CN113568142A

CN113568142A - Optical lens, camera module and electronic equipment

Info

Publication number: CN113568142A
Application number: CN202110811437.3A
Authority: CN
Inventors: 不公告发明人
Original assignee: Jiangxi Oumaisi Microelectronics Co Ltd
Current assignee: Jiangxi Oumaisi Microelectronics Co Ltd
Priority date: 2021-07-19
Filing date: 2021-07-19
Publication date: 2021-10-29
Anticipated expiration: 2041-07-19
Also published as: CN113568142B

Abstract

The invention discloses an optical lens, a camera module and electronic equipment. The first lens element with negative refractive power has a convex object-side surface and a concave image-side surface. The second lens element with positive refractive power has a convex object-side surface and a concave image-side surface. The third lens element with positive refractive power has a convex object-side surface and a convex image-side surface. The fourth lens element with negative refractive power has a concave object-side surface and a convex image-side surface. The fifth lens element with positive refractive power has a convex object-side surface at paraxial region. The optical lens satisfies the following relation: 45deg < HFOV/Fno <49deg, wherein HFOV is half of the maximum field angle of the optical lens, and Fno is the f-number of the optical lens, so that the optical lens has a large field angle and a large f-number, thereby enhancing the imaging effect of the optical lens in a dark environment.

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 image capturing technology, an optical lens with a wide-angle shooting function is more and more popular, and in the related art, the aperture of the optical lens with a larger angle of view is set to be smaller or the total length of the optical lens is increased, so that the distortion phenomenon is improved, and the imaging quality is improved. However, if a design with a small aperture is adopted to improve the distortion problem of imaging, the light entering amount of the optical lens in unit time is small, so that the imaging effect of the optical lens in a dark light environment is poor, and the shooting requirement of a customer in the dark light environment cannot be met; if the distortion problem of imaging is changed by increasing the total length of the optical lens, the requirement of miniaturization design of the optical lens cannot be met.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, wherein the optical lens has a larger visual angle and a larger aperture so as to meet the shooting requirement in a dark light environment, and in addition, the requirement on miniaturization design of the optical lens can be met.

In order to achieve the above object, according to a first aspect, embodiments of the present invention disclose an optical lens including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in order from an object side to an image side along an optical axis,

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

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

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

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

at least one surface of the first lens to the fifth lens is a non-rotational-symmetry surface type;

the optical lens satisfies the following relation: 45deg < HFOV/Fno <49 deg; wherein, the HFOV is a half of a maximum field angle of the optical lens, and the Fno is an f-number of the optical lens.

According to the optical lens of the first aspect of the application, the optical lens adopts the five-piece type lens, and the first lens with negative refractive power is beneficial to collecting incident light rays in a large range, so that the field range of the optical lens is enlarged; the second lens and the third lens with positive refractive power can well correct the huge aberration generated by the first lens towards the negative direction; meanwhile, the object side surface and the image side surface of the third lens are convex surfaces at the position of a lower beam axis, so that the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis (namely the total optical length of the optical lens) is shortened, the size of the optical lens is reduced, and the requirement of miniaturization design of the optical lens is met. The field angle of the optical lens can be further enlarged by the fourth lens element with negative refractive power and the object-side surface being concave at the paraxial region; the fifth lens with positive refractive power is beneficial to light convergence, and the exit angle of marginal light of the optical lens is reduced, so that the distortion and aberration of the optical lens are reduced. In addition, at least one surface of the first lens to the fifth lens is in a non-rotational symmetry plane type, so that the optical lens is beneficial to realizing final correction on the midday field curvature and the sagittal field curvature, and phase differences of the optical lens, such as field curvature, astigmatism, distortion and the like, can be effectively inhibited. Therefore, the above design of the refractive power and the surface shape of the first to fifth lenses is beneficial to increasing the field angle of the optical lens and improving the imaging distortion of the optical lens. In addition, the optical lens meets 45deg < HFOV/Fno <49deg, so that the optical lens has a large viewing angle and a large f-number, the light incoming amount in unit time can be increased, the imaging effect of the optical lens in a dark light environment is enhanced, and the optical lens can be suitable for shooting in dark light environments such as night scenes, rainy days, starry sky and the like, so as to meet the shooting requirements of customers on the dark light environment.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 4.0< TTL/EFL < 8; wherein, TTL is a distance from an object side surface of the first lens element to an image plane of the optical lens on the optical axis, and EFL is an effective focal length of the optical lens. The optical lens meets the condition that TTL/EFL is less than 8 and is 4.0, so that the optical lens not only has a larger field angle, but also has a shorter focal length, and the optical lens has a smaller optical total length, and is beneficial to the miniaturization design 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: 1.8< ImgH/EFL < 2.5; wherein ImgH is the radius of the maximum effective imaging circle of the optical lens, and EFL is the effective focal length of the optical lens. Because the optical lens meets the requirement that 1.8< ImgH/EFL <2.5, the optical lens has a larger field angle, and simultaneously has a smaller focal length and a larger radius of a maximum effective imaging circle, so that an electronic photosensitive chip with a larger size can be supported, further the optical lens realizes higher pixel imaging, light rays and image positions can be accurately captured and identified, 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: 0.2< CTAL/BL < 0.7; wherein CTAL is the sum of the thicknesses of the first lens to the fourth lens on the optical axis; BL is the distance between the object side surface of the first lens and the image side surface of the fifth lens on the optical axis. Because the optical lens meets 0.2< CTAL/BL <0.7, the thickness of each lens and the distance between the lenses of the optical lens are reasonably configured, which is beneficial to the molding and the assembly of the lenses, and the volume of the optical lens is smaller to meet the miniaturization design.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.1< AT4/AT3< 15; wherein AT4 is an air gap on the optical axis between the fourth lens and the fifth lens, and AT3 is an air gap on the optical axis between the third lens and the fourth lens. Because optical lens 0.1< AT4/AT3<15, through the air space of rational distribution third lens and fourth lens on the optical axis and the air space of fourth lens and fifth lens on the optical axis, be favorable to controlling the chief ray incident angle and can not too big, optimize the imaging quality of formation of image surface edge light, promote relative illuminance.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation:

wherein f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f4 is a focal length of the fourth lens, and EFL is an effective focal length of the optical lens. When the optical lens meets the relational expression, the diaphragm number of the optical lens, the effective focal lengths of the second lens and the fourth lens and the effective focal lengths of the first lens, the third lens and the optical lens can be reasonably configured, and the proper long focal lengths of the second lens and the fourth lens and the proper short focal lengths of the first lens and the third lens are utilized, so that the refractive power of each lens is reasonably distributed, and the field angle of the optical lens is favorably expanded; and simultaneously, the large aperture characteristic of the optical lens is favorably realized.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 35< Vd3+ Vd4< 120; and Vd3 is the Abbe number of the third lens at the wavelength of 940nm, and Vd4 is the Abbe number of the fourth lens at the wavelength of 940 nm. When the optical lens meets 35< Vd3+ Vd4<120, the materials of the third lens and the fourth lens can be reasonably configured, so that the chromatic aberration of the optical lens can be effectively corrected by the third lens and the fourth lens, 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< SD1/ImgH < 2.0; wherein SD1 is a half of the maximum effective aperture of the object-side surface of the first lens element, and ImgH is the radius of the maximum effective imaging circle of the optical lens. When the optical lens meets 1.0< SD1/ImgH <2.0, the aperture of the object side surface of the first lens and the size of the imaging surface of the optical lens can be reasonably configured, and the size of the light transmission aperture of the optical lens can be effectively controlled, so that the diameter of the optical lens is reduced, and the miniaturization design of the optical lens is realized.

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, wherein the photosensitive chip is disposed on an image side of the optical lens. The camera module with the optical lens also has all technical effects of the optical lens, namely, the camera module has a large f-number while having a large field angle, so that the light incoming amount in unit time can be increased, the imaging effect of the camera module in a dark light environment is enhanced, and the camera module can be suitable for shooting in dark light environments such as night scenes, rainy days, starry sky and the like so as to meet the shooting requirements of users on the dark light environments.

In a third aspect, the present invention discloses an electronic device, which includes a housing and the camera module set according to the second aspect, wherein the camera module set is disposed on the housing. The electronic equipment with the camera module also has all the technical effects of the optical lens. That is, the camera module of the electronic device has a large field angle and a large f-number, so that the light incident amount in unit time can be increased, the imaging effect of the camera module in a dark light environment is enhanced, and the camera module can be suitable for shooting in dark light environments such as night scenes, rainy days and starry sky, so as to meet the shooting requirement of a user on the dark light environment.

Compared with the prior art, the embodiment of the invention has the beneficial effects that:

by adopting the optical lens, the camera module and the electronic device provided by the embodiment, the optical lens adopts the five-piece lens, and the first lens with negative refractive power is beneficial to collecting large-range incident light rays and improving the field range of the optical lens; the second lens and the third lens with positive refractive power can well correct the huge aberration generated by the first lens towards the negative direction; the object side surface and the image side surface are both arranged to be convex surfaces near the optical axis, so that the optical total length of the optical lens is favorably shortened, the volume of the optical lens is reduced, and the requirement of miniaturization design of the optical lens is met; the field angle of the optical lens is further enlarged by a fourth lens element with negative refractive power and a concave object-side surface at a paraxial region; the fifth lens with positive refractive power is beneficial to light convergence, and the exit angle of marginal light of the optical lens is reduced, so that the distortion and aberration of the optical lens are reduced. In addition, at least one surface of the first lens to the fifth lens is in a non-rotational symmetry plane type, so that the optical lens is beneficial to realizing final correction on the midday field curvature and the sagittal field curvature, and phase differences of the optical lens, such as field curvature, astigmatism, distortion and the like, can be effectively inhibited. Therefore, the refractive power and the surface shape of the first lens element to the fifth lens element are favorable for increasing the angle of view of the optical lens and improving the distortion of the image. Further, since the optical lens satisfies the relation: 45deg < HFOV/Fno <49deg, thus make this optical lens have large visual angle, simultaneously still have great light ring, thereby can increase the light inlet quantity in the unit interval, in order to strengthen this optical lens and take images under the dim light environment, make this optical lens can be applicable to the dark light environment such as night scene, rainy day, starry sky and shoot, in order to satisfy the shooting demand of customer to the dim light environment.

Drawings

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

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

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

fig. 3 is a diagram showing a comparison between the paraxial angle of view and the actual angle of view of the true angle of view of the optical lens disclosed in the first embodiment of the present application;

fig. 4 is a schematic structural diagram of an optical lens disclosed in the second embodiment of the present application;

fig. 5 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 6 is a diagram showing a comparison between the paraxial angle of view and the actual angle of view of the true angle of view of the optical lens disclosed in the second embodiment of the present application;

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

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

fig. 9 is a diagram showing a comparison between the paraxial angle of view and the actual angle of view of the true angle of view of the optical lens disclosed in the third embodiment of the present application;

fig. 10 is a schematic structural diagram of an optical lens disclosed in the fourth embodiment of the present application;

fig. 11 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 12 is a diagram showing a comparison between a paraxial angle of view and a true angle of view actual angle of view of an optical lens disclosed in the fourth embodiment of the present application;

fig. 13 is a schematic structural diagram of an optical lens disclosed in a fifth embodiment of the present application;

fig. 14 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

fig. 15 is a diagram showing a comparison between the paraxial angle of view and the actual angle of view of the true angle of view of an optical lens disclosed in the fifth embodiment of the present application;

fig. 16 is a schematic structural diagram of the camera module disclosed in the present application;

fig. 17 is a schematic structural diagram of an electronic device disclosed in the present application.

Icon: 100. an optical lens; l1, first lens; l2, second lens; l3, third lens; l4, fourth lens; l5, fifth lens; l6, optical filters; 101. an imaging plane; 102. a diaphragm; s1, the object side surface of the first lens; s2, the image side surface of the first lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; s5, the object side surface of the third lens; s6, an image side surface of the third lens; s7, the object side surface of the fourth lens; s8, an image side surface of the fourth lens element; s9, the object side surface of the fifth lens; s10, an image side surface of the fifth lens element; λ 1, a first light beam; λ 2, the second light beam; λ 3, the third beam; o, the optical axis; 200. a camera module; 201. a photosensitive chip; 300. an electronic device; 301. a housing.

Detailed Description

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, fig. 1 is a schematic structural diagram of an optical lens 100 disclosed in the present application, and illustrates optical paths of a first light beam λ 1 and a second light beam λ 2. The present application discloses in a first aspect an optical lens 100, the optical lens 100 including, in order from an object side to an image side along an optical axis o, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. During imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 in sequence from the object side of the first lens L1, and is finally imaged on the imaging surface 101 of the optical lens 100.

Further, the first lens element L1 with negative refractive power has a convex object-side surface S1 of the first lens element L1 at the paraxial region o and a concave image-side surface S2 of the first lens element L1 at the paraxial region o. The second lens element L2 with positive refractive power has a convex object-side surface S3 at a paraxial region o of the second lens element L2 and a concave image-side surface S4 at the paraxial region o of the second lens element L2. The third lens element L3 with positive refractive power has a convex object-side surface S5 at the paraxial region o of the third lens element L3 and a convex image-side surface S6 at the paraxial region o of the third lens element L3. The fourth lens element L4 with negative refractive power has a concave object-side surface S7 at the paraxial region o of the fourth lens element L4 and a convex image-side surface S8 at the paraxial region o of the fourth lens element L4. The fifth lens element L5 with positive refractive power has a convex object-side surface S9 at a paraxial region o of the fifth lens element L5, and a concave or convex image-side surface S10 at the paraxial region o of the fifth lens element L5.

The optical lens 100 of the present application adopts a five-piece lens, and is provided with the first lens L1 with negative refractive power, which is beneficial to collecting incident light rays in a large range and improving the field range of the optical lens 100; the large aberration generated by the first lens element L1 in the negative direction can be corrected well by the second lens element L2 and the third lens element L3 with positive refractive power. By setting the object-side surface S1 and the image-side surface S2 of the third lens element L3 to be convex at the paraxial region o, the distance from the object-side surface S1 of the first lens element L1 to the image plane 101 of the optical lens 100 on the paraxial region o (i.e., the total optical length of the optical lens 100) can be shortened, and the volume of the optical lens 100 can be reduced, thereby meeting the requirement of the optical lens 100 for compact design. By disposing the fourth lens element L4 with negative refractive power and the object-side surface S7 being concave at the paraxial region o, the field angle of the optical lens system 100 can be further enlarged. The fifth lens element L5 with positive refractive power is favorable for converging light rays, and reduces the exit angle of marginal light rays of the optical lens 100, thereby reducing the distortion and aberration of the optical lens 100. Therefore, the above design of the refractive power and the surface shape of the first lens element L1 to the fifth lens element L5 is beneficial to increasing the field angle of the optical lens 100 and improving the imaging distortion of the optical lens.

In some embodiments, a surface of at least one of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 is a non-rotationally symmetric surface type. That is, the surface of at least one lens is aspheric, and by using a non-rotationally symmetric lens, the degree of freedom in designing the lens can be improved, which is beneficial to realize the final correction of the meridional field curvature and the sagittal field curvature of the optical lens 100, thereby effectively suppressing aberrations such as field curvature, astigmatism, distortion, and the like of the optical lens, and being beneficial to improving the imaging quality of the optical lens.

It can be understood that, when the optical lens 100 is applied to an apparatus such as a vehicle-mounted device, a driving recorder, or a camera of an automobile, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may be made of glass, so that the influence of temperature on each lens of the optical lens can be reduced, and the optical lens 100 can have good optical effect. When the optical lens 100 is applicable to electronic devices such as smart phones and smart tablets, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may be made of plastic, so that the optical lens has a good optical effect and good portability.

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 second lens L2 and the third lens L3. It is understood that, in other embodiments, the diaphragm 102 may also be disposed between two other adjacent lenses, for example, between the first lens L1 and the second lens L2, and the arrangement is adjusted according to the actual situation, which is not limited in this embodiment.

In some embodiments, the optical lens 100 further includes a filter L6, such as an infrared band pass filter, disposed between the image side S10 of the fifth lens element L5 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, so that the optical lens 100 can be used as an infrared optical lens, that is, the optical lens 100 can 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: 45deg < HFOV/Fno <49deg, wherein HFOV is half of the maximum field angle of the optical lens 100 and Fno is the f-number of the optical lens 100. When the angle is 45deg < HFOV/Fno <49deg, the optical lens 100 has a large viewing angle and a large f-number, so that the light incident amount per unit time can be increased to enhance the imaging effect of the optical lens 100 in a dim light environment, and the optical lens 100 can be suitable for shooting in dim light environments such as night scenes, rainy days, starry sky and the like to meet the shooting requirements of customers for the dim light environment. When the optical lens 100 meets the requirement that the HFOV/Fno is not greater than 45deg, the optical lens 100 cannot consider both a miniaturized design and a large aperture design, so that when the optical lens 100 meets the miniaturized design, the aperture needs to be designed to be smaller, resulting in a poor imaging effect of the optical lens 100 in a dark light environment; when the HFOV/Fno is equal to or larger than 49, the field angle of the optical lens 100 is too large, which is not favorable for collecting light rays by the optical lens 100, and thus the imaging effect is poor.

In some embodiments, the optical lens 100 satisfies the following relationship: 4.0< TTL/EFL <8, where TTL is a distance from the object-side surface S1 of the first lens element L1 to the image plane 101 of the optical lens 100 on the optical axis o, and EFL is an effective focal length of the optical lens 100. Because the optical lens 100 satisfies 4.0< TTL/EFL <8, the optical lens 100 not only has a larger field of view, but also has a shorter focal length of the optical lens 100, so that the optical lens 100 has a smaller total optical length, which is beneficial to the miniaturization design of the optical lens 100. When TTL/EFL is less than or equal to 4, the effective focal length of the optical lens 100 is too large to maintain the short focus state, and the field angle is too small to facilitate the wide angle of the optical lens 100. When TTL/EFL is greater than or equal to 8, the total optical length of the optical lens 100 is too long, which is not favorable for the miniaturization design of the optical lens 100, and the field angle is too large, which increases the sensitivity of the optical lens 100, and the distortion is too large, which is not favorable for the imaging of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.8< ImgH/EFL <2.5, where ImgH is the radius of the maximum effective imaging circle of the optical lens 100, i.e. the maximum image height of the optical lens 100, and may also be half of the diagonal of the photosensitive chip. Because the optical lens 100 satisfies that 1.8< ImgH/EFL <2.5, the optical lens 100 has a larger field angle, and the optical lens 100 also has a smaller focal length and a larger radius of a maximum effective imaging circle, so that an electronic photosensitive chip with a larger size can be supported, and further the optical lens 100 realizes higher pixel imaging, can accurately capture and identify light and image positions, and improves the imaging quality of the optical lens 100. When ImgH/EFL is less than or equal to 1.8, the radius of the maximum effective imaging circle of the optical lens 100 is too small to match with a photosensitive chip with high pixels, so that high-pixel imaging is difficult to realize; when ImgH/EFL is greater than or equal to 2.5, the focal length of the optical lens 100 is too small to meet the requirement of long-range shooting, and it is not favorable for light to better converge on the image plane 101, so that it is difficult to achieve a good shooting effect.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.2< CTAL/BL <0.7, wherein CTAL is a sum of thicknesses of the first lens L1 to the fourth lens L4 on the optical axis o, and BL is a distance between an object side surface S1 of the first lens L1 and an image side surface S10 of the fifth lens L5 on the optical axis o. Because the optical lens 100 satisfies 0.2< CTAL/BL <0.7, the thickness of each lens and the distance between the lenses of the optical lens 100 are reasonably configured, which is beneficial to the molding and assembly of the lenses, so that the volume of the optical lens 100 is smaller to satisfy the miniaturization design. When CTAL/BL is greater than 0.7, the thickness of each lens is too large, which results in a large volume of the optical lens and is not favorable for the miniaturization design of the optical lens 100, and when CTAL/BL is less than 0.2, the thickness of each lens is too small and is not favorable for the molding and assembly of the lens.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.1< AT4/AT3<15, wherein AT4 is an air gap on the optical axis o between the fourth lens L4 and the fifth lens L5, and AT3 is an air gap on the optical axis o between the third lens L3 and the fourth lens L4. Because optical lens 100 satisfies 0.1< AT4/AT3<15, the air space of third lens L3 and fourth lens L4 on optical axis o and the air space of fourth lens L4 and fifth lens L5 on optical axis o can be reasonably distributed, which is beneficial to controlling the incident angle of the chief ray not to be too large, optimizing the imaging quality of the marginal ray of the imaging surface and improving the relative illumination. When AT4/AT3 is equal to or greater than 15, the distance between the fourth lens element L4 and the fifth lens element L5 is too large, which results in too large incident angle of chief rays and poor imaging quality of light AT the edge of an imaging surface, and when AT4/AT3 is equal to or less than 0.1, the distance between the third lens element L3 and the fourth lens element L4 is too large, which is not favorable for miniaturization of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship:

wherein f1 is a focal length of the first lens L1, f2 is a focal length of the second lens L2, f3 is a focal length of the third lens L3, and f4 is a focal length of the fourth lens L4. When the optical lens 100 satisfies the relational expression, the f-number of the optical lens 100, the effective focal lengths of the second lens element L2 and the fourth lens element L4, and the effective focal lengths of the first lens element L1, the third lens element L3 and the optical lens 100 can be reasonably arranged, and the proper long focal length of the second lens element L2 and the proper short focal length of the fourth lens element L4, and the proper short focal length of the first lens element L1 and the proper short focal length of the third lens element L3 are utilized, so that the refractive power of each lens element can be reasonably distributed, which is beneficial to expanding the field angle of the optical lens 100; while facilitating the realization of a large aperture characteristic of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 35< Vd3+ Vd4<120, where Vd3 is the abbe number of the third lens L3 at 940nm wavelength, and Vd4 is the abbe number of the fourth lens L4 at 940nm wavelength. When the optical lens 100 satisfies 35< Vd3+ Vd4<120, the materials of the third lens L3 and the fourth lens L4 can be reasonably configured, so that the third lens L3 and the fourth lens L4 can effectively correct chromatic aberration of the optical lens 100, and the imaging quality of the optical lens 100 is improved. When Vd3+ Vd4 is more than or equal to 120 or Vd3+ Vd4 is less than or equal to 35, the third lens L3 and the fourth lens L4 are high in material cost and high in processing difficulty.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.0< SD1/ImgH <2.0, where SD1 is half the maximum effective aperture of the object-side surface S1 of the first lens L1, and ImgH is the radius of the maximum effective imaging circle of the optical lens 100. When the optical lens 100 satisfies 1.0< SD1/ImgH <2.0, the aperture of the object-side surface S1 of the first lens L1 and the size of the image plane 101 of the optical lens 100 can be reasonably configured, and the size of the clear aperture of the optical lens 100 can be effectively controlled, so that the diameter of the optical lens 100 is reduced, and the optical lens 100 can be designed in a miniaturized manner. When SD1/ImgH is greater than or equal to 2.0, the clear aperture of the optical lens 100 is too large, which results in a larger diameter of the optical lens 100 and is not favorable for the miniaturization design of the optical lens 100. When SD1/ImgH is less than or equal to 1.0, the clear aperture of the optical lens 100 is small, which is not favorable for maintaining good light input amount and affects the imaging effect of the optical lens 100.

First embodiment

Referring to fig. 1, 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, and a filter L6, which are disposed in order from an object side to an image side along an optical axis o. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5, reference may be made to the above-mentioned specific embodiments, and further description thereof is omitted here.

Further, the first lens element L1 has negative refractive power, the second lens element L2 has positive refractive power, the third lens element L3 has positive refractive power, the fourth lens element L4 has negative refractive power, and the fifth lens element L5 has positive refractive power.

Further, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex and concave, respectively, at the paraxial region o. The object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave, respectively, at the paraxial region o. The object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex at the paraxial region o. 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. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are convex and concave, respectively, at a paraxial region o.

Specifically, other parameters of the optical lens 100 are given in table 1 below, taking as examples that the f-number Fno of the optical lens 100 is 1.4, the field angle FOV of the optical lens 100 is 133.86 °, the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 2.0mm, the effective focal length EFL of the optical lens 100 is 0.92mm, and the total optical length TTL of the optical lens 100 is 5.920 mm.

The elements of the optical lens 100 from the object side to the image side along the optical axis o are arranged in the order of the elements from top to bottom in table 1. In the same lens, the surface with the smaller surface number is the object side surface of the lens, and the surface with the larger surface number is the image side surface of the lens, and for example, the

surface numbers

1 and 2 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 set of a lens is the thickness of the lens on the optical axis o, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis o. The numerical value of the stop 102 in the "thickness" parameter column is the distance 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) on the optical axis o, the direction from the object side of the first lens L1 to the image side of the last lens is the positive direction of the optical axis o, when the value is negative, it indicates that the stop 102 is disposed on the right side of the vertex of the next surface, and if the thickness of the stop 102 is positive, the stop 102 is disposed on the left side of the vertex of the next surface. It is understood that the units of the radius Y, thickness, and focal length in table 1 are all mm. And the reference wavelength of focal length, refractive index, abbe number of each lens in table 1 is 940 nm.

TABLE 1

In the first embodiment, the object-side surface and the image-side surface of any one of the first lens L1, the second lens L2, the third lens L3 and the fifth lens L5 are aspheric, and the surface type x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

x is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of R along the direction of the optical axis o; c is the curvature at the optical axis o of the aspheric surface, c ═ 1/R (i.e., paraxial curvature c is the inverse of the radius of curvature R in table 1 above); k is a conic coefficient; ai is a correction coefficient of the aspherical i-th term.

Table 2 shows the high-order term coefficients a4, a6, A8, a10, a12, a14, and a16 that can be used for the respective aspherical mirrors in the first embodiment.

TABLE 2

In the first embodiment, the object side surface S7 and the image side surface S8 of the fourth lens L4 are both free-form surfaces, each of which is defined by a surface type z of a curved lens using, but not limited to, the following free-form surface formula:

where K is the conic coefficient (constant), c is the curvature of the free-form surface at the optical axis o, r is the distance between the point on the free-form surface and the optical axis o, x is the x-direction component of r, y is the y-direction component of r, A_iIs the free form surface coefficient; e_i(X, Y) is a monomial of X-axis coordinates and Y-axis coordinates.

Table 3 shows the cone coefficients of the free-form surfaces S8-S9 and the coefficients of the free-form surfaces Ai in both the X and Y directions in the first embodiment.

TABLE 3

Referring to fig. 2 (a), fig. 2 (a) shows a light spherical aberration curve of the optical lens 100 in the first embodiment at 930nm, 940nm and 950 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 light astigmatism diagram of the optical lens 100 in the first embodiment at wavelengths of 930nm, 940nm and 950 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves show the meridional image plane curvature and the sagittal image plane curvature, and it can be seen from (B) in fig. 2 that the astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 2 (C), fig. 2 (C) is a graph illustrating a distortion curve of the optical lens 100 in the first embodiment at a wavelength of 940 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 940 nm.

Referring to fig. 3, fig. 3 is a diagram illustrating a comparison between the paraxial field angle and the actual field angle of the optical lens 100 according to the first embodiment. As can be seen from fig. 3, only the angular portion is slightly retracted, and the optical distortion of other fields of view is close to a straight line and takes a shape similar to a rectangle, so that the distortion of the optical lens 100 is well corrected.

Second embodiment

Referring to fig. 4, fig. 4 is a schematic structural diagram of an optical lens 100 according to a second embodiment of the present application, and illustrates optical paths of a first light beam λ 1 and a second light beam λ 2. 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, and a filter L6, which are disposed in this order from the object side to the image side along the optical axis o. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5, reference may be made to the above-mentioned specific embodiments, and further description thereof is omitted here.

Further, in the second embodiment, the refractive power and the surface shape at the paraxial region o of each lens element are respectively the same as the refractive power and the surface shape at the paraxial region o of each lens element in the first embodiment.

In the second embodiment, the other parameters of the optical lens 100 are given in table 4 below, taking as examples that the f-number Fno of the optical lens 100 is 1.45, the field angle FOV of the optical lens 100 is 134.4 °, the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 2.0mm, the effective focal length EFL of the optical lens 100 is 1.01mm, and the total optical length TTL of the optical lens 100 is 5.869 mm. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 4 are mm. And the reference wavelength of focal length, refractive index, abbe number of each lens in table 4 is 940 nm.

TABLE 4

In the second embodiment, table 5 gives the high-order term coefficients that can be used for each aspherical mirror surface in the second embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

TABLE 5

In the second embodiment, both the object side surface S7 and the image side surface S8 of the fourth lens L4 are free-form surfaces, and table 6 gives coefficients usable for the respective free-form surfaces in the second embodiment, wherein the free-form surface formula can be defined by the formula given in the first embodiment.

TABLE 6

Referring to fig. 5 (a), fig. 5 (a) shows a light spherical aberration curve of the optical lens 100 in the second embodiment at 930nm, 940nm and 950 nm. In fig. 5 (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 (a) in fig. 5, the spherical aberration value of the optical lens 100 in the second embodiment is better, which illustrates that the imaging quality of the optical lens 100 in the present embodiment is better.

Referring to fig. 5 (B), fig. 5 (B) is a light astigmatism diagram of the optical lens 100100 in the second embodiment at wavelengths of 930nm, 940nm and 950 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves show the meridional image plane curvature and the sagittal image plane curvature, and it can be seen from (B) in fig. 5 that the astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 5 (C), fig. 5 (C) is a distortion curve diagram of the optical lens 100 in the second embodiment at a wavelength of 940 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. 5, the distortion of the optical lens 100 is well corrected at the wavelength 940 nm.

Referring to fig. 6, fig. 6 is a diagram illustrating a comparison between the paraxial field angle and the actual field angle of the optical lens 100 according to the second embodiment. As can be seen from fig. 6, only the angular portion is slightly retracted, and the optical distortion of other fields of view is close to a straight line and takes a rectangular-like shape, so that the distortion of the optical lens 100 is well corrected.

Third embodiment

Referring to fig. 7, fig. 7 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, and a filter L6, which are disposed in this order from the object side to the image side along the optical axis o. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5, reference may be made to the above-mentioned specific embodiments, and further description thereof is omitted here.

Further, in the third embodiment, the refractive power and the surface shape at the paraxial region o of each lens element are respectively the same as the refractive power and the surface shape at the paraxial region o of each lens element in the first embodiment.

In the third embodiment, the other parameters of the optical lens 100 are given in table 7 below, taking as examples that the f-number Fno of the optical lens 100 is 1.45, the field angle FOV of the optical lens 100 is 135.74 °, the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 2.1mm, the effective focal length EFL of the optical lens 100 is 0.994mm, and the total optical length TTL of the optical lens 100 is 5.230 mm. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 7 are mm. And the reference wavelength of focal length, refractive index, abbe number of each lens in table 7 is 940 nm.

TABLE 7

In the third embodiment, both the object side surface S1 and the image side surface S2 of the first lens L1 are free-form surfaces, and table 8 gives coefficients usable for the respective free-form surfaces in the third embodiment, wherein the free-form surface formula can be defined by the formula given in the first embodiment.

TABLE 8

In the third embodiment, the object-side surface and the image-side surface of any one of the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are aspheric, and table 9 gives 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 9

Referring to fig. 8 (a), fig. 8 (a) shows a light spherical aberration curve of the optical lens 100 in the third embodiment at 930nm, 940nm and 950 nm. In fig. 8 (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 (a) in fig. 8, the spherical aberration value of the optical lens 100 in the third embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 8 (B), fig. 8 (B) is a light astigmatism diagram of the optical lens 100 in the third embodiment at wavelengths of 930nm, 940nm and 950 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves show the meridional image plane curvature and the sagittal image plane curvature, and it can be seen from (B) in fig. 8 that astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 8 (C), fig. 8 (C) is a graph illustrating a distortion curve of the optical lens 100 at a wavelength of 940nm in the third embodiment. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height in mm. As can be seen from (C) in fig. 8, the distortion of the optical lens 100 is well corrected at the wavelength 940 nm.

Referring to fig. 9, fig. 9 is a diagram illustrating a comparison between the paraxial field angle and the actual field angle of the optical lens 100 according to the third embodiment. As can be seen from fig. 9, only the angular portion is slightly retracted, and the optical distortion of other fields of view is close to a straight line and takes a rectangular-like shape, so that the distortion of the optical lens 100 is well corrected.

Fourth embodiment

Referring to fig. 10, fig. 10 is a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present application, and illustrates optical paths of a first light beam λ 1, a second light beam λ 2, and a third light beam λ 3. 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, and a filter L6, which are disposed in this order from the object side to the image side along the optical axis o. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5, reference may be made to the above-mentioned specific embodiments, and further description thereof is omitted here.

Further, in the fourth embodiment, the refractive power of each lens element is the same as that of each lens element in the first embodiment, and the difference between the surface shape of each lens element at the paraxial region o and that of each lens element in the first embodiment is as follows: the object-side surface S9 of the fifth lens element L5 is convex at the paraxial region o.

In the fourth embodiment, the f-number Fno of the optical lens 100 is 1.45, the field angle FOV of the optical lens 100 is 132.94 °, the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 2.1mm, the effective focal length EFL of the optical lens 100 is 0.9mm, and the total optical length TTL of the optical lens 100 is 5.771mm, for example, and other parameters of the optical lens 100 are given in table 10 below. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 10 are mm. And the reference wavelength of focal length, refractive index, abbe number of each lens in table 10 is 940 nm.

Watch 10

In the fourth embodiment, the object-side surface S7 and the image-side surface S8 of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are aspheric, the object-side surface S9 of the fifth lens L5 is also aspheric, and table 11 shows high-order term coefficients that can be used for each aspheric mirror surface in the fourth embodiment, where each aspheric type can be defined by the formula given in the first embodiment.

TABLE 11

In the fourth embodiment, the image-side surface S10 of the fifth lens L5 is a free-form surface, and table 12 gives coefficients usable for the respective free-form surfaces in the fourth embodiment, wherein the free-form surface formula can be defined by the formula given in the first embodiment.

TABLE 12

Referring to fig. 11 (a), fig. 11 (a) shows a light spherical aberration curve of the optical lens 100 in the fourth embodiment at 930nm, 940nm and 950 nm. In fig. 11 (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 (a) in fig. 11, the spherical aberration value of the optical lens 100 in the fourth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 11 (B), fig. 11 (B) is a light astigmatism diagram of the optical lens 100 in the fourth embodiment at wavelengths of 930nm, 940nm and 950 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves show the meridional image plane curvature and the sagittal image plane curvature, and it can be seen from (B) in fig. 11 that astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 11 (C), fig. 11 (C) is a graph illustrating a distortion curve of the optical lens 100 in the fourth embodiment at a wavelength of 940 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. 11, the distortion of the optical lens 100 is well corrected at the wavelength 940 nm.

Referring to fig. 12, fig. 12 is a diagram illustrating a comparison between the paraxial field angle and the actual field angle of the optical lens 100 according to the fourth embodiment. As can be seen from fig. 12, only the angular portion is slightly retracted, and the optical distortion of other fields of view is close to a straight line and takes a rectangular-like shape, so that the distortion of the optical lens 100 is well corrected.

Fifth embodiment

Referring to fig. 13, fig. 13 is a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present application, and illustrates optical paths of a first light beam λ 1, a second light beam λ 2, and a third light beam λ 3. 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, and a filter L6, which are disposed in this order from the object side to the image side along the optical axis o. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5, reference may be made to the above-mentioned specific embodiments, and further description thereof is omitted here.

Further, in the fifth embodiment, the refractive power and the surface shape at the paraxial region o of each lens element are respectively the same as the refractive power and the surface shape at the paraxial region o of each lens element in the fourth embodiment.

In the fifth embodiment, the f-number Fno of the optical lens 100 is 1.4, the field angle FOV of the optical lens 100 is 135.6 °, the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 2.1mm, the effective focal length EFL of the optical lens 100 is 0.9165mm, and the total optical length TTL of the optical lens 100 is 6.0mm, for example, other parameters of the optical lens 100 are given in table 13 below. The definitions of the parameters can be obtained from the description of the foregoing embodiments, and are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 13 are mm. And the reference wavelength of focal length, refractive index, abbe number of each lens in table 13 is 940 nm.

Watch 13

In the fifth embodiment, the object-side surface S7 and the image-side surface S8 of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are aspheric, the object-side surface S9 of the fifth lens L5 is also aspheric, and table 14 gives coefficients of high-order terms that can be used for each aspheric mirror surface in the fifth embodiment, where each aspheric type can be defined by the formula given in the first embodiment.

TABLE 14

In the fifth embodiment, the image-side surface S10 of the fifth lens L5 is a free-form surface, and table 15 gives coefficients usable for the respective free-form surfaces in the fifth embodiment, wherein the free-form surface formula can be defined by the formula given in the first embodiment.

Watch 15

Referring to fig. 14 (a), fig. 14 (a) shows a light spherical aberration curve of the optical lens 100 in the fifth embodiment at 930nm, 940nm and 950 nm. In (a) in fig. 14, 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 (a) in fig. 14, the spherical aberration value of the optical lens 100 in the fifth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 14 (B), fig. 14 (B) is a light astigmatism diagram of the optical lens 100 in the fifth embodiment at wavelengths of 930nm, 940nm and 950 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves show the meridional image plane curvature and the sagittal image plane curvature, and it can be seen from (B) in fig. 14 that astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 14 (C), fig. 14 (C) is a graph illustrating a distortion curve of the optical lens 100 in the fifth embodiment at a wavelength of 940 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. 14, the distortion of the optical lens 100 is well corrected at the wavelength 940 nm.

Referring to fig. 15, fig. 15 is a diagram illustrating a comparison between the paraxial field angle and the actual field angle of the optical lens 100 according to the fifth embodiment. As can be seen from fig. 15, only the angular portion is slightly retracted, and the optical distortion of other fields of view is close to a straight line and takes a rectangular-like shape, so that the distortion of the optical lens 100 is well corrected.

Referring to table 16, table 16 summarizes ratios of the relations in the first embodiment to the fifth embodiment of the present application.

TABLE 16

Referring to fig. 16, the present application further discloses a camera module 200, where the camera module 200 includes a photo sensor chip 201 and the optical lens 100 according to any of the first to fifth embodiments, and the photo sensor chip 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. And will not be described in detail herein. It can be understood that the camera module 200 having the optical lens 100 also has all the technical effects of the optical lens 100, that is, the camera module 200 has a large field angle and a large f-number, so that the light incident amount in a unit time can be increased, the imaging effect of the camera module 200 in a dark light environment can be enhanced, and the camera module 200 can be suitable for shooting in dark light environments such as night scenes, rainy days, starry sky and the like, so as to meet the shooting requirements of users in the dark light environment. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

Referring to fig. 17, the present application further discloses an electronic device 300, where the electronic device 300 includes a housing 301 and the camera module 200 as described above, 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 camera module 200 of the electronic device 300 has a large field angle and a large f-number, so that the light incident amount in a unit time can be increased, the imaging effect of the camera module 200 in a dark light environment can be enhanced, and the camera module 200 can be suitable for shooting in dark light environments such as night scenes, rainy days, starry sky and the like, so as to meet the shooting requirement of a user on the dark light environment. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

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

Claims

1. An optical lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in this order from an object side to an image side along an optical axis;

the optical lens satisfies the following relation:

45deg<HFOV/Fno<49deg；

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

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

4.0<TTL/EFL<8；

wherein, TTL is a distance from an object side surface of the first lens element to an image plane of the optical lens on the optical axis, and EFL is an effective focal length of the optical lens.

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

1.8<ImgH/EFL<2.5；

wherein ImgH is the radius of the maximum effective imaging circle of the optical lens, and EFL is the effective focal length of the optical lens.

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

0.2<CTAL/BL<0.7；

wherein CTAL is the sum of the thicknesses of the first lens to the fourth lens on the optical axis; BL is the distance between the object side surface of the first lens and the image side surface of the fifth lens on the optical axis.

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

0.1<AT4/AT3<15；

wherein AT4 is an air gap on the optical axis between the fourth lens and the fifth lens, and AT3 is an air gap on the optical axis between the third lens and the fourth lens.

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

wherein f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f4 is a focal length of the fourth lens, and EFL is an effective focal length of the optical lens.

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

35<Vd3+Vd4<120；

and Vd3 is the Abbe number of the third lens at the wavelength of 940nm, and Vd4 is the Abbe number of the fourth lens at the wavelength of 940 nm.

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

1.0<SD1/ImgH<2.0；

wherein SD1 is a half of the maximum effective aperture of the object-side surface of the first lens element, and ImgH is the radius of the maximum effective imaging circle of the optical lens.

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.