CN113433674A

CN113433674A - Optical lens and imaging apparatus

Info

Publication number: CN113433674A
Application number: CN202110985041.0A
Authority: CN
Inventors: 曾昊杰; 于笑枝; 曾吉勇
Original assignee: Jiangxi Lianyi Optics Co Ltd
Current assignee: Jiangxi Lianyi Optics Co Ltd
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2021-09-24
Anticipated expiration: 2041-08-26
Also published as: CN113433674B

Abstract

The invention discloses an optical lens and imaging equipment, the optical lens includes from the object side to the imaging surface along the optical axis in turn: a diaphragm; a first lens element having a positive optical power, the object-side surface of which is convex and the image-side surface of which is convex or concave at the paraxial region; a second lens with negative focal power, wherein the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a third lens element having a negative power, wherein the object-side surface of the third lens element is concave and the image-side surface of the third lens element is convex at a paraxial region; a fourth lens with positive focal power, wherein the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; a fifth lens element with negative optical power, having a concave object-side surface at paraxial region and a convex image-side surface; the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspheric lenses. The optical lens at least has the advantages of high pixel and long focal length.

Description

Optical lens and imaging apparatus

Technical Field

The present invention relates to the field of imaging lens technology, and in particular, to an optical lens and an imaging device.

Background

At present, along with the popularization of portable electronic devices (such as smart phones and cameras) and the popularity of social, video and live broadcast software, people have higher and higher liking degree for photography, camera lenses become standard preparations of the electronic devices, and the camera lenses even become indexes which are considered primarily when consumers purchase the electronic devices.

With the continuous development of mobile information technology, portable electronic devices such as mobile phones are also developing in the directions of being light and thin, full-screen, ultra-high-definition imaging, and the like, which puts higher demands on camera lenses mounted on the portable electronic devices. Although the conventional five-lens optical lens has good optical performance, the use requirement of long-focus and high-pixel cannot be well met.

Disclosure of Invention

Therefore, an object of the present invention is to provide an optical lens and an imaging apparatus, which have at least the advantages of high pixel and long focal length.

The embodiment of the invention implements the above object by the following technical scheme.

In a first aspect, the present invention provides an optical lens, comprising, in order from an object side to an image plane along an optical axis: a diaphragm; a first lens having a positive optical power, the first lens having a convex object-side surface and a convex or concave image-side surface at a paraxial region; the second lens with negative focal power is characterized in that the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a third lens element having a negative optical power, the third lens element having a concave object-side surface and a convex image-side surface at a paraxial region; the fourth lens is provided with positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; a fifth lens element having a negative optical power, an object-side surface of the fifth lens element being concave at a paraxial region and an image-side surface of the fifth lens element being convex; wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspheric lenses.

In a second aspect, the present invention provides an imaging apparatus, comprising an imaging element and the optical lens provided in the first aspect, wherein the imaging element is configured to convert an optical image formed by the optical lens into an electrical signal.

Compared with the prior art, the optical lens and the imaging equipment provided by the invention adopt five lenses with specific refractive power, and adopt specific surface shape collocation and reasonable focal power distribution, so that the structure is more compact while high pixel is met, and the balance between the long focal length of the lens and the high pixel is better realized.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

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

FIG. 2 is a astigmatic chart of an optical lens according to a first embodiment of the present invention;

FIG. 3 is a graph showing the f-tan θ distortion of the optical lens according to the first embodiment of the present invention;

FIG. 4 is a vertical axis chromatic aberration diagram of an optical lens according to a first embodiment of the present invention;

FIG. 5 is a graph illustrating an axial chromatic aberration of an optical lens according to a first embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an optical lens system according to a second embodiment of the present invention;

FIG. 7 is an astigmatism graph of an optical lens according to a second embodiment of the present invention;

FIG. 8 is a graph showing the f-tan θ distortion of an optical lens according to a second embodiment of the present invention;

FIG. 9 is a vertical axis chromatic aberration diagram of an optical lens according to a second embodiment of the present invention;

FIG. 10 is a graph illustrating axial chromatic aberration of an optical lens according to a second embodiment of the present invention;

FIG. 11 is a schematic structural diagram of an optical lens assembly according to a third embodiment of the present invention;

FIG. 12 is a astigmatic chart of an optical lens according to a third embodiment of the present invention;

FIG. 13 is a graph showing the f-tan θ distortion of an optical lens according to a third embodiment of the present invention;

FIG. 14 is a vertical axis chromatic aberration diagram of an optical lens according to a third embodiment of the present invention;

FIG. 15 is a graph illustrating axial chromatic aberration of an optical lens according to a third embodiment of the present invention;

fig. 16 is a schematic configuration diagram of an image forming apparatus according to a fourth embodiment of the present invention.

Detailed Description

In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.

The present invention provides an optical lens, sequentially including, from an object side to an image plane along an optical axis: the lens comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and an optical filter.

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

the second lens has negative focal power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave;

the third lens has negative focal power, the object-side surface of the third lens is a concave surface, and the image-side surface of the third lens is a convex surface at a paraxial region;

the fourth lens has positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;

the fifth lens element has a negative optical power, and has a concave object-side surface at a paraxial region and a convex image-side surface.

In some embodiments, the optical lens satisfies the following conditional expression:

0.1<R5/R6<1；（1）

0.1<R5/f3<0.6；（2）

where f3 denotes a focal length of the third lens, R5 denotes a radius of curvature of an object-side surface of the third lens, and R6 denotes a radius of curvature of an image-side surface of the third lens. The third lens has proper negative focal power and the object side surface and the image side surface of the third lens have the same-direction curvature radius when the conditional expressions (1) and (2) are met, so that the field curvature can be corrected, and the resolution quality of the optical lens is improved.

0.085/mm<tan(HFOV)/f<0.087/mm；（3）

1.0<TTL/f<1.05；（4）

2.4<TTL/IH<2.5；（5）

wherein, HFOV represents the maximum half field angle of the optical lens, f represents the effective focal length of the optical lens, TTL represents the total optical length of the optical lens, and IH represents the image height corresponding to the maximum half field angle of the optical lens. The condition formula (3) is satisfied, the lens has a larger focal length and a smaller field angle, the long-focus macro imaging effect is realized, and meanwhile, the optical distortion of the lens can be effectively corrected. The conditional expressions (4) and (5) are satisfied, the effective focal length of the optical lens can be reasonably controlled, and the long focal length and the high pixel balance can be favorably realized.

0.15mm<SAG22/tan(θ4)<0.3mm；（6）

where SAG22 denotes an edge rise of the image side surface of the second lens, and θ 4 denotes a maximum surface inclination angle of the image side surface of the second lens. The surface type of the image side surface of the second lens can be reasonably controlled by satisfying the conditional expression (6), thereby being beneficial to reducing the generation of ghost images or reducing the energy of the ghost images, simultaneously being beneficial to reducing the sensitivity of the system and improving the production yield of the optical lens.

0.2<SAG31/SAG41<0.35；（7）

where SAG31 represents the edge rise of the object-side surface of the third lens and SAG41 represents the edge rise of the object-side surface of the fourth lens. The condition formula (7) is met, and the object side surface types of the third lens and the fourth lens are reasonably matched, so that the aberration of an off-axis field and a central field can be corrected, and the resolution quality of the optical lens is improved.

-0.45<R7/f4<-0.05；（8）

0.8<tan(θ7)<1.1；（9）

0.85<R7/R8<1.65；（10）

where R7 denotes a radius of curvature of the object side surface of the fourth lens, f4 denotes a focal length of the fourth lens, and θ 7 denotes a maximum surface inclination angle of the object side surface of the fourth lens. The optical lens meets the conditional expressions (8) and (9), and the surface type of the object side surface of the fourth lens is reasonably controlled, so that the light has a smaller incident angle when entering the object side surface of the fourth lens, the distortion of an off-axis field of view is favorably corrected, and the resolution quality of the optical lens is improved. The conditional expression (10) is satisfied, the surface shape of the fourth lens can be reasonably limited, the processing type of the lens is improved, and the processing yield is effectively improved.

1.1<CT4/ET4 <1.7；（11）

0.12<CT4/TTL <0.16；（12）

wherein CT4 denotes a center thickness of the fourth lens, ET4 denotes an edge thickness of the fourth lens, and TTL denotes an optical total length of the optical lens. The surface type of the fourth lens can be reasonably controlled to be a uniform meniscus shape so as to be beneficial to correcting aberration and improve the resolution quality of the optical lens.

-0.35<f1/f5<0；（13）

-0.25<SAG51/DM9<-0.05；（14）

where f1 denotes the focal length of the first lens, f5 denotes the focal length of the fifth lens, SAG51 denotes the edge rise of the object-side surface of the fifth lens, and DM9 denotes the effective aperture of the object-side surface of the fifth lens. The ratio of the focal power of the first lens to that of the fifth lens can be reasonably controlled when the conditional expression (13) is met, and the optical lens is favorable for realizing a longer effective focal length; meanwhile, the conditional expression (14) is satisfied, and the relative illumination of the optical lens is favorably improved by reasonably controlling the surface type of the object side surface of the fifth lens.

1.7<CT5/ET5 <2.0；（15）

0.16<CT5/TTL <0.2；（16）

wherein CT5 denotes a center thickness of the fifth lens, ET5 denotes an edge thickness of the fifth lens, and TTL denotes an optical total length of the optical lens. The thickness ratio of the fifth lens can be reasonably controlled by satisfying the conditional expressions (15) and (16), the processing and forming of the lens can be favorably improved, meanwhile, the fifth lens can have larger central thickness, and the optical lens has longer focal length.

0.12<AT34/TC34 <0.17；（17）

1.0<AT45/TC45 <5.0；（18）

0.22<∑TC/∑CT<0.42；（19）

where TC34 denotes a distance between the third lens and the fourth lens on the optical axis, TC45 denotes a distance between the fourth lens and the fifth lens on the optical axis, AT34 denotes a distance between an image-side surface of the third lens and an object-side surface of the fourth lens AT the effective aperture, AT45 denotes a distance between the image-side surface of the fourth lens and the object-side surface of the fifth lens AT the effective aperture, Σ TC denotes a sum of air spaces on the optical axis of each of the adjacent two lenses of the first lens to the fifth lens, and Σ CT denotes a sum of center thicknesses of each of the lenses of the first lens to the fifth lens on the optical axis. The central thickness of each lens and the air interval between each adjacent lens can be reasonably distributed by satisfying the conditional expressions (17), (18) and (19), thereby being beneficial to the compactness of the system structure and realizing the miniaturization of the lens; meanwhile, the sensitivity of the optical lens is favorably reduced, and the production yield of the optical lens is improved.

In some embodiments, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all aspheric lenses.

The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to in the parameter tables of the various embodiments. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.

The surface shape of the aspheric lens in each embodiment of the invention satisfies the following equation:

；

wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height h along the optical axis direction, c is the paraxial curvature of the surface, k is the quadric coefficient, A_2iIs the aspheric surface type coefficient of 2i order.

First embodiment

Referring to fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention is shown, where the optical lens 100 sequentially includes, from an object side to an image plane along an optical axis: the lens includes a stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter G1.

The first lens L1 has positive optical power, the first lens has a convex object-side surface S1, and a concave image-side surface S2 at the paraxial region;

the second lens L2 has negative focal power, the object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave;

the third lens L3 has negative power, the object-side surface S5 of the third lens is concave, and the image-side surface S6 of the third lens is convex at the paraxial region;

the fourth lens L4 has positive focal power, the object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is convex;

the fifth lens L5 has negative power, and the object-side surface S9 of the fifth lens is concave at the paraxial region and the image-side surface S10 of the fifth lens is convex.

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 are all plastic aspheric lenses; in other embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may also be a combination of plastic lenses and glass lenses.

The parameters related to each lens in the optical lens 100 provided in this embodiment are shown in table 1.

TABLE 1

The surface shape coefficients of the aspherical surfaces of the optical lens 100 in the present embodiment are shown in table 2.

TABLE 2

In the present embodiment, graphs of the astigmatism curve, the f-tan θ distortion, the vertical axis chromatic aberration, and the axial chromatic aberration of the optical lens 100 are shown in fig. 2, 3, 4, and 5, respectively.

The astigmatism curve of fig. 2 indicates the degree of curvature of the meridional image plane and the sagittal image plane. In fig. 2, the horizontal axis represents the offset amount (unit: mm) and the vertical axis represents the angle of view (unit: degree). As can be seen from fig. 2, astigmatism in the meridional direction and the sagittal direction is controlled to be within ± 0.02mm, which indicates that the astigmatism correction of the optical lens 100 is good.

The distortion curve of fig. 3 represents the f-tan θ distortion at different image heights on the image plane. In fig. 3, the horizontal axis represents the distortion percentage of f-tan θ, and the vertical axis represents the angle of view (unit: degree). It can be seen from the figure that the optical distortion of the lens is controlled within 1.6%, which indicates that the distortion of the optical lens 100 is well corrected.

The vertical axis chromatic aberration curve of fig. 4 shows chromatic aberration at different image heights on the image plane for each wavelength with respect to the center wavelength (0.555 μm). In fig. 4, the horizontal axis represents the homeotropic color difference (unit: μm) of each wavelength with respect to the center wavelength, and the vertical axis represents the normalized angle of view. As can be seen from fig. 4, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 1.1 μm, which indicates that the optical lens 100 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.

The axial chromatic aberration curve of fig. 5 represents the aberration on the optical axis at the imaging plane. In fig. 5, the vertical axis represents the axial chromatic difference value (unit: mm), and the horizontal axis represents the normalized pupil radius. As can be seen from fig. 5, the offset of the axial chromatic aberration is controlled within ± 0.04mm, which indicates that the optical lens 100 can effectively correct the axial chromatic aberration.

Second embodiment

Referring to fig. 6, which is a schematic structural diagram of an optical lens 200 according to the present embodiment, an optical lens 200 according to a second embodiment of the present invention has a structure substantially the same as that of the optical lens 100 according to the first embodiment, except that an image-side surface S2 of the first lens element is convex at a paraxial region, and curvature radii, thicknesses, and material choices of the respective lens elements are different.

Specifically, the parameters related to each lens in the optical lens 200 provided in the present embodiment are shown in table 3.

TABLE 3

The surface shape coefficients of the aspherical surfaces of the optical lens 200 in the present embodiment are shown in table 4.

TABLE 4

In the present embodiment, graphs of an astigmatism curve, optical distortion, vertical axis chromatic aberration, and axial chromatic aberration of the optical lens 200 are shown in fig. 7, 8, 9, and 10, respectively.

The astigmatism curve of fig. 7 indicates the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 7, astigmatism in the meridional direction and the sagittal direction is controlled to be within ± 0.04mm, which indicates that the astigmatism correction of the optical lens 200 is good.

The distortion curve of fig. 8 represents the f-tan θ distortion at different image heights on the image plane. As can be seen from fig. 8, the optical distortion of the lens is controlled to be within 1.3%, indicating that the distortion of the optical lens 200 is well corrected.

The vertical axis chromatic aberration curve of fig. 9 shows chromatic aberration at different image heights on the image forming surface for each wavelength with respect to the center wavelength (0.555 μm). As can be seen from fig. 9, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 1.0 μm, which indicates that the optical lens 200 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.

The axial chromatic aberration curve of fig. 10 represents the aberration on the optical axis at the imaging plane. As can be seen from fig. 10, the offset of the axial chromatic aberration is controlled within ± 0.035mm, which indicates that the optical lens 200 can effectively correct the axial chromatic aberration.

Third embodiment

Referring to fig. 11, which is a schematic structural diagram of an optical lens 300 according to the present embodiment, an optical lens 300 according to a third embodiment of the present invention has a structure substantially the same as that of the optical lens 100 according to the first embodiment, except that curvature radii, thicknesses, and material selections of the lenses are different.

The parameters related to each lens of the optical lens 300 provided in this embodiment are shown in table 5.

TABLE 5

The surface shape coefficients of the aspherical surfaces of the optical lens 300 in the present embodiment are shown in table 6.

TABLE 6

In the present embodiment, graphs of an astigmatism curve, optical distortion, vertical axis chromatic aberration, and axial chromatic aberration of the optical lens 300 are shown in fig. 12, 13, 14, and 15, respectively.

The astigmatism curve in fig. 12 indicates the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 12, astigmatism in the meridional direction and the sagittal direction is controlled to be within ± 0.025mm, which indicates that the astigmatism correction of the optical lens 300 is good.

The distortion curve of fig. 13 represents f-tan θ distortion at different image heights on the image plane. As can be seen from fig. 13, the optical distortion is controlled to be within 1.3%, indicating that the distortion of the optical lens 300 is well corrected.

The vertical axis chromatic aberration curve in fig. 14 shows chromatic aberration at different image heights on the image forming surface for each wavelength with respect to the center wavelength (0.555 μm). As can be seen from fig. 14, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 1.3 μm, which indicates that the optical lens 300 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.

The axial chromatic aberration curve of fig. 15 represents the aberration on the optical axis at the imaging plane. As can be seen from fig. 15, the offset of the axial chromatic aberration is controlled within ± 0.025mm, which indicates that the optical lens 300 can effectively correct the axial chromatic aberration.

Table 7 shows the optical characteristics corresponding to the above three embodiments, which mainly include the effective focal length F, F #, total optical length TTL, and field angle 2 θ of the system, the image height IH corresponding to the maximum half field, and the values corresponding to each of the above conditional expressions.

TABLE 7

In summary, the optical lens provided by the embodiment of the invention has the following advantages:

(1) the optical lens provided by the invention has the advantages that the diaphragm and each lens are reasonably arranged, so that the total length of the lens is smaller (TTL is less than 5 mm), the focal length of the lens is longer, the field angle is smaller, the long-focus microspur imaging effect can be realized, and the design requirements of the long focal length and the volume miniaturization are well balanced.

(2) The optical lens provided by the invention adopts five aspheric lenses with specific refractive power, and the lens has higher pixels and longer focal length through specific surface shape matching, so that high-definition imaging of distant scenes can be realized.

(3) The optical lens provided by the invention can adopt the all-plastic aspheric lens, so that the volume of the system can be reduced, and the production cost of the lens can be effectively reduced.

Fourth embodiment

Referring to fig. 16, an imaging device 400 according to a fourth embodiment of the present invention is shown, where the imaging device 400 may include an imaging element 410 and an optical lens (e.g., the optical lens 100) in any of the embodiments described above. The imaging element 410 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.

The imaging device 400 may be a mobile phone, a camera, a tablet computer, or any other electronic device with the optical lens mounted thereon.

The imaging device 400 provided by the embodiment of the application includes the optical lens 100, and since the optical lens 100 has the advantages of high pixel and long focal length, the imaging device 400 having the optical lens 100 also has the advantages of high pixel and long focal length.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An optical lens, comprising, in order from an object side to an image plane along an optical axis:

a diaphragm;

a first lens having a positive optical power, the first lens having a convex object-side surface and a convex or concave image-side surface at a paraxial region;

the second lens with negative focal power is characterized in that the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

a third lens element having a negative optical power, the third lens element having a concave object-side surface and a convex image-side surface at a paraxial region;

the fourth lens is provided with positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;

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

wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspheric lenses.

2. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:

0.1<R5/R6<1；

0.1<R5/f3<0.6；

where f3 denotes a focal length of the third lens, R5 denotes a radius of curvature of an object side surface of the third lens, and R6 denotes a radius of curvature of an image side surface of the third lens.

3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:

0.085/mm<tan(HFOV)/f<0.087/mm；

1.0<TTL/f<1.05；

2.4<TTL/IH<2.5；

wherein, HFOV represents the maximum half field angle of the optical lens, f represents the effective focal length of the optical lens, TTL represents the total optical length of the optical lens, and IH represents the image height corresponding to the maximum half field angle of the optical lens.

4. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:

0.15mm<SAG22/tan(θ4)<0.3mm；

wherein SAG22 represents an edge rise of an image side surface of the second lens, and θ 4 represents a maximum surface inclination angle of the image side surface of the second lens.

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

0.2<SAG31/SAG41<0.35；

wherein SAG31 represents the edge rise of the object side of the third lens and SAG41 represents the edge rise of the object side of the fourth lens.

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

-0.45<R7/f4<-0.05；

0.85<R7/R8<1.65；

0.8<tan(θ7)<1.1；

wherein R7 denotes a radius of curvature of an object side surface of the fourth lens, R8 denotes a radius of curvature of an image side surface of the fourth lens, f4 denotes a focal length of the fourth lens, and θ 7 denotes a maximum surface inclination angle of the object side surface of the fourth lens.

7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:

1.1<CT4/ET4 <1.7；

0.12<CT4/TTL <0.16；

wherein CT4 denotes a center thickness of the fourth lens, ET4 denotes an edge thickness of the fourth lens, and TTL denotes an optical total length of the optical lens.

8. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:

-0.35<f1/f5<0；

-0.25<SAG51/DM9<-0.05；

wherein f1 denotes a focal length of the first lens, f5 denotes a focal length of the fifth lens, SAG51 denotes an edge rise of an object side surface of the fifth lens, and DM9 denotes an effective aperture of the object side surface of the fifth lens.

9. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:

1.7<CT5/ET5 <2.0；

0.16<CT5/TTL <0.2；

wherein CT5 denotes a center thickness of the fifth lens on an optical axis, ET5 denotes an edge thickness of the fifth lens, and TTL denotes an optical total length of the optical lens.

10. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:

0.12<AT34/TC34 <0.17；

1.0<AT45/TC45 <5.0；

0.22<∑TC/∑CT<0.42；

wherein TC34 represents a distance between the third lens and the fourth lens on an optical axis, TC45 represents a distance between the fourth lens and the fifth lens on the optical axis, AT34 represents a distance between an image-side surface of the third lens and an object-side surface of the fourth lens AT an effective aperture, AT45 represents a distance between an image-side surface of the fourth lens and an object-side surface of the fifth lens AT the effective aperture, Σ TC represents a sum of air spaces on the optical axis of each of adjacent two lenses of the first lens to the fifth lens, and Σ CT represents a sum of center thicknesses of each of the lenses of the first lens to the fifth lens on the optical axis.

11. An imaging apparatus comprising the optical lens according to any one of claims 1 to 10 and an imaging element for converting an optical image formed by the optical lens into an electric signal.