Optical imaging device

Abstract

The invention provides an optical imaging apparatus. The optical imaging device comprises a lens barrel, a lens group and a plurality of spacing elements, and the lens group is composed of six lenses. The six lenses are sequentially a first lens with negative focal power, a second lens with positive focal power, a third lens with focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with negative focal power; fOV is greater than or equal to 117.00 degrees and less than or equal to 130.00 degrees; d3m / CT3 is greater than or equal to 2.16 and less than or equal to 6.43; and d2m / d3m is more than or equal to 1.11 and less than or equal to 2.18. According to the invention, the problem that the six-piece wide-angle optical imaging device in the prior art is poor in assembly stability due to the fact that the shape and the size of the front-end lens are easy to unreasonably design in order to match large-view-field light and the front-end lens is easy to deform under the influence of stress during assembly is solved.

Description

Technical Field

[0001] This invention relates to the field of optical imaging equipment technology, and more specifically, to an optical imaging device. Background Technology

[0002] With the rapid development of technology, the design and performance requirements of optical imaging devices, especially wide-angle optical imaging devices used in mobile devices, monitoring systems, and virtual reality (VR) and augmented reality (AR) devices, are becoming increasingly stringent. In the existing technology, six-element wide-angle optical imaging devices are widely used due to their compact structure and cost-effectiveness.

[0003] However, while six-element wide-angle optical imaging devices excel in many aspects, they also face some technical challenges. One of the most significant problems is that, in order to match the large field of view, the center thickness and shape of the second and third lenses are prone to design flaws. This can lead to concentrated edge stress during assembly of the second and third lenses, which in turn can cause deformation under pressure during assembly, severely affecting the assembly stability and performance stability of the second and third lenses.

[0004] In other words, existing six-element wide-angle optical imaging devices have the problem that the shape and size of the front lens are easily designed unreasonably in order to match the large field of view light, and are easily deformed by stress during assembly, resulting in poor assembly stability. Summary of the Invention

[0005] The main objective of this invention is to provide an optical imaging device that solves the problem in existing six-element wide-angle optical imaging devices where the shape and size of the front lens are easily designed unreasonably to match the large field of view light, and are easily deformed by stress during assembly, resulting in poor assembly stability.

[0006] To achieve the above objectives, according to one aspect of the present invention, an optical imaging device is provided, comprising a lens barrel and a lens group and a plurality of spacers disposed within the lens barrel. The lens group consists of six lenses, which are arranged sequentially from the object side to the image side along the optical axis of the optical imaging device as follows: a first lens with negative optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power. The plurality of spacers includes elements disposed between the second and third lenses and adjacent to the image side of the second lens. The second spacer element is in contact with the third lens and the fourth lens, and the third spacer element is placed between the third lens and the fourth lens and in contact with the image side of the third lens; the maximum field of view (FOV) of the optical imaging device satisfies: 117.00°≤FOV≤130.00°; the inner diameter d3m of the image side of the third spacer element and the center thickness CT3 of the third lens on the optical axis satisfy: 2.16≤d3m / CT3≤6.43; the inner diameter d3m of the image side of the third spacer element and the inner diameter d2m of the image side of the second spacer element satisfy: 1.11≤d2m / d3m≤2.18.

[0007] According to another aspect of the present invention, an optical imaging device is also provided, comprising a lens barrel and a lens group and a plurality of spacers disposed in the lens barrel. The lens group consists of six lenses, which are arranged sequentially from the object side to the image side along the optical axis of the optical imaging device as follows: a first lens with negative optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power. The plurality of spacers include a first spacer disposed between the first lens and the second lens and in contact with the image side of the first lens, and a spacer disposed between the second lens and the third lens and in contact with the image side of the second lens. The second spacer element, the third spacer element placed between the third and fourth lenses and in contact with the image side of the third lens; the maximum field of view (FOV) of the optical imaging device satisfies: 117.00°≤FOV≤130.00°; the inner diameter d1s of the object side of the first spacer element, the air gap T12 between the first and second lenses on the optical axis and the inner diameter d2s of the object side of the second spacer element satisfy: 0.34≤T12 / (d1s-d2s)≤2.41; the inner diameter d3m of the image side of the third spacer element and the inner diameter d2m of the image side of the second spacer element satisfy: 1.11≤d2m / d3m≤2.18.

[0008] According to another aspect of the present invention, an optical imaging device is also provided, comprising a lens barrel and a lens group and a plurality of spacer elements disposed within the lens barrel. The lens group consists of six lenses, which are arranged sequentially from the object side to the image side along the optical axis of the optical imaging device as follows: a first lens with negative optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power. The plurality of spacer elements includes elements disposed between the first lens and the second lens and in contact with the image side surface of the first lens. A first spacer element, a second spacer element positioned between the second and third lenses and in contact with the image-side surface of the second lens, and a third spacer element positioned between the third and fourth lenses and in contact with the image-side surface of the third lens; the maximum field of view (FOV) of the optical imaging device satisfies: 117.00° ≤ FOV ≤ 130.00°; the distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element on the optical axis, and the inner diameter d3m of the image-side surface of the third spacer element and the inner diameter d2m of the image-side surface of the second spacer element satisfy: 0.75 <EP23 / (d2m-d3m)<2.78。

[0009] Furthermore, the inner diameter d3m of the image side of the third spacer element, the center thickness CT4 of the fourth lens on the optical axis, and the outer diameter D3m of the image side of the third spacer element satisfy the following condition: 3.03≤(D3m-d3m) / CT4≤9.45.

[0010] Furthermore, the distance EP23 between the image side of the second spacer element and the object side of the third spacer element on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy the following condition: 1.15≤EP23 / CT3≤2.13.

[0011] Furthermore, the radius of curvature R5 of the object side of the third lens and the inner diameter d2m of the image side of the second spacer element satisfy the following: -3.07≤R5 / d2m≤-0.80; the effective focal length f3 of the third lens and the inner diameter d2m of the image side of the second spacer element satisfy the following: -3.01≤f3 / d2m≤2.08.

[0012] Furthermore, the plurality of spacers also includes a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, wherein the effective focal length f4 of the fourth lens and the inner diameter d4s of the object side of the fourth spacer element satisfy the following condition: 0.81≤f4 / d4s≤4.20.

[0013] Furthermore, the plurality of spacers also includes a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens. The inner diameter d4m of the image side of the fourth spacer element, the air gap T45 between the fourth lens and the fifth lens on the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy the following: 0.97≤d4m / (T45+CT5)≤2.88.

[0014] Furthermore, the plurality of spacers also includes a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, and a fourth auxiliary spacer element placed between the fourth spacer element and the fifth lens and in contact with the image side of the fourth spacer element. The air gap T45 between the fourth lens and the fifth lens on the optical axis, the maximum axial thickness CP4 of the fourth spacer element, and the maximum axial thickness CP4b of the fourth auxiliary spacer element satisfy the following: 1.20≤(CP4+CP4b) / T45≤13.61.

[0015] Furthermore, the distance EP23 between the image side of the second spacer element and the object side of the third spacer element on the optical axis and the air gap T23 between the second lens and the third lens on the optical axis satisfy the following condition: 1.07≤EP23 / T23≤6.09.

[0016] Furthermore, the inner diameter d2s of the object side of the second spacer element, the center thickness CT2 of the second lens on the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis satisfy the following: 1.15≤d2s / (CT2+T23)≤2.90.

[0017] Furthermore, the plurality of spacers also includes a first spacer element placed between the first lens and the second lens and in contact with the image side of the first lens. The inner diameter d1s of the object side of the first spacer element, the air gap T12 between the first lens and the second lens on the optical axis and the inner diameter d2s of the object side of the second spacer element satisfy the following: 0.34≤T12 / (d1s-d2s)≤2.41.

[0018] Furthermore, the plurality of spacers also includes a first spacer element placed between the first lens and the second lens and in contact with the image side of the first lens. The distance EP01 between the object side of the lens barrel and the object side of the first spacer element on the optical axis satisfies the following condition with respect to the center thickness CT1 of the first lens on the optical axis: 2.29≤EP01 / CT1≤4.22.

[0019] Furthermore, the plurality of spacers also includes a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens. The inner diameter d5s of the object side of the fifth spacer element satisfies the following condition with respect to the effective focal length f5 of the fifth lens: 0.95≤d5s / f5≤1.61; the inner diameter d5s of the object side of the fifth spacer element satisfies the following condition with respect to the center thickness CT5 of the fifth lens on the optical axis: 2.75≤d5s / CT5≤3.18.

[0020] Furthermore, the plurality of spacers also includes a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, and a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens. The spacing distance EP45 between the image side of the fourth spacer element and the object side of the fifth spacer element on the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy the following: 0.56≤CT5 / EP45≤4.36.

[0021] Furthermore, the plurality of spacers also includes 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. The inner diameter d5m of the image-side surface of the fifth spacer element satisfies the following condition with respect to the effective focal length f6 of the sixth lens: -4.88≤f6 / d5m≤-0.70.

[0022] Furthermore, the inner diameter d0m of the image side of the microscope tube and the inner diameter d0s of the object side of the microscope tube satisfy the following condition: 1.30≤d0s / d0m≤1.92.

[0023] Applying the technical solution of this invention, the optical imaging device of this application consists of a lens barrel and six lenses and multiple spacer elements disposed in the lens barrel. By planning that the first lens has negative optical power, the second lens has positive optical power, the third lens has optical power, the fourth lens has positive optical power, the fifth lens has positive optical power, and the sixth lens has negative optical power, and satisfying 117.00°≤FOV≤130.00°, it can be seen that in order to ensure that the second and third lenses at the front end can match the large field of view light, the center thickness and shape of the second and third lenses are prone to unreasonable design. This can easily lead to relatively concentrated edge stress during the assembly of the second and third lenses, which in turn can easily cause deformation of the second and third lenses under pressure during the assembly process, seriously affecting the assembly stability and performance stability of the second and third lenses. Therefore, by constraining 2.16≤d3m / CT3≤6.43 and 1.11≤d2m / d3m≤2.18, this application effectively controls the proportional relationship between the inner diameter of the image side of the third spacer element and the central thickness of the third lens on the optical axis, as well as the proportional relationship between the inner diameter of the image side of the second spacer element and the inner diameter of the image side of the third spacer element. By controlling the dimensions of the second and third spacers element and the central thickness of the third lens on the optical axis, it is beneficial to ensure that the shape of the third lens is relatively smooth, and at the same time, it can ensure that the contact area between the second lens and the second spacer element is large enough, and the contact area between the third lens and the third spacer element is large enough, thereby reasonably transitioning stress, avoiding stress concentration, and ensuring the assembly stability of the second and third lenses in the lens barrel. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1 A schematic diagram showing the dimensions of an optical imaging device according to an alternative embodiment of the present invention is provided.

[0026] Figure 2 A schematic diagram of the structure of the optical imaging device according to Embodiment 1-1 of the present invention is shown;

[0027] Figure 3 A schematic diagram of the optical imaging device according to embodiments 1-2 of the present invention is shown;

[0028] Figure 4 The diagram shows the structural schematics of the optical imaging devices according to embodiments 1-3 of the present invention;

[0029] Figure 5 The on-axis chromatic aberration curve of the optical imaging device according to Embodiment 1 of the present invention is shown;

[0030] Figure 6 The astigmatism curve of the optical imaging device according to Embodiment 1 of the present invention is shown;

[0031] Figure 7 The magnification chromatic aberration curve of the optical imaging device according to Embodiment 1 of the present invention is shown;

[0032] Figure 8 A schematic diagram of the optical imaging device according to Embodiment 2-1 of the present invention is shown;

[0033] Figure 9 A schematic diagram of the structure of the optical imaging device according to Embodiment 2-2 of the present invention is shown;

[0034] Figure 10 The diagram shows a schematic representation of the optical imaging device according to embodiments 2-3 of the present invention.

[0035] Figure 11 The on-axis chromatic aberration curve of the optical imaging device according to Embodiment 2 of the present invention is shown;

[0036] Figure 12 The astigmatism curve of the optical imaging device according to Embodiment 2 of the present invention is shown;

[0037] Figure 13 The magnification chromatic aberration curve of the optical imaging device according to Embodiment 2 of the present invention is shown;

[0038] Figure 14 A schematic diagram of the optical imaging device according to Embodiment 3-1 of the present invention is shown;

[0039] Figure 15 A schematic diagram of the optical imaging device according to Embodiment 3-2 of the present invention is shown;

[0040] Figure 16 A schematic diagram of the structure of the optical imaging device according to Embodiments 3-3 of the present invention is shown;

[0041] Figure 17 The on-axis chromatic aberration curve of the optical imaging device according to Embodiment 3 of the present invention is shown;

[0042] Figure 18 The astigmatism curve of the optical imaging device according to Embodiment 3 of the present invention is shown;

[0043] Figure 19 The magnification chromatic aberration curve of the optical imaging device according to Embodiment 3 of the present invention is shown;

[0044] Figure 20The stress diagram of the second and third lenses of the optical imaging device of Scheme 1 of the present invention is shown when FOV = 123.50°, d3m / CT3 = 2.32 and d2m / d3m = 1.22.

[0045] Figure 21 The stress diagrams of the second and third lenses of the optical imaging device of Comparative Example 1 are shown when FOV = 123.50°, d3m / CT3 = 12.00 and d2m / d3m = 5.28.

[0046] Figure 22 The stress diagrams of the second and third lenses of the optical imaging device of Comparative Example 2 are shown when FOV = 123.50°, d3m / CT3 = 0.20 and d2m / d3m = 0.10.

[0047] The above figures include the following reference numerals:

[0048] P0, Lens tube; E1, First lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; E2, Second lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; E3, Third lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; E4, Fourth lens; S7, Object-side surface of the fourth lens; S8, Image-side surface of the fourth lens; E5, Fifth lens; S9, Object-side surface of the fifth lens; S10, Image-side surface of the fifth lens; E6, Sixth lens; S11, Object-side surface of the sixth lens; S12, Image-side surface of the sixth lens; P1, First spacer element; P2, Second spacer element; P2b, Second auxiliary spacer element; P3, Third spacer element; P3b, Third auxiliary spacer element; P4, Fourth spacer element; P4b, Fourth auxiliary spacer element; P5, Fifth spacer element. Detailed Implementation

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0051] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0052] 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.

[0053] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0054] In this paper, the paraxial region refers to the area near the optical axis. If the lens surface is convex and its location is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and its location 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 based on the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software). For the object side, a positive R value indicates a convex surface, and a negative R value indicates a concave surface; for the image side, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0055] In this application, the object side refers to the side of the optical imaging device facing the object being photographed (not shown in the figure), and the image side refers to the side of the optical imaging device facing the imaging plane (not shown in the figure). hereinafter, the object side of a lens refers to the surface of the lens facing the object being photographed (not shown in the figure), and the image side of a lens refers to the surface of the lens facing the imaging plane (not shown in the figure). In the structural schematic diagram shown in this application, the left side is the object side, and the right side is the image side.

[0056] To address the problems of existing six-element wide-angle optical imaging devices where the shape and size of the front lens are easily misdesigned to match the large field of view, leading to deformation during assembly due to stress and poor assembly stability, this invention provides an optical imaging device.

[0057] like Figures 1 to 19As shown, in an optional embodiment of this application, the optical imaging device includes a lens barrel and a lens group and a plurality of spacer elements disposed in the lens barrel. The lens group consists of six lenses, which are arranged sequentially from the object side to the image side along the optical axis of the optical imaging device as follows: a first lens with negative optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power. The plurality of spacer elements includes a first lens disposed between the second lens and the third lens and in contact with the image side of the second lens. Two spacers, a third spacer placed between the third and fourth lenses and in contact with the image-side surface of the third lens; the maximum field of view (FOV) of the optical imaging device satisfies: 117.00°≤FOV≤130.00°; the inner diameter d3m of the image-side surface of the third spacer and the center thickness CT3 of the third lens on the optical axis satisfy: 2.16≤d3m / CT3≤6.43; the inner diameter d3m of the image-side surface of the third spacer and the inner diameter d2m of the image-side surface of the second spacer satisfy: 1.11≤d2m / d3m≤2.18.

[0058] The optical imaging device of this application consists of a lens barrel and six lenses and multiple spacer elements disposed within the lens barrel. By designing the first lens to have negative optical power, the second lens to have positive optical power, the third lens to have optical power, the fourth lens to have positive optical power, the fifth lens to have positive optical power, and the sixth lens to have negative optical power, and satisfying 117.00°≤FOV≤130.00°, it is evident that in order to ensure that the second and third lenses at the front end can match the large field of view of the light rays, the center thickness and shape of the second and third lenses are prone to unreasonable design. This can easily lead to relatively concentrated edge stress during the assembly of the second and third lenses, which in turn can easily cause deformation of the second and third lenses under pressure during the assembly process, seriously affecting the assembly stability and performance stability of the second and third lenses. Therefore, by constraining 2.16≤d3m / CT3≤6.43 and 1.11≤d2m / d3m≤2.18, this application effectively controls the proportional relationship between the inner diameter of the image side of the third spacer element and the central thickness of the third lens on the optical axis, as well as the proportional relationship between the inner diameter of the image side of the second spacer element and the inner diameter of the image side of the third spacer element. By controlling the dimensions of the second and third spacers element and the central thickness of the third lens on the optical axis, it is beneficial to ensure that the shape of the third lens is relatively smooth, and at the same time, it can ensure that the contact area between the second lens and the second spacer element is large enough, and the contact area between the third lens and the third spacer element is large enough, thereby reasonably transitioning stress, avoiding stress concentration, and ensuring the assembly stability of the second and third lenses in the lens barrel.

[0059] It should be noted that each lens in this application is composed of an integrally formed optical effective diameter portion and a mechanism portion. The mechanism portion is annular and connected to the outer peripheral side of the optical effective diameter portion. The optical effective diameter portion is used for the passage of imaging light and participates in imaging; while the mechanism portion is not used for the passage of imaging light and does not participate in imaging, but is used to contact adjacent spacer elements, adjacent lenses or lens barrels.

[0060] In addition, please refer to Table 1 below. Figures 20 to 22 As shown, Figure 20 The stress diagram of the second and third lenses of the optical imaging device of Scheme 1 of the present invention is shown when FOV = 123.50°, d3m / CT3 = 2.32 and d2m / d3m = 1.22. Figure 21 The stress diagrams of the second and third lenses of the optical imaging device of Comparative Example 1 are shown when FOV = 123.50°, d3m / CT3 = 12.00 and d2m / d3m = 5.28. Figure 22 The stress diagrams of the second and third lenses of the optical imaging device of Comparative Example 2 are shown when FOV = 123.50°, d3m / CT3 = 0.20 and d2m / d3m = 0.10.

[0061] Depend on Figures 20 to 22 It can be seen that when FOV = 123.50°, d3m / CT3 = 2.32, and d2m / d3m = 1.22 are satisfied, the maximum value of the assembly stress of the second and third lenses is relatively small, resulting in lower assembly stress and better assembly stability. When FOV = 123.50°, d3m / CT3 = 12.00, and d2m / d3m = 5.28 are satisfied, the maximum value of the assembly stress of the second and third lenses is relatively large, resulting in higher assembly stress and poorer assembly stability. When FOV = 123.50°, d3m / CT3 = 0.20, and d2m / d3m = 0.10 are satisfied, the maximum value of the assembly stress of the second and third lenses is also relatively large, resulting in higher assembly stress and poorer assembly stability. Therefore, under the premise of satisfying the wide angle, by controlling d3m / CT3 within the range of 2.16 to 6.43 and d2m / d3m within the range of 1.11 to 2.18, the maximum value of the assembly stress of the second and third lenses is smaller, the assembly stress is smaller, and the assembly stability is better.

[0062] Table 1

[0063]

[0064] In this embodiment, the plurality of spacers further includes a first spacer element placed between the first lens and the second lens and in contact with the image side of the first lens, a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, a fourth auxiliary spacer element placed between the fourth spacer element and the fifth lens and in contact with the image side of the fourth spacer element, and a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens.

[0065] In this embodiment, the inner diameter d3m of the image-side surface of the third spacer element, the center thickness CT4 of the fourth lens on the optical axis, and the outer diameter D3m of the image-side surface of the third spacer element satisfy the following condition: 3.03 ≤ (D3m - d3m) / CT4 ≤ 9.45. Constraining this condition ensures the contact radial width between the third lens and the third spacer element, and between the third spacer element and the fourth lens, thus guaranteeing the assembly stability of the third lens, the third spacer element, and the fourth lens within the lens barrel. Simultaneously, limiting the center thickness of the fourth lens helps reduce its sensitivity to the back focal length, ensuring the stability of the optical performance of the optical imaging device.

[0066] In this embodiment, the distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element on the optical axis satisfies the following condition: 1.15 ≤ EP23 / CT3 ≤ 2.13. Constraining this condition ensures that the ratio of the edge thickness to the center thickness of the third lens is within a reasonable range, which is beneficial to the thickness uniformity of the third lens. It also facilitates the shaping of the third lens, enabling the effective optical diameter portion of the third lens to have high surface accuracy.

[0067] In this embodiment, the radius of curvature R5 of the object-side surface of the third lens and the inner diameter d2m of the image-side surface of the second spacer element satisfy the following condition: -3.07 ≤ R5 / d2m ≤ -0.80; the effective focal length f3 of the third lens and the inner diameter d2m of the image-side surface of the second spacer element satisfy the following condition: -3.01 ≤ f3 / d2m ≤ 2.08. By limiting the radius of curvature of the object-side surface of the third lens and the effective focal length of the third lens, the deflection angle of light rays passing through the edge of the third lens can be kept small, reducing the influence of the surface shape of the third lens on the sensitivity of the optical system and ensuring the stability of the optical performance of the optical imaging device before and after the reliability test. At the same time, limiting the inner diameter of the image-side surface of the second spacer element allows the second spacer element to effectively intercept internal stray light at the edge of the third lens, which is beneficial to ensuring the imaging quality of the optical imaging device.

[0068] In this embodiment, the effective focal length f4 of the fourth lens and the inner diameter d4s of the object side of the fourth spacer element satisfy the condition: 0.81 ≤ f4 / d4s ≤ 4.20. This constraint ensures that the fourth spacer element can effectively intercept reflected stray light from the edge of the effective optical diameter portion of the fourth lens, preventing the generation of high-energy stray light spots and guaranteeing the imaging quality of the optical imaging device.

[0069] In this embodiment, the inner diameter d4m of the image-side surface of the fourth spacer element, the air gap T45 between the fourth and fifth lenses on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis satisfy the following condition: 0.97 ≤ d4m / (T45 + CT5) ≤ 2.88. Constraining this condition allows for limiting the air gap between the fourth and fifth lenses on the optical axis and the center thickness of the fifth lens during design, reducing large assembly deviations between the fourth and fifth lenses and thus minimizing sensitivity to the back focal length. Simultaneously, limiting the inner diameter of the image-side surface of the fourth spacer element effectively ensures the reliability of the fourth spacer element in intercepting stray light.

[0070] In this embodiment, the air gap T45 between the fourth and fifth lenses on the optical axis, the maximum axial thickness CP4 of the fourth spacer element, and the maximum axial thickness CP4b of the fourth auxiliary spacer element satisfy the following condition: 1.20 ≤ (CP4 + CP4b) / T45 ≤ 13.61. By controlling the maximum axial thickness of the fourth spacer element and the fourth auxiliary spacer element, the variation in the air gap between the fourth and fifth lenses during assembly can be reduced, improving the problems of field curvature and peak drop in the external field of view, which is beneficial to improving the optical performance of the optical imaging device.

[0071] In this embodiment, the distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element on the optical axis satisfies the following condition: 1.07 ≤ EP23 / T23 ≤ 6.09. By constraining this condition, the edge thickness of the second lens can be limited, thereby ensuring the bearing strength of the edge of the second lens. During assembly, this helps to reduce the change in the air gap between the second and third lenses, ensuring a smaller change in the field curvature of the optical imaging device before and after baking during the production process, and ensuring the stability of the optical performance of the optical imaging device.

[0072] In this embodiment, the inner diameter d2s of the object side of the second spacer element, the center thickness CT2 of the second lens on the optical axis, and the air gap T23 between the second and third lenses on the optical axis satisfy the following condition: 1.15 ≤ d2s / (CT2+T23) ≤ 2.90. By limiting the inner diameter of the object side of the second spacer element, its bearing radial width with the second lens can be guaranteed, thereby ensuring the assembly stability of the second lens. Simultaneously limiting the center thickness of the second lens and the air gap between the second and third lenses on the optical axis helps prevent the center thickness of the second lens from being too large, which could lead to significant changes in the air gap between the second and third lenses on the optical axis, thus contributing to the stability of the optical performance of the optical imaging device.

[0073] In this embodiment, the inner diameter d1s of the object side of the first spacer element, the air gap T12 between the first and second lenses on the optical axis, and the inner diameter d2s of the object side of the second spacer element satisfy the following condition: 0.34 ≤ T12 / (d1s-d2s) ≤ 2.41. Constraining this condition limits the deflection angle of light at the edge of the second lens, preventing excessive deflection angles and thus avoiding the risk of high field curvature sensitivity caused by excessive light deflection angles, which helps ensure the stability of the optical performance of the optical imaging device. Simultaneously, limiting T12 and d1s and d2s effectively reduces stray light from internal reflections generated by the first lens, ensuring the imaging quality of the optical imaging device.

[0074] In this embodiment, the distance EP01 between the object side of the lens barrel and the object side of the first spacer element on the optical axis satisfies the following condition: 2.29 ≤ EP01 / CT1 ≤ 4.22. Constraining this condition ensures sufficient dispensing space between the first lens and the lens barrel, while also limiting the edge and center thickness of the first lens. This prevents unreasonable thickness ratios of the first lens from affecting its molding, thus avoiding impacts on the appearance, optical performance, and stray light quality of the optical imaging device.

[0075] In this embodiment, the inner diameter d5s of the object-side surface of the fifth spacer element and the effective focal length f5 of the fifth lens satisfy the following condition: 0.95 ≤ d5s / f5 ≤ 1.61; the inner diameter d5s of the object-side surface of the fifth spacer element and the center thickness CT5 of the fifth lens on the optical axis satisfy the following condition: 2.75 ≤ d5s / CT5 ≤ 3.18. This arrangement ensures that stray light from the edge of the effective diameter of the image-side surface of the fourth lens is effectively intercepted by the fifth spacer element, while also limiting the center thickness and effective focal length of the fifth lens. This further limits the radial dimension of the fifth lens, effectively limiting the overall volume of the optical imaging device.

[0076] In this embodiment, the distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element on the optical axis satisfies the following condition: 0.56 ≤ CT5 / EP45 ≤ 4.36. Constraining this condition ensures the edge and center thickness of the fifth lens, optimizes the overall thickness uniformity of the fifth lens, and guarantees the feasibility of its molding. Simultaneously, it ensures more design space at the edge of the fifth lens and more room for stray light reduction.

[0077] In this embodiment, the inner diameter d5m of the image-side surface of the fifth spacer element and the effective focal length f6 of the sixth lens satisfy the condition: -4.88 ≤ f6 / d5m ≤ -0.70. Constraining this condition ensures that the principal rays of each field of view of the optical imaging device effectively converge on the imaging plane, while some stray light generated by the first five lenses can be effectively intercepted by the fifth spacer element, thereby ensuring the imaging quality of the optical imaging device.

[0078] In this embodiment, the inner diameter d0m of the image-side surface of the lens barrel and the inner diameter d0s of the object-side surface of the lens barrel satisfy the following condition: 1.30 ≤ d0s / d0m ≤ 1.92. Constraining this condition ensures that the inner diameters of the image-side and object-side surfaces of the lens barrel do not obstruct the imaging light rays, guaranteeing the stable passage of the imaging light rays and thus ensuring the imaging performance of the optical imaging device. Simultaneously, it prevents excessive differences between the inner diameters of the image-side and object-side surfaces of the lens barrel, which is beneficial for ensuring assembly stability.

[0079] In this embodiment, the image-side surface of the first lens is concave; the object-side surface of the third lens is concave; the image-side surface of the fourth lens is convex; the object-side surface of the fifth lens is convex; and the object-side surface of the sixth lens is concave. By reasonably constraining the surface shape of each lens, it is beneficial to control the deflection angle of light passing through each surface, thereby controlling the light path, ensuring the stability of light transmission, and thus ensuring imaging stability. At the same time, it can effectively constrain aberrations and distortions.

[0080] In another optional embodiment of this application, an optical imaging device is provided, including a lens barrel and a lens group and a plurality of spacers disposed in the lens barrel. The lens group consists of six lenses, which are arranged sequentially from the object side to the image side along the optical axis of the optical imaging device: a first lens with negative optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power. The plurality of spacers include a first spacer positioned between the first lens and the second lens and in contact with the image side of the first lens, and a spacer positioned between the second lens and the third lens and in contact with the image side of the second lens. The second spacer element is in side contact, and the third spacer element is placed between the third and fourth lenses and in contact with the image side of the third lens; the maximum field of view (FOV) of the optical imaging device satisfies: 117.00°≤FOV≤130.00°; the inner diameter d1s of the object side of the first spacer element, the air gap T12 between the first and second lenses on the optical axis and the inner diameter d2s of the object side of the second spacer element satisfy: 0.34≤T12 / (d1s-d2s)≤2.41; the inner diameter d3m of the image side of the third spacer element and the inner diameter d2m of the image side of the second spacer element satisfy: 1.11≤d2m / d3m≤2.18.

[0081] The optical imaging device of this application consists of a lens barrel and six lenses and multiple spacer elements disposed within the lens barrel. By designing the first lens to have negative optical power, the second lens to have positive optical power, the third lens to have optical power, the fourth lens to have positive optical power, the fifth lens to have positive optical power, and the sixth lens to have negative optical power, and satisfying 117.00°≤FOV≤130.00°, it is evident that the large field-of-view light rays of the optical imaging device are deflected at excessively large angles at the front lenses, especially at the edges of the second and third lenses. This makes the lenses more sensitive to the field curvature of the external field of view, resulting in large changes in the field curvature of the optical imaging device during reliability verification and assembly, which seriously affects the performance stability of the optical imaging device. Therefore, this application, by constraining 0.34≤T12 / (d1s-d2s)≤2.41 and 1.11≤d2m / d3m≤2.18, controls the inner diameter of the image-side surfaces of the second and third spacers, thereby limiting the deflection of light at the edge of the effective optical diameter of the second and third lenses. Simultaneously, it limits the deflection angle of light at the edge of the second lens, reducing the sensitivity of the second and third lenses to field curvature. This reduces the amount of field curvature variation during reliability verification and assembly, ensuring the stability of the field curvature of the optical imaging device under high temperature and high humidity conditions, and ultimately guaranteeing the performance stability of the optical imaging device.

[0082] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0083] In addition, in another optional embodiment of the present application, an optical imaging device is further provided, which includes a lens barrel, a lens group, and a plurality of spacer elements disposed in the lens barrel. The lens group consists of six lenses. The six lenses are, in order from the object side to the image side along the optical axis of the optical imaging device, a first lens with a negative optical power, a second lens with a positive optical power, a third lens with an optical power, a fourth lens with a positive optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power. The plurality of spacer elements include a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, and a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens. The maximum field of view FOV of the optical imaging device satisfies: 117.00° ≤ FOV ≤ 130.00°. The spacing distance EP23 on the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element, the inner diameter d3m of the image side surface of the third spacer element, and the inner diameter d2m of the image side surface of the second spacer element satisfy: 0.75 < EP23 / (d2m - d3m) < 2.78.

[0084] The optical imaging device of the present application consists of a lens barrel, six lenses, and a plurality of spacer elements disposed in the lens barrel. By planning that the first lens has a negative optical power, the second lens has a positive optical power, the third lens has an optical power, the fourth lens has a positive optical power, the fifth lens has a positive optical power, and the sixth lens has a negative optical power, and satisfying 117.00° ≤ FOV ≤ 130.00°, it can be seen that the deflection angle of the large field of view light rays of the optical imaging device is too large at the edge positions of the front-end lenses, especially the second lens and the third lens. As a result, the lens is prone to be sensitive to the field curvature of the outer field of view, leading to a large change in the field curvature of the optical imaging device during reliability verification and the assembly process, seriously affecting the performance stability of the optical imaging device. Therefore, by restricting 0.75 < EP23 / (d2m - d3m) < 2.78, the ratio of the spacing distance on the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element to the difference between the inner diameter of the image side surface of the third spacer element and the inner diameter of the image side surface of the second spacer element is effectively controlled, which is beneficial to controlling the inner diameter sizes of the second spacer element and the third spacer element, thereby restricting the deflection of light rays at the edge positions of the optically effective diameter portions of the second lens and the third lens, reducing the sensitivity of the second lens and the third lens to field curvature, thereby reducing the change amount of field curvature during reliability verification and the assembly process, ensuring the stability of the front and rear field curvatures of the optical imaging device under high temperature and high humidity conditions, and further ensuring the performance stability of the optical imaging device.

[0085] Optionally, the optical imaging device may further include protective glass for protecting the photosensitive element located on the imaging surface.

[0086] The optical imaging device in this application may employ multiple lenses, such as the six lenses described above. In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0087] Figure 1 A schematic diagram showing the dimensions of an optical imaging device according to an alternative embodiment of the present invention is provided. Figure 1 The parameters d0s, d5s, d1s, d4s, d2s, d3m, d2m, and d5m are indicated to provide a clear and intuitive understanding of their meaning. To facilitate the description of the optical imaging device and the surface shape of specific lenses, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0088] The following description, with reference to the accompanying drawings, further illustrates specific surface shapes and parameters of the optical imaging device applicable to the above embodiments. It should be noted that in Embodiment 1, there are three examples: Embodiment 1-1, Embodiment 1-2, and Embodiment 1-3; in Embodiment 2, there are three examples: Embodiment 2-1, Embodiment 2-2, and Embodiment 2-3; and in Embodiment 3, there are three examples: Embodiment 3-1, Embodiment 3-2, and Embodiment 3-3. While the first to sixth lenses of the optical imaging device in the three examples within the same embodiment have the same radii of curvature, center thickness, and other parameters, as well as the inter-lens spacing and higher-order coefficients, the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel, the first spacer element, and the fifth spacer element are different.

[0089] It should be noted that any one of the examples in Embodiments 1 to 3 described below is applicable to all implementations of this application.

[0090] Example 1

[0091] like Figures 2 to 7 As shown, the optical imaging device of Embodiment 1 is described. Figure 2 A schematic diagram of the optical imaging device of Embodiment 1-1 is shown. Figure 3 A schematic diagram of the optical imaging device of Embodiments 1-2 is shown. Figure 4 A schematic diagram of the optical imaging device of Embodiments 1-3 is shown.

[0092] like Figures 2 to 4 As shown, the optical imaging device includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, a fifth lens E5, a fifth spacer P5, and a sixth lens E6 arranged sequentially from the object side to the image side along the optical axis of the optical imaging device in the lens barrel P0.

[0093] like Figure 2 The diagram shows a schematic representation of the optical imaging device in Embodiment 1-1. In this example, the object-side and image-side of the first spacer element P1 are in contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer element P2 are in contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer element P3 are in contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively. The object-side and image-side of the fourth spacer element P4 are in contact with the image-side S8 of the fourth lens and the object-side of the fourth auxiliary spacer element P4b, respectively. The image-side of the fourth auxiliary spacer element P4b is in contact with the object-side S9 of the fifth lens. The object-side and image-side of the fifth spacer element P5 are in contact with the image-side S10 of the fifth lens and the object-side S11 of the sixth lens, respectively.

[0094] like Figure 3 The diagram shown is a structural schematic of the optical imaging device of Embodiments 1-2. In this example, the contact method of each spacer element is the same as that of Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0095] like Figure 4 The diagram shown is a schematic representation of the optical imaging device according to Embodiments 1-3. In this example, the contact method of each spacer element is the same as that in Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0096] In summary, the structural parameters of the optical imaging device of Embodiment 1 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 2 (unit: millimeters mm).

[0097] Table 2

[0098] Parameters / Examples 1-1 1-2 1-3 d1s 2.2844 2.2654 2.2329 d2s 1.6316 1.6206 1.6231 d2m 1.6036 1.6206 1.6231 d3m 1.2857 1.2834 1.3281 D3m 3.8520 4.1200 5.0572 d4s 1.9450 1.8987 1.9153 d4m 2.7246 2.6811 1.9153 d5s 2.4657 2.4755 2.4611 d5m 2.4657 2.4755 2.4611 d0s 5.3076 4.7591 5.8646 d0m 3.7367 3.6213 3.3863 EP01 0.8131 0.7573 1.0196 EP23 0.6582 0.6597 0.6660 CP4 0.6584 0.5826 0.0220 CP4b 0.0220 0.0160 0.6394 EP45 0.2056 0.2838 0.8967

[0099] In Embodiment 1, the first lens E1 has negative optical power, and both its object-side surface S1 and image-side surface S2 are concave. The second lens E2 has positive optical power, and both its object-side surface S3 and image-side surface S4 are concave. The third lens E3 has positive optical power, and both its object-side surface S5 and image-side surface S6 are convex. The fourth lens E4 has positive optical power, and both its object-side surface S7 and image-side surface S8 are convex. The fifth lens E5 has positive optical power, and both its object-side surface S9 and image-side surface S10 are convex. The sixth lens E6 has negative optical power, and both its object-side surface S11 and image-side surface S12 are convex.

[0100] In Embodiment 1, the maximum field of view (FOV) of the optical imaging device is 123.50°, the effective focal length (f) of the optical imaging device is 1.90 mm, the effective focal length (f1) of the first lens is -2.07 mm, the effective focal length (f2) of the second lens is 6.53 mm, the effective focal length (f3) of the third lens is 3.33 mm, the effective focal length (f4) of the fourth lens is 7.97 mm, the effective focal length (f5) of the fifth lens is 1.54 mm, and the effective focal length (f6) of the sixth lens is -1.74 mm.

[0101] Table 3 shows the basic structural parameters of the optical imaging device in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, located between the third lens E3 and the fourth lens E4. S13 and S14 (not shown in the figure) can be the object-side side and image-side side of the filter, or the object-side side and image-side side of the protective glass.

[0102] Table 3

[0103]

[0104] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the sixth lens E6 are both aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0105]

[0106] 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 3 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S1-S12 in Example 1.

[0107] Table 4

[0108]

[0109]

[0110] Figure 5 The on-axis chromatic aberration curve of the optical imaging device of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 6 The astigmatism curves of the optical imaging device of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7 The magnification chromatic aberration curve of the optical imaging device of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the optical imaging device.

[0111] according to Figures 5 to 7 As can be seen, the optical imaging device given in Example 1 can achieve good imaging quality.

[0112] Example 2

[0113] like Figures 8 to 13 As shown, the optical imaging device of Embodiment 2 is described. Figure 8 A schematic diagram of the optical imaging device of Embodiment 2-1 is shown. Figure 9 A schematic diagram of the optical imaging device of Embodiment 2-2 is shown. Figure 10 A schematic diagram of the optical imaging device of Embodiments 2-3 is shown.

[0114] like Figures 8 to 10 As shown, the optical imaging device includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, and a sixth lens E6 arranged sequentially from the object side to the image side along the optical axis of the optical imaging device in the lens barrel P0.

[0115] like Figure 8The diagram shows a schematic of the optical imaging device according to Embodiment 2-1. In this example, a second auxiliary spacer element P2b is further provided on the image side of the second spacer element P2, and a fourth auxiliary spacer element P4b is further provided on the image side of the fourth spacer element P4. The object side and image side of the first spacer element P1 are in contact with the image side S2 of the first lens and the object side S3 of the second lens, respectively. The object side and image side of the second spacer element P2 are in contact with the image side S4 of the second lens and the object side of the second auxiliary spacer element P2b, respectively. The image side of the second auxiliary spacer element P2b is in contact with the object side S5 of the third lens. The object side and image side of the third spacer element P3 are in contact with the image side S6 of the third lens and the object side S7 of the fourth lens, respectively. The object side and image side of the fourth spacer element P4 are in contact with the image side S8 of the fourth lens and the object side of the fourth auxiliary spacer element P4b, respectively. The image side of the fourth auxiliary spacer element P4b is in contact with the object side S9 of the fifth lens. The object-side and image-side surfaces of the fifth spacer element P5 are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively.

[0116] like Figure 9 The diagram shown is a schematic representation of the optical imaging device in Embodiment 2-2. The difference between this example and Embodiment 2-1 is that the image side of the second spacer element P2 does not have a second auxiliary spacer element P2b. In this case, the object side and image side of the second spacer element P2 are in contact with the image side S4 of the second lens and the object side S5 of the third lens, respectively. The contact methods of the remaining spacer elements are the same as in Embodiment 2-1, and can be found in the relevant description in Embodiment 2-1, which will not be repeated here.

[0117] like Figure 10 The diagram shown is a schematic representation of the optical imaging device in Embodiment 2-3. The difference between this example and Embodiment 2-1 is that the image side of the fourth spacer element P4 does not have a fourth auxiliary spacer element P4b. In this case, the object side and image side of the fourth spacer element P4 are in contact with the image side S8 of the fourth lens and the object side S9 of the fifth lens, respectively. The contact methods of the remaining spacer elements are the same as in Embodiment 2-1, and can be found in the relevant description in Embodiment 2-1, which will not be repeated here.

[0118] In summary, the structural parameters of the optical imaging device of Embodiment 2 under Embodiments 2-1, 2-2, and 2-3 are shown in Table 5 (unit: millimeters mm).

[0119] Table 5

[0120] Parameters / Examples 2-1 2-2 2-3 d1s 2.6742 2.7235 2.6878 d2s 2.4478 1.6017 2.0644 d2m 1.4827 1.5617 2.0644 d3m 0.9088 0.9479 0.9465 D3m 4.3761 4.0563 4.5878 d4s 1.5755 1.5776 2.4689 d4m 2.4414 2.7193 2.5892 d5s 2.5777 2.5596 2.5892 d5m 2.5777 2.5596 2.5892 d0s 6.8111 6.4326 6.5274 d0m 3.6293 3.5423 3.4014 EP01 1.3944 1.5104 1.5627 EP23 0.5250 0.6661 0.8957 CP4 0.9343 1.1300 1.1179 CP4b 0.0220 0.0220 EP45 0.4124 0.2785 0.2501

[0121] In Embodiment 2, the first lens E1 has negative optical power, its object-side surface S1 is concave, and its image-side surface S2 is concave. The second lens E2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has negative optical power, its object-side surface S5 is concave, and its image-side surface S6 is concave. The fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fifth lens E5 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is convex. The sixth lens E6 has negative optical power, its object-side surface S11 is concave, and its image-side surface S12 is convex.

[0122] In Embodiment 2, the maximum field of view (FOV) of the optical imaging device is 130.00°, the effective focal length (f) of the optical imaging device is 1.29 mm, the effective focal length (f1) of the first lens is -1.79 mm, the effective focal length (f2) of the second lens is 2.84 mm, the effective focal length (f3) of the third lens is -4.47 mm, the effective focal length (f4) of the fourth lens is 2.01 mm, the effective focal length (f5) of the fifth lens is 2.70 mm, and the effective focal length (f6) of the sixth lens is -12.48 mm.

[0123] Table 6 shows the basic structural parameters of the optical imaging device in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, located between the third lens E3 and the fourth lens E4. S13 and S14 (not shown in the figure) can be the object-side side and image-side side of the filter, or the object-side side and image-side side of the protective glass.

[0124] Table 6

[0125]

[0126] Table 7 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S1-S12 in Example 2.

[0127] Table 7

[0128] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.8478E-01 -1.2460E-01 6.0624E-02 -1.9831E-02 4.1248E-03 -4.9883E-04 2.6869E-05 0.0000E+00 0.0000E+00 S2 -6.5166E-02 3.4238E-01 -5.0313E-01 4.3268E-01 -1.9801E-01 4.2748E-02 -3.9001E-03 2.5379E-04 0.0000E+00 S3 -2.1568E-01 3.5999E-01 -3.9444E-01 2.9599E-01 -1.4072E-01 3.7271E-02 -4.0539E-03 0.0000E+00 0.0000E+00 S4 -6.4498E-02 2.4383E-01 -4.2397E-01 3.9251E-01 -2.0245E-01 5.4844E-02 -6.0698E-03 0.0000E+00 0.0000E+00 S5 2.1938E-02 1.4320E-01 -2.5289E+00 1.0193E+01 -2.1353E+01 2.2044E+01 -8.9930E+00 0.0000E+00 0.0000E+00 S6 1.2088E-01 -6.9614E-01 3.8289E+00 -1.2650E+01 2.2433E+01 -2.0514E+01 7.5447E+00 0.0000E+00 0.0000E+00 S7 -4.9479E-02 -1.5322E-01 4.5389E-01 6.2550E-02 -1.8847E+00 2.7894E+00 -1.3229E+00 0.0000E+00 0.0000E+00 S8 -9.0392E-02 -1.4093E-01 9.7793E-01 -3.4296E+00 6.8069E+00 -6.7815E+00 2.6311E+00 0.0000E+00 0.0000E+00 S9 -1.4476E-01 3.1141E-01 -4.8587E-01 4.1285E-01 -1.9744E-01 4.9691E-02 -5.0607E-03 0.0000E+00 0.0000E+00 S10 -6.4940E-01 1.5803E+00 -1.9216E+00 1.2618E+00 -4.5695E-01 8.3513E-02 -5.5684E-03 0.0000E+00 0.0000E+00 S11 -5.9005E-01 9.8696E-01 -8.6166E-01 5.1649E-01 -2.4254E-01 7.8122E-02 -1.1408E-02 0.0000E+00 0.0000E+00 S12 6.0354E-01 -1.2873E+00 1.3822E+00 -8.3356E-01 2.9049E-01 -5.4940E-02 4.3830E-03 0.0000E+00 0.0000E+00

[0129] Figure 11 The on-axis chromatic aberration curve of the optical imaging device of Embodiment 2 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 12 The astigmatism curves of the optical imaging device of Embodiment 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 13 The magnification chromatic aberration curve of the optical imaging device of Embodiment 2 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the optical imaging device.

[0130] according to Figures 11 to 13 It can be seen that the optical imaging device given in Embodiment 2 can achieve good imaging quality.

[0131] Example 3

[0132] like Figures 14 to 19 As shown, the optical imaging device of Embodiment 3 is described. Figure 14 A schematic diagram of the optical imaging device of Embodiment 3-1 is shown. Figure 15 A schematic diagram of the optical imaging device of Embodiment 3-2 is shown. Figure 16 A schematic diagram of the optical imaging device of Embodiment 3-3 is shown.

[0133] like Figures 14 to 16 As shown, the optical imaging device includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, a fifth lens E5, a fifth spacer P5, and a sixth lens E6 arranged sequentially from the object side to the image side along the optical axis of the optical imaging device in the lens barrel P0.

[0134] like Figure 14 The diagram shows a schematic of the optical imaging device according to Embodiment 3-1. In this example, the object-side and image-side of the first spacer element P1 are in contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer element P2 are in contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer element P3 are in contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively. The object-side and image-side of the fourth spacer element P4 are in contact with the image-side S8 of the fourth lens and the object-side of the fourth auxiliary spacer element P4b, respectively. The image-side of the fourth auxiliary spacer element P4b is in contact with the object-side S9 of the fifth lens. The object-side and image-side of the fifth spacer element P5 are in contact with the image-side S10 of the fifth lens and the object-side S11 of the sixth lens, respectively.

[0135] like Figure 15The diagram shown is a schematic representation of the optical imaging device in Embodiment 3-2. The difference between this example and Embodiment 3-1 is that a third auxiliary spacer element P3b is also provided on the image side of the third spacer element P3. In this case, the object side and image side of the third auxiliary spacer element P3b contact the image side of the third spacer element P3 and the object side S7 of the fourth lens, respectively. The contact methods of the remaining spacer elements are the same as in Embodiment 3-1, and can be found in the relevant description in Embodiment 3-1, which will not be repeated here.

[0136] like Figure 16 The diagram shown is a schematic representation of the optical imaging device of Embodiment 3-3. In this example, the contact method of each spacer element is the same as that of Embodiment 3-1, and can be referred to the relevant description in Embodiment 3-1, which will not be repeated here.

[0137] In summary, the structural parameters of the optical imaging device of Embodiment 3 under Embodiments 3-1, 3-2, and 3-3 are shown in Table 8 (unit: mm).

[0138] Table 8

[0139]

[0140]

[0141] In Embodiment 3, the first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has positive optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens E3 has negative optical power, its object-side surface S5 is concave, and its image-side surface S6 is convex. The fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fifth lens E5 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is convex. The sixth lens E6 has negative optical power, its object-side surface S11 is concave, and its image-side surface S12 is concave.

[0142] In Embodiment 3, the maximum field of view (FOV) of the optical imaging device is 117.00°, the effective focal length (f) of the optical imaging device is 1.88 mm, the effective focal length (f1) of the first lens is -3.38 mm, the effective focal length (f2) of the second lens is 2.35 mm, the effective focal length (f3) of the third lens is -2.40 mm, the effective focal length (f4) of the fourth lens is 2.69 mm, the effective focal length (f5) of the fifth lens is 2.49 mm, and the effective focal length (f6) of the sixth lens is -2.09 mm.

[0143] Table 9 shows the basic structural parameters of the optical imaging device in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, located between the third lens E3 and the fourth lens E4. S13 and S14 (not shown in the figure) can be the object-side side and image-side side of the filter, or the object-side side and image-side side of the protective glass.

[0144] Table 9

[0145]

[0146] Table 10 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S1-S12 in Example 3.

[0147] Table 10

[0148] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 4.9377E-02 -1.7418E-01 1.3843E-01 -5.8217E-02 1.4476E-02 -2.0211E-03 1.2440E-04 0.0000E+00 0.0000E+00 S2 1.6525E-01 -2.9284E-01 2.2642E-01 -3.3430E-01 4.3243E-01 -2.6857E-01 6.4264E-02 0.0000E+00 0.0000E+00 S3 -2.7213E-02 -5.0546E-02 -5.6581E-03 -2.7920E-03 6.5457E-02 -5.5778E-02 1.3973E-02 0.0000E+00 0.0000E+00 S4 4.3093E-01 -1.2455E+00 3.5593E+00 -7.4049E+00 9.5701E+00 -6.8273E+00 2.0594E+00 0.0000E+00 0.0000E+00 S5 8.2653E-01 -2.3365E+00 7.5887E+00 -1.8100E+01 2.5714E+01 -1.9813E+01 6.3559E+00 0.0000E+00 0.0000E+00 S6 2.7157E-01 -4.3794E-01 3.0908E+00 -1.0683E+01 1.8615E+01 -1.6984E+01 6.3731E+00 0.0000E+00 0.0000E+00 S7 -1.5606E-01 5.6730E-01 -8.5855E-02 -2.8951E+00 7.7883E+00 -8.9822E+00 4.1010E+00 0.0000E+00 0.0000E+00 S8 -1.1246E-01 5.9274E-02 2.7864E-01 -1.2538E+00 2.7529E+00 -2.9358E+00 1.3445E+00 0.0000E+00 0.0000E+00 S9 -3.0728E-02 4.1650E-02 -6.3058E-02 7.4534E-02 -5.2542E-02 1.7699E-02 -3.3260E-04 -9.9045E-04 0.0000E+00 S10 -2.3243E-03 3.5307E-02 -4.5109E-02 4.8459E-02 -3.1308E-02 1.2397E-02 -2.2820E-03 0.0000E+00 0.0000E+00 S11 -4.5190E-01 2.9827E-01 -2.1249E-01 3.0145E-01 -2.7992E-01 1.5617E-01 -6.1758E-02 1.7771E-02 -2.5828E-03 S12 -3.5119E-01 2.9275E-01 -1.9964E-01 1.1046E-01 -3.9695E-02 7.8304E-03 -6.4210E-04 0.0000E+00 0.0000E+00

[0149] Figure 17 The on-axis chromatic aberration curve of the optical imaging device of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 18 The astigmatism curves of the optical imaging device of Embodiment 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 19 The magnification chromatic aberration curve of the optical imaging device of Embodiment 3 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the optical imaging device.

[0150] according to Figures 17 to 19 It can be seen that the optical imaging device given in Embodiment 3 can achieve good imaging quality.

[0151] In summary, Examples 1 to 3 satisfy the relationships shown in Table 11.

[0152] Table 11

[0153] Conditional / Example 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 d3m / CT3 2.24 2.24 2.32 2.16 2.25 2.25 6.43 6.24 6.43 d2m / d3m 1.25 1.26 1.22 1.63 1.65 2.18 1.11 1.17 1.14 EP23 / CT3 1.15 1.15 1.16 1.25 1.58 2.13 1.89 1.83 1.87 (D3m-d3m) / CT4 3.03 3.35 4.40 9.00 8.07 9.45 7.82 9.00 6.43 f4 / d4s 4.10 4.20 4.16 1.28 1.27 0.81 1.65 1.64 1.37 d2s / (CT2+T23) 2.90 2.88 2.89 1.88 1.23 1.59 1.15 1.15 1.16 R5 / d2m -3.07 -3.04 -3.03 -2.58 -2.45 -1.85 -0.83 -0.80 -0.80 f3 / d2m 2.08 2.06 2.05 -3.01 -2.86 -2.16 -1.53 -1.49 -1.48 d4m / (T45+CT5) 2.88 2.84 2.03 1.51 1.69 1.60 0.97 0.97 1.57 (CP4+CP4b) / T45 13.61 11.97 13.23 1.20 1.44 1.33 1.38 1.42 EP23 / T23 1.93 1.93 1.95 1.07 1.36 1.82 6.09 5.89 6.04 T12 / (d1s-d2s) 0.34 0.35 0.37 2.41 0.49 0.88 1.39 1.36 1.36 EP01 / CT1 2.46 2.29 3.08 3.44 3.73 3.86 3.89 4.22 3.97 d0s / d0m 1.42 1.31 1.73 1.88 1.82 1.92 1.48 1.84 1.30 d5s / f5 1.61 1.61 1.60 0.95 0.95 0.96 1.01 1.02 1.02 d5s / CT5 2.75 2.76 2.75 3.17 3.14 3.18 2.90 2.92 2.92 CT5 / EP45 4.36 3.16 1.00 1.97 2.92 3.25 0.56 0.56 2.72 f6 / d5m -0.71 -0.70 -0.71 -4.84 -4.88 -4.82 -0.83 -0.82 -0.83

[0154] Table 12 shows the effective focal length of the optical imaging device in Examples 1 to 3, the effective focal length of each lens, and the maximum field of view (FOV) of the optical imaging device.

[0155] Table 12

[0156] Basic Data / Example one two three FOV (°) 123.50 130.00 117.00 f(mm) 1.90 1.29 1.88 f1(mm) -2.07 -1.79 -3.38 f2 (mm) 6.53 2.84 2.35 f3 (mm) 3.33 -4.47 -2.40 f4 (mm) 7.97 2.01 2.69 f5 (mm) 1.54 2.70 2.49 f6 (mm) -1.74 -12.48 -2.09

[0157] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging device described above.

[0158] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0159] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0160] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0161] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical imaging device, characterized in that, It includes a lens barrel and a lens assembly and multiple spacer elements disposed within the lens barrel. The lens group consists of six lenses, which are arranged sequentially from the object side to the image side along the optical axis of the optical imaging device as follows: a first lens with negative optical power, a second lens with positive optical power, a third lens with optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power. The plurality of spacers include a second spacer element placed between the second lens and the third lens and in contact with the image side of the second lens, and a third spacer element placed between the third lens and the fourth lens and in contact with the image side of the third lens; The maximum field of view (FOV) of the optical imaging device satisfies: 117.00°≤FOV≤130.00°; the inner diameter d3m of the image side of the third spacer element and the center thickness CT3 of the third lens on the optical axis satisfy: 2.16≤d3m / CT3≤6.43; the inner diameter d3m of the image side of the third spacer element and the inner diameter d2m of the image side of the second spacer element satisfy: 1.11≤d2m / d3m≤2.

18.

2. The optical imaging device according to claim 1, characterized in that, The inner diameter d3m of the image side of the third spacer element, the center thickness CT4 of the fourth lens on the optical axis, and the outer diameter D3m of the image side of the third spacer element satisfy the following condition: 3.03≤(D3m-d3m) / CT4≤9.

45.

3. The optical imaging device according to claim 1, characterized in that, The distance EP23 between the image side of the second spacer element and the object side of the third spacer element on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy the following: 1.15≤EP23 / CT3≤2.

13.

4. The optical imaging device according to claim 1, characterized in that, The radius of curvature R5 of the object-side surface of the third lens and the inner diameter d2m of the image-side surface of the second spacer element satisfy the following relationship: -3.07 ≤ R5 / d2m ≤ -0.80; the effective focal length f3 of the third lens and the inner diameter d2m of the image-side surface of the second spacer element satisfy the following relationship: -3.01≤f3 / d2m≤2.

08.

5. The optical imaging device according to claim 1, characterized in that, The plurality of spacers also 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 effective focal length f4 of the fourth lens and the inner diameter d4s of the object side of the fourth spacer element satisfy the following condition: 0.81≤f4 / d4s≤4.

20.

6. The optical imaging device according to claim 1, characterized in that, The plurality of spacers also 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 inner diameter d4m of the image side of the fourth spacer element, the air gap T45 between the fourth and fifth lenses on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis satisfy the following: 0.97≤d4m / (T45+CT5)≤2.

88.

7. The optical imaging device according to claim 1, characterized in that, The plurality of spacers also 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 fourth auxiliary spacer element disposed between the fourth spacer element and the fifth lens and in contact with the image-side surface of the fourth spacer element. The air gap T45 between the fourth lens and the fifth lens on the optical axis, the maximum axial thickness CP4 of the fourth spacer element, and the maximum axial thickness CP4b of the fourth auxiliary spacer element satisfy the following condition: 1.20≤(CP4+CP4b) / T45≤13.

61.

8. The optical imaging device according to claim 1, characterized in that, The distance EP23 between the image side of the second spacer element and the object side of the third spacer element on the optical axis and the air gap T23 between the second lens and the third lens on the optical axis satisfy the following: 1.07≤EP23 / T23≤6.

09.

9. The optical imaging device according to claim 1, characterized in that, The inner diameter d2s of the object side of the second spacer element, the center thickness CT2 of the second lens on the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis satisfy the following: 1.15≤d2s / (CT2+T23)≤2.

90.

10. The optical imaging device according to claim 1, characterized in that, The plurality of spacers also 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 inner diameter d1s of the object side of the first spacer element, the air gap T12 between the first lens and the second lens on the optical axis and the inner diameter d2s of the object side of the second spacer element satisfy the following: 0.34≤T12 / (d1s-d2s)≤2.41.

Images