Glass-plastic hybrid optical system

Abstract

This invention relates to a glass-plastic hybrid optical system, comprising: a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, an aperture stop, a fourth lens, a fifth lens, and a sixth lens with positive optical power, arranged sequentially along the optical axis from the object side to the image side, wherein the optical powers of the fifth and sixth lenses are opposite; the first lens is a convex-concave lens, the paraxial region of the image side of the second lens is concave, the third lens is a paraxial region concave-convex lens or a paraxial region convex-concave lens, the paraxial regions of the image sides of the fourth and sixth lenses are both convex, and the paraxial region of the object side of the fifth lens is convex; the combined focal length Fa of the lens on the object side of the aperture stop, the combined focal length Fb of the lens on the image side of the aperture stop, and the effective focal length F of the glass-plastic hybrid optical system satisfy: 1.3≤|Fa / F|≤35; 1.4≤|Fb / F|≤3.0. It combines the advantages of small size, large angle, large aperture, low cost, and non-defocusing within a temperature range of -20℃ to 60℃.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical systems, and in particular to a small-volume, large-angle and large-aperture glass-plastic hybrid optical system. BACKGROUND

[0002] Optical lenses are widely used in security monitoring, unmanned aerial vehicle shooting, mobile phone shooting, machine vision and other fields. With the progress of science and technology and the development of economy, unmanned aerial vehicles are gradually applied to people's daily life. Therefore, people have gradually made further requirements for optical lenses applied to unmanned aerial vehicle shooting.

[0003] For unmanned aerial vehicles, the first requirement is to obtain a wider field of view. This requires the optical lens to have a larger field of view. Secondly, unmanned aerial vehicles mainly work in outdoor environments, so the optical lens needs to ensure clear imaging in different temperature environments. At the same time, outdoor work is greatly affected by weather and ambient light. In order to enable the unmanned aerial vehicle to adapt to the light changes of the external environment, such optical lenses also need to obtain a larger light flux. The lenses that can generally meet the above performance requirements on the market generally have the problems of large size and high cost. SUMMARY

[0004] In order to overcome the defects of the prior art, the purpose of the present application is to provide a glass-plastic hybrid optical system which has the advantages of small size, large angle, large aperture, low cost and no defocus in the temperature range of-20℃ to 60℃.

[0005] In order to achieve the above-mentioned purpose of the application, the present application provides a glass-plastic hybrid optical system, comprising: a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a diaphragm, a fourth lens with positive optical power, a fifth lens and a sixth lens arranged in order along the optical axis from the object side to the image side, the optical power of the fifth lens and the sixth lens being opposite;

[0006] The first lens is a convex-concave lens, the shape of the paraxial region of the image side surface of the second lens is concave, the third lens is a paraxial region concave-convex lens or a paraxial region convex-concave lens, the shape of the paraxial region of the image side surface of the fourth lens and the sixth lens is convex, and the shape of the paraxial region of the object side surface of the fifth lens is convex.

[0007] According to one aspect of the present application, the first lens is a glass spherical lens.

[0008] The second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all plastic aspherical lenses.

[0009] According to one aspect of the present invention, the focal lengths F1 of the first lens, F2 of the second lens, F3 of the third lens, F4 of the fourth lens, F5 of the fifth lens, and F6 of the sixth lens, respectively, satisfy the following conditional expression with the effective focal length F of the glass-plastic hybrid optical system:

[0010] -7.0≤F1 / F≤-4.1;

[0011] -4.9≤F² / F≤-1.5;

[0012] 3.3≤F3 / F≤10.0;

[0013] 2.0≤F4 / F≤4.5;

[0014] -2.7≤F5 / F≤2.1;

[0015] -3.1≤F6 / F≤2.8.

[0016] According to one aspect of the present invention, the back focal length (BFL) of the glass-plastic hybrid optical system and the total lens length (TTL) of the glass-plastic hybrid optical system satisfy the following condition: 0.1 ≤ BFL / TTL ≤ 0.3.

[0017] According to one aspect of the present invention, the focal length F5 of the fifth lens, the focal length F6 of the sixth lens, and the effective focal length F of the glass-plastic hybrid optical system satisfy the following condition: -1.6≤(F5 / F6) / F≤-0.5.

[0018] According to one aspect of the present invention, the effective focal length F of the glass-plastic hybrid optical system and the total lens length TTL of the glass-plastic hybrid optical system satisfy the following condition: 8.8≤TTL / F≤13.3.

[0019] According to one aspect of the invention, the distance D456 from the object side of the fourth lens to the image side of the sixth lens and the total lens length TTL of the glass-plastic hybrid optical system satisfy the following condition: 0.1≤D456 / TTL≤0.6.

[0020] According to one aspect of the invention, the air gap D45 between the fourth lens and the fifth lens and the total lens length TTL of the glass-plastic hybrid optical system satisfy the following condition: 0.001≤D45 / TTL≤0.08.

[0021] According to one aspect of the present invention, the entrance pupil diameter ENPD of the glass-plastic hybrid optical system and the total lens length TTL of the glass-plastic hybrid optical system satisfy the following condition: 0.02≤ENPD / TTL≤0.09.

[0022] According to one aspect of the present invention, the distance D56 between the image side of the fifth lens and the object side of the sixth lens on the optical axis satisfies the following condition F with respect to the effective focal length F of the glass-plastic hybrid optical system: 0≤D56 / F≤0.4.

[0023] According to one aspect of the invention, the central radius of curvature R1 of the object side of the first lens and the central radius of curvature R2 of the image side of the first lens satisfy the following condition: 2.2≤R1 / R2≤3.8.

[0024] According to one aspect of the present invention, the total lens length (TTL) of the glass-plastic hybrid optical system, the image height (H) corresponding to the maximum field of view (FOV) of the glass-plastic hybrid optical system, and the maximum field of view (FOV) of the glass-plastic hybrid optical system satisfy the following condition: 0.01≤TTL / H / FOV≤0.03.

[0025] According to one aspect of the invention, the combined focal length Fa of the lens on the object side of the aperture and the effective focal length F of the glass-plastic hybrid optical system satisfy the following condition: 1.3≤|Fa / F|≤35.

[0026] According to one aspect of the invention, the combined focal length Fb of the lens on the image side of the aperture and the effective focal length F of the glass-plastic hybrid optical system satisfy the following condition: 1.4 ≤ |Fb / F| ≤ 3.0.

[0027] According to the present invention, by optimizing the optical structure of the six lenses and the conditions they satisfy, the glass-plastic hybrid optical system combines the advantages of a large angle, a large aperture, a small size, and low cost. It also maintains focus within a temperature range of -20℃ to 60℃, making it suitable for various environments. Furthermore, it can achieve high-definition imaging even under varying ambient light conditions. Specifically, it can achieve a maximum aperture of F0 1.8, a minimum total lens length of 8mm, and an image capture capability with an object-side field of view of 195° to 199°. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0029] Figure 1 This schematic diagram illustrates the structure of the glass-plastic hybrid optical system of Embodiment 1 of the present invention.

[0030] Figure 2 This schematic diagram illustrates the structure of the glass-plastic hybrid optical system of Embodiment 2 of the present invention.

[0031] Figure 3 This schematic diagram illustrates the structure of the glass-plastic hybrid optical system of Embodiment 3 of the present invention.

[0032] Figure 4 The schematic diagram illustrates the structure of the glass-plastic hybrid optical system of Embodiment 4 of the present invention. Detailed Implementation

[0033] The description of the embodiments in this specification should be taken in conjunction with the accompanying drawings, which should form part of the complete specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and may be indicated in a simplified or convenient manner. Furthermore, parts of the various structures in the drawings will be described separately; it is worth noting that elements not shown in the figures or not described in words are in a form known to those skilled in the art.

[0034] The description of the embodiments herein, including any references to directions and orientations, is for ease of description only and should not be construed as limiting the scope of the invention. The following description of preferred embodiments involves combinations of features, which may exist independently or in combination; the invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.

[0035] like Figures 1 to 4 As shown, an embodiment of the present invention provides a glass-plastic hybrid optical system, which, along the optical axis from the object side to the image side, sequentially includes: a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with positive optical power, an aperture stop STO, a fourth lens L4 with positive optical power, and a fifth lens L5 and a sixth lens L6 with opposite optical powers. That is, in some embodiments, if the optical power of the fifth lens L5 is positive, the optical power of the sixth lens L6 is negative; in other embodiments, if the optical power of the fifth lens L5 is negative, the optical power of the sixth lens L6 is positive. The first lens L1 is a convex-concave lens, the paraxial region of the image side of the second lens L2 is concave, the third lens L3 is a paraxial region concave-convex lens or a paraxial region convex-concave lens, the paraxial regions of the image sides of the fourth lens L4 and the sixth lens L6 are both convex, and the paraxial region of the object side of the fifth lens L5 is convex. By optimizing the shape of each lens and rationally allocating the optical power of each lens, the optical system can better receive and transmit light, which helps to obtain a larger field of view and gives it the advantages of a large angle and a large aperture. Specifically, it can achieve a maximum aperture of FNO1.8 and image capture with an object-side field of view of 195° to 199°.

[0036] In this embodiment of the invention, the first lens L1 is a glass spherical lens, while the remaining lenses—the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6—are all plastic aspherical lenses. By using a single glass lens, or a combination of glass and plastic lenses, the system achieves advantages such as small size and low cost, while ensuring that the optical system remains focused within a temperature range of -20℃ to 60℃, making it suitable for various environments.

[0037] In this embodiment of the invention, the focal lengths F1 of the first lens L1, F2 of the second lens L2, F3 of the third lens L3, F4 of the fourth lens L4, F5 of the fifth lens L5, and F6 of the sixth lens L6 satisfy the following conditions with the effective focal length F of the glass-plastic hybrid optical system: -7.0 ≤ F1 / F ≤ -4.1; -4.9 ≤ F2 / F ≤ -1.5; 3.3 ≤ F3 / F ≤ 10.0; 2.0 ≤ F4 / F ≤ 4.5; -2.7 ≤ F5 / F ≤ 2.1; and -3.1 ≤ F6 / F ≤ 2.8. The effective focal length F in this embodiment refers to the focal length of the entire lens group, including the first lens L1 to the sixth lens L6, also known as the total focal length. By reasonably setting the ratio of the focal length of each lens to the effective focal length of the optical system, the performance of the entire optical system can be improved.

[0038] In this embodiment of the invention, the back focal length (BFL) of the glass-plastic hybrid optical system and the total lens length (TTL) of the glass-plastic hybrid optical system satisfy the following condition: 0.1 ≤ BFL / TTL ≤ 0.3. By reasonably controlling the ratio between the back focal length of the optical lens and the total length of the optical lens (i.e., the total length of the optical system), it is beneficial to make the optical system structure compact, reduce the sensitivity of the lens to MTF, improve product yield, reduce production costs, and achieve small size.

[0039] In this embodiment of the invention, the focal length F5 of the fifth lens L5, the focal length F6 of the sixth lens L6, and the effective focal length F of the glass-plastic hybrid optical system satisfy the following condition: -1.6 ≤ (F5 / F6) / F ≤ -0.5. By reasonably setting the ratio of the focal lengths of the fifth lens L5 and the sixth lens L6 to the total focal length of the optical system, it is possible to facilitate a smooth transition of light and effectively correct chromatic aberration.

[0040] In this embodiment of the invention, the effective focal length F of the glass-plastic hybrid optical system and the total lens length TTL of the glass-plastic hybrid optical system satisfy the following condition: 8.8 ≤ TTL / F ≤ 13.3. Optimizing this condition facilitates miniaturization, resulting in a smaller optical system size.

[0041] In this embodiment of the invention, the distance D456 from the object-side surface of the fourth lens L4 to the image-side surface of the sixth lens L6 satisfies the following condition with respect to the total lens length TTL of the glass-plastic hybrid optical system: 0.1 ≤ D456 / TTL ≤ 0.6. This reduces the tolerances of the fourth, fifth, and sixth lenses L6, improves the lens assembly yield, allows the lens CRA to be compatible with multiple sensors, broadens its application prospects, and enhances its market competitiveness.

[0042] In this embodiment of the invention, the air gap D45 between the fourth lens L4 and the fifth lens L5 satisfies the following condition with respect to the total lens length TTL of the glass-plastic hybrid optical system: 0.001 ≤ D45 / TTL ≤ 0.08. By reasonably setting the air gap between the fourth lens L4 and the fifth lens L5, a smoother light transition is achieved, thus improving the image quality of the lens.

[0043] In this embodiment of the invention, the entrance pupil diameter ENPD and the total lens length TTL of the glass-plastic hybrid optical system satisfy the following condition: 0.02≤ENPD / TTL≤0.09. By reasonably setting the ratio between the entrance pupil diameter and the total length of the optical system, a larger relative aperture is ensured, which is beneficial for high-definition imaging in low-light environments.

[0044] In this embodiment of the invention, the distance D56 between the image-side surface of the fifth lens L5 and the object-side surface of the sixth lens L6 on the optical axis satisfies the following condition with respect to the effective focal length F of the glass-plastic hybrid optical system: 0 ≤ D56 / F ≤ 0.4. By reasonably controlling the distance between the fifth lens L5 and the sixth lens L6, more light can pass through the sixth lens L6, improving the system brightness and enabling it to adapt well to changes in the brightness of the external environment.

[0045] In this embodiment of the invention, the central radius of curvature R1 of the object side of the first lens L1 and the central radius of curvature R2 of the image side of the first lens L1 satisfy the following condition: 2.2 ≤ R1 / R2 ≤ 3.8. Thus, the first lens L1 can collect light rays with a large field of view, which is beneficial for increasing the amount of light transmitted.

[0046] In this embodiment of the invention, the total lens length (TTL), the image height (H) corresponding to the maximum field of view (FOV) of the glass-plastic hybrid optical system satisfy the following condition: 0.01 ≤ TTL / H / FOV ≤ 0.03. Optimizing this condition allows for further reduction in the size of the glass-plastic hybrid lens under the same imaging plane and image height, with the minimum total lens length (TTL) reaching 8mm.

[0047] In this embodiment of the invention, the combined focal length Fa of the lens on the object side of the stop STO and the effective focal length F of the glass-plastic hybrid optical system satisfy the following condition: 1.3 ≤ |Fa / F| ≤ 35; the combined focal length Fb of the lens on the image side of the stop STO and the effective focal length F of the glass-plastic hybrid optical system satisfy the following condition: 1.4 ≤ |Fb / F| ≤ 3.0. Essentially, the combined focal length Fa refers to the combined focal length value of the first lens L1, the second lens L2, and the third lens L3, and the combined focal length Fb refers to the combined focal length value of the fourth lens L1, the fifth lens L5, and the sixth lens L6. Thus, by utilizing the ratio of the focal lengths of the lens groups on both sides of the stop STO to the total focal length (i.e., the effective focal length F) of the glass-plastic hybrid optical system, it is beneficial to improve the overall imaging performance of the lens optical system.

[0048] In summary, this glass-plastic hybrid optical system, employing the aforementioned technical architecture, combines the advantages of a wide angle of view, large aperture, small size, and low cost. It maintains focus within a temperature range of -20℃ to 60℃, making it suitable for various environments. Furthermore, it achieves high-definition imaging even under varying ambient light conditions. Specifically, it can achieve a maximum aperture of FNO1.8, a minimum total lens length of 8mm, and an object-side field of view of 195°–199°. Moreover, the CRA lens is compatible with multiple sensors, offering broad application prospects and enhancing its market competitiveness.

[0049] The glass-plastic hybrid optical system of the present invention will be specifically described below with reference to the accompanying drawings and tables, using four embodiments. In the following embodiments, the aperture stop STO is referred to as one side, and the image plane IMA is referred to as another side.

[0050] The parameters for each embodiment that meets the above conditions are shown in Table 1 below:

[0051]

[0052]

[0053] Table 1

[0054] In an embodiment of the present invention, the plastic aspherical lens of the glass-plastic hybrid optical system satisfies the following formula:

[0055]

[0056] In the above formula, z is the axial distance from the vertex to the surface at a position perpendicular to the optical axis at a height h; c represents the curvature at the vertex of the aspherical surface; k is the conic coefficient; A4, A6, A8, A 10 A 12 A 14 A16 ... represent aspherical coefficients of order 4, 6, 8, 10, 12, 14, and 16 respectively.

[0057] Example 1

[0058] The parameters of the glass-plastic hybrid optical system in this embodiment are as follows:

[0059] FNO: 1.80; Total lens length: 9.27mm; Field of view: 195°.

[0060] Table 2 lists the relevant parameters of each lens in the glass-plastic hybrid optical system of this embodiment, including: surface type, radius of curvature (R value), thickness, refractive index of the material, and Abbe number.

[0061]

[0062]

[0063] Table 2

[0064] Table 3 lists the aspherical coefficients of each aspherical lens in the glass-plastic hybrid optical system of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A... 10 and the twelfth-order aspherical coefficient A 12 .

[0065]

[0066] Table 3

[0067] like Figure 1 As shown in Tables 1 to 3 above, in this embodiment, the fifth lens L5 is a negative power lens, and the sixth lens L6 is a positive power lens; the second lens L2 is a paraxial convex-concave lens, the third lens L3 is a paraxial concave-convex lens, the fourth lens L4 is a paraxial convex-convex lens, the fifth lens L5 is a paraxial convex-concave lens, and the sixth lens L6 is a paraxial convex-convex lens. The glass-plastic hybrid optical system of this embodiment combines the advantages of a large angle, large aperture, small size, and low cost, and remains focused within a temperature range of -20℃ to 60℃, making it suitable for various environments. Furthermore, it can achieve high-definition imaging even under varying external lighting conditions.

[0068] Example 2

[0069] The parameters of the glass-plastic hybrid optical system in this embodiment are as follows:

[0070] FNO: 1.78; Total lens length: 8.11mm; Field of view: 195°.

[0071] Table 4 lists the relevant parameters of each lens in the glass-plastic hybrid optical system of this embodiment, including: surface type, radius of curvature (R value), thickness, refractive index of the material, and Abbe number.

[0072] Surface No. Surface Type R value Thickness Refractive Index Abbe Number S1 Sphere 5.904 0.501 1.74 52.68 S2 Sphere 2.051 1.243 S3 Asphere -10.371 0.390 1.54 55.99 S4 Asphere 1.078 0.401 S5 Asphere 2.437 1.363 1.66 20.38 S6 Asphere 7.913 0.109 S7 (STO) Sphere Infinity 0.054 S8 Asphere -4.703 0.742 1.54 55.98 S9 Asphere -1.251 0.186 S10 Asphere 1.523 1.287 1.54 55.98 S11 Asphere -1.253 0.048 S12 Asphere -1.208 0.719 1.66 20.38 S13 Asphere -5.384 0.360 S14 Sphere Infinity 0.210 1.52 64.20 S15 Sphere Infinity 0.500 S16 (IMA) Sphere Infinity - - -

[0073] Table 4

[0074] Table 5 lists the aspherical coefficients of each aspherical lens in the glass-plastic hybrid optical system of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A... 10 and the twelfth-order aspherical coefficient A 12 .

[0075] Surface No. K [A4] [A6] [A8] A 10 ]]> A 12 ]] S3 0.00E+00 2.93E-02 -2.84E-03 7.75E-05 5.18E-06 3.18E-07 S4 2.30E-01 -5.60E-02 -1.06E-02 1.76E-02 -3.93E-03 -4.27E-03 S5 -3.58E-01 -5.45E-02 -5.85E-03 4.58E-03 -2.74E-02 -2.27E-03 S6 0.00E+00 2.13E-01 5.56E-03 1.02E-01 -9.80E-02 -5.22E-02 S8 0.00E+00 2.19E-01 4.56E-02 -4.90E-01 5.97E-01 7.59E-02 S9 -4.48E-01 -7.79E-03 -1.11E-01 1.05E-01 -1.26E-01 1.48E-02 S10 -2.95E-01 -2.63E-02 -2.60E-02 2.48E-02 -1.29E-02 -2.26E-05 S11 -2.46E-01 4.69E-02 6.67E-02 -2.18E-02 4.86E-03 -2.31E-05 S12 -4.28E-01 7.69E-02 3.14E-02 -3.64E-03 1.96E-03 8.68E-05 S13 0.00E+00 1.25E-01 -3.43E-02 3.49E-02 -1.29E-02 -6.64E-05

[0076] Table 5

[0077] like Figure 2 As shown in Tables 1, 4, and 5 above, in this embodiment, the fifth lens L5 is a positive power lens, and the sixth lens L6 is a negative power lens; the second lens L2 is a paraxial concave-concave lens, the third lens L3 is a paraxial convex-concave lens, the fourth lens L4 is a paraxial concave-convex lens, the fifth lens L5 is a paraxial convex-convex lens, and the sixth lens L6 is a paraxial concave-convex lens. The glass-plastic hybrid optical system of this embodiment combines the advantages of a large angle, large aperture, small size, and low cost, and remains focused within a temperature range of -20℃ to 60℃, making it suitable for various environments. Furthermore, it can achieve high-definition imaging even under varying external lighting conditions.

[0078] Example 3

[0079] The parameters of the glass-plastic hybrid optical system in this embodiment are as follows:

[0080] FNO: 1.79; Total lens length: 8.00mm; Field of view: 199°.

[0081] Table 6 lists the relevant parameters of each lens in the glass-plastic hybrid optical system of this embodiment, including: surface type, radius of curvature (R value), thickness, refractive index of the material, and Abbe number.

[0082] Surface No. Surface Type R value Thickness Refractive Index Abbe Number S1 Sphere 5.276 0.515 1.88 40.81 S2 Sphere 2.000 1.255 S3 Asphere -7.581 0.268 1.54 55.99 S4 Asphere 1.035 0.482 S5 Asphere 1.976 1.268 1.66 20.38 S6 Asphere 13.761 0.092 S7 (STO) Sphere Infinity 0.057 S8 Asphere -3.038 0.730 1.54 55.98 S9 Asphere -1.281 0.113 S10 Asphere 1.452 1.410 1.54 55.98 S11 Asphere -1.000 0.779 1.66 20.38 S12 Asphere -5.044 0.360 S14 Sphere Infinity 0.210 1.52 64.20 S15 Sphere Infinity 0.463 S16 (IMA) Sphere Infinity - - -

[0083] Table 6

[0084] Table 7 lists the aspherical coefficients of each aspherical lens in the glass-plastic hybrid optical system of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A... 10and the twelfth-order aspherical coefficient A 12 .

[0085]

[0086]

[0087] Table 7

[0088] like Figure 3 As shown in Tables 1, 6, and 7 above, in this embodiment, the fifth lens L5 is a positive power lens, and the sixth lens L6 is a negative power lens; the second lens L2 is a paraxial concave-concave lens, the third lens L3 is a paraxial convex-concave lens, the fourth lens L4 is a paraxial concave-convex lens, the fifth lens L5 is a paraxial convex-convex lens, and the sixth lens L6 is a paraxial concave-convex lens. The glass-plastic hybrid optical system of this embodiment combines the advantages of a large angle, large aperture, small size, and low cost, and remains focused within a temperature range of -20℃ to 60℃, making it suitable for various environments. Furthermore, it can achieve high-definition imaging even under varying external lighting conditions.

[0089] Example 4

[0090] The parameters of the glass-plastic hybrid optical system in this embodiment are as follows:

[0091] FNO: 1.79; Total lens length: 8.01mm; Field of view: 195°.

[0092] Table 8 lists the relevant parameters of each lens in the glass-plastic hybrid optical system of this embodiment, including: surface type, radius of curvature (R value), thickness, refractive index of the material, and Abbe number.

[0093]

[0094]

[0095] Table 8

[0096] Table 9 lists the aspherical coefficients of each aspherical lens in the glass-plastic hybrid optical system of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A... 10 and the twelfth-order aspherical coefficient A 12 .

[0097]

[0098]

[0099] Table 9

[0100] like Figure 4As shown in Tables 1, 8, and 9 above, in this embodiment, the fifth lens L5 is a positive power lens, and the sixth lens L6 is a negative power lens; the second lens L2 is a paraxial convex-concave lens, the third lens L3 is a paraxial convex-concave lens, the fourth lens L4 is a paraxial concave-convex lens, the fifth lens L5 is a paraxial convex-convex lens, and the sixth lens L6 is a paraxial concave-convex lens. The glass-plastic hybrid optical system of this embodiment combines the advantages of a large angle, large aperture, small size, and low cost, and remains focused within a temperature range of -20℃ to 60℃, making it suitable for various environments. Furthermore, it can achieve high-definition imaging even under varying external lighting conditions.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A glass-plastic hybrid optical system, comprising: A first lens (L1) of negative refractive power, a second lens (L2) of negative refractive power, a third lens (L3) of positive refractive power, a stop (STO), a fourth lens (L4) of positive refractive power, a fifth lens (L5), and a sixth lens (L6) are arranged in order from the object side to the image side along the optical axis, and the total number of lenses having refractive power is six, characterized in that the refractive powers of the fifth lens (L5) and the sixth lens (L6) are opposite in sign. The first lens (L1) is a convex-concave lens, the near-axis region of the image side surface of the second lens (L2) is concave, the third lens (L3) is a near-axis region concave-convex lens or a near-axis region convex-concave lens, the near-axis regions of the image side surfaces of the fourth lens (L4) and the sixth lens (L6) are both convex, and the near-axis region of the object side surface of the fifth lens (L5) is convex. The combined focal length Fa of the lens on the object side of the stop (STO), the combined focal length Fb of the lens on the image side of the stop (STO), and the effective focal length F of the glass-plastic hybrid optical system satisfy the following conditional expressions: 1.3 ≤ |Fa / F| ≤ 35; 1.4 ≤ |Fb / F| ≤ 3.0; The entrance pupil diameter ENPD of the glass-plastic hybrid optical system and the total track length TTL of the glass-plastic hybrid optical system satisfy the following conditional expression: 0.043 ≤ ENPD / TTL ≤ 0.

09.

2. The glass-plastic hybrid optical system according to claim 1, wherein The first lens (L1) is a glass spherical lens. The second lens (L2), the third lens (L3), the fourth lens (L4), the fifth lens (L5), and the sixth lens (L6) are all plastic aspherical lenses.

3. The glass-plastic hybrid optical system according to claim 1 or 2, characterized by, The focal length F1 of the first lens (L1), the focal length F2 of the second lens (L2), the focal length F3 of the third lens (L3), the focal length F4 of the fourth lens (L4), the focal length F5 of the fifth lens (L5), and the focal length F6 of the sixth lens (L6) and the effective focal length F of the glass-plastic hybrid optical system satisfy the following conditional expressions: -7.0 ≤ F1 / F ≤ -4.1; -4.9 ≤ F2 / F ≤ -1.5; 3.3 ≤ F3 / F ≤ 10.0; 2.0 ≤ F4 / F ≤ 4.5; -2.7 ≤ F5 / F ≤ 2.1; -3.1 ≤ F6 / F ≤ 2.

8.

4. The glass-plastic hybrid optical system according to claim 1 or 2, wherein The back focal length BFL of the glass-plastic hybrid optical system and the total track length TTL of the glass-plastic hybrid optical system satisfy the following conditional expression: 0.1 ≤ BFL / TTL ≤ 0.

3.

5. The glass-plastic hybrid optical system according to claim 1 or 2, wherein The focal length F5 of the fifth lens (L5), the focal length F6 of the sixth lens (L6), and the effective focal length F of the glass-plastic hybrid optical system satisfy the following conditional expression: -1.6 ≤ (F5 / F6) / F ≤ -0.

5.

6. The glass-plastic hybrid optical system according to claim 1 or 2, wherein The effective focal length F of the glass-plastic hybrid optical system and the total track length TTL of the glass-plastic hybrid optical system satisfy the following conditional expression: 8.8 ≤ TTL / F ≤ 13.

3.

7. The glass-plastic hybrid optical system according to claim 1 or 2, wherein The distance D456 from the object side surface of the fourth lens (L4) to the image side surface of the sixth lens (L6) and the total track length TTL of the glass-plastic hybrid optical system satisfy the following conditional expression: 0.1 ≤ D456 / TTL ≤ 0.

6.

8. The glass-plastic hybrid optical system according to claim 1 or 2, wherein An air interval D45 between the fourth lens (L4) and the fifth lens (L5) and a total track length TTL of the hybrid plastic optical system satisfy the following conditional expression: 0.001 ≤ D45 / TTL ≤ 0.

08.

9. The glass-plastic hybrid optical system according to claim 1 or 2, wherein A distance D56 on the optical axis from an image side surface of the fifth lens (L5) to an object side surface of the sixth lens (L6) and an effective focal length F of the hybrid plastic optical system satisfy the following conditional expression: 0 ≤ D56 / F ≤ 0.

4.

10. The glass-plastic hybrid optical system according to claim 1 or 2, wherein A central curvature radius R1 of the object side surface of the first lens (L1) and a central curvature radius R2 of the image side surface of the first lens (L1) satisfy the following conditional expression: 2.2 ≤ R1 / R2 ≤ 3.

8.

11. The glass-plastic hybrid optical system according to claim 1 or 2, wherein A total track length TTL of the hybrid plastic optical system, an image height H corresponding to a maximum field angle of the hybrid plastic optical system, and a maximum field angle FOV of the hybrid plastic optical system satisfy the following conditional expression: 0.01 ≤ TTL / H / FOV ≤ 0.03.

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