Optical system and periscopic camera module

Abstract

An optical system (100) and a periscopic camera module. The optical system (100) uses a specific optical design, such that a large aperture of the periscopic camera module can be achieved, the shoulder height of a lens group of the periscopic camera module is reduced, and the optical image stabilization performance of the periscopic camera module is ensured. The optical system (100) sequentially comprises, from an object side to an image side, a first lens (E1), a prism (E2), a second lens (E3), and a lens group (E20), wherein the first lens (E1) has a positive focal power, and is used for converging light; the prism (E2) is used for deflecting the light; the second lens (E3) has a negative focal power, and is used for expanding the light; and the lens group (E20) comprises a plurality of lenses, which are arranged in sequence. The lens group (E20) and the optical system (100) satisfy the following condition: 0.38<GH / EPD<1.00, where GH represents the shoulder height of the lens group (E20), EPD represents the entrance pupil diameter of the optical system (100), and GH / EPD represents the ratio of the shoulder height of the lens group (E20) to the entrance pupil diameter of the optical system (100).

Description

Optical system and periscopic camera module TECHNICAL FIELD

[0001] The present application relates to the field of camera, and more particularly, to an optical system and a periscopic camera module. BACKGROUND

[0002] With the development of technology, mobile phones have developed into multifunctional electronic devices integrating camera, video and entertainment. Due to the increasing diversification of people's shooting needs, the camera function of mobile phones has gradually become the focus of mobile phone users. At the same time, in order to maintain the overall aesthetics of mobile phones, it has become an inevitable trend for mobile phones to become thinner and thinner. How to reduce the height of the mobile phone module while ensuring the shooting quality is a major difficulty in the development of mobile phone camera modules at present.

[0003] With the continuous maturity and development of mobile phone camera module technology, mobile phone camera modules can achieve high-quality shooting in multiple scenarios such as close-range, wide-angle, long-range and night scenes. At present, the most common long-range shooting camera module is a periscopic camera module. The conventional periscopic camera module is a camera module that realizes long-range shooting by combining a long-focus lens without increasing the thickness of the mobile phone through prism deflection of the optical path, and has the characteristics of large focal length, small field of view, short depth of field, and long shooting distance. SUMMARY

[0004] The main advantage of the present application is to provide an optical system and a periscopic camera module, wherein the optical system adopts a specific optical design, which can realize a large aperture, reduce the shoulder height of the lens group, and ensure the optical anti-shake performance of the periscopic camera module.

[0005] Another advantage of the present application is to provide an optical system and a periscopic camera module, wherein the optical system mainly formulates an optical design scheme from the aspects of optical path design and optical parameter control, which can ensure its final performance in multiple directions.

[0006] According to an aspect of the present application, an optical system is provided, which comprises:

[0007] a first lens having positive refractive power for converging light rays;

[0008] a prism for deflecting the light rays;

[0009] a second lens having negative refractive power for diverging the light rays; and

[0010] a lens group comprising a plurality of lenses arranged in sequence;

[0011] wherein the lens group and the optical system satisfy the following conditions:

[0012] 0.38 < GH / EPD < 0.45;

[0013] wherein GH represents a shoulder height of the lens group; EPD represents an entrance pupil diameter of the optical system; GH / EPD represents a ratio of the shoulder height of the lens group to the entrance pupil diameter of the optical system.

[0014] In an embodiment of the optical system according to the present application, the first lens satisfies the following condition: 3.0 < D1 / CT1 < 5.2; wherein D1 represents an effective diameter of the first lens; CT1 represents a center thickness of the first lens; D1 / CT1 represents a ratio of the effective diameter of the first lens to the center thickness of the first lens.

[0015] In an embodiment of the optical system according to the present application, the second lens satisfies the following condition: 2.2 < D2 / CT2 < 4.0; wherein D2 represents an effective diameter of the second lens; CT2 represents a center thickness of the second lens; D2 / CT2 represents a ratio of the effective diameter of the second lens to the center thickness of the second lens.

[0016] In an embodiment of the optical system according to the present application, the first lens satisfies the following condition: 3.2 > f1 / EFL > 2.0; wherein f1 represents an effective focal length of the first lens, EFL represents an effective focal length of the optical system; f1 / EFL represents a ratio of the effective focal length of the first lens to the effective focal length of the optical system.

[0017] In an embodiment of the optical system according to the present application, the first lens, the prism and the second lens form a folding optical unit, the folding optical unit satisfies the following condition: -13.5 < f12 / EFL < -5.0; wherein f12 represents an effective focal length of the folding optical unit; EFL represents an effective focal length of the optical system; f12 / EFL represents a ratio of the effective focal length of the folding optical unit to the effective focal length of the optical system.

[0018] In an embodiment of the optical system according to the present application, the optical system satisfies the following condition: tanFOV < 0.55; wherein FOV represents a field of view angle of the optical system; tanFOV represents a tangent value of the field of view angle of the optical system.

[0019] In an embodiment of the optical system according to the present application, the optical system further comprises a photosensitive chip, the first lens, the prism, the second lens, and the lens group are on a photosensitive path of the photosensitive chip, and the optical system satisfies the following condition: 1.1 < SL / EFL < 1.7; wherein, SL represents a total length of the optical system in an extension direction of a main optical axis thereof; EFL represents an effective focal length of the optical system; and SL / EFL represents a ratio of the total length of the optical system in the extension direction of the main optical axis thereof to the effective focal length of the optical system.

[0020] In an embodiment of the optical system according to the present application, the optical system further comprises a photosensitive chip, the first lens, the prism, the second lens, and the lens group are on a photosensitive path of the photosensitive chip, and the optical system satisfies the following condition: 3.2 < SL / EPD < 5.4; wherein, SL represents a total length of the optical system in an extension direction of a main optical axis thereof; EPD represents an entrance pupil diameter of the optical system; and SL / EPD represents a ratio of the total length of the optical system in the extension direction of the main optical axis thereof to the entrance pupil diameter of the optical system.

[0021] In an embodiment of the optical system according to the present application, the first lens and the second lens satisfy the following condition: 1.2 < |f1 / f2| < 1.7; wherein, f1 represents an effective focal length of the first lens; f2 represents an effective focal length of the second lens; f1 / f2 represents a ratio of the effective focal length of the first lens to the effective focal length of the second lens; and |f1 / f2| represents an absolute value of the ratio of the effective focal length of the first lens to the effective focal length of the second lens.

[0022] In an embodiment of the optical system according to the present application, the optical system further comprises a photosensitive chip, the first lens, the prism, the second lens, and the lens group are on a photosensitive path of the photosensitive chip, and the optical system satisfies the following object distance requirement: 12 cm ≤ OBJ < INF; wherein, OBJ represents an object distance that the optical system can achieve imaging; and INF represents infinity.

[0023] In an embodiment of the optical system according to the present application, the first lens has a first object side surface and a first image side surface, and the first object side surface has a convex surface shape.

[0024] In an embodiment of the optical system according to the present application, the second lens has a second object side and a second image side, the second object side has a concave surface shape.

[0025] According to another aspect of the present application, there is provided an optical system comprising:

[0026] a first lens having a positive power for converging a light ray;

[0027] a prism for turning the light ray;

[0028] a second lens having a negative power for diverging the light ray;

[0029] a lens group comprising a plurality of lenses arranged in sequence; and

[0030] wherein the lens group and the optical system satisfy the following condition:

[0031] 0.38 < GH / EPD < 1.00;

[0032] wherein GH represents a shoulder height of the lens group; EPD represents an entrance pupil diameter of the optical system; GH / EPD represents a ratio of the shoulder height of the lens group to the entrance pupil diameter of the optical system.

[0033] In an embodiment of the optical system according to the present application, the first lens satisfies the following condition: 3.0 < D1 / CT1 < 12.5; wherein D1 represents an effective diameter of the first lens; CT1 represents a center thickness of the first lens; D1 / CT1 represents a ratio of the effective diameter of the first lens to the center thickness of the first lens.

[0034] In an embodiment of the optical system according to the present application, the second lens satisfies the following condition: 2.2 < D2 / CT2 < 14.0; wherein D2 represents an effective diameter of the second lens; CT2 represents a center thickness of the second lens; D2 / CT2 represents a ratio of the effective diameter of the second lens to the center thickness of the second lens.

[0035] In an embodiment of the optical system according to the present application, the first lens satisfies the following condition: 3.2 > f1 / EFL > 1.5; wherein f1 represents an effective focal length of the first lens, EFL represents an effective focal length of the optical system; f1 / EFL represents a ratio of the effective focal length of the first lens to the effective focal length of the optical system.

[0036] In an embodiment of the optical system according to the present application, the first lens, the prism and the second lens form a folding optical unit, the folding optical unit satisfying the following condition: -13.5 < f12 / EFL < 6.8; wherein f12 represents an effective focal length of the folding optical unit; EFL represents an effective focal length of the optical system; f12 / EFL represents a ratio of the effective focal length of the folding optical unit to the effective focal length of the optical system.

[0037] In an embodiment of the optical system according to the present application, the optical system satisfies the following condition: tanFOV < 0.65; wherein FOV represents a field of view angle of the optical system; tanFOV represents a tangent value of the field of view angle of the optical system.

[0038] In an embodiment of the optical system according to the present application, the optical system further comprises a photosensitive chip, the first lens, the prism, the second lens and the lens group are on a photosensitive path of the photosensitive chip, the optical system satisfies the following condition: SL / EFL < 1.7; wherein SL represents a total length of the optical system in an extension direction of a main optical axis thereof; EFL represents an effective focal length of the optical system; SL / EFL represents a ratio of the total length of the optical system in the extension direction of the main optical axis thereof to the effective focal length of the optical system.

[0039] In an embodiment of the optical system according to the present application, the optical system further comprises a photosensitive chip, the first lens, the prism, the second lens and the lens group are on a photosensitive path of the photosensitive chip, the optical system satisfies the following condition: 3.1 < SL / EPD < 5.4; wherein SL represents a total length of the optical system in an extension direction of a main optical axis thereof; EPD represents an entrance pupil diameter of the optical system; SL / EPD represents a ratio of the total length of the optical system in the extension direction of the main optical axis thereof to the entrance pupil diameter of the optical system.

[0040] In an embodiment of the optical system according to the present application, the first lens and the second lens satisfy the following condition: 0.6 < |f1 / f2| < 1.7; wherein f1 represents an effective focal length of the first lens; f2 represents an effective focal length of the second lens; f1 / f2 represents a ratio of the effective focal length of the first lens to the effective focal length of the second lens; |f1 / f2| represents an absolute value of the ratio of the effective focal length of the first lens to the effective focal length of the second lens.

[0041] In an embodiment of the optical system according to the present application, the optical system further comprises a photosensitive chip, the first lens, the prism, the second lens and the lens group are on a photosensitive path of the photosensitive chip, and the optical system satisfies the following object distance requirement: 12cm < OBJ < INF; wherein, OBJ represents an object distance that the optical system can achieve imaging; and INF represents infinity.

[0042] According to yet another aspect of the present application, there is also provided a periscope camera module comprising:

[0043] a housing; and

[0044] an optical system as described above, mounted in the housing.

[0045] The above and other objects, features and advantages of the present application will become more apparent from the following description when taken in conjunction with the accompanying drawings, in which:

[0046] These and other objects, features and advantages of the present application will become apparent from the following detailed description of the application, when considered in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0047] The above and other objects, features and advantages of the present application will become more apparent from the following description when taken in conjunction with the accompanying drawings, in which:

[0048] The above and other objects, features and advantages of the present application will become more apparent from the following description when taken in conjunction with the accompanying drawings, in which:

[0049] FIG. 1 illustrates a structural schematic diagram of an optical system according to Embodiment 1 of the present application.

[0050] FIG. 2 illustrates a partially exploded schematic diagram of the optical system according to Embodiment 1 of the present application.

[0051] FIG. 3 illustrates a distortion curve schematic diagram of the optical system according to Embodiment 1 of the present application.

[0052] FIG. 4 illustrates a chromatic aberration curve schematic diagram of the optical system according to Embodiment 1 of the present application.

[0053] FIG. 5 illustrates a distortion curve diagram of the optical system according to Embodiment 1 of the present application.

[0054] FIG. 6 illustrates a structure diagram of the optical system according to Embodiment 2 of the present application.

[0055] FIG. 7 illustrates a partial exploded diagram of the optical system according to Embodiment 2 of the present application.

[0056] FIG. 8 illustrates a distortion curve diagram of the optical system according to Embodiment 2 of the present application.

[0057] FIG. 9 illustrates a chromatic aberration curve diagram of the optical system according to Embodiment 2 of the present application.

[0058] FIG. 10 illustrates a distortion curve diagram of the optical system according to Embodiment 2 of the present application.

[0059] FIG. 11 illustrates a structure diagram of the optical system according to Embodiment 3 of the present application.

[0060] FIG. 12 illustrates a partial exploded diagram of the optical system according to Embodiment 3 of the present application.

[0061] FIG. 13 illustrates a distortion curve diagram of the optical system according to Embodiment 3 of the present application.

[0062] FIG. 14 illustrates a chromatic aberration curve diagram of the optical system according to Embodiment 3 of the present application.

[0063] FIG. 15 illustrates a distortion curve diagram of the optical system according to Embodiment 3 of the present application.

[0064] FIG. 16 illustrates a structure diagram of the optical system according to Embodiment 4 of the present application.

[0065] FIG. 17 illustrates a partial exploded diagram of the optical system according to Embodiment 4 of the present application.

[0066] FIG. 18 illustrates a distortion curve diagram of the optical system according to Embodiment 4 of the present application.

[0067] FIG. 19 illustrates a chromatic aberration curve diagram of the optical system according to Embodiment 4 of the present application.

[0068] FIG. 20 illustrates a distortion curve diagram of the optical system according to Embodiment 4 of the present application.

[0069] FIG. 21 illustrates a structure diagram of the optical system according to Embodiment 5 of the present application.

[0070] FIG. 22 illustrates a partial exploded diagram of the optical system according to Embodiment 5 of the present application.

[0071] FIG. 23 illustrates a distortion curve diagram of the optical system according to Embodiment 5 of the present application.

[0072] FIG. 24 illustrates a chromatic aberration curve diagram of the optical system according to Embodiment 5 of the present application.

[0073] FIG. 25 illustrates a curvature of field curve diagram of the optical system according to Embodiment 5 of the present application.

[0074] FIG. 26 illustrates a structure diagram of the optical system according to Embodiment 6 of the present application.

[0075] FIG. 27 illustrates a partially exploded diagram of the optical system according to Embodiment 6 of the present application.

[0076] FIG. 28 illustrates a distortion curve diagram of the optical system according to Embodiment 6 of the present application.

[0077] FIG. 29 illustrates a chromatic aberration curve diagram of the optical system according to Embodiment 6 of the present application.

[0078] FIG. 30 illustrates a curvature of field curve diagram of the optical system according to Embodiment 6 of the present application.

[0079] FIG. 31 illustrates a structure diagram of the optical system according to Embodiment 7 of the present application.

[0080] FIG. 32 illustrates a partially exploded diagram of the optical system according to Embodiment 7 of the present application.

[0081] FIG. 33 illustrates a distortion curve diagram of the optical system according to Embodiment 7 of the present application.

[0082] FIG. 34 illustrates a chromatic aberration curve diagram of the optical system according to Embodiment 7 of the present application.

[0083] FIG. 35 illustrates a curvature of field curve diagram of the optical system according to Embodiment 7 of the present application.

[0084] FIG. 36 illustrates a structure diagram of the optical system according to Embodiment 8 of the present application.

[0085] FIG. 37 illustrates a partially exploded diagram of the optical system according to Embodiment 8 of the present application.

[0086] FIG. 38 illustrates a distortion curve diagram of the optical system according to Embodiment 8 of the present application.

[0087] FIG. 39 illustrates a chromatic aberration curve diagram of the optical system according to Embodiment 8 of the present application.

[0088] FIG. 40 illustrates a curvature of field curve diagram of the optical system according to Embodiment 8 of the present application.

[0089] FIG. 41 shows a structural schematic diagram of an optical system according to Embodiment 9 of the present application.

[0090] FIG. 42 shows a partially exploded schematic diagram of an optical system according to Embodiment 9 of the present application.

[0091] FIG. 43 shows a distortion curve schematic diagram of an optical system according to Embodiment 9 of the present application.

[0092] FIG. 44 shows a chromatic aberration curve schematic diagram of an optical system according to Embodiment 9 of the present application.

[0093] FIG. 45 shows a vignetting curve schematic diagram of an optical system according to Embodiment 9 of the present application.

[0094] FIG. 46 shows a structural schematic diagram of an optical system according to Embodiment 10 of the present application.

[0095] FIG. 47 shows a partially exploded schematic diagram of an optical system according to Embodiment 10 of the present application.

[0096] FIG. 48 shows a distortion curve schematic diagram of an optical system according to Embodiment 10 of the present application.

[0097] FIG. 49 shows a chromatic aberration curve schematic diagram of an optical system according to Embodiment 10 of the present application.

[0098] FIG. 50 shows a vignetting curve schematic diagram of an optical system according to Embodiment 10 of the present application.

[0099] In the drawings: 100, optical system; E10, turning optical unit; E1, first lens; E11, first object side; E12, first image side; E2, prism; E21, first side; E22, reflecting surface; E23, second side; E3, second lens; E31, second object side; E32, second image side; E20, lens group; E4, third lens; E41, third object side; E42, third image side; E5, fourth lens; E51, fourth object side; E52, fourth image side; E6, fifth lens; E61, fifth object side; E62, fifth image side; E7, sixth lens; E71, sixth object side; E72, sixth image side; E8, seventh lens; E81, seventh object side; E82, seventh image side; E9, eighth lens; E91, eighth object side; E92, eighth image side; E50, diaphragm; E30, filter; E301, filter object side; E302, filter image side; E40, photosensitive chip; E401, photosensitive surface; principal optical axis L1; DL1, first direction; DL2, second direction; DL3, third direction. DETAILED DESCRIPTION

[0100] Hereinafter, example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part but not all of the embodiments of the present application, and the present application can be implemented in many different forms. It should be understood that the present application is not limited to the described embodiments.

[0101] SUMMARY

[0102] The periscopic camera module mainly realizes long focal length shooting through the scheme of bending the light path. The periscopic camera module increases the focal length of the module through the bending of the light path, and the height dimension is similar to that of a straight-line module, so it can meet the size requirements of the terminal device.

[0103] Specifically, the periscopic camera module is provided with a prism on the object side of the lens assembly, wherein the prism reflects the light incident on the object side of the periscopic camera module to change the direction of the light, so that the bent light reaches the photosensitive chip after passing through the lens assembly and the color filter, and thus the periscopic camera module can be installed in the electronic device in a horizontal manner to ensure that the periscopic camera module can meet the long focal length shooting effect while reducing the height of the periscopic camera module.

[0104] Therefore, the periscopic camera module can change the angle of the incident light, reasonably change the long lens structure, and reduce the module height, thereby greatly realizing the requirements of miniaturization and optical zoom of the terminal device. Here, the periscopic camera module is installed in the electronic device (for example, a mobile phone) in a horizontal manner, that is, the optical axis of the lens assembly and the photosensitive chip of the periscopic camera module deviates from the thickness direction of the electronic device, for example, at an angle of 90 degrees.

[0105] The current periscopic camera module still cannot well meet the requirements of the market. It should be understood that in the optical system of the periscopic camera module, the aperture directly affects the night scene, snapshot, background blur, video, and other functions of the periscopic camera module, and using a large aperture (smaller aperture F value) lens for shooting can increase the blurred background of the photo and highlight the main body, and can also improve the shutter speed and focusing speed, and obtain better imaging quality.

[0106] However, the demand for a large aperture of the periscopic camera module contradicts the development trend of miniaturization and thinness of the terminal device. Among them, due to the size limitation of the light receiving surface of the prism, the area of the light receiving surface of the prism is limited, which in turn leads to less light entering the lens and a small effective aperture, thereby causing poor dark light effect and poor blur effect.

[0107] From the perspective of optical design, the present application mainly realizes a large aperture of the periscopic camera module, reduces the shoulder height of the lens group in the periscopic camera module, and guarantees the optical anti-shake performance of the periscopic camera module from the aspects of optical path design and parameter control.

[0108] Based on this, the application provides an optical system, which comprises, in order from the object side to the image side: a first lens, a prism, a second lens, and a lens group; the first lens has positive refractive power and is used for converging light; the prism is used for deflecting light; the second lens has negative refractive power and is used for diverging light; the lens group comprises a plurality of lenses arranged in order; wherein the lens group and the optical system satisfy the following condition: 0.38 < GH / EPD < 0.45; wherein GH represents the shoulder height of the lens group; EPD represents the entrance pupil diameter of the optical system; GH / EPD represents the ratio of the shoulder height of the lens group to the entrance pupil diameter of the optical system.

[0109] After introducing the basic principles of the application, various non-limiting embodiments of the application will be specifically introduced below with reference to the accompanying drawings.

[0110] Glossary

[0111] For the convenience of understanding, the technical terms involved in the application will be explained and described below.

[0112] 1. Optical axis: the direction in which the optical system conducts light, referring to the light of the central field of view. For a symmetric transmission system, it generally coincides with the center line of rotation of the optical system. For off-axis and reflection systems, the optical axis will appear as a broken line.

[0113] 2. Object side and image side: the side where the object is located is the object side, and the surface of the lens close to the object side can be called the object side surface; the side where the image of the object is located is the image side, and the surface of the lens close to the image side can be called the image side surface.

[0114] 3. Focal length: also known as focal length, it is a way to measure the convergence or divergence of light in an optical system, which refers to the distance from the optical center of the lens or lens group to the focal point when an infinite distant object passes through the lens or lens group to form a clear image on the focal plane, or it can be understood as the vertical distance from the optical center of the lens or lens group to the focal plane. From a practical point of view, it can be understood as the distance from the lens center to the imaging plane.

[0115] 4. Aperture: a device used to control the amount of light that passes through the lens into the body and reaches the light-sensitive surface, which is usually inside the lens. In the present application, Fno is used to represent the aperture of the optical system.

[0116] 5. F-number: equal to the focal length of the lens divided by the diameter of the entrance pupil. In the case of a constant focal length of the lens, the larger the diameter of the entrance pupil, the larger the aperture, the smaller the F-number, the more light enters, the brighter the picture, and the greater the subject background blurring; on the contrary, the smaller the diameter of the entrance pupil, the smaller the aperture, the larger the F-number, the less light enters, the darker the picture, and the clearer the subject before and after.

[0117] 6. MTF (Modulation Transfer Function): an important index for describing the imaging quality of an optical system.

[0118] 7. Sensitivity: the difference between the MTF design value at a unit angle of oscillation and the MTF design value at rest;

[0119] 8. Entrance pupil: the image formed by the aperture stop in front of the optical system. The entrance pupil and the exit pupil correspond to each other. The conjugate image of the aperture stop in the object space is called the "entrance pupil". The position and diameter of the entrance pupil represent the position and aperture of the incident light beam.

[0120] 9. FOV: field of view of the optical system.

[0121] 10. SL: total length of the optical system in the extension direction of the main optical axis set by the optical system; in the present application, the total length of the optical system in the extension direction of the main optical axis set by the optical system is equal to the distance between the first lens and the photosensitive surface in the optical system in the extension direction of the main optical axis set by the optical system.

[0122] 11. GH: shoulder height of the lens group; in the present application, the shoulder height of the lens group is determined by the maximum aperture of the lens group in the height direction set by the optical system. Accordingly, in the present application, the shoulder height is the maximum effective diameter of the lens group E20 in the height direction. In the optical system, the maximum effective diameter of the lens group E20 in the height direction is the diameter of the part that can receive light. If the lens group E20 is provided with a stop E50, the light needs to pass through the aperture of the stop E50 before reaching the lens group E20. Accordingly, in the optical system provided with the stop E50, the value of the maximum effective diameter of the lens group E20 in the height direction is equal to the aperture size of the stop E50.

[0123] 12. D1: effective diameter of the first lens.

[0124] 13. CT1: center thickness of the first lens. The center thickness of the first lens is equal to the distance between its object side (i.e., the first object side) and its image side (i.e., the first image side) in the extension direction of its optical axis.

[0125] 14. D2: effective diameter of the second lens.

[0126] 15. CT2: center thickness of the second lens. The center thickness of the second lens is equal to the distance of its object side surface (i.e., second object side surface) and its image side surface (i.e., second image side surface) in the extension direction of its optical axis.

[0127] 16. fl: effective focal length of the first lens.

[0128] 17. f2: effective focal length of the second lens.

[0129] 18. f12: effective focal length of the first lens to the second lens and the turning optical unit formed by the prisms therebetween.

[0130] 19. OBJ: object distance at which the optical system can achieve imaging.

[0131] 20. EFL: effective focal length of the optical system.

[0132] 21. EPD: entrance pupil diameter of the optical system.

[0133] Exemplary optical system

[0134] As shown in FIGS. 1-50, optical systems 100 according to embodiments of the present application are illustrated. For ease of description, the periscopic camera module is defined to extend and distribute along a first direction DL1, a second direction DL2 and a third direction DL3 which are perpendicular to each other. The periscopic camera module extending along the third direction DL3 defines the width of the periscopic camera module, extending along the second direction DL2 defines the length of the periscopic camera module, and extending along the first direction DL1 defines the height of the periscopic camera module. Accordingly, the length direction of the optical system 100 is consistent with the second direction DL2, and the height direction of the optical system 100 is consistent with the first direction DL1.

[0135] The optical system 100 is suitable for a periscopic camera module, adopts a specific optical design, can realize a large aperture, reduce the shoulder height of the lens group E20, and ensure the optical anti-shake performance of the periscopic camera module. Specifically, from the aspect of the optical path, the optical element capable of converging light is arranged on the light-in side of the prism E2, the light-in amount is increased, and the aperture is expanded; the optical system 100 benefits from the converging effect of light, the optical effective diameter of the lens group E20 is reduced, and the shoulder height of the lens group E20 is reduced; the optical element capable of expanding light is arranged on the light-out side of the prism E2, the light is expanded to a certain extent, the light tends to be parallel to the main optical axis L1 and is incident to the subsequent optical element, and the optical anti-shake performance of the periscopic camera module can be ensured, wherein the extension direction of the main optical axis L1 is consistent with the extension direction of the optical axis of the lens group E20, and is parallel to the second direction DL2; further, the optical parameters are designed to meet the requirements of the aperture, height, length, anti-shake performance and the like. In the present application, the shoulder height of the lens group E20 is determined by the maximum aperture of the lens group E20 in the height direction of the optical system 100.

[0136] The optical system 100 sequentially includes, from the object side to the image side: a first lens E1, a prism E2, a second lens E3, and a lens group E20. The first lens E1 has a positive focal power and is used for converging light. The prism E2 is used for turning the light to change the propagation path of the light. The second lens E3 has a negative focal power and is used for expanding the light. The lens group E20 includes a plurality of lenses arranged in sequence. A filter E30 and / or a photosensitive chip E40 can be sequentially arranged on the image side of the lens group E20. The photosensitive chip E40 has a photosensitive surface E401 and is used for receiving light from the lens group E20. The first lens E1, the prism E2, the second lens E3, the lens group E20 and the filter E30 are on the photosensitive path of the photosensitive chip E40. The filter E30 is used for filtering light emitted from the lens group E20.

[0137] In an embodiment of the present application, the lens group E20 includes a third lens E4, a fourth lens E5, a fifth lens E6, a sixth lens E7, and a seventh lens E8 arranged in sequence from the object side to the image side. The first lens E1 is close to the object side of the optical system 100; and the lens group E20 is close to the photosensitive chip E40.

[0138] When external light enters the optical system 100, the light first enters the first lens E1 from the first direction DL1, is collected by the first lens E1, and then enters the prism E2. The light is reflected by the prism E2 from the first direction DL1 to the second direction DL2, and then enters the second lens E3. Subsequently, the light is expanded by the second lens E3 from the second direction DL2, enters the lens group E20, and sequentially passes through the third lens E4, the fourth lens E5, the fifth lens E6, the sixth lens E7, and the seventh lens E8, and finally reaches the photosensitive chip E40.

[0139] Due to the collection of the light by the first lens E1, the light is still in a converging state after being reflected by the prism E2. Even if the light is subsequently expanded by the second lens E3, the aperture of the light when entering the lens group E20 is smaller than the aperture of the light when entering the first lens E1. Therefore, the optical effective diameter of the multiple lenses in the lens group E20 can be reduced, and the height of the lens group E20 can be reduced, thereby reducing the shoulder height of the lens group E20 in the optical system 100.

[0140] It can be understood that if the second lens E3 is not provided, the light is collected by the first lens E1 and then reaches the prism E2. After being reflected by the prism E2, the light directly reaches the lens group E20. When the light reaches the lens group E20, the light is still converging to the center. In this case, if the prism E2 is driven to achieve optical image stabilization, the prism E2 moves, and the deflection angles of the light in different directions at the edge are different. Specifically, because all the light converges to the center, but when the prism E2 is driven to move for optical image stabilization, all the light is offset in the same direction. Therefore, the deflection angles of the light in different directions at the edge after passing through the prism E2 are different, the drop value of the MTF of the optical system 100 is large, that is, the anti-shake sensitivity is high. Here, the MTF can be obtained by simulation of the optical system 100. The drop value of the MTF is the difference between the MTF and the static MTF design value under a unit angle of jitter, which can also be referred to as the optical image stabilization (OIS) sensitivity.

[0141] In the present application, the second lens E3 is arranged to expand the light rays passing through the second lens E3, so that the light rays exiting the second lens E3 are incident on the lens group E20 in a direction close to parallel to the main optical axis L1. It can be understood that because the light rays have been pre-expanded at the second lens E3, the light rays at each position of the edge propagate in a direction close to parallel to the main optical axis L1, so even when the prism E2 is driven to achieve optical image stabilization, the movement of the prism E2 has little effect on the position of the light rays on the lens group E20, the drop value of the MTF of the optical system 100 is small, that is, the image stabilization sensitivity is low.

[0142] The first lens E1 has a first object side E11 and a first image side E12. The second lens E3 has a second object side E31 and a second image side E32. The prism E2 has a first side E21, a second side E23, and a reflecting surface E22, wherein the reflecting surface E22 extends between the first side E21 and the second side E23. The first image side E12 of the first lens E1 is directed towards the first side E21 of the prism E2; the second object side E31 of the second lens E3 is directed towards the second side E23 of the prism E2.

[0143] Optionally, the first lens E1 is attached to the prism E2, or spaced apart from the prism E2.

[0144] When the first lens E1 is attached to the prism E2, the first lens E1 can be fixed to the prism E2 by an adhesive or other means, or can only be in contact with the prism E2 without being fixed to the prism E2.

[0145] When the first lens E1 is attached to the prism E2, the first image side E12 of the first lens E1 is in close contact with the first side E21 of the prism E2. In one example of the present application, the first side E21 of the prism E2 is a plane, and the first image side E12 of the first lens E1 is a plane. It can be understood that the first image side E12 of the first lens E1 can also be a non-plane, and only partially in contact with the first side E21 of the first lens E1.

[0146] Optionally, the first object side E11 of the first lens E1 has a convex surface shape, or is other types of curved surface capable of converging light rays.

[0147] Optionally, the second lens E3 is attached to the prism E2, or spaced apart from the prism E2.

[0148] When the second lens E3 is attached to the prism E2, the second lens E3 can be fixed to the prism E2 by an adhesive or other means, or can only be in contact with the prism E2 without being fixed to the prism E2.

[0149] When the second lens E3 is attached to the prism E2, the second object side surface E31 of the second lens E3 abuts against the second side surface E23 of the prism E2. In an example of the present application, the second side surface E23 of the prism E2 is a flat surface, and the second object side surface E31 of the second lens E3 is a flat surface. It should be understood that the second object side surface E31 of the second lens E3 can also be a non-flat surface and only partially abuts against the second side surface E23 of the first lens E1.

[0150] Optionally, the second image side surface E32 of the second lens E3 has a concave surface shape or other type of curved surface capable of expanding the light rays.

[0151] The effective diameter and central thickness of the first lens E1 affect the overall height, i.e., total height, of the optical system 100 and also affect the aperture of the optical system 100. In embodiments of the present application, the effective diameter and central thickness of the first lens E1 satisfy the following conditions:

[0152] 3.0 < D1 / CT1 < 12.5; in some embodiments of the present application, for example, embodiments 1 to 5, 3.0 < D1 / CT1 < 5.2; in other embodiments of the present application, for example, embodiments 6 to 10, 8.4 < D1 / CT1 < 12.5; wherein D1 represents the effective diameter of the first lens E1; CT1 represents the central thickness of the first lens E1; D1 / CT1 represents the ratio of D1 to CT1, i.e., the ratio of the effective diameter of the first lens E1 to the central thickness of the first lens E1, wherein the ratio of D1 to CT1 is the value obtained by D1 divided by CTI; the ratio of the effective diameter of the first lens E1 to the central thickness of the first lens E1 is the value obtained by the effective diameter of the first lens E1 divided by the central thickness of the first lens E1. The central thickness of the first lens E1 is equal to the distance between its object side surface (i.e., the first object side surface E11) and its image side surface (i.e., the first image side surface E12) in the extension direction of its optical axis. The extension direction of the optical axis of the first lens E1 is consistent with the first direction DL1.

[0153] When 3.0 < D1 / CT1 < 12.5, the optical system 100 can have a more compact structure while ensuring the machinability of the first lens E1, which is conducive to the shortening of the total height and the improvement of the aperture of the optical system 100.

[0154] The effective diameter and the center thickness of the second lens E3 affect the overall length, i.e., the total length, of the optical system 100, and also affect the optical image stabilization performance of the periscopic camera module. In the embodiments of the present application, the effective diameter and the center thickness of the second lens E3 satisfy the following conditions:

[0155] 2.2 < D2 / CT2 < 14.0; in some embodiments of the present application, for example, embodiments 1 to 5, 2.2 < D2 / CT2 < 4.0; in some other embodiments of the present application, for example, embodiments 6 to 10, 8.8 < D2 / CT2 < 14.0; wherein D2 represents the effective diameter of the second lens E3; CT2 represents the center thickness of the second lens E3; D2 / CT2 represents the ratio of D2 to CT2, i.e., the ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3, wherein the ratio of D2 to CT2 is the value obtained by D2 divided by CT2; the ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3 is the value obtained by the effective diameter of the second lens E3 divided by the center thickness of the second lens E3. The center thickness of the second lens E3 is equal to the distance between its object side surface, i.e., the second object side surface E31, and its image side surface, i.e., the second image side surface E32, in the extension direction of its optical axis. The extension direction of the optical axis of the second lens E3 is consistent with the second direction DL2.

[0156] When 2.2 < D2 / CT2 < 14.0, the optical system 100 can have a more compact structure under the premise of ensuring the processability of the second lens E3, which is conducive to the shortening of the total length of the optical system 100 and the improvement of the optical image stabilization performance of the periscopic camera module.

[0157] The effective focal length of the first lens E1 affects the power of the first lens E1 and the shoulder height of the lens group E20 of the optical system 100. In the embodiments of the present application, the effective focal length of the first lens E1 satisfies the following conditions:

[0158] 1.5 > f1 / EFL > 3.2; in some embodiments of the present application, for example, in Embodiments 1 to 5, 3.2 > f1 / EFL > 2.0; in some other embodiments of the present application, for example, in Embodiments 6 to 10, 2.8 > f1 / EFL > 1.5; wherein f1 represents the effective focal length of the first lens E1, EFL represents the effective focal length of the optical system 100; f1 / EFL represents the ratio of f1 to EFL, i.e., the ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100, wherein the ratio of f1 to EFL is the resulting value of f1 over EFL; the ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100 is the resulting value of the effective focal length of the first lens E1 over the effective focal length of the optical system 100.

[0159] When 1.5 > f1 / EFL > 3.2, the first lens E1 can be ensured to have sufficient refractive power, which helps to reduce the shoulder height of the lens group E20.

[0160] By controlling the effective focal length of the first lens E1 and the effective focal length of the second lens E3, the aperture and the anti-shake performance of the optical system 100 can be adjusted, and meanwhile, the total length of the lens group E20 of the optical system 100 and the shoulder height of the lens group E20 in the optical system 100 can also be affected. In the embodiments of the present application, the effective focal length of the first lens E1 and the effective focal length of the second lens E3 satisfy the following conditions:

[0161] 0.6 < |f1 / f2| < 1.7; in some embodiments of the present application, for example, in Embodiments 1 to 5, 1.2 < |f1 / f2| < 1.7; in some other embodiments of the present application, for example, in Embodiments 6 to 10, 0.6 < |f1 / f2| < 0.7; wherein f1 represents the effective focal length of the first lens E1; f2 represents the effective focal length of the second lens E3; f1 / f2 represents the ratio of f1 to f2, i.e., the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3, wherein the ratio of f1 to f2 is the resulting value of f1 over f2; the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3 is the resulting value of the effective focal length of the first lens E1 over the effective focal length of the second lens E3; |f1 / f2| represents the absolute value of the ratio of f1 to f2, i.e., the absolute value of the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3.

[0162] When 0.6 < |f1 / f2| < 1.7, the optical system 100 can meet the requirements of large aperture and anti-shake performance while shortening the total length of the lens group of the optical system 100 and the shoulder height of the lens group E20 in the optical system 100.

[0163] The effective focal length of the folding optical unit E10 formed by the first lens E1, the prism E2 and the second lens E3 affects the light converging ability of the folding optical unit E10 as a whole, the incident angle of the light rays entering the lens group E20, the shoulder height of the lens group E20 in the optical system 100, the height of the optical system 100, and the optical anti-shake performance of the periscopic camera module. In the embodiments of the present application, the effective focal length of the folding optical unit E10 satisfies the following condition:

[0164] -13.5 < f12 / EFL < 6.8; in some embodiments of the present application, for example, embodiments 1 to 5, -13.5 < f12 / EFL < -5.0; in other embodiments of the present application, for example, embodiments 6 to 10, 3.0 < f12 / EFL < 6.8; wherein f12 represents the effective focal length of the folding optical unit E10; f12 / EFL represents the ratio of f12 to EFL, i.e., the ratio of the effective focal length of the folding optical unit E10 to the effective focal length of the optical system 100; the ratio of f12 to EFL is the value obtained by f12 to EFL; the ratio of the effective focal length of the folding optical unit E10 to the effective focal length of the optical system 100 is the value obtained by the effective focal length of the folding optical unit E10 to the effective focal length of the optical system 100.

[0165] When -13.5 < f12 / EFL < 6.8, the folding optical unit E10 has a certain converging ability, which helps to reduce the shoulder height of the lens group E20 in the optical system 100 and ensure that the light rays enter the lens group E20 after passing through the folding optical unit E10 at a smaller angle with the extension direction of the principal optical axis L1, which helps to improve the anti-shake performance of the optical system 100.

[0166] A diaphragm E50 can be arranged on the object side of the third lens E4 of the lens group E20.

[0167] The optical parameters, such as optical power, focal length, etc., of the third lens E4, the fourth lens E5, the fifth lens E6, the sixth lens E7 and the seventh lens E8 can be configured according to requirements.

[0168] In one example of the present application, the third lens E4 has positive optical power, the fourth lens E5 has negative optical power, the fifth lens E6 can have positive optical power, the sixth lens E7 has negative optical power, and the seventh lens E8 has positive optical power.

[0169] In an example of the present application, the lens set E20 further comprises an eighth lens E9, the third lens E4 has positive refractive power, the fourth lens E5 has negative refractive power, the fifth lens E6 can have positive refractive power, the sixth lens E7 has negative refractive power, the seventh lens E8 has positive refractive power, and the eighth lens E9 has negative refractive power.

[0170] In an embodiment of the present application, the length of the optical system 100 in the extension direction of the set principal optical axis L1 thereof is defined as the length of the optical system 100. In an embodiment of the present application, the extension direction of the set principal optical axis L1 of the optical system 100 coincides with the extension direction of the optical axis of the lens set E20. The length direction of the optical system 100 coincides with the extension direction of the principal optical axis L1, and the height direction of the optical system 100 is perpendicular to the extension direction of the principal optical axis L1.

[0171] In an embodiment of the present application, the optical system 100 satisfies the following condition, so that the optical system 100 achieves long focal length while the total length is controlled within a certain range:

[0172] SL / EFL<1.7; in some embodiments of the present application, for example, embodiments 1 to 5, 1.1<SL / EFL<1.7; in other embodiments of the present application, for example, embodiments 6 to 10, SL / EFL<1.5; wherein SL represents the total length of the optical system 100 in the extension direction of the set principal optical axis L1 thereof, EFL represents the effective focal length of the optical system 100, SL / EFL represents the ratio of SL to EFL, i.e., the ratio of the total length of the optical system 100 in the extension direction of the set principal optical axis L1 thereof to the effective focal length of the optical system 100, the ratio of SL to EFL is the value obtained by comparing SL with EFL, and the ratio of the total length of the optical system 100 in the extension direction of the set principal optical axis L1 thereof to the effective focal length of the optical system 100 is the value obtained by comparing the total length of the optical system 100 in the extension direction of the set principal optical axis L1 thereof with the effective focal length of the optical system 100.

[0173] In an embodiment of the present application, the optical system 100 further satisfies the following condition, so that the optical system 100 achieves large aperture while the total length is controlled within a certain range:

[0174] 3.1 < SL / EPD < 5.4; in some embodiments of the present application, for example, in Embodiments 1-5, 3.2 < SL / EPD < 5.4; in some other embodiments of the present application, for example, in Embodiments 6-10, 3.1 < SL / EPD < 3.4; wherein SL represents the total length of the optical system 100 in the extension direction of the set principal optical axis L1 thereof; EPD represents the entrance pupil diameter of the optical system 100; SL / EPD represents the ratio of SL to EPD, i.e., the ratio of the total length of the optical system 100 in the extension direction of the set principal optical axis L1 thereof to the entrance pupil diameter of the optical system 100; the ratio of SL to EPD is the value obtained by SL divided by EPD; the ratio of the total length of the optical system 100 in the extension direction of the set principal optical axis L1 thereof to the entrance pupil diameter of the optical system 100 is the value obtained by the total length of the optical system 100 in the extension direction of the set principal optical axis L1 thereof divided by the entrance pupil diameter of the optical system 100.

[0175] In the embodiments of the present application, the optical system 100 also satisfies the following condition, so that the optical system 100 realizes a large aperture while the shoulder height is controlled within a certain range:

[0176] 0.38 < GH / EPD < 1.00; in some embodiments of the present application, for example, in Embodiments 1-5, 0.38 < GH / EPD < 0.45; in some other embodiments of the present application, for example, in Embodiments 6-10, 0.70 < GH / EPD < 1.00; further, in some embodiments of the present application, 0.70 < GH / EPD < 0.90; wherein GH represents the shoulder height of the lens group E20; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of GH to EPD, i.e., the ratio of the shoulder height of the lens group E20 to the entrance pupil diameter of the optical system 100; the ratio of GH to EPD is the value obtained by GH divided by EPD; the ratio of the shoulder height of the lens group E20 to the entrance pupil diameter of the optical system 100 is the value obtained by the shoulder height of the lens group E20 divided by the entrance pupil diameter of the optical system 100.

[0177] In the embodiments of the present application, the field of view angle of the optical system 100 is small, which is beneficial to imaging of a distant object and ensures the quality of long-distance imaging. Specifically, the field of view angle of the optical system 100 satisfies the following condition:

[0178] tanFOV < 0.65; in some embodiments of the present application, for example, embodiments 1-5, tanFOV < 0.55; in other embodiments of the present application, for example, embodiments 6-10, tanFOV < 0.65; wherein, FOV represents the field of view of the optical system 100; tanFOV represents the tangent value of FOV, i.e., the tangent value of the field of view of the optical system 100.

[0179] In the embodiments of the present application, the optical system 100 also satisfies the following conditions:

[0180] 12cm < OBJ < INF; in some embodiments of the present application, for example, embodiments 1-5, 12cm < OBJ < INF; in other embodiments of the present application, for example, embodiments 6-10, 16cm < OBJ < INF; wherein, OBJ represents the object distance that the optical system 100 can achieve imaging, and INF represents infinity, i.e., the optical system 100 can image under the condition that the object distance is greater than or equal to 16cm.

[0181] Those skilled in the art should understand that the optical system 100 can be combined with one or more housings and other necessary elements to form a periscopic camera module, so that the optical system 100 provided by the present application can be applied to electronic devices and smart terminals.

[0182] Correspondingly, the present application also provides a camera module, which comprises a housing and the optical system 100, wherein the optical system 100 is accommodated in the housing.

[0183] The following are 10 specific embodiments formed based on the design principle of the optical system 100. Those skilled in the art should understand that the following 10 specific embodiments are only examples and do not represent that the optical system 100 can only be configured in the following 10 embodiments. Table 1 shows the conditional expressions of embodiments 1-5. Table 12 shows the conditional expressions of embodiments 6-10.

[0184] Table 1

[0185] In each embodiment, the aspherical curve equation of each lens is represented as follows:

[0186] wherein, X represents the relative distance of the point on the aspherical surface with a distance Y from the optical axis to the tangent section of the intersection point tangent to the aspherical optical axis; Y represents the vertical distance of the point on the aspherical curve to the optical axis; R represents the radius of curvature; k represents the conic coefficient; and Ai represents the i-th order aspherical coefficient.

[0187] In the following tables, "Sphere" means a spherical surface; "Qcon Asphere" means an aspherical surface; and "Infinity" means infinity.

[0188] It is worth mentioning that the structure diagram of the optical system 100 and the parameters of each lens in each embodiment are generated by the optical design software. Accordingly, the parameters (e.g., focal length, radius of curvature, thickness, aspherical coefficient) of each lens in the optical design software and the graphics of each lens are generated synchronously and correspond to each other. Accordingly, the optical parameter table in each embodiment in the present application is consistent with the structure diagram of the corresponding optical system 100.

[0189] Regarding the relationship between the positive and negative of the focal length and the positive and negative of the optical power in the table, in the present application, due to the total reflection of the prism E21 to the light, the coordinate system after the prism E21 is flipped relative to the coordinate system of the prism E21 in the optical design software. Accordingly, the direction of light propagation before the prism E21 and the direction of light propagation after the prism E21 are different in coordinate expression, for example, the direction of light propagation before the prism E21 is the +z direction in the first coordinate system, and the direction of light propagation after the prism E21 is the -z direction in the second coordinate system.

[0190] The optical power is equal to the difference between the convergence degree of the image-side beam and the convergence degree of the object-side beam. Accordingly, when the convergence ability of the lens on the image side is greater than that on the object side, the optical power of the lens is positive, and when the convergence ability of the lens on the image side is less than that on the object side, the optical power of the lens is negative. The positive and negative of the optical power will not change due to the conversion of the coordinate system.

[0191] Accordingly, in the present application, before the prism E21, the positive direction of the coordinate system used to express the focal length is consistent with the direction of light propagation, and the positive and negative of the focal length are consistent with the positive and negative of the optical power; after the prism E21, the positive direction of the coordinate system used to express the focal length is opposite to the direction of light propagation, and the positive and negative of the focal length are opposite to the positive and negative of the optical power. The focal length is characterized by coordinates, and the positive and negative of the focal length will change with the conversion of the coordinate system.

[0192] With respect to the relationship between the positive or negative of the radius of curvature in the table and the concave or convex of the surface in the drawing, the object side surface of the lens protrudes to the object side as a convex surface, and protrudes to the image side as a concave surface; the image side surface of the lens protrudes to the object side as a concave surface, and protrudes to the image side as a convex surface; due to the above-mentioned flip of the coordinate system behind the prism E21 relative to the coordinate system of the prism E21 in the optical design software, correspondingly, in front of the prism E21, the object side surface or the image side surface of the lens protrudes to the object side, and the radius of curvature is positive, or the object side surface or the image side surface of the lens protrudes to the image side, and the radius of curvature is negative; behind the prism E21, the object side surface or the image side surface of the lens protrudes to the object side, and the radius of curvature is negative, or the object side surface or the image side surface of the lens protrudes to the image side, and the radius of curvature is positive.

[0193] It is worth mentioning that the radius of curvature is mainly based on the concave or convex degree of the central region of the lens, and not the entire surface. For aspherical surfaces, the effective diameter part outside the central region will present different surface types due to the aspherical surface formula.

[0194] Embodiment 1

[0195] An optical system 100 according to Embodiment 1 of the present application is described below with reference to the accompanying drawings of the present specification, FIG. 1 to FIG. 5. FIG. 1 shows a structural schematic diagram of the optical system 100 according to Embodiment 1 of the present application.

[0196] As shown in FIG. 1 and FIG. 2, the optical system 100 according to Embodiment 1 of the present application sequentially includes, from the object side to the image side, a first lens E1, a prism E2, a second lens E3, an aperture E50, a third lens E4, a fourth lens E5, a fifth lens E6, a sixth lens E7, a seventh lens E8, an eighth lens E9, a filter E30, and a photosensitive chip E40.

[0197] The first lens E1 has positive focal power. The first lens E1 has a first object side surface E11 and a first image side surface E12, wherein the first object side surface E11 of the first lens E1 is at least partially curved to the object side, and has a convex surface type, and the first image side surface E12 of the first lens E1 is a plane. The light rays incident through the first object side surface E11 of the first lens E1 along the height direction set by the optical system 100 are converged by the first object side surface E11 of the first lens E1, and are emitted through the first image side surface E12 of the first lens E1.

[0198] The prism E2 has a first side surface E21, a second side surface E23, and a reflection surface E22, wherein the reflection surface E22 extends between the first side surface E21 and the second side surface E23. The first side surface E21, the reflection surface E22, and the second side surface E23 of the prism E2 are all planar. The light rays exiting from the first image side surface E12 of the first lens E1 enter the prism E2 from the first side surface E21 of the prism E2, are reflected by the reflection surface E22 of the prism E2, and then exit from the second side surface E23 of the prism E2.

[0199] The second lens E3 has a negative focal power. The second lens E3 has a second object side surface E31 and a second image side surface E32, wherein the second object side surface E31 of the second lens E3 is planar, and the second image side surface E32 of the second lens E3 is at least partially curved towards the object side, having a surface shape of a concave surface. The light rays exiting from the second side surface E23 of the prism E2 enter the second lens E3 from the second object side surface E31 of the second lens E3, and exit from the second image side surface E32 of the second lens E3.

[0200] The third lens E4 has a positive focal power. The third lens E4 has a third object side surface E41 and a third image side surface E42, wherein the third object side surface E41 of the third lens E4 is at least partially curved towards the object side, having a surface shape of a convex surface, and the third image side surface E42 of the third lens E4 is at least partially curved towards the image side, having a surface shape of a convex surface. The light rays exiting from the second image side surface E32 of the second lens E3 pass through the diaphragm E50, enter the third lens E4 from the third object side surface E41 of the third lens E4, and exit from the third image side surface E42 of the third lens E4.

[0201] The fourth lens E5 has a negative focal power. The fourth lens E5 has a fourth object side surface E51 and a fourth image side surface E52, wherein the fourth object side surface E51 of the fourth lens E5 is at least partially curved towards the object side, having a surface shape of a convex surface, and the fourth image side surface E52 of the fourth lens E5 is at least partially curved towards the object side, having a surface shape of a concave surface. The light rays exiting from the third image side surface E42 of the third lens E4 enter the fourth lens E5 from the fourth object side surface E51 of the fourth lens E5, and exit from the fourth image side surface E52 of the fourth lens E5.

[0202] The fifth lens E6 has positive refractive power. The fifth lens E6 has a fifth object side E61 and a fifth image side E62, wherein the fifth object side E61 of the fifth lens E6 is curved at least in part towards the object side, has a face shape of a convex surface, the fifth image side E62 of the fifth lens E6 is curved at least in part towards the image side, has a face shape of a convex surface. Rays exiting from the fourth image side E52 of the fourth lens E5 enter the fifth lens E6 from the fifth object side E61 of the fifth lens E6 and exit from the fifth image side E62 of the fifth lens E6.

[0203] The sixth lens E7 has negative refractive power. The sixth lens E7 has a sixth object side E71 and a sixth image side E72, wherein the sixth object side E71 of the sixth lens E7 is curved at least in part towards the image side, has a face shape of a concave surface, the sixth image side E72 of the sixth lens E7 is curved at least in part towards the image side, has a face shape of a convex surface. Rays exiting from the fifth image side E62 of the fifth lens E6 enter the sixth lens E7 from the sixth object side E71 of the sixth lens E7 and exit from the sixth image side E72 of the sixth lens E7.

[0204] The seventh lens E8 has positive refractive power. The seventh lens E8 has a seventh object side E81 and a seventh image side E82, wherein the seventh object side E81 of the seventh lens E8 is curved at least in part towards the image side, has a face shape of a concave surface, the seventh image side E82 of the seventh lens E8 is curved at least in part towards the image side, has a face shape of a convex surface. Rays exiting from the sixth image side E72 of the sixth lens E7 enter the seventh lens E8 from the seventh object side E81 of the seventh lens E8 and exit from the seventh image side E82 of the seventh lens E8.

[0205] The eighth lens E9 has negative refractive power. The eighth lens E9 has an eighth object side E91 and an eighth image side E92, wherein the eighth object side E91 of the eighth lens E9 is curved at least in part towards the object side, has a face shape of a convex surface, the eighth image side E92 of the eighth lens E9 is curved at least in part towards the object side, has a face shape of a concave surface. Rays exiting from the seventh image side E82 of the seventh lens E8 enter the eighth lens E9 from the eighth object side E91 of the eighth lens E9 and exit from the eighth image side E92 of the eighth lens E9.

[0206] The filter E30 has a filter object side E301 and a filter image side E302. The photosensitive chip E40 has a photosensitive surface E401. Light rays exiting from the eighth image side E92 of the eighth lens E9 reach the photosensitive surface E401 of the photosensitive chip E40 after passing through the filter object side E301 and the filter image side E302 of the filter E30.

[0207] Table 2 shows specific optical parameters of various components of Example 1; Table 3 shows aspherical coefficients of various lenses of Example 1.

[0208] Table 2

[0209] In Example 1, EFL = 22.4 mm; Fno = 2.15; FOV = 28.06 degrees, where EFL represents an effective focal length of the optical system 100, Fno represents an aperture value of the optical system 100, where Fno is an abbreviation of f-number, and FOV represents a field of view angle of the optical system 100.

[0210] The effective diameter and the central thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 5.155; where D1 represents the effective diameter of the first lens E1; CT1 represents the central thickness of the first lens E1; and D1 / CT1 represents a ratio of the effective diameter of the first lens E1 to the central thickness of the first lens E1.

[0211] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.702; where f1 represents the effective focal length of the first lens E1, and EFL represents the effective focal length of the optical system 100; and f1 / EFL represents a ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100.

[0212] The effective diameter and the central thickness of the second lens E3 satisfy the following condition: D2 / CT2 = 3.945; where D2 represents the effective diameter of the second lens E3; CT2 represents the central thickness of the second lens E3; and D2 / CT2 represents a ratio of the effective diameter of the second lens E3 to the central thickness of the second lens E3.

[0213] The effective focal length of the first lens E1 and the second lens E3 satisfies the following condition: |f1 / f2|=1.612; wherein, f1 represents the effective focal length of the first lens E1; f2 represents the effective focal length of the second lens E3; f1 / f2 represents the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3; |f1 / f2| represents the absolute value of the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3.

[0214] The first lens E1, the prism E2 and the second lens E3 form a turning optical unit E10. The effective focal length of the turning optical unit E10 satisfies the following condition: f12 / EFL=-13.333; wherein, f12 represents the effective focal length of the turning optical unit E10; f12 / EFL represents the ratio of the effective focal length of the turning optical unit E10 to the effective focal length of the optical system 100.

[0215] Table 3

[0216] In embodiment 1, the optical system 100 satisfies the following conditions: SL / EFL=1.594; wherein, SL represents the total length of the optical system 100 in the extension direction of its set principal optical axis L1; EFL represents the effective focal length of the optical system 100; SL / EFL represents the ratio of the total length of the optical system 100 in the extension direction of its set principal optical axis L1 to the effective focal length of the optical system 100. SL / EPD=3.428; SL represents the total length of the optical system 100 in the extension direction of its set principal optical axis L1; EPD represents the entrance pupil diameter of the optical system 100; SL / EPD represents the ratio of the total length of the optical system 100 in the extension direction of its set principal optical axis L1 to the entrance pupil diameter of the optical system 100. GH / EPD=0.400; wherein, GH represents the shoulder height of the lens group E20; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lens group E20 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV=0.533; FOV represents the field of view angle of the optical system 100; tanFOV represents the tangent value of FOV, i.e. the tangent value of the field of view angle of the optical system 100. The optical system 100 satisfies the following condition: 12cm≤OBJ<INF; wherein, OBJ represents the object distance that the optical system 100 can realize imaging; INF represents infinity, i.e. the optical system 100 can image under the condition that the object distance is greater than or equal to 12cm.

[0217] Embodiment 2

[0218] The optical system 100 according to Embodiment 2 of the present application is described below with reference to FIGS. 6 to 10 of the accompanying drawings of the present application. FIG. 6 shows a structural schematic diagram of the optical system 100 according to Embodiment 2 of the present application.

[0219] As shown in FIGS. 6 and 7, the optical system 100 according to Embodiment 2 of the present application comprises, in order from the object side to the image side, a first lens E1, a prism E2, a second lens E3, an aperture stop E50, a third lens E4, a fourth lens E5, a fifth lens E6, a sixth lens E7, a seventh lens E8, an eighth lens E9, a filter E30, and a photosensitive chip E40.

[0220] The first lens E1 has positive refractive power. The first lens E1 has a first object side surface E11 and a first image side surface E12, wherein the first object side surface E11 of the first lens E1 is at least partially curved towards the object side, having a convex surface shape, and the first image side surface E12 of the first lens E1 is a plane. A light ray incident along a height direction of the optical system 100 through the first object side surface E11 of the first lens E1 is converged by the first object side surface E11 of the first lens E1 and exits through the first image side surface E12 of the first lens E1.

[0221] The prism E2 has a first side surface E21, a second side surface E23, and a reflection surface E22, wherein the reflection surface E22 extends between the first side surface E21 and the second side surface E23. The first side surface E21, the reflection surface E22, and the second side surface E23 of the prism E2 are all planes. A light ray exiting from the first image side surface E12 of the first lens E1 enters the prism E2 from the first side surface E21 of the prism E2, is reflected by the reflection surface E22 of the prism E2, and then exits from the second side surface E23 of the prism E2.

[0222] The second lens E3 has negative refractive power. The second lens E3 has a second object side surface E31 and a second image side surface E32, wherein the second object side surface E31 of the second lens E3 is a plane, and the second image side surface E32 of the second lens E3 is at least partially curved towards the object side, having a concave surface shape. A light ray exiting from the second side surface E23 of the prism E2 enters the second lens E3 from the second object side surface E31 of the second lens E3 and exits from the second image side surface E32 of the second lens E3.

[0223] The third lens E4 has positive refractive power. The third lens E4 has a third object side E41 and a third image side E42, wherein the third object side E41 of the third lens E4 is at least partially curved towards the object side, has the face type of a convex surface, and the third image side E42 of the third lens E4 is at least partially curved towards the image side, has the face type of a convex surface. Rays exiting from the second image side E32 of the second lens E3 pass the stop E50, enter the third lens E4 from the third object side E41 of the third lens E4, and exit from the third image side E42 of the third lens E4.

[0224] The fourth lens E5 has negative refractive power. The fourth lens E5 has a fourth object side E51 and a fourth image side E52, wherein the fourth object side E51 of the fourth lens E5 is at least partially curved towards the object side, has the face type of a convex surface, and the fourth image side E52 of the fourth lens E5 is at least partially curved towards the object side, has the face type of a concave surface. Rays exiting from the third image side E42 of the third lens E4 enter the fourth lens E5 from the fourth object side E51 of the fourth lens E5, and exit from the fourth image side E52 of the fourth lens E5.

[0225] The fifth lens E6 has positive refractive power. The fifth lens E6 has a fifth object side E61 and a fifth image side E62, wherein the fifth object side E61 of the fifth lens E6 is at least partially curved towards the object side, has the face type of a convex surface, and the fifth image side E62 of the fifth lens E6 is at least partially curved towards the image side, has the face type of a convex surface. Rays exiting from the fourth image side E52 of the fourth lens E5 enter the fifth lens E6 from the fifth object side E61 of the fifth lens E6, and exit from the fifth image side E62 of the fifth lens E6.

[0226] The sixth lens E7 has negative refractive power. The sixth lens E7 has a sixth object side E71 and a sixth image side E72, wherein the sixth object side E71 of the sixth lens E7 is at least partially curved towards the image side, has the face type of a concave surface, and the sixth image side E72 of the sixth lens E7 is at least partially curved towards the image side, has the face type of a convex surface. Rays exiting from the fifth image side E62 of the fifth lens E6 enter the sixth lens E7 from the sixth object side E71 of the sixth lens E7, and exit from the sixth image side E72 of the sixth lens E7.

[0227] The seventh lens E8 has positive refractive power. The seventh lens E8 has a seventh object-side surface E81 and a seventh image-side surface E82, wherein the seventh object-side surface E81 of the seventh lens E8 is at least partially curved towards the image side, has a surface type of concave, the seventh image-side surface E82 of the seventh lens E8 is at least partially curved towards the image side, has a surface type of convex. The light rays exiting from the sixth image-side surface E72 of the sixth lens E7 enter the seventh lens E8 from the seventh object-side surface E81 of the seventh lens E8, and exit from the seventh image-side surface E82 of the seventh lens E8.

[0228] The eighth lens E9 has negative refractive power. The eighth lens E9 has an eighth object-side surface E91 and an eighth image-side surface E92, wherein the eighth object-side surface E91 of the eighth lens E9 is at least partially curved towards the object side, has a surface type of convex, the eighth image-side surface E92 of the eighth lens E9 is at least partially curved towards the object side, has a surface type of concave. The light rays exiting from the seventh image-side surface E82 of the seventh lens E8 enter the eighth lens E9 from the eighth object-side surface E91 of the eighth lens E9, and exit from the eighth image-side surface E92 of the eighth lens E9.

[0229] The filter E30 has a filter object-side surface E301 and a filter image-side surface E302. The photosensitive chip E40 has a photosensitive surface E401. The light rays exiting from the eighth image-side surface E92 of the eighth lens E9 reach the photosensitive surface E401 of the photosensitive chip E40 after passing through the filter object-side surface E301 and the filter image-side surface E302 of the filter E30.

[0230] In embodiment 2, EFL = 22.5 mm; Fno = 2.23; FOV = 28.40 degrees, wherein EFL represents the effective focal length of the optical system 100, Fno represents the aperture value of the optical system 100, wherein Fno is the abbreviation of f-number, FOV represents the field of view angle of the optical system 100.

[0231] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 4.809; wherein D1 represents the effective diameter of the first lens E1; CT1 represents the center thickness of the first lens E1; D1 / CT1 represents the ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1.

[0232] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.693; wherein f1 represents the effective focal length of the first lens E1, EFL represents the effective focal length of the optical system 100; f1 / EFL represents the ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100.

[0233] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2 = 3.804; wherein D2 represents the effective diameter of the second lens E3; CT2 represents the center thickness of the second lens E3; D2 / CT2 represents the ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3.

[0234] The effective focal lengths of the first lens E1 and the second lens E3 satisfy the following condition: |f1 / f2| = 1.597; wherein f1 represents the effective focal length of the first lens E1; f2 represents the effective focal length of the second lens E3; f1 / f2 represents the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3; |f1 / f2| represents the absolute value of the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3.

[0235] The first lens E1, the prism E2 and the second lens E3 form a turning optical unit E10. The effective focal length of the turning optical unit E10 satisfies the following condition: f12 / EFL = -13.187; wherein f12 represents the effective focal length of the turning optical unit E10; f12 / EFL represents the ratio of the effective focal length of the turning optical unit E10 to the effective focal length of the optical system 100.

[0236] Table 4 shows the specific optical parameters of the various components of embodiment 2; Table 5 shows the aspherical coefficients of the various lenses of embodiment 2.

[0237] Table 4

[0238] In the embodiment 2, the optical system 100 satisfies the following conditions: SL / EFL = 1.556; wherein, SL represents the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100; EFL represents the effective focal length of the optical system 100; SL / EFL represents the ratio of the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 to the effective focal length of the optical system 100. SL / EPD = 3.466; SL represents the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; SL / EPD represents the ratio of the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 to the entrance pupil diameter of the optical system 100. GH / EPD = 0.404; wherein, GH represents the shoulder height of the lens group E20; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lens group E20 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV = 0.541; FOV represents the field of view angle of the optical system 100; tanFOV represents the tangent value of FOV, i.e., the tangent value of the field of view angle of the optical system 100. The optical system 100 satisfies the following condition: 12cm≤OBJ<INF; wherein, OBJ represents the object distance at which the optical system 100 can realize imaging; INF represents infinity, i.e., the optical system 100 can image under the condition that the object distance is greater than or equal to 12cm.

[0239] Embodiment 3

[0240] The optical system 100 according to the embodiment 3 of the present application is described below with reference to FIGS. 11 to 15 of the drawings of the present application. FIG. 11 shows a structural schematic diagram of the optical system 100 according to the embodiment 3 of the present application.

[0241] As shown in FIGS. 11 to 12, the optical system 100 according to the embodiment 3 of the present application sequentially comprises, from the object side to the image side, a first lens E1, a prism E2, a second lens E3, an aperture E50, a third lens E4, a fourth lens E5, a fifth lens E6, a sixth lens E7, a seventh lens E8, an eighth lens E9, a filter E30, and a photosensitive chip E40.

[0242] The first lens E1 has positive refractive power. The first lens E1 has a first object side E11 and a first image side E12, wherein the first object side E11 of the first lens E1 is at least partially curved towards the object side, has a face type of a convex surface, and the first image side E12 of the first lens E1 is a plane. A light ray incident along a height direction set by the optical system 100 through the first object side E11 of the first lens E1 is converged by the first object side E11 of the first lens E1 and exits through the first image side E12 of the first lens E1.

[0243] The prism E2 has a first side E21, a second side E23, and a reflection surface E22, wherein the reflection surface E22 extends between the first side E21 and the second side E23. The first side E21, the reflection surface E22, and the second side E23 of the prism E2 are all planes. A light ray exiting from the first image side E12 of the first lens E1 enters the prism E2 from the first side E21 of the prism E2, is reflected by the reflection surface E22 of the prism E2, and exits from the second side E23 of the prism E2.

[0244] Table 5

[0245] The second lens E3 has negative refractive power. The second lens E3 has a second object side E31 and a second image side E32, wherein the second object side E31 of the second lens E3 is a plane, and the second image side E32 of the second lens E3 is at least partially curved towards the object side, has a face type of a concave surface. A light ray exiting from the second side E23 of the prism E2 enters the second lens E3 from the second object side E31 of the second lens E3 and exits from the second image side E32 of the second lens E3.

[0246] The third lens E4 has positive refractive power. The third lens E4 has a third object side E41 and a third image side E42, wherein the third object side E41 of the third lens E4 is at least partially curved towards the object side, has a face type of a convex surface, and the third image side E42 of the third lens E4 is at least partially curved towards the image side, has a face type of a convex surface. A light ray exiting from the second image side E32 of the second lens E3 passes through the diaphragm E50, enters the third lens E4 from the third object side E41 of the third lens E4, and exits from the third image side E42 of the third lens E4.

[0247] The fourth lens E5 has negative refractive power. The fourth lens E5 has a fourth object side E51 and a fourth image side E52, wherein the fourth object side E51 of the fourth lens E5 is at least partially curved toward the object side, has a convex face type, and the fourth image side E52 of the fourth lens E5 is at least partially curved toward the object side, has a concave face type. The light rays exiting from the third image side E42 of the third lens E4 enter the fourth lens E5 from the fourth object side E51 of the fourth lens E5, and exit from the fourth image side E52 of the fourth lens E5.

[0248] The fifth lens E6 has positive refractive power. The fifth lens E6 has a fifth object side E61 and a fifth image side E62, wherein the fifth object side E61 of the fifth lens E6 is at least partially curved toward the object side, has a convex face type, and the fifth image side E62 of the fifth lens E6 is at least partially curved toward the image side, has a convex face type. The light rays exiting from the fourth image side E52 of the fourth lens E5 enter the fifth lens E6 from the fifth object side E61 of the fifth lens E6, and exit from the fifth image side E62 of the fifth lens E6.

[0249] The sixth lens E7 has negative refractive power. The sixth lens E7 has a sixth object side E71 and a sixth image side E72, wherein the sixth object side E71 of the sixth lens E7 is at least partially curved toward the image side, has a concave face type, and the sixth image side E72 of the sixth lens E7 is at least partially curved toward the image side, has a convex face type. The light rays exiting from the fifth image side E62 of the fifth lens E6 enter the sixth lens E7 from the sixth object side E71 of the sixth lens E7, and exit from the sixth image side E72 of the sixth lens E7.

[0250] The seventh lens E8 has positive refractive power. The seventh lens E8 has a seventh object side E81 and a seventh image side E82, wherein the seventh object side E81 of the seventh lens E8 is at least partially curved toward the image side, has a concave face type, and the seventh image side E82 of the seventh lens E8 is at least partially curved toward the image side, has a convex face type. The light rays exiting from the sixth image side E72 of the sixth lens E7 enter the seventh lens E8 from the seventh object side E81 of the seventh lens E8, and exit from the seventh image side E82 of the seventh lens E8.

[0251] The eighth lens E9 has negative refractive power. The eighth lens E9 has an eighth object side E91 and an eighth image side E92, wherein the eighth object side E91 of the eighth lens E9 is curved at least in part towards the object side with a convex surface shape, and the eighth image side E92 of the eighth lens E9 is curved at least in part towards the object side with a concave surface shape. Light rays exiting from the seventh image side E82 of the seventh lens E8 enter the eighth lens E9 from the eighth object side E91 of the eighth lens E9 and exit from the eighth image side E92 of the eighth lens E9. The filter E30 has a filter object side E301 and a filter image side E302. The photosensitive chip E40 has a photosensitive surface E401. Light rays exiting from the eighth image side E92 of the eighth lens E9 reach the photosensitive surface E401 of the photosensitive chip E40 after passing through the filter object side E301 and the filter image side E302 of the filter E30.

[0252] Table 6 shows specific optical parameters of various components of Example 3; Table 7 shows aspherical coefficients of various lenses of Example 3.

[0253] Table 6

[0254] In Example 3, EFL = 21.4 mm; Fno = 2.12; FOV = 28.98 degrees, wherein EFL represents an effective focal length of the optical system 100, Fno represents an aperture value of the optical system 100, wherein Fno is an abbreviation of f-number, and FOV represents a field of view angle of the optical system 100.

[0255] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 4.810; wherein D1 represents the effective diameter of the first lens E1; CT1 represents the center thickness of the first lens E1; and D1 / CT1 represents a ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1.

[0256] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.973; wherein f1 represents the effective focal length of the first lens E1, and EFL represents the effective focal length of the optical system 100; and f1 / EFL represents a ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100.

[0257] An effective diameter and a center thickness of the second lens E3 satisfy the following condition: D2 / CT2 = 3.833; wherein D2 represents the effective diameter of the second lens E3; CT2 represents the center thickness of the second lens E3; D2 / CT2 represents a ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3.

[0258] Table 7

[0259] An effective focal length of the first lens E1 and the second lens E3 satisfy the following condition: |f1 / f2| = 1.584; wherein f1 represents the effective focal length of the first lens E1; f2 represents the effective focal length of the second lens E3; f1 / f2 represents a ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3; |f1 / f2| represents an absolute value of the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3.

[0260] The first lens E1, the prism E2, and the second lens E3 form a turning optical unit E10. An effective focal length of the turning optical unit E10 satisfy the following condition: f12 / EFL = -14.837; wherein f12 represents the effective focal length of the turning optical unit E10; f12 / EFL represents a ratio of the effective focal length of the turning optical unit E10 to the effective focal length of the optical system 100.

[0261] In Embodiment 3, the optical system 100 satisfies the following conditions: SL / EFL = 1.632; wherein, SL represents the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100; EFL represents the effective focal length of the optical system 100; SL / EFL represents the ratio of the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 to the effective focal length of the optical system 100. SL / EPD = 3.457; SL represents the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; SL / EPD represents the ratio of the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 to the entrance pupil diameter of the optical system 100. GH / EPD = 0.408; wherein, GH represents the shoulder height of the lens group E20; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lens group E20 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV = 0.554; FOV represents the field of view angle of the optical system 100; tanFOV represents the tangent value of FOV, i.e., the tangent value of the field of view angle of the optical system 100. The optical system 100 satisfies the following condition: 12cm ≤ OBJ < INF; wherein, OBJ represents the object distance at which the optical system 100 can realize imaging; INF represents infinity, i.e., the optical system 100 is capable of imaging under the condition that the object distance is greater than or equal to 12cm.

[0262] Embodiment 4

[0263] The optical system 100 according to Embodiment 4 of the present application is described below with reference to FIGS. 16 to 20 of the accompanying drawings of the present application. FIG. 16 shows a structural schematic diagram of the optical system 100 according to Embodiment 4 of the present application.

[0264] As shown in FIGS. 16 and 17, the optical system 100 according to Embodiment 4 of the present application sequentially comprises, from the object side to the image side, a first lens E1, a prism E2, a second lens E3, an aperture stop E50, a third lens E4, a fourth lens E5, a fifth lens E6, a sixth lens E7, a seventh lens E8, a filter E30, and a photosensitive chip E40.

[0265] The first lens E1 has positive refractive power. The first lens E1 has a first object side E11 and a first image side E12, wherein the first object side E11 of the first lens E1 is at least partially curved towards the object side, has a face type of a convex surface, and the first image side E12 of the first lens E1 is a plane. A light ray incident through the first object side E11 of the first lens E1 along a height direction set by the optical system 100 is converged by the first object side E11 of the first lens E1 and exits through the first image side E12 of the first lens E1.

[0266] The prism E2 has a first side E21, a second side E23 and a reflection surface E22, wherein the reflection surface E22 extends between the first side E21 and the second side E23. The first side E21, the reflection surface E22 and the second side E23 of the prism E2 are all planes. A light ray exiting from the first image side E12 of the first lens E1 enters the prism E2 from the first side E21 of the prism E2, is reflected by the reflection surface E22 of the prism E2 and exits from the second side E23 of the prism E2.

[0267] The second lens E3 has negative refractive power. The second lens E3 has a second object side E31 and a second image side E32, wherein the second object side E31 of the second lens E3 is a plane and the second image side E32 of the second lens E3 is at least partially curved towards the object side, has a face type of a concave surface. A light ray exiting from the second side E23 of the prism E2 enters the second lens E3 from the second object side E31 of the second lens E3 and exits from the second image side E32 of the second lens E3.

[0268] The third lens E4 has positive refractive power. The third lens E4 has a third object side E41 and a third image side E42, wherein the third object side E41 of the third lens E4 is at least partially curved towards the object side, has a face type of a convex surface, and the third image side E42 of the third lens E4 is at least partially curved towards the object side, has a face type of a concave surface. A light ray exiting from the second image side E32 of the second lens E3 passes through the diaphragm E50, enters the third lens E4 from the third object side E41 of the third lens E4 and exits from the third image side E42 of the third lens E4.

[0269] The fourth lens E5 has negative refractive power. The fourth lens E5 has a fourth object side E51 and a fourth image side E52, wherein the fourth object side E51 of the fourth lens E5 is at least partially curved toward the object side, has a convex face type, and the fourth image side E52 of the fourth lens E5 is at least partially curved toward the object side, has a concave face type. The light rays exiting from the third image side E42 of the third lens E4 enter the fourth lens E5 from the fourth object side E51 of the fourth lens E5, and exit from the fourth image side E52 of the fourth lens E5.

[0270] The fifth lens E6 has positive refractive power. The fifth lens E6 has a fifth object side E61 and a fifth image side E62, wherein the fifth object side E61 of the fifth lens E6 is at least partially curved toward the object side, has a convex face type, and the fifth image side E62 of the fifth lens E6 is at least partially curved toward the image side, has a convex face type. The light rays exiting from the fourth image side E52 of the fourth lens E5 enter the fifth lens E6 from the fifth object side E61 of the fifth lens E6, and exit from the fifth image side E62 of the fifth lens E6.

[0271] The sixth lens E7 has positive refractive power. The sixth lens E7 has a sixth object side E71 and a sixth image side E72, wherein the sixth object side E71 of the sixth lens E7 is at least partially curved toward the image side, has a concave face type, and the sixth image side E72 of the sixth lens E7 is at least partially curved toward the image side, has a convex face type. The light rays exiting from the fifth image side E62 of the fifth lens E6 enter the sixth lens E7 from the sixth object side E71 of the sixth lens E7, and exit from the sixth image side E72 of the sixth lens E7.

[0272] The seventh lens E8 has negative refractive power. The seventh lens E8 has a seventh object side E81 and a seventh image side E82, wherein the seventh object side E81 of the seventh lens E8 is at least partially curved toward the object side, has a convex face type, and the seventh image side E82 of the seventh lens E8 is at least partially curved toward the object side, has a concave face type. The light rays exiting from the sixth image side E72 of the sixth lens E7 enter the seventh lens E8 from the seventh object side E81 of the seventh lens E8, and exit from the seventh image side E82 of the seventh lens E8.

[0273] The filter E30 has a filter object side E301 and a filter image side E302. The photosensitive chip E40 has a photosensitive surface E401. Light rays exiting from the seventh image side E82 of the seventh lens E8 reach the photosensitive surface E401 of the photosensitive chip E40 after passing through the filter object side E301 and the filter image side E302 of the filter E30.

[0274] In embodiment 4, EFL=18.32 mm; Fno=3.23; FOV=22.27 degrees, wherein EFL represents an effective focal length of the optical system 100, Fno represents an aperture value of the optical system 100, wherein Fno is an abbreviation of f-number, and FOV represents a field of view angle of the optical system 100.

[0275] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1=3.111; wherein D1 represents the effective diameter of the first lens E1; CT1 represents the center thickness of the first lens E1; and D1 / CT1 represents a ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1.

[0276] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL=2.677; wherein f1 represents the effective focal length of the first lens E1, and EFL represents the effective focal length of the optical system 100; and f1 / EFL represents a ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100.

[0277] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2=2.387; wherein D2 represents the effective diameter of the second lens E3; CT2 represents the center thickness of the second lens E3; and D2 / CT2 represents a ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3.

[0278] Table 8

[0279] Table 9

[0280] The effective focal length of the first lens E1 and the second lens E3 satisfies the following condition: |f1 / f2|=1.478; where f1 represents the effective focal length of the first lens E1; f2 represents the effective focal length of the second lens E3; f1 / f2 represents the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3; |f1 / f2| represents the absolute value of the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3. The first lens E1, the prism E2 and the second lens E3 form a turning optical unit E10. The effective focal length of the turning optical unit E10 satisfies the following condition: f12 / EFL=-10.195; where f12 represents the effective focal length of the turning optical unit E10; f12 / EFL represents the ratio of the effective focal length of the turning optical unit E10 to the effective focal length of the optical system 100.

[0281] In embodiment 4, the optical system 100 satisfies the following condition: SL / EFL=1.604; where SL represents the total length of the optical system 100 in the extension direction of its set principal optical axis L1; EFL represents the effective focal length of the optical system 100; SL / EFL represents the ratio of the total length of the optical system 100 in the extension direction of its set principal optical axis L1 to the effective focal length of the optical system 100. SL / EPD=5.183; where SL represents the total length of the optical system 100 in the extension direction of its set principal optical axis L1; EPD represents the entrance pupil diameter of the optical system 100; SL / EPD represents the ratio of the total length of the optical system 100 in the extension direction of its set principal optical axis L1 to the entrance pupil diameter of the optical system 100. GH / EPD=0.425; where GH represents the shoulder height of the lens group E20; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lens group E20 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV=0.410; FOV represents the field of view angle of the optical system 100; tanFOV represents the tangent value of FOV, i.e. the tangent value of the field of view angle of the optical system 100. The optical system 100 satisfies the following condition: 30cm≤OBJ<INF; where OBJ represents the object distance that the optical system 100 can realize imaging; INF represents infinity, i.e. the optical system 100 can image under the condition that the object distance is greater than or equal to 30cm.

[0282] Embodiment 5

[0283] An optical system 100 according to Embodiment 5 of the present application is described below with reference to FIGS. 21 to 25 of the accompanying drawings of the present application. FIG. 21 shows a structural schematic diagram of the optical system 100 according to Embodiment 5 of the present application.

[0284] As shown in FIGS. 21 and 22, the optical system 100 according to Embodiment 5 of the present application sequentially includes, from the object side to the image side, a first lens E1, a prism E2, a second lens E3, a diaphragm E50, a third lens E4, a fourth lens E5, a fifth lens E6, a sixth lens E7, a seventh lens E8, a filter E30, and a photosensitive chip E40.

[0285] The first lens E1 has positive refractive power. The first lens E1 has a first object side surface E11 and a first image side surface E12, wherein the first object side surface E11 of the first lens E1 is at least partially curved toward the object side, has a convex surface shape, and the first image side surface E12 of the first lens E1 is a plane. A light ray incident along a height direction of the optical system 100 through the first object side surface E11 of the first lens E1 is converged by the first object side surface E11 of the first lens E1 and exits through the first image side surface E12 of the first lens E1.

[0286] The prism E2 has a first side surface E21, a second side surface E23, and a reflection surface E22, wherein the reflection surface E22 extends between the first side surface E21 and the second side surface E23. The first side surface E21, the reflection surface E22, and the second side surface E23 of the prism E2 are all planes. A light ray exiting from the first image side surface E12 of the first lens E1 enters the prism E2 from the first side surface E21 of the prism E2, is reflected at the reflection surface E22 of the prism E2, and then exits from the second side surface E23 of the prism E2.

[0287] The second lens E3 has negative refractive power. The second lens E3 has a second object side surface E31 and a second image side surface E32, wherein the second object side surface E31 of the second lens E3 is a plane, and the second image side surface E32 of the second lens E3 is at least partially curved toward the object side, has a concave surface shape. A light ray exiting from the second side surface E23 of the prism E2 enters the second lens E3 from the second object side surface E31 of the second lens E3 and exits from the second image side surface E32 of the second lens E3.

[0288] The third lens E4 has positive refractive power. The third lens E4 has a third object side E41 and a third image side E42, wherein the third object side E41 of the third lens E4 is at least partially curved towards the object side, has the face type of a convex surface, and the third image side E42 of the third lens E4 is at least partially curved towards the image side, has the face type of a convex surface. Rays exiting from the second image side E32 of the second lens E3 pass the stop E50, enter the third lens E4 from the third object side E41 of the third lens E4, and exit from the third image side E42 of the third lens E4.

[0289] The fourth lens E5 has negative refractive power. The fourth lens E5 has a fourth object side E51 and a fourth image side E52, wherein the fourth object side E51 of the fourth lens E5 is at least partially curved towards the object side, has the face type of a convex surface, and the fourth image side E52 of the fourth lens E5 is at least partially curved towards the object side, has the face type of a concave surface. Rays exiting from the third image side E42 of the third lens E4 enter the fourth lens E5 from the fourth object side E51 of the fourth lens E5, and exit from the fourth image side E52 of the fourth lens E5.

[0290] The fifth lens E6 has positive refractive power. The fifth lens E6 has a fifth object side E61 and a fifth image side E62, wherein the fifth object side E61 of the fifth lens E6 is at least partially curved towards the object side, has the face type of a convex surface, and the fifth image side E62 of the fifth lens E6 is at least partially curved towards the image side, has the face type of a convex surface. Rays exiting from the fourth image side E52 of the fourth lens E5 enter the fifth lens E6 from the fifth object side E61 of the fifth lens E6, and exit from the fifth image side E62 of the fifth lens E6.

[0291] The sixth lens E7 has positive refractive power. The sixth lens E7 has a sixth object side E71 and a sixth image side E72, wherein the sixth object side E71 of the sixth lens E7 is at least partially curved towards the image side, has the face type of a concave surface, and the sixth image side E72 of the sixth lens E7 is at least partially curved towards the image side, has the face type of a convex surface. Rays exiting from the fifth image side E62 of the fifth lens E6 enter the sixth lens E7 from the sixth object side E71 of the sixth lens E7, and exit from the sixth image side E72 of the sixth lens E7.

[0292] The seventh lens E8 has negative refractive power. The seventh lens E8 has a seventh object side E81 and a seventh image side E82, wherein the seventh object side E81 of the seventh lens E8 is at least in part curved towards the object side, has a face type of convex surface, the seventh image side E82 of the seventh lens E8 is at least in part curved towards the object side, has a face type of concave surface. The light rays exiting from the sixth image side E72 of the sixth lens E7 enter the seventh lens E8 from the seventh object side E81 of the seventh lens E8, and exit from the seventh image side E82 of the seventh lens E8.

[0293] The filter E30 has a filter object side E301 and a filter image side E302. The photosensitive chip E40 has a photosensitive surface E401. The light rays exiting from the seventh image side E82 of the seventh lens E8 reach the photosensitive surface E401 of the photosensitive chip E40 after passing through the filter object side E301 and the filter image side E302 of the filter E30.

[0294] In embodiment 5, EFL=20.03 mm; Fno=3.53; FOV=22.1 degrees, wherein EFL represents the effective focal length of the optical system 100, Fno represents the aperture value of the optical system 100, wherein Fno is the abbreviation of f-number, FOV represents the field of view angle of the optical system 100.

[0295] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1=3.104; wherein D1 represents the effective diameter of the first lens E1; CT1 represents the center thickness of the first lens E1; D1 / CT1 represents the ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1.

[0296] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL=2.142; wherein f1 represents the effective focal length of the first lens E1, EFL represents the effective focal length of the optical system 100; f1 / EFL represents the ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100.

[0297] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2=2.335; wherein D2 represents the effective diameter of the second lens E3; CT2 represents the center thickness of the second lens E3; D2 / CT2 represents the ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3.

[0298] The effective focal length of the first lens E1 and the second lens E3 satisfies the following condition: |f1 / f2|=1.347; wherein f1 represents the effective focal length of the first lens E1; f2 represents the effective focal length of the second lens E3; f1 / f2 represents the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3; |f1 / f2| represents the absolute value of the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3. The first lens E1, the prism E2 and the second lens E3 form a folded optical unit E10.

[0299] Table 10

[0300] The effective focal length of the folded optical unit E10 satisfies the following condition: f12 / EFL=-5.303; wherein f12 represents the effective focal length of the folded optical unit E10; f12 / EFL represents the ratio of the effective focal length of the folded optical unit E10 to the effective focal length of the optical system 100.

[0301] Table 10 shows the specific optical parameters of the various components of embodiment 5; Table 11 shows the aspherical coefficients of the various lenses of embodiment 5.

[0302] In Embodiment 5, the optical system 100 satisfies the following conditions: SL / EFL = 1.370; wherein, SL represents the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100; EFL represents the effective focal length of the optical system 100; SL / EFL represents the ratio of the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 to the effective focal length of the optical system 100. SL / EPD = 4.839; wherein, SL represents the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; SL / EPD represents the ratio of the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 to the entrance pupil diameter of the optical system 100. GH / EPD = 0.426; wherein, GH represents the shoulder height of the lens group E20; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lens group E20 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV = 0.406; FOV represents the field of view angle of the optical system 100; tanFOV represents the tangent value of FOV, i.e., the tangent value of the field of view angle of the optical system 100. The optical system 100 satisfies the following condition: 50cm ≤ OBJ < INF; wherein, OBJ represents the object distance at which the optical system 100 can realize imaging; INF represents infinity, i.e., the optical system 100 can image under the condition that the object distance is greater than or equal to 50cm.

[0303] Table 11

[0304] Table 12

[0305] Embodiment 6

[0306] The optical system 100 according to Embodiment 6 of the present application is described below with reference to FIGS. 26 to 30 of the drawings accompanying the present specification. FIG. 1 shows a structural schematic diagram of the optical system 100 according to Embodiment 1 of the present application.

[0307] As shown in FIGS. 26 and 27, the optical system 100 according to Embodiment 6 of the present application sequentially includes, from the object side to the image side, a first lens E1, a prism E2, a second lens E3, an aperture stop E50, a third lens E4, a fourth lens E5, a fifth lens E6, a sixth lens E7, a seventh lens E8, an eighth lens E9, a filter E30, and a photosensitive chip E40.

[0308] The first lens E1 has positive refractive power. The first lens E1 has a first object side E11 and a first image side E12, wherein the first object side E11 of the first lens E1 is at least partially curved towards the object side, has a face type of a convex surface, and the first image side E12 of the first lens E1 is a plane. A light ray incident along a height direction set by the optical system 100 through the first object side E11 of the first lens E1 is converged by the first object side E11 of the first lens E1 and exits through the first image side E12 of the first lens E1.

[0309] The prism E2 has a first side E21, a second side E23 and a reflection surface E22, wherein the reflection surface E22 extends between the first side E21 and the second side E23. The first side E21, the reflection surface E22 and the second side E23 of the prism E2 are all planes. A light ray exiting from the first image side E12 of the first lens E1 enters the prism E2 from the first side E21 of the prism E2, is reflected by the reflection surface E22 of the prism E2 and exits from the second side E23 of the prism E2.

[0310] The second lens E3 has negative refractive power. The second lens E3 has a second object side E31 and a second image side E32, wherein the second object side E31 of the second lens E3 is a plane and the second image side E32 of the second lens E3 is at least partially curved towards the object side, has a face type of a concave surface. A light ray exiting from the second side E23 of the prism E2 enters the second lens E3 from the second object side E31 of the second lens E3 and exits from the second image side E32 of the second lens E3.

[0311] The third lens E4 has positive refractive power. The third lens E4 has a third object side E41 and a third image side E42, wherein the third object side E41 of the third lens E4 is at least partially curved towards the object side, has a face type of a convex surface, and the third image side E42 of the third lens E4 is at least partially curved towards the image side, has a face type of a convex surface. A light ray exiting from the second image side E32 of the second lens E3 passes through the diaphragm E50, enters the third lens E4 from the third object side E41 of the third lens E4 and exits from the third image side E42 of the third lens E4.

[0312] The fourth lens E5 has negative refractive power. The fourth lens E5 has a fourth object side E51 and a fourth image side E52, wherein the fourth object side E51 of the fourth lens E5 is at least partially curved toward the image side, has a surface shape of a concave surface, the fourth image side E52 of the fourth lens E5 is at least partially curved toward the object side, has a surface shape of a concave surface. The light rays exiting from the third image side E42 of the third lens E4 enter the fourth lens E5 from the fourth object side E51 of the fourth lens E5, and exit from the fourth image side E52 of the fourth lens E5.

[0313] The fifth lens E6 has positive refractive power. The fifth lens E6 has a fifth object side E61 and a fifth image side E62, wherein the fifth object side E61 of the fifth lens E6 is at least partially curved toward the object side, has a surface shape of a convex surface, the fifth image side E62 of the fifth lens E6 is at least partially curved toward the image side, has a surface shape of a convex surface. The light rays exiting from the fourth image side E52 of the fourth lens E5 enter the fifth lens E6 from the fifth object side E61 of the fifth lens E6, and exit from the fifth image side E62 of the fifth lens E6.

[0314] The sixth lens E7 has negative refractive power. The sixth lens E7 has a sixth object side E71 and a sixth image side E72, wherein the sixth object side E71 of the sixth lens E7 is at least partially curved toward the object side, has a surface shape of a convex surface, the sixth image side E72 of the sixth lens E7 is at least partially curved toward the object side, has a surface shape of a concave surface. The light rays exiting from the fifth image side E62 of the fifth lens E6 enter the sixth lens E7 from the sixth object side E71 of the sixth lens E7, and exit from the sixth image side E72 of the sixth lens E7.

[0315] The seventh lens E8 has positive refractive power. The seventh lens E8 has a seventh object side E81 and a seventh image side E82, wherein the seventh object side E81 of the seventh lens E8 is at least partially curved toward the image side, has a surface shape of a concave surface, the seventh image side E82 of the seventh lens E8 is at least partially curved toward the image side, has a surface shape of a convex surface. The light rays exiting from the sixth image side E72 of the sixth lens E7 enter the seventh lens E8 from the seventh object side E81 of the seventh lens E8, and exit from the seventh image side E82 of the seventh lens E8.

[0316] The eighth lens E9 has negative refractive power. The eighth lens E9 has an eighth object side E91 and an eighth image side E92, wherein the eighth object side E91 of the eighth lens E9 is at least partially curved towards the object side, has a convex surface shape, and the eighth image side E92 of the eighth lens E9 is at least partially curved towards the object side, has a concave surface shape. Rays exiting from the seventh image side E82 of the seventh lens E8 enter the eighth lens E9 from the eighth object side E91 of the eighth lens E9 and exit from the eighth image side E92 of the eighth lens E9.

[0317] The filter E30 has a filter object side E301 and a filter image side E302. The photosensitive chip E40 has a photosensitive surface E401. Rays exiting from the eighth image side E92 of the eighth lens E9 reach the photosensitive surface E401 of the photosensitive chip E40 after passing the filter object side E301 and the filter image side E302 of the filter E30.

[0318] Table 13 shows specific optical parameters of various components of embodiment 6; Table 14 shows aspherical coefficients of various lenses of embodiment 6.

[0319] In embodiment 6, EFL = 21.3 mm; Fno = 2.4; FOV = 27.5 degrees, wherein EFL denotes the effective focal length of the optical system 100, Fno denotes the aperture value of the optical system 100, wherein Fno is an abbreviation for f-number, and FOV denotes the field of view angle of the optical system 100.

[0320] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 9.270; wherein D1 denotes the effective diameter of the first lens E1; CT1 denotes the center thickness of the first lens E1; and D1 / CT1 denotes the ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1.

[0321] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 1.761; wherein f1 denotes the effective focal length of the first lens E1, and EFL denotes the effective focal length of the optical system 100; and f1 / EFL denotes the ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100.

[0322] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2 = 10.782; wherein D2 denotes the effective diameter of the second lens E3; CT2 denotes the center thickness of the second lens E3; and D2 / CT2 denotes the ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3.

[0323] The effective focal length of the first lens E1 and the second lens E3 satisfies the following condition: |f1 / f2|=0.622; wherein, f1 represents the effective focal length of the first lens E1; f2 represents the effective focal length of the second lens E3; f1 / f2 represents the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3; |f1 / f2| represents the absolute value of the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3.

[0324] The first lens E1, the prism E2 and the second lens E3 form a turning optical unit E10. The effective focal length of the turning optical unit E10 satisfies the following condition: f12 / EFL=3.577; wherein, f12 represents the effective focal length of the turning optical unit E10; f12 / EFL represents the ratio of the effective focal length of the turning optical unit E10 to the effective focal length of the optical system 100.

[0325] Table 13

[0326] In embodiment 6, the optical system 100 satisfies the following condition: SL / EFL=1.366; wherein, SL represents the total length of the optical system 100 in the extension direction of its set principal optical axis L1; EFL represents the effective focal length of the optical system 100; SL / EFL represents the ratio of the total length of the optical system 100 in the extension direction of its set principal optical axis L1 to the effective focal length of the optical system 100. SL / EPD=3.208; SL represents the total length of the optical system 100 in the extension direction of its set principal optical axis L1; EPD represents the entrance pupil diameter of the optical system 100; SL / EPD represents the ratio of the total length of the optical system 100 in the extension direction of its set principal optical axis L1 to the entrance pupil diameter of the optical system 100. GH / EPD=0.819; wherein, GH represents the shoulder height of the lens group E20; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lens group E20 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV=0.521; FOV represents the field of view angle of the optical system 100; tanFOV represents the tangent value of FOV, i.e. the tangent value of the field of view angle of the optical system 100. The optical system 100 satisfies the following condition: 16cm≤OBJ<INF; wherein, OBJ represents the object distance which the optical system 100 can realize imaging; INF represents infinity, i.e. the optical system 100 can image under the condition that the object distance is greater than or equal to 16cm.

[0327] Table 14

[0328] Embodiment 7

[0329] The optical system 100 according to Embodiment 7 of the present application is described below with reference to FIGS. 31 to 35 of the accompanying drawings of the present application. FIG. 31 shows a structural schematic diagram of the optical system 100 according to Embodiment 7 of the present application.

[0330] As shown in FIGS. 31 and 32, the optical system 100 according to Embodiment 7 of the present application comprises, in order from the object side to the image side, a first lens E1, a prism E2, a second lens E3, an aperture stop E50, a third lens E4, a fourth lens E5, a fifth lens E6, a sixth lens E7, a seventh lens E8, an eighth lens E9, a filter E30, and a photosensitive chip E40.

[0331] The first lens E1 has positive refractive power. The first lens E1 has a first object side surface E11 and a first image side surface E12, wherein the first object side surface E11 of the first lens E1 is at least partially curved towards the object side, has a convex surface shape, and the first image side surface E12 of the first lens E1 is a plane. A light ray incident along a height direction of the optical system 100 through the first object side surface E11 of the first lens E1 is converged by the first object side surface E11 of the first lens E1 and exits through the first image side surface E12 of the first lens E1.

[0332] The prism E2 has a first side surface E21, a second side surface E23, and a reflection surface E22, wherein the reflection surface E22 extends between the first side surface E21 and the second side surface E23. The first side surface E21, the reflection surface E22, and the second side surface E23 of the prism E2 are all planes. A light ray exiting from the first image side surface E12 of the first lens E1 enters the prism E2 from the first side surface E21 of the prism E2, is reflected by the reflection surface E22 of the prism E2, and then exits from the second side surface E23 of the prism E2.

[0333] The second lens E3 has negative refractive power. The second lens E3 has a second object side surface E31 and a second image side surface E32, wherein the second object side surface E31 of the second lens E3 is a plane, and the second image side surface E32 of the second lens E3 is at least partially curved towards the object side, has a concave surface shape. A light ray exiting from the second side surface E23 of the prism E2 enters the second lens E3 from the second object side surface E31 of the second lens E3, and exits from the second image side surface E32 of the second lens E3.

[0334] The third lens E4 has positive refractive power. The third lens E4 has a third object side E41 and a third image side E42, wherein the third object side E41 of the third lens E4 is at least partially curved towards the object side, has the face type of a convex surface, and the third image side E42 of the third lens E4 is at least partially curved towards the image side, has the face type of a convex surface. Rays exiting from the second image side E32 of the second lens E3 pass the stop E50, enter the third lens E4 from the third object side E41 of the third lens E4, and exit from the third image side E42 of the third lens E4.

[0335] The fourth lens E5 has negative refractive power. The fourth lens E5 has a fourth object side E51 and a fourth image side E52, wherein the fourth object side E51 of the fourth lens E5 is at least partially curved towards the object side, has the face type of a convex surface, and the fourth image side E52 of the fourth lens E5 is at least partially curved towards the object side, has the face type of a concave surface. Rays exiting from the third image side E42 of the third lens E4 enter the fourth lens E5 from the fourth object side E51 of the fourth lens E5, and exit from the fourth image side E52 of the fourth lens E5.

[0336] The fifth lens E6 has positive refractive power. The fifth lens E6 has a fifth object side E61 and a fifth image side E62, wherein the fifth object side E61 of the fifth lens E6 is at least partially curved towards the object side, has the face type of a convex surface, and the fifth image side E62 of the fifth lens E6 is at least partially curved towards the image side, has the face type of a convex surface. Rays exiting from the fourth image side E52 of the fourth lens E5 enter the fifth lens E6 from the fifth object side E61 of the fifth lens E6, and exit from the fifth image side E62 of the fifth lens E6.

[0337] The sixth lens E7 has negative refractive power. The sixth lens E7 has a sixth object side E71 and a sixth image side E72, wherein the sixth object side E71 of the sixth lens E7 is at least partially curved towards the image side, has the face type of a concave surface, and the sixth image side E72 of the sixth lens E7 is at least partially curved towards the image side, has the face type of a convex surface. Rays exiting from the fifth image side E62 of the fifth lens E6 enter the sixth lens E7 from the sixth object side E71 of the sixth lens E7, and exit from the sixth image side E72 of the sixth lens E7.

[0338] The seventh lens E8 has positive refractive power. The seventh lens E8 has a seventh object-side surface E81 and a seventh image-side surface E82, wherein the seventh object-side surface E81 of the seventh lens E8 is at least partially curved towards the image side, has a surface type of concave, the seventh image-side surface E82 of the seventh lens E8 is at least partially curved towards the image side, has a surface type of convex. The light rays exiting from the sixth image-side surface E72 of the sixth lens E7 enter the seventh lens E8 from the seventh object-side surface E81 of the seventh lens E8, and exit from the seventh image-side surface E82 of the seventh lens E8.

[0339] Table 15

[0340] The eighth lens E9 has negative refractive power. The eighth lens E9 has an eighth object-side surface E91 and an eighth image-side surface E92, wherein the eighth object-side surface E91 of the eighth lens E9 is at least partially curved towards the object side, has a surface type of convex, the eighth image-side surface E92 of the eighth lens E9 is at least partially curved towards the object side, has a surface type of concave. The light rays exiting from the seventh image-side surface E82 of the seventh lens E8 enter the eighth lens E9 from the eighth object-side surface E91 of the eighth lens E9, and exit from the eighth image-side surface E92 of the eighth lens E9.

[0341] The filter E30 has a filter object-side surface E301 and a filter image-side surface E302. The photosensitive chip E40 has a photosensitive surface E401. The light rays exiting from the eighth image-side surface E92 of the eighth lens E9 reach the photosensitive surface E401 of the photosensitive chip E40 after passing through the filter object-side surface E301 and the filter image-side surface E302 of the filter E30.

[0342] In embodiment 7, EFL = 22.5 mm; Fno = 2.17; FOV = 29.1 degrees, wherein EFL represents the effective focal length of the optical system 100, Fno represents the aperture value of the optical system 100, wherein Fno is the abbreviation of f-number, FOV represents the field of view angle of the optical system 100.

[0343] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 11.579; wherein D1 represents the effective diameter of the first lens E1; CT1 represents the center thickness of the first lens E1; D1 / CT1 represents the ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1.

[0344] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.8; wherein f1 represents the effective focal length of the first lens E1, EFL represents the effective focal length of the optical system 100; f1 / EFL represents the ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100.

[0345] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2 = 13.169; wherein D2 represents the effective diameter of the second lens E3; CT2 represents the center thickness of the second lens E3; D2 / CT2 represents the ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3.

[0346] The effective focal lengths of the first lens E1 and the second lens E3 satisfy the following condition: |f1 / f2| = 0.671; wherein f1 represents the effective focal length of the first lens E1; f2 represents the effective focal length of the second lens E3; f1 / f2 represents the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3; |f1 / f2| represents the absolute value of the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3.

[0347] The first lens E1, the prism E2 and the second lens E3 form a turning optical unit E10. The effective focal length of the turning optical unit E10 satisfies the following condition: f12 / EFL = 6.727; wherein f12 represents the effective focal length of the turning optical unit E10; f12 / EFL represents the ratio of the effective focal length of the turning optical unit E10 to the effective focal length of the optical system 100.

[0348] Table 15 shows the specific optical parameters of the various components of Example 7; Table 16 shows the aspherical coefficients of the various lenses of Example 7.

[0349] Table 16

[0350] In Embodiment 7, the optical system 100 satisfies the following conditions: SL / EFL = 1.495; wherein, SL represents the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100; EFL represents the effective focal length of the optical system 100; SL / EFL represents the ratio of the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 to the effective focal length of the optical system 100. SL / EPD = 3.243; SL represents the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; SL / EPD represents the ratio of the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 to the entrance pupil diameter of the optical system 100. GH / EPD = 0.882; wherein, GH represents the shoulder height of the lens group E20; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lens group E20 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV = 0.557; FOV represents the field of view angle of the optical system 100; tanFOV represents the tangent value of FOV, i.e., the tangent value of the field of view angle of the optical system 100. The optical system 100 satisfies the following condition: 16 cm ≤ OBJ < INF; wherein, OBJ represents the object distance at which the optical system 100 can realize imaging; INF represents infinity, i.e., the optical system 100 is capable of imaging under the condition that the object distance is greater than or equal to 16 cm.

[0351] Embodiment 8

[0352] The optical system 100 according to Embodiment 8 of the present application is described below with reference to FIGS. 36 to 40 of the accompanying drawings of the present application. FIG. 36 shows a structural schematic diagram of the optical system 100 according to Embodiment 8 of the present application.

[0353] As shown in FIGS. 36 to 37, the optical system 100 according to Embodiment 8 of the present application sequentially comprises, from the object side to the image side, a first lens E1, a prism E2, a second lens E3, an aperture stop E50, a third lens E4, a fourth lens E5, a fifth lens E6, a sixth lens E7, a seventh lens E8, an eighth lens E9, a filter E30, and a photosensitive chip E40.

[0354] The first lens E1 has positive refractive power. The first lens E1 has a first object side E11 and a first image side E12, wherein the first object side E11 of the first lens E1 is at least partially curved towards the object side, has a face type of a convex surface, and the first image side E12 of the first lens E1 is a plane. A light ray incident through the first object side E11 of the first lens E1 along a height direction set by the optical system 100 is converged by the first object side E11 of the first lens E1 and exits through the first image side E12 of the first lens E1.

[0355] The prism E2 has a first side E21, a second side E23 and a reflection surface E22, wherein the reflection surface E22 extends between the first side E21 and the second side E23. The first side E21, the reflection surface E22 and the second side E23 of the prism E2 are all planes. A light ray exiting from the first image side E12 of the first lens E1 enters the prism E2 from the first side E21 of the prism E2, is reflected by the reflection surface E22 of the prism E2 and exits from the second side E23 of the prism E2.

[0356] The second lens E3 has negative refractive power. The second lens E3 has a second object side E31 and a second image side E32, wherein the second object side E31 of the second lens E3 is a plane and the second image side E32 of the second lens E3 is at least partially curved towards the object side, has a face type of a concave surface. A light ray exiting from the second side E23 of the prism E2 enters the second lens E3 from the second object side E31 of the second lens E3 and exits from the second image side E32 of the second lens E3.

[0357] The third lens E4 has positive refractive power. The third lens E4 has a third object side E41 and a third image side E42, wherein the third object side E41 of the third lens E4 is at least partially curved towards the object side, has a face type of a convex surface, and the third image side E42 of the third lens E4 is at least partially curved towards the image side, has a face type of a convex surface. A light ray exiting from the second image side E32 of the second lens E3 passes through the diaphragm E50, enters the third lens E4 from the third object side E41 of the third lens E4 and exits from the third image side E42 of the third lens E4.

[0358] The fourth lens E5 has negative refractive power. The fourth lens E5 has a fourth object side E51 and a fourth image side E52, wherein the fourth object side E51 of the fourth lens E5 is at least partially curved toward the image side, has a surface shape of a concave surface, the fourth image side E52 of the fourth lens E5 is at least partially curved toward the object side, has a surface shape of a concave surface. The light rays exiting from the third image side E42 of the third lens E4 enter the fourth lens E5 from the fourth object side E51 of the fourth lens E5, and exit from the fourth image side E52 of the fourth lens E5.

[0359] The fifth lens E6 has positive refractive power. The fifth lens E6 has a fifth object side E61 and a fifth image side E62, wherein the fifth object side E61 of the fifth lens E6 is at least partially curved toward the object side, has a surface shape of a convex surface, the fifth image side E62 of the fifth lens E6 is at least partially curved toward the image side, has a surface shape of a convex surface. The light rays exiting from the fourth image side E52 of the fourth lens E5 enter the fifth lens E6 from the fifth object side E61 of the fifth lens E6, and exit from the fifth image side E62 of the fifth lens E6.

[0360] The sixth lens E7 has negative refractive power. The sixth lens E7 has a sixth object side E71 and a sixth image side E72, wherein the sixth object side E71 of the sixth lens E7 is at least partially curved toward the object side, has a surface shape of a convex surface, the sixth image side E72 of the sixth lens E7 is at least partially curved toward the object side, has a surface shape of a concave surface. The light rays exiting from the fifth image side E62 of the fifth lens E6 enter the sixth lens E7 from the sixth object side E71 of the sixth lens E7, and exit from the sixth image side E72 of the sixth lens E7.

[0361] The seventh lens E8 has positive refractive power. The seventh lens E8 has a seventh object side E81 and a seventh image side E82, wherein the seventh object side E81 of the seventh lens E8 is at least partially curved toward the image side, has a surface shape of a concave surface, the seventh image side E82 of the seventh lens E8 is at least partially curved toward the image side, has a surface shape of a convex surface. The light rays exiting from the sixth image side E72 of the sixth lens E7 enter the seventh lens E8 from the seventh object side E81 of the seventh lens E8, and exit from the seventh image side E82 of the seventh lens E8.

[0362] The eighth lens E9 has negative refractive power. The eighth lens E9 has an eighth object side E91 and an eighth image side E92, wherein the eighth object side E91 of the eighth lens E9 is curved at least in part towards the object side, has a convex surface shape, the eighth image side E92 of the eighth lens E9 is curved at least in part towards the object side, has a concave surface shape. Light rays exiting from the seventh image side E82 of the seventh lens E8 enter the eighth lens E9 from the eighth object side E91 of the eighth lens E9 and exit from the eighth image side E92 of the eighth lens E9.

[0363] The filter E30 has a filter object side E301 and a filter image side E302. The photosensitive chip E40 has a photosensitive surface E401. Light rays exiting from the eighth image side E92 of the eighth lens E9 reach the photosensitive surface E401 of the photosensitive chip E40 after passing the filter object side E301 and the filter image side E302 of the filter E30.

[0364] Table 17 shows specific optical parameters of various components of embodiment 8; Table 18 shows aspherical coefficients of various lenses of embodiment 8.

[0365] Table 17

[0366] In embodiment 8, EFL = 19.5 mm; Fno = 2.62; FOV = 24.9 degrees, wherein EFL denotes the effective focal length of the optical system 100, Fno denotes the aperture value of the optical system 100, wherein Fno is an abbreviation for f-number, FOV denotes the field of view angle of the optical system 100.

[0367] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 8.444; wherein D1 denotes the effective diameter of the first lens E1; CT1 denotes the center thickness of the first lens E1; D1 / CT1 denotes the ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1.

[0368] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 1.533; wherein f1 denotes the effective focal length of the first lens E1, EFL denotes the effective focal length of the optical system 100; f1 / EFL denotes the ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100.

[0369] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2=8.853; wherein D2 represents the effective diameter of the second lens E3; CT2 represents the center thickness of the second lens E3; D2 / CT2 represents the ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3.

[0370] The effective focal lengths of the first lens E1 and the second lens E3 satisfy the following condition: |f1 / f2|=0.627; wherein f1 represents the effective focal length of the first lens E1; f2 represents the effective focal length of the second lens E3; f1 / f2 represents the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3; |f1 / f2| represents the absolute value of the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3.

[0371] The first lens E1, the prism E2 and the second lens E3 form a turning optical unit E10. The effective focal length of the turning optical unit E10 satisfies the following condition: f12 / EFL=3.067; wherein f12 represents the effective focal length of the turning optical unit E10; f12 / EFL represents the ratio of the effective focal length of the turning optical unit E10 to the effective focal length of the optical system 100.

[0372] In Embodiment 8, the optical system 100 satisfies the following conditions: SL / EFL = 1.267; wherein, SL represents the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100; EFL represents the effective focal length of the optical system 100; SL / EFL represents the ratio of the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 to the effective focal length of the optical system 100. SL / EPD = 3.315; SL represents the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; SL / EPD represents the ratio of the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 to the entrance pupil diameter of the optical system 100. GH / EPD = 0.799; wherein, GH represents the shoulder height of the lens group E20; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lens group E20 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV = 0.464; FOV represents the field of view angle of the optical system 100; tanFOV represents the tangent value of FOV, i.e., the tangent value of the field of view angle of the optical system 100. The optical system 100 satisfies the following condition: 16cm≤OBJ<INF; wherein, OBJ represents the object distance at which the optical system 100 can realize imaging; INF represents infinity, i.e., the optical system 100 can image under the condition that the object distance is greater than or equal to 16cm.

[0373] Table 18

[0374] Embodiment 9

[0375] The optical system 100 according to Embodiment 9 of the present application is described below with reference to FIGS. 41 to 45 of the drawings accompanying the present specification. FIG. 41 shows a structural schematic diagram of the optical system 100 according to Embodiment 9 of the present application.

[0376] As shown in FIGS. 41 and 42, the optical system 100 according to Embodiment 9 of the present application sequentially comprises, from the object side to the image side, a first lens E1, a prism E2, a second lens E3, an aperture stop E50, a third lens E4, a fourth lens E5, a fifth lens E6, a sixth lens E7, a seventh lens E8, an eighth lens E9, a filter E30, and a photosensitive chip E40.

[0377] The first lens E1 has positive refractive power. The first lens E1 has a first object side E11 and a first image side E12, wherein the first object side E11 of the first lens E1 is at least partially curved towards the object side, has a face type of a convex surface, and the first image side E12 of the first lens E1 is a plane. A light ray incident through the first object side E11 of the first lens E1 along a height direction set by the optical system 100 is converged by the first object side E11 of the first lens E1 and exits through the first image side E12 of the first lens E1.

[0378] The prism E2 has a first side E21, a second side E23 and a reflection surface E22, wherein the reflection surface E22 extends between the first side E21 and the second side E23. The first side E21, the reflection surface E22 and the second side E23 of the prism E2 are all planes. A light ray exiting from the first image side E12 of the first lens E1 enters the prism E2 from the first side E21 of the prism E2, is reflected by the reflection surface E22 of the prism E2 and exits from the second side E23 of the prism E2.

[0379] The second lens E3 has negative refractive power. The second lens E3 has a second object side E31 and a second image side E32, wherein the second object side E31 of the second lens E3 is a plane and the second image side E32 of the second lens E3 is at least partially curved towards the object side, has a face type of a concave surface. A light ray exiting from the second side E23 of the prism E2 enters the second lens E3 from the second object side E31 of the second lens E3 and exits from the second image side E32 of the second lens E3.

[0380] The third lens E4 has positive refractive power. The third lens E4 has a third object side E41 and a third image side E42, wherein the third object side E41 of the third lens E4 is at least partially curved towards the object side, has a face type of a convex surface, and the third image side E42 of the third lens E4 is at least partially curved towards the image side, has a face type of a convex surface. A light ray exiting from the second image side E32 of the second lens E3 passes through the diaphragm E50, enters the third lens E4 from the third object side E41 of the third lens E4 and exits from the third image side E42 of the third lens E4.

[0381] The fourth lens E5 has negative refractive power. The fourth lens E5 has a fourth object side E51 and a fourth image side E52, wherein the fourth object side E51 of the fourth lens E5 is at least partially curved toward the object side, has a convex face type, and the fourth image side E52 of the fourth lens E5 is at least partially curved toward the object side, has a concave face type. The light rays exiting from the third image side E42 of the third lens E4 enter the fourth lens E5 from the fourth object side E51 of the fourth lens E5, and exit from the fourth image side E52 of the fourth lens E5.

[0382] The fifth lens E6 has positive refractive power. The fifth lens E6 has a fifth object side E61 and a fifth image side E62, wherein the fifth object side E61 of the fifth lens E6 is at least partially curved toward the object side, has a convex face type, and the fifth image side E62 of the fifth lens E6 is at least partially curved toward the image side, has a convex face type. The light rays exiting from the fourth image side E52 of the fourth lens E5 enter the fifth lens E6 from the fifth object side E61 of the fifth lens E6, and exit from the fifth image side E62 of the fifth lens E6.

[0383] The sixth lens E7 has negative refractive power. The sixth lens E7 has a sixth object side E71 and a sixth image side E72, wherein the sixth object side E71 of the sixth lens E7 is at least partially curved toward the image side, has a concave face type, and the sixth image side E72 of the sixth lens E7 is at least partially curved toward the image side, has a convex face type. The light rays exiting from the fifth image side E62 of the fifth lens E6 enter the sixth lens E7 from the sixth object side E71 of the sixth lens E7, and exit from the sixth image side E72 of the sixth lens E7.

[0384] The seventh lens E8 has positive refractive power. The seventh lens E8 has a seventh object side E81 and a seventh image side E82, wherein the seventh object side E81 of the seventh lens E8 is at least partially curved toward the object side, has a convex face type, and the seventh image side E82 of the seventh lens E8 is at least partially curved toward the image side, has a convex face type. The light rays exiting from the sixth image side E72 of the sixth lens E7 enter the seventh lens E8 from the seventh object side E81 of the seventh lens E8, and exit from the seventh image side E82 of the seventh lens E8.

[0385] The eighth lens E9 has negative refractive power. The eighth lens E9 has an eighth object side E91 and an eighth image side E92, wherein the eighth object side E91 of the eighth lens E9 is at least partially curved towards the object side, has a convex surface shape, and the eighth image side E92 of the eighth lens E9 is at least partially curved towards the object side, has a concave surface shape. Rays exiting from the seventh image side E82 of the seventh lens E8 enter the eighth lens E9 from the eighth object side E91 of the eighth lens E9 and exit from the eighth image side E92 of the eighth lens E9.

[0386] The filter E30 has a filter object side E301 and a filter image side E302. The photosensitive chip E40 has a photosensitive surface E401. Rays exiting from the seventh image side E82 of the seventh lens E8 reach the photosensitive surface E401 of the photosensitive chip E40 after passing through the filter object side E301 and the filter image side E302 of the filter E30.

[0387] In embodiment 9, EFL = 27.2 mm; Fno = 2.15; FOV = 21.9 degrees, wherein EFL represents the effective focal length of the optical system 100, Fno represents the aperture value of the optical system 100, wherein Fno is an abbreviation of f-number, and FOV represents the field of view angle of the optical system 100.

[0388] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 12.475; wherein D1 represents the effective diameter of the first lens E1; CT1 represents the center thickness of the first lens E1; and D1 / CT1 represents the ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1.

[0389] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.288; wherein f1 represents the effective focal length of the first lens E1, and EFL represents the effective focal length of the optical system 100; and f1 / EFL represents the ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100.

[0390] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2 = 13.933; wherein D2 represents the effective diameter of the second lens E3; CT2 represents the center thickness of the second lens E3; and D2 / CT2 represents the ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3.

[0391] The effective focal length of the first lens E1 and the second lens E3 satisfy the following condition: |f1 / f2|=0.603; wherein f1 represents the effective focal length of the first lens E1; f2 represents the effective focal length of the second lens E3; f1 / f2 represents the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3; |f1 / f2| represents the absolute value of the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3. The first lens E1, the prism E2 and the second lens E3 form a folded optical unit E10. The effective focal length of the folded optical unit E10 satisfy the following condition: f12 / EFL=4.699; wherein f12 represents the effective focal length of the folded optical unit E10; f12 / EFL represents the ratio of the effective focal length of the folded optical unit E10 to the effective focal length of the optical system 100.

[0392] Table 19

[0393] Table 19 shows the specific optical parameters of the various components of Example 9; Table 20 shows the aspherical coefficients of the various lenses of Example 9.

[0394] In embodiment 9, the optical system 100 satisfies the following conditions: SL / EFL = 1.470; wherein, SL represents the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100; EFL represents the effective focal length of the optical system 100; SL / EFL represents the ratio of the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 to the effective focal length of the optical system 100. SL / EPD = 3.160; wherein, SL represents the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; SL / EPD represents the ratio of the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 to the entrance pupil diameter of the optical system 100. GH / EPD = 0.868; wherein, GH represents the shoulder height of the lens group E20; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lens group E20 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following conditions: tanFOV = 0.403; FOV represents the field of view angle of the optical system 100; tanFOV represents the tangent value of FOV, i.e., the tangent value of the field of view angle of the optical system 100. The optical system 100 satisfies the following conditions: 16cm ≤ OBJ < INF; wherein, OBJ represents the object distance that can be imaged by the optical system 100; INF represents infinity, i.e., the optical system 100 can image under the condition that the object distance is greater than or equal to 16cm.

[0395] Table 20

[0396] Embodiment 10

[0397] The optical system 100 according to embodiment 10 of the present application is described below with reference to the accompanying drawings of the present application, FIG. 46 to FIG. 50. FIG. 46 shows a structural schematic diagram of the optical system 100 according to embodiment 10 of the present application.

[0398] As shown in FIG. 46 and FIG. 47, the optical system 100 according to embodiment 9 of the present application sequentially comprises, from the object side to the image side, a first lens E1, a prism E2, a second lens E3, an aperture stop E50, a third lens E4, a fourth lens E5, a fifth lens E6, a sixth lens E7, a seventh lens E8, an eighth lens E9, a filter E30, and a photosensitive chip E40.

[0399] The first lens E1 has positive refractive power. The first lens E1 has a first object side E11 and a first image side E12, wherein the first object side E11 of the first lens E1 is at least partially curved towards the object side, has a face type of a convex surface, and the first image side E12 of the first lens E1 is a plane. A light ray incident through the first object side E11 of the first lens E1 along a height direction set by the optical system 100 is converged by the first object side E11 of the first lens E1 and exits through the first image side E12 of the first lens E1.

[0400] The prism E2 has a first side E21, a second side E23 and a reflection surface E22, wherein the reflection surface E22 extends between the first side E21 and the second side E23. The first side E21, the reflection surface E22 and the second side E23 of the prism E2 are all planes. A light ray exiting from the first image side E12 of the first lens E1 enters the prism E2 from the first side E21 of the prism E2, is reflected by the reflection surface E22 of the prism E2 and exits from the second side E23 of the prism E2.

[0401] The second lens E3 has negative refractive power. The second lens E3 has a second object side E31 and a second image side E32, wherein the second object side E31 of the second lens E3 is a plane and the second image side E32 of the second lens E3 is at least partially curved towards the object side, has a face type of a concave surface. A light ray exiting from the second side E23 of the prism E2 enters the second lens E3 from the second object side E31 of the second lens E3 and exits from the second image side E32 of the second lens E3.

[0402] The third lens E4 has positive refractive power. The third lens E4 has a third object side E41 and a third image side E42, wherein the third object side E41 of the third lens E4 is at least partially curved towards the object side, has a face type of a convex surface, and the third image side E42 of the third lens E4 is at least partially curved towards the image side, has a face type of a convex surface. A light ray exiting from the second image side E32 of the second lens E3 passes through the diaphragm E50, enters the third lens E4 from the third object side E41 of the third lens E4 and exits from the third image side E42 of the third lens E4.

[0403] The fourth lens E5 has negative refractive power. The fourth lens E5 has a fourth object side E51 and a fourth image side E52, wherein the fourth object side E51 of the fourth lens E5 is at least partially curved toward the object side, has a convex face type, and the fourth image side E52 of the fourth lens E5 is at least partially curved toward the object side, has a concave face type. The light rays exiting from the third image side E42 of the third lens E4 enter the fourth lens E5 from the fourth object side E51 of the fourth lens E5, and exit from the fourth image side E52 of the fourth lens E5.

[0404] The fifth lens E6 has positive refractive power. The fifth lens E6 has a fifth object side E61 and a fifth image side E62, wherein the fifth object side E61 of the fifth lens E6 is at least partially curved toward the object side, has a convex face type, and the fifth image side E62 of the fifth lens E6 is at least partially curved toward the image side, has a convex face type. The light rays exiting from the fourth image side E52 of the fourth lens E5 enter the fifth lens E6 from the fifth object side E61 of the fifth lens E6, and exit from the fifth image side E62 of the fifth lens E6.

[0405] The sixth lens E7 has negative refractive power. The sixth lens E7 has a sixth object side E71 and a sixth image side E72, wherein the sixth object side E71 of the sixth lens E7 is at least partially curved toward the image side, has a concave face type, and the sixth image side E72 of the sixth lens E7 is at least partially curved toward the image side, has a convex face type. The light rays exiting from the fifth image side E62 of the fifth lens E6 enter the sixth lens E7 from the sixth object side E71 of the sixth lens E7, and exit from the sixth image side E72 of the sixth lens E7.

[0406] The seventh lens E8 has positive refractive power. The seventh lens E8 has a seventh object side E81 and a seventh image side E82, wherein the seventh object side E81 of the seventh lens E8 is at least partially curved toward the image side, has a concave face type, and the seventh image side E82 of the seventh lens E8 is at least partially curved toward the image side, has a convex face type. The light rays exiting from the sixth image side E72 of the sixth lens E7 enter the seventh lens E8 from the seventh object side E81 of the seventh lens E8, and exit from the seventh image side E82 of the seventh lens E8.

[0407] Table 21

[0408] The eighth lens E9 has negative refractive power. The eighth lens E9 has an eighth object side E91 and an eighth image side E92, wherein the eighth object side E91 of the eighth lens E9 is curved at least in part towards the object side, has a convex surface shape, the eighth image side E92 of the eighth lens E9 is curved at least in part towards the object side, has a concave surface shape. Rays exiting from the seventh image side E82 of the seventh lens E8 enter the eighth lens E9 from the eighth object side E91 of the eighth lens E9 and exit from the eighth image side E92 of the eighth lens E9.

[0409] The filter E30 has a filter object side E301 and a filter image side E302. The photosensitive chip E40 has a photosensitive surface E401. Rays exiting from the seventh image side E82 of the seventh lens E8 reach the photosensitive surface E401 of the photosensitive chip E40 after passing the filter object side E301 and the filter image side E302 of the filter E30.

[0410] Table 21 shows specific optical parameters of various components of embodiment 10; Table 22 shows aspherical coefficients of various lenses of embodiment 10.

[0411] In embodiment 10, EFL = 20.1 mm; Fno = 2.25; FOV = 29.1 degrees, wherein EFL denotes the effective focal length of the optical system 100, Fno denotes the aperture value of the optical system 100, wherein Fno is an abbreviation for f-number, FOV denotes the field of view angle of the optical system 100.

[0412] Table 22

[0413] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 10.351; wherein D1 denotes the effective diameter of the first lens E1; CT1 denotes the center thickness of the first lens E1; D1 / CT1 denotes the ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1.

[0414] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.569; wherein f1 denotes the effective focal length of the first lens E1, EFL denotes the effective focal length of the optical system 100; f1 / EFL denotes the ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100.

[0415] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2=13.123; wherein D2 represents the effective diameter of the second lens E3; CT2 represents the center thickness of the second lens E3; D2 / CT2 represents the ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3.

[0416] The effective focal lengths of the first lens E1 and the second lens E3 satisfy the following condition: |f1 / f2|=0.668; wherein f1 represents the effective focal length of the first lens E1; f2 represents the effective focal length of the second lens E3; f1 / f2 represents the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3; |f1 / f2| represents the absolute value of the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3. The first lens E1, the prism E2 and the second lens E3 form a turning optical unit E10.

[0417] The effective focal length of the turning optical unit E10 satisfies the following condition: f12 / EFL=6.057; wherein f12 represents the effective focal length of the turning optical unit E10; f12 / EFL represents the ratio of the effective focal length of the turning optical unit E10 to the effective focal length of the optical system 100.

[0418] In embodiment 10, the optical system 100 satisfies the following conditions: SL / EFL = 1.459; wherein, SL represents the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100; EFL represents the effective focal length of the optical system 100; SL / EFL represents the ratio of the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 to the effective focal length of the optical system 100. SL / EPD = 3.283; wherein, SL represents the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; SL / EPD represents the ratio of the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 to the entrance pupil diameter of the optical system 100. GH / EPD = 0.872; wherein, GH represents the shoulder height of the lens group E20; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lens group E20 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV = 0.556; FOV represents the field of view angle of the optical system 100; tanFOV represents the tangent value of FOV, i.e., the tangent value of the field of view angle of the optical system 100. The optical system 100 satisfies the following condition: 16cm ≤ OBJ < INF; wherein, OBJ represents the object distance that can be imaged by the optical system 100; INF represents infinity, i.e., the optical system 100 is capable of imaging under the condition that the object distance is greater than or equal to 16cm.

[0419] In summary, the optical system 100 according to the embodiments of the present application is illustrated. The optical system 100 adopts a specific optical design, which can realize a large aperture, reduce the shoulder height of the lens group, and ensure the anti-shake performance of the periscope camera module.

[0420] It should be understood by those skilled in the art that the embodiments of the present application described above and shown in the drawings are only examples and do not limit the present application. The purpose of the present application has been fully and effectively achieved. The function and structural principle of the present application have been shown and described in the embodiments, and the embodiments of the present application can be modified or changed in any way without departing from the principles.

Claims

1. An optical system characterized by comprising: In order from the object side to the image side, comprising: a first lens having positive refractive power for converging light rays; a prism for turning the light rays; a second lens having negative refractive power for diverging the light rays; a lens group comprising a plurality of lenses arranged in order; and wherein the lens group and the optical system satisfy the following conditions: 0.38 < GH / EPD < 1.00; wherein GH represents the shoulder height of the lens group; EPD represents the entrance pupil diameter of the optical system; GH / EPD represents the ratio of the shoulder height of the lens group to the entrance pupil diameter of the optical system.

2. The optical system of claim 1, wherein, the first lens satisfies the following condition: 3.0 < D1 / CT1 < 12.5; wherein D1 represents the effective diameter of the first lens; CT1 represents the center thickness of the first lens; D1 / CT1 represents the ratio of the effective diameter of the first lens to the center thickness of the first lens.

3. The optical system of claim 1, wherein, the second lens satisfies the following condition: 2.2 < D2 / CT2 < 14.0; wherein D2 represents the effective diameter of the second lens; CT2 represents the center thickness of the second lens; D2 / CT2 represents the ratio of the effective diameter of the second lens to the center thickness of the second lens.

4. The optical system of claim 1, wherein, the first lens satisfies the following condition: 3.2 > f1 / EFL > 1.5; wherein f1 represents the effective focal length of the first lens, EFL represents the effective focal length of the optical system; f1 / EFL represents the ratio of the effective focal length of the first lens to the effective focal length of the optical system.

5. The optical system of claim 1, wherein, the first lens, the prism and the second lens form a turning optical unit, the turning optical unit satisfies the following condition: -13.5 < f12 / EFL < 6.8; wherein f12 represents the effective focal length of the turning optical unit; EFL represents the effective focal length of the optical system; f12 / EFL represents the ratio of the effective focal length of the turning optical unit to the effective focal length of the optical system.

6. The optical system of claim 1, wherein, the optical system satisfies the following condition: tanFOV < 0.65; wherein FOV represents the field of view angle of the optical system; tanFOV represents the tangent value of the field of view angle of the optical system.

7. The optical system of claim 1, wherein, the optical system further comprises a photosensitive chip, the first lens, the prism, the second lens and the lens group are on the photosensitive path of the photosensitive chip, and the optical system satisfies the following condition: SL / EFL < 1.7; wherein SL represents the total length of the optical system in the extension direction of the main optical axis set by the optical system; EFL represents the effective focal length of the optical system; SL / EFL represents the ratio of the total length of the optical system in the extension direction of the main optical axis set by the optical system to the effective focal length of the optical system.

8. The optical system of claim 1, wherein, the optical system further comprises a photosensitive chip, the first lens, the prism, the second lens and the lens group are on the photosensitive path of the photosensitive chip, and the optical system satisfies the following condition: 3.1 < SL / EPD < 5.4; Wherein, SL represents the total length of the optical system in the extension direction of the set principal axis thereof; EPD represents the entrance pupil diameter of the optical system; SL / EPD represents the ratio of the total length of the optical system in the extension direction of the set principal axis thereof to the entrance pupil diameter of the optical system.

9. The optical system of claim 1, wherein, The first lens and the second lens satisfy the following condition: 0.6<|f1 / f2|<1.7 Wherein, f1 represents the effective focal length of the first lens; f2 represents the effective focal length of the second lens; f1 / f2 represents the ratio of the effective focal length of the first lens to the effective focal length of the second lens; |f1 / f2| represents the absolute value of the ratio of the effective focal length of the first lens to the effective focal length of the second lens.

10. The optical system of claim 1, wherein, The optical system further comprises a photosensitive chip, the first lens, the prism, the second lens, and the lens group are on the photosensitive path of the photosensitive chip, and the optical system satisfies the following object distance requirement: 12cm≤OBJ<INF. Wherein, OBJ represents the object distance that the optical system can achieve imaging; and INF represents infinity.

11. The optical system of claim 1, wherein, The first lens has a first object side and a first image side, and the first object side has a convex surface shape.

12. The optical system of claim 1, wherein, The second lens has a second object side and a second image side, and the second object side has a concave surface shape.

13. A periscope camera module, comprising: Comprise: a housing; and The optical system as claimed in any one of claims 1 to 12 is installed in the housing. ​

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