Optical imaging device

Abstract

The utility model discloses an optical imaging device, the optical imaging device comprises a lens barrel, a lens group and a spacing element group, the lens group and the spacing element group are assembled in the lens barrel, the lens group comprises a first lens, a second lens, a third lens, a fourth lens and an eighth lens which are sequentially arranged from an object side to an image side along an optical axis, and an air gap is formed between every two adjacent lenses on the optical axis; the spacing element group comprises a first spacing element positioned between the first lens and the second lens and contacted with the image side surface of the first lens; the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging device satisfy 1.6 lt; f1 / flt; 3; the aperture value fno of the optical imaging device is not less than 1.50 and not more than fnolt; 1.6); the distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacing element on the optical axis, the center thickness CT1 of the first lens on the optical axis and the refractive index N1 of the first lens satisfy 0.75 lt; eP01 / (CT1 * N1) lt; and 1.4.

Description

Technical Field

[0001] This application relates to the field of optical elements, and more particularly, to an optical imaging device. Background Art

[0002] With the continuous development of mobile phone lenses, multi-piece large-aperture lenses have gradually become the future development trend. Based on this, those skilled in the art are committed to researching and designing an eight-piece optical lens with high light input, enabling it to balance various aberrations, reduce the intensity and range of ghost images, lower lens sensitivity, and have the characteristics of miniaturization, so as to better meet the increasingly high requirements of people for optical systems such as mobile phone lenses. Summary of the Utility Model

[0003] This application provides an optical imaging device, which may include a lens barrel and a lens group and a spacer element group assembled in the lens barrel. The lens group includes 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 arranged in sequence from the object side to the image side along the optical axis; there are air gaps on the optical axis between any two adjacent lenses from the first lens to the eighth lens; the spacer element group includes 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; the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging device may satisfy 1.6 < f1 / f < 3; the aperture value fno of the optical imaging device may satisfy 1.50 ≤ fno < 1.6; the distance EP01 on the optical axis from the object side end surface of the lens barrel to the object side surface of the first spacer element and the center thickness CT1 of the first lens on the optical axis and the refractive index N1 of the first lens may satisfy 0.75 < EP01 / (CT1×N1) < 1.4.

[0004] In one embodiment, the spacer element group may further include 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. The outer diameter D2s of the object side surface of the second spacer element, the outer diameter D1m of the image side surface of the first spacer element, and the effective focal length f2 of the second lens may satisfy: 0.01 ≤ (D2s - D1m) / f2 ≤ 0.05.

[0005] In one embodiment, the spacer element group may further include 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. The distance EP12 on the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element, the effective focal length f2 of the second lens, and the Abbe number V2 of the second lens may satisfy: 1.95 < EP12 / f2×V2 < 4.

[0006] In one embodiment, among the center thicknesses of the first to eighth lenses on the optical axis, the center thickness CT3 of the third lens on the optical axis is the smallest; the center thickness CT2 of the second lens on the optical axis and the center thickness CT3 of the third lens on the optical axis may satisfy: 1.65 <CT2 / CT3<1.85。

[0007] In one embodiment, the spacer element group may further include 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, and 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; the distance EP23 on the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element, the center thickness CT3 of the third lens on the optical axis, the distance EP12 on the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element, and the center thickness CT2 of the second lens on the optical axis may satisfy: 0.65 <EP23 / CT3-EP12 / CT2<1.6。

[0008] In one embodiment, the spacer element group may further include 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, and 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; the distance EP34 on the optical axis from the image side surface of the third spacer element to the object side surface of the fourth spacer element and the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens may satisfy: -0.2 <EP34 / (R7+R8)<0.02。

[0009] In one embodiment, the spacer element group may further include 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, and 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; the distance EP45 on the optical axis from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element, the distance EP56 on the optical axis from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens may satisfy: 3.15 <EP45 / EP56-f4 / f5<3.65。

[0010] In one embodiment, the spacer element group may further include 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, and 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; the inner diameter d6s of the object side surface of the sixth spacer element, the inner diameter d5m of the image side surface of the fifth spacer element, the inner diameter d5s of the object side surface of the fifth spacer element, and the inner diameter d4m of the image side surface of the fourth spacer element may satisfy: 1<(d6s-d5m) / (d5s-d4m)<2.65.

[0011] In one embodiment, the spacer element group may further include 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, and 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; the inner diameter d5m of the image side surface of the fifth spacer element, the curvature radius R11 of the object side surface of the sixth lens, the inner diameter d6s of the object side surface of the sixth spacer element, and the curvature radius R12 of the image side surface of the sixth lens may satisfy: 1 <d5m / R11-d6s / R12<1.85。

[0012] In one embodiment, the spacer element group may further include 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; a distance EP67 on the optical axis from the image side surface of the sixth spacer element to the object side surface of the seventh spacer element, an inner diameter d7s of the object side surface of the seventh spacer element, and an inner diameter d6s of the object side surface of the sixth spacer element may satisfy: 0.2 <EP67 / (d7s-d6s)<0.55。

[0013] In one embodiment, the spacer element group may further include 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; the sum of the air gaps ∑ET on the optical axis between each adjacent two spacer elements from the first to the seventh spacer elements and the sum of the center thicknesses ∑CT on the optical axis of each lens from the first to the eighth lenses may satisfy: 0.7<∑ET / ∑CT<1.

[0014] The optical imaging device according to an embodiment of the present application includes a lens barrel and a lens group and a spacer element group assembled therein. The lens group includes 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 arranged in sequence from the object side to the image side along the optical axis. There are air gaps on the optical axis between any two adjacent lenses from the first lens to the eighth lens. The spacer element group includes 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. The effective focal length f1 of the first lens and the total effective focal length f of the optical imaging device satisfy the conditional formula 1.6 < f1 / f < 3. The aperture value fno of the optical imaging device satisfies 1.50 ≤ fno < 1.6. The distance EP01 on the optical axis from the object side end face of the lens barrel to the object side surface of the first spacer element, the central thickness CT1 of the first lens on the optical axis, and the refractive index N1 of the first lens satisfy the conditional formula 0.75 < EP01 / (CT1×N1) < 1.4. The eight-piece large-aperture optical imaging device according to an embodiment of the present application satisfies the conditional formula 1.6 < f1 / f < 3. The diopter of the first lens is relatively large, and there will be a problem of large light ray refraction at the first lens. At the same time, the aperture of the system is very large, and a large amount of light passes through the first lens with a large diopter, which is easy to generate multiple total reflections inside the first lens, resulting in ghost images and stray light. Controlling the distance EP01 from the object side end face of the lens barrel to the object side surface of the first spacer element, the central thickness CT1, and the refractive index N1 of the first lens to satisfy the conditional formula 0.75 < EP01 / (CT1×N1) < 1.4 can effectively control the surface shapes on both sides of the first lens, maintain a relatively small lens opening angle, which is beneficial to weakening the intensity of total reflection ghost images of multiple reflections inside the first lens. With a low-reflection film layer, the intensity of ghost images on the actual shooting screen can be weakened. And it can effectively maintain a large light passing aperture, ensuring that the optical imaging device has a large light input amount. Even at night or under low-light conditions, a better imaging effect can still be obtained. With a larger-sized chip, a clearer shooting image quality performance can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] With reference to the accompanying drawings, through the following detailed description of non-limiting embodiments, other features, objectives, and advantages of the present application will become more apparent. In the drawings:

[0016] Figure 1 The structure and related parameter schematic diagram of an optical imaging device according to an exemplary embodiment of the present application are shown;

[0017] Figure 2 The structural schematic diagram of an optical imaging device according to Embodiment 1 of the present application is shown;

[0018] Figure 3 The structural schematic diagram of an optical imaging device according to Embodiment 2 of the present application is shown;

[0019] Figure 4 1 shows a schematic structural diagram of an optical imaging device according to Example 3 of the present application;

[0020] Figures 5 to 7 The figures show the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging devices according to Examples 1, 2, and 3 of the present application;

[0021] Figure 8 1 shows a schematic structural diagram of an optical imaging device according to Example 4 of the present application;

[0022] Figure 9 1 shows a schematic structural diagram of an optical imaging device according to Example 5 of the present application;

[0023] Figure 10 1 shows a schematic structural diagram of an optical imaging device according to Example 6 of the present application;

[0024] Figures 11 to 13 The figures show the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging devices according to Examples 4, 5, and 6 of the present application;

[0025] Figure 14 1 shows a schematic structural diagram of an optical imaging device according to Example 7 of the present application;

[0026] Figure 15 1 shows a schematic structural diagram of an optical imaging device according to Example 8 of the present application;

[0027] Figure 16 shows a schematic structural diagram of an optical imaging device according to Example 9 of the present application; and

[0028] Figures 17 to 19 axial chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging devices according to Examples 7, 8, and 9 of the present application are shown;

[0029] Figure 20 A schematic diagram of a light spot of the optical imaging device is shown when the conditional formula EP01 / (CT1×N1)=0.78 is satisfied;

[0030] Figure 21 shows a schematic diagram of a light spot of the optical imaging device when the conditional formula EP01 / (CT1×N1)=1.42 is satisfied; and

[0031] Figure 22 A schematic diagram of a light spot of an optical imaging device is shown when the conditional expression EP01 / (CT1×N1)=0.53 is satisfied. DETAILED DESCRIPTION

[0032] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present 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.

[0033] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0034] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0035] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be judged according to the general method in this field, for example, the positive and negative R value (R refers to the curvature radius of the paraxial area) is used to judge the convexity. In this article, the surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens. In terms of the object side, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; in terms of the image side, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex.

[0036] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0037] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0038] It should be noted that, without conflict, the embodiments and features in the embodiments of this application may be combined with each other. The following embodiments only express several implementation manners of this application, and their descriptions are relatively specific and detailed, but should not be construed as a limitation on the patent scope of this application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several deformations and improvements can be made, and these all belong to the protection scope of this application. The following will describe this application in detail with reference to the drawings and in combination with the embodiments.

[0039] The features, principles and other aspects of this application are described in detail below.

[0040] The optical imaging device according to an exemplary embodiment of this application may include a lens barrel and a lens group and a spacer element group assembled in the lens barrel. The lens group may be an eight-piece 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 lens to the eighth lens may be arranged in sequence from the object side to the image side along the optical axis, for example.

[0041] In the exemplary embodiment, there may be an air gap on the optical axis between any two adjacent lenses among the first lens to the eighth lens, respectively.

[0042] In the 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.

[0043] In the exemplary embodiment, 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 may have 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 ring surface and an inner ring surface, and its inner ring surface may be stepped, for example, to facilitate the assembly and accommodation of the lenses and the spacer elements arranged in sequence, etc.

[0044] In the exemplary embodiment, the optical imaging device of this application may satisfy the conditional formula 1.6 < f1 / f < 3, where f1 is the effective focal length of the first lens and f is the total effective focal length of the optical imaging device. More specifically, f1 and f may further satisfy: 1.65 < f1 / f < 2.95.

[0045] In an exemplary embodiment, the optical imaging device of the present application may satisfy the conditional formula 1.50 ≤ fno < 1.6, where fno is the aperture value of the optical imaging device. More specifically, fno may further satisfy 1.50 ≤ fno ≤ 1.55.

[0046] In an exemplary embodiment, the optical imaging device of the present application may satisfy the conditional formula 0.75 < EP01 / (CT1 × N1) < 1.4, where EP01 is the distance on the optical axis from the object-side end face of the lens barrel to 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. More specifically, EP01, CT1, and N1 may further satisfy 0.79 ≤ EP01 / (CT1 × N1) ≤ 1.35.

[0047] The optical imaging device according to an exemplary embodiment of the present application includes a lens barrel and a lens group and a spacer element group assembled therein. The lens group includes 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 arranged in sequence from the object side to the image side along the optical axis; there are air gaps on the optical axis between any two adjacent lenses among the first lens to the eighth lens; the spacer element group includes 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; the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging device satisfy the conditional formula 1.6 < f1 / f < 3; the aperture value fno of the optical imaging device satisfies 1.50 ≤ fno < 1.6; the distance EP01 on the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element, the central thickness CT1 of the first lens on the optical axis, and the refractive index N1 of the first lens satisfy the conditional formula 0.75 < EP01 / (CT1 × N1) < 1.4. The eight-piece large-aperture optical imaging device according to an embodiment of the present application satisfies the conditional formula 1.6 < f1 / f < 3. The diopter of the first lens is relatively large, and there will be a problem of large light turning at the first lens. At the same time, the aperture of the system is very large, and a large amount of light passes through the first lens with a large diopter, which is likely to cause multiple total reflections inside the first lens, thereby generating ghost images and stray light. Controlling the distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first spacer element, the central thickness CT1 of the first lens, and the refractive index N1 to satisfy the conditional formula 0.75 < EP01 / (CT1 × N1) < 1.4 can effectively control the surface shapes on both sides of the first lens, making it maintain a relatively small lens opening angle, which is beneficial to weakening the intensity of total reflection ghost images of multiple reflections inside the first lens. With a low-reflection film layer, the intensity of ghost images on the actual shooting screen can be weakened; and it can effectively maintain a large light passing aperture, ensuring that the optical imaging device has a large light input amount. Even at night or under low-light conditions, a better imaging effect can still be obtained. With a larger-sized chip, a clearer shooting picture quality performance can be achieved.

[0048] See Figures 20 to 22 , where Figure 20 shows a spot diagram of the optical imaging device in Solution 1 when the condition EP01 / (CT1×N1) = 0.78 is satisfied; Figure 21 shows a spot diagram of the optical imaging device in Solution 2 when the condition EP01 / (CT1×N1) = 1.42 is satisfied; Figure 22 shows a spot diagram of the optical imaging device in Solution 3 when the condition EP01 / (CT1×N1) = 0.53 is satisfied. Comparing Solution 1, Solution 2 and Solution 3, it can be seen that when the distance EP01 on the optical axis from the object-side end face of the lens barrel to the object-side surface of the first spacer element, the central thickness CT1 of the first lens on the optical axis and the value of the conditional formula EP01 / (CT1×N1) of the refractive index N1 of the first lens are within the range greater than 0.75 and less than 1.4, for example, the case of 0.78 in Solution 1, from the spot diagram of the optical imaging device at this time Figure 20 it can be seen that the design of the optical imaging device is relatively more reasonable, the ghost image intensity and range are relatively reasonable, the optical imaging device has better optical performance and can meet the design requirements; while when the value of the conditional formula EP01 / (CT1×N1) is not within the range greater than 0.75 and less than 1.4, for example, the case where its value is 1.42 in Solution 2, from the spot diagram of this solution Figure 21 it can be seen that at this time the optical performance of the optical imaging device is relatively poor, the ghost image range increases and is closer to the center of the picture, and the optical imaging device cannot meet the design requirements; for another example, the case where the value of EP01 / (CT1×N1) in Solution 3 is 0.53, from the spot diagram of this solution Figure 22 it can be seen that at this time the optical performance of the optical imaging device is also relatively poor, the ghost image intensity increases and the range increases, and the optical imaging device also cannot meet the design requirements. Therefore, the optical imaging device according to the embodiment of the present application, while satisfying the conditional formulas 1.6 < f1 / f < 3 and 1.50 ≤ fno < 1.6, can effectively control the shapes of both surfaces of the first lens by controlling EP01, CT1 and N1 to satisfy the conditional formula 0.75 < EP01 / (CT1×N1) < 1.4, so as to maintain a relatively small lens opening angle, which is beneficial to weakening the total reflection ghost image intensity of multiple reflections inside the first lens.配合低反射的膜层,可减弱实拍画面上的鬼影强度,同时还可以有效地维持较大的通光孔径,确保光学成像装置具有较大的进光量,即使在晚上或者暗光条件下,仍能够获得较佳的成像效果,配合较大尺寸的芯片,可以实现更佳清晰的拍摄画质表现。

[0049] 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 or positive optical power. The eighth lens may have negative optical power.

[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 either concave or 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 either concave or convex, 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 spacer element group may further include a second spacer element positioned between the second lens and the third lens and at least partially in contact with the image-side surface of the second lens.

[0052] In an exemplary embodiment, the spacer element group may further include a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image-side surface of the third lens.

[0053] In an exemplary embodiment, the spacer element group may further include a fourth spacer element located between the fourth lens and the fifth lens and in at least partial contact with the image-side surface of the fourth lens.

[0054] In an exemplary embodiment, the spacer element group may further include a fifth spacer element located between the fifth lens and the sixth lens and in at least partial contact with the image-side surface of the fifth lens.

[0055] In an exemplary embodiment, the spacer element group may further include a sixth spacer element located between the sixth lens and the seventh lens and in at least partial contact with the image-side surface of the sixth lens.

[0056] In an exemplary embodiment, the spacer element group may further include a seventh spacer element located between the seventh lens and the eighth lens and in at least partial contact with the image-side surface of the seventh lens.

[0057] In an exemplary embodiment, the optical imaging device of the present application can satisfy the conditional formula 0.01 ≤ (D2s - D1m) / f2 ≤ 0.05, where D2s is the outer diameter of the object side of the second spacer element, D1m is the outer diameter of the image side of the first spacer element, and f2 is the effective focal length of the second lens. By controlling the optical imaging device to satisfy the conditional formula 0.01 ≤ (D2s - D1m) / f2 ≤ 0.05, the outer dimension of the front end of the lens can be effectively compressed, which is beneficial to reducing the module size, and further reducing the size of the front end of the camera, which is beneficial to the internal structure arrangement. More specifically, D2s, D1m, and f2 can further satisfy 0.0145 ≤ (D2s - D1m) / f2 ≤ 0.049.

[0058] In an exemplary embodiment, the optical imaging device of the present application can satisfy the conditional formula 1.95 < EP12 / f2 × V2 < 4, where EP12 is the distance on the optical axis from the image side of the first spacer element to the object side of the second spacer element, f2 is the effective focal length of the second lens, and V2 is the Abbe number of the second lens. By controlling the optical imaging device to satisfy the conditional formula 1.95 < EP12 / f2 × V2 < 4, the combined chromatic aberration of the first lens and the second lens can be effectively reduced, which is beneficial to improving the lens quality. More specifically, EP12, f2, and V2 can further satisfy 1.98 ≤ EP12 / f2 × V2 ≤ 3.99.

[0059] In an exemplary embodiment, among the central thicknesses of each of the first lens to the eighth lens on the optical axis, the central thickness CT3 of the third lens on the optical axis is the smallest; the central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy the conditional formula 1.65 < CT2 / CT3 < 1.85. By controlling the optical imaging device to satisfy this condition, the primary aberration of the system can be effectively reduced, and the performance of the lens can be improved. More specifically, CT2 and CT3 can further satisfy: 1.66 ≤ CT2 / CT3 ≤ 1.84.

[0060] In an exemplary embodiment, the optical imaging device of the present application can satisfy the conditional formula 0.65 < EP23 / CT3 - EP12 / CT2 < 1.6, where EP23 is the distance on the optical axis from the image side of the second spacer element to the object side of the third spacer element, CT3 is the central thickness of the third lens on the optical axis, EP12 is the distance on the optical axis from the image side of the first spacer element to the object side of the second spacer element, and CT2 is the central thickness of the second lens on the optical axis. By controlling the optical imaging device to satisfy the conditional formula 0.65 < EP23 / CT3 - EP12 / CT2 < 1.6, the aberration of the combined lens group of the second lens and the third lens can be effectively controlled, and the lens quality can be improved. More specifically, EP23, CT3, EP12, and CT2 can further satisfy: 0.66 ≤ EP23 / CT3 - EP12 / CT2 ≤ 1.59.

[0061] In an exemplary embodiment, the optical imaging device of the present application can satisfy the conditional formula -0.2 < EP34 / (R7 + R8) < 0.02, where EP34 is the distance on the optical axis from the image side of the third spacer element to the object side of the fourth spacer element, R7 is the radius of curvature of the object side of the fourth lens, and R8 is the radius of curvature of the image side of the fourth lens. By controlling the optical imaging device to satisfy the conditional formula -0.2 < EP34 / (R7 + R8) < 0.02, the focal length of the fourth lens can be effectively controlled, and then the total system length can be controlled, which is beneficial to reducing the module size. More specifically, EP34, R7, and R8 can further satisfy: -0.19 ≤ EP34 / (R7 + R8) ≤ 0.01.

[0062] In an exemplary embodiment, the optical imaging device of the present application can satisfy the conditional formula 3.15 < EP45 / EP56 - f4 / f5 < 3.65, where EP45 is the distance on the optical axis from the image side of the fourth spacer element to the object side of the fifth spacer element, EP56 is the distance on the optical axis from the image side of the fifth spacer element to the object side of the sixth spacer element, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens. By controlling the optical imaging device to satisfy the conditional formula 3.15 < EP45 / EP56 - f4 / f5 < 3.65, the optical power of the system can be effectively and reasonably distributed, which is beneficial to reducing the sensitivity of the fourth lens and the fifth lens. More specifically, EP45, EP56, f4, and f5 can further satisfy: 3.19 ≤ EP45 / EP56 - f4 / f5 ≤ 3.64.

[0063] In an exemplary embodiment, the optical imaging device of the present application can satisfy the conditional formula 1 < (d6s - d5m) / (d5s - d4m) < 2.65, where d6s is the inner diameter of the object side of the sixth spacer element, d5m is the inner diameter of the image side of the fifth spacer element, d5s is the inner diameter of the object side of the fifth spacer element, and d4m is the inner diameter of the image side of the fourth spacer element. By controlling the optical imaging device to satisfy the conditional formula 1 < (d6s - d5m) / (d5s - d4m) < 2.65, the height of the light passing through the fifth lens to the sixth lens can be effectively reduced, and part of the stray light reflected from the flanges of the fifth lens and the sixth lens into the system can be eliminated. More specifically, d6s, d5m, d5s, and d4m can further satisfy: 1.01 ≤ (d6s - d5m) / (d5s - d4m) ≤ 2.63.

[0064] In an exemplary embodiment, the optical imaging device of the present application can satisfy the conditional formula 1 < d5m / R11 - d6s / R12 < 1.85, where d5m is the inner diameter of the image side of the fifth spacer element, R11 is the curvature radius of the object side of the sixth lens, d6s is the inner diameter of the object side of the sixth spacer element, and R12 is the curvature radius of the image side of the sixth lens. By controlling the optical imaging device to satisfy the conditional formula 1 < d5m / R11 - d6s / R12 < 1.85, the off-axis light passing through the sixth lens can be effectively controlled, and the light in the flange part can be intercepted, thereby reducing stray light. More specifically, d5m, R11, d6s, and R12 can further satisfy: 1.02 ≤ d5m / R11 - d6s / R12 ≤ 1.80.

[0065] In an exemplary embodiment, the optical imaging device of the present application can satisfy the conditional formula 0.2 < EP67 / (d7s - d6s) < 0.55, where EP67 is the distance on the optical axis from the image side of the sixth spacer element to the object side of the seventh spacer element, d7s is the inner diameter of the object side of the seventh spacer element, and d6s is the inner diameter of the object side of the sixth spacer element. By controlling the optical imaging device to satisfy the conditional formula 0.2 < EP67 / (d7s - d6s) < 0.55, the focal length of the seventh lens can be effectively controlled, and the sensitivity of the seventh lens system can be reduced. More specifically, EP67, d7s, and d6s can further satisfy: 0.24 ≤ EP67 / (d7s - d6s) ≤ 0.52.

[0066] In an exemplary embodiment, the optical imaging device of the present application can satisfy the conditional formula 0.7 < ∑ET / ∑CT < 1, where ∑ET is the sum of the air gaps on the optical axis between every two adjacent spacer elements from the first spacer element to the seventh spacer element, and ∑CT is the sum of the central thicknesses of each lens on the optical axis from the first lens to the eighth lens. By controlling the optical imaging device to satisfy the conditional formula 0.7 < ∑ET / ∑CT < 1, the overall length of the system can be effectively controlled, and at the same time, reasonable optical powers can be allocated to each lens, maintaining a reasonable system structure and optimizing high-order aberrations. More specifically, ∑ET and ∑CT can further satisfy: 0.74 ≤ ∑ET / ∑CT ≤ 0.97.

[0067] In an exemplary embodiment, the optical imaging device of the present application can include at least one aperture stop. The aperture stop can restrict the light path and control the light intensity. The aperture stop can be set at an appropriate position of the optical imaging device. For example, the aperture stop can be set between the object side and the first lens.

[0068] In an exemplary embodiment, optionally, the above optical imaging device can further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0069] In an exemplary embodiment, one or more aspherical mirror surfaces may be provided on the object side surface and the image side surface of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens. The aspherical mirror surface has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. By using the aspherical mirror surface, it is possible to eliminate the aberration that occurs during imaging as much as possible, thereby improving the imaging quality.

[0070] On the one hand, an optical imaging device according to an embodiment of the present application includes a lens barrel and a lens group and a spacer element group assembled therein. The lens group includes the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens arranged in sequence from the object side to the image side along the optical axis; there are air gaps on the optical axis between any two adjacent lenses among the first lens to the eighth lens; the spacer element group includes 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; the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging device satisfy the conditional formula 1.6 < f1 / f < 3; the aperture value fno of the optical imaging device satisfies 1.50 ≤ fno < 1.6; the distance EP01 on the optical axis from the object side end surface of the lens barrel to the object side surface of the first spacer element, the central thickness CT1 of the first lens on the optical axis, and the refractive index N1 of the first lens satisfy the conditional formula 0.75 < EP01 / (CT1×N1) < 1.4. The eight-piece large-aperture optical imaging device according to the embodiment of the present application satisfies the conditional formula 1.6 < f1 / f < 3. The diopter of the first lens is relatively large, and there will be a problem that the light rays turn greatly at the first lens. At the same time, the aperture of the system is very large, and a large amount of light rays pass through the first lens with a large diopter, which is likely to cause multiple total reflections inside the first lens, thereby generating ghost images and stray light. Controlling the distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer element, the central thickness CT1, and the refractive index N1 of the first lens to satisfy the conditional formula 0.75 < EP01 / (CT1×N1) < 1.4 can effectively control the surface shapes on both sides of the first lens, making it maintain a relatively small lens opening angle, which is beneficial to weakening the intensity of the total reflection ghost image of the multiple reflections inside the first lens.配合低反射的膜层,可减弱实拍画面上的鬼影强度;并且可以有效地维持较大的通光孔径,确保光学成像装置具有较大的进光量,即使在晚上或者暗光条件下,仍能够获得较佳的成像效果,配合较大尺寸的芯片,可以实现更加清晰的拍摄画质表现。With a low-reflection film layer, the intensity of the ghost image on the actual shooting image can be weakened; and it can effectively maintain a large light transmission aperture, ensuring that the optical imaging device has a large light input amount. Even at night or under low-light conditions, a better imaging effect can still be obtained.配合较大尺寸的芯片,可以实现更加清晰的拍摄画质表现。Cooperating with a larger-sized chip, a clearer shooting image quality performance can be achieved.

[0071] On the other hand, the optical imaging device according to an embodiment of the present application includes a lens barrel and a lens group and a spacer element group assembled therein. The lens group includes 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 arranged in sequence from the object side to the image side along the optical axis; there are air gaps on the optical axis between any two adjacent lenses among the first lens to the eighth lens; the spacer element group includes 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, and 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; the distance EP12 on the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element satisfies the conditional formula 1.95 < EP12 / f2 × V2 < 4 with the effective focal length f2 and the Abbe number V2 of the second lens. By the above setting of the optical imaging device, the combined chromatic aberration of the first lens and the second lens can be effectively reduced, which is beneficial to improving the lens quality.

[0072] On the other hand, the optical imaging device according to an embodiment of the present application includes a lens barrel and a lens group and a spacer element group assembled therein. The lens group includes 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 arranged in sequence from the object side to the image side along the optical axis; there are air gaps on the optical axis between any two adjacent lenses among the first lens to the eighth lens; the spacer element group includes 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 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, and 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; the distance EP45 on the optical axis from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element and the distance EP56 on the optical axis from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element satisfy the conditional formula 3.15 < EP45 / EP56 - f4 / f5 < 3.65 with the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens. By the above setting of the optical imaging device, the optical power of the system can be effectively and reasonably distributed, which is beneficial to reducing the sensitivity of the fourth lens and the fifth lens.

[0073] On the other hand, according to an embodiment of the present application, an optical imaging device includes a lens barrel and a lens group and a spacer element group assembled therein, the lens group including 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 arranged in sequence from the object side to the image side along the optical axis; an air gap is respectively provided on the optical axis between any two adjacent lenses among the first lens to the eighth lens; 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, and a 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 third spacer element, a fourth spacer element located between the fourth and fifth lenses and at least partially in contact with the image side surface of the fourth lens, a fifth spacer element located between the fifth and sixth lenses and at least partially in contact with the image side surface of the fifth lens, a sixth spacer element located between the sixth and seventh lenses and at least partially in contact with the image side surface of the sixth lens, and a seventh spacer element located between the seventh and eighth lenses and at least partially in contact with the image side surface of the seventh lens; the sum of the air gaps ∑ET on the optical axis between each adjacent pair of spacer elements from the first to seventh spacer elements and the sum of the center thicknesses ∑CT on the optical axis of each lens from the first to eighth lenses satisfy the condition 0.7 < ∑ET / ∑CT < 1. By configuring the optical imaging device as described above, the total length of the system can be effectively controlled, while a reasonable optical power can be assigned to each lens, maintaining a reasonable system structure, and optimizing high-order aberrations.

[0074] The optical imaging device provided in accordance with the exemplary embodiment of the present application has an eight-piece lens structure, has a higher amount of light entering the lens, can balance various aberrations, effectively reduce the intensity of ghost images and reduce the range of ghost images, has 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.

[0075] However, those skilled in the art will appreciate that, without departing from the technical solutions claimed in this application, the number of lenses constituting the optical imaging device and the number of spacer elements can be varied to achieve the various results and advantages described in this specification, and this application does not impose specific limitations on 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 desired, the optical imaging device may also include other numbers of lenses. For another example, as needed, the optical imaging device may also include other numbers of spacer elements than those described in the above embodiments.

[0076] Specific embodiments of the optical imaging device applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0077] Example 1

[0078] The following reference Figure 2 Describe the optical imaging device according to Example 1 of the present application.

[0079] 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, which are arranged in sequence from the object side to the image side along the optical axis.

[0080] In this embodiment, the optical imaging device also includes a plurality of 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 surface 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 surface 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 surface of the third lens E3; 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 surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and at least partially in 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 at least partially in contact with the image side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and at least partially in contact with the image side surface of the seventh lens E7.

[0081] In this embodiment, the first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative focal power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive focal power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has negative focal power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative focal power, with its object-side surface S15 being convex and its image-side surface S16 being concave.

[0082] Table 1 shows the basic parameters of the optical imaging device of Example 1, wherein the units of the curvature radius, thickness / distance and effective radius are all millimeters (mm).

[0083]

[0084]

[0085] Table 1

[0086] In this embodiment, the object-side surface and the image-side surface of any lens among the first lens E1 to the eighth lens E8 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0087]

[0088] Wherein, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Tables 2-1 and 2-2 give the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75, A80, A59, A61, A76, A80, A90, A10, A11, A12, A13, A14, A15 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0089]

[0090]

[0091] Table 2-1

[0092] 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

[0093] Table 2-2

[0094] Example 2

[0095] The following reference Figure 3 Describe the optical imaging device according to Example 2 of the present application.

[0096] 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, which are arranged in sequence from the object side to the image side along the optical axis. The optical imaging device also includes a plurality of 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 surface 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 surface 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 surface of the third lens E3; 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 surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and at least partially in 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 at least partially in contact with the image side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and at least partially in contact with the image side surface of the seventh lens E7.

[0097] The basic parameter table of the optical imaging device of this embodiment is the same as Table 1, and the high-order coefficient table of the aspheric mirror is the same as Table 2-1 and Table 2-2.

[0098] The difference between this embodiment and embodiment 1 lies in the different dimensional values ​​of some structural parameters of the spacer element and the lens barrel. The values ​​of the relevant structural parameters in this embodiment and embodiment 1 are shown in Table 7 below. The multiple parameters specifically include:

[0099] The outer diameter D1m of the image side surface of the first spacer element P1, the outer diameter D2s of the object side surface of the second spacer element P2, the inner diameter d4s of the object side surface of the fourth spacer element P4, the inner diameter d5s of the object side surface of the fifth spacer element P5, the inner diameter d5m of the image side surface of the fifth spacer element P5, the inner diameter d6s of the object side surface of the sixth spacer element P6, the inner diameter d7s of the object side surface of the seventh spacer element P7, the distance EP01 on the optical axis from the object side end surface of the lens barrel P0 to the object side surface of the first spacer element P1, the distance EP02 on the optical axis from the image side surface of the first spacer element P1 to the object side surface of the second spacer element P2 The distance EP12 on the optical axis is the distance from the image side surface of the second spacing element P2 to the object side surface of the third spacing element P3, the distance EP23 on the optical axis is the distance EP34 on the optical axis is the distance from the image side surface of the third spacing element P3 to the object side surface of the fourth spacing element P4, the distance EP45 on the optical axis is the distance from the image side surface of the fourth spacing element P4 to the object side surface of the fifth spacing element P5, the distance EP56 on the optical axis is the distance from the image side surface of the fifth spacing element P5 to the object side surface of the sixth spacing element P6, and the distance EP67 on the optical axis is the distance from the image side surface of the sixth spacing element P6 to the object side surface of the seventh spacing element P7. The units of the numerical values ​​of the parameters shown in Table 7 are all millimeters (mm), and the schematic diagram of the parameters in the structural diagram of the optical imaging device can be shown as follows. Figure 1 shown.

[0100] Example 3

[0101] The following reference Figure 4 Describe the optical lens according to Example 3 of the present application.

[0102] like Figure 4As 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, which are arranged in sequence from the object side to the image side along the optical axis. The optical imaging device also includes a plurality of 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 surface 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 surface 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 surface of the third lens E3; 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 surface of the fourth lens E4; a fifth spacer element P5, located between the fifth lens E5 and the sixth lens E6 and at least partially in 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 at least partially in contact with the image side surface of the sixth lens E6; and a seventh spacer element P7, located between the seventh lens E7 and the eighth lens E8 and at least partially in contact with the image side surface of the seventh lens E7.

[0103] The basic parameter table of the optical imaging device of this embodiment is also the same as Table 1, and the high-order coefficient table of the aspheric mirror is also the same as Table 2-1 and Table 2-2.

[0104] This embodiment also differs from Example 1 in the dimensional values ​​of some relevant structural parameters of the spacer element and the lens barrel. The values ​​of the various relevant structural parameters of this embodiment are also shown in Table 7 below. The detailed descriptions of these parameters are the same as those in Example 2 above and are not repeated here.

[0105] Figure 5 The axial chromatic aberration curves of the optical imaging devices of Example 1, Example 2 and Example 3 are shown, which represent the deviation of the convergent focus of light of different wavelengths passing through the lens. Figure 6 Astigmatism curves of the optical imaging devices of Example 1, Example 2, and Example 3 are shown, which represent meridional image plane curvature and sagittal image plane curvature. Figure 7 The distortion curves of the optical imaging devices of Example 1, Example 2 and Example 3 are shown, which represent the distortion values ​​corresponding to different image heights. Figures 5 to 7 It can be seen that the optical imaging devices provided in Example 1, Example 2 and Example 3 can achieve good imaging quality.

[0106] Example 4

[0107] The following reference Figure 8 Describe the optical imaging device according to Example 4 of the present application.

[0108] 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, which are arranged in sequence from the object side to the image side along the optical axis.

[0109] 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; a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in at least partial contact with the image side surface of the fourth lens E5. The image side surface of the fifth lens E5 and the sixth lens E6 are at least partially in contact with the image side surface of the fifth lens E5; the sixth lens E6 is located between the sixth lens E6 and the seventh lens E7 and is at least partially in contact with the image side surface of the sixth lens E6; the seventh lens E7 is located between the seventh lens E7 and the eighth lens E8 and is at least partially in contact with the image side surface of the seventh lens E7; and the eighth lens E8 is located on the image side of the eighth lens E8 and is at least partially in contact with the image side surface of the eighth lens E8.

[0110] In this embodiment, the first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative focal power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive focal power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative focal power, with its object-side surface S15 being convex and its image-side surface S16 being concave.

[0111] Table 3 shows the basic parameters of the optical imaging device of Example 4, wherein the units of the curvature radius, thickness / distance and effective radius are all millimeters (mm).

[0112]

[0113] Table 3

[0114] In this embodiment, the object side surface and the image side surface of any lens among the first lens E1 to the eighth lens E8 are aspherical surfaces. The surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. Tables 4-1 and 4-2 show the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0115]

[0116]

[0117] Table 4-1

[0118] 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 3.2233E-02 -2.4800E-02 1.4667E-03 1.2955E-02 -1.3412E-02 7.7967E-03 -3.0844E-03 S12 6.3424E-02 -4.6449E-02 2.6622E-02 -1.2623E-02 5.1964E-03 -1.7649E-03 4.5479E-04 S13 1.6150E-02 -1.0627E-02 3.5788E-03 -1.6578E-03 6.5891E-04 -1.7687E-04 3.1653E-05 S14 1.6546E-02 4.6412E-03 -7.9316E-03 3.3747E-03 -8.3591E-04 1.3821E-04 -1.6044E-05 S15 -6.7865E-02 1.4900E-02 -2.7327E-03 3.5276E-04 -2.8374E-05 1.3906E-06 -4.0447E-08 S16 -3.5348E-02 7.7355E-03 -1.2948E-03 1.4320E-04 -1.0222E-05 4.6100E-07 -1.2505E-08

[0119] Table 4-2

[0120] Example 5

[0121] The following reference Figure 9 Describe the optical imaging device according to Example 5 of the present application.

[0122] 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, which are arranged in sequence from the object side to the image side along the optical axis. The optical imaging device also includes a plurality of spacer elements: a first spacer element P1, which is located between the first lens E1 and the second lens E2 and is in at least partial contact with the image side surface of the first lens E1; a second spacer element P2, which is located between the second lens E2 and the third lens E3 and is in at least partial contact with the image side surface of the second lens E2; a third spacer element P3, which is located between the third lens E3 and the fourth lens E4 and is in at least partial contact with the image side surface of the third lens E3; a fourth spacer element P4, which is located between the fourth lens E4 and the fifth lens E5 and is in at least partial contact with the image side surface of the fourth lens E4. The image side surface of the fifth lens E5 is at least partially in contact with the image side surface; the fifth spacing element P5 is located between the fifth lens E5 and the sixth lens E6 and is at least partially in contact with the image side surface of the fifth lens E5; the sixth spacing element P6 is located between the sixth lens E6 and the seventh lens E7 and is at least partially in contact with the image side surface of the sixth lens E6; the seventh spacing element P7 is located between the seventh lens E7 and the eighth lens E8 and is at least partially in contact with the image side surface of the seventh lens E7; and the eighth spacing element P8 is located on the image side of the eighth lens E8 and is at least partially in contact with the image side surface of the eighth lens E8.

[0123] The basic parameter table of the optical imaging device of this embodiment is the same as Table 3, and the high-order coefficient table of the aspheric mirror is the same as Table 4-1 and Table 4-2.

[0124] This embodiment differs from Example 4 in the dimensional values ​​of some structural parameters related to the spacer element and the lens barrel. The values ​​of the various relevant structural parameters in this embodiment and Example 4 are shown in Table 7 below. The detailed descriptions of these parameters are the same as those in Example 2 above and are not repeated here.

[0125] Example 6

[0126] The following reference Figure 10 Describe the optical lens according to Example 6 of the present application.

[0127] 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, which are arranged in sequence from the object side to the image side along the optical axis. The optical imaging device also includes a plurality of spacer elements: a first spacer element P1, which is located between the first lens E1 and the second lens E2 and is in at least partial contact with the image side surface of the first lens E1; a second spacer element P2, which is located between the second lens E2 and the third lens E3 and is in at least partial contact with the image side surface of the second lens E2; a third spacer element P3, which is located between the third lens E3 and the fourth lens E4 and is in at least partial contact with the image side surface of the third lens E3; a fourth spacer element P4, which is located between the fourth lens E4 and the fifth lens E5 and is in at least partial contact with the image side surface of the fourth lens E4. The image side surface of the fifth lens E5 is at least partially in contact with the image side surface; the fifth spacing element P5 is located between the fifth lens E5 and the sixth lens E6 and is at least partially in contact with the image side surface of the fifth lens E5; the sixth spacing element P6 is located between the sixth lens E6 and the seventh lens E7 and is at least partially in contact with the image side surface of the sixth lens E6; the seventh spacing element P7 is located between the seventh lens E7 and the eighth lens E8 and is at least partially in contact with the image side surface of the seventh lens E7; and the eighth spacing element P8 is located on the image side of the eighth lens E8 and is at least partially in contact with the image side surface of the eighth lens E8.

[0128] The basic parameter table of the optical imaging device of this embodiment is also the same as Table 3, and the high-order coefficient table of the aspheric mirror is also the same as Table 4-1 and Table 4-2.

[0129] This embodiment differs from Example 4 in the dimensional values ​​of some structural parameters related to the spacer element and the lens barrel. The values ​​of the various structural parameters of this embodiment are shown in Table 7 below. The detailed descriptions of these parameters are the same as those in Example 2 above and are not repeated here.

[0130] Figure 11 The axial chromatic aberration curves of the optical imaging devices of Example 4, Example 5 and Example 6 are shown, which represent the deviation of the convergent focus of light of different wavelengths passing through the lens. Figure 12 Astigmatism curves of the optical imaging devices of Example 4, Example 5 and Example 6 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 13 The distortion curves of the optical imaging devices of Example 4, Example 5 and Example 6 are shown, which represent the distortion values ​​corresponding to different image heights. Figures 11 to 13 It can be seen that the optical imaging devices provided in Examples 4, 5 and 6 can achieve good imaging quality.

[0131] Example 7

[0132] The following reference Figure 14 Describe the optical imaging device according to Example 7 of the present application.

[0133] 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, which are arranged in sequence from the object side to the image side along the optical axis.

[0134] 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; a fourth spacer element P4, located between the fourth lens E4 and the fifth lens E5 and in at least partial contact with the image side surface of the fourth lens E5. The image side surface of the fifth lens E5 and the sixth lens E6 are at least partially in contact with the image side surface of the fifth lens E5; the sixth lens E6 is located between the sixth lens E6 and the seventh lens E7 and is at least partially in contact with the image side surface of the sixth lens E6; the seventh lens E7 is located between the seventh lens E7 and the eighth lens E8 and is at least partially in contact with the image side surface of the seventh lens E7; and the eighth lens E8 is located on the image side of the eighth lens E8 and is at least partially in contact with the image side surface of the eighth lens E8.

[0135] In this embodiment, the first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative focal power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive focal power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative focal power, with its object-side surface S15 being convex and its image-side surface S16 being concave.

[0136] Table 5 shows the basic parameters of the optical imaging device of Example 7, wherein the units of the curvature radius, thickness / distance and effective radius are all millimeters (mm).

[0137]

[0138] Table 5

[0139] In this embodiment, the object side surface and the image side surface of any lens among the first lens E1 to the eighth lens E8 are aspherical surfaces. The surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. Tables 6-1 and 6-2 show the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0140]

[0141]

[0142] Table 6-1

[0143] 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 -1.6321E-04 3.7554E-05 -6.2028E-06 7.1936E-07 -5.5370E-08 2.5225E-09 -5.1107E-11 S12 -1.1873E-04 2.0221E-05 -2.3767E-06 1.8931E-07 -9.7590E-09 2.9375E-10 -3.9193E-12 S13 -2.4517E-05 2.4648E-06 -1.7391E-07 8.4189E-09 -2.6604E-10 4.9384E-12 -4.0810E-14 S14 2.9008E-06 -2.2066E-07 1.2100E-08 -4.6582E-10 1.1930E-11 -1.8220E-13 1.2534E-15 S15 -1.0575E-11 4.7605E-14 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S16 -6.5979E-11 5.9290E-13 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0144] Table 6-2

[0145] Example 8

[0146] The following reference Figure 15 Describe the optical imaging device according to Example 8 of the present application.

[0147] 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, which are arranged in sequence from the object side to the image side along the optical axis. The optical imaging device also includes a plurality of spacer elements: a first spacer element P1, which is located between the first lens E1 and the second lens E2 and is in at least partial contact with the image side surface of the first lens E1; a second spacer element P2, which is located between the second lens E2 and the third lens E3 and is in at least partial contact with the image side surface of the second lens E2; a third spacer element P3, which is located between the third lens E3 and the fourth lens E4 and is in at least partial contact with the image side surface of the third lens E3; a fourth spacer element P4, which is located between the fourth lens E4 and the fifth lens E5 and is in at least partial contact with the image side surface of the fourth lens E4. The image side surface of the fifth lens E5 is at least partially in contact with the image side surface; the fifth spacing element P5 is located between the fifth lens E5 and the sixth lens E6 and is at least partially in contact with the image side surface of the fifth lens E5; the sixth spacing element P6 is located between the sixth lens E6 and the seventh lens E7 and is at least partially in contact with the image side surface of the sixth lens E6; the seventh spacing element P7 is located between the seventh lens E7 and the eighth lens E8 and is at least partially in contact with the image side surface of the seventh lens E7; and the eighth spacing element P8 is located on the image side of the eighth lens E8 and is at least partially in contact with the image side surface of the eighth lens E8.

[0148] The basic parameter table of the optical imaging device of this embodiment is the same as Table 5, and the high-order coefficient table of the aspheric mirror is the same as Table 6-1 and Table 6-2.

[0149] This embodiment differs from Example 7 in the dimensional values ​​of some structural parameters related to the spacer element and the lens barrel. The values ​​of the various relevant structural parameters in this embodiment and Example 7 are shown in Table 7 below. The detailed descriptions of these parameters are the same as those in Example 2 above and are not repeated here.

[0150] Example 9

[0151] The following reference Figure 16 Describe the optical lens according to Example 9 of the present application.

[0152] 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, which are arranged in sequence from the object side to the image side along the optical axis. The optical imaging device also includes a plurality of spacer elements: a first spacer element P1, which is located between the first lens E1 and the second lens E2 and is in at least partial contact with the image side surface of the first lens E1; a second spacer element P2, which is located between the second lens E2 and the third lens E3 and is in at least partial contact with the image side surface of the second lens E2; a third spacer element P3, which is located between the third lens E3 and the fourth lens E4 and is in at least partial contact with the image side surface of the third lens E3; a fourth spacer element P4, which is located between the fourth lens E4 and the fifth lens E5 and is in at least partial contact with the image side surface of the fourth lens E4. The image side surface of the fifth lens E5 is at least partially in contact with the image side surface; the fifth spacing element P5 is located between the fifth lens E5 and the sixth lens E6 and is at least partially in contact with the image side surface of the fifth lens E5; the sixth spacing element P6 is located between the sixth lens E6 and the seventh lens E7 and is at least partially in contact with the image side surface of the sixth lens E6; the seventh spacing element P7 is located between the seventh lens E7 and the eighth lens E8 and is at least partially in contact with the image side surface of the seventh lens E7; and the eighth spacing element P8 is located on the image side of the eighth lens E8 and is at least partially in contact with the image side surface of the eighth lens E8.

[0153] The basic parameter table of the optical imaging device of this embodiment is also the same as Table 5, and the high-order coefficient table of the aspheric mirror is also the same as Table 6-1 and Table 6-2.

[0154] This embodiment differs from Example 7 in that the dimensions of some of the relevant structural parameters of the spacer element and the lens barrel are different. The values ​​of the relevant structural parameters of this embodiment are shown in Table 7 below. The detailed descriptions of these parameters are the same as those in Example 2 above and are not repeated here.

[0155] Figure 17 The axial chromatic aberration curves of the optical imaging devices of Examples 7, 8 and 9 are shown, which indicate the deviation of the convergent focus of light of different wavelengths passing through the lens. Figure 18 Astigmatism curves of the optical imaging devices of Example 7, Example 8 and Example 9 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 19 The distortion curves of the optical imaging devices of Example 7, Example 8 and Example 9 are shown, which represent the distortion values ​​corresponding to different image heights. Figures 17 to 19 It can be seen that the optical imaging devices provided in Examples 7, 8 and 9 can achieve good imaging quality.

[0156] Parameters / Example Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 D1m 7.41 7.51 7.58 7.55 6.38 6.24 7.43 6.12 6.12 D2s 7.89 7.87 8.06 8.02 6.59 6.52 7.91 6.33 6.33 D2m 7.89 7.87 8.06 8.02 6.59 6.52 7.91 6.33 6.33 d4s 4.84 4.85 4.84 4.78 4.53 4.53 4.56 4.60 4.61 d4m 4.843 4.851 4.843 4.783 4.528 4.528 4.556 4.599 4.609 d5s 6.00 5.90 6.17 5.32 5.43 5.32 5.47 5.47 5.63 d5m 6.00 5.90 6.17 5.32 5.43 5.32 5.47 5.47 5.63 d6s 7.50 7.55 7.50 6.75 6.75 6.84 6.82 7.15 6.99 d7s 9.58 9.72 9.21 8.76 8.83 8.45 8.30 8.30 8.30 EP01 1.33 1.29 1.38 1.15 1.08 1.12 1.16 1.08 1.08 EP12 0.60 0.70 0.55 0.51 0.54 0.56 0.60 0.60 0.60 EP23 0.97 0.66 0.97 0.75 0.79 0.72 0.77 0.85 0.86 EP34 0.38 0.41 0.38 0.36 0.36 0.36 0.61 0.70 0.71 EP45 0.83 0.76 0.83 0.86 0.86 0.86 0.93 0.85 0.81 EP56 0.66 0.70 0.66 0.56 0.56 0.56 0.63 0.63 0.64 EP67 1.02 1.02 0.62 0.66 0.66 0.38 0.59 0.59 0.59

[0157] Table 7

[0158] In addition, in Examples 1 to 9, the effective focal length f of the optical imaging device, the aperture value fno of the optical imaging device, and the effective focal length values ​​f1 to f8 of the first to eighth lenses are respectively shown in Table 8 below.

[0159] Parameters / Example 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 6.99 6.99 6.99 6.81 6.81 6.81 fno 1.50 1.50 1.50 1.55 1.55 1.55 1.55 1.55 1.55 f1(mm) 19.23 19.23 19.23 11.66 11.66 11.66 13.34 13.34 13.34 f2(mm) 9.75 9.75 9.75 14.45 14.45 14.45 12.46 12.46 12.46 f3(mm) -17.64 -17.64 -17.64 -16.04 -16.04 -16.04 -16.64 -16.64 -16.64 f4(mm) 33.41 33.41 33.41 19.20 19.20 19.20 18.96 18.96 18.96 f5(mm) -15.91 -15.91 -15.91 -10.61 -10.61 -10.61 -8.78 -8.78 -8.78 f6(mm) 7.43 7.43 7.43 11.38 11.38 11.38 9.28 9.28 9.28 f7(mm) -52.75 -52.75 -52.75 32.94 32.94 32.94 24.48 24.48 24.48 f8(mm) -10.07 -10.07 -10.07 -9.93 -9.93 -9.93 -8.09 -8.09 -8.09

[0160] Table 8 Examples 1 to 9 respectively meet the conditions shown in Table 9 below.

[0161] Conditional formula / Example Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 f1 / f 2.936 2.936 2.936 1.669 1.669 1.669 1.960 1.960 1.960 EP01 / (CT1×N1) 1.31 1.26 1.35 0.84 0.79 0.83 1.05 0.97 0.97 (D2s-D1m) / f2 0.049 0.037 0.049 0.033 0.0145 0.019 0.039 0.017 0.017 EP12 / f2×V2 3.45 3.99 3.18 1.98 2.08 2.18 2.70 2.70 2.70 CT2 / CT3 1.84 1.84 1.84 1.66 1.66 1.66 1.84 1.84 1.84 EP23 / CT3-EP12 / CT2 1.53 0.66 1.59 1.48 1.56 1.27 1.34 1.57 1.59 EP34 / (R7+R8) 0.01 0.01 0.01 -0.19 -0.19 -0.19 -0.11 -0.12 -0.13 EP45 / EP56-f4 / f5 3.36 3.19 3.36 3.35 3.35 3.35 3.64 3.50 3.43 (d6s-d5m) / (d5s-d4m) 1.30 1.58 1.01 2.63 1.45 1.91 1.48 1.93 1.34 d5m / R11-d6s / R12 1.79 1.80 1.80 1.02 1.03 1.04 1.26 1.31 1.29 EP67 / (d7s-d6s) 0.49 0.47 0.36 0.33 0.32 0.24 0.40 0.52 0.45 ∑ET / ∑CT 0.97 0.92 0.87 0.79 0.81 0.74 0.86 0.88 0.88

[0162] Table 9

[0163] The present application also provides an imaging device, which is provided 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). 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. The imaging device is equipped with the optical imaging device described above.

[0164] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of protection provided in this application is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of this application. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging device, characterized in that comprising a lens barrel and a lens group and a spacer element group assembled in the lens barrel, The lens group includes 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 arranged in sequence from the object side to the image side along the optical axis; There is an air gap between any two adjacent lenses from the first lens to the eighth lens on the optical axis; 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; and The optical imaging device satisfies: 1.6 <f1 / f<3, 1.50≤fno<1.6 and 0.75 <EP01 / (CT1×N1)<1.4, Among them, f1 is the effective focal length of the first lens, f is the total effective focal length of the optical imaging device, fno is the aperture value of the optical imaging device, EP01 is the distance from the object side end face of the lens barrel to the object side face of the first spacer element on the optical axis, CT1 is the center thickness of the first lens on the optical axis, and N1 is the refractive index of the first lens.

2. The optical imaging device according to claim 1, wherein: The spacer element group further includes: 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; The outer diameter D2s of the object-side surface of the second spacer element, the outer diameter D1m of the image-side surface of the first spacer element, and the effective focal length f2 of the second lens satisfy: 0.01≤(D2s-D1m) / f2≤0.

05.

3. The optical imaging device according to claim 1, wherein: The spacer element group further includes: 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; The distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element on the optical axis, the effective focal length f2 of the second lens, and the Abbe number V2 of the second lens satisfy: 1.95 <EP12 / f2×V2<4。 4. The optical imaging device according to claim 1, wherein: Among the center thicknesses of the first to eighth lenses on the optical axis, the center thickness CT3 of the third lens on the optical axis is the smallest; The center thickness CT2 of the second lens on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy: 1.65 <CT2 / CT3<1.85。 5. The optical imaging device according to claim 1, wherein: The spacer element group further includes: 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; and 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; The distance EP23 on the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element, the center thickness CT3 of the third lens on the optical axis, the distance EP12 on the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element, and the center thickness CT2 of the second lens on the optical axis satisfy: 0.65 <EP23 / CT3-EP12 / CT2<1.6。 6. The optical imaging device according to claim 1, wherein: The spacer element group further includes: 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; and 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; The distance EP34 from the image side surface of the third spacer element to the object side surface of the fourth spacer element on the optical axis, the curvature radius R7 of the object side surface of the fourth lens, and the curvature radius R8 of the image side surface of the fourth lens satisfy: -0.2 <EP34 / (R7+R8)<0.02。 7. The optical imaging device according to claim 1, wherein: The spacer element group further includes: 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; and 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. The distance EP45 on the optical axis from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element, the distance EP56 on the optical axis from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element, the effective focal length f4 of the fourth lens element, and the effective focal length f5 of the fifth lens element satisfy: 3.15 <EP45 / EP56-f4 / f5<3.65。 8. The optical imaging device according to claim 1, wherein: The spacer element group further includes: 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; and 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. The inner diameter d6s of the object-side surface of the sixth spacer element, the inner diameter d5m of the image-side surface of the fifth spacer element, the inner diameter d5s of the object-side surface of the fifth spacer element, and the inner diameter d4m of the image-side surface of the fourth spacer element satisfy: 1<(d6s-d5m) / (d5s-d4m)<2.

65.

9. The optical imaging device according to claim 1, wherein: The spacer element group further includes: 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; and 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; The inner diameter d5m of the image-side surface of the fifth spacer, the curvature radius R11 of the object-side surface of the sixth lens, the inner diameter d6s of the object-side surface of the sixth spacer, and the curvature radius R12 of the image-side surface of the sixth lens satisfy: 1 <d5m / R11-d6s / R12<1.85。 10. The optical imaging device according to claim 1, wherein: The spacer element group further includes: 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; A distance EP67 from the image-side surface of the sixth spacer element to the object-side surface of the seventh spacer element on the optical axis, an inner diameter d7s of the object-side surface of the seventh spacer element, and an inner diameter d6s of the object-side surface of the sixth spacer element satisfy the following conditions: 0.2 <EP67 / (d7s-d6s)<0.55。 11. The optical imaging device according to claim 1, wherein: The spacer element group further includes: a second spacer element located between the second lens and the third lens and in at least partial contact with the image side surface of the second lens; a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image side surface of the third lens; a fourth spacer element located between the fourth lens and the fifth lens and in at least partial contact with the image side surface of the fourth lens; a fifth spacer element located between the fifth lens and the sixth lens and in at least partial contact with the image side surface of the fifth lens; a sixth spacer element located between the sixth lens and the seventh lens and in at least partial 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 in at least partial contact with the image side surface of the seventh lens. The sum ΣET of the air gaps on the optical axis between each adjacent two of the first to seventh spacer elements and the sum ΣCT of the center thickness of each of the first to eighth lenses on the optical axis satisfy: 0.7<∑ET / ∑CT<1.

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