CN107632372B - Periscope type double-path fisheye panoramic system capable of focusing - Google Patents
Periscope type double-path fisheye panoramic system capable of focusing Download PDFInfo
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- CN107632372B CN107632372B CN201711004533.7A CN201711004533A CN107632372B CN 107632372 B CN107632372 B CN 107632372B CN 201711004533 A CN201711004533 A CN 201711004533A CN 107632372 B CN107632372 B CN 107632372B
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Abstract
The invention provides a periscope type double-path fisheye panoramic system capable of focusing, which comprises a lens barrel, wherein two lenses are symmetrically arranged in the lens barrel. The lens sequentially comprises a focusing lens group, a reflecting element and a fixed lens group along an optical axis from an object side to an image side, wherein the optical axis comprises a first optical axis and a second optical axis which is not overlapped with the first optical axis, and the first optical axis and the second optical axis form an intersection point on a reflecting surface of the reflecting element; the focusing lens group comprises at least two lenses which are arranged along a first optical axis from an object space to an image space, and the focusing lens group and the fixed lens group meet the following conditional expression: 0.2< |ff/gf| <1.3, where Ff is the focal length of the focusing lens group and Gf is the focal length of the fixed lens group. The lens can reach an ultra-large angle with 4K resolution and 206 degrees, and has the advantages of f theta distortion of less than 9%, good imaging quality, easy focusing, difficult focus running and the like; the sum of the angles of the two lens visual angles is larger than 360 degrees, so that panoramic image acquisition is achieved.
Description
Technical Field
The invention relates to the technical field of image acquisition, in particular to a periscope type double-path fisheye panoramic system capable of focusing.
Background
With the improvement of image processing capability, a stream of panoramic shooting climax is gradually raised in the consumer market. The term "panoramic" is understood to mean that a scene is viewable in all directions up and down, left and right, and front and back. However, to achieve such a large angle, it is not possible to rely on only one lens. It is therefore necessary to address this problem by taking hand from the image stitching, and panoramic systems require lenses ranging from 2 to more than ten. The scheme of image stitching by using the two-way fisheye lens is the simplest and most feasible.
Most of the current double-light-path fisheye panoramic systems are composed of 2 sensors and 2 fisheye lenses. The principle is that the images of the two fish-eye cameras are spliced together, and the scheme has the advantage that the design of the whole hardware scheme is simpler. However, the two circuits are required to have high synchronism, the rear-end software is difficult to process, the problems of incomplete pictures and the like are easy to occur, meanwhile, the width of two ends of the large-sized circuit can reach 60mm, and the large-sized circuit is inconvenient to carry, so that the market popularization is greatly limited. The fisheye lens adopts periscope type structure, the refraction or reflection prism is utilized to deflect the light path by 90 degrees from the middle, and the two lenses are symmetrically imaged in 1 sensor side by side. The structure has the advantages of good synchronism, small volume and the like. But such deflected optical systems have not been able to use conventional threaded interfaces to directly twist the entire lens to focus. At present, an adjusting mechanism is added between a lens image side and a sensor to achieve the purpose of focusing by adjusting the distance between a lens and the sensor, and the method is complex in structure, low in precision and still a feasible focusing scheme for a single periscope lens. However, for the periscope type fish-eye lens with double light paths, as 2 optical lenses are placed side by side, the focusing scheme needs to have high consistency of optical back focus of the two lenses, and once the optical back focus of the two lenses which are juxtaposed are inconsistent, a clear and blurred result of half images can occur. Thus, there is a great difficulty in processing and machining the lens, so that mass production of the lens on the market is difficult and still immature.
Disclosure of Invention
The invention provides a periscope type double-path fisheye panoramic system capable of focusing, which solves the technical problems of the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an optical imaging lens sequentially comprises a focusing lens group, a reflecting element and a fixed lens group from an object side to an image side along an optical axis, wherein the optical axis comprises a first optical axis and a second optical axis which is not coincident with the first optical axis, and the first optical axis and the second optical axis form an intersection point on a reflecting surface of the reflecting element; the focusing lens group comprises at least two lenses which are arranged along a first optical axis from an object space to an image space, and the focusing lens group and the fixed lens group meet the following conditional expression:
0.2< |ff/gf| <1.3, where Ff is the focal length of the focusing lens group and Gf is the focal length of the fixed lens group.
Further, the focusing lens group includes a first lens and a second lens arranged along a first optical axis from an object side to an image side, the fixed lens group includes a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged along a second optical axis from the object side to the image side, and the second lens, the fourth lens, the fifth lens, and the sixth lens respectively satisfy the conditional expressions with the entire lens:
3<∣f2/f∣<7.5，
5.1<∣f4/f∣<14.8，
0.8<∣f5/f∣<4.5，
1.3< |f6/f| <4.8, where f is the focal length of the entire lens, and f2, f4, f5, f6 are the focal lengths of the second lens, fourth lens, fifth lens, and sixth lens, respectively.
Further, the second lens, the fourth lens, the fifth lens and the sixth lens are all aspheric lenses.
Further, the first optical axis is 45 degrees to the reflecting surface of the reflecting element, and the first optical axis and the second optical axis are perpendicular to each other.
Preferably, the first lens is a convex-concave negative power lens, the second lens is a negative power lens, an image side surface thereof is a convex surface, and an object side surface thereof is one of a convex surface, a concave surface and a plane.
Preferably, the third lens is a positive focal power lens, the image side surface of the third lens is a convex surface, and the object side surface is one of a convex surface, a concave surface and a plane; the fourth lens is a negative focal power lens, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is one of a convex surface, a concave surface and a plane; the fifth lens is a biconvex positive focal power lens; the sixth lens is a biconcave negative focal power lens; the seventh lens is a biconvex positive power lens.
A periscope type double-path fisheye panoramic system capable of focusing comprises a lens barrel, wherein two lenses are symmetrically arranged in two ends of the lens barrel.
Further, the lens barrel comprises a base, the fixed lens group is arranged on the base, and an imaging chip for imaging is arranged on one side of an image side of the fixed lens group.
Further, the lens cone comprises an upper lens holder, a flat bottom is arranged on the upper lens holder, the reflecting element is arranged on the flat bottom, the reflecting element is a right-angle prism, the right-angle prism is shared by two lenses, and the two side surfaces of the right-angle prism are respectively plated with a total reflection film to serve as reflection surfaces.
Preferably, the focusing lens group is connected with the lens barrel through rotary threads, and the lens barrel is rotated during focusing, so that a proper distance is formed between the focusing lens group and the reflecting element on the optical axis.
The invention provides a periscope type two-way fisheye panoramic system capable of focusing, which symmetrically adopts lenses of 1 focusing lens group and 1 fixed lens group at two ends of a lens barrel, wherein each lens comprises 3 glass spherical lenses and 4 plastic aspherical lenses. The lens fully combines and plays the advantages of easy processing of the glass lens, high performance, good consistency and light weight of the plastic aspheric lens, so that the volume and the weight of the lens are greatly reduced. The lens is easy to focus by adopting the two-group structure, the focal length of the lens is hardly changed in the focusing process, and meanwhile, the lens can be used in an environment of-30 to +80 degrees without running focus, so that the problem of mass production is solved, and the processing difficulty of the whole lens is greatly reduced. The ultra-large angle of 206 degrees of a single lens can be achieved by adopting 3 glass spherical lenses and 4 plastic aspheric lenses together for 7 lenses, the fΘ distortion is less than 9%, the 4K ultra-high definition resolution is achieved, the total length of two ends is less than 30mm, and the ultra-large angle lens has high market value. The sum of the angles of the two lens visual angles is larger than 360 degrees, so that panoramic image acquisition is achieved.
When the panoramic system images, light enters from the focusing lens groups of the two lenses, is totally reflected to the fixed lens group through the right-angle prism, images on the imaging chip at the same time, and the back focus of the two lenses is unchanged, so that the imaging quality is very high.
Drawings
Fig. 1 is an optical structure schematic diagram of a periscope type two-way fisheye panorama system with adjustable focusing.
Detailed Description
Embodiments of the present invention will now be described in detail with reference to the drawings, which are intended to be used as references and illustrations only, and are not intended to limit the scope of the invention.
As shown in fig. 1, an optical imaging lens sequentially includes, from an object side to an image side, a focusing lens group, a reflecting element 8, and a fixed lens group along an optical axis, where the optical axis includes a first optical axis and a second optical axis that is not coincident with the first optical axis, and the first optical axis and the second optical axis form an intersection point on a reflecting surface of the reflecting element 8; the focusing lens group comprises at least two lenses which are arranged along a first optical axis from an object space to an image space, and the focusing lens group and the fixed lens group meet the following conditional expression:
0.2< |ff/gf| <1.3, where Ff is the focal length of the focusing lens group and Gf is the focal length of the fixed lens group.
In this embodiment, the focusing lens group includes a first lens 1 and a second lens 2 arranged along a first optical axis from an object side to an image side, the fixed lens group includes a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7 arranged along a second optical axis from the object side to the image side, and the second lens 2, the fourth lens 4, the fifth lens 5, and the sixth lens 6 satisfy the following conditional expressions with the entire lens, respectively:
3<∣f2/f∣<7.5，
5.1<∣f4/f∣<14.8，
0.8<∣f5/f∣<4.5，
1.3< |f6/f| <4.8, where f is the focal length of the entire lens and f2, f4, f5, f6 are the focal lengths of the second lens 2, fourth lens 4, fifth lens 5, and sixth lens 6, respectively.
In a preferred embodiment, the first optical axis is 45 ° with respect to the reflecting surface of the reflecting element 8, and the first optical axis is perpendicular to the second optical axis.
Specifically, the first lens 1 is a convex-concave negative power lens, the second lens 2 is a negative power lens, the image side surface thereof is a convex surface, and the object side surface thereof is one of a convex surface, a concave surface and a plane. The third lens 3 is a positive focal power lens, the image side surface of the third lens is a convex surface, and the object side surface is one of a convex surface, a concave surface and a plane; the fourth lens 4 is a negative focal power lens, the object side surface of the fourth lens is a concave surface, and the image side surface is one of a convex surface, a concave surface and a plane; the fifth lens 5 is a biconvex positive power lens; the sixth lens 6 is a biconcave negative focal power lens; the seventh lens 7 is a biconvex positive power lens. Specific parameters of refractive index and focal length of each lens are as follows:
| f1＝-20.8～-4.9 | n1＝1.6～1.95 |
| f2＝-12.5～-2.1 | n2＝1.43～1.75 |
| f3＝3.8～15.9 | n3＝1.75～2.15 |
| f4＝-20.1～-4.3 | n4＝1.43～1.8 |
| f5＝1.1～5.8 | n5＝1.43～1.75 |
| f6＝-6.5～-1.2 | n6＝1.43～1.85 |
| f7＝2.9～12.2 | n7＝1.43～1.65 |
| f6＝-6.5～-1.2 | n6＝1.43～1.85 |
| f7＝2.9～12.2 | n7＝1.43～1.65 |
wherein f1 to f7 sequentially represent lens focal lengths of the first lens to the seventh lens, respectively; n1 to n7 represent refractive indices of the first lens to the seventh lens, respectively, in this order.
In a preferred embodiment, the second lens 2, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are all aspheric lenses. Their respective lens mirror shapes satisfy the following equation:
wherein r represents radial coordinates, the unit is the same as the length unit of the lens, c is the curvature corresponding to the surface center radius, k is the conic coefficient, and alpha 1 To alpha 8 Is a higher order aspheric coefficient.
The aspherical coefficients satisfying the above aspherical equation in the present embodiment are as follows:
| S3 | S4 | S8 | S9 | S10 | S11 | S12 | S13 | |
| α1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| α2 | -4.20E-04 | -1.40E-03 | 4.38E-03 | -4.58E-03 | -8.12E-03 | 5.12E-05 | 3.40E-03 | 0.032 |
| α3 | -7.13E-04 | 5.88E-03 | 5.31E-03 | 9.19E-04 | 1.77E-03 | 8.11E-04 | 2.07E-03 | -8.72E-03 |
| α4 | -5.04E-04 | -4.89E-03 | -1.95E-03 | -1.83E-04 | 1.67E-04 | 5.36E-05 | 5.37E-03 | -6.32E-03 |
| α5 | 3.33E-04 | 2.35E-03 | -2.26E-03 | -3.71E-05 | 2.69E-06 | -3.09E-05 | 3.17E-03 | 0.013 |
| α6 | -8.61E-05 | -3.52E-04 | 1.70E-03 | 4.34E-05 | -1.92E-05 | 2.31E-05 | -1.27E-03 | -6.02E-03 |
| α7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| α8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
in this embodiment, the physical optical parameters of the lens are as follows:
| face number | Surface type | R | D | nd | K value |
| S1 | Spherical surface | 23.61 | 2.75 | 1.77 | |
| S2 | Spherical surface | 5.58 | 3.93 | ||
| S3 | Aspherical surface | -247.2 | 1.55 | 1.55 | -189.3 |
| S4 | Aspherical surface | 2.88 | 5.73 (variable spacing) | -6.15 | |
| S5 | Reflective surface | Plane surface | 3.44 | ||
| S6 | Spherical surface | 33.74 | 1.17 | 2.1 | |
| S7 | Spherical surface | -12.21 | 0.55 | ||
| Diaphragm | Plane surface | Plane surface | 0.74 | ||
| S8 | Aspherical surface | -5.44 | 1.27 | 1.64 | 8.12 |
| S9 | Aspherical surface | -85.33 | 0.05 | -105.4 | |
| S10 | Aspherical surface | 2.63 | 1 | 1.54 | -2.52 |
| S11 | Aspherical surface | -2.39 | 0.05 | -0.17 | |
| S12 | Aspherical surface | -3.68 | 0.47 | 1.64 | -10.47 |
| S13 | Aspherical surface | 3.91 | 0.41 | 4.22 | |
| S14 | Spherical surface | 8.11 | 0.93 | 1.44 | |
| S15 | Spherical surface | -4.48 | |||
| S16 | Image plane | Plane surface |
Wherein R is the radius of the center of the surface, D is the distance between the corresponding optical surface and the next optical surface on the optical axis; nd corresponds to the refractive index of d light (wavelength 587 nm); s1 and S2 are the object side surface and the image side surface of the first lens 1, S3 and S4 are the object side surface and the image side surface of the second lens 2, S5 represents the radiation surface of the reflecting element, S6 and S7 are the object side surface and the image side surface of the third lens 3, and the diaphragm is the plane where the diaphragm is located; s8 and S9 are the object side surface and the image side surface of the fourth lens 4; s10 and S11 are an object side surface and an image side surface of the fifth lens 5; s12 and S13 are an object side surface and an image side surface of the sixth lens 6; s14 and S15 are the object side surface and the image side surface of the seventh lens 7; s16 is the plane of the imaging chip.
A periscope type double-path fisheye panoramic system capable of focusing comprises a lens barrel, wherein two lenses are symmetrically arranged in two ends of the lens barrel. The lens barrel comprises a base 12, the fixed lens group is arranged on the base 12, and an imaging chip 13 for imaging is arranged on one side of the image side of the fixed lens group. During imaging, the two lenses respectively acquire the external scenery and focus and image the scenery to the same imaging chip through the lenses, and the back focus of the two lenses is fixed and images the scenery on the same imaging chip at the same time, so that the synchronism of images formed by the two lenses is very good, and the imaging quality is high.
The lens cone comprises an upper lens frame 11, a flat bottom is arranged on the upper lens frame 11, the reflecting element 8 is arranged on the flat bottom, the reflecting element 8 is a right-angle prism, two lenses share the right-angle prism, and the two side surfaces of the right-angle prism are respectively plated with a total reflection film to serve as reflection surfaces. The right-angle prism has very high symmetry and can meet the requirement of high-quality imaging.
The focusing lens group is connected with the lens barrel through a rotary thread, and the lens barrel is rotated during focusing, so that a proper distance is formed between the focusing lens group and the reflecting element 8 on the optical axis, namely, the distance from the image side surface of the second lens to the side reflecting surface of the right-angle prism on the optical axis can be changed along with the focusing process, and when the best focusing effect is achieved, the proper distance is achieved.
When the lenses are assembled, the first lens 1 is directly abutted against the second lens 2, the third lens 3 is abutted against the fourth lens 4 through a spacer, the fourth lens 3 is abutted against the fifth lens 4 through a spacer, the fifth lens 5 is abutted against the sixth lens 6 through a spacer, and the sixth lens 6 is abutted against the seventh lens 7 through a spacer.
The above disclosure is illustrative of the preferred embodiments of the present invention and should not be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (9)
1. An optical imaging lens, characterized in that: the lens comprises a focusing lens group, a reflecting element and a fixed lens group in sequence along an optical axis from an object side to an image side, wherein the optical axis comprises a first optical axis and a second optical axis which is not overlapped with the first optical axis, and the first optical axis and the second optical axis form an intersection point on a reflecting surface of the reflecting element; the focusing lens group comprises at least two lenses which are arranged along a first optical axis from an object space to an image space, and the focusing lens group and the fixed lens group meet the following conditional expression:
0.2< |ff/gf| <1.3, where Ff is the focal length of the focusing lens group and Gf is the focal length of the fixed lens group;
the focusing lens group comprises a first lens and a second lens which are arranged along a first optical axis from an object space to an image space, the fixed lens group comprises a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged along a second optical axis from the object space to the image space, and the second lens, the fourth lens, the fifth lens and the sixth lens respectively meet the following conditional expressions with the whole lens:
3<∣f2/f∣<7.5，
5.1<∣f4/f∣<14.8，
0.8<∣f5/f∣<4.5，
1.3< |f6/f| <4.8, where f is the focal length of the entire lens, and f2, f4, f5, f6 are the focal lengths of the second lens, fourth lens, fifth lens, and sixth lens, respectively.
2. The optical imaging lens as claimed in claim 1, wherein: the second lens, the fourth lens, the fifth lens and the sixth lens are all aspheric lenses.
3. The optical imaging lens as claimed in claim 1, wherein: the first optical axis forms 45 degrees with the reflecting surface of the reflecting element, and the first optical axis and the second optical axis are mutually perpendicular.
4. The optical imaging lens as claimed in claim 1, wherein: the first lens is a convex-concave negative focal power lens, the second lens is a negative focal power lens, the image side surface of the second lens is a convex surface, and the object side surface of the second lens is one of a convex surface, a concave surface and a plane.
5. The optical imaging lens as claimed in claim 1, wherein: the third lens is a positive focal power lens, the image side surface of the third lens is a convex surface, and the object side surface of the third lens is one of a convex surface, a concave surface and a plane; the fourth lens is a negative focal power lens, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is one of a convex surface, a concave surface and a plane; the fifth lens is a biconvex positive focal power lens; the sixth lens is a biconcave negative focal power lens; the seventh lens is a biconvex positive power lens.
6. The utility model provides a periscope formula double-circuit fisheye panoramic system of adjustable, includes lens cone, its characterized in that: two lenses according to any one of claims 2-5 are symmetrically arranged in the lens barrel.
7. The focusing periscope type two-way fisheye panorama system according to claim 6, wherein: the lens barrel comprises a base, the fixed lens group is arranged on the base, and an imaging chip for imaging is arranged on one side of an image side of the fixed lens group.
8. The focusing periscope type two-way fisheye panorama system according to claim 7, wherein: the lens cone comprises an upper lens frame, a flat bottom is arranged on the upper lens frame, the reflecting element is arranged on the flat bottom, the reflecting element is a right-angle prism, two lenses share the right-angle prism, and the two side surfaces of the right-angle prism are respectively plated with a total reflection film to serve as a reflection surface.
9. The focusing periscope type two-way fisheye panorama system according to claim 8, wherein: the focusing lens group is connected with the lens barrel through a rotary thread, and the lens barrel is rotated during focusing, so that a proper distance is formed between the focusing lens group and the reflecting element on the optical axis.
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| CN106502038A (en) * | 2016-11-10 | 2017-03-15 | 福建福特科光电股份有限公司 | 720 ° of panoramic shooting systems |
| CN206270646U (en) * | 2016-11-10 | 2017-06-20 | 福建福特科光电股份有限公司 | 720 ° of panoramic shooting systems |
| CN207380324U (en) * | 2017-10-25 | 2018-05-18 | 东莞市宇瞳光学科技股份有限公司 | A kind of optical imaging lens and the panorama system comprising the camera lens |
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