Optical system and periscope camera module

Abstract

The present application discloses an optical system and a periscope camera module. The optical system adopts a specific optical design, which achieves a large aperture, reduces shoulder height, and ensures the optical image stabilization performance of a periscopic camera module, and also reduces the weight of a light convergence unit. Specifically, the optical system comprises a first lens, a planar reflector, a second lens, and a lower lens group in sequence from an object side to an image side; the first lens has a positive focal power and is used for converging light; the planar reflector is used for reflecting light; and the second lens has a negative focal power and is used for expanding light. The first lens and the second lens satisfy the following conditions: 0.70 < |f1 / f2| < 1.2, where f1 represents an effective focal length of the first lens, f2 represents an 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, and |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.

Description

Optical system and periscopic camera module TECHNICAL FIELD

[0001] The present application relates to the field of camera modules, 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 problem 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 a plane mirror to deflect the light path, which 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 not only realizes a large aperture, reduces the shoulder height of the lower group lens set, and ensures the optical anti-shake performance of the periscopic camera module, but also reduces the weight of the light collecting unit and the driving burden.

[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 optical path design, the type of optical element and the control of optical parameters, 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, in order from the object side to the image side:

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

[0008] a plane mirror for reflecting the light rays;

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

[0010] a lower group lens set comprising a plurality of lenses arranged in order.

[0011] wherein the first lens and the second lens satisfy the following condition:

[0012] 0.86<|f1 / f2|<1.2;

[0013] 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.

[0014] In an embodiment of the optical system according to the present application, the first lens satisfies the following condition: 9.8

[0015] In an embodiment of the optical system according to the present application, the second lens satisfies the following condition: 7.1

[0016] In an embodiment of the optical system according to the present application, the first lens satisfies the following condition: 2.2

[0017] In an embodiment of the optical system according to the present application, the first lens, the plane mirror and the second lens form a light collecting unit, and the light collecting unit satisfies the following condition: 9

[0018] In an embodiment of the optical system according to the present application, the optical system satisfies the following condition: 0.45

[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 plane mirror, the second lens and the lower group lens set are on a photosensitive path of the photosensitive chip, and the optical system satisfies the following condition: 1.4 < SL / EFL < 1.5; 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 plane mirror, the second lens and the lower group lens set are on a photosensitive path of the photosensitive chip, and the optical system satisfies the following condition: 2.8 < SL / EPD < 3.6; 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 optical system satisfies the following condition: 0.33 < GH / EPD < 0.4; wherein, GH represents a shoulder height of the lower group lens set; EPD represents an entrance pupil diameter of the optical system; and GH / EPD represents a ratio of the shoulder height of the lower group lens set to the entrance pupil diameter of the optical system.

[0022] In an embodiment of the optical system according to the present application, 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 optical system further comprises a photosensitive chip, the photosensitive chip has a photosensitive surface, the first lens, the plane mirror, the second lens and the lower group lens set are on a photosensitive path of the photosensitive chip, and the optical system satisfies the following condition: 0.35 < Fno / ImgH < 0.42; wherein, Fno represents an aperture of the optical system; ImgH represents a half image height of the optical system; and Fno / ImgH represents a ratio of the aperture of the optical system to the half image height of the optical system.

[0024] In an embodiment of the optical system according to the present application, the optical system satisfies the following condition: 0.8 < SH / EPD < 1.1; wherein SH represents the total height of the optical system; EPD represents the entrance pupil diameter of the optical system; SH / EPD represents the ratio of the total height of the optical system to the entrance pupil diameter of the optical system.

[0025] 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, wherein the first object side surface has a convex surface shape, and the first image side surface has a convex surface shape.

[0026] In an embodiment of the optical system according to the present application, the second lens has a second object side surface and a second image side surface, wherein the second object side surface has a concave surface shape, and the second image side surface has a concave surface shape.

[0027] In an embodiment of the optical system according to the present application, the optical system further comprises a filter, which is located on the image side of the lower group lens set.

[0028] According to another aspect of the present application, there is provided an optical system comprising, in order from the object side to the image side:

[0029] a first lens having a positive focal power for converging light rays;

[0030] a planar mirror for reflecting the light rays;

[0031] a second lens having a negative focal power for diverging the light rays; and

[0032] a lower group lens set comprising a plurality of lenses arranged in order;

[0033] wherein the first lens and the second lens satisfy the following condition:

[0034] 0.70 < |f1 / f2| < 1.2;

[0035] 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.

[0036] In an embodiment of the optical system according to the present application, the first lens satisfies the following condition: 8.8 < D1 / CT1 < 17.8; 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.

[0037] In an embodiment of the optical system according to the present application, the second lens satisfies the following condition: 7.1 < D2 / CT2 < 12.4; 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.

[0038] In an embodiment of the optical system according to the present application, the first lens satisfies the following condition: 2.1 < f1 / EFL; 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.

[0039] In an embodiment of the optical system according to the present application, the first lens, the plane mirror and the second lens form a light collecting unit, the light collecting unit satisfies the following condition: 5.7 < f12 / EFL < 23.7; wherein f12 represents an effective focal length of the light collecting unit; EFL represents an effective focal length of the optical system; f12 / EFL represents a ratio of the effective focal length of the light collecting unit to the effective focal length of the optical system.

[0040] In an embodiment of the optical system according to the present application, the optical system satisfies the following condition: tanFOV < 0.70; 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.

[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 plane mirror, the second lens and the lower group lens group are on a photosensitive path of the photosensitive chip, the optical system satisfies the following condition: SL / EFL < 1.51; wherein SL represents a total length of the optical system in an extension direction of a main optical axis set by the optical system; 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 set by the optical system to the effective focal length of the optical system.

[0042] In an embodiment of the optical system according to the present application, the optical system further comprises a photosensitive chip, the first lens, the plane mirror, the second lens, and the lower group lens set are on a photosensitive path of the photosensitive chip, and the optical system satisfies the following condition: 2.8 < SL / EPD < 3.6; 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.

[0043] In an embodiment of the optical system according to the present application, the optical system satisfies the following condition: 0.33 < GH / EPD < 1.5; wherein GH represents a shoulder height of the lower group lens set; EPD represents an entrance pupil diameter of the optical system; and GH / EPD represents a ratio of the shoulder height of the lower group lens set to the entrance pupil diameter of the optical system.

[0044] In an embodiment of the optical system according to the present application, 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.

[0045] In an embodiment of the optical system according to the present application, the optical system further comprises a photosensitive chip, the photosensitive chip has a photosensitive surface, the first lens, the plane mirror, the second lens, and the lower group lens set are on a photosensitive path of the photosensitive chip, and the optical system satisfies the following condition: 0.33 < Fno / ImgH; wherein Fno represents an aperture of the optical system; ImgH represents a half image height of the optical system; and Fno / ImgH represents a ratio of the aperture of the optical system to the half image height of the optical system.

[0046] In an embodiment of the optical system according to the present application, the optical system satisfies the following condition: 0.8 < SH / EPD < 1.1; wherein SH represents a total height of the optical system; EPD represents an entrance pupil diameter of the optical system; and SH / EPD represents a ratio of the total height of the optical system to the entrance pupil diameter of the optical system.

[0047] According to yet another aspect of the present application, there is also provided a periscopic camera module, comprising:

[0048] a housing; and

[0049] an optical system as described above, the optical system being mounted in the housing.

[0050] These and other objects, features, and advantages of the present application will become apparent with reference to the following description and accompanying drawings.

[0051] These and other objects, features, and advantages of the present application will become apparent with reference to the following description and accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0052] 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:

[0053] 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:

[0054] FIG. 1 illustrates a structural schematic view of an optical system according to Embodiment 1 of the present application.

[0055] FIG. 2 illustrates another structural schematic view of the optical system according to Embodiment 1 of the present application.

[0056] FIG. 3 illustrates a distortion curve schematic view of the optical system according to Embodiment 1 of the present application.

[0057] FIG. 4 illustrates a chromatic aberration curve schematic view of the optical system according to Embodiment 1 of the present application.

[0058] FIG. 5 illustrates a curvature of field curve schematic view of the optical system according to Embodiment 1 of the present application.

[0059] FIG. 6 illustrates a structural schematic view of an optical system according to Embodiment 2 of the present application.

[0060] FIG. 7 illustrates another structural schematic view of the optical system according to Embodiment 2 of the present application.

[0061] FIG. 8 illustrates a distortion curve schematic view of the optical system according to Embodiment 2 of the present application.

[0062] FIG. 9 illustrates a chromatic aberration curve schematic view of the optical system according to Embodiment 2 of the present application.

[0063] FIG. 10 illustrates a curvature of field curve schematic view of the optical system according to Embodiment 2 of the present application.

[0064] FIG. 11 illustrates a structural schematic diagram of an optical system according to Embodiment 3 of the present application.

[0065] FIG. 12 illustrates another structural schematic diagram of an optical system according to Embodiment 3 of the present application.

[0066] FIG. 13 illustrates a distortion curve schematic diagram of an optical system according to Embodiment 3 of the present application.

[0067] FIG. 14 illustrates a chromatic aberration curve schematic diagram of an optical system according to Embodiment 3 of the present application.

[0068] FIG. 15 illustrates a curve schematic diagram of astigmatism of an optical system according to Embodiment 3 of the present application.

[0069] FIG. 16 illustrates a structural schematic diagram of an optical system according to Embodiment 4 of the present application.

[0070] FIG. 17 illustrates another structural schematic diagram of an optical system according to Embodiment 4 of the present application.

[0071] FIG. 18 illustrates a distortion curve schematic diagram of an optical system according to Embodiment 4 of the present application.

[0072] FIG. 19 illustrates a chromatic aberration curve schematic diagram of an optical system according to Embodiment 4 of the present application.

[0073] FIG. 20 illustrates a curve schematic diagram of astigmatism of an optical system according to Embodiment 4 of the present application.

[0074] FIG. 21 illustrates a structural schematic diagram of an optical system according to Embodiment 5 of the present application.

[0075] FIG. 22 illustrates another structural schematic diagram of an optical system according to Embodiment 5 of the present application.

[0076] FIG. 23 illustrates a distortion curve schematic diagram of an optical system according to Embodiment 5 of the present application.

[0077] FIG. 24 illustrates a chromatic aberration curve schematic diagram of an optical system according to Embodiment 5 of the present application.

[0078] FIG. 25 illustrates a curve schematic diagram of astigmatism of an optical system according to Embodiment 5 of the present application.

[0079] FIG. 26 illustrates a structural schematic diagram of an optical system according to Embodiment 6 of the present application.

[0080] FIG. 27 illustrates another structural schematic diagram of an optical system according to Embodiment 6 of the present application.

[0081] FIG. 28 illustrates a distortion curve schematic diagram of an optical system according to Embodiment 6 of the present application.

[0082] FIG. 29 illustrates a chromatic aberration curve diagram of the optical system according to Embodiment 6 of the present application.

[0083] FIG. 30 illustrates a curvature of field curve diagram of the optical system according to Embodiment 6 of the present application.

[0084] FIG. 31 illustrates a structure diagram of the optical system according to Embodiment 7 of the present application.

[0085] FIG. 32 illustrates another structure diagram of the optical system according to Embodiment 7 of the present application.

[0086] FIG. 33 illustrates a distortion curve diagram of the optical system according to Embodiment 7 of the present application.

[0087] FIG. 34 illustrates a chromatic aberration curve diagram of the optical system according to Embodiment 7 of the present application.

[0088] FIG. 35 illustrates a curvature of field curve diagram of the optical system according to Embodiment 7 of the present application.

[0089] FIG. 36 illustrates a structure diagram of the optical system according to Embodiment 8 of the present application.

[0090] FIG. 37 illustrates another structure diagram of the optical system according to Embodiment 8 of the present application.

[0091] FIG. 38 illustrates a distortion curve diagram of the optical system according to Embodiment 8 of the present application.

[0092] FIG. 39 illustrates a chromatic aberration curve diagram of the optical system according to Embodiment 8 of the present application.

[0093] FIG. 40 illustrates a curvature of field curve diagram of the optical system according to Embodiment 8 of the present application.

[0094] FIG. 41 illustrates a structure diagram of the optical system according to Embodiment 9 of the present application.

[0095] FIG. 42 illustrates another structure diagram of the optical system according to Embodiment 9 of the present application.

[0096] FIG. 43 illustrates a distortion curve diagram of the optical system according to Embodiment 9 of the present application.

[0097] FIG. 44 illustrates a chromatic aberration curve diagram of the optical system according to Embodiment 9 of the present application.

[0098] FIG. 45 illustrates a curvature of field curve diagram of the optical system according to Embodiment 9 of the present application.

[0099] FIG. 46 illustrates a structure diagram of the optical system according to Embodiment 10 of the present application.

[0100] FIG. 47 illustrates another structural schematic diagram of an optical system according to Embodiment 10 of the present application.

[0101] FIG. 48 illustrates a distortion curve schematic diagram of an optical system according to Embodiment 10 of the present application.

[0102] FIG. 49 illustrates a chromatic aberration curve schematic diagram of an optical system according to Embodiment 10 of the present application.

[0103] FIG. 50 illustrates an astigmatism curve schematic diagram of an optical system according to Embodiment 10 of the present application.

[0104] FIG. 51 illustrates a partial light path schematic diagram of an optical system according to an embodiment of the present application. DETAILED DESCRIPTION

[0105] 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. Therefore, the attached drawings should not be used to limit and define the present application, and the present application should cover all changes falling within the scope of the appended claims and their equivalents.

[0106] SUMMARY

[0107] The periscopic camera module mainly realizes long focal length shooting through the scheme of turning the light path. The periscopic camera module increases the effective focal length through the bending of the light path, and the height size is similar to that of the straight-line module, so it can meet the size requirements of the terminal device.

[0108] Specifically, a common 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 turned light reaches the photosensitive chip after passing through the lens assembly and the color filter, and then 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.

[0109] Therefore, the periscopic camera module can change the long lens structure by changing the angle of the incident light, reduce the height of the module, and to a great extent, realize the requirements of miniaturization of the terminal device and optical zoom. 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.

[0110] The current periscopic camera module still cannot well meet the requirements of the market. It can be understood that in the optical system of the periscopic camera module, the aperture will directly affect the night scene, snapshot, background blur, video and other functions of the periscopic camera module, and when a large aperture (smaller aperture F value) lens is used for shooting, the blurred background of the photo can be increased and the main body can be highlighted, the shutter speed and focusing speed can be improved, and better imaging quality can be obtained.

[0111] However, the demand for large aperture of the periscopic camera module contradicts the development trend and driving force demand of the miniaturization and thinness of the terminal device. Among them, due to the size limitation of the prism's light entrance surface and light exit surface, the area of the prism receiving light is limited, which in turn leads to less light entering the lens and smaller effective aperture, thereby causing poor dark light effect and poor blur effect.

[0112] As the aperture of the periscopic camera module becomes larger, the size of the prism also needs to increase, which makes the weight of the prism larger, and in turn increases the size and weight of the periscopic camera module. Moreover, when the prism is driven to move by a motor to realize the optical anti-shake function of the periscopic camera module, the larger size and larger weight of the prism put higher requirements on the thrust of the motor. Due to the increase in size and weight of the prism, the space occupied by the prism in the periscopic camera module is larger, which in turn causes less space available for the motor, affecting the driving effect. The dual requirements of increasing driving force and reducing installation space undoubtedly put higher requirements on the motor.

[0113] The present application mainly realizes the large aperture of the periscopic camera module from the aspects of optical path design and optical parameter control from the perspective of optical design, reduces the shoulder height of the lower group lens set of the periscopic camera module, and ensures the imaging quality and optical anti-shake performance of the periscopic camera module.

[0114] In an embodiment of the present application, a light correction element with a non-planar surface type is arranged on the light entrance side of the reflecting element to adjust the direction of the light rays towards the reflecting element, realize light convergence, and increase the amount of light entering by converging the light rays, so that the effective aperture of the periscopic camera module is increased without increasing the height size of the module; a light correction element with a non-planar surface type is also arranged on the light exit side of the reflecting element to adjust the light rays reflected by the reflecting element, realize light expansion, and make the light rays reflected by the reflecting element exit to the lens module in a predetermined manner.

[0115] Further, the light correction element arranged on the light incident side of the reflecting element can be arranged on the reflecting element by way of integral molding or by way of being attached after molding. However, it can be understood that when the light correction element is closely attached to the reflecting element (for example, a plane mirror), the surface of the light correction element that is attached to the plane mirror is a plane, and the surface that is not closely attached to the reflecting element can form a light correction surface; accordingly, the light correction element can only correct the light once, and the correction effect can not be obvious.

[0116] Correspondingly, the present application further proposes that the light correction element is arranged to be spaced apart from the reflecting element when arranged, so that the surface of the light correction element facing the reflecting element can also be selectively provided with a non-planar surface type, increasing the number of times of correction of the light by the light correction element and improving the correction effect.

[0117] Further, when the reflecting element is implemented as a prism, the light correction element is arranged on the surface on the light incident side and the surface on the light exit side of the prism, which further increases the size and weight of the reflecting element, and further causes the size and weight of the periscope type camera module to increase.

[0118] Based on this, the present application proposes an optical system, which sequentially comprises, from the object side to the image side: a first lens, a plane mirror, a second lens, and a lower group lens set; the first lens has a positive focal power and is used for converging light; the plane mirror is used for reflecting the light; the second lens has a negative focal power and is used for expanding the light; the lower group lens set comprises a plurality of lenses arranged in sequence; wherein the first lens and the second lens satisfy the following condition: 0.86<|f1 / f2|<1.2; 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; and |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.

[0119] The application also provides an optical system, which comprises, in order from the object side to the image side, a first lens, a plane mirror, a second lens, and a lower group lens set; the first lens has positive focal power and is used for converging light; the plane mirror is used for reflecting the light; the second lens has negative focal power and is used for diverging the light; the lower group lens set comprises a plurality of lenses arranged in order; wherein the first lens and the second lens satisfy the following condition: 0.70<|f1 / f2|<1.2; 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; and |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.

[0120] After introducing the basic principles of the application, various non-limiting embodiments of the application will be specifically described below with reference to the accompanying drawings.

[0121] Glossary

[0122] For the convenience of understanding, the technical terms involved in the application will be explained and described below.

[0123] 1. Optical axis: the direction of the optical system conducting 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.

[0124] 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.

[0125] 3. Focal length: also known as focal length, it is a way of measuring 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.

[0126] 4. Aperture: it is a device used to control the amount of light that passes through the lens and enters the light-sensitive surface inside the body, which is usually in the lens. In the present application, Fno is used to represent the aperture of the optical system.

[0127] 5. Entrance pupil: the image of the aperture stop formed by the front optical system. The entrance pupil and exit pupil are corresponding, the conjugate image of the aperture stop in the object space is called "entrance pupil", the position and diameter of the entrance pupil represent the position and aperture of the incident light beam.

[0128] 6. F-number: equal to the focal length of the lens divided by the diameter of the entrance pupil. In the case of 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 background blur of the subject; 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 front and back of the subject.

[0129] 7. MTF (Modulation Transfer Function): Modulation Transfer Function, an important indicator describing the imaging quality of the optical system.

[0130] 8. Sensitivity: the difference between the MTF design value at a unit angle of oscillation and the MTF design value at rest.

[0131] 9. FOV: field of view of the optical system.

[0132] 10. SL: total length of the optical system in the extension direction of its set main optical axis; wherein in the present application, the total length of the optical system in the extension direction of its set main optical axis 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.

[0133] 11. GH: shoulder height of the lower lens group; in the present application, the shoulder height of the lower lens group is determined by the maximum half aperture of the lower 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 in the height direction. In the optical system, the maximum effective diameter of the lens group in the height direction is the diameter of the part that can receive light. If a stop is provided in front of the lens group, the light needs to pass through the aperture of the stop before reaching the lens group. Accordingly, in the optical system provided with a stop, the value of the maximum effective diameter of the lens group in the height direction is equal to the aperture size of the stop.

[0134] 12. D1: effective diameter of the first lens.

[0135] 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.

[0136] 14. D2: effective diameter of the second lens.

[0137] 15. CT2: center thickness of the second lens. The center thickness of the second lens is equal to the distance between its object side surface (i.e., the second object side surface) and its image side surface (i.e., the second image side surface) in the extension direction of its optical axis.

[0138] 16. fl: effective focal length of the first lens.

[0139] 17. f2: effective focal length of the second lens.

[0140] 18. f12: effective focal length of the light receiving unit formed by the first lens, the second lens, and the plane mirror therebetween.

[0141] 19. OBJ: object distance at which the optical system can achieve imaging.

[0142] 20. EFL: effective focal length of the optical system.

[0143] 21. EPD: entrance pupil diameter of the optical system.

[0144] 22. ImgH: half of the image height of the optical system, i.e., half image height.

[0145] 23. SH: total height of the optical system.

[0146] Exemplary optical system

[0147] An optical system 100 according to embodiments of the present application is illustrated. For ease of description, the periscope 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 periscope camera module extends along the third direction DL3 to define a width of the periscope camera module, extends along the second direction DL2 to define a length of the periscope camera module, and extends along the first direction DL1 to define a height of the periscope camera module. Accordingly, a length direction of the optical system 100 coincides with the second direction DL2, and a height direction of the optical system 100 coincides with the first direction DL1.

[0148] The optical system 100 is suitable for a periscope camera module, which adopts a specific optical design, and can not only achieve a large aperture, reduce the shoulder height of the lower group lens set E20A, ensure the optical anti-shake performance of the periscope camera module, but also reduce the weight of the light receiving unit E10A, and reduce the driving burden. Specifically, from the perspective of optical design, the present application mainly realizes a large aperture, reduces the shoulder height of the lower group lens set, ensures the optical anti-shake performance of the periscope camera module, reduces the weight of the light receiving unit, and reduces the driving burden from the perspective of optical element type and optical parameter control.

[0149] In terms of the optical path, the optical element capable of converging light is arranged on the light-incoming side of the reflecting element to increase the amount of incoming light, expand the aperture, and make the optical system 100 benefit from the converging effect on light, so that the optical effective diameter of the lower group lens set E20A is reduced, and the shoulder height of the lower group lens set E20A is lowered. The optical element capable of expanding light is arranged on the light-outgoing side of the reflecting element to expand the light to a certain extent, so that the light tends to be parallel to the main optical axis L1 and incident on the subsequent optical element, which can ensure the optical anti-shake performance of the periscope camera module, wherein the extension direction of the main optical axis L1 is consistent with the extension direction of the optical axis of the lower group lens set E20A, and parallel to the second direction DL2.

[0150] In terms of the type of optical element, the planar mirror E2A is used as the reflecting element. Compared with a prism, the weight of the planar mirror E2A is smaller, and even the total weight of the planar mirror E2A, the optical element for converging light, and the optical element for expansion can be smaller than the weight of the prism with the same size reflecting surface E22, so that the weight and size of the light receiving unit E10A are controlled within a certain range, thereby as much as possible not increasing the size and weight of the optical system 100, and as much as possible reducing the driving burden.

[0151] In terms of the optical parameters, various parameters of each optical element are designed to meet the requirements of the aperture, height, length, anti-shake performance, and the like.

[0152] Specifically, the optical system 100 sequentially includes, from the object side to the image side: a first lens E1, a planar mirror E2A, a second lens E3, and a lower group lens set E20A. The first lens E1 has a positive focal power for converging light. The planar mirror E2A is used for reflecting light to change the propagation path of the light. The planar mirror E2A is a total reflection planar mirror. The second lens E3 has a negative focal power for expanding light. The lower group lens set E20A includes a plurality of lenses arranged in sequence.

[0153] The optical filter E30 and / or the photosensitive chip E40 can be sequentially arranged on the image side of the lower group lens set E20A. The photosensitive chip E40 has a photosensitive surface E401 for receiving light from the lower group lens set E20A. The first lens E1, the planar mirror E2A, the second lens E3, the lower group lens set E20A, and the optical filter E30 are on the light-receiving path of the photosensitive chip E40. The optical filter E30 is used for filtering light emitted from the lower group lens set E20A. The optical filter E30 can be an IR filter.

[0154] In an embodiment of the present application, the lower group lens set E20A includes, arranged in order from the object side to the image side, a third lens E4, a fourth lens E5, a fifth lens E6, a sixth lens E7, a seventh lens E8, and an eighth lens E9.

[0155] The first lens E1, the plane mirror E2A, and the second lens E3 form a light collecting unit E10A and are taken as an upper group lens set. The third lens E4, the fourth lens E5, and the fifth lens E6 form a fixed group lens set E201A, which has positive refractive power; the sixth lens E7, the seventh lens E8, and the eighth lens E9 form a movable group lens set E202A, which has negative refractive power. The first lens E1 is close to the object side of the optical system 100; the lower group lens set E20A is close to the photosensitive chip E40.

[0156] It should be understood that the fixed group lens set E201A is fixed to the housing, and the movable group lens set E202A is movably arranged in the housing. When the periscopic camera module realizes the functions of optical focusing and / or optical zooming, the movable group lens set E202A can be driven to move along the main optical axis L1 direction by a motor (not shown), and the fixed group lens set E201A does not move.

[0157] In other words, in an embodiment of the present application, the optical system 100 described in the present application includes a converging lens (i.e., the first lens E1) with positive refractive power, a total reflection plane mirror (i.e., the plane mirror E2), a diverging lens (i.e., the second lens E2) with negative refractive power, three fixed group lenses (i.e., the third lens E4, the fourth lens E5, and the fifth lens E6), three movable group lenses (i.e., the fifth lens E6, the sixth lens E7, the seventh lens E8, and the eighth lens E9), and an IR filter. The converging lens, the total reflection plane mirror, and the diverging lens set form a first lens set; the first lens set can be defined as the light collecting unit E10A and taken as an upper group lens set; the third lens E4, the fourth lens E5, and the fifth lens E6 form a second lens set; the second lens set can be defined as a fixed group lens set E201A; the sixth lens E7, the seventh lens E8, and the eighth lens E9 form a third lens set; the third lens set can be defined as a movable group lens set E202A; the second lens set and the third lens set can be taken as a lower group lens set E20A. A diaphragm E50 can be arranged between the upper group lens set, i.e., the light collecting unit E10A, and the lower group lens set E20A, and the diaphragm E50 is close to the front end of the lower group lens set E20A.

[0158] It should be appreciated that the present application does not limit the number of lenses of the E20A, and the related configuration parameters of each lens, etc.

[0159] Since the shoulder height of the lower group lens set E20A in the optical system 100 and the total length of the optical system 100 in the extension direction of the main optical axis L1 set therein are subject to restriction requirements, and in order to make the aperture as large as possible, the converging lens is used in the present application to meet the requirements of the shoulder height of the lower group lens set E20A and the total length of the optical system 100 in the extension direction of the main optical axis L1 set therein, and the diverging lens is used to enhance the optical anti-shake performance, so that the optical system 100 obtains a larger aperture while ensuring the optical anti-shake performance of the periscope camera module. Moreover, the plane mirror E2A has a significant advantage in weight compared to the prism.

[0160] Correspondingly, the converging lens, the plane mirror, and the diverging lens are combined to form the light receiving unit E10A, which is beneficial to enlarge the aperture, obtain higher image plane brightness, imaging quality, and anti-shake performance, and reduce the overall weight of the light receiving unit E10A under the premise of meeting the size requirements of the optical system 100.

[0161] When external light enters the optical system 100, the light first enters the first lens E1 from the first direction DL1, is converged by the first lens E1, reaches the plane mirror E2A, is reflected by the plane mirror E2A 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 in the second direction DL2, enters the lower group lens set E20A, sequentially passes through the third lens E4, the fourth lens E5, the fifth lens E6, the sixth lens E7, the seventh lens E8, and the eighth lens E9, and then reaches the photosensitive chip E40.

[0162] Due to the convergence of the light by the first lens E1, the light is still in a converged state after being reflected by the plane mirror E2A, even after being expanded by the second lens E3. Therefore, the aperture of the light when entering the lower group lens set E20A is smaller than the aperture when entering the first lens E1. In this way, it is beneficial to reduce the optical effective diameter of the multiple lenses in the lower group lens set E20A, and further reduce the height of the lower group lens set E20A and the shoulder height of the lower group lens set E20A in the optical system 100.

[0163] It should be appreciated that if the second lens E3 is not provided, the light rays are converged by the first lens E1 and then reach the plane mirror E2A, are reflected by the plane mirror E2A and then directly reach the lower group lens set E20A, and are still converging to the center when reaching the lower group lens set E20A. In this case, if the plane mirror E2A is driven to achieve optical image stabilization, the plane mirror E2A moves, and the deflection angles of the light rays in different directions at the edge are different. Specifically, because all the light rays converge to the center, but all the light rays are offset in the same direction when the plane mirror E2A is driven to move for optical image stabilization, the deflection angles of the light rays in different directions at the edge after passing through the plane mirror E2A are different, and the drop value of the MTF of the optical system 100 is large, that is, the image stabilization 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 per unit angle of jitter, and can also be referred to as the optical image stabilization (OIS) sensitivity.

[0164] In the present application, the second lens E3 is provided to expand the light rays passing through the second lens E3, so that the light rays emitted by the second lens E3 are incident on the lower group lens set E20A in a direction close to parallel to the principal axis L1. It should be appreciated that because the light rays have been expanded in advance at the second lens E3, the light rays at different positions at the edge propagate in a direction close to parallel to the principal axis L1, and even if the plane mirror E2A is driven to achieve optical image stabilization, the movement of the plane mirror E2A has little effect on the positions of the light rays on the lower group lens set E20A, the drop value of the MTF of the optical system 100 is small, that is, the image stabilization sensitivity is low.

[0165] 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 plane mirror E2A has a reflecting surface E22. The first image side E12 of the first lens E1 faces the reflecting surface E22 of the plane mirror E2A; and the second object side E31 of the second lens E3 faces the reflecting surface E22 of the plane mirror E2A.

[0166] It is worth mentioning that, compared with the prism, the weight of the plane mirror E2A is smaller, and even the total weight of the plane mirror E2A, the first lens E1 and the second lens E3 can be smaller than the weight of the prism with the same size of the reflecting surface E22, so that the optical system 100 can control the weight and size of the light receiving unit E10A within a certain range while realizing a large aperture, thereby as far as possible not increasing the size and weight of the optical system 100, and as far as possible reducing the driving burden.

[0167] In the present application, the first lens E1 is spaced apart from the plane mirror E2A, and the second lens E3 is spaced apart from the plane mirror E2A.

[0168] The spacing between the first lens E1 and the plane mirror E2A, and the spacing between the second lens E3 and the plane mirror E2A provide selectivity for the face type design of the first lens E1 towards the plane mirror E2A and the face type design of the second lens E3 towards the plane mirror E2A, and improve the design flexibility of the face type design of the first lens 12 towards the plane mirror E2A and the face type design of the second lens E3 towards the plane mirror E2A.

[0169] It should be understood that, in the present application, the first lens E1 is spaced apart from the plane mirror E2A means that there is a gap between the first lens E1 and at least a part of the reflecting element plane mirror E2A, rather than no contact between the first lens E1 and the plane mirror E2A; the second lens E3 is spaced apart from the plane mirror E2A means that there is a gap between the second lens E3 and at least a part of the plane mirror E2A, rather than no contact between the second lens E3 and the plane mirror E2A.

[0170] The present application considers that if the first lens E1 or the second lens E3 can only correct light rays for a single time, the correction effect can not be obvious. Accordingly, the present application proposes that the first object side E11 and the first image side E12 of the first lens E1 can be designed as non-planar, and the second object side E31 and the second image side E32 of the second lens E3 can be designed as non-planar, so that the optical system 100 can correct light rays multiple times through the first lens E1 and the second lens E3, and can improve the correction effect to a certain extent.

[0171] Correspondingly, in an embodiment of the present application, the first object side E11 of the first lens E1 has a convex surface shape, and the first image side E12 of the first lens E1 has a convex surface shape, so that the first lens E1 can adjust the light multiple times. The second object side E31 of the second lens E3 has a concave surface shape, and the second image side E32 of the second lens E3 has a concave surface shape, so that the second lens E3 can adjust the light multiple times.

[0172] The effective diameter and the center thickness of the first lens E1 affect the overall height, i.e., the total height, of the optical system 100, and also affect the aperture of the optical system 100. In the embodiments of the present application, the effective diameter and the center thickness of the first lens E1 satisfy the following conditions:

[0173] 8.8 < D1 / CT1 < 17.8; in some embodiments of the present application, for example, embodiments 1 to 5, 9.8 < D1 / CT1 < 13.3; in other embodiments of the present application, for example, embodiments 6 to 10, 8.8 < D1 / CT1 < 17.8; 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 D1 to CT1, i.e., the ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1, wherein the ratio of D1 to CT1 is the value obtained by D1 to CTI; the ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1 is the value obtained by the effective diameter of the first lens E1 to the center thickness of the first lens E1. The center thickness of the first lens E1 is equal to the distance between its object side, i.e., the first object side E11, and its image side, i.e., the first image side 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.

[0174] When 8.8 < D1 / CT1 < 17.8, the optical system 100 can have a more compact structure under the premise of ensuring the processability of the first lens E1, which is beneficial to the shortening of the total height of the optical system 100 and the improvement of the aperture size.

[0175] 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:

[0176] 7.1 < D2 / CT2 < 12.4; in some embodiments of the present application, for example, in Embodiments 1 to 5, 7.1 < D2 / CT2 < 9.8; in some other embodiments of the present application, for example, in Embodiments 6 to 10, 8.6 < D2 / CT2 < 12.4; 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.

[0177] When 7.1 < D2 / CT2 < 12.4, the optical system 100 can have a more compact structure while 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 anti-shake performance of the periscopic camera module.

[0178] The effective focal length of the first lens E1 affects the refractive power of the first lens E1 and the shoulder height of the lower group lens set E20A in the optical system 100. In the embodiments of the present application, the effective focal length of the first lens E1 satisfies the following condition:

[0179] f1 / EFL > 2.1; in some embodiments of the present application, for example, in Embodiments 1 to 5, 2.2 < f1 / EFL < 3.15; in some other embodiments of the present application, for example, in Embodiments 6 to 10, 2.1 > f1 / EFL; 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 value obtained by f1 divided by 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 value obtained by the effective focal length of the first lens E1 divided by the effective focal length of the optical system 100.

[0180] When f1 / EFL>2.1, it can be ensured that the first lens E1 has sufficient refractive power, which helps to reduce the shoulder height of the lower group lens set E20A. The shoulder height of the lower group lens set E20A is determined by the maximum half aperture of all lenses in the lower group lens set E20A in the height direction of the optical system 100.

[0181] 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 optical image stabilization performance of the optical system 100 can be adjusted, and at the same time, the total length of the lower group lens set E20A of the optical system 100 and the shoulder height of the lower group lens set E20A 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:

[0182] 0.70<|f1 / f2|<1.2; in some embodiments of the present application, for example, embodiments 1 to 5, 0.86<|f1 / f2|<1.2; in some other embodiments of the present application, for example, embodiments 6 to 10, 0.70<|f1 / f2|<1.0; 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 value obtained by f1 to 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 value obtained by 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 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.

[0183] When 0.70<|f1 / f2|<1.2, the optical system 100 can meet the requirements of large aperture and optical image stabilization performance of the periscopic camera module while shortening the total length of the lens group of the optical system 100 and the shoulder height of the lower group lens set E20A in the optical system 100.

[0184] Specifically, the smaller the absolute value of the effective focal length of the first lens E1, the stronger the converging ability of the first lens E1 on the light rays, and the greater the effect of expanding the aperture. After the light rays are converged by the first lens E1, the light rays are still in a converging state in the process of reaching the second lens E3 after being reflected by the plane mirror E2A, so that the aperture of the light rays reaching the second lens E3 is reduced, which is beneficial to reducing the optical effective diameter of the plurality of lenses in the lower group lens assembly E20A, and further helps to reduce the shoulder height of the lower group lens assembly E20A. The second lens E3 is used to expand the light rays, ensure the optical anti-shake performance of the periscope camera module, reduce the beam angle of the light rays entering the lower group lens assembly E20A, and ensure the optical anti-shake performance of the periscope camera module. Accordingly, the smaller the beam angle of the light rays expanded by the second lens E3, the better the optical anti-shake performance of the periscope camera module. In the present application, the beam angle refers to the angle between the propagation direction of the light rays and the extension direction of the principal axis L1 on the lens surface closest to the object side in the lower group lens assembly E20A. When the light rays expanded by the second lens E3 are in a direction close to parallel to the principal axis L1, the beam angle of the light rays expanded by the second lens E3 approaches 0.

[0185] Further, in an embodiment of the present application, as shown in FIG. 51, the light rays reach the first object side surface E11 of the first lens E1 at an incident angle a and are emitted from the first image side surface E12 of the first lens E1 to the plane mirror E2A at an exit angle b, where b>a, that is, the light rays are converged in the first lens E1, which helps to reduce the optical effective diameter of the plurality of lenses in the lower group lens assembly E20A and reduce the shoulder height of the lower group lens assembly E20A. It should be understood that the incident angle a is the angle between the propagation direction of the light rays and the axis extending along the first direction DL1 on the first object side surface E11, and the exit angle b is the angle between the propagation direction of the light rays and the axis extending along the first direction DL1 on the first image side surface E12.

[0186] The light rays are still in a converging state after being reflected by the plane mirror E2A and reaching the second lens E3. The light rays are expanded in the second lens E3 and reach the third object side E41 of the third lens E4 of the lower group lens set E20A with a beam angle c, where b > c > 0°, that is, the light rays are expanded in the second lens E3 and propagate in a direction close to parallel to the main optical axis L1. In other words, compared with the path of the light rays before entering the first lens E1, the light rays still propagate in a converging state after passing through the first lens E1, the plane mirror E2A and the second lens E3, and the light rays emitted by the second lens E3 propagate in a direction close to parallel to the main optical axis L1. It should be understood that the beam angle c is the included angle between the propagation direction of the light rays and an axis extending along the second direction DL2 on the third object side E41 of the third lens E4.

[0187] It should be understood that the width and height of the lens barrel for carrying the lower group lens set E20A are generally determined by the aperture size of the lens closest to the object side in the lower group lens set E20A, for example, the aperture size of the third lens E4. The converging effect of the first lens E1 on the light rays can reduce the shoulder height of the lower group lens set E20A, which helps to reduce the size of the lower group lens set E20A.

[0188] If the beam angle of the light rays expanded by the second lens E3 is large, for example, in an embodiment of the present application, the expansion ability of the second lens E3 on the light rays is weak, so that the light rays are still in a converging state after being expanded by the second lens E3, that is, b > c > 0. In this case, the expansion effect of the second lens E3 is not ideal, and the optical anti-shake effect of the periscopic camera module is poor. Further, it will cause the amount of light entering the lower group lens set E20A to decrease, which affects the optical performance of the periscopic camera module.

[0189] In another embodiment of the present application, the expansion ability of the second lens E3 on the light rays is strong, so that the light rays are over-expanded, that is, c > b. In this case, the effect of reducing the shoulder height of the lower group lens set E20A is poor, the expansion function of the second lens E3 is not effectively utilized, and further affects the total height of the optical system 100.

[0190] The effective focal length of the light receiving unit E10A affects the converging ability of the light receiving unit E10A as a whole, the incident angle of the light rays entering the lower group lens set E20A, the shoulder height of the lower group lens set E20A in the optical system 100, and the optical anti-shake performance of the periscopic camera module. In an embodiment of the present application, the effective focal length of the light receiving unit E10A satisfies the following conditions:

[0191] 5.7 < f12 / EFL < 23.7; in some embodiments of the present application, for example, in Embodiments 1-5, 9.0 < f12 / EFL < 23.7; in some other embodiments of the present application, for example, in Embodiments 6-10, 5.7 < f12 / EFL < 13.8; wherein f12 represents the effective focal length of the light receiving unit E10A; f12 / EFL represents the ratio of f12 to EFL, i.e., the ratio of the effective focal length of the light receiving unit E10A to the effective focal length of the optical system 100; the ratio of f12 to EFL is the value obtained by f12 divided by EFL; the ratio of the effective focal length of the light receiving unit E10A to the effective focal length of the optical system 100 is the value obtained by the effective focal length of the light receiving unit E10A divided by the effective focal length of the optical system 100.

[0192] When 5.7 < f12 / EFL < 23.7, the light receiving unit E10A has a certain convergence ability, which helps to reduce the shoulder height of the lower group lens set E20A in the optical system 100 and ensure that the light passes through the light receiving unit E10A and enters the lower group lens set E20A at a smaller angle with the extension direction of the principal optical axis L1, which helps to improve the optical anti-shake performance of the periscopic camera module.

[0193] The optical parameters, such as optical power and focal length, of the third lens E4, the fourth lens E5, the fifth lens E6, the sixth lens E7, the seventh lens E8 and the eighth lens E9 can be configured according to requirements.

[0194] In embodiments of the present application, the length of the optical system 100 in the extension direction of the principal optical axis L1 thereof is defined as the length of the optical system 100. In embodiments of the present application, the extension direction of the principal optical axis L1 of the optical system 100 is consistent with the extension direction of the optical axis of the lower group lens set E20A. The length direction of the optical system 100 is consistent with the extension direction of the principal optical axis L1; the height direction of the optical system 100 is perpendicular to the extension direction of the principal optical axis L1.

[0195] In embodiments of the present application, the optical system 100 satisfies the following conditions, so that the optical system 100 realizes long focal length while the total length is controlled within a certain range:

[0196] SL / EFL < 1.51; in some embodiments of the present application, for example, in Embodiments 1-5, 1.4 < SL / EFL < 1.5; in other embodiments of the present application, for example, in Embodiments 6-10, SL / EFL < 1.51; 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 SL to EFL, i.e., 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; the ratio of SL to EFL is the value obtained by dividing SL by EFL; 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 is the value obtained by dividing the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 by the effective focal length of the optical system 100.

[0197] In the embodiments of the present application, the optical system 100 also satisfies the following condition, so that the optical system 100 achieves a large aperture while the total length is controlled within a certain range:

[0198] 2.8 < SL / EPD < 3.6; in some embodiments of the present application, for example, in Embodiments 1-5, 2.8 < SL / EPD < 3.6; in other embodiments of the present application, for example, in Embodiments 6-10, 3.0 < SL / EPD < 3.4; 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 SL to EPD, i.e., 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; the ratio of SL to EPD is the value obtained by dividing SL by EPD; 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 is the value obtained by dividing the total length of the optical system 100 in the extension direction of the principal optical axis L1 set by the optical system 100 by the entrance pupil diameter of the optical system 100.

[0199] In the embodiments of the present application, the optical system 100 also satisfies the following condition, so that the optical system 100 achieves a large aperture while the shoulder height is controlled within a certain range:

[0200] 0.33 < GH / EPD < 1.5; in some embodiments of the present application, for example, Embodiment 1 to Embodiment 5, 0.33 < GH / EPD < 0.4; in some other embodiments of the present application, for example, Embodiment 6 to Embodiment 10, 0.70 < GH / EPD < 1.5; wherein GH represents the shoulder height of the lower group lens set E20A; 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 lower group lens set E20A 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 lower group lens set E20A to the entrance pupil diameter of the optical system 100 is the value obtained by the shoulder height of the lower group lens set E20A divided by the entrance pupil diameter of the optical system 100.

[0201] In the embodiments of the present application, the optical system 100 further satisfies the following condition, so that the optical system 100 realizes a large image surface while realizing a large aperture:

[0202] 0.33 < Fno / ImgH; in some embodiments of the present application, for example, Embodiment 1 to Embodiment 5, 0.35 < Fno / ImgH < 0.42; in some other embodiments of the present application, for example, Embodiment 6 to Embodiment 10, 0.33 < Fno / ImgH; wherein Fno represents the aperture of the optical system 100; ImgH represents the half image height of the optical system 100; Fno / ImgH represents the ratio of Fno to ImgH, i.e., the ratio of the aperture of the optical system 100 to the half image height of the optical system 100; the ratio of Fno to ImgH is the value obtained by Fno divided by ImgH; the ratio of the aperture of the optical system 100 to the half image height of the optical system 100 is the value obtained by the aperture of the optical system 100 divided by the half image height of the optical system 100.

[0203] In the embodiments of the present application, the optical system 100 further satisfies the following condition, so that the optical system 100 realizes a large aperture while shortening the total height of the optical system 100:

[0204] 0.8 < SH / EPD < 1.1; in some embodiments of the present application, for example, embodiments 1-5, 0.8 < SH / EPD < 1.1; in other embodiments of the present application, for example, embodiments 6-10, 1.0 < SH / EPD < 1.1; wherein SH represents the total height of the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; SH / EPD represents the ratio of SH to EPD, i.e., the ratio of the total height of the optical system 100 to the entrance pupil diameter of the optical system 100; the ratio of SH to EPD is the value obtained by SH divided by EPD; the ratio of the total height of the optical system 100 to the entrance pupil diameter of the optical system 100 is the value obtained by the total height of the optical system 100 divided by the entrance pupil diameter of the optical system 100.

[0205] In the embodiments of the present application, the field of view angle of the optical system 100 is small, which is conducive 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:

[0206] tanFOV < 0.70; in some embodiments of the present application, for example, embodiments 1-5, 0.45 < tanFOV < 0.55; in other embodiments of the present application, for example, embodiments 6-10, 1.0 < SH / EPD < 1.1; wherein 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.

[0207] In the embodiments of the present application, the optical system 100 also satisfies the following condition:

[0208] 12 cm < OBJ < INF; in some embodiments of the present application, for example, embodiments 1-5, 12 cm < OBJ < INF; in other embodiments of the present application, for example, embodiments 6-10, 15 cm < OBJ < INF; wherein OBJ represents the object distance at which the optical system 100 can achieve imaging, and 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 20 cm.

[0209] 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.

[0210] Correspondingly, the application further provides a periscopic camera module, which comprises a shell and the optical system 100, wherein the optical system 100 is accommodated in the shell.

[0211] The following are ten specific embodiments formed based on the design principle of the optical system 100. Those skilled in the art should know that the ten specific embodiments listed below are only examples, and the optical system 100 can not be configured only in the following ten embodiments. Table 1 shows the conditional expressions of embodiments 1 to 5. Table 12 shows the conditional expressions of embodiments 6 to 10.

[0212] Table 1

[0213] In each embodiment, the aspherical curve equation of each lens is represented as follows:

[0214] Wherein, X represents the relative distance of the point on the aspherical surface with the distance Y from the optical axis to the intersection tangent surface on the optical axis of the aspherical surface; Y represents the vertical distance of the point on the aspherical curve from the optical axis; R represents the radius of curvature; k represents the conical coefficient; Ai represents the i-th order aspherical coefficient.

[0215] In the following table, "Sphere" represents a spherical surface; "Qcon Asphere" represents an aspherical surface; "Infinity" represents infinity.

[0216] It is worth mentioning that the structure diagram of the optical system 100 of each embodiment and the parameters of each lens thereof are generated by the optical design software. Correspondingly, the parameters (such as 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. Correspondingly, the optical parameter table in each embodiment in the application is consistent with the structure diagram of the corresponding optical system 100.

[0217] It is worth mentioning that the radius of curvature is mainly based on the concave-convex degree of the central region of the lens, and is not based on the entire surface. For aspherical surfaces, the effective diameter part outside the central region will present different surface types due to the aspherical formula.

[0218] Embodiment 1

[0219] The optical system 100 according to the embodiment 1 of the application is described below with reference to the accompanying drawings 1 to 5 of the specification. Figure 1 shows a structural schematic diagram of the optical system 100 according to the embodiment 1 of the application.

[0220] As shown in FIG. 1 and FIG. 2, the optical system 100 according to Embodiment 1 of the present application comprises, in order from the object side to the image side, a first lens E1, a plane mirror E2A, 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, an eighth lens E9, a filter E30, and a photosensitive chip E40.

[0221] 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 curved toward the image side, has a convex surface shape. The light rays incident along the first direction DL1 through the first object side surface E11 of the first lens E1 are converged by the first lens E1 and exit through the first image side surface E12 of the first lens E1.

[0222] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is planar. The light rays exiting from the first image side surface E12 of the first lens E1 are reflected after reaching the reflecting surface E22 of the plane mirror E2A.

[0223] 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 at least partially curved toward the image side, has a concave surface shape. 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. The light rays exiting from the reflecting surface E22 of the plane mirror E2A enter the second lens E3 from the second object side surface E31 of the second lens E3, are expanded by the second lens E3, and exit from the second image side surface E32 of the second lens E3.

[0224] The third lens E4 has positive refractive 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 toward the object side, has a convex surface shape, and the third image side surface E42 of the third lens E4 is at least partially curved toward the image side, has a convex surface shape. 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.

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] 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.

[0230] 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 through the filter object side E301 and the filter image side E302 of the filter E30.

[0231] Table 2

[0232] In embodiment 1, EFL = 22.47; Fno = 2.0; FOV = 28.29 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.

[0233] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 12.02; 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.

[0234] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.906; 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.

[0235] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2 = 8; 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.

[0236] An effective focal length of the first lens E1 and the second lens E3 satisfies the following condition: |f1 / f2|=0.903; 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.

[0237] The first lens E1, the plane mirror E2A and the second lens E3 form a light collecting unit E10A. An effective focal length of the light collecting unit E10A satisfies the following condition: f12 / EFL=11.6; wherein, f12 represents the effective focal length of the light collecting unit E10A; f12 / EFL represents a ratio of the effective focal length of the light collecting unit E10A to the effective focal length of the optical system 100.

[0238] Table 3

[0239] Table 2 shows specific optical parameters of each component of the embodiment 1; Table 3 shows aspherical coefficients of each lens of the embodiment 1. In the embodiment 1, the optical system 100 satisfies the following condition: SL / EFL=1.493; wherein, SL represents a total length of the optical system 100 in an extension direction of the set principal axis L1 thereof; EFL represents the effective focal length of the optical system 100; SL / EFL represents a ratio of the total length of the optical system 100 in the extension direction of the set principal axis L1 thereof to the effective focal length of the optical system 100.

[0240] SL / EPD = 2.986; wherein, SL represents a total length of the optical system 100 in an extension direction of the principal optical axis L1 set by the optical system 100; EPD represents an entrance pupil diameter of the optical system 100; SL / EPD represents a 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 = 0.356; wherein, GH represents a shoulder height of the lower group lens E20A; EPD represents an entrance pupil diameter of the optical system 100; GH / EPD represents a ratio of the shoulder height of the lower group lens E20A to the entrance pupil diameter of the optical system 100. The optical system 100 also satisfies the following condition: Fno / ImgH = 0.35; wherein, Fno represents an aperture of the optical system 100; ImgH represents a half image height of the optical system 100; Fno / ImgH represents a ratio of the aperture of the optical system 100 to the half image height of the optical system 100. SH / EPD = 0.917; wherein, SH represents a total height of the optical system 100; EPD represents an entrance pupil diameter of the optical system 100; SH / EPD represents a ratio of the total height of the optical system 100 to the entrance pupil diameter of the optical system 100.

[0241] The optical system 100 satisfies the following condition: tanFOV = 0.538; FOV represents a field of view angle of the optical system 100; tanFOV represents a tangent value of FOV, i.e., a 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 an 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.

[0242] Embodiment 2

[0243] 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.

[0244] As shown in FIGS. 6 and 7, the optical system 100 according to Embodiment 2 of the present application sequentially comprises, from the object side to the image side, a first lens E1, a plane mirror E2A, 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.

[0245] 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 surface shape of a convex surface, and the first image-side surface E12 of the first lens E1 is curved toward the image side, has a surface shape of a convex surface. A light ray incident along the first direction DL1 through the first object-side surface E11 of the first lens E1 is converged by the first lens E1 and exits through the first image-side surface E12 of the first lens E1.

[0246] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is a plane. A light ray exiting from the first image-side surface E12 of the first lens E1 is reflected after reaching the reflecting surface E22 of the plane mirror E2A.

[0247] 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 at least partially curved toward the image side, has a surface shape of a concave surface. The second image-side surface E32 of the second lens E3 is at least partially curved toward the object side, has a surface shape of a concave surface. A light ray exiting from the reflecting surface E22 of the plane mirror E2A enters the second lens E3 from the second object-side surface E31 of the second lens E3, is expanded by the second lens E3 and exits from the second image-side surface E32 of the second lens E3.

[0248] The third lens E4 has positive refractive 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 toward the object side, has a surface shape of a convex surface, and the third image-side surface E42 of the third lens E4 is at least partially curved toward the image side, has a surface shape of a convex surface. A light ray exiting from the second image-side surface E32 of the second lens E3 passes through the stop E50, enters the third lens E4 from the third object-side surface E41 of the third lens E4, and exits from the third image-side surface E42 of the third lens E4.

[0249] 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.

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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, and 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.

[0254] 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 through the filter object side E301 and the filter image side E302 of the filter E30.

[0255] In embodiment 2, EFL = 22.47; Fno = 2.35; FOV = 28.2 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.

[0256] Table 4 shows the specific optical parameters of each component of embodiment 2; and Table 5 shows the aspheric coefficients of each lens of embodiment 2.

[0257] Table 4

[0258] The effective diameter and the central thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 9.845 = 12.02; wherein D1 represents the effective diameter of the first lens E1; CT1 represents the central thickness of the first lens E1; and D1 / CT1 represents the ratio of the effective diameter of the first lens E1 to the central thickness of the first lens E1.

[0259] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.221; 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.

[0260] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2=7.59; 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.

[0261] The effective focal lengths of the first lens E1 and the second lens E3 satisfy the following condition: |f1 / f2|=1.177; 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.

[0262] The first lens E1, the plane mirror E2A and the second lens E3 form a light collecting unit E10A. The effective focal length of the light collecting unit E10A satisfies the following condition: f12 / EFL=23.694; wherein f12 represents the effective focal length of the light collecting unit E10A; f12 / EFL represents the ratio of the effective focal length of the light collecting unit E10A to the effective focal length of the optical system 100.

[0263] In Embodiment 2, the optical system 100 satisfies the following conditions: SL / EFL = 1.4; where SL represents the total length of the optical system 100 in the direction of extension of the principal optical axis L1 set for the optical system 100; EFL represents the effective focal length of the optical system 100; and SL / EFL represents the ratio of the total length of the optical system 100 in the direction of extension of the principal optical axis L1 set for the optical system 100 to the effective focal length of the optical system 100. SL / EPD = 3.29; where SL represents the total length of the optical system 100 in the direction of extension of the principal optical axis L1 set for the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; and SL / EPD represents the ratio of the total length of the optical system 100 in the direction of extension of the principal optical axis L1 set for the optical system 100 to the entrance pupil diameter of the optical system 100. GH / EPD = 0.397; where GH represents the shoulder height of the lower group lens set E20A; EPD represents the entrance pupil diameter of the optical system 100; and GH / EPD represents the ratio of the shoulder height of the lower group lens set E20A to the entrance pupil diameter of the optical system 100. Fno / ImgH = 0.411; where Fno represents the aperture of the optical system 100; ImgH represents the half image height of the optical system 100; and Fno / ImgH represents the ratio of the aperture of the optical system 100 to the half image height of the optical system 100. SH / EPD = 1.083; where SH represents the total height of the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; and SH / EPD represents the ratio of the total height of the optical system 100 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV = 0.536; where FOV represents the field of view of the optical system 100; and tanFOV represents the tangent value of FOV, i.e., the tangent value of the field of view of the optical system 100. The optical system 100 satisfies the following condition: 12 cm ≤ OBJ < INF; where OBJ represents the object distance at which the optical system 100 can achieve imaging; and 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 12 cm.

[0264] Table 5

[0265] Embodiment 3

[0266] The optical system 100 according to Embodiment 3 of the present application is described below with reference to FIGS. 11 to 15 of the drawings accompanying the present specification. FIG. 11 shows a structural schematic diagram of the optical system 100 according to Embodiment 3 of the present application.

[0267] As shown in FIGS. 11 and 12, the optical system 100 according to Embodiment 3 of the present application sequentially includes, from the object side to the image side, a first lens E1, a plane mirror E2A, 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, an eighth lens E9, a filter E30, and a photosensitive chip E40.

[0268] 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 curved toward the image side, has a convex surface shape. A light ray incident along the first direction DL1 through the first object side surface E11 of the first lens E1 is converged by the first lens E1 and exits through the first image side surface E12 of the first lens E1.

[0269] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is a plane. A light ray exiting from the first image side surface E12 of the first lens E1 is reflected after reaching the reflecting surface E22 of the plane mirror E2A.

[0270] 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 at least partially curved toward the image side, has a concave surface shape. 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 reflecting surface E22 of the plane mirror E2A enters the second lens E3 from the second object side surface E31 of the second lens E3, is expanded by the second lens E3, and exits from the second image side surface E32 of the second lens E3.

[0271] The third lens E4 has positive refractive 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 toward the object side, has a convex surface shape, and the third image side surface E42 of the third lens E4 is at least partially curved toward the image side, has a convex surface shape. A light ray exiting from the second image side surface E32 of the second lens E3 passes through the diaphragm E50, enters the third lens E4 from the third object side surface E41 of the third lens E4, and exits from the third image side surface E42 of the third lens E4.

[0272] 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. 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.

[0273] 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. 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.

[0274] 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. 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.

[0275] 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. 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.

[0276] Table 6

[0277] 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.

[0278] 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 through the filter object side E301 and the filter image side E302 of the filter E30.

[0279] Table 6 shows specific optical parameters of various components of embodiment 3; Table 7 shows aspherical coefficients of various lenses of embodiment 3.

[0280] In embodiment 3, EFL = 22.47; Fno = 2.0; FOV = 28.4 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.

[0281] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 10.727; 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.

[0282] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.83; 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.

[0283] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2 = 9.75; 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.

[0284] Table 7

[0285] The effective focal length of the first lens E1 and the second lens E3 satisfies the following condition: |f1 / f2|=0.869; 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.

[0286] The first lens E1, the plane mirror E2A, and the second lens E3 form a light collecting unit E10A. The effective focal length of the light collecting unit E10A satisfies the following condition: f12 / EFL=9.653; where f12 represents the effective focal length of the light collecting unit E10A; f12 / EFL represents the ratio of the effective focal length of the light collecting unit E10A to the effective focal length of the optical system 100.

[0287] In Embodiment 3, the optical system 100 satisfies the following conditions: SL / EFL=1.476; where SL represents the total length of the optical system 100 in the direction of extension 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 direction of extension of the principal optical axis L1 set by the optical system 100 to the effective focal length of the optical system 100. SL / EPD=2.951; where SL represents the total length of the optical system 100 in the direction of extension 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 direction of extension of the principal optical axis L1 set by the optical system 100 to the entrance pupil diameter of the optical system 100. GH / EPD=0.362; where GH represents the shoulder height of the lower group lens set E20A; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lower group lens set E20A to the entrance pupil diameter of the optical system 100.

[0288] The optical system 100 also satisfies the following conditions: Fno / ImgH=0.35; wherein, Fno represents an aperture of the optical system 100; ImgH represents a half image height of the optical system 100; Fno / ImgH represents a ratio of the aperture of the optical system 100 to the half image height of the optical system 100. SH / EPD=0.952; wherein, SH represents a total height of the optical system 100; EPD represents an entrance pupil diameter of the optical system 100; SH / EPD represents a ratio of the total height of the optical system 100 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV=0.536; FOV represents a field of view angle of the optical system 100; tanFOV represents a tangent value of FOV, i.e., a tangent value of the field of view angle of the optical system 100. The optical system 100 satisfies the following condition: 12cmOBJ<INF; wherein, OBJ represents an 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.

[0289] Embodiment 4

[0290] The optical system 100 according to Embodiment 4 of the present application is described below with reference to FIGS. 16-20 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.

[0291] As shown in FIGS. 16 and 17, the optical system 100 according to Embodiment 4 of the present application sequentially includes, from the object side to the image side, a first lens E1, a plane mirror E2A, 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.

[0292] 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 curved towards the image side, has a convex surface shape. Light rays incident along the first direction DL1 through the first object side surface E11 of the first lens E1 are converged by the first lens E1 and exit through the first image side surface E12 of the first lens E1.

[0293] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is a plane. Light rays exiting from the first image side surface E12 of the first lens E1 are reflected after reaching the reflecting surface E22 of the plane mirror E2A.

[0294] The second lens E3 has negative focal power. The second lens E3 has a second object side surface E31 and a second image side surface E32, wherein at least a part of the second object side surface E31 of the second lens E3 is curved toward the image side, having a surface type of a concave surface. The second image side surface E32 of the second lens E3 is at least partially curved toward the object side, having a surface type of a concave surface. The light rays exiting from the reflecting surface E22 of the plane mirror E2A 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 after being expanded by the second lens E3.

[0295] The third lens E4 has 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 toward the object side, having a surface type of a convex surface, and the third image side surface E42 of the third lens E4 is at least partially curved toward the image side, having a surface type 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.

[0296] The fourth lens E5 has 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 toward the object side, having a surface type of a convex surface, and the fourth image side surface E52 of the fourth lens E5 is at least partially curved toward the object side, having a surface type 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.

[0297] The fifth lens E6 has positive focal power. The fifth lens E6 has a fifth object side surface E61 and a fifth image side surface E62, wherein the fifth object side surface E61 of the fifth lens E6 is at least partially curved toward the object side, having a surface type of a convex surface, and the fifth image side surface E62 of the fifth lens E6 is at least partially curved toward the image side, having a surface type of a convex surface. The light rays exiting from the fourth image side surface E52 of the fourth lens E5 enter the fifth lens E6 from the fifth object side surface E61 of the fifth lens E6, and exit from the fifth image side surface E62 of the fifth lens E6.

[0298] The sixth lens E7 has negative refractive power. The sixth lens E7 has a sixth object-side surface E71 and a sixth image-side surface E72, wherein the sixth object-side surface E71 of the sixth lens E7 is at least partially curved toward the image side, has a concave surface shape, and the sixth image-side surface E72 of the sixth lens E7 is at least partially curved toward the image side, has a convex surface shape. The light rays exiting from the fifth image-side surface E62 of the fifth lens E6 enter the sixth lens E7 from the sixth object-side surface E71 of the sixth lens E7, and exit from the sixth image-side surface E72 of the sixth lens E7.

[0299] Table 8

[0300] 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 toward the image side, has a concave surface shape, and the seventh image-side surface E82 of the seventh lens E8 is at least partially curved toward the image side, has a convex surface shape. 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.

[0301] 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 toward the object side, has a convex surface shape, and the eighth image-side surface E92 of the eighth lens E9 is at least partially curved toward the object side, has a concave surface shape. 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.

[0302] 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.

[0303] In Embodiment 4, EFL = 26.44; Fno = 2.4; FOV = 24.24 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.

[0304] Table 8 shows specific optical parameters of each component of Embodiment 4; and Table 9 shows aspherical coefficients of each lens of Embodiment 4.

[0305] An effective diameter and a center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 11.893; where 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.

[0306] An effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 3.149; where f1 represents the effective focal length of the first lens E1, 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.

[0307] An effective diameter and a center thickness of the second lens E3 satisfy the following condition: D2 / CT2 = 7.145; where 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.

[0308] Effective focal lengths of the first lens E1 and the second lens E3 satisfy the following condition: |f1 / f2| = 0.975; 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 a ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3, and |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.

[0309] The first lens E1, the planar mirror E2A, and the second lens E3 form a light collecting unit E10A. An effective focal length of the light collecting unit E10A satisfies the following condition: f12 / EFL = 16.955; where f12 represents the effective focal length of the light collecting unit E10A, and f12 / EFL represents a ratio of the effective focal length of the light collecting unit E10A to the effective focal length of the optical system 100.

[0310] Table 9

[0311] In the embodiment 4, the optical system 100 satisfies the following conditions: SL / EFL = 1.502; 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 = 3.603; 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 = 0.356; wherein, GH represents the shoulder height of the lower group lens set E20A; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lower group lens set E20A to the entrance pupil diameter of the optical system 100.

[0312] The optical system 100 also satisfies the following conditions: Fno / ImgH = 0.42; wherein, Fno represents the aperture of the optical system 100; ImgH represents the half image height of the optical system 100; Fno / ImgH represents the ratio of the aperture of the optical system 100 to the half image height of the optical system 100. SH / EPD = 0.944; wherein, SH represents the total height of the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; SH / EPD represents the ratio of the total height of the optical system 100 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV = 0.45; 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.

[0313] Embodiment 5

[0314] The optical system 100 according to the embodiment 5 of the present application is described below with reference to FIGS. 21 to 25 of the drawings of the present application. FIG. 21 shows a structural schematic diagram of the optical system 100 according to the embodiment 5 of the present application.

[0315] 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 plane mirror E2A, 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, an eighth lens E9, a filter E30, and a photosensitive chip E40.

[0316] 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 curved toward the image side, has a convex surface shape. A light ray incident along the first direction DL1 through the first object side surface E11 of the first lens E1 is converged by the first lens E1 and exits through the first image side surface E12 of the first lens E1.

[0317] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is a plane. A light ray exiting from the first image side surface E12 of the first lens E1 is reflected after reaching the reflecting surface E22 of the plane mirror E2A.

[0318] 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 at least partially curved toward the image side, has a concave surface shape. 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 reflecting surface E22 of the plane mirror E2A enters the second lens E3 from the second object side surface E31 of the second lens E3, is expanded by the second lens E3, and exits from the second image side surface E32 of the second lens E3.

[0319] The third lens E4 has positive refractive 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 toward the object side, has a convex surface shape, and the third image side surface E42 of the third lens E4 is at least partially curved toward the image side, has a convex surface shape. A light ray exiting from the second image side surface E32 of the second lens E3 passes through the diaphragm E50, enters the third lens E4 from the third object side surface E41 of the third lens E4, and exits from the third image side surface E42 of the third lens E4.

[0320] 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.

[0321] 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.

[0322] 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.

[0323] 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.

[0324] 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.

[0325] Table 10

[0326] 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.

[0327] In embodiment 5, EFL = 25.09; Fno = 2.0; FOV = 25.46 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.

[0328] Table 10 shows the specific optical parameters of various components of embodiment 5; Table 11 shows the aspheric coefficients of various lenses of embodiment 5.

[0329] The effective diameter and the central thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 13.243; 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 the effective diameter of the first lens E1 to the central thickness of the first lens E1.

[0330] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.539; 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.

[0331] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2=8.623; 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.

[0332] The effective focal lengths of the first lens E1 and the second lens E3 satisfy the following condition: |f1 / f2|=0.886; 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.

[0333] The first lens E1, the plane mirror E2A and the second lens E3 form a light collecting unit E10A. The effective focal length of the light collecting unit E10A satisfies the following condition: f12 / EFL=9.075; wherein f12 represents the effective focal length of the light collecting unit E10A; f12 / EFL represents the ratio of the effective focal length of the light collecting unit E10A to the effective focal length of the optical system 100.

[0334] Table 11

[0335] In Embodiment 5, the optical system 100 satisfies the following conditions: SL / EFL = 1.444; where SL represents the total length of the optical system 100 in the direction of extension of the principal optical axis L1 thereof; EFL represents the effective focal length of the optical system 100; and SL / EFL represents the ratio of the total length of the optical system 100 in the direction of extension of the principal optical axis L1 thereof to the effective focal length of the optical system 100. SL / EPD = 2.888; where SL represents the total length of the optical system 100 in the direction of extension of the principal optical axis L1 thereof; EPD represents the entrance pupil diameter of the optical system 100; and SL / EPD represents the ratio of the total length of the optical system 100 in the direction of extension of the principal optical axis L1 thereof to the entrance pupil diameter of the optical system 100. GH / EPD = 0.338; where GH represents the shoulder height of the lower group lens set E20A; EPD represents the entrance pupil diameter of the optical system 100; and GH / EPD represents the ratio of the shoulder height of the lower group lens set E20A to the entrance pupil diameter of the optical system 100. The optical system 100 also satisfies the following condition: Fno / ImgH = 0.35; where Fno represents the aperture of the optical system 100; ImgH represents the half image height of the optical system 100; and Fno / ImgH represents the ratio of the aperture of the optical system 100 to the half image height of the optical system 100. SH / EPD = 0.87; where SH represents the total height of the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; and SH / EPD represents the ratio of the total height of the optical system 100 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV = 0.476; where FOV represents the field of view of the optical system 100; and tanFOV represents the tangent value of FOV, i.e., the tangent value of the field of view of the optical system 100. The optical system 100 satisfies the following condition: 12 cm ≤ OBJ < INF; where OBJ represents the object distance at which the optical system 100 can achieve imaging; and 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 12 cm.

[0336] Table 12

[0337] Embodiment 6

[0338] 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.

[0339] 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 plane mirror E2A, 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, an eighth lens E9, a filter E30, and a photosensitive chip E40.

[0340] 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 curved toward the image side, has a convex surface shape. A light ray incident along the first direction DL1 through the first object side surface E11 of the first lens E1 is converged by the first lens E1 and exits through the first image side surface E12 of the first lens E1.

[0341] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is planar. A light ray exiting from the first image side surface E12 of the first lens E1 is reflected after reaching the reflecting surface E22 of the plane mirror E2A.

[0342] 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 at least partially curved toward the image side, has a concave surface shape. 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 reflecting surface E22 of the plane mirror E2A enters the second lens E3 from the second object side surface E31 of the second lens E3, is expanded by the second lens E3, and exits from the second image side surface E32 of the second lens E3.

[0343] The third lens E4 has positive refractive 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 toward the object side, has a convex surface shape, and the third image side surface E42 of the third lens E4 is at least partially curved toward the image side, has a convex surface shape. A light ray exiting from the second image side surface E32 of the second lens E3 passes through the diaphragm E50, enters the third lens E4 from the third object side surface E41 of the third lens E4, and exits from the third image side surface E42 of the third lens E4.

[0344] 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.

[0345] 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.

[0346] 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.

[0347] 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.

[0348] 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.

[0349] 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 through the filter object side E301 and the filter image side E302 of the filter E30.

[0350] Table 13

[0351] In embodiment 6, EFL = 22.50; Fno = 2.17; FOV = 29.10 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.

[0352] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 11.754; 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.

[0353] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.752; 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.

[0354] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2 = 12.379; 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.

[0355] The effective focal length of the first lens E1 and the second lens E3 satisfies the following condition: |f1 / f2|=0.978; 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.

[0356] The first lens E1, the plane mirror E2A and the second lens E3 form a light collecting unit E10A. The effective focal length of the light collecting unit E10A satisfies the following condition: f12 / EFL=13.758; wherein f12 represents the effective focal length of the light collecting unit E10A; f12 / EFL represents the ratio of the effective focal length of the light collecting unit E10A to the effective focal length of the optical system 100.

[0357] Table 14

[0358] In Embodiment 6, the optical system 100 satisfies the following conditions: SL / EFL = 1.452; where SL represents the total length of the optical system 100 in the direction of extension 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 direction of extension of the principal optical axis L1 set by the optical system 100 to the effective focal length of the optical system 100. SL / EPD = 3.150; where SL represents the total length of the optical system 100 in the direction of extension 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 direction of extension of the principal optical axis L1 set by the optical system 100 to the entrance pupil diameter of the optical system 100. GH / EPD = 0.850; where GH represents the shoulder height of the lower group lens set E20A; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lower group lens set E20A to the entrance pupil diameter of the optical system 100. The optical system 100 also satisfies the following condition: Fno / ImgH = 0.364; where Fno represents the aperture of the optical system 100; ImgH represents the half image height of the optical system 100; Fno / ImgH represents the ratio of the aperture of the optical system 100 to the half image height of the optical system 100. SH / EPD = 1.023; where SH represents the total height of the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; SH / EPD represents the ratio of the total height of the optical system 100 to the entrance pupil diameter of the optical system 100.

[0359] 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: 15cm ≤ OBJ < INF; where OBJ represents the object distance at which the optical system 100 can achieve 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 15cm.

[0360] Embodiment 7

[0361] 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.

[0362] As shown in FIGS. 31 and 32, the optical system 100 according to Embodiment 7 of the present application sequentially includes, from the object side to the image side, a first lens E1, a plane mirror E2A, a second lens E3, a 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.

[0363] 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 curved toward the image side, has a convex surface shape. A light ray incident along the first direction DL1 through the first object side surface E11 of the first lens E1 is converged by the first lens E1 and exits through the first image side surface E12 of the first lens E1.

[0364] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is planar. A light ray exiting from the first image side surface E12 of the first lens E1 is reflected after reaching the reflecting surface E22 of the plane mirror E2A.

[0365] 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 at least partially curved toward the image side, has a concave surface shape. 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 reflecting surface E22 of the plane mirror E2A enters the second lens E3 from the second object side surface E31 of the second lens E3, is expanded by the second lens E3, and exits from the second image side surface E32 of the second lens E3.

[0366] The third lens E4 has positive refractive 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 toward the object side, has a convex surface shape, and the third image side surface E42 of the third lens E4 is at least partially curved toward the image side, has a convex surface shape. A light ray exiting from the second image side surface E32 of the second lens E3 passes through the stop E50, enters the third lens E4 from the third object side surface E41 of the third lens E4, and exits from the third image side surface E42 of the third lens E4.

[0367] 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. 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.

[0368] 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. 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.

[0369] 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. 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.

[0370] 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. 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.

[0371] 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.

[0372] 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.

[0373] In embodiment 7, EFL = 22.50; Fno = 2.23; 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 an abbreviation of f-number, FOV represents the field of view angle of the optical system 100.

[0374] Table 15 shows the specific optical parameters of the various components of embodiment 7; Table 16 shows the aspheric coefficients of the various lenses of embodiment 7.

[0375] Table 15

[0376] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 11.804; 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.

[0377] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.890; 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.

[0378] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2=12.055; 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.

[0379] The effective focal lengths of the first lens E1 and the second lens E3 satisfy the following condition: |f1 / f2|=0.732; 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.

[0380] The first lens E1, the planar mirror E2A and the second lens E3 form a light collecting unit E10A. The effective focal length of the light collecting unit E10A satisfies the following condition: f12 / EFL=7.324; wherein f12 represents the effective focal length of the light collecting unit E10A; f12 / EFL represents the ratio of the effective focal length of the light collecting unit E10A to the effective focal length of the optical system 100.

[0381] Table 16

[0382] The optical system 100 satisfies the following conditions: SL / EFL = 1.462; 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 = 3.260; 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 = 0.841; wherein, GH represents the shoulder height of the lower group lens set E20A; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lower group lens set E20A to the entrance pupil diameter of the optical system 100; Fno / ImgH = 0.375; wherein, Fno represents the aperture of the optical system 100; ImgH represents the half image height of the optical system 100; Fno / ImgH represents the ratio of the aperture of the optical system 100 to the half image height of the optical system 100. SH / EPD = 1.048; wherein, SH represents the total height of the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; SH / EPD represents the ratio of the total height of the optical system 100 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following conditions: 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 conditions: 15cm ≤ 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 15cm.

[0383] Embodiment 8

[0384] The optical system 100 according to Embodiment 8 of the present application is described below with reference to FIGS. 36 to 40 of the drawings accompanying the present application specification. FIG. 36 shows a structural schematic diagram of the optical system 100 according to Embodiment 8 of the present application.

[0385] As shown in FIGS. 36 and 37, the optical system 100 according to Embodiment 8 of the present application sequentially includes, from the object side to the image side, a first lens E1, a plane mirror E2A, a second lens E3, a 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.

[0386] 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 curved toward the image side, has a convex surface shape. A light ray incident along the first direction DL1 through the first object side surface E11 of the first lens E1 is converged by the first lens E1 and exits through the first image side surface E12 of the first lens E1.

[0387] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is planar. A light ray exiting from the first image side surface E12 of the first lens E1 is reflected after reaching the reflecting surface E22 of the plane mirror E2A.

[0388] 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 at least partially curved toward the image side, has a concave surface shape. 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 reflecting surface E22 of the plane mirror E2A enters the second lens E3 from the second object side surface E31 of the second lens E3, is expanded by the second lens E3, and exits from the second image side surface E32 of the second lens E3.

[0389] The third lens E4 has positive refractive 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 toward the object side, has a convex surface shape, and the third image side surface E42 of the third lens E4 is at least partially curved toward the image side, has a convex surface shape. A light ray exiting from the second image side surface E32 of the second lens E3 passes through the stop E50, enters the third lens E4 from the third object side surface E41 of the third lens E4, and exits from the third image side surface E42 of the third lens E4.

[0390] 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 type of concave, the fourth image side E52 of the fourth lens E5 is at least partially curved toward the object side, has a surface type of concave. 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.

[0391] 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 type of convex, the fifth image side E62 of the fifth lens E6 is at least partially curved toward the image side, has a surface type of convex. 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.

[0392] 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 surface type of concave, the sixth image side E72 of the sixth lens E7 is at least partially curved toward the object side, has a surface type of concave. 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.

[0393] 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 type of concave, the seventh image side E82 of the seventh lens E8 is at least partially curved toward the image side, has a surface type of convex. 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.

[0394] 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.

[0395] 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.

[0396] Table 17 shows specific optical parameters of various components of embodiment 8; Table 18 shows aspherical coefficients of various lenses of embodiment 8.

[0397] In embodiment 8, EFL = 19.50; 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.

[0398] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 8.846; 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.

[0399] Table 17

[0400] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.192; 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.

[0401] An effective diameter and a center thickness of the second lens E3 satisfy the following condition: D2 / CT2=8.630; 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.

[0402] Effective focal lengths of the first lens E1 and the second lens E3 satisfy the following condition: |f1 / f2|=0.781; 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.

[0403] The first lens E1, the plane mirror E2A, and the second lens E3 form a light collecting unit E10A. An effective focal length of the light collecting unit E10A satisfies the following condition: f12 / EFL=5.748; wherein f12 represents the effective focal length of the light collecting unit E10A; f12 / EFL represents a ratio of the effective focal length of the light collecting unit E10A to the effective focal length of the optical system 100.

[0404] In Embodiment 8, the optical system 100 satisfies the following conditions: SL / EFL = 1.254; where SL represents the total length of the optical system 100 in the direction of extension of the principal optical axis L1 set for 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 direction of extension of the principal optical axis L1 set for the optical system 100 to the effective focal length of the optical system 100. SL / EPD = 3.282; where SL represents the total length of the optical system 100 in the direction of extension of the principal optical axis L1 set for 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 direction of extension of the principal optical axis L1 set for the optical system 100 to the entrance pupil diameter of the optical system 100. GH / EPD = 0.823; where GH represents the shoulder height of the lower group lens E20A; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lower group lens E20A to the entrance pupil diameter of the optical system 100; Fno / ImgH = 0.595; where Fno represents the aperture of the optical system 100; ImgH represents the half image height of the optical system 100; Fno / ImgH represents the ratio of the aperture of the optical system 100 to the half image height of the optical system 100. SH / EPD = 1.085; where SH represents the total height of the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; SH / EPD represents the ratio of the total height of the optical system 100 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 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. The optical system 100 satisfies the following condition: 15 cm ≤ OBJ < INF; where OBJ represents the object distance at which the optical system 100 can achieve 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 15 cm.

[0405] Table 18

[0406] Embodiment 9

[0407] 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.

[0408] As shown in FIGS. 41 and 42, the optical system 100 according to Embodiment 9 of the present application sequentially includes, from the object side to the image side, a first lens E1, a plane mirror E2A, a second lens E3, a 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.

[0409] 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 surface shape of a convex surface, and the first image side surface E12 of the first lens E1 is curved toward the object side, has a surface shape of a concave surface. A light ray incident along the first direction DL1 through the first object side surface E11 of the first lens E1 is converged by the first lens E1 and exits through the first image side surface E12 of the first lens E1.

[0410] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is a plane. A light ray exiting from the first image side surface E12 of the first lens E1 is reflected after reaching the reflecting surface E22 of the plane mirror E2A.

[0411] 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 at least partially curved toward the image side, has a surface shape of a concave surface. The second image side surface E32 of the second lens E3 is at least partially curved toward the image side, has a surface shape of a convex surface. A light ray exiting from the reflecting surface E22 of the plane mirror E2A enters the second lens E3 from the second object side surface E31 of the second lens E3, is expanded by the second lens E3, and exits from the second image side surface E32 of the second lens E3.

[0412] The third lens E4 has positive refractive 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 toward the object side, has a surface shape of a convex surface, and the third image side surface E42 of the third lens E4 is at least partially curved toward the image side, has a surface shape of a convex surface. A light ray exiting from the second image side surface E32 of the second lens E3 passes through the stop E50, enters the third lens E4 from the third object side surface E41 of the third lens E4, and exits from the third image side surface E42 of the third lens E4.

[0413] 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. 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.

[0414] 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. 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.

[0415] 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. 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.

[0416] Table 19

[0417] 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. 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.

[0418] 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.

[0419] 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.

[0420] In embodiment 9, EFL = 23.8; Fno = 2.0; and FOV = 28.1 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 an abbreviation of f-number, FOV represents the field of view angle of the optical system 100.

[0421] Table 19 shows the specific optical parameters of various components of embodiment 9; Table 20 shows the aspheric coefficients of various lenses of embodiment 9.

[0422] Table 20

[0423] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 10.988; 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.

[0424] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.572; 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.

[0425] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2=12.203; 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.

[0426] The effective focal lengths of the first lens E1 and the second lens E3 satisfy the following condition: |f1 / f2|=0.749; 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.

[0427] The first lens E1, the plane mirror E2A and the second lens E3 form a light collecting unit E10A. The effective focal length of the light collecting unit E10A satisfies the following condition: f12 / EFL=6.140; wherein f12 represents the effective focal length of the light collecting unit E10A; f12 / EFL represents the ratio of the effective focal length of the light collecting unit E10A to the effective focal length of the optical system 100.

[0428] In Embodiment 9, the optical system 100 satisfies the following conditions: SL / EFL = 1.511; where SL represents the total length of the optical system 100 in the direction of extension 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 direction of extension of the principal optical axis L1 set by the optical system 100 to the effective focal length of the optical system 100. SL / EPD = 3.022; where SL represents the total length of the optical system 100 in the direction of extension 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 direction of extension of the principal optical axis L1 set by the optical system 100 to the entrance pupil diameter of the optical system 100. GH / EPD = 0.839; where GH represents the shoulder height of the lower group lens E20A; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lower group lens E20A to the entrance pupil diameter of the optical system 100; Fno / ImgH = 0.334; where Fno represents the aperture of the optical system 100; ImgH represents the half image height of the optical system 100; Fno / ImgH represents the ratio of the aperture of the optical system 100 to the half image height of the optical system 100. SH / EPD = 1.027; where SH represents the total height of the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; SH / EPD represents the ratio of the total height of the optical system 100 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV = 0.534; 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. The optical system 100 satisfies the following condition: 15 cm ≤ OBJ < INF; where OBJ represents the object distance at which the optical system 100 can achieve 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 15 cm.

[0429] Embodiment 10

[0430] The optical system 100 according to Embodiment 10 of the present application is described below with reference to FIGS. 46 to 50 of the drawings accompanying the present application specification. FIG. 46 shows a structural schematic diagram of the optical system 100 according to Embodiment 10 of the present application.

[0431] As shown in FIGS. 46 and 47, the optical system 100 according to Embodiment 10 of the present application sequentially includes, from the object side to the image side, a first lens E1, a plane mirror E2A, a second lens E3, a 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.

[0432] 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 curved toward the image side, has a convex surface shape. A light ray incident along the first direction DL1 through the first object side surface E11 of the first lens E1 is converged by the first lens E1 and exits through the first image side surface E12 of the first lens E1.

[0433] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is a plane. A light ray exiting from the first image side surface E12 of the first lens E1 is reflected after reaching the reflecting surface E22 of the plane mirror E2A.

[0434] 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 at least partially curved toward the object side, has a convex surface shape. 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 reflecting surface E22 of the plane mirror E2A enters the second lens E3 from the second object side surface E31 of the second lens E3, is expanded by the second lens E3, and exits from the second image side surface E32 of the second lens E3.

[0435] The third lens E4 has positive refractive 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 toward the object side, has a convex surface shape, and the third image side surface E42 of the third lens E4 is at least partially curved toward the image side, has a convex surface shape. A light ray exiting from the second image side surface E32 of the second lens E3 passes through the stop E50, enters the third lens E4 from the third object side surface E41 of the third lens E4, and exits from the third image side surface E42 of the third lens E4.

[0436] 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.

[0437] Table 21

[0438] 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.

[0439] 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.

[0440] 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.

[0441] 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.

[0442] 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.

[0443] In embodiment 10, EFL = 20.2; Fno = 2.3; and FOV = 35.0 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, FOV represents the field of view angle of the optical system 100.

[0444] Table 21 shows the specific optical parameters of various components of embodiment 10; Table 22 shows the aspheric coefficients of various lenses of embodiment 10.

[0445] Table 22

[0446] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 11.605; 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.

[0447] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 2.993; 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.

[0448] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2=10.074; 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.

[0449] The effective focal lengths of the first lens E1 and the second lens E3 satisfy the following condition: |f1 / f2|=0.778; 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.

[0450] The first lens E1, the plane mirror E2A and the second lens E3 form a light collecting unit E10A. The effective focal length of the light collecting unit E10A satisfies the following condition: f12 / EFL=8.098; wherein f12 represents the effective focal length of the light collecting unit E10A; f12 / EFL represents the ratio of the effective focal length of the light collecting unit E10A to the effective focal length of the optical system 100.

[0451] In Embodiment 10, the optical system 100 satisfies the following conditions: SL / EFL = 1.454; 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 = 3.341; 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 = 0.964; wherein, GH represents the shoulder height of the lower group lens set E20A; EPD represents the entrance pupil diameter of the optical system 100; GH / EPD represents the ratio of the shoulder height of the lower group lens set E20A to the entrance pupil diameter of the optical system 100; Fno / ImgH = 0.354; wherein, Fno represents the aperture of the optical system 100; ImgH represents the half image height of the optical system 100; Fno / ImgH represents the ratio of the aperture of the optical system 100 to the half image height of the optical system 100. SH / EPD = 1.100; wherein, SH represents the total height of the optical system 100; EPD represents the entrance pupil diameter of the optical system 100; SH / EPD represents the ratio of the total height of the optical system 100 to the entrance pupil diameter of the optical system 100. The optical system 100 satisfies the following condition: tanFOV = 0.700; 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. The optical system 100 satisfies the following condition: 15cm≤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 15cm.

[0452] 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, and ensure the optical anti-shake performance of the periscope camera module.

[0453] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection required by the present application is defined by the appended claims and their equivalents.

[0454] Those skilled in the art will understand 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 functional and structural principles of the present application have been demonstrated 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, the optical system comprises: a first lens having positive refractive power for converging light rays; a planar mirror for reflecting the light rays; a second lens having negative refractive power for diverging the light rays; and a lower group lens set comprising a plurality of lenses arranged in order; wherein the first lens and the second lens satisfy the following condition: 0.70<|f1 / f2|<1.2; 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.

2. The optical system of claim 1, wherein, The first lens satisfies the following condition: 8.8<D1 / CT1<17.8; 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: 7.1<D2 / CT2<12.4; 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: 2.1<f1 / EFL; 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 planar mirror and the second lens form a light collecting unit, and the light collecting unit satisfies the following condition: 5.7<f12 / EFL<23.7; wherein f12 represents the effective focal length of the light collecting unit; EFL represents the effective focal length of the optical system; f12 / EFL represents the ratio of the effective focal length of the light collecting 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<0.70; wherein FOV represents the field of view of the optical system; tanFOV represents the tangent value of the field of view of the optical system.

7. The optical system of claim 1, wherein, The optical system further comprises a photosensitive chip, and the first lens, the planar mirror, the second lens and the lower group lens set are on the photosensitive path of the photosensitive chip, and the optical system satisfies the following condition: SL / EFL<1.51; 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 plane mirror, the second lens and the lower group lens set are on a photosensitive path of the photosensitive chip, and the optical system satisfies the following condition: 2.8 < SL / EPD < 3.6; 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.

9. The optical system of claim 1, wherein, The optical system satisfies the following condition: 0.33 < GH / EPD < 1.5; Wherein, GH represents a shoulder height of the lower group lens set; EPD represents an entrance pupil diameter of the optical system; and GH / EPD represents a ratio of the shoulder height of the lower group lens set to the entrance pupil diameter of the optical system.

10. The optical system of claim 1, wherein, The optical system satisfies the following object distance requirement: 12 cm < OBJ < INF; Wherein, OBJ represents an object distance that can be achieved by the optical system for imaging, and INF represents infinity.

11. The optical system of claim 1, wherein, The optical system further comprises a photosensitive chip, the photosensitive chip has a photosensitive surface, the first lens, the plane mirror, the second lens and the lower group lens set are on a photosensitive path of the photosensitive chip, and the optical system satisfies the following condition: 0.33 < Fno / ImgH; Wherein, Fno represents an aperture of the optical system; ImgH represents a half image height of the optical system; and Fno / ImgH represents a ratio of the aperture of the optical system to the half image height of the optical system.

12. The optical system of claim 1, wherein, The optical system satisfies the following condition: 0.8 < SH / EPD < 1.1; Wherein, SH represents a total height of the optical system; EPD represents an entrance pupil diameter of the optical system; and SH / EPD represents a ratio of the total height of the optical system to the entrance pupil diameter of the optical system.

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

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

15. The optical system of claim 1, wherein, The optical system further comprises a filter, and the filter is located on an image side of the lower group lens set.

16. A periscope camera module, comprising: Comprise: a housing; and The optical system as claimed in any one of claims 1 to 15 is installed in the housing.

Images