Optical zoom lens, image capturing device and electronic device

Abstract

The utility model provides an optical zoom lens, an image capturing device and electronic equipment, and the optical zoom lens sequentially comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power and a fourth lens group with positive focal power from an object side to an image side along an optical axis. The technical effect of large-range high-definition imaging on targets with far and near distances, high-speed movement and the like is achieved, the center resolution of the zoom optical system is higher than 300 lp / mm (line pair / mm), and compared with existing lenses with the resolution of 720 P and 1080 P, the resolution is obviously improved; the optical lenses in the four lens groups are reasonably configured, and the four lens groups sequentially adopt the focal power configuration of +,-, + and +, so that the imaging effect with large zoom times and higher quality is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging technology, in particular to an optical zoom lens, an image capturing device and an electronic device. BACKGROUND

[0002] In the prior art, a zoom lens is usually arranged in a camera device of a telephone device such as a smart phone or other electronic device. In the zoom lens, a plurality of lens groups with positive refractive power or negative refractive power such as convex lenses or concave lenses are arranged and combined between an object and an imaging chip to achieve zooming.

[0003] However, the existing zoom optical system has a large volume, a long group movement distance, and a limited application range, and cannot meet the requirements of a wide shooting range and a long distance. The resolution of the captured image is low, and the imaging effect is not ideal. How to design a small-volume high-resolution zoom lens has become a technical problem to be solved. SUMMARY

[0004] In order to at least overcome the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide an optical zoom lens, an image capturing device and an electronic device.

[0005] In a first aspect, the present application provides an optical zoom lens, which comprises, in order from an object side to an image side along an optical axis,

[0006] a first lens group, which is a front fixed lens group and has positive refractive power;

[0007] a second lens group, which is relatively movable along the optical axis and is a variable magnification lens group and has negative refractive power;

[0008] a third lens group, which is a rear fixed lens group and has positive refractive power;

[0009] a fourth lens group, which is relatively movable along the optical axis and is a compensation lens group and has positive refractive power.

[0010] In a possible implementation manner, focal lengths f1, f2, f3 and f4 of the first lens group, the second lens group, the third lens group and the fourth lens group satisfy the following conditions: 60 < f1 < 70; -15 < f2 < -10; 40 < f3 < 50; and 15 < f4 < 20.

[0011] In a possible implementation manner, the optical zoom lens satisfies the following conditions: a focal length f W of the optical zoom lens at a short-focus end and an optical total length TTL of the optical zoom lens satisfy: 12 < TTL / f W < 16.

[0012] In a possible implementation, the optical zoom lens satisfies the following condition: when the optical zoom lens zooms from a short focal length end to a long focal length end, the moving distance m2 of the second lens group and the moving distance m4 of the fourth lens group satisfy the following condition: 2.6<|m2 / f2|<3.0; 0.3<|m4 / f4|<0.5, where f2 and f4 are focal lengths of the second lens group and the fourth lens group.

[0013] Preferably, the moving distance m2 of the second lens group is less than or equal to 33.5 mm.

[0014] Preferably, the moving distance m4 of the fourth lens group is less than or equal to 6.8 mm.

[0015] In a possible implementation, the first lens group comprises, in order from the object side to the image side along the optical axis, a first lens, a second lens, and a third lens,

[0016] The first lens is a spherical lens with negative optical power and a concave surface facing the image side;

[0017] The second lens is a spherical lens with positive optical power and a concave surface facing the image side;

[0018] The third lens is a spherical lens with positive optical power and a concave surface facing the image side;

[0019] The concave surface of the first lens and the convex surface of the second lens are cemented together;

[0020] The second lens group comprises, in order from the object side to the image side along the optical axis, a fourth lens, a fifth lens, and a sixth lens,

[0021] The fourth lens is a spherical lens with negative optical power and a concave surface facing the image side;

[0022] The fifth lens is a double-concave spherical lens;

[0023] The sixth lens is a spherical lens with positive optical power and a concave surface facing the image side;

[0024] The concave surface of the fifth lens and the convex surface of the sixth lens are cemented together;

[0025] The third lens group comprises, in order from the object side to the image side along the optical axis, a seventh lens and an eighth lens,

[0026] The seventh lens is a double-convex spherical lens;

[0027] The eighth lens is a spherical lens with negative optical power and a convex surface facing the image side;

[0028] The convex surface of the seventh lens and the concave surface of the eighth lens are cemented together;

[0029] The fourth lens group comprises, sequentially arranged from the object side to the image side along the optical axis, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens and a thirteenth lens;

[0030] The ninth lens is a double-convex spherical lens;

[0031] The tenth lens is a double-convex spherical lens;

[0032] The eleventh lens is a double-concave spherical lens;

[0033] The twelfth lens is a double-convex spherical lens;

[0034] The thirteenth lens is a spherical lens with negative power and convex surface facing the image side;

[0035] The convex surface of the tenth lens and the concave surface of the eleventh lens are cemented, and the convex surface of the twelfth lens and the concave surface of the thirteenth lens are cemented.

[0036] In a possible implementation manner, the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens and the thirteenth lens are respectively f Lens1 = -79.1 mm, f Lens2 = 57 mm, f Lens3 = 92.5 mm, f Lens4 = -14.3 mm, f Lens5 = -14.1 mm, f Lens6 = 16.2 mm, f Lens7 = 11.9 mm, f Lens8 = -15.4 mm, f Lens9 = 22.1 mm, f Lens10 = 14.2 mm, f Lens11 = -7 mm, f Lens12 = 6.5 mm, f Lens13 = -7.2 mm.

[0037] In a possible implementation manner, the thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens and the thirteenth lens are respectively T Lens1 = 2 mm, T Lens2 = 6.5 mm, T Lens3 = 3.5 mm, T Lens4 = 1 mm, T Lens5 = 0.8 mm, T Lens6= 2.8mm, T Lens7 = 2.08mm, T Lens8 = 0.8mm, T Lens9 = 1.8mm, T Lens10 = 3.88mm, T Lens11 = 4mm, T Lens12 = 2.78mm, T Lens13 = 1mm.

[0038] In a possible implementation, the optical zoom lens further comprises a diaphragm, which is located between the second lens group and the third lens group.

[0039] In a possible implementation, the optical zoom lens further comprises a filter, which is located on the image side of the fourth lens group.

[0040] In a possible implementation, the air intervals of the air interval between the second lens and the third lens, the air interval between the third lens and the fourth lens, the air interval between the fourth lens and the fifth lens, the air interval between the sixth lens and the diaphragm, the air interval between the diaphragm and the seventh lens, the air interval between the eighth lens and the ninth lens, the air interval between the ninth lens and the tenth lens, the air interval between the eleventh lens and the twelfth lens, and the air interval between the thirteenth lens and the filter are d1=0.1mm, d2=1.5mm-35mm, d3=4.4mm, d4=1.5mm-35mm, d5=0.1mm, d6=1.5-8.28mm, d7=0.1mm, d8=0.37mm, d9=4.05-10.83mm, respectively.

[0041] In a second aspect, the embodiments of the present application provide an image taking device, which comprises the optical zoom lens and a photosensitive element.

[0042] In a possible implementation, the size of the photosensitive element is 1 / 2.7 inch.

[0043] In a third aspect, the embodiments of the present application provide an electronic device, which comprises a shell and the image taking device.

[0044] Compared with the prior art, the present application has the following beneficial effects:

[0045] 1. The present application has reasonable design, low processing difficulty and low material cost, and realizes high resolution performance at low cost.

[0046] 2. This invention can achieve large-scale high-definition imaging of targets at both long and short distances and at high speeds. The center resolution of the zoom optical system exceeds 300 lp / mm (line pairs / mm), which is a significant improvement over existing lenses with resolutions of 720P and 1080P.

[0047] 3. The present invention adopts a structure in which only two fixed lens groups, a variable magnification lens group and a compensating lens group cooperate with each other. The focal length of the optical system can change with the change of the position of the variable magnification lens group, thereby reducing the length of the optical system from the short focal end to the long focal end. The aperture is set and fixed between the second lens group and the third lens group, which reduces the volume of the optical system and realizes a small-volume, high-resolution optical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0049] Figure 1 A schematic structural diagram of an optical zoom lens provided in an embodiment of the present application;

[0050] Figure 2 A schematic structural diagram of an optical zoom lens provided in an embodiment of the present application;

[0051] Figure 3 A schematic diagram of the optical path of the optical zoom lens provided in an embodiment of the present application;

[0052] Figure 4 This is a short-focus MTF diagram of the optical zoom lens provided in an embodiment of the present application;

[0053] Figure 5 This is the mid-focus MTF diagram of the optical zoom lens provided in the embodiments of the present application;

[0054] Figure 6 This is a telephoto MTF diagram of the optical zoom lens provided in an embodiment of the present application;

[0055] Figure 7 A short-focus diagram of the optical zoom lens provided in an embodiment of the present application;

[0056] Figure 8 A diagram showing the mid-focus points of the optical zoom lens provided in an embodiment of the present application;

[0057] Figure 9 This is a long focal length diagram of the optical zoom lens provided in the embodiments of the present application.

[0058] In the figure: 1 - first lens group; 11 - first lens; 12 - second lens; 13 - third lens; 2 - second lens group; 21 - fourth lens; 22 - fifth lens; 23 - sixth lens; 3 - third lens group; 31 - seventh lens; 32 - eighth lens; 4 - fourth lens group; 41 - ninth lens; 42 - tenth lens; 43 - eleventh lens; 44 - twelfth lens; 45 - thirteenth lens; 5 - diaphragm; 6 - filter; 7 - photosensitive element. DETAILED DESCRIPTION

[0059] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0060] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0061] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0062] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0063] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0064] In the description of the present application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0065] It should be noted that the different features in the embodiments of the present application can be combined with each other without conflict.

[0066] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0067] First, the definition of the physical variable "focal power" involved in the present application is explained: the focal power is equal to the difference between the convergence degree of the image beam and the convergence degree of the object beam, which represents the ability of the optical system to deflect light. The focal power is commonly represented by the letter , the refractive power of the spherical surface , where n' is the refractive index of the image side, n is the refractive index of the object side, r is the spherical radius, f' is the image focal length, and f is the object focal length. The general focal power is represented as the inverse of the image focal length.

[0068] From the definition of the focal power, it can be seen that the optical system with positive focal power must converge the light beam, and vice versa, the optical system with negative focal power must diverge the light beam. The focal power is a symbol of the convergence or divergence ability of the optical system to the light beam.

[0069] In one embodiment of the present application, please refer to Figure 1 , the present embodiment provides an optical zoom lens, which comprises, along the optical axis from the object side to the image side,

[0070] The first lens group 1 is a front fixed lens group with positive focal power; here, the first lens group 1 is flexible in composition, as long as the optical lens composition with positive focal power can achieve the technical effect of the present application;

[0071] The first lens group 1 has positive focal power, which plays a role in converging light in the present embodiment, and can converge the incident light; the position of the first lens group 1 and other lens groups is relatively fixed and cannot be moved along the optical axis direction, which is a fixed lens group;

[0072] The second lens group 2 can move relatively along the optical axis direction, which is a variable magnification lens group with negative focal power;

[0073] The second lens group 2 is negative, and functions as a zoom group in the present application. The focal length of the optical system can be changed by moving the second lens group 2 along the optical axis. By moving the second lens group 2 along the optical axis, the size of the object image can be adjusted.

[0074] The third lens group 3 is a rear fixed lens group, and has positive focal length.

[0075] The third lens group 3 has positive focal length, and is arranged between the zoom group and the compensation group. In the present embodiment, the middle fixed group is a cemented group, which is mainly used to correct chromatic aberration.

[0076] The fourth lens group 4 is movable along the optical axis, and is a compensation group having positive focal length. The compensation group is mainly used to compensate for the image surface shift caused by the movement of the zoom group. In the present embodiment, the compensation group is a small aperture lens group, which is beneficial to fast movement and fast focusing.

[0077] In the present embodiment, the first lens group 1, the second lens group 2, the third lens group 3 and the fourth lens group 4 are combined, and the distance between the zoom group and the compensation group is adjusted. The zoom group and the compensation group move according to different movement curves, so that the focal length is continuously changed, the length of the optical system from the short focal length end to the long focal length end is reduced, and a high-resolution zoom optical lens is formed.

[0078] In a possible implementation, the focal lengths f1, f2, f3 and f4 of the first lens group 1, the second lens group 2, the third lens group 3 and the fourth lens group 4 satisfy the following conditions: 60 < f1 < 70; -15 < f2 < -10; 40 < f3 < 50; and 15 < f4 < 20. When the focal lengths of the first lens group 1, the second lens group 2, the third lens group 3 and the fourth lens group 4 satisfy “+”, “-”, “+” and “+”, the focal length configuration required for positive compensation is met. The positive compensation can more easily correct chromatic aberration and secondary spectrum, and the movement trajectory of the compensation group is gentle, so that the zoom ratio of the system can be relatively easily increased.

[0079] In a possible implementation, the optical zoom lens satisfies the following conditions: the focal length f W of the optical zoom lens at the short focal length end is 20, and the total optical length TTL of the optical zoom lens satisfies 12 < TTL / f W < 16, so that a large zoom ratio is achieved under a relatively short lens length.

[0080] In a possible implementation, the optical zoom lens satisfies the following condition: when the optical zoom lens zooms from the short focal end to the long focal end, the moving distance m2 of the second lens group 2 and the moving distance m4 of the fourth lens group 4 satisfy the following condition: 2.6<|m2 / f2|<3.0; 0.3<|m4 / f4|<0.5, where f2 and f4 are focal lengths of the second lens group 2 and the fourth lens group 4.

[0081] In a possible implementation, the moving distance m2 of the second lens group 2 is less than or equal to 33.5 mm.

[0082] In a possible implementation, the moving distance m4 of the fourth lens group 4 is less than or equal to 6.8 mm.

[0083] In a possible implementation, the first lens group 1 includes, in order from the object side to the image side along the optical axis, a first lens 11, a second lens 12, and a third lens 13,

[0084] The first lens 11 is a spherical lens with negative optical power and a concave surface facing the image side;

[0085] The second lens 12 is a spherical lens with positive optical power and a concave surface facing the image side;

[0086] The third lens 13 is a spherical lens with positive optical power and a concave surface facing the image side;

[0087] The concave surface of the first lens 11 and the convex surface of the second lens 12 are cemented together;

[0088] The second lens group 2 includes, in order from the object side to the image side along the optical axis, a fourth lens 21, a fifth lens 22, and a sixth lens 23,

[0089] The fourth lens 21 is a spherical lens with negative optical power and a concave surface facing the image side;

[0090] The fifth lens 22 is a double-concave spherical lens;

[0091] The sixth lens 23 is a spherical lens with positive optical power and a concave surface facing the image side;

[0092] The concave surface of the fifth lens 22 and the convex surface of the sixth lens 23 are cemented together;

[0093] The third lens group 3 includes, in order from the object side to the image side along the optical axis, a seventh lens 31 and an eighth lens 32,

[0094] The seventh lens 31 is a double-convex spherical lens;

[0095] The eighth lens 32 is a spherical lens with negative optical power and a convex surface facing the image side;

[0096] the convex surface of the seventh lens 31 and the concave surface of the eighth lens 32 are cemented;

[0097] the fourth lens group 4 comprises, in order from the object side to the image side along the optical axis, a ninth lens 41, a tenth lens 42, an eleventh lens 43, a twelfth lens 44 and a thirteenth lens 45;

[0098] the ninth lens 41 is a double-convex spherical lens;

[0099] the tenth lens 42 is a double-convex spherical lens;

[0100] the eleventh lens 43 is a double-concave spherical lens;

[0101] the twelfth lens 44 is a double-convex spherical lens;

[0102] the thirteenth lens 45 is a spherical lens with negative power and a convex surface facing the image side;

[0103] the convex surface of the tenth lens 42 and the concave surface of the eleventh lens 43 are cemented, and the convex surface of the twelfth lens 44 and the concave surface of the thirteenth lens 45 are cemented.

[0104] In this application, all the lenses of the lens are glass spherical lenses, which have cost advantages in manufacturing.

[0105] The first lens group 1 adds a positive lens on the basis of one cemented lens, which improves the power bearing capacity of the front fixed group with the highest height of on-axis light, effectively reduces the secondary spectrum aberration of the optical lens, enables the lens to image in a wide spectral range, and significantly improves the resolution, which can be adapted to ultra-high-definition cameras.

[0106] The fourth lens group 4 uses a positive power spherical lens and two cemented lenses in cooperation, eliminates the chromatic aberration of the zoom optical system, balances the aberration of the zoom optical system, and enables the zoom optical system to have good quality at a lower cost.

[0107] In a possible implementation manner, the focal lengths of the first lens 11, the second lens 12, the third lens 13, the fourth lens 21, the fifth lens 22, the sixth lens 23, the seventh lens 31, the eighth lens 32, the ninth lens 41, the tenth lens 42, the eleventh lens 43, the twelfth lens 44 and the thirteenth lens 45 are respectively f Lens1 = -79.1 mm, f Lens2 = 57 mm, f Lens3 = 92.5 mm, f Lens4 = -14.3 mm, f Lens5 = -14.1 mm, f Lens6= 16.2mm, f Lens7 = 11.9mm, f Lens8 = -15.4mm, f Lens9 = 22.1mm, f Lens10 = 14.2mm, f Lens11 = -7mm, f Lens12 = 6.5mm, f Lens13 = -7.2mm.

[0108] In a possible implementation, the thicknesses of the first lens 11, the second lens 12, the third lens 13, the fourth lens 21, the fifth lens 22, the sixth lens 23, the seventh lens 31, the eighth lens 32, the ninth lens 41, the tenth lens 42, the eleventh lens 43, the twelfth lens 44, and the thirteenth lens 45 are respectively: T Lens1 = 2mm, T Lens2 = 6.5mm, T Lens3 = 3.5mm, T Lens4 = 1mm, T Lens5 = 0.8mm, T Lens6 = 2.8mm, T Lens7 = 2.08mm, T Lens8 = 0.8mm, T Lens9 = 1.8mm, T Lens10 = 3.88mm, T Lens11 = 4mm, T Lens12 = 2.78mm, T Lens13 = 1mm.

[0109] In a possible implementation, the optical zoom lens further comprises a diaphragm 5, which is located between the second lens group 2 and the third lens group 3. In this embodiment, by setting the diaphragm 5 fixed between the second lens group 2 and the third lens group 3, the volume of the optical system is reduced, and an optical system with small volume and high resolution is realized.

[0110] In a possible implementation, the optical zoom lens further comprises a filter 6, which is located on the image side of the fourth lens group 4. In this embodiment, the filter 6 functions to eliminate infrared rays and correct incident light. The filter 6 can filter light outside the required waveband to avoid interference of light outside the required waveband.

[0111] In a possible implementation, the air gaps of the air gap between the second lens 12 and the third lens 13, the air gap between the third lens 13 and the fourth lens 21, the air gap between the fourth lens 21 and the fifth lens 22, the air gap between the sixth lens 23 and the diaphragm 5, the air gap between the diaphragm 5 and the seventh lens 31, the air gap between the eighth lens 32 and the ninth lens 41, the air gap between the ninth lens 41 and the tenth lens 42, the air gap between the eleventh lens 43 and the twelfth lens 44, and the air gap between the thirteenth lens 45 and the filter 6 are d1 = 0.1 mm, d2 = 1.5 mm-35 mm, d3 = 4.4 mm, d4 = 1.5 mm-35 mm, d5 = 0.1 mm, d6 = 1.5-8.28 mm, d7 = 0.1 mm, d8 = 0.37 mm, d9 = 4.05-10.83 mm, respectively, where the air gap is the distance between the vertexes of the surfaces of two adjacent lenses.

[0112] In a possible implementation, when the overall optical zoom lens is in the short-focus stage, the medium-focus stage, and the long-focus stage, d2, d4, d6, and d9 can have different values, and the four distances change to achieve the purpose of zooming.

[0113] In an embodiment, typical specific values are shown in Table 1.

[0114] Table 1: Values of air gaps at different focus stages

[0115] Short focus Medium focus Long focus [d2] 1.5 16.7 35 [d4] 35 19.8 1.5 [d6] 8.3 6.19 1.5 [d9] 4.05 6.14 10.83

[0116] In the embodiments of the present application, please refer to Figure 2 , an image-capturing device is also provided, which includes the optical zoom lens and a photosensitive element 7, and the photosensitive element 7 is arranged on the image side of the optical zoom lens and serves as an imaging device. The photosensitive element 7 can be a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS).

[0117] In a possible implementation, the size of the photosensitive element 7 is 1 / 2.7 inch.

[0118] Please refer to Figure 3 , Figure 3 A possible lens structure is provided, please refer to Figures 4-9 , the embodiments provide the imaging effect of the lens, Figures 4-6 The larger the area enclosed by the lines and the X-axis, the better the imaging contrast, Figures 7-9 The smaller the spot size, the higher the resolution.

[0119] In a third aspect, the embodiments of the present application provide an electronic device, which includes a shell and an image-capturing device as described above, and the image-capturing device is arranged on the shell.

[0120] In summary, the embodiment provides an optical zoom lens, an image capturing device and an electronic device, by reasonably setting the effects of the four lens groups, a large range of high-definition imaging of targets at different distances and high-speed motion is achieved, the central resolution of the zoom optical system is higher than 300 lp / mm (line pairs per millimeter), compared with the existing resolution of 720P and 1080P lenses, the resolution is obviously improved; by reasonably configuring the optical lenses in the four lens groups, the four groups adopt the optical power configurations of “+”, “-”, “+” and “+” in turn, to achieve large zoom and better imaging effect. In addition, the optical devices used in the present application: the first lens 11, the second lens 12, the third lens 13, the fourth lens 21, the fifth lens 22, the sixth lens 23, the seventh lens 31, the eighth lens 32, the ninth lens 41, the tenth lens 42, the eleventh lens 43, the twelfth lens 44 and the thirteenth lens 45 have an average relative cost of only 4.95 yuan per piece, and the overall system cost is low.

[0121] It should be noted that, in the present text, relational terms such as first and second and the like can only be used to distinguish one entity or action from another entity or action, without necessarily requiring or implying that there is any such actual relationship or order between these entities or actions. Moreover, the terms “comprises”, “comprising” or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article or device that includes a list of elements does not only include those elements, but also includes other elements not explicitly listed, or further includes elements inherent in such a process, method, article or device. Without more limitations, the element defined by the statement “comprises a” does not exclude the presence of additional identical elements in the process, method, article or device that includes the element.

[0122] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An optical zoom lens, characterized in that: The optical zoom lens includes, in order from the object side to the image side along the optical axis, a first lens group, the first lens group being a front fixed lens group and having positive optical power; a second lens group, which is relatively movable along the optical axis and is a variable magnification lens group having negative optical power; a third lens group, the third lens group being a rear fixed lens group and having positive optical power; The fourth lens group is relatively movable along the optical axis, is a compensation lens group, and has positive optical power.

2. The optical zoom lens according to claim 1, wherein: The focal lengths f1, f2, f3, and f4 of the first lens group, the second lens group, the third lens group, and the fourth lens group satisfy the following conditions: 60 < f1 < 70; -15 < f2 < -10; 40<f3<50; 15<f4<20.

3. The optical zoom lens according to claim 1, wherein: The focal length f of the optical zoom lens when it is at the short focal end W The total optical length TTL of the optical zoom lens satisfies: 12<TTL / f W <16.

4. The optical zoom lens according to claim 3, wherein: When the optical zoom lens is zoomed from the short focal end to the long focal end, the moving distance m2 of the second lens group and the moving distance m4 of the fourth lens group satisfy the following conditions: 2.6<|m2 / f2|<3.0; 0.3<|m4 / f4|<0.5, where f2 and f4 are the focal lengths of the second lens group and the fourth lens group.

5. The optical zoom lens according to claim 4, wherein: The moving distance m2 of the second lens group is ≤33.5 mm, and the moving distance m4 of the fourth lens group is ≤6.8 mm.

6. The optical zoom lens according to claim 1, wherein: The first lens group includes a first lens, a second lens, and a third lens arranged in sequence from the object side to the image side along the optical axis. The first lens is a spherical lens with negative optical power and a concave surface facing the image side; The second lens is a spherical lens with positive optical power and a concave surface facing the image side; The third lens is a spherical lens with positive optical power and a concave surface facing the image side; The concave surface of the first lens and the convex surface of the second lens are cemented together; The second lens group includes a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. The fourth lens is a spherical lens with negative optical power and a concave surface facing the image side; The fifth lens is a biconcave spherical lens; The sixth lens is a spherical lens with positive optical power and a concave surface facing the image side; The concave surface of the fifth lens and the convex surface of the sixth lens are cemented together; The third lens group includes a seventh lens and an eighth lens arranged in sequence from the object side to the image side along the optical axis. The seventh lens is a biconvex spherical lens; The eighth lens is a spherical lens with negative optical power and a convex surface facing the image side; The convex surface of the seventh lens and the concave surface of the eighth lens are cemented together; The fourth lens group includes a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens, which are sequentially arranged from the object side to the image side along the optical axis; The ninth lens is a biconvex spherical lens; The tenth lens is a biconvex spherical lens; The eleventh lens is a biconcave spherical lens; The twelfth lens is a biconvex spherical lens; The thirteenth lens is a spherical lens with negative optical power and a convex surface facing the image side; The convex surface of the tenth lens is cemented to the concave surface of the eleventh lens, and the convex surface of the twelfth lens is cemented to the concave surface of the thirteenth lens.

7. The optical zoom lens according to claim 6, wherein: The focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, and the thirteenth lens are respectively: f Lens1 =-79.1mm, f Lens2 =57mm, f Lens3 =92.5mm, f Lens4 =-14.3mm, f Lens5 =-14.1mm, f Lens6 =16.2mm, f Lens7 =11.9mm, f Lens8 =-15.4mm, f Lens9 =22.1mm, f Lens10 =14.2mm, f Lens11 =-7mm, f Lens12 =6.5mm, f Lens13 =-7.2mm.

8. The optical zoom lens according to claim 6, wherein: The thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, and the thirteenth lens are respectively: T Lens1 =2mm, T Lens2 =6.5mm, T Lens3 =3.5mm, T Lens4 =1mm, T Lens5 =0.8mm, T Lens6 =2.8mm, T Lens7 =2.08mm, T Lens8 =0.8mm, T Lens9 =1.8mm, T Lens10 =3.88mm, T Lens11 =4mm, T Lens12 =2.78mm, T Lens13 =1mm.

9. The optical zoom lens according to claim 6, wherein: The optical zoom lens further includes a stop located between the second lens group and the third lens group.

10. The optical zoom lens according to claim 6, wherein: The optical zoom lens further includes a filter, which is located on the image side of the fourth lens group.

11. The optical zoom lens according to claim 6, wherein the air spacings between the second and third lenses, the air spacing between the third and fourth lenses, the air spacing between the fourth and fifth lenses, the air spacing between the sixth lens and the aperture, the air spacing between the aperture and the seventh lens, the air spacing between the eighth and ninth lenses, the air spacing between the ninth and tenth lenses, the air spacing between the eleventh and twelfth lenses, and the air spacing between the thirteenth lens and the filter are, respectively, d1 = 0.1 mm, d2 = 1.5 mm to 35 mm, d3 = 4.4 mm, d4 = 1.5 mm to 35 mm, d5 = 0.1 mm, d6 = 1.5 to 8.28 mm, d7 = 0.1 mm, d8 = 0.37 mm, and d9 = 4.05 to 10.83 mm.

12. An imaging device, comprising the optical zoom lens according to any one of claims 1 to 11 and a photosensitive element, wherein the photosensitive element is arranged on the image side of the optical zoom lens.

13. The imaging device according to claim 12, wherein: The size of the photosensitive element is 1 / 2.7 inch. 14 . An electronic device comprising a housing and the imaging device according to claim 12 , wherein the imaging device is arranged on the housing.

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