Optical imaging device

Abstract

The application provides an optical imaging device. The optical imaging device comprises a lens barrel, a lens group arranged in the lens barrel, and a plurality of spacer elements, the lens group is composed of seven lenses, the seven lenses are sequentially a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis of the optical imaging device; the first lens has a negative focal power, an object side surface of the first lens is a convex surface, and an image side surface of the first lens is a concave surface; the following conditions are met: -4.15 < f1 / (R1+R2) < -1.00; the following condition is met: -11.50 < f1 / D1s < -4.60; and the following condition is met: 3.40 < (D1s-d1s) / EP12 < 6.75. The application solves the problem that the prior art seven-piece optical imaging device controls the effective focal length and the radius of curvature of the front end lens, limits the size of the front end structure, easily causes the front end lens group to be deformed and stress concentrated during assembly, and further causes the assembly stability to be poor.

Description

Technical Field

[0001] This invention relates to the field of optical imaging equipment technology, and more specifically, to an optical imaging device. Background Technology

[0002] Optical imaging devices play a crucial role in modern technology applications, especially in portable electronic devices such as mobile phones, where their performance directly impacts the user experience. With the increasing demand for high definition and miniaturization, the design of optical imaging devices faces unprecedented challenges. In the design of optical imaging devices, seven-element optical imaging devices are widely adopted due to their balance between cost, weight, and performance.

[0003] However, existing seven-element optical imaging devices, by controlling the optical parameters of the front lens, such as the effective focal length and radius of curvature, compress the size of the front structure of the optical imaging device. Due to the different coefficients of thermal expansion of the materials of the various components in the optical imaging device when the temperature changes, the front lens is prone to assembly deformation and stress concentration when its size changes due to temperature during the assembly process or reliability verification process, which seriously affects the assembly stability.

[0004] In other words, the existing seven-element optical imaging device has limitations in controlling the effective focal length and radius of curvature of the front lens, which restricts the size of the front structure and easily causes deformation and stress concentration in the front lens assembly, thus leading to poor assembly stability. Summary of the Invention

[0005] The main objective of this invention is to provide an optical imaging device that addresses the problem in existing seven-element optical imaging devices where controlling the effective focal length and radius of curvature of the front-end lens limits the size of the front-end structure, easily causing deformation and stress concentration in the front-end lens assembly, and consequently leading to poor assembly stability.

[0006] To achieve the above objective, according to one aspect of the present invention, there is provided an optical imaging device, comprising a lens barrel, a lens group and a plurality of spacing elements disposed in the lens barrel, wherein the lens group consists of seven lenses, and the seven lenses are sequentially a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens along the optical axis of the optical imaging device from the object side to the image side; there is an air spacing between every two adjacent lenses from the first lens to the seventh lens; the first lens has negative optical power, the object-side surface of the first lens is a convex surface, and the image-side surface of the first lens is a concave surface; the plurality of spacing elements comprise a first spacing element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens, and a second spacing element disposed between the second lens and the third lens and in contact with the image-side surface of the second lens; the effective focal length f1 of the first lens, the curvature radius R1 of the object-side surface of the first lens and the curvature radius R2 of the image-side surface of the first lens satisfy: -4.15<f1 / (R1+R2)<-1.00; the effective focal length f1 of the first lens and the outer diameter D1s of the object-side surface of the first spacing element satisfy: -11.50<f1 / D1s<-4.60; the outer diameter D1s of the object-side surface of the first spacing element, the inner diameter d1s of the object-side surface of the first spacing element and the spacing distance EP12 between the image-side surface of the first spacing element and the object-side surface of the second spacing element on the optical axis satisfy: 3.40<(D1s-d1s) / EP12<6.75.

[0007] According to another aspect of the present invention, there is also provided an optical imaging device, comprising a lens barrel, a lens group and a plurality of spacing elements disposed in the lens barrel, wherein the lens group consists of seven lenses, and the seven lenses are sequentially a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens along the optical axis of the optical imaging device from the object side to the image side; there is an air spacing between every two adjacent lenses from the first lens to the seventh lens; the first lens has negative optical power, the object-side surface of the first lens is a convex surface, and the image-side surface of the first lens is a concave surface; the plurality of spacing elements comprise a first spacing element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens, and a second spacing element disposed between the second lens and the third lens and in contact with the image-side surface of the second lens; the effective focal length f1 of the first lens, the curvature radius R1 of the object-side surface of the first lens and the curvature radius R2 of the image-side surface of the first lens satisfy: -4.15<f1 / (R1+R2)<-1.00; the curvature radius R2 of the image-side surface of the first lens, the curvature radius R5 of the object-side surface of the third lens, the inner diameter d2s of the object-side surface of the second spacing element and the inner diameter d1m of the image-side surface of the first spacing element satisfy: 3.05<(R5×d2s) / (R2×d1m)<6.15.

[0008] Furthermore, the plurality of spacers also includes a third spacer element positioned between the third and fourth lenses and in contact with the image-side surface of the third lens. The radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens satisfy the following condition: 1.25 < (R5 + R6) / (R5 - R6) < 1.80; the combined focal length f23 of the second and third lenses and the distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element on the optical axis satisfy the following condition: 24.45 <f23 / EP23<86.20。

[0009] Furthermore, the plurality of spacers also includes a third spacer element positioned between the third and fourth lenses and in contact with the image-side surface of the third lens, and a fourth spacer element positioned between the fourth and fifth lenses and in contact with the image-side surface of the fourth lens. The combined focal length f34 of the third and fourth lenses and the optical axis spacing EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element satisfy: 15.05 <f34 / EP34<26.30。

[0010] Furthermore, the plurality of spacers also includes a fourth spacer element positioned between the fourth and fifth lenses and in contact with the image-side surface of the fourth lens, and a fifth spacer element positioned between the fifth and sixth lenses and in contact with the image-side surface of the fifth lens. The combined focal length f45 of the fourth and fifth lenses and the optical axis spacing EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element satisfy: 7.05 <f45 / EP45<8.05。

[0011] Furthermore, the plurality of spacers also includes a third spacer element placed between the third and fourth lenses and in contact with the image-side surface of the third lens, and a fourth spacer element placed between the fourth and fifth lenses and in contact with the image-side surface of the fourth lens. The axial displacement SAG42 between the spacing EP34 on the optical axis between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element and the intersection point of the image-side surface of the fourth lens and the optical axis and the effective radius vertex of the image-side surface of the fourth lens satisfies: 1.25 <EP34 / |SAG42|<1.50。

[0012] Furthermore, the plurality of spacers also includes a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens, wherein the effective focal length f5 of the fifth lens and the outer diameter D5s of the object side of the fifth spacer element satisfy the following condition: 6.05 < |f5| / D5s < 11.15.

[0013] Furthermore, the plurality of spacers also includes a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens, and a sixth spacer element placed between the sixth lens and the seventh lens and in contact with the image side of the sixth lens. The air gap T56 between the fifth lens and the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the spacing distance EP56 between the image side of the fifth spacer element and the object side of the sixth spacer element on the optical axis satisfy the following: 1.85 < (T56 + CT6 + T67) / EP56 < 2.10.

[0014] Furthermore, the plurality of spacers also includes a fifth spacer element placed between the fifth and sixth lenses and in contact with the image-side surface of the fifth lens, and a sixth spacer element placed between the sixth and seventh lenses and in contact with the image-side surface of the sixth lens. The spacing distance EP56 between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element on the optical axis and the axial displacement SAG52 between the intersection of the image-side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image-side surface of the fifth lens satisfy: 3.10 <EP56 / |SAG52|<4.15。

[0015] Furthermore, the outer diameter D0s of the object side of the lens tube, the outer diameter D0m of the image side of the lens tube, and the effective focal length f of the optical imaging device satisfy the following condition: 0.70 < (D0m - D0s) / f < 0.85.

[0016] Furthermore, the inner diameter d0s of the object side of the lens barrel, the inner diameter d0m of the image side of the lens barrel, and the axial distance TD between the object side of the first lens and the image side of the seventh lens satisfy the following condition: 1.05 < (d0m - d0s) / TD < 1.35.

[0017] Furthermore, the radius of curvature R2 of the image side of the first lens, the radius of curvature R5 of the object side of the third lens, the inner diameter d2s of the object side of the second spacer element and the inner diameter d1m of the image side of the first spacer element satisfy the following condition: 3.05 < (R5 × d2s) / (R2 × d1m) < 6.15.

[0018] Furthermore, the plurality of spacers also includes a sixth spacer element positioned between the sixth and seventh lenses and in contact with the image-side surface of the sixth lens. The radius of curvature R11 of the object-side surface of the sixth lens, the refractive index N6 of the sixth lens, the outer diameter D6s of the object-side surface of the sixth spacer element, and the inner diameter d6s of the object-side surface of the sixth spacer element satisfy the following relationship: 2.55 <R11×N6 / (D6s-d6s)<3.70。

[0019] Further, the plurality of spacing elements further comprises a fifth spacing element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens, wherein the inner diameter d5s of the object-side surface of the fifth spacing element, the outer diameter D5s of the object-side surface of the fifth spacing element, and the effective radius DT52 of the image-side surface of the fifth lens satisfy: 0.95<(D5s-d5s) / DT52<1.35.

[0020] Further, the plurality of spacing elements further comprises a third spacing element disposed between the third lens and the fourth lens and in contact with the image-side surface of the third lens, wherein the central thickness CT3 of the third lens on the optical axis and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 1.50<CT3 / T34<2.80; the inner diameter d3s of the object-side surface of the third spacing element and the radial distance Yc32 from the inflection point, which is located on the image-side surface of the effective diameter portion of the third lens and away from the optical axis, to the optical axis satisfy: 3.15<d3s / Yc32<3.80.

[0021] By applying the technical solution of the present invention, in the optical imaging apparatus of the present application, by configuring that the first lens has negative power, the object-side surface of the first lens is a convex surface, and the image-side surface of the first lens is a concave surface, the basic parameters of the first lens in the present case satisfy -4.15<f1 / (R1+R2)<-1.00. Considering that temperature drift will affect the deformation of the first lens, resulting in that the first lens cannot bear excessive power, it is necessary to focus on the relationship between the outer diameter D1s of the object-side surface of the first spacing element and the thickness of the edge structure of the second lens, which satisfies -11.50<f1 / D1s<-4.60, ensuring that the outer diameter D1s of the object-side surface of the first spacing element is sufficiently stable, so as to prevent the change of the air gap caused by the difference in thermal expansion between the edge thickness of the lens and D1s in a high-temperature environment. Meanwhile, it is constrained that 3.40<(D1s-d1s) / EP12<6.75, which avoids the situation that the front and rear承接 transition is unreasonable due to the influence of the arrangement position of the second lens. Specifically, by reasonably controlling the outer diameter D1s of the object-side surface of the first spacing element and the thickness of the edge structure of the second lens, the outer diameter D1s of the object-side surface of the first spacing element is conducive to dispersing the pressure of the first lens along the optical axis direction, while the reasonable thickness of the edge structure of the second lens can ensure that the bearing position of the second lens can withstand the pressure perpendicular to the optical axis direction, so that the second lens can maintain good structural stability during the assembly process and the high-temperature and high-humidity reliability verification process, balances the cumulative amount of the self-deformation of the second lens and the stress caused by the expansion of the lens barrel, improves the assembly stability of the second lens, and further improves the overall assembly stability of the optical imaging apparatus. Description of Drawings

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 A schematic diagram showing the dimensions of an optical imaging device according to an alternative embodiment of the present invention is provided.

[0024] Figure 2 A schematic diagram of the structure of the optical imaging device according to Embodiment 1 of the present invention is shown;

[0025] Figure 3 A schematic diagram of the optical imaging device according to Embodiment 2 of the present invention is shown;

[0026] Figure 4 A schematic diagram of the optical imaging device according to Embodiment 3 of the present invention is shown;

[0027] Figures 5 to 8 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging device of Embodiment 1 are shown respectively.

[0028] Figure 9 A schematic diagram of the optical imaging device according to Embodiment 4 of the present invention is shown;

[0029] Figure 10 A schematic diagram of the structure of the optical imaging device according to Embodiment 5 of the present invention is shown;

[0030] Figure 11 A schematic diagram of the structure of the optical imaging device according to Embodiment Six of the present invention is shown;

[0031] Figures 12 to 15 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging device of Embodiment 4 are shown respectively.

[0032] Figure 16 A schematic diagram of the structure of the optical imaging device according to Embodiment 7 of the present invention is shown;

[0033] Figure 17 A schematic diagram of the structure of the optical imaging device according to Embodiment 8 of the present invention is shown;

[0034] Figure 18 A schematic diagram of the structure of the optical imaging device according to Embodiment 9 of the present invention is shown;

[0035] Figures 19 to 22 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging device of Embodiment 7 are shown respectively.

[0036] Figure 23The stress diagram of the optical imaging device of Embodiment 2 of the present invention is shown when f1 / (R1+R2)=-4.12, f1 / D1s=-5.89 and (D1s-d1s) / EP12=6.05 under high temperature and high humidity conditions;

[0037] Figure 24 The stress diagram of the optical imaging device of Comparative Example 1 is shown when it satisfies f1 / (R1+R2)=-4.12, f1 / D1s=-5.89 and (D1s-d1s) / EP12=3.01 under high temperature and high humidity conditions;

[0038] Figure 25 The stress diagram of the optical imaging device of Comparative Example 2 is shown when it satisfies f1 / (R1+R2)=-4.12, f1 / D1s=-5.89 and (D1s-d1s) / EP12=7.91 under high temperature and high humidity conditions.

[0039] The above figures include the following reference numerals:

[0040] P0, Lens tube; E1, First lens; P1, First spacer element; E2, Second lens; P2, Second spacer element; E3, Third lens; P3, Third spacer element; E4, Fourth lens; P4, Fourth spacer element; E5, Fifth lens; P5, Fifth spacer element; E6, Sixth lens; P6, Sixth spacer element; E7, Seventh lens; S1, Object side surface of the first lens;

[0041] S2, image-side surface of the first lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; S11, object-side surface of the sixth lens; S12, image-side surface of the sixth lens; S13, object-side surface of the seventh lens; S14, image-side surface of the seventh lens. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0044] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0045] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0046] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0047] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of that convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of that concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine convexity or concavity. For the object side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0048] In this application, the object side refers to the side of the optical imaging device facing the object being photographed (not shown in the figure), and the image side refers to the side of the optical imaging device facing the imaging plane (not shown in the figure). hereinafter, the object side of a lens refers to the surface of the lens facing the object being photographed (not shown in the figure), and the image side of a lens refers to the surface of the lens facing the imaging plane (not shown in the figure). In the structural schematic diagram shown in this application, the left side is the object side, and the right side is the image side.

[0049] To address the problem that existing seven-element optical imaging devices suffer from limitations in controlling the effective focal length and radius of curvature of the front-end lens, which restricts the size of the front-end structure and easily leads to deformation and stress concentration during lens assembly, resulting in poor assembly stability, this invention provides an optical imaging device.

[0050] like Figures 1 to 23As shown, in an alternative embodiment of the present application, the optical imaging apparatus includes a lens barrel, a lens group disposed in the lens barrel and a plurality of spacing elements. The lens group consists of seven lenses, and the seven lenses are sequentially arranged along the optical axis of the optical imaging apparatus from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens; there is an air gap between every two adjacent lenses from the first lens to the seventh lens; the first lens has negative optical power, the object-side surface of the first lens is a convex surface, and the image-side surface of the first lens is a concave surface; the plurality of spacing elements include a first spacing element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens, and a second spacing element disposed between the second lens and the third lens and in contact with the image-side surface of the second lens; the effective focal length f1 of the first lens, the curvature radius R1 of the object-side surface of the first lens and the curvature radius R2 of the image-side surface of the first lens satisfy: -4.15 < f1 / (R1+R2) < -1.00; the effective focal length f1 of the first lens and the outer diameter D1s of the object-side surface of the first spacing element satisfy: -11.50 < f1 / D1s < -4.60; the outer diameter D1s of the object-side surface of the first spacing element, the inner diameter d1s of the object-side surface of the first spacing element and the spacing distance EP12 on the optical axis from the image-side surface of the first spacing element to the object-side surface of the second spacing element satisfy: 3.40 < (D1s-d1s) / EP12 < 6.75.

[0051] The optical imaging apparatus of the present application configures the first lens to have negative power, the object-side surface of the first lens is a convex surface, and the image-side surface of the first lens is a concave surface, wherein the basic parameters of the first lens satisfy -4.15 < f1 / (R1+R2) < -1.00. Considering that temperature drift will affect the deformation of the first lens, so that the first lens cannot bear excessive power, it is necessary to focus on the relationship between the outer diameter D1s of the object-side surface of the first spacer element and the thickness of the edge structure of the second lens, which satisfies -11.50 < f1 / D1s < -4.60, to ensure that the outer diameter D1s of the object-side surface of the first spacer element is sufficiently stable, so as to prevent the change of air gap caused by the difference in thermal expansion between the edge thickness of the lens and D1s in a high temperature environment. Meanwhile, the condition 3.40 < (D1s-d1s) / EP12 < 6.75 is constrained, which avoids the problem of unreasonable front and rear connecting transition of the second lens caused by the influence of the arrangement position. Specifically, by reasonably controlling the outer diameter D1s of the object-side surface of the first spacer element and the thickness of the edge structure of the second lens, the outer diameter D1s of the object-side surface of the first spacer element is conducive to dispersing the pressure of the first lens along the optical axis direction, while the reasonable thickness of the edge structure of the second lens can ensure that the bearing position of the second lens can withstand the pressure perpendicular to the optical axis direction, so that the second lens can maintain good structural stability during the assembly process and the high temperature and high humidity reliability verification process, balance the cumulative amount of self-deformation of the second lens and the stress caused by the expansion of the lens barrel, improve the assembly stability of the second lens, and thereby improve the overall assembly stability of the optical imaging apparatus.

[0052] It should be noted that the above-mentioned stress concentration refers to a phenomenon in which the stress level in a local area of a structural member, such as a local area of a lens, is significantly higher than the average stress due to the discontinuity of shape or material properties. Specifically, it means that stress concentration points are easily formed at the joints between the lens and the lens barrel or other components. Long-term stress concentration will accelerate material fatigue and reduce the structural stability of lens assembly, thereby affecting the quality of optical imaging and the service life of the device. Especially under temperature changes, vibrations or external impacts, the displacement and deformation of the lens will be more obvious, which may cause problems such as blurred and distorted images, and even lead to lens dislocation or damage in severe cases.

[0053] In addition, with reference to Figures 23 to 25 shown, under the premise that the optical imaging apparatus is in a high temperature and high humidity state and satisfies -4.15 < f1 / (R1+R2) < -1.00, for example, f1 / (R1+R2) = -4.12, Figure 23 shows a stress diagram of the optical imaging apparatus according to Embodiment 2 of the present application when f1 / D1s = -5.89 and (D1s-d1s) / EP12 = 6.05 in the high temperature and high humidity state, Figure 24The stress diagram of the optical imaging device of Comparative Example 1 is shown when f1 / D1s = -5.89 and (D1s-d1s) / EP12 = 3.01 under this high temperature and high humidity condition. Figure 25 The stress diagram of the optical imaging device of Comparative Example 2 is shown when f1 / D1s = -5.89 and (D1s-d1s) / EP12 = 7.91 are satisfied under this high temperature and high humidity condition. The high temperature and high humidity condition mentioned here specifically refers to the situation where the ambient temperature is constant at 85°C and the ambient relative humidity is 85%.

[0054] Depend on Figures 23 to 25 It can be seen that when the optical imaging device satisfies f1 / (R1+R2)=-4.12, f1 / D1s=-5.89, and (D1s-d1s) / EP12=6.05, the maximum stress on the second lens when it expands and deforms due to high temperature and high humidity conditions is 5.8887MPa. The stress is relatively small, and the assembly stability is good. When the optical imaging device satisfies f1 / (R1+R2)=-4.12, f1 / D1s=-5.89, and (D1s-d1s) / EP12=3.01, the thickness of the edge structure of the second lens increases, and the overall stress it experiences is close to that of Embodiment 2 of this application. However, there is a large inflection point in the transition area between the center effective diameter portion and the edge non-effective diameter portion of the second lens. A large inflection point of the lens is prone to stress concentration under high temperature and high humidity conditions, resulting in a significant increase in local stress. This leads to a large accumulation of deformation of the second lens under high temperature and high humidity conditions, and an increase in stress on the inner wall of the lens barrel when compressed. The maximum stress experienced by the second lens is 16.39MPa. The stress at the inflection point is relatively large, thus increasing the risk of cracking of the second lens during the assembly process and resulting in poor assembly stability. When the optical imaging device satisfies f1 / (R1+R2)=-4.12, f1 / D1s=-5.89, and (D1s-d1s) / EP12=7.91, the thickness of the edge structure of the second lens decreases. Although its cumulative deformation will theoretically decrease, the second lens is more susceptible to deformation due to the expansion of the lens barrel under high temperature and high humidity conditions. The second lens is more likely to be squeezed inward by the lens barrel. The maximum stress on the second lens is 19.516MPa, which is relatively large and results in poor assembly stability.

[0055] As shown in Table 1, Table 1 shows the amount of field curvature change caused by the change of the air gap between the first lens and the second lens under different fields of view for the optical imaging apparatuses of Example 2 of the present application, Comparative Example 1 and Comparative Example 2 under high temperature and high humidity conditions, the unit is micrometer (um). Under high temperature and high humidity conditions, the lenses will deform under the influence of temperature and humidity, which causes the change of the air gap between the lenses, and further leads to field curvature offset. It can be seen from the following table that the field curvature offset of the optical imaging apparatus in Example 2 of the present application at 0.95F field of view is 10.8573 um, and the change amount of field curvature performance is small. In Comparative Example 1, the edge thickness of the second lens of the optical imaging apparatus is increased, and the thickness further increases under the expansion condition of high temperature and high humidity, resulting in a more positive field curvature. Compared with the example of the present application, Comparative Example 1 has a more positive field curvature, and the field curvature offset at 0.95F field of view is 12.1823 um at this time. In Comparative Example 2, the edge thickness of the second lens of the optical imaging apparatus is decreased, the lens expands under high temperature and high humidity conditions, and the deformation amount squeezed by the lens barrel increases, resulting in a significant increase in the change amount of field curvature, and the field curvature offset at 0.95F field of view is 25.0008 um. It can be seen that when the optical imaging apparatus satisfies -4.15<f1 / (R1+R2)<-1.00, -11.50<f1 / D1s<-4.60 and controls (D1s-d1s) / EP12 within the range of 3.40 to 6.75, the amount of field curvature change caused by the change of the air gap between lenses under high temperature and high humidity conditions is small, and the overall stability is good.

[0056] Table 1

[0057]

[0058]

[0059] In this embodiment, the plurality of spacer elements further include a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens.

[0060] In this embodiment, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens satisfy: 1.25<(R5+R6) / (R5-R6)<1.80; the combined focal length f23 of the second lens and the third lens and the distance EP23 on the optical axis from the image-side surface of the second spacer element to the object-side surface of the third spacer element satisfy: 24.45<f23 / EP23<86.20. By restricting the curvature radii of the object-side surface and the image-side surface of the third lens, the surface shape reliability of the third lens is ensured, the third lens is guaranteed to meet the requirements of stability and imaging during design, and problems such as increased imaging distortion and aberration caused by the curvature radius of the surface of the third lens are reduced. By restricting f23 / EP23, while maintaining the compactness of the optical imaging device, it can ensure that the optical imaging device has sufficient back focal length to accommodate a sensor or other imaging elements.

[0061] In this embodiment, the combined focal length f34 of the third lens and the fourth lens and the distance EP34 on the optical axis from the image-side surface of the third spacer element to the object-side surface of the fourth spacer element satisfy: 15.05<f34 / EP34<26.30. Restricting this conditional expression can ensure that the third lens and the fourth lens maintain certain stability and performance during the design and manufacturing process. Controlling the ratio of the combined focal length of the third lens and the fourth lens to the spacing distance between the spacer elements on their image side can improve imaging quality and reduce image distortion, blurring or other imaging problems caused by an excessively large or too small ratio, and can affect the compactness and stability of the entire lens group to a certain extent.

[0062] In this embodiment, the combined focal length f45 of the fourth lens and the fifth lens and the distance EP45 on the optical axis from the image-side surface of the fourth spacer element to the object-side surface of the fifth spacer element satisfy: 7.05<f45 / EP45<8.05. Restricting this conditional expression is beneficial to ensuring the accuracy and consistency of the fourth lens and the fifth lens during manufacturing and assembly, helps reduce spherical aberration, coma and field curvature of the fourth lens and the fifth lens, so as to obtain clear images; on the premise of meeting performance requirements, it reduces manufacturing costs and makes the lens group more compact.

[0063] In this embodiment, the distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element on the optical axis satisfies the following relationship with the on-axis displacement SAG42 between the intersection point of the image side surface of the fourth lens and the optical axis and the effective radius vertex of the image side surface of the fourth lens: 1.25<EP34 / |SAG42|<1.50. Constraining this conditional expression is beneficial to improving the accuracy and consistency of the assembly process of the third spacer element, the fourth lens, and the fourth spacer element. Optimizing this ratio can further improve imaging quality. An appropriate ratio of EP34 to SAG42 helps to reduce aberrations, especially aberrations related to the surface shape of the lens, such as spherical aberration and coma. At the same time, while ensuring imaging quality and performance, the size of the fourth lens is controlled so that it does not exceed the distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element on the optical axis, which makes the structural arrangement more compact and the overall structure more stable.

[0064] In this embodiment, the effective focal length f5 of the fifth lens and the outer diameter D5s of the object side surface of the fifth spacer element satisfy: 6.05<|f5| / D5s<11.15. Controlling this conditional expression facilitates aberration correction, including spherical aberration, coma, field curvature, etc., and optimizes the light converging capability of the fifth lens. Adjusting the outer diameter of the object side surface of the fifth spacer element affects the passing aperture of light passing through the lens group at the fifth spacer element and the overall size, thereby improving imaging quality. By controlling this ratio, the light tracing path can be optimized, reducing the loss and distortion of light during transmission, which helps ensure that the optical imaging device can obtain clear images under various light conditions.

[0065] In this embodiment, the air interval T56 between the fifth lens and the sixth lens on the optical axis, the air interval T67 between the sixth lens and the seventh lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the distance EP56 between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element on the optical axis satisfy: 1.85<(T56+CT6+T67) / EP56<2.10.

[0066] Constraining this conditional expression helps optimize the space occupation before and after the sixth lens and between adjacent lenses, which can make the arrangement of various structures in the lens barrel more compact while ensuring imaging quality. Appropriate air intervals between adjacent lenses and the center thickness of the lens can help reduce aberrations such as spherical aberration, coma, and field curvature. Optimizing the air gap between the fifth lens and the sixth lens, as well as the center thickness and edge thickness of the sixth lens, makes the tracing path of light in the optical imaging device more reasonable, ensures the correct propagation of light in the optical imaging device, and reduces distortion.

[0067] In this embodiment, the on-optical-axis spacing EP56 between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element, and the on-axis sag SAG52 between the intersection of the image-side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image-side surface of the fifth lens satisfy: 3.10<EP56 / |SAG52|<4.15. Strict control of this ratio can ensure the accuracy and consistency of the fifth lens, the fifth spacer element and the sixth spacer element during assembly. Meanwhile, it can further improve imaging quality. It also contributes to reducing aberrations, especially aberrations related to the surface shape of lenses, such as spherical aberration and coma. Meanwhile, under the condition of ensuring imaging quality without performance degradation, the size of the fifth lens is controlled not to exceed the on-optical-axis spacing from the image-side surface of the fifth spacer element to the object-side surface of the sixth spacer element, making the optical imaging device more compact.

[0068] In this embodiment, the outer diameter D0s of the object-side surface of the lens barrel, the outer diameter D0m of the image-side surface of the lens barrel, and the effective focal length f of the optical imaging device satisfy: 0.70<(D0m-D0s) / f<0.85. Restricting this relational expression helps to ensure that the size of the lens barrel and the effective focal length of the optical imaging device maintain a reasonable ratio, which helps avoid the situation where the outer shape of the lens barrel is too large or too small, thereby affecting the overall performance and assembly accuracy. Reasonable size design of the lens barrel can reduce aberrations, such as spherical aberration, coma, etc., thereby improving the clarity and resolution of imaging to achieve better imaging effects. As an important component for supporting and protecting lenses and spacer elements, reasonable size design of the lens barrel can also improve the stability of the system, simplify the assembly process, reduce the difficulty of debugging, thereby improving production efficiency and product quality.

[0069] In this embodiment, the inner diameter d0s of the object-side surface of the lens barrel, the inner diameter d0m of the image-side surface of the lens barrel, and the on-axis distance TD from the object-side surface of the first lens to the image-side surface of the seventh lens satisfy: 1.05<(d0m-d0s) / TD<1.35. Restricting this conditional expression is conducive to optimizing optical path design, can reduce light loss and aberrations, and improve the imaging clarity and resolution of the optical imaging device. The difference between the inner diameter of the object-side surface of the lens barrel and the inner diameter of the image-side surface of the lens barrel will affect the aberration of the optical imaging device. By adjusting this ratio, aberration can be controlled to a certain extent and imaging quality can be improved. Controlling TD can make the structural arrangement of the optical imaging device more compact under the premise of ensuring imaging quality.

[0070] In this embodiment, the curvature radius R2 of the image side surface of the first lens, the curvature radius R5 of the object side surface of the third lens, the inner diameter d2s of the object side surface of the second spacer element and the inner diameter d1m of the image side surface of the first spacer element satisfy: 3.05<(R5×d2s) / (R2×d1m)<6.15. Constraining this conditional expression is beneficial for optimizing the trend of the optical path between the first lens and the third lens, making the propagation of light in the optical imaging apparatus more reasonable, which helps reduce light loss and aberration, thereby improving the clarity and resolution of imaging. By changing the curvature radius of lenses and the inner diameter of spacer elements, optical imaging apparatuses with different focal lengths, field angles and magnifications can be designed, which improves design flexibility.

[0071] In this embodiment, the curvature radius R11 of the object side surface of the sixth lens, the refractive index N6 of the sixth lens, the outer diameter D6s of the object side surface of the sixth spacer element and the inner diameter d6s of the object side surface of the sixth spacer element satisfy: 2.55<R11×N6 / (D6s-d6s)<3.70. By controlling R11 of the sixth lens and N6 of the sixth lens, the imaging quality is optimized and aberration is reduced. The refractive index N6 determines the refraction degree of light when it passes through the sixth lens. The curvature radius R11 affects the refraction and focusing of light on the object side surface of the sixth lens. By adjusting these two parameters, the propagation path of light in the system can be controlled, thereby optimizing the imaging effect.

[0072] In this embodiment, the inner diameter d5s of the object side surface of the fifth spacer element, the outer diameter D5s of the object side surface of the fifth spacer element and the effective radius DT52 of the image side surface of the fifth lens satisfy: 0.95<(D5s-d5s) / DT52<1.35. By controlling the difference between the outer diameter and the inner diameter of the object side surface of the fifth spacer element, it is beneficial to the refraction and reflection of light at the fifth spacer element, which avoids the increase of stray light on the basis of ensuring the stable passage of light and improves the imaging quality. At the same time, constraining this conditional expression is also beneficial for controlling spherical aberration, coma, astigmatism, etc., and improves the clarity and resolution of imaging.

[0073] In this embodiment, the central thickness CT3 of the third lens on the optical axis and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 1.50<CT3 / T34<2.80; the inner diameter d3s of the object side surface of the third spacing element and the radial distance Yc32 from the inflection point far away from the optical axis on the image side surface of the effective diameter portion of the third lens to the optical axis satisfy: 3.15<d3s / Yc32<3.80. Controlling the two conditional expressions is conducive to optimizing the light trend and realizing aberration correction. The inner diameter of the object side surface of the third spacing element affects the diffusion degree of light when passing through the third spacing element. Adjusting d3s can optimize the propagation path of light, thereby reducing aberrations. A proper Yc32 means that the third lens can provide good imaging quality even at the edge of the effective diameter portion, which helps reduce edge aberrations. In addition, such arrangement can also balance the reliability stability and the compactness of structural arrangement to a certain extent.

[0074] It should be noted that any one of the above first lens to seventh lens is composed of an effective diameter portion and an edge structure. The edge structure is annular and connected to the outer peripheral side of the effective diameter portion. The effective diameter portion is for imaging light to pass through and participates in imaging; while the edge structure is not for imaging light to pass through, does not participate in imaging, and is used for contact with adjacent spacing elements, adjacent lenses or the lens barrel.

[0075] In this embodiment, the second lens has positive power, the object side surface of the second lens is concave, and the image side surface of the second lens is convex; the third lens has negative power, the object side surface of the third lens is convex, and the image side surface of the third lens is concave; the fourth lens has positive power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex; the sixth lens has positive power, and the object side surface of the sixth lens is convex; the seventh lens has negative power, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave. Reasonably planning the power and surface shape of each lens is conducive to regulating the trend of light passing through each lens, improving the stability of light transmission, optimizing aberrations and distortions, and ensuring imaging quality.

[0076] In addition, in another optional embodiment of the present application, there is further provided an optical imaging apparatus, comprising a lens barrel, a lens group disposed in the lens barrel, and a plurality of spacer elements. The lens group consists of seven lenses, and the seven lenses are sequentially arranged along the optical axis of the optical imaging apparatus from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; there is an air gap between every two adjacent lenses among the first lens to the seventh lens; the first lens has negative optical power, the object-side surface of the first lens is a convex surface, and the image-side surface of the first lens is a concave surface; the plurality of spacer elements comprise a first spacer element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image-side surface of the second lens; the effective focal length f1 of the first lens, the curvature radius R1 of the object-side surface of the first lens, and the curvature radius R2 of the image-side surface of the first lens satisfy: -4.15 < f1 / (R1+R2) < -1.00; the curvature radius R2 of the image-side surface of the first lens, the curvature radius R5 of the object-side surface of the third lens, the inner diameter d2s of the object-side surface of the second spacer element, and the inner diameter d1m of the image-side surface of the first spacer element satisfy: 3.05 < (R5×d2s) / (R2×d1m) < 6.15.

[0077] In the optical imaging apparatus of the present application, by configuring that the first lens has negative optical power, the object-side surface of the first lens is a convex surface, the image-side surface of the first lens is a concave surface, and the condition -4.15 < f1 / (R1+R2) < -1.00 is satisfied, it can be seen that the sum of the curvature radius of the object-side surface of the first lens and the curvature radius of the image-side surface of the first lens is relatively large, which easily causes light loss when the front-end lens transmits light. By constraining 3.05 < (R5×d2s) / (R2×d1m) < 6.15, it is beneficial to optimize the propagation path of the optical path between the first lens and the third lens, so that the propagation of light in the optical imaging apparatus is more reasonable, which helps reduce light loss and aberration, thereby improving the clarity and resolution of imaging. By changing the curvature radii of the lenses and the inner diameters of the spacer elements, optical imaging apparatuses with different focal lengths, field of view angles and magnifications can be designed, which improves design flexibility.

[0078] Of course, the present embodiment may also include other parametric formulae in the above embodiments, which will not be repeated one by one herein.

[0079] Optionally, the above optical imaging apparatus may further comprise a protective glass for protecting the photosensitive element located on the imaging surface.

[0080] The optical imaging device in this application may employ multiple lenses, such as the seven lenses described above. In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0081] However, those skilled in the art will understand that the number of lenses constituting the optical imaging device can be changed without departing from the technical solutions claimed in this application to obtain the various results and advantages described in this specification. For example, although seven lenses have been described as an example in the embodiments, the optical imaging device is not limited to including seven lenses. If necessary, the optical imaging device may also include other numbers of lenses.

[0082] Figure 1 A schematic diagram showing the dimensions of an optical imaging device according to an alternative embodiment of this application is provided. Figure 1 The parameters D0s, D1s, d0s, d3s, d1m, d2s, d1s, Yc32, DT52, d5s, d6s, D5s, D6s, d0m, D0m, SAG42, SAG52, EP12, EP23, EP34, EP45, and EP56 are clearly and intuitively illustrated to provide a clear understanding of their meaning. To facilitate the description of the optical imaging device and the specific lens shape, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0083] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of the optical imaging apparatus applicable to the above embodiments.

[0084] It should be noted that any one of the following embodiments, from Embodiment 1 to Embodiment 9, is applicable to all implementation methods of this application.

[0085] Example 1

[0086] like Figure 2 , Figures 5 to 8 As shown, the optical imaging device of Embodiment 1 is described. Figure 2 A schematic diagram of the optical imaging device of Embodiment 1 is shown.

[0087] like Figure 2As shown, the optical imaging device includes a lens barrel P0 and the following elements arranged sequentially from the object side to the image side along the optical axis of the lens barrel P0: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7.

[0088] like Figure 2 As shown, the object-side and image-side surfaces of the first spacer element P1 are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side and image-side surfaces of the second spacer element P2 are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer element P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side and image-side surfaces of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side and image-side surfaces of the fifth spacer element P5 are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side and image-side surfaces of the sixth spacer element P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively.

[0089] In summary, the data for the optical imaging device in Embodiment 1 are shown in Table 2, with units in millimeters (mm).

[0090] Table 2

[0091] d1s 2.0705 d1m 2.0705 D1s 3.8701 d2s 2.0460 d3s 2.5406 d5s 3.2705 D5s 5.3844 d6s 4.5417 D6s 6.5101 d0s 2.8016 d0m 7.6519 D0s 5.1577 D0m 8.0000 EP12 0.2674 EP23 0.4151 EP34 0.5184 EP45 0.5008 EP56 0.6370

[0092] In Embodiment 1, the first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has positive optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens E3 has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fifth lens E5 has positive optical power, its object-side surface S9 is concave, and its image-side surface S10 is convex. The sixth lens E6 has positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is convex. The seventh lens E7 has negative optical power, its object-side surface S13 is convex, and its image-side surface S14 is concave.

[0093] In Embodiment 1, the effective focal length f of the optical imaging device is 3.74 mm, the effective focal length f1 of the first lens is -23.16 mm, the effective focal length f2 of the second lens is 3.97 mm, the effective focal length f3 of the third lens is -6.13 mm, the effective focal length f4 of the fourth lens is 4.40 mm, the effective focal length f5 of the fifth lens is 33.04 mm, the effective focal length f6 of the sixth lens is 6.64 mm, and the effective focal length f7 of the seventh lens is -2.49 mm.

[0094] Table 3 shows the basic structural parameters of the optical imaging device in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, which is located on the object side of the first lens E1.

[0095] Table 3

[0096]

[0097] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the seventh lens E7 are both aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0098]

[0099] Where x is the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, and A26 that can be used for each aspherical mirror S1-S14 in Example 1.

[0100] Table 4

[0101] S1 -1.6523E-01 -4.7883E-02 -5.5798E-02 -6.8973E-01 4.6164E+00 -1.1563E+01 S2 -1.1210E-01 3.2231E-03 -5.0641E-01 2.6780E+00 -9.7766E+00 2.2224E+01 S3 4.5868E-02 1.5673E-01 -1.2338E+00 6.0763E+00 -2.0487E+01 4.1392E+01 S4 1.3146E-01 -3.7159E-01 1.7412E-01 1.2723E+00 -3.9117E+00 5.3582E+00 S5 -8.2416E-03 -3.1480E-02 -1.1415E+00 3.9716E+00 -7.5774E+00 9.0943E+00 S6 -4.9949E-02 1.6018E-01 -8.8568E-01 1.6463E+00 -1.8016E+00 1.3018E+00 S7 -2.6038E-01 6.5248E-01 -1.2621E+00 1.6072E+00 -1.2548E+00 5.5100E-01 S8 -6.1145E-02 -4.0623E-02 3.0077E-01 -6.6436E-01 8.9271E-01 -7.3626E-01 S9 1.4626E-01 -4.4697E-01 9.2357E-01 -1.2745E+00 1.1611E+00 -6.9019E-01 S10 2.3270E-01 -8.6478E-01 1.6112E+00 -1.9398E+00 1.5519E+00 -8.2048E-01 S11 3.3663E-01 -7.8334E-01 9.4283E-01 -7.6234E-01 4.0975E-01 -1.4324E-01 S12 2.8809E-01 -4.1432E-01 2.3783E-01 5.4728E-02 -1.9993E-01 1.6116E-01 S13 -5.6544E-01 4.7888E-01 -3.3444E-01 1.8839E-01 -7.2280E-02 1.7930E-02 S14 -2.3382E-01 1.8442E-01 -1.0023E-01 3.8735E-02 -1.0599E-02 1.9973E-03 Face number A16 A18 A20 A22 A24 A26 S1 1.5214E+01 -1.0383E+01 2.8866E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -2.9672E+01 2.1668E+01 -6.6534E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -4.9085E+01 3.1969E+01 -8.8199E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -3.7366E+00 1.0721E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 -6.7569E+00 2.8412E+00 -5.1483E-01 0.0000E+00 0.0000E+00 0.0000E+00 S6 -6.3625E-01 1.9930E-01 -3.0283E-02 0.0000E+00 0.0000E+00 0.0000E+00 S7 -1.0976E-01 3.1636E-04 2.1117E-03 0.0000E+00 0.0000E+00 0.0000E+00 S8 3.5620E-01 -9.3408E-02 1.0414E-02 0.0000E+00 0.0000E+00 0.0000E+00 S9 2.5564E-01 -5.2894E-02 4.6088E-03 0.0000E+00 0.0000E+00 0.0000E+00 S10 2.7526E-01 -5.2661E-02 4.3332E-03 0.0000E+00 0.0000E+00 0.0000E+00 S11 2.9123E-02 -2.5470E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -7.4087E-02 2.2154E-02 -4.4356E-03 5.7919E-04 -4.4798E-05 1.5573E-06 S13 -2.8308E-03 2.7474E-04 -1.4939E-05 3.4822E-07 0.0000E+00 0.0000E+00 S14 -2.4952E-04 1.9579E-05 -8.7007E-07 1.6664E-08 0.0000E+00 0.0000E+00

[0102] Figure 5 The on-axis chromatic aberration curve of the optical imaging device of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 6 The astigmatism curves of the optical imaging device of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7 The distortion curve of the optical imaging device of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 8 The magnification chromatic aberration curve of the optical imaging device of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the optical imaging device.

[0103] according to Figures 5 to 8 As can be seen, the optical imaging device given in Example 1 can achieve good imaging quality.

[0104] Example 2

[0105] like Figure 3 As shown, a schematic diagram of the optical imaging device of Embodiment 2 is presented.

[0106] like Figure 3 As shown, the optical imaging device includes a lens barrel P0 and the following elements arranged sequentially from the object side to the image side along the optical axis of the lens barrel P0: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7.

[0107] like Figure 3 As shown, the object-side and image-side surfaces of the first spacer element P1 are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side and image-side surfaces of the second spacer element P2 are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer element P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side and image-side surfaces of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side and image-side surfaces of the fifth spacer element P5 are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side and image-side surfaces of the sixth spacer element P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively.

[0108] In Embodiment 2, the radii of curvature, center thickness, focal length, and other parameters of the first to seventh lenses of the optical imaging device, as well as the spacing between the lenses and the higher-order coefficients, are the same as in Embodiment 1. However, the thickness, inner diameter, and outer diameter of the lens barrel, the first spacer element, and the sixth spacer element are different from those in Embodiment 1. Therefore, the basic structural parameter table of the optical imaging device and the higher-order coefficients of each aspherical surface can be found in Embodiment 1.

[0109] In summary, the data for the optical imaging device in Embodiment 2 are shown in Table 5, with units in millimeters (mm).

[0110] Table 5

[0111] d1s 2.1305 d1m 2.1305 D1s 3.9301 d2s 2.0895 d3s 2.5783 d5s 3.3105 D5s 5.4244 d6s 4.4683 D6s 6.5501 d0s 2.8016 d0m 7.6519 D0s 5.1577 D0m 8.0000 EP12 0.2974 EP23 0.4151 EP34 0.5084 EP45 0.5008 EP56 0.6074

[0112] Example 3

[0113] like Figure 4 As shown, a schematic diagram of the optical imaging device of Embodiment 3 is presented.

[0114] like Figure 4 As shown, the optical imaging device includes a lens barrel P0 and the following elements arranged sequentially from the object side to the image side along the optical axis of the lens barrel P0: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7.

[0115] like Figure 4 As shown, the object-side and image-side surfaces of the first spacer element P1 are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side and image-side surfaces of the second spacer element P2 are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer element P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side and image-side surfaces of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side and image-side surfaces of the fifth spacer element P5 are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side and image-side surfaces of the sixth spacer element P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively.

[0116] In Embodiment 3, the radii of curvature, center thickness, focal length, and other parameters of the first to seventh lenses of the optical imaging device, as well as the spacing between the lenses and the higher-order coefficients, are the same as in Embodiment 1. However, the thickness, inner diameter, and outer diameter of the lens barrel, the first spacer element, and the sixth spacer element are different from those in Embodiment 1. Therefore, the basic structural parameter table of the optical imaging device and the higher-order coefficients of each aspherical surface can be found in Embodiment 1.

[0117] In summary, the data for the optical imaging device in Embodiment 3 are shown in Table 6, with units in millimeters (mm).

[0118] Table 6

[0119] d1s 2.0625 d1m 2.0625 D1s 3.2342 d2s 2.0183 d3s 2.4985 d5s 3.2905 D5s 5.4044 d6s 4.5617 D6s 6.5301 d0s 2.8016 d0m 7.6519 D0s 5.1577 D0m 8.0000 EP12 0.2484 EP23 0.3881 EP34 0.5654 EP45 0.5008 EP56 0.6374

[0120] Example 4

[0121] like Figure 9 , Figures 12 to 15 As shown, the optical imaging device of Embodiment 4 is described. Figure 9 A schematic diagram of the optical imaging device of Embodiment 4 is shown.

[0122] like Figure 9 As shown, the optical imaging device includes a lens barrel P0 and the following elements arranged sequentially from the object side to the image side along the optical axis of the lens barrel P0: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7.

[0123] like Figure 9 As shown, the object-side and image-side surfaces of the first spacer element P1 are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side and image-side surfaces of the second spacer element P2 are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer element P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side and image-side surfaces of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side and image-side surfaces of the fifth spacer element P5 are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side and image-side surfaces of the sixth spacer element P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively.

[0124] In summary, the data for the optical imaging device in Embodiment 4 are shown in Table 7, with units in millimeters (mm).

[0125] Table 7

[0126] d1s 1.9705 d1m 1.9705 D1s 3.9000 d2s 2.1380 d3s 2.6276 d5s 3.4723 D5s 5.5602 d6s 4.5554 D6s 6.6000 d0s 2.7617 d0m 7.7888 D0s 5.1256 D0m 8.1546 EP12 0.3029 EP23 0.393 EP34 0.5656 EP45 0.5465 EP56 0.6491

[0127] In Embodiment 4, the first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has positive optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens E3 has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fifth lens E5 has positive optical power, its object-side surface S9 is concave, and its image-side surface S10 is convex. The sixth lens E6 has positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The seventh lens E7 has negative optical power, its object-side surface S13 is convex, and its image-side surface S14 is concave.

[0128] In Embodiment 4, the effective focal length f of the optical imaging device is 3.79 mm, the effective focal length f1 of the first lens is -18.13 mm, the effective focal length f2 of the second lens is 4.64 mm, the effective focal length f3 of the third lens is -7.10 mm, the effective focal length f4 of the fourth lens is 4.04 mm, the effective focal length f5 of the fifth lens is 61.32 mm, the effective focal length f6 of the sixth lens is 6.81 mm, and the effective focal length f7 of the seventh lens is -2.60 mm.

[0129] Table 8 shows the basic structural parameters of the optical imaging device in Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, which is located on the object side of the first lens E1.

[0130] Table 8

[0131]

[0132] Table 9 shows the higher-order coefficients that can be used for each aspherical surface in Example 4, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0133] Table 9

[0134]

[0135]

[0136] Figure 12 The on-axis chromatic aberration curve of the optical imaging device of Embodiment 4 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 13 The astigmatism curves of the optical imaging device of Embodiment 4 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 14 The distortion curves of the optical imaging device of Embodiment 4 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 15 The magnification chromatic aberration curve of the optical imaging device of Embodiment 4 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the optical imaging device.

[0137] according to Figures 12 to 15 It can be seen that the optical imaging device given in Example 4 can achieve good imaging quality.

[0138] Example 5

[0139] like Figure 10 As shown, a schematic diagram of the optical imaging device of Embodiment 5 is presented.

[0140] like Figure 10As shown, the optical imaging device includes a lens barrel P0 and the following elements arranged sequentially from the object side to the image side along the optical axis of the lens barrel P0: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7.

[0141] like Figure 10 As shown, the object-side and image-side surfaces of the first spacer element P1 are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side and image-side surfaces of the second spacer element P2 are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer element P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side and image-side surfaces of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side and image-side surfaces of the fifth spacer element P5 are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side and image-side surfaces of the sixth spacer element P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively.

[0142] In Embodiment 5, the radii of curvature, center thickness, focal length, and other parameters of the first to seventh lenses of the optical imaging device, as well as the spacing between the lenses and the higher-order coefficients, are the same as in Embodiment 4. However, the thickness, inner diameter, and outer diameter of the lens barrel, the first spacer element, and the sixth spacer element are different from those in Embodiment 4. Therefore, the basic structural parameter table of the optical imaging device and the higher-order coefficients of each aspherical surface can be found in Embodiment 4.

[0143] In summary, the parameters of the optical imaging device in Embodiment 5 are shown in Table 10, with the unit being millimeters (mm).

[0144] Table 10

[0145] d1s 1.9288 d1m 1.9288 D1s 3.9000 d2s 2.150 d3s 2.6476 d5s 3.4923 D5s 5.5202 d6s 4.5754 D6s 6.5600 d0s 2.7617 d0m 7.7888 D0s 5.1256 D0m 8.1546 EP12 0.3233 EP23 0.393 EP34 0.5656 EP45 0.5465 EP56 0.6491

[0146] Example 6

[0147] like Figure 11 As shown, a schematic diagram of the optical imaging device of Embodiment Six is ​​presented.

[0148] like Figure 11As shown, the optical imaging device includes a lens barrel P0 and the following elements arranged sequentially from the object side to the image side along the optical axis of the lens barrel P0: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7.

[0149] like Figure 11 As shown, the object-side and image-side surfaces of the first spacer element P1 are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side and image-side surfaces of the second spacer element P2 are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer element P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side and image-side surfaces of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side and image-side surfaces of the fifth spacer element P5 are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side and image-side surfaces of the sixth spacer element P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively.

[0150] In Embodiment Six, the radii of curvature, center thickness, focal length, and other parameters of the first to seventh lenses of the optical imaging device, as well as the spacing between the lenses and the higher-order coefficients, are the same as in Embodiment Four. However, the thickness, inner diameter, and outer diameter of the lens barrel, the first spacer element, and the sixth spacer element are different from those in Embodiment Four. Therefore, the basic structural parameter table of the optical imaging device and the higher-order coefficients of each aspherical surface can be found in Embodiment Four.

[0151] In summary, the parameters of the optical imaging device in Embodiment Six are shown in Table 11, with the unit being millimeters (mm).

[0152] Table 11

[0153] d1s 1.8889 d1m 1.8889 D1s 3.2021 d2s 2.1291 d3s 2.6127 d5s 3.4523 D5s 5.5402 d6s 4.5354 D6s 6.5800 d0s 2.7617 d0m 7.7888 D0s 5.1256 D0m 8.1546 EP12 0.3011 EP23 0.3914 EP34 0.5542 EP45 0.5465 EP56 0.6491

[0154] Example 7

[0155] like Figure 16 , Figures 19 to 22 As shown, the optical imaging device of Embodiment Seven is described. Figure 16 A schematic diagram of the optical imaging device of Embodiment 7 is shown.

[0156] like Figure 16As shown, the optical imaging device includes a lens barrel P0 and the following elements arranged sequentially from the object side to the image side along the optical axis of the lens barrel P0: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7.

[0157] like Figure 16 As shown, the object-side and image-side surfaces of the first spacer element P1 are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side and image-side surfaces of the second spacer element P2 are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer element P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side and image-side surfaces of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side and image-side surfaces of the fifth spacer element P5 are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side and image-side surfaces of the sixth spacer element P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. In summary, the parameters of the optical imaging device of Embodiment Seven are shown in Table 12, with units in mm.

[0158] Table 12

[0159] d1s 1.9643 d1m 1.9643 D1s 3.8997 d2s 2.4265 d3s 2.9493 d5s 3.4842 D5s 5.1504 d6s 4.2961 D6s 6.5511 d0s 2.8000 d0m 7.7000 D0s 5.0000 D0m 8.1000 EP12 0.3828 EP23 0.4945 EP34 0.5674 EP45 0.5874 EP56 0.9003

[0160] In Embodiment Seven, the first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has positive optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens E3 has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fifth lens E5 has negative optical power, its object-side surface S9 is concave, and its image-side surface S10 is convex. The sixth lens E6 has positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The seventh lens E7 has negative optical power, its object-side surface S13 is convex, and its image-side surface S14 is concave.

[0161] In Embodiment Seven, the effective focal length f of the optical imaging device is 4.17 mm, the effective focal length f1 of the first lens is -37.27 mm, the effective focal length f2 of the second lens is 5.83 mm, the effective focal length f3 of the third lens is -6.59 mm, the effective focal length f4 of the fourth lens is 4.25 mm, the effective focal length f5 of the fifth lens is -48.80 mm, the effective focal length f6 of the sixth lens is 6.56 mm, and the effective focal length f7 of the seventh lens is -3.15 mm.

[0162] Table 13 shows the basic structural parameters of the optical imaging device of Embodiment 7, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, which is located on the object side of the first lens E1.

[0163] Table 13

[0164]

[0165] Table 14 shows the higher-order coefficients that can be used for each aspherical surface in Example 7, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0166] Table 14

[0167]

[0168]

[0169] Figure 19 The on-axis chromatic aberration curve of the optical imaging device of Embodiment 7 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 20 The astigmatism curves of the optical imaging device of Embodiment 7 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 21 The distortion curves of the optical imaging device of Embodiment 7 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 22 The magnification chromatic aberration curve of the optical imaging device of Embodiment 7 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the optical imaging device.

[0170] according to Figures 19 to 22 It can be seen that the optical imaging device given in Embodiment 7 can achieve good imaging quality.

[0171] Example 8

[0172] like Figure 17 As shown, a schematic diagram of the optical imaging device of Embodiment 8 is presented.

[0173] like Figure 17As shown, the optical imaging device includes a lens barrel P0 and the following elements arranged sequentially from the object side to the image side along the optical axis of the lens barrel P0: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7.

[0174] like Figure 17 As shown, the object-side and image-side surfaces of the first spacer element P1 are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side and image-side surfaces of the second spacer element P2 are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer element P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side and image-side surfaces of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side and image-side surfaces of the fifth spacer element P5 are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side and image-side surfaces of the sixth spacer element P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively.

[0175] In Embodiment 8, the radii of curvature, center thickness, focal length, and other parameters of the first to seventh lenses of the optical imaging device, as well as the spacing between the lenses and the higher-order coefficients, are the same as in Embodiment 7. However, the thickness, inner diameter, and outer diameter of the lens barrel, the first spacer element, and the sixth spacer element are different from those in Embodiment 7. Therefore, the basic structural parameter table of the optical imaging device and the higher-order coefficients of each aspherical surface can be found in Embodiment 7.

[0176] In summary, the data for the optical imaging device of Embodiment 8 are shown in Table 15, with units in millimeters (mm).

[0177] Table 15

[0178]

[0179]

[0180] Example 9

[0181] like Figure 18 As shown, a schematic diagram of the optical imaging device of Embodiment Nine is presented.

[0182] like Figure 18As shown, the optical imaging device includes a lens barrel P0 and the following elements arranged sequentially from the object side to the image side along the optical axis of the lens barrel P0: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, and a seventh lens E7.

[0183] like Figure 18 As shown, the object-side and image-side surfaces of the first spacer element P1 are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side and image-side surfaces of the second spacer element P2 are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer element P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side and image-side surfaces of the fourth spacer element P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side and image-side surfaces of the fifth spacer element P5 are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side and image-side surfaces of the sixth spacer element P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively.

[0184] In Embodiment Nine, the radii of curvature, center thickness, focal length, and other parameters of the first to seventh lenses of the optical imaging device, as well as the spacing between the lenses and the higher-order coefficients, are the same as in Embodiment Seven. However, the thickness, inner diameter, and outer diameter of the lens barrel, the first spacer element, and the sixth spacer element are different from those in Embodiment Seven. Therefore, the basic structural parameter table of the optical imaging device and the higher-order coefficients of each aspherical surface can be found in Embodiment Seven.

[0185] In summary, the data for the optical imaging device of Embodiment 9 are shown in Table 16, with the unit being millimeters (mm).

[0186] Table 16

[0187]

[0188]

[0189] In summary, Examples 1 to 9 satisfy the relationships shown in Table 17.

[0190] Table 17

[0191] f1 / (R1+R2) -4.12 -4.12 -4.12 -2.67 -2.67 -2.67 -1.03 -1.03 -1.03 f1 / D1s -5.98 -5.89 -7.16 -4.65 -4.65 -5.66 -9.56 -9.46 -11.45 (D1s-d1s) / EP12 6.73 6.05 4.72 6.37 6.10 4.36 5.06 4.89 3.43 f23 / EP23 24.48 24.48 26.18 31.15 31.15 31.27 86.19 86.19 83.13 f34 / EP34 25.77 26.28 23.63 15.10 15.10 15.41 17.98 17.98 17.98 f45 / EP45 7.99 7.99 7.99 7.10 7.10 7.10 8.00 8.00 8.00 EP34 / |SAG42| 1.37 1.34 1.49 1.43 1.43 1.41 1.29 1.29 1.29 |f5| / D5s 6.14 6.09 6.11 11.03 11.11 11.07 9.47 9.40 9.44 (R5+R6) / (R5-R6) 1.51 1.51 1.51 1.79 1.79 1.79 1.27 1.27 1.27 EP56 / |SAG52| 3.26 3.11 3.26 4.03 4.03 4.03 4.12 4.12 4.12 (D0m-D0s) / f 0.76 0.76 0.76 0.80 0.80 0.80 0.74 0.74 0.74 (d0m-d0s) / TD 1.31 1.31 1.31 1.29 1.29 1.29 1.10 1.10 1.10 (R5×d2s) / (R2×d1m) 6.14 6.09 6.08 4.36 4.47 4.52 3.08 3.10 3.08 R11×N6 / (D6s-d6s) 3.68 3.48 3.68 3.34 3.44 3.34 2.59 2.57 2.59 (D5s-d5s) / DT52 1.33 1.33 1.33 1.25 1.21 1.25 0.99 1.01 0.99 (T56+CT6+T67) / EP56 1.87 1.96 1.87 2.03 2.03 2.03 2.06 2.06 2.06 CT3 / T34 2.76 2.76 2.76 2.75 2.75 2.75 1.55 1.55 1.55 d3s / Yc32 3.71 3.77 3.65 3.73 3.76 3.71 3.18 3.21 3.20

[0192] Table 18 shows the effective focal length, effective focal length of each lens, and SAG parameters of the optical imaging devices of Embodiments 1 to 9. In the table below, Semi-FOV is half of the maximum field of view of the optical imaging device.

[0193] Table 18

[0194] f(mm) 3.74 3.79 4.17 f1(mm) -23.16 -18.13 -37.27 f2 (mm) 3.97 4.64 5.83 f3 (mm) -6.13 -7.10 -6.59 f4 (mm) 4.40 4.04 4.25 f5 (mm) 33.04 61.32 -48.80 f6 (mm) 6.64 6.81 6.56 f7 (mm) -2.49 -2.60 -3.15 Semi-FOV (°) 55.00 55.00 47.00 FNO 2.20 2.30 2.60 f23(mm) 10.16 12.24 42.62 f34 (mm) 13.36 8.54 10.20 f45 (mm) 4.00 3.88 4.70 TD(mm) 3.7149 3.9063 4.4435 DT52 (mm) 1.5842 1.6749 1.6837 Yc32(mm) 0.6840 0.7043 0.9268 SAG42 (mm) -0.3797 -0.3943 -0.4402 SAG52 (mm) -0.1956 -0.1609 -0.2186

[0195] This application also provides an optical device whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The optical device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The optical device is equipped with the optical imaging apparatus described above.

[0196] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0197] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0198] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0199] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical imaging device, characterized in that, comprising a lens barrel, a lens group and a plurality of spacer elements arranged in the lens barrel, said lens group consists of seven lenses, and said seven lenses are sequentially arranged from the object side to the image side along the optical axis of the optical imaging device as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens; there is an air gap between every two adjacent lenses among said first lens to said seventh lens; said first lens has negative optical power, the object-side surface of said first lens is a convex surface, and the image-side surface of said first lens is a concave surface; said second lens has positive optical power, the object-side surface of said second lens is a concave surface, and the image-side surface of said second lens is a convex surface; said third lens has negative optical power, the object-side surface of said third lens is a convex surface, and the image-side surface of said third lens is a concave surface; said fourth lens has positive optical power, both the object-side surface and the image-side surface of said fourth lens are convex surfaces; the object-side surface of said fifth lens is a concave surface, and the image-side surface of said fifth lens is a convex surface; said sixth lens has positive optical power, and the object-side surface of said sixth lens is a convex surface; said seventh lens has negative optical power, the object-side surface of said seventh lens is a convex surface, and the image-side surface of said seventh lens is a concave surface; said plurality of spacer elements comprise a first spacer element arranged between said first lens and said second lens and in contact with the image-side surface of said first lens, and a second spacer element arranged between said second lens and said third lens and in contact with the image-side surface of said second lens; the effective focal length f1 of said first lens, the curvature radius R1 of the object-side surface of said first lens and the curvature radius R2 of the image-side surface of said first lens satisfy: -4.15 < f1 / (R1+R2) < -1.00; the effective focal length f1 of said first lens and the outer diameter D1s of the object-side surface of said first spacer element satisfy: -11.50 < f1 / D1s < -4.60; the outer diameter D1s of the object-side surface of said first spacer element, the inner diameter d1s of the object-side surface of said first spacer element and the spacing distance EP12 between the image-side surface of said first spacer element and the object-side surface of said second spacer element on the optical axis satisfy: 3.40 < (D1s - d1s) / EP12 < 6.

75.

2. The optical imaging device according to claim 1, characterized in that, said plurality of spacer elements further comprise a third spacer element arranged between said third lens and said fourth lens and in contact with the image-side surface of said third lens, the curvature radius R5 of the object-side surface of said third lens and the curvature radius R6 of the image-side surface of said third lens satisfy: 1.25 < (R5+R6) / (R5-R6) < 1.80; the combined focal length f23 of said second lens and said third lens and the spacing distance EP23 between the image-side surface of said second spacer element and the object-side surface of said third spacer element on the optical axis satisfy: 24.45 < f23 / EP23 < 86.

20.

3. The optical imaging device according to claim 1, characterized in that, The plurality of spacers also includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image-side surface of the third lens, and a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens. The combined focal length f34 of the third and fourth lenses satisfies the following relationship with the distance EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element on the optical axis: 15.

05. <f34 / EP34<26.30。 4. The optical imaging device according to claim 1, characterized in that, The plurality of spacers further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, and a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens. The combined focal length f45 of the fourth and fifth lenses satisfies 7.05 with the distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element on the optical axis. <f45 / EP45<8.05。 5. The optical imaging device according to claim 1, characterized in that, The plurality of spacers also includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image-side surface of the third lens, and a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens. The distance EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element on the optical axis, and the axial displacement SAG42 between the intersection 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: 1.25 <EP34 / |SAG42|<1.50。 6. The optical imaging device according to claim 1, characterized in that, The plurality of spacers also includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens. The effective focal length f5 of the fifth lens and the outer diameter D5s of the object side of the fifth spacer element satisfy the following condition: 6.05 < |f5| / D5s < 11.

15.

7. The optical imaging device according to claim 1, characterized in that, The plurality of spacers also includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens. The air gap T56 between the fifth and sixth lenses on the optical axis, the air gap T67 between the sixth and seventh lenses on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the distance EP56 between the image side of the fifth spacer element and the object side of the sixth spacer element on the optical axis satisfy the following condition: 1.85 < (T56 + CT6 + T67) / EP56 < 2.

10.

8. The optical imaging device according to claim 1, characterized in that, The plurality of spacers also includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens. The distance EP56 between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element on the optical axis, and the axial displacement SAG52 between the intersection of the image-side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image-side surface of the fifth lens, satisfy: 3.10 <EP56 / |SAG52|<4.15。 9. The optical imaging device according to claim 1, characterized in that, The outer diameter D0s of the object side of the lens barrel, the outer diameter D0m of the image side of the lens barrel, and the effective focal length f of the optical imaging device satisfy the following condition: 0.70 < (D0m - D0s) / f < 0.

85.

10. The optical imaging device according to claim 1, characterized in that, The inner diameter d0s of the object side of the lens barrel, the inner diameter d0m of the image side of the lens barrel, and the axial distance TD from the object side of the first lens to the image side of the seventh lens satisfy the following condition: 1.05 < (d0m - d0s) / TD < 1.

35.

11. The optical imaging device according to claim 1, characterized in that, The radius of curvature R2 of the image side of the first lens, the radius of curvature R5 of the object side of the third lens, the inner diameter d2s of the object side of the second spacer element and the inner diameter d1m of the image side of the first spacer element satisfy the following condition: 3.05 < (R5 × d2s) / (R2 × d1m) < 6.

15.

12. The optical imaging apparatus according to any one of claims 1 to 11, characterized in that, The plurality of spacers also includes a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens. The radius of curvature R11 of the object-side surface of the sixth lens, the refractive index N6 of the sixth lens, and the outer diameter D6s and inner diameter d6s of the object-side surface of the sixth spacer element satisfy the following relationship: 2.55 <R11×N6 / (D6s-d6s)<3.70。 13. The optical imaging apparatus according to any one of claims 1 to 11, characterized in that, The plurality of spacers also includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens. The inner diameter d5s of the object side of the fifth spacer element, the outer diameter D5s of the object side of the fifth spacer element, and the effective radius DT52 of the image side of the fifth lens satisfy the following condition: 0.95 < (D5s - d5s) / DT52 < 1.

35.

14. The optical imaging apparatus according to any one of claims 1 to 11, characterized in that, The plurality of spacers also includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image-side surface of the third lens. The central thickness CT3 of the third lens on the optical axis and the air gap T34 between the third and fourth lenses on the optical axis satisfy the following condition: 1.

50. <CT3 / T34<2.80; The inner diameter d3s of the object-side surface of the third spacer element and the radial distance Yc32 from the inflection point of the image-side surface of the effective diameter portion of the third lens away from the optical axis satisfy the following condition: 3.15 <d3s / Yc32<3.80。

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