CN115407488A - Optical lens, camera module and electronic equipment - Google Patents

Abstract

The invention discloses an optical lens, a camera module and electronic equipment. The optical lens includes 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 The first lens has positive refractive power, the second lens has negative refractive power, the third lens to the sixth lens all have refractive power, the seventh lens has positive refractive power, the eighth lens has negative refractive power, and the optical lens satisfies the following Relational expression: 1.63<f/D<1.7, 1.0<Imgh/f<1.1; wherein, f is the focal length of the optical lens, D is the entrance pupil diameter of the optical lens, and Imgh is the largest on the imaging surface of the optical lens The radius of the effective imaging circle. The optical lens, camera module and electronic equipment provided by the present invention can realize the miniaturization design of the optical lens while improving the image quality of the optical lens, improving the resolution and definition of the optical lens, and achieving high-pixel shooting effects.

Description

Optical lens, camera module and electronic equipment

technical field

The invention relates to the technical field of optical imaging, in particular to an optical lens, a camera module and electronic equipment.

Background technique

In recent years, with the upgrading of technology, consumers have higher and higher requirements for the imaging quality of portable electronic devices represented by mobile phones, which makes the camera modules mounted on portable electronic devices face more and more challenges. On the one hand, the development trend of portable electronic devices is becoming thinner and lighter, which requires further compression of the optical lens in the axial dimension; on the other hand, it is necessary to ensure that the optical lens meets the miniaturization design while taking into account higher imaging quality. Therefore, how to configure the number of lenses in the optical lens, refractive power, surface shape, etc., so that the optical lens can achieve a miniaturized design while maintaining good imaging quality is still a technical problem that needs to be solved urgently in the field of optical imaging technology.

Contents of the invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can improve the image quality of the optical lens while realizing the miniaturization design of the optical lens, improve the resolution and definition of the optical lens, and achieve high-pixel Shooting effect.

In order to achieve the above object, in the first aspect, the present invention discloses an optical lens. The optical lens has eight lenses in total, and the eight lenses are sequentially a first lens and a second lens along the optical axis from the object side to the image side. , the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens;

The first lens has positive refractive power, the object side of the first lens is convex at the near optical axis, and the image side of the first lens is concave at the near optical axis;

The second lens has a negative refractive power, the object side of the second lens is convex at the near optical axis, and the image side of the second lens is concave at the near optical axis;

The third lens has refractive power, and the image side of the third lens is convex at the near optical axis;

The fourth lens has a refractive power, and the object side of the fourth lens is concave at the near optical axis;

The fifth lens has refractive power, the object side of the fifth lens is concave at the near optical axis, and the image side of the fifth lens is convex at the near optical axis;

The sixth lens has refractive power, and the image side of the sixth lens is concave at the near optical axis;

The seventh lens has positive refractive power, and the object side of the seventh lens is convex at the near optical axis;

The eighth lens has a negative refractive power, the object side of the eighth lens is convex at the near optical axis, and the image side of the eighth lens is concave at the near optical axis;

The optical lens satisfies the following relationship:

1.63<f/D<1.7;

1.0<Imgh/f<1.1;

Wherein, f is the focal length of the optical lens, D is the entrance pupil diameter of the optical lens, and Imgh is the radius of the maximum effective imaging circle on the imaging surface of the optical lens, that is, the half image height of the optical lens.

In the optical lens provided by the present application, the first lens has a strong positive refractive power, and the surface shape of the object side protruding at the optical axis and the image side concave at the near optical axis can effectively utilize the optical lens. space, so as to realize the miniaturization of the optical lens, and at the same time, it is also beneficial to ensure that the first lens has sufficient light gathering ability. The second lens can provide negative refractive power for the optical lens, which is beneficial to expand the width of the light beam, so that the light rays with large angles refracted and converged by the first lens can be effectively widened, and the optical performance of the optical lens can be improved. The first lens with refractive power is beneficial to correct the axial spherical aberration of the optical lens. The convex surface design of the image side of the third lens at the near optical axis and the concave surface design of the object side of the fourth lens at the optical axis can well correct spherical aberration. The object side and image side of the fifth lens are concave and convex respectively at the optical axis, which is beneficial to reduce the influence of advanced astigmatism on the optical lens; the image side of the sixth lens is concave at the near optical axis and the object of the seventh lens The side is convex at the near optical axis, which can effectively correct the field curvature and distortion of the optical lens. The positive refractive power provided by the seventh lens and the negative refractive power of the eighth lens are beneficial to correct the coma and field curvature of the optical lens; The convex-concave surface design of the object side and image side of the eight lenses at the optical axis can reduce the assembly sensitivity of the optical lens, which is beneficial to the engineering manufacture of the optical lens.

That is to say, by selecting an appropriate number of lenses and rationally configuring the refractive power and surface shape of each lens, the miniaturization design of the optical lens can be realized, and the detailed information of the object can be better captured, and the ability of the optical lens to capture the object can be improved. Detail ability, improve the image quality of the optical lens, improve the resolution and imaging clarity of the optical lens, so that the optical lens can have a better imaging effect, so as to meet people's high-definition imaging requirements for the optical lens; and also make the optical lens meet The following relationship: 1.6<f/D<1.7, and 1.0<Imgh/f<1.1, can reasonably configure the focal length of the optical lens, the diameter of the entrance pupil of the optical lens and the half-image height of the optical lens, which is conducive to making the optical lens have a higher A large aperture and a small total optical length can also ensure the wide-angle characteristics of the optical lens, which is conducive to increasing the light entering range of the field of view of the optical lens, increasing the light beam entering the optical lens, so that the optical lens has a larger The amount of incoming light ensures that enough light can converge on the imaging surface to improve the brightness of the image, thereby making the captured image clearer and achieving a high-definition wide-angle shooting effect; and a larger amount of incoming light is also convenient for good capture The details of the subject are conducive to obtaining a larger field of view to achieve a wide-angle design while reducing the deflection angle of the outgoing light, thereby reducing vignetting, suppressing distortion, and improving the imaging resolution of the optical lens. It can also have better optical performance when used in dark light environments such as cloudy days and rainy days, that is, the optical lens of the present application can shoot high-quality images of low-brightness object space scenes such as night scenes and starry sky. In addition, the larger diameter of the entrance pupil is also conducive to large-angle light entering the optical lens, so that the optical lens has a large field of view range, which can obtain sufficient object space information and improve imaging quality. And when the upper limit of the above relationship is exceeded, it is easy to cause the aperture of the optical lens to be too small, which is not conducive to obtaining sufficient light input in a dark shooting environment, resulting in a decrease in the brightness of the imaging surface and low imaging quality; When the lower limit of the relational expression, the focal length of the optical lens is too small, it is difficult to meet the design requirements of the field of view range of the optical lens, and it is impossible to obtain sufficient object space information, resulting in the loss of imaging information and affecting the shooting quality of the optical lens.

As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relational expression: 1.1<TTL/Imgh<1.21; wherein, TTL is the object side surface of the first lens to The distance of the imaging surface of the optical lens on the optical axis, i.e. the optical total length of the optical lens, Imgh is the radius of the maximum effective imaging circle on the imaging surface of the optical lens, i.e. the half image height of the optical lens. When the above relationship is satisfied, by controlling the ratio of the total optical length of the optical lens to the half-image height within a reasonable range, the optical lens can be effectively controlled on the premise that the optical lens has a large field of view and image surface. The overall length of the optics makes the structure of the optical lens more compact and has the characteristics of ultra-thin, which meets the design requirements of miniaturization, so that the optical lens can be better mounted on thin and light electronic equipment, and at the same time, it can also make the optical lens compatible with large size The photosensitive chip is conducive to improving the imaging quality of electronic equipment. And when the upper limit of the above-mentioned relational expression is exceeded, the optical total length of the optical lens is too large, resulting in an increase in the thickness of the optical lens in the direction of the optical axis, which is not conducive to the light, thin and miniaturized design of the optical lens. At the same time, the size of the imaging surface of the optical lens If it is too small, vignetting phenomenon will easily occur, resulting in the loss of imaging information and reducing the imaging quality; when it is lower than the lower limit of the above relation, the total optical length of the optical lens is too small, which is not conducive to lens arrangement and reduces the assembly efficiency of the optical lens.

As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 2.7<|R7/f|<2.8; wherein, R7 is the object of the fourth lens The radius of curvature of the side on the optical axis. By satisfying the above relationship, the ratio of the radius of curvature of the object side of the fourth lens to the focal length of the optical lens can be controlled within a certain range, so that the refractive power of the fourth lens can be controlled within a reasonable range, so that the optical lens can be effectively balanced spherical aberration, so that the optical lens has good imaging quality. And when it is lower than the lower limit of the above conditional formula, the absolute value of the radius of curvature of the object side of the fourth lens at the optical axis is too small, resulting in the surface shape of the fourth lens at the near optical axis being too curved, increasing the fourth lens The sensitivity is not conducive to the engineering manufacture of the fourth lens, or the focal length of the optical lens is too long to compress the total optical length of the optical lens, resulting in an increase in the volume of the optical lens, which is not conducive to the optical lens to meet the miniaturization design requirements; and when When the upper limit of the above conditional expression is exceeded, the absolute value of the radius of curvature of the object side of the fourth lens at the optical axis is too large, resulting in the surface shape of the fourth lens at the near optical axis being too gentle, and it is difficult to fully correct astigmatism, field curvature and distortion.

As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relational expression: 5.8<|R6/f|<6.2; wherein, R6 is the image of the third lens The radius of curvature of the side on the optical axis. By satisfying the above relationship, the ratio of the radius of curvature of the image side of the third lens to the focal length of the optical lens can be controlled within a certain range, so that the refractive power of the third lens can be controlled within a reasonable range, so that the optical lens can be effectively balanced spherical aberration, so that the optical lens has good imaging quality. And when it is lower than the lower limit of the above conditional formula, the absolute value of the radius of curvature of the image side of the third lens at the optical axis is too small, resulting in the surface shape of the third lens at the near optical axis being too curved, increasing the third lens The sensitivity of the third lens is not conducive to the engineering manufacture of the third lens, or the focal length of the optical lens is too long to compress the total optical length of the optical lens, resulting in an increase in the volume of the optical lens, which is not conducive to the optical lens to meet the miniaturization design requirements; and when When the upper limit of the above conditional expression is exceeded, the absolute value of the radius of curvature of the image side of the third lens at the optical axis is too large, resulting in the surface shape of the third lens at the near optical axis being too gentle, and it is difficult to fully correct astigmatism, field curvature and distortion.

As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 0.7<AT12/(AT34+AT45)<0.9; wherein, AT12 is the first lens and the air gap on the optical axis between the second lens, AT34 is the air gap on the optical axis between the third lens and the fourth lens, AT45 is the fourth lens and the fifth lens The air gap between them on the optical axis. By reasonably setting the air interval between the first lens and the second lens on the optical axis, the air interval between the third lens and the fourth lens on the optical axis, and the air interval between the fourth lens and the fifth lens on the optical axis The interrelationship is conducive to controlling the air interval between the first lens and the second lens, the air interval between the third lens and the fourth lens, and the air interval between the fourth lens and the fifth lens within a reasonable range, which is conducive to the optical lens having sufficient The proportion of the air gap, so as to ensure the stability and imaging quality of the optical lens; at the same time, it is beneficial to further regulate the total optical length of the optical lens, so that the optical lens can shorten the total optical length to achieve a miniaturized design. Tolerance sensitivity between each lens can reduce the difficulty of assembling each lens and improve the assembly stability of each lens; and, due to the improvement of the overall compactness of the optical lens, the optical lens can make full use of its internal space and reduce the incidence of light beams The angle of incidence to each surface can reduce the risk of stray light and ghost images between adjacent lenses. At the same time, it can also help the imaging light to converge and improve aberration and reduce distortion, which can effectively expand the field of view of the entire optical lens. while maintaining good image quality.

As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 0.8<SD11/SD51<0.9; wherein, SD11 is the maximum effective Half diameter, SD51 is the maximum effective half diameter of the object side of the fifth lens. By controlling the ratio of the maximum effective semi-diameter of the object side of the first lens to the maximum effective semi-diameter of the object side of the fifth lens within a reasonable range, the light rays between the first lens and the fifth lens can be effectively transmitted smoothly, Reduce the impact of vignetting on the relative illuminance of the peripheral field of view to ensure the imaging quality of the optical lens, and at the same time reduce the radial size of the first lens, so that the above-mentioned optical lens with eight lenses can achieve a small head design, and This can reduce the size of the hole on the device screen, thereby increasing the screen-to-body ratio of the device. In addition, when the limitation of the above relational expression is satisfied, it is also beneficial to the processing and molding of the first lens and the fifth lens, and improves the yield of the lens.

As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relational expression:

1.6<(SD62-SD71)/(SD72-SD81)<2.1; wherein, SD62 is the maximum effective semi-diameter of the image side of the sixth lens, and SD71 is the maximum effective semi-diameter of the object side of the seventh lens, SD72 is the maximum effective semi-diameter of the image side of the seventh lens, and SD81 is the maximum effective semi-diameter of the object side of the eighth lens. By controlling the difference between the maximum effective semi-diameter of the image side of the sixth lens and the maximum effective semi-diameter of the object side of the seventh lens, the maximum effective semi-diameter of the image side of the seventh lens and the maximum effective radius of the object side of the eighth lens The ratio of the difference between the effective semi-diameters is within a certain range, which is conducive to making the light pass through the rear lens group (that is, the lens group composed of the sixth lens, the seventh lens and the eighth lens) more smoothly and smoothly, reducing the lens size. The deflection angle of the light rays in between, so that the light in the peripheral field of view can enter the object side of the eighth lens from the image side of the sixth lens with a slow change trend, slowing down the marginal aberration, thereby helping to reduce the risk of distortion of the optical lens , while reducing the sensitivity of the peripheral field of view.

As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 0.9<CT4/CT5<1.0; wherein, CT4 is the fourth lens on the optical axis The thickness of CT5 is the thickness of the fifth lens on the optical axis. Through the reasonable configuration of the central thickness of the fourth lens and the fifth lens, on the one hand, it is beneficial to avoid the fourth lens and the fifth lens from being too curved or smooth under the condition of ensuring that the optical lens has a suitable optical total length, thereby facilitating Reduce the difficulty of processing and molding of the fourth lens and the fifth lens, and thus better realize engineering manufacturing, which is beneficial to the processing and manufacturing of the fourth lens and the fifth lens; on the other hand, it can effectively adjust the gap between the fourth lens and the fifth lens Refractive power relationship, which is beneficial to realize the wide-angle and miniaturized design of the optical lens while improving the optical performance of the optical lens; and also helps to reduce the exit angle of the light exiting the optical lens, which can avoid the large-angle light from being effectively converged to the imaging Improve the sensitivity of the photosensitive chip, which is conducive to realizing the characteristics of the large image surface of the optical lens, so as to match the photosensitive chip with higher pixels and improve the imaging quality. At the same time, it can also enable the edge of the imaging surface of the optical lens to obtain higher relative brightness , to reduce the possibility of optical lens vignetting.

As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 0.85<R9/R10<1.85; wherein, R9 is the object side of the fifth lens at The radius of curvature on the optical axis, R10 is the radius of curvature of the image side of the fifth lens on the optical axis. When the above relationship is satisfied, the thickness ratio trend of the object side and the image side of the fifth lens can be well controlled, so as to limit the shape of the fifth lens. In this way, not only can the fifth lens be effectively controlled in the entire optical The refractive force borne by the lens is to control the spherical aberration contribution of the fifth lens within a reasonable range, so that the image quality of the on-axis field of view and the off-axis field of view will not be significantly degraded due to the contribution of spherical aberration, so that it can Effectively improve the spherical aberration and advanced coma of the optical lens, improve the optical performance and imaging quality of the optical lens; at the same time, it is also beneficial to ensure the machinability of the shape of the fifth lens, so as to ensure the processing and production of the fifth lens and improve the fifth lens. Lens manufacturing yield. And when exceeding the scope of above-mentioned relational expression, cause the surface of the 5th lens to be too curved or too flat, like this, be unfavorable for the processing molding of the 5th lens, thereby can't guarantee the manufacturing yield of the 5th lens; Also be unfavorable for optical lens simultaneously Correction of edge aberrations, and may also increase the probability of ghosting or increase the intensity of ghosting, affecting image quality.

In a second aspect, the present invention discloses a camera module. The camera module includes a photosensitive chip and the optical lens as described in the first aspect above, and the photosensitive chip is arranged on the image side of the optical lens. The camera module with the optical lens has the characteristics of large aperture. Compared with the five-piece optical lens, it has a larger amount of light input, which can improve the shooting conditions in dark light, and is suitable for shooting in dark light environments such as night scenes, rainy days, and starry sky. And it has a better blur effect. At the same time, the camera module also has the characteristics of a large image surface, which can improve the resolution of the camera module and improve the imaging quality of the camera module to achieve high pixel shooting effect, so that the camera module has a better imaging effect.

In a third aspect, the present invention also discloses an electronic device, the electronic device includes a casing and the camera module as described in the second aspect above, and the camera module is arranged in the casing. The electronic device with the camera module has the characteristics of large aperture, which has a larger amount of light than the five-piece optical lens, which can improve the shooting conditions in dark light, and is suitable for shooting in dark light environments such as night scenes, rainy days, and starry sky. And it has a better blur effect. At the same time, the electronic device also has the characteristics of a large image surface, which can improve the resolution of the electronic device and improve the imaging quality of the electronic device in the case of realizing a miniaturized design, so as to achieve a high-pixel shooting effect. , so that the electronic equipment has a better imaging effect.

Compared with prior art, the beneficial effect of the present invention is:

In the optical lens, camera module and electronic equipment provided by the embodiments of the present invention, the optical lens adopts eight lenses, the number of lenses is reasonable, the structure is ingenious, and the volume is small. Moreover, by selecting an appropriate number of lenses and reasonably configuring the refractive power and surface shape of each lens, it is possible to better capture the detailed information of the object while realizing the miniaturized design of the optical lens, improve the ability of the optical lens to capture the details of the object, and improve the performance of the optical lens. The image quality of the optical lens improves the resolution and imaging clarity of the optical lens, so that the optical lens can have a better imaging effect to meet people's high-definition imaging requirements for the optical lens; and also make the optical lens meet the following relationship: 1.6<f/D<1.7, the focal length of the optical lens and the entrance pupil diameter of the optical lens can be reasonably configured, which is conducive to making the optical lens have a larger aperture and a smaller optical length, and can also ensure the wide-angle characteristics of the optical lens. It is beneficial to increase the beam of light entering the optical lens, so that the optical lens has a larger amount of light, so as to ensure that there is enough light to converge on the imaging surface, improve the brightness of the imaging, and make the captured image clearer. High-definition wide-angle shooting effect; and a large amount of light is also convenient to capture the details of the subject and improve the imaging resolution of the optical lens. Good optical performance, that is, the optical lens of the present application can shoot high-quality images of low-brightness object space scenes such as night scenes and starry sky. In addition, the larger diameter of the entrance pupil is also conducive to large-angle light entering the optical lens, so that the optical lens has a large field of view range, which can obtain sufficient object space information and improve imaging quality.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

FIG. 1 is a schematic structural view of the optical lens disclosed in the first embodiment of the present application;

Fig. 2 is a longitudinal spherical aberration diagram, an astigmatism curve diagram and a distortion curve diagram of the optical lens disclosed in the first embodiment of the present application;

FIG. 3 is a schematic structural view of the optical lens disclosed in the second embodiment of the present application;

Fig. 4 is a longitudinal spherical aberration diagram, an astigmatism curve diagram and a distortion curve diagram of the optical lens disclosed in the second embodiment of the present application;

Fig. 5 is a schematic structural diagram of the optical lens disclosed in the third embodiment of the present application;

Fig. 6 is a longitudinal spherical aberration diagram, an astigmatism curve diagram and a distortion curve diagram of the optical lens disclosed in the third embodiment of the present application;

Fig. 7 is a schematic structural view of the optical lens disclosed in the fourth embodiment of the present application;

Fig. 8 is a longitudinal spherical aberration diagram, an astigmatism curve diagram and a distortion curve diagram of the optical lens disclosed in the fourth embodiment of the present application;

FIG. 9 is a schematic structural view of the optical lens disclosed in the fifth embodiment of the present application;

Fig. 10 is a longitudinal spherical aberration diagram, an astigmatism curve diagram and a distortion curve diagram of the optical lens disclosed in the fifth embodiment of the present application;

Fig. 11 is a schematic structural view of the optical lens disclosed in the sixth embodiment of the present application;

Fig. 12 is a longitudinal spherical aberration diagram, an astigmatism curve diagram and a distortion curve diagram of the optical lens disclosed in the sixth embodiment of the present application;

13 is a schematic structural view of the camera module disclosed in the present application;

FIG. 14 is a schematic structural diagram of an electronic device disclosed in the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", The orientations or positional relationships indicated by "vertical", "horizontal", "horizontal", and "longitudinal" are based on the orientations or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not intended to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

Moreover, some of the above terms may be used to indicate other meanings besides orientation or positional relationship, for example, the term "upper" may also be used to indicate a certain attachment relationship or connection relationship in some cases. Those skilled in the art can understand the specific meanings of these terms in the present invention according to specific situations.

Furthermore, the terms "installed", "disposed", "provided", "connected", "connected" are to be interpreted broadly. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediary; internal connectivity. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply that the indicated devices, elements Or the relative importance and number of components. Unless otherwise specified, "plurality" means two or more.

The technical solution of the present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

Please refer to Fig. 1, according to the first aspect of the present application, the present application discloses an optical lens 100, the optical lens 100 includes a first lens L1, a second lens arranged in sequence along the optical axis O from the object side to the image side L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and eighth lens L8. When imaging, the 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 second lens L1 sequentially from the object side of the first lens L1. The eight lenses L8 are finally imaged on the imaging surface 101 of the optical lens 100 . Among them, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive or negative refractive power, the fourth lens L4 has positive or negative refractive power, and the fifth lens L5 The sixth lens L6 has positive or negative refractive power, the seventh lens L7 has positive refractive power, and the eighth lens L8 has negative refractive power.

Further, the object side S1 of the first lens L1 can be convex at the near optical axis, the image side S2 of the first lens L1 can be concave at the near optical axis; the object side S3 of the second lens L2 can be at the near optical axis It can be convex, and the image side S4 of the second lens L2 can be concave at the near optical axis; the object side S5 of the third lens L3 can be convex or concave at the near optical axis, and the image side S6 of the third lens L3 can be at the near optical axis. The near optical axis can be convex; the object side S7 of the fourth lens L4 can be concave at the near optical axis, and the image side S8 of the fourth lens L4 can be convex or concave at the near optical axis; the fifth lens L5 The object side S9 can be concave at the near optical axis, and the image side S10 of the fifth lens L5 can be convex at the near optical axis; the object side S11 of the sixth lens L6 can be convex or concave at the near optical axis. The image side S12 of the six lenses L6 can be concave at the near optical axis; the object side S13 of the seventh lens L7 can be convex at the near optical axis, and the image side S14 of the seventh lens L7 can be concave or concave at the near optical axis. is a convex surface; the object side S15 of the eighth lens L8 can be convex at the near optical axis, and the image side S16 of the eighth lens L8 can be concave at the near optical axis.

Considering that the optical lens 100 is mostly used in electronic devices such as smart phones and smart tablets, or in vehicle-mounted devices and driving recorders of automobiles. When the optical lens 100 can be applied to electronic devices such as smart phones and smart tablets, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, The material of the seventh lens L7 and the eighth lens L8 can be selected from plastics, so that while the optical lens 100 has a good optical effect, the overall weight of the optical lens 100 can also be reduced, and it can have good portability and be easier to use. Processing of complex surface shapes of lenses. Meanwhile, the aforementioned first lens L1 , second lens L2 , third lens L3 , fourth lens L4 , fifth lens L5 , sixth lens L6 , seventh lens L7 and eighth lens L8 can all be aspherical. In addition, it can be understood that, in other embodiments, when the optical lens 100 is used as a camera on an automobile body, 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 all be glass lenses, so that the optical lens 100 has good optical effect and can reduce the temperature sensitivity of the optical lens 100 . At the same time, each lens can be spherical.

In some embodiments, the optical lens 100 further includes a diaphragm 102 , which can be an aperture diaphragm or a field diaphragm, and can be disposed between the object side of the optical lens 100 and the object side S1 of the first lens L1 . It can be understood that, in other embodiments, the diaphragm 102 can also be arranged between any two lenses, for example, the diaphragm 102 can be arranged on the image side S8 of the fourth lens L4 and the object side S9 of the fifth lens L5 In between, the setting is adjusted according to the actual situation, which is not specifically limited in this embodiment.

In some embodiments, the optical lens 100 also includes a filter L9, such as an infrared filter, and the infrared filter can be arranged between the image side S16 of the eighth lens L8 and the imaging surface 101 of the optical lens 100, so as to filter Except for other bands of light such as visible light, and only allow infrared light to pass through, an infrared filter is used to filter out other bands of light such as visible light to improve the imaging quality and make the imaging more in line with the visual experience of the human eye; and The optical lens 100 can be used as an infrared optical lens, that is, the optical lens 100 can also image images in dim environments and other special application scenarios and can obtain better image effects. It can be understood that the optical filter L9 can be made of optical glass coating, colored glass, or optical filter of other materials, which can 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: 1.63<f/D<1.7, for example f/D=1.637, 1.648, 1.663, 1.666, 1.672, 1.676, 1.680, 1.685, 1.689, 1.690 or 1.693, etc.; , f is the focal length of the optical lens 100, and D is the entrance pupil diameter of the optical lens 100. When the above relational expression is satisfied, the focal length of the optical lens 100 and the diameter of the entrance pupil of the optical lens 100 can be rationally configured, which is conducive to making the optical lens 100 have a larger aperture and a smaller total optical length, while also ensuring the optical lens 100. The wide-angle feature is conducive to increasing the light bundle entering the optical lens 100, so that the optical lens 100 has a greater amount of light entering, thereby ensuring that enough light can be converged and formed on the imaging surface 101, improving the brightness of the imaging, and making the shooting The image can be clearer and achieve high-definition wide-angle shooting effect; and the large amount of light is also convenient to capture the details of the subject and improve the imaging resolution of the optical lens 100, even in cloudy, rainy and other dark light environments It can also have better optical performance when used under the environment, that is, the optical lens 100 of the present application can shoot high-quality images of low-brightness object space scenes such as night scenes and starry sky. In addition, the larger diameter of the entrance pupil is also conducive to large-angle light entering the optical lens 100, so that the optical lens 100 has a large field of view range, which can obtain sufficient object space information and improve imaging quality. And when the upper limit of the above-mentioned relational expression is exceeded, the aperture of the optical lens 100 is likely to be too small, which is not conducive to obtaining a sufficient amount of incoming light in a dark shooting environment, so that the brightness of the imaging surface 101 is reduced, and the imaging quality is not high; At the lower limit of the above relationship, the focal length of the optical lens 100 is too small to meet the design requirements of the field angle range of the optical lens 100, and it is impossible to obtain sufficient object space information, resulting in missing imaging information and affecting the shooting quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.0<Imgh/f<1.1, such as Imgh/f=1.017, 1.032, 1.047, 1.052, 1.057, 1.059, 1.060, 1.064, 1.071, 1.084, 1.087 or 1.095, etc. etc.; wherein, Imgh is the radius of the maximum effective imaging circle on the imaging surface 101 of the optical lens 100, that is, the half-image height of the optical lens 100. When the above-mentioned relational expression is satisfied, it is beneficial to increase the light-incoming range of the field of view of the optical lens 100 and expand the angle of view, thereby maintaining the good optical performance of the optical lens 100 and realizing the high-pixel feature of the optical lens 100, which can be very good Accurately capturing the details of the subject is beneficial to obtain a larger field of view to achieve a wide-angle design while reducing the deflection angle of the outgoing light, thereby reducing vignetting, suppressing distortion, and improving the shooting effect of the optical lens 100 .

In some embodiments, the optical lens 100 satisfies the following relationship: 1.1<TTL/Imgh<1.21, such as TTL/Imgh=1.108, 1.122, 1.134, 1.161, 1.174, 1.201, 1.204, 1.205, 1.206, 1.207, 1.208 or 1.209, etc. Wherein, TTL is the distance on the optical axis from the object side S1 of the first lens L1 to the imaging surface 101 of the optical lens 100 , that is, the total optical length of the optical lens 100 . By controlling the ratio of the total optical length of the optical lens 100 to the height of the half image within a reasonable range, the optical total length of the optical lens 100 can be effectively controlled under the premise that the optical lens 100 has a larger viewing angle and image surface, so that The structure of the optical lens 100 is more compact, has ultra-thin characteristics, and meets the design requirements of miniaturization, so that the optical lens 100 can be better mounted on thinner and lighter electronic devices, and at the same time, the optical lens 100 can also be compatible with large-sized Photosensitive chip, which is conducive to improving the imaging quality of electronic equipment. And when the upper limit of the above-mentioned relational expression is exceeded, the optical total length of the optical lens 100 is too large, causing the thickness of the optical lens 100 in the direction of the optical axis to increase, which is not conducive to the thin and light miniaturization design of the optical lens 100, and at the same time, the optical lens 100 If the size of the imaging surface 101 is too small, it is easy to produce vignetting phenomenon, resulting in the loss of imaging information and reducing the imaging quality; and when it is lower than the lower limit of the above relational expression, the total optical length of the optical lens 100 is too small, which is not conducive to lens arrangement and reduces the optical quality. Assembly efficiency of the lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 5.8<|R6/f|<6.2, for example |R6/f|=5.837, 5.867, 5.947, 5.992, 6.029, 6.037, 6.051, 6.068, 6.085, 6.094, 6.142 or 6.146, etc.; wherein, R6 is the radius of curvature of the image side S6 of the third lens L3 on the optical axis. By satisfying the above relational expression, the ratio of the radius of curvature of the image side surface S6 of the third lens L3 to the focal length of the optical lens 100 can be controlled within a certain range, so that the refractive power of the third lens L3 can be controlled within a reasonable range, thereby effectively The spherical aberration of the optical lens 100 is balanced so that the optical lens 100 has good imaging quality. And when it is lower than the lower limit of the above-mentioned conditional formula, the absolute value of the radius of curvature of the image side S6 of the third lens L3 at the optical axis is relatively small, which causes the surface shape of the third lens L3 at the near optical axis to be too curved, increasing the The sensitivity of the third lens L3 is not conducive to the engineering manufacture of the third lens L3, or the focal length of the optical lens 100 is too long to compress the total optical length of the optical lens 100, resulting in an increase in the volume of the optical lens 100, which is not conducive to the optical lens. 100 meets the miniaturization design requirements; and when the upper limit of the above conditional formula is exceeded, the absolute value of the radius of curvature of the image side S6 of the third lens L3 at the optical axis is too large, resulting in the surface of the third lens L3 at the near optical axis too flat to adequately correct for astigmatism, curvature of field, and distortion.

In some embodiments, the optical lens 100 satisfies the following relationship 2.7<|R7/f|<2.8, for example |R7/f|=2.708, 2.717, 2.722, 2.731, 2.738, 2.743, 2.747, 2.752, 2.758, 2.761 or 2.779 etc.; wherein, R7 is the radius of curvature of the object side surface S7 of the fourth lens L4 on the optical axis. By satisfying the above relational expression, the ratio of the radius of curvature of the object side surface S7 of the fourth lens L4 to the focal length of the optical lens 100 can be controlled within a certain range, so that the refractive power of the fourth lens L4 can be controlled within a reasonable range, thereby effectively The spherical aberration of the optical lens 100 is balanced so that the optical lens 100 has good imaging quality. And when it is lower than the lower limit of the above conditional formula, the absolute value of the radius of curvature of the object side surface S7 of the fourth lens L4 at the optical axis is too small, resulting in the surface shape of the fourth lens L4 at the near optical axis being too curved, increasing the The sensitivity of the fourth lens L4 is unfavorable for the engineering manufacture of the fourth lens L4, or the focal length of the optical lens 100 is too long to compress the total optical length of the optical lens 100, resulting in an increase in the volume of the optical lens 100, which is unfavorable for the optical lens 100. 100 meets the miniaturization design requirements; and when the upper limit of the above conditional formula is exceeded, the absolute value of the radius of curvature of the object side S7 of the fourth lens L4 at the optical axis is too large, resulting in the surface of the fourth lens L4 at the near optical axis too flat to adequately correct for astigmatism, curvature of field, and distortion.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.7<AT12/(AT34+AT45)<0.9, such as AT12/(AT34+AT45)=0.717, 0.734, 0.756, 0.764, 0.789, 0.806, 0.825, 0.841, 0.867, 0.869, 0.872 or 0.887, etc.; among them, AT12 is the air gap on the optical axis between the first lens L1 and the second lens L2, AT34 is the air gap on the optical axis between the third lens L3 and the fourth lens L4 The air gap, AT45 is the air gap on the optical axis between the fourth lens L4 and the fifth lens L5. By reasonably setting the air gap between the first lens L1 and the second lens L2 on the optical axis, the air gap between the third lens L3 and the fourth lens L4 on the optical axis, and the fourth lens L4 and the fifth lens L5 on the optical axis The interrelationship between the air gaps is beneficial to control the air gap between the first lens L1 and the second lens L2, the air gap between the third lens L3 and the fourth lens L4, and the air gap between the fourth lens L4 and the fifth lens L5 Within a reasonable range, it is beneficial for the optical lens 100 to have a sufficient air gap ratio, thereby ensuring the stability and imaging quality of the optical lens 100; it is also beneficial to further regulate the total optical length of the optical lens 100, so that the optical lens 100 can Under the condition of shortening the total optical length to realize miniaturized design, the tolerance sensitivity between lenses is reduced, thereby reducing the difficulty of assembling each lens and improving the assembly stability of each lens; and, because the overall structure of the optical lens 100 is improved The compactness enables the optical lens 100 to make full use of its internal space and reduce the incident angle of the light beam incident on each surface, thereby reducing the risk of stray light and ghost images between adjacent lenses, and at the same time helping to collect imaging light. Combining and improving the aberration and reducing the distortion can effectively make the entire optical lens 100 expand the field of view while maintaining good imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.8<SD11/SD51<0.9, for example, SD11/SD51=0.829, 0.832, 0.835, 0.842, 0.843, 0.845, 0.856, 0.877, 0.883 or 0.887, etc.; wherein, SD11 is the maximum effective semi-diameter of the object side S1 of the first lens L1, and SD51 is the maximum effective semi-diameter of the object side S9 of the fifth lens L5. By controlling the ratio of the maximum effective radius diameter of the object side surface S1 of the first lens L1 to the maximum effective radius diameter of the object side surface S9 of the fifth lens L5 within a reasonable range, the distance between the first lens L1 and the fifth lens L5 can be effectively made The smooth transmission of light between them reduces the influence of vignetting on the relative illuminance of the peripheral field of view to ensure the imaging quality of the optical lens 100. At the same time, it can also reduce the radial size of the first lens L1, so that the above-mentioned optical lens with eight lenses The lens 100 implements a small head design, thereby reducing the size of the opening on the device screen, thereby increasing the screen-to-body ratio of the device. In addition, when the limitation of the above relational expression is satisfied, it is also beneficial to the processing and molding of the first lens L1 and the fifth lens L5, and improves the yield rate of the lenses.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.6<(SD62-SD71)/(SD72-SD81)<2.1, for example (SD62-SD71)/(SD72-SD81)=1.647, 1.662, 1.685, 1.711, 1.756, 1.779, 1.848, 1.861, 1.889, 1.943, 2.034; or 2.086, etc.; wherein, SD62 is the maximum effective semi-diameter of the image side S12 of the sixth lens L6, and SD71 is the maximum effective radius of the object side S13 of the seventh lens L7 The semi-diameter, SD72 is the maximum effective semi-diameter of the image side S14 of the seventh lens L7, and SD81 is the maximum effective semi-diameter of the object side S15 of the eighth lens L8. By controlling the difference between the maximum effective radius of the image side S12 of the sixth lens L6 and the maximum effective radius of the object side S13 of the seventh lens L7, the maximum effective radius of the image side S14 of the seventh lens L7 and the eighth lens L7 The ratio of the difference of the maximum effective semi-diameter of the object side S15 of lens L8 is in a certain range, which is conducive to making the light pass through the rear group of lenses (namely the sixth lens L6, the seventh lens L7 and the eighth lens L6) more smoothly and smoothly. The lens group composed of lens L8) reduces the deflection angle of the light rays between the lenses, so that the light rays of the peripheral field of view can enter the object side S15 of the eighth lens L8 from the image side S12 of the sixth lens L6 with a slow change trend, The marginal aberration is alleviated, thereby reducing the risk of distortion of the optical lens 100 and reducing the sensitivity of the peripheral field of view.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.9<CT4/CT5<1.0, for example CT4/CT5=0.918, 0.923, 0.936, 0.941, 0.943, 0.944, 0.947, 0.949, 0.954, 0.961, 0.975, 0.981 or 0.997 and so on; wherein, CT4 is the thickness of the fourth lens L4 on the optical axis, and CT5 is the thickness of the fifth lens L5 on the optical axis. By rationally disposing the central thicknesses of the fourth lens L4 and the fifth lens L5, on the one hand, it is beneficial to avoid the fourth lens L4 and the fifth lens L5 from being too curved or Smooth, thereby helping to reduce the difficulty of processing and forming the fourth lens L4 and the fifth lens L5, and then better realize engineering manufacturing, which is beneficial to the processing and manufacturing of the fourth lens L4 and the fifth lens L5; on the other hand, it can effectively adjust The refractive power relationship between the fourth lens L4 and the fifth lens L5 is conducive to realizing the wide-angle and miniaturized design of the optical lens 100 while improving the optical performance of the optical lens 100; The output angle can prevent large-angle light from being effectively converged to the imaging surface 101, improve the sensitivity of the photosensitive chip, and help realize the characteristics of the large image surface of the optical lens 100, so as to match the photosensitive chip with higher pixels and improve the imaging quality. It can also make the edge of the imaging surface 101 of the optical lens 100 obtain higher relative brightness, and reduce the possibility of vignetting of the optical lens 100 .

In some embodiments, the optical lens 100 satisfies the following relationship: 0.85<R9/R10<1.85, for example, R9/R10=0.863, 0.913, 0.935, 0.947, 0.951, 0.962, 0.977, 0.988, 1.039, 1.119, 1.293, 1.447, 1.593, 1.776 or 1.840, etc.; wherein, R9 is the radius of curvature of the object side S9 of the fifth lens L5 on the optical axis, and R10 is the radius of curvature of the image side S10 of the fifth lens L5 on the optical axis. When the above relational expression is satisfied, the thickness ratio trend of the object side S9 and the image side of the fifth lens L5 can be well controlled, so as to limit the shape of the fifth lens L5, so that not only the fifth lens can be effectively controlled The refractive power borne by L5 in the entire optical lens 100 is to control the spherical aberration contribution of the fifth lens L5 within a reasonable range, so that the image quality of the on-axis field of view and the off-axis field of view will not be affected by the contribution of spherical aberration Obvious degradation, so as to effectively improve the spherical aberration and advanced coma of the optical lens 100, improve the optical performance and imaging quality of the optical lens 100; meanwhile, it is also beneficial to ensure the workability of the shape of the fifth lens L5, so as to ensure the The processing and production of the five-lens L5 improves the manufacturing yield of the fifth lens L5. And when exceeding the range of the above-mentioned relational expression, cause the surface of the fifth lens L5 to be too curved or too flat, like this, be unfavorable for the processing and molding of the fifth lens L5, thus can't guarantee the manufacturing yield of the fifth lens L5; This is beneficial to the correction of the edge aberration of the optical lens 100 , and may also increase the probability of ghosting or increase the intensity of ghosting, affecting the imaging quality.

The optical lens 100 of this embodiment will be described in detail below in conjunction with specific parameters.

first embodiment

The structure diagram of the optical lens 100 disclosed in the first embodiment of the present application, as shown in FIG. 1 , the optical lens 100 includes a stop 102, a first lens L1, a second Lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, and filter L9. Among them, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has negative refractive power, seventh lens L7 has positive refractive power, and eighth lens L8 has negative refractive power. Regarding 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, please refer to the above detailed description , which will not be repeated here.

Further, the object side S1 of the first lens L1 is convex at the near optical axis, the image side S2 of the first lens L1 is concave at the near optical axis; the object side S3 of the second lens L2 is convex at the near optical axis , the image side S4 of the second lens L2 is concave at the near optical axis; the object side S5 of the third lens L3 is convex at the near optical axis, and the image side S6 of the third lens L3 is convex at the near optical axis; The object side S7 of the four lenses L4 is concave at the near optical axis, the image side S8 of the fourth lens L4 is concave at the near optical axis; the object side S9 of the fifth lens L5 is concave at the near optical axis, and the fifth lens The image side S10 of L5 is convex at the near optical axis; the object side S11 of the sixth lens L6 is convex at the near optical axis, and the image side S12 of the sixth lens L6 is concave at the near optical axis; the seventh lens L7 The object side S13 is convex at the near optical axis, the image side S14 of the seventh lens L7 is concave at the near optical axis; the object side S15 of the eighth lens L8 is convex at the near optical axis, and the image side S14 of the eighth lens L8 is convex at the near optical axis. S16 is concave near the optical axis.

Specifically, with the focal length f=6.45mm of the optical lens 100, the maximum field of view FOV=92.3deg of the optical lens 100, the aperture number FNO=1.68 of the optical lens 100, the optics of the optical lens 100 Taking the total length TTL=8.15mm as an example, other parameters of the optical lens 100 are given in Table 1 below. Wherein, the elements along the optical axis O of the optical lens 100 from the object side to the image side are arranged in sequence according to the order of the elements in Table 1 from top to bottom. In the same lens, the surface with a smaller surface number is the object side of the lens, and the surface with a larger surface number is the image side of the lens. For example, surface numbers 1 and 2 correspond to the object side S1 and the image side of the first lens L1 respectively. S2. The Y radius in Table 1 is the radius of curvature of the object side or image side of the corresponding surface number at the near optical axis O. The first value in the "thickness" parameter column 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 of the lens to the rear surface on the optical axis O. The value of the diaphragm 102 in the "thickness" parameter column is the distance from the diaphragm 102 to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis O) on the optical axis O, and the default is from the object side of the first lens L1 to the last The direction of the image side of each lens is the positive direction of the optical axis O. When the value is negative, it indicates that the diaphragm 102 is set on the right side of the apex of the rear surface. If the thickness of the diaphragm 102 is positive, the diaphragm 102 is behind The left side of a surface vertex. It can be understood that the units of Y radius, thickness and focal length in Table 1 are mm. In addition, the reference wavelength of the focal length of each lens in Table 1 is 555.00 nm, and the reference wavelength of the refractive index and Abbe number of each lens is 587.60 nm.

Table 1

In the first embodiment, the object side and the image side of any one of the first lens L1 to the eighth lens L8 are aspheric surfaces, and the surface type x of each aspheric lens can be determined by using but not limited to the following aspheric surface formula limited:

Among them, x is the distance vector height of the aspheric surface from the apex of the aspheric surface at the position of height h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is the above table 1 in the reciprocal of the Y radius R); K is the cone coefficient; Ai is the correction coefficient corresponding to the high-order item of the i-th item of the aspheric surface. Table 2 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A10, A12, A14, A16, A18 and A20.

Table 2

Please refer to (A) in Fig. 2, (A) in Fig. 2 shows that the optical lens 100 in the first embodiment has a wavelength of 435.00nm, 470.00mm, 510.00nm, 555.00mm, 610.00mm and 650.00nm Longitudinal spherical aberration curve diagram. In (A) of FIG. 2 , the abscissa along the X-axis direction represents the focus shift, and the unit is mm, and the ordinate along the Y-axis direction represents the normalized field of view. It can be seen from (A) in FIG. 2 that the spherical aberration value of the optical lens 100 in the first embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

Please refer to (B) in FIG. 2 . (B) in FIG. 2 is an astigmatism curve of the optical lens 100 in the first embodiment at a wavelength of 555.00 nm. In (B) in FIG. 2 , the abscissa along the X-axis direction represents the focus offset, and the unit is mm, and the ordinate along the Y-axis direction represents the field of view angle, and the unit is deg. T in the astigmatism curve diagram represents the curvature of the imaging surface 101 in the meridional direction, and S represents the curvature of the imaging surface 101 in the sagittal direction. It can be seen from (B) in FIG. 2 that at this wavelength of 555.00nm, the optical lens The astigmatism of 100 is better compensated.

Please refer to (C) in FIG. 2 . (C) in FIG. 2 is a distortion curve of the optical lens 100 in the first embodiment at a wavelength of 555.00 nm. Wherein, the abscissa along the X-axis direction represents the distortion, and the ordinate along the Y-axis direction represents the viewing angle, and the unit is deg. It can be seen from (C) in FIG. 2 that the distortion of the optical lens 100 is well corrected at the wavelength of 555.00 nm.

second embodiment

Please refer to FIG. 3 , which is a schematic structural diagram of an optical lens 100 according to a second embodiment of the present application. The optical lens 100 includes a diaphragm 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6, which are sequentially arranged from the object side to the image side along the optical axis O , the seventh lens L7, the eighth lens L8 and the filter L9. Among them, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has negative refractive power, and the sixth lens L6 has negative refractive power, seventh lens L7 has positive refractive power, and eighth lens L8 has negative refractive power. Regarding 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, please refer to the above detailed description , which will not be repeated here.

Further, in the second embodiment, regarding 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 For the surface shape of each lens, refer to the description of the surface shape of each lens in the first embodiment, which will not be repeated here.

In the second embodiment, with the focal length f=6.38mm of the optical lens 100, the maximum field of view FOV=92.4deg of the optical lens 100, the aperture number FNO=1.66 of the optical lens 100, the optical The total optical length TTL of the lens 100 is 8.13mm as an example. The other parameters in the second embodiment are given in Table 3 below, and the definition of each parameter can be obtained from the description of the foregoing embodiments, and will not be repeated here. It can be understood that the units of Y radius, thickness and focal length in Table 3 are mm. In addition, the reference wavelength of the focal length of each lens in Table 3 is 555.00 nm, and the reference wavelength of the refractive index and Abbe number of each lens is 587.60 nm.

table 3

In the second embodiment, Table 4 shows the higher-order coefficients of each aspheric mirror surface that can be used in the first lens L1 to the eighth lens L8 in the second embodiment, wherein each aspheric surface type can be determined by the first lens L1 to the eighth lens L8. The formula definition given in an example.

Table 4

Please refer to FIG. 4 . FIG. 4 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens 100 of the second embodiment. For specific definitions, please refer to the description in the first embodiment, and details will not be repeated here. It can be seen from (A) in FIG. 4 that the spherical aberration value of the optical lens 100 in the second embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better. It can be seen from (B) in FIG. 4 that at a wavelength of 555.00 nm, the astigmatism of the optical lens 100 is better compensated. It can be seen from (C) in FIG. 4 that the distortion of the optical lens 100 is well corrected at a wavelength of 555.00 nm.

third embodiment

Please refer to FIG. 5 , which shows 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, and a sixth lens L6, which are sequentially arranged from the object side to the image side along the optical axis O , the seventh lens L7, the eighth lens L8 and the filter L9. Among them, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has negative refractive power, and the sixth lens L6 has negative refractive power, seventh lens L7 has positive refractive power, and eighth lens L8 has negative refractive power. Regarding 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, please refer to the above detailed description , which will not be repeated here.

Further, in the third embodiment, the difference between the surface type of each lens and the surface type of each lens in the first embodiment is that: the image side S8 of the fourth lens L4 is a convex surface at the near optical axis, and the sixth lens The object side S11 of L6 is concave at the near optical axis.

In the third embodiment, with the focal length f=6.32mm of the optical lens 100, the maximum field of view FOV=92.2deg of the optical lens 100, the aperture number FNO=1.67 of the optical lens 100, the optical The total optical length TTL of the lens 100 is 8.07mm as an example. The other parameters in the third embodiment are given in Table 5 below, and the definition of each parameter can be obtained from the foregoing description, and will not be repeated here. It can be understood that the units of Y radius, thickness, and focal length in Table 5 are mm. In addition, the reference wavelength of the focal length of each lens in Table 5 is 555.00 nm, and the reference wavelength of the refractive index and Abbe number of each lens is 587.60 nm.

table 5

In the third embodiment, Table 6 shows the higher-order coefficients of each aspheric mirror surface that can be used in the first lens L1 to the eighth lens L8 in the third embodiment, wherein each aspheric surface type can be determined by the first lens L1 to the eighth lens L8. The formula definition given in an example.

Table 6

Please refer to FIG. 6 . FIG. 6 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens 100 of the third embodiment. For specific definitions, please refer to the description in the first embodiment, which will not be repeated here. It can be seen from (A) in FIG. 6 that the spherical aberration value of the optical lens 100 in the third embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better. It can be seen from (B) in FIG. 6 that at a wavelength of 555.00 nm, the astigmatism of the optical lens 100 is better compensated. It can be seen from (C) in FIG. 6 that the distortion of the optical lens 100 is well corrected at a wavelength of 555.00 nm.

Fourth embodiment

Please refer to FIG. 7 , which is a schematic structural diagram of the optical lens 100 disclosed in the 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, and a sixth lens L6, which are sequentially arranged from the object side to the image side along the optical axis O , the seventh lens L7, the eighth lens L8 and the filter L9. Among them, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has negative refractive power, and the sixth lens L6 has positive refractive power, seventh lens L7 has positive refractive power, and eighth lens L8 has negative refractive power. Regarding 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, please refer to the above detailed description , which will not be repeated here.

Further, in the fourth embodiment, regarding 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 For the surface shape of each lens, refer to the description of the surface shape of each lens in the first embodiment, which will not be repeated here.

In the fourth embodiment, with the focal length f=6.37mm of the optical lens 100, the maximum field of view FOV=92deg of the optical lens 100, the aperture number FNO=1.66 of the optical lens 100, the optical lens 100 optical total length TTL = 8.1mm as an example. The other parameters in the fourth embodiment are given in Table 7 below, and the definition of each parameter can be obtained from the foregoing description, and will not be repeated here. It can be understood that the units of Y radius, thickness and focal length in Table 7 are mm. In addition, the reference wavelength of the focal length of each lens in Table 7 is 555.00 nm, and the reference wavelength of the refractive index and Abbe number of each lens is 587.60 nm.

Table 7

In the fourth embodiment, Table 8 shows the higher-order term coefficients of each aspheric mirror surface that can be used in the first lens L1 to the eighth lens L8 in the fourth embodiment, wherein each aspheric surface type can be determined by the first lens L1 to the eighth lens L8. The formula definition given in an example.

Table 8

Please refer to FIG. 8 . FIG. 8 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens 100 of the fourth embodiment. For specific definitions, please refer to the description in the first embodiment, and details will not be repeated here. It can be seen from (A) in FIG. 8 that the spherical aberration value of the optical lens 100 in the fourth embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better. It can be seen from (B) in FIG. 8 that at a wavelength of 555.00 nm, the astigmatism of the optical lens 100 is better compensated. It can be seen from (C) in FIG. 8 that the distortion of the optical lens 100 is well corrected at a wavelength of 555.00 nm.

fifth embodiment

Please refer to FIG. 9 , which is a schematic structural diagram of the optical lens 100 disclosed in the 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, and a sixth lens L6, which are sequentially arranged from the object side to the image side along the optical axis O , the seventh lens L7, the eighth lens L8 and the filter L9. Among them, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has negative refractive power, seventh lens L7 has positive refractive power, and eighth lens L8 has negative refractive power. Regarding 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, please refer to the above detailed description , which will not be repeated here.

Further, in the fifth embodiment, the difference between the surface type of each lens and the surface type of each lens in the first embodiment is that: the image side S8 of the fourth lens L4 is a convex surface at the near optical axis, and the sixth lens The object side S11 of L6 is concave at the near optical axis.

In the fifth embodiment, with the focal length f=6.39mm of the optical lens 100, the maximum field of view FOV=92.2deg of the optical lens 100, the aperture number FNO=1.69 of the optical lens 100, the optical The total optical length TTL of the lens 100 is 8.11 mm as an example. The other parameters in the fifth embodiment are given in Table 9 below, and the definition of each parameter can be obtained from the foregoing description, and will not be repeated here. It can be understood that the units of Y radius, thickness and focal length in Table 9 are mm. In addition, the reference wavelength of the focal length of each lens in Table 9 is 555.00 nm, and the reference wavelength of the refractive index and Abbe number of each lens is 587.60 nm.

Table 9

In the fifth embodiment, Table 10 shows the higher-order coefficients of each aspheric mirror surface that can be used in the first lens L1 to the eighth lens L8 in the fifth embodiment, wherein each aspheric surface type can be determined by the first lens L1 to the eighth lens L8. The formula definition given in an example.

Table 10

Please refer to FIG. 10 . FIG. 10 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens 100 of the fifth embodiment. For specific definitions, please refer to the description in the first embodiment, and details will not be repeated here. It can be seen from (A) in FIG. 10 that the spherical aberration value of the optical lens 100 in the fifth embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better. It can be seen from (B) in FIG. 10 that at a wavelength of 555.00 nm, the astigmatism of the optical lens 100 is better compensated. It can be seen from (C) in FIG. 10 that the distortion of the optical lens 100 is well corrected at a wavelength of 555.00 nm.

Sixth embodiment

Please refer to FIG. 11 , which is a schematic structural diagram of the optical lens 100 disclosed in the sixth 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, and a sixth lens L6, which are sequentially arranged from the object side to the image side along the optical axis O , the seventh lens L7, the eighth lens L8 and the filter L9. Among them, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has negative refractive power, seventh lens L7 has positive refractive power, and eighth lens L8 has negative refractive power. Regarding 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, please refer to the above detailed description , which will not be repeated here.

Further, in the sixth embodiment, the difference between the surface type of each lens and the surface type of each lens in the first embodiment is that: the image side S8 of the fourth lens L4 is a convex surface at the near optical axis, and the sixth lens The object side S11 of L6 is concave at the near optical axis.

In the sixth embodiment, with the focal length f=6.3mm of the optical lens 100, the maximum field of view FOV=92.3deg of the optical lens 100, the aperture number FNO=1.69 of the optical lens 100, the optical The total optical length TTL of the lens 100 is 8.05mm as an example. The other parameters in the sixth embodiment are given in Table 11 below, and the definition of each parameter can be obtained from the foregoing description, and will not be repeated here. It can be understood that the units of Y radius, thickness and focal length in Table 11 are mm. In addition, the reference wavelength of the focal length of each lens in Table 11 is 555.00 nm, and the reference wavelength of the refractive index and Abbe number of each lens is 587.60 nm.

Table 11

In the sixth embodiment, Table 12 shows the higher-order term coefficients of each aspheric mirror surface that can be used in the first lens L1 to the eighth lens L8 in the sixth embodiment, wherein each aspheric surface type can be determined by the first The formula definition given in an example.

Table 12

Please refer to FIG. 12 . FIG. 12 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens 100 of the sixth embodiment. For specific definitions, please refer to the description in the first embodiment, and details will not be repeated here. It can be seen from (A) in FIG. 12 that the spherical aberration value of the optical lens 100 in the sixth embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better. It can be seen from (B) in FIG. 12 that at a wavelength of 555.00 nm, the astigmatism of the optical lens 100 is better compensated. It can be seen from (C) in FIG. 12 that the distortion of the optical lens 100 is well corrected at a wavelength of 555.00 nm.

Please refer to Table 13. Table 13 is a summary of the ratios of the relational expressions in the first embodiment to the sixth embodiment of the present application.

Table 13

Please refer to FIG. 13 , the present application also discloses a camera module. The camera module 200 includes a photosensitive chip 201 and an optical lens 100 as described in any one of the first to sixth embodiments above. The photosensitive chip 201 is disposed on the image side of the optical lens 100 . The optical lens 100 can be used to receive the light signal of the subject and project it to the photosensitive chip 201, and the photosensitive chip 201 can be used to convert the light signal corresponding to the subject into an image signal. I won't go into details here. It can be understood that the camera module 200 with the optical lens 100 has the characteristics of a large aperture. Compared with the five-piece optical lens, it has a larger amount of incoming light, which can improve the shooting conditions in dark light, and is suitable for night scenes, rainy days, and starry sky. and other low-light environments, and has a better blur effect. At the same time, the camera module 200 also has the characteristics of a large image surface, which can improve the resolution of the camera module 200 while realizing a miniaturized design, and improve the image quality of the camera module. The imaging quality of the group 200 achieves a high-pixel shooting effect, so that the camera module 200 has a better imaging effect. Since the above-mentioned technical effects have been introduced in detail in the embodiment of the optical lens 100 , details will not be repeated here.

Please refer to FIG. 14 , the present application also discloses an electronic device. The electronic device 300 includes a casing 301 and the above-mentioned camera module 200 . The camera module 200 is set on the casing 301 to obtain image information. Wherein, the electronic device 300 may be, but not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, or a car. It can be understood that the electronic device 300 having the aforementioned camera module 200 also has all the technical effects of the aforementioned optical lens 100 . That is to say, the electronic device 300 has the characteristics of a large aperture, which has a larger amount of incoming light than the five-piece optical lens, can improve dark light shooting conditions, and is suitable for shooting in dark light environments such as night scenes, rainy days, and starry sky, and has Better blur effect, meanwhile, the electronic device 300 also has the characteristics of a large image surface, which can improve the resolution of the electronic device 300 and improve the imaging quality of the electronic device 300 while realizing a miniaturized design, so as to achieve high-pixel shooting effect, so that the electronic device 300 has a better imaging effect. Since the above-mentioned technical effects have been introduced in detail in the embodiment of the optical lens 100 , details will not be repeated here.

An optical lens, camera module and electronic equipment disclosed in the embodiments of the present invention have been introduced in detail above. In this paper, specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only used to help Understand the optical lens, camera module, electronic equipment and core ideas thereof of the present invention; at the same time, for those of ordinary skill in the art, according to the ideas of the present invention, there will be changes in the specific implementation and scope of application. Above all, the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. An optical lens system includes eight lens elements with refractive power, wherein the eight lens elements include, in order from an object side to an image side along an optical axis, 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;

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 refractive power has a convex image-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 refractive power has a concave object-side surface at a paraxial region thereof, and has a convex image-side surface at a paraxial region thereof;

the sixth lens element with refractive power has a concave image-side surface at a paraxial region;

the seventh lens element with positive refractive power has a convex object-side surface at paraxial region;

the eighth lens element with negative 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 optical lens satisfies the following relational expression:

1.63<f/D<1.7；

1.0<Imgh/f<1.1；

wherein f is the focal length of the optical lens, D is the entrance pupil diameter of the optical lens, and Imgh is the radius of the maximum effective imaging circle on the imaging surface of the optical lens.

2. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

1.1<TTL/Imgh<1.21；

wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical lens.

3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following relation:

2.7<|R7/f|<2.8；

wherein R7 is a curvature radius of an object-side surface of the fourth lens element on an optical axis.

4. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

5.8<|R6/f|<6.2；

wherein R6 is a curvature radius of an image-side surface of the third lens element on an optical axis.

5. An optical lens according to claim 1, characterized in that the optical lens satisfies the following relation:

0.7<AT12/(AT34+AT45)<0.9；

AT12 is an air gap between the first lens and the second lens on the optical axis, AT34 is an air gap between the third lens and the fourth lens on the optical axis, and AT45 is an air gap between the fourth lens and the fifth lens on the optical axis.

6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

0.8<SD11/SD51<0.9；

wherein SD11 is the maximum effective half aperture of the object-side surface of the first lens element, and SD51 is the maximum effective half aperture of the object-side surface of the fifth lens element.

7. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

1.6<(SD62-SD71)/(SD72-SD81)<2.1；

wherein SD62 is a maximum effective half aperture of an image-side surface of the sixth lens element, SD71 is a maximum effective half aperture of an object-side surface of the seventh lens element, SD72 is a maximum effective half aperture of an image-side surface of the seventh lens element, and SD81 is a maximum effective half aperture of an object-side surface of the eighth lens element.

8. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

0.9-woven fabric CT4/CT5<1.0; and/or

0.85<R9/R10<1.85；

Wherein CT4 is a thickness of the fourth lens element on the optical axis, CT5 is a thickness of the fifth lens element on the optical axis, R9 is a curvature radius of an object-side surface of the fifth lens element on the optical axis, and R10 is a curvature radius of an image-side surface of the fifth lens element on the optical axis.

9. A camera module, comprising the optical lens of any one of claims 1 to 8 and a photosensitive chip, wherein the photosensitive chip 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 in the housing.

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