Zoom lens, camera module and mobile terminal

Abstract

The present application provides a zoom lens, a camera module, and a mobile terminal. The zoom lens includes a first lens group and a second lens group arranged from the object side to the image side: the first lens group is fixed, and the second lens group is slidable along the optical axis; wherein the first lens group has positive focal power; and the second lens group has negative focal power; wherein the ratio of the focal length EFLG1 of the first lens group to the focal length EFLG2 of the second lens group satisfies: 0.4<|EFLG1 / EFLG2|<1.22; and the ratio of the focal length EFLG2 of the second lens group to the focal length EFL of the optical lens satisfies: 0.4<|EFLG2 / EFL|<1. In the above technical solution, by adopting a technical solution combining two lens groups, it can be applicable to shooting scenes at long distances and macro distances, and compared with existing lenses compatible with long distances and macro distances, it meets the requirements of miniaturization, and achieves higher resolution and better aberration control.

Description

Technical Field

[0001] The present application relates to the field of camera technology, and in particular to a zoom lens, a camera module and a mobile terminal. Background Art

[0002] Currently, cameras are widely used in portable devices such as mobile phones and tablets as one of the important means of acquiring information. At the same time, as people's requirements for camera shooting scenes become more diverse and complex, cameras need to achieve high-quality shooting effects in different scenes at the same time. Among them, among photographic lenses, telephoto lenses (with longer focal lengths) can shoot distant objects, providing high magnification while ensuring good image quality. However, when users use telephoto lenses to shoot close-up macro scenes, such as shooting food, books, dolls, and insects, the current commercial telephoto camera lenses have poor capabilities and cannot meet users' shooting requirements. Correspondingly, macro lenses can demonstrate extremely strong capabilities in shooting close-up macro scenes, but the quality of images taken in long-distance scenes has always been poor.

[0003] In order to achieve the effects of shooting at long distances and close-up macro shots, small portable devices such as mobile phones and tablets need to have a larger space to accommodate cameras. However, due to the size of current small portable devices such as mobile phones and tablets, the camera assembly space is relatively small, and the assembled lenses cannot take into account both long-range and macro shots. Summary of the Invention

[0004] The present application provides a zoom lens, a camera module and a mobile terminal for improving the shooting effect of the mobile terminal.

[0005] In a first aspect, a zoom lens is provided, comprising a first lens group and a second lens group arranged from the object side to the image side: the first lens group is fixed, and the second lens group is slidable along the optical axis; wherein the first lens group has positive focal power; and the second lens group has negative focal power; wherein the ratio of the focal length EFLG1 of the first lens group to the focal length EFLG2 of the second lens group satisfies: 0.4<|EFLG1 / EFLG2|<1.22; and the ratio of the focal length EFLG2 of the second lens group to the focal length EFL of the optical lens satisfies: 0.4<|EFLG2 / EFL|<1. In the above technical solution, by adopting a technical solution combining two lens groups, it can be applicable to shooting scenes at telephoto and macro distances, and compared with existing lenses compatible with telephoto and macro distances, it meets the requirements of miniaturization, and achieves higher resolution and better aberration control.

[0006] In a specific feasible implementation, the first lens group includes at least one lens, and the lens closest to the object side in the first lens group has a positive optical power. This ensures that the zoom lens has a good imaging effect.

[0007] In a specific feasible implementation, the lens closest to the object side in the first lens group is a lens made of optical glass. This ensures that the zoom lens has a good imaging effect.

[0008] In a specific feasible implementation, the first lens group includes a first lens and a second lens arranged from the object side to the image side; the second lens has a negative optical power. This ensures that the zoom lens has a good imaging effect.

[0009] In a specific feasible implementation, during the process of the zoom lens changing from the telephoto state to the macro state, the second lens group moves from the object side to the image side, and the ratio of the moving stroke △ of the second lens group to the total optical length TTL of the zoom lens satisfies △ / TTL < 0.4. This ensures that the zoom lens can meet the requirements of telephoto and macro shooting in a smaller size.

[0010] In a specific feasible implementation, the moving stroke △ of the second lens group < 4 mm. This ensures the miniaturization of the zoom lens.

[0011] In a specific feasible implementation, the second lens group includes at least one lens; among them, the surface of the lens closest to the object side in the second lens group facing the image side is a concave surface. This ensures that the zoom lens has a good imaging effect.

[0012] In a specific feasible implementation, the aperture of the zoom lens satisfies 2.8 > F#. This ensures that enough light can enter the zoom lens to guarantee the imaging effect.

[0013] In a specific feasible implementation, in the telephoto state, the second lens group moves to the object side, and the focusing distance ODt of the zoom lens satisfies: 1 m < ODt < ∞. This provides a good telephoto shooting effect.

[0014] In a specific feasible implementation, in the macro state, the second lens group moves to the image side, and the focusing distance Odm of the zoom lens satisfies: 0.03 m < Odm < 0.2 m. This provides a good macro shooting effect.

[0015] In a specific feasible implementation, the macro vertical magnification of the zoom lens is 0.3 < β < 0.7.

[0016] In a specific feasible implementation, it further includes a prism or a mirror, where,

[0017] The prism or reflector is located on the object side of the first lens group;

[0018] The prism or reflector is used to reflect light to the first lens group.

[0019] In a second aspect, a zoom lens is provided, comprising a first lens group and a second lens group arranged from the object side to the image side: the second lens group is fixed, and the first lens group is slidable along the optical axis; wherein the first lens group has positive focal power; and the second lens group has negative focal power; wherein the ratio of the focal length EFLG1 of the first lens group to the focal length EFLG2 of the second lens group satisfies: 0.4<|EFLG1 / EFLG2|<1.22; and the ratio of the focal length EFLG2 of the second lens group to the focal length EFL of the optical lens satisfies: 0.4<|EFLG2 / EFL|<1. In the above technical solution, by adopting a technical solution combining two lens groups, it can be applicable to shooting scenes at telephoto and macro distances, and compared with existing lenses compatible with telephoto and macro distances, it meets the requirements of miniaturization, and achieves higher resolution and better aberration control.

[0020] In a specific embodiment, the first lens group includes at least one lens, and the lens closest to the object side in the first lens group has positive optical power, thereby ensuring that the zoom lens has a good imaging effect.

[0021] In a specific embodiment, the lens closest to the object side in the first lens group is made of optical glass, so as to ensure that the zoom lens has a good imaging effect.

[0022] In a specific embodiment, the first lens group includes a first lens and a second lens arranged from the object side to the image side; the second lens has a negative optical power, thereby ensuring that the zoom lens has a better imaging effect.

[0023] In one specific embodiment, when the zoom lens moves from a telephoto state to a macro state, the second lens group moves from the object side to the image side, and a ratio of a travel distance Δ of the second lens group to the total optical length TTL of the zoom lens satisfies Δ / TTL<0.4. This ensures that the zoom lens can meet both telephoto and macro photography requirements while maintaining a compact size.

[0024] In a specific implementation manner, the movement stroke Δ of the second lens group is less than 4 mm, thereby ensuring miniaturization of the zoom lens.

[0025] In a specific feasible implementation, the second lens group includes at least one lens; wherein, the surface of the lens closest to the object side in the second lens group facing the image side is a concave surface, ensuring that the zoom lens has a good imaging effect.

[0026] In a specific feasible implementation, the aperture of the zoom lens satisfies 2.8 > F# to ensure that sufficient light can enter the zoom lens and ensure the imaging effect.

[0027] In a specific feasible implementation, in the telephoto state, the second lens group moves to the object side, and the focusing distance ODt of the zoom lens satisfies: 1m < ODt < ∞, providing a good telephoto shooting effect.

[0028] In a specific feasible implementation, in the macro state, the second lens group moves to the image side, and the focusing distance Odm of the zoom lens satisfies: 0.03m < Odm < 0.2m, providing a good macro shooting effect.

[0029] In a specific feasible implementation, the macro vertical magnification ratio of the zoom lens is 0.3 < β < 0.7.

[0030] In a third aspect, a camera module is provided. The camera module includes a photosensitive element and the zoom lens according to any one of the above. The photosensitive element is located on the image side of the zoom lens. The zoom lens is used to receive the light reflected by the photographed object and project it onto the photosensitive element, and the photosensitive element is used to convert the light into an image signal. In the above technical solution, by adopting the technical solution of combining two lens groups, it can be applicable to shooting scenarios at telephoto and macro distances. Compared with the existing lenses compatible with telephoto and macro, it can meet the miniaturization requirement and achieve a high resolution and better aberration control.

[0031] In a fourth aspect, a mobile terminal is provided. The mobile terminal includes a housing and the zoom lens according to any one of the above provided in the housing. In the above technical solution, by adopting the technical solution of combining two lens groups, it can be applicable to shooting scenarios at telephoto and macro distances. Compared with the existing lenses compatible with telephoto and macro, it can meet the miniaturization requirement and achieve a high resolution and better aberration control. Description of the Drawings

[0032] Figure 1 It is a schematic diagram of the application of a zoom lens in the prior art;

[0033] Figure 2 It is a schematic diagram of the structure of the zoom lens provided by the embodiment of the present application;

[0034] Figure 3A schematic diagram of zooming of the zoom lens provided in an embodiment of the present application;

[0035] Figure 4 A schematic structural diagram of a first zoom lens provided in an embodiment of the present application;

[0036] Figure 5 A diagram of spherical chromatic aberration of the first zoom lens provided in an embodiment of the present application at a telephoto position;

[0037] Figure 6 Astigmatism diagram of the first zoom lens provided in the embodiment of the present application at a telephoto position;

[0038] Figure 7 This is a distortion diagram of the first zoom lens provided in an embodiment of the present application at a long distance;

[0039] Figure 8 This is a diagram of spherical chromatic aberration of the first zoom lens provided in the embodiment of the present application in the macro state;

[0040] Figure 9 This is an astigmatism diagram of the first zoom lens provided in the embodiment of the present application in the macro state;

[0041] Figure 10 This is a distortion diagram of the first zoom lens provided in the embodiment of the present application in the macro state;

[0042] Figure 11 A schematic structural diagram of a second zoom lens provided in an embodiment of the present application;

[0043] Figure 12 A diagram of spherical chromatic aberration of the second zoom lens provided in an embodiment of the present application at a telephoto position;

[0044] Figure 13 This is an astigmatism diagram of the second zoom lens provided in an embodiment of the present application at a telephoto position;

[0045] Figure 14 This is a distortion diagram of the second zoom lens provided in an embodiment of the present application at a long distance;

[0046] Figure 15 This is a diagram of spherical chromatic aberration of the second zoom lens provided in an embodiment of the present application in macro mode;

[0047] Figure 16 This is an astigmatism diagram of the second zoom lens provided in the embodiment of the present application in the macro state;

[0048] Figure 17 This is a distortion diagram of the second zoom lens provided in the embodiment of the present application in macro mode;

[0049] Figure 18A schematic structural diagram of a third zoom lens provided in an embodiment of the present application;

[0050] Figure 19 A diagram of spherical chromatic aberration of the third zoom lens provided in an embodiment of the present application at a telephoto position;

[0051] Figure 20 This is an astigmatism diagram of the third zoom lens provided in an embodiment of the present application at a telephoto position;

[0052] Figure 21 This is a distortion diagram of the third zoom lens provided in an embodiment of the present application at a long distance;

[0053] Figure 22 This is a diagram of spherical chromatic aberration of the third zoom lens provided in an embodiment of the present application in macro mode;

[0054] Figure 23 This is an astigmatism diagram of the third zoom lens provided in the embodiment of the present application in the macro state;

[0055] Figure 24 This is a distortion diagram of the third zoom lens provided in an embodiment of the present application in macro mode;

[0056] Figure 25 A schematic structural diagram of a fourth zoom lens provided in an embodiment of the present application;

[0057] Figure 26 A diagram of spherical chromatic aberration of the fourth zoom lens provided in an embodiment of the present application at a telephoto position;

[0058] Figure 27 Astigmatism diagram of the fourth zoom lens provided in the embodiment of the present application at a telephoto position;

[0059] Figure 28 This is a distortion diagram of the fourth zoom lens provided in an embodiment of the present application at a telephoto position;

[0060] Figure 29 This is a diagram of spherical chromatic aberration of the fourth zoom lens provided in an embodiment of the present application in macro mode;

[0061] Figure 30 This is an astigmatism diagram of the fourth zoom lens provided in the embodiment of the present application in the macro state;

[0062] Figure 31 This is a distortion diagram of the fourth zoom lens provided in an embodiment of the present application in macro mode;

[0063] Figure 32 A schematic structural diagram of a fifth zoom lens provided in an embodiment of the present application;

[0064] Figure 33A diagram of spherical chromatic aberration of the fifth zoom lens provided in an embodiment of the present application at a telephoto position;

[0065] Figure 34 This is an astigmatism diagram of the fifth zoom lens provided in an embodiment of the present application at a telephoto position;

[0066] Figure 35 This is a distortion diagram of the fifth zoom lens provided in an embodiment of the present application at a telephoto position;

[0067] Figure 36 This is a diagram of spherical chromatic aberration of the fifth zoom lens in macro mode provided by an embodiment of the present application;

[0068] Figure 37 This is an astigmatism diagram of the fifth zoom lens provided in the embodiment of the present application in the macro state;

[0069] Figure 38 This is a distortion diagram of the fifth zoom lens provided in the embodiment of the present application in the macro state;

[0070] Figure 39 A schematic structural diagram of a sixth zoom lens provided in an embodiment of the present application is shown;

[0071] Figure 40 A schematic diagram of an application scenario of the zoom lens provided in an embodiment of the present application in a mobile phone is shown. DETAILED DESCRIPTION

[0072] Glossary:

[0073] F#, F-number. F-number / aperture is a relative value calculated by dividing the focal length of the lens by the diameter of the lens (the inverse of the relative aperture). The smaller the aperture F-number, the more light enters the lens in the same unit of time. The larger the aperture F-number, the smaller the depth of field, and the background content in the photo will be blurred, similar to the effect of a telephoto lens.

[0074] β, Horizontal Magnification, vertical axis magnification;

[0075] EFL, Effective Focal Length, effective focal length;

[0076] TTL, Total Track Length, refers to the distance from the first surface of the lens to the image plane, also known as the total optical length.

[0077] IH, Image Height, the radius of the imaging circle, half image height;

[0078] CCD, Charge-coupled device;

[0079] CMOS, Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor;

[0080] OD, Objectistance, the distance from the object to the optical center of the lens, can be approximately expressed by the distance from the object to the front surface of the first lens;

[0081] Lens Group, a lens group, is a lens combination consisting of several relatively fixed lenses;

[0082] Positive power: the lens or lens group has a positive focal length and has the effect of converging light;

[0083] Negative optical power, a lens or lens group has a negative focal length, diverging the light.

[0084] Focus distance: the distance from the object to the vertex of the first lens element of the lens;

[0085] Object plane: the plane where the imaged object is located;

[0086] Image plane: the plane where the image of an object is formed;

[0087] Aperture: An entity that constrains light in an optical system;

[0088] Object side: The side of the zoom lens closest to the object being imaged is the object side;

[0089] Image side: The side of the image formed by the zoom lens close to the object is the image side;

[0090] Movement stroke: the distance the lens group moves when the zoom lens moves from the telephoto state to the macro state.

[0091] To facilitate understanding of the zoom lens provided in the embodiment of the present application, the application scenarios of the zoom lens provided in the embodiment of the present application are first explained. The zoom lens provided in the embodiment of the present application is applied to the camera module of a mobile terminal, and the mobile terminal can be a mobile phone, tablet, monitoring, vehicle-mounted and other portable terminal devices. The zoom lens can be used to shoot and record images, and its shooting scenes include various complex and diverse shooting application scenes, such as indoor, outdoor, people, environment and other different scenes. Taking a mobile phone as an example, Figure 1 In the cross-sectional view of the mobile phone shown, the lens 201 of the camera module 200 is fixed to the housing 100 of the mobile terminal, and the photosensitive element 202 is fixed within the housing 100. During use, light passes through the lens 201 and illuminates the photosensitive element 202, which converts the light signal into an electrical signal and forms an image, achieving the effect of taking a photo. The camera module 200 in the prior art cannot take into account both long-range and micro-focus shooting modes. To this end, the present invention provides a zoom lens.

[0092] Reference Figure 2 , an embodiment of the present application provides a zoom lens, which includes a first lens group G1 and a second lens group G2 arranged from the object side to the image side. In addition, an aperture 30 can be provided in the zoom lens, and the aperture 30 is located on the side of the first lens group G1 close to the object side to restrict the light rays entering the first lens group G1.

[0093] The first lens group G1 has 1 to 3 lenses and has a positive optical power; the first lens of the first lens group G1 has a positive optical power. The second lens group G2 has 1 to 2 lenses and has a negative optical power. The first lens group G1 and the second lens group G2 can slide relative to each other along the optical axis, and the zoom lens achieves focusing by moving the first lens group G1 or the second lens group G2 along the optical axis direction. Exemplarily, either the second lens group G1 can be fixed and the first lens group G1 slides along the optical axis to achieve focusing, or the first lens group G1 can be fixed and the second lens group G2 slides along the optical axis to achieve focusing. As Figure 3 shown, Figure 3 an example of the second lens group G2 sliding relative to the first lens group G1 is given. During focusing, the second lens group G2 can move back and forth along the optical axis to achieve focusing of the zoom lens.

[0094] To achieve different shooting scenarios, the zoom lens has a telephoto state and a macro state. When the zoom lens is in the telephoto state, the second lens group G2 is close to the object side, and at this time, the zoom lens can shoot objects farther from the zoom lens. When the zoom lens is in the macro state, the second lens group G2 is close to the image side, and at this time, the zoom lens can shoot objects closer to the zoom lens.

[0095] When setting the first lens group G1 and the second lens group G2, the focal length EFLG1 of the first lens group G1 and the focal length EFLG2 of the second lens group G2 satisfy the following conditions: the ratio of the focal length EFLG1 of the first lens group to the focal length EFLG of the second lens group satisfies: 0.4 < |EFLG1 / EFLG2| < 1.22; the ratio of the focal length EFLG2 of the second lens group to the focal length EFL of the optical lens satisfies: 0.4 < |EFLG2 / EFL| < 1. Thus, the zoom lens can meet different shooting scenarios such as telephoto and macro. Exemplarily, in the telephoto state, the second lens group G2 is close to the object side, and the focusing distance ODt of the zoom lens satisfies: 1m < ODt < ∞; in the macro state, the second lens group G2 is close to the image side, and the focusing distance Odm of the zoom lens satisfies: 0.03m < Odm < 0.2m.

[0096] When configuring the first lens group G1, the first lens group G1 may include at least one lens; the first lens closest to the object side is made of optical glass and has positive optical power. Exemplarily, the first lens group G1 includes a first lens and a second lens arranged from the object side to the image side; the first lens has positive optical power, and the second lens has negative optical power. When configuring the second lens group G2, the second lens group G2 includes at least one lens; wherein the surface of the lens closest to the object side in the second lens group G2 facing the image side is concave. It should be understood that the lenses in the first lens group G1 and the second lens group G2 may be spherical or aspherical.

[0097] When the zoom lens moves from the telephoto mode to the macro mode, the second lens group G2 moves from the object side to the image side, and the ratio of the second lens group's travel distance Δ to the zoom lens's total optical length TTL satisfies Δ / TTL < 0.4. For example, the second lens group's travel distance Δ is < 4 mm, and the travel distance Δ can be, for example, 1 mm, 2 mm, 3 mm, or 4 mm.

[0098] In addition, the aperture of the zoom lens provided in the embodiment of the present application satisfies 2.8>F#, ensuring that sufficient light can enter the zoom lens and maintain the imaging effect. The macro vertical axis magnification of the zoom lens is 0.3<β<0.7.

[0099] refer to Figure 4 , Figure 4 The diagram shows the structure of the first zoom lens provided by an embodiment of the present application. From left to right (object side to image side), the zoom lens includes a first lens group G1 and a second lens group G2, arranged in sequence. The first lens group G1 comprises two lenses: a first lens LG11 and a second lens LG12, from the object side to the image side; the second lens group G2 comprises two lenses: a third lens LG21 and a fourth lens LG22, from the object side to the image side. This embodiment utilizes the second lens group G2 to focus along the optical axis, making it suitable for both macro and telephoto shooting scenarios.

[0100] As an optional solution, the zoom lens may further include a filter 10. For example, from the object side to the image side, behind the second lens group G2 is a filter for correcting color deviation or a flat glass L1 for protecting the imaging photosensitive element. The imaging sensor 20 is located at the image plane and can be a CCD or a CMOS.

[0101] The zoom lens provided in this embodiment has a first lens group G1 with positive refractive power, and a second lens group G2 with negative refractive power. For example, the focal length EFLG1 of the first lens group G1 is 8.15 mm, and the focal length EFLG2 of the second lens group G2 is -12.45 mm. The ratio of the focal length EFLG1 of the first lens group G1 to the focal length EFLG2 of the second lens group G2 is |EFLG1 / EFLG2|=0.65; and the ratio of the focal length EFL of the second lens G2 to the focal length EFLG1 of the zoom lens is |EFLG2 / EFL|=0.86.

[0102] The first lens group G1 includes two lenses, namely a first lens LG11 and a second lens LG12. The first lens LG11 has a positive optical power, and the second lens LG12 has a negative optical power. In addition, the material of the first lens LG11 is optical glass, specifically an optical glass convex lens; the second lens LG12 is optical glass or optical plastic. The second lens group G2 includes two lenses, namely a third lens LG21 and a fourth lens LG22. The third lens LG21 and the fourth lens LG22 can have either positive or negative optical power, which is not specifically limited here. The material of the third lens LG21 and the fourth lens LG22 can be optical glass or optical plastic, which is not specifically limited in this application.

[0103] The zoom lens has a focal length of 14.45mm, an aperture of F# = 3.42, an optical length TTL of 14.94mm, and a half-image height (IH) of 2.5mm. The vertical magnification β in macro mode is 0.3.

[0104] When the zoom lens is shifted from telephoto to macro, the second lens group G2 has a travel distance Δ of 2.4 mm, and the ratio of the travel distance Δ to the total optical length is Δ / TTL = 0.16. To facilitate understanding of the zoom lens provided in the embodiments of the present application, the following detailed description of the parameters of each lens and the zoom lens is provided in conjunction with a table.

[0105] The following first explains the meaning of the numbers in the table below: LG11S1 refers to the object-facing side of the first lens element LG11, and LG11S2 refers to the image-facing side of the first lens element LG11; LG12S1 refers to the object-facing side of the second lens element LG12, and LG12S2 refers to the image-facing side of the second lens element LG12; LG21S1 refers to the object-facing side of the third lens element LG21, and LG21S2 refers to the image-facing side of the third lens element LG21; LG22S1 refers to the object-facing side of the fourth lens element LG22, and LG22S2 refers to the image-facing side of the fourth lens element LG22.

[0106] First, refer to Table 1a, which shows the aspheric coefficients of various aspheric lenses; wherein A4 to A30 are aspheric coefficients.

[0107] Table 1a

[0108]

[0109]

[0110] In this embodiment, all aspheric surface shapes can be defined using, but not limited to, the following aspheric surface formula:

[0111]

[0112] Wherein, z is the aspheric height, r is the radial coordinate of the aspheric surface, c is the aspheric vertex curvature, K is the quadratic surface constant, and A2, A4, ..., A30 are aspheric coefficients.

[0113] Refer to Table 1b, which lists the basic parameters of the zoom lens at telephoto. Here, R is the radius of curvature, Th is the surface thickness, Nd is the material refractive index, Vd is the material Abbe number, SA (Semi-Aperture) is the radial aperture, Conic is the cone coefficient, inf represents infinity, Object is the object surface, Stop is the aperture 30°, Sphere is the spherical surface, Asphere is the aspherical surface, and Image is the image surface. L1S1 refers to the object-facing side of the flat glass L1, and L1S2 refers to the image-facing side of the flat glass L1. The same English terms in the following tables refer to the above explanations and are not repeated here.

[0114] Table 1b

[0115]

[0116]

[0117] Refer to Table 1c, which shows the basic parameters of the zoom lens in macro mode. Here, R is the radius of curvature, Th is the surface thickness, Nd is the material refractive index, Vd is the material Abbe number, SA (Semi-Aperture) is the radial aperture, Conic is the conic coefficient, and inf represents infinity. The same English terms in the table below refer to the above explanations and are not repeated here.

[0118] Table 1c

[0119]

[0120] Refer to Table 1d, which lists the parameters of the zoom lens. When the lenses in the first lens group G1 and the second lens group G2 adopt the above parameters, the corresponding zoom lens parameters are shown in Table 1d. Here, macro magnification β is the vertical magnification of the zoom lens in macro mode; infinity F# is the aperture number of the zoom lens in telephoto mode; EFLG1 is the focal length of the first lens group G1, EFLG2 is the focal length of the second lens group G2; infinity EFL is the focal length of the zoom lens in telephoto mode; Δ / TTL represents the ratio of the zoom travel to the optical length. The same English terms in the following tables refer to the above explanations and are not repeated here.

[0121] Table 1d

[0122] Macro magnification β 0.30 Infinity F# 3.42 EFLG1 8.15 EFLG2 -12.45 Infinity EFL 14.45 |EFLG1 / EFLG2| 0.65 |EFLG2 / EFL| 0.86 △ 2.40 Optical total length TTL 14.94 △ / TTL 0.16

[0123] To facilitate understanding of the shooting effect provided by the embodiment of the present application, Figure 4 The zoom lens shown in FIG. 1 is used as an example for simulation. The specific parameters of the zoom lens can be found in Table 1a, Table 1b, Table 1c, and Table 1d. The following details the effects of the zoom lens in simulation with reference to the accompanying drawings.

[0124] First reference Figure 5 , Figure 5 The spherical chromatic aberration diagram of the zoom lens at a long distance is shown in FIG. For the convenience of illustration, light of different frequencies is used as an example for simulation. Figure 5 Several frequencies of light commonly used in imaging are exemplified in FIG. Figure 5 The five solid curves in the figure are the wavelengths of 650nm, 587nm, 546nm, 486nm and 435nm. Figure 5 A represents the light with a wavelength of 650nm, B represents the light with a wavelength of 587nm, C represents the light with a wavelength of 546nm, E represents the light with a wavelength of 486nm, and E represents the light with a wavelength of 435nm. Figure 5 As can be seen from the five solid lines shown in the figure, the defocus of the light of the above wavelengths is within a very small range, all between -0.01 and 0.05 mm. The pictures taken with the zoom lens can avoid the problem of color separation and obtain good shooting effects.

[0125] refer to Figure 6 , Figure 6 The astigmatism diagram of the zoom lens at telephoto is shown. The solid line in the astigmatism diagram represents the field curvature value of the light with the center wavelength (555nm) on the meridional image plane, and the dotted line represents the field curvature value of the light with the center wavelength (555nm) on the sagittal image plane. Figure 6 It can be seen that there is a clearly focused image across the entire field of view.

[0126] refer to Figure 7 , Figure 7 The figure shows the distortion diagram of the zoom lens in the telephoto state. The solid line in the distortion diagram represents the distortion value of the light with the central wavelength (555nm) passing through the zoom lens. Figure 7 It can be seen that the light distortion is small, less than the 2% image distortion threshold that can be perceived by the human eye.

[0127] refer to Figure 8 , Figure 8 The spherical chromatic aberration diagram of the zoom lens in the macro state is shown. For the convenience of illustration, the simulation is carried out using light of different frequencies as an example. Figure 8 Several frequencies of light commonly used in imaging are exemplified in FIG. Figure 8 The five solid curves in the figure are the wavelengths of 650nm, 587nm, 546nm, 486nm and 435nm. Figure 8 A represents the light with a wavelength of 650nm, B represents the light with a wavelength of 587nm, C represents the light with a wavelength of 546nm, E represents the light with a wavelength of 486nm, and E represents the light with a wavelength of 435nm. Figure 8 As can be seen from the five solid lines shown in the figure, the defocus of the light of the above wavelengths is within a very small range, all between -0.03 and 0.08 mm. The pictures taken with the zoom lens can avoid the problem of color separation and obtain good shooting effects.

[0128] refer to Figure 9 , Figure 9 The astigmatism diagram of the zoom lens in the macro state is shown. The solid line in the astigmatism diagram represents the field curvature value of the light with the center wavelength (555nm) on the meridional image plane, and the dotted line represents the field curvature value of the light with the center wavelength (555nm) on the sagittal image plane. Figure 9 It can be seen that there is a clearly focused image across the entire field of view.

[0129] refer to Figure 10 , Figure 10 The figure shows the distortion diagram of the zoom lens in the macro state. The solid line in the distortion diagram represents the distortion value of the light with the center wavelength (555nm) passing through the zoom lens. Figure 10 It can be seen that the light distortion is small, less than the 2% image distortion threshold that can be perceived by the human eye.

[0130] refer to Figure 11 , Figure 11 This diagram shows the structure of a second zoom lens provided by an embodiment of the present application. From left to right (object side to image side), the zoom lens comprises a first lens group G1 and a second lens group G2, arranged in that order. The first lens group G1 has one lens; the second lens group G2 has two lenses. This embodiment uses the second lens group G2 to focus along the optical axis, making it suitable for both macro and telephoto photography.

[0131] As an optional solution, a stop 30 may be provided in the zoom lens. The stop 30 is located on a side of the first lens group close to the object side to constrain the light incident into the first lens group G1.

[0132] As an optional solution, the zoom lens may further include a filter 10. Exemplarily, from the object side to the image side, behind the second lens group G2 is a filter 10 for correcting color deviation or a flat glass L1 for protecting the imaging photosensitive element. The imaging sensor 20 is located at the image plane and can be a CCD or a CMOS.

[0133] The zoom lens provided in this embodiment of the present application has a first lens group G1 with positive refractive power, and a second lens group G2 with negative refractive power. For example, the focal length EFLG1 of the first lens group G1 is 5.80 mm, and the focal length EFLG2 of the second lens group G2 is -4.75 mm. The ratio of the focal length EFLG1 of the first lens group G1 to the focal length EFLG2 of the second lens group G2 is |EFLG1 / EFLG2|=1.22; and the ratio of the focal length EFL of the second lens G2 to the focal length EFLG1 of the zoom lens is |EFLG2 / EFL|=0.4.

[0134] The first lens group G1 includes a first lens LG11, which has positive optical power. Furthermore, the material of the first lens LG11 is optical glass, specifically, an optical glass convex lens. The second lens group G2 includes two lenses, a third lens LG21 and a fourth lens LG22, each of which has negative optical power. The materials of the third lens LG21 and the fourth lens LG22 can be either optical glass or optical plastic.

[0135] The zoom lens has a focal length of 12mm, an aperture of F# = 3.11, an optical length TTL of 13.41mm, and a half-image height (IH) of 2.5mm. The vertical magnification β in macro mode is 0.3.

[0136] When the zoom lens is in the telephoto to macro mode, the second lens group G2 has a travel distance Δ of 1.31 mm, and the ratio of the travel distance Δ to the total optical length is Δ / TTL = 0.1. To facilitate understanding of the zoom lens provided in the embodiments of the present application, the following detailed description of the parameters of each lens and the zoom lens is provided in conjunction with a specific table.

[0137] The following first explains the meaning of the numbers in the table below: LG11S1 refers to the object-facing side of the first lens LG11, and LG11S2 refers to the image-facing side of the first lens LG11; LG21S1 refers to the object-facing side of the third lens LG21, and LG21S2 refers to the image-facing side of the third lens LG21; LG22S1 refers to the object-facing side of the fourth lens LG22, and LG22S2 refers to the image-facing side of the fourth lens LG22.

[0138] First, refer to Table 2a, which shows the aspheric coefficients of various aspheric lenses, wherein A4 to A30 are aspheric coefficients.

[0139] Table 2a

[0140]

[0141]

[0142] Table 2a In this embodiment, all aspheric surface shapes can be defined using, but not limited to, the following aspheric surface formula:

[0143]

[0144] Wherein, z is the aspheric height, r is the radial coordinate of the aspheric surface, c is the aspheric vertex curvature, K is the quadratic surface constant, and A2, A4, ..., A30 are aspheric coefficients.

[0145] Refer to Table 2b, which shows the basic parameters of the zoom lens in the telephoto state.

[0146] Table 2b

[0147]

[0148] Refer to Table 2c, which shows the basic parameters of the zoom lens in the macro state.

[0149] Table 2c

[0150]

[0151] Refer to Table 2d, which shows the parameters of the zoom lens. When the lenses in the first lens group G1 and the second lens group G2 adopt the above parameters, the corresponding parameters of the zoom lens are as shown in Table 2d.

[0152] Table 2d

[0153] Macro magnification β 0.3 Infinity F# 3.42 EFLG1 5.80 EFLG2 -4.75 Infinity EFL 12.00 |EFLG1 / EFLG2| 1.22 |EFLG2 / EFL| 0.40 △ 1.31 Optical total length TTL 13.41 △ / TTL 0.10

[0154] To facilitate understanding of the shooting effect provided by the embodiment of the present application, Figure 11The zoom lens shown in FIG2 is used as an example for simulation. The specific parameters of the zoom lens can be found in Table 2a, Table 2b, Table 2c, and Table 2d. The following describes the effect of the zoom lens in simulation in detail with reference to the accompanying drawings.

[0155] First reference Figure 12 , Figure 12 The spherical chromatic aberration diagram of the zoom lens at a long distance is shown in FIG. For the convenience of illustration, light of different frequencies is used as an example for simulation. Figure 12 Several frequencies of light commonly used in imaging are exemplified in FIG. Figure 12 The five solid curves in the figure are the wavelengths of 650nm, 587nm, 546nm, 486nm and 435nm. Figure 12 A represents light with a wavelength of 650nm, B represents light with a wavelength of 587nm, C represents light with a wavelength of 546nm, D represents light with a wavelength of 486nm, and E represents light with a wavelength of 435nm. Figure 12 As can be seen from the five solid lines shown in the figure, the defocus of the light of the above wavelengths is within a very small range, all located between -0.06 and 0.08 mm. The pictures taken with the zoom lens can avoid the problem of color separation and obtain good shooting effects.

[0156] refer to Figure 13 , Figure 13 The astigmatism diagram of the zoom lens at telephoto is shown. The solid line in the astigmatism diagram represents the field curvature value of the light with the center wavelength (555nm) on the meridional image plane, and the dotted line represents the field curvature value of the light with the center wavelength (555nm) on the sagittal image plane. Figure 13 It can be seen that there is a clearly focused image across the entire field of view.

[0157] refer to Figure 14 , Figure 14 The figure shows the distortion diagram of the zoom lens in the telephoto state. The solid line in the distortion diagram represents the distortion value of the light with the central wavelength (555nm) passing through the zoom lens. Figure 14 It can be seen that the light distortion is small, less than the 2% image distortion threshold that can be perceived by the human eye.

[0158] refer to Figure 15 , Figure 15 The spherical chromatic aberration diagram of the zoom lens in the macro state is shown. For the convenience of illustration, the simulation is carried out using light of different frequencies as an example. Figure 15 Several frequencies of light commonly used in imaging are exemplified in FIG. Figure 15 The five solid curves in the figure are the wavelengths of 650nm, 587nm, 546nm, 486nm and 435nm. Figure 15A represents the light with a wavelength of 650nm, B represents the light with a wavelength of 587nm, C represents the light with a wavelength of 546nm, E represents the light with a wavelength of 486nm, and E represents the light with a wavelength of 435nm. Figure 15 As can be seen from the five solid lines shown in the figure, the defocus of the light of the above wavelengths is within a very small range, all between -0.02 and 0.1 mm. The pictures taken with the zoom lens can avoid the problem of color separation and obtain good shooting effects.

[0159] refer to Figure 16 , Figure 16 The astigmatism diagram of the zoom lens in the macro state is shown. The solid line in the astigmatism diagram represents the field curvature value of the light with the center wavelength (555nm) on the meridional image plane, and the dotted line represents the field curvature value of the light with the center wavelength (555nm) on the sagittal image plane. Figure 16 It can be seen that there is a clearly focused image across the entire field of view.

[0160] refer to Figure 17 , Figure 17 The figure shows the distortion diagram of the zoom lens in the macro state. The solid line in the distortion diagram represents the distortion value of the light with the center wavelength (555nm) passing through the zoom lens. Figure 17 It can be seen that the light distortion is small, less than the 2% image distortion threshold that can be perceived by the human eye.

[0161] refer to Figure 18 , Figure 18 The diagram shows the structure of a third zoom lens provided by an embodiment of the present application. From left to right (object side to image side), the zoom lens comprises a first lens group G1 and a second lens group G2, arranged in that order. The first lens group G1 has two lenses, while the second lens group G2 has one lens. This embodiment utilizes the second lens group G2 to focus along the optical axis, making it suitable for both macro and telephoto photography.

[0162] As an optional solution, a stop 30 may be provided in the zoom lens. The stop 30 is located on a side of the first lens group close to the object side to constrain the light incident into the first lens group G1.

[0163] As an optional solution, the zoom lens may further include a filter 10. Exemplarily, from the object side to the image side, behind the second lens group G2 is a filter 10 for correcting color deviation or a flat glass L1 for protecting the imaging photosensitive element. The imaging sensor 20 is located at the image plane and can be a CCD or a CMOS.

[0164] The zoom lens provided in this embodiment has a first lens group G1 with positive refractive power, and a second lens group G2 with negative refractive power. For example, the focal length EFLG1 of the first lens group G1 is 10.27 mm, and the focal length EFLG2 of the second lens group G2 is -16.4 mm. The ratio of the focal length EFLG1 of the first lens group G1 to the focal length EFLG2 of the second lens group G2 is |EFLG1 / EFLG2|=0.63; and the ratio of the focal length EFL of the second lens G2 to the focal length EFLG1 of the zoom lens is |EFLG2 / EFL|=0.99.

[0165] The first lens group G1 includes a first lens LG11 and a second lens LG12. The first lens LG11 has positive optical power, while the second lens LG12 has negative optical power. Furthermore, the material of the first lens LG11 is optical glass, specifically an optical glass convex lens. The second lens group G2 includes a third lens LG21. The third lens LG21 can have either positive or negative optical power, without specific limitation. The material of the third lens LG21 can be either optical glass or optical plastic, without specific limitation in this application.

[0166] The zoom lens has a focal length of 16.6mm, an aperture of F# = 3.32, an optical length TTL of 18mm, and a half-image height (IH) of 2.5mm. The vertical magnification β in macro mode is 0.3.

[0167] When the zoom lens is in the telephoto to macro mode, the second lens group G2 has a travel distance Δ = 4 mm, and the ratio of the travel distance Δ to the total optical length is Δ / TTL = 0.22. To facilitate understanding of the zoom lens provided in the embodiments of the present application, the following detailed description of the parameters of each lens and the zoom lens is provided in conjunction with a specific table.

[0168] The following first explains the meaning of the numbers in the table below: LG11S1 refers to the object-facing side of the first lens LG11, and LG11S2 refers to the image-facing side of the first lens LG11; LG12S1 refers to the object-facing side of the second lens LG12, and LG12S2 refers to the image-facing side of the second lens LG12; LG21S1 refers to the object-facing side of the third lens LG21, and LG21S2 refers to the image-facing side of the third lens LG21.

[0169] First, refer to Table 3a, which shows the aspheric coefficients of various aspheric lenses, wherein A4 to A30 are aspheric coefficients.

[0170] Table 3a

[0171]

[0172]

[0173] In this embodiment, all aspheric surface shapes can be defined using, but not limited to, the following aspheric surface formula:

[0174]

[0175] Among them, z is the sag of the aspheric surface, r is the radial coordinate of the aspheric surface, c is the vertex spherical curvature of the aspheric surface, K is the quadratic surface constant, and A2, A4, A6, A8, A10, and A12 are aspheric coefficients.

[0176] Refer to Table 3b, which shows the basic parameters of the zoom lens in the telephoto state.

[0177] Table 3b

[0178]

[0179]

[0180] Refer to Table 3c, which shows the basic parameters of the zoom lens in the macro state.

[0181] Table 3c

[0182]

[0183] Referring to Table 3d, which shows the parameters of the zoom lens, when the lenses in the first lens group G1 and the second lens group G2 adopt the above parameters, the corresponding parameters of the zoom lens are as shown in Table 3d.

[0184] Table 3d

[0185] Macro magnification β 0.3 Infinity F# 3.42 EFLG1 10.27 EFLG2 -16.4 Infinity EFL 16.6 |EFLG1 / EFLG2| 0.63 |EFLG2 / EFL| 0.99 △ 4 Optical total length TTL 18 △ / TTL 0.22

[0186] To facilitate understanding of the shooting effect provided by the embodiment of the present application, Figure 18 The zoom lens shown in FIG. 1 is used as an example for simulation. The specific parameters of the zoom lens can be found in Table 3a, Table 3b, Table 3c, and Table 3d. The following describes the effect of the zoom lens in simulation in detail with reference to the accompanying drawings.

[0187] First reference Figure 19 , Figure 19 The spherical chromatic aberration diagram of the zoom lens at a long distance is shown in FIG. For the convenience of illustration, light of different frequencies is used as an example for simulation. Figure 19 Several frequencies of light commonly used in imaging are exemplified in FIG. Figure 19 The five solid curves in the figure are the wavelengths of 650nm, 587nm, 546nm, 486nm and 435nm. Figure 19A represents the light with a wavelength of 650nm, B represents the light with a wavelength of 587nm, C represents the light with a wavelength of 546nm, E represents the light with a wavelength of 486nm, and E represents the light with a wavelength of 435nm. Figure 19 As can be seen from the five solid lines shown in the figure, the defocus of the light of the above wavelengths is within a very small range, all located between -0.12 and 0.15 mm. The pictures taken with the zoom lens can avoid the problem of color separation and obtain good shooting effects.

[0188] refer to Figure 20 , Figure 20 The astigmatism diagram of the zoom lens at telephoto is shown. The solid line in the astigmatism diagram represents the field curvature value of the light with the center wavelength (555nm) on the meridional image plane, and the dotted line represents the field curvature value of the light with the center wavelength (555nm) on the sagittal image plane. Figure 20 It can be seen that there is a clearly focused image across the entire field of view.

[0189] refer to Figure 21 , Figure 21 The figure shows the distortion diagram of the zoom lens in the telephoto state. The solid line in the distortion diagram represents the distortion value of the light with the central wavelength (555nm) passing through the zoom lens. Figure 21 It can be seen that the light distortion is small, less than the 2% image distortion threshold that can be perceived by the human eye.

[0190] refer to Figure 22 , Figure 22 The spherical chromatic aberration diagram of the zoom lens in the macro state is shown. For the convenience of illustration, the simulation is carried out using light of different frequencies as an example. Figure 22 Several frequencies of light commonly used in imaging are exemplified in FIG. Figure 22 The five solid curves in the figure are the wavelengths of 650nm, 587nm, 546nm, 486nm and 435nm. Figure 22 A represents the light with a wavelength of 650nm, B represents the light with a wavelength of 587nm, C represents the light with a wavelength of 546nm, E represents the light with a wavelength of 486nm, and E represents the light with a wavelength of 435nm. Figure 22 As can be seen from the five solid lines shown in the figure, the defocus of the light of the above wavelengths is within a very small range, all between -0.02 and 0.01 mm. The pictures taken with the zoom lens can avoid the problem of color separation and obtain good shooting effects.

[0191] refer to Figure 23 , Figure 23The astigmatism diagram of the zoom lens in the macro state is shown. The solid line in the astigmatism diagram represents the field curvature value of the light with the center wavelength (555nm) on the meridional image plane, and the dotted line represents the field curvature value of the light with the center wavelength (555nm) on the sagittal image plane. Figure 23 It can be seen that there is a clearly focused image across the entire field of view.

[0192] refer to Figure 24 , Figure 24 The figure shows the distortion diagram of the zoom lens in the macro state. The solid line in the distortion diagram represents the distortion value of the light with the center wavelength (555nm) passing through the zoom lens. Figure 24 It can be seen that the light distortion is small, less than the 2% image distortion threshold that can be perceived by the human eye.

[0193] refer to Figure 25 , Figure 25 The fourth zoom lens provided in this embodiment is schematically illustrated. From left to right (object side to image side), the zoom lens comprises a first lens group G1 and a second lens group G2, arranged in that order. The first lens group G1 comprises three lenses, while the second lens group G2 comprises two lenses. This embodiment utilizes the second lens group G2 to focus along the optical axis, making it suitable for both macro and telephoto photography.

[0194] As an optional solution, a stop 30 may be provided in the zoom lens. The stop 30 is located on a side of the first lens group close to the object side to constrain the light incident into the first lens group G1.

[0195] As an optional solution, the zoom lens may further include a filter 10. Exemplarily, from the object side to the image side, behind the second lens group G2 is a filter 10 for correcting color deviation or a flat glass L1 for protecting the imaging photosensitive element. The imaging sensor 20 is located at the image plane and can be a CCD or a CMOS.

[0196] The zoom lens provided in this embodiment of the present application has a first lens group G1 with positive refractive power, and a second lens group G2 with negative refractive power. For example, the focal length EFLG1 of the first lens group G1 is 8.03 mm, and the focal length EFLG2 of the second lens group G2 is -10.14 mm. The ratio of the focal length EFLG1 of the first lens group G1 to the focal length EFLG2 of the second lens group G2 is |EFLG1 / EFLG2|=0.79; and the ratio of the focal length EFL of the second lens G2 to the focal length EFLG1 of the zoom lens is |EFLG2 / EFL|=0.70.

[0197] The first lens group G1 includes a first lens LG11, a second lens LG12, and a third lens LG13. The first lens LG11 has positive optical power, the second lens LG12 has negative optical power, and the third lens LG13 has positive optical power. Furthermore, the first lens LG11 is made of optical glass, specifically an optical glass convex lens. The second lens group G2 includes a fourth lens LG21 and a fifth lens LG22. The fourth lens LG21 has negative optical power, and the fifth lens LG22 can have either positive or negative optical power, without specific limitations herein. The fourth lens LG21 and the fifth lens LG22 can be made of either optical glass or optical plastic, without specific limitations herein.

[0198] The zoom lens has a focal length of 14.45mm, an aperture of F# of 3.43, an optical length TTL of 15.5mm, and a half-image height (IH) of 2.5mm. The vertical magnification β in macro mode is 0.3.

[0199] When the zoom lens is in the telephoto to macro mode, the travel distance of the second lens group G2 is Δ = 2.38 mm, and the ratio of the travel distance Δ to the total optical length is Δ / TTL = 0.15. To facilitate understanding of the zoom lens provided in the embodiments of the present application, the parameters of each lens and the zoom lens are described in detail below with reference to a specific table.

[0200] The following first explains the meaning of the numbers in the table below: LG11S1 refers to the object-facing surface of the first lens element LG11, and LG11S2 refers to the image-facing surface of the first lens element LG11; LG12S1 refers to the object-facing surface of the second lens element LG12, and LG12S2 refers to the image-facing surface of the second lens element LG12; LG13S1 refers to the object-facing surface of the third lens element LG13, and LG13S2 refers to the image-facing surface of the third lens element LG13; LG21S1 refers to the object-facing surface of the fourth lens element LG21, and LG21S2 refers to the image-facing surface of the fourth lens element LG21; LG22S1 refers to the object-facing surface of the fifth lens element LG22, and LG22S2 refers to the image-facing surface of the fifth lens element LG22.

[0201] First, refer to Table 4a, which shows the aspheric coefficients of various aspheric lenses, wherein A4 to A30 are aspheric coefficients.

[0202] Table 4a

[0203]

[0204] In this embodiment, all aspheric surface shapes can be defined using, but not limited to, the following aspheric surface formula:

[0205]

[0206] Wherein, z is the aspheric height, r is the radial coordinate of the aspheric surface, c is the vertex spherical curvature of the aspheric surface, K is the quadratic surface constant, and A2, A4, A6, A8, …, A28, and A30 are aspheric coefficients.

[0207] Refer to Table 4b, which shows the basic parameters of the zoom lens in the telephoto state.

[0208] Table 4b

[0209]

[0210]

[0211] Refer to Table 4c, which shows the basic parameters of the zoom lens in the macro state.

[0212] Table 4c

[0213]

[0214] Referring to Table 4d, which shows the parameters of the zoom lens, when the lenses in the first lens group G1 and the second lens group G2 adopt the above parameters, the corresponding parameters of the zoom lens are as shown in Table 4d.

[0215] Table 4d

[0216]

[0217]

[0218] To facilitate understanding of the shooting effect provided by the embodiment of the present application, Figure 25 The zoom lens shown in FIG. 4 is used as an example for simulation. The specific parameters of the zoom lens can be found in Table 4a, Table 4b, Table 4c, and Table 4d. The following details the effects of the zoom lens in simulation with reference to the accompanying drawings.

[0219] First reference Figure 26 , Figure 26 The spherical chromatic aberration diagram of the zoom lens at a long distance is shown in FIG. For the convenience of illustration, light of different frequencies is used as an example for simulation. Figure 26 Several frequencies of light commonly used in imaging are exemplified in FIG. Figure 26 The five solid curves in the figure are the wavelengths of 650nm, 587nm, 546nm, 486nm and 435nm. Figure 26 A represents the light with a wavelength of 650nm, B represents the light with a wavelength of 587nm, C represents the light with a wavelength of 546nm, E represents the light with a wavelength of 486nm, and E represents the light with a wavelength of 435nm. Figure 26As can be seen from the five solid lines shown in the figure, the defocus of the light of the above wavelengths is within a very small range, all between -0.01 and 0.05 mm. The pictures taken with the zoom lens can avoid the problem of color separation and obtain good shooting effects.

[0220] refer to Figure 27 , Figure 27 The astigmatism diagram of the zoom lens at telephoto is shown. The solid line in the astigmatism diagram represents the field curvature value of the light with the center wavelength (555nm) on the meridional image plane, and the dotted line represents the field curvature value of the light with the center wavelength (555nm) on the sagittal image plane. Figure 27 It can be seen that there is a clearly focused image across the entire field of view.

[0221] refer to Figure 28 , Figure 28 The figure shows the distortion diagram of the zoom lens in the telephoto state. The solid line in the distortion diagram represents the distortion value of the light with the central wavelength (555nm) passing through the zoom lens. Figure 28 It can be seen that the light distortion is small, less than the 2% image distortion threshold that can be perceived by the human eye.

[0222] refer to Figure 29 , Figure 29 The spherical chromatic aberration diagram of the zoom lens in the macro state is shown. For the convenience of illustration, the simulation is carried out using light of different frequencies as an example. Figure 29 Several frequencies of light commonly used in imaging are exemplified in FIG. Figure 29 The five solid curves in the figure are the wavelengths of 650nm, 587nm, 546nm, 486nm and 435nm. Figure 29 A represents the light with a wavelength of 650nm, B represents the light with a wavelength of 587nm, C represents the light with a wavelength of 546nm, E represents the light with a wavelength of 486nm, and E represents the light with a wavelength of 435nm. Figure 29 As can be seen from the five solid lines shown in the figure, the defocus of the light of the above wavelengths is within a very small range, all located between -0.04 and 0.05 mm. The pictures taken with the zoom lens can avoid the problem of color separation and obtain good shooting effects.

[0223] refer to Figure 30 , Figure 30 The astigmatism diagram of the zoom lens in the macro state is shown. The solid line in the astigmatism diagram represents the field curvature value of the light with the center wavelength (555nm) on the meridional image plane, and the dotted line represents the field curvature value of the light with the center wavelength (555nm) on the sagittal image plane. Figure 30 It can be seen that there is a clearly focused image across the entire field of view.

[0224] refer to Figure 31 , Figure 31 The solid line represents the distortion value of the light with the central wavelength (555nm) passing through the zoom lens. Figure 31 It can be seen that the light distortion is small, less than the 2% image distortion threshold that can be perceived by the human eye.

[0225] refer to Figure 32 , Figure 32 The diagram shows the structure of the fifth zoom lens provided by an embodiment of the present application. From left to right (object side to image side), the zoom lens comprises a first lens group G1 and a second lens group G2, arranged in that order. The first lens group G1 comprises three lenses, while the second lens group G2 comprises two lenses. This embodiment utilizes the second lens group G2 to focus along the optical axis, making it suitable for both macro and telephoto photography.

[0226] As an optional solution, a stop 30 may be provided in the zoom lens. The stop 30 is located on a side of the first lens group close to the object side to constrain the light incident into the first lens group G1.

[0227] As an optional solution, the zoom lens may further include a filter 10. Exemplarily, from the object side to the image side, behind the second lens group G2 is a filter 10 for correcting color deviation or a flat glass L1 for protecting the imaging photosensitive element. The imaging sensor 20 is located at the image plane and can be a CCD or a CMOS.

[0228] The zoom lens provided in this embodiment has a first lens group G1 with positive refractive power, and a second lens group G2 with negative refractive power. For example, the focal length EFLG1 of the first lens group G1 is 8.03 mm, and the focal length EFLG2 of the second lens group G2 is -10.14 mm. The ratio of the focal length EFLG1 of the first lens group G1 to the focal length EFLG2 of the second lens group G2 is |EFLG1 / EFLG2|=0.79; and the ratio of the focal length EFL of the second lens G2 to the focal length EFLG1 of the zoom lens is |EFLG2 / EFL|=0.70.

[0229] The first lens group G1 includes a first lens LG11, a second lens LG12, and a third lens LG13. The first lens LG11 has positive optical power, the second lens LG12 has negative optical power, and the third lens LG13 has positive optical power. Furthermore, the first lens LG11 is made of optical glass, specifically an optical glass convex lens. The second lens group G2 includes a fourth lens LG21 and a fifth lens LG22. The fourth lens LG21 has negative optical power, and the fifth lens LG22 can have either positive or negative optical power, without specific limitations herein. The fourth lens LG21 and the fifth lens LG22 can be made of either optical glass or optical plastic, without specific limitations herein.

[0230] The zoom lens has a focal length of 14.45mm, an aperture of F# of 3.43, an optical length TTL of 15.5mm, and a half-image height (IH) of 2.5mm. The vertical magnification β in macro mode is 0.3.

[0231] When the zoom lens is in the telephoto to macro mode, the travel distance of the second lens group G2 is Δ = 2.38 mm, and the ratio of the travel distance Δ to the total optical length is Δ / TTL = 0.15. To facilitate understanding of the zoom lens provided in the embodiments of the present application, the parameters of each lens and the zoom lens are described in detail below with reference to a specific table.

[0232] The following first explains the meaning of the numbers in the table below: LG11S1 refers to the object-facing surface of the first lens element LG11, and LG11S2 refers to the image-facing surface of the first lens element LG11; LG12S1 refers to the object-facing surface of the second lens element LG12, and LG12S2 refers to the image-facing surface of the second lens element LG12; LG13S1 refers to the object-facing surface of the third lens element LG13, and LG13S2 refers to the image-facing surface of the third lens element LG13; LG21S1 refers to the object-facing surface of the fourth lens element LG21, and LG21S2 refers to the image-facing surface of the fourth lens element LG21; LG22S1 refers to the object-facing surface of the fifth lens element LG22, and LG22S2 refers to the image-facing surface of the fifth lens element LG22.

[0233] First, refer to Table 5a, which shows the aspheric coefficients of various aspheric lenses, wherein A4 to A30 are aspheric coefficients.

[0234] Table 5a

[0235]

[0236]

[0237] In this embodiment, all aspheric surface shapes can be defined using, but not limited to, the following aspheric surface formula:

[0238]

[0239] Among them, z is the sag of the aspheric surface, r is the radial coordinate of the aspheric surface, c is the vertex spherical curvature of the aspheric surface, K is the quadratic surface constant, and A2, A4, A6, A8, A10, and A12 are aspheric coefficients.

[0240] Refer to Table 5b, which shows the basic parameters of the zoom lens in the telephoto state.

[0241] Table 5b

[0242]

[0243] Refer to Table 5c, which shows the basic parameters of the zoom lens in the macro state.

[0244] Table 5c

[0245]

[0246]

[0247] Refer to Table 5d, which shows the parameters of the zoom lens. When the lenses in the first lens group G1 and the second lens group G2 adopt the above parameters, the corresponding parameters of the zoom lens are as shown in Table 5d.

[0248] Table 5d

[0249] Macro magnification β 0.3 Infinity F# 3 EFLG1 9.6 EFLG2 -10.77 Infinity EFL 16.5 |EFLG1 / EFLG2| 0.89 |EFLG2 / EFL| 0.65 △ 1.68 Optical total length TTL 17.3 △ / TTL 0.10

[0250] To facilitate understanding of the shooting effect provided by the embodiment of the present application, Figure 32 The zoom lens shown in FIG. 1 is used as an example for simulation. The specific parameters of the zoom lens can be found in Table 5a, Table 5b, Table 5c, and Table 5d. The following details the effects of the zoom lens in simulation with reference to the accompanying drawings.

[0251] First reference Figure 33 , Figure 33 The spherical chromatic aberration diagram of the zoom lens at a long distance is shown in FIG. For the convenience of illustration, light of different frequencies is used as an example for simulation. Figure 33 Several frequencies of light commonly used in imaging are exemplified in FIG. Figure 33 The five solid curves in the figure are the wavelengths of 650nm, 587nm, 546nm, 486nm and 435nm. Figure 33 A represents the light with a wavelength of 650nm, B represents the light with a wavelength of 587nm, C represents the light with a wavelength of 546nm, E represents the light with a wavelength of 486nm, and E represents the light with a wavelength of 435nm. Figure 33 As can be seen from the five solid lines shown in the figure, the defocus of the light of the above wavelengths is within a very small range, all between -0.03 and 0.05 mm. The pictures taken with the zoom lens can avoid the problem of color separation and obtain good shooting effects.

[0252] refer to Figure 34 , Figure 34 The astigmatism diagram of the zoom lens at telephoto is shown. The solid line in the astigmatism diagram represents the field curvature value of the light with the center wavelength (555nm) on the meridional image plane, and the dotted line represents the field curvature value of the light with the center wavelength (555nm) on the sagittal image plane. Figure 34 It can be seen that there is a clearly focused image across the entire field of view.

[0253] refer to Figure 35 , Figure 35 The figure shows the distortion diagram of the zoom lens in the telephoto state. The solid line in the distortion diagram represents the distortion value of the light with the central wavelength (555nm) passing through the zoom lens. Figure 35 It can be seen that the light distortion is small, less than the 2% image distortion threshold that can be perceived by the human eye.

[0254] refer to Figure 36 , Figure 36 The spherical chromatic aberration diagram of the zoom lens in the macro state is shown. For the convenience of illustration, the simulation is carried out using light of different frequencies as an example. Figure 36 Several frequencies of light commonly used in imaging are exemplified in FIG. Figure 36 The five solid curves in the figure are the wavelengths of 650nm, 587nm, 546nm, 486nm and 435nm. Figure 36 A represents the light with a wavelength of 650nm, B represents the light with a wavelength of 587nm, C represents the light with a wavelength of 546nm, E represents the light with a wavelength of 486nm, and E represents the light with a wavelength of 435nm. Figure 36 As can be seen from the five solid lines shown in the figure, the defocus of the light of the above wavelengths is within a very small range, all located between -0.04 and 0.1 mm. The pictures taken with the zoom lens can avoid the problem of color separation and obtain good shooting effects.

[0255] refer to Figure 37 , Figure 37 The astigmatism diagram of the zoom lens in the macro state is shown. The solid line in the astigmatism diagram represents the field curvature value of the light with the center wavelength (555nm) on the meridional image plane, and the dotted line represents the field curvature value of the light with the center wavelength (555nm) on the sagittal image plane. Figure 37 It can be seen that there is a clearly focused image across the entire field of view.

[0256] refer to Figure 38 , Figure 38 The solid line represents the distortion value of the light with the central wavelength (555nm) passing through the zoom lens. Figure 31 It can be seen that the light distortion is small, less than the 2% image distortion threshold that can be perceived by the human eye.

[0257] Figure 39Another zoom lens provided by an embodiment of the present application is shown. The zoom lens further includes a reflector 40, which is located near the object side of the first lens group G1 and is used to reflect light toward the first lens group G1, thereby enabling periscope photography and improving lens placement space. Of course, in addition to using a reflector, a prism can also be used. A prism placed on the object side of the first lens group G1 can also reflect light toward the first lens group G1, achieving the same effect.

[0258] It can be seen from the above specific embodiments that the zoom lens provided in the embodiments of the present application can introduce the focusing method of the second lens group by adopting a technical solution of combining the first lens group and the second lens group. It can be applied to shooting scenes at long distances and macro distances, and meets the requirements of a compact optical system structure, thereby improving the shooting effect of mobile terminals.

[0259] Figure 40 The application scenario of the zoom lens in the mobile phone is shown. When the zoom lens 300 adopts a periscope type, the arrangement direction of the lens group 301 in the zoom lens 300 can be parallel to the length direction of the mobile phone shell 400, and the lens group 301 is set between the mobile phone shell 400 and the middle frame 500. It should be understood that Figure 40 The figure only illustrates the location and method of setting the lens group 301. Figure 40 The lens group 301 in FIG does not represent the actual number of lenses in the lens group 301. Figure 40 It can be seen that when the zoom lens adopts a periscope type, it can reduce the impact on the thickness of the mobile phone.

[0260] The present application also provides a camera module, including a photosensitive element and any of the zoom lenses described above, wherein the photosensitive element is located on the image side of the zoom lens, wherein the zoom lens is used to receive light reflected from the object being photographed and project it onto the photosensitive element, and the photosensitive element is used to convert the light into an image signal. In the above technical solution, by adopting a technical solution combining two lens groups, it can be applied to shooting scenes at long distances and macro distances, and compared with existing lenses compatible with long distances and macro distances, it meets the miniaturization requirements, achieves higher resolution, and better aberration control.

[0261] The present application provides a mobile terminal, which may be a mobile phone, a tablet computer, a notebook, etc. The mobile terminal includes a housing, and any one of the above-mentioned zoom lenses arranged in the housing. Figure 40 The periscope zoom lens shown is set in the mobile phone. Figure 32The zoom lens shown in the figure adopts a technical solution combining two lens groups, which can be used for shooting scenes in telephoto and macro range. Compared with existing lenses compatible with telephoto and macro range, it meets the miniaturization requirements and achieves higher resolution and better aberration control.

[0262] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. An optical lens capable of imaging in telephoto and macro modes, characterized in that: include: A first lens group and a second lens group are arranged from the object side to the image side, and the optical lens includes two lens groups; The first lens group is fixed, and the second lens group can slide along the optical axis; wherein, The first lens group has positive optical power; The second lens group has negative optical power; A ratio of a focal length EFLG1 of the first lens group to a focal length EFLG2 of the second lens group satisfies: 0.4<|EFLG1 / EFLG2|<1.22; The ratio of the focal length EFLG2 of the second lens group to the focal length EFL of the optical lens satisfies: 0.4<|EFLG2 / EFL|<1; The first lens group includes at least one lens, and the lens closest to the object side in the first lens group has positive refractive power; When the optical lens moves from the telephoto state to the macro state, the second lens group moves from the object side to the image side, and the ratio of the movement stroke △ of the second lens group to the total optical length TTL of the optical lens satisfies 0.1≤△ / TTL<0.

4.

2. The optical lens according to claim 1, wherein: The lens closest to the object side in the first lens group is a lens made of optical glass.

3. The optical lens according to claim 1 or 2, wherein: The first lens group includes a first lens and a second lens arranged adjacent to each other from the object side to the image side, wherein the first lens is the lens closest to the object side in the first lens group; and the second lens has negative optical power.

4. The optical lens according to any one of claims 1 to 3, wherein: The moving stroke Δ of the second lens group is greater than or equal to 1 mm and less than or equal to 4 mm.

5. The optical lens according to any one of claims 1 to 4, wherein: The second lens group includes at least one lens; wherein, The surface of the lens closest to the object side in the second lens group facing the image side is a concave surface.

6. The optical lens according to any one of claims 1 to 5, wherein: The aperture of the optical lens satisfies 3.43≥F#.

7. The optical lens according to any one of claims 1 to 6, wherein: In the telephoto state, the second lens group moves close to the object side, and the focal distance ODt of the optical lens satisfies: 1m <ODt<∞。 8. The optical lens according to any one of claims 1 to 7, wherein: In the macro state, the second lens group moves close to the image side, and the focus distance Odm of the optical lens satisfies: 0.03m <Odm<0.2m。 9. The optical lens according to any one of claims 1 to 8, wherein: The macro vertical axis magnification of the optical lens is 0.3≤β<0.

7.

10. The optical lens according to any one of claims 1 to 9, wherein: A ratio of a focal length EFLG1 of the first lens group to a focal length EFLG2 of the second lens group satisfies 0.63<|EFLG1 / EFLG2|<1.

22.

11. The optical lens according to any one of claims 1 to 10, wherein: A ratio of a focal length EFLG1 of the first lens group to a focal length EFLG2 of the second lens group satisfies 0.79<|EFLG1 / EFLG2|<1.

22.

12. The optical lens according to any one of claims 1 to 11, wherein: The ratio of the focal length EFLG2 of the second lens group to the focal length EFL of the optical lens satisfies: 0.4<|EFLG2 / EFL|<0.

86.

13. The optical lens according to claim 12, wherein: The ratio of the focal length EFLG2 of the second lens group to the focal length EFL of the optical lens satisfies: 0.4<|EFLG2 / EFL|<0.

7.

14. The optical lens according to any one of claims 1 to 13, wherein: The focal length EFLG1 of the first lens group satisfies 5.80 mm ≤ EFLG1 ≤ 10.27 mm.

15. The optical lens according to any one of claims 1 to 14, wherein: A ratio of a moving stroke Δ of the second lens group to a total optical length TTL of the optical lens satisfies 0.15≤Δ / TTL<0.

4.

16. The optical lens according to any one of claims 1 to 14, wherein: A ratio of a moving stroke Δ of the second lens group to a total optical length TTL of the optical lens satisfies 0.1≤Δ / TTL≤0.

22.

17. The optical lens according to any one of claims 1 to 16, wherein: The moving stroke Δ of the second lens group satisfies 1.31 mm ≤ Δ < 4 mm.

18. A camera module, characterized in that: It comprises a photosensitive element and an optical lens as described in any one of claims 1 to 17, wherein the photosensitive element is located on the image side of the optical lens, wherein the optical lens is used to receive light reflected by the photographed object and project it onto the photosensitive element, and the photosensitive element is used to convert the light into an image signal.

19. A mobile terminal, characterized in that: It comprises a shell, and a camera module as claimed in claim 18 arranged in the shell.

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