CN114019655B - Optical lens, camera module and electronic equipment - Google Patents

Abstract

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

Description

Optical lens, camera module and electronic equipment

Technical Field

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

Background

Along with the pursuit of people for thinning and miniaturization of electronic products, the structural characteristics of thinning and miniaturization of an optical lens are combined with the shooting effects of large image surface and high imaging quality, so that the trend of development of the optical lens is gradually becoming. In the related art, in order to achieve a large image plane and achieve a higher imaging quality, the number of lenses is increased to correct the aberration of the optical lens, however, the increase of the number of lenses not only increases the difficulty of designing, processing, shaping and assembling the optical lens, but also is not beneficial to the design requirement of miniaturization of the optical lens.

Disclosure of Invention

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

In order to achieve the above object, in a first aspect, the present invention discloses an optical lens including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in order from an object side to an image side along an optical axis;

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

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

the third lens has optical power;

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

the fifth lens element has optical power, wherein an object-side surface of the fifth lens element is convex at a paraxial region thereof, and an image-side surface of the fifth lens element is concave at a paraxial region thereof;

the optical lens satisfies the following relation: 1.1 < TTL/ImgH <1.3;

wherein 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 (i.e. the total length of the optical lens), and ImgH is the radius of the maximum effective imaging circle of the optical lens.

In the optical lens of the application, the first lens with positive focal power and the second lens with negative focal power are adopted, the object side surface of the first lens is a convex surface at the paraxial region, the image side surface of the second lens is a concave surface at the paraxial region, and the mutual matching of the first lens and the second lens is beneficial to converging the light rays entering the optical lens and correcting the spherical aberration of the optical lens on the optical axis so as to improve the imaging quality of the optical lens. The object side surface of the fourth lens is a convex surface at the paraxial region, so that the total length of the optical lens can be shortened, aberration can be corrected, the emergent angle of light can be pressed, and the miniaturized design of the optical lens and the imaging quality of the optical lens are facilitated. The object side surface of the fifth lens is a convex surface at the paraxial region, and the image side surface of the fifth lens is a concave surface at the paraxial region, so that aberration generated by the first lens to the fourth lens can be corrected, aberration balance of the optical lens is ensured, imaging quality of the optical lens is improved, smooth transition of marginal view field rays to an imaging surface at a small deflection angle is facilitated, and the characteristic of large image surface of the optical lens is realized. Therefore, the optical lens achieves the design requirements of miniaturization, large image surface and high imaging quality by reasonably configuring the focal power and the surface shape of each lens. In addition, the ratio of the total length of the optical lens to the radius of the maximum effective imaging circle of the optical lens is limited, so that the total length and the image height of the optical lens are effectively controlled, and further the ultrathin and miniaturized characteristics of the optical lens are facilitated.

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

When the relation is satisfied, the optical lens not only can realize miniaturized design, but also can ensure enough light quantity so as to satisfy the imaging requirements of high image quality and high definition of the optical lens. When EFL is less than or equal to 6.4, although enough light flux can be provided for the optical lens, the total length of the optical lens can be increased, and the design requirement of miniaturization of the optical lens is not met; when EFL is greater than or equal to 7.7, the quantity of light passing through the optical lens is insufficient, so that the accuracy of capturing images by the optical lens is low, and the design requirement of high-resolution imaging quality of the optical lens is not facilitated.

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

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

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

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

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

When the relation is satisfied, the fourth lens has proper focal power contribution to the whole optical lens, which is beneficial to improving the aberration correction capability of the optical lens. When the |f4/EFL| is less than or equal to 1.8, the effective focal length of the optical lens is too large, a larger field angle cannot be obtained, and high-resolution imaging of the optical lens is not facilitated; when the absolute value of the focal length of the fourth lens is larger than or equal to 16, the total focal power contribution of the optical lens is insufficient, and the aberration correction capability of the optical lens is not improved.

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

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

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

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

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

When the relation is satisfied, the aperture of the object side surface of the fourth lens and the aperture of the imaging surface of the optical lens are reasonably configured, so that the radial size of the fourth lens is reduced, and the optical lens is designed to be small in head. When the optical lens is applied to electronic equipment, the size of an opening of the optical lens on a screen of the electronic equipment can be reduced, and the screen occupation ratio of the electronic equipment is further improved. In addition, when the above relation is satisfied, the workability of the fourth lens is high, which is also beneficial to expanding the aperture, and the optical lens is kept to have good light flux, so that the optical lens has higher imaging quality. When SD41/SD42 is less than or equal to 1, the deflection degree of the incident light in the optical lens is too large, off-axis aberration is easy to increase, and the imaging quality of the optical lens is reduced; when SD41/SD42 is larger than or equal to 1.5, the radial dimension of the fourth lens is too large, and the small head design of the optical lens is difficult to realize.

As an alternative implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 2< | (SAG 6-SAG 5)/SAG 6| <8; wherein SAG5 is the maximum sagittal height of the image side surface of the second lens, and SAG6 is the maximum sagittal height of the object side surface of the third lens.

When the above relation is satisfied, the shape of the image side surface of the second lens element is similar to the shape of the object side surface of the third lens element, so that the peripheral light rays can be smoothly transitioned, and the sensitivity of the second lens element and the third lens element can be reduced.

In a second aspect, the present invention discloses an image capturing module, where the image capturing module includes a photosensitive chip and the optical lens described in the first aspect, and the photosensitive chip is disposed on an image side of the optical lens. The camera module with the optical lens of the first aspect can realize the design requirements of miniaturization, large image surface and high imaging quality of the camera module.

In a third aspect, the invention discloses an electronic device, which comprises a housing and the camera module set in the second aspect, wherein the camera module set is arranged in the housing. The electronic equipment with the camera module can meet the design requirements of miniaturization, large image surface and high imaging quality of the electronic equipment.

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

the optical lens comprises a first lens with positive focal power and a second lens with negative focal power, wherein the object side surface of the first lens is convex at a paraxial region, the image side surface of the second lens is concave at a paraxial region, and the first lens and the second lens are matched with each other, so that light rays injected into the optical lens are converged, spherical aberration of the optical lens on an optical axis is corrected, and imaging quality of the optical lens is improved. The object side surface of the fourth lens is a convex surface at the paraxial region, so that the total length of the optical lens can be shortened, aberration can be corrected, the emergent angle of light can be pressed, and the miniaturized design of the optical lens and the imaging quality of the optical lens are facilitated. The object side surface of the fifth lens is a convex surface at the paraxial region, and the image side surface of the fifth lens is a concave surface at the paraxial region, so that aberration generated by the first lens to the fourth lens can be corrected, aberration balance of the optical lens is ensured, imaging quality of the optical lens is improved, smooth transition of marginal view field rays to an imaging surface at a small deflection angle is facilitated, and the characteristic of large image surface of the optical lens is realized. In addition, the optical lens satisfies the relation 1.1 < TTL/ImgH <1.3, and the characteristics of ultrathin and miniaturized optical lens are facilitated by controlling the total length and the image height of the optical lens. Therefore, the optical lens provided by the invention can realize the design requirements of miniaturization, large image surface and high imaging quality of the optical lens.

Drawings

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

FIG. 1 is a schematic diagram of an optical lens according to an embodiment of the present invention;

FIG. 2 is a graph of light spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to an embodiment of the present invention;

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

FIG. 4 is a graph of light spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to a second embodiment of the present invention;

FIG. 5 is a schematic diagram of an optical lens according to a third embodiment of the present invention;

FIG. 6 is a graph of light ray spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to a third embodiment of the present invention;

FIG. 7 is a schematic diagram of an optical lens according to a fourth embodiment of the present invention;

FIG. 8 is a graph of light ray spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to a fourth embodiment of the present invention;

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

FIG. 10 is a graph of light ray spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to the fifth embodiment of the present invention;

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

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

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present invention and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present invention will be understood by those of ordinary skill in the art according to the specific circumstances.

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

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.

The technical scheme of the invention will be further described with reference to the examples and the accompanying drawings.

Referring to fig. 1, according to a first aspect of the present invention, an optical lens 100 is disclosed, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 sequentially disposed from an object side to an image side along an optical axis O. In imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 in order from the object side of the first lens L1 and finally forms an image on the imaging surface 101 of the optical lens 100. Wherein the first lens L1 has positive optical power, the second lens L2 has negative optical power, and the third lens L3, the fourth lens L4, and the fifth lens L5 each have positive optical power or negative optical power.

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

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can be plastic lenses, so that the optical lens 100 is light and thin and is easy to process the complex surface types of the lenses.

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

The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may be spherical lenses or aspherical lenses. It is understood that one aspherical lens can achieve the effect of correcting aberrations by a plurality of spherical lenses. That is, the use of an aspherical lens can correct aberrations and reduce the number of lenses used, which is advantageous in meeting the requirements of miniaturization of the optical lens 100 and improving imaging quality. The specific number of the spherical lenses and the aspherical lenses may be set according to practical situations, for example, the above lenses are all aspherical lenses, or the above first lens L1 is a spherical lens, and the rest of the lenses are aspherical lenses, or the first lens L1 and the third lens L3 are spherical lenses, and the rest of the lenses are aspherical lenses, which is not limited specifically in this embodiment.

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

In some embodiments, the optical lens 100 further includes a filter 103, and the filter 103 is disposed between the fifth lens L5 and the imaging surface 101 of the optical lens 100. Optionally, the optical filter 103 may be an infrared optical filter, so that infrared light can be filtered out, and the imaging quality is improved, so that the imaging better meets the visual experience of human eyes. It is to be understood that the optical filter 103 may be made of an optical glass coating or may be made of a colored glass, and may be specifically selected according to practical needs, which is not particularly limited in this embodiment.

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

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

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

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

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

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

In some embodiments, the optical lens 100 satisfies the following relationship: 0.8< | (R2+R3)/(R2-R3) | <1.4; wherein R2 is a radius of curvature of the object side surface 11 of the first lens element L1 at the optical axis O, and R3 is a radius of curvature of the image side surface 12 of the first lens element L1 at the optical axis O. When the above relation is satisfied, the thickness ratio trend of the object side surface 11 and the image side surface 12 of the first lens L1 can be well controlled, so that the shape of the first lens L1 is limited, and the spherical aberration contribution of the first lens L1 is advantageously controlled within a reasonable range, so that the imaging quality of the field of view on the optical axis O and the field of view outside the optical axis O cannot be obviously degraded due to the change of the spherical aberration contribution, and the optical performance of the optical lens 100 and the workability of each lens are also advantageously improved.

In some embodiments, the optical lens 100 satisfies the following relationship: 1< SD41/SD42<1.5; here, SD41 is the maximum effective half-caliber of the object side surface 41 of the fourth lens element L4, and SD42 is the maximum effective half-caliber of the image side surface 42 of the fourth lens element L4. When the above relation is satisfied, the aperture of the object side surface 41 of the fourth lens element L4 and the aperture of the imaging surface 101 of the optical lens assembly 100 can be reasonably configured, so that the radial dimension of the fourth lens element L4 is reduced, and the optical lens assembly 100 can realize a small-head design. When the optical lens 100 is applied to an electronic device, the size of the opening of the optical lens 100 on the screen of the electronic device can be reduced, so that the screen occupation ratio of the electronic device can be improved. In addition, when the above relation is satisfied, the workability of the fourth lens L4 is high, which is advantageous for expanding the aperture, maintaining the optical lens 100 with a good light flux, and further, enabling the optical lens 100 to have a high imaging quality. When SD41/SD42 is less than or equal to 1, the deflection degree of the incident light ray in the optical lens 100 is too large, off-axis aberration is easy to increase, and the imaging quality of the optical lens 100 is reduced; when SD41/SD42 is larger than or equal to 1.5, the radial dimension of the fourth lens L4 is too large, and the small-head design of the optical lens 100 is difficult to realize.

In some embodiments, the optical lens 100 satisfies the following relationship: 2< | (SAG 6-SAG 5)/SAG 6| <8; wherein SAG5 is the maximum sagittal height of the image side surface 22 of the second lens L2, and SAG6 is the maximum sagittal height of the object side surface 31 of the third lens L3. The sagittal height of the image-side surface 22 of the second lens L2 is a distance between a point on the image-side surface 22 of the second lens L2 and an intersection point of the image-side surface 22 of the second lens L2 and the optical axis O along a direction parallel to the optical axis O; when the sagittal value is positive, in a direction parallel to the optical axis O, the point is closer to the image side of the optical lens 100 than at the center of the image side 22 of the second lens L2; when the value of the sagittal height is negative, in the direction parallel to the optical axis O, the point is closer to the object side of the optical lens 100 than at the center of the image side 22 of the second lens L2. Also, the sagittal height of the object-side surface 31 of the third lens element L3 is similar to that described above, and will not be repeated here. When the above relation is satisfied, the shape of the image side surface 22 of the second lens element L2 is similar to the shape of the object side surface 31 of the third lens element L3, so that the peripheral light can be smoothly transitioned, and the sensitivity of the second lens element L2 and the third lens element L3 can be reduced.

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

Example 1

As shown in fig. 1, a schematic structural diagram of an optical lens 100 according to an embodiment of the present invention is shown, where the optical lens 100 includes a diaphragm 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an optical filter 103 sequentially disposed from an object side to an image side along an optical axis O.

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

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

Specifically, taking as an example the effective focal length efl= 3.774mm of the optical lens 100, the f-number fno=2.45 of the optical lens 100, half hfov= 46.664 of the maximum field angle of the optical lens 100, the total length ttl=5.002 mm of the optical lens 100, and the radius imgh=4.20 mm of the maximum effective imaging circle of the optical lens 100, other parameters of the optical lens 100 are given in table 1 below. The elements from the object side to the image side are sequentially arranged in the order of the elements from top to bottom in table 1 along the optical axis O of the optical lens 100. In the same lens element, the surface with smaller surface number is the object side surface of the lens element, and the surface with larger surface number is the image side surface of the lens element, and the surface numbers 2 and 3 correspond to the object side surface 11 and the image side surface 12 of the first lens element L1, respectively. The radius Y in table 1 is the radius of curvature of the object side or image side of the corresponding plane number at the optical axis O. The first value in the "thickness" parameter array of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image side surface of the lens to the latter surface on the optical axis O. The value of the aperture 102 in the "thickness" parameter row is the distance between the aperture 102 and the object side surface 11 of the first lens L1 on the optical axis O. It is 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 all obtained at a reference wavelength of 587.6 nm.

In the first embodiment, the object side surface and the image side surface of all the lenses are aspherical surfaces. The profile x of each aspherical lens can be defined using, 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 the position with the height h along the optical axis O direction; c is the curvature of the aspherical surface at the optical axis O, c=1/Y (i.e., paraxial curvature c is the inverse of the radius of curvature Y in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. The higher order coefficients k, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example one are given in Table 2 below.

TABLE 1

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows an optical spherical aberration diagram of the optical lens 100 in the first embodiment at 656.3nm, 587.6nm and 468.1 nm. In fig. 2 (a), the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which indicates that the imaging quality of the optical lens 100 in the present embodiment is better.

Referring to fig. 2 (B), fig. 2 (B) is a light astigmatism diagram of the optical lens 100 with a wavelength of 587.6nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents focus offset, and the ordinate along the Y-axis direction represents image height in mm. The astigmatism curves represent the meridional imaging plane 101 curvature T and the sagittal imaging plane 101 curvature S, and it can be seen from fig. 2 (B) that at this wavelength, the astigmatism of the optical lens 100 is well compensated.

Referring to fig. 2 (C), fig. 2 (C) is a graph showing distortion of the optical lens 100 at a wavelength of 587.6nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents distortion, and the ordinate along the Y-axis direction represents image height in mm. As can be seen from fig. 2 (C), the distortion of the optical lens 100 becomes well corrected at the wavelength of 587.6 nm.

Example two

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

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

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

Specifically, taking the effective focal length efl= 3.911mm of the optical lens 100, the f-number fno=2.50 of the optical lens 100, half hfov= 45.093 of the maximum field angle of the optical lens 100, the total length ttl= 4.954mm of the optical lens 100, and the radius imgh=4.12 mm of the maximum effective imaging circle of the optical lens 100 as examples, other parameters of the optical lens 100 are given in the following table 3, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is 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 all obtained at a reference wavelength of 587.6 nm.

In the second embodiment, the object side surfaces and the image side surfaces of all the lenses are aspherical surfaces. The calculation method of the surface shape x of each aspheric lens can be obtained by the description of the foregoing embodiments, and is not described herein. The higher order coefficients k, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example two are given in Table 4 below.

TABLE 3 Table 3

TABLE 4 Table 4

Referring to fig. 4, as can be seen from the graph of (a) optical spherical aberration in fig. 4, the graph of (B) optical spherical aberration in fig. 4, and the graph of (C) distortion in fig. 4, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 4 (a), fig. 4 (B), and fig. 4 (C), reference may be made to the descriptions in the first embodiment regarding fig. 2 (a), fig. 2 (B), and fig. 2 (C), and the descriptions are omitted here.

Example III

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

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

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

Specifically, taking the effective focal length efl=3.913 mm of the optical lens 100, the f-number fno=2.48 of the optical lens 100, half hfov=45.30 of the maximum field angle of the optical lens 100, the total length ttl= 5.097mm of the optical lens 100, and the radius imgh=4.15 mm of the maximum effective imaging circle of the optical lens 100 as examples, other parameters of the optical lens 100 are given in the following table 5, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is 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 all obtained at a reference wavelength of 587.6 nm.

In the third embodiment, the object side surface and the image side surface of all the lenses are aspherical surfaces. The calculation method of the surface shape x of each aspheric lens can be obtained by the description of the foregoing embodiments, and is not described herein. The higher order coefficients k, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example three are given in Table 6 below.

TABLE 5

TABLE 6

Referring to fig. 6, as can be seen from the graph of (a) optical spherical aberration in fig. 6, the graph of (B) optical spherical aberration in fig. 6, and the graph of (C) distortion in fig. 6, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 6 (a), 6 (B) and 6 (C), reference may be made to the descriptions in the first embodiment regarding fig. 2 (a), 2 (B) and 2 (C), and the descriptions are omitted here.

Example IV

As shown in fig. 7, a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present invention is shown, and the optical lens 100 includes a diaphragm 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an optical filter 103 sequentially disposed from an object side to an image side along an optical axis O.

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

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

Specifically, taking the effective focal length efl=4.000 mm of the optical lens 100, the f-number fno=2.45 of the optical lens 100, half hfov=45.00 of the maximum field angle of the optical lens 100, the total length ttl= 5.391mm of the optical lens 100, and the radius imgh=4.20 mm of the maximum effective imaging circle of the optical lens 100 as examples, other parameters of the optical lens 100 are given in the following table 7, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is 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 all obtained at a reference wavelength of 587.6 nm.

In the fourth embodiment, the object side surfaces and the image side surfaces of all the lenses are aspherical surfaces. The calculation method of the surface shape x of each aspheric lens can be obtained by the description of the foregoing embodiments, and is not described herein. The higher order coefficients k, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example four are given in Table 8 below.

TABLE 7

TABLE 8

Referring to fig. 8, as can be seen from the (a) light spherical aberration graph in fig. 8, the (B) light astigmatic graph in fig. 8, and the (C) distortion graph in fig. 8, the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 are well controlled, so that the optical system 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 8 (a), 8 (B) and 8 (C), reference may be made to the descriptions in the first embodiment regarding fig. 2 (a), 2 (B) and 2 (C), and the descriptions are omitted here.

Example five

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

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

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

Specifically, taking the effective focal length efl= 3.827mm of the optical lens 100, the f-number fno=2.55 of the optical lens 100, half hfov= 45.226 of the maximum field angle of the optical lens 100, the total length ttl=5.000 mm of the optical lens 100, and the radius imgh=4.05 mm of the maximum effective imaging circle of the optical lens 100 as examples, other parameters of the optical lens 100 are given in the following table 9, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is 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 all obtained at a reference wavelength of 587.6 nm.

In embodiment five, the object side and image side surfaces of all lenses are aspherical surfaces. The calculation method of the surface shape x of each aspheric lens can be obtained by the description of the foregoing embodiments, and is not described herein. The higher order coefficients k, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example five are given in Table 10 below.

TABLE 9

Table 10

Referring to fig. 10, as can be seen from the graph of (a) optical spherical aberration in fig. 10, the graph of (B) optical spherical aberration in fig. 10, and the graph of (C) distortion in fig. 10, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 10 (a), 10 (B) and 10 (C), reference may be made to the descriptions in fig. 2 (a), 2 (B) and 2 (C) in the first embodiment, and the descriptions are omitted here.

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

TABLE 11

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

In a second aspect, referring to fig. 11, the present invention further discloses an image capturing module 200, where the image capturing module 200 includes a photosensitive chip 201 and the optical lens 100 according to any one of the first to fifth embodiments, the photosensitive chip 201 is disposed on an image side of the optical lens 100, and the photosensitive chip 201 is configured to convert an optical signal corresponding to a subject into an image signal, which is not described herein. It can be appreciated that the image capturing module 200 with the optical lens 100 can achieve the design requirements of miniaturization, large image plane and high imaging quality of the image capturing module 200.

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

The optical lens, the camera module and the electronic device disclosed in the embodiments of the present invention are described in detail, and specific examples are applied to the description of the principles and the implementation modes of the present invention, and the description of the above embodiments is only used to help understand the optical lens, the camera module, the electronic device and the core ideas thereof; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present invention, the present disclosure should not be construed as limiting the present invention in summary.

Claims (10)

1. An optical lens, characterized in that five lens elements with refractive power are provided in total, comprising a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element which are arranged in order from an object side to an image side along an optical axis;

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

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

the third lens has optical power;

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

the fifth lens element has optical power, wherein an object-side surface of the fifth lens element is convex at a paraxial region thereof, and an image-side surface of the fifth lens element is concave at a paraxial region thereof;

the optical lens satisfies the following relation: 1.1 < TTL/ImgH <1.3;

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

the optical lens satisfies the following relation: 0.8< | (R2+R3)/(R2-R3) | <1.4;

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

2. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 6.4< EFL < FNO/T45<7.7;

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

3. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 5.5< ALT/T1<7;

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

4. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 3.5mm < EFL tan (HFOV). Ltoreq.4 mm;

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

5. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 1.8< |f4/EFL| <16;

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

6. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 1.5< f12/f1<2;

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

7. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 1< SD41/SD42<1.5;

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

8. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 2< | (SAG 6-SAG 5)/SAG 6| <8;

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

9. An image pickup module, wherein the image pickup module comprises a photosensitive chip and the optical lens according to any one of claims 1 to 8, and the photosensitive chip is disposed on an image side of the optical lens.

10. An electronic device, comprising a housing and the camera module of claim 9, wherein the camera module is disposed in the housing.