CN120405911B

CN120405911B - Optical lens

Info

Publication number: CN120405911B
Application number: CN202510883860.2A
Authority: CN
Inventors: 徐文; 杜人初; 章彬炜
Original assignee: Jiangxi Lianyi Optics Co Ltd
Current assignee: Jiangxi Lianyi Optics Co Ltd
Priority date: 2025-06-30
Filing date: 2025-06-30
Publication date: 2025-10-17
Anticipated expiration: 2045-06-30
Also published as: CN120405911A

Abstract

The present invention provides an optical lens having seven lenses, which include, in order from the object side to the imaging surface along the optical axis: a first lens having negative optical power, whose image side surface is concave; a second lens having negative optical power, whose object side surface is convex and whose image side surface is concave; a third lens having negative optical power, whose object side surface is convex and whose image side surface is concave; a fourth lens having positive optical power, whose object side surface is convex; a fifth lens having positive optical power, whose object side surface is convex; a sixth lens having positive optical power, whose object side surface is convex near the optical axis; a seventh lens having positive optical power, whose object side surface is convex and whose image side surface is convex. The optical lens provided by the present invention reduces aberrations and improves the imaging quality of the optical lens through specific surface shape matching and reasonable optical power distribution, so that the lens has one or more advantages such as ultra-wide angle, ultra-large aperture, large image surface, high pixel, and high imaging quality.

Description

Optical lens

Technical Field

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

Background

Along with the continuous improvement of the requirements of people on driving experience, the vehicle-mounted application optical lens is increasingly used in intelligent driving, and the position of the vehicle-mounted optical lens in the related industries of automobiles is continuously improved. In the field of vehicle driving, a conventional automobile data recorder lens cannot be compatible with various advantages such as a large aperture, a large wide angle, high pixels and the like.

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 ultra-wide angle, ultra-large aperture, high pixel, and the like.

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

a first lens having negative optical power, the image side surface of which is concave;

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

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;

a fourth lens with positive focal power, the object side surface of which is a convex surface;

A fifth lens with positive focal power, the object side surface of which is a convex surface;

a sixth lens element with positive optical power having an object-side surface convex at a paraxial region;

a seventh lens element with positive refractive power having a convex object-side surface and a convex image-side surface;

Wherein the maximum field angle FOV of the optical lens and the aperture value FNo of the optical lens satisfy 130 DEG < FOV/FNo <150 deg.

Further preferably, the optical total length TTL of the optical lens and the effective focal length f of the optical lens meet 6.2< TTL/f <7.5.

Further preferably, 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 55 ° < (f×fov)/IH <65 °.

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 2.6< TTL/IH <3.

Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy-2.7 < f1/f < -1.9.

Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy 2.4< f4/f <3.4.

Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy 1.3< f7/f <1.7.

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 8mm < IH/FNo <9.2mm.

Further preferably, the object side surface light-transmitting half-caliber sagittal height SAG51 of the fifth lens and the center thickness CT5 of the fifth lens meet the condition that 0.3< SAG51/CT5<0.38.

Further preferably, the distance CT34 between the third lens and the fourth lens, the distance CT45 between the fourth lens and the fifth lens, the distance CT56 between the fifth lens and the sixth lens, the distance CT67 between the sixth lens and the seventh lens and the total optical length TTL of the optical lens satisfy 0.01< (CT 34+ CT45+ CT56+ CT 67)/TTL <0.04.

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 ultra wide angle, ultra large aperture, large image surface, 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 a graph showing a field curvature of an optical lens in embodiment 1 of the present invention.

Fig. 3 is a graph showing f-theta distortion of the optical lens in example 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 a graph showing a field curvature of an optical lens in embodiment 2 of the present invention.

Fig. 8 is a graph showing f-theta distortion of an optical lens in example 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 a graph showing the field curvature of an optical lens in embodiment 3 of the present invention.

Fig. 13 is a graph showing f-theta 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.

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 negative optical power, the object-side surface thereof may be concave or convex, and the image-side surface thereof may be 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 is convex and an image-side surface thereof is concave. The fourth lens element may have positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof may be concave or convex. The fifth lens element may have positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof may be concave or convex. The sixth lens element has positive refractive power, wherein an object-side surface thereof is convex at a paraxial region thereof and an image-side surface thereof may be concave or convex. The seventh lens element may have positive refractive power, wherein an object-side surface thereof is convex and an image-side surface thereof is convex.

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 and a protective glass, and the optical filter and the protective glass may be disposed between the seventh lens and the imaging surface in order along the optical axis. 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. The protective glass plays a role in protecting the optical lens and prevents the photosensitive chip from being damaged to influence the imaging effect of the lens.

In some embodiments, the maximum field angle FOV of the optical lens and the aperture value FNo of the optical lens satisfy 130 < FOV/FNo < 150. The lens can achieve that the large visual angle is achieved when the luminous flux is improved through the large aperture, and the recording visual angle is wider.

In some embodiments, the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy 6.2< TTL/f <7.5. 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 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 55 ° < (f x FOV)/IH <65 °. The method meets the above conditional expression, and is favorable for realizing the balance of the large field angle and the large target surface imaging of the optical lens by reasonably limiting the relation of the focal length, the field angle and the image height of the optical lens, thereby better meeting the use requirement of wide-angle shooting of the automobile data recorder.

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 2.6< TTL/IH <3. 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 effective focal length f of the optical lens and the focal length f1 of the first lens satisfy-2.7 < f1/f < -1.9. The first lens has a proper negative focal length, which is beneficial to enlarging the angle of view of the optical lens.

In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy 2.4< f4/f <3.4. The optical lens has the advantages that the focal length of the fourth lens is reasonably set, smooth transition of light is facilitated, astigmatism and field curvature are conveniently corrected, imaging quality of the optical lens is improved, and stability of the optical system is guaranteed.

In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy 1.3< f7/f <1.7. The seventh lens adopts a short focal length, is favorable for light receiving, ensures the light quantity, improves the relative illuminance, and ensures that the brightness of the optical lens at the image plane 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 8mm < IH/FNo <9.2mm. The above conditions are met, the optical lens is ensured to have a larger aperture while the optical lens is maintained to have a large image plane, and the balance between the large image plane and the large aperture is realized.

In some embodiments, the object-side light passing half-caliber sagittal height SAG51 of the fifth lens and the center thickness CT5 of the fifth lens satisfy 0.3< SAG51/CT5<0.38. The ratio of the sagittal height to the thickness of the fifth lens is properly adjusted to be beneficial to lens manufacturing and molding, thereby improving the manufacturing yield and shortening the total length of the optical lens.

In some embodiments, the optical total length TTL of the optical lens and the third lens element CT34, the fourth lens element CT45, the fifth lens element CT56, the sixth lens element CT67, and the seventh lens element CT67 satisfies 0.01< (CT34+CT45+CT56+CT67)/TTL <0.04. The above conditions are satisfied, it is ensured that the intervals between the third, fourth, fifth, sixth and seventh lenses are not excessively large, thereby controlling the lens length, and on the basis of satisfying miniaturization of the optical lens, the energy level of the ghost reflected between lenses is reduced, and miniaturization and weak ghost are realized.

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 2.2< IH/f <2.6. The conditions are met, a larger field angle and an imaging range can be realized, and the large image plane characteristic can be realized while the depth of field of the optical lens is ensured, so that the imaging quality of the optical system is improved.

In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy-650 < f2/f < -24, and the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy-8.5 < f3/f < -4.5. The second lens and the third lens both adopt negative lenses, so that light rays can be further emitted, and the angle of view of the imaging system is improved.

In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy 1.8< f5/f <3, and the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy 5.5< f6/f <33. The fifth lens and the sixth lens both adopt positive focal power, can further focus light, can adjust the angle of the main light, optimize imaging quality, correct residual aberration (such as distortion, chromatic aberration and the like), and reduce distortion of the wide-angle lens.

In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy 0.62< BFL/f <0.9. The optical lens meets the above range, is beneficial to achieving balance between good imaging quality and optical back focal length easy to assemble, ensures the imaging quality of the optical lens, avoids interference between the lens and other elements, and reduces the difficulty of the assembly process of the camera module.

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-50 < R1/R2<8. The above conditions are met, the surface type of the first lens can be reasonably set, and the light collecting capacity of the first lens is enhanced, so that an ultra-large field angle is realized.

In some embodiments, the object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy 5< (R3+R4)/(R3-R4) <6. The range is satisfied, so that the light trend is more stable.

In some embodiments, the object-side radius of curvature R5 of the third lens and the image-side radius of curvature R6 of the third lens satisfy 2.7< (R5+R6)/(R5-R6) <6.3. The range is satisfied, coma aberration and curvature of field can be corrected, the imaging flatness is improved, and the imaging quality of the optical lens is improved.

In some embodiments, the object-side radius of curvature R11 of the sixth lens and the image-side radius of curvature R12 of the sixth lens satisfy-11 < (R11+R12)/(R11-R12) <0.15. The lens can alleviate the deflection degree of light passing through the lens and effectively reduce aberration.

In some embodiments, the object-side radius of curvature R13 of the seventh lens and the image-side radius of curvature R14 of the seventh lens satisfy 0.32< (R13+R14)/(R13-R14) <0.8. The range is met, the shapes of the object side surface and the image side surface of the seventh lens are reasonably limited, the seventh lens can be controlled to have proper surface shapes, the control of the light ray trend of the edge view field is facilitated, and the imaging quality of the edge view field is improved.

In some embodiments, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy-3.3 < f3/f4< -1.6. The focal length of the third lens and the focal length of the fourth lens are reasonably set, the length of the system can be shortened, aberration and distortion of an edge view field are reduced, the lens has small distortion, and a high-definition imaging effect can be provided.

In some embodiments, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy-1.7 < f1/f7< -1.4. The focal length relation of the head lens and the tail lens in the lens is reasonably set, so that the area of light entering an imaging surface is increased while the condition that as much light as possible enters the system is ensured, the imaging of a large imaging surface of the lens is facilitated, meanwhile, the light inlet quantity is increased, and the relative illumination of the system is improved.

In some embodiments, the center thickness CT3 of the third lens and the center thickness CT4 of the fourth lens satisfy 0.58< CT3/CT4<1. The ratio of the thickness of the third lens on the optical axis to the thickness of the fourth lens on the optical axis is reasonably configured, and the third lens and the fourth lens can be mutually regulated and controlled, so that the miniaturization characteristic of the optical system is maintained.

In some embodiments, the sum of center thicknesses of the first lens to the seventh lens along the optical axis Σct and the total optical length TTL of the optical lens respectively satisfy 0.65< Σct/TTL <0.75. 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 object-side clear half-bore sagittal height SAG21 of the second lens and the image-side clear half-bore sagittal height SAG22 of the second lens satisfy-0.02 < SAG21-SAG22<0.65. The method has the advantages that the relation between the vector height of the image side surface of the second lens and the vector height of the object side surface is controlled, the shape of the second lens is restrained, the opening angle of the lens of the second lens is reasonably controlled, and further manufacturability of the lens is improved. In addition, by reasonably constraining the lens shape of the second lens, the risk of the second lens generating ghosts can be effectively reduced.

In some embodiments, the object-side light-transmitting half-gauge DM11 of the first lens and the image-side light-transmitting half-gauge DM72 of the seventh lens satisfy 1.5< DM11/DM72<2. The lens meets the conditions, ensures that light rays in a large range enter the system, simultaneously effectively reduces the caliber size of the lens, and is beneficial to realizing the balance of a large view field and a small caliber of the lens.

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 2.2< IH/EPD <2.6. The range is met, so that the optical lens can meet the requirement of having sufficient image surface brightness in the edge view field while meeting the requirement of a large image surface, and the phenomenon of dark corners is prevented, thereby improving the imaging quality.

In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens and the radian value θ of the maximum half field angle of the optical lens satisfy 0.92< (IH/2)/(f x θ) <0.97. The above range is satisfied, so that the lens has a small distortion value and can provide a high-definition imaging effect.

In some embodiments, the optical lens satisfies the conditional expression 24mm < TTL <36mm,3.5mm < f <3.9mm,140 DEG < FOV <150 DEG, 8.5mm < IH <9.2mm,1< FNo <1.1, wherein TTL represents the total optical length of the optical lens, f represents the effective focal length of the optical lens, FOV represents the maximum field angle of the optical lens, IH represents the true image height corresponding to the maximum field angle of the optical lens, and FNo represents the aperture value of the optical lens. The above conditions are satisfied, which indicates that the optical lens provided by the embodiment of the invention has at least one or more advantages of large image plane, large field angle, large aperture, and the like.

In some embodiments, the seven lenses in the optical lens can all adopt plastic lenses or adopt a glass-plastic mixed material collocation structure, and preferably, the optical lens adopts the seven-lens glass-plastic mixed collocation lens structure, so that the thermal stability can be improved. The optical lens comprises a first lens, a fourth lens, a second lens, a third lens, a fifth lens, a sixth lens and a seventh lens, wherein the first lens and the fourth lens are glass lenses, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are plastic lenses, and the optical lens product with higher cost performance can be provided by adopting a glass-plastic mixed structure.

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 and the fourth lens adopt spherical lenses, and the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens can adopt aspherical 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 an embodiment 1 of the present invention is shown, where the optical lens 100 includes, in order from an object side to an imaging surface S19 along an optical axis, a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a cover glass G2.

The first lens element L1 has a negative 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 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 positive refractive power, wherein an object-side surface S9 thereof is convex, 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 convex at the paraxial region thereof;

the seventh lens element L7 with positive refractive power has a convex object-side surface S13 and a convex image-side surface S14;

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

the object side surface S17 and the image side surface S18 of the protective glass G2 are planes;

the imaging surface S19 is a plane.

The first lens L1 and the fourth lens L4 are glass spherical lenses, and the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are plastic aspherical 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- θ distortion curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 100 are shown in fig. 2,3,4, and 5, respectively.

Fig. 2 shows a field curve diagram of the optical lens 100 in this embodiment, which indicates the degree of curvature of light on the meridional image plane and the 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 ±0.15mm, which indicates that the optical lens 100 can correct curvature of field well.

Fig. 3 shows an f- θ distortion graph of the optical lens 100 in this embodiment, which represents distortion at 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 ±8%, 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 offset of the axial aberration is controlled within ±0.08mm, which indicates 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 ±8 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 an embodiment 2 of the present invention is shown, and the main difference between the present embodiment and the embodiment 1 is that the image side surface S10 of the fifth lens element L5 is concave at a paraxial region, the image side surface S12 of the sixth lens element L6 is concave, 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 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- θ distortion curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 200 are shown in fig. 7, 8, 9, and 10, respectively.

As can be seen from fig. 7, the curvature of field of the meridional image plane and the sagittal image plane is controlled within ±0.15mm, which indicates that the optical lens 200 can correct curvature of field well.

As can be seen from fig. 8, the distortion value is controlled within ±8%, which indicates that the optical lens 200 can correct the distortion well.

As can be seen from fig. 9, the offset of the axial aberration is controlled within ±0.1mm, which means 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 ±8μm, 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 differences of the present invention are that the object-side surface S1 of the first lens element L1 is concave, the image-side surface S8 of the fourth lens element L4 is concave, the image-side surface S10 of the fifth lens element L5 is concave at a paraxial region, the image-side surface S12 of the sixth lens element L6 is concave, and the optical parameters such as the radius of curvature and the lens thickness of the lens surfaces 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 field curvature curve, the f- θ distortion curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 300 are shown in fig. 12, 13, 14, and 15, respectively.

As can be seen from fig. 12, the curvature of field of the meridional image plane and the sagittal image plane is controlled within ±0.15mm, which means that the optical lens 300 can correct curvature of field well.

As can be seen from fig. 13, the distortion value is controlled within ±8%, 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 ±0.1mm, 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 ±8μm, indicating that the optical lens 300 can correct chromatic aberration well.

Referring to table 4, 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 4 Table 4

In summary, the optical lens provided by the embodiment of the invention adopts a seven-piece glass-plastic mixed structure, 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 arrangement and reasonable focal power distribution, so that the lens has one or more advantages of ultra wide angle, ultra large aperture, large image plane, high pixel, high imaging quality and the like.

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 in total, in order from an object side to an imaging surface along an optical axis, comprising:

2. The optical lens according to claim 1, wherein the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy 6.2< TTL/f <7.5.

3. The optical lens according to claim 1, wherein an effective focal length f of the optical lens, a maximum field angle FOV of the optical lens, and a real image height IH corresponding to the maximum field angle of the optical lens satisfy 55 ° < (f x FOV)/IH <65 °.

4. 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 total optical length TTL of the optical lens satisfy 2.6< TTL/IH <3.

5. 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-2.7 < f1/f < -1.9.

6. The optical lens according to claim 1, wherein an effective focal length f of the optical lens and a focal length f4 of the fourth lens satisfy 2.4< f4/f <3.4.

7. The optical lens according to claim 1, wherein an effective focal length f of the optical lens and a focal length f7 of the seventh lens satisfy 1.3< f7/f <1.7.

8. 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 8mm < IH/Fno <9.2mm.

9. The optical lens of claim 1, wherein the object-side light-passing half-caliber sagittal height SAG51 of the fifth lens and the center thickness CT5 of the fifth lens satisfy 0.3< SAG51/CT5<0.38.

10. The optical lens of claim 1, wherein a total optical length TTL of 0.01< (CT34+CT45+CT56+CT67)/TTL <0.04 is satisfied by a distance CT34 of the third lens and the fourth lens on an optical axis, a distance CT45 of the fourth lens and the fifth lens on an optical axis, a distance CT56 of the fifth lens and the sixth lens on an optical axis, a distance CT67 of the sixth lens and the seventh lens on an optical axis, and the optical lens.