Optical imaging device

Abstract

The application provides an optical imaging device, comprising a lens barrel, a lens group and a plurality of spacer elements accommodated in the lens barrel; the lens barrel has an object side end surface, an image side end surface, an outer annular surface and an inner annular surface; the lens group comprises, arranged in order from the object side to the image side along the optical axis: a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power, a sixth lens with negative refractive power, and a seventh lens with negative refractive power; the optical imaging device satisfies: 0.9≤tan(Semi-FOV) / fno<1; 0

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 optical imaging equipment technology, optical imaging devices are widely used in electronic devices such as smart glasses and mobile terminals. Users have increasingly higher requirements for the imaging quality of optical imaging devices, especially seven-element optical imaging devices. To meet these high imaging quality requirements, the design of optical imaging devices faces numerous challenges. In some wide-angle lenses, due to the large half-field of view, if the lens refractive force is unevenly distributed during the design, it can easily lead to asymmetrical attenuation of the MTF in the meridional and sagittal directions, resulting in high-frequency MTF collapse. Summary of the Invention

[0003] One advantage of this application is that it provides an optical imaging device that can solve the problem of high-frequency MTF collapse in wide-angle lenses.

[0004] This application provides an optical imaging device, including a lens barrel and a lens group and a plurality of spacers housed within the lens barrel; the lens barrel has an object-side end face, an image-side end face, an outer annular surface, and an inner annular surface; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with negative optical power; the plurality of spacers include those positioned between the first lens and the second lens and adjacent to the first lens. A first spacer element that contacts the image side of the lens; a second spacer element that is placed between the second lens and the third lens and contacts the image side of the second lens; a third spacer element that is placed between the third lens and the fourth lens and contacts the image side of the third lens; a fourth spacer element that is placed between the fourth lens and the fifth lens and contacts the image side of the fourth lens; a fifth spacer element that is placed between the fifth lens and the sixth lens and contacts the image side of the fifth lens; and a sixth spacer element that is placed between the sixth lens and the seventh lens and contacts the image side of the sixth lens.

[0005] The optical imaging device satisfies: 0.9 ≤ tan(Semi-FOV) / fno < 1; 0 < f1 / f7 < 0.30; and 1.65 < (R1-R2) / d0s < 2.25; where Semi-FOV is half of the maximum field of view of the optical imaging device, fno is the aperture coefficient of the optical imaging device, f1 is the effective focal length of the first lens, f7 is the effective focal length of the seventh lens, d0s is the inner diameter of the object-side end face of the lens barrel, R1 is the radius of curvature of the object-side surface of the first lens, and R2 is the radius of curvature of the image-side surface of the first lens.

[0006] In one embodiment of this application, the optical imaging device satisfies: 0.75 < EP12 / (CT1+CT2) < 0.95; where EP12 is the axial distance from the image side of the first spacer element to the object side of the second spacer element, CT1 is the center thickness of the first lens, and CT2 is the center thickness of the second lens.

[0007] In one embodiment of this application, the optical imaging device satisfies: 0.05 < (EP12 - EP23) / (f2 - f3) < 1.20; where EP12 is the axial distance from the image side of the first spacer element to the object side of the second spacer element, EP23 is the axial distance from the image side of the second spacer element to the object side of the third spacer element, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens.

[0008] In one embodiment of this application, the optical imaging device satisfies: 0 < (d3s - d2m) / CT3 < 0.25; where d2m is the image-side inner diameter of the second spacer element, d3s is the object-side inner diameter of the third spacer element, and CT3 is the center thickness of the third lens.

[0009] In one embodiment of this application, the optical imaging device satisfies: 2.55 < (CT3 + CT5) / CT4 ≤ 3.90; where CT3 is the center thickness of the third lens, CT4 is the center thickness of the fourth lens, and CT5 is the center thickness of the fifth lens.

[0010] In one embodiment of this application, the optical imaging device satisfies: -2.05 < (R7 + R8) / f4 ≤ 9.20; where f4 is the effective focal length of the fourth lens, R7 is the radius of curvature of the object side of the fourth lens, and R8 is the radius of curvature of the image side of the fourth lens.

[0011] In one embodiment of this application, the optical imaging device satisfies: 1.05 ≤ < EP34 / CT4 < 1.85; where EP34 is the axial distance from the image side of the third spacer element to the object side of the fourth spacer element, and CT4 is the center thickness of the fourth lens.

[0012] In one embodiment of this application, the optical imaging device satisfies: -0.05≤(EP45-CT5) / f5<0.50; where EP45 is the axial distance 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, and f5 is the effective focal length of the fifth lens.

[0013] In one embodiment of this application, the optical imaging device satisfies: 2.80 < EP56 / CT6 ≤ 3.85; where EP56 is the axial distance from the image side of the fifth spacer element to the object side of the sixth spacer element, and CT6 is the center thickness of the sixth lens.

[0014] In one embodiment of this application, when the optical imaging device satisfies: 2.80 < EP56 / CT6 < 3.75, the plurality of spacers include a sixth auxiliary spacer element placed on the image side of the sixth spacer element and in contact with the image side side of the sixth spacer element, wherein EP56 is the axial distance from the image side side of the fifth spacer element to the object side side of the sixth spacer element, and CT6 is the center thickness of the sixth lens.

[0015] In one embodiment of this application, the optical imaging device satisfies: 0.35 < (CP6 + CP6b) / EP56 ≤ 1.15; where CP6 is the maximum thickness of the sixth spacer element in the optical axis direction, CP6b is the maximum thickness of the sixth auxiliary spacer element in the optical axis direction, and EP56 is the on-axis distance from the image side of the fifth spacer element to the object side of the sixth spacer element.

[0016] In summary, when the optical imaging device in the above embodiments of this application satisfies the relationships 0.9≤tan(Semi-FOV) / fno<1 and 0<f1 / f7<0.30, the optical imaging device has a large field of view. At the same time, the refractive power of the first lens is much greater than that of the seventh lens, and the difference in refractive power between the first and last lenses is large. At this time, the MTF of the optical imaging device in the meridional and sagittal directions is asymmetrically attenuated, the contrast of the edge field of view is reduced, and thus the MTF high-frequency collapse is caused. Based on this, this application optimizes the curvature combination of the object-side end face inner diameter d0s of the lens barrel, the curvature radius R1 of the object-side surface of the first lens, and the curvature radius R2 of the image-side surface of the first lens by constraining the relationship 1.65 < (R1-R2) / d0s < 2.25. At the same time, it restricts the inner diameter of the object-side end face of the lens barrel. By controlling the relationship between the inner diameter of the object-side end face of the lens barrel and the two side profiles of the first lens, the trajectory of the principal ray in the first lens is restricted, thereby balancing the meridional and sagittal astigmatism separation after the light enters the optical imaging device, improving the off-axis MTF consistency, and thus improving the problem of high-frequency collapse of MTF. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structural parameters of an optical imaging device according to one embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the structure of an optical imaging device according to Embodiment 1 of this application;

[0019] Figure 3 This is a schematic diagram of the structure of an optical imaging device according to Embodiment 2 of this application;

[0020] Figure 4 This is a schematic diagram of the structure of an optical imaging device according to Embodiment 3 of this application;

[0021] Figure 5A A schematic diagram of the on-axis chromatic aberration curves of the optical imaging apparatus according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown.

[0022] Figure 5B A schematic diagram of astigmatism curves of the optical imaging apparatus according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown;

[0023] Figure 5C A schematic diagram of the distortion curves of the optical imaging device according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown;

[0024] Figure 6 This is a schematic diagram of the structure of an optical imaging device according to Embodiment 4 of this application;

[0025] Figure 7 This is a schematic diagram of the structure of an optical imaging device according to Embodiment 5 of this application;

[0026] Figure 8 This is a schematic diagram of the structure of an optical imaging device according to Embodiment Six of this application;

[0027] Figure 9A A schematic diagram of the on-axis chromatic aberration curves of the optical imaging apparatus according to Embodiments 4, 5 and 6 of this application is shown.

[0028] Figure 9B A schematic diagram of astigmatism curves of the optical imaging apparatus according to Embodiments 4, 5 and 6 of this application is shown.

[0029] Figure 9C A schematic diagram of the distortion curves of the optical imaging apparatus according to Embodiments 4, 5 and 6 of this application is shown.

[0030] Figure 10 This is a schematic diagram of the structure of an optical imaging device according to Embodiment Seven of this application;

[0031] Figure 11 This is a schematic diagram of the structure of an optical imaging device according to Embodiment 8 of this application;

[0032] Figure 12 This is a schematic diagram of the structure of an optical imaging device according to Embodiment 9 of this application;

[0033] Figure 13A A schematic diagram of the on-axis chromatic aberration curves of the optical imaging apparatus according to Embodiments 7, 8 and 9 of this application is shown.

[0034] Figure 13B A schematic diagram of the astigmatism curves of the optical imaging apparatus according to Embodiments 7, 8 and 9 of this application is shown.

[0035] Figure 13C A schematic diagram of the distortion curves of the optical imaging apparatus according to Embodiments 7, 8 and 9 of this application is shown.

[0036] Figure 14 The MTF performance of the optical imaging device is shown when the relationships tan(Semi-FOV) / fno=0.91; f1 / f7=0.26 and (R1-R2) / d0s=1.94 are satisfied.

[0037] Figure 15The MTF performance of the optical imaging device is shown when the relationships tan(Semi-FOV) / fno=0.91; f1 / f7=0.26 and (R1-R2) / d0s=1.50 are satisfied.

[0038] Figure 16 The MTF performance of the optical imaging device is shown when the relationships tan(Semi-FOV) / fno=0.91; f1 / f7=0.26 and (R1-R2) / d0s=2.50 are satisfied. Detailed Implementation

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] According to one aspect of this application, such as Figure 1As shown, one embodiment of this application proposes an optical imaging device, including a lens barrel and a lens group and a plurality of spacers housed within the lens barrel; the lens barrel has an object-side end face, an image-side end face, an outer ring surface, and an inner ring surface; the lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object side to the image side; the plurality of spacers include a first spacer element placed between the first lens and the second lens and in contact with the image-side surface of the first lens, a second spacer element placed between the second lens and the third lens and in contact with the image-side surface of the second lens, a third spacer element placed between the third lens and the fourth lens and in contact with the image-side surface of the third lens, a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens, and a sixth spacer element placed between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens.

[0047] The optical imaging device satisfies: 0.9 ≤ tan(Semi-FOV) / fno < 1; 0 < f1 / f7 < 0.30; and 1.65 < (R1-R2) / d0s < 2.25; where Semi-FOV is half of the maximum field of view of the optical imaging device, fno is the aperture coefficient of the optical imaging device, f1 is the effective focal length of the first lens, f7 is the effective focal length of the seventh lens, d0s is the inner diameter of the object-side end face of the lens barrel, R1 is the radius of curvature of the object-side surface of the first lens, and R2 is the radius of curvature of the image-side surface of the first lens.

[0048] It is worth noting that when the optical imaging device in the above embodiments of this application satisfies the relationship 0.9≤tan(Semi-FOV) / fno<1 and 0<f1 / f7<0.30, the optical imaging device has a large field of view. At the same time, the refractive power of the first lens is much greater than that of the seventh lens, and the difference in refractive power between the first and last lenses is large. At this time, the MTF of the optical imaging device in the meridional and sagittal directions is asymmetrically attenuated, the contrast of the edge field of view is reduced, and thus the MTF high-frequency collapse is caused. Based on this, this application optimizes the curvature combination of the object-side radius of curvature R1 and the image-side radius of curvature R2 of the first lens by constraining the outer diameter d0s of the object-side end face of the lens barrel, the radius of curvature R1 of the object-side surface of the first lens, and the radius of curvature R2 of the image-side surface of the first lens to satisfy the relationship 1.65 < (R1-R2) / d0s < 2.25. At the same time, it restricts the inner diameter of the object-side surface of the lens barrel. By controlling the relationship between the inner diameter of the object-side surface of the lens barrel and the two side profiles of the first lens, the trajectory of the principal ray in the first lens is restricted, thereby balancing the meridional and sagittal astigmatism separation after the light enters the optical system, improving the off-axis MTF consistency, and thus improving the problem of high-frequency collapse of MTF.

[0049] For example, Figure 14 The MTF performance of the optical imaging device is shown when the relationships tan(Semi-FOV) / fno=0.91; f1 / f7=0.26 and (R1-R2) / d0s=1.94 are satisfied. Figure 15 The MTF performance of the optical imaging device is shown when the relationships tan(Semi-FOV) / fno=0.91; f1 / f7=0.26 and (R1-R2) / d0s=1.50 are satisfied. Figure 16 The MTF performance of the optical imaging device is shown when the relationships tan(Semi-FOV) / fno=0.91, f1 / f7=0.26, and (R1-R2) / d0s=2.50 are satisfied. It is easy to see from the figure that: Figure 14 As shown, when the relation (R1-R2) / d0s is in the range greater than 1.65 and less than 2.25, Figure 14 In the MTF plot shown, the MTF in both the meridional and sagittal directions of each field of view is greater than 0.3 at low frequency (45 lp / mm), mid frequency (90 lp / mm), and high frequency (180 lp / mm), indicating good imaging performance of the optical imaging device. Figure 15As shown, when the relationship (R1-R2) / d0s is less than or equal to 1.65, due to the large diameter of the image-side end face of the lens barrel, the geometric gap between the seventh lens and the inner wall of the lens barrel increases. After the light passes through the seventh lens and the image-side side of the lens barrel, both meridional and sagittal astigmatism exhibit a certain degree of separation in all frequency bands. The MTF in the sagittal direction of the high-frequency (180lp / mm) edge field of view (field of view after 2.5mm image height) drops below 0.2, resulting in poor imaging performance of the optical imaging device. Figure 16 As shown, when the relation (R1-R2) / d0s is greater than or equal to 2.25, the diameter of the object side of the lens tube is too large, the gap between the first lens and the inner wall of the lens tube increases, and when the light passes through the object side of the lens tube and the first lens, the meridional and sagittal astigmatism of each frequency band will be separated to a certain extent. The MTF of the sagittal direction of the high-frequency (180lp / mm) edge field of view (field of view after 2.5mm image height) drops below 0.2, and the imaging performance of the optical imaging device is poor.

[0050] Preferably, the optical imaging device satisfies: 0.9≤tan(Semi-FOV) / fno≤0.96; 0.03≤f1 / f7≤0.28; and 1.68≤(R1-R2) / d0s≤2.21.

[0051] In one embodiment of this application, the optical imaging device satisfies: 0.75 < EP12 / (CT1+CT2) < 0.95; where EP12 is the axial distance from the image side of the first spacer element to the object side of the second spacer element, CT1 is the center thickness of the first lens, and CT2 is the center thickness of the second lens.

[0052] In this way, by limiting the ratio of the axial distance EP12 between the image side of the first spacer element and the object side of the second spacer element to the sum of the center thicknesses of the first and second lenses (CT1+CT2) to satisfy the above relationship, the thicknesses of the spacer elements and lenses can be precisely matched, blocking the lateral propagation path of stray light and reducing the intensity of scattered stray light. If the ratio of EP12 to CT1+CT2 is less than 0.75, the distance between the first and second spacer elements is too small, resulting in the exposure of the inner wall of the lens barrel between the first and second lenses, and large-angle incident light rays are prone to form scattered stray light on the surface of the lens barrel; if the ratio of EP12 to CT1+CT2 is greater than 0.95, the distance between the first and second spacer elements is too large, and ambient stray light is prone to intrusion through the gap between the effective diameter edge of the second lens and the second spacer element.

[0053] Preferably, the optical imaging device satisfies: 0.76≤EP12 / (CT1+CT2)≤0.94.

[0054] In one embodiment of this application, the optical imaging device satisfies: 0.05 < (EP12 - EP23) / (f2 - f3) < 1.20; where EP12 is the axial distance from the image side of the first spacer element to the object side of the second spacer element, EP23 is the axial distance from the image side of the second spacer element to the object side of the third spacer element, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens.

[0055] In this way, by limiting the ratio of the on-axis distance between the image side of the first spacer element and the object side of the second spacer element and the difference between the on-axis distance between the image side of the second spacer element and the object side of the third spacer element (EP12-EP23) to the difference between the effective focal length of the second lens and the effective focal length of the third lens (f2-f3), it can be ensured that the difference between the region between the first spacer element and the second spacer element and the region between the second spacer element and the third spacer element is proportional to the difference in optical power between the second lens and the third lens. By reasonably arranging the lateral positions of the first spacer element, the second spacer element and the third spacer element, the lateral propagation path of large-angle stray light between the second lens and the third lens can be effectively blocked, so as to attenuate stray light energy.

[0056] Preferably, the optical imaging device satisfies: 0.08≤(EP12-EP23) / (f2-f3)≤1.16.

[0057] In one embodiment of this application, the optical imaging device satisfies: 0 < (d3s - d2m) / CT3 < 0.25; where d2m is the image-side inner diameter of the second spacer element, d3s is the object-side inner diameter of the third spacer element, and CT3 is the center thickness of the third lens.

[0058] In this way, by limiting the ratio of the difference between the object-side inner diameter of the third spacer element and the object-side inner diameter of the second spacer element (d3s-d2m) to the center thickness CT3 of the third lens, the second and third spacer elements form a stepped blocking structure with a reasonable difference, thereby blocking the reflection and transmission paths of stray light in the region from the second to the third lens. After optimization, the optical imaging device maintains high sensitivity and a large field of view, reduces the intensity of stray light on the image plane, decreases the ghost density at the edge of the field of view, and can significantly improve imaging uniformity.

[0059] Preferably, the optical imaging device satisfies: 0.01≤(d3s-d2m) / CT3≤0.24.

[0060] In one embodiment of this application, the optical imaging device satisfies: 2.55 < (CT3 + CT5) / CT4 ≤ 3.90; where CT3 is the center thickness of the third lens, CT4 is the center thickness of the fourth lens, and CT5 is the center thickness of the fifth lens.

[0061] Thus, by limiting the ratio of the sum of the center thicknesses of the third and fifth lenses (CT3+CT5) to the center thickness CT4 of the fourth lens to satisfy the above relationship, the thickness ratios of the third, fourth, and fifth lenses can be controlled, suppressing stray light reflections between the third and fifth lenses. After optimization, the optical imaging device maintains a large field of view and compactness while reducing stray light intensity between the third and fifth lenses, decreasing halo density on the imaging surface, and significantly improving imaging contrast.

[0062] Preferably, the optical imaging device satisfies: 2.56≤(CT3+CT5) / CT4≤3.90.

[0063] In one embodiment of this application, the optical imaging device satisfies: -2.05 < (R7 + R8) / f4 ≤ 9.20; where f4 is the effective focal length of the fourth lens, R7 is the radius of curvature of the object side of the fourth lens, and R8 is the radius of curvature of the image side of the fourth lens.

[0064] Thus, by ensuring that the ratio of the sum of the radii of curvature (R7+R8) of the object-side and image-side surfaces of the fourth lens to the effective focal length f4 of the fourth lens satisfies the above relationship, the ratio of the curvature radius to the optical power of the fourth lens can be limited, suppressing reflected stray light and ambient stray light from penetrating the object-side and image-side surfaces of the fourth lens. After optimization, the optical imaging device can reduce stray light intensity in the fourth lens area, reduce image ghost density, and improve imaging uniformity while maintaining a large field of view and high sensitivity.

[0065] Preferably, the optical imaging device satisfies: -2.02≤(R7+R8) / f4≤9.20.

[0066] In one embodiment of this application, the optical imaging device satisfies: 1.05 ≤ < EP34 / CT4 < 1.85; where EP34 is the axial distance from the image side of the third spacer element to the object side of the fourth spacer element, and CT4 is the center thickness of the fourth lens.

[0067] Thus, by ensuring that the ratio of the axial distance EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element to the center thickness CT4 of the fourth lens satisfies the aforementioned relationship, the ratio of the spacing between the third and fourth spacer elements to the thickness of the fourth lens can be controlled. This suppresses the generation of stray light at the edge of the fourth lens from both mechanical structure and optical path design perspectives. After optimization, the optical imaging device maintains a large field of view and high sensitivity while reducing the intensity of stray light in the region between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element.

[0068] Preferably, the optical imaging device satisfies: 1.05≤EP34 / CT4≤1.82.

[0069] In one embodiment of this application, the optical imaging device satisfies: -0.05≤(EP45-CT5) / f5<0.50; where EP45 is the axial distance 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, and f5 is the effective focal length of the fifth lens.

[0070] In this way, by limiting the ratio of the difference between the axial distance from the image side of the fourth spacer element to the object side of the fifth spacer element and the center thickness of the fifth lens (EP45-CT5) to the effective focal length f5 of the fifth lens to satisfy the above relationship, it is possible to adapt to compact optical path design. Under the constraint of the above relationship, the length of the region between the image side of the fourth spacer element and the object side of the fifth spacer element is reasonably matched with the center thickness of the fifth lens, which can avoid mechanical interference and shorten the stray light propagation path.

[0071] Preferably, the optical imaging device satisfies: -0.05≤(EP45-CT5) / f5≤0.49.

[0072] In one embodiment of this application, the optical imaging device satisfies: 2.80 < EP56 / CT6 ≤ 3.85; where EP56 is the axial distance from the image side of the fifth spacer element to the object side of the sixth spacer element, and CT6 is the center thickness of the sixth lens.

[0073] In this way, by limiting the ratio of the axial distance EP56 between the image side of the fifth spacer element and the object side of the sixth spacer element to the center thickness CT6 of the sixth lens to satisfy the above relationship, the magnitude of the axial distance between the image side of the fifth spacer element and the object side of the sixth spacer element can be controlled, the trajectory of light passing through the object and image sides of the sixth lens can be controlled, and the generation of stray light at the edge of the sixth lens can be reduced.

[0074] Preferably, the optical imaging device satisfies: 2.83≤EP56 / CT6≤3.85.

[0075] In one embodiment of this application, when the optical imaging device satisfies: 2.80 < EP56 / CT6 < 3.75, the plurality of spacers include a sixth auxiliary spacer element placed on the image side of the sixth spacer element and in contact with the image side side of the sixth spacer element, wherein EP56 is the axial distance from the image side side of the fifth spacer element to the object side side of the sixth spacer element, and CT6 is the center thickness of the sixth lens.

[0076] When 2.80 < EP56 / CT6 < 3.75, the thickness of the non-effective diameter portion of the sixth lens is smaller compared to when 3.75 ≤ EP56 / CT6 ≤ 3.85. At this time, the gap between the edge of the non-effective diameter on the image side of the sixth lens and the edge of the non-effective diameter on the object side of the seventh lens is too large. Therefore, a sixth auxiliary spacer element needs to be introduced to fill the gap between the edges of the sixth and seventh lenses, thereby blocking the propagation path of reflected stray light and ambient stray light from the edges of the sixth and seventh lenses.

[0077] In one embodiment of this application, the optical imaging device satisfies: 0.35 < (CP6 + CP6b) / EP56 ≤ 1.15; where CP6 is the maximum thickness of the sixth spacer element in the optical axis direction, CP6b is the maximum thickness of the sixth auxiliary spacer element in the optical axis direction, and EP56 is the on-axis distance from the image side of the fifth spacer element to the object side of the sixth spacer element.

[0078] In this way, by limiting the ratio of the sum of the maximum thicknesses of the sixth spacer element and the sixth auxiliary spacer element in the optical axis direction (CP6+CP6b) to the axial distance EP56 between the image side of the fifth auxiliary spacer element and the object side of the sixth spacer element to satisfy the above relationship, it is possible to control the formation of a smooth transition structure between the sixth auxiliary spacer element and the sixth spacer element, so that stray light is reflected multiple times at the non-effective diameter of the object side of the seventh lens, thereby reducing the stray light energy of the imaging surface.

[0079] Preferably, the optical imaging device satisfies: 0.38≤(CP6+CP6b) / EP56≤1.15.

[0080] 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.

[0081] The following describes in more detail, with reference to the accompanying drawings, some specific, but not limiting, embodiments of the above-described embodiments of this application. For ease of description, in the following embodiments, OBJ represents the object plane of the optical imaging device, S1 represents the object-side plane of the first lens E1, S2 represents the image-side plane of the first lens E1, S3 represents the object-side plane of the second lens E2, S4 represents the image-side plane of the second lens E2, S5 represents the object-side plane of the third lens E3, S6 represents the image-side plane of the third lens E3, S7 represents the object-side plane of the fourth lens E4, S8 represents the image-side plane of the fourth lens E4, S9 represents the object-side plane of the fifth lens E5, S10 represents the image-side plane of the fifth lens E5, S11 represents the object-side plane of the sixth lens E6, S12 represents the image-side plane of the sixth lens E6, S13 represents the object-side plane of the seventh lens E7, S14 represents the image-side plane of the seventh lens E7, S15 represents the object-side plane of the filter (not shown), S16 represents the image-side plane of the filter (not shown), and S17 represents the image plane of the optical imaging device.

[0082] Example 1

[0083] like Figure 2 As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7; the plurality of spacer elements include a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1, a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1, and a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1. The second spacer element P2 is in contact with the image side of E2; the third spacer element P3 is located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; the fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; the fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and the sixth spacer element P6 is located between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6.

[0084] In this embodiment, the first lens E1 has negative optical power, and its object-side surface S1 and image-side surface S2 are convex and concave, respectively; the second lens E2 has positive optical power, and its object-side surface S3 and image-side surface S4 are concave and convex, respectively; the third lens E3 has positive optical power, and its object-side surface S5 and image-side surface S6 are convex and concave, respectively; the fourth lens E4 has positive optical power, and its object-side surface S7 and image-side surface S8 are both convex; the fifth lens E5 has positive optical power, and its object-side surface S9 and image-side surface S10 are both convex; the sixth lens E6 has negative optical power, and its object-side surface S11 and image-side surface S12 are convex and concave, respectively; the seventh lens E7 has negative optical power, and its object-side surface S13 and image-side surface S14 are both convex and concave, respectively.

[0085] In addition, Table 1 shows the basic optical parameters of the optical imaging lens of Embodiment 1, where the units of radius of curvature and thickness / distance are millimeters (mm).

[0086] Table 1: Basic Optical Parameters of the Optical Imaging Device in Example 1

[0087]

[0088] It should be noted that the materials in Table 1 include refractive index and Abbe number. For example, in Table 1, the materials 1.585 and 33.781 of S1 indicate that the refractive index of the first lens E1 is 1.585 and the Abbe number is 33.781, respectively.

[0089] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape of each aspherical lens is... The following aspherical formulas can be used for limitation:

[0090] ;

[0091] in, Let be the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 that can be used for the aspherical mirrors S1 to S14 in Example 1.

[0092] Table 2: Aspherical Coefficients of the Optical Imaging Device in Example 1

[0093]

[0094] Example 2

[0095] like Figure 3 As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7; the plurality of spacer elements include a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1, a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1, and a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1. The second spacer element P2 is in contact with the image side of E2; the third spacer element P3 is located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; the fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; the fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and the sixth spacer element P6 is located between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6.

[0096] It is worth noting that, compared with Embodiment 1 above, the optical imaging device of Embodiment 2 has the same optical parameters, that is, the basic optical parameter table of the optical imaging device of Embodiment 2 is the same as Table 1, and the aspheric coefficient table is the same as Table 2. The values ​​of each relevant structural parameter in the optical imaging device of Embodiment 2 are shown in Table 8 below.

[0097] Specifically, the values ​​of various related structural parameters in this embodiment and the above embodiment are shown in Table 8 below. These structural parameters specifically include: the image-side inner diameter d2m of the second spacer element P2; the object-side inner diameter d3s of the third spacer element P3; the object-side end face inner diameter d0s of the lens barrel P0; the axial distance EP12 between the image-side surface of the first spacer element P1 and the object-side surface of the second spacer element P2; the axial distance EP23 between the image-side surface of the second spacer element P2 and the object-side surface of the third spacer element P3; the axial distance EP34 between the image-side surface of the third spacer element P3 and the object-side surface of the fourth spacer element P4; the axial distance EP45 between the image-side surface of the fourth spacer element P4 and the object-side surface of the fifth spacer element P5; the axial distance EP56 between the image-side surface of the fifth spacer element P5 and the object-side surface of the sixth spacer element P6; the maximum thickness CP6 of the sixth spacer element in the optical axis direction; and the maximum thickness CP6b of the sixth auxiliary spacer element in the optical axis direction. It is understood that the units for the values ​​of each parameter shown in Table 8 are millimeters (mm), and the schematic diagrams of each parameter in the structural diagram of the optical imaging device are as follows. Figure 1 As shown.

[0098] Example 3

[0099] like Figure 4 As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7; the plurality of spacer elements include a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1, a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1, and a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1. The second spacer element P2 is in contact with the image side of E2; the third spacer element P3 is located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; the fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; the fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and the sixth spacer element P6 is located between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6.

[0100] In this embodiment, the spacing element further includes a fourth auxiliary spacing element P4b disposed between the fourth spacing element P4 and the fifth lens E5 and in contact with the image side of the fourth spacing element P4; a fourth secondary auxiliary spacing element P4c disposed between the fourth auxiliary spacing element P4b and the fifth lens E5 and in contact with the image side of the fourth auxiliary spacing element P4b; a sixth auxiliary spacing element P6b disposed between the sixth spacing element P6 and the seventh lens E7 and in contact with the image side of the sixth spacing element P6; and a sixth secondary auxiliary spacing element P6c disposed between the sixth auxiliary spacing element P6b and the seventh lens E7 and in contact with the image side of the sixth auxiliary spacing element P6b.

[0101] It is worth noting that, compared with Embodiment 1 above, the optical imaging device of Embodiment 3 has the same optical parameters. That is, the basic optical parameter table of the optical imaging device of Embodiment 3 is the same as Table 1, and the aspherical coefficient table is the same as Table 2. The values ​​of various related structural parameters in the optical imaging device of Embodiment 3 are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0102] After testing, the on-axis chromatic aberration curves of the optical imaging devices in Examples 1, 2, and 3 are as follows: Figure 5A As shown, it represents the degree of deviation of the focal point after light of different wavelengths passes through the optical imaging device; the astigmatism curves of the optical imaging devices in Embodiments 1, 2, and 3 are shown below. Figure 5B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical imaging devices in Embodiments 1, 2, and 3 are as follows. Figure 5C As shown, it represents the distortion magnitude of the optical imaging device at different field of view angles. According to... Figure 5A , Figure 5B and Figure 5C It can be seen that the optical imaging devices in Embodiment 1, Embodiment 2 and Embodiment 3 can all achieve good imaging quality.

[0103] Example 4

[0104] like Figure 6As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7; the plurality of spacer elements include a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1, a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1, and a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1. The second spacer element P2 is in contact with the image side of E2; the third spacer element P3 is located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; the fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; the fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and the sixth spacer element P6 is located between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6.

[0105] In this embodiment, the first lens E1 has negative optical power, and its object-side surface S1 and image-side surface S2 are convex and concave, respectively; the second lens E2 has positive optical power, and its object-side surface S3 and image-side surface S4 are concave and convex, respectively; the third lens E3 has positive optical power, and its object-side surface S5 and image-side surface S6 are both convex; the fourth lens E4 has positive optical power, and its object-side surface S7 and image-side surface S8 are both convex; the fifth lens E5 has positive optical power, and its object-side surface S9 and image-side surface S10 are both convex; the sixth lens E6 has negative optical power, and its object-side surface S11 and image-side surface S12 are convex and concave, respectively; the seventh lens E7 has negative optical power, and its object-side surface S13 and image-side surface S14 are both convex and concave, respectively.

[0106] In addition, Table 3 shows the basic optical parameters of the optical imaging lens of Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0107] Table 3: Basic optical parameters of the optical imaging device in Example 4

[0108]

[0109] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S1 to S14 in Embodiment 4.

[0110] Table 4: Aspherical coefficients of the optical imaging device in Example 4

[0111]

[0112] Example 5

[0113] like Figure 7 As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7; the plurality of spacer elements include a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1, a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1, and a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1. The second spacer element P2 is in contact with the image side of E2; the third spacer element P3 is located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; the fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; the fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and the sixth spacer element P6 is located between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6.

[0114] In this embodiment, the spacer element further includes a sixth auxiliary spacer element P6b, which is placed between the sixth spacer element P6 and the seventh lens E7 and contacts the image side of the sixth spacer element P6.

[0115] It is worth noting that, compared with Embodiment 4 above, the optical imaging device of Embodiment 5 has the same optical parameters. That is, the basic optical parameter table of the optical imaging device of Embodiment 5 is the same as Table 3, and the aspherical coefficient table is the same as Table 4. The values ​​of each relevant structural parameter in Embodiment 5 are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0116] Example 6

[0117] like Figure 8 As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7; the plurality of spacer elements include a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1, a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1, and a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1. The second spacer element P2 is in contact with the image side of E2; the third spacer element P3 is located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; the fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; the fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and the sixth spacer element P6 is located between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6.

[0118] In this embodiment, the spacing element further includes a fourth auxiliary spacing element P4b disposed between the fourth spacing element P4 and the fifth lens E5 and in contact with the image side of the fourth spacing element P4; a fourth secondary auxiliary spacing element P4c disposed between the fourth auxiliary spacing element P4b and the fifth lens E5 and in contact with the image side of the fourth auxiliary spacing element P4b; and a sixth auxiliary spacing element P6b disposed between the sixth spacing element P6 and the seventh lens E7 and in contact with the image side of the sixth spacing element P6.

[0119] It is worth noting that, compared with Embodiment 4 above, the optical imaging device of Embodiment 6 has the same optical parameters. That is, the basic optical parameter table of the optical imaging device of Embodiment 6 is the same as Table 3, and the aspherical coefficient table is the same as Table 4. The values ​​of various related structural parameters in the optical imaging device of Embodiment 6 are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0120] After testing, the on-axis chromatic aberration curves of the optical imaging devices in Examples 4, 5, and 6 are as follows: Figure 9A As shown, it represents the degree of deviation of the focal point after light of different wavelengths passes through the optical imaging device; the astigmatism curves of the optical imaging devices in Embodiments 4, 5, and 6 are shown below. Figure 9BAs shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical imaging devices in Embodiments 4, 5, and 6 are as follows. Figure 9C As shown, it represents the distortion magnitude of the optical imaging device at different field of view angles. According to... Figure 9A , Figure 9B and Figure 9C It can be seen that the optical imaging devices in Embodiments 4, 5 and 6 can all achieve good imaging quality.

[0121] Example 7

[0122] like Figure 10 As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7; the plurality of spacer elements include a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1, a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1, and a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1. The second spacer element P2 is in contact with the image side of E2; the third spacer element P3 is located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; the fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; the fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and the sixth spacer element P6 is located between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6.

[0123] In this embodiment, the spacing element further includes a sixth auxiliary spacing element P6b disposed between the sixth spacing element P6 and the seventh lens E7 and in contact with the image side of the sixth spacing element P6, and a sixth secondary auxiliary spacing element P6c disposed between the sixth auxiliary spacing element P6b and the seventh lens E7 and in contact with the image side of the sixth auxiliary spacing element P6b.

[0124] In this embodiment, the first lens E1 has negative optical power, and its object-side surface S1 and image-side surface S2 are convex and concave, respectively; the second lens E2 has positive optical power, and its object-side surface S3 and image-side surface S4 are concave and convex, respectively; the third lens E3 has positive optical power, and its object-side surface S5 and image-side surface S6 are convex and concave, respectively; the fourth lens E4 has positive optical power, and its object-side surface S7 and image-side surface S8 are convex and concave, respectively; the fifth lens E5 has positive optical power, and its object-side surface S9 and image-side surface S10 are both convex; the sixth lens E6 has negative optical power, and its object-side surface S11 and image-side surface S12 are convex and concave, respectively; the seventh lens E7 has negative optical power, and its object-side surface S13 and image-side surface S14 are convex and concave, respectively.

[0125] In addition, Table 5 shows the basic optical parameters of the optical imaging lens of Embodiment 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0126] Table 5: Basic Optical Parameters of the Optical Imaging Device in Example 7

[0127]

[0128] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Table 6 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S1 to S14 in Embodiment 7.

[0129] Table 6: Aspherical Coefficients of the Optical Imaging Device in Example 7

[0130]

[0131] Example 8

[0132] like Figure 11As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7; the plurality of spacer elements include a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1, a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1, and a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1. The second spacer element P2 is in contact with the image side of E2; the third spacer element P3 is located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; the fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; the fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and the sixth spacer element P6 is located between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6.

[0133] In this embodiment, the spacing element further includes a sixth auxiliary spacing element P6b disposed between the sixth spacing element P6 and the seventh lens E7 and in contact with the image side of the sixth spacing element P6, and a sixth secondary auxiliary spacing element P6c disposed between the sixth auxiliary spacing element P6b and the seventh lens E7 and in contact with the image side of the sixth auxiliary spacing element P6b.

[0134] It is worth noting that, compared with Embodiment Seven above, the optical imaging device of Embodiment Eight has the same optical parameters. That is, the basic optical parameter table of the optical imaging device of Embodiment Eight is the same as Table 5, and the aspherical coefficient table is the same as Table 6. The values ​​of each relevant structural parameter in the optical imaging device of Embodiment Eight are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as those in Embodiment Two above, and will not be repeated here.

[0135] Example 9

[0136] like Figure 12As shown, in this embodiment, the optical imaging device includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7; the plurality of spacer elements include a first spacer element P1 positioned between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1, a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1, and a spacer element P1 positioned between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E1. The second spacer element P2 is in contact with the image side of E2; the third spacer element P3 is located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; the fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; the fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and the sixth spacer element P6 is located between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6.

[0137] In this embodiment, the spacing element further includes a sixth auxiliary spacing element P6b disposed between the sixth spacing element P6 and the seventh lens E7 and in contact with the image side of the sixth spacing element P6, and a sixth secondary auxiliary spacing element P6c disposed between the sixth auxiliary spacing element P6b and the seventh lens E7 and in contact with the image side of the sixth auxiliary spacing element P6b.

[0138] It is worth noting that, compared with Embodiment 7 above, the optical imaging device of Embodiment 9 has the same optical parameters. That is, the basic optical parameter table of the optical imaging device of Embodiment 9 is the same as Table 5, and the aspherical coefficient table is the same as Table 6. The values ​​of various related structural parameters in the optical imaging device of Embodiment 9 are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0139] After testing, the on-axis chromatic aberration curves of the optical imaging devices in Examples 7, 8, and 9 are as follows: Figure 13A As shown, it represents the degree of deviation of the focal point after light of different wavelengths passes through the optical imaging device; the astigmatism curves of the optical imaging devices in Embodiments 7, 8, and 9 are shown below. Figure 13B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical imaging devices in Embodiments 7, 8, and 9 are as follows. Figure 13C As shown, it represents the distortion magnitude of the optical imaging device at different field of view angles. According to... Figure 13A , Figure 13B and Figure 13CIt can be seen that the optical imaging devices in Embodiments 7, 8 and 9 can all achieve good imaging quality.

[0140] 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, the effective focal length f of the optical imaging device, the aperture coefficient fno of the optical imaging device, and half of the maximum field of view (Semi-FOV) of the optical imaging device are shown in Table 7 below.

[0141] Table 7: System Optical Parameters of Optical Imaging Device

[0142]

[0143] Furthermore, the structural parameters of the optical imaging devices in Examples 1 to 9 are shown in Table 8.

[0144] Table 8: Structural Parameters of Optical Imaging Devices

[0145]

[0146] In summary, the optical imaging devices in Embodiments 1 to 9 satisfy the relationships shown in Table 9, as detailed in Table 9.

[0147] Table 9: Relationships Satisfying Optical Imaging Devices

[0148]

[0149] 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.

[0150] 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.

[0151] 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.

[0152] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An optical imaging device, characterized in that: The system includes a lens barrel, a lens assembly, and multiple spacer elements housed within the lens barrel. The lens barrel has an object-side end face, an image-side end face, an outer annular surface, and an inner annular surface. The lens assembly comprises seven lenses with optical power, arranged sequentially along the optical axis from the object side to the image side: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with negative optical power. The object-side and image-side surfaces of the first lens are convex and concave, respectively; the object-side and image-side surfaces of the second lens are concave and convex, respectively; the object-side surface of the third lens is convex; the object-side surface of the fourth lens is convex; both the object-side and image-side surfaces of the fifth lens are convex; the object-side and image-side surfaces of the sixth lens are convex. The object-side surface and image-side surface of the seventh lens are convex and concave, respectively; the object-side surface and image-side surface of the seventh lens are convex and concave, respectively; the plurality of spacer elements include a first spacer element placed between the first lens and the second lens and in contact with the image-side surface of the first lens, a second spacer element placed between the second lens and the third lens and in contact with the image-side surface of the second lens, a third spacer element placed between the third lens and the fourth lens and in contact with the image-side surface of the third lens, a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens, and a sixth spacer element placed between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens; the optical imaging device satisfies: 0.9≤tan(Semi-FOV) / fno<1; 0 < f1 / f7 < 0.30; and 1.65 < (R1 - R2) / d0s < 2.25; Wherein, Semi-FOV is half of the maximum field of view of the optical imaging device, fno is the aperture coefficient of the optical imaging device, f1 is the effective focal length of the first lens, f7 is the effective focal length of the seventh lens, d0s is the inner diameter of the object-side end face of the lens barrel, R1 is the radius of curvature of the object-side surface of the first lens, and R2 is the radius of curvature of the image-side surface of the first lens.

2. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 0.75<EP12 / (CT1+CT2)<0.95; Wherein, EP12 is the axial distance from the image side of the first spacer element to the object side of the second spacer element, CT1 is the center thickness of the first lens, and CT2 is the center thickness of the second lens.

3. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 0.05<(EP12-EP23) / (f2-f3)<1.20; Wherein, EP12 is the on-axis distance from the image side of the first spacer element to the object side of the second spacer element, EP23 is the on-axis distance from the image side of the second spacer element to the object side of the third spacer element, f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens.

4. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 0 < (d3s - d2m) / CT3 < 0.25; Wherein, d2m is the image-side inner diameter of the second spacer element, d3s is the object-side inner diameter of the third spacer element, and CT3 is the center thickness of the third lens.

5. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 2.55<(CT3+CT5) / CT4≤3.90; Wherein, CT3 is the center thickness of the third lens, CT4 is the center thickness of the fourth lens, and CT5 is the center thickness of the fifth lens.

6. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: -2.05<(R7+R8) / f4≤9.20; Wherein, f4 is the effective focal length of the fourth lens, R7 is the radius of curvature of the object side of the fourth lens, and R8 is the radius of curvature of the image side of the fourth lens.

7. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 1.05≤EP34 / CT4<1.85; Wherein, EP34 is the axial distance from the image side of the third spacer element to the object side of the fourth spacer element, and CT4 is the center thickness of the fourth lens.

8. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: -0.05≤(EP45-CT5) / f5<0.50; Wherein, EP45 is the axial distance 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, and f5 is the effective focal length of the fifth lens.

9. The optical imaging device according to claim 1, characterized in that, The optical imaging device satisfies: 2.80 < EP56 / CT6 ≤ 3.85; Wherein, EP56 is the axial distance from the image side of the fifth spacer element to the object side of the sixth spacer element, and CT6 is the center thickness of the sixth lens.

10. The optical imaging device according to claim 1, characterized in that, When the optical imaging device satisfies: 2.80 < EP56 / CT6 < 3.75, the plurality of spacers include a sixth auxiliary spacer that is placed on the image side of the sixth spacer and in contact with the image side of the sixth spacer, wherein EP56 is the axial distance from the image side of the fifth spacer to the object side of the sixth spacer, and CT6 is the center thickness of the sixth lens.

11. The optical imaging device according to claim 10, characterized in that, The optical imaging device satisfies: 0.35<(CP6+CP6b) / EP56≤1.15; Wherein, CP6 is the maximum thickness of the sixth spacer element in the optical axis direction, CP6b is the maximum thickness of the sixth auxiliary spacer element in the optical axis direction, and EP56 is the on-axis distance from the image side of the fifth spacer element to the object side of the sixth spacer element.

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