CN116699816A - Zoom lens - Google Patents

Zoom lens Download PDF

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Publication number
CN116699816A
CN116699816A CN202210171280.7A CN202210171280A CN116699816A CN 116699816 A CN116699816 A CN 116699816A CN 202210171280 A CN202210171280 A CN 202210171280A CN 116699816 A CN116699816 A CN 116699816A
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CN
China
Prior art keywords
lens
zoom lens
zoom
angle end
wide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210171280.7A
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Chinese (zh)
Inventor
刘峥嵘
张磊
张占军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongguan Yutong Optical Technology Co Ltd
Original Assignee
Dongguan Yutong Optical Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongguan Yutong Optical Technology Co Ltd filed Critical Dongguan Yutong Optical Technology Co Ltd
Priority to CN202210171280.7A priority Critical patent/CN116699816A/en
Priority to PCT/CN2023/077773 priority patent/WO2023160594A1/en
Priority to KR1020237023219A priority patent/KR20230129021A/en
Publication of CN116699816A publication Critical patent/CN116699816A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • G02B15/142—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 two groups only
    • G02B15/1425—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 two groups only the first group being negative
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • 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
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B2003/0093—Simple or compound lenses characterised by the shape

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)

Abstract

The embodiment of the invention discloses a zoom lens. The zoom lens comprises a first lens group with negative focal power and a second lens group with positive focal power, which are sequentially arranged from an object side to an image side along an optical axis, and the focal length of the zoom lens is changed by changing the positions of the first lens group and the second lens group on the optical axis; the first lens group comprises a first lens, a second lens and a third lens which are sequentially arranged from the object side to the image side along the optical axis; the second lens group includes a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in order from the object side to the image side along the optical axis. The zoom lens provided by the embodiment of the invention is a two-component zoom lens so as to realize a high-resolution optical lens with small volume and large aperture. The zoom lens uses 7 lenses to realize the high-performance small day and night confocal zoom lens with the focal length from 3mm to 6mm under the 1/2.7 inch CMOS target surface.

Description

Zoom lens
Technical Field
The embodiment of the invention relates to a lens technology, in particular to a zoom lens.
Background
With the continuous development of society and the continuous progress of scientific technology, in recent years, an optical imaging lens is also rapidly developed, and the optical imaging lens is widely applied to various fields such as video conferences, security monitoring, vehicle-mounted monitoring, unmanned aerial vehicle aerial photography, intelligent traffic and the like. Zoom lenses are increasingly used because the shooting range can be changed by varying the focal length without changing the shooting distance.
However, the zoom lens used in the fields of security monitoring, unmanned aerial vehicle aerial photography and the like in the current market has many defects, such as a large number of lenses, low imaging resolution, small imaging surface, large volume and the like, so that improvement is needed.
Disclosure of Invention
The embodiment of the invention provides a zoom lens, which is a two-component zoom lens to realize a high-resolution optical lens with small volume and large aperture. The zoom lens uses 7 lenses to realize the high-performance small day and night confocal zoom lens with the focal length from 3mm to 6mm under the 1/2.7 inch CMOS target surface.
The embodiment of the invention provides a zoom lens, which comprises a first lens group with negative focal power and a second lens group with positive focal power, wherein the first lens group and the second lens group with positive focal power are sequentially arranged from an object side to an image side along an optical axis, and the focal length of the zoom lens is changed by changing the positions of the first lens group and the second lens group on the optical axis;
the first lens group comprises a first lens, a second lens and a third lens which are sequentially arranged from the object side to the image side along the optical axis;
the second lens group comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from the object side to the image side along the optical axis;
the first lens has negative optical power, the second lens has negative optical power, the third lens has positive optical power, the fourth lens has positive optical power, the fifth lens has positive optical power, the sixth lens has negative optical power, and the seventh lens has positive optical power.
Optionally, the first lens is a convex-concave glass spherical lens, the second lens is a biconcave plastic aspheric lens, the third lens is a convex-concave or biconvex plastic aspheric lens, the fourth lens is a biconvex glass spherical lens, the fifth lens is a biconvex plastic aspheric lens, the sixth lens is a biconcave plastic aspheric lens, and the seventh lens is a biconvex or convex-concave plastic aspheric lens.
Optionally, the powers of the first lens to the seventh lens satisfy:
wherein , andRespectively representing the optical powers of the first lens to the seventh lens, +.>Representing the optical power of said first lens group, < >>Representing the optical power of the second lens group.
Optionally, the refractive index and the dispersion coefficient of the third lens to the seventh lens satisfy:
1.497≤n3≤1.710；17.0≤v3≤20.8；
1.400≤n4≤1.730；53.4≤v4≤96.0；
1.402≤n5≤1.702；42.1≤v5≤60.0；
1.498≤n6≤1.710；17.0≤v6≤36.7；
1.425≤n7≤1.710；17.0≤v7≤60.0；
wherein n3, n4, n5, n6 and n7 sequentially represent refractive indexes of the third lens to the seventh lens, respectively, and v3, v4, v5, v6 and v7 sequentially represent abbe numbers of the third lens to the seventh lens, respectively.
Optionally, the displacement amount g1_l of the first lens group from the wide-angle end to the telephoto end, the displacement amount g2_l of the second lens group from the wide-angle end to the telephoto end, and the total lens length ttl_w of the zoom lens at the wide-angle end satisfy:
0.13≤G1_L/TTL_W≤0.25；
0.07≤G2_L/TTL_W≤0.19。
optionally, the image plane diameter IC of the zoom lens and the focal length f_w of the zoom lens at the wide-angle end satisfy:
F_W/IC≤0.51。
optionally, the back focal length bfl_w of the zoom lens at the wide-angle end and the total lens length ttl_w of the zoom lens at the wide-angle end satisfy:
BFL_W/TTL_W≥0.10。
optionally, the diameter D1 of the first lens and the total lens length ttl_w of the zoom lens at the wide-angle end satisfy:
D1/TTL_W<0.58。
optionally, the zoom lens is arranged onOptical power at wide angle endAnd optical power at the tele end +.>The method meets the following conditions:
optionally, the zoom lens further comprises a diaphragm;
the diaphragm is positioned between the third lens and the fourth lens.
The zoom lens provided by the embodiment of the invention comprises the first lens group with negative focal power and the second lens group with positive focal power which are sequentially arranged from the object side to the image side along the optical axis, and particularly 7 lenses are adopted, so that the number of lenses is small, and the reduction of the lens volume is facilitated. Switching the zoom lens at the wide-angle end and the telephoto end by moving the first lens group and the second lens group on the optical axis, wherein the total effective focal length of the zoom lens is continuously zoomed within a range of 3mm to 6 mm; through the reasonable design of the structure and the focal power collocation relation of each lens, the zoom lens realizes a high-performance small day and night confocal zoom lens under a 1/2.7 inch CMOS target surface.
Drawings
Fig. 1 is a schematic structural diagram of a wide-angle end of a zoom lens according to an embodiment of the present invention;
FIG. 2 is a schematic view of a structure of a telephoto end of the zoom lens of FIG. 1;
FIG. 3 is a graph showing a wide-angle end spherical aberration of a zoom lens according to the present embodiment;
FIG. 4 is a graph showing a spherical aberration curve of a telephoto end of the zoom lens according to the present embodiment;
fig. 5 is a long Jiao Duanguang line fan diagram of a zoom lens according to the present embodiment;
fig. 6 is a long Jiao Duanguang line fan diagram of a zoom lens according to the present embodiment;
fig. 7 is a field curvature distortion diagram of a wide-angle end of a zoom lens according to the present embodiment;
fig. 8 is a field curvature distortion diagram of a telephoto end of the zoom lens according to the present embodiment;
fig. 9 is a schematic view of a structure of a wide-angle end of another zoom lens according to an embodiment of the present invention;
FIG. 10 is a schematic view of a structure of a telephoto end of the zoom lens of FIG. 9;
FIG. 11 is a graph showing a wide-angle end spherical aberration of a zoom lens according to the present embodiment;
FIG. 12 is a graph showing a spherical aberration curve of a telephoto end of the zoom lens according to the present embodiment;
fig. 13 is a long Jiao Duanguang-line fan diagram of a zoom lens according to the present embodiment;
fig. 14 is a long Jiao Duanguang-line fan diagram of a zoom lens according to the present embodiment;
fig. 15 is a field curvature distortion diagram at the wide-angle end of the zoom lens according to the present embodiment;
fig. 16 is a field curvature distortion diagram of a telephoto end of the zoom lens according to the present embodiment;
fig. 17 is a schematic view of a structure of a wide-angle end of a zoom lens according to another embodiment of the present invention;
FIG. 18 is a schematic view of a zoom lens of FIG. 17;
FIG. 19 is a wide-angle end spherical aberration diagram of a zoom lens according to the present embodiment;
FIG. 20 is a graph showing a spherical aberration curve of a telephoto end of the zoom lens according to the present embodiment;
fig. 21 is a long Jiao Duanguang-line fan diagram of a zoom lens according to the present embodiment;
fig. 22 is a long Jiao Duanguang-line fan diagram of a zoom lens according to the present embodiment;
fig. 23 is a field curvature distortion diagram at the wide-angle end of the zoom lens in the present embodiment;
fig. 24 is a field curvature distortion diagram of a telephoto end of the zoom lens according to the present embodiment.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that, the terms "upper", "lower", "left", "right", and the like in the embodiments of the present invention are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in the context, it will also be understood that when an element is referred to as being formed "on" or "under" another element, it can be directly formed "on" or "under" the other element or be indirectly formed "on" or "under" the other element through intervening elements. The terms "first," "second," and the like, are used for descriptive purposes only and not for any order, quantity, or importance, but rather are used to distinguish between different components. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Fig. 1 is a schematic structural diagram of a wide-angle end of a zoom lens according to an embodiment of the present invention. Referring to fig. 1, a zoom lens provided by an embodiment of the present invention includes a first lens group 10 of negative power and a second lens group 20 of positive power arranged in order from an object side to an image side along an optical axis, a focal length of the zoom lens being changed by changing positions of the first lens group 10 and the second lens group 20 on the optical axis; the first lens group 10 includes a first lens 101, a second lens 102, and a third lens 103 arranged in order from the object side to the image side along the optical axis; the second lens group 20 includes a fourth lens 201, a fifth lens 202, a sixth lens 203, and a seventh lens 204, which are arranged in order from the object side to the image side along the optical axis; the first lens 101 has negative power, the second lens 102 has negative power, the third lens 103 has positive power, the fourth lens 201 has positive power, the fifth lens 202 has positive power, the sixth lens 203 has negative power, and the seventh lens 204 has positive power.
It is understood that the optical power is the inverse of the focal length and characterizes the ability of the optical system to deflect light. The greater the absolute value of the optical power, the greater the ability to bend the light, the smaller the absolute value of the optical power, and the weaker the ability to bend the light. When the focal power is positive, the refraction of the light rays is convergent; when the optical power is negative, the refraction of the light is divergent. In the present embodiment, the first lens group 10 and the second lens group 20 may be disposed in one barrel (not shown in fig. 1), and movement of the first lens group 10 and the second lens group 20 achieves lens focal length variation, and by setting the power relationship of the respective lenses, the total effective focal length of the zoom lens can be continuously zoomed in a range of 3mm to 6 mm.
The zoom lens is located at the wide angle end through the zoom lens with the shortest focal length in the zooming process, and the zoom lens with the longest focal length is located at the tele end, and has different focal lengths and focal powers at the wide angle end and the tele end, and also has different lengths or forms.
According to the technical scheme, the first lens group and the second lens group move on the optical axis to enable the zoom lens to be switched between the wide-angle end and the long-focus end, wherein the total effective focal length of the zoom lens is continuously zoomed within the range of 3 mm-6 mm; through the reasonable design of the structure and the focal power collocation relation of each lens, the zoom lens realizes a high-performance small day and night confocal zoom lens under a 1/2.7 inch CMOS target surface. And 7 lenses are adopted specifically, the number of lenses is small, and therefore the size of the lens is reduced. By reasonably matching the lens groups and the focal power of the lenses, the aberration balance of each focal segment can be effectively realized, and the definition of images in different focal length states is ensured, so that higher image quality is realized within shorter full-length limit, and the cost and weight are reduced.
Optionally, the first lens 101 is a convex-concave glass spherical lens, the second lens 102 is a biconcave plastic aspherical lens, the third lens 103 is a convex-concave or biconvex plastic aspherical lens, the fourth lens 201 is a biconvex glass spherical lens, the fifth lens 202 is a biconvex plastic aspherical lens, the sixth lens 203 is a biconcave plastic aspherical lens, and the seventh lens 204 is a biconvex or convex-concave plastic aspherical lens.
Among them, by providing the second lens 102, the third lens 103, the fifth lens 202, the sixth lens 203, and the seventh lens 204 as aspherical lenses, higher order aberrations can be effectively corrected. Meanwhile, the cost of forming the aspherical lens by the plastic material is far lower than that of forming the aspherical lens by the glass material, and the cost of the zoom lens can be reduced by adopting the plastic aspherical lens.
The aspherical lens face satisfies the formula:
wherein Z represents the sagittal height of the aspherical surface, c represents the basic curvature at the apex, k represents the conic constant, r represents the radial coordinate perpendicular to the optical axis, a i For higher order term coefficients, a i r 2i Is an aspheric higher order term.
Further, the glass lens has a strong light turning capability, and the first lens 101 and the fourth lens 201 are spherical glass lenses, which is helpful for reducing the number of lenses and thus the volume of the lens.
Meanwhile, the two materials, namely glass and plastic, can play a role in mutual compensation, and can balance high and low temperatures, so that the zoom lens has the characteristic of stable high and low temperature performance, and the environmental adaptability of the zoom lens is improved.
The material of the plastic aspheric lens may be various plastics known to those skilled in the art, and the material of the glass spherical lens may be various types of glass known to those skilled in the art, which is not limited in the embodiment of the present invention.
In addition, through the shape of rationally setting up each lens, when satisfying the optical power requirement in above-mentioned embodiment, still can guarantee that whole zoom lens compact structure, the integrated level is high.
Optionally, the powers of the first lens 101 to the seventh lens 204 satisfy:
wherein , andRespectively representing the powers of the first lens 101 to the seventh lens 204, +.>Represents the optical power of the first lens group 10, < >>Representing the optical power of the second lens group 20.
Optionally, the refractive index and the dispersion coefficient of the third lens 103 to the seventh lens 204 satisfy:
1.497≤n3≤1.710；17.0≤v3≤20.8；
1.400≤n4≤1.730；53.4≤v4≤96.0；
1.402≤n5≤1.702；42.1≤v5≤60.0；
1.498≤n6≤1.710；17.0≤v6≤36.7；
1.425≤n7≤1.710；17.0≤v7≤60.0；
wherein n3, n4, n5, n6, and n7 sequentially represent refractive indexes of the third lens 103 to the seventh lens 204, respectively, and v3, v4, v5, v6, and v7 sequentially represent abbe numbers of the third lens 103 to the seventh lens 204, respectively.
The imaging effect of the zoom lens is improved by comprehensively setting parameters such as focal power, refractive index, abbe number and the like of each lens.
In order to make the zoom lens have a sufficient number of variations and be able to focus clearly, it is optional that the displacement amount g1_l of the first lens group 10 from the wide-angle end to the telephoto end, the displacement amount g2_l of the second lens group 20 from the wide-angle end to the telephoto end, and the total lens length ttl_w of the zoom lens at the wide-angle end satisfy:
0.13≤G1_L/TTL_W≤0.25；
0.07≤G2_L/TTL_W≤0.19。
in order to make the zoom lens have a larger imaging target surface, the optical system can be ensured to have better imaging quality, the picture is clearer, and optionally, the image surface diameter IC of the zoom lens and the focal length F_W of the zoom lens at the wide-angle end meet the following conditions:
F_W/IC≤0.51。
in order to ensure a sufficient installation space of the imaging sensor, optionally, the back focal length bfl_w of the zoom lens at the wide-angle end and the total lens length ttl_w of the zoom lens at the wide-angle end satisfy:
BFL_W/TTL_W≥0.10。
in order to avoid the aperture of the zoom lens being too large and meet the installation space requirement of the final product, optionally, the diameter D1 of the first lens 101 and the total lens length ttl_w of the zoom lens at the wide-angle end meet:
D1/TTL_W<0.58。
in order to ensure that the zoom lens can meet higher zoom magnification while having high imaging quality, optionally, the focal power of the zoom lens at the wide-angle endAnd optical power at the tele end +.>The method meets the following conditions:
optionally, the zoom lens further comprises a diaphragm 30; the diaphragm 30 is located between the third lens 103 and the fourth lens 201. The diaphragm 30 is additionally arranged to shield marginal rays, so that imaging quality is improved.
With continued reference to fig. 1, the zoom lens further includes a plate glass 40, the plate glass 40 being disposed on the image-side surface side of the seventh lens 204. By disposing the plate glass 40 with a certain thickness between the seventh lens 204 and the image plane, unwanted stray light can be filtered out while protecting, so that the imaging quality of the zoom lens is improved, for example, infrared light is filtered out by the plate glass 40 in daytime to improve the imaging quality of the zoom lens.
Exemplary, fig. 2 is a schematic structural diagram of a telephoto end of the zoom lens in fig. 1, and table 1 is specific parameters of the zoom lens corresponding to fig. 1 and 2:
table 1 specific parameters of zoom lens
Table 2 shows the design values of the specific parameters of the zoom lens shown in fig. 1 and 2:
table 2 design values of lens parameters of zoom lens
Wherein, the surface number 1 indicates the front surface (surface near the object side) of the first lens 101, the surface number 2 indicates the rear surface (surface near the image side) of the first lens 101, and so on; the surface numbers 16 and 17 denote the front surface and the rear surface of the lens cover glass, respectively. The radius of curvature indicates the degree of curvature of the lens surface, a positive value indicates that the surface is curved to the image plane side, and a negative value indicates that the surface is curved to the object plane side, wherein "infinite" indicates that the surface is planar and the radius of curvature is infinite; thickness denotes the center axial distance from the current surface to the next surface, radius of curvature and thickness are in millimeters, material (nd) denotes the refractive index, i.e., the ability of the material between the current surface and the next surface to deflect light, and material (vd) denotes the Abbe number, the dispersion characteristics of the material between the current surface and the next surface to light.
Table 3 is the zoom interval value in table 2:
TABLE 3 design value of zoom interval
Wide angle end Long focal end
Zoom interval 1 5.452 0.680
Zoom interval 2 3.240 6.410
Table 4 shows aspherical surface profile parameters in the zoom lens of fig. 1 and 2:
table 4 design value of aspherical coefficient in fixed focus lens
Wherein, -4.392853E-03 represents a of face number 3 2 Coefficients are-4.392853 ×10 -3 。
Fig. 3 is a graph of a spherical aberration at a wide-angle end of a zoom lens according to the present embodiment, and referring to fig. 3, spherical aberration of the zoom lens at different wavelengths (0.850 μm, 0.656 μm, 0.588 μm, 0.546 μm, 0.486 μm and 0.436 nm) is within 0.05mm, i.e. axial aberration of the zoom lens is small, so that it can be known that the zoom lens according to the present embodiment can correct aberration well at the wide-angle end.
Fig. 4 is a graph of spherical aberration at the telephoto end of the zoom lens according to the present embodiment, and referring to fig. 4, spherical aberration of the zoom lens at different wavelengths (0.850 μm, 0.656 μm, 0.588 μm, 0.546 μm, 0.486 μm and 0.436 nm) is within 0.1mm, i.e. axial aberration of the zoom lens is smaller, so that it is known that the zoom lens provided by the embodiment of the present invention can correct aberration well at the telephoto end.
Fig. 5 is a long Jiao Duanguang-line fan diagram of a zoom lens according to the present embodiment, and fig. 6 is a long Jiao Duanguang-line fan diagram of a zoom lens according to the present embodiment, wherein the abscissa represents the normalized entrance pupil, and the ordinate represents the deviation of light from the principal ray at the image plane.
Fig. 7 is a field curvature distortion diagram of a wide-angle end of a zoom lens according to the present embodiment, wherein the left side is a field curvature and the right side is a distortion. Referring to fig. 7, horizontal coordinates in the field curvature graph represent the magnitude of the field curvature in mm; the vertical coordinates represent the normalized image height without units; where T represents meridian and S represents arc loss. As can be seen from fig. 7, the zoom lens provided in the present embodiment is effectively controlled in curvature of field, that is, the difference between the image quality of the center and the image quality of the periphery is small at the time of imaging. The horizontal coordinates in the distortion graph represent the magnitude of distortion, expressed as a percentage; the vertical coordinates represent the normalized image height without units; as can be seen from fig. 7, the distortion of the zoom lens at the wide-angle end provided by the present embodiment is less than 70%.
Fig. 8 is a field curvature distortion diagram of a telephoto end of the zoom lens according to the present embodiment, wherein the left side is a field curvature and the right side is a distortion. Referring to fig. 8, horizontal coordinates in the field curvature graph represent the magnitude of the field curvature in mm; the vertical coordinates represent the normalized image height without units; where T represents meridian and S represents arc loss. As can be seen from fig. 8, the zoom lens provided in the present embodiment is effectively controlled in curvature of field, that is, the difference between the image quality of the center and the image quality of the periphery is small at the time of imaging. The horizontal coordinates in the distortion graph represent the magnitude of distortion, expressed as a percentage; the vertical coordinates represent the normalized image height without units; as can be seen from fig. 8, the distortion of the zoom lens at the wide-angle end provided in this embodiment is less than 14%, the imaging distortion is small, and the requirement of low distortion is satisfied.
In summary, as can be seen from fig. 3 to fig. 8, the zoom lens provided by the embodiment of the invention has good imaging capability.
Fig. 9 is a schematic structural diagram of a wide-angle end of another zoom lens according to an embodiment of the present invention, fig. 10 is a schematic structural diagram of a telephoto end of the zoom lens in fig. 9, and table 5 shows specific parameters of the zoom lens corresponding to fig. 9 and 10:
table 5 specific parameters of zoom lens
Table 6 shows the lens specific parameter design values of the zoom lens in fig. 9 and 10:
table 6 design values of lens parameters of zoom lens
Face number Surface type Radius of curvature Thickness of (L) Material (nd) Material (vd) Half diameter of
1 Spherical surface 49.843 0.836 1.750 53.8 5.65
2 Spherical surface 4.085 3.005 3.60
3 Aspherical surface -260.195 0.807 1.511 50.0 3.28
4 Aspherical surface 7.548 0.070 3.09
5 Aspherical surface 9.146 1.286 1.701 19.8 2.95
6 Aspherical surface 38.658 Zoom interval 1 2.96
Diaphragm Plane surface Infinite number of cases -0.380 2.90
8 Spherical surface 7.131 2.630 1.630 63.4 4.37
9 Spherical surface -28.723 0.068 4.37
10 Aspherical surface 5.947 2.457 1.502 60.0 2.90
11 Non-planar surface -5.825 0.205 2.86
12 Aspherical surface -3.014 0.927 1.678 26.7 2.81
13 Aspherical surface 16.419 0.731 2.50
14 Aspherical surface 3.343 3.000 1.525 56.5 3.18
15 Aspherical surface -37.646 Zoom interval 2 3.36
16 Plane surface Infinite number of cases 0.665 1.52 64.2 3.59
17 Plane surface Infinite number of cases 0.095 3.62
18 Image plane Infinite number of cases 3.53
Wherein, the surface number 1 indicates the front surface (surface near the object side) of the first lens 101, the surface number 2 indicates the rear surface (surface near the image side) of the first lens 101, and so on; the surface numbers 16 and 17 denote the front surface and the rear surface of the lens cover glass, respectively. The radius of curvature indicates the degree of curvature of the lens surface, a positive value indicates that the surface is curved to the image plane side, and a negative value indicates that the surface is curved to the object plane side, wherein "infinite" indicates that the surface is planar and the radius of curvature is infinite; thickness denotes the center axial distance from the current surface to the next surface, radius of curvature and thickness are in millimeters, material (nd) denotes the refractive index, i.e., the ability of the material between the current surface and the next surface to deflect light, and material (vd) denotes the Abbe number, the dispersion characteristics of the material between the current surface and the next surface to light.
Table 7 is the zoom interval value in table 2:
TABLE 7 design value of zoom interval
Table 8 shows aspherical surface profile parameters in the zoom lens of fig. 9 and 10:
table 8 design value of aspherical coefficient in fixed focus lens
Wherein, -6.809413E-04 represents a of face number 3 2 Coefficients are-6.809413 ×10 -4 。
Fig. 11 is a graph of a spherical aberration at a wide-angle end of a zoom lens according to the present embodiment, and referring to fig. 11, spherical aberration of the zoom lens at different wavelengths (0.850 μm, 0.656 μm, 0.588 μm, 0.546 μm, 0.486 μm, and 0.436 nm) is within 0.05mm, that is, axial aberration of the zoom lens is small, so that it can be known that the zoom lens according to the present embodiment can correct aberration well at the wide-angle end.
Fig. 12 is a graph of spherical aberration at the telephoto end of the zoom lens according to the present embodiment, and referring to fig. 12, spherical aberration of the zoom lens at different wavelengths (0.850 μm, 0.656 μm, 0.588 μm, 0.546 μm, 0.486 μm and 0.436 nm) is within 0.1mm, i.e. axial aberration of the zoom lens is smaller, so that it is known that the zoom lens provided by the embodiment of the present invention can correct aberration well at the telephoto end.
Fig. 13 is a long Jiao Duanguang-line fan diagram of a zoom lens according to the present embodiment, and fig. 14 is a long Jiao Duanguang-line fan diagram of a zoom lens according to the present embodiment, wherein the abscissa represents the normalized entrance pupil, and the ordinate represents the value of the deviation of light from the principal ray at the image plane.
Fig. 15 is a field curvature distortion diagram of a wide-angle end of a zoom lens according to the present embodiment, wherein the left side is a field curvature and the right side is a distortion. Referring to fig. 15, horizontal coordinates in the field curvature graph represent the magnitude of the field curvature in mm; the vertical coordinates represent the normalized image height without units; where T represents meridian and S represents arc loss. As can be seen from fig. 15, the zoom lens provided in the present embodiment is effectively controlled in curvature of field, that is, the difference between the image quality of the center and the image quality of the periphery is small at the time of imaging. The horizontal coordinates in the distortion graph represent the magnitude of distortion, expressed as a percentage; the vertical coordinates represent the normalized image height without units; as can be seen from fig. 15, the zoom lens provided in the present embodiment has a distortion of less than 70% at the wide-angle end.
Fig. 16 is a field curvature distortion diagram of a telephoto end of the zoom lens according to the present embodiment, wherein the left side is a field curvature and the right side is a distortion. Referring to fig. 16, horizontal coordinates in the field curvature graph represent the magnitude of the field curvature in mm; the vertical coordinates represent the normalized image height without units; where T represents meridian and S represents arc loss. As can be seen from fig. 16, the zoom lens provided in the present embodiment is effectively controlled in curvature of field, that is, the difference between the image quality of the center and the image quality of the periphery is small at the time of imaging. The horizontal coordinates in the distortion graph represent the magnitude of distortion, expressed as a percentage; the vertical coordinates represent the normalized image height without units; as can be seen from fig. 8, the distortion of the zoom lens at the wide-angle end provided in this embodiment is less than 16%, the imaging distortion is small, and the requirement of low distortion is satisfied.
In summary, as can be seen from fig. 11 to 16, the zoom lens provided by the embodiment of the invention has good imaging capability.
Fig. 17 is a schematic diagram of a structure of a wide-angle end of a zoom lens according to an embodiment of the present invention, fig. 18 is a schematic diagram of a telephoto end of the zoom lens shown in fig. 17, and table 9 shows specific parameters of the zoom lens corresponding to fig. 17 and 18:
table 9 specific parameters of zoom lens
Table 10 shows the lens specific parameter design values of the zoom lens in fig. 17 and 18:
table 10 design values of lens parameters of zoom lens
Wherein, the surface number 1 indicates the front surface (surface near the object side) of the first lens 101, the surface number 2 indicates the rear surface (surface near the image side) of the first lens 101, and so on; the surface numbers 16 and 17 denote the front surface and the rear surface of the lens cover glass, respectively. The radius of curvature indicates the degree of curvature of the lens surface, a positive value indicates that the surface is curved to the image plane side, and a negative value indicates that the surface is curved to the object plane side, wherein "infinite" indicates that the surface is planar and the radius of curvature is infinite; thickness denotes the center axial distance from the current surface to the next surface, radius of curvature and thickness are in millimeters, material (nd) denotes the refractive index, i.e., the ability of the material between the current surface and the next surface to deflect light, and material (vd) denotes the Abbe number, the dispersion characteristics of the material between the current surface and the next surface to light.
Table 11 is the zoom interval value in table 10:
table 10 a design value for zoom interval
Wide angle end Long focal end
Zoom interval 1 5.340 0.680
Zoom interval 2 3.840 7.455
Table 12 shows aspherical surface profile parameters in the zoom lens of fig. 17 and 18:
table 12 design value of aspherical coefficient in fixed focus lens
Wherein, -3.962468E-03 represents a of face number 3 2 Coefficients are-3.962468 ×10 -3 。
Fig. 19 is a graph of spherical aberration at the wide-angle end of a zoom lens according to the present embodiment, and referring to fig. 19, spherical aberration of the zoom lens at different wavelengths (0.850 μm, 0.656 μm, 0.588 μm, 0.546 μm, 0.486 μm, and 0.436 nm) is within 0.05mm, i.e., axial aberration of the zoom lens is small, so that it is known that the zoom lens according to the present embodiment can correct aberration well at the wide-angle end.
Fig. 20 is a graph of spherical aberration at the telephoto end of the zoom lens according to the present embodiment, and referring to fig. 20, spherical aberration of the zoom lens at different wavelengths (0.850 μm, 0.656 μm, 0.588 μm, 0.546 μm, 0.486 μm and 0.436 nm) is within 0.12mm, i.e. axial aberration of the zoom lens is smaller, so that it is known that the zoom lens provided by the embodiment of the present invention can correct aberration well at the telephoto end.
Fig. 21 is a long Jiao Duanguang-line fan diagram of a zoom lens according to the present embodiment, and fig. 22 is a long Jiao Duanguang-line fan diagram of a zoom lens according to the present embodiment, wherein the abscissa represents the normalized entrance pupil, and the ordinate represents the value of the deviation of light from the principal ray at the image plane.
Fig. 23 is a field curvature distortion diagram at the wide-angle end of the zoom lens according to the present embodiment, wherein the left side is the field curvature and the right side is the distortion. Referring to fig. 23, horizontal coordinates in the field curvature graph represent the magnitude of the field curvature in mm; the vertical coordinates represent the normalized image height without units; where T represents meridian and S represents arc loss. As can be seen from fig. 23, the zoom lens provided in the present embodiment is effectively controlled in curvature of field, that is, the difference between the image quality of the center and the image quality of the periphery is small at the time of imaging. The horizontal coordinates in the distortion graph represent the magnitude of distortion, expressed as a percentage; the vertical coordinates represent the normalized image height without units; as can be seen from fig. 23, the zoom lens provided in the present embodiment has a distortion of less than 70% at the wide-angle end.
Fig. 24 is a field curvature distortion diagram of a telephoto end of the zoom lens according to the present embodiment, wherein the left side is a field curvature and the right side is a distortion. Referring to fig. 24, horizontal coordinates in the field curvature graph represent the magnitude of the field curvature in mm; the vertical coordinates represent the normalized image height without units; where T represents meridian and S represents arc loss. As can be seen from fig. 24, the zoom lens provided in the present embodiment is effectively controlled in curvature of field, that is, the difference between the image quality of the center and the image quality of the periphery is small at the time of imaging. The horizontal coordinates in the distortion graph represent the magnitude of distortion, expressed as a percentage; the vertical coordinates represent the normalized image height without units; as can be seen from fig. 16, the distortion of the zoom lens at the wide-angle end provided in this embodiment is less than 16%, the imaging distortion is small, and the requirement of low distortion is satisfied.
In summary, as can be seen from fig. 19 to 24, the zoom lens provided by the embodiment of the invention has good imaging capability.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims (10)

1. A zoom lens characterized by comprising a first lens group of negative power and a second lens group of positive power arranged in order from an object side to an image side along an optical axis, a focal length of the zoom lens being changed by changing positions of the first lens group and the second lens group on the optical axis;
the first lens group comprises a first lens, a second lens and a third lens which are sequentially arranged from the object side to the image side along the optical axis;
the second lens group comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from the object side to the image side along the optical axis;
the first lens has negative optical power, the second lens has negative optical power, the third lens has positive optical power, the fourth lens has positive optical power, the fifth lens has positive optical power, the sixth lens has negative optical power, and the seventh lens has positive optical power.
2. The zoom lens according to claim 1, wherein the first lens is a convex-concave glass spherical lens, the second lens is a biconcave plastic aspherical lens, the third lens is a convex-concave or biconvex plastic aspherical lens, the fourth lens is a biconvex glass spherical lens, the fifth lens is a biconvex plastic aspherical lens, the sixth lens is a biconcave plastic aspherical lens, and the seventh lens is a biconvex or convex-concave plastic aspherical lens.
3. The zoom lens of claim 1, wherein the powers of the first lens to the seventh lens satisfy:
wherein , andRespectively represent the optical powers of the first lens to the seventh lens,representing the optical power of said first lens group, < >>Representing the optical power of the second lens group.
4. The zoom lens according to claim 1, wherein refractive indices and dispersion coefficients of the third lens to the seventh lens satisfy:
1.497≤n3≤1.710；17.0≤v3≤20.8；
1.400≤n4≤1.730；53.4≤v4≤96.0；
1.402≤n5≤1.702；42.1≤v5≤60.0；
1.498≤n6≤1.710；17.0≤v6≤36.7；
1.425≤n7≤1.710；17.0≤v7≤60.0；
wherein n3, n4, n5, n6 and n7 sequentially represent refractive indexes of the third lens to the seventh lens, respectively, and v3, v4, v5, v6 and v7 sequentially represent abbe numbers of the third lens to the seventh lens, respectively.
5. The zoom lens according to claim 1, wherein a displacement amount g1_l of the first lens group from the wide-angle end to the telephoto end, a displacement amount g2_l of the second lens group from the wide-angle end to the telephoto end, and a total lens length ttl_w of the zoom lens at the wide-angle end satisfy:
0.13≤G1_L/TTL_W≤0.25；
0.07≤G2_L/TTL_W≤0.19。
6. the zoom lens according to claim 1, wherein an image plane diameter IC of the zoom lens and a focal length f_w of the zoom lens at a wide angle end satisfy:
F_W/IC≤0.51。
7. the zoom lens according to claim 1, wherein a back focal length bfl_w of the zoom lens at a wide angle end and a total lens length ttl_w of the zoom lens at a wide angle end satisfy:
BFL_W/TTL_W≥0.10。
8. the zoom lens according to claim 1, wherein a diameter D1 of the first lens and a total lens length ttl_w of the zoom lens at a wide angle end satisfy:
D1/TTL_W<0.58。
9. the zoom lens according to claim 1, wherein an optical power of the zoom lens at a wide-angle endAnd optical power at the tele end +.>The method meets the following conditions:
10. the zoom lens of claim 1, further comprising a stop;
the diaphragm is positioned between the third lens and the fourth lens.
CN202210171280.7A 2022-02-24 2022-02-24 Zoom lens Pending CN116699816A (en)

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KR1020237023219A KR20230129021A (en) 2022-02-24 2023-02-23 zoom lens

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Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10170825A (en) * 1996-12-13 1998-06-26 Nikon Corp Compact zoom lens
JP2008310133A (en) * 2007-06-15 2008-12-25 Konica Minolta Opto Inc Variable power optical system, imaging apparatus and digital equipment
JP5265218B2 (en) * 2008-02-26 2013-08-14 株式会社タムロン Zoom lens
JP2011248049A (en) * 2010-05-26 2011-12-08 Hoya Corp Zoom lens system
JP5774055B2 (en) * 2013-05-23 2015-09-02 キヤノン株式会社 Zoom lens and imaging apparatus having the same
JP6628240B2 (en) * 2015-08-10 2020-01-08 キヤノン株式会社 Zoom lens and imaging device having the same
CN110262021B (en) * 2019-06-20 2024-07-30 东莞市宇瞳光学科技股份有限公司 Zoom lens
CN216927244U (en) * 2022-02-24 2022-07-08 东莞市宇瞳光学科技股份有限公司 Zoom lens

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