CN113933967A

CN113933967A - Optical lens, camera module and electronic equipment

Info

Publication number: CN113933967A
Application number: CN202111201283.2A
Authority: CN
Inventors: 张文燕; 杨健; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2022-01-14
Anticipated expiration: 2041-10-14
Also published as: CN113933967B

Abstract

The invention discloses an optical lens, a camera module and electronic equipment, wherein the optical lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged in sequence from an object side to an image side along an optical axis; the optical lens satisfies the following relation: 0.6 mm < FNO/ImgH <0.9/mm, thereby can rationally control the number of diaphragm and optical lens's the radial proportion of effective imaging circle, thereby still have less number of diaphragm and great effective imaging circle radius when guaranteeing this optical lens to realize miniaturized design, and then improve optical lens's the light inlet quantity, simultaneously great effective imaging circle radius can make optical lens be applied to the module of making a video recording when, can match the great sensitive chip of sensitization area, still have the imaging effect of higher pixel when guaranteeing optical lens to satisfy miniaturized design, with the definition that improves the formation of image.

Description

Optical lens, camera module and electronic equipment

Technical Field

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

Background

With the miniaturization of electronic devices, optical lenses integrated in the electronic devices are also required to be miniaturized. However, it is an urgent problem to improve the imaging clarity of the optical lens while satisfying the miniaturization design of the optical lens.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, a camera module and electronic equipment.

In order to achieve the above object, in a first aspect, embodiments of the present invention disclose an optical lens including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in order from an object side to an image side along an optical axis; the first lens element with positive refractive power has a convex object-side surface at paraxial region; the second lens element with refractive power has a convex object-side surface at paraxial region; the third lens element, the fourth lens element and the fifth lens element all have refractive power, and an image-side surface of the fourth lens element at a paraxial region is convex; the optical lens satisfies the following relation: 0.6/mm < FNO/ImgH < 0.9/mm; and the FNO is the f-number of the optical lens, and the ImgH is the radius of an effective imaging circle of the optical lens. Because this optical lens satisfies above-mentioned relational expression, can rationally control the diaphragm number and optical lens's effective imaging circle radius's proportion to still have less diaphragm number and great effective imaging circle radius when guaranteeing this optical lens to realize miniaturized design. The light inlet quantity of the optical lens can be improved by setting a smaller diaphragm number, so that the imaging definition of the optical lens is improved, especially, the imaging effect of the optical lens under a dark light environment can be enhanced, the optical lens can be suitable for shooting in dark light environments such as night scenes, rainy days and starry sky, and the shooting requirement of a customer on the dark light environment is met. In addition, because this optical lens still has great formation of image circle radius to when this optical lens was applied to the module of making a video recording, great effective formation of image circle radius can match the great sensitive optical chip of photosensitive area, still has the imaging effect of higher pixel when guaranteeing optical lens to satisfy miniaturized design, with the definition that improves the formation of image.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.3< ET1/CT1< 0.8; ET1 is a distance from the maximum effective aperture of the object-side surface of the first lens element to the maximum effective aperture of the image-side surface of the first lens element in the optical axis direction, i.e., an edge thickness of the first lens element, and CT1 is a thickness of the first lens element in the optical axis direction, i.e., a center thickness of the first lens element. Because the first lens is closest to the object side and is mainly used for collecting light information from an object space to an image space, the curvature of the surface of the first lens can be effectively controlled by reasonably controlling the ratio of the edge thickness to the center thickness of the first lens, so that the range of light collected by the first lens is more reasonable, namely, the optical lens is controlled to have a reasonable field angle. In addition, the situation that the processing sensitivity of the first lens is higher due to the fact that the thickness of the edge of the first lens is too thin relative to the thickness of the center can be avoided, and the processing difficulty of the first lens is favorably reduced.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.8< ∑ ET/Σ CT <1.2 and 0.8< ET3/CT3< 2; Σ ET is a sum of distances in an optical axis direction from a maximum effective aperture position of an object side surface of each lens element in the optical lens to a maximum effective aperture position of an image side surface, Σ CT is a sum of distances in the optical axis direction from the object side surface of each lens element in the optical lens to the image side surface, ET3 is a distance in the optical axis direction from the maximum effective aperture position of the object side surface of the third lens element to the maximum effective aperture position of the image side surface of the third lens element, and CT3 is a thickness of the third lens element in the optical axis direction. As the ratio of the sum of the thicknesses of the edges of the five lenses of the optical lens to the sum of the thicknesses of the centers of the five lenses of the optical lens can be reasonably controlled to be less than 1.2, the optical path difference between paraxial rays and marginal rays of the optical lens can be balanced, the field curvature can be effectively improved, and the distortion of the optical lens can be reduced. Meanwhile, the ratio of the edge thickness to the center thickness of the third lens can be reasonably controlled due to 0.8< ET3/CT3<2, so that the optical path difference between the edge light and the paraxial light of the optical lens can be effectively balanced, and the field curvature of the optical lens can be corrected. In addition, the processing sensitivity of the third lens can be reduced, so that the processing difficulty is reduced, and the production yield of the optical lens is improved.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 2< f/f1< 3; wherein f is an effective focal length of the optical lens, and f1 is a focal length of the first lens. Through the proportion of the effective focal length of the optical lens and the focal length of the first lens, the aberration generated by the first lens can be effectively corrected, so that the shooting definition is improved, the processing sensitivity of the optical lens can be guaranteed to be lower, and the processing difficulty of the optical lens is reduced.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -2< (R3+ R4)/f2< -0.05; wherein R3 is a radius of curvature of an object-side surface of the second lens at the optical axis, R4 is a radius of curvature of an image-side surface of the second lens at the optical axis, and f2 is a focal length of the second lens. The curvature radius of the object side surface and the curvature radius of the image side surface of the second lens at the optical axis and the focal length of the second lens can be reasonably configured, so that the optical path difference between marginal rays and paraxial rays of the optical lens can be balanced, the field curvature and astigmatism generated by the first lens can be corrected, the processing sensitivity of the optical lens is reduced, and the production yield of the optical lens is improved.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.5< ImgH FNO/TTL < 1.1; wherein, TTL is a distance on the optical axis from the object-side surface of the first lens element to the image plane of the optical lens, that is, a total length of the optical lens. Because 0.5< ImgH/TTL FNO <1.1 to can rationally control optical lens's effective imaging circle radius, optical lens's total length and the proportion of f-number, thereby when can guaranteeing that this optical lens has great image plane, can also satisfy optical lens's miniaturized design, in addition, can also control optical lens's the light flux amount through controlling the f-number, thereby improve optical lens's shooting definition.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0< Alt-Agt <0.09 mm; the third lens element includes a fourth lens element, a fifth lens element, an air gap between an image side surface of the fourth lens element and an object side surface of the fifth lens element, and an air gap between the image side surface of the fourth lens element and the object side surface of the fifth lens element. The difference between the maximum air gap and the minimum air gap of the fourth lens and the fifth lens is controlled to be 0-0.09 mm, namely, the difference between the surface types of the image side surface of the fourth lens and the object side surface of the fifth lens is controlled to be small, so that the processing sensitivity of the image side surface of the fourth lens and the object side surface of the fifth lens is low, and the production yield of the optical lens is improved.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 4< | (R1-R2)/f1| < 16; wherein R1 is a radius of curvature of an object-side surface of the first lens at the optical axis, R2 is a radius of curvature of an image-side surface of the first lens at the optical axis, and f1 is a focal length of the first lens. The ratio of the curvature radius of the object side surface and the curvature radius of the image side surface of the first lens to the focal length of the first lens is reasonably controlled, so that the optical lens has a more reasonable field angle. In addition, the surface types of the object side surface and the image side surface of the first lens can be effectively controlled, so that the processing sensitivity of the first lens is reduced, the processing difficulty of the first lens is reduced, and the optical lens is ensured to have better production yield.

In a second aspect, the present invention discloses a camera module, which includes a photosensitive chip and the optical lens according to the first aspect, wherein the photosensitive chip is disposed on an image side of the optical lens. The camera module with the optical lens of the first aspect has all the technical effects of the optical lens of the first aspect, namely, the optical lens reasonably controls the ratio of the f-number to the effective imaging circle radius of the optical lens, so that the optical lens is guaranteed to have a smaller f-number while realizing miniaturization design, the light incoming amount of the optical lens is improved, and the imaging definition of the optical lens is improved. The optical lens can have a larger effective imaging circle radius, and the imaging definition of the optical lens is further improved.

In a third aspect, the present invention discloses an electronic device, which includes the camera module set of the second aspect of the housing, and the camera module set is disposed on the housing. The electronic device having the camera module according to the second aspect also has all the technical effects of the optical lens according to the first aspect. Namely, the optical lens of the electronic device reasonably controls the ratio of the f-number to the effective imaging circle radius of the optical lens, so that the optical lens has a smaller f-number while realizing the miniaturization design, thereby improving the light incoming amount of the optical lens and the imaging definition of the optical lens. The optical lens can have a larger effective imaging circle radius, and the imaging definition of the optical lens is further improved.

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

adopt the optical lens that this embodiment provided, module and electronic equipment make a video recording, have positive refractive power through setting up first lens, be favorable to the light stability in the low-angle to converge into optical lens, simultaneously, the object side of first lens is the convex surface in optical axis department, can assemble light, is favorable to increasing the bore of first lens simultaneously, guarantees that optical lens obtains sufficient light inlet quantity, and then realizes the big light ring characteristic, is favorable to improving and shoots the definition. The object side surface of the second lens and the image side surface of the fourth lens are convex surfaces at the position of the lower beam axis, so that the incident light can be better converged to reduce the angle of the incident light after entering the optical lens, the light can be smoothly transited to the third lens, the long-focus performance can be favorably realized, and the total length of the optical lens can be favorably shortened. In addition, the convex image-side surface of the fourth lens element is arranged at the paraxial region, which is favorable for increasing the incident angle of light entering the fourth lens element and balancing chromatic aberration and astigmatism generated by the first three lens elements. Because the optical lens meets the requirement that FNO/ImgH is less than 0.9/mm, the optical lens has smaller f-number and larger effective imaging circle radius while ensuring the miniaturization design by reasonably controlling the ratio of the f-number to the effective imaging circle radius of the optical lens. The light inlet quantity of the optical lens can be improved by setting a smaller diaphragm number, the imaging definition of the optical lens is improved, and particularly the imaging effect of the optical lens under a dark light environment can be enhanced, so that the optical lens can be suitable for shooting in dark light environments such as night scenes, rainy days and starry sky, and the shooting requirement of a customer on the dark light environment is met. In addition, because this optical lens still has great formation of image circle radius to when this optical lens was applied to the module of making a video recording, great effective formation of image circle radius can match the great sensitive optical chip of photosensitive area, still has the imaging effect of higher pixel when guaranteeing optical lens to satisfy miniaturized design, with the definition that improves the formation of image.

Drawings

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

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

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

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

fig. 4 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

fig. 6 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);

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

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

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

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

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

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

Detailed Description

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.

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

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.

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

Referring to fig. 1, the present application discloses an optical lens 100, wherein the optical lens 100 includes a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4 and a fifth lens element L5, which are sequentially disposed along an optical axis o from an object side to an image side. During imaging, light rays enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 in sequence from the object side surface S1 of the first lens L1, and are finally imaged on the imaging surface 101 of the optical lens 100. The first lens element L1 has positive refractive power, and the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 all have refractive power (i.e., the refractive power may be positive or negative).

Further, the object-side surface S1 of the first lens element L1 is convex at the paraxial region o, the object-side surface S3 of the second lens element L2 is convex at the paraxial region o, and the image-side surface S6 of the fourth lens element L4 is convex at the paraxial region o.

Have positive refractive power through setting up first lens L1, be favorable to the light stability in the small angle to converge into optical lens 100, simultaneously, the object side S1 of first lens L1 is the convex surface in optical axis o department, can assemble light, be favorable to increasing first lens L1' S bore simultaneously, guarantee that optical lens 100 obtains sufficient light incident amount, and then realize the big light ring characteristic, be favorable to improving and shoot the definition. By providing the object-side surface S3 of the second lens L2 and the image-side surface S6 of the fourth lens L4 as convex surfaces at the paraxial region o, the light rays are better converged, thereby contributing to shortening the overall length of the optical lens 100.

It is considered that the optical lens 100 may be applied to an electronic apparatus such as an in-vehicle device, a driving recorder, or an automobile. When the optical lens 100 is used as a camera on an automobile body, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can all be made of glass, so that the optical lens 100 has a good optical effect and can reduce the influence of temperature on the lenses. Of course, some lenses of the plurality of lenses of the optical lens 100 may be made of glass, and some lenses may be made of plastic, so that while the effect of reducing temperature on the lenses is ensured to achieve a better imaging effect, the processing cost of the lenses can be reduced, and the weight of the lenses can be reduced, thereby reducing the processing cost of the optical lens 100 and reducing the overall weight of the optical lens 100.

In addition, it is understood that when the optical lens 100 is applied to an electronic device such as a smart phone or a smart tablet, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may be made of plastic, so as to reduce the overall weight of the optical lens 100.

Optionally, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 may all be spherical or aspheric. Certainly, part of the lenses can be set to be spherical surfaces, and part of the lenses can be aspheric surfaces, so that the processing difficulty of the lenses can be reduced by adopting the aspheric surface design, and the surface types of the lenses can be easily controlled.

In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 may be an aperture stop or a field stop, which may be disposed between the object side of the optical lens 100 and the object side S1 of the first lens L1. It is understood that, in other embodiments, the diaphragm 102 may also be disposed between two adjacent lenses, for example, between the fourth lens L4 and the fifth lens L5, and the setting position of the diaphragm 102 may be adjusted according to practical situations, which is not specifically limited in this embodiment.

In some embodiments, the optical lens 100 further includes a filter L6, such as an ir cut filter, disposed between the image-side surface S10 of the fifth lens element L5 and the image plane 101 of the optical lens 100, so as to filter out infrared light and only allow visible light to pass through, thereby avoiding the problem of image distortion caused by infrared light passing through the optical lens.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.6/mm < FNO/ImgH <0.9/mm, where FNO is the f-number of the optical lens 100 and ImgH is the radius of the effective imaging circle of the optical lens 100. Because the optical lens 100 satisfies 0.6/mm < FNO/ImgH <0.9/mm, the optical lens 100 has smaller f-number and larger effective imaging circle radius while realizing the miniaturization design by reasonably controlling the ratio of the f-number to the effective imaging circle radius of the optical lens 100. The light incoming quantity of the optical lens 100 can be improved by setting a smaller f-number, the imaging definition of the optical lens 100 is improved, and particularly the imaging effect of the optical lens 100 in a dark light environment can be enhanced, so that the optical lens 100 can be suitable for shooting in dark light environments such as night scenes, rainy days and starry sky, and the shooting requirement of a customer on the dark light environment is met. In addition, because this optical lens 100 still has great formation of image circle radius to when this optical lens 100 was applied to the module of making a video recording, great effective formation of image circle radius can match the great sensitive chip of photosensitive area, still has the imaging effect of higher pixel when guaranteeing optical lens 100 to satisfy miniaturized design, with the definition that improves the formation of image. When FNO/ImgH is greater than or equal to 0.9/mm, the f-number of the optical lens 100 is too large, the light entering amount is small, and therefore brightness is insufficient, imaging quality is affected, in addition, the effective imaging circle radius of the optical lens 100 is small, and when the optical lens is applied to a camera module, a large-size photosensitive chip is difficult to match, imaging pixels are low, and imaging effect is poor. When FNO/ImgH is less than or equal to 0.6/mm, the f-number of the optical lens 100 is too small, the light incoming amount is too large, and the exposure is too large, thereby affecting the imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.3< ET1/CT1<0.8, where ET1 is a distance in an optical axis direction from a maximum effective aperture of the object-side surface S1 of the first lens L1 to a maximum effective aperture of the image-side surface S2 of the first lens L1, i.e., an edge thickness of the first lens L1, and CT1 is a thickness of the first lens L1 on the optical axis o, i.e., a center thickness of the first lens L1. Since the first lens L1 is closest to the object side and is mainly used for collecting light information from an object space to an image space, by controlling the ratio of the edge thickness to the center thickness of the first lens L1 to be 0.3-0.8, the curvature of the surface shape of the first lens L1 can be effectively controlled, so that the range of light collected by the first lens L1 is more reasonable, that is, the optical lens 100 is controlled to have a reasonable field angle. In addition, the high processing sensitivity of the first lens L1 caused by the fact that the edge thickness of the first lens L1 is too thin relative to the center thickness can be avoided, that is, the processing sensitivity of the first lens L1 can be reduced by controlling the ratio of the edge thickness to the center thickness of the first lens L1 to be 0.3-0.8, so that the production yield of the first lens L1 is improved, and the imaging stability of the optical lens 100 is ensured. When ET1/CT1 is greater than or equal to 0.8, the edge thickness of the first lens element is too large relative to the center thickness, which results in an increase in the effective focal length of the first lens element L1, which is not favorable for collecting the light entering the optical lens 100, and results in a smaller field angle of the optical lens 100. When the ET1/CT1 is less than or equal to 0.3, the edge thickness of the first lens is too small, which results in a difficult processing of the first lens L1 and a difficult production yield of the first lens L1.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.8< ∑ ET/Σ CT <1.2 and 0.8< ET3/CT3<2, where Σ ET is the sum of distances in the optical axis direction from the maximum effective aperture of the object-side surface to the maximum effective aperture of the image-side surface of each lens in the optical lens, that is, the sum of edge thicknesses of each lens of the optical lens 100, Σ CT is the sum of distances in the optical axis direction from the object-side surface to the image-side surface of each lens in the optical lens, ET3 is the distance in the optical axis direction from the maximum effective aperture of the object-side surface to the maximum effective aperture of the image-side surface of the third lens, and CT3 is the thickness of the third lens in the optical axis, that is, the sum of center thicknesses of each lens of the optical lens 100. Because 0.8< ∑ ET/Σ CT <1.2, the proportion of the sum of the edge thicknesses of the five lenses of the optical lens 100 to the sum of the center thickness of the optical lens 100 can be reasonably controlled, which is beneficial to balancing the optical path difference of paraxial rays and marginal rays of the optical lens 100, thereby effectively improving the field curvature and reducing the distortion of the optical lens 100. When the sigma ET/sigma CT is larger than or equal to 1.2, the sum of the edge thicknesses of the five lenses is too large, so that the optical path of edge light is too large compared with the optical path of paraxial light, the field curvature is too large, and the image of the edge field of view is blurred. When Σ ET/Σ CT is less than or equal to 0.8, too small a ratio of the optical path of the marginal ray to the optical path of the paraxial ray also results in too large field curvature, so that the image of the marginal field of view is blurred. Meanwhile, the ratio of the edge thickness to the center thickness of the third lens element L3 can be reasonably controlled because 0.8< ET3/CT3<2, so that the optical path difference between the edge light and the paraxial light of the optical lens 100 can be effectively balanced to correct the field curvature of the optical lens 100. In addition, the processing sensitivity of the third lens L3 can be reduced, so as to reduce the processing difficulty and improve the production yield of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 2< f/f1<3, where f is the effective focal length of the optical lens 100 and f1 is the focal length of the first lens L1. Because 2< f/f1<3, the ratio of the effective focal length of the optical lens 100 to the focal length of the first lens L1 can be reasonably controlled, and the aberration generated by the first lens L1 can be effectively corrected, so that the shooting definition is improved, and the optical lens 100 can be ensured to have low processing sensitivity, so that the processing difficulty of the optical lens 100 is reduced, and the production yield of the optical lens 100 is improved. When f/f1 is greater than or equal to 3, the effective focal length of the first lens L1 is too small, and the light converging capability is too strong, which increases the processing sensitivity of the optical lens 100 and increases the processing difficulty, and the aberration generated by the first lens L1 is difficult to correct, resulting in lower shooting definition. When f/f1 is less than or equal to 2, the effective focal length of the first lens L1 is too large, the light converging capability is insufficient, the light entering the optical lens 100 is not easy to collect, the field angle of the optical lens 100 is small, and it is difficult to correct the aberration generated by the first lens L1, so that the shooting definition is low.

In some embodiments, the optical lens 100 satisfies the following relationship: -2< (R3+ R4)/f2< -0.05, wherein R3 is a radius of curvature of an object side surface S3 of the second lens L2 at the optical axis o, R4 is a radius of curvature of an image side surface S4 of the second lens L2 at the optical axis o, and f2 is a focal length of the second lens L2. Since-2 < (R3+ R4)/f2< -0.05, the curvature radius of the object-side surface S3 and the image-side surface S4 of the second lens L2 at the optical axis o and the focal length of the second lens L2 can be reasonably configured, so that the optical path difference between the marginal ray and the paraxial ray of the optical lens 100 can be balanced, which is beneficial to correcting the curvature of field and astigmatism generated by the first lens L1, and reducing the processing sensitivity of the optical lens 100, thereby improving the production yield of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.5< ImgH FNO/TTL <1.1, where TTL is a distance on the optical axis o from an object-side surface of the first lens element L1 to an image plane of the optical lens 100, that is, a total length of the optical lens 100. Because 0.5< ImgH FNO/TTL <1.1, the effective imaging circle radius of optical lens 100, the total length of optical lens 100, and the ratio of f-number can be reasonably controlled, so that the optical lens 100 can satisfy the miniaturized design of optical lens 100 while having a large imaging surface (i.e., the effective imaging circle radius of optical lens 100) can be ensured, in addition, the amount of light passing through optical lens 100 can also be controlled by controlling the f-number, thereby improving the shooting definition of optical lens 100. When ImgH × FNO/TTL is greater than or equal to 1.1, the optical lens 100 has a large f-number and a small light flux, which may result in too small brightness and affect the imaging quality, and the optical lens 100 has too small total length and is compactly arranged between the lenses, which is not favorable for correcting the aberration of the optical lens 100. When ImgH × FNO/TTL is less than or equal to 0.5, the f-number of the optical lens 100 is small, and the amount of light passing through is too large, resulting in too large exposure, thereby affecting the imaging quality, and meanwhile, the effective imaging circle radius of the optical lens 100 is too small, so that it is difficult to match a large-sized photosensitive chip when applied to a camera module, and it is difficult to realize high-pixel imaging. In addition, the total length of the optical lens 100 is too long, which is not favorable for realizing the miniaturization design of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0< Alt-Agt <0.09mm, where Alt is the longest distance of the air gap between the image-side surface S8 of the fourth lens L4 and the object-side surface S9 of the fifth lens L5 in the direction parallel to the optical axis o, i.e., the largest air gap between the fourth lens L4 and the fifth lens L5, and Agt is the shortest distance of the air gap between the image-side surface S8 of the fourth lens L4 and the object-side surface S9 of the fifth lens L5 in the direction parallel to the optical axis o, i.e., the smallest air gap between the fourth lens L4 and the fifth lens L5. By controlling the difference between the maximum air gap and the minimum air gap between the fourth lens L4 and the fifth lens L5 to be 0-0.09 mm, that is, controlling the difference between the surface shapes of the image-side surface S8 of the fourth lens L4 and the object-side surface S9 of the fifth lens L5 to be smaller, the processing sensitivities of the image-side surface S8 of the fourth lens L4 and the object-side surface S9 of the fifth lens L5 are lower, and the production yield of the optical lens 100 is improved. When Alt-Agt is greater than or equal to 0.09mm, the surface shape difference between the image-side surface S8 of the fourth lens L4 and the object-side surface S9 of the fifth lens L5 is large, which causes the image-side surface S8 of the fourth lens L4 and the object-side surface S9 of the fifth lens L5 to have high processing sensitivity and high processing difficulty, thereby affecting the production yield of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 4< | (R1-R2)/f1| <16, wherein R1 is a radius of curvature of the object-side surface S1 of the first lens L1 at the optical axis o, R2 is a radius of curvature of the image-side surface S2 of the first lens L1 at the optical axis o, and f1 is a focal length of the first lens L1. Since 4< | (R1-R2)/f1| <16, the ratio of the radius of curvature of the object-side surface S1 and the radius of curvature of the image-side surface S2 of the first lens L1 to the focal length of the first lens L1 can be reasonably controlled, so that the optical lens 100 can have a more reasonable field angle. In addition, the surface shapes of the object-side surface S1 and the image-side surface S2 of the first lens element L1 can be effectively controlled, so as to reduce the processing sensitivity of the first lens element L1 and reduce the processing difficulty of the first lens element L1, thereby ensuring that the optical lens 100 has a better production yield. When | (R1+ R2)/f1| ≧ 16, the absolute value of the curvature radius of the image-side surface S2 of the first lens L1 at the optical axis o is too large, which results in the surface being too flat, which reduces the light-gathering capability of the first lens L1, is not favorable for large-angle light to enter the optical lens 100, and is difficult to meet the requirement of the optical lens 100 for the shooting range. When | (R1+ R2)/f1| ≦ 4, the absolute value of the radius of curvature of the image-side surface S2 of the first lens L1 at the optical axis o is too small, resulting in a large degree of surface-form curvature of the image-side surface S2 of the first lens L1, which increases the processing difficulty.

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

First embodiment

As shown in fig. 1, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6, which are disposed in order from an object side to an image side along an optical axis o. For the materials of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5, reference may be made to the above-mentioned embodiments, and further description thereof is omitted here.

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

Furthermore, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the paraxial region o, and the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the circumference. The object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the paraxial region o, respectively, and the object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the circumference, respectively. The object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the paraxial region o, respectively, and the object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the circumference. The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex at the paraxial region o, and the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex and concave at the circumference. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are both concave at the paraxial region o, and the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are both convex at the circumference.

Specifically, other parameters of the optical lens 100 are given in table 1 below, taking as examples that the effective focal length f of the optical lens 100 is 16.84mm, the aperture size FNO of the optical lens 100 is 3.5, the field angle FOV of the optical lens 100 is 26.8deg, and the total optical length TTL of the optical lens 100 is 15.2 mm. The elements of the optical lens 100 from the object side to the image side along the optical axis o are arranged in the order of the elements from top to bottom in table 1. In the same lens, the surface with the smaller surface number is the object side surface of the lens, and the surface with the larger surface number is the image side surface of the lens, and for example, the

surface numbers

1 and 2 correspond to the object side surface S1 and the image side surface S2 of the first lens L1, respectively. The Y radius in table 1 is the radius of curvature of the object-side or image-side surface of the respective surface number at the paraxial region o. The first value in the "thickness" parameter set of a lens is the thickness of the lens on the optical axis o, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis o. The numerical value of the stop 102 in the "thickness" parameter column is the distance from the stop 102 to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis o) on the optical axis o, the direction from the object-side surface S1 of the first lens L1 to the image-side surface of the last lens is the positive direction of the optical axis o, when the value is negative, it indicates that the stop 102 is disposed on the right side of the vertex of the next surface, and if the thickness of the stop 102 is a positive value, the stop 102 is disposed on the left side of the vertex of the next surface. It is understood that the units of the radius Y, thickness, and focal length in table 1 are all mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 1 was 587.6 nm.

TABLE 1

In the first embodiment, the object-side surface and the image-side surface of the first lens L1 through the fifth lens L5 are aspheric, and the aspheric surface x can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis o direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius R of Y in table 1 above); k is a conic coefficient; ai is a correction coefficient corresponding to the high-order term of the ith aspheric term. Table 2 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the respective aspherical mirror surfaces S1-S10 in the first embodiment.

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows a light spherical aberration curve of the optical lens 100 in the first embodiment at 470nm, 510nm, 587nm, 610nm and 650 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 2 (B), fig. 2 (B) is a diagram of astigmatism of light of the optical lens 100 in the first embodiment at a wavelength of 587 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and it can be seen from (B) in fig. 2 that the astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 2 (C), fig. 2 (C) is a distortion curve diagram of the optical lens 100 in the first embodiment at a wavelength of 587 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. As can be seen from (C) in fig. 2, the distortion of the optical lens 100 can be corrected at a wavelength of 587 nm.

Second embodiment

Referring to fig. 3, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6, which are disposed in order from an object side to an image side along an optical axis o. For the materials of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5, reference may be made to the above-mentioned embodiments, and further description thereof is omitted here.

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

Furthermore, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the paraxial region o, and the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the circumference. The object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex at the paraxial region o, and the object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the circumference. The object-side surface S5 and the image-side surface S6 of the third lens element L3 are both concave at the paraxial region o, and the object-side surface S5 and the image-side surface S6 of the third lens element L3 are respectively convex and concave at the circumference. The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave and convex at the paraxial region o, respectively, and the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are both concave at the circumference. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are concave and convex at the paraxial region o, respectively, and the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are convex and concave at the circumference.

In the second embodiment, the effective focal length f of the optical lens 100 is 14.27mm, the aperture size FNO of the optical lens 100 is 3.0, the FOV of the field angle of the optical lens 100 is 29.68deg, and the total optical length TTL of the optical lens 100 is 14.36 mm.

Other parameters in the second embodiment are given in the following table 3, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 3 are all mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 3 was 587.6 nm.

TABLE 3

In the second embodiment, table 4 gives the high-order term coefficients that can be used for each aspherical surface in the second embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

TABLE 4

Referring to fig. 4 (a), fig. 4 (a) shows a light spherical aberration curve of the optical lens 100 in the second embodiment at wavelengths of 470nm, 510nm, 587nm, 610nm and 650 nm. In fig. 4 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from (a) in fig. 4, the spherical aberration value of the optical lens 100 in the second embodiment is better, which illustrates that the imaging quality of the optical lens 100 in the present embodiment is better.

Referring to fig. 4 (B), fig. 4 (B) is a diagram of astigmatism of light of the optical lens 100 in the second embodiment at a wavelength of 587 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and it can be seen from (B) in fig. 4 that astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 4 (C), fig. 4 (C) is a distortion curve diagram of the optical lens 100 in the second embodiment at a wavelength of 587 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. As can be seen from (C) in fig. 4, the distortion of the optical lens 100 can be corrected at a wavelength of 587 nm.

Third embodiment

Referring to fig. 5, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6, which are disposed in order from an object side to an image side along an optical axis o. For the materials of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5, reference may be made to the above-mentioned embodiments, and further description thereof is omitted here.

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

Furthermore, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex and concave at the paraxial region o, respectively, and the object-side surface S1 and the image-side surface S2 of the first lens element L1 are both convex at the circumference. The object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the paraxial region o, respectively, and the object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the circumference. The object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the paraxial region o, respectively, and the object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the circumference. The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex at the paraxial region o, and the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex at the circumference. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are convex and concave at the paraxial region o, respectively, and the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are both convex at the circumference.

In the third embodiment, the effective focal length f of the optical lens 100 is 15.8mm, the aperture size FNO of the optical lens 100 is 3.20, the field angle FOV of the optical lens 100 is 29.89deg, and the total optical length TTL of the optical lens 100 is 14.82 mm.

Other parameters in the third embodiment are shown in the following table 5, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 5 are mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 5 was 587.6 nm.

TABLE 5

In the third embodiment, table 6 gives the high-order term coefficients that can be used for each aspherical surface in the third embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

TABLE 6

Referring to fig. 6 (a), fig. 6 (a) shows a light spherical aberration curve of the optical lens 100 in the third embodiment at wavelengths of 470nm, 510nm, 587nm, 610nm and 650 nm. In fig. 6 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from (a) in fig. 6, the spherical aberration value of the optical lens 100 in the third embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 6 (B), fig. 6 (B) is a diagram of astigmatism of light of the optical lens 100 in the third embodiment at a wavelength of 587 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and it can be seen from (B) in fig. 6 that astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 6 (C), fig. 6 (C) is a distortion curve diagram of the optical lens 100 in the third embodiment at a wavelength of 587 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. As can be seen from (C) in fig. 6, the distortion of the optical lens 100 can be corrected at a wavelength of 587 nm.

Fourth embodiment

Referring to fig. 7, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6, which are sequentially disposed from an object side to an image side along an optical axis o. For the materials of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5, reference may be made to the above-mentioned embodiments, and further description thereof is omitted here.

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

Furthermore, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex and concave at the paraxial region o, respectively, and the object-side surface S1 and the image-side surface S2 of the first lens element L1 are both convex at the circumference. The object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the paraxial region o, respectively, and the object-side surface S3 and the image-side surface S4 of the second lens element L2 are both concave at the circumference. The object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex at the paraxial region o, and the object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex at the circumference. The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave and convex at the paraxial region o, respectively, and the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are both concave at the circumference. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are respectively convex and concave at the paraxial region o, and the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are respectively concave and convex at the circumference.

In the fourth embodiment, the effective focal length f of the optical lens 100 is 14.40mm, the aperture size FNO of the optical lens 100 is 2.80, the field angle FOV of the optical lens 100 is 29.95deg, and the total optical length TTL of the optical lens 100 is 14.31mm, for example.

Other parameters in the fourth embodiment are shown in the following table 7, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 7 are mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 7 was 587.6 nm.

TABLE 7

In the fourth embodiment, table 8 gives the high-order term coefficients that can be used for each aspherical surface in the fourth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

TABLE 8

Referring to fig. 8 (a), fig. 8 (a) shows a light spherical aberration curve of the optical lens 100 in the fourth embodiment at wavelengths of 470nm, 510nm, 587nm, 610nm and 650 nm. In fig. 8 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from (a) in fig. 8, the spherical aberration value of the optical lens 100 in the fourth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 8 (B), fig. 8 (B) is a diagram of astigmatism of light of the optical lens 100 in the fourth embodiment at a wavelength of 587 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and it can be seen from (B) in fig. 8 that astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 8 (C), fig. 8 (C) is a distortion curve diagram of the optical lens 100 in the fourth embodiment at a wavelength 587. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. As can be seen from (C) in fig. 8, the distortion of the optical lens 100 can be corrected at the wavelength 587.

Fifth embodiment

Referring to fig. 9, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter L6, which are disposed in order from an object side to an image side along an optical axis o. For the materials of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5, reference may be made to the above-mentioned embodiments, and further description thereof is omitted here.

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

Furthermore, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the paraxial region o, and the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the circumference. The object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the paraxial region o, respectively, and the object-side surface S3 and the image-side surface S4 of the second lens element L2 are convex and concave at the circumference. The object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the paraxial region o, respectively, and the object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave at the circumference. The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave and convex at the paraxial region o, respectively, and the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex and concave at the circumference. The object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are both concave at the paraxial region o, and the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are respectively convex and concave at the circumference.

In the fifth embodiment, the effective focal length f of the optical lens 100 is 16.17mm, the aperture size FNO of the optical lens 100 is 3.5, the field angle FOV of the optical lens 100 is 26.75deg, and the total optical length TTL of the optical lens 100 is 14.28 mm.

The other parameters in the fifth embodiment are shown in the following table 9, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 9 are mm. And the reference wavelength of refractive index, abbe number, focal length of each lens in table 9 was 587.6 nm.

TABLE 9

In the fifth embodiment, table 10 gives the high-order term coefficients that can be used for each aspherical surface in the fifth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Watch 10

Referring to fig. 10 (a), fig. 10 (a) shows a light spherical aberration curve of the optical lens 100 in the fifth embodiment at wavelengths of 470nm, 510nm, 587nm, 610nm and 650 nm. In fig. 10 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from (a) in fig. 10, the spherical aberration value of the optical lens 100 in the fifth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.

Referring to fig. 10 (B), fig. 10 (B) is a diagram of astigmatism of light of the optical lens 100 in the fifth embodiment at a wavelength of 587 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and it can be seen from (B) in fig. 10 that astigmatism of the optical lens 100 is well compensated at this wavelength.

Referring to fig. 10 (C), fig. 10 (C) is a distortion curve diagram of the optical lens 100 in the fifth embodiment at a wavelength of 587 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. As can be seen from (C) in fig. 10, the distortion of the optical lens 100 can be corrected at a wavelength of 587 nm.

Referring to table 11, table 11 summarizes ratios of the relations in the first embodiment to the fifth embodiment of the present application.

TABLE 11

Referring to fig. 11, the present application further discloses a camera module 200, which includes a photo sensor 201 and the optical lens 100 according to any of the first to fifth embodiments, wherein the photo sensor 201 is disposed at an image side of the optical lens 100. The optical lens 100 may be configured to receive a light signal of a subject and project the light signal to the light sensing chip 201, and the light sensing chip 201 may be configured to convert the light signal corresponding to the subject into an image signal. And will not be described in detail herein.

It can be understood that the camera module 200 having the optical lens 100 has all the technical effects of the optical lens 100, that is, the optical lens 100 reasonably controls the ratio of the f-number to the effective imaging circle radius of the optical lens, so as to ensure that the optical lens 100 has a larger f-number and a larger effective imaging circle radius while realizing a miniaturized design, thereby improving the light incident amount of the optical lens 100, improving the imaging definition of the optical lens 100, especially enhancing the imaging effect of the optical lens 100 in a dark light environment, so that the optical lens 100 can be suitable for shooting in dark light environments such as night scenes, rainy days, starry sky, and the like, and meet the shooting requirements of customers on the dark light environments. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again. In some embodiments, the optical lens 100 further includes a prism 202, which may be a right-angle prism, and the prism 202 is located between the object side of the optical lens 100 and the object side S1 of the first lens L1. The prism 202 includes an incident surface S21, a reflecting surface S22, and an exit surface S23, and the exit surface S23 is disposed toward the image side surface S1 of the first lens L1. The light enters the prism 202 from the incident surface S21 of the prism 202, is reflected by the reflecting surface S22, exits from the exit surface S23 of the prism 202, and enters the first lens L1.

By additionally providing the prism 202 between the object side of the optical lens 100 and the first lens L1, the overall length of the optical lens can be reduced while the requirements for a large effective focal length and a small field angle are met, and the optical lens can be designed in a compact size. Referring to fig. 12, the present application further discloses an electronic device, where the electronic device 300 includes a housing 301 and the camera module 200 as described above, and the camera module 200 is disposed on the housing 301 to obtain image information. The electronic device 300 may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, and the like. It can be understood that the electronic device 300 having the camera module 200 also has all the technical effects of the optical lens 100. That is, the optical lens 100 of the electronic device 300 can achieve a miniaturized design and also has a larger f-number and a larger effective imaging circle radius, so as to improve the imaging definition of the optical lens 100, and especially, can enhance the imaging effect of the optical lens 100 in a dark light environment, so that the optical lens 100 can be suitable for shooting in dark light environments such as night scenes, rainy days, starry sky, and the like, so as to meet the shooting requirements of customers for the dark light environment. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.

The optical lens, the camera module, the electronic device and the automobile disclosed by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the embodiment of the invention, and the description of the embodiment is only used for helping to understand the optical lens, the camera module, the electronic device and the automobile and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

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

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

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

the third lens element with refractive power;

the fourth lens element with refractive power has a convex image-side surface at paraxial region;

the fifth lens element with refractive power;

the optical lens satisfies the following relation: 0.6/mm < FNO/ImgH < 0.9/mm;

and the FNO is the f-number of the optical lens, and the ImgH is the radius of an effective imaging circle of the optical lens.

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

0.3<ET1/CT1<0.8；

ET1 is a distance in an optical axis direction from a maximum effective aperture of an object-side surface of the first lens element to a maximum effective aperture of an image-side surface of the first lens element, and CT1 is a thickness of the first lens element on the optical axis.

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

0.8< ∑ ET/Σ CT <1.2 and 0.8< ET3/CT3< 2;

Σ ET is a sum of distances in an optical axis direction from a maximum effective aperture position of an object side surface of each lens in the optical lens to a maximum effective aperture position of an image side surface, Σ CT is a sum of distances in an optical axis direction from an object side surface to an image side surface of each lens in the optical lens, ET3 is a distance in the optical axis direction from a maximum effective aperture position of an object side surface of the third lens to a maximum effective aperture position of an image side surface of the third lens, and CT3 is a thickness of the third lens in the optical axis direction.

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

2<f/f1<3；

wherein f is an effective focal length of the optical lens, and f1 is a focal length of the first lens.

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

-2<(R3+R4)/f2<-0.05；

wherein R3 is a radius of curvature of an object-side surface of the second lens at the optical axis, R4 is a radius of curvature of an image-side surface of the second lens at the optical axis, and f2 is a focal length of the second lens.

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

0.5<ImgH*FNO/TTL<1.1；

wherein, TTL is a distance on the optical axis from the object-side surface of the first lens element to the image plane of the optical lens.

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

0<Alt-Agt<0.09mm；

the third lens element comprises a fourth lens element, a fifth lens element, an air gap, an att and an Agt, wherein the att is the longest distance of the air gap between the image side surface of the fourth lens element and the object side surface of the fifth lens element in the direction parallel to the optical axis, and the att is the shortest distance of the air gap between the image side surface of the fourth lens element and the object side surface of the fifth lens element in the direction parallel to the optical axis.

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

4<|(R1-R2)/f1|<16；

wherein R1 is a radius of curvature of an object-side surface of the first lens at the optical axis, R2 is a radius of curvature of an image-side surface of the first lens at the optical axis, and f1 is a focal length of the first lens.

9. A camera module, comprising a photo sensor chip and the optical lens of any one of claims 1-8, wherein the photo sensor chip is disposed on an image side of the optical lens.

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