CN212658888U - Zoom lens group - Google Patents

Zoom lens group Download PDF

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CN212658888U
CN212658888U CN202021761933.XU CN202021761933U CN212658888U CN 212658888 U CN212658888 U CN 212658888U CN 202021761933 U CN202021761933 U CN 202021761933U CN 212658888 U CN212658888 U CN 212658888U
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lens
lens group
zoom
curvature
radius
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张健
胡亚斌
戴付建
赵烈烽
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Abstract

The present application discloses a zoom lens assembly, sequentially comprising, from an object side to an image side along an optical axis: a first lens group having optical power, including a first lens; a second lens group having positive refractive power, which includes a second lens, a diaphragm, a third lens, a fourth lens, and a fifth lens arranged in this order along an optical axis; a third lens group having negative power, which includes a sixth lens having positive power, and a seventh lens, arranged in order along the optical axis; a fourth lens group having power, including an eighth lens; wherein, an air space is arranged between any two adjacent lenses; intervals among the first lens group, the second lens group, the third lens group and the fourth lens group are variable to achieve continuous zooming of the zoom lens groups.

Description

Zoom lens group
Technical Field
The present application relates to the field of optical elements, and in particular, to a zoom lens group.
Background
In recent years, with the rapid development of portable electronic devices such as smartphones and tablet computers, people are pursuing good performance and ultra-thinness of portable electronic devices such as smartphones and tablet computers, and the requirements for imaging performance of miniaturized cameras are increasing.
At present, the application of the zoom function of a miniaturized camera by people is more and more common, and a lens which can only realize the change of a plurality of specific focal length values cannot meet the requirements of people. In order to enable users to have better photographing experience, a lens with a continuous zooming function is a new development trend.
SUMMERY OF THE UTILITY MODEL
The application provides an eight-piece zoom lens with an aspheric surface, which realizes a continuous zooming function through the movement of a lens group and has good imaging quality in a zooming process.
An aspect of the present application provides a zoom lens assembly, in order from an object side to an image side along an optical axis, comprising: a first lens group having optical power, including a first lens; a second lens group having positive refractive power, which includes a second lens, a diaphragm, a third lens, a fourth lens, and a fifth lens arranged in this order along an optical axis; a third lens group having negative power, which includes a sixth lens having positive power, and a seventh lens, arranged in order along the optical axis; a fourth lens group having power, including an eighth lens; wherein, an air space is arranged between any two adjacent lenses; intervals among the first lens group, the second lens group, the third lens group and the fourth lens group are variable to achieve continuous zooming of the zoom lens groups.
In one embodiment, an on-axis distance TTL from an object side surface to an imaging surface of the first lens and an entrance pupil diameter EPD at different zoom factorsWSatisfies the following conditions: 4.5<TTL/EPDW<7.0。
In one embodiment, the total effective focal length f of the zoom lens group at different zoom factorsWAir space T78 on optical axis between seventh lens and eighth lens at different zoom magnificationsWSatisfies the following conditions: 2.5<fW/T78W<52.0。
In one embodiment, the total effective focal length f of the zoom lens group at different zoom factorsWWith the entrance pupil diameter EPD at different zoom factorsWSatisfies the following conditions: 2.5<fW/EPDW<4.5。
In one embodiment, the radius of curvature R2 of the first lens surface side and the radius of curvature R3 of the second lens surface side satisfy: 2.0< R2/R3< 6.5.
In one embodiment, the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R5 of the object-side surface of the third lens satisfy: 1.0< R4/R5< 2.0.
In one embodiment, a radius of curvature R7 of the object-side surface of the fourth lens, a radius of curvature R9 of the object-side surface of the fifth lens, a radius of curvature R10 of the image-side surface of the fifth lens, and a radius of curvature R11 of the object-side surface of the sixth lens satisfy: -3.5< R11/(R7+ R9+ R10) < 3.0.
In one embodiment, a radius of curvature R12 of the image-side surface of the sixth lens and a radius of curvature R13 of the object-side surface of the seventh lens satisfy: 1.0< R13/R12< 2.0.
In one embodiment, the maximum field angle | FOV of the zoom lens group at different zoom magnificationsWI satisfies: 15 degree<|FOVW|<35°。
In one embodiment, a radius of curvature R14 of the image-side surface of the seventh lens, a radius of curvature R15 of the object-side surface of the eighth lens, and a radius of curvature R16 of the image-side surface of the eighth lens satisfy: 1.0< | R15+ R16|/R14< 7.5.
In one embodiment, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 1.0< f3/f2< 2.0.
In one embodiment, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: 2.0< f6/f5< 3.0.
In one embodiment, the air space T12 on the optical axis of the first lens and the second lens under different zoom factorsWAir space T56 on optical axis between fifth lens and sixth lens under different zoom factorsWSatisfies the following conditions: t12 not less than 1.0W/T56W<3.5。
In one embodiment, the fourth lens group moves in the optical axis direction relative to the first lens group; focusing stroke S of the first lens group and the fourth lens group after the object distance is from infinity to 1 m at different zooming times3X-5XSatisfies the following conditions: 0.5<|S3X-5X| ≤1.5。
In one embodiment, the combined focal length f of the second lens groupG2Combined focal length f with third lens groupG3Satisfies the following conditions: -2.5<fG3/fG2<-0.5。
Another aspect of the present application provides a zoom lens assembly, in order from an object side to an image side along an optical axis, comprising: a first lens group having optical power, including a first lens; a second lens group having a refractive power, which includes a second lens, a stop, a third lens, a fourth lens, and a fifth lens arranged in this order along an optical axis; a third lens group having a focal power, which includes a sixth lens having a positive focal power, and a seventh lens, which are arranged in order along the optical axis; a fourth lens group having power, including an eighth lens; wherein, an air space is arranged between any two adjacent lenses; intervals among the first lens group, the second lens group, the third lens group and the fourth lens group are variable to realize continuous zooming of the zoom lens groups; on-axis distance TTL from object side surface of first lens to imaging surface and entrance pupil diameter EPD under different zoom factorsWSatisfies the following conditions: 4.5<TTL/EPDW<7.0。
In one embodiment, the total effective focal length f of the zoom lens group at different zoom factorsWAir space T78 on optical axis between seventh lens and eighth lens at different zoom magnificationsWSatisfies the following conditions: 2.5<fW/T78W<52.0。
In one embodiment, the second lens group has positive optical power and the third lens group has negative optical power.
In one embodiment, the total effective focal length f of the zoom lens group at different zoom factorsWWith the entrance pupil diameter EPD at different zoom factorsWSatisfies the following conditions: 2.5<fW/EPDW<4.5。
In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R3 of the object-side surface of the second lens satisfy: 2.0< R2/R3< 6.5.
In one embodiment, the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R5 of the object-side surface of the third lens satisfy: 1.0< R4/R5< 2.0.
In one embodiment, a radius of curvature R7 of the object-side surface of the fourth lens, a radius of curvature R9 of the object-side surface of the fifth lens, a radius of curvature R10 of the image-side surface of the fifth lens, and a radius of curvature R11 of the object-side surface of the sixth lens satisfy: -3.5< R11/(R7+ R9+ R10) < 3.0.
In one embodiment, a radius of curvature R12 of the image-side surface of the sixth lens and a radius of curvature R13 of the object-side surface of the seventh lens satisfy: 1.0< R13/R12< 2.0.
In one embodiment, the maximum field angle | FOV of the zoom lens group at different zoom magnificationsWI satisfies: 15 degree<|FOVW|<35°。
In one embodiment, a radius of curvature R14 of the image-side surface of the seventh lens, a radius of curvature R15 of the object-side surface of the eighth lens, and a radius of curvature R16 of the image-side surface of the eighth lens satisfy: 1.0< | R15+ R16|/R14< 7.5.
In one embodiment, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 1.0< f3/f2< 2.0.
In one embodiment, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: 2.0< f6/f5< 3.0.
In one embodiment, the air space T12 on the optical axis of the first lens and the second lens under different zoom factorsWAir space T56 on optical axis between fifth lens and sixth lens under different zoom factorsWSatisfies the following conditions: t12 not less than 1.0W/T56W<3.5。
In one embodiment, the fourth lens group moves in the optical axis direction relative to the first lens group;
different zoom timesFocusing stroke S of the rear first lens group and the fourth lens group when the object distance is from infinity to 1 m at high speed3X-5XSatisfies the following conditions: 0.5<|S3X-5X|≤1.5。
In one embodiment, the combined focal length f of the second lens groupG2Combined focal length f with third lens groupG3Satisfies the following conditions: -2.5<fG3/fG2<-0.5。
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic view showing a structure of a zoom lens group at 3 times zoom according to embodiment 1 of the present application;
fig. 2 is a schematic structural view showing a zoom lens group at 4 times zoom according to embodiment 1 of the present application;
fig. 3 is a schematic structural view showing a zoom lens group at 5 times zoom according to embodiment 1 of the present application;
fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group at 3 times zooming of embodiment 1;
fig. 5A to 5D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group under 4-times zooming of embodiment 1;
fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group at 5 times zooming of embodiment 1;
fig. 7 is a schematic structural view showing a zoom lens group at 3 times zoom according to embodiment 2 of the present application;
fig. 8 is a schematic structural view showing a zoom lens group at 4 times zoom according to embodiment 2 of the present application;
fig. 9 is a schematic view showing the structure of a zoom lens group at 5 times zoom according to embodiment 2 of the present application;
fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group under 3-times zooming of embodiment 2;
fig. 11A to 11D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group under 4-times zooming of embodiment 2;
fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group under 5-times zooming of embodiment 2;
fig. 13 is a schematic view showing the structure of a zoom lens group at 3 × zoom according to embodiment 3 of the present application;
fig. 14 is a schematic structural view showing a zoom lens group at 4 times zoom according to embodiment 3 of the present application;
fig. 15 is a schematic structural view showing a zoom lens group at 5 times zoom according to embodiment 3 of the present application;
fig. 16A to 16D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group at 3 times zoom of embodiment 3;
fig. 17A to 17D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group under 4-times zooming in embodiment 3;
fig. 18A to 18D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group at 5 times zoom of embodiment 3;
fig. 19 is a schematic view showing the structure of a zoom lens group at 3 × zoom according to embodiment 4 of the present application;
fig. 20 is a schematic structural view showing a zoom lens group at 4 times zoom according to embodiment 4 of the present application;
fig. 21 is a schematic structural view showing a zoom lens group at 5 times zoom according to embodiment 4 of the present application;
fig. 22A to 22D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group under 3-times zooming of embodiment 4;
fig. 23A to 23D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group under 4-times zooming of embodiment 4;
fig. 24A to 24D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group under 5-times zooming of embodiment 4;
fig. 25 is a schematic view showing the structure of a zoom lens group at 3 × zoom according to embodiment 5 of the present application;
fig. 26 is a schematic view showing the structure of a zoom lens group at 4 × zoom according to embodiment 5 of the present application;
fig. 27 is a schematic view showing the structure of a zoom lens group at 5 times zoom according to embodiment 5 of the present application;
fig. 28A to 28D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group under 3-times zooming of embodiment 5;
fig. 29A to 29D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group under 4-times zooming in embodiment 5;
fig. 30A to 30D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the zoom lens group at 5 times zoom of embodiment 5;
fig. 31 is a schematic structural view showing a zoom lens group having an object distance of infinity at 3 times zoom according to embodiment 6 of the present application;
FIG. 32 is a schematic view showing the structure of a zoom lens group having an object distance of 1000mm at 3 times zoom according to embodiment 6 of the present application;
fig. 33 is a schematic structural view showing a zoom lens group having an object distance of infinity at 4 times zoom according to embodiment 6 of the present application;
FIG. 34 is a schematic view showing the structure of a zoom lens group having an object distance of 1000mm at 4 times zoom according to embodiment 6 of the present application;
fig. 35 is a schematic structural view showing a zoom lens group having an object distance of infinity at 5 times zoom according to embodiment 6 of the present application;
FIG. 36 is a schematic view showing the structure of a zoom lens group having an object distance of 1000mm at 5 times zoom according to embodiment 6 of the present application;
fig. 37A to 37D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of a zoom lens group of embodiment 6 having an object distance of infinity at 3 times zoom;
fig. 38A to 38D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of a zoom lens group of embodiment 6 having an object distance of 1000mm at 3 times zoom;
fig. 39A to 39D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of a zoom lens group of embodiment 6 having an object distance of infinity at 4 times zoom;
fig. 40A to 40D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of a zoom lens group of embodiment 6 having an object distance of 1000mm under 4-times zooming;
fig. 41A to 41D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of a zoom lens group of example 6 having an object distance of infinity at 5 times zoom;
fig. 42A to 42D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of a zoom lens group of embodiment 6 having an object distance of 1000mm at 5 times zoom.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The features, principles, and other aspects of the present application are described in detail below.
A zoom lens group according to an exemplary embodiment of the present application may include four lens groups, respectively, a first lens group, a second lens group, a third lens group, and a fourth lens group, wherein the first lens group may also be referred to as a front fixed group, the second lens group may also be referred to as a variable power group, the third lens group may also be referred to as a compensation group, and the fourth lens group may also be referred to as a rear fixed group.
A zoom lens group according to an exemplary embodiment of the present application may include eight lenses having optical powers, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, respectively. The eight lenses are arranged in order from the object side to the image side along the optical axis. Any adjacent two lenses of the first lens to the eighth lens may have a spacing distance therebetween.
Exemplarily, the first lens group includes a first lens. The second lens group includes a second lens, a stop, a third lens, a fourth lens, and a fifth lens. The third lens group includes a sixth lens and a seventh lens. The fourth lens group includes an eighth lens.
In an exemplary embodiment, the first lens may have a concave image-side surface with optical power; the second lens has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, and the object side surface of the third lens is a convex surface; the fourth lens has negative focal power, and the object side surface of the fourth lens is a concave surface; the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has positive focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; the seventh lens has negative focal power, the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a concave surface; the eighth lens has focal power, and the object-side surface of the eighth lens is a concave surface and the image-side surface of the eighth lens is a convex surface.
The zooming lens group can realize the continuous zooming function by reasonably distributing the focal power, the surface type and the interval of the first lens group, the second lens group, the third lens group and the fourth lens group, wherein the interval is variable; the first lens group can reduce aberration of the zoom lens group; the second lens group can change the focal length of the zoom lens group, and the diaphragm moves along with the second lens group, so that the zoom lens group in different focal length states has diaphragms with different sizes; the third lens group can compensate the movement of the imaging surface and keep the stability of the imaging surface; the position of the fourth lens group is kept unchanged in the zooming process, and the image quality is ensured by compensating the position of an imaging surface under different object distances, so that the focusing function is realized.
In an exemplary embodiment, a zoom lens group according to the present application may satisfy: 4.5<TTL/EPDW<7.0, where TTL is the on-axis distance from the object-side surface of the first lens element to the image plane, EPDWThe diameter of the entrance pupil at different zoom factors. For example, in the present application, the different zoom factors generally refer to all achievable zoom factor states, or each state is included. By restricting the ratio of the total length of the system and the diameter of the entrance pupil, the volume of the zoom lens group can be prevented from being too large, and the size of the zoom lens group can be reduced.
In an exemplary embodiment, a zoom lens group according to the present application may satisfy: 2.5<fW/T78W<52.0, wherein fWFor the total effective focal length of the zoom lens group at different zoom magnifications, T78WThe air space of the seventh lens and the eighth lens on the optical axis under different zoom factors. Illustratively, in fw/T78w, fw and T78w take on the same state. In an exemplary embodiment, when each of the following conditional expressions contains two or more variables, the conditional expressions are used to limit the values of the variables at the same zoom magnification. By restricting the ratio of the total effective focal length of the zoom lens group under different zoom multiples to the air space between the seventh lens and the eighth lens on the optical axis under different zoom multiples, the stroke of the fourth lens group G4 can be reasonably controlled, the realization of the zoom process is facilitated, and the difficulty of zooming in the structure is reducedAnd (4) degree.
In an exemplary embodiment, a zoom lens group according to the present application may satisfy: 2.5<fW/EPDW<4.5 wherein fWFor the total effective focal length, EPD, of the zoom lens group at different zoom factorsWThe diameter of the entrance pupil at different zoom factors. The zoom lens group has the characteristics of different sizes of light rings, and the ratio of the total effective focal length to the entrance pupil diameter under different zoom multiples is restricted, so that the luminous flux of the system can be increased, the imaging effect under a dark environment is enhanced, and meanwhile, the aberration of a marginal field of view can be reduced.
In an exemplary embodiment, a zoom lens group according to the present application may satisfy: 2.0< R2/R3<6.5, where R2 is the radius of curvature of the image-side surface of the first lens and R3 is the radius of curvature of the object-side surface of the second lens. By controlling the curvature radius of the image side surface of the first lens and the curvature radius of the object side surface of the second lens, the zoom lens group has strong capability of balancing astigmatism, and the deflection angle of a principal ray is reasonably controlled.
In an exemplary embodiment, a zoom lens group according to the present application may satisfy: 1.0< R4/R5<2.0, wherein R4 is the radius of curvature of the image-side surface of the second lens, and R5 is the radius of curvature R5 of the object-side surface of the third lens. By controlling the curvature radius of the image side surface of the second lens and the curvature radius of the object side surface of the third lens, the light angle of the marginal field of view can be in a reasonable range, and the sensitivity of the system can be effectively reduced.
In an exemplary embodiment, a zoom lens group according to the present application may satisfy: -3.5< R11/(R7+ R9+ R10) <3.0, wherein,
r7 is a radius of curvature of an object-side surface of the fourth lens, R9 is a radius of curvature of an object-side surface of the fifth lens, R10 is a radius of curvature of an image-side surface of the fifth lens, and R11 is a radius of curvature of an object-side surface of the sixth lens. By restricting the curvature radius of the object side surface of the fourth lens, the curvature radius of the object side surface of the fifth lens, the curvature radius of the image side surface of the fifth lens and the curvature radius of the object side surface of the sixth lens, the refraction angle of the light beam in the second lens group can be effectively controlled, so that the second lens group can effectively reduce the sensitivity of the system while changing the magnification of the lens.
In an exemplary embodiment, a zoom lens group according to the present application may satisfy: 1.0< R13/R12<2.0, wherein,
r12 is a radius of curvature of the image-side surface of the sixth lens element, and R13 is a radius of curvature of the object-side surface of the seventh lens element. By restricting the curvature radius of the image side surface of the sixth lens element and the curvature radius of the object side surface of the seventh lens element, the refraction angle of the light beam in the third lens element can be effectively controlled, so that the third lens element compensates the movement of the imaging surface, and the zoom lens assembly has good imaging quality.
In an exemplary embodiment, a zoom lens group according to the present application may satisfy: 15 degree<|FOVW|<35 deg., where | FOVWAnd | is the maximum field angle of the zoom lens group at different zoom multiples. The field angle range of the zoom lens group is reasonably controlled, so that the zoom lens group has better aberration balancing capability, the deflection angle of the main light ray can be reasonably controlled, and the matching degree with a chip is improved.
In an exemplary embodiment, a zoom lens group according to the present application may satisfy: 1.0< | R15+ R16|/R14<7.5, wherein R14 is a radius of curvature of an image-side surface of the seventh lens, R15 is a radius of curvature of an object-side surface of the eighth lens, and R16 is a radius of curvature of an image-side surface of the eighth lens. By restricting the curvature radius of the image side surface of the seventh lens and the curvature radius of the eighth lens, the refraction angle of the system light beam on the eighth lens can be effectively controlled, so that the lens achieves good zooming and focusing characteristics.
In an exemplary embodiment, a zoom lens group according to the present application may satisfy: 1.0< f3/f2<2.0, wherein f2 is the effective focal length of the second lens and f3 is the effective focal length of the third lens. The effective focal lengths of the second lens and the third lens are reasonably distributed, so that the zoom lens group can keep good imaging quality in the process of focal length change while aberration is corrected.
In an exemplary embodiment, a zoom lens group according to the present application may satisfy: 2.0< f6/f5<3.0, wherein f5 is the effective focal length of the fifth lens and f6 is the effective focal length of the sixth lens. The effective focal lengths of the fifth lens and the sixth lens are reasonably distributed, so that the light converging capability can be improved, and the aberration of the marginal field of view can be reduced.
In an exemplary embodiment, a zoom lens group according to the present application may satisfy: t12 not less than 1.0W/T56W<3.5, wherein, T12WFor air separation of the first and second lenses on the optical axis at different zoom powers, T56WThe air space of the fifth lens and the sixth lens on the optical axis under different zoom factors. By restricting the ratio of the air interval of the first lens and the second lens on the optical axis to the air interval of the fifth lens and the sixth lens on the optical axis under different zooming multiples, the stroke difference of the second lens group and the third lens group can be reasonably controlled, and the realization of the zooming process is facilitated.
In an exemplary embodiment, a zoom lens group according to the present application may satisfy: 0.5<|S3X-5XLess than or equal to 1.5, wherein S3X-5XIn order to adjust the focusing stroke of the first lens group and the fourth lens group from infinity to one meter at different zoom speeds, the fourth lens group can move relative to the first lens group along the optical axis direction in the present embodiment. By restricting the focusing stroke range of the fourth lens group, the image quality is ensured by compensating the position of the conjugate image plane under different object distances, so that the zoom lens group can smoothly focus under different object distances.
In an exemplary embodiment, a zoom lens group according to the present application may satisfy: -2.5<fG3/fG2<-0.5, wherein fG2Is the combined focal length f of the second lens groupG3Is the combined focal length of the third lens group. The ratio of the combined focal length of the second lens group to the combined focal length of the third lens group is restrained, so that the characteristic of continuous change of the focal length is favorably realized, meanwhile, the position of an imaging surface is kept unchanged, the aberration of the lens is effectively reduced, and the lens keeps good imaging quality in the zooming process.
In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the eighth lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens is an aspherical mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens has an object-side surface and an image-side surface which are aspheric mirror surfaces.
However, it will be understood by those skilled in the art that the number of lenses constituting the zoom lens group can be varied to achieve the various results and advantages described in the present specification without departing from the technical solutions claimed in the present application. For example, although eight lenses are exemplified in the embodiment, the zoom lens group is not limited to include eight lenses. The zoom lens group may further include other numbers of lenses, if necessary.
Specific examples of a zoom lens group applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
A zoom lens group at 3 × zoom, 4 × zoom and 5 × zoom according to embodiment 1 of the present application is described below with reference to fig. 1 to 6D, respectively. Fig. 1 shows a schematic structural view of a zoom lens group at 3 × zoom according to embodiment 1 of the present application, fig. 2 shows a schematic structural view of a zoom lens group at 4 × zoom according to embodiment 1 of the present application, and fig. 3 shows a schematic structural view of a zoom lens group at 5 × zoom according to embodiment 1 of the present application.
As shown in fig. 1-3, the zoom lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S19.
The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has positive power, and has a concave object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has positive power, and has a concave object-side surface S15 and a convex image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 1 shows a basic parameter table of the zoom lens group of embodiment 1, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm).
Flour mark Surface type Radius of curvature Thickness/distance Refractive index/Abbe number Coefficient of cone
OBJ Spherical surface All-round All-round
S1 Aspherical surface -66.8309 1.5620 1.55/56.0 58.4533
S2 Aspherical surface 15.8173 T12 -29.9594
S3 Aspherical surface 6.4378 2.3371 1.55/56.0 0.1230
S4 Aspherical surface 18.9371 0.8149 -9.8594
STO Spherical surface All-round 0.1000
S5 Aspherical surface 15.4671 0.8889 1.64/23.5 -45.0958
S6 Aspherical surface -85.1306 3.0766 92.6945
S7 Aspherical surface -5.7505 1.5343 1.68/19.2 -1.3816
S8 Aspherical surface 42.6334 0.1601 99.0000
S9 Aspherical surface 6.5589 3.1560 1.55/56.0 -0.1651
S10 Aspherical surface -8.1561 T56 0.3260
S11 Aspherical surface -15.1159 3.1666 1.68/19.2 11.3748
S12 Aspherical surface -7.4421 0.6948 0.6333
S13 Aspherical surface -8.7921 0.7540 1.55/56.0 2.1295
S14 Aspherical surface 9.4611 T78 -20.8939
S15 Aspherical surface -10.7008 0.4460 1.64/23.5 -22.8982
S16 Aspherical surface -10.1121 1.8354 -2.2658
S17 Spherical surface All-round 0.2100 1.52/64.2
S18 Spherical surface All-round 0.9546
S19 Spherical surface All-round
TABLE 1
In the present example, the total length TTL of the zoom lens group (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19 of the zoom lens group) is 30.49mm, and ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S19 of the zoom lens group, is 4.00 mm. The total effective focal length f of the zoom lens group under 3 times of zoomingWIs 13.87mm, and the maximum field angle FOV of the zoom lens groupWIs 32.2 deg., and the aperture value FnowIs 3.02; total effective focal length f of the zoom lens group under 4 times of zoomingW18.47mm, the maximum field angle FOV of the zoom lens groupWIs 24.2 deg., and aperture value FnoWIs 3.70; total effective focal length f of zoom lens group under 5 times of zoomingW22.50mm, the maximum field angle FOV of the zoom lens groupWIs 19.9 deg., and the aperture value FnoWIs 4.18.
Table 2 shows a parameter table for different zoom factors of embodiment 1, wherein fW、T12W、T56WAnd T78WAll units of (A) are millimeters (mm), FOVWIs given in degrees (°).
Figure DEST_PATH_GDA0002699268820000101
TABLE 2
In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the eighth lens E8 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:
Figure DEST_PATH_GDA0002699268820000111
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface.
Table 3 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S16 used in example 14、A6、A8、 A10、A12、A14、A16、A18、A20、A22、A24、A26、A28And A30。
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 -3.3606E-01 7.3792E-02 -6.6610E-03 1.3472E-03 -1.1746E-03 -3.2191E-04 2.1948E-03
S2 3.6120E-02 1.1077E-02 4.1986E-03 9.9611E-04 1.1679E-03 -5.9370E-04 -1.0804E-03
S3 2.8296E-02 -4.3257E-03 -1.3257E-03 1.3401E-04 3.2555E-05 6.6991E-05 6.0635E-05
S4 5.2722E-02 -1.0547E-02 -3.0346E-03 1.7346E-03 -6.6661E-05 1.9014E-04 1.2933E-04
S5 1.7762E-02 -1.1354E-02 3.6443E-03 4.4986E-03 -2.5236E-03 -5.8036E-04 -1.3963E-04
S6 -2.5854E-02 7.1059E-03 5.3393E-03 3.7082E-03 -2.3168E-03 -6.1729E-04 -5.5805E-04
S7 8.9883E-02 -3.7090E-02 1.0168E-03 -1.3683E-04 -2.4591E-04 1.0211E-04 8.3447E-05
S8 1.5439E-01 -2.8661E-02 2.4399E-03 2.7997E-04 -4.4185E-04 8.0520E-05 -1.4406E-05
S9 7.3808E-03 2.4732E-02 3.7595E-03 -1.3288E-03 -4.4628E-04 2.8156E-04 -6.7043E-05
S10 7.8943E-02 4.0887E-02 8.4957E-03 1.4132E-03 1.0501E-04 -1.0400E-04 -4.0779E-05
S11 2.7471E-01 2.3271E-02 -1.9675E-04 -1.4618E-03 -1.8653E-03 -3.8759E-04 -6.8826E-05
S12 2.6740E-01 1.0058E-01 -2.9955E-02 1.4993E-02 -1.5907E-03 2.5098E-03 -3.0812E-03
S13 -6.5582E-01 2.4155E-01 -5.5513E-02 3.0405E-02 -6.1136E-03 9.0034E-03 1.0472E-04
S14 -4.3511E-01 1.5749E-01 -8.5551E-02 3.7741E-02 -9.8492E-03 3.3330E-03 -8.6492E-03
S15 5.9330E-01 -4.2483E-01 2.2172E-01 5.6732E-02 7.0373E-04 -4.3729E-02 1.4695E-02
S16 1.4816E+00 -1.6354E-01 1.5628E-01 8.1672E-03 9.4831E-03 -1.6641E-02 -1.3393E-02
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 2.1212E-03 4.0318E-04 -1.5217E-04 3.4586E-04 4.3402E-04 1.5326E-04 0.0000E+00
S2 -5.4726E-04 -9.3744E-05 -1.5624E-04 -2.3647E-04 -1.4415E-04 -3.0530E-05 0.0000E+00
S3 3.7088E-05 2.5327E-05 1.3009E-05 6.3757E-06 1.9972E-06 8.7821E-07 0.0000E+00
S4 4.1018E-05 9.6358E-06 -7.2629E-06 -6.6729E-06 -3.0214E-06 -3.0548E-08 0.0000E+00
S5 8.0576E-05 2.8117E-04 2.8733E-04 1.8311E-04 7.0675E-05 1.3357E-05 0.0000E+00
S6 -4.6453E-04 -2.5095E-04 -1.2416E-04 -6.7856E-05 -3.3804E-05 -1.0998E-05 0.0000E+00
S7 6.9729E-05 4.3604E-05 2.1396E-05 8.2513E-06 2.0039E-06 3.5748E-07 0.0000E+00
S8 -7.2231E-08 -6.2078E-07 1.6459E-06 5.3227E-07 -5.0798E-07 4.9740E-08 0.0000E+00
S9 2.6002E-05 -4.2333E-06 2.6500E-06 -6.2397E-07 3.6472E-06 2.2188E-06 0.0000E+00
S10 -1.7261E-05 -4.1076E-07 2.5539E-06 2.5843E-06 -1.2218E-07 6.8962E-07 0.0000E+00
S11 7.1728E-05 1.5774E-04 1.4072E-04 7.1831E-05 2.9711E-05 7.7835E-06 0.0000E+00
S12 2.6992E-03 1.7825E-03 -5.2687E-04 -8.7859E-04 -2.0356E-04 -4.5304E-05 0.0000E+00
S13 -1.2644E-04 -2.4659E-04 1.8482E-04 5.9603E-05 4.6186E-05 1.1243E-05 -2.9786E-06
S14 7.8325E-04 8.7671E-05 1.7228E-04 -4.2979E-04 -5.4601E-05 -7.0034E-06 5.5522E-05
S15 2.1875E-02 1.4846E-03 -7.6127E-03 -8.2440E-04 2.6758E-03 9.0507E-04 -2.5098E-04
S16 -5.0605E-03 2.4902E-03 3.8149E-03 1.9172E-03 9.4672E-06 -3.0241E-04 -1.5577E-04
TABLE 3
Fig. 4A shows an on-axis chromatic aberration curve of the zoom lens group at 3 times zoom of embodiment 1, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve of the zoom lens group at 3 × zooming of embodiment 1, which represents meridional field curvature and sagittal field curvature. Fig. 4C shows a distortion curve of the zoom lens group at 3 times zoom of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows a chromatic aberration of magnification curve of the zoom lens group at 3 times zoom of embodiment 1, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 4A to 4D, the zoom lens group with 3 times zoom in embodiment 1 can achieve good imaging quality.
Fig. 5A shows an on-axis chromatic aberration curve of the zoom lens group at 4 times zoom of embodiment 1, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 5B shows an astigmatism curve of the zoom lens group at 4 times zoom of embodiment 1, which represents meridional field curvature and sagittal field curvature. Fig. 5C shows a distortion curve of the zoom lens group at 4 times zoom of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 5D shows a chromatic aberration of magnification curve of the zoom lens group at 4 times zoom of embodiment 1, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 5A to 5D, the zoom lens group with a zoom of 4 times in embodiment 1 can achieve good imaging quality.
Fig. 6A shows an on-axis chromatic aberration curve of the zoom lens group at 5 times zoom of embodiment 1, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve of the zoom lens group at 5 times zoom of embodiment 1, which represents meridional field curvature and sagittal field curvature. Fig. 6C shows a distortion curve of the zoom lens group at 5 times zoom of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a chromatic aberration of magnification curve of the zoom lens group at 5 times zoom of embodiment 1, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 6A to 6D, the zoom lens group at 5 × zoom in embodiment 1 can achieve good imaging quality.
Example 2
A zoom lens group at 3 × zoom, 4 × zoom and 5 × zoom according to embodiment 2 of the present application is described below with reference to fig. 7 to 12D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 7 shows a schematic structural view of a zoom lens group at 3 × zoom according to embodiment 2 of the present application, fig. 8 shows a schematic structural view of a zoom lens group at 4 × zoom according to embodiment 2 of the present application, and fig. 9 shows a schematic structural view of a zoom lens group at 5 × zoom according to embodiment 2 of the present application.
As shown in fig. 7-9, the zoom lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S19.
The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a concave object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has positive power, and has a concave object-side surface S15 and a convex image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total length TTL of the zoom lens group is 30.45mm, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 of the zoom lens group is 4.00 mm. The total effective focal length f of the zoom lens group under 3 times of zoomingWIs 13.87mm, and the maximum field angle FOV of the zoom lens groupWIs 32.2 deg., and the aperture value FnowIs 3.02; total effective focal length f of the zoom lens group under 4 times of zoomingW18.47mm, the maximum field angle FOV of the zoom lens groupWIs 24.3 deg., and the aperture value FnoWIs 3.70; total effective focal length f of zoom lens group under 5 times of zoomingW22.50mm, the maximum field angle FOV of the zoom lens groupWIs 20.0 deg., and the aperture value FnoWIs 4.18.
Table 4 shows a parameter table for different zoom factors of embodiment 2, wherein fW、T12W、T56WAnd T78WAll units of (A) are millimeters (mm), FOVWIs given in degrees (°).
Figure DEST_PATH_GDA0002699268820000131
TABLE 4
Table 5 shows a basic parameter table of the zoom lens group of embodiment 2, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Table 6 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Figure DEST_PATH_GDA0002699268820000132
Figure DEST_PATH_GDA0002699268820000141
TABLE 5
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 -3.8127E-01 8.2454E-02 -7.6544E-03 1.9038E-05 -8.6484E-04 1.8268E-04 1.9049E-03
S2 5.3635E-03 1.9046E-02 1.8777E-03 2.5493E-04 1.8043E-03 -7.4022E-04 -1.1576E-03
S3 2.8865E-02 -3.6658E-03 -1.5405E-03 5.7102E-05 5.6233E-08 2.5901E-05 3.1459E-05
S4 5.1653E-02 -9.2318E-03 -3.9157E-03 1.7186E-03 1.0835E-04 2.1665E-04 1.7393E-04
S5 3.3985E-02 -1.6645E-02 2.2402E-03 4.3725E-03 -2.2349E-03 -3.5968E-04 1.1311E-04
S6 -4.2676E-02 1.2142E-02 6.1043E-03 4.5696E-03 -2.3364E-03 -1.3601E-03 -7.8207E-04
S7 9.0096E-02 -3.7573E-02 1.6552E-03 -1.1987E-04 -1.7166E-04 1.1340E-04 1.0385E-04
S8 1.5987E-01 -2.7930E-02 1.8152E-03 2.1536E-04 -4.2563E-04 8.2814E-05 -1.0974E-05
S9 1.1060E-02 2.6271E-02 4.9421E-04 -9.9614E-04 -3.6405E-04 3.1487E-04 -9.6078E-05
S10 6.8952E-02 4.5033E-02 8.0660E-03 1.1859E-03 -1.9893E-05 -1.3337E-04 -5.4071E-05
S11 2.4810E-01 2.3641E-02 2.1066E-03 -1.4555E-03 -1.9980E-03 -5.3960E-04 -8.5743E-05
S12 2.8423E-01 9.5281E-02 -2.0597E-02 7.1378E-03 2.1905E-03 2.4860E-03 -3.7108E-03
S13 -6.4045E-01 2.2860E-01 -4.1611E-02 2.1836E-02 -4.6907E-03 9.3005E-03 5.4671E-04
S14 -3.8737E-01 1.5394E-01 -8.3941E-02 3.2278E-02 -5.4667E-03 2.4860E-03 -9.1874E-03
S15 3.6322E+00 -8.0006E-01 6.5840E-02 1.5772E-01 -4.2244E-04 -5.7618E-02 4.3112E-03
S16 2.8533E+00 -1.4775E-01 4.7485E-02 2.4336E-03 2.1089E-02 -6.1443E-03 -1.8438E-02
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 1.8650E-03 6.8692E-04 2.4431E-05 7.6345E-05 1.2996E-04 5.3557E-05 0.0000E+00
S2 -4.7597E-04 -9.0957E-05 -2.0817E-04 -2.3345E-04 -1.1410E-04 -1.9357E-05 0.0000E+00
S3 2.3583E-05 1.7386E-05 9.5625E-06 4.9822E-06 7.0566E-07 3.5963E-07 0.0000E+00
S4 8.5683E-05 4.1240E-05 1.3403E-05 5.7201E-06 -4.9906E-07 6.5543E-08 0.0000E+00
S5 4.4349E-05 6.2616E-05 8.4599E-05 6.2574E-05 2.6438E-05 3.3774E-06 0.0000E+00
S6 -3.6220E-04 -2.4285E-05 9.7103E-05 7.8438E-05 2.8192E-05 3.8435E-06 0.0000E+00
S7 7.8896E-05 4.9065E-05 2.4161E-05 1.0176E-05 2.4076E-06 5.0494E-07 0.0000E+00
S8 1.6231E-06 -1.3951E-06 6.5348E-07 7.0471E-07 -2.5135E-07 -2.9927E-08 0.0000E+00
S9 2.6277E-05 -3.4451E-06 5.6717E-06 -7.1903E-08 3.2722E-06 2.3251E-06 0.0000E+00
S10 -1.5209E-05 -1.0097E-06 2.3028E-06 1.8974E-06 -1.6990E-07 2.2736E-07 0.0000E+00
S11 1.0314E-04 1.8617E-04 1.7874E-04 9.1860E-05 3.4741E-05 6.4463E-06 0.0000E+00
S12 2.2984E-03 2.2540E-03 -1.9166E-04 -1.2957E-03 -6.6371E-04 -1.9426E-04 0.0000E+00
S13 7.5663E-05 -6.2703E-04 -1.8606E-04 -2.3776E-04 -9.9286E-05 -5.3720E-05 -1.6975E-05
S14 6.9324E-04 6.1437E-04 5.1096E-04 -6.9605E-04 -3.2784E-04 -1.1045E-04 6.6504E-05
S15 3.3406E-02 5.0374E-04 -1.0728E-02 -1.8847E-03 5.3466E-03 3.0769E-03 7.0134E-04
S16 -9.9022E-03 2.6651E-03 6.7814E-03 4.2883E-03 9.4743E-04 -1.8970E-04 -1.9256E-04
TABLE 6
Fig. 10A shows an on-axis chromatic aberration curve of the zoom lens group at 3 times zoom of embodiment 2, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve of the zoom lens group at 3 × zooming of embodiment 2, which represents meridional field curvature and sagittal field curvature. Fig. 10C shows a distortion curve of the zoom lens group at 3 times zoom of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a chromatic aberration of magnification curve of the zoom lens group at 3 times zoom of embodiment 2, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 10A to 10D, the zoom lens group at 3 × zoom in embodiment 2 can achieve good imaging quality.
Fig. 11A shows an on-axis chromatic aberration curve of the zoom lens group at 4 times zoom of embodiment 2, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 11B shows an astigmatism curve of the zoom lens group at 4 times zoom of embodiment 2, which represents meridional field curvature and sagittal field curvature. Fig. 11C shows a distortion curve of the zoom lens group at 4 times zoom of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 11D shows a chromatic aberration of magnification curve of the zoom lens group at 4 times zoom of embodiment 2, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 11A to 11D, the zoom lens group at 4 × zoom in embodiment 2 can achieve good imaging quality.
Fig. 12A shows an on-axis chromatic aberration curve of the zoom lens group at 5 times zoom of embodiment 2, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve of the zoom lens group at 5 times zoom of embodiment 2, which represents meridional field curvature and sagittal field curvature. Fig. 12C shows a distortion curve of the zoom lens group at 5 times zoom of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 12D shows a chromatic aberration of magnification curve of the zoom lens group at 5 times zoom of embodiment 2, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 12A to 12D, the zoom lens group at 5 × zoom in embodiment 2 can achieve good imaging quality.
Example 3
A zoom lens group at 3 × zoom, 4 × zoom and 5 × zoom according to embodiment 3 of the present application is described below with reference to fig. 13 to 18D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 13 is a schematic view showing a structure of a zoom lens group at 3 times zoom according to embodiment 3 of the present application, fig. 14 is a schematic view showing a structure of a zoom lens group at 4 times zoom according to embodiment 3 of the present application, and fig. 15 is a schematic view showing a structure of a zoom lens group at 5 times zoom according to embodiment 3 of the present application.
As shown in fig. 13-15, the zoom lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S19.
The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a concave object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a convex image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total length TTL of the zoom lens group is 30.36mm, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 of the zoom lens group is 4.00 mm. The total effective focal length f of the zoom lens group under 3 times of zoomingWIs 14.00mm, and the maximum field angle FOV of the zoom lens groupWIs 31.9 deg., and aperture value FnowIs 2.89; total effective focal length f of the zoom lens group under 4 times of zoomingW18.30mm, the maximum field angle FOV of the zoom lens groupWIs 24.5 deg., and aperture value FnoWIs 3.53; total effective focal length f of zoom lens group under 5 times of zoomingW23.20 mm, the maximum field angle FOV of the zoom lens groupWIs 19.4 deg., and the aperture value FnoWWas 4.11.
Table 7 shows a parameter table for different zoom factors of embodiment 3, wherein fW、T12W、T56WAnd T78WAll units of (A) are millimeters (mm), FOVWIs given in degrees (°).
Figure DEST_PATH_GDA0002699268820000161
TABLE 7
Table 8 shows a basic parameter table of the zoom lens group of embodiment 3, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Table 9 shows high-order term coefficients that can be used for each aspherical mirror surface in embodiment 3, wherein each aspherical mirror surface type can be defined by the formula (1) given in embodiment 1 above.
Flour mark Surface type Radius of curvature Thickness/distance Refractive index/Abbe number Coefficient of cone
OBJ Spherical surface All-round All-round
S1 Aspherical surface -69.1706 1.5346 1.55/56.0 98.2171
S2 Aspherical surface 15.9258 T12 -33.2169
S3 Aspherical surface 6.4154 2.4518 1.55/56.0 0.0928
S4 Aspherical surface 19.3707 0.8944 -9.6673
STO Spherical surface All-round 0.1000
S5 Aspherical surface 15.7950 0.9146 1.64/23.5 -44.5473
S6 Aspherical surface -87.6438 3.1071 99.0000
S7 Aspherical surface -5.8264 1.3444 1.68/19.2 -1.5072
S8 Aspherical surface 36.3516 0.1000 98.9559
S9 Aspherical surface 6.4786 3.0958 1.55/56.0 -0.0743
S10 Aspherical surface -8.7224 T56 0.4275
S11 Aspherical surface -16.8649 3.6317 1.68/19.2 14.1415
S12 Aspherical surface -7.2142 0.6885 0.5890
S13 Aspherical surface -8.7096 0.7076 1.55/56.0 1.9395
S14 Aspherical surface 9.4622 T78 -19.5048
S15 Aspherical surface -7.0394 0.4063 1.64/23.5 -26.4412
S16 Aspherical surface -7.2751 1.5911 -11.4945
S17 Spherical surface All-round 0.2100 1.52/64.2
S18 Spherical surface All-round 0.7103
S19 Spherical surface All-round
TABLE 8
Figure DEST_PATH_GDA0002699268820000162
Figure DEST_PATH_GDA0002699268820000171
Figure DA00026439007131260
TABLE 9
Fig. 16A shows an on-axis chromatic aberration curve of the zoom lens group at 3 times zoom of embodiment 3, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 16B shows an astigmatism curve of the zoom lens group at 3 times zoom of embodiment 3, which represents meridional field curvature and sagittal field curvature. Fig. 16C shows a distortion curve of the zoom lens group at 3 times zoom of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 16D shows a chromatic aberration of magnification curve of the zoom lens group at 3 times zoom of embodiment 3, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 16A to 16D, the zoom lens group at 3 × zoom in embodiment 3 can achieve good imaging quality.
Fig. 17A shows on-axis aberration curves of the zoom lens group at 4 times zoom of embodiment 3, which represent the convergent focus deviations of light rays of different wavelengths after passing through the lens. Fig. 17B shows an astigmatism curve of the zoom lens group at 4 times zoom of embodiment 3, which represents meridional field curvature and sagittal field curvature. Fig. 17C shows a distortion curve of the zoom lens group at 4 times zoom of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 17D shows a chromatic aberration of magnification curve of the zoom lens group at 4 times zoom of embodiment 3, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 17A to 17D, the zoom lens group at 4 × zoom in embodiment 3 can achieve good imaging quality.
Fig. 18A shows an on-axis chromatic aberration curve of the zoom lens group at 5 times zoom of embodiment 3, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 18B shows an astigmatism curve of the zoom lens group at 5 times zoom of embodiment 3, which represents meridional field curvature and sagittal field curvature. Fig. 18C shows a distortion curve of the zoom lens group at 5 times zoom of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 18D shows a chromatic aberration of magnification curve of the zoom lens group at 5 times zoom of embodiment 3, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 18A to 18D, the zoom lens group at 5 × zoom in embodiment 3 can achieve good imaging quality.
Example 4
A zoom lens group at 3 × zoom, 4 × zoom and 5 × zoom according to embodiment 4 of the present application is described below with reference to fig. 19 to 24D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 19 shows a schematic structural view of a zoom lens group at 3 × zoom according to embodiment 4 of the present application, fig. 20 shows a schematic structural view of a zoom lens group at 4 × zoom according to embodiment 4 of the present application, and fig. 21 shows a schematic structural view of a zoom lens group at 5 × zoom according to embodiment 4 of the present application.
As shown in fig. 19-21, the zoom lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S19.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a concave object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has positive power, and has a concave object-side surface S15 and a convex image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total length TTL of the zoom lens group is 26.25mm, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 of the zoom lens group is 4.00 mm. The total effective focal length f of the zoom lens group under 3 times of zoomingW13.50mm, the maximum field angle FOV of the zoom lens groupWIs 32.4 deg., and the aperture value FnowIs 3.02; total effective focal length f of the zoom lens group under 4 times of zoomingW18.50mm, the maximum field angle FOV of the zoom lens groupW23.9 °, and aperture value FnoWIs 3.70; total effective focal length f of zoom lens group under 5 times of zoomingW23.50 mm, the maximum field angle FOV of the zoom lens groupWIs 19.2 deg., and the aperture value FnoWIs 4.18.
Table 10 shows a parameter table for different zoom factors of embodiment 4, wherein fW、T12W、T56WAnd T78WAll units of (A) are millimeters (mm), FOVWIs given in degrees (°).
Figure DEST_PATH_GDA0002699268820000191
Watch 10
Table 11 shows a basic parameter table of the zoom lens group of embodiment 4, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Table 12 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark Surface type Radius of curvature Thickness/distance Refractive index/Abbe number Coefficient of cone
OBJ Spherical surface All-round All-round
S1 Aspherical surface 27.8617 3.3734 1.55/56.0 -2.3860
S2 Aspherical surface 54.4720 T12 -38.6302
S3 Aspherical surface 8.4674 0.6354 1.55/56.0 -0.1371
S4 Aspherical surface 39.1050 0.4359 24.7467
STO Spherical surface All-round 0.1151
S5 Aspherical surface 25.7408 0.4866 1.64/23.5 -19.3400
S6 Aspherical surface -78.0736 1.8736 99.0000
S7 Aspherical surface -7.6814 0.9492 1.68/19.2 -1.1210
S8 Aspherical surface 29.5584 1.3225 98.7601
S9 Aspherical surface 14.8452 3.0142 1.55/56.0 -4.7394
S10 Aspherical surface -5.0692 T56 0.2892
S11 Aspherical surface -6.6185 1.7537 1.68/19.2 -2.0264
S12 Aspherical surface -5.0313 0.6176 -1.9567
S13 Aspherical surface -8.1047 0.9360 1.55/56.0 3.0645
S14 Aspherical surface 6.0881 T78 -16.5335
S15 Aspherical surface -25.5905 0.4605 1.64/23.5 -15.2429
S16 Aspherical surface -19.2737 0.7064 -36.7756
S17 Spherical surface All-round 0.2100 1.52/64.2
S18 Spherical surface All-round 0.1000
S19 Spherical surface All-round
TABLE 11
Figure DEST_PATH_GDA0002699268820000192
Figure DEST_PATH_GDA0002699268820000201
Figure DA00026439007131339
TABLE 12
Fig. 22A shows an on-axis chromatic aberration curve of the zoom lens group at 3 times zoom of embodiment 4, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 22B shows an astigmatism curve of the zoom lens group at 3 × zooming of embodiment 4, which represents meridional field curvature and sagittal field curvature. Fig. 22C shows a distortion curve of the zoom lens group at 3 times zoom of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 22D shows a chromatic aberration of magnification curve of the zoom lens group at 3 times zoom of embodiment 4, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 22A to 22D, the zoom lens group at 3 × zoom in embodiment 4 can achieve good imaging quality.
Fig. 23A shows an on-axis chromatic aberration curve of the zoom lens group at 4 × zoom of embodiment 4, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 23B shows an astigmatism curve of the zoom lens group at 4 times zoom of embodiment 4, which represents meridional field curvature and sagittal field curvature. Fig. 23C shows a distortion curve of the zoom lens group at 4 times zoom of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 23D shows a chromatic aberration of magnification curve of the zoom lens group at 4 times zoom of embodiment 4, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 23A to 23D, the zoom lens group at 4 × zoom in embodiment 4 can achieve good imaging quality.
Fig. 24A shows an on-axis chromatic aberration curve of the zoom lens group at 5 times zoom of embodiment 4, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 24B shows an astigmatism curve of the zoom lens group at 5 times zoom of embodiment 4, which represents meridional field curvature and sagittal field curvature. Fig. 24C shows a distortion curve of the zoom lens group at 5 times zoom of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 24D shows a chromatic aberration of magnification curve of the zoom lens group at 5 times zoom of embodiment 3, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 24A to 24D, the zoom lens group at 5 × zoom in embodiment 4 can achieve good imaging quality.
Example 5
A zoom lens group at 3 × zoom, 4 × zoom and 5 × zoom according to embodiment 5 of the present application is described below with reference to fig. 25 to 30D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 25 shows a schematic structural view of a zoom lens group at 3 × zoom according to embodiment 5 of the present application, fig. 26 shows a schematic structural view of a zoom lens group at 4 × zoom according to embodiment 5 of the present application, and fig. 27 shows a schematic structural view of a zoom lens group at 5 × zoom according to embodiment 5 of the present application.
As shown in fig. 25-27, the zoom lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S19.
The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a concave object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has positive power, and has a concave object-side surface S15 and a convex image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total length TTL of the zoom lens group is 28.66mm, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 of the zoom lens group is 4.00 mm. The total effective focal length f of the zoom lens group under 3 times of zoomingW13.00mm, the maximum field angle FOV of the zoom lens groupWIs 34.2 deg., and the aperture value FnowIs 3.02; total effective focal length f of the zoom lens group under 4 times of zoomingW18.60mm, the maximum field angle FOV of the zoom lens groupWIs 24.1 deg., and the aperture value FnoWIs 3.70; total effective focal length f of zoom lens group under 5 times of zoomingW23.00 mm, the maximum field angle FOV of the zoom lens groupWIs 19.5 deg., and the aperture value FnoWIs 4.18.
Table 13 shows a parameter table for different zoom magnifications of embodiment 5, wherein fW、T12W、T56WAnd T78WAll units of (A) are millimeters (mm), FOVWIs given in degrees (°).
Figure DEST_PATH_GDA0002699268820000211
Figure DEST_PATH_GDA0002699268820000221
Watch 13
Table 14 shows a basic parameter table of the zoom lens group of embodiment 5, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Table 15 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark Surface type Radius of curvature Thickness/distance Refractive index/Abbe number Coefficient of cone
OBJ Spherical surface All-round All-round
S1 Aspherical surface -132.0563 0.8030 1.55/56.0 95.2305
S2 Aspherical surface 15.0602 T12 -35.0666
S3 Aspherical surface 6.4319 2.5528 1.55/56.0 0.0233
S4 Aspherical surface 24.4766 1.3440 -10.1857
STO Spherical surface All-round 0.1000
S5 Aspherical surface 17.8424 0.8449 1.64/23.5 -46.9236
S6 Aspherical surface -123.6235 2.9861 66.3591
S7 Aspherical surface -5.1090 0.9507 1.68/19.2 -1.8067
S8 Aspherical surface -149.0000 0.1000 -99.0000
S9 Aspherical surface 7.3578 2.5787 1.55/56.0 0.0371
S10 Aspherical surface -7.9838 T56 0.1701
S11 Aspherical surface -16.3351 3.6000 1.68/19.2 12.7356
S12 Aspherical surface -7.0495 0.6840 0.2284
S13 Aspherical surface -8.4340 0.6013 1.55/56.0 2.6430
S14 Aspherical surface 8.9696 T78 -24.4162
S15 Aspherical surface -22.4244 0.3210 1.64/23.5 -20.4793
S16 Aspherical surface -21.2347 1.2337 -58.5843
S17 Spherical surface All-round 0.2100 1.52/64.2
S18 Spherical surface All-round 0.3412
S19 Spherical surface All-round
TABLE 14
Figure DA00026439007131450
Figure DEST_PATH_GDA0002699268820000222
Figure DEST_PATH_GDA0002699268820000231
Watch 15
Fig. 28A shows on-axis aberration curves of the zoom lens group at 3 times zoom of embodiment 5, which represent the convergent focus deviations of light rays of different wavelengths after passing through the lens. Fig. 28B shows an astigmatism curve of the zoom lens group at 3 × zoom of embodiment 5, which represents meridional field curvature and sagittal field curvature. Fig. 28C shows a distortion curve of the zoom lens group at 3 times zoom of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 28D shows a chromatic aberration of magnification curve of the zoom lens group at 3 times zoom of embodiment 5, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 28A to 28D, the zoom lens group at 3 × zoom in embodiment 5 can achieve good imaging quality.
Fig. 29A shows on-axis aberration curves of the zoom lens group at 4 × zoom of embodiment 5, which represent the convergent focus deviations of light rays of different wavelengths after passing through the lens. Fig. 29B shows an astigmatism curve of the zoom lens group at 4 × zoom of embodiment 5, which represents meridional field curvature and sagittal field curvature. Fig. 29C shows a distortion curve of the zoom lens group at 4 times zoom of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 29D shows a chromatic aberration of magnification curve of the zoom lens group at 4 × zoom of embodiment 5, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 29A to 29D, the zoom lens group at 4 × zoom in embodiment 5 can achieve good imaging quality.
Fig. 30A shows an on-axis chromatic aberration curve of the zoom lens group at 5 times zoom of embodiment 5, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 30B shows an astigmatism curve of the zoom lens group at 5 times zoom of embodiment 5, which represents meridional field curvature and sagittal field curvature. Fig. 30C shows a distortion curve of the zoom lens group at 5 times zoom of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 30D shows a chromatic aberration of magnification curve of the zoom lens group at 5 times zoom of embodiment 5, which represents a deviation of different image heights on the image plane after light passes through the lens. As can be seen from fig. 30A to 30D, the zoom lens group at 5 times zoom in embodiment 5 can achieve good imaging quality.
Example 6
A zoom lens group having an object distance of infinity and 1000mm in 3 × zoom, 4 × zoom and 5 × zoom according to embodiment 6 of the present application is described below with reference to fig. 31 to 42D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 31 is a schematic structural view showing a zoom lens group having an object distance of infinity at 3 times zoom according to embodiment 6 of the present application, and fig. 32 is a schematic structural view showing a zoom lens group having an object distance of 1000mm at 3 times zoom according to embodiment 6 of the present application; fig. 33 is a schematic structural view showing a zoom lens group having an object distance of infinity at 4 times zoom according to embodiment 6 of the present application; FIG. 34 is a schematic view showing the structure of a zoom lens group having an object distance of 1000mm at 4 times zoom according to embodiment 6 of the present application; fig. 35 is a schematic structural view showing a zoom lens group having an object distance of infinity at 5 times zoom according to embodiment 6 of the present application; fig. 36 is a schematic structural view showing a zoom lens group having an object distance of 1000mm at 5 times zoom according to embodiment 6 of the present application.
As shown in fig. 31-36, the zoom lens assembly, in order from an object side to an image side, comprises: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S19.
The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a concave object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a convex image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total length TTL of the zoom lens group is 30.60mm, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface S19 of the zoom lens group is 4.00 mm. Aperture value Fno under 3 times zoomwIs 3.01; aperture value Fno at 4 times zoomwIs 3.70; aperture value Fno at 5 times zoomwWas 4.23. The total effective focal length f of the zoom lens group when the object distance is infinity under 3 times of zoomingW13.87mm, the maximum field angle FOV of the variable focus lens packageW27.74 °; when the object distance is 1000mm far under 3 times of zooming, the total effective focal length f of the zoom lens groupW13.75mm, the maximum field angle FOV of the zoom lens groupW27.50 °; the total effective focal length f of the zoom lens group when the object distance is infinity under 4 times of zoomingW18.47mm, maximum field angle FOV of the variable focus lens packageW36.94 degrees; the total effective focal length f of the zoom lens group is 1000m far under 4 times of zoomingW18.18mm, maximum field angle FOV of the variable focus lens packageW36.36 °; the total effective focal length f of the zoom lens group when the object distance is infinity under 5 times of zoomingW22.50mm, the maximum field angle FOV of the variable focus lens packageWIs 45 degrees; when the object distance is 1000mm far under 5 times of zooming, the total of the zoom lens groupEffective focal length fWIs 21.96mm, and the maximum field angle FOV of the zoom lens groupWAnd was 43.91.
Table 16 shows a parameter table for different zoom magnifications of embodiment 6, wherein T12W、T56WAnd T78WThe units of (a) are millimeters (mm). Table 17 shows a table of parameters for different object distances at different zoom factors for example 6, where the FOV isWIs given in degrees (°). Table 18 shows the focusing data for different object distances at different zoom factors of example 6.
Figure DEST_PATH_GDA0002699268820000251
TABLE 16
Figure DEST_PATH_GDA0002699268820000252
TABLE 17
Figure DEST_PATH_GDA0002699268820000253
Watch 18
Table 19 shows a basic parameter table of the zoom lens group of embodiment 6, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Table 20 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Figure DEST_PATH_GDA0002699268820000254
Figure DEST_PATH_GDA0002699268820000261
Watch 19
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 -1.6890E-01 3.9883E-02 3.3544E-03 3.6385E-03 -4.0608E-03 -5.2412E-04 3.2011E-03
S2 6.1868E-02 2.1205E-03 4.9727E-03 3.9158E-03 2.8928E-04 -1.5334E-03 -9.4539E-04
S3 3.4192E-02 -3.3026E-03 -1.9527E-03 3.1772E-04 1.3189E-05 9.5737E-05 -1.0290E-04
S4 5.3139E-02 -6.4666E-03 -4.6358E-03 3.0404E-03 -7.5616E-04 3.6560E-04 -3.0759E-04
S5 2.9904E-02 -1.3449E-02 2.8892E-03 4.3840E-03 -3.0667E-03 -4.2287E-04 1.0417E-05
S6 -2.9277E-02 -9.6339E-04 8.8347E-03 4.2899E-03 -2.1314E-03 -1.8330E-03 -9.4389E-04
S7 6.6780E-02 -3.2106E-02 1.4468E-03 -1.8162E-05 3.0699E-04 -4.5515E-05 2.2252E-05
S8 1.4674E-01 -2.2291E-02 4.0281E-03 -8.7609E-04 7.3318E-04 -3.7135E-04 7.5047E-05
S9 -1.5727E-02 2.5728E-02 1.0639E-02 2.8519E-05 1.1795E-03 -5.5383E-04 4.3730E-04
S10 7.3030E-02 2.7011E-02 7.4081E-03 2.0036E-03 7.5076E-04 1.3845E-04 8.7925E-05
S11 2.8145E-01 9.3322E-03 1.5852E-03 -8.3230E-04 -9.9380E-04 -1.0474E-03 -4.0801E-04
S12 3.0904E-01 1.3969E-03 3.6223E-02 3.8708E-03 -2.2784E-03 -2.8078E-03 3.0867E-03
S13 -6.3943E-01 1.8175E-01 -1.8927E-02 1.5490E-02 6.7653E-03 1.4837E-03 2.7003E-03
S14 -8.3184E-01 2.6210E-01 -7.4923E-02 1.9779E-02 3.0760E-04 -4.7872E-04 -4.0853E-03
S15 2.3108E-01 2.8033E-01 7.9128E-02 -2.0509E-02 -4.2879E-02 -3.3961E-02 -2.1409E-02
S16 1.2674E+00 2.5555E-01 1.5030E-01 5.2421E-02 1.2881E-02 -1.6887E-02 -2.4554E-02
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 1.5177E-03 -2.1544E-04 3.4870E-04 8.5952E-04 4.1826E-04 -4.3822E-06 -5.0455E-05
S2 -1.0873E-04 -1.9028E-04 -5.0262E-04 -4.3057E-04 -1.4419E-04 1.1204E-05 2.0127E-05
S3 -9.9732E-05 -1.0716E-04 -8.7722E-05 -6.0580E-05 -3.5396E-05 -1.1796E-05 -3.5930E-06
S4 2.8693E-04 9.6607E-05 2.7886E-05 1.3636E-06 7.3069E-06 2.0252E-05 -2.4151E-06
S5 8.4942E-04 -1.0432E-04 -1.2494E-04 4.9980E-06 2.9486E-05 -2.3017E-05 -3.9656E-05
S6 -1.3165E-05 -9.5053E-05 7.7980E-05 1.2268E-04 5.8831E-05 -1.0299E-05 -1.7287E-05
S7 1.5361E-06 1.0383E-05 3.5064E-05 4.3674E-05 3.5444E-05 2.0065E-05 5.3310E-06
S8 1.6803E-05 1.1408E-05 3.3605E-06 -1.7494E-07 -6.4087E-06 3.5896E-07 8.2284E-07
S9 2.1030E-05 2.0511E-05 9.1064E-06 3.0628E-05 3.1071E-05 2.3985E-05 2.4077E-06
S10 5.0564E-05 3.3990E-05 8.1646E-06 2.8027E-06 -3.8670E-06 1.4234E-06 1.1113E-06
S11 2.6787E-05 3.0006E-04 2.9400E-04 2.0421E-04 9.4316E-05 3.2657E-05 3.0682E-06
S12 1.5702E-03 2.4117E-05 -8.3255E-04 4.3714E-05 4.4865E-04 3.4269E-04 6.2761E-05
S13 -6.7414E-04 9.5897E-04 8.1809E-05 6.0586E-04 3.4719E-04 3.2131E-04 5.3795E-05
S14 -2.9905E-03 1.2443E-03 1.3598E-04 -3.7662E-04 -1.3452E-03 -7.9906E-04 -3.8181E-04
S15 -2.0264E-02 -2.0401E-02 -1.7075E-02 -1.0294E-02 -4.3583E-03 -1.0939E-03 -1.1020E-04
S16 -2.5032E-02 -1.8876E-02 -1.2526E-02 -6.6946E-03 -3.0757E-03 -1.0275E-03 -2.8120E-04
Watch 20
Fig. 37A shows an on-axis chromatic aberration curve of the zoom lens group of embodiment 6 having an object distance of infinity at 3 times zoom, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 37B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the zoom lens group of example 6 having an object distance of infinity at 3 times zoom. Fig. 37C shows a distortion curve of the zoom lens group having an object distance of infinity at 3 times zoom of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 37D shows a chromatic aberration of magnification curve of the zoom lens group having an object distance of infinity at 3 times zoom of embodiment 6, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. As can be seen from fig. 37A to 37D, the zoom lens group of embodiment 6 having an object distance of infinity at 3 times zooming can achieve good imaging quality.
Fig. 38A shows an on-axis aberration curve of the zoom lens group of embodiment 6 having an object distance of 1000mm at 3 times zoom, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 38B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of a zoom lens group having an object distance of 1000mm at 3 × zoom of example 6. Fig. 38C shows a distortion curve of the zoom lens group of embodiment 6 having an object distance of 1000mm at 3 times zoom, which represents distortion magnitude values corresponding to different image heights. Fig. 38D shows a chromatic aberration of magnification curve of the zoom lens group of embodiment 6 having an object distance of 1000mm at 3 times zoom, which represents the deviation of different image heights of light rays on the image plane after passing through the lens. As can be seen from fig. 38A to 38D, the zoom lens group of embodiment 6 with an object distance of 1000mm under 3 times zooming can achieve good imaging quality.
Fig. 39A shows an on-axis chromatic aberration curve of the zoom lens group of embodiment 6, which shows the convergent focus deviations of light rays of different wavelengths after passing through the lens, at an object distance of infinity at 4 times zoom. Fig. 39B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of a zoom lens group having an object distance of infinity at 4 times zoom of embodiment 6. Fig. 39C shows a distortion curve of the zoom lens group having an object distance of infinity at 4 times zoom of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 39D shows a chromatic aberration of magnification curve of the zoom lens group having an object distance of infinity at 4 times zoom of embodiment 6, which represents the deviation of different image heights of light rays on the image plane after passing through the lens. As can be seen from fig. 39A to 39D, the zoom lens group of embodiment 6 having an object distance of infinity at 4 times zoom can achieve good imaging quality.
Fig. 40A shows an on-axis aberration curve of the zoom lens group of embodiment 6 having an object distance of 1000mm at 4 times zoom, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 40B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of a zoom lens group having an object distance of 1000mm at 4 times zoom of example 6. Fig. 40C shows a distortion curve of the zoom lens group of embodiment 6 having an object distance of 1000mm at 4 times zoom, which represents distortion magnitude values corresponding to different image heights. Fig. 40D shows a chromatic aberration of magnification curve of the zoom lens group of embodiment 6 having an object distance of 1000mm at 4 times zoom, which represents the deviation of different image heights of light rays on the image plane after passing through the lens. As can be seen from fig. 40A to 40D, the zoom lens group of embodiment 6 with an object distance of 1000mm under 4 times zooming can achieve good imaging quality.
Fig. 41A shows an on-axis aberration curve of the zoom lens group at an object distance of infinity at 5 times zoom of embodiment 6, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 41B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of a zoom lens group having an object distance of infinity at 5 times zoom of example 6. Fig. 41C shows a distortion curve of the zoom lens group having an object distance of infinity at 5 times zoom of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 41D shows a chromatic aberration of magnification curve of the zoom lens group having an object distance of infinity at 5 times zoom of embodiment 6, which represents the deviation of different image heights of light rays on the image plane after passing through the lens. As can be seen from fig. 41A to 41D, the zoom lens group of embodiment 6 with an object distance of infinity at 5 times zooming can achieve good imaging quality.
Fig. 42A shows an on-axis aberration curve of the zoom lens group of embodiment 6 having an object distance of 1000mm at 5 times zoom, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 42B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of a zoom lens group having an object distance of 1000mm at 5 times zoom of example 6. Fig. 42C shows a distortion curve of the zoom lens group of embodiment 6 having an object distance of 1000mm at 5 times zoom, which represents distortion magnitude values corresponding to different image heights. Fig. 42D shows a chromatic aberration of magnification curve of the zoom lens group of embodiment 6 having an object distance of 1000mm at 5 times zoom, which represents the deviation of different image heights of light rays on the image plane after passing through the lens. As can be seen from fig. 42A to 42D, the zoom lens group of embodiment 6 with an object distance of 1000mm at 5 times zooming can achieve good imaging quality.
In summary, the optical parameters of examples 1 to 6 are shown in table 21 below, and satisfy the relationships shown in table 22, respectively.
Example parameters 1 2 3 4 5 6
f1(mm) -23.27 -23.61 -23.56 100.00 -24.72 -24.17
f2(mm) 16.76 16.25 16.47 19.65 15.22 18.60
f3(mm) 20.38 21.76 20.83 30.09 24.25 18.62
f4(mm) -7.38 -7.39 -7.32 -8.91 -7.83 -8.01
f5(mm) 7.21 7.33 7.34 7.31 7.46 7.68
f6(mm) 18.54 16.23 16.15 21.41 15.82 19.91
f7(mm) -8.23 -8.14 -8.19 -6.22 -7.87 -11.26
f8(mm) 219.90 1449.88 -1039.83 117.77 561.54 -70.24
TTL(mm) 30.49 30.45 30.36 26.25 28.66 30.60
ImgH(mm) 4.00 4.00 4.00 4.00 4.00 4.00
fG2(mm) 11.03 11.23 11.15 9.79 10.98 10.50
fG3(mm) -13.92 -15.55 -15.65 -8.06 -14.65 -22.53
TABLE 21
Figure DEST_PATH_GDA0002699268820000281
Figure DEST_PATH_GDA0002699268820000282
Figure DEST_PATH_GDA0002699268820000291
Figure DEST_PATH_GDA0002699268820000292
TABLE 22
The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the zoom lens group described above.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (30)

1. The zoom lens assembly, in order from an object side to an image side along an optical axis, comprises:
a first lens group having optical power, including a first lens;
a second lens group having positive optical power, including a second lens, a stop, a third lens, a fourth lens, and a fifth lens arranged in this order along the optical axis;
a third lens group having a negative power, including a sixth lens having a positive power, and a seventh lens, which are arranged in order along the optical axis;
a fourth lens group having power, including an eighth lens;
wherein, an air space is arranged between any two adjacent lenses;
intervals among the first lens group, the second lens group, the third lens group, and the fourth lens group are variable to achieve continuous zooming of the zoom lens group.
2. The zoom lens group of claim 1, wherein the on-axis distance from the object-side surface to the image plane of the first lens, TTL, and the entrance pupil diameter EPD at different zoom powersWSatisfies the following conditions: 4.5<TTL/EPDW<7.0。
3. The zoom lens group of claim 1, wherein the total effective focal length f of the zoom lens group at different zoom factorsWAn air interval T78 on the optical axis with the seventh lens and the eighth lens at different zoom factorsWSatisfies the following conditions: 2.5<fW/T78W<52.0。
4. The zoom lens group of claim 1, wherein the total effective focal length f of the zoom lens group at different zoom factorsWWith the entrance pupil diameter EPD at different zoom factorsWSatisfies the following conditions: 2.5<fW/EPDW<4.5。
5. The zoom lens group of claim 1, wherein the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R3 of the object-side surface of the second lens satisfy: 2.0< R2/R3< 6.5.
6. The zoom lens group of claim 1, wherein the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R5 of the object-side surface of the third lens satisfy: 1.0< R4/R5< 2.0.
7. The zoom lens group of claim 1, wherein the radius of curvature R7 of the object-side surface of the fourth lens, the radius of curvature R9 of the object-side surface of the fifth lens, the radius of curvature R10 of the image-side surface of the fifth lens, and the radius of curvature R11 of the object-side surface of the sixth lens satisfy: -3.5< R11/(R7+ R9+ R10) < 3.0.
8. The zoom lens group of claim 1, wherein the radius of curvature R12 of the image-side surface of the sixth lens and the radius of curvature R13 of the object-side surface of the seventh lens satisfy: 1.0< R13/R12< 2.0.
9. The zoom lens group of claim 1, wherein the maximum field angle | FOV at different zoom powers of the zoom lens groupWI satisfies: 15 degree<|FOVW|<35°。
10. The zoom lens group of claim 1, wherein the radius of curvature R14 of the image-side surface of the seventh lens, the radius of curvature R15 of the object-side surface of the eighth lens, and the radius of curvature R16 of the image-side surface of the eighth lens satisfy: 1.0< | R15+ R16|/R14< 7.5.
11. The zoom lens group of claim 1, wherein the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 1.0< f3/f2< 2.0.
12. The zoom lens group of claim 1, wherein the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: 2.0< f6/f5< 3.0.
13. The zoom lens group of claim 1, wherein an air interval T12 on the optical axis of the first lens and the second lens at different zoom powersWAn air interval T56 on the optical axis between the fifth lens and the sixth lens under different zoom factorsWSatisfies the following conditions: t12 not less than 1.0W/T56W<3.5。
14. The zoom lens group of claim 1, wherein the fourth lens group moves in the optical axis direction with respect to the first lens group;
focusing stroke S of the first lens group and the fourth lens group after the object distance is from infinity to 1 m at different zooming times3X-5XSatisfies the following conditions: 0.5<|S3X-5X|≤1.5。
15. The zoom lens group of claim 1, wherein the combined focal length f of the second lens groupG2Combined focal length f with the third lens groupG3Satisfies the following conditions: -2.5<fG3/fG2<-0.5。
16. The zoom lens assembly, in order from an object side to an image side along an optical axis, comprises:
a first lens group having optical power, including a first lens;
a second lens group having a power, including a second lens, a stop, a third lens, a fourth lens, and a fifth lens arranged in this order along the optical axis;
a third lens group having a power, which includes a sixth lens having a positive power, and a seventh lens, which are arranged in order along the optical axis;
a fourth lens group having power, including an eighth lens;
wherein, an air space is arranged between any two adjacent lenses;
intervals among the first lens group, the second lens group, the third lens group, and the fourth lens group are variable to achieve continuous zooming of the zoom lens group;
an on-axis distance TTL from the object side surface of the first lens to the imaging surface and an entrance pupil diameter EPD under different zoom factorsWSatisfies the following conditions: 4.5<TTL/EPDW<7.0。
17. The zoom lens group of claim 16, wherein the total effective focal length f of the zoom lens group at different zoom factorsWAn air interval T78 on the optical axis with the seventh lens and the eighth lens at different zoom factorsWSatisfies the following conditions: 2.5<fW/T78W<52.0。
18. The zoom lens group of claim 17, wherein the second lens group has positive optical power and the third lens group has negative optical power.
19. The zoom lens group of claim 16, wherein the total effective focal length f of the zoom lens group at different zoom factorsWWith the entrance pupil diameter EPD at different zoom factorsWSatisfies the following conditions: 2.5<fW/EPDW<4.5。
20. The zoom lens group of claim 16, wherein the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R3 of the object-side surface of the second lens satisfy: 2.0< R2/R3< 6.5.
21. The zoom lens group of claim 16, wherein the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R5 of the object-side surface of the third lens satisfy: 1.0< R4/R5< 2.0.
22. The zoom lens group of claim 16, wherein the radius of curvature R7 of the object-side surface of the fourth lens, the radius of curvature R9 of the object-side surface of the fifth lens, the radius of curvature R10 of the image-side surface of the fifth lens and the radius of curvature R11 of the object-side surface of the sixth lens satisfy: -3.5< R11/(R7+ R9+ R10) < 3.0.
23. The zoom lens group of claim 16, wherein the radius of curvature R12 of the image-side surface of the sixth lens and the radius of curvature R13 of the object-side surface of the seventh lens satisfy: 1.0< R13/R12< 2.0.
24. The zoom lens group of claim 16, wherein the maximum field angle | FOV at different zoom powers of the zoom lens groupWI satisfies: 15 degree<|FOVW|<35°。
25. The zoom lens group of claim 16, wherein the radius of curvature R14 of the image-side surface of the seventh lens, the radius of curvature R15 of the object-side surface of the eighth lens, and the radius of curvature R16 of the image-side surface of the eighth lens satisfy: 1.0< | R15+ R16|/R14< 7.5.
26. The zoom lens group of claim 16, wherein the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 1.0< f3/f2< 2.0.
27. The zoom lens group of claim 16, wherein the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: 2.0< f6/f5< 3.0.
28. The zoom lens group of claim 16, wherein an air space T12 on the optical axis of the first and second lenses at different zoom powersWAn air interval T56 on the optical axis between the fifth lens and the sixth lens under different zoom factorsWSatisfies the following conditions: t12 not less than 1.0W/T56W<3.5。
29. The zoom lens group of claim 16, wherein the fourth lens group moves in the optical axis direction with respect to the first lens group;
focusing stroke S of the first lens group and the fourth lens group after the object distance is from infinity to 1 m at different zooming times3X-5XSatisfies the following conditions: 0.5<|S3X-5X|≤1.5。
30. The zoom lens group of claim 16, wherein the combined focal length f of the second lens groupG2Combined focal length f with the third lens groupG3Satisfies the following conditions: -2.5<fG3/fG2<-0.5。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111948793A (en) * 2020-08-21 2020-11-17 浙江舜宇光学有限公司 Zoom lens group

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111948793A (en) * 2020-08-21 2020-11-17 浙江舜宇光学有限公司 Zoom lens group
CN111948793B (en) * 2020-08-21 2024-10-01 浙江舜宇光学有限公司 Zoom lens group

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