CN114740605B - Optical lens, camera module and electronic equipment - Google Patents

Optical lens, camera module and electronic equipment Download PDF

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Publication number
CN114740605B
CN114740605B CN202210483070.1A CN202210483070A CN114740605B CN 114740605 B CN114740605 B CN 114740605B CN 202210483070 A CN202210483070 A CN 202210483070A CN 114740605 B CN114740605 B CN 114740605B
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lens
lens element
optical
optical lens
paraxial region
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CN114740605A (en
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龙鑫灿
李明
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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
    • 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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention discloses an optical lens, an image pickup module and electronic equipment, wherein the optical lens has seven lenses with refractive power, and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens are sequentially arranged from an object side to an image side along an optical axis; the first lens element with negative refractive power, the second lens element with negative refractive power, the third lens element with positive refractive power, the fourth lens element with positive refractive power, the fifth lens element with negative refractive power, the sixth lens element with positive refractive power, the seventh lens element with negative refractive power, the optical lens element satisfying the following relationship: 4.4mm < TTL/TAN (HFOV) <5.7mm, 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 HFOV is half of the maximum field angle of the optical lens. The optical lens, the camera module and the electronic equipment provided by the invention can realize the design of the large visual angle of the optical lens and the design of light, thin and small size.

Description

Optical lens, camera module and electronic equipment
Technical Field
The present invention relates to the field of optical imaging technologies, and in particular, to an optical lens, a camera module, and an electronic device.
Background
In recent years, with the development of technology, portable electronic products with a camera function are more favored. The wide-angle lens has a larger shooting visual field, can shoot a large scene or panoramic photo in a limited distance range, and can meet the requirements of users.
However, with the development of chip technology, the pixel size of the photosensitive chip is smaller and smaller, and the imaging quality requirement on the matched optical lens is higher and higher. In order to ensure imaging quality, the traditional wide-angle camera module enlarges the visual angle range, and meanwhile, the volume of an optical lens of the traditional wide-angle camera module is usually larger, so that the application requirement of light, thin and miniaturized electronic equipment is difficult to meet.
Disclosure of Invention
The invention provides an optical lens, an image pickup module and electronic equipment, which can realize the design of the optical lens with a large visual angle and the design of light, thin and small size.
In order to achieve the above object, according to a first aspect of the present invention, there is disclosed an optical lens comprising seven lens elements with refractive power, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element in this 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 a paraxial region and a concave image-side surface at a paraxial region;
the second lens element with refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the third lens element with refractive power;
the fourth lens element with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
the fifth lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the sixth lens element with positive refractive power; the object side surface of the sixth lens element is concave at a paraxial region, and the image side surface of the sixth lens element is convex at a paraxial region;
the seventh lens element with negative refractive power has a concave image-side surface at a paraxial region;
the optical lens satisfies the following relation:
4.4mm<TTL/TAN(HFOV)<5.7mm；
wherein TTL is the distance between the object side surface of the first lens element and the imaging surface of the optical lens element on the optical axis, i.e. the total optical length, and HFOV is half of the maximum field angle of the optical lens element.
In the optical lens provided by the application, the first lens has negative refractive power, which is beneficial to increasing the angle of view, so that the optical lens forms a configuration with a large viewing angle and can balance aberration generated by compressing the total length of the optical lens; the object side surface of the first lens element is concave at a paraxial region, which is beneficial to enhancing the refractive power of the first lens element and maintaining a smaller total optical length in a large-viewing-angle configuration; the image side surface of the first lens is concave at a paraxial region, so that the angle of light rays entering the second lens from the edge view field can be adjusted conveniently, and the optical total length of the optical lens is compressed; the object side surface of the second lens is convex at the paraxial region, so that the aberration of the optical lens is balanced, and the imaging quality is improved; the image side surface of the second lens is a concave surface at a paraxial region, which is favorable for correcting off-axis aberration of the optical lens; the fourth lens element with positive refractive power has a convex object-side surface and a convex image-side surface at a paraxial region, so that the capability of converging light rays of the optical lens element is concentrated in the second lens element, and the range of light rays entering the optical lens element can be enlarged to enlarge the angle of view; the fifth lens element with negative refractive power has concave object-side and image-side surfaces at paraxial regions, which is beneficial to balancing positive refractive power of the fourth lens element and correcting chromatic aberration of the optical lens element; the sixth lens element with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region, so as to reduce sensitivity and correct astigmatism of the optical lens element and improve imaging quality; the seventh lens element with negative refractive power has a shortest distance between an image side surface of the seventh lens element and an imaging surface in an optical axis direction, so as to balance refractive power distribution of the first lens element to the sixth lens element to reduce aberrations such as spherical aberration and astigmatism, and the concave image side surface of the seventh lens element at a paraxial region can ensure that the optical lens element has reasonable back focus.
That is, by selecting a proper number of lenses and reasonably configuring the refractive power and surface shape of each lens, the optical lens can be ensured to have good surface shape matching degree so as to have a large viewing angle characteristic, and meanwhile, the optical total length of the optical lens can be shortened, so that a light, thin and miniaturized design is realized. And further causing the optical lens to satisfy the following relation: when 4.4mm < TTL/TAN (HFOV) <5.7mm, the total optical length and the maximum field angle of the optical lens can be reasonably configured when the condition is satisfied, the optical lens has a larger field angle, and the optical lens has a smaller total optical length when the requirement of large-scale shooting is satisfied. Exceeding the upper limit of the relation can lead to too small maximum field angle of the optical lens, difficult to meet the characteristics of large field of view, incapable of shooting scenes in a large field of view range, or excessively long total optical length of the optical lens, and lead to excessively large volume of the camera module; when the maximum field angle of the optical lens is lower than the lower limit, the maximum field angle of the optical lens is overlarge, so that the off-axis field distortion is easily caused, the periphery of the imaging surface is distorted, the imaging performance of the optical lens is finally reduced, or the total optical length of the optical lens is too short, the lens arrangement is crowded, and the aberration correction of the optical lens is not facilitated.
As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 3.5< |f1/f+f7/f| <4.3; wherein f1 is an effective focal length of the first lens, f7 is an effective focal length of the seventh lens, and f is an effective focal length of the optical lens. The relation between the effective focal length of the first lens and the seventh lens and the effective focal length of the optical lens is reasonably controlled, so that the excessively strong refractive power of the first lens and the seventh lens can be avoided, the higher-order aberration caused by light rays of the edge view field of the optical lens can be restrained, the resolution of the optical lens can be improved, and the definition of an imaging picture can be further improved. Exceeding the upper limit of the relation, the effective focal length of the optical lens is too small, the depth of field of the optical lens is too shallow, and more depth information of the object space cannot be obtained; and the lower limit of the relation is lower than the lower limit of the relation, the effective focal length of the first lens and the seventh lens is too large, the refractive power of the first lens and the seventh lens is too strong, stronger astigmatism and chromatic aberration are easy to generate, and the imaging quality of the optical lens is reduced.
As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 3.8< TTL/ΣDT <4.4; wherein Σdt is the sum of the air intervals on the optical axis between each two adjacent lenses in the first lens to the seventh lens. The air interval and the total optical length of all the lenses on the optical axis are reasonably configured, so that the light, thin and small optical lenses are realized, and meanwhile, enough air gaps are reserved between the lenses to reduce the assembly difficulty of the lenses and improve the assembly yield of the optical lenses. Exceeding the upper limit of the relation, the optical total length of the optical lens is too large, which is not beneficial to the light, thin and miniaturized optical lens; below the lower limit of the relation, the air space between the first lens and the seventh lens on the optical axis is too small, the lens arrangement is compact, the light deflection space is insufficient, and the aberration is difficult to correct.
As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1< SD72/SD11<1.4; wherein SD11 is half of the maximum effective aperture of the object side surface of the first lens element, and SD72 is half of the maximum effective aperture of the image side surface of the seventh lens element. By reasonably limiting the maximum effective aperture of the object side surface of the first lens and the maximum effective aperture of the image side surface of the seventh lens, light rays of the edge view field can enter the image side surface of the seventh lens from the object side surface of the first lens in a slow change trend, and the risk of distortion of the optical lens is reduced. Exceeding the upper limit of the relation, the maximum effective caliber of the image side surface of the seventh lens is larger, the emergence angle of the principal ray of the edge view field is overlarge, which is not beneficial to correcting aberration, or the maximum effective caliber of the first lens is smaller, the light inlet quantity of the optical lens cannot be ensured, and the relative brightness of the imaging surface is lower; the maximum effective caliber of the seventh lens of the optical lens is too small below the lower limit of the relation, so that the optical lens is difficult to have large image plane characteristics and difficult to match with a large-size photosensitive chip, and the finally assembled camera module is further difficult to realize high-pixel imaging.
As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.5< (SAG41+SAG42)/(SAG 42-SAG 41) <0.8; wherein SAG41 is the sagittal height of the object side surface of the fourth lens element at the maximum effective half-caliber, and SAG42 is the sagittal height of the image side surface of the fourth lens element at the maximum effective half-caliber. The shape of the object side surface and the image side surface of the fourth lens element at the position of the maximum effective half caliber can be effectively controlled by satisfying the relational expression, namely, the surface shape is not excessively bent, the light angle of the edge view field is excessively changed, the assembly sensitivity of the optical lens is large, the surface shape is not excessively flattened, the light deflection capability of the edge view field is weak, and the aberration of the first lens element to the third lens element is difficult to correct.
As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.6< CT3/ET3<1.6; wherein CT3 is the thickness of the third lens element on the optical axis, ET3 is the distance from the maximum effective half-caliber of the object-side surface of the third lens element to the maximum effective half-caliber of the image-side surface of the third lens element in the direction of the optical axis, i.e., the edge thickness. The relation is satisfied, the third lens keeps proper thickness ratio, which is beneficial to the processing and forming of the third lens and reduces the assembling difficulty. The thickness of the third lens on the optical axis is overlarge beyond the upper limit of the relation, which is not beneficial to shortening the total optical length of the optical lens and realizing the light, thin and miniaturized effect; when the thickness of the edge of the third lens is too large, the light converging capability of the third lens is low, the aberration of the first lens in the negative direction cannot be effectively balanced, and the imaging resolving power of the optical lens is reduced.
As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 3.5< FNO. Times. IMGH/f <4.4; wherein FNO is the f-number of the optical lens, IMGH is half of the image height corresponding to the maximum field angle of the optical lens, and f is the effective focal length of the optical lens. The optical lens has a larger aperture to meet the requirements of light flux and longer focal length to meet the depth of field, and can be better combined with a photosensitive chip with larger size to acquire more signals, so that the imaging resolution is improved. Exceeding the upper limit of the relation, the aperture number of the optical lens is too large, and the aperture is too small, so that the phenomenon of dark angle is generated due to insufficient light flux; the lower limit of the relation is lower than the lower limit of the relation, the effective focal length of the optical lens is too large, the depth of field of the optical lens is too shallow, and meanwhile, the image height of the optical lens is too small, so that the optical lens is not beneficial to adapting to a photosensitive chip with larger size and higher pixel, and the imaging quality is affected.
As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -1.4< R51/R52< -1; wherein R51 is a radius of curvature of the object side surface of the fifth lens element at the optical axis, and R52 is a radius of curvature of the image side surface of the fifth lens element at the optical axis. The object side surface and the image side surface of the fifth lens are reasonably configured at the position of the paraxial region, so that the fifth lens is favorable for keeping relatively uniform thickness, and the optical path difference between marginal rays and paraxial rays of the optical lens can be reasonably balanced, thereby reasonably correcting field curvature and astigmatism.
As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -2.5< f5/f4< -2.1; wherein f5 is an effective focal length of the fifth lens, and f4 is an effective focal length of the fourth lens. The relation is satisfied, and the ratio of the effective focal length of the fifth lens to the effective focal length of the fourth lens is controlled, so that the spherical aberration contribution of the fifth lens and the fourth lens is kept within a reasonable range, and the imaging quality of the optical lens in a field area on an optical axis is improved. Exceeding the upper limit of the relation, the refractive power of the fifth lens element relative to the fourth lens element is excessive, so that the fifth lens element and the fourth lens element generate serious astigmatism, which is not beneficial to improving the imaging quality; and the lower limit of the relation is lower than the lower limit of the relation, and the refractive power of the fifth lens element relative to the fourth lens element is too small, so that larger marginal aberration and more serious chromatic aberration are easily generated, and the imaging resolution of the optical lens element is not facilitated to be improved.
In a second aspect, the present invention discloses an image capturing module, where the image capturing module includes a photosensitive chip and the optical lens described in the first aspect, and the photosensitive chip is disposed on an image side of the optical lens. The camera module with the optical lens can realize the design of the optical lens with a large visual angle and simultaneously realize the design of light weight and miniaturization.
In a third aspect, the invention also discloses an electronic device, which comprises a housing and the camera module set in the second aspect, wherein the camera module set is arranged in the housing. The electronic equipment with the camera module can realize the design of the large visual angle of the optical lens and the design of light, thin and small size.
Compared with the prior art, the invention has the beneficial effects that:
according to the optical lens, the camera module and the electronic equipment provided by the embodiment of the invention, seven-piece lenses are adopted in the optical lens, and the refractive power and the surface shape of each lens are reasonably configured by selecting a proper number of lenses, so that the optical lens can be ensured to have good surface shape matching degree to have a large visual angle characteristic, and meanwhile, the optical total length of the optical lens can be shortened, and the light, thin and miniaturized design can be realized. And further causing the optical lens to satisfy the following relation:
when 4.4mm < TTL/TAN (HFOV) <5.7mm, the total optical length and the maximum field angle of the optical lens can be reasonably configured when the condition is satisfied, the optical lens has a larger field angle, and the optical lens has a smaller total optical length when the requirement of large-scale shooting is satisfied. Exceeding the upper limit of the relation can lead to too small maximum field angle of the optical lens, difficult to meet the characteristics of large field of view, incapable of shooting scenes in a large field of view range, or excessively long total optical length of the optical lens, and lead to excessively large volume of the camera module; when the maximum field angle of the optical lens is lower than the lower limit, the maximum field angle of the optical lens is overlarge, so that the off-axis field distortion is easily caused, the periphery of the imaging surface is distorted, the imaging performance of the optical lens is finally reduced, or the total optical length of the optical lens is too short, the lens arrangement is crowded, and the aberration correction of the optical lens is not facilitated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed 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 application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of an optical lens disclosed in a first embodiment of the present application;
fig. 2 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens according to the first embodiment of the present application;
FIG. 3 is a schematic view of an optical lens according to a second embodiment of the present application;
fig. 4 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in a second embodiment of the present application;
FIG. 5 is a schematic view of an optical lens according to a third embodiment of the present application;
fig. 6 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in a third embodiment of the present application;
fig. 7 is a schematic structural view of an optical lens disclosed in a fourth embodiment of the present application;
Fig. 8 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in a fourth embodiment of the present application;
fig. 9 is a schematic structural view of an optical lens disclosed in a fifth embodiment of the present application;
fig. 10 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens disclosed in a fifth embodiment of the present application;
FIG. 11 is a schematic view of a camera module according to the present disclosure;
fig. 12 is a schematic structural view of an electronic device disclosed in the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present invention will be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may 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 meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.
The technical scheme of the application will be further described with reference to the examples and the accompanying drawings.
Referring to fig. 1, the present application provides an optical lens assembly 100 with seven lens elements, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6 and a seventh lens element L7, in order from an object side to an image side along an optical axis O. 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 finally is imaged on the imaging plane IMG of the optical lens 100. The first lens element L1 with negative refractive power, the second lens element L2 and the third lens element L3 with positive or 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 S1 of the first lens element L1 is concave at a paraxial region, and the image side surface S2 of the first lens element L1 is concave at a paraxial region; the object side surface S3 of the second lens element L2 is convex at a paraxial region, and the image side surface S4 of the second lens element L2 is concave at a paraxial region; the object-side surface S5 and the image-side surface S6 of the third lens element L3 can be convex or concave at a paraxial region; the object side surface S7 of the fourth lens element L4 is convex at a paraxial region, and the image side surface S8 of the fourth lens element L4 is convex at a paraxial region; the object side surface S9 of the fifth lens element L5 is concave at a paraxial region, and the image side surface S10 of the fifth lens element L5 is concave at a paraxial region; the object side surface S11 of the sixth lens element L6 is concave at a paraxial region, and the image side surface S12 of the sixth lens element L6 is convex at a paraxial region; the object-side surface S13 of the seventh lens element L7 can be convex or concave, and the image-side surface S14 of the seventh lens element L7 can be concave at a paraxial region.
In the optical lens 100 provided by the present application, the first lens element L1 has negative refractive power, which is helpful for increasing the angle of view, so that the optical lens 100 forms a configuration with a large viewing angle, and can balance the aberration generated by compressing the total optical length; the object side surface S1 of the first lens element L1 is concave at a paraxial region thereof, which is beneficial to enhancing the refractive power of the first lens element L1 and maintaining a smaller overall optical length in a large-viewing-angle configuration; the image side surface S2 of the first lens element L1 is concave at a paraxial region thereof, which is beneficial to adjusting an angle of light entering the second lens element L2 from an edge view field so as to compress an optical total length of the optical lens assembly 100; the object side surface S3 of the second lens element L2 is convex at a paraxial region thereof, which is beneficial to balancing aberration of the optical lens assembly 100 to improve imaging quality; the image side surface S4 of the second lens element L2 is concave at a paraxial region thereof, which is beneficial to correcting off-axis aberration of the optical lens 100; the fourth lens element L4 with positive refractive power has a convex object-side surface and a convex image-side surface at a paraxial region thereof, so as to concentrate the light converging capability of the optical lens element 100 to the second lens element L2, thereby increasing the range of light entering the optical lens element 100 and enlarging the angle of view; the fifth lens element L5 with negative refractive power has concave object-side and image-side surfaces at paraxial regions thereof, which is beneficial to balancing the positive refractive power of the fourth lens element L4 and correcting chromatic aberration of the optical lens assembly 100; the sixth lens element L6 with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region, which is beneficial to reducing sensitivity and correcting astigmatism of the optical lens 100 to improve imaging quality; the seventh lens element L7 with negative refractive power has a shortest distance between the image-side surface S14 of the seventh lens element L7 and the image-plane IMG in the optical axis direction, and thus balances refractive power distribution of the first lens element L1 to the sixth lens element L6 to reduce aberrations such as spherical aberration and astigmatism, and the concave image-side surface S14 of the seventh lens element L7 at a paraxial region can ensure that the optical lens assembly 100 has a reasonable back focus.
In some embodiments, the materials of the lenses in the optical lens 100 may be glass or plastic. The use of a plastic lens can reduce the weight of the optical lens 100 and reduce the production cost. The lens made of glass material provides the optical lens 100 with excellent optical performance and high temperature resistance. It should be noted that the materials of the lenses in the optical lens 100 may be any combination of glass and plastic, and are not necessarily all glass or all plastic. Meanwhile, the object side surfaces and the image side surfaces of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7 are aspheric. The adoption of the aspheric structure can improve the flexibility of lens design, effectively correct spherical aberration and improve imaging quality. In other embodiments, the object side surface and the image side surface of each lens of the optical lens 100 may be spherical. It should be noted that the above embodiments are merely examples of some embodiments of the present application, and in some embodiments, the object side surface and the image side surface of each lens in the optical lens 100 may be an aspherical surface or any combination of spherical surfaces.
It should be noted that the first lens L1 does not mean that there is only one lens, and in some embodiments, there may be two or more lenses in the first lens L1, where the two or more lenses can form a cemented lens, and a surface of the cemented lens closest to the object side may be regarded as the object side surface S1 and a surface closest to the image side may be regarded as the image side surface S2. Alternatively, the first lens L1 does not have a cemented lens, but the distance between the lenses is relatively constant, and the object side surface of the lens closest to the object side is the object side surface S1, and the image side surface of the lens closest to the image side is the image side surface S2. In addition, the number of lenses in the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, or the seventh lens L7 in some embodiments may be greater than or equal to two, and any adjacent lenses may form a cemented lens therebetween or may be a non-cemented lens.
In some embodiments, the optical lens 100 further includes a stop STO, which may be an aperture stop or a field stop, which may be disposed between the image side S6 of the third lens L3 and the object side S7 of the fourth lens L4 of the optical lens 100. It is to be understood that, in other embodiments, the stop STO may be disposed between the object side of the optical lens 100 and the object side S1 of the first lens L1, or between other two adjacent lenses (for example, between the image side S4 of the second lens L2 and the object side S5 of the third lens L3), which is specifically not limited thereto according to the actual situation.
In some embodiments, the optical lens 100 further includes an optical filter L8, where the optical filter L8 may be an infrared cut filter or an infrared band pass filter, and the infrared cut filter is used to filter infrared light, and the infrared band pass filter only allows the infrared light to pass through. In the present application, the filter L8 is an infrared cut filter, and is disposed between the image side of the seventh lens L7 and the imaging plane IMG, and is fixedly disposed relative to each lens in the optical lens 100, so as to prevent infrared light from reaching the imaging plane IMG of the optical lens 100 to interfere with normal imaging. The filter L8 may be assembled with each lens as a part of the optical lens 100, and in other embodiments, the filter L8 may be a separate component from the optical lens 100, and the filter L8 may be mounted between the optical lens 100 and the photosensitive chip when the optical lens 100 is assembled with the photosensitive chip. It is to be understood that the optical filter L8 may be made of an optical glass coating, or may be made of a colored glass, or may be made of another material, and may be selected according to actual needs, which is not specifically limited in this embodiment. In other embodiments, the filtering effect of the infrared light can also be achieved by providing a filtering coating on at least one of the first lens L1 to the seventh lens L7.
In some embodiments, the optical lens 100 satisfies the following relationship: 4.4mm < TTL/TAN (HFOV) <5.7mm; wherein TTL is a distance from the object side surface S1 of the first lens L1 to the imaging surface IMG of the optical lens 100 on the optical axis O, and HFOV is half of a maximum field angle of the optical lens 100. In particular, TTL/TAN (HFOV) may be 4.45, 4.75, 5.05, 5.35, 5.65, etc., in mm.
When the condition is satisfied, the optical total length and the maximum angle of view of the optical lens 100 can be reasonably configured, the optical lens 100 has a larger angle of view, and the optical lens 100 has a smaller optical total length while satisfying the requirement of large-scale shooting. Exceeding the upper limit of the relation results in too small maximum angle of view of the optical lens 100, difficulty in meeting the large field of view characteristic, inability to shoot scenes in a large field of view range, or too long total optical length of the optical lens 100, resulting in too large volume of the camera module; when the maximum field angle of the optical lens 100 is lower than the lower limit, the distortion of the off-axis field is easily caused to be too large, the distortion phenomenon occurs at the periphery of the imaging plane IMG, and finally the imaging performance of the optical lens 100 is reduced, or the total optical length of the optical lens 100 is too short, so that the lens arrangement is crowded, which is unfavorable for the aberration correction of the optical lens 100.
In some embodiments, the optical lens 100 satisfies the following relationship: 3.5< |f1/f+f7/f| <4.3; wherein f1 is an effective focal length of the first lens L1, f7 is an effective focal length of the seventh lens L7, and f is an effective focal length of the optical lens 100. Specifically, |f1/f+f7/f| may be 3.55, 3.73, 3.9, 4.08, 4.25, or the like.
The above relation is satisfied, and by reasonably controlling the relation between the effective focal lengths of the first lens element L1 and the seventh lens element L7 and the effective focal length of the optical lens element 100, the excessive refractive power of the first lens element L1 and the seventh lens element L7 can be avoided, which is beneficial to inhibiting the higher-order aberration caused by the light rays of the marginal field of view of the optical lens element 100, improving the resolution of the optical lens element 100, and further improving the definition of the imaging image. Exceeding the upper limit of the relation, the effective focal length of the optical lens 100 is too small, the depth of field of the optical lens 100 is too shallow, and more depth information of the object space cannot be obtained; below the lower limit of the relationship, the effective focal lengths of the first lens element L1 and the seventh lens element L7 are too large, so that the refractive powers of the first lens element L1 and the seventh lens element L7 are too strong, and stronger astigmatism and chromatic aberration are easily generated, thereby reducing the imaging quality of the optical lens 100.
In some embodiments, the optical lens 100 satisfies the following relationship: 3.8< TTL/ΣDT <4.4; wherein TTL is a distance between the object side surface S1 of the first lens element L1 and the imaging surface IMG of the optical lens 100 on the optical axis O, Σdt is a sum of air spaces between two adjacent lens elements of the first lens element L1 to the seventh lens element L7 on the optical axis O. Specifically, the TTL/Σdtmay be 3.85, 3.98, 4.1, 4.23, 4.35, or the like.
The air space and the total optical length of all the lenses on the optical axis are reasonably configured, so that the optical lens 100 is light, thin and small, and meanwhile, the lenses have enough air gaps to reduce the assembly difficulty of the lenses and improve the assembly yield of the optical lens 100. Exceeding the upper limit of the relation, the optical total length of the optical lens 100 is too large, which is unfavorable for the light, thin and small-sized optical lens 100; below the lower limit of the relation, the air space between the first lens L1 and the seventh lens L7 on the optical axis is too small, the lens arrangement is compact, the light deflection space is insufficient, and the aberration is difficult to correct.
In some embodiments, the optical lens 100 satisfies the following relationship: 1< SD72/SD11<1.4; the object side surface S1 of the first lens element L1 has a half maximum effective aperture, and the image side surface S14 of the seventh lens element L7 has a half maximum effective aperture, SD 72. Specifically, SD72/SD11 may be 1.05, 1.13, 1.2, 1.28, 1.35, or the like.
By reasonably defining the maximum effective aperture of the object-side surface S1 of the first lens element L1 and the maximum effective aperture of the image-side surface of the seventh lens element, light rays with an edge field of view can enter the image-side surface S14 of the seventh lens element L7 from the object-side surface S1 of the first lens element L1 with a gentle variation trend, thereby reducing the risk of distortion of the optical lens assembly 100. Exceeding the upper limit of the relation, the maximum effective aperture of the image side surface S14 of the seventh lens element L7 is larger, and the chief ray exit angle of the marginal field of view is too large, which is not beneficial to correcting the aberration, or the maximum effective aperture of the first lens element L1 is smaller, which cannot ensure the light entering amount of the optical lens 100, resulting in lower relative brightness of the imaging surface IMG; below the lower limit of the relation, the maximum effective caliber of the seventh lens L7 of the optical lens 100 is too small, so that the optical lens 100 is difficult to have a large image plane characteristic, and is difficult to match with a large-size photosensitive chip, and therefore, the finally assembled camera module is difficult to realize high-pixel imaging.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.5< (SAG41+SAG42)/(SAG 42-SAG 41) <0.8; the SAG41 is a sagittal height of the object side surface S7 of the fourth lens element L4 at the maximum effective half-caliber, that is, a distance from the maximum effective half-caliber of the object side surface S7 of the fourth lens element L4 to an intersection point of the object side surface S7 of the fourth lens element L4 and the optical axis O in the optical axis direction, and the SAG42 is a sagittal height of the image side surface S8 of the fourth lens element L4 at the maximum effective half-caliber, that is, a distance from the maximum effective half-caliber of the image side surface S8 of the fourth lens element L4 to an intersection point of the object side surface S8 of the fourth lens element L4 and the optical axis O in the optical axis direction. Specifically, (SAG41+SAG42)/(SAG 42-SAG 41) may be 0.55, 0.6, 0.65, 0.7 or 0.75, etc.
The shape of the object-side surface and the image-side surface of the fourth lens element L4 at the position of the maximum effective half-aperture can be effectively controlled by satisfying the above-mentioned relation, i.e., the surface shape is not excessively curved, the light angle of the marginal field of view is excessively changed, the assembly sensitivity of the optical lens 100 is large, the surface shape is not excessively flat, the light deflection capability of the marginal field of view is weak, and the aberration of the first lens element L1 to the third lens element L3 is difficult to be corrected.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.6< CT3/ET3<1.6; wherein CT3 is the thickness of the third lens element L3 on the optical axis O, and ET3 is the distance from the maximum effective half-caliber of the object-side surface S5 of the third lens element L3 to the maximum effective half-caliber of the image-side surface S6 of the third lens element L3 in the optical axis direction. Specifically, CT3/ET3 may be 0.65, 0.88, 1.1, 1.33, 1.55, or the like.
The relation is satisfied, the third lens L3 keeps proper thickness ratio, which is beneficial to the processing and forming of the third lens L3 and reduces the assembling difficulty. Exceeding the upper limit of the relation, the thickness of the third lens L3 on the optical axis is too large, which is not beneficial to shortening the total optical length of the optical lens 100, and realizing the effects of lightness, thinness and miniaturization; when the thickness of the edge of the third lens element L3 is too large, the light converging capability of the third lens element L3 is low, so that the aberration of the first lens element L1 in the negative direction cannot be effectively balanced, and the image resolution of the optical lens 100 is reduced.
In some embodiments, the optical lens 100 satisfies the following relationship: 3.5< FNO. Times. IMGH/f <4.4; wherein FNO is the f-number of the optical lens 100, IMGH is half of the image height corresponding to the maximum field angle of the optical lens 100, and f is the effective focal length of the optical lens 100. Specifically, FNO IMGH/f may be 3.55, 3.75, 3.95, 4.15, 4.35, or the like.
The optical lens 100 has a larger aperture to meet the requirements of light flux and longer focal length to meet the depth of field, and can be better combined with a photosensitive chip with a larger size to acquire more signals and improve the imaging resolution. Exceeding the upper limit of the relation, the optical lens 100 has an excessively large aperture number and an excessively small aperture, resulting in insufficient light flux and occurrence of a dark angle phenomenon; below the lower limit of the relation, the effective focal length of the optical lens 100 is too large, the depth of field of the optical lens 100 is too shallow, and meanwhile, the image height of the optical lens 100 is too small, which is not beneficial to the optical lens 100 to adapt to photosensitive chips with larger size and higher pixels, and influences the imaging quality.
In some embodiments, the optical lens 100 satisfies the following relationship: -1.4< R51/R52< -1; wherein R51 is a radius of curvature of the object side surface S9 of the fifth lens element L5 at the optical axis, and R52 is a radius of curvature of the image side surface S10 of the fifth lens element L5 at the optical axis. Specifically, R51/R52 may be-1.35, -1.28, -1.2, -1.13, or-1.05, etc.
The object-side surface and the image-side surface of the fifth lens element L5 are reasonably configured at the paraxial region thereof, so that the fifth lens element L5 can maintain a relatively uniform thickness, and the optical path difference between the marginal light and the paraxial light of the optical lens 100 can be reasonably balanced, thereby reasonably correcting the curvature of field and astigmatism.
In some embodiments, the optical lens 100 satisfies the following relationship: -2.5< f5/f4< -2.1; wherein f5 is an effective focal length of the fifth lens L5, and f4 is an effective focal length of the fourth lens L4. Specifically, f5/f4 may be-2.45, -2.38, -2.3, -2.23, or-2.15, etc.
The above relation is satisfied, and the ratio of the effective focal length of the fifth lens L5 to the effective focal length of the fourth lens L4 is controlled, so that the spherical aberration contribution of the fifth lens L5 and the fourth lens L4 is kept within a reasonable range, which is beneficial to improving the imaging quality of the optical lens 100 in the field area on the optical axis. Exceeding the upper limit of the relation, the refractive power of the fifth lens element L5 relative to the fourth lens element L4 is excessive, such that the fifth lens element L5 and the fourth lens element L4 generate serious astigmatism, which is not beneficial to improving the imaging quality; below the lower limit of the relationship, the refractive power of the fifth lens element L5 with respect to the fourth lens element L4 is too small, which is prone to generate larger edge aberration and more serious chromatic aberration, which is not beneficial to improving the imaging resolution of the optical lens 100.
The optical lens 100 of the present embodiment will be described in detail below with reference to specific parameters.
First embodiment
As shown in fig. 1, fig. 1 is a schematic structural diagram of an optical lens 100 according to a first embodiment of the present application, where the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an optical filter L8, which are sequentially disposed 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 negative refractive power. The materials 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 can be described in the above embodiments, and will not be repeated here.
Further, the object side surface S1 of the first lens element L1 is concave at a paraxial region, and the image side surface S2 of the first lens element L1 is concave at a paraxial region; the object side surface S3 of the second lens element L2 is convex at a paraxial region, and the image side surface S4 of the second lens element L2 is concave at a paraxial region; the object side surface S5 of the third lens element L3 is concave at a paraxial region, and the image side surface S6 of the third lens element L3 is convex at a paraxial region; the object side surface S7 of the fourth lens element L4 is convex at a paraxial region, and the image side surface S8 of the fourth lens element L4 is convex at a paraxial region; the object side surface S9 of the fifth lens element L5 is concave at a paraxial region, and the image side surface S10 of the fifth lens element L5 is concave at a paraxial region; the object side surface S11 of the sixth lens element L6 is concave at a paraxial region, and the image side surface S12 of the sixth lens element L6 is convex at a paraxial region; the object-side surface S13 of the seventh lens element L7 is convex at a paraxial region, and the image-side surface S14 of the seventh lens element L7 is concave at a paraxial region.
Specifically, taking the effective focal length f=2.94 mm of the optical lens 100, half hfov=58.64° of the maximum field angle of the optical lens 100, the optical total length ttl=8.92 mm of the optical lens 100, and the f-number fno=2.04 of the optical lens 100 as examples, other parameters of the optical lens 100 are given in table 1 below. The elements from the object side to the image side are sequentially arranged in the order of the elements from top to bottom in table 1 along the optical axis O of the optical lens 100. In the same lens element, the surface with smaller surface number is the object side surface of the lens element, and the surface with larger surface number is the image side surface of the lens element, and the surface numbers 1 and 2 correspond to the object side surface S1 and the image side surface S2 of the first lens element L1, respectively. The radius Y in table 1 is the radius of curvature of the object side or image side of the corresponding plane number at the optical axis. The first value in the "thickness" parameter array of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image side surface of the lens to the latter surface on the optical axis O. The value of the stop STO in the "thickness" parameter array is the distance between the stop STO and the vertex of the latter surface (the vertex refers to the intersection of the surface and the optical axis O) on the optical axis O, and the direction from the object side surface of the first lens L1 to the image side surface of the last lens is the positive direction of the optical axis O by default. It is understood that the units of Y radius, thickness, effective focal length in Table 1 are all mm. And the effective focal length, refractive index, abbe number of each lens in table 1 were 587.56nm.
TABLE 1
In the first embodiment, the object side surface and the image side surface of any one of the first lens L1 to the seventh lens L7 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of the radius R of Y in table 1 above); k is a conical coefficient; ai is a correction coefficient corresponding to the i-th higher term of the aspherical surface. Table 2 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors S1-S14 in the first embodiment.
TABLE 2
Referring to fig. 2 (a), fig. 2 (a) shows the optical spherical aberration diagrams of the optical lens 100 in the first embodiment at the wavelengths 486.13nm, 587.56nm and 656.27 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift in mm, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the optical lens 100 in the first embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality.
Referring to fig. 2 (B), fig. 2 (B) is a light astigmatism diagram of the optical lens 100 at a wavelength of 587.56nm in the first embodiment. The abscissa along the X-axis direction represents the focus shift in mm, and the ordinate along the Y-axis direction represents the image height in mm. T represents the curvature of the imaging plane IMG in the meridian direction, S represents the curvature of the imaging plane IMG in the sagittal direction, and it can be seen from fig. 2 (B) that the astigmatism of the optical lens 100 is well compensated at the wavelength of 587.56 nm.
Referring to fig. 2 (C), fig. 2 (C) is a graph showing distortion of the optical lens 100 at a wavelength of 587.56nm in the first embodiment. 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 fig. 2 (C), at the wavelength of 587.56nm, the distortion of the optical lens 100 becomes well corrected.
Second embodiment
Referring to fig. 3, fig. 3 is a schematic structural diagram of an optical lens 100 according to a second embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an optical filter L8, which are disposed in order from the object side to the 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. The materials 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 can be described in the above embodiments, and will not be repeated here.
Further, the object side surface S1 of the first lens element L1 is concave at a paraxial region, and the image side surface S2 of the first lens element L1 is concave at a paraxial region; the object side surface S3 of the second lens element L2 is convex at a paraxial region, and the image side surface S4 of the second lens element L2 is concave at a paraxial region; the object side surface S5 of the third lens element L3 is convex at a paraxial region, and the image side surface S6 of the third lens element L3 is convex at a paraxial region; the object side surface S7 of the fourth lens element L4 is convex at a paraxial region, and the image side surface S8 of the fourth lens element L4 is convex at a paraxial region; the object side surface S9 of the fifth lens element L5 is concave at a paraxial region, and the image side surface S10 of the fifth lens element L5 is concave at a paraxial region; the object side surface S11 of the sixth lens element L6 is concave at a paraxial region, and the image side surface S12 of the sixth lens element L6 is convex at a paraxial region; the object-side surface S13 of the seventh lens element L7 is convex at a paraxial region, and the image-side surface S14 of the seventh lens element L7 is concave at a paraxial region.
In the second embodiment, the effective focal length f=2.44 mm of the optical lens 100, half hfov=63.08° of the maximum field angle of the optical lens 100, the total optical length ttl=8.86 mm of the optical lens 100, and the f-number fno=2.06 of the optical lens 100 are taken as examples.
The other parameters in the second embodiment are given in the following table 3, and the definition of the parameters can be obtained from the description of the foregoing embodiment, which is not repeated here. It is understood that the units of Y radius, thickness, effective focal length in Table 3 are all mm. And the effective focal length, refractive index, abbe number of each lens in table 3 were 587.56nm.
TABLE 3 Table 3
In the second embodiment, table 4 gives the higher order coefficients that can be used for each aspherical mirror in the second embodiment, where each aspherical mirror shape can be defined by the formula given in the first embodiment.
TABLE 4 Table 4
Referring to fig. 4, fig. 4 shows a longitudinal spherical aberration curve, an astigmatic curve and a distortion curve of the optical lens 100 according to the second embodiment, and the specific definition is described with reference to the first embodiment, which is not repeated here. As can be seen from fig. 4 (a), the optical lens 100 in the second embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality. As can be seen from fig. 4 (B), the astigmatism of the optical lens 100 is well compensated at the wavelength of 587.56 nm. As can be seen from fig. 4 (C), the distortion of the optical lens 100 becomes well corrected at the wavelength of 587.56 nm.
Third embodiment
Referring to fig. 5, fig. 5 is a schematic diagram illustrating a structure of an optical lens 100 according to a third embodiment of the application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an optical filter L8, which are disposed in order from the object side to the 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 negative refractive power. The materials 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 can be described in the above embodiments, and will not be repeated here.
Further, the object side surface S1 of the first lens element L1 is concave at a paraxial region, and the image side surface S2 of the first lens element L1 is concave at a paraxial region; the object side surface S3 of the second lens element L2 is convex at a paraxial region, and the image side surface S4 of the second lens element L2 is concave at a paraxial region; the object side surface S5 of the third lens element L3 is convex at a paraxial region, and the image side surface S6 of the third lens element L3 is concave at a paraxial region; the object side surface S7 of the fourth lens element L4 is convex at a paraxial region, and the image side surface S8 of the fourth lens element L4 is convex at a paraxial region; the object side surface S9 of the fifth lens element L5 is concave at a paraxial region, and the image side surface S10 of the fifth lens element L5 is concave at a paraxial region; the object side surface S11 of the sixth lens element L6 is concave at a paraxial region, and the image side surface S12 of the sixth lens element L6 is convex at a paraxial region; the object-side surface S13 of the seventh lens element L7 is convex at a paraxial region, and the image-side surface S14 of the seventh lens element L7 is concave at a paraxial region.
In the third embodiment, the effective focal length f=3.04 mm of the optical lens 100, half hfov= 57.55 ° of the maximum field angle of the optical lens 100, the total optical length ttl=8.8 mm of the optical lens 100, and the f-number fno=2.1 of the optical lens 100 are taken as examples.
The other parameters in the third embodiment are given in the following table 5, and the definition of the parameters can be obtained from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, effective focal length in Table 5 are all mm. And the effective focal length, refractive index, abbe number of each lens in table 5 were 587.56nm.
TABLE 5
In a third embodiment, table 6 gives the higher order coefficients that can be used for each of the aspherical mirror surfaces in the third embodiment, where each of the aspherical surface profiles can be defined by the formula given in the first embodiment.
TABLE 6
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Referring to fig. 6, fig. 6 shows a longitudinal spherical aberration curve, an astigmatic curve and a distortion curve of the optical lens 100 according to the third embodiment, and the specific definition is described with reference to the first embodiment, which is not repeated here. As can be seen from fig. 6 (a), the optical lens 100 in the third embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality. As can be seen from fig. 6 (B), the astigmatism of the optical lens 100 is well compensated at the wavelength of 587.56 nm. As can be seen from fig. 6 (C), the distortion of the optical lens 100 becomes well corrected at the wavelength of 587.56 nm.
Fourth embodiment
Fig. 7 is a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present application. The optical lens 100 includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an optical filter L8, which are disposed in order from the object side to the 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. The materials 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 can be described in the above embodiments, and will not be repeated here.
Further, the object side surface S1 of the first lens element L1 is concave at a paraxial region, and the image side surface S2 of the first lens element L1 is concave at a paraxial region; the object side surface S3 of the second lens element L2 is convex at a paraxial region, and the image side surface S4 of the second lens element L2 is concave at a paraxial region; the object side surface S5 of the third lens element L3 is convex at a paraxial region, and the image side surface S6 of the third lens element L3 is concave at a paraxial region; the object side surface S7 of the fourth lens element L4 is convex at a paraxial region, and the image side surface S8 of the fourth lens element L4 is convex at a paraxial region; the object side surface S9 of the fifth lens element L5 is concave at a paraxial region, and the image side surface S10 of the fifth lens element L5 is concave at a paraxial region; the object side surface S11 of the sixth lens element L6 is concave at a paraxial region, and the image side surface S12 of the sixth lens element L6 is convex at a paraxial region; the object-side surface S13 of the seventh lens element L7 is convex at a paraxial region, and the image-side surface S14 of the seventh lens element L7 is concave at a paraxial region.
In the fourth embodiment, the effective focal length f=3.05 mm of the optical lens 100, half hfov= 57.87 ° of the maximum field angle of the optical lens 100, the total optical length ttl=8.88 mm of the optical lens 100, and the f-number fno=2.12 of the optical lens 100 are taken as examples.
The other parameters in the fourth embodiment are given in the following table 7, and the definition of the parameters can be obtained from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, effective focal length in Table 7 are all mm. And the effective focal length, refractive index, abbe number of each lens in table 7 were 587.56nm.
TABLE 7
In the fourth embodiment, table 8 gives the higher order coefficients that can be used for each aspherical mirror in the fourth embodiment, where each aspherical mirror shape can be defined by the formula given in the first embodiment.
TABLE 8
Referring to fig. 8, fig. 8 shows a longitudinal spherical aberration curve, an astigmatic curve and a distortion curve of the optical lens 100 according to the fourth embodiment, and the specific definition is described with reference to the first embodiment, which is not repeated here. As can be seen from fig. 8 (a), the optical lens 100 in the fourth embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality. As can be seen from fig. 8 (B), the astigmatism of the optical lens 100 is well compensated at the wavelength of 587.56 nm. As can be seen from fig. 8 (C), the distortion of the optical lens 100 becomes well corrected at the wavelength of 587.56 nm.
Fifth embodiment
Fig. 9 is a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present application. The optical lens 100 includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an optical filter L8, which are disposed in order from the object side to the 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. The materials 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 can be described in the above embodiments, and will not be repeated here.
Further, the object side surface S1 of the first lens element L1 is concave at a paraxial region, and the image side surface S2 of the first lens element L1 is concave at a paraxial region; the object side surface S3 of the second lens element L2 is convex at a paraxial region, and the image side surface S4 of the second lens element L2 is concave at a paraxial region; the object side surface S5 of the third lens element L3 is concave at a paraxial region, and the image side surface S6 of the third lens element L3 is convex at a paraxial region; the object side surface S7 of the fourth lens element L4 is convex at a paraxial region, and the image side surface S8 of the fourth lens element L4 is convex at a paraxial region; the object side surface S9 of the fifth lens element L5 is concave at a paraxial region, and the image side surface S10 of the fifth lens element L5 is concave at a paraxial region; the object side surface S11 of the sixth lens element L6 is concave at a paraxial region, and the image side surface S12 of the sixth lens element L6 is convex at a paraxial region; the object-side surface S13 of the seventh lens element L7 is concave at a paraxial region, and the image-side surface S14 of the seventh lens element L7 is concave at a paraxial region.
In the fifth embodiment, the effective focal length f=2.86 mm of the optical lens 100, half hfov=60.10° of the maximum field angle of the optical lens 100, the total optical length ttl=8.60 mm of the optical lens 100, and the f-number fno=2.20 of the optical lens 100 are taken as examples.
The other parameters in the fifth embodiment are given in the following table 9, and the definition of the parameters can be obtained from the foregoing description, which is not repeated here. It is understood that the units of Y radius, thickness, effective focal length in Table 9 are all mm. And the effective focal length, refractive index, abbe number of each lens in table 9 were 587.56nm.
TABLE 9
In the fifth embodiment, table 10 gives the higher order coefficients that can be used for each aspherical mirror surface in the fifth embodiment, where each aspherical surface profile can be defined by the formula given in the first embodiment.
Table 10
Referring to fig. 10, fig. 10 shows a longitudinal spherical aberration curve, an astigmatic curve and a distortion curve of the optical lens 100 according to the fifth embodiment, and the specific definition is described with reference to the first embodiment, which is not repeated here. As can be seen from fig. 10 (a), the optical lens 100 in the fifth embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality. As can be seen from fig. 10 (B), the astigmatism of the optical lens 100 is well compensated at the wavelength of 587.56 nm. As can be seen from fig. 10 (C), the distortion of the optical lens 100 becomes well corrected at the wavelength of 587.56 nm.
Referring to table 11, table 11 is a summary of the ratios of the relationships in the first embodiment to the fifth embodiment of the present application.
TABLE 11
Referring to fig. 11, the present application further discloses an image capturing module, where the image capturing module 200 includes a photosensitive chip 201 and the optical lens 100 according to any one of the above embodiments, and the photosensitive chip 201 is disposed on an image side of the optical lens 100, and at this time, a photosensitive surface of the photosensitive chip can be regarded as an imaging surface IMG of the optical lens 100. Specifically, the photosensitive chip may be a charge coupled device (Charge Coupled Device, CCD) or a complementary metal oxide semiconductor device (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor). The optical lens 100 is adopted in the camera module, so that the design of the optical lens with a large visual angle can be realized, and meanwhile, the design of light, thin and small size can be realized.
Referring to fig. 12, the invention also discloses an electronic device, and the electronic device 300 includes a housing 301 and the camera module 200 described in the foregoing embodiment, where the camera module 200 is disposed in the housing 301. Specifically, the electronic device 300 may be, but is not limited to, a portable telephone, a video phone, a smart phone, an electronic book reader, a vehicle-mounted image pickup device such as a car recorder, or a wearable device such as a smart watch. When the electronic device 300 is a smart phone, the housing 301 may be a middle frame of the electronic device. The camera module is adopted in the electronic equipment, so that the light, thin and miniaturized design can be realized while the large-view angle design of the optical lens is realized.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (8)

1. An optical lens is characterized in that seven lenses with refractive power are shared, and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens are arranged in sequence 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 a paraxial region and a concave image-side surface at a paraxial region;
the second lens element with refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the third lens element with refractive power;
the fourth lens element with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
the fifth lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the sixth lens element with positive refractive power; the object side surface of the sixth lens element is concave at a paraxial region, and the image side surface of the sixth lens element is convex at a paraxial region;
The seventh lens element with negative refractive power has a concave image-side surface at a paraxial region;
the optical lens satisfies the following relation:
4.4mm < TTL/TAN (HFOV) <5.7mm,3.8< TTL/Sigma DT <4.4, and 1< SD72/SD11<1.4;
wherein TTL is the distance between the object side surface of the first lens element and the imaging surface of the optical lens element on the optical axis, HFOV is half of the maximum field angle of the optical lens element, Σdt is the sum of the air spaces between each two adjacent lens elements of the first lens element and the seventh lens element on the optical axis, SD11 is half of the maximum effective aperture of the object side surface of the first lens element, and SD72 is half of the maximum effective aperture of the image side surface of the seventh lens element.
2. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:
3.5<|f1/f+f7/f|<4.3；
wherein f1 is an effective focal length of the first lens, f7 is an effective focal length of the seventh lens, and f is an effective focal length of the optical lens.
3. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:
0.5<(SAG41+SAG42)/(SAG42-SAG41)<0.8；
wherein SAG41 is the sagittal height of the object side surface of the fourth lens element at the maximum effective half-caliber, and SAG42 is the sagittal height of the image side surface of the fourth lens element at the maximum effective half-caliber.
4. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:
0.6<CT3/ET3<1.6；
wherein CT3 is the thickness of the third lens element on the optical axis, ET3 is the distance from the maximum effective half-caliber of the object-side surface of the third lens element to the maximum effective half-caliber of the image-side surface of the third lens element in the direction of the optical axis.
5. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:
3.5<FNO*IMGH/f<4.4；
wherein FNO is the f-number of the optical lens, IMGH is half of the image height corresponding to the maximum field angle of the optical lens, and f is the effective focal length of the optical lens.
6. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:
-1.4< R51/R52< -1, and/or-2.5 < f5/f4< -2.1;
wherein R51 is a radius of curvature of the object side surface of the fifth lens element at the optical axis, R52 is a radius of curvature of the image side surface of the fifth lens element at the optical axis, f5 is an effective focal length of the fifth lens element, and f4 is an effective focal length of the fourth lens element.
7. An imaging module, wherein the imaging module comprises a photosensitive chip and the optical lens according to any one of claims 1 to 6, and the photosensitive chip is disposed on an 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.
CN202210483070.1A 2022-05-05 2022-05-05 Optical lens, camera module and electronic equipment Active CN114740605B (en)

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CN111198438A (en) * 2020-03-05 2020-05-26 玉晶光电(厦门)有限公司 Optical imaging lens
CN113031211A (en) * 2019-12-25 2021-06-25 大立光电股份有限公司 Photographing optical lens assembly, image capturing device and electronic device
CN113138458A (en) * 2021-04-06 2021-07-20 江西晶超光学有限公司 Optical system, image capturing module and electronic equipment
CN113777760A (en) * 2021-10-19 2021-12-10 辽宁中蓝光电科技有限公司 Seven-piece type wide-angle lens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110850557A (en) * 2019-12-10 2020-02-28 浙江舜宇光学有限公司 Optical imaging lens
CN113031211A (en) * 2019-12-25 2021-06-25 大立光电股份有限公司 Photographing optical lens assembly, image capturing device and electronic device
CN111198438A (en) * 2020-03-05 2020-05-26 玉晶光电(厦门)有限公司 Optical imaging lens
CN113138458A (en) * 2021-04-06 2021-07-20 江西晶超光学有限公司 Optical system, image capturing module and electronic equipment
CN113777760A (en) * 2021-10-19 2021-12-10 辽宁中蓝光电科技有限公司 Seven-piece type wide-angle lens

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