wide-angle lens

Abstract

A wide-angle lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has a refractive power, the first lens includes a concave surface facing an image side. The second lens has a refractive power, the second lens is a meniscus lens, and includes a concave surface facing an object side and a convex surface facing the image side. The third lens has a positive refractive power. The fourth lens has a refractive power. The fifth lens has a negative refractive power. The sixth lens has a positive refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged in order from the object side to the image side along an optical axis.

Description

Technical Field

[0001] This invention relates to a wide-angle lens. Background Technology

[0002] The current trend in wide-angle lens development is not only towards a larger field of view, but also requires large aperture and high resolution to meet different application needs. Existing wide-angle lenses can no longer meet current needs, so a new architecture of wide-angle lens is needed to simultaneously satisfy the requirements of a large field of view, large aperture and high resolution. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a wide-angle lens that has a large field of view, a small aperture and a high resolution, while still having good optical performance, in order to address the shortcomings of existing wide-angle lenses that cannot simultaneously meet the requirements of a large field of view, a large aperture and a high resolution.

[0004] The technical solution adopted by this invention to solve its technical problem is to provide a wide-angle lens, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has refractive power and includes a concave surface facing the image side. The second lens has refractive power; this second lens is a meniscus lens and includes a concave surface facing the object side and a convex surface facing the image side. The third lens has positive refractive power. The fourth lens has refractive power. The fifth lens has negative refractive power. The sixth lens has positive refractive power. The first, second, third, fourth, fifth, and sixth lenses are arranged sequentially along the optical axis from the object side to the image side.

[0005] The wide-angle lens of the present invention may further include a seventh lens disposed between the fourth lens and the fifth lens.

[0006] The seventh lens is a biconvex lens with positive refractive power, and includes one convex surface facing the object side and another convex surface facing the image side.

[0007] The first lens has negative refractive power and may further include a convex surface facing the object side.

[0008] The second lens has negative refractive power.

[0009] The fourth lens is a biconvex lens with positive refractive power, and includes one convex surface facing the object side and another convex surface facing the image side.

[0010] The third lens is a biconvex lens, comprising one convex surface facing the object side and another convex surface facing the image side.

[0011] The fifth lens is a biconcave lens, comprising one concave surface facing the object side and another concave surface facing the image side.

[0012] The sixth lens is a biconvex lens, comprising one convex surface facing the object side and another convex surface facing the image side.

[0013] The wide-angle lens must satisfy at least one of the following conditions: -7.2≤f1 / f≤-0.4; 0.8≤|f2 / f|≤6.9; 0.2≤f3 / f≤3.4; 0.2≤|f4 / f|≤3.4; 0.5≤f6 / f≤3.7; 1.7≤f7 / f≤4.5; 0.1≤BFL / TTL≤0.6; 4≤(R61-R62) / (R61+R62)≤10; -11≤R11 / R22≤-0.4; -4≤T12 / (CT1-CT2)≤-2; -8≤R41 / R42≤-1; -0.9≤f12 / f3456≤-0.7; where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f is the effective focal length of the wide-angle lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. Effective focal length, TTL is the distance along the optical axis from the object side of the first lens to the image plane, BFL is the distance along the optical axis from the image side of the sixth lens to the image plane, R61 is the radius of curvature of the object side of the sixth lens, R62 is the radius of curvature of the image side of the sixth lens, R11 is the radius of curvature of the object side of the first lens, R22 is the radius of curvature of the image side of the second lens, T12 is the distance along the optical axis from the image side of the first lens to the object side of the second lens, CT1 is the distance along the optical axis from the object side of the first lens to the image side of the first lens, CT2 is the distance along the optical axis from the object side of the second lens to the image side of the second lens, R41 is the radius of curvature of the object side of the fourth lens, R42 is the radius of curvature of the image side of the fourth lens, f12 is the combined effective focal length of the first and second lenses, and f3456 is the combined effective focal length of the third, fourth, fifth, and sixth lenses.

[0014] The wide-angle lens implementing the present invention has the following effects: it has a large field of view, a small aperture value, and a high resolution, but still has good optical performance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the lens configuration according to a first embodiment of the wide-angle lens of the present invention.

[0016] Figure 2A , 2B 2C and 2C are respectively the longitudinal aberration diagram, field curvature diagram, and distortion diagram of the first embodiment of the wide-angle lens according to the present invention.

[0017] Figure 3This is a schematic diagram of the lens configuration according to a third embodiment of the wide-angle lens of the present invention.

[0018] Figure 4A , 4B 4C, 4D, 4E, 4F, and 4G are respectively the longitudinal aberration diagram, field curvature diagram, distortion diagram, lateral color aberration diagram, relative illumination diagram, modulation transfer function diagram, and through-focus modulation transfer function diagram of the third embodiment of the wide-angle lens according to the present invention.

[0019] Figure 5 This is a schematic diagram of the lens configuration according to the fifth embodiment of the wide-angle lens of the present invention.

[0020] Figure 6A , 6B 6C, 6D, and 6E are respectively the longitudinal aberration diagram, field curvature diagram, distortion diagram, lateral chromatic aberration diagram, and modulation conversion function diagram of the fifth embodiment of the wide-angle lens according to the present invention.

[0021] Figure 7 This is a schematic diagram of the lens configuration according to the sixth embodiment of the wide-angle lens of the present invention.

[0022] Figure 8A , 8B 8C, 8D, and 8E are respectively the longitudinal aberration diagram, field curvature diagram, distortion diagram, lateral chromatic aberration diagram, and modulation conversion function diagram of the sixth embodiment of the wide-angle lens according to the present invention.

[0023] Figure 9 This is a schematic diagram of the lens configuration according to the seventh embodiment of the wide-angle lens of the present invention.

[0024] Figure 10A , 10B 10C, 10D, and 10E are respectively the longitudinal aberration diagram, field curvature diagram, distortion diagram, lateral chromatic aberration diagram, and modulation conversion function diagram of the seventh embodiment of the wide-angle lens according to the present invention. Detailed Implementation

[0025] The present invention provides a wide-angle lens, comprising: a first lens having refractive power, the first lens including a concave surface facing an image side; a second lens having refractive power, the second lens being a meniscus lens, and including a concave surface facing an object side and a convex surface facing an image side; a third lens having positive refractive power; a fourth lens having refractive power; a fifth lens having negative refractive power; and a sixth lens having positive refractive power; wherein the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens are arranged sequentially from the object side to the image side along the optical axis.

[0026] Please refer to Tables 1, 2, 4, 5, 7, 8, 10, and 11 below. Tables 1, 4, 7, and 10 are parameter tables for each lens according to the first to fourth embodiments of the wide-angle lens of the present invention. Tables 2, 5, 8, and 11 are parameter tables for the aspherical surface of the aspherical lens in Tables 1, 4, 7, and 10. In the following embodiments, the aspherical surface concavity z of the aspherical lens is obtained by the following formula: z = ch 2 / {1+[1-(k+1)c 2 h 2 ] 1 / 2}+Ah 4 +Bh 6 +Ch 8 Where: c is the curvature, h is the perpendicular distance from any point on the lens surface to the optical axis, k is the conic constant, A to C are the aspherical coefficients, and E represents the scientific notation, such as E-03 indicating 10. -3 .

[0027] Figure 1 , 3 The first and third embodiments of the wide-angle lens of the present invention are shown as lens configuration diagrams. The lens configuration diagrams of the second and fourth embodiments of the wide-angle lens are similar to those of the first and third embodiments, and therefore their diagrams are omitted. However, the component symbols of the second and fourth embodiments will continue to be used for ease of explanation in the following content concerning the second and fourth embodiments. Among them, the first lenses L11, L21, L31, and L41 are meniscus lenses with negative refractive power, made of glass. Their object-side surfaces S11, S21, S31, and S41 are convex, and their image-side surfaces S12, S22, S32, and S42 are concave. The object-side surfaces S11, S21, S31, and S41 and the image-side surfaces S12, S22, S32, and S42 are all spherical surfaces.

[0028] The second lenses L12, L22, L32, and L42 are meniscus lenses with negative refractive power, made of glass. Their object-side surfaces S13, S23, S33, and S43 are concave, while their image-side surfaces S14, S24, S34, and S44 are convex. Both the object-side surfaces S13, S23, S33, and S43 and the image-side surfaces S14, S24, S34, and S44 are spherical surfaces.

[0029] The third lenses L13, L23, L33, and L43 are biconvex lenses with positive refractive power, made of glass. Their object-side surfaces S16, S26, S36, and S46 are convex, and their image-side surfaces S17, S27, S37, and S47 are convex. The object-side surfaces S16, S26, S36, and S46, as well as the image-side surfaces S17, S27, S37, and S47, are all aspherical surfaces.

[0030] The fourth lenses L14, L24, L34, and L44 are biconvex lenses with positive refractive power. They are made of glass, with the object-side surfaces S18, S28, S38, and S48 being convex and the image-side surfaces S19, S29, S39, and S49 being convex. The object-side surfaces S18, S28, S38, and S48, as well as the image-side surfaces S19, S29, S39, and S49, are all spherical surfaces.

[0031] The fifth lenses L15, L25, L35, and L45 are biconcave lenses with negative refractive power, made of glass. Their object-side surfaces S110, S210, S312, and S412 are concave, and their image-side surfaces S111, S211, S313, and S413 are concave. Both the object-side surfaces S110, S210, S312, and S412 and the image-side surfaces S111, S211, S313, and S413 are spherical surfaces.

[0032] The sixth lenses L16, L26, L36, and L46 are biconvex lenses with positive refractive power, made of glass. Their object-side surfaces S112, S212, S314, and S414 are convex, and their image-side surfaces S113, S213, S315, and S415 are convex. The object-side surfaces S112, S212, S314, and S414, as well as the image-side surfaces S113, S213, S315, and S415, are all aspherical surfaces.

[0033] In addition, wide-angle lenses 1, 2, 3, and 4 must meet at least one of the following conditions:

[0034] -7.2 ≤ f1 / f ≤ -0.4; (1)

[0035] 0.8 ≤ |f² / f| ≤ 6.9; (2)

[0036] 0.2 ≤ f3 / f ≤ 3.4; (3)

[0037] 0.2 ≤∣f4 / f∣≤ 3.4; (4)

[0038] 0.5 ≤ f6 / f ≤ 3.7; (5)

[0039] 1.7 ≤ f7 / f ≤ 4.5; (6)

[0040] 0.1 ≤ BFL / TTL ≤ 0.6; (7)

[0041] 4 ≤ (R61-R62) / (R61+R62) ≤ 10; (8)

[0042] -11 ≤ R11 / R22 ≤ -0.4; (9)

[0043] -4 ≤ T12 / (CT1-CT2) ≤ -2; (10)

[0044] -8 ≤ R41 / R42 ≤ -1; (11)

[0045] -0.9 ≤ f12 / f3456 ≤ -0.7; (12)

[0046] 4.7 ≤ TTL / f ≤ 4.9; (13)

[0047] 0.06 ≤ TTL / R11 ≤ 0.66; (14)

[0048] -1.03 ≤ TTL / R22 ≤ -0.26; (15)

[0049] Vd3 > 35; (16)

[0050] Wherein, f represents the effective focal length of wide-angle lenses 1, 2, 3, and 4 in the first to fourth embodiments; f1 represents the effective focal length of the first lenses L11, L21, L31, and L41 in the first to fourth embodiments; f2 represents the effective focal length of the second lenses L12, L22, L32, and L42 in the first to fourth embodiments; f3 represents the effective focal length of the third lenses L13, L23, L33, and L43 in the first to fourth embodiments; f4 represents the effective focal length of the fourth lenses L14, L24, L34, and L44 in the first to fourth embodiments; f6 represents the effective focal length of the sixth lenses L16, L26, L36, and L46 in the first to fourth embodiments; and f7 represents the effective focal length of the first embodiment. In embodiments one through four, the effective focal lengths of the seventh lenses L17, L27, L37, and L47 are: f12 is the combined effective focal length of the first lenses L11, L21, L31, and L41 and the second lenses L12, L22, L32, and L42 in embodiments one through four; f3456 is the combined effective focal length of the third lenses L13, L23, L33, and L43, the fourth lenses L14, L24, L34, and L44, the fifth lenses L15, L25, L35, and L45, and the sixth lenses L16, L26, L36, and L46 in embodiments one through four; and TTL is the object-side surface S1 of the first lenses L11, L21, L31, and L41 in embodiments one through four. 1. S21, S31, and S41 are the distances from the imaging surfaces IMA1, IMA2, IMA3, and IMA4 along the optical axes OA1, OA2, OA3, and OA4, respectively. BFL is the distance from the image-side surfaces S113, S213, S315, and S415 of the sixth lenses L16, L26, L36, and L46 to the imaging surfaces IMA1, IMA2, IMA3, and IMA4 along the optical axes OA1, OA2, OA3, and OA4, respectively, in the first to fourth embodiments. R11 is the radius of curvature of the object-side surfaces S11, S21, S31, and S41 of the first lenses L11, L21, L31, and L41 in the first to fourth embodiments. R22 is the radius of curvature of the first lens L11, L21, L31, and L41 in the first to fourth embodiments. The radii of curvature of the image-side surfaces S14, S24, S34, and S44 of lenses L12, L22, L32, and L42; R41 is the radius of curvature of the object-side surfaces S18, S28, S38, and S48 of lenses L14, L24, L34, and L44 in the first to fourth embodiments; R42 is the radius of curvature of the image-side surfaces S19, S29, S39, and S49 of lenses L14, L24, L34, and L44 in the first to fourth embodiments; R61 is the radius of curvature of the object-side surfaces S112, S212, S314, and S414 of lenses L16, L26, L36, and L46 in the first to fourth embodiments; R62 is the radius of curvature of the object-side surfaces S112, S212, S314, and S414 of lenses L16, L26, L36, and L46 in the first to fourth embodiments.The radii of curvature of the image-side surfaces S113, S213, S315, and S415 of the sixth lenses L16, L26, L36, and L46; T12 represents the distance along the optical axes OA1, OA2, OA3, and OA4 from the image-side surfaces S12, S22, S32, and S42 of the first lenses L11, L21, L31, and L41 to the object-side surfaces S13, S23, S33, and S43 of the second lenses L12, L22, L32, and L42, respectively, in the first to fourth embodiments; CT1 represents the distance along the optical axes OA1, OA2, OA3, and OA4 from the image-side surfaces S12, S22, S31, and S42 of the first lenses L11, L21, L31, and L415 in the first to fourth embodiments. The distances from the object-side surfaces S11, S21, S31, and S41 of the first lenses L11, L21, L31, and L41 to the image-side surfaces S12, S22, S32, and S42 along the optical axes OA1, OA2, OA3, and OA4, respectively, are given by CT2. In the first to fourth embodiments, CT2 represents the distances from the object-side surfaces S13, S23, S33, and S43 of the second lenses L12, L22, L32, and L42 to the image-side surfaces S14, S24, S34, and S44 along the optical axes OA1, OA2, OA3, and OA4, respectively, are given by CT2. Vd3 represents the Abbe coefficients of the third lenses L13, L23, L33, and L43 in the first to fourth embodiments. This allows the wide-angle lenses 1, 2, 3, and 4 to effectively increase the field of view, effectively reduce the aperture value, effectively improve resolution, effectively correct aberrations, and effectively correct chromatic aberration.

[0051] When conditions (2) are met: 0.8≤∣f2 / f∣≤6.9 and conditions (8) are met: 4≤(R61-R62) / (R61+R62)≤10, the wide-angle lens can provide sufficient refractive power to control the field of view and help correct aberrations.

[0052] When condition (9) is met: -11≤R11 / R22≤-0.4, an appropriate radius of curvature can be used to correct the distortion.

[0053] When condition (10) is met: -4≤T12 / (CT1-CT2)≤-2, the first lens and the second lens can have appropriate thickness and spacing to correct off-axis aberrations.

[0054] When conditions (11): -8≤R41 / R42≤-1 and (12): -0.9≤f12 / f3456≤-0.7 are met, aberrations can be effectively corrected and resolution improved.

[0055] When both conditions (8): 4≤(R61-R62) / (R61+R62)≤10 and (9): -11≤R11 / R22≤-0.4 are met, the field of view can be effectively controlled and distortion can be corrected.

[0056] When conditions (13) 4.7 ≤ TTL / f ≤ 4.9 and conditions (15) -1.03 ≤ TTL / R22 ≤ -0.26 are met simultaneously, the total length of the wide-angle lens can be effectively shortened.

[0057] The first embodiment of the wide-angle lens of the present invention will now be described in detail. Please refer to... Figure 1 The wide-angle lens 1 includes a first lens L11, a second lens L12, an aperture ST1, a third lens L13, a fourth lens L14, a fifth lens L15, a sixth lens L16, an optical filter OF1, and a protective glass CG1. The first lens L11, second lens L12, aperture ST1, third lens L13, fourth lens L14, fifth lens L15, sixth lens L16, optical filter OF1, and protective glass CG1 are arranged sequentially along the optical axis OA1 from the object side to the image side. During imaging, light rays from the object side are finally imaged onto the imaging plane IMA1. According to paragraphs 1 to 8 of the [Implementation Method], wherein: the object side S114 and the image side S115 of the filter OF1 are both flat; the object side S116 and the image side S117 of the protective glass CG1 are both flat; by utilizing the above-mentioned lens, aperture ST1 and the design that satisfies at least one of the conditions (1) to (12), the wide-angle lens 1 can effectively increase the field of view, effectively reduce the aperture value, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberrations.

[0058] Table 1 is... Figure 1 Table of relevant parameters for each lens in medium wide-angle lens 1.

[0059] Table 1

[0060]

[0061]

[0062] Table 2 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 1.

[0063] Table 2

[0064] Surface serial number k A B C S16 7.8306E-01 -2.9581E-04 9.3676E-07 -2.4906E-07 S17 -2.0307E+00 8.1531E-05 -1.6270E-07 -5.0005E-08 S112 4.0433E-01 1.5994E-04 -5.9788E-06 1.8928E-07 S113 -1.8719E+00 1.9720E-04 -4.5008E-06 2.3446E-07

[0065] Table 3 shows the relevant parameter values ​​of the wide-angle lens 1 in the first embodiment and the calculated values ​​of the corresponding conditions (1) to (5) and conditions (7) to (16). As can be seen from Table 3, the wide-angle lens 1 in the first embodiment can meet the requirements of conditions (1) to (5) and conditions (7) to (16).

[0066] Table 3

[0067] BFL 9.88mm T12 4.95mm CT1 0.84mm CT2 2.14mm f12 -5.70mm f3456 7.33mm f1 / f -1.66 |f2 / f| 2.82 f3 / f 1.57 |f4 / f| 2.48 f6 / f 1.98 BFL / TTL 0.33 (R61-R62) / (R61+R62) 9.07 R11 / R22 -5.11 T12 / (CT1-CT2) -3.81 R41 / R42 -6.99 f12 / f3456 -0.78 TTL / f 4.78 Vd3 40.10 TTL / R11 0.32 TTL / R22 -1.62

[0068] Furthermore, the optical performance of the wide-angle lens 1 in the first embodiment also meets the requirements. Figure 2A It can be seen that the longitudinal aberration of the wide-angle lens 1 in the first embodiment is between -0.035mm and 0.02mm. Figure 2B It can be seen that the field curvature of the wide-angle lens 1 in the first embodiment is between -0.04mm and 0.04mm. Figure 2C It can be seen that the distortion of the wide-angle lens 1 in the first embodiment is between -7% and 0%. It is evident that the longitudinal aberration, field curvature, and distortion of the wide-angle lens 1 in the first embodiment can be effectively corrected, thereby obtaining better optical performance.

[0069] The second embodiment of the wide-angle lens of the present invention will now be described in detail. The wide-angle lens (not shown) includes a first lens L21, a second lens L22, an aperture ST2, a third lens L23, a fourth lens L24, a fifth lens L25, a sixth lens L26, a filter OF2, and a protective glass CG2. The first lens L21, the second lens L22, the aperture ST2, the third lens L23, the fourth lens L24, the fifth lens L25, the sixth lens L26, the filter OF2, and the protective glass CG2 are arranged sequentially along the optical axis OA2 from the object side to the image side. During imaging, the light rays from the object side are finally imaged onto the imaging plane IMA2. According to paragraphs 1 to 8 of the [Implementation Method], wherein: the object side S214 and the image side S215 of the filter OF2 are both flat; the object side S216 and the image side S217 of the protective glass CG2 are both flat; by utilizing the above-mentioned lens, aperture ST2 and the design that satisfies at least one of conditions (1) to (16), the wide-angle lens (not shown) can effectively increase the field of view, effectively reduce the aperture value, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberrations.

[0070] Table 4 shows the relevant parameters of each lens in the wide-angle lens (not shown).

[0071] Table 4

[0072]

[0073] Table 5 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 4.

[0074] Table 5

[0075]

[0076]

[0077] Table 6 shows the relevant parameter values ​​of the wide-angle lens 2 (not shown) in the second embodiment and the calculated values ​​of the corresponding conditions (1) to (5) and conditions (7) to (12), (13), (16). As can be seen from Table 6, the wide-angle lens 2 (not shown) in the second embodiment can meet the requirements of conditions (1) to (5) and conditions (7) to (12).

[0078] Table 6

[0079] BFL 9.59mm T12 4.75mm CT1 0.48mm CT2 2.23mm f12 -5.94mm f3456 7.40mm f1 / f -1.59 |f2 / f| 3.26 f3 / f 1.71 |f4 / f| 2.19 f6 / f 1.98 BFL / TTL 0.33 (R61-R62) / (R61+R62) 4.88 R11 / R22 -7.36 T12 / (CT1-CT2) -2.72 R41 / R42 -2.24 f12 / f3456 -0.80 TTL / R11 0.29 Vd3 40.00

[0080] In addition, the longitudinal aberration (illustration omitted), field curvature (illustration omitted), and distortion (illustration omitted) of the wide-angle lens (not shown) in the second embodiment can also be effectively corrected, thereby obtaining better optical performance.

[0081] The third embodiment of the wide-angle lens of the present invention will now be described in detail. The wide-angle lens 3 includes a first lens L31, a second lens L32, an aperture ST3, a third lens L33, a fourth lens L34, a seventh lens L37, a fifth lens L35, a sixth lens L36, a filter OF3, and a protective glass CG3. The first lens L31, the second lens L32, the aperture ST3, the third lens L33, the fourth lens L34, the seventh lens L37, the fifth lens L35, the sixth lens L36, the filter OF3, and the protective glass CG3 are arranged sequentially along the optical axis OA3 from the object side to the image side. During imaging, the light rays from the object side are finally imaged onto the imaging plane IMA3. According to paragraphs 1 to 8 of the [Specific Implementation], the seventh lens L37 is a biconvex lens with positive refractive power, made of glass, with its object side S310 being convex and its image side S311 being convex, and both the object side S310 and the image side S311 being spherical surfaces; the filter OF3 has its object side S316 and image side S317 being planar; the protective glass CG3 has its object side S318 and image side S319 being planar; by utilizing the above-mentioned lens, aperture ST3 and the design that satisfies at least one of conditions (1) to (12), the wide-angle lens 3 can effectively increase the field of view, effectively reduce the aperture value, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberration.

[0082] Table 7 shows the relevant parameters of each lens in the wide-angle lens 3.

[0083] Table 7

[0084]

[0085] Table 8 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 7.

[0086] Table 8

[0087] Surface serial number k A B C S36 103.0926 -0.00034 -4.64E-06 -4.32E-07 S37 -0.77175 0.000132 -3.16E-06 -5.36E-08 S314 -0.53351 0.000362 -3.00E-06 5.31E-09 S315 -5.48959 -0.00033 1.60E-05 -1.35E-07

[0088] Table 9 shows the relevant parameter values ​​of the wide-angle lens 3 in the third embodiment and the calculated values ​​of the corresponding conditions (1) to (9) and conditions (11) to (12), (13), and (16). As can be seen from Table 9, the wide-angle lens 3 in the third embodiment can meet the requirements of conditions (1) to (9) and conditions (11) to (12), (13), and (16).

[0089] Table 9

[0090]

[0091]

[0092] Furthermore, the optical performance of the wide-angle lens 3 in the third embodiment also meets the requirements. Figure 4A It can be seen that the longitudinal aberration of the wide-angle lens 3 in the third embodiment is between -0.02mm and 0.02mm. Figure 4B It can be seen that the field curvature of the wide-angle lens 3 in the third embodiment is between -0.03mm and 0.05mm. Figure 4C It can be seen that the distortion of the wide-angle lens 3 in the third embodiment is between -9% and 0%. Figure 4D It can be seen that the lateral chromatic aberration of the wide-angle lens 3 in the third embodiment is between -1.0 μm and 8.0 μm. Figure 4E It can be seen that the relative illumination of the wide-angle lens 3 in the third embodiment is between 0.79 and 1.0. Figure 4F It can be seen that the modulation conversion function value of the wide-angle lens 3 in the third embodiment is between 0.40 and 1.0. Figure 4G As can be seen, the modulation conversion function value of the wide-angle lens 3 in the third embodiment is between 0.0 and 0.82 when the focus shift is between -0.05mm and 0.05mm. It is evident that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 3 in the third embodiment can be effectively corrected, and the relative illumination, lens resolution, and depth of focus can also meet the requirements, thereby obtaining better optical performance.

[0093] The fourth embodiment of the wide-angle lens of the present invention will now be described in detail. The wide-angle lens (not shown) includes a first lens L41, a second lens L42, an aperture ST4, a third lens L43, a fourth lens L44, a seventh lens L47, a fifth lens L45, a sixth lens L46, a filter OF4, and a protective glass CG4. The first lens L41, the second lens L42, the aperture ST4, the third lens L43, the fourth lens L44, the seventh lens L47, the fifth lens L45, the sixth lens L46, the filter OF4, and the protective glass CG4 are arranged sequentially along the optical axis OA4 from the object side to the image side. During imaging, light rays from the object side are finally imaged onto the imaging plane IMA4. According to paragraphs 1 to 8 of the [Specific Implementation], the seventh lens L47 is a biconvex lens with positive refractive power, made of glass, with its object side S410 being convex and its image side S411 being convex, and both the object side S410 and the image side S411 being spherical surfaces; the filter OF4 has its object side S416 and image side S417 being planar; the protective glass CG4 has its object side S418 and image side S419 being planar; by utilizing the above-mentioned lens, aperture ST4 and the design that satisfies at least one of conditions (1) to (12), the wide-angle lens 4 (not shown) can effectively increase the field of view, effectively reduce the aperture value, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberration.

[0094] Table 10 shows the relevant parameters of each lens in a wide-angle lens (not shown).

[0095] Table 10

[0096]

[0097] Table 11 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 10.

[0098] Table 11

[0099] Surface serial number k A B C S46 38.48048 -0.00053 -9.63E-06 -1.46E-06 S47 -1.09676 0.000141 -3.77E-06 -1.41E-08 S414 6.457239 0.000569 3.62E-06 7.09E-08 S415 -14.8581 0.00019 3.11E-05 3.99E-08

[0100] Table 12 shows the relevant parameter values ​​of the wide-angle lens (not shown) in the fourth embodiment and the calculated values ​​of the corresponding conditions (1) to (9) and conditions (11) to (12), (13), (15), (16). As can be seen from Table 12, the wide-angle lens 4 (not shown) in the fourth embodiment can meet the requirements of conditions (1) to (9) and conditions (11) to (12), (13), (15), (16).

[0101] Table 12

[0102]

[0103]

[0104] In addition, the longitudinal aberration (illustration omitted), field curvature (illustration omitted), distortion (illustration omitted), and lateral chromatic aberration (illustration omitted) of the wide-angle lens 4 (not shown) in the fourth embodiment can also be effectively corrected, thereby obtaining better optical performance. The relative illumination (illustration omitted), modulation conversion function (illustration omitted), and defocus modulation conversion function (illustration omitted) can also meet the requirements, thereby obtaining better optical performance.

[0105] The present invention provides a wide-angle lens, comprising: a first lens having refractive power; a second lens having refractive power, the second lens including a convex surface facing an image side; a third lens having positive refractive power; an eighth lens having negative refractive power, the eighth lens including a concave surface facing an object side; a fourth lens having positive refractive power; a seventh lens having positive refractive power; a fifth lens having negative refractive power; and a sixth lens having refractive power; wherein the first lens, second lens, third lens, eighth lens, fourth lens, seventh lens, fifth lens, and sixth lens are arranged sequentially along the optical axis from the object side to the image side.

[0106] Please refer to Tables 13, 14, 16, 17, 18, and 19 below. Tables 13, 16, and 18 are parameter tables for each lens in the fifth to seventh embodiments of the wide-angle lens according to the present invention. Tables 14, 17, and 19 are parameter tables for the aspherical surfaces of the aspherical lenses in Tables 13, 16, and 18. In the following embodiments, the aspherical surface concavity z of the aspherical lens is obtained by the following formula: z = ch 2 / {1+[1-(k+1)c 2 h 2 ] 1 / 2}+Ah 4 +Bh 6 +Ch 8 Where: c is the curvature, h is the perpendicular distance from any point on the lens surface to the optical axis, k is the conic constant, A to C are the aspherical coefficients, and E represents the scientific notation, such as E-03 indicating 10. -3 .

[0107] Figure 5 , 7 Figures 9 and 1 are schematic diagrams of lens configurations in the fifth, sixth, and seventh embodiments of the wide-angle lens of the present invention, respectively. Among them, the first lenses L51, L61, and L71 are meniscus lenses with negative refractive power. Their object-side surfaces S51, S61, and S71 are convex surfaces, and their image-side surfaces S52, S62, and S72 are concave surfaces. The object-side surfaces S51, S61, and S71 and the image-side surfaces S52, S62, and S72 are all spherical surfaces.

[0108] The second lenses L52, L62, and L72 are meniscus lenses with negative refractive power. Their object-side surfaces S53, S63, and S73 are concave, while their image-side surfaces S54, S64, and S74 are convex. Both the object-side surfaces S53, S63, and S73 and the image-side surfaces S54, S64, and S74 are spherical surfaces.

[0109] The third lenses L53, L63, and L73 are biconvex lenses with positive refractive power. Their object-side surfaces S55, S65, and S76 are convex, and their image-side surfaces S56, S66, and S77 are convex. Both the object-side surfaces S55, S65, and S76 and the image-side surfaces S56, S66, and S77 are spherical surfaces.

[0110] The fourth lenses L55, L65, and L75 are biconvex lenses with positive refractive power. Their object-side surfaces S510, S610, and S710 are convex, and their image-side surfaces S511, S611, and S711 are convex. The object-side surfaces S510, S610, and S710, as well as the image-side surfaces S511, S611, and S711, are all spherical surfaces.

[0111] The fifth lenses L57, L67, and L77 are biconcave lenses with negative refractive power. Their object-side surfaces S514, S614, and S714 are concave, and their image-side surfaces S515, S615, and S715 are concave. Both the object-side surfaces S514, S614, and S714 and the image-side surfaces S515, S615, and S715 are spherical surfaces.

[0112] The sixth lenses L58, L68, and L78 are biconvex lenses with positive refractive power. Their object-side surfaces S516, S616, and S716 are convex, and their image-side surfaces S517, S617, and S717 are convex. Both the object-side surfaces S516, S616, and S716 and the image-side surfaces S517, S617, and S717 are aspherical surfaces.

[0113] The seventh lenses L56, L66, and L76 are biconvex lenses with positive refractive power. Their object-side surfaces S512, S612, and S712 are convex, and their image-side surfaces S513, S613, and S713 are convex. Both the object-side surfaces S512, S612, and S712 and the image-side surfaces S513, S613, and S713 are spherical surfaces. The seventh lenses L56, L66, and L76 are positioned between the fourth lenses L55, L65, and L75 and the fifth lenses L57, L67, and L77.

[0114] The eighth lenses L54, L64, and L74 have negative refractive power. Their object-side surfaces S58, S67, and S78 are concave, while their image-side surfaces S59, S68, and S79 are spherical surfaces. The eighth lenses L54, L64, and L74 are positioned between the third lenses L53, L63, and L73 and the fourth lenses L55, L65, and L75.

[0115] In addition, wide-angle lenses 5, 6, and 7 must satisfy at least conditions (1)-(16) and one of the following conditions:

[0116] 0.44 ≤ f / f4 ≤ 0.52; (17)

[0117] 0.38 ≤ f34 / f67 ≤ 0.61; (18)

[0118] -4.1 ≤ TTL / R81 ≤ -3.7; (19)

[0119] Wherein, TTL is the distance from the object-side surfaces S51, S61, S71 of the first lenses L51, L61, L71 to the imaging surfaces IMA5, IMA6, IMA7 along the optical axes OA5, OA6, OA7, respectively, in the fifth to seventh embodiments; f is the effective focal length of the wide-angle lenses 5, 6, 7 in the fifth to seventh embodiments; f4 is the effective focal length of the fourth lenses L55, L65, L75 in the fifth to seventh embodiments; f34 is the combined effective focal length of the third lenses L53, L63, L73 and the eighth lenses L54, L64, L74 in the fifth to seventh embodiments; and f67 is the effective focal length of the seventh lens in the fifth to seventh embodiments. The effective focal length of the combination of lenses L56, L66, L76 and the fifth lenses L57, L67, L77; R11 is the radius of curvature of the object-side surfaces S51, S61, S71 of the first lenses L51, L61, L71 in the fifth to seventh embodiments; R22 is the radius of curvature of the image-side surfaces S54, S64, S74 of the second lenses L52, L62, L72 in the fifth to seventh embodiments; R81 is the radius of curvature of the object-side surfaces S58, S67, S78 of the eighth lenses L54, L64, L74 in the fifth to seventh embodiments; and Vd3 is the Abbe coefficient of the third lenses L53, L63, L73 in the fifth to seventh embodiments. This allows wide-angle lenses 5, 6, and 7 to effectively increase the field of view, effectively reduce the overall lens length, effectively increase the aperture, effectively improve resolution, effectively correct aberrations, and effectively correct chromatic aberration.

[0120] When conditions (13): 4.7≤TTL / f≤4.9, (15): -1.03≤TTL / R22≤-0.26, and (19): -4.1≤TTL / R81≤-3.7 are met simultaneously, the total length of the wide-angle lens can be effectively shortened.

[0121] The fifth embodiment of the wide-angle lens of the present invention will now be described in detail. Please refer to [link / reference]. Figure 5The wide-angle lens 5 includes a first lens L51, a second lens L52, a third lens L53, an aperture ST1, an eighth lens L54, a fourth lens L55, a seventh lens L56, a fifth lens L57, a sixth lens L58, an optical filter OF5, and a protective glass CG5. The first lens L51, second lens L52, third lens L53, aperture ST5, eighth lens L54, fourth lens L55, seventh lens L56, fifth lens L57, sixth lens L58, optical filter OF5, and protective glass CG5 are arranged sequentially along the optical axis OA5 from the object side to the image side. During imaging, light rays from the object side are finally imaged onto the imaging plane IMA5. According to paragraphs 1 to 10 of the [Implementation Method], wherein: the eighth lens L54 is a biconcave lens with its image-side surface S59 being concave; the filter OF5 has both its object-side surface S518 and image-side surface S519 being planar; the protective glass CG5 has both its object-side surface S520 and image-side surface S521 being planar; by utilizing the above-mentioned lens, aperture ST5 and the design that satisfies at least one of conditions (1) to (7), the wide-angle lens 5 can effectively increase the field of view, effectively reduce the total length of the lens, effectively increase the aperture, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberration.

[0122] Table 13 is... Figure 5 A table showing the relevant parameters of each lens in the medium wide-angle lens 5.

[0123] Table Thirteen

[0124]

[0125]

[0126] Table 14 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 13.

[0127] Table 14

[0128] Surface serial number k A B C S516 -33.47632 -1.37E-04 -1.10E-05 3.28E-07 S517 -1.653582 2.28E-04 -7.49E-06 3.35E-07

[0129] Table 15 shows the relevant parameter values ​​of the wide-angle lens 5 in the fifth embodiment and the calculated values ​​of the corresponding conditions (1) to (3), (7), (9), (13), (16), (17), (18), and (19). As can be seen from Table 15, the wide-angle lens 5 in the fifth embodiment can meet the requirements of the above conditions.

[0130] Table 15

[0131] f34 38.51mm f67 98.02mm TTL / f 4.89 f / f4 0.51 TTL / R11 0.63 f34 / f67 0.39 Vd3 40.81 TTL / R22 -0.30 TTL / R81 -3.72 f1 / f -1.88 |f2 / f| 2.84 f3 / f 1.63 BFL / TTL 0.27 R11 / R22 -0.48

[0132] Furthermore, the optical performance of the wide-angle lens 5 in the fifth embodiment also meets the requirements. Figure 6AIt can be seen that the longitudinal aberration of the wide-angle lens 5 in the fifth embodiment is between -0.04mm and 0.02mm. Figure 6B It can be seen that the field curvature of the wide-angle lens 5 in the fifth embodiment is between -0.02mm and 0.04mm. Figure 6C It can be seen that the distortion of the wide-angle lens 5 in the fifth embodiment is between -8% and 0%. Figure 6D It can be seen that the lateral chromatic aberration of the wide-angle lens 5 in the fifth embodiment is between -0.5μm and 4.0μm. Figure 6E It can be seen that the modulation conversion function value of the wide-angle lens 5 in the fifth embodiment is between 0.39 and 1.0. Clearly, the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 5 in the fifth embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thus achieving better optical performance.

[0133] The sixth embodiment of the wide-angle lens of the present invention will now be described in detail. Please refer to [link / reference]. Figure 7 The wide-angle lens 2 includes a first lens L61, a second lens L62, a third lens L63, an eighth lens L64, an aperture ST2, a fourth lens L65, a seventh lens L66, a fifth lens L67, a sixth lens L68, a filter OF6, and a protective glass CG6. The first lens L61, second lens L62, third lens L63, eighth lens L64, aperture ST2, fourth lens L65, seventh lens L66, fifth lens L67, sixth lens L68, filter OF6, and protective glass CG6 are arranged sequentially along the optical axis OA6 from the object side to the image side. During imaging, light rays from the object side are finally imaged onto the imaging plane IMA6. According to paragraphs one to ten of the [Implementation Method], wherein:

[0134] The eighth lens L64 is a meniscus lens with a convex image side S68; the filter OF6 has a flat object side S618 and an image side S619; the protective glass CG6 has a flat object side S620 and an image side S621; by using the above lens, aperture ST6 and at least one of the conditions () to (7) in the design, the wide-angle lens 6 can effectively increase the field of view, effectively reduce the total length of the lens, effectively increase the aperture, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberration.

[0135] Table 16 is... Figure 7 A table showing the relevant parameters of each lens in the medium wide-angle lens 6.

[0136] Table 16

[0137]

[0138]

[0139] Table 17 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 16.

[0140] Table 17

[0141]

[0142] Table 18 shows the relevant parameter values ​​of the wide-angle lens 6 in the sixth embodiment and the calculated values ​​of the corresponding conditions (1) to (3), (7), (9), (13), (16), (17), (18), and (19). As can be seen from Table 6, the wide-angle lens 6 in the sixth embodiment can meet the requirements of conditions (1) to (7).

[0143] Table 18

[0144] f34 28.37mm f67 47.86mm TTL / f 4.73 f / f4 0.45 TTL / R11 0.42 f34 / f67 0.59 Vd3 35.25 TTL / R22 -0.66 TTL / R81 -4.07 f1 / f -1.44 |f2 / f| 2.96 f3 / f 1.57 BFL / TTL 0.31 R11 / R22 -1.59

[0145] Furthermore, the optical performance of the wide-angle lens 6 in the sixth embodiment also meets the requirements. Figure 8A It can be seen that the longitudinal aberration of the wide-angle lens 6 in the sixth embodiment is between -0.04mm and 0.02mm. Figure 8B It can be seen that the field curvature of the wide-angle lens 6 in the sixth embodiment is between -0.04mm and 0.04mm. Figure 8C It can be seen that the distortion of the wide-angle lens 6 in the sixth embodiment is between -35% and 0%. Figure 8D It can be seen that the lateral chromatic aberration of the wide-angle lens 6 in the sixth embodiment is between -0.5μm and 4.0μm. Figure 8E It can be seen that the modulation conversion function value of the wide-angle lens 6 in the sixth embodiment is between 0.38 and 1.0. Clearly, the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 6 in the sixth embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thus achieving better optical performance.

[0146] The seventh embodiment of the wide-angle lens of the present invention will now be described in detail. Please refer to [link / reference]. Figure 9 The wide-angle lens 3 includes a first lens L71, a second lens L72, an aperture ST3, a third lens L73, an eighth lens L74, a fourth lens L75, a seventh lens L76, a fifth lens L77, a sixth lens L78, a filter OF3, and a protective glass CG3. The first lens L71, second lens L72, aperture ST3, third lens L73, eighth lens L74, fourth lens L75, seventh lens L76, fifth lens L77, sixth lens L78, filter OF7, and protective glass CG7 are arranged sequentially along the optical axis OA7 from the object side to the image side. During imaging, light rays from the object side are finally imaged onto the imaging plane IMA7. According to paragraphs one to ten of the [Detailed Embodiments], wherein:

[0147] The eighth lens L74 is a biconcave lens with its image-side surface S79 being concave; the filter OF7 has both its object-side surface S718 and image-side surface S719 being flat; the protective glass CG7 has both its object-side surface S720 and image-side surface S721 being flat; by utilizing the above-mentioned lens, aperture ST3 and the design of at least one of the conditions (1) to (7), the wide-angle lens 7 can effectively increase the field of view, effectively reduce the total length of the lens, effectively increase the aperture, effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberration.

[0148] Table 18 is... Figure 9 A table showing the relevant parameters of each lens in the medium wide-angle lens 7.

[0149] Table 18

[0150]

[0151]

[0152] Table 19 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 18.

[0153] Table 19

[0154] Surface serial number k A B C S716 0 -2.51E-04 -2.85E-08 -6.96E-08 S717 0 4.57E-04 -1.57E-06 -7.91E-08

[0155] Table 20 shows the relevant parameter values ​​of the wide-angle lens 7 in the seventh embodiment and the calculated values ​​of the corresponding conditions (1) to (3), (7), (9), (13), (16), (17), (18), and (19). As can be seen from Table 9, the wide-angle lens 7 in the seventh embodiment can meet the requirements of the above conditions.

[0156] Table 20

[0157] f34 19.45mm f67 47.86mm TTL / f 4.02 f / f4 0.51 TTL / R11 0.09 f34 / f67 0.41 Vd3 35.25 TTL / R22 -0.99 TTL / R81 -3.89 f1 / f -1.44 |f2 / f| 2.03 f3 / f 1.08 BFL / TTL 0.26 R11 / R22 -10.93

[0158] Furthermore, the optical performance of the wide-angle lens 7 in the seventh embodiment also meets the requirements. Figure 10A It can be seen that the longitudinal aberration of the wide-angle lens 7 in the seventh embodiment is between -0.01mm and 0.03mm. Figure 10B It can be seen that the field curvature of the wide-angle lens 7 in the seventh embodiment is between -0.04mm and 0.04mm. Figure 10C It can be seen that the distortion of the wide-angle lens 7 in the seventh embodiment is between -35% and 0%. Figure 10D It can be seen that the lateral chromatic aberration of the wide-angle lens 7 in the seventh embodiment is between -0.5μm and 5.0μm. Figure 10EIt can be seen that the modulation conversion function value of the wide-angle lens 7 in the seventh embodiment is between 0.39 and 1.0. It is evident that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 7 in the seventh embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

[0159] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art may make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A wide-angle lens characterized by comprising: Comprising: a first lens having a refractive power, the first lens comprising a concave surface facing an image side; a second lens having a refractive power, the second lens being a meniscus lens comprising a concave surface facing an object side and a convex surface facing the image side; a third lens having a positive refractive power; a fourth lens having a refractive power; a fifth lens having a negative refractive power; a sixth lens having a positive refractive power; a seventh lens having a positive refractive power; an eighth lens having a negative refractive power; wherein the first lens, the second lens, the third lens, the eighth lens, the fourth lens, the seventh lens, the fifth lens and the sixth lens are arranged in order from the object side to the image side along an optical axis of the wide-angle lens, the wide-angle lens at least satisfying one of the following conditions: 0.8≤|f2 / f|≤6.9; 0.2≤f3 / f≤3.4; wherein f is an effective focal length of the wide-angle lens, f2 is an effective focal length of the second lens, and f3 is an effective focal length of the third lens; the wide-angle lens at least satisfying the following condition: 4.7≤TTL / f≤4.9; TTL is a distance along the optical axis from an object side surface of the first lens to an image plane, and f is an effective focal length of the wide-angle lens.

2. The wide-angle lens of claim 1, wherein the seventh lens is a biconvex lens comprising a convex surface facing the object side and another convex surface facing the image side.

3. The wide-angle lens of any one of claims 1-2, wherein the first lens has a negative refractive power and further comprises a convex surface facing the object side, and the second lens has a negative refractive power.

4. The wide-angle lens of any one of claims 1 to 2, wherein the third lens is a biconvex lens comprising a convex surface facing the object side and another convex surface facing the image side, and the fourth lens is a biconvex lens having a positive refractive power and comprising a convex surface facing the object side and another convex surface facing the image side.

5. The wide-angle lens of any one of claims 1 to 2, wherein the fifth lens is a biconcave lens comprising a concave surface facing the object side and another concave surface facing the image side, and the sixth lens is a biconvex lens comprising a convex surface facing the object side and another convex surface facing the image side.

6. The wide-angle lens of any one of claims 1 to 2, wherein, the wide-angle lens at least satisfying one of the following conditions: -7.2≤f1 / f≤-0.4; 0.2≤|f4 / f|≤3.4; 1.7≤f7 / f≤4.5; 0.1≤BFL / TTL≤0.6; 4≤(R61-R62) / (R61+R62)≤10; -11≤R11 / R22≤-0.4; -8≤R41 / R42≤-1; wherein f1 is an effective focal length of the first lens, f is an effective focal length of the wide-angle lens, f4 is an effective focal length of the fourth lens, f7 is an effective focal length of the seventh lens, TTL is a distance along the optical axis from an object side surface of the first lens to an image plane, BFL is a distance along the optical axis from an image side surface of the sixth lens to the image plane, R61 is a radius of curvature of the object side surface of the sixth lens, R62 is a radius of curvature of the image side surface of the sixth lens, R11 is a radius of curvature of the object side surface of the first lens, R22 is a radius of curvature of the image side surface of the second lens, R41 is a radius of curvature of the object side surface of the fourth lens, and R42 is a radius of curvature of the image side surface of the fourth lens.

7. The wide-angle lens of claim 1, wherein the eighth lens comprises a concave surface facing the object side and another concave or convex surface facing the image side.

8. The wide-angle lens of any one of claims 1 to 2, wherein, the wide-angle lens at least satisfying one of the following conditions: 0.06≤TTL / R11≤0.66; -1.03≤TTL / R22≤-0.26; Vd3>35; 0.44≤f / f4≤0.52; 0.38≤f34 / f67≤0.61; -4.1≤TTL / R81≤-3.7; TTL is the distance from the object side surface of the first lens to the imaging surface along the optical axis, f34 is the combined effective focal length of the third lens and the eighth lens, f67 is the combined effective focal length of the seventh lens and the fifth lens, R11 is the curvature radius of the object side surface of the first lens, R22 is the curvature radius of the image side surface of the second lens, Vd3 is the Abbe number of the third lens, f4 is the effective focal length of the fourth lens, and R81 is the curvature radius of the object side surface of the eighth lens.

Images