CN113484982B - Optical lens, camera module and electronic equipment - Google Patents
Optical lens, camera module and electronic equipment Download PDFInfo
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- CN113484982B CN113484982B CN202110669395.4A CN202110669395A CN113484982B CN 113484982 B CN113484982 B CN 113484982B CN 202110669395 A CN202110669395 A CN 202110669395A CN 113484982 B CN113484982 B CN 113484982B
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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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- Optics & Photonics (AREA)
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Abstract
The invention discloses an optical lens, an image pickup module and electronic equipment, wherein the optical lens comprises the following components 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 and a concave image-side surface at a paraxial region; the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface at a paraxial region; the third lens element with positive refractive power has a convex object-side surface at a paraxial region; the object side surface of the fourth lens is a concave surface 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 a 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 less 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 plane, and can realize high-quality imaging.
Description
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
With the development of technology, the specifications of electronic products are changed day by day, and the optical lenses in key parts of the electronic products are more diversified, so that the electronic products are light and thin, have good imaging quality, and are designed with large aperture and large image plane. The current market demand for thin optical lenses and designs for achieving a desired aperture value is increasing, but how to increase the aperture value of an optical lens and shorten the lens length while maintaining good imaging quality is a great challenge in the industry.
Disclosure of Invention
The embodiment of the invention discloses an optical lens, an imaging module and electronic equipment, which can realize miniaturization, simultaneously have the characteristics of large aperture and ultra-large image surface and improve the imaging effect of the optical lens.
In order to achieve the above object, a first aspect of 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 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 and a concave image-side surface at a paraxial region;
The second lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the third lens element with positive refractive power has a convex object-side surface at a paraxial region;
the fourth lens element with refractive power has a concave object-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 convex image-side surface at a paraxial region;
the sixth lens element with positive refractive power;
the seventh lens element with refractive power has a convex object-side surface at a 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 the effective focal length of the optical lens, and EPD is the entrance pupil diameter of the optical lens.
In the optical lens provided by the application, in order to obtain a high-quality imaging effect, the refractive power and the surface shape of the eight lenses are reasonably configured, namely, the total length of the optical lens can be shortened when the first lens is provided with positive refractive power, the second lens is provided with negative refractive power and the third lens is provided with positive refractive power, and meanwhile, the chromatic aberration of the optical lens can be balanced. The first lens and the second lens are of convex-concave structures at the position of the paraxial region, and the object side surface of the third lens is of convex surface at the position of the paraxial region. The concave surface-shaped configuration of the object-side surface of the fourth lens element at the paraxial region can provide a powerful condition for gradually diffusing light rays 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 having 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 higher-order aberrations. After the incident light passes through the eighth lens with negative refractive power, the incident light is converged on the imaging surface of the optical lens at a smaller 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 application satisfies the relation: 1.62 is less than or equal to f/EPD is less than or equal to 2.16, enough light incoming quantity of the optical lens can be ensured, dark corners on the periphery of an image sensor are avoided, shooting effect in a dark environment is improved, the resolution limit can be improved by a large aperture, and the imaging quality of the optical lens is improved while the light and thin structure and miniaturization of the optical lens are ensured.
As an alternative implementation manner, 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 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, and ImgH is the radius (i.e. half-image height) of the maximum effective imaging circle of the optical lens element.
The half image height determines the size of the image sensor, and the larger the half image height is, the larger the supportable maximum image sensor size is, when the relation is satisfied, the optical lens can support the high-pixel image sensor so as to improve the resolution of the optical lens and obtain a high-quality imaging effect. When the total length of the optical lens is reduced, the total length of the optical lens can be compressed, thereby making the optical lens easy to be made ultra-thin and miniaturized.
As an alternative implementation manner, 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 relation 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 easy to be realized, and meanwhile, the image plane illuminance is improved, so that the light deflection angle is controlled in a proper range, and the sensitivity of the head module 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:
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 for adjusting the overall refractive power of the optical lens element, so that the fourth lens element and the first lens element, the second lens element and the third lens element in front thereof form a symmetrical structure, thereby balancing the distortion of the front lens assembly comprising the four lens elements. Meanwhile, the higher-order aberration caused by overlarge refractive index can be avoided by meeting the relation, and the imaging quality of the optical lens is improved.
As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation:
0<|f6/R61|＜5；
where f6 is a focal length of the sixth lens element, and R61 is a radius of curvature of the object-side surface of the sixth lens element at the optical axis.
When the above relation is satisfied, the sixth lens element includes at least one inflection point, so as to improve the aberration problem of the optical lens element and enhance the resolution of the optical lens element.
As an alternative implementation manner, 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 the image side surface of the second lens element at the optical axis, and R31 is a radius of curvature of the object side surface of the third lens element at the optical axis.
When the above relation is satisfied, the curvature radius of the image side surface of the second lens element at the optical axis and the curvature radius of the object side surface of the third lens element at the optical axis can cooperate with each other, so that the reflection effect of light on the lens surface can be reduced, the illuminance and image quality of the optical lens can be improved, and the influence of stray light can be avoided.
As an alternative implementation manner, 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 the thickness of the fourth lens element on the optical axis, T45 is the distance between the fourth lens element and the fifth lens element on the optical axis, CT5 is the thickness of the fifth lens element on the optical axis, and CT6 is the thickness of the sixth lens element on the optical axis.
Because the thickness of each lens and the distance between the lenses directly influence the difficulty of forming and manufacturing the optical lens, when the above relation is satisfied, the thicknesses of the fourth lens, the fifth lens and the sixth lens can be appropriate, the distance between the lenses is reasonable, the structural compactness of the optical lens can be effectively improved, and the forming and the assembling of each lens are facilitated.
As an alternative implementation manner, 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 the object side surface of the eighth lens element at the optical axis, and R82 is a radius of curvature of the image side surface of the eighth lens element at the optical axis.
When the above relation is satisfied, it is advantageous to correct the aberration generated by the optical lens under the condition of a large aperture, so that the refractive power of the optical lens in the direction perpendicular to the optical axis is uniformly configured, and the distortion and aberration generated by the front lens group (for example, the first lens to the seventh lens located before the eighth lens) can be greatly corrected. And meanwhile, the above relational expression is satisfied, so that excessive bending of the surface shape of the eighth lens can be avoided, and the eighth lens can be easily molded and manufactured.
In a second aspect, the present invention discloses an image capturing module, where the image capturing module includes an image sensor and the optical lens according to the first aspect, and the image sensor is disposed on an image side of the optical lens.
The camera module with the optical lens not only can realize miniaturized design, but also can realize shooting requirements of a large aperture and a large image plane, can improve the resolution of the camera module, and improves the imaging effect of the camera module.
In a third aspect, the present application discloses an electronic device, which includes a housing and an image capturing module set according to the second aspect, where the image capturing module set is disposed in the housing.
The electronic equipment with the camera module has the characteristics of large aperture and ultra-large image surface while realizing the miniaturization design, and can effectively improve the imaging effect of the electronic equipment.
Compared with the prior art, the application has the beneficial effects that:
according to the optical lens, the image capturing module and the electronic device provided by the embodiment of the application, eight lenses with refractive power are adopted, and the refractive power and the surface shape of each lens are reasonably configured, namely, when the first lens is provided with positive refractive power, the second lens is provided with negative refractive power and the third lens is provided with positive refractive power, the total length of the optical lens can be shortened, and meanwhile, the chromatic aberration of the optical lens can be balanced. The first lens and the second lens are of convex-concave structures at the paraxial region, and the object side surface of the third lens is of convex surface at the paraxial region. The concave surface-shaped configuration of the object-side surface of the fourth lens element at the paraxial region can provide a powerful condition for gradually diffusing light rays 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 having 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 higher-order aberrations. After passing through the eighth lens with negative refractive power, the incident light rays are converged on the imaging surface of the optical lens at a smaller 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 application satisfies the relation: 1.62 is less than or equal to f/EPD is less than or equal to 2.16, enough light entering quantity of the optical lens can be ensured, dark angles around the image sensor are avoided, shooting effect in dark environment is improved, the resolution limit can be improved by large aperture, and the imaging quality of the optical lens is improved while the light and thin structure and miniaturization of the optical lens are ensured by reasonably configuring the refractive power of each lens.
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 light ray spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of an optical lens according to a 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 light ray spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of an optical lens according to 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 light ray spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of an optical lens according to 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 light ray spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of an optical lens according to 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 light ray spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of an optical lens according to 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.
Icon: o, optical axis; l1, a first lens; 11. an object side surface of the first lens; 12. an image side surface of the first lens; l2, a second lens; 21. an object side of the second lens; 22. an image side surface of the second lens; l3, a third lens; 31. an object side surface of the third lens; 32. an image side surface of the third lens; l4, a fourth lens; 41. an object side surface of the fourth lens; 42. an image side surface of the fourth lens; l5, a fifth lens; 51. an object side surface of the fifth lens; 52. an image side surface of the fifth lens; l6, sixth lens; 61. an object side surface of the sixth lens; 62. an image side surface of the sixth lens; l7, seventh lens; 71. an object side surface of the seventh lens; 72. an image side surface of the seventh lens; l8, eighth lens; 81. an object side surface of the eighth lens; 82. an image side surface of the eighth lens; 90. an infrared filter; 100. an optical lens; 101. an imaging surface; 102. a diaphragm; 200. a camera module; 201. an image sensor; 300. an electronic device.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present invention, 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 invention 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 application 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, 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 sequentially disposed from an object side to an image side along an optical axis O. The first lens element L1 with positive 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 or negative refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive or negative refractive power, the seventh lens element L7 with positive or negative refractive power, and the eighth lens element L8 with negative refractive power. During imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 in order from the object side of the first lens L1, and finally is imaged on the imaging 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 a 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 a 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 a 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 a 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 at the optical axis O, and the image-side surface 62 of the sixth lens element L6 is convex or concave at 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 has a convex or concave surface at the optical axis O, and the image-side surface 82 of the eighth lens element L8 has a concave surface at 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 be glass lenses, so that the temperature sensitivity of the optical lens 100 may be reduced while having good optical effects.
In addition, it can be appreciated that in other embodiments, when the optical lens 100 is applied to an electronic device such as a smart phone 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 can be plastic, so that the optical lens 100 can be made thinner and lighter and can be easily processed into complex lens surfaces.
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 will be appreciated that in other embodiments, the diaphragm 102 may be disposed between other lenses, and the setting is adjusted according to the actual situation, which is not particularly limited in this embodiment.
In some embodiments, the optical lens 100 further includes an infrared filter 90, and the infrared filter 90 is disposed between the eighth lens L8 and the imaging surface 101 of the optical lens 100. The infrared filter 90 is selected, 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 to be understood that the infrared filter 90 may be made of an optical glass coating, or may be made of a colored glass, or the infrared filter 90 made of other materials 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 less 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 relation, the optical lens 100 can be ensured to have enough light entering quantity, so as to avoid the occurrence of a dark angle around the image sensor, further, when f/EPD is less than or equal to 1.7, enough incident light can effectively improve the shooting effect in a dark environment, and the large aperture can reduce the size of Ai Liban, thereby improving the resolution limit, and better improving the imaging quality 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 between the object side surface 11 of the first lens element L1 of the optical lens 100 and the imaging surface 101 of the optical lens 100 on the optical axis O, and ImgH is a radius (i.e. half image height) of a maximum effective imaging circle of the optical lens 100. Since the half image height determines the size of the image sensor, the larger the half image height is, the larger the maximum image sensor size that can be supported is, and when the above relation is satisfied, the optical lens 100 can be made to support a high-pixel image sensor; as the total length of the optical lens 100 decreases, the total length of the optical lens 100 can be compressed, thereby making the optical lens 100 easy to be made ultra-thin and miniaturized.
Further, in some embodiments, the optical lens 100 satisfies the following relationship: imgH is more than or equal to 7.2mm;
where 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 can have a larger imaging surface 101, and can be matched with an image sensor with a larger size, 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;
the SD11 is the maximum effective radius of the object-side surface 11 of the first lens element L1, and the SD31 is the maximum effective radius of the object-side surface 31 of the third lens element L3. When the above relation is satisfied, the sizes of the head modules (i.e., the first lens L1, the second lens L2 and the third lens L3) of the optical lens 100 can be compressed, so that the small-head design of the optical lens 100 can be easily realized, and the image plane illuminance can be improved, so that the light deflection angle can be controlled within a proper range, and the sensitivity of the head module of the optical lens 100 can be reduced. When the ratio is lower than the lower limit, the maximum effective radius of the object-side surface 31 of the third lens element L3 is significantly larger than the maximum effective radius of the object-side surface 11 of the first lens element L1 for SD11, such that it is difficult for the marginal ray to control the aberration and the image-plane illuminance. When the ratio exceeds the upper limit, the deflection angle of the marginal ray is excessively 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;
wherein f4 is the focal length of the fourth lens L4. The fourth lens element L4 can provide positive refractive power or negative refractive power for adjusting the overall refractive power of the optical lens element 100, such that the fourth lens element L4 and the front first lens element L1, the second lens element L2 and the third lens element L3 form a symmetrical structure, thereby balancing the distortion of the front lens assembly. Meanwhile, the higher-order aberration caused by the overlarge refractive index can be avoided by meeting the above relation, 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 a focal length of the sixth lens element L6, and R61 is a radius of curvature of the object-side surface 61 of the sixth lens element L6 at the optical axis O. When the above relation is satisfied, the sixth lens L6 includes at least one inflection point, so as to improve the aberration problem of the optical lens 100 and enhance the resolution of the optical lens 100.
In some embodiments, the optical lens 100 satisfies the following relationship: R22/R31 is less than 4 and 0.8;
wherein R22 is a radius of curvature of the image side surface 22 of the second lens element L2 at the optical axis O, and R31 is a radius of curvature of the object side surface 31 of the third lens element L3 at the optical axis O. When the above relation is satisfied, the radius of curvature of the image side surface 22 of the second lens element L2 at the optical axis O and the radius of curvature of the object side surface 31 of the third lens element L3 at the optical axis O can cooperate with each other, so as to reduce the reflection effect of light on the lens surface, improve the illuminance and image quality of the optical lens 100, and avoid the parasitic light effect.
In some embodiments, the optical lens 100 satisfies the following relationship: the (CT 4+ T45)/(CT 5+ CT 6) is less than or equal 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. Because the thickness of each lens and the spacing between the lenses directly affect the difficulty in 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 can be made appropriate, and the spacing between the lenses is reasonable, so that the structural compactness of the optical lens 100 can be effectively improved, and the molding and the assembly of each lens are facilitated.
In some embodiments, the optical lens 100 satisfies the following relationship: R81-R82/R81 + R82 < 5;
wherein R81 is a radius of curvature of the object side surface 81 of the eighth lens element L8 at the optical axis O, and R82 is a radius of curvature of the image side surface 82 of the eighth lens element L8 at the optical axis O. When the above-described relation is satisfied, it is advantageous to correct the aberration generated by the optical lens 100 under the large aperture condition, so that the refractive power arrangement of the optical lens in the direction perpendicular to the optical axis O is uniform, and it is possible to greatly correct the distortion and aberration generated by the front lens group (e.g., the first lens L1 to the seventh lens L7 located before the eighth lens L8). Meanwhile, the above relation can be satisfied, so that excessive bending of the surface shape of the eighth lens L8 can be avoided, and the eighth lens L8 can be easily molded and manufactured.
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, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present application, the optical lens 100 includes a diaphragm 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 sequentially disposed from an object side to an image side along an optical axis O.
Further, the first lens element L1 with positive 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, the seventh lens element L7 with negative refractive power, and the eighth lens element L8 with negative refractive power.
Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region O, respectively, and 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 convex and concave at the paraxial region O, respectively, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the peripheral region O, respectively; 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 peripheral region O, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are respectively concave and convex at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are respectively concave and convex at the peripheral region; 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 convex and concave, respectively, at the optical axis O, and the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are convex at the circumference.
Specifically, taking the effective focal length f=9.22 mm of the optical lens 100, the aperture value fno=1.84 of the optical lens 100, the field angle fov=74.45° of the optical lens 100, and the total length ttl=10.60 mm of the optical lens 100 as an example, 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 2 and 3 correspond to the object side surface and the image side surface 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 O. 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 diaphragm 102 in the "thickness" parameter row is the distance between the diaphragm 102 and the vertex of the subsequent surface (the vertex refers to the intersection point 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, when the value is negative, it indicates that the diaphragm 102 is disposed on the right side of the vertex of the subsequent surface, and when the thickness of the diaphragm 102 is positive, the diaphragm 102 is on the left side of the vertex of the subsequent surface. It is understood that the units of Y radius, thickness, and focal length in Table 1 are all mm. And the refractive index, abbe number, focal length, etc. in Table 1 were all obtained at the 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 to the eighth lens L8 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 O direction; c is the curvature of the aspherical surface at the optical axis O, c=1/Y (i.e., paraxial curvature c is the inverse of the radius of curvature Y in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in the first embodiment are given in Table 2 below.
TABLE 1
TABLE 2
Referring to fig. 2 (a), fig. 2 (a) shows the optical spherical aberration diagram of the optical lens 100 in the first embodiment at the wavelengths of 468.1nm, 587.6nm and 656.3 nm. In fig. 2 (a), the abscissa along the X-axis direction represents the focus shift, and the ordinate along 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 587.6nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents focus offset, and the ordinate along the Y-axis direction represents image height in mm. The astigmatism curves represent the meridional imaging plane 101 curvature T and the sagittal imaging plane 101 curvature S, and it can be seen from fig. 2 (B) that at this wavelength, the astigmatism of the optical lens 100 is well compensated.
Referring to fig. 2 (C), fig. 2 (C) is a graph showing a distortion curve of the optical lens 100 at a wavelength of 587.6nm 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), the distortion of the optical lens 100 becomes well corrected at the wavelength of 587.6 nm.
Second embodiment
As shown in fig. 3, a schematic structural diagram of an optical lens 100 according to a second embodiment of the present application, the optical lens 100 includes a diaphragm 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 sequentially disposed from an object side to an image side along an optical axis O.
Further, the first lens element L1 with positive 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, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power.
Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region O, respectively, and the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the peripheral region; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the paraxial region O, respectively, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the peripheral region O, respectively; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the paraxial region O, respectively, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex at the circumferential region; 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 peripheral region O, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are respectively concave and convex at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are respectively concave and convex at the peripheral region; 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 at 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 at the circumference; the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are 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 concave and convex at the circumference.
Specifically, taking the effective focal length f=9.07 mm of the optical lens 100, the aperture value fno=1.84 of the optical lens 100, the field angle fov= 75.97 of the optical lens 100, and the total length ttl=11.00 mm of the optical lens 100 as examples, other parameters of the optical lens 100 are given in table 3 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius, thickness, and focal length of Y in table 3 are all mm, and the refractive index, abbe number, focal length, etc. in table 3 are all obtained at the 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 element can be obtained by the above description of the embodiments, which is not repeated herein. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in the second embodiment are given in Table 4 below.
TABLE 3 Table 3
TABLE 4 Table 4
Referring to fig. 4, as shown 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 the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 4 (a), fig. 4 (B), and fig. 4 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C), and the description thereof will not be repeated here.
Third embodiment
As shown in fig. 5, a schematic structural diagram of an optical lens 100 according to a third embodiment of the present application, the optical lens 100 includes a diaphragm 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 sequentially disposed from an object side to an image side along an optical axis O.
Further, the first lens element L1 with positive 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 negative refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive refractive power, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power.
Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region O, respectively, and 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 convex and concave at the paraxial region O, respectively, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the peripheral region O, respectively; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the paraxial region O, respectively, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the peripheral region O, respectively; 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 peripheral region O, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are respectively concave and convex at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are respectively concave and convex at the peripheral region; the object side surface 61 and the image side surface 62 of the sixth lens element L6 are 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 thereof; the object-side surface 71 and the image-side surface 72 of the seventh lens element L7 are convex at 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 at the circumference; the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are 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 concave and convex at the circumference.
Specifically, taking the effective focal length f=8.66 mm of the optical lens 100, the aperture value fno=1.63 of the optical lens 100, the field angle fov=76.84° of the optical lens 100, and the total length ttl=10.10 mm of the optical lens 100 as an example, other parameters of the optical lens 100 are given in table 5 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the Y radius, thickness, and focal length in table 5 are all mm, and the refractive index, abbe number, focal length, etc. in table 5 are all obtained at the 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 element can be obtained by the above description of the embodiments, which is not repeated herein. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in the third embodiment are given in Table 6 below.
TABLE 5
TABLE 6
Referring to fig. 6, as can be seen from the (a) optical spherical aberration chart, (B) optical astigmatic chart, and (C) distortion chart in fig. 6, the longitudinal spherical aberration, astigmatic aberration, and distortion of the optical system 100 are well controlled, so that the optical system 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 6 (a), 6 (B), and 6 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B), and 2 (C), and the description thereof will be omitted here.
Fourth embodiment
As shown in fig. 7, a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present application, the optical lens 100 includes a diaphragm 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 sequentially disposed from an object side to an image side along an optical axis O.
Further, the first lens element L1 with positive 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 negative refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive refractive power, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power.
Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region O, respectively, and the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the peripheral region; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the paraxial region O, respectively, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the peripheral region O, respectively; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the paraxial region O, respectively, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the peripheral region O, respectively; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are 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 concave and convex at the circumference thereof; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are respectively concave and convex at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are respectively concave and convex at the peripheral region; 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 at 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 at the circumference; the object-side surface 81 and the image-side surface 82 of the eighth lens element L8 are 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 concave and convex at the circumference.
Specifically, taking the effective focal length f=9.02 mm of the optical lens 100, the aperture value fno=1.88 of the optical lens 100, the field angle fov=74.47° of the optical lens 100, and the total length ttl=10.50 mm of the optical lens 100 as an example, other parameters of the optical lens 100 are given in table 7 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius, thickness, and focal length of Y in table 7 are all mm, and the refractive index, abbe number, focal length, etc. in table 7 are all obtained at the 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 element can be obtained by the above description of the embodiments, which is not repeated herein. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in the fourth embodiment are given in Table 8 below.
TABLE 7
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TABLE 8
Referring to fig. 8, as can be seen from the (a) optical spherical aberration chart, (B) optical astigmatic chart, and (C) distortion chart in fig. 8, the longitudinal spherical aberration, astigmatic aberration, and distortion of the optical system 100 are well controlled, so that the optical system 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 8 (a), 8 (B), and 8 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B), and 2 (C), and the description thereof will be omitted here.
Fifth embodiment
As shown in fig. 9, a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present application, the optical lens 100 includes a diaphragm 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 sequentially disposed from an object side to an image side along an optical axis O.
Further, the first lens element L1 with positive 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, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power.
Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region O, respectively, and the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the peripheral region; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the paraxial region O, respectively, and the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the peripheral region O, respectively; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the paraxial region O, respectively, and the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the peripheral region O, respectively; 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 peripheral region O, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are respectively concave and convex at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are respectively concave and convex at the peripheral region; 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 at 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 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 respectively concave and convex at the circumference.
Specifically, taking the effective focal length f=8.52 mm of the optical lens 100, the aperture value fno=2.15 of the optical lens 100, the field angle fov=77.45° of the optical lens 100, and the total length ttl=10.00 mm of the optical lens 100 as an example, other parameters of the optical lens 100 are given in table 9 below. And the definition of each parameter can be derived from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the radius, thickness, and focal length of Y in table 9 are all mm, and the refractive index, abbe number, focal length, etc. in table 9 are all obtained at the 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 element can be obtained by the above description of the embodiments, which is not repeated herein. The following table 10 gives the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18 and a20 that can be used for each aspherical mirror in the fifth embodiment.
TABLE 9
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Table 10
Referring to fig. 10, as can be seen from the (a) optical spherical aberration chart, (B) optical astigmatic chart, and (C) distortion chart in fig. 10, the longitudinal spherical aberration, astigmatic aberration, and distortion of the optical system 100 are well controlled, so that the optical system 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 10 (a), 10 (B), and 10 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B), and 2 (C), and the description thereof will be omitted here.
Referring to table 11, table 11 is a summary of the ratios of the relationships in the first to fifth embodiments 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 (mm) | 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 an image capturing module 200, wherein the image capturing module 200 includes an image sensor 201 and the optical lens 100 according to any one of the first to fifth embodiments of the first aspect, and the image sensor 201 is disposed on 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. It can be appreciated that the image capturing module 200 with the optical lens 100 has all the technical effects of the optical lens 100, that is, the image capturing module 200 can achieve the shooting requirements of a large aperture and a large image plane while meeting the miniaturization design, so that the resolution of the image capturing module can be improved, and the imaging effect of the image capturing module can be improved. Since the above technical effects are described in detail in the embodiment of the optical lens 100, the description thereof is omitted here.
Referring to fig. 12, the application further discloses an electronic device 300, where the electronic device 300 includes a housing and the camera module 200, and the camera module 200 is disposed on 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, etc. It can be appreciated that the electronic device 300 having the image capturing module 200 also has all the technical effects of the optical lens 100. That is, the electronic device 300 has the characteristics of large aperture and ultra-large image surface while meeting the miniaturization design, and can effectively improve the imaging effect of the electronic device. Since the above technical effects are described in detail in the embodiment of the optical lens 100, the description thereof is omitted here.
The optical lens, the camera module and the electronic device disclosed in the embodiments of the present application are described in detail, and specific examples are applied to the description of the principles and the implementation modes of the present application, and the description of the above embodiments is only used to help understand the optical lens, the camera module, the electronic device and the core ideas thereof; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present application, the present disclosure should not be construed as limiting the present application in summary.
Claims (7)
1. An optical lens, characterized in that the optical lens has eight lens elements with refractive power, and the eight lens elements include 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 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 and a concave image-side surface at a paraxial region;
the second lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the third lens element with positive refractive power has a convex object-side surface at a paraxial region;
the fourth lens element with refractive power has a concave object-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 convex image-side surface at a paraxial region;
the sixth lens element with positive refractive power;
the seventh lens element with refractive power has a convex object-side surface at a paraxial region, and the fourth lens element and the seventh lens element with negative refractive power are different;
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 2.16,1, SD11/SD31 is less than 1.2, f6/R61 is more than or equal to 0 and less than or equal to 5, and (CT 4+ T45)/(CT 5+ CT 6) is more than or equal to 1 and less than or equal to 1.5;
wherein f is an effective focal length of the optical lens, EPD is an entrance pupil diameter of the optical lens, SD11 is a maximum effective radius of an object side surface of the first lens, SD31 is a maximum effective radius of an object side surface of the third lens, f6 is a focal length of the sixth lens, R61 is a radius of curvature of an object side surface of the sixth lens at the optical axis, CT4 is a thickness of the fourth lens on the optical axis, T45 is a distance between the fourth lens and the fifth lens on the optical axis, CT5 is a thickness of the fifth lens on the optical axis, and CT6 is a thickness of the sixth lens on the optical axis.
2. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:
1.3＜TTL/ImgH＜1.6；
ImgH≥7.2mm；
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, and ImgH is the radius of the maximum effective imaging circle of the optical lens element.
3. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:
0<|f/f4|≤0.30；
wherein f4 is the focal length of the fourth lens.
4. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:
0.8<R22/R31＜4；
wherein R22 is a radius of curvature of the image side surface of the second lens element at the optical axis, and R31 is a radius of curvature of the object side surface of the third lens element at the optical axis.
5. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:
0≤|R81-R82|/|R81+R82|＜5；
wherein R81 is a radius of curvature of the object side surface of the eighth lens element at the optical axis, and R82 is a radius of curvature of the image side surface of the eighth lens element at the optical axis.
6. An imaging module comprising an image sensor and the optical lens of any one of claims 1-5, wherein the image sensor is disposed on an image side of the optical lens.
7. An electronic device, comprising a housing and the camera module of claim 6, wherein the camera module is disposed on the housing.
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| CN112034599A (en) * | 2020-10-13 | 2020-12-04 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN114217418A (en) * | 2021-12-28 | 2022-03-22 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN114740593B (en) * | 2022-03-07 | 2023-09-05 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
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