CN113484982A - Optical lens, camera module and electronic equipment - Google Patents
Optical lens, camera module and electronic equipment Download PDFInfo
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- CN113484982A CN113484982A CN202110669395.4A CN202110669395A CN113484982A CN 113484982 A CN113484982 A CN 113484982A CN 202110669395 A CN202110669395 A CN 202110669395A CN 113484982 A CN113484982 A CN 113484982A
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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
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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
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- 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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Abstract
The invention discloses an optical lens, a camera module and an electronic device, wherein the optical lens comprises the following components which are arranged along an optical axis from an object side to an image side in sequence: the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface at paraxial region; the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface at paraxial region; the third lens element with positive refractive power has a convex object-side surface at paraxial region; the object side surface of the fourth lens element is concave at a paraxial region; the fifth lens element with negative refractive power has a concave object-side surface and a convex image-side surface at paraxial region; the sixth lens element with positive refractive power; the object side surface of the seventh lens is a convex surface at the optical axis; the eighth lens element with negative refractive power has a concave image-side surface at a paraxial region. The optical lens satisfies the following relation: f/EPD is more than or equal to 1.62 and less than or equal to 2.16. The optical lens, the camera module and the electronic equipment provided by the embodiment of the invention have the characteristics of large aperture and large image surface, and can realize high-quality imaging.
Description
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
With the development of science and technology, the specifications of electronic products are changing day by day, and optical lenses in key parts of the electronic products are also more diversified, so that the optical lenses are not only required to be light and thin but also required to have good imaging quality, and are also required to be designed with large apertures and large image planes. The current optical lens has increasingly thinner and needs to meet the market demand of aperture design, but it is a great challenge in the industry to increase the aperture of the optical lens and shorten the lens length while maintaining good imaging quality.
Disclosure of Invention
The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can realize miniaturization, have the characteristics of a large aperture and an oversized image plane and improve the imaging effect of the optical lens.
In order to achieve the above object, in a first aspect, the present invention discloses an optical lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, which are arranged in order from an object side to an image side along an optical axis;
the first lens element with positive refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;
the second lens element with negative refractive power has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region;
the third lens element with positive refractive power has a convex object-side surface at paraxial region;
the fourth lens element with refractive power has a concave object-side surface at paraxial region;
the fifth lens element with negative refractive power has a concave object-side surface at a paraxial region thereof and a convex image-side surface at a paraxial region thereof;
the sixth lens element with positive refractive power;
the seventh lens element with refractive power has a convex object-side surface at paraxial region;
the eighth lens element with negative refractive power has a concave image-side surface at a paraxial region;
the optical lens satisfies the following relation:
1.62≤f/EPD≤2.16；
wherein f is an effective focal length of the optical lens, and EPD is an entrance pupil diameter of the optical lens.
In the optical lens system provided by the application, in order to obtain a high-quality imaging effect, the refractive powers and the surface shapes of the eight lens elements are reasonably configured, that is, the first lens element is set to have positive refractive power, the second lens element is set to have negative refractive power, and the third lens element is set to have positive refractive power, so that the total length of the optical lens system can be shortened, and the chromatic aberration of the optical lens system can be balanced. Because the first lens element and the second lens element have convex-concave surface shapes at the paraxial region and the object-side surface of the third lens element has a convex surface at the paraxial region, the matching of the surface shapes can increase the surface shape adaptation degree of the front lens assembly (i.e., the first lens element, the second lens element and the third lens element), reduce the incident angle of incident light, further reduce the occurrence of chromatic aberration, and improve the imaging quality of the optical lens. The object-side surface of the fourth lens element is concave at a paraxial region thereof, and provides a powerful condition for the light rays to gradually diffuse toward the rear lens group (i.e., the fifth lens element, the sixth lens element, the seventh lens element, and the eighth lens element), and when the incident light rays are further diffused by the fifth lens element with negative refractive power and a concave-convex structure, the incident angle of the incident light rays is corrected by the sixth lens element with positive refractive power, so as to reduce the high-order aberration. After passing through the eighth lens element with negative refractive power, the incident light is converged on the imaging surface of the optical lens at a small incident angle, so that the illuminance of the optical lens can be effectively improved, and high-quality imaging of the optical lens is realized. In addition, the optical lens of the present application satisfies the relation: f/EPD is more than or equal to 1.62 and less than or equal to 2.16, so that the optical lens has enough light incoming quantity, a dark corner at the periphery of the image sensor is avoided, the shooting effect in a dark environment is improved, the resolution limit can be improved by the large aperture, and the imaging quality of the optical lens is improved while the optical lens is ensured to be light, thin and small.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation:
1.3＜TTL/ImgH＜1.6；
ImgH≥7.2mm；
wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element of the optical lens to an image plane of the optical lens, and ImgH is a radius (i.e., a half-image height) of a maximum effective imaging circle of the optical lens.
The size of the image sensor is determined by the half-image height, the larger the half-image height is, the larger the size of the maximum image sensor which can be supported is, and when the relation is satisfied, the optical lens can support the high-pixel image sensor, so that the resolution of the optical lens is improved, and the high-quality imaging effect is obtained. When the total length of the optical lens is reduced, the total length of the optical lens can be compressed, thereby making it easy to achieve ultra-thinning and miniaturization 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:
1＜SD11/SD31＜1.2；
wherein SD11 is the maximum effective radius of the object side surface of the first lens, and SD31 is the maximum effective radius of the object side surface of the third lens.
When the above relational expression is satisfied, the size of the head module (i.e., the first lens, the second lens, and the third lens) of the optical lens can be compressed, so that the small head design of the optical lens is easily realized, and simultaneously, the image plane illuminance is improved, so that the light deflection angle is controlled within a proper range, and the reduction of the sensitivity of the head module of the optical lens is facilitated.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation:
0<|f/f4|≤0.30；
wherein f4 is the focal length of the fourth lens.
The fourth lens element can provide positive refractive power or negative refractive power to adjust the overall refractive power of the optical lens assembly, so that the fourth lens element forms a quasi-symmetric structure with the first lens element, the second lens element and the third lens element in front of the fourth lens element, thereby balancing the distortion of the front lens assembly formed by the four lens elements. Meanwhile, high-order aberration caused by overlarge refractive index can be avoided by satisfying the relational expression, and the imaging quality of the optical lens can be improved.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation:
0<|f6/R61|＜5；
wherein f6 is a focal length of the sixth lens, and R61 is a radius of curvature of an object-side surface of the sixth lens at the optical axis.
When the above relation is satisfied, the sixth lens element includes at least one inflection point, so that the aberration problem of the optical lens can be improved, and the resolving power of the optical lens can be improved.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation:
0.8<R22/R31＜4；
wherein R22 is a radius of curvature of an image-side surface of the second lens element at the optical axis, and R31 is a radius of curvature of an object-side surface of the third lens element at the optical axis.
When the relation is satisfied, the curvature radius of the image side surface of the second lens at the optical axis can be matched with the curvature radius of the object side surface of the third lens at the optical axis, so that the reflection effect of light on the surface of the lens can be reduced, the illumination and the image quality of the optical lens are improved, and the influence of stray light is avoided.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation:
1≤(CT4+T45)/(CT5+CT6)≤1.5；
wherein CT4 is a thickness of the fourth lens element on the optical axis, T45 is a distance between the fourth lens element and the fifth lens element on the optical axis, CT5 is a thickness of the fifth lens element on the optical axis, and CT6 is a thickness of the sixth lens element on the optical axis.
Because the thickness of each lens and the interval between each lens directly influence the degree of difficulty of optical lens's shaping and manufacturing, consequently, when satisfying above-mentioned relational expression, can make the thickness of fourth lens, fifth lens and sixth lens is suitable, and the interval between each lens is reasonable, can effectively promote optical lens's compact structure to be favorable to the shaping and the equipment of each lens.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation:
0≤|R81-R82|/|R81+R82|＜5；
wherein R81 is a radius of curvature of an object-side surface of the eighth lens element at the optical axis, and R82 is a radius of curvature of an image-side surface of the eighth lens element at the optical axis.
When the above relation is satisfied, it is beneficial to correct the aberration generated by the optical lens under the condition of large aperture, so that the refractive power configuration of the optical lens in the direction perpendicular to the optical axis is uniform, and the distortion and the aberration generated by the front lens group (for example, the first lens element to the seventh lens element located before the eighth lens element) can be greatly corrected. And the excessive bending of the surface shape of the eighth lens can be avoided by satisfying the relational expression, and the eighth lens is easy to mold and manufacture.
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 can realize the miniaturization design, can also realize the shooting requirements of a large aperture and a large image plane, and can improve the resolution power of the camera module and improve the imaging effect of the camera module.
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 has the advantages that the miniaturized design is realized, the characteristics of a large aperture and an oversized image plane are realized, and the imaging effect of the electronic equipment can be effectively improved.
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 invention, the optical lens adopts eight lenses with refractive power, and the total length of the optical lens can be shortened and the chromatic aberration of the optical lens can be balanced by reasonably configuring the refractive power and the surface type of each lens, namely the first lens with positive refractive power, the second lens with negative refractive power and the third lens with positive refractive power. Because the first lens and the second lens are both convex-concave structures at the paraxial region, and the object-side surface of the third lens is convex at the paraxial region, the matching form of the surface-type structures can increase the surface-type adaptation degree of the front lens group (i.e. the first lens, the second lens and the third lens), reduce the incident angle of incident light, further reduce the generation of chromatic aberration, and improve the imaging quality of the optical lens. The object-side surface of the fourth lens element, which is concave at a paraxial region thereof, provides a powerful condition for the light rays to gradually diffuse toward the rear lens element (i.e., the fifth lens element, the sixth lens element, the seventh lens element, and the eighth lens element), and when the incident light rays are further diffused by the fifth lens element with negative refractive power and a concave-convex structure, the incident angle of the incident light rays is corrected by the sixth lens element with positive refractive power to reduce the high-order aberration. After passing through the eighth lens element with negative refractive power, the incident light is converged on the imaging surface of the optical lens at a small incident angle, so that the illuminance of the optical lens can be effectively increased, and high-quality imaging of the optical lens is realized. In addition, the optical lens of the present application satisfies the relation: f/EPD is more than or equal to 1.62 and less than or equal to 2.16, so that the optical lens has enough light incoming quantity, a dark corner at the periphery of the image sensor is avoided, the shooting effect in a dark environment is improved, the resolution limit can be improved by the large aperture, and the imaging quality of the optical lens is improved while the structure of the optical lens is ensured to be light, thin and small by reasonably configuring the refractive power of each lens.
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 light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 3 is a schematic structural diagram of an optical lens disclosed in the second embodiment of the present application;
fig. 4 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 5 is a schematic structural diagram of an optical lens disclosed in the third embodiment of the present application;
fig. 6 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 7 is a schematic structural diagram of an optical lens disclosed in a fourth embodiment of the present application;
fig. 8 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 9 is a schematic structural diagram of an optical lens disclosed in a fifth embodiment of the present application;
fig. 10 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 11 is a schematic structural diagram of the camera module disclosed in the present application;
fig. 12 is a schematic structural diagram of an electronic device disclosed in the present application.
Icon: o, an optical axis; l1, first lens; 11. an object side surface of the first lens; 12. an image side surface of the first lens; l2, second lens; 21. an object side surface of the second lens; 22. an image side surface of the second lens; l3, third lens; 31. an object side surface of the third lens; 32. an image side surface of the third lens; l4, fourth lens; 41. an object-side surface of the fourth lens; 42. an image side surface of the fourth lens; l5, fifth lens; 51. an object-side surface of the fifth lens; 52. an image-side surface of the fifth lens element; l6, sixth lens; 61. an object side surface of the sixth lens; 62. an image-side surface of the sixth lens element; l7, seventh lens; 71. an object side surface of the seventh lens; 72. an image-side surface of the seventh lens element; l8, eighth lens; 81. an object side surface of the eighth lens; 82. an image-side surface of the eighth lens element; 90. an infrared filter; 100. an optical lens; 101. an imaging plane; 102. a diaphragm; 200. a camera module; 201. an image sensor; 300. an electronic device.
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, according to a first aspect of the present application, an optical lens 100 is disclosed, the optical lens 100 includes 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 eighth lens L8, which are disposed in order from an object side to an image side along an optical axis O. The first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has positive refractive power or negative refractive power, the fifth lens element L5 has negative refractive power, the sixth lens element L6 has positive refractive power, the seventh lens element L7 has positive refractive power or negative refractive power, and the eighth lens element L8 has negative refractive power. During imaging, light rays enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 in sequence from the object side of the first lens L1, and finally form an image on the image forming surface 101 of the optical lens 100.
Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is concave at the paraxial region O; the object-side surface 21 of the second lens element L2 is convex 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 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 concave at the paraxial region O, and the image-side surface 52 of the fifth lens element L5 is convex 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 is convex at the optical axis O, and the image-side surface 72 of the seventh lens element is convex or concave at the optical axis O; the object-side surface 81 of the eighth lens element L8 is convex or concave along the optical axis O, and the image-side surface 82 of the eighth lens element L8 is concave along the optical axis O.
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, the seventh lens L7, and the eighth lens L8 may all be glass lenses, so that the temperature sensitivity of the optical lens 100 may be reduced while the optical effect is good.
In addition, it is understood that, in other embodiments, when the optical lens 100 is applied to an electronic device such as a smartphone or a smart tablet, 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, the seventh lens L7, and the eighth lens L8 may also be plastics, so that the optical lens 100 is light and thin, and the complex lens is easier to process.
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 object side of the optical lens 100 and the object side 11 of the first lens L1. 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 90, and the infrared filter 90 is disposed between the eighth lens element L8 and the image plane 101 of the optical lens 100. And an infrared filter 90 is selected for use, and the imaging quality is improved by filtering infrared light, so that the imaging is more in line with the visual experience of human eyes. It is understood that the infrared filter 90 may be made of an optical glass coating, a colored glass, or an infrared filter 90 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: f/EPD is more than or equal to 1.62 and less than or equal to 2.16;
where f is the effective focal length of the optical lens 100, and EPD is the entrance pupil diameter of the optical lens 100. Through the determination of the above relational expression, the optical lens 100 can be ensured to have sufficient light entering amount, dark corners around the image sensor are avoided, further, when the f/EPD is less than or equal to 1.7, sufficient incident light can effectively improve the shooting effect in a dark environment, the size of the Airy spots can be reduced by the large aperture, the resolving power limit is further improved, and the imaging quality is better improved by reasonably configuring the refractive power of each lens.
In some embodiments, the optical lens 100 satisfies the following relationship: TTL/ImgH is more than 1.3 and less than 1.6;
wherein, TTL is a distance from the object-side surface 11 of the first lens element L1 of the optical lens system 100 to the image plane 101 of the optical lens system 100 on the optical axis O, and ImgH is a radius (i.e. half-image height) of a maximum effective image circle of the optical lens system 100. Since the half-image height determines the size of the image sensor, the larger the half-image height is, the larger the supportable maximum image sensor size is, and when the above relation is satisfied, the optical lens 100 can be made to support a high-pixel image sensor; as the overall length of the optical lens 100 is reduced, the overall length of the optical lens 100 can be compressed, thereby making it easy for the optical lens 100 to be ultra-thin and miniaturized.
Further, in some embodiments, the optical lens 100 satisfies the following relationship: ImgH is more than or equal to 7.2 mm;
wherein ImgH is the radius of the maximum effective imaging circle of the optical lens 100. When the above relation is satisfied, the optical lens 100 has a larger imaging surface 101, and can be used with a larger-sized image sensor, so that the resolution of the optical lens 100 can be improved, and a high-quality imaging effect can be obtained.
In some embodiments, the optical lens 100 satisfies the following relationship: 1 < SD11/SD31 < 1.2;
SD11 is the maximum effective radius of the object-side surface 11 of the first lens L1, and SD31 is the maximum effective radius of the object-side surface 31 of the third lens L3. When the above relation is satisfied, the size of the head module (i.e., the first lens L1, the second lens L2, and the third lens L3) of the optical lens 100 can be reduced, so that the small head design of the optical lens 100 is easily achieved, and the image plane illumination is improved, so that the light deflection angle is controlled within a proper range, which is beneficial to reducing the sensitivity of the head module of the optical lens 100. When the ratio thereof is lower than the lower limit, the maximum effective radius of the object-side surface 31 of the third lens L3 is significantly larger than the maximum effective radius of the object-side surface 11 of the first lens L1 at SD11, so that it is difficult for marginal rays to control aberrations and image plane illuminance. When the ratio exceeds the upper limit, the deflection angle of the marginal ray is too large, which increases the sensitivity of the lens.
In some embodiments, the optical lens 100 satisfies the following relationship: 0< | f/f4|, is less than or equal to 0.30;
where f4 is the focal length of the fourth lens L4. The fourth lens element L4 can provide positive refractive power or negative refractive power to adjust the overall refractive power of the optical lens assembly 100, so that the fourth lens element L4, the first lens element L1, the second lens element L2 and the third lens element L3 in front of the fourth lens element L4 form a quasi-symmetric structure, thereby balancing the distortion generated by the front lens group formed by the above-mentioned four lens elements. Meanwhile, satisfying the above relational expression can avoid high-order aberration caused by too large refractive index, which is beneficial to improving the imaging quality of the optical lens 100.
In some embodiments, the optical lens 100 satisfies the following relationship: 0< | f6/R61| < 5;
where f6 is the focal length of the sixth lens L6, and R61 is the radius of curvature of the object-side surface 61 of the sixth lens L6 at the optical axis O. When the above relational expression is satisfied, the sixth lens element L6 includes at least one inflection point, so that the aberration problem of the optical lens 100 can be improved, and the resolving power of the optical lens 100 can be improved.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.8< R22/R31 < 4;
wherein R22 is the radius of curvature of the image-side surface 22 of the second lens element L2 along the optical axis O, and R31 is the radius of curvature of the object-side surface 31 of the third lens element L3 along the optical axis O. When the above relation is satisfied, the curvature radius of the image-side surface 22 of the second lens element L2 at the optical axis O and the curvature radius of the object-side surface 31 of the third lens element L3 at the optical axis O can be matched with each other, so that the reflection effect of light on the lens surface can be reduced, the illumination and the image quality of the optical lens 100 can be improved, and the influence of stray light can be avoided.
In some embodiments, the optical lens 100 satisfies the following relationship: 1 to (CT4+ T45)/(CT5+ CT6) to 1.5;
wherein, CT4 is the thickness of the fourth lens element L4 on the optical axis O, T45 is the distance between the fourth lens element L4 and the fifth lens element L5 on the optical axis O, CT5 is the thickness of the fifth lens element L5 on the optical axis O, and CT6 is the thickness of the sixth lens element L6 on the optical axis O. Since the thickness of each lens and the distance between the lenses directly affect the difficulty of molding and manufacturing the optical lens 100, when the above relation is satisfied, the thicknesses of the fourth lens L4, the fifth lens L5 and the sixth lens L6 are appropriate, and the distance between the lenses is reasonable, so that the structural compactness of the optical lens 100 can be effectively improved, and the molding and assembling of the lenses are facilitated.
In some embodiments, the optical lens 100 satisfies the following relationship: R81-R82I/R81 + R82I is more than or equal to 0 and less than 5;
wherein R81 is a radius of curvature of the object-side surface 81 of the eighth lens element L8 along the optical axis O, and R82 is a radius of curvature of the image-side surface 82 of the eighth lens element L8 along the optical axis O. When the above-mentioned relation is satisfied, it is advantageous to correct the aberration generated by the optical lens system 100 under the condition of large aperture, so that the refractive power of the optical lens system in the direction perpendicular to the optical axis O is uniformly configured, and the distortion and aberration generated by the front lens group (e.g. the first lens element L1 to the seventh lens element L7 before the eighth lens element L8) can be greatly corrected. Satisfying the above relational expression can avoid the excessive curvature of the surface shape of the eighth lens L8, and the eighth lens L8 can be easily molded and manufactured.
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 stop 102, 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, an eighth lens L8, and an infrared filter 90, which are arranged in order from an object side to an image side along an optical axis O.
Further, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, the sixth lens element L6 has positive refractive power, the seventh lens element L7 has negative refractive power, and the eighth lens element L8 has negative refractive power.
Furthermore, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and concave at the paraxial region O, and both the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex 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 concave and convex 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 concave and convex 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, respectively, at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are respectively convex and 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 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; the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are respectively convex and concave at the optical axis O, and the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are both convex at the circumference.
Specifically, taking the effective focal length f of the optical lens 100 as 9.22mm, the aperture value FNO of the optical lens 100 as 1.84, the field angle FOV of the optical lens 100 as 74.45 °, and the total length TTL of the optical lens 100 as 10.60mm as examples, 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 2 and 3 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 (e.g., 587.6 nm).
In the first embodiment, the object-side surface and the image-side surface of any one of the first lens L1 through the eighth lens L8 are aspheric, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:
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 of the aspheric surface, c ═ 1/Y (i.e., paraxial curvature c is the inverse of the radius of curvature Y in table 1 above); k is a conic coefficient; ai is the 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.
TABLE 1
TABLE 2
Referring to fig. 2 (a), fig. 2 (a) shows a light spherical aberration curve of the optical lens 100 in the first embodiment at 468.1nm, 587.6nm 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 587.6 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 587.6 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.
Second embodiment
A schematic structural diagram of an optical lens 100 disclosed in the second embodiment of the present application is shown in fig. 3, where the optical lens 100 includes a stop 102, 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, an eighth lens L8, and an infrared filter 90, which are arranged in order from an object side to an image side along an optical axis O.
Further, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, the sixth lens element L6 has positive refractive power, the seventh lens element L7 has positive refractive power, and the eighth lens element L8 has negative refractive power.
Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and 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 both convex at the circumference; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex 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 concave and convex 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, respectively, at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are respectively convex and 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 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 convex on the optical axis O, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are concave and convex on the circumference; the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are both concave at the optical axis O, and the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are respectively concave and convex at the circumference.
Specifically, taking the effective focal length f of the optical lens 100 as 9.07mm, the aperture value FNO of the optical lens 100 as 1.84, the field angle FOV of the optical lens 100 as 75.97 °, and the total length TTL of the optical lens 100 as 11.00mm as examples, other parameters of the optical lens 100 are given in table 3 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, the thickness, and the focal length in table 3 are all mm, and the refractive index, the abbe number, the focal length, etc. in table 3 are all obtained at a reference wavelength (e.g., 587.6 nm).
In the second embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 to the eighth lens element L8 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the foregoing description of the embodiments, which is not repeated herein. Table 4 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 second embodiment.
TABLE 3
TABLE 4
Referring to fig. 4, as can be seen from the (a) spherical aberration diagram, the (B) astigmatism diagram and the (C) distortion diagram in fig. 4, the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 4 (a), fig. 4 (B), and fig. 4 (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.
Third embodiment
A schematic structural diagram of an optical lens 100 disclosed in the third embodiment of the present application is shown in fig. 5, where the optical lens 100 includes a stop 102, 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, an eighth lens L8, and an infrared filter 90, which are arranged in order from an object side to an image side along an optical axis O.
Further, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has negative refractive power, the fifth lens element L5 has negative refractive power, the sixth lens element L6 has positive refractive power, the seventh lens element L7 has positive refractive power, and the eighth lens element L8 has negative refractive power.
Furthermore, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and concave at the paraxial region O, and both the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex 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 concave and convex 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 concave and convex 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, respectively, at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are both 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 concave and convex at the circumference, respectively; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex on the optical axis O, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are concave and convex on the circumference; the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are both concave at the optical axis O, and the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are respectively concave and convex at the circumference.
Specifically, taking as an example that the effective focal length f of the optical lens 100 is 8.66mm, the aperture value FNO of the optical lens 100 is 1.63, the field angle FOV of the optical lens 100 is 76.84 °, and the total length TTL of the optical lens 100 is 10.10mm, the other parameters of the optical lens 100 are given in table 5 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, the thickness, and the focal length in table 5 are all mm, and the refractive index, the abbe number, the focal length, etc. in table 5 are all obtained at a reference wavelength (e.g., 587.6 nm).
In the third embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 to the eighth lens element L8 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the foregoing description of the embodiments, which is not repeated herein. Table 6 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 third embodiment.
TABLE 5
TABLE 6
Referring to fig. 6, as can be seen from the (a) spherical aberration diagram, the (B) astigmatism diagram and the (C) distortion diagram in fig. 6, the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 6 (a), fig. 6 (B), and fig. 6 (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.
Fourth embodiment
A schematic structural diagram of an optical lens 100 disclosed in the fourth embodiment of the present application is shown in fig. 7, where the optical lens 100 includes a stop 102, 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, an eighth lens L8, and an infrared filter 90, which are arranged in order from an object side to an image side along an optical axis O.
Further, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has negative refractive power, the fifth lens element L5 has negative refractive power, the sixth lens element L6 has positive refractive power, the seventh lens element L7 has positive refractive power, and the eighth lens element L8 has negative refractive power.
Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and 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 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 respectively concave and convex at the circumference; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, at the circumference; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are respectively convex and 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 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 convex on the optical axis O, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are concave and convex on the circumference; the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are both concave at the optical axis O, and the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are respectively concave and convex at the circumference.
Specifically, taking the effective focal length f of the optical lens 100 as 9.02mm, the aperture value FNO of the optical lens 100 as 1.88, the field angle FOV of the optical lens 100 as 74.47 °, and the total length TTL of the optical lens 100 as 10.50mm as examples, 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, the thickness, and the focal length in table 7 are all mm, and the refractive index, the abbe number, the focal length, etc. in table 7 are all obtained at a reference wavelength (e.g., 587.6 nm).
In the fourth embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 to the eighth lens element L8 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the foregoing description of the embodiments, which is not repeated herein. Table 8 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 fourth embodiment.
TABLE 7
TABLE 8
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 system 100 are well controlled, so that the optical system 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.
Fifth embodiment
A schematic structural diagram of an optical lens 100 disclosed in the fifth embodiment of the present application is shown in fig. 9, where the optical lens 100 includes a stop 102, 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, an eighth lens L8, and an infrared filter 90, which are arranged in order from an object side to an image side along an optical axis O.
Further, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, the sixth lens element L6 has positive refractive power, the seventh lens element L7 has positive refractive power, and the eighth lens element L8 has negative refractive power.
Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are respectively convex and 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 concave and convex 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 concave and convex 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, respectively, at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex, respectively, 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 convex on the optical axis O, and the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are concave and convex on the circumference; the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are respectively convex and concave at the optical axis O, and the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are respectively concave and convex at the circumference.
Specifically, taking as an example that the effective focal length f of the optical lens 100 is 8.52mm, the aperture value FNO of the optical lens 100 is 2.15, the field angle FOV of the optical lens 100 is 77.45 °, and the total length TTL of the optical lens 100 is 10.00mm, the other parameters of the optical lens 100 are given in table 9 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, the thickness, and the focal length in table 9 are all mm, and the refractive index, the abbe number, the focal length, etc. in table 9 are all obtained at a reference wavelength (e.g., 587.6 nm).
In the fifth embodiment, the object-side surface and the image-side surface of any one of the first lens element L1 to the eighth lens element L8 are aspheric, and the method for calculating the surface shape x of each aspheric lens can be found in the description of the foregoing embodiments, which is not repeated herein. Table 10 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 fifth embodiment.
TABLE 9
Watch 10
Referring to fig. 10, as can be seen from the (a) spherical aberration diagram, the (B) astigmatism diagram and the (C) distortion diagram of fig. 10, the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 10 (a), fig. 10 (B), and fig. 10 (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 table 11, table 11 summarizes the ratios of the relations in the first embodiment to the fifth embodiment of the present application.
TABLE 11
| Relation/embodiment | First embodiment | Second embodiment | Third embodiment | Fourth embodiment | Fifth embodiment |
| 1.62≤f/EPD≤2.16 | 1.843 | 1.837 | 1.629 | 1.880 | 2.153 |
| 1.3＜TTL/ImgH＜1.6 | 1.432 | 1.528 | 1.402 | 1.458 | 1.389 |
| 1＜SD11/SD31＜1.2 | 1.051 | 1.110 | 1.077 | 1.063 | 1.031 |
| 0<|f/f4|≤0.30 | 0.276 | 0.065 | 0.087 | 0.122 | 0.060 |
| 0<|f6/R61|＜5 | 2.536 | 4.167 | 1.420 | 2.047 | 0.148 |
| ImgH is more than or equal to 7.2, unit: mm is | 7.401 | 7.201 | 7.204 | 7.202 | 7.200 |
| 0.8<R22/R31＜4 | 3.532 | 1.369 | 1.166 | 1.128 | 0.885 |
| 1≤(CT4+T45)/(CT5+CT6)≤1.5 | 1.028 | 1.070 | 1.153 | 1.471 | 1.071 |
| 0≤|R81-R82|/|R81+R82|＜5 | 0.088 | 2.768 | 2.896 | 4.355 | 0.906 |
Referring to fig. 11, the present application further discloses a camera module 200, wherein the camera module 200 includes an image sensor 201 and the optical lens 100 as described in any of the first to fifth embodiments of the 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 design and shooting with a large aperture and a large image plane, the resolution of the camera module can be improved, and the imaging effect of the camera module can be improved. 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. 12, 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 has the characteristics of a large aperture and an oversized image plane while satisfying the miniaturization design, and the imaging effect of the electronic device can be effectively improved. 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 (10)
1. An optical lens includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element, which are disposed in order from an object side to an image side along an optical axis;
the first lens element with positive refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;
the second lens element with negative refractive power has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region;
the third lens element with positive refractive power has a convex object-side surface at paraxial region;
the fourth lens element with refractive power has a concave object-side surface at paraxial region;
the fifth lens element with negative refractive power has a concave object-side surface at a paraxial region thereof and a convex image-side surface at a paraxial region thereof;
the sixth lens element with positive refractive power;
the seventh lens element with refractive power has a convex object-side surface at paraxial region;
the eighth lens element with negative refractive power has a concave image-side surface at a paraxial region;
the optical lens satisfies the following relation:
1.62≤f/EPD≤2.16；
wherein f is an effective focal length of the optical lens, and EPD is an entrance pupil diameter of the optical lens.
2. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
1.3＜TTL/ImgH＜1.6；
ImgH≥7.2mm；
wherein, TTL is a distance on an optical axis from an object side surface of the first lens element of the optical lens to an imaging surface of the optical lens, and ImgH is a radius of a maximum effective imaging circle of the optical lens.
3. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
1＜SD11/SD31＜1.2；
wherein SD11 is the maximum effective radius of the object side surface of the first lens, and SD31 is the maximum effective radius of the object side surface of the third lens.
4. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
0<|f/f4|≤0.30；
wherein f4 is the focal length of the fourth lens.
5. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
0<|f6/R61|＜5；
wherein f6 is a focal length of the sixth lens, and R61 is a radius of curvature of an object-side surface of the sixth lens at the optical axis.
6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
0.8<R22/R31＜4；
wherein R22 is a radius of curvature of an image-side surface of the second lens element at the optical axis, and R31 is a radius of curvature of an object-side surface of the third lens element at the optical axis.
7. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
1≤(CT4+T45)/(CT5+CT6)≤1.5；
wherein CT4 is a thickness of the fourth lens element on the optical axis, T45 is a distance between the fourth lens element and the fifth lens element on the optical axis, CT5 is a thickness of the fifth lens element on the optical axis, and CT6 is a thickness of the sixth lens element on the optical axis.
8. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
0≤|R81-R82|/|R81+R82|＜5；
wherein R81 is a radius of curvature of an object-side surface of the eighth lens element at the optical axis, and R82 is a radius of curvature of an image-side surface of the eighth lens element at the optical axis.
9. A camera module, comprising an optical lens according to any one of claims 1 to 8 and an image sensor, wherein the image sensor is disposed on an image side of the optical lens.
10. An electronic device comprising a housing and the camera module of claim 9, wherein the camera module is disposed on the housing.
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