Optical imaging device

Abstract

The utility model relates to an optical imaging device, comprising a lens cone assembly comprising a first lens cone and a second lens cone arranged in sequence, and a lens assembly comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; the first lens, the second lens and the third lens are arranged in the first lens barrel, and the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are arranged in the second lens barrel; the optical imaging device satisfies the following relational expressions: 1.3 < fno < 1.4; the Semi-FOV is more than 66 degrees and less than 70 degrees; 1.1 < d01s / DT11 < 1.5; d02m / DT82 is more than 1.0 and less than 1.2; according to the optical imaging device, by accurately controlling the proportion of the clear apertures of the first lens and the eighth lens to the inner diameters of the lens cones, uniform distribution of light rays when the light rays pass through the lens is ensured, the problem of relative illumination in an ultra-wide-angle large-aperture double-lens-cone combined lens is effectively solved, and therefore the overall quality of imaging is improved.

Description

Technical Field

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

[0002] With the widespread use of smartphones, tablets, and other portable devices, the performance requirements for optical lens systems are constantly increasing. Currently, some large-aperture lenses often result in higher brightness in the center of the image and lower brightness in the edge areas. This phenomenon is particularly noticeable in ultra-wide-angle lenses because the wider field of view means that light is more scattered and absorbed as it passes through the edges of the lens, leading to decreased edge brightness. Furthermore, due to the extremely wide field of view of ultra-wide-angle lenses, light may encounter more obstruction at the edges, resulting in vignetting, which makes the corners or edges of the image appear darker, creating uneven brightness. This, in turn, affects the overall brightness balance and visual effect of the image. Moreover, the manufacturing difficulty of such large-aperture and wide-field-of-view lenses is significantly increased. Utility Model Content

[0003] Therefore, it is necessary to provide an optical imaging device to address the problem of uneven brightness in existing large-aperture and wide-angle lenses.

[0004] An optical imaging device, comprising:

[0005] The lens barrel assembly includes a first lens barrel and a second lens barrel arranged sequentially, wherein the inner circumferential surface of the first lens barrel and the inner circumferential surface of the second lens barrel are both stepped.

[0006] A lens assembly comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having a positive optical power, arranged sequentially along the optical axis from the object side to the image side; the first lens, the second lens, and the third lens are disposed within a first lens barrel, and the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are disposed within a second lens barrel;

[0007] The optical imaging device satisfies the following relationship:

[0008] 1.3 < fno < 1.4;

[0009] 66° < Semi-FOV < 70°;

[0010] 1.1 < d01s / DT11 < 1.5;

[0011] 1.0 < d02m / DT82 < 1.2;

[0012] Wherein, Semi-FOV is the maximum half field of view of the optical imaging device, fno is the numerical aperture of the optical imaging device, d01s is the inner diameter of the object side of the first lens barrel, d02m is the inner diameter of the image side of the second lens barrel, DT11 is the effective diameter of the light-transmitting part of the object side of the first lens, and DT82 is the effective diameter of the light-transmitting part of the image side of the eighth lens.

[0013] In one embodiment, the image side of the first lens barrel is engaged with the object side of the second lens barrel, and the first lens barrel and the second lens barrel satisfy the following relationship:

[0014] L1 + L2 > L;

[0015] Wherein, L1 is the maximum height of the first lens barrel, L2 is the maximum height of the second lens barrel, and L is the overall maximum height of the lens barrel assembly.

[0016] In one embodiment, the image side of the first lens barrel is chamfered, and the third lens and the second lens barrel rest against the chamfer of the first lens.

[0017] In one embodiment, at least half of the first to eighth lenses are glass lenses.

[0018] In one embodiment, the refractive indices of the fourth to eighth lenses within the second lens barrel are arranged sequentially as low refractive index, high refractive index, low refractive index, high refractive index, and high refractive index.

[0019] In one embodiment, the optical imaging device satisfies the following relationship:

[0020] 0.5≤(D02s-d02s) / DT41<1;

[0021] Wherein, DT41 is the effective diameter of the light-transmitting part on the side of the fourth lens, D02s is the outer diameter of the side of the lens barrel, and d02s is the inner diameter of the side of the lens barrel.

[0022] In one embodiment, the optical imaging device further includes a fourth spacer element disposed between the fourth lens and the fifth lens, wherein the object-side surface of the fourth spacer element is at least partially in contact with the image-side surface of the fourth lens; the optical imaging device satisfies the following relationship:

[0023] 0.55 < d02s / R7 ≤ 0.80;

[0024] -1.25 < d4s / R8 < -0.55;

[0025] Wherein, d02s is the inner diameter of the object side of the second lens barrel, d4s is the inner diameter of the object side of the fourth spacer element, R8 is the radius of curvature of the image side of the fourth lens, and R7 is the radius of curvature of the object side of the fourth lens.

[0026] In one embodiment, the optical imaging device satisfies the following relationship:

[0027] 0.60 < d4s / f4 < 1.10;

[0028] -0.95 < d4m / f5 ≤ -0.45;

[0029] Wherein, d4s is the object-side inner diameter of the fourth spacer element, d4m is the image-side inner diameter of the fourth spacer element, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

[0030] In one embodiment, the optical imaging device further includes a fifth spacer element disposed between the fifth lens and the sixth lens, wherein the object-side surface of the fifth spacer element is at least partially in contact with the image-side surface of the fifth lens; the optical imaging device satisfies the following relationship:

[0031] 0.2<(D5s-D4s) / EP45<2.55;

[0032] Wherein, D4s is the object-side outer diameter of the fourth spacer element, D5s is the object-side outer diameter of the fifth spacer element, and EP45 is the axial distance from the image-side surface of the fourth spacer element to the object-side surface of the fifth spacer element.

[0033] In one embodiment, the optical imaging device satisfies the following relationship:

[0034] -1.15≤d5s / f5<-0.6;

[0035] 0.95≤d5m / f6<1.5;

[0036] Wherein, d5s is the object-side inner diameter of the fifth spacer element, d5m is the image-side inner diameter of the fifth spacer element, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.

[0037] In one embodiment, the optical imaging device further includes a sixth spacer element, a sixth front auxiliary spacer element, and a sixth rear auxiliary spacer element arranged sequentially from the object side to the image side. The sixth spacer element, the sixth front auxiliary spacer element, and the sixth rear auxiliary spacer element are all disposed between the sixth lens and the seventh lens, and the object side of the sixth spacer element at least partially contacts the image side of the sixth lens; the object side of the sixth front auxiliary spacer element at least partially contacts the image side of the sixth spacer element, and the object side of the sixth rear auxiliary spacer element at least partially contacts the image side of the sixth front auxiliary spacer element; the optical imaging device satisfies the following relationship:

[0038] 0.1≤(CP6+CP6b+CP6c) / |R12+R13|<1.5;

[0039] Wherein, CP6 is the center thickness of the sixth spacer element, CP6b is the center thickness of the sixth front auxiliary spacer element, CP6c is the center thickness of the sixth rear auxiliary spacer element, R12 is the radius of curvature of the image side of the sixth lens, and R13 is the radius of curvature of the object side of the seventh lens.

[0040] In one embodiment, the optical imaging device satisfies the following relationship:

[0041] 0.5<(d6cm-d6s) / (DT71-DT62)<1.05;

[0042] Wherein, d6s is the object-side inner diameter of the sixth spacer element, d6cm is the image-side inner diameter of the sixth rear auxiliary spacer element, DT62 is the effective diameter of the image-side light-transmitting portion of the sixth lens, and DT71 is the effective diameter of the object-side light-transmitting portion of the seventh lens.

[0043] In one embodiment, the optical imaging device further includes a seventh spacer element disposed between the seventh lens and the eighth lens, wherein the object-side surface of the seventh spacer element is at least partially in contact with the image-side surface of the seventh lens; the optical imaging device satisfies the following relationship:

[0044] 0.2 < d7s / (f8-f7) ≤ 1.25;

[0045] Wherein, d6s is the object-side inner diameter of the sixth spacer element, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens.

[0046] The optical imaging device of this application features a large aperture, a wide field of view, and high performance, and achieves high assembly precision and yield through a dual-lens combination. However, due to the large aperture, the brightness of the central area of ​​the image is higher, while the brightness of the edge area is lower. The wide field of view of the optical imaging device means that light passing through its edges experiences more scattering and absorption, resulting in decreased edge brightness. Furthermore, because the optical imaging device has a very wide field of view, light passing through its edges may encounter more obstruction, producing a vignetting effect. This causes the corners or edges of the image to appear darker, creating a non-uniform brightness phenomenon, which in turn affects the overall brightness balance and visual effect of the image, significantly increasing the manufacturing difficulty of the optical imaging device. Therefore, the optical imaging device of this application achieves uniform light distribution by precisely controlling the ratio of the aperture of the first lens and the eighth lens to the corresponding inner diameter of the lens barrel. Based on the above relationships, by limiting the ranges of d01s / DT11 and d02m / DT82, the uniformity of light passing through the lens can be ensured, thereby significantly reducing edge brightness reduction and vignetting. When d01s / DT11 < 1.1 and d02m / DT82 < 1.0, the apertures of the first and second lenses are too large relative to the lens inner diameter, causing excessive light to enter the lens edge area, resulting in severe flare and scattering phenomena, reducing image contrast and sharpness. Simultaneously, the excessive concentration of light in the edge area increases the brightness difference between the center and edge areas, exacerbating the vignetting effect. Conversely, when d01s / DT11 > 1.5 and d02m / DT82 > 1.2, the apertures of the first and eighth lenses are too small relative to the lens barrel inner diameter, resulting in insufficient light in the edge area, making the image edges dark and also producing vignetting. Furthermore, a smaller aperture also limits the lens's resolution and sharpness, affecting overall image quality. Therefore, the optical imaging device of this application ensures the uniform distribution of light when passing through the lens by precisely controlling the ratio of the light-transmitting aperture of the first lens and the inner diameter of the lens barrel, effectively solving the relative illumination problem in the ultra-wide-angle large aperture dual-lens combination lens, thereby improving the overall imaging quality. Attached Figure Description

[0047] Figure 1 A schematic diagram showing the dimensions of an optical imaging device according to an alternative embodiment of the present invention is provided.

[0048] Figure 2A A schematic diagram of the structure of an optical imaging device provided in a first example of a first embodiment of the present invention is shown;

[0049] Figure 2BA schematic diagram of the structure of an optical imaging device provided in a second example of the first embodiment of the present invention is shown;

[0050] Figure 2C A schematic diagram of the structure of an optical imaging device provided in a third example of the first embodiment of the present invention is shown;

[0051] Figure 3A An on-axis chromatic aberration curve of the optical imaging device according to the first embodiment of the present invention is shown;

[0052] Figure 3B An astigmatism curve diagram of the optical imaging device according to the first embodiment of the present invention is shown;

[0053] Figure 3C The distortion curve of the optical imaging device according to the first embodiment of the present invention is shown;

[0054] Figure 4A A schematic diagram of the structure of the optical imaging device provided in the fourth example of the second embodiment of the present invention is shown;

[0055] Figure 4B A schematic diagram of the structure of the optical imaging device provided in the fifth example of the second embodiment of the present invention is shown;

[0056] Figure 4C A schematic diagram of the structure of an optical imaging device provided in the sixth example of the second embodiment of the present invention is shown;

[0057] Figure 5A An on-axis chromatic aberration curve of the optical imaging device according to a second embodiment of the present invention is shown;

[0058] Figure 5B An astigmatism curve diagram of the optical imaging device according to a second embodiment of the present invention is shown;

[0059] Figure 5C The distortion curve of the optical imaging device according to the second embodiment of the present invention is shown;

[0060] Figure 6A A schematic diagram of the structure of an optical imaging device provided in the seventh example of the third embodiment of the present invention is shown;

[0061] Figure 6B A schematic diagram of the structure of an optical imaging device provided in the eighth example of the third embodiment of the present invention is shown;

[0062] Figure 6C A schematic diagram of the structure of an optical imaging device provided in the ninth example of the third embodiment of the present invention is shown;

[0063] Figure 7AAn on-axis chromatic aberration curve of the optical imaging device according to the third embodiment of the present invention is shown;

[0064] Figure 7B An astigmatism curve diagram of the optical imaging device according to the third embodiment of the present invention is shown;

[0065] Figure 7C The distortion curve of the optical imaging device according to the third embodiment of the present invention is shown;

[0066] Figure 8A The relative illumination curves of an optional embodiment of the optical imaging device of this utility model are shown when fno = 1.338, Semi-FOV = 70°, d01s / DT11 = 1.18 and d02m / DT82 = 1.14.

[0067] Figure 8B The relative illumination curve of an optical imaging device according to an optional embodiment of the present invention is shown when the relation fno = 1.338, Semi-FOV = 70°, d01s / DT11 = 1 and d02m / DT82 = 0.9 is presented.

[0068] Figure 8C The relative illumination curve of an optical imaging device according to an optional embodiment of the present invention is shown when the relation fno = 1.338, Semi-FOV = 70°, d01s / DT11 = 1.6 and d02m / DT82 = 1.3 is presented.

[0069] Reference numerals: P01, first lens barrel; P02, second lens barrel; E1, first lens; E2, second lens; E3, third lens; E4, fourth lens; E5, fifth lens; E6, sixth lens; E7, seventh lens; E8, eighth lens; P1, first spacer element; P2, second spacer element; P2b, second auxiliary spacer element; P4, fourth spacer element; P5, fifth spacer element; P6, sixth spacer element; P6b, sixth front auxiliary spacer element; P6c, sixth rear auxiliary spacer element; P7, seventh spacer element. Detailed Implementation

[0070] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0071] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0074] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0076] Addressing the issue of uneven brightness in existing large-aperture and wide-field-of-view lenses, this application provides an optical imaging device. This device features a large aperture, wide field of view, and high performance. Furthermore, it achieves high assembly precision and yield through a dual-lens combination. By precisely controlling the ratio of the aperture of the first and eighth lenses to the inner diameter of the lens barrel, it ensures uniform light distribution as light passes through the lens, effectively solving the relative illumination problem in ultra-wide-angle, large-aperture dual-lens combination lenses, thereby improving the overall image quality.

[0077] Specifically, please refer to Figure 1 and Figure 2A The optical imaging device of this application may include a lens barrel assembly and a lens assembly. The lens barrel assembly includes a first lens barrel and a second lens barrel arranged sequentially. The inner annular surfaces of the first lens barrel and the second lens barrel are both stepped. The lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens with positive optical power, arranged sequentially from the object side to the image side along the optical axis. The first lens, the second lens, and the third lens are disposed in the first lens barrel, and the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are disposed in the second lens barrel.

[0078] The optical imaging device satisfies the following relationships: 1.3 < fno < 1.4; 66° < Semi-FOV < 70°; 1.1 < d01s / DT11 < 1.5; 1.0 < d02m / DT82 < 1.2; where Semi-FOV is the maximum half field of view of the optical imaging device, fno is the numerical aperture of the optical imaging device, d01s is the inner diameter of the object-side surface of the first lens barrel, d02m is the inner diameter of the image-side surface of the second lens barrel, DT11 is the effective diameter of the light-transmitting portion of the object-side surface of the first lens, and DT82 is the effective diameter of the light-transmitting portion of the image-side surface of the eighth lens.

[0079] It is understandable that the optical imaging device of this application has the characteristics of large aperture, large field of view, and high performance, and achieves high assembly precision and yield through the combination of two lens barrels. However, due to the large aperture of this application, the brightness of the central area of ​​the image is high, while the brightness of the edge area is low. The field of view of the optical imaging device of this application is large, and when light passes through the edge part of the optical imaging device, there will be more scattering and absorption, resulting in a decrease in edge brightness. Furthermore, because the field of view of the optical imaging device of this application is very wide, light may be more obstructed when passing through the edge part of the optical imaging device, resulting in a vignetting effect, causing the four corners or edge areas of the image to appear darker, forming a non-uniform brightness phenomenon, which in turn affects the overall brightness balance and visual effect of the image, significantly increasing the manufacturing difficulty of the optical imaging device of this application. Therefore, the optical imaging device of this application achieves uniform light distribution by precisely controlling the ratio of the light transmission aperture of the first lens and the eighth lens to the corresponding inner diameter of the lens barrel. Based on the above relationships, by limiting the ranges of d01s / DT11 and d02m / DT82, the uniformity of light passing through the lens can be ensured, thereby significantly reducing edge brightness reduction and vignetting. When d01s / DT11 < 1.1 and d02m / DT82 < 1.0, the apertures of the first and second lenses are too large relative to the lens inner diameter, causing excessive light to enter the lens edge area, resulting in severe flare and scattering phenomena, reducing image contrast and sharpness. Simultaneously, the excessive concentration of light in the edge area increases the brightness difference between the center and edge areas, exacerbating the vignetting effect. Conversely, when d01s / DT11 > 1.5 and d02m / DT82 > 1.2, the apertures of the first and eighth lenses are too small relative to the lens barrel inner diameter, resulting in insufficient light in the edge area, making the image edges dark and also producing vignetting. Furthermore, a smaller aperture also limits the lens's resolution and sharpness, affecting overall image quality. Therefore, the optical imaging device of this application ensures the uniform distribution of light when passing through the lens by precisely controlling the ratio of the light-transmitting aperture of the first lens and the inner diameter of the lens barrel, effectively solving the relative illumination problem in the ultra-wide-angle large aperture dual-lens combination lens, thereby improving the overall imaging quality.

[0080] For example, such as Figure 8A , Figure 8B and Figure 8CAs shown, when the optical imaging device of this application satisfies the relationships fno = 1.338, Semi-FOV = 70°, d01s / DT11 = 1.18, and d02m / DT82 = 1.14, its design parameters are within the range defined by this application, and the relative illumination value is relatively normal. When the optical imaging device of this application satisfies the relationships fno = 1.338, Semi-FOV = 70°, d01s / DT11 = 1, and d02m / DT82 = 0.9, its design parameters do not conform to the range defined by this application, the value of DT11 is too large, resulting in severe speckle in the edge field of view, leading to a larger dark field angle effect, and the relative illumination curve drops and inverts. When the optical imaging device of this application satisfies the relationship fno=1.338, Semi-FOV=70°, d01s / DT11=1.6 and d02m / DT82=1.3, its design parameters do not conform to the range defined by this application. DT82 is too small, resulting in insufficient light, which leads to a larger vignetting effect and a drop in the relative illuminance curve.

[0081] Optionally, such as Figure 1 and Figure 2A As shown, in some embodiments, the image side of the first lens barrel of this application is fastened to the object side of the second lens barrel, and the first lens barrel and the second lens barrel satisfy the relationship: L1+L2>L; where L1 is the maximum height of the first lens barrel, L2 is the maximum height of the second lens barrel, and L is the overall maximum height of the lens barrel assembly.

[0082] This configuration, by fastening the first and second lens barrels together, not only increases the stability of the structure but also helps to disperse and balance the stress in the optical system.

[0083] Optionally, such as Figure 1 and Figure 2A As shown, in some embodiments, the image side of the first lens barrel of this application is provided with a chamfer, and the third lens and the second lens barrel are supported by the chamfer of the first lens.

[0084] This configuration, by setting a chamfer on the image side of the first lens barrel and forming a tight bearing relationship between the chamfer and the third lens and the second lens barrel, can reduce light loss, optimize image quality, enhance structural stability, and facilitate assembly and debugging, thereby effectively improving the performance of the entire optical system.

[0085] Optionally, such as Figure 1 and Figure 2A As shown, in some embodiments, at least half of the first to eighth lenses of this application are glass lenses.

[0086] This configuration, based on the different refractive indices of light of different wavelengths in glass, allows the glass lenses to effectively reduce chromatic aberration. By using a combination of glass lenses with different refractive indices, chromatic aberration can be significantly reduced, thereby improving image quality. Furthermore, the low coefficient of thermal expansion of glass allows it to maintain good stability in environments with large temperature variations, thus ensuring the long-term stability of the optical system.

[0087] Optionally, such as Figure 1 and Figure 2A As shown, in some embodiments, the refractive indices of the fourth to eighth lenses in the second lens barrel of this application are arranged in the order of low refractive index, high refractive index, low refractive index, high refractive index, and high refractive index.

[0088] This configuration, using a combination of glass with different refractive indices, effectively reduces chromatic aberration, thereby improving image quality. The refractive index combination in this application helps to better control distortion, resulting in clearer and sharper images. An appropriately distributed refractive index can improve the overall mechanical strength and stability of the structure. Improving optical performance through optimized refractive index matching increases the lens's light transmittance, reduces light loss, and improves the efficiency of the optical system. This design is suitable for a wide spectral range and can meet various application requirements.

[0089] Optionally, such as Figure 1 and Figure 2A As shown, in some embodiments, the optical imaging device of this application satisfies the following relationship: 0.5≤(D02s-d02s) / DT41<1; where DT41 is the effective diameter of the light-transmitting part of the fourth lens object side, D02s is the outer diameter of the object side of the lens barrel, and d02s is the inner diameter of the object side of the lens barrel.

[0090] This configuration, by controlling the ratio between the effective diameter of the lens and the inner and outer diameters of the lens barrel, helps reduce stray light and improve image quality. Controlling the size of the effective diameter balances the lens's resolution and contrast, avoiding imaging problems caused by an excessively large or small effective diameter. A suitable ratio makes it easier to mount the lens into the lens barrel, reducing assembly difficulty and time. It also avoids assembly errors caused by size mismatches, improving product consistency and reliability.

[0091] Optionally, such as Figure 1 and Figure 2AAs shown, in some embodiments, the optical imaging device of this application further includes a fourth spacer element disposed between the fourth lens and the fifth lens, and the object-side surface of the fourth spacer element at least partially contacts the image-side surface of the fourth lens; the optical imaging device satisfies the following relationships: 0.55 < d02s / R7 ≤ 0.80; -1.25 < d4s / R8 < -0.55; where d02s is the inner diameter of the object-side surface of the second lens barrel, d4s is the inner diameter of the object-side surface of the fourth spacer element, R8 is the radius of curvature of the image-side surface of the fourth lens, and R7 is the radius of curvature of the object-side surface of the fourth lens.

[0092] This configuration, by adjusting the ratio of d02s / R7 to d4s / R8, effectively controls and reduces aberrations in the system, such as spherical aberration. This improves image quality, especially in applications requiring high resolution. Controlling the ratio ensures consistent system performance under various operating conditions. An appropriate ratio contributes to improved resolution and contrast. Specifying clear dimensional ratios simplifies the alignment and fixing of optical components. It also reduces potential errors during assembly, improving assembly efficiency.

[0093] Optionally, such as Figure 1 and Figure 2A As shown, in some embodiments, the optical imaging device of this application satisfies the following relationships: 0.60 < d4s / f4 < 1.10; -0.95 < d4m / f5 ≤ -0.45; where d4s is the object-side inner diameter of the fourth spacer element, d4m is the image-side inner diameter of the fourth spacer element, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

[0094] This configuration, by adjusting the relationship between the object-side and image-side inner diameters of the fourth spacer element and the lens focal length, ensures efficient optical coupling between the fourth and fifth lenses. A precise ratio of inner diameter to focal length helps optimize the light path, reducing imaging distortions such as aberrations and chromatic aberration caused by improper lens spacing, thereby improving image sharpness, contrast, and color reproduction. By limiting the range of the aforementioned relationship, a proper match can be ensured between the object-side and image-side inner diameters of the fourth spacer element and the lens focal length, resulting in more uniform light transmission between the two lenses and thus improving the imaging quality of the optical system.

[0095] Optionally, such as Figure 1 and Figure 2AAs shown, in some embodiments, the optical imaging device of this application further includes a fifth spacer element disposed between the fifth lens and the sixth lens, and the object-side surface of the fifth spacer element is at least partially in contact with the image-side surface of the fifth lens; the optical imaging device satisfies the relationship: 0.2 < (D5s - D4s) / EP45 < 2.55; where D4s is the object-side outer diameter of the fourth spacer element, D5s is the object-side outer diameter of the fifth spacer element, and EP45 is the axial distance from the image-side surface of the fourth spacer element to the object-side surface of the fifth spacer element.

[0096] This configuration, with its aforementioned dimensional proportions, provides clear spatial constraints for the assembly process, helping manufacturers achieve higher precision and consistency in production. By controlling the outer diameter difference between the fourth and fifth spacer elements, precise alignment of the contact surfaces between the elements can be ensured, thereby improving the assembly accuracy of the entire optical system. The range limitation of the aforementioned relationship reduces optical errors caused by mismatched or incorrectly positioned spacer elements, thus improving production stability and reducing assembly deviations. It also reduces assembly processes requiring precise adjustments, improving production efficiency.

[0097] Optionally, such as Figure 1 and Figure 2A As shown, in some embodiments, the optical imaging device of this application satisfies the following relationships: -1.15≤d5s / f5<-0.6; 0.95≤d5m / f6<1.5; where d5s is the object-side inner diameter of the fifth spacer element, d5m is the image-side inner diameter of the fifth spacer element, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.

[0098] This configuration, by limiting the ratio between the object-side inner diameter of the fifth spacer element and the focal length of the fifth lens through the relationship -1.15 ≤ d5s / f5 < -0.6, ensures a proper match between the fifth spacer element and the fifth lens. Specifically, the range in the relationship specifies a reasonable ratio between the spacer element size and the lens focal length. This helps reduce scattering and errors during beam transmission, improving light transmission efficiency. It ensures that the object-side inner diameter of the fifth spacer element is not too large, avoiding beam scattering or errors in the optical path at the lens front end due to an excessively large object-side inner diameter, thus maintaining good optical imaging quality. The relationship between the image-side inner diameter of the fifth spacer element and the focal length of the sixth lens is constrained by the relationship 0.95 ≤ d5m / f6 < 1.5. This specifies that the image-side inner diameter d5m of the fifth spacer element must maintain a certain proportional relationship with the focal length f6 of the sixth lens, thereby ensuring that light can be smoothly transmitted from the fifth lens through the spacer element to the sixth lens. A suitable inner diameter ratio helps avoid beam deflection during transmission, ensuring image sharpness and contrast, and reducing distortion or aberrations in the optical system. This is especially important in higher resolution applications (such as mobile phone lenses), where it can significantly improve optical performance.

[0099] Optionally, such as Figure 1 and Figure 2A As shown, in some embodiments, the optical imaging device of this application further includes a sixth spacer element, a sixth front auxiliary spacer element, and a sixth rear auxiliary spacer element arranged sequentially from the object side to the image side. The sixth spacer element, the sixth front auxiliary spacer element, and the sixth rear auxiliary spacer element are all disposed between the sixth lens and the seventh lens, and the object side of the sixth spacer element is at least partially in contact with the image side of the sixth lens; the object side of the sixth front auxiliary spacer element is at least partially in contact with the image side of the sixth spacer element, and the object side of the sixth rear auxiliary spacer element is at least partially in contact with the image side of the sixth front auxiliary spacer element; the optical imaging device satisfies the relationship: 0.1≤(CP6+CP6b+CP6c) / |R12+R13|<1.5; where CP6 is the center thickness of the sixth spacer element, CP6b is the center thickness of the sixth front auxiliary spacer element, CP6c is the center thickness of the sixth rear auxiliary spacer element, R12 is the radius of curvature of the image side of the sixth lens, and R13 is the radius of curvature of the object side of the seventh lens.

[0100] This configuration, through the relationship (CP6+CP6b+CP6c) / |R12+R13|, controls the relationship between the center thickness of the sixth spacer element and its auxiliary spacers and the radius of curvature of the lens, thereby affecting the optical coupling efficiency between the lenses. The spacing design between the sixth and seventh lenses directly affects the light transmission path and the focusing characteristics of the beam. A reasonable match between the thickness and radius of curvature of the spacers can optimize light transmission, reduce aberrations such as diffraction and chromatic aberration caused by improper spacing, and ensure high-quality imaging.

[0101] By adjusting the relationship between (CP6+CP6b+CP6c) and the sum of the radii of curvature (|R12+R13|), light scattering and beam distortion caused by excessively large or small spacing can be reduced, thereby improving the system's imaging sharpness, contrast, and color reproduction. Setting the above formula ensures that the thickness of the spacer element is neither too large nor too small, thus avoiding optical deviations in the system. Precise spacer element design can reduce imaging errors caused by improper contact between optical elements or changes in the beam refraction angle, ensuring the structural stability of the system. Maintaining a reasonable ratio between the spacer element thickness and the lens radius of curvature improves the system's resistance to external factors such as temperature changes and vibrations, ensuring that the optical system maintains stable optical performance under various operating environments.

[0102] If the size ratio of the spacer element is too large or too small, it may cause unnecessary refraction of light propagation, resulting in blurred or distorted images. Therefore, as... Figure 1 and Figure 2A As shown, in some embodiments, the optical imaging device of this application satisfies the following relationship: 0.5 < (d6cm - d6s) / (DT71 - DT62) < 1.05; where d6s is the object-side inner diameter of the sixth spacer element, d6cm is the image-side inner diameter of the sixth rear auxiliary spacer element, DT62 is the effective diameter of the image-side light-transmitting portion of the sixth lens, and DT71 is the effective diameter of the object-side light-transmitting portion of the seventh lens.

[0103] This configuration, by precisely controlling the ratio between (d6cm-d6s) and (DT71-DT62), effectively reduces aberrations and optical distortions caused by mismatches between lenses and spacers. The aforementioned relationship ensures that light maintains a suitable incident angle and beam diameter as it passes through the sixth to seventh lenses, thereby guaranteeing the stability of the system's optical performance under different operating conditions. By optimizing this ratio, high resolution and contrast of the optical system can be ensured while reducing distortion.

[0104] Optionally, such as Figure 1 and Figure 2AAs shown, in some embodiments, the optical imaging device of this application further includes a seventh spacer element, which is disposed between the seventh lens and the eighth lens, and the object side of the seventh spacer element is at least partially in contact with the image side of the seventh lens; the optical imaging device satisfies the relationship: 0.2 < d6s / (f8-f7) ≤ 1.25; where d6s is the object side inner diameter of the sixth spacer element, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens.

[0105] This configuration provides a defined dimensional range for the aforementioned relationship, allowing for precise control of the spacer element's inner diameter during manufacturing. This ensures a precise fit between the seventh spacer element and the seventh and eighth lenses. Precise assembly helps reduce optical deviations caused by assembly errors, thereby guaranteeing the imaging consistency and reliability of the optical system. The precise spacer design not only optimizes optical performance but also enhances the stability of the optical system during long-term use. It avoids optical distortion or focal length drift caused by unsuitable spacer element dimensions, improving the system's anti-interference capability, especially under conditions of prolonged or high-frequency use.

[0106] The following describes in further detail specific embodiments of the optical imaging apparatus applicable to the above embodiments, with reference to the accompanying drawings.

[0107] like Figure 2A , Figure 2B and Figure 2C The images shown are a first example, a second example, and a third example of the first embodiment of this application. In the first embodiment of this application, the optical imaging device includes a lens barrel assembly and a lens assembly. The lens barrel assembly includes a first lens barrel P01 and a second lens barrel P02 arranged sequentially. The lens assembly includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially from the object side to the image side. The first lens E1, the second lens E2, and the third lens E3 are disposed within the first lens barrel P01, and the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8 are disposed within the second lens barrel P02.

[0108] The optical imaging device further includes a first spacer element P1, a second spacer element P2, a second auxiliary spacer element P2b, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, a sixth front auxiliary spacer element P6b, a sixth rear auxiliary spacer element P6c, and a seventh spacer element P7. The first spacer element P1 is disposed between the first lens E1 and the second lens E2, and at least partially contacts the image-side surface of the first lens E1. The second spacer element P2 is disposed between the second lens E2 and the third lens E3, and at least partially contacts the image-side surface of the second lens E2. The second auxiliary spacer element P2b is disposed between the second spacer element P2 and the third lens E3, and at least partially contacts the image-side surface of the second spacer element P2. The fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5, and at least partially contacts the image-side surface of the fourth lens E4. The fifth spacer element P5 is disposed between the fifth lens E5 and the sixth lens E6. The sixth auxiliary spacer P6 is disposed between the sixth lens E6 and the seventh lens E7, and at least partially contacts the image side of the sixth lens E6; the sixth front auxiliary spacer P6b is disposed between the sixth auxiliary spacer P6 and the seventh lens E7, and at least partially contacts the image side of the sixth auxiliary spacer P6; the sixth rear auxiliary spacer P6c is disposed between the sixth front auxiliary spacer P6b and the seventh lens E7, and at least partially contacts the image side of the sixth front auxiliary spacer P6b; the seventh spacer P7 is disposed between the seventh lens E7 and the eighth lens E8, and at least partially contacts the image side of the seventh lens E7.

[0109] The first lens E1 has negative optical power, and both its object-side and image-side surfaces are concave. The second lens E2 has positive optical power, and its object-side and image-side surfaces are concave and convex, respectively. The third lens E3 has negative optical power, and its object-side and image-side surfaces are convex and concave, respectively. The fourth lens E4 has positive optical power, and both its object-side and image-side surfaces are convex. The fifth lens E5 has negative optical power, and both its object-side and image-side surfaces are concave. The sixth lens E6 has positive optical power, and its object-side and image-side surfaces are concave and convex, respectively. The seventh lens E7 has negative optical power, and its object-side and image-side surfaces are convex and concave, respectively. The eighth lens E8 has positive optical power, and its object-side and image-side surfaces are concave and convex, respectively.

[0110] Table 1 shows the basic parameters of the lens of the optical imaging device of the first embodiment, where the units of radius of curvature and thickness are millimeters (mm). Table 2 shows the higher-order coefficients of the aspherical mirror of the optical imaging device of the first embodiment.

[0111] Table 1: Basic parameters of the lens in the optical imaging device of the first embodiment

[0112]

[0113] Table 2: High-order coefficients of the aspherical mirror surface of the optical imaging device in the first embodiment

[0114]

[0115]

[0116] Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.1963E-09 9.2309E-12 1.5058E-14 3.5742E-16 0.0000E+00 0.0000E+00 0.0000E+00 S2 -9.2846E-02 3.3313E-02 -8.5153E-03 1.5128E-03 -1.7751E-04 1.2370E-05 -3.8776E-07 S3 -1.8172E-04 8.8987E-06 6.5588E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -1.3930E-03 8.0373E-05 6.2932E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 -3.3278E-02 3.0573E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 -1.1938E-01 1.3007E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 -1.0393E-03 9.3844E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 3.8606E-02 -1.7508E-03 -3.3700E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 4.5937E-02 -3.2296E-03 -2.5143E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 7.6928E-04 -5.8534E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 -2.5010E-04 1.1438E-05 4.1318E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 2.5580E-05 -2.9788E-06 4.6921E-07 -4.4210E-08 1.9569E-09 0.0000E+00 0.0000E+00 S13 6.2360E-07 -9.3849E-09 -5.7450E-13 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S14 3.0924E-07 -3.8967E-09 -4.4743E-12 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S15 -1.3625E-07 1.6253E-09 4.1650E-12 8.1015E-14 0.0000E+00 0.0000E+00 0.0000E+00 S16 -4.5657E-08 4.8936E-10 1.7530E-14 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0117] In the first embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0118]

[0119] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 that can be used for each aspherical mirror S1-S14 in the first embodiment.

[0120] Figure 3A The on-axis chromatic aberration curve of the optical imaging device of the first embodiment is shown. Figure 3B The astigmatism curve of the optical imaging device of the first embodiment is shown. Figure 3C The distortion curve of the optical imaging device of the first embodiment is shown. According to... Figures 3A to 3C It can be seen that the optical imaging device given in the first embodiment has good imaging quality.

[0121] like Figure 4A , Figure 4B and Figure 4CThe images shown are a first example, a second example, and a third example of the second embodiment of this application. In the second embodiment of this application, the optical imaging device includes a lens barrel assembly and a lens assembly. The lens barrel assembly includes a first lens barrel P01 and a second lens barrel P02 arranged sequentially. The lens assembly includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially from the object side to the image side. The first lens E1, the second lens E2, and the third lens E3 are disposed within the first lens barrel P01, and the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8 are disposed within the second lens barrel P02.

[0122] The optical imaging device further includes a first spacer element P1, a second spacer element P2, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, a sixth front auxiliary spacer element P6b, a sixth rear auxiliary spacer element P6c, and a seventh spacer element P7. The first spacer element P1 is disposed between the first lens E1 and the second lens E2, and at least partially contacts the image-side surface of the first lens E1; the second spacer element P2 is disposed between the second lens E2 and the third lens E3, and at least partially contacts the image-side surface of the second lens E2; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5, and at least partially contacts the image-side surface of the fourth lens E4; the fifth spacer element P5 is disposed between the fifth lens E5 and the sixth lens E6, and at least partially contacts the image-side surface of the fifth lens E5; the sixth spacer element P7... P6 is disposed between the sixth lens E6 and the seventh lens E7, and at least partially contacts the image-side surface of the sixth lens E6; the sixth front auxiliary spacer P6b is disposed between the sixth spacer P6 and the seventh lens E7, and at least partially contacts the image-side surface of the sixth spacer P6; the sixth rear auxiliary spacer P6c is disposed between the sixth front auxiliary spacer P6b and the seventh lens E7, and at least partially contacts the image-side surface of the sixth front auxiliary spacer P6b; the seventh spacer P7 is disposed between the seventh lens E7 and the eighth lens E8, and at least partially contacts the image-side surface of the seventh lens E7.

[0123] The first lens E1 has negative optical power, and both its object-side and image-side surfaces are concave. The second lens E2 has positive optical power, and both its object-side and image-side surfaces are convex. The third lens E3 has negative optical power, and its object-side and image-side surfaces are concave and convex, respectively. The fourth lens E4 has positive optical power, and both its object-side and image-side surfaces are convex. The fifth lens E5 has negative optical power, and both its object-side and image-side surfaces are concave. The sixth lens E6 has positive optical power, and its object-side and image-side surfaces are concave and convex, respectively. The seventh lens E7 has negative optical power, and its object-side and image-side surfaces are convex and concave, respectively. The eighth lens E8 has positive optical power, and its object-side and image-side surfaces are concave and convex, respectively.

[0124] Table 3 shows the basic parameters of the lens of the optical imaging device of the second embodiment, where the units of radius of curvature and thickness are millimeters (mm). Table 4 shows the higher-order coefficients of the aspherical mirror of the optical imaging device of the second embodiment.

[0125] Table 3: Basic Parameters of the Lens in the Optical Imaging Device of the Second Embodiment

[0126]

[0127] Table 4: High-order coefficients of the aspherical mirror surface of the optical imaging device in the second embodiment

[0128]

[0129]

[0130] Face number A18 A20 A22 A24 A26 A28 A30 S1 -8.4959E-09 5.4456E-11 7.2599E-13 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -8.8127E-04 3.1581E-04 -6.1807E-05 8.1997E-06 -6.8813E-07 2.6990E-08 0.0000E+00 S3 -1.4021E-03 1.2429E-04 1.6327E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -1.5382E-02 1.7575E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 5.4464E-02 -7.9154E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 -2.4889E-01 2.9066E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 4.8784E-03 -4.8889E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 1.5451E-02 3.1815E-04 -2.3433E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 2.6451E-02 -7.4721E-04 -2.2737E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 6.1109E-04 -3.2732E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 -5.7982E-04 3.3283E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -1.6327E-03 7.0953E-04 -2.0861E-04 4.2397E-05 -5.7046E-06 4.5741E-07 -1.6640E-08 S13 7.4003E-07 -1.1783E-08 -1.2365E-11 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S14 7.4162E-07 -1.1713E-08 -1.4301E-12 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S15 -2.4644E-07 3.1279E-09 -1.2205E-11 8.4852E-13 0.0000E+00 0.0000E+00 0.0000E+00 S16 -7.2939E-08 8.0968E-10 6.4299E-14 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0131] In the second embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0132]

[0133] 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, A20, A22, A24, A26, A28 and A30 that can be used for each aspherical mirror S1-S14 in the second embodiment.

[0134] Figure 5A The on-axis chromatic aberration curve of the optical imaging device of the second embodiment is shown. Figure 5B The astigmatism curve of the optical imaging device of the second embodiment is shown. Figure 5C The distortion curve of the optical imaging device of the second embodiment is shown. According to... Figures 5A to 5C It can be seen that the optical imaging device given in the second embodiment has good imaging quality.

[0135] like Figure 6A , Figure 6B and Figure 6C The images shown are a first example, a second example, and a third example of the third embodiment of this application. In the third embodiment of this application, the optical imaging device includes a lens barrel assembly and a lens assembly. The lens barrel assembly includes a first lens barrel P01 and a second lens barrel P02 arranged sequentially. The lens assembly includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 arranged sequentially from the object side to the image side. The first lens E1, the second lens E2, and the third lens E3 are disposed within the first lens barrel P01, and the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8 are disposed within the second lens barrel P02.

[0136] The optical imaging device further includes a first spacer element P1, a second spacer element P2, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, a sixth front auxiliary spacer element P6b, a sixth rear auxiliary spacer element P6c, and a seventh spacer element P7. The first spacer element P1 is disposed between the first lens E1 and the second lens E2, and at least partially contacts the image-side surface of the first lens E1; the second spacer element P2 is disposed between the second lens E2 and the third lens E3, and at least partially contacts the image-side surface of the second lens E2; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5, and at least partially contacts the image-side surface of the fourth lens E4; the fifth spacer element P5 is disposed between the fifth lens E5 and the sixth lens E6, and at least partially contacts the image-side surface of the fifth lens E5; the sixth spacer element P7... P6 is disposed between the sixth lens E6 and the seventh lens E7, and at least partially contacts the image-side surface of the sixth lens E6; the sixth front auxiliary spacer P6b is disposed between the sixth spacer P6 and the seventh lens E7, and at least partially contacts the image-side surface of the sixth spacer P6; the sixth rear auxiliary spacer P6c is disposed between the sixth front auxiliary spacer P6b and the seventh lens E7, and at least partially contacts the image-side surface of the sixth front auxiliary spacer P6b; the seventh spacer P7 is disposed between the seventh lens E7 and the eighth lens E8, and at least partially contacts the image-side surface of the seventh lens E7.

[0137] The first lens E1 has negative optical power, and both its object-side and image-side surfaces are concave. The second lens E2 has positive optical power, and its object-side and image-side surfaces are concave and convex, respectively. The third lens E3 has positive optical power, and its object-side and image-side surfaces are convex and concave, respectively. The fourth lens E4 has positive optical power, and both its object-side and image-side surfaces are convex. The fifth lens E5 has negative optical power, and its object-side and image-side surfaces are convex and concave, respectively. The sixth lens E6 has positive optical power, and both its object-side and image-side surfaces are convex. The seventh lens E7 has negative optical power, and both its object-side and image-side surfaces are concave. The eighth lens E8 has positive optical power, and both its object-side and image-side surfaces are convex.

[0138] Table 5 shows the basic parameters of the lens of the optical imaging device of the third embodiment, where the units of radius of curvature and thickness are millimeters (mm). Table 6 shows the higher-order coefficients of the aspherical mirror of the optical imaging device of the third embodiment.

[0139] Table 5: Basic Parameters of the Lens in the Optical Imaging Device of the Third Embodiment

[0140]

[0141] Table 6: High-order coefficients of the aspherical mirrors in the optical imaging device of the third embodiment

[0142]

[0143]

[0144] Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.7615E-09 1.0115E-11 4.3074E-15 9.9925E-16 0.0000E+00 0.0000E+00 0.0000E+00 S2 -3.8956E-01 1.6912E-01 -5.2355E-02 1.1290E-02 -1.6119E-03 1.3699E-04 -5.2492E-06 S3 -1.4013E-03 9.6366E-05 2.8464E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -1.8042E-02 1.4774E-03 7.3422E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 -3.8994E-02 3.6251E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 -3.8294E-02 3.8692E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 1.3826E-03 -1.1945E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 6.8618E-03 -5.1851E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 -2.3230E-03 2.6660E-04 5.2674E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 1.7458E-03 -1.3713E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 -1.9659E-04 4.9545E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 5.5964E-04 -3.3651E-04 8.0824E-05 -1.0695E-05 6.6014E-07 0.0000E+00 0.0000E+00 S13 1.5365E-04 -7.4564E-06 3.6811E-07 -3.0530E-08 0.0000E+00 0.0000E+00 0.0000E+00 S14 1.1698E-05 -1.1561E-07 -9.7942E-09 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S15 -9.8611E-07 1.7813E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S16 -3.6857E-07 5.6967E-09 2.9533E-12 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0145] In the third embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0146]

[0147] 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 5 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. 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-S14 in the third embodiment.

[0148] Figure 7A The on-axis chromatic aberration curve of the optical imaging device of the third embodiment is shown. Figure 7B The astigmatism curve of the optical imaging device of the third embodiment is shown. Figure 7C The distortion curve of the optical imaging device according to the third embodiment is shown. Figures 7A to 7C It can be seen that the optical imaging device given in the third embodiment has good imaging quality.

[0149] The optical parameters of the optical imaging devices in the first, second, and third embodiments are as follows:

[0150] Example data First Embodiment Second Embodiment Third Embodiment f 2.094 2.092 2.097 FNO 1.338 1.386 1.350 Semi-FOV 70.000 68.600 66.000 f1 -4.461 -3.507 -3.647 f2 4.772 5.291 8.758 f3 -36.215 -45.215 228.364 f4 3.957 2.856 3.002 f5 -5.320 -3.167 -4.837 f6 3.484 3.330 2.606 f7 -19.966 -16.667 -1.880 f8 9.500 4.573 2.481

[0151] The dimensional data table for the optical imaging devices of the first, second, and third examples of the first, second, and third embodiments of the first, second, and third embodiments of the second embodiment is as follows:

[0152]

[0153]

[0154] The optical imaging devices of the first, second, and third embodiments satisfy the following relationship:

[0155] Conditional / Example 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 d01s / DT11 1.12 1.18 1.15 1.49 1.49 1.47 1.29 1.23 1.25 d02m / DT82 1.16 1.14 1.19 1.18 1.16 1.19 1.09 1.09 1.14 (D02s-d02s) / DT41 0.78 0.81 0.55 0.5 0.91 0.64 0.97 0.94 0.92 d02s / R7 0.75 0.69 0.80 0.64 0.56 0.62 0.62 0.61 0.63 d4s / R8 -0.69 -0.57 -0.64 -1.22 -1.21 -1.20 -1.16 -1.22 -1.18 d4s / f4 0.75 0.63 0.69 1.03 1.03 1.02 1.02 1.06 1.03 d4m / f5 -0.55 -0.45 -0.51 -0.91 -0.91 -0.90 -0.62 -0.65 -0.62 (D5s-D4s) / EP45 2.07 1.89 1.69 1.26 2.54 2.26 0.23 1.83 0.23 d5s / f5 -0.65 -0.66 -0.63 -1.15 -1.08 -1.15 -0.73 -0.75 -0.8 d5m / f6 0.98 1.01 0.95 1.08 0.99 1.08 1.19 1.39 1.46 (CP6+CP6b+CP6c) / |R12+R13| 0.77 0.77 0.77 1.28 1.48 1.46 0.1 0.11 0.11 (d6cm-d6s) / (DT71-DT62) 0.58 0.58 0.54 0.72 0.85 1.02 0.35 0.52 0.48 d7s / (f8-f7) 0.24 0.25 0.25 0.32 0.31 0.32 1.19 1.25 1.23

[0156] 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.

[0157] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An optical imaging device, characterized in that, include: The lens barrel assembly includes a first lens barrel and a second lens barrel arranged sequentially, wherein the inner circumferential surface of the first lens barrel and the inner circumferential surface of the second lens barrel are both stepped. A lens assembly comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having a positive optical power, arranged sequentially along the optical axis from the object side to the image side; the first lens, the second lens, and the third lens are disposed within a first lens barrel, and the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are disposed within a second lens barrel; The optical imaging device satisfies the following relationship: 1.3 < fno < 1.4; 66° < Semi-FOV < 70°; 1.1 < d01s / DT11 < 1.5; 1.0 < d02m / DT82 < 1.2; Wherein, Semi-FOV is the maximum half field of view of the optical imaging device, fno is the numerical aperture of the optical imaging device, d01s is the inner diameter of the object side of the first lens barrel, d02m is the inner diameter of the image side of the second lens barrel, DT11 is the effective diameter of the light-transmitting part of the object side of the first lens, and DT82 is the effective diameter of the light-transmitting part of the image side of the eighth lens.

2. The optical imaging device according to claim 1, characterized in that, The image side of the first lens tube is engaged with the object side of the second lens tube, and the first lens tube and the second lens tube satisfy the following relationship: L1 + L2 > L; Wherein, L1 is the maximum height of the first lens barrel, L2 is the maximum height of the second lens barrel, and L is the overall maximum height of the lens barrel assembly.

3. The optical imaging device according to claim 1, characterized in that, The image side of the first lens barrel is chamfered, and the third lens and the second lens barrel rest against the chamfer of the first lens.

4. The optical imaging device according to claim 1, characterized in that, Of the first to the eighth lenses, at least half are glass lenses.

5. The optical imaging device according to claim 1, characterized in that, The refractive indices of the fourth to eighth lenses within the second lens barrel are arranged in the order of low refractive index, high refractive index, low refractive index, high refractive index, and high refractive index.

6. The optical imaging apparatus according to any one of claims 1 to 5, characterized in that, The optical imaging device satisfies the following relationship: 0.5≤(D02s-d02s) / DT41<1; Wherein, DT41 is the effective diameter of the light-transmitting part on the side of the fourth lens, D02s is the outer diameter of the side of the lens barrel, and d02s is the inner diameter of the side of the lens barrel.

7. The optical imaging apparatus according to any one of claims 1 to 5, characterized in that, The optical imaging device further includes a fourth spacer element disposed between the fourth lens and the fifth lens, wherein the object-side surface of the fourth spacer element is at least partially in contact with the image-side surface of the fourth lens; the optical imaging device satisfies the following relationship: 0.55 < d02s / R7 ≤ 0.80; -1.25 < d4s / R8 < -0.55; Wherein, d02s is the inner diameter of the object side of the second lens barrel, d4s is the inner diameter of the object side of the fourth spacer element, R8 is the radius of curvature of the image side of the fourth lens, and R7 is the radius of curvature of the object side of the fourth lens.

8. The optical imaging device according to claim 7, characterized in that, The optical imaging device satisfies the following relationship: 0.60 < d4s / f4 < 1.10; -0.95 < d4m / f5 ≤ -0.45; Wherein, d4s is the object-side inner diameter of the fourth spacer element, d4m is the image-side inner diameter of the fourth spacer element, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

9. The optical imaging device according to claim 7, characterized in that, The optical imaging device further includes a fifth spacer element disposed between the fifth lens and the sixth lens, wherein the object-side surface of the fifth spacer element is at least partially in contact with the image-side surface of the fifth lens; the optical imaging device satisfies the following relationship: 0.2<(D5s-D4s) / EP45<2.55; Wherein, D4s is the object-side outer diameter of the fourth spacer element, D5s is the object-side outer diameter of the fifth spacer element, and EP45 is the axial distance from the image-side surface of the fourth spacer element to the object-side surface of the fifth spacer element.

10. The optical imaging device according to claim 9, characterized in that, The optical imaging device satisfies the following relationship: -1.15≤d5s / f5<-0.6; 0.95≤d5m / f6<1.5; Wherein, d5s is the object-side inner diameter of the fifth spacer element, d5m is the image-side inner diameter of the fifth spacer element, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.

11. The optical imaging apparatus according to any one of claims 1 to 5, characterized in that, The optical imaging device further includes a sixth spacer element, a sixth front auxiliary spacer element, and a sixth rear auxiliary spacer element arranged sequentially from the object side to the image side. The sixth spacer element, the sixth front auxiliary spacer element, and the sixth rear auxiliary spacer element are all disposed between the sixth lens and the seventh lens, and the object side of the sixth spacer element is at least partially in contact with the image side of the sixth lens. The object-side surface of the sixth front auxiliary spacer element is at least partially in contact with the image-side surface of the sixth spacer element, and the object-side surface of the sixth rear auxiliary element is at least partially in contact with the image-side surface of the sixth front auxiliary spacer element; the optical imaging device satisfies the following relationship: 0.1≤(CP6+CP6b+CP6c) / |R12+R13|<1.5; Wherein, CP6 is the center thickness of the sixth spacer element, CP6b is the center thickness of the sixth front auxiliary spacer element, CP6c is the center thickness of the sixth rear auxiliary spacer element, R12 is the radius of curvature of the image side of the sixth lens, and R13 is the radius of curvature of the object side of the seventh lens.

12. The optical imaging device according to claim 11, characterized in that, The optical imaging device satisfies the following relationship: 0.5<(d6cm-d6s) / (DT71-DT62)<1.05; Wherein, d6s is the object-side inner diameter of the sixth spacer element, d6cm is the image-side inner diameter of the sixth rear auxiliary spacer element, DT62 is the effective diameter of the image-side light-transmitting portion of the sixth lens, and DT71 is the effective diameter of the object-side light-transmitting portion of the seventh lens.

13. The optical imaging device according to claim 11, characterized in that, The optical imaging device further includes a seventh spacer element disposed between the seventh lens and the eighth lens, wherein the object-side surface of the seventh spacer element is at least partially in contact with the image-side surface of the seventh lens; the optical imaging device satisfies the following relationship: 0.2 < d7s / (f8-f7) ≤ 1.25; Wherein, d6s is the object-side inner diameter of the sixth spacer element, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens.

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