CN109143555B - Zoom lens - Google Patents

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Publication number
CN109143555B
CN109143555B CN201811062993.XA CN201811062993A CN109143555B CN 109143555 B CN109143555 B CN 109143555B CN 201811062993 A CN201811062993 A CN 201811062993A CN 109143555 B CN109143555 B CN 109143555B
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lens
zoom
positive
group
zoom lens
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CN109143555A (en
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刘凯
林法官
丁洪兴
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Zhejiang Dahua Technology Co Ltd
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Zhejiang Dahua Technology 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
    • G02B15/16—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
    • 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
    • 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
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses

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

Abstract

The invention discloses a zoom lens, which is used for improving the matching degree of product performance and product structure on the basis of improving resolution. A zoom lens, comprising: first fixed lens group, the zoom lens group, the fixed lens group of second and the compensation lens group that set gradually along light incident direction, wherein: the total focal power of the second fixed lens group is positive, the total focal power of the compensation lens group is positive, and the zoom lens group and the compensation lens group can move along the optical axis direction; the first fixed lens group comprises a first lens, a second lens, a third lens and a fourth lens which are arranged in sequence along the direction from the object side to the image side; the first lens is a negative focal power lens, the second lens is a positive focal power lens, the third lens is a positive focal power lens, and the fourth lens is a positive focal power lens.

Description

Zoom lens
Technical Field
The invention relates to the technical field of optical equipment, in particular to a zoom lens.
Background
At present, monitoring of occasions such as large squares, roads or forest protection requires global overview and also requires that the enlarged locking tracking of a focus target can be realized. There is a need for a high power zoom lens that can automatically zoom with both wide and telephoto angles.
Existing zoom lens optical structures have 2-component and typically have 3 or more groups of multiple components, where the 2-component structure has a smaller volume but a magnification of typically less than 4.5 times, and the multiple-component structure typically has a magnification of 10 or more, for example, a 4-group structure can also achieve a magnification of 20 or more.
The conventional common high-magnification zoom lens can meet the high definition requirement, is usually overlong in total length and large in size, and is difficult to adapt to the requirement of a miniaturized hemispherical movement product; and the zoom lens with the volume meeting the requirement has small zoom magnification or low pixel.
Disclosure of Invention
The embodiment of the invention aims to provide a zoom lens, which is used for improving the matching degree of product performance and product structure on the basis of improving the resolution.
An embodiment of the present invention provides a zoom lens, including: first fixed lens group, the zoom lens group, the fixed lens group of second and the compensation lens group that set gradually along light incident direction, wherein:
the total focal power of the second fixed lens group is positive, the total focal power of the compensation lens group is positive, and both the zoom lens group and the compensation lens group can move along the optical axis direction;
the first fixed lens group comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along the direction from the object side to the image side; the first lens is a negative focal power lens, the second lens is a positive focal power lens, the third lens is a positive focal power lens, and the fourth lens is a positive focal power lens.
In the embodiment of the invention, optionally, the focal length f of the zoom lens group1', focal length f of said compensation lens group2' with the focal length f of the zoom lens in the short-focus statew' satisfies:
-2.1<f1'/fw'<-1；
3.8<f2'/fw'<4.8。
in any embodiment of the present invention, optionally, a surface of the first lens element facing the image side is a concave surface, a surface of the second lens element facing the object side is a convex surface, a surface of the third lens element facing the object side is a convex surface, and a surface of the fourth lens element facing the image side is a concave surface.
In the embodiment of the present invention, optionally, the zoom lens group includes a fifth lens, a sixth lens and a seventh lens, which are sequentially disposed in a direction from the object side to the image side, where the fifth lens is a negative power lens, the sixth lens is a negative power lens, and the seventh lens is a positive power lens.
In any embodiment of the present invention, optionally, a surface of the fifth lens element facing the image side is a concave surface, a surface of the sixth lens element facing the object side and a surface of the sixth lens element facing the image side are both convex surfaces, and a surface of the seventh lens element facing the object side is a concave surface.
In an embodiment of the present invention, optionally, the sixth lens element is made of glass, and an abbe number Vd32 of the sixth lens element satisfies: vd32 is more than or equal to 70.
In any embodiment of the present invention, optionally, the second fixed lens group includes an eighth lens, a ninth lens, a tenth lens, and an eleventh lens, which are sequentially disposed in a direction from the object side to the image side, where the eighth lens is a positive power lens, the ninth lens is a positive power lens, the tenth lens is a positive power lens, and the eleventh lens is a negative power lens.
In an embodiment of the invention, optionally, the eighth lens element is a lens subgroup including at least one aspheric lens element with positive optical power, a surface of the ninth lens element facing the object side and a surface of the ninth lens element facing the image side are both convex surfaces, a surface of the tenth lens element facing the object side and a surface of the eleventh lens element facing the image side are both convex surfaces, and a surface of the eleventh lens element facing the object side and a surface of the eleventh lens element facing the image side are both concave surfaces.
In any embodiment of the present invention, optionally, the tenth lens is made of glass, and an abbe number Vd43 of the tenth lens satisfies: vd43 is more than or equal to 66;
the eleventh lens is made of glass, and the refractive index nd44 of the eleventh lens meets the following requirements: nd44 is more than or equal to 1.8.
In the embodiment of the present invention, optionally, the compensation lens group includes a twelfth lens and a thirteenth lens which are sequentially disposed in an object-side to image-side direction, where the twelfth lens is a positive power lens, and the thirteenth lens is a negative power lens.
In any embodiment of the present invention, optionally, the twelfth lens element is an aspheric lens element, and a surface of the thirteenth lens element facing the object side is a concave surface.
In an embodiment of the present invention, optionally, the twelfth lens element is made of glass, and an abbe number Vd51 of the twelfth lens element satisfies: vd51 is greater than or equal to 66.
In any embodiment of the present invention, optionally, the aspheric lens is made of glass or plastic.
In an embodiment of the present invention, optionally, the zoom lens further includes an aperture stop disposed between the zoom lens group and the second fixed lens group.
In the zoom lens according to the present embodiment, the first fixed lens group includes a first lens, a second lens, a third lens, and a fourth lens that are sequentially disposed in a direction from the object side to the image side; the first lens is a negative focal power lens, the second lens is a positive focal power lens, the third lens is a positive focal power lens, the fourth lens is a positive focal power lens, the focal length is changed by the movement of the second fixed lens group along the optical axis, and a position can be found by the matched movement of the compensation lens group along the optical axis, so that the position of an image surface is unchanged, and the image formation is clear. Compared with the prior art, the zoom lens of the technical scheme can well control the maximum length of the system, so that the product performance and the appearance size are well matched, and the zoom lens can be widely applied to the technical fields of security monitoring and the like.
Drawings
FIG. 1 is a schematic structural diagram of a zoom lens according to an embodiment of the present invention;
FIG. 2-1 is a graph of an optical transfer function in the visible light portion in the short focus state of the zoom lens according to the embodiment of the present invention;
fig. 2-2 is a graph of an optical transfer function in the visible portion of a zoom lens in a telephoto state according to an embodiment of the present invention;
FIG. 3-1 is a curved field plot of the visible light portion in the short focus state of the zoom lens according to the embodiment of the present invention;
3-2 are graphs of field curvature of the visible portion of the zoom lens in focus for embodiments of the present invention;
FIG. 4-1 is a graph of axial chromatic aberration in the visible light portion in the short focus state of the zoom lens according to the embodiment of the present invention;
fig. 4-2 is a graph of axial chromatic aberration in the visible portion of the zoom lens in the telephoto state according to the embodiment of the present invention;
FIG. 5-1 is a vertical axis chromatic aberration curve diagram of the visible light portion in the short focus state of the zoom lens according to the embodiment of the present invention;
fig. 5-2 is a vertical axis chromatic aberration diagram of a visible light portion in a telephoto state of the zoom lens according to an embodiment of the present invention.
Reference numerals:
1-a zoom lens;
2-a first fixed lens group;
21-a first lens;
22-a second lens;
23-a third lens;
24-a fourth lens;
3-a zoom lens group;
31-a fifth lens;
32-a sixth lens;
33-a seventh lens;
4-a second fixed lens group;
41-eighth lens;
42-ninth lens;
43-tenth lens;
44-eleventh lens;
5-a compensation lens group;
51-twelfth lens;
52-twelfth lens;
6-aperture diaphragm;
7-an optical filter;
8-image plane.
Detailed Description
In order to improve the matching degree of product performance and product structure on the basis of improving resolution, the embodiment of the invention provides a zoom lens. In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by referring to the following examples.
When the present application refers to the ordinal numbers "first", "second", "third" or "fourth", etc., it should be understood that this is done for differentiation only, unless it is clear from the context that the order is actually expressed.
As shown in fig. 1, an embodiment of the present invention provides a zoom lens 1 including: first fixed lens group 2, zoom lens group 3, second fixed lens group 4 and compensation lens group 5 that set gradually along the light incidence direction, wherein:
the total focal power of the second fixed lens group 4 is positive, the total focal power of the compensation lens group 5 is positive, and the zoom lens group 3 and the compensation lens group 5 can move along the optical axis direction;
focal length f of the variable focus lens package 31', focal length f of compensation lens group 52' focal length f of zoom lens 1 in short focal statew' satisfies:
-2.1<f1'/fw'<-1；
3.8<f2'/fw'<4.8。
in the embodiment of the present invention, the object side refers to a side where an object photographed by the zoom lens is located, and the image side refers to a side where the object forms an image in the zoom lens.
Further, as shown in fig. 1, in the embodiment of the present invention, the four groups of lenses, namely the first fixed lens group 2, the zoom lens group 3, the second fixed lens group 4 and the compensation lens group 5, are arranged in order from the object side to the image side, specifically:
first fixed lens group 2: the total optical power is positive, and comprises the following components in sequence from the object side to the image side:
first lens 21: the focal power is negative, and the surface of the focal power facing the image side is a concave surface;
second lens 22: the focal power is positive, and the surface thereof facing the object side is convex;
third lens 23: the focal power is positive, and the surface thereof facing the object side is convex;
fourth lens 24: the focal power is positive, and the surface of the optical power facing the object side is a concave surface;
the zoom lens group 3: the total optical power is negative, and comprises the following components in sequence from the object side to the image side:
fifth lens 31: the focal power is negative, and the surface of the focal power facing the image side is a concave surface;
sixth lens 32: the focal power is negative, and the surface of the optical power facing the object side is a convex surface;
seventh lens 33: the focal power is positive, and the surface of the optical power facing the object side is a concave surface;
second fixed lens group 4: the total optical power is positive, and comprises the following components in sequence from the object side to the image side:
eighth lens 41: a lens subgroup comprising at least one aspheric lens having a positive optical power;
ninth lens 42: the focal power is positive, and the surface facing to the object side and the surface facing to the image side are convex surfaces;
tenth lens 43: the focal power is positive, and the surface facing to the object side and the surface facing to the image side are convex surfaces;
eleventh lens 44: the focal power is negative, and the surface facing the object side and the surface facing the image side are both concave surfaces;
compensation lens group 5: the total optical power is positive, and comprises the following components in sequence from the object side to the image side:
twelfth lens 51: an aspherical lens having a negative focal power;
thirteenth lens 52: the power is negative and its surface facing the object side is concave.
In any embodiment of the present invention, the aspheric lens is made of glass or plastic.
This allows a certain degree of freedom in the variation of the coefficients characterizing the aspherical shape while allowing the overall optical angle of the lens group including the aspherical mirror to be within the limits of the present application.
As described above, in the embodiment of the present invention, when the material of the sixth lens element 32 is glass, the abbe number Vd32 of the sixth lens element 32 satisfies: vd32 is more than or equal to 70.
When the tenth lens 43 is made of glass, the abbe number Vd43 of the tenth lens 43 satisfies: vd43 is greater than or equal to 66.
When the eleventh lens 44 is made of glass, the refractive index nd44 of the eleventh lens 44 satisfies: nd44 is more than or equal to 1.8.
When the twelfth lens 51 is made of glass, the abbe number Vd51 of the twelfth lens 51 satisfies: vd51 is greater than or equal to 66.
Further, as shown in fig. 1, in the embodiment of the present invention, optionally, the zoom lens 1 further includes an aperture stop 6 disposed between the zoom lens group 3 and the second fixed lens group 4.
By arranging the aperture stop 6 between the zoom lens group 3 and the second fixed lens group 4, the aperture and the position of the light beam entering the zoom lens 1 system can be effectively controlled.
As shown in fig. 1, in the embodiment of the present invention, the zoom lens 1 may further include an optical filter 7 and an image plane 8, which are sequentially disposed on the image side of the compensation lens group 5.
The following is a detailed description of the present application with respect to lenses provided in accordance with the present application:
the curvature radius R, the center thickness Tc, the refractive index Nd and the abbe number Vd of each lens of the zoom lens are shown in table 1:
Figure BDA0001797588380000071
Figure BDA0001797588380000081
Figure BDA0001797588380000091
TABLE 1
The mirror surfaces corresponding to the 12 th, 13 th, 24 th and 25 th surfaces can be expressed by relations between the rise Z and the caliber Y, R value, the cone coefficient K, the multiple term coefficients A4, A6, A8, A10, A12, A14 and A16:
Z＝[(1/R)2Y]/1+[1-(1+k)(1/R)2Y2]1/2+A4Y4+A6Y6+A8Y8+A10Y10+A12Y12+A14Y14+A16Y16
calculated, coefficients for the 14 th plane:
K＝-1.06602；A4＝-3.0194886e-006；A6＝-3.0736896e-008；
A8＝2.2923843e-008；A10＝-1.126297e-009；A12＝4.2787454e-012；
A14＝3.7809138e-013；A16＝-5.2449137e-015；
coefficient of the 15 th plane:
K＝-15.86098；A4＝7.466835e-005；A6＝-7.3398369e-007；
A8＝7.4809103e-008；A10＝-3.8301604e-009；A12＝8.3381621e-011；
A14＝-8.0595287e-013；A16＝1.7502908e-015；
coefficient of the 21 st plane:
K＝-0.012620；A4＝-8.3637147e-007；A6＝-2.8385117e-008；
A8＝0；A10＝0；A12＝0；A14＝0；A16＝0；
coefficient of 22 th plane:
K＝0.031206；A4＝-5.5076144e-008；A6＝-1.2965681e-007；
A8＝0；A10＝0；A12＝0；A14＝0；A16＝0。
the lens provided by the embodiment has the following optical technical indexes:
the optical total length TT L is less than or equal to 88 mm;
focal length f' of the lens: 5(W) -110 (T) mm;
angle of view of lens: 67.2 ° (W) -3.1 ° (T);
optical distortion of the lens: -8% (W) — + 1% (T);
aperture fno of lens system: f1.6(W) -F4.0 (T);
size of a lens image plane: 1/3'.
Note: w represents short focus, and T represents long focus.
The zoom lens provided by the embodiment of the present application is further analyzed by an optical transfer function as follows:
the optical transfer function is used for evaluating the imaging quality of a zoom lens in a more accurate, visual and common mode, the higher and smoother curve of the optical transfer function shows that the imaging quality of the system is better, and various aberrations (such as spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical axis chromatic aberration and the like) are well corrected.
As shown in fig. 2, which is a graph of the optical transfer function (MTF) in the visible light band, it can be seen from fig. 2-1 that the optical transfer function curve in the visible light portion of the zoom lens in the short focus state is relatively smooth and concentrated, and the average MTF value in the full field of view (half image height Y ═ 3mm) is 0.65 or more; as can be seen from fig. 2-2, the optical transfer function (MTF) graph of the visible light portion of the zoom lens in the telephoto state is relatively smooth and concentrated, and the average MTF value of the full field of view (half-image height Y ═ 3mm) is close to 0.5; therefore, the zoom lens provided by the embodiment can achieve high resolution and meet the imaging requirement of a camera with 1/3 inches and 300 ten thousand pixels.
As shown in fig. 3-1 and 3-2, the curvature of field corresponding to the visible light portion of the zoom lens is composed of three curves T and three curves S; wherein, the three curves T respectively represent the aberration of the meridional beams (tagential Rays) corresponding to the three wavelengths (486nm, 587nm and 656nm), the three curves S respectively represent the aberration of the sagittal beams (Sagittial Rays) corresponding to the three wavelengths (486nm, 587nm and 656nm), and the smaller the meridional field curvature value and the sagittal field curvature value are, the better the imaging quality is. As shown in FIG. 3-1, the meridian field curvature value in the short-focus state is controlled within the range of-0.02 to-0.001 mm, and the sagittal field curvature value is controlled within the range of-0.014 to 0.01 mm; as shown in FIG. 3-2, the meridian field curvature value in the telephoto state is controlled within the range of-0.06-0.019 mm, and the sagittal field curvature value is controlled within the range of-0.027-0.046 mm.
4-1 and 4-2, the axial chromatic aberration diagram corresponding to the visible light part of the zoom lens, in which the curve changes near the y-axis, the closer to the y-axis, the better the imaging quality of the zoom lens is. As shown in FIG. 4-1, the axial chromatic aberration in the short focus state is controlled between-0.04 mm and +0.014 mm; as shown in FIG. 4-2, the axial chromatic aberration in the tele state is controlled to be between-0.038 and +0.055 mm.
5-1 and 5-2, the curve in the vertical axis chromatic aberration diagram corresponding to the visible light part of the zoom lens is closer to the y axis, which shows that the imaging quality of the zoom lens is better. As shown in FIG. 5-1, the vertical axis chromatic aberration in the short focus state is controlled to be between-0.0005 and +0.0024 mm; as shown in FIG. 5-2, the vertical axis chromatic aberration in the telephoto state is controlled to be between-0.0032 and +0.00025 mm.
In summary, the embodiment of the invention provides a zoom lens with large magnification, large aperture and high resolution. The zoom lens adopts four lens groups and thirteen optical lenses with specific structural shapes, the optical lenses are sequentially arranged from the object side to the image side according to a specific sequence, and through the distribution of the focal power of each optical lens, the aspheric lens and the adaptive optical glass material are adopted, so that the structural form of the zoom lens, the refractive index, the Abbe coefficient and other parameters of the lenses are matched with the imaging conditions. Thereby the spherical aberration, the coma aberration, the astigmatism, the field curvature, the vertical axis chromatic aberration and the axial chromatic aberration of the zoom lens are well corrected; therefore, on the premise of larger image surface, the requirements of large multiplying power, large aperture and high resolution are met, and better imaging performance under a low-illumination environment can be realized; it is worth mentioning that the zoom lens of the technical scheme can well control the maximum length of the zoom lens system, so that the product performance and the overall dimension are well matched; therefore, the method can be widely applied to the fields of security monitoring and the like.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (13)

1. A zoom lens, comprising: first fixed lens group, the zoom lens group, the fixed lens group of second and the compensation lens group that set gradually along light incident direction, wherein:
the total focal power of the second fixed lens group is positive, the total focal power of the compensation lens group is positive, and both the zoom lens group and the compensation lens group can move along the optical axis direction;
the first fixed lens group comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along the direction from the object side to the image side; the first lens is a negative focal power lens, the second lens is a positive focal power lens, the third lens is a positive focal power lens, and the fourth lens is a positive focal power lens;
the second fixed lens group comprises an eighth lens, a ninth lens, a tenth lens and an eleventh lens which are sequentially arranged along the direction from the object side to the image side, wherein the eighth lens is a positive focal power lens, the ninth lens is a positive focal power lens, the tenth lens is a positive focal power lens, and the eleventh lens is a negative focal power lens;
w represents short focus, T represents long focus, and the zoom lens has the following optical technical indexes:
the optical total length TT L is less than or equal to 88 mm;
focal length f' of the lens: 5(W) -110 (T) mm;
angle of view of lens: 67.2 ° (W) -3.1 ° (T);
optical distortion of the lens: -8% (W) — + 1% (T);
aperture fno of lens system: f1.6(W) -F4.0 (T);
size of a lens image plane: 1/3'.
2. The zoom lens of claim 1, wherein the focal length f of the zoom lens group1', focal length f of said compensation lens group2' with the focal length f of the zoom lens in the short-focus statew' satisfies:
-2.1<f1'/fw'<-1；
3.8<f2'/fw'<4.8。
3. the zoom lens according to claim 1, wherein a surface of the first lens element facing the image side is a concave surface, a surface of the second lens element facing the object side is a convex surface, a surface of the third lens element facing the object side is a convex surface, and a surface of the fourth lens element facing the image side is a concave surface.
4. The zoom lens according to claim 1, wherein the zoom lens group comprises a fifth lens, a sixth lens and a seventh lens which are arranged in this order from the object side to the image side, the fifth lens is a negative power lens, the sixth lens is a negative power lens, and the seventh lens is a positive power lens.
5. The zoom lens according to claim 4, wherein a surface of the fifth lens element facing the image side is a concave surface, surfaces of the sixth lens element facing the object side and the image side are both convex surfaces, and a surface of the seventh lens element facing the object side is a concave surface.
6. The zoom lens according to claim 4, wherein the sixth lens is made of glass, and an abbe number Vd32 of the sixth lens satisfies: vd32 is more than or equal to 70.
7. The zoom lens according to claim 1, wherein the eighth lens is a lens subgroup including at least one aspheric lens having a positive refractive power, a surface of the ninth lens facing the object side and a surface of the ninth lens facing the image side are both convex surfaces, a surface of the tenth lens facing the object side and a surface of the tenth lens facing the image side are both convex surfaces, and a surface of the eleventh lens facing the object side and a surface of the eleventh lens facing the image side are both concave surfaces.
8. The zoom lens according to claim 1, wherein the tenth lens is made of glass, and an abbe number Vd43 of the tenth lens satisfies: vd43 is more than or equal to 66;
the eleventh lens is made of glass, and the refractive index nd44 of the eleventh lens meets the following requirements: nd44 is more than or equal to 1.8.
9. The zoom lens according to claim 1, wherein the compensation lens group includes a twelfth lens and a thirteenth lens which are arranged in this order in an object-side to image-side direction, the twelfth lens being a positive power lens, the thirteenth lens being a negative power lens.
10. The zoom lens according to claim 9, wherein the twelfth lens is an aspherical lens, and a surface of the thirteenth lens directed toward the object side is a concave surface.
11. The zoom lens according to claim 9, wherein the twelfth lens is made of glass, and an abbe number Vd51 of the twelfth lens satisfies: vd51 is greater than or equal to 66.
12. The zoom lens according to claim 7 or 10, wherein the aspheric lens is made of glass or plastic.
13. The zoom lens of claim 1, further comprising an aperture stop disposed between the zoom lens group and the second fixed lens group.
CN201811062993.XA 2018-09-12 2018-09-12 Zoom lens Active CN109143555B (en)

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CN111880296A (en) * 2020-08-12 2020-11-03 江西特莱斯光学有限公司 Large-range zoom lens
CN113885184B (en) * 2021-10-08 2022-04-22 嘉兴中润光学科技股份有限公司 Long-focus zoom lens and image pickup device

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