Lens, light-emitting assembly and cosmetic device

Abstract

The application provides a lens, a light-emitting assembly and a cosmetic device, and belongs to the technical field of optical elements, and the lens comprises a base part and a shaping part integrally formed with the base part; the base part has a first end face and a second end face facing away from each other, and the shaping part is protruded on the second end face; the first end face is provided with a recess, and the recess at least partially extends into the shaping part; the inner surface of the recess is configured as a Cartesian oval surface; the outer surface of the shaping part is a continuous free surface; the light of an external light source is incident on the Cartesian oval surface, and after being emitted by the lens, a rectangular light spot can be formed on a target surface. The lens of the application embodiment can reduce the complexity of the free surface, reduce the processing difficulty, and form a rectangular light spot with uniform energy and a clearer boundary.

Description

Technical Field

[0001] This application belongs to the field of optical element technology, and more specifically, relates to a lens, a light-emitting component, and a beauty device. Background Technology

[0002] In the field of phototherapy, lenses, as core optical components, directly affect treatment efficacy and safety due to the shape and energy distribution of their emitted light spots. Currently, lenses used in phototherapy equipment mostly employ rotationally symmetrical spherical or aspherical designs, resulting in circular or elliptical emitted light spots. However, treatment areas such as the face and neck often have irregular contours. Circular light spots can easily cover non-target skin areas, leading to ineffective irradiation or even the risk of burns. If the lenses are cut into rectangles using a light-blocking plate, significant light energy loss occurs, reducing treatment efficiency.

[0003] Related technologies have attempted to use freeform surface lenses for direct shaping, but due to the large divergence angle and wide angular distribution of the incident beam, the freeform surface has to undertake an excessively strong modulation task, resulting in complex surface shape and high processing difficulty. Furthermore, the excessive incident angle of the edge light causes aberrations, resulting in poor uniformity and blurred boundaries of the rectangular light spot. Summary of the Invention

[0004] This application provides a lens that can reduce the complexity of freeform surfaces and the difficulty of processing, and can form a rectangular light spot with uniform energy and clearer boundaries.

[0005] The technical solution adopted in this application embodiment is: to provide a lens, including a base portion and a shaping portion integrally formed with the base portion; The base portion has a first end face and a second end face that are opposite to each other, and the shaping portion protrudes from the second end face; The first end face has a recess, which at least partially extends into the shaping part; the inner surface of the recess is constructed as a Cartesian elliptical surface. The outer surface of the shaping part is a continuous free-form surface; The light from the external light source is incident on the Cartesian elliptical surface and exits through the lens, forming a rectangular light spot on the target surface.

[0006] Furthermore, the ratio of the depth of the recess along the optical axis of the lens to the total height of the lens along the optical axis is 0.2 to 0.5.

[0007] Furthermore, the ratio of the diameter of the opening recessed on the first end face to the side length of the base portion is 0.6 to 0.9.

[0008] Furthermore, the ratio of the height of the shaping part along the optical axis to the height of the base part along the optical axis is 3 to 6.

[0009] Furthermore, the ratio of the maximum projected width of the shaping part on the plane perpendicular to the optical axis to the side length of the base part along the same direction is 0.85 to 1.05.

[0010] Furthermore, the ratio of the maximum sag of the freeform surface in the orthogonal first and second directions is 0.85 to 1.15.

[0011] This application also provides a light-emitting component, including a bracket, a light source, and a lens as described in any of the preceding embodiments; The bracket has a mounting surface, and the mounting surface is provided with a groove; The base of the lens is located on the mounting surface and covers the groove, and the light source is located at the bottom center of the groove with its light-emitting surface facing the Cartesian elliptical surface.

[0012] Furthermore, the groove is frustum-shaped, and the diameter of the groove opening is larger than the diameter of the groove bottom.

[0013] This application embodiment also provides a beauty device, including a housing and a light-emitting component as described above disposed within the housing; The housing has a light-emitting window, and the shaping part of the lens faces the light-emitting window.

[0014] Furthermore, the beauty device is any one of a light radiation hair removal device, a light radiation hair growth device, a light radiation beauty device, and a light radiation therapy device.

[0015] The beneficial effects of the lens provided in this application embodiment are as follows: In the lens of this application embodiment, the concave inner surface of the first end face of the base portion is constructed into a Cartesian elliptical surface, which works in conjunction with the continuous freeform surface of the outer surface of the shaping portion. This allows the light from the external light source to be refracted by the Cartesian elliptical surface to form a virtual light source located between the light source and the shaping portion, effectively compressing the beam divergence angle incident on the freeform surface, thereby significantly reducing the beam modulation burden borne by the freeform surface. Because the incident light angle is more concentrated, the freeform surface only needs weak shaping to achieve rectangular light spot output, avoiding the surface complexity and processing difficulties caused by large-angle incident light in traditional solutions. In addition, because the incident angle of light on the freeform surface is reduced, edge aberrations are suppressed, and the energy uniformity and boundary sharpness of the light spot are improved. Thus, without the need for light blocking while maintaining high light energy utilization, this application embodiment achieves low-complexity, easy-to-process, and stable imaging quality rectangular light spot output, meeting the needs of phototherapy beauty equipment for precise and efficient irradiation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the lens provided in an embodiment of this application; Figure 2 A three-dimensional structural diagram of the lens provided in an embodiment of this application from another angle; Figure 3 A front view of a lens provided in an embodiment of this application; Figure 4 For along Figure 3 Sectional view of AA; Figure 5 The optical path diagram for forming a virtual light source using a Cartesian elliptical surface is provided in the embodiments of this application. Figure 6 An illustration of the rectangular light spot of the lens provided in the embodiments of this application; Figure 7 A cross-sectional view of the XOZ plane of the lens provided in an embodiment of this application; Figure 8 A cross-sectional view of the lens in the YOZ plane provided in an embodiment of this application; Figure 9 A top view of the lens provided in an embodiment of this application; Figure 10 A three-dimensional structural schematic diagram of the light-emitting component provided in the embodiments of this application; Figure 11 A front view of the light-emitting component provided in an embodiment of this application; Figure 12 For along Figure 11 A cross-sectional view of BB.

[0018] The following are the labeling elements in the figure: 1. Lens; 11. Base; 111. First end face; 1111. Recess; 1112. Cartesian elliptic surface; 112. Second end face; 12. Shaping part; 121. Freeform surface; 13. Optical axis; 2. Bracket; 21. Assembly surface; 22. Groove; 3. Light source; 31. Virtual light source; 100. Light-emitting components. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] Please see Figure 1 and Figure 2 The lens 1 provided in this application embodiment will now be described. The lens 1 provided in this application embodiment includes a base portion 11 and a shaping portion 12 integrally formed with the base portion 11. The base portion 11 has a first end face 111 and a second end face 112 facing away from each other, and the shaping portion 12 protrudes from the second end face 112; the first end face 111 has a recess 1111, and the recess 1111 extends at least partially into the shaping portion 12; the inner surface of the recess 1111 is constructed as a Cartesian elliptic surface 1112; the outer surface of the shaping portion 12 is a continuous freeform surface 121, and the freeform surface 121 constitutes the only freeform surface 121 of the lens 1; the light from the external light source 3 is incident through the Cartesian elliptic surface 1112 and, after exiting the lens 1, can form a rectangular light spot on the target surface.

[0024] The lens 1 in this embodiment functions to receive light emitted from an external light source 3, and after internal refraction and shaping, projects a rectangular light spot onto the target surface. The lens 1 can be made of a light-transmitting material, such as optical-grade polycarbonate (PC), polymethyl methacrylate (PMMA), optical glass, or silicone.

[0025] The base portion 11 can be square, circular, or prismatic, and its thickness along the optical axis 13 is less than the height of the shaping portion 12. The base portion 11 has two opposing end faces, namely a first end face 111 and a second end face 112. The first end face 111 faces the external light source 3 and is the incident side of light entering the lens 1; the second end face 112 faces the shaping portion 12 and is the transition surface where light travels through the lens 1 and reaches the shaping portion 12.

[0026] Reference Figure 1 and Figure 2 The shaping part 12 is a protruding structure integrally formed with the base part 11, and there is no interface between them through adhesive bonding, welding, or mechanical assembly. The shaping part 12 is disposed on the second end face 112. The outer contour of the shaping part 12 can be a rotationally symmetric dome shape, ellipsoid shape, square pyramid shape, or an irregular convex body enclosed by a freeform surface 121. The height h2 of the shaping part 12 along the optical axis 13 can be greater than the thickness of the base part 11, and its function is to perform final rectangular modulation on the light rays after pre-shaping by the Cartesian elliptical surface 1112.

[0027] Reference Figure 4 The recess 1111 is an inwardly recessed structure formed on the first end face 111 of the base portion 11. The opening of the recess 1111 faces the external light source 3, and the bottom of the recess 1111 faces the shaping portion 12. The cross-sectional shape of the recess 1111 can be circular, elliptical, or polygonal, and its inner surface forms a concave surface. The recess 1111 has a relatively large depth, and its bottom extends beyond the interface between the base portion 11 and the shaping portion 12, entering the solid area of ​​the shaping portion 12. This design allows light entering from the recess 1111 to reach the outer surface of the shaping portion 12 with a shorter optical path, reducing light energy loss inside the lens 1.

[0028] Reference Figure 4 and Figure 5The Cartesian elliptic surface 1112 is the surface shape of the inner surface of the concave 1111. The Cartesian elliptic surface 1112 is a rotationally symmetric refractive surface designed based on the Cartesian oval principle. Its geometric characteristics are: the region near one focus of the ellipse is taken as the object side, and the region near the other focus is taken as the image side, forming a concave or convex surface through rotationally symmetric elliptical arc segments. In this scheme, the Cartesian elliptic surface 1112 serves as the incident surface, receiving the large-angle diverging beam emitted by the external light source 3, and refracting it to form an equivalent beam with a stronger converging tendency, thus forming the virtual light source 31. The radius of curvature, eccentricity, and sag of the Cartesian elliptic surface 1112 are optimized and determined based on the emission size and emission angle of the light source 3 and the position of the target virtual light source 31.

[0029] Reference Figure 1 and Figure 4 A freeform surface 121 refers to an arbitrary smooth surface that has neither rotational symmetry nor translational symmetry. Its surface shape can be fitted by non-uniform rational B-splines (NURBS), polynomial surfaces, or discrete point clouds. In the embodiments of this application, the freeform surface 121 is continuous, that is, there are no edges, steps, or segmented joints on the entire outer surface of the shaping part 12, and the refraction direction of light on this surface changes continuously with position. The freeform surface 121 constitutes the only exit surface of the lens 1, and all light rays emitted from the lens 1 must pass through this freeform surface 121.

[0030] External light source 3 is a light-emitting device that provides incident light to lens 1. External light source 3 can be an LED chip, a COB light source module, a VCSEL array, a laser diode, or a halogen lamp, etc. The light-emitting surface of external light source 3 faces the recess 1111 of lens 1, and the light emitted by it enters the Cartesian elliptic surface 1112 with a certain divergence angle.

[0031] The target surface is the surface on which the rectangular light spot is ultimately projected, i.e., the surface of the irradiated object. In phototherapy and beauty applications, the target surface can be the surface of human skin. In detection or verification scenarios, the target surface can be a white diffuse reflection screen or an illuminance meter receiving surface located at a specific distance. The distance between the target surface and the freeform surface 121 of lens 1 is the projection distance, which is determined according to the application scenario.

[0032] Reference Figure 6 The rectangular light spot is the illumination distribution area formed by the light rays emitted from lens 1 on the target surface. Its outline is rectangular or approximately rectangular, and the rectangle can be a rectangle or a square. The long and short sides of the rectangular light spot correspond to the modulation directions of the freeform surface 121 in two orthogonal directions, respectively. The sharpness of the rectangular light spot's boundary depends on the control precision of the freeform surface 121 over the edge rays, while the energy uniformity inside the light spot depends on the synergistic shaping effect of the Cartesian elliptic surface 1112 and the freeform surface 121.

[0033] The Cartesian elliptical surface 1112 is the optical surface shape used on the inner surface of the concave 1111. Its shape is designed based on the principle of aberration-free imaging and follows Fermat's principle, meaning that all light rays emitted from the real light source 3 have a constant optical path after refraction through this surface. Specifically, assuming the real light source 3 is located at the origin, the virtual light source 31 is located at coordinate f on the optical axis 13, the refractive index of the lens 1 is n, and the refractive index of air is 1, then any point on the Cartesian elliptical surface 1112 satisfies the optical path equation: ; Where C is a constant optical path. The surface obtained by solving this equation can refract large-angle divergent rays from the real light source 3 into an equivalent beam with a stronger converging tendency, and its backward extension converges at the location of the virtual light source 31. For the subsequent freeform surface 121, the incident light is no longer emitted from the real light-emitting diode, but seems to be emitted from the virtual point light source 3, which is higher in position and smaller in size. This greatly compresses the incident angle distribution when the light reaches the freeform surface 121, avoids the total internal reflection loss caused by large-angle incident, and provides a high-quality input beam for the rectangular shaping of the freeform surface 121. The Cartesian elliptic surface 1112 is used as the incident surface in this lens 1, and its surface shape parameters are determined by solving according to the light emission characteristics of the light source 3 and the required position of the virtual light source 31.

[0034] Reference Figure 1 , Figure 4 and Figure 6 The freeform surface 121 is a continuous optical surface used on the outer surface of the shaping part 12. It does not possess rotational symmetry or translational symmetry, and the surface shape can be constructed using specific methods such as non-uniform rational B-spline surfaces, polynomial surfaces, or discrete point cloud fitting. In this embodiment, the freeform surface 121 is continuous, and the entire outer surface of the shaping part 12 does not contain edges, steps, or segmented joints. The design of the freeform surface 121 is based on the law of conservation of energy, established by defining the luminous intensity distribution of the light source 3. The mapping relationship between the target surface illuminance distribution E(x,y) and the target surface illuminance distribution, i.e. The energy of the incident beam is distributed to the rectangular region of the target surface according to a predetermined rule. Since the pre-stage Cartesian elliptical surface 1112 has already pre-shaped the beam into a converging beam pointing towards the virtual light source 31, the freeform surface 121 only needs to undertake a weaker shaping task to modulate the circular beam cross-section into a rectangular distribution. Its surface shape has independent curvature distribution in two orthogonal directions, so as to achieve asymmetric shaping of the beam.

[0035] Please see Figure 5This diagram illustrates the light-shaping mechanism of lens 1 in this application. The red dot represents a real light source 3 (such as an LED chip), whose diverging light beam (red dashed line) strikes the first end face 111 of lens 1. The blue curved surface is the Cartesian elliptic surface 1112 (incident surface). Crucially, after refraction by the Cartesian elliptic surface 1112, the light does not form a direct image but instead creates a virtual light source 31 (purple dot in the diagram). This virtual light source 31 is located between the real light source 3 and the freeform surface 121 of lens 1. The light beams emitted from the virtual light source 31 (purple dashed line) exhibit a converging or collimating tendency, projecting onto the green freeform surface 121. Since the light appears to originate from the closer virtual light source 31, their incident angle upon reaching the freeform surface 121 is optimized, allowing the freeform surface 121 to more accurately deflect the light to the target angle, forming the edge of a rectangular light spot.

[0036] During operation, the light emitted from the external light source 3 first reaches the recess 1111 of the first end face 111 of the lens 1. After refraction by the Cartesian elliptical surface 1112, the divergence angle of the light is compressed, forming an equivalent beam that converges towards the shaping section 12. The area where the backward extension of this equivalent beam converges is the virtual light source 31, located between the external light source 3 and the shaping section 12. Subsequently, the equivalent beam continues to propagate and reaches the freeform surface 121 on the outer surface of the shaping section 12. Since the Cartesian elliptical surface 1112 has completed most of the angle compression, the freeform surface 121 only needs to undertake a relatively weak shaping task to modulate the light into a rectangular distribution. After refraction by the freeform surface 121, the light exits the lens 1, forming a rectangular light spot on the target surface. Because the shaping burden of the freeform surface 121 is significantly reduced, its surface complexity decreases, the processing difficulty is reduced, and the incident angle of the edge light is also controlled within a reasonable range, reducing aberrations and making the energy distribution of the rectangular light spot more uniform and the boundary clearer. Furthermore, the integral molding structure of the base part 11 and the shaping part 12 eliminates the alignment error of the assembly interface, further ensuring the stability of the light spot quality.

[0037] Please see Figure 6 This demonstrates the effect of the light spot formed on the target surface using lens 1 according to the embodiments of this application. The color cloud map on the left shows the illuminance distribution of the light spot. It can be seen that the light spot generally presents a regular rectangular outline, with higher and relatively uniform illuminance in the central area (red part), and clear boundaries in the edge area (green to blue transition zone), without obvious trailing or stray halo. This proves that the synergistic effect of the Cartesian elliptic surface 1112 and the freeform surface 121 effectively controls the direction of light propagation.

[0038] The curves on the right and below represent the illuminance cross-sections along the Y and X axes, respectively. The curves show that the energy distribution of the light spot in the two orthogonal directions has a distinct "top-hat" characteristic, and drops rapidly at the edges (good raucousness). This distribution characteristic verifies that the freeform surface 121 modulates the light differently in the two orthogonal directions, successfully shaping the circular light source 3 into a rectangular light spot.

[0039] Furthermore, referring to Figure 7 The ratio of the depth h1 of the recess 1111 along the optical axis 13 of the lens 1 to the total height H of the lens 1 along the optical axis 13 is 0.2 to 0.5, for example, 0.25, 0.30, 0.35, 0.40, 0.45 or 0.49.

[0040] The depth h1 of the recess 1111 along the optical axis 13 of the lens 1 refers to the distance from the first end face 111 (i.e., the plane where the opening of the recess 1111 is located) along the optical axis 13 to the apex of the recess 1111. This depth h1 reflects the extent to which the recess 1111 extends into the lens 1. The greater the depth, the closer the bottom of the recess 1111 is to or even beyond the interface between the base portion 11 and the shaping portion 12, and the shorter the path of light propagation from the incident surface to the freeform surface 121 within the base portion 11.

[0041] Reference Figure 7 The total height H of lens 1 along the optical axis 13 refers to the distance along the optical axis 13 from the first end face 111 to the vertex of the outer surface of the shaping part 12 (i.e., the highest point of the freeform surface 121 on the optical axis 13). The total height H is the maximum external dimension of lens 1 in the optical axis 13 direction, which determines the axial space occupied by lens 1 in the light-emitting assembly 100.

[0042] This ratio defines the proportion of the depth h1 of the recess 1111 in the total height H of the lens 1. When the ratio is 0.2, the depth h1 of the recess 1111 is approximately one-third of the total height, and the bottom of the recess 1111 is still within the base portion 11. When the ratio reaches 0.5, the bottom of the recess 1111 extends significantly into the shaping portion 12. If the ratio is less than 0.2, the recess 1111 is too shallow, the effective aperture of the Cartesian elliptical surface 1112 is limited, the pre-shaping capability for light is insufficient, and the freeform surface 121 still has to bear a large shaping burden. If the ratio is greater than 0.5, the recess 1111 is too deep, the structural strength of the base portion 11 decreases, and the lens 1 is prone to deformation due to stress during assembly. At the same time, the bottom of the recess 1111 is too close to the freeform surface 121, resulting in an excessively thin wall thickness of the lens 1 between the Cartesian elliptical surface 1112 and the freeform surface 121, affecting optical uniformity and mechanical reliability.

[0043] In some embodiments, the depth h1 of the recess 1111 along the optical axis 13 of the lens 1 is 1.3 mm, and the total height H of the lens 1 along the optical axis 13 is 4.2 mm. Then the ratio of the depth h1 of the recess 1111 along the optical axis 13 of the lens 1 to the total height H of the lens 1 along the optical axis 13 is 0.31.

[0044] In some embodiments, the depth h1 of the recess 1111 along the optical axis 13 of the lens 1 is 1.6 mm, and the total height H of the lens 1 along the optical axis 13 is 4.5 mm. Then the ratio of the depth h1 of the recess 1111 along the optical axis 13 of the lens 1 to the total height H of the lens 1 along the optical axis 13 is 0.36.

[0045] In some embodiments, the depth h1 of the recess 1111 along the optical axis 13 of the lens 1 is 1.0 mm, and the total height H of the lens 1 along the optical axis 13 is 3.5 mm. Then the ratio of the depth h1 of the recess 1111 along the optical axis 13 of the lens 1 to the total height H of the lens 1 along the optical axis 13 is 0.29.

[0046] During operation, the depth h1 of the recess 1111 within this ratio range ensures that the Cartesian elliptical surface 1112 has sufficient sag to effectively refract large-angle incident light, while maintaining sufficient wall thickness in the base portion 11 to withstand assembly stress. After refraction by the Cartesian elliptical surface 1112, the light propagates towards the shaping portion 12 at a relatively concentrated angle inside the lens 1, effectively compressing the beam divergence angle received by the freeform surface 121. This ratio, in conjunction with the structure where the recess 1111 at least partially extends into the shaping portion 12, ensures that the position of the virtual light source 31 is within a reasonable range, thereby achieving a balance between uniformity and boundary sharpness in the final rectangular light spot.

[0047] Furthermore, referring to Figure 2 and Figure 7 The ratio of the opening diameter d of the recess 1111 on the first end face 111 to the side length L of the base portion 11 is 0.6 to 0.9, for example, 0.7, 0.75, 0.8 or 0.85.

[0048] The opening diameter d of the recess 1111 on the first end face 111 refers to the projected size of the opening of the recess 1111 on the plane containing the first end face 111. When the opening of the recess 1111 is circular, this size is the diameter of the circle; when the opening of the recess 1111 is elliptical, it can be the major axis diameter or the equivalent circle diameter; when the opening of the recess 1111 is polygonal, it can be the incircle diameter or the circumcircle diameter. The opening diameter d determines the effective light-passing aperture of the lens 1 that the light emitted by the external light source 3 can enter.

[0049] Reference Figure 7The side length L of the base portion 11 refers to the lateral dimension of the base portion 11 in the direction perpendicular to the optical axis 13. When the base portion 11 is a square plate, the side length is the length of one side; when the base portion 11 is a circular plate, the side length can be understood as its diameter; when the base portion 11 is a rectangular plate, the longer or shorter side can be used as a reference, and the side length in the direction corresponding to the opening diameter d of the recess 1111 can be taken.

[0050] This ratio defines the proportion of the opening in the recess 1111 in the lateral dimension of the base portion 11. When the ratio is 0.6, the opening in the recess 1111 is small, and the base portion 11 has a wider annular or square border, which can be used for assembly and positioning with the bracket 2. When the ratio is 0.9, the opening in the recess 1111 is large, and the base portion 11 only retains a narrow border. If the ratio is less than 0.6, the light-transmitting aperture is insufficient, some light is blocked by the base portion 11, and the light energy utilization rate decreases. If the ratio is greater than 0.9, the edge of the base portion 11 is too narrow, the assembly contact area between the lens 1 and the bracket 2 is insufficient, the fixing reliability is reduced, and the lens 1 is prone to displacement due to insufficient edge constraint when it expands due to heat.

[0051] In some embodiments, the opening diameter d of the recess 1111 on the first end face 111 is 3.74 mm, the side length L of the base portion 11 is 5.0 mm, and the ratio of the two is 0.748.

[0052] In some embodiments, the opening diameter d of the recess 1111 on the first end face 111 is 4.0 mm, the side length L of the base portion 11 is 5.0 mm, and the ratio of the two is 0.80.

[0053] In some embodiments, the opening diameter d of the recess 1111 on the first end face 111 is 3.0 mm, the side length L of the base portion 11 is 4.5 mm, and the ratio of the two is 0.67.

[0054] During operation, the aperture diameter d within this ratio range ensures that most of the light emitted from the external light source 3 can enter the recess 1111 and be received by the Cartesian elliptical surface 1112, avoiding light loss due to shading at the edge of the base portion 11. Simultaneously, the sufficient width reserved at the edge of the base portion 11 provides a reliable support area for the positioning and fixation of the lens 1 on the mounting surface 21 of the support 2. The aperture diameter d matches the curvature design of the Cartesian elliptical surface 1112, resulting in a reasonable incident angle distribution of the light entering the recess 1111 on the elliptical surface. This ensures a stable position for the virtual light source 31 formed after refraction, providing excellent input beam conditions for the subsequent rectangular shaping of the freeform surface 121.

[0055] Furthermore, referring to Figure 7The ratio of the height h2 of the shaping part 12 along the optical axis 13 to the height h3 of the base part 11 along the optical axis 13 is 3 to 6, for example, 3.5, 4.0, 4.5, 5.0 or 5.5.

[0056] The height h2 of the shaping section 12 along the optical axis 13 refers to the distance along the optical axis 13 from the second end face 112 (i.e., the interface between the shaping section 12 and the base section 11) to the vertex of the outer surface of the shaping section 12. This height reflects the degree of protrusion of the shaping section 12 along the optical axis 13 and determines the range of changes in the sagitta and curvature of the freeform surface 121. The larger the height h2 of the shaping section 12, the more ample the longitudinal modulation space of the freeform surface 121, but the total height of the lens 1 also increases accordingly.

[0057] The height h3 of the base portion 11 along the optical axis 13, i.e. the thickness of the base portion 11 in the optical axis 13 direction, is the distance between the first end face 111 and the second end face 112. The height h3 of the base portion 11 determines the usable depth range of the Cartesian elliptic surface 1112 and the propagation distance of light within the base portion 11.

[0058] This ratio defines the height ratio of the shaping part 12 relative to the base part 11 along the optical axis 13. When the ratio is 3, the height h2 of the shaping part 12 is approximately twice the height h3 of the base part 11, and the lens 1 is relatively flat, suitable for scenarios with strict limitations on installation height. When the ratio is 6, the height h2 of the shaping part 12 is 6 times the height h3 of the base part 11, and the lens 1 is relatively tall, giving the freeform surface 121 greater modulation freedom. If the ratio is less than 3, the shaping part 12 is too flat, the sagitta of the freeform surface 121 is insufficient, making it difficult to achieve effective rectangular shaping, and the edge of the light spot is prone to trailing. If the ratio is greater than 6, the lens 1 is too slender, the structural rigidity decreases, and it is prone to breakage under vibration or impact. At the same time, an excessively large height h2 of the shaping part 12 will increase the material usage and weight of the lens 1.

[0059] In some embodiments, the height h2 of the shaping part 12 along the optical axis 13 is 3.43 mm, and the height h3 of the base part 11 along the optical axis 13 is 0.77 mm, with a ratio of 4.45.

[0060] In some embodiments, the height h2 of the shaping part 12 along the optical axis 13 is 4.0 mm, and the height h3 of the base part 11 along the optical axis 13 is 1.0 mm, with a ratio of 4.0.

[0061] In some embodiments, the height h2 of the shaping part 12 along the optical axis 13 is 3.0 mm, and the height h3 of the base part 11 along the optical axis 13 is 0.8 mm, with a ratio of 3.75.

[0062] During operation, the height h2 of the shaping section 12 within this ratio range provides sufficient longitudinal space for the freeform surface 121, enabling it to deflect light rays to different degrees in two orthogonal directions, thereby shaping a circular or elliptical beam cross-section into a rectangle. Simultaneously, the base section 11 maintains an appropriate thickness, ensuring that the Cartesian elliptical surface 1112 has sufficient curvature depth to complete the pre-shaping of the light rays. The height ratio between the shaping section 12 and the base section 11 also affects the center of gravity position and assembly stability of the lens 1; a reasonable ratio helps reduce the risk of the lens 1 tipping over on the support 2.

[0063] Furthermore, referring to Figure 9 The ratio of the maximum projected width w of the shaping part 12 on the plane perpendicular to the optical axis 13 to the side length L of the base part 11 along the same direction is 0.85 to 1.05, for example 0.88, 0.90, 0.95, 0.98, 1.00 or 1.02.

[0064] The maximum projection width w of the shaping part 12 on a plane perpendicular to the optical axis 13 refers to the maximum dimension of the projected profile in a certain direction when the shaping part 12 is projected along the optical axis 13 onto a plane perpendicular to the optical axis 13. When the freeform surface 121 of the shaping part 12 is rotationally symmetric, the projection is circular, and the maximum projection width w is the diameter of the circle; when the freeform surface 121 is not rotationally symmetric, the projection may be elliptical or irregular in shape, and the maximum projection width w is taken as the longest chord of the projected profile.

[0065] The side length L of the base portion 11 along the same direction refers to the lateral dimension of the base portion 11 in the aforementioned projection direction. If the base portion 11 is square, then the side length L is the side length of the square in that direction; if the base portion 11 is circular, then it is the diameter in that direction.

[0066] This ratio defines the extent to which the shaping portion 12 covers the base portion 11 in the lateral direction. When the ratio is 0.85, the maximum projected width w of the shaping portion 12 is slightly smaller than the side length L of the base portion 11, leaving a small margin between the edge of the shaping portion 12 and the edge of the base portion 11. When the ratio is 1.05, the maximum projected width w of the shaping portion 12 is equal to the side length L of the base portion 11, and the two are flush in the lateral direction. If the ratio is less than 0.85, the shaping portion 12 is too small relative to the base portion 11, the effective area of ​​the freeform surface 121 is limited, and the aperture of the emitted beam is insufficient. If the ratio is greater than 1.05, the shaping portion 12 extends beyond the base portion 11 in the lateral direction, forming a cantilever structure, which not only affects the appearance but also makes the edge of the shaping portion 12 lack the support of the base portion 11, making it prone to breakage under lateral forces.

[0067] In some embodiments, refer to Figure 9The maximum projected width w of the shaping part 12 in the direction perpendicular to the optical axis 13 is 4.91 mm, and the side length L of the base part 11 in the same direction is 5 mm, with a ratio of 0.982.

[0068] In some embodiments, the maximum projected width w of the shaping portion 12 in the direction perpendicular to the optical axis 13 is 4.5 mm, and the side length L of the base portion 11 in the same direction is 5.0 mm, with a ratio of 0.90 between the two.

[0069] In some embodiments, the maximum projected width w of the shaping portion 12 in the direction perpendicular to the optical axis 13 is 4.2 mm, and the side length L of the base portion 11 in the same direction is 4.5 mm, with a ratio of 0.93 between the two.

[0070] During operation, this ratio range allows the shaping part 12 to almost completely cover the upper surface of the base part 11, giving the freeform surface 121 the largest possible effective area to modulate the light, ensuring that the size and uniformity of the rectangular light spot meet the requirements. Simultaneously, the edge of the shaping part 12 does not extend beyond or is only slightly aligned with the edge of the base part 11, ensuring the structural stability and neat appearance of the lens 1 during assembly. This ratio, in conjunction with the height ratio mentioned earlier (the ratio of the height h2 of the shaping part 12 along the optical axis 13 to the height h3 of the base part 11 along the optical axis 13), jointly determines the overall aspect ratio of the shaping part 12, influencing the surface design space of the freeform surface 121.

[0071] Furthermore, participants Figure 7 and Figure 8 The ratio of the maximum sag of the freeform surface 121 in the orthogonal first direction X and second direction Y is 0.85 to 1.15, for example, 0.88, 0.9, 0.95, 1.0, 1.05 or 1.10.

[0072] The maximum sag of the freeform surface 121 in the orthogonal first direction X and second direction Y refers to the maximum vertical distance from each contour point of the freeform surface 121 to the reference plane (XOY), taken on two mutually perpendicular cross-sectional directions, with the plane perpendicular to the optical axis 13 and passing through the vertex O of the freeform surface 121 as the reference plane. The first direction X and the second direction Y can be any two orthogonal directions, usually chosen to correspond to the long and short sides of the rectangular light spot, respectively.

[0073] When the freeform surface 121 is rotationally symmetric, the maximum sagitta in the two directions is equal, and the ratio is 1; when the freeform surface 121 is not rotationally symmetric, the maximum sagitta in the two directions is different, and the ratio deviates from 1.

[0074] This ratio defines the degree of difference in bending depth of the freeform surface 121 in two orthogonal directions. When the ratio is 0.85, the freeform surface 121 exhibits obvious asymmetry; when the ratio is 1.15, the differences are in opposite directions but with the same magnitude; when the ratio is 1.0, the maximum sag of the freeform surface 121 in both directions is equal, approaching rotational symmetry. If the ratio is less than 0.85 or greater than 1.15, the difference in sag in the two directions is too large, and the modulation capability of the freeform surface 121 in one direction is much stronger than in the other, resulting in a significant difference in the uniformity of the rectangular spot in the two directions, and the spot shape deviates from a rectangle and tends to be elliptical.

[0075] In some embodiments, the reference Figure 7 and Figure 8 The maximum sagitta S1 of the freeform surface 121 in the orthogonal first direction X and the maximum sagitta S2 in the second direction Y are both 2.82 mm, and the ratio between the two is 1.

[0076] In some embodiments, the maximum sagitta S1 of the freeform surface 121 in the orthogonal first direction X is 2.6 mm, and the maximum sagitta S2 in the second direction Y is 2.4 mm, with a ratio of 1.08.

[0077] In some embodiments, the maximum sagitta S1 of the freeform surface 121 in the orthogonal first direction X is 2.2 mm, and the maximum sagitta S2 in the second direction Y is 2.5 mm, with a ratio of 0.88.

[0078] During operation, this ratio range ensures that the modulation capability of the freeform surface 121 on the light beam is basically balanced in the two orthogonal directions. Since the Cartesian elliptical surface 1112 has already pre-compressed the light beam angle, the freeform surface 121 only needs to apply moderate deflection in each of the two directions to shape the beam cross-section from a circle to a rectangle. The moderate difference in sag in the two directions (the ratio is between 0.85 and 1.15) corresponds precisely to the required ratio of the long side to the short side of the rectangular light spot, resulting in a smooth transition of illuminance at the four corners of the rectangular light spot formed on the target surface, clear boundaries, and uniformity in both the long and short sides that meets the irradiation requirements for phototherapy.

[0079] Reference Figure 10 , Figure 11 and Figure 12 This application also provides a light-emitting component 100, including a bracket 2, a light source 3, and a lens 1 as described in any of the above embodiments; the bracket 2 has a mounting surface 21, and the mounting surface 21 is provided with a groove 22; the base portion 11 of the lens 1 is disposed on the mounting surface 21 and covers the groove 22, and the light source 3 is disposed at the bottom center of the groove 22 with its light-emitting surface facing the Cartesian elliptic surface 1112.

[0080] The light-emitting component 100 is an optical module that integrates the lens 1, the light source 3, and the support 2 into a single functional unit. It is used to install in beauty devices or other phototherapy equipment to achieve uniform light spot output of a specific shape. As a whole, the light-emitting component 100 facilitates modular assembly and replacement within the device.

[0081] The bracket 2 can be plate-shaped, frame-shaped, or shell-shaped, and its material can be aluminum alloy, stainless steel, engineering plastics (such as PA66, PBT), or thermally conductive ceramics. The bracket 2 is provided with a mounting surface 21, which is a plane or near-plane on the bracket 2 for mounting the lens 1. Its surface can be provided with positioning pin holes, threaded holes, or snap-fit ​​structures for fixing the base part 11 of the lens 1.

[0082] The groove 22 on the mounting surface 21 is a recessed space 1111 created on the bracket 2 to accommodate the light source 3 and its driving circuitry. The shape of the groove 22 can be circular, square, or polygonal, and its depth is determined according to the package height of the light source 3 and heat dissipation requirements. The sidewalls of the groove 22 can be vertical, inclined, or stepped. A mounting position for the light source 3 is provided at the center of the bottom of the groove 22, where the light source 3 is fixed by welding, bonding, or screws.

[0083] Light source 3 can be a single high-power LED chip, a COB (Chip on Board) LED module, a VCSEL (Vertical Cavity Surface Emitting Laser) array, a laser diode module, or an OLED panel, etc. The light-emitting surface of light source 3 faces the Cartesian elliptical surface 1112 of lens 1, that is, the light emitted by light source 3 is directed towards the recess 1111 along the optical axis 13. The emission wavelength of light source 3 is selected according to the specific needs of phototherapy, such as 630nm red light, 850nm near-infrared light, or 415nm blue light, etc.

[0084] Lens 1 is the lens 1 described in any of the preceding embodiments, with its base 11 mounted on the mounting surface 21 of the bracket 2, covering the opening of the groove 22. The lens 1 and the bracket 2 can be fixed by snap-fit ​​connection, screw connection, adhesive bonding, or ultrasonic welding, etc. After the lens 1 covers the groove 22, the light source 3 is enclosed in the space between the groove 22 and the recess 1111, and light can only enter the lens 1 from the Cartesian elliptical surface 1112.

[0085] During operation, the light source 3 emits light after being powered on. The light is emitted upward from the bottom of the groove 22, passes through the internal space of the groove 22, and reaches the recess 1111 of the first end face 111 of the lens 1. Since the light source 3 is located at the center of the bottom of the groove 22, the normal direction of its light-emitting surface is basically coincident with the optical axis 13 of the lens 1. The light is incident on the Cartesian elliptical surface 1112 with a symmetrical angle distribution. The Cartesian elliptical surface 1112 refracts the large-angle divergent light into an equivalent beam with a stronger converging tendency. This beam continues to propagate to the freeform surface 121 of the shaping part 12, and after being modulated by the freeform surface 121, it exits the lens 1, forming a rectangular light spot on the target surface. The presence of the groove 22 provides the installation space and heat dissipation channel for the light source 3. At the same time, the sidewall of the groove 22 plays a certain role in blocking stray light, reducing the amount of ineffective light entering the lens 1. The fit between the mounting surface 21 of the bracket 2 and the base part 11 of the lens 1 ensures the accurate positioning of the optical axis 13, avoiding light spot offset or shape distortion caused by assembly deviation.

[0086] In some embodiments, refer to Figure 12 The groove 22 is frustum-shaped, and the diameter of the groove opening of the groove 22 is larger than the diameter of the groove bottom.

[0087] The term "frustum-shaped" refers to the fact that the three-dimensional shape of the groove 22 is a truncated cone, meaning it is the portion remaining after the top of a cone is removed by a plane parallel to the base. The diameter of the groove opening (i.e., the open end) of the frustum-shaped groove 22 is larger than the diameter of the groove bottom (i.e., the bottom), and the sidewalls gradually slope outward from the groove bottom towards the groove opening. The groove opening of the groove 22 is located on the mounting surface 21 of the bracket 2, and the groove bottom is located inside the bracket 2. The diameter of the groove opening can match or be slightly larger than the opening diameter d of the recess 1111 of the lens 1 to ensure that light can enter the recess 1111 from the groove 22 without obstruction. The diameter of the groove bottom is determined according to the packaging size of the light source 3, and must accommodate the light-emitting surface and fixing structure of the light source 3.

[0088] The inclination angle of the sidewall of the groove 22 (i.e., the semi-cone angle of the frustum) can be designed according to the emission angle of the light source 3. When the emission angle of the light source 3 is large, the inclination angle of the sidewall is increased accordingly to avoid the sidewall blocking the edge light. The surface of the sidewall can be polished to enhance reflection or blackened to absorb stray light, depending on the optical design requirements. The frustum-shaped groove 22 can be processed by milling, die casting, or injection molding.

[0089] During operation, the gradually expanding structure of the frustum-shaped groove 22 ensures that large-angle light emitted from the light source 3 is not blocked by the sidewalls as it propagates from the bottom to the opening of the groove, thereby improving the efficiency of light entering the recess 1111 of the lens 1. The design that the diameter of the opening is larger than the diameter of the bottom ensures that even if the light source 3 has a certain luminous area, the large-angle light emitted from its edge can still reach the Cartesian elliptic surface 1112 smoothly. At the same time, the frustum-shaped sidewalls guide the direction of light propagation, making the light more concentrated towards the central area of ​​the recess 1111, which helps to improve the pre-shaping effect of the Cartesian elliptic surface 1112. In addition, the gradually expanding structure of the frustum-shaped groove 22 is easier to demold than a straight-walled circular hole in machining, which helps to reduce the manufacturing cost of the bracket 2.

[0090] The light-emitting component 100 of this application embodiment, since it includes the lens 1 in any of the above embodiments, has the beneficial effects brought by the lens 1 in any of the above embodiments, which will not be repeated here. This application also provides a beauty device, including a housing and a light-emitting component 100 as described in the above embodiments disposed in the housing; the housing has a light-emitting window, and the shaping portion 12 of the lens 1 faces the light-emitting window.

[0091] A beauty device is an electronic device that uses light radiation to treat or beautify the skin. The overall shape of a beauty device can be handheld, stick-shaped, panel-type, or helmet-shaped. The device includes a housing, which is the external enclosing structure used to house and protect the internal light-emitting components 100, driving circuitry, heat dissipation structure, and control unit. The housing can be made of materials such as ABS plastic, PC plastic, aluminum alloy, or stainless steel, and its outer surface can be treated with spraying, electroplating, or coating.

[0092] The light-emitting window is a light-transmitting area on the housing, used to guide the light generated by the light-emitting component 100 to the outside. The shape of the light-emitting window can be rectangular or rounded rectangle, matching the shape of the rectangular light spot emitted from the lens 1. A light-transmitting protective plate can be installed at the light-emitting window. This protective plate can be tempered glass, PMMA board, or PC board, etc., and its function is to prevent dust and moisture from entering the housing without significantly affecting the light transmittance. The area of ​​the light-emitting window should be greater than or equal to the projected area of ​​the rectangular light spot to avoid the light spot being truncated by the window edge.

[0093] The housing has an internal mounting cavity, and the light-emitting component 100 is fixed in the mounting cavity by screws, clips, or adhesive. The lens 1 shaping part 12 of the light-emitting component 100 faces the light-emitting window, that is, the convex surface of the freeform surface 121 faces the outside of the housing. After the light is emitted from the freeform surface 121, it is directly projected to the outside through the light-emitting window. The distance between the light-emitting component 100 and the light-emitting window is determined according to the projection distance and size requirements of the rectangular light spot.

[0094] During operation, after the beauty device is powered on, the light source 3 in the light-emitting component 100 emits light. The light is refracted sequentially by the Cartesian elliptical surface 1112 and shaped by the freeform surface 121 before exiting through the lens 1, passing through the light-emitting window, and illuminating the user's skin surface, forming a rectangular light spot. The shape of the rectangular light spot matches the rectangular outline of the light-emitting window, ensuring that the irradiation area matches the treatment area and reducing ineffective irradiation. The drive circuit inside the housing controls the power and irradiation time of the light source 3, and the heat dissipation structure (such as an aluminum heat sink or fan) conducts the heat generated by the light source 3 to the outside of the housing, ensuring that the light-emitting component 100 operates within a safe temperature range. The mounting method of the shaping part 12 facing the light-emitting window ensures that there are no other optical elements obstructing the light from the lens 1 to the light-emitting window, minimizing light energy loss.

[0095] Specifically, the beauty device is any one of a light radiation hair removal device, a light radiation hair growth device, a light radiation beauty device, and a light radiation therapy device.

[0096] Photorejuvenation hair removal devices utilize intense pulsed light or lasers of specific wavelengths to irradiate the skin. This causes the melanin in the hair follicles to absorb the light energy, generating a thermal effect that destroys the follicles and inhibits hair growth. Photorejuvenation hair removal devices typically use a light source (3) in the 600nm to 1100nm wavelength range. A rectangular spot emitted from a lens (1) covers the area of ​​skin requiring hair removal, such as the underarms, arms, or legs. The uniformity of the rectangular spot ensures even heating of the hair follicles, preventing localized overheating and skin burns.

[0097] The phototherapy hair regrowth device uses low-energy laser or LED light to irradiate the scalp, stimulating hair follicle cell activity, promoting blood circulation, and improving hair loss symptoms. The device uses red light at approximately 650nm or near-infrared light at 850nm, with a rectangular light spot emitted from lens 1 covering the target area of ​​the scalp. The shape of the rectangular light spot matches the treatment area of ​​the scalp, improving irradiation efficiency.

[0098] A light radiation beauty device uses specific wavelengths of light to irradiate the facial or body skin to achieve beauty effects such as skin rejuvenation, blemish removal, acne treatment, or promoting collagen production. Light radiation beauty devices can use various wavelengths of LED light sources, such as 415nm blue light for acne treatment, 630nm red light for skin rejuvenation, and 850nm near-infrared light for deep repair. The rectangular light spot emitted from the lens matches the rectangular approximate area of ​​the facial contour, reducing accidental irradiation of sensitive areas such as the eye area.

[0099] Phototherapy devices are medical equipment that use light radiation to treat skin lesions or tissue damage, such as for treating psoriasis, vitiligo, eczema, or for wound healing. The wavelength and power of the light source in a phototherapy device are determined according to treatment needs. The rectangular light spot emitted from the lens covers the affected area, and the uniform energy distribution ensures consistent treatment results.

[0100] All four cosmetic devices described above utilize the light-emitting component 100 and housing structure, as described above. Their core optical principle is the same: rectangular light spot output is achieved through the synergistic effect of the Cartesian elliptical surface 1112 and the freeform surface 121. The differences lie in the wavelength, power, irradiation time of the light source 3, and the external dimensions of the housing, which are adjusted according to specific application scenarios. The uniformity and boundary clarity of the rectangular light spot are crucial for all four devices. This ensures precise coverage of the treatment area and uniform energy application, avoiding localized over- or under-irradiation caused by uneven light spot distribution, thereby improving treatment efficacy and safety.

[0101] The beauty device of this application embodiment includes the light-emitting component 100 in any of the above embodiments, and therefore has the beneficial effects brought by the light-emitting component 100 in any of the above embodiments, which will not be repeated here.

[0102] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lens characterized by, It includes a base portion and a shaping portion integrally formed with the base portion; The base portion has a first end face and a second end face that are opposite to each other, and the shaping portion protrudes from the second end face; The first end face has a recess, and the recess extends at least partially into the shaping portion; The inner surface of the recess is constructed as a Cartesian elliptic surface; The outer surface of the shaping part is a continuous free-form surface; The light from the external light source is incident on the Cartesian elliptical surface and exits through the lens, forming a rectangular light spot on the target surface.

2. The lens of claim 1, wherein The ratio of the depth of the recess along the optical axis of the lens to the total height of the lens along the optical axis is 0.2 to 0.

5.

3. The lens of claim 1, wherein The ratio of the diameter of the opening recessed on the first end face to the side length of the base portion is 0.6 to 0.

9.

4. The lens of claim 1, wherein The ratio of the height of the shaping part along the optical axis to the height of the base part along the optical axis is 3 to 6.

5. The lens of claim 1, wherein The ratio of the maximum projected width of the shaping part on the plane perpendicular to the optical axis to the side length of the base part along the same direction is 0.85 to 1.

05.

6. The lens of claim 1, wherein The ratio of the maximum sag of the freeform surface in the orthogonal first and second directions is 0.85 to 1.

15.

7. A light emitting assembly characterized in that, Includes a support, a light source, and a lens as described in any one of claims 1 to 6; The bracket has a mounting surface, and the mounting surface is provided with a groove; The base of the lens is located on the mounting surface and covers the groove, and the light source is located at the bottom center of the groove with its light-emitting surface facing the Cartesian elliptical surface.

8. The light-emitting component according to claim 7, characterized in that, The groove is truncated cone-shaped, and the diameter of the groove opening is larger than the diameter of the groove bottom.

9. A beauty device, characterized in that, Includes a housing and a light-emitting component as described in claim 7 or 8 disposed within the housing; The housing has a light-emitting window, and the shaping part of the lens faces the light-emitting window.

10. The beauty device according to claim 9, characterized in that, The beauty device is any one of the following: a light radiation hair removal device, a light radiation hair growth device, a light radiation beauty device, and a light radiation therapy device.

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