CN110673315B - Lens - Google Patents
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- CN110673315B CN110673315B CN201910980079.1A CN201910980079A CN110673315B CN 110673315 B CN110673315 B CN 110673315B CN 201910980079 A CN201910980079 A CN 201910980079A CN 110673315 B CN110673315 B CN 110673315B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144109—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +--+
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
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- Optics & Photonics (AREA)
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- Lenses (AREA)
Abstract
The invention discloses a lens, because in the embodiment of the invention, four lens groups are arranged in the lens in sequence from an object side to an image side according to a specific sequence, and the lensThe lens group of (1) satisfies: -1.0. ltoreq.f 2/((f)W’*fT’)1/2)≤‑0.5；0.56≤f4/((fW’*fT’)1/2)≤1.16；0.2≤TTL/(BFL*fW') is less than or equal to 0.5; and under the same conditions, the size and the aperture of the target surface of the lens are increased to a certain extent, so that the acquired image resolution is higher, the light transmission amount of the lens can be still ensured under a low-illumination scene, the acquired image quality is better, and the optical total length of the lens is reduced. Therefore, the embodiment of the invention provides the continuous zooming optical imaging lens with the large target surface, the ultra-large aperture and the high resolution.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens.
Background
Along with the development of society, people's safety precaution consciousness is constantly improved, and security protection monitoring industry also obtains high-speed development, and the effect of control performance is also bigger and bigger. The zoom lens has practical design and use in the last century, and with the development of lens design technology, the application occasions of the zoom lens are gradually increased. Nowadays, zoom lenses have been widely used in the fields of civil products, security monitoring, and the like. However, the zoom lens has poorer imaging quality than the common fixed focal length lens, so the use popularity of the zoom lens is not high. Most zoom lenses on the market are simple in structure and small in target surface size, so that the acquired image is low in resolution, the shooting effect is general, and the picture value is low. Most of the apertures of the zoom lenses on the market are small, so that the light transmission of the lenses is less, images obtained under a low-illumination scene are darker, and the image quality is difficult to guarantee. With the advance of high-definition and miniaturization of security protection, a lens is required to achieve higher performance and smaller size. Therefore, it is important to develop a zoom lens with high performance such as small size, large target surface size, large aperture and the like.
Disclosure of Invention
The embodiment of the invention provides a lens, which is used for solving the problems of small target surface size, small aperture and low resolution of the lens in the prior art.
The embodiment of the present invention provides a lens barrel, including a first lens group, a second lens group, a third lens group, a fourth lens group and an image plane, which are sequentially arranged from an object side to an image side;
the positions of the first lens group and the third lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis;
the lens group satisfies the following conditions:
-1.0≤f2/((fW’*fT’)1/2)≤-0.5；
0.56≤f4/((fW’*fT’)1/2)≤1.16；
0.2≤TTL/(BFL*fW’)≤0.5；
wherein f2 is the focal length of the second lens group, f4 is the focal length of the fourth lens group, fW' is the system focal length of the lens in the short-focus state, fT' is a system focal length of the lens in a long focus state, TTL is an optical total length of the lens, and BFL is a distance between a fourth lens group and the imaging surface of the lens in the long focus state.
Further, the first lens group comprises a first sub-lens group and a second positive power lens which are arranged in sequence from the object side to the image side;
the first sub-lens group includes a first negative power lens and a first positive power lens; the curvature radius of the surface of the first negative focal power lens facing the image side is the same as that of the surface of the first positive focal power lens facing the object side;
the first negative power lens comprises a meniscus lens, and the surface of the meniscus lens, which faces the object side, is convex;
the first positive power lens comprises a convex lens, and the surface of the convex lens facing the object side is a convex surface;
the second positive power lens includes a convex lens whose surface facing the object side is convex.
Further, the second lens group includes a second negative power lens, a third negative power lens and a third positive power lens arranged in order from the object side to the image side;
the second negative power lens comprises a biconcave lens;
the third negative power lens comprises a biconcave lens;
the third positive power lens includes a meniscus lens, and a surface thereof facing the object side is convex.
Further, the third lens group includes a fourth positive power lens, a second sub-lens group, and a fifth negative power lens arranged in order from the object side to the image side;
the second sub-lens group comprises a fifth positive focal power lens and a fourth negative focal power lens; the curvature radius of the surface of the fifth positive focal power lens facing the image side is the same as that of the surface of the fourth negative focal power lens facing the object side;
the fourth positive power lens comprises a biconvex lens;
the fifth positive power lens includes a biconvex lens;
the fourth negative power lens comprises a biconcave lens;
the fifth negative power lens includes a meniscus lens.
Further, the fourth lens group includes a sixth positive power lens, a third sub-lens group, a ninth positive power lens and a fourth sub-lens group arranged in order from the object side to the image side;
the third sub-lens group comprises a seventh positive focal power lens, a sixth negative focal power lens and an eighth positive focal power lens; the curvature radius of the surface of the seventh positive power lens facing the image side is the same as that of the surface of the sixth negative power lens facing the object side; the curvature radius of the surface of the sixth negative power lens facing the image side is the same as that of the surface of the eighth positive power lens facing the object side;
the fourth sub-lens group comprises a seventh negative power lens and a tenth positive power lens; the curvature radius of the surface of the seventh negative power lens facing the image side is the same as that of the surface of the tenth positive power lens facing the object side;
the sixth positive power lens includes a biconvex lens;
the seventh positive power lens includes a biconvex lens;
the sixth negative power lens comprises a biconcave lens;
the eighth positive power lens comprises a meniscus lens, and the surface of the meniscus lens facing the object side is a convex surface;
the ninth positive power lens includes a biconvex lens;
the seventh negative power lens comprises a biconcave lens;
the tenth positive power lens includes a double convex lens.
Further, the refractive indexes of the third positive focal power lens, the fourth positive focal power lens, the sixth positive focal power lens and the tenth positive focal power lens are all larger than or equal to 1.9.
Further, the abbe number of the first positive power lens is 70 or more; and the Abbe numbers of the second negative focal power lens, the third negative focal power lens, the fifth positive focal power lens and the seventh positive focal power lens are all more than or equal to 65.
Further, an aperture diaphragm is arranged between the second lens group and the third lens group.
Further, an optical filter is arranged between the fourth lens group and the imaging surface.
Further, a light splitting device is arranged between the fourth lens group and the optical filter;
the light splitting device comprises two prisms, and the joint surfaces of the two prisms are provided with film layers with light splitting functions; the light emergent side of each prism is respectively provided with a corresponding optical filter and an imaging surface;
the light reflected by each joint surface is vertical to an imaging surface for receiving the light.
The embodiment of the present invention provides a lens barrel, including a first lens group, a second lens group, a third lens group, a fourth lens group and an image plane, which are sequentially arranged from an object side to an image side; the positions of the first lens group and the third lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis; the lens group satisfies the following conditions: -1.0. ltoreq.f 2/((fW’*fT’)1/2)≤-0.5；0.56≤f4/((fW’*fT’)1/2)≤1.16；0.2≤TTL/(BFL*fW') is less than or equal to 0.5; wherein f2 is the focal length of the second lens group, f4 is the focal length of the fourth lens group, fW' is the system focal length of the lens in the short-focus state, fT' is a system focal length of the lens in a long focus state, TTL is an optical total length of the lens, and BFL is a distance between a fourth lens group and the imaging surface of the lens in the long focus state.
Since, in the embodiment of the present invention, four lens groups are arranged in order from the object side to the image side in the lens barrel in a specific order, and the lens groups in the lens barrel satisfy: -1.0. ltoreq.f 2/((f)W’*fT’)1/2)≤-0.5；0.56≤f4/((fW’*fT’)1/2)≤1.16；0.2≤TTL/(BFL*fW') is less than or equal to 0.5; and under the same conditions, the size and the aperture of the target surface of the lens are increased to a certain extent, so that the acquired image resolution is higher, the light transmission amount of the lens can be still ensured under a low-illumination scene, the acquired image quality is better, and the optical total length of the lens is reduced. Therefore, the embodiment of the invention provides the continuous zooming optical imaging lens with the large target surface, the ultra-large aperture and the high resolution.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a lens in a short focus state according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a lens in a telephoto state according to an embodiment of the present invention;
fig. 3 is a graph of an optical transfer function (MTF) of a lens provided in embodiment 1 of the present invention in a wide-angle state in a visible light band;
fig. 4 is a graph of an optical transfer function (MTF) of the lens provided in embodiment 1 in a long focus state in a visible light band.
Detailed Description
The present invention will be described in further detail with reference to the attached drawings, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic view of a lens barrel according to embodiment 1 of the present disclosure, the lens barrel including a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, and an image plane N, which are arranged in order from an object side to an image side;
the positions of the first lens group and the third lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis;
the lens group satisfies the following conditions:
-1.0≤f2/((fW’*fT’)1/2)≤-0.5；
0.56≤f4/((fW’*fT’)1/2)≤1.16；
0.2≤TTL/(BFL*fW’)≤0.5；
wherein f2 is the focal length of the second lens group, f4 is the focal length of the fourth lens group, fW' is the system focal length of the lens in the short-focus state, fT' is a system focal length of the lens in a long focus state, TTL is an optical total length of the lens, and BFL is a distance between a fourth lens group and the imaging surface of the lens in the long focus state.
The lens barrel can realize zooming by changing the positions of lens groups, wherein the positions of the first lens group and the third lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis to realize zooming. That is, the second lens group can be moved in a position between the first lens group and the third lens group. The second lens group may be close to the first lens group, far from the third lens group; it may be away from the first lens group and close to the third lens group. The fourth lens group may be moved in a position between the third lens group and the imaging surface. The second lens group is a zoom lens group, and the movement of the second lens group has a large influence on the focal length of the lens. The fourth lens group is a compensation lens group, and fine adjustment of the focal length is realized by movement of the fourth lens group. By disposing the second lens group and the fourth lens group as lens groups movable along the optical axis, zooming and focusing of the lens are achieved.
In the lens system provided by the embodiment of the invention, each lens group has a corresponding focal length f, and the lens system has a corresponding system focal length f in a long-focus stateT', has its corresponding system focal length f in the short focus stateW'. In order to provide a large target surface, ultra-large aperture, high resolution lens, the lens group satisfies the following relation:
-1.0≤f2/((fW’*fT’)1/2)≤-0.5；
0.56≤f4/((fW’*fT’)1/2)≤1.16；
0.2≤TTL/(BFL*fW’)≤0.5。
since, in the embodiment of the present invention, four lens groups are arranged in order from the object side to the image side in the lens barrel in a specific order, and the lens groups in the lens barrel satisfy: -1.0. ltoreq.f 2/((f)W’*fT’)1/2)≤-0.5；0.56≤f4/((fW’*fT’)1/2)≤1.16；0.2≤TTL/(BFL*fW') is less than or equal to 0.5; and under the same conditions, the size and the aperture of the target surface of the lens are increased to a certain extent, so that the acquired image resolution is higher, the light transmission amount of the lens can be still ensured under a low-illumination scene, the acquired image quality is better, and the optical total length of the lens is reduced. Therefore, the embodiment of the invention provides the continuous zooming optical imaging lens with the large target surface, the ultra-large aperture and the high resolution.
Generally, when light rays of a spherical lens enter the lens and then reach a focal plane, the light rays are easily severely refracted and bent at the edge part than at the central part, which results in sharpnessAnd a reduction in contrast and generation of flare, thereby deteriorating image quality. And such aberrations are called spherical aberrations. In an embodiment of the present invention, a lens group satisfies the following conditions: -1.0. ltoreq.f 2/((f)W’*fT’)1/2)≤-0.5；0.56≤f4/((fW’*fT’)1/2)≤1.16；0.2≤TTL/(BFL*fW') is less than or equal to 0.5, and the lens length, the spherical aberration and the manufacturability of the lens can also be considered.
In order to further improve the imaging quality of the lens barrel, in the embodiment of the invention, the first lens group comprises a first sub-lens group and a second positive power lens L13 which are arranged in sequence from the object side to the image side;
the first sub-lens group includes a first negative power lens L11 and a first positive power lens L12; the curvature radius of the surface of the first negative focal power lens facing the image side is the same as that of the surface of the first positive focal power lens facing the object side;
the first negative power lens comprises a meniscus lens, and the surface of the meniscus lens, which faces the object side, is convex;
the first positive power lens comprises a convex lens, and the surface of the convex lens facing the object side is a convex surface;
the second positive power lens includes a convex lens whose surface facing the object side is convex.
To further enable the system to be compact, the first negative power lens L11 and the first positive power lens L12 may be cemented or otherwise attached.
The second lens group comprises a second negative power lens L21, a third negative power lens L22 and a third positive power lens L23 which are arranged in order from the object side to the image side;
the second negative power lens comprises a biconcave lens;
the third negative power lens comprises a biconcave lens;
the third positive power lens includes a meniscus lens, and a surface thereof facing the object side is convex.
The third lens group comprises a fourth positive power lens L31, a second sub-lens group and a fifth negative power lens L34 which are arranged in sequence from the object side to the image side;
the second sub-lens group includes a fifth positive power lens L32 and a fourth negative power lens L33; the curvature radius of the surface of the fifth positive focal power lens facing the image side is the same as that of the surface of the fourth negative focal power lens facing the object side;
the fourth positive power lens comprises a biconvex lens;
the fifth positive power lens includes a biconvex lens;
the fourth negative power lens comprises a biconcave lens;
the fifth negative power lens includes a meniscus lens.
To further enable the system to be compact, the fifth positive power lens and the fourth negative power lens may be cemented or cemented.
The fourth lens group comprises a sixth positive power lens L41, a third sub-lens group, a ninth positive power lens L45 and a fourth sub-lens group which are arranged in sequence from the object side to the image side;
the third sub-lens group includes a seventh positive power lens L42, a sixth negative power lens L43, and an eighth positive power lens L44; the curvature radius of the surface of the seventh positive power lens facing the image side is the same as that of the surface of the sixth negative power lens facing the object side; the curvature radius of the surface of the sixth negative power lens facing the image side is the same as that of the surface of the eighth positive power lens facing the object side;
the fourth sub-lens group includes a seventh negative power lens L46 and a tenth positive power lens L47; the curvature radius of the surface of the seventh negative power lens facing the image side is the same as that of the surface of the tenth positive power lens facing the object side;
the sixth positive power lens includes a biconvex lens;
the seventh positive power lens includes a biconvex lens;
the sixth negative power lens comprises a biconcave lens;
the eighth positive power lens comprises a meniscus lens, and the surface of the meniscus lens facing the object side is a convex surface;
the ninth positive power lens includes a biconvex lens;
the seventh negative power lens comprises a biconcave lens;
the tenth positive power lens includes a double convex lens.
To further enable the system to be compact, the seventh positive power lens, the sixth negative power lens and the eighth positive power lens may be cemented together, making up a triple cemented lens or a cemented joint. The seventh negative power lens and the tenth positive power lens may be cemented or adhesively connected.
In order to increase the refractive index of the lens and reduce the total length of the lens, in the embodiment of the present invention, the refractive indexes of the third positive power lens, the fourth positive power lens, the sixth positive power lens and the tenth positive power lens are all greater than or equal to 1.9. The refractive indexes of the third positive focal power lens, the fourth positive focal power lens, the sixth positive focal power lens and the tenth positive focal power lens can be the same or different. And the refractive indexes of the third positive focal power lens, the fourth positive focal power lens, the sixth positive focal power lens and the tenth positive focal power lens are all larger than or equal to 1.9, so that the spherical aberration can be reduced, and the image quality can be improved.
In the embodiment of the invention, in order to realize day and night confocal and no thermalization in the full focal section of the lens, namely clear imaging can be realized at-40 ℃ to 80 ℃, in the embodiment of the invention, the abbe number of the first positive focal power lens is more than or equal to 70; and the Abbe numbers of the second negative focal power lens, the third negative focal power lens, the fifth positive focal power lens and the seventh positive focal power lens are all more than or equal to 65. In addition, the abbe number of the first positive power lens is 70 or more; the abbe numbers of the second negative focal power lens, the third negative focal power lens, the fifth positive focal power lens and the seventh positive focal power lens are all more than or equal to 65, and the chromatic aberration of the image can be reduced, so that the image quality is improved. The abbe numbers of the first positive focal power lens, the second negative focal power lens, the third negative focal power lens, the fifth positive focal power lens and the seventh positive focal power lens can be the same or different.
In the embodiment of the present invention, an aperture stop P is disposed between the second lens group and the third lens group.
Wherein, the aperture diaphragm is arranged at a position close to the front of the third lens group and is used for controlling the aperture and the area of the light beam entering the system.
The aperture size of the aperture diaphragm determines the aperture value of the lens and the depth of field during shooting, the aperture size can be fixed, or the aperture diaphragm with adjustable aperture can be placed according to the requirement to realize the adjustment of the clear aperture, namely the purpose of changing the aperture value of the lens and the depth of field is achieved.
In the embodiment of the present invention, a filter M is disposed between the fourth lens group and the imaging surface. Filters are optical devices used to select a desired wavelength band of radiation.
A light splitting device Q is arranged between the fourth lens group and the optical filter;
the light splitting device comprises two prisms, and the joint surfaces of the two prisms are provided with film layers with light splitting functions; the light emergent side of each prism is respectively provided with a corresponding optical filter and an imaging surface;
the light reflected by each joint surface is vertical to an imaging surface for receiving the light.
In order to optimize visible light and infrared light respectively, the lens further includes a light splitting device, the light splitting device is a prism group formed by two prisms, a film layer with a light splitting function is arranged on a joint surface of the two prisms, and the film layer can be set according to user requirements, for example, the film layer can reflect visible light and transmit infrared light, and the film layer can reflect infrared light and transmit visible light. Two prisms in the prism set can be respectively connected to an imaging chip, such as a Complementary Metal Oxide Semiconductor (CMOS) chip. The imaging chip receives the visible light image and the infrared light image respectively, and then the visible light image and the infrared light image can be fused through an image fusion algorithm. Therefore, weak white light supplement can be adopted in a low-illumination environment, and appropriate infrared light supplement is combined to realize scene supplement, so that the quality of the fused image is ensured. The dazzling feeling of drivers or pedestrians caused by the use of strong white light flashing lamps in the prior art is avoided. The light-emitting side of each prism is provided with a corresponding optical filter and an imaging surface respectively. In order to further improve the light reflectivity and the utilization rate and avoid low image brightness, the light reflected by each joint surface is vertical to an imaging surface for receiving the light.
Fig. 1 is a schematic structural diagram of the lens in a short focus state, and fig. 2 is a schematic structural diagram of the lens in a long focus state.
The following exemplifies the lens parameters provided by the embodiment of the present invention.
Example 1:
in a specific implementation, the curvature radius R, the center thickness Tc, the refractive index Nd, and the abbe constant Vd of each lens of the lens barrel satisfy the conditions listed in table 1:
TABLE 1
The lens provided in embodiment 1 has the following optical technical indexes:
the total optical length TTL is less than or equal to 119 mm;
focal length f' of the lens: 16(W) -60 (T) mm;
angle of view of lens: 31.2 ° (W) -8.5 ° (T);
optical distortion of the lens: -2.7% (W) -0.43% (T);
aperture F/#oflens system: f1.4;
size of a lens image plane: 1/1.8'.
Note: w represents short focus, and T represents long focus.
The imaging system provided by the present embodiment will be further described by analyzing the embodiments in detail.
The optical transfer function is used for evaluating the imaging quality of the imaging system in a more accurate, visual and common mode, the higher and smoother curve of the optical transfer function shows that the imaging quality of the system is better, and various aberrations (such as spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical axis chromatic aberration and the like) are well corrected.
As shown in fig. 3, a graph of an optical transfer function (MTF) of the lens in a wide-angle state in a visible light band; as shown in fig. 4, a graph of the optical transfer function (MTF) of the lens in the long focus state in the visible light band is shown. As can be seen from fig. 3 and 4, the optical transfer function (MTF) graphs of the wide-angle state of the lens in the visible light portion are relatively smooth and concentrated, and the average MTF value of the full field (half-image height Y' is 4.4mm) is 0.7 or more; therefore, the imaging system provided by the embodiment can achieve high resolution, and meet the imaging requirement of a 1.1-inch 1200-thousand-pixel camera; meanwhile, in a long-focus state, an optical transfer function (MTF) curve graph of the lens provided by the proposal is smooth and concentrated, and the average value of the MTF of a full field of view (the half-image height Y' is 4.4mm) reaches above 0.7, so that high imaging quality can be still kept, the lens is ensured to be suitable for a complex environment, and all-weather high-definition video monitoring is realized.
In summary, the embodiments of the present invention provide a continuous zoom optical imaging lens with a large target surface, an ultra-large aperture and a high resolution. Adopting 17 optical lenses with specific structural shapes, and arranging the optical lenses in sequence from the object side to the image side according to a specific sequence, and enabling parameters such as refractive index, Abbe coefficient and the like of the lenses to be matched with imaging conditions through distribution of the optical power of each optical lens; therefore, on the premise of larger image surface, the large aperture, high resolution and medium and long focal length are simultaneously met, and further better low-light imaging performance, better color reducibility and better environmental adaptability are realized; the method can be widely applied to the field of security monitoring.
The lens provided by the embodiment of the invention can realize the aperture F1.4, and meanwhile, the maximum imaging target surface can support a 1/1.7' image sensor; the focal length section is optimally designed, monitoring requirements required by the identification of the human face and the license plate in a middle and long distance are mainly considered, and the monitoring requirements of a new generation of products are met; and (4) pixel upgrading, which meets the resolution requirement of a new generation sensor with 1200-1600 ten thousand pixels.
The embodiment of the present invention provides a lens barrel, including a first lens group, a second lens group, a third lens group, a fourth lens group and an image plane, which are sequentially arranged from an object side to an image side; the positions of the first lens group and the third lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis; the lens group satisfies the following conditions: -1.0. ltoreq.f 2/((f)W’*fT’)1/2)≤-0.5；0.56≤f4/((fW’*fT’)1/2)≤1.16；0.2≤TTL/(BFL*fW') is less than or equal to 0.5; wherein f2 is the focal length of the second lens group, f4 is the focal length of the fourth lens group, fW' is the system focal length of the lens in the short-focus state, fT' is a system focal length of the lens in a long focus state, TTL is an optical total length of the lens, and BFL is a distance between a fourth lens group and the imaging surface of the lens in the long focus state.
Since, in the embodiment of the present invention, four lens groups are arranged in order from the object side to the image side in the lens barrel in a specific order, and the lens groups in the lens barrel satisfy: -1.0. ltoreq.f 2/((f)W’*fT’)1/2)≤-0.5；0.56≤f4/((fW’*fT’)1/2)≤1.16；0.2≤TTL/(BFL*fW') is less than or equal to 0.5; and under the same conditions, the size and the aperture of the target surface of the lens are increased to a certain extent, so that the acquired image resolution is higher, the light transmission amount of the lens can be still ensured under a low-illumination scene, the acquired image quality is better, and the optical total length of the lens is reduced. Therefore, the embodiment of the invention provides the continuous zooming optical imaging lens with the large target surface, the ultra-large aperture and the high resolution.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A lens in the lens is characterized in that the lens comprises a first lens group, a second lens group, a third lens group and a fourth lens group which are sequentially arranged from an object side to an image side, wherein the image side of the fourth lens group further comprises an imaging surface;
the positions of the first lens group and the third lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis;
the lens group satisfies the following conditions:
-1.0≤f2/((fW’*fT’)1/2)≤-0.5；
0.56≤f4/((fW’*fT’)1/2)≤1.16；
0.2≤TTL/(BFL*fW’)≤0.5；
wherein f2 is the focal length of the second lens group, f4 is the focal length of the fourth lens group, fW' is the system focal length of the lens in the short-focus state, fT' is a system focal length of the lens in a long focus state, TTL is an optical total length of the lens, and BFL is a distance between a fourth lens group and the imaging surface of the lens in the long focus state;
the third lens group consists of a fourth positive focal power lens, a second sub-lens group and a fifth negative focal power lens which are sequentially arranged from the object side to the image side;
the second sub-lens group consists of a fifth positive focal power lens and a fourth negative focal power lens; the curvature radius of the surface of the fifth positive focal power lens facing the image side is the same as that of the surface of the fourth negative focal power lens facing the object side;
the fourth positive power lens comprises a biconvex lens;
the fifth positive power lens includes a biconvex lens;
the fourth negative power lens comprises a biconcave lens;
the fifth negative power lens includes a meniscus lens.
2. The lens barrel according to claim 1, wherein the first lens group is composed of a first sub-lens group, a second positive power lens, and a third sub-lens group arranged in this order from an object side to an image side;
the first sub-lens group consists of a first negative focal power lens and a first positive focal power lens; the curvature radius of the surface of the first negative focal power lens facing the image side is the same as that of the surface of the first positive focal power lens facing the object side;
the first negative power lens comprises a meniscus lens, and the surface of the meniscus lens, which faces the object side, is convex;
the first positive power lens comprises a convex lens, and the surface of the convex lens facing the object side is a convex surface;
the second positive power lens includes a convex lens whose surface facing the object side is convex.
3. The lens barrel according to claim 2, wherein the second lens group is composed of a second negative power lens, a third negative power lens, and a third positive power lens arranged in this order from the object side to the image side;
the second negative power lens comprises a biconcave lens;
the third negative power lens comprises a biconcave lens;
the third positive power lens includes a meniscus lens, and a surface thereof facing the object side is convex.
4. The lens barrel according to claim 3, wherein the fourth lens group is composed of a sixth positive power lens, a third sub-lens group, a ninth positive power lens, and a fourth sub-lens group, which are arranged in order from the object side to the image side;
the third sub-lens group consists of a seventh positive focal power lens, a sixth negative focal power lens and an eighth positive focal power lens; the curvature radius of the surface of the seventh positive power lens facing the image side is the same as that of the surface of the sixth negative power lens facing the object side; the curvature radius of the surface of the sixth negative power lens facing the image side is the same as that of the surface of the eighth positive power lens facing the object side;
the fourth sub-lens group consists of a seventh negative focal power lens and a tenth positive focal power lens; the curvature radius of the surface of the seventh negative power lens facing the image side is the same as that of the surface of the tenth positive power lens facing the object side;
the sixth positive power lens includes a biconvex lens;
the seventh positive power lens includes a biconvex lens;
the sixth negative power lens comprises a biconcave lens;
the eighth positive power lens comprises a meniscus lens, and the surface of the meniscus lens facing the object side is a convex surface;
the ninth positive power lens includes a biconvex lens;
the seventh negative power lens comprises a biconcave lens;
the tenth positive power lens includes a double convex lens.
5. The lens barrel as claimed in claim 4, wherein the refractive index of each of the third, fourth, sixth and tenth positive power lenses is 1.9 or more.
6. The lens barrel according to claim 4, wherein an abbe number of the first positive power lens is 70 or more; and the Abbe numbers of the second negative focal power lens, the third negative focal power lens, the fifth positive focal power lens and the seventh positive focal power lens are all more than or equal to 65.
7. The lens barrel according to claim 1, wherein an aperture stop is provided between the second lens group and the third lens group.
8. The lens barrel according to claim 1, wherein a filter is provided between the fourth lens group and the imaging surface.
9. The lens barrel according to claim 8, wherein a light splitting device is provided between the fourth lens group and the filter;
the light splitting device consists of two prisms, and the joint surfaces of the two prisms are provided with film layers with light splitting functions; the light emergent side of each prism is respectively provided with a corresponding optical filter and an imaging surface;
the light reflected by each joint surface is vertical to an imaging surface for receiving the light.
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| CN201910980079.1A CN110673315B (en) | 2019-10-15 | 2019-10-15 | Lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910980079.1A CN110673315B (en) | 2019-10-15 | 2019-10-15 | Lens |
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| CN110673315B true CN110673315B (en) | 2021-07-20 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212111958U (en) * | 2020-03-20 | 2020-12-08 | 华为技术有限公司 | Zoom lens, camera module and terminal equipment |
| CN111474685B (en) * | 2020-06-01 | 2021-08-03 | 中国科学院长春光学精密机械与物理研究所 | Long-focus wide-spectrum achromatic optical lens |
| CN114994887B (en) * | 2022-07-25 | 2022-10-21 | 浙江大华技术股份有限公司 | Lens and camera device |
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| CN104620150A (en) * | 2012-09-11 | 2015-05-13 | 理光映像有限公司 | Zoom lens system and electronic imaging device provided with same |
| CN206804983U (en) * | 2017-05-16 | 2017-12-26 | 西安微普光电技术有限公司 | A kind of continuous zooming optical camera lens |
| CN109239896A (en) * | 2017-07-10 | 2019-01-18 | 佳能株式会社 | Zoom lens and image pick-up device |
| JP2019015956A (en) * | 2017-07-10 | 2019-01-31 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| EP3444654A2 (en) * | 2004-10-01 | 2019-02-20 | Nikon Corporation | Zoom lens system with vibration reduction |
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| EP3444654A2 (en) * | 2004-10-01 | 2019-02-20 | Nikon Corporation | Zoom lens system with vibration reduction |
| CN104620150A (en) * | 2012-09-11 | 2015-05-13 | 理光映像有限公司 | Zoom lens system and electronic imaging device provided with same |
| CN206804983U (en) * | 2017-05-16 | 2017-12-26 | 西安微普光电技术有限公司 | A kind of continuous zooming optical camera lens |
| CN109239896A (en) * | 2017-07-10 | 2019-01-18 | 佳能株式会社 | Zoom lens and image pick-up device |
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