Optical imaging lens

Abstract

The present application discloses an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens having positive optical power; a second lens having optical power; a third lens having negative optical power; a fourth lens having optical power; a fifth lens having optical power, the object-side surface of which is concave; and a sixth lens having optical power. The Semi-FOV, half of the maximum field of view (FOV), of the optical imaging lens satisfies the following conditions: 45° < Semi-FOV < 60°. The total effective focal length f of the optical imaging lens and the entrance pupil diameter (EPD) of the optical imaging lens satisfy the following conditions: f / EPD < 1.7. The total effective focal length f of the optical imaging lens and the curvature radius (R8) of the image-side surface of the fourth lens satisfy the following conditions: 0 < R8 / f < 0.7.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and in particular, to an optical imaging lens. Background Art

[0002] With the rapid development of portable electronic devices such as smartphones, their functionality is increasing, and users are demanding higher and higher standards for the appearance and performance of smartphones. Currently, users are increasingly demanding smartphones with larger screens, and under-screen fingerprint unlocking has become one of the main reasons for this demand. However, the under-screen imaging lenses currently available for under-screen fingerprint unlocking have poor light transmittance, failing to fully meet user needs. Summary of the Invention

[0003] On one hand, the present application provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens with optical power; a third lens with negative optical power; a fourth lens with optical power; a fifth lens with optical power, the object side surface of which is concave; and a sixth lens with optical power. Half of the maximum field of view (Semi-FOV) of the optical imaging lens can satisfy the following: 45°<Semi-FOV<60°. The total effective focal length f of the optical imaging lens and the entrance pupil diameter (EPD) of the optical imaging lens can satisfy the following: f / EPD<1.7. The total effective focal length f of the optical imaging lens and the curvature radius R8 of the image side surface of the fourth lens can satisfy the following: 0<R8 / f<0.7.

[0004] In one embodiment, there is at least one aspherical mirror surface from the object side surface of the first lens to the image side surface of the sixth lens.

[0005] In one embodiment, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens may satisfy: 0.3<(f5-f6) / (f2-f3)<0.8.

[0006] In one embodiment, a horizontal displacement SAG42 from the intersection 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 on the optical axis and an edge thickness ET4 of the fourth lens may satisfy: 0.5<SAG42 / ET4<1.0.

[0007] In one embodiment, the image-side surface of the sixth lens has at least one inflection point, and a vertical distance Yc62 from the inflection point to the optical axis and an edge thickness ET6 of the sixth lens may satisfy: 0.2<ET6 / Yc62<0.7.

[0008] In one embodiment, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, and the edge thickness ET3 of the third lens may satisfy: 0.5<ET3 / (ET1+ET2)<1.0.

[0009] In one embodiment, the combined focal length f12 of the first lens and the second lens and the combined focal length f45 of the fourth lens and the fifth lens may satisfy the following: 0.5<f45 / f12<1.0.

[0010] In one embodiment, the curvature radius R1 of the object side surface of the first lens, the curvature radius R2 of the image side surface of the first lens, the curvature radius R4 of the image side surface of the second lens, and the curvature radius R12 of the image side surface of the sixth lens may satisfy: 0.3<(R12-R4) / (R1+R2)<0.8.

[0011] In one embodiment, a curvature radius R7 of the object-side surface of the fourth lens, a curvature radius R8 of the image-side surface of the fourth lens, a curvature radius R9 of the object-side surface of the fifth lens, and a curvature radius R10 of the image-side surface of the fifth lens may satisfy: 0.3<(R7+R8) / (R10-R9)<1.3.

[0012] In one embodiment, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis may satisfy: 0.7<(CT1+CT2) / CT5<1.2.

[0013] In one embodiment, a center thickness CT4 of the fourth lens on the optical axis and a spacing distance T45 between the fourth lens and the fifth lens on the optical axis may satisfy: 0.3<CT4 / T45<0.8.

[0014] In one embodiment, the edge thickness ET5 of the fifth lens and the maximum effective radius DT52 of the image-side surface of the fifth lens may satisfy: 0.8<5×ET5 / DT52<1.3.

[0015] In one embodiment, the object-side surface of the first lens is convex and the image-side surface is concave; the second lens has positive optical power and its image-side surface is convex; the fifth lens has positive optical power and its image-side surface is convex; and the sixth lens has negative optical power and its image-side surface is concave.

[0016] In one embodiment, the distance TTL from the object-side surface of the first lens to the imaging plane of the optical imaging lens on the optical axis and half the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens ImgH may satisfy: TTL / ImgH<1.5.

[0017] On the other hand, the present application provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens with optical power; a third lens with negative optical power; a fourth lens with optical power; a fifth lens with optical power, whose object side surface is concave; and a sixth lens with optical power. Half of the maximum field of view angle Semi-FOV of the optical imaging lens can satisfy: 45°<Semi-FOV<60°. The horizontal displacement SAG42 on the optical axis from the intersection of the image side surface of the fourth lens and the optical axis to the vertex of the effective radius of the image side surface of the fourth lens and the edge thickness ET4 of the fourth lens can satisfy: 0.5<SAG42 / ET4<1.0.

[0018] In one embodiment, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens may satisfy: 0.3<(f5-f6) / (f2-f3)<0.8.

[0019] In one embodiment, the total effective focal length f of the optical imaging lens and the curvature radius R8 of the image-side surface of the fourth lens element may satisfy: 0<R8 / f<0.7.

[0020] In one embodiment, the image-side surface of the sixth lens has at least one inflection point, and a vertical distance Yc62 from the inflection point to the optical axis and an edge thickness ET6 of the sixth lens may satisfy: 0.2<ET6 / Yc62<0.7.

[0021] In one embodiment, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, and the edge thickness ET3 of the third lens may satisfy: 0.5<ET3 / (ET1+ET2)<1.0.

[0022] In one embodiment, the combined focal length f12 of the first lens and the second lens and the combined focal length f45 of the fourth lens and the fifth lens may satisfy the following: 0.5<f45 / f12<1.0.

[0023] In one embodiment, the curvature radius R1 of the object side surface of the first lens, the curvature radius R2 of the image side surface of the first lens, the curvature radius R4 of the image side surface of the second lens, and the curvature radius R12 of the image side surface of the sixth lens may satisfy: 0.3<(R12-R4) / (R1+R2)<0.8.

[0024] In one embodiment, a curvature radius R7 of the object-side surface of the fourth lens, a curvature radius R8 of the image-side surface of the fourth lens, a curvature radius R9 of the object-side surface of the fifth lens, and a curvature radius R10 of the image-side surface of the fifth lens may satisfy: 0.3<(R7+R8) / (R10-R9)<1.3.

[0025] In one embodiment, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis may satisfy: 0.7<(CT1+CT2) / CT5<1.2.

[0026] In one embodiment, a center thickness CT4 of the fourth lens on the optical axis and a spacing distance T45 between the fourth lens and the fifth lens on the optical axis may satisfy: 0.3<CT4 / T45<0.8.

[0027] In one embodiment, the edge thickness ET5 of the fifth lens and the maximum effective radius DT52 of the image-side surface of the fifth lens may satisfy: 0.8<5×ET5 / DT52<1.3.

[0028] In one embodiment, the object-side surface of the first lens is convex and the image-side surface is concave; the second lens has positive optical power and its image-side surface is convex; the fifth lens has positive optical power and its image-side surface is convex; and the sixth lens has negative optical power and its image-side surface is concave.

[0029] In one embodiment, the distance TTL from the object-side surface of the first lens to the imaging plane of the optical imaging lens on the optical axis and half the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens ImgH may satisfy: TTL / ImgH<1.5.

[0030] 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 may satisfy: f / EPD<1.7.

[0031] The present application provides an optical imaging lens suitable for portable electronic products by reasonably allocating optical focal length and optimizing optical parameters, which has ultra-thinness, miniaturization, large aperture and good imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0033] Figure 1 1 shows a schematic structural diagram of an optical imaging lens according to Example 1 of the present application;

[0034] Figures 2A to 2D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 1 are respectively shown;

[0035] Figure 3 1 shows a schematic structural diagram of an optical imaging lens according to Example 2 of the present application;

[0036] Figures 4A to 4D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 2 are respectively shown;

[0037] Figure 5 1 shows a schematic structural diagram of an optical imaging lens according to Example 3 of the present application;

[0038] 6A to 6D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 3 are respectively shown;

[0039] Figure 7 1 shows a schematic structural diagram of an optical imaging lens according to Example 4 of the present application;

[0040] Figures 8A to 8D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 4 are respectively shown;

[0041] Figure 9 1 shows a schematic structural diagram of an optical imaging lens according to Example 5 of the present application;

[0042] 10A to 10D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 5 are respectively shown;

[0043] Figure 11 shows a schematic structural diagram of an optical imaging lens according to Example 6 of the present application; and

[0044] 12A to 12D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens of Example 6 are respectively shown. DETAILED DESCRIPTION

[0045] 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 these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0046] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0047] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0048] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0049] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0050] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning 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 defined as such herein.

[0051] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] The features, principles and other aspects of the present application are described in detail below.

[0053] An optical imaging lens according to an exemplary embodiment of the present application may include six lenses having optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. These six lenses are arranged sequentially along the optical axis from the object side to the image side. Any two adjacent lenses among the first through sixth lenses may be spaced apart by a distance.

[0054] In an exemplary embodiment, the first lens may have positive optical power; the second lens may have positive optical power or negative optical power; the third lens may have negative optical power; the fourth lens may have positive optical power or negative optical power; the fifth lens may have positive optical power or negative optical power, and its object side surface may be concave; and the sixth lens may have positive optical power or negative optical power.

[0055] In an exemplary embodiment, by reasonably setting the optical power of each lens, the first lens with positive optical power and the third lens with negative optical power can effectively balance the spherical aberration of the optical imaging lens, reduce the low-order aberrations of the lens, and improve the imaging quality.

[0056] In an exemplary embodiment, the object-side surface of the first lens may be convex, and the image-side surface may be concave. The second lens may have positive optical power, and its image-side surface may be convex. This configuration of the optical power and surface shape of the first and second lenses facilitates a compact lens.

[0057] In an exemplary embodiment, the object side surface of the third lens may be convex, and the image side surface may be concave. This surface configuration of the third lens is conducive to diverging light, giving the lens a larger imaging surface, and at the same time helping to improve the illumination of the lens.

[0058] In an exemplary embodiment, the fifth lens element may have positive optical power and a convex image-side surface. The sixth lens element may have negative optical power and a concave image-side surface. This configuration of the optical power and surface shape of the fifth and sixth lenses effectively balances the positive and negative spherical aberrations generated by the two lenses. By properly allocating the optical power of each lens element, the aberrations of each lens element can be effectively balanced, ensuring excellent image quality.

[0059] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the following conditions: 45° < Semi-FOV < 60°, where the Semi-FOV is half the maximum field of view of the optical imaging lens. More specifically, the Semi-FOV may further satisfy the following conditions: 45° < Semi-FOV < 47°. This condition facilitates achieving a wide field of view.

[0060] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the following relationship: f / EPD < 1.7, where f is the total effective focal length of the optical imaging lens and EPD is the entrance pupil diameter of the optical imaging lens. Meeting f / EPD < 1.7 facilitates a larger aperture for the lens, thereby increasing the amount of light transmitted through the lens.

[0061] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the following conditions: 0 < R8 / f < 0.7, where f is the total effective focal length of the optical imaging lens and R8 is the radius of curvature of the image-side surface of the fourth lens element. More specifically, R8 and f may further satisfy the following conditions: 0.4 < R8 / f < 0.7. This 0 < R8 / f < 0.7 condition effectively controls the negative spherical aberration generated on the image-side surface of the fourth lens element, thereby minimizing aberrations in the lens.

[0062] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the following: 0.3 < (f5 - f6) / (f2 - f3) < 0.8, where f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. More specifically, f5, f6, f2, and f3 may further satisfy the following: 0.3 < (f5 - f6) / (f2 - f3) < 0.7. Satisfying 0.3 < (f5 - f6) / (f2 - f3) < 0.8 effectively controls the effective focal lengths of the second, third, fifth, and sixth lenses, and thereby effectively controls the contributions of the second, third, fifth, and sixth lenses to lens aberrations, thereby improving lens image quality.

[0063] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the following relationship: 0.5 < SAG42 / ET4 < 1.0, where SAG42 is the horizontal displacement on the optical axis from the intersection of the image-side surface of the fourth lens element and the optical axis to the vertex of the effective radius of the image-side surface of the fourth lens element, and ET4 is the edge thickness of the fourth lens element. More specifically, SAG42 and ET4 may further satisfy the following relationship: 0.5 < SAG42 / ET4 < 0.8. This relationship of 0.5 < SAG42 / ET4 < 1.0 effectively controls the shape of the fourth lens element, improves the processability of the lens, and significantly enhances the resolution of the optical imaging lens.

[0064] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy the following relationship: 0.2 < ET6 / Yc62 < 0.7, where Yc62 is the perpendicular distance from the inflection point on the image-side surface of the sixth lens element to the optical axis, and ET6 is the edge thickness of the sixth lens element. This 0.2 < ET6 / Yc62 < 0.7 requirement effectively controls the shape of the sixth lens element, improving its processability and controlling light distribution, enabling better lens compatibility with chips.

[0065] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the following: 0.5 < ET3 / (ET1 + ET2) < 1.0, where ET1 is the edge thickness of the first lens element, ET2 is the edge thickness of the second lens element, and ET3 is the edge thickness of the third lens element. More specifically, ET3, ET1, and ET2 may further satisfy the following: 0.5 < ET3 / (ET1 + ET2) < 0.9. This 0.5 < ET3 / (ET1 + ET2) < 1.0 requirement effectively controls the shapes of the first, second, and third lenses, ensuring lens processability and improving image quality at the edges of the field of view.

[0066] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the following: 0.5 < f45 / f12 < 1.0, where f12 is the combined focal length of the first and second lenses, and f45 is the combined focal length of the fourth and fifth lenses. More specifically, f45 and f12 may further satisfy the following: 0.6 < f45 / f12 < 0.9. This 0.5 < f45 / f12 < 1.0 requirement allows for optimal distribution of the focal power of each lens, effectively offsetting the positive and negative spherical aberrations generated by the front and rear lenses.

[0067] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the following relationship: 0.3 < (R12 - R4) / (R1 + R2) < 0.8, where R1 is the radius of curvature of the object-side surface of the first lens element, R2 is the radius of curvature of the image-side surface of the first lens element, R4 is the radius of curvature of the image-side surface of the second lens element, and R12 is the radius of curvature of the image-side surface of the sixth lens element. Satisfying 0.3 < (R12 - R4) / (R1 + R2) < 0.8 effectively balances the spherical aberration generated by the first, second, and sixth lenses, reducing their contribution to lens spherical aberration.

[0068] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.3<(R7+R8) / (R10-R9)<1.3, wherein R7 is the radius of curvature of the object side surface of the fourth lens, R8 is the radius of curvature of the image side surface of the fourth lens, R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens. More specifically, R7, R8, R10, and R9 may further satisfy: 0.5<(R7+R8) / (R10-R9)<1.2. Satisfying 0.3<(R7+R8) / (R10-R9)<1.3 can effectively control the shapes of the fourth and fifth lenses, and further effectively control the refraction angles of the light beams in the fourth and fifth lenses, achieving good processability and better matching of the lens with the chip.

[0069] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the following relationship: 0.7 < (CT1 + CT2) / CT5 < 1.2, where CT1 is the center thickness of the first lens element on the optical axis, CT2 is the center thickness of the second lens element on the optical axis, and CT5 is the center thickness of the fifth lens element on the optical axis. More specifically, CT1, CT2, and CT5 may further satisfy the following relationship: 0.8 < (CT1 + CT2) / CT5 < 1.1. This 0.7 < (CT1 + CT2) / CT5 < 1.2 requirement helps reduce the contribution of the first, second, and fifth lenses to the lens's curvature of field, resulting in better image quality.

[0070] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the following relationship: 0.3 < CT4 / T45 < 0.8, where CT4 is the center thickness of the fourth lens element on the optical axis, and T45 is the distance between the fourth and fifth lenses on the optical axis. More specifically, CT4 and T45 may further satisfy the following relationship: 0.4 < CT4 / T45 < 0.7. This 0.3 < CT4 / T45 < 0.8 effectively reduces the impact of the center thickness of the fourth lens element and the distance between the fourth and fifth lenses on lens sensitivity, thereby improving the imaging performance of the lens.

[0071] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the following conditions: 0.8 < 5 × ET5 / DT52 < 1.3, where ET5 is the edge thickness of the fifth lens element, and DT52 is the maximum effective radius of the image-side surface of the fifth lens element. More specifically, ET5 and DT52 may further satisfy the following conditions: 0.8 < 5 × ET5 / DT52 < 1.1. This condition effectively controls the shape of the fifth lens element, improves lens processability, facilitates lens molding and assembly, and enhances lens performance.

[0072] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy the following relationship: TTL / ImgH < 1.5, where TTL is the distance on the optical axis from the object-side surface of the first lens element to the imaging plane of the optical imaging lens, and ImgH is half the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens. Meeting TTL / ImgH < 1.5 facilitates compactness and miniaturization of the lens, thus meeting market demands.

[0073] In an exemplary embodiment, the optical imaging lens according to the present application further includes an aperture provided between the object side and the first lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The present application proposes an optical imaging lens having the characteristics of miniaturization, large aperture, ultra-thinness, and high imaging quality. The optical imaging lens according to the above embodiment of the present application may adopt multiple lenses, such as the six lenses mentioned above. By reasonably allocating the optical power, surface shape, center thickness of each lens, and axial spacing between each lens, etc., the incident light can be effectively converged, the total optical length of the imaging lens can be reduced, and the processability of the imaging lens can be improved, making the optical imaging lens more conducive to production and processing.

[0074] In an embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the sixth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all aspherical mirror surfaces.

[0075] However, those skilled in the art will appreciate that the number of lenses comprising the optical imaging lens can be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while six lenses are described in the embodiments, the optical imaging lens is not limited to six lenses. If desired, the optical imaging lens may also include other numbers of lenses.

[0076] Specific embodiments of the optical imaging lens applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0077] Example 1

[0078] The following reference Figures 1 to 2D The optical imaging lens according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical imaging lens according to Example 1 of the present application is shown.

[0079] like Figure 1As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0080] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative focal power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from an object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0081] Table 1 shows the basic parameters of the optical imaging lens of Example 1, wherein the units of curvature radius, thickness / distance and focal length are all millimeters (mm).

[0082]

[0083] Table 1

[0084] In this example, the total effective focal length f of the optical imaging lens is 2.83 mm, the total length TTL of the optical imaging lens (i.e., the distance from the object-side surface S1 of the first lens element E1 to the imaging surface S15 of the optical imaging lens on the optical axis) is 4.20 mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging lens is 3.04 mm, the ratio f / EPD of the total effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is 1.64, and the Semi-FOV (half of the maximum field of view) of the optical imaging lens is 46.1°.

[0085] In Example 1, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape of each aspherical lens is The following aspheric formulas can be used for definition, but are not limited to:

[0086] (1)

[0087] in, Aspheric surface along the optical axis at a height of h When the position is , the distance from the vertex of the aspherical surface is high; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai Aspheric i -th order correction coefficient. Tables 2-1 and 2-2 below give the high-order coefficients that can be used for each aspherical mirror surface S1-S12 in Example 1 A 4 、 A 6 、 A 8 、 A 10 、 A 12 、 A 14 、 A 16 、 A 18 、 A 20 、 A 22 、 A 24 、 A 26 、 A 28 and A 30 .

[0088]

[0089] Table 2-1

[0090]

[0091] Table 2-2

[0092] Figure 2A The axial chromatic aberration curve of the optical imaging lens of Example 1 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 2B The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 2C The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Figure 2D The chromatic aberration curve of the optical imaging lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 2A to 2D It can be seen that the optical imaging lens provided in Example 1 can achieve good imaging quality.

[0093] Example 2

[0094] The following reference Figures 3 to 4D The optical imaging lens according to Example 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Example 1 will be omitted. Figure 3 A schematic structural diagram of an optical imaging lens according to Example 2 of the present application is shown.

[0095] like Figure 3 As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0096] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0097] In this example, the total effective focal length f of the optical imaging lens is 2.83 mm, the total length TTL of the optical imaging lens is 4.22 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging lens is 3.04 mm, the ratio f / EPD of the total effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is 1.64, and half of the maximum field of view Semi-FOV of the optical imaging lens is 46.2°.

[0098] Table 3 shows the basic parameters of the optical imaging lens of Example 2, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Tables 4-1 and 4-2 show the high-order coefficients of the various aspherical mirror surfaces that can be used in Example 2, where the surface shapes of the various aspherical surfaces can be defined by formula (1) given in Example 1 above.

[0099]

[0100] Table 3

[0101]

[0102] Table 4-1

[0103]

[0104] Table 4-2

[0105] Figure 4A The axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 4B The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 4C The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Figure 4D The chromatic aberration curve of the optical imaging lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 4A to 4D It can be seen that the optical imaging lens provided in Example 2 can achieve good imaging quality.

[0106] Example 3

[0107] The following reference Figures 5 to 6D An optical imaging lens according to Example 3 of the present application is described. Figure 5 A schematic structural diagram of an optical imaging lens according to Example 3 of the present application is shown.

[0108] like Figure 5 As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0109] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from an object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0110] In this example, the total effective focal length f of the optical imaging lens is 2.83 mm, the total length TTL of the optical imaging lens is 4.22 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging lens is 3.04 mm, the ratio f / EPD of the total effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is 1.64, and half of the maximum field of view Semi-FOV of the optical imaging lens is 46.2°.

[0111] Table 5 shows the basic parameters of the optical imaging lens of Example 3, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Tables 6-1 and 6-2 show the high-order coefficients of the various aspherical mirror surfaces that can be used in Example 3, where the surface shapes of the various aspherical surfaces can be defined by formula (1) given in Example 1 above.

[0112]

[0113] Table 5

[0114]

[0115] Table 6-1

[0116]

[0117] Table 6-2

[0118] Figure 6A The axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 6B The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 6C The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion values ​​corresponding to different field angles. Figure 6D The chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 6A to 6D It can be seen that the optical imaging lens provided in Example 3 can achieve good imaging quality.

[0119] Example 4

[0120] The following reference Figures 7 to 8D An optical imaging lens according to Example 4 of the present application is described. Figure 7 A schematic structural diagram of an optical imaging lens according to Example 4 of the present application is shown.

[0121] like Figure 7As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0122] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative focal power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from an object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0123] In this example, the total effective focal length f of the optical imaging lens is 2.83 mm, the total length TTL of the optical imaging lens is 4.22 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging lens is 3.04 mm, the ratio f / EPD of the total effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is 1.64, and half of the maximum field of view Semi-FOV of the optical imaging lens is 46.2°.

[0124] Table 7 shows the basic parameters of the optical imaging lens of Example 4, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Tables 8-1 and 8-2 show the high-order coefficients of the various aspherical mirror surfaces that can be used in Example 4, where the surface shapes of the various aspherical surfaces can be defined by formula (1) given in Example 1 above.

[0125]

[0126] Table 7

[0127]

[0128] Table 8-1

[0129]

[0130] Table 8-2

[0131] Figure 8A The axial chromatic aberration curve of the optical imaging lens of Example 4 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 8BThe astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 8C The distortion curve of the optical imaging lens of Example 4 is shown, which represents the distortion values ​​corresponding to different field angles. Figure 8D The chromatic aberration curve of the optical imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 8A to 8D It can be seen that the optical imaging lens provided in Example 4 can achieve good imaging quality.

[0132] Example 5

[0133] The following reference Figures 9 to 10D An optical imaging lens according to Example 5 of the present application is described. Figure 9 A schematic structural diagram of an optical imaging lens according to Example 5 of the present application is shown.

[0134] like Figure 9 As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0135] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative focal power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0136] In this example, the total effective focal length f of the optical imaging lens is 2.83 mm, the total length TTL of the optical imaging lens is 4.22 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging lens is 3.04 mm, the ratio f / EPD of the total effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is 1.64, and half of the maximum field of view Semi-FOV of the optical imaging lens is 46.2°.

[0137] Table 9 shows the basic parameters of the optical imaging lens of Example 5, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Tables 10-1 and 10-2 show the high-order coefficients of the various aspherical mirror surfaces that can be used in Example 5, where the surface shapes of the various aspherical surfaces can be defined by formula (1) given in Example 1 above.

[0138]

[0139] Table 9

[0140]

[0141] Table 10-1

[0142]

[0143] Table 10-2

[0144] Figure 10A The axial chromatic aberration curve of the optical imaging lens of Example 5 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 10B The astigmatism curve of the optical imaging lens of Example 5 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 10C The distortion curve of the optical imaging lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Figure 10D The chromatic aberration curve of the optical imaging lens of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 10A to 10D It can be seen that the optical imaging lens provided in Example 5 can achieve good imaging quality.

[0145] Example 6

[0146] The following reference Figures 11 to 12D An optical imaging lens according to Example 6 of the present application is described. Figure 11 A schematic structural diagram of an optical imaging lens according to Example 6 of the present application is shown.

[0147] like Figure 11 As shown, the optical imaging lens includes, from the object side to the image side, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7 and an imaging surface S15.

[0148] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative focal power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is ultimately imaged on the imaging surface S15.

[0149] In this example, the total effective focal length f of the optical imaging lens is 2.83 mm, the total length TTL of the optical imaging lens is 4.22 mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging lens is 3.04 mm, the ratio f / EPD of the total effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is 1.64, and half of the maximum field of view Semi-FOV of the optical imaging lens is 46.2°.

[0150] Table 11 shows the basic parameters of the optical imaging lens of Example 6, where the units of curvature radius, thickness / distance, and focal length are all in millimeters (mm). Tables 12-1 and 12-2 show the high-order coefficients of the various aspheric mirror surfaces that can be used in Example 6, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0151]

[0152] Table 11

[0153]

[0154] Table 12-1

[0155]

[0156] Table 12-2

[0157] Figure 12A The axial chromatic aberration curve of the optical imaging lens of Example 6 is shown, which indicates the deviation of the focal point of light of different wavelengths passing through the lens. Figure 12B The astigmatism curve of the optical imaging lens of Example 6 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 12C The distortion curve of the optical imaging lens of Example 6 is shown, which represents the distortion values ​​corresponding to different field angles. Figure 12DThe chromatic aberration curve of the optical imaging lens of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. 12A to 12D It can be seen that the optical imaging lens provided in Example 6 can achieve good imaging quality.

[0158] In summary, Examples 1 to 6 can respectively satisfy the relationships shown in Table 13.

[0159]

[0160] Table 13

[0161] This application also provides an imaging device, whose electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0162] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to technical solutions formed by a specific combination of the aforementioned technical features. It also encompasses other technical solutions formed by any combination of the aforementioned technical features or their equivalents, without departing from the inventive concept. For example, a technical solution formed by replacing the aforementioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, characterized in that: Along the optical axis from the object side to the image side, they include: The first lens has positive refractive power, its object-side surface is convex and its image-side surface is concave; a second lens having positive refractive power and a convex image-side surface; a third lens having negative optical power; a fourth lens element having optical power, the object-side surface of which is convex and the image-side surface of which is concave; a fifth lens element having positive optical power, the object-side surface of which is concave and the image-side surface of which is convex; and a sixth lens element having negative optical power and a concave image-side surface; The optical imaging lens has six lenses with optical power. Half of the maximum field of view (Semi-FOV) of the optical imaging lens satisfies the following conditions: 45°<Semi-FOV≤46.2°; The total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy the following conditions: 1.64≤f / EPD<1.7; The total effective focal length f of the optical imaging lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0.48≤R8 / f≤0.63; and The horizontal displacement SAG42 from the intersection 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 on the optical axis and the edge thickness ET4 of the fourth lens satisfy: 0.5<SAG42 / ET4≤0.

66.

2. The optical imaging lens according to claim 1, wherein: The effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy the following: 0.40≤(f5-f6) / (f2-f3)≤0.

65.

3. The optical imaging lens according to claim 1, wherein: The image-side surface of the sixth lens has at least one inflection point, and a vertical distance Yc62 from the inflection point to the optical axis and an edge thickness ET6 of the sixth lens satisfy: 0.27≤ET6 / Yc62≤0.

58.

4. The optical imaging lens according to claim 1, wherein: An edge thickness ET1 of the first lens, an edge thickness ET2 of the second lens, and an edge thickness ET3 of the third lens satisfy the following: 0.57≤ET3 / (ET1+ET2)<0.

9.

5. The optical imaging lens according to claim 1, wherein: A combined focal length f12 of the first lens and the second lens and a combined focal length f45 of the fourth lens and the fifth lens satisfy the following: 0.73≤f45 / f12≤0.

84.

6. The optical imaging lens according to claim 1, wherein: A curvature radius R1 of the object-side surface of the first lens, a curvature radius R2 of the image-side surface of the first lens, a curvature radius R4 of the image-side surface of the second lens, and a curvature radius R12 of the image-side surface of the sixth lens satisfy the following conditions: 0.37≤(R12-R4) / (R1+R2)≤0.

73.

7. The optical imaging lens according to claim 1, wherein: A curvature radius R7 of the object-side surface of the fourth lens, a curvature radius R8 of the image-side surface of the fourth lens, a curvature radius R9 of the object-side surface of the fifth lens, and a curvature radius R10 of the image-side surface of the fifth lens satisfy: 0.59≤(R7+R8) / (R10-R9)≤1.

09.

8. The optical imaging lens according to claim 1, wherein: A center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT5 of the fifth lens on the optical axis satisfy: 0.89≤(CT1+CT2) / CT5≤1.

02.

9. The optical imaging lens according to claim 1, wherein: A center thickness CT4 of the fourth lens on the optical axis and a distance T45 between the fourth lens and the fifth lens on the optical axis satisfy the following: 0.50≤CT4 / T45≤0.

61.

10. The optical imaging lens according to claim 1, wherein: The edge thickness ET5 of the fifth lens and the maximum effective radius DT52 of the image-side surface of the fifth lens satisfy the following: 0.93≤5×ET5 / DT52≤1.

02.

11. The optical imaging lens according to any one of claims 1 to 10, wherein: A distance TTL from the object side surface of the first lens to the imaging plane of the optical imaging lens on the optical axis and half the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens ImgH satisfy the following: 1.38≤TTL / ImgH≤1.39.

Images