Periscope lens

Abstract

The present application relates to a periscope lens, comprising a lens barrel and first to sixth lenses arranged in sequence from the object side to the image side of the lens barrel, a reflector is located between the first and second lenses, a supporting element group comprises a second supporting element abutting against the image side of the second lens and a third supporting element abutting against the image side of the third lens, the first lens has positive focal length, the focal lengths of the second lens and the third lens are positive and negative and different, the fourth lens and / or the fifth lens have positive focal length, the sixth lens has negative focal length, and in addition, the curvature radii R1 and R2 of the object side and the image side of the first lens, the refractive index N1 of the first lens, the image side outer diameter D3m of the third supporting element, the object side inner diameter d3s of the third supporting element, the image side outer diameter D2m of the second supporting element, and the object side inner diameter d2s of the second supporting element satisfy the following conditions: 1.25 <R1 / R2*N1≤1.5,1.05<(D3m‑d3s) / (D2m‑d2s)<2.70。

Description

Technical Field

[0001] The present invention relates to the technical field of periscope lenses, and in particular to a periscope lens. Background Art

[0002] In recent years, with the continuous advancement of technology and the continuous improvement of production capacity, the internal focusing periscope lens placed in the center of the reflector has gradually become the standard configuration of flagship mobile phones.

[0003] The lens in the lens usually includes a light-transmitting body with a radius of curvature and a non-light-transmitting body located outside the light-transmitting body. The light-transmitting bodies of multiple lenses constitute the structural body of the optical system, and the non-light-transmitting body is used to connect the lens barrel to fix the light-transmitting body. The non-light-transmitting body also has at least an object side surface, an image side surface, and an edge surface located at the outermost side of the entire lens. Anti-cutting chamfered surfaces are usually provided between the edge surface and the object side surface, and between the edge surface and the image side surface. For multiple lenses in the focusing lens group, the closer the lens is to the reflector, the easier it is for the light to receive light with a high incident angle, and thus the easier it is for the light to enter the non-light-transmitting body. When the light enters the non-light-transmitting body, it will inevitably be reflected on multiple inner surfaces (object side surface, image side surface, edge surface, chamfered surface) of the non-light-transmitting body. If the light finally emerges on the image side of the lens, it is easy to enter the picture together with the effective light used for imaging, and cause stray light visible to the naked eye to appear in the picture. Summary of the invention

[0004] Since the stray light problem in the imaging images of existing periscope lenses is quite serious, it is necessary to provide a periscope lens.

[0005] A periscope lens, comprising:

[0006] A first lens barrel having a first central axis;

[0007] a second lens barrel having a second central axis intersecting the first central axis;

[0008] A first lens group includes a first lens installed in the first lens barrel, the first lens has positive optical power, and an object side surface and an image side surface of the first lens are convex and concave respectively;

[0009] a second lens group, mounted on the second lens barrel, the second lens group comprising a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side end surface to the image side end surface of the second lens barrel and having a common optical axis, the object side surface of the second lens is a convex surface, the image side surface of the third lens is a concave surface, one of the second lens and the third lens has a positive optical power and the other has a negative optical power, the fourth lens and / or the fifth lens has a positive optical power, and the sixth lens has a negative optical power;

[0010] A mirror, located between the first lens and the second lens and arranged obliquely to the first central axis and the second central axis, for reflecting the light emitted from the image-side end face of the first lens barrel to the second lens; and

[0011] A supporting element group, including a second supporting element placed on the image side of the second lens and abutting against the image-side surface of the second lens, and a third supporting element placed on the image side of the third lens and abutting against the image-side surface of the third lens;

[0012] Among the object-side curvature radius R1 of the first lens, the image-side curvature radius R2 of the first lens, the refractive index N1 of the first lens, the image-side outer diameter D3m of the third supporting element, the object-side inner diameter d3s of the third supporting element, the image-side outer diameter D2m of the second supporting element, and the object-side inner diameter d2s of the second supporting element, the following conditions are satisfied:

[0013] 1.25 < R1 / R2 * N1 ≤ 1.5; and

[0014] 1.05 < (D3m - d3s) / (D2m - d2s) < 2.70.

[0015] With such a setting, in the present application, a mirror is placed between the first lens and the second lens to realize the function of redirecting the optical path in the periscope lens. By limiting the object-side curvature radius, the image-side curvature radius, and the refractive index of the first lens through the above conditional formula, the light input amount is ensured, and the imaging picture quality is guaranteed. The material of the first lens and the surface shapes on the object and image sides affect the optical path between the first lens, the mirror, and the second lens. Especially under the limitation of this conditional formula, light is likely to be reflected twice on the inner and outer surfaces of the second lens and the third lens. When light enters the structural area (non-light-transmitting main body) at the edge of the lens, stray light is likely to be generated. Based on this, by restricting the inner diameter dimensions of the second supporting element and the third supporting element, the internal reflection stray light generated by the second lens and the third lens can be blocked, thereby reducing the stray light risk and improving the picture quality.

[0016] In one embodiment, the second lens barrel is slidably arranged on the image side of the first lens barrel along the optical axis, and the object distance range of the periscope lens is from infinity to 150 mm.

[0017] In one embodiment, among the effective focal length fa of the periscope lens in the infinity state, the axial distance Y1 from the intersection of the object-side surface of the first lens and the optical axis to the reflecting surface of the mirror, the axial distance X2 from the object-side surface of the second lens to the image-side surface of the sixth lens, and the maximum length X of the periscope lens along the second central axis, the following conditions are satisfied: 0.65 < fa / (X2 + Y1) < 0.73, 19.45 mm < X < 21.40 mm.

[0018] In one embodiment, the maximum thickness B1 of the first lens barrel and the maximum thickness B2 of the object side end surface of the second lens barrel satisfy: 1.00 mm <B1+B2≤1.45mm。

[0019] In one embodiment, the distance EP02 from the object side end face of the second lens barrel to the object side face of the second supporting element along the optical axis, the spacing distance EP23 between the second supporting element and the third supporting element along the optical axis, the center thickness CT2 of the second lens, and the center thickness CT3 of the third lens satisfy the following: 0.90<(EP02+EP23) / (CT2+CT3)<1.20.

[0020] In one embodiment, the spacing distance EP23 between the second supporting element and the third supporting element along the optical axis, the center thickness CT3 of the third lens, the axial air gap T23 between the second lens and the third lens, and the maximum thickness CP2 of the second supporting element satisfy: 3.95 <EP23 / CT3+T23 / CP2≤11.20。

[0021] In one embodiment, the supporting element group further includes a fourth supporting element disposed on the image side of the fourth lens and abutting against the image side surface of the fourth lens;

[0022] The object side inner diameter d2s of the second supporting element, the object side outer diameter D4s of the fourth supporting element, and the image side inner diameter d2m of the second supporting element satisfy: 2.85 <d2s / (D4s-d2m)<3.50。

[0023] In one embodiment, the supporting element group further includes a fifth supporting element disposed on the image side of the fifth lens and abutting against the image side surface of the fifth lens;

[0024] The image side outer diameter D5m of the fifth supporting element, the object side inner diameter d5s of the fifth supporting element, the image side outer diameter D4m of the fourth supporting element, and the object side inner diameter d4s of the fourth supporting element satisfy: 0.70<(D5m-d5s) / (D4m-d4s)<1.65.

[0025] In one embodiment, the maximum height Lb of the second lens barrel along the second central axis, the spacing distance EP34 between the third supporting element and the fourth supporting element along the optical axis, and the spacing distance EP45 between the fourth supporting element and the fifth supporting element along the optical axis satisfy: 2.05 <Lb / (EP34+EP45)<3.30。

[0026] In one embodiment, the combined focal length f45 of the fourth lens and the fifth lens, the image side inner diameter d5m of the fifth supporting element, and the image side inner diameter d3m of the third supporting element satisfy: 35.2≤f45 / |d5m-d3m|≤46.15.

[0027] In one embodiment, the object side inner diameter d4s of the fourth supporting element, the object side inner diameter d5s of the fifth supporting element, the refractive index N4 of the fourth lens, and the refractive index N5 of the fifth lens satisfy the following relationship: 3.10mm<(d4s+d5s) / (N4+N5)<3.80mm.

[0028] In one embodiment, the distance EP34 between the third supporting element and the fourth supporting element along the optical axis and the center thickness CT4 of the fourth lens satisfy: 0.95 <EP34 / CT4≤1.20。

[0029] In one embodiment, the on-axis air gap T23 between the second lens and the third lens, the on-axis air gap T34 between the third lens and the fourth lens, the sum of the maximum thicknesses ∑CP2 of all supporting elements between the second lens and the third lens, and the sum of the maximum thicknesses ∑CP3 of all supporting elements between the third lens and the fourth lens satisfy the following: 3.05<(T23+T34) / (∑CP2+∑CP3)≤16.75. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the optical path when the periscope lens satisfies R1 / R2*N1=1.28、(D3m-d3s) / (D2m-d2s)=1.01;

[0031] Figure 2 Schematic diagram of the optical path when the periscope lens satisfies R1 / R2*N1=1.28、(D3m-d3s) / (D2m-d2s)=3.20;

[0032] Figure 3 A schematic diagram of the optical path in a periscope lens provided in the present application;

[0033] Figure 4A for Figure 3 A schematic diagram showing the size markings of the first lens barrel, the first lens and the reflector in the periscope lens;

[0034] Figure 4B for Figure 3 A schematic diagram showing the size markings of the second lens barrel, the second lens group and the supporting element group in the periscope lens;

[0035] Figure 4C for Figure 3 A schematic diagram of the size markings of the periscope lens shown;

[0036] Figure 5A Schematic diagram of the structure of the periscope lens in working condition 1-1 when the object distance is infinite;

[0037] Figure 5B Schematic diagram of the structure of the periscope lens in working condition 1-1 when the object distance is 150 mm;

[0038] Fig. 6A Schematic diagrams of the structures of the periscope lens in working conditions 1-2 when the object distance is infinite;

[0039] Figure 6B Schematic diagram of the structure of the periscope lens in working conditions 1-2 when the object distance is 150 mm;

[0040] Fig. 7A Schematic diagrams of the structures of the periscope lens in working conditions 1-3 when the object distance is infinite;

[0041] Figure 7B Schematic diagram of the structure of the periscope lens in working conditions 1-3 when the object distance is 150 mm;

[0042] Fig. 8A is an astigmatism curve diagram of the periscope lens in Example 1 when the object distance is infinite;

[0043] Figure 8B is a distortion curve diagram of the periscope lens in Example 1 when the object distance is infinite;

[0044] Fig. 9A Schematic diagram of the structure of the periscope lens in working condition 2-1 when the object distance is infinite;

[0045] Fig. 9B Schematic diagram of the structure of the periscope lens in working condition 2-1 when the object distance is 150 mm;

[0046] Fig. 10A Schematic diagram of the structure of the periscope lens in working condition 2-2 when the object distance is infinite;

[0047] Fig. 10B Schematic diagram of the structure of the periscope lens in working condition 2-2 when the object distance is 150 mm;

[0048] Fig.11A Schematic diagrams of the structures of the periscope lens in working conditions 2-3 when the object distance is infinite;

[0049] Fig. 11B Schematic diagram of the structure of the periscope lens in working conditions 2-3 when the object distance is 150 mm;

[0050] Fig. 12A is an astigmatism curve diagram of the periscope lens in Example 2 when the object distance is infinite;

[0051] Fig. 12B is a distortion curve diagram of the periscope lens in Example 2 when the object distance is infinite;

[0052] Fig.13A Schematic diagram of the structure of the periscope lens in working condition 3-1 when the object distance is infinite;

[0053] Fig. 13B Schematic diagram of the structure of the periscope lens in working condition 3-1 when the object distance is 150 mm;

[0054] Fig.14A Schematic diagram of the structure of the periscope lens in working condition 3-2 when the object distance is infinite;

[0055] Fig. 14B Schematic diagram of the structure of the periscope lens in working condition 3-2 when the object distance is 150 mm;

[0056] Fig.15A Schematic diagram of the structure of the periscope lens in working condition 3-3 when the object distance is infinite;

[0057] Fig. 15B Schematic diagram of the structure of the periscope lens in working condition 3-3 when the object distance is 150 mm;

[0058] Fig.16A is an astigmatism curve diagram of the periscope lens in Example 3 when the object distance is infinite;

[0059] Fig. 16B is a distortion curve diagram of the periscope lens in Example 3 when the object distance is infinite;

[0060] Fig.17A This is the test spot diagram when the periscope lens meets R1 / R2*N1=1.28, (D3m-d3s) / (D2m-d2s)=1.01;

[0061] Fig. 17B This is the test spot diagram when the periscope lens meets R1 / R2*N1=1.28, (D3m-d3s) / (D2m-d2s)=1.08;

[0062] Fig. 17C This is the test spot diagram when the periscope lens meets R1 / R2*N1=1.28 and (D3m-d3s) / (D2m-d2s)=3.20.

[0063] Reference numerals:

[0064] P01, first lens barrel; P02, second lens barrel; E1, first lens; E2, second lens; E3, third lens; E4, fourth lens; E5, fifth lens; E6, sixth lens; P2, second supporting element; P3, third supporting element; P4, fourth supporting element; P5, fifth supporting element; P3b, third auxiliary supporting element; P3c, third auxiliary supporting element; P4b, fourth auxiliary supporting element; P4c, fourth auxiliary supporting element. DETAILED DESCRIPTION

[0065] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0066] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0067] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0070] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0071] In recent years, with the continuous advancement of technology and the continuous improvement of production capacity, the internal focusing periscope lens placed in the center of the reflector has gradually become the standard configuration of flagship mobile phones.

[0072] The lens in the lens usually includes a light-transmitting body and a non-light-transmitting body located outside the light-transmitting body. The light-transmitting bodies of multiple lenses constitute the structural body of the optical system, and the non-light-transmitting body is used to connect the lens barrel to fix the light-transmitting body. The non-light-transmitting body also has at least an object side surface, an image side surface, and an edge surface located at the outermost side of the entire lens. Anti-cutting chamfered surfaces are usually provided between the edge surface and the object side surface, and between the edge surface and the image side surface. For multiple lenses in the focusing lens group, the closer the lens is to the reflector, the easier it is for the light to receive light with a high incident angle, and thus the easier it is for the light to enter the non-light-transmitting body. When the light enters the non-light-transmitting body, it will inevitably be reflected on multiple inner surfaces (object side surface, image side surface, edge surface, chamfered surface) of the non-light-transmitting body. If the light finally emerges on the image side of the lens, it is easy to enter the picture together with the effective light used for imaging, and cause stray light visible to the naked eye to appear in the picture.

[0073] Based on this, it is necessary to provide a periscope lens that can eliminate stray light caused by internal reflection at the edge of the lens.

[0074] See also Figure 3 , Figure 4A , Figure 4B , Figure 4C , Figure 3 This is a schematic diagram of the structure of a periscope lens in an embodiment of the present invention. Figure 4A for Figure 3The schematic diagram of the size markings of the first lens barrel P01, the first lens E1 and the reflector Rm in the periscope lens shown in FIG. Figure 4B for Figure 3 The schematic diagram of the size markings of the second lens barrel P02, the second lens group and the supporting element group in the periscope lens shown in FIG. Figure 4C for Figure 3 The size marking diagram of the periscope lens shown is worth noting that in addition to Figure 4C In addition to the X representing the length of the periscope lens, Y and X in the other figures represent the extension directions of the first central axis and the second central axis respectively. The periscope lens provided in the present application includes two lens barrels, six lenses, a reflector and a plurality of supporting elements:

[0075] The first lens barrel P01 has a first central axis;

[0076] The second lens barrel P02 has a second central axis intersecting the first central axis. The present application adopts an embodiment in which the first central axis and the second central axis are perpendicular to each other for illustration;

[0077] The first lens group includes a first lens E1 mounted on the first lens barrel P01, the first lens E1 has positive refractive power, and the object side surface and the image side surface of the first lens E1 are convex and concave respectively;

[0078] The second lens group is installed on the second lens barrel P02, including a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 which are arranged in sequence from the object side end surface to the image side end surface of the second lens barrel P02 and have a common optical axis, the object side surface of the second lens E2 is a convex surface, the image side surface of the third lens E3 is a concave surface, one of the second lens E2 and the third lens E3 has a positive focal power and the other has a negative focal power, the fourth lens E4 and / or the fifth lens E5 has a positive focal power, the sixth lens E6 has a negative focal power, and the outer edges of the second lens E2 to the sixth lens E6 abut against the step surface of the second lens barrel P02 to increase the stability of the connection between the lens and the lens barrel;

[0079] The reflector Rm is located between the first lens E1 and the second lens E2 and is arranged to be inclined to the first central axis and the second central axis, and is used to reflect the light emitted through the image side end surface of the first lens barrel P01 to the second lens E2;

[0080] The supporting element group includes four supporting elements from the second to the fifth, the second supporting element P2 is disposed on the image side of the second lens E2 and abuts against the image side surface of the second lens E2, the third supporting element P3 is disposed on the image side of the third lens E3 and abuts against the image side surface of the third lens E3, the fourth supporting element P4 is disposed on the image side of the fourth lens E4 and abuts against the image side surface of the fourth lens E4, and the fifth supporting element P5 is disposed on the image side of the fifth lens E5 and abuts against the image side surface of the fifth lens E5;

[0081] To solve the problem of stray light in the picture caused by light reflection at the edge of the lens in the periscope lens, the following conditions are satisfied among the object-side curvature radius R1 of the first lens E1, the image-side curvature radius R2 of the first lens E1, the refractive index N1 of the first lens E1, the image-side outer diameter D3m of the third supporting element P3, the object-side inner diameter d3s of the third supporting element P3, the image-side outer diameter D2m of the second supporting element P2, and the object-side inner diameter d2s of the second supporting element P2:

[0082] 1.25 < R1 / R2 * N1 ≤ 1.5; and

[0083] 1.05 < (D3m - d3s) / (D2m - d2s) < 2.70.

[0084] In this application, a reflector Rm is placed between the first lens E1 and the second lens E2 to achieve the function of redirecting the optical path in the periscope lens. By the above conditional formula (1), the object-side curvature radius, the image-side curvature radius, and the refractive index of the first lens E1 are limited and constrained, ensuring the light input amount and guaranteeing the imaging quality. The material of the first lens (usually made of glass material) and the surface profiles on the object and image sides affect the optical path between the first lens E1, the reflector Rm, and the second lens E2. Especially under the limitation of the conditional formula (1), light is likely to be reflected twice on the inner and outer surfaces of the second lens E2 and the third lens E3. When light enters the structural area (non-transmissive main body) at the edge of the lens, stray light is likely to be generated. Specifically, as Figure 1 and Figure 2 shown, Figure 1 FIG. [X] is a schematic diagram of the lens optical path when the first lens E1, the second supporting element P2, and the third supporting element P3 satisfy the conditions of R1 / R2 * N1 = 1.28 and (D3m - d3s) / (D2m - d2s) = 1.01; Figure 2 FIG. [Y] is a schematic diagram of the lens optical path when the first lens E1, the second supporting element P2, and the third supporting element P3 satisfy R1 / R2 * N1 = 1.28 and (D3m - d3s) / (D2m - d2s) = 3.20. As shown in the optical path diagram in Figure 1 , when the conditional formula (2) exceeds the lower limit, after light enters the third lens E3, it will be reflected multiple times on the inner surface in the non-lens main body of the third lens E3, and finally will exit from the image side surface of the third lens E3 and enter the picture; as Figure 2As shown in the optical path diagram, when conditional expression 2 exceeds the upper limit, the light is reflected on the image side of the second lens E2 and enters the non-light-transmitting body of the second lens E2. After multiple reflections, it will eventually be emitted from the image side of the second lens E2 and arrive at the photosensitive chip behind the lens together with the effective light in the lens. The above-mentioned effective light is the light that passes through the light-transmitting bodies of the first lens E1 to the sixth lens E6 in sequence and does not reflect between the lenses. In response to the problem of internal reflection stray light, the present application further blocks the generation and further transmission of the internal reflection stray light by constraining the relationship between the inner diameters on both sides of the object image of the second supporting element P2 and the inner diameters on both sides of the object image of the third supporting element P3, ensuring that the light in the lens can only pass through the light-transmitting bodies of the second lens and the third lens in sequence and reach the photosensitive chip, thereby reducing the risk of stray light and improving image quality.

[0085] See also Figures 17A to 17C , Fig.17A and Fig. 17C They are Figure 1 and Figure 2 The test spot diagram of the periscope lens shown. Fig. 17B This is the test spot diagram when the periscope lens meets R1 / R2*N1=1.28、(D3m-d3s) / (D2m-d2s)=1.08. By comparison, Fig. 17B The number of stray light spots in the test spot diagram shown is significantly less than Fig.17A and Fig. 17C Therefore, when the size of the periscope lens is designed according to the two conditional formulas provided in this application, the stray light in the test spot diagram is less while ensuring the brightness of the picture, and the imaging quality is better.

[0086] Optionally, in an embodiment provided in the present application, the second lens barrel P02 is slidably disposed on the image side of the reflector Rm along the optical axis and the object distance range of the periscope lens is from infinity to 150 mm. By adjusting the distance between the second lens barrel P02 and the reflector R and the first lens barrel P01, the distance between the first lens E1 and the second lens E2 on the optical axis is adjusted to adjust the focal length of the entire periscope lens, thereby completing the internal focusing function of the system. Specifically, the second lens barrel P02 has an outer annular surface and an inner annular surface, wherein the inner annular surface is stepped for correspondingly contacting with each lens, thereby increasing the stability of the second lens group installation, and the outer annular surface is provided with a microstructure for connecting with an external driving mechanism.

[0087] Optionally, in an embodiment provided by the present application, the effective focal length fa of the periscope lens in the infinite distance state, the axial distance Y1 from the intersection of the object side surface of the first lens E1 and the optical axis to the reflecting surface of the reflecting mirror Rm, the axial distance X2 from the object side surface of the second lens E2 to the image side surface of the sixth lens E6, and the maximum length X of the periscope lens along the second central axis satisfy: 0.65 < fa / (X2 + Y1) < 0.73, 19.45 mm < X < 21.40 mm. On the premise that the effective focal length f of the optical system meets the design specification requirements, light is incident through the first lens E1, and the optical path is changed through the reflecting mirror Rm. At the same time, the second lens barrel P02 realizes zooming to the infinite distance state through the displacement in the optical axis direction. At this time, it is necessary to satisfy 0.65 < fa / (X2 + Y1) < 0.73. This conditional formula can ensure the stability of the gap change of each lens group and ensure the mechanical reliability of the system. At the same time, the maximum length needs to satisfy 19.45 mm < X < 21.40 mm, making the lens tend to a miniaturized design, reducing the lens mass and the space occupation ratio of the lens in the opto-mechanical structure.

[0088] Optionally, in an embodiment provided by the present application, the maximum thickness B1 of the first lens barrel P01 and the maximum thickness B2 of the object side end surface of the second lens barrel P02 satisfy: 1.00 mm < B1 + B2 ≤ 1.45 mm. By controlling the total thickness of the object side end surface of the first lens barrel P01 and the second lens barrel P02, on the one hand, it provides a certain safety buffer space for the two lens groups (the first lens group is the first lens E1, and the second lens group is the second lens E2 to the sixth lens E6) during the zooming process (especially when the group gap is the smallest), preventing the second lens group from colliding between groups under the action of vibration, impact force, etc., that is, B1 + B2 ≤ 1.45; secondly, this thickness dimension is the bearing dimension during the lens assembly process, and B1 + B2 must satisfy > 1 to ensure the stability of the assembly of each lens during the assembly process, preventing component deformation after assembly caused by too small a lens barrel thickness, affecting the imaging quality and reliability performance of the lens.

[0089] Optionally, in an embodiment provided by the present application, the axial distance EP02 from the object side end surface of the second lens barrel P02 to the object side surface of the second bearing element P2, the axial distance EP23 between the second bearing element P2 and the third bearing element P3, the central thickness CT2 of the second lens E2, and the central thickness CT3 of the third lens E3 satisfy: 0.90 < (EP02 + EP23) / (CT2 + CT3) < 1.20. Through the constraint of this conditional formula, it can ensure that the thickness ratio and surface profile of the centers of the two lenses, the second lens E2 and the third lens E3, respectively, meet the existing processing design requirements of the lenses, control the overall surface curvature of the lenses within the range of the forming process requirements, improve the processing stability, and ensure the imaging quality of the lens.

[0090] Optionally, in an embodiment provided by the present application, the spacing distance EP23 between the second supporting element P2 and the third supporting element P3 along the optical axis direction, the central thickness CT3 of the third lens E3, the on-axis air gap T23 between the second lens E2 and the third lens E3, and the maximum thickness CP2 of the second supporting element P2 satisfy: 3.95 < EP23 / CT3 + T23 / CP2 ≤ 11.20. By restricting the non-transmissive main body thickness (equivalent to EP23) and the central thickness of the third lens E3, the lens thickness ratio is controlled within a certain range, reducing the risk in the molding process of the lens, thereby avoiding stray light and performance problems caused by poor lens processing. At the same time, the thickness of the second supporting element P2 can be adjusted through this conditional formula to change the air gap between the second lens E2 and the third lens E3, realizing the adjustment of the field curvature of the lens, compensating for the deviation value between actual production and design, so as to obtain a higher on-axis MTF value and improve the optical performance.

[0091] Optionally, in an embodiment provided by the present application, the object-side inner diameter d2s of the second supporting element P2, the object-side outer diameter D4s of the fourth supporting element P4, and the image-side inner diameter d2m of the second supporting element P2 satisfy: 2.85 < d2s / (D4s - d2m) < 3.50. Both the second supporting element P2 and the fourth supporting element P4 can use light-shielding materials. Through the constraint of this conditional formula, not only can the designed illuminance of the optical system be satisfied, but also the inner diameter design of the supporting element limits the incident range of light in this system, effectively blocking the stray light paths generated by reflection of each lens and eliminating the light rays with poor edge quality, reducing aberration, and thus obtaining a better shooting effect.

[0092] Optionally, in an embodiment provided by the present application, the image-side outer diameter D5m of the fifth supporting element P5, the object-side inner diameter d5s of the fifth supporting element P5, the image-side outer diameter D4m of the fourth supporting element P4, and the object-side inner diameter d4s of the fourth supporting element P4 satisfy: 0.70 < (D5m - d5s) / (D4m - d4s) < 1.65. Both the fourth supporting element P4 and the fifth supporting element P5 can use light-shielding materials. By setting the ratio of the inner diameters of the above-mentioned supporting elements, the internal reflection stray light path generated by the fifth lens E5 can be effectively blocked, controlling the incident trend of effective light, and enabling the lens to obtain better imaging quality. At the same time, the reasonable setting of the adjacent two supporting elements of the lens to support the non-transmissive main body at the edge of the lens can also absorb part of the energy when the lens is impacted or vibrated, playing a certain protective role.

[0093] Optionally, in an embodiment provided by the present application, the maximum height Lb of the second lens barrel P02 along the second central axis, the distance EP34 between the third bearing element P3 and the fourth bearing element P4 along the optical axis direction, and the distance EP45 between the fourth bearing element P4 and the fifth bearing element P5 along the optical axis direction satisfy: 2.05 < Lb / (EP34 + EP45) < 3.30. By restricting the ratio of the bearing element between the lenses to the total height of the lens barrel, the fourth lens E4 and the fifth lens E5 are evenly distributed along the second central axis. The periscope lens designed according to this conditional formula can reduce the height step difference during the assembly process, improve the assembly stability, and contribute to improving the product yield.

[0094] Optionally, in an embodiment provided by the present application, the combined focal length f45 of the fourth lens E4 and the fifth lens E5, the image-side inner diameter d5m of the fifth bearing element P5, and the image-side inner diameter d3m of the third bearing element P3 satisfy: 35.2 ≤ f45 / |d5m - d3m| ≤ 46.15. By restricting the ratio of the difference in the image-side inner diameters of the third bearing element P3 and the fifth bearing element P5 to the combined focal length of the fourth lens E4 and the fifth lens E5, not only can the surface curvatures of adjacent lenses be effectively controlled to make the lens surface profile smooth, but also the optical effective aperture is within a reasonable range, which is more conducive to the forming process of the lens; at the same time, the setting of the inner diameter of the bearing element can effectively control the light path between the fourth lens E4 and the fifth lens E5 and intercept non-imaging light, weakening the formation of stray light.

[0095] Optionally, in an embodiment provided by the present application, the object-side inner diameter d4s of the fourth bearing element P4, the object-side inner diameter d5s of the fifth bearing element P5, the refractive index N4 of the fourth lens E4, and the refractive index N5 of the fifth lens E5 satisfy: 3.10 mm < (d4s + d5s) / (N4 + N5) < 3.80 mm. By restricting the refractive indices of the fourth lens E4 and the fifth lens E5 and the inner diameters of the fourth and fifth bearing elements P5, under the conditions of meeting the lens focal length, surface curvature, forming thickness ratio, etc., the design of the inner diameter of the bearing element can effectively intercept the stray light path of the system, especially significantly improving the inner reflection light path of the flange structure of the fourth lens E4 and the fifth lens E5, reducing the risk of stray light.

[0096] Optionally, in an embodiment provided by the present application, the distance EP34 between the third bearing element P3 and the fourth bearing element P4 along the optical axis direction and the central thickness CT4 of the fourth lens E4 satisfy: 0.95 < EP34 / CT4 ≤ 1.20. By restricting the ratio of EP34 and CT4, the overall shape and thickness distribution of the fourth lens E4 can be ensured to be uniform, avoiding irregular refraction of light when passing through the lens, which is beneficial to reducing imaging distortion, making light of different wavelengths focus on the same plane, and thus reducing the design chromatic aberration.

[0097] Optionally, in an embodiment provided in the present application, the air gap T23 on the axis between the second lens E2 and the third lens E3, the air gap T34 on the axis between the third lens E3 and the fourth lens E4, the sum of the maximum thickness of all supporting elements ∑CP2 between the second lens E2 and the third lens E3, and the sum of the maximum thickness of all supporting elements ∑CP3 between the third lens E3 and the fourth lens E4 satisfy: 3.05<(T23+T34) / (∑CP2+∑CP3)≤16.75. Through this conditional constraint, the lenses in the second lens barrel P02 can be uniformly distributed along the optical axis, and the stability of the lenses in the second lens barrel P02 during the assembly process can be ensured. On the one hand, it is prevented that the gap between the lenses is too small to cause collisions due to the assembly punching force during the assembly process; on the other hand, it is prevented that the air flow inside the lens is accelerated when the gap between the lenses is too large, which makes the lens more likely to expand or contract when the external temperature changes, which is conducive to improving the reliability performance of the periscope lens and increasing the stability of the lens imaging.

[0098] The present application also provides a periscope lens, including two lens barrels, two lens groups, a reflector Rm and several supporting elements:

[0099] The first lens barrel P01 has a first central axis;

[0100] The second lens barrel P02 has a second central axis intersecting the first central axis;

[0101] A first lens group includes a first lens E1 mounted on the first lens barrel P01, wherein the first lens E1 has positive refractive power;

[0102] A second lens group includes a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6 which are arranged in sequence from the object side end surface to the image side end surface of the second lens barrel P02 and have a common optical axis, one of the second lens E2 and the third lens E3 has positive focal power and the other has negative focal power, an absolute value of the effective focal length of the third lens E3 is less than or equal to an absolute value of the effective focal length of any one of the second lens E2, the fourth lens E4, the fifth lens E5 and the sixth lens E6, the fourth lens E4 and / or the fifth lens E5 have positive focal power, and the sixth lens E6 has negative focal power;

[0103] a reflecting mirror Rm, located between the first lens E1 and the second lens E2 and used to reflect the light emitted through the image side end surface of the first lens barrel P01 toward the second lens E2; and

[0104] a supporting element group, comprising a second supporting element P2 disposed on the image side of the second lens E2 and abutting against the image side surface of the second lens E2, a third supporting element P3 disposed on the image side of the third lens E3 and abutting against the image side surface of the third lens E3, a fourth supporting element P4 disposed on the image side of the fourth lens E4 and abutting against the image side surface of the fourth lens E4, and a fifth supporting element P5 disposed on the image side of the fifth lens E5 and abutting against the image side surface of the fifth lens E5;

[0105] The effective focal length f3 of the third lens E3, the center thickness CT3 of the third lens E3, the distance EP34 between the third supporting element P3 and the fourth supporting element P4 along the optical axis, the distance EP45 between the fourth supporting element P4 and the fifth supporting element P5 along the optical axis, the object side outer diameter D4s of the fourth supporting element P4, and the image side outer diameter D3m of the third supporting element P3 satisfy the following conditions:

[0106] 4.2 <f3 / (CT3-EP34)<7.3;

[0107] 1.95<(EP34+EP45) / EP34<3.00; and

[0108] 1.00 <D4s / D3m<1.30。

[0109] In this way, through the constraints on the optical parameters of the third lens E3 and the distance between the adjacent supporting elements in the above conditional formula, the overall shape of the lens can be guaranteed to be evenly distributed along the vertical optical axis, and the lens thickness can be reasonably designed along the optical axis, which can effectively reduce the curvature of the lens surface, reduce the risk of failure in the molding of a single component, make the actual lens processing surface more stable, obtain a smaller surface PV value, and better surface eccentricity performance, reduce the sensitivity of the lens assembly, and improve the MTF performance of the lens. At the same time, the third lens E3 is located in the middle position of the second lens barrel P02. Through the constraints on the outer diameter ratio of the adjacent supporting elements in the condition, it can be guaranteed that the assembly step difference of each lens is within the reasonable range of the assembly process, improve the mechanical strength and assembly stability of the lens, and avoid the problem of assembly deformation or even lens and lens barrel breakage due to excessive assembly step difference during assembly.

[0110] Some specific and non-restrictive examples of the present application are described in more detail below with reference to the accompanying drawings.It is to be understood that any one of the following examples one to three is applicable to all embodiments of the present application.In the three embodiments provided in the present application, each embodiment comprises three working conditions, and the parameters (surface type, radius of curvature, center thickness, material, cone coefficient, etc.) of the lens used for imaging in the three working conditions are the same, and the distance between the lenses is the same, and the difference is that the parameters (thickness, object side inner diameter, image side inner diameter, etc.) of the structure (lens barrel, spacing element) used for auxiliary imaging are different.

[0111] For the convenience of description, in the following examples, OBJ represents the reflective surface of the object, STO represents the surface of the aperture, f represents the effective focal length of the periscope lens, fa represents the effective focal length of the lens at infinity, and fb represents the effective focal length of the lens at an object distance of 150 mm; fi represents the effective focal length of the i-th lens, i = 1, 2, 3, 4, 5, 6, Semi-FOVa represents half of the maximum field of view angle at infinity, and Semi-FOVa represents half of the maximum field of view angle at an object distance of 150 mm.

[0112] Also, please refer again to Figure 3 , along the optical path from the object side to the image side, the surface numbers of the functional surfaces of the light path are defined as S1 to SN in sequence, where S1 represents the surface number of the first functional surface along the light path in the direction of the optical path, and SN represents the surface number of the Nth functional surface along the light path in the reverse direction of the optical path. Specifically, S1 and S2 represent the object side surface and the image side surface of the first lens E1, respectively, S3 represents the reflecting surface of the reflector Rm, S4 and S5 represent the object side surface and the image side surface of the second lens E2, respectively, S6 and S7 represent the object side surface and the image side surface of the third lens E3, respectively, S8 and S9 represent the object side surface and the image side surface of the fourth lens E4, respectively, S10 and S11 represent the object side surface and the image side surface of the fifth lens E5, respectively, and S12 and S13 represent the object side surface and the image side surface of the sixth lens E6, respectively.

[0113] The optical path is explained as follows: the light emitted by the object passes through S1 and S2, is reflected by S3, and is emitted toward the second lens group, passes through S4 to S13 in sequence, and then reaches the photosensitive chip behind the lens.

[0114] The quadratic surfaces and aspherical surfaces involved in this patent still satisfy the following formula:

[0115]

[0116] In the above formula, x represents the distance vector height from the position at a height of h along the optical axis to the vertex of the aspheric surface, c represents the curvature, h represents the radial distance from the optical axis, k represents the cone coefficient, and Ai represents the i-th order constant.

[0117] In the subsequent embodiments, the surface shape of the lens generally refers to the concavity and convexity of the paraxial region of the lens, and the paraxial region is the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be based on the judgment method of the general knowledgeable person in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial region, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the concavity and convexity. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0118] In the drawings of the subsequent embodiments, Y and X respectively represent the extension directions of the first central axis and the second central axis of the periscope lens.

[0119] Specific Figure 5A Taking the optical module of working condition 1-1 in the first embodiment as an example, the surface data of each optical element of the optical module of the first embodiment represented by Table 1 are shown. The radius of curvature of the object side surface S4 of the second lens E2 is 4.4637, and the radius of curvature of the image side surface S5 is -30.4133, which means that the object side surface of the second lens E2 is convex and the image side surface is convex. The radius of curvature of the object side surface S6 of the third lens E3 is -316.0349, and the radius of curvature R of the image side surface S7 is 3.4131, which means that the object side surface of the third lens E3 is concave and the image side surface is also concave.

[0120] Embodiment 1

[0121] like FIG. 5A to FIG. 7B As shown, this embodiment involves three working conditions 1-1, 1-2, and 1-3. The present application also shows a schematic diagram of the structure of the periscope lens under each working condition when the object distance is infinite and when the object distance is 150 mm. In working conditions 1-1, 1-2, and 1-3, the parameters of the lens used for imaging (surface shape, radius of curvature, thickness, material, and conic coefficient) are the same, while the parameters of the lens barrel and multiple spacer elements used for auxiliary imaging (maximum thickness, inner diameter, lens edge thickness) are at least partially different, see Table 8 for details.

[0122] The optical power and surface shape of the lenses in the embodiment are as follows: the positive and negative properties of the optical power of the first lens E1 to the sixth lens E6 are: positive, positive, negative, positive, positive, negative, respectively; the object side surface of the first lens E1 is convex, and the image side surface is concave; the object side surface of the second lens E2 is convex, and the image side surface is convex; the object side surface of the third lens E3 is concave, and the image side surface is concave; the object side surface of the fourth lens E4 is convex, and the image side surface is concave; the object side surface of the fifth lens E5 is concave, and the image side surface is convex; and the object side surface of the sixth lens E6 is convex, and the image side surface is concave.

[0123] Figure 5A , 5B For the structure corresponding to working condition 1-1, the abutment between each supporting element in the supporting element group and each lens in the second lens group is as follows: the object side surface and image side surface of the second supporting element P2 are respectively abutted with the image side surface S5 of the second lens and the object side surface S6 of the third lens. The object side surface and image side surface of the third supporting element P3 are respectively abutted with the image side surface S7 of the third lens and the object side surface S8 of the fourth lens. The object side surface and image side surface of the fourth supporting element P4 are respectively abutted with the image side surface S9 of the fourth lens and the object side surface S10 of the fifth lens, and the object side surface and image side surface of the fifth supporting element P5 are respectively abutted with the image side surface S11 of the fifth lens and the object side surface S12 of the sixth lens. Fig. 6A , 6B Corresponding working conditions 1-2 and Fig. 7A , 7B The abutment method of the supporting element in the corresponding working condition 1-3 is the same as that in working condition 1-1, and will not be repeated here.

[0124] Table 1 gives the design data of the periscope lens in Example 1, and Table 2 gives the high-order coefficient parameters of the aspheric surface in Table 1.

[0125] Table 1

[0126] Face number Face type Radius of curvature thickness Material Cone coefficient OBJ Spherical endless Infinity|150 S1 Aspheric 14.4853 0.8000 1.814,41.0 -0.0487 S2 Aspheric 18.1380 0.0000 -0.0064 Spherical endless 4.0000 S3 (Reflection) Spherical endless 0.0000 Spherical endless 6.5477 Spherical endless 0|-1.2419 Spherical endless 1.0377 STO Spherical endless -1.0377 S4 Aspheric 4.4637 2.3697 1.537,55.61 0.0044 S5 Aspheric -30.4133 0.0400 0.4052 S6 Aspheric -316.0349 0.9960 1.645,23.53 99.0000 S7 Aspheric 3.5255 0.5629 -0.0006 S8 Aspheric 3.4131 1.2952 1.619,25.93 -0.0003 S9 Aspheric 5.7510 0.3356 0.0451 S10 Aspheric -13.9833 1.8621 1.678,19.25 -0.0762 S11 Aspheric -8.6517 0.2925 -0.0717 S12 Aspheric 3.8992 0.8492 1.537,55.61 -0.0121 S13 Aspheric 2.9115 3.6068 -1.0138 Spherical endless 0|1.2419 S14 Spherical endless 0.2100 1.518,64.2 S15 Spherical endless 0.3800 S16 Spherical endless

[0127] Table 2

[0128]

[0129]

[0130] Fig. 8A is an astigmatism curve diagram of the periscope lens in Example 1 when the object distance is infinite, Figure 8B : is a distortion curve diagram of the periscope lens in Example 1 when the object distance is infinite. FIG. 8A to FIG. 8B It can be seen that the periscope lens of Example 1 can achieve good imaging quality.

[0131] Embodiment 2

[0132] like FIG. 9A to FIG. 11B As shown, this embodiment involves three working conditions 1-1, 1-2, and 1-3. The present application also shows a schematic diagram of the structure of the periscope lens under each working condition when the object distance is infinite and when the object distance is 150 mm. In working conditions 2-1, 2-2, and 2-3, the parameters (surface shape, radius of curvature, thickness, material, and conic coefficient) of the lens used for imaging are the same, while the parameters of the lens barrel and multiple spacer elements used for auxiliary imaging are at least partially different, see Table 8 for details.

[0133] The optical power and surface shape of the lenses in the embodiment are as follows: the positive and negative properties of the optical power of the first lens E1 to the sixth lens E6 are: positive, positive, negative, positive, negative, negative, the object side surface of the first lens E1 is convex, and the image side surface is concave, the object side surface of the second lens E2 is convex, and the image side surface is convex, the object side surface of the third lens E3 is concave, and the image side surface is concave, the object side surface of the fourth lens E4 is convex, and the image side surface is convex, the object side surface of the fifth lens E5 is concave, and the image side surface is convex, and the object side surface of the sixth lens E6 is convex, and the image side surface is concave.

[0134] Fig. 9A , 9B For the structure corresponding to working condition 2-1, the abutment between each supporting element in the supporting element group and each lens in the second lens group is as follows: the object side surface and image side surface of the second supporting element P2 are respectively abutted with the image side surface S5 of the second lens and the object side surface S6 of the third lens. The object side surface and image side surface of the third supporting element P3 are respectively abutted with the image side surface S7 of the third lens and the object side surface S8 of the fourth lens. The object side surface and image side surface of the fourth supporting element P4 are respectively abutted with the image side surface S9 of the fourth lens and the object side surface S10 of the fifth lens, and the object side surface and image side surface of the fifth supporting element P5 are respectively abutted with the image side surface S11 of the fifth lens and the object side surface S12 of the sixth lens. Fig. 10A , 10B The corresponding working condition 2-2 and Fig.11A , 11B The abutment method of the supporting element in the corresponding working condition 2-3 is the same as that in working condition 2-1, and will not be repeated here.

[0135] Table 3 gives the design data of the periscope lens in Example 2, and Table 4 gives the high-order coefficient parameters of the aspheric surface in Table 1.

[0136] Table 3

[0137]

[0138]

[0139] Table 4

[0140] Face number A4 A6 A8 A10 A12 A14 A16 S4 3.75E-04 4.04E-04 -2.31E-04 8.43E-05 -1.93E-05 2.91E-06 -2.77E-07 S5 3.46E-02 -3.56E-02 1.97E-02 -6.60E-03 1.41E-03 -1.94E-04 1.67E-05 S6 3.84E-02 -3.95E-02 2.30E-02 -8.26E-03 1.91E-03 -2.87E-04 2.71E-05 S7 2.76E-02 -1.54E-02 9.04E-03 -3.79E-03 1.14E-03 -2.34E-04 3.07E-05 S8 1.91E-02 -2.57E-03 2.09E-03 -1.47E-03 6.46E-04 -1.64E-04 2.39E-05 S9 -2.04E-02 2.09E-02 -8.94E-03 1.87E-03 -4.95E-05 -5.66E-05 1.09E-05 S10 -5.28E-02 3.20E-02 -1.46E-02 4.31E-03 -8.28E-04 1.10E-04 -1.14E-05 S11 -3.16E-02 3.29E-02 -2.34E-02 1.07E-02 -3.23E-03 6.34E-04 -7.79E-05 S12 1.20E-02 3.82E-02 -3.28E-02 1.64E-02 -5.23E-03 1.07E-03 -1.34E-04 S13 3.69E-02 -6.40E-04 -1.59E-03 5.97E-04 -1.12E-04 1.21E-05 -7.41E-07 Face number A18 A20 S4 1.51E-08 -3.51E-10 S5 -8.18E-07 1.75E-08 S6 -1.46E-06 3.42E-08 S7 -2.29E-06 7.33E-08 S8 -1.87E-06 6.04E-08 S9 -7.77E-07 1.82E-08 S10 8.73E-07 -3.37E-08 S11 5.41E-06 -1.62E-07 S12 9.38E-06 -2.81E-07 S13 2.21E-08 -1.84E-10

[0141] Fig. 12A is an astigmatism curve diagram of the periscope lens in Example 2 when the object distance is infinite, Fig. 12B is a distortion curve diagram of the periscope lens in Example 2 when the object distance is infinite. FIG. 12A to FIG. 12B It can be seen that the periscope lens of the second embodiment can achieve good imaging quality.

[0142] Embodiment 3

[0143] like FIG. 13A to FIG. 15B As shown, this embodiment involves three working conditions 1-1, 1-2, and 1-3. The present application also shows a schematic diagram of the structure of the periscope lens under each working condition when the object distance is infinite and when the object distance is 150 mm. In working conditions 3-1, 3-2, and 3-3, the parameters (surface shape, radius of curvature, thickness, material, and conic coefficient) of the lens used for imaging are the same, while the parameters of the lens barrel and multiple spacer elements used for auxiliary imaging are at least partially different, see Table 8 for details.

[0144] The optical power and surface shape of the lenses in the embodiment are as follows: the positive and negative properties of the optical power of the first lens E1 to the sixth lens E6 are: positive, negative, positive, negative, positive, negative, the object side surface of the first lens E1 is convex, and the image side surface is concave, the object side surface of the second lens E2 is convex, and the image side surface is concave, the object side surface of the third lens E3 is convex, and the image side surface is concave, the object side surface of the fourth lens E4 is concave, and the image side surface is convex, the object side surface of the fifth lens E5 is convex, and the image side surface is concave, and the object side surface of the sixth lens E6 is concave, and the image side surface is convex.

[0145] Fig.13A , 13B For the structure corresponding to working condition 3-1, the supporting element group further includes a third auxiliary supporting element P3b and a third auxiliary supporting element P3c placed between the third supporting element P3 and the object side of the fourth lens E4, and a fourth auxiliary supporting element P4b and a fourth auxiliary supporting element P4c placed between the fourth supporting element P4 and the object side of the fifth lens E5. The abutment between each supporting element and each lens in the second lens group is as follows:

[0146] The object side surface and image side surface of the second supporting element P2 are respectively in partial contact with the image side surface S5 of the second lens and the object side surface S6 of the third lens. The object side surface of the third supporting element P3 is respectively in partial contact with the image side surface S7 of the third lens, the object side surface of the third auxiliary supporting element P3b is respectively in partial contact with the image side surface of the third supporting element P3, and the object side surface and image side surface of the third auxiliary supporting element P3c are respectively in partial contact with the image side surface S8 of the third auxiliary supporting element P3b and the object side surface S9 of the fourth lens. The object side surface of the fourth supporting element P4b is respectively in partial contact with the image side surface S9 of the fourth lens, the object side surface of the fourth auxiliary supporting element P4b is respectively in partial contact with the image side surface of the fourth supporting element P4, and the object side surface and image side surface of the fourth auxiliary supporting element P4c are respectively in partial contact with the fourth auxiliary supporting element P4b and the object side surface S10 of the fifth lens. The object side surface and image side surface of the fifth supporting element P5 are respectively in partial contact with the image side surface S11 of the fifth lens and the object side surface S12 of the sixth lens. Fig.14A , 14B The corresponding working conditions 3-2 and Fig.15A , 15B The abutment method of the supporting element in the corresponding working condition 3-3 is the same as that in working condition 3-1, and will not be repeated here.

[0147] Table 5 gives the design data of the periscope lens in Example 3, and Table 6 gives the high-order coefficient parameters of the aspheric surface in Table 1.

[0148] Table 5

[0149] Face number Face type Radius of curvature thickness Material Cone coefficient OBJ Spherical endless Infinity|150 S1 Aspheric 6.7513 0.7045 1.489,70.42 0.0000 S2 Aspheric 7.8655 0.0000 -1.8415 Spherical endless 4.0000 S3 (Reflection) Spherical endless 0.0000 Spherical endless 4.6487 Spherical endless 1.3589|0.1288 STO Spherical endless -0.5368 S4 Aspheric 4.8903 0.5994 1.679,19.24 0.0000 S5 Aspheric 3.5187 0.1961 0.0000 S6 Aspheric 3.9617 1.7000 1.546,56.14 0.0000 S7 Aspheric 22.3008 0.9257 0.0000 S8 Aspheric -4.5467 1.3509 1.679,19.4 0.0000 S9 Aspheric -5.8090 0.0400 0.0000 S10 Aspheric 2.7003 0.9319 1.537,55.61 -1.0000 S11 Aspheric 3.6188 2.2821 0.0000 S12 Aspheric -2.1333 0.4108 1.537,55.61 -1.0000 S13 Aspheric -3.0618 0.2589|1.489 -1.0000 S14 Spherical endless 0.2100 1.518,64.2 S15 Spherical endless 3.8742 S16 Spherical endless

[0150] Table 6

[0151]

[0152]

[0153] Fig.16A is an astigmatism curve diagram of the periscope lens in Example 3 when the object distance is infinite, Fig. 16B : is a distortion curve diagram of the periscope lens in Example 3 when the object distance is infinite. FIG. 16A to FIG. 16B It can be seen that the periscope lens of Example 3 can achieve good imaging quality.

[0154] The optical parameters of Examples 1 to 3 are shown in Table 7:

[0155] Table 7

[0156] Optical parameters Embodiment 1 Embodiment 2 Embodiment 3 Semi-FOVa(°) 10.296 16.040 9.344 Semi-FOVb(°) 9.1157 14.853 8.3839 fa(mm) 13.302 13.320 13.276 fb(mm) 13.113 13.129 13.086 f1(mm) 80.50 80.32 80.68 f2(mm) 7.43 7.47 -22.45 f3(mm) -5.40 -5.08 8.54 f4(mm) 11.19 8.41 -54.33 f5(mm) 29.35 -1722.24 14.62 f6(mm) -30.60 -100.91 -15.49

[0157] The black object data corresponding to the structures of Examples 1 to 3 are shown in Table 8. Unit (mm):

[0158] Table 8

[0159]

[0160]

[0161] The relationship satisfied by the data of Examples 1 to 3 is shown in Table 9:

[0162] Table 9

[0163] Conditional_Data 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 R1 / R2*N1 1.45 1.45 1.45 1.50 1.50 1.50 1.28 1.28 1.28 (D3m-d3s) / (D2m-d2s) 1.44 1.88 1.43 1.49 1.85 1.78 1.08 2.68 1.08 B1+B2 1.10 1.45 1.16 1.02 1.11 1.10 1.02 1.03 1.05 (EP02+EP23) / (CT2+CT3) 1.11 1.14 1.19 1.12 1.10 1.11 0.93 0.93 0.93 d2s / (D4s-d2m) 2.95 2.96 2.88 3.08 3.10 3.06 3.49 3.41 3.38 fa / (X2+Y1) 0.78 0.78 0.78 0.78 0.78 0.78 0.99 0.99 0.99 (D5m-d5s) / (D4m-d4s) 0.97 0.96 0.97 0.94 0.94 0.94 1.60 0.75 0.73 Lb / (EP34+EP45) 2.89 2.91 3.00 3.26 3.18 3.18 2.07 2.07 2.06 EP23 / CT3+T23 / CP2 3.96 4.37 4.15 4.10 4.50 4.50 9.21 11.20 11.20 f45 / |d5m-d3m| 41.43 35.35 36.00 46.15 37.51 37.51 35.35 35.20 35.20 (d4s+d5s) / (N4+N5) 3.21 3.21 3.22 3.15 3.17 3.17 3.77 3.78 3.79 EP34 / CT4 1.17 1.20 1.15 0.98 1.03 1.02 1.18 1.18 1.18 (T23+T34) / (∑CP2+∑CP3) 13.70 16.75 15.07 12.63 15.44 15.44 3.07 3.19 3.28 f3 / (CT3-EP23) 4.73 4.71 4.72 4.22 4.24 4.24 7.10 7.28 7.22 (EP23+EP45) / EP34 2.41 2.35 2.46 2.99 2.85 2.88 1.97 1.98 1.98 D4s / D3m 1.01 1.26 1.01 1.01 1.25 1.26 1.03 1.03 1.03

[0164] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0165] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A periscope lens, characterized in that: Comprising: A first lens barrel having a first central axis; A second lens barrel having a second central axis intersecting the first central axis; A first lens group including a first lens mounted on the first lens barrel, the first lens having a positive optical power, and the object side surface and the image side surface of the first lens being convex and concave respectively; A second lens group mounted on the second lens barrel, the second lens group including a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side end face to the image side end face of the second lens barrel and sharing the same optical axis, the object side surface of the second lens being convex, the image side surface of the third lens being concave, one of the second lens and the third lens having a positive optical power and the other having a negative optical power, the fourth lens and / or the fifth lens having a positive optical power, and the sixth lens having a negative optical power; A reflecting mirror disposed between the first lens and the second lens and inclined with respect to the first central axis and the second central axis for reflecting the light rays emitted from the image side end face of the first lens barrel to the second lens; And A bearing element group including a second bearing element disposed on the image side of the second lens and abutting against the image side surface of the second lens, and a third bearing element disposed on the image side of the third lens and abutting against the image side surface of the third lens; The following relationships are satisfied among the object side curvature radius R1 of the first lens, the image side curvature radius R2 of the first lens, the refractive index N1 of the first lens, the image side outer diameter D3m of the third bearing element, the object side inner diameter d3s of the third bearing element, the image side outer diameter D2m of the second bearing element, and the object side inner diameter d2s of the second bearing element: 1.25 < R1 / R2 * N1 ≤ 1.5; and 1.05 < (D3m - d3s) / (D2m - d2s) < 2.

70.

2. The periscope lens according to claim 1, characterized in that: The second lens barrel is slidably disposed on the image side of the reflecting mirror along the second central axis, and the object distance range of the periscope lens is from infinity to 150 mm.

3. The periscope lens according to claim 2, characterized in that: The following relationships are satisfied among the effective focal length fa of the periscope lens in the infinity state, the axial distance Y1 from the intersection point of the object side surface of the first lens and the optical axis to the reflecting surface of the reflecting mirror, the axial distance X2 from the object side surface of the second lens to the image side surface of the sixth lens, and the maximum length X of the periscope lens along the second central axis: 0.65 < fa / (X2 + Y1) < 0.73, 19.45 mm < X < 21.40 mm.

4. The periscope lens according to claim 1, characterized in that: The following relationship is satisfied between the maximum thickness B1 of the first lens barrel and the maximum thickness B2 of the object side end face of the second lens barrel: 1.00 mm < B1 + B2 ≤ 1.45 mm.

5. The periscope lens according to claim 1, characterized in that: The following relationship is satisfied among the axial distance EP02 from the object side end face of the second lens barrel to the object side surface of the second bearing element, the axial interval distance EP23 between the second bearing element and the third bearing element, the central thickness CT2 of the second lens, and the central thickness CT3 of the third lens: 0.90 < (EP02 + EP23) / (CT2 + CT3) < 1.

20.

6. The periscope lens according to claim 1, characterized in that: The interval distance EP23 between the second supporting element and the third supporting element along the optical axis, the center thickness CT3 of the third lens, the axial air gap T23 between the second lens and the third lens, and the maximum thickness CP2 of the second supporting element satisfy: 3.95 <EP23 / CT3+T23 / CP2≤11.20。 7. The periscope lens according to any one of claims 1 to 6, characterized in that: The supporting element group further includes a fourth supporting element disposed on the image side of the fourth lens and abutting against the image side surface of the fourth lens; The object side inner diameter d2s of the second supporting element, the object side outer diameter D4s of the fourth supporting element, and the image side inner diameter d2m of the second supporting element satisfy: 2.85 <d2s / (D4s-d2m)<3.50。 8. The periscope lens according to claim 7, characterized in that: The supporting element group further includes a fifth supporting element disposed on the image side of the fifth lens and abutting against the image side surface of the fifth lens; The image side outer diameter D5m of the fifth supporting element, the object side inner diameter d5s of the fifth supporting element, the image side outer diameter D4m of the fourth supporting element, and the object side inner diameter d4s of the fourth supporting element satisfy: 0.70<(D5m-d5s) / (D4m-d4s)<1.

65.

9. The periscope lens according to claim 8, characterized in that: The maximum height Lb of the second lens barrel along the second central axis, the spacing EP34 between the third supporting element and the fourth supporting element along the optical axis, and the spacing EP45 between the fourth supporting element and the fifth supporting element along the optical axis satisfy: 2.05 <Lb / (EP34+EP45)<3.30。 10. The periscope lens according to claim 8, characterized in that: The combined focal length f45 of the fourth lens and the fifth lens, the image side inner diameter d5m of the fifth supporting element, and the image side inner diameter d3m of the third supporting element satisfy: 35.2≤f45 / |d5m-d3m|≤46.

15.

11. The periscope lens according to claim 8, characterized in that: The object side inner diameter d4s of the fourth supporting element, the object side inner diameter d5s of the fifth supporting element, the refractive index N4 of the fourth lens, and the refractive index N5 of the fifth lens satisfy: 3.10mm<(d4s+d5s) / (N4+N5)<3.80mm.

12. The periscope lens according to claim 7, characterized in that: The spacing distance EP34 between the third supporting element and the fourth supporting element along the optical axis direction and the center thickness CT4 of the fourth lens satisfy: 0.95 <EP34 / CT4≤1.20。 13. The periscope lens according to claim 7, characterized in that: The on-axis air gap T23 between the second lens and the third lens, the on-axis air gap T34 between the third lens and the fourth lens, the sum of the maximum thicknesses ∑CP2 of all supporting elements between the second lens and the third lens, and the sum of the maximum thicknesses ∑CP3 of all supporting elements between the third lens and the fourth lens satisfy the following: 3.05<(T23+T34) / (∑CP2+∑CP3)≤16.75.

Images