Telephoto lens and electronic equipment

Abstract

The present invention discloses a telephoto lens and an electronic device. The telephoto lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens from the object side to the image side. The object side surface and the image side surface of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all aspherical surfaces. The interval distance TTL of the imaging surface of the telephoto lens on the optical axis and the total effective focal length f of the telephoto lens satisfy 0.8 < TTL / f < 0.9. The total effective focal length f of the telephoto lens and the curvature radius R1 of the object side surface of the first lens and the curvature radius R8 of the image side surface of the fourth lens satisfy 4.0 < f / R1 < 4.6 and 0.3 < f / R8 < 1.4. The telephoto lens and the electronic device in the present invention can improve the resolution of the lens, reduce optical distortion, and ensure relative illumination while ensuring telephoto by controlling parameters such as the center thickness of each lens and the air gap.

Description

Technical Field

[0001] The invention belongs to the technical field of optical lenses, and in particular relates to a telephoto lens and electronic equipment. Background Art

[0002] With the advancement of science and technology and the development of economy, people have higher and higher requirements for the camera function of portable electronic devices (such as tablets, iPads, smart phones, etc.). They not only require the camera module equipped with the electronic device to achieve background blur and clear night shots, but also require the camera module equipped with the electronic device to achieve optical zoom. As a camera module with strong optical zoom capability, the periscope camera module is becoming more and more popular and valued by people.

[0003] In the prior art, the focal length of the periscope camera module is relatively short (2mm to 4mm), and the optical distortion, resolution and relative illumination cannot be effectively guaranteed in the case of a long focal length.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a telephoto lens and an electronic device. Summary of the invention

[0005] The object of the present invention is to provide a telephoto lens and an electronic device.

[0006] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows:

[0007] A telephoto lens, comprising, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the object side surface and the image side surface of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspherical surfaces, wherein:

[0008] The first lens has positive refractive power, and its object side optical axis is convex, and its image side optical axis is convex;

[0009] The second lens has negative optical power, and its object side optical axis is convex, and its image side optical axis is concave;

[0010] The third lens has negative optical power, and its object side optical axis is concave, and its image side optical axis is concave;

[0011] The fourth lens has negative optical power, and its object side surface is concave at the optical axis, its image side surface is concave at the optical axis, and the image side surface has at least one convex surface off-axis;

[0012] The fifth lens has positive refractive power, its object side surface is convex at the optical axis, there is at least one concave surface at the object side surface off-axis, and the image side surface is convex at the optical axis;

[0013] The distance TTL between the imaging surface of the telephoto lens on the optical axis and the total effective focal length f of the telephoto lens satisfy 0.8 < TTL / f < 0.9;

[0014] The total effective focal length f of the telephoto lens, the radius of curvature R1 of the object side surface of the first lens, and the radius of curvature R8 of the image side surface of the fourth lens satisfy 4.0 < f / R1 < 4.6 and 0.3 < f / R8 < 1.4.

[0015] In one embodiment, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy -2.5 < f4 / f1 < -1.5, and the effective focal length f5 of the fifth lens and the total effective focal length f of the telephoto lens satisfy 0.6 < f5 / f < 1.3.

[0016] In one embodiment, the distance TTL between the imaging surface of the telephoto lens on the optical axis is 6.380 mm, and the total effective focal length f of the telephoto lens is 7.08 mm to 7.98 mm.

[0017] In one embodiment, the central thicknesses CT1, CT2, CT3, CT4, CT5 of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens on the optical axis respectively, and the sum of the central thicknesses ∑CT satisfy 1.15 mm ≤ CT1 ≤ 1.205 mm, 0.20 mm ≤ CT2 ≤ 0.24 mm, 0.22 mm ≤ CT3 ≤ 0.24 mm, 0.27 mm ≤ CT4 ≤ 0.35 mm, 0.63 mm ≤ CT5 ≤ 0.67 mm, and 2.50 mm ≤ ∑CT ≤ 2.66 mm.

[0018] In one embodiment, the air gap T23 between the second lens and the third lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, the air gap T45 between the fourth lens and the fifth lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy 4 < (T23 + T34 + T45) / (CT3 + CT4) < 5.5 and CT3 / T34 < 0.2, and the combined focal length f12 of the first lens and the second lens and the central thickness CT1 of the first lens on the optical axis satisfy 3.5 < f12 / CT1 < 4.5.

[0019] In one embodiment, the sum ∑T of the distances between any two adjacent lenses among the first lens to the fifth lens on the optical axis, the air gap T45 between the fourth lens and the fifth lens on the optical axis, and the distance T12 between the first lens and the second lens on the optical axis satisfy 9 < ∑T / (T45 + T12) < 14.5.

[0020] In one embodiment, the center thickness CT5 of the fifth lens on the optical axis, the center thickness CT3 of the third lens on the optical axis and half of the maximum field of view HFOV of the telephoto lens satisfy -2.6 <CT5 / CT3×TAN(HFOV)<-2.2。

[0021] In one embodiment, a curvature radius R1 of the object side surface of the first lens, a curvature radius R8 of the image side surface of the fourth lens, a curvature radius R3 of the object side surface of the second lens, and a curvature radius R4 of the image side surface of the second lens satisfy R1 / R8<0.3, 0.68<(R3-R4) / (R3+R4)<1.

[0022] In one embodiment, the spacing distance TTL between the maximum effective semi-aperture DT11 of the object side surface of the first lens, the maximum effective semi-aperture DT12 of the image side surface of the first lens, the maximum effective semi-aperture DT21 of the object side surface of the second lens, the maximum effective semi-aperture DT22 of the image side surface of the second lens and the imaging plane of the telephoto lens on the optical axis satisfies 1.2<(DT11+DT22) / 2<1.4, 0.8<(DT11+DT12+DT21+DT22) / TTL<0.9.

[0023] In one embodiment, the telephoto lens further includes:

[0024] A filter, located on the image side of the fifth lens;

[0025] A lens barrel, used for encapsulating the first lens, the second lens, the third lens, the fourth lens and the fifth lens;

[0026] A plurality of spacer rings are packaged between the first lens and the second lens, and / or the second lens and the third lens, and / or the third lens and the fourth lens, and / or the fourth lens and the fifth lens.

[0027] The technical solution provided by an embodiment of the present invention is as follows:

[0028] An electronic device is provided with at least one telephoto lens as described above.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] The telephoto lens and the electronic device of the present invention can improve the resolution of the lens, reduce optical distortion, and ensure relative illumination while ensuring the telephoto by controlling parameters such as the center thickness of each lens and the air interval. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 is a schematic structural diagram of a medium-telephoto lens of the present invention;

[0033] Figure 2 Schematic diagram of light transmission of the telephoto lens of the present invention;

[0034] Figure 3 is a resolution curve diagram of the telephoto lens in the first embodiment of the present invention;

[0035] Figure 4 is a distortion curve diagram of the telephoto lens in the first embodiment of the present invention;

[0036] Figure 5 FIG. 4 is a relative illumination curve diagram of the telephoto lens in the first embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention will be described in detail below in conjunction with the various embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0038] Ginseng Figure 1 , Figure 2 As shown, the present invention discloses a telephoto lens, which includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40 and a fifth lens 50 from the object side to the image side, and the object side surface and the image side surface of the first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50 are all aspherical surfaces, wherein:

[0039] The first lens 10 has positive refractive power, and its object side optical axis is convex, and its image side optical axis is convex;

[0040] The second lens 20 has negative refractive power, and its object side optical axis is convex, and its image side optical axis is concave;

[0041] The third lens 30 has negative refractive power, and its object side optical axis is concave, and its image side optical axis is concave;

[0042] The fourth lens element 40 has negative refractive power, and its object side surface is concave at the optical axis, its image side surface is concave at the optical axis, and the image side surface has at least one convex surface off-axis;

[0043] The fifth lens 50 has a positive optical power. Its object side surface is convex at the optical axis and has at least one concave surface at an off-axis position on the object side surface. Its image side surface is convex at the optical axis.

[0044] Furthermore, the telephoto lens further includes:

[0045] A filter 60, located on the image side of the fifth lens 50;

[0046] A lens barrel 70, used to encapsulate the first lens, the second lens, the third lens, the fourth lens, and the fifth lens;

[0047] A plurality of spacer rings 80, encapsulated between the first lens and the second lens, and / or between the second lens and the third lens, and / or between the third lens and the fourth lens, and / or between the fourth lens and the fifth lens.

[0048] In the telephoto lens of the present invention, the interval distance TTL of the imaging surface on the optical axis and the total effective focal length f of the telephoto lens satisfy 0.8 < TTL / f < 0.9, which can control the miniaturization and effectively control the viewing angle range while ensuring long focal length, so as to meet the multi-functional photography requirements.

[0049] In addition, the total effective focal length f of the telephoto lens and the curvature radius R1 of the object side surface of the first lens and the curvature radius R8 of the image side surface of the fourth lens satisfy 4.0 < f / R1 < 4.6 and 0.3 < f / R8 < 1.4. By the ratio of the focal length to the curvature radius R1, it is ensured that the imaging quality of the local image has a high resolution when the focal length is long. In addition, by controlling the ratio of the focal length to the curvature radius R8, the curvature of the fourth lens toward the side is controlled, and at the same time, stray light is prevented from entering the imaging surface, so as to improve the imaging quality of the optical system in the case of long focal length.

[0050] Preferably, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy -2.5 < f4 / f1 < -1.5, which helps to reduce the sensitivity of the optical imaging lens group;

[0051] Preferably, the effective focal length f5 of the fifth lens and the total effective focal length f of the telephoto lens satisfy 0.6 < f5 / f < 1.3, which can avoid excessive light deflection, adjust the light focusing position at the same time, improve the light converging ability of the system, and shorten the total length of the lens without affecting the long focal length.

[0052] Preferably, the distance TTL of the imaging surface of the telephoto lens on the optical axis is 6.380 mm, and the total effective focal length f of the telephoto lens is 7.08 mm to 7.98 mm; the central thicknesses CT1, CT2, CT3, CT4, CT5 of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens on the optical axis and the sum of the central thicknesses ∑CT satisfy 1.15 mm ≤ CT1 ≤ 1.205 mm, 0.20 mm ≤ CT2 ≤ 0.24 mm, 0.22 mm ≤ CT3 ≤ 0.24 mm, 0.27 mm ≤ CT4 ≤ 0.35 mm, 0.63 mm ≤ CT5 ≤ 0.67 mm, 2.50 mm ≤ ∑CT ≤ 2.66 mm.

[0053] Preferably, the air gap T23 between the second lens and the third lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, the air gap T45 between the fourth lens and the fifth lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy 4 < (T23 + T34 + T45) / (CT3 + CT4) < 5.5. By reasonably distributing the air gaps between the lenses and their central thicknesses on the optical axis, the lens processing and assembly difficulties can be reduced. At the same time, sufficient spacing space can be ensured between the lenses to improve the ability of the optical imaging lens to correct astigmatism and field curvature; CT3 / T34 < 0.2, which helps to make the lens size distribution uniform, ensure assembly stability, and is beneficial to reducing the aberration of the entire imaging system and shortening the total length of the imaging system.

[0054] Preferably, the combined focal length f12 of the first lens and the second lens and the central thickness CT1 of the first lens on the optical axis satisfy 3.5 < f12 / CT1 < 4.5, which can effectively reduce the chromatic aberration of the optical imaging lens and avoid excessive spherical aberration and coma of the system.

[0055] Preferably, the sum ∑T of the spacing distances between any two adjacent lenses among the first lens to the fifth lens on the optical axis, the air gap T45 between the fourth lens and the fifth lens on the optical axis, and the spacing distance T12 between the first lens and the second lens on the optical axis satisfy 9 < ∑T / (T45 + T12) < 14.5, which can ensure the processing, forming, and assembly characteristics of each lens and is beneficial to mass production.

[0056] Preferably, the central thickness CT5 of the fifth lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, and half of the maximum field of view HFOV of the telephoto lens satisfy -2.6 < CT5 / CT3 × TAN(HFOV) < -2.2, which is beneficial to reasonably distribute the on-axis space of the imaging lens to achieve lens miniaturization.

[0057] Preferably, the curvature radius R1 of the object side surface of the first lens, the curvature radius R8 of the image side surface of the fourth lens, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy R1 / R8<0.3, 0.68<(R3-R4) / (R3+R4)<1. Reasonable control of the curvature radius of the object side surface of the first lens and the curvature radius of the image side surface of the fourth lens can effectively reduce the difficulty of processing, and at the same time improve the chromatic aberration balance ability and distortion balance ability of the optical imaging lens; reasonable control of the curvature radii of the object side surface and the image side surface of the second lens can effectively avoid the second lens from being excessively bent, reduce the difficulty of processing, and at the same time reduce the astigmatism and coma between the second lens and the front lens, thereby improving the imaging quality of the system.

[0058] Preferably, the maximum effective semi-aperture DT11 of the object side of the first lens, the maximum effective semi-aperture DT12 of the image side of the first lens, the maximum effective semi-aperture DT21 of the object side of the second lens, the maximum effective semi-aperture DT22 of the image side of the second lens and the imaging plane of the telephoto lens on the optical axis satisfy TTL of 1.2<(DT11+DT22) / 2<1.4, and reasonable control of the maximum effective semi-aperture of the object side of the first lens and the maximum effective semi-aperture of the image side of the second lens is conducive to miniaturization of the system; 0.8<(DT11+DT12+DT21+DT22) / TTL<0.9, which is conducive to reducing the size of the system, reducing the difficulty and cost of processing, and at the same time, the off-axis aberration can be effectively improved by controlling the maximum effective semi-aperture of the lens.

[0059] The invention also discloses an electronic device, in which at least one telephoto lens is provided.

[0060] The present invention is further described below in conjunction with specific embodiments.

[0061] Embodiment 1:

[0062] In this embodiment, the total effective focal length of the telephoto lens is f=7.544 mm. The first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50 are all resin lenses, the center is a lens, and the edges are corroded and matte treated. The parameters of the material, refractive index, effective focal length, etc. are as follows:

[0063] The first lens 10 is made of APEL5514, has a refractive index of 1.544, an effective focal length f1=2.931 mm, an effective aperture on the object side of 3.05 mm, and an effective aperture on the image side of 2.79 mm;

[0064] The second lens 20 is made of EP9000, has a refractive index of 1.67, an effective focal length f2=-5.891mm, an effective aperture on the object side is 2.54mm, and an effective aperture on the image side is 2.20mm;

[0065] The third lens 30 is made of K26R, has a refractive index of 1.53, an effective focal length f3=-5.684mm, an effective aperture of the object side surface of 1.92mm, and an effective aperture of the image side surface of 2.03mm;

[0066] The fourth lens 40 is made of AD-5503, has a refractive index of 1.585, an effective focal length f4=-6.903 mm, an effective aperture on the object side is 3.14 mm, and an effective aperture on the image side is 3.41 mm;

[0067] The fifth lens 50 is made of EP8000, has a refractive index of 1.661, an effective focal length f5=8.261 mm, an effective aperture on the object side is 3.59 mm, and an effective aperture on the image side is 3.86 mm.

[0068] In addition, the center thicknesses CT1, CT2, CT3, CT4, CT5 and the sum of the center thicknesses ∑CT of the first lens, the second lens, the third lens, the fourth lens and the fifth lens on the optical axis are respectively: CT1 = 1.162 mm, CT2 = 0.200 mm, CT3 = 0.230 mm, CT4 = 0.270 mm, CT5 = 0.696 mm, ∑CT = 2.558 mm;

[0069] The distance between the imaging planes of the telephoto lens on the optical axis is TTL = 6.380 mm;

[0070] The radius of curvature of the object side of the first lens is R1 = 1.795 mm, and the radius of curvature of the image side of the first lens is R2 = -11.315 mm;

[0071] The curvature radius of the object side of the second lens is R3 = 25.893 mm, and the curvature radius of the image side of the second lens is R4 = 3.442 mm;

[0072] The curvature radius of the object side of the third lens is R5 = -8.108 mm, and the curvature radius of the image side of the third lens is R6 = 4.929 mm;

[0073] The curvature radius of the object side surface of the fourth lens is R7=-9.069 mm, and the curvature radius of the image side surface of the fourth lens is R8=7.440 mm;

[0074] The curvature radius of the object side surface of the fifth lens is R9=13.128mm, and the curvature radius of the image side surface of the fifth lens is R10=-9.289mm;

[0075] The distance between the first lens and the second lens on the optical axis is T12=0.098 mm, the air distance between the second lens and the third lens on the optical axis is T23=0.965 mm, the air distance between the third lens and the fourth lens on the optical axis is T34=1.619 mm, the air distance between the fourth lens and the fifth lens on the optical axis is T45=0.100 mm, and the sum of the distances between any two adjacent lenses from the first lens to the fifth lens on the optical axis is ∑T=2.782 mm;

[0076] The combined focal length of the first lens and the second lens is f12 = 4.466 mm;

[0077] Half of the maximum field of view of the telephoto lens HFOV = 15.000°;

[0078] The maximum effective half-aperture DT11 of the object side surface of the first lens is 1.525 mm, the maximum effective half-aperture DT12 of the image side surface of the first lens is 1.397 mm, the maximum effective half-aperture DT21 of the object side surface of the second lens is 1.270 mm, and the maximum effective half-aperture DT22 of the image side surface of the second lens is 1.101 mm.

[0079] In this embodiment, the telephoto lens satisfies:

[0080] TTL / f=0.846;

[0081] f / R1=4.203;

[0082] f / R8=1.014;

[0083] f4 / f1=-2.355;

[0084] f5 / f=1.095;

[0085] (T23+T34+T45) / (CT3+CT4)=5.368;

[0086] CT3 / T34=0.142;

[0087] f12 / ct1=3.845;

[0088] ∑T / (T45+T12)=14.031;

[0089] CT5 / CT3×TAN(HFOV)=-2.591;

[0090] R1 / R8=0.241;

[0091] (R3-R4) / (R3+R4)=0.765;

[0092] (DT11+DT22) / 2=1.313;

[0093] (DT11+DT12+DT21+DT22) / TTL=0.830.

[0094] The surface of each lens is aspherical and satisfies the aspherical formula:

[0095]

[0096] Among them, Z is the aspheric curve, C=1 / r (r is the paraxial spherical radius), Y is the radius of curvature, K is the cone constant (quadratic surface constant), and a, b, c, d, e... are high-order coefficients (4th order, 6th order, 8th order, 10th order, 12th order...).

[0097] The object side surface and image side surface of the first lens 10 are S1 and S2 respectively, the object side surface and image side surface of the second lens 20 are S3 and S4 respectively, the object side surface and image side surface of the third lens 30 are S5 and S6 respectively, the object side surface and image side surface of the fourth lens 40 are S7 and S8 respectively, the object side surface and image side surface of the fifth lens 50 are S9 and S10 respectively, and S1-SAG to S10-SAG are the sag heights of each surface (at 0.2mm, 0.4mm, 0.6mm, and 1.0mm). The specific surface parameters are shown in Tables 1 and 2.

[0098] Table 1: Lens surface parameters Table 1

[0099]

[0100]

[0101] Table 2: Lens surface parameters Table 2

[0102]

[0103]

[0104] In this embodiment, the total optical length of the lens is 6.38 mm.

[0105] Ginseng Figure 3 1 is a graph of image height (Real Image Height)-resolution (MTF) in this embodiment, from top to bottom, they are respectively the resolution curves of the meridian direction (S) and arc loss direction (T) when the spatial frequency is 0lp / mm, the meridian direction (S) and arc loss direction (T) when the spatial frequency is 33lp / mm, the meridian direction (S) and arc loss direction (T) when the spatial frequency is 66lp / mm, and the meridian direction (S) and arc loss direction (T) when the spatial frequency is 132lp / mm. It can be seen that the telephoto lens in this embodiment has good resolution at high frequencies and the overall trend is smooth.

[0106] Ginseng Figure 4 The distortion curve diagram in this embodiment is shown in FIG. 1 , and it can be seen that the distortion of the telephoto lens in this embodiment is relatively small, less than 1.0%. Figure 5 The graph shown is a curve of relative field height (Relative Field Height)-relative illumination (Relative Illumination) in this embodiment. It can be seen that the relative illumination of the telephoto lens in this embodiment is greater than 77.5%.

[0107] Embodiment 2:

[0108] In this embodiment, the total effective focal length of the telephoto lens is f=7.463 mm. The first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50 are all resin lenses, the center is a lens, and the edges are corroded and matte treated. The parameters of the material, refractive index, effective focal length, etc. are as follows:

[0109] The first lens 10 is made of APEL5514, has a refractive index of 1.544, an effective focal length f1=2.942 mm, an effective aperture on the object side of 1.525 mm, and an effective aperture on the image side of 1.378 mm;

[0110] The second lens 20 is made of EP9000, has a refractive index of 1.67, an effective focal length f2=-5.077mm, an effective aperture on the object side is 1.193mm, and an effective aperture on the image side is 1.011mm;

[0111] The third lens 30 is made of K26R, has a refractive index of 1.53, an effective focal length f3=-5.936mm, an effective aperture on the object side of 0.91mm, and an effective aperture on the image side of 1.021mm;

[0112] The fourth lens 40 is made of AD-5503, has a refractive index of 1.585, an effective focal length f4=-5.029 mm, an effective aperture on the object side is 1.512 mm, and an effective aperture on the image side is 1.657 mm;

[0113] The fifth lens 50 is made of EP8000, has a refractive index of 1.661, an effective focal length of f5=5.041 mm, an effective aperture on the object side is 1.68 mm, and an effective aperture on the image side is 1.84 mm.

[0114] In addition, the center thicknesses CT1, CT2, CT3, CT4, CT5 and the sum of the center thicknesses ∑CT of the first lens, the second lens, the third lens, the fourth lens and the fifth lens on the optical axis are: CT1 = 1.204 mm, CT2 = 0.210 mm, CT3 = 0.230 mm, CT4 = 0.343 mm, CT5 = 0.676 mm, ∑CT = 2.662 mm;

[0115] The distance between the imaging planes of the telephoto lens on the optical axis is TTL = 6.380 mm;

[0116] The curvature radius of the object side of the first lens is R1 = 1.709 mm, and the curvature radius of the image side of the first lens is R2 = -20 mm;

[0117] The curvature radius of the object side of the second lens is R3 = 23.926 mm, and the curvature radius of the image side of the second lens is R4 = 2.991 mm;

[0118] The curvature radius of the object side of the third lens is R5 = -8.577 mm, and the curvature radius of the image side of the third lens is R6 = 5.106 mm;

[0119] The curvature radius of the object side surface of the fourth lens is R7=-3.759 mm, and the curvature radius of the image side surface of the fourth lens is R8=14.395 mm;

[0120] The curvature radius of the object side surface of the fifth lens is R9=4.978mm, and the curvature radius of the image side surface of the fifth lens is R10=-9.789mm;

[0121] The distance between the first lens and the second lens on the optical axis is T12=0.164mm, the air distance between the second lens and the third lens on the optical axis is T23=1.019mm, the air distance between the third lens and the fourth lens on the optical axis is T34=1.300mm, the air distance between the fourth lens and the fifth lens on the optical axis is T45=0.123mm, and the sum of the distances between any two adjacent lenses from the first lens to the fifth lens on the optical axis is ∑T=2.605mm;

[0122] The combined focal length of the first lens and the second lens is f12 = 4.707 mm;

[0123] Half of the maximum field of view of the telephoto lens HFOV = 15.000°;

[0124] The maximum effective half-aperture DT11 of the object side surface of the first lens is 1.525 mm, the maximum effective half-aperture DT12 of the image side surface of the first lens is 1.378 mm, the maximum effective half-aperture DT21 of the object side surface of the second lens is 1.320 mm, and the maximum effective half-aperture DT22 of the image side surface of the second lens is 1.011 mm.

[0125] In this embodiment, the telephoto lens satisfies:

[0126] TTL / f=0.855;

[0127] f / R1=4.366;

[0128] f / R8=0.518;

[0129] f4 / f1=-1.709;

[0130] f5 / f=0.676;

[0131] (T23+T34+T45) / (CT3+CT4)=4.263;

[0132] CT3 / T34=0.177;

[0133] f12 / ct1=3.910;

[0134] ∑T / (T45+T12)=9.105;

[0135] CT5 / CT3×TAN(HFOV)=-2.515;

[0136] R1 / R8=0.119;

[0137] (R3-R4) / (R3+R4)=0.778;

[0138] (DT11+DT22) / 2=1.268;

[0139] (DT11+DT12+DT21+DT22) / TTL=0.820.

[0140] Embodiment three:

[0141] In this embodiment, the total effective focal length of the telephoto lens is f=7.601 mm. The first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50 are all resin lenses, the center is a lens, and the edges are corroded and matte treated. The parameters of the material, refractive index, effective focal length, etc. are as follows:

[0142] The first lens 10 is made of APEL5514, has a refractive index of 1.544, an effective focal length f1=3.014 mm, an effective aperture on the object side of 1.525 mm, and an effective aperture on the image side of 1.413 mm;

[0143] The second lens 20 is made of EP9000, has a refractive index of 1.67, an effective focal length f2=-5.641 mm, an effective aperture on the object side is 1.287 mm, and an effective aperture on the image side is 1.082 mm;

[0144] The third lens 30 is made of K26R, has a refractive index of 1.53, an effective focal length f3=-5.926mm, an effective aperture of the object side surface of 0.900mm, and an effective aperture of the image side surface of 0.992mm;

[0145] The fourth lens 40 is made of AD-5503, has a refractive index of 1.585, an effective focal length f4=-4.708 mm, an effective aperture on the object side is 1.528 mm, and an effective aperture on the image side is 1.669 mm;

[0146] The fifth lens 50 is made of EP8000, has a refractive index of 1.661, an effective focal length of f5=4.091 mm, an effective aperture on the object side is 1.696 mm, and an effective aperture on the image side is 1.833 mm.

[0147] In addition, the center thicknesses CT1, CT2, CT3, CT4, CT5 and the sum of the center thicknesses ∑CT of the first lens, the second lens, the third lens, the fourth lens and the fifth lens on the optical axis are respectively: CT1 = 1.151 mm, CT2 = 0.200 mm, CT3 = 0.230 mm, CT4 = 0.295 mm, CT5 = 0.632 mm, ∑CT = 2.508 mm;

[0148] The distance between the imaging planes of the telephoto lens on the optical axis is TTL = 6.380 mm;

[0149] The curvature radius of the object side of the first lens is R1 = 1.756 mm, and the curvature radius of the image side of the first lens is R2 = -20 mm;

[0150] The curvature radius of the object side of the second lens is R3 = 25.893 mm, and the curvature radius of the image side of the second lens is R4 = 3.442 mm;

[0151] The curvature radius of the object side of the third lens is R5 = -11.176 mm, and the curvature radius of the image side of the third lens is R6 = 4.470 mm;

[0152] The curvature radius of the object side surface of the fourth lens is R7=-3.569 mm, and the curvature radius of the image side surface of the fourth lens is R8=12.767 mm;

[0153] The curvature radius of the object side surface of the fifth lens is R9=3.956mm, and the curvature radius of the image side surface of the fifth lens is R10=-17.603mm;

[0154] The distance between the first lens and the second lens on the optical axis is T12=0.104 mm, the air distance between the second lens and the third lens on the optical axis is T23=1.171 mm, the air distance between the third lens and the fourth lens on the optical axis is T34=1.300 mm, the air distance between the fourth lens and the fifth lens on the optical axis is T45=0.091 mm, and the sum of the distances between any two adjacent lenses from the first lens to the fifth lens on the optical axis is ∑T=2.666 mm;

[0155] The combined focal length of the first lens and the second lens is f12 = 4.754 mm;

[0156] Half of the maximum field of view of the telephoto lens HFOV = 15.000°;

[0157] The maximum effective half-aperture DT11 of the object side surface of the first lens is 1.525 mm, the maximum effective half-aperture DT12 of the image side surface of the first lens is 1.413 mm, the maximum effective half-aperture DT21 of the object side surface of the second lens is 1.287 mm, and the maximum effective half-aperture DT22 of the image side surface of the second lens is 1.115 mm.

[0158] In this embodiment, the telephoto lens satisfies:

[0159] TTL / f=0.839;

[0160] f / R1=4.328;

[0161] f / R8=0.595;

[0162] f4 / f1=-1.562;

[0163] f5 / f=0.645;

[0164] (T23+T34+T45) / (CT3+CT4)=4.878;

[0165] CT3 / T34=0.177;

[0166] f12 / ct1=4.131;

[0167] ∑T / (T45+T12)=13.631;

[0168] CT5 / CT3×TAN(HFOV)=-2.353;

[0169] R1 / R8=0.138;

[0170] (R3-R4) / (R3+R4)=0.683;

[0171] (DT11+DT22) / 2=1.320;

[0172] (DT11+DT12+DT21+DT22) / TTL=0.837.

[0173] Embodiment 4:

[0174] In this embodiment, the telephoto lens has a total effective focal length f=7.637 mm, and includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, and a fifth lens 50, all of which are resin lenses, with the center being a lens and the edges being subjected to corrosion and matte treatment. The parameters of the material, refractive index, effective focal length, etc. are as follows:

[0175] The first lens 10 is made of APEL5514, has a refractive index of 1.544, an effective focal length f1=2.938 mm, an effective aperture on the object side is 1.525 mm, and an effective aperture on the image side is 1.392 mm;

[0176] The second lens 20 is made of EP9000, has a refractive index of 1.67, an effective focal length f2=-5.789mm, an effective aperture on the object side is 1.284mm, and an effective aperture on the image side is 1.097mm;

[0177] The third lens 30 is made of K26R, has a refractive index of 1.53, an effective focal length f3=-5.594mm, an effective aperture on the object side of 0.96mm, and an effective aperture on the image side of 1.017mm;

[0178] The fourth lens 40 is made of AD-5503, has a refractive index of 1.585, an effective focal length f4=-6.430 mm, an effective aperture on the object side is 1.569 mm, and an effective aperture on the image side is 1.747 mm;

[0179] The fifth lens 50 is made of EP8000, has a refractive index of 1.661, an effective focal length of f5=7.179 mm, an effective aperture on the object side is 1.831 mm, and an effective aperture on the image side is 1.946 mm.

[0180] In addition, the center thicknesses CT1, CT2, CT3, CT4, CT5 and the sum of the center thicknesses ∑CT of the first lens, the second lens, the third lens, the fourth lens and the fifth lens on the optical axis are: CT1 = 1.191 mm, CT2 = 0.238 mm, CT3 = 0.230 mm, CT4 = 0.270 mm, CT5 = 0.658 mm, ∑CT = 2.586 mm;

[0181] The distance between the imaging planes of the telephoto lens on the optical axis is TTL = 6.380 mm;

[0182] The radius of curvature of the object side of the first lens is R1 = 1.811 mm, and the radius of curvature of the image side of the first lens is R2 = -10.708 mm;

[0183] The curvature radius of the object side of the second lens is R3 = 25.893 mm, and the curvature radius of the image side of the second lens is R4 = 3.442 mm;

[0184] The curvature radius of the object side of the third lens is R5 = -7.991 mm, and the curvature radius of the image side of the third lens is R6 = 4.785 mm;

[0185] The curvature radius of the object side surface of the fourth lens is R7=-8.037mm, and the curvature radius of the image side surface of the fourth lens is R8=7.240mm;

[0186] The curvature radius of the object side surface of the fifth lens is R9=9.259 mm, and the curvature radius of the image side surface of the fifth lens is R10=-9.628 mm;

[0187] The distance between the first lens and the second lens on the optical axis is T12=0.100 mm, the air distance between the second lens and the third lens on the optical axis is T23=0.936 mm, the air distance between the third lens and the fourth lens on the optical axis is T34=1.617 mm, the air distance between the fourth lens and the fifth lens on the optical axis is T45=0.100 mm, and the sum of the distances between any two adjacent lenses from the first lens to the fifth lens on the optical axis is ∑T=2.754 mm;

[0188] The combined focal length of the first lens and the second lens is f12 = 4.500 mm;

[0189] Half of the maximum field of view of the telephoto lens HFOV = 15.000°;

[0190] The maximum effective half-aperture DT11 of the object side surface of the first lens is 1.525 mm, the maximum effective half-aperture DT12 of the image side surface of the first lens is 1.392 mm, the maximum effective half-aperture DT21 of the object side surface of the second lens is 1.284 mm, and the maximum effective half-aperture DT22 of the image side surface of the second lens is 1.097 mm.

[0191] In this embodiment, the telephoto lens satisfies:

[0192] TTL / f=0.835;

[0193] f / R1=4.217;

[0194] f / R8=1.055;

[0195] f4 / f1=-2.189;

[0196] f5 / f=0.940;

[0197] (T23+T34+T45) / (CT3+CT4)=5.307;

[0198] CT3 / T34=0.142;

[0199] f12 / ct1=3.780;

[0200] ∑T / (T45+T12)=13.768;

[0201] CT5 / CT3×TAN(HFOV)=-2.450;

[0202] R1 / R8=0.250;

[0203] (R3-R4) / (R3+R4)=0.938;

[0204] (DT11+DT22) / 2=1.311;

[0205] (DT11+DT12+DT21+DT22) / TTL=0.830.

[0206] It can be seen from the above technical solutions that the present invention has the following beneficial effects:

[0207] The telephoto lens and the electronic device of the present invention can improve the resolution of the lens, reduce optical distortion, and ensure relative illumination while ensuring the telephoto by controlling parameters such as the center thickness of each lens and the air interval.

[0208] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0209] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A telephoto lens, characterized in that: The telephoto lens is composed of a first lens, a second lens, a third lens, a fourth lens, and a fifth lens from the object side to the image side. The object side and the image side of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all aspherical surfaces, where: The first lens has a positive optical power. Its object side surface is convex at the optical axis, and its image side surface is convex at the optical axis. The second lens has a negative optical power. Its object side surface is convex at the optical axis, and its image side surface is concave at the optical axis. The third lens has a negative optical power. Its object side surface is concave at the optical axis, and its image side surface is concave at the optical axis. The fourth lens has a negative optical power. Its object side surface is concave at the optical axis, and its image side surface is concave at the optical axis. There is at least one convex surface at the off-axis position of the image side. The fifth lens has a positive optical power. Its object side surface is convex at the optical axis. There is at least one concave surface at the off-axis position of the object side, and its image side surface is convex at the optical axis. The interval distance TTL of the imaging surface of the telephoto lens on the optical axis and the total effective focal length f of the telephoto lens satisfy 0.8 < TTL / f < 0.

9. The total effective focal length f of the telephoto lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R8 of the image side surface of the fourth lens satisfy 4.0 < f / R1 < 4.6 and 0.3 < f / R8 < 1.

4. The total effective focal length f of the telephoto lens is 7.08 mm to 7.98 mm. The central thicknesses CT1, CT2, CT3, CT4, CT5 of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens on the optical axis respectively, and the sum of the central thicknesses ∑CT satisfy 1.15 mm ≤ CT1 ≤ 1.205 mm, 0.20 mm ≤ CT2 ≤ 0.24 mm, 0.22 mm ≤ CT3 ≤ 0.24 mm, 0.27 mm ≤ CT4 ≤ 0.35 mm, 0.63 mm ≤ CT5 ≤ 0.67 mm, 2.50 mm ≤ ∑CT ≤ 2.66 mm. The effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens satisfy -2.5 < f4 / f1 < -1.

5. The effective focal length f5 of the fifth lens and the total effective focal length f of the telephoto lens satisfy 0.6 < f5 / f < 1.

3.

2. The telephoto lens according to claim 1, characterized in that: The interval distance TTL of the imaging surface of the telephoto lens on the optical axis is 6.380 mm.

3. The telephoto lens according to claim 2, characterized in that: The air interval T23 between the second lens and the third lens on the optical axis, the air interval T34 between the third lens and the fourth lens on the optical axis, the air interval T45 between the fourth lens and the fifth lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy 4 < (T23 + T34 + T45) / (CT3 + CT4) < 5.5 and CT3 / T34 < 0.

2. The combined focal length f12 of the first lens and the second lens and the central thickness CT1 of the first lens on the optical axis satisfy 3.5 < f12 / CT1 < 4.

5.

4. The telephoto lens according to claim 1, wherein: The sum ∑T of the spacing distances between any two adjacent lenses among the first to fifth lenses on the optical axis, the air spacing T45 between the fourth lens and the fifth lens on the optical axis, and the spacing distance T12 between the first lens and the second lens on the optical axis satisfy 9<∑T / (T45+T12)<14.

5.

5. The telephoto lens according to claim 1, characterized in that: The center thickness CT5 of the fifth lens on the optical axis, the center thickness CT3 of the third lens on the optical axis and half of the maximum field of view HFOV of the telephoto lens satisfy -2.6 <CT5 / CT3×TAN(HFOV)<-2.2。 6. The telephoto lens according to claim 1, wherein: The curvature radius R1 of the object side surface of the first lens, the curvature radius R8 of the image side surface of the fourth lens, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy R1 / R8<0.3, 0.68<(R3-R4) / (R3+R4)<1.

7. The telephoto lens according to claim 1, wherein: The maximum effective semi-aperture DT11 of the object side surface of the first lens, the maximum effective semi-aperture DT12 of the image side surface of the first lens, the maximum effective semi-aperture DT21 of the object side surface of the second lens, the maximum effective semi-aperture DT22 of the image side surface of the second lens and the imaging plane of the telephoto lens on the optical axis are spaced apart by a distance TTL that satisfies 1.2<(DT11+DT22) / 2<1.4, 0.8<(DT11+DT12+DT21+DT22) / TTL<0.

9.

8. The telephoto lens according to claim 1, wherein: The telephoto lens also includes: A filter, located on the image side of the fifth lens; A lens barrel, used for encapsulating the first lens, the second lens, the third lens, the fourth lens and the fifth lens; A plurality of spacer rings are packaged between the first lens and the second lens, and / or the second lens and the third lens, and / or the third lens and the fourth lens, and / or the fourth lens and the fifth lens.

9. An electronic device, characterized in that: The electronic device is provided with at least one telephoto lens according to any one of claims 1 to 8.

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