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 plurality of spacing elements which are accommodated in the lens barrel, the lens group comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with negative focal power which are sequentially arranged from the object side to the image side along the optical axis; the plurality of spacing elements comprise a first spacing element, a second spacing element, a third spacing element, a fourth spacing element, a fifth spacing element and a sixth spacing element; the optical imaging device satisfies the following conditions: 4.65 < TD / f * tan (Semi-Fov) < 5.1, and-0.95 < (d0s-EPD) / f1 <-0.70.

Description

TECHNICAL FIELD

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

[0002] Under the background of the rapid development of current optical imaging technology, the optical imaging device plays a crucial role in the industrial field. The optical imaging device has many advantages such as high precision, high speed and high efficiency, and is widely used in industrial production because it can provide clearer, more complete and efficient visual capture and recognition capabilities. In order to record key parameters and data in the production process at any time, the imaging quality of the optical imaging device becomes particularly important.

[0003] However, the traditional seven-piece optical imaging device is prone to cause the light to reflect in the optical imaging device to form redundant stray light under the requirement of ultra-wide angle imaging, especially when the total length of the optical system is relatively long, which forms redundant noise points on the imaging surface, interferes with the image signal, and causes the imaging effect of the optical imaging device to deteriorate. SUMMARY

[0004] One advantage of the present application is to provide an optical imaging device which can solve the problem of deterioration of imaging effect caused by the reflection of light in the optical imaging device to form redundant stray light due to the large total length of the system in the traditional seven-piece ultra-wide angle optical imaging device.

[0005] In one aspect, the present application provides an optical imaging device, comprising a lens barrel, a lens group and a plurality of spacer elements contained in the lens barrel; the lens group comprises, arranged in order along the optical axis from the object side to the image side: a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with negative focal power; the plurality of spacer elements comprises a first spacer element placed between the first lens and the second lens and in contact with the image side of the first lens, a second spacer element placed between the second lens and the third lens and in contact with the image side of the second lens, a third spacer element placed between the third lens and the fourth lens and in contact with the image side of the third lens, a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens, and a sixth spacer element placed between the sixth lens and the seventh lens and in contact with the image side of the sixth lens; the optical imaging device satisfies:

[0006] 4.65 < TD / f x tan (Semi-Fov) < 5.10; and

[0007] -0.95 < (d0s-EPD) / f1 < -0.70;

[0008] wherein TD is an on-axis distance from an object side surface of the first lens to an image side surface of the seventh lens, f is an effective focal length of the optical imaging device, Semi-Fov is a half of a maximum field of view angle of the optical imaging device, f1 is an effective focal length of the first lens, EPD is an entrance pupil diameter of the optical imaging device, and d0s is an inner diameter of the object side surface of the lens barrel.

[0009] In some embodiments of the application, the optical imaging device satisfies:

[0010] 0.3 < (EP01-CT1) / R2 < 0.65;

[0011] wherein EP01 is an on-axis distance from an object side surface of the lens barrel to an object side surface of the first spacer element, R2 is a radius of curvature of the image side surface of the first lens, and CT1 is a center thickness of the first lens.

[0012] In some embodiments of the application, the optical imaging device satisfies:

[0013] 1.85 < (R1-R2) / d1s < 3.85;

[0014] wherein R1 is a radius of curvature of the object side surface of the first lens, R2 is a radius of curvature of the image side surface of the first lens, and d1s is an inner diameter of the object side surface of the first spacer element.

[0015] In some embodiments of the application, the optical imaging device satisfies:

[0016] 0.30 < R2 / D1s < 0.60; and -3.70 < R3 / d1m < -0.90;

[0017] wherein D1s is an outer diameter of the object side surface of the first spacer element, d1m is an inner diameter of the image side surface of the first spacer element, R2 is a radius of curvature of the image side surface of the first lens, and R3 is a radius of curvature of the object side surface of the second lens.

[0018] In some embodiments of the application, the optical imaging device satisfies:

[0019] 0.15 < d2s / (f2-f3) < 0.50;

[0020] wherein d2s is an inner diameter of the object side surface of the second spacer element, f2 is an effective focal length of the second lens, and f3 is an effective focal length of the third lens.

[0021] In some embodiments of the present application, the optical imaging device satisfies:

[0022] 1.45 < (D3s-d3m) / CT3 < 6.85;

[0023] wherein d3m is an image-side inner diameter of the third spacer element, D3s is an object-side outer diameter of the third spacer element, and CT3 is a center thickness of the third lens.

[0024] In some embodiments of the present application, the optical imaging device satisfies:

[0025] 0.90 < (D4s-d4s) / (D3s-d3s) < 1.35;

[0026] wherein d4s is an object-side inner diameter of the fourth spacer element, D4s is an object-side outer diameter of the fourth spacer element, D3s is an object-side outer diameter of the third spacer element, and d3s is an object-side inner diameter of the third spacer element.

[0027] In some embodiments of the present application, the optical imaging device satisfies:

[0028] 0.45 ≤ (d5s-d4m) / (DT51-DT42) < 7.25;

[0029] wherein d4m is an image-side inner diameter of the fourth spacer element, d5s is an object-side inner diameter of the fifth spacer element, DT51 is an effective diameter of an object-side light-transmitting portion of the fifth lens, and DT42 is an effective diameter of an image-side light-transmitting portion of the fourth lens.

[0030] In some embodiments of the present application, the optical imaging device satisfies:

[0031] 1.95 < (D6s-d6s) / T67 < 3.45;

[0032] wherein d6s is an object-side inner diameter of the sixth spacer element, D6s is an object-side outer diameter of the sixth spacer element, and T67 is an on-axis distance from an image-side of the sixth lens to an object-side of the seventh lens.

[0033] In some embodiments of the present application, the optical imaging device satisfies:

[0034] 0 < d6m / (f6-f7) < 0.35;

[0035] wherein d6m is an image-side inner diameter of the sixth spacer element, f6 is an effective focal length of the sixth lens, and f7 is an effective focal length of the seventh lens.

[0036] In some embodiments of the present application, the optical imaging device satisfies:

[0037] 1.05≤L / TD≤1.1;

[0038] wherein L is the maximum height of the lens barrel, and TD is the on-axis distance from the object side surface of the first lens to the image side surface of the seventh lens.

[0039] In summary, in the optical imaging device in the above embodiments of the present application, the refractive powers of the seven lenses are distributed as negative-positive-positive-positive-positive-negative-negative. Based on the imaging requirement of ultra-wide angle, the optical imaging device satisfies the relationship 4.65 < TD / f x tan (Semi-Fov) < 5.10. At this time, since the on-axis distance TD from the object side surface of the first lens to the image side surface of the seventh lens is much larger than the effective focal length f of the optical imaging device, the total length of the optical system is large, the lens barrel surface is easy to reflect the excess stray light to form excess noise points in the imaging surface, resulting in the details in the imaging image being blurred, and the imaging effect of the optical imaging device being poor. Therefore, the present application controls the ratio of the difference between the inner diameter of the object side surface of the lens barrel and the entrance pupil diameter of the optical imaging device and the focal length of the first lens to satisfy the relationship -0.95 < (d0s-EPD) / f1 < -0.70, reasonably controls the light incidence at the object side end of the imaging system, avoids the excess light from entering the optical imaging device, reduces the reflection of the light by the lens barrel, suppresses the generation of stray light, and improves the imaging effect. When the ratio of the difference between the inner diameter of the object side surface of the lens barrel and the entrance pupil diameter of the optical imaging device and the focal length of the first lens is less than the range specified in the above relationship, the difference between the diameter of the object side surface of the lens barrel surface and the entrance pupil diameter of the optical imaging device is large, the inner diameter of the object side of the lens barrel is too large, a large amount of stray light enters the lens barrel, resulting in the generation of bright arc stray light in the upper part of the imaging surface, and affecting the imaging quality of the optical imaging device. When the ratio of the difference between the inner diameter of the object side surface of the lens barrel and the entrance pupil diameter of the optical imaging device and the focal length of the first lens is greater than the range specified in the above relationship, the difference between the diameter of the object side surface of the lens barrel surface and the entrance pupil diameter is small, the inner diameter of the object side of the lens barrel is too small, the edge of the large-angle incident light is reflected at the object side end of the lens barrel, thereby generating a large amount of stray light, resulting in the generation of bright arc stray light in the lower part of the imaging surface, and affecting the imaging quality of the optical imaging device. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1A is a structural parameter diagram of an optical imaging device according to an embodiment of the present application;

[0041] Figure 1B is another structural parameter diagram of an optical imaging device according to an embodiment of the present application;

[0042] Figure 2is a structural schematic diagram of an optical imaging device according to an embodiment one of the present application;

[0043] Figure 3 is a structural schematic diagram of an optical imaging device according to an embodiment two of the present application;

[0044] Figure 4 is a structural schematic diagram of an optical imaging device according to an embodiment three of the present application;

[0045] Figure 5A shows an on-axis chromatic aberration curve schematic diagram of the optical imaging device according to the above embodiment one, the above embodiment two and the above embodiment three of the present application;

[0046] Figure 5B shows an astigmatic curve schematic diagram of the optical imaging device according to the above embodiment one, the above embodiment two and the above embodiment three of the present application;

[0047] Figure 5C shows a distortion curve schematic diagram of the optical imaging device according to the above embodiment one, the above embodiment two and the above embodiment three of the present application;

[0048] Figure 6 is a structural schematic diagram of an optical imaging device according to an embodiment four of the present application;

[0049] Figure 7 is a structural schematic diagram of an optical imaging device according to an embodiment five of the present application;

[0050] Figure 8 is a structural schematic diagram of an optical imaging device according to an embodiment six of the present application;

[0051] Figure 9A shows an on-axis chromatic aberration curve schematic diagram of the optical imaging device according to the above embodiment four, the above embodiment five and the above embodiment six of the present application;

[0052] Figure 9B shows an astigmatic curve schematic diagram of the optical imaging device according to the above embodiment four, the above embodiment five and the above embodiment six of the present application;

[0053] Figure 9C shows a distortion curve schematic diagram of the optical imaging device according to the above embodiment four, the above embodiment five and the above embodiment six of the present application;

[0054] Figure 10 is a structural schematic diagram of an optical imaging device according to an embodiment seven of the present application;

[0055] Figure 11 is a structural schematic diagram of an optical imaging device according to an embodiment eight of the present application;

[0056] Figure 12 is a structural schematic diagram of an optical imaging device according to Embodiment Nine of the present application;

[0057] Figure 13A shows an on-axis chromatic aberration curve schematic diagram of the optical imaging device according to the above-mentioned Embodiment Seven, the above-mentioned Embodiment Eight and the above-mentioned Embodiment Nine of the present application;

[0058] Figure 13B shows an astigmatic curve schematic diagram of the optical imaging device according to the above-mentioned Embodiment Seven, the above-mentioned Embodiment Eight and the above-mentioned Embodiment Nine of the present application;

[0059] Figure 13C shows a distortion curve schematic diagram of the optical imaging device according to the above-mentioned Embodiment Seven, the above-mentioned Embodiment Eight and the above-mentioned Embodiment Nine of the present application;

[0060] Figure 14A shows a spot diagram of the optical imaging device when TD / f x tan (Semi-Fov) = 4.71, (d0s-EPD) / f1 = -0.85 is satisfied;

[0061] Figure 14B shows an optical path diagram of the optical imaging device when TD / f x tan (Semi-Fov) = 4.71, (d0s-EPD) / f1 = -0.85 is satisfied;

[0062] Figure 15A shows a spot diagram of the optical imaging device when TD / f x tan (Semi-Fov) = 4.71, (d0s-EPD) / f1 = -1.10 is satisfied;

[0063] Figure 15B shows an optical path diagram of the optical imaging device when TD / f x tan (Semi-Fov) = 4.71, (d0s-EPD) / f1 = -1.10 is satisfied;

[0064] Figure 16A shows a spot diagram of the optical imaging device when TD / f x tan (Semi-Fov) = 4.71, (d0s-EPD) / f1 = -0.59 is satisfied;

[0065] Figure 16B shows an optical path diagram of the optical imaging device when TD / f x tan (Semi-Fov) = 4.71, (d0s-EPD) / f1 = -0.59 is satisfied.

[0066] Reference numerals: P0, lens barrel; E1, first lens; E2, second lens; E3, third lens; E4, fourth lens; E5, fifth lens; E6, sixth lens; E7, seventh lens; S1, object side surface of the first lens; S2, image side surface of the first lens; S3, object side surface of the second lens; S4, image side surface of the second lens; S5, object side surface of the third lens; S6, image side surface of the third lens; S7, object side surface of the fourth lens; S8, image side surface of the fourth lens; S9, object side surface of the fifth lens; S10, image side surface of the fifth lens; S11, object side surface of the sixth lens; S12, image side surface of the sixth lens; S13, object side surface of the seventh lens; S14, image side surface of the seventh lens; P1, first spacer element; P2, second spacer element; P3, third spacer element; P4, fourth spacer element; P5, fifth spacer element; P6, sixth spacer element; P6b, sixth auxiliary spacer element; P6c, sixth sub auxiliary spacer element. DETAILED DESCRIPTION

[0067] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that the detailed description is only illustrative of exemplary embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0068] It is noted that, in this specification, the expressions first, second, third, etc. are merely used to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0069] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0070] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, 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 method in the art, for example, judging convex or concave by the sign of R value (R refers to the radius of curvature in the paraxial region). In the present specification, the surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side surface of the lens. In terms of 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. In terms of 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.

[0071] It should also be understood that the use of the terms "including", "including", "having", "containing", and / or "containing" when used in this specification means that the presence of the stated features, elements and / or components, but does 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 list of features, not individual elements of the list. In addition, when describing the embodiments of the present application, "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0072] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0073] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The following embodiments only express several embodiments of the present application, which are described in detail and specifically, but cannot be construed as limiting the scope of the patent of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0074] According to an aspect of the present application, as Figure 1A and Figure 1BAs shown, one embodiment of the present application provides an optical imaging device, comprising a lens barrel, and a lens group and a plurality of spacer elements accommodated in the lens barrel; the lens group comprises, arranged in order from the object side to the image side along the optical axis: a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power, a sixth lens with negative refractive power, and a seventh lens with negative refractive power; the plurality of spacer elements comprises 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, a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens.

[0075] In particular, the optical imaging device satisfies:

[0076] 4.65 < TD / f x tan(Semi-Fov) < 5.10; and

[0077] -0.95 < (d0s-EPD) / f1 < -0.70;

[0078] wherein TD is the on-axis distance from the object side surface of the first lens to the image side surface of the seventh lens, f is the effective focal length of the optical imaging device, Semi-Fov is half of the maximum field angle of the optical imaging device, f1 is the effective focal length of the first lens, EPD is the entrance pupil diameter of the optical imaging device, and d0s is the inner diameter of the object side surface of the lens barrel.

[0079] It is worth noting that the optical power of the seven lenses in the optical imaging device in the above embodiments of the present application is allocated as negative-positive-positive-positive-positive-negative-negative, and based on the imaging requirement of the ultra-wide angle, the optical imaging device satisfies the relationship 4.65 < TD / f x tan (Semi-Fov) < 5.10, at this time, the on-axis distance TD from the object side surface of the first lens to the image side surface of the seventh lens is much larger than the effective focal length f of the optical imaging device, the total length of the optical system is large, the barrel surface is easy to reflect the excess stray light to form excess noise points in the imaging surface, resulting in the details in the imaging image being blurred, and the imaging effect of the optical imaging device is poor. Therefore, the present application controls the ratio of the difference between the inner diameter of the object side surface of the barrel and the entrance pupil diameter of the optical imaging device and the focal length of the first lens to satisfy the relationship -0.95 < (d0s-EPD) / f1 < -0.70, reasonably controls the light incidence at the object side end of the imaging system, avoids the excess light from hitting the optical imaging device, reduces the reflection of the light by the barrel, suppresses the generation of stray light, and improves the imaging effect.

[0080] In addition, the object side surface and the image side surface of the first lens are convex and concave respectively; the object side surface and the image side surface of the second lens are concave and convex respectively; the object side surface of the third lens is convex; the object side surface and the image side surface of the fifth lens are both convex; the object side surface and the image side surface of the sixth lens are convex and concave respectively; and the object side surface and the image side surface of the seventh lens are convex and concave respectively.

[0081] Exemplarily, Figure 14A a spot diagram of the optical imaging device satisfying the relationship TD / f x tan (Semi-Fov) = 4.71 and (d0s-EPD) / f1 = -0.85 is shown; Figure 14B a ray path diagram of the optical imaging device satisfying the relationship TD / f x tan (Semi-Fov) = 4.71 and (d0s-EPD) / f1 = -0.85 is shown; Figure 15A a spot diagram of the optical imaging device satisfying the relationship TD / f x tan (Semi-Fov) = 4.71 and (d0s-EPD) / f1 = -1.10 is shown; Figure 15B a ray path diagram of the optical imaging device satisfying the relationship TD / f x tan (Semi-Fov) = 4.71 and (d0s-EPD) / f1 = -1.10 is shown; Figure 16A a spot diagram of the optical imaging device satisfying the relationship TD / f x tan (Semi-Fov) = 4.71 and (d0s-EPD) / f1 = -0.59 is shown; Figure 16B a ray path diagram of the optical imaging device satisfying the relationship TD / f x tan (Semi-Fov) = 4.71 and (d0s-EPD) / f1 = -0.59 is shown. As can be seen from the figure, Figure 14Aand Figure 14B As shown in FIG. 2, when the optical imaging device satisfies the relationship (d0s-EPD) / f1=-0.77, the ratio of (d0s-EPD) and f1 is in the range greater than -0.95 and less than -0.7, no stray light path appears in the optical path diagram, the noise of the imaging surface in the spot diagram is relatively less, and the imaging quality of the optical imaging device is better. Figure 15A and Figure 15B As shown in FIG. 2, when the optical imaging device satisfies the relationship (d0s-EPD) / f1=-1.00, the ratio of (d0s-EPD) and f1 is in the range less than or equal to -0.95, the difference between the object side surface diameter of the lens barrel surface and the entrance pupil diameter of the optical imaging device is larger, the object side inner diameter of the lens barrel is too large, a large amount of stray light enters the lens barrel, which causes bright arc stray light in the square region of the upper part of the imaging surface, and affects the imaging quality of the optical imaging device. Figure 16A and Figure 16B As shown in FIG. 2, when the optical imaging device satisfies the relationship (d0s-EPD) / f1=-0.40, the ratio of (d0s-EPD) and f1 is in the range greater than or equal to 0.7, the difference between the object side surface diameter of the lens barrel surface and the entrance pupil diameter is smaller, the object side inner diameter of the lens barrel is too small, the edge of the large-angle incident light is reflected on the object side end surface of the lens barrel, thereby generating a large amount of stray light, which causes bright arc stray light in the square region of the lower part of the imaging surface, and affects the imaging quality of the optical imaging device.

[0082] Preferably, the optical imaging device satisfies: 4.68≤TD / f×tan(Semi-Fov)≤5.09; and -0.91≤(d0s-EPD) / f1≤-0.74.

[0083] According to some embodiments of the present application, the optical imaging device satisfies: 0.3<(EP01-CT1) / R2<0.65; 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, R2 is the curvature radius of the image side surface of the first lens, and CT1 is the center thickness of the first lens.

[0084] In this way, by reasonably setting the values of the axial distance from the object side surface of the lens barrel to the object side surface of the first spacer element and the center thickness of the first lens and the value of the curvature radius of the image side surface of the first lens, the center curvature of the image side surface of the first lens is large, which causes the first lens to be thick at the edge and thin at the center. At this time, by setting a reasonable EP01 distance, the edge thickness of the non-effective diameter part of the first lens is limited to a certain extent, the edge stress condition of the first lens group is balanced during assembly, and thus the assembly stability of the lens is improved.

[0085] Preferably, the optical imaging device satisfies: 0.34≤(EP01-CT1) / R2≤0.64.

[0086] According to some embodiments of the present application, the optical imaging device satisfies: 1.85 < (R1-R2) / d1s≤3.85; wherein R1 is the radius of curvature of the object side surface of the first lens, R2 is the radius of curvature of the image side surface of the first lens, and d1s is the inner diameter of the object side surface of the first spacer element.

[0087] In this way, by reasonably controlling the values of the radius of curvature R1 of the object side surface and the radius of curvature R2 of the image side surface of the first lens, the spherical aberration and chromatic aberration of the first lens can be effectively controlled, and the imaging quality can be improved. When the ratio of the difference (R1-R2) between the radii of curvature of the object side surface and the image side surface of the first lens to the inner diameter d1s of the object side surface of the first spacer element is controlled within a certain range, the path of light can be controlled by the combination of the spacer element and the two side lenses, the generation of stray light can be reduced, and thus the imaging quality of the lens can be optimized.

[0088] Preferably, the optical imaging device satisfies: 1.89≤(R1-R2) / d1s≤3.85.

[0089] According to some embodiments of the present application, the optical imaging device satisfies: 0.30 < R2 / D1s < 0.60; and -3.70 < R3 / d1m < -0.90; wherein D1s is the outer diameter of the object side surface of the first spacer element, d1m is the inner diameter of the image side surface of the first spacer element, R2 is the radius of curvature of the image side surface of the first lens, and R3 is the radius of curvature of the object side surface of the second lens.

[0090] In this way, on the one hand, by controlling the relationship between the outer diameter D1s of the object side surface of the first spacer element and the radius of curvature R2 of the image side surface of the first lens, the incident angle and the refraction path of light passing through the image side of the first lens can be optimized, and the generation of stray light can be avoided. On the other hand, by controlling the relationship between the inner diameter d1m of the image side of the first spacer element and the radius of curvature R3 of the object side surface of the second lens, the inner diameter of the first spacer element can be reasonably set to ensure sufficient light quantity, and the light deficiency caused by the back shielding of light after passing through the first spacer element can be avoided, and the relative luminance is weakened and cannot meet the imaging requirements.

[0091] Preferably, the optical imaging device satisfies: 0.32≤R2 / D1s≤0.59; and -3.66≤R3 / d1m≤-0.93.

[0092] According to some embodiments of the present application, the optical imaging device satisfies: 0.15≤d2s / (f2-f3)<0.50; wherein d2s is the inner diameter of the object side surface of the second spacer element, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens.

[0093] In this way, by controlling the ratio of the effective focal length f2 of the second lens and the effective focal length f3 of the third lens to the inner diameter of the second spacer element, the path of the light rays between the second lens and the third lens can be controlled, the light rays can be prevented from being reflected by the second spacer element, chromatic aberration can be corrected, and the imaging quality can be improved. By controlling the inner diameter of the second spacer element, the chromatic aberration of the edge field of view of the optical imaging device can be improved, and the imaging quality can be improved.

[0094] Preferably, the optical imaging device satisfies: 0.15≤d2s / (f2-f3)≤0.46.

[0095] According to some embodiments of the present application, the optical imaging device satisfies: 1.45<(D3s-d3m) / CT3<6.85; wherein d3m is the image-side inner diameter of the third spacer element, D3s is the object-side outer diameter of the third spacer element, and CT3 is the center thickness of the third lens.

[0096] In this way, by controlling the ratio of the difference (D3s-d3m) between the object-side outer diameter and the image-side inner diameter of the third spacer element to the center thickness CT3 of the third lens to satisfy the range defined by the above relationship, the ring width of the third spacer element is limited, and the proportion of the third lens is limited, thereby reducing the deformation probability of the third spacer element during assembly.

[0097] Preferably, the optical imaging device satisfies: 1.48≤(D3s-d3m) / CT3≤6.84.

[0098] According to some embodiments of the present application, the optical imaging device satisfies: 0.90<(D4s-d4s) / (D3s-d3s)<1.35; wherein d4s is the object-side inner diameter of the fourth spacer element, D4s is the object-side outer diameter of the fourth spacer element, D3s is the object-side outer diameter of the third spacer element, and d3s is the object-side inner diameter of the third spacer element.

[0099] In this way, by controlling the ratio of the difference (D4s-d4s) between the object-side inner diameter and the object-side outer diameter of the fourth spacer element to the difference (D3s-d3s) between the object-side outer diameter and the object-side inner diameter of the third spacer element to satisfy the range defined by the above relationship, the ring width of the third spacer element is similar to the ring width of the fourth spacer element, the assembly balance of the object side and the image side of the fourth lens between the third spacer element and the fourth spacer element can be ensured, the optical imaging device can be more accurately and stably assembled, and the stability of the relative positions of the internal elements of the optical imaging device can be improved, thereby reducing the decline in optical performance caused by mechanical deviation.

[0100] Preferably, the optical imaging device satisfies: 0.94≤(D4s-d4s) / (D3s-d3s)≤1.32.

[0101] According to some embodiments of the present application, the optical imaging device satisfies: 0.45≤(d5s-d4m) / (DT51-DT42)<7.25; 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, DT51 is the effective diameter of the object-side light-transmitting portion of the fifth lens, and DT42 is the effective diameter of the image-side light-transmitting portion of the fourth lens.

[0102] In this way, by controlling the ratio of the difference (d5s-d4m) between the object-side inner diameter of the fifth spacer element and the image-side inner diameter of the fourth spacer element and the difference (DT51-DT42) between the effective diameter of the object-side light-transmitting portion of the fifth lens and the effective diameter of the image-side light-transmitting portion of the fourth lens to satisfy the range defined by the above relationship, it is possible to ensure that the required light flux of the optical imaging device is satisfied, to avoid problems such as insufficient light and non-uniform image field brightness caused by the fourth and fifth spacer elements blocking light, to avoid affecting the imaging contrast and definition, and to improve the overall imaging quality.

[0103] Preferably, the optical imaging device satisfies: 0.45≤(d5s-d4m) / (DT51-DT42)≤7.23.

[0104] According to some embodiments of the present application, the optical imaging device satisfies: 1.95<(D6s-d6s) / T67<3.45; wherein d6s is the object-side inner diameter of the sixth spacer element, D6s is the object-side outer diameter of the sixth spacer element, and T67 is the on-axis distance from the image-side of the sixth lens to the object-side of the seventh lens.

[0105] In this way, by controlling the relationship between the object-side inner diameter d6s and the object-side outer diameter D6s of the sixth spacer element and the on-axis distance T67 from the image-side of the sixth lens to the object-side of the seventh lens, it is possible to compensate for the slight changes in the sixth and seventh lenses during the molding process by controlling the on-axis distance T67 from the image-side of the sixth lens to the object-side of the seventh lens and the bandwidth of the spacer element between the sixth and seventh lenses, so that the performance of the optical imaging device satisfies the production requirements and improves the production yield.

[0106] Preferably, the optical imaging device satisfies: 1.96≤(D6s-d6s) / T67≤3.43.

[0107] According to some embodiments of the present application, the optical imaging device satisfies: 0

[0108] In this way, by controlling the image-side inner diameter d6m of the sixth spacer element to satisfy the above relationship, the stray light caused by refraction and reflection of the light rays can be avoided from the sixth lens and the seventh lens, and the extra light rays can be prevented from entering the imaging surface, so that the optical imaging device is prevented from presenting extra light spots and the imaging effect of the imaging device is improved.

[0109] Preferably, the optical imaging device satisfies: 0.02≤d6m / (f6-f7)≤0.32.

[0110] According to some embodiments of the present application, the optical imaging device satisfies: 1.05≤L / TD≤1.1; wherein L is the maximum height of the lens barrel, and TD is the on-axis distance from the object-side surface of the first lens to the image-side surface of the seventh lens.

[0111] In this way, by controlling the ratio of the maximum height L of the lens barrel and the on-axis distance TD from the object-side surface of the first lens to the image-side surface of the seventh lens to satisfy the range defined by the above relationship, the contact between the lens and the bearing table during the production of the optical imaging device can be avoided, and the appearance damage to the lens during the production process is greatly reduced, so that the imaging effect of the optical imaging device is affected, and the production yield of the optical imaging device is improved.

[0112] It should be noted that those skilled in the art should understand that the number of spacer elements constituting the optical imaging device can be changed without departing from the technical solutions claimed by the present application, so as to obtain the various results and advantages described in the present specification, which are not specifically limited by the present application. For example, according to the needs, the optical imaging device can also include other numbers of spacer elements different from those described in the above embodiments.

[0113] 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 ease of description, the following embodiments OBJ represent the object surface of the optical imaging device (not shown in the figure), 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, S8 represents the image-side surface of the fourth lens E4, S9 represents the object-side surface of the fifth lens E5, S10 represents the image-side surface of the fifth lens E5, S11 represents the object-side surface of the sixth lens E6, S12 represents the image-side surface of the sixth lens E6, S13 represents the object-side surface of the seventh lens E7, S14 represents the image-side surface of the seventh lens E7, S15 can represent the object-side surface of the optical filter (not shown in the figure), S16 can represent the image-side surface of the optical filter (not shown in the figure), and S17 represents the image surface of the optical imaging device (not shown in the figure).

[0114] Embodiment One

[0115] like Figure 2 As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens assembly and a plurality of spacer elements housed within the lens barrel P0. The lens assembly includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 arranged sequentially along the optical axis from the object side to the image side. The plurality of spacers include a first spacer P1 positioned 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 P2 positioned 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 P3 positioned 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 P4 positioned between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth lens E4; a fifth spacer P5 positioned between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface of the fifth lens E5; and a sixth spacer P6 positioned between the sixth lens E6 and the seventh lens E7 and in contact with the image-side surface of the sixth lens E6.

[0116] In this embodiment, the first lens E1 has negative optical power, and its object-side surface S1 and image-side surface S2 are convex and concave, respectively; the second lens E2 has positive optical power, and its object-side surface S3 and image-side surface S4 are concave and convex, respectively; the third lens E3 has positive optical power, and its object-side surface S5 and image-side surface S6 are both convex; the fourth lens E4 has positive optical power, and its object-side surface S7 and image-side surface S8 are both convex; the fifth lens E5 has positive optical power, and its object-side surface S9 and image-side surface S10 are both convex; the sixth lens E6 has negative optical power, and its object-side surface S11 and image-side surface S12 are convex and concave, respectively; the seventh lens E7 has negative optical power, and its object-side surface S13 and image-side surface S14 are both convex and concave, respectively.

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

[0118] Table 1: Basic Optical Parameters of the Optical Imaging Device in Example 1

[0119]

[0120] It is to be noted that the materials in Table 1 include the refractive index and the Abbe number, for example, the materials 1.58 and 33.80 of S1 in Table 1 represent the refractive index of the first lens E1 is 1.58 and the Abbe number is 33.80, respectively.

[0121] In this embodiment, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces, and the surface type x of each aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

[0122] ;

[0123] wherein x is the distance sag of the aspherical surface from the vertex of the aspherical surface at a position along the optical axis at a height h; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the inverse of the curvature radius R in Table 1 above); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below provides the high-order term 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 S14 in Embodiment 1.

[0124] Table 2: Aspherical surface coefficient table of the optical imaging device of Embodiment 1

[0125]

[0126] Embodiment 2

[0127] As shown in Figure 3 , in this embodiment, the optical imaging device includes a lens barrel P0 and a lens assembly and a plurality of spacer elements accommodated in the lens barrel P0, the lens assembly includes, arranged along the optical axis from the object side to the image side in sequence: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The plurality of spacer elements includes a first spacer element P1 disposed 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 disposed 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 disposed 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 disposed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4, a fifth spacer element P5 disposed between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5, and a sixth spacer element P6 disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6.

[0128] In this embodiment, the spacer element further comprises a sixth auxiliary spacer element P6b disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth spacer element P6.

[0129] It is worth noting that the optical imaging device of this embodiment two has the same optical parameters compared with the above-mentioned embodiment one, i.e. the basic optical parameter table of the optical imaging device of this embodiment two is the same as Table 1, and the aspherical surface coefficient table is the same as Table 2. The structural data of the optical imaging device of this embodiment two is shown in Table 8 below.

[0130] Specifically, the numerical values of each related structural parameter of this embodiment two and the above-mentioned embodiment one are shown in Table 8 below, respectively, and the plurality of structural parameters specifically include: the inner diameter d1s of the object side surface of the first spacer element P1; the outer diameter D1s of the object side surface of the first spacer element P1; the inner diameter d2s of the object side surface of the second spacer element P2; the inner diameter d3s of the object side surface of the third spacer element P3; the inner diameter d3m of the image side surface of the third spacer element P3; the outer diameter D3s of the object side surface of the third spacer element P3; the inner diameter d4s of the object side surface of the fourth spacer element P4; the inner diameter d4m of the image side surface of the fourth spacer element P4; the outer diameter D4s of the object side surface of the fourth spacer element P4; the inner diameter d5s of the object side surface of the fifth spacer element P5; the inner diameter d6s of the object side surface of the sixth spacer element P6; the inner diameter d6m of the image side surface of the sixth spacer element P6; the outer diameter D6s of the object side surface of the sixth spacer element P6; the inner diameter d0s of the object side of the lens barrel P0; 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; and the maximum height L of the lens barrel P0. It can be understood that the units of the numerical values of each parameter shown in Table 8 are millimeters (mm), and the schematic of each parameter in the structural diagram of the optical imaging device is shown in Figure 1A and Figure 1B .

[0131] Embodiment Three

[0132] As Figure 4As shown in the embodiment, the optical imaging device comprises a lens barrel P0, and a lens assembly and a plurality of spacer elements accommodated in the lens barrel P0. The lens assembly comprises, in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The plurality of spacer elements comprises 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, 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, and a sixth spacer element P6 disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth lens E6.

[0133] In the embodiment, the spacer elements further comprise a sixth auxiliary spacer element P6b disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth spacer element P6.

[0134] It is worth noting that the optical imaging device of the third embodiment has the same optical parameters as the first embodiment, i.e., the basic optical parameter table of the optical imaging device of the third embodiment is the same as Table 1, and the aspherical surface coefficient table is the same as Table 2. The numerical values of the respective relevant structural parameters in the third embodiment are shown in Table 8 below, and the specific description of the plurality of structural parameters is the same as the relevant description in the second embodiment, which will not be repeated here.

[0135] After testing, the on-axis chromatic aberration curves of the optical imaging devices in the first embodiment, the second embodiment, and the third embodiment are shown in FIG. 1, which represent the degree of deflection of the converging focal points of light rays of different wavelengths after passing through the optical imaging devices; the astigmatism curves of the optical imaging devices in the first embodiment, the second embodiment, and the third embodiment are shown in FIG. 2, which represent the meridional image surface curvature and the sagittal image surface curvature; the distortion curves of the optical imaging devices in the first embodiment, the second embodiment, and the third embodiment are shown in FIG. 3, which represent the distortion of the optical imaging devices at different field angles and the variation law thereof. Figure 5A Figure 5B Figure 5C Figure 5A Figure 5B Figure 5C It can be known from FIGS. 1-3 that the optical imaging devices in the first embodiment, the second embodiment, and the third embodiment can all achieve good imaging quality.​​​​​

[0136] Example 4

[0137] like Figure 6 As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens assembly and a plurality of spacer elements housed within the lens barrel P0. The lens assembly includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 arranged sequentially along the optical axis from the object side to the image side. The plurality of spacers include a first spacer P1 positioned 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 P2 positioned 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 P3 positioned 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 P4 positioned between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth lens E4; a fifth spacer P5 positioned between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface of the fifth lens E5; and a sixth spacer P6 positioned between the sixth lens E6 and the seventh lens E7 and in contact with the image-side surface of the sixth lens E6.

[0138] In this embodiment, the first lens E1 has negative optical power, and its object-side surface S1 and image-side surface S2 are convex and concave, respectively; the second lens E2 has positive optical power, and its object-side surface S3 and image-side surface S4 are concave and convex, respectively; the third lens E3 has positive optical power, and its object-side surface S5 and image-side surface S6 are both convex; the fourth lens E4 has positive optical power, and its object-side surface S7 and image-side surface S8 are both concave and convex, respectively; the fifth lens E5 has positive optical power, and its object-side surface S9 and image-side surface S10 are both convex; the sixth lens E6 has negative optical power, and its object-side surface S11 and image-side surface S12 are both convex and concave, respectively; the seventh lens E7 has negative optical power, and its object-side surface S13 and image-side surface S14 are both convex and concave, respectively.

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

[0140] Table 3: Basic optical parameters of the optical imaging device in Example 4

[0141]

[0142] In this embodiment, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces, and the surface type of each aspherical lens can be defined by the aspherical surface formula given in Embodiment One above. Table 4 below gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22 that can be used for each aspherical mirror surface S1 to S14 in Embodiment Four.

[0143] Table 4: Aspherical surface coefficient table of the optical imaging device of Embodiment Four

[0144]

[0145] Embodiment Five

[0146] As Figure 7 shown in the figure, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens assembly and a plurality of spacer elements accommodated in the lens barrel P0, the lens assembly includes, arranged in order along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The plurality of spacer elements 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, 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, and a sixth spacer element P6 disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth lens E6.

[0147] It is worth noting that, compared with Embodiment Four above, the optical imaging device of this embodiment has the same optical parameters, i.e., the basic optical parameter table of the optical imaging device of this embodiment is the same as Table 3, and the aspherical surface coefficient table is the same as Table 4. The numerical values of each relevant structural parameter in this embodiment are shown in Table 8 below, and the specific description of the plurality of structural parameters is the same as the relevant description in Embodiment Two above, which will not be repeated here.

[0148] Embodiment Six

[0149] As Figure 8As shown in this embodiment, the optical imaging device comprises a lens barrel P0, and a lens assembly and a plurality of spacer elements accommodated in the lens barrel P0. The lens assembly comprises, in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The plurality of spacer elements comprises 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, 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, and a sixth spacer element P6 disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth lens E6.

[0150] In this embodiment, the spacer elements further comprise a sixth auxiliary spacer element P6b disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth spacer element P6, and a sixth secondary auxiliary spacer element P6c disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth auxiliary spacer element P6b.

[0151] It is worth noting that, compared with the above-mentioned embodiment four, the optical imaging device of this embodiment six has the same optical parameters, i.e., the basic optical parameter table of the optical imaging device of this embodiment six is the same as Table 3, and the aspheric surface coefficient table is the same as Table 4. The numerical values of each relevant structural parameter in this embodiment six are shown in Table 8 below, and the specific description of the plurality of structural parameters is the same as the relevant description in the above-mentioned embodiment two, which will not be repeated here.

[0152] After testing: the on-axis chromatic aberration curves of the optical imaging devices in embodiment four, embodiment five and embodiment six are shown in Figure 9A , which represent the degree of deflection of the converging focus points of light rays of different wavelengths after passing through the optical imaging devices; the astigmatism curves of the optical imaging devices in embodiment four, embodiment five and embodiment six are shown in Figure 9B , which represent the meridional image surface curvature and the sagittal image surface curvature; the distortion curves of the optical imaging devices in embodiment four, embodiment five and embodiment six are shown in Figure 9C , which represent the distortion of the optical imaging devices at different field angles and the change rule thereof. According to Figure 9A , Figure 9B andFigure 9C It can be seen that the optical imaging devices in Embodiments 4, 5 and 6 can all achieve good imaging quality.

[0153] Example 7

[0154] like Figure 10 As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens assembly and a plurality of spacer elements housed within the lens barrel P0. The lens assembly includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 arranged sequentially along the optical axis from the object side to the image side. The plurality of spacers include a first spacer P1 positioned 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 P2 positioned 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 P3 positioned 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 P4 positioned between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth lens E4; a fifth spacer P5 positioned between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface of the fifth lens E5; and a sixth spacer P6 positioned between the sixth lens E6 and the seventh lens E7 and in contact with the image-side surface of the sixth lens E6.

[0155] In this embodiment, the spacing element further includes a sixth auxiliary spacing element P6b disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth spacing element P6, and a sixth secondary auxiliary spacing element P6c disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth auxiliary spacing element P6b.

[0156] In this embodiment, the first lens E1 has negative power, the object side S1 and the image side S2 of the first lens E1 are convex and concave respectively; the second lens E2 has positive power, the object side S3 and the image side S4 of the second lens E2 are concave and convex respectively; the third lens E3 has positive power, the object side S5 and the image side S6 of the third lens E3 are convex and concave respectively; the fourth lens E4 has positive power, the object side S7 and the image side S8 of the fourth lens E4 are convex and concave respectively; the fifth lens E5 has positive power, the object side S9 and the image side S10 of the fifth lens E5 are both convex; the sixth lens E6 has negative power, the object side S11 and the image side S12 of the sixth lens E6 are convex and concave respectively; the seventh lens E7 has negative power, the object side S13 and the image side S14 of the seventh lens E7 are convex and concave respectively.

[0157] In addition, Table 5 shows the basic optical parameters of the optical imaging device of embodiment seven, wherein the units of the radius of curvature and the thickness / distance are millimeters (mm).

[0158] Table 5: Basic optical parameters table of the optical imaging device of embodiment seven

[0159]

[0160] In this embodiment, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces, and the surface type of each aspherical lens can be defined by the aspherical formula given in the above embodiment one. The following Table 6 gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 which can be used for each aspherical mirror surface S1 to S14 in embodiment seven.

[0161] Table 6: Aspherical coefficient table of the optical imaging device of embodiment seven

[0162]

[0163] Embodiment eight

[0164] As Figure 11As shown, in this embodiment, the optical imaging device comprises a lens barrel P0, and a lens assembly and a plurality of spacer elements accommodated in the lens barrel P0. The lens assembly comprises, in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The plurality of spacer elements comprises 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, 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, and a sixth spacer element P6 disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth lens E6.

[0165] In this embodiment, the spacer elements further comprise a sixth auxiliary spacer element P6b disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth spacer element P6, and a sixth secondary auxiliary spacer element P6c disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth auxiliary spacer element P6b.

[0166] It is worth noting that, compared with the above-mentioned embodiment seven, the optical imaging device of this embodiment eight has the same optical parameters, i.e., the basic optical parameter table of the optical imaging device of this embodiment eight is the same as Table 5, and the aspherical surface coefficient table is the same as Table 6. The numerical values of each relevant structural parameter in this embodiment eight are shown in Table 8 below, and the specific description of the plurality of structural parameters is the same as the relevant description in the above-mentioned embodiment two, which will not be repeated here.

[0167] Embodiment nine

[0168] As Figure 12As shown in this embodiment, the optical imaging device comprises a lens barrel P0, and a lens assembly and a plurality of spacer elements accommodated in the lens barrel P0. The lens assembly comprises, in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The plurality of spacer elements comprises 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, 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, and a sixth spacer element P6 disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth lens E6.

[0169] In this embodiment, the spacer elements further comprise a sixth auxiliary spacer element P6b disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth spacer element P6, and a sixth secondary auxiliary spacer element P6c disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth auxiliary spacer element P6b.

[0170] It is worth noting that, compared with the above-mentioned embodiment seven, the optical imaging device of this embodiment nine has the same optical parameters, i.e., the basic optical parameter table of the optical imaging device of this embodiment nine is the same as Table 5, and the aspheric surface coefficient table is the same as Table 6. The numerical values of each relevant structural parameter in this embodiment nine are shown in Table 8 below, and the specific description of the plurality of structural parameters is the same as the relevant description in the above-mentioned embodiment two, which will not be repeated here.

[0171] After testing: the on-axis chromatic aberration curves of the optical imaging devices in embodiment seven, embodiment eight and embodiment nine are shown in Figure 13A , which represent the degree of deflection of the converging focus points of light rays of 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 shown in Figure 13B , which represent the meridional image surface curvature and the sagittal image surface curvature; the distortion curves of the optical imaging devices in embodiment seven, embodiment eight and embodiment nine are shown in Figure 13C , which represent the distortion of the optical imaging device under different field angles and the change rule thereof. According to Figure 13A , Figure 13B andFigure 13C It can be known that the optical imaging devices in Embodiment Seven, Embodiment Eight and Embodiment Nine can achieve good imaging quality.

[0172] In summary, in Embodiments One to Nine, the FNO, Semi-Fov, f, f1 to f7, EPD, DT42 and DT51 of the optical imaging devices and the optical imaging devices, respectively, are as shown in Table 7.

[0173] Table 7: System optical parameter table of the optical imaging device

[0174]

[0175] In addition, the structural parameters of the optical imaging devices in Embodiments One to Nine are specifically as shown in Table 8.

[0176] Table 8: Structural parameter table of the optical imaging device

[0177]

[0178] In summary, the optical imaging devices in Embodiments One to Nine satisfy the relationship shown in Table 9, which is specifically as shown in Table 9.

[0179] Table 9: Relationship table satisfied by the optical imaging device

[0180]

[0181] It is worth mentioning that, according to an aspect of the present application, an embodiment of the present application further provides a camera module, which can include the above-mentioned optical imaging device and a photosensitive element arranged on the image side of the optical imaging device for imaging. It can be understood that the photosensitive element mentioned in the present application can be but is not limited to being implemented as a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS), and the present application will not repeat it.

[0182] In addition, according to another aspect of the present application, one embodiment of the present application further provides an electronic device which can include the above-mentioned camera module and a processor, the camera module being communicatively connected to the processor, for acquiring image data and inputting the image data to the processor to be processed. It can be understood that the electronic device mentioned in the present application can be implemented as a device such as a mobile phone installed with the camera module, but is not limited thereto, and the present application will not be described hereinafter.

[0183] The technical features of the above embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not contradict each other, they should be considered within the scope of the present disclosure.

[0184] The above embodiments only express several implementation manners of the present application, and the description is specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that for those skilled in the art, some modifications 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 of the present application should be subject to the appended claims.

Claims

1. An optical imaging device, characterized by: An optical imaging device includes a lens barrel and a plurality of spacer elements accommodated within the lens barrel; the lens barrel includes, in order from an object side to an image side along an optical axis, a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, a fifth lens having a positive refractive power, a sixth lens having a negative refractive power, and a seventh lens having a negative refractive power; the plurality of spacer elements includes a first spacer element disposed between the first lens and the second lens and in contact with an image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and in contact with an image side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and in contact with an image side surface of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with an image side surface of the fourth lens, a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with an image side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with an image side surface of the sixth lens; The optical imaging device satisfies: 4.65 < TD / f x tan(Semi-Fov) < 5.10; and -0.95 < (d0s-EPD) / f1 < -0.70; where TD is an on-axis distance from an object side surface of the first lens to an image side surface of the seventh lens, f is an effective focal length of the optical imaging device, Semi-Fov is half of a maximum field angle of the optical imaging device, f1 is an effective focal length of the first lens, EPD is an entrance pupil diameter of the optical imaging device, and d0s is an inner diameter of an object side surface of the lens barrel.

2. The optical imaging device of claim 1, wherein, The optical imaging device satisfies: 0.3 < (EP01-CT1) / R2 < 0.65; where EP01 is an on-axis distance from an object side surface of the lens barrel to an object side surface of the first spacer element, R2 is a radius of curvature of an image side surface of the first lens, and CT1 is a center thickness of the first lens.

3. The optical imaging device of claim 1, wherein, The optical imaging device satisfies: 1.85 < (R1-R2) / d1s < 3.85; where R1 is a radius of curvature of an object side surface of the first lens, R2 is a radius of curvature of an image side surface of the first lens, and d1s is an inner diameter of an object side surface of the first spacer element.

4. The optical imaging device of claim 1, wherein, The optical imaging device satisfies: 0.30 < R2 / D1s < 0.60; and -3.70 < R3 / d1m < -0.90; where D1s is an outer diameter of an object side surface of the first spacer element, d1m is an inner diameter of an image side surface of the first spacer element, R2 is a radius of curvature of an image side surface of the first lens, and R3 is a radius of curvature of an object side surface of the second lens.

5. The optical imaging device of claim 1, wherein, The optical imaging device satisfies: 0.15 < d2s / (f2-f3) < 0.50; where d2s is an inner diameter of an object side surface of the second spacer element, f2 is an effective focal length of the second lens, and f3 is an effective focal length of the third lens.

6. The optical imaging device of claim 1, wherein, The optical imaging device satisfies: 1.45 < (D3s - d3m) / CT3 < 6.85; wherein d3m is an image-side inner diameter of the third spacer element, D3s is an object-side outer diameter of the third spacer element, and CT3 is a center thickness of the third lens.

7. The optical imaging device of claim 1, wherein, The optical imaging device satisfies: 0.90 < (D4s - d4s) / (D3s - d3s) < 1.35; wherein d4s is an object-side inner diameter of the fourth spacer element, D4s is an object-side outer diameter of the fourth spacer element, D3s is an object-side outer diameter of the third spacer element, and d3s is an object-side inner diameter of the third spacer element.

8. The optical imaging device of claim 1, wherein, The optical imaging device satisfies: 0.45 ≤ (d5s - d4m) / (DT51 - DT42) < 7.25; wherein d4m is an image-side inner diameter of the fourth spacer element, d5s is an object-side inner diameter of the fifth spacer element, DT51 is an effective diameter of an object-side light-transmitting portion of the fifth lens, and DT42 is an effective diameter of an image-side light-transmitting portion of the fourth lens.

9. The optical imaging device of claim 1, wherein, The optical imaging device satisfies: 1.95 < (D6s - d6s) / T67 < 3.45; wherein d6s is an object-side inner diameter of the sixth spacer element, D6s is an object-side outer diameter of the sixth spacer element, and T67 is an on-axis distance from an image-side of the sixth lens to an object-side of the seventh lens.

10. The optical imaging device of claim 1, wherein, The optical imaging device satisfies: 0 < d6m / (f6 - f7) < 0.35; wherein d6m is an image-side inner diameter of the sixth spacer element, f6 is an effective focal length of the sixth lens, and f7 is an effective focal length of the seventh lens.

11. The optical imaging device of claim 1, wherein, The optical imaging device satisfies: 1.05 ≤ L / TD ≤ 1.1; wherein L is a maximum height of the lens barrel, and TD is an on-axis distance from an object-side of the first lens to an image-side of the seventh lens.

Images