CN107121756B

CN107121756B - Optical imaging system

Info

Publication number: CN107121756B
Application number: CN201710506294.9A
Authority: CN
Inventors: 张凯元; 贾远林
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2017-06-28
Filing date: 2017-06-28
Publication date: 2022-09-06
Anticipated expiration: 2037-06-28
Also published as: CN107121756A

Abstract

The application discloses an optical imaging system, this optical imaging system includes from the object side to the image side along the optical axis in order: the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Wherein the first lens and the fourth lens can both have negative focal power; the second lens and the sixth lens can both have positive optical power or negative optical power; the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens can satisfy 0 < f3/f5 < 0.8.

Description

Optical imaging system

Technical Field

The present application relates to an optical imaging system, and more particularly, to a wide-angle imaging system including six lenses.

Background

In addition to the need for higher resolution, current optical imaging systems also place higher demands on the range of field angles. Since an optical imaging system with a large field angle can contain more object information when imaging, an imaging lens with a large field angle has become a trend.

Meanwhile, due to the increasing development of portable electronic products, corresponding requirements are put forward on the miniaturization and light weight of the lens. Therefore, the lens is required to have performance such as ultra-wide angle, high resolution, and high imaging quality on the premise of satisfying miniaturization and light weight.

Disclosure of Invention

The present application provides an optical imaging system applicable to portable electronic products that may address, at least in part, at least one of the above-identified deficiencies in the prior art.

One aspect of the present application provides an optical imaging system, in order from an object side to an image side along an optical axis, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens and the fourth lens may each have a negative optical power; the second lens and the sixth lens can both have positive optical power or negative optical power; the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens can satisfy 0 < f3/f5 < 0.8.

Another aspect of the present application provides an optical imaging system having a total effective focal length f and comprising, in order from an object side to an image side along an optical axis: the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens may have a negative optical power; the second lens and the sixth lens can both have positive power or negative power; a combined power of the third lens, the fourth lens, and the fifth lens may be a positive power, wherein at least one of the third lens, the fourth lens, and the fifth lens may have a negative power, and a combined power f345 of the third lens, the fourth lens, and the fifth lens may satisfy 0.5 < f/f345 < 0.9.

Another aspect of the present application also provides an optical imaging system including, 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, a fifth lens, and a sixth lens having optical power. The first lens and the fourth lens can both have negative focal power; the third lens and the fifth lens can both have positive focal power; at least one of the second lens and the sixth lens may have positive optical power, and a sagittal height SAG61 of an object-side surface of the sixth lens at a maximum radius and a central thickness CT6 of the sixth lens on an optical axis may satisfy | SAG61|/CT6 < 1.

In one embodiment, the combined optical power of the third lens, the fourth lens, and the fifth lens may be a positive optical power.

In one embodiment, the third lens and the fifth lens each have positive optical power.

In one embodiment, the fourth lens may have a negative optical power.

In one embodiment, the maximum half field angle HFOV of the optical imaging system may satisfy Tan (HFOV/2) ≧ 0.9.

In one embodiment, the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens may satisfy 0 < f3/f5 < 0.8.

In one embodiment, the total effective focal length f of the optical imaging system and the combined focal length f345 of the third, fourth, and fifth lenses may satisfy 0.5 < f/f345 < 0.9.

In one embodiment, the total effective focal length f of the optical imaging system and the effective focal length f2 of the second lens can satisfy f/f2 ≦ 0.2.

In one embodiment, the total effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens can satisfy-1.5 < f/f4 < -0.5.

In one embodiment, the effective focal length f1 of the first lens and the effective focal length f6 of the sixth lens can satisfy | f1/f6| < 0.5.

In one embodiment, the edge thickness ET6 of the sixth lens at the maximum radius and the central thickness CT6 of the sixth lens on the optical axis may satisfy 1 < ET6/CT6 < 2.

In one embodiment, the saga 61 of the object side surface of the sixth lens at the maximum radius and the central thickness CT6 of the sixth lens on the optical axis may satisfy | SAG61|/CT6 < 1.

In one embodiment, the central thickness CT6 of the sixth lens element on the optical axis and the central thickness CT1 of the first lens element on the optical axis satisfy 0.5 < CT6/CT1 < 1.0.

In one embodiment, the sum Σ AT of the air interval T56 of the fifth lens and the sixth lens in the optical axis and the separation distance on the optical axis of any adjacent two lenses of the first lens to the sixth lens may satisfy 0.1 < T56/∑ AT < 0.5.

In one embodiment, the total effective focal length f of the optical imaging system and the radius of curvature of the object side surface of the second lens, R3, may satisfy f/| R3| < 0.3.

In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy-5.0 < R7/R8 < 0.

In one embodiment, the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system may satisfy f/EPD ≦ 2.2.

The application adopts a plurality of lenses (for example, six lenses), and the optical imaging system has at least one of the following advantages by reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like:

the field angle of the imaging system is effectively enlarged;

shortening the total length of the imaging system;

various aberrations are corrected; and

the resolution and the imaging quality of the lens are improved.

Drawings

Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application;

fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatic curve, a chromatic aberration of magnification curve, and a relative illuminance curve, respectively, of the optical imaging system of embodiment 1;

fig. 3 shows a schematic configuration diagram of an optical imaging system according to embodiment 2 of the present application;

fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatic curve, a chromatic aberration of magnification curve, and a relative illuminance curve, respectively, of the optical imaging system of embodiment 2;

fig. 5 shows a schematic configuration diagram of an optical imaging system according to embodiment 3 of the present application;

fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatic curve, a chromatic aberration of magnification curve, and a relative illuminance curve, respectively, of the optical imaging system of embodiment 3;

fig. 7 shows a schematic configuration diagram of an optical imaging system according to embodiment 4 of the present application;

fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatic curve, a chromatic aberration of magnification curve, and a relative illuminance curve, respectively, of the optical imaging system of embodiment 4;

fig. 9 shows a schematic configuration diagram of an optical imaging system according to embodiment 5 of the present application;

fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatic curve, a chromatic aberration of magnification curve, and a relative illuminance curve, respectively, of the optical imaging system of example 5;

fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application;

fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatic curve, a chromatic aberration of magnification curve, and a relative illuminance curve, respectively, of the optical imaging system of example 6;

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

fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatic curve, a chromatic aberration of magnification curve, and a relative illuminance curve, respectively, of the optical imaging system of example 7;

fig. 15 shows a schematic configuration diagram of an optical imaging system according to embodiment 8 of the present application;

fig. 16A to 16D show an on-axis chromatic aberration curve, an astigmatism curve, a chromatic aberration of magnification curve, and a relative illuminance curve of an optical imaging system of example 8, respectively.

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 in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third 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.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface, and the surface of each lens closest to the image plane is called the image side surface.

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

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.

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 following provides a detailed description of the features, principles, and other aspects of the present application.

An optical imaging system according to an exemplary embodiment of the present application includes, for example, six lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The six lenses are arranged in order from the object side to the image side along the optical axis. The optical imaging system according to the exemplary embodiment of the present application may further include an electron-sensitive element disposed on the imaging surface.

The first lens may have a negative optical power; the second lens may have a positive or negative optical power; the third lens may have a positive optical power; the fourth lens may have a negative optical power; the fifth lens may have positive optical power; and the sixth lens may have a positive power or a negative power.

The maximum half field angle HFOV of the optical imaging system satisfies Tan (HFOV/2) ≥ 0.9, more specifically, the HFOV further satisfies Tan (HFOV/2) ≤ 0.99 ≤ 1.00. Through reasonable power distribution and definition of the field angle, the system obtains a larger field angle on the premise of ensuring excellent imaging quality.

The effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens satisfy 0 < f3/f5 < 0.8, and more specifically, f3 and f5 further satisfy 0.36 ≦ f3/f5 ≦ 0.63. By limiting the optical power of the third lens and the fifth lens within a reasonable range, the system can have good astigmatism balancing capability.

The total effective focal length f of the optical imaging system and the combined focal length f345 of the third lens, the fourth lens and the fifth lens may satisfy 0.5 < f/f345 < 0.9, and more specifically, f and f345 may further satisfy 0.58 ≦ f/f345 ≦ 0.78. By limiting the combined focal power of the third lens, the fourth lens and the fifth lens within a reasonable range, the three lenses can bear reasonable focal power and meet the requirement of an imaging field of view.

F/f2 ≦ 0.2 may be satisfied between the total effective focal length f of the optical imaging system and the effective focal length f2 of the second lens, and more specifically, f and f2 may further satisfy 0.07 ≦ f/f2 ≦ 0.15. The numerical range of the effective focal length f2 of the second lens is restrained, so that the second lens has reasonable capability of balancing spherical aberration and coma aberration, and the imaging quality of the system can be effectively improved.

The total effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens can satisfy-1.5 < f/f4 < -0.5, more specifically, f and f4 can further satisfy-1.36 < f/f4 < 0.83. By defining the range of the negative power of the fourth lens, the fourth lens generates positive spherical aberration which can be used for balancing the spherical aberration of the system, so that the system has good imaging quality.

The effective focal length f1 of the first lens and the effective focal length f6 of the sixth lens can satisfy | f1/f6| < 0.5, more specifically, f1 and f6 can further satisfy | f1/f6| ≦ 0.40 ≦ 0.03 ≦ f. By defining the power range of the first lens and the sixth lens, the first lens and the sixth lens can be made to have a reasonable distortion range.

Between the edge thickness ET6 of the sixth lens at the maximum radius and the center thickness CT6 of the sixth lens on the optical axis, 1 < ET6/CT6 < 2 can be satisfied, more specifically, ET6 and CT6 further satisfy 1.16 ≦ ET6/CT6 ≦ 1.67. The sixth lens has good processability by defining the ranges of the edge thickness and the center thickness of the sixth lens.

The SAGs 61/CT 6 between the sagittal height SAG61 of the object side surface of the sixth lens at the maximum radius and the central thickness CT6 of the sixth lens on the optical axis may satisfy | SAG61|/CT6 < 1, and more specifically, SAG61 and CT6 may further satisfy | SAG61|/CT6 ≦ 0.74. By limiting the maximum rise of the sixth lens, the sixth lens can be made to have good processability, and processing errors can be reduced.

The central thickness CT6 of the sixth lens on the optical axis and the central thickness CT1 of the first lens on the optical axis can satisfy 0.5 < CT6/CT1 < 1.0, more specifically, CT6 and CT1 can further satisfy 0.55 < CT6/CT1 < 0.85. The distortion of the large-field-of-view system is distributed in a reasonable range by limiting the range of the center thicknesses of the sixth lens and the first lens to control the distortion of the sixth lens and the first lens in different directions.

The air interval T56 of the fifth lens and the sixth lens on the optical axis and the sum Σ AT of the separation distances on the optical axis of any adjacent two lenses of the first lens to the sixth lens may satisfy 0.1 < T56/Σ AT < 0.5, and more specifically, T56 and Σ AT may further satisfy 0.13 ≦ T56/Σ AT ≦ 0.31. By limiting the spacing distance between the fifth lens and the sixth lens, the astigmatism of the system can be adjusted to control the astigmatism of the system within a reasonable range, so that the system has good imaging quality and excellent resolving power.

The total effective focal length f of the optical imaging system and the radius of curvature R3 of the object-side surface of the second lens may satisfy f/| R3| < 0.3, and more specifically, f and R3 may further satisfy 0.11 ≦ f/| R3| ≦ 0.21. By controlling the radius of curvature of the object-side surface of the second lens (when the stop is arranged between the second lens and the third lens, the radius of curvature of the object-side surface of the second lens is the curvature of the lens near the aperture stop), the spherical aberration of the system can be reasonably adjusted and controlled, and thus good imaging quality is obtained in the on-axis and on-axis near fields of view of the optical imaging system.

The radius of curvature R7 of the object-side surface of the fourth lens element and the radius of curvature R8 of the image-side surface of the fourth lens element can satisfy-5.0 < R7/R8 < 0, and more specifically, R7 and R8 can further satisfy-3.54 < R7/R8 < 0.85. The curvature radius ranges of the object side surface and the image side surface of the fourth lens are reasonably controlled, namely the bending direction and the bending size of the object side surface and the image side surface of the fourth lens are reasonably controlled, so that the fourth lens has good capability of balancing axial chromatic aberration, and the optical imaging system can obtain good imaging quality within a certain imaging waveband bandwidth range.

f/EPD ≦ 2.2 may be satisfied between the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system, and more specifically, f and EPD may further satisfy 1.8 ≦ f/EPD ≦ 2.2. By controlling the ratio of the total effective focal length F to the entrance pupil diameter EPD (i.e. the F-number of the system), the system is enabled to obtain good imaging quality in low light conditions. In addition, on the premise of sufficient design freedom, a reasonable F number is limited, and the transfer function design value of the system can be reasonably improved, so that the optical system can be ensured to obtain good imaging quality in design.

In an exemplary embodiment, a stop for limiting the light beam may be disposed between, for example, the second lens and the third lens to improve the imaging quality of the optical imaging system. Alternatively, the diaphragm may be an aperture diaphragm.

Optionally, the optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the imaging surface.

In order to meet the requirements of miniaturization and light weight, plastic lenses can be used for each lens in the optical imaging system.

In addition, as known to those skilled in the art, the aspheric lens has better curvature radius characteristics, and has the advantages of improving distortion aberration and improving astigmatic aberration. In the embodiment of the present application, an aspheric lens may be adopted to eliminate aberration occurring at the time of imaging as much as possible, thereby further improving the imaging quality of the optical imaging system. The aspheric lens is used, so that the image quality can be obviously improved, the aberration can be reduced, the number of lenses of the lens can be reduced, and the size can be reduced.

It will also be appreciated by those skilled in the art that the number of lenses constituting the optical imaging system can be varied to achieve the various results and advantages described in the present specification without departing from the claimed technical solutions. For example, although six lenses are exemplified in the embodiment, the optical imaging system is not limited to including six lenses. The optical imaging system may also include other numbers of lenses, if desired.

Specific examples of the optical imaging system that can be applied to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical imaging system according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application.

As shown in fig. 1, the optical imaging system includes, in order from the object side to the imaging side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and an imaging surface S15.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2, and both the object-side surface S1 and the image-side surface S2 of the first lens element E1 are spherical.

The second lens E2 has positive power, the object-side surface S3 is concave, the image-side surface S4 is convex, and both the object-side surface S3 and the image-side surface S4 of the second lens E2 are aspheric.

The third lens element E3 has positive optical power, and has a convex object-side surface S5 and a convex image-side surface S6, and both the object-side surface S5 and the image-side surface S6 of the third lens element E3 are aspheric.

The fourth lens E4 has negative power, and has a concave object-side surface S7, a concave image-side surface S8, and both the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are aspheric.

The fifth lens element E5 has positive optical power, and has a convex object-side surface S9, a convex image-side surface S10, and both the object-side surface S9 and the image-side surface S10 of the fifth lens element E5 are aspheric.

The sixth lens E6 has positive power, and has a convex object-side surface S11, a concave image-side surface S12, and both the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are aspheric.

Optionally, the optical imaging system may further include a filter E7 having an object-side surface S13 and an image-side surface S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In the optical imaging system of the present embodiment, a stop STO for limiting the light beam may also be provided between, for example, the second lens E2 and the third lens E3, so as to improve the imaging quality of the optical imaging system.

Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of example 1, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 1

As can be seen from table 1, the radius of curvature R7 of the object-side surface S7 of the fourth lens E4 and the radius of curvature R8 of the image-side surface S8 of the fourth lens satisfy R7/R8 of-2.03; the central thickness CT6 of the sixth lens element E6 on the optical axis and the central thickness CT1 of the first lens element E1 on the optical axis satisfy CT6/CT1 ═ 0.60; a distance T56 between the fifth lens E5 and the sixth lens E6 on the optical axis and a sum Σ AT of distances between any adjacent two lenses of the first lens E1 to the sixth lens E6 on the optical axis satisfy T56/Σ AT 0.29.

In the embodiment, six lenses are taken as an example, and by reasonably distributing the focal length of each lens, the surface type of each lens, the center thickness of each lens and the spacing distance between each lens, the miniaturization of the imaging system is ensured, and meanwhile, the field angle of the imaging system is enlarged, the resolution of the imaging system is improved, and the imaging quality of the imaging system is improved. In the present embodiment, 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 aspheric surface. Table 2 below gives the coefficients A of the higher-order terms that can be used for the aspherical mirrors S3-S12 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 gives effective focal lengths f1 to f6 of the respective lenses in the optical imaging system of embodiment 1, a total effective focal length f of the optical imaging system, and an optical total length TTL of the optical imaging system (i.e., a distance on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens E1).

Parameter(s)	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f5(mm)	f6(mm)
							Numerical value	-1.56	7.43	1.09	-1.17	2.48	7.44
Parameter(s)	f(mm)	TTL(mm)
							Numerical value	1.13	5.00

TABLE 3

As can be seen from table 3, the effective focal length f1 of the first lens E1 and the effective focal length f6 of the sixth lens E6 satisfy | f1/f6| ═ 0.21; f3/f5 of 0.44 is satisfied between the effective focal length f3 of the third lens E3 and the effective focal length f5 of the fifth lens E5; f/f2 is 0.15 between the total effective focal length f of the optical imaging system and the effective focal length f2 of the second lens E2; f/f4 is-0.97 between the total effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens E4. As can be seen from table 1 and table 3, f/| R3|, which is 0.14, is satisfied between the total effective focal length f of the optical imaging system and the radius of curvature R3 of the object-side surface of the second lens E2.

In the present embodiment, the maximum half field angle HFOV of the optical imaging system satisfies Tan (HFOV/2) ═ 0.99; f/f345 of 0.64 is satisfied between the total effective focal length f of the optical imaging system and the combined focal power f345 of the third lens E3, the fourth lens E4 and the fifth lens E5; the edge thickness ET6 of the sixth lens E6 at the maximum radius and the central thickness CT6 of the sixth lens E6 on the optical axis satisfy ET6/CT 6-1.18; the object-side surface S11 of the sixth lens E6 satisfies | SAG61|/CT6 ═ 0.74 between sagitta 61 at the maximum radius and the central thickness CT6 of the sixth lens E6 on the optical axis; the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy f/EPD equal to 2.1.

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

Example 2

An optical imaging system according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical imaging system according to embodiment 2 of the present application.

As shown in fig. 3, the optical imaging system includes, in order from the object side to the imaging side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and an imaging surface S15.

The sixth lens element E6 has positive optical power, and has a convex object-side surface S11 and a concave image-side surface S12, and both the object-side surface S11 and the image-side surface S12 of the sixth lens element E6 are aspheric.

Optionally, the optical imaging system may further include a filter E7 having an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In the optical imaging system of the present embodiment, a stop STO for limiting the light beam may also be provided between, for example, the second lens E2 and the third lens E3 to improve the imaging quality of the optical imaging system.

Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of example 2, wherein the units of the radius of curvature and the thickness are both millimeters (mm). Table 5 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1. Table 6 shows the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging system, and the total optical length TTL of the optical imaging system in the optical imaging system of embodiment 2.

TABLE 4

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S3

-1.2162E-01

1.8849E-01

-1.5211E+00

7.5199E+00

-2.2215E+01

4.0669E+01

-4.3886E+01

2.5016E+01

-5.3709E+00

S4

-3.4969E-01

5.4336E-01

-3.2627E+00

6.2363E+01

-6.0900E+02

3.2671E+03

-9.9395E+03

1.6140E+04

-1.0884E+04

S5

-2.0378E-01

3.2852E-02

1.0041E+00

-6.4533E+00

2.0050E+01

-2.0390E+01

-3.8759E+01

1.1667E+02

-7.7554E+01

S6

1.1024E+00

-1.5869E+01

1.1787E+02

-5.8169E+02

1.9839E+03

-4.5826E+03

6.8212E+03

-5.9036E+03

2.2676E+03

S7

1.2959E+00

-2.1182E+01

1.6181E+02

-8.2867E+02

2.9733E+03

-7.2782E+03

1.1485E+04

-1.0493E+04

4.2140E+03

S8

4.8189E-01

-9.8620E+00

7.7021E+01

-3.6649E+02

1.1380E+03

-2.3034E+03

2.9207E+03

-2.1028E+03

6.5468E+02

S9

-1.9894E-03

-2.7700E+00

2.5870E+01

-1.2059E+02

3.3379E+02

-5.6423E+02

5.6340E+02

-2.9658E+02

5.8853E+01

S10

-1.9917E-01

6.8777E-01

6.5421E-01

-8.1660E+00

2.9627E+01

-6.7880E+01

9.9202E+01

-8.0247E+01

2.6532E+01

S11

-4.6199E-01

3.7327E-01

-2.0280E-01

-1.5536E+00

5.0672E+00

-9.0639E+00

9.4133E+00

-5.0115E+00

8.6763E-01

S12

-1.9763E-01

-2.8461E-01

1.3506E+00

-3.4902E+00

5.8410E+00

-6.5492E+00

4.7350E+00

-1.9827E+00

3.6236E-01

TABLE 5

Parameter(s)	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f5(mm)	f6(mm)
							Numerical value	-1.67	12.13	1.28	-1.40	2.24	35.06
Parameter(s)	f(mm)	TTL(mm)
							Numerical value	1.20	6.00

TABLE 6

Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 2, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical system. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 2. Fig. 4C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 2, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system. Fig. 4D shows a relative illuminance curve of the optical imaging system of embodiment 2, which represents the relative illuminance corresponding to different image heights on the imaging surface. As can be seen from fig. 4A to 4D, the optical imaging system according to embodiment 2 can achieve good imaging quality.

Example 3

An optical imaging system according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic configuration diagram of an optical imaging system according to embodiment 3 of the present application.

As shown in fig. 5, the optical imaging system includes, in order from the object side to the imaging side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and an imaging surface S15.

The third lens E3 has positive optical power, and has a convex object-side surface S5, a convex image-side surface S6, and both the object-side surface S5 and the image-side surface S6 of the third lens E3 are aspheric.

The fourth lens E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8, and both the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are aspheric.

The fifth lens element E5 has positive optical power, and has a convex object-side surface S9 and a convex image-side surface S10, and both the object-side surface S9 and the image-side surface S10 of the fifth lens element E5 are aspheric.

The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12, and both the object-side surface S11 and the image-side surface S12 of the sixth lens element E6 are aspheric.

Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of example 3, wherein the unit of the radius of curvature and the thickness are both millimeters (mm). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3. Wherein each aspherical surface type can be defined by formula (1) given in embodiment 1 above. Table 9 shows the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging system, and the total optical length TTL of the optical imaging system in the optical imaging system of embodiment 3.

TABLE 7

TABLE 8

Parameter(s)	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f5(mm)	f6(mm)
							Numerical value	-2.04	16.47	1.09	-1.21	2.45	-28.16
Parameter(s)	f(mm)	TTL(mm)
							Numerical value	1.26	5.42

TABLE 9

Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 3, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical system. Fig. 6B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 3. Fig. 6C shows a chromatic aberration of magnification curve of the optical imaging system of embodiment 3, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system. Fig. 6D shows a relative illuminance curve of the optical imaging system of embodiment 3, which represents the relative illuminance corresponding to different image heights on the imaging surface. As can be seen from fig. 6A to 6D, the optical imaging system according to embodiment 3 can achieve good imaging quality.

Example 4

An optical imaging system 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 system according to embodiment 4 of the present application.

As shown in fig. 7, the optical imaging system includes, in order from the object side to the imaging side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and an imaging surface S15.

Table 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of example 4, wherein the unit of the radius of curvature and the thickness are both millimeters (mm). Table 11 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1. Table 12 shows effective focal lengths f1 to f6 of the respective lenses in the optical imaging system of embodiment 4, a total effective focal length f of the optical imaging system, and an optical total length TTL of the optical imaging system.

Watch 10

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S3

-9.8723E-02

-1.6030E-01

6.7445E-01

-7.5105E-02

-9.6099E+00

4.1525E+01

-8.2963E+01

8.2408E+01

-3.2719E+01

S4

-2.2667E-01

-1.2518E+00

3.9107E+01

-3.8552E+02

1.9682E+03

-4.6512E+03

1.1072E+03

1.3913E+04

-1.6819E+04

S5

-2.7251E-01

1.7208E+00

-2.5223E+01

3.2145E+02

-2.7804E+03

1.5109E+04

-4.9831E+04

9.0347E+04

-6.8610E+04

S6

1.9199E+00

-2.1534E+01

1.5776E+02

-9.1766E+02

4.1340E+03

-1.3392E+04

2.8173E+04

-3.3804E+04

1.7423E+04

S7

9.7723E-01

-1.4612E+01

8.1274E+01

-2.4446E+02

3.4300E+02

3.3224E+02

-3.0699E+03

7.1577E+03

-6.1190E+03

S8

-8.7971E-01

8.8871E+00

-6.5963E+01

3.3416E+02

-1.1297E+03

2.5532E+03

-3.7557E+03

3.2752E+03

-1.2864E+03

S9

-1.1781E+00

1.0465E+01

-6.0959E+01

2.5295E+02

-7.6055E+02

1.6531E+03

-2.4298E+03

2.1181E+03

-8.1690E+02

S10

-9.9933E-01

4.4231E+00

-2.5009E+01

1.2971E+02

-4.4886E+02

9.8722E+02

-1.3347E+03

1.0278E+03

-3.4830E+02

S11

-4.0599E-01

1.8400E+00

-1.7043E+01

6.4576E+01

-1.3202E+02

1.5895E+02

-1.1268E+02

4.3588E+01

-7.1141E+00

S12

3.1380E-01

-3.7091E+00

8.8798E+00

-1.2177E+01

1.0479E+01

-5.8431E+00

2.1001E+00

-4.4991E-01

4.3036E-02

TABLE 11

Parameter(s)	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f5(mm)	f6(mm)
							Numerical value	-2.04	14.36	0.85	-0.78	2.35	5.13
Parameter(s)	f(mm)	TTL(mm)
							Numerical value	1.06	5.35

TABLE 12

Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 4, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical system. Fig. 8B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 4. Fig. 8C shows a chromatic aberration of magnification curve of the optical imaging system of example 4, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system. Fig. 8D shows a relative illuminance curve of the optical imaging system of embodiment 4, which represents the relative illuminance corresponding to different image heights on the imaging surface. As can be seen from fig. 8A to 8D, the optical imaging system according to embodiment 4 can achieve good imaging quality.

Example 5

An optical imaging system 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 system according to embodiment 5 of the present application.

As shown in fig. 9, the optical imaging system includes, in order from the object side to the imaging side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and an imaging surface S15.

Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of example 5, wherein the unit of the radius of curvature and the thickness are both millimeters (mm). Table 14 shows high-order coefficient values that can be used for each aspherical mirror surface in example 5. Wherein each aspherical surface type can be defined by formula (1) given in embodiment 1 above. Table 15 shows effective focal lengths f1 to f6 of the respective lenses, a total effective focal length f of the optical imaging system, and an optical total length TTL of the optical imaging system in the optical imaging system of embodiment 5.

Watch 13

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S3

-1.1514E-01

-8.2836E-02

5.6436E-01

-2.7003E+00

8.9478E+00

-1.8649E+01

2.3647E+01

-1.6570E+01

4.9131E+00

S4

-2.8358E-01

3.8919E-01

-9.8077E-02

4.9521E+00

-5.1662E+01

2.1788E+02

-4.4709E+02

4.1895E+02

-1.2048E+02

S5

-1.3351E-01

4.6584E-01

-1.0582E+00

9.5335E-01

1.3738E+00

-6.8517E+00

1.2160E+01

-9.9216E+00

3.0296E+00

S6

3.4618E-01

-3.1393E+00

1.5483E+01

-4.5413E+01

7.6783E+01

-6.8273E+01

2.3364E+01

4.6909E+00

-3.8539E+00

S7

-4.2176E-01

-7.8134E-01

6.2939E+00

-6.1480E+00

-4.6416E+01

1.8219E+02

-2.8220E+02

2.0498E+02

-5.7620E+01

S8

-5.1492E-01

2.4199E+00

-9.0804E+00

2.9204E+01

-6.7946E+01

1.0419E+02

-9.7652E+01

4.9836E+01

-1.0439E+01

S9

-1.2224E-03

4.2957E-01

-1.8805E+00

4.4941E+00

-6.6836E+00

5.8956E+00

-2.7810E+00

5.2559E-01

9.9603E-03

S10

-1.7121E-01

4.5804E-01

-5.3934E-01

3.6806E-01

-1.6329E-01

4.8407E-02

-9.3029E-03

1.0475E-03

-5.2227E-05

S11

-2.9609E-01

-1.0103E+00

3.7338E+00

-6.3381E+00

6.3954E+00

-4.0020E+00

1.4989E+00

-3.0116E-01

2.3913E-02

S12

-5.6924E-01

6.8234E-01

-5.8200E-01

3.6829E-01

-2.1595E-01

1.1457E-01

-4.3746E-02

9.2694E-03

-7.8604E-04

TABLE 14

Parameter(s)	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f5(mm)	f6(mm)
							Numerical value	-2.04	10.80	1.18	-1.31	1.95	-5.33
Parameter(s)	f(mm)	TTL(mm)
							Numerical value	1.27	5.44

Watch 15

Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging system of example 5, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical system. Fig. 10B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 5. Fig. 10C shows a chromatic aberration of magnification curve of the optical imaging system of example 5, which represents the deviation of different image heights on the imaging plane of light rays after passing through the optical imaging system. Fig. 10D shows a relative illuminance curve of the optical imaging system of embodiment 5, which represents the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 10A to 10D, the optical imaging system according to embodiment 5 can achieve good imaging quality.

Example 6

An optical imaging system according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application.

As shown in fig. 11, the optical imaging system includes, in order from the object side to the imaging side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and an imaging surface S15.

The second lens E2 has positive power, and has a concave object-side surface S3, a convex image-side surface S4, and both the object-side surface S3 and the image-side surface S4 of the second lens E2 are aspheric.

Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of example 6, wherein the unit of the radius of curvature and the thickness are both millimeters (mm). Table 17 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1. Table 18 shows effective focal lengths f1 to f6 of the respective lenses in the optical imaging system of embodiment 6, a total effective focal length f of the optical imaging system, and an optical total length TTL of the optical imaging system.

TABLE 16

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S3

-2.3715E-01

2.8998E+00

-2.6937E+01

1.3984E+02

-4.4808E+02

9.0459E+02

-1.1174E+03

7.6919E+02

-2.2556E+02

S4

-2.9932E-01

6.5824E-01

1.3484E+00

-1.5908E+01

5.7242E+01

-1.0476E+02

1.0061E+02

-4.6554E+01

7.8041E+00

S5

-1.6956E-01

8.6321E-01

-2.5301E+00

5.1704E+00

-7.7453E+00

8.0878E+00

-5.3068E+00

1.9092E+00

-2.8297E-01

S6

4.6964E-01

-3.1061E+00

1.5383E+01

-5.3560E+01

1.1602E+02

-1.5163E+02

1.1667E+02

-4.8690E+01

8.4867E+00

S7

-3.8695E-01

-3.4158E-01

4.2379E-01

1.2263E+01

-5.6461E+01

1.2408E+02

-1.5043E+02

9.5195E+01

-2.4510E+01

S8

-1.7506E-01

-2.0675E+00

2.2967E+01

-1.1321E+02

3.3141E+02

-5.9955E+02

6.5802E+02

-4.0142E+02

1.0417E+02

S9

3.3849E-01

-5.4360E+00

3.3642E+01

-1.2139E+02

2.7687E+02

-4.0615E+02

3.6815E+02

-1.8596E+02

3.9829E+01

S10

1.8769E-01

-2.0154E+00

5.6205E+00

-6.9038E+00

4.5077E+00

-1.6984E+00

3.7220E-01

-4.4195E-02

2.2034E-03

S11

2.0394E-03

-1.8195E+00

4.8878E+00

-6.4893E+00

5.0780E+00

-2.4349E+00

7.0326E-01

-1.1222E-01

7.5704E-03

S12

2.4382E-02

-5.7384E-02

4.4179E-03

-4.8904E-05

-9.1623E-06

5.4041E-07

-1.3600E-08

1.6773E-10

-8.2752E-13

TABLE 17

Watch 18

Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging system of example 6, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical system. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 6. Fig. 12C shows a chromatic aberration of magnification curve of the optical imaging system of example 6, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system. Fig. 12D shows a relative illuminance curve of the optical imaging system of example 6, which represents the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 12A to 12D, the optical imaging system according to embodiment 6 can achieve good imaging quality.

Example 7

An optical imaging system according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic configuration diagram of an optical imaging system according to embodiment 7 of the present application.

As shown in fig. 13, the optical imaging system includes, in order from the object side to the imaging side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and an imaging surface S15.

Table 19 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of example 7, wherein the unit of the radius of curvature and the thickness are both millimeters (mm). Table 20 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1. Table 21 shows the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging system, and the total optical length TTL of the optical imaging system in the optical imaging system of embodiment 7.

Watch 19

Watch 20

Parameter(s)	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f5(mm)	f6(mm)
							Numerical value	-1.73	10.87	1.09	-1.16	2.45	20.88
Parameter(s)	f(mm)	TTL(mm)
							Numerical value	1.18	5.44

TABLE 21

Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging system of example 7, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical system. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 7. Fig. 14C shows a chromatic aberration of magnification curve of the optical imaging system of example 7, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging system. Fig. 14D shows a relative illuminance curve of the optical imaging system of embodiment 7, which represents the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 14A to 14D, the optical imaging system according to embodiment 7 can achieve good imaging quality.

Example 8

An optical imaging system according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 shows a schematic structural view of an optical imaging system according to embodiment 8 of the present application.

As shown in fig. 15, the optical imaging system includes, in order from the object side to the imaging side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and an imaging surface S15.

Table 22 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of example 7, wherein the unit of the radius of curvature and the thickness are both millimeters (mm). Table 23 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1. Table 24 shows the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging system, and the total optical length TTL of the optical imaging system in the optical imaging system of embodiment 7.

TABLE 22

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S3

-1.5918E-01

2.8836E-01

-2.7325E+00

1.4854E+01

-4.9213E+01

1.0160E+02

-1.2677E+02

8.7412E+01

-2.5524E+01

S4

-3.5919E-01

-3.4873E-01

3.0268E+01

-3.9473E+02

2.9508E+03

-1.3490E+04

3.7153E+04

-5.6584E+04

3.6637E+04

S5

-3.1217E-01

9.9000E-01

-4.4514E+00

3.1538E+01

-1.8405E+02

6.9557E+02

-1.5708E+03

1.9322E+03

-9.8005E+02

S6

1.0597E+00

-2.0461E+01

1.9097E+02

-1.1312E+03

4.4826E+03

-1.1857E+04

2.0110E+04

-1.9786E+04

8.6098E+03

S7

7.9566E-01

-1.9651E+01

1.7936E+02

-9.8665E+02

3.5902E+03

-8.7233E+03

1.3635E+04

-1.2413E+04

5.0196E+03

S8

-4.1116E-01

1.7073E-01

5.9658E+00

-1.6039E+01

-3.1252E+01

2.6325E+02

-6.1933E+02

6.7344E+02

-2.8823E+02

S9

-6.5934E-01

4.3844E+00

-2.7657E+01

1.4037E+02

-4.8685E+02

1.1080E+03

-1.5687E+03

1.2454E+03

-4.2294E+02

S10

-7.7501E-01

2.0958E+00

-1.8308E+00

-1.5266E+01

8.7968E+01

-2.2461E+02

3.1626E+02

-2.3342E+02

6.9816E+01

S11

-2.5321E-01

-7.4685E-01

2.5727E+00

-3.7881E+00

2.8476E+00

-3.3044E-01

-1.3088E+00

1.0667E+00

-2.8097E-01

S12

-6.2951E-01

7.1374E-02

1.5324E+00

-3.6715E+00

4.7435E+00

-3.8026E+00

1.8719E+00

-5.1646E-01

6.0864E-02

TABLE 23

Parameter(s)	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f5(mm)	f6(mm)
							Numerical value	-1.82	13.45	1.08	-1.16	2.43	26.53
Parameter(s)	f(mm)	TTL(mm)
							Numerical value	1.19	5.41

TABLE 24

Fig. 16A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 8, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical system. Fig. 16B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of example 8. Fig. 16C shows a chromatic aberration of magnification curve of the optical imaging system of example 8, which represents the deviation of different image heights on the imaging plane of light rays after passing through the optical imaging system. Fig. 16D shows a relative illuminance curve of the optical imaging system of example 8, which represents the relative illuminance corresponding to different image heights on the imaging plane. As can be seen from fig. 16A to 16D, the optical imaging system 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

The present application also provides an imaging device whose electron photosensitive element may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand-alone imaging apparatus such as a digital camera, or may be an imaging module integrated on a mobile electronic apparatus such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

The foregoing description is only exemplary of the preferred embodiments 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 system comprises, 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, a fifth lens, and a sixth lens, the number of lenses having optical power of the optical imaging system being six,

the first lens has negative 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 concave surface;

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

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

the fourth lens has negative 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 concave surface;

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

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

an effective focal length f3 of the third lens and an effective focal length f5 of the fifth lens satisfy 0 < f3/f5 < 0.8, and

the maximum half field angle HFOV of the optical imaging system meets the requirement that Tan (HFOV/2) is more than or equal to 0.9.

2. The optical imaging system of claim 1, wherein 0.5 < f/f345 < 0.9 is satisfied,

wherein f is the total effective focal length of the optical imaging system,

f345 is a combined focal length of the third lens, the fourth lens, and the fifth lens.

3. The optical imaging system of claim 1, wherein the total effective focal length f of the optical imaging system and the effective focal length f2 of the second lens satisfy f/f2 ≦ 0.2.

4. The optical imaging system of claim 1, wherein the total effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens satisfy-1.5 < f/f4 < -0.5.

5. The optical imaging system of claim 1, wherein an effective focal length f1 of the first lens and an effective focal length f6 of the sixth lens satisfy | f1/f6| < 0.5.

6. The optical imaging system of claim 1, wherein an edge thickness ET6 of the sixth lens at a maximum radius and a center thickness CT6 of the sixth lens on the optical axis satisfy 1 < ET6/CT6 < 2.

7. The optical imaging system of claim 1, wherein a sagittal SAG61 of the object-side surface of the sixth lens at the maximum radius and a central thickness CT6 of the sixth lens on the optical axis satisfy | SAG61|/CT6 < 1.

8. The optical imaging system of claim 1, wherein a central thickness CT6 of the sixth lens element on the optical axis and a central thickness CT1 of the first lens element on the optical axis satisfy 0.5 < CT6/CT1 < 1.0.

9. The optical imaging system of claim 1, wherein 0.1 < T56/∑ AT < 0.5 is satisfied,

wherein T56 is the air space between the fifth lens and the sixth lens on the optical axis,

Σ AT is the sum of the separation distances on the optical axis of any two adjacent lenses of the first lens to the sixth lens.

10. The optical imaging system of claim 1, wherein the total effective focal length f of the optical imaging system and a radius of curvature R3 of the object-side surface of the second lens satisfy f/| R3| < 0.3.

11. The optical imaging system of claim 1, wherein a radius of curvature R7 of the object-side surface of the fourth lens and a radius of curvature R8 of the image-side surface of the fourth lens satisfy-5.0 < R7/R8 < 0.

12. The optical imaging system of any of claims 1 to 11, wherein the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy f/EPD ≦ 2.2.

13. An optical imaging system having a total effective focal length f, the optical imaging system 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, a fifth lens, and a sixth lens, the number of lenses having optical power of the optical imaging system being six,

the combined focal power of the third lens, the fourth lens and the fifth lens is positive focal power;

a combined focal power f345 of the third lens, the fourth lens, and the fifth lens satisfies 0.5 < f/f345 < 0.9, and

14. The optical imaging system of claim 13, wherein an effective focal length f1 of the first lens and an effective focal length f6 of the sixth lens satisfy | f1/f6| < 0.5.

15. The optical imaging system of claim 13, wherein the total effective focal length f of the optical imaging system and the effective focal length f2 of the second lens satisfy f/f2 ≦ 0.2.

16. The optical imaging system of claim 14, wherein the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens satisfy 0 < f3/f5 < 0.8.

17. The optical imaging system of claim 13, wherein the total effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens satisfy-1.5 < f/f4 < -0.5.

18. The optical imaging system of claim 13, wherein an edge thickness ET6 of the sixth lens at a maximum radius and a center thickness CT6 of the sixth lens on the optical axis satisfy 1 < ET6/CT6 < 2.

19. The optical imaging system of claim 14, wherein a sagittal SAG61 of the object-side surface of the sixth lens at the maximum radius and a central thickness CT6 of the sixth lens on the optical axis satisfy | SAG61|/CT6 < 1.

20. The optical imaging system of claim 13, wherein a central thickness CT6 of the sixth lens element on the optical axis and a central thickness CT1 of the first lens element on the optical axis satisfy 0.5 < CT6/CT1 < 1.0.

21. The optical imaging system of claim 13, wherein 0.1 < T56/∑ AT < 0.5,

22. The optical imaging system of claim 13, wherein the total effective focal length f of the optical imaging system and the radius of curvature of the object-side surface of the second lens, R3, satisfy f/| R3| < 0.3.

23. The optical imaging system of claim 13, wherein a radius of curvature R7 of the object-side surface of the fourth lens and a radius of curvature R8 of the image-side surface of the fourth lens satisfy-5.0 < R7/R8 < 0.

24. The optical imaging system of claim 13, wherein the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy f/EPD ≦ 2.2.

25. An optical imaging system including, 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, a fifth lens, and a sixth lens having a refractive power, the number of the lenses having the refractive power of the optical imaging system being six,

a sagittal height SAG61 of an object-side surface of the sixth lens at a maximum radius and a central thickness CT6 of the sixth lens on the optical axis satisfy | SAG61|/CT6 < 1, an

26. The optical imaging system of claim 25, wherein the combined optical power of the third lens, the fourth lens, and the fifth lens is a positive optical power.

27. The optical imaging system of claim 26, wherein the total effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens satisfy-1.5 < f/f4 < -0.5.

28. The optical imaging system of claim 26, wherein the combined power f345 of the third lens, the fourth lens, and the fifth lens satisfies 0.5 < f/f345 < 0.9.

29. The optical imaging system of claim 27, wherein a radius of curvature R7 of the object-side surface of the fourth lens and a radius of curvature R8 of the image-side surface of the fourth lens satisfy-5.0 < R7/R8 < 0.

30. The optical imaging system of claim 25, wherein the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy f/EPD ≦ 2.2.

31. The optical imaging system of claim 30, wherein the total effective focal length f of the optical imaging system and the radius of curvature R3 of the object-side surface of the second lens satisfy f/| R3| < 0.3.

32. The optical imaging system of claim 30, wherein the total effective focal length f of the optical imaging system and the effective focal length f2 of the second lens satisfy f/f2 ≦ 0.2.

33. The optical imaging system of claim 30, wherein an effective focal length f1 of the first lens and an effective focal length f6 of the sixth lens satisfy | f1/f6| < 0.5.

34. The optical imaging system of claim 30, wherein an edge thickness ET6 of the sixth lens at a maximum radius and a center thickness CT6 of the sixth lens on the optical axis satisfy 1 < ET6/CT6 < 2.

35. The optical imaging system of claim 30, wherein a central thickness CT6 of the sixth lens element on the optical axis and a central thickness CT1 of the first lens element on the optical axis satisfy 0.5 < CT6/CT1 < 1.0.

36. The optical imaging system of claim 30, wherein 0.1 < T56/∑ AT < 0.5,