CN114740593A

CN114740593A - Optical lens, camera module and electronic equipment

Info

Publication number: CN114740593A
Application number: CN202210217952.3A
Authority: CN
Inventors: 李翔宇; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2022-03-07
Filing date: 2022-03-07
Publication date: 2022-07-12
Anticipated expiration: 2042-03-07
Also published as: CN114740593B

Abstract

The invention discloses an optical lens, a camera module and an electronic device, wherein the optical lens comprises a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element which are arranged in sequence from an object side to an image side along an optical axis, the first lens element and the third lens element have positive refractive power, the second lens element, the seventh lens element and the eighth lens element have negative refractive power, an object side surface and an image side surface of the first lens element, the second lens element, the third lens element, the sixth lens element and the seventh lens element are respectively a convex surface and a concave surface at a paraxial region, an image side surface of the fifth lens element is a convex surface at the paraxial region, an object side surface and an image side surface of the eighth lens element are both concave at the paraxial region, and the optical lens element satisfies the following relational expressions: 2.1< Fno/tan (hfov) < 2.5. The invention provides an optical lens, a camera module and an electronic device, which can improve the light inlet quantity and the imaging definition of the optical lens while realizing the miniaturization design 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

At present, with the development of the camera technology, people have higher and higher requirements on the imaging quality of the optical lens, and meanwhile, the structural characteristics of lightness, thinness and miniaturization gradually become the development trend of the optical lens. In the related art, under the condition of meeting the design trend of light, thin and small optical lenses, the imaging quality of the optical lenses is still not clear enough, and the requirement of people on high-definition imaging of the optical lenses is difficult to meet.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can improve the light incoming amount and the imaging definition of the optical lens while realizing the miniaturization design of the optical lens.

In order to achieve the above object, a first aspect of the present invention discloses an optical lens including, in order from an object side to an image side along an optical axis, 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 element with positive refractive power has a convex object-side surface at a paraxial region, and a concave image-side surface at a paraxial region;

the second lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

the third lens element with positive refractive power has a convex object-side surface at a paraxial region thereof, and a concave image-side surface at a paraxial region thereof;

the fourth lens element with refractive power;

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

the sixth lens element with 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 seventh 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 eighth lens element with negative refractive power has a concave 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:

2.1<Fno/tan(HFOV)<2.5；

wherein Fno is an f-number of the optical lens, and HFOV is a half of a maximum field angle of the optical lens.

The optical lens provided by the application comprises a first lens with positive refractive power and a second lens with negative refractive power, and is favorable for correcting the on-axis spherical aberration of the optical lens, the object side surfaces of the first lens and the second lens are both convex surfaces at the paraxial region, and the image side surfaces of the first lens and the second lens are both concave surfaces at the paraxial region, so that the optical lens is favorable for converging light rays with larger angles, the optical performance of the optical lens is improved, and the reasonable surface type can reduce the thicknesses of the first lens and the second lens on the optical axis, thereby reducing the optical total length of the optical lens and realizing the miniaturization design of the optical lens; the third lens element with positive refractive power has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region, which is favorable for reducing the total optical length of the optical lens assembly; the fourth lens element, the fifth lens element and the sixth lens element with refractive power are favorable for correcting astigmatism of the optical lens assembly, and the sixth lens element has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, thereby being favorable for shortening the total length of the optical lens assembly; the seventh lens element with negative refractive power and the eighth lens element with negative refractive power are favorable for correcting curvature of field of the optical lens assembly, and the image side surfaces of the seventh lens element and the eighth lens element are both concave at paraxial region, which is favorable for correcting astigmatism and curvature of field of the optical lens assembly.

In addition, the optical lens provided by the application selects a proper number of lenses and reasonably configures the refractive power and the surface shape of each lens, so that the optical lens meets the following relational expression: 2.1< Fno/tan (hfov) <2.5, which ensures that the optical lens has the characteristic of large aperture and has larger light-entering amount, thereby enabling the shot image to be clearer and realizing high-quality shooting of object space scenes with low brightness, such as night scenes, starry sky scenes and the like.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 6.5mm < f tan (hfov) <7.10 mm; wherein f is an effective focal length of the optical lens. When the relational expression is satisfied, the optical lens has the characteristic of a large image plane, so that the optical lens has the characteristics of high pixels and high definition, the resolution of the optical lens is improved, and the optical lens has a better imaging effect.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 10mm < TTL/tan (hfov) <11 mm; 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. When the above relation is satisfied, it is advantageous to compress the total length of the optical lens (i.e. the distance between the object-side surface of the first lens element and the image plane of the optical lens on the optical axis), and at the same time, to prevent the field angle of the optical lens from being too large, so that the optical lens can be designed in a miniaturized manner and balance between the reduction of aberration in a large viewing area. When the total length of the optical lens is less than the lower limit of the relational expression, the problem of increasing the sensitivity of the optical lens is caused, and the aberration correction is difficult; or the field angle of the optical lens is too large, the distortion of the external field is too large, the distortion phenomenon occurs on the periphery of the image, and the imaging performance of the optical lens is reduced. When the total length of the optical lens is longer than the upper limit of the above relational expression, the optical lens is not easy to be miniaturized, and the light of the edge field is difficult to be imaged on the effective imaging area of the imaging surface, which easily causes incomplete imaging information, or the field angle of the optical lens is too small to satisfy the large field characteristic of the optical lens, which causes incomplete imaging information of the optical lens and affects the shooting quality of the optical lens.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.0< | f2/f | <1.9, and/or, 1.3< | f8/(f1+ f2) | < 2.5; wherein f is an effective focal length of the optical lens, f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, and f8 is an effective focal length of the eighth lens.

When the above relation 1.0< | f2/f | <1.9 is satisfied, that is, the ratio of the effective focal length of the second lens to the effective focal length of the optical lens is controlled within a certain range, which can prevent the optical power of the second lens from being too strong, so as to correct the high-level spherical aberration of the optical lens, and make the optical lens have good imaging quality.

When the above relational expression 1.3< | f8/(f1+ f2) | <2.5 is satisfied, the spherical aberration contribution degrees of the first lens, the second lens and the eighth lens in the optical lens can be reasonably distributed, so that the on-axis area of the optical lens has good imaging quality.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.0< CT5/ET5< 1.7; CT5 is the thickness of the fifth lens element along the optical axis, i.e., the center thickness of the fifth lens element, and ET5 is the distance from the maximum semi-effective aperture of the object-side surface of the fifth lens element to the maximum effective semi-aperture of the image-side surface of the fifth lens element along the optical axis, i.e., the edge thickness of the fifth lens element. By controlling the ratio of the edge thickness of the fifth lens to the center thickness of the fifth lens within a certain range, the high-grade aberration generated by the optical lens can be effectively balanced, the field curvature adjustment in engineering manufacturing is facilitated, and the imaging quality of the optical lens is improved.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.0< MAX11/MIN11< 1.5; wherein, MAX11 is the maximum distance of the image side optical effective zone of the fifth lens to the object side optical effective zone of the sixth lens in the optical axis direction, MIN11 is the minimum distance of the image side optical effective zone of the fifth lens to the object side optical effective zone of the sixth lens in the optical axis direction. When the relational expression is satisfied, the fifth lens can be prevented from being excessively bent, so that the local astigmatism can be effectively reduced, the overall sensitivity of the optical lens can be reduced, and the optical lens is favorable for engineering manufacture.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 3.5< L3/(W3+ V3) <4.5, and/or, 4.5< L7/(W7+ V7) < 6.5; wherein L3 is a maximum effective half aperture of an image-side surface of the third lens element, L7 is a maximum effective half aperture of an image-side surface of the seventh lens element, W3 is a maximum thickness of an object-side surface optical effective area of the third lens element to an image-side surface optical effective area of the third lens element in an optical axis direction, V3 is a minimum thickness of an object-side surface optical effective area of the third lens element to an image-side surface optical effective area of the third lens element in the optical axis direction, W7 is a maximum thickness of an object-side surface optical effective area of the seventh lens element to an image-side surface optical effective area of the seventh lens element in the optical axis direction, and V7 is a minimum thickness of the object-side surface optical effective area of the seventh lens element to an image-side surface optical effective area of the seventh lens element in the optical axis direction.

When the relation 3.5< L3/(W3+ V3) <4.5 is satisfied, the curvature of the third lens can be reasonably controlled, so that the aberration of the optical lens can be effectively balanced, the sensitivity of the optical lens can be reduced, and the performance of the optical lens can be improved. When the value is lower than the lower limit of the relation, the sensitivity of the optical lens is increased, which is not favorable for engineering manufacture, and when the value is higher than the upper limit of the relation, the field curvature aberration of the optical lens is difficult to correct, which easily results in poor performance of the optical lens.

When the relation 4.5< L7/(W7+ V7) <6.5 is satisfied, the curvature of the seventh lens can be reasonably controlled, so that the aberration of the optical lens can be effectively balanced, the sensitivity of the optical lens can be reduced, and the performance of the optical lens can be improved. When the value is lower than the lower limit of the relation, the sensitivity of the optical lens is increased, which is not favorable for engineering manufacture, and when the value is higher than the upper limit of the relation, the field curvature aberration of the optical lens is difficult to correct, which easily results in poor performance of the optical lens.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0< (| R9| - | R10|)/(| R9| + | R10|) <0.65, and/or, 0.5< R13/R14< 3; wherein R9 is a radius of curvature of an object-side surface of the fourth lens element along an optical axis, R10 is a radius of curvature of an image-side surface of the fourth lens element along the optical axis, R13 is a radius of curvature of an object-side surface of the sixth lens element along the optical axis, and R14 is a radius of curvature of an image-side surface of the sixth lens element along the optical axis.

When the relation 0< (| R9| - | R10|)/(| R9| + | R10|) <0.65 is satisfied, the thickness ratio trend of the fourth lens can be effectively controlled, the manufacturing sensitivity can be favorably reduced, the high-level coma aberration of the optical lens can be balanced, and the imaging quality of the optical lens is improved.

When the relational expression 0.5< R13/R14<3 is satisfied, the thickness ratio trend of the sixth lens can be effectively controlled, the manufacturing sensitivity can be favorably reduced, the high-level coma aberration of the optical lens can be balanced, and the imaging quality of the optical lens can be improved.

In a second aspect, the present invention discloses a camera module, which includes a photosensitive chip and the optical lens according to the first aspect, where the photosensitive chip is disposed on an image side of the optical lens. The camera module with the optical lens can realize the miniaturization design of the optical lens and improve the light inlet quantity and the imaging definition of the optical lens.

In a third aspect, the invention discloses an electronic device, which includes a housing and the camera module set of the second aspect, wherein the camera module set is disposed on the housing. The electronic equipment with the camera module can improve the light inlet quantity and the imaging definition of the optical lens while realizing the miniaturization design of the optical lens.

Compared with the prior art, the invention has the beneficial effects that: according to the optical lens, the camera module and the electronic device provided by the embodiment of the invention, the optical lens adopts eight lenses, and the optical lens meets the following relational expression while the refractive power and the surface shape of each lens are designed: 2.1< Fno/tan (hfov) <2.5, can shorten the total length of the optical lens, correct aberrations such as astigmatism and curvature of field of the optical lens, make the optical lens have the characteristic of large aperture, guarantee the optical lens has greater light inlet amount, thus make the picture that the optical lens shoots more clear, make the optical lens have better imaging effect, can realize the shooting high quality of object space scenes such as night scene, starry sky, etc. that the luminance is little.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an optical lens disclosed in a first embodiment of the present application;

fig. 2 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 3 is a schematic structural diagram of an optical lens disclosed in the second embodiment of the present application;

fig. 4 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 6 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 7 is a schematic structural diagram of an optical lens disclosed in a fourth embodiment of the present application;

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

fig. 9 is a schematic structural diagram of an optical lens disclosed in a fifth embodiment of the present application;

fig. 10 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 11 is a schematic structural diagram of an optical lens disclosed in a sixth embodiment of the present application;

fig. 12 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 13 is a schematic structural diagram 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 Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.

The technical solution of the present invention will be further described with reference to the following embodiments and the accompanying drawings.

Referring to fig. 1, according to a first aspect of the present application, an optical lens 100 is disclosed, where the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8, which are disposed in order from an object side to an image side along an optical axis O. During imaging, light rays enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 in sequence from the object side of the first lens L1, and finally form an image on the image forming surface 101 of the optical lens 100. The first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5 and the sixth lens element L6 have positive refractive power, the seventh lens element L7 has negative refractive power, and the eighth lens element L8 has negative refractive power.

Further, the object-side surface S1 of the first lens element L1 may be convex at the paraxial region O, the image-side surface S2 of the first lens element L1 may be concave at the paraxial region O, the object-side surface S3 of the second lens element L2 may be convex at the paraxial region O, the image-side surface S4 of the second lens element L2 may be concave at the paraxial region O, the object-side surface S5 of the third lens element L3 may be convex at the paraxial region O, the image-side surface S6 of the third lens element L3 may be concave at the paraxial region O, the object-side surface S7 of the fourth lens element L4 may be convex or concave at the paraxial region O, the image-side surface S8 of the fourth lens element L4 may be convex or concave at the paraxial region O, the object-side surface S9358 of the fifth lens element L5 may be convex or concave at the paraxial region O, the image-side surface S8 of the fifth lens element L5 may be convex or convex at the sixth lens element S3842 at the paraxial region O, the object-side surface S466 may be convex at the paraxial region O, the object-side surface S13 of the seventh lens element L7 is convex at the paraxial region O, the image-side surface S14 of the seventh lens element L7 is concave at the paraxial region O, the object-side surface S15 of the eighth lens element L8 is concave at the paraxial region O, and the image-side surface S16 of the eighth lens element L8 is concave at the paraxial region O.

As can be seen from the above, the optical lens 100 provided by the present application includes the combination of the first lens element L1 with positive refractive power and the second lens element L2 with negative refractive power, which is favorable for correcting the on-axis spherical aberration of the optical lens 100, the object-side surfaces of the first lens element L1 and the second lens element L2 are both convex surfaces at the paraxial region O, and the image-side surfaces are both concave surfaces at the paraxial region O, which is not only favorable for the optical lens 100 to converge light rays with a larger angle and improve the optical performance of the optical lens 100, but also can reduce the thicknesses of the first lens element L1 and the second lens element L2 on the paraxial region O due to the reasonable surface shape, thereby reducing the total optical length of the optical lens 100 and realizing the miniaturized design of the optical lens 100; the third lens element L3 with positive refractive power has a convex object-side surface S5 at paraxial region and a concave image-side surface S6 at paraxial region, which is favorable for reducing the total optical length of the optical lens system; the fourth lens element L4, the fifth lens element L5, and the sixth lens element L6 with refractive power are favorable for correcting astigmatism of the optical lens element 100, and the object-side surface S11 of the sixth lens element L6 is convex at the paraxial region O and the image-side surface S12 is concave at the paraxial region O, so as to be favorable for shortening the total length of the optical lens element 100; the seventh lens element L7 with negative refractive power and the eighth lens element L8 with negative refractive power are favorable for correcting curvature of field of the optical lens element 100, and the image side surfaces of the seventh lens element L7 and the eighth lens element L8 are both concave at the paraxial region O, which is favorable for correcting astigmatism and curvature of field of the optical lens element 100.

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

In some embodiments, at least one lens of the optical lens 100 may be made of glass, and the lens made of glass can endure higher or lower temperature and has excellent optical effect and better stability. In some embodiments, at least two lenses made of different materials may be further disposed in the optical lens 100, for example, a combination of a glass lens and a plastic lens may be adopted, but the specific configuration relationship may be determined according to practical requirements, which is not exhaustive here.

In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 may be an aperture stop or a field stop, which may be disposed between the object side of the optical lens 100 and the object side S1 of the first lens L1. It is understood that, in other embodiments, the stop 102 may also be disposed between two adjacent lenses, for example, between the second lens L2 and the third lens L3, and the arrangement is adjusted according to the actual situation, which is not specifically limited in this embodiment.

In some embodiments, the optical lens 100 further includes a filter L9, such as an infrared filter, disposed between the image-side surface S16 of the eighth lens L8 and the image plane 101 of the optical lens 100, so as to filter out light in other bands, such as visible light, and only allow infrared light to pass through, and therefore, the optical lens 100 can be used as an infrared optical lens, that is, the optical lens 100 can also image in a dark environment and other special application scenes and can obtain a better image effect.

In some embodiments, the optical lens 100 satisfies the following relationship: 2.1< Fno/tan (HFOV) <2.5, where Fno is the f-number of the optical lens 100 and HFOV is half of the maximum field angle of the optical lens 100. When the above relational expression is satisfied, the optical lens 100 can have a characteristic of a large aperture and a larger light-entering amount, so that a shot image can be clearer, and high-quality shooting of object space scenes with low brightness, such as night scenes and starry sky, can be realized.

In some embodiments, the optical lens 100 satisfies the following relationship: 6.5mm < f tan (hfov) <7.10mm, where f is the effective focal length of the optical lens 100. When the above relation is satisfied, the optical lens 100 has a characteristic of a large image plane, so that the optical lens 100 has characteristics of high pixel and high definition, the resolution of the optical lens 100 is improved, and the optical lens 100 has a better imaging effect.

In some embodiments, the optical lens 100 satisfies the following relationship: 10mm < TTL/tan (hfov) <11mm, where TTL is a distance on the optical axis O from the object-side surface S1 of the first lens L1 to the image plane of the optical lens 100. When the above relational expression is satisfied, it is advantageous to compress the total length of the optical lens 100 (i.e., the distance between the object-side surface S1 of the first lens element L1 and the image plane of the optical lens 100 on the optical axis O), and to prevent the angle of view of the optical lens 100 from becoming too large, so that the optical lens 100 can be designed in a compact size and reduce aberrations in a large viewing area in a balanced manner. When the total length of the optical lens 100 is too short, the sensitivity of the optical lens 100 is increased, and the aberration correction is difficult; or the field angle of the optical lens 100 is too large, which causes too large distortion of the external field of view, resulting in distortion at the periphery of the image and reducing the imaging performance of the optical lens 100. If the total length of the optical lens 100 is longer than the upper limit of the above relational expression, it is not favorable for implementing the miniaturization design of the optical lens 100, and the light of the peripheral field of view is difficult to image on the effective imaging area of the imaging plane, which easily causes the imaging information to be incomplete, or the field angle of the optical lens 100 is too small, which hardly satisfies the large field of view characteristic of the optical lens 100, which causes the imaging information of the optical lens 100 to be incomplete, which affects the shooting quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.0< | f2/f | <1.9, where f is the effective focal length of the optical lens 100, and f2 is the effective focal length of the second lens L2. When the above relation is satisfied, that is, the ratio of the effective focal length of the second lens L2 to the effective focal length of the optical lens 100 is controlled within a certain range, which can prevent the optical power of the second lens L2 from being too strong, so that the high-level spherical aberration of the optical lens 100 can be corrected, and the optical lens 100 has good imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.3< | f8/(f1+ f2) | <2.5, wherein f1 is the effective focal length of the first lens L1, f2 is the effective focal length of the second lens L2, and f8 is the effective focal length of the eighth lens L8. When the above-described relational expressions are satisfied, the spherical aberration contribution degrees of the first lens L1, the second lens L2, and the eighth lens L8 in the optical lens 100 can be reasonably distributed, so that the on-axis region of the optical lens 100 has good imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.0< CT5/ET5<1.7, where CT5 is the thickness of the fifth lens element L5 on the optical axis O, i.e., the center thickness of the fifth lens element L5, and ET5 is the distance from the maximum semi-effective aperture of the object-side surface S9 of the fifth lens element L5 to the maximum effective semi-aperture of the image-side surface S10 of the fifth lens element L5 in the direction of the optical axis O, i.e., the edge thickness of the fifth lens element L5. By controlling the ratio between the edge thickness of the fifth lens L5 and the center thickness of the fifth lens L5 within a certain range, the high-order aberration generated by the optical lens 100 can be effectively balanced, and the field curvature adjustment in the engineering manufacturing is facilitated, so that the imaging quality of the optical lens 100 is improved.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.0< MAX11/MIN11<1.5, where MAX11 is a maximum distance from an optical effective area of an image side surface S10 of the fifth lens L5 to an optical effective area of an object side surface S11 of the sixth lens L6 in the direction of the optical axis O, and MIN11 is a minimum distance from an optical effective area of an image side surface S10 of the fifth lens L5 to an optical effective area of an object side surface S11 of the sixth lens L6 in the direction of the optical axis O. When the above relation is satisfied, the fifth lens element L5 can be prevented from being bent too much, so that the local astigmatism can be effectively reduced, the overall sensitivity of the optical lens 100 can be reduced, and the engineering manufacturing is facilitated.

In some embodiments, the optical lens 100 satisfies the following relationship: 3.5< L3/(W3+ V3) <4.5, where L3 is the maximum effective half-aperture of the image-side surface S6 of the third lens L3, W3 is the maximum thickness of the optical effective area from the object-side surface S5 of the third lens L3 to the image-side surface S6 of the third lens L3 in the direction of the optical axis O, and V3 is the minimum thickness of the optical effective area from the object-side surface S5 of the third lens L3 to the image-side surface S6 of the third lens L3 in the direction of the optical axis O. When the above relation is satisfied, the curvature of the third lens L3 can be reasonably controlled, so that the aberration of the optical lens 100 can be effectively balanced, the sensitivity of the optical lens 100 is reduced, and the performance of the optical lens 100 is improved. If the value is lower than the lower limit of the above relation, the sensitivity of the optical lens 100 is increased, which is not favorable for the engineering manufacture, and if the value is higher than the upper limit of the above relation, the curvature of field aberration of the optical lens 100 is difficult to correct, which is likely to result in poor performance of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 4.5< L7/(W7+ V7) <6.5, where L7 is the maximum effective half aperture of the image-side surface S14 of the seventh lens L7, W7 is the maximum thickness of the optical effective area of the object-side surface S13 of the seventh lens L7 to the optical effective area of the image-side surface S14 of the seventh lens L7 in the direction of the optical axis O, and V7 is the minimum thickness of the optical effective area of the object-side surface S13 of the seventh lens L7 to the optical effective area of the image-side surface S14 of the seventh lens L7 in the direction of the optical axis O. When the above relation is satisfied, the curvature of the seventh lens L7 can be reasonably controlled, so that the aberration of the optical lens 100 can be effectively balanced, the sensitivity of the optical lens 100 is reduced, and the performance of the optical lens 100 is improved. When the value is lower than the lower limit of the above relation, the sensitivity of the optical lens 100 is increased, which is not favorable for the engineering manufacture, and when the value is higher than the upper limit of the above relation, the field curvature aberration of the optical lens 100 is difficult to correct, which easily results in poor performance of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0< (| R9| - | R10|)/(| R9| + | R10|) <0.65, wherein R9 is the radius of curvature of the object-side surface S7 of the fourth lens L4 at the optical axis O, and R10 is the radius of curvature of the image-side surface S8 of the fourth lens L4 at the optical axis O. When the above relational expression is satisfied, the trend of the thickness ratio of the fourth lens L4 can be effectively controlled, which is beneficial to reducing the manufacturing sensitivity, and the high-level coma aberration of the optical lens 100 can be balanced, thereby improving the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.5< R13/R14<3, wherein R13 is a radius of curvature of the object-side surface S11 of the sixth lens L6 at the optical axis O, and R14 is a radius of curvature of the image-side surface S12 of the sixth lens L6 at the optical axis O. When the above relational expression is satisfied, the tendency of the thickness ratio of the sixth lens L6 can be effectively controlled, which is beneficial to reducing the manufacturing sensitivity, and the high-level coma aberration of the optical lens 100 can be balanced, thereby improving the imaging quality of the optical lens 100.

The optical lens 100 of the present embodiment will be described in detail with reference to specific parameters.

First embodiment

A schematic structural diagram of an optical lens 100 disclosed in the first embodiment of the present application is shown in fig. 1, where the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an optical filter L9, which are disposed in order from an object side to an image side along an optical axis O. For 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, reference may be made to the above detailed description, and details are not repeated here.

Further, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has negative refractive power, the fifth lens element L5 has positive refractive power, the sixth lens element L6 has negative refractive power, the seventh lens element L7 has negative refractive power, and the eighth lens element L8 has negative refractive power.

Further, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are respectively convex and concave at the paraxial region O; the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex and concave, respectively, at the circumference. The object-side surface S3 and the image-side surface S4 of the second lens element L2 are respectively convex and concave at the paraxial region O; the object-side surface S3 and the image-side surface S4 of the second lens L2 are convex and concave, respectively, at the circumference. The object-side surface S5 and the image-side surface S6 of the third lens element L3 are respectively convex and concave at the paraxial region O; the object-side surface S5 and the image-side surface S6 of the third lens L3 are convex and concave, respectively, at the circumference. The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are respectively convex and concave at the paraxial region O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are concave and convex, respectively, at the circumference. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are convex at the paraxial region O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are concave and convex, respectively, at the circumference. The object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are respectively convex and concave at the paraxial region O; the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are concave and convex, respectively, at the circumference. The object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are respectively convex and concave at the paraxial region O, the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are respectively concave and convex at the circumference, the object-side surface S15 and the image-side surface S16 of the eighth lens element L8 are both concave at the paraxial region O, and the object-side surface S15 and the image-side surface S16 of the eighth lens element L8 are respectively concave and convex at the circumference.

Specifically, other parameters of the optical lens 100 are given in table 1 below, taking as an example that the effective focal length f of the optical lens 100 is 7.78mm, the maximum field angle FOV of the optical lens 100 is 84.60 °, the total optical length TTL of the optical lens 100 is 9.37mm, and the aperture size FNO is 2.00. The elements of the optical lens 100 from the object side to the image side along the optical axis O are arranged in the order of the elements from top to bottom in table 1. In the same lens, the surface with the smaller number of surfaces is the object side surface of the lens, and the surface with the larger number of surfaces is the image side surface of the lens, and as the numbers 2 and 3 correspond to the object side surface S1 and the image side surface S2 of the first lens L1, respectively. The Y radius in table 1 is the radius of curvature of the object-side or image-side surface of the respective surface number at the paraxial region 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 surface to the back surface of the lens on the optical axis O. The numerical value of the stop 102 in the "thickness" parameter column is the distance on the optical axis O from the stop 102 to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis O), the direction from the object side to the image side of the last lens of the first lens L1 is the positive direction of the optical axis O, when the value is negative, it indicates that the stop 102 is disposed on the image side of the vertex of the next surface, and if the thickness of the stop 102 is a positive value, the stop 102 is disposed on the object side of the vertex of the next surface. It is understood that the units of the radius Y, thickness, effective focal length in table 1 are all mm. And the reference wavelength of the effective focal length of each lens in table 1 is 555nm, and the reference wavelength of the refractive index and the abbe number of each lens is 587.56 nm.

TABLE 1

In the first embodiment, the object-side surface and the image-side surface of any one of the first lens L1 through the eighth lens L8 are aspheric, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, where c is 1/R (i.e., paraxial curvature c is the reciprocal of radius R of Y in table 1 above); k is a conic coefficient; ai is a correction coefficient corresponding to the high-order term of the ith aspheric term. Table 2 shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspherical lenses S1 to S16 in the first embodiment.

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows a longitudinal spherical aberration diagram of the optical lens 100 in the first embodiment at wavelengths of 650nm, 610nm, 555nm, 510nm, and 470 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 2 (B), fig. 2 (B) is a graph of astigmatism 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 focus offset and the ordinate along the Y-axis direction represents the image height in mm. In the astigmatism graph, T represents the curvature of the imaging plane 101 in the meridional direction, and S represents the curvature of the imaging plane 101 in the sagittal direction, and it can be seen from (B) in fig. 2 that astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 2 (C), fig. 2 (C) is a distortion curve diagram of the optical lens 100 in the first embodiment at a wavelength of 555 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height in mm. As can be seen from (C) in fig. 2, the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.

Second embodiment

Referring to fig. 3, fig. 3 is a schematic structural diagram of an optical lens 100 according to a second embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter L9, which are disposed in this order from the object side to the image side along the optical axis O. For 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, reference may be made to the above detailed description, and details are not repeated here.

Further, in the second embodiment, the refractive power of each lens element is different from that of each lens element in the first embodiment in that: the fourth lens element L4 with positive refractive power and the fifth lens element L5 with negative refractive power. Meanwhile, the surface shape of each lens is different from that of each lens in the first embodiment in that: the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave and convex, respectively, at the paraxial region O, and the object-side surface S9 of the fifth lens element L5 is concave at the paraxial region O.

The second embodiment exemplifies that the effective focal length f of the optical lens 100 is 7.85mm, the maximum field angle FOV of the optical lens 100 is 83.89 °, the total optical length TTL of the optical lens 100 is 9.33mm, and the aperture size FNO is 2.00. The other parameters in the second embodiment are given in table 3 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, the thickness, and the effective focal length in table 3 are mm. And the reference wavelength of the effective focal length of each lens in table 3 is 555nm, and the reference wavelength of the refractive index and abbe number of each lens is 587.56 nm.

TABLE 3

In the second embodiment, table 4 gives the high-order term coefficients that can be used for each aspherical lens in the second embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

TABLE 4

Referring to fig. 4, as can be seen from the longitudinal spherical aberration diagram (a), the astigmatism diagram (B) and the distortion diagram (C) in fig. 4, the longitudinal spherical aberration, the astigmatism and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 4 (a), fig. 4 (B), and fig. 4 (C), reference may be made to the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C), and details thereof are not repeated here.

Third embodiment

Referring to fig. 5, fig. 5 is a schematic structural diagram of an optical lens 100 according to a third embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter L9, which are disposed in this order from the object side to the image side along the optical axis O. For 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, reference may be made to the above detailed description, and details are not repeated here.

Further, in the third embodiment, the refractive power of each lens element is different from that of each lens element in the first embodiment in that: the fourth lens element L4 has positive refractive power. Meanwhile, in the third embodiment, the surface shape of each lens is different from that of each lens in the first embodiment in that: the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave and convex, respectively, at the paraxial region O, and the object-side surface S9 of the fifth lens element L5 is concave at the paraxial region O.

The third embodiment exemplifies that the effective focal length f of the optical lens 100 is 7.78mm, the maximum field angle FOV of the optical lens 100 is 84.49 °, the total optical length TTL of the optical lens 100 is 9.4mm, and the aperture size FNO is 1.97. The other parameters in the third embodiment are given in table 5 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, effective focal length in table 5 are all mm. And the reference wavelength of the effective focal length of each lens in table 5 is 555nm, and the reference wavelength of the refractive index and abbe number of each lens is 587.56 nm.

TABLE 5

In the third embodiment, table 6 gives the high-order term coefficients that can be used for each aspherical lens in the third embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

TABLE 6

Referring to fig. 6, as shown in the longitudinal spherical aberration diagram (a), the astigmatism diagram (B), and the distortion diagram (C) of fig. 6, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 6 (a), fig. 6 (B), and fig. 6 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Fourth embodiment

Referring to fig. 7, fig. 7 is a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter L9, which are disposed in this order from the object side to the image side along the optical axis O. For 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, reference may be made to the above detailed description, and details are not repeated here.

Further, in the fourth embodiment, the refractive power of each lens element differs from that of each lens element in the first embodiment in that: the fourth lens element L4 with positive refractive power, the fifth lens element L5 with negative refractive power and the sixth lens element L6 with positive refractive power. In the fourth embodiment, the surface shape of each lens differs from that of the first embodiment in that: the image-side surface S8 of the fourth lens element L4 is convex at the paraxial region O, and the object-side surface S9 of the fifth lens element L5 is concave at the paraxial region O.

The fourth embodiment exemplifies that the effective focal length f of the optical lens 100 is 7.85mm, the maximum field angle FOV of the optical lens 100 is 84.0 °, the total optical length TTL of the optical lens 100 is 9.44mm, and the aperture size FNO is 2.00. The other parameters in the fourth embodiment are given in table 7 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, effective focal length in table 7 are all mm. And the reference wavelength of the effective focal length of each lens in table 7 is 555nm, and the reference wavelengths of the refractive index and the abbe number of each lens are 587.56 nm.

TABLE 7

In the fourth embodiment, table 8 gives the high-order term coefficients that can be used for each aspherical lens in the fourth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

TABLE 8

Referring to fig. 8, as can be seen from the longitudinal spherical aberration diagram (a), the astigmatism diagram (B) and the distortion diagram (C) in fig. 8, the longitudinal spherical aberration, the astigmatism and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 8 (a), fig. 8 (B), and fig. 8 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Fifth embodiment

Referring to fig. 9, fig. 9 is a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter L9, which are disposed in this order from the object side to the image side along the optical axis O. For 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, reference may be made to the above detailed description, and details are not repeated here.

Further, in the fifth embodiment, the refractive power of each lens element differs from that of each lens element in the first embodiment in that: the sixth lens element L6 has positive refractive power. Meanwhile, the face shape of each lens coincides with that of each lens in the first embodiment.

The fifth embodiment exemplifies that the effective focal length f of the optical lens 100 is 7.83mm, the maximum field angle FOV of the optical lens 100 is 84.09 °, the total optical length TTL of the optical lens 100 is 9.37mm, and the aperture size FNO is 1.99. The other parameters in the fifth embodiment are given in table 9 below, and the definitions of the parameters can be obtained from the description of the previous embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, effective focal length in table 9 are all mm. In table 9, the reference wavelength of the effective focal length of each lens is 555nm, and the reference wavelengths of the refractive index and the abbe number of each lens are 587.56 nm.

TABLE 9

In the fifth embodiment, table 10 gives the high-order term coefficients that can be used for each aspherical lens in the fifth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Watch 10

Referring to fig. 10, as can be seen from the graph of (a) the longitudinal spherical aberration, (B) the astigmatism graph and (C) the distortion graph in fig. 10, the longitudinal spherical aberration, the astigmatism and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 10 (a), fig. 10 (B), and fig. 10 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Sixth embodiment

Referring to fig. 11, fig. 11 is a schematic structural diagram of an optical lens 100 according to a sixth embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a stop 102, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter L9, which are disposed in this order from the object side to the image side along the optical axis O. For 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, reference may be made to the above detailed description, and details are not repeated here.

Further, in the sixth embodiment, the refractive power of each lens element differs from that of each lens element in the first embodiment in that: the sixth lens element L6 has positive refractive power. Meanwhile, the face shape of each lens coincides with that of each lens in the first embodiment.

The sixth embodiment exemplifies that the effective focal length f of the optical lens 100 is 7.89mm, the maximum field angle FOV of the optical lens 100 is 83.66 °, the total optical length TTL of the optical lens 100 is 9.44mm, and the aperture size FNO is 1.96. The other parameters in the sixth embodiment are given in table 11 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, effective focal length in table 11 are mm. In table 11, the reference wavelength of the effective focal length of each lens is 555nm, and the reference wavelengths of the refractive index and abbe number of each lens are 587.56 nm.

TABLE 11

In the sixth embodiment, table 12 gives the high-order term coefficients that can be used for each aspherical lens in the sixth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

TABLE 12

Referring to fig. 12, as can be seen from the longitudinal spherical aberration diagram (a), the astigmatism diagram (B) and the distortion diagram (C) in fig. 12, the longitudinal spherical aberration, the astigmatism and the distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 12 (a), fig. 12 (B), and fig. 12 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.

Referring to table 13, table 13 summarizes ratios of the relations in the first embodiment to the sixth embodiment of the present application.

Watch 13

Referring to fig. 13, the present application further discloses a camera module, where the camera module 200 includes a photo sensor 201 and the optical lens 100, and the photo sensor 201 is disposed at an image side of the optical lens 100. The optical lens 100 may be configured to receive a light signal of a subject and project the light signal to the light sensing chip 201, and the light sensing chip 201 may be configured to convert the light signal corresponding to the subject into an image signal. It can be understood that the image pickup module 200 having the optical lens 100 described above can improve the light intake amount and the image sharpness of the optical lens 100 while realizing a miniaturized design of the optical lens 100.

Referring to fig. 14, the present application further discloses an electronic device, in which the electronic device 300 includes a housing 301 and the camera module 200, and the camera module 200 is disposed on the housing 301 to obtain image information. The electronic device 300 may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, and the like. It can be understood that the electronic device 300 having the camera module 200 also has all the technical effects of the optical lens 100. That is, the electronic apparatus 300 can improve the light intake amount and the image clarity of the optical lens 100 while realizing a compact design of the optical lens 100.

The optical lens, the camera module and the electronic device disclosed in the embodiments of the present invention are described in detail above, and the principle and the embodiments of the present invention are explained in detail herein by applying specific examples, and the description of the embodiments above is only used to help understanding the optical lens, the camera module and the electronic device and the core ideas thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. An optical lens barrel comprising, 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 fourth lens element with refractive power;

the optical lens satisfies the following relation:

2.1<Fno/tan(HFOV)<2.5；

2. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 6.5mm < f tan (hfov) <7.10 mm;

wherein f is the effective focal length of the optical lens.

3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following relation: 10mm < TTL/tan (hfov) <11 mm;

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.

4. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 1.0< | f2/f | <1.9 and/or, 1.3< | f8/(f1+ f2) | < 2.5;

wherein f is an effective focal length of the optical lens, f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, and f8 is an effective focal length of the eighth lens.

5. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 1.0< CT5/ET5< 1.7;

wherein CT5 is a thickness of the fifth lens element in an optical axis direction, and ET5 is a distance in the optical axis direction between a maximum effective semi-aperture of an object-side surface of the fifth lens element and a maximum effective semi-aperture of an image-side surface of the fifth lens element.

6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 1.0< MAX11/MIN11< 1.5;

wherein, MAX11 is the maximum distance in the optical axis direction from the image side optical effective area of the fifth lens to the object side optical effective area of the sixth lens, MIN11 is the minimum distance in the optical axis direction from the image side optical effective area of the fifth lens to the object side optical effective area of the sixth lens.

7. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 3.5< L3/(W3+ V3) <4.5, and/or, 4.5< L7/(W7+ V7) < 6.5;

wherein L3 is a maximum effective half aperture of an image-side surface of the third lens element, L7 is a maximum effective half aperture of an image-side surface of the seventh lens element, W3 is a maximum thickness of an object-side surface optical effective area of the third lens element to an image-side surface optical effective area of the third lens element in an optical axis direction, V3 is a minimum thickness of an object-side surface optical effective area of the third lens element to an image-side surface optical effective area of the third lens element in the optical axis direction, W7 is a maximum thickness of an object-side surface optical effective area of the seventh lens element to an image-side surface optical effective area of the seventh lens element in the optical axis direction, and V7 is a minimum thickness of the object-side surface optical effective area of the seventh lens element to an image-side surface optical effective area of the seventh lens element in the optical axis direction.

8. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0< (| R9| - | R10|)/(| R9| + | R10|) <0.65, and/or, 0.5< R13/R14< 3;

wherein R9 is a radius of curvature of an object-side surface of the fourth lens element at the optical axis, R10 is a radius of curvature of an image-side surface of the fourth lens element at the optical axis, R13 is a radius of curvature of an object-side surface of the sixth lens element at the optical axis, and R14 is a radius of curvature of an image-side surface of the sixth lens element at the optical axis.

9. A camera module, comprising a photo sensor chip and the optical lens of any one of claims 1-8, wherein the photo sensor 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.