CN119376082B

CN119376082B - Optical lens

Info

Publication number: CN119376082B
Application number: CN202411945749.3A
Authority: CN
Inventors: 张若龙; 李旦; 胡露; 李亮
Original assignee: Jiangxi Lianyi Optics Co Ltd
Current assignee: Jiangxi Lianyi Optics Co Ltd
Priority date: 2024-12-27
Filing date: 2024-12-27
Publication date: 2025-04-29
Anticipated expiration: 2044-12-27
Also published as: CN119376082A

Abstract

The present invention provides an optical lens, which includes: a first group with negative optical power and a second group with positive optical power in sequence from the object side to the imaging surface along the optical axis; the first group is a fixed lens group, including a first lens with negative optical power; the second group is a focusing lens group, which includes a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power and a sixth lens with positive optical power in sequence from the object side to the imaging surface; 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 focal length fa of the first group and the focal length fb of the second group satisfy: ‑20<fa/fb<‑3. The optical lens provided by the present invention can realize optical continuous zooming of the lens from a wide-angle state to a macro state, and can achieve the excellent effect of compatibility between wide-angle shooting and macro shooting.

Description

Optical lens

Technical Field

The invention relates to the technical field of imaging lenses, in particular to an optical lens.

Background

With the rapid development of intelligent mobile equipment shooting technology, the performance requirements of users on cameras are also increasing. In order to meet the diversified shooting requirements, cameras have been developed from single-lens to multiple configurations of double-lens, triple-lens, or even four-lens. However, the limited size of the mobile device and the trend of light and thin hand feeling are limited, and the lens configuration using a plurality of lenses for meeting shooting requirements in different occasions is not feasible. Therefore, in order to realize diversified shooting requirements, a design scheme and a lens development concept that one lens is compatible with multiple shooting effects can be adopted, which is necessarily the development direction of miniaturization of the shooting module in the mobile device.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide an optical lens, which can realize optical continuous zooming from a wide-angle state to a macro state by changing air spacing distances between different groups, thereby greatly improving experience effects of users.

The invention adopts the technical scheme that:

an optical lens is composed of six lenses, and sequentially comprises a first group with negative focal power and a second group with positive focal power from an object side to an imaging surface along an optical axis;

the first group is a fixed lens group and comprises a first lens with negative focal power;

The second group is a focusing lens group, and sequentially comprises a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power and a sixth lens with positive focal power from the object side to the imaging surface;

The second group is dynamically movable on the optical axis;

Wherein the focal length fa of the first group and the focal length fb of the second group meet-20 < fa/fb < -3.

Further preferably, the second group moves along the optical axis to realize the switching of the optical lens in a wide-angle state and a macro state, when the optical lens is switched from the wide-angle state at infinity to the macro state with the object distance of 10cm, the moving amount of the second group along the optical axis is smaller than 0.08mm, and when the optical lens is switched from the wide-angle state at infinity to the macro state with the object distance of 3cm, the moving amount of the second group along the optical axis is smaller than 0.25mm.

Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy-20 < f1/f < -3.

Further preferably, the focal length f2 of the second lens and the focal length fb of the second group satisfy 0.8< f2/fb <1.5.

Further preferably, the focal length f3 of the third lens and the focal length fb of the second group satisfy-1.8 < f3/fb < -1.

Further preferably, the focal length f4 of the fourth lens and the focal length fb of the second group satisfy 0.5< f4/fb <1.5.

Further preferably, the focal length f5 of the fifth lens and the focal length fb of the second group satisfy-4 < f5/fb < -1.

Further preferably, the focal length f6 of the sixth lens and the focal length fb of the second group satisfy 2< f6/fb <12.

Further preferably, the object-side effective aperture DM11 of the first lens and the object-side effective aperture DM21 of the second lens satisfy 1.8< DM11/DM21<2.8, and the object-side effective aperture DM21 of the second lens and the image-side effective aperture DM62 of the sixth lens satisfy 0.3< DM21/DM62<0.6.

Further preferably, the total optical length TTL of the optical lens and the back focal length BFL of the optical lens meet 4.5< TTL/BFL <8.

Further preferably, the optical total length TTL of the optical lens and the effective focal length f of the optical lens meet 1.8< TTL/f <2.8.

Further preferably, the image side surface of the second lens element is convex, the object side surface of the third lens element is convex, the image side surface of the third lens element is concave, the object side surface of the fourth lens element is convex, the image side surface of the fourth lens element is convex, the object side surface of the fifth lens element is concave, the object side surface of the sixth lens element is convex in a paraxial region, and the image side surface of the sixth lens element is concave in a paraxial region.

Compared with the prior art, the optical lens provided by the invention can well realize continuous optical zooming, can realize optical continuous zooming from a wide-angle state to a micro-distance state by changing the air interval distance between different groups, can realize excellent compatible effects of wide-angle shooting and micro-distance shooting, has one or more advantages of miniaturization, wide-field, high-quality imaging and the like, and greatly improves the experience effect of users.

Drawings

The foregoing and/or additional aspects and advantages of the invention 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 diagram of the structure of an optical lens in a wide-angle state in embodiment 1 of the present invention.

Fig. 2 is an axial aberration diagram of the optical lens in the wide-angle state in embodiment 1 of the present invention.

Fig. 3 is a graph showing chromatic aberration of magnification of the optical lens in the wide-angle state in embodiment 1 of the present invention.

Fig. 4 is an axial aberration diagram of the optical lens in the embodiment 1 of the present invention at a micro distance of 10 cm.

Fig. 5 is a graph showing chromatic aberration of magnification of an optical lens in a 10cm macro state in embodiment 1 of the present invention.

Fig. 6 is an axial aberration diagram of the optical lens in the 3cm macro state in embodiment 1 of the present invention.

Fig. 7 is a graph showing chromatic aberration of magnification of an optical lens in a 3cm macro state in embodiment 1 of the present invention.

Fig. 8 is a schematic diagram of the structure of the optical lens in the wide-angle state in embodiment 2 of the present invention.

Fig. 9 is an axial aberration diagram of the optical lens in the wide-angle state in embodiment 2 of the present invention.

Fig. 10 is a graph showing chromatic aberration of magnification of the optical lens in the wide-angle state in embodiment 2 of the present invention.

Fig. 11 is an axial aberration diagram of the optical lens in the 10cm macro state in embodiment 2 of the present invention.

Fig. 12 is a graph showing chromatic aberration of magnification of an optical lens in a 10cm macro state in embodiment 2 of the present invention.

Fig. 13 is an axial aberration diagram of the optical lens in example 2 of the present invention at a 3cm macro state.

Fig. 14 is a graph showing chromatic aberration of magnification of an optical lens in a 3cm macro state in embodiment 2 of the present invention.

Fig. 15 is a schematic diagram of the structure of an optical lens in a wide-angle state in embodiment 3 of the present invention.

Fig. 16 is an axial aberration diagram of the optical lens in the wide-angle state in embodiment 3 of the present invention.

Fig. 17 is a graph showing chromatic aberration of magnification of an optical lens in a wide-angle state in embodiment 3 of the present invention.

Fig. 18 is an axial aberration diagram of the optical lens in example 3 of the present invention at a micro distance of 10 cm.

Fig. 19 is a graph showing chromatic aberration of magnification of an optical lens in a 10cm macro state in example 3 of the present invention.

Fig. 20 is an axial aberration diagram of an optical lens in 3cm macro according to embodiment 3 of the present invention.

Fig. 21 is a graph showing chromatic aberration of magnification of an optical lens in a 3cm macro state in example 3 of the present invention.

The invention will be further described in the following detailed description in conjunction with the above-described figures.

Detailed Description

For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of embodiments of the application and are not intended to limit the scope of the 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 the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present invention.

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are 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, and 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.

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, 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 optical lens provided by the embodiment of the invention is a zoom lens and consists of six lenses, and the zoom lens sequentially comprises a first group with negative focal power and a second group with positive focal power from the object side to an imaging surface along an optical axis. The first group is a fixed lens group that does not move when the optical lens is in focus, and includes a first lens having negative optical power. The second group is a focusing lens group, and can perform micro movement along the optical axis in the optical lens to complete the switching of the optical lens in the wide-angle state and the macro state. The second group includes, in order from the object side to the imaging surface, a second lens having positive optical power, a third lens having negative optical power, a fourth lens having positive optical power, a fifth lens having negative optical power, and a sixth lens having positive optical power. According to the invention, the air interval between the first group and the second group and the air interval between the second group and the imaging surface on the optical axis are variable, and the optical continuous zooming of the lens from the wide-angle state to the macro state can be realized by changing the air interval distance between different groups.

In some embodiments, the object-side surface of the first lens is concave or convex, and the image-side surface of the first lens is concave or convex. The object side surface of the second lens is concave or convex, and the image side surface of the second lens is convex. The object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface. The fourth lens element has a convex object-side surface and a convex image-side surface. The object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface or a convex surface. The object side surface of the sixth lens element is convex in a paraxial region, and the image side surface of the sixth lens element is concave in a paraxial region.

In some embodiments, the optical lens may further include a diaphragm, and the diaphragm may be located between the second lens and the third lens. It will be appreciated that the aperture is used to limit the amount of light entering to vary the brightness of the image. When the diaphragm is located between the second lens and the third lens, correction of the diaphragm aberration is facilitated.

In some embodiments, the optical lens may further include an optical filter disposed between the sixth lens element and the imaging surface. The optical filter is used for filtering the interference light and preventing the interference light from reaching the imaging surface of the optical lens to influence normal imaging.

In some embodiments, the focal length fa of the first group and the focal length fb of the second group satisfy-20 < fa/fb < -3. The focal length relation between the fixed lens group and the focusing lens group is reasonably distributed, so that the luminous flux and the aperture size of the optical lens can be effectively improved, the processing difficulty of the first lens is reduced, the deflection angle of light rays in different focusing states of the optical lens can be reduced, the correction of optical aberration is facilitated, and the higher imaging quality of the lens in different focusing states is ensured.

In some embodiments, movement of the second group along the optical axis effects switching of the optical lens in the wide-angle state and the macro state. When the optical lens is switched from a wide-angle state at an infinite distance from an object distance to a macro state at an object distance of 10cm, the second group moves from the image side to the object side along the optical axis, and the movement amount of the second group along the optical axis is smaller than 0.08mm. When the optical lens is switched from a wide-angle state at an infinite distance from an object distance to a micro-distance state at an object distance of 3cm, the second group moves from the image side to the object side along the optical axis, and the movement amount of the second group along the optical axis is smaller than 0.25mm. It can be understood that the second group can achieve the compatible effect of wide-angle shooting (wide-angle state) and macro shooting (macro state) by performing small displacement along the optical axis, and has good imaging effect in both states. The optical lens has a short focusing stroke, can effectively inhibit aberration problem caused by focusing the lens and improve focusing performance of the lens, thereby realizing excellent effect of compatibility of wide-angle shooting and macro shooting. In addition, the volume of the motor for driving the second group (focusing lens group) to move is also reduced, which is beneficial to the realization of miniaturization of the camera module.

In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy-20 < f1/f < -3. The optical lens can stably absorb light rays with different object distances at different angles by reasonably controlling the focal length ratio of the fixed lens group, and the stability of the optical lens in the focusing process is improved.

In some implementations, the focal length f2 of the second lens and the focal length fb of the second group satisfy 0.8< f2/fb <1.5. The lens has the advantages that the conditions are met, the large-range light rays entering the system can be effectively converged, the light rays which are caused by the fact that the focal power of the first lens is too concentrated are prevented from being excessively bent, and the correction difficulty of aberration is reduced.

In some embodiments, the focal length f3 of the third lens and the focal length fb of the second group satisfy-1.8 < f3/fb < -1. The third lens element with high negative refractive power can collect light rays entering the rear side from the fixed lens element assembly as much as possible, increase luminous flux, realize large-angle light ray collection of the lens element, and better realize large field angle and large aperture performance of the lens element.

In some implementations, the focal length f4 of the fourth lens and the focal length fb of the second group satisfy 0.5< f4/fb <1.5. The light can be effectively converged and the spherical aberration and astigmatism of the system can be effectively corrected by meeting the conditions.

In some embodiments, the focal length f5 of the fifth lens and the focal length fb of the second group satisfy-4 < f5/fb < -1. The fifth lens element can have a proper negative refractive power, and the degree of deflection of the light beam passing through the fifth lens element can be alleviated, thereby effectively correcting the aberration of the optical lens element.

In some implementations, the focal length f6 of the sixth lens and the focal length fb of the second group satisfy 2< f6/fb <12. The above conditions are met, and the focal length ratio of the sixth lens is reasonably controlled, so that the overlarge incident angle of light reaching the imaging surface can be prevented, the light receiving efficiency of the photosensitive element and the stable imaging of the optical lens are affected, and the imaging quality is reduced.

In some embodiments, the object-side effective aperture DM11 of the first lens element and the object-side effective aperture DM21 of the second lens element satisfy 1.8< DM11/DM21<2.8, and the object-side effective aperture DM21 of the second lens element and the image-side effective aperture DM62 of the sixth lens element satisfy 0.3< DM21/DM62<0.6. The lens has the advantages that the fixed lens group is arranged to have a larger caliber, so that light rays in a larger range can enter the system in the focusing process from a wide angle to a micro-distance, the lens is ensured to have a larger angle of view in different focusing states, and the focusing performance of the lens is improved.

In some embodiments, the total optical length TTL of the optical lens and the back focal length BFL of the optical lens satisfy 4.5< TTL/BFL <8. The conditions are met, the off-axis aberration of the optical lens is balanced, the sensitivity is reduced, and meanwhile, enough space can be reserved for automatic focusing of the optical lens, so that the optical lens is ensured to have high-performance imaging effects in two states of wide angle and micro distance.

In some embodiments, the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy 1.8< TTL/f <2.8. The length of the lens can be effectively limited by meeting the conditions, and the miniaturization of the optical lens is facilitated.

In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the total optical length TTL of the optical lens satisfy 0.9< TTL/IH <1.35. The lens can be miniaturized well under the condition that the conditions are met, and the lens has a larger image surface and can be imaged well under the condition that the same total length of the lens is ensured.

In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy 0.8< f2/f <1.5. The lens has the advantages that the conditions are met, the large-range light rays entering the system can be effectively converged, the light rays which are caused by the fact that the focal power of the first lens is too concentrated are prevented from being excessively bent, and the correction difficulty of aberration is reduced.

In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy-1.8 < f3/f < -1. The third lens element with high negative refractive power can collect light rays entering the rear side from the fixed lens element assembly as much as possible, increase luminous flux, realize large-angle light ray collection of the lens element, and better realize large field angle and large aperture performance of the lens element.

In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy 0.5< f4/f <1.3. The light can be effectively converged and the spherical aberration and astigmatism of the system can be effectively corrected by meeting the conditions.

In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy-4.5 < f5/f < -1. The fifth lens element can have a proper negative refractive power, and the degree of deflection of the light beam passing through the fifth lens element can be alleviated, thereby effectively correcting the aberration of the optical lens element.

In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy 2< f6/f <12. The above conditions are met, and the focal length ratio of the sixth lens is reasonably controlled, so that the overlarge incident angle of light reaching the imaging surface can be prevented, the light receiving efficiency of the photosensitive element and the stable imaging of the optical lens are affected, and the imaging quality is reduced.

In some embodiments, the object-side radius of curvature R1 of the first lens and the image-side radius of curvature R2 of the first lens satisfy 0.5< R1/R2<2. The surface type of the first lens is reasonably controlled to effectively correct the spherical aberration of the system, improve the processability of the lens and reduce the influence of the tolerance of the first lens on the stability of the optical lens.

In some implementations, the object-side radius of curvature R5 of the third lens and the image-side radius of curvature R6 of the third lens satisfy 1.5< R5/R6<5. The surface shape of the third lens can be reasonably set to be favorable for correcting off-axis aberration, the light rays can have proper incidence and emergent angles on the third lens, and the imaging quality of the optical lens is improved while the processing feasibility of the third lens is ensured.

In some embodiments, the object-side radius of curvature R7 of the fourth lens and the image-side radius of curvature R8 of the fourth lens satisfy-5 < R7/R8< -0.5. The above conditions are satisfied, so that the deflection degree of the light rays passing through the fourth lens can be alleviated, and the spherical aberration and astigmatism of the system can be effectively corrected.

In some embodiments, the air gap H2 of the first group and the second group on the optical axis and the back focal length BFL of the optical lens satisfy 0.3< H2/BFL <2.3. The above conditions are met, and the space is reserved for the movement of the focusing lens group in the focusing process of the optical lens by controlling the rationality of the fixed lens group and the focusing lens group in structural design, so that interference among structural components is prevented; meanwhile, the optical lens has a short focusing stroke, so that the aberration problem caused by focusing the lens can be effectively restrained, the focusing performance of the lens is improved, and the excellent effect of compatibility of wide-angle shooting and macro shooting is realized.

In some implementations, the focal length fb of the second group and the effective focal length f of the optical lens satisfy 0.6< fb/f <1.2. The second group has proper focal length, which is helpful to the correction of optical aberration and ensures the higher imaging quality of the lens in different focusing states.

In some embodiments, the optical lens satisfies the conditional expression of 2mm < f <2.5mm,80 DEG < FOV <93 DEG, 4mm < TTL <6mm,1.8< FNo <2.2,4mm < IH <5mm, wherein f represents the effective focal length of the optical lens, FOV represents the maximum field angle of the optical lens, TTL represents the total optical length of the optical lens, FNo represents the aperture value of the optical lens, IH represents the real image height corresponding to the maximum field angle of the optical lens. The optical lens provided by the embodiment of the invention has the characteristics of miniaturization, larger field angle, large aperture and the like.

In some embodiments, the lens material in the optical lens provided by the present invention may be glass or plastic. When the lens is made of plastic, the production cost can be effectively reduced. In addition, when the lens is made of glass, the geometrical chromatic aberration of the optical system can be effectively corrected through the characteristic of low chromatic dispersion of the glass. The optical lens provided by the invention can adopt a full plastic lens structure, so that the lens has excellent imaging performance, the structure of the lens is compact, and the miniaturization and the high image quality balance of the lens can be better realized.

In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens may be spherical lenses or aspherical lenses, and compared with spherical structures, the aspherical structures can effectively reduce the aberration of the optical system, so that the number of lenses and the size of the lenses are reduced, and miniaturization of the lens is better achieved. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens can be aspheric lenses, so that the aberration of the optical lens can be effectively reduced, the number of lenses is reduced, the size of the lenses is reduced, and miniaturization of the lens is better realized.

In various embodiments of the present invention, when an aspherical lens is used as the lens, each aspherical surface shape of the optical lens satisfies the following equation:

;

Wherein z is the distance between the curved surface and the curved surface vertex in the optical axis direction, h is the distance between the optical axis and the curved surface, c is the curvature of the curved surface vertex, K is the quadric surface coefficient, B, C, D, E, F, G, H is the fourth-order, sixth-order, eighth-order, tenth-order, fourteen-order and sixteen-order curved surface coefficients respectively.

The invention is further illustrated in the following examples. In various embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical lens may vary, and for specific differences, reference may be made to the parameter tables of the various embodiments. The following examples are merely preferred embodiments of the present invention, but the embodiments of the present invention 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 invention are intended to be equivalent substitutes within the scope of the present invention.

Example 1

Referring to fig. 1, a schematic diagram of an optical lens 100 in a wide-angle state according to an embodiment 1 of the present invention is shown, and the optical lens includes, in order from an object side to an imaging plane along an optical axis, a first group Q1 having negative optical power, a second group Q2 having positive optical power, and an optical filter G1.

The first group Q1 includes a first lens element L1 with negative refractive power, a concave object-side surface S1 and a convex image-side surface S2.

The second group Q2 includes, in order from the object side to the imaging surface, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.

The second lens element L2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex;

the third lens element L3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave;

The fourth lens element L4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex;

the fifth lens element L5 has negative refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex;

The sixth lens element L6 has positive refractive power, wherein an object-side surface S11 thereof is convex at a paraxial region thereof and an image-side surface S12 thereof is concave at the paraxial region thereof.

In order to better reduce the volume and weight of the lens, 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 aspheric lenses, 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.

The relevant parameters of each lens in the optical lens 100 in embodiment 1 are shown in table 1-1.

TABLE 1-1

The surface profile parameters of the aspherical lens of the optical lens 100 in example 1 are shown in tables 1-2.

TABLE 1-2

In table 1-1, H1 is an air gap between the first group Q1 and the object on the object side on the optical axis, H2 is an air gap between the first group Q1 and the second group Q2 on the optical axis, and H3 is an air gap between the second group Q3 and the imaging plane on the optical axis.

Specifically, the first group Q1 is a fixed lens group and does not move when the optical lens focuses, and the second group Q2 is a focusing lens group, and micro-movement can be performed along the optical axis in the optical lens to complete the switching of the optical lens in a wide-angle state and a macro state. When the optical lens is switched from the wide-angle state at infinity to the macro state at an object distance of 10cm, the second group Q2 moves from the image side to the object side along the optical axis with a focusing stroke (i.e., a focusing lens group moving amount) of 0.058mm, and when the optical lens is switched from the wide-angle state at infinity to the macro state at an object distance of 3cm, the second group Q2 moves from the image side to the object side along the optical axis with a focusing stroke of 0.187mm.

The parameters of the optical lens 100 of the present embodiment 1 in the wide-angle state, the 10cm macro state, and the 3cm macro state are shown in tables 1 to 3.

Tables 1 to 3

As shown in tables 1-3, when the focal object distance of the optical lens is infinity (i.e., the wide-angle state, H1 is infinity), at this time, H2 is 0.983mm, and H3 is 0.240mm, corresponding to the optical structure of the optical lens in the wide-angle state. When the focusing distance of the optical lens is 10cm (i.e. 10cm micro-distance state, H1 is 100 mm), H2 is 0.925mm, and H3 is 0.298mm, corresponding to the optical structure of the optical lens in 10cm micro-distance state. When the focusing distance of the optical lens is 3cm (i.e. 3cm micro-distance state, H1 is 30 mm), H2 is 0.796mm, and H3 is 0.426mm, corresponding to the optical structure of the optical lens in 3cm micro-distance state.

Fig. 2 is an axial aberration diagram of the optical lens 100 in the wide-angle state in the present embodiment, which shows aberrations of each wavelength on the optical axis at the imaging plane, the horizontal axis shows the axial aberration value (unit: mm), and the vertical axis shows the normalized pupil radius. As can be seen from the figure, the axial aberration is controlled to be within ±0.03mm, which means that the optical lens 100 can correct the axial aberration well.

Fig. 3 is a graph of chromatic aberration of magnification of the optical lens 100 in the wide-angle state in this embodiment, which shows chromatic aberration at different image heights on the imaging plane for each wavelength with respect to the center wavelength (0.55 μm), the horizontal axis shows the chromatic aberration of magnification (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis shows the normalized angle of view. As can be seen from the figure, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5μm, indicating that the optical lens 100 can correct chromatic aberration well.

Fig. 4 is an axial aberration diagram of the optical lens 100 in the 10cm macro state in this embodiment, which shows the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis shows the axial aberration value (unit: mm), and the vertical axis shows the normalized pupil radius. As can be seen from the figure, the axial aberration is controlled to be within ±0.02mm, which means that the optical lens 100 can correct the axial aberration well.

Fig. 5 is a graph of chromatic aberration of magnification of the optical lens 100 at a micro distance of 10cm in this embodiment, which shows chromatic aberration at different image heights on the imaging surface for each wavelength with respect to the center wavelength (0.55 μm), the horizontal axis shows chromatic aberration of magnification (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis shows normalized angle of view. As can be seen from the figure, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5μm, indicating that the optical lens 100 can correct chromatic aberration well.

Fig. 6 is an axial aberration diagram of the optical lens 100 in the 3cm macro state in this embodiment, which shows the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis shows the axial aberration value (unit: mm), and the vertical axis shows the normalized pupil radius. As can be seen from the figure, the axial aberration is controlled to be within ±0.02mm, which means that the optical lens 100 can correct the axial aberration well.

Fig. 7 is a graph of chromatic aberration of magnification of the optical lens 100 in a 3cm macro state in this embodiment, which shows chromatic aberration at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing chromatic aberration of magnification (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized angle of view. As can be seen from the figure, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 100 can correct chromatic aberration well.

From the above figures, it can be seen that the aberrations of the optical lens in the wide-angle state and the macro state of embodiment 1 are well balanced, and have good optical imaging quality.

Example 2

Referring to fig. 8, a schematic diagram of an optical lens 200 in a wide-angle state according to embodiment 2 of the invention is shown, and the main difference between the present embodiment and embodiment 1 is that the object-side surface S1 of the first lens element L1 is convex, the image-side surface S2 of the first lens element L1 is concave, the image-side surface S10 of the fifth lens element L5 is concave at a paraxial region, and the optical parameters such as the radius of curvature and the lens thickness of each lens element surface are different.

The relevant parameters of each lens in the optical lens 200 in example 2 are shown in table 2-1.

TABLE 2-1

The surface profile parameters of the aspherical lens of the optical lens 200 in example 2 are shown in table 2-2.

TABLE 2-2

In table 2-1, H1 is an air gap between the first group Q1 and the object side on the optical axis, H2 is an air gap between the first group Q1 and the second group Q2 on the optical axis, and H3 is an air gap between the second group Q3 and the imaging plane on the optical axis.

Specifically, the first group Q1 is a fixed lens group and does not move when the optical lens focuses, and the second group Q2 is a focusing lens group, and micro-movement can be performed along the optical axis in the optical lens to complete the switching of the optical lens in a wide-angle state and a macro state. The second group Q2 moves from the image side to the object side along the optical axis with a focusing stroke of 0.057mm when the optical lens is switched from the wide-angle state at infinity to the macro state with an object distance of 10cm, and the second group Q2 moves from the image side to the object side with a focusing stroke of 0.197mm when the optical lens is switched from the wide-angle state at infinity to the macro state with an object distance of 3 cm.

The parameters of the optical lens 200 of this example 2 in the wide-angle state, the 10cm macro state, and the 3cm macro state are shown in tables 2 to 3.

Tables 2 to 3

As shown in tables 2-3, when the focal object distance of the optical lens is infinity (i.e., the wide-angle state, H1 is infinity), H2 is 1.645mm, and H3 is 0.241mm, corresponding to the optical structure of the optical lens in the wide-angle state. When the focusing distance of the optical lens is 10cm (i.e. 10cm micro-distance state, H1 is 100 mm), H2 is 1.588mm, and H3 is 0.299mm, corresponding to the optical structure of the optical lens in 10cm micro-distance state. When the focusing distance of the optical lens is 3cm (i.e. 3cm micro-distance state, H1 is 30 mm), H2 is 1.448mm, and H3 is 0.438mm, corresponding to the optical structure of the optical lens in 3cm micro-distance state.

Fig. 9 is an axial aberration diagram of the optical lens 200 in the wide-angle state in the present embodiment. As can be seen from the figure, the axial aberration is controlled within ±0.02mm, which means that the optical lens 200 can correct axial aberration well.

Fig. 10 is a graph showing a chromatic aberration of magnification of the optical lens 200 in the wide-angle state in the present embodiment. As can be seen from the figure, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3 μm, indicating that the optical lens 200 can correct chromatic aberration well.

Fig. 11 is an axial aberration diagram of the optical lens 200 in the 10cm macro state in the present embodiment. As can be seen from the figure, the axial aberration is controlled within ±0.02mm, which means that the optical lens 200 can correct axial aberration well.

Fig. 12 is a graph showing chromatic aberration of magnification of the optical lens 200 in a 10cm macro state in the present embodiment. As can be seen from the figure, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3 μm, indicating that the optical lens 200 can correct chromatic aberration well.

Fig. 13 is an axial aberration diagram of the optical lens 200 in the 3cm macro state in the present embodiment. As can be seen from the figure, the axial aberration is controlled within ±0.03mm, which means that the optical lens 200 can correct axial aberration well.

Fig. 14 is a graph showing chromatic aberration of magnification of the optical lens 200 in a 3cm macro state in the present embodiment. As can be seen from the figure, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 200 can correct chromatic aberration well.

From the above figures, it can be seen that the aberrations of the optical lens in the wide-angle state and the macro state of embodiment 2 are well balanced, and have good optical imaging quality.

Example 3

Referring to fig. 15, a schematic diagram of an optical lens 300 in a wide-angle state according to embodiment 3 of the present invention is shown, and the main difference between the present embodiment and embodiment 1 is that the object side surface S3 of the second lens L2 is concave at a paraxial region, and the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.

The relevant parameters of each lens in the optical lens 300 in example 3 are shown in table 3-1.

TABLE 3-1

The surface profile parameters of the aspherical lens of the optical lens 300 in example 3 are shown in table 3-2.

TABLE 3-2

In table 3-1, H1 is an air gap between the first group Q1 and the object side on the optical axis, H2 is an air gap between the first group Q1 and the second group Q2 on the optical axis, and H3 is an air gap between the second group Q3 and the imaging plane on the optical axis.

Specifically, the first group Q1 is a fixed lens group and does not move when the optical lens focuses, and the second group Q2 is a focusing lens group, and micro-movement can be performed along the optical axis in the optical lens to complete the switching of the optical lens in a wide-angle state and a macro state. The second group Q2 moves from the image side to the object side along the optical axis and the focusing stroke is 0.057mm when the optical lens is switched from the wide-angle state at infinity to the macro state at an object distance of 10cm, and the second group Q2 moves from the image side to the object side along the optical axis and the focusing stroke is 0.185mm when the optical lens is switched from the wide-angle state at infinity to the macro state at an object distance of 3 cm.

The parameters of the optical lens 300 of this example 3 in the wide-angle state, the 10cm macro state, and the 3cm macro state are shown in tables 3 to 3.

TABLE 3-3

As shown in tables 3-3, when the focal object distance of the optical lens is infinity (i.e., the wide-angle state, H1 is infinity), H2 is 0.500mm, and H3 is 0.234mm, corresponding to the optical structure of the optical lens in the wide-angle state. When the focusing distance of the optical lens is 10cm (i.e. 10cm micro-distance state, H1 is 100 mm), H2 is 0.443mm, and H3 is 0.290mm, corresponding to the optical structure of the optical lens in 10cm micro-distance state. When the focusing distance of the optical lens is 3cm (i.e. 3cm micro-distance state, H1 is 30 mm), H2 is 0.315mm, and H3 is 0.419mm, corresponding to the optical structure of the optical lens in 3cm micro-distance state.

Fig. 16 is an axial aberration diagram of the optical lens 300 in the wide-angle state in the present embodiment. As can be seen from the figure, the axial aberration is controlled within ±0.02mm, which means that the optical lens 300 can correct axial aberration well.

Fig. 17 is a graph showing a chromatic aberration of magnification of the optical lens 300 in the wide-angle state in the present embodiment. As can be seen from the figure, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5μm, indicating that the optical lens 300 can correct chromatic aberration well.

Fig. 18 is an axial aberration diagram of the optical lens 300 in the 10cm macro state in the present embodiment. As can be seen from the figure, the axial aberration is controlled to be within ±0.03mm, which means that the optical lens 300 can correct the axial aberration well.

Fig. 19 is a graph showing chromatic aberration of magnification of the optical lens 300 in a 10cm macro state in the present embodiment. As can be seen from the figure, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 300 can correct chromatic aberration well.

Fig. 20 is an axial aberration diagram of the optical lens 300 in the 3cm macro state in the present embodiment. As can be seen from the figure, the axial aberration is controlled to be within ±0.03mm, which means that the optical lens 300 can correct the axial aberration well.

Fig. 21 is a graph showing chromatic aberration of magnification of the optical lens 300 in a 3cm macro state in this embodiment. As can be seen from the figure, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 300 can correct chromatic aberration well.

From the above figures, it can be seen that the aberrations of the optical lens in the wide-angle state and the macro state of embodiment 3 are well balanced, and have good optical imaging quality.

Please refer to table 4, which is a numerical value corresponding to each parameter and conditional expression in the optical characteristics corresponding to each embodiment.

TABLE 4 Table 4

In summary, the optical lens provided by the present invention has the following advantages:

The optical lens provided by the invention can well realize continuous optical zooming, can realize optical continuous zooming from a wide-angle state to a micro-distance state by changing the air interval distance between different groups, can realize excellent compatible effects of wide-angle shooting and micro-distance shooting, has one or more advantages of miniaturization, wide-field imaging, high-quality imaging and the like, and greatly improves the experience effect of users.

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 invention. 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 foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. 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 invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. An optical lens consists of six lenses, and is characterized by comprising a first group with negative focal power and a second group with positive focal power in sequence from an object side to an imaging surface along an optical axis;

The second group is dynamically movable on the optical axis;

2. The optical lens of claim 1, wherein movement of the second group along the optical axis effects switching of the optical lens in a wide-angle state and a macro state, wherein a movement of the second group along the optical axis is less than 0.08mm when the optical lens is switched from a wide-angle state at infinity to a macro state at an object distance of 10cm, and wherein a movement of the second group along the optical axis is less than 0.25mm when the optical lens is switched from a wide-angle state at infinity to a macro state at an object distance of 3 cm.

3. The optical lens of claim 1, wherein the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy-20 < f1/f < -3.

4. The optical lens of claim 1, wherein a focal length f2 of the second lens and a focal length fb of the second group satisfy 0.8< f2/fb <1.5.

5. The optical lens of claim 1, wherein the focal length f3 of the third lens and the focal length fb of the second group satisfy-1.8 < f3/fb < -1.

6. The optical lens of claim 1, wherein a focal length f4 of the fourth lens and a focal length fb of the second group satisfy 0.5< f4/fb <1.5.

7. The optical lens of claim 1, wherein a focal length f5 of the fifth lens and a focal length fb of the second group satisfy-4 < f5/fb < -1.

8. The optical lens of claim 1, wherein a focal length f6 of the sixth lens and a focal length fb of the second group satisfy 2< f6/fb <12.

9. The optical lens of claim 1, wherein the object-side effective aperture DM11 of the first lens and the object-side effective aperture DM21 of the second lens satisfy 1.8< DM11/DM21<2.8, and the object-side effective aperture DM21 of the second lens and the image-side effective aperture DM62 of the sixth lens satisfy 0.3< DM21/DM62<0.6.

10. The optical lens of claim 1, wherein the total optical length TTL of the optical lens and the back focal length BFL of the optical lens satisfy 4.5< TTL/BFL <8, and the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy 1.8< TTL/f <2.8.

11. The optical lens system of claim 1, wherein the second lens element has a convex image-side surface, the third lens element has a convex object-side surface, the third lens element has a concave image-side surface, the fourth lens element has a convex object-side surface, the fourth lens element has a convex image-side surface, the fifth lens element has a concave object-side surface, the sixth lens element has a convex object-side surface in a paraxial region and the sixth lens element has a concave image-side surface in a paraxial region.