Lens and shooting device

Abstract

The invention discloses a lens and a shooting device, and belongs to the technical field of electronic equipment. The lens comprises a first lens group, a second lens group, a third lens group and a lens barrel, the first lens group and the third lens group are both fixedly installed on the lens barrel, and the second lens group is located between the first lens group and the third lens group. In the optical axis direction of the lens, the second lens group is movably installed on the lens barrel, the second lens group has a first position and a second position, under the condition that the second lens group is located at the first position, the distance between the second lens group and the first lens group is a first distance, and under the condition that the second lens group is located at the second position, the distance between the second lens group and the second lens group is a second distance. When the first lens group is located at the first position, the first focal length of the camera module is ft, when the second lens group is located at the second position, the distance between the second lens group and the first lens group is a second distance, the second focal length of the camera module is fw, the second distance is larger than the first distance, and ft > fw > fs.

Description

Technical Field

[0001] This application belongs to the field of photography technology, specifically relating to a lens and a shooting device. Background Technology

[0002] With the continuous development of technology, the shooting performance of mobile phones and other electronic devices has become increasingly powerful. In addition, due to the good portability and easy operation of electronic devices, users are using mobile phones and other electronic devices to take pictures in more and more widespread scenarios.

[0003] In electronic devices, the focal length of the camera module is limited by the physical size of the device, such as a mobile phone, resulting in poor image clarity when shooting distant objects. To address this, related technologies propose equipping electronic devices with lenses to increase the focal length of the camera module.

[0004] However, in the related technologies, once the lens is installed on the electronic device, the focal length increment of the camera module is a fixed value. In this case, if the user needs to appropriately increase the shooting angle, the lens has to be removed from the electronic device, which results in a poor user experience for the lens in the related technologies. Summary of the Invention

[0005] The purpose of this application is to provide a lens and shooting device that can solve the problem in the related art where the increment of the focal length of the lens relative to the camera module is a fixed value, and thus the lens has to be removed when the user needs to increase the shooting angle, which will have an adverse impact on the user experience.

[0006] In a first aspect, embodiments of this application provide a lens that is detachably mounted on an electronic device, wherein the focal length of the camera module of the electronic device is fs, wherein... The lens includes a first lens group, a second lens group, a third lens group, and a lens barrel. The first lens group and the third lens group are both fixedly mounted on the lens barrel, and the second lens group is located between the first lens group and the third lens group. In the optical axis direction of the lens, the second lens group is movably mounted on the lens barrel, and the second lens group has a first position and a second position. When the second lens group is in the first position, the distance between the second lens group and the first lens group is a first distance, and the first focal length of the camera module is ft. When the second lens group is in the second position, the distance between the second lens group and the first lens group is a second distance, and the second focal length of the camera module is fw. The second distance is greater than the first distance, and ft > fw > fs.

[0007] Secondly, embodiments of this application also provide a shooting device, which includes an electronic device and the aforementioned lens. The electronic device includes a device body and a camera module, and the camera module is mounted on the device body. The lens is detachably mounted on the device body, and the lens is docked with the camera module.

[0008] This application discloses a lens comprising a first lens group, a second lens group, and a third lens group arranged sequentially along the optical axis. The first lens group and the third lens group are both fixedly installed in the lens barrel, and the second lens group is movably connected to the lens barrel along the optical axis. The second lens group has a first position and a second position, which allows the degree of increase in the focal length of the lens for the camera module of the electronic device to vary.

[0009] In the first position, the distance between the second lens group and the first lens group is the first distance, and the first focal length of the camera module equipped with the lens is ft. In the second position, the distance between the second lens group and the first lens group is the second distance, and the second focal length of the camera module equipped with the lens is fw. The second distance is greater than the first distance, and ft > fw. This allows the user to move the second lens group in the lens of the electronic device to the first position when shooting at a distant location, so that the lens has a relatively larger magnification. Correspondingly, when the user needs to shoot at a closer location and needs to obtain a larger shooting angle range, the second lens group in the lens of the electronic device can be moved to the second position to reduce the magnification of the lens and increase the shooting range of the camera module.

[0010] Of course, when the second lens group is in the second position, it can also increase the focal length of the camera module, that is, fw > fs. When the electronic device is not equipped with the lens disclosed in the embodiments of this application, the focal length of the camera module of the electronic device is fs, so as to ensure that the lens disclosed in the embodiments of this application always has the ability to increase the focal length of the camera module.

[0011] Furthermore, in the lens disclosed in this application, since both the first lens group and the third lens group are fixed relative to the lens barrel, and since the second lens group has only two specific zoom positions, the corresponding moving components of the lens can be simplified, the overall tolerance of the lens can be reduced, the assembly and manufacturing difficulty of the lens can be reduced, and the overall cost can be reduced accordingly. Attached Figure Description

[0012] Figure 1 This is an assembly diagram of the lens in the first position as disclosed in the embodiments of this application; Figure 2 This is an assembly diagram of the lens in the second position as disclosed in the embodiments of this application; Figure 3 This is a schematic diagram of the optical path when the second lens group in the lens disclosed in the embodiments of this application is in the first position; Figure 4 This is a schematic diagram of the optical path when the second lens group in the lens disclosed in the embodiments of this application is in the second position; Figure 5 This is a schematic diagram of a specific structure of the lens disclosed in an embodiment of this application; Figure 6 This is an MTF curve of the imaging device when the second lens group in the lens disclosed in the embodiments of this application is in the first position; Figure 7 This is an MTF curve diagram of the imaging device when the second lens group in the lens disclosed in the embodiments of this application is in the second position.

[0013] Explanation of reference numerals in the attached figures: 10 - First lens group, 20 - Second lens group, 30 - Third lens group, 40 - Camera module 101-First lens, 102-Second lens, 103-Third lens, 104-Fourth lens, 105-Fifth lens, 106-Sixth lens, 107-Seventh lens, 108-Eighth lens, 109-Ninth lens, 110-Tenth lens, 111-Eleventh lens, 112-Twelfth lens, 113-Thirteenth lens, 114-Fourteenth lens, 115-Fifteenth lens, 116-Sixteenth lens, 117-Seventeenth lens. Detailed Implementation

[0014] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0015] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0016] like Figures 1-5As shown in the embodiment of this application, a lens is provided that can be used as an external device with electronic devices such as mobile phones. Therefore, the lens disclosed in this application embodiment can be detachably installed on electronic devices. Thus, when a user takes an image from a distant location and the electronic device cannot form an image with sufficient clarity using only its own camera module 40, the lens can be installed on the electronic device and configured to dock with the camera module 40 of the electronic device. This allows the lens to provide light distribution for the light entering the camera module 40 and to increase the focal length of the camera module 40.

[0017] In this application, the lens disclosed is a focusless system, where parallel light entering the lens can still exit as parallel light. However, to ensure that the lens disclosed in this application has the ability to increase the focal length of the camera module 40, in this application, the parallel light entering the lens can be completely focused by the lens.

[0018] In detail, such as Figure 1 and Figure 2 As shown, the lens disclosed in this application includes a first lens group 10, a second lens group 20, a third lens group 30, and a lens barrel (not shown in the figure), wherein the first lens group 10, the second lens group 20, and the third lens group 30 each include at least one lens. To reduce the manufacturing difficulty of each lens, optionally, the first lens group 10, the second lens group 20, and the third lens group 30 each include two or more lenses.

[0019] Furthermore, in this embodiment, both the first lens group 10 and the third lens group 30 are fixedly mounted on the lens barrel, and the second lens group 20 is located between the first lens group 10 and the third lens group 30. More specifically, during the use of the lens, the first lens group 10 is the lens closest to the object being photographed, and correspondingly, the third lens group 30 is the lens closest to the electronic device. In other words, in this application, the first lens group 10 can be considered as the objective lens group, and the third lens group 30 can be considered as the eyepiece group.

[0020] As mentioned above, in related technologies, lenses are typically fixed-focus devices, which forces users to detach the lens from the electronic device when they need to appropriately widen the shooting angle, thus negatively impacting the user experience. To address the aforementioned problems, this application proposes a lens including the following technical solution.

[0021] Among them, such as Figure 1 and Figure 2As shown, in the optical axis direction of the lens, the second lens group 20 is movably mounted on the lens barrel, thereby allowing the second lens group 20 to move relative to the lens barrel (and the first lens group 10 and the third lens group 30), thus changing the focal length of the camera module 40 equipped with the lens. For ease of description, the camera module 40 equipped with the lens will be referred to as the shooting device below, and the focal length of the shooting device is the same as the focal length of the camera module 40 equipped with the lens. Correspondingly, the focal length fs of the camera module 40 is the original focal length of the camera module 40 itself when it is not equipped with a lens.

[0022] In this application, based on the logic that when the zoom group in the Kepler architecture moves linearly in the same direction continuously, the movement of the compensation group is usually a reciprocating motion, the inventors creatively propose a scheme to set the compensation group in the lens as a fixed structure and to determine the actual position parameters of the zoom group based on the corresponding position parameters of the compensation group and the zoom group during linear zoom.

[0023] In detail, within the Keplerian framework, to ensure that the emitted light is always parallel, the position of the compensation group needs to be adjusted accordingly as the zoom group moves. More intuitively, during continuous zooming as the zoom group gradually moves from the object side towards the viewfinder side, the compensation group typically first moves towards the object side, and then moves away from the object side. Therefore, when the compensation group is in a certain position, the zoom group usually has two corresponding positions that ensure the emitted light is parallel.

[0024] Based on the above technical principles, in this application, as Figure 3 and Figure 4 As shown, in order to ensure that the camera module 40 can still image normally, the second lens group 20 has a first position and a second position. When the second lens group 20 is in the first position, the distance between the second lens group 20 and the first lens group 10 is the first distance, and the first focal length of the camera module 40 is ft. When the second lens group 20 is in the second position, the distance between the second lens group 20 and the first lens group 10 is the second distance, and the second focal length of the camera module 40 is fw. The second distance is greater than the first distance, and ft > fw > fs.

[0025] Furthermore, the focal length of the camera module 40 is the focal length of the shooting device formed by the lens attached to the camera module 40, and the distance between the second lens group 20 and the first lens group 10 is the distance between them in the optical axis direction. That is, in this application, the second lens group 20, which is in the first position, can move away from the first lens group 10 along the optical axis direction to the second position, thereby changing the increment of the focal length of the lens relative to the camera module 40.

[0026] As described above, in this embodiment, the position of the second lens group 20 relative to the first lens group 10 can be switched to change the degree to which the lens increases the focal length of the camera module 40. Furthermore, compared to the case where the second lens group 20 is in the second position, the effect of increasing the focal length of the camera module 40 is stronger when the second lens group 20 is in the first position. Of course, regardless of whether the second lens group 20 is in the first or second position, the lens has the ability to increase the focal length of the camera module 40.

[0027] Furthermore, in this application, the specific parameters of the first and second positions of the second lens group 20 can be determined based on the actual structural parameters of the first lens group 10, the second lens group 20, and the third lens group 30. Of course, it needs to be determined that, given the structural parameters of the aforementioned three, the actual values ​​of the first and second positions of the second lens group 20 are related to and correspond to the actual position of the third lens group 30, so that when the second lens group 20 is located in the first and second positions respectively, the light emitted from the lens can be guaranteed to be a parallel beam.

[0028] In this embodiment of the application, the second lens group 20 may include multiple lenses. Therefore, during the assembly of the second lens group 20 and the lens barrel, all the lenses in the second lens group 20 may be pre-assembled as a whole. For example, the second lens group 20 may include a housing and multiple lenses. After all the lenses of the second lens group 20 are fixedly installed in the housing, the housing and the lens barrel are then assembled together, and the housing and the lens barrel are made to form a movable fit relationship in the aforementioned optical axis direction, so as to ensure that the second lens group 20 can move as a whole relative to the lens barrel in the direction of the optical axis.

[0029] Of course, when both the first lens group 10 and the third lens group 30 include multiple lenses, the multiple lenses can be installed on opposite sides of the second lens group 20 in a one-to-one correspondence based on the positional parameters between the multiple lenses of the first lens group 10 and the third lens group 30. Alternatively, referring to the second lens group 20, the multiple lenses of the first lens group 10 and the third lens group 30 can be pre-assembled into a single unit, and then this integrated structure of the first lens group 10 and the third lens group 30 can be fixedly installed in the corresponding positions in the lens barrel.

[0030] This application discloses a lens comprising a first lens group 10, a second lens group 20, and a third lens group 30 arranged sequentially along the optical axis. The first lens group 10 and the third lens group 30 are both fixedly installed in the lens barrel. The second lens group 20 is movably connected to the lens barrel along the optical axis and has a first position and a second position, which allows the degree of increase in the focal length of the lens for the camera module 40 of the electronic device to vary.

[0031] When the second lens group 20 is in the first position, the distance between the second lens group 20 and the first lens group 10 is the first distance, and the first focal length of the camera module 40 equipped with the lens is ft. When the second lens group 20 is in the second position, the distance between the second lens group 20 and the first lens group 10 is the second distance, and the second focal length of the camera module 40 equipped with the lens is fw. The second distance is greater than the first distance, and ft > fw. This allows the user to move the second lens group 20 in the lens of the electronic device to the first position when they need to shoot from a distant location, so that the lens has a relatively larger magnification. Correspondingly, when the user needs to shoot from a closer location and needs to obtain a larger shooting angle range, the second lens group 20 in the lens of the electronic device can be moved to the second position to reduce the magnification of the lens and increase the shooting range of the camera module 40.

[0032] Of course, when the second lens group 20 is in the second position, it can also increase the focal length of the camera module 40, that is, fw > fs. When the electronic device is not equipped with the lens disclosed in the embodiments of this application, the focal length of the camera module 40 of the electronic device is fs, so as to ensure that the lens disclosed in the embodiments of this application always has the ability to increase the focal length of the camera module 40.

[0033] Furthermore, in the lens disclosed in this application, since the first lens group 10 and the third lens group 30 are both fixed relative to the lens barrel, and since the second lens group 20 has only two specific zoom positions, the corresponding moving components of the lens can be simplified, the overall tolerance of the lens can be reduced, the assembly and manufacturing difficulty of the lens can be reduced, and the overall cost can be reduced accordingly.

[0034] To balance the magnification of the lens with its overall structural dimensions, the magnification can be designed. In one specific embodiment of this application, 1.3 ≤ fw / fs ≤ 1.9 can be used. This allows the lens to significantly increase the focal length of the camera module 40 of the electronic device, and also ensures that the diameters of the lenses in each of the multiple lens groups (including the first lens group 10, the second lens group 20, and the third lens group 30) and the dimensions of each lens group in the optical axis direction are moderate. This prevents the diameter and length of the lens from being too large, which would have a significant adverse impact on the ease of use of the lens. Here, fw / fs is the ratio of the two.

[0035] As described above, this application proposes an embodiment of the minimum magnification range of a lens relative to the focal length of a camera module 40. Optionally, this application also proposes a scheme that limits the range of the ratio between the maximum and minimum magnification of the lens.

[0036] Specifically, in the embodiments of this application, 1.5 ≤ ft / fw ≤ 2.3 can be used. By adopting the aforementioned technical solution, the lens achieves a more considerable magnification, thereby increasing the focal length of mobile phones and other electronic devices. This allows the camera module 40 to capture images from more distant locations by using the lens, thus showcasing the lens's assisting effect on electronic devices in telephoto scenes to a greater extent. Simultaneously, by adopting the aforementioned technical solution, the length and maximum diameter of the lens are also made relatively appropriate to ensure ease of use when the lens is used with mobile phones and other electronic devices. This can further increase the frequency of lens use, thereby significantly increasing the product's popularity.

[0037] As described above, after light enters the lens disclosed in this application embodiment, the multiple lens groups in the lens can provide a converging effect for parallel light, and ensure that the converged light is still emitted in a parallel state, thereby enabling the lens to increase the focal length of the camera module 40 of the electronic device. In order for the lens to produce the above-mentioned technical effects, it is necessary to design the parameters, positions and distribution of the lenses in the multiple lens groups in the lens so that the corresponding combination of the lens groups in the lens can emit parallel light.

[0038] To ensure that the number of lenses in each lens group is not too different and that the diameter of each lens in each lens group is as similar as possible, resulting in a more symmetrical overall lens structure, the ratio of focal lengths between the multiple lens groups can be restricted. Based on this, in a specific embodiment of this application, the focal length of the first lens group 10 can be f1, the focal length of the second lens group 20 can be f2, and the focal length of the third lens group 30 can be f3. Simultaneously, 2.5 ≤ f1 / f2 ≤ 3 and 2.3 ≤ f1 / f3 ≤ 2.8 can be maintained. Under these conditions, the lens can balance magnification and structural size, further improving the user experience. Here, f1 / f2 is the ratio of f1 to f2, and f1 / f3 is the ratio of f1 to f3.

[0039] In order to minimize chromatic aberration in the image formed by the camera module 40 in conjunction with the lens, in one specific embodiment of this application, the multiple lens groups in the lens may include at least one low-dispersion lens to correct chromatic aberration.

[0040] The low-dispersion lens can be included in any one of the first lens group 10, the second lens group 20 and the third lens group 30. In order to further improve the chromatic aberration correction effect, in a specific embodiment of this application, the objective lens group in the lens can include at least one low-dispersion lens.

[0041] In detail, as described above, in this application, the first lens group 10 is the lens group that is furthest from the electronic device in the lens. That is, in the lens, the first lens group 10 is located on the side of the third lens group 30 that is farthest from the electronic device. In the embodiments of this application, the first lens group 10 can include multiple lenses, and the dispersion coefficient (i.e., Abbe number) of at least one of the multiple lenses is greater than or equal to 60, so as to ensure that the lens has a good chromatic aberration correction effect.

[0042] In a further embodiment of this application, at least two lenses in the first lens group 10 may be low-dispersion lenses to further improve the chromatic aberration correction effect of the first lens group 10.

[0043] In a further embodiment of this application, the dispersion coefficient of the low-dispersion lens in the first lens group 10 can be greater than or equal to 65, which can further improve the chromatic aberration correction effect of the first lens group 10.

[0044] Based on the above embodiments, in one specific embodiment of this application, the first lens group 10 may include at least three lenses, wherein at least two lenses are low-dispersion lenses, and the dispersion coefficients of the aforementioned at least two low-dispersion lenses are both greater than or equal to 65. Furthermore, the refractive index of the aforementioned at least two low-dispersion lenses may be less than or equal to 1.6 to further improve the chromatic aberration correction effect of the lenses.

[0045] Of course, in other embodiments of this application, at least one of the plurality of lenses in each of the second lens group 20 and the third lens group 30 may be a low-dispersion lens, which is not limited herein.

[0046] As described above, the first lens group 10, the second lens group 20 and the third lens group 30 can each include multiple lenses, and the multiple lenses in each lens group can be fixed in the lens barrel in a one-to-one correspondence. Alternatively, the multiple lenses in each lens group can be pre-formed into a fixed relationship, such as pre-fixing multiple lenses in the housing and then installing them together in the lens barrel.

[0047] As described above, multiple lenses can be installed individually and sequentially during the mounting process of the housing or lens barrel. That is, in one specific embodiment of this application, the multiple lenses in each lens group can be independent and separate from each other. To enable the lens group to provide better optical performance, reduce aberrations, and improve light transmittance, in another embodiment of this application, at least two of the multiple lenses can be cemented together to form a cemented lens. Of course, during the cementing process of two adjacent lenses, a highly transparent optical adhesive is required to prevent the cementing material from adversely affecting the overall optical performance of the lens.

[0048] Based on the above, and considering that the second lens group 20 has a significant impact on aberrations in the lens, in a specific embodiment of this application, the second lens group 20 may include multiple lenses, and at least two of the multiple lenses in the second lens group 20 may be cemented together to form a cemented lens.

[0049] Of course, in other embodiments of this application, at least two of the plurality of lenses in the first lens group 10 and the third lens group 30 may be cemented lenses, which is not limited herein.

[0050] In order to enable the lens of this application to correct field curvature and distortion, in one specific embodiment of this application, at least one of the multiple lens groups in the lens may be an aspherical lens.

[0051] Furthermore, in the lens disclosed in the embodiments of this application, since the third lens group 30 is the lens group closest to the camera module 40, that is, in this application, the third lens group 30 is located on the side of the first lens group 10 closer to the electronic device, and the third lens group 30 can include multiple lenses, wherein at least one of the multiple lenses of the third lens group 30 is an aspherical lens.

[0052] Of course, in other embodiments of this application, at least one of the plurality of lenses in the first lens group 10 and the second lens group 20 may be an aspherical lens, which is not limited herein.

[0053] Furthermore, in this embodiment, the aspherical lens is an even-order aspherical structure, which satisfies the following aspherical formula for aspherical surfaces:

[0054] Where Z is the sag of the surface parallel to the optical axis, C is the curvature of the lens surface (where curvature is the reciprocal of the radius of curvature), K is the conic constant, and A, B, C, D, E, F, G, and H are aspherical coefficients.

[0055] More specifically, such as Figure 5 As shown, the first lens group 10 of the lens in this application can include a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, and a sixth lens 106. At the same time, among the multiple lenses in the first lens group 10, the optical power of the first lens 101, the third lens 103, and the fifth lens 105 can be positive, while the optical power of the second lens 102, the fourth lens 104, and the sixth lens 106 can be negative.

[0056] By adopting the above technical solution, the first lens group 10 has a relatively large focal length, so that the magnification of the entire lens relative to the focal length of the camera module 40 is relatively large. At the same time, by adopting the above technical solution, the dimensions of the first lens group 10 in the optical axis direction and in the direction perpendicular to the optical axis direction are not too large, so as to minimize the maximum length and diameter of the lens.

[0057] In the above embodiments, the first lens 101 and the third lens 103 in the first lens group 10 can be low dispersion lenses, that is, their refractive index nd≤1.6 and their Abbe number vd≥65.

[0058] Based on the above-described embodiment where the first lens group 10 includes a first lens 101, etc., further, as Figure 5 As shown, the second lens group 20 can include a seventh lens 107, an eighth lens 108, a ninth lens 109, a tenth lens 110, an eleventh lens 111, a twelfth lens 112, and a thirteenth lens 113. Furthermore, the optical power of the seventh lens 107, the eighth lens 108, the eleventh lens 111, the twelfth lens 112, and the thirteenth lens 113 can be positive, while the optical power of the ninth lens 109 and the tenth lens 110 can be negative.

[0059] By adopting the above technical solution, the total number of lenses in the second lens group 20 can be relatively small, and the magnification range of the focal length of the camera module 40 can be relatively large when the second lens group 20 switches between the first position and the second position, so as to further improve the user experience of the lens.

[0060] In the above embodiments, the eighth lens 108 and the ninth lens 109 in the second lens group 20 can be cemented lenses, and the tenth lens 110 and the eleventh lens 111 can also be cemented lenses.

[0061] Based on the embodiment where the first lens group 10 includes the aforementioned first lens 101, and the second lens group 20 includes the aforementioned seventh lens 107, further, as Figure 5 As shown, in the lens disclosed in this application embodiment, the third lens group 30 can include a fourteenth lens 114, a fifteenth lens 115, a sixteenth lens, and a seventeenth lens 117. Furthermore, the optical power of the fourteenth lens 114, the fifteenth lens 115, and the seventeenth lens 117 can be positive, while the optical power of the sixteenth lens can be negative. By adopting the above technical solution, the third lens group 30 can achieve relatively better light resolution.

[0062] Furthermore, in the above embodiments, the seventeenth lens 117 can be an aspherical lens.

[0063] Based on the lenses disclosed in the above embodiments, in a specific solution of this application: as follows: Figure 5 As shown, this allows ft / fw = 1.98 and fw / fs = 1.78; At the same time, make f1 / f2 = 2.8; and f1 / f3 = 2.5; In addition, the first lens group 10 includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, and a sixth lens 106; the second lens group 20 includes a seventh lens 107, an eighth lens 108, a ninth lens 109, a tenth lens 110, an eleventh lens 111, a twelfth lens 112, and a thirteenth lens 113; and the third lens group 30 includes a fourteenth lens 114, a fifteenth lens 115, a sixteenth lens, and a seventeenth lens 117.

[0064] Based on the above structure, the first lens 101 and the third lens 103 in the first lens group 10 can both be low dispersion lenses. The refractive index and Abbe number of the first lens 101 are nd1=1.59 and vd1=68.3, respectively; the refractive index and Abbe number of the third lens 103 are nd3=1.57 and vd3=71.3, respectively.

[0065] Furthermore, the seventeenth lens 117 in the third lens group 30 can be an aspherical lens, with the surface of the seventeenth lens 117 closest to the sixteenth lens being the first surface s1, and the surface of the seventeenth lens 117 away from the sixteenth lens being the second surface s2. The aspherical coefficient of the aspherical lens of this application is shown below:

[0066] Based on the proportional relationships between focal lengths in the lens disclosed in the above embodiments, this application provides specific lens parameters, wherein:

[0067] Based on the specific parameters of the lenses mentioned above, in this application, the focal lengths of the first lens group 10, the second lens group 20, and the third lens group 30, as well as the focal length and other parameters of the shooting device composed of the lens and the camera module 40 of the electronic device, are as follows:

[0068] In the table above, EFL is the system focal length, Fno is the system aperture, fs is the focal length of the camera module 40 of the paired electronic device, f1 is the focal length of the first lens group 10, f2 is the focal length of the second lens group 20, and f3 is the focal length of the third lens group 30.

[0069] When using the lens disclosed in the above embodiments of this application, and the second lens group 20 is located in the first position, the shooting angle of the camera module 40 of the electronic device is relatively large, and its defocus modulation transfer function (MTF) curve is as follows: Figure 6 As shown.

[0070] When using the lens disclosed in the above embodiments of this application, and the second lens group 20 is located in the second position, the shooting distance of the camera module 40 of the electronic device is relatively far, and its defocus modulation transfer function curve is as follows: Figure 7 As shown.

[0071] based on Figure 6 and Figure 7 It can be seen that at a spatial frequency of 70 lp / mm, the MTF value within a 0.8 field of view is greater than 0.6, indicating that the lens can still maintain high modulation transmission capability and detail contrast reproduction capability under high spatial frequency conditions. Therefore, when used with the lens structure disclosed in the above embodiments of this application, the camera module 40 of the electronic device has stable and excellent high-frequency detail resolution capability from the center to the near edge of the image, thereby effectively improving the clarity and edge detail performance of the captured video or image, and ensuring the uniformity and consistency of image quality across a large field of view.

[0072] Based on the lens disclosed in any of the above embodiments, this application also provides a shooting device, which includes an electronic device and any of the above lenses. The electronic device may include portable devices such as mobile phones or tablets, and this application does not limit this to such devices. Of course, the electronic device must have shooting capabilities. Therefore, in this application, the electronic device includes a device body and a camera module 40. The device body may specifically include a shell or other structure, and both the camera module 40 and the lens can be mounted on the shell of the device body. The camera module 40 may include corresponding lenses and a photosensitive chip. Light from outside the electronic device passes through the lens of the camera module 40 and can form a corresponding image on the photosensitive chip.

[0073] Furthermore, in this application, the camera module 40 is mounted on the device body, and the camera module 40 is typically a built-in structure of the electronic device; that is, the camera module 40 and the device body are generally not detachable. The lens, however, is an external component of the electronic device, and therefore, the two are detachable. Specifically, the lens can be detachably mounted on the device body via clips or threads. Of course, to ensure that the lens can properly provide magnification to the camera module 40, when the lens is mounted on the device body, it needs to be aligned with the camera module 40, that is, the lens should face the camera module 40, and the optical axes of both should coincide.

[0074] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A lens, characterized in that, The lens is detachably mounted on the electronic device, and the focal length of the camera module of the electronic device is fs, wherein... The lens includes a first lens group, a second lens group, a third lens group, and a lens barrel. The first lens group and the third lens group are both fixedly mounted on the lens barrel, and the second lens group is located between the first lens group and the third lens group. In the optical axis direction of the lens, the second lens group is movably mounted on the lens barrel, and the second lens group has a first position and a second position. When the second lens group is in the first position, the distance between the second lens group and the first lens group is a first distance, and the first focal length of the camera module is ft. When the second lens group is in the second position, the distance between the second lens group and the first lens group is a second distance, and the second focal length of the camera module is fw. The second distance is greater than the first distance, and ft > fw > fs.

2. The lens according to claim 1, characterized in that, 1.3≤fw / fs≤1.9, 1.5≤ft / fw≤2.

3.

3. The lens according to claim 1, characterized in that, The focal length of the first lens group is f1, the focal length of the second lens group is f2, and the focal length of the third lens group is f3. 2.5≤f1 / f2≤3, 2.3≤f1 / f3≤2.

8.

4. The lens according to claim 1, characterized in that, The first lens group is located on the side of the third lens group away from the electronic device, and the first lens group includes a plurality of lenses, at least one of the plurality of lenses having a dispersion coefficient greater than or equal to 60.

5. The lens according to claim 1, characterized in that, The second lens group includes a plurality of lenses, and at least two of the plurality of lenses are glued together.

6. The lens according to claim 1, characterized in that, The third lens group is located on the side of the first lens group closer to the electronic device, and the third lens group includes multiple lenses, at least one of which is an aspherical lens.

7. The lens according to claim 1, characterized in that, The first lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein the optical power of the first lens, the third lens, and the fifth lens is positive, and the optical power of the second lens, the fourth lens, and the sixth lens is negative.

8. The lens according to claim 7, characterized in that, The second lens group includes a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens, wherein the optical power of the seventh lens, the eighth lens, the eleventh lens, the twelfth lens, and the thirteenth lens is positive, and the optical power of the ninth lens and the tenth lens is negative.

9. The lens according to claim 8, characterized in that, The third lens group includes a fourteenth lens, a fifteenth lens, a sixteenth lens, and a seventeenth lens, wherein the optical power of the fourteenth lens, the fifteenth lens, and the seventeenth lens is positive, and the optical power of the sixteenth lens is negative.

10. A shooting device, characterized in that, The device includes an electronic device and the lens according to any one of claims 1-9. The electronic device includes a device body and a camera module, wherein the camera module is mounted on the device body, the lens is detachably mounted on the device body, and the lens is docked with the camera module.

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