Optical system and periscopic camera module

Abstract

The invention discloses an optical system and a periscopic camera module. The optical system adopts a specific optical design, so that a large aperture can be realized, the shoulder height can be reduced, the optical anti-shake performance of the periscopic camera module can be ensured, and the weight of the light receiving unit can be reduced. Specifically, the optical system sequentially comprises a first lens, a plane mirror, a second lens and a lower lens group from an object side to an image side, the first lens has positive focal power and is used for collecting light rays; the plane mirror is used for reflecting light; the second lens has negative focal power and is used for expanding the light; wherein the first lens and the second lens meet the following conditions: 0.86 lt; f1 / f2lt; 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.

Description

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.

[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, a commonly used long-range shooting camera module is a periscopic camera module. A conventional periscopic camera module uses a plane mirror to deflect the light path, and in the case of not increasing the thickness of the mobile phone, it combines with a long-focus lens to achieve a long-range shooting camera module, 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 elements, 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 includes, 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 including a plurality of lenses arranged in order;

[0011] 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<D1 / CT1<13.3; 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.

[0015] In an embodiment of the optical system according to the present application, the second lens satisfies the following condition: 7.1<D2 / CT2<9.8; 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.

[0016] In an embodiment of the optical system according to the present application, the first lens satisfies the following condition: 2.2<f1 / EFL<3.15; 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.

[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<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.

[0018] In an embodiment of the optical system according to the present application, the optical system satisfies the following condition: 0.45<tanFOV<0.55; wherein FOV represents the field of view angle of the optical system; tanFOV represents the tangent value of the field of view angle of the optical system.

[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; where SH represents the total height of the optical system; EPD represents the entrance pupil diameter of the optical system; and 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 and a first image side, where the first object side has a convex surface profile and the first image side has a convex surface profile.

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

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

[0028] According to another aspect of the present application, there is also provided a periscope camera module, which includes:

[0029] A housing; and

[0030] The optical system as described above, and the optical system is installed in the housing.

[0031] Through the understanding of the subsequent description and the drawings, further objects and advantages of the present application will be fully embodied.

[0032] These and other objects, features and advantages of the present application are fully embodied through the following detailed description, drawings and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] By describing the embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features and advantages of the present application will become more obvious. The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation to the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0034] Figure 1 FIG. 1 shows a schematic structural diagram of an optical system according to Embodiment 1 of the present application.

[0035] Figure 2 FIG. 2 shows another schematic structural diagram of an optical system according to Embodiment 1 of the present application.

[0036] Figure 3 FIG. 7 illustrates a distortion curve diagram of the optical system according to Embodiment 1 of the present application.

[0037] Figure 4 FIG. 8 illustrates a chromatic aberration curve diagram of the optical system according to Embodiment 1 of the present application.

[0038] Figure 5 FIG. 9 illustrates a vignetting curve diagram of the optical system according to Embodiment 1 of the present application.

[0039] Figure 6 FIG. 13 illustrates a structure diagram of the optical system according to Embodiment 2 of the present application.

[0040] Figure 7 FIG. 14 illustrates another structure diagram of the optical system according to Embodiment 2 of the present application.

[0041] Figure 8 FIG. 15 illustrates a distortion curve diagram of the optical system according to Embodiment 2 of the present application.

[0042] Figure 9 FIG. 16 illustrates a chromatic aberration curve diagram of the optical system according to Embodiment 2 of the present application.

[0043] Figure 10 FIG. 17 illustrates a vignetting curve diagram of the optical system according to Embodiment 2 of the present application.

[0044] Figure 11 FIG. 21 illustrates a structure diagram of the optical system according to Embodiment 3 of the present application.

[0045] Figure 12 FIG. 22 illustrates another structure diagram of the optical system according to Embodiment 3 of the present application.

[0046] Figure 13 FIG. 23 illustrates a distortion curve diagram of the optical system according to Embodiment 3 of the present application.

[0047] Figure 14 FIG. 24 illustrates a chromatic aberration curve diagram of the optical system according to Embodiment 3 of the present application.

[0048] Figure 15 FIG. 25 illustrates a vignetting curve diagram of the optical system according to Embodiment 3 of the present application.

[0049] Figure 16 FIG. 29 illustrates a structure diagram of the optical system according to Embodiment 4 of the present application.

[0050] Figure 17 FIG. 30 illustrates another structure diagram of the optical system according to Embodiment 4 of the present application.

[0051] Figure 18A distortion curve diagram of the optical system according to Embodiment 4 of the present application is shown.

[0052] Figure 19 A chromatic aberration curve diagram of the optical system according to Embodiment 4 of the present application is shown.

[0053] Figure 20 A distortion curve diagram of the optical system according to Embodiment 4 of the present application is shown.

[0054] Figure 21 A structure diagram of the optical system according to Embodiment 5 of the present application is shown.

[0055] Figure 22 Another structure diagram of the optical system according to Embodiment 5 of the present application is shown.

[0056] Figure 23 A distortion curve diagram of the optical system according to Embodiment 5 of the present application is shown.

[0057] Figure 24 A chromatic aberration curve diagram of the optical system according to Embodiment 5 of the present application is shown.

[0058] Figure 25 A distortion curve diagram of the optical system according to Embodiment 5 of the present application is shown.

[0059] Figure 26 A local light path diagram of the optical system according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0060] 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.

[0061] SUMMARY

[0062] The periscope camera module mainly realizes long focal length shooting through the scheme of turning the light path. The periscope 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.

[0063] Specifically, a common periscope 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 periscope 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 periscope camera module can be installed in the electronic device in a horizontal manner to ensure that the periscope camera module can meet the long focal length shooting effect while reducing the height of the periscope camera module.

[0064] Therefore, the periscopic camera module can change the angle of the incident light, reasonably change the long lens structure, reduce the module height, and to a great extent, realize the requirements of terminal device miniaturization and optical zoom. Here, the periscopic camera module is installed in the electronic device in a horizontal manner, which means that 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, a mobile phone), for example, at an angle of 90 degrees.

[0065] The current periscopic camera module still cannot meet the market requirements well. It should 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 using a large aperture (smaller aperture F value) lens can increase the blurred background of the photo and highlight the main body, and can also improve the shutter speed and focusing speed, and obtain better imaging quality.

[0066] 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.

[0067] 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 prism occupies more space in the periscopic camera module, 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.

[0068] From the perspective of optical design, the present application mainly realizes the large aperture of the periscopic camera module from the aspects of optical path design and optical parameter control, 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.

[0069] In an embodiment of the present application, a light correction element with a non-planar surface type is arranged on the light-incoming side of the reflecting element to adjust the direction of the light rays incident on the reflecting element, to achieve light ray convergence, and to increase the amount of light by the convergence of the light rays, so that the periscopic camera module increases the effective aperture without increasing the height size of the module; a light correction element with a non-planar surface type is also arranged on the light-outgoing side of the reflecting element to adjust the light rays reflected by the reflecting element, to achieve light ray expansion, so that the light rays reflected by the reflecting element are emitted to the lens module in a preset manner.

[0070] Further, the light correction element arranged on the light-incoming side of the reflecting element can be arranged on the reflecting element by an integral molding manner or a molding and then attaching manner. However, it should be understood that when the light correction element is closely attached to the reflecting element (for example, a planar mirror), the surface of the light correction element attached to the planar mirror is planar, and the surface not closely attached to the reflecting element can form a light correction surface; accordingly, the light correction element can only correct the light rays for a single time, which can make the correction effect not obvious.

[0071] Correspondingly, the present application further proposes that the light correction element is arranged to be spaced apart from the reflecting element, so that the surface of the light correction element facing the reflecting element can also be selectively provided with a non-planar surface type, to increase the correction times of the light correction element on the light rays and to improve the correction effect.

[0072] Further, when the reflecting element is implemented as a prism, the light correction elements are arranged on the surface on the light-incoming side and the surface on the light-outgoing side of the prism, which can further increase the size and weight of the reflecting element, and further cause the size and weight of the periscopic camera module to increase.

[0073] 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 planar mirror, a second lens, and a lower group lens set; the first lens has a positive focal power, and is used to converge light rays; the planar mirror is used to reflect the light rays; the second lens has a negative focal power, and is used to expand the light rays; 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.

[0074] After introducing the basic principles of the present application, various non-limiting embodiments of the present application will be specifically introduced below with reference to the accompanying drawings.

[0075] Glossary

[0076] For the convenience of understanding, the technical terms involved in the present application are first explained and described below.

[0077] 1. Optical axis: the direction of the optical system to conduct 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.

[0078] 2. Object side, image side: with the lens as the boundary, the side where the object is located is the object side, and the surface close to the object side of the lens can be called the object side surface; with the lens as the boundary, the side where the image of the object is located is the image side, and the surface close to the image side of the lens can be called the image side surface.

[0079] 3. Focal length: also known as focal length, it is a measure of the optical system to measure the convergence or divergence of light, which refers to the distance from the optical center of the lens or lens group to the focal point when the object at infinity passes through the lens or lens group to form a clear image on the focal plane. It can also 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.

[0080] 4. Aperture: a device used to control the amount of light that enters the lens and reaches the sensor. It is usually located inside the lens. In this application, Fno is used to represent the aperture of the optical system.

[0081] 5. Entrance pupil: the image of the aperture stop formed by the front optical system. The entrance pupil and the exit pupil correspond to each other. The conjugate image of the aperture stop in the object space is called the "entrance pupil". The position and diameter of the entrance pupil represent the position and diameter of the incident light beam.

[0082] 6. Aperture F value: equal to the focal length of the lens divided by the diameter of the entrance pupil. In the case of a constant focal length, the larger the entrance pupil diameter, the larger the aperture, the smaller the aperture F value, the more light enters, the brighter the picture, and the greater the subject background blur; on the contrary, the smaller the entrance pupil diameter, the smaller the aperture, the larger the aperture F value, the less light enters, the darker the picture, and the clearer the subject before and after.

[0083] 7. MTF (Modulation Transfer Function): Modulation Transfer Function, an important indicator of the imaging quality of an optical system.

[0084] 8. Sensitivity: the difference between the MTF design value at a unit angle of oscillation and the MTF design value at rest.

[0085] 9. FOV: the field of view of the optical system.

[0086] 10. SL: the total length of the optical system in the direction of the extension of its set principal optical axis; in the present application, the total length of the optical system in the direction of the extension of its set principal optical axis is equal to the distance between the first lens and the photosurface of the optical system in the direction of the extension of the set principal optical axis of the optical system.

[0087] 11. GH: the shoulder height of the lower group of lenses; in the present application, the shoulder height of the lower group of lenses is determined by the maximum half aperture of the lower group of lenses in the direction of the set height of the optical system.

[0088] 12. D1: the effective diameter of the first lens.

[0089] 13. CT1: the center thickness of the first lens. The center thickness of the first lens is equal to the distance between its object side surface (i.e., the first object side surface) and its image side surface (i.e., the first image side surface) in the direction of the extension of its optical axis.

[0090] 14. D2: the effective diameter of the second lens.

[0091] 15. CT2: the 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 direction of the extension of its optical axis.

[0092] 16. f1: the effective focal length of the first lens.

[0093] 17. f2: the effective focal length of the second lens.

[0094] 18. f12: the effective focal length of the light collecting unit formed by the first lens, the second lens and the plane mirror therebetween.

[0095] 19. OBJ: the object distance at which the optical system can achieve imaging.

[0096] 20. EFL: the effective focal length of the optical system.

[0097] 21. EPD: the entrance pupil diameter of the optical system.

[0098] 22. ImgH: the half image height of the optical system.

[0099] 23. SH: the total height of the optical system.

[0100] Schematic optical system

[0101] As Figures 1 to 25As shown, the optical system 100 according to the embodiment of the present application is illustrated. For the convenience of description, the periscope camera module is defined to extend along a first direction DL1, a second direction DL2 and a third direction DL3 which are perpendicular to each other. The extension of the periscope camera module along the third direction DL3 defines the width of the periscope camera module, the extension of the periscope camera module along the second direction DL2 defines the length of the periscope camera module, and the extension of the periscope camera module along the first direction DL1 defines the height of the periscope camera module. Accordingly, the length direction of the optical system 100 is consistent with the second direction DL2, and the height direction of the optical system 100 is consistent with the first direction DL1.

[0102] 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 the driving burden. Specifically, the present application is from the perspective of optical design, mainly from the perspective of optical element type and optical parameter control to achieve a large aperture, reduce the shoulder height of the lower group lens set, ensure the optical anti-shake performance of the periscope camera module, reduce the weight of the light receiving unit, and reduce the driving burden.

[0103] In terms of optical path, the present application sets optical elements capable of converging light on the light-in side of the reflecting element, increases the amount of light, expands the aperture, so that the optical system 100 benefits from the converging effect of light, 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 reduced; the present application also sets optical elements capable of expanding light on the light-out side of the reflecting element, so that the light is expanded to a certain extent, so that the light tends to be parallel to the main optical axis L1 incident to 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 is parallel to the second direction DL2.

[0104] In terms of optical element type, the present application uses a plane mirror E2A as a reflecting element. Compared with a prism, the weight of the plane mirror E2A is smaller, and even the total weight of the plane mirror E2A, the optical element for converging light and the optical element for expanding may 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.

[0105] In terms of optical parameters, various parameters of each optical element are designed to meet the requirements of aperture, height, length, anti-shake performance and the like.

[0106] Specifically, the optical system 100 comprises, in order from the object side to the image side, a first lens E1, a plane 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 rays. The plane mirror E2A is used for reflecting light rays to change the propagation path of the light rays. The plane mirror E2A is a total reflection plane mirror. The second lens E3 has a negative focal power for diverging light rays. The lower group lens set E20A comprises a plurality of lenses arranged in order.

[0107] A filter E30 and / or a photosensitive chip E40 can be arranged in order on the image side of the lower group lens set E20A. The photosensitive chip E40 has a photosensitive surface E401 for receiving light rays from the lower group lens set E20A. The first lens E1, the plane mirror E2A, the second lens E3, the lower group lens set E20A, and the filter E30 are on the photosensitive path of the photosensitive chip E40. The filter E30 is used for filtering light rays exiting from the lower group lens set E20A. The filter E30 can be an IR filter.

[0108] In an embodiment of the present application, the lower group lens set E20A comprises, 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.

[0109] The first lens E1, the plane mirror E2A, and the second lens E3 form a light collecting unit E10A and are regarded 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 having a positive focal power; the sixth lens E7, the seventh lens E8, and the eighth lens E9 form a movable group lens set E202A having a negative focal 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.

[0110] 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 by a motor (not shown), and the fixed group lens set E201A does not move.

[0111] In other words, in an embodiment of the present application, the optical system 100 comprises a converging lens (i.e., the first lens E1) with positive focal power, a total reflection plane mirror (i.e., the plane mirror E2), a diverging lens (i.e., the second lens E2) with negative focal 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 form a first lens group; the first lens group can be defined as the light receiving unit E10A, and the first lens group is an upper group lens group; the third lens E4, the fourth lens E5 and the fifth lens E6 form a second lens group; the second lens group can be defined as a fixed group lens group E201A; the sixth lens E7, the seventh lens E8 and the eighth lens E9 form a third lens group; the third lens group can be defined as a movable group lens group E202A; the second lens group and the third lens group are a lower group lens group E20A. The diaphragm E50 is arranged between the upper group lens group, i.e., the light receiving unit E10A, and the lower group lens group E20A, and the diaphragm E50 is close to the front end of the lower group lens group E20A.

[0112] It should be understood that the present application does not limit the number of lenses of the E20A, and the related configuration parameters of each lens.

[0113] Since the shoulder height of the lower group lens group E20A of the optical system 100 and the total length of the optical system 100 in the extension direction of the main optical axis L1 set by the optical system 100 have 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 group E20A of the optical system 100 and the total length of the optical system 100 in the extension direction of the main optical axis L1 set by the optical system 100, 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 a prism.

[0114] Correspondingly, the converging lens, the plane mirror and the diverging lens combination of the light receiving unit E10A are used in the present application, 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.

[0115] When external light enters the optical system 100, the light first enters the first lens E1 from the first direction DL1, is condensed 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, enters the second lens E3, 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 reaches the photosensitive chip E40.

[0116] Due to the condensation of the light by the first lens E1, the light is still in a condensed state after being reflected by the plane mirror E2A, even after being expanded by the second lens E3. The aperture of the light when entering the lower group lens set E20A is smaller than the aperture when entering the first lens E1. Thus, the optical effective diameter of the multiple lenses in the lower group lens set E20A is reduced, the height of the lower group lens set E20A is reduced, and the shoulder height of the lower group lens set E20A in the optical system 100 is reduced.

[0117] It can be understood that if the second lens E3 is not provided, the light reaches the plane mirror E2A after being condensed by the first lens E1, and directly reaches the lower group lens set E20A after being reflected by the plane mirror E2A. The light is still in a state of 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 in each direction of the edge are different. Specifically, because all the light converges to the center, but all the light is offset in the same direction when the plane mirror E2A is driven to move for optical image stabilization, the deflection angles of the light in each direction of the edge after passing through the plane mirror E2A are different, the drop value of the MTF of the optical system 100 is large, that is, the anti-shake sensitivity is high. Here, the MTF can be obtained by simulation of the optical system 100. The drop value of the MTF is the difference between the MTF and the static MTF design value per unit angle of jitter, which can also be referred to as the optical image stabilization (OIS) sensitivity.

[0118] In the present application, the second lens E3 is arranged to expand the light rays passing through the second lens E3, so that the light rays exiting the second lens E3 are incident on the lower group lens set E20A in a direction close to parallel to the main optical axis L1. It should be understood that because the light rays have been pre-expanded at the second lens E3, the light rays at each position of the edge propagate in a direction close to parallel to the main optical axis L1, even when the plane mirror E2A is driven to achieve optical image stabilization, the movement of the plane mirror E2A has little effect on the position 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.

[0119] 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 is directed towards the reflecting surface E22 of the plane mirror E2A; the second object side E31 of the second lens E3 is directed towards the reflecting surface E22 of the plane mirror E2A.

[0120] It is worth mentioning that compared with a prism, the plane mirror E2A has a smaller weight, 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 a prism with the same size 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.

[0121] 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.

[0122] 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 E1 towards the plane mirror E2A and the face type design of the second lens E3 towards the plane mirror E2A.

[0123] It should be understood that 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 part of the 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 part of the plane mirror E2A, rather than no contact between the second lens E3 and the plane mirror E2A.

[0124] The present application considers that if the first lens E1 or the second lens E3 can only correct the light once, the correction effect may 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 are both designed as non-planar, and the second object side E31 and the second image side E32 of the second lens E3 are both designed as non-planar, so that the optical system 100 corrects the light multiple times through the first lens E1 and the second lens E3, which can improve the correction effect to a certain extent.

[0125] Accordingly, 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.

[0126] The effective diameter and central 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 embodiment of the present application, the effective diameter and central thickness of the first lens E1 satisfy the following conditions:

[0127] 9.8 < D1 / CT1 < 13.3; wherein, D1 represents an effective diameter of the first lens E1; CT1 represents a center thickness of the first lens E1; D1 / CT1 represents a ratio of D1 to CT1, i.e., a 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 a value obtained by D1 divided by CT1; the ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1 is a value obtained by the effective diameter of the first lens E1 divided by the center thickness of the first lens E1. The center thickness of the first lens E1 is equal to a distance between its object side surface (i.e., the first object side surface E11) and its image side surface (i.e., the first image side surface E12) in an 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.

[0128] When 9.8 < D1 / CT1 < 13.3, 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.

[0129] 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 anti-shake 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:

[0130] 7.1 < D2 / CT2 < 9.8; wherein, D2 represents an effective diameter of the second lens E3; CT2 represents a center thickness of the second lens E3; D2 / CT2 represents a ratio of D2 to CT2, i.e., a 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 a 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 a 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 a 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 an 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.

[0131] When 7.1 < D2 / CT2 < 9.8, the optical system 100 can have a more compact structure under the premise of ensuring the processability of the second lens E3, which is beneficial 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.

[0132] 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:

[0133] 2.2 < f1 / EFL < 3.15; wherein f1 represents the effective focal length of the first lens E1, EFL represents the effective focal length of the optical system 100; f1 / EFL represents the ratio of f1 to EFL, i.e., the ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100, wherein the ratio of f1 to EFL is the resulting value of f1 to EFL; the ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100 is the resulting value of the effective focal length of the first lens E1 to the effective focal length of the optical system 100.

[0134] When 2.2 < f1 / EFL < 3.15, the first lens E1 can have 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.

[0135] 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 condition:

[0136] 0.86 < |f1 / f2| < 1.2; wherein f1 represents the effective focal length of the first lens E1; f2 represents the effective focal length of the second lens E3; f1 / f2 represents the ratio of f1 to f2, i.e., the ratio of the effective focal length of the first lens E1 to the effective focal length of the second lens E3, wherein the ratio of f1 to f2 is the resulting value of f1 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 resulting value 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 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.

[0137] When 0.86<|f1 / f2|<1.2, the optical system 100 can meet the requirements of large aperture and optical image stabilization performance of the periscope 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.

[0138] 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 to 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 during the process of being reflected by the plane mirror E2A to reach the second lens E3, so that the aperture of the light rays reaching the second lens E3 is reduced, which is conducive to reducing the optical effective diameter of the multiple lenses in the lower group lens set E20A, and further helps to reduce the shoulder height of the lower group lens set E20A. The second lens E3 is used to expand the light rays, ensure the optical image stabilization performance of the periscope camera module, and reduce the beam angle of the light rays entering the lower group lens set E20A, so as to ensure the optical image stabilization 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 image stabilization performance of the periscope camera module. In this 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 set E20A. When the light rays expanded by the second lens E3 tend to be parallel to the principal axis L1, the beam angle of the light rays expanded by the second lens E3 tends to be 0.

[0139] Further, in an embodiment of the present application, as shown in Figure 26 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 emission angle b, where b>a, i.e. the light rays are converged in the first lens E1, which helps to reduce the optical effective diameter of the multiple lenses in the lower group lens set E20A and reduce the shoulder height of the lower group lens set 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 emission 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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:

[0145] 9 < f12 / EFL < 23.7; wherein, f12 represents an effective focal length of the light receiving unit E10A; f12 / EFL represents a ratio of f12 to EFL, i.e., a 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 a 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 a value obtained by the effective focal length of the light receiving unit E10A divided by the effective focal length of the optical system 100.

[0146] When 9 < 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 axis L1, which helps to improve the optical anti-shake performance of the periscopic camera module.

[0147] The optical parameters 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, such as optical power, focal length, etc., can be configured according to requirements.

[0148] In the embodiments of the present application, the length of the optical system 100 in the extension direction of the principal axis L1 thereof is defined as the length of the optical system 100. In the embodiments of the present application, the extension direction of the principal 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 axis L1; the height direction of the optical system 100 is perpendicular to the extension direction of the principal axis L1.

[0149] In the 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:

[0150] 1.4 < SL / EFL < 1.5; wherein, SL represents a total length of the optical system 100 in an extension direction of the set principal optical axis L1; EFL represents an effective focal length of the optical system 100; SL / EFL represents a ratio of SL to EFL, i.e., a ratio of the total length of the optical system 100 in the extension direction of the set principal optical axis L1 to the effective focal length of the optical system 100; the ratio of SL to EFL is a value obtained by SL divided by EFL; the ratio of the total length of the optical system 100 in the extension direction of the set principal optical axis L1 to the effective focal length of the optical system 100 is a value obtained by the total length of the optical system 100 in the extension direction of the set principal optical axis L1 divided by the effective focal length of the optical system 100.

[0151] 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 the total length is controlled within a certain range:

[0152] 2.8 < SL / EPD < 3.6; wherein, SL represents a total length of the optical system 100 in an extension direction of the set principal optical axis L1; EPD represents an entrance pupil diameter of the optical system 100; SL / EPD represents a ratio of SL to EPD, i.e., a ratio of the total length of the optical system 100 in the extension direction of the set principal optical axis L1 to the entrance pupil diameter of the optical system 100; the ratio of SL to EPD is a value obtained by SL divided by EPD; the ratio of the total length of the optical system 100 in the extension direction of the set principal optical axis L1 to the entrance pupil diameter of the optical system 100 is a value obtained by the total length of the optical system 100 in the extension direction of the set principal optical axis L1 divided by the entrance pupil diameter of the optical system 100.

[0153] 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 the shoulder height is controlled within a certain range:

[0154] 0.33 < GH / EPD < 0.4; wherein, GH represents a shoulder height of the lower group lens set E20A; EPD represents an entrance pupil diameter of the optical system 100; GH / EPD represents a ratio of GH to EPD, i.e., a 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 a 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 a value obtained by the shoulder height of the lower group lens set E20A divided by the entrance pupil diameter of the optical system 100.

[0155] In the embodiments of the present application, the optical system 100 also satisfies the following conditions, so that the optical system 100 realizes a large aperture while realizing a large image surface:

[0156] 0.35<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 Fno to ImgH, that is, 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 to 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 to the half image height of the optical system 100.

[0157] In the embodiments of the present application, the optical system 100 also satisfies the following conditions, so that the optical system 100 realizes a large aperture while shortening the total height of the optical system 100:

[0158] 0.8<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, that is, 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 to 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 to the entrance pupil diameter of the optical system 100.

[0159] In the embodiments of the present application, the field of view angle of the optical system 100 is small, which is beneficial to imaging of a distant object and ensures the quality of long-distance imaging. Specifically, the field of view angle of the optical system 100 satisfies the following conditions:

[0160] 0.45<tanFOV<0.55; wherein, FOV represents the field of view angle of the optical system 100; tanFOV represents the tangent value of FOV, that is, the tangent value of the field of view angle of the optical system 100.

[0161] In the embodiments of the present application, the optical system 100 also satisfies the following conditions:

[0162] 12cm≤OBJ<INF; wherein, OBJ represents the object distance that the optical system 100 can realize imaging, and INF represents infinity, that is, the optical system 100 can image under the condition that the object distance is greater than or equal to 20 cm.

[0163] 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 periscope camera module, so that the optical system 100 provided by the present application can be applied to electronic devices and smart terminals.

[0164] Correspondingly, the present application also provides a periscope camera module, which comprises a housing and the optical system 100, wherein the optical system 100 is accommodated in the housing.

[0165] The following are five specific embodiments based on the design principles of the optical system 100. Those skilled in the art should understand that the following five specific embodiments are only examples and do not represent that the optical system 100 can only be configured in the following five embodiments. Table 1 shows the conditional expressions of the five embodiments.

[0166] Table 1

[0167]

[0168]

[0169] In each embodiment, the aspherical curve equation of each lens is as follows:

[0170]

[0171] 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 of the aspherical optical axis; Y represents the vertical distance of the point on the aspherical curve to the optical axis; R represents the radius of curvature; k represents the conical coefficient; Ai represents the i-th order aspherical coefficient.

[0172] In the following table, "Sphere" represents a spherical surface; "Qcon Asphere" represents an aspherical surface; "Infinity" represents infinity.

[0173] Embodiment 1

[0174] The following refers to the drawings attached to the specification of the present application Figures 1 to 5 The optical system 100 according to Embodiment 1 of the present application is described. Figure 1 The structural schematic diagram of the optical system 100 according to Embodiment 1 of the present application is shown.

[0175] As Figure 1 and Figure 2As shown, 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.

[0176] 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.

[0177] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is planar. 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.

[0178] 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 towards the image side, has a concave surface shape. The second image side surface E32 of the second lens E3 is at least partially curved towards the object side, has a concave surface shape. 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.

[0179] 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 towards 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 towards the image side, has a convex surface shape. 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] In embodiment 1, EFL = 22.47; Fno = 2.0; FOV = 28.29 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.

[0187] 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 the ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1.

[0188] 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 the ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100.

[0189] 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 the ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3.

[0190] The 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 the 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 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.

[0191] 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=11.6; wherein f12 represents the effective focal length of the light collecting unit E10A; and 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.

[0192] Table 2 shows the specific optical parameters of the various components of Example 1; and Table 3 shows the aspheric coefficients of the various lenses of Example 1.

[0193] Table 2

[0194]

[0195] In Embodiment 1, the optical system 100 satisfies the following conditions: SL / EFL = 1.493; 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 = 2.986; 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. The optical system 100 also satisfies the following conditions: Fno / ImgH = 0.35; 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 = 0.917; 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.

[0196] Table 3

[0197]

[0198] The optical system 100 satisfies the following conditions: tanFOV = 0.538; 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: 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.

[0199] Embodiment 2

[0200] The following refers to the drawings attached to the specification of the present application Figures 6 to 10 The optical system 100 according to Embodiment 2 of the present application is described. Figure 6 A structural schematic diagram of the optical system 100 according to Embodiment 2 of the present application is shown.

[0201] like Figure 6 and Figure 7 As shown, the optical system 100 according to Embodiment 2 of this application 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.

[0202] The first lens E1 has positive optical power. The first lens E1 has a first object-side surface E11 and a first image-side surface E12, wherein the first object-side surface E11 of the first lens E1 is at least partially curved towards the object side, having a convex surface shape, and the first image-side surface E12 of the first lens E1 is curved towards the image side, also having 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.

[0203] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is flat. Light rays emitted 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.

[0204] The second lens E3 has negative optical power. The second lens E3 has a second object-side surface E31 and a second image-side surface E32, wherein at least a portion of the second object-side surface E31 of the second lens E3 is curved towards the image side, having a concave surface shape. At least a portion of the second image-side surface E32 of the second lens E3 is curved towards the object side, having a concave surface shape. Light rays emitted from the reflecting surface E22 of the plane mirror E2A enter the second lens E3 from the second object-side surface E31, are expanded by the second lens E3, and exit from the second image-side surface E32 of the second lens E3.

[0205] The third lens E4 has positive optical power. The third lens E4 has a third object-side surface E41 and a third image-side surface E42, wherein the third object-side surface E41 of the third lens E4 is at least partially curved towards the object side and has a convex surface, and the third image-side surface E42 of the third lens E4 is at least partially curved towards the image side and also has a convex surface. Light rays emitted from the second image-side surface E32 of the second lens E3 pass through the aperture E50, enter the third lens E4 from the third object-side surface E41, and exit from the third image-side surface E42 of the third lens E4.

[0206] 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.

[0207] 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.

[0208] 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.

[0209] 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.

[0210] 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.

[0211] 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.

[0212] 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 the abbreviation of f-number, and FOV represents the field of view angle of the optical system 100.

[0213] 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.

[0214] Table 4

[0215]

[0216] 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.

[0217] 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.

[0218] 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.

[0219] 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.

[0220] Table 5

[0221]

[0222] 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.

[0223] The optical system 100 also satisfies the following conditions: Fno / ImgH=0.411; 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=1.083; 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=0.536; FOV represents the field of view angle of the optical system 100; tanFOV represents the tangent value of FOV, i.e., the tangent value of the field of view angle of the optical system 100. The optical system 100 satisfies the following condition: 12cm≤OBJ<INF; wherein, OBJ represents the object distance at which the optical system 100 can realize imaging; INF represents infinity, i.e., the optical system 100 is capable of imaging under the condition that the object distance is greater than or equal to 12cm.

[0224] Embodiment 3

[0225] The following refers to the drawings attached to the present application specification Figures 11 to 15 An optical system 100 according to Embodiment 3 of the present application is described. Figure 11 A structural schematic diagram of the optical system 100 according to Embodiment 3 of the present application is shown.

[0226] As shown in Figure 11 and Figure 12 The optical system 100 according to Embodiment 3 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.

[0227] 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.

[0228] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is a plane. 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.

[0229] 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.

[0230] The third lens E4 has positive refractive power. The third lens E4 has a third object side E41 and a third image side E42, wherein the third object side E41 of the third lens E4 is at least partially curved towards the object side, has a convex face type, and the third image side E42 of the third lens E4 is at least partially curved towards the image side, has a convex face type. Rays exiting from the second image side E32 of the second lens E3 pass the stop E50, enter the third lens E4 from the third object side E41 of the third lens E4, and exit from the third image side E42 of the third lens E4.

[0231] The fourth lens E5 has negative refractive power. The fourth lens E5 has a fourth object side E51 and a fourth image side E52, wherein the fourth object side E51 of the fourth lens E5 is at least partially curved towards the object side, has a convex face type, and the fourth image side E52 of the fourth lens E5 is at least partially curved towards 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.

[0232] The fifth lens E6 has positive refractive power. The fifth lens E6 has a fifth object side E61 and a fifth image side E62, wherein the fifth object side E61 of the fifth lens E6 is at least partially curved towards the object side, has a convex face type, and the fifth image side E62 of the fifth lens E6 is at least partially curved towards 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.

[0233] The sixth lens E7 has negative refractive power. The sixth lens E7 has a sixth object side E71 and a sixth image side E72, wherein the sixth object side E71 of the sixth lens E7 is at least partially curved towards the image side, has a concave face type, and the sixth image side E72 of the sixth lens E7 is at least partially curved towards 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.

[0234] 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 surface type of concave, the seventh image-side surface 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 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.

[0235] 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 surface type of convex, the eighth image-side surface E92 of the eighth lens E9 is at least partially curved toward the object side, has a surface type of concave. The light rays exiting from the seventh image-side surface E82 of the seventh lens E8 enter the eighth lens E9 from the eighth object-side surface E91 of the eighth lens E9, and exit from the eighth image-side surface E92 of the eighth lens E9.

[0236] 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.

[0237] Table 6 shows the specific optical parameters of the various components of embodiment 3; Table 7 shows the aspheric coefficients of the various lenses of embodiment 3.

[0238] In embodiment 3, EFL = 22.47; Fno = 2.0; FOV = 28.4 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.

[0239] 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; D1 / CT1 represents the ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1.

[0240] 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, 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.

[0241] Table 6

[0242]

[0243] 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; D2 / CT2 represents the ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3.

[0244] The effective focal lengths of the first lens E1 and the second lens E3 satisfy the following condition: |f1 / f2| = 0.869; 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.

[0245] 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; 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.

[0246] 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 thereof; 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 thereof 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 thereof; 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 thereof 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.

[0247] Table 7

[0248]

[0249] The optical system 100 also satisfies the following conditions: 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; 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 = 0.952; 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 = 0.536; 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: 12 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 12 cm.

[0250] Embodiment 4

[0251] Reference is made below to the drawings accompanying the present application specification Figures 16 to 20 An optical system 100 according to Embodiment 4 of the present application is described. Figure 16 A structural schematic diagram of the optical system 100 according to Embodiment 4 of the present application is shown.

[0252] As shown in FIG. 4, 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, 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. Figure 16 Figure 17 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.

[0253] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is a plane. 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.

[0254] 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.

[0255] 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 stop 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.

[0256] The fourth lens E5 has positive refractive 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, has a convex surface shape, and the fourth image side surface E52 of the fourth lens E5 is at least partially curved toward the image side, has a convex surface shape. 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, are expanded by the fourth lens E5, and exit from the fourth image side surface E52 of the fourth lens E5. ​

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] 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. 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.

[0262] 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.

[0263] In embodiment 4, EFL = 26.44; Fno = 2.4; FOV = 24.24 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.

[0264] Table 8 shows the specific optical parameters of various components of embodiment 4; and Table 9 shows the aspheric coefficients of various lenses of embodiment 4.

[0265] The effective diameter and the center thickness of the first lens E1 satisfy the following condition: D1 / CT1 = 11.893; wherein D1 represents the effective diameter of the first lens E1; CT1 represents the center thickness of the first lens E1; and D1 / CT1 represents the ratio of the effective diameter of the first lens E1 to the center thickness of the first lens E1.

[0266] The effective focal length of the first lens E1 satisfies the following condition: f1 / EFL = 3.149; 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.

[0267] The effective diameter and the center thickness of the second lens E3 satisfy the following condition: D2 / CT2 = 7.145; wherein D2 represents the effective diameter of the second lens E3; CT2 represents the center thickness of the second lens E3; and D2 / CT2 represents the ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3.

[0268] The effective focal length of the first lens E1 and the second lens E3 satisfies 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 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.

[0269] 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=16.955; 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.

[0270] Table 8

[0271]

[0272] In Embodiment 4, the optical system 100 satisfies the following conditions: SL / EFL=1.502; 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=3.603; 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=0.356; 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.

[0273] Table 9

[0274]

[0275] The optical system 100 also satisfies the following conditions: Fno / ImgH = 0.42; where Fno represents the aperture of the optical system 100, ImgH represents the semi-image height of the optical system 100, and Fno / ImgH represents the ratio of the aperture of the optical system 100 to the semi-image height of the optical system 100. SH / EPD = 0.944; 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 = 0.45; FOV represents the field angle of the optical system 100, and tanFOV represents the tangent value of FOV, that is, the tangent value of the field angle 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, that is, the optical system 100 can image under the condition that the object distance is greater than or equal to 12 cm.

[0276] Embodiment 5

[0277] The following refers to the accompanying drawings of the specification of the present application Figures 21 to 25 to describe the optical system 100 according to Embodiment 5 of the present application. Figure 21 FIG. shows a schematic structural diagram of the optical system 100 according to Embodiment 5 of the present application.

[0278] As Figure 21 and Figure 22 shown, the optical system 100 according to Embodiment 5 of the present application sequentially includes a first lens E1, a plane mirror E2A, a second lens E3, an aperture E50, a third lens E4, a fourth lens E5, a fifth lens E6, a sixth lens E7, a seventh lens E8, an eighth lens E9, a filter E30, and a photosensitive chip E40 from the object side to the image side.

[0279] The first lens E1 has a positive optical power. The first lens E1 has a first object side surface E11 and a first image side surface E12. Among them, the first object side surface E11 of the first lens E1 is at least partially curved toward the object side and has a convex surface shape, and the first image side surface E12 of the first lens E1 is curved toward the image side and has a convex surface shape. The light incident on the first object side surface E11 of the first lens E1 along the first direction DL1 is converged by the first lens E1 and exits through the first image side surface E12 of the first lens E1.

[0280] The plane mirror E2A has a reflecting surface E22. The reflecting surface E22 of the plane mirror E2A is a plane. 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.

[0281] The second lens E3 has a negative optical 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 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, having a surface shape 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.

[0282] The third lens E4 has a positive optical 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 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, having a surface shape of a convex surface. The light rays exiting from the second image side surface E32 of the second lens E3 pass through the diaphragm E50, enter the third lens E4 from the third object side surface E41 of the third lens E4, and exit from the third image side surface E42 of the third lens E4.

[0283] The fourth lens E5 has a negative optical 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 shape 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 shape of a concave surface. The light rays exiting from the third image side surface E42 of the third lens E4 enter the fourth lens E5 from the fourth object side surface E51 of the fourth lens E5, and exit from the fourth image side surface E52 of the fourth lens E5.

[0284] The fifth lens E6 has positive refractive power. The fifth lens E6 has a fifth object side E61 and a fifth image side E62, wherein the fifth object side E61 of the fifth lens E6 is curved at least in part towards the object side, has a convex face shape, the fifth image side E62 of the fifth lens E6 is curved at least in part towards the image side, has a convex face shape. 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.

[0285] The sixth lens E7 has negative refractive power. The sixth lens E7 has a sixth object side E71 and a sixth image side E72, wherein the sixth object side E71 of the sixth lens E7 is curved at least in part towards the image side, has a concave face shape, the sixth image side E72 of the sixth lens E7 is curved at least in part towards the image side, has a convex face shape. 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.

[0286] The seventh lens E8 has positive refractive power. The seventh lens E8 has a seventh object side E81 and a seventh image side E82, wherein the seventh object side E81 of the seventh lens E8 is curved at least in part towards the object side, has a convex face shape, the seventh image side E82 of the seventh lens E8 is curved at least in part towards the image side, has a convex face shape. 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.

[0287] 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 face shape, the eighth image side E92 of the eighth lens E9 is curved at least in part towards the object side, has a concave face 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.

[0288] 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.

[0289] In embodiment 5, EFL = 25.09; Fno = 2.0; FOV = 25.46 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.

[0290] Table 10 shows specific optical parameters of various components of embodiment 5; and Table 11 shows aspherical coefficients of various lenses of embodiment 5.

[0291] The effective diameter and the center 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 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.

[0292] Table 10

[0293]

[0294] 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, 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.

[0295] 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; and D2 / CT2 represents a ratio of the effective diameter of the second lens E3 to the center thickness of the second lens E3.

[0296] Table 11

[0297]

[0298] An effective focal length of the first lens E1 and the second lens E3 satisfies 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 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.

[0299] 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=9.075; wherein 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.

[0300] In embodiment 5, the optical system 100 satisfies the following conditions: SL / EFL = 1.444; 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 = 2.888; 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 = 0.338; 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. The optical system 100 also satisfies the following conditions: Fno / ImgH = 0.35; 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 = 0.87; 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 = 0.476; 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: 12cm ≤ OBJ < INF; wherein, OBJ represents the object distance that 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 12cm.

[0301] 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 achieve a large aperture, reduce the shoulder height and ensure the optical image stabilization performance of the periscopic camera module.

[0302] It should be understood by those skilled in the art that the embodiments of the present application described above and shown in the drawings are only examples and do not limit the present application. The purpose of the present application has been fully and effectively achieved. The function and structural principle of the present application has been demonstrated and explained in the embodiments, and the embodiments of the present application can be modified or changed without departing from the principles.

Claims

1. An optical system characterized by comprising: From the object side to the image side in order 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 conditions: 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; |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: 9.8<D1 / CT1<13.3; 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<9.8; 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: 2.2<f1 / EFL<3.15; 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: 9<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: 0.45<tanFOV<0.55; 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: 1.4<SL / EFL<1.5; 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 conditions: 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 conditions: 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.

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 conditions: 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.

12. The optical system of claim 1, wherein, The optical system satisfies the following conditions: 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: comprising: a housing; and The optical system as claimed in any one of claims 1 to 15 is installed in the housing. ​

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