Optical imaging lens

Abstract

The application provides an optical imaging lens, a first lens has positive refractive power, and an object side surface of the first lens is a convex surface; a second lens has negative refractive power, and an image side surface of the second lens is a concave surface; a third lens has refractive power; a fourth lens has positive refractive power; a fifth lens has negative refractive power, an object side surface of the fifth lens is a convex surface, and an image side surface of the fifth lens is a concave surface; in the first lens to the third lens, at least one lens has a diffractive optical element on one surface, and the diffractive optical element has a diffraction efficiency greater than 80% for light in a wavelength range of 470nm-650nm; an on-axis distance TTL from the object side surface of the first lens to an imaging surface of the optical imaging lens and an air gap T34 of the third lens and the fourth lens on the optical axis satisfy: 3.5<TTL / T34<4.5. The application solves the problem of poor imaging quality of the optical imaging lens in the prior art.

Description

[0001] This application is a divisional application of the invention patent filed on October 18, 2021, with application number 2021112108869 and invention title "Optical Imaging Lens". Technical Field

[0002] This invention relates to the field of optical imaging equipment technology, and more specifically, to an optical imaging lens. Background Technology

[0003] In recent years, with the rapid development of smartphones and other electronic terminal devices, consumers have increasingly demanded miniaturization, ultra-thinness, and high image quality in their camera devices. Chromatic aberration, an important aberration affecting image quality, is usually caused by the different refractive indices of optical materials for different colors of light. Excessive chromatic aberration can easily affect the image quality of optical imaging lenses, resulting in poor image quality.

[0004] In other words, existing optical imaging lenses suffer from poor image quality. Summary of the Invention

[0005] The main objective of this invention is to provide an optical imaging lens to solve the problem of poor imaging quality in existing optical imaging lenses.

[0006] To achieve the above objectives, according to one aspect of the present invention, an optical imaging lens is provided, comprising: a first lens having positive optical power and a convex object-side surface; a second lens having negative optical power and a concave image-side surface; a third lens having optical power and a convex object-side surface; a fourth lens having positive optical power and a convex image-side surface; and a fifth lens having negative optical power, a convex object-side surface, and a concave image-side surface; wherein at least one of the first to third lenses has a diffractive optical element on one surface, the diffractive optical element having a diffraction efficiency greater than 80% for light in the wavelength range of 470nm-650nm; and the axial distance TTL from the object-side surface of the first lens to the imaging plane of the optical imaging lens satisfies the condition that TTL / f < 0.95 with respect to the effective focal length f of the optical imaging lens.

[0007] Furthermore, the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy the following relationship: 1.8 <f / f1<2.6。

[0008] Furthermore, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy the following relationship: 0.8 <f2 / f5<1.3。

[0009] Furthermore, the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R1 of the object-side surface of the first lens satisfy the following relationship: 1.2 <R4 / R1<2.6。

[0010] Furthermore, the effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy the following relationship: 0.8 <f4 / f<1.4。

[0011] Furthermore, the radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R5 of the object-side surface of the third lens satisfy the following relationship: 0.6 <R6 / R5<1.3。

[0012] Furthermore, the radius of curvature R10 of the image side of the fifth lens and the radius of curvature R9 of the object side of the fifth lens satisfy the following condition: 2.0 < (R9 + R10) / (R9 - R10) < 2.7.

[0013] Furthermore, the combined focal length f45 of the fourth and fifth lenses, and the combined focal length f23 of the second and third lenses, satisfy the following relationship: 1.6 <f45 / f23<2.7。

[0014] Furthermore, the combined focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens satisfy the following condition: 6.2 <f12 / (CT1+CT2)<10。

[0015] Furthermore, the axial distance TTL between the object-side surface of the first lens and the imaging plane of the optical imaging lens, and the air gap T34 between the third and fourth lenses on the optical axis of the optical imaging lens, satisfy the following condition: 3.5 <TTL / T34<4.5。

[0016] Furthermore, the edge thicknesses ET1 of the first lens, ET2 of the second lens, and ET3 of the third lens satisfy the following relationship: 0.8 <ET1 / (ET2+ET3)<1.4。

[0017] Furthermore, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the center thickness CT4 of the fourth lens, and the center thickness CT5 of the fifth lens satisfy the following condition: 1.0 < (ET4 + ET5) / (CT4 + CT5) < 1.5.

[0018] Furthermore, the surface of the diffractive optical element has a diffraction surface, which has multiple tooth structures, and these multiple tooth structures form multiple concentric circles around the optical axis of the optical imaging lens.

[0019] According to another aspect of the present invention, an optical imaging lens is provided, comprising: a first lens having positive optical power and a convex object-side surface; a second lens having negative optical power and a concave image-side surface; a third lens having optical power and a convex object-side surface; a fourth lens having positive optical power and a convex image-side surface; and a fifth lens having negative optical power, a convex object-side surface, and a concave image-side surface; wherein at least one of the first to third lenses has a diffractive optical element on one surface, the diffraction efficiency of the diffraction optical element for light in the wavelength range of 470nm-650nm is greater than 80%; and the axial distance TTL between the object-side surface of the first lens and the imaging plane of the optical imaging lens, and the air gap T34 between the third and fourth lenses on the optical axis of the optical imaging lens, satisfy 3.5. <TTL / T34<4.5。

[0020] Furthermore, the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy the following relationship: 1.8 <f / f1<2.6。

[0021] Furthermore, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy the following relationship: 0.8 <f2 / f5<1.3。

[0022] Furthermore, the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R1 of the object-side surface of the first lens satisfy the following relationship: 1.2 <R4 / R1<2.6。

[0023] Furthermore, the effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy the following relationship: 0.8 <f4 / f<1.4。

[0024] Furthermore, the radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R5 of the object-side surface of the third lens satisfy the following relationship: 0.6 <R6 / R5<1.3。

[0025] Furthermore, the radius of curvature R10 of the image side of the fifth lens and the radius of curvature R9 of the object side of the fifth lens satisfy the following condition: 2.0 < (R9 + R10) / (R9 - R10) < 2.7.

[0026] Furthermore, the combined focal length f45 of the fourth and fifth lenses, and the combined focal length f23 of the second and third lenses, satisfy the following relationship: 1.6 <f45 / f23<2.7。

[0027] Furthermore, the combined focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens satisfy the following condition: 6.2 <f12 / (CT1+CT2)<10。

[0028] Furthermore, 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 satisfy: 0.8 < ET1 / (ET2 + ET3) < 1.4.

[0029] Furthermore, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the central thickness CT4 of the fourth lens, and the central thickness CT5 of the fifth lens satisfy: 1.0 < (ET4 + ET5) / (CT4 + CT5) < 1.5.

[0030] Furthermore, the surface of the diffractive optical element has a diffractive surface, and the diffractive surface has a plurality of tooth structures. The plurality of tooth structures form a plurality of concentric circles around the optical axis of the optical imaging lens.

[0031] Applying the technical solution of the present invention, the optical imaging lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens has a positive optical power, and the object side surface of the first lens is a convex surface; the second lens has a negative optical power, and the image side surface of the second lens is a concave surface; the third lens has an optical power, and the object side surface of the third lens is a convex surface; the fourth lens has a positive optical power, and the image side surface of the fourth lens is a convex surface; the fifth lens has a negative optical power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; among the first lens to the third lens, at least one lens has a diffractive optical element on one surface, and the diffraction efficiency of the diffractive optical element for light in the wavelength range of 470 nm - 650 nm is greater than 80%; the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens, and the air gap T34 between the third lens and the fourth lens on the optical axis of the optical imaging lens satisfy: 3.5 < TTL / T34 < 4.5. By reasonably designing the optical power and surface shape of each lens, it is beneficial for the aberrations generated by each lens to cancel each other out, so that the optical imaging lens can achieve the function of ultra-clear photographing. The diffractive optical element has the ability of anomalous dispersion, which can balance the normal dispersion generated by the lens and improve the imaging quality of the optical imaging lens. By restricting TTL / T34 within a reasonable range, it is beneficial for the overall spatial structure layout of the optical imaging lens, increases the design freedom of the optical imaging lens, and is also beneficial for the miniaturization of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

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

[0034] Figures 2 to 3 They are shown respectively Figure 1 The on-axis chromatic aberration curve and ordinary diffraction modulation transfer function of the optical imaging lens in the image;

[0035] Figure 4 A schematic diagram of the structure of an optical imaging lens according to Example 2 of the present invention is shown;

[0036] Figures 5 to 6 They are shown respectively Figure 4 The on-axis chromatic aberration curve and ordinary diffraction modulation transfer function of the optical imaging lens in the image;

[0037] Figure 7 A schematic diagram of the structure of an optical imaging lens according to Example 3 of the present invention is shown;

[0038] Figures 8 to 9 They are shown respectively Figure 7 The on-axis chromatic aberration curve and ordinary diffraction modulation transfer function of the optical imaging lens in the image;

[0039] Figure 10 A schematic diagram of the structure of an optical imaging lens according to Example 4 of the present invention is shown;

[0040] Figures 11 to 12 They are shown respectively Figure 10 The on-axis chromatic aberration curve and ordinary diffraction modulation transfer function of the optical imaging lens in the image;

[0041] Figure 13 A schematic diagram of the structure of an optical imaging lens according to Example 5 of the present invention is shown;

[0042] Figures 14 to 15 They are shown respectively Figure 13 The on-axis chromatic aberration curve and ordinary diffraction modulation transfer function of the optical imaging lens in the image;

[0043] Figure 16 A schematic diagram of the structure of an optical imaging lens according to Example Six of the present invention is shown;

[0044] Figures 17 to 18 They are shown respectively Figure 16 The on-axis chromatic aberration curve and ordinary diffraction modulation transfer function of the optical imaging lens in the image;

[0045] Figure 19 A schematic diagram showing the relationship between the diffractive optical elements of an optical imaging lens and the design wavelength is shown.

[0046] The above figures include the following reference numerals:

[0047] STO, Aperture Stop; E1, First Lens; S1, Object-side Face of First Lens; S2, Image-side Face of First Lens; E2, Second Lens; S3, Object-side Face of Second Lens; S4, Image-side Face of Second Lens; E3, Third Lens; S5, Object-side Face of Third Lens; S6, Image-side Face of Third Lens; E4, Fourth Lens; S7, Object-side Face of Fourth Lens; S8, Image-side Face of Fourth Lens; E5, Fifth Lens; S9, Object-side Face of Fifth Lens; S10, Image-side Face of Fifth Lens; E6, Filter; S11, Object-side Face of Filter; S12, Image-side Face of Filter; S13, Imaging Surface. Detailed Implementation

[0048] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0049] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0050] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0051] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0052] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0053] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 side is called the object-side surface of the lens, and the surface of each lens closest to the image side is called the image-side surface of the lens. The surface shape in the paraxial region can be determined according to the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. For the object-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0054] To address the problem of poor image quality in existing optical imaging lenses, this invention provides an optical imaging lens.

[0055] With the widespread adoption and rapid development of smartphones, consumers are increasingly demanding smaller, thinner phones with higher image quality. Chromatic aberration, a significant aberration affecting image quality, is typically caused by the different refractive indices of optical materials for different colors of light and can be corrected by selecting appropriate combinations of positive and negative lenses. Diffractive optical elements possess strong anomalous dispersion characteristics; combining them with traditional refractive optical imaging lenses can effectively counteract the normal dispersion of the refractive optical imaging lens, thereby increasing design flexibility, reducing chromatic aberration, and improving image quality. This application proposes a long-focal-length refractive optical imaging lens with high image quality and high diffraction efficiency by rationally allocating the optical power of refractive and diffractive optical elements and optimizing optical parameters.

[0056] Example 1

[0057] like Figures 1 to 19 As shown, the optical imaging lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens has positive optical power and its object-side surface is convex. The second lens has negative optical power and its image-side surface is concave. The third lens has optical power and its object-side surface is convex. The fourth lens has positive optical power and its image-side surface is convex. The fifth lens has negative optical power, its object-side surface is convex, and its image-side surface is concave. At least one of the first to third lenses has a diffractive optical element on one surface, and the diffraction efficiency of the diffractive optical element for light in the wavelength range of 470nm-650nm is greater than 80%. The axial distance TTL from the object-side surface of the first lens to the imaging plane of the optical imaging lens satisfies the condition that TTL / f < 0.95 with respect to the effective focal length f of the optical imaging lens.

[0058] By reasonably designing the optical power and surface shape of each lens, it is beneficial for the aberrations generated by each lens to cancel each other out, so that the optical imaging lens can achieve the function of ultra-clear photography. The diffractive optical element has the ability of anomalous dispersion, which can balance the normal dispersion generated by the lens and improve the imaging quality of the optical imaging lens. By limiting the TTL / f within a reasonable range, while ensuring the long focal length characteristics of the optical imaging lens, reducing the total length of the optical imaging lens is beneficial to realizing the ultra-thinness of the optical imaging lens.

[0059] Preferably, the axial distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens and the effective focal length f of the optical imaging lens satisfy: 0.8 < TTL / f < 0.9.

[0060] As Figure 19 shown, the relationship between the diffractive optical element and the design wavelength is shown.

[0061] In this embodiment, the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: 1.8 < f / f1 < 2.6. By limiting f / f1 within a reasonable range, it is beneficial for the light rays on the object side surface to converge on the first lens, reducing the aperture of the first lens, which is beneficial for the optical imaging lens to achieve ultra-thinness. Preferably, 1.9 < f / f1 < 2.5.

[0062] In this embodiment, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: 0.8 < f2 / f5 < 1.3. By limiting f2 / f5 within a reasonable range, it is beneficial for reasonably adjusting the aberration contribution amounts of the second lens and the fifth lens to the optical imaging lens. Preferably, 0.9 < f2 / f5 < 1.2.

[0063] In this embodiment, the radius of curvature R4 of the image side surface of the second lens and the radius of curvature R1 of the object side surface of the first lens satisfy: 1.2 < R4 / R1 < 2.6. Reasonably controlling the radius of curvature of the image side surface of the second lens and the object side surface of the first lens is beneficial for reducing aberrations. Preferably, 1.3 < R4 / R1 < 2.5.

[0064] In this embodiment, the effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy: 0.8 < f4 / f < 1.4. Reasonably configuring the ratio of the effective focal length of the fourth lens to the effective focal length of the optical imaging lens is beneficial for the reasonable configuration of the optical power and reducing aberrations. Preferably, 0.9 < f4 / f < 1.3.

[0065] In this embodiment, the following condition is satisfied between the radius of curvature R6 of the image side surface of the third lens and the radius of curvature R5 of the object side surface of the third lens: 0.6 < R6 / R5 < 1.3. By controlling R6 / R5 within a reasonable range, it is beneficial to reasonably adjust the contribution of the third lens to the aberration of the optical imaging lens. Preferably, 0.7 < R6 / R5 < 1.2.

[0066] In this embodiment, the following condition is satisfied between the radius of curvature R10 of the image side surface of the fifth lens and the radius of curvature R9 of the object side surface of the fifth lens: 2.0 < (R9 + R10) / (R9 - R10) < 2.7. By restricting (R9 + R10) / (R9 - R10) within a reasonable range, it is beneficial to reduce aberration. Preferably, 2.1 < (R9 + R10) / (R9 - R10) < 2.6.

[0067] In this embodiment, the following condition is satisfied between the combined focal length f45 of the fourth lens and the fifth lens and the combined focal length f23 of the second lens and the third lens: 1.6 < f45 / f23 < 2.7. By restricting f45 / f23 within a reasonable range, it is beneficial to reduce the aberration of the optical imaging lens. Preferably, 1.7 < f45 / f23 < 2.6.

[0068] In this embodiment, the following condition is satisfied among the combined focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens, and the central thickness CT2 of the second lens: 6.2 < f12 / (CT1 + CT2) < 10. By restricting f12 / (CT1 + CT2) within a reasonable range, it is beneficial to achieve the ultra-thinning of the optical imaging lens. Preferably, 6.3 < f12 / (CT1 + CT2) < 9.9.

[0069] In this embodiment, the following condition is satisfied between the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens and the air gap T34 between the third lens and the fourth lens on the optical axis of the optical imaging lens: 3.5 < TTL / T34 < 4.5. By restricting TTL / T34 within a reasonable range, it is beneficial to the overall spatial structure layout of the optical imaging lens, increases the design freedom of the optical imaging lens, and is also beneficial to the miniaturization of the optical imaging lens. Preferably, 3.6 < TTL / T34 < 4.3.

[0070] In this embodiment, the following condition is satisfied among 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: 0.8 < ET1 / (ET2 + ET3) < 1.4. By controlling the edge thicknesses of the first lens, the second lens, and the third lens, it is beneficial to ensure the processability of the optical imaging lens and make the spatial distribution of the optical imaging lens more reasonable. Preferably, 0.9 < ET1 / (ET2 + ET3) < 1.3.

[0071] In this embodiment, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the center thickness CT4 of the fourth lens, and the center thickness CT5 of the fifth lens satisfy the following condition: 1.0 < (ET4 + ET5) / (CT4 + CT5) < 1.5. By limiting (ET4 + ET5) / (CT4 + CT5) within a reasonable range, the edge and center thicknesses of the fourth and fifth lenses can be reasonably constrained, ensuring the manufacturability of the optical imaging lens while reducing aberrations. Preferably, 1.05 < (ET4 + ET5) / (CT4 + CT5) < 1.3.

[0072] In this embodiment, the surface of the diffractive optical element has a diffraction surface with multiple tooth structures arranged in concentric circles around the optical axis. Light diffracts on the diffraction surface. Because the diffractive optical element exhibits anomalous dispersion, it can counteract the normal dispersion of the refractive element, thereby reducing chromatic aberration in the optical imaging lens and improving image quality. Furthermore, the tooth structure enhances the diffraction characteristics of the diffractive optical element, which in turn helps reduce chromatic aberration in the optical imaging lens.

[0073] Example 2

[0074] like Figures 1 to 19 As shown, the optical imaging lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens has positive optical power and its object-side surface is convex. The second lens has negative optical power and its image-side surface is concave. The third lens has optical power and its object-side surface is convex. The fourth lens has positive optical power and its image-side surface is convex. The fifth lens has negative optical power, its object-side surface is convex, and its image-side surface is concave. At least one of the first to third lenses has a diffractive optical element on one surface, and the diffraction efficiency of the diffraction optical element for light in the wavelength range of 470nm-650nm is greater than 80%. The axial distance TTL between the object-side surface of the first lens and the imaging plane of the optical imaging lens, and the air gap T34 between the third and fourth lenses on the optical axis of the optical imaging lens, satisfy the following condition: 3.5 <TTL / T34<4.5。

[0075] By rationally designing the optical power and surface shape of each lens, aberrations produced by each lens can be mutually canceled, thus enabling the optical imaging lens to achieve ultra-high-definition imaging capabilities. Diffractive optical elements possess anomalous dispersion capabilities, which can balance the normal dispersion produced by the lenses, improving the image quality of the optical imaging lens. Limiting TTL / T34 within a reasonable range facilitates the overall spatial structure layout of the optical imaging lens, increasing the design freedom and promoting miniaturization.

[0076] Preferably, the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens and the air gap T34 between the third lens and the fourth lens on the optical axis of the optical imaging lens satisfy: 3.6 < TTL / T34 < 4.3.

[0077] In this embodiment, the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: 1.8 < f / f1 < 2.6. By restricting f / f1 within a reasonable range, it is beneficial for the light rays on the object side surface to converge on the first lens, reducing the aperture of the first lens, which is conducive to making the optical imaging lens ultra-thin. Preferably, 1.9 < f / f1 < 2.5.

[0078] In this embodiment, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: 0.8 < f2 / f5 < 1.3. By restricting f2 / f5 within a reasonable range, it is beneficial for reasonably adjusting the aberration contribution of the second lens and the fifth lens to the optical imaging lens. Preferably, 0.9 < f2 / f5 < 1.2.

[0079] In this embodiment, the radius of curvature R4 of the image side surface of the second lens and the radius of curvature R1 of the object side surface of the first lens satisfy: 1.2 < R4 / R1 < 2.6. Reasonably controlling the radius of curvature of the image side surface of the second lens and the object side surface of the first lens is beneficial for reducing aberration. Preferably, 1.3 < R4 / R1 < 2.5.

[0080] In this embodiment, the effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy: 0.8 < f4 / f < 1.4. Reasonably configuring the ratio of the effective focal length of the fourth lens to the effective focal length of the optical imaging lens is beneficial for reasonably configuring the optical power and reducing aberration. Preferably, 0.9 < f4 / f < 1.3.

[0081] In this embodiment, the radius of curvature R6 of the image side surface of the third lens and the radius of curvature R5 of the object side surface of the third lens satisfy: 0.6 < R6 / R5 < 1.3. By controlling R6 / R5 within a reasonable range, it is beneficial for reasonably adjusting the aberration contribution of the third lens to the optical imaging lens. Preferably, 0.7 < R6 / R5 < 1.2.

[0082] In this embodiment, the radius of curvature R10 of the image side surface of the fifth lens and the radius of curvature R9 of the object side surface of the fifth lens satisfy: 2.0 < (R9 + R10) / (R9 - R10) < 2.7. By restricting (R9 + R10) / (R9 - R10) within a reasonable range, it is beneficial for reducing aberration. Preferably, 2.1 < (R9 + R10) / (R9 - R10) < 2.6.

[0083] In this embodiment, the combined focal length f45 of the fourth lens and the fifth lens and the combined focal length f23 of the second lens and the third lens satisfy: 1.6 < f45 / f23 < 2.7. By restricting f45 / f23 within a reasonable range, it is beneficial to reduce the aberration of the optical imaging lens. Preferably, 1.7 < f45 / f23 < 2.6.

[0084] In this embodiment, the combined focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens, and the central thickness CT2 of the second lens satisfy: 6.2 < f12 / (CT1 + CT2) < 10. By restricting f12 / (CT1 + CT2) within a reasonable range, it is beneficial to achieve the ultra-thinning of the optical imaging lens. Preferably, 6.3 < f12 / (CT1 + CT2) < 9.9.

[0085] In this 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 satisfy: 0.8 < ET1 / (ET2 + ET3) < 1.4. By controlling the edge thicknesses of the first lens, the second lens, and the third lens, it is beneficial to ensure the processability of the optical imaging lens and make the spatial distribution of the optical imaging lens more reasonable. Preferably, 0.9 < ET1 / (ET2 + ET3) < 1.3.

[0086] In this embodiment, the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the central thickness CT4 of the fourth lens, and the central thickness CT5 of the fifth lens satisfy: 1.0 < (ET4 + ET5) / (CT4 + CT5) < 1.5. By restricting (ET4 + ET5) / (CT4 + CT5) within a reasonable range, the edge thicknesses and central thicknesses of the fourth lens and the fifth lens can be reasonably constrained, reducing the aberration of the optical imaging lens while ensuring the processability of the optical imaging lens. Preferably, 1.05 < (ET4 + ET5) / (CT4 + CT5) < 1.3.

[0087] In this embodiment, the surface of the diffractive optical element has a diffractive surface, and the diffractive surface has multiple tooth structures. The multiple tooth structures enclose multiple concentric circles around the optical axis. Light diffracts on the diffractive surface. Since the diffractive optical element has anomalous dispersion, it can cancel the normal dispersion of the refractive element, thereby reducing the chromatic aberration of the optical imaging lens and improving the imaging quality. The setting of the tooth structures can increase the diffractive characteristics of the diffractive optical element, which is further beneficial to reducing the chromatic aberration of the optical imaging lens.

[0088] Optionally, the above 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.

[0089] The optical imaging lens in this application can employ multiple lenses, such as the five lenses mentioned above. By rationally allocating the optical power, surface shape, center thickness of each lens, and on-axis distance between lenses, the aperture of the optical imaging lens can be effectively increased, the lens sensitivity reduced, and the lens's manufacturability improved. This makes the optical imaging lens more suitable for manufacturing and processing, and applicable to portable electronic devices such as smartphones. The aforementioned optical imaging lens also possesses advantages such as large aperture, wide field of view, ultra-thin design, and excellent image quality, meeting the miniaturization requirements of smart electronic products.

[0090] In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0091] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although five lenses are described as an example in the embodiments, the optical imaging lens is not limited to including five lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0092] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical lens groups applicable to the above embodiments.

[0093] It should be noted that any of the examples one through six below are applicable to all embodiments of this application.

[0094] Example 1

[0095] like Figures 1 to 3 As shown, an optical imaging lens of Example 1 of this application is described. Figure 1 A schematic diagram of the optical imaging lens structure of Example 1 is shown.

[0096] like Figure 1 As shown, the optical imaging lens includes, from the object side to the image side, the following components in sequence: aperture STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, filter E6, and imaging surface S13.

[0097] The first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has positive optical power, its object-side surface S7 is concave, and its image-side surface S8 is convex. The fifth lens E5 has negative optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged on the imaging surface S13.

[0098] In this example, the diffractive optical element is disposed on the first lens and located on the image-side surface of the first lens. The total effective focal length f of the optical imaging lens is 14.40 mm, the total length TTL of the optical imaging lens is 12.75 mm, and the image height ImgH is 2.71 mm.

[0099] Table 1 shows the basic structural parameters of the optical imaging lens in Example 1, where the units for radius of curvature, thickness / distance, focal length, and effective radius are all millimeters (mm).

[0100]

[0101]

[0102] Table 1

[0103] In Example 1, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the fifth lens E5, are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0104]

[0105] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical mirrors S1-S10 in Example 1.

[0106] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.3640E-02 1.5888E-03 4.6158E-04 5.4740E-05 1.0136E-05 1.3679E-06 3.4967E-06 -3.4113E-07 -2.3865E-07 S2 6.0443E-02 4.0290E-03 7.1230E-04 -3.6636E-04 -8.6087E-06 4.5275E-05 -1.3191E-05 0.0000E+00 0.0000E+00 S3 1.3799E-01 -1.1569E-02 1.9184E-03 -1.2045E-03 -1.5929E-04 1.3435E-04 -7.4696E-05 2.9224E-05 -1.1087E-05 S4 1.5595E-01 -5.2287E-03 9.0797E-04 -7.6251E-04 -6.2944E-04 1.3491E-04 -8.3952E-05 5.1489E-05 -8.2052E-06 S5 -6.2896E-03 2.2270E-02 1.4393E-03 2.3323E-04 -7.1880E-04 -3.2243E-06 -8.7175E-05 2.9858E-05 -1.1139E-05 S6 -7.2896E-02 1.3206E-02 1.5418E-03 3.0881E-04 -3.0220E-04 -6.7451E-05 -4.1389E-05 3.8381E-06 -3.4801E-06 S7 -8.8132E-02 -7.1183E-03 -6.5136E-04 1.7411E-05 6.9048E-07 1.1211E-05 6.6843E-06 3.3286E-06 1.1766E-06 S8 -1.0584E-01 -2.9749E-03 -1.0231E-03 3.5618E-04 -6.0812E-05 3.4290E-05 3.4280E-06 4.5121E-06 -5.0479E-08 S9 -3.7130E-01 4.5139E-02 -8.1517E-03 1.9134E-03 -3.6816E-04 9.6635E-05 -2.8494E-06 6.0115E-06 6.5851E-07 S10 -4.4541E-01 4.8610E-02 -1.0295E-02 2.3101E-03 -5.5318E-04 1.4232E-04 -2.6407E-05 7.8379E-06 -1.7611E-06

[0107] Table 2

[0108] Figure 2 The on-axis chromatic aberration curve of an optical imaging lens in Example 1 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 3 The ordinary diffraction modulation transfer function of the optical imaging lens in Example 1 is shown, which represents the diffraction performance of the optical imaging lens.

[0109] according to Figure 2 and Figure 3 As can be seen, the optical imaging lens given in Example 1 can achieve good image quality.

[0110] Example 2

[0111] like Figures 4 to 6 The image shows an optical imaging lens of Example 2 of this application. For the sake of brevity, descriptions similar to those in Example 1 will be omitted in this example and the following examples. Figure 4 A schematic diagram of the optical imaging lens structure of Example 2 is shown.

[0112] like Figure 4 As shown, the optical imaging lens, from the object side to the image side, includes, in sequence: aperture STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging surface S15.

[0113] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S13.

[0114] In this example, the diffractive optical element is mounted on the third lens and located on the image-side surface of the third lens. The total effective focal length f of the optical imaging lens is 14.40 mm, the total length TTL of the optical imaging lens is 12.73 mm, and the image height ImgH is 2.71 mm.

[0115] Table 3 shows the basic structural parameters of the optical imaging lens in Example 2, where the units for radius of curvature, thickness / distance, focal length, and effective radius are all millimeters (mm).

[0116]

[0117] Table 3

[0118] Table 4 shows the higher-order coefficients that can be used for each aspherical mirror in Example 2, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0119]

[0120]

[0121] Table 4

[0122] Figure 5 The on-axis chromatic aberration curve of an optical imaging lens in Example 1 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 6 The ordinary diffraction modulation transfer function of the optical imaging lens in Example 1 is shown, which represents the diffraction performance of the optical imaging lens.

[0123] according to Figure 5 and Figure 6 As can be seen, the optical imaging lens given in Example 1 can achieve good image quality.

[0124] Example 3

[0125] like Figures 7 to 9 As shown, an optical imaging lens of Example 3 of this application is described. Figure 7 A schematic diagram of the optical imaging lens structure of Example 3 is shown.

[0126] like Figure 7 As shown, the optical imaging lens, from the object side to the image side, includes, in sequence: aperture STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging surface S15.

[0127] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S13.

[0128] In this example, the diffractive optical element is disposed on the first lens and located on the image-side surface of the first lens. The total effective focal length f of the optical imaging lens is 14.41 mm, the total length TTL of the optical imaging lens is 12.71 mm, and the image height ImgH is 2.71 mm.

[0129] Table 5 shows the basic structural parameters of the optical imaging lens in Example 3, where the units for radius of curvature, thickness / distance, focal length, and effective radius are all millimeters (mm).

[0130]

[0131]

[0132] Table 5

[0133] Table 6 shows the higher-order coefficients that can be used for each aspherical mirror in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0134] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.4555E-02 2.1633E-03 7.5392E-04 1.1027E-04 3.8312E-05 1.0122E-05 1.2827E-06 -4.1834E-07 -3.8259E-07 S2 5.9655E-02 4.1810E-03 1.3460E-03 -2.4813E-04 4.6991E-05 7.0898E-05 -4.1351E-05 0.0000E+00 0.0000E+00 S3 1.3956E-01 -1.1787E-02 2.0239E-03 -9.0128E-04 -3.3177E-04 1.9219E-04 -7.6829E-05 6.2756E-06 -5.8837E-08 S4 1.5405E-01 -4.6209E-03 1.1812E-03 -7.3108E-04 -8.7095E-04 1.4974E-04 -1.0492E-05 1.3617E-05 1.7597E-06 S5 -3.6576E-03 2.1802E-02 1.3146E-03 -2.4558E-04 -8.3971E-04 9.7676E-05 6.8600E-06 1.5385E-06 -4.3345E-06 S6 -7.6153E-02 1.3232E-02 9.6779E-04 5.6078E-05 -3.3630E-04 1.9795E-05 2.6960E-06 3.8191E-07 -1.4626E-06 S7 -8.5796E-02 -6.8535E-03 -6.9065E-04 -2.1813E-05 1.1189E-05 3.0104E-05 1.8028E-05 6.4483E-06 2.3166E-06 S8 -1.0533E-01 -2.6317E-03 -1.3611E-03 2.8626E-04 -3.1003E-05 6.0621E-05 1.6109E-05 5.8489E-06 1.5165E-06 S9 -3.7604E-01 4.1149E-02 -7.2438E-03 1.4372E-03 -2.0264E-04 9.7038E-05 1.7564E-05 5.0080E-06 3.1460E-06 S10 -4.4955E-01 4.5358E-02 -9.1247E-03 1.8556E-03 -3.8888E-04 1.1232E-04 -1.0445E-05 4.7677E-06 1.4454E-06

[0135] Table 6

[0136] Figure 8 The on-axis chromatic aberration curve of the optical imaging lens in Example 3 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 9 The ordinary diffraction modulation transfer function of the optical imaging lens in Example 3 is shown, which represents the diffraction performance of the optical imaging lens.

[0137] according to Figure 8 and Figure 9 As can be seen, the optical imaging lens given in Example 3 can achieve good imaging quality.

[0138] Example 4

[0139] like Figures 10 to 12 As shown, an optical imaging lens of Example 4 of this application is described. Figure 10 A schematic diagram of the optical imaging lens structure of Example 4 is shown.

[0140] like Figure 10 As shown, the optical imaging lens, from the object side to the image side, includes, in sequence: aperture STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging surface S15.

[0141] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S13.

[0142] In this example, the diffractive optical element is disposed on the first lens and located on the image-side surface of the first lens. The total effective focal length f of the optical imaging lens is 14.40 mm, the total length TTL of the optical imaging lens is 12.73 mm, and the image height ImgH is 2.71 mm.

[0143] Table 7 shows the basic structural parameters of the optical imaging lens in Example 4, where the units for radius of curvature, thickness / distance, focal length, and effective radius are all millimeters (mm).

[0144]

[0145] Table 7

[0146] Table 8 shows the higher-order coefficients that can be used for each aspherical mirror in Example 4, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0147] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.4997E-02 1.8988E-03 5.0120E-04 5.1769E-05 1.3028E-05 2.1475E-06 1.2819E-06 -2.2414E-07 -1.2554E-07 S2 6.0176E-02 3.9853E-03 8.3987E-04 -2.6688E-04 2.3789E-05 4.1017E-05 -1.7964E-05 0.0000E+00 0.0000E+00 S3 1.3634E-01 -1.2075E-02 1.7908E-03 -1.1516E-03 -1.7535E-04 1.5377E-04 -6.3631E-05 1.1397E-05 -3.5193E-06 S4 1.5696E-01 -4.8430E-03 9.8974E-04 -7.7538E-04 -6.8622E-04 1.4096E-04 -2.6513E-05 1.7683E-05 -2.3556E-06 S5 -5.6037E-03 2.2258E-02 1.3449E-03 5.8996E-05 -6.7412E-04 3.2976E-05 -1.4939E-05 4.6819E-06 -5.6389E-06 S6 -7.3832E-02 1.3027E-02 1.4241E-03 1.8596E-04 -2.6107E-04 -3.9819E-05 -1.1290E-05 -3.0414E-06 -2.0951E-06 S7 -8.6371E-02 -7.6417E-03 -8.6087E-04 -5.3645E-06 -9.7716E-06 1.2758E-05 1.0560E-05 5.8820E-06 2.5728E-06 S8 -1.0739E-01 -3.2140E-03 -1.5306E-03 3.7317E-04 -7.3966E-05 4.0349E-05 9.2117E-06 7.7380E-06 1.6718E-06 S9 -3.7463E-01 4.2505E-02 -7.4756E-03 1.6575E-03 -2.7448E-04 8.3871E-05 1.3785E-05 9.8124E-06 4.6638E-06 S10 -4.4573E-01 4.6328E-02 -9.4225E-03 2.0246E-03 -4.5465E-04 1.1636E-04 -1.2629E-05 8.5827E-06 1.8678E-06

[0148] Table 8

[0149] Figure 11 The on-axis chromatic aberration curve of the optical imaging lens in Example 4 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 12 The ordinary diffraction modulation transfer function of the optical imaging lens in Example 4 is shown, which represents the diffraction performance of the optical imaging lens.

[0150] according to Figure 11 and Figure 12 As can be seen, the optical imaging lens given in Example 4 can achieve good imaging quality.

[0151] Example 5

[0152] like Figures 13 to 15 As shown, an optical imaging lens of Example 5 of this application is described. Figure 13 A schematic diagram of the optical imaging lens structure of Example 5 is shown.

[0153] like Figure 13 As shown, the optical imaging lens, from the object side to the image side, includes, in sequence: aperture STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging surface S15.

[0154] The first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is concave, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has positive optical power, its object-side surface S7 is concave, and its image-side surface S8 is convex. The fifth lens E5 has negative optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S13.

[0155] In this example, the diffractive optical element is disposed on the first lens and located on the image-side surface of the first lens. The total effective focal length f of the optical imaging lens is 14.40 mm, the total length TTL of the optical imaging lens is 12.72 mm, and the image height ImgH is 2.71 mm.

[0156] Table 9 shows the basic structural parameters of the optical imaging lens in Example 5, where the units for radius of curvature, thickness / distance, focal length, and effective radius are all millimeters (mm).

[0157]

[0158]

[0159] Table 9

[0160] Table 10 shows the higher-order coefficients that can be used for each aspherical mirror in Example 5, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0161] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.2078E-02 2.2262E-03 6.0642E-04 1.0697E-04 4.3660E-05 1.1012E-05 9.9419E-07 -5.0121E-07 -3.2085E-07 S2 5.8473E-02 4.8141E-03 1.0781E-03 -2.7139E-04 3.6080E-05 8.0257E-05 -5.3134E-05 0.0000E+00 0.0000E+00 S3 1.3896E-01 -1.2046E-02 1.9929E-03 -9.7078E-04 -2.5114E-04 1.6796E-04 -6.2201E-05 4.0759E-06 -4.4415E-08 S4 1.5557E-01 -4.6612E-03 9.4287E-04 -7.7798E-04 -6.8049E-04 1.0970E-04 6.1719E-06 8.3071E-06 1.5301E-06 S5 -6.7023E-03 2.1463E-02 1.2371E-03 -2.9270E-04 -7.2311E-04 2.6188E-05 1.5468E-05 -4.0872E-06 -1.8009E-06 S6 -7.2200E-02 1.3094E-02 1.1874E-03 -8.2591E-05 -3.5864E-04 -2.8120E-05 5.0844E-06 -2.5706E-06 4.5043E-07 S7 -8.6285E-02 -7.3979E-03 -8.0982E-04 -1.3709E-05 3.0403E-06 2.3559E-05 1.5919E-05 6.7872E-06 2.6054E-06 S8 -1.0627E-01 -2.6660E-03 -1.5115E-03 3.5471E-04 -5.3054E-05 5.6102E-05 1.4619E-05 7.2656E-06 1.6760E-06 S9 -3.7199E-01 4.2458E-02 -7.5086E-03 1.6005E-03 -2.4789E-04 1.0194E-04 1.8251E-05 8.0340E-06 3.9568E-06 S10 -4.4563E-01 4.5366E-02 -9.3772E-03 1.9582E-03 -4.2670E-04 1.2276E-04 -9.7032E-06 7.4336E-06 1.9152E-06

[0162] Table 10

[0163] Figure 14 The on-axis chromatic aberration curve of the optical imaging lens in Example 5 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 15The ordinary diffraction modulation transfer function of the optical imaging lens in Example 5 is shown, which represents the diffraction performance of the optical imaging lens.

[0164] according to Figure 14 and Figure 15 As can be seen, the optical imaging lens given in Example 5 can achieve good imaging quality.

[0165] Example 6

[0166] like Figures 16 to 18 As shown, an optical imaging lens of Example Six of this application is described. Figure 16 A schematic diagram of the optical imaging lens structure of Example Six is ​​shown.

[0167] like Figure 16 As shown, the optical imaging lens, from the object side to the image side, includes, in sequence: aperture STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, filter E7, and imaging surface S15.

[0168] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The filter E6 has an object-side surface S11 and an image-side surface S12. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S13.

[0169] In this example, the diffractive optical element is mounted on the third lens and located on the image-side surface of the third lens. The total effective focal length f of the optical imaging lens is 14.40 mm, the total length TTL of the optical imaging lens is 12.73 mm, and the image height ImgH is 2.71 mm.

[0170] Table 11 shows the basic structural parameters of the optical imaging lens of Example 6, where the units for radius of curvature, thickness / distance, focal length, and effective radius are all millimeters (mm).

[0171]

[0172] Table 11

[0173] Table 12 shows the higher-order coefficients that can be used for each aspherical mirror in Example 6, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0174] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.4656E-02 1.4083E-03 4.9932E-04 9.0992E-05 1.5101E-05 1.5835E-06 6.1156E-06 -5.8383E-07 -7.0903E-07 S2 6.0612E-02 5.7296E-03 6.5107E-04 -9.1492E-05 -1.0569E-04 1.3946E-04 -5.9890E-05 0.0000E+00 0.0000E+00 S3 1.3900E-01 -1.1015E-02 2.3254E-03 -7.6614E-04 -1.7692E-04 1.8930E-04 -1.1847E-04 2.1732E-05 -2.9526E-06 S4 1.5505E-01 -5.0653E-03 1.6579E-03 -5.4474E-04 -4.6509E-04 9.2283E-05 -1.1947E-04 3.0946E-05 -7.5367E-07 S5 -7.0935E-03 2.1562E-02 1.7169E-03 2.8922E-04 -4.1732E-04 3.7415E-06 -8.4703E-05 1.3208E-05 -5.0122E-06 S6 -7.1887E-02 1.2661E-02 1.6427E-03 3.5446E-04 -1.1395E-04 -6.0236E-05 -3.1899E-05 -1.2119E-05 -3.6144E-06 S7 -8.1974E-02 -7.0082E-03 -5.7831E-04 2.3778E-05 -2.5063E-05 2.6530E-07 4.8063E-06 5.2274E-06 1.9577E-06 S8 -1.0935E-01 -3.3776E-03 -9.4160E-04 2.9146E-04 -8.9446E-05 1.8946E-05 5.8008E-06 8.1015E-06 9.2974E-07 S9 -3.7348E-01 4.0433E-02 -6.2646E-03 1.3297E-03 -2.4751E-04 6.4332E-05 1.8459E-05 1.4354E-05 3.9882E-06 S10 -4.4254E-01 4.4259E-02 -8.6619E-03 1.7157E-03 -3.8945E-04 1.0143E-04 -2.4345E-06 1.1341E-05 1.7199E-06

[0175] Table 12

[0176] Figure 17 The on-axis chromatic aberration curve of the optical imaging lens in Example Six is ​​shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 18 The ordinary diffraction modulation transfer function of the optical imaging lens in Example Six is ​​shown, which represents the diffraction performance of the optical imaging lens.

[0177] according to Figure 17 and Figure 18 As can be seen, the optical imaging lens given in Example 6 can achieve good imaging quality.

[0178] In summary, Examples 1 to 6 respectively satisfy the relationships shown in Table 13.

[0179]

[0180]

[0181] Table 13

[0182] Table 14 shows the effective focal length f of the optical imaging lenses in Examples 1 to 6, and the effective focal lengths f1 to f5 of each lens.

[0183] Example parameters 1 2 3 4 5 6 f1(mm) 6.98 6.77 6.14 6.84 6.90 6.95 f2 (mm) -9.68 -9.34 -11.01 -9.70 -10.17 -9.97 f3 (mm) 38.32 40.90 -89.43 45.10 50.13 47.38 f4 (mm) 16.22 15.70 17.53 16.43 17.42 16.92 f5 (mm) -9.25 -9.11 -9.80 -9.33 -9.63 -9.54 f(mm) 14.40 14.40 14.41 14.40 14.40 14.40 TTL(mm) 12.75 12.73 12.71 12.73 12.72 12.73 ImgH(mm) 2.71 2.71 2.71 2.71 2.71 2.71

[0184] Table 14

[0185] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone 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.

[0186] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0187] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0188] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0189] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical imaging lens, characterized in that, The optical imaging lens has five lenses with optical power, including: A first lens, having positive optical power, wherein the object side of the first lens is convex; The second lens has negative optical power and its image-side surface is concave. The third lens has optical power, the object side of the third lens is convex, and the image side of the third lens is concave. The fourth lens has positive optical power and its image-side surface is convex. The fifth lens has negative optical power, the object side of the fifth lens is convex, and the image side of the fifth lens is concave. In the first to third lenses, at least one lens has a diffractive optical element on one surface, and the diffractive optical element has a diffraction efficiency greater than 80% for light in the wavelength range of 470nm-650nm; The axial distance TTL from the object side of the first lens to the imaging plane of the optical imaging lens, and the air gap T34 between the third lens and the fourth lens on the optical axis of the optical imaging lens satisfy the following: 3.72≤TTL / T34≤4.17; The radius of curvature R6 of the image side of the third lens and the radius of curvature R5 of the object side of the third lens satisfy the following condition: 0.89≤R6 / R5≤1.

14.

2. The optical imaging lens according to claim 1, characterized in that, The effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy the following condition: 2.06 ≤ f / f1 ≤ 2.

35.

3. The optical imaging lens according to claim 1, characterized in that, The effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy the following condition: 1.03 ≤ f2 / f5 ≤ 1.

12.

4. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R4 of the image side of the second lens and the radius of curvature R1 of the object side of the first lens satisfy the following condition: 1.42≤R4 / R1≤2.

42.

5. The optical imaging lens according to claim 1, characterized in that, The effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy the following condition: 1.09 ≤ f4 / f ≤ 1.

22.

6. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R10 of the image side of the fifth lens and the radius of curvature R9 of the object side of the fifth lens satisfy the following condition: 2.22≤(R9+R10) / (R9-R10)≤2.

48.

7. The optical imaging lens according to claim 1, characterized in that, The combined focal length f45 of the fourth lens and the fifth lens, and the combined focal length f23 of the second lens and the third lens satisfy the following condition: 1.89 ≤ f45 / f23 ≤ 2.

53.

8. The optical imaging lens according to claim 1, characterized in that, The combined focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens satisfy the following condition: 6.49≤f12 / (CT1+CT2)≤9.

72.

9. The optical imaging lens according to claim 1, characterized in that, 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 satisfy the following condition: 0.93≤ET1 / (ET2+ET3)≤1.

25.

10. The optical imaging lens according to claim 1, characterized in that, The edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, the center thickness CT4 of the fourth lens, and the center thickness CT5 of the fifth lens satisfy the following condition: 1.11≤(ET4+ET5) / (CT4+CT5)≤1.

13.

11. The optical imaging lens according to claim 1, characterized in that, The surface of the diffractive optical element has a diffraction surface, and the diffraction surface has multiple tooth structures, which form multiple concentric circles around the optical axis of the optical imaging lens.

Images