CN115166941A - Optical lens, camera module and electronic equipment - Google Patents

Abstract

The invention discloses an optical lens, a camera module and an electronic device, wherein the optical lens comprises the following components which are arranged from an object side to an image side along an optical axis in sequence: the first lens element with negative refractive power has a convex object-side surface and a concave image-side surface at paraxial region, and a concave object-side surface at a paraxial region; a second lens element with positive refractive power having a convex object-side surface and a concave image-side surface at paraxial region, respectively; a third lens element with negative refractive power; a fourth lens element with positive refractive power having a convex object-side surface and a concave image-side surface at paraxial region, respectively; a fifth lens element with positive refractive power having a convex object-side surface and a concave image-side surface at paraxial region, respectively; the optical lens satisfies the relation: 0.9 sP/EPD <1.3. The optical lens, the camera module and the electronic equipment provided by the invention can ensure the imaging quality and have the characteristics of large aperture and miniaturization.

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 an electronic device.

Background technique

With the progress and development of society, people have higher and higher requirements for the imaging capabilities of electronic devices. Large aperture lenses are widely used in electronic devices because of their large light flux and can adapt to dark light shooting conditions. , In order to realize the function of large aperture, the optical lens is usually bulky and cannot be compatible with the miniaturization design requirements of electronic equipment.

SUMMARY OF THE INVENTION

The embodiment of the invention discloses an optical lens, a camera module and an electronic device, which can ensure the imaging quality and have the characteristics of large aperture and miniaturization.

In order to achieve the above object, in the first aspect, the present invention discloses an optical lens, which has five lenses with refractive power, and includes in sequence from the object side to the image side along the optical axis:

The first lens has a negative refractive power, the object side of the first lens is convex at the near optical axis, the image side of the first lens is concave at the near optical axis, and the object side of the first lens is at Near the circumference is concave;

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

The third lens has negative refractive power;

The fourth lens has a positive refractive power, the object side of the fourth lens is convex at the near optical axis, and the image side of the fourth lens is concave at the near optical axis;

The fifth lens has a positive refractive power, the object side of the fifth lens is convex at the near optical axis, and the image side of the fifth lens is concave at the near optical axis;

The optical lens satisfies the following relationship:

0.9<f/EPD<1.3;

Wherein, f is the focal length of the optical lens, and EPD is the entrance pupil diameter of the optical lens.

By limiting the first lens of the optical lens to have a negative refractive power, combined with the setting of the object side and the image side of the first lens to be convex and concave respectively at the near optical axis, it is possible to make the incident light with a larger angle enter the optical lens and expand the The range of the field of view of the optical lens, and at the same time, the incident light can be effectively converged, which is beneficial to control the size of the first lens in the direction of the vertical optical axis, and ensure that the first lens has a small diameter to meet the requirements of the miniaturization of the optical lens. In addition, the concave surface of the object side of the first lens at the near circumference is beneficial to reduce the incident angle of large-angle incident light, and reduce the risk of astigmatism at the object side, so as to reduce the image side lens (ie the second lens to fifth lens) to eliminate the pressure of aberration; combined with the second lens with negative refractive power, the object side and image side of the second lens are respectively convex and concave at the near optical axis, which can make the second lens and The surface shape of the first lens is more matched, so that the incident light transitions smoothly, which is conducive to correcting off-axis aberration and reducing the tolerance sensitivity of the optical lens. The risk of ghost images can be reduced, thereby improving the imaging quality of the optical lens. Combined with the third lens with negative refractive power, the first lens to the third lens can have negative and positive refractive power distribution, which is beneficial to correct the spherical aberration of the optical lens and Coma aberration improves the imaging quality of the optical lens; the fourth lens has a positive refractive power, combined with the setting of the object side and the image side of the fourth lens to be convex and concave respectively at the near optical axis, which can not only make the marginal field of view light effectively Convergence, reducing the deflection of the light in the marginal field of view, to correct the marginal field of view aberration caused by the incident light passing through the first lens to the third lens, and can correct the spherical aberration and coma aberration caused by the diffusion of light through the third lens. , thereby improving the imaging quality of the optical lens, and at the same time, it can also shorten the total length of the optical lens, which is conducive to the miniaturization of the optical lens; the fifth lens has a positive refractive power, and the object side and the image side of the fifth lens are in the near optical axis. are convex and concave respectively, which can make the surface shape of the fifth lens and the fourth lens highly match, reduce the tolerance sensitivity of the optical lens, and further balance the difficult-to-correction caused by the front lens group (the first lens to the fourth lens). Aberration promotes the aberration balance of the optical lens, thereby improving the imaging quality of the optical lens. At the same time, the image side of the fifth lens is concave at the near optical axis, which can ensure the imaging range of the optical lens and avoid the fifth lens. The outer diameter of the lens is too large, thereby realizing the miniaturization of the optical lens.

In addition, the optical lens satisfies 0.9<f/EPD<1.3. By limiting the ratio of the focal length of the optical lens to the diameter of the entrance pupil, it can effectively increase the amount of light entering the optical lens, improve the relative illuminance of the optical lens, and make the optical lens have a large aperture. Features, so that the optical lens can adapt to the shooting conditions of dark light, reduce the generation of vignetting, at the same time, it can also reduce the size of the Airy disk, improve the resolution of the optical lens, and improve the imaging quality of the optical lens to meet the high pixel design requirements.

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

1.9<TTL/IMGH<2.2; and/or, 0.11<BFL/TTL<0.17;

Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis (that is, the total length of the optical lens), and IMGH is the radius of the maximum effective imaging circle of the optical lens ( That is, the image height of the optical lens), and BFL is the minimum distance from the image side of the fifth lens to the imaging surface of the optical lens in a direction parallel to the optical axis (ie, the back focus of the optical lens).

By constraining the ratio of the total length to the image height of the optical lens, the total size of the optical lens can be effectively shortened, so that the optical lens can have the characteristics of a large image surface while obtaining a smaller size, which is beneficial to improve the imaging quality of the optical lens . When the ratio is lower than the lower limit, the total length of the optical lens is too small, and the air gap between the lenses is small, which increases the sensitivity between the lenses, which is not conducive to the design and assembly of the lenses. Insufficient cloth space makes the surface of the lens too curved, which is prone to high-order aberrations, which is not conducive to the aberration balance of the optical lens, which in turn leads to a decrease in the imaging quality of the optical lens; when the ratio is higher than the upper limit, the optical lens The total length is too large, which is not conducive to the miniaturized design of the optical lens.

In addition, by limiting the ratio of the back focus to the total length of the optical lens, the ratio of the back focus to the total length of the optical lens can be reasonably configured so that the light has a sufficient distance to converge to the imaging surface, so that the optical lens can meet the requirements of miniaturization. At the same time, the incident angle of the chief ray from the outermost field of view to the imaging plane is effectively controlled, so as to reduce the incident angle of the chief ray on the imaging plane, improve the relative illuminance of the optical lens, and further improve the imaging quality of the optical lens.

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

-0.5<f2/f1<0, and, -0.4<f2/f3<0;

Wherein, f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

By constraining the ratio of the focal length of the second lens to the first lens, and the ratio of the focal length of the second lens to the third lens, the refractive power of the first lens to the third lens can be kept a certain gap, which is beneficial to the The incident light collected by the first lens smoothly transitions to the rear lens group (ie, the fourth lens and the fifth lens). When the ratio is lower than the lower limit or higher than the upper limit, the aberrations generated by the first lens to the third lens cannot be eliminated synergistically, and at the same time, the incident light rays are too concentrated or cannot be reasonably diffused, which will affect the light control of the rear lens group. The large pressure causes the fourth lens and the fifth lens to bend too much, which affects the imaging quality of the optical lens.

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

0.8<CT2/CT3<1.9, and, -0.4<f2/f3<0;

Wherein, CT2 is the thickness of the second lens on the optical axis (ie the central thickness of the second lens), CT3 is the thickness of the third lens on the optical axis (ie the central thickness of the third lens) ), f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

By reasonably controlling the ratio of the center thickness of the second lens and the third lens, the center thicknesses of the second lens and the third lens can be made closer, so that the light can transition smoothly, which is beneficial to correct the chromatic aberration and spherical aberration of the optical lens. Improve the imaging quality of optical lenses.

Combined with the control of the ratio of the focal lengths of the second lens and the third lens, the refractive power of the second lens and the third lens can be reasonably configured to properly adjust the deflection angle and trend of the light, thereby further improving the imaging quality of the optical lens.

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

1.9<∑CT/∑AT<5, and, -0.4<f2/f3<0;

Among them, ΣCT is the sum of the thicknesses of the first lens to the fifth lens on the optical axis (that is, the sum of the central thicknesses of each lens of the optical lens), and ΣAT is the first lens to the The sum of the air gaps of the fifth lens on the optical axis (ie, the sum of the air gaps of the lenses of the optical lens), f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

By constraining the ratio of the sum of the center thicknesses of the lenses of the optical lens to the sum of the air gaps, the structure compactness of the optical lens can be improved, which is beneficial to the miniaturization of the optical lens, and at the same time, the air gaps between the lenses can be reasonably configured (the distance from the image side of the former lens to the object side of the latter lens), so as to ensure the uniform distribution of each lens of the optical lens, facilitate the smooth transition of light, improve the aberration and distortion of the optical lens, and improve the optical The imaging quality of the lens, on the other hand, can reduce the tolerance sensitivity of the optical lens, so that the optical lens has good optical performance, and further improves the imaging quality of the optical lens.

Combined with the control of the ratio of the focal length of the second lens and the third lens, the refractive power of the second lens and the third lens can be reasonably configured, which is beneficial to eliminate high-order aberrations and improve the imaging quality of the optical lens.

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

-5<f1/f34<0.5, and, 1<CT3/CT4<3;

Wherein, f1 is the focal length of the first lens, f34 is the combined focal length of the third lens and the fourth lens, and CT3 is the thickness of the third lens on the optical axis (that is, the thickness of the third lens central thickness), CT4 is the thickness of the fourth lens on the optical axis (ie, the central thickness of the fourth lens).

By constraining the ratio of the focal length of the first lens and the combined focal length of the third lens and the fourth lens, the first lens can be used to correct the coma and field curvature generated when the light enters the fourth lens from the third lens, so as to improve the optical lens image quality.

Combined with the constraint on the ratio of the central thickness of the third lens and the fourth lens, it can avoid that the difference between the central thicknesses of the third lens and the fourth lens is too large, which is conducive to the gentle expansion of light in the interior of the third lens, and makes the light in the The inside of the fourth lens has sufficient travel when correcting the propagation direction, so as to help the optical lens to correct chromatic aberration and spherical aberration, thereby helping to improve the imaging quality of the optical lens.

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

0.5<SD11/IMGH<0.6, and, 0<f/f5<1;

Wherein, SD11 is the maximum effective semi-diameter of the object side of the first lens, IMGH is the radius of the maximum effective imaging circle of the optical lens (ie, the image height of the optical lens), and f5 is the focal length of the fifth lens.

By constraining the ratio of the maximum effective half-aperture of the object side of the first lens to the image height of the optical lens, the step difference between the lenses of the optical lens can be reduced, which is conducive to smooth transition of light between the lenses of the optical lens. It can also increase the amount of light passing through the optical lens and improve the relative illuminance of the optical lens, so as to improve the imaging quality of the optical lens. When the ratio is lower than the lower limit or higher than the upper limit, it is more difficult to control the incident light, and a longer structure is required to achieve a smooth transition of light, which is not conducive to the miniaturization of the optical lens, and cannot ensure the relative illuminance of the optical lens. Deteriorating the image quality of the optical lens.

At the same time, combined with the control of the ratio of the focal length of the optical lens to the focal length of the fifth lens, the refractive power of the fifth lens can be reasonably configured, which is conducive to balancing the aberration problem caused by the large aperture characteristics and further improving the imaging quality of the optical lens. .

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

SAG42/SAG51<3, and, 0<f/f5<1;

Wherein, SAG42 is the distance from the maximum effective aperture of the image side of the fourth lens to the intersection of the image side of the fourth lens and the optical axis in a direction parallel to the optical axis (that is, the fourth lens’s The sag at the maximum effective semi-aperture of the image side), SAG51 is from the maximum effective aperture of the object side of the fifth lens to the intersection of the object side of the fifth lens and the optical axis parallel to the optical axis The distance in the direction (that is, the sag at the largest effective semi-aperture on the object side of the fifth lens), f5 is the focal length of the fifth lens.

By constraining the ratio of the sag at the maximum effective semi-aperture of the image side of the fourth lens to the object side of the fifth lens, the degree of curvature of the image side of the fourth lens and the object side of the fifth lens can be effectively controlled, so that the fourth The image side of the lens is more matched with the object side of the fifth lens, which is conducive to reducing the deflection angle of light and reducing the generation of off-axis chromatic aberration. At the same time, it can also improve the light throughput of the fourth lens and the fifth lens. the relative illuminance, thereby improving the imaging quality of the optical lens.

At the same time, combined with the control of the ratio of the focal length of the optical lens to the focal length of the fifth lens, the refractive power of the fifth lens can be reasonably configured, which is conducive to balancing the aberration problem caused by the large aperture characteristics and further improving the imaging quality of the optical lens. .

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

56deg<FOV/FNO<90deg;

Wherein, FOV is the field of view of the optical lens, and FNO is the aperture number of the optical lens;

By constraining the ratio of the angle of view of the optical lens to the number of apertures, it is possible to limit the angle of view of the optical lens while ensuring the large aperture characteristics of the optical lens, so as to reasonably control the incident angle of light, which is conducive to the realization of a smooth transition of light, Improve the imaging quality of optical lenses. When the ratio is lower than the lower limit, the field of view of the optical lens is too small, resulting in a reduction in the field of view of the optical lens, which is not conducive to the acquisition of the object space by the optical lens, or the aperture of the optical lens is too small, and the amount of light passing through the optical lens When the ratio is higher than the upper limit, the field of view of the optical lens is too large, so that the aperture of the optical lens is too large, which is not conducive to controlling the amount of light entering the optical lens. Light, easy to produce aberrations and distortions that are difficult to correct, thereby reducing the imaging quality of optical lenses.

In a second aspect, the present invention discloses a camera module, the camera module includes an image sensor and the optical lens according to the first aspect above, and the image sensor is disposed on the image side of the optical lens. The camera module with the optical lens has the characteristics of large aperture and miniaturization while ensuring image quality.

In a third aspect, the present invention discloses an electronic device, the electronic device includes a casing and the camera module according to the second aspect above, wherein the camera module is arranged on the casing. The electronic device with the camera module has the characteristics of large aperture and miniaturization while ensuring the imaging quality.

Compared with the prior art, the beneficial effects of the present invention are:

The invention provides an optical lens, a camera module and an electronic device. The first lens of the optical lens has a negative refractive power, and the object side and the image side of the first lens are respectively convex and concave at the near optical axis. , which can make the incident light of a larger angle enter the optical lens, expand the field of view of the optical lens, and at the same time, the incident light can be effectively converged, which is conducive to controlling the size of the first lens in the direction of the vertical optical axis, ensuring the first The first lens has a smaller diameter to meet the miniaturization design of the optical lens; in addition, the object side of the first lens is set on the concave surface near the circumference, which is beneficial to reduce the incident angle of large-angle incident light and reduce the generation of light generated by the object side. The risk of astigmatism is reduced to reduce the pressure on the image-side lenses (ie, the second lens to the fifth lens) to eliminate aberrations; combined with the second lens with negative refractive power, the object side and image side of the second lens are on the near optical axis The convex surface and the concave surface are respectively arranged at the two places, which can make the surface shape of the second lens and the first lens more matched, so that the incident light transitions smoothly, which is conducive to correcting off-axis aberration and reducing the tolerance sensitivity of the optical lens. It is beneficial to reasonably configure the air gap between the front and rear lenses to reduce the risk of ghost images, thereby improving the imaging quality of the optical lens; in combination with the third lens with negative refractive power, the first lens to the third lens can have negative and positive The negative refractive power distribution is conducive to correcting the spherical aberration and coma aberration of the optical lens and improving the imaging quality of the optical lens; the fourth lens has a positive refractive power, and the object side and the image side of the fourth lens at the near optical axis are respectively The arrangement of convex and concave surfaces can not only effectively converge the light in the marginal field of view, reduce the deflection of the light in the marginal field of view, so as to correct the marginal field of view aberration caused by the incident light passing through the first lens to the third lens, but also Correct the spherical aberration and coma aberration caused by the diffusion of light through the third lens, thereby improving the imaging quality of the optical lens, and at the same time, it can shorten the overall length of the optical lens, which is conducive to the miniaturization of the optical lens; the fifth lens has a positive refractive power , and the object side and image side of the fifth lens are convex and concave respectively at the near optical axis, which can make the surface of the fifth lens and the fourth lens highly match, reduce the tolerance sensitivity of the optical lens, and further balance the front lens The difficult-to-correct aberrations generated by the group (the first lens to the fourth lens) promote the aberration balance of the optical lens, thereby improving the imaging quality of the optical lens. At the same time, the image side of the fifth lens is concave at the near optical axis, The outer diameter of the fifth lens can be prevented from being too large while ensuring the imaging range of the optical lens, thereby realizing miniaturization of the optical lens.

In addition, the optical lens satisfies 0.9<f/EPD<1.3. By limiting the ratio of the focal length of the optical lens to the diameter of the entrance pupil, it can effectively increase the amount of light entering the optical lens, improve the relative illuminance of the optical lens, and make the optical lens have a large aperture. Features, so that the optical lens can adapt to the shooting conditions of dark light, reduce the generation of vignetting, at the same time, it can also reduce the size of the Airy disk, improve the resolution of the optical lens, and improve the imaging quality of the optical lens to meet the high pixel design requirements.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

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

2 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;

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

4 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;

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

6 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;

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

8 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;

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

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

11 is a schematic structural diagram of a camera module disclosed in the present application;

FIG. 12 is a schematic structural diagram of the electronic device disclosed in the present application.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts 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", "middle", The orientation or positional relationship indicated by "vertical", "horizontal", "horizontal", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are primarily used to better describe the invention and its embodiments, and are not intended to limit the fact that the indicated device, element or component must have a particular orientation, or be constructed and operated in a particular orientation.

In addition, some of the above-mentioned terms may be used to express other meanings besides orientation or positional relationship. For example, the term "on" may also be used to express a certain attachment or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific situations.

Furthermore, the terms "installed", "arranged", "provided", "connected", "connected" should be construed broadly. For example, it may be a fixed connection, a detachable connection, or a unitary structure; it may be a mechanical connection, or an electrical connection; it may be directly connected, or indirectly connected through an intermediary, or between two devices, elements, or components. internal communication. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

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

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

Referring to FIG. 1 , according to a first aspect of the present application, the present application discloses an optical lens 100 . The optical lens 100 has five lenses with refractive power in total, including a second lens arranged in sequence from the object side to the image side along the optical axis O. A lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5. During imaging, light enters the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 and the fifth lens L5 sequentially from the object side of the first lens L1 , and finally forms an image on the imaging surface 101 of the optical lens 100 superior. The first lens L1 has negative refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, and the fifth lens L5 has positive refractive power.

Further, 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 of the second lens L2 is at the near optical axis O. The image side 22 of the second lens L2 is concave at the near optical axis O; the object side 31 of the third lens L3 is concave or convex at the near optical axis O, and the image side 32 of the third lens L3 is near the optical axis O. The optical axis O is a concave surface or a convex surface; the object side surface 41 of the fourth lens L4 is a convex surface at the near optical axis O, and the image side surface 42 of the fourth lens L4 is a concave surface at the near optical axis O; the object side surface of the fifth lens L5 51 is convex at the near optical axis O, and the image side surface 52 of the fifth lens L5 is concave at the near optical axis O.

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

By properly configuring the surface shapes and refractive powers of the lenses between the first lens L1 and the fifth lens L5 , the optical lens 100 can have the characteristics of large aperture and miniaturization while ensuring image quality.

Further, in some embodiments, the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 and the fifth lens L5 are all made of plastic. In this case, the optical lens 100 can reduce the weight and reduce the cost. In other embodiments, the material of the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 and the fifth lens L5 can also be glass, in this case, the optical lens 100 can have a good optical effect , and at the same time, the temperature drift sensitivity of the optical lens 100 can be reduced.

In some embodiments, in order to facilitate processing and molding, the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 and the fifth lens L5 may all be aspherical lenses. It can be understood that, in other embodiments, the above-mentioned first lens L1 , second lens L2 , third lens L3 , fourth lens L4 and fifth lens L5 can also adopt spherical lenses.

In some embodiments, the optical lens 100 further includes a diaphragm STO, and the diaphragm STO can be an aperture diaphragm and/or a field diaphragm, for example, the diaphragm STO can be an aperture diaphragm, or the diaphragm STO can be a field of view light The stop, or alternatively, the stop STO may be an aperture stop and a field stop. By arranging the diaphragm STO on the object side of the first lens L1, the exit pupil can be kept away from the imaging surface 101, and the effective diameter of the optical lens 100 can be reduced without reducing the telecentricity of the optical lens 100, thereby realizing miniaturization. It can be understood that, in other embodiments, the diaphragm STO may also be arranged between other lenses, and the setting may be adjusted according to the actual situation, which is not specifically limited in this embodiment.

In some embodiments, the optical lens 100 further includes an infrared bandpass filter 60 , and the infrared bandpass filter 60 is disposed between the fifth lens L5 and the imaging surface 101 of the optical lens 100 . The infrared bandpass filter 60 is selected, which can transmit infrared light and reflect visible light to realize infrared imaging of the optical lens 100 , so that the optical lens 100 can be adapted to the dark light shooting environment such as rainy days and nights.

It can be understood that the infrared filter bandpass filter 60 can be made of optical glass coating, or made of colored glass, or the infrared bandpass filter 60 of other materials can be selected according to actual needs. This embodiment is not specifically limited.

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

0.9<f/EPD<1.3;

Wherein, f is the focal length of the optical lens 100 , and EPD is the entrance pupil diameter of the optical lens 100 .

By defining that the first lens L1 of the optical lens 100 has a negative refractive power, combined with the arrangement that the object side 11 and the image side 12 of the first lens L1 are respectively convex and concave at the near optical axis O, it is possible to make the incident light with a larger angle. Entering the optical lens 100, expanding the field of view range of the optical lens 100, and at the same time, the incident light can be effectively converged, so as to help control the size of the first lens L1 in the direction perpendicular to the optical axis O, and ensure that the first lens L1 has a smaller size. The aperture of the first lens L1 can meet the miniaturization design of the optical lens 100; in addition, the object side surface 11 of the first lens L1 is set on the concave surface near the circumference, which is beneficial to reduce the incident angle of the large-angle incident light and reduce the astigmatism at the object side end. to reduce the pressure on the image-side lenses (ie, the second lens L2 to the fifth lens L5) to eliminate aberrations; in combination with the second lens L2 with negative refractive power, the object side 21 and the image side 22 of the second lens L2 The setting of the convex surface and the concave surface at the near optical axis O can make the surface shapes of the second lens L2 and the first lens L1 more matched, so that the incident light transitions smoothly, which is conducive to correcting off-axis aberrations and reducing the optical lens 100 At the same time, it is also beneficial to reasonably configure the air gap between the front and rear lenses to reduce the risk of ghost images, thereby improving the imaging quality of the optical lens 100; combined with the third lens L3 with negative refractive power, it can make The first lens L1 to the third lens L3 have a negative and positive refractive power distribution, which is beneficial to correct the spherical aberration and coma of the optical lens 100 and improve the imaging quality of the optical lens 100; the fourth lens L4 has a positive refractive power, combined with the The object side surface 41 and the image side surface 42 of the four-lens L4 are respectively convex and concave at the near optical axis O, which can effectively converge the light of the edge field of view, reduce the deflection of the light of the edge field of view, and correct the incident light. The fringe field of view aberration generated by the first lens L1 to the third lens L3 can also correct the spherical aberration and coma aberration generated by the diffusion of the light through the third lens L3, thereby improving the imaging quality of the optical lens 100. The overall length of the optical lens 100 can be shortened to facilitate the miniaturization of the optical lens 100; the fifth lens L5 has a positive refractive power, and the object side 51 and the image side 52 of the fifth lens L5 are convex and The concave surface can make the surface shape of the fifth lens L5 and the fourth lens L4 highly matched, reduce the tolerance sensitivity of the optical lens 100, and further balance the difficult-to-correction caused by the front lens group (the first lens L1 to the fourth lens L4). Aberrations, promote the aberration balance of the optical lens 100, thereby improving the imaging quality of the optical lens 100, at the same time, the image side surface 52 of the fifth lens L5 is concave at the near optical axis O, which can ensure the imaging range of the optical lens 100. At the same time, the outer diameter of the fifth lens L5 is prevented from being too large, thereby realizing the miniaturization of the optical lens 100 .

In addition, the optical lens 100 satisfies 0.9<f/EPD<1.3. By limiting the ratio of the focal length of the optical lens 100 to the diameter of the entrance pupil, the amount of light entering the optical lens 100 can be effectively increased, and the relative illuminance of the optical lens 100 can be improved, so that the optical lens 100 has the characteristics of a large aperture, so that the optical lens 100 can adapt to the shooting conditions of dark light, reduce the generation of vignetting, and at the same time, it can also reduce the size of the Airy disk and improve the resolution of the optical lens 100, thereby improving the optical lens 100 high image quality to meet the high-pixel design requirements.

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

1.9<TTL/IMGH<2.2; and/or, 0.11<BFL/TTL<0.17;

Among them, TTL is the distance from the object side 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 the radius of the maximum effective imaging circle of the optical lens 100 (that is, the total length of the optical lens 100 ) The image height of the optical lens 100), BFL is the minimum 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 parallel to the optical axis O (ie the back focus of the optical lens 100).

By constraining the ratio of the total length to the image height of the optical lens 100, the total size of the optical lens 100 can be effectively shortened, so that the optical lens 100 can have the characteristics of a large image surface while obtaining a smaller size, thereby facilitating the improvement of the optical lens 100 image quality. When the ratio is lower than the lower limit, at the same time, the total length of the optical lens 100 is too small, and the air gap between the lenses is small, which increases the sensitivity between the lenses, which is not conducive to the design and assembly of the lenses. The arrangement space of the lens 100 is insufficient, so that the surface shape of the lens is too curved, which is easy to produce high-order aberrations, which is not conducive to the balance of the aberrations of the optical lens 100, which in turn leads to the deterioration of the image quality of the optical lens 100; when the ratio is higher than the upper For a limited time, the total length of the optical lens 100 is too large, which is not conducive to the miniaturized design of the optical lens 100 .

In addition, by limiting the ratio of the back focus to the total length of the optical lens 100, the ratio of the back focus to the total length of the optical lens 100 can be reasonably configured, so that the light has a sufficient distance to converge to the imaging surface 101, so that the optical lens 100 can be While satisfying miniaturization, the incident angle of the chief ray from the outermost field of view to the imaging surface 101 can be effectively controlled, so as to reduce the incident angle of the chief ray of the imaging surface 101, improve the relative illuminance of the optical lens 100, and further improve the imaging of the optical lens 100. quality.

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

-0.5<f2/f1<0, and, -0.4<f2/f3<0;

Wherein, f1 is the focal length of the first lens L1, f2 is the focal length of the second lens L2, and f3 is the focal length of the third lens L3.

By constraining the ratio of the focal lengths of the second lens L2 and the first lens L1, and the ratio of the focal lengths of the second lens L2 and the third lens L3, the refractive power of the first lens L1 to the third lens L3 can be kept a certain gap, On the one hand, it can help the incident light converged by the first lens L1 to smoothly transition to the rear lens group (ie, the fourth lens L4 and the fifth lens L5), and on the other hand, it can also help the rear lens group to balance spherical aberration and coma aberration. , so as to improve the imaging quality of the optical lens 100 . When the ratio is lower than the lower limit or higher than the upper limit, the aberrations generated by the first lens L1 to the third lens L3 cannot be eliminated synergistically. At the same time, the incident light rays are too concentrated or cannot be reasonably diffused, thereby controlling the light of the rear lens group. A large pressure is generated, which causes the fourth lens L4 and the fifth lens L5 to be too curved, which affects the imaging quality of the optical lens 100 .

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

0.8<CT2/CT3<1.9, and, -0.4<f2/f3<0;

Wherein, CT2 is the thickness of the second lens L2 on the optical axis O (ie the central thickness of the second lens L2), CT3 is the thickness of the third lens L3 on the optical axis O (ie the central thickness of the third lens L3), f2 is the focal length of the second lens L2, and f3 is the focal length of the third lens L3.

By reasonably controlling the ratio of the center thicknesses of the second lens L2 and the third lens L3, the center thicknesses of the second lens L2 and the third lens L3 can be made closer, so that the light can transition smoothly, which is beneficial to correct the chromatic aberration of the optical lens 100 and spherical aberration, thereby improving the imaging quality of the optical lens 100 .

Combined with the control of the ratio of the focal lengths of the second lens L2 and the third lens L3, the refractive power of the second lens L2 and the third lens L3 can be reasonably configured to properly adjust the deflection angle and trend of the light, thereby further improving the optical lens 100. image quality.

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

1.9<∑CT/∑AT<5, and, -0.4<f2/f3<0;

Among them, ΣCT is the sum of the thicknesses of the first lens L1 to the fifth lens L5 on the optical axis O (that is, the sum of the central thicknesses of the lenses of the optical lens 100 ), and ΣAT is the first lens L1 to the fifth lens L5 The sum of the air gaps on the optical axis O (ie, the sum of the air gaps of the lenses of the optical lens 100 ), f2 is the focal length of the second lens L2, and f3 is the focal length of the third lens L3.

By constraining the ratio of the sum of the center thicknesses of the lenses of the optical lens 100 to the sum of the air gaps, the compactness of the structure of the optical lens 100 can be improved, which is beneficial to the miniaturization of the optical lens 100, and at the same time, the lenses can be reasonably arranged The air gap (the distance from the image side of the previous lens to the object side of the latter lens) can ensure the uniform distribution of each lens of the optical lens 100 on the one hand, which is conducive to the smooth transition of light, and improves the aberration and the optical lens 100. Distortion can improve the imaging quality of the optical lens 100 . On the other hand, the tolerance sensitivity of the optical lens 100 can be reduced, so that the optical lens 100 has good optical performance and further improves the imaging quality of the optical lens 100 .

Combined with the control of the ratio of the focal lengths of the second lens L2 and the third lens L3, the refractive power of the second lens L2 and the third lens L3 can be reasonably configured, which is conducive to eliminating high-order aberrations and improving the imaging quality of the optical lens 100.

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

-5<f1/f34<0.5, and, 1<CT3/CT4<3;

Wherein, f1 is the focal length of the first lens L1, f34 is the combined focal length of the third lens L3 and the fourth lens L4, CT3 is the thickness of the third lens L3 on the optical axis O (that is, the central thickness of the third lens L3), CT4 is the thickness of the fourth lens L4 on the optical axis O (ie, the central thickness of the fourth lens L4).

By constraining the ratio of the focal length of the first lens L1 and the combined focal length of the third lens L3 and the fourth lens L4, the first lens L1 can be used to correct the coma and field generated when the light enters the fourth lens L4 from the third lens L3 curve to improve the imaging quality of the optical lens 100 .

Combining the constraints on the ratio of the central thicknesses of the third lens L3 and the fourth lens L4, it is possible to prevent the gap between the central thicknesses of the third lens L3 and the fourth lens L4 from being too large, which is conducive to the gentle expansion of light inside the third lens L3 , and make the light have enough travel when correcting the propagation direction inside the fourth lens L4 , so as to help the optical lens 100 to correct chromatic aberration and spherical aberration, thereby helping to improve the imaging quality of the optical lens 100 .

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

0.5<SD11/IMGH<0.6, and, 0<f/f5<1;

SD11 is the maximum effective semi-diameter of the object side surface 11 of the first lens L1, IMGH is the radius of the maximum effective imaging circle of the optical lens 100 (ie, the image height of the optical lens 100), and f5 is the focal length of the fifth lens L5.

By constraining the ratio of the maximum effective half-aperture of the object side surface 11 of the first lens L1 to the image height of the optical lens 100 , the step difference between the lenses of the optical lens 100 can be reduced, which is beneficial to make light travel between the lenses of the optical lens 100 The smooth transition can also increase the amount of light passing through the optical lens 100 and improve the relative illumination of the optical lens 100 , so as to improve the imaging quality of the optical lens 100 . When the ratio is lower than the lower limit or higher than the upper limit, the control of the incident light becomes more difficult, and a longer structure is required to achieve a smooth transition of light, which is not conducive to the miniaturization of the optical lens 100 and cannot ensure the relative stability of the optical lens 100. Illumination, resulting in the degradation of the imaging quality of the optical lens 100 .

At the same time, combined with the control of the ratio of the focal length of the optical lens 100 to the focal length of the fifth lens L5, the refractive power of the fifth lens L5 can be reasonably configured, which is beneficial to balance the aberration problem caused by the large aperture characteristic, so as to further improve the optical lens. 100 image quality.

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

SAG42/SAG51<3, and, 0<f/f5<1;

Wherein, SAG42 is the distance from the maximum effective aperture of the image side surface 42 of the fourth lens L4 to the intersection of the image side surface 42 of the fourth lens L4 and the optical axis O in the direction parallel to the optical axis O (that is, the image of the fourth lens L4 The sag at the maximum effective semi-aperture of the side 42), SAG51 is the maximum effective aperture of the object side 51 of the fifth lens L5 to the intersection of the object side 51 of the fifth lens L5 and the optical axis O in the direction parallel to the optical axis O (that is, the sag at the maximum effective semi-aperture of the object side surface 51 of the fifth lens L5), f5 is the focal length of the fifth lens L5.

By constraining the ratio of the sag at the maximum effective semi-aperture of the image side 42 of the fourth lens L4 and the object side 51 of the fifth lens L5, the image side 42 of the fourth lens L4 and the object side 51 of the fifth lens L5 can be effectively controlled The degree of curvature of the fourth lens L4 is more matched with the object side 51 of the fifth lens L5, which is conducive to reducing the deflection angle of the light, reducing the generation of off-axis chromatic aberration, and at the same time, it can also improve the fourth lens. The amount of light passing through the L4 and the fifth lens L5 can improve the relative illuminance of the optical lens 100 , thereby improving the imaging quality of the optical lens 100 .

At the same time, combined with the constraints on the ratio of the focal length of the optical lens 100 to the focal length of the fifth lens L5, the refractive power of the fifth lens L5 can be reasonably configured, which is beneficial to balance the aberration problem caused by the large aperture characteristic, so as to further improve the optical lens. 100 image quality.

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

56deg<FOV/FNO<90deg;

Wherein, FOV is the field of view of the optical lens 100, and FNO is the aperture number of the optical lens 100;

By constraining the ratio of the angle of view of the optical lens 100 to the number of apertures, it is possible to limit the angle of view of the optical lens 100 while ensuring the large aperture of the optical lens 100, so as to reasonably control the incident angle of light, thereby facilitating the realization of light The smooth transition improves the imaging quality of the optical lens 100 . When the ratio is lower than the lower limit, the field of view of the optical lens 100 is too small, which reduces the field of view of the optical lens 100, which is not conducive to the acquisition of the object space by the optical lens 100, or the aperture of the optical lens 100 is too small, and the optical lens The amount of light passing through the lens 100 is insufficient, so that the optical lens 100 produces vignetting, resulting in a decrease in the image quality of the optical lens 100; when the ratio is higher than the upper limit, the field of view of the optical lens 100 is too large, so that the aperture of the optical lens 100 is too large. It is not conducive to controlling the light entering the optical lens 100 , and it is easy to generate aberrations and distortions that are difficult to correct, thereby reducing the imaging quality of the optical lens 100 .

In addition, the object side and the image side of any one of the first lens L1 to the fifth lens L5 are aspherical, and the surface type of each aspherical lens can be limited by but not limited to the following aspherical formula:

where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, r is the distance from any point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, c=1/Y, and Y is the radius of curvature (ie, The paraxial curvature c is the reciprocal of the Y radius in Table 1), k is the conic constant, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface formula.

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

first embodiment

A schematic structural diagram of the optical lens 100 disclosed in the first embodiment of the present application is shown in FIG. 1 . The optical lens 100 includes a diaphragm STO, a first lens L1 , and a second lens arranged in sequence along the optical axis O from the object side to the image side L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , and the infrared bandpass filter 60 . The materials of the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 and the fifth lens L5 can be referred to the above-mentioned specific embodiments, and details are not repeated here.

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

Further, the object side 11 and the image side 12 of the first lens L1 are respectively convex and concave at the near optical axis O; the object side 21 and the image side 22 of the second lens L2 are respectively convex and concave at the near optical axis O. The object side 31 of the 3rd lens L3, as side 32 are respectively concave and convex at near optical axis O place; The thing side 41 of the 4th lens L4, like side 42 are respectively convex and concave at near optical axis O place; The object side 51 and the image side 52 of the penta lens L5 are convex and concave at the near optical axis O, respectively.

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

Specifically, taking the effective focal length of the optical lens 100 f=2.04mm, the aperture number of the optical lens 100 FNO=1.07, the field angle FOV=81.01deg of the optical lens 100, and the total length of the optical lens 100 TTL=3.62mm as examples, the optical lens Other parameters of the lens 100 are given in Table 1 below. The elements along the optical axis O of the optical lens 100 from the object side to the image side are sequentially arranged in the order of the elements in Table 1 from top to bottom. In the same lens, the surface with the smaller surface number is the object side of the lens, and the surface with the larger surface number is the image side of the lens. For example, surface numbers 2 and 3 correspond to the object side and the image side of the first lens L1 respectively. The Y radius in Table 1 is the curvature radius of the object side or image side of the corresponding surface number at the optical axis O. The first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image side of the lens to the rear surface on the optical axis O. The value of the aperture STO in the "thickness" parameter column is the distance from the aperture STO to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis O) on the optical axis O. By default, the object side of the first lens L1 is to the last surface. The direction of the image side of the lens is the positive direction of the optical axis O. When the value is negative, it means that the diaphragm STO is set on the image side of the vertex of the latter surface. If the thickness of the diaphragm STO is positive, the diaphragm STO is behind The object side of a surface vertex. It can be understood that the units of Y radius, thickness and focal length in Table 1 are all mm, and the refractive index and Abbe number in Table 1 are obtained at a reference wavelength of 587 nm, and the focal length is obtained at a reference wavelength of 920 nm.

k in Table 2 is the conic constant, and Table 2 gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface in the first embodiment.

Table 1

Table 2

Please refer to (A) in FIG. 2 , which shows a longitudinal spherical aberration diagram of the optical lens 100 in the first embodiment at a wavelength of 587 nm. In (A) of FIG. 2 , the abscissa along the X-axis direction represents the focus shift in mm, and the ordinate along the Y-axis direction represents the normalized field of view. It can be seen from (A) in FIG. 2 that the spherical aberration value of the optical lens 100 in the first embodiment is better, which means that the imaging quality of the optical lens 100 in this embodiment is better.

Please refer to (B) in FIG. 2 , which is a graph of astigmatism of the optical lens 100 in the first embodiment at a wavelength of 587 nm. The abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the image height, and the unit is mm. T in the astigmatism graph represents the curvature of the imaging surface 101 in the meridional direction, and S represents the curvature of the imaging surface 101 in the sagittal direction. It can be seen from (B) in FIG. 2 that at this wavelength, the optical lens 100 has a Astigmatism is well compensated.

Please refer to (C) in FIG. 2 . (C) in FIG. 2 is a distortion curve diagram of the optical lens 100 in the first embodiment at a wavelength of 587 nm. Among them, the abscissa along the X-axis direction represents the distortion, and the ordinate along the Y-axis direction represents the image height, and the unit is mm. It can be seen from (C) in FIG. 2 that at this wavelength, the distortion of the optical lens 100 is well corrected.

Second Embodiment

A schematic structural diagram of the optical lens 100 disclosed in the second embodiment of the present application is shown in FIG. 3 . The optical lens 100 includes a diaphragm STO, a first lens L1 , and a second lens arranged in sequence along the optical axis O from the object side to the image side L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , and the infrared bandpass filter 60 . The materials of the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 and the fifth lens L5 can be referred to the above-mentioned specific embodiments, and details are not repeated here.

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

Further, the object side 11 and the image side 12 of the first lens L1 are respectively convex and concave at the near optical axis O; the object side 21 and the image side 22 of the second lens L2 are respectively convex and concave at the near optical axis O. The object side 31 of the 3rd lens L3, as side 32 are respectively concave and convex at near optical axis O place; The thing side 41 of the 4th lens L4, like side 42 are respectively convex and concave at near optical axis O place; The object side 51 and the image side 52 of the penta lens L5 are convex and concave at the near optical axis O, respectively.

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

Specifically, the effective focal length of the optical lens 100 is f=2.35mm, the aperture number of the optical lens 100 is FNO=1.03, the field angle of the optical lens 100 is FOV=79.06deg, and the total length of the optical lens 100 is TTL=4.19mm.

Other parameters in the second embodiment are given in Table 3 below, and the definitions of the parameters can be obtained from the descriptions of the foregoing embodiments, which will not be repeated here. It can be understood that the units of Y radius, thickness and focal length in Table 3 are all mm, and the refractive index and Abbe number in Table 3 are obtained at a reference wavelength of 587 nm, and the focal length is obtained at a reference wavelength of 920 nm.

k in Table 4 is the conic constant, and Table 4 gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface in the second embodiment.

table 3

Table 4

Referring to FIG. 4, it can be seen from (A) longitudinal spherical aberration diagram in FIG. 4, (B) astigmatism curve diagram in FIG. 4 and (C) distortion curve diagram in FIG. Both astigmatism and distortion are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in (A) in FIG. 4 , (B) in FIG. 4 , and (C) in FIG. 4 , reference may be made to (A) and FIG. 2 in the first embodiment. The content described in (B) in FIG. 2 and (C) in FIG. 2 will not be repeated here.

Third Embodiment

A schematic structural diagram of the optical lens 100 disclosed in the third embodiment of the present application is shown in FIG. 5 . The optical lens 100 includes a diaphragm STO, a first lens L1 , and a second lens arranged in sequence along the optical axis O from the object side to the image side L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , and the infrared bandpass filter 60 . The materials of the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 and the fifth lens L5 can be referred to the above-mentioned specific embodiments, and details are not repeated here.

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

Further, the object side 11 and the image side 12 of the first lens L1 are respectively convex and concave at the near optical axis O; the object side 21 and the image side 22 of the second lens L2 are respectively convex and concave at the near optical axis O. The object side surface 31 of the 3rd lens L3, like the side surface 32 are all concave surfaces at the near optical axis O place; The object side surface 41 of the 4th lens L4, like the side surface 42 are respectively convex surface and concave surface at the near optical axis O place; The fifth lens The object side 51 and the image side 52 of L5 are convex and concave at the near optical axis O, respectively.

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

Specifically, the effective focal length of the optical lens 100 is f=2.49mm, the aperture number of the optical lens 100 is FNO=1.09, the field angle of the optical lens 100 is FOV=76.06deg, and the total length of the optical lens 100 is TTL=4.39mm.

Other parameters in the third embodiment are given in Table 5 below, and the definitions of the parameters can be obtained from the descriptions of the foregoing embodiments, which will not be repeated here. It can be understood that the units of Y radius, thickness and focal length in Table 5 are mm, and the refractive index and Abbe number in Table 5 are obtained at the reference wavelength of 587 nm, and the focal length is obtained at the reference wavelength of 920 nm.

k in Table 6 is the conic constant, and Table 6 gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 applicable to each aspherical mirror surface in the third embodiment.

table 5

Table 6

Referring to FIG. 6 , it can be seen from (A) longitudinal spherical aberration diagram in FIG. 6 , (B) astigmatism curve diagram in FIG. 6 and (C) distortion curve diagram in FIG. Both astigmatism and distortion are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in (A) in FIG. 6 , (B) in FIG. 6 , and (C) in FIG. 6 , reference may be made to (A) and FIG. 2 in the first embodiment. The content described in (B) in FIG. 2 and (C) in FIG. 2 will not be repeated here.

Fourth Embodiment

A schematic structural diagram of the optical lens 100 disclosed in the fourth embodiment of the present application is shown in FIG. 7 . The optical lens 100 includes a diaphragm STO, a first lens L1 , and a second lens arranged in sequence along the optical axis O from the object side to the image side L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , and the infrared bandpass filter 60 . The materials of the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 and the fifth lens L5 can be referred to the above-mentioned specific embodiments, and details are not repeated here.

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

Further, the object side 11 and the image side 12 of the first lens L1 are respectively convex and concave at the near optical axis O; the object side 21 and the image side 22 of the second lens L2 are respectively convex and concave at the near optical axis O. The object side surface 31 of the 3rd lens L3, like the side surface 32 are all concave surfaces at the near optical axis O place; The object side surface 41 of the 4th lens L4, like the side surface 42 are respectively convex surface and concave surface at the near optical axis O place; The fifth lens The object side 51 and the image side 52 of L5 are convex and concave at the near optical axis O, respectively.

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

Specifically, the effective focal length of the optical lens 100 is f=1.85mm, the aperture number of the optical lens 100 is FNO=0.97, the field angle of the optical lens 100 is FOV=86.35deg, and the total length of the optical lens 100 is TTL=3.58mm.

Other parameters in the fourth embodiment are given in Table 7 below, and the definitions of the parameters can be obtained from the descriptions of the foregoing embodiments, which will not be repeated here. It can be understood that the units of Y radius, thickness and focal length in Table 7 are all mm, and the refractive index and Abbe number in Table 7 are obtained at the reference wavelength of 587 nm, and the focal length is obtained at the reference wavelength of 920 nm.

k in Table 8 is the conic constant, and Table 8 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 applicable to each aspherical mirror surface in the fourth embodiment.

Table 7

Table 8

Referring to FIG. 8 , it can be seen from (A) longitudinal spherical aberration diagram in FIG. 8 , (B) astigmatism curve diagram in FIG. 8 and (C) distortion curve diagram in FIG. Both astigmatism and distortion are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in (A) in FIG. 8 , (B) in FIG. 8 , and (C) in FIG. 8 , reference may be made to (A) and FIG. 2 in the first embodiment. The content described in (B) in FIG. 2 and (C) in FIG. 2 will not be repeated here.

Fifth Embodiment

A schematic structural diagram of an optical lens 100 disclosed in the fifth embodiment of the present application is shown in FIG. 9 . The optical lens 100 includes a diaphragm STO, a first lens L1 , and a second lens arranged in sequence along the optical axis O from the object side to the image side L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , and the infrared bandpass filter 60 . The materials of the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 and the fifth lens L5 can be referred to the above-mentioned specific embodiments, and details are not repeated here.

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

Further, the object side 11 and the image side 12 of the first lens L1 are respectively convex and concave at the near optical axis O; the object side 21 and the image side 22 of the second lens L2 are respectively convex and concave at the near optical axis O. The object side 31 of the 3rd lens L3, like the side 32 are respectively convex and concave at the near optical axis O place; The thing side 41 of the fourth lens L4, like the side 42 are respectively convex and concave at the near optical axis O place; The object side 51 and the image side 52 of the penta lens L5 are convex and concave at the near optical axis O, respectively.

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

Specifically, the effective focal length of the optical lens 100 is f=3.65mm, the aperture number of the optical lens 100 is FNO=1.28, the field angle of the optical lens 100 is FOV=71.14deg, and the total length of the optical lens 100 is TTL=5.85mm.

Other parameters in the fifth embodiment are given in Table 9 below, and the definitions of the parameters can be obtained from the descriptions of the foregoing embodiments, which will not be repeated here. It can be understood that the units of Y radius, thickness and focal length in Table 9 are mm, and the refractive index and Abbe number in Table 9 are obtained at the reference wavelength of 587 nm, and the focal length is obtained at the reference wavelength of 920 nm.

k in Table 10 is the conic constant, and Table 10 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface in the fifth embodiment.

Table 9

Table 10

Referring to FIG. 10 , it can be seen from (A) longitudinal spherical aberration diagram in FIG. 10 , (B) astigmatism curve diagram in FIG. 10 and (C) distortion curve diagram in FIG. Both astigmatism and distortion are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in (A) in FIG. 10 , (B) in FIG. 10 , and (C) in FIG. 10 , reference may be made to (A) and FIG. 2 in the first embodiment. The content described in (B) in FIG. 2 and (C) in FIG. 2 will not be repeated here.

Please refer to Table 11. Table 11 is a summary of the ratios of the relational expressions in the first to fifth embodiments of the present application.

Table 11

Relation/Example first implementation Second implementation third implementation Fourth Embodiment Fifth implementation 0.9<f/EPD<1.3 1.062 1.027 1.088 0.964 1.267 1.9<TTL/IMGH<2.2 2.009 2.096 2.197 1.986 2.167 0.11<BFL/TTL<0.17 0.166 0.143 0.137 0.165 0.120 -0.5<f2/f1<0 -0.388 -0.315 -0.040 -0.492 -0.406 -0.4<f2/f3<0 -0.327 -0.077 -0.293 -0.360 -0.292 0.8<CT2/CT3<1.9 1.002 0.856 1.821 1.271 1.026 1.9<∑CT/∑AT<5 3.096 3.388 1.997 4.297 2.762 -5<f1/f34<0.5 -0.001 -1.217 -4.885 0.431 -0.650 1<CT3/CT4<3 1.663 2.606 1.337 1.332 1.086 0.5<SD11/IMGH<0.6 0.533 0.571 0.572 0.533 0.533 0<f/f5<1 0.549 0.159 0.450 0.946 0.018 SAG42/SAG51<3 -1517.555 2.685 1.234 -131.202 -1.748 56deg<FOV/FNO<90deg 75.710deg 76.757deg 69.780deg 89.021deg 57.922deg

Please refer to FIG. 11 , the present application further discloses a camera module 200 , the camera module includes an image sensor 201 and the optical lens 100 described in any one of the first to fifth embodiments above. The image sensor 201 is provided on the image side of the optical lens 100 . The optical lens 100 is used for receiving the light signal of the object and projecting it to the image sensor 201, and the image sensor 201 is used for converting the light signal corresponding to the object into an image signal, which will not be repeated here. It can be understood that the camera module 200 having the above-mentioned optical lens 100 has the characteristics of large aperture and miniaturization while ensuring the image quality. Since the above technical effects have been described in detail in the embodiment of the optical lens 100 , they will not be repeated here.

Referring to FIG. 12 , the present application further discloses an electronic device 300 , the electronic device 300 includes a casing 301 and the above-mentioned camera module 200 , and the camera module 200 is disposed in the casing 301 . Wherein, the electronic device 300 may be, but not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, a driving recorder, a reversing image, and the like. It can be understood that the electronic device 300 having the above-mentioned camera module 200 also has all the technical effects of the above-mentioned optical lens. That is, while ensuring the image quality, it has the characteristics of large aperture and miniaturization. Since the above technical effects have been described in detail in the embodiments of the optical lens, they will not be repeated here.

The optical lenses, camera modules and electronic devices disclosed in the embodiments of the present invention have been described in detail above. The principles and implementations of the present invention are described with specific examples in this paper. The optical lens, camera module and electronic device and the core idea thereof of the invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In conclusion, The contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. An optical lens system includes five lens elements with refractive power, in order from an object side to an image side along an optical axis:

a first lens element with negative refractive power having a convex object-side surface at a paraxial region thereof, a concave image-side surface at a paraxial region thereof, and a concave object-side surface at a paraxial region thereof;

a second lens element with positive refractive power having a convex object-side surface and a concave image-side surface;

a third lens element with negative refractive power;

a fourth lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

a fifth lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

the optical lens satisfies the following relational expression:

0.9<f/EPD<1.3；

wherein f is the focal length of the optical lens, and EPD is the entrance pupil diameter of the optical lens.

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

1.9 but less than TTL/IMGH <2.2; and/or, 0.11 is formed by the woven fabric with BFL/TTL less than 0.17;

wherein, TTL is a distance from an object side surface of the first lens element to an imaging surface of the optical lens along the optical axis, IMGH is a radius of a maximum effective imaging circle of the optical lens, and BFL is a minimum distance from an image side surface of the fifth lens element to the imaging surface of the optical lens along a direction parallel to the optical axis.

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

-0.5 yarn woven fabric of f2/f1<0, and-0.4 yarn woven fabric of f2/f3<0;

wherein f1 is a focal length of the first lens, f2 is a focal length of the second lens, and f3 is a focal length of the third lens.

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

0.8 yarn-woven fabric (CT2/CT 3) is less than 1.9, and-0.4 yarn-woven fabric (f2/f 3) is less than 0;

wherein CT2 is the thickness of the second lens element on the optical axis, CT3 is the thickness of the third lens element on the optical axis, f2 is the focal length of the second lens element, and f3 is the focal length of the third lens element.

5. An optical lens according to claim 1, characterized in that the optical lens satisfies the relation:

1.9< ∑ CT/Σ AT <5, and-0.4</f 2/f3<0;

Σ CT is the sum of the thicknesses of the first lens to the fifth lens on the optical axis, Σ AT is the sum of the air gaps of the first lens to the fifth lens on the optical axis, f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

6. An optical lens according to claim 1, characterized in that the optical lens satisfies the relation:

-5-t f1/f34<0.5, and 1-t ct3/CT4<3;

wherein f1 is a focal length of the first lens element, f34 is a combined focal length of the third lens element and the fourth lens element, CT3 is a thickness of the third lens element on the optical axis, and CT4 is a thickness of the fourth lens element on the optical axis.

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

0.5-woven SD11/IMGH <0.6, and 0<f/f5<1;

wherein SD11 is the maximum effective half aperture of the object-side surface of the first lens element, IMGH is the radius of the maximum effective imaging circle of the optical lens, and f5 is the focal length of the fifth lens element.

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

SAG42/SAG51<3, and 0<f/f5<1;

SAG42 is a distance from a position of the maximum effective aperture of the image-side surface of the fourth lens to an intersection point of the image-side surface of the fourth lens and the optical axis in a direction parallel to the optical axis, SAG51 is a distance from a position of the maximum effective aperture of the object-side surface of the fifth lens to an intersection point of the object-side surface of the fifth lens and the optical axis in the direction parallel to the optical axis, and f5 is a focal length of the fifth lens.

9. The utility model provides a module of making a video recording which characterized in that: the camera module comprises an optical lens according to any one of claims 1-8 and an image sensor, the image sensor being disposed on an image side of the optical lens.

10. An electronic device, characterized in that: the electronic device comprises a housing and the camera module of claim 9, the camera module being disposed on the housing.

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