Zoom lens
阅读说明：本技术 变焦镜头 (Zoom lens ) 是由 戴付建 徐武超 吴琪 赵烈烽 于 2020-07-27 设计创作，主要内容包括：本申请公开了一种变焦镜头,其沿着光轴由物侧至像侧依序包括：具有光焦度的第一透镜组；具有负光焦度的第二透镜组；具有光焦度的第三透镜组；以及具有光焦度的第四透镜组；通过改变第二透镜组与第三透镜组在光轴上的位置,能够使变焦镜头进行连续变焦；变焦镜头处于长焦状态时的总有效焦距ft与变焦镜头处于广角状态时的总有效焦距fw满足：1.3＜ft/fw＜3.3。(The application discloses a zoom lens, which comprises the following components in order from an object side to an image side along an optical axis: a first lens group having power; a second lens group having negative optical power; a third lens group having power; and a fourth lens group having power; the zoom lens can carry out continuous zooming by changing the positions of the second lens group and the third lens group on the optical axis; the total effective focal length ft when the zoom lens is in a long-focus state and the total effective focal length fw when the zoom lens is in a wide-angle state meet the following conditions: 1.3 < ft/fw < 3.3.)
1. The zoom lens, in order from an object side to an image side along an optical axis, comprises:
a first lens group having power;
a second lens group having negative optical power;
a third lens group having power; and
a fourth lens group having a focal power,
the zoom lens can be subjected to continuous zooming by changing the positions of the second lens group and the third lens group on the optical axis; and
the total effective focal length ft when the zoom lens is in a long-focus state and the total effective focal length fw when the zoom lens is in a wide-angle state meet the following conditions: 1.3 < ft/fw < 3.3.
2. The zoom lens according to claim 1, wherein an effective focal length F2 of the second lens group and an effective focal length F3 of the third lens group satisfy: -1.5 < F2/F3 < 0.
3. The zoom lens according to claim 1, wherein a total effective focal length fw of the zoom lens in a wide angle state and an effective focal length F1 of the first lens group satisfy: 0.3 < fw/F1 < 1.3.
4. The zoom lens according to claim 1, wherein an effective focal length F4 of the fourth lens group and a total effective focal length ft when the zoom lens is in a telephoto state satisfy: 0.2 < | F4|/(| F4| + ft) < 1.0.
5. The zoom lens according to claim 1, wherein a separation distance Tt12 on the optical axis of the first lens group and the second lens group when the zoom lens is in a telephoto state and a separation distance Tw23 on the optical axis of the second lens group and the third lens group when the zoom lens is in a wide angle state satisfy: 0.5 < Tt12/Tw23 < 1.5.
6. The zoom lens according to claim 1, wherein a separation distance Tt34 on the optical axis of the third lens group and the fourth lens group when the zoom lens is in a telephoto state and a separation distance Tw34 on the optical axis of the third lens group and the fourth lens group when the zoom lens is in a wide angle state satisfy: tw34/Tt34 < 0.2 < 1.0.
7. The zoom lens according to claim 1,
the first lens group includes a first lens and a second lens arranged in order along the optical axis;
the second lens group includes a third lens and a fourth lens arranged in order along the optical axis;
the third lens group includes a fifth lens, a sixth lens, and a seventh lens arranged in this order along the optical axis; and
the fourth lens group includes an eighth lens.
8. The zoom lens according to claim 7, wherein an effective focal length f1 of the first lens, an effective focal length f5 of the fifth lens, and an effective focal length f6 of the sixth lens satisfy: 0.2 < (f6-f5)/f1 < 1.0.
9. The zoom lens according to claim 7, wherein a radius of curvature R1 of an object-side surface of the first lens, a radius of curvature R2 of an image-side surface of the first lens, a radius of curvature R3 of an object-side surface of the second lens, and a radius of curvature R4 of an image-side surface of the second lens satisfy: 0.2 < (R1+ R2)/(R3-R4) < 1.0.
10. The zoom lens, 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 and a second lens arranged in order along the optical axis;
a second lens group having negative optical power, including a third lens and a fourth lens arranged in order along the optical axis;
a third lens group having optical power, including a fifth lens, a sixth lens, and a seventh lens arranged in order along the optical axis; and
a fourth lens group having power, including an eighth lens;
the zoom lens can be continuously zoomed by changing the positions of the second lens group and the third lens group on the optical axis.
Technical Field
The application relates to the field of optical elements, in particular to a zoom lens.
Background
With the continuous development of science and technology, the camera lens of mobile devices such as mobile phones and the like is also rapidly improved. The requirements for the photographing level and the photographing quality of the lens of mobile equipment such as a mobile phone and the like in the market are higher and higher. At present, the mobile phone lens mainly realizes the zooming function in a mode of combining a wide-angle lens, a standard lens and a telephoto lens. However, this method may perform lens switching, resulting in discontinuous zooming. Moreover, the white balance is unstable due to the switching of the lens, and the performance of the lens is greatly lost in the switching process, so that the use effect of a user is poor.
Disclosure of Invention
The present application provides, in order from an object side to an image side along an optical axis, a zoom lens including: a first lens group having power; a second lens group having negative optical power; a third lens group having power; and a fourth lens group having power, the zoom lens being capable of continuous zooming by changing positions of the second lens group and the third lens group on an optical axis; and the total effective focal length ft when the zoom lens is in the telephoto state and the total effective focal length fw when the zoom lens is in the wide-angle state can satisfy: 1.3 < ft/fw < 3.3.
In one embodiment, at least one of the object-side surface of the first lens element to the image-side surface of the eighth lens element is an aspherical mirror surface.
In one embodiment, the effective focal length F2 of the second lens group and the effective focal length F3 of the third lens group may satisfy: -1.5 < F2/F3 < 0.
In one embodiment, the total effective focal length fw of the zoom lens in the wide angle state and the effective focal length F1 of the first lens group may satisfy: 0.3 < fw/F1 < 1.3.
In one embodiment, the effective focal length F4 of the fourth lens group and the total effective focal length ft of the zoom lens in the telephoto state may satisfy: 0.2 < | F4|/(| F4| + ft) < 1.0.
In one embodiment, a separation distance Tt12 on the optical axis of the first lens group and the second lens group when the zoom lens is in a telephoto state and a separation distance Tw23 on the optical axis of the second lens group and the third lens group when the zoom lens is in a wide angle state may satisfy: 0.5 < Tt12/Tw23 < 1.5.
In one embodiment, a separation distance Tt34 on the optical axis of the third lens group and the fourth lens group when the zoom lens is in a telephoto state and a separation distance Tw34 on the optical axis of the third lens group and the fourth lens group when the zoom lens is in a wide angle state may satisfy: tw34/Tt34 < 0.2 < 1.0.
In one embodiment, the first lens group includes a first lens and a second lens arranged in order along an optical axis; the second lens group includes a third lens and a fourth lens arranged in order along the optical axis; the third lens group comprises a fifth lens, a sixth lens and a seventh lens which are arranged in sequence along the optical axis; and the fourth lens group includes an eighth lens.
In one embodiment, the effective focal length f1 of the first lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens may satisfy: 0.2 < (f6-f5)/f1 < 1.0.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R3 of the object-side surface of the second lens, and the radius of curvature R4 of the image-side surface of the second lens may satisfy: 0.2 < (R1+ R2)/(R3-R4) < 1.0.
In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens, the radius of curvature R8 of the image-side surface of the fourth lens, the radius of curvature R9 of the object-side surface of the fifth lens, and the radius of curvature R10 of the image-side surface of the fifth lens may satisfy: 0.3 < (R7+ R8)/(R9-R10) < 1.3.
In one embodiment, a sum Σ CT of a center thickness CT2 of the second lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, and center thicknesses of the first to eighth lenses on the optical axis may satisfy: 0.3 < (CT2+ CT 5)/Sigma CT < 0.8.
In one embodiment, a distance TTL from an object side surface of the first lens to an imaging surface of the zoom lens on the optical axis and a total effective focal length fw when the zoom lens is in a wide-angle state may satisfy: TTL/fw is more than 2.0 and less than 3.5.
In one embodiment, a distance TTL from an object side surface of the first lens to an imaging surface of the zoom lens on the optical axis and a total effective focal length ft when the zoom lens is in a telephoto state may satisfy: TTL/ft is more than 0.8 and less than 1.8.
Another aspect of the present application provides a zoom lens, 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 and a second lens arranged in order along an optical axis; a second lens group having negative power, including a third lens and a fourth lens arranged in order along an optical axis; a third lens group having a refractive power, including a fifth lens, a sixth lens, and a seventh lens arranged in this order along an optical axis; and a fourth lens group having power, including an eighth lens; by changing the positions of the second lens group and the third lens group on the optical axis, the zoom lens can carry out continuous zooming.
In one embodiment, the effective focal length F2 of the second lens group and the effective focal length F3 of the third lens group may satisfy: -1.5 < F2/F3 < 0.
In one embodiment, the total effective focal length fw of the zoom lens in the wide angle state and the effective focal length F1 of the first lens group may satisfy: 0.3 < fw/F1 < 1.3.
In one embodiment, the effective focal length F4 of the fourth lens group and the total effective focal length ft of the zoom lens in the telephoto state may satisfy: 0.2 < | F4|/(| F4| + ft) < 1.0.
In one embodiment, a separation distance Tt12 on the optical axis of the first lens group and the second lens group when the zoom lens is in a telephoto state and a separation distance Tw23 on the optical axis of the second lens group and the third lens group when the zoom lens is in a wide angle state may satisfy: 0.5 < Tt12/Tw23 < 1.5.
In one embodiment, a separation distance Tt34 on the optical axis of the third lens group and the fourth lens group when the zoom lens is in a telephoto state and a separation distance Tw34 on the optical axis of the third lens group and the fourth lens group when the zoom lens is in a wide angle state may satisfy: tw34/Tt34 < 0.2 < 1.0.
In one embodiment, the effective focal length f1 of the first lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens may satisfy: 0.2 < (f6-f5)/f1 < 1.0.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, the radius of curvature R3 of the object-side surface of the second lens, and the radius of curvature R4 of the image-side surface of the second lens may satisfy: 0.2 < (R1+ R2)/(R3-R4) < 1.0.
In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens, the radius of curvature R8 of the image-side surface of the fourth lens, the radius of curvature R9 of the object-side surface of the fifth lens, and the radius of curvature R10 of the image-side surface of the fifth lens may satisfy: 0.3 < (R7+ R8)/(R9-R10) < 1.3.
In one embodiment, a sum Σ CT of a center thickness CT2 of the second lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, and center thicknesses of the first to eighth lenses on the optical axis may satisfy: 0.3 < (CT2+ CT 5)/Sigma CT < 0.8.
In one embodiment, a distance TTL from an object side surface of the first lens to an imaging surface of the zoom lens on the optical axis and a total effective focal length fw when the zoom lens is in a wide-angle state may satisfy: TTL/fw is more than 2.0 and less than 3.5.
In one embodiment, a distance TTL from an object side surface of the first lens to an imaging surface of the zoom lens on the optical axis and a total effective focal length ft when the zoom lens is in a telephoto state may satisfy: TTL/ft is more than 0.8 and less than 1.8.
In one embodiment, the total effective focal length ft when the zoom lens is in the telephoto state and the total effective focal length fw when the zoom lens is in the wide-angle state may satisfy: 1.3 < ft/fw < 3.3.
The zoom lens has the advantages that through reasonable distribution of focal power and optimization of optical parameters, continuous zooming, smooth transition of images in the zooming process, miniaturization and good imaging quality are achieved.
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 configuration diagram showing a zoom lens according to
fig. 2 is a schematic configuration diagram showing an intermediate state in a process of switching from a wide angle state to a telephoto state in a zoom lens according to
fig. 3 is a schematic structural view showing a zoom lens according to
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, in a wide-angle state of the zoom lens of
fig. 5A to 5D respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curves in an intermediate state in the process of switching the zoom lens of
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, in a telephoto state in the zoom lens of
fig. 7 is a schematic configuration diagram showing a zoom lens according to
fig. 8 is a schematic configuration diagram showing an intermediate state in a process of switching from a wide angle state to a telephoto state in a zoom lens according to
fig. 9 is a schematic structural view showing a zoom lens according to
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, in a wide-angle state of the zoom lens of
fig. 11A to 11D respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curves in an intermediate state in the process of switching the zoom lens of
fig. 12A to 12D respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve in a telephoto state of the zoom lens of
fig. 13 is a schematic configuration view showing a zoom lens according to
fig. 14 is a schematic configuration diagram showing an intermediate state in a process of switching from a wide angle state to a telephoto state in a zoom lens according to
fig. 15 is a schematic structural view showing a zoom lens according to
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, in a wide-angle state of the zoom lens of
fig. 17A to 17D respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curves in an intermediate state in the process of switching the zoom lens of
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, in a telephoto state for the zoom lens of
fig. 19 is a schematic configuration view showing a zoom lens according to
fig. 20 is a schematic configuration diagram showing an intermediate state in a process of switching from a wide angle state to a telephoto state in a zoom lens according to
fig. 21 is a schematic structural view showing a zoom lens according to
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, in a wide-angle state of the zoom lens of
fig. 23A to 23D respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curves in an intermediate state in the process of switching the zoom lens of
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, in a telephoto state for the zoom lens of
fig. 25 is a schematic structural view showing a zoom lens according to
fig. 26 is a schematic structural view showing an intermediate state in a process of switching from a wide angle state to a telephoto state of a zoom lens according to
fig. 27 is a schematic structural view showing a zoom lens according to
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, in a wide-angle state of the zoom lens of
fig. 29A to 29D respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curves in an intermediate state in the process of switching the zoom lens of
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, in a telephoto state in the zoom lens of
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 according to an exemplary embodiment of the present application may include four lens groups having power, a first lens group, a second lens group, a third lens group, and a fourth lens group. The four lens groups are arranged in order from an object side to an image side along an optical axis. By changing the positions of the second lens group and the third lens group on the optical axis, the zoom lens can perform continuous zooming.
A zoom lens 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. The first lens and the second lens may constitute a first lens group; the third lens and the fourth lens may constitute a second lens group; the fifth lens, the sixth lens and the seventh lens may constitute a third lens group; the eighth lens may constitute a fourth lens group.
In an exemplary embodiment, the first lens group may have positive power or negative power; the second lens group may have negative power; the third lens group may have positive power or negative power; the fourth lens group may have positive power or negative power.
In an exemplary embodiment, by reasonably distributing the lens composition of each lens group and the power of each lens group, the function of optical continuous zooming can be realized on the premise of ensuring that the main technical parameters of the system meet certain specifications. By reasonably distributing the focal power of each lens group and the focal power of each lens in each lens group and reasonably controlling the spacing distance of each lens group, the whole system can realize the continuous zooming function by changing the spacing distance of each lens group when in work.
In an exemplary embodiment, a zoom lens according to the present application may satisfy: 1.3 < ft/fw < 3.3, where ft is the total effective focal length of the zoom lens in the telephoto state, and fw is the total effective focal length of the zoom lens in the wide angle state. More specifically, ft and fw may further satisfy: 1.4 < ft/fw < 3.1. The zoom lens meets the requirements that ft/fw is more than 1.3 and less than 3.3, and the size of an image plane in a telephoto state and a wide-angle state is combined, so that the continuous zooming range can be effectively controlled, and the zoom lens has a continuous zooming function in a certain range.
In an exemplary embodiment, a zoom lens according to the present application may satisfy: -1.5 < F2/F3 < 0, wherein F2 is the effective focal length of the second lens group and F3 is the effective focal length of the third lens group. More specifically, F2 and F3 may further satisfy: -1.2 < F2/F3 < -0.7. The optical power of the system can be reasonably distributed and the system is ensured to have the function of continuous zooming when the optical power is more than-1.5 and less than F2/F3 and less than 0.
In an exemplary embodiment, a zoom lens according to the present application may satisfy: 0.3 < fw/F1 < 1.3, where fw is a total effective focal length of the zoom lens in a wide angle state, and F1 is an effective focal length of the first lens group. More specifically, fw and F1 further satisfy: fw/F1 is more than 0.4 and less than 0.8. The requirement that fw/F1 is more than 0.3 and less than 1.3 is met, the contribution amount of the first lens group to aberration can be effectively reduced, and the imaging quality of the system is improved.
In an exemplary embodiment, a zoom lens according to the present application may satisfy: 0.2 < | F4|/(| F4| + ft) < 1.0, where F4 is the effective focal length of the fourth lens group, and ft is the total effective focal length when the zoom lens is in the telephoto state. More specifically, F4 and ft may further satisfy: 0.3 < | F4|/(| F4| + ft) < 1.0. The power of the fourth lens group can be effectively controlled, and the system has higher image quality while the main technical parameters of the system are ensured, so that the power of the fourth lens group is effectively controlled, and the power of the fourth lens group is less than 0.2 < | F4|/(| F4| + ft) < 1.0.
In an exemplary embodiment, a zoom lens according to the present application may satisfy: 0.5 < Tt12/Tw23 < 1.5, where Tt12 is an interval distance on the optical axis of the first lens group and the second lens group when the zoom lens is in a telephoto state, and Tw23 is an interval distance on the optical axis of the second lens group and the third lens group when the zoom lens is in a wide angle state. More specifically, Tt12 and Tw23 further may satisfy: 0.6 < Tt12/Tw23 < 1.2. The requirement of 0.5 < Tt12/Tw23 < 1.5 is satisfied, and the moving range of the second lens group can be effectively controlled, so that the function of continuous zooming of the system is realized.
In an exemplary embodiment, a zoom lens according to the present application may satisfy: 0.2 < Tw34/Tt34 < 1.0, where Tt34 is an interval distance on the optical axis of the third lens group and the fourth lens group when the zoom lens is in a telephoto state, and Tw34 is an interval distance on the optical axis of the third lens group and the fourth lens group when the zoom lens is in a wide angle state. More specifically, Tt34 and Tw34 further may satisfy: 0.3 < Tw34/Tt34 < 0.8. The requirement that Tw34/Tt34 is more than 0.2 and less than 1.0 is met, the moving range of the third lens group can be effectively controlled, and the function of continuous zooming of the system is realized.
In an exemplary embodiment, a zoom lens according to the present application may satisfy: 0.2 < (f6-f5)/f1 < 1.0, wherein f1 is the effective focal length of the first lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. More specifically, f6, f5, and f1 may further satisfy: 0.3 < (f6-f5)/f1 < 0.6. Satisfies 0.2 < (f6-f5)/f1 < 1.0, can reasonably distribute the focal power of the system, ensures that the system has better processability and ensures that the system has better image quality.
In an exemplary embodiment, a zoom lens according to the present application may satisfy: 0.2 < (R1+ R2)/(R3-R4) < 1.0, wherein R1 is a radius of curvature of an object-side surface of the first lens, R2 is a radius of curvature of an image-side surface of the first lens, R3 is a radius of curvature of an object-side surface of the second lens, and R4 is a radius of curvature of an image-side surface of the second lens. More specifically, R1, R2, R3 and R4 may further satisfy: 0.4 < (R1+ R2)/(R3-R4) < 0.9. Satisfies 0.2 < (R1+ R2)/(R3-R4) < 1.0, can better control the shapes of the first lens and the second lens, reasonably distribute the focal power of the lenses, improve the processability of the lenses and enable the system to have better image quality.
In an exemplary embodiment, a zoom lens according to the present application may satisfy: 0.3 < (R7+ R8)/(R9-R10) < 1.3, wherein R7 is a radius of curvature of an object-side surface of the fourth lens, R8 is a radius of curvature of an image-side surface of the fourth lens, R9 is a radius of curvature of an object-side surface of the fifth lens, and R10 is a radius of curvature of an image-side surface of the fifth lens. More specifically, R7, R8, R9 and R10 may further satisfy: 0.4 < (R7+ R8)/(R9-R10) < 1.1. Satisfying 0.3 < (R7+ R8)/(R9-R10) < 1.3, the shapes of the fourth lens and the fifth lens can be well controlled, so that the fourth lens and the fifth lens have reduced sensitivities while satisfying optical performance, to improve the performance of the system.
In an exemplary embodiment, a zoom lens according to the present application may satisfy: 0.3 < (CT2+ CT5)/Σ CT < 0.8, where CT2 is the central thickness of the second lens on the optical axis, CT5 is the central thickness of the fifth lens on the optical axis, Σ CT is the sum of the central thicknesses of the first lens to the eighth lens on the optical axis. More specifically, CT2, CT5, and Σ CT further satisfy: 0.3 < (CT2+ CT 5)/Sigma CT < 0.6. The requirement of 0.3 < (CT2+ CT 5)/sigma CT < 0.8 is met, the contribution amount of each lens to the field curvature of the system can be well controlled, the system has smaller field curvature through the matching of each lens, and the imaging quality of the system is improved.
In an exemplary embodiment, a zoom lens according to the present application may satisfy: and 2.0 < TTL/fw < 3.5, wherein TTL is the distance from the object side surface of the first lens to the imaging surface of the zoom lens on the optical axis, and fw is the total effective focal length of the zoom lens in a wide-angle state. More specifically, TTL and fw may further satisfy: TTL/fw is more than 2.0 and less than 3.3. The total effective focal length of the system in a wide-angle state can be effectively controlled within a small range, and the system can be effectively ensured to have a large continuous zooming range.
In an exemplary embodiment, a zoom lens according to the present application may satisfy: 0.8 < TTL/ft < 1.8, wherein TTL is the distance from the object side surface of the first lens to the imaging surface of the zoom lens on the optical axis, and ft is the total effective focal length of the zoom lens in the long-focus state. The total effective focal length of the system in a long-focus state can be effectively controlled within a larger range, and the system is effectively ensured to have a larger continuous zooming range.
In an exemplary embodiment, a zoom lens according to the present application further includes a stop disposed between the second lens group and the third lens group. The application provides a zoom lens with the characteristics of continuous zooming, smooth image transition in the zooming process, miniaturization, high imaging quality and the like. A zoom lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the eight lenses described above. By reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, incident light can be effectively converged, the optical total length of the imaging lens is reduced, the processability of the imaging lens is improved, and the zoom lens is more beneficial to production and processing.
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. Optionally, both the object-side surface and the image-side surface of the first lens are spherical mirror surfaces; the object side surface and the image side surface of each of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are aspheric mirror surfaces.
However, it will be understood by those skilled in the art that the number of lenses constituting the zoom lens may be changed to obtain the respective results and advantages described in the present specification without departing from the technical solution claimed in the present application. For example, although eight lenses are exemplified in the embodiment, the zoom lens is not limited to including eight lenses. The zoom lens may further include other numbers of lenses, if necessary.
Specific examples of zoom lenses applicable to the above-described embodiments are further described below with reference to the drawings.
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