Periscopic optical imaging system

Abstract

The present application relates to a periscopic optical imaging system, comprising a first lens barrel, a first lens group arranged in the first lens barrel, a second lens barrel, a second lens group arranged in the second lens barrel and a plurality of spacer elements, and a prism arranged between the first lens group and the second lens group, the optical axes of the first lens group and the second lens group being perpendicular to each other; the lens group comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens; the plurality of spacer elements comprises: a fifth spacer element and a sixth spacer element; the periscopic optical imaging system satisfies: 4.18≤CT1 / T12≤7.23; 1.00≤EP56 / (T56-CT5)≤2.05. The periscopic optical imaging system of the present application can balance optical path adaptation, structural stability and imaging quality, reduce aberration and improve structural reliability.

Description

Technical Field

[0001] This invention relates to the field of imaging lens technology, and more particularly to a periscope optical imaging system. Background Technology

[0002] As consumer electronic devices rapidly evolve towards thinner, lighter, and more integrated designs, periscope optical imaging systems have become the mainstream technology for telephoto camera modules in portable electronic devices such as smartphones, due to their ability to achieve long-focal-length imaging within a limited body thickness.

[0003] However, in the miniaturization process, existing periscope optical imaging systems generally suffer from technical bottlenecks that make it difficult to simultaneously achieve optical path adaptation, structural stability, and imaging quality. On the one hand, in order to reduce axial dimensions, most schemes excessively reduce the center thickness and air gap of the front lens group, resulting in uncontrolled light refraction gradient of the negative power first lens and a significant increase in primary aberrations such as spherical aberration and chromatic aberration. At the same time, unreasonable front group assembly spacing can easily lead to problems such as lens deformation, stray light introduction, or assembly edge collisions, failing to provide a stable and high-quality front optical path for the optical path turning of subsequent prisms. On the other hand, the high stacking density of the rear lens group and the lack of coordinated design in the optical spacing and spacing element layout between the fifth and sixth lenses cause abrupt changes in the light transmission angle after divergence by the negative power lens, resulting in the cumulative amplification of off-axis aberrations such as astigmatism and field curvature. Furthermore, the spacing elements do not reserve sufficient buffer space, making the lenses prone to collision damage under complex conditions such as drops and vibrations, resulting in insufficient system structural reliability.

[0004] In summary, existing technologies have not been able to effectively solve the aforementioned multi-objective trade-off problem, which restricts the overall performance and market application scope of periscope optical imaging systems. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention aims to provide a periscope optical imaging system that can coordinately constrain the parameters of the front and rear sections, take into account the optical path, structure and imaging quality, suppress aberrations and improve structural reliability.

[0006] To achieve the above-mentioned objective, the present invention provides a periscope optical imaging system, including a first lens barrel, a first lens group placed inside the first lens barrel, a second lens barrel, a second lens group placed inside the second lens barrel, and a plurality of spacer elements, as well as a prism disposed between the first lens group and the second lens group, wherein the optical axes of the first lens group and the second lens group are perpendicular to each other.

[0007] The first lens group includes, in sequence along the optical axis from the object side to the image side: a first lens with negative optical power and a second lens with positive optical power; the object side of the first lens is convex and the image side is concave.

[0008] The second lens group includes, in sequence along the optical axis from the object side to the image side: a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with optical power, and a seventh lens with optical power; the object side of the seventh lens is convex, and the image side is concave.

[0009] The first lens group and the second lens group contain a total of seven lenses with optical power;

[0010] The plurality of spacers includes: a first spacer located between the first lens and the second lens, and at least partially in contact with the image-side surface of the first lens; a third spacer located between the third lens and the fourth lens, and at least partially in contact with the image-side surface of the third lens; a fourth spacer located between the fourth lens and the fifth lens, and at least partially in contact with the image-side surface of the fourth lens; a fifth spacer located between the fifth lens and the sixth lens, and directly in contact with the image-side surface of the fifth lens; and a sixth spacer located between the sixth lens and the seventh lens, and directly in contact with the image-side surface of the sixth lens.

[0011] The periscope optical imaging system satisfies: 4.18≤CT1 / T12≤7.23;

[0012] 1.00≤EP56 / (T56-CT5)≤2.05;

[0013] Wherein, CT1 is the center thickness of the first lens, T12 is the air gap between the first lens and the second lens on the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, CT5 is the center thickness of the fifth lens, and EP56 is the distance between the fifth spacer element and the sixth spacer element along the optical axis.

[0014] According to one technical solution of the present invention, the periscope optical imaging system satisfies: 6.69 ≤ (D1s - d1s) / T12 ≤ 18.39;

[0015] Wherein, d1s is the inner diameter of the object side of the first spacer element, D1s is the outer diameter of the object side of the first spacer element, and T12 is the air gap between the first lens and the second lens on the optical axis.

[0016] According to one technical solution of the present invention, the periscope optical imaging system satisfies: 4.18≤(CT2-CT1) / T12≤6.24; 1.66≤CT2 / EP10≤1.97;

[0017] Wherein, T12 is the air gap between the first lens and the second lens on the optical axis, CT1 is the center thickness of the first lens, CT2 is the center thickness of the second lens, and EP10 is the distance along the optical axis from the image side of the first spacer element to the image side end face of the first lens barrel.

[0018] According to one technical solution of the present invention, the periscope optical imaging system satisfies: 1.92≤R4 / f2≤3.28; 5.42≤R3 / (CT2+CP1)≤6.29;

[0019] Wherein, f2 is the effective focal length of the second lens, CT2 is the center thickness of the second lens, CP1 is the maximum thickness of the first spacer element along the optical axis, R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

[0020] According to one technical solution of the present invention, the periscope optical imaging system satisfies: 2.38≤CT5 / (d4m-d5s)≤2.88;

[0021] Wherein, d4m is the inner diameter of the image side of the fourth spacer element, d5s is the inner diameter of the object side of the fifth spacer element, and CT5 is the center thickness of the fifth lens.

[0022] According to one technical solution of the present invention, the periscope optical imaging system satisfies: 8.68≤f4 / (EP34+CT4)≤12.65;

[0023] Wherein, CT4 is the center thickness of the fourth lens, EP34 is the distance between the third spacer element and the fourth spacer element along the optical axis, and f4 is the effective focal length of the fourth lens.

[0024] According to one technical solution of the present invention, the plurality of spacing elements further includes: a sixth auxiliary spacing element, disposed on the image side of the sixth spacing element and at least partially in contact with the sixth spacing element; and a sixth secondary auxiliary spacing element, disposed on the image side of the sixth auxiliary spacing element and at least partially in contact with the sixth auxiliary spacing element;

[0025] The periscope optical imaging system satisfies: 1.08≤T67 / CT7≤2.12, 4.12≤d6m / (CP6+CP6b+CP6c)≤5.36;

[0026] Wherein, CT7 is the center thickness of the seventh lens, T67 is the air gap between the sixth and seventh lenses on the optical axis, CP6 is the maximum thickness of the sixth spacer element along the optical axis, CP6b is the maximum thickness of the sixth auxiliary spacer element along the optical axis, CP6c is the maximum thickness of the sixth secondary auxiliary spacer element along the optical axis, and d6m is the inner diameter of the image side of the sixth spacer element.

[0027] According to one technical solution of the present invention, the periscope optical imaging system satisfies: 2.71≤R7 / CT3≤3.90; 2.09≤CP3 / (CT3-T34)≤5.19;

[0028] Wherein, CP3 is the maximum thickness of the third spacer element along the optical axis, CT3 is the center thickness of the third lens, T34 is the air gap between the third lens and the fourth lens on the optical axis, and R7 is the radius of curvature of the object side surface of the fourth lens.

[0029] According to one technical solution of the present invention, the periscope optical imaging system satisfies: 4.61≤CP3 / (CP4+T45)≤7.08;

[0030] Wherein, CP3 is the maximum thickness of the third spacer element along the optical axis, CP4 is the maximum thickness of the fourth spacer element along the optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

[0031] According to one technical solution of the present invention, the periscope optical imaging system satisfies: 1.52≤EP45 / SAG52≤1.93; 0.74≤SAG52 / CT5≤1.18;

[0032] Wherein, EP45 is the spacing distance between the fourth spacer element and the fifth spacer element along the optical axis, SAG52 is the axial distance between the intersection of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens, and CT5 is the center thickness of the fifth lens.

[0033] According to one technical solution of the present invention, the periscope optical imaging system satisfies: 10.04≤T23 / T34≤11.71; 62.20≤CP3 / CP4≤77.86;

[0034] Wherein, CP3 is the maximum thickness of the third spacer element along the optical axis, CP4 is the maximum thickness of the fourth spacer element along the optical axis, T23 is the air gap between the second lens and the third lens on the optical axis, and T34 is the air gap between the third lens and the fourth lens on the optical axis.

[0035] According to one technical solution of the present invention, the periscope optical imaging system satisfies: 3.20≤L01 / CT1≤3.70; 4.18≤CT1 / T12≤7.23;

[0036] Wherein, L01 is the maximum height of the first lens barrel, CT1 is the center thickness of the first lens, and T12 is the air gap between the first lens and the second lens on the optical axis.

[0037] According to one technical solution of the present invention, the periscope optical imaging system satisfies: 6.53≤d5m / (T56-CT6)≤7.08;

[0038] Wherein, d5m is the inner diameter of the image side of the fifth spacer element, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and CT6 is the center thickness of the sixth lens.

[0039] According to one technical solution of the present invention, the periscope optical imaging system satisfies: 3.63≤D02s / L01≤3.84;

[0040] Wherein, L01 is the maximum height of the first lens barrel, and D02s is the outer diameter of the object-side end face of the second lens barrel.

[0041] According to one technical solution of the present invention, the periscope optical imaging system satisfies: 6.23≤T23 / CT3≤8.57;

[0042] Wherein, CT3 is the center thickness of the third lens, and T23 is the air gap between the second lens and the third lens on the optical axis.

[0043] According to one technical solution of the present invention, the prism includes an incident surface, a reflecting surface, and an exiting surface, wherein the angle between the incident surface and the exiting surface is 90 degrees, and all three surfaces of the prism are planar.

[0044] The beneficial effects of this invention are:

[0045] The periscope optical imaging system of this application uses seven lenses with optical power and at least two spacer elements. By simultaneously controlling the ratio of the center thickness of the first lens to the air gap on the axis of the first and second lenses, and the ratio of the distance between the fifth and sixth spacer elements along the optical axis to the difference between the air gap on the axis of the fifth and sixth lenses and the center thickness of the fifth lens, the incident light is modulated by the negative optical power of the first lens to construct a gentle beam deflection gradient. This balances the assembly spacing and structural strength of the front lens group (first and second lenses), preventing deformation of the first lens due to excessive thinness. The first and second lenses are designed to prevent stray light from being introduced due to excessively wide air gaps on their axes, or assembly edge collisions caused by excessively narrow air gaps. This design provides a stable and high-quality front optical path for the subsequent prism's optical path redirection. The light beam, after being diverged by the negative optical power fifth lens, enters the sixth lens at a stable angle, effectively suppressing the cumulative amplification of off-axis aberrations such as astigmatism and field curvature. Combined with the optimized axial stacking configuration of the rear optical elements, the design provides better assembly positioning and sufficient buffer space for the rear lens group to absorb external impacts and prevent lens collision damage. This enhances the structural reliability of the system under complex operating conditions and ensures the imaging clarity in the near-image area. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the embodiments will be briefly described below.

[0047] Figure 1 A schematic diagram of the structural parameters of an optical imaging system according to the present invention is shown;

[0048] Figure 2 , Figure 3 and Figure 4 Schematic diagrams of optical imaging systems 1001, 1002, and 1003 according to Embodiment 1 of this application are shown respectively.

[0049] Figure 5 The on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of three optical imaging systems according to Embodiment 1 of this application are shown.

[0050] Figure 6 , Figure 7 and Figure 8 Schematic diagrams of optical imaging systems 2001, 2002, and 2003 according to Embodiment 2 of this application are shown respectively.

[0051] Figure 9 The on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of three optical imaging systems according to Embodiment 2 of this application are shown.

[0052] Figure 10 , Figure 11 and Figure 12 Schematic diagrams of optical imaging systems 3001, 3002 and 3003 according to Embodiment 3 of this application are shown respectively.

[0053] Figure 13 The on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of three optical imaging systems according to Embodiment 3 of this application are shown.

[0054] Figure 14 The MTF defocus curve of the optical imaging system in Example 1 is shown, where EP56 / (T56-CT5)=0.05 and CT1 / T12=3.85;

[0055] Figure 15 The MTF defocus curve of the optical imaging system in Example 2 is shown, where EP56 / (T56-CT5)=1.38 and CT1 / T12=6.26;

[0056] Figure 16 The MTF defocus curve of the optical imaging system in Example 3 is shown, where EP56 / (T56-CT5)=8.99 and CT1 / T12=10.00. Detailed Implementation

[0057] 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.

[0058] 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, or the first lens may also be referred to as the first lens element.

[0059] 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.

[0060] 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.

[0061] In the text, each lens has an optical region and a structural region on its object side or image side. The optical region refers to the area through which light passes, and the structural region refers to the area used for assembly.

[0062] like Figure 1 As shown, the periscope optical imaging system of an exemplary embodiment of the present invention includes two lens groups, comprising a total of seven lenses with optical power, which are sequentially arranged along the optical axis from the object side to the image side as follows: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with optical power, and a seventh lens with optical power. Each lens is independent of the others, and there is an air gap between each lens on the optical axis.

[0063] The plurality of spacer elements includes: a first spacer element located between the first lens and the second lens and in direct contact with the image-side surface of the first lens; a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image-side surface of the third lens; a fourth spacer element located between the fourth lens and the fifth lens and in at least partial contact with the image-side surface of the fourth lens; a fifth spacer element located between the fifth lens and the sixth lens and in at least partial contact with the image-side surface of the fifth lens; and a sixth spacer element located between the sixth lens and the seventh lens and in at least partial contact with the image-side surface of the sixth lens.

[0064] The lens group and multiple spacer elements are housed within the lens barrel, which includes an object-side end face, an image-side end face, an outer ring surface, and an inner ring surface. Along the optical axis of the periscope optical imaging system, the inner ring surface of the lens barrel is stepped.

[0065] In some embodiments of the present invention, the periscope optical imaging system may further include color filters for correcting color deviations and / or protective glass for protecting the photosensitive element located on the imaging surface.

[0066] The first aspect of this application provides a periscope optical imaging system, including a first lens barrel, a first lens group disposed within the first lens barrel, a second lens barrel, a second lens group disposed within the second lens barrel, and a plurality of spacer elements, and a prism disposed between the first lens group and the second lens group, wherein the optical axes of the first lens group and the second lens group are perpendicular to each other.

[0067] The first lens group comprises, sequentially from the object side to the image side along the optical axis: a first lens with negative optical power and a second lens with positive optical power;

[0068] The second lens group includes, in sequence along the optical axis from the object side to the image side: a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with optical power, and a seventh lens with optical power.

[0069] The first lens group and the second lens group contain a total of seven lenses with optical power;

[0070] The plurality of spacers include: a fifth spacer located between the fifth lens and the sixth lens and in direct contact with the image-side surface of the fifth lens; and a sixth spacer located between the sixth lens and the seventh lens and in direct contact with the image-side surface of the sixth lens.

[0071] The periscope optical imaging system satisfies: 4.18≤CT1 / T12≤7.23;

[0072] 1.00≤EP56 / (T56-CT5)≤2.05;

[0073] Wherein, CT1 is the center thickness of the first lens, T12 is the air gap between the first lens and the second lens on the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, CT5 is the center thickness of the fifth lens, and EP56 is the distance between the fifth spacer element and the sixth spacer element along the optical axis.

[0074] By simultaneously controlling the ratio of the center thickness of the first lens to the air gap on the axis of the first and second lenses, and the ratio of the distance between the fifth and sixth spacers along the optical axis to the difference between the air gap on the axis of the fifth and sixth lenses and the center thickness of the fifth lens, the incident light is modulated by the negative optical power of the first lens, constructing a gentle beam deflection gradient. This balances the assembly spacing and structural strength of the front group lenses (first and second lenses), preventing deformation of the first lens due to excessive thinness, and avoiding stray light introduced by excessively wide air gaps on the axis of the first and second lenses, or assembly edge collisions caused by excessively narrow air gaps. This provides a stable and high-quality front optical path for the optical path turning of the subsequent prism. The light beam diverged by the negative optical power fifth lens is incident on the sixth lens at a stable angle, effectively suppressing the cumulative amplification of off-axis aberrations such as astigmatism and field curvature. Combined with the optimized axial stacking configuration of the rear optical elements, it provides better assembly positioning and sufficient buffer space for the rear lens group to absorb external impacts and avoid lens collision damage, improving the structural reliability of the system under complex working conditions and ensuring the imaging clarity in the near-image area.

[0075] In Example 1, such as Figure 14 As shown, when EP56 / (T56-CT5)=0.05 and CT1 / T12=3.85, the lower limit specified in this application is exceeded. The optimal focus from the center field of view to the outer field of view gradually shifts towards the positive defocus direction, which cannot meet the design requirements of this application for the defocus characteristics and field curvature correction of the optical system.

[0076] In Example 2, such as Figure 15 As shown, when EP56 / (T56-CT5)=1.38 and CT1 / T12=6.26, within the range defined in this application, the defocus curve is relatively concentrated, the field curvature correction is excellent, and the lens MTF performance is good, which can meet the design requirements of this application for the defocus characteristics and field curvature correction of the optical system.

[0077] In Example 3, such as Figure 16 As shown, when EP56 / (T56-CT5)=8.99 and CT1 / T12=10.00, the upper limit is exceeded by the application. The optimal focus from the center field of view to the outer field of view gradually shifts towards the negative defocus direction, which cannot meet the design requirements of the application for the defocus characteristics and field curvature correction of the optical system.

[0078] In some embodiments of the present invention, the plurality of spacers further include: a first spacer element located between the first lens and the second lens, and in at least partial contact with the image side of the first lens;

[0079] The periscope optical imaging system satisfies: 6.69≤(D1s-d1s) / T12≤18.39; where d1s is the inner diameter of the object side of the first spacer element, D1s is the outer diameter of the object side of the first spacer element, and T12 is the air gap between the first lens and the second lens on the optical axis.

[0080] By controlling the ratio of the radial light-blocking width of the first spacer element to the air gap, stray light in the front optical path is intercepted, avoiding glare interference that affects image quality, ensuring the normal transmission of effective imaging light, improving image contrast and edge field brightness uniformity, optimizing the assembly compatibility between the spacer element and the lens, ensuring that the spacer element is stably supported within the space of the air gap between the first lens and the second lens on the optical axis, avoiding optical path offset caused by assembly deviation, and adapting to the positioning requirements of the front optical path of the periscope lens.

[0081] In some embodiments of the present invention, the plurality of spacers further include: a first spacer element located between the first lens and the second lens, and in at least partial contact with the image side of the first lens;

[0082] The periscope optical imaging system satisfies: 4.18≤(CT2-CT1) / T12≤6.24; 1.66≤CT2 / EP10≤1.97; where T12 is the air gap between the first lens and the second lens on the optical axis, CT1 is the center thickness of the first lens, CT2 is the center thickness of the second lens, and EP10 is the distance along the optical axis from the image side of the first spacer element to the image side end face of the first lens barrel.

[0083] By coordinating the thickness relationship between the first and second lenses, the air gap, and the assembly reference of the lens barrel, as well as the ratio of the center thickness of the second lens to the axial distance from the image side of the first spacer element to the image side end face of the first lens barrel, the axial positioning accuracy of the second lens within the lens barrel can be further enhanced, the support force distribution of the two lenses can be balanced, assembly eccentricity can be avoided, the consistency of batch assembly can be ensured, the stability and reliability of the front-end optical path can be guaranteed, and a high-quality foundation can be laid for subsequent prism turning and imaging processes.

[0084] In some embodiments of the present invention, the plurality of spacers further include: a first spacer element located between the first lens and the second lens, and in at least partial contact with the image side of the first lens;

[0085] The periscope optical imaging system satisfies: 1.92≤R4 / f2≤3.28; 5.42≤R3 / (CT2+CP1)≤6.29; where f2 is the effective focal length of the second lens, CT2 is the center thickness of the second lens, CP1 is the maximum thickness of the first spacer element along the optical axis, R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

[0086] By synergistically constraining the radius of curvature, effective focal length, and related structural parameters of the second lens, the core issues of optimizing the refractive performance and structural adaptation of the second lens are addressed. This ratio improves the fit between the lens and the spacer element, reduces the difficulty of lens manufacturing, minimizes stray light interference caused by structural gaps, and enhances the overall structure's resistance to deformation. Furthermore, it optimizes the light-gathering effect of the second lens, preventing excessive or insufficient light deflection, thus forming a synergistic refractive system with the first lens. This provides a smooth optical path for light entering the prism and reduces aberrations such as spherical aberration.

[0087] In some embodiments of the present invention, the plurality of spacers further include: a fourth spacer, located between the fourth lens and the fifth lens, and in at least partial contact with the image side of the fourth lens;

[0088] The periscope optical imaging system satisfies: 2.38≤CT5 / (d4m-d5s)≤2.88; where d4m is the inner diameter of the image side of the fourth spacer element, d5s is the inner diameter of the object side of the fifth spacer element, and CT5 is the center thickness of the fifth lens.

[0089] By satisfying the above relationships, the fifth lens can be ensured to have sufficient structural thickness to resist surface deformation caused by mechanical shock and temperature changes, thus guaranteeing the stable performance of negative optical power. This ratio matches the radial light transmission space requirements, avoiding weakened deflection control due to insufficient thickness, and preventing light truncation problems caused by light transmission space mismatch, providing stable optical path conditions for the subsequent aberration correction work of the sixth and seventh lenses. As a core component of the mid-to-rear optical path, the structure and light transmission adaptability of the fifth lens can directly improve the overall image quality.

[0090] In some embodiments of the present invention, the plurality of spacers further include: a third spacer located between the third lens and the fourth lens, and at least partially in contact with the image-side surface of the third lens; and a fourth spacer located between the fourth lens and the fifth lens, and at least partially in contact with the image-side surface of the fourth lens.

[0091] The periscope optical imaging system satisfies: 8.68≤f4 / (EP34+CT4)≤12.65; where CT4 is the center thickness of the fourth lens, EP34 is the distance between the third spacer element and the fourth spacer element along the optical axis, and f4 is the effective focal length of the fourth lens.

[0092] When the above relationships are satisfied, the positive optical power of the fourth lens can be matched with the surrounding structural layout, optimizing the light converging efficiency and avoiding image defocusing due to excessive or insufficient convergence. The sum of the spacing distance between the third and fourth spacers along the optical axis and the center thickness of the fourth lens reflects the total axial structural dimensions. This proportional constraint enables compact stacking of components, improving space utilization. Simultaneously, it enhances the structural rigidity and vibration resistance of the second lens barrel, reduces error amplification caused by the optical path turning of the periscope lens, ensures a stable light convergence path, and lays the foundation for subsequent lens collaboration.

[0093] In some embodiments of the present invention, the plurality of spacing elements further include: a sixth auxiliary spacing element disposed on the image side of the sixth spacing element and in at least partial contact with the sixth spacing element; and a sixth secondary auxiliary spacing element disposed on the image side of the sixth auxiliary spacing element and in at least partial contact with the sixth auxiliary spacing element.

[0094] The periscope optical imaging system satisfies: 1.08≤T67 / CT7≤2.12, 4.12≤d6m / (CP6+CP6b+CP6c)≤5.36; where CT7 is the center thickness of the seventh lens, T67 is the air gap between the sixth and seventh lenses on the optical axis, CP6 is the maximum thickness of the sixth spacer element along the optical axis, CP6b is the maximum thickness of the sixth auxiliary spacer element along the optical axis, CP6c is the maximum thickness of the sixth secondary auxiliary spacer element along the optical axis, and d6m is the inner diameter of the image-side surface of the sixth spacer element.

[0095] By coordinating the spacing between the sixth and seventh lenses and the structural ratio of the subsequent spacer elements, the core issues of light transmission stability and structural support reliability in the subsequent optical path are resolved. This ratio ensures smooth light transmission between the sixth and seventh lenses, preventing excessively long spacing from causing light to deviate from the preset path, or excessively short spacing from affecting aberration correction. It also reduces the risk of collision between the two lenses under mechanical shock, improving structural stability and further strengthening the subsequent structural support. The synergistic effect of multiple auxiliary spacer elements forms a rigid radial boundary, effectively intercepting stray light interference, improving assembly accuracy and mass production consistency, providing clear and uniform imaging conditions for the near-image plane, and ensuring overall optical performance.

[0096] In some embodiments of the present invention, the plurality of spacers further includes: a third spacer, located between the third lens and the fourth lens, and in at least partial contact with the image side of the third lens;

[0097] The periscope optical imaging system satisfies: 2.71≤R7 / CT3≤3.90; 2.09≤CP3 / (CT3-T34)≤5.19; where CP3 is the maximum thickness of the third spacer element along the optical axis, CT3 is the center thickness of the third lens, T34 is the air gap between the third lens and the fourth lens on the optical axis, and R7 is the radius of curvature of the object side surface of the fourth lens.

[0098] By coordinating the curvature radius, center thickness, and support parameters of the third lens, the core issue of refractive effect and structural fit of the third lens is addressed. This ratio balances the optical performance and structural strength of the third lens, optimizes the support effect of the third spacer element, ensures uniform support force for the third lens, improves the assembly stability of components within the second lens barrel, prevents lens eccentricity or deformation, helps suppress stray light interference, ensures stable light convergence, reduces aberrations such as spherical aberration and coma, avoids excessively steep incident angles due to excessively small curvature radius, or insufficient converging ability due to excessively large curvature radius, and ensures that the light transmission rhythm adapts to the needs of subsequent optical paths.

[0099] In some embodiments of the present invention, the plurality of spacers further include: a third spacer located between the third lens and the fourth lens, and at least partially in contact with the image-side surface of the third lens; and a fourth spacer located between the fourth lens and the fifth lens, and at least partially in contact with the image-side surface of the fourth lens.

[0100] The periscope optical imaging system satisfies: 4.61≤CP3 / (CP4+T45)≤7.08; where CP3 is the maximum thickness of the third spacer element along the optical axis, CP4 is the maximum thickness of the fourth spacer element along the optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

[0101] By satisfying the above relationships, the support strength of the third and fourth spacer elements can be balanced, ensuring precise axial positioning of the third to fifth lenses. This forms a stable, synergistic support structure, effectively improving the lens's vibration and shock resistance and fundamentally preventing axial displacement of the lenses. Simultaneously, this ratio indirectly optimizes the propagation rhythm of light between the third and fifth lenses, ensuring a smooth transition between light convergence and divergence and reducing aberration superposition. Combined with the dual-tube design of the periscope lens, this structural optimization significantly improves the overall structural integrity within the second tube, ultimately ensuring long-term stability of image quality.

[0102] In some embodiments of the present invention, the plurality of spacers further include: a fourth spacer, located between the fourth lens and the fifth lens, and in at least partial contact with the image side of the fourth lens;

[0103] The periscope optical imaging system satisfies: 1.52≤EP45 / SAG52≤1.93; 0.74≤SAG52 / CT5≤1.18; where EP45 is the spacing distance between the fourth spacer element and the fifth spacer element along the optical axis, SAG52 is the axial distance between the intersection of the image-side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image-side surface of the fifth lens, and CT5 is the center thickness of the fifth lens.

[0104] By synergistically constraining the surface parameters, center thickness, and spacing of the fifth lens, the core issues of light control and structural reliability of the fifth lens are resolved. This ratio balances the surface morphology and structural strength of the fifth lens, avoiding processing difficulties caused by excessively steep curvature or insufficient thickness. It ensures that the lens possesses excellent refractive properties and resistance to deformation. Combined with the negative optical power characteristics of the fifth lens, it optimizes the light divergence path, corrects off-axis aberrations, improves the imaging quality of the edge field of view, and ensures that light is transmitted to subsequent optical paths at a stable angle, providing a solid foundation for high-quality imaging of the entire optical imaging system.

[0105] In some embodiments of the present invention, the plurality of spacers further include: a third spacer located between the third lens and the fourth lens, and at least partially in contact with the image-side surface of the third lens; and a fourth spacer located between the fourth lens and the fifth lens, and at least partially in contact with the image-side surface of the fourth lens.

[0106] The periscope optical imaging system satisfies: 10.04≤T23 / T34≤11.71; 62.20≤CP3 / CP4≤77.86; where CP3 is the maximum thickness of the third spacer element along the optical axis, CP4 is the maximum thickness of the fourth spacer element along the optical axis, T23 is the air gap between the second lens and the third lens on the optical axis (equivalent axial gap along the folded optical path after prism turning), and T34 is the air gap between the third lens and the fourth lens on the optical axis.

[0107] By coordinating the optical path spacing and support ratio of the second lens group, the core issues of optical path transmission stability and structural stability in the middle and front sections are resolved. This ratio enhances the support strength gradient of the spacers, provides more sufficient support stiffness for the third lens through a high ratio, matches the structural stability requirements under the large air gap between the second and third lenses, balances the overall structural weight, avoids excessive redundancy, and improves the lens's resistance to external impacts. Combined with the optical path spacing layout of the second lens group, it matches the optical power characteristics of each lens to achieve gradual aberration correction, allowing light to smoothly transition from the converging state of the second lens to the synergistic refractive process of the third and fourth lenses, reducing aberration amplification caused by abrupt changes in the optical path, and ensuring the continuous stability of the middle and front sections of the optical path.

[0108] In some embodiments of the present invention, the periscope optical imaging system satisfies: 3.20≤L01 / CT1≤3.70; 4.18≤CT1 / T12≤7.23; where L01 is the maximum height of the first lens barrel, CT1 is the center thickness of the first lens, and T12 is the air gap between the first lens and the second lens on the optical axis.

[0109] When the above relationships are satisfied, the structural layout of the first lens barrel can be optimized, ensuring sufficient installation space and a stable support environment for the first lens. This avoids assembly interference due to insufficient barrel space, or lens positioning deviation caused by excessive space. It balances the requirements for miniaturization and structural stability of the lens barrel, ensuring sufficient rigidity to withstand external impacts. It provides axial positioning for the first lens, reducing optical path offset caused by barrel deformation, and providing stable forward optical path conditions for prism rotation.

[0110] In some embodiments of the present invention, the periscope optical imaging system satisfies: 6.53≤d5m / (T56-CT6)≤7.08; where d5m is the inner diameter of the image side of the fifth spacer element, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and CT6 is the center thickness of the sixth lens.

[0111] When the above relationships are satisfied, a stable radial boundary can be provided for the optical path between the fifth and sixth lenses, preventing radial deviation of light rays from affecting imaging accuracy. Matching the ratio of the inner diameter of the image-side surface of the fifth spacer element to the difference between the air gap on the axis of the fifth and sixth lenses and the center thickness of the sixth lens helps to form a suitable light-shielding structure, intercepting stray light and reducing near-image interference. Simultaneously, optimizing the fit between the spacer element and the lenses improves the stability of the subsequent optical path, ensuring that the positive optical power convergence effect of the sixth lens synergizes with the negative optical power divergence effect of the fifth lens, thereby improving image sharpness and contrast.

[0112] In some embodiments of the present invention, the periscope optical imaging system satisfies: 3.63≤D02s / L01≤3.84; where L01 is the maximum height of the first lens barrel and D02s is the outer diameter of the object-side end face of the second lens barrel.

[0113] While satisfying the above relationships, optimize the structural adaptability and mechanical balance of the periscope lens's dual-tube configuration to ensure a smooth structural transition at the connection point of the two tubes. Avoid stress concentration caused by dimensional imbalances, improve the overall structural rigidity of the lens, and, under the condition of coordinating positioning benchmarks and assembly processes, help maintain the designed perpendicular relationship of the optical axes of the two tubes, reducing optical path turning errors caused by structural deviations. Optimize the overall size layout while ensuring structural reliability, improve the adaptability to terminal equipment installation, and meet the needs of multiple usage scenarios.

[0114] In some embodiments of the present invention, the periscope optical imaging system satisfies: 6.23≤T23 / CT3≤8.57; where CT3 is the center thickness of the third lens, and T23 is the air gap between the second lens and the third lens on the optical axis (the equivalent axial gap along the folded optical path after the prism deflection).

[0115] When the above relationships are satisfied, matching the positive optical power characteristics of the second and third lenses, and the ratio of the on-axis air gap between the second and third lenses to the center thickness of the third lens, ensures that light rays converge smoothly from the second lens to the third lens, reducing aberrations and laying the foundation for subsequent lens-assisted refraction. Simultaneously, it provides sufficient assembly space and buffer distance for the third lens, preventing direct collisions between lenses under mechanical impact; and ensures uniform support of the spacer elements for the lenses, improving the structural stability and imaging performance of the front section of the second lens group, and extending the lens's lifespan.

[0116] In some embodiments of the present invention, the prism includes an incident surface, a reflecting surface, and an exiting surface, wherein the angle between the incident surface and the exiting surface is 90 degrees, and all three surfaces of the prism are planar.

[0117] The prism's structural design provides core support for the periscope lens's optical path redirection. The 90-degree angled incident and exit surfaces precisely match the vertical optical axis requirements of the two lens groups. The three-plane design reduces manufacturing complexity and assembly errors, ensuring the stability and predictability of the light transmission path. The incident surface efficiently receives incident light from the first lens group, while the reflecting surface achieves a 90-degree vertical redirection of the light, ensuring precise and error-free optical path deflection. The exit surface smoothly transmits the redirected light to the second lens group, providing a regular optical path for subsequent imaging. The overall structure is simple and reliable, reducing light loss and stray light generation during the deflection process, while also improving the lens's structural compactness, adapting to the miniaturization design requirements of periscope lenses.

[0118] In some embodiments of the present invention, the first lens and the second lens are located in front of the prism incident surface, and the third lens is located behind the prism exit surface, wherein the optical axes of the third lens are perpendicular to those of the first lens and the second lens.

[0119] This layout echoes the 90-degree optical path turning function of the prism, ensuring a perpendicular connection between the incident light paths of the first and second lenses and the receiving light path of the third lens. This guarantees that the light enters the second lens group without deviation after being reflected by the prism. The first and second lenses complete the initial convergence and aberration correction of the light before the incident light, laying a high-quality foundation for the optical path after turning. As the first core lens after the exit surface, the third lens receives the vertically turned light and establishes the refractive rhythm of the subsequent optical path. The vertical optical axis design maximizes the use of the lens barrel space, helping the periscope lens achieve a balance between long focal length and miniaturization, and avoiding optical path interference. At the same time, it clearly defines the functional division and spatial position of each lens, improving assembly accuracy and structural stability, reducing the risk of optical path deviation caused by vibration or temperature changes, and ensuring the consistency of overall image quality.

[0120] The periscope optical imaging system according to the above embodiments of this application can employ multiple lenses, such as the seven lenses mentioned above. By rationally allocating the optical power, surface shape, and arrangement of the spacers of each lens, the range of each lens-tube engagement is made more uniform, enhancing the light-gathering ability and improving the imaging quality of the periscope optical imaging system.

[0121] In some embodiments of the present invention, the lens material in the periscope optical imaging system provided by the present invention can be glass or plastic. When the lens material is plastic, production costs can be effectively reduced. Alternatively, when the lens material is glass, the low dispersion characteristic of glass itself can effectively correct the geometric chromatic aberration of the optical imaging system. The optical lens provided by the present invention can adopt an all-plastic lens structure, which not only gives the lens excellent imaging performance but also allows for a more compact lens structure, achieving a good balance between lens miniaturization and high image quality.

[0122] In some embodiments of the present invention, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens can be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce aberrations in the optical imaging system, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization. More specifically, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens of the present invention can all be aspherical lenses, which can effectively reduce aberrations in the optical lens, thereby reducing the number of lenses and the size of the lenses, and achieving lens miniaturization.

[0123] When an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equation:

[0124]

[0125] In the above formula, The height perpendicular to the optical axis is along the optical axis. The axial distance from the vertex to the surface at the location; This represents the curvature at the vertex of the aspherical surface. The conic coefficient; , , , , , , ...represent aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively.

[0126] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical imaging system differ; specific differences can be found in the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention. Furthermore, it should be noted that in Embodiment 1, there are three examples: optical imaging system 1001, optical imaging system 1002, and optical imaging system 1003; in Embodiment 2, there are three examples: optical imaging system 2001, optical imaging system 2002, and optical imaging system 2003; and in Embodiment 3, there are three examples: optical imaging system 3001, optical imaging system 3002, and optical imaging system 3003. The optical imaging systems in different examples have different structures, but the optical parameters of the optical imaging systems in the three examples in the same embodiment are the same, that is, the curvature radius, center thickness and other parameters of the first to fourth lenses, as well as the air gap and higher-order coefficients between the lenses on the optical axis are the same.

[0127] Example 1

[0128] The following is for reference Figures 2 to 5 The optical imaging system 1001, optical imaging system 1002 and optical imaging system 1003 according to Embodiment 1 of this application are described. Figure 2 , Figure 3 and Figure 4 Schematic diagrams of optical imaging systems 1001, 1002, and 1003 according to Embodiment 1 of this application are shown respectively.

[0129] In Embodiment 1, optical imaging systems 1001, 1002, and 1003 have the same optical parameters and different structural parameters. They all include a first lens barrel P01, a first lens group housed within the first lens barrel P0, a second lens barrel P02, a second lens group housed within the second lens barrel P02, multiple spacer elements, and a prism. The prism is disposed between the first lens barrel P01 and the second lens barrel P02. The lens group includes a first lens E1 to a seventh lens E7, wherein the first lens E1 and the second lens E2 are disposed within the first lens barrel P01, and the third lens E3 to the seventh lens E7 are disposed within the first lens barrel P02.

[0130] The plurality of spacers includes a first spacer P1, a third spacer P3, a third auxiliary spacer P3b, a fourth spacer P4, a fifth spacer P5, a fifth auxiliary spacer P5b, a fifth secondary auxiliary spacer P5c, a sixth spacer P6, a sixth auxiliary spacer P6b, and a sixth secondary auxiliary spacer P6c. The third auxiliary spacer P3b is located between the third spacer P3 and the fourth lens E4, and its object-side surface is at least partially in contact with the image-side surface of the third spacer P3. The fifth auxiliary spacer P5b is located between the fifth spacer P5 and the fifth secondary auxiliary spacer P5c, and its object-side surface is at least partially in contact with the image-side surface of the fifth spacer P5. The fifth auxiliary spacer element P5c is located between the fifth auxiliary spacer element P5b and the sixth lens E6, and the object side of the fifth auxiliary spacer element P5c is in at least partial contact with the image side of the fifth auxiliary spacer element P5b; the sixth auxiliary spacer element P6b is located between the sixth spacer element P6 and the sixth auxiliary spacer element P6c, and the object side of the sixth auxiliary spacer element P6b is in at least partial contact with the image side of the sixth spacer element P6; the sixth auxiliary spacer element P6c is located between the sixth auxiliary spacer element P6b and the seventh lens E7, and the object side of the sixth auxiliary spacer element P6c is in at least partial contact with the image side of the sixth auxiliary spacer element P6b; the positions of the remaining spacers have been described above and will not be repeated here.

[0131] In Embodiment 1, optical imaging systems 1001, 1002, and 1003 employ the same lens group, each containing four lenses, sequentially from the imaging side to the image source side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. A prism is positioned between the second lens E2 and the third lens E3. The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power. The object-side surface S3 of the first lens is convex, and the image-side surface S4 is concave; the third lens E3 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is concave; the fourth lens E4 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave; the fifth lens E5 has negative optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave; the sixth lens E6 has positive optical power, its object-side surface S13 is convex, and its image-side surface S14 is concave; the seventh lens E7 has positive optical power, its object-side surface S15 is convex, and its image-side surface S16 is concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on imaging surface S19 (not shown in the figure). Here, S5 and S6 are the incident and exit surfaces of the prism, S17 and S18 are the two surfaces of the protective glass or filter (not shown in the figure), OBJ (not shown in the figure) is the object surface, and STO (not shown in the figure) is the aperture stop, which is set on the object side of the first lens E1.

[0132] Table 1 lists the basic optical parameters of each lens in the optical imaging system of this embodiment, where the units of radius of curvature and thickness / distance are millimeters (mm).

[0133]

[0134] Table 1

[0135] Table 2 lists the higher-order coefficients of each aspherical lens in the optical imaging system of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 and A 20 .

[0136]

[0137] Table 2

[0138] Figure 5 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Embodiment 1 are shown. Figure 5 In (a), the on-axis chromatic aberration curve represents the deviation of the focal point of light of different wavelengths after passing through the lens; Figure 5 In (b), the astigmatic curves represent the curvature of the meridional image plane and the curvature of the sagittal image plane; Figure 5 In (c), the distortion curves represent the distortion magnitude values ​​corresponding to different image heights; Figure 5 In (d), the magnification chromatic aberration curve represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figure 5 As can be seen, the optical imaging system given in Example 1 can achieve good imaging quality.

[0139] Example 2

[0140] The following is for reference Figures 6 to 9 The optical imaging system 2001, optical imaging system 2002 and optical imaging system 2003 according to Embodiment 2 of this application are described. Figure 6 , Figure 7 and Figure 8 Schematic diagrams of optical imaging systems 2001, 2002 and 2003 according to Embodiment 2 of this application are shown respectively.

[0141] In Embodiment 2, optical imaging systems 2001, 2002, and 2003 have the same optical parameters and different structural parameters. They all include a first lens barrel P01, a first lens group housed within the first lens barrel P0, a second lens barrel P02, a second lens group housed within the second lens barrel P02, multiple spacer elements, and a prism. The prism is disposed between the first lens barrel P01 and the second lens barrel P02. The lens group includes a first lens E1 to a seventh lens E7, wherein the first lens E1 and the second lens E2 are disposed within the first lens barrel P01, and the third lens E3 to the seventh lens E7 are disposed within the first lens barrel P02.

[0142] The multiple spacer elements include a first spacer element P1, a third spacer element P3, a third auxiliary spacer element P3b, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a fifth secondary auxiliary spacer element P5c, a sixth spacer element P6, a sixth auxiliary spacer element P6b, and a sixth secondary auxiliary spacer element P6c. The positions of each spacer element have been described above and in Embodiment 1, and will not be repeated here.

[0143] In Embodiment 2, optical imaging systems 2001, 2002, and 2003 employ the same lens group, each containing four lenses, sequentially from the imaging side to the image source side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. A prism is positioned between the second lens E2 and the third lens E3. The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power. The object-side surface S3 of the first lens is convex, and the image-side surface S4 is concave; the third lens E3 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is concave; the fourth lens E4 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave; the fifth lens E5 has negative optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave; the sixth lens E6 has positive optical power, its object-side surface S13 is convex, and its image-side surface S14 is concave; the seventh lens E7 has negative optical power, its object-side surface S15 is convex, and its image-side surface S16 is concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on imaging surface S19 (not shown in the figure). Here, S5 and S6 are the incident and exit surfaces of the prism, S17 and S18 are the two surfaces of the protective glass or filter (not shown in the figure), OBJ (not shown in the figure) is the object surface, and STO (not shown in the figure) is the aperture stop, which is set on the object side of the first lens E1.

[0144] Table 3 lists the basic optical parameters of each lens in the optical imaging system of this embodiment, where the units of radius of curvature and thickness / distance are millimeters (mm).

[0145]

[0146] Table 3

[0147] Table 4 lists the higher-order coefficients of each aspherical lens in the optical imaging system of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 and A 20 .

[0148]

[0149] Table 4

[0150] Figure 9 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Embodiment 2 are shown. Figure 9 In (a), the on-axis chromatic aberration curve represents the deviation of the focal point of light of different wavelengths after passing through the lens; Figure 9 In (b), the astigmatic curves represent the curvature of the meridional image plane and the curvature of the sagittal image plane; Figure 9 In (c), the distortion curves represent the distortion magnitude values ​​corresponding to different image heights; Figure 9 In (d), the magnification chromatic aberration curve represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figure 9 It can be seen that the optical imaging system given in Example 2 can achieve good imaging quality.

[0151] Example 3

[0152] The following is for reference Figures 10 to 13 The optical imaging system 3001, optical imaging system 3002 and optical imaging system 3003 according to Embodiment 3 of this application are described. Figure 10 , Figure 11 and Figure 12 Schematic diagrams of optical imaging systems 3001, 3002 and 3003 according to Embodiment 3 of this application are shown respectively.

[0153] In Embodiment 3, optical imaging systems 3001, 3002, and 3003 have the same optical parameters and different structural parameters. They all include a first lens barrel P01, a first lens group housed in the first lens barrel P0, a second lens barrel P02, a second lens group housed in the second lens barrel P02, multiple spacer elements, and a prism. The prism is disposed between the first lens barrel P01 and the second lens barrel P02. The lens group includes a first lens E1 to a seventh lens E7, wherein the first lens E1 and the second lens E2 are disposed in the first lens barrel P01, and the third lens E3 to the seventh lens E7 are disposed in the first lens barrel P02.

[0154] The plurality of spacer elements includes a first spacer element P1, a third spacer element P3, a third auxiliary spacer element P3b, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a fifth secondary auxiliary spacer element P5c, a sixth spacer element P6, a sixth auxiliary spacer element P6b and a sixth secondary auxiliary spacer element P6c, and a seventh spacer element P7. The positions of the spacer elements other than the seventh spacer element P7 have been described above and in Embodiment 1, and will not be repeated here. The seventh spacer element P7 is located on the image side of the seventh lens E7 and is at least partially in contact with the image side of the seventh lens E7.

[0155] In Embodiment 3, optical imaging systems 3001, 3002, and 3003 employ the same lens group, each containing four lenses, sequentially from the imaging side to the image source side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. A prism is positioned between the second lens E2 and the third lens E3. The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fourth lens E4 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave; the fifth lens E5 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave; the sixth lens E6 has negative optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave; the seventh lens E7 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave; light from the object passes sequentially through each surface S1 to S16 and is finally imaged on the imaging surface S19 (not shown in the figure), where S5 and S6 are the incident and exit surfaces of the prism, S17 and S18 are the two surfaces of the protective glass or filter (not shown in the figure), OBJ (not shown in the figure) is the object surface, and STO (not shown in the figure) is the aperture stop, which is located on the object side of the first lens E1.

[0156] Table 5 lists the basic optical parameters of each lens in the optical imaging system of this embodiment, where the units of radius of curvature and thickness / distance are millimeters (mm).

[0157]

[0158] Table 5

[0159] Table 6 lists the higher-order coefficients of each aspherical lens in the optical imaging system of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 and A 20 .

[0160]

[0161] Table 6

[0162] Figure 13 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system of Embodiment 3 are shown. Figure 13 In (a), the on-axis chromatic aberration curve represents the deviation of the focal point of light of different wavelengths after passing through the lens; Figure 13 In (b), the astigmatic curves represent the curvature of the meridional image plane and the curvature of the sagittal image plane; Figure 13 In (c), the distortion curves represent the distortion magnitude values ​​corresponding to different image heights; Figure 13 In (d), the magnification chromatic aberration curve represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figure 13 As can be seen, the optical imaging system given in Example 3 can achieve good imaging quality.

[0163] In summary, the optical parameters of the optical imaging systems 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 in Examples 1 to 3 are shown in Table 7 below.

[0164]

[0165] Table 7

[0166] The structural parameters of the optical imaging systems 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 in Examples 1 to 3 are shown in Table 8 below, in millimeters (mm).

[0167]

[0168] Table 8

[0169] The optical imaging systems 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002, and 3003 in Examples 1 to 3 satisfy the relationships shown in Table 9.

[0170]

[0171] Table 9

[0172] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A periscope optical imaging system, comprising a first lens barrel, a first lens group disposed within the first lens barrel, a second lens barrel, a second lens group disposed within the second lens barrel, and a plurality of spacer elements, and a prism disposed between the first lens group and the second lens group, characterized in that, The optical axes of the first lens group and the second lens group are perpendicular to each other; The first lens group includes, in sequence along the optical axis from the object side to the image side: a first lens with negative optical power and a second lens with positive optical power; the object side of the first lens is convex and the image side is concave. The second lens group includes, in sequence along the optical axis from the object side to the image side: a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with optical power, and a seventh lens with optical power; the object side of the seventh lens is convex, and the image side is concave. The first lens group and the second lens group contain a total of seven lenses with optical power; The plurality of spacers includes: a first spacer located between the first lens and the second lens, and at least partially in contact with the image-side surface of the first lens; a third spacer located between the third lens and the fourth lens, and at least partially in contact with the image-side surface of the third lens; a fourth spacer located between the fourth lens and the fifth lens, and at least partially in contact with the image-side surface of the fourth lens; a fifth spacer located between the fifth lens and the sixth lens, and directly in contact with the image-side surface of the fifth lens; and a sixth spacer located between the sixth lens and the seventh lens, and directly in contact with the image-side surface of the sixth lens. The periscope optical imaging system satisfies: 4.18≤CT1 / T12≤7.23; 1.00≤EP56 / (T56-CT5)≤2.05; Wherein, CT1 is the center thickness of the first lens, T12 is the air gap between the first lens and the second lens on the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, CT5 is the center thickness of the fifth lens, and EP56 is the distance between the fifth spacer element and the sixth spacer element along the optical axis.

2. The periscope optical imaging system according to claim 1, characterized in that, The periscope optical imaging system satisfies: 6.69 ≤ (D1s - d1s) / T12 ≤ 18.39; Wherein, d1s is the inner diameter of the object side of the first spacer element, D1s is the outer diameter of the object side of the first spacer element, and T12 is the air gap between the first lens and the second lens on the optical axis.

3. The periscope optical imaging system according to claim 1, characterized in that, The periscope optical imaging system satisfies: 4.18≤(CT2-CT1) / T12≤6.24; 1.66≤CT2 / EP10≤1.97; Wherein, T12 is the air gap between the first lens and the second lens on the optical axis, CT1 is the center thickness of the first lens, CT2 is the center thickness of the second lens, and EP10 is the distance along the optical axis from the image side of the first spacer element to the image side end face of the first lens barrel.

4. The periscope optical imaging system according to claim 1, characterized in that, The periscope optical imaging system satisfies: 1.92≤R4 / f2≤3.28; 5.42≤R3 / (CT2+CP1)≤6.29; Wherein, f2 is the effective focal length of the second lens, CT2 is the center thickness of the second lens, CP1 is the maximum thickness of the first spacer element along the optical axis, R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

5. The periscope optical imaging system according to claim 1, characterized in that, The periscope optical imaging system satisfies: 2.38≤CT5 / (d4m-d5s)≤2.88; Wherein, d4m is the inner diameter of the image side of the fourth spacer element, d5s is the inner diameter of the object side of the fifth spacer element, and CT5 is the center thickness of the fifth lens.

6. The periscope optical imaging system according to claim 1, characterized in that, The periscope optical imaging system satisfies: 8.68≤f4 / (EP34+CT4)≤12.65; Wherein, CT4 is the center thickness of the fourth lens, EP34 is the distance between the third spacer element and the fourth spacer element along the optical axis, and f4 is the effective focal length of the fourth lens.

7. The periscope optical imaging system according to claim 1, characterized in that, The plurality of spacing elements further includes: a sixth auxiliary spacing element, disposed on the image side of the sixth spacing element and in at least partial contact with the sixth spacing element; and a sixth secondary auxiliary spacing element, disposed on the image side of the sixth auxiliary spacing element and in at least partial contact with the sixth auxiliary spacing element. The periscope optical imaging system satisfies: 1.08≤T67 / CT7≤2.12, 4.12≤d6m / (CP6+CP6b+CP6c)≤5.36; Wherein, CT7 is the center thickness of the seventh lens, T67 is the air gap between the sixth and seventh lenses on the optical axis, CP6 is the maximum thickness of the sixth spacer element along the optical axis, CP6b is the maximum thickness of the sixth auxiliary spacer element along the optical axis, CP6c is the maximum thickness of the sixth secondary auxiliary spacer element along the optical axis, and d6m is the inner diameter of the image side of the sixth spacer element.

8. The periscope optical imaging system according to claim 1, characterized in that, The periscope optical imaging system satisfies: 2.71≤R7 / CT3≤3.90; 2.09≤CP3 / (CT3-T34)≤5.19; Wherein, CP3 is the maximum thickness of the third spacer element along the optical axis, CT3 is the center thickness of the third lens, T34 is the air gap between the third lens and the fourth lens on the optical axis, and R7 is the radius of curvature of the object side surface of the fourth lens.

9. The periscope optical imaging system according to claim 1, characterized in that, The periscope optical imaging system satisfies: 4.61 ≤ CP3 / (CP4+T45) ≤ 7.08; Wherein, CP3 is the maximum thickness of the third spacer element along the optical axis, CP4 is the maximum thickness of the fourth spacer element along the optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

10. The periscope optical imaging system according to claim 1, characterized in that, The periscope optical imaging system satisfies: 1.52≤EP45 / SAG52≤1.93; 0.74≤SAG52 / CT5≤1.18; Wherein, EP45 is the spacing distance between the fourth spacer element and the fifth spacer element along the optical axis, SAG52 is the axial distance between the intersection of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens, and CT5 is the center thickness of the fifth lens.

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