CN117092800A - zoom lens - Google Patents
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- CN117092800A CN117092800A CN202311337751.8A CN202311337751A CN117092800A CN 117092800 A CN117092800 A CN 117092800A CN 202311337751 A CN202311337751 A CN 202311337751A CN 117092800 A CN117092800 A CN 117092800A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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Abstract
The application discloses a zoom lens, which sequentially comprises a diaphragm, a first group with positive focal power and a second group with negative focal power from an object side to an imaging surface along an optical axis; the first group consists of a first lens with positive focal power, a second lens with negative focal power and a third lens with positive focal power in sequence from the object side to the imaging surface along the optical axis; the second group consists of a fourth lens with negative focal power, a fifth lens with focal power, a sixth lens with negative focal power and an optical filter in sequence from the object side to the imaging surface along the optical axis; the zoom lens satisfies the following conditional expression: 1.0<f T /f M <1.3; wherein f T Representing the effective focal length of the zoom lens at the telephoto end, f M Indicating the effective focal length of the zoom lens at the macro end. The zoom lens provided by the application is compatible with a macro imaging function on the basis of realizing the long focal length performance, can realize optical continuous zooming from a long focal length state to a macro state, and greatly improves the experience effect of a user.
Description
Technical Field
The application relates to the technical field of imaging lenses, in particular to a zoom lens.
Background
Along with the continuous upgrading and updating of intelligent terminal products, the development of portable electronic product lenses such as mobile phones and the like is also in rapid progress. Nowadays, in order to achieve high-definition photographing effects of mobile phones and other portable electronic products at different working distances, a solution is generally adopted to ensure high-definition photographing effects of tiny objects or figures and the like at different distances by switching a macro lens and a tele lens.
Based on the above, there is a urgent need for a zoom lens that can be compatible with a macro state on the basis of a tele lens, and the zoom lens is different from a general tele lens, and although the view is consistent, the general tele lens cannot be used as a macro lens, because the general tele lens has a high requirement on focusing distance (working distance), and the general tele lens cannot be focused when the distance is slightly close, that is, the function of simultaneously compatible with the macro state on the basis of the tele lens cannot be achieved, and continuous zooming from the tele state to the macro state cannot be achieved, so that the requirements of the current market cannot be met.
Disclosure of Invention
Therefore, the application aims to provide a zoom lens, which can realize optical continuous zooming from a long focus state to a micro focus state by changing air interval distances among different groups, and the imaging target surface of the lens is always larger than the photosensitive area of a chip in the zooming process, so that pixels are not lost, continuous optical lossless zooming can be well realized, and the experience effect of a user is greatly improved.
The embodiment of the application realizes the aim through the following technical scheme.
The application provides a zoom lens, which sequentially comprises a diaphragm, a first group with positive focal power and a second group with negative focal power from an object side to an imaging surface along an optical axis; the first group consists of a first lens with positive focal power, a second lens with negative focal power and a third lens with positive focal power in sequence from the object side to the imaging surface along the optical axis; the second group consists of a fourth lens with negative focal power, a fifth lens with focal power, a sixth lens with negative focal power and an optical filter in sequence from the object side to the imaging surface along the optical axis; the zoom lens satisfies the following conditional expression: 1.0<f T /f M <1.3; wherein f T Representing the effective focal length f of the zoom lens at the long focal end M Representing the effective focal length of the zoom lens at the macro end.
Compared with the prior art, the zoom lens provided by the application is compatible with a zoom lens for micro-distance (the working distance can reach 10-15 cm recently) imaging on the basis of realizing the long-focus performance, the optical continuous zooming of the lens from a long-focus state to a micro-distance state can be realized by changing the air interval distance between two groups and an imaging surface, the imaging target surface of the lens is always larger than the photosensitive area of a chip in the zooming process, and the pixels cannot be lost; meanwhile, the ultra-high definition imaging can be realized by matching with a 50M imaging chip, and the experience effect of a user is greatly improved.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of a zoom lens at a macro end according to a first embodiment of the present application;
fig. 2 is a schematic structural view of a zoom lens at a telephoto end according to a first embodiment of the present application;
FIG. 3 is a graph showing f-tan θ distortion at the macro end of a zoom lens according to a first embodiment of the present application;
FIG. 4 is a graph showing a field curvature of a zoom lens at a macro end according to a first embodiment of the present application;
FIG. 5 is a graph showing a vertical axis chromatic aberration curve of a zoom lens at a macro end according to a first embodiment of the present application;
FIG. 6 is a graph of f-tan θ distortion at the telephoto end for the zoom lens according to the first embodiment of the present application;
FIG. 7 is a graph showing a field curvature of a zoom lens at a telephoto end according to a first embodiment of the present application;
FIG. 8 is a graph of chromatic aberration of a zoom lens at a telephoto end according to a first embodiment of the present application;
FIG. 9 is a schematic view of a zoom lens at a macro end according to a second embodiment of the present application;
fig. 10 is a schematic structural view of a zoom lens at a telephoto end according to a second embodiment of the present application;
FIG. 11 is a graph of f-tan θ distortion at the macro end of a zoom lens according to a second embodiment of the present application;
FIG. 12 is a graph showing a field curvature of a zoom lens at a macro end according to a second embodiment of the present application;
FIG. 13 is a graph of chromatic aberration of a zoom lens at a macro end according to a second embodiment of the present application;
FIG. 14 is a graph of f-tan θ distortion at the telephoto end for a zoom lens according to a second embodiment of the present application;
FIG. 15 is a graph showing a field curvature of a zoom lens at a telephoto end according to a second embodiment of the present application;
FIG. 16 is a graph of chromatic aberration of a zoom lens at a telephoto end according to a second embodiment of the present application;
FIG. 17 is a schematic view of a zoom lens at a macro end according to a third embodiment of the present application;
FIG. 18 is a schematic view of a zoom lens at a telephoto end according to a third embodiment of the present application;
FIG. 19 is a graph showing f-tan θ distortion at the macro end of a zoom lens according to a third embodiment of the present application;
FIG. 20 is a graph showing a field curvature of a zoom lens at a macro end according to a third embodiment of the present application;
FIG. 21 is a graph of chromatic aberration of a zoom lens at a macro end according to a third embodiment of the present application;
FIG. 22 is a graph of f-tan θ distortion at the telephoto end for a zoom lens according to a third embodiment of the present application;
FIG. 23 is a graph showing a field curvature of a zoom lens at a telephoto end according to a third embodiment of the present application;
fig. 24 is a vertical axis chromatic aberration diagram of a zoom lens at a telephoto end according to a third embodiment of the present application.
Detailed Description
In order that the objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Several embodiments of the application are presented in the figures. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all 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. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Like reference numerals refer to like elements throughout the specification.
In this context, near the optical axis means the area 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 referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," 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. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The zoom lens is a camera lens in which a focal length can be changed within a certain range, so that different wide and narrow angles of view, images of different sizes, different scenery ranges or different working distances can be obtained. The optical zooming of the zoom lens is to change the focal position by moving the lens inside the lens, change the focal length of the lens, and change the angle of view of the lens, thereby realizing the enlargement and reduction of the image. Because the zoom lens can play the role of a plurality of fixed focus lenses, the quantity of photographic equipment carried is reduced and the time for changing the lenses is saved when the user travels, so the zoom lens is widely applied.
In the prior art, the zoom lens mainly realizes the zoom function from a long-focus state to a wide-angle state by changing the shooting range through changing the focal length under the condition of not changing the shooting distance (working distance); however, in the case of a large change in shooting distance, particularly when shooting from a long distance to a short distance (e.g., 10 to 15cm or less), the zoom lens in the prior art cannot achieve focusing shooting, that is, cannot achieve continuous zooming from a telephoto state to a macro state. Based on the above, the application provides the zoom lens, which is compatible with the function of micro-distance (the working distance can reach 10-15 cm recently) imaging on the basis of realizing the long-focus performance, and realizes the optical continuous zooming from a long-focus state to a micro-distance state by changing the air interval distance between the internal lens and the imaging surface.
The application provides a zoom lens, which sequentially comprises a diaphragm, a first group with positive focal power and a second group with negative focal power from an object side to an imaging surface along an optical axis; the first group consists of a first lens with positive focal power, a second lens with negative focal power and a third lens with positive focal power in sequence from the object side to the imaging surface along the optical axis; the second group is composed of a fourth lens with negative focal power, a fifth lens with focal power, a sixth lens with negative focal power and an optical filter in sequence from the object side to the imaging surface along the optical axis.
The zoom lens provided by the application has the advantages that the front diaphragm is designed, namely, the diaphragm is arranged in front of the first lens, so that the head size of the zoom lens is reduced; meanwhile, the diaphragm is positioned at the front end of the optical system, so that the total length of the optical system is shorter, and the occupation ratio of the lens in the whole space is reduced; and the diaphragm position is not influenced by the movement of the component position during zooming, so that the design difficulty of the zooming module can be reduced.
The air interval between the first group and the second group and between the second group and the imaging surface on the optical axis is variable; the zoom lens can realize continuous zooming between the micro-focal end and the tele end by changing the interval distance between the first group and the second group on the optical axis and the interval distance between the second group and the imaging surface on the optical axis.
In some embodiments, the zoom lens satisfies a conditional expression：1.0<f T /f M <1.3; wherein f T Representing the effective focal length f of the zoom lens at the long focal end M Representing the effective focal length of the zoom lens at the macro end. The zoom lens meets the conditions, can be in a certain zoom range, ensures that the image quality is nearly lossless in the process from a long focus state to a micro focus state, and improves the shooting experience of a user.
In the zoom lens provided by the embodiment of the application, the air interval on the optical axis between the first group and the second group and between the second group and the imaging surface is variable; specifically, the zoom lens satisfies the conditional expression: 0.06<T1 T /T1 M <0.5, wherein T1 M Represents the air spacing distance of the first group and the second group on the optical axis at the macro end, T1 T Representing the air separation distance on the optical axis between the first group and the second group at the tele end. The air interval distance between adjacent groups in the micro-focal state and the long-focal state is reasonably distributed, so that the moving amount of the lens group of the zoom lens in the zooming process is reduced, the design of driving the zoom motor is facilitated, the size of the whole zoom lens module can be reduced, the space is saved, and the whole miniaturization of the zoom lens is realized.
In some embodiments, the zoom lens satisfies the conditional expression: 1.0<FOV T /FOV M <1.2, wherein the FOV T Representing the maximum field angle, FOV, of the zoom lens at the telephoto end M Representing the maximum field angle of the zoom lens at the macro end. The zoom lens has the advantages that the change of the shooting picture range of the zoom lens in the long-focus state and the micro-focus state is smaller, the consistent view finding range of the zoom lens under different working distances is ensured, the imaging effect of the micro-focus state is compatible on the basis of ensuring the long-focus performance, and the zoom effect of the lens is better realized.
In some embodiments, the zoom lens satisfies the conditional expression: 1.0<IH T /IH M <1.2; wherein IH T Indicating that the zoom lens is in long focusImage height corresponding to maximum field angle of the end, IH M And representing the image height corresponding to the maximum field angle of the zoom lens at the macro end. The imaging surface size of the zoom system can be kept consistent as much as possible under different working distances, the imaging surface size of the zoom system is ensured to be stable in the continuous zooming process, the pixels realize continuous lossless change, and the high-definition shooting effect of images at a micro-distance end and a tele end is ensured; meanwhile, in the zooming process, the imaging target surface of the lens is always larger than the photosensitive area of the chip, pixels are free from loss, the imaging chip which can be matched with 50M can realize ultra-high definition imaging, and the experience effect of a user is greatly improved.
In some embodiments, the zoom lens satisfies the conditional expression: 1.4<f T /EPD T <1.7, wherein f T Representing the effective focal length of the zoom lens at the tele end, EPD T Representing the entrance pupil diameter of the zoom lens at the telephoto end. The imaging lens has the advantages that the ratio of the effective focal length of the zoom lens at the long focal end to the diameter of the entrance pupil is reasonably controlled, so that the noise influence caused by too weak light can be reduced when the lens images in a dark environment, the imaging quality is effectively improved, the imaging requirements of the zoom lens under different luminous flux conditions can be met, the lens has the characteristics of large aperture and small depth of field, and a small shot main body can be shown in the picture in a larger and clearer image by compressing the space of the picture, so that the imaging lens is beneficial to shooting of a portrait or a tiny object.
In the embodiment of the application, each lens in the zoom lens can adopt different surface type collocations to realize the optical continuous zooming of the zoom lens from a long-focus state to a micro-focus state. Specifically, an object side surface of a first lens in the zoom lens is a convex surface, and an image side surface of the first lens is a concave surface at a paraxial region; 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 object side surface and the image side surface of the third lens are both convex surfaces; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface at a paraxial region; the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; the object-side surface of the sixth lens element may be concave or convex, and the image-side surface of the sixth lens element may be concave at a paraxial region. Other surface type matching can be adopted for each lens in the zoom lens, and the zoom effect can be realized only by the lens, so long as the zoom effect is within the protection scope of the application.
In some embodiments, the fifth lens may employ a positive power lens, and in other embodiments, the fifth lens may also employ a negative power lens; the fifth lens adopts different focal powers, and can realize good zooming imaging effect by matching with other five lenses.
In some embodiments, the zoom lens satisfies the conditional expression: 0.5<f Q1 /f M <1，-0.8<f Q2 /f M <-0.2, where f Q1 Representing the combined focal length of the first group, f Q2 Representing the combined focal length, f, of the second group M Representing the effective focal length of the zoom lens at the macro end. The focal length ratio of each group in the first group and the second group is reasonably distributed, so that negative spherical aberration generated by the first group with positive focal power and positive spherical aberration generated by the second group with negative focal power are balanced in the zooming process, good imaging quality is further obtained, and the effect of high resolution is achieved.
In some embodiments, the zoom lens satisfies the conditional expression: 0.2<(f1+f2+f3)/f M <0.7, wherein f1 represents the effective focal length of the first lens, f2 represents the effective focal length of the second lens, f3 represents the effective focal length of the third lens, f M Representing the effective focal length of the zoom lens at the macro end. The focal length of each lens in the first group is reasonably configured, so that coma correction of an off-axis visual field is enhanced, and meanwhile, field curvature and aberration are well converged, so that the zoom lens has higher resolving power, ultra-high definition imaging can be realized by matching with a 50M imaging chip, and the experience effect of a user is greatly improved.
In some embodiments, the zoom lens satisfies the conditional expression: -1< f1/f2< -0.3, wherein f1 represents the effective focal length of the first lens and f2 represents the effective focal length of the second lens. The lens has the advantages that the focal length ratio of the first lens and the second lens is reasonably set, so that incident light entering the lens can be effectively converged, the correction difficulty of aberration is reduced, and the imaging quality of the zoom lens is improved.
In some embodiments, the zoom lens satisfies the conditional expression: -1< f3/f4< -0.3, wherein f3 represents an effective focal length of the third lens and f4 represents an effective focal length of the fourth lens. The lens can effectively slow down the turning trend of light rays in the continuous zooming process by reasonably setting the focal length ratio of two adjacent lenses in the first group and the second group, effectively correct the aberration and distortion of the off-axis visual field and ensure the high-quality imaging of the lens.
In some embodiments, the zoom lens satisfies the conditional expression: -2<f6/f M <-0.5, wherein f6 represents the effective focal length of the sixth lens, f M Representing the effective focal length of the zoom lens at the macro end. The lens has the advantages that the sixth lens can bear larger negative focal power, aberration caused by the front five lenses can be better corrected, meanwhile, the emergent angle of light rays is properly increased, the lens always has a larger image surface in the conversion process from a long focal state to a micro-distance state, the large imaging target surface effect of the lens is realized, and the imaging chip of 50M can be better matched to realize ultra-high definition imaging.
In some embodiments, the zoom lens satisfies the conditional expression: 7mm < f <10mm,35 DEG < FOV <45 DEG, 6mm < IH <8mm,8.5mm < TTL <10.5mm, wherein f represents the effective focal length of the zoom lens, FOV represents the maximum angle of view of the zoom lens, IH represents the image height corresponding to the maximum angle of view of the zoom lens, and TTL represents the total optical length of the zoom lens. The zoom system can obtain small size, simultaneously has long focal length performance, simultaneously has a large image surface, realizes the large imaging target surface effect of the lens, and can better match with a 50M imaging chip to realize ultra-high definition imaging.
As an implementation mode, the six lenses in the zoom lens can be all plastic lenses, or can be a mixture of glass lenses and plastic lenses; in the application, in order to better reduce the volume and weight of the lens, a six-piece plastic aspherical lens structure is adopted, so that the cost can be effectively reduced, the aberration can be corrected, and an optical performance product with higher cost performance can be provided.
In various embodiments of the present application, when an aspherical lens is used as the lens, the surface shape of the aspherical lens satisfies the following equation:
where z is the distance sagittal height from the aspherical surface vertex when the aspherical surface is at a position of height h in the optical axis direction, c is the paraxial curvature of the surface, k is the quadric coefficient, A 2i The aspherical surface profile coefficient of the 2 i-th order.
In all embodiments of the application, in order to realize the function of compatible micro-distance (the working distance can reach 10-15 cm recently) imaging on the basis of long-focus performance, the application is realized mainly by adjusting and changing the air interval distance between each group and the imaging surface, and the air interval between lenses in each group is kept unchanged; when the interval distance between the two groups and the imaging surface is adjusted, the zoom lens can achieve good imaging quality, and the imaging target surface of the lens is always larger than the photosensitive area of the chip in the zooming process, so that pixels are not lost; and can match the imaging chip of 50M and realize the ultra-high definition imaging, greatly improve user's experience effect.
The zoom lens provided by the application realizes continuous zooming of the lens and keeps high imaging quality by reasonably distributing the focal power duty ratio of the two groups and adjusting and changing the air interval distance between each group and the imaging surface, and simultaneously can effectively collect incident light, reduce the optical total length of the zoom lens and improve the processability of the lens by reasonably matching the focal length, the surface thickness, the center thickness, the on-axis distance and the like of each lens.
When the zoom lens is arranged at the macro end, the focal length of the lens is short, the working object distance can be as short as 10-15 cm, and very fine objects and the like can be shot, so that the macro end is generally used for shooting close-range scenes, and long-range imaging is not very clear at the moment; when the zoom lens is arranged at the long focal end, the focal length is longer, the working object distance is larger and can reach infinity, and objects at a distance can be shot clearly, so that the long focal end is generally used for shooting long scenes, and especially for local close-up. The zoom lens can realize optical continuous zooming from a long focal length end to a micro focal length end, and can meet different use scenes and shooting requirements of users.
The application is further illustrated in the following examples. In the respective embodiments, thicknesses, radii of curvature, material selection portions of the respective lenses in the zoom lens are different, and specific differences can be seen from the parameter tables of the respective embodiments. The following examples are merely preferred embodiments of the present application, but the embodiments of the present application are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present application are intended to be equivalent substitutes within the scope of the present application.
First embodiment
Referring to fig. 1 and fig. 2, schematic structural diagrams of a zoom lens 100 at a macro end and a telephoto end according to a first embodiment of the present application are shown, where the zoom lens 100 includes, in order from an object side to an imaging surface S15 along an optical axis: a diaphragm ST, a first group Q1 having positive optical power, and a second group Q2 having negative optical power.
The first group Q1 sequentially comprises a first lens L1, a second lens L2 and a third lens L3 from the object side to the imaging surface; the second group Q2 includes, in order from the object side to the imaging surface, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an optical filter G1.
Specifically, the first lens L1 has positive optical power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave at a paraxial region.
The second lens element L2 has negative refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave.
The third lens element L3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex.
The fourth lens element L4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is concave at a paraxial region.
The fifth lens element L5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex.
The sixth lens element L6 has negative refractive power, wherein an object-side surface S11 of the sixth lens element is convex at a paraxial region thereof and an image-side surface S12 of the sixth lens element is concave at a paraxial region thereof.
The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all plastic aspherical lenses.
Specifically, the design parameters of each lens of the zoom lens 100 provided in the present embodiment are shown in table 1.
TABLE 1
The air interval distance between the first group Q1 and the second group Q2 on the optical axis is T1, the air interval distance between the second group Q2 and the imaging surface S15 is T2, and the continuous lossless zooming of the lens from the macro state to the tele state or from the tele state to the macro state is realized by changing the air interval distances T1 and T2 of each adjacent group.
Table 2 shows specific parameter values of the air separation distances T1, T2 between two adjacent groups and the imaging surface on the optical axis when the zoom lens 100 is in the macro state (i.e. macro end, the nearest working distance may reach 10 cm) and the tele state (i.e. tele end), and the effective focal length f, the maximum field angle FOV and the image height IH corresponding to the maximum field angle of the zoom lens 100 in different states.
TABLE 2
In the present embodiment, the aspherical parameters of each lens in the zoom lens 100 are shown in table 3.
TABLE 3 Table 3
Referring to fig. 3 to 5, an f-tan θ distortion curve, a field curvature curve, and a vertical axis chromatic aberration curve of the zoom lens 100 at the macro end are shown respectively; referring to fig. 6 to 8, an f-tan θ distortion curve, a field curvature curve, and a vertical axis chromatic aberration curve of the zoom lens 100 at the telephoto end are shown respectively.
From the f-tan θ distortion graphs of fig. 3 and 6, it can be seen that: the optical distortion of the macro end is controlled within + -5.5%, and the optical distortion of the telephoto end is controlled within + -2%, which means that the distortion of the zoom lens 100 at the macro end and the telephoto end is well corrected.
As can be seen from the field curvature graphs of fig. 4 and 7: the curvature of field at the macro end is controlled within + -0.65 mm, and the curvature of field at the telephoto end is controlled within + -0.05 mm, which indicates that the curvature of field of the zoom lens 100 at the macro end and the telephoto end is better corrected.
As can be seen from the vertical axis color difference graphs of fig. 5 and 8: the chromatic aberration of the vertical axis of the macro end at different wavelengths is controlled within +/-11 microns, and the chromatic aberration of the vertical axis of the tele end at different wavelengths is controlled within +/-1.5 microns, which indicates that the chromatic aberration of the vertical axis of the zoom lens 100 at the macro end and the tele end is well corrected.
As can be seen from fig. 3 to 5 and fig. 6 to 8: the zoom lens 100 has a good balance of aberrations during continuous zooming from a macro state to a telephoto state, and good optical imaging quality.
Second embodiment
Referring to fig. 9 and 10, the zoom lens 200 according to the second embodiment of the application is shown in schematic diagrams of a macro end and a telephoto end, wherein the zoom lens 200 according to the present embodiment is substantially the same as the zoom lens 100 according to the first embodiment, and the difference is that the object side surface S11 of the sixth lens is concave, and the thickness and air spacing between the lenses are different.
Specifically, the design parameters of each lens of the zoom lens 200 provided in the present embodiment are shown in table 4.
TABLE 4 Table 4
Table 5 shows specific parameter values of the distances T1, T2 between two adjacent groups and the imaging plane on the optical axis when the zoom lens 200 is in the macro state (i.e., macro end, the closest working distance may reach 15 cm) and the tele state (i.e., tele end), and the effective focal length f, the maximum field angle FOV and the image height IH corresponding to the maximum field angle of the zoom lens 200 in different states.
TABLE 5
In this embodiment, the aspherical parameters of each lens in the zoom lens 200 are shown in table 6.
TABLE 6
Referring to fig. 11 to 13, an f-tan θ distortion curve, a field curvature curve, and a vertical axis chromatic aberration curve of the zoom lens 200 at the macro end are shown respectively; referring to fig. 14 to 16, an f-tan θ distortion curve, a field curvature curve, and a vertical axis chromatic aberration curve of the zoom lens 200 at the telephoto end are shown respectively.
From the f-tan θ distortion graphs of fig. 11 and 14, it can be seen that: the optical distortion of the macro end is controlled within + -5%, and the optical distortion of the tele end is controlled within + -2%, which means that the distortion of the zoom lens 200 at the macro end and the tele end is well corrected.
As can be seen from the field curvature graphs of fig. 12 and 15: the curvature of field at the macro end is controlled within + -0.45 mm, and the curvature of field at the tele end is controlled within + -0.07 mm, which indicates that the curvature of field of the zoom lens 200 at the macro end and tele end is better corrected.
As can be seen from the vertical axis color difference graphs of fig. 13 and 16: the chromatic aberration of the vertical axis of the macro end at different wavelengths is controlled within +/-10 microns, and the chromatic aberration of the vertical axis of the tele end at different wavelengths is controlled within +/-1.5 microns, which indicates that the chromatic aberration of the vertical axis of the zoom lens 200 at the macro end and the tele end is well corrected.
As can be seen from fig. 11 to 13 and fig. 14 to 16: the zoom lens 200 has better balance of aberration and good optical imaging quality in the continuous zooming process from the macro state to the tele state.
Third embodiment
Referring to fig. 17 and 18, there are respectively provided a structure diagram of a zoom lens 300 at a macro end and a telephoto end according to a third embodiment of the present application, wherein the zoom lens 300 in the present embodiment is substantially the same as the zoom lens 100 in the first embodiment, and the difference is that a fifth lens L5 in the zoom lens 300 has negative optical power, an object-side surface S11 of the sixth lens is a concave surface, and related parameters such as thickness and air space between the lenses are different.
Specifically, the design parameters of each lens of the zoom lens 300 provided in the present embodiment are shown in table 7.
TABLE 7
Table 8 shows specific parameter values of the distances T1, T2 between two adjacent groups and the imaging plane on the optical axis when the zoom lens 300 is in the macro state (i.e., macro end, the closest working distance may reach 15 cm) and the tele state (i.e., tele end), and the effective focal length f, the maximum field angle FOV and the image height IH corresponding to the maximum field angle of the zoom lens 300 in different states.
TABLE 8
In this embodiment, the aspherical parameters of each lens in the zoom lens 300 are shown in table 9.
TABLE 9
Referring to fig. 19 to 21, an f-tan θ distortion curve, a field curvature curve, and a vertical axis chromatic aberration curve of the zoom lens 300 at the macro end are shown respectively; referring to fig. 22 to 24, an f-tan θ distortion curve, a field curvature curve, and a vertical axis chromatic aberration curve of the zoom lens 300 at the telephoto end are shown.
From the f-tan θ distortion graphs of fig. 19 and 22, it can be seen that the optical distortion at the macro end is controlled to be within ±4.5%, and the optical distortion at the telephoto end is controlled to be within ±1%, which means that the distortion of the zoom lens 300 at the macro end and the telephoto end is well corrected.
As can be seen from the field curvature graphs of fig. 20 and 23: the curvature of field at the macro end is controlled within + -0.45 mm, and the curvature of field at the telephoto end is controlled within + -0.03 mm, which indicates that the curvature of field of the zoom lens 300 at the macro end and the telephoto end is better corrected.
As can be seen from the vertical axis color difference graphs of fig. 21 and 24: the chromatic aberration of the vertical axis of the macro end at different wavelengths is controlled within +/-3 microns, and the chromatic aberration of the vertical axis of the tele end at different wavelengths is controlled within +/-2.5 microns, which indicates that the chromatic aberration of the vertical axis of the zoom lens 300 at the macro end and the tele end is well corrected.
As can be seen from fig. 19 to 21 and fig. 22 to 24: the zoom lens 300 has good balance of aberration during continuous zooming from a macro state to a telephoto state, and good optical imaging quality.
Referring to Table 10, the optical characteristics of the zoom lens provided in the above three embodiments, including the maximum field angle FOV of the zoom lens at the macro end M Effective focal length f M Image height IH corresponding to maximum field angle M The method comprises the steps of carrying out a first treatment on the surface of the Maximum field angle FOV of zoom lens at long focal end T Effective focal length f T Image height IH corresponding to maximum field angle T And a correlation value corresponding to each of the foregoing conditional expressions.
Table 10
As can be seen from tables 2, 5 and 8 of the above three examples: when the air interval distance T1 between the first group Q1 and the second group Q2 on the optical axis is adjusted to a larger value, and the air interval distance T2 between the second group Q2 and the imaging surface S15 is adjusted to a smaller value, the zoom lens is in a macro state; conversely, when the air separation distance T1 between the first group Q1 and the second group Q2 on the optical axis is adjusted to be a smaller value, and the air separation distance T2 between the second group Q2 and the imaging surface S15 is adjusted to be a larger value, the zoom lens is in a tele state; when T1, T2 are adjusted to intermediate values, the zoom lens is in some intermediate states from the macro state to the tele state. When the zoom lens provided by the embodiment of the application is mounted on imaging equipment for use, the air interval distances T1 and T2 of two adjacent groups and the imaging surface on the optical axis are adjusted along with the change of the working distance (the distance of a required shooting main body is different), so that the optical continuous zooming of the zoom lens from a micro-focal state to a long-focal state is realized. In the continuous zooming process, the total optical length TTL of the zoom lens is not basically changed; the variation range of the maximum field angle FOV of the lens is smaller, so that the zoom lens can be effectively ensured to have consistent view finding range as far as possible under different working distances; the variation amplitude of the image height IH corresponding to the maximum field angle of the lens is also smaller, the imaging surface size of the zoom system can be effectively ensured to be stable in the continuous zooming process, the pixels are continuously and nondestructively changed, the high-definition shooting effect in the zooming process is ensured, meanwhile, the imaging target surface of the lens is always larger than the photosensitive area of the chip in the zooming process, the pixels are not lost, the ultra-high-definition imaging can be realized by matching with the 50M imaging chip, and the experience effect of a user is greatly improved.
In summary, in the zoom lens provided by the application, as the focal power of each group is reasonably arranged and the focal power, the surface, the thickness, the spacing and the like of each lens in the group are reasonably matched, the optical continuous zooming of the lens from a long-focus state to a micro-focus state can be realized by changing the air interval distance between the two groups and the imaging surface, and the imaging target surface of the lens is always larger than the photosensitive area of the chip in the zooming process, so that the pixels cannot be lost; meanwhile, the imaging chip of 50M can be matched to realize high-definition imaging, and the experience effect of a user is greatly improved.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (12)
1. A zoom lens is characterized in that the zoom lens sequentially comprises a diaphragm, a first group with positive focal power and a second group with negative focal power from an object side to an imaging surface along an optical axis;
the first group consists of a first lens with positive focal power, a second lens with negative focal power and a third lens with positive focal power in sequence from the object side to the imaging surface along the optical axis;
the second group consists of a fourth lens with negative focal power, a fifth lens with focal power, a sixth lens with negative focal power and an optical filter in sequence from the object side to the imaging surface along the optical axis;
the zoom lens satisfies the following conditional expression: 1.0<f T /f M <1.3; wherein f T Representing the effective focal length f of the zoom lens at the long focal end M Representing the effective focal length of the zoom lens at the macro end.
2. The zoom lens according to claim 1, wherein an air interval on an optical axis between the first group and the second group and between the second group and the imaging surface is variable;
the zoom lens satisfies the following conditional expression: 0.06<T1 T /T1 M <0.5, wherein T1 M Represents the air spacing distance of the first group and the second group on the optical axis at the macro end, T1 T Representing the air separation distance on the optical axis between the first group and the second group at the tele end.
3. The zoom lens according to claim 1, wherein the zoom lens satisfies a conditional expression: 1.0<FOV T /FOV M <1.2, wherein the FOV T Representing the maximum field angle, FOV, of the zoom lens at the telephoto end M Representing the maximum field angle of the zoom lens at the macro end.
4. The zoom lens according to claim 1, wherein the zoom lens satisfies a conditional expression: 1.0<IH T /IH M <1.2; wherein IH T Representing the image height corresponding to the maximum field angle of the zoom lens at the long focal end, IH M And representing the image height corresponding to the maximum field angle of the zoom lens at the macro end.
5. The zoom lens according to claim 1, wherein the zoom lens satisfies a conditional expression: 1.4<f T /EPD T <1.7, wherein f T Representing the effective focal length of the zoom lens at the tele end, EPD T Representing the entrance pupil diameter of the zoom lens at the telephoto end.
6. The zoom lens of claim 1, wherein the lens is formed of a lens material having a refractive index,
the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface at a paraxial region;
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 object side surface and the image side surface of the third lens are both convex surfaces;
the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a concave surface at a paraxial region;
the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface;
the image side surface of the sixth lens is concave at a paraxial region.
7. The zoom lens according to claim 1, wherein the zoom lens satisfies a conditional expression: 0.5<f Q1 /f M <1, wherein f Q1 Representing the combined focal length of the first group, f M Representing the effective focal length of the zoom lens at the macro end.
8. The zoom lens according to claim 1, wherein the zoom lens satisfies a conditional expression: -0.8<f Q2 /f M <-0.2, where f Q2 Representing the combined focal length, f, of the second group M Representing the effective focal length of the zoom lens at the macro end.
9. The zoom lens according to claim 1, wherein the zoom lens satisfies a conditional expression: 0.2<(f1+f2+f3)/f M <0.7, wherein f1 represents the effective focal length of the first lens, f2 represents the effective focal length of the second lens, f3 represents the effective focal length of the third lens, f M Representing the effective focal length of the zoom lens at the macro end.
10. The zoom lens according to claim 1, wherein the zoom lens satisfies a conditional expression: -1< f1/f2< -0.3, wherein f1 represents the effective focal length of the first lens and f2 represents the effective focal length of the second lens.
11. The zoom lens according to claim 1, wherein the zoom lens satisfies a conditional expression: -1< f3/f4< -0.3, wherein f3 represents an effective focal length of the third lens and f4 represents an effective focal length of the fourth lens.
12. The zoom lens according to claim 1, wherein the zoom lens satisfies a conditional expression: -2<f6/f M <-0.5, wherein f6 represents the effective focal length of the sixth lens, f M Representing the effective focal length of the zoom lens at the macro end.
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