Optical imaging device

Abstract

The invention relates to an optical imaging device comprising a lens barrel assembly comprising a first lens barrel and a second lens barrel which are 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] The present invention relates to the technical field of optical elements, and in particular to an optical imaging device. Background Art

[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 usually result in higher brightness in the center of the image and lower brightness in the edge areas. This phenomenon is particularly evident in ultra-wide-angle lenses, because the field of view is larger, and when light passes through the edge of the lens, there will be more scattering and absorption, resulting in a decrease in edge brightness. And because the field of view of ultra-wide-angle lenses is very wide, light may be more obstructed when passing through the edge of the lens, resulting in a vignetting effect, causing the four corners or edge areas of the image to appear darker, forming a phenomenon of non-uniform brightness, which in turn affects the overall brightness balance and visual effect of the image, and the difficulty of manufacturing lenses with large apertures and large field of view will also increase significantly. Summary of the invention

[0003] Based on this, it is necessary to provide an optical imaging device to address the problem of uneven brightness in existing lenses with large apertures and large field of view.

[0004] An optical imaging device, comprising:

[0005] A lens barrel assembly, the lens barrel assembly comprising a first lens barrel and a second lens barrel arranged in sequence, wherein the inner annular surface of the first lens barrel and the inner annular surface of the second lens barrel are both stepped;

[0006] A lens assembly, the 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 with positive power, which are sequentially arranged along the optical axis from the object side to the image side; 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;

[0007] The optical imaging device satisfies the 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] Among them, Semi-FOV is the maximum half field of view angle 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 portion of the object side of the first lens, and DT82 is the effective diameter of the light-transmitting portion of the image side of the eighth lens.

[0013] In one embodiment, the image side of the first lens barrel is buckled with the object side of the second lens barrel, and the first lens barrel and the second lens barrel satisfy the 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 maximum height of the entire lens barrel assembly.

[0016] In one embodiment, the image side of the first lens barrel is provided with a chamfer, and the third lens and the second lens barrel are supported by the chamfer of the first lens.

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

[0018] In one embodiment, the refractive index combinations of the fourth lens to the eighth lens in the second lens barrel are low refractive index, high refractive index, low refractive index, high refractive index and high refractive index, respectively.

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

[0020] 0.5≤(D02s-d02s) / DT41<1;

[0021] Among them, DT41 is the effective diameter of the light-transmitting portion of the object side of the fourth lens, D02s is the outer diameter of the second object side of the lens barrel, and d02s is the inner diameter of the second object side of the lens barrel.

[0022] In one embodiment, the optical imaging device further includes a fourth spacer element, the fourth spacer element is 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 relationship:

[0023] 0.55<d02s / R7≤0.80;

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

[0025] Among them, 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 spacing element, R8 is the curvature radius of the image side of the fourth lens, and R7 is the curvature radius of the object side of the fourth lens.

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

[0027] 0.60<d4s / f4<1.10;

[0028] -0.95<d4m / f5≤-0.45;

[0029] Among them, d4s is the object side inner diameter of the fourth spacing element, d4m is the image side inner diameter of the fourth spacing 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, the fifth spacer element is disposed between the fifth lens and the sixth lens, and the object side surface of the fifth spacer element at least partially contacts the image side surface of the fifth lens; the optical imaging device satisfies the relationship:

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

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

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

[0034] -1.15≤d5s / f5<-0.6;

[0035] 0.95≤d5m / f6<1.5;

[0036] Among them, d5s is the object side inner diameter of the fifth spacing element, d5m is the image side inner diameter of the fifth spacing 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, which are arranged in sequence from the object side to the image side, and the sixth spacer element, the sixth front auxiliary spacer element, and the sixth rear auxiliary spacer element are all arranged between the sixth lens and the seventh lens, and the object side surface of the sixth spacer element at least partially contacts the image side surface of the sixth lens; the object side surface of the sixth front auxiliary spacer element at least partially contacts the image side surface of the sixth spacer element, and the object side surface of the sixth rear auxiliary element at least partially contacts the image side surface of the sixth front auxiliary spacer element; the optical imaging device satisfies the relationship:

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

[0039] Among them, 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 curvature radius of the image side surface of the sixth lens, and R13 is the curvature radius of the object side surface of the seventh lens.

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

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

[0042] Among them, 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 transmission portion of the sixth lens, and DT71 is the effective diameter of the object side light transmission portion of the seventh lens.

[0043] In one embodiment, the optical imaging device further includes a seventh spacer element, the seventh spacer element is disposed between the seventh lens and the eighth lens, and 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 relationship:

[0044] 0.2<d7s / (f8-f7)≤1.25;

[0045] Wherein, d6s is the object side inner diameter of the sixth spacing 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 the present application has the characteristics of large aperture, large field of view, and high performance, and achieves high assembly accuracy and yield through a dual-tube combination. However, due to the characteristics of the large aperture of the present application, the brightness of the central area of ​​the image is higher, while the brightness of the edge area is lower. The field of view of the optical imaging device of the present application is larger, and when the light passes through the edge of the optical imaging device, there will be more scattering and absorption, resulting in a decrease in edge brightness. And because the field of view of the optical imaging device of the present application is very wide, the light may be more obstructed when passing through the edge of the optical imaging device, thereby producing a dark corner effect, causing the four corners or edge areas of the image to appear darker, forming a phenomenon of non-uniform brightness, and then affecting the overall brightness balance and visual effect of the image, resulting in a significant increase in the manufacturing difficulty of the optical imaging device of the present application. Therefore, the optical imaging device of the present application achieves uniform distribution of light by precisely controlling the ratio of the clear aperture of the first lens and the eighth lens to the inner diameter of the corresponding lens barrel. According to the above relationship, by limiting the range of d01s / DT11 and d02m / DT82, the uniformity of light passing through the lens can be ensured, thereby significantly reducing the edge brightness drop and vignetting effect. When d01s / DT11<1.1 and d02m / DT82<1.0, the aperture of the first lens and the second lens is too large relative to the inner diameter of the lens, resulting in too much light entering the edge area of ​​the lens, causing serious light spots and scattering, reducing image contrast and clarity. At the same time, due to the excessive concentration of light in the edge area, the brightness difference between the central area and the edge area will increase, thereby exacerbating the vignetting effect. When d01s / DT11>1.5 and d02m / DT82>1.2, the aperture of the first lens and the eighth lens is too small relative to the inner diameter of the lens barrel, resulting in insufficient light in the edge area, making the edge of the image dark, and also producing a vignetting effect. In addition, a smaller aperture will also limit the resolution and sharpness of the lens, affecting the overall imaging quality. Therefore, the optical imaging device of the present application ensures uniform distribution of light when passing through the lens by precisely controlling the ratio of the light-clearing aperture of the first lens and the eighth lens to the inner diameter of the lens barrel, effectively solving the relative illumination problem in the ultra-wide-angle large aperture dual-lens barrel combination lens, thereby improving the overall imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram showing the dimensions of an optical imaging device according to an optional embodiment of the present invention is shown;

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

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

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

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

[0052] Figure 3B shows an astigmatism curve diagram of the optical imaging device of the first embodiment of the present invention;

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

[0054] Figure 4A A schematic structural diagram of an optical imaging device provided by a fourth example of the second embodiment of the present invention is shown;

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

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

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

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

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

[0060] Fig. 6A A schematic diagram showing the structure of an optical imaging device provided by a seventh example of the third embodiment of the present invention is shown;

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

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

[0063] Fig. 7A An on-axis chromatic aberration curve diagram of an optical imaging device according to a third embodiment of the present invention is shown;

[0064] Figure 7Bshows an astigmatism curve diagram of an optical imaging device according to a third embodiment of the present invention;

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

[0066] Fig. 8A A relative illumination curve diagram when the optical imaging device of an optional embodiment of the present invention satisfies fno=1.338, Semi-FOV=70°, d01s / DT11=1.18 and d02m / DT82=1.14;

[0067] Figure 8B A relative illumination curve diagram is shown when the optical imaging device of an optional embodiment of the present invention satisfies the relationship fno=1.338, Semi-FOV=70°, d01s / DT11=1 and d02m / DT82=0.9;

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

[0069] Figure markings: 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 spacing element; P2, second spacing element; P2b, second auxiliary spacing element; P4, fourth spacing element; P5, fifth spacing element; P6, sixth spacing element; P6b, sixth front auxiliary spacing element; P6c, sixth rear auxiliary spacing element; P7, seventh spacing element. DETAILED DESCRIPTION

[0070] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0071] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0072] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0073] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0075] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0076] Based on the problem of uneven brightness in existing lenses with large apertures and large field angles, the present application provides an optical imaging device. The optical imaging device of the present application has the characteristics of large aperture, large field angle, and high performance, and achieves high assembly accuracy and yield through a double-barrel combination. By accurately controlling the ratio of the aperture of the first lens and the eighth lens to the inner diameter of the barrel, the uniform distribution of light when passing through the lens is ensured, which can effectively solve the relative illumination problem in the ultra-wide-angle large aperture double-barrel combination lens, thereby improving the overall quality of imaging.

[0077] For details, please refer to Figure 1 and Figure 2A The optical imaging device of the present 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 in sequence, the inner annular surface of the first lens barrel and the inner annular surface of 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 negative optical power arranged in sequence from the object side to the image side along the optical axis; 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.

[0078] The optical imaging device satisfies the 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 angle 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 the present application has the characteristics of large aperture, large field of view, and high performance, and achieves high assembly accuracy and yield through a dual-tube combination. However, due to the characteristics of the large aperture of the present application, the brightness of the central area of ​​the image is higher, while the brightness of the edge area is lower. The field of view of the optical imaging device of the present application is larger, and when the light passes through the edge of the optical imaging device, there will be more scattering and absorption, resulting in a decrease in edge brightness. And because the field of view of the optical imaging device of the present application is very wide, the light may be more obstructed when passing through the edge of the optical imaging device, thereby producing a dark corner effect, causing the four corners or edge areas of the image to appear darker, forming a phenomenon of non-uniform brightness, and then affecting the overall brightness balance and visual effect of the image, resulting in a significant increase in the manufacturing difficulty of the optical imaging device of the present application. Therefore, the optical imaging device of the present application achieves uniform distribution of light by precisely controlling the ratio of the clear aperture of the first lens and the eighth lens to the inner diameter of the corresponding lens barrel. According to the above relationship, by limiting the range of d01s / DT11 and d02m / DT82, the uniformity of light passing through the lens can be ensured, thereby significantly reducing the edge brightness drop and vignetting effect. When d01s / DT11<1.1 and d02m / DT82<1.0, the aperture of the first lens and the second lens is too large relative to the inner diameter of the lens, resulting in too much light entering the edge area of ​​the lens, causing serious light spots and scattering, reducing image contrast and clarity. At the same time, due to the excessive concentration of light in the edge area, the brightness difference between the central area and the edge area will increase, thereby exacerbating the vignetting effect. When d01s / DT11>1.5 and d02m / DT82>1.2, the aperture of the first lens and the eighth lens is too small relative to the inner diameter of the lens barrel, resulting in insufficient light in the edge area, making the edge of the image dark, and also producing a vignetting effect. In addition, a smaller aperture will also limit the resolution and sharpness of the lens, affecting the overall imaging quality. Therefore, the optical imaging device of the present application ensures uniform distribution of light when passing through the lens by precisely controlling the ratio of the light-clearing aperture of the first lens and the eighth lens to the inner diameter of the lens barrel, effectively solving the relative illumination problem in the ultra-wide-angle large aperture dual-lens barrel combination lens, thereby improving the overall imaging quality.

[0080] For example, Fig. 8A , Figure 8B and Figure 8CAs shown, when the optical imaging device of the present application satisfies the relationship fno=1.338, Semi-FOV=70°, d01s / DT11=1.18 and d02m / DT82=1.14, its design parameters are in line with the range defined by the present application, and the relative illumination value is relatively normal. When the optical imaging device of the present application satisfies the relationship fno=1.338, Semi-FOV=70°, d01s / DT11=1 and d02m / DT82=0.9, its design parameters do not meet the range defined by the present application, the value of DT11 is too large, and severe speckle phenomenon occurs in the edge field of view area, resulting in a larger dark field angle effect, and the relative illumination curve drops and reverses. When the optical imaging device of the present 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 specified by the present application, DT82 is too small, and the light is insufficient, resulting in a larger vignetting effect and a drop in the relative illumination curve.

[0081] Alternatively, if Figure 1 and Figure 2A As shown, in some embodiments, the image side of the first lens barrel of the present application is buckled with the object side of the second lens barrel, and the first lens barrel and the second lens barrel satisfy the 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 maximum height of the entire lens barrel assembly.

[0082] Such arrangement, by buckling the first lens barrel and the second lens barrel, not only increases the stability of the structure, but also helps to disperse and balance the stress in the optical system.

[0083] Alternatively, if Figure 1 and Figure 2A As shown, in some embodiments, the image side of the first lens barrel of the present 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] In this way, by setting a chamfer on the image side of the first lens barrel and forming a close supporting relationship between the chamfer and the third lens and the second lens barrel, it is possible to reduce light loss, optimize imaging quality, enhance structural stability, and facilitate assembly and debugging, thereby effectively improving the performance of the entire optical system.

[0085] Alternatively, if Figure 1 and Figure 2A As shown, in some embodiments, among the first lens to the eighth lens of the present application, at least half of the lenses are glass lenses.

[0086] In this way, based on the different refractive indices of light of different wavelengths in glass, the glass lens can effectively reduce chromatic aberration. By using a combination of glass lenses with different refractive indices, chromatic aberration can be significantly reduced, thereby improving imaging quality. In addition, the glass material has a low coefficient of thermal expansion and can maintain good stability in an environment with large temperature changes, thereby ensuring the long-term stability of the optical system.

[0087] Alternatively, if Figure 1 and Figure 2A As shown, in some embodiments, the refractive index combinations of the fourth lens to the eighth lens in the second lens barrel of the present application are low refractive index, high refractive index, low refractive index, high refractive index and high refractive index, respectively.

[0088] By setting up in this way, through the combination of glasses with different refractive indices, chromatic aberration can be effectively reduced, thereby improving the imaging quality. The refractive index matching of this application helps to better control distortion, making the image clearer and sharper. The properly distributed refractive index can improve the mechanical strength and stability of the overall structure. Improve optical performance By optimizing the refractive index matching, the transmittance of the lens to light can be increased, light loss can be reduced, and the efficiency of the optical system can be improved. This design is suitable for a wide spectral range and can meet the needs of a variety of applications.

[0089] Alternatively, if Figure 1 and Figure 2A As shown, in some embodiments, the optical imaging device of the present application satisfies the relationship: 0.5≤(D02s-d02s) / DT41<1; wherein DT41 is the effective diameter of the light-transmitting portion of the object side of the fourth lens, D02s is the outer diameter of the second object side of the lens barrel, and d02s is the inner diameter of the second object side of the lens barrel.

[0090] This setting helps reduce stray light and improve image quality by controlling the ratio between the effective diameter of the lens and the inner and outer diameters of the lens barrel. By controlling the size of the effective diameter of the atlas, the resolution and contrast of the lens can be balanced to avoid imaging problems caused by too large or too small effective diameters. The appropriate ratio makes it easier to install the lens into the lens barrel, reducing the difficulty and time of assembly. It avoids assembly errors caused by size mismatch and improves product consistency and reliability.

[0091] Alternatively, if Figure 1 and Figure 2AAs shown, in some embodiments, the optical imaging device of the present application further includes a fourth spacer element, which is arranged between the fourth lens and the fifth lens, and 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 relationship: 0.55<d02s / R7≤0.80; -1.25<d4s / R8<-0.55; wherein, 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 curvature radius of the image side surface of the fourth lens, and R7 is the curvature radius of the object side surface of the fourth lens.

[0092] By adjusting the ratio of d02s / R7-d4s / R8, the aberrations in the system, such as spherical aberration, can be effectively controlled and reduced. The imaging quality can be improved, especially in applications requiring high resolution. By controlling the ratio, the high performance of the system can be ensured under different working conditions. The appropriate ratio helps to improve resolution and contrast. By specifying a clear size ratio, the alignment and fixing process of the optical components is simplified. It can reduce the errors that may occur during the assembly process and improve the assembly efficiency.

[0093] Alternatively, if Figure 1 and Figure 2A As shown, in some embodiments, the optical imaging device of the present application satisfies the relationship: 0.60<d4s / f4<1.10; -0.95<d4m / f5≤-0.45; wherein d4s is the object side inner diameter of the fourth spacing element, d4m is the image side inner diameter of the fourth spacing element, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

[0094] In this way, by adjusting the relationship between the inner diameter of the fourth spacer element on the object side and the image side and the focal length of the lens, the optical coupling efficiency between the fourth lens and the fifth lens can be ensured. The precise ratio of the inner diameter to the focal length helps to optimize the light path, and can reduce the imaging distortion such as aberration and chromatic aberration caused by improper lens spacing, thereby improving the clarity, contrast and color reproduction of the image. By limiting the range of the above relationship, it can be ensured that the fourth spacer element has an appropriate match between its inner diameter on the object side and the image side and the focal length of the lens, so that the light transmission between the two lenses is more uniform, thereby improving the imaging quality of the optical system.

[0095] Alternatively, if Figure 1 and Figure 2AAs shown, in some embodiments, the optical imaging device of the present application further includes a fifth spacer element, which is arranged 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; 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.

[0096] In this way, the above-mentioned dimensional ratio provides a clear spatial constraint for the assembly process, which can help manufacturers achieve higher precision and consistency in the production process. By controlling the difference in outer diameter between the fourth spacing element and the fifth spacing element, it is possible to ensure that the contact surfaces between the elements are accurately docked, thereby improving the assembly accuracy of the entire optical system. By limiting the range of the above-mentioned relationship, the optical error caused by the mismatch of the spacing element size or incorrect position can be reduced, thereby improving production stability and reducing deviations during assembly. It can also reduce the assembly process that requires precise adjustment, thereby improving production efficiency.

[0097] Alternatively, if Figure 1 and Figure 2A As shown, in some embodiments, the optical imaging device of the present application satisfies the 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.

[0098] In this way, the ratio between the inner diameter of the object side of the fifth spacer element and the focal length of the fifth lens is limited by the relationship -1.15≤d5s / f5<-0.6, which can ensure the matching relationship between the fifth spacer element and the fifth lens. Specifically, the range in the relationship specifies a reasonable ratio between the size of the spacer element and the focal length of the lens. It can help reduce scattering and errors during light beam transmission and improve the transmission efficiency of light. It ensures that the inner diameter of the object side of the fifth spacer element is not too large, avoiding beam scattering or errors in the optical path of the front end of the lens due to the excessive spacing of the inner diameter of the object side of the fifth spacer element, thereby maintaining good optical imaging quality. The relationship between the inner diameter of the image side of the fifth spacer element and the focal length of the sixth lens is constrained by the relationship 0.95≤d5m / f6<1.5. It is stipulated that the inner diameter d5m of the image side 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 to the sixth lens through the spacer element. The appropriate inner diameter ratio helps to avoid deflection of the light beam during transmission, ensures imaging clarity and contrast, and reduces distortion or aberration in the optical system, which can significantly improve optical performance, especially in higher resolution applications (such as mobile phone lenses).

[0099] Alternatively, if Figure 1 and Figure 2A As shown, in some embodiments, the optical imaging device of the present application further includes a sixth spacer element, a sixth front auxiliary spacer element, and a sixth rear auxiliary spacer element, which are arranged in sequence from the object side to the image side, and the sixth spacer element, the sixth front auxiliary spacer element and the sixth rear auxiliary spacer element are all arranged between the sixth lens and the seventh lens, and the object side surface of the sixth spacer element is at least partially in contact with the image side surface 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 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 curvature radius of the image side surface of the sixth lens, and R13 is the curvature radius of the object side surface of the seventh lens.

[0100] In this way, the relationship between the center thickness of the sixth spacer element and its auxiliary spacer element and the lens curvature radius is controlled by the relationship (CP6+CP6b+CP6c) / |R12+R13|, thereby affecting the optical coupling efficiency between the lenses. The spacing design between the sixth lens and the seventh lens directly affects the path of light transmission and the focusing characteristics of the light beam. Reasonable matching of the thickness of the spacer element and the curvature radius can optimize the transmission of light, 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 curvature radii (|R12+R13|), light scattering and beam distortion caused by excessive or small spacing can be reduced, thereby improving the imaging clarity, contrast and color reproduction of the system. The setting of the above relationship can ensure that the thickness of the spacing element is not too large or too small, thereby avoiding optical deviations in the system. Through the precise design of the spacing element, the imaging error caused by improper contact between optical elements or changes in the refraction angle of the light beam can be reduced, ensuring the structural stability of the system. By ensuring a reasonable ratio between the thickness of the spacing element and the radius of curvature of the lens, the system's ability to resist interference from external factors such as temperature changes and vibrations can be improved, ensuring that the optical system maintains stable optical performance under various usage environments.

[0102] If the size ratio of the spacer element is too large or too small, it may cause unnecessary refraction of the light propagation path, resulting in blurred or distorted imaging. Figure 1 and Figure 2A As shown, in some embodiments, the optical imaging device of the present application satisfies the relationship: 0.5<(d6cm-d6s) / (DT71-DT62)<1.05; wherein, d6s is the inner diameter of the object side of the sixth spacer element, d6cm is the inner diameter of the image side 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] By setting it this way, by precisely controlling the ratio of (d6cm-d6s) to (DT71-DT62), the aberration and optical distortion caused by the mismatch between the lens and the spacer element can be effectively reduced. The above relationship can ensure that the light maintains a suitable incident angle and beam diameter when passing between the sixth lens and the seventh lens, thereby ensuring the stability of the optical performance of the system under different working conditions. By optimizing the above ratio, the optical system can be ensured to have a high resolution and contrast while reducing distortion.

[0104] Alternatively, if Figure 1 and Figure 2AAs shown, in some embodiments, the optical imaging device of the present application further includes a seventh spacer element, which is arranged between the seventh lens and the eighth lens, and 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 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.

[0105] In this way, the above relationship provides a clear size range, and the inner diameter of the spacer element can be accurately controlled during the production process to ensure the precise fit between the seventh spacer element and the seventh lens and the eighth lens. Accurate assembly helps to reduce optical deviations caused by assembly errors, thereby ensuring the imaging consistency and reliability of the optical system. The precise spacing design not only optimizes the optical performance, but also enhances the stability of the optical system in long-term use. It avoids optical distortion or focal drift caused by inappropriate spacing element size, and improves the anti-interference ability of the system, especially under conditions of long-term or high-frequency use.

[0106] Specific embodiments of the optical imaging device applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0107] like Figure 2A , Figure 2B and Figure 2C The first example, the second example and the third example of the first embodiment of the present application are shown. In the first embodiment of the present 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 in sequence. 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 in sequence from the object side to the image side. The first lens E1, the second lens E2 and the third lens E3 are arranged in 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 arranged in the second lens barrel P02.

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

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

[0110] Table 1 shows a basic parameter table of the lens of the optical imaging device of the first embodiment, wherein the units of the radius of curvature and thickness are both millimeters (mm), and Table 2 shows a high-order coefficient table of the aspherical mirror surface of the optical imaging device of the first embodiment.

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

[0112]

[0113] Table 2: Table of high-order coefficients of the aspherical mirror surface of the optical imaging device of 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 the image side surface of any lens of the first lens E1 to the eighth lens E8 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0118]

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

[0120] Figure 3A shows the axial chromatic aberration curve of the optical imaging device of the first embodiment, 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. FIG. 3A to FIG. 3C It can be seen that the optical imaging device provided in the first embodiment has good imaging quality.

[0121] like Figure 4A , Figure 4B and Figure 4CThe first example, the second example and the third example of the second embodiment of the present application are shown. In the second embodiment of the present 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 in sequence. 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 in sequence from the object side to the image side. The first lens E1, the second lens E2 and the third lens E3 are arranged in 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 arranged in the second lens barrel P02.

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

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

[0124] Table 3 shows a basic parameter table of the lens of the optical imaging device of the second embodiment, wherein the units of the radius of curvature and thickness are both millimeters (mm), and Table 4 shows a high-order coefficient table of the aspherical mirror surface of the optical imaging device of the second embodiment.

[0125] Table 3: Basic parameters of the lens of the optical imaging device of the second embodiment

[0126]

[0127] Table 4: Table of high-order coefficients of the aspherical mirror surface of the optical imaging device of 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 the image side surface of any lens among the first lens E1 to the eighth lens E8 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0132]

[0133] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis direction: c is the paraxial curvature of the aspheric surface, c=1R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above): k is the cone coefficient: Ai is the correction coefficient of the i-th order of the aspheric surface. Table 4 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 that can be used for each aspheric mirror surface S1-S14 in the second embodiment.

[0134] Figure 5A shows the axial chromatic aberration curve of the optical imaging device of the second embodiment, 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. FIG. 5A to FIG. 5C It can be seen that the optical imaging device provided in the second embodiment has good imaging quality.

[0135] like Fig. 6A , Figure 6B and Figure 6C The first example, the second example and the third example of the third embodiment of the present application are shown. In the third embodiment of the present 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 in sequence. 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 in sequence from the object side to the image side. The first lens E1, the second lens E2 and the third lens E3 are arranged in 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 arranged in the second lens barrel P02.

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

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

[0138] Table 5 shows a basic parameter table of the lens of the optical imaging device of the third embodiment, wherein the units of the radius of curvature and thickness are both millimeters (mm), and Table 6 shows a high-order coefficient table of the aspherical mirror surface of the optical imaging device of the third embodiment.

[0139] Table 5: Basic parameters of the lens of the optical imaging device of the third embodiment

[0140]

[0141] Table 6: Table of high-order coefficients of the aspherical mirror surface of 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 the image side surface of any lens among the first lens E1 to the eighth lens E8 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0146]

[0147] Wherein, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis direction: c is the paraxial curvature of the aspherical surface, c=1R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 5 above): k is the cone coefficient: Ai is the correction coefficient of the i-th order of the aspherical surface. Table 6 below gives the high-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 surface S1-S14 in the third embodiment.

[0148] Fig. 7A shows the axial chromatic aberration curve of the optical imaging device of the third embodiment, 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 of the third embodiment is shown. FIG. 7A to FIG. 7C It can be seen that the optical imaging device provided in the third embodiment has good imaging quality.

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

[0150] The dimension data tables of the optical imaging devices of the first example, the second example, and the third example of the first embodiment, the first example, the second example, and the third example of the second embodiment, and the first example, the second example, and the third example of the third embodiment are as follows:

[0151]

[0153]

[0154] The optical imaging devices of the first embodiment, the second embodiment and the third embodiment 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-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical imaging device, characterized in that: include: A lens barrel assembly, the lens barrel assembly comprising a first lens barrel and a second lens barrel arranged in sequence, wherein the inner annular surface of the first lens barrel and the inner annular surface of the second lens barrel are both stepped; A lens assembly, the 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 with positive power, which are sequentially arranged along the optical axis from the object side to the image side; 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 relationship: 1.3<fno<1.4; 66°<Semi-FOV<70°; 1.1<d01s / DT11<1.5; 1.0<d02m / DT82<1.2; Among them, Semi-FOV is the maximum half field of view angle 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 portion of the object side of the first lens, and DT82 is the effective diameter of the light-transmitting portion 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 barrel is buckled with the object side of the second lens barrel, and the first lens barrel and the second lens barrel satisfy the 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 maximum height of the entire lens barrel assembly.

3. The optical imaging device according to claim 1, characterized in that: The image side of the first lens barrel is provided with a chamfer, and the third lens and the second lens barrel are supported by the chamfer of the first lens.

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

5. The optical imaging device according to claim 1, characterized in that: The refractive index combinations of the fourth lens to the eighth lens in the second lens barrel are low refractive index, high refractive index, low refractive index, high refractive index and high refractive index in sequence.

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

7. The optical imaging device according to any one of claims 1 to 5, characterized in that: The optical imaging device further includes a fourth spacer element, the fourth spacer element is 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 relationship: 0.55<d02s / R7≤0.80; -1.25<d4s / R8<-0.55; Among them, 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 spacing element, R8 is the curvature radius of the image side of the fourth lens, and R7 is the curvature radius 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 relationship: 0.60<d4s / f4<1.10; -0.95<d4m / f5≤-0.45; Among them, d4s is the object side inner diameter of the fourth spacing element, d4m is the image side inner diameter of the fourth spacing 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, the fifth spacer element is disposed between the fifth lens and the sixth lens, and the object side surface of the fifth spacer element at least partially contacts the image side surface of the fifth lens; the optical imaging device satisfies the relationship: 0.2<(D5s-D4s) / EP45<2.55; Wherein, D4s is the object side outer diameter of the fourth spacing element, D5s is the object side outer diameter of the fifth spacing element, and EP45 is the axial distance from the image side surface of the fourth spacing element to the object side surface of the fifth spacing element.

10. The optical imaging device according to claim 9, characterized in that: The optical imaging device satisfies the relationship: -1.15≤d5s / f5<-0.6; 0.95≤d5m / f6<1.5; Among them, d5s is the object side inner diameter of the fifth spacing element, d5m is the image side inner diameter of the fifth spacing 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 device according to any one of claims 1 to 5, characterized in that: The optical imaging device further comprises a sixth spacer element, a sixth front auxiliary spacer element, and a sixth rear auxiliary spacer element, which are sequentially arranged from the object side to the image side, wherein the sixth spacer element, the sixth front auxiliary spacer element, and the sixth rear auxiliary spacer element are all arranged between the sixth lens and the seventh lens, and the object side surface of the sixth spacer element at least partially contacts the image side surface of the sixth lens; The object side surface of the sixth front auxiliary spacer element at least partially contacts the image side surface of the sixth spacer element, and the object side surface of the sixth rear auxiliary element at least partially contacts the image side surface of the sixth front auxiliary spacer element; the optical imaging device satisfies the relationship: 0.1≤(CP6+CP6b+CP6c) / |R12+R13|<1.5; Among them, 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 curvature radius of the image side surface of the sixth lens, and R13 is the curvature radius of the object side surface of the seventh lens.

12. The optical imaging device according to claim 11, characterized in that: The optical imaging device satisfies the relationship: 0.5<(d6cm-d6s) / (DT71-DT62)<1.05; Among them, 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 transmission portion of the sixth lens, and DT71 is the effective diameter of the object side light transmission 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, the seventh spacer element is disposed between the seventh lens and the eighth lens, and the object side surface of the seventh spacer element at least partially contacts the image side surface of the seventh lens; the optical imaging device satisfies the relationship: 0.2<d7s / (f8-f7)≤1.25; Wherein, d6s is the object side inner diameter of the sixth spacing element, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens.

Images