Composite lens system capable of eliminating blue light

Abstract

The invention relates to a composite lens system capable of eliminating blue light in the field of optical illumination and imaging, which comprises a reflection cup, a light source, a reflection sheet and a convex lens, and is characterized in that the convex lens comprises a first lens body and a second lens body which are integrally formed, and the first lens body and the second lens body are vertically combined side by side to form the convex lens; the first lens body and the second lens body both adopt curved surface design, the first lens body forms an aberration-free imaging area through the first curved surface design and is used for forming a clear image on a target imaging surface, and the second lens body forms a controllable aberration area through the second curved surface design and is used for forming a blurred image with preset blurring degree on the target imaging surface. Local blue light gathering at the edge of an imaging surface is thoroughly eliminated, the problems of visual fatigue and glare are solved, the effective illumination distance and safety in severe weather such as rain and fog are remarkably improved, active and partitioned accurate control over dispersion and aberration is achieved, and the structural dispersion problem which cannot be solved in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of optical illumination and imaging, and more specifically to a composite lens system capable of eliminating blue light. Background Technology

[0002] In optical systems, convex lenses are widely used to converge light rays, form specific light spots, or create sharp images. However, due to the inherent dispersive properties of optical materials—that is, different wavelengths (colors) of light have different refractive indices in lenses—short-wavelength blue light (approximately 450 nm) is refracted more severely than long-wavelength yellow light (approximately 580 nm) after passing through a lens. This principle leads to a common technical problem: chromatic aberration, which produces colored fringing at the edges of the image and can cause different colors of light to converge at different focal points.

[0003] In practical applications (such as vehicle headlights), to meet regulatory requirements for beam patterns (such as cut-off lines), reflectors (or stencils) are often placed in front of the lens to block part of the beam. This structure further exacerbates the negative effects of chromatic aberration. Figure 1 and Figure 2 As shown, the dispersion effect is particularly pronounced at the edge of the beam after it is truncated by the reflector. Because blue light has a larger refraction angle, it is strongly "compressed" and concentrated in the upper edge region of the imaging surface, forming a significant blue band or blue rim.

[0004] This high-energy blue light, concentrated in specific areas (especially key areas of the field of view), brings several serious technical drawbacks:

[0005] 1) Unpleasant visual sensory effects: The human eye's lens exhibits axial chromatic aberration when focusing blue light, requiring continuous adjustment to see the edges of blue light clearly, which can easily lead to accommodative visual fatigue. Simultaneously, blue light is more strongly scattered within the eye's intraocular media, producing a "fog" effect and glare, reducing subjective visual comfort and safety.

[0006] 2) Performance degradation in adverse weather conditions: In murky media such as rain, fog, and haze, the intensity of blue light due to Rayleigh and Mie scattering is much higher than that of yellow light, drastically reducing its effective illumination distance. The blue light concentrated on the imaging surface forms a "light curtain effect" through forward scattering, which actually reduces the contrast of obstacles in front, posing a safety hazard.

[0007] 3) Limitations of existing technology: Traditional solutions focus on overall achromatic design (such as using biplex lenses), aiming to reduce chromatic aberration evenly across the entire field of view. However, such methods cannot specifically address the localized and concentrated blue light aggregation problem caused by structures such as reflectors. In other words, within the existing technological framework, this blue light aggregation at the edge of the imaging surface, determined by structure, is considered an inherent defect that is difficult to avoid; it cannot be effectively eliminated, nor are there any means to actively control or cover it. Summary of the Invention

[0008] The purpose of this invention is to overcome the aforementioned deficiencies of the prior art and provide an innovative lens system. This system not only needs to effectively eliminate or cover harmful blue light accumulation in key areas of the imaging surface (such as the upper edge of the illumination area), but also should be able to actively regulate the dispersion distribution, guiding the more penetrating and visually comfortable yellow light to the key areas, thereby improving the overall optical performance, environmental adaptability, and eye-friendliness of the illumination system. This addresses the inherent defect of significant blue light accumulation in the prior art.

[0009] The objective of this invention is achieved through the following means:

[0010] A composite lens system capable of eliminating blue light includes a reflector cup, a light source, a reflector sheet, and a convex lens. The reflector cup includes an entrance opening and an exit opening. The inner wall of the reflector cup is an arc-shaped reflective surface. The reflector sheet and the convex lens are sequentially arranged in front of the exit opening, with the reflector sheet positioned between the reflector cup and the convex lens. The side of the reflector sheet opposite to the exit opening is a flat reflective surface. The edge of the reflector sheet near the convex lens is a cutoff line. The light source is located at the entrance opening of the reflector cup, and the illumination direction of the light source is towards the entrance opening of the reflector cup. The convex lens includes an integrally formed first... A first lens body and a second lens body are arranged side by side, one above the other, to form a convex lens. The first lens body and the second lens body have different focal lengths, and the focal length of the first lens body is smaller than that of the second lens body. The first lens body forms an aberration-free imaging area through a first curved surface design, which is used to form a clear image on the target imaging surface. The second lens body forms a controllable aberration area through a second curved surface design, which is used to form a blurred image with a preset blur degree on the target imaging surface. Both the first curved surface design and the second curved surface design adopt an aspherical design.

[0011] After the light emitted by the light source is reflected by the reflector, part of the light is cut off by the reflector and continues to the second lens. The light refracted by the controllable aberration zone forms a blurred image on the target imaging surface. The other part of the light is reflected by the reflector and continues to the first lens. The light refracted by the aberration-free imaging zone forms a clear image on the target imaging surface. The clear image is offset relative to the blurred image in a preset direction. The clear image is offset along the boundary area where the blurred image is cut off by the punctured light to a point beyond the boundary area. The clear image completely covers the boundary area where the blurred image is cut off by the punctured light through the offset.

[0012] Furthermore, a step is formed on the boundary line connecting the first curved surface design and the second curved surface design.

[0013] Furthermore, the height of the light-receiving surface of the second lens is greater than the height of the light-receiving surface of the first lens.

[0014] Furthermore, the light-receiving surface height of the second lens accounts for 51%-60% of the total light-receiving surface height. The larger light-receiving surface height of the second lens allows for the distribution of more original light, ensuring sufficient brightness and uniformity in the background illumination. This height difference reflects the design concept of "distribution on demand," enabling both lenses to operate at their optimal state. This proportional range ensures the best balance between the sharpness of the cutoff line and the sufficiency of the background illumination.

[0015] Aspherical lenses, by modifying the curved surface shape, force peripheral and central rays to converge at the same point. Almost all light rays passing through the lens aperture are "converged" onto the target image point or light spot. This means that, with the same light source and lens size, the light intensity in the core illumination area is higher and more concentrated. This is the essence of strong "light-gathering" ability—converting the light energy within the optical aperture into effective luminous flux for target illumination more efficiently.

[0016] Furthermore, the end face of the convex lens near the reflector is an arc-shaped concave surface. The arc-shaped concave surface and the convex surface on the other side of the convex lens together form a concave-convex lens structure, but overall it still maintains the characteristics of a positive lens that is thicker in the center and thinner at the edges. The arc-shaped concave surface optimizes the light propagation path, reduces spherical aberration, and makes the brightness distribution inside the light spot more uniform.

[0017] The beneficial effects of this invention are as follows:

[0018] 1) It completely eliminates the local blue light concentration at the edge of the imaging surface, solving the problems of visual fatigue and glare. By designing the first and second curved surfaces, both of which are aspherical, the second lens produces a blurred image (by weakening the blue light intensity through blurring). Simultaneously, the clear image produced by the first lens is actively shifted to completely cover the boundary area (blue light area) where the blurred image is truncated by the cut-off light rays. The clear image can accurately cover and "replace" part of the blurred image and its original boundary area (blue light area). After being covered, the combined light effect of other areas of the blurred image away from the blue light area is fuller and softer. Therefore, in the final illuminated area, the upper edge observed by the human eye is a clear yellow light formed by the first lens, rather than a highly dispersed blue rim. This fundamentally eliminates the "glaring" sensation and eye accommodation pressure caused by local blue light concentration in the prior art, greatly improving visual comfort and safety.

[0019] 2) Significantly improves effective illumination distance and safety in adverse weather conditions such as rain and fog. Since the clear image is mainly dominated by the more penetrating yellow light component (due to aberration correction, the spectrum is purer and better mixed), its Rayleigh and Mie scattering in rain and fog is greatly reduced, thus effectively suppressing the "light curtain effect." This makes the illumination light more penetrating and can more effectively illuminate distant obstacles, while reducing the interference light scattered back into the driver's eyes, significantly improving driving safety in adverse weather conditions. The blurred image produced by the second lens is covered and overlapped with the clear image, resulting in more uniform light effect and no interference with the main illumination area.

[0020] 3) It achieves active, zoned, and precise control of chromatic aberration and aberration, solving the structural chromatic aberration problem that existing technologies cannot overcome. This invention creatively divides the lens into zones and designs independent curved surfaces for each zone. The first lens is specifically responsible for achieving perfect aberration correction in key areas, while the second lens is given the function of generating preset blur. This design concept of "zoned treatment with overlapping coverage" achieves, for the first time, the targeted elimination of local chromatic aberration problems caused by light-cutting structures, which is a breakthrough in optical design concepts.

[0021] 4) While achieving high performance, the design maintains structural compactness and stability. Through a partitioned design of a single lens element, two imaging zones are integrated onto a single optical lens, replacing the complex optical correction and coverage functions that might otherwise require multiple lens groups. The integrated structure avoids the errors and costs associated with assembling and adjusting multiple components, ensuring system stability and reliability. Furthermore, this design requires no changes to existing core structures such as reflectors and reflectors, making it easy to upgrade and modify on existing product platforms, thus possessing high practicality and industrialization value. Attached Figure Description

[0022] Figure 1 The image is a simulated image of the lens system after light has been truncated in the background art.

[0023] Figure 2 The background section presents a simulated optical path diagram of a reflective lens system.

[0024] Figure 3 This is a simulation image of the composite lens system that can eliminate blue light according to the present invention;

[0025] Figure 4 This is a simulation optical path diagram of the composite lens system for eliminating blue light according to the present invention;

[0026] Figure 5 This is a simplified optical path diagram of the composite lens system for eliminating blue light according to the present invention.

[0027] Figure 6This is a simulated image of light illuminating the second lens body after passing through a reflector in the composite lens system of the present invention that can eliminate blue light;

[0028] Figure 7 This is a simulated optical path diagram of light entering the second lens body via a reflector in the composite lens system of the present invention that can eliminate blue light;

[0029] Figure 8 This is a simulated image of light illuminating the first lens body after passing through a reflector in the composite lens system of the present invention that can eliminate blue light;

[0030] Figure 9 This is a simulated optical path diagram of light entering the first lens body via a reflector in the composite lens system of the present invention that can eliminate blue light;

[0031] Figure 10 This is a diagram illustrating the software process for setting parameters of a convex lens in optical design, which is part of the implementation process of the blue light-eliminating composite lens system of this invention.

[0032] Figure 11 This is a three-dimensional structural diagram of the composite lens system for eliminating blue light according to the present invention.

[0033] Figure 12 This is a schematic diagram of the three-dimensional structure of the convex lens in the composite lens system that can eliminate blue light according to the present invention.

[0034] Figure 13 This is a three-dimensional structural diagram of the blue light-eliminating composite lens system of the present invention applied to vehicle lighting.

[0035] Figure 14 This is an exploded view of the structure of the blue light-eliminating composite lens system of the present invention applied to vehicle lighting.

[0036] Figure 15 This is a schematic diagram showing the unmerged state of a blurred image and a clear image in the blue light-eliminating composite lens system of the present invention;

[0037] In the diagram, 1-reflector cup, 2-light source, 3-reflector sheet, 4-convex lens, 401-first lens body, 402-second lens body, 403-step, 5-lamp body, 6-cooling fan, 7-LED light panel, 8-back cover plate. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0039] In this embodiment, refer to Figures 3-15 The specific implementation of the blue light-eliminating composite lens system includes a reflector cup 1, a light source 2, a reflector sheet 3, and a convex lens 4. For example... Figure 11 and Figure 14As shown, the reflector cup 1 is roughly bowl-shaped, with a light-inlet opening at one end and a light-outlet opening at the other end. Its inner wall is a smooth, arc-shaped reflective surface, preferably an ellipsoid or a freeform surface, used to converge and reflect light. The light source 2 is an LED lamp bead, which is installed at the light-inlet opening of the reflector cup 1, and the center of its light-emitting chip is located near the geometric focal point of the reflector cup 1, with the light emission direction facing inwards towards the reflector cup 1.

[0040] Reflector 3 and convex lens 4 are sequentially positioned in front of the light-emitting opening of reflector cup 1. Reflector 3 is horizontally positioned (i.e., its main plane is approximately parallel to the ground) between reflector cup 1 and convex lens 4. The side of reflector 3 facing the light-emitting opening is a flat, reflective surface used to reflect some of the light from reflector cup 1 upwards. The edge of reflector 3 near convex lens 4 forms an arc-shaped cutoff line.

[0041] The core of this invention lies in the design of the convex lens 4. For example... Figures 11-12 As shown, the convex lens 4 is a plano-convex lens 4, with its flat surface facing backward and close to the reflector 3, and its convex surface facing forward. The end face of the convex lens 4 near the reflector 3 is an arc-shaped concave surface, which makes the brightness distribution inside the light spot more uniform, the light transition more natural, and there are no abrupt bright spots or dark areas, thus improving the overall lighting quality. In this embodiment, the convex lens 4 can be injection molded from PMMA or PC material. The convex lens 4 is integrally formed by the first lens body 401 and the second lens body 402 through the injection molding process. The first lens body 401 constitutes the upper half of the convex lens 4, and the second lens body 402 constitutes the lower half of the convex lens 4. The two are arranged side by side to form a complete convex lens that is similar to a circle. Figure 12 As shown, to save space and achieve the best light-gathering surface, the four side edges of the convex lens are directly "cut off," making the light-gathering surface of the convex lens larger. Screw holes for locking and positioning are provided at the four corners of the convex lens. The convex lens 4 in this embodiment can also be made of glass, such as a conventionally cold-worked convex lens, or a precision-molded lens.

[0042] In a preferred embodiment, the focal length of the first lens 401 is smaller than that of the second lens 402. For example, in this embodiment, the vertex radius of curvature of the first lens 401 is designed to be 15.0 mm (curvature approximately 0.067 mm⁻¹), while the vertex radius of curvature of the second lens 402 is designed to be 18.5 mm (curvature approximately 0.054 mm⁻¹). This difference in curvature results in a larger deflection angle for the light rays passing through the first lens 401, thereby producing a greater offset on the target imaging surface. This light deflection control based on the curvature difference, in conjunction with the different aspherical coefficients of the two lenses, is the optical basis for ensuring that a sharp image can produce a predetermined offset in the vertical direction relative to a blurred image and cover its boundary region. Correspondingly, this difference in curvature is also reflected in the difference in focal length, with the focal length of the first lens 401 (19.3 mm) being smaller than that of the second lens 402 (20.3 mm).

[0043] As another preferred embodiment, due to the difference in optical curvature between the first lens body 401 and the second lens body 402, a small arc-shaped step 403 exists at the boundary between the optical surfaces of the first lens body 401 and the second lens body 402 (e.g., ...). Figure 12 (As shown). This step 403 is a natural manifestation of the different surface designs of the two lenses on the mold. Its height can be controlled between 0.05-0.5mm to ensure optical functional zoning without affecting structural strength. The first lens body 401 and the second lens body 402, two aspherical surfaces with different coefficient groups, are integrated into the same lens model during the mold design stage. Figure 12 As shown, the two curved surfaces are smoothly connected at the dividing line or by micro-steps 403, and a complete convex lens 4 is manufactured by a one-time injection molding process.

[0044] Furthermore, the light-receiving surface height H2 of the second lens 402 (i.e., its dimension in the direction perpendicular to the optical axis) is greater than the light-receiving surface height H1 of the first lens 401. In a specific design, H2 accounts for approximately 55% of the total light-receiving surface height (H1+H2) (i.e., within the range of 51%-60%) to ensure sufficient light flux through the lower half to generate background illumination, thereby achieving the optimal brightness ratio.

[0045] The blue light-eliminating composite lens system of this embodiment can be applied to various lighting systems and lighting fixtures, such as household lighting fixtures and automotive lighting fixtures. Specifically, the blue light-eliminating composite lens system of this embodiment can be applied to automotive lighting fixtures, such as… Figure 13 and Figure 14As shown. This vehicle-mounted lighting lamp includes a lamp body 5, a cooling fan 6, an LED light panel 7, a reflector cup 1, a reflector sheet 3, and a convex lens 4. The cooling fan 6 is installed at the rear end of the lamp body 5, and a rear cover plate 8 is provided at the rear end of the lamp body 5 and secured with screws. The convex lens 4 is installed at the front end of the lamp body 5 and secured with screws. The reflector sheet 3 is horizontally positioned between the LED light panel 7 and the convex lens 4. The illumination direction of the LED light panel 7 is towards the reflector cup 1. The light emitted by the LED beads on the LED light panel 7 is reflected by the reflector cup 1. Part of the light is partially blocked by the reflector sheet 3 and continues to shine on the second lens body 402. The light refracted through the controllable aberration zone forms a blurred image on the target imaging surface. The other part of the light is reflected by the reflector sheet 3 and continues to shine on the first lens body 401. The light refracted through the aberration-free imaging zone forms a clear image on the target imaging surface.

[0046] The aspherical surfaces of the first lens body 401 and the second lens body 402 of the convex lens 4 can be defined using a rotationally symmetric aspherical formula. Aspherical surfaces allow for higher and more concentrated light intensity. This formula is the standard form describing the surface sagitta (Z) of an aspherical lens; it is complete and universal, sufficient for those skilled in the art to reproduce and implement in any optical design software.

[0047]

[0048] in:

[0049] Z: Sagitta of the surface along the optical axis (unit: mm);

[0050] r: Radial coordinate, i.e., the vertical distance from the optical axis (unit: mm);

[0051] c: curvature of the vertex of the surface, c=1 / R, where R is the radius of curvature of the vertex (unit: mm⁻¹);

[0052] k: Conic constant;

[0053] A4, A6, A8, ...: Higher-order aspherical coefficients used to finely correct the shape of curved surfaces to eliminate aberrations or introduce specific aberrations.

[0054] Specific design data in conjunction with the embodiments of this application (such as...) Figure 10 The parameters of the embodiment shown are as follows:

[0055] 1) First lens body 401 (aberration-free imaging area, corresponding to...) Figure 10 Examples of aspherical design parameters (for "real focal lens") are shown in the table below:

[0056]

[0057] 2) Second lens body 402 (controllable aberration region, corresponding to...) Figure 10 Examples of aspherical design parameters (under the "virtual focal lens") are shown in the table below:

[0058]

[0059] The coefficient values ​​of the first lens body 401 and the second lens mentioned above are a set obtained by optical software (such as...). Figure 10 (As shown) Optimized example values. It should be emphasized that the specific parameters provided in the embodiments of the present invention (radius of curvature of the first lens body 401 15.0 mm, radius of curvature of the second lens body 402 18.5 mm, and corresponding aspherical coefficients, etc.) are a set of example values ​​optimized under typical application conditions. When implementing the present invention, those skilled in the art, based on the "partitioned lens-image coverage" architecture of this application, can appropriately adjust and optimize the above parameters according to specific system variables such as the actual selected optical materials (e.g., PMMA refractive index n_d≈1.49, PC refractive index n_d≈1.58, etc.), the size of the light source 2, and the distance to the target imaging surface. This parameter optimization process can be completed through conventional optical design software (e.g., Zemax, LightTools, etc.) and standard image quality evaluation methods (e.g., dot plots, MTF curves), which is a conventional design implementation after mastering the core concept of the present invention and will not affect the inventiveness and feasibility of the present invention.

[0060] The working principle and optical path of the blue light-eliminating composite lens system in this embodiment are as follows:

[0061] 1) Light rays are intercepted by reflector 3 and then incident on the second lens 402 (blurred light path): The light rays emitted by the light source 2, after being reflected by reflector 1, propagate directly towards the light outlet and reach the position of reflector 3. Of this portion of the light ray, the portion below the intercepted ray is blocked and reflected by reflector 3, while the portion above the intercepted ray passes through and is incident on the second lens 402. Figure 7 As shown. After these rays are refracted by the controllable aberration zone of the second lens 402, they form a uniform blurred spot (i.e., a blurred image, a defocused image) on the target road surface. Figure 6 As shown, the light spot in the image is blurred and out of focus. According to the principle of dispersion, the blue border line is located at the top and the yellow border line is located at the bottom. The blue border line at the top is blurred and becomes darker, reducing the visual impact, while the yellow area at the bottom is evenly distributed.

[0062] 2) Light rays reflected by reflector 3 are directed towards the first lens 401 (clear light path): Light rays emitted from light source 2, after being reflected by reflector 1, propagate directly towards the light outlet and reach the position of reflector 3. Of this portion of light, the portion below the cutoff line is reflected by reflector 3. This reflected light propagates upwards and enters the first lens 401, such as... Figure 9 As shown ( Figure 9 The light rays entering the second lens 402 are artificially truncated. After refraction through the aberration-free imaging area of ​​the first lens 401, these light rays are precisely converged, projecting onto the target road surface in front to form an illumination spot with a clear boundary (i.e., a clear image, a sharp-focus image). Figure 8 As shown, the light spot in the figure is clear and in focus. According to the principle of dispersion, and since the first lens body 401 and the second lens body 402 are two similar symmetrical but opposite curved surfaces, the yellow rim line at the top of the figure is clear (because it is cut off by the light cut-off line of the reflector 3, the yellow rim line is particularly clear and bright). Conversely, the light blue area at the bottom is in a dispersed state and has lower brightness.

[0063] 3) Image Shift and Coverage: Optical design software is used to optimize the curvature and position of the first lens 401 and the optical path of the entire system. This ensures that the clear image formed by the first lens 401 on the target imaging surface has a predetermined upward shift in the vertical direction relative to the blurred image formed by the second lens 402. This shift is achieved if the emission angle of the first lens 401 is greater than that of the second lens 402. Preferably, the shift in emission angle is 0.1-0.3 degrees. This shift is precisely calculated, causing the upper edge of the clear image to move upwards (i.e.,...). Figure 8 The clear image is shifted upwards by a preset resolution (i.e., the blue border area originally generated by the second lens 402 and located at the top of the blurred image is completely covered), such as... Figure 3 As shown, Figure 3 The state where a blurred image is covered by a clear image (merged state) Figure 15The diagram illustrates the separation of the blurred and sharp images. In the actual imaging and merging process, the sharp image is offset upwards by a small distance compared to the blurred image (to completely cover the blue border). The upper part of the illuminated area is sharp and clear yellow-white light, while the lower part is uniform and soft light, with no blue border in the transition area. Specifically, after the sharp image is offset upwards, its sharp yellow boundary precisely covers and replaces the blue border at the top of the blurred image, thus eliminating blue light. Under the "partitioned lens-image coverage" core architecture described in this invention, the adjustment of the curvature of the first lens body 401 to achieve the above offset is a task that can be completed by those skilled in the art based on the basic principles of optical design and conventional design methods (such as using optical design software for parameter optimization). This adjustment does not involve inventive effort.

[0064] The complete and clear optical explanation chain of this embodiment is as follows: different surface curvature (physical design) — different changes in refraction angle (Snell's law) — different angles of emitted light rays (geometric optics) — different positions of image plane landing points (light propagation) — different focal length performance (imaging formula) — clear image covering the boundary of blurry image (final effect).

[0065] Those skilled in the art will understand that the above embodiments are for illustrative purposes and describe in detail the preferred embodiments of the present invention. Based on the core architecture of "using a partitioned lens to cover the boundary of a blurred image with a clear image to eliminate blue light" described in the present invention, parameters such as the curvature of the reflector cup 1, the power of the light source 2, and the absolute size of the lens can be selected, adjusted, or optimized according to specific application scenarios (such as different vehicle space and light distribution regulations) to achieve the optical effect desired by the present invention. This is a conventional design work that those skilled in the art can complete under the guidance of the core architecture described above, without the need for excessive experimentation. The reference numerals in the drawings are only used to illustrate the correspondence, and auxiliary structures not shown (such as brackets and heat sinks) can adopt forms known in the art.

[0066] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the inventive concept, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A composite lens system capable of eliminating blue light, comprising a reflector cup, a light source, a reflector sheet, and a convex lens, wherein the reflector cup includes an entrance opening and an exit opening, the inner wall of the reflector cup is an arc-shaped reflective surface, the reflector sheet and the convex lens are sequentially disposed in front of the exit opening, and the reflector sheet is disposed between the reflector cup and the convex lens, the side of the reflector sheet opposite to the exit opening is a planar reflective surface, the edge of the reflector sheet near the convex lens is a cutoff line, the light source is disposed in the entrance opening of the reflector cup, and the illumination direction of the light source is towards the entrance opening of the reflector cup, characterized in that: The convex lens includes an integrally formed first lens body and a second lens body, which are arranged side by side, one above the other, to form the convex lens. The first lens body and the second lens body have different focal lengths, and the focal length of the first lens body is smaller than that of the second lens body. The first lens body forms an aberration-free imaging area through a first curved surface design, which is used to form a clear image on the target imaging surface. The second lens body forms a controllable aberration area through a second curved surface design, which is used to form a blurred image with a preset blur degree on the target imaging surface. Both the first curved surface design and the second curved surface design adopt an aspherical design. After the light emitted by the light source is reflected by the reflector, part of the light is cut off by the reflector and continues to the second lens. The light refracted by the controllable aberration zone forms a blurred image on the target imaging surface. The other part of the light is reflected by the reflector and continues to the first lens. The light refracted by the aberration-free imaging zone forms a clear image on the target imaging surface. The clear image is offset relative to the blurred image in a preset direction. The clear image is offset along the boundary area where the blurred image is cut off by the punctured light to a point beyond the boundary area. The clear image completely covers the boundary area where the blurred image is cut off by the punctured light through the offset.

2. The composite lens system for eliminating blue light according to claim 1, characterized in that: A step is formed on the boundary line connecting the first curved surface design and the second curved surface design.

3. The composite lens system for eliminating blue light according to claim 1, characterized in that: The height of the light-receiving surface of the second lens is greater than the height of the light-receiving surface of the first lens.

4. The composite lens system for eliminating blue light according to claim 1, characterized in that: The height of the light-receiving surface of the second lens body accounts for 51%-60% of the total light-receiving surface height.

5. The composite lens system for eliminating blue light according to claim 1, characterized in that: The end face of the convex lens near the reflector is an arc-shaped concave surface.

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