Optical imaging device

Abstract

The invention discloses an optical imaging device, which comprises a lens group and a spacing element group, and is characterized in that the lens group comprises first to eighth lenses which are sequentially arranged from an object side to an image side along an optical axis and respectively have positive, positive, negative, positive, negative, positive, negative and negative focal powers; the spacing element group comprises spacing elements respectively positioned between the first lens and the second lens, between the second lens and the third lens, between the third lens and the fourth lens, between the fourth lens and the fifth lens and between the fifth lens and the sixth lens; first to seventh spacer elements between the sixth and seventh lenses and between the seventh and eighth lenses and in contact with image side surfaces of the first to seventh lenses, respectively; the effective focal length f1 of the first lens, the outer diameter D1s and the inner diameter d1s of the object side surface of the first spacing element, the effective focal length f7 of the seventh lens, the outer diameter D7s and the inner diameter d7s of the object side surface of the seventh spacing element, the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT21 of the object side surface of the second lens meet the following conditions: 4.5 < = f1 / (D1s-d1s) < = 8.3, 26.0 < = f7 / (D7s-d7s) < =-18.0 and 0.99lt; dT11 / DT21lt; 1.05).

Description

Technical Field

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

[0002] With the continuous development of mobile phone lenses, multi-element large-aperture lenses are gradually becoming the future trend. Based on this, those skilled in the art are dedicated to developing and designing an eight-element optical lens with high light intake, which can balance various aberrations, reduce lens sensitivity, and have miniaturization characteristics, so as to better meet people's increasingly high requirements for optical systems such as mobile phone lenses. Summary of the Invention

[0003] This application provides an optical imaging device, which may include a lens group and a spacer element group. The lens group includes, along the optical axis from the object side to the image side, a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, and an eighth lens with negative optical power. The spacer element group includes: a first spacer element located between the first lens and the second lens and at least partially in contact with the image side of the first lens, a spacer element located between the second lens and the third lens, and a spacer element that is in contact with the image side of the first lens. A second spacer element that is at least partially in contact with the image side of the second lens; a third spacer element that is located between the third and fourth lenses and is at least partially in contact with the image side of the third lens; a fourth spacer element that is located between the fourth and fifth lenses and is at least partially in contact with the image side of the fourth lens; a fifth spacer element that is located between the fifth and sixth lenses and is at least partially in contact with the image side of the fifth lens; a sixth spacer element that is located between the sixth and seventh lenses and is at least partially in contact with the image side of the sixth lens; and a seventh spacer element that is located between the seventh and eighth lenses and is at least partially in contact with the image side of the seventh lens. The effective focal length f1 of the first lens, the outer diameter D1s of the object-side surface of the first spacer element, and the inner diameter d1s of the object-side surface of the first spacer element can satisfy: 4.5 ≤ f1 / (D1s-d1s) ≤ 8.3; the effective focal length f7 of the seventh lens, the outer diameter D7s of the object-side surface of the seventh spacer element, and the inner diameter d7s of the object-side surface of the seventh spacer element can satisfy: -26.0 ≤ f7 / (D7s-d7s) ≤ -18.0; the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT21 of the object-side surface of the second lens can satisfy: 0.99 <DT11 / DT21<1.05。

[0004] In one embodiment, the inner diameter d7m of the image side of the seventh spacer element, the radius of curvature R15 of the object side of the eighth lens, the inner diameter d7s of the object side of the seventh spacer element, and the radius of curvature R14 of the image side of the seventh lens can satisfy: 5.5≤d7m / R15+d7s / R14≤6.7.

[0005] In one embodiment, the optical imaging device may further include a lens barrel, a lens group and a spacer group that can be assembled in the lens barrel; the inner diameter d0m of the image-side end face of the lens barrel, the outer diameter D7m of the image-side side face of the seventh spacer element and the effective focal length f8 of the eighth lens can satisfy: -0.3≤(d0m-D7m) / f8≤-0.05.

[0006] In one embodiment, an air gap exists between any two adjacent lenses from the first to the eighth lens along the optical axis. The air gap T78 between the seventh and eighth lenses along the optical axis is the maximum value among the air gaps between any two adjacent lenses. The sum of the air gap T78 between the seventh and eighth lenses and the air gaps ∑AT between any two adjacent lenses from the first to the eighth lens along the optical axis satisfies: 0.4 <T78 / ∑AT<0.5。

[0007] In one embodiment, the inner diameter d7s of the object side of the seventh spacer element, the inner diameter d6s of the object side of the sixth spacer element, and the center thickness CT7 of the seventh lens on the optical axis can satisfy: 2.4≤(d7s-d6s) / CT7≤5.5.

[0008] In one embodiment, the optical imaging device may further include a lens barrel, a lens group and a spacer group that can be assembled in the lens barrel; the inner diameter d0s of the object side end face of the lens barrel, the inner diameter d1s of the object side face of the first spacer, the center thickness CT1 of the first lens on the optical axis and the refractive index N1 of the first lens can satisfy: 1.65≤(d0s-d1s) / (CT1×N1)≤2.

[0009] In one embodiment, the inner diameter d1m of the image side of the first spacer element, the radius of curvature R3 of the object side of the second lens, the inner diameter d2s of the object side of the second spacer element, and the radius of curvature R4 of the image side of the second lens can satisfy: 0.7≤d1m / R3-d2s / R4≤0.9.

[0010] In one embodiment, the inner diameter of each spacer element increases sequentially from the third spacer element to the seventh spacer element.

[0011] In one embodiment, the inner diameter dis of the object side of the i-th spacer in the spacer group and the inner diameter d(i+1)s of the object side of the (i+1)-th spacer can satisfy: 1≤d(i+1)s / dis≤1.4, where i=3, 4, 5 or 6.

[0012] In one embodiment, among the first to seventh spacers, the fourth spacer has the largest toroidal area; the outer diameter D4s of the object side of the fourth spacer, the inner diameter d4s of the object side of the fourth spacer, and the air gap T45 between the fourth lens and the fifth lens on the optical axis can satisfy: 10.6≤(D4s-d4s) / T45≤15.7.

[0013] The optical imaging device according to an embodiment of the present application includes a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, a sixth lens with a positive optical power, a seventh lens with a negative optical power, and an eighth lens with a negative optical power, which are arranged in sequence from the object side to the image side along the optical axis. There is a first spacer element that at least partially contacts the image side surface of the first lens between the first lens and the second lens, a second spacer element that at least partially contacts the image side surface of the second lens between the second lens and the third lens, a third spacer element that at least partially contacts the image side surface of the third lens between the third lens and the fourth lens, a fourth spacer element that at least partially contacts the image side surface of the fourth lens between the fourth lens and the fifth lens, a fifth spacer element that at least partially contacts the image side surface of the fifth lens between the fifth lens and the sixth lens, a sixth spacer element that at least partially contacts the image side surface of the sixth lens between the sixth lens and the seventh lens, and a seventh spacer element that at least partially contacts the image side surface of the seventh lens between the seventh lens and the eighth lens. The effective focal length f1 of the first lens, the outer diameter D1s and the inner diameter d1s of the object side surface of the first spacer element satisfy the conditional expression 4.5 ≤ f1 / (D1s - d1s) ≤ 8.3, the effective focal length f7 of the seventh lens, the outer diameter D7s and the inner diameter d7s of the object side surface of the seventh spacer element satisfy the conditional expression -26.0 ≤ f7 / (D7s - d7s) ≤ -18.0, and the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT21 of the object side surface of the second lens satisfy the conditional expression 0.99 < DT11 / DT21 < 1.05. Through the above settings of the optical imaging device, the outer diameters of the first lens and the second lens and the outer diameter and the inner diameter of the object side surface of the first spacer element can be fully restricted, and the outer diameters of the seventh lens and the eighth lens and the outer diameter and the inner diameter of the object side surface of the seventh spacer element can be fully restricted, which is beneficial to restricting the mechanical structure of the lens, ensuring that it has a smaller head size and also has a smaller tail size, thereby reducing the size of the camera module and facilitating the assembly of the overall machine's external dimensions; at the same time, it can also overcome the sensitivity problems of the image side surface of the first lens and the object side surface of the second lens caused by the small size of the structure, can reduce the light deflection angle from the first lens to the second lens to a certain extent, is beneficial to reducing the sensitivity of the image side surface of the first lens and the object side surface of the second lens, reducing the requirements for the assembly process, and is beneficial to ensuring the performance of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In conjunction with the accompanying drawings, through the following detailed description of non-limiting embodiments, other features, objects, and advantages of the present application will become more apparent. In the drawings:

[0015] Figure 1 The structure and related parameter schematic diagram of the optical imaging device according to an exemplary embodiment of the present application are shown;

[0016] Figure 2 A schematic diagram of the structure of an optical imaging device according to Embodiment 1 of this application is shown;

[0017] Figure 3 A schematic diagram of the structure of an optical imaging device according to Embodiment 2 of this application is shown;

[0018] Figure 4 A schematic diagram of the structure of an optical imaging device according to Embodiment 3 of this application is shown;

[0019] Figures 5 to 7 The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging apparatus according to Embodiments 1, 2, and 3 of this application are shown.

[0020] Figure 8 A schematic diagram of the structure of an optical imaging device according to Embodiment 4 of this application is shown;

[0021] Figure 9 A schematic diagram of the structure of an optical imaging device according to Embodiment 5 of this application is shown;

[0022] Figure 10 A schematic diagram of the structure of an optical imaging device according to Embodiment 6 of this application is shown;

[0023] Figures 11 to 13 The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging apparatus according to Embodiments 4, 5, and 6 of this application are shown.

[0024] Figure 14 A schematic diagram of the structure of an optical imaging device according to Embodiment 7 of this application is shown;

[0025] Figure 15 A schematic diagram of the structure of an optical imaging device according to Embodiment 8 of this application is shown;

[0026] Figure 16 A schematic diagram of the structure of an optical imaging device according to Embodiment 9 of this application is shown; and

[0027] Figures 17 to 19 The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging apparatus according to Embodiments 7, 8, and 9 of this application are shown.

[0028] Figure 20 The MTF attenuation curve of the optical imaging device is shown under the condition that f1 / (D1s-d1s)=6.6;

[0029] Figure 21The MTF attenuation curve of the optical imaging device is shown when the condition f1 / (D1s-d1s) = 10.64 is satisfied; and

[0030] Figure 22 The MTF attenuation curve of the optical imaging device is shown when the condition f1 / (D1s-d1s)=2.95 is satisfied. Detailed Implementation

[0031] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0032] 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.

[0033] 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 strictly to scale.

[0034] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to methods commonly used in the art, such as using the sign of the R value (R refers to the radius of curvature of the paraxial region) to determine concavity or convexity. In this paper, the surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens. For the object-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0035] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0036] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] The features, principles and other aspects of this application are described in detail below.

[0039] An optical imaging apparatus according to an exemplary embodiment of this application may include a lens group and a spacer element group, wherein the lens group may be an eight-lens group, for example, the lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first to eighth lenses may, for example, be arranged sequentially along the optical axis from the object side to the image side.

[0040] In an exemplary embodiment, the first lens may have positive optical power. The second lens may have positive optical power. The third lens may have negative optical power. The fourth lens may have positive optical power. The fifth lens may have negative optical power. The sixth lens may have positive optical power. The seventh lens may have negative optical power. The eighth lens may have negative optical power.

[0041] In an exemplary embodiment, there may be an air gap between each adjacent two of the first lens to the eighth lens, that is, there may be a gap on the optical axis between each adjacent two of the first lens to the eighth lens.

[0042] In an exemplary embodiment, the spacer element group may include: a first spacer element located between the first lens and the second lens and at least partially contacting the image side surface of the first lens; a second spacer element located between the second lens and the third lens and at least partially contacting the image side surface of the second lens; a third spacer element located between the third lens and the fourth lens and at least partially contacting the image side surface of the third lens; a fourth spacer element located between the fourth lens and the fifth lens and at least partially contacting the image side surface of the fourth lens; a fifth spacer element located between the fifth lens and the sixth lens and at least partially contacting the image side surface of the fifth lens; a sixth spacer element located between the sixth lens and the seventh lens and at least partially contacting the image side surface of the sixth lens; and a seventh spacer element located between the seventh lens and the eighth lens and at least partially contacting the image side surface of the seventh lens.

[0043] In an exemplary embodiment, the optical imaging device of the present application may satisfy the conditional formula 4.5 ≤ f1 / (D1s - d1s) ≤ 8.3, where f1 is the effective focal length of the first lens, D1s is the outer diameter of the object side surface of the first spacer element, and d1s is the inner diameter of the object side surface of the first spacer element.

[0044] In an exemplary embodiment, the optical imaging device of the present application may satisfy the conditional formula -26.0 ≤ f7 / (D7s - d7s) ≤ -18.0, where f7 is the effective focal length of the seventh lens, D7s is the outer diameter of the object side surface of the seventh spacer element, and d7s is the inner diameter of the object side surface of the seventh spacer element.

[0045] In an exemplary embodiment, the optical imaging device of the present application may satisfy the conditional formula 0.99 < DT11 / DT21 < 1.05, where DT11 is the maximum effective radius of the object side surface of the first lens, and DT21 is the maximum effective radius of the object side surface of the second lens.

[0046] According to an embodiment of the present application, an optical imaging device is provided with an eight-piece lens group arranged in sequence from the object side to the image side along the optical axis: a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, a sixth lens with a positive optical power, a seventh lens with a negative optical power, and an eighth lens with a negative optical power. First to seventh spacer elements are respectively arranged between every two adjacent lenses, and the first to seventh spacer elements are at least partially in contact with the image sides of the first to seventh lenses. At the same time, it is controlled that the effective focal length f1 of the first lens, the outer diameter D1s and the inner diameter d1s of the object side of the first spacer element satisfy the conditional expression 4.5 ≤ f1 / (D1s - d1s) ≤ 8.3, the effective focal length f7 of the seventh lens, the outer diameter D7s and the inner diameter d7s of the object side of the seventh spacer element satisfy the conditional expression -26.0 ≤ f7 / (D7s - d7s) ≤ -18.0, and the maximum effective radius DT11 of the object side of the first lens and the maximum effective radius DT21 of the object side of the second lens satisfy the conditional expression 0.99 < DT11 / DT21 < 1.05. This can fully limit the outer diameters of the first lens and the second lens, the outer diameter and the inner diameter of the object side of the first spacer element, and can fully limit the outer diameters of the seventh lens and the eighth lens, the outer diameter and the inner diameter of the object side of the seventh spacer element, which is beneficial to restricting the mechanical structure of the lens, ensuring that it has a small head size and also a small tail size, thereby reducing the size of the camera module and facilitating the assembly of the overall machine's external dimensions. At the same time, it can also overcome the sensitivity problems of the image side of the first lens and the object side of the second lens caused by the small size of the structure, can reduce the light deflection angle from the first lens to the second lens to a certain extent, is beneficial to reducing the sensitivity of the image side of the first lens and the object side of the second lens, reducing the requirements for the assembly process, and is beneficial to ensuring the performance of the lens.

[0047] See Figures 20 to 22 , where Figure 20 shows the MTF attenuation curve of the optical imaging device under the conditions of 4.5 ≤ f1 / (D1s - d1s) ≤ 8.3, 0.99 < DT11 / DT21 < 1.05, and f1 / (D1s - d1s) = 6.6. Figure 21 shows the MTF attenuation curve of the optical imaging device under the conditions of 4.5 ≤ f1 / (D1s - d1s) ≤ 8.3, 0.99 < DT11 / DT21 < 1.05, and f1 / (D1s - d1s) = 10.64. Figure 22 shows the MTF attenuation curve of the optical imaging device under the conditions of 4.5 ≤ f1 / (D1s - d1s) ≤ 8.3, 0.99 < DT11 / DT21 < 1.05, and f1 / (D1s - d1s) = 2.95. Figures 20 to 22The DLY s2 curve shown in the figure represents the eccentricity influence of the image side (S2) of the first lens, and the DLY s3 curve represents the eccentricity influence of the object side (S3) of the second lens. Under the same tolerance, the smaller the MTF drop amount shown by the curve in the figure, the lower the sensitivity of the corresponding surface or component.

[0048] Compare Figures 20 to 22 It can be seen that when the value of the conditional formula f1 / (D1s - d1s) of the effective focal length f1 of the first lens and the outer diameter D1s and inner diameter d1s of the object side of the first spacer element is within the range of greater than or equal to 4.5 and less than or equal to 8.3, for example Figure 20 in the shown scheme, f1 / (D1s - d1s) = 6.6. At this time, the MTF drop amounts shown by the two curves of DLY s2 and DLY s3 in the figure are both relatively small, indicating that the sensitivities of the image side (S2) of the first lens and the object side (S3) of the second lens are both relatively low, which is beneficial to reducing the requirements for the assembly process and is beneficial to the performance of the optical imaging device to meet the design requirements; while when the value of the conditional formula f1 / (D1s - d1s) is not within the range of greater than or equal to 4.5 and less than or equal to 8.3, for example Figure 21 in the shown scheme where f1 / (D1s - d1s) = 10.64, at this time, the MTF drop amounts shown by the two curves of DLY s2 and DLY s3 in the figure are both relatively large, and the sensitivities of the image side (S2) of the first lens and the object side (S3) of the second lens perform poorly, and the sensitivity of the edge field of view deteriorates, which is not conducive to the realization of optical performance; and for another example Figure 22 in the shown scheme where f1 / (D1s - d1s) = 2.95, at this time, the MTF drop amounts shown by the two curves of DLY s2 and DLY s3 in the figure are also both relatively large, and the sensitivities of the image side (S2) of the first lens and the object side (S3) of the second lens also perform poorly, and the sensitivity of the entire field of view deteriorates, which is not conducive to assembly and is not conducive to the realization of system performance. Therefore, the optical imaging device according to the embodiment of the present application controls the conditional formulas 4.5 ≤ f1 / (D1s - d1s) ≤ 8.3 and 0.99 < DT11 / DT21 < 1.05, and at the same time controls f1, D1s and d1s to satisfy the conditional formula 4.5 ≤ f1 / (D1s - d1s) ≤ 8.3, which is beneficial to restricting the mechanical structure, ensuring that it has a smaller head size and tail size, and at the same time can reduce the light deflection angle from the first lens to the second lens to a certain extent, reduce the sensitivities of the image side of the first lens and the object side of the second lens, reduce the requirements for the assembly process, and is beneficial to the realization of system performance.

[0049] In an exemplary embodiment, the optical imaging apparatus according to an exemplary embodiment of this application may further include a lens barrel. Lens groups and spacer element groups may be assembled in the lens barrel. The lens barrel may have an object-side end face closest to the object side and perpendicular or nearly perpendicular to the optical axis, and an image-side end face closest to the image side and perpendicular or nearly perpendicular to the optical axis. The lens barrel may also have an outer annular surface and an inner annular surface, the inner annular surface of which may, for example, be stepped, to facilitate the assembly and accommodation of sequentially arranged lenses and spacer elements.

[0050] In an exemplary embodiment, the object-side surface of the first lens may be convex, and the image-side surface may be concave. The object-side surface of the second lens may be convex, and the image-side surface may be convex. The object-side surface of the third lens may be convex, and the image-side surface may be concave. The object-side surface of the fourth lens may be convex, and the image-side surface may be convex. The object-side surface of the fifth lens may be concave, and the image-side surface may be concave. The object-side surface of the sixth lens may be convex, and the image-side surface may be convex. The object-side surface of the seventh lens may be convex, and the image-side surface may be concave. The object-side surface of the eighth lens may be convex, and the image-side surface may be concave.

[0051] In an exemplary embodiment, the optical imaging device of this application can satisfy the condition 5.5≤d7m / R15+d7s / R14≤6.7, where d7m is the inner diameter of the image-side surface of the seventh spacer element, R15 is the radius of curvature of the object-side surface of the eighth lens, d7s is the inner diameter of the object-side surface of the seventh spacer element, and R14 is the radius of curvature of the image-side surface of the seventh lens. By controlling the optical imaging device to satisfy the condition 5.5≤d7m / R15+d7s / R14≤6.7, the light rays passing through the edge system of the seventh lens can be effectively controlled, the light rays of the flange portion can be intercepted, and stray light can be reduced.

[0052] In an exemplary embodiment, the optical imaging device of this application can satisfy the condition -0.3≤(d0m-D7m) / f8≤-0.05, where d0m is the inner diameter of the image-side end face of the lens barrel, D7m is the outer diameter of the image-side surface of the seventh spacer element, and f8 is the effective focal length of the eighth lens. By controlling the optical imaging device to satisfy the condition -0.3≤(d0m-D7m) / f8≤-0.05, the lens dimensions can be effectively controlled, facilitating module assembly and reducing the module size.

[0053] In an exemplary embodiment, in the direction along the optical axis, there are air gaps between any two adjacent lenses among the first lens to the eighth lens. Among them, the air gap T78 between the seventh lens and the eighth lens on the optical axis is the maximum of the air gaps between any two adjacent lenses on the optical axis; and, the air gap T78 between the seventh lens and the eighth lens on the optical axis and the sum ∑AT of the air gaps between any two adjacent lenses among the first lens to the eighth lens on the optical axis satisfy the conditional expression 0.4 < T78 / ∑AT < 0.5. By controlling the optical imaging device to satisfy this conditional expression, the defocus amount of the full field of view can be effectively controlled, and the system sensitivity can be reduced.

[0054] In an exemplary embodiment, the optical imaging device of the present application can satisfy the conditional expression 2.4 ≤ (d7s - d6s) / CT7 ≤ 5.5, where d7s is the inner diameter of the object side surface of the seventh spacer element, d6s is the inner diameter of the object side surface of the sixth spacer element, and CT7 is the central thickness of the seventh lens on the optical axis. By controlling the optical imaging device to satisfy the conditional expression 2.4 ≤ (d7s - d6s) / CT7 ≤ 5.5, the height of the marginal rays of the system can be effectively reduced, and at the same time, the ray angle from the sixth spacer element to the seventh spacer element can be reduced, and the system sensitivity can be reduced.

[0055] In an exemplary embodiment, the optical imaging device of the present application can satisfy the conditional expression 1.65 ≤ (d0s - d1s) / (CT1 × N1) ≤ 2, where d0s is the inner diameter of the object side end surface of the lens barrel, d1s is the inner diameter of the object side surface of the first spacer element, CT1 is the central thickness of the first lens on the optical axis, and N1 is the refractive index of the first lens. By controlling the optical imaging device to satisfy the conditional expression 1.65 ≤ (d0s - d1s) / (CT1 × N1) ≤ 2, the deflection angle of the rays passing through the first lens can be effectively reduced, and the sensitivity of the first lens can be reduced.

[0056] In an exemplary embodiment, the optical imaging device of the present application can satisfy the conditional expression 0.7 ≤ d1m / R3 - d2s / R4 ≤ 0.9, where d1m is the inner diameter of the image side surface of the first spacer element, R3 is the curvature radius of the object side surface of the second lens, d2s is the inner diameter of the object side surface of the second spacer element, and R4 is the curvature radius of the image side surface of the second lens. By controlling the optical imaging device to satisfy the conditional expression 0.7 ≤ d1m / R3 - d2s / R4 ≤ 0.9, the off-axis rays outside the system passing through the edge of the second lens can be effectively controlled, and the rays in the flange part can be intercepted, thereby reducing stray light.​​​​

[0058] In an exemplary embodiment, the optical imaging device of this application can satisfy the condition 1≤d(i+1)s / dis≤1.4, where dis is the inner diameter of the object side surface of the i-th spacer in the spacer group, d(i+1)s is the inner diameter of the object side surface of the (i+1)-th spacer, and i = 3, 4, 5, or 6. By controlling this condition, the light deflection angle can be effectively controlled, resulting in a smooth transition and reduced system sensitivity.

[0059] In an exemplary embodiment, among the first to seventh spacers included in the spacer group, the fourth spacer may have the largest toroidal area. The toroidal area of ​​the fourth spacer may, for example, be the area of ​​the annular / toroidal surface or approximately annular / toroidal surface formed between the outer and inner diameters of its object-side surface (and / or image-side surface). The optical imaging device of this application can satisfy the condition 10.6≤(D4s-d4s) / T45≤15.7, where D4s is the outer diameter of the object-side surface of the fourth spacer, d4s is the inner diameter of the object-side surface of the fourth spacer, and T45 is the air gap between the fourth and fifth lenses on the optical axis. By controlling the optical imaging device to satisfy this condition and reasonably controlling the ratio of the annular width of the fourth spacer to the air gap between the fourth and fifth lenses, the assembly contact area between the fourth spacer and adjacent lenses can be effectively controlled, which is beneficial to improving the assembly stability of the fourth spacer.

[0060] In an exemplary embodiment, the optical imaging device of this application may include at least one aperture stop. The aperture stop can constrain the optical path and control the light intensity. The aperture stop can be disposed at an appropriate position in the optical imaging device; for example, the aperture stop can be disposed between the object side and the first lens.

[0061] In an exemplary embodiment, the optical imaging device may optionally include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0062] In an exemplary embodiment, the object-side and image-side surfaces of the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses may have one or more aspherical mirror surfaces. Aspherical mirror surfaces have better radius of curvature characteristics, offering advantages in improving distortion aberrations and astigmatism. Using aspherical mirror surfaces can eliminate aberrations that occur during imaging as much as possible, thereby improving image quality.

[0063] On the one hand, the optical imaging device according to an embodiment of the present application includes a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, a sixth lens with a positive optical power, a seventh lens with a negative optical power, and an eighth lens with a negative optical power, which are arranged in sequence from the object side to the image side along the optical axis. There is a first spacer element that at least partially contacts the image side surface of the first lens between the first lens and the second lens, a second spacer element that at least partially contacts the image side surface of the second lens between the second lens and the third lens, a third spacer element that at least partially contacts the image side surface of the third lens between the third lens and the fourth lens, a fourth spacer element that at least partially contacts the image side surface of the fourth lens between the fourth lens and the fifth lens, a fifth spacer element that at least partially contacts the image side surface of the fifth lens between the fifth lens and the sixth lens, a sixth spacer element that at least partially contacts the image side surface of the sixth lens between the sixth lens and the seventh lens, and a seventh spacer element that at least partially contacts the image side surface of the seventh lens between the seventh lens and the eighth lens. The effective focal length f1 of the first lens, the outer diameter D1s and the inner diameter d1s of the object side surface of the first spacer element satisfy the conditional formula 4.5 ≤ f1 / (D1s - d1s) ≤ 8.3, the effective focal length f7 of the seventh lens, the outer diameter D7s and the inner diameter d7s of the object side surface of the seventh spacer element satisfy the conditional formula -26.0 ≤ f7 / (D7s - d7s) ≤ -18.0, and the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT21 of the object side surface of the second lens satisfy the conditional formula 0.99 < DT11 / DT21 < 1.05. By the above settings of the optical imaging device, the outer diameters of the first lens and the second lens and the outer diameter and the inner diameter of the object side surface of the first spacer element can be fully restricted, and the outer diameters of the seventh lens and the eighth lens and the outer diameter and the inner diameter of the object side surface of the seventh spacer element can be fully restricted, which is beneficial to restricting the mechanical structure of the lens, ensuring that it has a small head size and also a small tail size, thereby reducing the size of the camera module and facilitating the assembly of the overall machine's external dimensions; at the same time, it can also overcome the sensitivity problems of the image side surface of the first lens and the object side surface of the second lens caused by the small structure size, can reduce the light deflection angle from the first lens to the second lens to a certain extent, is beneficial to reducing the sensitivity of the image side surface of the first lens and the object side surface of the second lens, and reducing the requirements for the assembly process, which is beneficial to ensuring the performance of the lens.

[0064] On the other hand, the optical imaging device according to the embodiments of this application includes a lens barrel and a lens group and a spacer element group assembled therein. The lens group includes a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, and an eighth lens with negative optical power, arranged sequentially along the optical axis from the object side to the image side. A first spacer element is provided between the first and second lenses, which at least partially contacts the image-side surface of the first lens; a second spacer element is provided between the second and third lenses, which at least partially contacts the image-side surface of the second lens; a third spacer element is provided between the third and fourth lenses, which at least partially contacts the image-side surface of the third lens; a fourth spacer element is provided between the fourth and fifth lenses, which at least partially contacts the image-side surface of the fourth lens; a fifth spacer element is provided between the fifth and sixth lenses, which at least partially contacts the image-side surface of the fifth lens; a sixth spacer element is provided between the sixth and seventh lenses, which at least partially contacts the image-side surface of the sixth lens; and a seventh spacer element is provided between the seventh and eighth lenses, which at least partially contacts the image-side surface of the seventh lens. The inner diameter d0s of the object-side end face of the lens barrel, the inner diameter d1s of the object-side surface of the first spacer element, the center thickness CT1 of the first lens on the optical axis, and the refractive index N1 of the first lens satisfy the condition 1.65≤(d0s-d1s) / (CT1×N1)≤2. By configuring the optical imaging device as described above, the deflection angle of light passing through the first lens can be effectively reduced, thereby reducing the sensitivity of the first lens.

[0065] On the other hand, an optical imaging device according to an embodiment of the present application includes a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, a sixth lens with a positive optical power, a seventh lens with a negative optical power, and an eighth lens with a negative optical power, which are arranged in sequence from the object side to the image side along the optical axis. A first spacer element that at least partially contacts the image side surface of the first lens is provided between the first lens and the second lens, a second spacer element that at least partially contacts the image side surface of the second lens is provided between the second lens and the third lens, a third spacer element that at least partially contacts the image side surface of the third lens is provided between the third lens and the fourth lens, a fourth spacer element that at least partially contacts the image side surface of the fourth lens is provided between the fourth lens and the fifth lens, a fifth spacer element that at least partially contacts the image side surface of the fifth lens is provided between the fifth lens and the sixth lens, a sixth spacer element that at least partially contacts the image side surface of the sixth lens is provided between the sixth lens and the seventh lens, and a seventh spacer element that at least partially contacts the image side surface of the seventh lens is provided between the seventh lens and the eighth lens. An air gap is provided on the optical axis between any two adjacent lenses among the first lens to the eighth lens. Among them, the air gap T78 on the optical axis between the seventh lens and the eighth lens is the maximum value of the air gaps on the optical axis between each adjacent two lenses; and, the air gap T78 on the optical axis between the seventh lens and the eighth lens and the sum ∑AT of the air gaps on the optical axis between each adjacent two lenses among the first lens to the eighth lens satisfy the conditional expression 0.4 < T78 / ∑AT < 0.5. By the above settings of the optical imaging device, the defocus amount of the entire field of view can be effectively controlled, and the system sensitivity can be reduced.

[0066] On another aspect, the optical imaging device according to the embodiments of this application includes a lens barrel and a lens group and a spacer element group assembled therein. The lens group includes a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, and an eighth lens with negative optical power, arranged sequentially along the optical axis from the object side to the image side. A first spacer element is provided between the first and second lenses, which at least partially contacts the image-side surface of the first lens; a second spacer element is provided between the second and third lenses, which at least partially contacts the image-side surface of the second lens; a third spacer element is provided between the third and fourth lenses, which at least partially contacts the image-side surface of the third lens; a fourth spacer element is provided between the fourth and fifth lenses, which at least partially contacts the image-side surface of the fourth lens; a fifth spacer element is provided between the fifth and sixth lenses, which at least partially contacts the image-side surface of the fifth lens; a sixth spacer element is provided between the sixth and seventh lenses, which at least partially contacts the image-side surface of the sixth lens; and a seventh spacer element is provided between the seventh and eighth lenses, which at least partially contacts the image-side surface of the seventh lens. The inner diameter d0m of the image-side end face of the lens barrel, the outer diameter D7m of the image-side surface of the seventh spacer element, and the effective focal length f8 of the eighth lens satisfy the condition -0.3≤(d0m-D7m) / f8≤-0.05. Through the above-described configuration of the optical imaging device, the lens dimensions can be effectively controlled, facilitating module assembly and reducing the module's size.

[0067] The optical imaging device provided according to the exemplary embodiments of this application adopts an eight-element lens architecture. Through the reasonable arrangement of each lens and each spacer element, the optical imaging device has a higher lens light intake, can balance various aberrations, has a lower lens sensitivity, is conducive to lens assembly, and has the characteristics of miniaturization, which can better meet people's increasingly high requirements for optical systems such as mobile phone lenses.

[0068] However, those skilled in the art will understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the optical imaging device can be changed, as can the number of spacers, to obtain the various results and advantages described in this specification, and this application does not specifically limit this. For example, although eight lenses are described as an example in the embodiments, the optical imaging device is not limited to including eight lenses. If necessary, the optical imaging device may also include other numbers of lenses. Furthermore, as needed, the optical imaging device may also include other numbers of spacers than those described in the above embodiments.

[0069] Specific embodiments of the optical imaging apparatus applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0070] Example 1

[0071] The following is for reference Figure 2 This application describes an optical imaging apparatus according to Embodiment 1.

[0072] like Figure 2 As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially along the optical axis from the object side to the image side.

[0073] In this embodiment, the optical imaging device further includes a plurality of spacer elements: a first spacer element P1, located between a first lens E1 and a second lens E2 and in at least partial contact with the image-side surface of the first lens E1; a second spacer element P2, located between a second lens E2 and a third lens E3 and in at least partial contact with the image-side surface of the second lens E2; a third spacer element P3, located between a third lens E3 and a fourth lens E4 and in at least partial contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between a fourth lens E4 and a fifth lens E5 and in at least partial contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between a fifth lens E5 and a sixth lens E6 and in at least partial contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between a sixth lens E6 and a seventh lens E7 and in at least partial contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between a seventh lens E7 and an eighth lens E8 and in at least partial contact with the image-side surface of the seventh lens E7.

[0074] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave.

[0075] Table 1 shows the basic parameters of the optical imaging device of Example 1, wherein the units of radius of curvature, thickness / distance and effective radius are all millimeters (mm).

[0076]

[0077] Table 1

[0078] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0079]

[0080] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Tables 2-1 and 2-2 below give the higher-order coefficients A4, A6, A8, A16, A27, A18, A19 ... 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0081] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.8530E-02 -3.7653E-02 6.9176E-03 1.0679E-03 -1.6267E-05 -1.9995E-04 -2.2183E-05 S2 -2.0501E-01 1.7441E-02 1.1881E-02 -2.1289E-03 1.3855E-04 -8.6378E-05 -4.8865E-05 S3 -7.8062E-02 3.6817E-02 1.7966E-03 -3.9286E-03 5.9713E-04 2.0193E-04 -8.4880E-05 S4 -1.2607E-01 -4.5243E-03 2.7328E-03 -7.9416E-04 7.5601E-04 -3.3772E-04 4.8543E-05 S5 -4.3395E-02 1.3871E-02 1.0513E-02 -9.1579E-04 -1.2130E-04 -4.9345E-04 1.9186E-04 S6 4.0512E-02 1.9364E-02 8.3720E-03 2.9688E-04 -3.6184E-04 -2.2217E-04 3.5522E-05 S7 -2.9566E-01 -1.3589E-02 1.2640E-02 3.0927E-03 5.6660E-04 -2.0657E-04 5.9001E-06 S8 -3.2835E-01 -5.1864E-02 1.4357E-02 -5.5804E-03 4.4222E-04 -6.2139E-04 5.5892E-04 S9 -3.7466E-01 -2.1563E-02 5.3714E-03 -1.2586E-02 1.4655E-03 -1.2268E-03 8.8954E-04 S10 -9.0878E-01 4.4159E-02 2.4135E-02 -5.4496E-03 8.2875E-03 8.2718E-04 1.4065E-03 S11 -2.9904E-01 -5.1587E-01 -1.0089E-02 2.6130E-02 2.9427E-02 2.1123E-02 6.4991E-03 S12 2.9778E-01 -4.9356E-01 7.8013E-02 3.3008E-02 -1.4832E-02 -7.5139E-04 -6.7472E-03 S13 -1.1929E+00 -3.9326E-01 3.7530E-01 -7.9390E-02 1.2118E-03 -2.5848E-02 8.0697E-03 S14 -1.4570E+00 -2.6475E-01 3.3102E-01 -1.1949E-01 3.7703E-02 -1.8915E-02 2.4505E-03 S15 -3.4868E+00 1.4527E+00 -5.2059E-01 1.6320E-01 -2.9289E-02 -1.1683E-02 7.4211E-03 S16 -4.1893E+00 8.8180E-01 -2.2677E-01 9.4313E-02 -1.3577E-03 5.3370E-03 -1.2369E-02

[0082] Table 2-1

[0083] Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 -2.3616E-03 -5.1336E-03 -2.9070E-03 -1.3025E-03 -3.7132E-05 1.0354E-04 2.2982E-06 S12 -6.2548E-03 2.6216E-03 2.7544E-03 1.8492E-03 3.4304E-04 -4.9969E-04 -2.6008E-04 S13 -2.9255E-03 3.9837E-04 9.5344E-04 1.4155E-03 -5.1143E-04 -1.0489E-03 -6.5082E-04 S14 -2.7297E-03 7.3314E-04 1.4241E-03 -1.9912E-03 -6.7960E-04 -6.6245E-04 4.7601E-04 S15 3.9841E-03 -4.2343E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S16 3.7777E-03 5.0358E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0084] Table 2-2

[0085] Example 2

[0086] The following is for reference Figure 3 Describes an optical imaging apparatus according to Embodiment 2 of this application.

[0087] like Figure 3As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially along the optical axis from the object side to the image side. The optical imaging device further includes a plurality of spacer elements: a first spacer element P1, located between a first lens E1 and a second lens E2 and in at least partial contact with the image-side surface of the first lens E1; a second spacer element P2, located between a second lens E2 and a third lens E3 and in at least partial contact with the image-side surface of the second lens E2; a third spacer element P3, located between a third lens E3 and a fourth lens E4 and in at least partial contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between a fourth lens E4 and a fifth lens E5 and in at least partial contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between a fifth lens E5 and a sixth lens E6 and in at least partial contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between a sixth lens E6 and a seventh lens E7 and in at least partial contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between a seventh lens E7 and an eighth lens E8 and in at least partial contact with the image-side surface of the seventh lens E7.

[0088] The basic parameter table of the optical imaging device in this embodiment is the same as that in Table 1, and the table of higher-order coefficients of the aspherical mirror is the same as that in Tables 2-1 and 2-2.

[0089] The difference between this embodiment and Embodiment 1 lies in the dimensional values ​​of some structural parameters of the spacer element and the lens barrel. The values ​​of various relevant structural parameters in this embodiment and Embodiment 1 are shown in Table 7 below. These parameters specifically include:

[0090] The inner diameter d1s of the object side surface of the first spacer P1, the inner diameter d1m of the image side surface of the first spacer P1, the outer diameter D1s of the object side surface of the first spacer P1, the inner diameter d2s of the object side surface of the second spacer P2, the inner diameter d3s of the object side surface of the third spacer P3, the inner diameter d4s of the object side surface of the fourth spacer P4, the outer diameter D4s of the object side surface of the fourth spacer P4, the inner diameter d5s of the object side surface of the fifth spacer P5, the inner diameter d6s of the object side surface of the sixth spacer P6, the inner diameter d7s of the object side surface of the seventh spacer P7, the inner diameter d7m of the image side surface of the seventh spacer P7, the outer diameter D7s of the object side surface of the seventh spacer P7, the inner diameter d0s of the object side end face of the lens tube P0, and the inner diameter d0m of the image side end face of the lens tube P0. The units for all parameters shown in Table 7 are millimeters (mm), and the schematic diagrams of the optical imaging device for each parameter can be found as follows: Figure 1 As shown.

[0091] Example 3

[0092] The following is for reference Figure 4 The optical lens according to Embodiment 3 of this application is described.

[0093] like Figure 4 As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially along the optical axis from the object side to the image side. The optical imaging device further includes a plurality of spacer elements: a first spacer element P1, located between a first lens E1 and a second lens E2 and in at least partial contact with the image-side surface of the first lens E1; a second spacer element P2, located between a second lens E2 and a third lens E3 and in at least partial contact with the image-side surface of the second lens E2; a third spacer element P3, located between a third lens E3 and a fourth lens E4 and in at least partial contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between a fourth lens E4 and a fifth lens E5 and in at least partial contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between a fifth lens E5 and a sixth lens E6 and in at least partial contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between a sixth lens E6 and a seventh lens E7 and in at least partial contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between a seventh lens E7 and an eighth lens E8 and in at least partial contact with the image-side surface of the seventh lens E7.

[0094] The basic parameter table of the optical imaging device in this embodiment is the same as that in Table 1, and the table of higher-order coefficients of the aspherical mirror is the same as that in Tables 2-1 and 2-2.

[0095] The difference between this embodiment and Embodiment 1 lies in the different dimensional values ​​of some related structural parameters of the spacer element and the lens barrel. The values ​​of each related structural parameter in this embodiment are also shown in Table 7 below. The specific descriptions of many parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0096] Figure 5 The on-axis chromatic aberration curves of the optical imaging devices of Embodiments 1, 2 and 3 are shown, which represent the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 6 Astigmatism curves of the optical imaging devices of Embodiments 1, 2 and 3 are shown, representing meridional image plane curvature and sagittal image plane curvature. Figure 7 The distortion curves of the optical imaging devices of Embodiments 1, 2, and 3 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 5 to 7It can be seen that the optical imaging devices given in Embodiments 1, 2 and 3 can achieve good imaging quality.

[0097] Example 4

[0098] The following is for reference Figure 8 The optical imaging apparatus according to Embodiment 4 of this application is described.

[0099] like Figure 8 As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially along the optical axis from the object side to the image side.

[0100] In this embodiment, the optical imaging device further includes a plurality of spacer elements: a first spacer element P1, located between a first lens E1 and a second lens E2 and in at least partial contact with the image-side surface of the first lens E1; a second spacer element P2, located between a second lens E2 and a third lens E3 and in at least partial contact with the image-side surface of the second lens E2; a third spacer element P3, located between a third lens E3 and a fourth lens E4 and in at least partial contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between a fourth lens E4 and a fifth lens E5 and in at least partial contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between a fifth lens E5 and a sixth lens E6 and in at least partial contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between a sixth lens E6 and a seventh lens E7 and in at least partial contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between a seventh lens E7 and an eighth lens E8 and in at least partial contact with the image-side surface of the seventh lens E7.

[0101] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave.

[0102] Table 3 shows the basic parameters of the optical imaging device of Example 4, where the units for radius of curvature, thickness / distance, and effective radius are all millimeters (mm).

[0103]

[0104]

[0105] Table 3

[0106] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. The shape of each aspherical surface can be defined by formula (1) given in embodiment 1 above. Tables 4-1 and 4-2 show the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror surface S1 to S16 in this embodiment. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0107] Face number A4 A6 A8 A10 A12 A14 A16 S1 -4.4851E-02 -3.8509E-02 7.8366E-03 1.1506E-03 -1.1961E-04 -2.4332E-04 -2.0973E-05 S2 -2.1299E-01 1.9945E-02 1.2957E-02 -2.6230E-03 1.0287E-04 -8.4676E-05 -5.1160E-05 S3 -7.9433E-02 3.9965E-02 1.1953E-03 -4.5218E-03 7.3922E-04 2.6626E-04 -1.1059E-04 S4 -1.3191E-01 -4.5320E-03 2.7737E-03 -7.6651E-04 7.7643E-04 -3.2504E-04 3.8735E-05 S5 -4.2472E-02 1.8626E-02 1.2060E-02 -9.9133E-04 -1.3172E-04 -4.4933E-04 1.8432E-04 S6 4.9161E-02 2.2539E-02 9.0980E-03 3.3089E-04 -3.0135E-04 -1.5647E-04 3.9641E-05 S7 -2.7282E-01 -1.6573E-02 9.8509E-03 2.5889E-03 4.4571E-04 -1.9719E-04 -2.6588E-05 S8 -3.0209E-01 -5.0252E-02 1.3992E-02 -4.4683E-03 4.8991E-04 -6.1275E-04 5.2066E-04 S9 -3.4548E-01 -1.8794E-02 7.9756E-03 -1.1614E-02 1.2618E-03 -1.3510E-03 9.1315E-04 S10 -8.9681E-01 3.6930E-02 2.3795E-02 -8.4347E-03 6.1857E-03 1.4216E-04 1.3333E-03 S11 -1.2589E-01 -4.5182E-01 -3.2129E-02 -2.9618E-03 5.1573E-03 9.5039E-03 6.3556E-03 S12 3.9902E-01 -4.5087E-01 3.7756E-02 3.1483E-02 -8.5035E-03 5.5000E-03 1.4733E-03 S13 -1.0267E+00 -4.6154E-01 3.4602E-01 -5.5522E-02 1.5106E-02 -1.9714E-02 6.4666E-03 S14 -1.2373E+00 -3.5027E-01 2.9730E-01 -1.0349E-01 3.8471E-02 -1.0773E-02 2.9473E-03 S15 -3.4814E+00 1.3397E+00 -4.4936E-01 1.2393E-01 -9.3297E-03 -1.3091E-02 3.7208E-03 S16 -4.0577E+00 8.2948E-01 -2.1103E-01 7.3893E-02 5.9735E-03 7.7534E-03 -1.1855E-02

[0108] Table 4-1

[0109]

[0110]

[0111] Table 4-2

[0112] Example 5

[0113] The following is for reference Figure 9 This application describes an optical imaging apparatus according to Embodiment 5.

[0114] like Figure 9As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially along the optical axis from the object side to the image side. The optical imaging device further includes a plurality of spacer elements: a first spacer element P1, located between a first lens E1 and a second lens E2 and in at least partial contact with the image-side surface of the first lens E1; a second spacer element P2, located between a second lens E2 and a third lens E3 and in at least partial contact with the image-side surface of the second lens E2; a third spacer element P3, located between a third lens E3 and a fourth lens E4 and in at least partial contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between a fourth lens E4 and a fifth lens E5 and in at least partial contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between a fifth lens E5 and a sixth lens E6 and in at least partial contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between a sixth lens E6 and a seventh lens E7 and in at least partial contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between a seventh lens E7 and an eighth lens E8 and in at least partial contact with the image-side surface of the seventh lens E7.

[0115] The basic parameter table of the optical imaging device in this embodiment is the same as that in Table 3, and the table of higher-order coefficients of the aspherical mirror is the same as that in Tables 4-1 and 4-2.

[0116] The difference between this embodiment and Embodiment 4 lies in the different dimensional values ​​of some related structural parameters of the spacer element and the lens barrel. The values ​​of each related structural parameter in this embodiment and Embodiment 4 are shown in Table 7 below. The specific descriptions of many parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0117] Example 6

[0118] The following is for reference Figure 10 The optical lens according to Embodiment 6 of this application is described.

[0119] like Figure 10As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially along the optical axis from the object side to the image side. The optical imaging device further includes a plurality of spacer elements: a first spacer element P1, located between a first lens E1 and a second lens E2 and in at least partial contact with the image-side surface of the first lens E1; a second spacer element P2, located between a second lens E2 and a third lens E3 and in at least partial contact with the image-side surface of the second lens E2; a third spacer element P3, located between a third lens E3 and a fourth lens E4 and in at least partial contact with the image-side surface of the third lens E3; a fourth spacer element P4, located between a fourth lens E4 and a fifth lens E5 and in at least partial contact with the image-side surface of the fourth lens E4; a fifth spacer element P5, located between a fifth lens E5 and a sixth lens E6 and in at least partial contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between a sixth lens E6 and a seventh lens E7 and in at least partial contact with the image-side surface of the sixth lens E6; and a seventh spacer element P7, located between a seventh lens E7 and an eighth lens E8 and in at least partial contact with the image-side surface of the seventh lens E7.

[0120] The basic parameter table of the optical imaging device in this embodiment is the same as that in Table 3, and the table of higher-order coefficients of the aspherical mirror is the same as that in Tables 4-1 and 4-2.

[0121] The difference between this embodiment and embodiment 4 lies in the different dimensional values ​​of some related structural parameters of the spacer element and the lens barrel. The values ​​of each related structural parameter in this embodiment are shown in Table 7 below, and the specific descriptions of many parameters are the same as those in embodiment 2 above, and will not be repeated here.

[0122] Figure 11 The on-axis chromatic aberration curves of the optical imaging devices of Embodiments 4, 5 and 6 are shown, which represent the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 12 Astigmatism curves of the optical imaging devices of Embodiments 4, 5 and 6 are shown, representing meridional image plane curvature and sagittal image plane curvature. Figure 13 The distortion curves of the optical imaging devices of Embodiments 4, 5, and 6 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 11 to 13 It can be seen that the optical imaging devices given in Examples 4, 5 and 6 can achieve good imaging quality.

[0123] Example 7

[0124] The following is for reference Figure 14The optical imaging apparatus according to Embodiment 7 of this application is described.

[0125] like Figure 14 As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially along the optical axis from the object side to the image side.

[0126] In this embodiment, the optical imaging device further includes a plurality of spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and in at least partial contact with the image-side surface of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and in at least partial contact with the image-side surface of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and in at least partial contact with the image-side surface of the third lens E3; and a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth lens E4. At least partially in contact; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in at least partial contact with the image side of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in at least partial contact with the image side of the sixth lens E6; a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in at least partial contact with the image side of the seventh lens E7; and a seventh auxiliary spacer element P7b, located between the seventh spacer element P7 and the eighth lens E8 and in at least partial contact with the image side of the seventh spacer element P7.

[0127] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave.

[0128] Table 5 shows the basic parameters of the optical imaging device of Example 7, where the units for radius of curvature, thickness / distance, and effective radius are all millimeters (mm).

[0129]

[0130]

[0131] Table 5

[0132] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. The shape of each aspherical surface can be defined by formula (1) given in embodiment 1 above. Tables 6-1 and 6-2 show the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror surface S1 to S16 in this embodiment. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0133] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.4164E-02 -4.4712E-02 3.4232E-03 1.8179E-03 4.6718E-04 -8.8767E-05 -6.4248E-05 S2 -1.8111E-01 2.6853E-03 1.0904E-02 7.1692E-05 3.2157E-05 -6.0184E-05 -3.6792E-05 S3 -8.4311E-02 3.3006E-02 3.1475E-03 -2.4805E-03 -1.7035E-04 8.5530E-05 -3.6194E-06 S4 -8.9461E-02 -1.0349E-02 1.8486E-03 -1.2037E-04 2.5562E-04 -1.4563E-04 1.7183E-05 S5 -4.5937E-02 5.3281E-03 1.0242E-02 1.8544E-04 -3.3564E-04 -2.0620E-04 1.0338E-04 S6 1.5763E-02 1.6038E-02 7.6630E-03 -5.4707E-04 -5.0601E-04 -1.1351E-04 6.3788E-05 S7 -2.0578E-01 -1.0522E-02 9.3291E-03 -1.2502E-03 -1.9178E-04 -2.9362E-04 1.2025E-04 S8 -1.9479E-01 -5.8035E-02 1.1710E-02 -4.4099E-03 1.2334E-03 -2.7471E-04 4.2818E-04 S9 -2.7612E-01 -4.7911E-02 8.5997E-03 -8.8555E-03 9.3631E-04 -9.0308E-04 2.5639E-04 S10 -7.2341E-01 5.4765E-02 3.1372E-02 -6.0706E-03 3.1949E-03 1.4804E-04 1.4085E-04 S11 -1.9768E-01 -4.2895E-01 -9.0744E-03 8.2291E-05 -3.2020E-03 7.2758E-03 2.5448E-03 S12 4.8277E-01 -5.2532E-01 9.0422E-02 -3.2100E-03 -2.1456E-02 8.8220E-03 -1.7253E-03 S13 -1.0345E+00 -4.6602E-01 3.5193E-01 -9.4619E-02 4.4608E-02 -2.5563E-02 4.1524E-03 S14 -1.2626E+00 -4.7556E-01 2.9609E-01 -1.1689E-01 5.7487E-02 -1.5603E-02 8.2927E-03 S15 -3.9531E+00 1.6800E+00 -6.8367E-01 2.2982E-01 -6.3867E-02 2.9269E-02 -2.0850E-02 S16 -4.3348E+00 1.0029E+00 -2.8289E-01 1.0406E-01 -3.0073E-02 1.5829E-02 -2.2484E-02

[0134] Table 6-1

[0135]

[0136]

[0137] Table 6-2

[0138] Example 8

[0139] The following is for reference Figure 15 This application describes an optical imaging apparatus according to Embodiment 8.

[0140] like Figure 15As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially along the optical axis from the object side to the image side. The optical imaging device also includes multiple spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and at least partially in contact with the image side of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and at least partially in contact with the image side of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and at least partially in contact with the image side of the third lens E3; and a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and at least partially in contact with the image side of the fourth lens E4. Contact; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in at least partial contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in at least partial contact with the image-side surface of the sixth lens E6; a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in at least partial contact with the image-side surface of the seventh lens E7; and a seventh auxiliary spacer element P7b, located between the seventh spacer element P7 and the eighth lens E8 and in at least partial contact with the image-side surface of the seventh spacer element P7.

[0141] The basic parameter table of the optical imaging device in this embodiment is the same as that in Table 5, and the table of higher-order coefficients of the aspherical mirror is the same as that in Tables 6-1 and 6-2.

[0142] The difference between this embodiment and Embodiment 7 lies in the dimensional values ​​of some related structural parameters of the spacer element and the lens barrel. The values ​​of each related structural parameter in this embodiment and Embodiment 7 are shown in Table 7 below. The specific descriptions of many parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0143] Example 9

[0144] The following is for reference Figure 16 The optical lens according to Embodiment 9 of this application is described.

[0145] like Figure 16As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially along the optical axis from the object side to the image side. The optical imaging device also includes multiple spacer elements: a first spacer element P1, located between the first lens E1 and the second lens E2 and at least partially in contact with the image side of the first lens E1; a second spacer element P2, located between the second lens E2 and the third lens E3 and at least partially in contact with the image side of the second lens E2; a third spacer element P3, located between the third lens E3 and the fourth lens E4 and at least partially in contact with the image side of the third lens E3; and a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and at least partially in contact with the image side of the fourth lens E4. Contact; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and in at least partial contact with the image-side surface of the fifth lens E5; a sixth spacer element P6, located between the sixth lens E6 and the seventh lens E7 and in at least partial contact with the image-side surface of the sixth lens E6; a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and in at least partial contact with the image-side surface of the seventh lens E7; and a seventh auxiliary spacer element P7b, located between the seventh spacer element P7 and the eighth lens E8 and in at least partial contact with the image-side surface of the seventh spacer element P7.

[0146] The basic parameter table of the optical imaging device in this embodiment is the same as that in Table 5, and the table of higher-order coefficients of the aspherical mirror is the same as that in Tables 6-1 and 6-2.

[0147] The difference between this embodiment and Embodiment 7 lies in the different dimensional values ​​of some related structural parameters of the spacer element and the lens barrel. The values ​​of each related structural parameter in this embodiment are shown in Table 7 below. The specific descriptions of many parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0148] Figure 17 The on-axis chromatic aberration curves of the optical imaging devices of Embodiments 7, 8 and 9 are shown, which represent the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 18 Astigmatism curves of the optical imaging devices of Embodiments 7, 8 and 9 are shown, representing meridional image plane curvature and sagittal image plane curvature. Figure 19 The distortion curves of the optical imaging devices of Embodiments 7, 8, and 9 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 17 to 19 It can be seen that the optical imaging devices given in Examples 7, 8 and 9 can achieve good imaging quality.

[0149] Parameters / Examples Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 d1s 4.370 4.364 4.541 4.456 4.530 4.456 4.507 4.388 4.388 d1m 4.370 4.364 4.541 4.456 4.530 4.456 4.507 4.388 4.388 D1s 7.410 7.514 7.580 7.483 7.759 7.660 7.744 6.179 6.179 d2s 4.421 4.437 4.421 4.518 4.518 4.696 4.406 4.391 4.372 d3s 4.549 4.549 4.720 4.619 4.821 4.619 4.564 4.453 4.510 d4s 4.843 4.851 4.843 4.999 4.999 5.176 4.896 4.723 4.728 D4s 8.900 8.951 9.070 8.972 9.174 9.150 9.234 8.977 9.203 d5s 5.999 5.900 6.169 5.868 6.112 6.022 5.778 5.778 5.946 d6s 7.503 7.555 7.503 7.607 7.609 7.785 7.726 7.726 7.953 d7s 9.584 9.716 9.209 9.155 9.357 9.155 9.772 8.764 8.876 d7m 9.584 9.716 9.209 9.155 9.357 9.155 9.772 8.764 8.876 D7s 11.900 12.032 11.900 11.972 12.174 12.272 11.506 11.185 11.264 D7m 11.900 12.032 11.900 11.972 12.174 12.272 11.506 11.185 11.264 d0s 6.327 6.327 6.327 6.320 6.399 6.399 6.404 6.404 6.404 d0m 12.934 12.934 12.934 13.007 13.007 13.007 13.011 13.011 13.011

[0150] Table 7

[0151] Furthermore, in Examples 1 to 9, the effective focal length f of the optical imaging device, the aperture number FNO of the optical imaging device, and the effective focal length values ​​f1 to f8 of the first lens to the eighth lens are shown in Table 8 below.

[0152] Parameters / Examples Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 f(mm) 6.55 6.55 6.55 6.66 6.66 6.66 7.12 7.12 7.12 FNO 1.50 1.50 1.50 1.50 1.50 1.50 1.60 1.60 1.60 f1(mm) 19.23 19.23 19.23 20.31 20.31 20.31 14.78 14.78 14.78 f2 (mm) 9.75 9.75 9.75 9.92 9.92 9.92 11.08 11.08 11.08 f3 (mm) -17.64 -17.64 -17.64 -17.54 -17.54 -17.54 -17.80 -17.80 -17.80 f4 (mm) 33.41 33.41 33.41 34.79 34.79 34.79 37.78 37.78 37.78 f5 (mm) -15.91 -15.91 -15.91 -16.63 -16.63 -16.63 -16.53 -16.53 -16.53 f6 (mm) 7.43 7.43 7.43 7.62 7.62 7.62 7.77 7.77 7.77 f7 (mm) -52.75 -52.75 -52.75 -56.42 -56.42 -56.42 -44.37 -44.37 -44.37 f8(mm) -10.07 -10.07 -10.07 -10.85 -10.85 -10.85 -7.30 -7.30 -7.30

[0153] Table 8 shows that Examples 1 to 9 satisfy the conditions shown in Table 9 below.

[0154]

[0155]

[0156] Table 9

[0157] This application also provides an imaging device equipped with an electronic photosensitive element for imaging. The electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) device. The imaging 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. This imaging device is equipped with the optical imaging device described above.

[0158] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of protection involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the concept of this application. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging device, characterized by, Includes lens group and spacer element group, The lens group comprises, in sequence along the optical axis from the object side to the image side: a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, and an eighth lens with negative optical power. The spacer element group includes: a first spacer element located between the first lens and the second lens and at least partially in contact with the image-side surface of the first lens; a second spacer element located between the second lens and the third lens and at least partially in contact with the image-side surface of the second lens; a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image-side surface of the third lens; a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image-side surface of the fourth lens; a fifth spacer element located between the fifth lens and the sixth lens and at least partially in contact with the image-side surface of the fifth lens; a sixth spacer element located between the sixth lens and the seventh lens and at least partially in contact with the image-side surface of the sixth lens; and a seventh spacer element located between the seventh lens and the eighth lens and at least partially in contact with the image-side surface of the seventh lens; and The optical imaging device satisfies: 4.5≤f1 / (D1s-d1s)≤8.3 -26.0≤f7 / (D7s-d7s)≤-18.0, 0.99 <DT11 / DT21<1.05, Wherein, f1 is the effective focal length of the first lens, D1s is the outer diameter of the object side of the first spacer element, d1s is the inner diameter of the object side of the first spacer element, f7 is the effective focal length of the seventh lens, D7s is the outer diameter of the object side of the seventh spacer element, d7s is the inner diameter of the object side of the seventh spacer element, DT11 is the maximum effective radius of the object side of the first lens, and DT21 is the maximum effective radius of the object side of the second lens.

2. The optical imaging device of claim 1, wherein, The inner diameter d7m of the image-side surface of the seventh spacer element, the radius of curvature R15 of the object-side surface of the eighth lens, and the inner diameter d7s of the object-side surface of the seventh spacer element and the radius of curvature R14 of the image-side surface of the seventh lens satisfy the following: 5.5≤d7m / R15+d7s / R14≤6.

7.

3. The optical imaging device of claim 1, wherein, The optical imaging device further includes a lens barrel, in which the lens group and the spacer element group are assembled; The inner diameter d0m of the image-side end face of the lens barrel, the outer diameter D7m of the image-side surface of the seventh spacer element, and the effective focal length f8 of the eighth lens satisfy the following: -0.3≤(d0m-D7m) / f8≤-0.

05.

4. The optical imaging device of claim 1, wherein, Along the optical axis, there is an air gap between any two adjacent lenses from the first lens to the eighth lens, wherein the air gap T78 between the seventh lens and the eighth lens on the optical axis is the maximum value among the air gaps between any two adjacent lenses on the optical axis; The air gap T78 between the seventh lens and the eighth lens on the optical axis and the sum of the air gaps ∑AT between any two adjacent lenses from the first lens to the eighth lens on the optical axis satisfy the following: 0.4 <T78 / ∑AT<0.5。 5. The optical imaging device of claim 1, wherein, The inner diameter d7s of the object side surface of the seventh spacer element, the inner diameter d6s of the object side surface of the sixth spacer element, and the center thickness CT7 of the seventh lens on the optical axis satisfy the following: 2.4≤(d7s-d6s) / CT7≤5.

5.

6. The optical imaging device of claim 1, wherein, The optical imaging device further includes a lens barrel, in which the lens group and the spacer element group are assembled; The inner diameter d0s of the object-side end face of the lens barrel, the inner diameter d1s of the object-side surface of the first spacer element, the center thickness CT1 of the first lens on the optical axis, and the refractive index N1 of the first lens satisfy the following: 1.65≤(d0s-d1s) / (CT1×N1)≤2.

7. The optical imaging device according to claim 1, characterized in that, The inner diameter d1m of the image-side surface of the first spacer element, the radius of curvature R3 of the object-side surface of the second lens, the inner diameter d2s of the object-side surface of the second spacer element, and the radius of curvature R4 of the image-side surface of the second lens satisfy the following: 0.7≤d1m / R3-d2s / R4≤0.

9.

8. The optical imaging device according to claim 1, characterized in that, The inner diameter of each spacer element, from the third spacer element to the seventh spacer element, increases sequentially.

9. The optical imaging device according to claim 1, characterized in that, The inner diameter dis of the object side surface of the i-th spacer in the spacer group and the inner diameter d(i+1)s of the object side surface of the (i+1)-th spacer satisfy the following: 1≤d(i+1)s / dis≤1.4, where i=3,4,5 or6.

10. The optical imaging device according to claim 1, characterized in that, Of the first to the seventh spacer elements, the fourth spacer element has the largest toroidal area. The outer diameter D4s of the object side surface of the fourth spacer element, the inner diameter d4s of the object side surface of the fourth spacer element, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy the following: 10.6≤(D4s-d4s) / T45≤15.7.

Images