CN211086753U - Optical imaging lens - Google Patents

Abstract

The application discloses an optical imaging lens, which sequentially comprises from an object side to an image side along an optical axis: a first lens having an optical power; a second lens having an optical power; a third lens having a negative optical power; a fourth lens having a positive optical power. Wherein, total effective focal length f of the optical imaging lens satisfies: f is more than 20mm and less than 30 mm.

Description

Optical imaging lens

Technical Field

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

Background

With the popularization of portable electronic products such as mobile phones and tablet computers, people have higher and higher requirements on imaging quality. Meanwhile, the current emerging dual-camera technology generally needs to use a telephoto lens to obtain a higher spatial and angular resolution.

In order to meet the market development requirements of portable electronic products such as mobile phones and tablet computers, the imaging lens needs to use as few lenses as possible to shorten the total length of the lens, but the design freedom is reduced, and the requirements of imaging quality are difficult to meet.

SUMMERY OF THE UTILITY MODEL

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; and a third lens having a negative optical power; a fourth lens having a positive optical power.

In one embodiment, the total effective focal length f of the optical imaging lens may satisfy: f is more than 20mm and less than 30 mm.

In one embodiment, the total effective focal length f of the optical imaging lens and the distance TT L between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis can satisfy TT L/f < 1.2.

In one embodiment, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the total effective focal length f of the optical imaging lens may satisfy: 0.1 < (f3+ f4)/f < 0.6.

In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R6 of the image-side surface of the third lens may satisfy: 0.3 < (R7-R6)/(R7+ R6) < 0.7.

In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens may satisfy: 0.1 < R1/R2 < 1.3.

In one embodiment, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the refractive index N3 of the third lens, and the refractive index N4 of the fourth lens may satisfy: 1.8 < (N1+ N2+ N3+ N4)/4 < 2.1.

In one embodiment, a separation distance T12 on the optical axis of the first lens and the second lens, a separation distance T23 on the optical axis of the second lens and the third lens, a separation distance T34 on the optical axis of the third lens and the fourth lens, a center thickness CT1 on the optical axis of the first lens, a center thickness CT2 on the optical axis of the second lens, and a center thickness CT3 on the optical axis of the third lens may satisfy: 0.2 < (T12+ T23+ T34)/(CT1+ CT2+ CT3) < 0.8.

In one embodiment, the optical imaging lens may further include a diaphragm, and a distance S L on the optical axis from the diaphragm to the imaging surface of the optical imaging lens and a distance TT L on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens may satisfy 0.8 < S L/TT L < 1.0.

In one embodiment, the distance BF L between the image side surface of the fourth lens 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 can satisfy 0.65 < BF L/f < 0.85.

In one embodiment, a distance SAG11 on the optical axis from the intersection point of the object-side surface of the first lens and the optical axis to the effective radius vertex of the object-side surface of the first lens, a distance SAG12 on the optical axis from the intersection point of the image-side surface of the first lens and the optical axis to the effective radius vertex of the image-side surface of the first lens, and a half ImgH of the diagonal length of the effective pixel region on the imaging surface of the optical imaging lens may satisfy: 0.4 < (SAG11+ SAG12)/ImgH < 1.3.

In one embodiment, a distance SAG41 on the optical axis from the intersection point of the object-side surface of the fourth lens and the optical axis to the effective radius vertex of the object-side surface of the fourth lens, a distance SAG42 on the optical axis from the intersection point of the image-side surface of the fourth lens and the optical axis to the effective radius vertex of the image-side surface of the fourth lens, and a center thickness CT4 on the optical axis of the fourth lens may satisfy: 0.5 < (SAG41-SAG42)/CT4 < 0.7.

In one embodiment, at least two lenses of the first to fourth lenses may be made of a glass material.

In one embodiment, the object side and the image side of at least two of the first to fourth lenses may be spherical.

In one embodiment, the maximum field angle FOV of the optical imaging lens may satisfy: FOV < 15 deg.

This application has adopted four lens, through the focal power of rational distribution each lens, face type, the center thickness of each lens and the epaxial interval between each lens etc for above-mentioned optical imaging lens has at least one beneficial effect such as extra long focal, high resolution, high imaging quality.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 shows a schematic structural view of an optical imaging lens according to embodiment 1 of the present application; fig. 2A to 2C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens of embodiment 1, respectively;

fig. 3 is a schematic structural view showing an optical imaging lens according to embodiment 2 of the present application; fig. 4A to 4C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens of embodiment 2, respectively;

fig. 5 is a schematic structural view showing an optical imaging lens according to embodiment 3 of the present application; fig. 6A to 6C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens of embodiment 3, respectively;

fig. 7 is a schematic structural view showing an optical imaging lens according to embodiment 4 of the present application; fig. 8A to 8C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens of embodiment 4, respectively;

fig. 9 is a schematic structural view showing an optical imaging lens according to embodiment 5 of the present application; fig. 10A to 10C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens of embodiment 5, respectively;

fig. 11 is a schematic structural view showing an optical imaging lens according to embodiment 6 of the present application; fig. 12A to 12C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens of embodiment 6, respectively;

fig. 13 is a schematic structural view showing an optical imaging lens according to embodiment 7 of the present application; fig. 14A to 14C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens of embodiment 7, 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 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, for example, four lenses having optical powers, respectively a first lens, a second lens, a third lens, and a fourth lens. The four lenses are arranged along the optical axis in sequence from the object side to the image side. Any adjacent two lenses of the first lens to the fourth lens can have a spacing distance therebetween.

In an exemplary embodiment, the third lens may have a negative power; the fourth lens may have a positive optical power.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: and f is more than 20mm and less than 30mm, wherein f is the total effective focal length of the optical imaging lens. More specifically, f further may satisfy: f is more than 26mm and less than 30 mm. F is more than 20mm and less than 30mm, which is beneficial to ensuring the miniaturization of the optical imaging lens and meeting the characteristic of super long focus of the optical imaging lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy TT L/f < 1.2, where f is a total effective focal length of the optical imaging lens, and TT L is a distance on an optical axis from an object side surface of the first lens to an imaging surface of the optical imaging lens, more specifically, TT L and f may further satisfy TT L/f < 1.1, satisfy TT L/f < 1.2, which is advantageous for ensuring miniaturization of the optical imaging lens, and a fitting conditional expression of 20mm < f < 30mm may realize a super long focus characteristic while ensuring miniaturization of the optical imaging lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.1 < (f3+ f4)/f < 0.6, wherein f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, and f is the total effective focal length of the optical imaging lens. More specifically, f3, f4, and f further satisfy: 0.2 < (f3+ f4)/f < 0.5. Satisfying 0.1 < (f3+ f4)/f < 0.6 can reasonably restrict the contribution amount of spherical aberration and coma aberration of the third lens and the fourth lens, thereby realizing reasonable sensitivity of the third lens and the fourth lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.3 < (R7-R6)/(R7+ R6) < 0.7, wherein R7 is the radius of curvature of the object-side surface of the fourth lens and R6 is the radius of curvature of the image-side surface of the third lens. Satisfying 0.3 < (R7-R6)/(R7+ R6) < 0.7, can effectively control the contribution of astigmatism of the object side surface of the fourth lens and the image side surface of the third lens, and further effectively and reasonably control the image quality of the middle view field and the aperture zone of the optical imaging lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.1 < R1/R2 < 1.3, wherein R1 is the radius of curvature of the object-side surface of the first lens, and R2 is the radius of curvature of the image-side surface of the first lens. More satisfy 0.1 < R1/R2 < 1.3, can restrain the shape of first lens effectively, and then can control the aberration contribution rate of the object side face and the image side face of first lens effectively, balance the optical imaging lens and the relevant aberration of aperture area, promote the formation of image quality of optical imaging lens.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.8 < (N1+ N2+ N3+ N4)/4 < 2.1, wherein N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, N3 is the refractive index of the third lens, and N4 is the refractive index of the fourth lens. More specifically, N1, N2, N3 and N4 may further satisfy: 1.8 < (N1+ N2+ N3+ N4)/4 < 2.0. Satisfy 1.8 < (N1+ N2+ N3+ N4)/4 < 2.1, can effectively distribute the focal power of each lens, satisfy optical imaging lens better image quality simultaneously, reach better temperature drift effect that disappears.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.2 < (T12+ T23+ T34)/(CT1+ CT2+ CT3) < 0.8, wherein T12 is a separation distance of the first lens and the second lens on the optical axis, T23 is a separation distance of the second lens and the third lens on the optical axis, T34 is a separation distance of the third lens and the fourth lens on the optical axis, CT1 is a center thickness of the first lens on the optical axis, CT2 is a center thickness of the second lens on the optical axis, and CT3 is a center thickness of the third lens on the optical axis. More specifically, T12, T23, T34, CT1, CT2, and CT3 further may satisfy: 0.25 < (T12+ T23+ T34)/(CT1+ CT2+ CT3) < 0.8. The requirement of 0.2 < (T12+ T23+ T34)/(CT1+ CT2+ CT3) < 0.8 is met, and the field curvature contribution of each field of view of the optical imaging lens can be in a reasonable range.

The optical imaging lens according to the present application may satisfy 0.8 < S L/TT L < 1.0, where S L is a distance on an optical axis from the stop to an imaging surface of the optical imaging lens and TT L is a distance on the optical axis from an object side surface of the first lens to the imaging surface of the optical imaging lens.

In an exemplary embodiment, the optical imaging lens according to the application can satisfy 0.65 < BF L/f < 0.85, wherein BF L is the distance between the image side surface of the fourth lens and the imaging surface of the optical imaging lens on the optical axis, and f is the total effective focal length of the optical imaging lens, and satisfy 0.65 < BF L/f < 0.85, the optical imaging lens can have an ultra-long back focus while having an ultra-long effective focal length, thereby facilitating the assembly of a lens post-module.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.4 < (SAG11+ SAG12)/ImgH < 1.3, wherein SAG11 is the distance on the optical axis from the intersection point of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens, SAG12 is the distance on the optical axis from the intersection point of the image side surface of the first lens and the optical axis to the effective radius vertex of the image side surface of the first lens, and ImgH is half the length of the diagonal of the effective pixel region on the imaging surface of the optical imaging lens. More specifically, SAG11, SAG12, and ImgH further satisfy: 0.4 < (SAG11+ SAG12)/ImgH < 1.25. The requirement of 0.4 < (SAG11+ SAG12)/ImgH is less than 1.3, so that the first lens can be prevented from being bent too much, the processing difficulty is further reduced, and the spherical aberration of the optical imaging lens is reduced; the total effective focal length of the optical imaging lens can be increased on the premise of ensuring the imaging quality of the optical imaging lens; the relative illumination of the optical imaging lens can be increased, and the imaging quality of the optical imaging lens in a dark environment is improved;

in an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.5 < (SAG41-SAG42)/CT4 < 0.7, wherein SAG41 is a distance on the optical axis from an intersection point of an object side surface of the fourth lens and the optical axis to an effective radius vertex of the object side surface of the fourth lens, SAG42 is a distance on the optical axis from an intersection point of an image side surface of the fourth lens and the optical axis to an effective radius vertex of the image side surface of the fourth lens, and CT4 is a central thickness of the fourth lens on the optical axis. Satisfying 0.5 < (SAG41-SAG42)/CT4 < 0.7 is beneficial to ensuring the processing, forming and assembling of the fourth lens so as to obtain good imaging quality. An unreasonable ratio may cause difficulty in adjusting the shape of the molding surface of the fourth lens, and the fourth lens is easily deformed after being assembled, so that the imaging quality cannot be ensured.

In an exemplary embodiment, at least two lenses of the first to fourth lenses may be lenses made of a glass material. Because the refractive index range of the glass material is wider and the selectivity is larger, the performance of the optical imaging lens can be effectively improved by using the glass material. Moreover, because the expansion coefficient of glass is smaller than that of plastic, the glass material used in the optical imaging lens can better play a role in eliminating temperature drift. Alternatively, each of the first to fourth lenses may be a lens made of a glass material.

In an exemplary embodiment, the object-side surfaces and the image-side surfaces of at least two lenses of the first to fourth lenses may be spherical surfaces, and the processing of the optical imaging lens may be facilitated and the processing cost may be reduced by setting the object-side surfaces and the image-side surfaces of at least two lenses of the first to fourth lenses to be spherical surfaces. Alternatively, the object-side surface and the image-side surface of each of the first lens to the fourth lens may be spherical surfaces.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: FOV < 15 deg., wherein FOV is the maximum field angle of the optical imaging lens. More specifically, the FOV may further satisfy: FOV < 12 deg. The FOV is less than 15 degrees, the focal length of the optical imaging lens can be ensured to be within a specific range, and the long-focus characteristic of the optical imaging lens is met. According to the application, the optical imaging lens can be matched with the short-focus wide-angle lens for use, so that a larger optical zooming multiple function is realized.

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 invention provides a four-piece type glass long-focus optical imaging lens group. By reasonably distributing the focal power and the surface type of each lens, the central thickness and the curvature radius of each lens, the on-axis distance between the lenses and the like, the optical imaging lens can be ensured to have the characteristics of long focus and high resolution while adopting less design freedom.

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 four lenses are exemplified in the embodiment, the optical imaging lens is not limited to include four lenses. The optical imaging lens may also include other numbers of lenses, if desired.

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

Example 1

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

As shown in fig. 1, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.

Table 1 shows a basic parameter table of the optical imaging lens of embodiment 1, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective half aperture are millimeters (mm).

TABLE 1

In this example, the total effective focal length f of the optical imaging lens is 28.20mm, the total length TT L of the optical imaging lens (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens) is 27.45mm, the half ImgH of the diagonal length of the effective pixel region on the imaging surface S11 of the optical imaging lens is 2.71mm, and the maximum angle of view FOV of the optical imaging lens is 11.0 °.

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

Example 2

An optical imaging lens according to embodiment 2 of the present application is described below with reference to fig. 3 to 4C. Fig. 3 shows a schematic structural diagram of an optical imaging lens according to embodiment 2 of the present application.

As shown in fig. 3, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.

In this example, the total effective focal length f of the optical imaging lens is 29.80mm, the total length TT L of the optical imaging lens is 28.00mm, the half ImgH of the diagonal length of the effective pixel region on the imaging plane S11 of the optical imaging lens is 2.71mm, and the maximum field angle FOV of the optical imaging lens is 10.4 °.

Table 2 shows a basic parameter table of the optical imaging lens of embodiment 2, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective half aperture are millimeters (mm).

TABLE 2

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

Example 3

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

As shown in fig. 5, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.

In this example, the total effective focal length f of the optical imaging lens is 28.10mm, the total length TT L of the optical imaging lens is 27.50mm, the half ImgH of the diagonal length of the effective pixel region on the imaging plane S11 of the optical imaging lens is 2.71mm, and the maximum field angle FOV of the optical imaging lens is 11.0 °.

Table 3 shows a basic parameter table of the optical imaging lens of embodiment 3, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective half aperture are millimeters (mm).

TABLE 3

Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 3. Fig. 6C shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 6A to 6C, the optical imaging lens according to embodiment 3 can achieve good imaging quality.

Example 4

An optical imaging lens according to embodiment 4 of the present application is described below with reference to fig. 7 to 8C. Fig. 7 shows a schematic structural diagram of an optical imaging lens according to embodiment 4 of the present application.

As shown in fig. 7, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.

In this example, the total effective focal length f of the optical imaging lens is 28.50mm, the total length TT L of the optical imaging lens is 28.00mm, the half ImgH of the diagonal length of the effective pixel region on the imaging plane S11 of the optical imaging lens is 2.71mm, and the maximum field angle FOV of the optical imaging lens is 10.9 °.

Table 4 shows a basic parameter table of the optical imaging lens of embodiment 4, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective half aperture are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness/distance	Material of	Refractive index	Abbe number	Focal length	Effective half caliber
									OBJ	Spherical surface	All-round	All-round
S1	Spherical surface	8.6201	1.1075	Glass	2.01	29.1	10.56	4.1858
									S2	Spherical surface	42.5226	0.2642					4.1158
S3	Spherical surface	-501.5770	0.8593	Glass	2.01	29.1	-1000.00	4.0884
									S4	Spherical surface	-1000.0000	0.0500					3.8861
STO	Spherical surface	All-round	0.0500					3.6672
									S5	Spherical surface	121.1125	3.1167	Glass	1.93	20.9	-7.35	3.8293
S6	Spherical surface	6.3966	2.1609					3.1105
									S7	Spherical surface	17.5331	0.6366	Glass	1.76	52.3	19.25	3.3574
S8	Spherical surface	-85.2452	1.8284					3.3570
									S9	Spherical surface	All-round	0.2100	Glass	1.52	64.2		3.5000
S10	Spherical surface	All-round	17.7164					3.5000
									S11	Spherical surface	All-round						2.7423

TABLE 4

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

Example 5

An optical imaging lens according to embodiment 5 of the present application is described below with reference to fig. 9 to 10C. Fig. 9 shows a schematic structural diagram of an optical imaging lens according to embodiment 5 of the present application.

As shown in fig. 9, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.

In this example, the total effective focal length f of the optical imaging lens is 28.50mm, the total length TT L of the optical imaging lens is 27.30mm, the half ImgH of the diagonal length of the effective pixel region on the imaging plane S11 of the optical imaging lens is 2.71mm, and the maximum field angle FOV of the optical imaging lens is 10.9 °.

Table 5 shows a basic parameter table of the optical imaging lens of embodiment 5, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective half aperture are all millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness/distance	Material of	Refractive index	Abbe number	Focal length	Effective half caliber
									OBJ	Spherical surface	All-round	All-round
S1	Spherical surface	8.1960	0.9938	Glass	2.01	29.1	13.24	4.3011
									S2	Spherical surface	19.9690	0.4893					4.2239
S3	Spherical surface	2347.5890	2.3887	Glass	2.01	29.1	-226.49	4.2043
									S4	Spherical surface	207.8145	0.0816					3.6668
STO	Spherical surface	All-round	0.1269					3.6029
									S5	Spherical surface	25.2321	0.8180	Glass	1.93	20.9	-9.63	3.4831
S6	Spherical surface	6.5091	0.5321					3.2156
									S7	Spherical surface	13.9757	0.6279	Glass	1.76	52.3	18.24	3.2252
S8	Spherical surface	-1200.0000	2.5691					3.2221
									S9	Spherical surface	All-round	0.2100	Glass	1.52	64.2		3.5000
S10	Spherical surface	All-round	18.4626					3.5000
									S11	Spherical surface	All-round						2.7342

TABLE 5

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

Example 6

An optical imaging lens according to embodiment 6 of the present application is described below with reference to fig. 11 to 12C. Fig. 11 shows a schematic structural view of an optical imaging lens according to embodiment 6 of the present application.

As shown in fig. 11, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.

In this example, the total effective focal length f of the optical imaging lens is 28.50mm, the total length TT L of the optical imaging lens is 27.90mm, the half ImgH of the diagonal length of the effective pixel region on the imaging plane S11 of the optical imaging lens is 2.71mm, and the maximum field angle FOV of the optical imaging lens is 10.9 °.

Table 6 shows a basic parameter table of the optical imaging lens of embodiment 6, in which the units of the radius of curvature, thickness/distance, focal length, and effective half aperture are millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness/distance	Material of	Refractive index	Abbe number	Focal length	Effective half caliber
									OBJ	Spherical surface	All-round	All-round
S1	Spherical surface	5.9874	1.7580	Glass	2.01	29.1	-279.02	4.2584
									S2	Spherical surface	4.9987	0.5778					3.5363
S3	Spherical surface	7.1866	0.8940	Glass	2.01	29.1	10.13	3.5322
									S4	Spherical surface	22.7898	0.3095					3.4580
STO	Spherical surface	All-round	0.1324					3.4014
									S5	Spherical surface	-69.8739	0.5466	Glass	1.93	20.9	-8.13	3.4094
S6	Spherical surface	8.5161	1.2943					3.2260
									S7	Spherical surface	33.8321	0.7025	Glass	1.76	52.3	16.53	3.3746
S8	Spherical surface	-19.6978	2.7908					3.3883
									S9	Spherical surface	All-round	0.2100	Glass	1.52	64.2		3.5000
S10	Spherical surface	All-round	18.6841					3.5000
									S11	Spherical surface	All-round						2.7199

TABLE 6

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

Example 7

An optical imaging lens according to embodiment 7 of the present application is described below with reference to fig. 13 to 14C. Fig. 13 is a schematic structural view showing an optical imaging lens according to embodiment 7 of the present application.

As shown in fig. 13, the optical imaging lens includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.

In this example, the total effective focal length f of the optical imaging lens is 27.50mm, the total length TT L of the optical imaging lens is 27.00mm, the half ImgH of the diagonal length of the effective pixel region on the imaging plane S11 of the optical imaging lens is 2.71mm, and the maximum field angle FOV of the optical imaging lens is 11.2 °.

Table 7 shows a basic parameter table of the optical imaging lens of embodiment 7, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective half aperture are millimeters (mm).

Flour mark	Surface type	Radius of curvature	Thickness/distance	Material of	Refractive index	Abbe number	Focal length	Effective half caliber
									OBJ	Spherical surface	All-round	All-round
S1	Spherical surface	8.9132	1.3511	Glass	2.01	29.1	10.83	4.1324
									S2	Spherical surface	45.0299	0.8634					3.9782
S3	Spherical surface	-12.3110	0.6428	Glass	2.01	29.1	380.45	3.9600
									S4	Spherical surface	-12.2404	0.0500					3.9255
STO	Spherical surface	All-round	0.0563					3.5338
									S5	Spherical surface	-1000.0000	1.9614	Glass	1.93	20.9	-7.73	3.5197
S6	Spherical surface	7.2538	1.2839					3.1122
									S7	Spherical surface	27.5568	0.6151	Glass	1.76	52.3	18.83	3.2267
S8	Spherical surface	-29.2817	1.9561					3.2348
									S9	Spherical surface	All-round	0.2100	Glass	1.52	64.2		3.5000
S10	Spherical surface	All-round	18.0099					3.5000
									S11	Spherical surface	All-round						2.7322

TABLE 7

Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 7, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 7. Fig. 14C shows a distortion curve of the optical imaging lens of embodiment 7, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 14A to 14C, the optical imaging lens according to embodiment 7 can achieve good imaging quality.

In summary, examples 1 to 7 each satisfy the relationship shown in table 8.

TABLE 8

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.

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

Claims (14)

1. The optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

a first lens having an optical power;

a second lens having an optical power;

a third lens having a negative optical power; and

a fourth lens having a positive optical power;

wherein the total effective focal length f of the optical imaging lens satisfies: f is more than 20mm and less than 30 mm.

2. The optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens and the distance TT L between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis satisfy TT L/f < 1.2.

3. The optical imaging lens of claim 1, wherein the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens and the total effective focal length f of the optical imaging lens satisfy: 0.1 < (f3+ f4)/f < 0.6.

4. The optical imaging lens of claim 1, wherein the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R6 of the image-side surface of the third lens satisfy: 0.3 < (R7-R6)/(R7+ R6) < 0.7.

5. The optical imaging lens of claim 1, wherein the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy: 0.1 < R1/R2 < 1.3.

6. The optical imaging lens of claim 1, wherein the refractive index N1 of the first lens, the refractive index N2 of the second lens, the refractive index N3 of the third lens and the refractive index N4 of the fourth lens satisfy: 1.8 < (N1+ N2+ N3+ N4)/4 < 2.1.

7. The optical imaging lens according to claim 1, wherein a separation distance T12 on the optical axis of the first lens and the second lens, a separation distance T23 on the optical axis of the second lens and the third lens, a separation distance T34 on the optical axis of the third lens and the fourth lens, a center thickness CT1 on the optical axis of the first lens, a center thickness CT2 on the optical axis of the second lens, and a center thickness CT3 on the optical axis of the third lens satisfy: 0.2 < (T12+ T23+ T34)/(CT1+ CT2+ CT3) < 0.8.

8. The optical imaging lens of claim 1, characterized in that the optical imaging lens further comprises a diaphragm,

the distance S L between the diaphragm and the imaging surface of the optical imaging lens on the optical axis and the distance TT L between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis satisfy 0.8 & lt S L/TT L & lt 1.0.

9. The optical imaging lens of claim 1, wherein a distance BF L between an image side surface of the fourth lens and an imaging surface of the optical imaging lens on the optical axis and a total effective focal length f of the optical imaging lens satisfy 0.65 < BF L/f < 0.85.

10. The optical imaging lens of claim 1, wherein a distance SAG11 on the optical axis from an intersection point of the 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, a distance SAG12 on the optical axis from an intersection point of the image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens, and a half ImgH of a diagonal length of an effective pixel region on an imaging surface of the optical imaging lens satisfy: 0.4 < (SAG11+ SAG12)/ImgH < 1.3.

11. The optical imaging lens of claim 1, wherein a distance SAG41 on the optical axis from an intersection point of an object-side surface of the fourth lens and the optical axis to an effective radius vertex of an object-side surface of the fourth lens, a distance SAG42 on the optical axis from an intersection point of an image-side surface of the fourth lens and the optical axis to an effective radius vertex of an image-side surface of the fourth lens, and a center thickness CT4 on the optical axis of the fourth lens satisfy: 0.5 < (SAG41-SAG42)/CT4 < 0.7.

12. The optical imaging lens according to any one of claims 1 to 11, characterized in that at least two lenses of the first to fourth lenses are made of a glass material.

13. The optical imaging lens according to any one of claims 1 to 11, characterized in that the object-side and image-side surfaces of at least two lenses of the first to fourth lenses are spherical.

14. The optical imaging lens according to any one of claims 1 to 11, wherein a maximum field angle FOV of the optical imaging lens satisfies: FOV < 15 deg.

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