Condenser lens, lamp and condenser lens module
By designing a focusing lens that includes an incident part, a converging part, and an exiting part, the problems of color layering and uneven light mixing in multi-color LED panel lamps are solved, achieving uniformity of light spot color and illuminance, and reducing production complexity and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- APUTURE IMAGING IND CO LTD
- Filing Date
- 2026-05-09
- Publication Date
- 2026-06-05
AI Technical Summary
Traditional multi-color LED panel lights require custom-made independent lenses for LED light sources with different spectra, which leads to complex production and high costs, as well as problems such as layering of light spot colors and uneven light mixing.
Design a focusing lens that includes an incident part, a converging part, and an exiting part along the optical axis. By refraction in the incident part, total internal reflection in the converging part, and homogenization of light in the exiting part, the angle difference of beams of different wavelengths is less than ±3°. A single lens mold is used.
It achieves uniform mixing of multi-color light sources, reduces manufacturing costs, and ensures uniformity of light spot color and illuminance, making it suitable for use in photographic lighting fill lights.
Smart Images
Figure CN122148926A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical technology, and more specifically, to a condenser lens, a lamp, and a condenser lens module. Background Technology
[0002] In traditional multi-color LED panel lighting fixtures, different spectral LED light sources require custom-made independent lenses, such as Fresnel lenses, convex lenses, and total internal reflection lenses. Because the focal lengths of these lenses differ for different wavelengths of light, the emission angles vary, preventing the different colored light spots from being effectively superimposed on the receiving screen, resulting in color layering and uneven light mixing. Related technologies use different focusing lenses for LED light sources of different spectral bands to minimize differences in their emission angles, allowing for better flattening and superimposition on the receiving screen to achieve uniform lighting. However, multi-color lighting fixtures require the development of multiple sets of focusing lens molds, making production complex and costly. Summary of the Invention
[0003] The purpose of this application is to provide a condenser lens, a lamp, and a condenser lens module, which can enable light sources of different spectra to produce light beams with small differences in the exit angle after passing through the same condenser lens, solve the problem of color layering of light spots when mixing multi-color light sources, achieve uniform light mixing, and only require the development of one condenser lens mold, thereby reducing manufacturing costs.
[0004] In a first aspect, this application provides a focusing lens, which includes, along the optical axis, a following portion: an incident portion for receiving and refracting light from a light source; a converging portion for converging the light refracted by the incident portion through total internal reflection; and an exiting portion for homogenizing and exiting the light converged by the converging portion; wherein the focusing lens is configured such that the difference in beam angle after exiting incident light of different wavelengths is less than ±3°.
[0005] In one possible implementation, the incident portion includes a first bottom surface and a first side surface that enclose and form a cavity. The first bottom surface is disposed opposite to the light-emitting surface of the light source, and the first side surface is gradually tapered along the optical axis. The light emitted by the light source is refracted by the first bottom surface and the first side surface and then enters the converging portion.
[0006] In one possible implementation, the first bottom surface is formed by rotating a first profile curve about an optical axis, and the equation of the first profile curve is: Y1 = 0.0181 × D × X13 - 0.1945 × D × X12 - 0.0121 × D × X1 - 0.2724, where X1 ranges from [0, x1], x1 is the width of the first profile curve along the radial direction of the condenser lens, and x1 = (1.239 ± 0.08) × D, where D is the radius of the light-emitting surface of the light source.
[0007] In one possible implementation, the outer peripheral surface of the converging portion includes a total reflection surface, which is formed by rotating a second profile curve about the optical axis. The equation of the second profile curve is: Y2 = 0.0952 × D × X23 + 0.0249 × D × X22 - 0.6840 × D × X2 - 0.0124, where X2 ranges from [0, x2], x2 is the width of the second profile curve along the radial direction of the condenser lens, and x2 = (2.559 ± 0.1) × D, where D is the radius of the light-emitting surface of the light source.
[0008] In one possible implementation, the emission portion includes a second bottom surface and a second side surface that enclose and form a cavity. The second bottom surface is the light-emitting surface, and the second side surface includes a plurality of steps that gradually expand outward along the optical axis.
[0009] In one possible implementation, the second bottom surface is formed by rotating a third profile curve about the optical axis, and the equation of the third profile curve is: Y3 = -0.0387×D×X33 + 0.0407×D×X32 - 0.0353×D×X3 + 0.7869, where X3 ranges from [0, x3], x3 is the width of the third contour curve along the radial direction of the condenser lens, and x3 = (3 ± 0.1) × D, where D is the radius of the light-emitting surface of the light source.
[0010] In one possible implementation, the plurality of steps include a first step, a second step, and a third step that gradually expand outward along the optical axis. The lengths of the first step, the second step, and the third step along the optical axis are h1, h2, and h3, respectively, and the widths of the first step, the second step, and the third step along the direction perpendicular to the optical axis are m1, m2, and m3, respectively, and satisfy the following condition: h1=(0.259±0.08) ×D, h2=(0.199±0.08) ×D, h3=(0.409±0.05) ×D; m1=(0.411±0.08)×D, m2=(0.557±0.08)×D, m3=(0.532±0.08)×D, where D is the radius of the light-emitting surface of the light source.
[0011] In one possible implementation, an optical microstructure is provided on the second bottom surface; and / or, optical microstructures are provided on a plurality of steps on the second side surface.
[0012] In one possible implementation, the minimum thickness between the first bottom surface and the second bottom surface is t, and t = (5.189 ± 0.1) × D, where D is the radius of the light-emitting surface of the light source.
[0013] Secondly, this application provides a lighting fixture, including a light source and a focusing lens of this application, wherein the light source is disposed at the incident portion of the focusing lens, and the light emitting surface of the light source is disposed facing the converging portion of the focusing lens.
[0014] Thirdly, this application provides a condensing lens module, including a plurality of condensing lenses of this application, which are arranged in an array and connected as a whole.
[0015] According to the condensing lens, lamp and condensing lens module provided in this application, by setting the condensing lens along the optical axis as an incident part, a converging part and an exiting part in sequence, the incident part is used to receive and refract light from the light source, the converging part is used to perform total internal reflection and converge the light after refraction by the incident part, and the exiting part is used to homogenize and emit the light after convergence by the converging part, so that no matter whether the light source is white light or monochromatic light of a specific wavelength, the beam angle difference after passing through the condensing lens is less than ±3°, thereby effectively solving the problem of light spot color layering when mixing multi-color light sources, realizing uniform light mixing, and only one condensing lens mold needs to be developed, reducing the manufacturing cost. 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 schematic diagram of the structure of the condenser lens provided in an embodiment of this application; Figure 2 for Figure 1 The cross-sectional view of the condenser lens along any plane containing the optical axis is shown. Figure 3 for Figure 2 A schematic diagram of the geometric parameters of the condenser lens is shown. Figure 4 This is a schematic diagram of the structure of the lamp provided in the embodiment of this application; Figure 5 A schematic diagram of the light spot displayed on the receiving screen when the lamp provided in the embodiment of this application is equipped with a white light source; Figure 6 for Figure 5 The light distribution curve of the white light source shown; Figure 7 A schematic diagram of the light spot displayed on the receiving screen when the lamp provided in the embodiment of this application is equipped with a monochromatic red light source; Figure 8A schematic diagram of the light spot displayed on the receiving screen when the lamp provided in the embodiment of this application is equipped with a monochromatic blue light source; Figure 9 A schematic diagram of the light spot displayed on the receiving screen when the lamp provided in the embodiment of this application is equipped with a monochromatic green light source.
[0018] The main reference numerals are as follows: 100. Lighting fixtures; 10. Condensing lenses; 20. Light sources; 11. Incident part; 111. First bottom surface; 112. First side surface; 12. Converging part; 121. Total reflection surface; 122. Cylindrical surface; 13. Exit part; 131. Second bottom surface; 132. Second side surface; 1321. First step; 1322. Second step; 1323. Third step. 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] In the field of photographic lighting, panel lights are frequently used. Panel lights typically consist of multiple LEDs arrayed at a certain spacing on a panel to form a panel light source. To improve the brightness of the light fixture, each LED needs to be equipped with a corresponding focusing lens to increase the illuminance of the light fixture. These focusing lenses include Fresnel lenses, convex lenses, and total internal reflection lenses. When the panel light fixture has a single color temperature or a small color temperature variation range, the focusing lenses for all LEDs with different color temperatures can be designed as the same type of lens. When individual LEDs with different color temperatures are converged onto the receiving screen by the same focusing lens, the light shape difference is small, and the light spot has a relatively uniform mixed lighting effect.
[0021] As photographic demands for color temperature increase, variable color temperature panel lights composed of arrays of white LEDs with different color temperatures can no longer provide a sufficiently wide range of color temperature variations. Furthermore, given the need for diverse color gamuts in shooting scenarios, the LEDs in panel lights are no longer simply white light sources, but rather colored light sources across various wavelengths. If different colored LEDs use the same focusing lens, the different focal lengths of the lenses for different wavelengths will result in varying emission angles. This prevents the different colored light spots on the receiving screen from overlapping effectively, leading to color layering and uneven light mixing.
[0022] In related technologies, different focusing lenses are designed for LEDs of different spectral bands to minimize differences in their emission angles, allowing for better stacking and uniform light mixing on the receiving screen. However, when the lamp has a variety of LED colors, more molds are required, making production and assembly complex, time-consuming, inconvenient, and costly.
[0023] Therefore, this application provides a condensing lens and a lamp that can produce beams with small differences in the exit angle after light sources of different spectra pass through the same condensing lens, solve the problem of color layering of light spots when multi-color light sources are mixed, achieve uniform light mixing, and only require the development of one condensing lens mold, thus reducing manufacturing costs.
[0024] The specific structure of the focusing lens of the present application embodiment is described in detail below with reference to the accompanying drawings.
[0025] Figure 1 This is a schematic diagram of the structure of the condenser lens provided in an embodiment of this application. Figure 2 for Figure 1 The diagram shows a cross-sectional view of the condenser lens along any plane containing the optical axis.
[0026] See Figure 1 and Figure 2 This application provides a condenser lens 10, which includes, along the optical axis, an incident portion 11, a converging portion 12, and an exiting portion 13. Figure 1 and Figure 2 The dotted line shown is the optical axis.
[0027] The incident section 11 is used to receive and refract light from the light source 20, the converging section 12 is used to perform total internal reflection and converge the light refracted by the incident section 11, and the exiting section 13 is used to homogenize and exit the light converged by the converging section 12. The condenser lens 10 is configured to ensure that the beam angle difference of incident light of different wavelengths after exiting is less than ±3°.
[0028] The condenser lens 10 can be made of glass or a transparent plastic material, such as polycarbonate, which meets optical requirements while being lightweight. Optionally, the condenser lens 10 has a refractive index n = 1.4918 ± 0.05 and an Abbe dispersion coefficient Vd = 57.441.
[0029] The light source 20 can be an LED chip, and its shape can be cylindrical or polygonal. The light-emitting surface of the LED chip can be a circle with a diameter of 2D or a square with a diagonal of 2D, where D is one unit of length. The LED chip can be a white light source with a color temperature in the range of 18000K-20000K, or a monochromatic light source with a center wavelength in the range of 420nm-680nm. Its full width at half maximum (FWHM) is within 10~30nm, and its color can cover the visible light range from blue light (420nm) to red light (680nm).
[0030] Light source 20 is disposed in incident section 11. The light emitted by light source 20 is received by incident section 11 and refracted into converging section 12. Converging section 12 performs total internal reflection on the light refracted by incident section 11 and then converges it into exit section 13. Exit section 13 homogenizes the light converged by converging section 12 and then emits it. Regardless of whether light source 20 is a white light source or a certain monochromatic light source, the final beam angle difference of incident light of different wavelengths after exiting is less than ±3°.
[0031] Optionally, one condenser lens 10 is adapted to one light source 20. When there are multiple light sources 20, the multiple light sources 20 are arrayed on a circuit board to form a panel light. Correspondingly, multiple condenser lenses 10 are arranged in an array and connected as a whole to form a condenser lens module. The multiple light sources 20 on the panel light can be various LED beads with different spectra, such as white light sources with different color temperatures, monochromatic light sources, and multi-color light sources composed of mixed colors. Multiple LED beads with different spectra can share the same size condenser lens 10, requiring only one set of molds for the condenser lens 10 to be developed, greatly reducing manufacturing costs.
[0032] Optionally, a condenser lens 10 can be adapted to multiple light sources 20. The panel light formed by arranging multiple light sources 20 in an array on a circuit board only needs to be enlarged proportionally. Only one mold for the condenser lens 10 needs to be developed, resulting in lower manufacturing costs, which can be determined according to specific usage requirements.
[0033] According to the condenser lens 10 and lamp provided in this application, by sequentially configuring the condenser lens 10 along the optical axis as an incident part 11, a converging part 12, and an exiting part 13, the incident part 11 is used to receive and refract light from the light source 20, the converging part 12 is used to perform total internal reflection and converge the light after it is refracted by the incident part 11, and the exiting part 13 is used to homogenize and emit the light after it is converged by the converging part 12, so that no matter whether the light source 20 is white light or monochromatic light of a specific wavelength, the beam angle difference after passing through the condenser lens 10 is less than ±3°, thereby effectively solving the problem of light spot color layering when multi-color light sources 20 are mixed, achieving uniform light mixing, and only one condenser lens 10 mold needs to be developed, reducing manufacturing costs.
[0034] In some embodiments, the incident portion 11 includes a first bottom surface 111 and a first side surface 112 that enclose and form a cavity. The first bottom surface 111 is disposed opposite to the light-emitting surface of the light source 20, and the first side surface 112 is gradually reduced along the optical axis. The light emitted by the light source 20 enters the converging portion 12 after being refracted by the first bottom surface 111 and the first side surface 112 respectively.
[0035] like Figure 2 As shown, the incident part 11 is a cavity structure formed by the first bottom surface 111 and the first side surface 112, which is used to accommodate the light source 20, and the light emitting surface of the light source 20 is arranged opposite to the first bottom surface 111.
[0036] Specifically, the end face of the incident part 11 is used to fix the circuit board of the LED lamp bead. A dam is formed around the incident part 11. The height h of the dam is equal to the height of the LED lamp bead after it is attached, h=(0.8±0.08)×D; the width of the dam around the incident part 11 is W2, W2=(3.8±0.2)×D, where D is the radius of the light emitting surface of the light source 20.
[0037] The first side surface 112 can be a conical surface or a pyramidal surface. Optionally, the preset angle st formed between the first side surface 112 and the optical axis is (7.344±0.3)×D, and the maximum opening width of the first side surface 112 is W1, where W1=(3.0±0.1)×D. The first side surface 112 is gradually tapered along the optical axis, which can expand the light receiving range and ensure that the cavity structure of the incident part 11 can efficiently receive large-angle light emitted by the light source 20, thereby significantly improving the luminous efficiency and brightness of the system.
[0038] Figure 3 for Figure 2 The diagram shows the geometric parameters of the condenser lens.
[0039] In some embodiments, the first bottom surface 111 is formed by rotating a first profile curve about an optical axis, and the equation of the first profile curve is: Y1=0.0181×D×X13-0.1945×D×X12-0.0121×D×X1-0.2724, (1) Wherein, the value range of X1 is [0, x1], x1 is the width of the first contour curve along the radial direction of the condenser lens 10, and x1 = (1.239 ± 0.08) × D, where D is the radius of the light-emitting surface of the light source 20.
[0040] like Figure 2 and Figure 3 As shown, the first bottom surface 111 is a smooth non-spherical freeform surface of revolution, which is formed by rotating the first contour curve around the optical axis. Taking the intersection point of the first bottom surface 111 and the optical axis as the origin, the direction of the optical axis as the Y1 axis, and the direction perpendicular to the optical axis as the X1 axis, a local coordinate system is established, and the equation of the first contour curve is shown in equation (1). Wherein, x1=(1.239±0.08)×D, and the maximum length of the first contour curve in the direction parallel to the optical axis is y1=(0.272±0.08)×D.
[0041] The light emitted by the light source 20 enters the incident part 11 of the condenser lens. Part of the light is refracted by the first side 112 and enters the converging part 12, while the other part of the light is refracted by the first bottom 111 and enters the converging part 12. The refraction of light of different colors or different color temperatures is precisely controlled, and the focus deviation caused by material dispersion is corrected in advance.
[0042] In some embodiments, the outer peripheral surface of the converging portion 12 includes a total reflection surface 121, which is formed by rotating a second profile curve about the optical axis. The equation of the second profile curve is: Y2=0.0952×D×X23+0.0249×D×X22-0.6840×D×X2-0.0124, (2) Wherein, the value range of X2 is [0, x2], x2 is the width of the second contour curve along the radial direction of the condenser lens 10, and x2 = (2.559 ± 0.1) × D, where D is the radius of the light-emitting surface of the light source 20.
[0043] like Figure 2 and Figure 3 As shown, the outer peripheral surface of the converging part 12 includes a total reflection surface 121, which is a smooth non-spherical freeform surface of revolution, formed by rotating the second profile curve around the optical axis. Taking the intersection point of the total reflection surface 121 and the surrounding dam of the incident part 11 as the origin, the direction parallel to the optical axis is Y2, and the direction perpendicular to the optical axis is X2, a local coordinate system is established, and the equation of the second profile curve is as shown in equation (2). Wherein, x2=(2.559±0.1)×D, and the maximum length of the second profile curve in the direction parallel to the optical axis is y2=(3.519±0.1)×D.
[0044] The total reflection surface 121 performs total reflection and convergence on the light rays refracted by the incident part 11. The energy efficiency of total reflection is much higher than that of refraction, which enables the condenser lens 10 to achieve extremely high light-gathering efficiency with almost no light energy loss while maintaining a small size.
[0045] Optionally, the outer peripheral surface of the converging part 12 also includes a cylindrical surface 122, which connects to the maximum diameter of the total reflection surface 121. This helps to reduce the maximum outer diameter of the condensing lens 10, thereby reducing the overall volume of the condensing lens 10. In injection mold design, sharp edges (i.e., the junction between the end of the total reflection surface 121 and the cylindrical surface 122) are prone to stress concentration or demolding difficulties. The cylindrical surface 122 can provide a smooth transition, eliminating processing dead angles; at the same time, it prevents unnecessary total reflection or scattering of light at the junction, ensuring that light can smoothly enter the multiple stepped areas of the exit part 13.
[0046] The cylindrical surface 122 can be a smooth surface, and optical microstructures, such as microlens arrays or microprism arrays, can also be set on the cylindrical surface 122. The optical microstructures can perform secondary refraction or scattering of light passing through the cylindrical surface 122, further optimizing the angle distribution of light entering the multiple step regions of the exit section 13 and improving the uniformity of the light spot; through the directional reflection or absorption of the optical microstructures, ineffective scattering of light at the junction of the cylindrical surface 122 and the total internal reflection surface 121 can also be suppressed, reducing the proportion of stray light; considering the curved surface characteristics of the cylindrical surface 122, the optical microstructures can also adjust the light emission path, enhance the light extraction efficiency, reduce total internal reflection loss, and ensure that more light enters the exit section 13 smoothly to participate in homogenization.
[0047] In some embodiments, the emission portion 13 includes a second bottom surface 131 and a second side surface 132 that enclose and form a cavity. The second bottom surface 131 is a light-emitting surface, and the second side surface 132 includes a plurality of steps that gradually expand outward along the optical axis.
[0048] like Figure 2 As shown, the light emitted by the light source 20 is highly focused after being refracted by the incident part 11 and totally reflected by the converging part 12. The uneven beam of light is dispersed and mixed by multiple steps that gradually expand outward through the exit part 13, and finally forms a circular light spot with uniform illumination and smooth transition.
[0049] Specifically, the second side 132 includes multiple steps that gradually expand outward along the optical axis. Each step has two mutually perpendicular step surfaces, and each step surface is an independent optical surface at a certain angle to the optical axis. When light rays from the converging part 12 strike the multiple step surfaces at different incident angles, continuous refraction occurs. Because the multiple steps gradually expand outward along the optical axis, the central part of the originally concentrated beam exits at a more positive angle from the top step surface, while the edge part of the beam is refracted towards a more central direction when exiting from the lower step surface. Through this series of precisely defined refractions, the light is redistributed, filling the brightness difference between the center and the edge, thereby controlling the light emission angle and making the energy distribution more uniform.
[0050] Ideally, a perfectly circular emitting surface would produce a light spot with ring-shaped fringes resembling an "Airy disk." Multiple steps divide a complete, continuous emitting aperture into multiple concentric ring regions. Each step produces its own sub-spot. These sub-spots overlap and superimpose on a distant receiving screen. Because light passes through steps of varying heights, optical path differences are introduced, disrupting wavefront coherence and effectively breaking down and eliminating unwanted ring-shaped fringes, resulting in a very clean and smooth final light spot. Microscopically, the steps increase the depth of the emitting portion along the optical axis, forming a three-dimensional emitting aperture. This is equivalent to increasing the apparent size of the light source 20. According to optical principles, a larger light source 20 typically produces a more uniform light spot. Multiple steps, by increasing the minute differences in the optical path, promote further mixing of light during propagation, thereby improving the homogenization effect.
[0051] Thus, the multiple stepped surfaces of the second side 132 are responsible for scattering and mixing the light, while the second bottom surface 131 is responsible for calibrating and guiding the light. The two work together to transform the concentrated beam from the converging part 12 into a high-quality light spot with accurate angle and uniform illumination.
[0052] In some embodiments, the second bottom surface 131 is formed by rotating a third profile curve about the optical axis, and the equation of the third profile curve is: Y3=-0.0387×D×X33+0.0407×D×X32-0.0353×D×X3+0.7869, (3) Wherein, X3 takes values in the range [0, x3], x3 is the width of the third contour curve along the radial direction of the condenser lens 10, and x3 = (3 ± 0.1) × D, where D is the radius of the light-emitting surface of the light source 20.
[0053] like Figure 2 and Figure 3As shown, the second bottom surface 131 is a smooth non-spherical freeform surface of revolution, which is formed by rotating the third contour curve around the optical axis. Taking the intersection point of the center of the second bottom surface 131 and the optical axis as the origin, the direction parallel to the optical axis is Y3, and the direction perpendicular to the optical axis is X3, a local coordinate system is established, and the equation of the third contour curve is as shown in equation (3). Wherein, x3=(3±0.1)×D, and the maximum length of the third contour curve in the direction parallel to the optical axis is y3=(0.784±0.08)×D.
[0054] The second bottom surface 131 performs final refraction and angle fine-tuning on the beam after it has been initially homogenized by multiple stepped surfaces of the second side surface 132, ensuring that the main beam is emitted at the designed desired angle, and ultimately ensuring that light spots of different colors can not only be superimposed, but also mixed evenly to form high-quality lighting spots with pure colors, no stripes, and no color separation.
[0055] In some embodiments, the plurality of steps include a first step 1321, a second step 1322, and a third step 1323 that gradually expand outward along the optical axis. The lengths of the first step 1321, the second step 1322, and the third step 1323 along the optical axis are h1, h2, and h3, respectively, and the widths of the first step 1321, the second step 1322, and the third step 1323 along the direction perpendicular to the optical axis are m1, m2, and m3, respectively, and satisfy the following condition: h1=(0.259±0.08) ×D, h2=(0.199±0.08) ×D, h3=(0.409±0.05) ×D; m1=(0.411±0.08)×D, m2=(0.557±0.08)×D, m3=(0.532±0.08)×D, Where D is the radius of the light-emitting surface of the light source 20.
[0056] like Figure 2 and Figure 3 As shown, the multiple steps include a first step 1321, a second step 1322, and a third step 1323 that gradually expand outward along the optical axis. This is equivalent to decomposing a large-angle refraction into three small-angle, discrete, and precisely controllable refraction steps. The height and width of each step can be independently optimized, allowing for more precise control over the direction of light, achieving excellent uniform light distribution and spot quality. This effectively eliminates the central bright spot or stray halo that may be produced by ordinary lenses, resulting in a uniform and smooth illuminance distribution on the receiving screen, without obvious bright-dark boundaries.
[0057] In some embodiments, an optical microstructure is provided on the second bottom surface 131; and / or, an optical microstructure is provided on a plurality of steps of the second side surface 132.
[0058] Optical microstructures can be, for example, microlens arrays or microprism arrays. For the second bottom surface 131, the optical microstructure can act as an optical diffuser. On the one hand, it can effectively suppress moiré fringes and speckle, making the projected light spot or image cleaner and smoother, significantly improving visual comfort and display quality. On the other hand, it can also perform more refined secondary distribution of the light field. For example, the microstructure in the central region can guide a small amount of light to the edge, filling the illuminance attenuation area and achieving more perfect illuminance uniformity. This makes the transition of the light spot from the center to the edge smooth and gradual, without obvious light and dark boundaries, meeting the extreme requirements of light softness for high-end applications such as film and television shooting.
[0059] For the multiple steps on the second side 132, the smooth step surface primarily alters the angle of light through refraction, and its control is relatively "regular." Creating microstructures on the step surface is equivalent to adding a miniature diffusion function to each step. When light strikes the step surface, it is not only refracted but also scattered at different angles on a microscale by the microstructures, greatly enhancing the mixing ability of the light. Light of different colors and angles is more thoroughly dispersed and mixed as it passes through the microstructures, ensuring ultimate color uniformity in the far field and eliminating the possibility of color layering.
[0060] Furthermore, during large-scale injection molding production, large-area smooth optical surfaces are prone to minor defects such as shrinkage and scratches, which can form shadows or bright lines on the light spot. Optical microstructures themselves are finely textured surfaces that can effectively mask those nanometer or micrometer-level processing defects, reducing the extreme demands on mold precision and injection molding processes, improving product yield and consistency, and lowering overall costs.
[0061] In some embodiments, the minimum thickness between the first bottom surface 111 and the second bottom surface 131 is t, and t = (5.189 ± 0.1) × D, where D is the radius of the light-emitting surface of the light source 20.
[0062] like Figure 2 and Figure 3 As shown, the first bottom surface 111 is a curved surface convex in the opposite direction of the optical axis, and the second bottom surface 131 is a curved surface convex in the direction of the optical axis. The distance between the edge of the first bottom surface 111 and the edge of the second bottom surface 131 is the minimum thickness t. After optical simulation optimization analysis, t = (5.189 ± 0.1) × D, which ensures that the light has enough space within the condenser lens 10 to propagate according to the designed optical path, avoiding optical aberrations due to insufficient thickness or unnecessary volume and material waste due to excessive thickness. At the same time, the condenser lens 10 has sufficient mechanical strength, facilitating injection molding and daily use, and preventing deformation.
[0063] Furthermore, the geometric dimensions of the condenser lens 10 in this embodiment are all within a specified tolerance range. Within this tolerance range, all condenser lenses 10 can ensure that when the light source 20 is white light with a color temperature in the range of 18000K-20000K, the angle error of the emitted beam from any two color temperature spectra after passing through the condenser lens 10 is < ±3°. When the light source 20 is any monochromatic light with a center wavelength in the range of 420nm-380nm and an FWHM in the range of 10nm-30nm, the angle deviation of the emitted beam from any two monochromatic lights is < ±2°. The tolerance range set for the geometric dimensions ensures the stability and feasibility of this optical effect in mass production.
[0064] Figure 4 This is a schematic diagram of the structure of the lamp provided in the embodiment of this application.
[0065] See Figure 4 This application provides a lamp 100, including a light source 20 and a condenser lens 10 of this application. The light source 20 is disposed on the incident portion 11 of the condenser lens 10, and the light emitting surface of the light source 20 is disposed facing the converging portion 12 of the condenser lens 10.
[0066] The lamp 100 can be used for photographic fill light or film and television shooting. It adopts the focusing lens 10 of this application, which has high light focusing efficiency, uniform light spot, and strong compatibility. It can be used flexibly with monochromatic light or multicolor light, and can provide high-quality lighting with a wide color gamut and uniform light mixing. It outputs pure color light without impurities, which meets the stringent requirements of high-end application scenarios for light color. It brings great convenience to the photographic fill light industry and enhances the core competitiveness of end products.
[0067] In some embodiments, there are multiple light sources 20 and multiple condenser lenses 10, with the multiple light sources 20 arranged in an array and the multiple condenser lenses 10 arranged in an array and connected as one unit.
[0068] Multiple light sources 20 are arranged in an array to form a panel light. The multiple light sources 20 have different spectra, and can be white light sources of different color temperatures or monochromatic light sources of different colors. Each light source 20 corresponds to a condenser lens 10, and the multiple condenser lenses 10 are arranged in an array and connected as a whole. Optionally, the multiple condenser lenses 10 are integrally formed through the cylindrical surface 122 of the converging part 12, and the gaps between the cylindrical surfaces 122 of adjacent condenser lenses 10 can be filled with the same material as the condenser lenses 10, such as polycarbonate, thereby forming a complete modular condenser lens module.
[0069] In addition, this application embodiment also provides a condensing lens module, including a plurality of condensing lenses 10 of this application, which are arranged in an array and connected as a whole.
[0070] The modular design of the condenser lens module ensures the consistency of the array light spot, guarantees the consistent positioning accuracy and optical performance of multiple condenser lenses 10 on the panel light, and ensures the uniformity of light output of the entire luminaire 100, avoiding pitting or streaks caused by installation errors of individual condenser lenses 10. In addition, the modular design is more conducive to heat dissipation management, improving the stability and lifespan of the luminaire 100.
[0071] The illuminance of the light spot formed on the receiving screen after the light source of different spectra is focused by the condenser lens 10 is described in detail below with reference to specific embodiments.
[0072] The luminaire 100 can be equipped with various light sources 20 of different spectra. All light sources 20 are LED beads with identical geometric dimensions. The cross-section of the emitting surface of each LED bead is square with a side length of 1.41 mm, and the radius of its circumscribed circle is D = 1 mm. A receiving screen measuring 2000 mm × 2000 mm is placed 500 mm in front of the emitting surface of the luminaire 100. The beam angle corresponding to half the central illuminance at the spot illuminance on the receiving screen is used as an example for comparison.
[0073] Figure 5 This diagram illustrates the light spot displayed on the receiving screen when the luminaire 100 is equipped with a white light source. Figure 6 for Figure 5 The light distribution curve of the white light source is shown. It can be seen that when the LED light bead has a white light spectrum with a color temperature of 5600K, after being focused by the condenser lens 10, the light spot on the receiving screen is as follows... Figure 6 As shown, the beam angle corresponding to half the central illuminance is 34.5°.
[0074] Figure 7 The diagram shows a schematic of the light spot displayed on the receiving screen when the luminaire 100 is equipped with a monochromatic red light source. Similarly, when the LED bead is a monochromatic red light source, using the Gaussian speed of light model: center wavelength 625nm, FWHM = 20nm, Sigma = 8.5, after being focused by the condenser lens 10, the light spot on the receiving screen is as follows. Figure 7 As shown, the beam angle corresponding to half the central illuminance is 34.4°.
[0075] Figure 8 The diagram shows a schematic of the light spot displayed on the receiving screen when the luminaire 100 is equipped with a monochromatic blue light source. Similarly, when the LED beads are monochromatic blue light sources, using the Gaussian speed of light model: center wavelength 447nm, FWHM=20nm, Sigma=8.5, after being focused by the condenser lens 10, the light spot on the receiving screen is as follows. Figure 8 As shown, the beam angle corresponding to half the central illuminance is 34.1°.
[0076] Figure 9The diagram shows a schematic of the light spot displayed on the receiving screen when the luminaire 100 is equipped with a monochromatic green light source. Similarly, when the LED beads are a monochromatic green light source, using the Gaussian speed of light model: center wavelength 447nm, FWHM=20nm, Sigma=8.5, after being focused by the condenser lens 10, the light spot on the receiving screen is as follows. Figure 9 As shown, the beam angle corresponding to half the central illuminance is 34.2°.
[0077] As can be seen, after the focusing lens 10 of this application focuses the white light source and the monochromatic light source respectively, the angle difference of their emitted beams is small (both less than ±3°), and they can be relatively uniformly superimposed on the receiving screen. When the light source is a panel light composed of multiple LED beads arrays with the same emitting surface, the LED beads with different spectra can be uniformly superimposed on the receiving screen after being converged by the independent focusing lens 10, thereby achieving a relatively uniform light mixing effect over a wide color gamut, meeting the ultimate requirements of light color for high-end applications such as film and television shooting.
[0078] It should be understood that 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. Features defined with "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.
[0079] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims. In conclusion, the above description is merely a preferred embodiment of the technical solution of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.
Claims
1. A condensing lens, characterized in that, The condenser lens (10) comprises, in sequence along the optical axis: An incident part (11) is used to receive and refract light from a light source (20); Converging section (12) for total internal reflection and convergence of light rays refracted by the incident section (11); and The emission section (13) is used to homogenize and emit the light rays that have been converged by the converging section (12); The condenser lens (10) is configured such that the difference in beam angle after incident light of different wavelengths is less than ±3°.
2. The condenser lens according to claim 1, characterized in that, The incident part (11) includes a first bottom surface (111) and a first side surface (112) that enclose and form a cavity. The first bottom surface (111) is disposed opposite to the light-emitting surface of the light source (20). The first side surface (112) is gradually narrowed along the optical axis. The light emitted by the light source (20) enters the converging part (12) after being refracted by the first bottom surface (111) and the first side surface (112).
3. The condenser lens according to claim 2, characterized in that, The first bottom surface (111) is formed by rotating a first contour curve around the optical axis, and the equation of the first contour curve is: Y1=0.0181×D×X1 3 -0.1945×D×X1 2 -0.0121×D×X1-0.2724, where the value of X1 is in the range of [0, x1], x1 is the width of the first contour curve along the radial direction of the condenser lens (10), and x1=(1.239±0.08)×D, where D is the radius of the light-emitting surface of the light source (20).
4. The condenser lens according to claim 1, characterized in that, The outer peripheral surface of the converging part (12) includes a total reflection surface (121), which is formed by rotating a second profile curve around the optical axis. The equation of the second profile curve is: Y2=0.0952×D×X2 3 +0.0249×D×X2 2 -0.6840×D×X2-0.0124, where the value of X2 is in the range of [0, x2], x2 is the width of the second contour curve along the radial direction of the condenser lens (10), and x2=(2.559±0.1)×D, where D is the radius of the light-emitting surface of the light source (20).
5. The condenser lens according to claim 2, characterized in that, The emission section (13) includes a second bottom surface (131) and a second side surface (132) that enclose and form a cavity. The second bottom surface (131) is the light emission surface, and the second side surface (132) includes multiple steps that gradually expand outward along the optical axis.
6. The condenser lens according to claim 5, characterized in that, The second bottom surface (131) is formed by rotating a third contour curve around the optical axis, and the equation of the third contour curve is: Y3 = -0.0387 × D × X3 3 +0.0407×D×X3 2 -0.0353×D×X3+0.7869, where X3 ranges from [0, x3], x3 is the width of the third contour curve along the radial direction of the condenser lens (10), and x3=(3±0.1)×D, where D is the radius of the light-emitting surface of the light source (20).
7. The condenser lens according to claim 5, characterized in that, The plurality of steps include a first step (1321), a second step (1322), and a third step (1323) that gradually expand outward along the light-emitting direction of the optical axis. The lengths of the first step (1321), the second step (1322), and the third step (1323) along the optical axis are h1, h2, and h3, respectively. The widths of the first step (1321), the second step (1322), and the third step (1323) along the direction perpendicular to the optical axis are m1, m2, and m3, respectively, and satisfy the following condition: h1=(0.259±0.08) ×D, h2=(0.199±0.08) ×D, h3=(0.409±0.05) ×D; m1=(0.411±0.08)×D, m2=(0.557±0.08)×D, m3=(0.532±0.08)×D, where D is the radius of the light-emitting surface of the light source (20).
8. The condenser lens according to claim 5, characterized in that, The second bottom surface (131) is provided with an optical microstructure; And / or, optical microstructures are respectively provided on the multiple steps of the second side (132).
9. The condenser lens according to claim 5, characterized in that, The minimum thickness between the first bottom surface (111) and the second bottom surface (131) is t, and t = (5.189 ± 0.1) × D, where D is the radius of the light-emitting surface of the light source (20).
10. A lamp, characterized in that, Includes a light source (20) and a condenser lens (10) as described in any one of claims 1 to 9, wherein the light source (20) is disposed at the incident portion (11) of the condenser lens (10), and the light emitting surface of the light source (20) is disposed facing the converging portion (12) of the condenser lens (10).
11. A condenser lens module, characterized in that, It includes a plurality of condensing lenses (10) as described in any one of claims 1 to 9, wherein the plurality of condensing lenses (10) are arranged in an array and connected as a whole.