Wide-angle lens

Abstract

The present invention relates to a wide-angle lens comprising: a first lens having negative refractive power; the second lens has refractive power and comprises a concave surface facing the object side; a third lens having a positive refractive power; a fourth lens having refractive power; a fifth lens having refractive power; and a sixth lens having refractive power.

Description

Technical Field

[0001] The present invention relates to a wide-angle lens. Background Art

[0002] The current development trend of wide-angle lenses, in addition to continuously moving towards a large field of view, also needs to have the characteristics of miniaturization and high resolution according to different application requirements. Conventional wide-angle lenses can no longer meet the current needs, and a new architecture of wide-angle lens is required to simultaneously meet the requirements of a large field of view, miniaturization, and high resolution. Summary of the Invention

[0003] In view of this, the main object of the present invention is to provide a wide-angle lens with a shorter overall length but still having good optical performance.

[0004] The present invention provides a wide-angle lens, including: a first lens having a negative refractive power; a second lens having a refractive power and including a concave surface facing the object side; a third lens having a positive refractive power; a fourth lens having a refractive power; a fifth lens having a refractive power; a sixth lens having a refractive power; the wide-angle lens satisfies at least one of the following conditions: -70 ≤ R21 / d45 ≤ -18; 5mm 2 ≤ (Ra - R21) × d45 ≤ 11mm 2 ; -2.95 ≤ R62 / T6 ≤ -2.01; 0.35 ≤ (R11 - R12) / TTL ≤ 0.61; 1.86 ≤ BFL / f ≤ 1.99; 0.47 ≤ f / AAG ≤ 0.76; 4.5 < L / f < 6.9; 3.4 < R11 / f < 5.5;

[0005] Wherein, f is the effective focal length of the wide-angle lens, R11 is the curvature radius of the object side surface of the first lens, R12 is the curvature radius of the image side surface of the first lens, R21 is the curvature radius of the object side surface of the second lens, R62 is the curvature radius of the image side surface of the sixth lens, d45 is the distance on the optical axis between the image side surface of the second lens closer to the aperture on the object side and the object side surface of the lens closest to the aperture, Ra is the curvature radius of the object side surface of the lens closest to the aperture between the aperture and the imaging surface, T6 is the distance on the optical axis between the object side surface and the image side surface of the sixth lens, TTL is the distance on the optical axis between the object side surface of the first lens and the imaging surface, BFL is the distance on the optical axis between the image side surface of the lens closest to the imaging surface and the imaging surface, AAG is the total air distance on the optical axis between the first lens and the lens closest to the imaging surface; L is the distance on the optical axis between the object side surface of the first lens and the image side surface of the lens closest to the imaging surface.

[0006] For the wide-angle lens of the present invention, the fourth lens has a positive refractive power; the fifth lens has a negative refractive power; the sixth lens has a positive refractive power.

[0007] For the wide-angle lens of the present invention, the first lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side; the third lens includes a convex surface facing the object side; the fourth lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the image side; the fifth lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side; the sixth lens is a meniscus lens and further includes a convex surface facing the object side.

[0008] For the wide-angle lens of the present invention, the third lens is a biconvex lens and further includes a convex surface facing the image side.

[0009] For the wide-angle lens of the present invention, the third lens is a meniscus lens and further includes a concave surface facing the image side.

[0010] For the wide-angle lens of the present invention, the second lens has a positive refractive power and includes a convex surface facing the image side; the sixth lens includes a concave surface facing the image side.

[0011] For the wide-angle lens of the present invention, the second lens has a negative refractive power and includes a concave surface facing the image side; the sixth lens includes a convex surface facing the image side.

[0012] For the wide-angle lens of the present invention, it further includes a seventh lens. The seventh lens is a plano-convex lens and includes a convex surface facing the object side and a flat surface facing the image side.

[0013] For the wide-angle lens of the present invention, the wide-angle lens satisfies at least one of the following conditions: 2.5mm ≤ Ra / Nd4 ≤ 15mm; 5 ≤ Ra / d67 ≤ 62; 2mm ≤ Ra + Rd ≤ 19mm; -1mm < fb + Rc < 2mm; 0.14 < Ra / fc < 6.62; 3mm -1< Vdb / Rc < 7mm -1; 0.14 mm < Ra / Vdb < 1.34 mm; -2.3 < f1 / f < -1.5; -38.3 < Vdd / (fc / fb) < -15.2; 0.14 < f / TTL < 0.18; 3.1 < TTL / BFL < 8.1; where Ra is the curvature radius of the object side of the lens closest to the aperture between the aperture and the imaging surface, Rd is the curvature radius of the object side of the second lens closest to the imaging surface, Nd4 is the refractive index of the lens closest to the aperture between the aperture and the imaging surface, d67 is the distance from the image side of the lens closest to the aperture between the object side and the aperture to the aperture on the optical axis, f is the effective focal length of the wide-angle lens, f1 is the effective focal length of the first lens, fb is the effective focal length of the second lens closest to the aperture between the aperture and the imaging surface, fc is the effective focal length of the lens closest to the imaging surface, TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, BFL is the distance from the image side of the seventh lens to the imaging surface on the optical axis, L is the distance from the object side of the first lens to the image side of the lens closest to the imaging surface on the optical axis, Ra is the curvature radius of the object side of the lens closest to the aperture between the aperture and the imaging surface, Rc is the curvature radius of the object side of the lens closest to the imaging surface, Vdb is the Abbe number of the second lens closest to the aperture between the aperture and the imaging surface, Vdd is the Abbe number of the second lens closest to the imaging surface, and R11 is the curvature radius of the object side of the first lens.

[0014] The wide-angle lens of the present invention has a large field of view, a short total lens length, and high resolution, but still has good optical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a lens configuration and optical path schematic diagram of the fourth embodiment of the wide-angle lens according to the present invention.

[0016] Figure 2 、 3 、4 are the longitudinal aberration diagram, field curvature diagram, and distortion diagram of the fourth embodiment of the wide-angle lens according to the present invention.

[0017] Figure 5 is a lens configuration and optical path schematic diagram of the fifth embodiment of the wide-angle lens according to the present invention.

[0018] Figure 6 、 7 、8 are the longitudinal aberration diagram, field curvature diagram, and distortion diagram of the fifth embodiment of the wide-angle lens according to the present invention.

[0019] Figure 9It is a lens configuration and optical path schematic diagram of the sixth embodiment of the wide-angle lens according to the present invention.

[0020] Figure 10 、 11 、12 are the longitudinal aberration diagram, field curvature diagram, and distortion diagram of the sixth embodiment of the wide-angle lens according to the present invention.

[0021] Figure 13 It is a lens configuration and optical path schematic diagram of the seventh embodiment of the wide-angle lens according to the present invention.

[0022] Figure 14 、 15 、16 are the Longitudinal Aberration diagram, Field Curvature diagram, and Distortion diagram of the seventh embodiment of the wide-angle lens according to the present invention, respectively.

[0023] Figure 17 It is a lens configuration and optical path schematic diagram of the eighth embodiment of the wide-angle lens according to the present invention.

[0024] Figure 18 、 19 、20 are the longitudinal aberration diagram, field curvature diagram, and distortion diagram of the eighth embodiment of the wide-angle lens according to the present invention, respectively.

[0025] Figure 21 It is a lens configuration and optical path schematic diagram of the ninth embodiment of the wide-angle lens according to the present invention.

[0026] Figure 22 、 23 、24 are the longitudinal aberration diagram, field curvature diagram, and distortion diagram of the ninth embodiment of the wide-angle lens according to the present invention, respectively.

[0027] Figure 25 It is a lens configuration and optical path schematic diagram of the tenth embodiment of the wide-angle lens according to the present invention. Detailed implementation mode

[0028] The wide-angle lens according to the first embodiment of the present invention includes: a first lens having a negative refractive power and including a convex surface facing the object side; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a positive refractive power; a fifth lens having a negative refractive power; a sixth lens having a refractive power and including a concave surface facing the image side; and a seventh lens having a positive refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are sequentially arranged along the optical axis from the object side to the image side. When imaging, the light rays from the object side are finally imaged on the imaging surface. Through the above design, the first embodiment of the present invention can achieve basic operation.

[0029] The wide-angle lens according to the second embodiment of the present invention includes: a first lens which is a meniscus lens having a refractive power; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a refractive power; a sixth lens having a refractive power; and a seventh lens having a refractive power. Only one of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is a biconcave lens. Two lenses with positive refractive powers are included between two lenses with negative refractive powers. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are sequentially arranged along the optical axis from the object side to the image side. When imaging, the light rays from the object side are finally imaged on the imaging surface. Through the above design, the second embodiment of the present invention can achieve basic operation.

[0030] The wide-angle lens of the third embodiment of the present invention includes: a first lens having a negative refractive power and including a convex surface facing the object side; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a positive refractive power; a fifth lens having a negative refractive power; a sixth lens having a refractive power and including a concave surface facing the image side; and a seventh lens having a positive refractive power. The second lens is a meniscus lens. The sixth lens is a meniscus lens. The refractive powers of the first lens and the second lens are opposite. The object-side surface shape of the first lens is similar to the image-side surface shape of the second lens. The refractive powers of the first lens and the sixth lens are opposite. The image-side surface shape of the first lens is similar to the image-side surface shape of the sixth lens. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are arranged in sequence along the optical axis from the object side to the image side. During imaging, the light from the object side is finally imaged on the imaging surface. Through the above design, the third embodiment of the present invention can achieve basic operation.

[0031] In addition, in another embodiment of the wide-angle lens of the above embodiments, the condition -1mm < fb + Rc < 2mm can be further satisfied, where fb is the effective focal length of the lens second closest to the aperture between the aperture and the imaging surface, and Rc is the curvature radius of the object-side surface of the lens closest to the imaging surface, to effectively correct the angle of light incident on the photosensitive component, and the basic operation can be achieved by satisfying this condition. In still another embodiment, the condition 0.14 < Ra / fc < 6.62 can be further satisfied, where Ra is the curvature radius of the object-side surface of the lens closest to the aperture between the aperture and the imaging surface, and fc is the effective focal length of the lens closest to the imaging surface, to effectively compensate for the performance degradation caused by the high-temperature environment and improve the Monte Carlo yield, and the basic operation can be achieved by satisfying this condition. In still another embodiment, the condition 3mm -1< Vdb / Rc < 7mm -1; where Vdb is the Abbe number of the lens second closest to the aperture between the aperture and the imaging plane, and Rc is the curvature radius of the object side of the lens closest to the imaging plane, to effectively correct the lens sensitivity and improve the Monte Carlo yield. Meeting this condition can achieve basic operation. In yet another other embodiment, the condition: 0.14mm < Ra / Vdb < 1.34mm can be further satisfied; where Ra is the curvature radius of the object side of the lens closest to the aperture between the aperture and the imaging plane, and Vdb is the Abbe number of the lens second closest to the aperture between the aperture and the imaging plane, to effectively reduce the influence of stray light on the photosensitive component. Meeting this condition can achieve basic operation. In yet another other embodiment, the condition: -2.3 < f1 / f < -1.5 can be further satisfied; where f1 is the effective focal length of the first lens, and f is the effective focal length of the wide-angle lens, to effectively increase the field of view. Meeting this condition can achieve basic operation. In yet another other embodiment, the condition: -38.3 < Vdd / (fc / fb) < -15.2 can be further satisfied; where Vdd is the Abbe number of the lens second closest to the imaging plane, fc is the effective focal length of the lens closest to the imaging plane, and fb is the effective focal length of the lens second closest to the aperture between the aperture and the imaging plane, to effectively improve the imaging quality. Meeting this condition can achieve basic operation. In yet another other embodiment, the condition: 0.14 < f / TTL < 0.18 can be further satisfied; where f is the effective focal length of the wide-angle lens, and TTL is the distance on the optical axis from the object side of the first lens to the imaging plane, to effectively reduce the volume of the wide-angle lens. Meeting this condition can achieve basic operation. In yet another other embodiment, the condition: 3.1 < TTL / BFL < 8.1 can be further satisfied; where TTL is the distance on the optical axis from the object side of the first lens to the imaging plane, and BFL is the distance on the optical axis from the image side of the seventh lens to the imaging plane, to effectively reduce the volume of the wide-angle lens. Meeting this condition can achieve basic operation. In yet another other embodiment, the condition: 4.5 < L / f < 6.9 can be further satisfied; where L is the distance on the optical axis from the object side of the first lens to the image side of the lens closest to the imaging plane, and f is the effective focal length of the wide-angle lens, to effectively reduce the volume of the wide-angle lens. Meeting this condition can achieve basic operation. In yet another other embodiment, the condition: 3.4 < R11 / f < 5.5 can be further satisfied; where R11 is the curvature radius of the object side of the first lens, and f is the effective focal length of the wide-angle lens, to effectively improve the imaging quality. Meeting this condition can achieve basic operation.

[0032] Please refer to Table 1, Table 2, Table 4, Table 5, Table 7 and Table 8 below. Among them, Table 1, Table 4 and Table 7 are the relevant parameter tables of each lens of the fourth to sixth embodiments of the wide-angle lens according to the present invention, and Table 2, Table 5 and Table 8 are the relevant parameter tables of the aspherical surfaces of the aspherical lenses in Table 1, Table 4 and Table 7 respectively.

[0033] Figure 1 , 5 , 9 are the lens configurations and optical path schematic diagrams of the fourth, fifth and sixth embodiments of the wide-angle lens according to the present invention. Among them, the first lenses L41, L51, L61 are meniscus lenses with negative refractive power, the object sides S41, S51, S61 are convex surfaces, the image sides S42, S52, S62 are concave surfaces, and both the object sides S41, S51, S61 and the image sides S42, S52, S62 are spherical surfaces.

[0034] The second lenses L42, L52, L62 are meniscus lenses with positive refractive power, the object sides S43, S53, S63 are concave surfaces, the image sides S44, S54, S64 are convex surfaces, and both the object sides S43, S53, S63 and the image sides S44, S54, S64 are aspherical surfaces.

[0035] The third lenses L43, L53, L63 have positive refractive power, and the object sides S45, S55, S65 are convex surfaces.

[0036] The fourth lenses L44, L54, L64 are biconvex lenses with positive refractive power, the object sides S48, S58, S68 are convex surfaces, the image sides S49, S59, S69 are convex surfaces, and both the object sides S48, S58, S68 and the image sides S49, S59, S69 are spherical surfaces.

[0037] The fifth lenses L45, L55, L65 are biconcave lenses with negative refractive power, the object sides S410, S510, S610 are concave surfaces, the image sides S411, S511, S611 are concave surfaces, and both the object sides S410, S510, S610 and the image sides S411, S511, S611 are aspherical surfaces.

[0038] The sixth lenses L46, L56, L66 are meniscus lenses with positive refractive power, the object sides S412, S512, S612 are convex surfaces, the image sides S413, S513, S613 are concave surfaces, and both the object sides S412, S512, S612 and the image sides S413, S513, S613 are aspherical surfaces.

[0039] The seventh lenses L47, L57, and L67 are plano-convex lenses with positive refractive power. Their object sides S414, S514, and S614 are convex surfaces, and their image sides S415, S515, and S615 are flat surfaces. The object sides S414, S514, and S614 are aspherical surfaces.

[0040] In addition, the wide-angle lenses 4, 5, and 6 can optimize the performance of the wide-angle lenses by satisfying at least one or all of the following conditions (1) to (10). The optimized performance is as described above, so it will not be elaborated here:

[0041] -1mm < fb + Rc < 2mm; (1)

[0042] 0.14 < Ra / fc < 6.62; (2)

[0043] 3mm -1 <Vdb / Rc < 7mm -1 ; (3)

[0044] 0.14mm < Ra / Vdb < 1.34mm; (4)

[0045] -2.3 < f1 / f < -1.5; (5)

[0046] -38.3 < Vdd / (fc / fb) < -15.2; (6)

[0047] 0.14 < f / TTL < 0.18; (7)

[0048] 3.1 < TTL / BFL < 8.1; (8)

[0049] 4.5 < L / f < 6.9; (9)

[0050] 3.4 < R11 / f < 5.5; (10)

[0051] Wherein, f is the effective focal length of the wide-angle lenses 4, 5, and 6 in the fourth to sixth embodiments; f1 is the effective focal length of the first lenses L41, L51, and L61 in the fourth to sixth embodiments; fb is the effective focal length of the lens second closest to the apertures ST4, ST5, and ST6 between the apertures ST4, ST5, and ST6 and the imaging surfaces IMA4, IMA5, and IMA6 in the fourth to sixth embodiments; fc is the effective focal length of the lens closest to the imaging surfaces IMA4, IMA5, and IMA6 in the fourth to sixth embodiments; TTL is the distance on the optical axes OA4, OA5, and OA6 from the object sides S41, S51, and S61 of the first lenses L41, L51, and L61 to the imaging surfaces IMA4, IMA5, and IMA6 in the fourth to sixth embodiments; BFL is the distance on the optical axes OA4, OA5, and OA6 from the image sides S415, S515, and S615 of the seventh lenses L47, L57, and L67 to the imaging surfaces IMA4, IMA5, and IMA6 in the fourth to sixth embodiments; L is the distance on the optical axes OA4, OA5, and OA6 from the object sides S41, S51, and S61 of the first lenses L41, L51, and L61 to the image sides S415, S515, and S615 of the lens closest to the imaging surface in the fourth to sixth embodiments; Ra is the radius of curvature of the object sides S48, S58, and S68 of the lens second closest to the apertures ST4, ST5, and ST6 between the apertures ST4, ST5, and ST6 and the imaging surfaces IMA4, IMA5, and IMA6 in the fourth to sixth embodiments; Rc is the radius of curvature of the object sides S414, S514, and S614 of the lens closest to the imaging surfaces IMA4, IMA5, and IMA6 in the fourth to sixth embodiments; Vdb is the Abbe number of the lens second closest to the apertures ST4, ST5, and ST6 between the apertures ST4, ST5, and ST6 and the imaging surfaces IMA4, IMA5, and IMA6 in the fourth to sixth embodiments; Vdd is the Abbe number of the lens second closest to the imaging surfaces IMA4, IMA5, and IMA6 in the fourth to sixth embodiments; R11 is the radius of curvature of the object sides S41, S51, and S61 of the first lenses L41, L51, and L61 in the fourth to sixth embodiments. This enables the wide-angle lenses 4, 5, and 6 to effectively shorten the total lens length, effectively increase the field of view, effectively improve the resolution, and effectively correct the aberration.

[0052] A detailed description of the fourth embodiment of the wide-angle lens of the present invention will now be given. Please refer to Figure 1, the wide-angle lens 4 sequentially includes a first lens L41, a second lens L42, a third lens L43, an aperture ST4, a fourth lens L44, a fifth lens L45, a sixth lens L46, a seventh lens L47, and a filter OF4 along the optical axis OA4 from the object side to the image side. During imaging, the light rays from the object side are finally imaged on the imaging surface IMA4. According to the fifth to twelfth paragraphs of the

Embodiment

[0053] Table 1 is Figure 1 a table of the relevant parameters of each lens of the medium wide-angle lens 4.

[0054] Table 1

[0055]

[0056] The aspherical surface depression degree z of the aspherical lens in Table 1 is obtained by the following formula:

[0057] z = ch 2 / {1 + [1 - (k + 1)c 2 h 2 1 / 2}+Ah 4 +Bh 6 +Ch 8 +Dh 10

[0058] ​Where: c: curvature; h: the perpendicular distance from any point on the lens surface to the optical axis; k: conic coefficient; A - D: aspheric coefficients.

[0059] Table 2 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 1.

[0060] Table 2

[0061]

[0062] Table 3 shows the relevant parameter values of the wide - angle lens 4 of the fourth embodiment and the calculated values corresponding to conditions (1) to (10). It can be seen from Table 3 that the wide - angle lens 4 of the fourth embodiment can meet the requirements of conditions (1) to (10).

[0063] Table 3

[0064]

[0065] In addition, the optical performance of the wide - angle lens 4 of the fourth embodiment can also meet the requirements. From Figure 2 it can be seen that the longitudinal aberration of the wide - angle lens 4 of the fourth embodiment is between - 0.015 mm and 0.05 mm. From Figure 3 it can be seen that the field curvature of the wide - angle lens 4 of the fourth embodiment is between - 0.06 mm and 0 mm. From Figure 4 it can be seen that the distortion of the wide - angle lens 4 of the fourth embodiment is between - 100% and 0%. Obviously, the longitudinal aberration, field curvature, and distortion of the wide - angle lens 4 of the fourth embodiment can all be effectively corrected, thereby obtaining better optical performance.

[0066] Now, the fifth embodiment of the wide - angle lens of the present invention will be described in detail. Please refer to Figure 5, the wide-angle lens 5 sequentially includes a first lens L51, a second lens L52, a third lens L53, an aperture ST5, a fourth lens L54, a fifth lens L55, a sixth lens L56, a seventh lens L57, a filter OF5, and a protective glass CG5 along the optical axis OA5 from the object side to the image side. During imaging, the light rays from the object side are finally imaged on the imaging surface IMA5. According to paragraphs 5 to 12 of the [Embodiment], where: the third lens L53 is a meniscus lens, its image side surface S56 is concave, and both the object side surface S55 and the image side surface S56 are aspherical surfaces; both the object side surface S516 and the image side surface S517 of the filter OF5 are flat; both the object side surface S518 and the image side surface S519 of the protective glass CG5 are flat; by using the above lenses, aperture ST5 and a design that satisfies at least one of the conditions (1) to (10), the wide-angle lens 5 can effectively reduce the total lens length, effectively improve the field of view, effectively improve the resolution, and effectively correct the aberration. When the wide-angle lens of the present invention only satisfies condition (5), conditional formula (9) or conditional formula (10), and the first, fourth, fifth, and seventh lenses have negative, positive, negative, and positive refractive powers respectively, the object side surface of the first lens is convex and the image side surface is concave, and the image side surface of the sixth lens is concave, the basic operation requirements can be achieved; or only satisfy condition (5), conditional formula (9) or conditional formula (10), and the first, fourth, fifth, and seventh lenses have negative, positive, negative, and positive refractive powers respectively, the image side surface of the sixth lens is concave, the object side surface of the seventh lens is convex and the image side surface is flat, the basic operation requirements can be achieved; or only satisfy condition (5), conditional formula (9) or conditional formula (10), and there are at least two lenses with positive refractive powers between two lenses with negative refractive powers, and at least one of the second to seventh lenses is a biconcave lens, the basic operation requirements can be achieved.

[0067] Table IV is Figure 5 the relevant parameter table of each lens of the medium wide-angle lens 5.

[0068] Table IV

[0069]

[0070]

[0071] The definition of the asperity degree z of the aspherical surface of each lens in Table IV is the same as the definition of the asperity degree z of the aspherical surface of each lens in Table I of the fourth embodiment, and will not be elaborated here.

[0072] Table V is the relevant parameter table of the aspherical surfaces of the aspherical lenses in Table IV.

[0073] Table V

[0074]

[0075] Table VI shows the relevant parameter values of the wide-angle lens 5 of the fifth embodiment and the calculated values for the corresponding conditions (1) to (10). From Table VI, it can be seen that the wide-angle lens 5 of the fifth embodiment can meet the requirements of conditions (1) to (10).

[0076] Table VI

[0077]

[0078] In addition, the optical performance of the wide-angle lens 5 of the fifth embodiment can also meet the requirements. It can be seen that the longitudinal aberration of the wide-angle lens 5 of the fifth embodiment is between -0.02 mm and -0.005 mm. It can be seen that the field curvature of the wide-angle lens 5 of the fifth embodiment is between -0.04 mm and 0 mm. It can be seen that the distortion of the wide-angle lens 5 of the fifth embodiment is between -100% and 0%. Obviously, the longitudinal aberration, field curvature, and distortion of the wide-angle lens 5 of the fifth embodiment can all be effectively corrected, thereby obtaining better optical performance. Figure 6 It can be seen that the longitudinal aberration of the wide-angle lens 5 of the fifth embodiment is between -0.02 mm and -0.005 mm. It can be seen that the field curvature of the wide-angle lens 5 of the fifth embodiment is between -0.04 mm and 0 mm. It can be seen that the distortion of the wide-angle lens 5 of the fifth embodiment is between -100% and 0%. Obviously, the longitudinal aberration, field curvature, and distortion of the wide-angle lens 5 of the fifth embodiment can all be effectively corrected, thereby obtaining better optical performance. Figure 7 It can be seen that the field curvature of the wide-angle lens 5 of the fifth embodiment is between -0.04 mm and 0 mm. It can be seen that the distortion of the wide-angle lens 5 of the fifth embodiment is between -100% and 0%. Obviously, the longitudinal aberration, field curvature, and distortion of the wide-angle lens 5 of the fifth embodiment can all be effectively corrected, thereby obtaining better optical performance. Figure 8 It can be seen that the distortion of the wide-angle lens 5 of the fifth embodiment is between -100% and 0%. Obviously, the longitudinal aberration, field curvature, and distortion of the wide-angle lens 5 of the fifth embodiment can all be effectively corrected, thereby obtaining better optical performance.

[0079] Now, a sixth embodiment of the wide-angle lens of the present invention will be described in detail. Please refer to Figure 9, the wide-angle lens 6 sequentially includes a first lens L61, a second lens L62, a third lens L63, an aperture ST6, a fourth lens L64, a fifth lens L65, a sixth lens L66, a seventh lens L67, a filter OF6, and a protective glass CG6 along the optical axis OA6 from the object side to the image side. During imaging, the light from the object side is finally imaged on the imaging surface IMA6. According to paragraphs 5 to 12 of the

Embodiment

[0080] Table VII is Figure 9 the table of relevant parameters of each lens of the medium wide-angle lens 6.

[0081] Table VII

[0082]

[0083]

[0084] The definition of the aspherical surface depression z of each lens in Table VII is the same as the definition of the aspherical surface depression z of each lens in Table I of the fourth embodiment, and will not be elaborated here.

[0085] Table VIII is the table of relevant parameters of the aspherical surfaces of the aspherical lenses in Table VII.

[0086] Table VIII

[0087]

[0088] Table IX shows the relevant parameter values of the wide-angle lens 6 of the sixth embodiment and the calculated values for the corresponding conditions (1) to (10). From Table IX, it can be seen that the wide-angle lens 6 of the sixth embodiment can meet the requirements of conditions (1) to (10).

[0089] Table IX

[0090]

[0091] In addition, the optical performance of the wide-angle lens 6 of the sixth embodiment can also meet the requirements. As Figure 10 can be seen, the longitudinal aberration of the wide-angle lens 6 of the sixth embodiment is between -0.015 mm and -0.005 mm. As Figure 11 can be seen, the field curvature of the wide-angle lens 6 of the sixth embodiment is between -0.04 mm and 0.01 mm. As Figure 12 can be seen, the distortion of the wide-angle lens 6 of the sixth embodiment is between -100% and 0%. Obviously, the longitudinal aberration, field curvature, and distortion of the wide-angle lens 6 of the sixth embodiment can all be effectively corrected, thereby obtaining better optical performance.

[0092] The present invention also provides a wide-angle lens, including: a first lens having a negative refractive power; a second lens having a refractive power, the second lens including a concave surface facing the object side; a third lens having a positive refractive power, the third lens including a convex surface facing the object side; an aperture; a fourth lens having a refractive power; a fifth lens having a refractive power; and a sixth lens having a refractive power; wherein the first lens, the second lens, the third lens, the aperture, the fourth lens, the fifth lens, and the sixth lens are arranged in sequence along the optical axis from the object side to the image side; wherein the wide-angle lens satisfies at least one of the following conditions: -70 ≤ R21 / d45 ≤ -18; 5 mm 2 ≤ (Ra - R21) × d45 ≤ 11 mm 2; -2.95 ≤ R62 / T6 ≤ -2.01; 0.35 ≤ (R11 - R12) / TTL ≤ 0.61; 1.86 ≤ BFL / f ≤ 1.99; 0.47 ≤ f / AAG ≤ 0.76; where f is the effective focal length of the wide-angle lens, R11 is the radius of curvature of the object side surface of the first lens, R12 is the radius of curvature of the image side surface of the first lens, R21 is the radius of curvature of the object side surface of the second lens, R62 is the radius of curvature of the image side surface of the sixth lens, d45 is the distance on the optical axis from the image side surface of the second lens closest to the aperture on the object side to the object side surface of the lens closest to the aperture, Ra is the radius of curvature of the object side surface of the lens closest to the aperture between the aperture and the imaging surface, T6 is the distance on the optical axis from the object side surface of the sixth lens to the image side surface of the sixth lens, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, BFL is the distance on the optical axis from the image side surface of the lens closest to the imaging surface to the imaging surface, and AAG is the total air distance on the optical axis between the first lens and the lens closest to the imaging surface. When the wide-angle lens of the present invention satisfies the above characteristics and at least one of the conditions, it is a preferred embodiment of the present invention.

[0093] Please refer to Tables X, XI, XIII, XIV, XVI, XVII, XIX, and XX below. Among them, Tables X, XIII, XVI, and XIX are the relevant parameter tables of each lens of the seventh to tenth embodiments of the wide-angle lens according to the present invention, and Tables XI, XIV, XVII, and XX are the relevant parameter tables of the aspherical surfaces of the aspherical lenses in Tables X, XIII, XVI, and XIX respectively. In the following embodiments, the aspherical surface depression 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, and A to C are the aspherical coefficients, and the aspherical coefficients can be expressed in scientific notation. For example, 2.00E-03 represents 2.00×10 -3 .

[0094] Figure 13 、 17 ​, 21 are respectively the lens configurations and optical path schematic diagrams of the seventh, eighth, ninth, and tenth embodiments of the wide-angle lens of the present invention. Among them, the first lenses L71, L81, L91, and L101 are meniscus lenses with negative refractive power, their object sides S71, S81, S91, and S101 are convex surfaces, their image sides S72, S82, S92, and S102 are concave surfaces, and both the object sides S71, S81, S91, and S101 and the image sides S72, S82, S92, and S102 are spherical surfaces.

[0095] The second lenses L72, L82, L92, and L102 are biconcave lenses with negative refractive power, their object sides S73, S83, S93, and S103 are concave surfaces, their image sides S74, S84, S94, and S104 are concave surfaces, and both the object sides S73, S83, S93, and S103 and the image sides S74, S84, S94, and S104 are aspherical surfaces.

[0096] The third lenses L73, L83, L93, and L103 are biconvex lenses with positive refractive power, their object sides S75, S85, S95, and S105 are convex surfaces, their image sides S76, S86, S96, and S106 are convex surfaces, and both the object sides S75, S85, S95, and S105 and the image sides S76, S86, S96, and S106 are aspherical surfaces.

[0097] The fourth lenses L74, L84, L94, and L104 are biconvex lenses with positive refractive power, their object sides S78, S88, S98, and S108 are convex surfaces, their image sides S79, S89, S99, and S109 are convex surfaces, and both the object sides S78, S88, S98, and S108 and the image sides S79, S89, S99, and S109 are spherical surfaces.

[0098] The fifth lenses L75, L85, L95, and L105 are biconcave lenses with negative refractive power, their object sides S710, S810, S910, and S1010 are concave surfaces, their image sides S711, S811, S911, and S1011 are concave surfaces, and both the object sides S710, S810, S910, and S1010 and the image sides S711, S811, S911, and S1011 are aspherical surfaces.

[0099] The sixth lenses L76, L86, L96, and L106 are biconvex lenses with positive refractive power, their object sides S712, S812, S912, and S1012 are convex surfaces, their image sides S713, S813, S913, and S1013 are convex surfaces, and both the object sides S712, S812, S912, and S1012 and the image sides S713, S813, S913, and S1013 are aspherical surfaces.

[0100] In addition, the wide-angle lenses 7, 8, 9, and 10 satisfy at least one of the following conditions (11) to (19):

[0101] -70 ≤ R21 / d45 ≤ -18; (11)

[0102] 5mm 2 ≤ (Ra-R21)×d45 ≤ 11mm 2 ; (12)

[0103] 2.5mm ≤ Ra / Nd4 ≤ 15mm; (13)

[0104] 5 ≤ Ra / d67 ≤ 62; (14)

[0105] 2mm ≤ Ra+Rd ≤ 19mm; (15)

[0106] -2.95 ≤ R62 / T6 ≤ -2.01; (16)

[0107] 0.35 ≤ (R11-R12) / TTL ≤ 0.61; (17)

[0108] 1.86 ≤ BFL / f ≤ 1.99; (18)

[0109] 0.47 ≤ f / AAG ≤ 0.76; (19)

[0110] Among them, f is the effective focal length of the wide-angle lenses 7, 8, 9, and 10 in the seventh to tenth embodiments; R11 is the radius of curvature of the object-side surfaces S71, S81, S91, and S101 of the first lenses L71, L81, L91, and L101 in the seventh to tenth embodiments; R12 is the radius of curvature of the image-side surfaces S72, S82, S92, and S102 of the first lenses L71, L81, L91, and L101 in the seventh to tenth embodiments; R21 is the radius of curvature of the object-side surfaces S73, S83, S93, and S103 of the second lenses L72, L82, L92, and L102 in the seventh to tenth embodiments; R62 is the radius of curvature of the image-side surfaces S713, S813, S913, and S1013 of the sixth lenses L76, L86, L96, and L106 in the seventh to tenth embodiments; d45 is the distance on the optical axes OA7, OA8, OA9, and OA10 between the image-side surfaces S74, S84, S94, and S104 of the lenses L72, L82, L92, and L102, which are the second closest to the apertures ST7, ST8, ST9, and ST10 on the object side, and the object-side surfaces S75, S85, S95, and S105 of the lenses L73, L83, L93, and L103, which are the closest to the apertures ST7, ST8, ST9, and ST10, in the seventh to tenth embodiments; Ra is the radius of curvature of the object-side surfaces S78, S88, S98, and S108 of the lenses L74, L84, L94, and L104, which are the closest to the apertures ST7, ST8, ST9, and ST10, between the apertures ST7, ST8, ST9, and ST10 and the imaging surfaces IMA7, IMA8, IMA9, and IMA10 in the seventh to tenth embodiments; T6 is the distance on the optical axes OA7, OA8, OA9, and OA10 between the object-side surfaces S712, S812, S912, and S1012 and the image-side surfaces S713, S813, S913, and S1013 of the sixth lenses L76, L86, L96, and L106 in the seventh to tenth embodiments; TTL is the distance on the optical axes OA7, OA8, OA9, and OA10 between the object-side surfaces S71, S81, S91, and S101 of the first lenses L71, L81, L91, and L101 and the imaging surfaces IMA7, IMA8, IMA9, and IMA10 in the seventh to tenth embodiments; BFL is the distance on the optical axes OA7, OA8, OA9, and OA10 between the image-side surfaces S713, S813, S913, and S1013 of the lenses L76, L86, L96, and L106, which are the closest to the imaging surfaces IMA7, IMA8, IMA9, and IMA10, and the imaging surfaces IMA7, IMA8, IMA9, and IMA10 in the seventh to tenth embodiments; AAG is in the seventh to tenth embodiments,The sum of the air spacings on the optical axes OA7, OA8, OA9, OA10 between the first lenses L71, L81, L91, L101 and the lenses L76, L86, L96, L106 closest to the imaging surfaces IMA7, IMA8, IMA9, IMA10. Nd4 is the refractive index of the lenses L74, L84, L94, L104 closest to the apertures ST7, ST8, ST9, ST10 between the apertures ST7, ST8, ST9, ST10 and the imaging surfaces IMA7, IMA8, IMA9, IMA10 in the seventh to tenth embodiments. d67 is the distance on the optical axes OA7, OA8, OA9, OA10 from the image sides S76, S86, S96, S106 of the lenses L73, L83, L93, L103 closest to the apertures ST7, ST8, ST9, ST10 on the object side to the apertures ST7, ST8, ST9, ST10 in the seventh to tenth embodiments. Rd is the radius of curvature of the object sides S710, S810, S910, S1010 of the lenses L75, L85, L95, L105 second closest to the imaging surfaces IMA7, IMA8, IMA9, IMA10 in the seventh to tenth embodiments. This enables the wide-angle lenses 7, 8, 9, 10 to effectively increase the field of view, effectively reduce the total lens length, effectively improve the resolution, effectively resist the ambient temperature, and effectively correct the aberration.,

[0111] When the condition (11) is satisfied: -70 ≤ R21 / d45 ≤ -18, the total lens length can be effectively shortened, the peripheral image light quantity can be increased, and the lens manufacturing yield can be improved. When the condition (12) is satisfied: 5mm 2 ≤ (Ra - R21) × d45 ≤ 11mm 2 the field curvature can be effectively corrected, the imaging quality degradation caused by the high-temperature environment can be compensated, and the lens manufacturing yield can be improved. When the condition (13) is satisfied: 2.5mm ≤ Ra / Nd4 ≤ 15mm, the longitudinal chromatic aberration can be effectively corrected and the wide-angle lens manufacturing yield can be improved. When the condition (14) is satisfied: 5 ≤ Ra / d67 ≤ 62, the off-axis aberration and astigmatism can be effectively corrected. When the condition (15) is satisfied: 2mm ≤ Ra + Rd ≤ 19mm, the off-axis aberration and astigmatism can be effectively corrected. When the condition (16) is satisfied: -2.95 ≤ R62 / T6 ≤ -2.01, the total lens length can be effectively shortened. When the condition (17) is satisfied: 0.35 ≤ (R11 - R12) / TTL ≤ 0.61, the lens manufacturing yield can be effectively improved. When the condition (18) is satisfied: 1.86 ≤ BFL / f ≤ 1.99, the total lens length can be effectively shortened. When the condition (19) is satisfied: 0.47 ≤ f / AAG ≤ 0.76, the total lens length can be effectively shortened.

[0112] A seventh embodiment of the wide-angle lens of the present invention will now be described in detail. Refer to Figure 13 , the wide-angle lens 7 sequentially includes a first lens L71, a second lens L72, a third lens L73, an aperture ST7, a fourth lens L74, a fifth lens L75, and a sixth lens L76 along the optical axis OA7 from the object side to the image side. When imaging, the light rays from the object side are finally imaged on the imaging surface IMA7. By using the above lenses, aperture ST7 and a design that satisfies at least one of the conditions (11) to (19), the wide-angle lens 7 can effectively improve the field of view, effectively reduce the total lens length, effectively improve the resolution, effectively resist the ambient temperature, and effectively correct the aberration. When the wide-angle lens of the present invention only satisfies the refractive surface shape characteristics in the conditions (11), (12), (13), (14), (15), (16), (17), (18), or (19) and the independent terms, the basic operation requirements can be achieved.

[0113] Table X is Figure 13 a table of relevant parameters of each lens of the wide-angle lens 7 in

[0114] Table X

[0115]

[0116] Table XI is a table of relevant parameters of the aspherical surfaces of the aspherical lenses in Table X.

[0117] Table XI

[0118]

[0119] Table XII is a table of relevant parameter values of the wide-angle lens 7 of the seventh embodiment and their calculated values corresponding to the conditions (11) to (19). It can be seen from Table XII that the wide-angle lens 7 of the seventh embodiment can meet the requirements of the conditions (11) to (19).

[0120] Table XII

[0121]

[0122] In addition, the optical performance of the wide-angle lens 7 of the seventh embodiment can also meet the requirements. From Figure 14 it can be seen that the longitudinal aberration of the wide-angle lens 7 of the seventh embodiment is between -0.01 mm and 0.01 mm. From Figure 15 it can be seen that the field curvature of the wide-angle lens 7 of the seventh embodiment is between -0.025 mm and 0.015 mm. From Figure 16It can be seen that the distortion of the wide-angle lens 7 of the seventh embodiment is between -100% and 0%. Obviously, the longitudinal aberration, field curvature, and distortion of the wide-angle lens 7 of the seventh embodiment can all be effectively corrected, thereby obtaining better optical performance.

[0123] Now, a detailed description will be given of the eighth embodiment of the wide-angle lens of the present invention. Please refer to Figure 17 , the wide-angle lens 8 sequentially includes a first lens L81, a second lens L82, a third lens L83, an aperture ST8, a fourth lens L84, a fifth lens L85, and a sixth lens L86 along the optical axis OA8 from the object side to the image side. When imaging, the light rays from the object side are finally imaged on the imaging surface IMA8. By using the above lenses, aperture ST8, and a design that satisfies at least one of the conditions (11) to (19), the wide-angle lens 8 can effectively increase the field of view, effectively reduce the total length of the lens, effectively improve the resolution, effectively resist the ambient temperature, and effectively correct the aberration.

[0124] Table XIII is Figure 17 the relevant parameter table of each lens of the wide-angle lens 8 in

[0125] Table XIII

[0126]

[0127]

[0128] Table XIV is the relevant parameter table of the aspherical surfaces of the aspherical lenses in Table XIII.

[0129] Table XIV

[0130]

[0131] Table XV is the relevant parameter values of the wide-angle lens 8 of the eighth embodiment and the calculated values corresponding to the conditions (11) to (19). It can be seen from Table XV that the wide-angle lens 8 of the eighth embodiment can meet the requirements of the conditions (11) to (19).

[0132] Table XV

[0133]

[0134] In addition, the optical performance of the wide-angle lens 8 of the eighth embodiment can also meet the requirements. It can be seen from Figure 18 that the longitudinal aberration of the wide-angle lens 8 of the eighth embodiment is between -0.01 mm and 0.01 mm. It can be seen from Figure 19 that the field curvature of the wide-angle lens 8 of the eighth embodiment is between -0.03 mm and 0.01 mm. It can be seen from Figure 20It can be seen that the distortion of the wide-angle lens 8 of the eighth embodiment is between -100% and 0%. Obviously, the longitudinal aberration, field curvature, and distortion of the wide-angle lens 8 of the eighth embodiment can all be effectively corrected, thereby obtaining better optical performance.

[0135] Now, a ninth embodiment of the wide-angle lens of the present invention will be described in detail. Please refer to Figure 21 , the wide-angle lens 9 sequentially includes a first lens L91, a second lens L92, a third lens L93, an aperture ST9, a fourth lens L94, a fifth lens L95, and a sixth lens L96 along the optical axis OA9 from the object side to the image side. When imaging, the light rays from the object side are finally imaged on the imaging surface IMA9. By using the above lenses, aperture ST9, and a design that satisfies at least one of the conditions (11) to (19), the wide-angle lens 9 can effectively increase the field of view, effectively reduce the total lens length, effectively improve the resolution, effectively resist the ambient temperature, and effectively correct the aberration.

[0136] Table XVI is Figure 21 the relevant parameter table of each lens of the wide-angle lens 9 in

[0137] Table XVI

[0138]

[0139] Table XVII is the relevant parameter table of the aspherical surfaces of the aspherical lenses in Table XVI.

[0140] Table XVII

[0141]

[0142] Table XVIII is the relevant parameter values of the wide-angle lens 9 of the ninth embodiment and their calculated values corresponding to the conditions (11) to (19). It can be seen from Table XVIII that the wide-angle lens 9 of the ninth embodiment can meet the requirements of the conditions (11) to (19).

[0143] Table XVIII

[0144]

[0145] In addition, the optical performance of the wide-angle lens 9 of the ninth embodiment can also meet the requirements. It can be seen from Figure 22 that the longitudinal aberration of the wide-angle lens 9 of the ninth embodiment is between -0.02 mm and 0.01 mm. It can be seen from Figure 23 that the field curvature of the wide-angle lens 9 of the ninth embodiment is between -0.035 mm and 0 mm. It can be seen from Figure 24 that the distortion of the wide-angle lens 9 of the ninth embodiment is between -100% and 0%. Obviously, the longitudinal aberration, field curvature, and distortion of the wide-angle lens 9 of the ninth embodiment can all be effectively corrected, thereby obtaining better optical performance.

[0146] Now, a tenth embodiment of the wide-angle lens of the present invention will be described in detail. Please refer to Figure 25 , the wide-angle lens 10 sequentially includes a first lens L101, a second lens L102, a third lens L103, an aperture ST10, a fourth lens L104, a fifth lens L105, and a sixth lens L106 along the optical axis OA10 from the object side to the image side. When imaging, the light rays from the object side are finally imaged on the imaging surface IMA10. By using the above lenses, aperture ST10 and a design that satisfies at least one of the conditions (11) to (19), the wide-angle lens 10 can effectively improve the field of view, effectively reduce the total length of the lens, effectively improve the resolution, effectively resist the ambient temperature, and effectively correct the aberration.

[0147] Table XIX is Figure 25 the relevant parameter table of each lens of the wide-angle lens 10 in

[0148] Table XIX

[0149]

[0150]

[0151] Table XX is the relevant parameter table of the aspherical surfaces of the aspherical lenses in Table XIX.

[0152] Table XX

[0153]

[0154] Table XXI is the relevant parameter values of the wide-angle lens 10 of the tenth embodiment and the calculated values corresponding to the conditions (11) to (19). It can be seen from Table XXI that the wide-angle lens 10 of the tenth embodiment can meet the requirements of the conditions (11) to (19).

[0155] Table XXI

[0156]

[0157] It should be noted that although not explicitly shown in the table, the above first to sixth embodiments can also meet part or all of the above conditional expressions (11)-(19); the above seventh to tenth embodiments can also meet part or all of the above conditional expressions (1)-(10), which can be obtained by calculating the data disclosed in each embodiment.

[0158] Although the present invention has been disclosed above in a preferred embodiment, it is not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the defined claims.

Claims

1. A wide-angle lens, characterized in that: include: A first lens having negative refractive power; a second lens having refractive power and comprising a concave surface facing the object side; a third lens having positive refractive power; a fourth lens having refractive power; a fifth lens having refractive power; a sixth lens having refractive power; The wide-angle lens meets at least one of the following conditions: -70≤R21 / d45≤-18; 5mm 2 ≤(Ra-R21)×d45≤11mm 2 ; -2.95≤R62 / T6≤-2.01; 0.35≤(R11-R12) / TTL≤0.61; 1.86≤BFL / f≤1.99; 0.47≤f / AAG≤0.76; 4.5 <L / f<6.9; 3.4 <R11 / f<5.5; Wherein, f is the effective focal length of the wide-angle lens, R11 is the curvature radius of the object side of the first lens, R12 is the curvature radius of the image side of the first lens, R21 is the curvature radius of the object side of the second lens, R62 is the curvature radius of the image side of the sixth lens, d45 is the distance between the aperture and the object side, from the image side of the lens second closest to the aperture to the object side of the lens closest to the aperture on the optical axis, and Ra is the distance between the aperture and the imaging surface, from the object side of the lens closest to the aperture The radius of curvature is as follows: T6 is the distance from the object side surface of the sixth lens to the image side surface of the sixth lens on the optical axis; TTL is the distance from the object side surface of the first lens to the imaging plane on the optical axis; BFL is the distance from the image side surface of the lens closest to the imaging plane to the imaging plane on the optical axis; AAG is the sum of the air distances between the first lens and the lens closest to the imaging plane on the optical axis; L is the distance from the object side surface of the first lens to the image side surface of the lens closest to the imaging plane on the optical axis.

2. The wide-angle lens according to claim 1, characterized in that: The fourth lens has positive refractive power; The fifth lens has negative refractive power; The sixth lens has positive refractive power.

3. The wide-angle lens according to claim 2, characterized in that: The first lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side; The third lens comprises a convex surface facing the object side; The fourth lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the image side; The fifth lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side; The sixth lens is a meniscus lens and further includes a convex surface facing the object side.

4. The wide-angle lens according to claim 2, wherein: The third lens is a biconvex lens and further includes a convex surface facing the image side.

5. The wide-angle lens according to claim 2, wherein: The third lens is a meniscus lens and further includes a concave surface facing the image side.

6. The wide-angle lens according to claim 2, characterized in that: The second lens has positive refractive power and includes a convex surface facing the image side; The sixth lens includes a concave surface facing the image side.

7. The wide-angle lens according to claim 2, characterized in that: The second lens has negative refractive power and includes a concave surface facing the image side; The sixth lens includes a convex surface facing the image side.

8. The wide-angle lens according to claim 2, wherein: The optical system further includes a seventh lens, which is a plano-convex lens and includes a convex surface facing the object side and a flat surface facing the image side.

9. The wide-angle lens according to any one of claims 1 to 8, characterized in that: The wide-angle lens meets at least one of the following conditions: 2.5mm≤Ra / Nd4≤15mm; 5≤Ra / d67≤62; 2mm≤Ra+Rd≤19mm; -1mm <fb+Rc<2mm; 0.14 <Ra / fc<6.62; 3mm -1< Vdb / Rc<7mm -1 ; 0.14mm <Ra / Vdb<1.34mm; -2.3 <f1 / f<-1.5; -38.3 <Vdd / (fc / fb)<-15.2; 0.14 <f / TTL<0.18; 3.1 <TTL / BFL<8.1; Wherein, Ra is the curvature radius of the object side of the lens closest to the aperture between the aperture and the imaging plane, Rd is the curvature radius of the object side of the lens second closest to the imaging plane, Nd4 is the refractive index of the lens closest to the aperture between the aperture and the imaging plane, d67 is the distance between the image side of the lens closest to the aperture between the object side and the aperture and the aperture on the optical axis, f is the effective focal length of the wide-angle lens, f1 is the effective focal length of the first lens, fb is the effective focal length of the lens second closest to the aperture between the aperture and the imaging plane, fc is the effective focal length of the lens closest to the imaging plane, TTL is the effective focal length of the first lens The distance between the object side surface of the lens and the imaging plane on the optical axis, BFL is the distance between the image side surface of the seventh lens and the imaging plane on the optical axis, L is the distance between the object side surface of the first lens and the image side surface of the lens closest to the imaging plane on the optical axis, Ra is the curvature radius of the object side surface of the lens closest to the aperture and the imaging plane, Rc is the curvature radius of the object side surface of the lens closest to the imaging plane, Vdb is the Abbe coefficient of the lens second closest to the aperture between the aperture and the imaging plane, Vdd is the Abbe coefficient of the lens second closest to the imaging plane, and R11 is the curvature radius of the object side surface of the first lens.

10. The wide-angle lens according to claim 9, wherein: A seventh lens is further included. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence from the object side to the image side along the optical axis.

Images