阅读说明：本技术 光学成像镜头 (Optical imaging lens ) 是由 高雪 闻人建科 戴付建 赵烈烽 于 2019-11-06 设计创作，主要内容包括：本申请公开了一种光学成像镜头,其中,光学成像镜头沿着光轴由物侧至像侧依序包括具有光焦度的第一透镜；具有光焦度的第二透镜；具有光焦度的第三透镜,其像侧面为凹面；具有光焦度的第四透镜；具有光焦度的第五透镜；具有光焦度的第六透镜；以及具有光焦度的第七透镜；其中,所述光学成像镜头的总有效焦距f与所述光学成像镜头的入瞳直径EPD满足：f/EPD<1.5；所述第一透镜的物侧面至所述光学成像镜头的成像面在所述光轴上的距离TTL与所述光学成像镜头的总有效焦距f满足：TTL/f≤1.1；以及所述第一透镜和所述第二透镜在所述光轴上的间隔距离T12与所述第二透镜在所述光轴上的中心厚度CT2满足：0.5<T12/CT2<1.0。(The application discloses an optical imaging lens, wherein the optical imaging lens comprises a first lens with focal power in order from an object side to an image side along an optical axis; a second lens having an optical power; a third lens having a refractive power, an image-side surface of which is concave; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having optical power; and a seventh lens having optical power; wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.5; the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and the total effective focal length f of the optical imaging lens meet the following requirements: TTL/f is less than or equal to 1.1; and a separation distance T12 between the first lens and the second lens on the optical axis and a center thickness CT2 of the second lens on the optical axis satisfy: 0.5< T12/CT2< 1.0.)

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

a first lens having an optical power;

a second lens having an optical power;

a third lens having a refractive power, an image-side surface of which is concave;

a fourth lens having an optical power;

a fifth lens having optical power;

a sixth lens having optical power; and

a seventh lens having optical power;

wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.5; the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and the total effective focal length f of the optical imaging lens meet the following requirements: TTL/f is less than or equal to 1.1; and a separation distance T12 between the first lens and the second lens on the optical axis and a center thickness CT2 of the second lens on the optical axis satisfy:

0.5<T12/CT2<1.0。

2. the optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy:

1.5<f1/f-f2/f<2.5。

3. the optical imaging lens of claim 1, wherein the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy:

0.3<(f6-f7)/(f3+f4)<1.0。

4. the optical imaging lens of claim 1, wherein a distance SD on the optical axis from a stop to an image side surface of the seventh lens in the optical imaging lens and a combined focal length f123 of the first lens, the second lens and the third lens satisfy:

0.3<SD/f123<0.8。

5. the optical imaging lens of claim 1, wherein the edge thickness ET1 of the first lens and the center thickness CT1 of the first lens on the optical axis satisfy:

0.2<ET1/CT1<0.7。

6. the optical imaging lens according to claim 1, wherein the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens and the edge thickness ET7 of the seventh lens satisfy:

0.3<ET2/(ET3+ET7)<0.8。

7. the optical imaging lens according to claim 1, wherein a sum Σ AT of a maximum effective radius DT11 of an object side surface of the first lens and a separation distance on the optical axis of any adjacent two lenses of the first lens to the seventh lens satisfies:

0.5<DT11/ΣAT<1.0。

8. the optical imaging lens according to claim 1, wherein an on-axis distance SAG11 from an intersection point of an object-side surface of the first lens and the optical axis to an effective radius vertex of an object-side surface of the first lens, an on-axis distance SAG22 from an intersection point of an image-side surface of the second lens and the optical axis to an effective radius vertex of an image-side surface of the second lens, and an on-axis distance SAG32 from an intersection point of an image-side surface of the third lens and the optical axis to an effective radius vertex of an image-side surface of the third lens satisfy:

0.2<SAG22/(SAG11+SAG32)<0.7。

9. the optical imaging lens of claim 1, wherein an on-axis distance from an intersection point of the image-side surface of the sixth lens and the optical axis to an effective radius vertex of the image-side surface of the sixth lens SAG62 and an intersection point of the object-side surface of the seventh lens and the optical axis to an effective radius vertex of the object-side surface of the seventh lens SAG71 satisfy:

0.7<SAG62/SAG71<1.2。

10. an optical imaging lens, in order from an object side to an image side along an optical axis, comprising:

a first lens having a positive refractive power, an object-side surface of which is convex;

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

a third lens having a refractive power, an image-side surface of which is concave;

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

a fifth lens having a refractive power, an image-side surface of which is concave;

a sixth lens having a positive refractive power, an object-side surface of which is convex; and

a seventh lens having optical power;

wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.5.

Technical Field

The application relates to the field of optical elements, in particular to an optical imaging lens.

Background

With the rapid development of portable electronic products such as mobile phones and tablet computers in recent years, people increasingly enjoy shooting functions. Meanwhile, on one hand, along with the continuous lightening and thinning of electronic products, the market requires the continuous miniaturization of the built-in optical imaging lens; on the other hand, with the popularization of large-size and high-pixel CMOS chips, portable electronic products with a camera function have made higher demands on the imaging quality of the optical imaging lens. Among the high quality imaging lens types that exist today, telephoto lenses and large aperture, wide-angle lenses are widely favored by consumers and electronic product manufacturers. However, an optical imaging lens having both telephoto and wide-angle characteristics is more popular among consumers and electronic manufacturers.

Disclosure of Invention

An aspect of the present application provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a first lens having an optical power; a second lens having an optical power; a third lens having a refractive power, an image-side surface of which is concave; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having optical power; and a seventh lens having optical power; wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.5; the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and the total effective focal length f of the optical imaging lens meet the following requirements: TTL/f is less than or equal to 1.1; and a separation distance T12 between the first lens and the second lens on the optical axis and a center thickness CT2 of the second lens on the optical axis satisfy: 0.5< T12/CT2< 1.0.

In one embodiment, the total effective focal length f of the optical imaging lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 1.5< f1/f-f2/f < 2.5.

In one embodiment, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy: 0.3< (f6-f7)/(f3+ f4) < 1.0.

In one embodiment, a distance SD on the optical axis from the stop to the image-side surface of the seventh lens in the optical imaging lens and a combined focal length f123 of the first lens, the second lens, and the third lens satisfy: 0.3< SD/f123< 0.8.

In one embodiment, the edge thickness ET1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: 0.2< ET1/CT1< 0.7.

In one embodiment, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens, and the edge thickness ET7 of the seventh lens satisfy: 0.3< ET2/(ET3+ ET7) < 0.8.

In one embodiment, a sum Σ AT of a maximum effective radius DT11 of an object-side surface of the first lens and a separation distance on the optical axis between any adjacent two lenses of the first lens to the seventh lens satisfies: 0.5< DT11/Σ AT < 1.0.

In one embodiment, an on-axis distance SAG11 from an intersection point of an object-side surface of the first lens and the optical axis to a vertex of an effective radius of an object-side surface of the first lens, an on-axis distance SAG22 from an intersection point of an image-side surface of the second lens and the optical axis to a vertex of an effective radius of an image-side surface of the second lens, and an on-axis distance SAG32 from an intersection point of an image-side surface of the third lens and the optical axis to a vertex of an effective radius of an image-side surface of the third lens satisfy: 0.2< SAG22/(SAG11+ SAG32) < 0.7.

In one embodiment, an on-axis distance SAG62 from an intersection point of an image-side surface of the sixth lens and the optical axis to an effective radius vertex of the image-side surface of the sixth lens to an on-axis distance SAG71 from an intersection point of an object-side surface of the seventh lens and the optical axis to an effective radius vertex of the object-side surface of the seventh lens satisfies: 0.7< SAG62/SAG71< 1.2.

In one embodiment, the radius of curvature R5 of the object-side surface of the third lens, the radius of curvature R6 of the image-side surface of the third lens, the radius of curvature R3 of the object-side surface of the second lens, and the radius of curvature R4 of the image-side surface of the second lens satisfy: 0.5< (R5+ R6)/(R3+ R4) < 1.0.

In one embodiment, a radius of curvature R7 of an object-side surface of the fourth lens, a radius of curvature R8 of an image-side surface of the fourth lens, and a radius of curvature R10 of an image-side surface of the fifth lens satisfy: 0.2< (R7+ R8)/R10< 0.7.

In one embodiment, a radius of curvature R11 of an object-side surface of the sixth lens and a radius of curvature R14 of an image-side surface of the seventh lens satisfy: 0.5< R11/(R11+ R14) < 1.0.

In one embodiment, a center thickness CT2 of the second lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, a center thickness CT7 of the seventh lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, and a center thickness CT6 of the sixth lens on the optical axis satisfy: 0.5< (CT2+ CT4+ CT5+ CT7)/(CT3+ CT6) < 1.0.

In one embodiment, the first lens has positive optical power and the object side surface is convex.

In one embodiment, the second lens has a negative power, and the object side surface is convex and the image side surface is concave.

In one embodiment, the fourth lens has a positive optical power, and the object side surface of the fourth lens is convex and the image side surface of the fourth lens is concave.

In one embodiment, the image side surface of the fifth lens is concave.

In one embodiment, the sixth lens has positive optical power and the object side surface is convex.

Another aspect of the present application provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a first lens having a positive refractive power, an object-side surface of which is convex; the second lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a third lens having a refractive power, an image-side surface of which is concave; a fourth lens with positive focal power, wherein the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; a fifth lens having a refractive power, an image-side surface of which is concave; a sixth lens having a positive refractive power, an object-side surface of which is convex; and a seventh lens having optical power; wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.5.

The optical imaging lens provided by the application comprises a plurality of lenses, such as a first lens to a seventh lens. The proportional relation between the total effective focal length of the optical imaging lens and the entrance pupil diameter of the optical imaging lens is reasonably set; the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis is in proportional relation with the total effective focal length of the optical imaging lens; and the proportional relation between the distance between the first lens and the second lens on the optical axis and the central thickness of the second lens on the optical axis, and the focal power and the surface type of each lens are optimized and reasonably matched with each other, so that the optical imaging lens has the characteristics of large aperture and long focus while realizing miniaturization and light weight.

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 structural view of an optical imaging lens according to embodiment 1 of the present application;

fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, 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 to 4D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, 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 to 6D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, 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 to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, 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 to 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, 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 to 12D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 6.

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 of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

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 a list of listed features, 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 features, principles, and other aspects of the present application are described in detail below.

An optical imaging lens according to an exemplary embodiment of the present application may include seven lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses are arranged in sequence from the object side to the image side along the optical axis. Each adjacent lens may have an air space therebetween.

In one embodiment, the first lens may have a positive optical power and the second lens may have a negative optical power. The reasonable setting of the focal power of the first lens and the second lens is beneficial to the reasonable control of the field angle of the long-focus optical system, the reduction of the incidence angle of light rays at the position of the diaphragm, the reduction of pupil aberration and the improvement of the imaging quality of the optical system. The image side surface of the third lens with the focal power is a concave surface, so that the spherical aberration and astigmatism of the optical system are reduced, and the imaging quality of the optical system is improved. The fourth lens may have a positive optical power, the fifth lens may have a positive optical power or a negative optical power, the sixth lens may have a positive optical power and the seventh lens may have a negative optical power. The focal power of the fourth lens to the seventh lens is reasonably set, so that the deflection angle of light rays can be reasonably controlled, the processing sensitivity of the optical system is reduced, and the relative illumination and the imaging quality of the optical system are improved.

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

In one embodiment, the second lens element has a convex object-side surface and a concave image-side surface.

In one embodiment, the fourth lens element has a convex object-side surface and a concave image-side surface.

In one embodiment, the image side surface of the fifth lens is concave.

In one embodiment, the object side surface of the sixth lens is convex. The convex-concave characteristic of the lens surface shape in the optical system is reasonably set, so that the incident angle of light rays at the position of the diaphragm is favorably reduced, the pupil aberration is reduced, and the relative illumination and the imaging quality of the optical system are improved.

In one embodiment, the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD <1.5, e.g., 1.3< f/EPD < 1.5. The proportional relation between the total effective focal length of the optical imaging lens and the entrance pupil diameter of the optical imaging lens is reasonably set, so that the optical system has enough light entering amount, and the imaging local image of the optical system is prevented from being blurred due to insufficient light when shooting is carried out in a dark environment.

In one embodiment, the distance TTL between the object side surface of the first lens element and the imaging surface of the optical imaging lens on the optical axis and the total effective focal length f of the optical imaging lens satisfy: TTL/f ≦ 1.1, e.g., 1.0 ≦ TTL/f ≦ 1.1. The proportional relation between the distance from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and the total effective focal length of the optical imaging lens is reasonably set, so that the optical system is favorable for having a large aperture and a long-focus characteristic.

In one embodiment, the first lens and the second lens are separated by a distance T12 on the optical axis and a center thickness CT2 of the second lens on the optical axis, which satisfy: 0.5< T12/CT2< 1.0. The proportional relation between the spacing distance of the first lens and the second lens on the optical axis and the central thickness of the second lens on the optical axis is reasonably set, and the chromatic dispersion of the optical system and the focus offset influenced by the lens spacing are favorably reduced.

In one embodiment, the total effective focal length f of the optical imaging lens, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 1.5< f1/f-f2/f <2.5, e.g., 1.5< f1/f-f2/f < 2.0. The mutual relation among the total effective focal length of the optical imaging lens, the effective focal length of the first lens and the effective focal length of the second lens is reasonably set, so that the optical imaging lens meets the conditions, the reasonable distribution of focal power is facilitated, the on-axis spherical aberration and the chromatic spherical aberration of the optical system are balanced, and the imaging quality of the optical system is improved.

In one embodiment, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy: 0.3< (f6-f7)/(f3+ f4) <1.0, for example, 0.4< (f6-f7)/(f3+ f4) < 0.7. The mutual relation among the effective focal length of the sixth lens, the effective focal length of the seventh lens, the effective focal length of the third lens and the effective focal length of the fourth lens is reasonably set to enable the mutual relation to meet the conditions, the spherical aberration contribution of the lenses is favorably controlled within a reasonable horizontal range, and the on-axis view field of the optical system obtains good imaging quality.

In one embodiment, a distance SD on an optical axis from the stop to the image side surface of the seventh lens in the optical imaging lens and a combined focal length f123 of the first lens, the second lens, and the third lens satisfy: 0.3< SD/f123<0.8, e.g., 0.4< SD/f123< 0.6. The ratio of the distance from the diaphragm to the image side surface of the seventh lens in the optical imaging lens on the optical axis to the combined focal length of the first lens, the second lens and the third lens is set within a reasonable numerical range, so that the deflection angle of light rays is favorably reduced, and the sensitivity of an optical system is reduced.

In one embodiment, the edge thickness ET1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: 0.2< ET1/CT1<0.7, e.g., 0.2< ET1/CT1< 0.4. The proportion relation between the edge thickness of the first lens and the center thickness of the first lens on the optical axis is reasonably set, so that the total length of the optical system is favorably reduced, the front end of the optical imaging lens is light and thin, and the processing sensitivity of the optical system is favorably reduced.

In one embodiment, the edge thickness ET2 of the second lens, the edge thickness ET3 of the third lens, and the edge thickness ET7 of the seventh lens satisfy: 0.3< ET2/(ET3+ ET7) < 0.8. The edge thickness of the second lens, the edge thickness of the third lens and the edge thickness of the seventh lens are reasonably set to be in mutual relation, so that the mutual relation meets the conditions, the total length of the optical system is favorably reduced, the front end of the optical imaging lens is light and thin, and the processing sensitivity of the optical system is favorably reduced.

In one embodiment, a sum Σ AT of a maximum effective radius DT11 of the object side surface of the first lens and a separation distance on the optical axis of any adjacent two lenses of the first lens to the seventh lens satisfies: 0.5< DT11/Σ AT <1.0, e.g., 0.8< DT11/Σ AT < 1.0. The proportional relation between the maximum effective radius of the object side surface of the first lens and the sum of the spacing distances of any two adjacent lenses from the first lens to the seventh lens on the optical axis is reasonably set, so that the field curvature, the on-axis spherical aberration and the chromatic spherical aberration of the optical imaging lens are favorably balanced, and the optical system has good imaging quality and lower system sensitivity, so that the optical imaging lens has good processability.

In one embodiment, an on-axis distance SAG11 from an intersection point of an object-side surface of the first lens and the optical axis to an effective radius vertex of the object-side surface of the first lens, an on-axis distance SAG22 from an intersection point of an image-side surface of the second lens and the optical axis to an effective radius vertex of the image-side surface of the second lens, and an on-axis distance SAG32 from an intersection point of an image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens satisfy: 0.2< SAG22/(SAG11+ SAG32) < 0.7. The axial distance from the intersection point of the object side surface of the first lens and the optical axis to the effective radius peak of the object side surface of the first lens, the axial distance from the intersection point of the image side surface of the second lens and the optical axis to the effective radius peak of the image side surface of the second lens and the axial distance from the intersection point of the image side surface of the third lens and the optical axis to the effective radius peak of the image side surface of the third lens are reasonably arranged, so that the mutual relation between the axial distance and the axial distance is met, the uniform distribution of the sizes of the lenses in the optical imaging lens is facilitated, the assembly stability of the lens is ensured, the aberration of the whole optical imaging lens is facilitated to be reduced, the total length of the optical imaging lens is shortened, and the processing difficulty of the lenses is.

In one embodiment, an on-axis distance SAG62 from an intersection point of an image-side surface of the sixth lens and the optical axis to an effective radius vertex of the image-side surface of the sixth lens and an on-axis distance SAG71 from an intersection point of an object-side surface of the seventh lens and the optical axis to an effective radius vertex of the object-side surface of the seventh lens satisfy: 0.7< SAG62/SAG71< 1.2. The ratio of the axial distance from the intersection point of the image side surface of the sixth lens and the optical axis to the effective radius peak of the image side surface of the sixth lens to the axial distance from the intersection point of the object side surface of the seventh lens and the optical axis to the effective radius peak of the object side surface of the seventh lens is set within a reasonable numerical range, so that the field curvature and the distortion of the optical imaging lens are favorably controlled within a reasonable range, and the imaging quality of an optical system is improved.

In one embodiment, the radius of curvature R5 of the object-side surface of the third lens, the radius of curvature R6 of the image-side surface of the third lens, the radius of curvature R3 of the object-side surface of the second lens, and the radius of curvature R4 of the image-side surface of the second lens satisfy: 0.5< (R5+ R6)/(R3+ R4) < 1.0. The mutual relation among the curvature radius of the object side surface of the third lens, the curvature radius of the image side surface of the third lens, the curvature radius of the object side surface of the second lens and the curvature radius of the image side surface of the second lens is reasonably set, so that the mutual relation meets the above conditions, the coma contribution rates of the two lenses are favorably controlled within a reasonable range, the coma generated by the front-end lens is better balanced, and the imaging quality of the optical system is improved.

In one embodiment, a radius of curvature R7 of the object-side surface of the fourth lens, a radius of curvature R8 of the image-side surface of the fourth lens, and a radius of curvature R10 of the image-side surface of the fifth lens satisfy: 0.2< (R7+ R8)/R10< 0.7. The mutual relation among the curvature radius of the object side surface of the fourth lens, the curvature radius of the image side surface of the fourth lens and the curvature radius of the image side surface of the fifth lens is reasonably set to meet the conditions, so that the thickness ratio trend of the aspheric surface of the fourth lens can be favorably controlled, and the aspheric surface of the fourth lens has good processing performance.

In one embodiment, a radius of curvature R11 of the object-side surface of the sixth lens and a radius of curvature R14 of the image-side surface of the seventh lens satisfy: 0.5< R11/(R11+ R14) < 1.0. The mutual relation between the curvature radius of the object side surface of the sixth lens and the curvature radius of the image side surface of the seventh lens is reasonably set, so that the mutual relation meets the conditions, the deflection angle of light rays in the optical system after passing through the sixth lens and the seventh lens is favorably controlled, and the CRA of the chip is better matched when the light rays of each field of view of the optical system reach an imaging surface.

In one embodiment, a central thickness CT2 of the second lens on the optical axis, a central thickness CT4 of the fourth lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, a central thickness CT7 of the seventh lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, and a central thickness CT6 of the sixth lens on the optical axis satisfy: 0.5< (CT2+ CT4+ CT5+ CT7)/(CT3+ CT6) < 1.0. The mutual relation of the central thicknesses of the lenses on the optical axis is reasonably set to meet the conditions, the space occupation ratio of the adjacent lenses in an optical system is favorably and reasonably distributed, the assembly manufacturability of the lenses is ensured, and the miniaturization of the optical imaging lens is realized.

In an exemplary embodiment, the optical imaging lens may further include a diaphragm. The diaphragm may be disposed at an appropriate position as required. For example, a diaphragm may be disposed between the first lens and the second lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element on the imaging surface.

The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the above seven lenses. Through reasonable distribution of focal power and optimal selection of high-order aspheric surface parameters, the optical imaging lens can meet the requirements of high imaging quality of an optical system, and can meet the requirements that the optical system has a large aperture and a certain telephoto characteristic.

In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspheric mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the seventh lens is an aspheric mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspheric mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens has an object-side surface and an image-side surface which are aspheric mirror surfaces.

The present application further provides an optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising: a first lens having a positive refractive power, an object-side surface of which is convex; the second lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a third lens having a refractive power, an image-side surface of which is concave; a fourth lens with positive focal power, wherein the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; a fifth lens having a refractive power, an image-side surface of which is concave; a sixth lens having a positive refractive power, an object-side surface of which is convex; and a seventh lens having optical power; wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 1.5.

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

Exemplary embodiments of the present application also provide an electronic apparatus including the above-described imaging device.

However, it will be appreciated by those skilled in the art that the number of lenses constituting an optical imaging lens 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 seven lenses are exemplified in the embodiment, the optical imaging lens is not limited to include seven 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.