An optical imaging lens

Abstract

This invention relates to the field of lens technology. The invention discloses an optical imaging lens comprising six lenses: a first lens is a convex-concave lens with negative refractive index; a second lens has negative refractive index with its object-side surface convex near the optical axis and its image-side surface concave; the third, fourth, and sixth lenses are all convex-convex lenses with positive refractive index; and the fifth lens is a concave-concave lens with negative refractive index. The first and third lenses are both glass spherical lenses, while the second, fourth, fifth, and sixth lenses are all plastic aspherical lenses. This invention offers advantages such as shorter overall lens length, smaller size, lower cost, wide angle of view, good image quality, and low temperature drift.

Description

Technical Field

[0001] This invention belongs to the field of lens technology, and specifically relates to an optical imaging lens. Background Technology

[0002] With the continuous advancement of technology and the continuous improvement of living standards, optical imaging lenses have also developed rapidly in recent years. Optical imaging lenses are widely used in various fields such as smartphones, tablets, vehicle monitoring, security monitoring, drone aerial photography, machine vision systems, and video conferencing. Therefore, the requirements for optical imaging lenses are also getting higher and higher.

[0003] However, there are still many shortcomings in the optical imaging lenses currently on the market. For example, in order to improve resolution and correct chromatic aberration, existing large field-of-view optical imaging lenses often use multiple glass or cemented lenses. The large number of lenses results in an excessively long total optical length (TTL), an excessively large size, and limitations in installation and use, as well as an excessively high overall cost. The lenses also have a large temperature drift, which affects image quality when the temperature disturbance is too large. Furthermore, the imaging quality at the edge of the field of view is poor. Therefore, it is necessary to improve these lenses to meet the increasingly higher requirements of consumers. Summary of the Invention

[0004] The purpose of this invention is to provide an optical imaging lens to solve the aforementioned technical problems.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an optical imaging lens, comprising a first lens to a sixth lens in sequence along an optical axis from the object side to the image side; each of the first lens to the sixth lens includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through.

[0006] The first lens has a negative refractive index, the object side of the first lens is convex, and the image side of the first lens is concave.

[0007] The second lens has a negative refractive index. The object side of the second lens is convex near the optical axis, and the image side of the second lens is concave.

[0008] The third lens has a positive refractive index, and the object-side surface of the third lens is convex, as is the image-side surface of the third lens.

[0009] The fourth lens has a positive refractive index, and the object-side surface of the fourth lens is convex, as is the image-side surface of the fourth lens.

[0010] The fifth lens has a negative refractive index, and the object-side surface of the fifth lens is concave, as is the image-side surface of the fifth lens.

[0011] The sixth lens has a positive refractive index, and the object-side surface of the sixth lens is convex, as is the image-side surface of the sixth lens.

[0012] Both the first lens and the third lens are glass spherical lenses, and the second lens, the fourth lens, the fifth lens, and the sixth lens are all plastic aspherical lenses;

[0013] The optical imaging lens has only the above-mentioned first lens to sixth lens with refractive power.

[0014] Furthermore, the optical imaging lens also satisfies: -7.00mm < f1 < -5.50mm, -5.00mm < f2 < -4.00mm, 4.00mm < f3 < 6.00mm, 4.00mm < f4 < 5.00mm, -4.00mm < f5 < -2.00mm, 4.00mm < f6 < 5.00mm, where f1, f2, f3, f4, f5, and f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens, respectively.

[0015] Furthermore, the optical imaging lens also satisfies: 2.00 < |f1 / f| < 3.00, 1.00 < |f2 / f| < 2.50, 1.00 < |f3 / f| < 3.00, 1.50 < |f4 / f| < 2.50, 1.00 < |f5 / f| < 2.00, 1.00 < |f6 / f| < 2.50, where f is the overall focal length of the optical imaging lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

[0016] Furthermore, the optical imaging lens also satisfies: 1.70 < nd1 < 2.00, 20.00 < vd1 < 50.00; 1.50 < nd2 < 1.70, 50.00 < vd2 < 60.00; 1.70 < nd3 < 1.85, 20.00 < vd3 < 30.00; 1.50 < nd4 < 1.70, 50.00 < vd4 < 70.00; 1.60 < nd5 < 1.70, 18.00 < vd5 < 25.00; 1.50 < nd6 < 1.70, 50.00 < vd6 < 60.00, where nd1 - nd6 are the refractive indices of the first lens to the sixth lens, and vd1 - vd6 are the dispersion coefficients of the first lens to the sixth lens, respectively.

[0017] Furthermore, the optical imaging lens also satisfies: R31 = R32, where R31 and R32 are the curvature radii of the object side and the image side of the third lens, respectively.

[0018] Furthermore, it also includes an aperture, and the aperture is arranged between the third lens and the fourth lens.

[0019] Furthermore, this optical imaging lens also meets the following requirements: 2.00 <f 前 / f 后 <3.00, where f 前 f is the combined focal length of the first, second, and third lenses. 后 It is the combined focal length of the fourth, fifth, and sixth lenses.

[0020] Furthermore, the optical imaging lens also satisfies: 0.1 < Φ4 + Φ5 + Φ6, where Φ4, Φ5, and Φ6 are the optical powers of the fourth, fifth, and sixth lenses, respectively.

[0021] Furthermore, this optical imaging lens also meets the following requirements: 5.00 <f 前 / f<7.00, where f 前 Let f be the combined focal length of the first lens, the second lens, and the third lens, and let f be the overall focal length of the optical imaging lens.

[0022] Furthermore, the second, fourth, fifth, and sixth lenses are all high-order even-order aspherical lenses.

[0023] Beneficial technical effects of the present invention:

[0024] This invention employs a combination of two glass spherical lenses and four plastic aspherical lenses. Through appropriate design of each lens, it features a shorter overall lens length, smaller size, convenient installation and use, lower cost, a large field of view, good image quality, and low temperature drift, ensuring good working performance under different temperature conditions. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0027] Figure 2 This is the MTF diagram of Embodiment 1 of the present invention under visible light (435-650nm).

[0028] Figure 3 This is a defocus curve of 63 lp / mm in visible light 435-650 nm according to Embodiment 1 of the present invention;

[0029] Figure 4This is a lateral color difference curve of Embodiment 1 of the present invention in the visible light range of 435nm-650nm;

[0030] Figure 5 This is a longitudinal color difference curve of Embodiment 1 of the present invention in the visible light range of 435nm-650nm;

[0031] Figure 6 This is a field curvature and distortion curve of Embodiment 1 of the present invention in the visible light range of 435nm-650nm;

[0032] Figure 7 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0033] Figure 8 This is the MTF diagram of Embodiment 2 of the present invention under visible light 435-650nm;

[0034] Figure 9 This is a defocus curve of 63 lp / mm in visible light 435-650 nm according to Embodiment 2 of the present invention;

[0035] Figure 10 This is a lateral color difference curve of Embodiment 2 of the present invention in the visible light range of 435nm-650nm;

[0036] Figure 11 This is a longitudinal color difference curve of Embodiment 2 of the present invention in the visible light range of 435nm-650nm;

[0037] Figure 12 This is a field curvature and distortion curve of Embodiment 2 of the present invention in the visible light range of 435nm-650nm;

[0038] Figure 13 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0039] Figure 14 This is the MTF diagram of Embodiment 3 of the present invention under visible light 435-650nm;

[0040] Figure 15 This is a defocus curve of 63 lp / mm in visible light 435-650 nm according to Embodiment 3 of the present invention;

[0041] Figure 16 This is a lateral color difference curve of Embodiment 3 of the present invention in the visible light range of 435nm-650nm;

[0042] Figure 17 This is a longitudinal color difference curve of Embodiment 3 of the present invention in the visible light range of 435nm-650nm;

[0043] Figure 18This is a field curvature and distortion curve diagram of Embodiment 3 of the present invention under visible light 435nm-650nm. Detailed Implementation

[0044] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0045] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0046] The phrase "a lens has a positive (or negative) refractive index" refers to the lens having a positive (or negative) paraxial refractive index calculated using Gaussian optics theory. The "object-side surface (or image-side surface)" is defined as the specific area through which imaging rays pass on the lens surface. The convexity or concavity of a lens surface can be determined using methods commonly employed in the field, namely by the sign of the radius of curvature (R-value). R-values ​​are commonly used in optical design software such as Zemax or CodeV. R-values ​​are also frequently found in lens data sheets within optical design software. For the object-side surface, a positive R-value indicates a convex surface, while a negative R-value indicates a concave surface. Conversely, for the image-side surface, a positive R-value indicates a concave surface, while a negative R-value indicates a convex surface.

[0047] The present invention discloses an optical imaging lens, which includes a first lens to a sixth lens in sequence along an optical axis from the object side to the image side; each of the first lens to the sixth lens includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through.

[0048] The first lens has a negative refractive index, the object side of the first lens is convex, and the image side of the first lens is concave.

[0049] The second lens has a negative refractive index. The object side of the second lens is convex near the optical axis, and the image side of the second lens is concave.

[0050] The third lens has a positive refractive index, and both the object-side and image-side surfaces of the third lens are convex.

[0051] The fourth lens has a positive refractive index, and both the object-side and image-side surfaces of the fourth lens are convex.

[0052] The fifth lens has a negative refractive power. The object side of the fifth lens is concave, and the image side of the fifth lens is concave.

[0053] The sixth lens has a positive refractive power. The object side of the sixth lens is convex, and the image side of the sixth lens is convex.

[0054] Both the first lens and the third lens are glass spherical lenses, and the second lens, the fourth lens, the fifth lens, and the sixth lens are all plastic aspherical lenses, which is beneficial to correcting the secondary spectrum and high-order aberrations, and can well correct the temperature drift of the lens, and can well ensure the working state under different temperature conditions.

[0055] The optical imaging lens with refractive power only includes the above-mentioned first lens to sixth lens.

[0056] The present invention adopts a design combining two glass spherical lenses and four plastic aspherical lenses, and through corresponding designs for each lens, it has the advantages of a shorter overall length of the lens, a small volume, convenient installation and use, and a low cost; a large field of view angle and good imaging quality; a small temperature drift, and can well ensure the working state under different temperature conditions.

[0057] Preferably, the optical imaging lens also satisfies: -7.00mm < f1 < -5.50mm, -5.00mm < f2 < -4.00mm, 4.00mm < f3 < 6.00mm, 4.00mm < f4 < 5.00mm, -4.00mm < f5 < -2.00mm, 4.00mm < f6 < 5.00mm, where f1, f2, f3, f4, f5, and f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens respectively, so that the distribution of the optical power of the lens is uniform and reasonable, and the imaging quality is further improved.

[0058] Preferably, the optical imaging lens also satisfies: 2.00 < |f1 / f| < 3.00, 1.00 < |f2 / f| < 2.50, 1.00 < |f3 / f| < 3.00, 1.50 < |f4 / f| < 2.50, 1.00 < |f5 / f| < 2.00, 1.00 < |f6 / f| < 2.50, where f is the overall focal length of the optical imaging lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens, so that the distribution of the optical power of the lens is uniform and reasonable, and the imaging quality is further improved.

[0059] Preferably, the optical imaging lens further satisfies: 1.70 < nd1 < 2.00, 20.00 < vd1 < 50.00; 1.50 < nd2 < 1.70, 50.00 < vd2 < 60.00; 1.70 < nd3 < 1.85, 20.00 < vd3 < 30.00; 1.50 < nd4 < 1.70, 50.00 < vd4 < 70.00; 1.60 < nd5 < 1.70, 18.00 < vd5 < 25.00; 1.50 < nd6 < 1.70, 50.00 < vd6 < 60.00, where nd1 - nd6 are the refractive indices of the first lens to the sixth lens respectively, and vd1 - vd6 are the dispersion coefficients of the first lens to the sixth lens respectively, further optimizing chromatic aberration and spherical aberration and improving imaging quality; both the first lens and the third lens are made of glass materials with high refractive indices, which can better optimize the optical structure, facilitate the lens structure design, reduce the total length of the lens, and lower the lens cost.

[0060] Preferably, the optical imaging lens further satisfies: |R31| = |R32|, where R31 and R32 are the curvature radii of the object side and the image side of the third lens respectively, which helps in the lens grinding process of the third lens and improves the manufacturing yield; in addition, it can reduce the sensitivity problems such as eccentricity and tilt during the lens assembly process.

[0061] Preferably, it further includes an aperture, and the aperture is arranged between the third lens and the fourth lens to further improve the overall performance.

[0062] More preferably, the optical imaging lens further satisfies: 2.00 < f 前 / f 后 <3.00, where f 前 is the combined focal length of the first lens, the second lens and the third lens, and f 后 is the combined focal length of the fourth lens, the fifth lens and the sixth lens. Controlling the focal length ratio of the front and rear groups of lenses can more effectively balance the spherical aberration of the front and rear groups, making the lens have better imaging quality.

[0063] Preferably, the optical imaging lens further satisfies: 0.1 < Φ4 + Φ5 + Φ6, where Φ4, Φ5 and Φ6 are the optical powers of the fourth lens, the fifth lens and the sixth lens respectively, which can more effectively correct the astigmatism problem of the lens, making the imaging of the lens more uniform in the meridional direction and the sagittal direction.

[0064] Preferably, the optical imaging lens further satisfies: 5.00 < f 前 / f < 7.00, where f 前The focal length of the combination of the first lens, the second lens, and the third lens is denoted by f, which is the overall focal length of the optical imaging lens. This is beneficial for controlling the convergence of light in the front group of the lens, ensuring the wide-angle capability of the lens, and giving the system a better field of view.

[0065] Preferably, the second, fourth, fifth, and sixth lenses are all high-order even-order aspherical lenses, which further optimize chromatic aberration and aberration, and improve imaging quality.

[0066] The optical imaging lens of the present invention will now be described in detail with reference to specific embodiments.

[0067] Example 1

[0068] like Figure 1 As shown, an optical imaging lens includes, along the optical axis I from the object side A1 to the image side A2, a first lens 1, a second lens 2, a third lens 3, an aperture 7, a fourth lens 4, a fifth lens 5, a sixth lens 6, a protective glass 8, and an imaging surface 9. Each of the first lens 1 to the sixth lens 6 includes an object side facing the object side A1 and allowing imaging light to pass through, and an image side facing the image side A2 and allowing imaging light to pass through.

[0069] The first lens 1 has a negative refractive index, the object side 11 of the first lens 1 is convex, and the image side 12 of the first lens 1 is concave.

[0070] The second lens 2 has a negative refractive index. The object side 21 of the second lens 2 is convex near the optical axis, and the image side 22 of the second lens 2 is concave.

[0071] The third lens 3 has a positive refractive index, the object side 31 of the third lens 3 is convex, and the image side 32 of the third lens 3 is convex.

[0072] The fourth lens 4 has a positive refractive index. The object side 41 of the fourth lens 4 is convex, and the image side 42 of the fourth lens 4 is convex.

[0073] The fifth lens 5 has a negative refractive index. The object side 51 of the fifth lens 5 is concave, and the image side 52 of the fifth lens 5 is concave.

[0074] The sixth lens 6 has a positive refractive index, the object side 61 of the sixth lens 6 is convex, and the image side 62 of the sixth lens 6 is convex.

[0075] The first lens 1 and the third lens 3 are both glass spherical lenses, while the second lens 2, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are all plastic aspherical lenses.

[0076] In this specific embodiment, the aperture stop 7 is disposed between the third lens 3 and the fourth lens 4, but it is not limited thereto. In other embodiments, the aperture stop 7 may also be disposed in other suitable positions.

[0077] Detailed optical data for this specific embodiment are shown in Table 1-1.

[0078] Table 1-1 Detailed optical data for Example 1

[0079] surface Diameter / mm radius of curvature / mm Thickness / Gap / mm Material Refractive index dispersion coefficient Focal length / mm - Infinity Infinity 11 First lens 12.328 15.358 1.100 Glass 1.91 31.32 -6.849 12 7.525 4.279 2.918 21 Second lens 6.837 15.413 1.288 plastic 1.54 55.98 -4.734 22 5.111 2.124 0.877 31 Third lens 8.000 6.650 4.944 Glass 1.79 25.72 5.034 32 8.000 -6.650 0.221 7 Aperture 3.250 Infinity 0.537 41 Fourth lens 3.578 4.698 1.557 plastic 1.55 56.00 4.516 42 3.828 -4.587 0.145 51 Fifth lens 3.827 -2.970 0.800 plastic 1.67 20.38 -3.017 52 4.371 6.918 0.605 61 Sixth lens 6.022 3.737 2.722 plastic 1.55 56.00 4.633 62 5.765 -5.823 3.214 8 Protective glass 6.424 Infinity 0.700 Glass 1.52 64.20 Infinity - 6.509 Infinity 0.372 9 Imaging surface 6.390 Infinity 0.000

[0080] In this specific embodiment, the object side surface 21, object side surface 41, object side surface 51, object side surface 61, image side surface 22, image side surface 42, image side surface 52, and image side surface 62 are defined according to the following aspherical curve formula:

[0081]

[0082] in:

[0083] r is the distance from a point on the optical surface to the optical axis.

[0084] z is the sag of the point along the optical axis.

[0085] c is the curvature of the surface.

[0086] K is the quadratic surface constant of the surface.

[0087] A4, A6, A8, A 10 A 12 A 14 A 16 These are the aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively.

[0088] Please refer to the table below for detailed parameter data for each aspherical surface:

[0089] Face number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> 21 -0.63 -2.417E-02 3.522E-03 -3.373E-04 2.413E-05 -1.296E-06 4.460E-08 -6.686E-10 22 -1.18 -2.514E-02 5.159E-03 2.350E-04 -4.026E-04 1.112E-04 -1.387E-05 6.676E-07 41 -2.04 -5.388E-04 -1.326E-03 2.757E-06 6.787E-04 -4.507E-04 1.218E-04 -1.214E-05 42 -12.90 -1.978E-02 3.851E-03 2.917E-03 -4.592E-03 2.475E-03 -5.897E-04 5.204E-05 51 0.20 2.648E-02 5.142E-03 -9.950E-03 5.100E-03 -1.152E-03 1.034E-04 -1.771E-06 52 -41.50 2.208E-02 -1.836E-03 -1.409E-03 6.211E-04 -9.684E-05 2.927E-06 3.431E-07 61 -10.41 3.504E-03 -3.350E-04 5.352E-06 3.669E-05 -6.418E-06 4.176E-07 -8.931E-09 62 2.70 -1.807E-04 3.839E-04 1.219E-05 1.539E-05 -3.514E-06 4.025E-07 -6.425E-09

[0090] Please refer to Table 4 for the numerical values ​​of the relevant conditional expressions in this specific embodiment.

[0091] For details of the MTF curve of this specific embodiment, please refer to [link / reference]. Figure 2 As can be seen, the image quality is greater than 0.4 across the entire field of view at 125 lp / mm, indicating high resolution and good image quality; please refer to the defocus curve diagram. Figure 3 For details on the lateral color difference diagram, please refer to [link / reference]. Figure 4 For details of the longitudinal color difference diagram, please refer to [link / reference]. Figure 5 As can be seen, chromatic aberration and aberration are well corrected, resulting in high image quality; for field curvature and distortion diagrams, please refer to [link to diagram]. Figure 6 From (A) and (B), it can be seen that the field curvature and distortion are both good.

[0092] In this specific embodiment, the focal length of the optical imaging lens is f = 2.51 mm; the field of view (FOV) is 173.2°; the aperture value (FNO) is 2.0; and the distance (TTL) between the object surface 11 of the first lens 1 and the imaging surface 9 on the optical axis I is 22.000 mm.

[0093] This embodiment demonstrates good imaging performance across different temperature ranges.

[0094] Example 2

[0095] like Figure 7 As shown, the surface concavity and convexity and refractive index of each lens in this embodiment are roughly the same as those in Embodiment 1, with only the optical parameters such as the radius of curvature and lens thickness of each lens surface being different.

[0096] Detailed optical data for this specific embodiment are shown in Table 2-1.

[0097] Table 2-1 Detailed optical data for Example 2

[0098]

[0099]

[0100] Please refer to the table below for detailed parameter data of each aspherical surface in this specific embodiment:

[0101] Face number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 <!-- 6 -->]]> 21 -0.25 -2.415E-02 3.524E-03 -3.372E-04 2.412E-05 -1.297E-06 4.455E-08 -6.618E-10 22 -1.18 -2.512E-02 5.175E-03 2.377E-04 -4.024E-04 1.112E-04 -1.387E-05 6.674E-07 41 -2.17 -4.719E-04 -1.335E-03 -1.367E-07 6.803E-04 -4.501E-04 1.218E-04 -1.227E-05 42 -12.51 -2.004E-02 3.816E-03 2.913E-03 -4.592E-03 2.475E-03 -5.899E-04 5.201E-05 51 0.20 2.648E-02 5.130E-03 -9.959E-03 5.098E-03 -1.152E-03 1.034E-04 -1.790E-06 52 -40.91 2.212E-02 -1.821E-03 -1.406E-03 6.214E-04 -9.680E-05 2.932E-06 3.395E-07 61 -10.40 3.514E-03 -3.333E-04 5.548E-06 3.672E-05 -6.417E-06 4.176E-07 -8.966E-09 62 2.70 -1.304E-04 3.774E-04 1.103E-05 1.530E-05 -3.513E-06 4.035E-07 -6.217E-09

[0102] Please refer to Table 4 for the numerical values ​​of the relevant conditional expressions in this specific embodiment.

[0103] For details of the MTF curve of this specific embodiment, please refer to [link / reference]. Figure 8 As can be seen, the image quality is greater than 0.4 across the entire field of view at 125 lp / mm, indicating high resolution and good image quality; please refer to the defocus curve diagram. Figure 9 For details on the lateral color difference diagram, please refer to [link / reference]. Figure 10 For details of the longitudinal color difference diagram, please refer to [link / reference]. Figure 11 As can be seen, chromatic aberration and aberration are well corrected, resulting in high image quality; for field curvature and distortion diagrams, please refer to [link to diagram]. Figure 12 From (A) and (B), it can be seen that the field curvature and distortion are both good.

[0104] In this specific embodiment, the focal length of the optical imaging lens is f = 2.52 mm; the field of view (FOV) is 173.2°; the aperture value (FNO) is 2.0; and the distance (TTL) between the object surface 11 of the first lens 1 and the imaging surface 9 on the optical axis I is 21.902 mm.

[0105] This embodiment demonstrates good imaging performance across different temperature ranges.

[0106] Example 3

[0107] like Figure 13 As shown, the surface concavity and convexity and refractive index of each lens in this embodiment are roughly the same as those in Embodiment 1, with only the optical parameters such as the radius of curvature and lens thickness of each lens surface being different.

[0108] Detailed optical data for this specific embodiment are shown in Table 3-1.

[0109] Table 3-1 Detailed optical data for Example 3

[0110] surface Diameter / mm radius of curvature / mm Thickness / Gap / mm Material Refractive index dispersion coefficient Focal length / mm - Infinity Infinity 11 First lens 12.473 15.287 1.228 Glass 1.91 31.32 -6.912 12 7.493 4.282 2.875 21 Second lens 6.777 15.386 1.297 plastic 1.54 55.98 -4.722 22 5.025 2.118 0.873 31 Third lens 5.049 6.653 4.957 Glass 1.81 25.46 4.924 32 3.892 -6.653 0.128 7 Aperture 3.217 Infinity 0.439 41 Fourth lens 3.496 4.674 1.536 plastic 1.54 55.98 4.579 42 3.715 -4.622 0.143 51 Fifth lens 3.717 -2.967 0.812 plastic 1.67 20.38 -3.021 52 4.241 6.970 0.568 61 Sixth lens 5.878 3.694 2.727 plastic 1.55 56.00 4.604 62 5.710 -5.825 3.274 8 Protective glass 6.491 Infinity 0.700 Glass 1.52 64.20 Infinity - 6.585 Infinity 0.223 9 Imaging surface 6.431 Infinity 0.000

[0111] Please refer to the table below for detailed parameter data of each aspherical surface in this specific embodiment:

[0112] Face number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> 21 0.17 -2.415E-02 3.524E-03 -3.373E-04 2.413E-05 -1.297E-06 4.451E-08 -6.683E-10 22 -1.17 -2.507E-02 5.197E-03 2.402E-04 -4.019E-04 1.111E-04 -1.387E-05 6.679E-07 41 -2.17 -4.735E-04 -1.333E-03 -5.396E-06 6.801E-04 -4.500E-04 1.217E-04 -1.227E-05 42 -12.53 -2.002E-02 3.815E-03 2.912E-03 -4.590E-03 2.473E-03 -5.898E-04 5.203E-05 51 0.20 2.650E-02 5.129E-03 -9.964E-03 5.100E-03 -1.151E-03 1.035E-04 -1.831E-06 52 -40.80 2.215E-02 -1.815E-03 -1.406E-03 6.214E-04 -9.676E-05 2.932E-06 3.421E-07 61 -10.33 3.511E-03 -3.327E-04 5.753E-06 3.673E-05 -6.417E-06 4.173E-07 -9.003E-09 62 2.71 -1.267E-04 3.775E-04 1.124E-05 1.534E-05 -3.510E-06 4.037E-07 -6.333E-09

[0113] Please refer to Table 4 for the numerical values ​​of the relevant conditional expressions in this specific embodiment.

[0114] For details of the MTF curve of this specific embodiment, please refer to [link / reference]. Figure 14 As can be seen, the image quality is greater than 0.4 across the entire field of view at 125 lp / mm, indicating high resolution and good image quality; please refer to the defocus curve diagram. Figure 15 For details on the lateral color difference diagram, please refer to [link / reference]. Figure 16 For details of the longitudinal color difference diagram, please refer to [link / reference]. Figure 17 As can be seen, chromatic aberration and aberration are well corrected, resulting in high image quality; for field curvature and distortion diagrams, please refer to [link to diagram]. Figure 18 From (A) and (B), it can be seen that the field curvature and distortion are both good.

[0115] In this specific embodiment, the focal length of the optical imaging lens is f = 2.52 mm; the field of view (FOV) is 172.0°; the aperture value (FNO) is 2.0; and the distance (TTL) between the object surface 11 of the first lens 1 and the imaging surface 9 on the optical axis I is 21.780 mm.

[0116] This embodiment demonstrates good imaging performance across different temperature ranges.

[0117] Table 4. Values ​​of relevant important parameters in three embodiments of the present invention.

[0118] Example 1 Example 2 Example 3 f1 -6.849 -6.852 -6.912 f2 -4.734 -4.749 -4.722 f3 5.034 5.037 4.924 f4 4.516 4.548 4.579 f5 -3.017 -3.020 -3.021 f6 4.633 4.616 4.604 f 2.51 2.52 2.524 |f1 / f| 2.73 2.72 2.74 |f2 / f| 1.89 1.88 1.87 |f3 / f| 2.01 2.00 1.95 |f4 / f| 1.80 1.80 1.81 |f5 / f| 1.20 1.20 1.20 |f6 / f| 1.85 1.83 1.82 <![CDATA[2.00<f 前 / f 后 <3.00]]> 2.485 2.513 2.13 0.1<Φ4+Φ5+Φ6 0.106 0.105 0.104 <![CDATA[5.00<f 前 / f<7.00]]> 6.824 6.900 5.852

[0119] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. An optical imaging lens, which sequentially includes a first lens to a sixth lens along an optical axis from the object side to the image side; the first lens to the sixth lens each include an object side facing the object side and allowing imaging light to pass through and an image side facing the image side and allowing imaging light to pass through; characterized in that: The first lens has a negative refractive power, the object side of the first lens is convex, and the image side of the first lens is concave; The second lens has a negative refractive power, the object side of the second lens is convex near the optical axis, and the image side of the second lens is concave; The third lens has a positive refractive power, the object side of the third lens is convex, and the image side of the third lens is convex; The fourth lens has a positive refractive power, the object side of the fourth lens is convex, and the image side of the fourth lens is convex; The fifth lens has a negative refractive power, the object side of the fifth lens is concave, and the image side of the fifth lens is concave; The sixth lens has a positive refractive power, the object side of the sixth lens is convex, and the image side of the sixth lens is convex; Both the first lens and the third lens are glass spherical lenses, and the second lens, the fourth lens, the fifth lens and the sixth lens are all plastic aspherical lenses; The lenses with refractive power in this optical imaging lens are only the above-mentioned first lens to the sixth lens; This optical imaging lens also satisfies: 2.00 < |f1 / f| < 3.00, 1.00 < |f2 / f| < 2.50, 1.00 < |f3 / f| < 3.00, 1.50 < |f4 / f| < 2.50, 1.00 < |f5 / f| < 2.00, 1.00 < |f6 / f| < 2.50, where f is the overall focal length of this optical imaging lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

2. The optical imaging lens according to claim 1, characterized in that, This optical imaging lens also satisfies: -7.00 mm < f1 < -5.50 mm, -5.00 mm < f2 < -4.00 mm, 4.00 mm < f3 < 6.00 mm, 4.00 mm < f4 < 5.00 mm, -4.00 mm < f5 < -2.00 mm, 4.00 mm < f6 < 5.00 mm.

3. The optical imaging lens according to claim 1, characterized in that, This optical imaging lens also satisfies: 1.70 < nd1 < 2.00, 20.00 < vd1 < 50.00; 1.50 < nd2 < 1.70, 50.00 < vd2 < 60.00; 1.70 < nd3 < 1.85, 20.00 < vd3 < 30.00; 1.50 < nd4 < 1.70, 50.00 < vd4 < 70.00; 1.60 < nd5 < 1.70, 18.00 < vd5 < 25.00; 1.50 < nd6 < 1.70, 50.00 < vd6 < 60.00, where nd1 - nd6 are the refractive indices of the first lens to the sixth lens respectively, and vd1 - vd6 are the dispersion coefficients of the first lens to the sixth lens respectively.

4. The optical imaging lens according to claim 1, characterized in that, This optical imaging lens also satisfies: |R31| = |R32|, where R31 and R32 are the curvature radii of the object side and the image side of the third lens respectively.

5. The optical imaging lens according to claim 1, characterized in that, It also includes an aperture stop, which is positioned between the third and fourth lenses.

6. The optical imaging lens according to claim 5, characterized in that, The optical imaging lens also meets the following requirement: 2.00 <f 前 / f 后 <3.00, where f 前 f is the combined focal length of the first, second, and third lenses. 后 It is the combined focal length of the fourth, fifth, and sixth lenses.

7. The optical imaging lens according to claim 5, characterized in that, The optical imaging lens also satisfies: 0.1 < Φ4 + Φ5 + Φ6, where Φ4, Φ5, and Φ6 are the optical powers of the fourth, fifth, and sixth lenses, respectively.

8. The optical imaging lens according to claim 5, characterized in that, The optical imaging lens also meets the following requirements: 5.00 <f 前 / f<7.00, where f 前 It is the combined focal length of the first lens, the second lens, and the third lens.

9. The optical imaging lens according to claim 1, characterized in that, The second, fourth, fifth, and sixth lenses are all high-order even-order aspherical lenses.

Images