Optical imaging device

Abstract

The application provides an optical imaging device, which comprises a first optical element group and a second optical element group in sequence from an object side to an image side along an optical axis direction, the first optical element group is a movable group capable of moving along the optical axis direction, and the second optical element group is a fixed group; the first optical element group comprises a first lens barrel and a first lens with positive refractive power, a second lens with negative refractive power and a third lens with positive refractive power which are assembled in the first lens barrel; the second optical element group comprises a second lens barrel and a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power, a sixth spacer element and a seventh lens with negative refractive power which are assembled in the second lens barrel; the sixth spacer element is arranged between the sixth lens and the seventh lens and is in contact with an image side surface of the sixth lens; and the optical imaging device satisfies: -5.25 < R12 / d6s < -3.40.

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 development of smartphone camera technology, magnetic camera modules for mobile phones have effectively expanded the shooting capabilities of mobile terminals due to their portability and ease of use, while also being compact, portable, and cost-effective. However, in existing technologies, the mismatch between the curvature of the lens surface and the size of the spacer element results in a large angle of refraction when light passes through the lens, leading to an uneven light transition and difficulty in effectively correcting chromatic aberration, thus affecting image sharpness and contrast. Furthermore, an unreasonable structural design causes excessive sensitivity of the lens elements, making manufacturing difficult and resulting in low yield rates. Temperature changes also easily cause image drift, affecting image stability. In addition, improper design of the spacer element's inner diameter makes it difficult to balance stray light interception and main ray illumination, resulting in insufficient image uniformity. Summary of the Invention

[0003] This application provides an optical imaging device, which includes a first optical element group and a second optical element group sequentially from the object side to the image side along the optical axis. The first optical element group is a movable group that can move along the optical axis, and the second optical element group is a fixed group. The first optical element group includes a first lens barrel and a first lens, a second lens, and a third lens assembled within the first lens barrel. The first lens has positive optical power, and the object side of the first lens is convex. The second lens has negative optical power. The third lens has positive optical power. The second optical element group includes a second lens barrel and a fourth lens and a fifth lens assembled within the second lens barrel. The optical imaging device comprises a fourth lens, a sixth lens, a sixth spacer element, and a seventh lens; the fourth lens has positive optical power; the fifth lens has negative optical power; the sixth lens has positive optical power and its image-side surface is convex; the seventh lens has negative optical power and its image-side surface is concave; the sixth spacer element is disposed between the sixth lens and the seventh lens and contacts the image-side surface of the sixth lens; the optical imaging device satisfies: -5.25 < R12 / d6s < -3.40; where R12 is the radius of curvature of the image-side surface of the sixth lens, and d6s is the inner diameter of the object-side surface of the sixth spacer element.

[0004] In some embodiments of this application, the first optical element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image side of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image side of the second lens. The second lens is made of glass, and the optical imaging device satisfies: 1.25 < EP12 / CT2 < 1.40; where EP12 is the distance between the image side of the first spacer element and the object side of the second spacer element along the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

[0005] In some embodiments of this application, the first optical element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image side of the first lens; the optical imaging device satisfies: 1.25 < CT1 / T12 < 1.75; and -3.10 < f2 / d1s < -2.30; wherein, CT1 is the center thickness of the first lens on the optical axis, T12 is the air gap between the first lens and the second lens on the optical axis, f2 is the effective focal length of the second lens, and d1s is the inner diameter of the object side of the first spacer element.

[0006] In some embodiments of this application, the second optical element group further includes 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; the optical imaging device satisfies: 3.35 < R8 / d4s < 4.25; where R8 is the radius of curvature of the image-side surface of the fourth lens, and d4s is the inner diameter of the object-side surface of the fourth spacer element.

[0007] In some embodiments of this application, the optical imaging device satisfies: 1.50 < d6s / (D6s-d6s) < 3.45; where d6s is the inner diameter of the object side surface of the sixth spacer element, and D6s is the outer diameter of the object side surface of the sixth spacer element.

[0008] In some embodiments of this application, the second optical element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens; the optical imaging device satisfies: 1.00 < EP56 / T56 < 1.20; wherein, EP56 is the distance between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element along the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

[0009] In some embodiments of this application, the second optical element group further includes 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; the optical imaging device satisfies: 2.20 < D4s / DT42 < 2.70; where D4s is the outer diameter of the object-side surface of the fourth spacer element, and DT42 is the maximum radius of the optically effective portion of the image-side surface of the fourth lens.

[0010] In some embodiments of this application, the second optical element group further includes 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; the optical imaging device satisfies: 3.35 < R8 / d4m < 4.45; where R8 is the radius of curvature of the image-side surface of the fourth lens, and d4m is the inner diameter of the image-side surface of the fourth spacer element.

[0011] In some embodiments of this application, the first optical element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image side of the second lens; the optical imaging device satisfies: 2.15 < d2s / TH2 < 2.80; where d2s is the inner diameter of the object side of the second spacer element, and TH2 is the width of the non-effective diameter of the second lens parallel to the optical axis.

[0012] In some embodiments of this application, the second optical element group further includes 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; the optical imaging device satisfies: 0.90 < CT4 / EPb4 < 1.25; wherein, CT4 is the center thickness of the fourth lens on the optical axis, and EPb4 is the distance along the optical axis from the object side end face of the second lens barrel to the object side surface of the fourth spacer element.

[0013] In some embodiments of this application, the first optical element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image side of the first lens; the optical imaging device satisfies: 4.60 < f1 / d1s < 15.35; where f1 is the effective focal length of the first lens and d1s is the inner diameter of the object side of the first spacer element.

[0014] In some embodiments of this application, the second optical element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, and a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens; the fifth lens is made of plastic, and the optical imaging device satisfies: 1.45 < EP45 / CT5 < 1.90; where EP45 is the distance between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

[0015] In some embodiments of this application, the optical imaging device satisfies: -11.95 < R12 / T67 < -8.05; where R12 is the radius of curvature of the image side of the sixth lens, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

[0016] In some embodiments of this application, the optical imaging device satisfies: 2.25 < R13 / f7 < 6.40; where R13 is the radius of curvature of the object side surface of the seventh lens, and f7 is the effective focal length of the seventh lens.

[0017] In some embodiments of this application, the width of the non-effective diameter of the second lens parallel to the optical axis is greater than the width of the non-effective diameter of the other lenses parallel to the optical axis.

[0018] In summary, the optical imaging device of this application has seven lenses whose optical power is distributed in a positive-negative-positive-positive-negative-positive-negative-positive pattern, satisfying the relationship -5.25 < R12 / d6s < -3.40. By constraining the radius of curvature of the image side of the sixth lens and the inner diameter of the object side of the sixth spacer element to satisfy the above ratio, the image side of the sixth lens with a smaller curvature is matched with a spacer element with a suitable inner diameter, blocking excess light. This helps to control the light emission angle within a reasonable range, making the light transition smoother. According to the fourth power law of illuminance, this also ensures a smooth illuminance transition, thereby effectively correcting chromatic aberration within the entire aperture, ensuring image clarity and contrast, and reducing the lens sensitivity of the sixth lens. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of parameters of an optical imaging device according to one embodiment of this application; Figure 2 This is a schematic diagram of the structure of an optical imaging device according to one embodiment of this application; Figure 3A This is a schematic diagram of the structure of the optical imaging device according to Embodiment 1 of this application when the lens is in telephoto mode; Figure 3BThis is a schematic diagram of the optical imaging device according to Embodiment 1 of this application when the lens is in macro mode; Figure 4A This is a schematic diagram of the optical imaging device according to Embodiment 2 of this application when the lens is in telephoto mode; Figure 4B This is a schematic diagram of the optical imaging device according to Embodiment 2 of this application when the lens is in macro mode; Figure 5A This is a schematic diagram of the optical imaging device according to Embodiment 3 of this application when the lens is in telephoto mode; Figure 5B This is a schematic diagram of the optical imaging device according to Embodiment 3 of this application when the lens is in macro mode; Figure 6A The on-axis chromatic aberration curves of the optical imaging apparatus according to Embodiments 1, 2 and 3 of this application are shown when the lens is in telephoto mode; Figure 6B The astigmatism curves of the optical imaging device in the above-described embodiments 1, 2 and 3 according to this application are shown when the lens is in telephoto mode; Figure 6C The distortion curves of the optical imaging device in the above-described embodiments 1, 2 and 3 according to this application are shown when the lens is in telephoto mode; Figure 6D The magnification chromatic aberration curves of the optical imaging device in the above-described embodiments 1, 2 and 3 according to this application are shown when the lens is in telephoto mode; Figure 7A The on-axis chromatic aberration curves of the optical imaging device in the macro mode of Embodiments 1, 2 and 3 of this application are shown. Figure 7B The astigmatism curves of the optical imaging device in the macro mode of Embodiments 1, 2 and 3 of this application are shown. Figure 7C The distortion curves of the optical imaging device in the macro mode of Embodiments 1, 2 and 3 according to this application are shown. Figure 7D The magnification chromatic aberration curves of the optical imaging device in the macro mode of Embodiments 1, 2 and 3 of this application are shown. Figure 8A This is a schematic diagram of the optical imaging device according to Embodiment 4 of this application when the lens is in telephoto mode; Figure 8B This is a schematic diagram of the optical imaging device according to Embodiment 4 of this application when the lens is in macro mode; Figure 9A This is a schematic diagram of the optical imaging device according to Embodiment 5 of this application when the lens is in telephoto mode; Figure 9B This is a schematic diagram of the optical imaging device according to Embodiment 5 of this application when the lens is in macro mode; Figure 10A This is a schematic diagram of the optical imaging device according to Embodiment Six of this application when the lens is in telephoto mode; Figure 10B This is a schematic diagram of the optical imaging device according to Embodiment Six of this application when the lens is in macro mode; Figure 11A The on-axis chromatic aberration curves of the optical imaging apparatus of Embodiments 4, 5 and 6 of this application are shown when the lens is in telephoto mode; Figure 11B The astigmatism curves of the optical imaging device in the above-described embodiments four, five, and six according to this application are shown when the lens is in a telephoto state; Figure 11C The distortion curves of the optical imaging device in the above-described embodiments four, five, and six according to this application are shown when the lens is in a telephoto state; Figure 11D The magnification chromatic aberration curves of the optical imaging device in the above-described embodiments four, five, and six according to this application are shown when the lens is in telephoto mode; Figure 12A The on-axis chromatic aberration curves of the optical imaging apparatus in the macro mode of Embodiments 4, 5 and 6 of this application are shown. Figure 12B The astigmatism curves of the optical imaging device in the macro mode of Embodiments 4, 5 and 6 of this application are shown. Figure 12C The distortion curves of the optical imaging device in the macro mode of Embodiments 4, 5 and 6 of this application are shown. Figure 12D The magnification chromatic aberration curves of the optical imaging device in the macro mode of Embodiments 4, 5 and 6 of this application are shown. Figure 13A This is a schematic diagram of the structure of the optical imaging device according to Embodiment 7 of this application when the lens is in telephoto mode; Figure 13B This is a schematic diagram of the optical imaging device according to Embodiment 7 of this application when the lens is in macro mode; Figure 14AThis is a schematic diagram of the structure of the optical imaging device according to Embodiment 8 of this application when the lens is in telephoto mode; Figure 14B This is a schematic diagram of the optical imaging device according to Embodiment 8 of this application when the lens is in macro mode; Figure 15A This is a schematic diagram of the optical imaging device according to Embodiment 9 of this application when the lens is in telephoto mode; Figure 15B This is a schematic diagram of the optical imaging device according to Embodiment 9 of this application when the lens is in macro mode; Figure 16A The on-axis chromatic aberration curves of the optical imaging apparatus of Embodiments 7, 8 and 9 of this application are shown when the lens is in telephoto mode. Figure 16B The astigmatism curves of the optical imaging device in the above-described embodiments 7, 8 and 9 according to this application are shown when the lens is in telephoto mode; Figure 16C The distortion curves of the optical imaging device in the above-described embodiments 7, 8 and 9 according to this application are shown when the lens is in telephoto mode; Figure 16D The magnification chromatic aberration curves of the optical imaging apparatus in Embodiments 7, 8 and 9 of this application are shown when the lens is in telephoto mode. Figure 17A The on-axis chromatic aberration curves of the optical imaging apparatus in the macro mode of Embodiments 7, 8 and 9 of this application are shown. Figure 17B The astigmatism curves of the optical imaging device in the macro mode of Embodiments 7, 8 and 9 of this application are shown. Figure 17C The distortion curves of the optical imaging device in the macro mode of Embodiments 7, 8 and 9 of this application are shown. Figure 17D The magnification chromatic aberration curves of the optical imaging apparatus in the macro mode of Embodiments 7, 8 and 9 of this application are shown. Figure 18A The MTF plot of a comparative optical imaging device is shown when R12 / d6s = -5.30; Figure 18B The MTF plot of the optical imaging device of this application is shown when R12 / d6s=-4.66; Figure 18C The MTF plot of a comparative optical imaging device is shown when R12 / d6s = -3.30. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] 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 strictly to scale.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] According to one aspect of this application, such as Figure 1 and Figure 2 As shown, this application provides an optical imaging device, which includes a first optical element group and a second optical element group sequentially from the object side to the image side along the optical axis. The first optical element group is a movable group that can move along the optical axis, and the second optical element group is a fixed group. The first optical element group includes a first lens barrel and a first lens, a second lens, and a third lens assembled within the first lens barrel. The first lens has positive optical power, and the object side of the first lens is convex. The second lens has negative optical power. The third lens has positive optical power. The second optical element group includes a second lens barrel and a fourth lens, a fifth lens, a sixth lens, a sixth spacer element, and a seventh lens assembled within the second lens barrel. The fourth lens has positive optical power. The fifth lens has negative optical power. The sixth lens has positive optical power, and the image side of the sixth lens is convex. The seventh lens has negative optical power, and the image side of the seventh lens is concave. The sixth spacer element is disposed between the sixth lens and the seventh lens and contacts the image side of the sixth lens.

[0028] Specifically, the optical imaging device satisfies: -5.25 < R12 / d6s < -3.40; where R12 is the radius of curvature of the image side of the sixth lens, and d6s is the inner diameter of the object side of the sixth spacer element.

[0029] It is worth noting that the optical power of the seven lenses in the optical imaging device of this application is distributed in a positive-negative-positive-positive-negative-positive-negative-positive pattern, and satisfies the relationship -5.25 < R12 / d6s < -3.40. By constraining the radius of curvature of the image side of the sixth lens and the inner diameter of the object side of the sixth spacer to meet the above ratio, the image side of the sixth lens with a smaller curvature is matched with a spacer with a suitable inner diameter, which blocks excess light and helps to control the light emission angle within a reasonable range, making the light transition smoother. According to the fourth power law of illuminance, this can also ensure a smooth illuminance transition, thereby effectively correcting chromatic aberration within the entire aperture, ensuring image clarity and contrast, and reducing the lens sensitivity of the sixth lens.

[0030] For example, such as Figure 18A The image shows the MTF plot of a comparative optical imaging device when R12 / d6s = -5.30. Figure 18B The image shown is the MTF plot of the optical imaging device of this application when R12 / d6s = -4.66. Figure 18C The figure shows the MTF (Mean Transformation Factor) of a comparative optical imaging device when R12 / d6s = -3.30. Where F1: T Diffuser.Limit represents the theoretical limit curve of diffraction, F1:0F represents the MTF curve at 0 field of view, F2:0.1F represents the MTF curve at 0.1 times the full field of view, F3:0.5F represents the MTF curve at 0.5 times the full field of view, F4:0.7F represents the MTF curve at 0.7 times the full field of view, and F5:1.0F represents the MTF curve at 1.0 times the full field of view. As can be seen from the figure, when the ratio of R12 / d6s exceeds the lower limit of the above relationship, the MTF curve at a spatial frequency of 60 lp / mm shifts to the right, the central field of view shifts by 0.02, and the peak value of the curve decreases. When the ratio of R12 / d6s satisfies the above relationship, the MTF curves converge. When the ratio of R12 / d6s exceeds the upper limit of the above relationship, the MTF curve at a spatial frequency of 60lp / mm shifts to the left, the center field of view shifts by -0.028, and the peak value of the curve decreases.

[0031] Optionally, according to some embodiments of this application, the first optical element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image side of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image side of the second lens. The second lens is made of glass, and the optical imaging device satisfies: 1.25 < EP12 / CT2 < 1.40; where EP12 is the distance between the image side of the first spacer element and the object side of the second spacer element along the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

[0032] In this way, by constraining the ratio of edge thickness to middle thickness of the second lens and limiting the second lens to glass material, it is possible to avoid edge chipping during grinding due to excessively thin edge thickness and clamping breakage due to excessively thin middle thickness, thus ensuring processing yield; balancing optical thermal drift and mechanical thermal deformation, suppressing surface distortion, reducing thermal stress birefringence, and stabilizing optical parameters under high and low temperature environments.

[0033] Optionally, according to some embodiments of this application, the first optical element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image side of the first lens; the optical imaging device satisfies: 1.25 < CT1 / T12 < 1.75; and -3.10 < f2 / d1s < -2.30; wherein, CT1 is the center thickness of the first lens on the optical axis, T12 is the air gap between the first lens and the second lens on the optical axis, f2 is the effective focal length of the second lens, and d1s is the inner diameter of the object side of the first spacer element.

[0034] In this way, by constraining the thickness of the first lens and the air gap between the first and second lenses on the optical axis, the optical path difference between the first and second lenses can be reasonably allocated, reducing wavefront aberrations caused by excessive optical path difference during light transmission. This regulates the angle and position of the light rays exiting from the first lens, allowing the light rays to enter the second lens in a regular posture, avoiding excessive deflection or abnormal incident angles, and ensuring the stability of subsequent optical path transmission. On this basis, by constraining the ratio of the focal length of the second lens to the inner diameter of the object side of the first spacer element within the above range, the divergence angle of the light rays passing through the second lens can be controlled, intercepting unwanted light rays and optimizing the aberration correction capability of the second lens, so as to achieve a large aperture configuration between groups, laying the foundation for achieving the overall design goals and aberration correction.

[0035] Optionally, according to some embodiments of this application, the second optical element group further includes 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; the optical imaging device satisfies: 3.35 < R8 / d4s < 4.25; where R8 is the radius of curvature of the image-side surface of the fourth lens, and d4s is the inner diameter of the object-side surface of the fourth spacer element.

[0036] In this way, the fourth lens is the first lens of the second optical element group. By constraining the ratio of the radius of curvature of the image side of the fourth lens to the inner diameter of the object side of the fourth spacer element, it can be ensured that the light emitted from the first optical element group smoothly enters the second optical element group, reducing the tilt sensitivity of the front and rear optical element groups and avoiding sensitivity caused by the light incident on the second optical element group being too steep.

[0037] Optionally, according to some embodiments of this application, the optical imaging device satisfies: 1.50 < d6s / (D6s-d6s) < 3.45; where d6s is the inner diameter of the object side surface of the sixth spacer element, and D6s is the outer diameter of the object side surface of the sixth spacer element.

[0038] In this way, by controlling the ratio of the inner diameter of the object side of the sixth spacer element to the width of the annular surface of the sixth spacer element, it is possible to ensure that the sixth lens has sufficient structural thickness, guarantee the feasibility of processing and the structural strength of the sixth lens, and also to precisely control the assembly compatibility of the elements, prevent the lens group and lens barrel from being eccentric or tilted after assembly, effectively improve the overall coaxiality of the lens, and thus lay a structural foundation for stable imaging.

[0039] Optionally, according to some embodiments of this application, the second optical element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens; the optical imaging device satisfies: 1.00 < EP56 / T56 < 1.20; wherein, EP56 is the distance between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element along the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

[0040] In this way, by controlling the ratio of the distance between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis to the air gap between the fifth and sixth lenses on the optical axis, it is possible to prevent optical path difference shift and image plane drift caused by abnormal front and rear spacing of the sixth lens, control the axial assembly error of the sixth lens, reduce the risks of eccentricity and tilt between lenses, and ensure optical performance and assembly consistency.

[0041] Optionally, according to some embodiments of this application, the second optical element group further includes 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; the optical imaging device satisfies: 2.20 < D4s / DT42 < 2.70; where D4s is the outer diameter of the object-side surface of the fourth spacer element, and DT42 is the maximum radius of the optically effective portion of the image-side surface of the fourth lens.

[0042] In this way, by controlling the ratio of the outer diameter of the object side of the fourth spacer element to the maximum radius of the optically effective portion of the image side of the fourth lens, the structural thickness of the fourth lens can be guaranteed. This not only improves the processing rigidity of the fourth lens and reduces the risk of chipping and deformation during grinding and assembly, but also ensures the effective width of the positioning support surface of the fourth spacer element, enhances assembly stability, reduces eccentricity and tilting errors, and provides reliable structural protection for the light-transmitting area of ​​the lens.

[0043] Optionally, according to some embodiments of this application, the second optical element group further includes 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; the optical imaging device satisfies: 3.35 < R8 / d4m < 4.45; where R8 is the radius of curvature of the image-side surface of the fourth lens, and d4m is the inner diameter of the image-side surface of the fourth spacer element.

[0044] In this way, by controlling the ratio of the radius of curvature of the image side of the fourth lens to the inner diameter of the image side of the fourth spacer, it is possible to avoid the inner diameter of the fourth spacer being too small, thus preventing the fourth spacer from causing vignetting or occlusion of the edge light rays of the large-curvature fourth lens, ensuring light transmission efficiency and imaging uniformity. It also prevents the curvature of the fourth lens from being too large and the size of the fourth spacer from being mismatched, which would cause interference between the edge of the fourth lens and the fourth spacer. At the same time, it optimizes the surface contact area of ​​the assembly and positioning, improves installation stability, avoids eccentricity and tilting errors, and lays a solid foundation for subsequent optical path transmission and overall image quality control.

[0045] Optionally, according to some embodiments of this application, the first optical element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image side of the second lens; the optical imaging device satisfies: 2.15 < d2s / TH2 < 2.80; where d2s is the inner diameter of the object side of the second spacer element, and TH2 is the width of the non-effective diameter of the second lens parallel to the optical axis.

[0046] In this way, by controlling the ratio of the inner diameter of the object side of the second spacer element to the width of the non-effective diameter of the second lens parallel to the optical axis, the ratio of the effective light-transmitting aperture of the second lens to the edge mechanical thickness, i.e., the diameter-to-thickness ratio of the glass lens, can be controlled. By constraining this value, it is possible to avoid edge chipping and clamping breakage caused by excessively thin edges, reduce the impact of thermal deformation on the optical surface shape, and improve the lens processing yield and structural stability across the entire temperature range.

[0047] Optionally, according to some embodiments of this application, the second optical element group further includes 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; the optical imaging device satisfies: 0.90 < CT4 / EPb4 < 1.25; wherein, CT4 is the center thickness of the fourth lens on the optical axis, and EPb4 is the distance along the optical axis from the object side end face of the second lens barrel to the object side surface of the fourth spacer element.

[0048] In this way, by constraining the ratio of the center thickness of the fourth lens on the optical axis to the distance between the object-side end face of the second lens barrel and the object-side surface of the fourth spacer element along the optical axis, the axial layout is optimized by utilizing the convex shape of the object-side surface of the fourth lens. Without sacrificing optical power and aberration correction capabilities, the overall length of the system can be compressed, achieving a compact optical path arrangement, improving the uniformity of imaging across the entire field of view, and providing size control assurance for lens miniaturization and ultra-thin design.

[0049] Optionally, according to some embodiments of this application, the first optical element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image side of the first lens; the optical imaging device satisfies: 4.60 < f1 / d1s < 15.35; where f1 is the effective focal length of the first lens and d1s is the inner diameter of the object side of the first spacer element.

[0050] In this way, by constraining the ratio of the effective focal length of the first lens to the inner diameter of the object side of the first spacer element, light convergence can be efficiently completed, providing incident conditions for subsequent optical paths, avoiding excessive refraction of edge light due to excessive focal length, which easily produces aberrations, or insufficient light transmission inner diameter causing effective light to be blocked and image vignetting.

[0051] Optionally, according to some embodiments of this application, the second optical element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, and a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens; the fifth lens is made of plastic, and the optical imaging device satisfies: 1.45 < EP45 / CT5 < 1.90; wherein, EP45 is the distance between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

[0052] In this way, the fifth lens is made of plastic. By constraining the ratio of the distance between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis to the center thickness of the fifth lens on the optical axis, it is possible to adapt to the characteristics of plastic material, which has a high coefficient of thermal expansion and is easily deformed. This can avoid insufficient optical power and thermal drift sensitivity caused by the center of the fifth lens being too thin, and also prevent injection molding defects caused by the edge thickness of the fifth lens being too small. At the same time, it can also reasonably allocate axial space, avoid interference with the front and rear lenses or spacers, reduce surface shape errors caused by injection molding shrinkage and temperature warping, and ensure imaging consistency and lens assembly yield across the entire temperature range.

[0053] Optionally, according to some embodiments of this application, the optical imaging device satisfies: -11.95 < R12 / T67 < -8.05; where R12 is the radius of curvature of the image-side surface of the sixth lens, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

[0054] In this way, by constraining the ratio of the radius of curvature of the image side of the sixth lens to the air gap between the sixth and seventh lenses on the optical axis, the deflection angle of the outgoing light from the sixth lens can be controlled, avoiding excessive deflection of light due to an overly steep surface or optical path congestion caused by improper spacing, providing a smooth incident angle for the seventh lens, and improving the stability and assembly reliability of the overall optical system.

[0055] Optionally, according to some embodiments of this application, the optical imaging device satisfies: 2.25 < R13 / f7 < 6.40; where R13 is the radius of curvature of the object side surface of the seventh lens, and f7 is the effective focal length of the seventh lens.

[0056] In this way, the seventh lens is the lens closest to the imaging plane. By controlling the ratio of the radius of curvature of the object side of the seventh lens to the effective focal length of the seventh lens, light rays of different fields of view and different wavelengths passing through the seventh lens can be guided to enter the image plane in a more uniform and more perpendicular manner, suppressing vignetting and response unevenness caused by oblique incidence, providing a regular optical path for the imaging plane, and ensuring the clarity and uniformity of the full field of view imaging.

[0057] Optionally, according to some embodiments of this application, the width of the non-effective diameter of the second lens parallel to the optical axis is greater than the width of the non-effective diameter of the other lenses parallel to the optical axis.

[0058] In this way, the second lens is a spherical glass material. The second lens has a wider effective diameter, which can provide a larger mounting surface, improve positioning stability, reduce lens wobble and motor load during focusing, and can serve as the main support reference for the first optical element group. While ensuring optical power and aberration correction capabilities, it reduces the number of non-optical parts, reduces tolerance accumulation, improves mechanical rigidity, effectively compresses axial dimensions, and helps with miniaturization.

[0059] 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, the optical imaging lens may also include a number of spacers other than those described in the above embodiments, as needed.

[0060] The following is a reference to the appendix. Figure 2The following describes some specific, non-limiting embodiments of the above-described embodiments of this application in more detail. For ease of description, in the following embodiments, OBJ represents the object plane of the optical imaging device, STO represents the surface of the aperture stop, 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, E14 represents the image-side plane of the seventh lens E7, S15 represents the object-side plane of the filter E8, S16 represents the image-side plane of the filter E8, and S17 represents the image plane IMA.

[0061] Example 1 like Figure 3A and Figure 3B As shown, in this embodiment, the optical imaging device includes a first optical element group and a second optical element group in sequence from the object side to the image side along the optical axis. The first optical element group is a movable group that can move along the optical axis, and the second optical element group is a fixed group.

[0062] The first optical element group includes a first lens barrel Pa and a first lens E1, a second lens E2, and a third lens E3 assembled within the first lens barrel Pa; the first lens E1 has positive optical power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex and concave, respectively; the second lens E2 has negative optical power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are both concave; the third lens E3 has positive optical power, and the object-side surface S5 and the image-side surface S6 of the third lens E3 are both convex.

[0063] The first optical element group further 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, and 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.

[0064] The second optical element includes a second lens barrel Pb and a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 assembled within the second lens barrel Pb; the fourth lens E4 has positive optical power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are convex and concave, respectively; the fifth lens E5 has negative optical power, and the object-side surface S9 and the image-side surface S10 of the fifth lens E5 are convex and concave, respectively; the sixth lens E6 has positive optical power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are both convex; the seventh lens E7 has negative optical power, and the object-side surface S13 and the image-side surface S14 of the seventh lens E7 are both concave.

[0065] The second optical element group further includes 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.

[0066] 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).

[0067] Table 1

[0068] Table 2 shows the optical parameters of the optical imaging device in both telephoto and macro lens states of Embodiment 1. The units for focal length f, air gap D1 between the object plane OBJ and the object side of the first lens E1 on the optical axis, and air gap D2 between the image side of the third lens E3 and the object side of the fourth lens E4 on the optical axis are all millimeters (mm).

[0069] Table 2

[0070] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 and the third lens E3 to the seventh lens E7 are aspherical. The second lens E2 is made of glass, and its object-side surface and image-side surface are spherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula: ; 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. Tables 3-1 and 3-2 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, and A24 that can be used for the aspherical mirrors S1, S2, and S5 to S14 in Example 1.

[0071] Table 3-1

[0072] Table 3-2

[0073] Example 2 like Figure 4A and Figure 4B As shown, in this embodiment, the optical imaging device includes a first optical element group and a second optical element group in sequence from the object side to the image side along the optical axis. The first optical element group is a movable group that can move along the optical axis, and the second optical element group is a fixed group.

[0074] The first optical element group includes a first lens barrel Pa and a first lens E1, a second lens E2, and a third lens E3 assembled within the first lens barrel Pa; the first lens E1 has positive optical power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex and concave, respectively; the second lens E2 has negative optical power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are both concave; the third lens E3 has positive optical power, and the object-side surface S5 and the image-side surface S6 of the third lens E3 are both convex.

[0075] The first optical element group further 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, and 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.

[0076] The second optical element includes a second lens barrel Pb and a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 assembled within the second lens barrel Pb; the fourth lens E4 has positive optical power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are convex and concave, respectively; the fifth lens E5 has negative optical power, and the object-side surface S9 and the image-side surface S10 of the fifth lens E5 are convex and concave, respectively; the sixth lens E6 has positive optical power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are both convex; the seventh lens E7 has negative optical power, and the object-side surface S13 and the image-side surface S14 of the seventh lens E7 are both concave.

[0077] The second optical element group further includes 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.

[0078] 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, the optical parameter tables for both telephoto and macro lens states are the same as Table 2, and the aspherical coefficient table is the same as Tables 3-1 and 3-2. However, the optical imaging device of Embodiment 2 has different structural parameters than the optical imaging device of Embodiment 1 above. That is, the difference between Embodiment 2 and Embodiment 1 is that the dimensional values ​​of some structural parameters of the lens barrel and multiple spacer elements in the optical imaging device are different.

[0079] Example 3 like Figure 5A and Figure 5B As shown, in this embodiment, the optical imaging device includes a first optical element group and a second optical element group in sequence from the object side to the image side along the optical axis. The first optical element group is a movable group that can move along the optical axis, and the second optical element group is a fixed group.

[0080] The first optical element group includes a first lens barrel Pa and a first lens E1, a second lens E2, and a third lens E3 assembled within the first lens barrel Pa; the first lens E1 has positive optical power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex and concave, respectively; the second lens E2 has negative optical power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are both concave; the third lens E3 has positive optical power, and the object-side surface S5 and the image-side surface S6 of the third lens E3 are both convex.

[0081] The first optical element group further 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, and 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.

[0082] The second optical element includes a second lens barrel Pb and a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 assembled within the second lens barrel Pb; the fourth lens E4 has positive optical power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are convex and concave, respectively; the fifth lens E5 has negative optical power, and the object-side surface S9 and the image-side surface S10 of the fifth lens E5 are convex and concave, respectively; the sixth lens E6 has positive optical power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are both convex; the seventh lens E7 has negative optical power, and the object-side surface S13 and the image-side surface S14 of the seventh lens E7 are both concave.

[0083] The second optical element group further includes 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.

[0084] 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, the optical parameter tables for both telephoto and macro lens states are the same as Table 2, and the aspherical coefficient table is the same as Tables 3-1 and 3-2. However, the optical imaging device of Embodiment 3 has different structural parameters than the optical imaging device of Embodiment 1 above. That is, the difference between Embodiment 3 and Embodiment 1 is that the dimensional values ​​of some structural parameters of the lens barrel and multiple spacer elements in the optical imaging device are different.

[0085] The on-axis chromatic aberration curves of the optical imaging devices in Embodiments 1, 2, and 3 when the lens is in telephoto mode are as follows: Figure 6A 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 device in Embodiments 1, 2, and 3 when the lens is in telephoto mode are shown in the figure. Figure 6BAs 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 when the lens is in telephoto mode are shown below. Figure 6C As shown, it represents the degree of geometric distortion of imaging at different field-of-view positions; the magnification chromatic aberration curves of the optical imaging devices in Embodiments 1, 2, and 3 when the lens is in telephoto mode are shown in the figure. Figure 6D As shown, it represents the degree of chromatic aberration shift of different colors of light at different field-of-view positions. The on-axis chromatic aberration curves of the optical imaging devices in Embodiments 1, 2, and 3 when the lens is in macro mode are shown below. Figure 7A 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 device in the macro mode in Embodiments 1, 2, and 3 are shown below. Figure 7B 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 when the lens is in macro mode are shown in the figure. Figure 7C As shown, it represents the degree of geometric distortion of imaging at different field-of-view positions; the magnification chromatic aberration curves of the optical imaging devices in Embodiments 1, 2, and 3 when the lens is in macro mode are shown in the figure. Figure 7D As shown, it represents the degree of chromatic aberration shift along the vertical axis for different colors of light at different viewing positions. According to... Figures 6A to 7D It can be seen that the optical imaging devices in Embodiment 1, Embodiment 2 and Embodiment 3 can all achieve good imaging quality.

[0086] Example 4 like Figure 8A and Figure 8B As shown, in this embodiment, the optical imaging device includes a first optical element group and a second optical element group in sequence from the object side to the image side along the optical axis. The first optical element group is a movable group that can move along the optical axis, and the second optical element group is a fixed group.

[0087] The first optical element group includes a first lens barrel Pa and a first lens E1, a second lens E2, and a third lens E3 assembled within the first lens barrel Pa; the first lens E1 has positive optical power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex and concave, respectively; the second lens E2 has negative optical power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are concave and convex, respectively; the third lens E3 has positive optical power, and the object-side surface S5 and the image-side surface S6 of the third lens E3 are both convex.

[0088] The first optical element group further 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, and 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.

[0089] The second optical element includes a second lens barrel Pb and a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 assembled within the second lens barrel Pb; the fourth lens E4 has positive optical power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are convex and concave, respectively; the fifth lens E5 has negative optical power, and the object-side surface S9 and the image-side surface S10 of the fifth lens E5 are convex and concave, respectively; the sixth lens E6 has positive optical power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are both convex; the seventh lens E7 has negative optical power, and the object-side surface S13 and the image-side surface S14 of the seventh lens E7 are both concave.

[0090] The second optical element group further includes 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.

[0091] In addition, Table 4 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).

[0092] Table 4

[0093] Table 5 shows the optical parameters of the optical imaging device of Embodiment 4 in both telephoto and macro lens states. The units for focal length f, air gap D1 between the object plane OBJ and the object side of the first lens E1 on the optical axis, and air gap D2 between the image side of the third lens E3 and the object side of the fourth lens E4 on the optical axis are all millimeters (mm).

[0094] Table 5

[0095] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 and the third lens E3 to the seventh lens E7 are aspherical. The second lens E2 is made of glass, and its object-side surface and image-side surface are spherical. The surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Tables 6-1 and 6-2 below give 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, S2, and S5 to S14 in Embodiment 4.

[0096] Table 6-1

[0097] Table 6-2

[0098] Example 5 like Figure 9A and Figure 9B As shown, in this embodiment, the optical imaging device includes a first optical element group and a second optical element group in sequence from the object side to the image side along the optical axis. The first optical element group is a movable group that can move along the optical axis, and the second optical element group is a fixed group.

[0099] The first optical element group includes a first lens barrel Pa and a first lens E1, a second lens E2, and a third lens E3 assembled within the first lens barrel Pa; the first lens E1 has positive optical power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex and concave, respectively; the second lens E2 has negative optical power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are concave and convex, respectively; the third lens E3 has positive optical power, and the object-side surface S5 and the image-side surface S6 of the third lens E3 are both convex.

[0100] The first optical element group further 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, and 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.

[0101] The second optical element includes a second lens barrel Pb and a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 assembled within the second lens barrel Pb; the fourth lens E4 has positive optical power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are convex and concave, respectively; the fifth lens E5 has negative optical power, and the object-side surface S9 and the image-side surface S10 of the fifth lens E5 are convex and concave, respectively; the sixth lens E6 has positive optical power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are both convex; the seventh lens E7 has negative optical power, and the object-side surface S13 and the image-side surface S14 of the seventh lens E7 are both concave.

[0102] The second optical element group further includes 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.

[0103] 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 4, the optical parameter tables for both telephoto and macro lens states are the same as Table 5, and the aspherical coefficient table is the same as Tables 6-1 and 6-2. However, the optical imaging device of Embodiment 5 has different structural parameters than the optical imaging device of Embodiment 4 above. That is, the difference between Embodiment 5 and Embodiment 4 above lies in the fact that the dimensional values ​​of some structural parameters of the lens barrel and multiple spacer elements in the optical imaging device are different.

[0104] Example 6 like Figure 10A and Figure 10B As shown, in this embodiment, the optical imaging device includes a first optical element group and a second optical element group in sequence from the object side to the image side along the optical axis. The first optical element group is a movable group that can move along the optical axis, and the second optical element group is a fixed group.

[0105] The first optical element group includes a first lens barrel Pa and a first lens E1, a second lens E2, and a third lens E3 assembled within the first lens barrel Pa; the first lens E1 has positive optical power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex and concave, respectively; the second lens E2 has negative optical power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are concave and convex, respectively; the third lens E3 has positive optical power, and the object-side surface S5 and the image-side surface S6 of the third lens E3 are both convex.

[0106] The first optical element group further 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, and 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.

[0107] The second optical element includes a second lens barrel Pb and a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 assembled within the second lens barrel Pb; the fourth lens E4 has positive optical power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are convex and concave, respectively; the fifth lens E5 has negative optical power, and the object-side surface S9 and the image-side surface S10 of the fifth lens E5 are convex and concave, respectively; the sixth lens E6 has positive optical power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are both convex; the seventh lens E7 has negative optical power, and the object-side surface S13 and the image-side surface S14 of the seventh lens E7 are both concave.

[0108] The second optical element group further includes 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.

[0109] 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 4, the optical parameter tables for both telephoto and macro lens states are the same as Table 5, and the aspherical coefficient table is the same as Tables 6-1 and 6-2. However, the optical imaging device of Embodiment 6 has different structural parameters from the optical imaging device of Embodiment 4 above. That is, the difference between Embodiment 6 and Embodiment 4 is that the dimensional values ​​of some structural parameters of the lens barrel and multiple spacer elements in the optical imaging device are different.

[0110] The on-axis chromatic aberration curves of the optical imaging devices in Examples 4, 5, and 6 when the lens is in telephoto mode are as follows: Figure 11A 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 device in Embodiments 4, 5, and 6 when the lens is in telephoto mode are shown in the figure. Figure 11B 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 device in Embodiments 4, 5, and 6 when the lens is in telephoto mode are shown below. Figure 11C As shown, it represents the degree of geometric distortion of imaging at different field-of-view positions; the magnification chromatic aberration curves of the optical imaging devices in Embodiments 4, 5, and 6 when the lens is in telephoto mode are shown in the figure. Figure 11D As shown, it represents the degree of chromatic aberration shift of different colors of light at different field-of-view positions. The on-axis chromatic aberration curves of the optical imaging devices in Embodiments 4, 5, and 6 when the lens is in macro mode are shown below. Figure 12A 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 device in Embodiments 4, 5, and 6 when the lens is in macro mode are shown in the figure. Figure 12B 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 when the lens is in macro mode are shown in the figure. Figure 12C As shown, it represents the degree of geometric distortion of imaging at different field-of-view positions; the magnification chromatic aberration curves of the optical imaging devices in Embodiments 4, 5, and 6 when the lens is in macro mode are shown in the figure. Figure 12D As shown, it represents the degree of chromatic aberration shift along the vertical axis for different colors of light at different viewing positions. According to... Figures 11A to 12D It can be seen that the optical imaging devices in Embodiments 4, 5 and 6 can all achieve good imaging quality.

[0111] Example 7 like Figure 13A and Figure 13B As shown, in this embodiment, the optical imaging device includes a first optical element group and a second optical element group in sequence from the object side to the image side along the optical axis. The first optical element group is a movable group that can move along the optical axis, and the second optical element group is a fixed group.

[0112] The first optical element group includes a first lens barrel Pa and a first lens E1, a second lens E2, and a third lens E3 assembled within the first lens barrel Pa; the first lens E1 has positive optical power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex and concave, respectively; the second lens E2 has negative optical power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are concave and convex, respectively; the third lens E3 has positive optical power, and the object-side surface S5 and the image-side surface S6 of the third lens E3 are both convex.

[0113] The first optical element group further 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, and 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.

[0114] The second optical element includes a second lens barrel Pb and a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 assembled within the second lens barrel Pb; the fourth lens E4 has positive optical power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are convex and concave, respectively; the fifth lens E5 has negative optical power, and the object-side surface S9 and the image-side surface S10 of the fifth lens E5 are convex and concave, respectively; the sixth lens E6 has positive optical power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are both convex; the seventh lens E7 has negative optical power, and the object-side surface S13 and the image-side surface S14 of the seventh lens E7 are both concave.

[0115] The second optical element group further includes 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.

[0116] In addition, Table 7 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).

[0117] Table 7

[0118] Table 8 shows the optical parameters of the optical imaging device of Embodiment 7 in both telephoto and macro lens states. The units for focal length f, air gap D1 between the object plane OBJ and the object side of the first lens E1 on the optical axis, and air gap D2 between the image side of the third lens E3 and the object side of the fourth lens E4 on the optical axis are all millimeters (mm).

[0119] Table 8

[0120] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 and the third lens E3 to the seventh lens E7 are aspherical. The second lens E2 is made of glass, and its object-side surface and image-side surface are spherical. The surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Tables 9-1 and 9-2 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, and A28 that can be used for each aspherical mirror S1, S2, and S5 to S14 in Embodiment 7.

[0121] Table 9-1

[0122] Table 9-2

[0123] Example 8 like Figure 14A and Figure 14B As shown, in this embodiment, the optical imaging device includes a first optical element group and a second optical element group in sequence from the object side to the image side along the optical axis. The first optical element group is a movable group that can move along the optical axis, and the second optical element group is a fixed group.

[0124] The first optical element group includes a first lens barrel Pa and a first lens E1, a second lens E2, and a third lens E3 assembled within the first lens barrel Pa; the first lens E1 has positive optical power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex and concave, respectively; the second lens E2 has negative optical power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are concave and convex, respectively; the third lens E3 has positive optical power, and the object-side surface S5 and the image-side surface S6 of the third lens E3 are both convex.

[0125] The first optical element group further 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, and 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.

[0126] The second optical element includes a second lens barrel Pb and a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 assembled within the second lens barrel Pb; the fourth lens E4 has positive optical power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are convex and concave, respectively; the fifth lens E5 has negative optical power, and the object-side surface S9 and the image-side surface S10 of the fifth lens E5 are convex and concave, respectively; the sixth lens E6 has positive optical power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are both convex; the seventh lens E7 has negative optical power, and the object-side surface S13 and the image-side surface S14 of the seventh lens E7 are both concave.

[0127] The second optical element group further includes 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] It is worth noting that, compared with Embodiment 7 above, the optical imaging device of Embodiment 8 has the same optical parameters. That is, the basic optical parameter table of the optical imaging device of Embodiment 8 is the same as Table 7, the optical parameter tables for both telephoto and macro lens states are the same as Table 8, and the aspherical coefficient table is the same as Tables 9-1 and 9-2. However, the optical imaging device of Embodiment 8 has different structural parameters than the optical imaging device of Embodiment 7 above. That is, the difference between Embodiment 8 and Embodiment 7 is that the dimensional values ​​of some structural parameters of the lens barrel and multiple spacer elements in the optical imaging device are different.

[0129] Example 9 like Figure 15A and Figure 15B As shown, in this embodiment, the optical imaging device includes a first optical element group and a second optical element group in sequence from the object side to the image side along the optical axis. The first optical element group is a movable group that can move along the optical axis, and the second optical element group is a fixed group.

[0130] The first optical element group includes a first lens barrel Pa and a first lens E1, a second lens E2, and a third lens E3 assembled within the first lens barrel Pa; the first lens E1 has positive optical power, and the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex and concave, respectively; the second lens E2 has negative optical power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are concave and convex, respectively; the third lens E3 has positive optical power, and the object-side surface S5 and the image-side surface S6 of the third lens E3 are both convex.

[0131] The first optical element group further 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, and 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.

[0132] The second optical element includes a second lens barrel Pb and a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 assembled within the second lens barrel Pb; the fourth lens E4 has positive optical power, and the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are convex and concave, respectively; the fifth lens E5 has negative optical power, and the object-side surface S9 and the image-side surface S10 of the fifth lens E5 are convex and concave, respectively; the sixth lens E6 has positive optical power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are both convex; the seventh lens E7 has negative optical power, and the object-side surface S13 and the image-side surface S14 of the seventh lens E7 are both concave.

[0133] The second optical element group further includes 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.

[0134] 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 7, the optical parameter tables for telephoto and macro lens states are the same as Table 8, and the aspherical coefficient table is the same as Tables 9-1 and 9-2. However, the optical imaging device of Embodiment 9 has different structural parameters than the optical imaging device of Embodiment 7 above. That is, the difference between Embodiment 9 and Embodiment 7 is that the dimensional values ​​of some structural parameters of the lens barrel and multiple spacer elements in the optical imaging device are different.

[0135] The on-axis chromatic aberration curves of the optical imaging devices in Examples 7, 8, and 9 when the lens is in telephoto mode are as follows: Figure 16A 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 device in Embodiments 7, 8, and 9 when the lens is in telephoto mode are shown in the figure. Figure 16B 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 when the lens is in telephoto mode are shown below. Figure 16C As shown, it represents the degree of geometric distortion of imaging at different field-of-view positions; the magnification chromatic aberration curves of the optical imaging devices in Embodiments 7, 8, and 9 when the lens is in telephoto mode are shown in the figure. Figure 16D As shown, it represents the degree of chromatic aberration shift of different colors of light at different field-of-view positions. The on-axis chromatic aberration curves of the optical imaging devices in Embodiments 7, 8, and 9 when the lens is in macro mode are shown below. Figure 17A 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 device in Embodiments 7, 8, and 9 when the lens is in macro mode are shown in the figure. Figure 17B 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 when the lens is in macro mode are shown in the figure. Figure 17C As shown, it represents the degree of geometric distortion of imaging at different field-of-view positions; the magnification chromatic aberration curves of the optical imaging devices in Embodiments 7, 8, and 9 when the lens is in macro mode are shown in the figure. Figure 17D As shown, it represents the degree of chromatic aberration shift along the vertical axis for different colors of light at different viewing positions. According to... Figures 16A to 17D It can be seen that the optical imaging devices in Embodiments 7, 8 and 9 can all achieve good imaging quality.

[0136] In summary, in Embodiments 1 to 9, the effective focal lengths f1 to f7 of the first lens E1 to the seventh lens E7 in the optical imaging device, and the maximum radius DT42 of the optically effective portion of the image-side surface of the fourth lens are shown in Table 10 below. All parameters are in mm.

[0137] Table 10

[0138] Furthermore, the structural parameters of the optical imaging devices in Examples 1 to 9 are shown in Table 11, and the unit of each structural parameter is millimeters (mm).

[0139] Table 11

[0140] Wherein, d1s is the inner diameter of the object side of the first spacer element, d2s is the inner diameter of the object side of the second spacer element, TH2 is the width of the non-effective diameter of the second lens parallel to the optical axis, d4s is the inner diameter d4m of the object side of the fourth spacer element, D4s is the outer diameter of the object side of the fourth spacer element, d5s is the inner diameter of the object side of the fifth spacer element, D5s is the outer diameter of the object side of the fifth spacer element, d6s is the inner diameter of the object side of the sixth spacer element, D6s is the outer diameter of the object side of the sixth spacer element, EP12 is the spacing distance along the optical axis from the image side of the first spacer element to the object side of the second spacer element, EPb4 is the spacing distance along the optical axis from the object side end face of the second lens barrel to the object side of the fourth spacer element, EP45 is the spacing distance along the optical axis from the image side of the fourth spacer element to the object side of the fifth spacer element, CT5 is the center thickness of the fifth lens on the optical axis, and EP56 is the spacing distance along the optical axis from the image side of the fifth spacer element to the object side of the sixth spacer element.

[0141] In summary, the optical imaging devices in Embodiments 1 to 9 satisfy the relationships shown in Table 12, as detailed in Table 12.

[0142] Table 12

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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, Along the optical axis from the object side to the image side, it includes a first optical element group and a second optical element group in sequence. The first optical element group is a movable group that can move along the optical axis, and the second optical element group is a fixed group. The first optical element group includes a first lens barrel and a first lens, a second lens, and a third lens assembled within the first lens barrel; the first lens has positive optical power, and the object side of the first lens is convex; the second lens has negative optical power; and the third lens has positive optical power. The second optical element includes a second lens barrel and a fourth lens, a fifth lens, a sixth lens, a sixth spacer element, and a seventh lens assembled within the second lens barrel; the fourth lens has positive optical power; the fifth lens has negative optical power; the sixth lens has positive optical power, and its image-side surface is convex; the seventh lens has negative optical power, and its image-side surface is concave; the sixth spacer element is disposed between the sixth lens and the seventh lens and contacts the image-side surface of the sixth lens; the optical imaging device satisfies: -5.25 < R12 / d6s < -3.40; Wherein, R12 is the radius of curvature of the image side of the sixth lens, and d6s is the inner diameter of the object side of the sixth spacer element.

2. The optical imaging device according to claim 1, characterized in that, The first optical element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens, and 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. The second lens is made of glass. The optical imaging device satisfies the following: 1.25 < EP12 / CT2 < 1.40; Wherein, EP12 is the distance between the image side of the first spacer element and the object side of the second spacer element along the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

3. The optical imaging device according to claim 1, characterized in that, The first optical element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens; the optical imaging device satisfies: 1.25 < CT1 / T12 < 1.75; and -3.10 < f2 / d1s < -2.30; Wherein, CT1 is the center thickness of the first lens on the optical axis, T12 is the air gap between the first lens and the second lens on the optical axis, f2 is the effective focal length of the second 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 second optical element group further includes 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; the optical imaging device satisfies: 3.35 < R8 / d4s < 4.25; Wherein, R8 is the radius of curvature of the image side of the fourth lens, and d4s is the inner diameter of the object side of the fourth spacer element.

5. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 1.50<d6s / (D6s-d6s)<3.45; Wherein, d6s is the inner diameter of the object side of the sixth spacer element, and D6s is the outer diameter of the object side of the sixth spacer element.

6. The optical imaging device according to claim 1, characterized in that, The second optical element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens; the optical imaging device satisfies: 1.00 < EP56 / T56 < 1.20; Wherein, EP56 is the distance between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

7. The optical imaging device according to claim 1, characterized in that, The second optical element group further includes 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; the optical imaging device satisfies: 2.20 < D4s / DT42 < 2.70; Wherein, D4s is the outer diameter of the object side of the fourth spacer element, and DT42 is the maximum radius of the optically effective portion of the image side of the fourth lens.

8. The optical imaging device according to claim 1, characterized in that, The second optical element group further includes 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; the optical imaging device satisfies: 3.35 < R8 / d4m < 4.45; Wherein, R8 is the radius of curvature of the image-side surface of the fourth lens, and d4m is the inner diameter of the image-side surface of the fourth spacer element.

9. The optical imaging device according to claim 1, characterized in that, The first optical element group further includes 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; the optical imaging device satisfies: 2.15 < d²s / TH² < 2.80; Wherein, d2s is the inner diameter of the object side of the second spacer element, and TH2 is the width of the non-effective diameter of the second lens parallel to the optical axis.

10. The optical imaging device according to claim 1, characterized in that, The second optical element group further includes 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; the optical imaging device satisfies: 0.90 < CT4 / EPb4 < 1.25; Wherein, CT4 is the center thickness of the fourth lens on the optical axis, and EPb4 is the distance along the optical axis from the object-side end face of the second lens barrel to the object-side surface of the fourth spacer element.

11. The optical imaging device according to claim 1, characterized in that, The first optical element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens; the optical imaging device satisfies: 4.60 < f1 / d1s < 15.35; Where f1 is the effective focal length of the first lens, and d1s is the inner diameter of the object side surface of the first spacer element.

12. The optical imaging device according to claim 1, characterized in that, The second optical element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, and a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens; the fifth lens is made of plastic, and the optical imaging device satisfies: 1.45 < EP45 / CT5 < 1.90; Wherein, EP45 is the distance between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

13. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: -11.95 < R12 / T67 < -8.05; Wherein, R12 is the radius of curvature of the image side of the sixth lens, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

14. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 2.25 < R13 / f7 < 6.40; Wherein, R13 is the radius of curvature of the object side surface of the seventh lens, and f7 is the effective focal length of the seventh lens.

15. The optical imaging device according to claim 1, characterized in that, The width of the non-effective diameter of the second lens parallel to the optical axis is greater than the width of the non-effective diameter of the other lenses parallel to the optical axis.

Images