Optical imaging device

Abstract

This application provides an optical imaging device, including a lens barrel and a lens group and a plurality of spacer elements housed within the lens barrel; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with negative optical power; the plurality of spacer elements include a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, a fifth spacer element, and a sixth spacer element; the optical imaging device satisfies: 4.65 < TD / f × tan(Semi-Fov) < 5.1; and -0.95 < (d0s - EPD) / f1 < -0.70.

Description

Technical Field

[0001] This application relates to the field of optical device technology, and in particular to an optical imaging device. Background Technology

[0002] With the rapid development of optical imaging technology, optical imaging devices play a crucial role in the industrial field. They possess numerous advantages such as high precision, high speed, and high efficiency, and are widely used in industrial production due to their ability to provide clearer, more complete, and more efficient visual capture and recognition capabilities. In order to record key parameters and data during the production process in real time, the imaging quality of optical imaging devices has become particularly important.

[0003] However, traditional seven-element optical imaging devices, when required for ultra-wide-angle imaging, especially when the total length of the optical system is long, are prone to causing light to reflect within the optical imaging device, forming extra stray light and creating extra noise on the imaging surface, interfering with the image signal and resulting in a deterioration in the imaging effect of the optical imaging device. Summary of the Invention

[0004] One advantage of this application is that it provides an optical imaging device that can solve the problem of poor imaging effect caused by the reflection of light within the optical imaging device and the formation of extra stray light due to the large total length of the system in traditional seven-element ultra-wide-angle optical imaging devices.

[0005] On one hand, this application provides an optical imaging device, including a lens barrel and a lens group and a plurality of spacers housed within the lens barrel; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with negative optical power; the plurality of spacers include a first spacer positioned between the first lens and the second lens and in contact with the image side of the first lens, a spacer positioned between the object side and the image side of the second lens, and a spacer positioned between the object side and the image side of the third lens, and a spacer positioned between the object side and the image side of the third lens, and a spacer positioned between the object side and the image side of the fourth lens, and a spacer positioned between the object side and the image side of the fifth lens, arranged sequentially along the optical axis from the object side to the image side. The optical imaging device comprises: a second spacer element between the second lens and the third lens and in contact with the image-side surface of the second lens; a third spacer element between the third lens and the fourth lens and in contact with the image-side surface of the third lens; a fourth spacer element between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens; a fifth spacer element 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 between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens; the optical imaging device satisfies the following:

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

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

[0008] Wherein, TD is the axial distance from the object side of the first lens to the image side of the seventh lens, f is the effective focal length of the optical imaging device, Semi-Fov is half of the maximum field of view 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 of the lens barrel.

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

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

[0011] Wherein, EP01 is the axial distance from the object side of the lens barrel to the object side of the first spacer element, R2 is the radius of curvature of the image side of the first lens, and CT1 is the center thickness of the first lens.

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

[0013] 1.85 < (R1 - R2) / d1s ≤ 3.85;

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

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

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

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

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

[0019] 0.15≤d²s / (f²-f³)<0.50;

[0020] Wherein, d2s is the inner diameter of the object side 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.

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

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

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

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

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

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

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

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

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

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

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

[0032] Wherein, d6s is the inner diameter of the object side surface of the sixth spacer element, D6s is the outer diameter of the object side surface of the sixth spacer element, and T67 is the axial distance from the image side surface of the sixth lens to the object side surface of the seventh lens.

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

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

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

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

[0037] 1.05≤L / TD≤1.1;

[0038] Where L is the maximum height of the lens barrel, and TD is the axial distance from the object side of the first lens to the image side of the seventh lens.

[0039] In summary, in the above embodiments of this application, the optical power of the seven lenses in the optical imaging device is distributed in a negative-positive-positive-positive-positive-negative-negative manner. Based on the ultra-wide-angle imaging requirements, the optical imaging device satisfies the relationship 4.65 < TD / f × tan(Semi-Fov) < 5.10. At this time, since the axial distance TD from the object side of the first lens to the image side of the seventh lens is much greater 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 prone to reflecting excess stray light, thereby forming excess noise in the imaging plane, resulting in blurred details in the imaging image and deteriorating the imaging effect of the optical imaging device. Therefore, this application controls the ratio of the difference between the inner diameter of the object side of the lens barrel and the entrance pupil diameter of the optical imaging device to the focal length of the first lens to satisfy the relationship -0.95 < (d0s - EPD) / f1 < -0.70, thereby reasonably controlling the light incident situation at the object side of the imaging system, avoiding excess light from hitting the optical imaging device, reducing the reflection of light by the lens barrel, suppressing the generation of stray light, and improving the imaging effect. When the ratio of the difference between the inner diameter of the object side of the lens barrel and the entrance pupil diameter of the optical imaging device to the focal length of the first lens is less than the range specified by the above formula, the difference between the inner diameter of the object side of the lens barrel 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, and a large amount of stray light enters the lens barrel, resulting in bright arc stray light in the upper part of the imaging surface, which affects the imaging quality of the optical imaging device. When the ratio of the difference between the inner diameter of the object side of the lens barrel and the entrance pupil diameter of the optical imaging device to the focal length of the first lens is greater than the range specified by the above formula, the difference between the inner diameter of the object side of the lens barrel and the entrance pupil diameter is small. The inner diameter of the object side of the lens barrel is too small, and incident light rays at large angles at the edge are reflected at the object side end face of the lens barrel, thereby generating a large amount of stray light, resulting in bright arc stray light in the lower part of the imaging surface, which affects the imaging quality of the optical imaging device. Attached Figure Description

[0040] Figure 1A This is a schematic diagram of structural parameters of an optical imaging device according to one embodiment of this application;

[0041] Figure 1B This is a schematic diagram of another structural parameter of an optical imaging device according to one embodiment of this application;

[0042] Figure 2This is a schematic diagram of the structure of an optical imaging device according to Embodiment 1 of this application;

[0043] Figure 3 This is a schematic diagram of the structure of an optical imaging device according to Embodiment 2 of this application;

[0044] Figure 4 This is a schematic diagram of the structure of an optical imaging device according to Embodiment 3 of this application;

[0045] Figure 5A A schematic diagram of the on-axis chromatic aberration curves of the optical imaging apparatus according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown.

[0046] Figure 5B A schematic diagram of astigmatism curves of the optical imaging apparatus according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown;

[0047] Figure 5C A schematic diagram of the distortion curves of the optical imaging device according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown;

[0048] Figure 6 This is a schematic diagram of the structure of an optical imaging device according to Embodiment 4 of this application;

[0049] Figure 7 This is a schematic diagram of the structure of an optical imaging device according to Embodiment 5 of this application;

[0050] Figure 8 This is a schematic diagram of the structure of an optical imaging device according to Embodiment Six of this application;

[0051] Figure 9A A schematic diagram of the on-axis chromatic aberration curves of the optical imaging apparatus according to Embodiments 4, 5 and 6 of this application is shown.

[0052] Figure 9B A schematic diagram of astigmatism curves of the optical imaging apparatus according to Embodiments 4, 5 and 6 of this application is shown.

[0053] Figure 9C A schematic diagram of the distortion curves of the optical imaging apparatus according to Embodiments 4, 5 and 6 of this application is shown.

[0054] Figure 10 This is a schematic diagram of the structure of an optical imaging device according to Embodiment Seven of this application;

[0055] Figure 11 This is a schematic diagram of the structure of an optical imaging device according to Embodiment 8 of this application;

[0056] Figure 12 This is a schematic diagram of the structure of an optical imaging device according to Embodiment 9 of this application;

[0057] Figure 13A A schematic diagram of the on-axis chromatic aberration curves of the optical imaging apparatus according to Embodiments 7, 8 and 9 of this application is shown.

[0058] Figure 13B A schematic diagram of the astigmatism curves of the optical imaging apparatus according to Embodiments 7, 8 and 9 of this application is shown.

[0059] Figure 13C A schematic diagram of the distortion curves of the optical imaging apparatus according to Embodiments 7, 8 and 9 of this application is shown.

[0060] Figure 14A The image shows the spot pattern of the optical imaging device when TD / f×tan(Semi-Fov)=4.71 and (d0s-EPD) / f1=-0.85;

[0061] Figure 14B The optical path diagram of the optical imaging device is shown when TD / f×tan(Semi-Fov)=4.71 and (d0s-EPD) / f1=-0.85.

[0062] Figure 15A The optical imaging device is shown in the light pattern when TD / f×tan(Semi-Fov)=4.71 and (d0s-EPD) / f1=-1.10.

[0063] Figure 15B The optical path diagram of the optical imaging device is shown when TD / f×tan(Semi-Fov)=4.71 and (d0s-EPD) / f1=-1.10 is satisfied.

[0064] Figure 16A The image shows the spot pattern of the optical imaging device when TD / f×tan(Semi-Fov)=4.71 and (d0s-EPD) / f1=-0.59;

[0065] Figure 16B The optical path diagram of the optical imaging device is shown when TD / f×tan(Semi-Fov)=4.71 and (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 secondary auxiliary spacer element. Detailed Implementation

[0067] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0068] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0069] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0070] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to methods commonly used in the art, such as using the sign of the R value (R refers to the radius of curvature of the paraxial region) to determine concavity or convexity. In this paper, the surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens. For the object-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0071] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

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

[0073] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0074] According to one aspect of this application, such as Figure 1A and Figure 1BAs shown, one embodiment of this application proposes an optical imaging device, including a lens barrel and a lens group and a plurality of spacer elements housed within the lens barrel; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with negative optical power; the plurality of spacer elements include 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;

[0075] Specifically, the optical imaging device satisfies:

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

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

[0078] Wherein, TD is the axial distance from the object side of the first lens to the image side of the seventh lens, f is the effective focal length of the optical imaging device, Semi-Fov is half of the maximum field of view 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 of the lens barrel.

[0079] It is worth noting that in the above embodiments of this application, the optical power of the seven lenses in the optical imaging device is distributed in a negative-positive-positive-positive-positive-negative-negative manner. Based on the ultra-wide-angle imaging requirements, the optical imaging device satisfies the relationship 4.65 < TD / f × tan(Semi-Fov) < 5.10. At this time, the axial distance TD from the object side of the first lens to the image side of the seventh lens is much greater than the effective focal length f of the optical imaging device. The total length of the optical system is large, and the lens barrel surface is prone to reflecting excess stray light, thereby forming excess noise in the imaging plane. This results in the details in the image being blurred, thus degrading the imaging effect of the optical imaging device. Therefore, this application controls the ratio of the difference between the inner diameter of the object side of the lens barrel and the entrance pupil diameter of the optical imaging device to the focal length of the first lens to satisfy the relationship -0.95 < (d0s - EPD) / f1 < -0.70, thereby reasonably controlling the light incident situation at the object side of the imaging system, avoiding excess light from hitting the optical imaging device, reducing the reflection of light by the lens barrel, suppressing the generation of stray light, and improving the imaging effect.

[0080] Furthermore, the object-side surface and image-side surface of the first lens are convex and concave, respectively; the object-side surface and 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 image-side surface of the fifth lens are both convex; the object-side surface and image-side surface of the sixth lens are convex and concave, respectively; and the object-side surface and image-side surface of the seventh lens are convex and concave, respectively.

[0081] For example, Figure 14A The image shows the spot pattern of the optical imaging device when the relation TD / f×tan(Semi-Fov)=4.71 and (d0s-EPD) / f1=-0.85 is satisfied; Figure 14B The optical path diagram of the optical imaging device is shown when TD / f×tan(Semi-Fov)=4.71 and (d0s-EPD) / f1=-0.85. Figure 15A The image shows the spot pattern of the optical imaging device when the relation TD / f×tan(Semi-Fov)=4.71 and (d0s-EPD) / f1=-1.10 is satisfied; Figure 15B The optical path diagram of the optical imaging device is shown when TD / f×tan(Semi-Fov)=4.71 and (d0s-EPD) / f1=-1.10 is satisfied. Figure 16A The image shows the spot pattern of the optical imaging device when the relation TD / f×tan(Semi-Fov)=4.71 and (d0s-EPD) / f1=-0.59 is satisfied. Figure 16B The optical path diagram of the optical imaging device is shown when TD / f×tan(Semi-Fov)=4.71 and (d0s-EPD) / f1=-0.59. It is easy to see from the diagram that... Figure 14Aand Figure 14B As shown, when the optical imaging device satisfies the relationship (d0s-EPD) / f1=-0.77, the ratio of (d0s-EPD) to f1 is within the range of greater than -0.95 and less than -0.7. No stray light paths appear in the optical path diagram, and the noise on the imaging surface in the spot diagram is relatively small, indicating good imaging quality of the optical imaging device. Figure 15A and Figure 15B As shown, when the optical imaging device satisfies the relationship (d0s-EPD) / f1=-1.00, the ratio of (d0s-EPD) to f1 is within the range of less than or equal to -0.95. The difference between the object-side diameter of the lens barrel and the entrance pupil diameter of the optical imaging device is large, indicating an excessively large object-side inner diameter of the lens barrel. This allows a large amount of stray light to enter the lens barrel, resulting in bright arc stray light in the upper square area of ​​the imaging surface, thus affecting the imaging quality of the optical imaging device. Figure 16A and Figure 16B As shown, when the optical imaging device satisfies the relationship (d0s-EPD) / f1=-0.40, the ratio of (d0s-EPD) to f1 is within the range of greater than or equal to 0.7. The difference between the object side diameter and the entrance pupil diameter of the lens tube is small, the object side inner diameter of the lens tube is too small, and the incident light rays at large angles at the edge are reflected at the object side end face of the lens tube, thereby generating a large amount of stray light. This results in bright arc stray light in the square area of ​​the lower part of the imaging surface, which 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 this application, the optical imaging device satisfies: 0.3 < (EP01 - CT1) / R2 < 0.65; where EP01 is the axial distance from the object side of the lens barrel to the object side of the first spacer element, R2 is the radius of curvature of the image side of the first lens, and CT1 is the center thickness of the first lens.

[0084] In this way, by reasonably setting the axial distance from the object side of the lens barrel to the object side of the first spacer element, the value of the center thickness of the first lens, and the value of the radius of curvature of the image side of the first lens, the center curvature of the image side of the first lens is large, resulting in the first lens being thin at the center and thick at the edge. 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, balancing the edge stress during the assembly of the first lens, thereby improving the assembly stability of the lens.

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

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

[0087] In this way, by reasonably controlling the values ​​of the radius of curvature R1 of the object side and the radius of curvature R2 of the image side of the first lens, the spherical aberration and chromatic aberration of the first lens can be effectively controlled, thereby improving the image quality. When the ratio of the difference between the radii of curvature of the object side and the image side of the first lens (R1-R2) to the inner diameter d1s of the object side 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 lenses on both sides, reducing the generation of stray light and thus optimizing the image quality of the lens.

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

[0089] According to some embodiments of this 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 of the first spacer element, d1m is the inner diameter of the image side of the first spacer element, R2 is the radius of curvature of the image side of the first lens, and R3 is the radius of curvature of the object side 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 of the first spacer element and the radius of curvature R2 of the image side of the first lens, the incident angle and refraction path of light passing through the image side of the first lens can be optimized to avoid the generation of stray light. 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 of the second lens, the inner diameter of the first spacer element can be reasonably set to ensure sufficient light transmission and avoid insufficient light caused by light being blocked behind the first spacer element, resulting in reduced relative illumination and failure to meet 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 this application, the optical imaging device satisfies: 0.15≤d2s / (f2-f3)<0.50; where d2s is the inner diameter of the object side 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 between the effective focal length f2 of the second lens and the effective focal length f3 of the third lens and the inner diameter of the second spacer element, the path of light between the second lens and the third lens can be controlled, avoiding the light being reflected by the second spacer element. At the same time, it is beneficial to correct chromatic aberration and improve imaging quality. By controlling the inner diameter of the second spacer element, the chromatic aberration at the edge field of view of the optical imaging device can be improved, thereby enhancing imaging quality.

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

[0095] According to some embodiments of this application, the optical imaging device satisfies: 1.45 < (D3s - d3m) / CT3 < 6.85; where d3m is the inner diameter of the image side of the third spacer element, D3s is the outer diameter of the object side 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 between the outer diameter of the object side and the inner diameter of the image side of the third spacer (D3s-d3m) and the center thickness CT3 of the third lens to satisfy the range defined by the above relationship, the annular width of the third spacer element is limited on the one hand, and the specific gravity of the third lens is limited on the other hand, 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 this application, the optical imaging device satisfies: 0.90 < (D4s - d4s) / (D3s - d3s) < 1.35; where d4s is the inner diameter of the object side of the fourth spacer element, D4s is the outer diameter of the object side of the fourth spacer element, D3s is the outer diameter of the object side of the third spacer element, and d3s is the inner diameter of the object side of the third spacer element.

[0099] In this way, by controlling the ratio of the difference between the inner diameter and the outer diameter of the object side of the fourth spacer (D4s-d4s) and the difference between the outer diameter and the inner diameter of the object side of the third spacer (D3s-d3s) to satisfy the range defined by the above relationship, the bandwidth of the third spacer and the bandwidth of the fourth spacer are made similar. This ensures the assembly balance of the object side and the image side of the fourth lens, which is located between the two. This ensures that the optical imaging device is assembled more accurately and stably, thereby improving the stability of the relative positions of the internal components of the optical imaging device and 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 this application, the optical imaging device satisfies: 0.45≤(d5s-d4m) / (DT51-DT42)<7.25; where d4m is the inner diameter of the image-side surface of the fourth spacer element, d5s is the inner diameter of the object-side surface of the fifth spacer element, DT51 is the effective diameter of the light-transmitting portion of the object-side surface of the fifth lens, and DT42 is the effective diameter of the light-transmitting portion of the image-side surface of the fourth lens.

[0102] In this way, by controlling the ratio of the difference between the inner diameter of the object side of the fifth spacer and the inner diameter of the image side of the fourth spacer (d5s-d4m) and the difference between the effective diameter of the light-transmitting part of the object side of the fifth lens and the effective diameter of the light-transmitting part of the image side of the fourth lens (DT51-DT42) to satisfy the range defined by the above relationship, it is possible to ensure that the light transmission required by the optical imaging device is met, avoid problems such as insufficient light and uneven image field brightness caused by the fourth and fifth spacers blocking light, avoid affecting the imaging contrast and sharpness, and 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 this application, the optical imaging device satisfies: 1.95 < (D6s - d6s) / T67 < 3.45; where d6s is the inner diameter of the object side surface of the sixth spacer element, D6s is the outer diameter of the object side surface of the sixth spacer element, and T67 is the axial distance from the image side surface of the sixth lens to the object side surface of the seventh lens.

[0105] In this way, by controlling the relationship between the inner diameter d6s and outer diameter D6s of the object side of the sixth spacer element and the axial distance from the image side of the sixth lens to the object side of the seventh lens, the slight changes brought about by the molding process of the sixth and seventh lenses can be compensated by controlling the axial 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. This allows the performance of the optical imaging device to meet production requirements and improve the production yield.

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

[0107] According to some embodiments of this application, the optical imaging device satisfies: 0 < d6m / (f6-f7) < 0.35; where d6m is the inner diameter of the image side of the sixth spacer element, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0108] In this way, by controlling the inner diameter d6m of the image side of the sixth spacer element to satisfy the above relationship, the stray light generated by the refraction and reflection of light can avoid the sixth lens and other lenses, thus preventing excess light from entering the imaging surface and causing the optical imaging device to exhibit excess light spots, which would degrade the imaging effect of the imaging device.

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

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

[0111] In this way, by controlling the ratio of the maximum height L of the lens barrel to the axial distance TD between the object side of the first lens and the image side of the seventh lens to meet the range defined by the above relationship, it is possible to avoid contact between the lens and the support stage during the production of the optical imaging device, greatly reduce the appearance damage to the lens during the production process, and improve the imaging effect of the optical imaging device, thereby improving the production yield of the optical imaging device.

[0112] It should be noted that those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of spacers constituting the optical imaging device can be changed to obtain the various results and advantages described in this specification, and this application does not specifically limit this. For example, as needed, the optical imaging device may also include other numbers of spacers than those described in the above embodiments.

[0113] The following describes in more detail some specific, non-limiting embodiments of the above-described embodiments of this application with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ represents the object plane of the optical imaging device (not shown in the figure), S1 represents the object-side plane of the first lens E1, S2 represents the image-side plane of the first lens E1, S3 represents the object-side plane of the second lens E2, S4 represents the image-side plane of the second lens E2, S5 represents the object-side plane of the third lens E3, S6 represents the image-side plane of the third lens E3, S7 represents the object-side plane of the fourth lens E4, S8 represents the image-side plane of the fourth lens E4, S9 represents the object-side plane of the fifth lens E5, S10 represents the image-side plane of the fifth lens E5, S11 represents the object-side plane of the sixth lens E6, S12 represents the image-side plane of the sixth lens E6, S13 represents the object-side plane of the seventh lens E7, S14 represents the image-side plane of the seventh lens E7, S15 may represent the object-side plane of a filter (not shown in the figure), S16 may represent the image-side plane of a filter (not shown in the figure), and S17 represents the image plane of the optical imaging device (not shown in the figure).

[0114] Example 1

[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 should be noted that the materials in Table 1 include refractive index and Abbe number. For example, in Table 1, the materials 1.58 and 33.80 of S1 indicate that 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 surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0122] ;

[0123] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical mirrors S1 to S14 in Example 1.

[0124] Table 2: Aspherical Coefficients of the Optical Imaging Device in Example 1

[0125]

[0126] Example 2

[0127] like Figure 3 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.

[0128] In this embodiment, the spacer element further includes a sixth auxiliary spacer element P6b, which is placed between the sixth lens E6 and the seventh lens E7 and contacts the image side of the sixth spacer element P6.

[0129] It is worth noting that, compared with Embodiment 1 above, the optical imaging device of Embodiment 2 has the same optical parameters, that is, the basic optical parameter table of the optical imaging device of Embodiment 2 is the same as Table 1, and the aspheric coefficient table is the same as Table 2. The structural data of the optical imaging device of Embodiment 2 are shown in Table 8 below.

[0130] Specifically, the values ​​of various related structural parameters in this embodiment and in the above embodiment are shown in Table 8 below. These 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; and the inner diameter of the object-side surface of the fourth spacer element P4. The following parameters are listed: d4s (image-side inner diameter of the fourth spacer P4); d4m (object-side outer diameter of the fourth spacer P4); D4s (object-side inner diameter of the fifth spacer P5); d5s (object-side inner diameter of the fifth spacer P5); d6s (object-side inner diameter of the sixth spacer P6); d6m (image-side inner diameter of the sixth spacer P6); D6s (object-side outer diameter of the sixth spacer P6); d0s (object-side inner diameter of the lens barrel P0); EP01 (axial distance from the object-side surface of the lens barrel P0 to the object-side surface of the first spacer P1); and L (maximum height of the lens barrel P0). It is understood that the units for the values ​​of each parameter shown in Table 8 are millimeters (mm), and the schematic representations of each parameter in the structural diagram of the optical imaging device are as follows: Figure 1A and Figure 1B As shown.

[0131] Example 3

[0132] like Figure 4As 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.

[0133] In this embodiment, the spacer element further includes a sixth auxiliary spacer element P6b, which is placed between the sixth lens E6 and the seventh lens E7 and contacts the image side of the sixth spacer element P6.

[0134] It is worth noting that, compared with Embodiment 1 above, the optical imaging device of Embodiment 3 has the same optical parameters. That is, the basic optical parameter table of the optical imaging device of Embodiment 3 is the same as Table 1, and the aspherical coefficient table is the same as Table 2. The values ​​of each relevant structural parameter in Embodiment 3 are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0135] After testing, the on-axis chromatic aberration curves of the optical imaging devices in Examples 1, 2, and 3 are as follows: Figure 5A As shown, it represents the degree of deviation of the focal point after light of different wavelengths passes through the optical imaging device; the astigmatism curves of the optical imaging devices in Embodiments 1, 2, and 3 are shown below. Figure 5B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical imaging devices in Embodiments 1, 2, and 3 are as follows. Figure 5C As shown, it illustrates the distortion of an optical imaging device at different field of view angles and its variation patterns. According to... Figure 5A , Figure 5B and Figure 5C It can be seen that the optical imaging devices in Embodiment 1, Embodiment 2 and Embodiment 3 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 image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 that can be used for each aspherical mirror S1 to S14 in Embodiment 4.

[0143] Table 4: Aspherical coefficients of the optical imaging device in Example 4

[0144]

[0145] Example 5

[0146] like Figure 7 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.

[0147] It is worth noting that, compared with Embodiment 4 above, the optical imaging device of Embodiment 5 has the same optical parameters. That is, the basic optical parameter table of the optical imaging device of Embodiment 5 is the same as Table 3, and the aspherical coefficient table is the same as Table 4. The values ​​of each relevant structural parameter in Embodiment 5 are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0148] Example 6

[0149] like Figure 8As 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.

[0150] 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.

[0151] It is worth noting that, compared with Embodiment 4 above, the optical imaging device of Embodiment 6 has the same optical parameters. That is, the basic optical parameter table of the optical imaging device of Embodiment 6 is the same as Table 3, and the aspherical coefficient table is the same as Table 4. The values ​​of each relevant structural parameter in Embodiment 6 are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0152] After testing, the on-axis chromatic aberration curves of the optical imaging devices in Examples 4, 5, and 6 are as follows: Figure 9A As shown, it represents the degree of deviation of the focal point after light of different wavelengths passes through the optical imaging device; the astigmatism curves of the optical imaging devices in Embodiments 4, 5, and 6 are shown below. Figure 9B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical imaging devices in Embodiments 4, 5, and 6 are as follows. Figure 9C As shown, it illustrates the distortion of an optical imaging device at different field of view angles and its variation patterns. According to... Figure 9A , Figure 9B and Figure 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 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 convex and concave, respectively; the fourth lens E4 has positive optical power, and its object-side surface S7 and image-side surface S8 are both convex and concave, 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 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.

[0157] In addition, Table 5 shows the basic optical parameters of the optical imaging device of Embodiment 7, wherein the units of radius of curvature and thickness / distance are millimeters (mm).

[0158] Table 5: Basic Optical Parameters of the Optical Imaging Device in Example 7

[0159]

[0160] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Table 6 below gives the higher-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 S1 to S14 in Embodiment 7.

[0161] Table 6: Aspherical Coefficients of the Optical Imaging Device in Example 7

[0162]

[0163] Example 8

[0164] like Figure 11As 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.

[0165] 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.

[0166] It is worth noting that, compared with Embodiment Seven above, the optical imaging device of Embodiment Eight has the same optical parameters. That is, the basic optical parameter table of the optical imaging device of Embodiment Eight is the same as Table 5, and the aspherical coefficient table is the same as Table 6. The values ​​of each relevant structural parameter in Embodiment Eight are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as those in Embodiment Two above, and will not be repeated here.

[0167] Example 9

[0168] like Figure 12As 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.

[0169] 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.

[0170] It is worth noting that, compared with Embodiment 7 above, the optical imaging device of Embodiment 9 has the same optical parameters, that is, the basic optical parameter table of the optical imaging device of Embodiment 9 is the same as Table 5, and the aspherical coefficient table is the same as Table 6. The values ​​of each relevant structural parameter in Embodiment 9 are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as the relevant descriptions in Embodiment 2 above, and will not be repeated here.

[0171] After testing, the on-axis chromatic aberration curves of the optical imaging devices in Examples 7, 8, and 9 are as follows: Figure 13A As shown, it represents the degree of deviation of the focal point after light of different wavelengths passes through the optical imaging device; the astigmatism curves of the optical imaging devices in Embodiments 7, 8, and 9 are shown below. Figure 13B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical imaging devices in Embodiments 7, 8, and 9 are as follows. Figure 13C As shown, it illustrates the distortion of an optical imaging device at different field of view angles and its variation patterns. According to... Figure 13A , Figure 13B and Figure 13C It can be seen that the optical imaging devices in Embodiments 7, 8 and 9 can all achieve good imaging quality.

[0172] In summary, in Embodiments 1 to 9, the aperture coefficient FNO of the optical imaging device, half of the maximum field of view of the optical lens (Semi-Fov), the effective focal length f of the optical imaging device, and the effective focal lengths f1 to f7 of the first lens E1 to the seventh lens E7 in the optical imaging device, the entrance pupil diameter EPD of the optical imaging device, the effective diameter DT42 of the image side of the fourth lens E4, and the effective diameter DT51 of the object side of the fifth lens E5 are shown in Table 7 below.

[0173] Table 7: System Optical Parameters of Optical Imaging Device

[0174]

[0175] Furthermore, the structural parameters of the optical imaging devices in Examples 1 to 9 are shown in Table 8.

[0176] Table 8: Structural Parameters of Optical Imaging Devices

[0177]

[0178] In summary, the optical imaging devices in Embodiments 1 to 9 satisfy the relationships shown in Table 9, as detailed in Table 9.

[0179] Table 9: Relationships Satisfying Optical Imaging Devices

[0180]

[0181] It is worth mentioning that, according to one aspect of this application, one embodiment of this application further provides a camera module, which may include the aforementioned optical imaging device and a photosensitive element, the photosensitive element being disposed on the image side of the optical imaging device for imaging. It is understood that the photosensitive element mentioned in this application may, but is not limited to, be implemented as a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) device, and this application will not elaborate further on this.

[0182] Furthermore, according to another aspect of this application, one embodiment of this application provides an electronic device that may include a camera module and a processor as described above. The camera module is communicatively connected to the processor for acquiring image data and inputting the image data into the processor for processing. It is understood that the electronic device mentioned in this application may, but is not limited to, a device such as a mobile phone equipped with the camera module, and this application will not elaborate further on this.

[0183] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0184] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An optical imaging device, characterized in that: The system includes a lens barrel and a lens assembly and multiple spacer elements housed within the lens barrel. The lens assembly comprises, arranged sequentially along the optical axis from the object side to the image side, a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with negative optical power. The multiple spacer elements include a first spacer element positioned between the first lens and the second lens and in contact with the image side of the first lens; a second spacer element positioned between the second lens and the third lens and in contact with the image side of the second lens; a third spacer element positioned between the third lens and the fourth lens and in contact with the image side of the third lens; a fourth spacer element positioned between the fourth lens and the fifth lens and in contact with the image side of the fourth lens; a fifth spacer element positioned between the fifth lens and the sixth lens and in contact with the image side of the fifth lens; and a sixth spacer element positioned between the sixth lens and the seventh lens and in contact with the image side of the sixth lens. The optical imaging device satisfies: 4.65<TD / f×tan(Semi-Fov)<5.10; -0.95 < (d0s - EPD) / f1 < -0.70; and 0 < d6m / (f6-f7) < 0.35; Wherein, TD is the axial 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 of view 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, d0s is the inner diameter of the object-side surface of the lens barrel, d6m is the inner diameter of the image-side surface of the sixth spacer element, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

2. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 0.3 < (EP01 - CT1) / R2 < 0.65; Wherein, EP01 is the axial distance from the object side of the lens barrel to the object side of the first spacer element, R2 is the radius of curvature of the image side of the first lens, and CT1 is the center thickness of the first lens.

3. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 1.85 < (R1 - R2) / d1s ≤ 3.85; Wherein, R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, and d1s is the inner diameter of the object side of the first spacer element.

4. The optical imaging device according to claim 1, characterized in that, 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 of the first spacer element, d1m is the inner diameter of the image side of the first spacer element, R2 is the radius of curvature of the image side of the first lens, and R3 is the radius of curvature of the object side of the second lens.

5. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 0.15≤d²s / (f²-f³)<0.50; Wherein, d2s is the inner diameter of the object side 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.

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

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

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

9. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 1.95<(D6s-d6s) / T67<3.45; Wherein, d6s is the inner diameter of the object side surface of the sixth spacer element, D6s is the outer diameter of the object side surface of the sixth spacer element, and T67 is the axial distance from the image side surface of the sixth lens to the object side surface of the seventh lens.

10. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 1.05≤L / TD≤1.1; Where L is the maximum height of the lens barrel, and TD is the axial distance from the object side of the first lens to the image side of the seventh lens.

Images