Optical imaging device

Abstract

The present application provides an optical imaging device, which includes a lens barrel and a lens group and a spacer assembly accommodated within the lens barrel; the lens group includes, arranged in sequence along the optical axis from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the spacer assembly includes a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens; the optical imaging device satisfies: 2.4 < f1 / DT11 < 3.15; 0.1 ≤ d1s / |R1 - R2| < 0.55.

Description

Technical Field

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

[0002] With the development of smart phones, consumers' requirements for the quality of self-taken images have been continuously increasing, which has led to the rapid development and iteration of the design of front-facing mobile phone lenses. Currently, there are mainly two development directions for front-facing mobile phone lenses. On the one hand, efforts are made to minimize the head size as much as possible to achieve a larger screen-to-body ratio for the mobile phone. On the other hand, higher optical performance and better imaging quality are pursued.

[0003] To reduce the head size of the lens for a larger screen occupation ratio, it is necessary to minimize the head diameter of the lens as much as possible, which poses higher requirements for the feasibility of the overall optical architecture selection and structural space design. At the same time, during miniaturization, problems caused by structural limitations need to be prevented, such as the problem of internal stray light caused by the protrusion of the front lens. To enable the lens to have higher optical performance and better imaging quality in optical imaging, it is necessary to further increase the number of lens elements in the optical system. Currently, the number of lens elements in existing front-facing mobile phone lenses has gradually increased from the initial three or four to five or even six, and the size of the image plane chip has also become larger, enabling the lens to have higher pixels and better image quality.

[0004] The head size of the lens affects the light transmittance of the lens. If the light transmittance of the lens is small, the imaging will be dark and local vignetting is likely to occur. If the light transmittance is large, problems such as highlight overflow in imaging and abnormal display of bright part details will occur. Therefore, it is necessary to control the effective focal length of the first lens and the effective diameter of the light-transmitting part on the object side of the lens. However, if the refractive power of the first lens is strong, the light will be locally converged and strong stray light will be formed on other lens elements. Summary of the Invention

[0005] One advantage of this application is to provide an optical imaging device that can have high optical performance and imaging quality while meeting the requirements of lens miniaturization.

[0006] This application provides an optical imaging device, including: a lens barrel and a lens group and a spacer component accommodated within the lens barrel; the lens group includes, arranged in sequence along the optical axis from the object side to the image side: a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens, a fifth lens with a positive optical power, and a sixth lens with a negative optical power; the object side surface of the first lens is convex; the image side surface of the second lens is concave; the object side surface and the image side surface of the third lens are both convex; the object side surface of the fourth lens is concave; the image side surface of the fifth lens is convex; the object side surface and the image side surface of the sixth lens are convex and concave respectively;

[0007] The spacer assembly includes a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens; the optical imaging device satisfies:

[0008] 2.4 < f1 / DT11 < 3.15;

[0009] 0.1 ≤ d1s / |R1 - R2| < 0.55;

[0010] wherein, d1s is the object-side inner diameter of the first spacer element, f1 is the effective focal length of the first lens, DT11 is the effective diameter of the light-transmitting portion of the object side surface of the first lens, R1 is the curvature radius of the object side surface of the first lens, and R2 is the curvature radius of the image side surface of the first lens.

[0011] In some embodiments of the present application, the optical imaging device satisfies:

[0012] 0.15 < (D0s - d1s) / R1 < 0.65;

[0013] wherein, D0s is the outer diameter of the object side surface of the lens barrel, d1s is the object-side inner diameter of the first spacer element, and R1 is the curvature radius of the object side surface of the first lens.

[0014] In some embodiments of the present application, the optical imaging device satisfies:

[0015] 1.1 < (EP01 + CP1) / CT1 < 1.45;

[0016] wherein, EP01 is the axial distance from the object side surface of the lens barrel to the object side surface of the first spacer element, CT1 is the central thickness of the first lens, and CP1 is the central thickness of the first spacer element.

[0017] In some embodiments of the present application, in the lens group, the first lens has the strongest positive refractive power, the second lens has negative refractive power, and the optical imaging device satisfies:

[0018] -2.65 < (f1 + f2) / d1m < -0.55;

[0019] Wherein, d1m is the image-side inner diameter of the first spacer element, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0020] In some embodiments of the present application, the optical imaging device satisfies:

[0021] 1.05 ≤ D2s / D1s < 1.45;

[0022] Wherein, D1s is the object-side outer diameter of the first spacer element, and D2s is the object-side outer diameter of the second spacer element.

[0023] In some embodiments of the present application, the optical imaging device satisfies:

[0024] 0.25 < EP23 / (d3s - d2m) < 4.85;

[0025] Wherein, d3s is the object-side inner diameter of the third spacer element, d2m is the image-side inner diameter of the second spacer element, and EP23 is the on-axis distance from the image side surface of the second spacer element to the object side surface of the third spacer element.

[0026] In some embodiments of the present application, the optical imaging device satisfies:

[0027] -19.8 < (R6 + R7) / (D3m - d3s) < -4.7;

[0028] Wherein, R6 is the curvature radius of the image side surface of the third lens, R7 is the curvature radius of the object side surface of the fourth lens, d3s is the object-side inner diameter of the third spacer element, and D3m is the outer diameter of the image side surface of the third spacer element.

[0029] In some embodiments of the present application, the refractive index of the second lens and the refractive index of the third lens are arranged in a high-low combination, and the optical imaging device satisfies:

[0030] 0.95 < EP12 / (CT2 × N2) < 1.25;

[0031] 0.3 < EP23 / (CT3 × N3) < 1.0;

[0032] Wherein, EP12 is the on-axis distance from the image side surface of the first spacer element to the object side surface of the second spacer element, EP23 is the on-axis distance from the image side surface of the second spacer element to the object side surface of the third spacer element, CT2 is the central thickness of the second lens, CT3 is the central thickness of the third lens, N2 is the refractive index of the second lens, and N3 is the refractive index of the third lens.

[0033] In some embodiments of the present application, when the optical imaging device satisfies: 0.3 < EP23 / (CT3×N3) < 0.55, the spacer assembly further includes at least one auxiliary spacer element disposed between the third lens and the fourth lens; wherein, EP23 is the axial distance 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, and N3 is the refractive index of the third lens.

[0034] In some embodiments of the present application, the auxiliary spacer element is a third auxiliary spacer element disposed between the third spacer element and the fourth lens and in contact with the image side of the third spacer element, and the optical imaging device satisfies:

[0035] 1.2 ≤ D3bs / (d3bs + CP3b) ≤ 1.9;

[0036] wherein, d3bs is the inner diameter of the object side of the third auxiliary spacer element, D3bs is the outer diameter of the object side of the third auxiliary spacer element, and CP3b is the central thickness of the third auxiliary spacer element.

[0037] In some embodiments of the present application, both the object side and the image side of the fifth lens have an inflection point, and the optical imaging device satisfies:

[0038] 0.6 ≤ (d4m - YC51) / (d5s - YC52) < 0.8;

[0039] wherein, d4m is the inner diameter of the image side of the fourth spacer element, d5s is the inner diameter of the object side of the fifth spacer element, YC51 is the perpendicular distance from the inflection point on the object side surface of the fifth lens to the optical axis, and YC52 is the perpendicular distance from the inflection point on the image side surface of the fifth lens to the optical axis.

[0040] In some embodiments of the present application, the inner wall of the lens barrel rises step by step from the object side to the image side, and the outer diameter and inner diameter of each spacer element in the spacer assembly are arranged step by step from the object side to the image side. Among them, the outer diameter D1s of the object side of the first spacer element is the smallest, and the outer diameter D5s of the object side of the fifth spacer element is the largest; the inner diameter d1s of the object side of the first spacer element is the smallest, and the inner diameter d5s of the object side of the fifth spacer element is the largest.

[0041] In summary, the optical imaging device of the present application has a relatively small head size. By reasonably restricting the effective focal length of the first lens and the effective diameter of the light-transmitting portion on the object side of the first lens, the light passing through the lens can be effectively guaranteed, thereby avoiding the problem of local vignetting caused by relatively dim imaging when the light passing through the lens is small, or avoiding the problems of imaging highlight overflow and abnormal display of bright part details when the light passing through the lens is large. However, under such conditions, the strong bending force of the first lens will cause local convergence of light on other lenses, forming strong stray light. After reasonably controlling the curvature radius of the first lens and the inner diameter of the object side of the first spacer element in the present application, on the one hand, by controlling the inner diameter of the object side of the first spacer element, the excess light can be intercepted to prevent it from hitting other lens structures. On the other hand, by controlling the curvature radius, the light can be evenly distributed to prevent the light from converging on other lens structures, thereby reducing stray light. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a schematic diagram of the structural parameters of an optical imaging device according to an embodiment of the present application;

[0043] Figure 2 is a schematic diagram of the structure of an optical imaging device according to Embodiment 1 of the present application;

[0044] Figure 3 is a schematic diagram of the structure of an optical imaging device according to Embodiment 2 of the present application;

[0045] Figure 4 is a schematic diagram of the structure of an optical imaging device according to Embodiment 3 of the present application;

[0046] Figure 5A shows a schematic diagram of the axial chromatic aberration curve of the optical imaging devices according to Embodiment 1, Embodiment 2, and Embodiment 3 of the present application;

[0047] Figure 5B shows a schematic diagram of the astigmatism curve of the optical imaging devices according to Embodiment 1, Embodiment 2, and Embodiment 3 of the present application;

[0048] Figure 5C shows a schematic diagram of the distortion curve of the optical imaging devices according to Embodiment 1, Embodiment 2, and Embodiment 3 of the present application;

[0049] Figure 6 is a schematic diagram of the structure of an optical imaging device according to Embodiment 4 of the present application;

[0050] Figure 7 is a schematic diagram of the structure of an optical imaging device according to Embodiment 5 of the present application;

[0051] Figure 8Schematic structural diagram of an optical imaging device according to Embodiment 6 of the present application;

[0052] Figure 9A Schematic diagram of the axial chromatic aberration curve of the optical imaging device according to the above-mentioned Embodiment 4, the above-mentioned Embodiment 5, and the above-mentioned Embodiment 6 of the present application;

[0053] Figure 9B Schematic diagram of the astigmatism curve of the optical imaging device according to the above-mentioned Embodiment 4, the above-mentioned Embodiment 5, and the above-mentioned Embodiment 6 of the present application;

[0054] Figure 9C Schematic diagram of the distortion curve of the optical imaging device according to the above-mentioned Embodiment 1, the above-mentioned Embodiment 2, and the above-mentioned Embodiment 3 of the present application;

[0055] Figure 10 Schematic structural diagram of an optical imaging device according to Embodiment 7 of the present application;

[0056] Figure 11 Schematic structural diagram of an optical imaging device according to Embodiment 8 of the present application;

[0057] Figure 12 Schematic structural diagram of an optical imaging device according to Embodiment 9 of the present application;

[0058] Figure 13A Schematic diagram of the axial chromatic aberration curve of the optical imaging device according to the above-mentioned Embodiment 7, the above-mentioned Embodiment 8, and the above-mentioned Embodiment 9 of the present application;

[0059] Figure 13B Schematic diagram of the astigmatism curve of the optical imaging device according to the above-mentioned Embodiment 7, the above-mentioned Embodiment 8, and the above-mentioned Embodiment 9 of the present application;

[0060] Figure 13C Schematic diagram of the distortion curve of the optical imaging device according to the above-mentioned Embodiment 1, the above-mentioned Embodiment 2, and the above-mentioned Embodiment 3 of the present application;

[0061] Figure 14 Schematic diagram of the imaging spot when the optical imaging lens satisfies the relationships f1 / DT11 = 2.64 and d1s / |R1 - R2| = 0.05;

[0062] Figure 15 Schematic diagram of the imaging spot when the optical imaging lens satisfies the relationships f1 / DT11 = 2.64 and d1s / |R1 - R2| = 0.27;

[0063] Figure 16The schematic diagram of the imaging spot is shown when the optical imaging lens satisfies the relationships f1 / DT11 = 2.64 and d1s / |R1 - R2| = 0.7. Detailed implementation manners

[0064] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not 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.

[0065] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another feature and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0066] In the drawings, for the sake of clarity, the thickness, dimensions, and shape of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0067] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be made according to the general methods in the art. For example, the positive or negative of the R value (R refers to the curvature radius of the paraxial region) is used to judge the convexity and concavity. In this article, the surface of each lens closest to the object to be photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens. For the object side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

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

[0069] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formalized sense unless expressly so defined herein.

[0070] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The following embodiments only express several implementation manners of the present application, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the patent scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0071] According to one aspect of the present application, as Figure 1 shown, an embodiment of the present application provides an optical imaging device, which may include a lens barrel and a lens group and a spacer assembly accommodated within the lens barrel; the lens group includes, arranged in sequence from the object side to the image side along the optical axis: a first lens having a negative optical power, a second lens having a positive optical power, a third lens having a positive optical power, and a fourth lens having a negative optical power; the spacer assembly includes a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens, a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens, and a third spacer element disposed on the image side of the third lens and in contact with the image side surface of the third lens.

[0072] As Figure 1As shown in the figure, an embodiment of the present application provides an optical imaging device, which may include a lens barrel and a lens group and a spacer assembly accommodated within the lens barrel; the lens group includes, arranged in sequence from the object side to the image side along the optical axis: a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens, a fifth lens with a positive optical power, and a sixth lens with a negative optical power; the spacer assembly includes a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens.

[0073] In particular, the optical imaging device satisfies:

[0074] 2.4 < f1 / DT11 < 3.15;

[0075] 0.1 ≤ d1s / |R1 - R2| < 0.55;

[0076] wherein, d1s is the object-side inner diameter of the first spacer element, f1 is the effective focal length of the first lens, DT11 is the effective diameter of the light-transmitting portion of the object side surface of the first lens, R1 is the curvature radius of the object side surface of the first lens, and R2 is the curvature radius of the image side surface of the first lens.

[0077] It should be noted that the optical imaging device of the present application has a smaller head size. By reasonably restricting the effective focal length of the first lens and the effective diameter of the light-transmitting portion of the object side surface of the first lens, it is possible to effectively ensure the light passing amount of the lens, avoid the problem of local vignetting when the light passing amount of the lens is small and the imaging is dark, or avoid the problems of imaging highlight overflow and inability to display bright part details normally when the light passing amount of the lens is large. However, under this condition, the strong bending force of the first lens will cause the light to converge locally on other lenses to form strong stray light. After reasonably controlling the curvature radius of the first lens and the object-side inner diameter of the first spacer element in the present application, on the one hand, by controlling the object-side inner diameter of the first spacer element, it is possible to intercept the excess light and prevent it from hitting other lens structures. On the other hand, by controlling the curvature radius, it is possible to evenly distribute the light and prevent the light from converging on other lens structures to weaken the stray light.

[0078] In addition, the object side surface of the first lens is convex; the image side surface of the second lens is concave; the object side surface and the image side surface of the third lens are both convex; the object side surface of the fourth lens is concave; the image side surface of the fifth lens is convex; the object side surface and the image side surface of the sixth lens are convex and concave respectively.

[0079] Exemplarily, Figure 14 FIG. shows a schematic diagram of an imaging spot when the optical imaging lens satisfies the relationships f1 / DT11 = 2.64 and d1s / |R1 - R2| = 0.05; Figure 15 FIG. shows a schematic diagram of an imaging spot when the optical imaging lens satisfies the relationships f1 / DT11 = 2.64 and d1s / |R1 - R2| = 0.27; Figure 16 FIG. shows a schematic diagram of an imaging spot when the optical imaging lens satisfies the relationships f1 / DT11 = 2.64 and d1s / |R1 - R2| = 0.7. From Figure 14 、 Figure 15 and Figure 16 it can be seen that when the relationship d1s / |R1 - R2| is less than 0.1, the object side inner diameter of the first spacer element is too small, the difference in the curvature radii of the object side surface and the image side surface of the first lens is too large, and there is more stray light in the imaging spot, and the effect of improving stray light is poor; when the relationship d1s / |R1 - R2| is greater than 0.55, the object side inner diameter of the first spacer element is too large, the difference in the curvature radii of the object side surface and the image side surface of the first lens is too small, and there is more stray light in the imaging spot, and the effect of improving stray light is poor; when the relationship d1s / |R1 - R2| is in the range greater than 0.1 and less than 0.55, there is less stray light in the imaging spot, and the effect of improving stray light is significant.

[0080] Preferably, the optical imaging device satisfies: 2.42 ≤ f1 / DT11 ≤ 3.14 and 0.1 ≤ d1s / |R1 - R2| ≤ 0.54.

[0081] According to some embodiments of the present application, the optical imaging device satisfies: 0.15 < (D0s - d1s) / R1 < 0.65; where D0s is the outer diameter of the object side surface of the lens barrel, d1s is the object side inner diameter of the first spacer element, and R1 is the curvature radius of the object side surface of the first lens.

[0082] In this way, by reasonably restricting the difference between the inner diameter of the object side surface of the lens barrel and the object side inner diameter of the first spacer element, and the ratio of this difference to the curvature radius of the object side surface of the first lens, it is possible to further restrict the entry of excess light into the lens structure after the first lens during large-angle imaging, reduce the number of light rays of stray light reflected in the lens structure to weaken stray light, and obtain better imaging quality.

[0083] Preferably, the optical imaging device satisfies: 0.17 ≤ (D0s - d1s) / R1 ≤ 0.63.

[0084] According to some embodiments of the present application, the optical imaging device satisfies: 1.1 < (EP01 + CP1) / CT1 < 1.45; where EP01 is the on-axis distance from the object side of the lens barrel to the object side of the first spacer element, CT1 is the central thickness of the first lens, and CP1 is the central thickness of the first spacer element.

[0085] In this way, by reasonably restricting the sum of the on-axis distance from the object side of the lens barrel to the object side of the first spacer element and the central thickness of the first spacer element, the distribution between the thickness of the front end of the lens barrel and the thickness of the first lens can be better restricted, avoiding problems such as excessive assembly deformation and poor assembly stability when the front end of the lens barrel is too thin, which affects the yield. At the same time, it can ensure that the thickness of the first lens is not too small, preventing problems such as insufficient lens strength, difficult molding, and poor molded surface quality, and ensuring the finished product performance and manufacturability of the lens.

[0086] Preferably, the optical imaging device satisfies: 1.13 ≤ (EP01 + CP1) / CT1 ≤ 1.43.

[0087] According to some embodiments of the present application, in the lens group, the first lens has the strongest positive refractive power, the second lens has negative refractive power, and the optical imaging device satisfies: -2.65 < (f1 + f2) / d1m < -0.55; where d1m is the image-side inner diameter of the first spacer element, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0088] In this way, by reasonably controlling the ratio of the sum of the effective focal lengths of the first lens and the second lens to the image-side inner diameter of the first spacer element, on the one hand, the transition of light between the first lens and the second lens can be effectively controlled, and the light trend converges first and then diverges for beam shaping, making each field of view such as energy illuminance more uniform; on the other hand, the combination of the positive focal lens and the negative focal lens can compensate for aberrations to a certain extent, making the imaging clearer and improving the resolution of the imaging system.

[0089] Preferably, the optical imaging device satisfies: -2.62 ≤ (f1 + f2) / d1m ≤ -0.59.

[0090] According to some embodiments of the present application, the optical imaging device satisfies: 1.05 ≤ D2s / D1s < 1.45; where D1s is the object-side outer diameter of the first spacer element, and D2s is the object-side outer diameter of the second spacer element.

[0091] In this way, by reasonably controlling the ratio of the object-side outer diameters of the first spacer element and the second spacer element, it is beneficial to limit the step height between the mating surfaces of the first lens and the second lens group connected thereto, increase the assembly stability, avoid problems such as deformation and inclination in the assembly of the first lens and the second lens due to excessive step height, and ensure the high yield of the lens products.

[0092] Preferably, the optical imaging device satisfies: 1.05 ≤ D2s / D1s ≤ 1.42.

[0093] According to some embodiments of the present application, the optical imaging device satisfies: 0.25 < EP23 / (d3s - d2m) < 4.85; where d3s is the object-side inner diameter of the third spacer element, d2m is the image-side inner diameter of the second spacer element, and EP23 is the on-axis distance from the image side surface of the second spacer element to the object side surface of the third spacer element.

[0094] In this way, by reasonably limiting the ratio of the difference between the object-side inner diameter of the third spacer element and the image-side inner diameter of the second spacer element to the on-axis distance from the image side surface of the second spacer element to the object side surface of the third spacer element, the emergence of stray light exiting from the first lens hitting the second lens and the third lens mechanism can be well restricted, the stray light can be blocked and obstructed, the intensity of internal reflection stray light can be reduced, and the imaging quality can be ensured.

[0095] Preferably, the optical imaging device satisfies: 0.29 ≤ EP23 / (d3s - d2m) ≤ 4.84.

[0096] According to some embodiments of the present application, the optical imaging device satisfies: -19.8 < (R6 + R7) / (D3m - d3s) < -4.7; where R6 is the curvature radius of the image side surface of the third lens, R7 is the curvature radius of the object side surface of the fourth lens, d3s is the object-side inner diameter of the third spacer element, and D3m is the outer diameter of the image side surface of the third spacer element.

[0097] In this way, by reasonably limiting the ratio of the sum of the curvature radii of the image side surface of the third lens and the object side surface of the fourth lens to the difference between the object-side inner diameter and the image-side outer diameter of the third spacer element, on the one hand, it is beneficial to the transition of light between the third lens and the fourth lens, ensuring that the sum of the curvature radii of the image side surface of the third lens and the object side surface of the fourth lens is negative, and the light exits and converges through the image side surface of the third lens and diverges when entering the fourth lens, thereby making the light in each field of view received by the image plane more uniform and reducing aberration. On the other hand, for the mating step height between the third lens and the fourth lens, the assembly stability and the product yield can be ensured.

[0098] Preferably, the optical imaging device satisfies: -19.79 ≤ (R6 + R7) / (D3m - d3s) ≤ -4.72.

[0099] According to some embodiments of the present application, the refractive index of the second lens and the refractive index of the third lens are combined with high and low values, and the optical imaging device satisfies: 0.95 < EP12 / (CT2×N2) < 1.25; 0.3 < EP23 / (CT3×N3) < 1.0; where EP12 is the axial distance from the image side of the first spacer element to the object side of the second spacer element, EP23 is the axial distance from the image side of the second spacer element to the object side of the third spacer element, CT2 is the central thickness of the second lens, CT3 is the central thickness of the third lens, N2 is the refractive index of the second lens, and N3 is the refractive index of the third lens.

[0100] In this way, by reasonably controlling the ratio of the axial distance from the image side of the first spacer element to the object side of the second spacer element to the product of the central thickness of the second lens and the refractive index of the second lens, and the ratio of the axial distance from the image side of the second spacer element to the object side of the third spacer element to the product of the central thickness of the third lens and the refractive index of the third lens. On the one hand, the thickness uniformity of the second lens and the third lens can be well controlled, and it has good forming feasibility; on the other hand, the combination of high and low refractive index materials can make light of different wavelengths converge at almost the same position, thereby effectively reducing chromatic aberration and making the imaging clearer and the color reproduction more accurate.

[0101] Preferably, the optical imaging device satisfies: 0.96 ≤ EP12 / (CT2×N2) ≤ 1.23 and 0.33 ≤ EP23 / (CT3×N3) ≤ 0.96.

[0102] According to some embodiments of the present application, when the optical imaging device satisfies: 0.3 < EP23 / (CT3×N3) < 0.55, the spacer assembly further includes at least one auxiliary spacer element disposed between the third lens and the fourth lens; where EP23 is the axial distance 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, and N3 is the refractive index of the third lens.

[0103] In this way, when the axial distance from the image side of the second spacer element to the object side of the third spacer element is relatively large, at least one auxiliary spacer element needs to be added between the third lens and the fourth lens to undertake the role of distributing the spacer thickness, ensuring the thickness ratio and forming feasibility of the third lens, and avoiding the situation where the edge of the third lens is thick and the middle is thin, resulting in obvious weld lines during forming and affecting the imaging quality.

[0104] According to some embodiments of the present application, the auxiliary spacer element is a third auxiliary spacer element disposed between the third spacer element and the fourth lens and in contact with the image side surface of the third spacer element, and the optical imaging device satisfies: 1.2 ≤ D3bs / (d3bs + CP3b) ≤ 1.9; where d3bs is the object-side inner diameter of the third auxiliary spacer element, D3bs is the object-side outer diameter of the third auxiliary spacer element, and CP3b is the central thickness of the third auxiliary spacer element.

[0105] In this way, when at least a third auxiliary spacer element is added to the optical imaging device, it is necessary to limit the object-side inner diameter, object-side outer diameter, and central thickness of the third auxiliary spacer element. On the one hand, it ensures the processability of the third auxiliary spacer element, and on the other hand, it ensures that the third spacer element can connect the third lens and the fourth lens well, avoiding excessive step differences that may cause lens deformation and affect the imaging resolution.

[0106] According to some embodiments of the present application, both the object side and the image side of the fifth lens have an inflection point, and the optical imaging device satisfies: 0.6 ≤ (d4m - YC51) / (d5s - YC52) < 0.8; where d4m is the image-side inner diameter of the fourth spacer element, d5s is the object-side inner diameter of the fifth spacer element, YC51 is the perpendicular distance from the inflection point on the object side surface of the fifth lens to the optical axis, and YC52 is the perpendicular distance from the inflection point on the image side surface of the fifth lens to the optical axis.

[0107] In this way, the inflection points on both the object side and the image side of the fifth lens can make the marginal rays and the central rays converge better onto a plane, thereby reducing aberration and improving the imaging clarity. By further reasonably controlling the ratio range of the difference between the image-side inner diameter of the fourth spacer element and the perpendicular distance from the inflection point on the object side surface of the fifth lens to the optical axis to the difference between the object-side inner diameter of the fifth spacer element and the perpendicular distance from the inflection point on the image side surface of the fifth lens to the optical axis. On the one hand, it can make the fifth lens have certain processability while correcting aberration, avoiding defects such as welding marks when the lens is overly bent and formed; on the other hand, it ensures the ghost image state of the fifth lens. If the inflection position of the fifth lens is closer to the center, it may generate stronger ghost images with other lenses, affecting the imaging quality.

[0108] Preferably, the optical imaging device satisfies: 0.6 ≤ (d4m - YC51) / (d5s - YC52) ≤ 0.76.

[0109] According to some embodiments of the present application, the inner wall of the lens barrel rises step by step from the object side to the image side, and the object-side outer diameter and inner diameter of each spacer element in the spacer assembly are arranged in a stepped manner from the object side to the image side. Among them, the object-side outer diameter D1s of the first spacer element is the smallest, and the object-side outer diameter D5s of the fifth spacer element is the largest; the object-side inner diameter d1s of the first spacer element is the smallest, and the object-side inner diameter d5s of the fifth spacer element is the largest.

[0110] In this way, since this optical system ensures that it has a smaller head size, the outer diameter of the first lens at the front end will be as small as possible. At the same time, in order to match a larger image plane, the outer diameter of the lens at the rear end will be relatively large. Therefore, the lens can only be assembled starting from the first lens, so that the inner wall of the lens barrel assembled with it rises step by step from the object side to the image side.

[0111] It should be noted that those skilled in the art should understand that without departing from the technical solution claimed in the present application, the number of spacer elements constituting the optical imaging device can be changed to obtain the various results and advantages described in this specification, and the present application does not make specific limitations thereto. For example, according to needs, the optical imaging lens may also include other numbers of spacer elements different from those described in the above embodiments.

[0112] Some specific but non-limiting embodiments of the above embodiments of the present application will be described in more detail below with reference to the accompanying drawings. For the convenience of description, in the following embodiments, OBJ represents the object plane of the optical imaging device, STO represents the surface of the aperture stop, S1 represents the object side surface of the first lens E1, S2 represents the image side surface of the first lens E1, S3 represents the object side surface of the second lens E2, S4 represents the image side surface of the second lens E2, S5 represents the object side surface of the third lens E3, S6 represents the image side surface of the third lens E3, S7 represents the object side surface of the fourth lens E4, and S8 represents the image side surface of the fourth lens E4. In addition, Aj represents the j-th order aspheric coefficient, where j = 4, 6, 8, 10, 12, 14, 16.

[0113] Embodiment 1

[0114] As Figure 2As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a spacer assembly accommodated within the lens barrel P0; the lens group includes, arranged in sequence from the object side to the image side along the optical axis: a first lens E1 with a positive optical power, a second lens E2 with a negative optical power, a third lens E3 with a positive optical power, a fourth lens E4, a fifth lens E5 with a positive optical power, and a sixth lens E6 with a negative optical power; the spacer assembly includes a first spacer element P1 placed between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1, a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2, a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3, a fourth spacer element P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4, and a fifth spacer element P5 placed between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5.

[0115] In this embodiment, the spacer assembly further includes a third auxiliary spacer element P3b placed between the third spacer element P3 and the fourth lens E4 and in contact with the image side surface of the third spacer element P3, and a third secondary spacer element P3c placed between the third auxiliary spacer element P3b and the fourth lens E4 and in contact with the image side surface of the third auxiliary spacer element P3b.

[0116] In this embodiment, the first lens has a positive optical power, and the object side surface S1 and the image side surface S2 of the first lens E1 are a convex surface and a concave surface respectively; the second lens E2 has a negative optical power, and the object side surface S3 and the image side surface S4 of the second lens E2 are both concave surfaces; the third lens E3 has a positive optical power, and the object side surface S5 and the image side surface S6 of the third lens E3 are both convex surfaces; the fourth lens E4 has a negative optical power, and the object side surface S7 and the image side surface S8 of the fourth lens E4 are a concave surface and a convex surface respectively; the fifth lens E5 has a positive optical power, and the object side surface S9 and the image side surface S10 of the fifth lens E5 are both convex surfaces; the sixth lens E6 has a negative optical power, and the object side surface S11 and the image side surface S12 of the sixth lens E6 are a convex surface and a concave surface respectively.

[0117] In addition, Table 1 shows the basic optical parameters of the optical imaging lens of Embodiment 1, where the units of the radius of curvature, thickness / distance, and effective radius are all millimeters (mm).

[0118] Table 1: Basic Optical Parameter Table of the Optical Imaging Device of Embodiment 1

[0119] It should be noted that the materials in Table 1 include the refractive index and Abbe number. For example, for Material 1.54 and 56.11 of S1 in Table 1, they respectively represent that the refractive index of the first lens E1 is 1.54 and the Abbe number is 56.11.

[0120] In this embodiment, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces, and the surface profiles of the aspherical lenses can be defined by, but not limited to, the following aspherical formula:

[0121] ;

[0122] where is the sagitta, which is the distance from the vertex of the aspherical surface to the aspherical surface along the optical axis at a position with a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic constant; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for the aspherical surfaces S1 to S12 in Embodiment 1.

[0123] Table 2: Aspherical Coefficient Table of the Optical Imaging Device in Embodiment 1

[0124]

[0125] Embodiment 2

[0126] As Figure 3 shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a spacer assembly accommodated within the lens barrel P0; the lens group includes, arranged in sequence from the object side to the image side along the optical axis: a first lens E1 with a positive optical power, a second lens E2 with a negative optical power, a third lens E3 with a positive optical power, a fourth lens E4, a fifth lens E5 with a positive optical power, and a sixth lens E6 with a negative optical power; the spacer assembly includes a first spacer element P1 placed between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1, a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2, a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3, a fourth spacer element P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4, and a fifth spacer element P5 placed between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5.

[0127] In this embodiment, the spacer assembly further includes a third auxiliary spacer element P3b disposed between the third spacer element P3 and the fourth lens E4 and in contact with the image side surface of the third spacer element P3, and a fourth auxiliary spacer element P4b disposed between the fourth spacer element P4 and the fifth lens E5 and in contact with the image side surface of the fourth spacer element P4.

[0128] It should be noted that, compared with the first embodiment above, the optical imaging device of this second embodiment has the same white object structure, that is, the basic optical parameter table of the optical imaging device of this second embodiment is the same as Table 1, and the aspheric coefficient table is the same as Table 2. However, the optical imaging device of this second embodiment has a different black object structure from the optical imaging device of the first embodiment above, that is, the difference between this second embodiment and the first embodiment above lies in that: the dimensional values of some structural parameters of the lens barrel and the spacer assembly in the optical imaging device are different.

[0129] Specifically, the numerical values of the respective relevant structural parameters in this second embodiment and the first embodiment above are shown in Table 8 later. The multiple black object parameters specifically include: the object-side inner diameter d1s of the first spacer element P1; the image-side inner diameter d1m of the first spacer element P1; the object-side outer diameter D1s of the first spacer element; the image-side inner diameter d2m of the second spacer element P2; the object-side outer diameter D2s of the second spacer element P2; the image-side outer diameter D3m of the third spacer element P3; the object-side inner diameter d3s of the third spacer element P3; the image-side inner diameter d4m of the fourth spacer element P4; the object-side inner diameter d5s of the fifth spacer element P5; the axial distance EP01 from the object-side surface of the lens barrel P0 to the object-side surface of the first spacer element P1; the central thickness CP1 of the first spacer element P1; the axial distance EP12 from the image-side surface of the first spacer element P1 to the object-side surface of the second spacer element P2; the axial distance EP23 from the image-side surface of the second spacer element P2 to the object-side surface of the third spacer element P3; the object-side inner diameter d3bs of the third auxiliary spacer element P3b; the object-side outer diameter D3bs of the third auxiliary spacer element P3b; the central thickness CP3b of the third auxiliary spacer element P3b; the inner diameter d0s of the object-side surface of the lens barrel P0; the outer diameter D0s of the object-side surface of the lens barrel P0. It can be understood that the unit of the numerical values shown for each parameter in Table 8 is millimeter (mm), and, the schematic illustration of each parameter in the structural diagram of the optical imaging device is as Figure 1 shown.

[0130] Embodiment Three

[0131] As Figure 4As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a spacer assembly contained in the lens barrel P0; the lens group includes: a first lens E1 with positive focal power, a second lens E2 with negative focal power, a third lens E3 with positive focal power, a fourth lens E4, a fifth lens E5 with positive focal power, and a sixth lens E6 with negative focal power, which are arranged in sequence from the object side to the image side along the optical axis; the spacer assembly includes a first spacer disposed between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1 element P1, a second spacing element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2, a third spacing element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3, a fourth spacing element P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4, and a fifth spacing element P5 placed between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5.

[0132] In this embodiment, the spacer assembly further includes a fourth auxiliary spacer element P4b disposed between the fourth spacer element P4 and the fifth lens E5 and in contact with the image side surface of the fourth spacer element P4.

[0133] It is worth noting that, compared with the above-mentioned embodiment 1, the optical imaging device of the embodiment 3 has the same white object structure, that is, the basic optical parameter table of the optical imaging device of the embodiment 3 is the same as Table 1, and the aspheric coefficient table is the same as Table 2. However, the optical imaging device of the embodiment 3 has a different black object structure from the optical imaging device of the above-mentioned embodiment 1, that is, the difference between the embodiment 3 and the above-mentioned embodiment 1 is that the size values of some structural parameters of the lens barrel and the spacing component in the optical imaging device are different. Specifically, the values of the various related structural parameters in the embodiment 3 are shown in Table 8 below, and the specific description of the multiple black object parameters is the same as the related description in the above-mentioned embodiment 2, which will not be repeated here.

[0134] After simulation test, the axial chromatic aberration curves of the optical imaging device in Embodiment 1, Embodiment 2 and Embodiment 3 are as follows: Figure 5A As shown, it indicates the degree of deviation of the focal point of light of different wavelengths after passing through the optical imaging device; the astigmatism curves of the optical imaging device in Embodiment 1, Embodiment 2 and Embodiment 3 are shown in FIG. Figure 5B As shown, it represents the degree of meridian image curvature and sagittal image curvature; the distortion curves of the optical imaging device in Embodiment 1, Embodiment 2 and Embodiment 3 are as shown Figure 5C As shown in , it shows the distortion at different field of view angles. Figure 5A , Figure 5B andFigure 5C It can be seen that the optical imaging devices in the first embodiment, the second embodiment, and the third embodiment can all achieve good imaging quality.

[0135] Embodiment Four

[0136] As Figure 6 shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a spacer assembly accommodated within the lens barrel P0; the lens group includes, arranged in sequence along the optical axis from the object side to the image side: a first lens E1 with a positive optical power, a second lens E2 with a negative optical power, a third lens E3 with a positive optical power, a fourth lens E4, a fifth lens E5 with a positive optical power, and a sixth lens E6 with a negative optical power; the spacer assembly includes a first spacer element P1 disposed between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1, a second spacer element P2 disposed between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2, a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3, a fourth spacer element P4 disposed between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4, and a fifth spacer element P5 disposed between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5.

[0137] In this embodiment, the spacer assembly further includes a first auxiliary spacer element P1b disposed between the first spacer element P1 and the second lens E2 and in contact with the image side surface of the first spacer element P1, a third auxiliary spacer element P3b disposed between the third spacer element P3 and the fourth lens E4 and in contact with the image side surface of the third spacer element P3, and a third auxiliary spacer element P3c disposed between the third auxiliary spacer element P3b and the fourth lens E4 and in contact with the image side surface of the third auxiliary spacer element P3b.

[0138] In this embodiment, the first lens has a positive optical power, and both the object side surface S1 and the image side surface S2 of the first lens E1 are convex surfaces; the second lens E2 has a negative optical power, and the object side surface S3 and the image side surface S4 of the second lens E2 are a convex surface and a concave surface respectively; the third lens E3 has a positive optical power, and both the object side surface S5 and the image side surface S6 of the third lens E3 are convex surfaces; the fourth lens E4 has a negative optical power, and both the object side surface S7 and the image side surface S8 of the fourth lens E4 are concave surfaces; the fifth lens E5 has a positive optical power, and both the object side surface S9 and the image side surface S10 of the fifth lens E5 are convex surfaces; the sixth lens E6 has a negative optical power, and the object side surface S11 and the image side surface S12 of the sixth lens E6 are a convex surface and a concave surface respectively.

[0139] In addition, Table 3 shows the basic optical parameters of the optical imaging lens of Embodiment 4, where the units of the radius of curvature, thickness / distance, and effective radius are all millimeters (mm).

[0140] Table 3: Basic Optical Parameter Table of the Optical Imaging Device of Embodiment 4

[0141]

[0142] In this embodiment, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface profiles of the aspherical lenses can be defined by the aspherical formula given in Embodiment 1 above. Table 4 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 of the aspherical mirror surfaces S1 to S12 that can be used in Embodiment 4.

[0143] Table 4: Aspherical Coefficient Table of the Optical Imaging Device of Embodiment 4

[0144]

[0145] Embodiment 5

[0146] As Figure 7 shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a spacer assembly accommodated within the lens barrel P0; the lens group includes, arranged in sequence from the object side to the image side along the optical axis: a first lens E1 with positive optical power, a second lens E2 with negative optical power, a third lens E3 with positive optical power, a fourth lens E4, a fifth lens E5 with positive optical power, and a sixth lens E6 with negative optical power; the spacer assembly includes a first spacer element P1 placed between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1, a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2, a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3, a fourth spacer element P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4, and a fifth spacer element P5 placed between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5.

[0147] In this embodiment, the spacer assembly further includes a third auxiliary spacer element P3b placed between the third spacer element P3 and the fourth lens E4 and in contact with the image side of the third spacer element P3.

[0148] It should be noted that, compared with the fourth embodiment above, the optical imaging device of this fifth embodiment has the same white object structure, that is, the basic optical parameter table of the optical imaging device of this fifth embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. However, the optical imaging device of this fifth embodiment and the optical imaging device of the fourth embodiment above have different black object structures, that is, the difference between this fifth embodiment and the fourth embodiment above lies in that: the dimensional values of some structural parameters of the lens barrel and the spacer assembly in the optical imaging device are different. Specifically, the values of each relevant structural parameter in this fifth embodiment are shown in Table 8 below, and the specific descriptions of multiple black object parameters are the same as the relevant descriptions in the second embodiment above, which will not be elaborated here.

[0149] Embodiment Six

[0150] As Figure 8 shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a spacer assembly accommodated within the lens barrel P0; the lens group includes, arranged in sequence along the optical axis from the object side to the image side: a first lens E1 with a positive optical power, a second lens E2 with a negative optical power, a third lens E3 with a positive optical power, a fourth lens E4, a fifth lens E5 with a positive optical power, and a sixth lens E6 with a negative optical power; the spacer assembly includes a first spacer element P1 placed between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1, a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2, a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3, a fourth spacer element P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4, and a fifth spacer element P5 placed between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5.

[0151] It should be noted that, compared with the fourth embodiment above, the optical imaging device of this sixth embodiment has the same white object structure, that is, the basic optical parameter table of the optical imaging device of this sixth embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. However, the optical imaging device of this sixth embodiment and the optical imaging device of the fourth embodiment above have different black object structures, that is, the difference between this sixth embodiment and the fourth embodiment above lies in that: the dimensional values of some structural parameters of the lens barrel and the spacer assembly in the optical imaging device are different. Specifically, the values of each relevant structural parameter in this sixth embodiment are shown in Table 8 below, and the specific descriptions of multiple black object parameters are the same as the relevant descriptions in the second embodiment above, which will not be elaborated here.

[0152] After simulation tests: The axial chromatic aberration curves of the optical imaging devices in Embodiment Four, Embodiment Five, and Embodiment Six are as Figure 9A shown, which represents the deviation degree of the focusing points of light rays with different wavelengths after passing through the optical imaging device; the astigmatism curves of the optical imaging devices in Embodiment Four, Embodiment Five, and Embodiment Six are as Figure 9B shown, which represents the curvature degree of the meridional image plane and the sagittal image plane; the distortion curves of the optical imaging devices in Embodiment Four, Embodiment Five, and Embodiment Six are as Figure 9C shown, which represents the distortion conditions at different field angles. According to Figure 9A , Figure 9B and Figure 9C it can be known that the optical imaging devices in Embodiment Four, Embodiment Five, and Embodiment Six can all achieve good imaging quality.

[0153] Embodiment Seven

[0154] As Figure 10 shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a spacer assembly accommodated within the lens barrel P0; the lens group includes, arranged in sequence from the object side to the image side along the optical axis: a first lens E1 with positive optical power, a second lens E2 with negative optical power, a third lens E3 with positive optical power, a fourth lens E4, a fifth lens E5 with positive optical power, and a sixth lens E6 with negative optical power; the spacer assembly includes a first spacer element P1 placed between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1, a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2, a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3, a fourth spacer element P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4, and a fifth spacer element P5 placed between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5.

[0155] In this embodiment, the first lens has a positive optical power, and both the object side surface S1 and the image side surface S2 of the first lens E1 are convex surfaces; the second lens E2 has a negative optical power, and the object side surface S3 and the image side surface S4 of the second lens E2 are convex and concave surfaces respectively; the third lens E3 has a positive optical power, and both the object side surface S5 and the image side surface S6 of the third lens E3 are convex surfaces; the fourth lens E4 has a positive optical power, and the object side surface S7 and the image side surface S8 of the fourth lens E4 are concave and convex surfaces respectively; the fifth lens E5 has a positive optical power, and both the object side surface S9 and the image side surface S10 of the fifth lens E5 are convex surfaces; the sixth lens E6 has a negative optical power, and the object side surface S11 and the image side surface S12 of the sixth lens E6 are convex and concave surfaces respectively.

[0156] In addition, Table 5 shows the basic optical parameters of the optical imaging lens of Embodiment VII, where the units of the radius of curvature, thickness / distance, and effective radius are all millimeters (mm).

[0157] Table 5: Basic Optical Parameter Table of the Optical Imaging Device of Embodiment VII

[0158]

[0159] In this embodiment, both the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces, and the surface profiles of the aspherical lenses can be defined by the aspherical formula given in Embodiment I above. Table 6 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 for the aspherical surfaces S1 to S12 in Embodiment VII.

[0160] Table 6: Aspherical Coefficient Table of the Optical Imaging Device of Embodiment VII

[0161]

[0162] Embodiment VIII

[0163] As Figure 11As shown, in this embodiment, the optical imaging device includes a lens barrel P0, a lens group, and a spacer assembly accommodated within the lens barrel P0; the lens group includes, arranged in sequence along the optical axis from the object side to the image side: a first lens E1 with a positive optical power, a second lens E2 with a negative optical power, a third lens E3 with a positive optical power, a fourth lens E4, a fifth lens E5 with a positive optical power, and a sixth lens E6 with a negative optical power; the spacer assembly includes a first spacer element P1 placed between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1, a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2, a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3, a fourth spacer element P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4, and a fifth spacer element P5 placed between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5.

[0164] In this embodiment, the spacer assembly further includes a third auxiliary spacer element P3b placed between the third spacer element P3 and the fourth lens E4 and in contact with the image side surface of the third spacer element P3.

[0165] It should be noted that, compared with the above-mentioned Embodiment 7, the optical imaging device of this Embodiment 9 has the same white object structure, that is, the basic optical parameter table of the optical imaging device of this Embodiment 9 is the same as Table 5, and the aspherical coefficient table is the same as Table 6. However, the optical imaging device of this Embodiment 9 and the optical imaging device of the above-mentioned Embodiment 7 have different black object structures, that is, the difference between this Embodiment 9 and the above-mentioned Embodiment 7 lies in: the dimensional values of some structural parameters of the lens barrel and the spacer assembly in the optical imaging device are different. Specifically, the numerical values of each relevant structural parameter in this Embodiment 9 are shown in Table 8 below. The specific descriptions of multiple black object parameters are the same as the relevant descriptions in Embodiment 2 above and will not be elaborated here.

[0166] Embodiment 9

[0167] As Figure 12As shown, in this embodiment, the optical imaging device includes a lens barrel P0, a lens group and a spacer assembly accommodated within the lens barrel P0; the lens group includes, arranged in sequence along the optical axis from the object side to the image side: a first lens E1 with a positive optical power, a second lens E2 with a negative optical power, a third lens E3 with a positive optical power, a fourth lens E4, a fifth lens E5 with a positive optical power, and a sixth lens E6 with a negative optical power; the spacer assembly includes a first spacer element P1 placed between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1, a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2, a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3, a fourth spacer element P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4, and a fifth spacer element P5 placed between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5.

[0168] In this embodiment, the spacer assembly further includes a third auxiliary spacer element P3b placed between the third spacer element P3 and the fourth lens E4 and in contact with the image side surface of the third spacer element P3, and a fifth auxiliary spacer element P5b placed between the fifth spacer element P5 and the sixth lens E4 and in contact with the image side surface of the fifth spacer element P5.

[0169] It should be noted that, compared with the above-mentioned Embodiment Seven, the optical imaging device of this Embodiment Nine has the same white object structure, that is, the basic optical parameter table of the optical imaging device of this Embodiment Nine is the same as Table 5, and the aspheric coefficient table is the same as Table 6. The optical imaging device of this Embodiment Nine and the optical imaging device of the above-mentioned Embodiment Seven have different black object structures, that is, the difference between this Embodiment Nine and the above-mentioned Embodiment Seven lies in: the size values of some structural parameters of the lens barrel and the spacer assembly in the optical imaging device are different. Specifically, the numerical values of each relevant structural parameter in this Embodiment Nine are respectively as shown in Table 8 below. The specific descriptions of multiple black object parameters are the same as the relevant descriptions in Embodiment Two above and will not be elaborated here.

[0170] After simulation tests: The axial chromatic aberration curves of the optical imaging devices in Embodiment Seven, Embodiment Eight, and Embodiment Nine are as Figure 13A shown, which represents the deviation degree of the convergence points of light rays with different wavelengths after passing through the optical imaging device; the astigmatism curves of the optical imaging devices in Embodiment Seven, Embodiment Eight, and Embodiment Nine are as Figure 13B shown, which represents the curvature degree of the meridional image plane and the curvature degree of the sagittal image plane; the distortion curves of the optical imaging devices in Embodiment Seven, Embodiment Eight, and Embodiment Nine are asFigure 13C As shown, it represents the distortion situation at different field angles. According to Figure 13A , Figure 13B and Figure 13C , it can be known that the optical imaging devices in Embodiment Seven, Embodiment Eight, and Embodiment Nine can all achieve good imaging quality.

[0171] In summary, in Embodiments One to Nine, the effective focal lengths f1 to f6 of the first lens E1 to the sixth lens E6 in the optical imaging device, the effective focal length f of the optical imaging device, the aperture coefficient Fno of the optical imaging device, and the perpendicular distance YC51 from the inflection point on the object side of the fifth lens to the optical axis, and the perpendicular distance YC52 from the inflection point on the image side of the fifth lens to the optical axis are respectively as shown in Table 7 below.

[0172] Table 7: System Optical Parameter Table of the Optical Imaging Device

[0173]

[0174] In addition, the black object structure parameters of the optical imaging devices in Embodiments One to Nine are specifically shown in Table 8.

[0175] Table 8: Black Object Structure Parameter Table of the Optical Imaging Device

[0176]

[0177] In summary, the optical imaging devices in Embodiments One to Nine satisfy the relationships shown in Table 9, specifically as shown in Table 9.

[0178] Table 9: Relationship Table Satisfied by the Optical Imaging Device

[0179]

[0180] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0181] The above embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical imaging device, characterized in that, Comprising: A lens barrel and a lens group and a spacer assembly accommodated within the lens barrel; the lens group includes, arranged in sequence from the object side to the image side along the optical axis: a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens, a fifth lens with a positive optical power, and a sixth lens with a negative optical power; the object side surface of the first lens is convex; the image side surface of the second lens is concave; the object side surface and the image side surface of the third lens are both convex; the object side surface of the fourth lens is concave; the image side surface of the fifth lens is convex; the object side surface and the image side surface of the sixth lens are convex and concave respectively; The spacer assembly includes a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens; the optical imaging device satisfies: 2.4 < f1 / DT11 < 3.15; 0.1 ≤ d1s / |R1 - R2| < 0.55; Wherein, d1s is the object side inner diameter of the first spacer element, f1 is the effective focal length of the first lens, DT11 is the effective diameter of the light-transmitting portion of the object side surface of the first lens, R1 is the curvature radius of the object side surface of the first lens, and R2 is the curvature radius of the image side surface of the first lens.

2. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 0.15 < (D0s - d1s) / R1 < 0.65; Wherein, D0s is the outer diameter of the object side surface of the lens barrel, d1s is the object side inner diameter of the first spacer element, and R1 is the curvature radius of the object side surface of the first lens.

3. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 1.1 < (EP01 + CP1) / CT1 < 1.45; Wherein, EP01 is the on-axis distance from the object side surface of the lens barrel to the object side surface of the first spacer element, CT1 is the central thickness of the first lens, and CP1 is the central thickness of the first spacer element.

4. The optical imaging device according to claim 1, wherein In the lens group, the first lens has the strongest positive bending power, the second lens has a negative bending power, and the optical imaging device satisfies: -2.65 < (f1 + f2) / d1m < -0.55; Wherein, d1m is the image side inner diameter of the first spacer element, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

5. The optical imaging device according to claim 1, wherein The optical imaging device satisfies: 1.05 ≤ D2s / D1s < 1.45; Wherein, D1s is the object side outer diameter of the first spacer element, and D2s is the object side outer diameter of the second spacer element.

6. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 0.25 < EP23 / (d3s - d2m) < 4.85; Wherein, d3s is the object-side inner diameter of the third spacer element, d2m is the image-side inner diameter of the second spacer element, and EP23 is the on-axis distance from the image side surface of the second spacer element to the object side surface of the third spacer element.

7. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: -19.8 < (R6 + R7) / (D3m - d3s) < -4.7; Wherein, R6 is the curvature radius of the image side surface of the third lens, R7 is the curvature radius of the object side surface of the fourth lens, d3s is the object-side inner diameter of the third spacer element, and D3m is the image-side outer diameter of the third spacer element.

8. The optical imaging device according to any one of claims 1 to 7, characterized in that The refractive index of the second lens and the refractive index of the third lens are matched with high and low values, and the optical imaging device satisfies: 0.95 < EP12 / (CT2 × N2) < 1.25; 0.3 < EP23 / (CT3 × N3) < 1.0; Wherein, EP12 is the on-axis distance from the image side surface of the first spacer element to the object side surface of the second spacer element, EP23 is the on-axis distance from the image side surface of the second spacer element to the object side surface of the third spacer element, CT2 is the center thickness of the second lens, CT3 is the center thickness of the third lens, N2 is the refractive index of the second lens, and N3 is the refractive index of the third lens.

9. The optical imaging device according to claim 8, characterized in that, When the optical imaging device satisfies: 0.3 < EP23 / (CT3 × N3) < 0.55, the spacer assembly further includes at least one auxiliary spacer element disposed between the third lens and the fourth lens; wherein, EP23 is the on-axis distance from the image side surface of the second spacer element to the object side surface of the third spacer element, CT3 is the center thickness of the third lens, and N3 is the refractive index of the third lens.

10. The optical imaging device according to claim 9, wherein, The auxiliary spacer element is a third auxiliary spacer element disposed between the third spacer element and the fourth lens and in contact with the image side surface of the third spacer element, and the optical imaging device satisfies: 1.2 ≤ D3bs / (d3bs + CP3b) ≤ 1.9; Wherein, d3bs is the object-side inner diameter of the third auxiliary spacer element, D3bs is the object-side outer diameter of the third auxiliary spacer element, and CP3b is the center thickness of the third auxiliary spacer element.

11. The optical imaging device according to any one of claims 1 to 7, characterized in that, Both the object side and the image side of the fifth lens have anastigmatic points, and the optical imaging device satisfies: 0.6 ≤ (d4m - YC51) / (d5s - YC52) < 0.8; Wherein, d4m is the image-side inner diameter of the fourth spacer element, d5s is the object-side inner diameter of the fifth spacer element, YC51 is the perpendicular distance from the anastigmatic point on the object side surface of the fifth lens to the optical axis, and YC52 is the perpendicular distance from the anastigmatic point on the image side surface of the fifth lens to the optical axis.

12. The optical imaging device according to any one of claims 1 to 7, characterized in that The inner wall of the lens barrel rises step by step from the object side to the image side, and the object-side outer diameters and inner diameters of the respective spacer elements in the spacer assembly are arranged step by step from the object side to the image side. Among them, the object-side outer diameter D1s of the first spacer element is the smallest, and the object-side outer diameter D5s of the fifth spacer element is the largest; the object-side inner diameter d1s of the first spacer element is the smallest, and the object-side inner diameter d5s of the fifth spacer element is the largest.

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