An optical imaging system

Abstract

The present invention discloses an optical imaging system, comprising a first lens, whose image side is concave; a second lens; a third lens; a fourth lens with negative optical power; and a fifth lens with positive optical power, whose object side is convex and image side is concave; wherein the axial distance TTL from the object side of the first lens to the imaging surface and the effective focal length f of the optical imaging system directly satisfy the following: TTL / f<1.0. By controlling the ratio of the total system length TTL to the effective focal length f within a certain range, the telephoto characteristics and miniaturization characteristics of the camera lens group are achieved.

Description

Technical Field

[0001] The invention relates to an optical imaging lens, in particular to an optical imaging system composed of five lenses. Background Art

[0002] With the popularity of portable electronic products such as mobile phones and tablets, people's requirements for their imaging quality are getting higher and higher. At the same time, the current dual-camera technology generally requires the use of telephoto lenses to obtain higher spatial angular resolution. Traditional telephoto lenses have long focal lengths and a large number of lenses, resulting in a large total lens length. At the same time, because telephoto lenses have an obvious compression space distortion effect, the distortion is large. In order to meet the needs of market development, imaging lenses need to use as few lenses as possible to shorten the total length of the lens, but this results in a reduction in design freedom, which makes it difficult to meet the needs of high imaging quality. Summary of the invention

[0003] The present invention provides a five-piece telephoto optical imaging lens group, which adopts relatively few design degrees of freedom, can achieve system telephoto while having high resolution, and can better meet the use requirements of various special scenes.

[0004] The present invention solves the technical problem in the following manner: an optical imaging system, characterized in that it comprises:

[0005] The first lens has an image side concave surface;

[0006] Second lens;

[0007] The third lens;

[0008] a fourth lens having negative optical power;

[0009] A fifth lens having positive refractive power, with a convex object side surface and a concave image side surface;

[0010] TTL / f<1.0.

[0011] As a preferred embodiment of the present invention, the center thickness CT1 of the first lens on the optical axis, the air interval T12 between the first lens and the second lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 2.0 <CT1 / (T12+CT2)<3.0。

[0012] As a preferred embodiment of the present invention, the center thickness CT3 of the third lens on the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy: 0.5 <CT4 / CT3<2.0。

[0013] As a preferred embodiment of the present invention, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the curvature radius R8 of the image side surface of the fourth lens, and the curvature radius R9 of the object side surface of the fifth lens satisfy: 6.5 <f4 / R8+f5 / R9<12.8。

[0014] As a preferred embodiment of the present invention, the effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens satisfy: -1.5 <f4 / f<-0.5。

[0015] As a preferred embodiment of the present invention, the effective focal length f1 of the first lens and the curvature radius R1 of the object side of the first lens satisfy: 1.5 <f1 / R1<2.0。

[0016] As a preferred embodiment of the present invention, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the sum ΣCT of the center thicknesses of all lenses on the optical axis satisfy: ΣCT / TTL<0.35.

[0017] As a preferred embodiment of the present invention, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 1.0<|f2 / f1|<2.0.

[0018] As a preferred embodiment of the present invention, the focal length f2 of the second lens and the combined focal length f23 of the second lens and the third lens satisfy: 0.5<|f23 / f2|<1.5.

[0019] As a preferred embodiment of the present invention, the on-axis distance SAG41 between the intersection of the fourth lens object side and the optical axis to the effective radius vertex of the fourth lens object side, and the on-axis distance SAG42 between the intersection of the fourth lens image side and the optical axis to the effective radius vertex of the fourth lens image side satisfy: 5.5<(SAG41+SAG42) / (SAG41-SAG42)<11.5.

[0020] As a preferred embodiment of the present invention, the distance BFL from the image side of the last lens of the optical imaging system to the imaging surface on the optical axis and the sum of the center thicknesses ΣCT of all lenses on the optical axis satisfy: 1.0 <BFL / ΣCT<2.0。

[0021] As a preferred embodiment of the present invention, the axial distance TD from the object side of the first lens to the image side of the last lens and the sum of the air intervals ∑AT on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface satisfy: 1.5 <TD / ΣAT。

[0022] As a preferred embodiment of the present invention, the on-axis distance TTL from the object side of the first lens to the imaging surface and the distance BFL from the image side of the last lens of the optical imaging system to the imaging surface on the optical axis satisfy: 2.0 <TTL / BFL<2.3。

[0023] The beneficial effects of the present invention are as follows: the ratio of the total length of the system to the effective focal length is controlled within a certain range, so as to realize the telephoto characteristic and miniaturization characteristics of the camera lens group; by controlling the ratio of the center thickness of the first lens to the air gap, the field curvature contribution of each field of view of the system is controlled within a reasonable range, so as to balance the field curvature generated by other lenses and effectively improve the lens resolution; by controlling the ratio of the center thickness of the fourth lens to the third lens, the distortion contribution of each field of view of the optical imaging lens is controlled within a reasonable range, so as to improve the imaging quality; by controlling the sum of the ratios of the effective focal lengths of the fourth and fifth lenses to the image side curvature radius within a certain range, the contribution of the fourth and fifth lenses to the system sensitivity is reasonably controlled; by constraining the ratio of the effective focal length of the fourth lens to the combined focal length of the optical system, the field curvature of the constrained system can be reasonably controlled within a certain range; by controlling the ratio of the effective focal length of the first lens to the side curvature radius, the deflection angle of the light at the edge of the system can be reasonably controlled, so as to ensure that the optical lens has good processability and reduce the system sensitivity; By controlling the ratio of the on-axis distance from the object side of the first lens to the imaging surface to the sum of the center thicknesses of all lenses in the optical imaging lens, the distortion range of the optical imaging lens can be reasonably controlled, so that the system has a smaller distortion; by controlling the effective focal lengths of the second lens and the first lens, their contribution to the aberration of the entire optical system can be controlled, and the off-axis aberration of the system can be balanced, thereby improving the imaging quality of the system; by reasonably controlling the combined focal length of the second lens and the third lens within a certain range, the contribution of the aberrations of the two lenses can be controlled and balanced with the aberrations generated by the front-end optical imaging lens element, so that the aberrations of the optical imaging lens are at a reasonable level; by reasonably controlling the above ratio within a certain range, the shape of the fourth lens can be effectively controlled, the formability and processability of the fourth lens can be guaranteed, and at the same time, the difficulties in forming stress, coating, etc. caused by the excessive thickness of the fourth lens can be avoided; by reasonably controlling the ratio of the back focus to the sum of the center thicknesses of all lenses on the optical axis, the system field curvature can be controlled, so that the system has good imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1Schematic diagram of the structure of a lens assembly of an optical imaging lens embodiment 1 of the present invention;

[0026] Figure 2a to Figure 2c They are respectively the axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 1 of the present invention;

[0027] Figure 3 Schematic diagram of the lens group structure of Embodiment 2 of the optical imaging lens of the present invention;

[0028] Figures 4a to 4c They are respectively the axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 2 of the present invention;

[0029] Figure 5 Schematic diagram of the lens group structure of Embodiment 3 of the optical imaging lens of the present invention;

[0030] Figures 6a to 6c They are respectively the axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 3 of the present invention;

[0031] Figure 7 Schematic diagram of the lens group structure of Embodiment 4 of the optical imaging lens of the present invention;

[0032] Figures 8a to 8c They are respectively the axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 4 of the present invention;

[0033] Fig. 9 Schematic diagram of the lens group structure of Embodiment 5 of the optical imaging lens of the present invention;

[0034] Figures 10a to 10c They are respectively the axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 5 of the present invention;

[0035] Fig.11 Schematic diagram of the structure of a lens group of an optical imaging lens embodiment 6 of the present invention;

[0036] Figures 12a to 12c They are respectively the axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 6 of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0039] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0040] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0041] 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 is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0042] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal way unless explicitly defined in this article.

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The features, principles and other aspects of the present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0044] Exemplary Embodiments

[0045] The optical imaging lens according to an exemplary embodiment of the present invention includes five lenses, which sequentially include, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. Among them, each lens is independent of each other, and there is an air gap between each lens on the optical axis.

[0046] In this exemplary embodiment, an optical imaging system includes a first lens with a concave image side; a second lens; a third lens; a fourth lens with a negative optical power; a fifth lens with a positive optical power, having a convex object side and a concave image side; TTL / f < 1.0. Specifically, 0.90 < TTL / f < 1.0.

[0047] By controlling the ratio of the total system length TTL to the effective focal length f within a certain range, the telephoto characteristics and miniaturization of the camera lens group are achieved.

[0048] In this exemplary embodiment, the central thickness CT1 of the first lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 2.0 < CT1 / (T12 + CT2) < 3.0. Specifically, 2.00 < CT1 / (T12 + CT2) < 2.50.

[0049] By controlling the ratio of the central thickness CT1 of the first lens to the air gap, the field curvature contribution of each field of view of the system is controlled within a reasonable range to balance the field curvature generated by other lenses, effectively improving the resolution of the lens.

[0050] In this exemplary embodiment, 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: 0.5 < CT4 / CT3 < 2.0. Specifically, 0.50 < CT4 / CT3 < 1.60.

[0051] By controlling the ratio of the central thickness CT4 of the fourth lens to the central thickness CT3 of the third lens, the distortion contribution of each field of view of the optical imaging lens is controlled within a reasonable range, improving the imaging quality.

[0052] In this exemplary embodiment, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the curvature radius R8 of the image side of the fourth lens, and the curvature radius R9 of the object side of the fifth lens satisfy: 6.5 < f4 / R8 + f5 / R9 < 12.8. Specifically, 6.5 < f4 / R8 + f5 / R9 < 13.0.

[0053] By controlling the sum of the ratios of the effective focal length f4 of the fourth lens and the curvature radius R8 of the image side of the fourth lens, and the effective focal length f5 of the fifth lens and the curvature radius R9 of the object side of the fifth lens within a certain range, the contributions of the fourth and fifth lenses to the system sensitivity can be reasonably controlled.

[0054] In this exemplary embodiment, the effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens satisfy: -1.5 < f4 / f < -0.5. Specifically, -1.3 < f4 / f < -0.8.

[0055] By restricting the ratio of the effective focal length f4 of the fourth lens to the combined focal length f of the optical system, the field curvature of the restricted system can be reasonably controlled within a certain range.

[0056] In this exemplary embodiment, the effective focal length f1 of the first lens and the radius of curvature R1 of the object side surface of the first lens satisfy: 1.5 < f1 / R1 < 2.0. Specifically, 1.80 < f1 / R1 < 1.95.

[0057] By controlling the ratio of the effective focal length f1 of the first lens to the radius of curvature R1 of the object side surface, the deflection angle of the marginal rays of the system can be reasonably controlled, ensuring that the optical lens has good processability and reducing the system sensitivity.

[0058] In this exemplary embodiment, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the sum ΣCT of the central thicknesses of all lenses on the optical axis satisfy: ΣCT / TTL < 0.35. Specifically, 0.25 < ΣCT / TTL < 0.32.

[0059] By controlling the ratio of the on-axis distance TTL from the object side surface of the first lens to the imaging surface to the sum ΣCT of the central thicknesses of all lenses in the optical imaging lens, the distortion range of the optical imaging lens can be reasonably controlled, making the system have less distortion.

[0060] In this exemplary embodiment, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 1.0 < |f2 / f1| < 2.0. Specifically, 1.5 < |f2 / f1| < 2.0.

[0061] By controlling the effective focal length f2 of the second lens and the effective focal length f1 of the first lens, the contribution of the second lens to the aberration of the entire optical system can be controlled, balancing the off-axis aberration of the system, thereby improving the imaging quality of the system.

[0062] In this exemplary embodiment, the focal length f2 of the second lens and the combined focal length f23 of the second lens and the third lens satisfy: 0.5 < |f23 / f2| < 1.5. Specifically, 0.8 < |f23 / f2| < 1.4.

[0063] By reasonably controlling the combined focal length f23 of the second lens and the third lens and the focal length f2 of the second lens within a certain range, the contribution amounts of the aberrations of the two lenses can be controlled, balanced with the aberrations generated by the front-end optical imaging lens elements, and the aberrations of the optical imaging lens can be kept at a reasonable level.

[0064] In the present exemplary embodiment, the axial distance SAG41 between the intersection point of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens, and the axial distance SAG42 between the intersection point of the image side surface of the fourth lens and the optical axis and the vertex of the effective radius of the image side surface of the fourth lens satisfy: 5.5 < (SAG41 + SAG42) / (SAG41 - SAG42) < 11.5. Specifically, 5.8 < (SAG41 + SAG42) / (SAG41 - SAG42) < 11.4.

[0065] By reasonably controlling the above ratio within a certain range, the shape of the fourth lens can be effectively controlled, ensuring the formability and processability of the fourth lens, and at the same time avoiding difficulties in aspects such as forming stress and coating due to the excessive thickness of the fourth lens.

[0066] As a preferred embodiment of the present invention, the distance BFL on the optical axis from the image side surface of the last lens of the optical imaging system to the imaging surface, and the sum ΣCT of the central thicknesses of all lenses on the optical axis satisfy: 1.0 < BFL / ΣCT < 2.0. Specifically, 1.40 < BFL / ΣCT < 1.80.

[0067] By reasonably controlling the ratio of the back focal length BFL to the sum ΣCT of the central thicknesses of all lenses on the optical axis, the field curvature of the system is controlled, enabling the system to have good imaging quality.

[0068] As a preferred embodiment of the present invention, the axial distance TD from the object side surface of the first lens to the image side surface of the last lens, and the sum ∑AT of the air gaps on the optical axis between any two adjacent lenses with optical power among the first lens and the lenses closest to the imaging surface satisfy: 1.5 < TD / ΣAT. Specifically, 1.6 < TD / ΣAT < 2.4.

[0069] Reasonably distributing the air gap ΣAT of the camera lens group can ensure the processing and assembly characteristics, avoiding problems such as interference between the front and rear lenses during the assembly process due to too small a gap. At the same time, it is beneficial to slow down the light deflection, adjust the field curvature of the camera lens group, reduce the sensitivity, and thus obtain better imaging quality.

[0070] In this exemplary embodiment, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the on-axis distance BFL from the image side surface of the last lens of the optical imaging system to the imaging surface satisfy: 2.0 < TTL / BFL < 2.3. Specifically, 2.15 < TTL / BFL < 2.25. By controlling the maximum field of view to be maintained within a stable range and restricting the field of view, the focal length range of the system can be ensured, making the central light rays more convergent to improve clarity.

[0071] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the accompanying drawings: Specific Embodiment 1

[0073] Figure 1 FIG. 9 is a schematic structural diagram of the lens group of Embodiment 1 of the optical imaging lens of the present invention. The optical imaging lens 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 fifth lens E5, a filter E6, and an imaging surface S13.

[0074] The first lens E1 has a positive optical power. Its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a negative optical power. Its object side surface S3 is concave, 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 concave. The fourth lens has a negative optical power. Its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens has a positive optical power. Its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface S13.

[0075] As shown in Table 1, it is the basic parameter table of the optical imaging lens of Embodiment 1, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0076] Face number Surface type Radius of curvature thickness focal length Refractive Index Dispersion coefficient Cone coefficient OBJ Spherical endless endless STO Spherical endless -1.3692 S1 Aspheric 2.9260 1.4581 5.53 1.55 56.1 0.0000 S2 Aspheric 78.5624 0.3973 -99.0000 S3 Aspheric -9.2365 0.2334 -8.27 1.68 19.2 0.0000 S4 Aspheric 14.3750 0.9114 -2.8486 S5 Aspheric 3.5332 0.2563 30.72 1.67 20.4 -0.0023 S6 Aspheric 4.1451 1.1241 0.6944 S7 Aspheric -1.4835 0.3257 -12.61 1.55 56.1 -1.0000 S8 Aspheric -2.0380 0.5410 -1.0000 S9 Aspheric 9.9579 0.8110 30.11 1.62 25.9 0.0000 S10 Aspheric 20.7079 0.0415 0.0000 S11 Spherical endless 0.2100 1.51 64.2 0.0000 S12 Spherical endless 4.6900 S13 Spherical endless

[0077] Table 1

[0078] As shown in Table 2, in Embodiment 1, the overall parameters of the optical imaging lens and the numerical values of each relational expression are listed in Table 5:

[0079]

[0080]

[0081] Table 2

[0082] As shown in Table 2, the optical imaging lens in Embodiment 1 satisfies:

[0083] The overall focal length is f=11.69mm.

[0084] Total optical length TTL = 11 mm.

[0085] Half of the diagonal length of the effective pixel area on the imaging plane is ImgH=5.32mm.

[0086] Half of the maximum field of view angle Semi-FOV = 23.48°.

[0087] Aperture number Fno=2.37.

[0088] The ratio of the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the optical imaging system f is TTL / f=0.94.

[0089] The central thickness CT1 of the first lens on the optical axis, the air interval T12 between the first lens and the second lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy the relationship: CT1 / (T12+CT2)=2.31.

[0090] The center thickness CT3 of the third lens on the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy the relationship: CT4 / CT3=1.27

[0091] The effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy the relationship: f4 / R8+f5 / R9=9.27.

[0092] The effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens satisfy the relationship: f4 / f=-1.15.

[0093] The effective focal length f1 of the first lens and the curvature radius R1 of the object side surface of the first lens satisfy the relationship: f1 / R1=1.89.

[0094] The axial distance TTL from the object side of the first lens to the imaging surface and the sum of the center thickness of all lenses on the optical axis ΣCT satisfy the relationship: ΣCT / TTL=0.28

[0095] The effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: |f2 / f1|=1.49

[0096] The focal length f2 of the second lens of the first lens and the combined focal length f23 of the second lens and the third lens satisfy the relationship: |f23 / f2|=1.38.

[0097] The on-axis distance SAG41 between the intersection of the object side surface of the fourth lens and the optical axis to the effective radius vertex of the object side surface of the fourth lens, and the on-axis distance SAG42 between the intersection of the image side surface of the fourth lens and the optical axis to the effective radius vertex of the image side surface of the fourth lens satisfy the relationship: (SAG41+SAG42) / (SAG41-SAG42)=7.53.

[0098] The distance BFL from the image side surface of the last lens to the imaging plane on the optical axis and the sum of the center thicknesses of all lenses on the optical axis ΣCT satisfy the relationship: BFL / ΣCT=1.60.

[0099] The distance BFL from the image side surface to the imaging plane on the optical axis of the last lens, the center thickness CT4 of the fourth lens, the distance T45 between the fourth lens and the fifth lens, and the center thickness CT5 of the fifth lens satisfy the relationship: BFL / (CT4+T45+CT5)=2.95.

[0100] The axial distance TD from the object side of the first lens to the image side of the last lens and the sum of the air interval ΣAT on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface satisfy: TD / ΣAT=2.04.

[0101] The on-axis distance TTL from the object side of the first lens to the imaging plane and the distance BFL on the optical axis from the image side of the last lens of the optical imaging system to the imaging plane satisfy the relationship: TTL / BFL=2.22.

[0102] In Example 1, the object side surface and the image side surface of any lens among the first lens E1 to the fourth lens E4 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0103]

[0104] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1); k is the cone coefficient; Ai is the correction coefficient of the i-th order aspheric surface.

[0105] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. Table 3 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A5 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A22 , A 24 , A 26 , A 28 , A 30 .

[0106]

[0107]

[0108] Table 3

[0109] Figure 2a The axial chromatic aberration curve of the optical imaging lens of Example 1 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 2b The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 2c The magnification chromatic aberration curve of the optical imaging lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 2a to Figure 2c It can be seen from the figure that the optical imaging lens provided in Example 1 can achieve good imaging quality. Specific embodiment 2

[0111] Figure 3 Schematic diagram of the lens group structure of embodiment 2 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0112] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface of surfaces S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0113] As shown in Table 4, it is a basic parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0114] Face number Surface type Radius of curvature thickness focal length Refractive Index Dispersion coefficient Cone coefficient OBJ Spherical endless endless STO Spherical endless -1.3692 S1 Aspheric 2.9484 1.4187 5.60 1.55 56.1 0.0000 S2 Aspheric 70.3635 0.3655 -99.0000 S3 Aspheric -5.8912 0.2247 -9.84 1.68 19.2 0.0000 S4 Aspheric -51.3965 0.9668 12.3846 S5 Aspheric 4.5713 0.3603 78.98 1.67 20.4 -0.3884 S6 Aspheric 4.8476 1.1894 0.6728 S7 Aspheric -1.4225 0.3480 -13.18 1.55 56.1 -1.0000 S8 Aspheric -1.9264 0.2221 -1.0000 S9 Aspheric 9.7922 0.9664 27.77 1.62 25.9 0.0000 S10 Aspheric 21.8865 0.0380 0.0000 S11 Spherical endless 0.2100 1.51 64.2 0.0000 S12 Spherical endless 4.6900 S13 Spherical endless

[0115] Table 4

[0116] As shown in Table 5, in Example 2, the overall parameters of the optical imaging lens and the values ​​of each relational expression are as listed in Table 5:

[0117]

[0118] Table 5

[0119] In Example 2, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E5 are aspherical surfaces. Table 6 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A5 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 , A 30 .

[0120]

[0121]

[0122] Table 6

[0123] Figure 4a The axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 4b The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 4c The magnification chromatic aberration curve of the optical imaging lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 4a to 4c It can be seen from the figure that the optical imaging lens provided in Example 2 can achieve good imaging quality. Specific embodiment 3

[0125] Figure 5 Schematic diagram of the lens group structure of embodiment 3 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0126] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface of surfaces S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0127] As shown in Table 7, it is a basic parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0128] Face number Surface type Radius of curvature thickness focal length Refractive Index Dispersion coefficient Cone coefficient OBJ Spherical endless endless STO Spherical endless -1.3692 S1 Aspheric 2.8413 1.4811 5.48 1.55 56.1 0.0000 S2 Aspheric 47.0873 0.3462 -99.0000 S3 Aspheric 32.6816 0.2670 -10.74 1.68 19.2 0.0000 S4 Aspheric 9.3878 1.0164 0.6731 S5 Aspheric -16.9642 0.4294 -47.84 1.67 20.4 -92.1058 S6 Aspheric -36.5759 0.9210 -99.0000 S7 Aspheric -1.2539 0.2391 -11.00 1.55 56.1 -1.0000 S8 Aspheric -1.6916 0.5873 -1.0000 S9 Aspheric 4.3288 0.7175 14.40 1.62 25.9 0.0000 S10 Aspheric 7.8805 0.0949 0.0000 S11 Spherical endless 0.2100 1.51 64.2 0.0000 S12 Spherical endless 4.6900 S13 Spherical endless

[0129] Table 7

[0130] As shown in Table 8, the overall parameters of the optical imaging lens in Example 3 and the values ​​of each relational expression are listed in Table 11:

[0131]

[0132] Table 8

[0133] In Example 3, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. Table 9 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A2 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 , A 30 .

[0134]

[0135]

[0136] Table 9

[0137] Figure 6a The axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 6bThe astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 6c The magnification chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 6a to 6c It can be seen from the figure that the optical imaging lens provided in Example 3 can achieve good imaging quality. Specific embodiment 4

[0139] Figure 7 Schematic diagram of the lens group structure of embodiment 4 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0140] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface of surfaces S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0141] As shown in Table 10, it is a basic parameter table of the optical imaging lens of Example 4, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0142] Face number Surface type Radius of curvature thickness focal length Refractive Index Dispersion coefficient Cone coefficient OBJ Spherical endless endless STO Spherical endless -1.3692 S1 Aspheric 2.8511 1.5025 5.40 1.55 56.1 0.0000 S2 Aspheric 73.9512 0.3918 -99.0000 S3 Aspheric -15.1714 0.2488 -9.38 1.68 19.2 0.0000 S4 Aspheric 11.0101 0.9646 -1.2731 S5 Aspheric -39.0295 0.4231 459.45 1.67 20.4 -99.0000 S6 Aspheric -34.7716 0.8098 -99.0000 S7 Aspheric -1.3080 0.2646 -11.21 1.55 56.1 -1.0000 S8 Aspheric -1.7828 0.6922 -1.0000 S9 Aspheric 5.0405 0.7110 18.14 1.62 25.9 0.0000 S10 Aspheric 8.6501 0.0917 0.0000 S11 Spherical endless 0.2100 1.51 64.2 0.0000 S12 Spherical endless 4.6900 S13 Spherical endless

[0143] Table 10

[0144] As shown in Table 11, the overall parameters of the optical imaging lens in Example 4 and the values ​​of each relational expression are listed in the following table:

[0145]

[0146] Table 11

[0147] In Example 4, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. Table 12 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A 10 , A 12 , A 14 , A 16 , A18 , A 20 , A 22 , A 24 , A 26 , A 28 , A 30 .

[0148] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.4871E-04 2.6378E-04 -2.5304E-04 1.1459E-04 -2.9782E-05 4.0301E-06 -2.3214E-07 S2 2.8854E-03 4.7530E-04 -1.8215E-03 2.2764E-03 -1.8289E-03 9.7573E-04 -3.4165E-04 S3 2.0904E-02 -7.0136E-03 1.9444E-03 -1.7742E-04 -5.7583E-05 1.7311E-05 -1.3618E-06 S4 1.5589E-02 -5.7731E-03 2.4025E-03 -5.9897E-03 1.6672E-02 -2.6753E-02 2.7422E-02 S5 -4.0370E-02 7.5466E-03 -1.1744E-02 2.6028E-02 -2.2636E-02 -9.7830E-03 5.0970E-02 S6 -3.7496E-02 3.4926E-03 2.4707E-02 -8.9852E-02 2.2060E-01 -3.6239E-01 4.1522E-01 S7 8.3825E-02 -5.9673E-03 -1.7492E-03 -1.5431E-03 9.1306E-04 -2.0101E-04 1.6079E-05 S8 6.8691E-02 5.8073E-03 -1.1248E-02 9.1401E-03 -8.8527E-03 6.2167E-03 -2.9283E-03 S9 -2.9109E-02 8.8968E-03 -4.3320E-03 2.0887E-03 -8.0986E-04 2.3111E-04 -4.7240E-05 S10 -2.2102E-02 6.0755E-03 -3.5671E-03 2.1669E-03 -1.0328E-03 3.6096E-04 -9.2049E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 7.4533E-05 -8.1505E-06 -2.8267E-07 2.3109E-07 -3.3285E-08 2.2304E-09 -6.0198E-11 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -1.9029E-02 9.1543E-03 -3.0602E-03 6.9813E-04 -1.0371E-04 9.0452E-06 -3.5141E-07 S5 -6.6219E-02 4.9585E-02 -2.3952E-02 7.5964E-03 -1.5331E-03 1.7891E-04 -9.2035E-06 S6 -3.3934E-01 1.9902E-01 -8.3110E-02 2.4107E-02 -4.6143E-03 5.2380E-04 -2.6697E-05 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 9.4258E-04 -2.0644E-04 2.9485E-05 -2.4749E-06 9.2352E-08 0.0000E+00 0.0000E+00 S9 6.8351E-06 -6.9050E-07 4.7591E-08 -2.1452E-09 5.8246E-11 -7.9329E-13 2.9889E-15 S10 1.7154E-05 -2.3259E-06 2.2613E-07 -1.5302E-08 6.8215E-10 -1.7960E-11 2.1111E-13

[0149] Table 12

[0150] Figure 8a The axial chromatic aberration curve of the optical imaging lens of Example 4 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 8b The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 8c The magnification chromatic aberration curve of the optical imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 8a to 8c It can be seen from the figure that the optical imaging lens provided in Example 4 can achieve good imaging quality. Specific embodiment 5

[0152] Fig. 9 Schematic diagram of the lens group structure of embodiment 5 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0153] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface of surfaces S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0154] As shown in Table 13, it is a basic parameter table of the optical imaging lens of Example 5, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0155] Face number Surface type Radius of curvature thickness focal length Refractive Index Dispersion coefficient Cone coefficient OBJ Spherical endless endless STO Spherical endless -1.3692 S1 Aspheric 2.9127 1.4305 5.65 1.55 56.1 0.0000 S2 Aspheric 43.4495 0.3241 -26.2950 S3 Aspheric -19.1526 0.2643 -8.69 1.68 19.2 0.0000 S4 Aspheric 8.5439 0.9230 1.4357 S5 Aspheric 3.8466 0.2836 40.64 1.67 20.4 0.1207 S6 Aspheric 4.3503 1.0873 0.0569 S7 Aspheric -1.5233 0.3094 -13.96 1.55 56.1 -1.0000 S8 Aspheric -2.0405 0.7194 -1.0000 S9 Aspheric 5.0333 0.5611 28.75 1.62 25.9 0.0000 S10 Aspheric 6.7175 0.1973 0.0000 S11 Spherical endless 0.2100 1.51 64.2 0.0000 S12 Spherical endless 4.6900 S13 Spherical endless

[0156] Table 13

[0157] As shown in Table 14, the overall parameters of the optical imaging lens in Example 5 and the values ​​of each relational expression are listed in the following table:

[0158]

[0159] Table 14

[0160] In Example 5, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. Table 15 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 , A 30 .

[0161] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.1531E-04 6.6309E-05 -9.4328E-05 4.4346E-05 -1.2165E-05 1.6936E-06 -1.0637E-07 S2 6.2529E-03 -1.9724E-03 3.4023E-03 -5.9036E-03 6.6330E-03 -5.0800E-03 2.7409E-03 S3 2.0025E-02 -4.1784E-03 5.7916E-04 3.1717E-05 -3.5027E-05 6.1382E-06 -3.8182E-07 S4 9.4025E-03 -3.2255E-03 9.6998E-03 -2.2997E-02 3.5915E-02 -3.8554E-02 2.9373E-02 S5 -4.1861E-02 -2.6240E-03 2.6990E-02 -6.5341E-02 1.0814E-01 -1.1897E-01 8.9466E-02 S6 -3.8444E-02 2.5281E-03 6.4333E-03 -8.5587E-03 8.1856E-03 2.3763E-03 -1.5269E-02 S7 8.4443E-02 -2.4208E-02 3.8067E-03 1.3372E-03 -1.3207E-03 3.7844E-04 -4.0555E-05 S8 7.9503E-02 -2.0055E-02 8.6130E-03 -8.5975E-03 8.7284E-03 -6.4776E-03 3.2717E-03 S9 -1.0825E-02 -2.4276E-03 2.4419E-03 -1.1659E-03 3.8903E-04 -9.3603E-05 1.6155E-05 S10 -1.4844E-02 2.5446E-03 -1.6275E-03 1.2250E-03 -6.3538E-04 2.2533E-04 -5.5982E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -1.0592E-03 2.9432E-04 -5.8312E-05 8.0350E-06 -7.3157E-07 3.9561E-08 -9.6206E-10 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -1.6119E-02 6.3864E-03 -1.8088E-03 3.5693E-04 -4.6585E-05 3.6128E-06 -1.2601E-07 S5 -4.6183E-02 1.5928E-02 -3.3606E-03 3.0372E-04 3.1287E-05 -1.0496E-05 7.6989E-07 S6 1.9005E-02 -1.3379E-02 6.0563E-03 -1.8016E-03 3.4174E-04 -3.7561E-05 1.8225E-06 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -1.1213E-03 2.5814E-04 -3.8341E-05 3.3258E-06 -1.2815E-07 0.0000E+00 0.0000E+00 S9 -1.9726E-06 1.6620E-07 -9.2091E-09 3.0114E-10 -3.9686E-12 -5.1628E-14 1.6814E-15 S10 9.8873E-06 -1.2454E-06 1.1089E-07 -6.8072E-09 2.7376E-10 -6.4859E-12 6.8577E-14

[0162] Table 15

[0163] Fig.10a The axial chromatic aberration curve of the optical imaging lens of Example 5 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig.10b The astigmatism curve of the optical imaging lens of Example 5 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.10c The magnification chromatic aberration curve of the optical imaging lens of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 10a to 10c It can be seen from the figure that the optical imaging lens provided in Example 5 can achieve good imaging quality. Specific embodiment 6

[0165] Fig.11 Schematic diagram of the lens group structure of embodiment 6 of the optical imaging lens of the present invention. The optical imaging lens comprises, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6 and an imaging surface S13.

[0166] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The filter E6 has an object side surface S11 and an image side surface S12. The light from the object passes through each surface of surfaces S1 to S12 in sequence and is finally imaged on the imaging surface S13.

[0167] As shown in Table 16, it is a basic parameter table of the optical imaging lens of Example 6, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0168] Face number Surface type Radius of curvature thickness focal length Refractive Index Dispersion coefficient Cone coefficient OBJ Spherical endless endless STO Spherical endless -1.3692 S1 Aspheric 2.8316 1.4539 5.47 1.55 1.55,56.1 0.0000 S2 Aspheric 45.2735 0.3171 -99.0000 S3 Aspheric -212.1768 0.2719 -9.69 1.68 1.68,19.2 0.0000 S4 Aspheric 6.7794 0.9733 2.1575 S5 Aspheric 4.9926 0.2398 -126.60 1.67 1.67,20.4 0.3053 S6 Aspheric 4.6234 1.1381 0.2973 S7 Aspheric -1.4223 0.3628 -12.69 1.55 1.55,56.1 -1.0000 S8 Aspheric -1.9510 0.2802 -1.0000 S9 Aspheric 8.4007 1.0279 18.57 1.62 1.62,25.9 0.0000 S10 Aspheric 29.7090 0.0349 0.0000 S11 Spherical endless 0.2100 1.51 1.51,64.2 0.0000 S12 Spherical endless 4.6900 S13 Spherical endless

[0169] Table 16

[0170] As shown in Table 17, the overall parameters of the optical imaging lens and the values ​​of each relational expression in Example 6 are listed in the following table:

[0171]

[0172]

[0173] Table 17

[0174] In Example 6, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. Table 18 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 , A 30 .

[0175] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.7645E-04 1.7223E-04 -1.9763E-04 9.1457E-05 -2.4824E-05 3.4258E-06 -2.0802E-07 S2 5.8811E-03 -9.9511E-04 2.8243E-04 -9.7812E-04 1.5044E-03 -1.3628E-03 8.2040E-04 S3 1.8839E-02 -4.8744E-03 7.1894E-04 1.2075E-04 -7.6599E-05 1.3750E-05 -9.2273E-07 S4 1.1695E-02 -3.5841E-03 6.1260E-03 -1.6897E-02 3.2916E-02 -4.3354E-02 3.9898E-02 S5 -4.8548E-02 1.4831E-02 -3.5294E-02 1.1736E-01 -2.5404E-01 3.8750E-01 -4.2421E-01 S6 -4.7127E-02 1.7281E-02 -3.0982E-02 8.5394E-02 -1.5046E-01 1.8468E-01 -1.5915E-01 S7 8.5416E-02 -3.1389E-02 1.2654E-02 -3.7694E-03 3.9715E-04 4.8224E-05 -1.1521E-05 S8 7.3276E-02 -2.5078E-02 1.6691E-02 -1.3721E-02 1.0882E-02 -7.0370E-03 3.2780E-03 S9 -1.4696E-02 -2.6930E-03 5.0516E-03 -3.4971E-03 1.6192E-03 -5.3754E-04 1.2961E-04 S10 -1.6280E-02 4.3066E-03 -2.5002E-03 1.4624E-03 -6.6712E-04 2.2317E-04 -5.4238E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -3.4261E-04 1.0081E-04 -2.0859E-05 2.9749E-06 -2.7870E-07 1.5454E-08 -3.8472E-10 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -2.6096E-02 1.2183E-02 -4.0267E-03 9.1956E-04 -1.3791E-04 1.2214E-05 -4.8385E-07 S5 3.3598E-01 -1.9255E-01 7.9001E-02 -2.2603E-02 4.2803E-03 -4.8181E-04 2.4397E-05 S6 9.5429E-02 -3.8710E-02 9.8774E-03 -1.2490E-03 -3.8183E-05 3.2811E-05 -2.9973E-06 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -1.0556E-03 2.2931E-04 -3.2124E-05 2.6234E-06 -9.5006E-08 0.0000E+00 0.0000E+00 S9 -2.2719E-05 2.8764E-06 -2.5908E-07 1.6126E-08 -6.5759E-10 1.5775E-11 -1.6855E-13 S10 9.5582E-06 -1.2151E-06 1.0993E-07 -6.8869E-09 2.8361E-10 -6.9049E-12 7.5364E-14

[0176] Table 18

[0177] Fig.12a The axial chromatic aberration curve of the optical imaging lens of Example 6 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 12bThe astigmatism curve of the optical imaging lens of Example 6 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.12c The magnification chromatic aberration curve of the optical imaging lens of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 12a to 12c It can be seen from the figure that the optical imaging lens provided in Example 8 can achieve good imaging quality.

[0178] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical imaging system, characterized in that: The optical imaging system has five lenses, which include: A first lens having positive refractive power, a convex surface on the object side and a concave surface on the image side; a second lens having negative optical power; a third lens having optical power; a fourth lens element having negative optical power, the object side surface of which is concave and the image side surface of which is convex; A fifth lens having positive refractive power, with a convex object side surface and a concave image side surface; The effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens satisfy: -1.27≤f4 / f≤-1; The on-axis distance TTL from the object side of the first lens to the imaging plane and the distance BFL on the optical axis from the image side of the last lens of the optical imaging system to the imaging plane satisfy: 2.16≤TTL / BFL≤2.

23.

2. The optical imaging system according to claim 1, characterized in that: The on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length f of the optical imaging system directly satisfy the following: 0.94≤TTL / f≤0.

95.

3. The optical imaging system according to claim 1, characterized in that: The center thickness CT1 of the first lens on the optical axis, the air interval T12 between the first lens and the second lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 2.31≤CT1 / (T12+CT2)≤2.

47.

4. The optical imaging system according to claim 1, characterized in that: A center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy the following: 0.56≤CT4 / CT3≤1.

51.

5. The optical imaging system according to claim 1, characterized in that: The effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: 8.72≤f4 / R8+f5 / R9≤12.

6.

6. The optical imaging system according to claim 1, characterized in that: The effective focal length f1 of the first lens and the curvature radius R1 of the object side surface of the first lens satisfy: 1.89≤f1 / R1≤1.

94.

7. The optical imaging system according to claim 1, characterized in that: The on-axis distance TTL from the object side surface of the first lens to the imaging surface and the sum ΣCT of the center thicknesses of all lenses on the optical axis satisfy: 0.26≤ΣCT / TTL≤0.

31.

8. The optical imaging system according to claim 1, characterized in that: The effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 1.49≤|f2 / f1|≤1.

96.

9. The optical imaging system according to claim 1, characterized in that: A focal length f2 of the second lens and a combined focal length f23 of the second lens and the third lens satisfy: 0.81≤|f23 / f2|≤1.

38.

10. The optical imaging system according to claim 1, characterized in that: The on-axis distance SAG41 between the intersection of the object side of the fourth lens and the optical axis to the effective radius vertex of the object side of the fourth lens, and the on-axis distance SAG42 between the intersection of the image side of the fourth lens and the optical axis to the effective radius vertex of the image side of the fourth lens satisfy: 6.09≤(SAG41+SAG42) / (SAG41-SAG42)≤11.

14.

11. The optical imaging system according to claim 1, characterized in that: The distance BFL from the image side surface to the imaging surface of the last lens of the optical imaging system on the optical axis and the sum of the center thicknesses ΣCT of all lenses on the optical axis satisfy: 1.47≤BFL / ΣCT≤1.

79.

12. The optical imaging system according to claim 1, characterized in that: The axial distance TD from the object side of the first lens to the image side of the last lens and the sum of the air intervals ΣAT on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface satisfy: 1.93≤TD / ΣAT≤2.24.

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