Optical imaging device

Abstract

The invention provides an optical imaging device. The optical imaging device comprises a lens barrel, and a lens group and a spacing assembly which are accommodated in the lens barrel, the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from the object side to the image side along the optical axis. The spacing assembly comprises a first spacing element which is arranged between the first lens and the second lens and is in contact with the image side surface of the first lens, and a second spacing element which is arranged between the second lens and the third lens and is in contact with the image side surface of the second lens; the third spacing element is arranged between the third lens and the fourth lens and is in contact with the image side surface of the third lens; the fourth spacing element is arranged between the fourth lens and the fifth lens and is in contact with the image side surface of the fourth lens; the fifth spacing element is arranged between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; the optical imaging device satisfies: 2.4 lt; f1 / DT11lt; 3.15, 3.15; 0.1 < = d1s / R1-R2lt; and 0.55% of the total weight.

Description

Technical Field

[0001] The present application relates to the technical field of optical devices, and in particular to an optical imaging device. Background Art

[0002] With the development of smart phones, consumers' requirements for selfie image quality are constantly increasing, which has led to the rapid development and iteration of front-facing mobile phone lens design. At present, there are two main development directions for front-facing mobile phone lenses. On the one hand, the pursuit of miniaturization of the head size as much as possible to enable the mobile phone to obtain a larger screen-to-body ratio; on the other hand, the pursuit of higher optical performance and better image quality.

[0003] In order to miniaturize the size of the lens head to obtain a larger screen-to-body ratio, the diameter of the lens head needs to be reduced as much as possible, which puts higher requirements on the feasibility of the overall optical architecture selection and structural space design. In addition, while miniaturizing, it is necessary to prevent problems caused by structural limitations, such as the prominent internal reflection stray light problem of the front lens. In order to make the lens have higher optical performance and better image quality in optical imaging, it is necessary to further increase the number of lenses in the optical system. The number of lenses in the 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 is also getting larger, making the lens have higher pixels and better image quality.

[0004] The size of the lens head has an impact on the light transmission of the lens. If the light transmission of the lens is small, the image will be darker and local vignetting will occur easily. If the light transmission is large, the image will have overflow highlights and the bright details will not be displayed normally. To this end, it is necessary to control the effective focal length of the first lens in the lens and the effective diameter of the light-transmitting part on the object side. However, if the refractive power of the first lens is strong, the light will be locally converged and form strong stray light on other lenses. Summary of the invention

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

[0006] The present application provides an optical imaging device, comprising: a lens barrel, and a lens group and a spacer assembly contained in the lens barrel; the lens group comprises: a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens, a fifth lens with positive optical power, and a sixth lens with negative optical power, which are arranged in sequence from the object side to the image side along the optical axis; the object side surface of the first lens is a convex surface; the image side surface of the second lens is a concave surface; the object side surface and the image side surface of the third lens are both convex surfaces; the object side surface of the fourth lens is a concave surface; the image side surface of the fifth lens is a convex surface; the object side surface and the image side surface of the sixth lens are convex and concave surfaces, respectively; The spacing assembly includes a first spacing element disposed between the first lens and the second lens and in contact with the image side surface of the first lens, a second spacing element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, a third spacing element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, a fourth spacing 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 spacing 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; Among them, d1s is the inner diameter of the object side 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 of the first lens, R1 is the curvature radius of the object side of the first lens, and R2 is the curvature radius of the image side of the first lens.

[0007] In some embodiments of the present application, 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 inner diameter of the object side surface of the first spacing element, and R1 is the radius of curvature of the object side surface of the first lens.

[0008] In some embodiments of the present application, the optical imaging device satisfies: 1.1<(EP01+CP1) / CT1<1.45; Among them, EP01 is the axial distance from the object side surface of the lens barrel to the object side surface of the first spacing element, CT1 is the center thickness of the first lens, and CP1 is the center thickness of the first spacing element.

[0009] In some embodiments of the present application, in the lens group, the first lens has the strongest positive refractive power, the second lens has a negative refractive 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.

[0010] In some embodiments of the present application, 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.

[0011] In some embodiments of the present application, 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.

[0012] In some embodiments of the present application, 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.

[0013] In 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; 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.

[0014] 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 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 central thickness of the third lens, and N3 is the refractive index of the third lens.

[0015] 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 surface of the third spacer element, and the optical imaging device satisfies: 1.2≤D3bs / (d3bs+CP3b)≤1.9; Wherein, d3bs is the inner diameter of the third auxiliary spacing element on the object side, D3bs is the outer diameter of the third auxiliary spacing element on the object side, and CP3b is the center thickness of the third auxiliary spacing element.

[0016] 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: 0.6≤(d4m-YC51) / (d5s-YC52)<0.8; Among them, d4m is the inner diameter of the image side of the fourth spacing element, d5s is the inner diameter of the object side of the fifth spacing element, YC51 is the vertical distance from the inflection point on the object side of the fifth lens to the optical axis, and YC52 is the vertical distance from the inflection point on the image side of the fifth lens to the optical axis.

[0017] In some embodiments of the present application, the inner wall of the lens barrel rises in sequence from the object side to the image side in a stepped arrangement, and the object side outer diameter and inner diameter of each spacing element in the spacing assembly are arranged in sequence from the object side to the image side in a stepped arrangement, wherein the object side outer diameter D1s of the first spacing element is the smallest, and the object side outer diameter D5s of the fifth spacing element is the largest; the object side inner diameter d1s of the first spacing element is the smallest, and the object side inner diameter d5s of the fifth spacing element is the largest.

[0018] In summary, the optical imaging device of the present application has a smaller head size. By reasonably limiting the effective focal length of the first lens and the effective diameter of the light-transmitting portion of the object side of the first lens, the light throughput of the lens can be effectively guaranteed to avoid the phenomenon of local vignetting due to dark imaging when the lens light throughput is small, or avoid the problem of image highlight overflow and bright details not being able to be displayed normally when the lens light throughput is large. However, under this condition, the stronger refractive force of the first lens will cause the light to locally converge on other lenses to form strong stray light. After reasonably controlling the radius of curvature of the first lens and the inner diameter of the object side of the first spacing element, the present application can, on the one hand, intercept excess light by controlling the inner diameter of the object side of the first spacing element to prevent it from hitting other lens structures, and on the other hand, by controlling the radius of curvature, it can evenly distribute light to prevent light from converging on other lens structures to reduce stray light. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of structural parameters of an optical imaging device according to one embodiment of the present application; Figure 2 is a schematic structural diagram of an optical imaging device according to Embodiment 1 of the present application; Figure 3is a schematic structural diagram of an optical imaging device according to Embodiment 2 of the present application; Figure 4 is a schematic structural diagram of an optical imaging device according to Embodiment 3 of the present application; Figure 5A A schematic diagram of an on-axis chromatic aberration curve of an optical imaging device according to the first embodiment, the second embodiment, and the third embodiment of the present application is shown; Figure 5B Schematic diagrams of astigmatism curves of the optical imaging devices according to the first, second and third embodiments of the present application are shown; Figure 5C Schematic diagrams of distortion curves of the optical imaging devices according to the first, second and third embodiments of the present application are shown; Figure 6 is a schematic structural diagram of an optical imaging device according to a fourth embodiment of the present application; Figure 7 is a schematic structural diagram of an optical imaging device according to Embodiment 5 of the present application; Figure 8 is a schematic structural diagram of an optical imaging device according to Embodiment 6 of the present application; Fig. 9A A schematic diagram of an on-axis chromatic aberration curve of an optical imaging device according to the fourth embodiment, the fifth embodiment, and the sixth embodiment of the present application is shown; Fig. 9B Schematic diagrams of astigmatism curves of the optical imaging devices according to the fourth embodiment, the fifth embodiment and the sixth embodiment of the present application are shown; Fig. 9C Schematic diagrams of distortion curves of the optical imaging devices according to the first, second and third embodiments of the present application are shown; Fig.10 is a schematic structural diagram of an optical imaging device according to Embodiment 7 of the present application; Fig.11 is a schematic structural diagram of an optical imaging device according to Embodiment 8 of the present application; Fig.12 is a schematic structural diagram of an optical imaging device according to Embodiment 9 of the present application; Fig.13A A schematic diagram of an on-axis chromatic aberration curve of the optical imaging device according to the seventh embodiment, the eighth embodiment and the ninth embodiment of the present application is shown; Fig. 13B Schematic diagrams of astigmatism curves of the optical imaging devices according to the seventh embodiment, the eighth embodiment and the ninth embodiment of the present application are shown; Fig. 13CSchematic diagrams of distortion curves of the optical imaging devices according to the first, second and third embodiments of the present application are shown; Fig.14 A schematic diagram of imaging light spot when the optical imaging lens satisfies the relationship f1 / DT11=2.64 and d1s / |R1-R2|=0.05 is shown; Fig.15 A schematic diagram of imaging light spot when the optical imaging lens satisfies the relationship f1 / DT11=2.64 and d1s / |R1-R2|=0.27 is shown; Fig.16 The figure shows a schematic diagram of an imaging spot when the optical imaging lens satisfies the relationship f1 / DT11=2.64 and d1s / |R1-R2|=0.7. DETAILED DESCRIPTION

[0020] In order to better understand the present application, a more detailed description will be made of various aspects of the present application 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 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.

[0021] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0022] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0023] 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 type 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 radius of curvature of the paraxial area) is used to judge the concave and convex. 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. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0024] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0025] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0026] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can also be made without departing from the concept of the present application, 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 accompanying drawings and in conjunction with the embodiments.

[0027] According to one aspect of the present application, Figure 1As shown, one embodiment of the present application proposes an optical imaging device, which may include a lens barrel and a lens group and a spacer assembly housed in the lens barrel; the lens group includes: a first lens with negative optical focal length, a second lens with positive optical focal length, a third lens with positive optical focal length, and a fourth lens with negative optical focal length, which are arranged in sequence from the object side to the image side along the optical axis; 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.

[0028] like Figure 1 As shown, an embodiment of the present application provides an optical imaging device, which may include a lens barrel and a lens group and a spacing component contained in the lens barrel; the lens group includes: a first lens with positive optical focal length, a second lens with negative optical focal length, a third lens with positive optical focal length, a fourth lens, a fifth lens with positive optical focal length, and a sixth lens with negative optical focal length, which are arranged in sequence along the optical axis from the object side to the image side; the spacing component includes a first spacing element placed between the first lens and the second lens and in contact with the image side surface of the first lens, a second spacing element placed between the second lens and the third lens and in contact with the image side surface of the second lens, a third spacing element placed between the third lens and the fourth lens and in contact with the image side surface of the third lens, a fourth spacing element placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and a fifth spacing element placed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens.

[0029] In particular, the optical imaging device satisfies: 2.4 <f1 / DT11<3.15; 0.1≤d1s / |R1-R2|<0.55; Among them, d1s is the inner diameter of the object side 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 of the first lens, R1 is the curvature radius of the object side of the first lens, and R2 is the curvature radius of the image side of the first lens.

[0030] It is worth noting that the optical imaging device of the present application has a relatively small head size. By reasonably limiting the effective focal length of the first lens and the effective diameter of the light-transmitting portion of the object side of the first lens, the light throughput of the lens can be effectively guaranteed to avoid the phenomenon of local vignetting due to dark imaging when the lens light throughput is small, or avoid the problem of image highlight overflow and the failure of bright details to be displayed normally when the lens light throughput is large. However, under this condition, the stronger refractive force of the first lens will cause the light to converge locally on other lenses to form strong stray light. After reasonably controlling the radius of curvature of the first lens and the inner diameter of the object side of the first spacing element, the present application can, on the one hand, intercept excess light by controlling the inner diameter of the object side of the first spacing element to prevent it from hitting other lens structures, and on the other hand, by controlling the radius of curvature, it can evenly distribute light to prevent light from converging on other lens structures to reduce stray light.

[0031] 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.

[0032] For example, Fig.14 A schematic diagram of imaging light spot when the optical imaging lens satisfies the relationship f1 / DT11=2.64 and d1s / |R1-R2|=0.05 is shown; Fig.15 A schematic diagram of imaging light spot when the optical imaging lens satisfies the relationship f1 / DT11=2.64 and d1s / |R1-R2|=0.27 is shown; Fig.16 The figure shows the imaging spot diagram when the optical imaging lens satisfies the relationship f1 / DT11=2.64 and d1s / |R1-R2|=0.7. Fig.14 , Fig.15 and Fig.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 spacing element is too small, the difference in curvature radius between the object side and the image side of the first lens is too large, there is more stray light in the imaging spot, and the effect of improving the stray light is poor; when the relationship d1s / |R1-R2| is greater than 0.55, the object side inner diameter of the first spacing element is too large, the difference in curvature radius between the object side and the image side of the first lens is too small, there is more stray light in the imaging spot, and the effect of improving the stray light is poor; when the relationship d1s / |R1-R2| is within the range of greater than 0.1 and less than 0.55, there is less stray light in the imaging spot, and the effect of improving the stray light is significant.

[0033] Preferably, the optical imaging device satisfies: 2.42≤f1 / DT11≤3.14 and 0.1≤d1s / |R1-R2|≤0.54.

[0034] According to some embodiments of the present application, the optical imaging device satisfies: 0.15<(D0s-d1s) / R1<0.65; wherein D0s is the outer diameter of the object side of the lens barrel, d1s is the inner diameter of the object side of the first spacing element, and R1 is the radius of curvature of the object side of the first lens.

[0035] In this way, by reasonably limiting the difference between the inner diameter of the object side surface of the lens barrel and the inner diameter of the object side surface of the first spacing element, as well as the ratio of the difference to the radius of curvature of the object side surface of the first lens, it is possible to further limit the amount of excess light that enters the lens structure behind the first lens during large-angle imaging, reduce the amount of stray light reflected in the lens structure to reduce the stray light, and obtain better imaging quality.

[0036] Preferably, the optical imaging device satisfies: 0.17≤(D0s-d1s) / R1≤0.63.

[0037] According to some embodiments of the present application, the optical imaging device satisfies: 1.1<(EP01+CP1) / CT1<1.45; wherein EP01 is the axial distance from the object side of the lens barrel to the object side of the first spacing element, CT1 is the center thickness of the first lens, and CP1 is the center thickness of the first spacing element.

[0038] In this way, by reasonably limiting the sum of the on-axis distance from the object side of the lens barrel to the object side of the first spacing element and the center thickness of the first spacing element, the distribution between the thickness of the front end of the lens barrel and the thickness of the first lens can be better limited, avoiding the problem of excessive assembly deformation and poor assembly stability when the front end of the lens barrel is too thin, which affects the yield rate. At the same time, it can be ensured that the thickness of the first lens is not too small, resulting in insufficient lens strength, difficulty in molding, and poor molding surface quality, thereby ensuring the finished product performance and manufacturability of the lens.

[0039] Preferably, the optical imaging device satisfies: 1.13≤(EP01+CP1) / CT1≤1.43.

[0040] 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 a negative refractive 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 spacing element, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0041] 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.

[0042] Preferably, the optical imaging device satisfies: -2.62 ≤ (f1 + f2) / d1m ≤ -0.59.

[0043] 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.

[0044] 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 size between the assembly bearing surfaces of the first lens and the second lens group connected thereto, increase the assembly stability, avoid problems such as assembly deformation and assembly tilt of the first lens and the second lens due to excessive step size, and ensure the yield rate of the lens.

[0045] Preferably, the optical imaging device satisfies: 1.05 ≤ D2s / D1s ≤ 1.42.

[0046] 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.

[0047] In this way, by reasonably restricting 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 parts of the second lens and the third lens mechanism that pass through the first lens 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.

[0048] Preferably, the optical imaging device satisfies: 0.29 ≤ EP23 / (d3s - d2m) ≤ 4.84.

[0049] 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 radius of curvature of the image side of the third lens, R7 is the radius of curvature of the object side of the fourth lens, d3s is the inner diameter of the object side of the third spacer element, and D3m is the outer diameter of the image side of the third spacer element.

[0050] In this way, by reasonably restricting the ratio between the sum of the radii of curvature of the image side of the third lens and the object side of the fourth lens and the inner diameter of the object side and the outer diameter of the image side 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 radii of curvature of the image side of the third lens and the object side of the fourth lens is negative. The light is emitted and converged through the image side of the third lens and diverged when incident on 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 abutment step difference between the third lens and the fourth lens, the assembly stability and the yield of the finished product can be ensured.

[0051] Preferably, the optical imaging device satisfies: -19.79 ≤ (R6 + R7) / (D3m - d3s) ≤ -4.72.

[0052] According to some embodiments of the present application, 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; 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.

[0053] 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 the molding feasibility is good; 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.

[0054] Preferably, the optical imaging device satisfies: 0.96 ≤ EP12 / (CT2 × N2) ≤ 1.23 and 0.33 ≤ EP23 / (CT3 × N3) ≤ 0.96.

[0055] 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; 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.

[0056] 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 and fourth lenses to assume the role of distributing the spacer thickness, ensuring the thickness ratio and molding feasibility of the third lens, and avoiding the situation where the edge thickness of the third lens is relatively thick and the middle is relatively thin, resulting in obvious weld lines during molding and affecting the imaging quality.

[0057] 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 of the third spacer element, and the optical imaging device satisfies: 1.2 ≤ D3bs / (d3bs + CP3b) ≤ 1.9; wherein, d3bs is the inner diameter on the object side of the third auxiliary spacer element, D3bs is the outer diameter on the object side of the third auxiliary spacer element, and CP3b is the central thickness of the third auxiliary spacer element.

[0058] In this way, after at least adding the third auxiliary spacer element to the optical imaging device, it is necessary to limit the inner diameter on the object side, the outer diameter on the object side, and the 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.

[0059] 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; wherein, d4m is the inner diameter on the image side of the fourth spacer element, d5s is the inner diameter on 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.

[0060] In this way, the inflection points on both the object side and the image side of the fifth lens can better converge the edge light and the center light onto a plane, thereby reducing aberrations and improving the clarity of the image. By further reasonably controlling the ratio range of the difference between the image side inner diameter of the fourth spacing element and the vertical distance from the inflection point on the object side of the fifth lens to the optical axis and the object side inner diameter of the fifth spacing element and the vertical distance from the inflection point on the image side of the fifth lens to the optical axis. On the one hand, the fifth lens can have a certain degree of processability while correcting aberrations, avoiding defects such as weld marks when the lens is excessively bent and formed; on the other hand, the ghost image state of the fifth lens is guaranteed. If the position of the inflection of the fifth lens is closer to the center, it may produce strong ghost images with other lenses, affecting the image quality.

[0061] Preferably, the optical imaging device satisfies: 0.6≤(d4m-YC51) / (d5s-YC52)≤0.76.

[0062] According to some embodiments of the present application, the inner wall of the lens barrel rises in sequence from the object side to the image side in a stepped arrangement, and the object side outer diameters and inner diameters of each spacing element in the spacing assembly are arranged in sequence from the object side to the image side in a stepped arrangement, wherein the object side outer diameter D1s of the first spacing element is the smallest, and the object side outer diameter D5s of the fifth spacing element is the largest; the object side inner diameter d1s of the first spacing element is the smallest, and the object side inner diameter d5s of the fifth spacing element is the largest.

[0063] In this way, in order to ensure that the optical system has a small head size, the outer diameter of the first lens at the front end will be as small as possible, and in order to match the larger image surface, the outer diameter of the lens at the rear end will be relatively large. Therefore, the lenses can only be assembled from the first lens, so that the inner wall of the lens barrel assembled with it rises from the object side to the image side in a stepped arrangement.

[0064] 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 specifically limit this. For example, as required, the optical imaging lens may also include other numbers of spacer elements different from those described in the above embodiments.

[0065] Some specific but non-restrictive embodiments of the above-mentioned embodiments of the present application are described in more detail below with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ represents the object plane of the optical imaging device, STO represents the surface of the aperture, 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, j=4, 6, 8, 10, 12, 14, 16.

[0066] Embodiment 1 like Figure 2 As 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.

[0067] In this embodiment, the spacing assembly also includes a third auxiliary spacing element P3b placed between the third spacing element P3 and the fourth lens E4 and in contact with the image side surface of the third spacing element P3, and a third auxiliary spacing element P3c placed between the third auxiliary spacing element P3b and the fourth lens E4 and in contact with the image side surface of the third auxiliary spacing element P3b.

[0068] In this embodiment, the first lens has positive focal power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex and concave respectively; the second lens E2 has negative focal power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are both concave; the third lens E3 has positive focal power, and the object-side surface S5 and the image-side surface S6 of the third lens E3 are both convex; the fourth lens E4 has negative focal power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are respectively concave and convex; the fifth lens E5 has positive focal power, and the object-side surface S9 and the image-side surface S10 of the fifth lens E5 are both convex; the sixth lens E6 has negative focal power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are respectively convex and concave.

[0069] In addition, Table 1 shows the basic optical parameters of the optical imaging lens of Example 1, wherein the units of the curvature radius, thickness / distance and effective radius are all millimeters (mm).

[0070] Table 1: Basic optical parameters of the optical imaging device of Example 1

[0071] It should be noted that the materials in Table 1 include refractive index and Abbe number. For example, the materials 1.54 and 56.11 of S1 in Table 1 respectively indicate that the refractive index of the first lens E1 is 1.54 and the Abbe number is 56.11.

[0072] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape of each aspherical lens is The following aspheric formulas can be used but are not limited to: ; in, is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspheric mirror surface S1 to S12 in Example 1.

[0073] Table 2: Aspheric coefficients of the optical imaging device of Example 1

[0074] Embodiment 2 like Figure 3As 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.

[0075] In this embodiment, the spacing assembly also includes a third auxiliary spacing element P3b placed between the third spacing element P3 and the fourth lens E4 and in contact with the image side surface of the third spacing element P3, and a fourth auxiliary spacing element P4b placed between the fourth spacing element P4 and the fifth lens E5 and in contact with the image side surface of the fourth spacing element P4.

[0076] It is worth noting that, compared with the above-mentioned embodiment 1, the optical imaging device of the second embodiment has the same white object structure, that is, the basic optical parameter table of the optical imaging device of the 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 the second embodiment has a different black object structure from the optical imaging device of the first embodiment, that is, the difference between the second embodiment and the first embodiment is that the size values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical imaging device are different.

[0077] Specifically, the values ​​of the relevant structural parameters in the second embodiment and the first embodiment are respectively shown in Table 8 below, and the plurality of black object parameters specifically include: the inner diameter d1s of the object side of the first spacing element P1; the inner diameter d1m of the image side of the first spacing element P1; the outer diameter D1s of the object side of the first spacing element; the inner diameter d2m of the image side of the second spacing element P2; the outer diameter D2s of the object side of the second spacing element P2; the outer diameter D3m of the image side of the third spacing element P3; the inner diameter d3s of the object side of the third spacing element P3; the inner diameter d4m of the image side of the fourth spacing element P4; the inner diameter d5s of the object side of the fifth spacing element P5; the inner diameter d6s of the object side of the lens barrel P0; the inner diameter d7m of the image side of the fourth spacing element P4; the inner diameter d8s of the object side of the fifth spacing element P5; the inner diameter d9s of the object side of the lens barrel P0; the inner diameter d10s of the image side of the lens barrel P1; the inner diameter d11s of the image side of the first spacing element P1; the inner diameter d12s of the image side of the second spacing element P2; the outer diameter d13m of the image side of the third spacing element P3; the inner diameter d14s of the image side of the fourth spacing element P4; the inner diameter d15s of the object side of the fifth spacing element P5; the inner diameter d16s of the image side of the lens barrel P0; the inner diameter d17m of the image side of the first spacing element P1; the inner diameter d18s of the image side of the first spacing element P1 The axial distance EP01 from the image side surface of the first spacing element P1 to the object side surface of the second spacing element P2; the axial distance EP12 from the image side surface of the second spacing element P2 to the object side surface of the third spacing element P3; the object side inner diameter d3bs of the third auxiliary spacing element P3b; the object side outer diameter D3bs of the third auxiliary spacing element P3b; the center thickness CP3b of the third auxiliary spacing 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 units of the numerical values ​​of the parameters shown in Table 8 are all millimeters (mm), and the schematic diagram of the parameters in the structural diagram of the optical imaging device is as follows: Figure 1 shown.

[0078] Embodiment 3 like Figure 4 As 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.

[0079] 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.

[0080] 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.

[0081] 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 and Figure 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.

[0082] Embodiment 4 like Figure 6As 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.

[0083] In this embodiment, the spacing assembly further includes a first auxiliary spacing element P1b placed between the first spacing element P1 and the second lens E2 and in contact with the image side surface of the first spacing element P1, a third auxiliary spacing element P3b placed between the third spacing element P3 and the fourth lens E4 and in contact with the image side surface of the third spacing element P3, and a third auxiliary spacing element P3c placed between the third auxiliary spacing element P3b and the fourth lens E4 and in contact with the image side surface of the third auxiliary spacing element P3b.

[0084] In this embodiment, the first lens has positive focal power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are both convex surfaces; the second lens E2 has negative focal 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 positive focal 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 negative focal power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are both concave surfaces; the fifth lens E5 has positive focal 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 negative focal power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are respectively convex and concave surfaces.

[0085] In addition, Table 3 shows the basic optical parameters of the optical imaging lens of Example 4, wherein the units of the curvature radius, thickness / distance and effective radius are all millimeters (mm).

[0086] Table 3: Basic optical parameters of the optical imaging device of Example 4

[0087] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by the aspherical surface formula given in the above embodiment 1. Table 4 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror surface S1 to S12 in embodiment 4.

[0088] Table 4: Aspheric coefficients of the optical imaging device of Example 4

[0089] Embodiment 5 like Figure 7 As 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.

[0090] 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.

[0091] It is worth noting that, compared with the above-mentioned fourth embodiment, the optical imaging device of the fifth embodiment has the same white object structure, that is, the basic optical parameter table of the optical imaging device of the 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 the fifth embodiment has a different black object structure from the optical imaging device of the fourth embodiment, that is, the difference between the fifth embodiment and the fourth embodiment 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 fifth embodiment 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 second embodiment above, which will not be repeated here.

[0092] Embodiment 6 like Figure 8 As 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.

[0093] It is worth noting that, compared with the above-mentioned fourth embodiment, the optical imaging device of the sixth embodiment has the same white object structure, that is, the basic optical parameter table of the optical imaging device of the 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 the sixth embodiment has a different black object structure from the optical imaging device of the fourth embodiment, that is, the difference between the sixth embodiment and the fourth embodiment 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 sixth embodiment 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 second embodiment above, which will not be repeated here.

[0094] After simulation tests, the axial chromatic aberration curves of the optical imaging devices in Embodiment 4, Embodiment 5 and Embodiment 6 are as follows: Fig. 9AAs 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 the fourth embodiment, the fifth embodiment and the sixth embodiment are shown in Fig. 9B As shown, it represents the degree of meridian image curvature and sagittal image curvature; the distortion curves of the optical imaging device in the fourth embodiment, the fifth embodiment and the sixth embodiment are as shown Fig. 9C As shown in , it shows the distortion at different field of view angles. Fig. 9A , Fig. 9B and Fig. 9C It can be seen that the optical imaging devices in the fourth embodiment, the fifth embodiment and the sixth embodiment can all achieve good imaging quality.

[0095] Embodiment 7 like Fig.10 As 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.

[0096] In this embodiment, the first lens has positive focal power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are both convex surfaces; the second lens E2 has negative focal 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 positive focal 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 positive focal 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 positive focal 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 negative focal power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are convex and concave surfaces respectively.

[0097] In addition, Table 5 shows basic optical parameters of the optical imaging lens of Example 7, wherein the units of the curvature radius, thickness / distance and effective radius are all millimeters (mm).

[0098] Table 5: Basic optical parameters of the optical imaging device of Example 7

[0099] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by the aspherical surface formula given in the above embodiment 1. Table 6 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of each aspherical mirror surface S1 to S12 that can be used in embodiment 7.

[0100] Table 6: Aspheric coefficients of the optical imaging device of Example 7

[0101] Embodiment 8 like Fig.11 As 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.

[0102] 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.

[0103] It is worth noting that, compared with the seventh embodiment, the optical imaging device of the ninth embodiment has the same white object structure, that is, the basic optical parameter table of the optical imaging device of the ninth embodiment is the same as Table 5, and the aspheric coefficient table is the same as Table 6. However, the optical imaging device of the ninth embodiment has a different black object structure from the optical imaging device of the seventh embodiment, that is, the difference between the ninth embodiment and the seventh embodiment is that the size values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical imaging device are different. Specifically, the values ​​of the various related structural parameters in the ninth embodiment 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 second embodiment above, which will not be repeated here.

[0104] Embodiment 9 like Fig.12 As 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.

[0105] In this embodiment, the spacing assembly also includes a third auxiliary spacing element P3b placed between the third spacing element P3 and the fourth lens E4 and in contact with the image side surface of the third spacing element P3, and a fifth auxiliary spacing element P5b placed between the fifth spacing element P5 and the sixth lens E4 and in contact with the image side surface of the fifth spacing element P5.

[0106] It is worth noting that, compared with the seventh embodiment, the optical imaging device of the ninth embodiment has the same white object structure, that is, the basic optical parameter table of the optical imaging device of the ninth embodiment is the same as Table 5, and the aspheric coefficient table is the same as Table 6. However, the optical imaging device of the ninth embodiment has a different black object structure from the optical imaging device of the seventh embodiment, that is, the difference between the ninth embodiment and the seventh embodiment is that the size values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical imaging device are different. Specifically, the values ​​of the various related structural parameters in the ninth embodiment 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 second embodiment above, which will not be repeated here.

[0107] After simulation tests, the axial chromatic aberration curves of the optical imaging devices in Embodiment 7, Embodiment 8 and Embodiment 9 are as follows: Fig.13A 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 the seventh embodiment, the eighth embodiment and the ninth embodiment are as shown in Fig. 13B As shown, it represents the degree of meridian image plane curvature and sagittal image plane curvature; the distortion curves of the optical imaging device in the seventh embodiment, the eighth embodiment and the ninth embodiment are as shown Fig. 13C As shown in , it shows the distortion at different field of view angles. Fig.13A , Fig. 13B and Fig. 13C It can be seen that the optical imaging devices in the seventh embodiment, the eighth embodiment and the ninth embodiment can all achieve good imaging quality.

[0108] In summary, in Examples 1 to 9, 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 vertical distance YC51 from the inflection point on the object side surface of the fifth lens to the optical axis, and the vertical distance YC52 from the inflection point on the image side surface of the fifth lens to the optical axis are respectively as shown in Table 7 below.

[0109] Table 7: System optical parameters of optical imaging device

[0110] In addition, the black object structure parameters of the optical imaging device in Examples 1 to 9 are specifically shown in Table 8.

[0111] Table 8: Black object structure parameter table of optical imaging device

[0112] In summary, the optical imaging devices in Embodiments 1 to 9 satisfy the relationship shown in Table 9, as specifically shown in Table 9.

[0113] Table 9: Relationships satisfied by the optical imaging device The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0114] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An optical imaging device, characterized in that: include: A lens barrel and a lens group and a spacer assembly contained in the lens barrel; the lens group comprises: a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens, a fifth lens with positive focal power, and a sixth lens with negative focal power, which are arranged in sequence from the object side to the image side along the optical axis; the object side surface of the first lens is a convex surface; the image side surface of the second lens is a concave surface; the object side surface and the image side surface of the third lens are both convex surfaces; the object side surface of the fourth lens is a concave surface; the image side surface of the fifth lens is a convex surface; the object side surface and the image side surface of the sixth lens are convex and concave surfaces, respectively; The spacing assembly includes a first spacing element disposed between the first lens and the second lens and in contact with the image side surface of the first lens, a second spacing element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, a third spacing element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, a fourth spacing 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 spacing 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; Among them, d1s is the inner diameter of the object side 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 of the first lens, R1 is the curvature radius of the object side of the first lens, and R2 is the curvature radius of the image side 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 inner diameter of the object side surface of the first spacing element, and R1 is the radius of curvature 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; Among them, EP01 is the axial distance from the object side surface of the lens barrel to the object side surface of the first spacing element, CT1 is the center thickness of the first lens, and CP1 is the center thickness of the first spacing element.

4. The optical imaging device according to claim 1, characterized in that: In the lens group, the first lens has the strongest positive refractive power, the second lens has a negative refractive 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, characterized in that: The optical imaging device satisfies: 1.05≤D2s / D1s<1.45; Wherein, D1s is the outer diameter of the first spacing element on the object side, and D2s is the outer diameter of the second spacing element on the object side.

6. The optical imaging device according to claim 1, characterized in that: The optical imaging device satisfies: 0.25 <EP23 / (d3s-d2m)<4.85; Among them, 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; Among them, 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.

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 arranged in a high-low combination, and the optical imaging device satisfies: 0.95 < EP12 / (CT2 × N2) < 1.25; 0.3 < EP23 / (CT3 × N3) < 1.0; Among them, 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; among them, 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, characterized in that: 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; Among them, 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; Among them, 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 in sequence from the object side to the image side in a stepped arrangement, and the object side outer diameters and inner diameters of the respective spacer elements in the spacer assembly are arranged in sequence from the object side to the image side in a stepped arrangement, wherein 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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