CN114296213B - Optical lens, camera module and electronic equipment - Google Patents

Abstract

The invention discloses an optical lens, an image pickup module and electronic equipment, wherein the optical lens comprises 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 sequentially arranged from an object side to an image side along an optical axis, the first lens and the seventh lens have positive refractive power, the object side surfaces and the image side surfaces of the first lens and the second lens are respectively convex surfaces and concave surfaces at a paraxial region, the object side surface of the third lens is convex at the paraxial region, the image side surface of the fourth lens is convex at the paraxial region, the object side surface of the fifth lens is concave at the paraxial region, and the object side surface of the sixth lens is concave at the paraxial region; the seventh lens element has a convex object-side surface and a concave image-side surface at a paraxial region, and the eighth lens element has negative refractive power. The optical lens can realize miniaturized design of the optical lens while meeting high-quality imaging of the optical lens.

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

With the advancement of science and technology, electronic products with camera functions are developing rapidly, and consumers have higher and higher requirements for the imaging quality of electronic products. At the same time, the structural characteristics of lightness, thinness and miniaturization have gradually become the development trend of optical lenses. However, as the pixel size of the photosensitive chip in the optical lens continues to decrease, further design requirements are put forward for the miniaturization and high-quality imaging of the optical lens.

Contents of the invention

The embodiment of the invention discloses an optical lens, a camera module and an electronic device, which can realize the miniaturization design of the optical lens while satisfying high-quality imaging of the optical lens.

In order to achieve the above object, in the first aspect, the present invention discloses an optical lens, which includes a first lens, a second lens, a third lens, and a fourth lens arranged in sequence along the optical axis from the object side to the image side , 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 of the first lens The side surface is concave at the near optical axis; the second lens has a 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 object side of the third lens is convex at the near optical axis; the fourth lens has refractive power, and the image side of the fourth lens is convex at the near optical axis; The fifth lens has refractive power, and the object side of the fifth lens is concave at the near optical axis; the sixth lens has refractive power, and the object side of the sixth lens is concave at the near optical axis; The seventh lens has positive refractive power, the object side of the seventh lens is convex at the near optical axis, the image side of the seventh lens is concave at the near optical axis, and the object of the seventh lens Both the side and the image side are provided with at least one inflection point; the eighth lens has a negative refractive power, the object side of the eighth lens is a convex surface at the near optical axis, and the image side of the eighth lens is at the near optical axis. The optical axis is concave, and the eighth lens is provided with at least one inflection point on both the object side and the image side;

The optical lens satisfies the following relational formula: 1<TTL/ImgH<1.12; wherein, TTL is the distance from the object side of the first lens to the imaging plane of the optical lens on the optical axis, and ImgH is the distance of the optical lens The radius of the largest effective imaging circle of .

In the optical lens provided by the present application, the first lens has a positive refractive power, and the object sides of the first lens and the second lens are convex at the optical axis, and both image sides are concave at the optical axis, there will be It is beneficial for the incident light with a large angle to the optical axis to enter the optical lens, which is conducive to the convergence of the light rays of the optical lens and improves the optical performance of the optical lens. In addition, because the first lens and the second lens have convex and concave surfaces at the near optical axis structure, and the object side of the third lens is convex at the near optical axis, adopting this surface structure matching form can increase the surface adaptation of the front lens group (namely the first lens, the second lens and the third lens) To a certain extent, the incident angle of the incident light can be reduced, the generation of chromatic aberration can be further reduced, and the imaging quality of the optical lens can be improved. The surface design of the fourth lens and the fifth lens can cooperate with the object-side lens to further gather the incident light to compress the total length of the optical lens, while the refractive power provided by the sixth lens and the corresponding surface design can balance all aspects of the object-side. The difficult-to-correct aberrations brought about by the lens when converging the incident light reduce the correction pressure of the rear lens group. The object side and the image side of the seventh lens and the eighth lens are provided with at least one inflection point, which is beneficial to obtain a smaller light deflection angle for the light rays in the peripheral field of view. At the same time, the positive refractive power of the seventh lens combined with the eighth lens Provided with negative refractive power, lenses with positive and negative refractive power will offset each other’s aberrations, and the convex-concave surface design on the object side and image side at the optical axis can further converge the light in the central field of view, and can Shortening the total length of the optical lens and correcting aberrations can also suppress the outgoing angle of light, improve the light receiving efficiency of the photosensitive chip, further correct aberrations, and improve imaging quality.

In addition, by making the optical lens satisfy the following relationship: 1<TTL/ImgH<1.12, the total length of the optical lens can be controlled, and the assembly sensitivity of the optical lens can be reduced. To achieve a balance between the optical lens in the case of a small size, it also has a larger imaging surface to match the sensor with higher pixels, so that it can capture more details of the object.

As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relational expression: fno/tan(HFOV)<2; wherein, FNO is the aperture number of the optical lens, HFOV is half of the maximum field of view of the optical lens. When the above relationship is satisfied, it is beneficial for the optical lens to have a larger luminous flux, which is beneficial to improve the image surface brightness of the optical lens and improve the imaging definition, thereby improving the photosensitive performance of the image sensor and suppressing the vignetting phenomenon; Under the premise of the luminous flux, the field of view of the optical lens will not be overly compressed, which is conducive to realizing the characteristics of a large field of view and improving the imaging 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 relationship: tan(HFOV)/(distim*10)>6.5; wherein, HFOV is the optical lens half of the maximum field of view, and distim is the maximum optical distortion value of the optical lens. When the above relationship is satisfied, it is beneficial to reduce the degree of deformation of the optical lens with wide-angle characteristics during actual imaging, and effectively suppress the field curvature, distortion and other aberrations caused by wide-angle characteristics. It can effectively suppress the angle of off-axis field of view light incident on the image sensor, improve the response efficiency of the image sensor, help to correct the peripheral distortion of the image, ensure better performance of the optical lens, and then improve the imaging 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<f1/f<2; wherein, f1 is the focal length of the first lens, and f is the effective focal length of the optical lens. The refractive power of the first lens is configured within a reasonable range, that is, when the above relationship is satisfied, the first lens can provide a suitable positive refractive power, and can reasonably converge the incident light to compress the total length of the optical lens, and at the same time prevent the second The first lens produces aberrations that are difficult to correct. In addition, the positive refractive power of the first lens can also achieve reasonable deflection of light incident at a large angle relative to the optical axis, thereby helping to expand the field of view of the optical lens and effectively reduce the optical lens. The head size is shortened, the total length of the optical lens is shortened, and enough space is provided for increasing the size of the imaging surface.

As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 1.5<r72/f7<5.5; wherein, f7 is the focal length of the seventh lens; r72 is the radius of curvature of the image side of the seventh lens at the optical axis. When the above relational expression is satisfied, the shape of the seventh lens can be reasonably controlled, so that the seventh lens has a suitable degree of deflection, and under the condition of providing a suitable positive refractive power, the shape of the seventh lens is more controllable, and cooperates with the first The object side and image side of the seven lenses are designed with convex and concave surfaces respectively, which can shorten the total length of the optical lens and realize a miniaturized design. In addition, with the curvature and recursion of the image side of the seventh lens, it can effectively suppress the off-axis field of view The angle at which light is incident on the eighth lens reduces the correction pressure of the eighth lens, and at the same time helps to correct the peripheral distortion of the image produced by the front lens group. It can also correct off-axis aberrations and improve the relative illumination, improving the imaging of the optical lens quality.

As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: -2.5<r81/f8<-0.5; wherein, r81 is the object of the eighth lens The radius of curvature of the side surface at the optical axis, f8 is the focal length of the eighth lens. When the above relationship is satisfied, it is beneficial for the eighth lens to provide a reasonable negative refractive power. Cooperating with the curvature and inflection of the object side of the eighth lens, it can effectively suppress the angle at which the off-axis field of view light is incident on the image sensor, so as to adjust the light The angle of the incident imaging surface better matches the photosensitive chip and improves the response efficiency of the image sensor. At the same time, it helps to correct the peripheral distortion of the image and improve the relative illumination. It is also conducive to correcting the astigmatism of the optical lens and reducing the optical lens distortion.

As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 1<r31/r22<5.5; wherein, r31 is the object side of the third lens at The radius of curvature at the optical axis; r22 is the radius of curvature of the image side of the second lens at the optical axis. When the above relationship is satisfied, the object side of the third lens and the image side of the second lens have sufficient degrees of freedom to bend, which facilitates the smooth transmission of light and is beneficial to correct aberrations such as astigmatism and field curvature of the optical lens. When it is lower than the lower limit of the above relational expression, the object side of the third lens has insufficient bending freedom, and the image side of the second lens is too curved, which is easy to produce marginal field of view aberration, which is not conducive to correcting the aberration of the optical lens; When the upper limit of the above relationship is reached, the image side of the second lens has insufficient bending freedom, and the object side of the third lens is too curved, which is also prone to produce marginal field aberrations, and the object side of the third lens has a complex shape, which is not conducive to Processing and molding of the third 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: at14/TTL≤0.11; wherein, at14 is the first lens to the fifth lens The sum of the air gaps on the optical axis. By controlling the ratio of the sum of the air gaps between the first lens to the fifth lens to the total length of the optical lens, that is, when the above relationship is satisfied, it is beneficial for the optical lens to have sufficient air gaps to ensure the stability and good imaging of the optical lens quality. At the same time, it is also beneficial to shorten the total length of the optical lens, facilitate miniaturization design, reduce the difficulty of assembling each lens, and improve the stability of assembly.

As an optional implementation manner, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: sd82/ct8<8.9; wherein, sd82 is the maximum effective Semi-diameter, ct8 is the thickness of the eighth lens on the optical axis. When the above relationship is satisfied, the thickness of the eighth lens can be reasonably configured, and then the lens surface shape can be reasonably configured, so that large-angle light rays are incident on the image sensor, which is conducive to realizing the large image surface characteristics of the optical lens to match higher The pixel chip can also reduce the tolerance sensitivity of the eighth lens, reduce the pressure of the arrangement of the lens barrel structure, and facilitate the molding and assembly of the eighth lens. When the upper limit of the above relational expression is exceeded, the outer diameter of the eighth lens is too large, so that the assembly stability of the eighth lens is reduced, which is likely to cause defects during the molding and assembly process and increase the cost.

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 can improve the imaging quality, reduce the total length of the optical lens, realize miniaturization design, and reduce the sensitivity of the optical lens. At the same time, it can also have a larger imaging surface to match higher pixels. photosensitive chip.

In a third aspect, the present invention discloses an electronic device, the electronic device includes a casing and the camera module according to the second aspect, and the camera module is arranged in the casing. The electronic device with the camera module can improve the imaging quality of the optical lens, reduce the total length of the optical lens, realize a miniaturized design, and reduce the sensitivity of the optical lens. At the same time, it can also have a larger imaging surface to match Higher pixel photosensitive chip.

Compared with the prior art, the beneficial effect of the present invention lies in: an optical lens, a camera module and an electronic device provided by the embodiment of the present invention, the optical lens adopts eight lenses, and by rationally configuring the refractive power of each lens And the surface shape, and make the optical lens satisfy the relationship: 1<TTL/ImgH<1.12, which can correct the aberration of the optical lens, improve the imaging quality of the optical lens, reduce the total length of the optical lens, and reduce the sensitivity of the optical lens. At the same time, It is beneficial for the optical lens to achieve a balance between miniaturized design and large imaging surface, so that the optical lens has a larger imaging surface in the case of a small size, so as to match the photosensitive chip with higher pixels, and then be able to shoot Objects with more detail.

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 the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm) and 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 the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm) and 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 the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm) and 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;

8 is a diagram of longitudinal spherical aberration (mm), astigmatism curve (mm) and distortion curve (%) 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 (mm), an astigmatism curve diagram (mm) 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;

12 is a diagram of longitudinal spherical aberration (mm), astigmatism curve (mm) and distortion curve (%) of the optical lens disclosed in the sixth embodiment of the present application;

Fig. 13 is a schematic structural view of the optical lens disclosed in the seventh embodiment of the present application;

Fig. 14 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the seventh embodiment of the present application;

Fig. 15 is a schematic structural view of the camera module disclosed in the present application;

FIG. 16 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 a positive refractive power, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 have a refractive power (such as a positive refractive power or a negative refractive power), and the second lens L2 has a refractive power. The seventh lens L7 has positive refractive power, and the eighth lens L8 has negative refractive power.

Further, the object side S1 and image side S2 of the first lens L1 are respectively convex and concave at the near optical axis O; the object side S3 and image side S4 of the second lens L2 are respectively convex and concave at the near optical axis O The object side S5 of the third lens L3 is convex at the near optical axis O, and the image side S6 of the third lens L3 is convex or concave at the near optical axis O; the object side S7 of the fourth lens L4 is at the near optical axis O The image side S8 of the fourth lens L4 is convex at the near optical axis O; the object side S9 of the fifth lens L5 is convex at the near optical axis O, and the image side S10 of the fifth lens L5 is at the near optical axis O. The optical axis O is a concave surface; the object side S11 of the sixth lens L6 is a convex surface at the near optical axis O, and the image side S12 of the sixth lens L6 is concave at the near optical axis O; the object side S13 of the seventh lens L7, The image side S14 is respectively convex and concave at the near optical axis O, and at least one inflection point is provided on both the object side S13 and the image side S14 of the seventh lens L7. The object side S15 and the image side S16 of the eighth lens L8 are respectively convex and concave at the near optical axis O, and at least one inflection point is provided on the object side S15 and the image side S16 of the eighth lens L8.

It can be known from the above that the first lens L1 of the optical lens 100 has a positive refractive power, and the object sides of the first lens L1 and the second lens L2 are convex at the optical axis O, and the image sides of the two are at the optical axis O. Both are concave, which will help the incident light with a large angle to the optical axis to enter the optical lens 100, which is conducive to the convergence of the light rays of the optical lens 100, and improves the optical performance of the optical lens 100. In addition, because the first lens L1 and the second lens L2 The surface at the near optical axis O is convex-concave, and the object side S5 of the third lens L3 is convex at the near optical axis O. With this surface structure, the front lens group (i.e. the first lens group) can be increased. The degree of surface adaptation of the lens L1 , the second lens L2 and the third lens L3 ) can reduce the incident angle of the incident light, further reduce the occurrence of chromatic aberration, and improve the imaging quality of the optical lens 100 . The surface design of the fourth lens L4 and the fifth lens L5 can cooperate with the object-side lens to further converge the incident light to compress the total length of the optical lens 100, and with the refractive power provided by the sixth lens L6 and the corresponding surface design, it can Balance the difficult-to-correct aberrations caused by each lens on the object side when converging incident light, and reduce the correction pressure of the rear lens group. The object side and the image side of the seventh lens L7 and the eighth lens L8 are provided with at least one inflection point, which is beneficial to obtain a smaller light deflection angle for the light rays in the peripheral field of view. At the same time, the positive refractive power of the seventh lens L7 combines The negative refractive power provided by the eighth lens L8, the positive and negative refractive power lenses will cancel each other’s aberrations, and the convex-concave surface design of the object side S15 and the image side S16 at the optical axis O can further converge The light in the central field of view can shorten the total length of the optical lens 100 and correct aberrations. At the same time, it can also suppress the outgoing angle of the light, improve the light receiving efficiency of the photosensitive chip, further correct the aberrations, and improve the imaging quality.

In some embodiments, the optical lens 100 can be applied to electronic devices such as smart phones and smart tablets, then the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens The materials of the lens L6 , the seventh lens L7 and the eighth lens L8 can be made of plastic, so that the optical lens 100 has good optical effect and good portability. In addition, the plastic material is easier to process the lens, thereby reducing the processing cost of the optical lens 100 .

In some embodiments, the optical lens 100 further includes a diaphragm 102 , which can be an aperture stop 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 aperture 102 can also be arranged between two adjacent lenses, for example, between the second lens L2 and the third lens L3, and the setting can be adjusted according to the actual situation. The embodiment does not specifically limit this.

In some embodiments, the optical lens 100 also includes a filter L9, such as an infrared filter, and the infrared filter is arranged between the image side S16 of the eighth lens L8 and the imaging surface 101 of the optical lens 100, thereby filtering out Other wavelengths of light such as visible light, but only allow infrared light to pass through, therefore, the optical lens 100 can be used as an infrared optical lens, that is, the optical lens 100 can also image in dim environments and other special application scenarios and can obtain Better image quality.

In some embodiments, the optical lens 100 satisfies the following relationship: 1<TTL/ImgH<1.12, can control the total length of the optical lens 100, reduce the assembly sensitivity of the optical lens 100, and at the same time, help the optical lens 100 in miniaturization design and A balance is achieved between the large imaging surface 101 , so that the optical lens 100 has a relatively large imaging surface 101 in a case of a small size, so as to match a sensor with higher pixels, thereby being able to capture more details of an object.

In some embodiments, the optical lens 100 satisfies the following relationship fno/tan(HFOV)<2; wherein, FNO is the f-number of the optical lens 100 , and HFOV is half of the maximum field of view of the optical lens 100 . When the above relational expression is satisfied, it is beneficial for the optical lens 100 to have a larger luminous flux, which is conducive to improving the image surface brightness of the optical lens 100, improving the imaging definition, thereby improving the photosensitive performance of the photosensitive chip and suppressing the vignetting phenomenon; in addition, in On the premise of sufficient luminous flux, the field of view of the optical lens 100 will not be overly compressed, which is conducive to realizing the feature of a large field of view and improving the imaging quality of the optical lens 100 .

In some embodiments, the optical lens 100 satisfies the following relationship tan(HFOV)/(distim*10)>6.5; wherein, HFOV is half of the maximum field of view of the optical lens 100, and distim is the maximum optical distortion value of the optical lens 100 . When the above relational expression is satisfied, it is beneficial to reduce the degree of deformation of the optical lens 100 with wide-angle characteristics during actual imaging, effectively suppress the field curvature, distortion and other aberrations caused by the wide-angle characteristics, and at the same time cooperate with the surface design of each lens , which can effectively suppress the incident angle of light from the off-axis field of view on the photosensitive chip, improve the response efficiency of the photosensitive chip, help to correct peripheral distortion of the image, ensure better performance of the optical lens 100, and further improve the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relational expression 1<f1/f<2; wherein, f1 is the focal length of the first lens L1, and f is the effective focal length of the optical lens 100 . The refractive power of the first lens L1 is configured within a reasonable range, that is, when the above relationship is satisfied, the first lens L1 can provide a suitable positive refractive power, and can reasonably converge the incident light to compress the total length of the optical lens. Prevent the first lens from producing aberrations that are difficult to correct. In addition, the positive refractive power of the first lens can also achieve reasonable deflection of light incident at a large angle relative to the optical axis, thereby helping to expand the field of view of the optical lens and effectively reducing The head size of the optical lens 100 shortens the total length of the optical lens 100 to provide enough space for increasing the size of the imaging surface 101 .

In some embodiments, the optical lens 100 satisfies the following relationship: 1.5<r72/f7<5.5; wherein, f7 is the focal length of the seventh lens L7; r72 is the radius of curvature of the image side of the seventh lens L7 at the optical axis O. When the above relational expression is satisfied, the shape of the seventh lens L7 can be reasonably controlled, so that the seventh lens L7 has an appropriate deflection degree, and under the condition of providing an appropriate positive refractive power, the shape of the seventh lens L7 is more controllable, In addition, the object side S13 and the image side S14 of the seventh lens L7 are designed to be convex and concave respectively, which can shorten the total length of the optical lens 100 and realize a miniaturized design. In addition, the curvature and reflection of the image side S14 of the seventh lens L7 Curved, can effectively suppress the angle of off-axis field of view light incident on the eighth lens L8, reduce the correction pressure of the eighth lens L8, and help to correct the peripheral distortion of the image produced by the front lens group, and can also correct off-axis images Differentiate and improve the relative illuminance, and improve the imaging quality of the optical lens 100 .

In some embodiments, the optical lens 100 satisfies the following relational expression -2.5<r81/f8<-0.5; wherein, r81 is the radius of curvature of the object side surface S15 of the eighth lens L8 at the optical axis O, and f8 is the radius of the eighth lens L8 focal length. When the above relational expression is satisfied, it is beneficial for the eighth lens L8 to provide a reasonable negative refractive power. Cooperating with the curvature and inflection of the object side S15 of the eighth lens L8, it can effectively suppress the angle at which the off-axis field of view light is incident on the photosensitive chip. By adjusting the angle at which the light enters the imaging surface 101 , it can better match the photosensitive chip, and at the same time, it is beneficial to correct the astigmatism of the optical lens 100 and reduce the distortion of the optical lens 100 .

In some embodiments, the optical lens 100 satisfies the following relational expression 1<r31/r22<5.5; wherein, r31 is the radius of curvature of the object side S5 of the third lens L3 at the optical axis O; r22 is the image side of the second lens L2 The radius of curvature at the optical axis O. When the above relational expression is satisfied, the object side S5 of the third lens L3 and the image side S4 of the second lens L2 have sufficient bending freedom, which is convenient for smooth transmission of light, and is conducive to correcting images such as astigmatism and field curvature of the optical lens 100. Difference. When it is lower than the lower limit of the above relational expression, the object side S5 of the third lens L3 has insufficient bending freedom, while the image side S4 of the second lens L2 is too curved, which is prone to produce marginal field aberrations, which is not conducive to correcting the optical lens 100. Aberration; when the upper limit of the above relationship is exceeded, the image side S4 of the second lens L2 has insufficient bending freedom, and the object side S5 of the third lens L3 is too curved, which is also prone to marginal field of view aberrations, and the third lens The object side surface S5 of L3 has a complicated surface shape, which is not conducive to the processing and molding of the third lens L3.

In some embodiments, the optical lens 100 satisfies the following relationship at14/TTL≦0.11; wherein at14 is the sum of the air gaps of the first lens L1 to the fifth lens L5 on the optical axis O. By controlling the ratio of the sum of the air gaps between the first lens L1 to the fifth lens L5 to the total length of the optical lens 100, that is, when the above relational expression is satisfied, the optical lens 100 has enough air gaps to ensure the stability of the optical lens 100 and good imaging quality. At the same time, it is also beneficial to shorten the total length of the optical lens 100, which facilitates miniaturization design, reduces the difficulty of assembling each lens, and improves the stability of assembling.

In some embodiments, the optical lens 100 satisfies the following relational expression sd82/ct8<8.9; wherein, sd82 is the maximum effective semi-diameter of the image side of the eighth lens L8, and ct8 is the thickness of the eighth lens L8 on the optical axis O. When the above relational expression is satisfied, the thickness of the eighth lens L8 can be reasonably configured, and then the lens surface shape can be reasonably configured, so that large-angle light rays are incident on the photosensitive chip, which is conducive to realizing the large image surface characteristics of the optical lens 100 to match A chip with higher pixels can also reduce the tolerance sensitivity of the eighth lens, reduce the pressure of the arrangement of the lens barrel structure, and facilitate the molding and assembly of the eighth lens L8. When the upper limit of the above relational expression is exceeded, the outer diameter of the eighth lens L8 is too large, so that the assembly stability of the eighth lens L8 is reduced, and it is easy to cause defects in the molding and assembly process and increase the cost.

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

first embodiment

The structure schematic diagram of the optical lens 100 disclosed in the first embodiment of the present application is shown in FIG. L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the filter L9, the first lens L1 has a positive refractive power, the second lens L2 With negative refractive power, third lens L3 and fourth lens L4 have positive refractive power, fifth lens L5 and sixth lens L6 have negative refractive power, seventh lens L7 has positive refractive power, and eighth lens L8 has negative refractive power .

Further, the object side S1 and the image side S2 of the first lens L1 are respectively convex and concave at the near optical axis O, and the object side S3 and image side S4 of the second lens L2 are respectively convex and concave at the near optical axis O , the object side S5 and the image side S6 of the third lens L3 are convex at the near optical axis O, the object side S7 and the image side S8 of the fourth lens L4 are respectively concave and convex at the near optical axis O, and the fifth lens The object side S9 and image side S10 of L5 are both concave at the near optical axis O, the object side S11 and image side S12 of the sixth lens L6 are concave and convex at the near optical axis O, respectively, and the object side of the seventh lens L7 S13 and the image side S14 are respectively convex and concave at the near optical axis O, and the object side S15 and image side S16 of the eighth lens L8 are respectively convex and concave at the near optical axis O. The object side S1 and the image side S2 of the first lens L1 are respectively concave and convex at the circumference, the object side S3 and the image side S4 of the second lens L2 are respectively convex and concave at the circumference, and the object side S5 of the third lens L3 , the image side S6 is convex at the circumference, the object side S7 and the image side S8 of the fourth lens L4 are concave at the circumference, the object side S9 and the image side S10 of the fifth lens L5 are convex and concave respectively at the circumference The object side S11 and the image side S12 of the sixth lens L6 are respectively convex and concave at the circumference, the object side S13 and image side S14 of the seventh lens L7 are respectively convex and concave at the circumference, and the object side of the eighth lens L8 S15 and image side S16 are respectively concave and convex at the circumference. It should be noted that both the object side and the image side of the seventh lens L7 and the eighth lens L8 have inflection points.

Specifically, taking the effective focal length f=4.738mm of the optical lens 100, the maximum field of view FOV=96.35° of the optical lens 100, the total optical length TTL of the optical lens 100=5.8mm, and the aperture size FNO=2.1 as examples, the optical lens Other parameters of 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 2 and 3 correspond to the object side S1 and 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 arranged on the image side of the apex of the rear surface. If the thickness of the diaphragm 102 is a positive value, the diaphragm 102 is behind The object 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 effective focal length of the lens in Table 1 is 555 nm, and the reference wavelength of the refractive index and Abbe number of the lens material is 587.6 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 defined by but not limited to the following aspheric surface formula :

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, A16, A18 and A20 that can be used for each aspheric mirror surface S1-S16 in the first embodiment.

Table 2

Please refer to (A) in FIG. 2 . (A) in FIG. 2 shows longitudinal spherical aberration diagrams of the optical lens 100 in the first embodiment at wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm. In (A) of FIG. 2 , the abscissa along the X-axis direction represents focus shift, and the ordinate along the Y-axis direction represents a 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 nm. Wherein, the abscissa along the X-axis direction represents the focal shift, and the ordinate along the Y-axis direction represents the image height, and the unit is mm. The astigmatism curve represents the curvature T of the meridional imaging plane and the curvature S of the sagittal imaging plane. It can be seen from (B) in FIG. 2 that at this wavelength, the astigmatism of the optical lens 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 nm. Wherein, the abscissa along the X-axis direction represents the distortion, and the ordinate along the Y-axis direction represents the image height, and the unit is mm. It can be seen from (C) in FIG. 2 that the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.

second embodiment

The structure schematic diagram of the optical lens 100 disclosed in the second embodiment of the present application is shown in FIG. L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8 and filter L9, the refractive power of each lens is the same as that of the first embodiment The refractive power of the lens is consistent.

Further, in the second embodiment, the difference between the surface type of each lens and the surface type of each lens in the first embodiment is that: the object side S5 and the image side S6 of the third lens L3 are respectively at the near optical axis O. are convex and concave, the object side S9 and image side S10 of the fifth lens L5 are respectively concave and convex at the near optical axis O, the object side S5 and image side S6 of the third lens L3 are respectively concave and convex at the circumference, The object side S9 and the image side S10 of the fifth lens L5 are concave at the circumference, and the object side S11 and the image side S12 of the sixth lens L6 are convex at the circumference. It should be noted that both the object side and the image side of the seventh lens L7 and the eighth lens L8 have inflection points.

Specifically, taking the effective focal length f=4.601mm of the optical lens 100, the maximum field of view FOV=97.85° of the optical lens 100, the total optical length TTL=5.999mm of the optical lens 100, and the aperture size FNO=1.73 as examples, the optical lens 100 The other parameters of are given in Table 3 below, and the definition of each parameter can be obtained from the description of the foregoing embodiments. It can be understood that the units of Y radius, thickness and focal length in Table 3 are mm. In Table 3, the reference wavelength of the effective focal length of the lens is 555 nm, and the reference wavelength of the refractive index and Abbe number of the lens material is 587.6 nm.

table 3

In the second embodiment, Table 4 shows the high-order term coefficients that can be used for each aspheric mirror surface in the second embodiment, wherein each aspheric surface type can be defined by the formula given in the first embodiment.

Table 4

Please refer to FIG. 4, from the (A) longitudinal spherical aberration diagram, (B) astigmatism curve diagram and (C) distortion curve diagram in FIG. control, so that the optical lens 100 of this embodiment has good imaging quality. In addition, for the wavelengths corresponding to the curves in (A) in Figure 4, (B) in Figure 4, and (C) in Figure 4, please refer to (A) in Figure 2 and Figure 2 in the first embodiment. The content described in (B) in FIG. 2 and (C) in FIG. 2 will not be repeated here.

third embodiment

The structural diagram of the optical lens 100 disclosed in the third embodiment of the present application is shown in FIG. 5 . The optical lens 100 includes a diaphragm 102 , a first lens L1 , and 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, eighth lens L8 and filter L9, the refractive power of each lens is the same as that of the first embodiment The refractive power of the lens is consistent.

Further, in the third embodiment, the surface shape of each lens differs from that in the first embodiment in that: both the object side S9 and the image side S10 of the fifth lens L5 are concave at the circumference. It should be noted that both the object side and the image side of the seventh lens L7 and the eighth lens L8 have inflection points.

Specifically, taking the effective focal length f=4.368mm of the optical lens 100, the maximum field of view FOV=101° of the optical lens 100, the total optical length TTL=5.44mm of the optical lens 100, and the aperture size FNO=2.2 as examples, the optical lens 100 The other parameters of are given in Table 5 below, and the definition of each parameter can be obtained from the description of the foregoing embodiments. It can be understood that the units of Y radius, thickness, and focal length in Table 5 are mm. In Table 5, the reference wavelength of the effective focal length of the lens is 555 nm, and the reference wavelength of the refractive index and Abbe number of the lens material is 587.6 nm.

table 5

In the third embodiment, Table 6 shows the high-order term coefficients that can be used for each aspheric mirror surface in the third embodiment, wherein each aspheric surface type can be defined by the formula given in the first embodiment.

Table 6

Please refer to Fig. 6, from the (A) longitudinal spherical aberration diagram, (B) astigmatism curve diagram and (C) distortion curve diagram in Fig. control, so that the optical lens 100 of this embodiment has good imaging quality. In addition, for the wavelengths corresponding to the curves in (A) in Figure 6, (B) in Figure 6, and (C) in Figure 6, please refer to (A) in Figure 2 and Figure 2 in the first embodiment. The content described in (B) in FIG. 2 and (C) in FIG. 2 will not be repeated here.

Fourth embodiment

The structural diagram of the optical lens 100 disclosed in the fourth embodiment of the present application is shown in FIG. L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8 and filter L9, the refractive power of each lens is the same as that of the first embodiment The difference in refractive power of the lenses is that the sixth lens L6 has positive refractive power.

Further, in the fourth embodiment, the difference between the surface type of each lens and the surface type of each lens in the first embodiment is that: the object side S1 and the image side S2 of the first lens L1 are concave at the circumference, The object side S5 and the image side S6 of the third lens L3 are respectively convex and concave at the circumference, the object side S9 and the image side S10 of the fifth lens L5 are concave at the circumference, and the object side S11 and the image of the sixth lens L6 are concave. The side surfaces S12 are convex at the circumference. It should be noted that both the object side and the image side of the seventh lens L7 and the eighth lens L8 have inflection points.

Specifically, taking the effective focal length f=4.738mm of the optical lens 100, the maximum field of view FOV=96.202° of the optical lens 100, the total optical length TTL=5.9mm of the optical lens 100, and the aperture size FNO=2.05 as examples, the optical lens 100 The other parameters of are given in Table 7 below, and the definition of each parameter can be obtained from the description of the foregoing embodiments. It can be understood that the units of Y radius, thickness and focal length in Table 7 are mm. In Table 7, the reference wavelength of the effective focal length of the lens is 555 nm, and the reference wavelength of the refractive index and Abbe number of the lens material is 587.6 nm.

Table 7

In the fourth embodiment, Table 8 shows the high-order term coefficients that can be used for each aspheric mirror surface in the fourth embodiment, wherein each aspheric surface type can be defined by the formula given in the first embodiment.

Table 8

Please refer to FIG. 8 , from the (A) longitudinal spherical aberration diagram, (B) astigmatism curve diagram and (C) distortion curve diagram in FIG. control, so that the optical lens 100 of this embodiment has good imaging quality. In addition, for the wavelengths corresponding to the curves in (A) in Figure 8, (B) in Figure 8, and (C) in Figure 8, please refer to (A) in Figure 2 and Figure 2 in the first embodiment. The content described in (B) in FIG. 2 and (C) in FIG. 2 will not be repeated here.

fifth embodiment

The structural diagram of the optical lens 100 disclosed in the fifth embodiment of the present application is shown in FIG. L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8 and filter L9, the refractive power of each lens is the same as that of the first embodiment The difference in refractive power of the lenses is that the third lens L3 has negative refractive power, and the fifth lens L5 has positive refractive power.

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 object side S5 and the image side S6 of the third lens L3 are respectively at the near optical axis O. The object side S7 and the image side S8 of the fourth lens L4 are convex at the near optical axis O, and the object side S9 and image side S10 of the fifth lens L5 are concave and convex at the near optical axis O, respectively. , the object side S3 and image side S4 of the second lens L2 are both concave surfaces at the circumference, the object side S5 and image side S6 of the third lens L3 are respectively concave and convex at the circumference, the object side S9 and the fifth lens L5 are The image side S10 is concave at the circumference, and the object side S11 and the image side S12 of the sixth lens L6 are convex at the circumference. It should be noted that both the object side and the image side of the seventh lens L7 and the eighth lens L8 have inflection points.

Specifically, taking the effective focal length f=4.707mm of the optical lens 100, the maximum field of view FOV=96.808° of the optical lens 100, the total optical length TTL=5.85mm of the optical lens 100, and the aperture size FNO=2.15 as examples, the optical lens 100 The other parameters of are given in Table 9 below, and the definition of each parameter can be obtained from the description of the foregoing embodiments. It can be understood that the units of Y radius, thickness and focal length in Table 9 are mm. In Table 9, the reference wavelength of the effective focal length of the lens is 555 nm, and the reference wavelength of the refractive index and Abbe number of the lens material is 587.6 nm.

Table 9

In the fifth embodiment, Table 10 shows the high-order term coefficients that can be used for each aspheric mirror surface in the fifth embodiment, wherein each aspheric surface type can be defined by the formula given in the first embodiment.

Table 10

Please refer to Fig. 10, from the (A) longitudinal spherical aberration diagram, (B) astigmatism curve diagram and (C) distortion curve diagram in Fig. 10, it can be seen that the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are all well obtained control, so that the optical lens 100 of this embodiment has good imaging quality. In addition, for the wavelengths corresponding to the curves in (A) in Figure 10, (B) in Figure 10, and (C) in Figure 10, please refer to (A) in Figure 2 and Figure 2 in the first embodiment. The content described in (B) in FIG. 2 and (C) in FIG. 2 will not be repeated here.

Sixth embodiment

The structure schematic diagram of the optical lens 100 disclosed in the sixth embodiment of the present application is shown in FIG. L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8 and filter L9, the refractive power of each lens is the same as that of the first embodiment The difference in the refractive power of the lenses is that the second lens L2 has positive refractive power.

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 object side S5 and the image side S6 of the third lens L3 are respectively at the near optical axis O. The object side S9 and the image side S10 of the fifth lens L5 are respectively concave and convex at the near optical axis O, and the object side S11 and image side S12 of the sixth lens L6 are concave at the near optical axis O. The object side S1 and the image side S2 of the first lens L1 are both concave surfaces at the circumference, the object side S5 and the image side S6 of the third lens L3 are respectively convex and concave at the circumference, and the object side S9 and the fifth lens L5 are The image side S10 is concave at the circumference, and the object side S11 and the image side S12 of the sixth lens L6 are convex at the circumference. It should be noted that both the object side and the image side of the seventh lens L7 and the eighth lens L8 have inflection points.

Specifically, taking the effective focal length f=4.592mm of the optical lens 100, the maximum field of view FOV=98.056° of the optical lens 100, the total optical length TTL=5.95mm of the optical lens 100, and the aperture size FNO=1.85 as examples, the optical lens 100 The other parameters of are given in Table 11 below, and the definition of each parameter can be obtained from the description of the foregoing embodiments. 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 effective focal length of the lens in Table 11 is 555 nm, and the reference wavelength of the refractive index and Abbe number of the lens material is 587.6 nm.

Table 11

In the sixth embodiment, Table 12 shows the high-order term coefficients that can be used for each aspheric mirror surface in the sixth embodiment, wherein each aspheric surface type can be defined by the formula given in the first embodiment.

Table 12

Please refer to FIG. 12, from the (A) longitudinal spherical aberration diagram, (B) astigmatism curve diagram and (C) distortion curve diagram in FIG. control, so that the optical lens 100 of this embodiment has good imaging quality. In addition, for the wavelengths corresponding to the curves in (A) in Figure 12, (B) in Figure 12, and (C) in Figure 12, please refer to (A) in Figure 2 and Figure 2 in the first embodiment. The content described in (B) in FIG. 2 and (C) in FIG. 2 will not be repeated here.

Seventh embodiment

The structural diagram of the optical lens 100 disclosed in the seventh embodiment of the present application is shown in FIG. L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8 and filter L9, the refractive power of each lens is the same as that of the first embodiment The difference in refractive power of the lenses is that the fourth lens L4 has negative refractive power.

Further, in the seventh embodiment, the difference between the surface type of each lens and the surface type of each lens in the first embodiment is that: the object side S3 and the image side S4 of the second lens L2 are concave at the circumference, The object side S9 and the image side S10 of the fifth lens L5 are concave at the circumference, the object side S11 and the image side S12 of the sixth lens L6 are convex at the circumference, and the object side S13 and image S14 of the seventh lens L7 are concave. Both are concave at the circumference, and the object side S15 and the image side S16 of the eighth lens L8 are both convex at the circumference. It should be noted that both the object side and the image side of the seventh lens L7 and the eighth lens L8 have inflection points.

Specifically, taking the effective focal length f=4.542mm of the optical lens 100, the maximum field of view FOV=98.598° of the optical lens 100, the total optical length TTL=5.65mm of the optical lens 100, and the aperture size FNO=2.2 as examples, the optical lens 100 The other parameters of are given in Table 13 below, and the definition of each parameter can be obtained from the description of the foregoing embodiments. It can be understood that the units of the Y radius, thickness and focal length in Table 13 are mm. In Table 13, the reference wavelength of the effective focal length of the lens is 555 nm, and the reference wavelength of the refractive index and Abbe number of the lens material is 587.6 nm.

Table 13

In the seventh embodiment, Table 14 shows the high-order term coefficients that can be used for each aspheric mirror surface in the seventh embodiment, wherein each aspheric surface type can be defined by the formula given in the first embodiment.

Table 14

Please refer to FIG. 14, from the (A) longitudinal spherical aberration diagram, (B) astigmatism curve diagram and (C) distortion curve diagram in FIG. control, so that the optical lens 100 of this embodiment has good imaging quality. In addition, for the wavelengths corresponding to the curves in (A) in Figure 14, (B) in Figure 14, and (C) in Figure 14, please refer to (A) in Figure 2 and Figure 2 in the first embodiment. The content described in (B) in FIG. 2 and (C) in FIG. 2 will not be repeated here.

Please refer to Table 15. Table 15 is a summary of the ratios of the relational expressions in the first embodiment to the seventh embodiment of the present application.

Table 15

Referring to FIG. 15 , the present invention discloses a camera module 200 . The camera module 200 includes a photosensitive chip 201 and the above-mentioned optical lens 100 . 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. The camera module 200 with the optical lens 100 can improve the imaging quality of the optical lens 100, reduce the total length of the optical lens 100, realize miniaturization design, and reduce the sensitivity of the optical lens 100, and at the same time, can also have a larger imaging surface , to match higher pixel photosensitive chips.

Please refer to FIG. 16 , the present invention discloses an electronic device 300 . The electronic device 300 includes a housing 301 and the aforementioned camera module 200 . The camera module 200 is set on the housing 301 to acquire 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, and the like. The electronic device 300 with the camera module 200 can improve the imaging quality of the optical lens 100, reduce the total length of the optical lens 100, realize a miniaturized design, and reduce the sensitivity of the optical lens 100, and at the same time, can also have a larger imaging surface , to match higher pixel photosensitive chips.

The 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 present invention. Invented optical lens, camera module and electronic equipment and their core ideas; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application range. In summary, The contents of this description should not be construed as limiting the present invention.

Claims (7)

1. an optical lens, it is characterized in that, described optical lens has eight lenses with refractive power in total, and eight described lenses comprise the first lens, the second lens, the second lens that are arranged in sequence along the optical axis from the object side to the image side 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 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 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 a refractive power, and the object side of the third lens is convex at the near optical axis; The fourth lens has a refractive power, and the image side of the fourth lens is convex at the near optical axis; The fifth lens has refractive power, and the object side of the fifth lens is concave at the near optical axis; The sixth lens has refractive power, and the object side of the sixth lens is concave at the near optical axis; The seventh lens has positive refractive power, the object side of the seventh lens is convex at the near optical axis, the image side of the seventh lens is concave at the near optical axis, and the object of the seventh lens At least one inflection point is set in both the side surface and the image side; The eighth lens has negative refractive power, the object side of the eighth lens is convex at the near optical axis, the image side of the eighth lens is concave at the near optical axis, and the object of the eighth lens is concave. At least one inflection point is set in both the side surface and the image side; The optical lens satisfies the following relationship: 1<TTL/ImgH<1.12, 1.508≤fno/tan(HFOV)<2, 1<f1/f≤1.53, and -2.04≤r81/f8<-0.5; Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, ImgH is the radius of the maximum effective imaging circle of the optical lens, and FNO is the aperture number of the optical lens , HFOV is half of the maximum field of view of the optical lens, f1 is the focal length of the first lens, f is the effective focal length of the optical lens, r81 is the object side of the eighth lens at the optical axis Radius of curvature, f8 is the focal length of the eighth lens. 2. The optical lens according to claim 1, wherein the optical lens satisfies the following relational expression: 1.5<r72/f7<5.5; Wherein, f7 is the focal length of the seventh lens; r72 is the radius of curvature of the image side of the seventh lens at the optical axis. 3. The optical lens according to claim 1, wherein the optical lens satisfies the following relational expression: 1<r31/r22<5.5; Wherein, r31 is the radius of curvature of the object side of the third lens at the optical axis; r22 is the radius of curvature of the image side of the second lens at the optical axis. 4. The optical lens according to claim 1, wherein the optical lens satisfies the following relational expression: at14/TTL≤0.11; Wherein, at14 is the sum of the air gaps of the first lens to the fifth lens on the optical axis. 5. The optical lens according to claim 1, wherein the optical lens satisfies the following relational expression: sd82/ct8<8.9; Wherein, sd82 is the maximum effective semi-diameter of the image side of the eighth lens, and ct8 is the thickness of the eighth lens on the optical axis. 6. A camera module, characterized in that the camera module comprises a photosensitive chip and the optical lens according to any one of claims 1-5, and the photosensitive chip is arranged on the image side of the optical lens. 7 . An electronic device, characterized in that the electronic device comprises a casing and the camera module according to claim 6 , the camera module is arranged on the casing.

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