A high-pixel, large-aperture, all-glass motion DV lens

Abstract

The present invention discloses a high-pixel, large-aperture, all-glass motion DV lens, the motion DV lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side along the optical axis, the first lens to the sixth lens are all glass spherical lenses, the first lens is a convex-concave negative power lens, the second lens is a double-concave negative power lens, the third lens is a double-convex positive power lens, the fourth lens is a double-convex positive power lens, the fifth lens is a concave-convex negative power lens, and the sixth lens is a double-convex positive power lens. The high-pixel, large-aperture, all-glass motion DV lens provided by the present invention achieves a 13-megapixel resolution, an F2.4 aperture and a matching 1 / 3-inch image sensor.

Description

Technical Field

[0001] The invention belongs to the technical field of optical lenses, and in particular relates to a high-pixel, large-aperture, all-glass motion DV lens. Background Art

[0002] In recent years, with the rapid development of optical technology and image processing technology and the changes in human life needs, a large number of optical lenses that meet different usage scenarios, specifications and types have emerged on the market. In order to meet people's needs for filming and recording when experiencing high-speed extreme sports, sports DV lenses have emerged, which are small in size, easy to carry and can shoot at close range.

[0003] At present, most of the motion DV lenses on the market only meet the resolution of 5 million to 8 million pixels, and the lens F number is mostly greater than 2.6. The lens design adopts a structure of 6 or 7 glass spherical lenses, which gives full play to the characteristics of easy processing of glass spherical lenses. For example, the Chinese patent document with publication number CN106772947A discloses a large-scale motion DV lens, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the object side to the image side, the first lens is a convex-concave negative focal glass spherical lens, the second lens is a double-concave negative focal glass spherical lens, the third lens is a double-convex positive focal glass spherical lens, the fourth lens is a double-convex positive focal glass spherical lens, the fifth lens is a double-concave negative focal glass spherical lens; the sixth lens is a plano-convex positive focal glass spherical lens, and the seventh lens is a double-convex positive focal glass spherical lens. For example, a Chinese patent document with publication number CN207586520 discloses a sports DV optical lens, in which a first spherical convex lens, a second spherical convex lens, a third spherical concave lens, a fourth spherical concave lens, a fifth spherical convex lens and a sixth spherical convex lens are arranged in sequence from the outside to the inside, and the centers of the first spherical convex lens, the second spherical convex lens, the third spherical concave lens, the fourth spherical concave lens, the fifth spherical convex lens and the sixth spherical convex lens are located on the same horizontal straight line; the outer diameter of the first spherical convex lens is 15.5 mm, the outer diameters of the second spherical convex lens and the third spherical concave lens are both 8 mm, the fourth spherical concave lens and the fifth spherical convex lens are connected together by glue, and the sixth spherical convex lens is abutted against the second spherical convex lens.

[0004] However, these lenses generally have the disadvantages of low resolution and small aperture. In harsh outdoor environments, the small aperture of the lens requires a longer exposure time to capture images, which cannot meet the needs of extreme sports enthusiasts; the low resolution leads to poor detail expression in the captured images and recorded videos.

[0005] There are also a small number of sports DV lenses on the market that use plastic aspherical lenses, which can achieve tens of millions of pixels, a large aperture of F2.0, high resolution and short exposure time. However, the mold opening cost of plastic aspherical lenses is relatively high, and compared with spherical lenses, the environmental stability is poorer. In high or low temperature environments, the imaging quality of plastic aspherical lenses may decrease.

[0006] It can be seen that there are almost no sports DV lenses on the market that can achieve 13 million pixel resolution, F2.4 aperture, match 1 / 3 inch image sensor and use six full-glass lens structure. Therefore, it is urgent to develop a 13 million pixel, F2.4 aperture, match 1 / 3 inch image sensor full-glass sports DV lens to fill the market gap. Summary of the invention

[0007] The invention discloses a high-pixel large-aperture all-glass motion DV lens, which realizes 13 million pixel resolution, F2.4 aperture and matches a 1 / 3 inch image sensor.

[0008] The technical solution adopted by the present invention is:

[0009] A high-pixel, large-aperture, all-glass motion DV lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side along the optical axis; the first lens is a convex-concave negative power lens, the second lens is a bi-concave negative power lens, the third lens is a bi-convex positive power lens, the fourth lens is a bi-convex positive power lens, the fifth lens is a concave-convex negative power lens, and the sixth lens is a bi-convex positive power lens.

[0010] The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses.

[0011] Furthermore, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively satisfy the following conditional formula with the entire lens:

[0012] 2.0<|f1 / f|<6.0;

[0013] 1.0<|f2 / f|<4.0;

[0014] 1.7<|f3 / f|<5.5;

[0015] 0.5<|f4 / f|<3.5;

[0016] 1.0<|f5 / f|<4.0;

[0017] 2.5<|f6 / f|<7.0;

[0018] Among them, f is the focal length of the entire lens, and f1, f2, f3, f4, f5 and f6 correspond to the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively.

[0019] Further preferably, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively satisfy the following conditional formula with the entire lens:

[0020] 3.4<|f1 / f|<3.9;

[0021] 2.0<|f2 / f|<2.2;

[0022] 2.35<|f3 / f|<2.6;

[0023] 1.3<|f4 / f|<1.5;

[0024] 1.8<|f5 / f|<2.1;

[0025] 3.9<|f6 / f|<4.3;

[0026] Where f is the focal length of the entire lens, and f1, f2, f3, f4, f5, and f6 correspond to the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens, respectively. The MTF curve obtained by optimization within this range is closer to the diffraction limit, and the spot diagram size is smaller.

[0027] Furthermore, the fourth lens and the fifth lens are cemented to form a cemented lens, and the cemented lens and the entire lens meet the following conditional formula:

[0028] 5.5<|f e / f|<6.5;

[0029] Among them, f e is the focal length of the doublet lens.

[0030] Furthermore, the focal length, refractive index and curvature radius of the first to sixth lenses satisfy the following conditions:

[0031] -15<f1<-5 1.5<n1<1.8 10<R1<20 3<R2<5 -6.5<f2<-3 1.5<n2<1.75 -35<R3<-15 3<R4<5 5<f3<7.5 1.75<n3<2 5.5<R5<7.5 -65<R6<-40 2.5<f4<6.5 1.55<n4<1.75 15<R7<35 -3.5<R8<-1.5 -3.5<f5<-6.5 1.75<n5<2.05 -3.5<R9<-1.5 -7.5<R10<-5.5 9.5<f6<12.5 1.65<n6<1.95 10<R11<18 -30<R12<-20

[0032] Among them, "f" is the focal length, "n" is the refractive index, "R" is the radius of curvature, and the "-" sign indicates that the direction is negative;

[0033] Among them, f1 to f6 correspond to the focal lengths of the first to sixth lenses respectively; n1 to n6 correspond to the refractive indices of the first to sixth lenses respectively; R1, R3, R5, R7, R9, and R11 correspond to the curvature radii of the first to sixth lenses close to the object side respectively, and R2, R4, R6, R8, R10, and R12 correspond to the curvature radii of the first to sixth lenses away from the object side respectively.

[0034] Further preferably, the focal length, refractive index and curvature radius of the first to sixth lenses satisfy the following conditions:

[0035]

[0036]

[0037] Among them, "f" is the focal length, "n" is the refractive index, "R" is the radius of curvature, and the "-" sign indicates that the direction is negative;

[0038] Among them, f1 to f6 correspond to the focal lengths of the first to sixth lenses respectively; n1 to n6 correspond to the refractive indices of the first to sixth lenses respectively; R1, R3, R5, R7, R9, and R11 correspond to the curvature radii of the first to sixth lenses close to the object side respectively, and R2, R4, R6, R8, R10, and R12 correspond to the curvature radii of the first to sixth lenses away from the object side respectively.

[0039] The total length of the sports DV lens is less than 22.5 mm, the field of view angle is greater than 150° and it is matched with a 1 / 3 inch image sensor.

[0040] The present invention uses 6 glass spherical lenses to form a 6-piece optical structure, which simplifies the structure of the optical lens and reduces the weight of the optical lens. And through the reasonable layout of the lenses and the selection of optical materials, the resulting image quality is good, the cost is low, and it can achieve 13 million pixels, a maximum aperture of F2.4, match a 1 / 3-inch image sensor, a total length of less than 22.5 mm, and a field of view angle of more than 150° and other indicators.

[0041] The invention has the beneficial effect of realizing 13 million pixels and a maximum aperture of F2.4 by utilizing a 6-piece all-glass spherical lens structure, matching a 1 / 3-inch image sensor, having a total length of less than 22.5 mm, and a high-pixel, large-aperture all-glass motion DV lens with a field of view greater than 150°. The invention solves the common shortcomings of low resolution and small aperture of existing all-glass structure motion DV lenses on the market, as well as the shortcomings of high cost and poor stability of glass-plastic hybrid motion DV lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1Schematic diagram of the optical system of the high-pixel, large-aperture, all-glass motion DV lens in Example 1;

[0043] Figure 2 is the MTF curve of the high-pixel, large-aperture, all-glass motion DV lens in Example 1;

[0044] Figure 3 This is the point diagram of the high-pixel, large-aperture, all-glass motion DV lens in Example 1;

[0045] Figure 4 is a schematic diagram of the optical system of the high-pixel, large-aperture, all-glass motion DV lens in Example 2;

[0046] Figure 5 is the MTF curve of the high-pixel, large-aperture, all-glass motion DV lens in Example 2;

[0047] Figure 6 This is the point diagram of the high-pixel, large-aperture, all-glass motion DV lens in Example 2;

[0048] Figure 7 Schematic diagram of the optical system of the high-pixel, large-aperture, all-glass motion DV lens in Example 3;

[0049] Figure 8 This is the MTF curve of the high-pixel, large-aperture, all-glass motion DV lens in Example 3;

[0050] Fig. 9 This is the point diagram of the high-pixel, large-aperture, all-glass motion DV lens in Example 3. DETAILED DESCRIPTION

[0051] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description.

[0052] like Figure 1 , Figure 4 and Figure 7 As shown, they are schematic diagrams of the optical systems of the high-pixel, large-aperture, all-glass motion DV lenses provided in Examples 1-3, respectively. The high-pixel, large-aperture, all-glass motion DV lenses include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens is a convex-concave negative power lens, the second lens is a bi-concave negative power lens, the third lens is a bi-convex positive power lens, the fourth lens is a bi-convex positive power lens, the fifth lens is a concave-convex negative power lens, and the sixth lens is a bi-convex positive power lens; the first lens to the sixth lens are all glass spherical lenses; the fourth lens and the fifth lens are cemented components.

[0053] Specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively satisfy the following conditional expressions with the entire lens:

[0054] 2.0<|f1 / f|<6.0;

[0055] 1.0<|f2 / f|<4.0;

[0056] 1.7<|f3 / f|<5.5;

[0057] 0.5<|f4 / f|<3.5;

[0058] 1.0<|f5 / f|<4.0;

[0059] 2.5<|f6 / f|<7.0;

[0060] Among them, f is the focal length of the entire lens, and f1, f2, f3, f4, f5 and f6 correspond to the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively.

[0061] The fourth lens and the fifth lens are cemented to form a cemented lens, and the cemented lens and the entire lens meet the following conditional formula:

[0062] 5.5<|f e / f|<6.5;

[0063] Among them, f e is the focal length of the doublet lens.

[0064] Example 1

[0065] The high-pixel, large-aperture, all-glass motion DV lens provided in this embodiment is as follows: Figure 1 The optical system structure of the motion DV lens provided in this embodiment achieves the following optical indicators:

[0066] Focal length: f' = 2.60 mm;

[0067] Relative aperture: F = 2.4;

[0068] Field of view: 2w = 150° (matching 1 / 3-inch 13-megapixel image sensor);

[0069] The total length of the optical path is less than 22.5mm;

[0070] Applicable spectral range: 450-700nm.

[0071] The parameters of the first to sixth lenses are shown in the following table:

[0072]

[0073]

[0074] Wherein, R is the center radius of the lens surface, D is the distance from the corresponding optical surface to the next optical surface on the optical axis, nd corresponds to the refractive index of d light (wavelength 587nm); S1 and S2 are the object surface and image surface of the first lens, S3 and S4 are the object surface and image surface of the second lens, S5 and S6 are the object surface and image surface of the third lens, Stop surface is the surface where the aperture is located, S7 and S8 are the object surface and image surface of the fourth lens, S8 and S9 are the object surface and image surface of the fifth lens, S10 and S11 are the object surface and image surface of the sixth lens.

[0075] Figure 2 is the MTF curve of the lens. Figure 2 It can be seen that the center field of view is greater than 0.2 at 450 line pairs, and the edge field of view is greater than 0.2 at 250 line pairs. The lens has good contrast.

[0076] Figure 3 is the lens point diagram. Figure 3 It can be seen that the diameter of the central field of view point diagram is less than 2.3um, and the diameter of the edge field of view point diagram is less than 2.3um. The lens has a higher resolution.

[0077] Example 2

[0078] The high-pixel, large-aperture, all-glass motion DV lens provided in this embodiment is as follows: Figure 4 The optical system structure of the motion DV lens provided in this embodiment achieves the following optical indicators:

[0079] In this embodiment, the optical system structure composed of the above lenses achieves the following optical indicators:

[0080] Focal length: f' = 2.51 mm;

[0081] Relative aperture: F = 2.4;

[0082] Field of view: 2w = 150° (matching 1 / 3-inch 13-megapixel image sensor);

[0083] The total length of the optical path is less than 22.5mm;

[0084] Applicable spectral range: 450-700nm.

[0085] The parameters of the first to sixth lenses are shown in the following table:

[0086]

[0087] Wherein, R is the center radius of the lens surface, D is the distance from the corresponding optical surface to the next optical surface on the optical axis, nd corresponds to the refractive index of d light (wavelength 587nm); S1 and S2 are the object surface and image surface of the first lens, S3 and S4 are the object surface and image surface of the second lens, S5 and S6 are the object surface and image surface of the third lens, Stop surface is the surface where the aperture is located, S7 and S8 are the object surface and image surface of the fourth lens, S8 and S9 are the object surface and image surface of the fifth lens, S10 and S11 are the object surface and image surface of the sixth lens.

[0088] Figure 5 is the MTF curve of the lens. Figure 5 It can be seen that the center field of view is greater than 0.2 at 450 line pairs, and the edge field of view is greater than 0.15 at 250 line pairs. The lens has good contrast.

[0089] Figure 6 is the lens point diagram. Figure 6 It can be seen that the diameter of the central field of view point diagram is less than 2.2um, and the diameter of the edge field of view point diagram is less than 2.3um. The lens has a higher resolution.

[0090] Example 3

[0091] The high-pixel, large-aperture, all-glass motion DV lens provided in this embodiment is as follows: Figure 7 The optical system structure of the motion DV lens provided in this embodiment achieves the following optical indicators:

[0092] Focal length: f' = 2.61 mm;

[0093] Relative aperture: F = 2.4;

[0094] Field of view: 2w = 150° (matching 1 / 3-inch 13-megapixel image sensor);

[0095] The total length of the optical path is less than 22.5mm;

[0096] Applicable spectral range: 450-700nm.

[0097] The parameters of the first to sixth lenses are shown in the following table:

[0098]

[0099] Wherein, R is the center radius of the lens surface, D is the distance from the corresponding optical surface to the next optical surface on the optical axis, nd corresponds to the refractive index of d light (wavelength 587nm); S1 and S2 are the object surface and image surface of the first lens, S3 and S4 are the object surface and image surface of the second lens, S5 and S6 are the object surface and image surface of the third lens, Stop surface is the surface where the aperture is located, S7 and S8 are the object surface and image surface of the fourth lens, S8 and S9 are the object surface and image surface of the fifth lens, S10 and S11 are the object surface and image surface of the sixth lens.

[0100] Figure 8 is the MTF curve of the lens. Figure 8 It can be seen that the center field of view is greater than 0.2 at 450 line pairs, and the edge field of view is greater than 0.15 at 250 line pairs. The lens has good contrast.

[0101] Fig. 9 is the lens point diagram. Fig. 9 It can be seen that the diameter of the central field of view point diagram is less than 2.1um, and the diameter of the edge field of view point diagram is less than 2.4um. The lens has a higher resolution.

[0102] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A high-pixel, large-aperture, all-glass sports DV lens, characterized in that: The motion DV lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side along the optical axis; the first lens is a convex-concave negative power lens, the second lens is a biconcave negative power lens, the third lens is a biconvex positive power lens, the fourth lens is a biconvex positive power lens, the fifth lens is a concave-convex negative power lens, and the sixth lens is a biconvex positive power lens; the fourth lens and the fifth lens are glued together to form a glued lens, and the glued lens and the entire lens meet the following conditional formula: 5.5<|f e / f|<6.5; Among them, f e is the focal length of the doublet lens.

2. The high-pixel, large-aperture, all-glass sports DV lens according to claim 1, characterized in that: The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses.

3. The high-pixel, large-aperture, all-glass sports DV lens according to claim 1, characterized in that: The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively satisfy the following conditional formula with the entire lens: 2.0<|f1 / f|<6.0; 1.0<|f2 / f|<4.0; 1.7<|f3 / f|<5.5; 0.5<|f4 / f|<3.5; 1.0<|f5 / f|<4.0; 2.5<|f6 / f|<7.0; Among them, f is the focal length of the entire lens, and f1, f2, f3, f4, f5 and f6 correspond to the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively.

4. The high-pixel, large-aperture, all-glass sports DV lens according to claim 1, characterized in that: The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively satisfy the following conditional formula with the entire lens: 3.4<|f1 / f|<3.9; 2.0<|f2 / f|<2.2; 2.35<|f3 / f|<2.6; 1.3<|f4 / f|<1.5; 1.8<|f5 / f|<2.1; 3.9<|f6 / f|<4.3; Among them, f is the focal length of the entire lens, and f1, f2, f3, f4, f5 and f6 correspond to the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively.

5. The high-pixel, large-aperture, all-glass sports DV lens according to claim 1, characterized in that: The focal length, refractive index and curvature radius of the first to sixth lenses meet the following conditions: Among them, "f" is the focal length, "n" is the refractive index, "R" is the radius of curvature, and the "-" sign indicates that the direction is negative; Among them, f1 to f6 correspond to the focal lengths of the first to sixth lenses respectively; n1 to n6 correspond to the refractive indices of the first to sixth lenses respectively; R1, R3, R5, R7, R9, and R11 correspond to the curvature radii of the first to sixth lenses close to the object side respectively, and R2, R4, R6, R8, R10, and R12 correspond to the curvature radii of the first to sixth lenses away from the object side respectively.

6. The high-pixel, large-aperture, all-glass sports DV lens according to claim 1, characterized in that: The focal length, refractive index and curvature radius of the first to sixth lenses meet the following conditions: Among them, "f" is the focal length, "n" is the refractive index, "R" is the radius of curvature, and the "-" sign indicates that the direction is negative; Among them, f1 to f6 correspond to the focal lengths of the first to sixth lenses respectively; n1 to n6 correspond to the refractive indices of the first to sixth lenses respectively; R1, R3, R5, R7, R9, and R11 correspond to the curvature radii of the first to sixth lenses close to the object side respectively, and R2, R4, R6, R8, R10, and R12 correspond to the curvature radii of the first to sixth lenses away from the object side respectively.

7. The high-pixel, large-aperture, all-glass sports DV lens according to claim 1, characterized in that: The total length of the sports DV lens is less than 22.5 mm, the field of view angle is greater than 150° and it is matched with a 1 / 3 inch image sensor.

Images