Large-aperture five-piece optical lens for improving light energy utilization

Abstract

The application provides a large-aperture five-piece optical lens with high light energy utilization, which is composed of a first lens, a second lens, a third lens, a fourth lens and a fifth lens along an optical axis from an object side to an image side; the object side of the first lens is provided as a convex surface or a flat surface; the second lens is provided as a convex surface with positive focal power; the third lens is provided as a concave surface with negative focal power; the fourth lens is provided as a convex surface with positive focal power and is a glass lens; the fifth lens is provided as a meniscus glass lens with positive focal power and a convex object side; and the following conditions are met: |f1| / EFL>10; f4<f5; |f123| / EFL>3.4; 2>f2 / f4>0.5; |f3|<f2; |f1| / |f3|>17. The application achieves high energy utilization, good color performance and suitable imaging quality.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, and in particular to a large-aperture five-element optical lens that improves light energy utilization. Background Technology

[0002] Traditional automotive low beam headlight systems that use the projection principle typically consist of a light source, a light-collecting element, a cutoff line structure, and a convex lens, primarily to achieve basic lighting functions.

[0003] In recent years, with the development of automotive lighting technology, pixel headlights (also known as matrix headlights) have emerged. This technology uses the principle of projection imaging, which not only has traditional lighting functions but also enables adaptive high beam (ADB) functionality. It can also project weather information, road navigation signs, or other symbols onto the ground outside the vehicle, serving as a "light language" for pedestrian and vehicle identification. The core components of a pixel headlight optical system include luminescent pixels (such as Mini LEDs, MicroLEDs, LCD screens, LCOS, or illuminated DMD digital micromirrors) and projection optical lenses.

[0004] Pixel headlights serve a dual function of illumination and imaging. The core requirements differ significantly depending on the number of pixels in the light source and the application conditions (such as different field of view).

[0005] For lower-pixel light sources, automotive lighting applications focus more on improving center luminous intensity and energy efficiency, while meeting basic image quality requirements (especially low chromatic aberration). Higher energy efficiency helps reduce the need for additional lighting auxiliary modules, thereby lowering the overall system cost.

[0006] Considering the special characteristics of automotive applications (operating temperature range -45°C to +85°C), the optical system also needs to have good thermal and vibration reliability, as well as meet the requirements of lightweight and low cost to enhance market competitiveness.

[0007] However, existing lens designs generally suffer from the following shortcomings: either insufficient energy utilization, the use of expensive optical glass materials, or poor thermal stability.

[0008] In imaging lenses, key energy-related parameters include numerical aperture, aperture size and focal length, and f-number (aperture value / f-number), and these parameters are closely related. Regarding numerical aperture, the vast majority of current lenses have a numerical aperture of less than 0.5, corresponding to an f-number greater than 1.0. For example, Chinese patent announcement CN223090468U discloses a large-aperture five-element projection lens and a vehicle lamp using the same, comprising: a first lens, a first aperture, a second lens, a third lens, a fourth lens, a second aperture, a fifth lens, and a DMD arranged sequentially along the optical axis from the image side to the object side; wherein the focal length f1 of the first lens and the focal length EFL of the large-aperture five-element projection lens satisfy the condition: 1 < |f1 / EFL| < 2; the focal length f2 of the second lens and the focal length EFL of the large-aperture five-element projection lens satisfy the condition: 0.5 < |f2 / EFL| < 1.5; and the focal length f3 of the third lens and the focal length EFL of the large-aperture five-element projection lens satisfy the condition: 1.7 < |f3 / EFL| < 2; the focal length f4 of the fourth lens and the focal length EFL of the large-aperture five-element projection lens satisfy the condition: 1.3 < |f4 / EFL| < 1. 0.8; The focal length f5 of the fifth lens and the focal length EFL of the large-aperture five-element projection lens satisfy the condition: 0.5 < |f5 / EFL| < 1.2. The drawback of this existing technology is that in pixel headlight applications with extremely high energy utilization requirements, the numerical aperture of the existing lens is relatively low, which means insufficient light energy utilization and difficulty in meeting the needs of efficient projection.

[0009] In summary, pixel headlight applications require an optical system with high energy efficiency (i.e., a large numerical aperture) that maintains relatively stable performance under different operating temperatures. This invention aims to solve this technical problem, achieving the design goals of high energy efficiency, good color performance, suitable image quality, and wide temperature range stability. Summary of the Invention

[0010] This invention provides a large-aperture five-element optical lens that achieves high energy efficiency, good color performance, suitable imaging quality, and wide temperature range stability.

[0011] This projection imaging lens employs a reverse optical design, defining the actual projection screen as the object plane and the emitting surface of the actual light source as the image plane. Based on the principle of optical path reversibility, this design is physically equivalent to tracing the light path from the screen to the light source. The advantage of the reverse design is that it naturally constrains the optical path system into a telecentric optical path on the image side, making the principal ray emitted approximately parallel to the optical axis on the image side (i.e., the actual light source side). This structure allows the light beams emitted by each pixel of the actual light source to enter the lens almost perpendicularly, thereby effectively improving the utilization rate of light energy and the uniformity of illumination of the projected image, and shortening the back-working distance. This patent specification follows this reverse design convention, setting all optical parameters and structural descriptions with the projection surface as the object and the light source surface as the image.

[0012] This invention provides a large-aperture five-element optical lens that improves light energy utilization. It consists of a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in sequence along the optical axis from the object side to the image side.

[0013] The object-side surface of the first lens is either convex or planar; and the image-side surface of the lens is aspherical.

[0014] The second lens is configured to have positive optical power and both outer surfaces are convex.

[0015] The third lens is configured to have negative optical power and a concave image side surface;

[0016] The fourth lens is configured to have positive optical power and both outer surfaces are convex, and it is configured as a glass lens.

[0017] The fifth lens has positive optical power and is configured as a meniscus glass lens with a convex object side.

[0018] The focal length f1 of the first lens and the effective focal length EFL of the large-aperture five-element optical lens satisfy the condition: |f1| / EFL>10;

[0019] The focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy the following condition:

[0020] f4 <f5;

[0021] The overall effective focal length f123 of the first lens, the second lens, and the third lens, and the effective focal length EFL of the large-aperture five-element optical lens satisfy the following condition:

[0022] |f123| / EFL>3.4;

[0023] The focal length f2 of the second lens and the focal length f4 of the fourth lens satisfy the following condition:

[0024] 2>f2 / f4>0.5;

[0025] The focal length f3 of the third lens and the focal length f2 of the second lens satisfy the following condition:

[0026] |f3| <f2;

[0027] The focal length f1 of the first lens and the focal length f3 of the third lens satisfy the following condition:

[0028] |f1| / |f3|>17.

[0029] Preferably, the Abbe number of the third lens is less than 30; the Abbe numbers of the second lens, the fourth lens, and the fifth lens are greater than 30.

[0030] Preferably, the half-image height h and the effective focal length EFL of the large-aperture five-element optical lens satisfy the condition: arctan(h / EFL) < 30°.

[0031] Preferably, the physical light-transmitting size Dstop of the aperture and the effective focal length EFL of the large-aperture five-element optical lens satisfy the condition: Dstop / EFL>1.5.

[0032] Preferably, the effective maximum aperture D1 of the first lens and the effective maximum aperture D2 of the second lens satisfy the condition: 0.8 <D1 / D2<1.15;

[0033] The effective maximum aperture D2 of the second lens and the effective maximum aperture D3 of the third lens satisfy the condition: 1.4>D2 / D3>0.9;

[0034] The effective maximum aperture D3 of the third lens and the effective maximum aperture D4 of the fourth lens satisfy the condition: 1.2>D3 / D4>0.8;

[0035] The effective maximum aperture D1 of the first lens and the effective maximum aperture D5 of the fifth lens satisfy the condition: D1 / D5>1.4;

[0036] The effective maximum aperture D5 of the fifth lens and the half-image height h of the large-aperture five-element optical lens satisfy the condition: D5>2*h.

[0037] Preferably, in a large-aperture five-element optical lens, the center thickness of the first lens is T0, the thickness at half the aperture of the first lens is T_0.5, and the aperture size of its image-side surface is D_s2, satisfying the condition: (T_0.5-T0) / D_s2<0.02;

[0038] The thickness T_1 at the maximum effective aperture of the first lens, the thickness T_0.5 at half the aperture, and the center thickness T0 of the first lens satisfy the condition: (T_1-T_0.5) / (T_0.5-T0)>9.

[0039] Preferably, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy the condition: |R3|>|R4.

[0040] Preferably, the total system length OAL and the effective focal length EFL of the large-aperture five-element optical lens satisfy the condition: OAL / EFL<3.5.

[0041] Preferably, in the first to the fifth lens, at least one surface of each lens is aspherical, or all surfaces of each lens are aspherical.

[0042] Preferably, the object-side surface of the third lens is convex.

[0043] Preferably, the object-side surface of the third lens is concave.

[0044] Preferably, the first lens is configured as a positive lens.

[0045] Preferably, the first lens is configured as a negative lens.

[0046] Preferably, the third lens and the fourth lens are cemented lens structures.

[0047] Preferably, the aperture stop is located between the second lens and the third lens.

[0048] The beneficial effects of this invention are as follows:

[0049] 1. The object-side surface of the first lens is convex or flat, and the image-side surface is aspherical, which is more aesthetically pleasing in automotive headlights and less prone to dust accumulation in the center due to the concave surface; the second lens is configured with positive optical power and both outer surfaces are convex; the third lens is configured with negative optical power and the image-side surface is concave; the fourth lens is configured with positive optical power and both outer surfaces are convex; and the fifth lens has positive optical power, which helps to distribute local optical power while correcting chromatic aberration and field curvature, thus preventing aberrations from accumulating on the same lens; the fifth lens is a meniscus glass lens, which helps to collect light from a wider angle of the light source, thereby increasing the numerical aperture and improving energy utilization, making the headlight brighter;

[0050] If |f1| / EFL>10, the optical power of the first lens is limited so that it does not contribute to the main optical power. Its main function is to correct aberrations caused by large aperture, such as spherical aberration.

[0051] Satisfy the constraint of f4<f5, so that the focusing effect of the fourth lens in the system is stronger than that of the fifth lens;

[0052] Satisfy |f123| / EFL>3.4, so that the optical power of the first three lenses, namely the first lens, the second lens and the third lens, is weaker than the optical power of the last two lenses; in addition, the "combined focal length f123 of the first lens to the third lens" in the present invention refers to the combined focal length calculated based on the respective optical powers of the first lens, the second lens and the third lens in their respective non-cemented states. Even if the third lens is in a cemented combination relationship with the fourth lens in the physical structure, it is still regarded as an independent lens when calculating f123, rather than being calculated as a part of the cemented lens group;

[0053] Satisfy 2>f2 / f4>0.5, this conditional expression is used to limit the ratio of the optical power of the second lens to the fourth lens within a reasonable range, so as to avoid an excessively large disparity between the optical powers of the two, thereby ensuring that the second lens and the fourth lens, as the lenses mainly bearing the optical power in the system, can share the optical power in a coordinated manner, so as to achieve the purposes of balancing aberrations and shortening the total length of the system;

[0054] Satisfy |f3|<f2, the third lens is a negative lens, which is provided with a relatively large optical power for eliminating chromatic aberration;

[0055] Satisfy |f1| / |f3|>17, so that the optical power of the first lens is much weaker than that of the third lens, thereby suppressing the contribution of the first lens to the primary aberration of the system in the paraxial region, and further reducing its disturbance amplitude to the overall imaging quality.

[0056] 2. The Abbe number of the third lens is less than 30, and the Abbe numbers of the second lens, the fourth lens and the fifth lens are greater than 30. By setting the third lens (negative lens) as a high-dispersion material (small Abbe number) and setting the remaining positive lenses (the second, fourth, and fifth lenses) as low-dispersion materials (large Abbe number), the dispersion complementary effect of the positive and negative lenses is utilized to significantly improve the system in terms of achromatism, and effectively reduce axial chromatic aberration and lateral chromatic aberration.

[0057] 3. Satisfy arctan(h / EFL)<30°, so that within the designed full field of view of the system, the aberrations of each field of view can be controlled within an acceptable tolerance range, avoiding the sharp deterioration of the aberration of the marginal field of view caused by an excessively large field angle.

[0058] 4. Satisfy Dstop / EFL>1.5, which is used to control the light energy and is beneficial to improving the energy utilization rate of the optical system. The larger the value, the higher the system efficiency.

[0059] 5. Meets 0.8 <D1 / D2<1.15;1.4> D2 / D3>0.9; 1.2>D3 / D4>0.8; D1 / D5>1.4; D5>2h. These aperture limits indicate that the settings of the first four lens apertures are used to limit the lens to have a relatively uniform aperture, which is beneficial to improve energy utilization within a certain maximum physical aperture size.

[0060] Among them, D5>2h is satisfied because the fifth lens is located close to the image plane in the optical path. The incident angle of the principal ray it bears is small, and it mainly plays the role of field lens correction rather than large-angle convergence. Therefore, its aperture is not restricted by large-angle incident. Under the premise of meeting the mechanical installation size requirements and fully considering the safety gap required for the heat expansion of the light source, D5 is set to be greater than the full image height (2h). This design not only ensures that the incident height of the fifth lens is sufficient to cover the entire image plane, but also makes its aperture smaller than that of the first lens, which bears the task of large-angle convergence. This is conducive to balancing the manufacturing difficulty and structural compactness of the lens.

[0061] 6. The first lens conforms to the thickness relationship of (T_0.5-T0) / D_s2<0.02 and (T_1-T_0.5) / (T_0.5-T0)>9. The condition (T_0.5-T0) / D_s2<0.02 ensures that the thickness difference from the paraxial region to half the aperture is minimal, so the optical power of the first lens in the paraxial region approaches zero, the surface shape change within the half aperture is gradual, and the lens thickness is almost the same as the center. The condition (T_1-T_0.5) / (T_0.5-T0)>9 causes the thickness to increase sharply from half the aperture to the edge, and the surface curvature increases rapidly. This thickness distribution gives the first lens a gradual characteristic from weak optical power at the center to strong optical power at the edge, which can apply differentiated refraction to light rays of different apertures to correct on-axis aberrations dominated by spherical aberration.

[0062] 7. The radius of curvature of the second lens conforms to |R3|>|R4, and the object side surface R3 of the lens is flat, which is more conducive to reducing aberrations.

[0063] 8. Meeting the OAL / EFL < 3.5 standard has several advantages. First, it reduces overall size. The shorter axial dimension directly reduces the overall envelope volume of the lens module, making it better suited for space-sensitive electronic devices. Second, it reduces material costs. The compact optical structure typically reduces the diameter of each lens element, as well as the axial height of injection-molded parts such as lens barrels and spacers, directly reducing the volume of optical plastic or glass blanks used, thereby effectively reducing the material cost per lens unit. Third, it improves assembly efficiency and yield. The shorter system length effectively reduces tolerance sensitivity caused by the accumulation of lens spacing errors, which is beneficial for improving the production yield and batch consistency of lens assembly.

[0064] 9. Although the first lens makes the edge thickness significantly greater than the center thickness through the above thickness condition formula, thus exhibiting a shape similar to a negative lens, its positive or negative lens properties are not determined by the edge thickness, but are independently controlled by the local curvature of the paraxial region. Since the optical power of the paraxial region is extremely weak, the curvature of this region can be finely adjusted to make it exhibit positive or negative optical power. Therefore, the first lens can be either a positive lens or a negative lens.

[0065] 10. The third and fourth lenses are cemented lens structures, and both are spherical glass lenses. Compared with discrete lenses, this cemented structure has the following engineering advantages: First, the Fresnel reflection loss at the interface is reduced from two air interfaces to one adhesive layer interface, thereby improving the light energy utilization rate; second, by matching glass materials with different dispersion coefficients, chromatic aberration can be corrected more effectively; third, the cemented component eliminates the spacer between the two lenses, which helps to simplify the assembly process and reduce tolerance sensitivity. Attached Figure Description

[0066] Figure 1 This is a schematic diagram of the structure of the first embodiment.

[0067] Figure 2 This is an MTF view of the first embodiment.

[0068] Figure 3 This is the axial chromatic aberration / color shift curve of the first embodiment.

[0069] Figure 4 This is a schematic diagram of the lateral (magnification) color difference results of the first embodiment. Figure 1 .

[0070] Figure 5 This is a schematic diagram of the lateral (magnification) color difference results of the first embodiment. Figure 2 .

[0071] Figure 6 This is a schematic diagram of the second embodiment.

[0072] Figure 7 This is an MTF view of the second embodiment.

[0073] Figure 8 This is a schematic diagram of the lateral (magnification) color difference results of the second embodiment.

[0074] The attached figures are labeled as follows: first lens 11, second lens 12, aperture 10, third lens 13, fourth lens 14, and fifth lens 15. Detailed Implementation

[0075] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.

[0076] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0077] Reference Figures 1 to 5 As shown in the first embodiment, this embodiment provides a large-aperture five-element optical lens that improves light energy utilization. Along the optical axis from the object side to the image side, it is composed of a first lens 11, a second lens 12, an aperture 10, a third lens 13, a fourth lens 14, and a fifth lens 15. In this embodiment, the object side of the first lens 11 is a plane, the image side of the fifth lens 15 is a concave surface, and the third lens 13 and the fourth lens 14 are set separately.

[0078] The relevant parameters of each lens in this embodiment are shown in Table 1-1, and the parameters of each aspherical lens in this embodiment are shown in Table 1-2.

[0079]

[0080] The expression for an aspherical surface is as follows:

[0081]

[0082] Where z is the sag of the aspherical surface at position r; c is the paraxial curvature of the aspherical surface, c=1 / R, (i.e., the paraxial curvature c is the reciprocal of the surface curvature radius R); k is the conic coefficient; A,B,...,J are coefficients of higher-order terms.

[0083]

[0084] The other system parameters for this design in this embodiment are:

[0085]

[0086] The following relation is satisfied in this embodiment:

[0087]

[0088] Reference Figures 6 to 8As shown in the second embodiment, this embodiment provides a large-aperture five-element optical lens that improves light energy utilization. Along the optical axis from the object side to the image side, it is composed of a first lens 11, a second lens 12, an aperture 10, a third lens 13, a fourth lens 14, and a fifth lens 15. In this embodiment, the object side of the first lens 11 is convex, the image side of the fifth lens 15 is flat, and the third lens 13 and the fourth lens 14 are cemented together.

[0089] The relevant parameters of each lens in this embodiment are shown in Table 2-1, and the parameters of each aspherical lens in this embodiment are shown in Table 2-2.

[0090]

[0091] The expression for an aspherical surface is as follows:

[0092]

[0093] Where z is the sag of the aspherical surface at position r; c is the paraxial curvature of the aspherical surface, c=1 / R, (i.e., the paraxial curvature c is the reciprocal of the surface curvature radius R); k is the conic coefficient; A,B,...,J are coefficients of higher-order terms.

[0094]

[0095] The other system parameters for this design in this embodiment are:

[0096]

[0097] The following relation is satisfied in this embodiment:

[0098]

[0099] The embodiments described above merely illustrate the optimal implementation of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A large-aperture five-element optical lens for improving light energy utilization, comprising, along the optical axis from the object side to the image side, a first lens (11), a second lens (12), a third lens (13), a fourth lens (14), and a fifth lens (15); characterized in that, The object side of the first lens (11) is either convex or planar; and the image side of the lens is aspherical. The second lens (12) is configured to have positive optical power and both outer surfaces are convex. The third lens (13) is configured to have negative optical power and a concave image side; The fourth lens (14) is configured to have positive optical power and both outer surfaces are convex, and it is configured as a glass lens; The fifth lens (15) has positive optical power and is configured as a meniscus glass lens with a convex object side. The focal length f1 of the first lens (11) and the effective focal length EFL of the large aperture five-element optical lens satisfy the condition: |f1| / EFL>10; The focal length f4 of the fourth lens (14) and the focal length f5 of the fifth lens (15) satisfy the following condition: f4 <f5; The overall effective focal length f123 of the first lens (11), the second lens (12), and the third lens (13) and the effective focal length EFL of the large-aperture five-element optical lens satisfy the following condition: |f123| / EFL>3.4; The focal length f2 of the second lens (12) and the focal length f4 of the fourth lens (14) satisfy the following condition: 2>f2 / f4>0.5; The focal length f3 of the third lens (13) and the focal length f2 of the second lens (12) satisfy the following condition: |f3| <f2; The focal length f1 of the first lens (11) and the focal length f3 of the third lens (13) satisfy the following condition: |f1| / |f3|>17.

2. The large-aperture five-element optical lens for improving light energy utilization according to claim 1, characterized in that, The Abbe number of the third lens (13) is less than 30; the Abbe numbers of the second lens (12), the fourth lens (14), and the fifth lens (15) are greater than 30.

3. The large-aperture five-element optical lens for improving light energy utilization according to claim 1, characterized in that, The half-image height h and the effective focal length EFL of the large-aperture five-element optical lens satisfy the condition: arctan(h / EFL) < 30°.

4. A large-aperture five-element optical lens for improving light energy utilization according to claim 1, characterized in that, Its physical light-transmitting size Dstop and the effective focal length EFL of the large-aperture five-element optical lens satisfy the condition: Dstop / EFL>1.

5.

5. A large-aperture five-element optical lens for improving light energy utilization according to claim 1, characterized in that, The effective maximum aperture D1 of the first lens (11) and the effective maximum aperture D2 of the second lens (12) satisfy the condition: 0.8 <D1 / D2<1.15; The effective maximum aperture D2 of the second lens (12) and the effective maximum aperture D3 of the third lens (13) satisfy the condition: 1.4>D2 / D3>0.9; The effective maximum aperture D3 of the third lens (13) and the effective maximum aperture D4 of the fourth lens (14) satisfy the condition: 1.2>D3 / D4>0.8; The effective maximum aperture D1 of the first lens (11) and the effective maximum aperture D5 of the fifth lens (15) satisfy the condition: D1 / D5>1.4; The effective maximum aperture D5 of the fifth lens (15) and the half-image height h of the large-aperture five-element optical lens satisfy the condition: D5>2*h.

6. A large-aperture five-element optical lens for improving light energy utilization according to claim 1, characterized in that, The center thickness of the first lens (11) of the large aperture five-element optical lens is T0, the thickness at half the aperture of the first lens (11) is T_0.5, and the aperture size of its image side is D_s2, which satisfies the condition: (T_0.5-T0) / D_s2<0.02; The thickness T_1 at the maximum effective aperture of the first lens (11), the thickness T_0.5 at half the aperture, and the center thickness T0 of the first lens (11) satisfy the condition: (T_1-T_0.5) / (T_0.5-T0)>9.

7. A large-aperture five-element optical lens for improving light energy utilization according to claim 1, characterized in that, The curvature radius R3 of the object side of the second lens (12) and the curvature radius R4 of the image side of the second lens (12) satisfy the condition: |R3|>|R4.

8. A large-aperture five-element optical lens for improving light energy utilization according to claim 1, characterized in that, The total system length (OAL) and effective focal length (EFL) of a large-aperture five-element optical lens satisfy the condition: OAL / EFL < 3.

5.

9. A large-aperture five-element optical lens for improving light energy utilization according to claim 1, characterized in that, In the first lens (11) to the fifth lens (15), at least one surface of each lens is aspherical, or all surfaces of each lens are aspherical.

10. A large-aperture five-element optical lens for improving light energy utilization according to any one of claims 1-9, characterized in that, The object side of the third lens (13) is convex.

11. A large-aperture five-element optical lens for improving light energy utilization according to any one of claims 1-9, characterized in that, The object side of the third lens (13) is concave.

12. A large-aperture five-element optical lens for improving light energy utilization according to any one of claims 1-9, characterized in that, The first lens (11) is configured as a positive lens.

13. A large-aperture five-element optical lens for improving light energy utilization according to any one of claims 1-9, characterized in that, The first lens (11) is configured as a negative lens.

14. A large-aperture five-element optical lens for improving light energy utilization according to any one of claims 1-9, characterized in that, The third lens (13) and the fourth lens (14) are cemented lens structures.

15. A large-aperture five-element optical lens for improving light energy utilization according to any one of claims 1-9, characterized in that, The aperture stop (10) is located between the second lens (12) and the third lens (13).

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