CN114967083A - Zoom lens - Google Patents

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Publication number
CN114967083A
CN114967083A CN202210583397.6A CN202210583397A CN114967083A CN 114967083 A CN114967083 A CN 114967083A CN 202210583397 A CN202210583397 A CN 202210583397A CN 114967083 A CN114967083 A CN 114967083A
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Prior art keywords
lens
lens group
optical axis
zoom
image
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CN114967083B (en
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蓝岚
梁伟朝
应永茂
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Sunny Optics Zhongshan Co Ltd
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Sunny Optics Zhongshan Co Ltd
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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
    • G02B15/1445—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 negative
    • G02B15/144511—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 negative arranged -+-+

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  • Optics & Photonics (AREA)
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Abstract

The invention relates to a zoom lens, which sequentially comprises the following components in the direction from an object side to an image side along an optical axis: a first lens group (G1) with negative focal power, a second lens group (G2) with positive focal power, a diaphragm (S), a third lens group (G3) with negative focal power and a fourth lens group (G4) with positive focal power, wherein the first lens group (G1) is fixed relative to the position of an image plane (IMA), the second lens group (G2) moves between the image plane (IMA) and an object plane along the optical axis, the third lens group (G3) is fixed relative to the position of the image plane (IMA), and the fourth lens group (G4) moves along the optical axis in a non-linear mode corresponding to the movement of the second lens group (G2); alternatively, the third lens group (G3) is moved non-linearly along the optical axis in accordance with the movement of the second lens group (G2), and the position of the fourth lens group (G4) with respect to the image plane (IMA) is fixed. The lens realizes an ultra-large field angle at a wide-angle end, microminiaturization and low cost, and has high definition resolution in a zooming process.

Description

Zoom lens
Technical Field
The invention relates to the technical field of optical systems, in particular to a zoom lens.
Background
Nowadays, the application of electronic technology is becoming more and more extensive, and optical lenses are used as "eyes" of machines, and now, many new application fields are continuously developed. In addition to the three major business markets of security, mobile phone and vehicle-mounted, as a main collecting component of an optical signal, an optical lens has become an important component of new terminal electronic products such as AI identification, projection video, smart home, virtual reality, laser projection and the like. The optical lenses mounted on different electronic devices are also slightly different in form and technical standard.
The safety monitoring system is the important thing of thing networking in intelligent house application, through effectively linking together surveillance camera head, window sensor, intelligent doorbell (built-in camera), infrared monitor etc. the user can look over indoor real-time condition anytime and anywhere through cell-phone, Ipad, guarantee house safety.
Most of the smart home lenses in the market are fixed-focus lenses or binocular lenses, and in the digital zooming process, the definition is reduced, and continuous zooming cannot be realized. Moreover, the clear aperture and the volume of the traditional optical zoom lens are large, and the requirements of miniaturization and low cost of smart homes cannot be met.
Therefore, a small-sized zoom lens which is applied to smart home equipment, can replace a fixed-focus lens in multiple occasions, has low cost and high performance, does not generate virtual focus at the ambient temperature of between 40 ℃ below zero and 80 ℃ at high temperature, and has a night vision function in a dark environment at night needs to be designed.
Disclosure of Invention
In order to solve the above problems of the prior art, an object of the present invention is to provide a zoom lens.
To achieve the above object, the present invention provides a zoom lens, comprising, in order from an object side to an image side along an optical axis: the zoom lens comprises a first lens group with negative focal power, a second lens group with positive focal power, a diaphragm, a third lens group with negative focal power and a fourth lens group with positive focal power, wherein the first lens group is fixed relative to the position of an image plane and is used for realizing the movement of the second lens group with variable magnification from a wide-angle end to a telephoto end between the image plane and an object plane along an optical axis,
the third lens group is fixed relative to the position of the image surface, and the fourth lens group for focusing does nonlinear movement along an optical axis corresponding to the movement of the second lens group;
or the third lens group for focusing does nonlinear movement along the optical axis corresponding to the movement of the second lens group, and the position of the fourth lens group relative to the image plane is fixed.
According to an aspect of the present invention, the first lens group includes, in order from an object side to an image side along an optical axis: the lens comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with positive focal power.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the first lens is a convex-concave lens;
the second lens is a paraxial region biconcave lens or a paraxial region convex-concave lens;
the third lens is a paraxial region biconvex lens, a paraxial region convex-concave lens or a paraxial region convex-flat lens.
According to an aspect of the present invention, the second lens and the third lens are aspherical lenses.
According to one aspect of the invention, the effective clear aperture Φ of the image-side face of the first lens 2 And a radius of curvature R of an image side surface of the first lens 2 The following conditional expressions are satisfied: phi is more than or equal to 0.8 2 /(2R 2 )|≤1.0。
According to one aspect of the invention, the refractive index Nd of the first lens 1 And Abbe number Vd 1 The following conditional expressions are respectively satisfied:
1.5≤Nd 1 ≤1.8；
51.7≤Vd 1 ≤69.5。
according to an aspect of the invention, the focal length f of the second lens 2 And a focal length f of the third lens 3 The following conditional expressions are satisfied: f is more than or equal to 0.5 2 /f 3 |≤0.8。
According to an aspect of the present invention, the second lens group includes, in order from an object side to an image side along an optical axis: the lens comprises a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with negative focal power and a seventh lens with positive focal power.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the fourth lens is a paraxial region convex-concave lens or a paraxial region biconvex lens;
the fifth lens is a paraxial region biconcave lens, a paraxial region convex-concave lens or a paraxial region plano-concave lens;
the sixth lens is a convex-concave lens;
the seventh lens is a biconvex lens.
According to an aspect of the present invention, the fourth lens and the fifth lens are aspherical lenses.
According to an aspect of the invention, the sixth lens and the seventh lens are cemented to form a double cemented lens.
According to an aspect of the invention, a focal length f of the fourth lens 4 And a focal length f of the fifth lens 5 The following conditional expressions are satisfied: f is more than or equal to 0.3 4 /f 5 |≤0.9。
According to an aspect of the invention, the refractive index Nd of the sixth lens 6 And Abbe number Vd 6 The following conditional expressions are respectively satisfied:
1.9≤Nd 6 ≤2.1；
15.6≤Vd 6 ≤21.8；
refractive index Nd of the seventh lens 7 And Abbe number Vd 7 The following conditional expressions are respectively satisfied:
1.5≤Nd 7 ≤1.7；
58.9≤Vd 7 ≤66.8。
according to an aspect of the present invention, the third lens group includes: and an eighth lens having negative refractive power.
According to an aspect of the invention, the eighth lens is a paraxial convex-concave lens in a direction from the object side to the image side along the optical axis.
According to an aspect of the invention, the eighth lens is an aspherical lens.
According to an aspect of the invention, a focal length F of the third lens group Ⅲ And the effective clear aperture phi of the eighth lens 8 The following conditional expressions are satisfied: greater than or equal to 1.5 | F Ⅲ /Ф 8 |≤5.2。
According to an aspect of the present invention, the fourth lens group includes: and a ninth lens having positive optical power.
According to an aspect of the invention, the ninth lens is a paraxial region biconvex lens.
According to an aspect of the invention, the ninth lens is an aspherical lens.
According to an aspect of the present invention, the stop is a fixed aperture stop, and the stop moves along the optical axis following the second lens group during magnification change.
According to one aspect of the invention, the aspheric lens is a plastic lens.
According to an aspect of the invention, a focal length F of the first lens group Ⅰ And a focal length Fw of the zoom lens at the wide-angle end satisfies the following conditional expression: greater than or equal to 1.3 | F Ⅰ /Fw|≤1.7。
According to an aspect of the present invention, a stroke distance Δ D of the second lens group moving from the wide angle end to the telephoto end of the zoom lens and an optical system total length L of the zoom lens satisfy the following conditional expression: the absolute delta D/L is more than or equal to 0.1 and less than or equal to 0.2.
According to an aspect of the invention, a focal length F of the second lens group Ⅱ And the focal length Fw of the zoom lens at the wide-angle end and the focal length Ft of the zoom lens at the telephoto end respectively satisfy the following conditional expressions:
1.7≤|F Ⅱ /Fw|≤2.1；
0.9≤|F Ⅱ /Ft|≤1.1。
according to an aspect of the invention, a focal length F of the fourth lens group Ⅳ And the focal length Fw of the zoom lens at the wide-angle end and the focal length Ft of the zoom lens at the telephoto end respectively satisfy the following conditional expressions:
2.3≤|F Ⅳ /Fw|≤4.7；
1.2≤|F Ⅳ /Ft|≤2.5。
according to the scheme of the invention, the zoom lens breaks through the traditional optical framework of four-group and two-group zooming, adopts the first lens group with negative focal power and the second lens group with positive focal power, and reasonably sets the lens shape, focal power, clear aperture, curvature radius and other parameters in each lens group to realize the ultra-large field angle at the wide-angle end. The second lens group moves along the optical axis direction from the image surface to the object surface, the defects that the head volume of a traditional zooming framework is large and the total length of an optical system cannot be shortened are overcome, and the 2-time zooming range of the lens from the wide-angle end to the telephoto end is realized under an extremely short stroke. Meanwhile, the third lens group with negative focal power and the fourth lens group with positive focal power are adopted, various aberrations of the lens are effectively corrected, the resolution of the lens is improved, the lens is made to be ultra-small, and high-definition resolving power is achieved in the zooming process.
According to one scheme of the invention, through the combination of the specific material selection of the lens and the reasonable focal power, the optical system of the zoom lens can still ensure good resolution at the ambient temperature of between 40 ℃ below zero and 80 ℃ at high temperature, and the optical system does not have virtual focus at the ambient temperature of high and low temperature. By adopting the reasonable matching of the glass lens and the plastic lens, various performances of the system are still ensured under the condition of using less glass lenses, the production cost is greatly reduced, and the acquisition of high-definition images can be realized through the infrared confocal scheme design even under the condition of weak illumination.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1-1 schematically shows a configuration diagram of a zoom lens according to a first embodiment of the present invention at a wide-angle end;
fig. 1-2 schematically show a structure diagram of a telephoto end of a zoom lens according to a first embodiment of the present invention;
fig. 1 to 3 are diagrams schematically showing visible RAY FAN at the wide-angle end of a zoom lens according to a first embodiment of the present invention;
FIGS. 1 to 4 are schematic diagrams illustrating an infrared RAY RAY FAN at a wide-angle end of a zoom lens according to a first embodiment of the present invention;
FIGS. 1 to 5 are schematic diagrams showing a visible RAY RAY FAN at the telephoto end of a zoom lens according to a first embodiment of the present invention;
FIGS. 1-6 are schematic diagrams showing an infrared RAY RAY FAN at the telephoto end of a zoom lens according to a first embodiment of the present invention;
FIG. 2-1 is a schematic view showing a configuration of a wide-angle end of a zoom lens according to a second embodiment of the present invention;
FIG. 2-2 is a schematic structural diagram of a telephoto end of a zoom lens according to a second embodiment of the present invention;
FIGS. 2 to 3 are diagrams schematically showing visible RAY RAY FAN at the wide-angle end of a zoom lens according to a second embodiment of the present invention;
FIGS. 2 to 4 are diagrams schematically showing infrared RAY RAY FAN at the wide-angle end of a zoom lens according to a second embodiment of the present invention;
FIGS. 2 to 5 are schematic diagrams showing a visible RAY RAY FAN at the telephoto end of the zoom lens according to the second embodiment of the present invention;
FIGS. 2 to 6 are schematic diagrams showing infrared RAY RAY FAN at the telephoto end of the zoom lens according to the second embodiment of the present invention;
FIG. 3-1 is a schematic view showing a configuration of a wide-angle end of a zoom lens according to a third embodiment of the present invention;
FIG. 3-2 is a schematic structural diagram of a telephoto end of a zoom lens according to a third embodiment of the present invention;
fig. 3 to 3 are diagrams schematically showing visible RAY FAN at the wide-angle end of a zoom lens according to a third embodiment of the present invention;
FIGS. 3 to 4 are diagrams schematically showing infrared RAY RAY FAN at the wide-angle end of a zoom lens according to a third embodiment of the present invention;
3-5 are schematic diagrams showing a visible RAY RAY FAN at the telephoto end of the zoom lens according to the third embodiment of the present invention;
3-6 are drawings schematically showing infrared RAY RAY FAN at the telephoto end of the zoom lens according to the third embodiment of the present invention;
FIG. 4-1 is a schematic view showing a configuration of a wide-angle end of a zoom lens according to a fourth embodiment of the present invention;
FIG. 4-2 is a schematic structural view illustrating the telephoto end of the zoom lens according to the fourth embodiment of the present invention;
fig. 4 to 3 are diagrams schematically showing visible RAY FAN at the wide angle end of the zoom lens according to the fourth embodiment of the present invention;
4-4 are infrared RAY RAY FAN diagrams at the wide-angle end of the zoom lens system according to the fourth embodiment of the present invention;
FIGS. 4 to 5 are views schematically showing a visible RAY RAY FAN at the telephoto end of the zoom lens according to the fourth embodiment of the present invention;
fig. 4 to 6 schematically show infrared RAY FAN diagrams at the telephoto end of the zoom lens according to the fourth embodiment of the present invention.
Detailed Description
The embodiments described in this specification are to be considered in all respects as illustrative and not restrictive, and the appended drawings are intended to be part of the entire specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and simplified or conveniently indicated. Further, the components of the structures in the drawings are described separately, and it should be noted that the components not shown or described in the drawings are in a form known to those skilled in the art.
Any reference to directions and orientations in the description of the embodiments herein is merely for convenience of description and should not be construed as limiting the scope of the present invention in any way. The following description of the preferred embodiments refers to combinations of features which may be present independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.
As shown in fig. 1-1 and 1-2, the zoom lens according to the embodiment of the present invention sequentially includes, along an optical axis from an object side to an image side: a first lens group G1 having negative power, a second lens group G2 having positive power, a stop S, a third lens group G3 having negative power, a fourth lens group G4 having positive power, and a cover glass CG. Wherein, the position of the first lens group G1 relative to the image plane IMA is fixed. The second lens group G2 moves between an image plane IMA and an object plane in the optical axis direction for realizing magnification variation from the wide-angle end to the telephoto end. The position of the third lens group G3 with respect to the image plane IMA is fixed. The fourth lens group G4 makes nonlinear movement along the optical axis corresponding to the movement of the second lens group G2, which is used for focusing (or focusing), achieving image plane IMA correction, and ensuring the stability of the image plane IMA of the optical system in the process of focal length change. Alternatively, as shown in fig. 3-1 and 3-2, the position of the fourth lens group G4 with respect to the image plane IMA is fixed. The third lens group G3 makes nonlinear movement along the optical axis corresponding to the movement of the second lens group G2, so as to be used for focusing and realizing image plane IMA correction, and ensure the stability of the image plane IMA in the process of focal length change. By reasonably configuring the action modes among the lens groups and the focal power of the corresponding lens group, various aberrations of the system are well corrected, so that the resolution of the lens is improved, and high resolution is realized.
In the embodiment of the present invention, the first lens group G1 includes, in order from the object side to the image side along the optical axis: a first lens L1 having negative optical power, a second lens L2 having negative optical power, and a third lens L3 having positive optical power. Regarding the lens shape, along the optical axis from the object side to the image side, the first lens L1 is a concave-convex lens, the second lens L2 is a paraxial region biconcave lens or a paraxial region concave-convex lens, and the third lens L3 is a paraxial region biconvex lens, a paraxial region concave-convex lens or a paraxial region convex-concave lens. Among them, the second lens L2 and the third lens L3 are aspherical lenses. Effective clear aperture Φ of image-side surface of first lens L1 2 And the radius of curvature R of the image-side surface of the first lens L1 2 The following conditional expressions are satisfied: phi is more than or equal to 0.8 2 /(2R 2 ) The | is less than or equal to 1.0. The first lens group G1 includes three lenses, and by appropriately arranging the focal power, the shape of the object-side surface and the image-side surface, the surface shape, and the like of each lens, and designing the image-side surface clear aperture and the image-side surface curvature radius of the first lens L1, the clear aperture of the zoom lens optical system can be effectively reduced, and the wide-angle end field angle can be increased.
In the embodiment of the invention, the refractive index Nd of the first lens L1 1 And Abbe number Vd 1 The following conditional expressions are respectively satisfied: nd of not less than 1.5 1 Less than or equal to 1.8; and Vd is not less than 51.7 1 Less than or equal to 69.5. The first lens L1 is made of the material, which is beneficial to the small head shape of the zoom lensAnd correcting chromatic aberration of the optical system.
In the embodiment of the invention, the focal length f of the second lens L2 2 And focal length f of third lens L3 3 The following conditional expressions are satisfied: f is more than or equal to 0.5 2 /f 3 The | is less than or equal to 0.8. Preferably, the second lens L2 and the third lens L3 of the aspherical lens are plastic lenses. The reasonable collocation of the positive and negative focal powers of the plastic lens is beneficial to preventing virtual focus of the lens under different environmental temperatures.
In the embodiment of the present invention, the second lens group G2 includes, in order from the object side to the image side along the optical axis: a fourth lens L4 having positive power, a fifth lens L5 having negative power, a sixth lens L6 having negative power, and a seventh lens L7 having positive power. Regarding the lens shape, along the optical axis from the object side to the image side, the fourth lens L4 is a paraxial concave-convex lens or a paraxial biconvex lens, the fifth lens L5 is a paraxial concave-convex lens, a paraxial concave-convex lens or a paraxial plano-concave lens, the sixth lens L6 is a concave-convex lens, and the seventh lens L7 is a biconvex lens. The fourth lens L4 and the fifth lens L5 are aspheric lenses. Preferably, the aspheric lens is a plastic lens. Focal length f of fourth lens L4 4 And a focal length f of the fifth lens L5 5 The following conditional expressions are satisfied: f is more than or equal to 0.3 4 /f 5 The | is less than or equal to 0.9. The second lens group G2 uses two plastic aspheric lenses, which is beneficial to correcting spherical aberration generated in the zooming process. Meanwhile, through the reasonable collocation of the positive and negative focal powers of the fourth lens L4 to the seventh lens L7, the lens is beneficial to not being virtual focal at different ambient temperatures.
In the embodiment of the invention, the sixth lens L6 and the seventh lens L7 are cemented together to form a double cemented lens. Refractive index Nd of sixth lens L6 6 And Abbe number Vd 6 The following conditional expressions are respectively satisfied: nd of not less than 1.9 6 Less than or equal to 2.1; and Vd is not less than 15.6 6 Less than or equal to 21.8. Refractive index Nd of seventh lens L7 7 And Abbe number Vd 7 The following conditional expressions are respectively satisfied: nd of 1.5. ltoreq 7 Less than or equal to 1.7; and Vd is less than or equal to 58.9 7 Less than or equal to 66.8. The second lens group G2 comprises a double cemented glass lens composed of a sixth lens L6 and a seventh lens L7 made of the above materialsEnough effective correction system colour difference has the high characteristics of image quality contrast under the visible light, when night light is not enough, through infrared lamp light filling, and it is clear to also form an image.
In the embodiment of the present invention, the third lens group G3 includes: and an eighth lens L8 having negative optical power. The eighth lens element L8 is a paraxial concave-convex lens element extending along the optical axis from the object side to the image side. The eighth lens L8 is an aspherical lens. Preferably, the aspheric lens is a plastic lens.
In the embodiment of the present invention, the fourth lens group G4 includes: and a ninth lens L9 having positive optical power. The ninth lens L9 is a paraxial region biconvex lens. The ninth lens L9 is an aspherical lens. Preferably, the aspheric lens is a plastic lens. Various aberrations of the system are well corrected by reasonably configuring the aspheric surface and the spherical lens, so that the resolution of the lens is improved, and high-definition resolving power is realized. Meanwhile, by skillfully matching the glass and the plastic lens, the back focal drift of the lens at high and low temperatures is perfectly compensated, and clear imaging of the lens at the extreme temperature is ensured.
In the embodiment of the invention, the diaphragm S is a fixed aperture diaphragm, and the diaphragm S moves along the optical axis along with the second lens group G2 in the zooming process. It is preferable that the stop S is disposed at the image-side surface of the seventh lens L7, but it will be understood by those skilled in the art that the same performance characteristics can be achieved even if the stop S is not disposed at the image-side surface of the seventh lens L7, and this is so disposed as to reduce one structural member, which is advantageous for reducing the cost of the lens and realizing microminiaturization.
In the embodiment of the invention, the focal length F of the first lens group G1 Ⅰ And a focal length Fw of the zoom lens at the wide-angle end satisfies the following conditional expression: greater than or equal to 1.3 | F Ⅰ the/Fw is less than or equal to 1.7. This distribution of the power of the first lens group G1 is advantageous for increasing the angle of field of the lens at the wide-angle end.
In the embodiment of the present invention, the stroke distance Δ D of the second lens group G2 moving from the wide angle end to the telephoto end of the zoom lens and the total optical system length L of the zoom lens satisfy the following conditional expression: the absolute delta D/L is more than or equal to 0.1 and less than or equal to 0.2. The arrangement can realize the 2-time zooming range from the wide-angle end to the telephoto end under an extremely short stroke in the process of zooming the lens from the wide-angle end to the telephoto end, and is favorable for compressing the total length of an optical system of the lens.
In the embodiment of the invention, the focal length F of the second lens group G2 Ⅱ And the focal length Fw of the zoom lens at the wide-angle end and the focal length Ft of the zoom lens at the telephoto end respectively satisfy the following conditional expressions: greater than or equal to 1.7 | F Ⅱ the/Fw | < 2.1; and | F is not less than 0.9 Ⅱ the/Ft is less than or equal to 1.1. The refractive power of the second lens group G2 can be distributed as described above, and light can be transmitted efficiently.
In the embodiment of the invention, the focal length F of the third lens group G3 Ⅲ And effective clear aperture Φ of the eighth lens L8 8 The following conditional expressions are satisfied: greater than or equal to 1.5 | F Ⅲ /Ф 8 And | is less than or equal to 5.2, which is favorable for correcting the field curvature aberration of the optical system.
In the embodiment of the invention, the focal length F of the fourth lens group G4 Ⅳ And the focal length Fw of the zoom lens at the wide-angle end and the focal length Ft of the zoom lens at the telephoto end respectively satisfy the following conditional expressions: absolute F of 2.3 ≤ Ⅳ the/Fw is less than or equal to 4.7; and | F is not less than 1.2 Ⅳ the/Ft is less than or equal to 2.5. The reasonable optical power collocation of the fourth lens group G4 is beneficial to various aberrations brought in the zooming process of the zooming optical system so as to ensure stable imaging quality.
In summary, the zoom lens according to the embodiment of the present invention can effectively correct various aberrations such as system chromatic aberration, spherical aberration, and field curvature aberration generated during a zooming process, thereby achieving an ultra-large field angle at a wide-angle end, microminiaturization, and low cost, and having high resolution and stable imaging quality during the zooming process. Meanwhile, the lens can still ensure good resolution ratio at the ambient temperature from-40 ℃ to 80 ℃, does not generate virtual focus at high and low temperature, and can clearly image under the condition of weak illumination. The second lens group G2 moves in the optical axis direction from the image plane to the object plane, and realizes a 2-fold zoom range of the lens from the wide-angle end to the telephoto end with an extremely short stroke.
The zoom lens of the present invention is specifically described below in four embodiments with reference to the drawings and tables. In the following embodiments, the present invention will be described with the stop S as one surface and the image surface IMA as one surface.
The parameters of each example specifically satisfying the above conditional expressions are shown in table 1 below:
conditional formula (II) Example one Example two EXAMPLE III Example four
1.3≤|F Ⅰ /Fw|≤1.7 1.43 1.45 1.41 1.64
0.1≤|ΔD/L|≤0.2 0.16 0.16 0.16 0.17
1.7≤|F Ⅱ /Fw|≤2.1 1.87 1.88 1.84 2.05
0.9≤|F Ⅱ /Ft|≤1.1 0.98 0.98 0.95 1.07
1.5≤|F Ⅲ /Ф 8 |≤5.2 2.68 3.71 2.14 4.52
2.3≤|F Ⅳ /Fw|≤4.7 3.13 4.29 2.77 4.20
1.2≤|F Ⅳ /Ft|≤2.5 1.64 2.23 1.43 2.20
0.8≤|Ф 2 /(2R 2 )|≤1.0 0.90 0.94 0.87 0.92
1.5≤Nd 1 ≤1.8 1.60 1.65 1.73 1.62
51.7≤Vd 1 ≤69.5 66.46 58.41 54.67 63.40
0.5≤|f 2 /f 3 |≤0.8 0.59 0.66 0.67 0.74
0.3≤|f 4 /f 5 |≤0.9 0.44 0.45 0.47 0.74
1.9≤Nd 6 ≤2.1 1.92 1.95 2.00 1.92
15.6≤Vd 6 ≤21.8 20.88 17.95 19.31 20.88
1.5≤Nd 7 ≤1.7 1.60 1.62 1.64 1.64
58.9≤Vd 7 ≤66.8 65.46 63.4 60.21 60.21
TABLE 1
In an embodiment of the present invention, the plastic aspheric lens of the zoom lens satisfies the following formula:
Figure BDA0003662546490000111
in the above formula, z is the axial distance from the curved surface to the vertex at the position of the height y perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a. the 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 The aspherical coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders are expressed respectively.
Example one
Referring to fig. 1-1 and 1-2, the parameters of the zoom lens in the present embodiment are as follows:
focal length: 3.36-6.39 mm; FNo: 1.68-2.44.
In this embodiment, the first lens group G1 and the third lens group G3 are fixed with respect to the image plane IMA, the second lens group G2 moves along the optical axis from the image plane IMA side to the object plane side, so as to achieve magnification variation from the wide-angle end to the telephoto end, and the fourth lens group G4 performs corresponding nonlinear movement along the optical axis, so as to achieve correction and focusing of the image plane IMA, and ensure stability of the system image plane IMA in the process of focal length variation. The lens comprises three glass lenses, six plastic aspheric lenses, and a fixed diaphragm S superposed with the image side surface of the seventh lens L7.
Table 2 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
Figure BDA0003662546490000112
Figure BDA0003662546490000121
TABLE 2
Table 3 lists aspherical coefficients of the respective aspherical lenses of the zoom lens of the present embodiment, including: the Conic constant K (also called Conic value) and the fourth-order aspheric coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 And fourteen order aspheric coefficients A 14 。
Figure BDA0003662546490000122
Figure BDA0003662546490000131
TABLE 3
Table 4 lists the interval D1 between the first lens group G1 and the second lens group G2, the interval D2 between the second lens group G2 and the third lens group G3, the interval D3 between the third lens group G3 and the fourth lens group G4, and the interval D4 between the fourth lens group G4 and the cover glass CG, when the zoom lens of the present embodiment is changed from the wide-angle end to the telephoto end. Here, the interval D1 is a central distance between an image-side surface of the last lens in the first lens group G1 and an object-side surface of the first lens in the second lens group G2, the interval D2 is a central distance between an image-side surface of the last lens in the second lens group G2 and an object-side surface of the first lens in the third lens group G3, the interval D3 is a central distance between an image-side surface of the eighth lens L8 and an object-side surface of the ninth lens L9, and the interval D4 is a central distance between an image-side surface of the ninth lens L9 and an object-side surface of the protection glass CG.
Surface number Thickness of Wide angle end Telescope end
6 D1 4.46 0.36
13 D2 0.84 4.94
15 D3 1.56 1.28
17 D4 4.16 4.44
TABLE 4
As shown in fig. 1-1 to fig. 1-6 and tables 1 to 4, the zoom lens of the present embodiment can effectively correct various aberrations such as system chromatic aberration, spherical aberration, and field curvature aberration generated during the zooming process, thereby achieving an ultra-large field angle at the wide-angle end, microminiaturization, low cost, high resolution during the zooming process, and stable imaging quality. Meanwhile, the lens can still ensure good resolution ratio at the ambient temperature from-40 ℃ to 80 ℃, does not generate virtual focus at high and low temperature, and can clearly image under the condition of weak illumination. The second lens group G2 moves in the optical axis direction from the image plane to the object plane, and realizes a 2-fold zoom range of the lens from the wide-angle end to the telephoto end with an extremely short stroke.
Example two
Referring to fig. 2-1 and 2-2, the zoom lens of the present embodiment has the following parameters:
focal length: 3.33-6.4 mm; FNo: 1.65-2.54.
In this embodiment, the first lens group G1 and the third lens group G3 are fixed with respect to the image plane IMA, the second lens group G2 moves along the optical axis from the image plane IMA side to the object plane side, so as to achieve magnification variation from the wide-angle end to the telephoto end, and the fourth lens group G4 performs corresponding nonlinear movement along the optical axis, so as to achieve correction and focusing of the image plane IMA, and ensure stability of the system image plane IMA in the process of focal length variation. The lens comprises three glass lenses, six plastic aspheric lenses, and a fixed diaphragm S superposed with the image side surface of the seventh lens L7.
Table 5 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
Figure BDA0003662546490000141
Figure BDA0003662546490000151
TABLE 5
Table 6 lists aspherical coefficients of respective aspherical lenses of the zoom lens of the present embodiment, including: the Conic constant K (also called Conic value) and the fourth-order aspheric coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth orderAspheric coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 And fourteen order aspheric coefficients A 14 。
Surface number Conic A 4 A 6 A 8 A 10 A 12 A 14
3 -33.17 -1.01E-2 5.57E-4 -5.75E-8 -2.72E-6 1.20E-7 -4.97E-10
4 -0.69 -1.38E-2 9.31E-4 -6.26E-5 1.93E-6 -6.32E-10 -3.60E-10
5 0.37 5.03E-4 -8.06E-5 6.18E-6 1.77E-7 -1.39E-8 4.04E-12
6 -90.00 -8.23E-4 1.72E-4 -1.23E-6 1.29E-7 5.33E-10 -1.02E-6
7 0.60 -5.84E-4 3.50E-6 1.78E-6 2.36E-8 -2.56E-9 -2.74E-10
8 48.14 2.19E-3 4.56E-5 1.36E-5 -1.97E-7 4.78E-8 -3.99E-9
9 90.00 5.92E-3 -4.24E-4 2.98E-5 -1.41E-6 1.09E-8 -5.47E-10
10 21.01 5.56E-3 -4.00E-4 1.67E-5 -1.11E-6 5.28E-9 -5.98E-10
14 -0.23 -9.10E-3 2.87E-4 -1.46E-5 7.81E-7 2.40E-7 -2.65E-8
15 -0.63 -9.93E-3 2.17E-4 1.84E-5 -3.40E-6 4.79E-7 -3.27E-8
16 -47.19 -5.00E-4 -1.11E-4 -1.09E-5 -1.38E-6 4.01E-7 -4.00E-8
17 1.52 -1.13E-3 -1.47E-4 8.82E-6 -2.35E-6 2.22E-7 -1.43E-8
TABLE 6
Table 7 lists the interval D1 between the first lens group G1 and the second lens group G2, the interval D2 between the second lens group G2 and the third lens group G3, the interval D3 between the third lens group G3 and the fourth lens group G4, and the interval D4 between the fourth lens group G4 and the cover glass CG, when the zoom lens of the present embodiment is changed from the wide-angle end to the telephoto end. Here, the meanings of the intervals D1, D2, D3 and D4 are the same as those of the first embodiment.
Surface number Thickness of Wide angle end Telescope end
6 D1 4.43 0.3
13 D2 0.3 4.43
15 D3 1.57 1.67
17 D4 3.99 3.89
TABLE 7
As shown in fig. 2-1 to fig. 2-6 and tables 1 and 5 to 7, the zoom lens of the present embodiment can effectively correct various aberrations, such as system chromatic aberration, spherical aberration, and field curvature aberration, generated during the zooming process, thereby achieving an ultra-large field angle at the wide-angle end, microminiaturization, and low cost, and having high resolution and stable imaging quality during the zooming process. Meanwhile, the lens can still ensure good resolution ratio at the ambient temperature from-40 ℃ to 80 ℃, does not generate virtual focus at high and low temperature, and can clearly image under the condition of weak illumination. The second lens group G2 moves in the optical axis direction from the image plane to the object plane, and realizes a 2-fold zoom range of the lens from the wide-angle end to the telephoto end with an extremely short stroke.
EXAMPLE III
Referring to fig. 3-1 and 3-2, the zoom lens of the present embodiment has the following parameters:
focal length: 3.30-6.4 mm; FNo: 1.67-2.49.
In this embodiment, the first lens group G1 and the fourth lens group G4 are fixed with respect to the image plane IMA, the second lens group G2 moves along the optical axis from the image plane IMA side to the object plane side, so as to achieve magnification variation from the wide-angle end to the telephoto end, and the third lens group G3 performs corresponding nonlinear movement along the optical axis, so as to achieve correction and focusing of the image plane IMA, and ensure stability of the system image plane IMA in the process of focal length variation. The lens comprises three glass lenses, six plastic aspheric lenses, and a fixed diaphragm S superposed with the image side surface of the seventh lens L7.
Table 8 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
Surface number Surface type Radius of curvature Thickness of Refractive index Abbe number
1 Spherical surface 117.79 0.50 1.73 54.67
2 Spherical surface 4.19 2.99
3 Aspherical surface -35.28 0.60 1.54 55.71
4 Aspherical surface 6.27 0.10
5 Aspherical surface 10.94 1.76 1.66 20.38
6 Aspherical surface -94.83 D1
7 Aspherical surface 5.03 1.92 1.54 55.98
8 Aspherical surface 50.48 0.14
9 Aspherical surface -41.73 0.49 1.64 23.53
10 Aspherical surface 21.42 0.16
11 Spherical surface 7.14 1.20 2.00 19.3
12 Spherical surface 4.92 2.11 1.64 60.21
13(S) Spherical surface -8.32 D2
14 Aspherical surface 6.95 0.59 1.54 55.71
15 Aspherical surface 2.99 D4
16 Aspherical surface 10.36 1.79 1.54 55.98
17 Aspherical surface -8.85 3.56
18 Spherical surface Infinity 0.71 1.52 64.20
19 Spherical surface Infinity 0.27
IMA Spherical surface Infinity -
TABLE 8
Table 9 lists aspherical coefficients of respective aspherical lenses of the zoom lens of the present embodiment, including: the Conic constant K (also called Conic value) and the fourth-order aspheric coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 And fourteen order aspheric surface coefficient A 14 。
Figure BDA0003662546490000171
Figure BDA0003662546490000181
TABLE 9
Table 10 lists the interval D1 between the first lens group G1 and the second lens group G2, the interval D2 between the second lens group G2 and the third lens group G3, and the interval D3 between the third lens group G3 and the fourth lens group G4 when the zoom lens of the present embodiment changes from the wide-angle end to the telephoto end. Here, the meanings of the intervals D1, D2, and D3 are the same as those of example one.
Surface number Thickness of Wide angle end Telescope end
6 D1 4.42 0.30
13 D2 1.35 5.1
16 D3 1.31 1.68
Watch 10
As shown in fig. 3-1 to fig. 3-6 and tables 1 and 8 to 10, the zoom lens of the present embodiment can effectively correct various aberrations, such as system chromatic aberration, spherical aberration, and field curvature aberration, generated during the zooming process, thereby achieving an ultra-large field angle at the wide-angle end, ultra-miniaturization, low cost, high resolution, and stable imaging quality during the zooming process. Meanwhile, the lens can still ensure good resolution ratio at the ambient temperature from-40 ℃ to 80 ℃, does not generate virtual focus at high and low temperature, and can clearly image under the condition of weak illumination. The second lens group G2 moves in the optical axis direction from the image plane to the object plane, and realizes a 2-fold zoom range of the lens from the wide-angle end to the telephoto end with an extremely short stroke.
Example four
Referring to fig. 4-1 and 4-2, the zoom lens of the present embodiment has the following parameters:
focal length: 3.35-6.4 mm; FNo: 1.65-2.41.
In this embodiment, the first lens group G1 and the third lens group G3 are fixed with respect to the image plane IMA, the second lens group G2 moves along the optical axis from the image plane IMA side to the object plane side, so as to achieve magnification variation from the wide-angle end to the telephoto end, and the fourth lens group G4 performs corresponding nonlinear movement along the optical axis, so as to achieve correction and focusing of the image plane IMA, and ensure stability of the system image plane IMA in the process of focal length variation. The lens comprises three glass lenses, six plastic aspheric lenses, and a fixed diaphragm S superposed with the image side surface of the seventh lens L7.
Table 11 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
Figure BDA0003662546490000191
Figure BDA0003662546490000201
TABLE 11
Table 12 lists aspherical coefficients of respective aspherical lenses of the zoom lens of the present embodiment, including: the Conic constant K (also called Conic value) and the fourth-order aspheric coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspherical surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 And fourteen order aspheric coefficients A 14 。
Figure BDA0003662546490000202
Figure BDA0003662546490000211
TABLE 12
Table 13 lists the interval D1 between the first lens group G1 and the second lens group G2, the interval D2 between the second lens group G2 and the third lens group G3, the interval D3 between the third lens group G3 and the fourth lens group G4, and the interval D4 between the fourth lens group G4 and the cover glass CG, when the zoom lens of the present embodiment is changed from the wide-angle end to the telephoto end. Here, the meanings of the intervals D1, D2, D3 and D4 are the same as those of the first embodiment.
Surface number Thickness of Wide angle end Telescope end
6 D1 4.82 0.3
13 D2 0.3 4.82
15 D3 0.99 1.24
17 D4 4.44 4.19
Watch 13
As shown in fig. 4-1 to 4-6 and tables 1 and 11 to 13, the zoom lens of the present embodiment can effectively correct various aberrations, such as system chromatic aberration, spherical aberration, and field curvature aberration, generated during the zooming process, thereby achieving an ultra-large field angle at the wide-angle end, ultra-miniaturization, low cost, high resolution, and stable imaging quality. Meanwhile, the lens can still ensure good resolution ratio at the ambient temperature from-40 ℃ to 80 ℃, does not generate virtual focus at high and low temperature, and can clearly image under the condition of weak illumination. The second lens group G2 moves in the optical axis direction from the image plane to the object plane, and realizes a 2-fold zoom range of the lens from the wide-angle end to the telephoto end with an extremely short stroke.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A zoom lens includes, in order from an object side to an image side along an optical axis: a first lens group (G1) having negative optical power, a second lens group (G2) having positive optical power, a stop (S), a third lens group (G3) having negative optical power, and a fourth lens group (G4) having positive optical power, the first lens group (G1) being fixed in position with respect to an image plane (IMA), the second lens group (G2) being movable along an optical axis between the image plane (IMA) and an object plane, characterized in that,
the position of the third lens group (G3) is fixed relative to the image plane (IMA), and the fourth lens group (G4) performs nonlinear movement along the optical axis corresponding to the movement of the second lens group (G2);
alternatively, the third lens group (G3) is moved non-linearly along an optical axis in accordance with the movement of the second lens group (G2), and the position of the fourth lens group (G4) with respect to the image plane (IMA) is fixed.
2. A zoom lens according to claim 1, wherein the first lens group (G1) comprises, in order in a direction from the object side to the image side along the optical axis: a first lens (L1) with negative optical power, a second lens (L2) with negative optical power, and a third lens (L3) with positive optical power.
3. The zoom lens according to claim 2, wherein, in a direction from the object side to the image side along the optical axis,
the first lens (L1) is a concave-convex lens;
the second lens (L2) is a paraxial biconcave lens or a paraxial convexo-concave lens;
the third lens (L3) is a paraxial region biconvex lens, a paraxial region convex-concave lens or a paraxial region convex-flat lens.
4. A zoom lens according to claim 2, wherein the second lens (L2) and the third lens (L3) are aspherical lenses.
5. A zoom lens according to claim 2, wherein the effective clear aperture Φ of the image-side surface of the first lens (L1) 2 And a radius of curvature R of an image-side surface of the first lens (L1) 2 The following conditional expressions are satisfied: phi is more than or equal to 0.8 2 /(2R 2 )|≤1.0。
6. Zoom lens according to claim 2, wherein the refractive index Nd of the first lens (L1) 1 And Abbe number Vd 1 The following conditional expressions are respectively satisfied:
1.5≤Nd 1 ≤1.8；
51.7≤Vd 1 ≤69.5。
7. zoom lens according to claim 2, wherein the focal length f of the second lens (L2) 2 And a focal length f of the third lens (L3) 3 The following conditional expressions are satisfied: f is more than or equal to 0.5 2 /f 3 |≤0.8。
8. A zoom lens according to claim 1, wherein the second lens group (G2) comprises, in order in a direction from the object side to the image side along the optical axis: a fourth lens (L4) with positive optical power, a fifth lens (L5) with negative optical power, a sixth lens (L6) with negative optical power, and a seventh lens (L7) with positive optical power.
9. The zoom lens according to claim 8, wherein, in a direction from the object side to the image side along the optical axis,
the fourth lens (L4) is a paraxial region convex-concave lens or a paraxial region biconvex lens;
the fifth lens (L5) is a paraxial region biconcave lens, a paraxial region convex-concave lens or a paraxial region plano-concave lens;
the sixth lens (L6) is a concave-convex lens;
the seventh lens (L7) is a biconvex lens.
10. The zoom lens according to claim 8, wherein the fourth lens (L4) and the fifth lens (L5) are aspherical lenses.
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CN214846007U (en) * 2021-03-24 2021-11-23 舜宇光学(中山)有限公司 Zoom lens

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