阅读说明：本技术 一种高分辨率大光圈运动dv镜头 (High-resolution large-aperture motion DV lens ) 是由 王杰 龚昭宇 余飞鸿 付金姣 潘美玉 于 2019-10-16 设计创作，主要内容包括：本发明公开了一种高分辨率大光圈运动DV镜头,所述运动DV镜头包括沿光轴从物方至像方依次排列的第一透镜、第二透镜、第三透镜、第四透镜、第五透镜和第六透镜,所述第一透镜是凸凹负光焦度透镜,所述第二透镜是凹凸负光焦度透镜,所述第三透镜是凸凹正光焦度透镜,所述第四透镜是双凸正光焦度透镜,所述第五透镜为平凹负光焦度透镜,所述第六透镜为凸凹正光焦度透镜。本发明提供的高分辨率大光圈运动DV镜头最高可以实现了1200万像素分辨率、F2.0光圈和匹配1/2.7英寸图像传感器。(The invention discloses a high-resolution large-aperture motion DV lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the first lens is a convex-concave negative focal power lens, the second lens is a convex-concave negative focal power lens, the third lens is a convex-concave positive focal power lens, the fourth lens is a double-convex positive focal power lens, the fifth lens is a plano-concave negative focal power lens, and the sixth lens is a convex-concave positive focal power lens. The high-resolution large-aperture motion DV lens provided by the invention can realize the maximum 1200 ten thousand pixel resolution, F2.0 aperture and 1/2.7-inch matched image sensor.)

1. The DV lens for the high-resolution large-aperture sports is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the first lens is a convex-concave negative focal power lens, the second lens is a convex-concave negative focal power lens, the third lens is a convex-concave positive focal power lens, the fourth lens is a double-convex positive focal power lens, the fifth lens is a plano-concave negative focal power lens, and the sixth lens is a convex-concave positive focal power lens.

2. The high resolution large aperture motion DV lens according to claim 1, wherein said first, third, fourth and fifth lenses are glass spherical lenses and said second and sixth lenses are plastic aspherical lenses.

3. The high-resolution large-aperture motion DV lens according to claim 1 or 2, wherein the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens and the focal length of the motion DV lens respectively satisfy the following conditional expressions:

0.5<|f1/f|<5

8.5<|f2/f|<15

0.5<|f3/f|<5

1<|f4/f|<5.5

0.5<|f5/f|<4.5

15<|f6/f|<30

where f is the focal length of the motion DV 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-resolution large-aperture motion DV lens according to claim 1 or 2, wherein the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens and the focal length of the whole motion DV lens respectively satisfy the following conditional expressions:

2.4<|f1/f|<3

8.5<|f2/f|<14.3

2.8<|f3/f|<3.1

1.2<|f4/f|<1.35

1.2<|f5/f|<1.65

15<|f6/f|<25

where f is the focal length of the motion DV 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-resolution large-aperture motion DV lens according to claim 1 or 2, wherein the fourth lens and the fifth lens are glued to form a cemented lens, and the cemented lens and the motion DV lens satisfy the following conditional expression:

0.5<|f_e/f|<10

wherein f is_eIs the focal length of the cemented lens.

The double-gluing plays a role in converging light beams and correcting chromatic aberration. The sixth lens (aspherical surface) after the cemented lens assumes the function of correcting the aberration of the off-axis light beam.

6. The high-resolution large-aperture motion DV lens according to claim 1 or 2, wherein the focal length, refractive index, and radius of curvature of the first to sixth lenses satisfy the following conditions:

wherein "f" is the focal length, "n" is the refractive index, "R" is the radius of curvature, and the "-" number indicates that the direction is negative; f1 to f6 correspond to focal lengths of the first to sixth lenses, respectively; n1 to n6 correspond to refractive indices of the first to sixth lenses, respectively; r1, R3, R5, R7, R9 and R11 correspond to radii of curvature of the first to sixth lenses on the side closer to the object side, and R2, R4, R6, R8, R10 and R12 correspond to radii of curvature of the first to sixth lenses on the side farther from the object side.

7. The high-resolution large-aperture motion DV lens according to claim 1 or 2, characterized in that, preferably, the focal length, refractive index and radius of curvature of the first to sixth lenses satisfy the following conditions:

-7.5<f1<-6.4 1.78<n1<1.9 15≤R1≤25 4.1≤R2≤4.5 -39<f2<-21 1.6≤n2<1.65 -6.3<R3<-5.5 -12<R4<-9 7.5<f3<7.8 1.87<n3<1.95 5.8<R5≤6.2 32<R6≤42 3<f4<3.65 1.7≤n4≤1.79 5.5≤R7≤6.2 -4.1≤R8<-3.7 -4.5<f5<-3.2 1.93<n5<1.95 -4.1≤R9<-3.7 R10＝∞ 38<f6<68 1.6≤n6<1.65 5.9<R11<7.5 6.5<R12≤9.5

wherein "f" is the focal length, "n" is the refractive index, "R" is the radius of curvature, and the "-" number indicates that the direction is negative; f1 to f6 correspond to focal lengths of the first to sixth lenses, respectively; n1 to n6 correspond to refractive indices of the first to sixth lenses, respectively; r1, R3, R5, R7, R9 and R11 correspond to radii of curvature of the first to sixth lenses on the side closer to the object side, and R2, R4, R6, R8, R10 and R12 correspond to radii of curvature of the first to sixth lenses on the side farther from the object side.

8. The high resolution large aperture motion DV lens according to any of claims 1-7, wherein said motion DV lens has an overall length of less than 22.8mm, a field angle of greater than 165 °, and matches a 1/2.7 inch image sensor.

Technical Field

The invention belongs to the technical field of optical lenses, and particularly relates to a high-resolution large-aperture motion DV lens.

Background

With the development of optical design and image sensing technology, the variety of optical lenses is increasing, and the application range is also wider. In addition to being applied to conventional photographic camera systems, optical lenses are also beginning to be applied to various video capture systems. With the rise of various extreme sports, sports cameras have been developed vigorously in recent years, and in order to meet the requirements of extreme sports shooting and recording, sports DV lenses need to have high pixels and large apertures.

At present, most of motion DV lenses in the market only meet the pixel resolution of 500-800 million, the F number of the lenses is more than 2.5, the lens is designed to be of a structure with 6 or 7 glass spherical lenses, and the characteristic that the glass spherical lenses are easy to process is fully exerted. The chinese patent publication No. CN106772947A discloses a large-phase motion DV lens, which includes 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 an object side to an image side, wherein the first lens is a convex-concave negative-power glass spherical lens, the second lens is a biconcave negative-power glass spherical lens, the third lens is a biconvex positive-power glass spherical lens, the fourth lens is a biconvex positive-power glass spherical lens, and the fifth lens is a biconcave negative-power glass spherical lens; the sixth lens is a plano-convex positive focal power glass spherical lens, and the seventh lens is a double-convex positive focal power glass spherical lens. The chinese patent document with publication number CN207586520 discloses a motion DV optical lens, which is sequentially provided with 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 from outside to inside, wherein 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 external diameter of first sphere convex lens is 15.5mm, second sphere convex lens with the external diameter of third sphere concave lens is 8mm, fourth sphere concave lens with fifth sphere convex lens passes through glue and links together, sixth sphere convex lens with second sphere convex lens looks butt.

However, the motion DV lens in the current market generally has the disadvantages of low resolution and small aperture. Under the condition of severe outdoor environment, the lens aperture is small, so that longer exposure time is needed when an image is captured, and the requirement of the extreme sport enthusiasts for snapshot cannot be well met; the lower resolution results in a captured image and recorded video with less detail rendering capabilities.

It can be seen that there are almost no motion DV lenses on the market today that can achieve a resolution of 1200 thousand pixels, an F2.0 aperture, and match a 1/2.7 inch image sensor. Therefore, a motion DV lens with 1200 ten thousand pixels, F2.0 aperture, and matching 1/2.7 inch image sensor is needed to fill the market vacancy.

Disclosure of Invention

The invention aims to provide a high-resolution large-aperture motion DV lens, which realizes 1200 ten thousand pixel resolution, an F2.0 aperture and a matched 1/2.7-inch image sensor.

The technical scheme adopted by the invention is as follows:

a high-resolution large-aperture motion DV lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the first lens is a convex-concave negative focal power lens, the second lens is a convex-concave negative focal power lens, the third lens is a convex-concave positive focal power lens, the fourth lens is a double-convex positive focal power lens, the fifth lens is a plano-concave negative focal power lens, and the sixth lens is a convex-concave positive focal power lens.

The first lens, the third lens, the fourth lens and the fifth lens are glass spherical lenses, and the second lens and the sixth lens are plastic aspheric lenses. The plastic aspheric lens has higher aberration correction capability, the number of the glass spherical lenses is effectively reduced by using the plastic aspheric lens, the structure of the optical lens is simplified, and the weight of the optical lens is reduced. The lens is designed by adopting a mode of mixing a plastic non-spherical lens and a glass spherical lens, and the obtained result has good imaging quality and lower cost.

The focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens and the focal length of the motion DV lens respectively satisfy the following conditional expressions:

0.5<|f1/f|<5

8.5<|f2/f|<15

0.5<|f3/f|<5

1<|f4/f|<5.5

0.5<|f5/f|<4.5

15<|f6/f|<30

where f is the focal length of the motion DV 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.

Preferably, the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens and the focal length of the entire motion DV lens satisfy the following conditional expressions:

2.4<|f1/f|<3

8.5<|f2/f|<14.3

2.8<|f3/f|<3.1

1.2<|f4/f|<1.35

1.2<|f5/f|<1.65

15<|f6/f|<25

where f is the focal length of the motion DV 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. Optimization within this range yields a resulting MTF curve closer to the diffraction limit and smaller stipple size.

Preferably, the fourth lens and the fifth lens are cemented to form a cemented lens, and the cemented lens and the motion DV lens satisfy the following conditional expression:

0.5<|f_e/f|<10

wherein f is_eIs the focal length of the cemented lens.

The cemented lens plays the roles of converging light beams and correcting chromatic aberration. The sixth lens (aspherical surface) after the cemented lens assumes the function of correcting the aberration of the off-axis light beam.

The focal length, refractive index and radius of curvature of the first to sixth lenses satisfy the following conditions:

-10<f1<-5	1.65<n1<1.9	10<R1<30	3.5<R2<5.5
				-40.5<f2<-20	1.5<n2<1.75	-6.5<R3<-4.5	-15<R4<-5
5<f3<9.5	1.75<n3<1.95	5<R5<7	30<R6<50
				3<f4<5	1.6<n4<1.8	5<R7<7	-5<R8<-3
-5<f5<-2.5	1.85<n5<2.05	-5<R9<-3	R10＝∞
				35<f6<70	1.5<n6<1.75	5<R11<7.5	6<R12<10

wherein "f" is the focal length, "n" is the refractive index, "R" is the radius of curvature, and the "-" number indicates that the direction is negative; f1 to f6 correspond to focal lengths of the first to sixth lenses, respectively; n1 to n6 correspond to refractive indices of the first to sixth lenses, respectively; r1, R3, R5, R7, R9 and R11 correspond to radii of curvature of the first to sixth lenses on the side closer to the object side, and R2, R4, R6, R8, R10 and R12 correspond to radii of curvature of the first to sixth lenses on the side farther from the object side.

Preferably, the focal length, refractive index, and radius of curvature of the first to sixth lenses satisfy the following conditions:

-7.5<f1<-6.4	1.78<n1<1.9	15≤R1≤25	4.1≤R2≤4.5
				-39<f2<-21	1.6≤n2<1.65	-6.3<R3<-5.5	-12<R4<-9
7.5<f3<7.8	1.87<n3<1.95	5.8<R5≤6.2	32<R6≤42
				3<f4<3.65	1.7≤n4≤1.79	5.5≤R7≤6.2	-4.1≤R8<-3.7
-4.5<f5<-3.2	1.93<n5<1.95	-4.1≤R9<-3.7	R10＝∞
				38<f6<68	1.6≤n6<1.65	5.9<R11<7.5	6.5<R12≤9.5

wherein "f" is the focal length, "n" is the refractive index, "R" is the radius of curvature, and the "-" number indicates that the direction is negative; f1 to f6 correspond to focal lengths of the first to sixth lenses, respectively; n1 to n6 correspond to refractive indices of the first to sixth lenses, respectively; r1, R3, R5, R7, R9 and R11 correspond to radii of curvature of the first to sixth lenses on the side closer to the object side, and R2, R4, R6, R8, R10 and R12 correspond to radii of curvature of the first to sixth lenses on the side farther from the object side. Optimization within this range yields a resulting MTF curve closer to the diffraction limit and smaller stipple size.

The overall length of the motion DV lens is less than 22.8mm, the field angle is larger than 165 degrees, and the motion DV lens is matched with a 1/2.7 inch image sensor.

Due to the limitation of the total length of the current motion DV lens, more lenses are required when the glass spherical lenses are adopted to realize the design requirements of 1200 ten thousand pixels, F2.0 aperture and 1/2.7 inch image sensor matching, so that the optical lens is heavier and the production cost of the optical lens is higher. The invention uses 4 glass spherical lenses and 2 plastic non-spherical lenses to form a 6-piece optical structure, and can maximally realize the maximum aperture of 1200 ten thousand pixels and F2.0 by reasonably arranging the lenses and selecting optical materials, match with a 1/2.7 inch image sensor, and have the total length less than 22.8mm, the field angle greater than 165 degrees and other indexes. The defects that the existing motion DV lens in the market is low in resolution and small in aperture are overcome. Even under the comparatively abominable condition of outdoor environment, required exposure time is shorter when shooing the image, satisfies the demand that extreme motion fan took a candid photograph, and the picture of shooing and the video resolution ratio of recording are higher, and detail performance ability is better.

Drawings

Fig. 1 is a schematic structural diagram of an optical system of a high-resolution large-aperture motion DV lens in embodiment 1;

fig. 2 is a graph of MTF of the high-resolution large-aperture motion DV lens in embodiment 1;

fig. 3 is a dot-column diagram of a high-resolution large-aperture motion DV lens in embodiment 1;

FIG. 4 is a schematic view of an optical system of a high-resolution large-aperture motion DV lens according to embodiment 2;

fig. 5 is a graph of MTF of the high-resolution large-aperture motion DV lens in embodiment 2;

FIG. 6 is a dot-column diagram graph of a high-resolution large-aperture motion DV lens in embodiment 2;

fig. 7 is a schematic structural view of an optical system of a high-resolution large-aperture motion DV lens according to embodiment 3;

fig. 8 is an MTF graph of a high-resolution large-aperture motion DV lens in embodiment 3;

fig. 9 is a dot-sequence chart graph of the high-resolution large-aperture motion DV lens in embodiment 3.

Detailed Description

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

As shown in fig. 1, the DV lens with high resolution and large aperture movement provided by the present invention includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6 and an optical filter, which are arranged in sequence from an object side to an image side along an optical axis; the first lens 1 is a convex-concave negative focal power lens, the second lens 2 is a convex-concave negative focal power lens, the third lens 3 is a convex-concave positive focal power lens, the fourth lens 4 is a double convex positive focal power lens, the fifth lens 5 is a plano-concave negative focal power lens, and the sixth lens 6 is a convex-concave positive focal power lens; the first lens 1, the third lens 3, the fourth lens 4 and the fifth lens 5 are glass spherical lenses, and the second lens 2 and the sixth lens 6 are plastic aspheric lenses; the fourth lens 4 is cemented with the fifth lens 5 to form a cemented lens.

The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 and the motion DV lens satisfy the following conditional expressions:

2.4<|f1/f|<3

8.5<|f2/f|<14.3

2.8<|f3/f|<3.1

1.2<|f4/f|<1.35

1.2<|f5/f|<1.65

15<|f6/f|<25

where f is the focal length of the moving DV lens, and f1, f2, f3, f4, f5, and f6 correspond to the focal lengths of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, and the sixth lens 6, respectively.

The cemented lens and the whole lens satisfy the following conditional expressions:

0.5<|f_e/f|<10

wherein f is_eIs the focal length of the cemented lens.