Optical imaging lens

Abstract

The present invention relates to an optical imaging lens. Among them, the lens includes a first lens with a convex object side surface and a negative optical power, which is arranged in sequence from the object side to the image side along the optical axis; a second lens; a third lens with a concave object side surface and a convex image side surface; a fourth lens with a convex object side surface; a fifth lens with a negative optical power; and a sixth lens. The maximum semi-field angle Semi-FOV of the optical imaging lens satisfies: 55 < Semi-FOV < 75. The central thickness CT1 of the first lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 0.55 < CT1 / (T12 + T23) < 1.80. The optical imaging lens with this structure has the characteristics of a large field of view, a long depth of field, and clear imaging, which is beneficial to providing a good imaging picture and can meet the needs of day and night security monitoring.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging, and particularly to an optical imaging lens, specifically an optical imaging lens composed of six lenses. Background Art

[0002] With the rapid development of modernization and economy in various regions, the necessity of building a harmonious society is increasing day by day. As a basic tool for ensuring the safety of residents' lives and property, the security monitoring system has become an important part of the harmonious development of society. Since the lens used in the security monitoring system has high requirements for the range of objects captured within a limited shooting range, a wide-angle lens has become the first choice in more cases.

[0003] To meet the needs of actual security monitoring application scenarios, there is an urgent need for an optical imaging lens with a wide shooting range and clear imaging. Summary of the Invention

[0004] The present invention aims to provide an optical imaging lens composed of six lenses, which is a wide-angle lens confocal in visible and infrared bands and can meet the security monitoring requirements for day and night use.

[0005] One aspect of the present invention provides an optical imaging lens, which includes, arranged in sequence from the object side to the image side along the optical axis:

[0006] A first lens with negative optical power, whose object side is convex;

[0007] A second lens;

[0008] A third lens, whose object side is concave and image side is convex;

[0009] A fourth lens, whose object side is convex;

[0010] A fifth lens with negative optical power;

[0011] A sixth lens;

[0012] Wherein, the maximum semi-field angle Semi - FOV of the optical imaging lens satisfies: 55 < Semi - FOV < 75;

[0013] The central thickness CT1 of the first lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 0.55 < CT1 / (T12 + T23) < 1.80.

[0014] According to an embodiment of the present invention, the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens satisfy: -1.0 < f / f1 < -0.4.

[0015] According to an embodiment of the present invention, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -0.8 < (f4 + f5) / f4 < 0.

[0016] According to an embodiment of the present invention, the distance BFL on the optical axis from the image side of the sixth lens to the imaging surface of the optical imaging lens and the combined focal length f34 of the third lens and the fourth lens satisfy: 0.2 < BFL / f34 < 1.2.

[0017] According to an embodiment of the present invention, the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0.4 < CT3 / CT4 < 1.6.

[0018] According to an embodiment of the present invention, the air gap T56 between the fifth lens and the sixth lens on the optical axis and the sum ∑AT of the air gaps between any two adjacent lenses among the first lens to the sixth lens on the optical axis satisfy: T56 / ∑AT < 0.6.

[0019] According to an embodiment of the present invention, the radius of curvature R2 of the image side of the first lens and the effective focal length f of the optical imaging lens satisfy: 0.3 < R2 / f < 0.8.

[0020] According to an embodiment of the present invention, the radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens satisfy: R6 / R5 < 1.0.

[0021] According to an embodiment of the present invention, the radius of curvature R7 of the object side of the fourth lens and the radius of curvature R8 of the image side of the fourth lens satisfy: |(R7 + R8) / (R7 - R8)| < 0.5.

[0022] According to an embodiment of the present invention, the axial distance SAG31 between the intersection point of the object side of the third lens and the optical axis and the vertex of the effective radius of the object side of the third lens and the axial distance SAG32 between the intersection point of the image side of the third lens and the optical axis and the vertex of the effective radius of the image side of the third lens satisfy: SAG31 / SAG32 < 1.2.

[0023] According to an embodiment of the present invention, the axial distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens and the axial distance SAG61 between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens satisfy: |(SAG51 + SAG61) / (SAG51 - SAG61)| < 1.8.

[0024] According to an embodiment of the present invention, half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens and the effective semi-aperture DT11 of the object side surface of the first lens satisfy: 0.4 < ImgH / DT11 < 1.2.

[0025] According to an embodiment of the present invention, the edge thickness ET6 of the sixth lens and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.4 < ET6 / CT6 < 1.0.

[0026] According to an embodiment of the present invention, the edge thickness ET3 of the third lens and the edge thickness ET2 of the second lens satisfy: ET3 / ET2 < 4.5.

[0027] According to an embodiment of the present invention, the working wavelength band of the optical imaging lens is 450 nm - 1000 nm.

[0028] According to an embodiment of the present invention, the optical imaging lens includes at least one glass aspherical lens.

[0029] Advantages of the present invention:

[0030] The optical imaging lens provided by the present invention includes multiple lenses, such as the first lens to the sixth lens. Among them, the first lens has a negative optical power and can effectively capture more light to achieve the characteristic of wide angle; the third lens adjusts the exit angle of the light, and its shape cooperates with the shape of the front second lens, which can effectively reduce coma; the fifth lens has a negative optical power, which is beneficial to the reasonable distribution of the optical power of the optical imaging lens and is easy to balance and correct various aberrations of the optical imaging lens; at the same time, it has the characteristics of large field of view, long depth of field, and clear imaging, which is beneficial to providing a good imaging picture. Description of the drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 Schematic diagram of the lens group structure of Embodiment 1 of the optical imaging lens of the present invention;

[0033] Figure 1a Astigmatism curve of Embodiment 1 of the optical imaging lens of the present invention;

[0034] Figure 1b Distortion curve of Embodiment 1 of the optical imaging lens of the present invention;

[0035] Figure 1c Diffraction defocus modulation transfer function diagram of Embodiment 1 of the optical imaging lens of the present invention from 0.4358 to 0.6563 um;

[0036] Figure 1d Diffraction defocus modulation transfer function diagram of Embodiment 1 of the optical imaging lens of the present invention from 0.8300 to 0.8700 um;

[0037] Figure 2 Schematic diagram of the lens group structure of Embodiment 2 of the optical imaging lens of the present invention;

[0038] Figure 2a Astigmatism curve of Embodiment 2 of the optical imaging lens of the present invention;

[0039] Figure 2b Distortion curve of Embodiment 2 of the optical imaging lens of the present invention;

[0040] Figure 2c Diffraction defocus modulation transfer function diagram of Embodiment 2 of the optical imaging lens of the present invention from 0.4358 to 0.6563 um;

[0041] Figure 2d Diffraction defocus modulation transfer function diagram of Embodiment 2 of the optical imaging lens of the present invention from 0.8300 to 0.8700 um;

[0042] Figure 3 Schematic diagram of the lens group structure of Embodiment 3 of the optical imaging lens of the present invention;

[0043] Figure 3a Astigmatism curve of Embodiment 3 of the optical imaging lens of the present invention;

[0044] Figure 3b Distortion curve of Embodiment 3 of the optical imaging lens of the present invention;

[0045] Figure 3c Diffraction defocus modulation transfer function diagram of Embodiment 3 of the optical imaging lens of the present invention from 0.4358 to 0.6563 um;

[0046] Figure 3dDiffraction defocus modulation transfer function diagram of Embodiment 3 of the optical imaging lens of the present invention from 0.8300 to 0.8700um;

[0047] Figure 4 Schematic diagram of the lens group structure of Embodiment 4 of the optical imaging lens of the present invention;

[0048] Figure 4a Astigmatism curve of Embodiment 4 of the optical imaging lens of the present invention;

[0049] Figure 4b Distortion curve of Embodiment 4 of the optical imaging lens of the present invention;

[0050] Figure 4c Diffraction defocus modulation transfer function diagram of Embodiment 4 of the optical imaging lens of the present invention from 0.4358 to 0.6563um;

[0051] Figure 4d Diffraction defocus modulation transfer function diagram of Embodiment 4 of the optical imaging lens of the present invention from 0.8300 to 0.8700um;

[0052] Figure 5 Schematic diagram of the lens group structure of Embodiment 5 of the optical imaging lens of the present invention;

[0053] Figure 5a Astigmatism curve of Embodiment 5 of the optical imaging lens of the present invention;

[0054] Figure 5b Distortion curve of Embodiment 5 of the optical imaging lens of the present invention;

[0055] Figure 5c Diffraction defocus modulation transfer function diagram of Embodiment 5 of the optical imaging lens of the present invention from 0.4358 to 0.6563um;

[0056] Figure 5d Diffraction defocus modulation transfer function diagram of Embodiment 5 of the optical imaging lens of the present invention from 0.8300 to 0.8700um;

[0057] Figure 6 Schematic diagram of the lens group structure of Embodiment 6 of the optical imaging lens of the present invention;

[0058] Figure 6a Astigmatism curve of Embodiment 6 of the optical imaging lens of the present invention;

[0059] Figure 6b Distortion curve of Embodiment 6 of the optical imaging lens of the present invention;

[0060] Figure 6c Diffraction defocus modulation transfer function diagram of Embodiment 6 of the optical imaging lens of the present invention from 0.4358 to 0.6563um;

[0061] Figure 6d It is the diffraction defocus modulation transfer function diagram of Embodiment 6 of the optical imaging lens of the present invention from 0.8300 to 0.8700 um;

[0062] Figure 7 It is the schematic diagram of the lens group structure of Embodiment 7 of the optical imaging lens of the present invention;

[0063] Figure 7a It is the astigmatism curve of Embodiment 7 of the optical imaging lens of the present invention;

[0064] Figure 7b It is the distortion curve of Embodiment 7 of the optical imaging lens of the present invention;

[0065] Figure 7c It is the diffraction defocus modulation transfer function diagram of Embodiment 7 of the optical imaging lens of the present invention from 0.4358 to 0.6563 um;

[0066] Figure 7d It is the diffraction defocus modulation transfer function diagram of Embodiment 7 of the optical imaging lens of the present invention from 0.8300 to 0.8700 um. Detailed implementation manners

[0067] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0068] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0069] It should also be understood that the terms "include", "include with", "have", "contain" and / or "contain with", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or their combinations. In addition, when an expression such as "at least one of......" appears after the list of listed features, it modifies the entire list of listed features, rather than modifying a single element in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0070] In the drawings, for ease of explanation, the thickness, dimensions, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are presented by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0071] In the description of the present invention, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface 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 to be photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0072] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) 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 manner unless expressly so defined herein.

[0073] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The features, principles, and other aspects of the present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0074] Exemplary Embodiments

[0075] The optical imaging lens according to the exemplary embodiment of the present invention includes six lenses, which are sequentially arranged from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Among them, each lens is independent of each other, and there is an air gap between the lenses on the optical axis.

[0076] In this exemplary embodiment, the first lens has a negative optical power, and its object side surface is convex; the third lens has a concave object side surface and a convex image side surface; the fourth lens has a convex object side surface; the fifth lens has a negative optical power. The first three lenses in the optical imaging lens play an important role in the incident and exit angles of light; the first lens has a negative optical power, which can effectively capture more light to achieve the wide-angle characteristic; the third lens adjusts the exit angle of light, and its shape cooperates with the shape of the second lens in front, which can effectively reduce coma; the fifth lens having a negative optical power is conducive to the reasonable distribution of the optical power of the optical imaging lens and is easy to balance and correct various aberrations of the optical imaging lens.

[0077] In the present exemplary embodiment, the conditional expression satisfied by the maximum semi-field of view Semi-FOV of the optical imaging lens is: 55 < Semi-FOV < 75. When the field of view satisfies this condition, the range of the scene observed from a certain viewpoint is much larger than that seen by the human eye at the same viewpoint; the depth of field is long, which can show a quite large clear range and can emphasize the perspective effect of the picture. More specifically, Semi-FOV satisfies: 58 < Semi-FOV < 70, for example: 60.7 ≤ Semi-FOV ≤ 68.6.

[0078] In the present exemplary embodiment, the conditional expression satisfied by the central thickness CT1 of the first lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis is: 0.55 < CT1 / (T12 + T23) < 1.80. By controlling the relationship between the first lens, the second lens, and the third lens, the field curvature and astigmatism generated by the light rays with large incident angles of the wide-angle lens can be effectively reduced, and the resolution of the lens edge field of view can be improved. More specifically, CT1, T12, and T23 satisfy: 0.60 < CT1 / (T12 + T23) < 1.70, for example: 0.63 ≤ CT1 / (T12 + T23) ≤ 1.62.

[0079] In the present exemplary embodiment, the conditional expression satisfied by the effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens is: -1.0 < f / f1 < -0.4. When this condition is satisfied, the proportional relationship of the focal lengths can be restricted, and the wide field of view can be effectively converged into the optical device, and the tolerance sensitivity of the optical device can be reduced. More specifically, -0.90 < f / f1 < -0.5, for example: -0.82 ≤ f / f1 ≤ -0.59.

[0080] In the present exemplary embodiment, the conditional expression satisfied by the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens is: -0.8 < (f4 + f5) / f4 < 0. When this condition is satisfied, it is beneficial to the optical power distribution and at the same time beneficial to the aberration balance of the optical imaging lens. More specifically, -0.70 < (f4 + f5) / f4 < -0.10, for example: -0.59 ≤ (f4 + f5) / f4 ≤ -0.19.

[0081] In the present exemplary embodiment, the condition formula satisfied by the distance BFL on the optical axis from the image side of the sixth lens to the imaging surface of the optical imaging lens and the combined focal length f34 of the third lens and the fourth lens is: 0.2 < BFL / f34 < 1.2. When this condition is met, the proportional relationship between the optical back focal length and the combined focal length of the third lens and the fourth lens can be restricted, and a wide field of view can be effectively converged into the optical device, and the tolerance sensitivity of the optical device can be reduced. More specifically, 0.30 < BFL / f34 < 1.0, for example: 0.56 ≤ BFL / f34 ≤ 0.9.

[0082] In the present exemplary embodiment, the condition formula satisfied by the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis is: 0.4 < CT3 / CT4 < 1.6. When this condition is met, the structures of the third lens and the fourth lens are reasonably allocated, making the lenses easy to assemble structurally and facilitating the reduction of ghost image effects. More specifically, 0.45 < CT3 / CT4 < 1.50, for example: 0.52 ≤ CT3 / CT4 ≤ 1.43.

[0083] In the present exemplary embodiment, the condition formula satisfied by the air gap T56 between the fifth lens and the sixth lens on the optical axis and the sum ∑AT of the air gaps between any two adjacent lenses among the first lens to the sixth lens on the optical axis is: T56 / ∑AT < 0.6. When this condition is met, the air gaps are reasonably allocated, ensuring miniaturization while reducing ghost image effects. More specifically, T56 / ∑AT < 0.5, for example: T56 / ∑AT ≤ 0.42.

[0084] In the present exemplary embodiment, the condition formula satisfied by the radius of curvature R2 of the image side of the first lens and the effective focal length f of the optical imaging lens is: 0.3 < R2 / f < 0.8. When this condition is met, the shape of the first lens is restricted, which is beneficial to balancing aberrations and ensuring the processability of the lens. More specifically, 0.4 < R2 / f < 0.7, for example: 0.45 ≤ R2 / f ≤ 0.68.

[0085] In the present exemplary embodiment, the condition formula satisfied by the radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens is: R6 / R5 < 1.0. When this condition is met, the shape of the third lens is restricted, which is beneficial to the optical imaging lens in balancing aberrations. More specifically, R6 / R5 < 0.95, for example: R6 / R5 ≤ 0.88.

[0086] In this exemplary embodiment, the conditional expression satisfied by the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens is: |(R7 + R8) / (R7 - R8)| < 0.5. When this condition is met, the shape of the fourth lens is restricted, which is beneficial to the aberration balance of the optical imaging lens and reduces ghost images. More specifically, |(R7 + R8) / (R7 - R8)| < 0.4, for example: |(R7 + R8) / (R7 - R8)| ≤ 0.3.

[0087] In this exemplary embodiment, the conditional expression satisfied by the axial distance SAG31 between the intersection point of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens and the axial distance SAG32 between the intersection point of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens is: SAG31 / SAG32 < 1.2. When this condition is met, the shape of the third lens is restricted, which helps the light to make a rapid transition in the system. More specifically, SAG31 / SAG32 < 1.1, for example: SAG31 / SAG32 ≤ 1.06.

[0088] In this exemplary embodiment, the conditional expression satisfied by the axial distance SAG51 between the intersection point of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens and the axial distance SAG61 between the intersection point of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens is: |(SAG51 + SAG61) / (SAG51 - SAG61)| < 1.8. When this condition is met, the shapes of the fifth lens and the sixth lens are restricted, which is beneficial to improving the relative illumination. More specifically, |(SAG51 + SAG61) / (SAG51 - SAG61)| < 1.6, for example: |(SAG51 + SAG61) / (SAG51 - SAG61)| ≤ 1.51.

[0089] In this exemplary embodiment, the conditional expression satisfied by half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens and the effective semi-aperture DT11 of the object side surface of the first lens is: 0.4 < ImgH / DT11 < 1.2. When this condition is met, the light input amount can be effectively increased, which is beneficial for the lens to meet the relative illumination requirements, improve the edge field illumination, and enhance the low-light performance of the optical imaging lens. More specifically, 0.5 < ImgH / DT11 < 1.1, for example: 0.66 ≤ ImgH / DT11 ≤ 1.05.

[0090] In the present exemplary embodiment, the conditional formula satisfied by the edge thickness ET6 of the sixth lens and the central thickness CT6 of the sixth lens on the optical axis is: 0.4 < ET6 / CT6 < 1.0. When this condition is satisfied, the shape of the sixth lens is restricted, which is beneficial to the aberration balance of the optical imaging lens. More specifically, 0.50 < ET6 / CT6 < 0.85, for example: 0.54 ≤ ET6 / CT6 ≤ 0.77.

[0091] In the present exemplary embodiment, the conditional formula satisfied by the edge thickness ET3 of the third lens and the edge thickness ET2 of the second lens is: ET3 / ET2 < 4.5. When this condition is satisfied, the shapes of the second lens and the third lens are restricted, and the optical system mechanism can be reasonably allocated to improve the processability. More specifically, ET3 / ET2 < 4.30, for example: ET3 / ET2 ≤ 4.01.

[0092] In the present exemplary embodiment, the working wavelength band of the optical imaging lens is 450 nm - 1000 nm. When this condition is satisfied, infrared-visible confocal can be achieved to meet the requirements of day and night use.

[0093] In the present exemplary embodiment, the optical imaging lens includes at least one glass aspherical lens. When this condition is satisfied, it is beneficial to the aberration balance of the optical imaging lens and improves the temperature stability.

[0094] In the present exemplary embodiment, the above optical imaging lens may further include a diaphragm. The diaphragm can be set at an appropriate position as needed. For example, the diaphragm can be set between the third lens and the fourth lens. 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.

[0095] The optical imaging lens according to the above embodiment of the present invention may adopt multiple lenses, such as the six lenses described above. By reasonably allocating the optical power, surface shape, central thickness of each lens, and the on-axis spacing between each lens, etc., the optical imaging lens has a large imaging image plane and has the characteristics of a wide imaging range and high imaging quality.

[0096] The optical imaging lens of the above embodiment is a wide-angle lens that combines the actual security monitoring application scenario and satisfies confocal in the visible and infrared wavelength bands, and can meet the security monitoring requirements of day and night use.

[0097] In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object side surface of the first lens to the image side surface of the sixth lens is an aspherical mirror surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging 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 of 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, both the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are aspherical mirror surfaces.

[0098] However, those skilled in the art should understand that without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the optical imaging lens is not limited to including six lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0099] The specific embodiments of the optical imaging lens applicable to the above embodiments will be further described below with reference to the accompanying drawings. Specific Embodiment 1

[0101] Figure 1 It is a schematic structural diagram of the lens group of Embodiment 1 of the optical imaging lens of the present invention. The optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15. Among them:

[0102] The first lens E1 has a negative optical power. Its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface; the second lens E2 has a positive optical power. Its object side surface S3 is a convex surface, and its image side surface S4 is a concave surface; the third lens E3 has a positive optical power. Its object side surface S5 is a concave surface, and its image side surface S6 is a convex surface; the fourth lens E4 has a positive optical power. Its object side surface S7 is a convex surface, and its image side surface S8 is a convex surface; the fifth lens E5 has a negative optical power. Its object side surface S9 is a concave surface, and its image side surface S10 is a concave surface; the sixth lens E6 has a positive optical power. Its object side surface S11 is a convex surface, and its image side surface S12 is a concave surface; the filter E7 has an object side surface S13 and an image side surface S14. The light from the object sequentially passes through the surfaces of S1 to S14 and finally forms an image on the imaging surface S15.

[0103] As shown in Table 1, it is the basic parameter table of the optical imaging lens in Embodiment 1. Among them, the unit of radius of curvature, focal length, and thickness / distance is millimeter (mm):

[0104]

[0105]

[0106] Table 1

[0107] As shown in Table 2, in Embodiment 1, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15 is 12.00 mm, half of the diagonal length of the effective pixel region on the imaging surface S15 is ImgH = 3.46 mm, the ratio of the effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is f / EPD = 2.08, and the total effective focal length f of the optical imaging lens is 3.08 mm. The parameters of each relationship are as explained in the exemplary embodiment, and the values of each relationship are listed in the following table:

[0108]

[0109] Table 2

[0110] The optical imaging lens in Embodiment 1 satisfies:

[0111] Semi-FOV = 60.7°, where Semi-FOV is the maximum half field of view angle of the optical imaging lens;

[0112] CT1 / (T12 + T23) = 0.81, where CT1 is the central thickness of the first lens on the optical axis, T12 is the air gap between the first lens and the second lens on the optical axis, and T23 is the air gap between the second lens and the third lens on the optical axis;

[0113] f / f1 = -0.61, where f is the effective focal length of the optical imaging lens and f1 is the effective focal length of the first lens;

[0114] (f4 + f5) / f4 = -0.59, where f4 is the effective focal length of the fourth lens and f5 is the effective focal length of the fifth lens;

[0115] BFL / f34 = 0.56, where BFL is the distance on the optical axis from the image side surface of the sixth lens to the imaging surface of the optical imaging lens, and f34 is the combined focal length of the third lens and the fourth lens;

[0116] CT3 / CT4 = 0.98, where CT3 is the central thickness of the third lens on the optical axis and CT4 is the central thickness of the fourth lens on the optical axis;

[0117] T56 / ∑AT = 0.38, where T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and ∑AT is the sum of the air gaps between any two adjacent lenses with optical power among the first lens to the sixth lens on the optical axis;

[0118] R2 / f = 0.68, where R2 is the radius of curvature of the image side of the first lens, and f is the effective focal length of the optical imaging lens;

[0119] R6 / R5 = 0.88, where R5 is the radius of curvature of the object side of the third lens, and R6 is the radius of curvature of the image side of the third lens;

[0120] |(R7 + R8) / (R7 - R8)| = 0.05, where R7 is the radius of curvature of the object side of the fourth lens, and R8 is the radius of curvature of the image side of the fourth lens;

[0121] SAG31 / SAG32 = 1.06, where SAG31 is the axial distance between the intersection point of the object side of the third lens and the optical axis and the vertex of the effective radius of the object side of the third lens, and SAG32 is the axial distance between the intersection point of the image side of the third lens and the optical axis and the vertex of the effective radius of the image side of the third lens;

[0122] |(SAG51 + SAG61) / (SAG51 - SAG61)| = 0.42, where SAG51 is the axial distance between the intersection point of the object side of the fifth lens and the optical axis and the vertex of the effective radius of the object side of the fifth lens, and SAG61 is the axial distance between the intersection point of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens;

[0123] Imgh / DT11 = 1.00, where ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, and DT11 is the effective semi-aperture of the object side of the first lens;

[0124] ET6 / CT6 = 0.59, where ET6 is the edge thickness of the sixth lens, and CT6 is the central thickness of the sixth lens on the optical axis;

[0125] ET3 / ET2 = 3.63, where ET3 is the edge thickness of the third lens, and ET2 is the edge thickness of the second lens.

[0126] In Embodiment 1, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0127]

[0128] Wherein, x is the sagitta, which is the distance from the vertex of the aspheric surface to the position along the optical axis at a height of h; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspheric surface.

[0129] In Embodiment 1, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are both aspheric surfaces. Table 3 shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 that can be used for the aspheric mirror surfaces S1 - S12 in Embodiment 1:

[0130]

[0131]

[0132] Table 3

[0133] Figure 1a is the astigmatism curve of Embodiment 1 of the optical imaging lens of the present invention; Figure 1b is the distortion curve of Embodiment 1 of the optical imaging lens of the present invention; Figure 1c is the diffraction defocus modulation transfer function graph of Embodiment 1 of the optical imaging lens of the present invention from 0.4358 to 0.6563 um. Each curve in the graph respectively reflects the resolution of each field of view. The horizontal axis in the graph is the amount of forward and backward movement of the image plane, that is, the focus shift, which is in millimeters. The graph shows the modulus of the optical transfer function, that is, the modulation transfer function (i.e., MTF), which describes the transfer characteristics of the system for the contrast of each frequency component and is equal to the contrast of the output image / the contrast of the input image. The spatial frequency in this graph is 50.0000 cycles per millimeter; Figure 1d is the diffraction defocus modulation transfer function graph of Embodiment 1 of the optical imaging lens of the present invention from 0.8300 to 0.8700 um. Each curve in the graph respectively reflects the resolution of each field of view. The horizontal axis in the graph is the amount of forward and backward movement of the image plane, that is, the focus shift, which is in millimeters. The graph shows the modulus of the optical transfer function, that is, the modulation transfer function (i.e., MTF), which describes the transfer characteristics of the system for the contrast of each frequency component and is equal to the contrast of the output image / the contrast of the input image. The spatial frequency in this graph is 50.0000 cycles per millimeter. From Figure 1c and Figure 1d it can be seen the imaging quality of the optical imaging lens in this embodiment. As shown by the curves in the figure being relatively concentrated and having good peaks, it can be known that the imaging quality of this lens is high. According to Figures 1a to 1d shown, the optical imaging lens given in Embodiment 1 can achieve good imaging quality. Specific Embodiment 2

[0135] Figure 2 This is a schematic diagram of the lens group structure of Embodiment 2 of the optical imaging lens of the present invention. The optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15. Among them:

[0136] The first lens E1 has a negative optical power. Its object surface S1 is convex, and its image surface S2 is concave; the second lens E2 has a positive optical power. Its object surface S3 is convex, and its image surface S4 is concave; the third lens E3 has a positive optical power. Its object surface S5 is concave, and its image surface S6 is convex; the fourth lens E4 has a positive optical power. Its object surface S7 is convex, and its image surface S8 is convex; the fifth lens E5 has a negative optical power. Its object surface S9 is concave, and its image surface S10 is concave; the sixth lens E6 has a positive optical power. Its object surface S11 is convex, and its image surface S12 is concave; the filter E7 has an object surface S13 and an image surface S14. The light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0137] As shown in Table 4, it is the basic parameter table of the optical imaging lens of Embodiment 2. Among them, the unit of the radius of curvature, focal length, and thickness / distance is millimeter (mm):

[0138]

[0139]

[0140] Table 4

[0141] As shown in Table 5, in Embodiment 2, the distance TTL on the optical axis from the object surface S1 of the first lens E1 to the imaging surface S15 is 12.00 mm, half of the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 3.46 mm, the ratio of the effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is f / EPD = 2.08, and the total effective focal length f of the optical imaging lens is 2.80 mm. The parameters of each relationship are as explained in the exemplary embodiment, and the values of each relationship are listed in the following table:

[0142]

[0143] Table 5

[0144] In Embodiment 2, the object surface and the image surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 6 shows the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 that can be used for the aspherical mirror surfaces S1 - S12 in Embodiment 2:

[0145]

[0146]

[0147] Table 6

[0148] Figure 2a It is the astigmatism curve of Embodiment 2 of the optical imaging lens of the present invention; Figure 2b It is the distortion curve of Embodiment 2 of the optical imaging lens of the present invention; Figure 2c It is the diffraction defocus modulation transfer function diagram of Embodiment 2 of the optical imaging lens of the present invention from 0.4358 to 0.6563 um. Each curve in the figure respectively reflects the resolution of each field of view. The horizontal axis in the figure is the amount of forward and backward movement of the image plane, that is, the focus shift, which is in millimeters. The figure shows the modulus of the optical transfer function, that is, the modulation transfer function (i.e., MTF), which describes the transfer characteristics of the system for the contrast of each frequency component, equal to the contrast of the output image / the contrast of the input image. The spatial frequency in this figure is 50.0000 cycles per millimeter; Figure 2d It is the diffraction defocus modulation transfer function diagram of Embodiment 2 of the optical imaging lens of the present invention from 0.8300 to 0.8700 um. Each curve in the figure respectively reflects the resolution of each field of view. The horizontal axis in the figure is the amount of forward and backward movement of the image plane, that is, the focus shift, which is in millimeters. The figure shows the modulus of the optical transfer function, that is, the modulation transfer function (i.e., MTF), which describes the transfer characteristics of the system for the contrast of each frequency component, equal to the contrast of the output image / the contrast of the input image. The spatial frequency in this figure is 50.0000 cycles per millimeter. From Figure 2c and Figure 2d it can be seen the imaging quality of the optical imaging lens in this embodiment. As shown in the figure, each curve is relatively concentrated and the peak value is relatively good. Thus, it can be known that the imaging quality of this lens is high. According to Figures 2a to 2d as shown, the optical imaging lens given in Embodiment 2 can achieve good imaging quality. Specific Embodiment 3

[0150] Figure 3 It is a schematic structural diagram of the lens group of Embodiment 3 of the optical imaging lens of the present invention. The optical imaging lens includes: a first lens E1, a second lens E2, a third lens E3, a diaphragm STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15, which are sequentially arranged along the optical axis from the object side to the image side. Among them:

[0151] The first lens E1 has a negative focal power, its object side S1 is convex, and its image side S2 is concave; the second lens E2 has a positive focal power, its object side S3 is convex, and its image side S4 is concave; the third lens E3 has a positive focal power, its object side S5 is concave, and its image side S6 is convex; the fourth lens E4 has a positive focal power, its object side S7 is convex, and its image side S8 is convex; the fifth lens E5 has a negative focal power, its object side S9 is concave, and its image side S10 is convex; the sixth lens E6 has a negative focal power, its object side S11 is convex, and its image side S12 is concave; the filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the surfaces of S1 to S14 and finally forms an image on the imaging surface S15.

[0152] As shown in Table 7, it is the basic parameter table of the optical imaging lens of Embodiment 3. Among them, the unit of the radius of curvature, focal length, and thickness / distance is millimeter (mm):

[0153]

[0154]

[0155] Table 7

[0156] As shown in Table 8, in Embodiment 3, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S15 is 11.93 mm, half of the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 3.46 mm, the ratio of the effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is f / EPD = 2.08, and the total effective focal length f of the optical imaging lens is 2.83 mm. The parameters of each relationship are as explained in the exemplary embodiment, and the values of each relationship are listed in the following table:

[0157]

[0158] Table 8

[0159] In Embodiment 3, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 9 shows the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 of the aspherical mirror surfaces S1-S12 that can be used in Embodiment 3:

[0160]

[0161]

[0162] Table 9

[0163] Figure 3aIt is the astigmatism curve of Embodiment 3 of the optical imaging lens of the present invention; Figure 3b It is the distortion curve of Embodiment 3 of the optical imaging lens of the present invention; Figure 3c It is the diffraction defocus modulation transfer function diagram of Embodiment 3 of the optical imaging lens of the present invention from 0.4358 to 0.6563um. Each curve in the figure respectively reflects the resolution of each field of view. The horizontal axis in the figure is the amount of forward and backward movement of the image plane, that is, the focus shift, which is in millimeters. The figure reflects the modulus of the optical transfer function, that is, the modulation transfer function (i.e., MTF), which describes the transfer characteristics of the system to the contrast of each frequency component and is equal to the contrast of the output image / the contrast of the input image. The spatial frequency in this figure is 50.0000 cycles per millimeter; Figure 3d It is the diffraction defocus modulation transfer function diagram of Embodiment 3 of the optical imaging lens of the present invention from 0.8300 to 0.8700um. Each curve in the figure respectively reflects the resolution of each field of view. The horizontal axis in the figure is the amount of forward and backward movement of the image plane, that is, the focus shift, which is in millimeters. The figure reflects the modulus of the optical transfer function, that is, the modulation transfer function (i.e., MTF), which describes the transfer characteristics of the system to the contrast of each frequency component and is equal to the contrast of the output image / the contrast of the input image. The spatial frequency in this figure is 50.0000 cycles per millimeter. From Figure 3c and Figure 3d it can be seen the imaging quality of the optical imaging lens in this embodiment. As shown in the figure, each curve is relatively concentrated and the peak is relatively good. Thus, it can be known that the imaging quality of this lens is high. According to Figures 3a to 3d as shown, the optical imaging lens given in Embodiment 3 can achieve good imaging quality. Specific Embodiment 4

[0165] Figure 4 It is the schematic structural diagram of the lens group of Embodiment 4 of the optical imaging lens of the present invention. The optical imaging lens includes: a first lens E1, a second lens E2, a third lens E3, a diaphragm STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15, which are sequentially arranged along the optical axis from the object side to the image side. Among them:

[0166] The first lens E1 has a negative optical power, its object side S1 is convex, and its image side S2 is concave; the second lens E2 has a positive optical power, its object side S3 is convex, and its image side S4 is concave; the third lens E3 has a positive optical power, its object side S5 is concave, and its image side S6 is convex; the fourth lens E4 has a positive optical power, its object side S7 is convex, and its image side S8 is convex; the fifth lens E5 has a negative optical power, its object side S9 is concave, and its image side S10 is concave; the sixth lens E6 has a positive optical power, its object side S11 is convex, and its image side S12 is concave; the filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the surfaces of S1 to S14 and finally forms an image on the imaging surface S15.

[0167] As shown in Table 10, it is the basic parameter table of the optical imaging lens of Embodiment 4. Among them, the unit of the radius of curvature, focal length, and thickness / distance is millimeter (mm):

[0168]

[0169] Table 10

[0170] As shown in Table 11, in Embodiment 4, the distance TTL from the object side S1 of the first lens E1 to the imaging surface S15 on the optical axis is 12.00 mm, half of the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 3.46 mm, the ratio of the effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is f / EPD = 2.08, and the total effective focal length f of the optical imaging lens is 2.79 mm. The parameters of each relationship are as explained in the exemplary embodiment, and the values of each relationship are listed in the following table:

[0171]

[0172] Table 11

[0173] In Embodiment 4, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 12 shows the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 of the aspherical mirror surfaces S1 - S12 that can be used in Embodiment 4:

[0174] Face number A4 A6 A8 A10 A12 S1 -1.92E-03 8.88E-05 7.25E-06 -4.75E-07 -1.04E-07 S2 -1.35E-02 -3.98E-03 8.35E-03 -1.34E-02 1.16E-02 S3 9.51E-02 -2.13E-01 2.38E-01 -2.06E-01 1.27E-01 S4 3.52E-02 -6.34E-02 3.81E-02 -1.04E-02 -2.90E-03 S5 6.14E-03 -2.41E-03 -9.38E-03 3.29E-02 -7.19E-02 S6 2.96E-02 -6.01E-02 1.01E-01 -1.37E-01 1.28E-01 S7 3.47E-02 -5.28E-02 4.80E-02 -3.16E-02 1.26E-02 S8 -2.11E-01 4.21E-01 -6.27E-01 6.55E-01 -4.58E-01 S9 -1.81E-01 3.77E-01 -5.73E-01 6.14E-01 -4.58E-01 S10 -8.62E-02 1.55E-01 -1.86E-01 1.59E-01 -9.32E-02 S11 2.44E-02 -2.94E-02 2.13E-02 -9.87E-03 2.99E-03 S12 -5.51E-03 -3.93E-03 7.60E-05 1.97E-03 -1.61E-03 Face number A14 A16 A18 A20 A22 S1 1.80E-08 -1.29E-09 5.00E-11 -1.03E-12 8.87E-15 S2 -6.15E-03 2.01E-03 -4.02E-04 4.47E-05 -2.13E-06 S3 -5.19E-02 1.32E-02 -1.92E-03 1.21E-04 0.00E+00 S4 6.74E-03 -3.86E-03 9.25E-04 -6.13E-05 0.00E+00 S5 9.36E-02 -7.31E-02 3.39E-02 -8.58E-03 9.17E-04 S6 -7.77E-02 2.93E-02 -6.18E-03 5.60E-04 0.00E+00 S7 -2.72E-03 2.24E-04 0.00E+00 0.00E+00 0.00E+00 S8 2.04E-01 -5.21E-02 6.05E-03 -8.38E-05 0.00E+00 S9 2.26E-01 -6.93E-02 1.16E-02 -7.83E-04 0.00E+00 S10 3.53E-02 -7.90E-03 8.80E-04 -2.87E-05 0.00E+00 S11 -5.84E-04 7.04E-05 -4.76E-06 1.37E-07 0.00E+00 S12 6.95E-04 -1.90E-04 3.47E-05 -4.30E-06 3.55E-07

[0175] Table 12

[0176] Figure 4a It is the astigmatism curve of Embodiment 4 of the optical imaging lens of the present invention; Figure 4b It is the distortion curve of Embodiment 4 of the optical imaging lens of the present invention; Figure 4cThis is the diffraction defocus modulation transfer function graph of Embodiment 4 of the optical imaging lens of the present invention from 0.4358 to 0.6563 um. Each curve in the graph respectively reflects the resolution of each field of view. The horizontal axis in the graph is the amount of forward and backward movement of the image plane, that is, the focus shift, which is in millimeters. The graph shows the modulus of the optical transfer function, that is, the modulation transfer function (i.e., MTF), which describes the transfer characteristics of the system for the contrast of each frequency component and is equal to the contrast of the output image / the contrast of the input image. The spatial frequency in this graph is 50.0000 cycles per millimeter; Figure 4d This is the diffraction defocus modulation transfer function graph of Embodiment 4 of the optical imaging lens of the present invention from 0.8300 to 0.8700 um. Each curve in the graph respectively reflects the resolution of each field of view. The horizontal axis in the graph is the amount of forward and backward movement of the image plane, that is, the focus shift, which is in millimeters. The graph shows the modulus of the optical transfer function, that is, the modulation transfer function (i.e., MTF), which describes the transfer characteristics of the system for the contrast of each frequency component and is equal to the contrast of the output image / the contrast of the input image. The spatial frequency in this graph is 50.0000 cycles per millimeter. From Figure 4c and Figure 4d it can be seen the imaging quality of the optical imaging lens in this embodiment. As shown in the figure, each curve is relatively concentrated and the peak is relatively good, so it can be known that the imaging quality of this lens is high. According to Figures 4a to 4d what is shown, the optical imaging lens given in Embodiment 4 can achieve good imaging quality. Specific Embodiment 5

[0178] Figure 5 This is a schematic structural diagram of the lens group of Embodiment 5 of the optical imaging lens of the present invention. The optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15. Among them:

[0179] The first lens E1 has a negative optical power. Its object side surface S1 is a convex surface and its image side surface S2 is a concave surface; the second lens E2 has a positive optical power. Its object side surface S3 is a convex surface and its image side surface S4 is a concave surface; the third lens E3 has a positive optical power. Its object side surface S5 is a concave surface and its image side surface S6 is a convex surface; the fourth lens E4 has a positive optical power. Its object side surface S7 is a convex surface and its image side surface S8 is a convex surface; the fifth lens E5 has a negative optical power. Its object side surface S9 is a concave surface and its image side surface S10 is a concave surface; the sixth lens E6 has a positive optical power. Its object side surface S11 is a convex surface and its image side surface S12 is a concave surface; the filter E7 has an object side surface S13 and an image side surface S14. The light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0180] As shown in Table 13, it is the basic parameter table of the optical imaging lens in Embodiment 5. Among them, the unit of radius of curvature, focal length, and thickness / distance is millimeter (mm):

[0181]

[0182] Table 13

[0183] As shown in Table 14, in Embodiment 5, the distance TTL from the object side S1 of the first lens E1 to the imaging surface S15 on the optical axis is 12.01 mm, half of the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 3.46 mm, the ratio of the effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is f / EPD = 2.09, and the total effective focal length f of the optical imaging lens is 3.07 mm. The parameters of each relational expression are as explained in the exemplary embodiment, and the values of each relational expression are listed in the following table:

[0184]

[0185] Table 14

[0186] In Embodiment 5, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 15 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 of the aspherical mirror surfaces S1 - S12 that can be used in Embodiment 5:

[0187] Face number A4 A6 A8 A10 A12 S1 9.50E-03 -3.55E-03 5.20E-04 8.18E-05 -6.13E-05 S2 1.32E-02 8.85E-03 -3.34E-02 3.07E-02 -1.19E-02 S3 1.02E-01 -2.10E-01 2.43E-01 -2.20E-01 1.36E-01 S4 1.14E-02 -3.24E-02 2.75E-03 1.78E-02 -2.75E-02 S5 5.07E-03 -2.41E-03 -6.26E-03 1.92E-02 -3.98E-02 S6 5.19E-03 -1.90E-02 4.24E-02 -6.49E-02 6.27E-02 S7 -3.23E-03 -1.74E-03 -9.69E-03 1.52E-02 -1.15E-02 S8 -1.58E-01 3.73E-01 -5.74E-01 6.18E-01 -4.66E-01 S9 -2.10E-01 4.39E-01 -6.20E-01 6.38E-01 -4.72E-01 S10 -9.80E-02 1.42E-01 -1.44E-01 1.13E-01 -6.45E-02 S11 1.53E-02 -1.94E-02 1.32E-02 -5.82E-03 1.72E-03 S12 -6.39E-03 -5.99E-03 2.31E-03 5.06E-04 -9.64E-04 Face number A14 A16 A18 A20 A22 S1 1.55E-05 -2.19E-06 1.83E-07 -8.42E-09 1.65E-10 S2 -1.86E-03 3.97E-03 -1.71E-03 3.38E-04 -2.63E-05 S3 -5.32E-02 1.25E-02 -1.63E-03 9.02E-05 0.00E+00 S4 2.51E-02 -1.24E-02 3.04E-03 -2.92E-04 0.00E+00 S5 4.69E-02 -3.16E-02 1.21E-02 -2.48E-03 2.11E-04 S6 -3.80E-02 1.40E-02 -2.85E-03 2.47E-04 0.00E+00 S7 4.30E-03 -6.47E-04 0.00E+00 0.00E+00 0.00E+00 S8 2.36E-01 -7.59E-02 1.39E-02 -1.10E-03 0.00E+00 S9 2.40E-01 -7.86E-02 1.48E-02 -1.22E-03 0.00E+00 S10 2.54E-02 -6.45E-03 9.43E-04 -5.99E-05 0.00E+00 S11 -3.36E-04 4.19E-05 -3.00E-06 9.44E-08 0.00E+00 S12 4.97E-04 -1.47E-04 2.82E-05 -3.62E-06 3.07E-07

[0188] Table 15

[0189] Figure 5a It is the astigmatism curve of Embodiment 5 of the optical imaging lens of the present invention; Figure 5b It is the distortion curve of Embodiment 5 of the optical imaging lens of the present invention; Figure 5c It is the diffraction defocus modulation transfer function diagram of Embodiment 5 of the optical imaging lens of the present invention from 0.4358 to 0.6563 um. Each curve in the figure respectively reflects the resolution of each field of view. The horizontal axis in the figure is the amount of forward and backward movement of the image plane, that is, the focus shift, which is in millimeters. The figure shows the modulus of the optical transfer function, that is, the modulation transfer function (i.e., MTF), which describes the transfer characteristics of the system to the contrast of each frequency component and is equal to the contrast of the output image / the contrast of the input image. The spatial frequency in this figure is 50.0000 cycles per millimeter; Figure 5dThis is the diffraction defocus modulation transfer function graph of Embodiment 5 of the optical imaging lens of the present invention from 0.8300 to 0.8700 um. Each curve in the graph reflects the resolution of each field of view. The horizontal axis in the graph represents the amount of forward and backward movement of the image plane, that is, the focus shift, which is in millimeters. The graph shows the modulus of the optical transfer function, that is, the modulation transfer function (i.e., MTF), which describes the transfer characteristics of the system for the contrast of each frequency component and is equal to the contrast of the output image / the contrast of the input image. The spatial frequency in this graph is 50.0000 cycles per millimeter. From Figure 5c and Figure 5d it can be seen the imaging quality of the optical imaging lens in this embodiment. As shown in the figure, each curve is relatively concentrated and the peak is relatively good. From this, it can be known that the imaging quality of this lens is high. According to Figures 5a to 5d shown, the optical imaging lens given in Embodiment 5 can achieve good imaging quality. Specific Embodiment 6

[0191] Figure 6 This is a schematic structural diagram of the lens group of Embodiment 6 of the optical imaging lens of the present invention. The optical imaging lens includes: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15, which are arranged in sequence from the object side to the image side along the optical axis. Among them:

[0192] The first lens E1 has a negative optical power. Its object side surface S1 is a convex surface and its image side surface S2 is a concave surface; the second lens E2 has a negative optical power. Its object side surface S3 is a convex surface and its image side surface S4 is a concave surface; the third lens E3 has a positive optical power. Its object side surface S5 is a concave surface and its image side surface S6 is a convex surface; the fourth lens E4 has a positive optical power. Its object side surface S7 is a convex surface and its image side surface S8 is a convex surface; the fifth lens E5 has a negative optical power. Its object side surface S9 is a concave surface and its image side surface S10 is a concave surface; the sixth lens E6 has a positive optical power. Its object side surface S11 is a convex surface and its image side surface S12 is a concave surface; the filter E7 has an object side surface S13 and an image side surface S14. The light from the object sequentially passes through the surfaces of S1 to S14 and finally forms an image on the imaging surface S15.

[0193] As shown in Table 16, it is the basic parameter table of the optical imaging lens of Embodiment 6. Among them, the unit of the radius of curvature, focal length, and thickness / distance is millimeter (mm):

[0194]

[0195] Table 16

[0196] As shown in Table 17, in Example 6, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 on the optical axis is 11.99 mm, half of the diagonal length of the effective pixel region on the imaging surface S15 is ImgH = 3.58 mm, the ratio of the effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is f / EPD = 2.02, and the total effective focal length f of the optical imaging lens is 2.84 mm. The parameters of each relationship are as explained in the exemplary embodiment, and the values of each relationship are listed in the following table:

[0197]

[0198] Table 17

[0199] In Example 6, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 18 shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 of the aspherical mirror surfaces S1 - S12 that can be used in Example 6:

[0200] Face number A4 A6 A8 A10 A12 S1 -4.63E-03 -2.42E-03 1.47E-03 -4.59E-04 9.83E-05 S2 -2.31E-02 -1.53E-02 1.45E-02 -1.59E-02 1.97E-02 S3 -1.83E-02 -1.16E-02 2.70E-02 -4.55E-02 4.98E-02 S4 5.59E-03 -8.40E-02 3.23E-01 -7.79E-01 1.26E+00 S5 9.24E-03 9.80E-03 -2.07E-01 7.77E-01 -1.66E+00 S6 3.02E-02 -9.72E-02 1.57E-01 -2.08E-01 2.42E-01 S7 2.64E-02 -1.35E-01 2.25E-01 -2.63E-01 2.25E-01 S8 -4.30E-02 -3.35E-02 8.14E-02 -9.86E-02 9.51E-02 S9 -8.25E-02 5.47E-02 3.77E-02 -8.12E-02 8.12E-02 S10 -8.83E-02 9.80E-02 -1.42E-02 -4.43E-02 5.80E-02 S11 -2.56E-02 1.34E-02 -4.09E-03 6.72E-04 7.05E-05 S12 -6.11E-03 -7.30E-03 5.37E-03 -2.56E-03 8.44E-04 Face number A14 A16 A18 A20 A22 S1 -1.43E-05 1.37E-06 -8.16E-08 2.75E-09 -3.95E-11 S2 -1.83E-02 1.06E-02 -3.60E-03 6.65E-04 -5.10E-05 S3 -3.56E-02 1.65E-02 -4.73E-03 7.68E-04 -5.38E-05 S4 -1.36E+00 9.85E-01 -4.62E-01 1.28E-01 -1.62E-02 S5 2.26E+00 -1.95E+00 1.04E+00 -3.08E-01 3.91E-02 S6 -2.31E-01 1.59E-01 -7.16E-02 1.85E-02 -2.08E-03 S7 -1.37E-01 5.69E-02 -1.53E-02 2.38E-03 -1.63E-04 S8 -6.65E-02 3.06E-02 -8.67E-03 1.37E-03 -9.28E-05 S9 -5.79E-02 2.78E-02 -8.30E-03 1.38E-03 -9.67E-05 S10 -4.19E-02 1.88E-02 -5.10E-03 7.66E-04 -4.88E-05 S11 -7.14E-05 1.84E-05 -2.46E-06 1.72E-07 -4.97E-09 S12 -1.91E-04 2.88E-05 -2.78E-06 1.55E-07 -3.77E-09

[0201] Table 18

[0202] Figure 6a is the astigmatism curve of Example 6 of the optical imaging lens of the present invention; Figure 6b is the distortion curve of Example 6 of the optical imaging lens of the present invention; Figure 6c is the diffraction defocus modulation transfer function diagram of Example 6 of the optical imaging lens of the present invention from 0.4358 to 0.6563 um. Each curve in the figure represents the resolution of each field of view. The horizontal axis in the figure is the amount of forward and backward movement of the imaging surface, that is, the focus shift, which is in millimeters. The figure shows the modulus of the optical transfer function, that is, the modulation transfer function (i.e., MTF), which describes the transfer characteristics of the system for the contrast of each frequency component and is equal to the contrast of the output image / the contrast of the input image. The spatial frequency in this figure is 50.0000 cycles per millimeter; Figure 6d is the diffraction defocus modulation transfer function diagram of Example 6 of the optical imaging lens of the present invention from 0.8300 to 0.8700 um. Each curve in the figure represents the resolution of each field of view. The horizontal axis in the figure is the amount of forward and backward movement of the imaging surface, that is, the focus shift, which is in millimeters. The figure shows the modulus of the optical transfer function, that is, the modulation transfer function (i.e., MTF), which describes the transfer characteristics of the system for the contrast of each frequency component and is equal to the contrast of the output image / the contrast of the input image. The spatial frequency in this figure is 50.0000 cycles per millimeter. From Figure 6c And Figure 6dIt can be seen that the imaging quality of the optical imaging lens in this embodiment is such that the curves shown in the figure are relatively concentrated and the peaks are relatively good, from which it can be known that the imaging quality of this lens is high. According to Figures 6a to 6d As can be seen from the figure, the optical imaging lens given in Embodiment 6 can achieve good imaging quality. Specific Embodiment 7

[0204] Figure 7 FIG. is a schematic structural diagram of a lens group of Embodiment 7 of the optical imaging lens of the present invention. The optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15. Among them:

[0205] The first lens E1 has a negative optical power. Its object side surface S1 is convex and its image side surface S2 is concave; the second lens E2 has a positive optical power. Its object side surface S3 is convex and its image side surface S4 is concave; the third lens E3 has a positive optical power. Its object side surface S5 is concave and its image side surface S6 is convex; the fourth lens E4 has a positive optical power. Its object side surface S7 is convex and its image side surface S8 is convex; the fifth lens E5 has a negative optical power. Its object side surface S9 is concave and its image side surface S10 is convex; the sixth lens E6 has a positive optical power. Its object side surface S11 is convex and its image side surface S12 is concave; the filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the surfaces of S1 to S14 and finally forms an image on the imaging surface S15.

[0206] As shown in Table 19, it is a basic parameter table of the optical imaging lens of Embodiment 7. Among them, the unit of radius of curvature, focal length, and thickness / distance is millimeter (mm):

[0207]

[0208] Table 19

[0209] As shown in Table 20, in Embodiment 7, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 on the optical axis is 11.99 mm, half of the diagonal length of the effective pixel region on the imaging surface S15 is ImgH = 3.58 mm, the ratio of the effective focal length f of the optical imaging lens to the entrance pupil diameter EPD of the optical imaging lens is f / EPD = 2.02, and the total effective focal length f of the optical imaging lens is 2.84 mm. The parameters of each relationship are as explained in the exemplary embodiment, and the values of each relationship are listed in the following table:

[0210]

[0211]

[0212] Table 20

[0213] In Embodiment 7, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 21 shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 of the aspherical mirror surfaces S1 - S12 that can be used in Embodiment 7:

[0214] Face number A4 A6 A8 A10 A12 S1 -1.03E-03 -1.61E-04 1.28E-04 -3.19E-05 4.92E-06 S2 -2.56E-02 1.06E-02 -2.77E-02 1.94E-02 1.73E-02 S3 1.94E-01 -6.34E-01 1.07E+00 -1.32E+00 1.10E+00 S4 -7.66E-03 -8.11E-02 6.38E-02 1.16E-01 -4.20E-01 S5 9.58E-03 4.30E-02 -2.56E-01 8.06E-01 -1.47E+00 S6 2.90E-02 -5.45E-02 9.10E-02 -1.29E-01 1.21E-01 S7 8.54E-02 -8.17E-02 7.53E-02 -6.33E-02 3.76E-02 S8 -5.18E-01 1.45E+00 -2.94E+00 3.86E+00 -3.32E+00 S9 -4.80E-01 1.35E+00 -2.70E+00 3.53E+00 -3.05E+00 S10 7.62E-03 2.36E-02 -6.29E-02 9.85E-02 -8.64E-02 S11 -1.74E-02 -2.03E-03 -8.26E-05 2.88E-03 -2.19E-03 S12 -8.49E-03 -2.01E-02 2.27E-02 -1.66E-02 8.36E-03 Face number A14 A16 A18 A20 A22 S1 -4.69E-07 2.62E-08 -7.26E-10 3.44E-12 1.79E-13 S2 -4.77E-02 4.35E-02 -2.07E-02 5.15E-03 -5.30E-04 S3 -5.95E-01 1.98E-01 -3.68E-02 2.92E-03 0.00E+00 S4 5.32E-01 -3.36E-01 1.06E-01 -1.33E-02 0.00E+00 S5 1.58E+00 -1.02E+00 3.86E-01 -7.84E-02 6.53E-03 S6 -7.18E-02 2.53E-02 -4.79E-03 3.62E-04 0.00E+00 S7 -1.32E-02 1.86E-03 0.00E+00 0.00E+00 0.00E+00 S8 1.85E+00 -6.46E-01 1.28E-01 -1.10E-02 0.00E+00 S9 1.71E+00 -6.02E-01 1.20E-01 -1.05E-02 0.00E+00 S10 4.46E-02 -1.36E-02 2.29E-03 -1.64E-04 0.00E+00 S11 7.30E-04 -1.28E-04 1.21E-05 -6.83E-07 0.00E+00 S12 -2.92E-03 7.17E-04 -1.24E-04 1.49E-05 -1.20E-06

[0215] Table 21

[0216] Figure 7a is the astigmatism curve of Embodiment 7 of the optical imaging lens of the present invention; Figure 7b is the distortion curve of Embodiment 7 of the optical imaging lens of the present invention; Figure 7c is the diffraction defocus modulation transfer function diagram of Embodiment 7 of the optical imaging lens of the present invention from 0.4358 to 0.6563 um. Each curve in the figure respectively reflects the resolution of each field of view. The horizontal axis in the figure is the amount of forward and backward movement of the image plane, that is, the focus shift, which is in millimeters. The figure shows the modulus of the optical transfer function, that is, the modulation transfer function (i.e., MTF), which describes the transfer characteristic of the system for the contrast of each frequency component and is equal to the contrast of the output image / the contrast of the input image. The spatial frequency in this figure is 50.0000 cycles per millimeter; Figure 7d is the diffraction defocus modulation transfer function diagram of Embodiment 7 of the optical imaging lens of the present invention from 0.8300 to 0.8700 um. Each curve in the figure respectively reflects the resolution of each field of view. The horizontal axis in the figure is the amount of forward and backward movement of the image plane, that is, the focus shift, which is in millimeters. The figure shows the modulus of the optical transfer function, that is, the modulation transfer function (i.e., MTF), which describes the transfer characteristic of the system for the contrast of each frequency component and is equal to the contrast of the output image / the contrast of the input image. The spatial frequency in this figure is 50.0000 cycles per millimeter. From Figure 7c and Figure 7d it can be seen the imaging quality of the optical imaging lens in this embodiment. As shown in the figure, each curve is relatively concentrated and the peak value is relatively good. Thus, it can be known that the imaging quality of this lens is high. According to Figures 7a to 7d shown, the optical imaging lens given in Embodiment 7 can achieve good imaging quality.

[0217] Advantages of the present invention:

[0218] The optical imaging lens provided by the present invention includes multiple lenses, such as the first lens to the sixth lens. Among them, the first lens has a negative optical power, which can effectively capture more light to achieve the characteristic of wide angle; the third lens adjusts the exit angle of the light, and its shape cooperates with the shape of the second lens in front, which can effectively reduce coma; the fifth lens has a negative optical power, which is beneficial to the reasonable distribution of the optical power of the optical imaging lens and is easy to balance and correct various aberrations of the optical imaging lens; at the same time, it has the characteristics of large field of view, long depth of field and clear imaging, which is beneficial to providing a good imaging picture.

[0219] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, improvements, equivalent replacements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that, The number of lenses with optical power in the optical imaging lens is six, and the optical imaging lens includes, arranged in sequence from the object side to the image side along the optical axis: A first lens with negative optical power, having a convex object side and a concave image side; A second lens with positive optical power, having a convex object side and a concave image side; A third lens with positive optical power, having a concave object side and a convex image side; A fourth lens with positive optical power, having a convex object side and a convex image side; A fifth lens with negative optical power, having a concave object side; A sixth lens with positive optical power, having a convex object side and a concave image side; At least one of the second lens and the sixth lens has positive optical power; Wherein, the maximum half field of view Semi - FOV of the optical imaging lens satisfies: 60.7 ≤ Semi - FOV ≤ 68.8; The central thickness CT1 of the first lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 0.63 ≤ CT1 / (T12 + T23) ≤ 1.62; Half of the diagonal length ImgH of the effective pixel region on the imaging surface of the optical imaging lens and the effective semi - aperture DT11 of the object side of the first lens satisfy: 0.66 ≤ ImgH / DT11 ≤ 1.05; The radius of curvature R2 of the image side of the first lens and the effective focal length f of the optical imaging lens satisfy: 0.56 ≤ R2 / f ≤ 0.68; The radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side of the third lens satisfy: 0.67 ≤ R6 / R5 ≤ 0.

71.

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: - 0.82 ≤ f / f1 ≤ - 0.

59.

3. 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 f5 of the fifth lens satisfy: - 0.59 ≤ (f4 + f5) / f4 ≤ - 0.

19.

4. The optical imaging lens according to claim 1, wherein The distance BFL on the optical axis from the image side of the sixth lens to the imaging surface of the optical imaging lens and the combined focal length f34 of the third lens and the fourth lens satisfy: 0.56 ≤ BFL / f34 ≤ 0.

9.

5. The optical imaging lens according to claim 1, wherein, The central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0.52 ≤ CT3 / CT4 ≤ 1.

43.

6. The optical imaging lens according to claim 1, wherein The air gap T56 between the fifth lens and the sixth lens on the optical axis and the sum ∑AT of the air gaps between any two adjacent lenses among the first lens to the sixth lens on the optical axis satisfy: 0.09 ≤ T56 / ∑AT ≤ 0.

42.

7. The optical imaging lens according to claim 1, wherein The radius of curvature R7 of the object side of the fourth lens and the radius of curvature R8 of the image side of the fourth lens satisfy: 0.02 ≤ |(R7 + R8) / (R7 - R8)| ≤ 0.

3.

8. The optical imaging lens according to claim 1, wherein The axial distance SAG31 between the intersection point of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens and the axial distance SAG32 between the intersection point of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens satisfy: 0.18 ≤ SAG31 / SAG32 ≤ 1.

06.

9. The optical imaging lens according to claim 1, wherein The axial distance SAG51 between the intersection point of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens and the axial distance SAG61 between the intersection point of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens satisfy: 0.07 ≤ |(SAG51 + SAG61) / (SAG51 - SAG61)| ≤ 1.

51.

10. The optical imaging lens according to claim 1, characterized in that, The edge thickness ET6 of the sixth lens and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.54 ≤ ET6 / CT6 ≤ 0.

77.

11. The optical imaging lens according to claim 1, wherein, The edge thickness ET3 of the third lens and the edge thickness ET2 of the second lens satisfy: 0.13 ≤ ET3 / ET2 ≤ 4.

01.

12. The optical imaging lens according to claim 1, wherein The working wavelength band of the optical imaging lens is 450 nm - 1000 nm.

13. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens includes at least one glass aspherical lens.

Images