CN116990946A - Zoom lens, camera module and electronic equipment - Google Patents

Abstract

The application provides a zoom lens, a camera module and electronic equipment. The zoom lens includes: a first lens group and a second lens group arranged along an object side to an image side; the first lens group has negative focal power, and the second lens group has positive focal power; the zoom lens has a telephoto end and a wide-angle end, and the first lens group and the second lens group are each movable in an optical axis direction to zoom-switch between the telephoto end and the wide-angle end; the critical point number of at least one lens in the zoom lens is more than or equal to 2; the wide-angle end of the zoom lens satisfies the relation: TTLw/ImgH is less than 2.5 and less than 4; wherein TTLw is the total optical length of the zoom lens at the wide-angle end, and ImgH is the image height. The zoom lens provided by the application can improve the imaging quality when being applied to electronic equipment.

Description

Zoom lens, camera module and electronic equipment

Technical Field

The application relates to the technical field of optical imaging, in particular to a zoom lens, a camera module and electronic equipment.

Background

With the development of camera technology, the imaging quality of cameras is required to be higher and higher. In the related art, in order to enable wide-angle photographing and telescopic photographing, a main photographing lens and a telescopic lens are generally provided, respectively, to perform independent photographing, however, this design form may limit the improvement of imaging quality.

Disclosure of Invention

The application provides a zoom lens, a camera module and electronic equipment.

In a first aspect, the present application provides a zoom lens including: a first lens group and a second lens group arranged along an object side to an image side; the first lens group has negative focal power, and the second lens group has positive focal power; the zoom lens has a telephoto end and a wide-angle end, and the first lens group and the second lens group are each movable in an optical axis direction to zoom-switch between the telephoto end and the wide-angle end; the critical point number of at least one lens in the zoom lens is more than or equal to 2; the wide-angle end of the zoom lens satisfies the relation: TTLw/ImgH is less than 2.5 and less than 4; wherein TTLw is the total optical length of the zoom lens at the wide-angle end, and ImgH is the image height.

In a second aspect, the present application further provides a camera module, where the camera module includes an optical filter, a photosensitive element, and a zoom lens, where the zoom lens, the optical filter, and the photosensitive element are sequentially arranged along an optical axis direction, and the first lens group and the second lens group of the zoom lens can move along the optical axis direction relative to the photosensitive element.

In a third aspect, the present application further provides an electronic device, where the electronic device includes a device body and a camera module, the device body has an opening, the camera module is disposed in the device body corresponding to the opening, and a zoom lens of the camera module may extend or retract from the device body at least partially through the opening.

In the zoom lens provided by the embodiment of the application, since the first lens group and the second lens group are movable in the optical axis direction, the zoom switching of the zoom lens between the telephoto end and the wide-angle end can be realized by moving the first lens group and the second lens group. Compared with the related art, the zoom lens provided by the embodiment is equivalent to integrating the telescope lens and the main camera lens, so that the module volume can be reduced, the cost can be reduced, and the imaging quality can be improved by matching with the photosensitive element of the outsole. Furthermore, the zoom lens satisfies the relation, so that the zoom lens is miniaturized and can effectively maintain good optical performance. In addition, when the lens has 2 or more critical points, the shape change of the lens in the radial direction is gentle, so that the excessive thickness of the lens can be avoided, and the occupied space of the lens in the direction of the object side to the image side is reduced, so that the zoom lens is miniaturized, and the zoom lens is more beneficial to being applied to electronic equipment with the requirement of light and thin.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of an electronic device in a state according to an embodiment of the application.

Fig. 2 is a schematic view of the electronic device shown in fig. 1 in another state.

Fig. 3 is a schematic diagram of another view of the electronic device shown in fig. 2.

Fig. 4 is a schematic diagram of a camera module according to an embodiment of the application.

Fig. 5 is a schematic view of a zoom lens according to embodiment 1 of the present application in a contracted state.

Fig. 6 is a schematic view of the zoom lens shown in fig. 5 at the wide-angle end and the telephoto end.

Fig. 7 is a schematic diagram of a lens with critical points according to an embodiment of the application.

Fig. 8 is an astigmatism curve when the zoom lens shown in embodiment 1 is at the wide-angle end.

Fig. 9 is an on-axis chromatic aberration curve when the zoom lens shown in embodiment 1 is at the wide-angle end.

Fig. 10 is a distortion curve when the zoom lens shown in embodiment 1 is at the wide-angle end.

Fig. 11 is an astigmatism curve when the zoom lens shown in embodiment 1 is at the telephoto end.

Fig. 12 is an on-axis chromatic aberration curve when the zoom lens shown in embodiment 1 is at the telephoto end.

Fig. 13 is a distortion curve when the zoom lens shown in embodiment 1 is at the telephoto end.

Fig. 14 is a schematic view of a zoom lens according to embodiment 2 of the present application in a contracted state.

Fig. 15 is a schematic view of the zoom lens shown in fig. 14 at the wide-angle end and the telephoto end.

Fig. 16 is an astigmatism curve when the zoom lens shown in embodiment 2 is at the wide-angle end.

Fig. 17 is an on-axis chromatic aberration curve when the zoom lens shown in embodiment 2 is at the wide-angle end.

Fig. 18 is a distortion curve when the zoom lens shown in embodiment 2 is at the wide-angle end.

Fig. 19 is an astigmatism curve when the zoom lens shown in embodiment 2 is at the telephoto end.

Fig. 20 is an on-axis chromatic aberration curve when the zoom lens shown in embodiment 2 is at the telephoto end.

Fig. 21 is a distortion curve when the zoom lens shown in embodiment 2 is at the telephoto end.

Fig. 22 is a schematic view of a zoom lens according to embodiment 3 of the present application in a contracted state.

Fig. 23 is a schematic view of the zoom lens shown in fig. 22 at the wide-angle end and the telephoto end.

Fig. 24 is an astigmatism curve when the zoom lens shown in embodiment 3 is at the wide-angle end.

Fig. 25 is an on-axis chromatic aberration curve when the zoom lens shown in embodiment 3 is at the wide-angle end.

Fig. 26 is a distortion curve when the zoom lens shown in embodiment 3 is at the wide-angle end.

Fig. 27 is an astigmatism curve when the zoom lens shown in embodiment 3 is at the telephoto end.

Fig. 28 is an on-axis chromatic aberration curve when the zoom lens shown in embodiment 3 is at the telephoto end.

Fig. 29 is a distortion curve when the zoom lens shown in embodiment 3 is at the telephoto end.

Fig. 30 is a schematic view of a zoom lens according to embodiment 4 of the present application in a contracted state.

Fig. 31 is a schematic view of the zoom lens shown in fig. 30 at the wide-angle end and the telephoto end.

Fig. 32 is an astigmatism curve when the zoom lens shown in embodiment 4 is at the wide-angle end.

Fig. 33 is an on-axis chromatic aberration curve when the zoom lens shown in embodiment 4 is at the wide-angle end.

Fig. 34 is a distortion curve when the zoom lens shown in embodiment 4 is at the wide-angle end.

Fig. 35 is an astigmatism curve when the zoom lens shown in embodiment 4 is at the telephoto end.

Fig. 36 is an on-axis chromatic aberration curve when the zoom lens shown in embodiment 4 is at the telephoto end.

Fig. 37 is a distortion curve when the zoom lens shown in embodiment 4 is at the telephoto end.

Fig. 38 is a schematic view of a zoom lens provided in embodiment 5 of the present application in a contracted state.

Fig. 39 is a schematic view of the zoom lens shown in fig. 38 at the wide-angle end and the telephoto end.

Fig. 40 is an astigmatism curve when the zoom lens shown in embodiment 5 is at the wide-angle end.

Fig. 41 is an on-axis chromatic aberration curve when the zoom lens shown in embodiment 5 is at the wide-angle end.

Fig. 42 is a distortion curve when the zoom lens shown in embodiment 5 is at the wide-angle end.

Fig. 43 is an astigmatism curve when the zoom lens shown in embodiment 5 is at the telephoto end.

Fig. 44 is an on-axis chromatic aberration curve when the zoom lens shown in embodiment 5 is at the telephoto end.

Fig. 45 is a distortion curve when the zoom lens shown in embodiment 5 is at the telephoto end.

Fig. 46 is a schematic view of a zoom lens according to embodiment 6 of the present application in a contracted state.

Fig. 47 is a schematic view of the zoom lens shown in fig. 46 at the wide-angle end and the telephoto end.

Fig. 48 is an astigmatism curve when the zoom lens shown in embodiment 6 is at the wide-angle end.

Fig. 49 is an on-axis chromatic aberration curve when the zoom lens shown in embodiment 6 is at the wide-angle end.

Fig. 50 is a distortion curve when the zoom lens shown in embodiment 6 is at the wide-angle end.

Fig. 51 is an astigmatism curve when the zoom lens shown in embodiment 6 is at the telephoto end.

Fig. 52 is an on-axis chromatic aberration curve when the zoom lens shown in embodiment 6 is at the telephoto end.

Fig. 53 is a distortion curve when the zoom lens shown in embodiment 6 is at the telephoto end.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without any inventive effort, are intended to be within the scope of the application.

Reference herein to "an embodiment" or "implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment or implementation may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

Referring to fig. 1 to 3, the present application provides an electronic device 100, where the electronic device 100 includes a device body 1 and a camera module 2. The device body 1 is provided with an opening K14, and the camera module 2 is arranged in the device body 1 corresponding to the opening K14. The zoom lens 21 of the camera module 2 can be extended or retracted from or into the apparatus body 1 at least partially through the opening K14. When the user needs to shoot, the zoom lens 21 can be controlled to extend out of the device body 1 (as shown in fig. 2) through the opening K14. When the user does not need photographing, the zoom lens 21 can be controlled to retract into the apparatus body 1 through the opening K14 (as shown in fig. 1).

The electronic device 100 may be a mobile phone, a tablet computer, a notebook computer, a wearable device (such as a smart watch, a bracelet, a VR device, etc.), a television, an electronic reader, etc.

The device body 1 refers to a main part of the electronic device 100, and the main part includes electronic components for implementing main functions of the electronic device 100 and a housing for protecting and carrying the electronic components. The device body 1 may include a display screen 11, a middle frame 12, and a rear cover 13 (as shown in fig. 3), where the display screen 11 and the rear cover 13 are both connected to the middle frame 12 and disposed on two opposite sides of the middle frame 12, and the side surfaces of the middle frame 12 are exposed outside the rear cover 13 and the display screen 11.

It should be noted that, according to practical requirements, the camera module 2 may be disposed on any side of the electronic device 100, which is not limited in the present application. Taking a mobile phone as an example, the camera module 2 may be disposed on the front, the back, and the side of the mobile phone. The front surface is the side of the mobile phone provided with the display 11; the back surface is the side of the mobile phone provided with the rear cover 13; the side surface is the peripheral side of the center 12 of the mobile phone. It will be appreciated that the type of electronic device 100 may vary and that the definition of front, back, side, etc. may vary and that other types of electronic devices 100 are not described in detail herein.

Further, the opening K14 may be formed in the rear cover 13. In other embodiments, the opening K14 may also be formed on the display screen 11; alternatively, the opening K14 is formed in the middle frame 12. When the rear cover 13 has the opening K14, the camera module 2 is a rear camera. When the display screen 11 has the opening K14, the camera module is a front camera. It should be understood that the description of the device body 1 in this embodiment is merely an introduction of an application scenario of the camera module 2, and should not be construed as limiting the electronic device 100 provided by the present application.

In the related art, as the pursuit of imaging quality of electronic devices having a photographing function is higher and higher, for example, high image quality and high pixel, it is generally required to design a photosensitive element and a lens in a camera module. For example, with the photosensitive element of the outsole, since the distance between the photosensitive element and the lens is not adjustable, it is necessary to design the distance between the lens and the photosensitive element correspondingly longer. In the case where the Field of view (FOV) is substantially constant, the distance between the lens and the photosensitive element is long, meaning that the overall length of the camera module is also long. When the camera module is applied to the electronic device, the body of the electronic device is thicker and thicker, which is unfavorable for the light and thin of the electronic device. In other words, for the light and thin electronic device, the length of the camera module is limited due to the thickness limitation of the electronic device. When the thickness of the camera module is limited, the distance between the photosensitive element and the lens is not adjustable, so that the distance between the lens in the camera module and the photosensitive element is limited. If the thickness of the designed camera module is thicker, the thickness of the electronic device is thinner, which may cause the camera module to form thicker protrusions on the rear cover of the electronic device. Therefore, when the camera module in the related art is applied to the electronic device, the light and thin electronic device and the compatibility of the camera module with high imaging quality cannot be achieved.

In the electronic device 100 provided by the embodiment of the application, the zoom lens 21 can extend or retract into the device body 1 through the opening K14, so that the camera module 2 has a larger focal length and the thickness of the electronic device 100 is not affected, and the problems of light weight and thinness of the electronic device 100 and incompatibility of high imaging quality of the camera module 2 are solved.

Referring to fig. 4, the present application further provides a camera module 2, where the camera module 2 includes an optical filter 22, a photosensitive element 23, and a zoom lens 21 described in any of the following embodiments. The zoom lens 21, the optical filter 22, and the photosensitive element 23 are sequentially arranged along the optical axis X direction. When shooting, external light passes through the zoom lens 21 and the optical filter 22 in sequence, and finally reaches the photosensitive element 23. The first lens group G1 and the second lens group G2 of the zoom lens 21 are movable relative to the photosensitive element 23 in the optical axis X direction. It should be noted that the structure shown in fig. 4 is only an exemplary illustration, and should not be construed as limiting the present application.

Wherein the zoom lens 21 is used for collecting light of a photographed object and focusing the light on the photosensitive element 23. The filter 22 is used to eliminate unnecessary light to improve the effective resolution and color reproducibility. The filter 22 may be, but is not limited to, an infrared filter 22. The photosensitive element 23 (Sensor), also called a photosensitive chip or an image Sensor, is used to receive the light passing through the filter 22 and convert the light signal into an electrical signal. The photosensitive element 23 may be a charge coupled device (Charge Coupled Device, CCD) or a complementary metal oxide conductor device (Complementary Metal Oxide Semiconductor, CMOS). The photosensitive element 23 has an imaging surface S231, and the imaging surface S231 is a target surface for receiving light on the photosensitive element 23.

The imaging surface S231 and the filter 22 referred to in the embodiments of the zoom lens 21 below are used to assist in describing the positions of the first lens group G1 and the second lens group G2, and are not meant to refer to the zoom lens 21 including the photosensitive element 23 having the imaging surface S231 and the filter 22.

The zoom lens 21 in the above-described camera module 2 is described in detail below with reference to the drawings.

Referring to fig. 5, the present application further provides a zoom lens 21, the zoom lens 21 comprising: the first lens group G1 and the second lens group G2 are arranged along the object side to the image side. Wherein, the object side and the image side refer to respectively: the zoom lens 21 is used as a boundary, the object side is the side where the object is located, and the image side is the side where the image formed by the object is located. Therefore, in photographing, light first passes through the first lens group G1 closer to the object side and then passes through the second lens group G2 closer to the image side.

The first lens group G1 has negative power, and the second lens group G2 has positive power. Wherein the optical power (focalpower) characterizes the ability of the optical system (lens or lens group) to deflect light. In general, the optical power is also the inverse of the focal length of the image side. The optical power of the optical system is positive, indicating that it has a converging effect on the light. The optical power of the optical system is negative, meaning that it has a diverging effect on the light.

The first lens group G1 and the second lens group G2 are each for realizing zooming by moving, and thus may be referred to as a zoom lens group.

Any one of the first lens group G1 and the second lens group G2 is a compensation lens group. That is, the first lens group G1 is a compensation lens group, or the second lens group G2 is a compensation lens group. The compensation lens group is a lens group for compensating the image plane position so that the focal points of the objects to be photographed having different distances fall on the imaging plane S231.

Alternatively, the lens on the most object side of the first lens group G1 has negative power, so that the zoom lens 21 can provide a better imaging effect.

Alternatively, the lens on the most object side of the second lens group G2 has positive power, so that the zoom lens 21 can provide a better imaging effect.

The lens on the most object side of the first lens group G1 refers to the lens closest to the most object side in the first lens group G1. Similarly, the lens on the most object side of the second lens group G2 refers to the lens closest to the most object side in the second lens group G2.

Referring to fig. 6, the zoom lens 21 has a telephoto end and a wide-angle end. The first lens group G1 and the second lens group G2 are each movable in the optical axis X direction to zoom-switch between the telephoto end and the wide-angle end. Here, the telephoto end refers to a state when the focal length of the zoom lens 21 is maximum, and may be referred to as a telescopic state. The wide-angle end refers to a state when the focal length of the zoom lens 21 is minimum, and may also be referred to as a wide-angle state. The first lens group G1 and the second lens group G2 are located at positions different from those of the first lens group G1 and the second lens group G2 when the zoom lens 21 is at the telephoto end. Therefore, the telephoto end and the wide-angle end are two different photographing states of the zoom lens 21, in which the telephoto end is used for telephoto photographing and the wide-angle end is used for wide-angle photographing.

In the related art, at least three lenses including a telescopic lens, a main lens and an ultra-wide angle lens are mounted on a mobile phone. The telescope lens is used for telescopic shooting, the main camera and the ultra-wide angle lens are both used for wide-angle shooting, and the field angle of the main camera is smaller than that of the ultra-wide angle lens. However, the design form firstly causes the whole camera module to have larger volume and also increases the product cost, and in addition, each lens can only be matched with a photosensitive element with a small bottom due to the separate and independent arrangement of the lenses with different purposes, thereby influencing the imaging quality.

In the zoom lens 21 provided in the embodiment of the present application, since both the first lens group G1 and the second lens group G2 are movable in the optical axis X direction, zoom switching of the zoom lens 21 between the telephoto end and the wide-angle end can be achieved by moving the first lens group G1 and the second lens group G2. Compared with the related art, the zoom lens 21 provided in this embodiment is equivalent to integrating the telescopic lens and the main lens, so that the module volume can be reduced, the cost can be reduced, and 5000 ten thousand pixels imaging from the wide-angle end to the telephoto end can be realized by matching the photosensitive element 23 of the outsole (for example, the photosensitive element 23 of 1/1.28inch is adopted), so that the imaging quality can be improved (for example, high pixel shooting is realized, and the signal to noise ratio is reduced).

Alternatively, the wide-angle end of the zoom lens 21 satisfies the relationship: TTLw/ImgH < 2.5 < 4. Where TTLw is the total optical length of the zoom lens 21 at the wide-angle end, imgH is the image height, which is half the diagonal length of the effective pixel area of the imaging surface S231. It should be noted that the optical total length refers to a distance from a surface of the first lens group G1 closest to the object side to the imaging surface S231, and the following description refers to the optical total length.

The TTLw/ImgH may be, but is not limited to, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, etc. For example, TTLw is 20mm and ImgH is 6.450mm; or TTLt is 23.378mm and ImgH is 6.450mm; or TTLt is 23.5mm and ImgH is 6.450mm.

Since the zoom lens 21 satisfies the above relation, the zoom lens 21 can be miniaturized and can effectively maintain good optical performance. It is understood that the miniaturized zoom lens 21 is more suitable for the electronic device 100 having a light and thin requirement, such as a mobile phone.

In the related art, a zoom camera module has been applied to electronic devices such as mobile phones with light and thin requirements. In particular, since the zoom function requires that the lens in the camera module can move relative to the photosensitive element, the overall length of the camera module must be longer, generally greater than the thickness of the electronic device. In order to avoid the electronic equipment being too thick, a periscope type camera is generally adopted at present, and the length direction of the periscope type camera is arranged along the width direction (or the length direction) of the electronic equipment, namely, the length direction of the periscope type camera is perpendicular to the thickness direction of the electronic equipment. The periscope type camera is internally provided with a prism which is used for receiving and reflecting external light rays so as to enable the reflected light rays to propagate along the length direction of the periscope type camera. However, periscopic cameras are suitable for telescopic photographing, but not for wide-angle photographing, because wide-angle photographing requires cameras having a large angle of view, the angle of view increases, the thickness of the prism will also become large, and thus the thickness of the electronic device cannot be satisfied. Further, specifications such as aperture and peripheral brightness are also limited by the thickness of the prism.

In the present application, when the zoom lens 21 is applied to the electronic apparatus 100, the zoom lens 21 can be extended or retracted through the opening K14 on the apparatus body 1 so that the first lens group G1 and the second lens group G2 move with respect to the photosensitive element 23, thereby realizing zooming. In this embodiment, no prism is involved, so that the technical problems associated with the prism described above do not occur. Therefore, the zoom lens 21 provided by the application can improve imaging quality.

Referring to fig. 5, the zoom lens 21 further has a contracted state, and when the zoom lens 21 is in the contracted state, the relationship is satisfied: ctttl < TTLw and ctttl < TTLt. Wherein ctll is the total optical length of the zoom lens 21 in the contracted state, and TTLt is the total optical length of the zoom lens 21 in the telephoto end. In other words, among the above three states, the optical total length ctl when the zoom lens 21 is in the collapsed state is shortest, and the optical total length corresponding to the small Yu Wangyuan end and the wide-angle end is therefore the minimum optical total length of the zoom lens 21. Therefore, when photographing is required by the user, the zoom lens 21 can be controlled to be extended to be switched to the wide-angle end or the telephoto end, and when photographing is not required, the zoom lens 21 can be controlled to be shortened to be switched to the collapsed state. In connection with the electronic apparatus 100 provided in the previous embodiment, when the zoom lens 21 is extended to switch to the wide-angle end or the telephoto end, it protrudes outside the electronic apparatus 100 through the opening K14; when the zoom lens 21 is shortened to switch to the contracted state, the zoom lens 21 is retracted within the electronic apparatus 100.

Further, the zoom lens 21 satisfies: ctttl < TTLt < TTLw. That is, the optical total length TTLw when the zoom lens 21 is at the wide-angle end is larger than the optical total length TTLt when the zoom lens 21 is at the telephoto end, and thus TTLw is the maximum optical total length of the zoom lens 21.

From the zooming perspective, the first lens group G1 and the second lens group G2 move along the optical axis toward the object side during the process of switching the zoom lens 21 from the retracted state to the telephoto end (see fig. 5 and 6). During zooming of the zoom lens 21 from the wide-angle end to the telephoto end, the first lens group G1 moves along the optical axis direction to the image side, and the second lens group G2 moves along the optical axis direction to the object side (see fig. 6).

Optionally, the shrinkage state of the zoom lens satisfies the relation: 1 < cTTL/ImgH < 2. Wherein ctll is the total optical length of the zoom lens 21 in the contracted state, and ImgH is the image height.

Wherein cTTL/ImgH can be, but is not limited to, 1.1, 1.2, 1.24, 1.3, 1.4, 1.5, 1.55, 1.6, 1.7, 1.8, 1.9, etc. For example, cTTL is 10.5mm and ImgH is 6.45mm; or cTTL 9.97mm and ImgH 6.45mm; or cTTL 9.98mm and ImgH 6.45mm.

As can be seen from the above data, when the ImgH has a value of 6.45mm, the maximum optical total length TTLw of the zoom lens 21 is about 20mm, and the minimum optical total length ctlm is about 10mm, so that the zoom lens 21 provided by the present application is applicable to the electronic device 100 with the light and thin requirements, such as a mobile phone. This allows the zoom lens 21 to be miniaturized as well as to effectively maintain good optical performance.

Alternatively, when the zoom lens 21 is in the collapsed state, both the first lens group G1 and the second lens group G2 are located within the apparatus body 1.

Alternatively, when the zoom lens 21 is at the wide-angle end and the telephoto end, the first lens group G1 is at least partially located outside the apparatus body 1, and the second lens group G2 is at least partially located outside the apparatus body.

Referring to fig. 6, the zoom lens further includes a diaphragm 211, where the diaphragm 211 is disposed on the object side of the second lens group G2 or inside the second lens group G2. That is, the stop 211 may be provided outside the second lens group G2, or may be provided between two adjacent lenses in the second lens group G2. The diaphragm 211 and the second lens group G2 move synchronously during zooming of the zoom lens. That is, the aperture stop 211 and the second lens group G2 are relatively fixed, which means that the aperture stop 211 and the second lens group G2 move together. The diaphragm 211 may be fixed to the second lens group G2 or to another member, and is not limited herein. Because the arrangement among the lenses in the second lens group G2 is sparse, and the arrangement among the lenses in the first lens group G1 is tight, the space can be reasonably utilized by arranging the diaphragm 211 and the second lens group G2 together, and the radial dimension of each lens in the second lens group G2 is smaller, so that the diaphragm 211 is easier to be arranged with the second lens group G2 together.

Optionally, referring to fig. 5 and 6, the zoom lens 21 further includes a third lens group G3 having negative power, and the third lens group G3 is fixedly disposed on the image side of the second lens group G2. The third lens group G3 is used for correcting the Chief Ray incidence Angle (CRA) of the wide-Angle end and the telephoto end, the CRA is a parameter of the Sensor, and the light needs to be incident on the Sensor at a required Angle. For the zoom lens 21, CRA at the wide-angle end and CRA at the telephoto end are required to be identical. Accordingly, the arrangement of the third lens group G3 can ensure that the zoom lens 21 has a good imaging quality.

Optionally, the total number of lenses in the first lens group is 2-3, namely 2 or 3 lenses.

Optionally, the total number of lenses in the second lens group is 3-5, that is, 3 lenses, 4 lenses or 5 lenses.

Alternatively, when the zoom lens 21 includes the third lens group G3, the total number of lenses in the third lens group is 1 to 2, i.e., 1 or 2.

For one lens, each of the first lens group G1, the second lens group G2, and the third lens group G3 may be a glass lens or a plastic lens. Each lens may have positive or negative optical power. Further, a surface of the lens close to the object side is referred to as an object side, and a surface of the lens close to the image side is referred to as an image side. The object side surface of each lens in the three lens groups may be a spherical surface, an aspherical surface, or the like, and the image side surface of each lens may be a spherical surface, an aspherical surface, or the like.

Optionally, referring to fig. 7, the number of critical points Q of at least one lens in the zoom lens 21 is greater than or equal to 2. In other words, the zoom lens 21 includes at least one lens having 2 or more critical points Q. The critical point Q refers to a tangent point on the lens surface, except for the intersection point with the optical axis X, which is tangent to a tangent plane perpendicular to the optical axis X. When the lens has 2 or more critical points Q, the shape change of the lens in the radial direction is gentle, so that the thickness of the lens is prevented from being too large, and the occupied space of the lens in the direction of the object side to the image side is reduced, so that the zoom lens 21 is miniaturized, and the application to the electronic device 100 with the light and thin requirement is facilitated.

Optionally, referring to fig. 4, the zoom lens 21 further includes a first carrier 212 and a second carrier 213. The first carrier 212 may be sleeved on the outer periphery of the second carrier 213. The first carrier 212 and the second carrier 213 are each relatively movable in the optical axis X direction. The first lens group G1 is fixed in the first carrier 212. The first carrier 212 is configured to drive the first lens group G1 to move along the optical axis X relative to the photosensitive element 23. The second lens group G2 is fixed in the second carrier 213. The second carrier 213 is used for driving the second lens group G2 to move along the optical axis X relative to the photosensitive element 23. The first carrier 212 may be disposed in the opening K14 of the electronic device 100, and the first carrier 212 and the second carrier 213 may extend or retract the electronic device 100 through the opening K14. Of course, the bearing forms of the first lens group G1 and the second lens group G2 may be other ways, and the structure shown in fig. 4 is only exemplary and should not be construed as limiting the present application.

Optionally, the zoom lens 21 satisfies the relationship: 1 < fw/ImgH < 1.7, wherein fw is the wide-angle end focal length.

fw/ImgH may be, but is not limited to, 1.1, 1.2, 1.3, 1.32, 1.4, 1.5, 1.6, etc. For example, fw is 7mm and ImgH is 6.45mm; or fw is 8.5mm and ImgH is 6.45mm; or fw is 8.6mm and ImgH is 6.45mm.

In the present embodiment, the ratio of the wide-angle end focal length fw to the image height ImgH is set to be greater than 1 and less than 1.7, so that the focal length at the wide-angle end can be ensured to be within the usual focal length range of the mobile phone main camera.

Optionally, the zoom lens 21 satisfies the relationship: -3 < f1/f2 < -1.2, wherein f1 is the focal length of the first lens group and f2 is the focal length of the second lens group.

f1/f2 may be, but is not limited to being, -2.9, -2.8, -2.7, -2.6, -2.5, -2.4, -2.3, -2.2, -2.1, -2, -1.9, -1.8, -1.7, -1.6, -1.5, -1.4, -1.3, etc. For example, f1 is-17.615 mm and f2 is 8.495mm; or f1 is-13.251mm, and f2 is 7.026mm; or f1 is-18.621 mm and f2 is 8.523mm.

In the present embodiment, the ratio of the focal length f1 of the first lens group G1 to the focal length f2 of the second lens group G2 is set to be greater than-3 and smaller than-1.2, so that the focal power relationship of the first lens group G1 and the second lens group G2 can be reasonably distributed, and focusing and zooming can be better realized.

Optionally, the zoom lens 21 satisfies the relationship: 0.05 < Deltad/TTLw < 0.25, wherein Deltad is the distance that the second lens group G2 moves during zooming of the zoom lens 21 from the wide-angle end to the telephoto end.

Δd/TTLw may be, but is not limited to, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, etc. For example, Δd is 1.704 mm and TTLw is 20mm; or Δd is 1.787mm and TTLw is 23.378mm; or Δd is 1.831mm and TTLw is 23.5mm.

In the present embodiment, the ratio of the moving distance of the second lens group G2 from the wide-angle end to the telephoto end to the maximum optical total length TTLw of the zoom lens 21 is reasonably set between 0.05 and 0.25, so that a large magnification ratio can be realized with a small lens group interval variation amount, thereby facilitating the compression of the total length of the zoom lens 21.

Optionally, the zoom lens 21 satisfies the relationship: 1.5< tan (hfoviw)/tan (hfovit), wherein hfoviw is a half angle of view of the zoom lens 21 at the wide angle end, hfovit is a half angle of view of the zoom lens 21 at the telephoto end. Wherein the half-drawing angle refers to half of the Field of view (FOV).

tan (hfoviw)/tan (hfovit) may be, but is not limited to, 1.6, 1.71, 1.8, 1.9, 2.0, 2.1, 2.2, 2.25, etc. For example, hfoviw is 52.806 °, hfovit is 32.913 °; or hfoviw is 43.738 °, hfovit is 26.812 °; or hfoviw is 43.935 °, hfovit is 26.855 °.

In the present embodiment, by setting the ratio of tan (hfovi) to tan (hfovit) to be greater than 1.5, the zoom magnification of the zoom lens 21 is made to be 1.5 times or more.

Optionally, the zoom lens 21 satisfies a relation ft/ENPt < 3, where ft is a focal length of the telephoto end, and ENPt is an entrance pupil diameter of the zoom lens 21 when the zoom lens is at the telephoto end.

The ft/ENPt may be, but is not limited to, 2.9, 2.8, 2.7, 2.6, 2.5, 2.4, 2.3, 2.2, 2.1, 2, 1.9, 1.8, 1.7, 1.6, 1.5, etc. For example, ft is 10.3mm and ENPt is 4.256mm; or ft is 12.5mm and ENPt is 5.208mm; or ft is 12.5mm and ENPt is 5.208mm.

In this embodiment, by setting the ratio of the focal length of the telephoto end to the diameter of the entrance pupil of the telephoto end to be less than 3, the aperture of the telephoto end is made to be 3 or less, so that the brightness and blurring effect of the lens can be improved. The brightness of the lens is improved, and the more light enters the lens, the more clearly the image can be formed at night.

Alternatively, for any of the above embodiments, the total number of lenses N in the zoom lens 21 satisfies: n is more than or equal to 5 and less than or equal to 10. The total number of lenses N may be 5, or 6, or 7, or 8, or 9, or 10. For example, the total number of lenses in the first lens group G1 is 2, the total number of lenses in the second lens group G2 is 4, and the total number of lenses in the third lens group G3 is 0. Alternatively, the total number of lenses in the first lens group G1 is 2, the total number of lenses in the second lens group G2 is 4, and the total number of lenses in the third lens group G3 is 2.

The imaging effect of the zoom lens 21 is better as the number of lenses in the zoom lens is larger. The smaller the number of lenses in the zoom lens, the lower the cost and the smaller the minimum total optical length ctttl. When the total number of lenses N is less than 5, the imaging quality cannot be ensured; when the total number of lenses N is greater than 10, the total optical length of the zoom lens 21 is too large to be applied to the electronic apparatus 100 having the light and thin requirements. The embodiment of the application combines imaging quality and optical total length and selects the total number of lenses to be between 5 and 10, thereby ensuring that the zoom lens 21 has better imaging effect and realizing the beneficial effect of miniaturization of the zoom lens 21.

By using the zoom lens 21 provided by the application, the maximum total optical length TTLw of the zoom lens 21 can be controlled below 26mm (such as 20 mm). The minimum optical total length ctttl of the zoom lens 21 can be controlled below 11mm (e.g. 10 mm). The angle of view at the wide-angle end may be achieved below 90 degrees (e.g., 85 degrees). The field angle at the telephoto end can be realized to be less than 52 degrees. Therefore, the zoom lens 21 provided by the application not only can be well suitable for the electronic equipment 100 with the light and thin requirements, but also has good shooting performance.

The zoom lens 21 provided by the present application is further described below by way of three specific sets of embodiments. In the following embodiments, each aspherical surface calculation formula is:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in the table below); k is the conic coefficient (see table); ai is the i-th order aspherical coefficient.

Example 1

Referring to fig. 5 and 6, fig. 6 (a) is a schematic view of the zoom lens shown in fig. 5 at the wide-angle end. Fig. 6 (b) is a schematic view of the zoom lens shown in fig. 5 at the telephoto end. The zoom lens 21 provided in the present embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged along an object side to an image side. The first lens group G1 includes a first lens L1 and a second lens L2 arranged from an object side to an image side. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged along the object side to the image side. The third lens group G3 includes a seventh lens L7. The zoom lens 21 further includes a stop 211, the stop 211 being disposed between the second lens L2 and the third lens L3.

For specific data on the zoom lens provided in embodiment 1, refer to tables 1 to 5.

Table 1 shows parameters related to each lens, aperture stop, and filter of the zoom lens according to example 1, including a radius of curvature R, a distance d, a refractive index Nd, and an abbe coefficient Vd. Wherein, the units of the curvature radius R and the interval d are millimeter (mm). In table 1, surface numbers 1 to 19 are surfaces of the object, each lens, the aperture, the filter, and the imaging plane, which are marked in this order, in the object-side to image-side direction. The object is referred to as OBJ, the stop is referred to as STO, and the imaging plane is referred to as IMA.

Note that the interval d represents a distance d between the current surface and the subsequent surface along the optical axis. For example, in table 1, the spacing between surface 2 and surface 3 is 0.6, and the spacing between surface 3 and surface 4 is 1.261. For details concerning the interval d, please refer to the explanation here.

Table 2 shows a variable interval d when the zoom lens is changed from the wide-angle end to the telephoto end in embodiment 1, that is, a variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 3 shows the k values and aspherical coefficients of the aspherical mirror surfaces of the lenses in example 1, and table 3 includes table 3a, table 3b, table 3c, and table 3d.

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Table 4 is overall parameter data of the zoom lens in embodiment 1.

Table 5 shows the conditional expressions and corresponding data of the zoom lens according to embodiment 1. N in the table below is the number of lenses.

In the present embodiment, switching of the zoom lens 21 group between the telephoto end, the wide-angle end, and the collapsed state is achieved by changing the interval d1 of the first lens group G1 and the stop 211 along the optical axis X (i.e., the interval distance of the image side surface of the second lens L2 and the stop 211 along the optical axis X), and the interval d2 of the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the interval distance of the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7 along the optical axis X).

Referring to fig. 8 to 10, fig. 8 to 10 show graphs related to the wide-angle end of the zoom lens.

Fig. 8 is an astigmatism curve when the zoom lens is at the wide-angle end in embodiment 1. In the figure, the dashed line represents meridian, the solid line represents sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 9 is an on-axis chromatic aberration curve when the zoom lens is at the wide-angle end in embodiment 1. In the figure, the light wavelength corresponding to the dot line is 656.3nm, the light wavelength corresponding to the solid line is 587.6nm, and the light wavelength corresponding to the dotted line is 486.1nm.

Fig. 10 is a distortion curve when the zoom lens is at the wide-angle end in embodiment 1. The corresponding light wavelength in the figure is 587.6nm.

Referring to fig. 11 to 13, fig. 11 to 13 show graphs related to the telephoto end of the zoom lens.

Fig. 11 is an astigmatism curve when the zoom lens is at the telephoto end in embodiment 1. In the figure, the dashed line represents meridian, the solid line represents sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 12 is an on-axis chromatic aberration curve when the zoom lens is at the telephoto end in embodiment 1. In the figure, the light wavelength corresponding to the dot line is 656.3nm, the light wavelength corresponding to the solid line is 587.6nm, and the light wavelength corresponding to the dotted line is 486.1nm.

Fig. 13 is a distortion curve when the zoom lens is at the telephoto end in embodiment 1. The corresponding light wavelength in the figure is 587.6nm.

As can be seen from fig. 8 to 13, the zoom lens according to embodiment 1 has better imaging quality at both the wide-angle end and the telephoto end.

Example 2

Referring to fig. 14 and 15, fig. 15 (a) is a schematic view of the zoom lens shown in fig. 14 at the wide-angle end. Fig. 15 (b) is a schematic view of the zoom lens shown in fig. 14 at the telephoto end. The zoom lens 21 provided in the present embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged along an object side to an image side. The first lens group G1 includes a first lens L1 and a second lens L2 arranged from an object side to an image side. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged along the object side to the image side. The third lens group G3 includes a seventh lens L7. The zoom lens 21 further includes a stop 211, the stop 211 being disposed between the second lens L2 and the third lens L3.

For specific data on the zoom lens provided in embodiment 2, refer to tables 6 to 10.

Table 6 shows parameters related to each lens, aperture stop, and filter of the zoom lens according to example 2, including radius of curvature R, interval d, refractive index Nd, and abbe coefficient Vd. Wherein, the units of the curvature radius R and the interval d are millimeter (mm). In table 6, surface numbers 1 to 19 are the surfaces of the object, each lens, the aperture, the filter, and the imaging plane, which are marked in this order in the object-side to image-side direction. The object is referred to as OBJ, the stop is referred to as STO, and the imaging plane is referred to as IMA.

Table 7 shows a variable interval d when the zoom lens is changed from the wide-angle end to the telephoto end in embodiment 2, that is, a variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 8 shows the k values and aspherical coefficients of the aspherical mirror surfaces of the lenses in example 2, and table 8 includes table 8a, table 8b, table 8c, and table 8d.

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Table 9 is overall parameter data of the zoom lens in embodiment 2.

Table 10 shows the conditional expressions and corresponding data of the zoom lens according to example 2. N in the table below is the number of lenses.

In the present embodiment, switching of the zoom lens 21 group between the telephoto end, the wide-angle end, and the collapsed state is achieved by changing the interval d1 of the first lens group G1 and the stop 211 along the optical axis X (i.e., the interval distance of the image side surface of the second lens L2 and the stop 211 along the optical axis X), and the interval d2 of the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the interval distance of the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7 along the optical axis X).

Referring to fig. 16 to 18, fig. 16 to 18 show graphs of the wide-angle end of the zoom lens.

Fig. 16 is an astigmatism curve when the zoom lens is at the wide-angle end in embodiment 2. In the figure, the dashed line represents meridian, the solid line represents sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 17 is an on-axis chromatic aberration curve when the zoom lens is at the wide-angle end in embodiment 2. In the figure, the light wavelength corresponding to the dot line is 656.3nm, the light wavelength corresponding to the solid line is 587.6nm, and the light wavelength corresponding to the dotted line is 486.1nm.

Fig. 18 is a distortion curve when the zoom lens is at the wide-angle end in embodiment 2. The corresponding light wavelength in the figure is 587.6nm.

Referring to fig. 19 to 21, fig. 19 to 21 show graphs related to the telephoto end of the zoom lens.

Fig. 19 is an astigmatism curve when the zoom lens is at the telephoto end in embodiment 2. In the figure, the dashed line represents meridian, the solid line represents sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 20 is an on-axis chromatic aberration curve when the zoom lens is at the telephoto end in embodiment 2. In the figure, the light wavelength corresponding to the dot line is 656.3nm, the light wavelength corresponding to the solid line is 587.6nm, and the light wavelength corresponding to the dotted line is 486.1nm.

Fig. 21 is a distortion curve when the zoom lens is at the telephoto end in embodiment 2. The corresponding light wavelength in the figure is 587.6nm.

As can be seen from fig. 16 to 21, the zoom lens given in embodiment 2 has better imaging quality at both the wide-angle end and the telephoto end.

Example 3

Referring to fig. 22 and 23, fig. 23 (a) is a schematic view of the zoom lens shown in fig. 22 at the wide-angle end. Fig. 23 (b) is a schematic view of the zoom lens shown in fig. 22 at the telephoto end. The zoom lens 21 provided in the present embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged along an object side to an image side. The first lens group G1 includes a first lens L1 and a second lens L2 arranged from an object side to an image side. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged along the object side to the image side. The third lens group G3 includes a seventh lens L7. The zoom lens 21 further includes a stop 211, the stop 211 being disposed between the second lens L2 and the third lens L3.

For specific data on the zoom lens provided in embodiment 3, refer to tables 11 to 15.

Table 11 shows parameters related to each lens, aperture stop, and filter of the zoom lens according to example 3, including the radius of curvature R, the interval d, the refractive index Nd, and the abbe coefficient Vd. Wherein, the units of the curvature radius R and the interval d are millimeter (mm). In table 11, surface numbers 1 to 19 are surfaces of the object, each lens, the aperture, the filter, and the imaging plane, which are marked in this order, in the object-side to image-side direction. The object is referred to as OBJ, the stop is referred to as STO, and the imaging plane is referred to as IMA.

Table 12 shows a variable interval d when the zoom lens is changed from the wide-angle end to the telephoto end in embodiment 3, that is, a variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 13 shows the k values and aspherical coefficients of the aspherical mirror surfaces of the lenses in example 3, and table 13 includes table 13a, table 13b, table 13c, and table 13d.

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Table 14 is overall parameter data of the zoom lens in embodiment 3.

Table 15 shows the conditional expressions and corresponding data of the zoom lens according to example 3. N in the table below is the number of lenses.

In the present embodiment, switching of the zoom lens 21 group between the telephoto end, the wide-angle end, and the collapsed state is achieved by changing the interval d1 of the first lens group G1 and the stop 211 along the optical axis X (i.e., the interval distance of the image side surface of the second lens L2 and the stop 211 along the optical axis X), and the interval d2 of the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the interval distance of the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7 along the optical axis X).

Referring to fig. 24 to 26, fig. 24 to 26 show graphs of the wide-angle end of the zoom lens.

Fig. 24 is an astigmatism curve when the zoom lens is at the wide-angle end in embodiment 3. In the figure, the dashed line represents meridian, the solid line represents sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 25 is an on-axis chromatic aberration curve when the zoom lens is at the wide-angle end in embodiment 3. In the figure, the light wavelength corresponding to the dot line is 656.3nm, the light wavelength corresponding to the solid line is 587.6nm, and the light wavelength corresponding to the dotted line is 486.1nm.

Fig. 26 is a distortion curve when the zoom lens is at the wide-angle end in embodiment 3. The corresponding light wavelength in the figure is 587.6nm.

Referring to fig. 27 to 29, fig. 27 to 29 show graphs relating to the telephoto end of the zoom lens.

Fig. 27 is an astigmatism curve when the zoom lens is at the telephoto end in embodiment 3. In the figure, the dashed line represents meridian, the solid line represents sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 28 is an on-axis chromatic aberration curve when the zoom lens is at the telephoto end in embodiment 3. In the figure, the light wavelength corresponding to the dot line is 656.3nm, the light wavelength corresponding to the solid line is 587.6nm, and the light wavelength corresponding to the dotted line is 486.1nm.

Fig. 29 is a distortion curve when the zoom lens is at the telephoto end in embodiment 3. The corresponding light wavelength in the figure is 587.6nm.

As can be seen from fig. 24 to 29, the zoom lens according to embodiment 3 has better imaging quality at both the wide-angle end and the telephoto end.

Example 4

Referring to fig. 30 and 31, fig. 31 (a) is a schematic view of the zoom lens shown in fig. 30 at the wide-angle end. Fig. 31 (b) is a schematic view of the zoom lens shown in fig. 30 at the telephoto end. The zoom lens 21 provided in the present embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged along an object side to an image side. The first lens group G1 includes a first lens L1 and a second lens L2 arranged from an object side to an image side. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged along the object side to the image side. The third lens group G3 includes a seventh lens L7, an eighth lens L8 arranged along the object side to the image side. The zoom lens 21 further includes a stop 211, the stop 211 being disposed between the second lens L2 and the third lens L3.

For specific data on the zoom lens provided in embodiment 4, refer to tables 16 to 20.

Table 16 shows parameters related to each lens, aperture stop, and filter of the zoom lens according to example 4, including radius of curvature R, interval d, refractive index Nd, and abbe coefficient Vd. Wherein, the units of the curvature radius R and the interval d are millimeter (mm). In table 16, surface numbers 1 to 21 are the surfaces of the object, each lens, the aperture, the filter, and the imaging plane, which are marked in this order, in the object-side to image-side direction. The object is referred to as OBJ, the stop is referred to as STO, and the imaging plane is referred to as IMA.

Table 17 shows a variable interval d when the zoom lens is changed from the wide-angle end to the telephoto end in embodiment 4, that is, a variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 18 shows the k values and aspherical coefficients of the aspherical mirror surfaces of the lenses in example 4, and table 18 includes table 18a, table 18b, table 18c, and table 18d.

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Table 19 is overall parameter data of the zoom lens in embodiment 4.

Table 20 shows the conditional expressions and corresponding data of the zoom lens according to example 4. N in the table below is the number of lenses.

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In the present embodiment, switching of the zoom lens 21 group between the telephoto end, the wide-angle end, and the collapsed state is achieved by changing the interval d1 of the first lens group G1 and the stop 211 along the optical axis X (i.e., the interval distance of the image side surface of the second lens L2 and the stop 211 along the optical axis X), and the interval d2 of the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the interval distance of the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7 along the optical axis X).

Referring to fig. 32 to 34, fig. 32 to 34 show graphs of the wide-angle end of the zoom lens.

Fig. 32 is an astigmatism curve when the zoom lens is at the wide-angle end in embodiment 4. In the figure, the dashed line represents meridian, the solid line represents sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 33 is an on-axis chromatic aberration curve when the zoom lens is at the wide-angle end in embodiment 4. In the figure, the light wavelength corresponding to the dot line is 656.3nm, the light wavelength corresponding to the solid line is 587.6nm, and the light wavelength corresponding to the dotted line is 486.1nm.

Fig. 34 is a distortion curve when the zoom lens is at the wide-angle end in embodiment 4. The corresponding light wavelength in the figure is 587.6nm.

Referring to fig. 35 to 37, fig. 35 to 37 show graphs relating to the telephoto end of the zoom lens.

Fig. 35 is an astigmatism curve when the zoom lens is at the telephoto end in embodiment 4. In the figure, the dashed line represents meridian, the solid line represents sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 36 is an on-axis chromatic aberration curve when the zoom lens is at the telephoto end in embodiment 4. In the figure, the light wavelength corresponding to the dot line is 656.3nm, the light wavelength corresponding to the solid line is 587.6nm, and the light wavelength corresponding to the dotted line is 486.1nm.

Fig. 37 is a distortion curve when the zoom lens is at the telephoto end in embodiment 4. The corresponding light wavelength in the figure is 587.6nm.

As can be seen from fig. 32 to 37, the zoom lens according to embodiment 4 has better imaging quality at both the wide-angle end and the telephoto end.

Example 5

Referring to fig. 38 and 39, fig. 39 (a) is a schematic view of the zoom lens shown in fig. 38 at the wide-angle end. Fig. 39 (b) is a schematic view of the zoom lens shown in fig. 38 at the telephoto end. The zoom lens 21 provided in the present embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged along an object side to an image side. The first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3 arranged along an object side to an image side. The second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged along the object side to the image side. The third lens group G3 includes an eighth lens L8. The zoom lens 21 further includes a stop 211, the stop 211 being disposed between the third lens L3 and the fourth lens L4.

For specific data on the zoom lens provided in embodiment 5, refer to tables 21 to 25.

Table 21 shows parameters related to each lens, aperture stop, and filter of the zoom lens according to example 5, including radius of curvature R, interval d, refractive index Nd, and abbe coefficient Vd. Wherein, the units of the curvature radius R and the interval d are millimeter (mm). In table 21, surface numbers 1 to 21 are the surfaces of the object, each lens, the aperture, the filter, and the imaging plane, which are marked in this order, in the object-side to image-side direction. The object is referred to as OBJ, the stop is referred to as STO, and the imaging plane is referred to as IMA.

Table 22 shows a variable interval d when the zoom lens is changed from the wide-angle end to the telephoto end in embodiment 5, that is, a variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 23 shows the k values and aspherical coefficients of the aspherical mirror surfaces of the lenses in example 5, and table 23 includes table 23a, table 23b, table 23c, and table 23d.

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Table 24 is overall parameter data of the zoom lens in embodiment 5.

Table 25 shows the conditional expressions of the zoom lens and the corresponding data in example 5. N in the table below is the number of lenses.

In the present embodiment, switching of the zoom lens 21 group between the telephoto end, the wide-angle end, and the collapsed state is achieved by changing the interval d1 of the first lens group G1 and the stop 211 along the optical axis X (i.e., the interval distance of the image side surface of the third lens L3 and the stop 211 along the optical axis X), and the interval d2 of the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the interval distance of the image side surface of the seventh lens L7 to the object side surface of the eighth lens L8 along the optical axis X).

Referring to fig. 40 to 42, fig. 40 to 42 show graphs of the wide-angle end of the zoom lens.

Fig. 40 is an astigmatism curve when the zoom lens is at the wide-angle end in embodiment 5. In the figure, the dashed line represents meridian, the solid line represents sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 41 is an on-axis chromatic aberration curve when the zoom lens is at the wide-angle end in embodiment 5. In the figure, the light wavelength corresponding to the dot line is 656.3nm, the light wavelength corresponding to the solid line is 587.6nm, and the light wavelength corresponding to the dotted line is 486.1nm.

Fig. 42 is a distortion curve when the zoom lens is at the wide-angle end in embodiment 5. The corresponding light wavelength in the figure is 587.6nm.

Referring to fig. 43 to 45, fig. 43 to 45 show graphs related to the telephoto end of the zoom lens.

Fig. 43 is an astigmatism curve when the zoom lens is at the telephoto end in embodiment 5. In the figure, the dashed line represents meridian, the solid line represents sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 44 is an on-axis chromatic aberration curve when the zoom lens is at the telephoto end in embodiment 5. In the figure, the light wavelength corresponding to the dot line is 656.3nm, the light wavelength corresponding to the solid line is 587.6nm, and the light wavelength corresponding to the dotted line is 486.1nm.

Fig. 45 is a distortion curve when the zoom lens is at the telephoto end in embodiment 5. The corresponding light wavelength in the figure is 587.6nm.

As can be seen from fig. 40 to 45, the zoom lens given in embodiment 5 has better imaging quality at both the wide-angle end and the telephoto end.

Example 6

Referring to fig. 46 and 47, fig. 47 (a) is a schematic view of the zoom lens shown in fig. 46 at the wide-angle end. Fig. 47 (b) is a schematic view of the zoom lens shown in fig. 46 at the telephoto end. The zoom lens 21 provided in the present embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged along an object side to an image side. The first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3 arranged along an object side to an image side. The second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged along the object side to the image side. The third lens group G3 includes an eighth lens L8. The zoom lens 21 further includes a stop 211, the stop 211 being disposed between the third lens L3 and the fourth lens L4.

For specific data on the zoom lens provided in embodiment 6, refer to tables 26 to 30.

Table 26 shows parameters related to each lens, aperture stop, and filter of the zoom lens according to example 6, including radius of curvature R, interval d, refractive index Nd, and abbe coefficient Vd. Wherein, the units of the curvature radius R and the interval d are millimeter (mm). In table 26, surface numbers 1 to 21 are the surfaces of the object, each lens, the aperture, the filter, and the imaging plane, which are marked in this order, in the object-side to image-side direction. The object is referred to as OBJ, the stop is referred to as STO, and the imaging plane is referred to as IMA.

Table 27 is a variable interval d when the zoom lens is changed from the wide-angle end to the telephoto end in embodiment 6, that is, a variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 28 is the k value and aspherical coefficient of each lens in example 6, and table 28 includes table 28a, table 28b, table 28c, table 28d, and table 28e.

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Table 29 is overall parameter data of the zoom lens in embodiment 6.

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Table 30 shows the conditional expressions and corresponding data of the zoom lens according to example 6. N in the table below is the number of lenses.

In the present embodiment, switching of the zoom lens 21 group between the telephoto end, the wide-angle end, and the collapsed state is achieved by changing the interval d1 of the first lens group G1 and the stop 211 along the optical axis X (i.e., the interval distance of the image side surface of the third lens L3 and the stop 211 along the optical axis X), and the interval d2 of the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the interval distance of the image side surface of the seventh lens L7 to the object side surface of the eighth lens L8 along the optical axis X).

Referring to fig. 48 to 50, fig. 48 to 50 show graphs related to the wide-angle end of the zoom lens.

Fig. 48 is an astigmatism curve when the zoom lens is at the wide-angle end in embodiment 6. In the figure, the dashed line represents meridian, the solid line represents sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 49 is an on-axis chromatic aberration curve when the zoom lens is at the wide-angle end in embodiment 6. In the figure, the light wavelength corresponding to the dot line is 656.3nm, the light wavelength corresponding to the solid line is 587.6nm, and the light wavelength corresponding to the dotted line is 486.1nm.

Fig. 50 is a distortion curve when the zoom lens is at the wide-angle end in embodiment 6. The corresponding light wavelength in the figure is 587.6nm.

Referring to fig. 51 to 53, fig. 51 to 53 show graphs related to the telephoto end of the zoom lens.

Fig. 51 is an astigmatism curve when the zoom lens is at the telephoto end in embodiment 6. In the figure, the dashed line represents meridian, the solid line represents sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 52 is an on-axis chromatic aberration curve when the zoom lens is at the telephoto end in embodiment 6. In the figure, the light wavelength corresponding to the dot line is 656.3nm, the light wavelength corresponding to the solid line is 587.6nm, and the light wavelength corresponding to the dotted line is 486.1nm.

Fig. 53 is a distortion curve when the zoom lens is at the telephoto end in embodiment 6. The corresponding light wavelength in the figure is 587.6nm.

As can be seen from fig. 48 to 53, the zoom lens given in embodiment 6 has better imaging quality at both the wide-angle end and the telephoto end.

While embodiments of the present application have been shown and described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and alternatives to the above embodiments may be made by those skilled in the art within the scope of the application, which is also to be regarded as being within the scope of the application.

Claims (18)

1. A zoom lens, characterized in that the zoom lens comprises: a first lens group and a second lens group arranged along an object side to an image side; the first lens group has negative focal power, and the second lens group has positive focal power; the zoom lens has a telephoto end and a wide-angle end, and the first lens group and the second lens group are each movable in an optical axis direction to zoom-switch between the telephoto end and the wide-angle end; the critical point number of at least one lens in the zoom lens is more than or equal to 2; the wide-angle end of the zoom lens satisfies the relation: TTLw/ImgH is less than 2.5 and less than 4; wherein TTLw is the total optical length of the zoom lens at the wide-angle end, and ImgH is the image height.

2. The zoom lens of claim 1, wherein the zoom lens further has a collapsed state, the relationship being satisfied when the zoom lens is in the collapsed state: ctll < TTLw and ctll < TTLt, where ctll is the total optical length of the zoom lens when in the contracted state, and TTLt is the total optical length of the zoom lens when in the telescopic end.

3. The zoom lens according to claim 2, wherein a contracted state of the zoom lens satisfies a relation: 1 < cTTL/ImgH < 2.

4. The zoom lens according to claim 2, wherein the first lens group and the second lens group move in an object-side direction along an optical axis in a process of switching the zoom lens from the collapsed state to the telephoto end.

5. The zoom lens according to claim 1, wherein the first lens group moves toward the image side along the optical axis and the second lens group moves toward the object side along the optical axis during zooming of the zoom lens from the wide-angle end to the telephoto end.

6. The zoom lens according to claim 1, further comprising a diaphragm provided on an object side of the second lens group or inside the second lens group, wherein the diaphragm and the second lens group move in synchronization during zooming of the zoom lens.

7. The zoom lens according to claim 1, further comprising a third lens group having negative power, the third lens group being fixedly disposed on an image side of the second lens group.

8. The zoom lens of claim 7, wherein the total number of lenses in the third lens group is 1-2.

9. The zoom lens according to any one of claims 1 to 8, wherein the total number of lenses in the first lens group is 2 to 3; and/or the total number of lenses in the second lens group is 3-5.

10. The zoom lens according to any one of claims 1 to 8, wherein the zoom lens satisfies the relation: 1 < fw/ImgH < 1.7, wherein fw is the wide-angle end focal length.

11. The zoom lens according to any one of claims 1 to 8, wherein the zoom lens satisfies the relation: -3 < f1/f2 < -1.2, wherein f1 is the focal length of the first lens group and f2 is the focal length of the second lens group.

12. The zoom lens according to any one of claims 1 to 8, wherein the zoom lens satisfies the relation: 0.05 < Deltad/TTLw < 0.25, wherein Deltad is the distance that the second lens group moves during zooming of the zoom lens from the wide-angle end to the telephoto end.

13. The zoom lens according to any one of claims 1 to 8, wherein the zoom lens satisfies the relation: 1.5< tan (hfoviw)/tan (hfovit), wherein hfoviw is a half angle of view of the zoom lens at a wide angle end, hfovit is a half angle of view of the zoom lens at a telephoto end.

14. The zoom lens according to any one of claims 1 to 8, wherein the zoom lens satisfies a relation ft/ENPt < 3, where ft is a focal length of the telephoto end and ENPt is an entrance pupil diameter when the zoom lens is at the telephoto end.

15. A zoom lens according to any one of claims 1 to 8, wherein the lens on the most object side of the first lens group has negative optical power and/or the lens on the most object side of the second lens group has positive optical power.

16. The zoom lens according to any one of claims 1 to 8, wherein the total number of lenses N in the zoom lens satisfies: n is more than or equal to 5 and less than or equal to 10.

17. A camera module, characterized in that the camera module comprises an optical filter, a photosensitive element and the zoom lens according to any one of claims 1-16, wherein the zoom lens, the optical filter and the photosensitive element are sequentially arranged along the optical axis direction, and the first lens group and the second lens group of the zoom lens can move along the optical axis direction relative to the photosensitive element.

18. An electronic device, wherein the electronic device comprises a device body and the camera module according to claim 17, the device body has an opening, the camera module is disposed in the device body corresponding to the opening, and a zoom lens of the camera module can extend or retract from the device body at least partially through the opening.