CN113484997B - Optical lens, camera module and electronic equipment - Google Patents

Optical lens, camera module and electronic equipment Download PDF

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Publication number
CN113484997B
CN113484997B CN202111046559.4A CN202111046559A CN113484997B CN 113484997 B CN113484997 B CN 113484997B CN 202111046559 A CN202111046559 A CN 202111046559A CN 113484997 B CN113484997 B CN 113484997B
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lens
lens element
optical
image
optical lens
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CN113484997A (en
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党绪文
李明
刘彬彬
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Jiangxi Jingchao Optical Co Ltd
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Jiangxi Jingchao Optical Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles

Abstract

The invention discloses an optical lens, a camera module and electronic equipment, wherein the optical lens comprises a first lens with negative refractive power, which is arranged in sequence from an object side to an image side along an optical axis, and the object side surface of the first lens is a concave surface; a second lens element with refractive power having a concave image-side surface; a third lens element with refractive power having a convex object-side surface; a fourth lens element, a fifth lens element, and a sixth lens element with refractive power; a seventh lens element with refractive power having a convex object-side surface; at least one surface of the first lens to the seventh lens is of a non-rotational symmetry plane type; meanwhile, the optical lens meets the condition that 36 degrees < (FOV/TTL) > f <45.5 degrees, the FOV is the maximum field angle of the optical lens, the TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and f is the effective focal length of the optical lens. The optical lens, the camera module and the electronic equipment provided by the invention can realize the requirements of miniaturization, lightness and thinness, large field angle and high-quality imaging.

Description

Optical lens, camera module and electronic equipment
Technical Field
The invention relates to the technical field of optical imaging, in particular to an optical lens, a camera module and electronic equipment.
Background
Currently, with the development of the camera shooting technology, various electronic devices (such as digital cameras, smart phones, notebook computers, tablet computers, etc.) with camera shooting modules are widely used. As the demand for portability of electronic devices has increased, the size of camera modules mounted on electronic devices has become more stringent, i.e., miniaturization and weight reduction of camera modules have become a necessary development demand. However, while the camera module is miniaturized and light and thin, the angle of view and the imaging quality of the camera module are greatly affected, and the design requirements cannot be met. Therefore, how to achieve a large field angle and improve an imaging effect while achieving miniaturization and lightness of the camera module is a problem that needs to be solved at present.
Disclosure of Invention
The embodiment of the invention discloses an optical lens, a camera module and electronic equipment.
In order to achieve the above object, in a first aspect, embodiments of the present invention disclose an optical lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in order from an object side to an image side along an optical axis; the first lens element with negative refractive power has a concave object-side surface at paraxial region; the second lens element with refractive power has a concave image-side surface at paraxial region; the third lens element with refractive power has a convex object-side surface at paraxial region; the fourth lens element with refractive power; the fifth lens element with refractive power; the sixth lens element with refractive power; the seventh lens element with refractive power has a convex object-side surface at paraxial region; at least one surface of the first lens to the seventh lens is a non-rotational-symmetry surface type; the optical lens satisfies the following relation: 36 ° < (FOV/TTL) × f <45.5 °; wherein, the FOV is a maximum field angle of the optical lens, the TTL is a distance from an object-side surface of the first lens element to an imaging surface of the optical lens on the optical axis, and f is an effective focal length of the optical lens.
In the optical lens of the first aspect of the present application, the first lens element with negative refractive power is adopted, so that the total optical length of the optical lens can be shortened to meet the miniaturization requirement of the optical lens, and meanwhile, the spherical aberration of the optical lens can be reduced to ensure the imaging quality of the optical lens; when incident light passes through the first lens, the object side surface of the first lens is matched with the concave surface type arrangement at the position of a paraxial region, so that the wide-view requirement is realized. When the incident light passes through the second lens, the image side surface of the second lens is a concave surface, so that the incident light can enter the third lens at a more proper angle. The design of the surface of the third lens element with the convex object-side surface at the paraxial region can enhance the refractive power of the third lens element, thereby improving the compactness of the structure between the lens elements of the optical lens assembly and realizing the miniaturization of the optical lens assembly. When the incident light beam passes through the seventh lens element, the object-side surface of the seventh lens element is convex at a paraxial region thereof, so that the defects of distortion, astigmatism, curvature of field, and the like of the incident light beam passing through the first lens element and the sixth lens element can be corrected, thereby achieving the low aberration and high quality imaging requirements of the optical lens assembly. Meanwhile, at least one of the first lens and the seventh lens of the optical lens is set to be a non-rotational symmetry plane type, so that the design freedom of a refraction curved surface of the optical lens is increased, the midfield curvature and the sagittal curvature are effectively corrected, the aberrations such as astigmatism and distortion of the optical lens can be inhibited, and the imaging quality of the optical lens is improved. In addition, when the optical lens meets 36 ° < (FOV/TTL) × f <45.5 °, the optical lens can meet the requirements of miniaturization and lightness, and maintain the characteristic of a large field angle, so as to ensure the imaging quality of the optical lens.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.75< SD11/SD72< 0.9; wherein SD11 is the maximum effective half aperture of the object-side surface of the first lens, and SD72 is the maximum effective half aperture of the image-side surface of the seventh lens. The ratio of the effective half aperture of the object side surface of the first lens to the effective half aperture of the image side surface of the seventh lens from the object side of the optical lens can reflect the aperture size of the top and the bottom of the lens barrel adapted to the optical lens, and when the above relational expression is satisfied, the ratio can be controlled within a reasonable range, and the aperture of the first lens is smaller than the aperture of the seventh lens, so that the design of the lens barrel head of the optical lens is more miniaturized, and the market demand for the wide-angle small-head lens is further satisfied.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.3< (CT12+ CT23)/CT1< 0.8; wherein CT12 is a distance on the optical axis from the image-side surface of the first lens element to the object-side surface of the second lens element, CT23 is a distance on the optical axis from the image-side surface of the second lens element to the object-side surface of the third lens element, and CT1 is a distance on the optical axis from the object-side surface of the first lens element to the image-side surface of the first lens element. When the above relational expression is satisfied, the problem of difficult processes such as processing and assembling of the optical lens due to excessively small gaps between the first lens and the second lens and between the second lens and the third lens can be avoided, and the total length of the optical lens can be reduced by controlling the gaps between the lenses, so that the design requirements of miniaturization and lightness of the optical lens can be satisfied. In addition, when the ratio of the above relational expression is controlled in the above range and is as close to the lower limit value as possible, the thicknesses of the first lens and the second lens can be reduced, the distances between the first lens and the diaphragm and the distances between the second lens and the diaphragm can be reduced, and the calibers of the first lens and the second lens can be reduced, so that the small head design requirement of the wide-angle lens can be met.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.25< (CT45+ CT56+ CT67)/BF < 0.6; wherein CT45 is a distance between an image-side surface of the fourth lens element and an object-side surface of the fifth lens element on the optical axis, CT56 is a distance between the image-side surface of the fifth lens element and an object-side surface of the sixth lens element on the optical axis, CT67 is a distance between the image-side surface of the sixth lens element and an object-side surface of the seventh lens element on the optical axis, and BF is a shortest distance between the image-side surface of the seventh lens element and an image plane of the optical lens element along the optical axis. When the optical lens meets the relational expression, the size of a gap between lenses and the size of a back focus can be effectively controlled, the structural compactness of the optical lens is further kept, the miniaturization design requirement of the optical lens is realized, meanwhile, the back focus is controlled within a proper range, when the optical lens is applied to a camera module, the gap between the optical lens and an image sensor of the camera module can be more reasonable, and the assembly difficulty of the optical lens is reduced.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: i (SAXY 11-SAGD 11)/(SAXY 11+ SAGD 11) | < 0.0055; SAGY11 is a distance on the optical axis between a projection of an edge of an optically effective area of an object side surface of the first lens in the Y direction on the optical axis and an intersection point of the object side surface of the first lens and the optical axis, and SAGX11 is a distance on the optical axis between a projection of an edge of an optically effective area of an object side surface of the first lens in the X direction on the optical axis and an intersection point of the object side surface of the first lens and the optical axis. The X direction is perpendicular to the optical axis, and the Y direction is perpendicular to the X direction and the optical axis at the same time. When the first lens uses the symmetric coefficient of the non-rotational symmetric surface type, the degree of freedom and the aberration constraint force of the optical lens can be optimized, and meanwhile, the development trend of the processing capacity of the current lens is met, and the practicability is high. When the design of the first lens element satisfies the above relation, the first lens element bears a small refractive power, and the feature of the XY non-rotationally symmetric curved surface of the first lens element is utilized to increase the aperture of the optical lens and correct the peripheral field aberration, and the surface shape of the first lens element can be changed slowly, so that the first lens element has good processability.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.0< CT3/ET3< 2.2; CT3 is a distance between an object-side surface of the third lens element and an image-side surface of the third lens element along the optical axis, i.e., a center thickness of the third lens element, and ET3 is a distance between a maximum effective half aperture of the object-side surface of the third lens element and a maximum effective half aperture of the image-side surface of the third lens element along the optical axis, i.e., an edge thickness of the third lens element. By controlling the ratio of the center thickness to the edge thickness of the third lens element within the above range, the amount of refractive power of the third lens element can be controlled, the surface-form inclination angle of the third lens element can be reduced, and the refractive power balance between the lens elements of the optical lens can be realized to balance the aberrations contributed by the lens elements.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.5< | R52/R62| < 15; wherein R52 is a curvature radius of the image-side surface of the fifth lens element on the optical axis, and R62 is a curvature radius of the image-side surface of the sixth lens element on the optical axis. When the optical lens meets the relational expression, the surface shapes of the fifth lens and the sixth lens are smooth, namely the shapes with smaller sinking of the lens surfaces are formed, so that the processing and manufacturing difficulty of the lenses is reduced, and the manufacturing cost of the optical lens is further reduced. Meanwhile, the limitation of the relational expression can better correct the defects of bending and distortion of the imaging surface of the optical lens, and can avoid the condition of serious ghost image caused by multiple reflections of the light rays in the lens due to the low-angle incidence of the incident light rays.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.5< (SD72-SD71)/ET7< 0.75; wherein SD72 is the maximum effective half aperture of the image-side surface of the seventh lens element, SD71 is the maximum effective half aperture of the object-side surface of the seventh lens element, and ET7 is the distance from the maximum effective half aperture of the object-side surface of the seventh lens element to the maximum effective half aperture of the image-side surface of the seventh lens element along the optical axis. Because the effective aperture of the seventh lens is determined by the edge of the seventh lens through which the maximum field-of-view light passes, and the limitation of the relational expression reflects the inclination degree of the trend of the maximum field-of-view light, when the value of the effective aperture meets the range, the maximum edge field-of-view light can keep a reasonable inclination angle when passing through the seventh lens, and further the chief ray of the maximum edge field-of-view light is constrained in a reasonable range, so that the condition that the angle of incidence of the field of view on the imaging surface of the optical lens is too large due to the too large inclination angle of the edge light is avoided, the incident light can be smoothly incident to the image sensor, and the difficulty in adapting the optical lens and the image sensor is reduced.
In a second aspect, the present invention discloses a camera module, which includes an image sensor and the optical lens of the first aspect, wherein the image sensor is disposed on the image side of the optical lens. The camera module with the optical lens has all the technical effects of the optical lens, namely, the camera module can meet the requirements of large field angle and realize high-quality imaging while being miniaturized and light and thin.
In a third aspect, the invention discloses an electronic device, which includes a housing and the camera module set according to the second aspect, wherein the camera module set is disposed on the housing. The electronic equipment with the camera module also has all the technical effects of the optical lens. In other words, the camera module of the electronic device can be miniaturized, thinned, and can meet the requirement of a large field angle and realize high-quality imaging.
Compared with the prior art, the invention has the beneficial effects that:
according to the optical lens, the camera module and the electronic device provided by the embodiment of the application, the optical lens adopts the first lens with negative refractive power, so that the total optical length of the optical lens can be shortened to meet the miniaturization requirement of the optical lens, and meanwhile, the spherical aberration of the optical lens can be reduced to ensure the imaging quality of the optical lens; when the incident light passes through the first lens, the object side surface of the first lens is in a concave surface type arrangement at the position of a paraxial region, so that the wide-view requirement is realized. When the incident light passes through the second lens, the image side surface of the second lens is a concave surface, so that the incident light can enter the third lens at a more proper angle. The design of the surface of the third lens element with the convex object-side surface at the paraxial region can enhance the refractive power of the third lens element, thereby improving the compactness of the structure between the lens elements of the optical lens assembly and realizing the miniaturization of the optical lens assembly. When the incident light passes through the seventh lens element, the object-side surface of the seventh lens element is convex at the paraxial region thereof, which can correct the distortion, astigmatism, and curvature of field of the incident light passing through the first lens element to the sixth lens element, thereby achieving the low aberration and high quality imaging requirements of the optical lens assembly. Meanwhile, at least one of the first lens to the seventh lens of the optical lens is set to be a non-rotational symmetry plane type, so that the design freedom degree of a refraction curved surface of the optical lens is increased, the midday field curvature and the sagittal field curvature are effectively corrected, the aberrations such as astigmatism and distortion of the optical lens can be inhibited, and the imaging quality of the optical lens is improved. In addition, when the optical lens meets 36 degrees < (FOV/TTL) > f <45.5 degrees, the optical lens can meet the requirements of miniaturization and lightness, and the characteristic of large field angle is kept, so that the imaging quality of the optical lens is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical lens disclosed in a first embodiment of the present application;
fig. 2 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical lens disclosed in the first embodiment of the present application;
FIG. 3 is a relative RMS spot diameter reference for an optical lens disclosed in a first embodiment of the present application;
fig. 4 is a schematic structural diagram of an optical lens disclosed in the second embodiment of the present application;
fig. 5 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical lens disclosed in the second embodiment of the present application;
FIG. 6 is a relative RMS spot diameter reference for an optical lens disclosed in a second embodiment of the present application;
fig. 7 is a schematic structural diagram of an optical lens disclosed in the third embodiment of the present application;
fig. 8 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical lens disclosed in the third embodiment of the present application;
FIG. 9 is a relative RMS spot diameter reference for an optical lens disclosed in a third embodiment of the present application;
fig. 10 is a schematic structural diagram of an optical lens disclosed in the fourth embodiment of the present application;
fig. 11 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical lens disclosed in the fourth embodiment of the present application;
FIG. 12 is a relative RMS spot diameter reference for an optical lens disclosed in a fourth embodiment of the present application;
fig. 13 is a schematic structural diagram of an optical lens disclosed in a fifth embodiment of the present application;
fig. 14 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical lens disclosed in the fifth embodiment of the present application;
FIG. 15 is a relative RMS spot diameter reference for an optical lens disclosed in a fifth embodiment of the present application;
fig. 16 is a schematic structural diagram of an optical lens disclosed in a sixth embodiment of the present application;
fig. 17 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical lens disclosed in the sixth embodiment of the present application;
FIG. 18 is a relative RMS spot diameter reference for an optical lens disclosed in a sixth embodiment of the present application;
fig. 19 is a schematic structural diagram of the camera module disclosed in the present application;
fig. 20 is a schematic structural diagram of an electronic device disclosed in the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.
The technical solution of the present invention will be further described with reference to the following embodiments and the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an optical lens 100 disclosed in the present application. The present application discloses in a first aspect an optical lens 100, the optical lens 100 including, in order from an object side to an image side along an optical axis O, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The first lens element L1 with negative refractive power, the second lens element L2 with positive or negative refractive power, the third lens element L3 with positive or negative refractive power, the fourth lens element L4 with positive or negative refractive power, the fifth lens element L5 with positive or negative refractive power, the sixth lens element L6 with positive or negative refractive power, and the seventh lens element L7 with positive or negative refractive power. During imaging, light enters the first lens L1, 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 in sequence from the object side of the first lens L1, and is finally imaged on the imaging surface 101 of the optical lens 100.
Further, the object-side surface 11 of the first lens element L1 is concave at the paraxial region O, and the image-side surface 12 of the first lens element L1 is convex or concave at the paraxial region O; the object-side surface 21 of the second lens element L2 is convex or concave at the paraxial region O, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region O; the object-side surface 31 of the third lens element L3 is convex at the paraxial region O, and the image-side surface 32 of the third lens element L3 is convex or concave at the paraxial region O; the object-side surface 41 of the fourth lens element L4 is convex or concave at the paraxial region O, and the image-side surface 42 of the fourth lens element L4 is convex or concave at the paraxial region O; the object-side surface 51 of the fifth lens element L5 is convex or concave at the paraxial region O, and the image-side surface 52 of the fifth lens element L5 is convex or concave at the paraxial region O; the object-side surface 61 of the sixth lens element L6 is convex or concave along the optical axis O, and the image-side surface 62 of the sixth lens element L6 is convex or concave along the optical axis O; the object-side surface 71 of the seventh lens element L7 is convex along the optical axis O, and the image-side surface 72 of the seventh lens element L7 is convex or concave along the optical axis O.
The optical lens 100 adopts the first lens element L1 with negative refractive power, so that the total optical length of the optical lens 100 can be shortened to meet the miniaturization requirement of the optical lens 100, and meanwhile, the spherical aberration of the optical lens 100 can be reduced to ensure the imaging quality of the optical lens 100; when the incident light passes through the first lens element L1, the object-side surface 11 of the first lens element L1 is concave at the paraxial region O, which is beneficial for the light with a large field range to enter the optical lens assembly 100, thereby achieving the requirement of wide viewing. When the incident light passes through the second lens L2, the incident light can be made to enter the third lens L3 at a more proper angle by the concave surface arrangement of the image side surface 22 of the second lens L2. The design of the convex object-side surface 31 of the third lens element L3 at the paraxial region O can enhance the refractive power of the third lens element L3, thereby improving the structural compactness between the lens elements of the optical lens system 100 and miniaturizing the optical lens system 100, and at the same time, by reasonably constraining the curvature radii of the convex object-side surface 31 of the third lens element L3 and the paraxial region O, the tolerance sensitivity of the third lens element L3 can be reduced, the manufacturing difficulty can be reduced, and the occurrence of stray light when incident light passes through the third lens element L3 can be avoided. When the incident light passes through the seventh lens element L7, the object-side surface 71 of the seventh lens element L7 is designed to have a convex surface at the paraxial region O, so that the defects of distortion, astigmatism, curvature of field, and the like, which are generated when the incident light passes through the first lens element L1 to the sixth lens element L6, can be corrected, and the imaging requirements of the optical lens 100, such as low aberration and high quality, can be met, and when the image-side surface 72 of the seventh lens element L7 is convex at the paraxial region, the incident light can be made to enter the imaging surface 101 of the optical lens 100 at a more reasonable angle, so as to meet the matching angle requirements of the image sensor, improve the image resolution, and ensure the imaging quality of the optical lens 100. Meanwhile, at least one of the first lens L1 to the seventh lens L7 of the optical lens 100 is set to be a non-rotational symmetry plane type, so that the design freedom of the refractive curved surface of the optical lens 100 is increased, and the midfield curvature and the sagittal curvature are effectively corrected, thereby suppressing aberrations such as astigmatism and distortion of the optical lens 100 and improving the imaging quality of the optical lens 100.
In some embodiments, a surface of at least one of the first lens L1, 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 is a non-rotationally symmetrical surface type. That is, the object-side surface or the image-side surface of at least one lens is a non-rotational symmetry surface type, and by using the lens of the non-rotational symmetry surface type, the design freedom of the lens can be improved, which is beneficial to realize the final correction of the meridional field curvature and the sagittal field curvature of the optical lens 100, thereby effectively suppressing aberrations such as field curvature, astigmatism, distortion and the like of the optical lens 100, and being beneficial to improving the imaging quality of the optical lens 100.
In some embodiments, the first lens L1, 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 may all be made of glass, so that the influence of temperature on each lens of the optical lens 100 may be reduced, and the optical lens 100 is ensured to have a good optical effect. When the optical lens 100 is applicable to electronic devices such as smart phones and smart tablets, the first lens L1, 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 may be made of plastic, so that the optical lens has a good optical effect, has good portability, and is easier to process a lens with a complex surface.
In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 may be an aperture stop 102 and/or a field stop 102, which may be disposed between the image-side surface 22 of the second lens L2 and the object-side surface 31 of the third lens L3 of the optical lens 100. It is understood that, in other embodiments, the diaphragm 102 may be disposed between other lenses, and the arrangement is adjusted according to the actual situation, and the embodiment is not particularly limited.
In some embodiments, the optical lens 100 further includes an infrared filter 80, and the infrared filter 80 is disposed between the seventh lens element L7 and the image plane 101 of the optical lens 100. The infrared filter 80 is selected for use, infrared light is filtered, imaging quality is improved, and imaging is more in line with visual experience of human eyes. It is understood that the infrared filter 80 may be made of an optical glass coating, a colored glass, or an infrared filter 80 made of other materials, which may be selected according to actual needs, and is not specifically limited in this embodiment.
In some embodiments, the optical lens 100 satisfies the following relationship: 36 ° < (FOV/TTL) × f <45.5 °; wherein, the FOV is the maximum field angle of the optical lens 100, TTL is the distance from the object-side surface 11 of the first lens element L1 to the image plane 101 of the optical lens 100 on the optical axis O, and f is the effective focal length of the optical lens 100. When the optical lens 100 satisfies the above relation, the optical lens 100 can satisfy the requirements of miniaturization and lightness, and maintain the characteristic of a large field angle, so as to ensure the imaging quality of the optical lens 100. When the value is higher than the upper limit, the size of the optical lens 100 is greatly affected, which is not favorable for realizing the design requirements of lightness, thinness and miniaturization of the optical lens 100, so that the optical lens 100 cannot meet the design requirements of large image surface and small size; when the value is lower than the lower limit, the work difficulty of sensitivity reduction and optimization of each lens surface type in the optical lens 100 is increased, which increases the design difficulty and the manufacturing difficulty of the optical lens 100, and further deteriorates the manufacturability of the optical lens 100.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.75< SD11/SD72< 0.9; SD11 is the maximum effective half aperture of the object-side surface 11 of the first lens L1, and SD72 is the maximum effective half aperture of the image-side surface 72 of the seventh lens L7. As the first lens and the last lens from the object side of the optical lens 100, the ratio of the effective half aperture of the object-side surface 11 of the first lens L1 to the effective half aperture of the image-side surface 72 of the seventh lens L7 can reflect the aperture size of the head and the bottom of the lens barrel adapted to the optical lens 100, and when the above relation is satisfied, the ratio can be controlled within a reasonable range, and the aperture of the first lens L1 is smaller than the aperture of the seventh lens L7, so that the design of the lens barrel head of the optical lens 100 is more miniaturized, and further the market demand for the wide-angle small-head lens is satisfied. When the ratio is higher than the upper limit, the aperture of the first lens L1 is too large, which results in an oversized head of the optical lens 100, and is not favorable for the design requirement of the small head of the optical lens 100; when the ratio is lower than the lower limit, the surface thickness of the first lens L1 reaches the limit, so that the difficulty in designing and processing the surface of the first lens L1 is increased, and the effect of the first lens L1 on balancing aberration is reduced, which further reduces the control of the optical lens 100 on aberration, and is not favorable for improving the imaging quality of the optical lens 100.
In some embodiments, optical lens 100 satisfies the following relationship: 0.3< (CT12+ CT23)/CT1< 0.8; the CT12 is a distance between the image-side surface 12 of the first lens element L1 and the object-side surface 21 of the second lens element L2 along the optical axis O, the CT23 is a distance between the image-side surface 22 of the second lens element L2 and the object-side surface 31 of the third lens element L3 along the optical axis O, and the CT1 is a distance between the object-side surface 11 of the first lens element L1 and the image-side surface 12 of the first lens element L1 along the optical axis O. When the above relational expression is satisfied, it is possible to avoid the problem that the process of processing, assembling, etc. of the optical lens 100 is difficult due to the excessively small gaps between the first lens L1 and the second lens L2 and between the second lens L2 and the third lens L3, and at the same time, by controlling the gaps between the lenses, it is possible to reduce the total length of the optical lens 100, so as to satisfy the design requirements of miniaturization and lightness of the optical lens 100. Further, when the ratio of the above relational expressions is controlled within the above range and is as close to the lower limit value as possible, the thicknesses of the first lens L1 and the second lens L2 can be reduced, and the distances between the first lens L1 and the second lens L2 and the stop 102 can be reduced, so that the apertures of the first lens L1 and the second lens L2 can be reduced to meet the small head design requirement of the optical lens 100.
In some embodiments, optical lens 100 satisfies the following relationship: 0.25< (CT45+ CT56+ CT67)/BF < 0.6; the CT45 is a distance between the image-side surface 42 of the fourth lens element L4 and the object-side surface 51 of the fifth lens element L5 along the optical axis O, the CT56 is a distance between the image-side surface 52 of the fifth lens element L5 and the object-side surface 61 of the sixth lens element L6 along the optical axis O, the CT67 is a distance between the image-side surface 62 of the sixth lens element L6 and the object-side surface 71 of the seventh lens element L7 along the optical axis O, and the BF is a shortest distance between the image-side surface 72 of the seventh lens element L7 and the image plane 101 of the optical lens assembly 100 along the optical axis O. When the optical lens 100 satisfies the above relation, the size of the gap between the lenses and the back focus can be effectively controlled, and the structural compactness of the optical lens 100 is further maintained, so as to meet the miniaturization design requirement of the optical lens 100, and meanwhile, the back focus is controlled within a proper range, so that the gap between the optical lens 100 and the image sensor of the camera module is more reasonable when the optical lens 100 is applied to the camera module, and the assembly difficulty of the optical lens 100 is reduced. When the value of the above relation is higher than the upper limit, the compactness between the lenses of the optical lens 100 is reduced, and the back focus of the optical lens 100 is shortened, which hinders the design requirements of the optical lens 100 for being light, thin and small.
In some embodiments, optical lens 100 satisfies the following relationship: i (SAXY 11-SAGD 11)/(SAXY 11+ SAGD 11) | < 0.0055; SAGY11 is a distance on the optical axis O between a projection of an edge of the optically effective area of the object-side surface 11 of the first lens L1 in the Y direction on the optical axis O and an intersection point of the object-side surface 11 of the first lens L1 and the optical axis O, and SAGX11 is a distance on the optical axis O between a projection of an edge of the optically effective area of the object-side surface 11 of the first lens L1 in the X direction on the optical axis O and an intersection point of the object-side surface 11 of the first lens L1 and the optical axis O. The X direction is perpendicular to the optical axis O, and the Y direction is perpendicular to both the X direction and the optical axis O. When the first lens element L1 uses the symmetry coefficient of the non-rotationally symmetric surface type, the degree of freedom and the aberration constraint of the optical lens 100 can be optimized, and the optical lens element is in line with the current trend of lens processing capability and has high practicability. When the first lens element L1 is designed to satisfy the above-mentioned relational expression, the first lens element L1 has a small refractive power, and the features of the XY non-rotationally symmetric curved surface of the first lens element L1 can increase the aperture of the optical lens 100 and correct the peripheral field aberration, and the surface shape of the first lens element L1 can be changed slowly to provide good workability.
In some embodiments, optical lens 100 satisfies the following relationship: 1.0< CT3/ET3< 2.2; CT3 is the distance between the object-side surface 31 of the third lens element L3 and the image-side surface 32 of the third lens element L3 along the optical axis O, i.e., the center thickness of the third lens element L3, and ET3 is the distance between the maximum effective half aperture of the object-side surface 31 of the third lens element L3 and the maximum effective half aperture of the image-side surface 32 of the third lens element L3 along the optical axis O, i.e., the edge thickness of the third lens element L3. By controlling the ratio of the center thickness to the edge thickness of the third lens element L3 in the above range, the amount of refractive power of the third lens element L3 can be controlled, the surface form inclination angle of the third lens element L3 can be reduced, and the refractive power balance between the lens elements of the optical lens system 100 can be achieved to balance the aberrations contributed by the lens elements.
In some embodiments, optical lens 100 satisfies the following relationship: 1.5< | R52/R62| < 15; wherein R52 is the radius of curvature of the image-side surface 52 of the fifth lens element L5 along the optical axis O, and R62 is the radius of curvature of the image-side surface 62 of the sixth lens element L6 along the optical axis O. When the optical lens 100 satisfies the above relation, the surface shapes of the fifth lens L5 and the sixth lens L6 are relatively smooth, that is, the surfaces of the lenses have a shape with less sag, so as to reduce the difficulty in processing and manufacturing the lenses, and further reduce the manufacturing cost of the optical lens 100. Meanwhile, due to the limitation of the above relation, the defects of curvature and distortion of the imaging surface 101 of the optical lens 100 can be corrected better, and the condition of serious ghost image caused by multiple reflections of the light rays in the lens due to the low-angle incidence of the incident light rays can be avoided.
In some embodiments, optical lens 100 satisfies the following relationship: 0.5< (SD72-SD71)/ET7< 0.75; where SD72 is the maximum effective half aperture of the image-side surface 72 of the seventh lens L7, SD71 is the maximum effective half aperture of the object-side surface 71 of the seventh lens L7, and ET7 is the distance along the optical axis O from the maximum effective half aperture of the object-side surface 71 of the seventh lens L7 to the maximum effective half aperture of the image-side surface 72 of the seventh lens L7. Because the effective aperture of the seventh lens L7 is determined by the edge of the seventh lens L7 through which the maximum field of view light passes, and the above-mentioned relation is limited, the inclination degree of the maximum field of view light is reflected, when the value of the effective aperture meets the above-mentioned range, the maximum marginal field of view light can keep a reasonable inclination angle when passing through the seventh lens L7, and then the chief ray thereof is constrained within a reasonable range, so as to avoid the condition that the angle of incidence of the field of view on the imaging surface 101 of the optical lens 100 is too large due to the too large inclination angle of the marginal light, ensure that the incident light can be smoothly incident to the image sensor of the camera module, and reduce the difficulty in adapting the image sensor of the optical lens 100 and the camera module.
The optical lens 100 of the present embodiment will be described in detail with reference to specific parameters.
First embodiment
A schematic structural diagram of an optical lens 100 disclosed in the first embodiment of the present application is shown in fig. 1, where the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an infrared filter 80, which are disposed in order from an object side to an image side along an optical axis O. The first lens element L1 with negative refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power, the sixth lens element L6 with positive refractive power and the seventh lens element L7 with negative refractive power.
Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are both concave at the paraxial region O, and the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and concave at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex at the paraxial region O, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex at the circumference; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are both concave at the paraxial region O, and the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are both concave at the periphery; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex at the circumference; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are respectively concave and convex at the optical axis O, and the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are both concave at the circumference; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are respectively convex and concave at the optical axis O, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are respectively concave and convex at the circumference.
Specifically, taking as an example that the effective focal length f =1.94mm of the optical lens 100, the aperture value FNO =1.98 of the optical lens 100, the maximum field angle FOV =112.52 ° of the optical lens 100, and the distance TTL =5.94mm on the optical axis O from the object-side surface 11 of the first lens L1 of the optical lens 100 to the imaging surface 101 of the optical lens 100, other parameters of the optical lens 100 are given in table 1 below. The elements of the optical lens 100 from the object side to the image side along the optical axis O are arranged in the order of the elements from top to bottom in table 1. In the same lens, the surface with the smaller surface number is the object side surface of the lens, and the surface with the larger surface number is the image side surface of the lens, and for example, the surface numbers 1 and 2 correspond to the object side surface and the image side surface of the first lens L1, respectively. The radius Y in table 1 is the radius of curvature of the object-side surface or the image-side surface of the corresponding surface number at the optical axis O. The first value in the "thickness" parameter list of a lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis O. The numerical value of the stop 102 in the "thickness" parameter column is the distance on the optical axis O from the stop 102 to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis O), the direction from the object side to the image side of the last lens of the first lens L1 is the positive direction of the optical axis O, when the value is negative, it indicates that the stop 102 is disposed on the right side of the vertex of the next surface, and if the thickness of the stop 102 is a positive value, the stop 102 is disposed on the left side of the vertex of the next surface. It is understood that the units of the radius Y, thickness, and focal length in table 1 are all mm. And the refractive index, Abbe number, focal length, etc. in Table 1 were obtained at a reference wavelength of 587 nm.
In the first embodiment, the image-side surface 11 of the first lens L1 and any one of the second lens L2 through the seventh lens L7 have aspheric object-side and image-side surfaces, and the profile x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:
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wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis O direction; c is the curvature at the optical axis O, c 1/Y (i.e., paraxial curvature c is the inverse of the radius of curvature Y in table 1 above); k is the cone coefficient; ai is a correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the first embodiment.
In the first embodiment, the object-side surface 11 of the first lens L1 is a non-rotational-symmetry surface type, i.e., a free-form surface, and when the object-side surface 11 of the first lens L1 is set to be the non-rotational-symmetry surface type, the first lens L1 can reduce the deflection angle of the marginal field ray passing through the first lens L1 by making full use of the characteristic of the non-rotational-symmetry surface type of freedom, so as to reduce the high-order aberration and further achieve the aberration balance of the optical lens 100. The profile z of a free-form lens can be defined using, but not limited to, the following free-form equation:
Figure 284935DEST_PATH_IMAGE002
where k is a conic constant (c) and c is a curvature at the optical axis O, c is 1/Y (i.e., paraxial curvature c is an inverse of curvature radius Y in table 1 above), r is a distance between a point on the free-form surface and the optical axis O, x is an x-direction component of r, Y is a Y-direction component of r, P is a curvature radius of the optical axis O, and c is a radius of curvature of the free-form surfacejIs the free form surface coefficient; ei(X, Y) is a monomial of X-axis coordinates and Y-axis coordinates. Table 3 shows the taper coefficients and P of the free-form surfaces in the first embodimentjThe free-form surface coefficients in both the X and Y directions, e.g., X ^2 corresponds to a free-form surface coefficient P as shown in Table 34Y ^2 corresponds to the coefficient of the free-form surface is P6And X ^4 corresponds to the coefficient of the free-form surface P11And the coefficient of the free-form surface corresponding to X2Y 2 is P13Y ^4 corresponds to the coefficient of the free-form surface is P15X ^6 corresponds to the coefficient of the free-form surface being P22And the coefficient of the free-form surface corresponding to X4Y 2 is P24Y ^6 corresponds to the coefficient of the free-form surface is P28And X ^8 corresponds to the coefficient of the free-form surface being P37And the coefficient of the free-form surface corresponding to X6Y 2 is P39The coefficient of the free-form surface corresponding to X4Y 4 is P41 ，The coefficient of the free-form surface corresponding to X2Y 6 is P43Y ^8 corresponds to the coefficient of the free-form surface is P45X ^10 corresponds to the coefficient of the free-form surface being P56 ，The coefficient of the free-form surface corresponding to X8Y 2 is P58 ，The coefficient of the free-form surface corresponding to X6Y 4 is P60 ，The coefficient of the free-form surface corresponding to X ^ 4X Y ^6 is P62And the coefficient of the free-form surface corresponding to X2Y 8 is P64 ，Y ^10 corresponds to the coefficient of the free-form surface is P66。
TABLE 1
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TABLE 2
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TABLE 3
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Referring to fig. 2 (a), fig. 2 (a) shows a light spherical aberration curve of the optical lens 100 in the first embodiment at 486.1nm, 587.0nm and 656.3 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.
Referring to fig. 2 (B), fig. 2 (B) is a diagram of astigmatism of light of the optical lens 100 in the first embodiment at a wavelength of 587.0 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves represent a meridional image plane 101 curvature T and a sagittal image plane 101 curvature S, and as can be seen from (B) in fig. 2, astigmatism of the optical lens 100 is well compensated at this wavelength.
Referring to fig. 2 (C), fig. 2 (C) is a distortion curve diagram of the optical lens 100 in the first embodiment at a wavelength of 587.0 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height in mm. As can be seen from (C) in fig. 2, the distortion of the optical lens 100 is well corrected at the wavelength 587.6 nm.
Referring to fig. 3, fig. 3 shows the size of the RMS (root-mean-square) spot diameter of the optical lens 100 of the first embodiment at different image height positions, i.e. the relationship between the RMS spot diameter and the real light image height. In FIG. 3, the minimum RMS spot diameter is 0.001159mm, the maximum RMS spot diameter is 0.011787mm, the mean RMS spot diameter is 0.0017665mm, and the standard deviation of the RMS spot diameter is 0.00030626 mm. As can be seen from fig. 3, the optical lens 100 of the first embodiment can achieve good imaging quality.
Second embodiment
A schematic structural diagram of an optical lens 100 disclosed in the second embodiment of the present application is shown in fig. 4, where the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an infrared filter 80, which are disposed in order from an object side to an image side along an optical axis O. The first lens element L1 with negative refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive refractive power and the seventh lens element L7 with negative refractive power.
Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are both concave at the paraxial region O, and the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and concave at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex at the paraxial region O, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex at the circumference; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are both concave at the paraxial region O, and the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are both concave at the periphery; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are both concave at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are both convex at the circumference; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are respectively concave and convex at the optical axis O, and the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are respectively concave and convex at the circumference; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are respectively convex and concave at the optical axis O, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are respectively concave and convex at the circumference.
Specifically, taking as an example that the effective focal length f =1.94mm of the optical lens 100, the aperture value FNO =1.89 of the optical lens 100, the maximum field angle FOV =113.91 ° of the optical lens 100, and the distance TTL =5.39mm on the optical axis O from the object-side surface 11 of the first lens L1 of the optical lens 100 to the imaging surface 101 of the optical lens 100, other parameters of the optical lens 100 are given in table 4 below. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 4 are mm. And the reference wavelength of focal length, refractive index, abbe number of each lens in table 4 is 587 nm. In the second embodiment, table 5 gives the high-order term coefficients that can be used for each aspherical mirror surface in the second embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment. In the second embodiment, the object side surface 11 of the first lens L1 is of a non-rotationally symmetrical surface type, that is, a free-form surface, and table 6 gives coefficients that can be used for each free-form surface in the second embodiment, where the free-form surface formula can be defined by the formula given in the first embodiment, and the correspondence relationship between the coefficients of each free-form surface and X, Y in table 6 can be described with reference to the first embodiment described above.
TABLE 4
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TABLE 5
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TABLE 6
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Referring to fig. 5, as shown in the (a) spherical aberration diagram, the (B) astigmatism diagram and the (C) distortion diagram of fig. 5, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 5 (a), fig. 5 (B), and fig. 5 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.
Referring to fig. 6, fig. 6 shows the size of the RMS (root-mean-square) spot diameter of the optical lens 100 of the second embodiment at different image height positions, i.e. the relationship between the RMS spot diameter and the real light image height. In FIG. 6, the minimum RMS spot diameter is 0.0011606mm, the maximum RMS spot diameter is 0.0050604mm, the mean RMS spot diameter is 0.0024381mm, and the standard deviation of the RMS spot diameter is 0.00086517 mm. As can be seen from fig. 6, the optical lens 100 of the second embodiment can achieve good imaging quality.
Third embodiment
A schematic structural diagram of an optical lens 100 disclosed in the third embodiment of the present application is shown in fig. 7, where the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an infrared filter 80, which are disposed in order from an object side to an image side along an optical axis O. The first lens element L1 with negative refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive refractive power and the seventh lens element L7 with negative refractive power.
Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are both concave at the paraxial region O, and the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and concave at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are respectively convex and concave at the paraxial region O, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are respectively convex and concave at the circumference; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the paraxial region O, and the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the circumference; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are both concave at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are both concave at the circumference; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are convex on the optical axis O, and the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are convex on the circumference; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are respectively convex and concave at the optical axis O, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are respectively concave and convex at the circumference.
Specifically, taking as an example that the effective focal length f =1.94mm of the optical lens 100, the aperture f of the optical lens 100 is =2.00, the maximum field angle FOV =115.77 ° of the optical lens 100, and the distance TTL =4.98mm on the optical axis O from the object-side surface 11 of the first lens L1 of the optical lens 100 to the imaging surface 101 of the optical lens 100, other parameters of the optical lens 100 are given in table 7 below. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 7 are mm. And the reference wavelength of focal length, refractive index, abbe number of each lens in table 7 was 587 nm. In the third embodiment, table 8 gives the high-order term coefficients that can be used for each aspherical mirror surface in the third embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment. In the third embodiment, the object side surface 11 of the first lens L1 is of a non-rotationally symmetrical surface type, that is, a free-form surface, and table 9 gives coefficients that can be used for each free-form surface in the third embodiment, where the free-form surface formula can be defined by the formula given in the first embodiment, and the correspondence relationship between the coefficients of each free-form surface and X, Y in table 9 can be described with reference to the first embodiment described above.
TABLE 7
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TABLE 8
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TABLE 9
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Referring to fig. 8, as can be seen from the (a) spherical aberration diagram, the (B) astigmatism diagram and the (C) distortion diagram in fig. 8, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 8 (a), fig. 8 (B), and fig. 8 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.
Referring to fig. 9, fig. 9 shows the size of the RMS (root-mean-square) spot diameter of the optical lens 100 of the third embodiment at different image height positions, i.e. the relationship between the RMS spot diameter and the real light image height. In FIG. 9, the minimum RMS spot diameter is 0.00096193mm, the maximum RMS spot diameter is 0.0075134mm, the mean RMS spot diameter is 0.0031417mm, and the standard deviation of the RMS spot diameter is 0.0010184 mm. As can be seen from fig. 9, the optical lens 100 of the third embodiment can achieve good imaging quality.
Fourth embodiment
A schematic structural diagram of an optical lens 100 disclosed in the fourth embodiment of the present application is shown in fig. 10, where the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an infrared filter 80, which are disposed in order from an object side to an image side along an optical axis O. The first lens element L1 with negative refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive refractive power and the seventh lens element L7 with negative refractive power.
Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are both concave at the paraxial region O, and the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and concave at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are both concave at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex at the paraxial region O, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex at the circumference; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the paraxial region O, and the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the circumference; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are both concave at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are both concave at the circumference; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are respectively concave and convex at the optical axis O, and the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are respectively convex and concave at the circumference; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are respectively convex and concave at the optical axis O, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are respectively concave and convex at the circumference.
Specifically, taking as an example that the effective focal length f =2.09mm of the optical lens 100, the aperture f of the optical lens 100 =2.00, the maximum field angle FOV =109.37 ° of the optical lens 100, and the distance TTL =5.06mm on the optical axis O from the object-side surface 11 of the first lens L1 of the optical lens 100 to the imaging surface 101 of the optical lens 100, other parameters of the optical lens 100 are given in the following table 10. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 10 are mm. And the reference wavelength of focal length, refractive index, abbe number of each lens in table 10 is 587 nm. In the fourth embodiment, table 11 gives the high-order term coefficients that can be used for each aspherical mirror surface in the fourth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment. In the fourth embodiment, the object side surface 11 of the first lens L1 is of a non-rotationally symmetrical surface type, that is, a free-form surface, and table 12 gives coefficients that can be used for each free-form surface in the fourth embodiment, where the free-form surface formula can be defined by the formula given in the first embodiment, and the correspondence relationship between the coefficients of each free-form surface and X, Y in table 12 can be described with reference to the first embodiment described above.
Watch 10
Figure 219579DEST_PATH_IMAGE012
TABLE 11
Figure 983136DEST_PATH_IMAGE013
TABLE 12
Figure 82679DEST_PATH_IMAGE014
Referring to fig. 11, as can be seen from the (a) spherical aberration diagram, the (B) astigmatism diagram and the (C) distortion diagram of fig. 11, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 11 (a), fig. 11 (B), and fig. 11 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.
Referring to fig. 12, fig. 12 shows the size of the RMS (root-mean-square) spot diameter of the optical lens 100 of the fourth embodiment at different image height positions, i.e. the relationship between the RMS spot diameter and the real light image height. In FIG. 12, the minimum RMS spot diameter is 0.0011524mm, the maximum RMS spot diameter is 0.018046mm, the mean RMS spot diameter is 0.003171mm, and the standard deviation of the RMS spot diameter is 0.0020469 mm. As can be seen from fig. 12, the optical lens 100 according to the fourth embodiment can achieve good imaging quality.
Fifth embodiment
A schematic structural diagram of an optical lens 100 disclosed in the fifth embodiment of the present application is shown in fig. 13, where the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an infrared filter 80, which are disposed in order from an object side to an image side along an optical axis O. The first lens element L1 with negative refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive refractive power and the seventh lens element L7 with positive refractive power.
Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are both concave at the paraxial region O, and the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and concave at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are both convex at the paraxial region O, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are respectively convex and concave at the circumference; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the paraxial region O, and the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the circumference; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are both concave at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are respectively concave and convex at the circumference; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are respectively concave and convex at the optical axis O, and the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are respectively concave and convex at the circumference; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are respectively convex and concave at the optical axis O, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are respectively concave and convex at the circumference.
Specifically, taking as an example that the effective focal length f =1.93mm of the optical lens 100, the aperture f of the optical lens 100 is =2.00, the maximum field angle FOV =111.13 ° of the optical lens 100, and the distance TTL =4.91mm on the optical axis O from the object-side surface 11 of the first lens L1 of the optical lens 100 to the imaging surface 101 of the optical lens 100, the other parameters of the optical lens 100 are given by the following table 13. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 13 are mm. And the reference wavelength of focal length, refractive index, abbe number of each lens in table 13 is 587 nm. In the fifth embodiment, table 14 gives the high-order term coefficients that can be used for each aspherical mirror surface in the fifth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment. In the fifth embodiment, the object side surface 11 of the first lens L1 is of a non-rotationally symmetrical surface type, that is, a free-form surface, and table 15 gives coefficients that can be used for each free-form surface in the fifth embodiment, where the free-form surface formula can be defined by the formula given in the first embodiment, and the correspondence relationship between the coefficients of each free-form surface and X, Y in table 15 can be described with reference to the first embodiment described above.
Watch 13
Figure 298896DEST_PATH_IMAGE015
TABLE 14
Figure 384664DEST_PATH_IMAGE016
Watch 15
Figure 2727DEST_PATH_IMAGE017
Referring to fig. 14, as can be seen from the (a) spherical aberration diagram, the (B) astigmatism diagram and the (C) distortion diagram in fig. 14, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 14 (a), fig. 14 (B), and fig. 14 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.
Referring to fig. 15, fig. 15 shows the size of the RMS (root-mean-square) spot diameter of the optical lens 100 of the fifth embodiment at different image height positions, i.e. the relationship between the RMS spot diameter and the real light image height. In FIG. 15, the minimum RMS spot diameter is 0.0011774mm, the maximum RMS spot diameter is 0.009445mm, the mean RMS spot diameter is 0.0035811mm, and the standard deviation of the RMS spot diameter is 0.0016506 mm. As can be seen from fig. 15, the optical lens 100 according to the fifth embodiment can achieve good imaging quality.
Sixth embodiment
A schematic structural diagram of an optical lens 100 disclosed in the sixth embodiment of the present application is shown in fig. 16, where the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an infrared filter 80, which are disposed in order from an object side to an image side along an optical axis O. The first lens element L1 with negative refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with positive refractive power, the sixth lens element L6 with negative refractive power and the seventh lens element L7 with positive refractive power.
Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are both concave at the paraxial region O, and the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and concave at the circumference; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the circumference; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are both convex at the paraxial region O, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the circumference, respectively; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex and concave at the paraxial region O, respectively, and the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex and concave at the circumference, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at the paraxial region O, respectively, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex at the circumference; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are both concave at the optical axis O, and the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are both concave at the circumference; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are respectively convex and concave at the optical axis O, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are both convex at the circumference.
Specifically, taking as an example that the effective focal length f =1.56mm of the optical lens 100, the aperture value FNO =2.05 of the optical lens 100, the maximum field angle FOV =125.29 ° of the optical lens 100, and the distance TTL =5.11mm on the optical axis O from the object-side surface 11 of the first lens L1 of the optical lens 100 to the imaging surface 101 of the optical lens 100, other parameters of the optical lens 100 are given in the following table 16. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 16 are mm. And the reference wavelength of focal length, refractive index, abbe number of each lens in table 16 was 587 nm. In the sixth embodiment, table 17 gives the high-order term coefficients that can be used for each aspherical mirror surface in the sixth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment. In the sixth embodiment, the image-side surface 12 of the first lens element L1 is a non-rotational-symmetric surface type, i.e., a free-form surface, when the image-side surface 12 of the first lens element L1 is configured as a non-rotational-symmetric surface type, the first lens element L1 can reduce the deflection angle of the marginal field ray passing through the first lens element L1 by making full use of the characteristic of the non-rotational-symmetric surface type of freedom, so as to reduce the high-order aberration, and further achieve the aberration balance of the optical lens 100. Table 18 gives coefficients that can be used for each free-form surface in the sixth embodiment, wherein the free-form surface formula can be defined by the formula given in the first embodiment, and the correspondence relationship between the coefficients of each free-form surface in table 18 and X, Y can be described with reference to the first embodiment described above.
TABLE 16
Figure 538751DEST_PATH_IMAGE018
TABLE 17
Figure 179948DEST_PATH_IMAGE019
Watch 18
Figure 866144DEST_PATH_IMAGE020
Referring to fig. 17, as can be seen from the (a) spherical aberration diagram, the (B) astigmatism diagram and the (C) distortion diagram in fig. 17, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 17 (a), fig. 17 (B), and fig. 17 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.
Referring to fig. 18, fig. 18 shows the size of the RMS (root-mean-square) spot diameter of the optical lens 100 of the sixth embodiment at different image height positions, i.e. the relationship between the RMS spot diameter and the real light image height. In FIG. 18, the minimum RMS spot diameter is 0.0010066mm, the maximum RMS spot diameter is 0.0087999mm, the mean RMS spot diameter is 0.0045716mm, and the standard deviation of the RMS spot diameter is 0.0014504 mm. As can be seen from fig. 18, the optical lens 100 according to the sixth embodiment can achieve good imaging quality.
Referring to table 19, table 19 summarizes ratios of the relations in the first embodiment to the sixth embodiment of the present application.
Watch 19
Figure 657821DEST_PATH_IMAGE021
Referring to fig. 19, the present application further discloses a camera module 200, wherein the camera module 200 includes an image sensor 201 and the optical lens 100 according to any of the first to sixth embodiments of the above-mentioned first aspect, and the image sensor 201 is disposed at an image side of the optical lens 100. The optical lens 100 is configured to receive an optical signal of a subject and project the optical signal to the image sensor 201, and the image sensor 201 is configured to convert the optical signal corresponding to the subject into an image signal, which is not described herein again. It can be understood that the camera module 200 having the optical lens 100 has all the technical effects of the optical lens 100, that is, the camera module 200 can meet the requirements of miniaturization, light weight, and large field angle, and can realize high-quality imaging. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.
Referring to fig. 20, the present application further discloses an electronic device 300, wherein the electronic device 300 includes a housing and the camera module 200, and the camera module 200 is disposed in the housing. The electronic device 300 may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, and the like. It can be understood that the electronic device 300 having the camera module 200 also has all the technical effects of the optical lens 100. That is, the electronic device 300 can realize a large field angle and high-quality imaging while satisfying miniaturization, light weight, and weight. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.
The optical lens, the camera module and the electronic device disclosed in the embodiments of the present invention are described in detail above, and the principle and the embodiments of the present invention are explained in detail herein by applying specific examples, and the description of the embodiments above is only used to help understanding the optical lens, the camera module and the electronic device and the core ideas thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (8)

1. An optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in order from an object side to an image side along an optical axis;
the first lens element with negative refractive power has a concave object-side surface at paraxial region;
the second lens element with refractive power has a concave image-side surface at paraxial region;
the third lens element with refractive power has a convex object-side surface at paraxial region;
the fourth lens element with refractive power;
the fifth lens element with refractive power;
the sixth lens element with refractive power;
the seventh lens element with refractive power has a convex object-side surface at paraxial region;
at least one surface of the first lens to the seventh lens is a non-rotational-symmetry surface type;
the lens with refractive power of the optical lens is the seven lens;
the optical lens satisfies the following relation:
36°<（FOV/TTL）*f<45.5°；
0.75<SD11/SD72<0.9；
0.5<(SD72-SD71)/ET7<0.75；
wherein, the FOV is a maximum field angle of the optical lens, the TTL is a distance on the optical axis from the object-side surface of the first lens element to the image plane of the optical lens, f is an effective focal length of the optical lens, SD11 is a maximum effective half aperture of the object-side surface of the first lens element, SD72 is a maximum effective half aperture of the image-side surface of the seventh lens element, SD71 is a maximum effective half aperture of the object-side surface of the seventh lens element, and ET7 is a distance in the optical axis direction from a position of the maximum effective half aperture of the object-side surface of the seventh lens element to a position of the maximum effective half aperture of the image-side surface of the seventh lens element.
2. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
0.3<(CT12+CT23)/CT1<0.8；
wherein CT12 is a distance on the optical axis from the image-side surface of the first lens element to the object-side surface of the second lens element, CT23 is a distance on the optical axis from the image-side surface of the second lens element to the object-side surface of the third lens element, and CT1 is a distance on the optical axis from the object-side surface of the first lens element to the image-side surface of the first lens element.
3. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
0.25<(CT45+CT56+CT67)/BF<0.6；
wherein CT45 is a distance between an image-side surface of the fourth lens element and an object-side surface of the fifth lens element on the optical axis, CT56 is a distance between the image-side surface of the fifth lens element and an object-side surface of the sixth lens element on the optical axis, CT67 is a distance between the image-side surface of the sixth lens element and an object-side surface of the seventh lens element on the optical axis, and BF is a shortest distance between the image-side surface of the seventh lens element and an image plane of the optical lens element along the optical axis.
4. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
|(SAGY11-SAGX11)/(SAGY11+SAGX11)|<0.0055；
SAGY11 is a distance on the optical axis between a projection of an edge of an optically effective area of an object side surface of the first lens in the Y direction on the optical axis and an intersection point of the object side surface of the first lens and the optical axis, and SAGX11 is a distance on the optical axis between a projection of an edge of an optically effective area of an object side surface of the first lens in the X direction on the optical axis and an intersection point of the object side surface of the first lens and the optical axis.
5. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
1.0<CT3/ET3<2.2；
wherein CT3 is a distance on the optical axis from the object-side surface of the third lens element to the image-side surface of the third lens element, and ET3 is a distance on the optical axis from the maximum effective semi-aperture of the object-side surface of the third lens element to the maximum effective semi-aperture of the image-side surface of the third lens element.
6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
1.5<|R52/R62|<15；
wherein R52 is a radius of curvature of an image-side surface of the fifth lens element at the optical axis, and R62 is a radius of curvature of an image-side surface of the sixth lens element at the optical axis.
7. A camera module, characterized in that the camera module comprises an image sensor and an optical lens according to any one of claims 1-6, wherein the image sensor is arranged on the image side of the optical lens.
8. An electronic device comprising a housing and the camera module of claim 7, wherein the camera module is disposed on the housing.
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