Telescopic three-group continuous zoom lens and mobile phone

Abstract

The present invention discloses a telescopic three-group continuous zoom lens and a mobile phone, wherein the telescopic three-group continuous zoom lens comprises a lens body, and the direction from the object side to the image side along the optical axis of the lens body is from front to back; the lens body comprises a lens barrel, a variable magnification lens group, a compensation lens group and a driving device, the lens barrel is arranged in the front-to-back direction, and a cavity is formed in the lens barrel; the variable magnification lens group is movably arranged in the cavity in the front-to-back direction, and comprises a first lens group and a second lens group arranged at intervals from front to back; the compensation lens group is movably arranged in the cavity in the front-to-back direction, and comprises a third lens group with negative optical focal length, the third lens group is arranged at the rear side of the second lens group and is arranged at intervals from the second lens group; the driving device drives and connects the variable magnification lens group and the compensation lens group. This scheme facilitates the application of the lens body on electronic devices with imaging functions and thin thickness.

Description

Technical Field

[0001] The invention relates to the technical field of optical lenses, in particular to a telescopic three-group continuous zoom lens and a mobile phone. Background Art

[0002] In recent years, consumers have been increasingly demanding the performance and experience of mobile phone photography, and the zoom capability of mobile phone lenses has also attracted more and more attention. At present, mobile phone lenses basically use fixed-focus lenses with different focal lengths. The focal length changes between fixed-focus lenses are achieved through digital zoom. There is no real optical continuous zoom lens, and digital zoom is achieved by cropping and scaling the picture, which affects the quality of the image. The optical continuous zoom lens can achieve continuous zoom within a certain focal length range by moving certain lenses and changing the interval between the lenses. This lens has good image quality at different focal lengths. The lenses in the lens will move back and forth during the zoom process, and the photo experience is also excellent. The biggest obstacle to the application of continuous zoom lenses to mobile phones is the volume problem. Since the thickness of mobile phones generally does not exceed 10mm, the space left for the lens is very small. The length of traditional optical zoom lenses is at least tens of millimeters. Therefore, it is very difficult to apply optical zoom lenses to mobile phone cameras. Summary of the invention

[0003] The main purpose of the present invention is to provide a telescopic three-group continuous zoom lens and a mobile phone, aiming to solve the technical problem that the traditional continuous zoom lens cannot be directly applied to electronic devices with a relatively thin thickness.

[0004] To achieve the above object, the present invention provides a telescopic three-group continuous zoom lens, comprising a lens body, wherein the direction from the object side to the image side along the optical axis of the lens body is from front to back;

[0005] The lens body comprises:

[0006] A lens barrel is arranged in a front-to-back direction, and a cavity is formed in the lens barrel;

[0007] A variable-power lens group is movably disposed in the cavity along the front-back direction, and includes a first lens group and a second lens group arranged at intervals from front to back;

[0008] a compensating lens group, movably disposed in the cavity along the front-rear direction, comprising a third lens group with negative optical power, the third lens group being disposed at the rear side of the second lens group and spaced apart from the second lens group; and,

[0009] A driving device drives and connects the variable power lens group and the compensation lens group.

[0010] Optionally, the first lens group may have positive optical power;

[0011] The second lens group has positive optical power;

[0012] The focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, and the distance between the first lens group and the second lens group at the wide-angle end is d w12 The distance between the first lens group and the second lens group at the telephoto end is d t12 , the distance between the second lens group and the third lens group at the wide-angle end is d w23 , the distance between the second lens group and the third lens group at the telephoto end is d t23 , satisfying the following relationship: 15mm <f1<20mm、15mm<f2<20mm、-15mm<f3<-10mm、2mm<d w12 <2.5mm, 3.5mm <d t12 <4mm, 1mm <d w23 <1.5mm、7.5mm <d t23 <8mm.

[0013] Optionally, the first lens group includes a first lens, a second lens and a third lens arranged in sequence from front to back;

[0014] The second lens group includes a fourth lens;

[0015] The third lens group includes a fifth lens;

[0016] Among them, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all aspherical lenses.

[0017] Optionally, the first lens group may have positive optical power;

[0018] The second lens group has positive optical power;

[0019] The focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, and the distance between the first lens group and the second lens group at the wide-angle end is d w12 The distance between the first lens group and the second lens group at the telephoto end is d t12 , the distance between the second lens group and the third lens group at the wide-angle end is d w23 , the distance between the second lens group and the third lens group at the telephoto end is d t23 , satisfying the following relationship: 9mm <f1<15mm、12mm<f2<20mm、-15mm<f3<-10mm、2mm<d w12 <2.5mm, 3mm <d t12<3.5mm, 5mm <d w23 <5.5mm, 8mm <d t23 <8.5mm.

[0020] Optionally, the first lens group includes a first lens, a second lens and a third lens arranged in sequence from front to back;

[0021] The second lens group includes a fourth lens and a fifth lens arranged in sequence from front to back;

[0022] The third lens group includes a sixth lens;

[0023] Wherein, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all aspherical lenses.

[0024] Optionally, the lens body further includes an aperture, and the aperture is disposed on the first lens group and is fixed relative to the first lens group so as to be driven by the first lens group to move in the front-rear direction.

[0025] Optionally, the first lens group may have negative optical power;

[0026] The second lens group has positive optical power;

[0027] The focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, and the distance between the first lens group and the second lens group at the wide-angle end is d w12 The distance between the first lens group and the second lens group at the telephoto end is d t12 , the distance between the second lens group and the third lens group at the wide-angle end is d w23 , the distance between the second lens group and the third lens group at the telephoto end is d t23 , satisfying the following relationship: -20mm <f1<-10mm、5mm<f2<15mm、-30mm<f3<-20mm、3mm<d w12 <5mm, 0.01mm <d t12 <1mm, 5mm <d w23 <7mm, 6mm <d t23 <8mm.

[0028] Optionally, the first lens group includes a first lens, a second lens and a third lens arranged in sequence from front to back;

[0029] The second lens group includes a fourth lens, a fifth lens and a sixth lens;

[0030] The third lens group includes a seventh lens and an eighth lens;

[0031] Among them, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all aspherical lenses.

[0032] Optionally, the lens body further includes an aperture, and the aperture is disposed on the second lens group and is fixed relative to the second lens group so as to be driven by the second lens group to move in the front-rear direction.

[0033] The present invention also provides a mobile phone, the mobile phone comprises a telescopic three-group continuous zoom optical lens, the telescopic three-group continuous zoom lens comprises a lens body, and the direction from the object side to the image side along the optical axis of the lens body is from front to back;

[0034] The lens body comprises:

[0035] A lens barrel is arranged in a front-to-back direction, and a cavity is formed in the lens barrel;

[0036] A variable-power lens group is movably disposed in the cavity along the front-back direction, and includes a first lens group and a second lens group arranged at intervals from front to back;

[0037] a compensating lens group, movably disposed in the cavity along the front-rear direction, comprising a third lens group with negative optical power, the third lens group being disposed at the rear side of the second lens group and spaced apart from the second lens group; and,

[0038] A driving device drives and connects the variable power lens group and the compensation lens group.

[0039] In the technical solution of the present invention, a telescopic three-group continuous zoom optical lens comprises a lens body, and the direction from the object side to the image side along the optical axis of the lens body is from front to back; the lens body comprises a lens barrel and a variable magnification lens group and a compensation lens group arranged in the lens barrel; the variable magnification lens group comprises a first lens group and a second lens group, and the compensation lens group comprises a third lens group with negative optical focal length; the first lens group, the second lens group and the third lens group are arranged in sequence from front to back, and can be moved in the front and rear directions relative to the lens barrel respectively under the drive of the driving device. In the present scheme, the first lens group, the second lens group, and the third lens group can be respectively moved in the forward and backward directions, that is, the variable magnification lens group and the compensating lens group can move relative to each other, so that the focal length of the lens body can be adjusted, thereby facilitating the application of the lens body in more scenarios; the variable magnification lens group mainly undertakes the magnification function, and can realize the continuous zoom of the lens body from the wide-angle end to the telephoto end; the compensating lens group mainly undertakes the image plane compensation function, and can compensate the image plane during the continuous zooming of the lens body, thereby ensuring the imaging quality of the lens body during the continuous zooming. Therefore, with the cooperation of the variable magnification lens group and the compensating lens group, not only the focal length of the lens body is shortened, but also the image within the focal length range can be guaranteed to be clear. Furthermore, the size of the lens can be reduced, which facilitates the application of the telescopic three-group continuous zoom optical lens in electronic devices with imaging functions and thin thickness, such as mobile phones. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0041] Figure 1 A schematic structural diagram of a first embodiment of a lens body (first state) provided by the present invention;

[0042] Figure 2 for Figure 1 A schematic diagram of the structure of the middle lens body (second state);

[0043] Figure 3 for Figure 1 MTF curve graph at wide angle end of the medium lens body;

[0044] Figure 4 for Figure 1 Telephoto end MTF curve of the medium lens body;

[0045] Figure 5A schematic structural diagram of a second embodiment of a lens body (first state) provided by the present invention;

[0046] Figure 6 for Figure 5 A schematic diagram of the structure of the middle lens body (second state);

[0047] Figure 7 for Figure 5 MTF curve graph at wide angle end of the medium lens body;

[0048] Figure 8 for Figure 5 Telephoto end MTF curve of the medium lens body;

[0049] Fig. 9 A schematic structural diagram of a third embodiment of a lens body (first state) provided by the present invention;

[0050] Fig.10 for Fig. 9 A schematic diagram of the structure of the middle lens body (second state);

[0051] Fig.11 for Fig. 9 MTF curve graph at wide angle end of the medium lens body;

[0052] Fig.12 for Fig. 9 MTF curve of the telephoto end of the medium lens body.

[0053] Description of the accompanying drawings of the embodiments provided by the present invention:

[0054] Label name Label name 100 First lens group 300 The third lens group 200 Second lens group 400 Aperture

[0055] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0058] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0059] Traditional continuous optical zoom lens solutions cannot be directly transferred to mobile phones for application. The biggest obstacle lies in the size of the lens. Since the thickness of a mobile phone generally does not exceed 10mm, the space left for the lens is very small. The length of a traditional optical zoom lens is at least tens of millimeters. Therefore, applying optical zoom lenses to mobile phone cameras faces huge difficulties.

[0060] In view of this, the present invention proposes a telescopic three-group continuous zoom lens and a mobile phone to solve the technical problem that the traditional continuous zoom lens cannot be directly applied to electronic devices with a relatively thin thickness. Figures 1 to 4 The first embodiment of the telescopic three-group continuous zoom optical lens provided by the present invention is: Figures 5 to 8 The second embodiment of the telescopic three-group continuous zoom optical lens provided by the present invention is: Figures 9 to 12 This is the third embodiment of the telescopic three-group continuous zoom optical lens provided by the present invention. It should be noted that the first state refers to the state with the shortest focal length, and the second state refers to the state with the longest focal length.

[0061] In the present invention, the telescopic three-group continuous zoom lens includes a lens body, and the direction from the object side to the image side along the optical axis of the lens body is from front to back; the lens body includes a lens barrel (not shown in the figure), a zoom lens group, a compensation lens group and a driving device (not shown in the figure), the lens barrel is arranged in the front-to-back direction, and a cavity is formed in the lens barrel; the zoom lens group is movably arranged in the cavity in the front-to-back direction, including a first lens group 100 and a second lens group 200 arranged at intervals from front to back; the compensation lens group is movably arranged in the cavity in the front-to-back direction, including a third lens group 300 with negative optical focal length, the third lens group 300 is arranged on the rear side of the second lens group 200 and is spaced from the second lens group 200; the driving device drives and connects the zoom lens group and the compensation lens group.

[0062] In the technical solution of the present invention, a telescopic three-group continuous zoom optical lens comprises a lens body, and the direction from the object side to the image side along the optical axis of the lens body is from front to back; the lens body comprises a lens barrel and a variable power lens group and a compensation lens group arranged in the lens barrel; the variable power lens group comprises a first lens group 100 and a second lens group 200, and the compensation lens group comprises a third lens group 300 with negative optical power; the first lens group 100, the second lens group 200 and the third lens group 300 are arranged in sequence from front to back, and can be moved in the front and back directions relative to the lens barrel respectively under the drive of the driving device. In the present solution, the first lens group 100, the second lens group 200, and the third lens group 300 can be respectively moved in the forward and backward directions, that is, the variable magnification lens group and the compensating lens group can move relative to each other, so that the focal length of the lens body can be adjusted, thereby facilitating the application of the lens body in more scenarios; the variable magnification lens group mainly undertakes the variable magnification function, and can realize the continuous zooming of the lens body from the wide-angle end to the telephoto end; the compensating lens group mainly undertakes the image plane compensation function, and can compensate the image plane during the continuous zooming of the lens body, thereby ensuring the imaging quality of the lens body during the continuous zooming. Therefore, under the cooperation of the variable magnification lens group and the compensating lens group, not only the focal length of the lens body is shortened, but also the image within the focal length range can be guaranteed to be clear. Furthermore, the size of the lens can be reduced, which is convenient for the application of the telescopic three-group continuous zoom optical lens on electronic devices with imaging functions and thin thickness.

[0063] See also Figure 1 to Figure 2 In the first embodiment, the first lens group 100 has positive power; the second lens group 200 has positive power; the focal length of the first lens group 100 is f1, the focal length of the second lens group 200 is f2, the focal length of the third lens group 300 is f3, and the distance between the first lens group 100 and the second lens group 200 at the wide angle end is d w12 The distance between the first lens group 100 and the second lens group 200 at the telephoto end is d t12 , the distance between the second lens group 200 and the third lens group 300 at the wide angle end is d w23 , the distance between the second lens group 200 and the third lens group 300 at the telephoto end is d t23 , satisfying the following relationship: 15mm <f1<20mm、15mm<f2<20mm、-15mm<f3<-10mm、2mm<d w12 <2.5mm, 3.5mm <d t12 <4mm, 1mm <d w23 <1.5mm、7.5mm <d t23<8mm.

[0064] Based on the above parameters, when each lens group in the first lens group 100, the second lens group 200 and the third lens group 300 moves forward and backward, there is an active stroke between the adjacent lens groups to approach and move away from each other. By adjusting the relative position between the first lens group 100 and the second lens group 200 in the variable magnification lens group, the focal length of the lens body can be changed accordingly, and the lens body can be adjusted to a desired magnification; by adjusting the relative position of the third lens group 300 in the lens barrel, the imaging picture of the lens body can be adjusted to a desired imaging quality. In this embodiment, the relative movement between the variable magnification lens group and the compensation lens group allows the focal length of the lens body to be adjusted between 10mm and 15.5mm, and ensures that the image within the focal length range is clear. Therefore, the size of the lens can be reduced, which is convenient for the application of the telescopic three-group continuous zoom optical lens in electronic devices with imaging functions and thin thickness.

[0065] Figure 3 is a wide-angle end MTF curve diagram of the lens body described in this embodiment; Figure 4 : is the MTF curve diagram of the telephoto end of the lens body described in this embodiment.

[0066] In this embodiment, when the first lens group 100, the second lens group 200 and the third lens group 300 move away from each other in the front-to-back direction, the length of the lens body is 13.40-17.20 mm. It can be understood that the lens barrel is configured as a telescopic structure, which can be driven to perform telescopic deformation when the first lens group 100, the second lens group 200 and the third lens group 300 move in the front-to-back direction; or, the lens barrel can move in the front-to-back direction relative to the device body, so that when the first lens group 100, the second lens group 200 and the third lens group 300 move in the front-to-back direction, the lens barrel can also move in the front-to-back direction, and at least partially be accommodated in the device body or at least partially protrude from the outer wall of the device body. In this way, when the first lens group 100, the second lens group 200 and the third lens group 300 are away from each other, the length of the lens body can be set to 13.40-17.20 mm. When the length of the lens body is within the above range, interference between the protruding lens and the user's related operations when the user is using the mobile phone is avoided; and when the first lens group 100, the second lens group 200 and the third lens group 300 move closer to each other in the front-to-back direction, the optical length of the lens body can be set to 5.0 mm-5.9 mm. Specifically, the optical length of the lens body can be selected to be 5.9 mm, and the mechanical length of the lens body can be less than 7 mm. In this way, the requirements of thinner electronic devices for lens length are met, and when not in use, the lens body can be stored as much as possible.

[0067] In order to improve the clarity of the image, in this embodiment, the lens body further includes an aperture 400, which is disposed on the first lens group 100 and fixed relative to the first lens group 100 so as to be driven by the first lens group 100 to move in the front-to-back direction. The aperture 400 is an aperture aperture, which can limit the imaging light beam to the greatest extent; the position of the aperture 400 and the size of its light hole are directly related to the brightness, clarity, and partial aberration of the image formed by the lens body. The aperture 400 is disposed on the rear side of the first lens group 100 and moves synchronously with the first lens group 100 in the front-to-back direction, so that the image has appropriate brightness and clarity during the zooming process of the lens body.

[0068] It should be noted that the smaller the aperture of the diaphragm, the smaller the spherical aberration, the clearer the image, the greater the depth of field, but the weaker the brightness of the image; conversely, the larger the aperture of the diaphragm, the brighter the image, the greater the Rice spherical aberration, the worse the relative clarity, and the smaller the depth of field. Therefore, in this embodiment, the aperture of the diaphragm 400 can be set to a fixed size or can be set to be adjustable within a certain size range.

[0069] In this embodiment, the first lens group 100 includes a first lens, a second lens and a third lens arranged in sequence from front to back; the second lens group 200 includes a fourth lens; the third lens group 300 includes a fifth lens; wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all configured as aspherical lenses.

[0070] Specifically, please refer to Tables 1 to 4 below. Tables 1 to 4 provide specific data for implementing the telescopic three-group continuous zoom optical lens described in the first embodiment.

[0071] Among them, S1 to S10 in Table 1 represent the surface numbers of each optical element, R represents the radius of curvature of the optical element, D represents the thickness or air gap of the optical element, and N d Represents the refractive index of the optical material used, V d represents the d-light Abbe number of the optical material used; f′ in Table 2 represents the focal length of the system, F-number is the system F number, and ω is the semi-field angle of the system; D1 in Table 3 represents the variable distance between the first lens group 100 and the second lens group 200, D2 represents the variable distance between the second lens group 200 and the third lens group 300, and D3 represents the variable distance between the third lens group 300 and the image plane; the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all aspherical lenses; Table 4 gives the aspherical coefficients of all surfaces of the aspherical lenses, wherein K is the quadratic surface coefficient of the aspherical surface, and A4 to A16 are even-order aspherical coefficients.

[0072] Table 1

[0073] Surface number Curvature radius R(mm) Distance D(mm) <![CDATA[Refractive index N d > <![CDATA[Abbe number V d > S1 -10～-9.5 1 1.5～1.6 65～70 S2 -4～-3.5 0.1 S3 110～120 1 1.7～1.8 40～45 S4 -35～-30 0.1 S5 3.5～4 0.5 1.8～1.9 15～20 STOP 2.5～3 D1 S7 -8～-7.5 1 1.6～1.7 50～55 S8 -5～-4 D2 S9 15～20 0.5 1.5～1.6 80～85 S10 4.5～5 D3 IMAGE INF

[0074] Table 2

[0075] System focal length f′ F-numberF-number Half field of view ω Wide angle 10.0 1.90 21.2 Telephoto 15.5 3.00 13.9

[0076] Table 3

[0077]

[0078]

[0079] Table 4

[0080] K A4 A6 A8 A10 A12 A14 A16 S1 5.19E+00 -1.12E-02 2.03E-03 2.10E-04 -8.15E-05 9.38E-06 -4.84E-07 9.07E-09 S2 -3.34E+00 -7.54E-04 7.13E-04 1.49E-04 -2.25E-05 -1.47E-06 4.57E-07 -2.27E-08 S3 9.90E+01 2.23E-02 -5.10E-03 1.18E-03 -1.80E-04 1.66E-05 -8.13E-07 1.37E-08 S4 -9.90E+01 2.61E-02 -1.82E-02 6.38E-03 -1.26E-03 1.41E-04 -8.44E-06 2.11E-07 S5 -2.02E+01 1.21E-02 -2.26E-02 9.67E-03 -2.17E-03 2.76E-04 -1.88E-05 5.37E-07 S6 -9.15E+00 -6.33E-03 -6.44E-03 3.72E-03 -9.44E-04 1.34E-04 -1.00E-05 3.15E-07 S7 -7.48E+00 -8.71E-03 3.47E-04 -3.54E-04 1.54E-04 -3.33E-05 3.71E-06 -1.65E-07 S8 -2.62E+00 -5.72E-03 2.03E-04 -1.48E-04 5.52E-05 -1.03E-05 9.80E-07 -3.72E-08 S9 -9.90E+01 -2.30E-02 4.14E-03 -8.74E-04 1.45E-04 -1.57E-05 9.26E-07 -2.29E-08 S10 -1.35E+01 -1.27E-02 1.84E-03 -3.08E-04 4.48E-05 -4.19E-06 2.07E-07 -4.11E-09

[0081] See also Figure 5 to Figure 6In the second embodiment, the first lens group 100 has positive power; the second lens group 200 has positive power; the focal length of the first lens group 100 is f1, the focal length of the second lens group 200 is f2, the focal length of the third lens group 300 is f3, and the distance between the first lens group 100 and the second lens group 200 at the wide angle end is d w12 The distance between the first lens group 100 and the second lens group 200 at the telephoto end is d t12 , the distance between the second lens group 200 and the third lens group 300 at the wide angle end is d w23 , the distance between the second lens group 200 and the third lens group 300 at the telephoto end is d t23 , satisfying the following relationship: 9mm <f1<15mm、12mm<f2<20mm、-15mm<f3<-10mm、2mm<d w12 <2.5mm, 3mm <d t12 <3.5mm, 5mm <d w23 <5.5mm, 8mm <d t23 <8.5mm.

[0082] Based on the above parameters, when each lens group in the first lens group 100, the second lens group 200 and the third lens group 300 moves forward and backward, there is an active stroke between the adjacent lens groups to approach and move away from each other. By adjusting the relative position between the first lens group 100 and the second lens group 200 in the variable magnification lens group, the focal length of the lens body can be changed accordingly, so that the lens body can be adjusted to a desired magnification; by adjusting the relative position of the third lens group 300 in the lens barrel, the imaging picture of the lens body can be adjusted to a desired imaging quality. In this embodiment, the relative movement between the variable magnification lens group and the compensation lens group allows the focal length of the lens body to be adjusted between 9.8 mm and 16 mm, and ensures that the image within the focal length range is clear. Therefore, the size of the lens can be reduced, which is convenient for the application of the telescopic three-group continuous zoom optical lens in electronic devices with imaging functions and thin thickness.

[0083] Figure 7 is a wide-angle end MTF curve diagram of the lens body described in this embodiment; Figure 8 : is the MTF curve diagram of the telephoto end of the lens body described in this embodiment.

[0084] In this embodiment, when the first lens group 100, the second lens group 200 and the third lens group 300 move away from each other in the front-to-back direction, the length of the lens body is 13.43-17.32 mm. It can be understood that the lens barrel is configured as a telescopic structure, which can be driven to perform telescopic deformation when the first lens group 100, the second lens group 200 and the third lens group 300 move in the front-to-back direction; or, the lens barrel can move in the front-to-back direction relative to the device body, so that when the first lens group 100, the second lens group 200 and the third lens group 300 move in the front-to-back direction, the lens barrel can also move in the front-to-back direction, and at least partially be accommodated in the device body or at least partially protrude from the outer wall of the device body. In this way, when the first lens group 100, the second lens group 200 and the third lens group 300 are away from each other, the length of the lens body can be set to 13.43-17.32 mm. When the length of the lens body is within the above range, interference between the protruding lens and the user's related operations when the user is using the mobile phone is avoided; and when the first lens group 100, the second lens group 200 and the third lens group 300 move toward each other in the front-to-back direction, the optical length of the lens body can be set to 6.0 mm-6.9 mm. Specifically, the optical length of the lens body can be selected to be 6.6 mm, and the mechanical length of the lens body can be less than 7.6 mm. In this way, the requirements of thinner electronic devices for lens length are met, and when not in use, the lens body can be stored as much as possible.

[0085] It should be noted that, in this embodiment, the lens body is also provided with an aperture 400, which is provided on the first lens group 100 and fixed relative to the first lens group 100 so as to be driven by the first lens group 100 to move in the front-rear direction. The aperture 400 is an aperture aperture, which can limit the imaging light beam to the greatest extent; the position of the aperture 400 and the size of the light hole have a direct relationship with the brightness, clarity, and size of partial aberrations of the image formed by the lens body. The aperture 400 is provided on the rear side of the first lens group 100 and moves synchronously with the first lens group 100 in the front-rear direction, so that the image has appropriate brightness and clarity during the zooming process of the lens body.

[0086] In this embodiment, the first lens group 100 includes a first lens, a second lens, and a third lens arranged in sequence from front to back; the second lens group 200 includes a fourth lens and a fifth lens arranged in sequence from front to back; the third lens group 300 includes a sixth lens; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all configured as aspherical lenses.

[0087] Specifically, please refer to Tables 5 to 8 below. Tables 5 to 8 provide specific data for implementing the telescopic three-group continuous zoom optical lens described in the second embodiment.

[0088] Among them, S1 to S12 in Table 5 represent the surface numbers of each optical element, R represents the radius of curvature of the optical element, D represents the thickness or air gap of the optical element, and N d Represents the refractive index of the optical material used, V d represents the d-light Abbe number of the optical material used; f′ in Table 6 represents the focal length of the system, F-number is the system F number, and ω is the semi-field angle of the system; D1 in Table 7 represents the variable distance between the first lens group 100 and the second lens group 200, D2 represents the variable distance between the second lens group 200 and the third lens group 300, and D3 represents the variable distance between the third lens group 300 and the image plane; the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all aspherical lenses, and Table 8 gives the aspherical coefficients of all surfaces of the aspherical lenses, wherein K is the quadratic surface coefficient of the aspherical surface, and A4~A16 are even-order aspherical coefficients.

[0089] Table 5

[0090]

[0091]

[0092] Table 6

[0093] System focal length f' F-numberF-number Half field of view ω Wide-angle end 9.8 1.89 25.2 Telephoto 16.0 2.98 16.5

[0094] Table 7

[0095] D1 D2 D3 Wide-angle end 2.3 5.1 1.5 Telephoto 3.1 0.8 9.1

[0096] Table 8

[0097] K A4 A6 A8 A10 A12 A14 A16 S1 -3.90E+00 -3.30E-03 1.69E-03 -8.46E-05 -6.26E-06 6.61E-07 1.47E-08 -1.91E-09 S2 -4.52E+00 -3.19E-03 1.75E-03 -1.10E-04 1.52E-06 1.36E-07 -9.12E-09 2.10E-09 S3 3.53E+00 -1.51E-03 9.87E-04 -4.46E-05 -2.09E-06 3.08E-09 1.00E-08 -5.72E-09 S4 -1.15E+01 7.76E-03 4.94E-04 -1.28E-05 2.67E-07 -5.24E-07 -9.29E-08 7.22E-09 S5 -8.59E+01 1.58E-03 1.72E-04 3.26E-06 -8.88E-06 -6.41E-08 1.29E-07 -4.90E-09 S6 -3.93E+01 -1.21E-02 1.21E-03 -1.36E-04 4.85E-06 7.62E-07 -1.07E-07 5.71E-09 S7 4.19E+00 -8.22E-03 1.59E-03 -1.17E-04 1.15E-05 -2.25E-06 2.86E-07 -1.38E-08 S8 -9.62E+01 -5.04E-03 8.45E-04 -5.51E-05 -5.01E-06 -8.86E-08 2.38E-07 -1.72E-08 S9 -9.29E+01 1.15E-03 -9.84E-05 1.15E-05 -5.48E-06 -8.13E-08 1.65E-07 -1.13E-08 S10 1.98E+00 1.82E-03 3.32E-04 -1.88E-05 6.54E-07 -4.12E-07 7.19E-08 -3.41E-09 S11 6.18E+01 -2.32E-02 4.39E-03 -6.57E-04 6.43E-05 -3.21E-06 1.08E-08 4.27E-09 S12 -3.52E+01 -1.60E-02 3.24E-03 -5.11E-04 5.88E-05 -4.50E-06 2.02E-07 -3.96E-09

[0098] See also Figures 9 and 10 In the third embodiment, the first lens group 100 has negative power; the second lens group 200 has positive power; the focal length of the first lens group 100 is f1, the focal length of the second lens group 200 is f2, the focal length of the third lens group 300 is f3, and the distance between the first lens group 100 and the second lens group 200 at the wide angle end is d w12 The distance between the first lens group 100 and the second lens group 200 at the telephoto end is d t12 , the distance between the second lens group 200 and the third lens group 300 at the wide angle end is dw23 , the distance between the second lens group 200 and the third lens group 300 at the telephoto end is d t23 , satisfying the following relationship: -20mm <f1<-10mm、5mm<f2<15mm、-30mm<f3<-20mm、3mm<d w12 <5mm, 0.01mm <d t12 <1mm, 5mm <d w23 <7mm, 6mm <d t23 <8mm.

[0099] Based on the above parameters, when each lens group in the first lens group 100, the second lens group 200 and the third lens group 300 moves forward and backward, there is an active stroke between the adjacent lens groups to approach and move away from each other. By adjusting the relative position between the first lens group 100 and the second lens group 200 in the variable magnification lens group, the focal length of the lens body can be changed accordingly, and the lens body can be adjusted to a desired magnification; by adjusting the relative position of the third lens group 300 in the lens barrel, the imaging picture of the lens body can be adjusted to a desired imaging quality. In this embodiment, the relative movement between the variable magnification lens group and the compensation lens group allows the focal length of the lens body to be adjusted between 9.5 mm and 18 mm, and ensures that the image within the focal length range is clear. Furthermore, the size of the lens can be reduced, which facilitates the application of the telescopic three-group continuous zoom optical lens in electronic devices with imaging functions and thin thickness.

[0100] Fig.11 is a wide-angle end MTF curve diagram of the lens body described in this embodiment; Fig.12 : is the MTF curve diagram of the telephoto end of the lens body described in this embodiment.

[0101] In this embodiment, when the first lens group 100, the second lens group 200 and the third lens group 300 move away from each other in the front-to-back direction, the length of the lens body is 18.00-19.00 mm. It can be understood that the lens barrel is configured as a telescopic structure, which can be driven to perform telescopic deformation when the first lens group 100, the second lens group 200 and the third lens group 300 move in the front-to-back direction; or, the lens barrel can move in the front-to-back direction relative to the device body, so that when the first lens group 100, the second lens group 200 and the third lens group 300 move in the front-to-back direction, the lens barrel can also move in the front-to-back direction, and at least partially be accommodated in the device body or at least partially protrude from the outer wall of the device body. By such arrangement, when the first lens group 100, the second lens group 200 and the third lens group 300 are away from each other, the length of the lens body can be set to 18.00-19.00 mm. When the length of the lens body is within the above range, interference between the protruding lens and the user's related operations when the user is using the mobile phone is avoided; and when the first lens group 100, the second lens group 200 and the third lens group 300 move toward each other in the front-to-back direction, the optical length of the lens body is 8.0 mm-8.9 mm. Specifically, the optical length of the lens body can be selected to be 8.6 mm, and the mechanical length of the lens body can be less than 9.1 mm. In this way, the requirements of thinner electronic devices for lens length are met, and when not in use, the lens body can be stored as much as possible.

[0102] It should be noted that, in this embodiment, the lens body is also provided with an aperture 400, which is provided in the second lens group 200 and fixed relative to the second lens group 200 so as to be driven by the second lens group 200 to move in the front-rear direction. The aperture 400 is an aperture aperture, which can limit the imaging light beam to the greatest extent; the position of the aperture 400 and the size of the light hole have a direct relationship with the brightness, clarity, and partial aberration of the image formed by the lens body. The aperture 400 is provided in the middle of the second lens group 200 and moves synchronously with the second lens group 200 in the front-rear direction, so that the image has a suitable brightness and clarity during the zooming process of the lens body.

[0103] Similarly, the smaller the aperture of the diaphragm, the smaller the spherical aberration, the clearer the image, the greater the depth of field, but the weaker the brightness of the image; conversely, the larger the aperture of the diaphragm, the brighter the image, the greater the Rice spherical aberration, the worse the relative clarity, and the smaller the depth of field. Therefore, in this embodiment, the aperture of the diaphragm 400 can be set to a fixed size or can be set to be adjustable within a certain size range.

[0104] In this embodiment, the first lens group 100 includes a first lens, a second lens, and a third lens arranged in sequence from front to back; the second lens group 200 includes a fourth lens, a fifth lens, and a sixth lens; the third lens group 300 includes a seventh lens and an eighth lens; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are all aspherical lenses.

[0105] Specifically, please refer to Tables 9 to 12 below. Tables 9 to 12 provide specific data for implementing the telescopic three-group continuous zoom optical lens described in the third embodiment.

[0106] Among them, S1 to S17 in Table 9 represent the surface numbers of each optical element, R represents the radius of curvature of the optical element, D represents the thickness or air gap of the optical element, and N d Represents the refractive index of the optical material used, V d represents the d-light Abbe number of the optical material used; f′ in Table 10 represents the focal length of the system, F-number is the system F number, and ω is the semi-field angle of the system; D1 in Table 11 represents the variable distance between the first lens group 100 and the second lens group 200, D2 represents the variable distance between the second lens group 200 and the third lens group 300, and D3 represents the variable distance between the third lens group 300 and the image plane; Table 12 gives the aspheric coefficients of all surfaces of the aspheric lens, wherein K is the quadratic surface coefficient of the aspheric surface, and A4~A10 are even-order aspheric coefficients.

[0107] Table 9

[0108] Surface number Curvature radius R(mm) Distance D(mm) Refractive index Nd Abbe number Vd S1 10～20 1 1.9～2.0 20～30 S2 -20～-10 0.1 S3 -20～-10 0.5 1.9～2.0 15～25 S4 -40～-30 0.1 S5 -20～-10 0.5 1.8～1.9 25～35 S6 5～15 D1 S7 5～15 1.3 1.6～1.7 45～55 S8 -40～-30 0.6 Stop INF -0.5 S10 1～10 1.3 1.5～1.6 80～90 S11 40～50 0.1 S12 5～15 0.5 1.9～2.0 15～25 S13 1～10 D2 S14 15～25 1.3 1.9～2.0 15～25 S15 -10～-1 0.1 S16 -10～-1 0.5 1.8～1.9 30～40 S17 15～25 D3 IMAGE INF

[0109] Table 10

[0110] System focal length f' F-numberF-number Half field of view ω Wide angle 9.5 1.95 24.3 Telephoto 18.0 2.87 12.9

[0111] Table 11

[0112]

[0113]

[0114] Table 12

[0115] K A4 A6 A8 A10 S1 6.93E-01 -6.97E-04 -1.01E-05 3.38E-07 5.52E-09 S2 -3.73E-01 4.68E-05 -2.42E-06 -6.00E-07 3.60E-08 S3 -6.61E-01 -3.28E-04 -1.40E-05 7.05E-07 1.53E-08 S4 1.16E+01 -1.25E-03 -8.98E-06 -8.14E-07 1.37E-07 S5 2.42E+00 9.36E-05 -1.72E-05 -3.18E-06 2.07E-07 S6 3.80E-01 -5.70E-04 -1.90E-05 -4.84E-07 3.28E-08 S7 -5.14E-02 -1.16E-03 2.06E-06 -4.85E-07 9.75E-08 S8 2.27E+01 3.55E-04 4.40E-05 -3.91E-06 1.85E-07 STOP / / / / / S10 1.93E-01 8.29E-04 -9.26E-06 1.50E-05 -1.34E-06 S11 9.84E+01 -2.38E-03 4.87E-04 -5.09E-05 1.80E-06 S12 5.50E-01 3.68E-04 2.58E-04 -4.58E-05 2.70E-06 S13 1.29E-01 3.10E-03 1.68E-04 -2.24E-05 6.70E-06 S14 -6.30E+00 -1.45E-03 -6.84E-05 -2.69E-06 -2.17E-06 S15 3.97E+00 1.31E-03 -2.82E-04 1.90E-05 -1.18E-06 S16 -7.14E-02 1.88E-03 -5.85E-05 2.31E-05 -9.48E-07 S17 7.97E+00 -2.65E-03 2.77E-04 -1.27E-05 6.08E-08

[0116] In addition, the present invention further provides a mobile phone, the mobile phone includes the telescopic three-group continuous zoom optical lens described in the above technical solution. It should be noted that the detailed structure of the continuous zoom optical lens in the mobile phone can refer to the embodiment of the telescopic three-group continuous zoom optical lens, which will not be repeated here; since the telescopic three-group continuous zoom optical lens is used in the mobile phone of the present invention, the embodiment of the mobile phone of the present invention includes all technical solutions of all embodiments of the telescopic three-group continuous zoom optical lens, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0117] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A telescopic three-group continuous zoom optical lens, characterized in that: It includes a lens body, and the direction from the object side to the image side along the optical axis of the lens body is from front to back; The lens body comprises: A lens barrel is arranged in a front-to-back direction, and a cavity is formed in the lens barrel; A variable-power lens group is movably disposed in the cavity along the front-back direction, and includes a first lens group and a second lens group arranged at intervals from front to back; a compensating lens group, movably disposed in the cavity along the front-rear direction, comprising a third lens group with negative optical power, the third lens group being disposed at the rear side of the second lens group and spaced apart from the second lens group; and, A driving device, driving and connecting the variable magnification lens group and the compensation lens group; The first lens group may have positive optical power; The second lens group has positive optical power; The focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, and the distance between the first lens group and the second lens group at the wide-angle end is d w12 The distance between the first lens group and the second lens group at the telephoto end is d t12 , the distance between the second lens group and the third lens group at the wide-angle end is d w23 , the distance between the second lens group and the third lens group at the telephoto end is d t23 , satisfying the following relationship: 15mm <f1<20mm、15mm<f2<20mm、-15mm<f3<-10mm、2mm<d w12 <2.5mm, 3.5mm <d t12 <4mm, 1mm <d w23 <1.5mm、7.5mm <d t23 <8mm; The first lens group includes a first lens, a second lens and a third lens arranged in sequence from front to back; The second lens group includes a fourth lens; The third lens group includes a fifth lens; Among them, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all aspherical lenses.

2. A telescopic three-group continuous zoom optical lens, characterized in that: It includes a lens body, and the direction from the object side to the image side along the optical axis of the lens body is from front to back; The lens body comprises: A lens barrel is arranged in a front-to-back direction, and a cavity is formed in the lens barrel; A variable-power lens group is movably disposed in the cavity along the front-back direction, and includes a first lens group and a second lens group arranged at intervals from front to back; a compensating lens group, movably disposed in the cavity along the front-rear direction, comprising a third lens group with negative optical power, the third lens group being disposed at the rear side of the second lens group and spaced apart from the second lens group; and, A driving device, driving and connecting the variable magnification lens group and the compensation lens group; The first lens group may have positive optical power; The second lens group has positive optical power; The focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, and the distance between the first lens group and the second lens group at the wide-angle end is d w12 The distance between the first lens group and the second lens group at the telephoto end is d t12 , the distance between the second lens group and the third lens group at the wide-angle end is d w23 , the distance between the second lens group and the third lens group at the telephoto end is d t23 , satisfying the following relationship: 9mm <f1<15mm、12mm<f2<20mm、-15mm<f3<-10mm、2mm<d w12 <2.5mm, 3mm <d t12 <3.5mm, 5mm <d w23 <5.5mm, 8mm <d t23 <8.5mm; The first lens group includes a first lens, a second lens and a third lens arranged in sequence from front to back; The second lens group includes a fourth lens and a fifth lens arranged in sequence from front to back; The third lens group includes a sixth lens; Wherein, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all aspherical lenses.

3. The telescopic three-group continuous zoom optical lens according to claim 1 or 2, characterized in that: The lens body further includes an aperture, which is disposed on the first lens group and fixed relative to the first lens group so as to be driven by the first lens group to move in the front-rear direction.

4. A telescopic three-group continuous zoom optical lens, characterized in that: It includes a lens body, and the direction from the object side to the image side along the optical axis of the lens body is from front to back; The lens body comprises: A lens barrel is arranged in a front-to-back direction, and a cavity is formed in the lens barrel; A variable-power lens group is movably disposed in the cavity along the front-back direction, and includes a first lens group and a second lens group arranged at intervals from front to back; a compensating lens group, movably disposed in the cavity along the front-rear direction, comprising a third lens group with negative optical power, the third lens group being disposed at the rear side of the second lens group and spaced apart from the second lens group; and, A driving device, driving and connecting the variable magnification lens group and the compensation lens group; The first lens group may have negative optical power; The second lens group has positive optical power; The focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, and the distance between the first lens group and the second lens group at the wide-angle end is d w12 The distance between the first lens group and the second lens group at the telephoto end is d t12 , the distance between the second lens group and the third lens group at the wide-angle end is d w23 , the distance between the second lens group and the third lens group at the telephoto end is d t23 , satisfying the following relationship: -20mm <f1<-10mm、5mm<f2<15mm、-30mm<f3<-20mm、3mm<d w12 <5mm, 0.01mm <d t12 <1mm, 5mm <d w23 <7mm, 6mm <d t23 <8mm; The first lens group includes a first lens, a second lens and a third lens arranged in sequence from front to back; The second lens group includes a fourth lens, a fifth lens and a sixth lens; The third lens group includes a seventh lens and an eighth lens; Among them, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all aspherical lenses.

5. The telescopic three-group continuous zoom optical lens according to claim 4, characterized in that: The lens body also includes an aperture, which is arranged on the second lens group and fixed relative to the second lens group so as to be driven by the second lens group to move in the front-rear direction.

6. A mobile phone, characterized in that: It comprises the telescopic three-group continuous zoom optical lens as described in any one of claims 1 to 5.

Images