An optical imaging system

Abstract

The application relates to an optical imaging system, comprising a first lens barrel and a second lens barrel arranged in sequence from an object side to an image side along an optical axis direction, the first lens barrel comprising a first lens and a second lens in sequence, the second lens barrel comprising a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence, a spacing element being arranged between two adjacent lenses in each lens barrel, the optical imaging system satisfying 13.45 < (d4s+d4m) / T45 < 14.20 and 1.90 < f345 / d5s < 2.40, so that the problem of stray light generated at the fourth lens and the fifth lens due to the increase of the edge thickness caused by the reduction of the optical aperture can be solved, and the imaging quality is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical devices, in particular to an optical imaging system. BACKGROUND

[0002] With the development of smart phones, users have higher requirements for the image of the phone, and the application scenarios are also more and more, for the periscope long focal length scheme, the current mainstream scheme is to place the whole optical imaging system horizontally in the phone, and a turning prism is made in front of the optical imaging system for light path turning. This scheme has obvious disadvantages in appearance, and the phone presents a square hollow, which does not match the circular hollow of the main camera lens. At the same time, the whole optical imaging system is placed horizontally in the phone, considering the demand for thinness of the phone, the edge cutting ratio of the system will be further increased, which not only loses the aperture size but also increases the process forming difficulty.

[0003] The present application effectively converges the light height in the first lens barrel, reduces the optical aperture of the lens group in the second lens barrel as much as possible, so that the edge cutting ratio can be reduced and the process forming difficulty can be reduced under the premise of meeting the thinness of the phone; the optical power of the lens group in the second lens barrel is mainly provided by the fourth lens and the fifth lens. However, with the reduction of the optical aperture of the lens group, the edge thickness of the lens at the middle part increases, which is easy to cause stray light phenomenon, affecting the image quality. SUMMARY

[0004] An advantage of the present application is to provide an optical imaging system which can solve the problem of stray light caused by the increase of edge thickness of the lens group in the second lens barrel due to the reduction of optical aperture.

[0005] According to an aspect of the present application, an optical imaging system is provided, comprising a first lens barrel and a second lens barrel arranged in sequence along the optical axis direction from the object side to the image side;

[0006] The first lens barrel comprises in sequence: a first lens with positive optical power, the object side surface of which is convex, and the image side surface of which is convex; a second lens with negative optical power;

[0007] A first spacing element is arranged between the first lens and the second lens, and the first spacing element is arranged on the image side surface of the first lens;

[0008] The second lens barrel sequentially comprises: a third lens with positive refractive power, the object side surface of which is convex; a fourth lens with negative refractive power, the object side surface of which is convex and the image side surface of which is concave; a fifth lens with positive refractive power, the object side surface of which is convex and the image side surface of which is convex; a sixth lens with negative refractive power, the object side surface of which is concave and the image side surface of which is convex; a seventh lens with positive refractive power or negative refractive power, the object side surface of which is concave and the image side surface of which is convex; and an eighth lens with negative refractive power, the object side surface of which is convex and the image side surface of which is concave;

[0009] A third spacer element is disposed between the third lens and the fourth lens and abuts against the image side surface of the third lens;

[0010] A fourth spacer element is disposed between the fourth lens and the fifth lens and abuts against the image side surface of the fourth lens;

[0011] A fifth spacer element is disposed between the fifth lens and the sixth lens and abuts against the image side surface of the fifth lens;

[0012] A sixth spacer element is disposed between the sixth lens and the seventh lens and abuts against the image side surface of the sixth lens;

[0013] A seventh spacer element is disposed between the seventh lens and the eighth lens and abuts against the image side surface of the seventh lens;

[0014] The optical imaging system also satisfies: 13.45 < (d4s+d4m) / T45 < 14.20; 1.90 < f345 / d5s < 2.40; wherein d4s is the inner diameter of the object side surface of the fourth spacer element, d4m is the inner diameter of the image side surface of the fourth spacer element, T45 is the air interval of the fourth lens and the fifth lens on the optical axis, f345 is the combined focal length of the third lens, the fourth lens and the fifth lens, and d5s is the inner diameter of the object side surface of the fifth spacer element.

[0015] In some embodiments, the optical imaging system also satisfies: 5.06 ≤ D5s / CT5 ≤ 6.55; wherein D5s is the outer diameter of the object side surface of the fifth spacer element, and CT5 is the center thickness of the fifth lens on the optical axis.

[0016] In some embodiments, the optical imaging system also satisfies: 6.10 mm ≤ f × (La / Lb) ≤ 8.58 mm; wherein f is the effective focal length of the optical imaging system, La is the maximum height of the first lens barrel, and Lb is the maximum height of the second lens barrel.

[0017] In some embodiments, the optical imaging system further satisfies: 5.35 < das / (CT1+CT2) < 6.55; where das is an inner diameter of the first lens barrel object side surface, CT1 is a center thickness of the first lens on the optical axis, and CT2 is a center thickness of the second lens on the optical axis.

[0018] In some embodiments, the optical imaging system further satisfies: -2.85 < R2 / (D1s+D1m) < -1.80; where R2 is a radius of curvature of the first lens image side surface, D1s is an outer diameter of the first spacer element object side surface, and D1m is an outer diameter of the first spacer element image side surface.

[0019] In some embodiments, the optical imaging system further satisfies: 9.95 < Das / (EP01+CP1) < 16.75; where Das is an outer diameter of the first lens barrel object side surface, EP01 is a distance along the optical axis from the first lens barrel object side surface to the first spacer element object side surface, and CP1 is a maximum thickness of the first spacer element along the optical axis.

[0020] In some embodiments, the optical imaging system further satisfies: 0.98 ≤ R5 / dbs ≤ 1.40; where R5 is a radius of curvature of the third lens object side surface, and dbs is an inner diameter of the second lens barrel object side surface.

[0021] In some embodiments, the optical imaging system further satisfies: 3.70 < d3s / (CT3+CT4) < 4.80; where d3s is an inner diameter of the third spacer element object side surface, CT3 is a center thickness of the third lens on the optical axis, and CT4 is a center thickness of the fourth lens on the optical axis.

[0022] In some embodiments, the optical imaging system further satisfies: -3.30 < f6 / (d6s+d6m) < -1.80; where f6 is an effective focal length of the sixth lens, d6s is an inner diameter of the sixth spacer element object side surface, and d6m is an inner diameter of the sixth spacer element image side surface.

[0023] In some embodiments, the optical imaging system further satisfies: -18.15 ≤ f678 / (EP67+CP7) ≤ -10.71; where f678 is a combined focal length of the sixth lens, the seventh lens, and the eighth lens, EP67 is a distance along the optical axis from the sixth spacer element image side surface to the seventh spacer element object side surface, and CP7 is a maximum thickness of the seventh spacer element along the optical axis.

[0024] In some embodiments, the optical imaging system further satisfies: -7.88≤f4 / (CP3+EP34)≤-2.83; where f4 is the effective focal length of the fourth lens, CP3 is the maximum thickness of the third spacer element along the optical axis, and EP34 is the distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis.

[0025] In some embodiments, the optical imaging system further satisfies: 2.90≤Lb / (EP45+EP56)≤4.43; where Lb is the maximum height of the second lens barrel, EP45 is the distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis, and EP56 is the distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis.

[0026] In some embodiments, the optical imaging system further satisfies: 1.75≤(D7m-d7m) / CT8≤3.31; where D7m is the outer diameter of the image side surface of the seventh spacer element, d7m is the inner diameter of the image side surface of the seventh spacer element, and CT8 is the center thickness of the eighth lens along the optical axis.

[0027] In some embodiments, the optical imaging system further satisfies: 0.95<dam / dbm<1.60, where dam is the inner diameter of the image side surface of the first lens barrel, and dbm is the inner diameter of the image side surface of the second lens barrel.

[0028] In summary, the optical imaging system provided in the present application is under the premise of 13.45<(d4s+d4m) / T45<14.20, the lens group in the second lens barrel mainly relies on the fourth lens and the fifth lens to bear the main optical power, and the fourth lens has a relatively thick edge, which is prone to cause stray light problems that are difficult to optimize at the supporting and cooperating position with the fifth lens. Therefore, by constraining 1.90<f345 / d5s<2.40, the stray light near the fourth lens and the fifth lens can be optimized, and the imaging quality is further improved. When the upper limit of the conditional expression is exceeded, the fifth spacer element blocks more light, which has a greater impact on the performance of the outer field of view, and the imaging quality is poor; when the lower limit of the conditional expression is exceeded, the fifth spacer element cannot block some useless light, which has a greater impact on the performance of the inner and outer fields of view, and the imaging quality is poor. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of size parameters of an optical imaging system according to an embodiment of the present application;

[0030] Figure 2 is a schematic diagram of structure parameters of an optical imaging system according to an embodiment of the present application;

[0031] Figure 3 is a structural schematic diagram of an optical imaging system according to an embodiment one of the present application;

[0032] Figure 4 is a structural schematic diagram of an optical imaging system according to an embodiment two of the present application;

[0033] Figure 5 is a structural schematic diagram of an optical imaging system according to an embodiment three of the present application;

[0034] Figure 6A shows an on-axis chromatic aberration curve schematic diagram of the optical imaging system according to the above embodiment one, the above embodiment two and the above embodiment three of the present application;

[0035] Figure 6B shows an astigmatism curve schematic diagram of the optical imaging system according to the above embodiment one, the above embodiment two and the above embodiment three of the present application;

[0036] Figure 6C shows a distortion curve schematic diagram of the optical imaging system according to the above embodiment one, the above embodiment two and the above embodiment three of the present application;

[0037] Figure 6D shows a lateral chromatic aberration curve schematic diagram of the optical imaging system according to the above embodiment one, the above embodiment two and the above embodiment three of the present application;

[0038] Figure 7 is a structural schematic diagram of an optical imaging system according to an embodiment four of the present application;

[0039] Figure 8 is a structural schematic diagram of an optical imaging system according to an embodiment five of the present application;

[0040] Figure 9 is a structural schematic diagram of an optical imaging system according to an embodiment six of the present application;

[0041] Figure 10A shows an on-axis chromatic aberration curve schematic diagram of the optical imaging system according to the above embodiment four, the above embodiment five and the above embodiment six of the present application;

[0042] Figure 10B shows an astigmatism curve schematic diagram of the optical imaging system according to the above embodiment four, the above embodiment five and the above embodiment six of the present application;

[0043] Figure 10C shows a distortion curve schematic diagram of the optical imaging system according to the above embodiment four, the above embodiment five and the above embodiment six of the present application;

[0044] Figure 10DA schematic diagram of the magnification chromatic aberration curves of the optical imaging systems of Embodiments 4, 5, and 6 according to this application is shown.

[0045] Figure 11 This is a schematic diagram of the structure of an optical imaging system according to Embodiment Seven of this application;

[0046] Figure 12 This is a schematic diagram of the structure of an optical imaging system according to Embodiment 8 of this application;

[0047] Figure 13 This is a schematic diagram of the structure of an optical imaging system according to Embodiment Nine of this application;

[0048] Figure 14A A schematic diagram of the on-axis chromatic aberration curves of the optical imaging systems of Embodiments 7, 8, and 9 according to this application is shown.

[0049] Figure 14B A schematic diagram of astigmatism curves of the optical imaging systems of Embodiments 7, 8, and 9 according to this application is shown.

[0050] Figure 14C A schematic diagram of the distortion curves of the optical imaging systems of Embodiments 7, 8, and 9 according to this application is shown.

[0051] Figure 14D A schematic diagram of the magnification chromatic aberration curves of the optical imaging systems of Embodiments 7, 8, and 9 according to this application is shown.

[0052] Figure 15 The modulation transfer function curve of the optical imaging system is shown when (d4s+d4m) / T45=13.8 and f345 / d5s=2.2.

[0053] Figure 16 The modulation transfer function curve of the optical imaging system is shown when (d4s+d4m) / T45=13.8 and f345 / d5s=2.7.

[0054] Figure 17 The modulation transfer function curve of the optical imaging system is shown when (d4s+d4m) / T45=13.8 and f345 / d5s=1.65. Detailed Implementation

[0055] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0056] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0057] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0058] In this paper, the paraxial region refers to the area near the optical axis. If the lens surface is convex and its location is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and its location is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined by the sign of the R value (R refers to the radius of curvature of the paraxial region). In this paper, the surface of each lens closest to the subject is called the object-side surface, and the surface of each lens closest to the imaging plane is called the image-side surface. For the object-side surface, when the R value is positive, it is considered convex, and when the R value is negative, it is considered concave; for the image-side surface, when the R value is positive, it is considered concave, and when the R value is negative, it is considered convex.

[0059] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0060] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0061] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The following embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be understood as limiting the scope of the patent of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0062] According to an aspect of the present application, as shown in Figure 1 and Figure 2 An embodiment of the present application proposes an optical imaging system, which can include a first lens barrel and a second lens barrel arranged in order from an object side to an image side along an optical axis direction;

[0063] The first lens barrel sequentially includes: a first lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is convex; a second lens with negative refractive power;

[0064] A first spacing element is arranged between the first lens and the second lens, and abuts against the image side surface of the first lens;

[0065] The second lens barrel sequentially includes: a third lens with positive refractive power, the object side surface of which is convex; a fourth lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave; a fifth lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is convex; a sixth lens with negative refractive power, the object side surface of which is concave, and the image side surface of which is convex; a seventh lens with positive or negative refractive power, the object side surface of which is concave, and the image side surface of which is convex; an eighth lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave;

[0066] A third spacing element is arranged between the third lens and the fourth lens, and abuts against the image side surface of the third lens;

[0067] A fourth spacing element is arranged between the fourth lens and the fifth lens, and abuts against the image side surface of the fourth lens;

[0068] A fifth spacer element is placed between the fifth lens and the sixth lens and abuts against the image side of the fifth lens;

[0069] A sixth spacer element is placed between the sixth lens and the seventh lens and abuts against the image side of the sixth lens;

[0070] A seventh spacer element is placed between the seventh lens and the eighth lens and abuts against the image side of the seventh lens;

[0071] The optical imaging system also satisfies: 13.45 < (d4s + d4m) / T45 < 14.20; 1.90 < f345 / d5s < 2.40; where d4s is the inner diameter of the object side of the fourth spacer element, d4m is the inner diameter of the image side of the fourth spacer element, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, f345 is the combined focal length of the third lens, the fourth lens and the fifth lens, and d5s is the inner diameter of the object side of the fifth spacer element.

[0072] In summary, under the condition that 13.45 < (d4s + d4m) / T45 < 14.20, the lens group in the second lens barrel of the optical imaging system provided in this application mainly relies on the fourth and fifth lenses to bear the main optical power. Furthermore, the fourth lens, being relatively thick, is prone to generating stray light problems that are difficult to optimize at the contact and mating positions with the fifth lens. Therefore, this application, by constraining 1.90 < f345 / d5s < 2.40, can optimize the stray light near the fourth and fifth lenses, further improving image quality. When the upper limit of the conditional expression is exceeded, the fifth spacer element blocks a significant amount of light, greatly affecting the external field of view performance and resulting in poor image quality. When the lower limit of the conditional expression is exceeded, the fifth spacer element fails to block some useless light, significantly affecting the internal and external field of view performance and resulting in poor image quality.

[0073] like Figure 15 As shown, Figure 15 The graph shows the modulation transfer function (MTF) curve when the optical imaging system satisfies (d4s+d4m) / T45=13.8 and f345 / d5s=2.2. (From...) Figure 15 It can be seen that when the optical imaging system satisfies the constraints provided in this application, 13.45<(d4s+d4m) / T45<14.20; 1.90<f345 / d5s<2.40, the MTF performance of the optical imaging system is good and the imaging quality is excellent.

[0074] like Figure 16 As shown, Figure 16 The graph shows the modulation transfer function (MTF) curve when the optical imaging system satisfies (d4s+d4m) / T45=13.8 and f345 / d5s=2.7. (From...) Figure 16It can be seen that when the optical imaging system exceeds the upper limit of the condition 1.90<f345 / d5s<2.40, the modulation transfer function curve shows a significant drop as the image height increases, indicating that the external field of view MTF performance of the optical imaging system is poor and the imaging quality is poor.

[0075] like Figure 17 As shown, Figure 17 The graph shows the modulation transfer function (MTF) curve when the optical imaging system satisfies (d4s+d4m) / T45=13.8 and f345 / d5s=1.65. (From...) Figure 17 It can be seen that when the optical imaging system exceeds the lower limit of the condition 1.90 < f345 / d5s < 2.40, the modulation transfer function value is generally low, and there is a significant drop as the image height increases. This indicates that the MTF performance of both the inner and outer fields of view of the optical imaging system is poor, and the imaging quality is poor.

[0076] According to some embodiments of this application, the optical imaging system also satisfies: 5.06 ≤ D5s / CT5 ≤ 6.55; where D5s is the outer diameter of the side surface of the fifth spacer element, and CT5 is the center thickness of the fifth lens on the optical axis. By reasonably controlling this conditional range, the processing difficulty of the fifth lens can be reduced, and the structural arrangement of the lens group inside the second lens barrel can be guaranteed.

[0077] According to some embodiments of this application, the optical imaging system also satisfies: 6.10mm ≤ f×(La / Lb) ≤ 8.58mm; where f is the effective focal length of the optical imaging system, La is the maximum height of the first lens barrel, and Lb is the maximum height of the second lens barrel. By reasonably controlling this conditional range, the overall height of the optical imaging system can be effectively controlled, meeting the height requirements of the lens module and the motor arrangement requirements.

[0078] According to some embodiments of this application, the optical imaging system also satisfies: 5.35 < das / (CT1+CT2) < 6.55; where das is the inner diameter of the side of the first lens barrel, CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis. By reasonably controlling the range of this condition, the overall height of the first and second lenses can be effectively controlled while ensuring their manufacturability, thereby ensuring the overall height of the lens module and facilitating further reduction of the phone's thickness.

[0079] According to some embodiments of the present application, the optical imaging system further satisfies: -2.85 < R2 / (D1s+D1m) < -1.80; wherein R2 is the radius of curvature of the image side surface of the first lens, D1s is the outer diameter of the object side surface of the first spacer element, and D1m is the outer diameter of the image side surface of the first spacer element. By reasonably controlling the range of this conditional formula, the machinability of the first lens as a whole can be ensured, while the aperture size of the overall optical imaging system is ensured, satisfying the system imaging requirements.

[0080] According to some embodiments of the present application, the optical imaging system further satisfies: 9.95 < Das / (EP01+CP1) < 16.75; wherein Das is the outer diameter of the object side surface of the first lens barrel, EP01 is the distance along the optical axis from the object side surface of the first lens barrel to the object side surface of the first spacer element, and CP1 is the maximum thickness of the first spacer element along the optical axis. By reasonably controlling the range of this conditional formula, the overall height of the first lens barrel can be effectively controlled, thereby controlling the height of the lens module and the entire machine, ensuring the thinning of the mobile phone.

[0081] According to some embodiments of the present application, the optical imaging system further satisfies: 0.98 ≤ R5 / dbs ≤ 1.40; wherein R5 is the radius of curvature of the object side surface of the third lens, and dbs is the inner diameter of the object side surface of the second lens barrel. By reasonably controlling the range of this conditional formula, the machinability of the third lens is ensured, while the aperture size of the overall optical imaging system is ensured.

[0082] According to some embodiments of the present application, the optical imaging system further satisfies: 3.70 < d3s / (CT3+CT4) < 4.80; wherein d3s is the inner diameter of the object side surface of the third spacer element, CT3 is the central thickness of the third lens on the optical axis, and CT4 is the central thickness of the fourth lens on the optical axis. By reasonably controlling the range of this conditional formula, the outer diameter-thickness ratio of the third lens and the fourth lens can be effectively controlled, ensuring good machinability.

[0083] According to some embodiments of the present application, the optical imaging system further satisfies: -3.30 < f6 / (d6s+d6m) < -1.80; wherein f6 is the effective focal length of the sixth lens, d6s is the inner diameter of the object side surface of the sixth spacer element, and d6m is the inner diameter of the image side surface of the sixth spacer element. By reasonably controlling the range of this conditional formula, the light loss can be reduced and the yield of the lens group is ensured. When the ratio is too large, the sixth spacer element intercepts too much light, causing loss of light energy, reducing the brightness and contrast of the image plane; when the ratio is too small, the sensitivity of the sixth lens is too high, which requires too high in the assembly process of the sixth lens, affecting the yield of the lens group, and further affecting the yield of the overall optical imaging system.

[0084] According to some embodiments of the present application, the optical imaging system further satisfies: -18.15≤f678 / (EP67+CP7)≤-10.71; wherein f678 is the combined focal length of the sixth lens, the seventh lens and the eighth lens, EP67 is the interval between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element along the optical axis, and CP7 is the maximum thickness of the seventh spacer element along the optical axis. By reasonably controlling the range of this conditional formula, the structural requirements of the last three lenses can be guaranteed, and the miniaturization of the module and the whole machine can be met.

[0085] According to some embodiments of the present application, the optical imaging system further satisfies: -7.88≤f4 / (CP3+EP34)≤-2.83; wherein f4 is the effective focal length of the fourth lens, CP3 is the maximum thickness of the third spacer element along the optical axis, and EP34 is the interval between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis.

[0086] According to some embodiments of the present application, the optical imaging system further satisfies: 2.90≤Lb / (EP45+EP56)≤4.43; wherein Lb is the maximum height of the second lens barrel, EP45 is the interval between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis, and EP56 is the interval between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis. By reasonably controlling the range of this conditional formula, the processability and assembly stability of the fourth lens can be guaranteed, and the influence of the fourth lens on performance and aperture in the system can be ensured.

[0087] According to some embodiments of the present application, the optical imaging system further satisfies: 1.75≤(D7m-d7m) / CT8≤3.31; wherein D7m is the outer diameter of the image side surface of the seventh spacer element, d7m is the inner diameter of the image side surface of the seventh spacer element, and CT8 is the center thickness of the eighth lens on the optical axis. By reasonably controlling the range of this conditional formula, the outer diameter thickness ratio of the eighth lens can be effectively controlled, and the assembly stability of the eighth lens can be guaranteed.

[0088] According to some embodiments of the present application, the optical imaging system further satisfies: 0.95<dam / dbm<1.60, wherein dam is the inner diameter of the image side surface of the first lens barrel, and dbm is the inner diameter of the image side surface of the second lens barrel. By reasonably controlling the range of this conditional formula, the overall light height in the optical imaging system can be effectively controlled, the lens barrel volume can be reduced as much as possible under the premise of ensuring the aperture of the optical imaging system, and the miniaturization of the lens module and the whole machine can be guaranteed.

[0089] It should be noted that those skilled in the art should understand that the number of spacers constituting the optical imaging system can be changed to obtain the various results and advantages described in this specification without departing from the technical solutions claimed in this application, and this application does not specifically limit this. For example, the optical imaging system may also include other numbers of spacers than those described in the above embodiments, as needed.

[0090] The following describes some specific, non-limiting embodiments of the above-described embodiments of this application in more detail with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ represents the object plane of the optical imaging system, STO represents the surface of the aperture stop, S1 represents the object-side surface of the first lens E1, S2 represents the image-side surface of the first lens E1, S3 represents the object-side surface of the second lens E2, S4 represents the image-side surface of the second lens E2, S5 represents the object-side surface of the prism PM1, S6 represents the image-side surface of the prism PM1, S7 represents the object-side surface of the third lens E3, S8 represents the image-side surface of the third lens E3, S9 represents the object-side surface of the fourth lens E4, S10 represents the image-side surface of the fourth lens E4, and S11 represents... S12 represents the object-side surface of the fifth lens E5, S13 represents the object-side surface of the sixth lens E6, S14 represents the image-side surface of the sixth lens E6, S15 represents the object-side surface of the seventh lens E7, S16 represents the image-side surface of the seventh lens E7, S17 represents the object-side surface of the eighth lens E8, S18 represents the image-side surface of the eighth lens E8, S19 represents the object-side surface of the prism PM2, S20 represents the image-side surface of the prism PM2, S21 represents the object-side surface of the filter E9, S22 represents the image-side surface of the filter E9, and S23 represents the image plane.

[0091] Example 1

[0092] like Figure 3 As shown, in this embodiment, the optical imaging system includes a first lens barrel Pa and a second lens barrel Pb arranged sequentially along the optical axis from the object side to the image side. The first lens barrel Pa contains a first lens E1 and a second lens E2, and the second lens barrel Pb contains 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.

[0093] In this embodiment, the optical imaging system further comprises a first spacer element P1 disposed between the first lens E1 and the second lens E2 and against the image side of the first lens E1, a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and against the image side of the third lens E3, a fourth spacer element P4 disposed between the fourth lens E4 and the fifth lens E5 and against the image side of the fourth lens E4, a fifth spacer element P5 disposed between the fifth lens E5 and the sixth lens E6 and against the image side of the fifth lens E5, a sixth spacer element P6 disposed between the sixth lens E6 and the seventh lens E7 and against the image side of the sixth lens E6, and a seventh spacer element P7 disposed between the seventh lens E7 and the eighth lens E8 and against the image side of the seventh lens E7.

[0094] In this embodiment, the first lens E1 has a positive focal power, the object side of the first lens E1 is convex, and the image side of the first lens E1 is convex; the second lens E2 has a negative focal power, the object side of the second lens E2 is concave, and the image side of the second lens E2 is convex; the third lens E3 has a positive focal power, the object side of the third lens E3 is convex, and the image side of the third lens E3 is concave; the fourth lens E4 has a negative focal power, the object side of the fourth lens E4 is convex, and the image side of the fourth lens E4 is concave; the fifth lens E5 has a positive focal power, the object side of the fifth lens E5 is convex, and the image side of the fifth lens E5 is convex; the sixth lens E6 has a negative focal power, the object side of the sixth lens E6 is concave, and the image side of the sixth lens E6 is convex; the seventh lens E7 has a negative focal power, the object side of the seventh lens E7 is concave, and the image side of the seventh lens E7 is convex; and the eighth lens E8 has a negative focal power, the object side of the eighth lens E8 is convex, and the image side of the eighth lens E8 is concave.

[0095] In addition, Table 1 shows the basic optical parameters of the optical imaging system of Embodiment One, wherein the units of the radius of curvature and the thickness / distance are millimeters (mm).

[0096] Table 1

[0097]

[0098] In this embodiment, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface type x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0099]

[0100] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Tables 2 and 3 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical mirrors S1 to S4 and S7 to S18 in Example 1.

[0101] Table 2

[0102]

[0103] Table 3

[0104]

[0105] Example 2

[0106] like Figure 4 As shown, in this embodiment, the optical imaging system includes a first lens barrel Pa and a second lens barrel Pb arranged sequentially along the optical axis from the object side to the image side. The first lens barrel Pa contains a first lens E1 and a second lens E2, and the second lens barrel Pb contains 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.

[0107] In this embodiment, the optical imaging system further includes a first spacer element P1 disposed between the first lens E1 and the second lens E2 and abutting against the image side of the first lens E1; a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and abutting against the image side of the third lens E3; a fourth spacer element P4 disposed between the fourth lens E4 and the fifth lens E5 and abutting against the image side of the fourth lens E4; a fifth spacer element P5 disposed between the fifth lens E5 and the sixth lens E6 and abutting against the image side of the fifth lens E5; a sixth spacer element P6 disposed between the sixth lens E6 and the seventh lens E7 and abutting against the image side of the sixth lens E6; and a seventh spacer element P7 disposed between the seventh lens E7 and the eighth lens E8 and abutting against the image side of the seventh lens E7.

[0108] It is worth noting that, compared with the above-mentioned embodiment one, the optical imaging system of this embodiment two has the same optical parameters, that is, the basic optical parameter table of the optical imaging system of this embodiment two is the same as Table 1, and the aspherical surface coefficient table is the same as Table 2 and Table 3. However, the optical imaging system of this embodiment two and the optical imaging system of the above-mentioned embodiment one have different structural parameters, that is, the difference between this embodiment two and the above-mentioned embodiment one lies in that the size values of part of the structural parameters of the lens barrel and the spacer element in the optical imaging system are different.

[0109] Embodiment three

[0110] As shown in the figure, in this embodiment, the optical imaging system comprises a first lens barrel Pa and a second lens barrel Pb arranged in sequence along the optical axis from the object side to the image side, wherein the first lens barrel Pa contains a first lens E1 and a second lens E2, and the second lens barrel Pb contains 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.

[0111] In this embodiment, the optical imaging system further comprises a first spacer element P1 arranged between the first lens E1 and the second lens E2 and abutting against the image side surface of the first lens E1, a third spacer element P3 arranged between the third lens E3 and the fourth lens E4 and abutting against the image side surface of the third lens E3, a fourth spacer element P4 arranged between the fourth lens E4 and the fifth lens E5 and abutting against the image side surface of the fourth lens E4, a fifth spacer element P5 arranged between the fifth lens E5 and the sixth lens E6 and abutting against the image side surface of the fifth lens E5, a sixth spacer element P6 arranged between the sixth lens E6 and the seventh lens E7 and abutting against the image side surface of the sixth lens E6, and a seventh spacer element P7 arranged between the seventh lens E7 and the eighth lens E8 and abutting against the image side surface of the seventh lens E7.

[0112] It is worth noting that, compared with the above-mentioned embodiment one, the optical imaging system of this embodiment three has the same optical parameters, that is, the basic optical parameter table of the optical imaging system of this embodiment three is the same as Table 1, and the aspherical surface coefficient table is the same as Table 2 and Table 3. However, the optical imaging system of this embodiment three and the optical imaging system of the above-mentioned embodiment one have different structural parameters, that is, the difference between this embodiment three and the above-mentioned embodiment one lies in that the size values of part of the structural parameters of the lens barrel and the spacer element in the optical imaging system are different.

[0113] In summary, the on-axis chromatic aberration curves of the optical imaging systems in the embodiment one, the embodiment two and the embodiment three are shown in the figure, which represent the convergence focus deviation degrees of light rays of different wavelengths after passing through the optical imaging systems; the astigmatism curves of the optical imaging systems in the embodiment one, the embodiment two and the embodiment three are shown in the figure, which represent the astigmatism degrees of the light rays of different wavelengths after passing through the optical imaging systems; and the distortion curves of the optical imaging systems in the embodiment one, the embodiment two and the embodiment three are shown in the figure, which represent the distortion degrees of the light rays of different wavelengths after passing through the optical imaging systems. Figure 6A Figure 6B ​​Figure 6B Figure 6 shows the distortion curves of the optical imaging system in Example One, Example Two and Example Three, which represent the degree of meridional and sagittal image curvature. Figure 6C Figure 7 shows the magnification chromatic aberration curves of the optical imaging system in Example One, Example Two and Example Three, which represent the degree of deviation of the ideal image from the actual image. Figure 6D Figure 8 shows the lateral chromatic aberration curves of the optical imaging system in Example One, Example Two and Example Three, which represent the degree of deviation of light rays of different wavelengths on the image plane after passing through the optical imaging system. Figure 6A Figure 6B Figure 6C Figure 6D It can be seen that the optical imaging systems in Example One, Example Two and Example Three can all achieve good imaging quality.

[0114] Example Four

[0115] As shown in Figure 9, in this embodiment, the optical imaging system comprises a first lens barrel Pa and a second lens barrel Pb arranged in sequence along the optical axis from the object side to the image side, wherein the first lens barrel Pa contains a first lens E1 and a second lens E2, and the second lens barrel Pb contains 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. Figure 7 In this embodiment, the optical imaging system further comprises a first spacer element P1 disposed between the first lens E1 and the second lens E2 and abutting the image side of the first lens E1, a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and abutting the image side of the third lens E3, a fourth spacer element P4 disposed between the fourth lens E4 and the fifth lens E5 and abutting the image side of the fourth lens E4, a fifth spacer element P5 disposed between the fifth lens E5 and the sixth lens E6 and abutting the image side of the fifth lens E5, a sixth spacer element P6 disposed between the sixth lens E6 and the seventh lens E7 and abutting the image side of the sixth lens E6, and a seventh spacer element P7 disposed between the seventh lens E7 and the eighth lens E8 and abutting the image side of the seventh lens E7.

[0116]

[0117] ​​​​In this embodiment, the first lens E1 has positive optical power, and its object-side surface and image-side surface are both convex; the second lens E2 has negative optical power, and its object-side surface and image-side surface are both convex; the third lens E3 has positive optical power, and its object-side surface and image-side surface are both convex; the fourth lens E4 has negative optical power, and its object-side surface and image-side surface are both convex; the fifth lens E5 has positive optical power, and its object-side surface and image-side surface are both convex; the sixth lens E6 has negative optical power, and its object-side surface and image-side surface are both concave; the seventh lens E7 has positive optical power, and its object-side surface and image-side surface are both concave; the eighth lens E8 has negative optical power, and its object-side surface and image-side surface are both convex.

[0118] In addition, Table 4 shows the basic optical parameters of the optical imaging system of Embodiment 4, where the units of radius of curvature and thickness / distance are millimeters (mm).

[0119] Table 4

[0120]

[0121] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the aspherical formula in Embodiment 1. Tables 5 and 6 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S1 to S4 and S7 to S18 in Embodiment 4.

[0122] Table 5

[0123]

[0124] Table 6

[0125]

[0126] Example 5

[0127] like Figure 8 As shown, in this embodiment, the optical imaging system includes a first lens barrel Pa and a second lens barrel Pb arranged sequentially along the optical axis from the object side to the image side. The first lens barrel Pa contains a first lens E1 and a second lens E2, and the second lens barrel Pb contains 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.

[0128] In this embodiment, the optical imaging system further includes a first spacer element P1 disposed between the first lens E1 and the second lens E2 and abutting against the image side of the first lens E1; a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and abutting against the image side of the third lens E3; a fourth spacer element P4 disposed between the fourth lens E4 and the fifth lens E5 and abutting against the image side of the fourth lens E4; a fifth spacer element P5 disposed between the fifth lens E5 and the sixth lens E6 and abutting against the image side of the fifth lens E5; a sixth spacer element P6 disposed between the sixth lens E6 and the seventh lens E7 and abutting against the image side of the sixth lens E6; and a seventh spacer element P7 disposed between the seventh lens E7 and the eighth lens E8 and abutting against the image side of the seventh lens E7.

[0129] It is worth noting that, compared with Embodiment 4 above, the optical imaging system of Embodiment 5 has the same optical parameters, that is, the basic optical parameter table of the optical imaging system of Embodiment 5 is the same as Table 4, and the aspherical coefficient table is the same as Tables 5 and 6. However, the optical imaging system of Embodiment 5 has different structural parameters from the optical imaging system of Embodiment 4 above. That is, the difference between Embodiment 5 and Embodiment 4 above lies in the fact that the dimensional values ​​of some structural parameters of the lens barrel and the spacer element in the optical imaging system are different.

[0130] Example 6

[0131] like Figure 9 As shown, in this embodiment, the optical imaging system includes a first lens barrel Pa and a second lens barrel Pb arranged sequentially along the optical axis from the object side to the image side. The first lens barrel Pa contains a first lens E1 and a second lens E2, and the second lens barrel Pb contains 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.

[0132] In this embodiment, the optical imaging system further includes a first spacer element P1 disposed between the first lens E1 and the second lens E2 and abutting against the image side of the first lens E1; a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and abutting against the image side of the third lens E3; a fourth spacer element P4 disposed between the fourth lens E4 and the fifth lens E5 and abutting against the image side of the fourth lens E4; a fifth spacer element P5 disposed between the fifth lens E5 and the sixth lens E6 and abutting against the image side of the fifth lens E5; a sixth spacer element P6 disposed between the sixth lens E6 and the seventh lens E7 and abutting against the image side of the sixth lens E6; and a seventh spacer element P7 disposed between the seventh lens E7 and the eighth lens E8 and abutting against the image side of the seventh lens E7.

[0133] It is worth noting that, compared with the above-mentioned embodiment four, the optical imaging system of this embodiment six has the same optical parameters, that is, the basic optical parameter table of the optical imaging system of this embodiment six is the same as table 4, and the aspherical surface coefficient table is the same as table 5, table 6. The optical imaging system of this embodiment six and the optical imaging system of the above-mentioned embodiment four have different structure parameters, that is, the difference between this embodiment six and the above-mentioned embodiment four is that the size values of part of the structure parameters of the lens barrel and the spacer element in the optical imaging system are different.

[0134] In summary, the on-axis chromatic aberration curves of the optical imaging systems in embodiment four, embodiment five and embodiment six are shown in Figure 10A , which represent the convergence focus deviation of light rays of different wavelengths after passing through the optical imaging system; the astigmatism curves of the optical imaging systems in embodiment four, embodiment five and embodiment six are shown in Figure 10B , which represent the meridional image surface curvature and sagittal image surface curvature, the distortion curves of the optical imaging systems in embodiment four, embodiment five and embodiment six are shown in Figure 10C , which represent the deviation degree of ideal picture and actual picture, the magnification chromatic aberration curves of the optical imaging systems in embodiment four, embodiment five and embodiment six are shown in Figure 10D , which represent the deviation degree of light rays of different wavelengths on the image surface after passing through the optical imaging system. According to Figure 10A , Figure 10B , Figure 10C , Figure 10D It can be known that the optical imaging systems in embodiment four, embodiment five and embodiment six can all achieve good imaging quality.

[0135] Embodiment seven

[0136] As shown in Figure 11 , in this embodiment, the optical imaging system includes a first lens barrel Pa and a second lens barrel Pb arranged in sequence along the optical axis from the object side to the image side, wherein the first lens barrel Pa contains a first lens E1 and a second lens E2, and the second lens barrel Pb contains 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.

[0137] In this embodiment, the optical imaging system further comprises a first spacer element P1 disposed between the first lens E1 and the second lens E2 and against the image side of the first lens E1, a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and against the image side of the third lens E3, a fourth spacer element P4 disposed between the fourth lens E4 and the fifth lens E5 and against the image side of the fourth lens E4, a fifth spacer element P5 disposed between the fifth lens E5 and the sixth lens E6 and against the image side of the fifth lens E5, a sixth spacer element P6 disposed between the sixth lens E6 and the seventh lens E7 and against the image side of the sixth lens E6, and a seventh spacer element P7 disposed between the seventh lens E7 and the eighth lens E8 and against the image side of the seventh lens E7.

[0138] In this embodiment, the first lens E1 has positive focal power, the object side of the first lens E1 is convex, and the image side of the first lens E1 is convex; the second lens E2 has negative focal power, the object side of the second lens E2 is convex, and the image side of the second lens E2 is concave; the third lens E3 has positive focal power, the object side of the third lens E3 is convex, and the image side of the third lens E3 is convex; the fourth lens E4 has negative focal power, the object side of the fourth lens E4 is convex, and the image side of the fourth lens E4 is concave; the fifth lens E5 has positive focal power, the object side of the fifth lens E5 is convex, and the image side of the fifth lens E5 is convex; the sixth lens E6 has negative focal power, the object side of the sixth lens E6 is concave, and the image side of the sixth lens E6 is convex; the seventh lens E7 has negative focal power, the object side of the seventh lens E7 is concave, and the image side of the seventh lens E7 is convex; and the eighth lens E8 has negative focal power, the object side of the eighth lens E8 is convex, and the image side of the eighth lens E8 is concave.

[0139] In addition, Table 7 shows the basic optical parameters of the optical imaging system of Embodiment Seven, wherein the units of the radius of curvature, thickness / distance are millimeters (mm).

[0140] Table 7

[0141]

[0142] In this embodiment, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface type x of each aspherical surface can be defined by, but not limited to, the aspherical surface formula as in Embodiment One. The following Tables 8 and 9 show the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for the aspherical surfaces S1 to S4, S7 to S18 in Embodiment Seven.

[0143] Table 8

[0144]

[0145] Table 9

[0146]

[0147] Example Eight

[0148] As shown in the figure, in this example, the optical imaging system comprises a first lens barrel Pa and a second lens barrel Pb arranged in sequence along the optical axis from the object side to the image side, wherein the first lens barrel Pa contains a first lens E1 and a second lens E2, and the second lens barrel Pb contains 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. Figure 12 In this example, the optical imaging system further comprises a first spacer element P1 disposed between the first lens E1 and the second lens E2 and abutting the image side of the first lens E1, a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and abutting the image side of the third lens E3, a fourth spacer element P4 disposed between the fourth lens E4 and the fifth lens E5 and abutting the image side of the fourth lens E4, a fifth spacer element P5 disposed between the fifth lens E5 and the sixth lens E6 and abutting the image side of the fifth lens E5, a sixth spacer element P6 disposed between the sixth lens E6 and the seventh lens E7 and abutting the image side of the sixth lens E6, and a seventh spacer element P7 disposed between the seventh lens E7 and the eighth lens E8 and abutting the image side of the seventh lens E7.

[0149] It is worth noting that, compared with the above-mentioned example seven, the optical imaging system of this example eight has the same optical parameters, i.e., the basic optical parameter table of the optical imaging system of this example eight is the same as that of Table 7, and the aspheric surface coefficient table is the same as that of Table 8 and Table 9. While the optical imaging system of this example eight and the optical imaging system of the above-mentioned example seven have different structural parameters, i.e., the difference between this example eight and the above-mentioned example seven lies in that the size values of some structural parameters of the lens barrel and the spacer element in the optical imaging system are different.

[0150] Example Nine

[0151] As shown in the figure, in this example, the optical imaging system comprises a first lens barrel Pa and a second lens barrel Pb arranged in sequence along the optical axis from the object side to the image side, wherein the first lens barrel Pa contains a first lens E1 and a second lens E2, and the second lens barrel Pb contains 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.

[0152] Figure 13 It is worth noting that, compared with the above-mentioned example seven, the optical imaging system of this example eight has the same optical parameters, i.e., the basic optical parameter table of the optical imaging system of this example eight is the same as that of Table 7, and the aspheric surface coefficient table is the same as that of Table 8 and Table 9. While the optical imaging system of this example eight and the optical imaging system of the above-mentioned example seven have different structural parameters, i.e., the difference between this example eight and the above-mentioned example seven lies in that the size values of some structural parameters of the lens barrel and the spacer element in the optical imaging system are different.

[0153] ​In this embodiment, the optical imaging system further comprises a first spacer element P1 disposed between the first lens E1 and the second lens E2 and against the image side of the first lens E1, a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and against the image side of the third lens E3, a fourth spacer element P4 disposed between the fourth lens E4 and the fifth lens E5 and against the image side of the fourth lens E4, a fifth spacer element P5 disposed between the fifth lens E5 and the sixth lens E6 and against the image side of the fifth lens E5, a sixth spacer element P6 disposed between the sixth lens E6 and the seventh lens E7 and against the image side of the sixth lens E6, and a seventh spacer element P7 disposed between the seventh lens E7 and the eighth lens E8 and against the image side of the seventh lens E7.

[0154] It is worth noting that, compared with the above-mentioned embodiment seven, the optical imaging system of this embodiment nine has the same optical parameters, i.e., the basic optical parameter table of the optical imaging system of this embodiment nine is the same as table 7, and the aspherical surface coefficient table is the same as table 8 and table 9. The optical imaging system of this embodiment nine and the optical imaging system of the above-mentioned embodiment seven have different structural parameters, i.e., the difference between this embodiment nine and the above-mentioned embodiment seven lies in that the size values of some structural parameters of the lens barrel and the spacer elements in the optical imaging system are different.

[0155] In summary, the on-axis chromatic aberration curves of the optical imaging systems in embodiment seven, embodiment eight and embodiment nine are shown in Figure 14A , which represent the convergence focus deviation of light rays of different wavelengths after passing through the optical imaging system; the astigmatism curves of the optical imaging systems in embodiment seven, embodiment eight and embodiment nine are shown in Figure 14B , which represent the meridional image surface curvature and sagittal image surface curvature; the distortion curves of the optical imaging systems in embodiment seven, embodiment eight and embodiment nine are shown in Figure 14C , which represent the deviation degree of the ideal image and the actual image; the magnification chromatic aberration curves of the optical imaging systems in embodiment seven, embodiment eight and embodiment nine are shown in Figure 14D , which represent the deviation degree of light rays of different wavelengths on the image plane after passing through the optical imaging system. According to Figure 14A , Figure 14B , Figure 14C , Figure 14D , it can be known that the optical imaging systems in embodiment seven, embodiment eight and embodiment nine can all achieve good imaging quality.

[0156] In summary, in Embodiment 1 to Embodiment 9, the effective focal lengths f1 to f8 of the first lens E1 to the eighth lens E8 in the optical imaging system, the effective focal length f of the optical imaging system, the combined focal length f345 of the third lens E3, the fourth lens E4 and the fifth lens E5, and the combined focal length f678 of the sixth lens E6, the seventh lens E7 and the eighth lens E8 are respectively shown in Table 10 below.

[0157] Table 10

[0158]

[0159] In addition, the structural parameters of the optical imaging system in Embodiment 1 to Embodiment 9 are specifically shown in Table 11, wherein the meaning of each parameter is as follows: D1s is the outer diameter of the object side surface of the first spacer element P1, D1m is the outer diameter of the image side surface of the first spacer element P1, d3s is the inner diameter of the object side surface of the third spacer element P3, d4s is the inner diameter of the object side surface of the fourth spacer element P4, d4m is the inner diameter of the image side surface of the fourth spacer element P4, d5s is the inner diameter of the object side surface of the fifth spacer element P5, D5s is the outer diameter of the object side surface of the fifth spacer element P5, d6s is the inner diameter of the object side surface of the sixth spacer element P6, d6m is the inner diameter of the image side surface of the sixth spacer element P6, d7m is the inner diameter of the image side surface of the seventh spacer element P7, D7m is the outer diameter of the image side surface of the seventh spacer element P7, das is the inner diameter of the object side surface of the first lens barrel Pa, dam is the inner diameter of the image side surface of the first lens barrel Pa, Das is the outer diameter of the object side surface of the first lens barrel Pa, dbs is the inner diameter of the object side surface of the second lens barrel Pb, dbm is the inner diameter of the image side surface of the second lens barrel Pb, La is the maximum height of the first lens barrel Pa, Lb is the maximum height of the second lens barrel Pb, EP01 is the distance between the object side surface of the first lens barrel Pa and the object side surface of the first spacer element P1 along the optical axis, CP1 is the maximum thickness of the first spacer element P1 along the optical axis, CP3 is the maximum thickness of the third spacer element P3 along the optical axis, EP34 is the distance between the image side surface of the third spacer element P3 and the object side surface of the fourth spacer element P4 along the optical axis, EP45 is the distance between the image side surface of the fourth spacer element P4 and the object side surface of the fifth spacer element P5 along the optical axis, EP56 is the distance between the image side surface of the fifth spacer element P5 and the object side surface of the sixth spacer element P6 along the optical axis, EP67 is the distance between the image side surface of the sixth spacer element P6 and the object side surface of the seventh spacer element P7 along the optical axis, and CP7 is the maximum thickness of the seventh spacer element P7 along the optical axis.

[0160] Table 11

[0161]

[0162] In summary, the optical imaging systems in Embodiments 1-9 satisfy the relationship shown in Table 12, as shown in Table 12.

[0163] Table 12

[0164]

[0165] It is worth mentioning that according to an aspect of the present application, one embodiment of the present application further provides a camera module which can include the optical imaging system and a photosensitive element described above, and the photosensitive element is arranged on the image side of the optical imaging system to image. It can be understood that the photosensitive element mentioned in the present application can be implemented as a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS), but is not limited thereto, and the present application will not be repeated here.

[0166] In addition, according to another aspect of the present application, one embodiment of the present application further provides an electronic device which can include the camera module and a processor, and the camera module is communicatively connected to the processor, and is used to acquire image data and input the image data to the processor to be processed. It can be understood that the electronic device mentioned in the present application can be implemented as a device such as a mobile phone installed with the camera module, but is not limited thereto, and the present application will not be repeated here.

[0167] The technical features of the above embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not contradict, they should be considered as the scope of the present application.

[0168] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the patent protection of the present application should be subject to the appended claims.

Claims

1. An optical imaging system characterized by, The first lens barrel and the second lens barrel are arranged in order from the object side to the image side along the optical axis direction; The first lens barrel sequentially comprises: a first lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is convex; a second lens with negative refractive power; A first spacing element is arranged between the first lens and the second lens, and abuts against the image side surface of the first lens; The second lens barrel sequentially comprises: a third lens with positive refractive power, the object side surface of which is convex; a fourth lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave; a fifth lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is convex; a sixth lens with negative refractive power, the object side surface of which is concave, and the image side surface of which is convex; a seventh lens with positive or negative refractive power, the object side surface of which is concave, and the image side surface of which is convex; an eighth lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave; A third spacing element is arranged between the third lens and the fourth lens, and abuts against the image side surface of the third lens; A fourth spacing element is arranged between the fourth lens and the fifth lens, and abuts against the image side surface of the fourth lens; A fifth spacing element is arranged between the fifth lens and the sixth lens, and abuts against the image side surface of the fifth lens; A sixth spacing element is arranged between the sixth lens and the seventh lens, and abuts against the image side surface of the sixth lens; A seventh spacing element is arranged between the seventh lens and the eighth lens, and abuts against the image side surface of the seventh lens; The optical imaging system also satisfies: 13.45 < (d4s+d4m) / T45 < 14.20; 1.90 < f345 / d5s < 2.40; wherein d4s is the inner diameter of the object side surface of the fourth spacing element, d4m is the inner diameter of the image side surface of the fourth spacing element, T45 is the air spacing of the fourth lens and the fifth lens on the optical axis, f345 is the combined focal length of the third lens, the fourth lens and the fifth lens, and d5s is the inner diameter of the object side surface of the fifth spacing element.

2. The optical imaging system of claim 1, wherein, The optical imaging system also satisfies: 5.06 ≤ D5s / CT5 ≤ 6.55; wherein D5s is the outer diameter of the object side surface of the fifth spacing element, and CT5 is the center thickness of the fifth lens on the optical axis.

3. The optical imaging system of claim 1, wherein, The optical imaging system also satisfies: 6.10 mm ≤ f × (La / Lb) ≤ 8.58 mm; wherein f is the effective focal length of the optical imaging system, La is the maximum height of the first lens barrel, and Lb is the maximum height of the second lens barrel.

4. The optical imaging system of claim 1, wherein, The optical imaging system also satisfies: 5.35 < das / (CT1+CT2) < 6.55; wherein das is the inner diameter of the object side surface of the first lens barrel, CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

5. The optical imaging system of claim 1, wherein, The optical imaging system also satisfies: -2.85 < R2 / (D1s+D1m) < -1.80; wherein R2 is a curvature radius of an image side surface of the first lens, D1s is an outer diameter of an object side surface of the first spacer element, and D1m is an outer diameter of an image side surface of the first spacer element.

6. The optical imaging system of claim 1, wherein, The optical imaging system also satisfies: 9.95 < Das / (EP01+CP1) < 16.75; wherein Das is an outer diameter of an object side surface of the first lens barrel, EP01 is a distance along an optical axis direction from the object side surface of the first lens barrel to the object side surface of the first spacer element, and CP1 is a maximum thickness of the first spacer element along the optical axis direction.

7. The optical imaging system of claim 1, wherein, The optical imaging system also satisfies: 0.98 ≤ R5 / dbs ≤ 1.40; wherein R5 is a curvature radius of an object side surface of the third lens, and dbs is an inner diameter of an object side surface of the second lens barrel.

8. The optical imaging system of claim 1, wherein, The optical imaging system also satisfies: 3.70 < d3s / (CT3+CT4) < 4.80; wherein d3s is an inner diameter of an object side surface of the third spacer element, CT3 is a central thickness of the third lens along an optical axis, and CT4 is a central thickness of the fourth lens along the optical axis.

9. The optical imaging system of claim 1, wherein, The optical imaging system also satisfies: -3.30 < f6 / (d6s+d6m) < -1.80; wherein f6 is an effective focal length of the sixth lens, d6s is an inner diameter of an object side surface of the sixth spacer element, and d6m is an inner diameter of an image side surface of the sixth spacer element.

10. The optical imaging system of claim 1, wherein, The optical imaging system also satisfies: -18.15 ≤ f678 / (EP67+CP7) ≤ -10.71; wherein f678 is a combined focal length of the sixth lens, the seventh lens, and the eighth lens, EP67 is a distance along an optical axis direction from an image side surface of the sixth spacer element to an object side surface of the seventh spacer element, and CP7 is a maximum thickness of the seventh spacer element along the optical axis direction.

11. The optical imaging system of claim 1, wherein, The optical imaging system also satisfies: -7.88 ≤ f4 / (CP3+EP34) ≤ -2.83; wherein f4 is an effective focal length of the fourth lens, CP3 is a maximum thickness of the third spacer element along an optical axis direction, and EP34 is a distance along the optical axis direction from an image side surface of the third spacer element to an object side surface of the fourth spacer element.

12. The optical imaging system of claim 1, wherein, The optical imaging system also satisfies: 2.90 ≤ Lb / (EP45+EP56) ≤ 4.43; wherein Lb is a maximum height of the second lens barrel, EP45 is a distance along an optical axis direction from an image side surface of the fourth spacer element to an object side surface of the fifth spacer element, and EP56 is a distance along the optical axis direction from an image side surface of the fifth spacer element to an object side surface of the sixth spacer element.

13. The optical imaging system of claim 1, wherein, The optical imaging system also satisfies: 1.75 ≤ (D7m-d7m) / CT8 ≤ 3.31; wherein D7m is an outer diameter of an image side surface of the seventh spacer element, d7m is an inner diameter of the image side surface of the seventh spacer element, and CT8 is a central thickness of the eighth lens along an optical axis.

14. The optical imaging system of claim 1, wherein, The optical imaging system also satisfies: 0.95 < dam / dbm < 1.60; wherein dam is an inner diameter of the first lens barrel image side surface, and dbm is an inner diameter of the second lens barrel image side surface.

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