Light-condensing LED (light-emitting diode) module

Abstract

The invention provides a condensation LED module which comprises a lamp bead and a dimming assembly arranged on an emergent light path of the lamp bead, the dimming assembly comprises a progressive lens, the progressive lens is provided with an incident plane and an emergent plane, the light extension direction of the lamp bead is from the incident plane to the emergent plane, the progressive lens comprises a concentration point, a first part and a second part, and the first part is arranged on the first part. The distance between the first part and the concentration point is smaller than that between the second part and the concentration point, and the refractive index of the first part is larger than that of the second part. The change of the refractive index enables the light to be gradually guided along the extension direction of the lens, thereby avoiding the sudden change of the light at different parts of the lens, and reducing the distortion of off-axis light. The first part with the high refractive index is beneficial to enhancing the focusing effect of the central area, and the second part with the low refractive index enables the deflection of edge light rays to be more accurate, so that the scattering phenomenon of light beams is reduced, and the definition and the optical efficiency of light spots are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of semiconductor diode light emitting, and in particular relates to a focusing LED module. Background Art

[0002] LED is a device that emits light through electron-hole recombination in semiconductor materials. It applies current to make electrons and holes recombine in semiconductor materials, thereby releasing energy in the form of light. In the use scenarios such as spotlights and searchlights, forming a focused spot of LED emission can make the light brighter and stronger when illuminating the target area, thereby improving the utilization rate of light.

[0003] In the related art, a focused light spot is formed by assembling a convex lens in an LED module. A conventional convex lens refracts light to focus it on a certain focal point. However, when the light does not pass through the convex lens completely along the optical axis, the curvature of the convex lens causes nonlinear refraction of the light after passing through different positions. As a result, the shape of the image formed is stretched or compressed, causing the shape of the light spot to change and distortion to occur. In addition, the overlap of off-axis light at the focal point is poor, causing the light spot to appear blurred near the focal point. Summary of the invention

[0004] The technical purpose of the present invention is to provide a focusing LED module, aiming to solve the problem of light spot shape distortion and light spot blur of the LED module.

[0005] To solve the above technical problems, the present invention is implemented as follows: a focusing LED module includes a lamp bead and a dimming component arranged on the output light path of the lamp bead, the dimming component includes a progressive lens, the progressive lens is provided with an incident surface and an output surface, the light of the lamp bead extends along the incident surface to the output surface, the progressive lens includes a focusing point, a first part and a second part, the distance between the first part and the focusing point is smaller than the distance between the second part and the focusing point, and the refractive index of the first part is greater than the refractive index of the second part.

[0006] In some embodiments of the present invention, the focusing point is located at the body center of the progressive lens.

[0007] In some embodiments of the present invention, the refractive index of the concentrated point is , the distance between any point in the first part or the second part and the concentration point is r, and the refractive index of any point in the first part or the second part is , .

[0008] In some embodiments of the present invention, the dimming component further comprises a front plane lens, which is disposed between the incident surface and the lamp bead, and is used to shape the emitted light of the lamp bead into a parallel light beam. In some embodiments of the present invention, the focal length of the front plane lens is , the distance between the front plane lens and the incident surface is , .

[0009] In some embodiments of the present invention, the dimming component further includes a beam optimizer, which is disposed on a side of the progressive lens close to the exit surface, and the beam optimizer is located at a light convergence point of the progressive lens.

[0010] In some embodiments of the present invention, the beam optimizer includes a rotating axis and a plurality of biconvex lenses with different optical parameters mounted on the rotating axis and arranged at intervals along the axial direction of the rotating axis, and the axial direction of the rotating axis remains parallel to the extension direction of the light.

[0011] In some embodiments of the present invention, a connecting tube is provided between the progressive lens and the beam optimizer, and a peripheral wall of the connecting tube is bent inward.

[0012] Compared with the prior art, the focusing LED module of the present invention has the following beneficial effects: Progressive lenses use a refractive index gradient design. The refractive index of the first and second parts of the progressive lens is different, and changes with the distance from the focal point, and there is an inverse relationship. This change in refractive index can gradually deflect the light when it enters and passes through the progressive lens, rather than a sudden refractive change. This change in refractive index gradually guides the light along the extension direction of the lens, avoiding sudden changes in the light in different parts of the lens and reducing the distortion of off-axis light. The high refractive index of the first part helps to enhance the focusing effect of the central area, and the low refractive index of the second part makes the deflection of the edge light more accurate, reducing the scattering of the light beam, thereby improving the clarity and optical efficiency of the light spot. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic cross-sectional view of a partial structure of a focusing LED module in one embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of a portion of the structure of a central focusing LED module; Figure 3 yes Figure 1 A schematic cross-sectional view of a partial structure of a central focusing LED module in another direction.

[0014] In the accompanying drawings, each reference numeral represents: 100. Focusing LED module; 11. Progressive lens; 111. First part; 112. Second part; 113. Incident surface; 114. Exit surface; 115. Focusing point; 121. Biconvex lens; 122. Rotation axis; 13. Connecting tube. DETAILED DESCRIPTION

[0015] The embodiments of the present invention 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 intended to be used to explain the present invention, but are not to be construed as limiting the present invention. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention.

[0016] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “circumferential”, “radial”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 limiting the present invention.

[0017] In addition, 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0018] Please refer to Figures 1 to 3 The present invention proposes a focusing LED module 100, including a lamp bead and a dimming component arranged on the light path of the lamp bead, the dimming component includes a progressive lens 11, the progressive lens 11 is provided with an incident surface 113 and an exit surface 114, the light of the lamp bead extends along the incident surface 113 to the exit surface 114, the progressive lens includes a focusing point, a first part and a second part, the distance between the first part and the focusing point is smaller than the distance between the second part and the focusing point, and the refractive index of the first part is greater than the refractive index of the second part.

[0019] When the light of the light bead enters the incident surface 113 of the lens vertically or at a certain angle, different regions of the progressive lens 11 refract the light to different degrees due to the difference in refractive index. For example, the first part 111 has a higher refractive index, so the light is refracted at a larger angle here, while the second part 112 has a lower refractive index and the light is refracted at a smaller angle. When the light propagates from the high refractive index region to the low refractive index region, according to Snell's law, the refraction angle increases, so the light gradually deviates from the original propagation direction and gathers toward the center position, thereby causing a convergence phenomenon.

[0020] The progressive lens 11 adopts a refractive index gradient design. The refractive index of the first part 111 and the second part 112 of the progressive lens 11 is different, and changes with the distance from the focus point 115, and there is an inverse relationship. This change in refractive index can gradually deflect the light when it enters and passes through the progressive lens 11, rather than a sudden refractive change. This change in refractive index gradually guides the light along the extension direction of the lens, avoiding sudden changes in the light in different parts of the progressive lens 11 and reducing the distortion of off-axis light. The high refractive index first part 111 helps to enhance the focusing effect of the central area, and the low refractive index second part 112 makes the deflection of the edge light more accurate, reduces the scattering of the light beam, and thus improves the clarity and optical efficiency of the light spot.

[0021] Figure 1 The first part and the second part are for illustration only and do not represent the actual distinction of the refractive index regions. The minimum diameter of the progressive lens 11 at the focus point 115 is determined according to the actual manufacturing process and is not limited here.

[0022] In other embodiments, the structure of the lamp bead includes a light-emitting chip, a substrate, a packaging material, etc. Among them, the light-emitting chip determines the emission angle and brightness of the light beam, and the LED chip can use a high-brightness chip to meet the needs of focusing. The lamp bead includes a heat dissipation substrate for fixing the light-emitting chip and helping to dissipate heat. Efficient heat dissipation is the basis for the stable operation of the lamp bead. In order to protect the chip and improve the emission effect of the light beam, the lamp bead uses a packaging material with good light transmittance, such as silicone or epoxy resin, to encapsulate the light-emitting chip. Other LED structures are prior arts known to those skilled in the art and will not be repeated here.

[0023] Please refer to Figure 1, the focusing point 115 is set at the body center of the progressive lens 111. The focusing point 115 is set at the body center of the progressive lens 11, the first part 111 is close to the focusing point 115 and has a higher refractive index, while the second part 112 is farther away and has a lower refractive index. This design makes the first part 111 close to the focusing point 115 refract the light more strongly, thereby guiding the light to converge. This design can better control the propagation path of the light, thereby enhancing the focusing effect of the light beam, reducing the scattering of the light spot, and forming a clearer light spot.

[0024] In other embodiments, the position of the focus point 115 is at a non-body center position of the progressive lens 11, and the overall light beam will be deflected. This design is very useful in applications where the angle of the light beam needs to be adjusted. For example, in the design of car lights, the irradiation direction of the light beam can be accurately controlled by the asymmetry of the sizes of different areas of the lens, thereby achieving the purpose of improving nighttime driving safety. Similarly, in a projection system, this structure can be used to achieve fine adjustment of the angle of the light beam.

[0025] Due to the different sizes of the two parts, the path and refraction of the light in the lens are uneven, causing the intensity distribution of the light beam to change. In the larger area, the light travels a longer distance, causing the intensity of some light to be weakened, while in the smaller area, the light is more concentrated, forming a higher intensity beam, thus forming a light spot with a gradient brightness distribution as a whole.

[0026] This asymmetric distribution of beam intensity is suitable for scenes that require lighting intensity grading, such as in exhibitions, where the intensity of the beam can be adjusted by the design of the progressive lens 11 so that different parts of the exhibits have different brightness. At the same time, this design can also be used for surgical lights in the medical field to avoid over-irradiation of certain areas.

[0027] The refractive index variation design of the progressive lens 11 can precisely control the propagation path of light. This progressive refraction effect can not only highly concentrate the light beam, but also fine-tune the light in a specific area to achieve the desired beam shape and distribution. Especially in scenarios where precise control of the beam shape is required (such as high-brightness lighting, spotlights), the lens design can significantly improve the focusing ability and control accuracy of the beam.

[0028] The progressive lens 11 gradually adjusts the refraction angle of the light beam through the characteristic of gradually changing refractive index when the light passes through. The design of the focusing point 115 further adjusts the direction of the light beam, which helps to enhance the edge clarity of the light spot and avoid blur or transition at the edge of the light spot.

[0029] The gradient lens 11 has a higher refractive index at the focal point 115 and a lower refractive index at the first portion 111 and the second portion 112. When light passes through the first portion 111 or the second portion 112 with gradually decreasing refractive index, the refraction angle of the light gradually increases as the distance from the focal point 115 increases.

[0030] The design of the progressive lens 11 reduces the optical loss caused by multiple reflections and unnecessary refractions of light. By gradually guiding the light beam using the change in refractive index, it is possible to effectively reduce energy loss in the optical system and improve the efficiency of light utilization.

[0031] The gradual change of the refractive index can not only adjust the direction of the light beam, but also control the edge processing of the light. By designing a gradual change of the refractive index in the edge area, the boundary of the light spot can be made softer, avoiding an overly abrupt edge transition. This design makes the brightness of the light spot gradually weaken in the edge area, thereby achieving a soft transition effect and reducing the generation of glare.

[0032] The design of the progressive lens 11 can be achieved in the following ways, for example, by using computer-aided design software in combination with optical simulation tools to accurately calculate and optimize the distribution of the refractive index. By setting the refractive index values ​​at different positions, a lens structure that meets the optical requirements can be designed. Alternatively, a specific mathematical model, such as exponential distribution, parabolic distribution, linear distribution, etc., can be used to describe the change of the refractive index with position. The specific design software and tools are well known to those skilled in the art and will not be described in detail here.

[0033] The manufacturing of the progressive lens 11 can be achieved in the following ways, for example, during the manufacturing process, one or more materials with different refractive indices are selected and these materials are combined in a certain way. The refractive index of the material is changed by adding dopants of different concentrations into the manufacturing material, such as ion doping or doping with tiny particles. For the dopant in the lens material, the concentration of the dopant can be controlled by a gradient material sintering process, thereby forming a lens whose refractive index changes with position.

[0034] Alternatively, a multilayer structural material may be used, and the refractive index of each layer of material changes gradually. By stacking multiple material layers with different refractive indices, a gradual refractive index change can be achieved. The stacking process uses high-precision thin film deposition technology, such as physical vapor deposition (PVD) or chemical vapor deposition (CVD).

[0035] A laser beam can also be used to irradiate and adjust a specific area of ​​the progressive lens 11, and the refractive index can be changed by changing the microstructure of the material. This technology has the advantages of high precision and non-contact, and is suitable for the production of small lenses. The structure of the above-mentioned specific manufacturing equipment is well known to those skilled in the art and will not be described in detail here.

[0036] The refractive index of the concentrated point 115 is , the distance between any point in the first part 111 or the second part 112 and the concentrated point 115 is r, and the refractive index of any point in the first part 111 or the second part 112 is , . The refractive index n decreases quadratically with increasing distance r, indicating that the central area of ​​the lens has a higher refractive index, and the greater the distance from the center, the lower the refractive index. This distribution of refractive index causes greater refraction of light in the central area, thereby directing the light toward the center. It can enhance the focusing effect of the light beam and concentrate the light beam on the optical axis of the lens, thereby forming a smaller and brighter light spot. k can be 0.001~0.1, and r can be 20~100mm, but not limited to this range. The value is determined according to the specific usage scenario. In the calculation process, the distance r is dimensionless.

[0037] Larger When the value is , the refractive index decreases rapidly with the increase of distance r. The existence of a larger k value means that the refractive index drops more significantly in areas away from the center (i.e., larger r). The rapid drop in refractive index causes the light to refract more violently in different areas of the lens. This change can enhance the focusing ability of the light beam and make the light more concentrated in a focal area.

[0038] In the case of a smaller k value, the refractive index changes more gently, and the refractive index decreases more slowly in the area away from the center of the lens. The gentle change in the refractive index makes the refraction angle of the light change less, which causes the beam to spread more evenly instead of focusing quickly. This situation is suitable for forming a more uniform beam distribution.

[0039] Since the refractive index of the first portion 111 or the second portion 112 As r increases, it gradually decreases, which will cause the refraction angle of light away from the center to become smaller, thereby reducing the divergence trend of light. This design helps to maintain the concentration of the light beam and avoid unnecessary scattering of light at the edge of the lens. Through this refractive index design, the edge light leakage of the light spot can be significantly reduced, the concentration of the light beam can be improved, the edge of the light spot can be made clearer and sharper, and the controllability of the light beam and the lighting effect can be enhanced.

[0040] Depending on the usage scenario, the specific refractive index of the first portion 111 and the second portion 112 The distance r can have different quantitative relationships. When it changes linearly, , where k is the coefficient of refractive index change, and k is 0.001~0.1, such as 0.002, 0.03, etc. A smaller k value can avoid drastic refraction changes, so that the light is gradually deflected in the lens. The linearly changing refractive index can gradually adjust the deflection angle of the light beam, which is suitable for optical designs that need to guide the light to gradually change direction, such as realizing fan-shaped beams or applications of gradual beam diffusion.

[0041] When the refractive index When the change is exponential, , where k is the rate of exponential change, k is 0.01~0.1, such as 0.02, 0.03, etc. The k value determines the rate of attenuation or increase of the refractive index with distance. The larger the k value, the faster the change rate. The change of the exponential refractive index can be used to control the gradual focusing or diffusion of the light beam, which is particularly suitable for scenes that require rapid adjustment of the light propagation path, such as laser shaping or fast focusing optical systems.

[0042] When the refractive index When the Gaussian change occurs, Controls the width of the Gaussian curve, 0.1~5, such as 0.2, 3, etc. Larger Values ​​are suitable for producing soft Gaussian spots, while smaller A smaller value will produce a more concentrated and intense light spot. The refractive index of Gaussian distribution is suitable for forming a light beam with concentrated light in the center and gradually darkening at the edge. It can simulate natural light spots or beam distribution and is used in scenes that require natural transitions, such as soft lighting or background light projection.

[0043] In other embodiments, when the refractive index When it changes in a sinusoidal wave, , where A is the amplitude, A is 0.01~0.1, such as 0.02, 0.03, etc. A directly affects the fluctuation range of the refractive index. A larger A will cause a stronger refraction change, resulting in a larger change in the refraction angle of light inside the lens. k is the frequency of the sinusoidal change, which is used to control the period of the sinusoidal change, and k is 0.1~10, such as 0.2, 3, etc. A larger k value will make the refractive index change more frequently, while a smaller k will make the change slower. The sinusoidal wave-changing refractive index can produce a periodic light refraction effect in the lens, which is used to form special beam shapes or periodic spot effects, such as corrugated, striped, etc. This design is very useful in optical experiments and specific pattern projections.

[0044] In this embodiment, the dimming component also includes a front plane lens, which is arranged between the incident surface 113 and the lamp bead, and is used to shape the emitted light of the lamp bead into a parallel light beam. The function of the front plane lens is to convert the scattered light or divergent light beam emitted by the lamp bead into a parallel light beam. The plane lens corrects the emitted light beam into parallel light by changing the divergence angle of the light, which helps to improve the collimation of the light beam.

[0045] The light directly emitted by the lamp beads is usually a divergent beam, and when the progressive lens 11 processes the divergent beam, the light passes through different areas of the lens and undergoes uneven refraction, resulting in optical distortion or uneven light spots. By correcting the divergent beam into parallel light through a front plane lens, the path difference of the beam in the lens can be reduced, thereby reducing the optical distortion of the lens.

[0046] The beam shaping effect of the progressive lens 11 depends on the direction of the light entering the lens. By shaping the light beam of the lamp bead into parallel light through the front plane lens, the direction of the light entering the progressive lens 11 can be ensured to be uniform, thereby more effectively utilizing the refraction design of the progressive lens 11 to adjust the shape and distribution of the light beam.

[0047] The addition of the front flat lens makes the beam adjustment of the entire optical system more flexible. The collimation of the beam can be changed according to needs by adjusting the focal length and position of the front lens, thereby achieving flexible applications in different scenarios.

[0048] Specifically, the focal length of the front plane lens is , the distance between the front plane lens and the incident surface 113 is , . The focal length of the front plane lens determines the collimation effect of the light after passing through the front lens. The refractive index of the first part 111 and the second part 112 of the progressive lens 11 are designed to be different. The refractive index of the focus point 115 is In order to ensure that the collimated light beam can accurately enter the progressive lens 11 and perform ideal refraction control, the distance The setting needs to be consistent with the refractive index match.

[0049] when When it is larger, it means that the refractive effect of the progressive lens 11 is more obvious. At this time, the distance between the lenses It needs to be shortened appropriately to ensure that the collimated light beam can correctly enter the progressive lens 11 and be refracted.

[0050] when When it is smaller, it means that the refractive effect of the progressive lens 11 is weak, and the distance can be appropriately increased. , allowing the light beam to propagate and refract better in the progressive lens 11.

[0051] For example, for a short focal length lens (such as In the range of 5mm~20mm, for lenses with longer focal lengths (such as Between 100 and 200 mm), by setting the distance reasonably , it can ensure that the parallel light beam maintains a good incident angle when entering the progressive lens 11, and avoid the light beam from diverging too early. This design can improve the refraction effect of the light beam in the lens, thereby optimizing the final light beam output quality.

[0052] In this embodiment, the dimming component further includes a beam optimizer, which is disposed on a side of the progressive lens 11 close to the exit surface 114 . The beam optimizer is located at a light convergence point of the progressive lens 11 .

[0053] The light beam is concentrated at the light convergence point of the progressive lens 11, and further correction is performed by the beam optimizer to enhance the directivity of the light beam and reduce the divergence angle of the light beam. This correction can ensure that the light beam maintains good collimation characteristics after emission, thereby enhancing the illumination effect, and reduces the optical distortion caused by the sudden change of the light at the convergence point, and smoothly guides the light into the emission path.

[0054] The shortcomings of the light convergence point of the gradient lens can be summarized through multiple lighting experiments. Before installing the beam optimizer, multiple lighting experiments are performed to determine the approximate position of the light convergence point, summarize the rules, and obtain the calculation formula for the light convergence point.

[0055] when When the light converges ,in, is the maximum distance between the focus point 115 and the edge of the progressive lens 11, R is the radius of curvature of the progressive lens 11, and the refractive index The quadratic change simulates an equivalent curvature that is approximately spherical. In this case, the gradient lens 11 can be equivalent to a lens with a gradient curvature. The coefficient k of the refractive index change can be regarded as directly related to the optical equivalent curvature, and R is approximately .

[0056] Please refer to Figure 2 and Figure 3In one embodiment, the beam optimizer includes a rotation axis 122 and a plurality of biconvex lenses 121 with different optical parameters arranged at intervals along the axial direction of the rotation axis 122, and mounted on the rotation axis 122. The axial direction of the rotation axis 122 is parallel to the direction in which the light extends. Since the biconvex lens 121 has a focusing characteristic, it can converge the incident light into a more concentrated light beam. The plurality of biconvex lenses 121 are arranged at intervals along the rotation axis 122, so that each lens can independently focus a specific portion of the light beam, thereby forming a stronger focusing effect.

[0057] The focal lengths of the multiple biconvex lenses 121 can be different. The shorter the focal length, the stronger the focusing ability of the lens, and the light beam can be converged to a small focus more quickly. When the focal length is longer, the light beam converges more slowly, which is suitable for applications of long-distance irradiation or larger light spots. The curvature radii of the multiple biconvex lenses 121 can be different. A smaller curvature radius will result in a shorter focal length, thereby enhancing the focusing effect; while a larger curvature radius will increase the focal length, causing the focusing ability of the lens to weaken and the convergence angle of the light beam to be smaller. The refractive index of the multiple biconvex lenses 121 can be different. A higher refractive index will cause the light to be refracted at a larger angle in the lens, enhancing the focusing ability of the lens; while a lower refractive index will reduce the refraction angle of the light, causing the focusing effect of the lens to be weaker. By adjusting the optical parameters of these biconvex lenses 121, the selected biconvex lenses 121 can be precisely controlled by rotating the rotating shaft 122 to optimize the focusing effect to meet the needs of different application scenarios.

[0058] The focal length of the biconvex lens 121 can be 5-50 mm, such as 10 mm, 20 mm, or 50-200 mm, such as 60 mm, 100 mm. Shorter focal lengths are suitable for close-range focusing applications such as microscope lenses and spotlights, while longer focal lengths are suitable for general lighting, projection, and camera lenses.

[0059] For a stronger curved shape, the curvature radius of the biconvex lens 121 can be 5-20 mm, such as 8 mm, 15 mm, which is suitable for short focal length lenses and high focusing applications. For a flatter curved shape, the curvature radius of the biconvex lens 121 can be 20-100 mm, such as 30 mm, 80 mm, which is suitable for lenses with medium or long focal lengths.

[0060] When glass lens materials are used, the refractive index of the biconvex lens 121 and the maximum refractive index of the progressive lens 11 are both between 1.5 and 1.9. When plastic lens materials are used, the refractive index of the biconvex lens 121 and the maximum refractive index of the progressive lens 11 are both between 1.49 and 1.6. When special optical materials (such as certain titanium oxide glass or photonic crystal materials) are used, the refractive index of the biconvex lens 121 and the maximum refractive index of the progressive lens 11 are both between 1.9 and 2.0, and can even reach 2.0 or higher, which is used in scenes that require high focusing or high refractive index requirements.

[0061] Furthermore, a connecting tube 13 is provided between the progressive lens 11 and the beam optimizer, and the peripheral wall of the connecting tube 13 is bent inwardly. The peripheral wall of the connecting tube 13 is bent inwardly, and this design helps to guide and constrain the propagation direction of the light beam inside the connecting tube 13. The internally curved peripheral wall can reduce the reflection and scattering of light on the tube wall and maintain the shape consistency of the light beam. This not only reduces the energy loss of the optical system, but also avoids optical distortion caused by multiple reflections.

[0062] In other embodiments, the biconvex lens 121 may be replaced in a plug-in manner, and different optical adjustment effects may be achieved by plugging biconvex lenses 121 with different optical parameters into the connecting tube 13 .

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A focusing LED module, characterized in that: It includes a lamp bead and a dimming component arranged on the output light path of the lamp bead, the dimming component includes a progressive lens, the progressive lens is provided with an incident surface and an output surface, the light of the lamp bead extends along the incident surface to the output surface, the progressive lens includes a focusing point, a first part and a second part, the distance between the first part and the focusing point is smaller than the distance between the second part and the focusing point, and the refractive index of the first part is greater than the refractive index of the second part.

2. The spotlight LED module according to claim 1, characterized in that: The focusing point is set at the body center position of the progressive lens.

3. The spotlight LED module according to claim 1, characterized in that: The refractive index of the concentrated point is , the distance between any point in the first part or the second part and the concentration point is r, and the refractive index of any point in the first part or the second part is , .

4. The spotlight LED module according to claim 2, characterized in that: The dimming component also includes a front plane lens, which is arranged between the incident surface and the lamp bead, and is used to shape the emitted light of the lamp bead into a parallel light beam.

5. The spotlight LED module according to claim 4, characterized in that: The focal length of the front plane lens is , the distance between the front plane lens and the incident surface is , .

6. The spotlight LED module according to claim 1, characterized in that: The dimming component further includes a beam optimizer, which is arranged on a side of the progressive lens close to the exit surface, and the beam optimizer is located at a light convergence point of the progressive lens.

7. The spotlight LED module according to claim 6, characterized in that: The beam optimizer comprises a rotating shaft and a plurality of biconvex lenses with different optical parameters which are arranged at intervals along the axial direction of the rotating shaft and are mounted on the rotating shaft. The axial direction of the rotating shaft is parallel to the extending direction of the light.

8. The spotlight LED module according to claim 6 or 7, characterized in that: A connecting tube is arranged between the progressive lens and the beam optimizer, and a peripheral wall of the connecting tube is bent toward the inside.

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