CN119846818B

CN119846818B - Optical lens

Info

Publication number: CN119846818B
Application number: CN202510322012.4A
Authority: CN
Inventors: 刘博�; 章彬炜; 郑航鹏
Original assignee: Jiangxi Lianyi Optics Co Ltd
Current assignee: Jiangxi Lianyi Optics Co Ltd
Priority date: 2025-03-19
Filing date: 2025-03-19
Publication date: 2025-09-02
Anticipated expiration: 2045-03-19
Also published as: CN119846818A

Abstract

The invention provides an optical lens, which sequentially comprises a first lens with positive focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with negative focal power and a fourth lens with positive focal power, wherein 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; the optical lens system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a seventh lens, an effective focal length f of the optical lens and a real image height IH, wherein the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, the object side surface of the first lens is a negative focal power, the object side surface of the third lens is a negative focal power, the object side surface of the fourth lens is a convex surface at a paraxial region, the image side surface of the fourth lens is a concave surface at a paraxial region, the fifth lens is a positive focal power, the image side surface of the sixth lens is a convex surface, the image side surface of the seventh lens is a concave surface at a paraxial region, and the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy 1.3< IH/f <1.6. The optical lens provided by the invention can improve the imaging quality of the optical lens through specific surface shape collocation and reasonable focal power distribution, and has the advantage of excellent imaging quality.

Description

Optical lens

Technical Field

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

Background

With the popularization of tele-office and online education, video conferences become an integral part of people's daily life and work, and the quality of video conferences depends largely on the optical lens of video conferences, which puts higher demands on video conference lenses. Video conference lenses are often required to provide high resolution, such as 1080p or 4K, for example, to provide clear video quality, and are often required to better blur the background and highlight the participant's body, for example, to effectively capture the participant in the conference room, and to provide good video quality in a darker environment, are often required to have a larger aperture. The conventional video conference lens has some limitations, such as low resolution, poor imaging effect in low light or dim environment, etc., so that it is highly desirable to provide an optical lens that can meet the use requirements of the video conference.

Disclosure of Invention

In view of the foregoing, an object of the present invention is to provide an optical lens having an advantage of excellent imaging quality.

The invention provides an optical lens, seven lenses altogether, including in order from the object side to the imaging plane along the optical axis:

the first lens with positive focal power has a convex object side surface and a concave image side surface;

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

A third lens having negative optical power;

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 having positive optical power, an image side surface of which is convex;

a sixth lens having negative optical power;

A seventh lens having negative optical power, an image-side surface of which is concave at a paraxial region;

The real image height IH corresponding to the effective focal length f of the optical lens and the maximum field angle of the optical lens is 1.3< IH/f <1.6.

Further preferably, 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 is 0.8< TTL/IH <0.92.

Further preferably, a combined focal length f14 of the first lens, the second lens, the third lens and the fourth lens and an effective focal length f of the optical lens satisfy 1.2< f14/f <1.6.

Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens meet 0.85< f1/f <1.05, and the effective focal length f of the optical lens and the focal length f2 of the second lens meet-4.5 < f2/f < -2.

Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy-25 < f3/f < -5.

Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens meet-28 < f4/f < -2 >, and the object-side curvature radius R7 of the fourth lens and the image-side curvature radius R8 of the fourth lens meet 1< R7/R8<1.7.

Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy 0.5< f5/f <0.85.

Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy-10 < f6/f < -1.8.

Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy-0.8 < f7/f < -0.5.

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 meet the condition that 6mm < IH/FNo <6.7mm.

Further preferably, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy-1.8 < f1/f7< -1 >, and the object-side light-transmitting aperture DM11 of the first lens and the image-side light-transmitting aperture DM72 of the seventh lens satisfy 0.37< DM11/DM72<0.47.

Compared with the prior art, the optical lens provided by the invention adopts seven lenses with specific focal power, and can improve the imaging quality of the optical lens, reduce the aberration and improve the imaging quality of the optical lens through specific surface shape collocation and reasonable focal power distribution, so that the lens has one or more advantages of long focus, large aperture, large image height, high pixel, high imaging quality and the like.

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

FIG. 3 is a graph of f-tan (θ) distortion of an optical lens in embodiment 1 of the present invention.

Fig. 4 is an axial aberration diagram of the optical lens in embodiment 1 of the present invention.

Fig. 5 is a vertical axis chromatic aberration diagram of an optical lens in embodiment 1 of the present invention.

Fig. 6 is a schematic structural diagram of an optical lens in embodiment 2 of the present invention.

Fig. 7 is an astigmatic curve diagram of an optical lens in embodiment 2 of the present invention.

FIG. 8 is a graph of f-tan (θ) distortion of an optical lens in embodiment 2 of the present invention.

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

Fig. 10 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 2 of the present invention.

Fig. 11 is a schematic structural diagram of an optical lens in embodiment 3 of the present invention.

Fig. 12 is an astigmatic diagram of an optical lens in embodiment 3 of the present invention.

FIG. 13 is a graph of f-tan (θ) distortion of an optical lens in example 3 of the present invention.

Fig. 14 is an axial aberration diagram of an optical lens in embodiment 3 of the present invention.

Fig. 15 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 3 of the present invention.

Fig. 16 is a schematic structural diagram of an optical lens in embodiment 4 of the present invention.

Fig. 17 is an astigmatic curve diagram of an optical lens in embodiment 4 of the present invention.

FIG. 18 is a graph of f-tan (θ) distortion of an optical lens in example 4 of the present invention.

Fig. 19 is an axial aberration diagram of the optical lens in embodiment 4 of the present invention.

Fig. 20 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 4 of the present invention.

Fig. 21 is a schematic structural diagram of an optical lens in embodiment 5 of the present invention.

Fig. 22 is an astigmatic curve diagram of an optical lens in embodiment 5 of the present invention.

FIG. 23 is a graph showing f-tan (θ) distortion of an optical lens in example 5 of the present invention.

Fig. 24 is an axial aberration diagram of the optical lens in embodiment 5 of the present invention.

Fig. 25 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 5 of the present invention.

Fig. 26 is a schematic structural diagram of an optical lens in embodiment 6 of the present invention.

Fig. 27 is an astigmatic diagram of an optical lens in embodiment 6 of the present invention.

FIG. 28 is a graph of f-tan (θ) distortion of an optical lens in example 6 of the present invention.

Fig. 29 is an axial aberration diagram of the optical lens in embodiment 6 of the present invention.

Fig. 30 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 6 of the present invention.

Fig. 31 is a schematic diagram of an optical lens in embodiment 7 of the present invention.

Fig. 32 is an astigmatic curve diagram of an optical lens in embodiment 7 of the present invention.

FIG. 33 is a graph of f-tan (θ) distortion of an optical lens in example 7 of the present invention.

Fig. 34 is an axial aberration diagram of the optical lens in embodiment 7 of the present invention.

Fig. 35 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 7 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 comprises seven lenses in total, wherein the optical lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an imaging surface along an optical axis.

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

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 seventh lens 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 effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy 1.3< IH/f <1.6. The lens has larger image surface and long focal length performance, and can be matched with a chip with larger size to realize high-definition imaging.

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 0.8< TTL/IH <0.92. The lens can be miniaturized well under the condition that the lens is miniaturized, and the imaging chip with a larger size can be matched to realize high-definition imaging under the condition that the same total length of the lens is ensured.

In some embodiments, the combined focal length f14 of the first, second, third, and fourth lenses and the effective focal length f of the optical lens satisfy 1.2< f14/f <1.6. The light converging device meets the conditions, is favorable for converging light, enables the light entering the system from the front end to smoothly enter the rear optical system, enables the trend of the whole light path to be more gentle, optimizes aberration, and improves imaging resolution.

In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy 0.85< f1/f <1.05, and the object-side radius of curvature R1 of the first lens and the image-side radius of curvature R2 of the first lens satisfy 0.08< R1/R2<0.28. The first lens has larger positive refractive power, improves the light collecting capacity of the edge view field, reduces the working caliber of the first lens, and is beneficial to realizing the balance of a large aperture and a small aperture.

In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy-4.5 < f2/f < -2 >, and the object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy 1.2< R3/R4<1.7. The lens has the advantages that the focal length and the surface shape of the second lens are reasonably set, incident light rays can be effectively diverged, light ray deflection overlarge caused by overlarge focal power of the first lens is avoided, and the correction difficulty of aberration is reduced.

In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy-25 < f3/f < -5. The optical lens has the advantages that the focal length of the third lens is reasonably set, smooth transition of light is facilitated, astigmatism and field curvature are conveniently corrected, and imaging quality of the optical lens is improved.

In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy-28 < f4/f < -2, and the object-side radius of curvature R7 of the fourth lens and the image-side radius of curvature R8 of the fourth lens satisfy 1< R7/R8<1.7. The light beam divergence of the central view field can be realized by reasonably setting the focal length and the surface shape of the fourth lens, and meanwhile, the exit angle of the light beam of the edge view field is reduced by combining the bending of the edge area of the fifth lens, so that the relative illumination of the edge view field is improved.

In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy 0.5< f5/f <0.85. The fifth lens has larger positive focal power, can effectively converge front-end incident light rays, is favorable for correcting aberration and distortion of an edge view field caused by the front-end lens group, enables the lens to have smaller distortion, and can provide a high-definition imaging effect.

In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy-10 < f6/f < -1.8. The light rays of the edge view field can be effectively diverged by reasonably setting the focal length of the sixth lens, and meanwhile, the emergence angle of the light rays of the edge view field is reduced by combining the bending of the edge area of the seventh lens, so that the relative illumination of the edge view field is improved.

In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy-0.8 < f7/f < -0.5. The seventh lens has larger negative focal power, so that incident light can be diverged to a larger extent, peripheral light and central light can be turned upwards to reach a higher imaging position, large target surface imaging of the lens is better realized, and imaging quality is improved.

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 meet 6mm < IH/FNo <6.7mm. The lens can better realize the balance of large target surface imaging and large aperture performance, can enable the pixel distribution to be sparse (namely the pixel spot size is larger), can reduce noise spots in a darker environment, has wider dynamic range and can keep more details in a dark part, thereby improving the picture quality.

In some embodiments, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy-1.8 < f1/f7< -1 >, and the object-side light-passing aperture DM11 of the first lens and the image-side light-passing aperture DM72 of the seventh lens satisfy 0.37< DM11/DM72<0.47. The lens has a smaller head size and a larger imaging surface by reasonably setting the ratio of the focal length and the caliber of the head lens and the tail lens, and can better meet the miniaturization and the high pixel balance.

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 image-side radius of curvature R10 of the fifth lens element and the effective focal length f of the optical lens element satisfy-1 < R10/f < -0.2. The lens meets the conditions, is favorable for better realizing the convergence of light rays, shortens the distance from the light rays to the next lens, and is favorable for reducing the total length of the optical lens.

In some embodiments, the image-side radius of curvature R14 of the seventh lens and the effective focal length f of the optical lens satisfy 0.2< R14/f <3.2. The angle of incidence of the edge view field on the imaging surface can be properly pressed, more light beams can be effectively transmitted to the imaging surface, and the relative illumination 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-0.4 < f1/f2< -0.2. The optical lens meets the conditions, and the focal lengths of the first lens and the second lens are reasonably distributed, so that the long focal length of the optical lens and the balance of high pixels are favorably realized, and the total length of the optical lens is favorably shortened.

In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy-0.3 < f5/f6< -0.05. 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 sum of the total optical length TTL of the optical lens and the center thicknesses of the first lens to the seventh lens along the optical axis respectively ΣCT satisfies that 0.55< ΣCT/TTL <0.7. The total length of the optical lens can be effectively compressed by meeting the conditions, and the structural design and the production process of the optical lens are facilitated.

In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy 2.4< IH/EPD <2.85. The width of the light beam entering the optical lens can be increased by meeting the conditions, so that the brightness of the optical lens at the image plane is improved, and the occurrence of dark angles is avoided.

In some embodiments, the effective focal length f of the optical lens, the maximum field angle FOV of the optical lens, and the real image height IH corresponding to the maximum field angle of the optical lens satisfy 0.96< (2 Xf tan (FOV/2))/IH <1.02. The above conditions are satisfied, so that the lens has a small distortion value (for example, the distortion value is less than 1%), the image deformation degree of the marginal view field is reduced, and a high-definition imaging effect can be provided.

In some embodiments, the combined focal length f13 of the first, second, and third lenses and the combined focal length f14 of the first, second, third, and fourth lenses satisfy 0.75< f13/f14<1.1. The focal length of the front three lenses is reasonably balanced to be beneficial to balancing various aberrations of the lens and improving the overall imaging quality.

In some embodiments, the optical lens satisfies a condition ：7.5mm<f<8.3mm,9.2mm<TTL<10.5mm,1.7<Fno<1.9,10.5mm<IH<12mm,68°<FOV<76°,, where f represents an effective focal length of the optical lens, TTL represents an optical total length of the optical lens, fno represents an aperture value of the optical lens, IH represents a real image height corresponding to a maximum field angle of the optical lens, and FOV represents the maximum field angle of the optical lens. The optical lens provided by the embodiment of the invention has at least the characteristics of smaller optical total length, larger imaging surface, larger aperture value, long focal length and short depth of field, can realize high-definition imaging in dark environment by matching with a chip with larger size, and can better blur the background and highlight the main body when shooting a long-distance scenery or person.

In some embodiments, seven lenses in the optical lens can all adopt plastic lenses or adopt glass-plastic mixed material collocation structures, preferably, the optical lens adopts seven-lens glass-plastic mixed collocation lens structures, so that the optical lens can better match with a large target surface chip to realize high-definition imaging, and meanwhile, the reasonable balance of miniaturization, large image surface and large wide angle of the optical lens can be realized. Specifically, the first lens is a glass lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all plastic lenses, and the glass-plastic mixed structure is adopted, so that the cost can be effectively reduced, the aberration can be corrected, the volume can be reduced, and an optical lens product with higher cost performance can be provided.

In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens may be spherical lenses or aspherical lenses, and compared with spherical structures, the aspherical structures can effectively reduce 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, in the optical lens provided by the invention, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens can adopt aspheric lenses.

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 structure of an optical lens 100 according to embodiment 1 of the present invention is shown, where the optical lens 100 includes, in order from an object side to an imaging surface S17 along an optical axis, a stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

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

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

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

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 with negative refractive power has a concave object-side surface S11 and a convex image-side surface S12;

The seventh lens L7 has negative focal power, wherein an object side S13 thereof is concave, and an image side S14 thereof is concave at a paraxial region;

The object side surface S15 and the image side surface S16 of the optical filter G1 are planes;

The imaging surface S17 is a plane.

The first lens L1 adopts a glass aspheric lens, and the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 adopt 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 astigmatic curve chart, the f-tan (θ) distortion curve chart, the axial aberration curve chart, and the vertical axis aberration curve chart of the optical lens 100 are shown in fig. 2,3,4, and 5, respectively.

Fig. 2 shows an astigmatic diagram of the optical lens 100 in this embodiment, which represents astigmatism of light rays on a meridional image plane and a sagittal image plane, with the horizontal axis representing an offset (unit: mm) and the vertical axis representing a field angle (unit: °). As can be seen from the figure, astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1mm, which means that the optical lens 100 can correct astigmatism well.

Fig. 3 shows a distortion graph of f to tan (θ) of the optical lens 100 in this embodiment, which represents distortion of different view angles on the imaging plane, the horizontal axis represents distortion values (unit:%) and the vertical axis represents view angles (unit: °). As can be seen from the figure, the distortion value is controlled within ±1%, which indicates that the optical lens 100 can correct distortion well.

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

Fig. 5 shows a graph of chromatic aberration on the vertical axis of the optical lens 100 in this embodiment, which shows chromatic aberration at different image heights on the imaging plane for each wavelength with respect to the center wavelength (0.555 μm), the horizontal axis shows the value of chromatic aberration on the vertical axis (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 μm, indicating that the optical lens 100 can correct chromatic aberration well.

Example 2

Referring to fig. 6, a schematic structural diagram of an optical lens 200 according to 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 of each lens 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 the present embodiment, the astigmatic curve chart, the f-tan (θ) distortion curve chart, the axial aberration curve chart, and the vertical axis aberration curve chart of the optical lens 200 are shown in fig. 7,8, 9, and 10, respectively. As can be seen from fig. 7, astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1mm, which indicates that the optical lens 200 can correct astigmatism well. As can be seen from fig. 8, the distortion value is controlled within ±1%, which means that the optical lens 200 can correct the distortion well. As can be seen from fig. 9, the shift amount of the axial aberration is controlled within ±0.02mm, indicating that the optical lens 200 can correct the axial aberration well. As can be seen from fig. 10, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 200 can correct chromatic aberration well.

Example 3

Referring to fig. 11, a schematic structural diagram of an optical lens 300 according to an embodiment 3 of the present invention is shown, and the main difference between the present embodiment and the embodiment 1 is that an object-side surface S5 of the third lens element L3 is convex at a paraxial region, an image-side surface S6 of the third lens element L3 is concave at a paraxial region, and optical parameters such as a radius of curvature and a lens thickness of each lens element 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 the present embodiment, the astigmatic curve chart, the f-tan (θ) distortion curve chart, the axial aberration curve chart, and the vertical axis aberration curve chart of the optical lens 300 are shown in fig. 12, 13, 14, and 15, respectively. As can be seen from fig. 12, astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1mm, which means that the optical lens 300 can correct astigmatism well. As can be seen from fig. 13, the distortion value is controlled within ±1%, which means that the optical lens 300 can correct the distortion well. As can be seen from fig. 14, the offset of the axial aberration is controlled within ±0.03mm, which means that the optical lens 300 can correct the axial aberration well. As can be seen from fig. 15, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 300 can correct chromatic aberration well.

Example 4

Referring to fig. 16, a schematic diagram of an optical lens 400 according to 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 thickness of the lens are different.

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 400 in example 4 are shown in table 4-2.

TABLE 4-2

In the present embodiment, the astigmatic curve chart, the f-tan (θ) distortion curve chart, the axial aberration curve chart, and the vertical axis aberration curve chart of the optical lens 400 are shown in fig. 17, 18, 19, and 20, respectively. As can be seen from fig. 17, astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1mm, which indicates that the optical lens 400 can correct astigmatism well. As can be seen from fig. 18, the distortion value is controlled within ±1%, which means that the optical lens 400 can correct the distortion well. As can be seen from fig. 19, the shift amount of the axial aberration is controlled within ±0.03mm, indicating that the optical lens 400 can correct the axial aberration well. As can be seen from fig. 20, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 400 can correct chromatic aberration well.

Example 5

Referring to fig. 21, a schematic structural diagram of an optical lens 500 according to an embodiment 5 of the present invention is shown, and the main difference between the present embodiment and the embodiment 1 is that the image side surface S6 of the third lens element L3 is concave at a paraxial region, the object side surface S13 of the seventh lens element L7 is convex, 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 500 in example 5 are shown in table 5-1.

TABLE 5-1

The surface profile parameters of the aspherical lens of the optical lens 500 in example 5 are shown in table 5-2.

TABLE 5-2

In the present embodiment, the astigmatic curve chart, the f-tan (θ) distortion curve chart, the axial aberration curve chart, and the vertical axis aberration curve chart of the optical lens 500 are shown in fig. 22, 23, 24, and 25, respectively. As can be seen from fig. 22, astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1mm, which means that the optical lens 500 can correct astigmatism well. As can be seen from fig. 23, the distortion value is controlled within ±1%, which means that the optical lens 500 can correct the distortion well. As can be seen from fig. 24, the offset of the axial aberration is controlled within ±0.03mm, which means that the optical lens 500 can correct the axial aberration well. As can be seen from fig. 25, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 500 can correct chromatic aberration well.

Example 6

Referring to fig. 26, a schematic structural diagram of an optical lens 600 according to an embodiment 6 of the present invention is shown, and the main difference between the present embodiment is that the image side surface S6 of the third lens element L3 is concave at a paraxial region, the object side surface S9 of the fifth lens element L5 is concave, the object side surface S13 of the seventh lens element L7 is convex, and the optical parameters such as the radius of curvature and the lens thickness of each lens element are different.

The relevant parameters of each lens in the optical lens 600 in example 6 are shown in table 6-1.

TABLE 6-1

The surface profile parameters of the aspherical lens of the optical lens 600 in example 6 are shown in table 6-2.

TABLE 6-2

In the present embodiment, the astigmatic curve chart, the f-tan (θ) distortion curve chart, the axial aberration curve chart, and the vertical axis aberration curve chart of the optical lens 600 are shown in fig. 27, 28, 29, and 30, respectively. As can be seen from fig. 27, astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1mm, which means that the optical lens 600 can correct astigmatism well. As can be seen from fig. 28, the distortion value is controlled within ±1%, which means that the optical lens 600 can correct the distortion well. As can be seen from fig. 29, the shift amount of the axial aberration is controlled within ±0.03mm, indicating that the optical lens 600 can correct the axial aberration well. As can be seen from fig. 30, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 600 can correct chromatic aberration well.

Example 7

Referring to fig. 31, a schematic diagram of an optical lens 700 according to embodiment 7 of the invention is shown, and the main difference between the present embodiment and embodiment 1 is that the object-side surface S11 of the sixth lens element L6 is convex at the paraxial region, the image-side surface S12 of the sixth lens element L6 is concave at the 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 700 in example 7 are shown in table 7-1.

TABLE 7-1

The surface profile parameters of the aspherical lens of the optical lens 700 in example 7 are shown in table 7-2.

TABLE 7-2

In the present embodiment, the astigmatic curve chart, the f-tan (θ) distortion curve chart, the axial aberration curve chart, and the vertical axis aberration curve chart of the optical lens 700 are shown in fig. 32, 33, 34, and 35, respectively. As can be seen from fig. 32, astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1mm, which means that the optical lens 700 can correct astigmatism well. As can be seen from fig. 33, the distortion value is controlled within ±1%, which means that the optical lens 700 can correct distortion well. As can be seen from fig. 34, the shift amount of the axial aberration is controlled within ±0.02mm, indicating that the optical lens 700 can correct the axial aberration well. As can be seen from fig. 35, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 700 can correct chromatic aberration well.

Referring to table 8, 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 8

In summary, the optical lens provided by the embodiment of the invention adopts a seven-piece glass-plastic mixed structure, and has the characteristics of compact structure, effectively shortened overall length, favorable miniaturization, larger aperture value, capability of realizing high-definition imaging in a darker environment, larger imaging surface, capability of realizing high-definition imaging by matching with a chip with larger size, long focus, short depth of field and better blurring background and protruding main body when shooting a long-distance scenery or person by means of specific surface shape arrangement and reasonable optical power distribution. In addition, the integral aberration of the optical lens can be reasonably corrected, the optical lens has the characteristics of small distortion and high pixels, 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 seven lenses, characterized in that, along the optical axis, from the object side to the imaging plane, it comprises:

The first lens has positive refractive power, its object-side surface is convex and its image-side surface is concave;

a second lens having negative optical power, the object-side surface of which is convex and the image-side surface of which is concave;

a third lens having negative optical power;

a fourth lens element having negative optical power, whose object-side surface is convex near the optical axis and whose image-side surface is concave near the optical axis;

a fifth lens element having positive refractive power and a convex image-side surface;

a sixth lens having negative optical power;

The seventh lens element has a negative optical power and its image-side surface is concave near the optical axis.

Among them, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 1.3<IH/f<1.6; the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -25<f3/f<-5; the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -28<f4/f<-2; the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.8<TTL/IH≤0.872.

2. The optical lens according to claim 1, wherein the combined focal length f14 of the first lens, the second lens, the third lens and the fourth lens satisfies the following relationship with the effective focal length f of the optical lens: 1.2<f14/f<1.6.

3. The optical lens according to claim 1, characterized in that the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy the following relationship: 0.85<f1/f<1.05; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy the following relationship: -4.5<f2/f<-2.

4. The optical lens according to claim 1, wherein the object side curvature radius R7 of the fourth lens element and the image side curvature radius R8 of the fourth lens element satisfy: 1<R7/R8<1.7.

5 . The optical lens according to claim 1 , wherein the effective focal length f of the optical lens and the focal length f5 of the fifth lens element satisfy the relationship: 0.5<f5/f<0.85.

6 . The optical lens according to claim 1 , wherein an effective focal length f of the optical lens and a focal length f6 of the sixth lens satisfy the relationship: −10<f6/f<−1.8.

7 . The optical lens according to claim 1 , wherein the effective focal length f of the optical lens and the focal length f7 of the seventh lens element satisfy the relationship: −0.8<f7/f<−0.5.

8. The optical lens according to claim 1, wherein a true image height IH corresponding to the maximum field angle of the optical lens and an aperture value Fno of the optical lens satisfy the following relationship: 6 mm < IH / Fno < 6.7 mm.

9. The optical lens according to claim 1, characterized in that the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: -1.8<f1/f7<-1; the object-side light-transmitting aperture DM11 of the first lens and the image-side light-transmitting aperture DM72 of the seventh lens satisfy: 0.37<DM11/DM72<0.47.