Ultra-high-definition large-target-surface fisheye lens and electronic equipment

Abstract

The invention discloses an ultra-high-definition large-target-surface fisheye lens. The ultra-high-definition large-target-surface fisheye lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are sequentially arranged in the direction from an object side to an image side along an optical axis. The lens provided by the invention adopts a ten-piece design, and a fisheye lens with a focal length of 2.9 mm is realized. The total optical length is controlled within 30.3 mm, the maximum outer diameter of the lens is smaller than 24.5 mm, the maximum field angle of the head can reach 198 degrees, the full-field relative illumination is larger than 67%, and the field utilization rate is high. The vertical axis chromatic aberration value of the lens is smaller than 3 microns, the chromatic aberration reduction degree of an image is high, and purple edges can be effectively inhibited.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-high definition large-format fisheye lenses, and particularly to an ultra-high definition large-format fisheye lens and an electronic device. Background Art

[0002] A fisheye lens is a wide-angle lens with a special optical design, which can present a very large viewing angle and distortion effect, and can capture a very wide viewing range. Fisheye lenses can be applied to security monitoring, panoramic simulation, dome projection, etc. Compared with other imaging systems, fisheye lenses have advantages such as light weight and small size. However, most of the existing fisheye lenses have one or more of the following defects:

[0003] First, the existing fisheye lenses have a small field of view angle, a small lens observation range, and insufficient captured frame size;

[0004] Second, the existing fisheye lenses have low resolution and poor clarity;

[0005] Third, the existing fisheye lenses have poor color reproducibility during the imaging process. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide an ultra-high definition large-format fisheye lens and an electronic device. This lens can at least solve one of the technical drawbacks mentioned in the background art.

[0007] According to one aspect of the present invention, there is provided an ultra-high definition large-format fisheye lens, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged in sequence along the optical axis from the object side to the image side;

[0008] The first lens has a negative refractive power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave;

[0009] The second lens has a negative refractive power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave;

[0010] The third lens has a negative refractive power, the object side surface of the third lens is concave, and the image side surface of the third lens is convex or concave;

[0011] The fourth lens has a positive refractive power, the object side surface of the fourth lens is concave or convex, and the image side surface of the fourth lens is convex;

[0012] The fifth lens has a positive refractive power, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is flat;

[0013] The sixth lens has a negative refractive power. The object side surface of the sixth lens is concave, and the image side surface of the sixth lens is convex;

[0014] The seventh lens has a positive refractive power. The object side surface of the seventh lens is convex, and the image side surface of the seventh lens is convex;

[0015] The eighth lens has a negative refractive power. The object side surface of the eighth lens is concave, and the image side surface of the eighth lens is concave;

[0016] The ninth lens has a positive refractive power. The object side surface of the ninth lens is convex, and the image side surface of the ninth lens is convex;

[0017] The tenth lens has a positive refractive power. The object side surface of the tenth lens is convex, and the image side surface of the ninth lens is convex.

[0018] The lens of the present invention adopts a ten-piece design, realizing a fish-eye lens with a focal length of 2.9 mm. The overall optical length is controlled within 30.3 mm, the maximum outer diameter of the lens is less than 24.5 mm, the maximum field of view angle of the head can reach 198°, the relative illumination of the full field of view is greater than 67%, and the field of view utilization rate is high. The lateral chromatic aberration of the lens is less than 3 μm, the chromatic aberration reduction degree of the image is high, and purple fringing can be effectively suppressed.

[0019] According to another aspect of the present invention, there is provided an electronic device, including the above-mentioned ultra-high-definition large-format fish-eye lens; and an image sensor configured to receive the image formed by the ultra-high-definition large-format fish-eye lens. In this technical solution, the advantages of the electronic device rely on the ultra-high-definition large-format fish-eye lens, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is the optical system structure diagram of the lens in Embodiment 1.

[0022] Figure 2 It is the MTF diagram of Embodiment 1 in the visible light band.

[0023] Figure 3 It is the optical distortion and field curvature diagram of Embodiment 1.

[0024] Figure 4 It is the lateral chromatic aberration diagram of Embodiment 1.

[0025] Figure 5 It is the relative illuminance diagram of Example 1.

[0026] Figure 6 It is the structural diagram of the optical system of the lens in Example 2.

[0027] Figure 7 It is the MTF diagram of Example 2 in the visible light band.

[0028] Figure 8 It is the optical distortion and field curvature diagram of Example 2.

[0029] Figure 9 It is the lateral chromatic aberration diagram of Example 2.

[0030] Figure 10 It is the relative illuminance diagram of Example 2.

[0031] Figure 11 It is the structural schematic diagram of the electronic device of the present invention.

[0032] L1, the first lens; L2, the second lens; L3, the third lens; L4, the fourth lens; L5, the fifth lens; L6, the sixth lens; L7, the seventh lens; L8, the eighth lens; L9, the ninth lens; L10, the tenth lens; ST, the aperture stop; G, the protective glass; IMA, the imaging surface. Detailed implementation manners

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be specifically noted that the following embodiments are only used to illustrate the present invention, but do not limit the scope of the present invention. Similarly, the following embodiments are only partial embodiments of the present invention rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0034] The object of the present invention is to provide an ultra-high-definition large-format fisheye lens, which is characterized by including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence along the optical axis from the object side to the image side, and an aperture stop is provided between the sixth lens and the seventh lens;

[0035] The first lens has a negative refractive power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

[0036] The second lens has a negative refractive power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

[0037] The third lens has a negative refractive power, the object side of the third lens is concave, and the image side of the third lens is convex or concave;

[0038] The fourth lens has a positive refractive power, the object side of the fourth lens is concave or convex, and the image side of the fourth lens is convex;

[0039] The fifth lens has a positive refractive power, the object side of the fifth lens is convex, and the image side of the fifth lens is flat;

[0040] The sixth lens has a negative refractive power, the object side of the sixth lens is concave, and the image side of the sixth lens is convex;

[0041] The seventh lens has a positive refractive power, the object side of the seventh lens is convex, and the image side of the seventh lens is convex;

[0042] The eighth lens has a negative refractive power, the object side of the eighth lens is concave, and the image side of the eighth lens is concave;

[0043] The ninth lens has a positive refractive power, the object side of the ninth lens is convex, and the image side of the ninth lens is convex;

[0044] The tenth lens has a positive refractive power, the object side of the tenth lens is convex, and the image side of the ninth lens is convex.

[0045] Among them, with reference to Figure 1 、 Figure 6 as shown. In the figure, the first lens is denoted by the reference numeral L1, the second lens is denoted by the reference numeral L2, the third lens is denoted by the reference numeral L3, the fourth lens is denoted by the reference numeral L4, the fifth lens is denoted by the reference numeral L5, the sixth lens is denoted by the reference numeral L6, the seventh lens is denoted by the reference numeral L7, the eighth lens is denoted by the reference numeral L8, the ninth lens is denoted by the reference numeral L9, the tenth lens is denoted by the reference numeral L10, the aperture stop is denoted by the reference numeral ST, the protective glass is denoted by the reference numeral G, and the imaging surface is denoted by IMA.

[0046] Specifically, in Embodiment 1, the image side of the third lens is convex; the object side of the fourth lens is concave, and the third lens and the fourth lens are cemented lenses.

[0047] Specifically, in Embodiment 2, the image side of the third lens is concave; the object side of the fourth lens is convex, and the third lens and the fourth lens are cemented lenses.

[0048] As an embodiment, the lens satisfies the following relational expressions: Nd1 ≥ 2; 11 < |f1| < 16; where Nd1 is the refractive index of the first lens, and f1 is the focal length of the first lens. The beneficial effect of this embodiment is that: by the first lens satisfying the above formula, light can be bent more effectively, so that a larger light collection ability can be achieved at a shorter focal length, which can improve the brightness and clarity of the image, and is beneficial to controlling the maximum aperture of the system.

[0049] As an embodiment, the lens satisfies the following relational expression: |Vd8 - Vd7| > 28; where Vd7 is the Abbe number of the seventh lens, Vd8 is the Abbe coefficient of the eighth lens, and the seventh lens and the eighth lens are a cemented lens group. The beneficial effect of this embodiment is that: the diaphragm is arranged with the seventh lens and the eighth lens being cemented to each other, and by selecting the seventh lens and the eighth lens with a large difference in Abbe numbers for matching, not only can chromatic aberration be effectively corrected, but it also helps greatly in improving the imaging clarity of the off-axis field of view.

[0050] As an embodiment, the lens satisfies the following relational expression: 0.10 < BFL / TTL < 0.12, where BFL is the back focal length of the lens optical system, and TTL is the total length of the lens optical system. The beneficial effect of this embodiment is that: by satisfying the above relational expression, the lens can have a shorter total length while maintaining a certain back focal length, which is beneficial to the compact design and miniaturization of the lens system, and is convenient for installation and use in various devices.

[0051] As an embodiment, the lens satisfies the following relational expression: 1.0 < BFL / f < 1.3; where BFL is the back focal length of the lens optical system, and f is the total focal length of the lens optical system. The beneficial effect of this embodiment is that: by satisfying the above relational expression, a reasonable ratio of BFL to f can enable the lens to better match imaging sensors of different sizes, ensure the consistency and stability of the imaging effect, and improve the versatility and adaptability of the lens.

[0052] As an embodiment, the lens satisfies the following relational expressions:

[0053] The absolute value of the ratio of the focal length f1 of the first lens to the overall focal length f of the lens satisfies the following relational expression: 3 ≤ |f1 / f| ≤ 6;

[0054] The absolute value of the ratio of the focal length f2 of the second lens to the overall focal length f of the lens satisfies the following relational expression: 2 ≤ |f2 / f| ≤ 4;

[0055] The absolute value of the ratio of the focal length f3 of the third lens to the overall focal length f of the lens satisfies the following relational expression: 1.5 ≤ |f3 / f| ≤ 3.5;

[0056] The absolute value of the ratio of the focal length f4 of the fourth lens to the overall focal length f of the lens satisfies the following relationship: 5 ≤ |f4 / f| ≤ 5;

[0057] The absolute value of the ratio of the focal length f5 of the fifth lens to the overall focal length f of the lens satisfies the following relationship: 2 ≤ |f5 / f| ≤ 3;

[0058] The absolute value of the ratio of the focal length f6 of the sixth lens to the overall focal length f of the lens satisfies the following relationship: 10 ≤ |f6 / f| ≤ 16;

[0059] The absolute value of the ratio of the focal length f7 of the seventh lens to the overall focal length f of the lens satisfies the following relationship: 1 ≤ |f7 / f| ≤ 2;

[0060] The absolute value of the ratio of the focal length f8 of the eighth lens to the overall focal length f of the lens satisfies the following relationship: 0.5 ≤ |f8 / f| ≤ 1.5;

[0061] The absolute value of the ratio of the focal length f9 of the ninth lens to the overall focal length f of the lens satisfies the following relationship: 3 ≤ |f9 / f| ≤ 4;

[0062] The focal length f 10 of the tenth lens and the overall focal length f of the lens satisfy the following relationship: 4 ≤ |f 10 / f| ≤ 6.

[0063] The beneficial effects of the above embodiments are as follows: By reasonably allocating the focal length values of each lens, the combined focal length of the lens is reduced, the structure of the lens is compacted, and miniaturization of the lens is achieved.

[0064] In Embodiment 1, the sixth lens, the ninth lens, and the tenth lens are glass aspherical lenses. The beneficial effects of this embodiment are as follows: By selecting the above lenses as glass aspherical lenses, aberrations, especially spherical aberration and coma, can be effectively corrected, thereby improving the resolution and contrast of the lens and making the imaging clearer and sharper.

[0065] In Embodiment 2, the second lens, the sixth lens, and the tenth lens are glass aspherical lenses. The beneficial effects of this embodiment are as follows: By selecting the above lenses as glass aspherical lenses, aberrations, especially spherical aberration and coma, can be effectively corrected, thereby improving the resolution and contrast of the lens and making the imaging clearer and sharper.

[0066] As an embodiment, the lens satisfies the following relationship:

[0067] The refractive index Nd2 of the second lens satisfies the following relationship: 1.6 < Nd2 < 2.0;

[0068] The refractive index Nd3 of the third lens satisfies the following relational expression: 1.7 < Nd3 < 2.1;

[0069] The refractive index Nd4 of the fourth lens satisfies the following relational expression: 1.7 < Nd4 < 2.1;

[0070] The refractive index Nd5 of the fifth lens satisfies the following relational expression: 1.8 < Nd5 < 2.8;

[0071] The refractive index Nd6 of the sixth lens satisfies the following relational expression: 1.3 < Nd6 < 1.7;

[0072] The refractive index Nd7 of the seventh lens satisfies the following relational expression: 1.4 < Nd7 < 1.8;

[0073] The refractive index Nd8 of the eighth lens satisfies the following relational expression: 1.6 < Nd8 < 2.1;

[0074] The refractive index Nd8 of the ninth lens satisfies the following relational expression: 1.4 < Nd9 < 1.8;

[0075] The refractive index Nd of the tenth lens 10 satisfies the following relational expression: 1.3 < Nd 10 < 1.7

[0076] The beneficial effects of the above embodiments are as follows: By reasonably distributing the refractive indices of each lens, the propagation path of light can be effectively controlled, reducing aberration, thereby improving the clarity and contrast of imaging.

[0077] In summary, the beneficial effects of the present invention are as follows:

[0078] First, the lens of this patent adopts an all-glass structure, which includes seven glass spherical lenses and three glass aspherical lenses, realizing a fish-eye lens with a focal length of 2.9 mm.

[0079] Second, the overall dimensions of the machine are φ30 * 30.2 mm, the maximum outer diameter of the lens is less than 24.5 mm, and the overall optical length is less than 30.3 mm.

[0080] Third, the system can be used with a 1 / 1.32-inch sensor with 50 million pixels, having a high imaging resolution.

[0081] Fourth, the maximum field of view angle of the lens can reach 198°, the relative illumination of the full field of view is greater than 67%, and the field of view utilization rate is high.

[0082] Fifth, the lateral chromatic aberration value of the lens is less than 3 um, the chromatic aberration reduction degree of the image is high, and purple fringing can be effectively suppressed.

[0083] The present invention will be described in more detail with reference to the following table. It should be noted that the following table is only a specific embodiment of the present invention, rather than a restrictive example.

[0084] For convenience of description, in the table, surface serial number 1 and surface serial number 2 are the object side and the image side of the first lens respectively; surface serial number 3 and surface serial number 4 are the object side and the image side of the second lens respectively; surface serial number 5 and surface serial number 6 are the object side and the image side of the third lens respectively; surface serial number 6 and surface serial number 7 are the object side and the image side of the fourth lens respectively; surface serial number 8 and surface serial number 9 are the object side and the image side of the fifth lens respectively; surface serial number 10 and surface serial number 11 are the object side and the image side of the sixth lens respectively; surface serial number 12 is the surface of the aperture stop; surface serial number 13 and surface serial number 14 are the object side and the image side of the seventh lens respectively; surface serial number 14 and surface serial number 15 are the object side and the image side of the eighth lens respectively; surface serial number 16 and surface serial number 17 are the object side and the image side of the ninth lens respectively; surface serial number 18 and surface serial number 19 are the object side and the image side of the tenth lens respectively; surface serial number 20 and surface serial number 21 are the object side and the image side of the protective glass respectively; surface serial number 22 is the surface of the imaging plane.

[0085] For the optical structure of Embodiment 1, please refer to Figure 1 , and the specific parameters of this Embodiment 1 are shown in Table 1 below. In this Embodiment 1, the lens focal length f = 2.9 mm, and the total length TTL = 30.24 mm.

[0086] Table 1 - Lens Parameter Table of Embodiment 1

[0087] Surface number Surface Radius of curvature Thickness interval Refractive index Abbe number Focal length value 1 First lens 17.6 1.22 2 29.1 -15.4 2 7.96 4.4 3 Second lens 19.83 0.77 1.8 46.6 -7.3 4 4.5 4.2 5 Third lens -5.5 0.7 1.9 20.9 -9 6 Fourth lens -17.3 2.2 1.9 35.3 12 7 -7.14 0.1 8 Fifth lens 7.7 2.16 2 26.9 7.3 9 Infinity 0.66 10 Sixth lens -7 1.1 1.5 64 -32.9 11 -12.6 1 12 Diaphragm Infinity 0.7 13 Seventh lens 5.8 1.9 1.6 68.3 4.40 14 Eighth lens -4.1 0.7 1.85 23.8 -3.00 15 7.5 0.3 16 Ninth lens 10 1.9 1.5 81.6 10.3 17 -9.9 0.12 18 Tenth lens 9.96 2.71 1.5 81.6 15 19 -27 0.1 20 Protective glass 0.3 Infinity 21 Infinity 3 22 Imaging plane - -

[0088] According to Table 1, the conditional expressions of Embodiment 1 of the present invention are as follows:

[0089] (1) The refractive index Nd1 of the first lens = 2; the focal length value f1 of the first lens = -15.4; the absolute value of the ratio of the focal length f1 of the first lens to the overall focal length f of the lens: |f1 / f| = 5.31.

[0090] (2) The refractive index Nd2 of the second lens = 1.8; the focal length value f2 of the second lens = -7.3; the absolute value of the ratio of the focal length f2 of the second lens to the overall focal length f of the lens: |f2 / f| = 2.52.

[0091] (3) The refractive index Nd3 of the third lens = 1.9; the focal length value f3 of the third lens = -9; the absolute value of the ratio of the focal length f3 of the third lens to the overall focal length f of the lens: |f3 / f| = 3.10.

[0092] (4) The refractive index Nd4 of the fourth lens is 1.9; the focal length value f4 of the fourth lens is 12; the absolute value of the ratio of the focal length f4 of the fourth lens to the overall focal length f of the lens: |f4 / f| = 4.14.

[0093] (5) The refractive index Nd5 of the fifth lens is 2; the focal length value f5 of the fifth lens is 7.3; the absolute value of the ratio of the focal length f5 of the fifth lens to the overall focal length f of the lens: |f5 / f| = 2.52.

[0094] (6) The refractive index Nd6 of the sixth lens is 1.5; the focal length value f6 of the sixth lens is -32.9; the absolute value of the ratio of the focal length f6 of the sixth lens to the overall focal length f of the lens: |f6 / f| = 11.34.

[0095] (7) The refractive index Nd7 of the seventh lens is 1.6; the focal length value f7 of the seventh lens is 4.40; the absolute value of the ratio of the focal length f7 of the seventh lens to the overall focal length f of the lens: |f7 / f| = 1.52.

[0096] (8) The refractive index Nd8 of the eighth lens is 1.85; the focal length value f8 of the eighth lens is -3.00; the absolute value of the ratio of the focal length f6 of the eighth lens to the overall focal length f of the lens: |f8 / f| = 1.03.

[0097] (9) The refractive index Nd9 of the ninth lens is 1.5; the focal length value f9 of the ninth lens is 10.3; the absolute value of the ratio of the focal length f9 of the ninth lens to the overall focal length f of the lens: |f9 / f| = 3.55.

[0098] (10) The refractive index Nd of the tenth lens 10 = 1.5; the focal length value f of the tenth lens 10 = 15; the focal length f of the tenth lens 10 and the absolute value of the ratio of the overall focal length f of the lens: |f 10 / f| = 5.17.

[0099] Table 2 - Aspherical coefficient arrangement table of each aspherical lens in Example 1

[0100]

[0101]

[0102] For the optical structure of Example 2, please refer to Figure 6 , and the specific parameters of this Example 2 are shown in Table 3 below. In this Example 2, the lens focal length f = 2.9 mm, and the total length TTL = 29.91 mm.

[0103] Table 3 - Lens parameter table of Example 2

[0104] Surface number Surface Radius of curvature Thickness interval Refractive index Abbe number Focal length value 1 First lens 17 1.35 2 29.1 -11 2 6.4 2.76 3 Second lens 13 0.8 1.8 41 -9.5 4 4.7 4.5 5 Third lens -6.1 0.7 1.9 20.9 -6 6 Fourth lens 72.5 2.5 1.9 25.4 8 7 -8.9 0.1 8 Fifth lens 8.1 2.1 2 26.9 7.6 9 Infinity 0.7 10 Sixth lens -6.8 1.5 1.5 81.6 -42.4 11 -10.8 1.1 12 Diaphragm Infinity 0.1 13 Seventh lens 5.8 2.4 1.6 68.3 4.10 14 Eighth lens -3.6 0.7 1.85 23.8 -2.80 15 8.1 0.3 16 Ninth lens 12.6 2 1.6 65.5 10.8 17 -12.6 0.1 18 Tenth lens 10 2.8 1.5 81.6 13.2 19 -17.5 0.1 20 Protective glass Infinity 0.3 Infinity 21 Infinity 3 22 Imaging plane - -

[0105] According to Table 1, the conditional expressions of Embodiment 1 of the present invention can be read as follows:

[0106] (1) The refractive index Nd1 of the first lens = 2; the focal length value f1 of the first lens = -11; the absolute value of the ratio of the focal length f1 of the first lens to the overall focal length f of the lens: |f1 / f| = 3.79.

[0107] (2) The refractive index Nd2 of the second lens = 1.8; the focal length value f2 of the second lens = -9.5; the absolute value of the ratio of the focal length f2 of the second lens to the overall focal length f of the lens: |f2 / f| = 3.28.

[0108] (3) The refractive index Nd3 of the third lens = 1.9; the focal length value f3 of the third lens = -6; the absolute value of the ratio of the focal length f3 of the third lens to the overall focal length f of the lens: |f3 / f| = 2.07.

[0109] (4) The refractive index Nd4 of the fourth lens = 1.9; the focal length value f4 of the fourth lens = 8; the absolute value of the ratio of the focal length f4 of the fourth lens to the overall focal length f of the lens: |f4 / f| = 2.76.

[0110] (5) The refractive index Nd5 of the fifth lens = 2; the focal length value f5 of the fifth lens = 7.6; the absolute value of the ratio of the focal length f5 of the fifth lens to the overall focal length f of the lens: |f5 / f| = 2.62.

[0111] (6) The refractive index Nd6 of the sixth lens = 1.5; the focal length value f6 of the sixth lens = -42.4; the absolute value of the ratio of the focal length f6 of the sixth lens to the overall focal length f of the lens: |f6 / f| = 14.62.

[0112] (7) The refractive index Nd7 of the seventh lens = 1.6; the focal length value f7 of the seventh lens = 4.10; the absolute value of the ratio of the focal length f7 of the seventh lens to the overall focal length f of the lens: |f7 / f| = 1.41.

[0113] (8) The refractive index Nd8 of the eighth lens = 1.85; the focal length value f8 of the eighth lens = -2.80; the absolute value of the ratio of the focal length f6 of the eighth lens to the overall focal length f of the lens: |f8 / f| = 0.97.

[0114] (9) The refractive index Nd9 of the ninth lens = 1.6; the focal length value f9 of the ninth lens = 10.8; the absolute value of the ratio of the focal length f9 of the ninth lens to the overall focal length f of the lens: |f9 / f| = 3.72.

[0115] (10) Refractive index Nd of the tenth lens 10 = 1.5; Focal length value f of the tenth lens 10 = 13.2; Focal length f of the tenth lens 10 Absolute value of the ratio of the focal length f of the tenth lens to the overall focal length f of the lens: |f 10 / f| = 4.55.

[0116] Table 4 - Aspherical coefficient arrangement table of each aspherical lens in Example 1

[0117]

[0118]

[0119] Table 5 - Various parameter table of the lens

[0120] Example 1 Example 2 Focal length f 2.9 2.9 Back focal length BFL 3.4 3.4 BFL / f 1.172413793 1.172413793 Image plane y 9.6 9.6 y / f 3.310344828 3.310344828 Overall length TTL 30.24 29.91 BFL / TTL 0.112433862 0.113674356

[0121] The following are the explanatory notes for each drawing in Examples 1 to 2:

[0122] Figure 2 It is the MTF graph of Example 1 in the visible light band. As can be seen from the graph, the contrast of the full field of view is greater than 0.4 at 200 lp / mm, approaching the diffraction limit, the imaging quality is uniform, and it has high resolution.

[0123] Figure 3 It is the optical distortion and field curvature graph of Example 1. As can be seen from the graph, the F-Theta distortion is less than 4%, the field curvature control is good, and the image reduction degree is high.

[0124] Figure 4 It is the lateral chromatic aberration graph of Example 1. As can be seen from the graph, the maximum chromatic aberration value is less than 2.8 um, the color reduction degree is good, and it can effectively suppress purple fringing.

[0125] Figure 5 It is the relative illumination graph of Example 1. As can be seen from the graph, the relative illumination of the full field of view is greater than 67%, and the energy utilization rate is high.

[0126] Figure 7 It is the MTF graph of Example 2 in the visible light band. As can be seen from the graph, the contrast of the full field of view is greater than 0.4 at 200 lp / mm, approaching the diffraction limit, the imaging quality is uniform, and it has high resolution.

[0127] Figure 8 It is the optical distortion and field curvature graph of Example 2. As can be seen from the graph, the F-Theta distortion is less than 4%, the field curvature control is good, and the image reduction degree is high.

[0128] Figure 9It is the lateral chromatic aberration diagram of Example 2. As can be seen from the figure, the maximum chromatic aberration value is less than 2.8um, and the color restoration degree can effectively suppress purple fringing.

[0129] Figure 10 It is the relative illumination diagram of Example 2. As can be seen from the figure, the relative illumination of the full field of view is greater than 67%, and the energy utilization rate is high.

[0130] On the other hand, referring now to Figure 11 , a schematic structural diagram of electronic device A according to the present invention will be given. Figure 11 It is a schematic diagram of an electronic device (camera) that uses any one of the ultra-high-definition large-format fisheye lenses according to Embodiments 1 to 2 in a camera optical system.

[0131] In Figure 11 , reference numeral A2 denotes the main body of the electronic device, and reference numeral A1 denotes a camera optical system (interchangeable lens) including any one of the ultra-high-definition large-format fisheye lenses according to Examples 1 to 2. Reference numeral A3 denotes an image sensor (photoelectric conversion element) such as a CMOS image sensor or a CCD image sensor, which is built into the camera body A2 and receives light (the optical image formed by the camera optical system A1) from the camera optical system A1 and performs photoelectric conversion.

[0132] By using the ultra-high-definition large-format fisheye lens according to any one of Embodiments 1 to 2 in an electronic device such as a digital still camera, an electronic device with high optical performance can be obtained.

[0133] Each example can provide an electronic device with high optical performance.

[0134] Although the present invention has been described with reference to exemplary embodiments, it should be understood that the present invention is not limited to the disclosed exemplary embodiments. The scope of the following claims will be given the broadest interpretation to cover all such modifications and equivalent structures and functions.

Claims

1. An ultra-high-definition large-surface fisheye lens, characterized in that: comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence along the optical axis from the object side to the image side; The first lens has a negative refractive power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; The second lens has a negative refractive power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; The third lens has a negative refractive power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface or a concave surface; The fourth lens has positive refractive power, the object side surface of the fourth lens is concave or convex, and the image side surface of the fourth lens is convex; The fifth lens has positive refractive power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a flat surface; The sixth lens has a negative refractive power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; The seventh lens has positive refractive power, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a convex surface; The eighth lens has a negative refractive power, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a concave surface; The ninth lens has positive refractive power, the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a convex surface; The tenth lens has positive refractive power, the object side surface of the tenth lens is a convex surface, and the image side surface of the ninth lens is a convex surface.

2. The ultra-high-definition large-surface fisheye lens according to claim 1, characterized in that: The lens satisfies the following relationship: Nd1≥2; 11<|f1|<16; Wherein, Nd1 is the refractive index of the first lens, and f1 is the focal length of the first lens.

3. The ultra-high-definition large-surface fisheye lens according to claim 1, characterized in that: The lens satisfies the following relationship: |Vd8-Vd7|>28; Wherein, Vd7 is the Abbe number of the seventh lens, Vd8 is the Abbe coefficient of the eighth lens, and the seventh lens and the eighth lens are a cemented lens group.

4. The ultra-high-definition large-surface fisheye lens according to claim 1, characterized in that: The lens satisfies the following relationship: 0.10<BFL / TTL<0.12; Among them, BFL is the optical back focus of the lens, and TTL is the total optical length of the lens.

5. The ultra-high-definition large-surface fisheye lens according to claim 1, characterized in that: The lens satisfies the following relationship: 1.0<BFL / f<1.3; Among them, BFL is the optical back focus of the lens, and f is the total optical focal length of the lens.

6. The ultra-high-definition large-surface fisheye lens according to claim 1, characterized in that: The lens satisfies the following relationship: The absolute value of the ratio of the focal length f1 of the first lens to the overall focal length f of the lens satisfies the following relationship: 3≤|f1 / f|≤6; The absolute value of the ratio of the focal length f2 of the second lens to the overall focal length f of the lens satisfies the following relationship: 2≤|f2 / f|≤4; The absolute value of the ratio of the focal length f3 of the third lens to the overall focal length f of the lens satisfies the following relationship: 1.5≤|f3 / f|≤3.5; The absolute value of the ratio of the focal length f4 of the fourth lens to the overall focal length f of the lens satisfies the following relationship: 5≤|f4 / f|≤5; The absolute value of the ratio of the focal length f5 of the fifth lens to the overall focal length f of the lens satisfies the following relationship: 2≤|f5 / f|≤3; The absolute value of the ratio of the focal length f6 of the sixth lens to the overall focal length f of the lens satisfies the following relationship: 10≤|f6 / f|≤16; The absolute value of the ratio of the focal length f7 of the seventh lens to the overall focal length f of the lens satisfies the following relationship: 1≤|f7 / f|≤2; The absolute value of the ratio of the focal length f8 of the eighth lens to the overall focal length f of the lens satisfies the following relationship: 0.5≤|f8 / f|≤1.5; The absolute value of the ratio of the focal length f9 of the ninth lens to the overall focal length f of the lens satisfies the following relationship: 3≤|f9 / f|≤4; The focal length f of the tenth lens 10 The absolute value of the ratio to the overall focal length f of the lens satisfies the following relationship: 4≤|f 10 / f|≤6.

7. The ultra-high-definition large-surface fisheye lens according to claim 1, characterized in that: The lens satisfies the following relationship: the sixth lens, the ninth lens and the tenth lens are glass aspherical lenses.

8. The ultra-high-definition large-surface fisheye lens according to claim 1, characterized in that: The lens satisfies the following relationship: the second lens, the sixth lens and the tenth lens are glass aspherical lenses.

9. The ultra-high-definition large-surface fisheye lens according to claim 1, characterized in that: The lens satisfies the following relationship: The refractive index Nd2 of the second lens satisfies the following relationship: 1.6<Nd2<2.0; The refractive index Nd3 of the third lens satisfies the following relationship: 1.7<Nd3<2.1; The refractive index Nd4 of the fourth lens satisfies the following relationship: 1.7<Nd4<2.1; The refractive index Nd5 of the fifth lens satisfies the following relationship: 1.8<Nd5<2.8; The refractive index Nd6 of the sixth lens satisfies the following relationship: 1.3<Nd6<1.7; The refractive index Nd7 of the seventh lens satisfies the following relationship: 1.4<Nd7<1.8; The refractive index Nd8 of the eighth lens satisfies the following relationship: 1.6<Nd8<2.1; The refractive index Nd8 of the ninth lens satisfies the following relationship: 1.4<Nd9<1.8; The refractive index Nd of the tenth lens 10 Satisfies the following relationship: 1.3<Nd 10 <1.

7.

10. An electronic device, characterized in that: An ultra-high-definition large-surface fisheye lens according to any one of claims 1 to 9; and An image sensor is configured to receive an image formed by the ultra-high-definition large-surface fisheye lens.

Images