Telephoto lens and electronic device

Abstract

The application discloses a telephoto lens and electronic equipment, which is composed of first to sixth lenses from the object side to the image side; wherein the first, second and fifth lenses have positive refractive power, and the fourth and sixth lenses have negative refractive power; in addition, the object side and the image side of the first lens are convex and concave respectively, the object side and the image side of the second lens are both convex, the object side and the image side of the third and fourth lenses are both concave, and the object side and the image side of the fifth and sixth lenses are concave and convex respectively. In the telephoto lens, the focal length f of the telephoto lens, the focal length f1 of the first lens, the total focal length f13 of the optical system formed by the first to third lenses, and the maximum field angle FOV of the telephoto lens satisfy the following conditions: 0.3 < f1 / f < 1.2; 0.9 < f1 / f13 < 1.5; FOV < 40. The application reasonably restricts the focal length and the field angle of the lens, so that the lens is light, thin, small, can correct aberration well, has high pixels, high resolution and excellent imaging quality, and can meet the application requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging technology, and in particular to a telephoto lens and electronic device. BACKGROUND

[0002] In order to meet the market demand for small size of electronic devices, the volume of the lens mounted in the electronic device tends to be small, which requires further shortening the overall length of the lens. However, in this way, the telephoto characteristics of the lens may be reduced, which leads to the difficulty of the telephoto lens to meet the demand for photographing at a distance. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application provides a telephoto lens and electronic device, which solves the problem that shortening the length of the lens in the prior art leads to the difficulty of the telephoto lens to meet the demand for photographing at a distance.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0005] A telephoto lens, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in order from the object side to the image side, wherein each surface from the object side surface of the first lens to the image side surface of the sixth lens is aspherical.

[0006] The first lens has positive refractive power, and the object side surface thereof is convex near the optical axis, and the image side surface thereof is concave near the optical axis.

[0007] The second lens has positive refractive power, and the object side surface thereof is convex near the optical axis, and the image side surface thereof is convex near the optical axis.

[0008] The third lens has refractive power, and the object side surface thereof is concave near the optical axis, and the image side surface thereof is concave near the optical axis.

[0009] The fourth lens has negative refractive power, and the object side surface thereof is concave near the optical axis, and the image side surface thereof is concave near the optical axis.

[0010] The fifth lens has positive refractive power, and the object side surface thereof is concave near the optical axis, and the image side surface thereof is convex near the optical axis.

[0011] The sixth lens has negative refractive power, and the object side surface thereof is concave near the optical axis, and the image side surface thereof is convex near the optical axis.

[0012] The telephoto lens satisfies the following conditional expressions:

[0013] 0.3 < f1 / f < 1.2;

[0014] 0.9 < f1 / f13 < 1.5;

[0015] FOV < 40;

[0016] Where f is the focal length of the telephoto lens, f1 is the focal length of the first lens, f13 is the overall focal length of the optical system formed by the first lens to the third lens, and FOV is the maximum field of view of the telephoto lens.

[0017] Optionally, the telephoto lens satisfies the following condition:

[0018] 0.15 <SAG41+CT4<0.7;

[0019] Wherein, SAG41 is the horizontal displacement distance from the intersection of the object side surface of the fourth lens on the optical axis to the position of the maximum effective radius of the object side surface of the fourth lens on the optical axis, and CT4 is the thickness of the fourth lens on the optical axis.

[0020] Optionally, the telephoto lens satisfies the following condition:

[0021] 0.2 <R1 / f1<0.65;

[0022] Where R1 is the radius of curvature of the object side surface of the first lens, and f1 is the focal length of the first lens.

[0023] Optionally, the telephoto lens satisfies the following condition:

[0024] 0.7 <EPD / DM51<1.3;

[0025] Wherein, EPD is the entrance pupil diameter of the telephoto lens, and DM51 is the maximum effective diameter of the object side surface of the fifth lens.

[0026] Optionally, the telephoto lens satisfies the following condition:

[0027] -1 < (R3 + R4) / (R3 - R4) < -0.15;

[0028] Wherein, R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

[0029] Optionally, the telephoto lens satisfies the following condition:

[0030] 5 < (T12 + T45) / CT3 < 11;

[0031] Wherein, T12 is the air gap between the first lens and the second lens on the optical axis, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, and CT3 is the thickness of the third lens on the optical axis.

[0032] Optionally, the telephoto lens satisfies the following condition:

[0033] 0.6 <f1 / f2<1.5;

[0034] Where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

[0035] Optionally, the object side of the first lens is further provided with an aperture stop.

[0036] The present invention also provides an electronic device, including a telephoto lens as described in any of the preceding claims and an imaging element for converting an optical pattern formed by the telephoto lens into an electrical signal.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] This invention provides a telephoto lens and electronic device. By rationally constraining the focal length and field of view of the lens, the overall length of the lens is shortened while ensuring its telephoto characteristics and high image quality. The telephoto lens provided by this invention is lightweight, thin, and compact, effectively corrects aberrations, and features high pixel count, high resolution, and excellent image quality, meeting application requirements. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0040] Figure 1 A schematic diagram of a telephoto lens according to Embodiment 1 of the present invention is shown;

[0041] Figure 2 From left to right, the graphs show the astigmatism and distortion curves of a telephoto lens according to Embodiment 1 of the present invention;

[0042] Figure 3 This is a spherical aberration curve of a telephoto lens according to Embodiment 1 of the present invention;

[0043] Figure 4 A schematic diagram of a telephoto lens according to Embodiment 2 of the present invention is shown;

[0044] Figure 5 From left to right, the images show the astigmatism and distortion curves of a telephoto lens according to Embodiment 2 of the present invention;

[0045] Figure 6 This is a spherical aberration curve of a telephoto lens according to Embodiment 2 of the present invention;

[0046] Figure 7 A schematic diagram of a telephoto lens according to Embodiment 3 of the present invention is shown;

[0047] Figure 8 From left to right, the images show the astigmatism and distortion curves of a telephoto lens according to Embodiment 3 of the present invention;

[0048] Figure 9 This is a spherical aberration curve of a telephoto lens according to Embodiment 3 of the present invention;

[0049] Figure 10 A schematic diagram of a telephoto lens according to Embodiment 4 of the present invention is shown;

[0050] Figure 11 From left to right, the images show the astigmatism and distortion curves of a telephoto lens according to Embodiment 4 of the present invention;

[0051] Figure 12 This is a spherical aberration curve diagram of a telephoto lens according to Embodiment 4 of the present invention;

[0052] Figure 13 A schematic diagram of a telephoto lens according to Embodiment 5 of the present invention is shown;

[0053] Figure 14 From left to right, the images show the astigmatism and distortion curves of a telephoto lens according to Embodiment 5 of the present invention;

[0054] Figure 15 This is a spherical aberration curve of a telephoto lens according to Embodiment 5 of the present invention;

[0055] Figure 16 A schematic diagram of a telephoto lens according to Embodiment Six of the present invention is shown;

[0056] Figure 17 From left to right, the images show the astigmatism and distortion curves of a telephoto lens according to Embodiment Six of the present invention;

[0057] Figure 18 This is a spherical aberration curve of a telephoto lens according to Embodiment Six of the present invention.

[0058] In the above diagram: E1, first lens; E2, second lens; E3, third lens; E4, fourth lens; E5, fifth lens; E6, sixth lens; E7, infrared filter; STO, aperture stop; S1, object-side surface of the first lens; S2, image-side surface of the first lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; S11, object-side surface of the sixth lens; S12, image-side surface of the sixth lens; S13, imaging plane. Detailed Implementation

[0059] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0060] In the description of this invention, it should be understood that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present simultaneously. When a component is considered to be "set" on another component, it can be directly set on the other component or there may be an intermediate component present simultaneously.

[0061] Furthermore, terms such as “long,” “short,” “inner,” and “outer” indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the purpose of describing the present invention and are not intended to indicate or imply that the device or component referred to must have this specific orientation or operate in a specific orientational configuration. Therefore, they should not be construed as limitations of the present invention.

[0062] This invention provides a telephoto lens comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, arranged sequentially from the object side to the image side. All surfaces from the object side of the first lens to the image side of the sixth lens are aspherical. Furthermore, an aperture stop is provided on the object side of the first lens.

[0063] The first lens has positive refractive power, with its object-side surface convex near the optical axis and its image-side surface concave near the optical axis; the second lens has positive refractive power, with its object-side surface convex near the optical axis and its image-side surface convex near the optical axis; the third lens has refractive power, with its object-side surface concave near the optical axis and its image-side surface concave near the optical axis; the fourth lens has negative refractive power, with its object-side surface concave near the optical axis and its image-side surface concave near the optical axis; the fifth lens has positive refractive power, with its object-side surface concave near the optical axis and its image-side surface convex near the optical axis; and the sixth lens has negative refractive power, with its object-side surface concave near the optical axis and its image-side surface convex near the optical axis.

[0064] In the present invention, the telephoto lens satisfies the following conditional expressions: 0.3 < f1 / f < 1.2; 0.9 < f1 / f13 < 1.5; FOV < 40; where f is the focal length of the telephoto lens, f1 is the focal length of the first lens, f13 is the overall focal length of the optical system formed by the first lens to the third lens, and FOV is the maximum field angle of the telephoto lens. By satisfying the foregoing relational expressions, it is possible to reasonably control the configuration of the bending power of the first lens to the third lens in combination with the configuration of the maximum market angle, and it is possible to ensure better light transmittance while correcting aberration.

[0065] Further, the telephoto lens satisfies the following conditional expression: 0.15 < SAG41 + CT4 < 0.7; where SAG41 is the horizontal displacement distance on the optical axis from the intersection point of the object side surface of the fourth lens on the optical axis to the position of the maximum effective radius of the object side surface of the fourth lens, and CT4 is the thickness of the fourth lens on the optical axis. By the foregoing relational expression, the shape and aperture size of the fourth lens are restricted, so that the fourth lens can provide better imaging effects for the lens under the condition of being more miniaturized.

[0066] Further, the telephoto lens satisfies the following conditional expression: 0.2 < R1 / f1 < 0.65; where R1 is the radius of curvature of the object side surface of the first lens, and f1 is the focal length of the first lens. By reasonably adjusting the ratio of the surface shape of the image side of the first lens to its focal length, the telephoto lens can have better aberration correction effects.

[0067] Further, the telephoto lens satisfies the following conditional expression: 0.7 < EPD / DM51 < 1.3; where EPD is the entrance pupil diameter of the telephoto lens, and DM51 is the maximum effective diameter of the object side surface of the fifth lens. Restricting the relationship between the entrance pupil diameter of the telephoto lens and the effective diameter of the image side of the fifth lens can shorten the total length of the lens group on the premise of providing good imaging quality, thereby achieving miniaturization of the lens head.

[0068] Further, the telephoto lens satisfies the following conditional expression: -1 < (R3 + R4) / (R3 - R4) < -0.15; where R3 is the radius of curvature of the object side surface of the second lens, and R4 is the radius of curvature of the image side surface of the second lens. By specifying the shapes of the third and fourth lenses, within the range specified by the conditional expression, the degree of light deflection can be weakened, and thus the purpose of reducing aberration can be achieved.

[0069] Further, the telephoto lens satisfies the following conditional expression: 5 < (T12 + T45) / CT3 < 11; where T12 is the air gap on the optical axis from the first lens to the second lens, T45 is the air gap on the optical axis from the fourth lens to the fifth lens, and CT3 is the thickness of the third lens on the optical axis.

[0070] Further, the telephoto lens satisfies the following conditional formula: 0.6 < f1 / f2 < 1.5; where f1 is the focal length of the first lens and f2 is the focal length of the second lens. By controlling and adjusting the refractive powers of the first and second lenses, the aberration is corrected to ensure the imaging quality. While improving the excellent optical performance, it also has an excellent aberration correction effect.

[0071] Embodiment 1

[0072] Please refer to Figures 1 to 3 , Figure 1 which shows a schematic diagram of a telephoto lens according to Embodiment 1 of the present invention. Figure 2 From left to right are the astigmatism and distortion curves of a telephoto lens according to Embodiment 1 of the present invention in sequence. Figure 3 is the spherical aberration curve of a telephoto lens according to Embodiment 1 of the present invention.

[0073] The present invention provides a telephoto lens, which is composed of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6 in sequence from the object side to the image side. Each surface from the object side surface S1 of the first lens E1 to the image side surface S12 of the sixth lens E6 is an aspherical surface. In addition, an aperture STO is provided on the object side of the first lens E1.

[0074] Among them, the first lens E1 has a positive refractive power. Its object side surface S1 is convex near the optical axis, and its image side surface S2 is concave near the optical axis; the second lens E2 has a positive refractive power. Its object side surface S3 is convex near the optical axis, and its image side surface S4 is convex near the optical axis; the third lens E3 has a refractive power. Its object side surface S5 is concave near the optical axis, and its image side surface S6 is concave near the optical axis; the fourth lens E4 has a negative refractive power. Its object side surface S7 is concave near the optical axis, and its image side surface S8 is concave near the optical axis; the fifth lens E5 has a positive refractive power. Its object side surface S9 is concave near the optical axis, and its image side surface S10 is convex near the optical axis; the sixth lens E6 has a negative refractive power. Its object side surface S11 is concave near the optical axis, and its image side surface S12 is convex near the optical axis.

[0075] In addition, this telephoto lens further includes an infrared filter E7, which is placed between the sixth lens E6 and the imaging surface S13. The infrared filter E7 filters out the infrared band light entering the lens to avoid noise generated by the infrared light irradiating on the photosensitive chip. Specifically, the infrared filter E7 is made of glass material.

[0076] Please refer to Table 1-1, Table 1-2 and Table 1-3 below.

[0077] Table 1-1 shows the detailed structural data for Example 1, where the units for radius of curvature, thickness, and focal length are millimeters, f is the focal length of the telephoto lens, Fno is the aperture value, and EPD is the entrance pupil diameter of the telephoto lens.

[0078] Table 1-2 shows the aspheric coefficient data in Example 1, where k represents the conical coefficient in the aspheric curve equation, and A4, A6, A8, A10, A12, A14 and A16 represent the 4th, 6th, 8th, 10th, 12th, 14th and 16th order aspheric coefficients of each surface.

[0079] Table 1-3 shows the conditions satisfied by the telephoto lens in Example 1.

[0080] In addition, the tables in the following embodiments are schematic diagrams and graphs corresponding to each embodiment. The definitions of the data in the tables are the same as those in Tables 1-1, 1-2 and 1-3 of the first embodiment, and will not be repeated here.

[0081]

[0082]

[0083]

[0084] Example 2

[0085] Please see Figures 4 to 6 , Figure 4 A schematic diagram of a telephoto lens according to Embodiment 2 of the present invention is shown. Figure 5 From left to right, these are astigmatism and distortion curves of a telephoto lens according to Embodiment 2 of the present invention. Figure 6 This is a spherical aberration curve of a telephoto lens according to Embodiment 2 of the present invention.

[0086] Please refer to Table 2-1, Table 2-2, and Table 2-3 below.

[0087]

[0088]

[0089]

[0090] Example 3

[0091] Please see Figures 7 to 9 , Figure 7 A schematic diagram of a telephoto lens according to Embodiment 3 of the present invention is shown. Figure 8 From left to right, these are astigmatism and distortion curves of a telephoto lens according to Embodiment 3 of the present invention. Figure 9 This is a spherical aberration curve of a telephoto lens according to Embodiment 3 of the present invention.

[0092] This invention provides a telephoto lens comprising a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6, arranged sequentially from the object side to the image side. Each surface from the object side S1 of the first lens E1 to the image side S12 of the sixth lens E6 is aspherical. Furthermore, the object side of the first lens E1 is provided with an aperture stop STO.

[0093] Among them, the first lens E1 has positive refractive power, its object-side surface S1 is convex near the optical axis, and its image-side surface S2 is concave near the optical axis; the second lens E2 has positive refractive power, its object-side surface S3 is convex near the optical axis, and its image-side surface S4 is convex near the optical axis; the third lens E3 has refractive power, its object-side surface S5 is concave near the optical axis, and its image-side surface S6 is concave near the optical axis; the fourth lens E4 has negative refractive power, its object-side surface S7 is concave near the optical axis, and its image-side surface S8 is concave near the optical axis; the fifth lens E5 has positive refractive power, its object-side surface S9 is concave near the optical axis, and its image-side surface S10 is convex near the optical axis; the sixth lens E6 has negative refractive power, its object-side surface S11 is concave near the optical axis, and its image-side surface S12 is convex near the optical axis.

[0094] In addition, this telephoto lens also includes an infrared filter E7, which is positioned between the sixth lens E6 and the imaging plane S13. The infrared filter E7 filters out infrared light entering the lens, preventing infrared light from shining onto the image sensor and causing noise. Specifically, the infrared filter E7 is made of glass.

[0095] Please refer to Tables 3-1, 3-2, and 3-3 below.

[0096]

[0097]

[0098]

[0099] Example 4

[0100] Please see Figures 10 to 12 , Figure 10 A schematic diagram of a telephoto lens according to Embodiment 4 of the present invention is shown. Figure 11 From left to right, these are astigmatism and distortion curves of a telephoto lens according to Embodiment 4 of the present invention. Figure 12 This is a spherical aberration curve of a telephoto lens according to Embodiment 4 of the present invention.

[0101] This invention provides a telephoto lens comprising a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6, arranged sequentially from the object side to the image side. Each surface from the object side S1 of the first lens E1 to the image side S12 of the sixth lens E6 is aspherical. Furthermore, the object side of the first lens E1 is provided with an aperture stop STO.

[0102] Among them, the first lens E1 has positive refractive power, its object-side surface S1 is convex near the optical axis, and its image-side surface S2 is concave near the optical axis; the second lens E2 has positive refractive power, its object-side surface S3 is convex near the optical axis, and its image-side surface S4 is convex near the optical axis; the third lens E3 has refractive power, its object-side surface S5 is concave near the optical axis, and its image-side surface S6 is concave near the optical axis; the fourth lens E4 has negative refractive power, its object-side surface S7 is concave near the optical axis, and its image-side surface S8 is concave near the optical axis; the fifth lens E5 has positive refractive power, its object-side surface S9 is concave near the optical axis, and its image-side surface S10 is convex near the optical axis; the sixth lens E6 has negative refractive power, its object-side surface S11 is concave near the optical axis, and its image-side surface S12 is convex near the optical axis.

[0103] In addition, this telephoto lens also includes an infrared filter E7, which is positioned between the sixth lens E6 and the imaging plane S13. The infrared filter E7 filters out infrared light entering the lens, preventing infrared light from shining onto the image sensor and causing noise. Specifically, the infrared filter E7 is made of glass.

[0104] Please refer to Tables 4-1, 4-2, and 4-3 below.

[0105]

[0106]

[0107]

[0108] Example 5

[0109] Please see Figures 13 to 15 , Figure 13 A schematic diagram of a telephoto lens according to Embodiment 5 of the present invention is shown. Figure 14 From left to right, these are astigmatism and distortion curves of a telephoto lens according to Embodiment 5 of the present invention. Figure 15 This is a spherical aberration curve of a telephoto lens according to Embodiment 5 of the present invention.

[0110] This invention provides a telephoto lens comprising a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6, arranged sequentially from the object side to the image side. Each surface from the object side S1 of the first lens E1 to the image side S12 of the sixth lens E6 is aspherical. Furthermore, the object side of the first lens E1 is provided with an aperture stop STO.

[0111] Among them, the first lens E1 has positive refractive power, its object-side surface S1 is convex near the optical axis, and its image-side surface S2 is concave near the optical axis; the second lens E2 has positive refractive power, its object-side surface S3 is convex near the optical axis, and its image-side surface S4 is convex near the optical axis; the third lens E3 has refractive power, its object-side surface S5 is concave near the optical axis, and its image-side surface S6 is concave near the optical axis; the fourth lens E4 has negative refractive power, its object-side surface S7 is concave near the optical axis, and its image-side surface S8 is concave near the optical axis; the fifth lens E5 has positive refractive power, its object-side surface S9 is concave near the optical axis, and its image-side surface S10 is convex near the optical axis; the sixth lens E6 has negative refractive power, its object-side surface S11 is concave near the optical axis, and its image-side surface S12 is convex near the optical axis.

[0112] In addition, this telephoto lens also includes an infrared filter E7, which is positioned between the sixth lens E6 and the imaging plane S13. The infrared filter E7 filters out infrared light entering the lens, preventing infrared light from shining onto the image sensor and causing noise. Specifically, the infrared filter E7 is made of glass.

[0113] Please refer to Tables 5-1, 5-2, and 5-3 below.

[0114]

[0115]

[0116]

[0117] Example 6

[0118] Please see Figures 16 to 18 , Figure 16 A schematic diagram of a telephoto lens according to Embodiment Six of the present invention is shown. Figure 17 From left to right, these are astigmatism and distortion curves of a telephoto lens according to Embodiment Six of the present invention. Figure 18 This is a spherical aberration curve of a telephoto lens according to Embodiment Six of the present invention.

[0119] This invention provides a telephoto lens comprising a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6, arranged sequentially from the object side to the image side. Each surface from the object side S1 of the first lens E1 to the image side S12 of the sixth lens E6 is aspherical. Furthermore, the object side of the first lens E1 is provided with an aperture stop STO.

[0120] Among them, the first lens E1 has positive refractive power, its object-side surface S1 is convex near the optical axis, and its image-side surface S2 is concave near the optical axis; the second lens E2 has positive refractive power, its object-side surface S3 is convex near the optical axis, and its image-side surface S4 is convex near the optical axis; the third lens E3 has refractive power, its object-side surface S5 is concave near the optical axis, and its image-side surface S6 is concave near the optical axis; the fourth lens E4 has negative refractive power, its object-side surface S7 is concave near the optical axis, and its image-side surface S8 is concave near the optical axis; the fifth lens E5 has positive refractive power, its object-side surface S9 is concave near the optical axis, and its image-side surface S10 is convex near the optical axis; the sixth lens E6 has negative refractive power, its object-side surface S11 is concave near the optical axis, and its image-side surface S12 is convex near the optical axis.

[0121] In addition, this telephoto lens also includes an infrared filter E7, which is positioned between the sixth lens E6 and the imaging plane S13. The infrared filter E7 filters out infrared light entering the lens, preventing infrared light from shining onto the image sensor and causing noise. Specifically, the infrared filter E7 is made of glass.

[0122] Please refer to Tables 6-1, 6-2, and 6-3 below.

[0123]

[0124]

[0125]

[0126] Example 7

[0127] Based on the foregoing embodiments, this invention provides an electronic device, including a telephoto lens as described in any of the above embodiments, and an imaging element for converting the optical pattern formed by the telephoto lens into an electrical signal.

[0128] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A telephoto lens, characterized in that, The system consists of six lenses arranged sequentially from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each surface from the object side of the first lens to the image side of the sixth lens is an aspherical surface. The first lens has positive refractive power, its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. The second lens has positive refractive power, and its object-side surface near the optical axis is convex, as is its image-side surface near the optical axis. The third lens has negative refractive power, and its object-side surface near the optical axis is concave, while its image-side surface near the optical axis is also concave. The fourth lens has negative refractive power, and its object-side surface near the optical axis is concave, while its image-side surface near the optical axis is also concave. The fifth lens has positive refractive power, its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. The sixth lens has negative refractive power, its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis. The telephoto lens satisfies the following condition: 0.6209≤f1 / f≤0.7263; 1.161≤f1 / f13≤1.319; FOV≤32.4; Where f is the focal length of the telephoto lens, f1 is the focal length of the first lens, f13 is the overall focal length of the optical system formed by the first lens to the third lens, and FOV is the maximum field of view of the telephoto lens. The telephoto lens satisfies the following condition: 7.183≤(T12+T45) / CT3≤9.70; Wherein, T12 is the air gap between the first lens and the second lens on the optical axis, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, and CT3 is the thickness of the third lens on the optical axis.

2. The telephoto lens according to claim 1, characterized in that, The telephoto lens satisfies the following condition: 0.315≤SAG41+CT4≤0.542; Wherein, SAG41 is the horizontal displacement distance from the intersection of the object side surface of the fourth lens on the optical axis to the position of the maximum effective radius of the object side surface of the fourth lens on the optical axis, and CT4 is the thickness of the fourth lens on the optical axis.

3. The telephoto lens according to claim 1, characterized in that, The telephoto lens satisfies the following condition: 0.389≤R1 / f1≤0.40; Where R1 is the radius of curvature of the object side surface of the first lens, and f1 is the focal length of the first lens.

4. The telephoto lens according to claim 1, characterized in that, The telephoto lens satisfies the following condition: 0.9453≤EPD / DM51≤1.0232; Wherein, EPD is the entrance pupil diameter of the telephoto lens, and DM51 is the maximum effective diameter of the object side surface of the fifth lens.

5. The telephoto lens according to claim 1, characterized in that, The telephoto lens satisfies the following condition: -0.7390≤(R3+R4) / (R3-R4) ≤-0.4430; Wherein, R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

6. The telephoto lens according to claim 1, characterized in that, The telephoto lens satisfies the following condition: 0.902≤f1 / f2≤1.024; Where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

7. The telephoto lens according to claim 1, characterized in that, The object side of the first lens is also provided with an aperture stop.

8. An electronic device, characterized in that, It includes a telephoto lens according to any one of claims 1-7 and an imaging element for converting the optical pattern formed by the telephoto lens into an electrical signal.

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