main purpose of this invention is to propose an LED lamp bead, a linear floodlight, a cylindrical lens, and a floodlight assembly, which aims to balance a large light emission angle and uniform light intensity.

[0004] To achieve the above objectives, the present invention provides an LED lamp bead comprising a bracket, a light-emitting chip, and a lens. The bracket forms a reflector. The light-emitting chip is disposed on the bottom wall of the reflector. The lens is disposed at the rim of the reflector. At least a portion of the surface of the lens facing away from the light-emitting chip is a refractive surface, and the refractive surface is aspherical.

[0005] Using a spherical refractive surface to modulate the emitted light from the light-emitting chip and the reflected light from the reflector is difficult to achieve sufficient uniformity when the light is emitted at large angles. This is because the spherical refractive surface only has the ability to uniformly modulate paraxial rays. For extended light sources, there are often many non-paraxial rays that need to be modulated; and the emitted light from the light-emitting chip and the reflected light from the reflector constitute an extended light source relative to the refractive surface.

[0006] The technical solution of this application uses an aspherical refractive surface to modulate the emitted light from the light-emitting chip and the reflected light from the reflector. Since the position on the aspherical refractive surface that is far from the optical axis does not have to be spherical, it can produce differentiated modulation for light rays with different degrees of off-axis. Therefore, the overall emitted light can still have high light intensity uniformity when emitted at a large angle.

[0007] In some embodiments, the depth of the reflector cup is greater than or equal to 0.3 mm and less than or equal to 0.4 mm; the ratio of the depth of the reflector cup to the height of the lens from the surface of the support is greater than or equal to 0.35:1.03 and less than or equal to 0.35:0.95.

[0008] In some embodiments, the angle between the sidewall of the reflector and the bottom wall of the reflector is greater than or equal to 80° and less than or equal to 90°.

[0009] In some embodiments, the light-emitting chip includes a red light chip, a green light chip, and a blue light chip; the red light chip, the green light chip, and the blue light chip overlap each other and are distributed from the bottom wall of the reflector cup to the rim of the reflector cup.

[0010] In some embodiments, the generatrix of the refracting surface satisfies the following equation: y=A1*exp(-x / t1)+A2*exp(-x / t2)+A3*exp(-x / t3)+y0 Where y0=1.04424, A1=-0.00309, t1=-0.42174, A2=-4.18868*10^(-20), t2=-0.03148, A3=-0.03231, t3=-0.42669.

[0011] In some embodiments, the support includes a PCT element for forming the reflector cup.

[0012] This utility model also proposes a first type of linear floodlight, including the aforementioned LED beads, wherein there are multiple LED beads, and at least some of the multiple LED beads are arranged in a grid pattern and / or a triangular pattern.

[0013] This utility model also proposes a second type of linear floodlight, including a cylindrical lens and an LED. The cylindrical lens has a first refractive surface and a second refractive surface arranged opposite each other in the radial direction along the length of the cylindrical lens. The LED is disposed on the side of the second refractive surface opposite to the first refractive surface and is used to project light onto the second refractive surface. The first refractive surface has a radius of curvature greater than or equal to 7.5 mm and less than or equal to 8 mm. And / or, the second refractive surface is a free-curve translation surface.

[0014] In some embodiments, the first refractive surface includes a first refractive region, a second refractive region, and a transition region, all distributed along the length of the cylindrical lens; the curvature centers of the first and second refractive regions are both facing the second refractive surface; the transition region is disposed between the first and second refractive regions, and its curvature center faces away from the second refractive surface; the curvature center of the second refractive surface faces away from the first refractive surface, and the point of maximum curvature is opposite to the transition region along the optical axis of the cylindrical lens.

[0015] In some embodiments, the first refractive surface and the second refractive surface are mirror-symmetrical about the plane of symmetry defined with respect to the longitudinal direction and the optical axis direction of the cylindrical lens.

[0016] In some embodiments, along the optical axis of the cylindrical lens, the distance between the bottom of the first refractive surface and the bottom surface of the cylindrical lens is greater than or equal to 1.7 mm and less than or equal to 3 mm.

[0017] In some embodiments, the generatrix of the second refractive surface satisfies the equation: y=A1*x^6+A2*x^5+A3*x^4+A4*x^3+A5*x^2+A6*x+A7 Among them, A1=-0.2496, A2=1.3073, A3=-2.7384, A4=2.6219, A5=-1.6068, A6=0.2096, and A7=3.9039.

[0018] In some embodiments, the linear floodlight further includes a light-shielding element disposed at at least one end of the cylindrical lens and used to block the light emitted from the end face of the cylindrical lens; and / or The linear floodlight also includes a light mixing cover, which is disposed on the side of the first refractive surface facing away from the second refractive surface and is used to receive the emitted light from the first refractive surface. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 An exploded structural diagram of the first embodiment of the LED lamp bead provided by this utility model; Figure 2 A top view of the first embodiment of the LED lamp bead provided by this utility model; Figure 3 The first embodiment of the LED lamp bead provided by this utility model is as follows: Figure 2 Schematic diagram of the cross-sectional structure in the AA direction; Figure 4 A cross-sectional structural schematic diagram of the second embodiment of the LED lamp bead provided by this utility model; Figure 5A schematic diagram of the first embodiment of the first linear floodlight provided by this utility model; Figure 6 A schematic diagram of the second embodiment of the first linear floodlight provided by this utility model; Figure 7 A schematic diagram of the third embodiment of the first linear floodlight provided by this utility model; Figure 8 A three-dimensional structural diagram illustrating an embodiment of the cylindrical lens provided by this utility model; Figure 9 for Figure 8 A schematic diagram of the front view of the cylindrical lens in the image; Figure 10 A front view structural schematic diagram of the first embodiment of the second linear floodlight provided by this utility model; Figure 11 A top view of the second embodiment of the second linear floodlight provided by this utility model; Explanation of icon numbers: The first type of linear floodlight 100; 10 LED beads; 10R red LED beads; 10G green LED beads; 10B blue LED beads; 10W white LED beads; 11; 111; 111a; 111b; 112; PCT element; LED chip 12; Red LED chip 12R; Green LED chip 12G; Blue LED chip 12B; Lens 13; Refractive surface 131; Mounting component 110; The second type of linear floodlight 200; LED chip 210; light shield 220; light mixer 230; housing 240; circuit board 250; Cylindrical lens 20; First refractive surface 21; First refractive region 21a; Second refractive region 21b; Transition region 21c; Second refractive surface 22; Optical axis o.

[0021] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0023] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] This utility model proposes an LED lamp bead.

[0026] Please refer to Figure 1 , Figure 2 and Figure 3 The LED lamp bead 10 proposed in this utility model includes a bracket 11, a light-emitting chip 12, and a lens 13. The bracket 11 forms a reflector 111. The light-emitting chip 12 is disposed on the bottom wall 111a of the reflector. The lens 13 is disposed at the mouth of the reflector 111. At least a portion of the surface of the lens 13 facing away from the light-emitting chip 12 is a refractive surface 131, and the refractive surface 131 is an aspherical surface.

[0027] The bracket 11 is a component for mounting the light-emitting chip 12. Generally, the bracket 11 may also include a conductor portion to supply power to the light-emitting chip 12, but for ease of illustration, the conductor portion is not shown in the accompanying drawings. The bracket 11 forms a reflector cup 111. This can be achieved by having a main body portion serving as a support structure, with an additional cup-shaped element connected to the main body to form the reflector cup 111; alternatively, the bracket 11 itself may have a high reflectivity, and a portion of it may be manufactured in a cup shape to form the reflector cup 111; or the bracket 11 itself may have a low refractive index, while the lens 13 has a high refractive index, with a total internal reflection surface formed at the junction of the lens 13 and the bracket 11, and this total internal reflection surface being cup-shaped to form the reflector cup 111.

[0028] It should be noted that the above three methods of implementing the reflector cup 111 do not contradict each other. In one example, the bracket 11 itself has high reflectivity, while the refractive index of the bracket 11 is less than that of the lens 13. In this way, the reflectivity of the bracket 11 itself can be utilized, and the principle of total internal reflection can also be used for reflection.

[0029] In one example, the bracket is a cup-type bracket, and it is made of copper. Silver plating can also be applied to the copper, which can be used for circuit connections and / or heat dissipation. The reflector cup of the cup-type bracket can be a PCT (polyethylene terephthalate) component, which serves a reflective function and also provides an interface for bonding with die-attach adhesive.

[0030] The cup-shaped reflector 111 naturally has a bottom wall and an opening opposite the bottom wall. The light-emitting chip 12 is set on the bottom wall 111a of the reflector and can be reflected by the bottom wall 111a and the side wall 111b of the reflector to concentrate the light to be emitted towards the mouth of the cup.

[0031] The lens 13 is positioned near the rim of the reflector cup 111. In one example, part of the lens 13 is positioned inside the reflector cup 111, with the portion inside surrounding the light-emitting chip 12 (the light-emitting chip 12 and the lens 13 may be in contact or spaced apart), while another portion is positioned outside the reflector cup 111. In another example, the lens 13 is completely outside the reflector cup 111, but substantially or completely covers the rim.

[0032] The light-emitting chip 12 is a light-emitting device that emits photons by means of band transitions when electrons cross different types of semiconductors, namely LED (Light-emitting Diode).

[0033] The refractive surface 131 is an interface that can modulate the light path of the light emitted from the light-emitting chip 12. The surface shape of the refractive surface 131, the refractive index of the lens 13, and the refractive index of the medium surrounding the lens 13 determine the modulation method of the light by the refractive surface 131. Among them, the surface shape determines the angle at which the light enters the refractive surface 131, while the refractive indices on both sides of the refractive surface 131 determine the deflection angle.

[0034] The surface shape of the refractive surface 131 is aspherical. An aspherical surface is a surface of revolution, which is a surface of revolution that can be formed by rotating a planar curve around a specified axis. The surface swept by this curve is called a surface of revolution. Mathematically, this curve is called the generatrix of the surface of revolution, and the generatrix can be a univariate function curve. It can be seen that the surface shape of the refractive surface 131 can have a different curvature from the optical axis at least in some non-paraxial positions. This allows for differentiated modulation of non-paraxial light (compared to the rotational symmetry axis of the aspherical surface or the non-paraxial optical axis of the LED chip), enabling the LED chip to have high light intensity uniformity even with a large light emission angle.

[0035] Please refer to Figure 3 In some embodiments, the depth of the reflector cup 111 is greater than or equal to 0.3 mm and less than or equal to 0.4 mm.

[0036] The depth of the reflector cup 111 refers to the vertical distance from the rim of the reflector cup 111 to the bottom wall 111a of the reflector cup. Specifically, any point on the edge of the rim can be selected and projected onto the bottom wall 111a of the reflector cup. The length of the projection is the distance between that point and the bottom wall. The maximum value among all the distances between the rim of the cup and the bottom wall is selected as the depth of the reflector cup 111.

[0037] In some embodiments, the bottom wall 111a of the reflector cup may not be a plane but a curved surface. In this case, a cross-section of the bottom wall of the reflector cup 111 that is perpendicular to the optical axis of the LED bead 10 can be selected to replace the bottom wall, and the above projection can be performed to determine the depth of the reflector cup 111.

[0038] exist Figure 3 In the embodiment shown, distance D is the depth of reflector 111.

[0039] The depth of the reflector cup 111 roughly determines the height of the side wall 111b of the reflector cup. The higher the height of the side wall 111b of the reflector cup, the easier it is to block the large-angle (large angle with the optical axis) emitted light from the light-emitting chip 12. Therefore, the height of the reflector cup 111 is made less than or equal to 0.4mm so that the large-angle emitted light can be emitted normally and modulated by the refractive surface 131, so that the final emission angle is larger.

[0040] The smaller the height of the side wall 111b of the reflector, the weaker its ability to collect the radial light emitted by the light-emitting chip 12, which may reduce the working efficiency of the LED bead 10. Therefore, the height of the reflector 111 is greater than or equal to 0.3mm, so that the side wall 111b of the reflector can have sufficient ability to collect the emitted light of the light-emitting chip 12, thereby improving the working efficiency of the LED bead 10.

[0041] It is evident that by making the depth of the reflector cup 111 greater than or equal to 0.3mm and less than or equal to 0.4mm, an LED bead 10 with a larger emission angle and higher working efficiency can be obtained.

[0042] In one example, the depth of the reflector cup 111 can be 0.30mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.344mm, 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, or 4.0mm.

[0043] Please refer to Figure 3 In some embodiments, the angle between the sidewall 111b of the reflector and the bottom wall 111a of the reflector is greater than or equal to 80° and less than or equal to 90°.

[0044] The side wall 111b of the reflector cup can be annular. Therefore, the angle between the side wall 111b and the bottom wall 111a of the reflector cup can be the angle between the cross-section of the side wall 111b and the cross-section of the bottom wall 111a of the reflector cup. The cross-section of the bottom wall 111a of the reflector cup can be a cross-section perpendicular to the optical axis of the LED bead 10. The cross-section of the side wall 111b of the reflector cup can be arbitrary. Finally, the average, maximum or minimum value of the angle between the cross-section of the side wall 111b of each reflector cup and the cross-section of the bottom wall 111a of the reflector cup is taken as the angle between the side wall 111b and the bottom wall 111a of the reflector cup. Figure 3 The angle α in is Figure 3 In the embodiment shown, the angle formed by the side wall 111b of the reflector relative to the bottom wall 111a of the reflector.

[0045] The angle of the side wall 111b of the reflector affects the exit angle (angle relative to the optical axis) of the reflected light from the LED chip 12 on the side wall 111b of the reflector. If the exit angle is too large, the light may be directed to the bottom wall 111a of the reflector or the opposite side of the side wall 111b of the reflector (relative to the side where the incident light is located). The light needs to undergo multiple reflections before it enters the refractive surface 131 and is emitted. In the process, it may be lost and reduce the working efficiency. Therefore, controlling the angle between the side wall 111b of the reflector and the bottom wall 111a of the reflector to be less than or equal to 90° can ensure the working efficiency of the LED bead 10.

[0046] If the aforementioned emission angle is too small, the light will be emitted approximately parallel to the optical axis of the LED bead 10 towards the refraction surface 131. It is understood that the original emitted light from the light-emitting chip 12 generally has the highest intensity along the optical axis and does not need to be enhanced by the reflected light from the sidewall 111b of the reflector. Conversely, the large-angle emitted light from the light-emitting chip 12 often has lower intensity and is suitable for enhancement. Therefore, controlling the angle between the sidewall 111b of the reflector and the bottom wall 111a of the reflector to be greater than or equal to 80° allows the reflected light from the sidewall 111b of the reflector to be emitted at a large angle, supplementing the edge light intensity and improving the uniformity of the emitted light.

[0047] In summary, the angle between the side wall 111b of the reflector and the bottom wall 111a of the reflector is greater than or equal to 80° and less than or equal to 90°, which makes the LED beads 10 more efficient and the emitted light intensity more uniform.

[0048] In one example, the angle between the side wall 111b of the reflector and the bottom wall 111a of the reflector can be 80°, 81°, 82°, 83°, 84°, 85°, 86°, 87°, 88°, 89° or 90°.

[0049] Please refer to Figure 3 In some embodiments, the ratio of the depth of the reflector cup 111 to the height of the lens 13 from the surface of the support 11 is greater than or equal to 0.35:1.03 and less than or equal to 0.35:0.95.

[0050] The method for measuring the depth of the reflector cup 111 can be referred to above. The height of the lens 13 from the surface of the bracket 11 can be: make two reference planes perpendicular to the optical axis of the LED bead 10, one of which is on the side of the lens 13 facing away from the LED bead 10 and intersects the surface of the lens 13 exactly; the other reference plane is on the side of the bracket 11 facing the lens 13 and intersects the bracket 11 exactly; the distance between these two reference planes is the height of the lens 13 from the surface of the bracket 11.

[0051] exist Figure 3 In the embodiment shown, H1 is the height of lens 13 from the surface of support 11.

[0052] The refractive surface 131 of lens 13 can finely modulate light, while the side wall 111b of the reflector cup can effectively collect the radial (perpendicular to the optical axis) light emitted from the light-emitting chip 12. However, since lens 13 modulates light by refraction, it often lacks effective modulation capability for the radially emitted light from the light-emitting chip 12.

[0053] Therefore, if the ratio of the depth of the reflector cup 111 to the height of the lens 13 from the surface of the support 11 is too large, the light emitted from the light-emitting chip 12 within a small angular range can be directly modulated by the refractive surface 131, resulting in a decrease in the uniformity of the emitted light intensity. If the ratio of the depth of the reflector cup 111 to the height of the lens 13 from the surface of the support 11 is too small, the ability of the side wall 111b of the reflector cup to collect edge light (radial emitted light from the light-emitting chip 12) is weakened, resulting in a decrease in working efficiency. At the same time, since the edge light cannot be effectively modulated by the lens 13, the uniformity of the emitted light will also decrease.

[0054] It can be seen that by making the ratio of the depth of the reflector cup 111 to the height of the lens 13 from the surface of the bracket 11 greater than or equal to 0.35:1.03 and less than or equal to 0.35:0.95, the LED beads 10 with more uniform light intensity and higher working efficiency can be obtained.

[0055] In one example, the ratio of the depth of the reflector cup 111 to the height of the lens 13 from the surface of the support 11 can be 0.35:1.03, 0.35:1.02, 0.35:1.01, 0.35:1.00, 0.35:0.99, 0.35:0.98, 0.35:0.97, 0.35:0.96, or 0.35:0.95.

[0056] Please refer to Figure 4 In some embodiments, the light-emitting chip 12 includes a red light chip 12R, a green light chip 12G, and a blue light chip 12B. The red light chip 12R, the green light chip 12G, and the blue light chip 12B overlap each other and are distributed from the bottom wall 111a of the reflector cup to the rim of the reflector cup 111.

[0057] The red light chip 12R is used to emit red light; the green light chip 12G is used to emit green light; and the blue light chip 12B is used to emit blue light. All three can be 3528 monochrome wide-angle chips.

[0058] The red light chip 12R, green light chip 12G, and blue light chip 12B overlap, meaning their arrangement is along the optical axis of the LED bead 10. This eliminates the spatial gap between the three light-emitting chips 12 in the direction perpendicular to the optical axis, preventing the portion of the emitted light spot (the light spot formed when the emitted light illuminates the plane) formed by the red light chip 12R, green light chip 12G, and blue light chip 12B from not overlapping. This also eliminates the rainbow effect.

[0059] It should be noted that although it is said that the red light chip 12R, the green light chip 12G, and the blue light chip 12B overlap, the order in which they are arranged is not specified; Figure 4In the embodiment shown, the three are arranged from top to bottom as red light chip 12R, green light chip 12G, and blue light chip 12B. However, in other embodiments, the arrangement could be blue light chip 12B, green light chip 12G, and red light chip 12R, or green light chip 12G, blue light chip 12B, and red light chip 12R, etc.

[0060] In addition, COB (Chip On Board) packaging technology can be used to package the three chips onto the bracket 11.

[0061] Please refer to Figure 2 and Figure 3 In some embodiments, the orthographic projection of the refractive surface 131 onto the rim of the reflector 111 covers the rim of the reflector 111. Alternatively, it can be considered that the orthographic projection of the refractive surface 131 along the optical axis of the LED bead 10 onto the rim of the reflector 111 can cover the rim of the reflector 111.

[0062] This provides a certain degree of redundancy for the refractive surface 131, avoiding the need for optical path modulation at the position of the refractive surface 131 near the edge of the lens 13, reducing the influence of the edge effect of the lens 13, and improving the light projection effect.

[0063] Please refer to Figure 3 In some embodiments, the generatrix of the refractive surface 131 satisfies the equation: y=A1*exp(-x / t1)+A2*exp(-x / t2)+A3*exp(-x / t3)+y0 Where y0=1.04424, A1=-0.00309, t1=-0.42174, A2=-4.18868*10^(-20), t2=-0.03148, A3=-0.03231, t3=-0.42669.

[0064] The equation forms a spline curve, which is the graph of the equation in a rectangular coordinate space where x is the abscissa and y is the ordinate. The portion of the equation where x ≥ 0 and y ≥ 0 can be selected and applied to the generatrix of the refractive surface 131, and rotated around the y-axis to obtain the surface shape of the refractive surface 131. Testing has shown that this surface shape of the refractive surface 131 can achieve uniform light emission within a 150° range.

[0065] Please refer to Figure 1 and Figure 3 In some embodiments, the support 11 includes a PCT element 112 for forming a reflector cup 111.

[0066] PCT element 112 is a component made of PCT (Polycyclohexylenedimethylene Terephthalate), which can have high reflectivity, for example, a reflectivity of up to 91%, and can produce a total internal reflection effect, further improving reflectivity; specifically, in Figure 3 In the illustrated embodiment, the PCT element 112 can redirect light emitted from the light-emitting chip 12 at an angle greater than 140° to a region with an emission angle between 90° and 180° through total internal reflection, effectively enhancing the light intensity of the central spot by approximately 25%. The PCT element can also provide an interface for bonding with the die-attach adhesive.

[0067] PCT element 112 can form the main body of the bracket 11 mentioned above, or it can be formed as a separate element constituting the reflector cup 111, and is supported by the main body of the bracket 11.

[0068] Figure 3 The LED chip 10 of the illustrated embodiment can be used in floor-standing ambient wall washer luminaires (the first type of linear floodlight 100 mentioned below can be such a luminaire). The luminaire structure may include the LED chip 10 (which may be an LED chip using a standard 3528 package 0.2W monochromatic light-emitting chip), a diffuser, and a long strip profile. The LED chip 10 can be attached to a flexible light board, and the flexible light board is inserted into the diffuser sleeve for fixation. The light-emitting chip 12 of the LED chip 10 is immersed in silicone (i.e., immersed in the lens 13). The bracket 11 adopts a PCT high reflectivity bracket with a reflectivity of 91%. The side wall 111b of the reflector cup can be a ring structure with a depth of 0.35mm and an inclination angle of 85°. The lens 13 can be a freeform spherical lens with a height of 1mm and a bottom radius of 1.35mm. The refractive surface 131 of lens 13 can also be formed by rotating a spline curve with a radius of curvature of 0.83 mm. Lens 13 can be made of silicone resin with a refractive index of 1.53. Light rays are compressed to 150° after passing through the spherical lens, or set to other angles as needed. The depth of reflector cup 111 can also be 0.344 mm, which can obtain an LED bead with a 140° emission angle and a uniform light distribution curve (its edge light decay can be within 20%).

[0069] Please refer to Figure 5 This utility model also proposes a first type of linear floodlight 100, which includes the aforementioned LED beads 10. The specific structure of the LED beads 10 is as described in the above embodiments. Since this linear floodlight adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0070] A linear floodlight is a strip-shaped floodlight, and may also include a strip-shaped mounting element 110. The mounting element 110 may have components such as a circuit board 250, a housing 240, and / or wiring to provide installation, power supply, and protection functions for the LED beads 10. Multiple LED beads 10 are arranged on the mounting element 110, and at least some of the LED beads 10 are arranged along the length of the mounting element 110.

[0071] Please refer to Figure 6 In some embodiments, there are multiple LED beads, and at least some of the multiple LED beads are arranged in a triangular pattern.

[0072] Each LED bead can be monochromatic (monochromatic means that the emitted color cannot be adjusted). The LED beads can include a green LED bead 10G for emitting green light, a red LED bead 10R for emitting red light, a blue LED bead 10B for emitting blue light, and a white LED bead 10W for emitting white light; among which the white LED bead 10W can be an LED bead equipped with a 2835 white light dual color temperature chip.

[0073] A combination of multi-colored LED beads can create colored light output, meaning a linear floodlight can emit colored light. Furthermore, by modulating the light intensity of LED beads of different colors, different colors can be emitted. Figure 6 As can be seen, an LED combination arranged in a triangular pattern can consist of four LEDs emitting red, green, blue, and white colors. This arrangement has a high degree of symmetry and can improve the color mixing effect.

[0074] Please refer to Figure 7 In some embodiments, there are multiple LED beads, and at least some of the multiple LED beads are arranged in a grid pattern.

[0075] As can be seen, four LED beads arranged in a grid pattern can also emit red, green, blue, and white light. The grid pattern offers greater compactness, which helps the linear floodlight emit higher intensity light. Figure 7 In the embodiment shown, the 10W white LED bead can be a 4000K white LED bead.

[0076] Linear floodlights can also be used as architectural floodlights or to provide general illumination. Therefore, they may require a large emission angle and the ability to modify the color of their emitted light. Linear floodlights can also use cylindrical lenses to modulate the emitted light; similar to lenses mentioned above, a large emission angle is required, necessitating a greater degree of modulation of the light by the cylindrical lens. The greater the modulation effect of the cylindrical lens on the emitted light of the linear floodlight, the more pronounced the chromatic aberration, leading to problems such as rainbow patterns and reducing the uniformity of light mixing in the floodlight.

[0077] Please refer to Figure 8 , Figure 9 and Figure 10 The present invention also proposes a second type of linear floodlight 200, including a cylindrical lens 20 and an LED 210. The cylindrical lens 20 has a first refractive surface 21 and a second refractive surface 22 arranged opposite to each other in the radial direction along the length direction of the cylindrical lens 20. The LED 210 is disposed on the side of the second refractive surface 22 facing away from the first refractive surface 21 and is used to project light onto the second refractive surface 22. The first refractive surface 21 has a radius of curvature greater than or equal to 7.5 mm and less than or equal to 8 mm. And / or, the second refractive surface 22 is a free-curve translation surface.

[0078] The cylindrical lens 20 is a long, narrow lens 13; please refer to... Figure 10 Multiple LED chips 210 can be used in conjunction with the cylindrical lens 20, and at least some of the LED chips 210 are arranged along the length of the cylindrical lens 20. Thus, different parts of the cylindrical lens 20 along its own length can distribute light to different LED chips 210. The cylindrical lens 20 can be made of materials such as PMMA or PC to distribute light through refraction.

[0079] The first refractive surface 21 and the second refractive surface 22 are two surfaces distributed along the length of the cylindrical lens 20; the radial direction of the cylindrical lens 20 is perpendicular to its length, and the first refractive surface 21 and the second refractive surface 22 are also distributed on two radially opposite sides of the cylindrical lens 20. It can be seen that the optical axis o of the cylindrical lens 20 is in its own radial direction.

[0080] The first refractive surface 21 and the second refractive surface 22 are essentially cylindrical. The first refractive surface 21 can be either a cylindrical surface or an irregular cylindrical surface. For example, it can be a surface swept out by translating a conic section (or adding a polynomial) along the normal direction of its own plane. Alternatively, it can be a free-form surface, that is, it does not have mirror symmetry with respect to both the optical axis direction and the extension direction of the cylindrical lens 20 (it may or may not have translational symmetry along the length direction of the lens 13).

[0081] When the first refractive surface 21 is a regular cylindrical surface, the radius of curvature can refer to the curvature of any point on the surface; when the first refractive surface 21 is an irregular curved surface, the radius of curvature can refer to the average radius of curvature.

[0082] Specifically, when the first refractive surface 21 includes a first refractive region 21a, a second refractive region 21b, and a transition region 21c (refer to the embodiments below), the first refractive region 21a and the second refractive region 21b can be regular cylindrical surfaces. Therefore, the radius of curvature of the first refractive surface 21 can refer to the radius of curvature of any point on the first refractive region 21a and the second refractive region 21b. In other embodiments, the first refractive surface 21 or the second refractive surface 22 can also be composed of multiple refractive regions with the same curvature (similar to the first refractive region 21a and the second refractive region 21b). In this way, the radius of curvature of both can be the radius of curvature of any refractive region, while the transition region 21c connecting the refractive regions is not considered.

[0083] If the radius of curvature of the first refractive surface 21 is greater than or equal to 7.5 mm and less than or equal to 8 mm, then the first refractive surface 21 can have sufficient modulation capability for the emitted light without causing excessive dispersion, thus balancing the uniformity of large-angle light emission and light mixing.

[0084] In one example, the radius of curvature of the first refractive surface 21 can be 7.50 mm, 7.56 mm, 7.60 mm, 7.66 mm, 7.70 mm, 7.76 mm, 7.80 mm, 7.86 mm, 7.90 mm, 7.96 mm, or 8.00 mm.

[0085] The second refractive surface 22 is a free-curve translation surface. A free-curve translation surface is a surface created by translating a free curve along the normal direction of the plane containing that curve. It is evident that a free-curve translation surface can possess asymmetrical characteristics. The rainbow effect may also be caused by the misalignment of LEDs emitting different colors. Therefore, due to its asymmetry, the free-curve translation surface can adaptively adjust to different LED arrangements, reducing the rainbow effect caused by misalignment and ensuring high light mixing uniformity while maintaining wide-angle light emission.

[0086] When the radius of curvature of the first refractive surface 21 is greater than or equal to 7.5 mm and less than or equal to 8 mm, and the second refractive surface 22 is a free curve translation surface, then the first refractive surface 21 and the second refractive surface 22 can share the task of modulating the light, achieving more refined modulation and improving the color mixing and light intensity uniformity of the emitted light.

[0087] Please refer to Figure 9In some embodiments, the first refractive surface 21 includes a first refractive region 21a, a second refractive region 21b, and a transition region 21c, all distributed along the length of the cylindrical lens 20. The curvature centers of the first refractive region 21a and the second refractive region 21b are both facing the second refractive surface 22. The transition region 21c is disposed between the first refractive region 21a and the second refractive region 21b, and its curvature center faces away from the second refractive surface 22. The curvature center of the second refractive surface 22 faces away from the first refractive surface 21, and the point of maximum curvature is opposite to the transition region 21c along the optical axis of the cylindrical lens 20.

[0088] The transition region 21c, which is the boundary connecting the first refractive region 21a and the second refractive region 21b, can be shaped as follows: Figure 9 The linear shape shown (due to) Figure 9 (This is a front view, so it appears as a dot in the figure). In other embodiments, the transition region 21c can also be planar, that is, similar to the planar shape of the first refractive region 21a and the second refractive region 21b, except that the center of curvature faces away from the second refractive surface 22.

[0089] Since the first refractive region 21a and the second refractive region 21b are equivalent to the sub-refractive regions of the first refractive surface 21, the above-described implementation of the surface shape of the first refractive surface 21 can be applied to the first refractive region 21a and the second refractive region 21b.

[0090] In this type of implementation, the cylindrical lens 20 takes the shape of a "cylindrical peanut" lens 13, which can achieve large-angle and uniform light output.

[0091] Please refer to Figure 9 In some embodiments, the first refractive surface 21 and the second refractive surface 22 are mirror-symmetrical about the plane of symmetry defined by the length direction of the cylindrical lens 20 and the optical axis o direction of the cylindrical lens 20.

[0092] exist Figure 9 In the diagram, the optical axis o is represented by a dashed line. Since the length direction of the cylindrical lens 20 is perpendicular to the plane of the paper, the optical axis o can also represent the aforementioned plane of symmetry.

[0093] As can be seen, with the mirror symmetry design, only half (left or right side in the figure) of the first refractive surface 21 and the second refractive surface 22 needs to be designed to determine the overall surface shape of the first refractive surface 21 and the second refractive surface 22. The design is simple and easy to implement.

[0094] Please refer to Figure 9 In some embodiments, along the optical axis of the cylindrical lens 20, the distance between the bottom of the first refractive surface 21 and the bottom surface of the cylindrical lens 20 is greater than or equal to 1.7 mm and less than or equal to 3 mm.

[0095] The distance between the bottom of the first refractive surface 21 and the bottom surface of the cylindrical lens 20 can be confirmed by two reference surfaces. Both reference surfaces are perpendicular to the optical axis of the cylindrical lens 20. One reference surface is located on the side of the first refractive surface 21 facing the second refractive surface 22 and intersects the first refractive surface 21 exactly. The other reference surface is located on the side of the cylindrical lens 20 where the second refractive surface 22 is provided and intersects the cylindrical lens 20 exactly. The distance between the two reference surfaces is the distance between the bottom of the first refractive surface 21 and the bottom surface of the cylindrical lens 20. Figure 9 In the diagram, the distance is represented by H2.

[0096] Because the radius of curvature of the first refractive surface 21 is greater than 7.5 in the technical solution of this application, the first refractive surface 21 is relatively flat. If the distance between the bottom of the first refractive surface 21 and the bottom surface of the cylindrical lens 20 is too small, the distance between the first refractive surface 21 and the second refractive surface 22 will be too close, making the cylindrical lens 20 thinner and more easily damaged. If the distance between the bottom of the first refractive surface 21 and the bottom surface of the cylindrical lens 20 is too large, the lamp bead 210 ( Figure 10 As shown, the edge rays emitted can easily enter the portion of the cylindrical lens 20 where light modulation is not possible (i.e., the location where neither the first refractive surface 21 nor the second refractive surface 22 is provided, for example...). Figure 9 (The range defined by H2) results in this portion of the light being wasted.

[0097] It can be seen that making the distance between the bottom of the first refractive surface 21 and the bottom surface of the cylindrical lens 20 greater than or equal to 1.7 mm and less than or equal to 3 mm can ensure that the cylindrical lens 20 has sufficient strength and improve the working efficiency of the cylindrical lens 20 (avoiding light waste).

[0098] In one example, the distance between the bottom of the first refractive surface 21 and the bottom surface of the cylindrical lens 20 can be 1.7mm, 1.9mm, 2.0mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.8mm, 2.9mm, or 3.0mm.

[0099] Figure 8The cylindrical lens 20 of the illustrated embodiment can be applied to a TV viewing light column (the second type of linear floodlight 200 mentioned below can be this type of light column). Viewing light columns are typically pillars placed on either side of a TV or computer. The viewing light column can be placed 20cm away from the wall, and the wall washing width can be 70cm. The cylindrical lens 20 can be used for secondary light distribution to increase the wall washing width by 1.5 times. The LEDs in the viewing light column can be conventional 3528RGB three-in-one LEDs, and a cylindrical polarizing lens (i.e., cylindrical lens 20) can be configured on the light-emitting side of the LEDs. The radius of curvature of the inner surface of the lens (i.e., the second refractive surface 22) can be 8.94mm, the step height (i.e., the distance between the bottom of the first refractive surface 21 and the bottom surface of the cylindrical lens 20) can be 2.3mm, and the radius of curvature of the outer surface (i.e., the first refractive surface 21) can be 7.56mm. When the light from the LED bead passes through the inner surface, it can be deflected by 5° for the first time. When the light exits the outer surface, the angle can change from 60° to 75°, so the overall beam angle is 150°.

[0100] In some implementations, the generatrix of the second refractive surface satisfies the following equation: y=A1*x^6+A2*x^5+A3*x^4+A4*x^3+A5*x^2+A6*x+A7 Among them, A1=-0.2496, A2=1.3073, A3=-2.7384, A4=2.6219, A5=-1.6068, A6=0.2096, and A7=3.9039.

[0101] The above equation is a curve on the rectangular coordinate xOy plane. The part of it with y≥0 can be translated along the normal direction (or z-axis direction) of the xOy plane. The surface shape swept out by this part is the surface shape of the second refraction surface.

[0102] As can be seen, the above equation is in polynomial form, where the terms with odd exponents introduce asymmetry (asymmetry relative to the y-axis) into the surface shape of the second refractive surface. This allows the second refractive surface to adaptively adjust the modulation of light emitted from LEDs at different positions, resulting in better color mixing uniformity while emitting light at large angles. Actual measurements show that high uniformity can be maintained even at a light emission angle of 150°.

[0103] In some embodiments, the lamp bead 210 can be an LED (Light Emitting Diode), an LD (Laser Diode), an incandescent lamp, or a fluorescent lamp, etc. The lamp bead 210 projects light onto the second refractive surface 22, that is, the second refractive surface 22 serves as the incident surface of the cylindrical lens 20, while the first refractive surface 21 serves as the exit surface of the cylindrical lens 20.

[0104] The linear floodlight may also include a housing 240, providing a mounting base for the cylindrical lens 20. A circuit board 250 may also be housed within the housing 240 to power the LEDs 210 or control their illumination.

[0105] Please refer to Figure 11 In some embodiments, the linear floodlight also includes a light shield 220, which is disposed on at least one end of the cylindrical lens 20 and is used to block the emitted light from the end face of the cylindrical lens 20.

[0106] The light-shielding element 220 can be a light-shielding plate or a light-shielding layer attached to the end face of the cylindrical lens 20. The light-shielding element 220 can have a high reflectivity to reflect light emitted from the edge of the cylindrical lens 20 back to the cylindrical lens 20; the light-shielding element 220 can have a high light absorption rate so that it can absorb the light emitted from the edge of the cylindrical lens 20 and convert it into heat dissipation.

[0107] When the light-shielding element 220 has high reflectivity, the emitted light from both ends of the cylindrical lens 13 can be reused to improve the working efficiency of the linear floodlight. When the light-shielding element 220 has high absorptivity, the first refractive surface 21 and the second refractive surface 22 can modulate the light emitted directly from the lamp bead 210, and the light paths of these light rays are more stable, which can improve the intensity of the light spot and the uniformity of color mixing.

[0108] Please refer to Figure 10 In some embodiments, the linear floodlight further includes a light mixing cover 230, which is disposed on the side of the first refractive surface 21 facing away from the second refractive surface 22 and is used to receive the emitted light from the first refractive surface 21. This allows the light mixing cover 230 to further improve the light mixing effect. The light mixing cover 230 can be made of milky white silicone with a light transmittance of 90%.

[0109] Please refer to Figure 10 In some embodiments, the LED 210 is a colored LED. A colored LED is an LED 210 that can emit colored light, such as a 3528 RGB three-in-one LED. Thus, the LED 210 itself has a certain light mixing effect, and with the modulation effect of the cylindrical lens 13, a good light mixing effect and a large light emission angle can be ensured (actual measurements show a light emission angle of up to 150°). Multiple LEDs 210 can be arranged along the length of the cylindrical lens 20.

[0110] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. An LED lamp bead, characterized in that, include: The support structure forms a reflector cup; A light-emitting chip is disposed on the bottom wall of the reflector; A lens is disposed at the mouth of the reflector cup; The surface of the lens facing away from the light-emitting chip is at least partially a refractive surface, and the refractive surface is an aspherical surface.

2. The LED lamp bead as described in claim 1, characterized in that, The depth of the reflector cup is greater than or equal to 0.3 mm and less than or equal to 0.4 mm; and / or, the ratio of the depth of the reflector cup to the height of the lens from the surface of the bracket is greater than or equal to 0.35:1.03 and less than or equal to 0.35:0.

95.

3. The LED lamp bead as described in claim 1, characterized in that, The angle between the side wall of the reflector and the bottom wall of the reflector is greater than or equal to 80° and less than or equal to 90°.

4. The LED lamp bead as described in claim 1, characterized in that, The light-emitting chip includes a red light chip, a green light chip, and a blue light chip; the red light chip, the green light chip, and the blue light chip overlap each other and are distributed from the bottom wall of the reflector cup to the mouth of the reflector cup.

5. The LED lamp bead as described in claim 1, characterized in that, The generatrix of the refracting surface satisfies the following equation: y=A1*exp(-x / t1)+A2*exp(-x / t2)+A3*exp(-x / t3)+y0 Where y0=1.04424, A1=-0.00309, t1=-0.42174, A2=-4.18868*10^(-20), t2=-0.03148, A3=-0.03231, t3=-0.42669.

6. The LED lamp bead as described in any one of claims 1-5, characterized in that, The bracket includes a PCT element for forming the reflector cup.

7. A linear floodlight, characterized in that, Includes LED beads as described in any one of claims 1-6, wherein there are multiple LED beads, and at least a portion of the multiple LED beads are arranged in a grid pattern and / or a triangular pattern.

8. A linear floodlight, comprising a cylindrical lens and an LED, wherein the cylindrical lens has a first refractive surface and a second refractive surface arranged radially opposite to each other along the length of the cylindrical lens, and the LED is disposed on the side of the second refractive surface opposite to the first refractive surface, and is used to project light onto the second refractive surface; wherein, The radius of curvature of the first refracting surface is greater than or equal to 7.5 mm and less than or equal to 8 mm; and / or, the second refracting surface is a free-curve translation surface.

9. The linear floodlight as described in claim 8, characterized in that, The first refractive surface includes a first refractive region, a second refractive region, and a transition region, all distributed along the length of the cylindrical lens. The curvature centers of the first and second refractive regions are both facing the second refractive surface. The transition region is located between the first and second refractive regions, and its curvature center faces away from the second refractive surface. The curvature center of the second refractive surface faces away from the first refractive surface, and the point of maximum curvature is opposite to the transition region along the optical axis of the cylindrical lens.

10. The linear floodlight as described in claim 8, characterized in that, With respect to the plane of symmetry defined by the longitudinal direction and the optical axis direction of the cylindrical lens, both the first refractive surface and the second refractive surface are mirror-symmetrical.

11. The linear floodlight as described in claim 8, characterized in that, Along the optical axis of the cylindrical lens, the distance between the bottom of the first refractive surface and the bottom surface of the cylindrical lens is greater than or equal to 1.7 mm and less than or equal to 3 mm.

12. The linear floodlight as described in claim 8, characterized in that, The generatrix of the second refracting surface satisfies the following equation: y=A1*x^6+A2*x^5+A3*x^4+A4*x^3+A5*x^2+A6*x+A7 Among them, A1=-0.2496, A2=1.3073, A3=-2.7384, A4=2.6219, A5=-1.6068, A6=0.2096, and A7=3.9039.

13. The linear floodlight as described in claim 8, characterized in that, The linear floodlight further includes a light-shielding element disposed at at least one end of the cylindrical lens and used to block the light emitted from the end face of the cylindrical lens; and / or The linear floodlight also includes a light mixing cover, which is disposed on the side of the first refractive surface facing away from the second refractive surface and is used to receive the emitted light from the first refractive surface.

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