CN118348660A

CN118348660A - Optical lens

Info

Publication number: CN118348660A
Application number: CN202410787616.1A
Authority: CN
Inventors: 谢雨辰; 徐丽丽; 章彬炜
Original assignee: Jiangxi Lianyi Optics Co Ltd
Current assignee: Jiangxi Lianyi Optics Co Ltd
Priority date: 2024-06-18
Filing date: 2024-06-18
Publication date: 2024-07-16
Anticipated expiration: 2044-06-18
Also published as: CN118348660B

Abstract

The invention provides an optical lens, which comprises six lenses in sequence from an object side to an imaging surface along an 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; 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 element with negative refractive power having a concave object-side surface and a convex image-side surface; a fifth 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; the sixth lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region. The optical lens provided by the invention can improve the imaging quality of the optical lens, reduce the aberration, improve the imaging quality of the optical lens, and enable the lens to have one or more advantages of miniaturization, large aperture, high pixel, high imaging quality and the like.

Description

Optical lens

Technical Field

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

Background

Currently, the mainstream trend of the development of portable electronic products is ultra-thin, wide-angle, ultra-high definition imaging, etc., and this trend has put higher demands on optical lenses mounted on the portable electronic products. The pixel point size of the sensor chip is not reduced while the pixel is high, so that the increase of the size of the sensor chip becomes an important development trend of the high pixel. Because consumers use scenes of electronic products more and more, if shooting is required in dim light environments such as overcast and rainy days and night, even in dim environments, the problems of darker shooting pictures, fuzzy details, unclear shooting and the like of the optical lenses currently carried on the electronic products in the dim environments result in poor shooting effect.

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 adopts the technical scheme that:

an optical lens comprising six lenses in order from an object side to an imaging surface along an 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;

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

a fifth 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 sixth 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;

The focal length f5 of the fifth lens and the object-side curvature radius R9 of the fifth lens satisfy: 12< f5/R9<37; the focal length f5 of the fifth lens and the image-side curvature radius R10 of the fifth lens satisfy the following conditions: 10< f5/R10<37.

Further preferably, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 0.7< TTL/IH <0.9.

Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: f5/f >18.

Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: f6/f < -11.

Further preferably, the effective focal length f of the optical lens and the object-side curvature radius R3 of the second lens satisfy: 0.7< R3/f <1; the effective focal length f of the optical lens and the image side curvature radius R4 of the second lens satisfy the following conditions: 0.4< R4/f <0.6.

Further preferably, the effective focal length f of the optical lens and the object-side curvature radius R11 of the sixth lens satisfy: 0.65< R11/f <0.85; the effective focal length f of the optical lens and the image side curvature radius R12 of the sixth lens satisfy the following conditions: 0.5< R12/f <0.75.

Further preferably, the object-side radius of curvature R9 of the fifth lens and the image-side radius of curvature R10 of the fifth lens satisfy: 0.8< R9/R10<1.1.

Further preferably, the object-side radius of curvature R9 of the fifth lens and the image-side radius of curvature R10 of the fifth lens satisfy: (R9+R10)/(R9-R10) < -15.

Further preferably, the object-side light-transmitting half-aperture sagittal height Sag11 of the sixth lens and the object-side light-transmitting half-aperture d11 of the sixth lens satisfy: -0.15< Sag11/d11<0; the image side light-transmitting half-caliber sagittal height Sag12 of the sixth lens and the image side light-transmitting half-caliber d12 of the sixth lens satisfy the following conditions: -0.25< Sag12/d12<0.

Further preferably, a perpendicular distance YC11 between the inflection point on the object side surface of the sixth lens and the optical axis and an object side surface light-transmitting half-aperture d11 of the sixth lens satisfy: 0.3< YC11/d11<0.4; the vertical distance YC12 between the inflection point on the image side surface of the sixth lens element and the optical axis and the half aperture d12 of the image side surface of the sixth lens element satisfy the following conditions: 0.4< YC12/d12<0.55.

The optical lens provided by the invention adopts six 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 large aperture, miniaturization, 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-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 graph showing the relative illuminance of the 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-Tanθ distortion of an optical lens in example 2 of the present invention.

Fig. 9 is a vertical axis chromatic aberration diagram of an optical lens in embodiment 2 of the present invention.

Fig. 10 is a graph showing the relative illuminance of the 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-Tanθ distortion of an optical lens in example 3 of the present invention.

Fig. 14 is a vertical axis chromatic aberration chart of the optical lens in embodiment 3 of the present invention.

Fig. 15 is a graph showing the relative illuminance of the 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 a graph showing the field curvature of an optical lens in embodiment 4 of the present invention.

FIG. 18 is a graph showing F-Tanθ distortion of an optical lens in example 4 of the present invention.

Fig. 19 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 4 of the present invention.

Fig. 20 is a graph showing the relative illuminance of the 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 comprises six lenses, wherein 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 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 positive refractive power, wherein an object-side surface thereof is convex and an image-side surface thereof is concave. The fourth lens element with negative refractive power has a concave object-side surface and a convex image-side surface. The fifth 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 sixth 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.

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 f5 of the fifth lens and the object-side radius of curvature R9 of the fifth lens satisfy: 12< f5/R9<37. The focal length f5 of the fifth lens and the image-side curvature radius R10 of the fifth lens satisfy: 10< f5/R10<37. Satisfying the above range, reasonably controlling the focal length of the fifth lens and the shapes of the object side and the image side thereof contributes to the advantages of the optical lens having a short total length and a large aperture.

In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 0.7< TTL/IH <0.9. The optical lens meets the above range, controls the total length and the image height of the optical lens within proper ranges, and is beneficial to the optical lens to have the advantages of short total length and large image plane.

In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: f5/f >18. More specifically, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 18< f5/f <25. The range is met, the fifth lens is controlled to have proper positive focal power, smooth light trend is facilitated, and imaging quality of the lens is improved.

In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: f6/f < -11. More specifically, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -18< f6/f < -11. The range is met, the sixth lens is controlled to have proper negative focal power, so that the spherical aberration can be optimized, and the imaging quality of the lens can be improved.

In some embodiments, the effective focal length f of the optical lens and the object-side radius of curvature R3 of the second lens satisfy: 0.7< R3/f <1; the effective focal length f of the optical lens and the image-side curvature radius R4 of the second lens satisfy: 0.4< R4/f <0.6. The optical lens has the advantages that the range is met, the shapes of the object side surface and the image side surface of the second lens are reasonably controlled, stray light is reduced, meanwhile, the aberration of an edge view field can be effectively improved, and the overall imaging quality of the optical lens is improved.

In some embodiments, the effective focal length f of the optical lens and the object-side radius of curvature R11 of the sixth lens satisfy: 0.65< R11/f <0.85; the effective focal length f of the optical lens and the image-side curvature radius R12 of the sixth lens satisfy: 0.5< R12/f <0.75. The lens has the advantages that the shapes of the object side surface and the image side surface of the sixth lens are reasonably controlled, light rays of the edge view field can be converged, field curvature of the outer view field can be corrected, and imaging quality of the optical lens is improved.

In some embodiments, the object-side radius of curvature R9 of the fifth lens and the image-side radius of curvature R10 of the fifth lens satisfy: 0.8< R9/R10<1.1. The spherical aberration correction method meets the above range, reasonably controls the shapes of the object side surface and the image side surface of the fifth lens, is beneficial to correcting the spherical aberration of the optical lens, and improves the imaging quality of the optical lens.

In some embodiments, the object-side radius of curvature R9 of the fifth lens and the image-side radius of curvature R10 of the fifth lens satisfy: (R9+R10)/(R9-R10) < -15. The method meets the range, reasonably controls the shapes of the object side surface and the image side surface of the fifth lens, is favorable for controlling the edge view field beam trend to increase the image height, and simultaneously reduces the off-axis aberration of the optical lens.

In some embodiments, the object-side light-passing half-aperture sagittal height Sag11 of the sixth lens and the object-side light-passing half-aperture d11 of the sixth lens satisfy: -0.15< Sag11/d11<0; the image-side light-transmitting half-caliber sagittal height Sag12 of the sixth lens and the image-side light-transmitting half-caliber d12 of the sixth lens satisfy the following conditions: -0.25< Sag12/d12<0. The relation between the sagittal height of the object side surface and the image side surface of the sixth lens and the light-transmitting half aperture is reasonably controlled, the trend of the marginal view field light is controlled, and the detail information of the central view field of the optical lens is highlighted.

In some embodiments, the perpendicular distance YC11 between the inflection point on the object side of the sixth lens element and the optical axis and the object-side light-transmitting half-aperture d11 of the sixth lens element satisfy: 0.3< YC11/d11<0.4; the vertical distance YC12 between the inflection point on the image side of the sixth lens element and the optical axis and the half aperture d12 of the image side light passing through the sixth lens element satisfy: 0.4< YC12/d12<0.55. The range is met, the positions of the inflection points on the object side surface and the image side surface of the sixth lens are reasonably controlled, the aberration correction of the off-axis view field is enhanced, and the imaging quality of the edge view field is improved.

In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 1< f1/f <1.3. The range is satisfied, and the first lens is controlled to have proper positive focal power, so that the light rays are converged, the light ray deflection angle is reduced, and the light ray trend is stable.

In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -2.1< f2/f < -1.7. The range is satisfied, and the second lens is controlled to have proper negative focal power, so that overlarge light deflection caused by overlarge focal power can be avoided, and the chromatic aberration correction difficulty of the optical lens can be reduced.

In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.7< f3/f <2.3. The range is satisfied, and the third lens is controlled to have proper positive focal power, so that the aberration of the lens is balanced, and the imaging quality is improved.

In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -20< f4/f < -10. The range is met, the fourth lens is controlled to have proper negative focal power, so that the negative focal power of the front-end lens is shared, and the distortion correction difficulty of the optical lens is reduced.

In some embodiments, the combined focal length f123 of the first, second, and third lenses and the fourth, fifth, and sixth lenses f456 satisfy: -0.15< f123/f456<0. The range is met, the ratio of the focal power of the first lens to the third lens to the focal power of the fourth lens to the sixth lens is controlled, the focal power of the optical lens is reasonably configured, and the structural compactness of the optical lens is guaranteed.

In some embodiments, the combined focal length f23 of the second lens and the third lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: -0.8< f23/f45<1.3. The above range is satisfied, and controlling the ratio of the optical powers of the second and third lenses to the optical powers of the fourth and fifth lenses helps to ensure reasonable optical power distribution of the optical lens and can reduce aberrations.

In some embodiments, the effective focal length f of the optical lens and the object-side radius of curvature R6 of the third lens satisfy: 1< R6/f <1.8. The range is satisfied, the shape of the image side surface of the third lens is reasonably controlled, the field curvature is reduced, and the imaging quality of the optical lens is improved.

In some embodiments, the image-side radius of curvature R2 of the first lens and the object-side radius of curvature R3 of the second lens satisfy: 5< (R2+R3)/(R2-R3) <22. The shape of the image side surface of the first lens and the shape of the object side surface of the second lens are reasonably controlled, so that the distortion generated by the front-end lens can be reduced, and the distortion correction difficulty of the rear-end lens can be reduced.

In some embodiments, the center thickness CT6 of the sixth lens and the edge thickness ET6 of the sixth lens satisfy: 0.5< ET6/CT6<0.85. The range is met, the edge-to-thickness ratio of the sixth lens is reasonably controlled, the processing difficulty of the lens can be reduced, and meanwhile, the aberration of the edge view field can be corrected.

In some embodiments, the optical lens satisfies the following conditional expression ：3.6mm<f<4.5mm;70°<FOV<82°;4.4mm<TTL<5.1mm;FNO<1.65;6mm<IH<7mm;30°<CRA<40°., where f represents an effective focal length of the optical lens, FOV represents a maximum field angle of the optical lens, EPD represents an entrance pupil diameter 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 true image height corresponding to the maximum field angle of the optical lens, and CRA represents a chief ray incidence angle at the maximum image height of the optical lens. Satisfying the above ranges, the optical lens has at least one or more advantages of miniaturization, large aperture, high pixel, and the like.

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

In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens may be spherical lenses or aspherical lenses, and compared with spherical structures, the aspherical structures can effectively reduce the aberration of the optical system, so that the number of lenses and the size of the lenses are reduced, and miniaturization of the lens is better achieved. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens of the present invention all 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, I, J is the fourth, sixth, eighth, tenth, fourteen, sixteen, eighteen 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 100 includes, in order 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, 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 positive 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 negative refractive power, wherein an object-side surface S7 thereof is concave, 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 at a paraxial region thereof and an image-side surface S10 thereof is concave at the paraxial region thereof;

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

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, the vertical axis chromatic aberration curve, and the relative illuminance curve of the optical lens 100 are shown in fig. 2, 3, 4, and 5, 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 half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.2 mm to 0.1mm, which indicates that the optical lens can well correct the field curvature.

Fig. 3 shows the F-Tan θ distortion curve of example 1, which represents the F-Tan θ distortion at different image heights on the imaging plane, the horizontal axis represents the F-Tan θ distortion value (unit:%) and the vertical axis represents the half field angle (unit: °). From the figure, the F-Tanθ distortion of the optical lens is controlled within +/-2%, the image compression of the edge angle area is gentle, and the definition of the unfolded image is effectively improved.

Fig. 4 shows a vertical axis color difference graph of example 1, which represents 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 representing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis representing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-2 mu m, which shows that the optical lens can excellently correct chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.

Fig. 5 shows the relative illuminance curve of example 1, which represents the relative illuminance values for different field angles on the imaging plane, the horizontal axis represents the half field angle (in: °), and the vertical axis represents the relative illuminance (in:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 30% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.

Example 2

Referring to fig. 6, 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, the vertical axis chromatic aberration curve, and the relative illuminance 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 ±0.2mm, which means that the optical lens 200 can correct curvature of field well.

As can be seen from fig. 8, the F-Tan θ distortion of the optical lens 200 is controlled within 0-2%, the image compression in the edge angle area is gentle, and the definition of the unfolded image is effectively improved.

As can be seen from fig. 9, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, which means that the optical lens 200 can excellently correct chromatic aberration of the fringe field of view and the secondary spectrum of the entire image plane.

As can be seen from fig. 10, the relative illuminance value of the optical lens 200 is still greater than 30% at the maximum half angle of view, which indicates that the optical lens 200 has a better relative illuminance.

Example 3

Referring to fig. 11, a schematic structural diagram of an optical lens 300 provided in 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, the vertical axis chromatic aberration curve, and the relative illuminance 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 ±0.2mm, which means that the optical lens 300 can correct curvature of field well.

As can be seen from fig. 13, the F-Tan θ distortion of the optical lens 300 is controlled within ±2%, and the image compression in the edge angle region is relatively gentle, thereby effectively improving the sharpness of the unfolded image.

As can be seen from fig. 14, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 300 can excellently correct chromatic aberration of the fringe field of view and the secondary spectrum of the entire image plane.

As can be seen from fig. 15, the relative illuminance value of the optical lens 300 at the maximum half angle of view is still greater than 30%, which indicates that the optical lens 300 has a better relative illuminance.

Example 4

Referring to fig. 16, 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 400 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, the vertical axis chromatic aberration curve, and the relative illuminance curve of the optical lens 400 are shown in fig. 17, 18, 19, and 20, respectively.

As can be seen from fig. 17, the curvature of field of the meridional image plane and the sagittal image plane is controlled within ±0.8mm, which means that the optical lens 400 can satisfactorily correct curvature of field.

As can be seen from fig. 18, the F-Tan θ distortion of the optical lens 400 is controlled within ±2%, and the image compression in the edge angle region is relatively gentle, thereby effectively improving the sharpness of the unfolded image.

As can be seen from fig. 19, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 400 can excellently correct chromatic aberration of the fringe field of view and the secondary spectrum of the entire image plane.

As can be seen from fig. 20, the relative illuminance value of the optical lens 400 at the maximum half angle of view is still greater than 30%, which indicates that the optical lens 400 has a better relative illuminance.

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 chief ray incident angle CRA at the maximum image height, the real image height IH corresponding to the maximum field angle, 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 adopts six lenses with specific focal power, and through specific surface shape collocation and reasonable focal power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, the imaging quality of the optical lens can be improved, and the lens has one or more advantages of large aperture, miniaturization, high pixel, high imaging quality, etc.

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 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 real image height IH corresponding to the total optical length TTL and the maximum field angle of the optical lens satisfies: 0.7< TTL/IH <0.9.

3. 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: f5/f >18.

4. 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: f6/f < -11.

5. The optical lens of claim 1, wherein an effective focal length f of the optical lens and an object-side radius of curvature R3 of the second lens satisfy: 0.7< R3/f <1; the effective focal length f of the optical lens and the image side curvature radius R4 of the second lens satisfy the following conditions: 0.4< R4/f <0.6.

6. The optical lens of claim 1, wherein an effective focal length f of the optical lens and an object-side radius of curvature R11 of the sixth lens satisfy: 0.65< R11/f <0.85; the effective focal length f of the optical lens and the image side curvature radius R12 of the sixth lens satisfy the following conditions: 0.5< R12/f <0.75.

7. The optical lens of claim 1, wherein an object-side radius of curvature R9 of the fifth lens and an image-side radius of curvature R10 of the fifth lens satisfy: 0.8< R9/R10<1.1.

8. The optical lens of claim 1, wherein an object-side radius of curvature R9 of the fifth lens and an image-side radius of curvature R10 of the fifth lens satisfy: (R9+R10)/(R9-R10) < -15.

9. The optical lens system according to claim 1, wherein the object-side light-transmitting half-aperture sagittal height Sag11 of the sixth lens element and the object-side light-transmitting half-aperture d11 of the sixth lens element satisfy: -0.15< Sag11/d11<0; the image side light-transmitting half-caliber sagittal height Sag12 of the sixth lens and the image side light-transmitting half-caliber d12 of the sixth lens satisfy the following conditions: -0.25< Sag12/d12<0.

10. The optical lens system according to claim 1, wherein a perpendicular distance YC11 between the inflection point on the object side surface of the sixth lens element and the optical axis and an object-side light-transmitting half-diameter d11 of the sixth lens element satisfy: 0.3< YC11/d11<0.4; the vertical distance YC12 between the inflection point on the image side surface of the sixth lens element and the optical axis and the half aperture d12 of the image side surface of the sixth lens element satisfy the following conditions: 0.4< YC12/d12<0.55.