CN114002822B - Optical lens, camera module and electronic equipment - Google Patents

Abstract

The present application discloses an optical lens, a camera module and electronic equipment. The optical lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged sequentially along the optical axis from the object side to the image side , the first lens has positive refractive power, and its object side and image side are respectively convex and concave at the near optical axis; the second lens has positive refractive power, and its image side is convex at the optical axis; the third lens has optical Power; the fourth lens has power, and its object side is convex at the near optical axis; the fifth lens has power, and its object side and image side are respectively convex and concave at the near optical axis, and the optical lens satisfies Relational formula: 1.2<SD11/SD21<1.6. The optical lens, camera module, and electronic equipment of the present application can realize ultra-wide-angle imaging effects on the basis of taking into account the miniaturization and thinning design of the optical lens.

Description

Optical lenses, camera modules and electronic equipment

Technical Field

The present application relates to the field of optical imaging technology, and in particular to an optical lens, a camera module and an electronic device.

Background Art

In recent years, various electronic devices equipped with camera lenses (including digital cameras, smart phones, laptops, tablet computers, etc.) are rapidly developing and popularizing. The increased portability of electronic devices has put forward higher requirements on the thickness of camera lenses. At the same time, the use of large image surface chips has become an inevitable trend. This has led to a decrease in image quality and poor processability due to the need to maintain the support of a large image surface while reducing the thickness of camera lenses. Especially for ultra-wide-angle camera lenses, it is difficult to fully miniaturize ultra-wide-angle camera lenses because conventional ultra-wide-angle camera lenses use a quasi-symmetrical structure with a central aperture. Therefore, the problem of improving the lightness and thinness of ultra-wide-angle camera lenses and maintaining good image quality needs to be solved urgently.

Summary of the invention

The embodiments of the present application disclose an optical lens, a camera module and an electronic device, which can achieve an ultra-wide-angle imaging effect while taking into account the miniaturization and lightweight design of the optical lens.

In order to achieve the above-mentioned object, in a first aspect, the present application discloses an optical lens, wherein the optical lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence from the object side to the image side along the optical axis;

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

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

The third lens has an optical power;

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

The fifth lens has optical power, and the object side surface and the image side surface of the fifth lens are convex and concave respectively at the near optical axis;

The optical lens further comprises an aperture, wherein the aperture is located between the first lens and the second lens;

The optical lens satisfies the following relationship:

1.2＜SD11/SD21＜1.6, wherein SD11 is the maximum effective semi-diameter of the object-side surface of the first lens, and SD21 is the maximum effective semi-diameter of the object-side surface of the second lens.

In the optical lens provided in the present application, since the first lens has positive focal power, it helps to shorten the overall length of the optical lens. The design that the object side surface and the image side surface of the first lens are convex and concave respectively at the near optical axis is conducive to enhancing the positive focal power of the first lens, and further provides a reasonable light incident angle for the introduction of large-angle light from the edge; the second lens has positive focal power, and the image side surface of the second lens is convex at the near optical axis, which helps to increase the focal power of the second lens, thereby gradually diffusing the light shrunk by the first lens and reducing the deflection angle of the light. The design that the object side surface of the fourth lens is concave at the near optical axis is beneficial to improving the compactness between the lenses of the optical lens and shortening the overall length of the optical lens, so as to realize the miniaturized design of the optical lens. Combined with the design that the object side surface and image side surface of the fifth lens are convex and concave respectively at the near optical axis, it is beneficial to correct distortion, astigmatism, and field curvature, so that the optical lens can meet the imaging requirements of low aberration and high image quality. At the same time, when the optical lens is applied to the camera module, it can be matched with a high-brightness photosensitive chip to achieve ultra-wide-angle and large image surface imaging.

Furthermore, the aperture of the optical lens is located between the first lens and the second lens, that is, the design of the front aperture is adopted, which is conducive to the miniaturization design of the optical lens.

In addition, by limiting the optical lens to satisfy the above relationship 1.2＜SD11/SD21＜1.6, that is, by constraining the ratio of the maximum effective semi-aperture of the object side of the first lens to the maximum effective semi-aperture of the object side of the second lens, the size of the effective semi-aperture of the object side of the first lens can be effectively controlled, and the small head and small light hole characteristics of the object side of the head lens of the optical lens can be realized. In combination with the aperture of the present application being located between the first and second lenses, the problem that the maximum effective semi-aperture of the object side of the first lens of the ultra-wide-angle optical lens in the related art is large and the small head cannot be realized is solved. When the upper limit of the above relationship is exceeded, that is, SD11/SD21＞1.6, the maximum effective semi-aperture of the first lens is too large and cannot meet the small head requirement of the optical lens. When the lower limit of the above relationship is exceeded, that is, SD11/SD21＜1.2, the maximum effective semi-aperture of the first lens is too small, and it is difficult to simultaneously ensure the reasonable center thickness of the ultra-wide angle and the first lens, that is, when the above ratio is too small, the first lens will be very close to the second lens and the aperture, resulting in the center thickness of the first lens being severely compressed.

It can be seen that the optical lens of the present application can take into account the design of ultra-wide angle, large image surface and miniaturization, and can be suitable for camera modules and electronic equipment that require miniaturization design.

As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

0.8＜|f4/R42|＜8.8;

Wherein, f4 is the focal length of the fourth lens, and R42 is the radius of curvature of the image side surface of the fourth lens at the optical axis.

By constraining the radius of curvature of the image side surface of the fourth lens at the optical axis, the focal length of the fourth lens is adjusted to avoid the influence of the process performance of the fourth lens caused by the excessive concentration of the focal length on the fourth lens. At the same time, it helps to constrain the surface shape of the object side surface and the image side surface of the fourth lens to avoid excessive bending that affects the processing technology of the fourth lens. In addition, satisfying the above relationship can further enhance the correction of higher-order aberrations and reduce the tolerance sensitivity of the optical lens on the basis of reducing tertiary aberrations such as spherical aberration, coma, and field curvature. When the lower limit of the above relationship is exceeded, the focal length of the fourth lens is too concentrated, resulting in the surface shape of the image side surface of the fourth lens being too curved, which is not conducive to the processing technology of the fourth lens. When the upper limit of the above relationship is exceeded, the focal length of the fourth lens is insufficient, which is not conducive to the correction of the aberration of the optical lens and affects the tolerance sensitivity of the optical lens.

Preferably, 0.6mm＜R42|＜3.5mm, so that, under the constraint of the curvature radius of the image side surface of the fourth lens, excessive bending of the image side surface of the fourth lens, especially the bulge in the central area, is avoided, thereby reducing the low-angle stray light reflection of the fourth lens and reducing the influence of ghosting on imaging.

As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

85°＜FOV*IMGH/TTL＜110°;

Among them, FOV is the maximum field of view of the optical lens, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, that is, the total length of the optical lens, and IMGH is half of the image height corresponding to the maximum field of view of the optical lens.

This relationship reflects the constraints of the optical lens in terms of field of view and thinness. When the above relationship is met, the optical lens can meet the demand for thinness while satisfying the ultra-wide angle of the optical lens, so that the optical lens can also have the thinness and lightness comparable to the large field of view optical lens in related technologies, meeting the market demand for miniaturization of optical lenses. When FOV*IMGH/TTL＞110°, while ensuring that the field of view of the optical lens is an ultra-wide angle, IMGH/TTL is further reduced, which will over-compress the thinness of the optical lens and is not conducive to the improvement of the performance of the optical lens. When FOV*IMGH/TTL＜85°, the optical lens is not thin enough, which is not conducive to the miniaturization design of the optical lens.

As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

110°＜FOV＜132°. When this relationship is satisfied, the optical lens can have a larger field of view, thereby achieving ultra-wide-angle imaging.

As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship: 3.7mm＜TTL＜4.15mm, so that the total length of the optical lens is kept within a small range, which can meet the design requirements of ultra-wide-angle miniaturization.

As an optional implementation, in the embodiment of the first aspect of the present application, the optical lens satisfies the following relationship: 1.9＜Fno＜2.5, where Fno is the aperture number of the optical lens. In this way, the optical lens can have a reasonable amount of light entering, which is conducive to the optical lens obtaining a reasonable resolution.

As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

0.32mm＜CT1+CT12＜0.45mm;

Wherein, CT1 is the thickness of the first lens on the optical axis, that is, the center thickness of the first lens, and CT12 is the distance from the image side surface of the first lens to the object side surface of the second lens on the optical axis, that is, the gap between the first lens and the second lens.

As can be seen from the above, the aperture of the optical lens is located between the first lens and the second lens. Combined with the axial distance from the object side of the first lens to the object side of the second lens, the distance between the first lens, the aperture and the second lens can be shortened, thereby avoiding the situation in the related art where the first lens of the optical lens is far away from the second lens, which is conducive to reducing the gap between the first lens and the second lens, so that the optical lens can be miniaturized. In addition, the center thickness of the first lens and the gap between the first lens and the second lens are controlled, so that the first lens and the second lens have reasonable processing, which is convenient for processing the first lens and the second lens, and reduces the processing difficulty of the optical lens.

Preferably, 0.05mm＜CT12＜0.2mm, so that the gap between the first lens and the second lens is maintained in a reasonable range, and the gap between the first lens and the second lens of the optical lens can be fully compressed to achieve miniaturization and small head characteristics of the optical lens.

As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

1.0＜|f1/f5|＜17;

Wherein, f1 is the focal length of the first lens, and f5 is the focal length of the fifth lens.

By constraining the ratio of the focal length of the first lens to the focal length of the fifth lens, the optical power distribution of the first lens and the fifth lens in the present optical lens can be reasonably allocated, thereby meeting the small head requirement of the optical lens while maintaining the reasonable aberration balance and resolution requirement of the optical lens. In addition, since the first lens is arranged close to the second lens and has a positive optical power, compared with the first lens with a negative optical power, the distortion of the first lens with a positive optical power to the light of a large-angle field of view is small, which is beneficial to reducing the distortion of the optical lens. In addition, combined with the control of the focal length of the fifth lens, the distortion of the optical lens can be reasonably corrected and the optical distortion can be reasonably controlled.

As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

0.18＜FFL/TTL＜0.24;

Among them, FFL is the shortest distance from the image side surface of the fifth lens to the imaging surface of the optical lens in the direction of the optical axis, that is, the back focal length of the optical lens, and TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, that is, the total length of the optical lens.

By controlling the ratio of the back focal length of the optical lens to the total length of the optical lens, the back focal length of the optical lens and the total length of the optical lens are matched to a certain extent, avoiding the unfavorable situation that the total length of the optical lens is too long and the back focal length of the optical lens is too short; a reasonable back focal length of the optical lens, when the optical lens is applied to the camera module, can avoid the situation that the optical lens and the photosensitive chip of the camera module are too close, which affects the assembly feasibility and assembly yield of the camera module, thereby improving the matching of different photosensitive chips. When FFL/TTL＞0.24, the back focal length of the optical lens accounts for too large a proportion, compressing the space of each lens of the optical lens, which is not conducive to the performance optimization of the optical lens; and when FFL/TTL＜0.18, the back focal length of the optical lens accounts for too small a proportion, making it difficult to match the optical lens with the photosensitive chip, increasing the assembly risk of the optical lens.

As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

0.52＜SD51/IMGH＜0.78;

Wherein, SD51 is the maximum effective semi-aperture of the object side of the fifth lens, and IMGH is half of the image height corresponding to the maximum field angle of the optical lens.

By limiting the ratio of the maximum effective semi-aperture of the object side of the fifth lens to the half-image height corresponding to the maximum field of view angle of the optical lens, the maximum effective semi-aperture of the object side of the fifth lens can be constrained within a reasonable range, thereby realizing a miniaturized design of the optical lens. Secondly, when the above relationship is satisfied, the lifting distance of the edge light passing through the fifth lens is appropriate, so that when the optical lens is applied to a camera module, the incident angle of the light passing through the optical lens and the photosensitive chip of the camera module can be kept appropriate, avoiding the difficulty in matching the photosensitive chip due to excessive incident angle. In addition, when the above relationship is satisfied, the lifting distance of the light is appropriate, which also provides a reasonable beam aperture for the edge light, so that the optical lens can provide a reasonable relative illumination while realizing a lightweight design, avoiding dark corners.

As an optional implementation manner, in an embodiment of the first aspect of the present application, the optical lens satisfies the following relationship:

1.4＜f23/f＜2.2;

Wherein, f23 is the combined focal length of the second lens and the third lens, and f is the effective focal length of the optical lens.

By constraining the ratio of the combined focal length of the second lens and the third lens to the effective focal length of the optical lens, the optical powers of the second lens and the third lens can be properly distributed, so that the third lens can produce various coordination properties, thereby achieving a balance of the internal aberrations of the optical lens on the basis of satisfying the miniaturized design of the optical lens, thereby helping to adjust the field curvature and astigmatism of the imaging edge of the optical lens and satisfying the imaging quality of the optical lens for the surrounding environment.

In a second aspect, the present application discloses a camera module, the camera module comprising a photosensitive chip and the optical lens as described in the first aspect, the photosensitive chip being arranged on the image side of the optical lens. The camera module with the optical lens can simultaneously satisfy the shooting effect of a wide viewing angle and take into account a miniaturized design.

In a third aspect, the present application discloses an electronic device, the electronic device comprising a housing and a camera module as described in the second aspect, the camera module being arranged in the housing. The electronic device having the camera module can simultaneously satisfy the shooting effect of a wide viewing angle and take into account a miniaturized design.

Compared with the prior art, the beneficial effects of this application are:

In the optical lens provided by the present application, in the optical lens provided by the present application, since the first lens has positive focal power, it is helpful to shorten the total length of the optical lens, and the design that the object side surface and the image side surface of the first lens are convex and concave respectively at the near optical axis is conducive to enhancing the positive focal power of the first lens, and further provides a reasonable light incident angle for the introduction of large-angle light from the edge; the second lens has positive focal power, and the image side surface of the second lens is convex at the near optical axis, which is helpful to increase the focal power of the second lens, thereby being able to gradually diffuse the light shrunk by the first lens and reduce the deflection angle of the light. The design of the object side surface of the fourth lens being concave at the near optical axis is conducive to improving the compactness between the lenses of the optical lens, shortening the total length of the optical lens, and realizing the miniaturization design of the optical lens. The design of the object side surface and image side surface of the fifth lens being convex and concave at the near optical axis is conducive to correcting distortion, astigmatism, and field curvature, so that the optical lens can meet the imaging requirements of low aberration and high image quality. At the same time, when the optical lens is applied to the camera module, it can be matched with a high-brightness photosensitive chip to achieve ultra-wide-angle and large image surface imaging. In addition, by limiting the optical lens to satisfy the above relationship 1.2＜SD11/SD21＜1.6, that is, by constraining the ratio of the maximum effective semi-aperture of the object side surface of the first lens to the maximum effective semi-aperture of the object side surface of the second lens, the size of the effective semi-aperture of the object side surface of the first lens can be effectively controlled, and the small head and small light hole characteristics of the object side surface of the head lens of the optical lens can be realized. The aperture of the present application is located between the first and second lenses, which solves the problem that the maximum effective semi-aperture of the object side of the first lens of the ultra-wide-angle optical lens in the related art is large and a small head cannot be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

FIG1 is a schematic diagram of the structure of an optical lens disclosed in the first embodiment of the present application;

FIG2 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm), and a distortion curve diagram (%) of the optical lens disclosed in the first embodiment of the present application;

FIG3 is a schematic diagram of the structure of an optical lens disclosed in a second embodiment of the present application;

FIG4 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm), and a distortion curve diagram (%) of the optical lens disclosed in the second embodiment of the present application;

FIG5 is a schematic diagram of the structure of an optical lens disclosed in a third embodiment of the present application;

FIG6 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm), and a distortion curve diagram (%) of the optical lens disclosed in the third embodiment of the present application;

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

FIG8 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm), and a distortion curve diagram (%) of the optical lens disclosed in the fourth embodiment of the present application;

FIG9 is a schematic diagram of the structure of an optical lens disclosed in a fifth embodiment of the present application;

FIG10 is a diagram of longitudinal spherical aberration (mm), astigmatism curve (mm), and distortion curve (%) of the optical lens disclosed in the fifth embodiment of the present application;

FIG11 is a schematic diagram of the structure of an optical lens disclosed in a sixth embodiment of the present application;

FIG12 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm), and a distortion curve diagram (%) of the optical lens disclosed in the sixth embodiment of the present application;

FIG13 is a schematic diagram of the structure of the lens module disclosed in the present application;

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

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

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

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

Please refer to FIG. 1 . According to the first aspect of the present application, the present application discloses an optical lens 100, which includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, which are sequentially arranged from the object side to the image side along the 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 sequentially from the object side of the first lens L1, and is finally imaged on the imaging surface 101 of the optical lens 100. Among them, the first lens L1 has positive optical power, the second lens L2 has positive optical power, the third lens L3 has positive optical power or negative optical power, the fourth lens L4 has positive optical power or negative optical power, and the fifth lens L5 has positive optical power or negative optical power.

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

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

In some embodiments, the object side surface and the image side surface of each lens in the first lens L1 to the sixth lens L6 are aspherical surfaces. That is, each lens in the first lens L1 to the sixth lens L6 is an aspherical lens. Aspherical lenses can reduce the difficulty of lens processing and can achieve more complex surface design, which is conducive to reducing the difficulty of optical lens processing and surface design.

Furthermore, considering that the optical lens 100 is mostly used in miniaturized electronic devices, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 can be plastic lenses. Plastic lenses are lighter, and when the optical lens 100 is applied to electronic devices, it can adapt to the lightweight design of the optical lens 100.

In some embodiments, the optical lens 100 further includes a stop 102, which may be an aperture stop and/or a field stop, and may be disposed between the first lens L1 and the second lens L2, that is, the stop 102 is a front stop, and the provision of the front stop can miniaturize the head lens of the optical lens 100, thereby meeting the requirement of a small head of the optical lens 100. It is understood that, in other embodiments, the stop 102 may also be disposed between other lenses or between the object side of the optical lens 100 and the object side surface 11 of the first lens L1, and the specific setting may be adjusted according to actual conditions, and this embodiment does not specifically limit this.

In some embodiments, the optical lens 100 further includes an infrared filter 60, and the infrared filter 60 is disposed between the fifth lens L5 and the imaging surface 101 of the optical lens 100. The infrared filter 60 is selected to filter out infrared light, thereby improving the imaging quality and making the imaging more in line with the visual experience of the human eye. It is understandable that the infrared filter 60 can be made of optical glass coating, or can be made of colored glass, or an infrared filter 60 of other materials, which can be selected according to actual needs and is not specifically limited in this embodiment.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.2＜SD11/SD21＜1.6, wherein SD11 is the maximum effective semi-aperture of the object side surface 11 of the first lens L1, and SD21 is the maximum effective semi-aperture of the object side surface 21 of the second lens L2. By limiting the optical lens 100 to satisfy the above relationship 1.2＜SD11/SD21＜1.6, that is, by constraining the ratio of the maximum effective semi-aperture of the object side surface 11 of the first lens L1 to the maximum effective semi-aperture of the object side surface 21 of the second lens L2, the size of the maximum effective semi-aperture of the object side surface 11 of the first lens L1 can be effectively controlled, and the small head and small light hole characteristics of the object side surface of the head lens of the optical lens 100 are achieved. In combination with the aperture 102 of the present application being located between the first lens L1 and the second lens L2, the problem that the maximum effective semi-aperture of the object side surface 11 of the first lens L1 of the ultra-wide-angle optical lens in the related art is large and a small head cannot be achieved is solved. When the upper limit of the above relationship is exceeded, that is, SD11/SD21>1.6, the maximum effective semi-aperture of the first lens L1 is too large and cannot meet the small head requirement of the optical lens 100. When the lower limit of the above relationship is exceeded, that is, SD11/SD21<1.2, the maximum effective semi-aperture of the first lens L1 is too small, and it is difficult to ensure both the ultra-wide angle and the reasonable center thickness of the first lens L1. That is, when the above ratio is too small, the first lens L1 will be very close to the second lens L2 and the aperture 102, resulting in the center thickness of the first lens L1 being severely compressed.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.8＜|f4/R42|＜8.8; wherein f4 is the focal length of the fourth lens L4, and R42 is the radius of curvature of the image-side surface 42 of the fourth lens L4 at the optical axis O.

By constraining the radius of curvature of the image side surface 42 of the fourth lens L4 at the optical axis O, the focal length of the fourth lens L4 is adjusted to avoid the influence on the process performance of the fourth lens L4 caused by the excessive concentration of the focal length on the fourth lens L4, and at the same time, it is helpful to constrain the surface shapes of the object side surface 41 and the image side surface 42 of the fourth lens L4 to avoid excessive bending and affecting the processing and processability of the fourth lens L4. In addition, satisfying the above relationship can further enhance the correction of higher-order aberrations on the basis of reducing tertiary aberrations such as spherical aberration, coma, and field curvature, and reduce the tolerance sensitivity of the optical lens 100. When the lower limit of the above relationship is exceeded, the focal length of the fourth lens L4 is too concentrated, resulting in the surface shape of the image side surface 42 of the fourth lens L4 being too curved, which is not conducive to the processing and processability of the fourth lens L4. When the upper limit of the above relationship is exceeded, the focal length of the fourth lens L4 is insufficient, which is not conducive to the correction of the aberration of the optical lens 100 and affects the tolerance sensitivity of the optical lens 100.

In some embodiments, 85°＜FOV*IMGH/TTL＜110°; wherein FOV is the maximum field of view of the optical lens 100, TTL is the distance from the object side surface 11 of the first lens L1 to the imaging surface 101 of the optical lens 100 on the optical axis O, that is, the total length of the optical lens 100, and IMGH is half of the image height corresponding to the maximum field of view of the optical lens 100.

This relationship reflects the constraints of the optical lens 100 in terms of field of view and thinness. When the above relationship is satisfied, the optical lens 100 can meet the demand for thinness while satisfying the ultra-wide angle. This allows the optical lens 100 to be comparable to the thinness of optical lenses with large field of view in related technologies, and meet the market demand for miniaturization of the optical lens 100. When FOV*IMGH/TTL＞110°, while ensuring that the field of view of the optical lens 100 is an ultra-wide angle, IMGH/TTL is further reduced, which will over-compress the thinness of the optical lens 100, and is not conducive to the improvement of the performance of the optical lens 100. When FOV*IMGH/TTL＜85°, the optical lens 100 is not thin enough, and is not conducive to the miniaturization design of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.32 mm < CT1 + CT12 < 0.45 mm; wherein CT1 is the thickness of the first lens L1 on the optical axis O, that is, the center thickness of the first lens L1, and CT12 is the distance from the image side surface 12 of the first lens L1 to the object side surface 21 of the second lens L2 on the optical axis O, that is, the gap between the first lens L1 and the second lens L2.

As can be seen from the foregoing, the aperture 102 of the optical lens 100 is located between the first lens L1 and the second lens L2. By constraining the axial distance from the object side surface 11 of the first lens L1 to the object side surface 21 of the second lens L2, the distance between the first lens L1 and the aperture 102 and the second lens L2 can be shortened, thereby avoiding the situation in the related art where the first lens of the optical lens is far away from the second lens, which is conducive to reducing the gap between the first lens L1 and the second lens L2, so that the optical lens 100 can be miniaturized. In addition, by controlling the center thickness of the first lens L1 and the gap between the first lens L1 and the second lens L2, the first lens L1 and the second lens L2 have reasonable processing, which is convenient for processing the first lens L1 and the second lens L2, and reduces the processing difficulty of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.0＜|f1/f5|＜17; wherein f1 is the focal length of the first lens L1, and f5 is the focal length of the fifth lens L5.

By constraining the ratio of the focal length of the first lens L1 to the focal length of the fifth lens L5, the optical power distribution of the first lens L1 and the fifth lens L5 in the optical lens 100 can be reasonably allocated, so as to meet the small head requirement of the optical lens 100 while maintaining the reasonable aberration balance and resolution requirements of the optical lens 100. In addition, since the first lens L1 is arranged close to the second lens L2 and has a positive optical power, compared with the first lens with a negative optical power, the first lens L1 with a positive optical power has a small distortion amount for a large-angle field of view light, which is beneficial to reducing the distortion of the optical lens 100. In addition, combined with the control of the focal length of the fifth lens L5, the distortion amount of the optical lens 100 can be reasonably corrected and controlled.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.18＜FFL/TTL＜0.24; wherein, FFL is the shortest distance from the image side surface 52 of the fifth lens L5 to the imaging surface 101 of the optical lens 100 in the direction of the optical axis, that is, the back focal length of the optical lens 100, and TTL is the distance from the object side surface 11 of the first lens L1 to the imaging surface 101 of the optical lens 100 on the optical axis, that is, the total length of the optical lens.

By controlling the ratio of the back focal length of the optical lens 100 to the total length of the optical lens 100, the back focal length of the optical lens 100 and the total length of the optical lens 100 are matched to a certain extent, avoiding the unfavorable situation that the total length of the optical lens 100 is too long and the back focal length of the optical lens 100 is too short; a reasonable back focal length of the optical lens 100, when the optical lens 100 is applied to the camera module, can avoid the situation that the optical lens 100 is too close to the photosensitive chip of the camera module, which affects the assembly feasibility and assembly yield of the camera module, thereby improving the matching of different photosensitive chips. When FFL/TTL＞0.24, the back focal length of the optical lens 100 accounts for too large a proportion, compressing the space of each lens of the optical lens 100, which is not conducive to the performance optimization of the optical lens 100; and when FFL/TTL＜0.18, the back focal length of the optical lens 100 accounts for too small a proportion, making it difficult for the optical lens 100 to match the photosensitive chip, increasing the assembly risk of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.52＜SD51/IMGH＜0.78; wherein SD51 is the maximum effective semi-aperture of the object-side surface 51 of the fifth lens L5, and IMGH is half of the image height corresponding to the maximum field angle of the optical lens 100.

By limiting the ratio of the maximum effective semi-aperture of the object side 51 of the fifth lens L5 to the image height corresponding to the maximum field of view angle of the optical lens 100, the maximum effective semi-aperture of the object side 51 of the fifth lens L5 can be constrained within a reasonable range, thereby realizing a miniaturized design of the optical lens 100. Secondly, when the above relationship is satisfied, the lifting distance of the edge light passing through the fifth lens L5 is appropriate, so that when the optical lens 100 is applied to a camera module, the incident angle of the light passing through the optical lens 100 and the photosensitive chip of the camera module can be kept appropriate, avoiding the difficulty in matching the photosensitive chip due to an excessively large incident angle. In addition, when the above relationship is satisfied, the lifting distance of the light is appropriate, which also provides a reasonable beam aperture for the edge light, so that the optical lens 100 provides a reasonable relative illumination while realizing a lightweight design, avoiding dark corners.

In some embodiments, the optical lens 100 satisfies the following relationship: 1.4＜f23/f＜2.2; wherein f23 is the combined focal length of the second lens L2 and the third lens L3, and f is the effective focal length of the optical lens 100.

By constraining the ratio of the combined focal length of the second lens L2 and the third lens L3 to the effective focal length of the optical lens 100, the optical powers of the second lens L2 and the third lens L3 can be properly distributed, so that the third lens L3 can produce various coordination properties, thereby achieving a balance of the internal aberrations of the optical lens 100 on the basis of satisfying the miniaturized design of the optical lens 100, thereby helping to adjust the field curvature and astigmatism of the imaging edge of the optical lens 100, and satisfying the imaging quality of the optical lens 100 for the surrounding environment.

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

First embodiment

The structural schematic diagram of the optical lens 100 disclosed in the first embodiment of the present application is shown in FIG1 , and the optical lens 100 comprises a first lens L1, an aperture 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60, which are arranged in sequence from the object side to the image side along the optical axis O. Among them, the first lens L1 has a positive focal power, the second lens L2 has a positive focal power, the third lens L3 has a positive focal power, the fourth lens L4 has a positive focal power, and the fifth lens L5 has a negative focal power.

Furthermore, the object-side surface 11 of the first lens L1 is convex at the near optical axis O, and the image-side surface 12 of the first lens L1 is concave at the near optical axis O; the object-side surface 21 and the image-side surface 22 of the second lens L2 are concave and convex respectively at the near optical axis O; the object-side surface 31 and the image-side surface 32 of the third lens L3 are convex and concave respectively at the near optical axis O; the object-side surface 41 and the image-side surface 42 of the fourth lens L4 are concave and convex respectively at the near optical axis O; the object-side surface 51 and the image-side surface 52 of the fifth lens L5 are convex and concave respectively at the near optical axis O.

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

Specifically, taking the effective focal length f of the optical lens 100 as 2.24 mm, the aperture number FNO of the optical lens 100 as 2.29, the maximum field of view FOV of the optical lens 100 as 127.17°, and the total length TTL of the optical lens as 3.86 mm as an example, other parameters of the optical lens 100 are given in the following Table 1. Among them, the elements from the object side to the image side along the optical axis O of the optical lens 100 are arranged in the order of the elements from top to bottom in Table 1. In the same lens, the surface with a smaller surface number is the object side of the lens, and the surface with a larger surface number is the image side of the lens, such as surface numbers 1 and 2 correspond to the object side surface 11 and the image side surface 12 of the first lens L1, respectively. The Y radius 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. The first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis, and the second value is the distance from the image side surface of the lens to the next surface on the optical axis. The value of the aperture in the "Thickness" parameter column is the distance from the aperture to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis) on the optical axis. By default, the direction from the object side of the first lens to the image side of the last lens is the positive direction of the optical axis. When the value is negative, it indicates that the aperture is set on the image side of the next surface vertex. If the aperture thickness is a positive value, the aperture is on the object side of the next surface vertex. It can be understood that the units of the Y radius, thickness, and focal length in Table 1 are all mm. And the refractive index, Abbe number, and focal length in Table 1 are obtained at a reference wavelength of 587.6nm.

Furthermore, among the first lens L1 to the sixth lens L6, each lens is an aspherical lens, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical formula:

Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis O; c is the curvature of the aspheric surface at the optical axis O, c=1/Y (i.e., the paraxial curvature c is the reciprocal of the curvature radius Y in the above Table 1); K is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 2 lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspheric lens in the first embodiment.

Table 1

Table 2

Please refer to (A) in FIG. 2 , which shows the longitudinal spherical aberration curve of the optical lens 100 in the first embodiment at wavelengths of 470.0 nm, 510.0 nm, 587.6 nm, 610.0 nm, and 650.0 nm. In (A) in FIG. 2 , the abscissa along the X-axis direction represents the focus offset, and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from (A) in FIG. 2 , the spherical aberration value of the optical lens 100 in the first embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

Please refer to (B) in FIG. 2 , which is an astigmatism curve diagram of the optical lens 100 in the first embodiment at a wavelength of 587.6 nm. The abscissa along the X-axis direction represents the focus offset, and the ordinate along the Y-axis direction represents the image height, in units of mm. The astigmatism curve represents the meridian imaging surface curvature T and the sagittal imaging surface curvature S. It can be seen from (B) in FIG. 2 that at this wavelength, the astigmatism of the optical lens 100 is well compensated.

Please refer to (C) in FIG. 2 , which is a distortion curve of the optical lens 100 in the first embodiment at a wavelength of 587.6 nm. The abscissa along the X-axis direction represents the distortion, and the ordinate along the Y-axis direction represents the image height, in units of mm. It can be seen from (C) in FIG. 2 that the distortion of the optical lens 100 is well corrected at a wavelength of 587.6 nm.

Second embodiment

The structural schematic diagram of the optical lens 100 disclosed in the second embodiment of the present application is shown in FIG3 , and the optical lens 100 comprises a first lens L1, an aperture 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60, which are arranged in sequence from the object side to the image side along the optical axis O. Among them, the first lens L1 has a positive focal power, the second lens L2 has a positive focal power, the third lens L3 has a negative focal power, the fourth lens L4 has a positive focal power, and the fifth lens L5 has a negative focal power.

Furthermore, the object-side surface 11 of the first lens L1 is a convex surface at the near optical axis O, and the image-side surface 12 of the first lens L1 is a concave surface at the near optical axis O; the object-side surface 21 and the image-side surface 22 of the second lens L2 are concave and convex surfaces at the near optical axis O, respectively; the object-side surface 31 and the image-side surface 32 of the third lens L3 are convex and concave surfaces at the near optical axis O, respectively; the object-side surface 41 and the image-side surface 42 of the fourth lens L4 are concave and convex surfaces at the near optical axis O, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens L5 are convex and concave surfaces at the near optical axis O, respectively.

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

Specifically, taking the effective focal length f of the optical lens 100 = 2.32 mm, the aperture number FNO of the optical lens 100 = 2.18, the field of view FOV of the optical lens 100 = 124.49 °, and the total length TTL of the optical lens = 4.05 mm as an example, other parameters of the optical lens 100 are given in Table 3 below. And the definition of each parameter can be derived from the description of the aforementioned embodiment, and will not be repeated here. It can be understood that the units of the Y radius, thickness, and focal length in Table 3 are all mm. And the refractive index, Abbe number, and focal length in Table 3 are obtained at a reference wavelength of 587.6 nm. Table 4 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical lens in the second embodiment.

Table 3

Table 4

Please refer to FIG. 4 . It can be seen from the longitudinal spherical aberration curve (A), the astigmatism curve (B) and the distortion curve (C) in FIG. 4 that the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in FIG. 4 (A), FIG. 4 (B) and FIG. 4 (C) can refer to the contents described in FIG. 2 (A), FIG. 2 (B) and FIG. 2 (C) in the first embodiment, which will not be repeated here.

Third embodiment

The structural schematic diagram of the optical lens 100 disclosed in the third embodiment of the present application is shown in FIG5 , and the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, and a third lens L3 which are sequentially arranged along the optical axis O from the object side to the image side. The optical lens 100 includes a first lens L1, a stop 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 which are sequentially arranged along the optical axis O from the object side to the image side. Among them, the first lens L1 has a positive optical power, the second lens L2 has a positive optical power, the third lens L3 has a negative optical power, the fourth lens L4 has a positive optical power, and the fifth lens L5 has a negative optical power.

Furthermore, the object-side surface 11 of the first lens L1 is a convex surface at the near optical axis O, and the image-side surface 12 of the first lens L1 is a concave surface at the near optical axis O; the object-side surface 21 and the image-side surface 22 of the second lens L2 are concave and convex surfaces at the near optical axis O, respectively; the object-side surface 31 and the image-side surface 32 of the third lens L3 are convex and concave surfaces at the near optical axis O, respectively; the object-side surface 41 and the image-side surface 42 of the fourth lens L4 are concave and convex surfaces at the near optical axis O, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens L5 are convex and concave surfaces at the near optical axis O, respectively.

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

Specifically, taking the effective focal length f of the optical lens 100 = 2.23 mm, the aperture number FNO of the optical lens 100 = 2.08, the field of view FOV of the optical lens 100 = 127.74 °, and the total length TTL of the optical lens = 4.10 mm as an example, other parameters of the optical lens 100 are given in Table 5 below. And the definition of each parameter can be derived from the description of the aforementioned embodiment, and will not be repeated here. It can be understood that the units of the Y radius, thickness, and focal length in Table 5 are all mm. And the refractive index, Abbe number, and focal length in Table 5 are obtained at a reference wavelength of 587.6 nm. Table 6 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical lens in the third embodiment.

Table 5

Table 6

Please refer to FIG. 6 . It can be seen from the longitudinal spherical aberration curve (A), the astigmatism curve (B) and the distortion curve (C) in FIG. 6 that the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in FIG. 6 (A), FIG. 6 (B) and FIG. 6 (C) can refer to the contents described in FIG. 2 (A), FIG. 2 (B) and FIG. 2 (C) in the first embodiment, which will not be repeated here.

Fourth embodiment

The structural schematic diagram of the optical lens 100 disclosed in the fourth embodiment of the present application is shown in FIG7 , and the optical lens 100 includes a first lens L1, a second lens L2, an aperture 102, and a third lens L3 which are sequentially arranged along the optical axis O from the object side to the image side. The optical lens 100 includes a first lens L1, an aperture 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 which are sequentially arranged along the optical axis O from the object side to the image side. Among them, the first lens L1 has a positive optical power, the second lens L2 has a positive optical power, the third lens L3 has a negative optical power, the fourth lens L4 has a negative optical power, and the fifth lens L5 has a positive optical power.

Furthermore, the object-side surface 11 of the first lens L1 is convex at the near optical axis O, and the image-side surface 12 of the first lens L1 is concave at the near optical axis O; the object-side surface 21 and the image-side surface 22 of the second lens L2 are both convex at the near optical axis O; the object-side surface 31 and the image-side surface 32 of the third lens L3 are concave and convex respectively at the near optical axis O; the object-side surface 41 and the image-side surface 42 of the fourth lens L4 are concave and convex respectively at the near optical axis O; the object-side surface 51 and the image-side surface 52 of the fifth lens L5 are convex and concave respectively at the near optical axis O.

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

Specifically, taking the effective focal length f of the optical lens 100 = 2.23 mm, the aperture number FNO of the optical lens 100 = 2.39, the field of view FOV of the optical lens 100 = 126.28 °, and the total length TTL of the optical lens = 3.90 mm as an example, other parameters of the optical lens 100 are given in Table 7 below. And the definition of each parameter can be derived from the description of the aforementioned embodiment, and will not be repeated here. It can be understood that the units of the Y radius, thickness, and focal length in Table 7 are all mm. And the refractive index, Abbe number, and focal length in Table 7 are obtained at a reference wavelength of 587.6 nm. Table 8 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical lens in the fourth embodiment.

Table 7

Table 8

Please refer to FIG8 . It can be seen from the longitudinal spherical aberration curve (A), the astigmatism curve (B) and the distortion curve (C) in FIG8 that the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in FIG8 (A), FIG8 (B) and FIG8 (C) can refer to the contents described in FIG2 (A), FIG2 (B) and FIG2 (C) in the first embodiment, which will not be repeated here.

Fifth embodiment

The structural schematic diagram of the optical lens 100 disclosed in the fifth embodiment of the present application is shown in FIG9 , and the optical lens 100 includes a first lens L1, a second lens L2, an aperture 102, and a third lens L3 which are sequentially arranged along the optical axis O from the object side to the image side. The optical lens 100 includes a first lens L1, an aperture 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 which are sequentially arranged along the optical axis O from the object side to the image side. Among them, the first lens L1 has a positive optical power, the second lens L2 has a positive optical power, the third lens L3 has a negative optical power, the fourth lens L4 has a negative optical power, and the fifth lens L5 has a positive optical power.

Furthermore, the object-side surface 11 of the first lens L1 is convex at the near optical axis O, and the image-side surface 12 of the first lens L1 is concave at the near optical axis O; the object-side surface 21 and the image-side surface 22 of the second lens L2 are both convex at the near optical axis O; the object-side surface 31 and the image-side surface 32 of the third lens L3 are respectively convex and concave at the near optical axis O; the object-side surface 41 and the image-side surface 42 of the fourth lens L4 are both concave at the near optical axis O; the object-side surface 51 and the image-side surface 52 of the fifth lens L5 are respectively convex and concave at the near optical axis O.

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

Specifically, taking the effective focal length f of the optical lens 100 = 2.46 mm, the aperture number FNO of the optical lens 100 = 2.19, the field of view FOV of the optical lens 100 = 111.19 °, and the total length TTL of the optical lens = 3.78 mm as an example, other parameters of the optical lens 100 are given in Table 9 below. And the definition of each parameter can be derived from the description of the aforementioned embodiment, and will not be repeated here. It can be understood that the units of the Y radius, thickness, and focal length in Table 9 are all mm. And the refractive index, Abbe number, and focal length in Table 9 are obtained at a reference wavelength of 587.6 nm. Table 10 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical lens in the fifth embodiment.

Table 9

Table 10

Please refer to FIG. 10 . It can be seen from the longitudinal spherical aberration curve (A), the astigmatism curve (B) and the distortion curve (C) in FIG. 10 that the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in FIG. 10 (A), FIG. 10 (B) and FIG. 10 (C) can refer to the contents described in FIG. 2 (A), FIG. 2 (B) and FIG. 2 (C) in the first embodiment, which will not be repeated here.

Sixth embodiment

The structural schematic diagram of the optical lens 100 disclosed in the sixth embodiment of the present application is shown in FIG11 , where the optical lens 100 includes a first lens L1, a second lens L2, a stop 102, and a third lens L3 arranged in sequence from the object side to the image side along the optical axis O. The optical lens 100 includes a first lens L1, a stop 102, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 arranged in sequence from the object side to the image side along the optical axis O. Among them, the first lens L1 has a positive optical power, the second lens L2 has a positive optical power, the third lens L3 has a positive optical power, the fourth lens L4 has a positive optical power, and the fifth lens L5 has a negative optical power.

Furthermore, the object-side surface 11 of the first lens L1 is a convex surface at the near optical axis O, and the image-side surface 12 of the first lens L1 is a concave surface at the near optical axis O; the object-side surface 21 and the image-side surface 22 of the second lens L2 are concave and convex surfaces at the near optical axis O, respectively; the object-side surface 31 and the image-side surface 32 of the third lens L3 are convex and concave surfaces at the near optical axis O, respectively; the object-side surface 41 and the image-side surface 42 of the fourth lens L4 are concave and convex surfaces at the near optical axis O, respectively; the object-side surface 51 and the image-side surface 52 of the fifth lens L5 are convex and concave surfaces at the near optical axis O, respectively.

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

Specifically, taking the effective focal length f of the optical lens 100 = 2.14 mm, the aperture number FNO of the optical lens 100 = 1.99, the field of view FOV of the optical lens 100 = 130.72°, and the total length TTL of the optical lens = 3.75 mm as an example, other parameters of the optical lens 100 are given in Table 11 below. And the definition of each parameter can be derived from the description of the aforementioned embodiment, and will not be repeated here. It can be understood that the units of the Y radius, thickness, and focal length in Table 11 are all mm. And the refractive index, Abbe number, and focal length in Table 11 are obtained at a reference wavelength of 587.6 nm. Table 12 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical lens in the sixth embodiment.

Table 11

Table 12

Please refer to FIG. 12. It can be seen from the longitudinal spherical aberration curve (A), the astigmatism curve (B) and the distortion curve (C) in FIG. 12 that the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in FIG. 12 (A), FIG. 12 (B) and FIG. 12 (C) can refer to the contents described in FIG. 2 (A), FIG. 2 (B) and FIG. 2 (C) in the first embodiment, which will not be repeated here.

Please refer to Table 13, which is a summary of the ratios of various relationship equations in the first to sixth embodiments of the present application.

Table 13

Please refer to Figure 13. The present application also discloses a camera module 200, which includes a photosensitive chip 201 and an optical lens 100 as in any one of the first to sixth embodiments described above, wherein the photosensitive chip 201 is disposed on the image side of the optical lens 100. The optical lens 100 is used to receive the light signal of the object being photographed and project it onto the photosensitive chip 201, and the photosensitive chip 201 is used to convert the light signal corresponding to the object being photographed into an image signal, which will not be described in detail here. It can be understood that the camera module 200 having the above-mentioned optical lens 100 can achieve an ultra-wide-angle imaging effect on the basis of taking into account the miniaturization and lightweight design of the optical lens, so as to improve the imaging quality of the optical lens 100. Since the above-mentioned technical effects have been described in detail in the embodiments of the optical lens 100, they will not be described in detail here.

Please refer to Figure 14. The present application also discloses an electronic device 300, which includes a housing 301 and the above-mentioned camera module 200, and the camera module 200 is arranged in the housing 301. Among them, the electronic device 300 can be but not limited to a mobile phone, a tablet computer, a laptop computer, a smart watch, a monitor, a driving recorder, a reversing image, etc. It can be understood that the electronic device 300 with the above-mentioned camera module 200 also has all the technical effects of the above-mentioned optical lens 100. That is, it is possible to achieve an ultra-wide-angle imaging effect on the basis of taking into account the miniaturization and thinness of the optical lens design, so as to improve the imaging quality of the optical lens 100. Since the above-mentioned technical effects have been described in detail in the embodiment of the optical lens 100, they will not be repeated here.

The optical lens, camera module and electronic device disclosed in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the optical lens, camera module and electronic device of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims (9)

1. a kind of optical lens, it is characterized in that, described optical lens has five lenses with refractive power altogether, and five described lenses comprise the first lens, the second lens that are arranged successively along optical axis from object side to image side , the third lens, the fourth lens and the fifth lens; The first lens has positive refractive power, and the object side and the image side of the first lens are respectively convex and concave at the near optical axis; The second lens has positive refractive power, and the image side of the second lens is convex at the near optical axis; The third lens has optical power; The fourth lens has a focal power, and the object side of the fourth lens is concave at the near optical axis; The fifth lens has a focal power, and the object side and the image side of the fifth lens are respectively convex and concave at the near optical axis; The optical lens also includes an aperture located between the first lens and the second lens; The optical lens satisfies the following relationship: 1.2<SD11/SD21<1.6, and 85°<FOV*IMGH/TTL<110°; Wherein, SD11 is the maximum effective semi-diameter of the object side of the first lens, SD21 is the maximum effective semi-diameter of the object side of the second lens, FOV is the maximum field of view of the optical lens, and TTL is the The distance between the object side of the first lens and the imaging plane of the optical lens on the optical axis, IMGH is half of the image height corresponding to the maximum field of view of the optical lens. 2. The optical lens according to claim 1, characterized in that: the optical lens satisfies the following relational expression: 0.8<|f4/R42|<8.8; Wherein, f4 is the focal length of the fourth lens, and R42 is the radius of curvature of the image side of the fourth lens at the optical axis. 3. The optical lens according to claim 1, characterized in that: the optical lens satisfies the following relational expression: 0.32mm<CT1+CT12<0.45mm; Wherein, CT1 is the thickness of the first lens on the optical axis, and CT12 is the distance from the image side of the first lens to the object side of the second lens on the optical axis. 4. The optical lens according to claim 1, characterized in that: the optical lens satisfies the following relational expression: 1.0<|f1/f5|<17; Wherein, f1 is the focal length of the first lens, and f5 is the focal length of the fifth lens. 5. The optical lens according to claim 1, characterized in that: the optical lens satisfies the following relational expression: 0.18<FFL/TTL<0.24; Wherein, FFL is the shortest distance from the image side of the fifth lens to the imaging surface of the optical lens in the direction of the optical axis. 6. The optical lens according to claim 1, wherein the optical lens satisfies the following relational expression: 0.52<SD51/IMGH<0.78; Wherein, SD51 is the maximum effective semi-diameter of the object side of the fifth lens, and IMGH is half of the image height corresponding to the maximum field angle of the optical lens. 7. The optical lens according to claim 1, wherein the optical lens satisfies the following relational expression: 1.4<f23/f<2.2; Wherein, f23 is the combined focal length of the second lens and the third lens, and f is the effective focal length of the optical lens. 8. A camera module, characterized in that: the camera module comprises a photosensitive chip and the optical lens according to any one of claims 1-7, and the photosensitive chip is arranged on the image side of the optical lens. 9. An electronic device, characterized in that: the electronic device comprises a housing and the camera module according to claim 8, the camera module is arranged on the housing.