Large image area wide angle lens

Abstract

The present invention relates to a wide-angle lens with a large image area, comprising a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a stop, a fifth lens (L5), a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), a ninth lens (L9) and a tenth lens (L10) arranged in sequence from the object side to the image side along an optical axis, wherein the first lens (L1), the second lens (L2), the fifth lens (L5) and the seventh lens (L7) are negative power lenses; and the third lens (L3), the fourth lens (L4), the sixth lens (L6), the eighth lens (L8), the ninth lens (L9) and the tenth lens (L10) are positive power lenses. The wide-angle lens with a large image area of ​​the present invention takes into account both wide-angle and low distortion performance, has a half field angle greater than 60°, and has an automatic temperature compensation function, and is not out of focus within a temperature range of ‑40°C to 85°C.

Description

Technical Field

[0001] The invention relates to the field of optical imaging, and in particular to a large-image wide-angle lens. Background Art

[0002] Video conferencing lenses are high-end optical devices for application scenarios, requiring a wide field of view, imaging performance of tens of millions of pixels, low-distortion imaging, and strong adaptability to large environments. Existing lenses of this type are difficult to develop and design, with high material costs, and it is difficult to simultaneously meet the performance requirements of wide angle and low distortion. Summary of the invention

[0003] The object of the present invention is to solve the above-mentioned problem and provide a wide-angle lens with a large image plane.

[0004] To achieve the purpose of the present invention, the present invention provides a wide-angle lens with a large image area, comprising a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence from the object side to the image side along the optical axis, wherein the first lens, the second lens, the fifth lens and the seventh lens are negative power lenses;

[0005] The third lens, the fourth lens, the sixth lens, the eighth lens, the ninth lens and the tenth lens are positive power lenses.

[0006] According to one aspect of the present invention, along the direction from the object side to the image side, the first lens, the second lens and the fifth lens are convex-concave lenses;

[0007] The sixth lens, the eighth lens and the ninth lens are biconvex lenses;

[0008] The third lens is a meniscus lens, and the seventh lens is a biconcave lens.

[0009] According to one aspect of the present invention, the fifth lens, the sixth lens and the seventh lens form a triplet lens, or the sixth lens and the seventh lens form a doublet lens, or the sixth lens, the seventh lens and the eighth lens form a triplet lens.

[0010] According to one aspect of the present invention, the refractive index of the fifth lens is Nd5, and the Abbe number is Vd5, which satisfies: 1.75≤Nd5≤1.95, 20.00≤Vd5≤26.00.

[0011] According to one aspect of the present invention, the refractive index of the sixth lens is Nd6, and the Abbe number is Vd6, which satisfies: 1.40≤Nd6≤1.60, 65.00≤Vd6≤96.00.

[0012] According to one aspect of the present invention, the refractive index of the seventh lens is Nd7, and the Abbe number is Vd7, which satisfies: 1.60≤Nd7≤1.80, 25.00≤Vd7≤35.00.

[0013] According to one aspect of the present invention, the refractive index of the eighth lens is Nd8, and the Abbe number is Vd8, which satisfies: 1.40≤Nd8≤1.60, 65.00≤Vd8≤96.00.

[0014] According to one aspect of the present invention, the second lens, the third lens, the ninth lens and the tenth lens are aspherical lenses.

[0015] According to one aspect of the present invention, the half image height IH of the large image wide-angle lens and the field of view FOV of the large image wide-angle lens satisfy the relationship: 2.50≤IH / tan(FOV / 2)≤4.5.

[0016] According to one aspect of the present invention, the effective focal length of the large image wide-angle lens is f, and the axial distance from the optical surface of the tenth lens (10) close to the image plane to the image plane is BFL, which satisfies the relationship: 0.35≤(1.25*f-BFL) / BFL≤0.45.

[0017] The wide-angle lens with a large image area of ​​the present invention can receive incident light at a large angle by arranging the lenses as described above and by properly placing and matching the positive power lenses and the negative power lenses. It also allows the incident light to sequentially pass through each optical deflection surface at a smaller angle, which is beneficial for correcting aberrations and improving resolution performance, and is also beneficial for reducing tolerance sensitivity.

[0018] The large image surface wide-angle lens of the present invention has a first lens, a second lens and a fifth lens along the direction from the object side to the image side, which are convex-concave lenses; the sixth lens, the eighth lens and the ninth lens are double convex lenses; the third lens is a concave-convex lens, and the seventh lens is a double concave lens. Such an arrangement enables the bending direction and shape of these lenses at specific positions of the entire lens system to receive large-angle incident light and achieve a wide-angle function. It helps to effectively control optical distortion and achieve a low-distortion imaging effect. It can also reduce the incident height of light and avoid large-angle deflection of light, which is conducive to correcting aberrations and reducing tolerance sensitivity.

[0019] In the wide-angle lens with a large image plane of the present invention, the fifth lens, the sixth lens and the seventh lens form a triplet lens, or the sixth lens and the seventh lens form a doublet lens, or the sixth lens, the seventh lens and the eighth lens form a triplet lens. In this arrangement, the doublet or triplet lens is reasonably arranged between the aperture and the image plane, which is conducive to correcting the chromatic aberration of the wide-angle lens, ensuring the imaging quality, improving the resolution performance, and at the same time reducing the tolerance sensitivity and improving the production yield.

[0020] The half image height IH of the large image plane wide angle lens of the present invention and its field of view FOV satisfy the relationship: 2.50≤IH / tan(FOV / 2)≤4.5. Satisfying the above relationship can ensure that the optical system meets the advantages of large field of view angle and large image plane wide angle, effectively control the distortion of the optical system, and achieve wide-angle low distortion imaging effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram showing the structure of a wide-angle lens with a large image surface according to Embodiment 1 of the present invention;

[0022] Figure 2 Schematically showing the MTF diagram of the large image plane wide-angle lens according to Example 1 of the present invention;

[0023] Figure 3 Schematically showing a Through-Focus-MTF diagram of a large image plane wide angle lens at a low temperature of -40°C according to Example 1 of the present invention;

[0024] Figure 4 A Through-Focus-MTF diagram of a large image plane wide-angle lens at a high temperature of 85° C. according to Example 1 of the present invention is schematically shown;

[0025] Figure 5 A schematic diagram showing the structure of a wide-angle lens with a large image surface according to Embodiment 2 of the present invention;

[0026] Figure 6 Schematically showing the MTF diagram of the large image plane wide-angle lens according to Example 2 of the present invention;

[0027] Figure 7 Schematically showing a Through-Focus-MTF diagram of a large image plane wide-angle lens at a low temperature of -40°C according to Example 2 of the present invention;

[0028] Figure 8 A Through-Focus-MTF diagram of a large image plane wide-angle lens at a high temperature of 85° C. according to Example 2 of the present invention is schematically shown;

[0029] Fig. 9 A schematic diagram showing the structure of a wide-angle lens with a large image surface according to Embodiment 3 of the present invention;

[0030] Fig.10 Schematically showing the MTF diagram of the wide-angle lens with a large image surface according to Example 3 of the present invention;

[0031] Fig.11 A Through-Focus-MTF diagram of a large image plane wide-angle lens at a low temperature of -40°C according to Example 3 of the present invention is schematically shown;

[0032] Fig.12 A Through-Focus-MTF diagram of a large image plane wide-angle lens at a high temperature of 85° C. according to Example 3 of the present invention is schematically shown;

[0033] Fig.13 A schematic diagram showing the structure of a wide-angle lens with a large image surface according to Embodiment 4 of the present invention;

[0034] Fig.14 Schematically showing an MTF diagram of a wide-angle lens with a large image surface according to Embodiment 4 of the present invention;

[0035] Fig.15 A Through-Focus-MTF diagram of a large image plane wide-angle lens at a low temperature of -40°C according to Example 4 of the present invention is schematically shown;

[0036] Fig.16 The Through-Focus-MTF diagram of the large image plane wide-angle lens at a high temperature of 85° C. according to Example 4 of the present invention is schematically shown. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0039] Figure 1 FIG. 2 is a schematic diagram showing the structure of a large image plane wide-angle lens according to an embodiment of the present invention. Figure 1 As shown, the wide-angle lens with a large image area of ​​the present invention comprises: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9 and a tenth lens L10 arranged in sequence from the object side to the image side along the optical axis. In the present invention, the first lens L1, the second lens L2, the fifth lens L5 and the seventh lens L7 are negative power lenses; the third lens L3, the fourth lens L4, the sixth lens L6, the eighth lens L8, the ninth lens L9 and the tenth lens L10 are positive power lenses.

[0040] The wide-angle lens with a large image area of ​​the present invention can receive incident light at a large angle by arranging the lenses as described above and by properly placing and matching the positive power lenses and the negative power lenses. It also allows the incident light to sequentially pass through each optical deflection surface at a smaller angle, which is beneficial for correcting aberrations and improving resolution performance, and is also beneficial for reducing tolerance sensitivity.

[0041] In the present invention, along the direction from the object side to the image side, the first lens L1, the second lens L2 and the fifth lens L5 are convex-concave lenses; the sixth lens L6, the eighth lens L8 and the ninth lens L9 are biconvex lenses; the third lens L3 is a concave-convex lens, and the seventh lens L7 is a biconcave lens. With such an arrangement, the bending direction and shape of these lenses at specific positions of the entire lens system can accommodate large-angle incident light and achieve a wide-angle function. This helps to effectively control optical distortion and achieve a low-distortion imaging effect. It can also reduce the incident height of light to avoid large-angle deflection of light, which is beneficial to correct aberrations and reduce tolerance sensitivity.

[0042] In the present invention, the fifth lens L5, the sixth lens L6 and the seventh lens L7 form a triplet lens, or the sixth lens L6 and the seventh lens L7 form a doublet lens, or the sixth lens L6, the seventh lens L7 and the eighth lens L8 form a triplet lens. Such an arrangement allows the doublet or triplet lens to be properly arranged between the aperture and the image plane, which is beneficial to correcting the chromatic aberration of the wide-angle lens, ensuring the imaging quality, improving the resolution performance, and at the same time reducing the tolerance sensitivity and improving the production yield.

[0043] In the present invention, the refractive index of the fifth lens L5 is Nd5, and the Abbe number is Vd5, which satisfies: 1.75≤Nd5≤1.95, 20.00≤Vd5≤26.00. When the refractive index and the Abbe number of the material used for the fifth lens L5 satisfy the above relationship, it is beneficial to correct the aberration of the wide-angle lens with a large image plane in a limited space and ensure the imaging quality.

[0044] In the present invention, the refractive index of the sixth lens L6 is Nd6, and the Abbe number is Vd6, which satisfies: 1.40≤Nd6≤1.60, 65.00≤Vd6≤96.00. When the refractive index and the Abbe number of the material used for the sixth lens L6 satisfy the above relationship, it is beneficial to correct the chromatic aberration of the wide-angle lens and ensure the resolution performance. It can maintain the stability of the effective focal length of the lens in different temperature environments, realize the automatic temperature compensation function, and ensure the imaging quality in different temperature environments.

[0045] In the present invention, the refractive index of the seventh lens L7 is Nd7, and the Abbe number is Vd7, which satisfies: 1.60≤Nd7≤1.80, 25.00≤Vd7≤35.00. When the refractive index and the Abbe number of the material used for the seventh lens L7 satisfy the above relationship, it is beneficial to correct the chromatic aberration of the wide-angle lens and ensure the resolution performance.

[0046] In the present invention, the refractive index of the eighth lens L8 is Nd8, and the Abbe number is Vd8, which satisfies: 1.40≤Nd8≤1.60, 65.00≤Vd8≤96.00. When the refractive index and the Abbe number of the material used in the eighth lens L8 satisfy the above relationship, it is beneficial to correct the chromatic aberration of the wide-angle lens and ensure the resolution performance. It can maintain the stability of the effective focal length of the lens in different temperature environments, realize the automatic temperature compensation function, and ensure the imaging quality in different temperature environments.

[0047] In the present invention, the second lens L2, the third lens L3, the ninth lens L9 and the tenth lens L10 are aspherical lenses, and the remaining lenses are spherical lenses. Thus, by designing and using plastic non-curved lenses at specific positions, various optical aberrations of a wide-angle lens with a large image plane can be corrected to a great extent, the resolution performance can be improved, and the high-definition imaging requirements of tens of millions of pixels can be met. At the same time, it can cooperate and complement with spherical lenses made of other glass materials, maintain the stability of the effective focal length of the lens in different temperature environments, realize the automatic temperature compensation function, and ensure the imaging quality in different temperature environments.

[0048] The half image height IH of the large image plane wide angle lens of the present invention and its field of view FOV satisfy the relationship: 2.50≤IH / tan(FOV / 2)≤4.5. Satisfying the above relationship can ensure that the optical system meets the advantages of large field of view angle and large image plane wide angle, effectively control the distortion of the optical system, and achieve wide-angle low distortion imaging effect.

[0049] The effective focal length of the wide-angle lens with a large image plane of the present invention is f, and the axial distance from the optical surface of the tenth lens L10 close to the image plane to the image plane is BFL, which satisfies the relationship: 0.35≤(1.25*f-BFL) / BFL≤0.45. In this way, under the premise of satisfying the effective focal length of the system, there is sufficient space from the optical surface of the tenth lens L10 close to the image plane to the image plane, and a filter element can be placed to effectively filter out the influence of the non-visible spectrum, ensuring high-definition imaging quality.

[0050] Four groups of specific implementations are given below based on the above-mentioned configuration of the present invention to specifically illustrate the glass-plastic hybrid lens according to the present invention. Because the large image plane wide-angle lens according to the present invention has a total of 10 lenses, each lens has two optical surfaces, plus the aperture S, the imaging surface IMA of the lens, and the surface of the flat filter IR between the imaging surface IMA and the lens, when there is a double cemented lens in the 10 lenses, there are at most 23 optical surfaces. For the convenience of description, the surfaces are numbered from S1 to S23.

[0051] The six groups of implementation data are shown in Table 1 below:

[0052] Conditional expression Example 1 Example 2 Example 3 Example 4 2.50≤IH / tan(FOV / 2)≤3.55 3.53 3.20 2.89 2.58 1.75≤Nd5≤1.95 1.92 1.85 1.81 1.78 20.00≤Vd5≤26.00 20.88 23.78 25.46 25.72 1.40≤Nd6≤1.60 1.59 1.50 1.46 1.44 65.00≤Vd6≤96.00 68.62 81.61 90.19 95.10 1.60≤Nd7≤1.80 1.76 1.74 1.70 1.67 25.00≤Vd7≤35.00 26.61 27.76 30.05 33.05 1.40≤Nd8≤1.60 1.44 1.46 1.50 1.59 65.00≤Vd8≤96.00 95.10 90.19 81.61 68.62 0.35≤(1.25*f-BFL) / BFL≤0.45 0.36 0.39 0.43 0.45

[0053] Implementation method 1:

[0054] Figure 1 FIG. 1 is a diagram schematically showing the structure of a wide-angle lens with a large image surface according to a first embodiment of the present invention.

[0055] In the first embodiment, the effective focal length of the wide-angle lens with a large image plane is f=5.65 mm, the aperture value FN0=2.25, and the half field angle FOV / 2=66.0°. The sixth lens L6 and the seventh lens L7 form a doublet lens.

[0056] 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:

[0057] Surface number Surface type Radius of curvature thickness Refractive Index Abbe number S1 Spherical 22.15 1.20 1.92 20.9 S2 Spherical 11.18 5.24 S3 Aspheric 13.00 2.50 1.54 55.7 S4 Aspheric 4.85 10.59 S5 Aspheric -8.59 3.50 1.53 56.1 S6 Aspheric -9.68 0.10 S7 Spherical 14.37 2.56 1.90 31.4 S8 Spherical 298.60 6.26 S9(STOP) Spherical Infinity 0.61 S10 Spherical 15.79 2.77 1.92 20.9 S11 Spherical 9.83 0.16 S12 Spherical 11.74 2.52 1.59 68.6 S13 Spherical -5.22 0.80 1.76 26.6 S14 Spherical 34.91 0.20 S15 Spherical 25.00 2.99 1.44 95.1 S16 Spherical -9.79 0.10 S17 Aspheric 35.00 3.00 1.53 56.1 S18 Aspheric -29.05 1.39 S19 Aspheric 22.68 3.50 1.53 56.1 S20 Aspheric 21.92 2.09 S21 Spherical Infinity 0.80 1.52 64.2 S22 Spherical Infinity 2.12 S23 (image plane) Spherical Infinity -

[0058] Table 2

[0059] In this embodiment, the aspheric surface data are shown in Table 3 below, where K is the quadratic surface constant of the surface, and A, B, C, D, and E are the aspheric surface coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, and sixteenth order, respectively:

[0060] Surface number K A B C D E S3 0.03 3.42E-5 -8.81E-6 8.00E-8 -5.79E-10 8.13E-13 S4 -0.69 2.73E-4 -2.93E-5 -5.84E-9 5.22E-9 -5.94E-11 S5 -0.70 2.09E-4 -3.85E-6 2.72E-8 -2.03E-10 -5.75E-14 S6 -0.94 4.18E-6 -2.23E-6 8.60E-9 -5.91E-11 5.34E-13 S17 4.74 -3.85E-4 3.92E-6 -3.92E-7 2.16E-8 -8.68E-11 S18 -20.00 -8.01E-4 5.78E-6 -2.75E-8 2.24E-9 3.42E-11 S19 3.78 -6.76E-4 -2.17E-5 4.17E-7 -3.72E-10 -3.83E-11 S20 -6.85 2.69E-4 -3.94E-5 7.67E-7 -8.17E-9 3.77E-11

[0061] Table 3

[0062] Figure 2-4 They are respectively schematic diagrams showing the MTF performance of the large image plane wide angle lens of Example 1, the -40°C Through-Focus-MTF performance diagram, and the +85°C Through-Focus-MTF performance diagram. Figures 2 to 4 It can be seen that the lens of this embodiment has both wide-angle and low distortion performance, with a half field angle greater than 60°. It also has an automatic temperature compensation function and is not out of focus within a temperature range of -40°C to 85°C.

[0063] Implementation method 2:

[0064] Figure 5 FIG. 1 is a diagram schematically showing the structure of a wide-angle lens with a large image surface according to a second embodiment of the present invention.

[0065] In the second embodiment, the effective focal length of the large image plane wide-angle lens is f=5.64 mm, the aperture value FN0=2.30, and the half field angle FOV / 2=68°. The fifth lens L5, the sixth lens L6 and the seventh lens L7 form a triplet lens.

[0066] Table 4 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:

[0067] surface Surface type Radius of curvature thickness Refractive Index Abbe number S1 Spherical 22.23 1.22 1.92 20.9 S2 Spherical 11.18 5.26 S3 Aspheric 13.05 2.48 1.54 55.7 S4 Aspheric 4.85 10.57 S5 Aspheric -8.67 3.60 1.53 56.1 S6 Aspheric -9.78 0.10 S7 Spherical 13.68 2.59 1.90 31.4 S8 Spherical 140.55 6.25 S9(STOP) Spherical Infinity 0.67 S10 Spherical 18.23 2.82 1.85 23.8 S11 Spherical 11.51 2.55 1.50 81.6 S12 Spherical -5.15 0.80 1.74 27.8 S13 Spherical 33.06 0.26 S14 Spherical 28.33 3.05 1.46 90.2 S15 Spherical -9.69 0.12 S16 Aspheric 35.73 2.99 1.53 56.1 S17 Aspheric -30.57 1.22 S18 Aspheric 22.71 3.45 1.53 56.1 S19 Aspheric 21.87 2.09 S20 Spherical Infinity 0.80 1.52 64.2 S21 Spherical Infinity 2.11 S22 (image plane) Spherical Infinity -

[0068] Table 4

[0069] In this embodiment, the aspheric surface data are shown in Table 5 below, where K is the quadratic surface constant of the surface, and A, B, C, D, and E are the aspheric surface coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, and sixteenth order, respectively:

[0070] Surface number K A B C D E S3 0.03 3.54E-5 -8.80E-6 8.00E-8 -5.79E-10 8.12E-13 S4 -0.69 2.73E-4 -2.93E-5 -6.37E-9 5.21E-9 -5.94E-11 S5 -0.70 2.08E-4 -3.86E-6 2.72E-8 -8.76E-11 4.65E-15 S6 -0.94 4.08E-6 -2.22E-6 8.75E-9 -5.95E-11 5.80E-13 S16 3.48 -3.90E-4 3.89E-6 -3.93E-7 2.16E-8 -8.52E-11 S17 -21.23 -8.00E-4 5.78E-6 -2.59E-8 2.28E-9 3.47E-11 S18 3.78 -6.77E-4 -2.17E-5 4.16E-7 -4.03E-10 -5.83E-11 S19 -7.35 2.65E-4 -3.94E-5 7.66E-7 -8.17E-9 3.76E-11

[0071] Table 5

[0072] Figure 6-8 They are respectively schematic diagrams showing the MTF performance of the large image plane wide-angle lens of Example 2, the -40°C Through-Focus-MTF performance diagram, and the +85°C Through-Focus-MTF performance diagram. Figures 6 to 8 It can be seen that the lens of this embodiment has both wide-angle and low distortion performance, with a half field angle greater than 60°. It also has an automatic temperature compensation function and is not out of focus within a temperature range of -40°C to 85°C.

[0073] Implementation method three:

[0074] Fig. 9 FIG. 1 is a diagram schematically showing the structure of a wide-angle lens with a large image surface according to a third embodiment of the present invention.

[0075] In the third embodiment, the effective focal length of the wide-angle lens with a large image plane is f=5.66 mm, the aperture value FN0=2.35, and the half field angle FOV / 2=70°. The sixth lens L6, the seventh lens L7 and the eighth lens L8 form a triplet lens.

[0076] 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:

[0077]

[0078]

[0079] Table 6

[0080] In this embodiment, the aspheric surface data are shown in Table 7 below, where K is the quadratic surface constant of the surface, and A, B, C, D, and E are the aspheric surface coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, and sixteenth order, respectively:

[0081] Surface number K A B C D E S3 0.03 3.44E-5 -8.82E-6 8.00E-8 -5.79E-10 8.11E-13 S4 -0.70 2.73E-4 -2.93E-5 -5.99E-9 5.21E-9 -5.96E-11 S5 -0.68 2.05E-4 -3.89E-6 2.74E-8 -6.04E-11 -7.98E-13 S6 -0.93 3.67E-6 -2.23E-6 9.17E-9 -5.99E-11 5.88E-13 S16 4.99 -3.74E-4 4.23E-6 -3.88E-7 2.17E-8 -2.05E-10 S17 -19.04 -8.12E-4 5.54E-6 -2.53E-8 2.23E-9 2.70E-11 S18 3.76 -6.76E-4 -2.17E-5 4.13E-7 -4.51E-10 -5.81E-11 S19 -9.63 2.54E-4 -3.95E-5 7.67E-7 -8.15E-9 3.82E-11

[0082] Table 7

[0083] Figure 10-12 They are respectively schematic diagrams showing the MTF performance of the large image plane wide-angle lens of Example 3, the -40°C Through-Focus-MTF performance diagram, and the +85°C Through-Focus-MTF performance diagram. Figures 10 to 12 It can be seen that the lens of this embodiment has both wide-angle and low distortion performance, with a half field angle greater than 60°. It also has an automatic temperature compensation function and is not out of focus within a temperature range of -40°C to 85°C.

[0084] Implementation method 4:

[0085] Fig.13 FIG. 1 is a diagram schematically showing the structure of a wide-angle lens with a large image surface according to a fourth embodiment of the present invention.

[0086] In the fourth embodiment, the effective focal length of the wide-angle lens with a large image plane is f=5.63 mm, the aperture value FN0=2.40, and the half field angle FOV / 2=72°. The sixth lens L6 and the seventh lens L7 form a doublet lens.

[0087] 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:

[0088]

[0089]

[0090] Table 8

[0091] In this embodiment, the aspheric surface data are shown in Table 9 below, where K is the quadratic surface constant of the surface, and A, B, C, D, and E are the aspheric surface coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, and sixteenth order, respectively:

[0092] Surface number K A B C D E S3 0.03 3.42E-5 -8.80E-6 8.01E-8 -5.78E-10 8.16E-13 S4 -0.69 2.90E-4 -2.92E-5 -5.78E-9 5.22E-9 -5.87E-11 S5 -0.54 9.26E-5 -4.39E-6 9.93E-9 -4.70E-10 9.13E-12 S6 -1.06 2.39E-5 -2.43E-6 -7.31E-9 2.70E-10 8.76E-13 S17 3.79 -3.88E-4 3.80E-6 -3.93E-7 2.17E-8 -8.40E-11 S18 -23.22 -7.89E-4 6.03E-6 -2.44E-8 2.26E-9 3.42E-11 S19 3.56 -6.91E-4 -2.16E-5 4.21E-7 -2.86E-10 -3.72E-11 S20 -8.29 2.55E-4 -3.97E-5 7.65E-7 -8.16E-9 3.85E-11

[0093] Table 9

[0094] Figure 13-16 They are respectively schematic diagrams showing the MTF performance of the large image plane wide angle lens of Example 4, the -40°C Through-Focus-MTF performance diagram, and the +85°C Through-Focus-MTF performance diagram. Figures 13 to 16 It can be seen that the lens of this embodiment has both wide-angle and low distortion performance, with a half field angle greater than 60°. It also has an automatic temperature compensation function and is not out of focus within a temperature range of -40°C to 85°C.

[0095] The above is only one embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wide-angle lens with a large image area, comprising a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), an aperture, a fifth lens (L5), a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), a ninth lens (L9) and a tenth lens (L10) arranged in sequence from the object side to the image side along the optical axis, characterized in that: The first lens (L1), the second lens (L2), the fifth lens (L5) and the seventh lens (L7) are negative power lenses; The third lens (L3), the fourth lens (L4), the sixth lens (L6), the eighth lens (L8), the ninth lens (L9) and the tenth lens (L10) are positive power lenses.

2. The large image wide-angle lens according to claim 1, characterized in that: Along the direction from the object side to the image side, the first lens (L1), the second lens (L2) and the fifth lens (L5) are convex-concave lenses; The sixth lens (L6), the eighth lens (L8) and the ninth lens (L9) are biconvex lenses; The third lens (L3) is a meniscus lens, and the seventh lens (L7) is a biconcave lens.

3. The large image wide-angle lens according to claim 1 or 2, characterized in that: The fifth lens (L5), the sixth lens (L6) and the seventh lens (L7) form a triplet lens, or the sixth lens (L6) and the seventh lens (L7) form a doublet lens, or the sixth lens (L6), the seventh lens (L7) and the eighth lens (L8) form a triplet lens.

4. The large image area wide angle lens according to claim 3, characterized in that: The refractive index of the fifth lens (L5) is Nd5, and the Abbe number is Vd5, which satisfies: 1.75≤Nd5≤1.95, 20.00≤Vd5≤26.

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5. The large image wide-angle lens according to claim 3, characterized in that: The refractive index of the sixth lens (L6) is Nd6, and the Abbe number is Vd6, which satisfies: 1.40≤Nd6≤1.60, 65.00≤Vd6≤96.

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6. The large image wide-angle lens according to claim 3, characterized in that: The refractive index of the seventh lens (L7) is Nd7, and the Abbe number is Vd7, which satisfies: 1.60≤Nd7≤1.80, 25.00≤Vd7≤35.

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7. The large image wide-angle lens according to claim 3, characterized in that: The refractive index of the eighth lens (L8) is Nd8, and the Abbe number is Vd8, which satisfies: 1.40≤Nd8≤1.60, 65.00≤Vd8≤96.

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8. The large image wide-angle lens according to claim 1 or 2, characterized in that: The second lens (L2), the third lens (L3), the ninth lens (L9) and the tenth lens (L10) are aspherical lenses.

9. The large image wide-angle lens according to claim 1, characterized in that: The half image height IH of the large image wide-angle lens and the field of view FOV of the large image wide-angle lens satisfy the relationship: 2.50≤IH / tan(FOV / 2)≤4.

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10. The large image wide angle lens according to claim 1, characterized in that: The effective focal length of the large image wide-angle lens is f, and the axial distance from the optical surface of the tenth lens (L10) close to the image plane to the image plane is BFL, which satisfies the relationship: 0.35≤(1.25*f-BFL) / BFL≤0.45.

Images