CN114019655A

CN114019655A - Optical lens, camera module and electronic equipment

Info

Publication number: CN114019655A
Application number: CN202111346526.1A
Authority: CN
Inventors: 龙鑫灿; 李明; 刘秀; 曾晗
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2022-02-08
Anticipated expiration: 2041-11-15
Also published as: CN114019655B

Abstract

The invention discloses an optical lens, a camera module and electronic equipment, wherein the optical lens comprises a first lens with positive focal power, which is arranged in sequence from an object side to an image side along an optical axis, and the object side surface of the first lens is a convex surface; a second lens having a negative refractive power, an image-side surface of which is concave; a third lens having an optical power; a fourth lens having a focal power, the object-side surface of which is convex; the object side surface and the image side surface of the fifth lens with focal power are convex and concave. The optical lens further satisfies the relation: 1.1 < TTL/ImgH < 1.3. The optical lens, the camera module and the electronic equipment provided by the embodiment of the invention can meet the design requirements of miniaturization, large image plane and high imaging quality 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

With the pursuit of light, thin and small electronic products, the structural characteristics of light, thin and small optical lens combined with the shooting effect of large image plane and high imaging quality gradually become the development trend of the optical lens. In the related art, in order to achieve the purpose of large image plane and achieving higher imaging quality, the number of lenses is increased to correct the aberration of the optical lens, however, the increase of the number of lenses not only increases the difficulty of designing and processing, molding and assembling the optical lens, but also is not favorable for the design requirement of miniaturization of the optical lens.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can meet the requirements of miniaturization of the optical lens and design requirements of large image surface and high imaging quality of the optical lens.

In order to achieve the above object, in a first aspect, the present invention discloses 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 has a positive optical power, and the object side surface of the first lens is convex at a paraxial region;

the second lens has a negative optical power, and the image side surface of the second lens is concave at the paraxial region;

the third lens has optical power;

the fourth lens has a focal power, and the object side surface of the fourth lens is convex at a paraxial region;

the fifth lens element has a focal power, an object-side surface of the fifth lens element being convex at a paraxial region, and an image-side surface of the fifth lens element being concave at a paraxial region;

the optical lens satisfies the following relation: TTL/ImgH is more than 1.1 and less than 1.3;

wherein, TTL is a distance on the optical axis from the object-side surface of the first lens element to the imaging surface of the optical lens (i.e., a total length of the optical lens), and ImgH is a radius of a maximum effective imaging circle of the optical lens.

In the optical lens of this application, adopt the first lens that has positive focal power and the second lens that has negative focal power, and the object side of first lens is the convex surface in passing optical axis department, and the image side of second lens is the concave surface in passing optical axis department, through mutually supporting of first lens and second lens, not only is favorable to assembling the light of incidenting into optical lens, still is favorable to correcting optical lens at the epaxial spherical aberration of light to improve optical lens's image quality. The object side surface of the fourth lens is convex at the position near the optical axis, so that the total length of the optical lens can be shortened, aberration can be corrected, the emergent angle of light can be suppressed, and the miniaturization design of the optical lens and the imaging quality of the optical lens are facilitated. The object side surface of the fifth lens is a convex surface at the position of a low beam axis, the image side surface of the fifth lens is a concave surface at the position of the low beam axis, so that the aberration generated by the first lens to the fourth lens can be corrected, the aberration balance of the optical lens can be ensured, the imaging quality of the optical lens can be improved, the smooth transition of marginal field rays to an imaging surface from a smaller deflection angle can be facilitated, and the characteristic of a large image surface of the optical lens can be realized. Therefore, the optical lens meets the design requirements of miniaturization, large image plane and high imaging quality by reasonably configuring the focal power and the surface type of each lens. In addition, the ratio of the total length of the optical lens to the radius of the maximum effective imaging circle of the optical lens is limited, so that the total length and the image height of the optical lens are effectively controlled, and the characteristics of ultra-thinning and miniaturization of the optical lens are further facilitated.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 6.4< EFL FNO/T45< 7.7; and EFL is an effective focal length of the optical lens, FNO is an f-number of the optical lens, and T45 is a distance from an object side surface of the fourth lens to an image side surface of the fifth lens on the optical axis.

When the relational expression is satisfied, the optical lens can realize the miniaturization design and can also ensure enough light transmission quantity so as to satisfy the imaging requirements of the optical lens on high image quality and high definition. When EFL × FNO/T45 is less than or equal to 6.4, although sufficient light flux can be provided for the optical lens, the total length of the optical lens is increased, which does not meet the design requirement of miniaturization of the optical lens; when EFL × FNO/T45 is greater than or equal to 7.7, the light flux of the optical lens is insufficient, which results in low accuracy of capturing images by the optical lens and is not favorable for the design requirement of high resolution imaging quality of the optical lens.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 5.5< ALT/T1< 7; ALT is a sum of lens thicknesses of the first lens to the fifth lens on the optical axis, and T1 is a thickness of the first lens on the optical axis.

By adjusting the proportional relationship between the total lens thickness of the first lens, the fifth lens and the first lens on the optical axis, the total length of the optical lens can be effectively shortened and the imaging quality of the optical lens can be ensured. When the relation is satisfied, the design requirement of miniaturization of the optical lens can be realized while the imaging quality of the optical lens is ensured.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 3.5mm < EFL tan (HFOV) 4mm or less; wherein EFL is an effective focal length of the optical lens, and HFOV is half of a maximum field angle of the optical lens.

By controlling the ratio of the effective focal length of the optical lens to the tangent value of half of the maximum field angle of the optical lens within a certain range, the optical lens has good magnification, and the optical lens has good detail recognition capability during framing. When the relation is satisfied, the optical lens has good magnification, so that the optical lens has good detail recognition capability during framing.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 1.8< | f4/EFL | < 16; wherein EFL is an effective focal length of the optical lens, and f4 is a focal length of the fourth lens.

When the relational expression is satisfied, the contribution of the fourth lens to the total focal power of the optical lens is proper, which is beneficial to improving the aberration correction capability of the optical lens, and in addition, the fourth lens can be matched with other lenses to ensure that the optical lens has better aberration correction effect, thereby ensuring that the optical lens has good imaging quality. When the absolute value of f4/EFL is less than or equal to 1.8, the effective focal length of the optical lens is too large, a larger field angle cannot be obtained, and high-resolution imaging of the optical lens is not facilitated; when | f4/EFL | ≧ 16, the absolute value of the focal length of the fourth lens is too large, which makes insufficient contribution to the total focal power of the optical lens, and is not favorable for improving the aberration correction capability of the optical lens.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 1.5< f12/f1< 2; wherein f12 is a combined focal length of the first lens and the second lens, and f1 is a focal length of the first lens.

The ratio of the combined focal length of the first lens and the second lens to the focal length of the first lens is reasonably controlled, and the optical performance and the processing and manufacturing difficulty of the optical lens can be effectively balanced. When the above relational expression is satisfied, the optical lens has good optical properties and workability.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 0.8< | (R2+ R3)/(R2-R3) | < 1.4; wherein R2 is a radius of curvature of an object-side surface of the first lens at the optical axis, and R3 is a radius of curvature of an image-side surface of the first lens at the optical axis.

When the relational expression is satisfied, the trend of the thickness ratio of the object side surface and the image side surface of the first lens can be well controlled, and the shape of the first lens is further limited, so that the spherical aberration contribution of the first lens is favorably controlled within a reasonable range, the imaging quality of a visual field on an optical axis and a visual field outside the optical axis is not obviously degraded due to the change of the spherical aberration contribution, and the optical performance of the optical lens and the processability of each lens are favorably improved.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 1< SD41/SD42< 1.5; wherein SD41 is the maximum effective half aperture of the object-side surface of the fourth lens, and SD42 is the maximum effective half aperture of the image-side surface of the fourth lens.

When the relation is satisfied, the aperture of the object side surface of the fourth lens and the aperture of the imaging surface of the optical lens can be reasonably configured, and then the radial size of the fourth lens is reduced, so that the optical lens can realize small head design. When the optical lens is applied to the electronic equipment, the opening size of the optical lens on the screen of the electronic equipment can be reduced, and the screen occupation ratio of the electronic equipment is further improved. In addition, when the above relation is satisfied, the fourth lens has high workability, and is also advantageous in enlarging the aperture, maintaining the optical lens to have a good light transmission amount, and further, enabling the optical lens to have high imaging quality. When SD41/SD42 is less than or equal to 1, the deflection degree of incident light in the optical lens is too large, off-axis aberration is easily increased, and the imaging quality of the optical lens is reduced; when SD41/SD42 is 1.5 or more, the radial dimension of the fourth lens is too large, and it is difficult to realize a small head design of the optical lens.

As an optional implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 2< | (SAG6-SAG5)/SAG6| < 8; wherein SAG5 is the maximum sagittal height of the image side of the second lens and SAG6 is the maximum sagittal height of the object side of the third lens.

When the relational expression is satisfied, the shape of the image side surface of the second lens is similar to that of the object side surface of the third lens, so that peripheral light rays can be smoothly transited, and the reduction of the sensitivities of the second lens and the third lens is facilitated.

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 of the first aspect can meet the design requirements of miniaturization, large image plane and high imaging quality of the camera module.

In a third aspect, the 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 in the housing. The electronic equipment with the camera module can meet the design requirements of miniaturization, large image plane and high imaging quality of the electronic equipment.

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

the optical lens adopts the first lens with positive focal power and the second lens with negative focal power, the object side surface of the first lens is a convex surface at a paraxial region, the image side surface of the second lens is a concave surface at a paraxial region, and the first lens and the second lens are matched with each other, so that the light rays entering the optical lens can be converged, the spherical aberration of the optical lens on the optical axis can be corrected, and the imaging quality of the optical lens can be improved. The object side surface of the fourth lens is convex at the position near the optical axis, so that the total length of the optical lens can be shortened, aberration can be corrected, the emergent angle of light can be suppressed, and the miniaturization design of the optical lens and the imaging quality of the optical lens are facilitated. The object side surface of the fifth lens is a convex surface at the position of a low beam axis, the image side surface of the fifth lens is a concave surface at the position of the low beam axis, so that the aberration generated by the first lens to the fourth lens can be corrected, the aberration balance of the optical lens can be ensured, the imaging quality of the optical lens can be improved, the smooth transition of marginal field rays to an imaging surface from a smaller deflection angle can be facilitated, and the characteristic of a large image surface of the optical lens can be realized. In addition, the optical lens meets the relation that TTL/ImgH is more than 1.1 and less than 1.3, and the characteristics of ultra-thinning and miniaturization of the optical lens are favorably realized by controlling the total length and the image height of the optical lens. Therefore, the optical lens provided by the invention can meet the design requirements of miniaturization, large image plane and high imaging quality of the optical lens.

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 according to an embodiment of the present disclosure;

fig. 2 is a light 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 invention;

fig. 4 is a light 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 invention;

fig. 6 is a light 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 the fourth embodiment of the present invention;

fig. 8 is a light 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 the fifth embodiment of the present invention;

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

FIG. 11 is a schematic structural diagram of a camera module according to the present disclosure;

fig. 12 is a schematic structural diagram of an electronic device disclosed in the present invention.

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 invention, an optical lens 100 is disclosed, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5, which are disposed in order from an object side to an image side along an optical axis O. 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. The first lens L1 has positive focal power, the second lens L2 has negative focal power, and the third lens L3, the fourth lens L4 and the fifth lens L5 all have positive focal power or negative focal power.

Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is convex or concave at the paraxial region O; the object-side surface 21 of the second lens element L2 is convex or concave at the paraxial region O, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are both convex or concave at the paraxial region O; the object-side surface 41 of the fourth lens element L4 is convex at the paraxial region O, and the image-side surface 42 of the fourth lens element L4 is convex or concave at the paraxial region O; the object-side surface 51 of the fifth lens element L5 is convex at the paraxial region O, and the image-side surface 52 of the fifth lens element L5 is concave at the paraxial region O.

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may all be plastic lenses, so as to achieve the lightness and thinness of the optical lens 100 and make it easier to process each lens in a complex surface shape.

Alternatively, the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 may be made of glass, so that the optical lens 100 has a good optical effect and the temperature sensitivity of the optical lens 100 is reduced.

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may be spherical lenses or aspherical lenses. It is understood that one piece of aspherical lens can achieve the effect of correcting aberration by a plurality of spherical lenses. That is, the aspheric lens can correct aberration and reduce the number of lenses, which is advantageous for the miniaturization of the optical lens 100 and the improvement of the image quality. The specific number of the spherical lenses and the aspheric lenses can be set according to practical situations, for example, the lenses are all aspheric lenses, or the first lens L1 is a spherical lens and the rest of the lenses are aspheric lenses, or the first lens L1 and the third lens L3 are spherical lenses and the rest of the lenses are aspheric lenses, and the embodiment is not particularly limited.

In some embodiments, the optical lens 100 further includes a diaphragm 102, and the diaphragm 102 may be an aperture diaphragm and/or a field diaphragm, which may be disposed on the object side 11 side of the first lens L1 of the optical lens 100. It is understood that, in other embodiments, the stop 102 may also be disposed between other lenses, for example, between the image-side surface 12 of the first lens L1 and the object-side surface 21 of the second lens L2, and the arrangement may be adjusted according to practical situations, and the present embodiment is not limited in particular.

In some embodiments, the optical lens 100 further includes a filter 103, and the filter 103 is disposed between the fifth lens element L5 and the image plane 101 of the optical lens 100. Optionally, the optical filter 103 may be an infrared filter, so that infrared light can be filtered, the imaging quality is improved, and the imaging better conforms to the visual experience of human eyes. It is understood that the optical filter 103 may be made of an optical glass coating film or a colored glass, and may be selected according to actual needs, and the embodiment is not limited in particular.

In some embodiments, the optical lens 100 satisfies the following relationship: TTL/ImgH is more than 1.1 and less than 1.3; wherein, TTL is a distance from the object-side surface 11 of the first lens element L1 to the image plane 101 of the optical lens system 100 on the optical axis O (i.e. the total length of the optical lens system 100), and ImgH is a radius of the maximum effective image circle of the optical lens system 100. By limiting the ratio of the total length of the optical lens 100 to the radius of the maximum effective imaging circle of the optical lens 100, the total length and the image height of the optical lens 100 are effectively controlled, thereby being beneficial to realizing the characteristics of ultra-thinning and miniaturization of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 6.4< EFL FNO/T45< 7.7; wherein EFL is an effective focal length of the optical lens 100, FNO is an f-number of the optical lens 100, and T45 is a distance between the object-side surface 41 of the fourth lens L4 and the image-side surface 52 of the fifth lens L5 on the optical axis O. When the above relation is satisfied, the optical lens 100 not only can be miniaturized, but also can ensure sufficient light transmission amount, so as to satisfy the imaging requirements of the optical lens 100 for high image quality and high definition. When EFL × FNO/T45 is less than or equal to 6.4, although sufficient light flux can be provided for optical lens 100, this will increase the total length of optical lens 100, which does not meet the design requirement for miniaturization of optical lens 100; when EFL × FNO/T45 is greater than or equal to 7.7, the light flux of the optical lens 100 is insufficient, which results in low accuracy of capturing images by the optical lens 100 and is not favorable for the design requirement of high resolution imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 5.5< ALT/T1< 7; the ALT is a sum of thicknesses of the first lens L1 to the fifth lens L5 on the optical axis O, and T1 is a thickness of the first lens L1 on the optical axis O. By adjusting the proportional relationship between the total lens thickness of the first lens L1 to the fifth lens L5 on the optical axis O and the thickness of the first lens L1 on the optical axis O, the total length of the optical lens 100 can be effectively shortened and the imaging quality of the optical lens 100 can be ensured. When the above relational expression is satisfied, the design requirement for downsizing the optical lens 100 can be achieved while ensuring the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 3.5mm < EFL tan (HFOV) 4mm or less; where EFL is the effective focal length of the optical lens 100, and HFOV is half of the maximum field angle of the optical lens 100. By controlling the ratio of the effective focal length of the optical lens 100 to the tangent value of half of the maximum field angle of the optical lens 100 within a certain range, the optical lens 100 can have a good magnification ratio, which is beneficial to the optical lens 100 to have a good detail recognition capability during framing. When the above relation is satisfied, the optical lens 100 has a good magnification, so that the optical lens 100 has a good detail recognition capability during framing.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.8< | f4/EFL | < 16; where EFL is the effective focal length of the optical lens 100, and f4 is the focal length of the fourth lens L4. When the above relation is satisfied, the contribution of the fourth lens L4 to the total focal power of the optical lens 100 is appropriate, which is beneficial to improving the aberration correction capability of the optical lens 100, and in addition, the fourth lens L4 can be matched with other lenses to enable the optical lens 100 to have a better aberration correction effect, thereby ensuring that the optical lens 100 has good imaging quality. When the absolute value of f4/EFL is less than or equal to 1.8, the effective focal length of the optical lens 100 is too large, so that a larger field angle cannot be obtained, and high-resolution imaging of the optical lens 100 is not facilitated; when | f4/EFL | ≧ 16, the absolute value of the focal length of the fourth lens L4 is too large, and the contribution to the total optical power of the optical lens 100 is insufficient, which is disadvantageous for improving the aberration correction capability of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.5< f12/f1< 2; where f12 is the combined focal length of the first lens L1 and the second lens L2, and f1 is the focal length of the first lens L1. By reasonably controlling the ratio of the combined focal length of the first lens L1 and the second lens L2 to the focal length of the first lens L1, the optical performance and the processing and manufacturing difficulty of the optical lens 100 can be effectively balanced. When the above relational expression is satisfied, the optical lens 100 has good optical performance and workability.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.8< | (R2+ R3)/(R2-R3) | < 1.4; wherein R2 is the radius of curvature of the object-side surface 11 of the first lens element L1 along the optical axis O, and R3 is the radius of curvature of the image-side surface 12 of the first lens element L1 along the optical axis O. When the above relational expression is satisfied, the tendency of the thickness ratio of the object-side surface 11 and the image-side surface 12 of the first lens L1 can be well controlled, and the shape of the first lens L1 is further limited, which is not only beneficial to controlling the spherical aberration contribution of the first lens L1 within a reasonable range, so that the imaging quality of the field of view on the optical axis O and the field of view outside the optical axis O is not significantly degraded due to the change of the spherical aberration contribution, but also beneficial to improving the optical performance of the optical lens 100 and the processability of each lens.

In some embodiments, the optical lens 100 satisfies the following relationship: 1< SD41/SD42< 1.5; SD41 is the maximum effective half aperture of the object-side surface 41 of the fourth lens element L4, and SD42 is the maximum effective half aperture of the image-side surface 42 of the fourth lens element L4. When the above relation is satisfied, the aperture of the object-side surface 41 of the fourth lens element L4 and the aperture of the image plane 101 of the optical lens 100 can be reasonably arranged, and the radial dimension of the fourth lens element L4 is reduced, so that the optical lens 100 can realize a small-head design. When the optical lens 100 is applied to an electronic device, the size of the opening of the optical lens 100 on the screen of the electronic device can be reduced, and the screen occupation ratio of the electronic device is further improved. Further, when the above-described relational expression is satisfied, the fourth lens L4 has high workability, and is also advantageous in enlarging the aperture, maintaining a good light transmission amount of the optical lens 100, and further enabling the optical lens 100 to have high imaging quality. When the ratio SD41/SD42 is less than or equal to 1, the deflection degree of the incident light in the optical lens 100 is too large, the off-axis aberration is easily increased, and the imaging quality of the optical lens 100 is reduced; when SD41/SD42 is equal to or greater than 1.5, the radial dimension of the fourth lens L4 is too large, and it is difficult to realize a small head design of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 2< | (SAG6-SAG5)/SAG6| < 8; where SAG5 is the maximum sagittal height of the image-side surface 22 of the second lens L2 and SAG6 is the maximum sagittal height of the object-side surface 31 of the third lens L3. The rise of the image-side surface 22 of the second lens L2 is the distance in the direction parallel to the optical axis O between a certain point on the image-side surface 22 of the second lens L2 and the intersection point of the image-side surface 22 of the second lens L2 and the optical axis O; when the value of the sagittal height is a positive value, the point is closer to the image side of the optical lens 100 than at the center of the image side surface 22 of the second lens L2 in the direction parallel to the optical axis O; when the value of the rise is a negative value, the point is closer to the object side of the optical lens 100 than at the center of the image side surface 22 of the second lens L2 in the direction parallel to the optical axis O. Likewise, the rise of the object-side surface 31 of the third lens L3 is similar to that described above and will not be described here. When the above relation is satisfied, the shape of the image-side surface 22 of the second lens L2 is similar to the shape of the object-side surface 31 of the third lens L3, so that peripheral light rays can be smoothly transited, and the sensitivities of the second lens L2 and the third lens L3 can be reduced.

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

Example one

As shown in fig. 1, the optical lens 100 according to the first embodiment of the present disclosure includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter 103, which are sequentially disposed along an optical axis O from an object side to an image side.

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

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex at the paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the paraxial region O; the object-side surface 51 and the image-side surface 52 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 effective focal length EFL of the optical lens 100 is 3.774mm, the f-number FNO of the optical lens 100 is 2.45, half of the maximum field angle HFOV of the optical lens 100 is 46.664 °, the total length TTL of the optical lens 100 is 5.002mm, and the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 4.20 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 2 and 3 correspond to the object side surface 11 and the image side surface 12 of the first lens L1, respectively. The radius Y in table 1 is the radius of curvature of the object-side surface or the image-side surface of the corresponding surface number at the optical axis O. The first value in the "thickness" parameter list 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 object-side surface 11 of the first lens element L1 on the optical axis O. It is understood that the units of the radius Y, the thickness, and the focal length in table 1 are all mm, and the refractive index, the abbe number, and the focal length in table 1 are all obtained at a reference wavelength of 587.6 nm.

In the first embodiment, the object-side surface and the image-side surface of all the lenses are aspheric. The profile x of each aspheric lens can be defined using, but not limited to, the following aspheric equation:

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 O direction; c is the curvature at the optical axis O of the aspheric surface, c ═ 1/Y (i.e., paraxial curvature c is the inverse of the radius of curvature Y in table 1 above); k is a conic coefficient; ai is a correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order coefficient k, a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror in example one.

TABLE 1

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows a light spherical aberration curve of the optical lens 100 in the first embodiment at 656.3nm, 587.6nm and 468.1 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 the present embodiment is better.

Referring to fig. 2 (B), fig. 2 (B) is an astigmatism diagram of light rays of the optical lens 100 at a wavelength of 587.6nm according to the first embodiment. 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 represent a meridional image plane 101 curvature T and a sagittal image plane 101 curvature S, and as can be seen from (B) in fig. 2, 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 of the first embodiment at a wavelength of 587.6 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 the wavelength 587.6 nm.

Example two

As shown in fig. 3, the optical lens 100 according to the second embodiment of the present invention includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter 103, which are sequentially disposed along an optical axis O from an object side to an image side.

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

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are both concave at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex, respectively, at the paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave, respectively, at a paraxial region O.

Specifically, taking the effective focal length EFL of the optical lens 100 as 3.911mm, the f-number FNO of the optical lens 100 as 2.50, the half HFOV of the maximum field angle of the optical lens 100 as 45.093 °, the total length TTL of the optical lens 100 as 4.954mm, and the radius ImgH of the maximum effective imaging circle of the optical lens 100 as 4.12mm as examples, other parameters of the optical lens 100 are given in table 3 below, and the definitions of the parameters can be found from the description of the foregoing embodiments, which will not be repeated herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 3 are all mm, and the refractive index, the abbe number, and the focal length in table 3 are all obtained at a reference wavelength of 587.6 nm.

In the second embodiment, the object-side surface and the image-side surface of all the lenses are aspheric. The method for calculating the surface shape x of each aspheric lens can be obtained by the description of the foregoing embodiments, and will not be described herein. Table 4 below shows the high-order coefficient k, a4, a6, A8, a10, a12, a14, a16, a18, and a20 of each aspherical mirror surface used in example two.

TABLE 3

TABLE 4

Referring to fig. 4, as can be seen from the light spherical aberration diagram (a) in fig. 4, the light astigmatism diagram (B) in fig. 4, and the distortion diagram (C) in fig. 4, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, so that the optical system 100 of 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), the contents described in fig. 2 (a), fig. 2 (B), and fig. 2 (C) in the first embodiment can be referred to, and the details are not repeated herein.

EXAMPLE III

Fig. 5 shows a schematic structural diagram of an optical lens 100 according to a third embodiment of the present invention, where the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an optical filter 103, which are sequentially disposed from an object side to an image side along an optical axis O.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave, respectively, at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex at the paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave, respectively, at a paraxial region O.

Specifically, taking as an example that the effective focal length EFL of the optical lens 100 is 3.913mm, the f-number FNO of the optical lens 100 is 2.48, half of the maximum field angle HFOV of the optical lens 100 is 45.30 °, the total length TTL of the optical lens 100 is 5.097mm, and the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 4.15mm, other parameters of the optical lens 100 are given in table 5 below, and definitions of the parameters can be found from the description of the foregoing embodiments, which will not be repeated herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 5 are all mm, and the refractive index, the abbe number, and the focal length in table 5 are all obtained at a reference wavelength of 587.6 nm.

In the third embodiment, the object-side surface and the image-side surface of all the lenses are aspheric. The method for calculating the surface shape x of each aspheric lens can be obtained by the description of the foregoing embodiments, and will not be described herein. Table 6 below shows the high-order coefficient k, a4, a6, A8, a10, a12, a14, a16, a18, and a20 of each aspherical mirror surface used in example three.

TABLE 5

TABLE 6

Referring to fig. 6, as can be seen from the light spherical aberration diagram (a) in fig. 6, the light astigmatism diagram (B) in fig. 6, and the distortion diagram (C) in fig. 6, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, so that the optical system 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 fig. 2 (a), fig. 2 (B), and fig. 2 (C) in the first embodiment can be referred to, and the details are not repeated herein.

Example four

Fig. 7 shows a schematic structural diagram of an optical lens 100 according to fourth embodiment of the present invention, where the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an optical filter 103, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex at the paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex and concave, respectively, at a paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave, respectively, at a paraxial region O.

Specifically, taking as an example that the effective focal length EFL of the optical lens 100 is 4.000mm, the f-number FNO of the optical lens 100 is 2.45, half of the maximum field angle HFOV of the optical lens 100 is 45.00 °, the total length TTL of the optical lens 100 is 5.391mm, and the radius ImgH of the maximum effective imaging circle of the optical lens 100 is 4.20mm, other parameters of the optical lens 100 are given in table 7 below, and the definitions of the parameters can be found from the description of the foregoing embodiments, which will not be repeated herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 7 are all mm, and the refractive index, the abbe number, and the focal length in table 7 are all obtained at a reference wavelength of 587.6 nm.

In the fourth embodiment, the object-side surface and the image-side surface of all the lenses are aspheric. The method for calculating the surface shape x of each aspheric lens can be obtained by the description of the foregoing embodiments, and will not be described herein. Table 8 below gives the high-order coefficient k, a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror in example four.

TABLE 7

TABLE 8

Referring to fig. 8, as can be seen from the light spherical aberration diagram (a) in fig. 8, the light astigmatism diagram (B) in fig. 8, and the distortion diagram (C) in fig. 8, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, so that the optical system 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 fig. 2 (a), fig. 2 (B), and fig. 2 (C) in the first embodiment can be referred to, and details are not repeated here.

EXAMPLE five

Fig. 9 shows a schematic structural diagram of an optical lens 100 according to fifth embodiment of the present invention, where the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an optical filter 103, which are sequentially disposed from an object side to an image side along an optical axis O.

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

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex at the paraxial region O; the object-side surface 21 and the image-side surface 22 of the second lens element L2 are respectively convex and concave at the paraxial region O; the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave, respectively, at a paraxial region O; the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave, respectively, at a paraxial region O.

Specifically, taking the effective focal length EFL of the optical lens 100 as 3.827mm, the f-number FNO of the optical lens 100 as 2.55, the half HFOV of the maximum field angle of the optical lens 100 as 45.226 °, the total length TTL of the optical lens 100 as 5.000mm, and the radius ImgH of the maximum effective imaging circle of the optical lens 100 as 4.05mm as examples, other parameters of the optical lens 100 are given in table 9 below, and the definitions of the parameters can be found from the description of the foregoing embodiments, which will not be repeated herein. It is understood that the units of the radius Y, the thickness, and the focal length in table 9 are all mm, and the refractive index, the abbe number, and the focal length in table 9 are all obtained at a reference wavelength of 587.6 nm.

In example five, the object-side surface and the image-side surface of all the lenses are aspherical. The method for calculating the surface shape x of each aspheric lens can be obtained by the description of the foregoing embodiments, and will not be described herein. The high-order coefficient k, a4, a6, A8, a10, a12, a14, a16, a18, and a20 for each aspherical mirror surface in example five are shown in table 10 below.

TABLE 9

Watch 10

Referring to fig. 10, as can be seen from the light spherical aberration diagram (a) in fig. 10, the light astigmatism diagram (B) in fig. 10, and the distortion diagram (C) in fig. 10, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, so that the optical system 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 fig. 2 (a), fig. 2 (B), and fig. 2 (C) in the first embodiment can be referred to, and the details are not repeated herein.

Referring to table 11, table 11 is a summary of ratios of the relations in the first to fifth embodiments of the present invention.

TABLE 11

Relation/embodiment	Example one	Example two	EXAMPLE III	Example four	EXAMPLE five
						1.1＜TTL/ImgH<1.3	1.191	1.202	1.228	1.284	1.235
6.4<EFL*FNO/T45<7.7	7.062	6.859	7.614	6.478	6.677
						5.5<ALT/T1<7	6.600	5.713	6.398	6.294	5.522
3.5mm<EFL*tan(HFOV)≤4mm	4.000mm	3.923mm	3.954mm	4.000mm	3.857mm
						1.8<\|f4/EFL\|<16	2.143	1.848	1.939	8.751	15.735
1.5<f12/f1<2	1.950	1.705	1.847	1.959	1.746
						0.8<\|(R2+R3)/(R2-R3)\|<1.4	0.818	0.823	1.345	0.896	0.971
1<SD41/SD42<1.5	1.344	1.241	1.292	1.411	1.131
						2<\|(SAG6-SAG5)/SAG6\|<8	7.781	2.706	4.096	6.902	2.707

In a second aspect, referring to fig. 11, the present invention further discloses a camera module 200, where the camera module 200 includes a photo sensor 201 and the optical lens 100 according to any one of the first to fifth embodiments, the photo sensor 201 is disposed at an image side of the optical lens 100, and the photo sensor 201 is configured to convert an optical signal corresponding to a subject into an image signal, which is not described herein again. It can be understood that the camera module 200 having the optical lens 100 can meet the design requirements of miniaturization, large image plane and high imaging quality of the camera module 200.

In a third aspect, referring to fig. 12, the present invention further discloses an electronic apparatus 300, where the electronic apparatus 300 includes a housing and the camera module 200 as described above, and the camera module 200 is disposed in the housing. It can be understood that the electronic device 300 having the camera module 200 can meet the design requirements of miniaturization, large image plane and high imaging quality of the electronic device 300.

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 element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element arranged in this order from an object side to an image side along an optical axis;

the third lens has optical power;

wherein, TTL is a distance from an object side surface of the first lens element to an imaging surface of the optical lens on the optical axis, and ImgH is a radius of a maximum effective imaging circle of the optical lens.

2. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 6.4< EFL FNO/T45< 7.7;

and EFL is an effective focal length of the optical lens, FNO is an f-number of the optical lens, and T45 is a distance from an object side surface of the fourth lens to an image side surface of the fifth lens on the optical axis.

3. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 5.5< ALT/T1< 7;

ALT is a sum of lens thicknesses of the first lens to the fifth lens on the optical axis, and T1 is a thickness of the first lens on the optical axis.

4. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 3.5mm < EFL tan (HFOV) 4mm or less;

wherein EFL is an effective focal length of the optical lens, and HFOV is half of a maximum field angle of the optical lens.

5. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 1.8< | f4/EFL | < 16;

wherein EFL is an effective focal length of the optical lens, and f4 is a focal length of the fourth lens.

6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 1.5< f12/f1< 2;

wherein f12 is a combined focal length of the first lens and the second lens, and f1 is a focal length of the first lens.

7. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0.8< | (R2+ R3)/(R2-R3) | < 1.4;

wherein R2 is a radius of curvature of an object-side surface of the first lens at the optical axis, and R3 is a radius of curvature of an image-side surface of the first lens at the optical axis.

8. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 1< SD41/SD42< 1.5;

wherein SD41 is the maximum effective half aperture of the object-side surface of the fourth lens, and SD42 is the maximum effective half aperture of the image-side surface of the fourth lens.

9. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 2< | (SAG6-SAG5)/SAG6| < 8;

wherein SAG5 is the maximum sagittal height of the image side of the second lens and SAG6 is the maximum sagittal height of the object side of the third lens.

10. A camera module, comprising a photosensitive chip and the optical lens of any one of claims 1 to 9, wherein the photosensitive chip is disposed on an image side of the optical lens.

11. An electronic device comprising a housing and the camera module of claim 10, wherein the camera module is disposed within the housing.