Glass-plastic hybrid lens

Abstract

The present invention relates to a glass-plastic hybrid lens, comprising a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), a seventh lens (7) and an eighth lens (8) arranged in sequence along an optical axis from the object side to the image side, wherein the first lens (1) and the sixth lens (6) are negative power lenses; the third lens (3), the fourth lens (4), the fifth lens (5) and the seventh lens (7) are positive power lenses; and the second lens (2) and the eighth lens (8) are negative power lenses or positive power lenses. The glass-plastic hybrid lens of the present invention has the advantages of large aperture, high pixel count, small size, usability during day and night, and no defocusing in the range of -40°C to -80°C.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging, and in particular to a glass-plastic hybrid lens. Background Art

[0002] With the rapid advancement of science and technology, people have higher expectations for security, and this has led to a surge in demand for surveillance lenses. Compared to zoom lenses, fixed-focus lenses are simpler to design and manufacture. They capture clear, stable, and detailed images of moving objects, and can record 24 hours a day. These performance characteristics play a crucial role in the security lens industry. Current requirements for fixed-focus security lenses are trending towards higher-definition imaging, improved field of view, and clear imaging in low-light conditions. However, at night, due to the lack of sunlight, small-aperture lenses can only be used with infrared fill light. Therefore, to address these issues, a fixed-focus lens with a large aperture, high light throughput, and no infrared requirements is needed for both day and night use. Summary of the Invention

[0003] The purpose of the present invention is to solve the above problems and provide a large aperture glass-plastic hybrid lens.

[0004] To achieve the above-mentioned object of the present invention, the present invention provides a glass-plastic hybrid lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from the object side to the image side along the optical axis, wherein the first lens and the sixth lens are negative optical power lenses;

[0005] The third lens, the fourth lens, the fifth lens and the seventh lens are positive power lenses;

[0006] The second lens and the eighth lens are negative power lenses or positive power lenses.

[0007] According to one aspect of the present invention, the fifth lens, the sixth lens and the seventh lens are independent lenses.

[0008] According to one aspect of the present invention, the fifth lens and the sixth lens form a cemented lens group, the sixth lens and the seventh lens form a cemented lens group, or the fifth lens, the sixth lens and the seventh lens form a cemented lens group.

[0009] According to one aspect of the present invention, along the direction from the object side to the image side, the first lens is a convex-concave lens, the second lens is a concave-convex lens, the third lens is a convex-concave lens, the fourth lens is a concave-convex lens, the fifth lens is a convex-convex lens, the sixth lens is a concave-concave lens, the seventh lens is a convex-convex lens, and the paraxial zone of the eighth lens is a convex-concave lens.

[0010] According to one aspect of the present invention, the first lens, the second lens, the third lens and the eighth lens are aspherical lenses;

[0011] The fourth lens, the fifth lens, the sixth lens and the seventh lens are spherical lenses.

[0012] According to one aspect of the present invention, all aspherical lenses in the glass-plastic hybrid lens satisfy the relationship:

[0013]

[0014] Where z is the axial distance from the surface to the vertex at a height h perpendicular to the optical axis along the optical axis; c represents the curvature at the vertex of the aspheric surface; k is the conic coefficient; A4, A6, A8, A 10 、A 12 、A 14 、A 16 ···represent the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order···aspheric coefficients respectively.

[0015] According to one aspect of the present invention, the combined focal length of the fifth lens, the sixth lens and the seventh lens is fb, the effective focal length of the glass-plastic hybrid lens is f, and the relationship 2≤fb / f≤3 is satisfied.

[0016] According to one aspect of the present invention, the effective focal length of the glass-plastic hybrid lens is f, and the effective focal length of the fifth lens is f5, satisfying 1≤f5 / f≤3.

[0017] According to one aspect of the present invention, the refractive index Nd5 of the fifth lens element is ≥1.55, and the Abbe number Vd5 is ≥50.

[0018] According to one aspect of the present invention, the refractive index Nd7 of the seventh lens element is ≥1.65.

[0019] According to one aspect of the present invention, the glass-plastic hybrid lens further includes an aperture, and the aperture (S) is located between the first lens and the second lens, between the second lens and the third lens, or between the third lens and the fourth lens.

[0020] According to one aspect of the present invention, the aperture number Fno of the glass-plastic hybrid lens is ≤1.2.

[0021] According to one aspect of the present invention, the chief ray deviation angle CRA of the glass-plastic hybrid lens is ≤15°.

[0022] According to one aspect of the present invention, the total length of the optical system of the glass-plastic hybrid lens is ≤30.23 mm.

[0023] The glass-plastic hybrid lens of the present invention adopts a common setting form of an aspheric lens made of plastic material and a spherical lens made of glass material, which reduces the production cost of the lens of the present invention. The lens of the present invention can achieve a large aperture, and meet the requirements of high-pixel image output, and ensure high resolution under a large aperture. In addition, the overall illumination of the lens of the present invention is uniform and the brightness is high (relative illumination is more than 45%). Moreover, the lens of the present invention can achieve full-color restoration shooting in the visible light band and in dark environments, can be in a temperature range of -40℃-80℃ without defocusing, and has a wide range of applicable environments. The image surface of the lens of the present invention is as high as φ9.1mm, the main light deviation angle CRA≤15°, it can be adapted to a variety of sensors, and has broad application prospects. The field of view angle of the lens of the present invention can reach 113°, and the total length of the optical system is within 30.23mm, which is conducive to the miniaturization of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematically showing the structure of a glass-plastic hybrid lens according to Example 1 of the present invention;

[0025] Figure 2 Schematically showing the MTF diagram of the glass-plastic hybrid lens according to Example 1 of the present invention;

[0026] Figure 3 Schematically showing the Through-Focus-MTF graph of the glass-plastic hybrid lens according to Example 1 of the present invention at a high temperature of 80°C and a frequency of 125 lp / mm;

[0027] Figure 4 Schematically showing a Through-Focus-MTF graph of the glass-plastic hybrid lens according to Example 1 of the present invention at a low temperature of -40°C and a frequency of 125 lp / mm;

[0028] Figure 5 Schematically showing the structure of a glass-plastic hybrid lens according to Example 2 of the present invention;

[0029] Figure 6 Schematically showing the MTF diagram of the glass-plastic hybrid lens according to Example 2 of the present invention;

[0030] Figure 7 Schematically showing the Through-Focus-MTF graph of the glass-plastic hybrid lens according to Example 2 of the present invention at a high temperature of 80°C and a frequency of 125 lp / mm;

[0031] Figure 8 Schematically showing a Through-Focus-MTF graph of the glass-plastic hybrid lens according to Example 2 of the present invention at a low temperature of -40°C and a frequency of 125 lp / mm;

[0032] Figure 9Schematically showing the structure of a glass-plastic hybrid lens according to Example 3 of the present invention;

[0033] Figure 10 Schematically showing the MTF diagram of the glass-plastic hybrid lens according to Example 3 of the present invention;

[0034] Figure 11 Schematically showing the Through-Focus-MTF graph of the glass-plastic hybrid lens according to Example 3 of the present invention at a high temperature of 80°C and a frequency of 125 lp / mm;

[0035] Figure 12 Schematically showing a Through-Focus-MTF graph of the glass-plastic hybrid lens according to Example 3 of the present invention at a low temperature of -40°C and a frequency of 125 lp / mm;

[0036] Figure 13 Schematically showing the structure of a glass-plastic hybrid lens according to Example 4 of the present invention;

[0037] Figure 14 Schematically showing the MTF diagram of the glass-plastic hybrid lens according to Example 4 of the present invention;

[0038] Figure 15 Schematically showing the Through-Focus-MTF graph of the glass-plastic hybrid lens according to Example 4 of the present invention at a high temperature of 80°C and a frequency of 125 lp / mm;

[0039] Figure 16 Schematically showing a Through-Focus-MTF graph of the glass-plastic hybrid lens according to Example 4 of the present invention at a low temperature of -40°C and a frequency of 125 lp / mm;

[0040] Figure 17 Schematically showing the structure of a glass-plastic hybrid lens according to Example 5 of the present invention;

[0041] Figure 18 Schematically showing the MTF diagram of the glass-plastic hybrid lens according to Example 5 of the present invention;

[0042] Figure 19 Schematically showing the Through-Focus-MTF graph of the glass-plastic hybrid lens according to Example 5 of the present invention at a high temperature of 80°C and a frequency of 125 lp / mm;

[0043] Figure 20 Schematically showing a Through-Focus-MTF graph of the glass-plastic hybrid lens according to Example 5 of the present invention at a low temperature of -40°C and a frequency of 125 lp / mm;

[0044] Figure 21Schematically showing the structure of a glass-plastic hybrid lens according to Example 6 of the present invention;

[0045] Figure 22 Schematically showing the MTF diagram of the glass-plastic hybrid lens according to Example 6 of the present invention;

[0046] Figure 23 Schematically showing the Through-Focus-MTF graph of the glass-plastic hybrid lens according to Example 6 of the present invention at a high temperature of 80°C and a frequency of 125 lp / mm;

[0047] Figure 24 The Through-Focus-MTF diagram of the glass-plastic hybrid lens according to Example 6 of the present invention at a low temperature of -40°C and a frequency of 125 lp / mm is schematically shown. DETAILED DESCRIPTION

[0048] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0049] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0050] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0051] Figure 1 FIG2 is a schematic diagram showing the structure of a glass-plastic hybrid fixed-focus lens according to an embodiment of the present invention. Figure 1As shown, the glass-plastic hybrid fixed-focus lens of the present invention is composed of glass lenses and plastic lenses, including: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and an eighth lens 8, arranged in sequence along the optical axis from the object side to the image side. In the present invention, the first lens 1 and the sixth lens 6 are negative optical power lenses, the third lens 3, the fourth lens 4, the fifth lens 5, and the seventh lens 7 are positive optical power lenses, and the second lens 2 and the eighth lens 8 are either negative optical power lenses or positive optical power lenses. By setting the positive and negative optical powers of each lens in this way, aberrations are effectively corrected, while ensuring the large aperture and high pixel count of the glass-plastic hybrid lens of the present invention.

[0052] According to one embodiment of the present invention, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are independent lenses. According to a second embodiment of the present invention, at least two of the fifth lens 5, the sixth lens 6, and the seventh lens 7 form a cemented lens group. In other words, according to the concept of the present invention, the fifth lens 5, the sixth lens 6, and the seventh lens L7 form a cemented lens group as a cemented lens group, or the fifth lens 5 and the sixth lens 6 form a doublet as a cemented lens group, or the sixth lens 6 and the seventh lens 7 form a doublet as a cemented lens group, or the fifth lens 5, the sixth lens L6, and the seventh lens L7 are not cemented.

[0053] In the glass-plastic hybrid lens of the present invention, along the direction from object side to image side, the first lens 1 is a convex-concave lens, the second lens 2 is a concave-convex lens, the third lens 3 is a convex-concave lens, the fourth lens 4 is a concave-convex lens, the fifth lens 5 is a convex-convex lens, the sixth lens 6 is a concave-concave lens, the seventh lens 7 is a convex-convex lens, and the paraxial region of the eighth lens 8 is a convex-concave lens. Furthermore, the first lens 1, the second lens 2, the third lens 3, and the eighth lens 8 are configured as aspherical lenses; and the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are configured as spherical lenses.

[0054] All aspheric surfaces in the glass-plastic hybrid lens of the present invention satisfy the following formula:

[0055]

[0056] Where z is the axial distance from the surface to the vertex at a height h perpendicular to the optical axis along the optical axis; c represents the curvature at the vertex of the aspheric surface; k is the cone coefficient; A4, A6, A8, A 10 、A 12 、A 14 、A 16 ···represent the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order···aspheric coefficients respectively.

[0057] This lens arrangement reduces production costs and maintains focus within a temperature range of -40°C to 80°C, overcoming the problem of focus drift in high and low temperature environments caused by the large expansion coefficient of plastic aspheric lenses. Furthermore, the lens maintains good tolerances for individual components and assembly, ensuring excellent manufacturability.

[0058] Furthermore, in the lens of the present invention, the combined focal length of the fifth lens element 5, the sixth lens element 6, and the seventh lens element 7 is fb, and the effective focal length of the glass-plastic hybrid lens element is f, satisfying the relationship 2≤fb / f≤3. Furthermore, the effective focal length f of the glass-plastic hybrid lens element and the effective focal length f5 of the fifth lens element 5 satisfy the relationship 1≤f5 / f≤3.

[0059] In the present invention, the refractive index Nd5 of the fifth lens element 5 is ≥1.55, and the Abbe number Vd5 is ≥50. The refractive index Nd7 of the seventh lens element 7 is ≥1.65.

[0060] The glass-plastic hybrid lens of the present invention further includes an aperture S, which is located between the first lens 1 and the second lens 2, between the second lens 2 and the third lens 3, or between the third lens 3 and the fourth lens 4. The glass-plastic hybrid lens of the present invention has an aperture number Fno ≤ 1.2, a chief ray deviation angle CRA ≤ 15°, and a total optical system length ≤ 30.23 mm.

[0061] Combining the above settings, the lens of the present invention can achieve a large aperture and meet the requirements of high-pixel image output, ensuring high resolution at a large aperture. In addition, the overall illumination of the lens of the present invention is uniform and the brightness is high (relative illumination is more than 45%). Moreover, the lens of the present invention can achieve full-color restoration shooting in the visible light band and in dark environments, can be in the temperature range of -40℃-80℃ without defocusing, and has a wide range of applicable environments. The image surface of the lens of the present invention is as high as φ9.1mm, the main ray deviation angle CRA≤15°, it can be adapted to a variety of sensors, and has broad application prospects. The field of view angle of the lens of the present invention can reach 113°, and the total length of the optical system is within 30.23mm, which is conducive to the miniaturization of the lens.

[0062] The following six specific embodiments, based on the aforementioned configuration, illustrate the glass-plastic hybrid lens according to the present invention. Because the glass-plastic hybrid lens according to the present invention comprises eight lenses, including the aperture S, the imaging surface IMA, and the flat filter IR between the imaging surface IMA and the lens, there are a maximum of 20 optical surfaces. For ease of description, the surfaces are numbered S1 to S20.

[0063] The data of the six implementation methods are shown in Table 1 below:

[0064] Conditional expression Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 2≤|fb / f|≤3 2.76 2.35 2.97 2.4 2.43 2.84 1≤f5 / f≤3 2.04 2.57 2.87 1.67 1.31 2.14

[0065] Implementation method one:

[0066] Figure 1 Schematically shows the structure of a glass-plastic hybrid lens according to embodiment 1 of the present invention.

[0067] In the first embodiment, the aperture FNO=1.04, the total length of the lens optical system is 26.92 mm, the field of view angle is 113°, the aperture S is set between the third lens 3 and the fourth lens 4, and the fifth lens 5, the sixth lens 6 and the seventh lens 7 form a triplet lens as a cemented lens group.

[0068] Table 2 below lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number:

[0069] Surface number Surface type R-value thickness Refractive index Abbe number S0(OBJ) spherical surface Infinity Infinity S1 Aspheric 9.2965 2.4829 1.55 55.0 S2 Aspheric 1.6465 0.7599 S3 Aspheric -9.2095 2.8399 1.50 56.1 S4 Aspheric -15.3470 0.0839 S5 Aspheric 80.3665 1.1669 1.60 22.0 S6 Aspheric 9.2604 1.8980 S7(STO) spherical surface Infinity 0.4434 S8 spherical surface -78.6417 2.9938 1.56 60.0 S9 spherical surface -12.2072 0.5677 S10 spherical surface 26.8475 2.6084 1.58 61.0 S11 spherical surface -17.0155 0.5938 1.70 25.0 S12 spherical surface 66.5075 3.3015 1.70 46.0 S13 spherical surface -42.8755 0.0469 S14 Aspheric 13.0713 2.7968 1.50 56.0 S15 Aspheric 3.0175 3.4407 S16 spherical surface Infinity 0.7 1.52 64.2 S17 spherical surface Infinity 0.2 S18(IMA) spherical surface Infinity - - -

[0070] Table 2

[0071] In this embodiment, the aspheric surface data is shown in Table 3 below, where K is the quadratic surface constant of the surface, and A, B, C, D, E, F, and G are the aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively:

[0072]

[0073]

[0074] Table 3

[0075] Figures 2 to 4 The following diagrams schematically show the MTF diagram of the glass-plastic hybrid lens according to the first embodiment of the present invention; the Through-Focus-MTF diagram at a high temperature of 80°C and a frequency of 125lp / mm; and the Through-Focus-MTF diagram at a low temperature of -40°C and a frequency of 125lp / mm. Figures 2 to 4 It can be seen that the lens of this embodiment achieves the characteristics of high resolution and high pixel, and can realize full-color restoration shooting in the visible light band and in dark environments. It has the characteristics of no out-of-focus in the temperature range of -40℃ to 80℃, while meeting the large aperture, expanding the scope of use of the product.

[0076] Implementation method 2:

[0077] Figure 5 Schematically shows the structure of a glass-plastic hybrid lens according to the second embodiment of the present invention.

[0078] In the second embodiment, the aperture FNO is 1.13, the total length of the lens optical system is 28.13 mm, and the field angle is 113°. The aperture S is set between the third lens 3 and the fourth lens 4, and the fifth lens and the sixth lens 6 form a doublet lens as a cemented lens group.

[0079] Table 4 below lists the relevant parameters of each lens of this embodiment, including surface type, curvature radius, thickness, refractive index of the material, and Abbe number:

[0080]

[0081]

[0082] Table 4

[0083] In this embodiment, the aspheric surface data is shown in Table 5 below, where K is the quadratic surface constant of the surface, and A, B, C, D, E, F, and G are the aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively:

[0084] Surface number K A B C D E F S1 -8.49E+00 -8.70E-03 5.90E-05 2.55E-07 -2.84E-08 2.98E-20 0.00E+00 S2 -8.76E-01 -7.64E-03 7.06E-05 9.57E-06 -8.86E-07 8.95E-09 0.00E+00 S3 2.90E+00 8.81E-03 -2.58E-04 9.89E-06 -7.78E-07 2.26E-08 0.00E+00 S4 -7.01E-01 6.57E-04 -2.83E-05 -7.22E-07 2.03E-07 -2.70E-20 0.00E+00 S5 -5.30E+00 -4.73E-04 7.04E-05 -2.28E-06 7.80E-08 -2.28E-22 0.00E+00 S6 -2.09E+01 -2.09E-03 5.95E-05 -8.85E-06 6.89E-08 -4.89E-22 0.00E+00 S14 -8.23E+00 6.41E-04 -8.48E-05 7.30E-06 -5.86E-09 7.70E-22 -2.26E-24 S15 -8.30E+00 -8.07E-05 -7.75E-05 2.91E-06 -7.95E-20 2.59E-22 2.69E-27

[0085] Table 5

[0086] Figures 6 to 8 The following diagrams schematically show the MTF diagram of the glass-plastic hybrid lens according to the second embodiment of the present invention; the Through-Focus-MTF diagram at a high temperature of 80°C and a frequency of 125lp / mm; and the Through-Focus-MTF diagram at a low temperature of -40°C and a frequency of 125lp / mm. Figures 6 to 8 It can be seen that the lens of this embodiment achieves the characteristics of high resolution and high pixel, can realize full-color restoration shooting in the visible light band and in dark environments, has the characteristics of no out-of-focus in the temperature range of -40℃ to 80℃, and at the same time meets the large aperture, expanding the scope of use of the product.

[0087] Implementation method three:

[0088] Figure 9 Schematic diagram of the structure of a glass-plastic hybrid lens according to embodiment 3 of the present invention.

[0089] In the third embodiment, the aperture FNO is 1.1, the total length of the lens optical system is 27.98 mm, and the field angle is 113°. The aperture S is set between the third lens 3 and the fourth lens 4, and the sixth lens 6 and the seventh lens 7 form a doublet lens as a cemented lens group.

[0090] Table 6 below lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number:

[0091] Surface number Surface type R-value thickness Refractive index Abbe number S0(OBJ) spherical surface Infinity Infinity S1 Aspheric 6.2965 1.4829 1.55 55.0 S2 Aspheric 2.6465 3.7599 S3 Aspheric -6.2095 2.8399 1.50 56.1 S4 Aspheric -6.3470 0.0584 S5 Aspheric 7.3665 1.1669 1.60 22.0 S6 Aspheric 9.2604 1.8980 S7(STO) spherical surface Infinity 0.4434 S8 spherical surface -78.6417 2.5738 1.56 60.0 S9 spherical surface -12.2072 0.0677 S10 spherical surface 14.8475 2.2084 1.58 61.0 S11 spherical surface -14.9987 0.3998 S12 spherical surface -11.0155 0.5938 1.70 25.0 S13 spherical surface 48.5075 3.3015 1.70 46.0 S14 spherical surface -14.8755 0.0469 S15 Aspheric 10.0713 2.7968 1.50 56.0 S16 Aspheric 1.0175 3.4407 S17 spherical surface Infinity 0.7 1.52 64.2 S18 spherical surface Infinity 0.2 S19(IMA) spherical surface Infinity - - -

[0092] Table 6

[0093] In this embodiment, the aspheric surface data is shown in Table 7 below, where K is the quadratic surface constant of the surface, and A, B, C, D, E, F, and G are the aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively:

[0094]

[0095]

[0096] Table 7

[0097] Figures 10 to 12 The following diagrams schematically show the MTF diagram of the glass-plastic hybrid lens according to embodiment 3 of the present invention; the Through-Focus-MTF diagram at a high temperature of 80°C and a frequency of 125lp / mm; and the Through-Focus-MTF diagram at a low temperature of -40°C and a frequency of 125lp / mm. Figures 10 to 12 It can be seen that the lens of this embodiment achieves the characteristics of high resolution and high pixel, can realize full-color restoration shooting in the visible light band and in dark environments, has the characteristics of no out-of-focus in the temperature range of -40℃ to 80℃, and at the same time meets the large aperture, expanding the scope of use of the product.

[0098] Implementation method four:

[0099] Figure 13 Schematic diagram of the structure of a glass-plastic hybrid lens according to embodiment 4 of the present invention.

[0100] In the fourth embodiment, the aperture Fno is 1.19, the total length of the lens optical system is 29.67 mm, and the field angle is 113°. The aperture S is set between the third lens 3 and the fourth lens 4, and the fifth lens 5, the sixth lens 6 and the seventh lens 7 are not cemented.

[0101] Table 8 below lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number:

[0102]

[0103]

[0104] Table 8

[0105] In this embodiment, the aspheric surface data is shown in Table 9 below, where K is the quadratic surface constant of the surface, and A, B, C, D, E, F, and G are the aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively:

[0106] Surface number K A B C D E F S1 -6.57E+00 -6.70E-03 5.69E-05 2.56E-07 -2.45E-04 2.94E-20 0.00E+00 S2 -4.36E-01 -3.65E-03 3.06E-05 9.57E-06 -4.66E-07 6.96E-09 0.00E+00 S3 2.70E+00 6.41E-03 -2.58E-04 9.45E-06 -3.74E-07 2.26E-04 0.00E+00 S4 -7.01E-01 6.57E-04 -2.42E-05 -3.22E-07 2.02E-07 -2.70E-20 0.00E+00 S5 -5.29E+00 -5.73E-04 3.05E-05 -2.26E-06 3.80E-04 -2.24E-22 0.00E+00 S6 -2.05E+01 -2.04E-03 5.96E-05 -6.65E-06 6.65E-04 -5.65E-22 0.00E+00 S16 -4.23E+00 6.50E-04 -4.54E-05 3.30E-06 -5.66E-09 3.69E-22 -2.27E-25 S17 -4.30E+00 -4.07E-05 -7.36E-05 2.91E-06 -3.96E-20 2.55E-22 2.66E-23

[0107] Table 9

[0108] Figures 14 to 16 The following diagrams schematically show the MTF diagram of the glass-plastic hybrid lens according to the fourth embodiment of the present invention; the Through-Focus-MTF diagram at a high temperature of 80°C and a frequency of 125 lp / mm; and the Through-Focus-MTF diagram at a low temperature of -40°C and a frequency of 125 lp / mm. Figures 14 to 16 It can be seen that the lens of this embodiment achieves the characteristics of high resolution and high pixel, can realize full-color restoration shooting in the visible light band and in dark environments, has the characteristics of no out-of-focus in the temperature range of -40℃ to 80℃, and at the same time meets the large aperture, expanding the scope of use of the product.

[0109] Implementation method five:

[0110] Figure 17 Schematically shows the structure of a glass-plastic hybrid lens according to embodiment 5 of the present invention.

[0111] In the fifth embodiment, the aperture Fno is 1.13, the total length of the lens optical system is 27.76 mm, and the field of view is 113°. The aperture S is disposed between the first lens 1 and the second lens 2. The fifth lens 5, the sixth lens 6, and the seventh lens 7 form a triplet lens as a cemented lens group.

[0112] Table 10 below lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number:

[0113] Surface number Surface type R-value thickness Refractive index Abbe number S0(OBJ) spherical surface Infinity Infinity S1 Aspheric 13.2816 1.4287 1.55 55.0 S2 Aspheric 1.9476 2.7365 S3(STO) spherical surface Infinity 1.4997 S4 Aspheric -1.7076 1.1258 1.50 56.1 S5 Aspheric -10.2578 1.0000 S6 Aspheric 17.8308 0.5629 1.60 22.0 S7 Aspheric 10.1547 0.8917 S8 spherical surface -99.8979 2.6338 1.56 60.0 S9 spherical surface -4.6484 0.7000 S10 spherical surface 12.1856 3.5400 1.58 61.0 S11 spherical surface -12.1856 0.9000 1.70 25.0 S12 spherical surface 5.6193 3.5000 1.70 46.0 S13 spherical surface -14.3195 0.8000 S14 Aspheric 3.5121 2.5000 1.50 56.0 S15 Aspheric 8.7478 3.0458 S16 spherical surface Infinity 0.7 1.52 64.2 S17 spherical surface Infinity 0.2 S18(IMA) spherical surface Infinity - - -

[0114] Table 10

[0115] In this embodiment, the aspheric surface data is shown in Table 11 below, where K is the quadratic surface constant of the surface, and A, B, C, D, E, F, and G are the aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively:

[0116]

[0117]

[0118] Table 11

[0119] Figures 18 to 20 Schematically showing the MTF diagram of the glass-plastic hybrid lens according to embodiment 5 of the present invention; the Through-Focus-MTF diagram at a high temperature of 80°C and a frequency of 125lp / mm; and the Through-Focus-MTF diagram at a low temperature of -40°C and a frequency of 125lp / mm.

[0120] Depend on Figures 18 to 20 It can be seen that the lens of this embodiment achieves the characteristics of high resolution and high pixel, can realize full-color restoration shooting in the visible light band and in dark environments, has the characteristics of no out-of-focus in the temperature range of -40℃ to 80℃, and at the same time meets the large aperture, expanding the scope of use of the product.

[0121] Implementation method six:

[0122] Figure 21 Schematic diagram of the structure of a glass-plastic hybrid lens according to embodiment 6 of the present invention.

[0123] In the sixth embodiment, the aperture Fno is 1.13, the total length of the lens optical system is 26.53 mm, and the field of view is 113°. The aperture S is disposed between the second lens 2 and the third lens 3. The fifth lens 5, the sixth lens 6, and the seventh lens 7 form a triplet as a cemented lens group.

[0124] Table 12 below lists the relevant parameters of each lens of this embodiment, including surface type, curvature radius, thickness, refractive index of the material, and Abbe number:

[0125]

[0126]

[0127] Table 12

[0128] In this embodiment, the aspheric surface data is shown in Table 13 below, where K is the quadratic surface constant of the surface, and A, B, C, D, E, F, and G are the aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively:

[0129] Surface number K A B C D E F S1 -2.59E+00 -2.34E-04 -7.97E-05 1.99E-02 -6.18E-09 3.45E-11 0.00E+00 S2 -4.39E-01 -4.91E-05 -3.98E-04 1.67E-05 -3.39E-07 6.89E-09 0.00E+00 S3 5.71E-01 4.64E-03 -3.67E-04 8.93E-06 -6.03E-07 3.49E-09 0.00E+00 S4 -4.64E-01 7.93E-04 -9.49E-05 3.34E-08 4.77E-08 -4.76E-10 0.00E+00 S6 -4.97E+00 -3.02E-04 3.23E-05 -1.94E-06 8.27E-08 -9.64E-10 0.00E+00 S7 -3.38E+00 -6.87E-04 4.99E-05 -2.99E-06 8.70E-08 -8.29E-10 0.00E+00 S14 -3.99E+01 -1.39E-04 -1.54E-05 9.67E-07 -1.63E-07 6.54E-09 -3.56E-14 S15 4.1E-01 -3.64E-04 -2.64E-05 4.16E-06 -9.57E-08 3.39E-09 7.89E-13

[0130] Table 13

[0131] Figures 21 to 24 Schematically showing the MTF diagram of the glass-plastic hybrid lens according to embodiment 5 of the present invention; the Through-Focus-MTF diagram at a high temperature of 80°C and a frequency of 125lp / mm; and the Through-Focus-MTF diagram at a low temperature of -40°C and a frequency of 125lp / mm.

[0132] Depend on Figures 21 to 24 It can be seen that the lens of this embodiment achieves the characteristics of high resolution and high pixel, can realize full-color restoration shooting in the visible light band and in dark environments, has the characteristics of no out-of-focus in the temperature range of -40℃ to 80℃, and at the same time meets the large aperture, expanding the scope of use of the product.

[0133] According to the above-described embodiments of the present invention, the lens of the present invention utilizes a configuration that combines a plastic aspheric lens with a glass spherical lens, reducing the production cost of the lens of the present invention. The lens of the present invention can achieve a large aperture and meet the requirements of high-pixel image output, ensuring high resolution at a large aperture. By optimizing the positive and negative focal powers of each lens, the lens of the present invention effectively corrects aberrations; the overall illumination of the lens of the present invention is uniform and the brightness is high (relative illumination greater than 45%). The lens of the present invention can maintain focus within a temperature range of -40°C to 80°C, overcoming the difficulty of focus drift caused by the large expansion coefficient of plastic aspheric lenses in high and low temperature environments. The lens of the present invention can achieve full-color reproduction in the visible light band and in relatively dark environments. The lens of the present invention has good tolerances for individual components and assembly, and is well manufacturable. The image surface of the lens of the present invention is as large as 9.1mm, with a CRA ≤15°, and is compatible with a variety of sensors, with broad application prospects and enhanced market competitiveness. The lens of the present invention has a total length of less than 30.23mm and a compact size.

[0134] The above description is merely one embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A glass-plastic hybrid lens, comprising a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), a seventh lens (7) and an eighth lens (8), which are arranged in sequence from the object side to the image side along the optical axis, totaling eight lenses, characterized in that: The first lens (1) and the sixth lens (6) are negative power lenses; The third lens (3), the fourth lens (4), the fifth lens (5) and the seventh lens (7) are positive power lenses; The second lens (2) and the eighth lens (8) are negative power lenses or positive power lenses; The combined focal length of the fifth lens (5), the sixth lens (6) and the seventh lens (7) is fb, and the effective focal length of the glass-plastic hybrid lens is f, which satisfies: 2.35≤fb / f≤3; The aperture number Fno of the glass-plastic hybrid lens is ≤1.2; The effective focal length of the glass-plastic hybrid lens is f, and the effective focal length of the fifth lens (5) is f5, satisfying 1.67≤f5 / f≤3.

2. The glass-plastic hybrid lens according to claim 1, characterized in that: The fifth lens (5), the sixth lens (6) and the seventh lens (7) are independent lenses.

3. The glass-plastic hybrid lens according to claim 1, characterized in that: The fifth lens (5) and the sixth lens (6) form a cemented lens group, Or the sixth lens (6) and the seventh lens (7) form a cemented lens group, Alternatively, the fifth lens (5), the sixth lens (6) and the seventh lens (7) form a cemented lens group.

4. The glass-plastic hybrid lens according to any one of claims 1 to 3, characterized in that: Along the direction from the object side to the image side, the first lens (1) is a convex-concave lens, the second lens (2) is a concave-convex lens, the third lens (3) is a convex-concave lens, the fourth lens (4) is a concave-convex lens, the fifth lens (5) is a convex-convex lens, the sixth lens (6) is a concave-concave lens, the seventh lens (7) is a convex-convex lens, and the paraxial region of the eighth lens (8) is a convex-concave lens.

5. The glass-plastic hybrid lens according to claim 4, characterized in that: The first lens (1), the second lens (2), the third lens (3) and the eighth lens (8) are aspherical lenses; The fourth lens (4), the fifth lens (5), the sixth lens (6) and the seventh lens (7) are spherical lenses.

6. The glass-plastic hybrid lens according to claim 5, characterized in that: All aspherical lenses in the glass-plastic hybrid lens satisfy the relationship: Where z is the axial distance from the surface to the vertex at a height h perpendicular to the optical axis along the optical axis; c represents the curvature at the vertex of the aspheric surface; k is the conic coefficient; A4, A6, A8, A 10 、A 12 、A 14 、A 16 ···represent the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order···aspheric coefficients respectively.

7. The glass-plastic hybrid lens according to any one of claims 1 to 3, characterized in that: The refractive index Nd5 of the fifth lens (5) is ≥1.55, and the Abbe number coefficient Vd5 is ≥50.

8. The glass-plastic hybrid lens according to claim 7, characterized in that: The refractive index Nd7 of the seventh lens (7) is ≥1.

65.

9. The glass-plastic hybrid lens according to claim 1, characterized in that: The glass-plastic hybrid lens further includes a stop (S), which is located between the first lens (1) and the second lens (2), between the second lens (2) and the third lens (3), or between the third lens (3) and the fourth lens (4).

10. The glass-plastic hybrid lens according to claim 1, characterized in that: The chief ray deviation angle CRA of the glass-plastic hybrid lens is ≤15°.

11. The glass-plastic hybrid lens according to claim 1, characterized in that: The total length of the optical system of the glass-plastic hybrid lens is ≤30.23 mm.

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