CN118393696B

CN118393696B - Optical lens

Info

Publication number: CN118393696B
Application number: CN202410827418.3A
Authority: CN
Inventors: 谢雨辰; 周熠辰; 章彬炜
Original assignee: Jiangxi Lianyi Optics Co Ltd
Current assignee: Jiangxi Lianyi Optics Co Ltd
Priority date: 2024-06-25
Filing date: 2024-06-25
Publication date: 2024-11-19
Anticipated expiration: 2044-06-25
Also published as: CN118393696A

Abstract

The invention provides an optical lens, which sequentially comprises from an object side to an imaging surface along an optical axis: a first lens having positive optical power, both the object-side surface and the image-side surface of which are convex; a second lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region; a third lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; a fourth lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; a fifth lens element with positive refractive power having a convex object-side surface at a paraxial region and a convex image-side surface; the object side surface of the sixth lens is concave at a paraxial region, and the image side surface of the sixth lens is concave at a paraxial region. The optical lens provided by the invention has one or more advantages of large target surface, large aperture, good imaging quality and the like through specific surface shape collocation and reasonable focal power distribution.

Description

Optical lens

Technical Field

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

Background

In recent years, with the rapid development of the internet and communication technology, portable electronic devices have also been increasingly sought after by consumers. With the popularization of smart phones, the mobile phone industry is vigorously developed, various demands of the masses on the mobile phones are continuously improved, and the photographing function of the mobile phones becomes an important factor for people to purchase the mobile phones. Therefore, mobile phone manufacturers have put more demands on lens groups mounted on mobile phones. Meanwhile, as the performance of the image sensor is improved and the size of the image sensor is reduced, the degree of freedom of the design of the corresponding lens is smaller and smaller, and the design difficulty is increased. Therefore, how to make the mobile phone have a large aperture characteristic while satisfying the requirement of high imaging quality and make the optical system satisfy the requirement of miniaturization is a current urgent problem to be solved.

Disclosure of Invention

In view of the foregoing, it is an object of the present invention to provide an optical lens having one or more advantages of a large target surface, a large aperture, excellent imaging quality, and the like.

The invention adopts the technical scheme that:

an optical lens comprising six lenses, in order from an object side to an imaging plane along an optical axis, comprising:

a first lens having positive optical power, both the object-side surface and the image-side surface of which are convex;

A second lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface;

a third lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

A fourth lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

a fifth lens element with positive refractive power having a convex object-side surface at a paraxial region and a convex image-side surface;

a sixth lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

wherein, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -1.0< f3/f4< -0.2.

Further preferably, the real image height IH corresponding to the maximum field angle of the optical lens and the aperture value Fno of the optical lens satisfy: 5mm < IH/FNo <6mm.

Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.5< f1/f <0.7; the object-side curvature radius R1 of the first lens and the image-side curvature radius R2 of the first lens satisfy: -0.5< R1/R2< -0.1.

Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -1.0< f2/f < -0.5.

Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 6.0< f3/f <15.0.

Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -25.0< f4/f < -10.0.

Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.8< f5/f <1.2; the object-side curvature radius R9 of the fifth lens and the image-side curvature radius R10 of the fifth lens satisfy: -100.0< R9/R10< -10.0.

Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.0< f6/f < -0.65; the object-side curvature radius R11 of the sixth lens and the image-side curvature radius R12 of the sixth lens satisfy: -0.8< R11/R12< -0.3.

Further preferably, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -1.0< f1/f2< -0.6.

Further preferably, a distance CT56 between the fifth lens and the sixth lens on the optical axis and a center thickness CT6 of the sixth lens satisfy: 2.0< CT56/CT6<4.0; the distance CT56 between the fifth lens and the sixth lens on the optical axis and the center thickness CT5 of the fifth lens satisfy: 2.0< CT56/CT5<3.0.

Further preferably, a focal length f5 of the fifth lens and a focal length f6 of the sixth lens satisfy: -1.5< f5/f6< -1.0; the effective focal length f of the optical lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy: 3.0< f56/f <20.0.

Compared with the prior art, the optical lens provided by the invention has the advantages that the lens has small volume through specific surface shape arrangement and reasonable focal power distribution; the large image surface characteristic of the lens can be realized, and the chip with larger size can be mounted, so that the high-definition imaging of the lens can be realized. In addition, the optical lens has a compact large aperture structure, so that more luminous flux can enter the optical lens, and the system can be imaged clearly in a dim environment; meanwhile, the integral aberration of the optical lens can be reasonably corrected, so that the optical lens has high pixels, and the imaging quality of the optical lens is improved.

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 structural diagram of an optical lens in embodiment 1 of the present invention.

Fig. 2 is a graph showing a field curvature of an optical lens in embodiment 1 of the present invention.

FIG. 3 is a graph showing F-Tanθ distortion of an optical lens in example 1 of the present invention.

Fig. 4 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 1 of the present invention.

Fig. 5 is a schematic structural diagram of an optical lens in embodiment 2 of the present invention.

Fig. 6 is a graph showing a field curvature of an optical lens in embodiment 2 of the present invention.

FIG. 7 is a graph showing F-Tanθ distortion of an optical lens in example 2 of the present invention.

Fig. 8 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 2 of the present invention.

Fig. 9 is a schematic structural diagram of an optical lens in embodiment 3 of the present invention.

Fig. 10 is a graph showing a field curvature of an optical lens in embodiment 3 of the present invention.

FIG. 11 is a graph showing F-Tanθ distortion of an optical lens in example 3 of the present invention.

Fig. 12 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 3 of the present invention.

Fig. 13 is a schematic structural diagram of an optical lens in embodiment 4 of the present invention.

Fig. 14 is a graph showing the field curvature of an optical lens in embodiment 4 of the present invention.

FIG. 15 is a graph showing F-Tanθ distortion of an optical lens in example 4 of the present invention.

Fig. 16 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 4 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, then 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.

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 consists of six lenses, and the six lenses are a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from an object side to an imaging surface along an optical axis.

In some embodiments, the first lens may have positive optical power with both the object-side and image-side surfaces being convex. The second lens element may have negative refractive power, wherein an object-side surface thereof is concave at a paraxial region thereof and an image-side surface thereof is concave. The third lens element may have positive refractive power, wherein an object-side surface thereof is convex at a paraxial region and an image-side surface thereof is concave at a paraxial region. The fourth lens element may have negative refractive power, wherein an object-side surface thereof is convex at a paraxial region and an image-side surface thereof is concave at a paraxial region. The fifth lens element may have positive refractive power, wherein an object-side surface thereof is convex at a paraxial region thereof and an image-side surface thereof is convex. The sixth lens element may have negative refractive power, wherein an object-side surface thereof is concave at a paraxial region thereof and an image-side surface thereof is concave at a paraxial region thereof.

In some embodiments, the optical lens may further include a diaphragm, and the diaphragm may be located between the object side and the first lens. It will be appreciated that the aperture is used to limit the amount of light entering to vary the brightness of the image.

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 f3 of the third lens and the focal length f4 of the fourth lens satisfy: -1.0< f3/f4< -0.2. The optical lens meets the conditions, is favorable for smooth transition of light, corrects various aberrations of the optical lens, and improves imaging quality of the optical lens.

In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the aperture value Fno of the optical lens satisfy: 5mm < IH/FNo <6mm. The method meets the conditions, is beneficial to improving the light flux of the system, and simultaneously realizes the large target surface imaging of the lens and the characteristics of large target surface and large aperture.

In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.5< f1/f <0.7; the object-side curvature radius R1 of the first lens and the image-side curvature radius R2 of the first lens satisfy: -0.5< R1/R2< -0.1. The first lens element with high positive refractive power can be miniaturized, spherical aberration of the system can be corrected, and imaging quality of the lens element can be improved.

In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -1.0< f2/f < -0.5. The object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy: R3/R4< -1.0. The conditions are met, the second lens bears larger negative refractive power, the deflection trend of light rays is facilitated to be quickened, the difficulty of distortion correction of the edge view field is reduced, the lens is ensured to have smaller distortion while realizing a large view angle, and the overall imaging quality is improved.

In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 6.0< f3/f <15.0. The object-side radius of curvature R5 of the third lens and the image-side radius of curvature R6 of the third lens satisfy: 0.5< R5/R6<1.0. The above conditions are satisfied, and the focal length and the surface shape of the third lens are reasonably set, so that the light trend is stable, the aberration brought by the front lens is balanced, and the imaging resolution is improved.

In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -25.0< f4/f < -10.0. The object-side surface curvature radius R7 of the fourth lens element and the image-side surface curvature radius R8 of the fourth lens element satisfy the following conditions: 1.0< R7/R8<1.5. The above conditions are satisfied, which is favorable for controlling the incidence angle of off-axis field light on the imaging surface, increasing the incidence angle of the chief ray entering the photosensitive chip, and better realizing the matching with the large CRA chip.

In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.8< f5/f <1.2; the object-side curvature radius R9 of the fifth lens and the image-side curvature radius R10 of the fifth lens satisfy: -100.0< R9/R10< -10.0. The lens meets the conditions, is favorable for further convergence of light, and ensures that the divergent light smoothly enters the rear optical system, thereby better realizing high-quality imaging of the lens.

In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.0< f6/f < -0.65; the object-side radius of curvature R11 of the sixth lens and the image-side radius of curvature R12 of the sixth lens satisfy: -0.8< R11/R12< -0.3. The requirements are met, the focal length and the surface shape of the sixth lens are reasonably adjusted, the divergence degree of light rays is increased, the area of the light rays entering the imaging surface is increased, the imaging of the large target surface of the lens is realized, and the imaging quality of the optical lens is improved.

In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -1.0< f1/f2< -0.6. The conditions are met, and the focal length relation of the first two lenses in the lens is reasonably set, so that the light quantity of the system is increased while the most light rays enter the system, and the balance of the wide view angle and the large aperture of the lens is realized.

In some embodiments, the distance CT56 between the fifth lens and the sixth lens on the optical axis and the center thickness CT6 of the sixth lens satisfy: 2.0< CT56/CT6<4.0; the distance CT56 between the fifth lens element and the sixth lens element on the optical axis and the center thickness CT5 of the fifth lens element satisfy the following conditions: 2.0< CT56/CT5<3.0. The lens has the advantages that the conditions are met, a larger air space is formed between the fifth lens and the sixth lens, the turning degree of light rays is reduced, the correction difficulty of edge aberration is reduced, and high-definition imaging of the lens is realized.

In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -1.5< f5/f6< -1.0; the effective focal length f of the optical lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy: 3.0< f56/f <20.0. The focal length relation of the last two lenses in the lens is reasonably set, so that the incidence angle of the chief ray can be effectively increased, further divergence of the chief ray is facilitated, large target surface imaging of the lens is realized, and high-definition imaging can be realized by matching with a large CRA (computer aided design).

In some embodiments, the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.1< TTL/f <1.3. 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 effective focal length f of the optical lens satisfy: 1.8< IH/f <2.2. The wide-angle characteristic can be realized by meeting the conditions, so that the requirement of large wide-angle shooting is met, the characteristic of large image plane can be realized, and the imaging quality of the lens is improved.

In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the chief ray incident angle CRA at the maximum image height of the optical lens satisfy: 0.28mm/° < IH/CRA <0.35mm/°. The matching performance of the lens and the large CRA high-pixel chip can be improved on the one hand, the allowable error value between the CRA of the optical lens and the CRA of the chip photosensitive element can be larger on the other hand, and the adaptation capability of the optical lens to the image sensor can be improved.

In some embodiments, the effective focal length f of the optical lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0.9< f45/f <1.2. The above conditions are satisfied, and the combination focal length ratio of the fourth lens and the fifth lens is reasonably set, so that the improvement of the angle of the ghost light rays between the fourth lens and the fifth lens and the reduction of the ghost energy are facilitated.

In some embodiments, the optical lens satisfies the conditional expression: fno <1.9; fno denotes an aperture value of the optical lens. The condition is satisfied, the large aperture characteristic is realized, and more incident light rays are provided for the optical lens.

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 as to reduce the number of lenses and reduce the size of the lenses, and better achieve miniaturization of the lens. 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, I, J is the fourth-order, sixth-order, eighth-order, tenth-order, fourteen-order, sixteen-order, eighteen-order and twenty-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 structural diagram of an optical lens 100 provided in embodiment 1 of the present invention is shown, where the optical lens sequentially includes, from an object side to an imaging plane along an optical axis: stop ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, and filter G1.

The first lens element L1 has positive refractive power, and an object-side surface S1 and an image-side surface S2 thereof are both convex;

The second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is concave at a paraxial region thereof and an image-side surface S4 thereof is concave;

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

The fourth lens element L4 has negative refractive power, wherein an object-side surface S7 thereof is convex at a paraxial region thereof and an image-side surface S8 thereof is concave at the paraxial region thereof;

The fifth lens element L5 has positive refractive power, wherein an object-side surface S9 thereof is convex at a paraxial region thereof and an image-side surface S10 thereof is convex;

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

The object side surface S13 and the image side surface S14 of the optical filter G1 are planes;

The imaging surface S15 is a plane.

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.

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 the present embodiment, the field curvature curve, the F-Tan θ distortion curve, and the vertical axis chromatic aberration curve of the optical lens 100 are shown in fig. 2, 3, and 4, respectively.

Fig. 2 shows a field curve of example 1, which indicates the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis indicates the amount of shift (unit: mm), and the vertical axis indicates the angle of view (unit: °). As can be seen from the figure, the curvature of field of the meridional image plane and the sagittal image plane is controlled within ±0.2mm, which means that the optical lens 100 can correct curvature of field well.

Fig. 3 shows an F-Tan θ distortion curve of example 1, which represents F-Tan θ distortion at different image heights on an imaging plane, the horizontal axis represents F-Tan θ distortion values (unit:%) and the vertical axis represents field angle (unit: °). As can be seen from the figure, the F-Tan θ distortion of the optical lens 100 is controlled within ±2%, indicating that the distortion of the optical lens 100 is well corrected.

Fig. 4 shows a vertical axis color difference graph of example 1, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.555 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a field angle. As can be seen from the figure, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 100 can excellently correct chromatic aberration of each field of view.

Example 2

Referring to fig. 5, a schematic structural diagram of an optical lens 200 provided in embodiment 2 of the present invention is shown, and the main difference between the present embodiment and embodiment 1 is that: the optical parameters such as the radius of curvature and the lens thickness are different for each lens surface.

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 the present embodiment, the field curvature curve, the F-Tan θ distortion curve, and the vertical axis chromatic aberration curve of the optical lens 200 are shown in fig. 6, 7, and 8, respectively.

As can be seen from fig. 6, the curvature of field of the meridional image plane and the sagittal image plane is controlled within ±0.3mm, which means that the optical lens 200 can correct curvature of field well.

As can be seen from fig. 7, the F-Tan θ distortion of the optical lens 200 is controlled within ±2%, indicating that the distortion of the optical lens 200 is well corrected.

As can be seen from fig. 8, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 200 can excellently correct chromatic aberration of each field of view.

Example 3

Referring to fig. 9, a schematic diagram of an optical lens 300 according to embodiment 3 of the present invention is shown, and the main difference between the present embodiment and embodiment 1 is that: the optical parameters such as the radius of curvature and the lens thickness are different for each lens surface.

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 the present embodiment, the field curvature curve, the F-Tan θ distortion curve, and the vertical axis chromatic aberration curve of the optical lens 300 are shown in fig. 10, 11, and 12, respectively.

As can be seen from fig. 10, the curvature of field of the meridional image plane and the sagittal image plane is controlled within ±0.2mm, which means that the optical lens 300 can correct curvature of field well.

As can be seen from fig. 11, the F-Tan θ distortion of the optical lens 300 is controlled within ±2%, indicating that the distortion of the optical lens 300 is well corrected.

As can be seen from fig. 12, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 300 can excellently correct chromatic aberration of each field of view.

Example 4

Referring to fig. 13, a schematic structural diagram of an optical lens 400 provided in embodiment 4 of the present invention is shown, and the main difference between the present embodiment and embodiment 1 is that: the optical parameters such as the radius of curvature and the lens thickness are different for each lens surface.

The relevant parameters of each lens in the optical lens 400 in example 4 are shown in table 4-1.

TABLE 4-1

The surface profile parameters of the aspherical lens of the optical lens in example 4 are shown in table 4-2.

TABLE 4-2

In the present embodiment, the field curvature curve, the F-Tan θ distortion curve, and the vertical axis chromatic aberration curve of the optical lens 400 are shown in fig. 14, 15, and 16, respectively.

As can be seen from fig. 14, the curvature of field of the meridional image plane and the sagittal image plane is controlled within ±0.3mm, which means that the optical lens 400 can correct curvature of field well.

As can be seen from fig. 15, the F-Tan θ distortion of the optical lens 400 is controlled within ±2%, indicating that the distortion of the optical lens 400 is well corrected.

As can be seen from fig. 16, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 400 can excellently correct chromatic aberration of each field of view.

Referring to table 5, the optical characteristics corresponding to the above embodiments include the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field angle, the chief ray incident angle CRA at the maximum image height, the maximum field angle FOV, and the numerical values corresponding to each condition in each embodiment.

TABLE 5

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

(1) The lens can effectively limit the length of the lens through specific surface shape arrangement and reasonable focal power distribution, and is beneficial to realizing the miniaturization of the optical lens; the large image surface characteristic of the lens can be realized, and the chip with larger size can be mounted, so that the high-definition imaging of the lens can be realized.

(2) The system has a compact large aperture structure, so that more luminous flux can enter the optical lens, and the system can image clearly in a dim environment; meanwhile, the integral aberration of the optical lens can be reasonably corrected, so that the optical lens has high pixels, a 64M high-pixel chip can be matched, and the imaging quality of the optical lens is 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 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 comprising six lenses, comprising, in order from an object side to an imaging plane along an optical axis:

Wherein, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -1.0< f3/f4< -0.2; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy the following conditions: -1.0< f2/f < -0.5.

2. The optical lens according to claim 1, wherein the real image height IH corresponding to the maximum field angle of the optical lens and the aperture value Fno of the optical lens satisfy: 5mm < IH/FNo <6mm.

3. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f1 of the first lens satisfy: 0.5< f1/f <0.7; the object-side curvature radius R1 of the first lens and the image-side curvature radius R2 of the first lens satisfy: -0.5< R1/R2< -0.1.

4. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f3 of the third lens satisfy: 6.0< f3/f <15.0.

5. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f4 of the fourth lens satisfy: -25.0< f4/f < -10.0.

6. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f5 of the fifth lens satisfy: 0.8< f5/f <1.2; the object-side curvature radius R9 of the fifth lens and the image-side curvature radius R10 of the fifth lens satisfy: -100.0< R9/R10< -10.0.

7. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f6 of the sixth lens satisfy: -1.0< f6/f < -0.65; the object-side curvature radius R11 of the sixth lens and the image-side curvature radius R12 of the sixth lens satisfy: -0.8< R11/R12< -0.3.

8. The optical lens of claim 1, wherein a focal length f1 of the first lens and a focal length f2 of the second lens satisfy: -1.0< f1/f2< -0.6.

9. The optical lens as claimed in claim 1, wherein a distance CT56 between the fifth lens and the sixth lens on the optical axis and a center thickness CT6 of the sixth lens satisfy: 2.0< CT56/CT6<4.0; the distance CT56 between the fifth lens and the sixth lens on the optical axis and the center thickness CT5 of the fifth lens satisfy: 2.0< CT56/CT5<3.0.

10. The optical lens of claim 1, wherein a focal length f5 of the fifth lens and a focal length f6 of the sixth lens satisfy: -1.5< f5/f6< -1.0; the effective focal length f of the optical lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy: 3.0< f56/f <20.0.