A four-piece optical imaging lens

Abstract

The present invention discloses a four-piece optical imaging lens, which sequentially includes, from the object side to the image side along the optical axis: a first lens group with positive optical power, including a first lens and a second lens, wherein the image side surface of the first lens is convex; a second lens group with positive optical power, including a third lens and a fourth lens, wherein the third lens has positive optical power and its object side surface is concave; wherein, the imaging brightness index Fno of the optical imaging system satisfies: Fno > 2.80. Controlling Fno above 2.8, on the one hand, is beneficial to obtaining a larger light input amount under the condition of the same focal length, improving the illuminance of the image plane and the response of the chip, thereby reducing the power consumption of the system; on the other hand, a smaller FNO will limit some performances of the optical system and greatly increase the optimization difficulty. Therefore, selecting an appropriate FNO is an important condition for combining whether the optimization difficulty and the optimized performance can meet the requirements.

Description

Technical Field

[0001] The present invention belongs to the field of optical imaging, and particularly relates to a four-piece optical imaging lens composed of a phase plate and four lenses. Background Art

[0002] As is well known, when an ideal optical system images an object in three-dimensional space, only the point objects on the conjugate object plane can form point images on one image plane, while for the point objects outside the object plane, the images formed on this image plane are a diffusion spot. If the diffusion spot is small enough and does not exceed the resolution of the receiving system, then the image composed of these diffusion spots can still be regarded as a clear image. The so-called depth of field of an optical system refers to the maximum distance that the object can move back and forth in the object space while ensuring a clear image on the image plane.

[0003] In recent years, with the continuous development of mobile phone lenses, especially for ultra-macro mobile phone lenses, their depth of field is small, and any external disturbance will affect their imaging effect. Therefore, we hope that the lens can obtain as large a depth of field as possible. The main reasons are as follows: First, a large depth of focus means a larger imaging space, so more object-side information can be obtained; second, a large depth of focus can correct the errors caused by defocusing for various reasons, including spherical aberration, chromatic aberration, field curvature, and defocusing caused by installation errors and temperature changes, reducing the losses caused during imaging; third, it can be displayed more stably, generating a more real and human-eye-friendly vision. Especially for macro-micro lenses, it is more stable, intuitive, and accurate when observing objects. Summary of the Invention

[0004] The present application aims to provide a four-piece optical imaging lens composed of a phase plate and four lenses, which has the characteristics of a large depth of field, a large depth of focus, and higher stability.

[0005] The present application provides a four-piece optical imaging lens, which sequentially includes, from the object side to the image side along the optical axis:

[0006] A first lens group with positive optical power, including a first lens and a second lens, wherein the image side surface of the first lens is a convex surface;

[0007] A second lens group with positive optical power, including a third lens and a fourth lens, wherein the third lens has positive optical power and its object side surface is a concave surface;

[0008] Wherein, the imaging brightness index Fno of the optical imaging system satisfies: Fno > 2.80.

[0009] According to an embodiment of the present application, the magnification M of the optical imaging lens satisfies: M < 1.2.

[0010] According to an embodiment of the present application, the combined focal length F1 of the first lens and the second lens and the combined focal length F2 of the third lens and the fourth lens satisfy: 0 < F1 / F2 < 2.

[0011] According to an embodiment of the present application, the central thickness CT1 of the first lens on the optical axis, 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: 0.75 ≤ CT3 / (CT1 / CT4) < 2.

[0012] According to an embodiment of the present application, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the combined focal length F2 of the third lens and the fourth lens satisfy: -3 < (f3 + f4) / F2 < 0.

[0013] According to an embodiment of the present application, the effective focal length f1 of the first lens and the radius of curvature R1 of the image side surface of the first lens satisfy: 0.3 < R1 / f1 < 1.

[0014] According to an embodiment of the present application, the central thickness CT3 of the third lens on the optical axis and the sum ∑CT of the central thicknesses of all lenses on the optical axis satisfy: 1.5 < ∑CT / CT3 < 3.

[0015] According to an embodiment of the present application, the on-axis distance TOL from the object to the object side surface of the first lens satisfies: 0 < TOL < 12.0 mm.

[0016] According to an embodiment of the present application, there are air gaps independently between each of the first lens to the fourth lens.

[0017] According to an embodiment of the present application, the optical imaging lens has at least one aspherical surface that is non-rotationally symmetric.

[0018] According to an embodiment of the present application, the edge thickness ET2 of the second lens and the central thickness CT2 of the second lens on the optical axis satisfy: 2.5 < ET2 / CT2 < 5.

[0019] According to an embodiment of the present application, the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 2 < ET3 / CT3 + ET4 / CT4 < 3.0.

[0020] According to an embodiment of the present application, the optical imaging lens has at least one phase plate.

[0021] According to an embodiment of the present application, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the maximum effective radius DT42 of the image side surface of the fourth lens satisfy: 2.26 ≤ TTL / DT42 < 4.

[0022] The present application also provides a four-piece optical imaging lens, which sequentially includes, from the object side to the image side along the optical axis:

[0023] A first lens group with positive optical power, including a first lens and a second lens, wherein the image side surface of the first lens is convex;

[0024] A second lens group with positive optical power, including a third lens and a fourth lens, wherein the third lens has positive optical power and its object side surface is concave;

[0025] Wherein, the combined focal length F1 of the first lens and the second lens and the combined focal length F2 of the third lens and the fourth lens satisfy: 0 < F1 / F2 < 2.

[0026] According to an embodiment of the present application, the magnification M of the optical imaging lens satisfies: M < 1.2.

[0027] According to an embodiment of the present application, the imaging brightness index Fno of the optical imaging system satisfies: Fno > 2.80.

[0028] According to an embodiment of the present application, the central thickness CT1 of the first lens on the optical axis, 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: 0.75 ≤ CT3 / (CT1 / CT4) < 2.

[0029] According to an embodiment of the present application, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the combined focal length F2 of the third lens and the fourth lens satisfy: -3 < (f3 + f4) / F2 < 0.

[0030] According to an embodiment of the present application, the effective focal length f1 of the first lens and the curvature radius R1 of the image side surface of the first lens satisfy: 0.3 < R1 / f1 < 1.

[0031] According to an embodiment of the present application, the central thickness CT3 of the third lens on the optical axis and the sum ∑CT of the central thicknesses of all lenses on the optical axis satisfy: 1.5 < ∑CT / CT3 < 3.

[0032] According to an embodiment of the present application, the on-axis distance TOL from the object to the object side surface of the first lens satisfies: 0 < TOL < 12.0 mm.

[0033] According to an embodiment of the present application, there are air gaps between the lenses of the first lens to the fourth lens, which are independent of each other.

[0034] According to an embodiment of the present application, the optical imaging lens has at least one aspherical surface that is non-rotationally symmetric.

[0035] According to an embodiment of the present application, the edge thickness ET2 of the second lens and the central thickness CT2 of the second lens on the optical axis satisfy: 2.5 < ET2 / CT2 < 5.

[0036] According to an embodiment of the present application, the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 2 < ET3 / CT3 + ET4 / CT4 < 3.0.

[0037] According to an embodiment of the present application, the optical imaging lens has at least one phase plate.

[0038] According to an embodiment of the present application, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the maximum effective radius DT42 of the image side surface of the fourth lens satisfy: 2.26 ≤ TTL / DT42 < 4.

[0039] Advantages of the present invention:

[0040] The four-piece optical imaging lens provided by the present invention includes multiple lenses, such as the first lens to the fourth lens. Controlling Fno above 2.8, on the one hand, is beneficial to obtaining a larger light input under the same focal length, improving the illuminance of the image surface and the response of the chip, thereby reducing the power consumption of the system; on the other hand, a smaller FNO will limit some performances of the optical system and greatly increase the optimization difficulty. Therefore, selecting an appropriate FNO is an important condition for combining whether the optimization difficulty and the optimization performance can meet the requirements. Description of the Drawings

[0041] 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, without creative efforts, other drawings can also be obtained based on these drawings.

[0042] Figure 1 It is a schematic diagram of the lens group structure of Embodiment 1 of the four-piece optical imaging lens of the present invention;

[0043] Figures 2a to 2d They are respectively the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 1 of the four-piece optical imaging lens of the present invention;

[0044] Figure 3 It is a schematic diagram of the lens group structure of Embodiment 2 of the four-piece optical imaging lens of the present invention;

[0045] Figures 4a to 4dThey are respectively the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 2 of the four-piece optical imaging lens of the present invention;

[0046] Figure 5 It is a schematic structural diagram of the lens group of Embodiment 3 of the four-piece optical imaging lens of the present invention;

[0047] Figures 6a to 6d They are respectively the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 3 of the four-piece optical imaging lens of the present invention;

[0048] Figure 7 It is a schematic structural diagram of the lens group of Embodiment 4 of the four-piece optical imaging lens of the present invention;

[0049] Figures 8a to 8d They are respectively the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 4 of the four-piece optical imaging lens of the present invention;

[0050] Figure 9 It is a schematic structural diagram of the lens group of Embodiment 5 of the four-piece optical imaging lens of the present invention;

[0051] Figures 10a to 10d They are respectively the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 5 of the four-piece optical imaging lens of the present invention;

[0052] Figure 11 It is a schematic structural diagram of the lens group of Embodiment 6 of the four-piece optical imaging lens of the present invention;

[0053] Figures 12a to 12d They are respectively the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 6 of the four-piece optical imaging lens of the present invention;

[0054] Figure 13 It is a schematic structural diagram of the lens group of Embodiment 7 of the four-piece optical imaging lens of the present invention;

[0055] Figures 14a to 14d They are respectively the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 7 of the four-piece optical imaging lens of the present invention;

[0056] Figure 15 It is a schematic structural diagram of the lens group of Embodiment 8 of the four-piece optical imaging lens of the present invention;

[0057] Figures 16a to 16d They are respectively the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 8 of the four-piece optical imaging lens of the present invention;

[0058] Figure 17Schematic diagram of the lens group of Embodiment 9 of the four-piece optical imaging lens of the present invention;

[0059] Figures 18a to 18d Axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 9 of the four-piece optical imaging lens of the present invention, respectively;

[0060] Figure 19 Schematic diagram of the lens group of Embodiment 10 of the four-piece optical imaging lens of the present invention;

[0061] Figures 20a to 20d Axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 10 of the four-piece optical imaging lens of the present invention, respectively;

[0062] Figure 21 Schematic diagram of the lens group of Embodiment 11 of the four-piece optical imaging lens of the present invention;

[0063] Figures 22a to 22d Axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 11 of the four-piece optical imaging lens of the present invention, respectively;

[0064] Figure 23 Schematic diagram of the lens group of Embodiment 12 of the four-piece optical imaging lens of the present invention;

[0065] Figures 24a to 24d Axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 12 of the four-piece optical imaging lens of the present invention, respectively. Detailed implementation manners

[0066] 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 of 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.

[0067] 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.

[0068] It should also be understood that the terms "comprise", "comprises", "has", "include" and / or "includes", when used in this specification, denote the presence of the stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. Further, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than individual elements in the list. Further, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to refer to an example or illustration.

[0069] In the drawings, for ease of illustration, the thickness, dimensions and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown 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.

[0070] 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 being 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.

[0071] 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 sense unless expressly so defined herein.

[0072] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention may 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 conjunction with the embodiments.

[0073] Exemplary Embodiments

[0074] The four-piece optical imaging lens according to an exemplary embodiment of the present invention includes four lenses, which sequentially include, from the object side to the image side along the optical axis: a first lens group with positive optical power, including a first lens and a second lens, wherein the image side surface of the first lens is convex; a second lens group with positive optical power, including a third lens and a fourth lens, wherein the third lens has positive optical power and its object side surface is concave; wherein, the imaging brightness index Fno of the optical imaging system satisfies: Fno>2.80. Controlling Fno above 2.8, on the one hand, is beneficial to obtaining a larger light input under the condition of the same focal length, improving the illuminance of the image plane and the response of the chip, thereby reducing the power consumption of the system; on the other hand, a smaller FNO will limit some performances of the optical system and greatly increase the optimization difficulty. Therefore, selecting an appropriate FNO is an important condition for combining whether the optimization difficulty and the optimized performance can meet the requirements. More specifically, the imaging brightness index Fno of the optical imaging system satisfies: Fno≥3.

[0075] In this exemplary embodiment, according to an embodiment of the present application, the magnification M of the four-piece optical imaging lens satisfies: M<1.2. Controlling the magnification of the optical system can control the object distance of the optical system, so as to realize the imaging of the lens at a finite distance. More specifically, the magnification M of the four-piece optical imaging lens satisfies: 0≤M≤0.99.

[0076] According to an embodiment of the present application, the combined focal length F1 of the first lens and the second lens and the combined focal length F2 of the third lens and the fourth lens satisfy: 0<F1 / F2<2. Reasonably configuring the ratio of the combined focal length of the first lens and the second lens to the combined focal length of the third lens and the fourth lens is beneficial to correcting the off-axis aberration of the lens group and improving the imaging quality of the lens. More specifically, the combined focal length F1 of the first lens and the second lens and the combined focal length F2 of the third lens and the fourth lens satisfy: 0.47≤F1 / F2≤1.66.

[0077] According to an embodiment of the present application, the central thickness CT1 of the first lens on the optical axis, 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: 0.75≤CT3 / (CT1 / CT4)<2. Reasonably configuring the ratio of the central thicknesses of the first lens, the third lens, and the fourth lens is beneficial to the processing of each lens on the one hand, and can reduce the thickness sensitivity of the lens and improve the yield on the other hand. More specifically, the central thickness CT1 of the first lens on the optical axis, 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: 0.75≤CT3 / (CT1 / CT4)≤1.1.

[0078] According to an embodiment of the present application, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the combined focal length F2 of the third lens and the fourth lens satisfy: -3 < (f3 + f4) / F2 < 0. Reasonably configuring the ratio of the effective focal lengths of the third lens and the fourth lens to their combined focal length can, on the one hand, help balance the optical power between the two lenses and correct the off-axis aberration generated by the lens group, thereby improving the imaging quality of the lens; on the other hand, it is beneficial to the processing and forming of each lens. More specifically, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the combined focal length F2 of the third lens and the fourth lens satisfy: -1.95 ≤ (f3 + f4) / F2 ≤ 0.05.

[0079] According to an embodiment of the present application, the effective focal length f1 of the first lens and the radius of curvature R1 of the image side of the first lens satisfy: 0.3 < R1 / f1 < 1. Reasonably matching the ratio of the effective focal length of the first lens to the radius of curvature can control the contribution of its field curvature within a reasonable range and reduce the optical sensitivity of each surface of the first lens. More specifically, the effective focal length f1 of the first lens and the radius of curvature R1 of the image side of the first lens satisfy: 0.58 ≤ R1 / f1 ≤ 0.79.

[0080] According to an embodiment of the present application, the central thickness CT3 of the third lens on the optical axis and the sum ∑CT of the central thicknesses of all lenses on the optical axis satisfy: 1.5 < ∑CT / CT3 < 3. Reasonably configuring the ratio of the sum of the central thicknesses of all lenses to the central thickness of the third lens can reasonably control the proportion of the central thickness of the third lens in the entire system, preventing the central thickness of the third lens from being too thick or too thin, which may affect the processing and forming of the third lens. On the other hand, it can also reduce the sensitivity of the central thickness of the third lens, thereby improving the yield. More specifically, the central thickness CT3 of the third lens on the optical axis and the sum ∑CT of the central thicknesses of all lenses on the optical axis satisfy: 0.75 ≤ ∑CT / CT3 ≤ 1.1.

[0081] According to an embodiment of the present application, the on-axis distance TOL from the object to the object side of the first lens satisfies: 0 < TOL < 12.0 mm. Reasonably controlling the object distance can meet the requirements of the lens for the magnification ratio. Moreover, the macro lens is very sensitive to the object distance. Reasonably controlling the object distance can also improve the imaging performance of the macro lens. More specifically, the on-axis distance TOL from the object to the object side of the first lens satisfies: 2.63 ≤ TOL ≤ 10.74 mm.

[0082] According to an embodiment of the present application, there are air gaps independent of each other between the first lens to the fourth lens. Reasonably controlling the respective air gaps between the first lens to the fourth lens can, firstly, provide a margin for the processing of the lens barrel; secondly, the sizes of the air gaps affect the performance of the system. Reasonably matching each gap is beneficial to improving the overall performance of the lens, thus meeting the requirements; thirdly, the sizes of the air gaps also affect the optical parameters of the entire lens, such as TTL. Therefore, reasonably matching the sizes of the gaps is a basic condition for meeting the optical parameters.

[0083] According to an embodiment of the present application, the four-piece optical imaging lens has at least one aspherical surface with non-rotational symmetry, which can be set at any position between the object and the imaging surface. The free-form surface is a surface type with non-rotational symmetry. Adding such a free-form surface in the design can, on the one hand, increase the degree of freedom in design, correct off-axis aberrations, and thus improve the imaging quality. On the other hand, adding a free-form surface in the optical system can increase the depth of focus of the system. A large depth of focus means a larger imaging space can be obtained, and thus more object-side information can be acquired. The depth of field and the depth of focus are essentially unified, so finally a larger depth of field can be obtained for the optical system through optical algorithms.

[0084] According to an embodiment of the present application, the edge thickness ET2 of the second lens and the central thickness CT2 of the second lens on the optical axis satisfy: 2.5 < ET2 / CT2 < 5. Reasonably distributing the edge thickness of the second lens and the central thickness on the optical axis makes the lens easy to be injection-molded, improves the processability of the imaging system, and at the same time ensures good imaging quality. More specifically, the edge thickness ET2 of the second lens and the central thickness CT2 of the second lens on the optical axis satisfy: 2.8 ≤ ET2 / CT2 ≤ 4.2.

[0085] According to an embodiment of the present application, the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 2 < ET3 / CT3 + ET4 / CT4 < 3.0. Reasonably configuring the sum of the ratio of the edge thickness to the central thickness of the third lens and the ratio of the edge thickness to the central thickness of the fourth lens can, on the one hand, reduce the thickness sensitivity of the lens at the first lens and the fourth lens, improve the yield rate of the lens, and on the other hand, correct the field curvature of the lens, facilitating the injection molding of each lens. More specifically, the edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 2.03 ≤ ET3 / CT3 + ET4 / CT4 ≤ 2.51.

[0086] According to an embodiment of the present application, the four-piece optical imaging lens has at least one phase plate, which can be set at any position between the object and the imaging surface. The phase plate (surface) is a method in an optical system to increase the depth of focus of the optical system by means of adding free-form surfaces, etc., and finally achieve a large depth of field. When an object passes through an optical system with a phase plate (surface), an intermediate blurred image is formed on the image surface, and the blurred degree of the images formed within the large depth of field range is ensured to be consistent. Then, by using the characteristic that the blurred degree of the intermediate images is consistent, various algorithms such as frequency domain or spatial domain are used to perform image restoration on them, so as to obtain the final clear image.

[0087] According to an embodiment of the present application, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the maximum effective radius DT42 of the image side surface of the fourth lens satisfy: 2.26 ≤ TTL / DT42 < 4. Reasonably controlling the ratio of the on-axis distance TTL of the optical system to the maximum effective radius of the image side surface of the fourth lens is beneficial to controlling the convergence of the marginal rays of the external field of view of the optical system and improving the imaging quality of the internal field of view of the optical system. More specifically, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the maximum effective radius DT42 of the image side surface of the fourth lens satisfy: 2.26 ≤ TTL / DT42 ≤ 2.78.

[0088] In this exemplary embodiment, the above four-piece 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 phase plate and the first lens. Optionally, the above four-piece 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 four-piece optical imaging lens according to the above embodiment of the present invention may adopt multiple lenses, such as the above four lenses. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the on-axis spacing between each lens, etc., the four-piece optical imaging lens has a relatively large imaging image surface, has the characteristics of a wide imaging range and high imaging quality, and ensures the ultra-thinness of the mobile phone.

[0090] In an exemplary embodiment, at least one of the lens surfaces of each lens is an aspherical surface, that is, at least one of the object side surface of the first lens to the image side surface of the fourth lens is an aspherical surface. The characteristic of an aspherical lens is that the curvature continuously changes 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, and the fourth lens is an aspherical surface. Optionally, both the object side surface and the image side surface of each of the first lens, the second lens, the third lens, and the fourth lens are aspherical surfaces.

[0091] 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 four-piece optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although four lenses are described as an example in the embodiment, the four-piece optical imaging lens is not limited to including four lenses. If necessary, the four-piece optical imaging lens may also include other numbers of lenses.

[0092] The following further describes specific embodiments of the four-piece optical imaging lens applicable to the above embodiments with reference to the accompanying drawings. Specific Embodiment 1

[0094] Figure 1 FIG. is a schematic structural diagram of a lens group of Embodiment 1 of the four-piece optical imaging lens of the present invention. The four-piece optical imaging lens sequentially includes, along the optical axis from the object side to the image side: a plane glass P, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an imaging surface S13.

[0095] The first lens E1 has a positive optical power. Its object side surface S3 is a convex surface, and its image side surface S4 is a convex surface. The second lens E2 has a negative optical power. Its object side surface S5 is a convex surface, and its image side surface S6 is a concave surface. The third lens E3 has a positive optical power. Its object side surface S7 is a concave surface, and its image side surface S8 is a convex surface. The fourth lens E4 has a negative optical power. Its object side surface S9 is a convex surface, and its image side surface S10 is a concave surface. The filter E5 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through each surface of surfaces S1 to S12 and finally forms an image on the imaging surface S13.

[0096] As shown in Table 1, it is a basic parameter table of the four-piece optical imaging lens of Embodiment 1, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0097]

[0098] Table 1

[0099] As shown in Table 2, in Embodiment 1, the total effective focal length f of the optical imaging lens is 1.23 mm, the distance TTL on the optical axis from the object side surface S1 of the planar glass P to the imaging surface S13 of the optical imaging lens is 3.57 mm, and half of the diagonal length of the effective pixel region on the imaging surface S13 is ImgH = 1.93 mm. Half of the maximum field of view angle of the optical imaging lens is Semi - FOV = 40.46°. The aperture value Fno of the optical imaging lens is 3.05.

[0100] The on - axis distance TOL from the object to the object side surface of the first lens is 3.07 mm.

[0101]

[0102] Table 2

[0103] The four - element optical imaging lens in Embodiment 1 satisfies:

[0104] TTL / DT42 = 2.33; where TTL is the on - axis distance from the object side surface of the first lens to the imaging surface, and DT42 is the maximum effective radius of the image side surface of the fourth lens.

[0105] R1 / f1 = 0.70; where f1 is the effective focal length of the first lens, and R1 is the curvature radius of the image side surface of the first lens.

[0106] M = 0.91; where M is the magnification of the four - element optical imaging lens.

[0107] F1 / F2 = 0.71; where F1 is the combined focal length of the first lens and the second lens, and F2 is the combined focal length of the third lens and the fourth lens.

[0108] (f3 + f4) / F2 = - 0.10; where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, and F2 is the combined focal length of the third lens and the fourth lens.

[0109] CT3 / (CT1 / CT4) = 0.87; where CT1 is the central thickness of the first lens on the optical axis, 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.

[0110] ET2 / CT2 = 2.80; where ET2 is the edge thickness of the second lens, and CT2 is the central thickness of the second lens on the optical axis.

[0111] ET3 / CT3 + ET4 / CT4 = 2.20; where ET3 is the edge thickness of the third lens, ET4 is the edge thickness of the fourth lens, CT1 is the central thickness of the first lens on the optical axis, and CT4 is the central thickness of the fourth lens on the optical axis.

[0112] ∑CT / CT3 = 2.56; where CT3 is the central thickness of the third lens on the optical axis, and ∑CT is the sum of the central thicknesses of all lenses on the optical axis.

[0113] In this embodiment, the object side and the image side of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0114]

[0115] where x is the sagitta, the distance from the vertex of the aspherical surface to the aspherical surface along the optical axis at a position with a height of h; 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); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface.

[0116] In Example 1, the object side and the image side of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 3 shows the higher-order coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 for each aspherical mirror surface S3 - S10 in Example 1.

[0117] Face number A4 A6 A8 A10 A12 A14 A16 S3 3.0243E-04 -3.9372E-04 -6.7615E-05 -9.8896E-06 -5.3726E-06 1.1935E-06 -1.5985E-06 S4 -2.3956E-02 -8.0399E-04 -1.9733E-04 8.2158E-08 -1.0167E-05 7.3966E-07 -6.4651E-07 S5 -4.5402E-02 -1.4159E-03 -1.6201E-04 1.1492E-05 -1.3287E-05 2.7177E-06 -2.0596E-06 S6 -6.4313E-02 2.1965E-03 8.0646E-04 -8.3623E-05 -9.5875E-05 -1.5904E-05 2.6295E-05 S7 -4.8753E-03 3.3615E-03 2.2969E-03 -4.5831E-04 -3.1683E-04 -7.2477E-05 8.1927E-05 S8 -1.4514E-01 7.0286E-02 -6.3528E-03 9.1917E-03 -4.8817E-03 1.4352E-03 -1.2835E-03 S9 -4.1148E-01 8.7586E-02 -2.0727E-02 9.8237E-03 -6.5862E-03 3.3784E-03 -1.6941E-03 S10 -7.9536E-01 1.1758E-01 -4.3589E-02 1.4753E-02 -8.3717E-03 3.6954E-03 -1.6420E-03 Face number A18 A20 A22 A24 A26 A28 A30 S3 7.7383E-07 -1.2301E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 5.2802E-07 -9.1554E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 -1.5570E-07 -1.2751E-06 1.2619E-06 -2.5434E-07 0.0000E+00 0.0000E+00 0.0000E+00 S6 -2.2204E-06 1.9087E-06 -4.0866E-07 -3.7584E-07 0.0000E+00 0.0000E+00 0.0000E+00 S7 1.1288E-05 -8.4021E-06 -1.7599E-06 -3.9662E-07 1.9497E-06 -1.8135E-06 3.4959E-07 S8 6.5114E-04 -2.5988E-04 1.5879E-04 -8.8848E-05 1.1442E-05 -1.2252E-05 9.8356E-06 S9 1.1482E-03 -7.4155E-04 4.0260E-04 -2.6196E-04 1.2882E-04 -8.3321E-05 3.4331E-05 S10 8.4371E-04 -6.0314E-04 1.6518E-05 -3.5227E-04 6.6030E-05 1.2419E-04 1.6561E-04

[0118] Table 3

[0119] Figure 2a shows the axial chromatic aberration curve of the optical imaging lens of Example 1, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 2b shows the astigmatism curve of the optical imaging lens of Example 1, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2c shows the distortion curve of the optical imaging lens of Example 1, which represents the distortion magnitude values corresponding to different image heights. Figure 2dThe longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 2a to 2d As can be seen, the optical imaging lens given in Embodiment 1 can achieve good imaging quality. Specific Embodiment 2

[0121] Figure 3 FIG. is a schematic structural diagram of the lens group of the four-piece optical imaging lens of Embodiment 2 of the present invention. The four-piece optical imaging lens sequentially includes, along the optical axis from the object side to the image side: a planar glass P, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an imaging plane S13.

[0122] The first lens E1 has a positive optical power. Its object side surface S3 is convex, and its image side surface S4 is convex. The second lens E2 has a negative optical power. Its object side surface S5 is convex, and its image side surface S6 is concave. The third lens E3 has a positive optical power. Its object side surface S7 is concave, and its image side surface S8 is convex. The fourth lens E4 has a negative optical power. Its object side surface S9 is convex, and its image side surface S10 is concave. The filter E5 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the surfaces of S1 to S12 and finally forms an image on the imaging plane S13.

[0123] As shown in Table 4, it is the basic parameter table of the four-piece optical imaging lens of Embodiment 2, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0124]

[0125]

[0126] Table 4

[0127] As shown in Table 5, in Embodiment 2, the total effective focal length f of the optical imaging lens is 1.14 mm, the distance TTL on the optical axis from the object side surface S1 of the planar glass P to the imaging plane S13 of the optical imaging lens is 3.38 mm, and half of the diagonal length of the effective pixel area on the imaging plane S13 is ImgH = 1.93 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 42.50°. The aperture value Fno of the optical imaging lens is 3.05.

[0128] The on-axis distance TOL from the object to the object side surface of the first lens is 4.16 mm.

[0129]

[0130] Table 5

[0131] In Embodiment 2, the object side and the image side of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 6 shows the high-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0132]

[0133]

[0134] Table 6

[0135] Figure 4a shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 2, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 4b shows the astigmatism curve of the optical imaging lens of Embodiment 2, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 4c shows the distortion curve of the optical imaging lens of Embodiment 2, which represents the distortion magnitude values corresponding to different image heights. Figure 4d shows the lateral chromatic aberration curve of the optical imaging lens of Embodiment 2, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 4a to 4d shown, the optical imaging lens given in Embodiment 2 can achieve good imaging quality. Specific Embodiment 3

[0137] Figure 5 This is a schematic structural diagram of the lens group of the four-piece optical imaging lens according to Embodiment 3 of the present invention. The four-piece optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a plane glass P, a diaphragm STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an imaging surface S13.

[0138] The first lens E1 has a positive optical power, its object side S4 is convex, and its image side S5 is convex. The second lens E2 has a negative optical power, its object side S6 is convex, and its image side S7 is concave. The third lens E3 has a positive optical power, its object side S8 is convex, and its image side S9 is convex. The fourth lens E4 has a negative optical power, its object side S10 is convex, and its image side S11 is concave. The filter E5 has an object side S12 and an image side S13. The light from the object sequentially passes through the surfaces of S1 to S13 and finally forms an image on the imaging surface S14.

[0139] As shown in Table 7, it is the basic parameter table of the four-piece optical imaging lens of Embodiment 3, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0140]

[0141]

[0142] Table 7

[0143] As shown in Table 8, in Embodiment 3, the total effective focal length f of the optical imaging lens is 1.15 mm, the distance TTL on the optical axis from the object side S1 of the planar glass P to the imaging surface S13 of the optical imaging lens is 3.53 mm, and half of the diagonal length of the effective pixel region on the imaging surface S13 is ImgH = 1.93 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 42.54°. The aperture value Fno of the optical imaging lens is 3.05.

[0144] The on-axis distance TOL from the object to the object side of the first lens is 6.69 mm.

[0145]

[0146] Table 8

[0147] In Embodiment 3, the object side and the image side of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 9 shows the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 that can be used for the aspherical surfaces S4 - S11 in Embodiment 3.

[0148]

[0149]

[0150] Table 9

[0151] Figure 6a Figure 8 shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 3, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 6b Figure 9 shows the astigmatism curve of the optical imaging lens of Embodiment 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6c Figure 10 shows the distortion curve of the optical imaging lens of Embodiment 3, which represents the distortion magnitude values corresponding to different image heights. Figure 6d Figure 11 shows the longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 3, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 6a to 6d As can be seen from Figure 12, the optical imaging lens given in Embodiment 3 can achieve good imaging quality. Specific Embodiment 4

[0153] Figure 7 FIG. 13 is a schematic structural diagram of the lens group of the four-piece optical imaging lens according to Embodiment 4 of the present invention. The four-piece optical imaging lens sequentially includes, along the optical axis from the object side to the image side: a planar glass P, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an imaging surface S13.

[0154] The first lens E1 has a positive optical power. Its object side surface S4 is convex, and its image side surface S5 is convex. The second lens E2 has a negative optical power. Its object side surface S6 is convex, and its image side surface S7 is concave. The third lens E3 has a positive optical power. Its object side surface S8 is convex, and its image side surface S9 is convex. The fourth lens E4 has a negative optical power. Its object side surface S10 is convex, and its image side surface S11 is concave. The filter E5 has an object side surface S12 and an image side surface S13. Light from the object sequentially passes through the surfaces of S1 to S13 and finally forms an image on the imaging surface S14.

[0155] As shown in Table 10, it is the basic parameter table of the four-piece optical imaging lens of Embodiment 4, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0156]

[0157] Table 10

[0158] As shown in Table 11, in Example 4, the total effective focal length f of the optical imaging lens is 1.13 mm, the distance TTL on the optical axis from the object side surface S1 of the planar glass P to the imaging surface S13 of the optical imaging lens is 3.55 mm, and half of the diagonal length of the effective pixel area on the imaging surface S13 is ImgH = 1.93 mm. Half of the maximum field of view angle of the optical imaging lens is Semi - FOV = 42.31°. The aperture value Fno of the optical imaging lens is 3.01.

[0159] The on - axis distance TOL from the object to the object side surface of the first lens is 10.06 mm.

[0160]

[0161] Table 11

[0162] In Example 4, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 12 shows the higher - order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 for each aspherical mirror surface S4 - S11 in Example 4.

[0163] Face number A4 A6 A8 A10 A12 A14 A16 S4 -1.8627E-03 -3.1620E-04 -2.5659E-05 -1.5354E-05 -9.5185E-06 -1.8172E-06 -4.2932E-07 S5 -4.2189E-02 4.9905E-03 -4.3087E-04 6.1657E-05 -2.9821E-05 6.7176E-07 3.6062E-06 S6 -1.0921E-01 1.1260E-02 -3.7880E-06 -7.8008E-05 -5.1583E-05 -1.1039E-06 9.5331E-07 S7 -1.4316E-01 1.0491E-02 9.9277E-04 9.6323E-05 -8.4942E-05 -5.3734E-05 -6.0350E-06 S8 -3.2585E-02 3.1708E-03 4.3175E-03 6.5184E-04 -5.4013E-04 -7.6706E-05 -4.7759E-05 S9 -8.1562E-02 4.1017E-02 -3.6708E-03 6.8496E-03 -5.6527E-04 7.5062E-04 -2.1857E-04 S10 -7.0735E-01 1.2504E-01 -2.5018E-02 9.5510E-03 -4.2248E-03 1.3098E-03 -7.1530E-05 S11 -3.3225E+00 6.8854E-01 -2.2568E-01 8.5856E-02 -3.9414E-02 1.8974E-02 -8.9548E-03 Face number A18 A20 A22 A24 A26 A28 A30 S4 1.5644E-07 -1.9187E-09 1.5688E-06 1.5745E-06 0.0000E+00 0.0000E+00 0.0000E+00 S5 6.1313E-07 1.0400E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 1.4150E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 3.5897E-06 1.0425E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 6.1492E-05 -1.4461E-05 1.1123E-05 -1.2212E-05 5.0909E-06 -3.5265E-06 2.1851E-06 S9 9.7924E-05 -3.4336E-05 9.6356E-06 -1.1527E-05 0.0000E+00 0.0000E+00 0.0000E+00 S10 8.1482E-05 -1.3074E-04 -1.3143E-04 -2.2875E-05 -3.4540E-05 7.7170E-06 2.0445E-05 S11 4.6164E-03 -2.6672E-03 1.1141E-03 -8.6246E-04 3.3727E-04 -1.4961E-04 1.4978E-04

[0164] Table 12

[0165] Figure 8a shows the axial chromatic aberration curve of the optical imaging lens in Example 4, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 8b shows the astigmatism curve of the optical imaging lens in Example 4, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8c shows the distortion curve of the optical imaging lens in Example 4, which represents the distortion magnitude values corresponding to different image heights. Figure 8d shows the lateral chromatic aberration curve of the optical imaging lens in Example 4, which represents the deviation of different image heights on the imaging surface after light rays pass through the lens. According to Figures 8a to 8d shown, the optical imaging lens given in Example 4 can achieve good imaging quality. Specific Example 5

[0167] Figure 9Schematic diagram of the lens group structure of Embodiment 5 of the four-piece optical imaging lens of the present invention. The four-piece optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a planar glass P, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an imaging surface S13.

[0168] The first lens E1 has a positive optical power. Its object surface S4 is convex, and its image surface S5 is convex. The second lens E2 has a negative optical power. Its object surface S6 is convex, and its image surface S7 is concave. The third lens E3 has a positive optical power. Its object surface S8 is convex, and its image surface S9 is convex. The fourth lens E4 has a negative optical power. Its object surface S10 is convex, and its image surface S11 is concave. The filter E5 has an object surface S12 and an image surface S13. Light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on the imaging surface S14.

[0169] As shown in Table 13, it is the basic parameter table of the four-piece optical imaging lens of Embodiment 5. Among them, the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0170]

[0171] Table 13

[0172] As shown in Table 14, in Embodiment 5, the total effective focal length f of the optical imaging lens is 1.13 mm, the distance TTL on the optical axis from the object surface S1 of the planar glass P to the imaging surface S13 of the optical imaging lens is 3.53 mm, and half of the diagonal length of the effective pixel region on the imaging surface S13 is ImgH = 1.93 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 42.64°. The aperture value Fno of the optical imaging lens is 3.02.

[0173] The axial distance TOL from the object to the object surface of the first lens is 10.74 mm.

[0174]

[0175]

[0176] Table 14

[0177] In Embodiment 5, the object surface and the image surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 15 shows the high-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0178] Face number A4 A6 A8 A10 A12 A14 A16 S4 -2.1936E-03 -4.3508E-04 -2.4455E-05 -1.2737E-05 -9.4974E-06 -6.2145E-06 -4.2490E-07 S5 2.6267E-02 8.4228E-03 2.8145E-03 4.7191E-04 -5.9792E-04 1.2940E-03 -1.2468E-03 S6 -1.7484E-01 1.6058E-02 2.5313E-04 -1.1534E-04 -7.0086E-05 -4.6530E-05 8.7885E-06 S7 -2.0819E-01 9.2407E-03 2.0954E-03 -3.0816E-04 -4.6685E-05 -2.2642E-04 2.9850E-05 S8 -3.0324E-02 2.6326E-02 -9.2702E-03 -3.9749E-03 2.6434E-03 -1.4256E-04 -5.7072E-04 S9 -1.4515E-01 7.9106E-02 3.9828E-03 1.2861E-02 8.3323E-04 1.1377E-03 -4.5629E-04 S10 -6.3459E-01 9.8207E-02 -8.3980E-03 8.5275E-03 -1.7574E-03 -6.5368E-04 2.1231E-04 S11 -3.4255E+00 6.6549E-01 -2.0402E-01 8.2644E-02 -3.8588E-02 1.5770E-02 -8.5734E-03 Face number A18 A20 A22 A24 A26 A28 A30 S4 4.4172E-07 2.2355E-06 2.8671E-06 2.6024E-06 0.0000E+00 0.0000E+00 0.0000E+00 S5 1.0450E-03 -7.8140E-04 5.2879E-04 -3.2373E-04 1.6676E-04 -7.0134E-05 1.2595E-05 S6 3.7561E-06 3.3329E-06 -1.3864E-06 -1.0989E-06 3.4287E-07 0.0000E+00 0.0000E+00 S7 1.2801E-06 1.4615E-05 -6.6524E-07 1.4965E-06 -1.6078E-06 0.0000E+00 0.0000E+00 S8 2.1087E-04 3.5411E-05 -5.7539E-05 6.0089E-06 4.0183E-06 2.3315E-06 1.4103E-06 S9 -1.7671E-04 -2.8262E-04 -1.5182E-04 -9.7553E-05 -4.5874E-05 -1.4575E-05 -1.8718E-06 S10 -6.6339E-05 5.6006E-05 -7.2640E-05 2.5310E-05 -1.3753E-05 1.4976E-05 -5.6169E-06 S11 3.6951E-03 -1.8794E-03 1.3702E-03 -1.1922E-04 6.6043E-04 2.0524E-04 2.6174E-04

[0179] Table 15

[0180] Figure 10a shows the axial chromatic aberration curve of the optical imaging lens of Example 5, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 10b shows the astigmatism curve of the optical imaging lens of Example 5, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 10c shows the distortion curve of the optical imaging lens of Example 5, which represents the distortion magnitude values corresponding to different image heights. Figure 10d shows the longitudinal chromatic aberration curve of the optical imaging lens of Example 5, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 10a to 10d as shown, the optical imaging lens given in Example 5 can achieve good imaging quality. Specific Example 6

[0182] Figure 11 is a schematic structural diagram of the lens group of the four-piece optical imaging lens of Example 6 of the present invention. The four-piece optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a plane glass P, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an imaging surface S13.

[0183] The first lens E1 has a positive optical power. Its object side surface S4 is convex, and its image side surface S5 is convex. The second lens E2 has a negative optical power. Its object side surface S6 is convex, and its image side surface S7 is concave. The third lens E3 has a positive optical power. Its object side surface S8 is convex, and its image side surface S9 is convex. The fourth lens E4 has a negative optical power. Its object side surface S10 is convex, and its image side surface S11 is concave. The filter E5 has an object side surface S12 and an image side surface S13. Light from the object sequentially passes through the surfaces of S1 to S13 and finally forms an image on the imaging surface S14.

[0184] As shown in Table 16, it is the basic parameter table of the four-piece optical imaging lens of Example 6, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0185]

[0186] Table 16

[0187] In Embodiment 6, the phase plate is an aspherical surface with non-rotational symmetry. The surface profile x of each aspherical lens with non-rotational symmetry can be defined by, but not limited to, the following aspherical formula:

[0188] z = 0.03x 3 + 0.03y 3 ;

[0189] where z is the sagittal height of the surface parallel to the z-axis direction; the SCO coefficients corresponding to the xy terms are from C2 to C66. The list of ASS surface coefficients in Embodiment 6 is shown in Table 17. In the list of AAS surface coefficients in Embodiment 6, the numerical values of the non-zero coefficients among the high-order XY coefficients C2 - C66 of each aspherical surface with non-rotational symmetry are given, and the SCO coefficients not given are all 0.

[0190] AAS face C7 C10 S3 3.0000E-02 3.0000E-02

[0191] Table 17

[0192] As shown in Table 18, in Embodiment 6, the total effective focal length f of the optical imaging lens is 1.13 mm, the distance TTL from the object side surface S1 of the planar glass P to the imaging surface S13 of the optical imaging lens on the optical axis is 3.53 mm, and half of the diagonal length of the effective pixel area on the imaging surface S13 is ImgH = 1.93 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 42.70°. The aperture value of the optical imaging lens is Fno = 3.05.

[0193] The on-axis distance TOL from the object to the object side surface of the first lens is 2.63 mm.

[0194]

[0195] Table 18

[0196] In Embodiment 6, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 19 shows the high-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 that can be used for each aspherical mirror surface S4 - S11 in Embodiment 6.

[0197] Face number A4 A6 A8 A10 A12 A14 A16 S4 -1.1830E-03 -2.0772E-04 -1.7113E-05 2.9589E-06 -8.6557E-07 1.8165E-08 -4.6120E-07 S5 -5.6283E-02 6.0838E-03 -8.1758E-04 1.7651E-04 -2.4742E-05 -5.8567E-06 -5.0178E-07 S6 -1.7643E-01 1.5507E-02 4.4181E-04 -2.7656E-05 -3.4645E-05 -5.9556E-05 -1.8686E-06 S7 -1.2378E-01 2.2066E-03 8.6907E-04 -2.0938E-04 1.3517E-04 -3.2812E-05 3.8941E-06 S8 1.0070E-02 -2.5429E-03 4.8199E-03 -3.2075E-06 -2.5541E-04 -1.1579E-04 -1.6953E-06 S9 -1.4190E-01 8.0495E-02 3.6084E-05 1.1672E-02 4.4084E-04 1.5435E-03 -1.9191E-04 S10 -6.1378E-01 9.5491E-02 -1.4066E-02 8.2286E-03 -8.5945E-04 2.3996E-04 5.1161E-06 S11 -3.3508E+00 6.6441E-01 -2.2011E-01 8.5525E-02 -3.7531E-02 1.7283E-02 -9.2186E-03 Face number A18 A20 A22 A24 A26 A28 A30 S4 -1.0203E-07 9.1797E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 -2.5718E-06 6.3443E-07 -9.5748E-07 1.1698E-06 -2.2971E-07 0.0000E+00 0.0000E+00 S6 1.0260E-05 7.9298E-06 3.6058E-06 3.0632E-08 -4.7183E-07 0.0000E+00 0.0000E+00 S7 -1.6642E-06 1.4423E-06 -7.7539E-07 1.3037E-07 0.0000E+00 0.0000E+00 0.0000E+00 S8 2.2747E-05 4.0133E-06 -1.7914E-06 -6.8386E-07 1.1138E-06 -8.7964E-07 1.8389E-07 S9 -4.0771E-05 -2.3424E-04 -1.6178E-04 -1.1309E-04 -7.1572E-05 -2.3754E-05 -8.2619E-06 S10 -2.8354E-04 4.4032E-05 -1.1437E-04 1.3386E-05 -4.8426E-05 3.4630E-05 -5.7835E-06 S11 4.0367E-03 -2.6601E-03 9.4022E-04 -7.3025E-04 3.5893E-04 -9.0645E-05 2.1119E-04

[0198] Table 19

[0199] Figure 12a Shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 6, which represents the deviation of the focusing points of light rays of different wavelengths after passing through the lens. Figure 12b Shows the astigmatism curve of the optical imaging lens of Embodiment 6, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12c Shows the distortion curve of the optical imaging lens of Embodiment 6, which represents the distortion magnitude values corresponding to different image heights. Figure 12d Shows the lateral chromatic aberration curve of the optical imaging lens of Embodiment 6, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 12a to 12d As can be seen from the figure, the optical imaging lens given in Embodiment 6 can achieve good imaging quality. Specific Embodiment 7

[0201] Figure 13 Schematic diagram of the lens group structure of the four-piece optical imaging lens of Embodiment 7 of the present invention. The four-piece optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a planar glass P, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an imaging surface S13.

[0202] The first lens E1 has a positive optical power. Its object side surface S4 is convex, and its image side surface S5 is convex. The second lens E2 has a negative optical power. Its object side surface S6 is convex, and its image side surface S7 is concave. The third lens E3 has a positive optical power. Its object side surface S8 is convex, and its image side surface S9 is convex. The fourth lens E4 has a negative optical power. Its object side surface S10 is convex, and its image side surface S11 is concave. The filter E5 has an object side surface S12 and an image side surface S13. Light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on the imaging surface S14.

[0203] As shown in Table 20, it is the basic parameter table of the four-piece optical imaging lens of Embodiment 7. Among them, the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0204]

[0205] Table 20

[0206] In Embodiment 7, the phase plate is an aspherical surface of non-rotational symmetry. The surface shape x of each aspherical lens of non-rotational symmetry can be defined by, but not limited to, the following aspherical formula:

[0207] z = 0.03x 3 + 0.03y 3 ;

[0208] Among them, z is the sag of the surface parallel to the z-axis direction; the SCO coefficients corresponding to the xy terms are C2 to C66. The ASS surface coefficient list of Example 7 is shown in Table 21. In the AAS surface coefficient list of Example 7, the numerical values of the non-zero coefficients among the high-order XY coefficients C2-C66 of each non-rotationally symmetric aspherical surface are given, and the SCO coefficients not given are all 0.

[0209] AAS face C7 C10 S3 3.0000E-02 3.0000E-02

[0210] Table 21

[0211] As shown in Table 22, in Example 7, the total effective focal length f of the optical imaging lens is 1.14 mm, the distance TTL from the object side surface S1 of the planar glass P to the imaging surface S13 of the optical imaging lens on the optical axis is 3.52 mm, and half of the diagonal length of the effective pixel region on the imaging surface S13 is ImgH = 1.93 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 42.62°. The aperture value Fno of the optical imaging lens is 3.00.

[0212] The on-axis distance TOL from the object to the object side surface of the first lens is 7.66 mm.

[0213]

[0214] Table 22

[0215] In Example 7, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 23 shows the high-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 that can be used for each aspherical mirror surface S4-S11 in Example 7.

[0216] Face number A4 A6 A8 A10 A12 A14 A16 S4 -2.5666E-03 -2.9289E-04 -7.1294E-05 -5.1308E-05 -2.2776E-05 -6.9333E-06 -2.5342E-06 S5 -4.6950E-02 6.5907E-03 -7.0600E-04 1.1816E-04 -3.0214E-05 -7.0851E-06 3.0812E-06 S6 -1.8189E-01 2.7526E-02 -2.9288E-03 -7.8163E-04 -2.5856E-04 3.6481E-05 5.0176E-05 S7 -2.0893E-01 1.4189E-02 -1.6737E-04 -4.2219E-04 -2.2255E-04 -1.1976E-04 -1.5477E-05 S8 1.4432E-03 3.3951E-03 4.6236E-03 -2.4200E-04 -4.7375E-04 -3.5306E-05 7.4115E-07 S9 -1.3576E-01 8.0759E-02 6.0299E-03 1.4392E-02 1.5931E-03 1.6473E-03 -5.8218E-04 S10 -6.4260E-01 1.0513E-01 -1.6253E-02 1.0269E-02 -1.8360E-03 7.6569E-04 -1.2824E-04 S11 -3.4287E+00 6.9375E-01 -2.2931E-01 9.0747E-02 -3.9974E-02 1.9129E-02 -1.0164E-02 Face number A18 A20 A22 A24 A26 A28 A30 S4 -1.9280E-06 -4.6761E-07 6.5994E-07 9.0352E-07 0.0000E+00 0.0000E+00 0.0000E+00 S5 -4.6499E-06 4.2804E-06 -1.6496E-06 2.0550E-06 -2.0997E-06 7.8613E-07 -9.5473E-08 S6 5.6550E-05 3.1324E-05 2.1665E-05 9.2725E-06 3.6373E-06 0.0000E+00 0.0000E+00 S7 1.7030E-05 -1.5689E-06 7.0789E-06 -2.3113E-06 5.9809E-07 0.0000E+00 0.0000E+00 S8 4.2482E-05 -8.3513E-06 2.0103E-06 -4.5758E-06 7.9611E-07 -1.5988E-06 1.4337E-06 S9 -5.6516E-04 -7.2511E-04 -5.1189E-04 -3.2480E-04 -1.7256E-04 -5.9201E-05 -1.6061E-05 S10 -2.3561E-04 3.8651E-06 -1.2678E-04 5.9680E-06 -4.5452E-05 5.3478E-05 -4.7603E-06 S11 4.5763E-03 -3.1127E-03 1.0513E-03 -8.8884E-04 4.6992E-04 -9.0643E-05 2.7946E-04

[0217] Table 23

[0218] Figure 14a shows the axial chromatic aberration curve of the optical imaging lens of Example 7, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 14b shows the astigmatism curve of the optical imaging lens of Example 7, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 14cThe distortion curve of the optical imaging lens of Embodiment 7 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 14d The longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 7 is shown, which represents the deviation of different image heights on the imaging surface after light passes through the lens. According to Figures 14a to 14d what is shown, the optical imaging lens given in Embodiment 7 can achieve good imaging quality. Specific Embodiment 8

[0220] Figure 15 This is a schematic structural diagram of the lens group of the four-piece optical imaging lens of Embodiment 8 of the present invention. The four-piece optical imaging lens sequentially includes, along the optical axis from the object side to the image side: a planar glass P, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an imaging surface S13.

[0221] The first lens E1 has a positive optical power. Its object side surface S4 is a convex surface, and its image side surface S5 is a convex surface. The second lens E2 has a negative optical power. Its object side surface S6 is a convex surface, and its image side surface S7 is a concave surface. The third lens E3 has a positive optical power. Its object side surface S8 is a convex surface, and its image side surface S9 is a convex surface. The fourth lens E4 has a negative optical power. Its object side surface S10 is a convex surface, and its image side surface S11 is a concave surface. The filter E5 has an object side surface S12 and an image side surface S13. Light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on the imaging surface S14.

[0222] As shown in Table 24, it is the basic parameter table of the four-piece optical imaging lens of Embodiment 8. Among them, the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0223]

[0224] Table 24

[0225] In Embodiment 8, the phase plate is an aspherical surface with non-rotational symmetry. The surface shape x of each aspherical lens with non-rotational symmetry can be defined by, but not limited to, the following aspherical formula:

[0226] z = 0.03x 3 + 0.03y 3 ;

[0227] where z is the sagitta of the surface parallel to the z-axis direction; the SCO coefficients corresponding to the xy terms are C2 to C66. The list of ASS surface coefficients in Embodiment 8 is shown in Table 25. In the list of AAS surface coefficients in Embodiment 8, the numerical values of the non-zero coefficients among the high-order XY coefficients C2 - C66 of each non-rotational symmetric aspherical surface are given, and the SCO coefficients not given are all 0.

[0228] AAS face C7 C10 S3 3.0000E-02 3.0000E-02

[0229] Table 25

[0230] As shown in Table 26, in Embodiment 8, the total effective focal length f of the optical imaging lens is 1.14 mm, the distance TTL on the optical axis from the object side S1 of the planar glass P to the imaging surface S13 of the optical imaging lens is 3.52 mm, and half of the diagonal length of the effective pixel region on the imaging surface S13 is ImgH = 1.93 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 42.62°. The aperture value Fno of the optical imaging lens is 3.00.

[0231] The on-axis distance TOL from the object to the object side of the first lens is 2.63 mm.

[0232]

[0233] Table 26

[0234] In Embodiment 8, the object side and the image side of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 27 shows the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 that can be used for each aspherical mirror surface S4 - S11 in Embodiment 8.

[0235] Face number A4 A6 A8 A10 A12 A14 A16 S4 -2.6496E-03 -3.9776E-04 -3.2635E-05 -3.2019E-05 -9.9818E-06 -5.2267E-06 -5.5203E-07 S5 -6.7873E-02 1.1418E-02 -1.9373E-03 1.2045E-04 -1.3941E-04 -2.8991E-05 4.2860E-06 S6 -1.7276E-01 2.1261E-02 -1.3365E-03 -2.5809E-04 -6.5058E-05 -4.1418E-05 1.0805E-06 S7 -2.0862E-01 1.2814E-02 5.9376E-04 -6.6017E-04 -8.5035E-05 -2.0504E-04 2.2954E-05 S8 4.7060E-03 -4.0558E-04 4.9070E-03 -2.0197E-04 -3.1617E-04 -1.1104E-04 1.4336E-05 S9 -1.3446E-01 8.0672E-02 5.6952E-03 1.3105E-02 1.1560E-03 1.3221E-03 -3.4626E-04 S10 -6.4483E-01 1.0116E-01 -1.3321E-02 9.1677E-03 -1.7546E-03 2.5762E-04 -1.1462E-04 S11 -3.2109E+00 6.3161E-01 -2.0404E-01 7.9117E-02 -3.4304E-02 1.5978E-02 -8.1201E-03 Face number A18 A20 A22 A24 A26 A28 A30 S4 -2.4059E-06 -5.0767E-07 8.2717E-08 1.2056E-06 0.0000E+00 0.0000E+00 0.0000E+00 S5 -5.8425E-06 3.7411E-06 -3.5894E-06 3.2648E-06 -6.6197E-09 1.3282E-06 -6.5643E-07 S6 1.1707E-06 3.7065E-07 -2.7460E-07 -1.6195E-06 9.5895E-07 0.0000E+00 0.0000E+00 S7 4.9467E-06 5.6154E-06 3.4956E-06 -1.4950E-06 -1.9196E-08 0.0000E+00 0.0000E+00 S8 2.7737E-05 1.8605E-06 -1.2315E-06 -1.8391E-06 1.7021E-07 -5.0981E-07 3.5315E-07 S9 -2.1245E-04 -3.0067E-04 -1.7484E-04 -9.0281E-05 -4.3461E-05 -7.0447E-06 -1.2768E-06 S10 -2.7833E-04 -4.2037E-05 -8.1309E-05 2.7781E-05 -2.7548E-05 2.4163E-05 -8.6989E-06 S11 3.5453E-03 -2.1895E-03 8.4048E-04 -6.2686E-04 2.3020E-04 -9.6385E-05 1.4917E-04

[0236] Table 27

[0237] Figure 16a shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 8, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 16b shows the astigmatism curve of the optical imaging lens of Embodiment 8, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 16c shows the distortion curve of the optical imaging lens of Embodiment 8, which represents the distortion magnitude values corresponding to different image heights. Figure 16d shows the lateral chromatic aberration curve of the optical imaging lens of Embodiment 8, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 16a to 16d as shown, it can be seen that the optical imaging lens given in Embodiment 8 can achieve good imaging quality. Specific Embodiment 9

[0239] Figure 17 This is a schematic diagram of the lens group structure of Embodiment 9 of the four-piece optical imaging lens of the present invention. The four-piece optical imaging lens sequentially includes, along the optical axis from the object side to the image side: a planar glass P, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an imaging surface S13.

[0240] The first lens E1 has a positive optical power. Its object side surface S4 is convex, and its image side surface S5 is convex. The second lens E2 has a negative optical power. Its object side surface S6 is convex, and its image side surface S7 is concave. The third lens E3 has a positive optical power. Its object side surface S8 is convex, and its image side surface S9 is convex. The fourth lens E4 has a negative optical power. Its object side surface S10 is convex, and its image side surface S11 is concave. The filter E5 has an object side surface S12 and an image side surface S13. Light from the object sequentially passes through the surfaces of S1 to S13 and finally forms an image on the imaging surface S14.

[0241] As shown in Table 28, it is the basic parameter table of the four-piece optical imaging lens of Embodiment 9. Among them, the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0242]

[0243] Table 28

[0244] In Embodiment 9, the phase plate is an aspherical surface with non-rotational symmetry. The surface shape x of each aspherical lens with non-rotational symmetry can be defined by, but not limited to, the following aspherical formula:

[0245] z = 0.03x 3 + 0.03y 3 ;

[0246] where z is the sag height of the surface parallel to the z-axis direction; the SCO coefficients corresponding to the xy terms are from C2 to C66. The list of ASS surface coefficients in Embodiment 9 is shown in Table 29. In the list of AAS surface coefficients in Embodiment 9, the numerical values of the non-zero coefficients among the high-order XY coefficients C2 - C66 of each non-rotational symmetric aspherical surface are given, and the SCO coefficients not given are all 0.

[0247] AAS face C7 C10 S3 3.0000E-02 3.0000E-02

[0248] Table 29

[0249] As shown in Table 30, in Example 9, the total effective focal length f of the optical imaging lens is 1.16 mm, the distance TTL on the optical axis from the object side S1 of the planar glass P to the imaging surface S13 of the optical imaging lens is 3.54 mm, and half of the diagonal length of the effective pixel area on the imaging surface S13 is ImgH = 1.96 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 41.80°. The aperture value Fno of the optical imaging lens is 3.04.

[0250] The on-axis distance TOL from the object to the object side of the first lens is 2.73 mm.

[0251]

[0252] Table 30

[0253] In Example 9, the object side and the image side of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 31 shows the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 that can be used for each aspherical mirror surface S4 - S11 in Example 9.

[0254]

[0255]

[0256] Table 31

[0257] Figure 18a shows the axial chromatic aberration curve of the optical imaging lens in Example 9, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 18b shows the astigmatism curve of the optical imaging lens in Example 9, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 18c shows the distortion curve of the optical imaging lens in Example 9, which represents the distortion magnitude values corresponding to different image heights. Figure 18d shows the lateral chromatic aberration curve of the optical imaging lens in Example 9, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. As can be seen from Figures 18a to 18d shown, the optical imaging lens given in Example 9 can achieve good imaging quality. Specific Example 10

[0259] Figure 19 This is a schematic diagram of the lens group structure of Embodiment 10 of the four-piece optical imaging lens of the present invention. The four-piece optical imaging lens sequentially includes, along the optical axis from the object side to the image side: a planar glass P, a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an imaging surface S13.

[0260] The first lens E1 has a positive optical power. Its object side surface S4 is convex, and its image side surface S5 is convex. The second lens E2 has a negative optical power. Its object side surface S6 is convex, and its image side surface S7 is concave. The third lens E3 has a positive optical power. Its object side surface S8 is convex, and its image side surface S9 is convex. The fourth lens E4 has a negative optical power. Its object side surface S10 is convex, and its image side surface S11 is concave. The filter E5 has an object side surface S12 and an image side surface S13. Light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on the imaging surface S14.

[0261] As shown in Table 32, it is the basic parameter table of the four-piece optical imaging lens of Embodiment 10. Among them, the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0262]

[0263]

[0264] Table 32

[0265] In Embodiment 10, the phase plate is an aspherical surface with non-rotational symmetry. The surface profile x of each aspherical lens with non-rotational symmetry can be defined by, but not limited to, the following aspherical formula:

[0266] z = 0.03x 3 + 0.03y 3 ;

[0267] where z is the sag of the surface in the direction parallel to the z-axis; the SCO coefficients corresponding to the xy terms are C2 to C66. The list of ASS surface coefficients in Embodiment 10 is shown in Table 33. In the list of AAS surface coefficients in Embodiment 10, the numerical values of the non-zero coefficients among the high-order XY coefficients C2 - C66 of each non-rotational symmetric aspherical surface are given, and the SCO coefficients not given are all 0.

[0268] AAS face C7 C10 S3 3.0000E-02 3.0000E-02

[0269] Table 33

[0270] As shown in Table 34, in Embodiment 10, the total effective focal length f of the optical imaging lens is 1.16 mm, the distance TTL on the optical axis from the object side surface S1 of the planar glass P to the imaging surface S13 of the optical imaging lens is 3.53 mm, and half of the diagonal length of the effective pixel area on the imaging surface S13 is ImgH = 1.96 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 42.80°. The aperture value Fno of the optical imaging lens is 3.04.

[0271] The on-axis distance TOL from the object to the object side surface of the first lens is 2.74 mm.

[0272]

[0273] Table 34

[0274] In Embodiment 10, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 35 shows the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 that can be used for each aspherical mirror surface S4 - S11 in Embodiment 10.

[0275]

[0276]

[0277] Table 35

[0278] Figure 20a shows the axial chromatic aberration curve of the optical imaging lens in Embodiment 10, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 20b shows the astigmatism curve of the optical imaging lens in Embodiment 10, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 20c shows the distortion curve of the optical imaging lens in Embodiment 10, which represents the distortion magnitude values corresponding to different image heights. Figure 20d shows the longitudinal chromatic aberration curve of the optical imaging lens in Embodiment 10, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 20a to 20d shown, the optical imaging lens given in Embodiment 10 can achieve good imaging quality. Specific Embodiment 11

[0280] Figure 21 This is a schematic diagram of the lens group structure of Embodiment 11 of the four-piece optical imaging lens of the present invention. The four-piece optical imaging lens sequentially includes, from the object side to the image side along the optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an imaging surface S13.

[0281] The first lens E1 has a positive optical power. Its object side surface S1 is a convex surface, and its image side surface S2 is a convex 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 convex surface. The third lens E3 has a positive optical power. Its object side surface S5 is a convex surface, and its image side surface S6 is a convex surface. The fourth lens E4 has a negative optical power. Its object side surface S7 is a convex surface, and its image side surface S8 is a concave surface. The filter E5 has an object side surface S9 and an image side surface S10. Light from the object sequentially passes through the surfaces of S1 to S10 and finally forms an image on the imaging surface S11.

[0282] As shown in Table 32, it is the basic parameter table of the four-piece optical imaging lens of Embodiment 11. Among them, the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0283]

[0284]

[0285] Table 32

[0286] In Embodiment 11, the image side surface of the first lens is an aspherical surface with non-rotational symmetry. The surface shape x of each aspherical lens with non-rotational symmetry can be defined by, but not limited to, the following aspherical formula:

[0287]

[0288]

[0289]

[0290] Among them, z is the sag of the surface parallel to the z-axis direction; C is the curvature at the vertex; k is the conic coefficient; r is the radius value; ZP j is the jth Zernike polynomial; C j+1 is the coefficient of ZP j ; The Zernike terms range from ZP1 to ZP232, and their corresponding SCO coefficients are C1 to C250. In Embodiment 11, the AAS surface coefficient list is shown in Table 33, which gives the numerical values of the non-zero coefficients among the high-order Zernike coefficients C1 - C250 of each non-rotationally symmetric aspherical surface. The SCO coefficients not given are all 0.

[0291] AAS face C1 C2 C5 C7 C8 C11 C12 S2 3.8500E-01 -1.0000E+00 -8.0559E-01 -8.0559E-01 -1.7120E-03 -1.7120E-03 -2.3772E-03 AAS face C14 C16 C23 C25 C27 C29 C38 S2 -4.5354E-03 -2.3772E-03 2.3652E-02 6.7692E-02 6.7692E-02 2.3652E-02 -1.5428E-01 AAS face C40 C42 C44 C46 C57 C59 C61 S2 -5.9310E-01 -8.9283E-01 -5.9310E-01 -1.5428E-01 5.5456E-01 2.6593E+00 5.3888E+00 AAS face C63 C65 C67 C80 C82 C84 C86 S2 5.3889E+00 2.6593E+00 5.5457E-01 -1.2372E+00 -7.0865E+00 -1.8019E+01 -2.4366E+01 AAS face C88 C90 C92 C107 C109 C111 C113 S2 -1.8019E+01 -7.0866E+00 -1.2372E+00 1.7312E+00 1.1517E+01 3.5081E+01 5.9920E+01 AAS face C115 C117 C119 C121 C138 C140 C142 S2 5.9920E+01 3.5081E+01 1.1517E+01 1.7312E+00 -1.4802E+00 -1.1222E+01 -3.9679E+01 AAS face C144 C146 C148 C150 C152 C154 C173 S2 -8.1726E+01 -1.0351E+02 -8.1727E+01 -3.9680E+01 -1.1222E+01 -1.4802E+00 7.0748E-01 AAS face C175 C177 C179 C181 C183 C185 C187 S2 6.0287E+00 2.4207E+01 5.8189E+01 8.9212E+01 8.9212E+01 5.8189E+01 2.4207E+01 AAS face C189 C191 C212 C214 C216 C218 C220 S2 6.0287E+00 7.0748E-01 -1.4504E-01 -1.3748E+00 -6.1703E+00 -1.6907E+01 -3.0368E+01 AAS face C222 C224 C226 C228 C230 C232 S2 -3.6826E+01 -3.0368E+01 -1.6907E+01 -6.1704E+00 -1.3748E+00 -1.4504E-01

[0292] Table 33

[0293] As shown in Table 34, in Embodiment 11, the total effective focal length f of the optical imaging lens is 1.24 mm, the distance TTL on the optical axis from the object side S1 of the planar glass P to the imaging surface S13 of the optical imaging lens is 3.50 mm, and half of the diagonal length of the effective pixel region on the imaging surface S13 is ImgH = 1.93 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 67.04°. The aperture value Fno of the optical imaging lens is 3.04.

[0294] The on-axis distance TOL from the object to the object side of the first lens is 2.98 mm.

[0295]

[0296] Table 34

[0297] In Embodiment 11, the object side and the image side of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 35 shows the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 that can be used for each aspherical mirror surface S1-S8 in Embodiment 11.

[0298] Face number A4 A6 A8 A10 A12 A14 A16 S1 3.4254E-05 -3.5298E-04 -4.6992E-05 -3.9568E-06 -7.4312E-06 2.1886E-07 -2.2719E-06 S3 -3.8080E-02 -5.4096E-04 6.5300E-05 7.1593E-05 -1.1041E-05 4.6349E-06 -1.6219E-06 S4 -5.8369E-02 2.6564E-03 7.8563E-04 -2.9875E-04 -2.7154E-04 -6.0909E-05 1.4872E-05 S5 -2.1196E-03 3.5363E-03 1.6160E-03 -1.0508E-03 -4.7555E-04 -1.6169E-04 3.3734E-05 S6 -1.3883E-01 7.1792E-02 -9.2162E-03 6.6932E-03 -5.9627E-03 1.2845E-03 -1.2716E-03 S7 -4.0006E-01 8.7297E-02 -2.6830E-02 8.5538E-03 -7.2761E-03 2.6668E-03 -2.0838E-03 S8 -7.4699E-01 1.1700E-01 -4.9498E-02 1.4860E-02 -8.6969E-03 3.3458E-03 -1.7021E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 6.5832E-07 -1.0389E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 2.3004E-06 2.2433E-08 1.4908E-06 -3.6011E-07 0.0000E+00 0.0000E+00 0.0000E+00 S4 -5.9509E-06 -3.4777E-07 1.7632E-06 1.5851E-06 0.0000E+00 0.0000E+00 0.0000E+00 S5 -2.5934E-05 -2.0274E-05 -6.9224E-06 2.9347E-06 2.4754E-07 -1.7569E-07 3.9345E-07 S6 7.5658E-04 -2.5215E-04 1.8432E-04 -8.3999E-05 3.0213E-05 -1.1529E-05 -5.4167E-07 S7 9.7307E-04 -8.0575E-04 3.9994E-04 -2.4460E-04 1.4459E-04 -6.8076E-05 5.4542E-05 S8 7.6970E-04 -3.5500E-04 1.9226E-04 -1.0581E-04 6.2847E-05 2.2756E-05 1.3371E-05

[0299] Table 35

[0300] Figure 22a shows the axial chromatic aberration curve of the optical imaging lens in Embodiment 11, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 22b shows the astigmatism curve of the optical imaging lens in Embodiment 11, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 22c shows the distortion curve of the optical imaging lens in Embodiment 11, which represents the distortion magnitude values corresponding to different image heights. Figure 22d shows the lateral chromatic aberration curve of the optical imaging lens in Embodiment 11, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 22a to 22d shown, the optical imaging lens given in Embodiment 11 can achieve good imaging quality. Specific Embodiment 12

[0302] Figure 23 This is a schematic diagram of the lens group structure of Embodiment 12 of the four-piece optical imaging lens of the present invention. The four-piece optical imaging lens sequentially includes, along the optical axis from the object side to the image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an imaging surface S13.

[0303] The first lens E1 has a positive optical power. Its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has a negative 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 convex, and its image side surface S6 is convex. The fourth lens E4 has a negative optical power. Its object side surface S7 is convex, and its image side surface S8 is concave. The filter E5 has an object side surface S9 and an image side surface S10. Light from the object sequentially passes through the surfaces of S1 to S10 and finally forms an image on the imaging surface S11.

[0304] As shown in Table 36, it is the basic parameter table of the four-piece optical imaging lens of Embodiment 12. Among them, the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0305]

[0306] Table 36

[0307] In Embodiment 12, the image side surface of the first lens is an aspherical surface with non-rotational symmetry. The surface profile x of each aspherical lens with non-rotational symmetry can be defined by, but not limited to, the following aspherical formula:

[0308]

[0309]

[0310]

[0311] Among them, z is the sagittal height of the surface parallel to the z-axis direction; C is the curvature at the vertex; k is the conic coefficient; r is the radius value; ZP j is the jth Zernike polynomial; C j+1 is the coefficient of ZP j ; The Zernike terms range from ZP1 to ZP232, and their corresponding SCO coefficients are C1 to C250. In Embodiment 12, the AAS surface coefficient list is shown in Table 37, which gives the numerical values of the non-zero coefficients among the high-order Zernike coefficients C1 - C250 of each aspherical surface with non-rotational symmetry. The SCO coefficients not given are all 0.

[0312] AAS face C1 C2 C5 C7 C8 C11 C12 S2 3.8500E-01 -1.0000E+00 -8.0559E-01 -8.0559E-01 -1.7120E-03 -1.7120E-03 -2.3772E-03 AAS face C14 C16 C23 C25 C27 C29 C38 S2 -4.5354E-03 -2.3772E-03 2.3652E-02 6.7692E-02 6.7692E-02 2.3652E-02 -1.5428E-01 AAS face C40 C42 C44 C46 C57 C59 C61 S2 -5.9310E-01 -8.9283E-01 -5.9310E-01 -1.5428E-01 5.5456E-01 2.6593E+00 5.3888E+00 AAS face C63 C65 C67 C80 C82 C84 C86 S2 5.3889E+00 2.6593E+00 5.5457E-01 -1.2372E+00 -7.0865E+00 -1.8019E+01 -2.4366E+01 AAS face C88 C90 C92 C107 C109 C111 C113 S2 -1.8019E+01 -7.0866E+00 -1.2372E+00 1.7312E+00 1.1517E+01 3.5081E+01 5.9920E+01 AAS face C115 C117 C119 C121 C138 C140 C142 S2 5.9920E+01 3.5081E+01 1.1517E+01 1.7312E+00 -1.4802E+00 -1.1222E+01 -3.9679E+01 AAS face C144 C146 C148 C150 C152 C154 C173 S2 -8.1726E+01 -1.0351E+02 -8.1727E+01 -3.9680E+01 -1.1222E+01 -1.4802E+00 7.0748E-01 AAS face C175 C177 C179 C181 C183 C185 C187 S2 6.0287E+00 2.4207E+01 5.8189E+01 8.9212E+01 8.9212E+01 5.8189E+01 2.4207E+01 AAS face C189 C191 C212 C214 C216 C218 C220 S2 6.0287E+00 7.0748E-01 -1.4504E-01 -1.3748E+00 -6.1703E+00 -1.6907E+01 -3.0368E+01 AAS face C222 C224 C226 C228 C230 C232 S2 -3.6826E+01 -3.0368E+01 -1.6907E+01 -6.1704E+00 -1.3748E+00 -1.4504E-01

[0313] Table 37

[0314] As shown in Table 38, in Embodiment 12, the total effective focal length f of the optical imaging lens is 1.16 mm, the distance TTL on the optical axis from the object side S1 of the planar glass P to the imaging surface S13 of the optical imaging lens is 3.53 mm, and half of the diagonal length of the effective pixel region on the imaging surface S13 is ImgH = 1.75 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 28.22°. The aperture value Fno of the optical imaging lens is 3.93.

[0315] The on-axis distance TOL from the object to the object side of the first lens is 2.99 mm.

[0316]

[0317] Table 38

[0318] In Embodiment 12, the object side and the image side of any one of the first lens E1 to the fourth lens E4 are aspherical surfaces. Table 39 shows the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0319]

[0320]

[0321] Table 39

[0322] Figure 24a shows the axial chromatic aberration curve of the optical imaging lens of Embodiment 12, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 24b shows the astigmatism curve of the optical imaging lens of Embodiment 12, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 24c shows the distortion curve of the optical imaging lens of Embodiment 12, which represents the distortion magnitude values corresponding to different image heights. Figure 24d shows the longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 12, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 24a to 24dAs can be seen, the optical imaging lens provided in Embodiment 12 can achieve good imaging quality.

[0323] 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 within the protection scope of the present invention.

Claims

1. A four-piece optical imaging lens, characterized in that, The four-piece optical imaging lens has four lenses with optical powers, and the four-piece optical imaging lens sequentially includes, from the object side to the image side along the optical axis: A first lens group with a positive optical power, which is composed of a first lens and a second lens, where The first lens with a positive optical power has a convex object side and a convex image side; The second lens with a negative optical power has a concave image side; A second lens group with a positive optical power, which is composed of a third lens and a fourth lens, where The third lens with a positive optical power has a convex image side; The fourth lens with a negative optical power has a convex object side and a concave image side; Among them, the imaging brightness index Fno of the optical imaging system satisfies: 3 ≤ Fno ≤ 3.93; The central thickness CT3 of the third lens on the optical axis and the sum ∑CT of the central thicknesses of all lenses on the optical axis satisfy: 2.18 ≤ ∑CT / CT3 ≤ 2.66; The on-axis distance TOL from the object to the object side of the first lens satisfies: 2.63 mm ≤ TOL ≤ 10.74 mm; The effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the combined focal length F2 of the third lens and the fourth lens satisfy: -1.95 ≤ (f3 + f4) / F2 ≤ -1.

52.

2. The four-piece optical imaging lens according to claim 1, wherein, The magnification M of the optical imaging lens satisfies: 0 ≤ M ≤ 0.

99.

3. The four-piece optical imaging lens according to claim 1, wherein The combined focal length F1 of the first lens and the second lens and the combined focal length F2 of the third lens and the fourth lens satisfy: 0.47 ≤ F1 / F2 ≤ 1.

66.

4. The four-piece optical imaging lens according to claim 1, wherein, The central thickness CT1 of the first lens on the optical axis, 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: 0.75 ≤ CT3 / (CT1 / CT4) ≤ 1.

1.

5. The four-piece optical imaging lens according to claim 1, wherein, The effective focal length f1 of the first lens and the curvature radius R1 of the object side of the first lens satisfy: 0.58 ≤ R1 / f1 ≤ 0.

79.

6. The four-piece optical imaging lens according to claim 1, wherein There are air gaps between each of the lenses from the first lens to the fourth lens, which are independent of each other.

7. The four-piece optical imaging lens according to claim 1, wherein The optical imaging lens has at least one aspherical surface that is not rotationally symmetric.

8. The four-piece optical imaging lens according to claim 1, wherein, The edge thickness ET3 of the third lens, the edge thickness ET4 of the fourth lens, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 2 < ET3 / CT3 + ET4 / CT4 ≤ 2.

51.

9. The four-piece optical imaging lens according to claim 1, wherein The optical imaging lens has at least one phase plate.

10. The four-piece optical imaging lens according to claim 1, wherein, The on-axis distance TTL from the object side of the first lens to the imaging surface and the maximum effective radius DT42 of the image side of the fourth lens satisfy: 2.26 ≤ TTL / DT42 ≤ 2.78.

Images