CN107290843B

CN107290843B - Optical imaging lens

Info

Publication number: CN107290843B
Application number: CN201710719642.0A
Authority: CN
Inventors: 胡亚斌; 张凯元; 宋博
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2017-08-21
Filing date: 2017-08-21
Publication date: 2022-09-13
Anticipated expiration: 2037-08-21
Also published as: CN107290843A

Abstract

The application discloses an optical imaging lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis, wherein the first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens can have positive focal power or negative focal power, and the object side surface of the second lens can be a concave surface; the third lens may have a positive or negative optical power; the fourth lens can have positive focal power, and the image side surface of the fourth lens can be a convex surface; the fifth lens element may have a negative optical power, and both the object-side surface and the image-side surface may be concave; and the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: CT3/CT4 is more than or equal to 1.5.

Description

Optical imaging lens

Technical Field

The present invention relates to an optical imaging lens, and more particularly, to an optical imaging lens composed of five lenses.

Background

With the increasing requirements of miniaturized electronic products such as mobile phones and tablet computers on imaging functions, higher requirements are put forward on the hardware conditions of a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) image sensor and the optical performance of an imaging lens. Under the condition of the same image plane size of the sensor, the larger the angle of view of the imaging lens is, the more pictures are shot, and the reduction of the pixel size of the sensor can weaken the light collection capability of the optical system, so that the imaging lens needs a larger angle of view and a large aperture to further improve the shooting performance. Meanwhile, the optical lens has the advantages that the number of lenses is small and the optical length is shorter under the condition of meeting the imaging requirement, so that the development of electronic products towards miniaturization trend is facilitated.

Therefore, the present invention is directed to an optical system applicable to portable electronic products, having an ultra-thin large field angle and good imaging quality.

Disclosure of Invention

The technical solution provided by the present application at least partially solves the technical problems described above.

According to an aspect of the present application, there is provided an optical imaging lens having an effective focal length f and an entrance pupil diameter EPD, the optical imaging lens comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein the first lens may have a positive optical power, and an object-side surface thereof may be a convex surface; the second lens can have positive focal power or negative focal power, and the object side surface of the second lens can be a concave surface; the third lens may have a positive optical power or a negative optical power; the fourth lens can have positive focal power, and the image side surface of the fourth lens can be a convex surface; the fifth lens element may have a negative optical power, and both the object-side surface and the image-side surface thereof may be concave; and the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: CT3/CT4 is more than or equal to 1.5.

According to another aspect of the present application, there is also provided an optical imaging lens having an effective focal length f and an entrance pupil diameter EPD, the optical imaging lens comprising, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein the first lens and the fourth lens each have a positive power; at least one of the second lens, the third lens and the fifth lens has negative focal power; wherein, half of the HFOV of the maximum field angle of the optical imaging lens satisfies: HFOV is more than or equal to 45 degrees; and the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: CT3/CT4 is more than or equal to 1.5.

In one embodiment, half of the maximum field angle of the optical imaging lens HFOV satisfies: the HFOV is more than or equal to 45 degrees.

In one embodiment, a radius of curvature R9 of the object-side surface of the fifth lens element and a radius of curvature R10 of the image-side surface thereof may satisfy: -0.9< R10/R9< -0.7, for example, -0.85. ltoreq. R10/R9. ltoreq.0.76.

In one embodiment, a radius of curvature R9 of the object-side surface of the fifth lens and a center thickness CT5 of the fifth lens on the optical axis may satisfy: 7< R9/CT 5.ltoreq.5, for example-6.04. ltoreq.R 9/CT 5.ltoreq.5.03.

In one embodiment, the maximum inclination angle β 52 of the image side surface of the fifth lens element may satisfy: 30 < beta 52<58 deg., e.g., 30.6 ≦ beta 52 ≦ 57 deg..

In one embodiment, the effective focal length f1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: 8.0< f1/CT1<11.0, e.g., 8.52. ltoreq. f1/CT 1. ltoreq.10.66.

In one embodiment, the effective focal length f1 of the first lens and the radius of curvature of the object-side surface R1 of the first lens may satisfy: 1.0< f1/R1<4.0, e.g., 1.82. ltoreq. f 1/R1. ltoreq.2.91.

In one embodiment, the effective focal length f of the optical imaging lens and the effective focal length f4 of the fourth lens satisfy that: 0.6. ltoreq. f4/f <0.8, for example 0.70. ltoreq. f 4/f. ltoreq.0.77.

In one embodiment, the effective focal length f4 of the fourth lens and the central thickness CT4 of the fourth lens on the optical axis satisfy: 4.0< f4/CT4<5.0, e.g., 4.39. ltoreq. f4/CT 4. ltoreq.4.71.

In one embodiment, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -1.6< f4/f5< -1.4, for example, -1.54. ltoreq. f4/f 5. ltoreq.1.47.

In one embodiment, a radius of curvature R5 of the object-side surface of the third lens and a radius of curvature R6 of the image-side surface thereof may satisfy: 0< | R6/R5| <0.5, for example, 0< | R6/R5| ≦ 0.25.

In one embodiment, the object side surface of the first lens is convex.

In one embodiment, the object side surface of the second lens is concave.

In one embodiment, the image-side surface of the fourth lens element is convex.

In one embodiment, the fifth lens has a negative power and both the object side surface and the image side surface are concave.

With the optical imaging lens configured as above, at least one of advantageous effects of ultra-thinning, large field angle, high resolution, miniaturization, high imaging quality, balanced aberration, and the like can be further achieved.

Drawings

The above and other advantages of embodiments of the present application will become apparent from the detailed description made with reference to the following drawings, which are intended to illustrate and not to limit exemplary embodiments of the present application. In the drawings:

fig. 1 is a schematic view showing a configuration of an optical imaging lens according to embodiment 1 of the present application;

fig. 2A shows on-axis chromatic aberration curves of the optical imaging lens of embodiment 1;

fig. 2B shows an astigmatism curve of the optical imaging lens of embodiment 1;

fig. 2C shows a distortion curve of the optical imaging lens of embodiment 1;

fig. 2D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1;

fig. 3 is a schematic structural view showing an optical imaging lens according to embodiment 2 of the present application;

fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2;

fig. 4B shows an astigmatism curve of the optical imaging lens of embodiment 2;

fig. 4C shows a distortion curve of the optical imaging lens of embodiment 2;

fig. 4D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 2;

fig. 5 is a schematic structural view showing an optical imaging lens according to embodiment 3 of the present application;

fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3;

fig. 6B shows an astigmatism curve of the optical imaging lens of embodiment 3;

fig. 6C shows a distortion curve of the optical imaging lens of embodiment 3;

fig. 6D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3;

fig. 7 is a schematic structural view showing an optical imaging lens according to embodiment 4 of the present application;

fig. 8A shows on-axis chromatic aberration curves of an optical imaging lens of embodiment 4;

fig. 8B shows an astigmatism curve of the optical imaging lens of embodiment 4;

fig. 8C shows a distortion curve of the optical imaging lens of embodiment 4;

fig. 8D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 4;

fig. 9 is a schematic structural view showing an optical imaging lens according to embodiment 5 of the present application;

fig. 10A shows on-axis chromatic aberration curves of the optical imaging lens of embodiment 5;

fig. 10B shows an astigmatism curve of the optical imaging lens of embodiment 5;

fig. 10C shows a distortion curve of the optical imaging lens of embodiment 5;

fig. 10D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 5;

fig. 11 is a schematic structural view showing an optical imaging lens according to embodiment 6 of the present application;

fig. 12A shows on-axis chromatic aberration curves of the optical imaging lens of embodiment 6;

fig. 12B shows an astigmatism curve of the optical imaging lens of embodiment 6;

fig. 12C shows a distortion curve of the optical imaging lens of embodiment 6;

fig. 12D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 6;

fig. 13 is a schematic structural view showing an optical imaging lens according to embodiment 7 of the present application;

fig. 14A shows on-axis chromatic aberration curves of the optical imaging lens of embodiment 7;

fig. 14B shows an astigmatism curve of the optical imaging lens of embodiment 7;

fig. 14C shows a distortion curve of the optical imaging lens of embodiment 7;

fig. 14D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 7;

fig. 15 is a schematic structural view showing an optical imaging lens according to embodiment 8 of the present application;

fig. 16A shows on-axis chromatic aberration curves of an optical imaging lens of embodiment 8;

fig. 16B shows an astigmatism curve of the optical imaging lens of embodiment 8;

fig. 16C shows a distortion curve of the optical imaging lens of embodiment 8;

fig. 16D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 8.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that the expressions first, second, etc. in this specification are used only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

It will be further understood that the terms "comprises," "comprising," "includes," "including" and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, the use of "may" mean "one or more embodiments of the application" when describing embodiments of the application. Also, the term "exemplary" is intended to refer to examples or illustrations.

As used herein, the terms "substantially," "about," and the like are used as terms of table approximation and not as terms of table degree, and are intended to account for inherent deviations in measured or calculated values that will be recognized by those of ordinary skill in the art.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The paraxial region refers to a region near the optical axis. The first lens is the lens closest to the object and the fifth lens is the lens closest to the light sensing element. Herein, a surface closest to the object in each lens is referred to as an object side surface, and a surface closest to the imaging surface in each lens is referred to as an image side surface.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The present application is further described below with reference to specific examples.

An optical imaging lens according to an exemplary embodiment of the present application has, for example, five lenses, i.e., a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are arranged in order from the object side to the image side along the optical axis.

In an exemplary embodiment, the first lens may have a positive optical power, with the object side surface being convex; the second lens can have positive focal power or negative focal power, and the object side surface of the second lens is a concave surface; the third lens may have a positive optical power or a negative optical power; the fourth lens can have positive focal power, and the image side surface of the fourth lens is a convex surface; and the fifth lens may have a negative optical power, and both the object-side surface and the image-side surface thereof may be concave. Through the reasonable control of the distribution of the positive and negative focal powers of each lens, the low-order aberration of a control system can be effectively balanced, so that the optical imaging lens obtains better imaging quality, and the characteristic of ultrathin large aperture can be realized.

In an exemplary embodiment, half of the maximum field angle of the optical imaging lens HFOV satisfies: the HFOV is more than or equal to 45 degrees. By controlling the half of the maximum field angle of the optical system to be more than 45 degrees, namely the full field angle to be more than 90 degrees, the wider field range of the system imaging can be ensured.

In an exemplary embodiment, a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis may satisfy: CT3/CT4 is more than or equal to 1.5. The ratio of the central thickness of the third lens on the optical axis to the central thickness of the fourth lens on the optical axis is controlled to be more than 1.5, so that the distribution of the positive focal power of the two lenses is adjusted, the fourth lens bears more focal power, and the configuration is favorable for light rays incident at a large-angle field angle to finally converge on an imaging surface of the optical imaging lens through the lenses.

In an exemplary embodiment, a radius of curvature R9 of the object-side surface of the fifth lens and a radius of curvature R10 of the image-side surface thereof may satisfy: -0.9< R10/R9< -0.7, more specifically, can further satisfy-0.85. ltoreq. R10/R9. ltoreq-0.76. The curvature radii of the object side surface and the image side surface of the fifth lens are controlled to be in a proper range, and the meridian coma of an effective correction system is facilitated.

In an exemplary embodiment, a radius of curvature R9 of an object-side surface of the fifth lens and a center thickness CT5 of the fifth lens on an optical axis may satisfy: 7< R9/CT 5.ltoreq.5, more specifically, may further satisfy-6.04. ltoreq.R 9/CT 5.ltoreq.5.03. By the configuration, the distortion generated by a large-field-angle system can be balanced, and the included angle of the chief ray of each field-angle light reaching the imaging surface is larger and is matched with a sensor chip with a large-angle chief ray included angle.

In an exemplary embodiment, the maximum inclination angle β 52 of the image side surface of the fifth lens may satisfy: 30 ° < β 52<58 °, more specifically, 30.6 ° ≦ β 52 ≦ 57 ° may be further satisfied. By controlling the maximum inclination angle of the image side surface of the fifth lens, the problem that the film coating effect on the edge of the lens is not ideal due to the overlarge inclination angle and the system manufacturability is poor can be avoided.

In an exemplary embodiment, an effective focal length f1 of the first lens and a center thickness CT1 of the first lens on the optical axis may satisfy: 8.0< f1/CT1<11.0, and more specifically, can further satisfy 8.52. ltoreq. f1/CT 1. ltoreq.10.66. The ratio of the effective focal length to the central thickness of the first lens is balanced reasonably, so that the aberration of an optical imaging system is corrected, and the feasibility of forming processing manufacturability can be ensured.

In an exemplary embodiment, the effective focal length f1 of the first lens and the radius of curvature of the object-side surface R1 of the first lens may satisfy: 1.0< f1/R1<4.0, and more specifically, 1.82. ltoreq. f 1/R1. ltoreq.2.91 can be further satisfied. By such a configuration, the first lens is made to control the object-side curvature radius thereof not to be excessively small while assuming a partial positive power, reducing the risk of generating ghost images due to a large tilt angle.

In an exemplary embodiment, the effective focal length f of the optical imaging lens and the effective focal length f4 of the fourth lens may satisfy: 0.6. ltoreq. f4/f <0.8, more specifically, 0.70. ltoreq. f 4/f. ltoreq.0.77 can be further satisfied. Through the configuration, the aberration influence caused by the deflection amount of the light is controlled under the condition that TTL is reduced, and meanwhile, the incident angle of the light on the object side surface of the fourth lens is reduced as much as possible, so that the transmittance of the light is facilitated.

In an exemplary embodiment, an effective focal length f4 of the fourth lens and a center thickness CT4 of the fourth lens on the optical axis may satisfy: 4.0< f4/CT4<5.0, and more specifically, can further satisfy 4.39. ltoreq. f4/CT 4. ltoreq.4.71. The central thickness of the lens can influence the optical focal length value, and the ratio of the focal length of the fourth lens to the central thickness is controlled within a certain range, so that the distortion and astigmatism of a system can be corrected, and the manufacturability problem caused by too large or too small central thickness can be prevented.

In an exemplary embodiment, an effective focal length f4 of the fourth lens and an effective focal length f5 of the fifth lens may satisfy: -1.6< f4/f5< -1.4, more particularly, can further satisfy-1.54. ltoreq. f4/f 5. ltoreq.1.47. The two lenses are reasonably distributed with positive focal power and negative focal power, so that chromatic aberration generated by the system can be balanced.

In an exemplary embodiment, a radius of curvature R5 of the object-side surface of the third lens and a radius of curvature R6 of the image-side surface thereof may satisfy: 0< | R6/R5| <0.5, more specifically, 0< | R6/R5| ≦ 0.25 can be further satisfied. By controlling the radii of curvature of the object-side surface and the image-side surface of the third lens to be within a proper range, astigmatism of the system can be effectively corrected.

In an exemplary embodiment, the optical imaging lens may further include a stop STO for limiting a light beam, and the amount of light entering is adjusted to improve the imaging quality.

The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, five lenses as described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the axial distance between each lens and the like, the aperture of the optical imaging lens can be effectively enlarged, the system sensitivity is reduced, the miniaturization of the lens is ensured, and the imaging quality is improved, so that the optical imaging lens is more favorable for production and processing and is suitable for portable electronic products.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, has the advantages of improving distortion aberration and astigmatic aberration, and can make the field of view larger and more realistic. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. In addition, the use of the aspherical lens can also effectively reduce the number of lenses in the optical system.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although five lenses are exemplified in the embodiment, the optical imaging lens is not limited to include five lenses. The optical imaging lens may also include other numbers of lenses, if desired.

Specific examples of an optical imaging lens applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical imaging lens according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D.

Fig. 1 shows a schematic structural diagram of an optical imaging lens according to embodiment 1 of the present application. As shown in fig. 1, the optical imaging lens includes five lenses E1-E5 arranged in order from the object side to the imaging side along the optical axis. The first lens E1 has an object-side surface S1 and an image-side surface S2; the second lens E2 has an object-side surface S3 and an image-side surface S4; the third lens E3 has an object-side surface S5 and an image-side surface S6; the fourth lens E4 has an object-side surface S7 and an image-side surface S8; and the fifth lens E5 has an object-side surface S9 and an image-side surface S10.

In this embodiment, the first lens E1 has positive optical power, and its object-side surface S1 is convex; the second lens E2 has negative focal power, and the object side surface S3 is a concave surface; the third lens E3 has positive optical power; the fourth lens E4 has positive focal power, and the image-side surface S8 thereof is convex; and the fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10.

In the optical imaging lens of the present embodiment, an aperture stop STO for limiting a light beam is further included, which is disposed between the object side and the first lens. The optical imaging lens according to embodiment 1 may include a filter E6 having an object side S11 and an image side S12, and the filter E6 may be used to correct color deviation. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 1.

TABLE 1

As can be seen from table 1, the central thickness CT3 of the third lens E3 on the optical axis and the central thickness CT4 of the fourth lens E4 on the optical axis satisfy CT3/CT4 ═ 1.5; the curvature radius R9 of the object side S9 of the fifth lens E5 and the curvature radius R10 of the image side S10 of the fifth lens E5 meet the requirement that R10/R9 is-0.85; the radius of curvature R9 of the object-side surface S9 of the fifth lens E5 and the central thickness CT5 of the fifth lens E5 on the optical axis satisfy: R9/CT5 ═ 6.04; and the radius of curvature R5 of the object-side surface S5 of the third lens E3 and the radius of curvature R6 of the image-side surface S6 satisfy | R6/R5|, 0.21.

In the embodiment, five lenses are taken as an example, and the focal length and the surface type of each lens are reasonably distributed, so that the aperture of the lens is effectively enlarged, the total length of the lens is shortened, and the large aperture and the miniaturization of the lens are ensured; meanwhile, various aberrations are corrected, and the resolution and the imaging quality of the lens are improved. Each aspherical surface type x is defined by the following 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 direction; c is the paraxial curvature of the aspheric surface, and c is 1/R (i.e., paraxial curvature c is the reciprocal of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1 above); ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the coefficients A of the higher-order terms that can be used for the respective mirrors S1-S10 in example 1 ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ 、A ₁₈ And A ₂₀ 。

TABLE 2

Table 3 shown below shows the effective focal lengths f1 to f5 of the respective lenses of example 1, the effective focal length f of the optical imaging lens, half ImgH of the diagonal length of the effective pixel area of the electro-optical element of the optical imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens.

TABLE 3

f1(mm)	3.83	f(mm)	2.95
				f2(mm)	-5.06	TTL(mm)	4.12
f3(mm)	3.96	ImgH(mm)	3.01
				f4(mm)	2.27
f5(mm)	-1.51

As can be seen from table 3, the effective focal length f of the optical imaging lens and the effective focal length f4 of the fourth lens E4 satisfy f 4/f-0.77; and the effective focal length f4 of the fourth lens E4 and the effective focal length f5 of the fifth lens E5 satisfy f4/f 5-1.5.

With reference to table 1 and table 3 above, in this embodiment, half of the HFOV of the maximum field angle of the optical imaging lens meets the requirement that the HFOV is 45.5 °; the maximum inclination angle β 52 of the image side S10 of the fifth lens E5 satisfies β 52 — 57 °; the effective focal length f1 of the first lens E1 and the central thickness CT1 of the first lens E1 on the optical axis satisfy f1/CT 1-9.59; the effective focal length f1 of the first lens E1 and the curvature radius R1 of the object side S1 of the first lens E1 meet f1/R1 of 1.82; the effective focal length f4 of the fourth lens E4 and the central thickness CT4 of the fourth lens E4 on the optical axis satisfy f4/CT 4-4.71.

Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 2B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 1. Fig. 2C shows a distortion curve of the optical imaging lens of embodiment 1, which represents the distortion magnitude values in the case of different angles of view. Fig. 2D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1, which represents a deviation of different image heights on an imaging surface of light rays after passing through the optical imaging lens. As can be seen from fig. 2A to 2D, the optical imaging lens according to embodiment 1 can achieve good imaging quality.

Example 2

An optical imaging lens according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D.

Fig. 3 shows a schematic structural diagram of an optical imaging lens according to embodiment 2 of the present application. As shown in fig. 3, the optical imaging lens according to embodiment 2 includes first to fifth lenses E1-E5 having an object side surface and an image side surface, respectively.

Table 4 below shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 2. Table 5 shows the high-order coefficient of each aspherical mirror surface in example 2. Table 6 shows the effective focal lengths f1 to f5 of the respective lenses, the effective focal length f of the optical imaging lens, ImgH which is half the diagonal length of the effective pixel area of the electro-optical element of the optical imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens of example 2. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

TABLE 4

TABLE 5

TABLE 6

Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 2. Fig. 4C shows a distortion curve of the optical imaging lens of embodiment 2, which represents the distortion magnitude values in the case of different angles of view. Fig. 4D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 2, which represents a deviation of different image heights on the imaging plane after light passes through the optical imaging lens. As can be seen from fig. 4A to 4D, the optical imaging lens according to embodiment 2 can achieve good imaging quality.

Example 3

An optical imaging lens according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D.

Fig. 5 shows a schematic structural diagram of an optical imaging lens according to embodiment 3 of the present application. As shown in fig. 5, the optical imaging lens according to embodiment 3 includes first to fifth lenses E1 to E5 having an object side surface and an image side surface, respectively.

In this embodiment, the first lens E1 has positive optical power, and its object-side surface S1 is convex; the second lens E2 has negative focal power, and the object side surface S3 is concave; the third lens E3 has positive optical power; the fourth lens E4 has positive focal power, and the image-side surface S8 thereof is convex; and the fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10.

Table 7 below shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 3. Table 8 shows the high-order coefficient of each aspherical mirror surface in example 3. Table 9 shows the effective focal lengths f1 to f5 of the respective lenses, the effective focal length f of the optical imaging lens, the half ImgH of the diagonal length of the effective pixel area of the electro-optical element of the optical imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens of example 3. Wherein each aspherical surface type can be defined by formula (1) given in embodiment 1 above.

TABLE 7

TABLE 8

TABLE 9

f1(mm)	4.01	f(mm)	2.95
				f2(mm)	-5.80	TTL(mm)	4.00
f3(mm)	3.95	ImgH(mm)	3.01
				f4(mm)	2.12
f5(mm)	-1.41

Fig. 6A shows on-axis chromatic aberration curves of the optical imaging lens of embodiment 3, which represent deviation of the convergence focus of light rays of different wavelengths after passing through the optical imaging lens. Fig. 6B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 3. Fig. 6C shows a distortion curve of the optical imaging lens of embodiment 3, which represents the distortion magnitude values in the case of different angles of view. Fig. 6D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, which represents a deviation of different image heights on the imaging plane after light passes through the optical imaging lens. As can be seen from fig. 6A to 6D, the optical imaging lens according to embodiment 3 can achieve good imaging quality.

Example 4

An optical imaging lens according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D.

Fig. 7 shows a schematic structural diagram of an optical imaging lens according to embodiment 4 of the present application. As shown in fig. 7, the optical imaging lens according to embodiment 4 includes first to fifth lenses E1 to E5 having an object side surface and an image side surface, respectively.

Table 10 below shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 4. Table 11 shows the high-order coefficient of each aspherical mirror surface in example 4. Table 12 shows the effective focal lengths f1 to f5 of the respective lenses, the effective focal length f of the optical imaging lens, ImgH which is half the diagonal length of the effective pixel area of the electro-optical element of the optical imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens of example 4. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

TABLE 10

TABLE 11

TABLE 12

f1(mm)	4.10	f(mm)	2.87
				f2(mm)	-6.06	TTL(mm)	3.94
f3(mm)	3.97	ImgH(mm)	3.01
				f(mm)	2.10
f5(mm)	-1.43

Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 8B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 4. Fig. 8C shows a distortion curve of the optical imaging lens of embodiment 4, which represents the distortion magnitude values in the case of different angles of view. Fig. 8D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 4, which represents a deviation of different image heights on the imaging plane after light passes through the optical imaging lens. As can be seen from fig. 8A to 8D, the optical imaging lens according to embodiment 4 can achieve good imaging quality.

Example 5

An optical imaging lens according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D.

Fig. 9 shows a schematic structural diagram of an optical imaging lens according to embodiment 5 of the present application. As shown in fig. 9, the optical imaging lens according to embodiment 5 includes first to fifth lenses E1-E5 having an object side surface and an image side surface, respectively.

In this embodiment, the first lens E1 has positive optical power, and its object-side surface S1 is convex; the second lens E2 has negative focal power, and the object side surface S3 is concave; the third lens E3 has positive optical power; the fourth lens E4 has positive focal power, and the image side surface S8 is a convex surface; and the fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10.

Table 13 below shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 5. Table 14 shows the high-order coefficient of each aspherical mirror surface in example 5. Table 15 shows the effective focal lengths f1 to f5 of the respective lenses, the effective focal length f of the optical imaging lens, ImgH which is half the diagonal length of the effective pixel area of the electro-optical element of the optical imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens of example 5. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

Watch 13

TABLE 14

Watch 15

f1(mm)	4.06	f(mm)	3.02
				f2(mm)	-6.72	TTL(mm)	4.08
f3(mm)	4.17	ImgH(mm)	3.01
				f4(mm)	2.12
f5(mm)	-1.39

Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 10B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 5. Fig. 10C shows a distortion curve of the optical imaging lens of embodiment 5, which represents the distortion magnitude values in the case of different angles of view. Fig. 10D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 5, which represents a deviation of different image heights on the imaging plane after light passes through the optical imaging lens. As can be seen from fig. 10A to 10D, the optical imaging lens according to embodiment 5 can achieve good imaging quality.

Example 6

An optical imaging lens according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D.

Fig. 11 shows a schematic structural view of an optical imaging lens according to embodiment 6 of the present application. As shown in fig. 11, the optical imaging lens according to embodiment 6 includes first to fifth lenses E1-E5 having an object side surface and an image side surface, respectively.

Table 16 below shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 6. Table 17 shows the high-order coefficient of each aspherical mirror surface in example 6. Table 18 shows effective focal lengths f1 to f5 of the respective lenses of example 6, an effective focal length f of the optical imaging lens, ImgH which is half the diagonal length of the effective pixel area of the electro-optical element of the optical imaging lens, and a distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

TABLE 16

TABLE 17

Watch 18

f1(mm)	3.99	f(mm)	2.99
				f2(mm)	-6.88	TTL(mm)	4.01
f3(mm)	4.27	ImgH(mm)	3.01
				f4(mm)	2.12
f5(mm)	-1.38

Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 6, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 6. Fig. 12C shows a distortion curve of the optical imaging lens of embodiment 6, which represents the distortion magnitude values in the case of different angles of view. Fig. 12D shows a chromatic aberration of magnification curve of the optical imaging lens according to embodiment 6, which shows the deviation of different image heights of light rays on the imaging surface after passing through the optical imaging lens, and it can be seen from fig. 12A to 12D that the optical imaging lens according to embodiment 6 can achieve good imaging quality.

Example 7

An optical imaging lens according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D.

Fig. 13 is a schematic structural view showing an optical imaging lens according to embodiment 7 of the present application. As shown in fig. 13, the optical imaging lens according to embodiment 7 includes first to fifth lenses E1-E5 having an object side surface and an image side surface, respectively.

In this embodiment, the first lens E1 has positive optical power, and its object-side surface S1 is convex; the second lens E2 has negative focal power, and the object side surface S3 is a concave surface; the third lens E3 has positive optical power; the fourth lens E4 has positive focal power, and the image-side surface S8 thereof is convex; and the fifth lens E5 has negative power, and its object-side surface S9 is concave and its image-side surface S10 is concave.

Table 19 below shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 7. Table 20 shows the high-order coefficient of each aspherical mirror surface in example 7. Table 21 shows effective focal lengths f1 to f5 of the respective lenses, an effective focal length f of the optical imaging lens, ImgH which is half the diagonal length of the effective pixel area of the electro-optical element of the optical imaging lens, and a distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens of example 7. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

Watch 19

Watch 20

TABLE 21

f1(mm)	3.95	f(mm)	3.01
				f2(mm)	-7.06	TTL(mm)	4.06
f3(mm)	4.35	ImgH(mm)	3.01
				f4(mm)	2.12
f5(mm)	-1.38

Fig. 14A shows on-axis chromatic aberration curves of the optical imaging lens of embodiment 7, which represent deviation of convergence focuses of light rays of different wavelengths after passing through the optical imaging lens. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 7. Fig. 14C shows a distortion curve of the optical imaging lens of embodiment 7, which represents the distortion magnitude values in the case of different angles of view. Fig. 14D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 7, which represents a deviation of different image heights on the imaging surface of light rays after passing through the optical imaging lens. As can be seen from fig. 14A to 14D, the optical imaging lens according to embodiment 7 can achieve good imaging quality.

Example 8

An optical imaging lens according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D.

Fig. 15 shows a schematic structural diagram of an optical imaging lens according to embodiment 8 of the present application. As shown in fig. 15, the optical imaging lens according to embodiment 8 includes first to fifth lenses E1-E5 having an object side surface and an image side surface, respectively.

Table 22 below shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 8. Table 23 shows the high-order coefficient of each aspherical mirror surface in example 8. Table 24 shows effective focal lengths f1 to f5 of the respective lenses of example 8, an effective focal length f of the optical imaging lens, ImgH which is half the diagonal length of the effective pixel area of the electro-optical element of the optical imaging lens, and a distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the optical imaging lens. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.

TABLE 22

TABLE 23

Watch 24

f1(mm)	3.96	f(mm)	3.01
				f2(mm)	-5.91	TTL(mm)	4.05
f3(mm)	4.02	ImgH(mm)	3.01
				f4(mm)	2.12
f5(mm)	-1.39

Fig. 16A shows on-axis chromatic aberration curves of the optical imaging lens of embodiment 8, which represent deviation of convergence focuses of light rays of different wavelengths after passing through the optical imaging lens. Fig. 16B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 8. Fig. 16C shows a distortion curve of the optical imaging lens of embodiment 8, which represents the distortion magnitude values in the case of different angles of view. Fig. 16D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 8, which represents a deviation of different image heights on an imaging surface of light rays after passing through the optical imaging lens. As can be seen from fig. 16A to 16D, the optical imaging lens according to embodiment 8 can achieve good imaging quality.

In summary, examples 1 to 8 each satisfy the relationship shown in table 25 below.

TABLE 25

Conditions/examples	1	2	3	4	5	6	7	8
									HFOV	45.5	45.4	46.6	46.0	45.0	45.2	45.0	45.2
CT3/CT4	1.50	1.52	1.50	1.50	1.50	1.52	1.51	1.51
									R10/R9	-0.85	-0.78	-0.79	-0.80	-0.77	-0.76	-0.76	-0.77
f1/CT1	9.59	8.52	10.03	10.66	8.75	9.41	9.22	9.11
									f4/f	0.77	0.71	0.72	0.73	0.70	0.71	0.71	0.70
R9/CT5	-6.04	-5.26	-5.04	-5.51	-5.09	-6.03	-5.34	-5.03
									β52	57.00	37.60	55.20	56.50	43.60	30.60	55.50	46.40
f4/CT4	4.71	4.51	4.48	4.39	4.47	4.56	4.52	4.49
									\|R6/R5\|	0.21	0.20	0.24	0.25	0.15	0.11	0	0.20
f4/f5	-1.50	-1.52	-1.50	-1.47	-1.52	-1.54	-1.54	-1.53
									f1/R1	1.82	2.81	2.86	2.91	2.87	2.86	2.81	2.82

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. The optical imaging lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis in sequence, the number of the lenses with focal power in the optical imaging lens is five,

it is characterized in that the preparation method is characterized in that,

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

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

the third lens has positive optical power;

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

the fifth lens has negative focal power, and the object side surface and the image side surface of the fifth lens are both concave surfaces; and

a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: CT3/CT4 is more than or equal to 1.5;

an effective focal length f4 of the fourth lens and a center thickness CT4 of the fourth lens on the optical axis satisfy: 4.0< f4/CT4< 5.0.

2. The optical imaging lens of claim 1, wherein half of the maximum field angle HFOV of the optical imaging lens satisfies: the HFOV is more than or equal to 45 degrees.

3. The optical imaging lens according to claim 1 or 2, characterized in that a radius of curvature R9 of the object-side surface of the fifth lens and a radius of curvature R10 of the image-side surface thereof satisfy: -0.9< R10/R9< -0.7.

4. The optical imaging lens of claim 3, wherein a radius of curvature R9 of an object-side surface of the fifth lens and a center thickness CT5 of the fifth lens on the optical axis satisfy: 7< R9/CT5 ≦ -5.

5. The optical imaging lens of claim 4, wherein the maximum inclination angle β 52 of the image side surface of the fifth lens satisfies: 30 ° < β 52<58 °.

6. The optical imaging lens according to claim 1 or 2, characterized in that an effective focal length f1 of the first lens and a center thickness CT1 of the first lens on the optical axis satisfy: 8.0< f1/CT1< 11.0.

7. The optical imaging lens of claim 6, wherein the effective focal length f1 of the first lens and the radius of curvature of the first lens object side R1 satisfy: 1.0< f1/R1< 4.0.

8. The optical imaging lens of claim 3, wherein an effective focal length f4 between the optical imaging lens and the effective focal length f of the fourth lens satisfies: f4/f is more than or equal to 0.6 and less than 0.8.

9. The optical imaging lens of claim 1, wherein an effective focal length f4 of the fourth lens and an effective focal length f5 of the fifth lens satisfy: -1.6< f4/f5< -1.4.

10. An optical imaging lens according to claim 1 or 2, characterized in that the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface thereof satisfy: 0< | R6/R5| < 0.5.

11. An optical imaging lens having an effective focal length f and an entrance pupil diameter EPD, the optical imaging lens comprising, in order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, the optical imaging lens having a power of five,

it is characterized in that the preparation method is characterized in that,

the first lens, the third lens and the fourth lens all have positive optical power;

the second lens and the fifth lens both have negative optical power,

half of the maximum field angle of the optical imaging lens is satisfied by the HFOV: HFOV is more than or equal to 45 degrees;

wherein a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: CT3/CT4 is more than or equal to 1.5; and

12. The optical imaging lens of claim 11, wherein the object side surface of the first lens is convex.

13. The optical imaging lens of claim 11, wherein the object side surface of the second lens is concave.

14. The optical imaging lens of claim 11, wherein the image side surface of the fourth lens is convex.

15. The optical imaging lens of claim 11, wherein the fifth lens has concave object-side and image-side surfaces.

16. An optical imaging lens according to claim 11 or 15, characterized in that the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface thereof satisfy: -0.9< R10/R9< -0.7.

17. The optical imaging lens of claim 16, wherein a radius of curvature R9 of an object-side surface of the fifth lens and a center thickness CT5 of the fifth lens on the optical axis satisfy: 7< R9/CT5 ≦ -5.

18. The optical imaging lens of claim 17, wherein the maximum inclination angle β 52 of the image side surface of the fifth lens satisfies: 30 ° < β 52<58 °.

19. The optical imaging lens of claim 11 or 12, characterized in that between the effective focal length f1 of the first lens and the central thickness CT1 of the first lens on the optical axis, it satisfies: 8.0< f1/CT1< 11.0.

20. The optical imaging lens of claim 19, wherein the effective focal length f1 of the first lens and the radius of curvature of the object side surface of the first lens R1 satisfy: 1.0< f1/R1< 4.0.

21. The optical imaging lens of claim 12, wherein the effective focal length f of the optical imaging lens and the effective focal length f4 of the fourth lens satisfy: f4/f is more than or equal to 0.6 and less than 0.8.

22. The optical imaging lens of claim 11, wherein an effective focal length f4 of the fourth lens and an effective focal length f5 of the fifth lens satisfy: -1.6< f4/f5< -1.4.

23. The optical imaging lens of claim 11, wherein the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface thereof satisfy: 0< | R6/R5| < 0.5.