Zoom lens and shooting device

Abstract

The invention discloses a zoom lens and shooting equipment, the zoom lens comprises: a first fixed lens group, a zoom lens group, an aperture, a second fixed lens group, a focus lens group, and a flat glass, which are arranged in sequence from the object side to the image side along the optical axis, and have a focal power of positive-negative-positive-positive; the first fixed lens group comprises first to third lenses with a focal power of negative-positive-positive, and the first, second and third lenses are glued together to form a double glued lens group; the zoom lens group comprises fourth to sixth lenses with a focal power of negative-negative-positive; the second fixed lens group comprises seventh to eleventh lenses with a focal power of positive-positive-negative-positive-negative, and the ninth to eleventh lenses are glued together to form a triple glued lens group; the focus lens group comprises twelfth to fifteenth lenses with a focal power of positive-negative-positive-positive. Thus, through the above design, the zoom lens achieves the effects of zooming, variable aperture, low distortion and compact structure.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and in particular to a zoom lens and a shooting device. Background Art

[0002] A zoom lens is a lens system that can change its focal length within a certain range, thereby obtaining different widths of field of view and different ranges of scenery. Without changing the shooting distance, a zoom lens can change the shooting range by changing the focal length. The speed of changing the focal length is incomparable to that of a fixed focal length lens by changing the lens. Existing zoom lenses are prone to distortion and have problems such as unclear images, low resolution, small aperture, uneven illumination of the image plane during zooming, lengthy structure, and high cost. Summary of the invention

[0003] The present invention provides a zoom lens and shooting equipment to solve the problems of easy distortion of the zoom lens and unclear images, low resolution, small aperture, uneven illumination of the image plane during zooming, lengthy structure, high cost, etc.

[0004] To solve the above problem, a first embodiment of the present invention provides a zoom lens, comprising:

[0005] Arranged in sequence along the optical axis from the object side to the image side are a first fixed lens group with positive focal power, a zoom lens group with negative focal power, an aperture, a second fixed lens group with positive focal power, a focus lens group with positive focal power, and a flat glass;

[0006] The first fixed lens group includes a first lens with negative optical power, a second lens with positive optical power, and a third lens with positive optical power, wherein the first lens and the second lens are cemented together to form a doublet lens group;

[0007] The zoom lens group includes a fourth lens with negative optical power, a fifth lens with negative optical power, and a sixth lens with positive optical power;

[0008] The second fixed lens group includes a seventh lens with positive optical power, an eighth lens with positive optical power, a ninth lens with negative optical power, a tenth lens with positive optical power and an eleventh lens with negative optical power, and the ninth lens, the tenth lens and the eleventh lens are cemented together to form a triplet lens group;

[0009] The focusing lens group includes a twelfth lens with positive optical power, a thirteenth lens with negative optical power, a fourteenth lens with positive optical power, and a fifteenth lens with positive optical power.

[0010] Optionally, at least two lenses in the first fixed lens group are made of glass;

[0011] At least one lens in the zoom lens group is made of glass;

[0012] At least one lens in the second fixed lens group is an aspherical lens;

[0013] At least one lens in the focus lens group is made of glass.

[0014] Optionally, the optical power of the first fixed lens group is The optical power of the zoom lens group The optical power of the second fixed lens group The focal power of the focus lens group The following relations are satisfied:

[0015]

[0016]

[0017]

[0018] Optionally, the optical power of the first lens to the eleventh lens is equal to the optical power of the zoom lens group. Satisfies the following relationship:

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

[0025] The optical power of the twelfth lens to the fifteenth lens and the optical power of the focusing lens group Satisfies the following relationship:

[0026]

[0027] in, to Respectively represent the optical powers of the first lens to the fifteenth lens.

[0028] Optionally, the optical power of the triplet lens group is The focal length of the zoom lens at the telephoto end The relationship between them satisfies:

[0029]

[0030] Optionally, the total length TTL of the zoom lens and the moving distance S2 of the zoom lens group satisfy the following relationship:

[0031] 3.0≤TTL / S2≤4.0.

[0032] Optionally, the focal length of the zoom lens at the telephoto end is The focal length of the zoom lens at the wide angle end The relationship between them satisfies:

[0033]

[0034] Optionally, the distance between the zoom lens group and the first fixed lens group varies in a range of 0.57 to 21.3;

[0035] The distance between the zoom lens group and the second fixed lens group varies in a range of 0.57 to 21.4;

[0036] The distance between the focus lens group and the second fixed lens group varies in a range of 2.3 to 3.6;

[0037] The distance between the focus lens group and the flat glass varies in a range of 2.5 to 4.0.

[0038] Optionally, the refractive index Nd1 of the first lens to the refractive index Nd15 of the fifteenth lens satisfy the following relationship:

[0039] 1.75≤Nd1≤2.0; 1.4≤Nd2≤1.45; 1.4≤Nd3≤1.55; 1.8≤Nd4≤2.0;

[0040] 1.5≤Nd5≤1.75; 1.6≤Nd6≤2.0; 1.5≤Nd7≤1.65; 1.55≤Nd8≤1.65; 1.6≤Nd9≤1.8; 1.5≤Nd10≤1.7; 1.6≤Nd11≤1.7; 1.55≤Nd12≤1.8;

[0041] 1.6≤Nd13≤1.7; 1.5≤Nd14≤1.6; 1.5≤Nd15≤1.7.

[0042] Optionally, the aperture size of the aperture varies in the range of 6.3 to 7.4, and the aperture position is fixed.

[0043] To solve the above problem, a second aspect of the present invention provides a photographing device, comprising the zoom lens as described in any embodiment of the present invention.

[0044] According to the zoom lens and shooting equipment proposed in the embodiments of the present invention, the zoom lens comprises: a first fixed lens group with positive focal power, a zoom lens group with negative focal power, an aperture, a second fixed lens group with positive focal power, a focus lens group with positive focal power and a flat glass are arranged in sequence along the optical axis from the object side to the image side; the first fixed lens group comprises a first lens with negative focal power, a second lens with positive focal power and a third lens with positive focal power, wherein the first lens and the second lens are cemented into a double cemented lens group; the zoom lens group comprises The fourth lens with negative focal power, the fifth lens with negative focal power, and the sixth lens with positive focal power; the second fixed lens group includes the seventh lens with positive focal power, the eighth lens with positive focal power, the ninth lens with negative focal power, the tenth lens with positive focal power, and the eleventh lens with negative focal power, and the ninth lens, the tenth lens, and the eleventh lens are cemented into a triplet lens group; the focusing lens group includes the twelfth lens with positive focal power, the thirteenth lens with negative focal power, the fourteenth lens with positive focal power, and the fifteenth lens with positive focal power. Thus, through the above design, the zoom lens achieves the effects of zoom, variable aperture, low distortion, and compact structure.

[0045] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 these drawings without creative work.

[0047] Figure 1 is a schematic diagram of the wide-angle end structure of the zoom lens provided in the first embodiment of the present invention;

[0048] Figure 2 for Figure 1 Axial aberration curve of the zoom lens shown;

[0049] Figure 3 for Figure 1 Ray fan diagram of the zoom lens shown;

[0050] Figure 4 for Figure 1 Field curvature distortion curve diagram of the zoom lens shown;

[0051] Figure 5 is a schematic diagram of the telephoto end structure of the zoom lens provided in the first embodiment of the present invention;

[0052] Figure 6 for Figure 5 Axial aberration curve of the zoom lens shown;

[0053] Figure 7 for Figure 5 Ray fan diagram of the zoom lens shown;

[0054] Figure 8 for Figure 5 Field curvature distortion curve diagram of the zoom lens shown;

[0055] Fig. 9 is a schematic diagram of the wide-angle end structure of the zoom lens provided in the second embodiment of the present invention;

[0056] Fig.10 for Fig. 9 Axial aberration curve of the zoom lens shown;

[0057] Fig.11 for Fig. 9 Ray fan diagram of the zoom lens shown;

[0058] Fig.12 for Fig. 9 Field curvature distortion curve diagram of the zoom lens shown;

[0059] Fig.13 is a schematic diagram of the telephoto end structure of the zoom lens proposed in Embodiment 2 of the present invention;

[0060] Fig.14 for Fig.13 Axial aberration curve of the zoom lens shown;

[0061] Fig.15 for Fig.13 Ray fan diagram of the zoom lens shown;

[0062] Fig.16 for Fig.13 Field curvature distortion curve diagram of the zoom lens shown;

[0063] Fig.17 is a schematic diagram of the wide-angle end structure of the zoom lens provided in Embodiment 3 of the present invention;

[0064] Fig.18 for Fig.17 Axial aberration curve of the zoom lens shown;

[0065] Fig.19 for Fig.17 Ray fan diagram of the zoom lens shown;

[0066] Fig. 20 for Fig.17 Field curvature distortion curve diagram of the zoom lens shown;

[0067] Fig.21 is a schematic diagram of the telephoto end structure of the zoom lens proposed in Embodiment 3 of the present invention;

[0068] Fig. 22 for Fig.21 Axial aberration curve of the zoom lens shown;

[0069] Fig.23 for Fig.21 Ray fan diagram of the zoom lens shown;

[0070] Fig.24 for Fig.21 Field curvature distortion curve of the zoom lens shown. DETAILED DESCRIPTION

[0071] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0072] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0073] The zoom lens proposed in the embodiment of the present invention is a glass-plastic hybrid lens, which can achieve low cost and can also control aberrations, distortions, etc. within a certain range, and can also achieve clear pictures, high resolution, large aperture, uniform image plane illumination during zooming, and compact structure.

[0074] Figure 1 Schematic diagram of the wide-angle end structure of the zoom lens proposed in Embodiment 1 of the present invention. Figure 1 As shown, the zoom lens includes:

[0075] Arranged in sequence along the optical axis from the object side to the image side are a first fixed lens group G1 with positive focal power, a zoom lens group G2 with negative focal power, an aperture STO, a second fixed lens group G3 with positive focal power, a focus lens group G4 with positive focal power, and a flat glass PD;

[0076] The first fixed lens group G1 includes a first lens with negative optical power, a second lens with positive optical power, and a third lens with positive optical power, wherein the first lens and the second lens are cemented together to form a doublet lens group;

[0077] The zoom lens group G2 includes a fourth lens having negative optical power, a fifth lens having negative optical power, and a sixth lens having positive optical power;

[0078] The second fixed lens group G3 includes a seventh lens with positive focal power, an eighth lens with positive focal power, a ninth lens with negative focal power, a tenth lens with positive focal power and an eleventh lens with negative focal power, and the ninth lens, the tenth lens and the eleventh lens are cemented together to form a triplet lens group;

[0079] The focus lens group G4 includes a twelfth lens having positive refractive power, a thirteenth lens having negative refractive power, a fourteenth lens having positive refractive power, and a fifteenth lens having positive refractive power.

[0080] Therefore, by setting the first fixed lens group G1, the zoom lens group G2, the second fixed lens group G3, and the focus lens group G4, the positions of the zoom lens group G2 and the focus lens group G4 on the optical axis are changed, so that the zoom lens can be switched between the wide-angle end and the telephoto end. In addition, the fixation of the first fixed lens group G1 and the second fixed lens group G3 makes the overall length of the zoom lens relatively compact.

[0081] Optionally, at least two lenses in the first fixed lens group G1 are made of glass;

[0082] At least one lens in the zoom lens group G2 is made of glass;

[0083] At least one lens in the second fixed lens group G3 is an aspherical lens;

[0084] At least one lens in the focus lens group G4 is made of glass.

[0085] It is understandable that after removing the glass lens in each lens group, the remaining lenses are all made of plastic, and vice versa, after removing the plastic lens in the lens group, the remaining lenses are all made of glass, and the above-mentioned aspherical lens is a plastic lens. Therefore, the reasonable combination of glass-plastic hybrid materials can significantly reduce the weight of the lens, and compared with glass lenses, plastic lenses also have obvious cost advantages.

[0086] Optionally, the optical power of the first fixed lens group is Optical power of zoom lens group The optical power of the second fixed lens group Refractive power of focusing lens group The following relations are satisfied:

[0087]

[0088] Optionally, the optical power of the first lens to the eleventh lens is equal to the optical power of the zoom lens group. Satisfies the following relationship:

[0089]

[0090]

[0091]

[0092] The refractive power of the twelfth to fifteenth lenses and the refractive power of the focusing lens group Satisfies the following relationship:

[0093]

[0094]

[0095] in, to Represent the optical powers of the first to fifteenth lenses respectively.

[0096] Therefore, by combining the optical power of the four groups into positive-negative-positive-positive and reasonably allocating the optical power of each group and the optical power of the elements within the group, the lens can effectively achieve small distortion and high-definition imaging, and also ensure that the lens has a relatively compact overall length. This zoom lens comprehensively takes into account the characteristics of zoom, variable aperture, low distortion and compact structure.

[0097] Optionally, the optical power of the triplet lens group The focal length of the telephoto end of the zoom lens The relationship between them satisfies:

[0098] Among them, the focal length in the glued lens group is negative, positive and negative respectively, and the focal length after glueing is very small, ensuring that the light is basically not deflected within this range, avoiding the generation of more serious high-level aberrations. Compared with the commonly used double glued lens group, the use of the triple glued lens group can better suppress chromatic aberration and improve image quality; the triple glued lens group is located in the second fixed lens group G3, which can effectively minimize the residual chromatic aberration of the first three components of the zoom lens, thereby reducing the burden of the focus lens group G4 on the correction of the residual aberration of the system.

[0099] Optionally, the total length TTL of the zoom lens and the moving distance S2 of the zoom lens group satisfy the following relationship:

[0100] 3.0≤TTL / S2≤4.0.

[0101] The limitation of the moving distance of the zoom lens group G2 and the total length of the lens can compress the lens space and ensure that the required imaging quality and zoom level are met under the condition of a small lens volume.

[0102] Optionally, the focal length of the zoom lens at the telephoto end is The focal length of a zoom lens at the wide angle The relationship between them satisfies: It is beneficial to correct aberration and improve image quality.

[0103] Optionally, the distance between the zoom lens group and the first fixed lens group varies in a range of 0.57 to 21.3;

[0104] The distance between the zoom lens group and the second fixed lens group varies in the range of 0.57 to 21.4;

[0105] The distance between the focus lens group and the second fixed lens group varies in a range of 2.3 to 3.6;

[0106] The distance between the focusing lens group and the flat glass varies from 2.5 to 4.0.

[0107] Thus, the position changes of the zoom lens group and the focus lens group realize the change between the wide-angle end and the telephoto end.

[0108] Optionally, the refractive index Nd1 of the first lens to the refractive index Nd15 of the fifteenth lens satisfy the following relationship:

[0109] 1.75≤Nd1≤2.0; 1.4≤Nd2≤1.45; 1.4≤Nd3≤1.55; 1.8≤Nd4≤2.0;

[0110] 1.5≤Nd5≤1.75; 1.6≤Nd6≤2.0; 1.5≤Nd7≤1.65; 1.55≤Nd8≤1.65; 1.6≤Nd9≤1.8; 1.5≤Nd10≤1.7; 1.6≤Nd11≤1.7; 1.55≤Nd12≤1.8;

[0111] 1.6≤Nd13≤1.7; 1.5≤Nd14≤1.6; 1.5≤Nd15≤1.7. This helps to reduce the tolerance sensitivity of the lens and improve the consistency of image quality.

[0112] Optionally, the aperture size of the diaphragm varies from 6.3 to 7.4, and the aperture position is fixed. The aperture size of the diaphragm can be varied to ensure uniform brightness of the imaging image during the zooming process.

[0113] An embodiment of the present invention further provides a photographing device, comprising the zoom lens as described in any embodiment of the present invention.

[0114] The zoom lens provided by the present invention is described below with reference to specific embodiments.

[0115] Embodiment 1

[0116] Figure 1 is a schematic diagram of the wide-angle end structure of the zoom lens provided in the first embodiment of the present invention; Figure 5 Schematic diagram of the telephoto end structure of the zoom lens proposed in Embodiment 1 of the present invention; Figure 1 , and combined with Figure 5 The zoom lens comprises: a first fixed lens group G1 with positive focal power, a zoom lens group G2 with negative focal power, an aperture STO, a second fixed lens group G3 with positive focal power, a focus lens group G4 with positive focal power and a flat glass PD are sequentially arranged along the optical axis from the object side to the image side;

[0117] The first fixed lens group G1 includes a first lens 11 with negative optical power, a second lens 12 with positive optical power, and a third lens 13 with positive optical power, wherein the first lens 11 and the second lens 12 are cemented into a doublet lens group; the zoom lens group G2 includes a fourth lens 14 with negative optical power, a fifth lens 15 with negative optical power, and a sixth lens 16 with positive optical power; the second fixed lens group G3 includes a seventh lens 17 with positive optical power, an eighth lens 18 with positive optical power, a ninth lens 19 with negative optical power, a tenth lens 110 with positive optical power, and an eleventh lens 111 with negative optical power, wherein the ninth lens 19, the tenth lens 110, and the eleventh lens 111 are cemented into a triplet lens group; the focusing lens group G4 includes a twelfth lens 112 with positive optical power, a thirteenth lens 113 with negative optical power, a fourteenth lens 114 with positive optical power, and a fifteenth lens 115 with positive optical power.

[0118] Among them, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, the seventh lens 17, the ninth lens 19, the tenth lens 110, the eleventh lens 111, and the twelfth lens 112 are made of glass, and the eighth lens 18, the thirteenth lens 113, the fourteenth lens 114, and the fifteenth lens 115 are made of plastic.

[0119] Among them, the optical power of the first fixed lens group Optical power of zoom lens group The optical power of the second fixed lens group Refractive power of focusing lens group The following relations are satisfied:

[0120]

[0121] The refractive power of the first lens 11 to the eleventh lens 111 and the refractive power of the zoom lens group Satisfies the following relationship:

[0122]

[0123]

[0124]

[0125] The refractive power of the twelfth to fifteenth lenses 112 to 115 and the refractive power of the focus lens group G4 Satisfies the following relationship:

[0126]

[0127] in, to They respectively represent the optical powers of the first lens 11 to the fifteenth lens 115 .

[0128] Among them, the focal length of the triplet lens group is The focal length of the telephoto end of the zoom lens The relationship between them satisfies:

[0129]

[0130] Among them, the focal length of the zoom lens at the telephoto end The focal length of a zoom lens at the wide angle The relationship between them satisfies:

[0131] The total length TTL of the zoom lens and the moving distance S2 of the zoom lens group satisfy the following relationship:

[0132] TTL / S2=3.804.

[0133] In the present invention, the aspherical lens of the zoom lens satisfies the following formula:

[0134]

[0135] Where Z is the axial distance from the curved surface at a position perpendicular to the optical axis at a height r to the vertex of the surface along the optical axis; c represents the curvature at the vertex of the aspheric surface; a4, a6, a8, a10, a12, a14, a16 are the high-order aspheric coefficients of the corresponding aspheric surface of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order, a i r i The combination becomes the high-order terms corresponding to the aspherical surface.

[0136] In this embodiment, the optical physical parameters of the first lens 11 to the fifteenth lens 115 are as follows:

[0137] Table 1 Design values ​​of the zoom lens of Example 1

[0138]

[0139]

[0140] Table 2 Zoom intervals and parameter specifications of the zoom lens at the wide-angle end and the telephoto end of Example 1

[0141]

[0142] The surface numbers S1-S30 in Table 1 are numbered according to the surface order of each lens, "STO" represents the aperture of the lens; the radius of curvature represents the degree of curvature of the corresponding lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, wherein "INF" indicates that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and a space represents that the current position is air with a refractive index of 1; Table 2 shows the zoom interval and parameter specifications of a large aperture zoom lens at the wide-angle end and the telephoto end; Table 3 shows the aspheric coefficient values ​​used in the current embodiment.

[0143] Table 3-1 a4-a10 aspheric coefficients of the zoom lens of Example 1

[0144] Surface number a4 a6 a8 a10 S15 -2.48649E-04 -3.69779E-06 2.20733E-08 1.19003E-10 S16 -2.05306E-04 -5.47959E-06 5.33992E-08 6.74120E-10 S23 -1.15136E-04 -7.16265E-06 2.10114E-06 -6.00852E-08 S24 -1.71489E-03 1.20386E-04 -2.20494E-06 -3.13077E-08 S25 -1.80888E-03 -2.71054E-05 2.67414E-06 -1.20803E-08 S26 2.81724E-03 -2.49389E-04 7.73232E-07 1.86249E-07 S27 2.00810E-03 -9.34933E-05 -3.54670E-06 7.85478E-08 S28 -2.02905E-04 3.12394E-06 -1.68194E-06 -3.31772E-08

[0145] Table 3-2 a12-a16 aspheric coefficients of the zoom lens of Example 1

[0146]

[0147]

[0148] Figure 2 for Figure 1The axial aberration curve of the zoom lens shown in the figure shows the normalized aperture in the vertical direction, with 0 being on the optical axis and the vertical vertex representing the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus in millimeters (mm). The different linear curves in the figure represent different wavelengths of system imaging, which are represented by Figure 2 It can be seen that the axial aberrations at different wavelengths are all controlled within the range of (-0.15mm, +0.15mm), indicating that the spherical aberration of the zoom lens at each wavelength is well controlled and can meet the needs of spectral applications.

[0149] Figure 3 for Figure 1 The ray fan diagram of the zoom lens is shown in the figure. The ray fan diagram is one of the evaluation methods commonly used by optical designers. Figure 3 As shown. In a single figure, the horizontal axis is the normalized beam aperture, and the vertical axis is the vertical axis aberration. Ideally, each curve should completely coincide with the horizontal axis, and all light rays in the field of view are focused on the same point on the image plane; the vertical axis in a single image can also be expressed as the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. Figure 3 It can be seen that the zoom lens is close to the horizontal axis at each wavelength in each field of view, indicating that the vertical axis aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously scattered, indicating that the zoom lens also has good correction for chromatic aberration, ensuring the imaging requirements of the zoom lens to form clear images in the full band.

[0150] Figure 4 for Figure 1 The field curvature distortion curve of the zoom lens is shown in the figure. In the left coordinate system of the figure, the horizontal coordinate represents the field curvature of the zoom lens, and the unit is mm; the vertical coordinate represents the normalized image height, and there is no unit; T represents the meridian, and S represents the arc loss; Figure 4 It can be seen that the field curvature of the lens provided in this embodiment is effectively controlled, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the size of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Figure 4 It can be seen that the distortion of the lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0151] Figure 6 for Figure 5 The axial aberration curve of the zoom lens shown in the figure shows the normalized aperture in the vertical direction, with 0 being on the optical axis and the vertical vertex representing the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus in millimeters (mm). The different linear curves in the figure represent different wavelengths of system imaging, which are represented by Figure 6It can be seen that the axial aberrations at different wavelengths are all controlled within the range of (-0.1mm, +0.1mm), indicating that the spherical aberration of the zoom lens at each wavelength is well controlled and can meet the needs of spectral applications.

[0152] Figure 7 for Figure 5 The ray fan diagram of the zoom lens is shown in Figure 1. Figure 7 As shown. In a single figure, the horizontal axis is the normalized beam aperture, and the vertical axis is the vertical axis aberration. Ideally, each curve should completely coincide with the horizontal axis, and all light rays in the field of view are focused on the same point on the image plane; the vertical axis in a single image can also be expressed as the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. Figure 7 It can be seen that the zoom lens is close to the horizontal axis at each wavelength in each field of view, indicating that the vertical axis aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously scattered, indicating that the zoom lens also has good correction for chromatic aberration, ensuring the imaging requirements of the zoom lens to form clear images in the full band.

[0153] Figure 8 for Figure 5 The field curvature distortion curve of the zoom lens is shown in the figure. In the left coordinate system of the figure, the horizontal coordinate represents the field curvature of the zoom lens, and the unit is mm; the vertical coordinate represents the normalized image height, and there is no unit; T represents the meridian, and S represents the arc loss; Figure 8 It can be seen that the field curvature of the lens provided in this embodiment is effectively controlled, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the size of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Figure 8 It can be seen that the distortion of the lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0154] Embodiment 2

[0155] Fig. 9 is a schematic diagram of the wide-angle end structure of the zoom lens provided in the second embodiment of the present invention; Fig.13 is a schematic diagram of the telephoto end structure of the zoom lens proposed in Embodiment 2 of the present invention; Fig. 9 , and combined with Fig.13 The zoom lens comprises: a first fixed lens group G1 with positive focal power, a zoom lens group G2 with negative focal power, an aperture STO, a second fixed lens group G3 with positive focal power, a focus lens group G4 with positive focal power and a flat glass PD are sequentially arranged along the optical axis from the object side to the image side;

[0156] The first fixed lens group G1 includes a first lens 21 with negative optical power, a second lens 22 with positive optical power, and a third lens 23 with positive optical power, wherein the first lens 21 and the second lens 22 are cemented into a doublet lens group; the zoom lens group G2 includes a fourth lens 24 with negative optical power, a fifth lens 25 with negative optical power, and a sixth lens 26 with positive optical power; the second fixed lens group G3 includes a seventh lens 27 with positive optical power, an eighth lens 28 with positive optical power, a ninth lens 29 with negative optical power, a tenth lens 210 with positive optical power, and an eleventh lens 211 with negative optical power, wherein the ninth lens 29, the tenth lens 210, and the eleventh lens 211 are cemented into a triplet lens group; the focusing lens group G4 includes a twelfth lens 212 with positive optical power, a thirteenth lens 213 with negative optical power, a fourteenth lens 214 with positive optical power, and a fifteenth lens 215 with positive optical power.

[0157] Among them, the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the seventh lens 27, the ninth lens 29, the tenth lens 210, the eleventh lens 211, and the twelfth lens 212 are made of glass, and the fifth lens 25, the sixth lens 26, the eighth lens 28, the thirteenth lens 213, the fourteenth lens 214, and the fifteenth lens 215 are made of plastic.

[0158] Among them, the optical power of the first fixed lens group Optical power of zoom lens group The optical power of the second fixed lens group Refractive power of focusing lens group The following relations are satisfied:

[0159]

[0160] The refractive power of the first lens 21 to the eleventh lens 211 and the refractive power of the zoom lens group Satisfies the following relationship:

[0161]

[0162]

[0163]

[0164] The refractive power of the twelfth to fifteenth lenses 212 to 215 and the refractive power of the focus lens group G4 Satisfies the following relationship:

[0165]

[0166] in, to They respectively represent the optical powers of the first lens 21 to the fifteenth lens 215 .

[0167] Among them, the focal length of the triplet lens group is The focal length of the telephoto end of the zoom lens The relationship between them satisfies:

[0168]

[0169] Among them, the focal length of the zoom lens at the telephoto end The focal length of a zoom lens at the wide angle The relationship between them satisfies:

[0170] The total length TTL of the zoom lens and the moving distance S2 of the zoom lens group satisfy the following relationship:

[0171] TTL / S2=3.500.

[0172] In the present invention, the aspherical lens of the zoom lens satisfies the following formula:

[0173]

[0174] Where Z is the axial distance from the curved surface at a position perpendicular to the optical axis at a height r to the vertex of the surface along the optical axis; c represents the curvature at the vertex of the aspheric surface; a4, a6, a8, a10, a12, a14, a16 are the high-order aspheric coefficients of the corresponding aspheric surface of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order, a i r i The combination becomes the high-order terms corresponding to the aspherical surface.

[0175] In this embodiment, the optical physical parameters of the first lens 21 to the fifteenth lens 215 are as follows:

[0176] Table 4 Design values ​​of the zoom lens of Example 2

[0177]

[0178]

[0179] Table 5 Zoom intervals and parameter specifications of the zoom lens at the wide-angle end and the telephoto end of Example 2

[0180]

[0181]

[0182] The surface numbers S1-S30 in Table 4 are numbered according to the surface order of each lens, "STO" represents the aperture of the lens; the radius of curvature represents the curvature degree of the corresponding lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, wherein "INF" indicates that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and a space represents that the current position is air and the refractive index is 1; Table 5 shows the zoom interval and parameter specifications of the wide-angle end and telephoto end of the zoom lens of Example 2; Table 6 shows the aspheric coefficient values ​​used in the current example.

[0183] Table 6-1 a4-a10 aspheric coefficients of the zoom lens of Example 2

[0184] Surface number a4 a6 a8 a10 S8 1.85584E-05 -2.99104E-07 -2.95506E-08 1.01226E-09 S9 -6.07043E-05 -1.49157E-06 -6.37278E-09 2.39774E-10 S10 2.79670E-06 -4.38872E-07 2.50868E-08 -6.34932E-10 S11 -2.47996E-06 1.13226E-07 5.81476E-09 7.22495E-13 S15 -9.09351E-05 -1.49612E-06 -1.02839E-08 -2.32315E-10 S16 -7.36636E-05 -1.54659E-06 -2.51384E-08 1.04970E-12 S23 -1.67974E-04 1.63163E-05 7.35125E-07 -4.34874E-08 S24 -2.13443E-03 1.26400E-04 -2.58157E-06 -5.72441E-09 S25 -8.77434E-04 1.74966E-05 4.45183E-08 -2.63173E-08 S26 2.00147E-04 -3.57273E-05 -6.01735E-08 2.65325E-08 S27 1.18469E-04 -3.10205E-06 -1.17725E-06 3.56115E-08 S28 2.29179E-04 -2.61290E-05 -4.30299E-07 1.78357E-08

[0185] Table 6-2 a12-a16 aspheric coefficients of the zoom lens of Example 2

[0186]

[0187]

[0188] Fig.10 for Fig. 9 The axial aberration curve of the zoom lens shown in the figure shows the normalized aperture in the vertical direction, with 0 being on the optical axis and the vertical vertex representing the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus in millimeters (mm). The different linear curves in the figure represent different wavelengths of system imaging, which are represented by Fig.10 It can be seen that the axial aberrations at different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the spherical aberration of the zoom lens at each wavelength is well controlled and can meet the needs of spectral applications.

[0189] Fig.11 for Fig. 9 The ray fan diagram of the zoom lens is shown in the figure. The ray fan diagram is one of the evaluation methods commonly used by optical designers. Fig. 9 As shown. In a single figure, the horizontal axis is the normalized beam aperture, and the vertical axis is the vertical axis aberration. Ideally, each curve should completely coincide with the horizontal axis, and all light rays in the field of view are focused on the same point on the image plane; the vertical axis in a single image can also be expressed as the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. Fig.11It can be seen that the zoom lens is close to the horizontal axis at each wavelength in each field of view, indicating that the vertical axis aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously scattered, indicating that the zoom lens also has good correction for chromatic aberration, ensuring the imaging requirements of the zoom lens to form clear images in the full band.

[0190] Fig.12 for Fig. 9 The field curvature distortion curve of the zoom lens is shown in the figure. In the left coordinate system of the figure, the horizontal coordinate represents the field curvature of the zoom lens, and the unit is mm; the vertical coordinate represents the normalized image height, and there is no unit; T represents the meridian, and S represents the arc loss; Fig.12 It can be seen that the field curvature of the lens provided in this embodiment is effectively controlled, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the size of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Fig.12 It can be seen that the distortion of the lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0191] Fig.14 for Fig.13 The axial aberration curve of the zoom lens shown in the figure shows the normalized aperture in the vertical direction, with 0 being on the optical axis and the vertical vertex representing the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus in millimeters (mm). The different linear curves in the figure represent different wavelengths of system imaging, which are represented by Figure 6 It can be seen that the axial aberrations at different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the spherical aberration of the zoom lens at each wavelength is well controlled and can meet the needs of spectral applications.

[0192] Fig.15 for Fig.13 The ray fan diagram of the zoom lens is shown in Figure 1. Fig.15 As shown. In a single figure, the horizontal axis is the normalized beam aperture, and the vertical axis is the vertical axis aberration. Ideally, each curve should completely coincide with the horizontal axis, and all light rays in the field of view are focused on the same point on the image plane; the vertical axis in a single image can also be expressed as the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. Fig.15 It can be seen that the zoom lens is close to the horizontal axis at each wavelength in each field of view, indicating that the vertical axis aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously scattered, indicating that the zoom lens also has good correction for chromatic aberration, ensuring the imaging requirements of the zoom lens to form clear images in the full band.

[0193] Fig.16 for Fig.13The field curvature distortion curve of the zoom lens is shown in the figure. In the left coordinate system of the figure, the horizontal coordinate represents the field curvature of the zoom lens, and the unit is mm; the vertical coordinate represents the normalized image height, and there is no unit; T represents the meridian, and S represents the arc loss; Fig.16 It can be seen that the field curvature of the lens provided in this embodiment is effectively controlled, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the size of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Fig.16 It can be seen that the distortion of the lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0194] Embodiment 3

[0195] Fig.17 is a schematic diagram of the wide-angle end structure of the zoom lens provided in Embodiment 3 of the present invention; Fig.21 is a schematic diagram of the telephoto end structure of the zoom lens proposed in Embodiment 3 of the present invention; Fig.17 , and combined with Fig.21 The zoom lens comprises: a first fixed lens group G1 with positive focal power, a zoom lens group G2 with negative focal power, an aperture STO, a second fixed lens group G3 with positive focal power, a focus lens group G4 with positive focal power and a flat glass PD are sequentially arranged along the optical axis from the object side to the image side;

[0196] The first fixed lens group G1 includes a first lens 31 with negative optical power, a second lens 32 with positive optical power, and a third lens 33 with positive optical power, wherein the first lens 31 and the second lens 32 are cemented into a doublet lens group; the zoom lens group G2 includes a fourth lens 34 with negative optical power, a fifth lens 35 with negative optical power, and a sixth lens 36 with positive optical power; the second fixed lens group G3 includes a seventh lens 37 with positive optical power, an eighth lens 38 with positive optical power, a ninth lens 39 with negative optical power, a tenth lens 310 with positive optical power, and an eleventh lens 311 with negative optical power, wherein the ninth lens 39, the tenth lens 310, and the eleventh lens 311 are cemented into a triplet lens group; the focusing lens group G4 includes a twelfth lens 312 with positive optical power, a thirteenth lens 313 with negative optical power, a fourteenth lens 314 with positive optical power, and a fifteenth lens 315 with positive optical power.

[0197] Among them, the first lens 31, the second lens 32, the third lens 33, the fourth lens 34, the eighth lens 38, the ninth lens 39, the tenth lens 310, the eleventh lens 311, and the twelfth lens 312 are made of glass, and the fifth lens 35, the sixth lens 36, the seventh lens 37, the thirteenth lens 313, the fourteenth lens 314, and the fifteenth lens 315 are made of plastic.

[0198] Among them, the optical power of the first fixed lens group Optical power of zoom lens group The optical power of the second fixed lens group Refractive power of focusing lens group The following relations are satisfied:

[0199]

[0200] The refractive power of the first lens 31 to the eleventh lens 311 and the refractive power of the zoom lens group Satisfies the following relationship:

[0201]

[0202]

[0203]

[0204] The refractive power of the twelfth to fifteenth lenses 312 to 315 and the refractive power of the focus lens group G4 Satisfies the following relationship:

[0205]

[0206] in, to They respectively represent the optical powers of the first lens 31 to the fifteenth lens 315 .

[0207] Among them, the focal length of the triplet lens group is The focal length of the telephoto end of the zoom lens The relationship between them satisfies:

[0208]

[0209] Among them, the focal length of the zoom lens at the telephoto end The focal length of a zoom lens at the wide angle The relationship between them satisfies:

[0210] The total length TTL of the zoom lens and the moving distance S2 of the zoom lens group satisfy the following relationship:

[0211] TTL / S2=3.284.

[0212] In the present invention, the aspherical lens of the zoom lens satisfies the following formula:

[0213]

[0214] Where Z is the axial distance from the curved surface at a position perpendicular to the optical axis at a height r to the vertex of the surface along the optical axis; c represents the curvature at the vertex of the aspheric surface; a4, a6, a8, a10, a12, a14, a16 are the high-order aspheric coefficients of the corresponding aspheric surface of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order, a i r i The combination becomes the high-order terms corresponding to the aspherical surface.

[0215] In this embodiment, optical physical parameters of the first lens 31 to the fifteenth lens 315 are as follows:

[0216] Table 7 Design values ​​of the zoom lens of Example 3

[0217]

[0218]

[0219] Table 8 Zoom intervals and parameter specifications of the zoom lens at the wide-angle end and the telephoto end of Example 3

[0220]

[0221]

[0222] The surface numbers S1-S30 in Table 7 are numbered according to the surface order of each lens, "STO" represents the aperture of the lens; the radius of curvature represents the degree of curvature of the corresponding lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, wherein "INF" indicates that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and a space represents that the current position is air with a refractive index of 1; Table 8 shows the zoom interval and parameter specifications of a large aperture zoom lens at the wide-angle end and the telephoto end; Table 9 shows the aspheric coefficient values ​​used in the current embodiment.

[0223] Table 9-1 a4-a10 aspheric coefficients of the zoom lens of Example 3

[0224] Surface number a4 a6 a8 a10 S8 4.21120E-05 -9.63086E-07 -3.56307E-09 5.99047E-10 S9 5.95696E-06 -1.47970E-06 -1.45048E-08 6.77446E-10 S10 -1.16346E-05 -1.05677E-06 1.10463E-08 -5.23516E-10 S11 -2.63512E-05 -6.31780E-07 -6.20669E-09 9.66297E-11 S13 -1.93087E-05 7.47373E-08 1.73136E-09 -9.57233E-12 S14 8.36654E-06 2.02249E-07 -1.17179E-09 -3.16889E-12 S23 -1.81935E-04 3.22291E-05 -1.50051E-08 -5.03434E-08 S24 -2.04484E-03 1.28483E-04 -2.90693E-06 -2.02406E-08 S25 -8.11135E-04 3.40739E-05 8.58801E-08 -2.31830E-08 S26 2.13201E-04 -1.92918E-05 4.83360E-07 2.13807E-08 S27 -7.89886E-04 7.07039E-06 -3.09354E-07 3.92457E-08 S28 -9.95689E-05 -3.34729E-05 3.59836E-07 4.50857E-08

[0225] Table 9-2 a12-a16 aspheric coefficients of the zoom lens of Example 3

[0226]

[0227]

[0228] Fig.18 for Fig.17The axial aberration curve of the zoom lens shown in the figure shows the normalized aperture in the vertical direction, with 0 being on the optical axis and the vertical vertex representing the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus in millimeters (mm). The different linear curves in the figure represent different wavelengths of system imaging, which are represented by Fig.18 It can be seen that the axial aberrations at different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the spherical aberration of the zoom lens at each wavelength is well controlled and can meet the needs of spectral applications.

[0229] Fig.19 for Fig.17 The ray fan diagram of the zoom lens is shown in the figure. The ray fan diagram is one of the evaluation methods commonly used by optical designers. Fig.19 As shown. In a single figure, the horizontal axis is the normalized beam aperture, and the vertical axis is the vertical axis aberration. Ideally, each curve should completely coincide with the horizontal axis, and all light rays in the field of view are focused on the same point on the image plane; the vertical axis in a single image can also be expressed as the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. Fig.19 It can be seen that the zoom lens is close to the horizontal axis at each wavelength in each field of view, indicating that the vertical axis aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously scattered, indicating that the zoom lens also has good correction for chromatic aberration, ensuring the imaging requirements of the zoom lens to form clear images in the full band.

[0230] Fig. 20 for Fig.17 The field curvature distortion curve of the zoom lens is shown in the figure. In the left coordinate system of the figure, the horizontal coordinate represents the field curvature of the zoom lens, and the unit is mm; the vertical coordinate represents the normalized image height, and there is no unit; T represents the meridian, and S represents the arc loss; Fig. 20 It can be seen that the field curvature of the lens provided in this embodiment is effectively controlled, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the size of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Fig. 20 It can be seen that the distortion of the lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0231] Fig. 22 for Fig.21 The axial aberration curve of the zoom lens shown in the figure shows the normalized aperture in the vertical direction, with 0 being on the optical axis and the vertical vertex representing the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus in millimeters (mm). The different linear curves in the figure represent different wavelengths of system imaging, which are represented by Fig. 22It can be seen that the axial aberrations at different wavelengths are all controlled within the range of (-0.1mm, +0.1mm), indicating that the spherical aberration of the zoom lens at each wavelength is well controlled and can meet the needs of spectral applications.

[0232] Fig.23 for Fig.21 The ray fan diagram of the zoom lens is shown in Figure 1. Fig.23 As shown. In a single figure, the horizontal axis is the normalized beam aperture, and the vertical axis is the vertical axis aberration. Ideally, each curve should completely coincide with the horizontal axis, and all light rays in the field of view are focused on the same point on the image plane; the vertical axis in a single image can also be expressed as the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. Fig.23 It can be seen that the zoom lens is close to the horizontal axis at each wavelength in each field of view, indicating that the vertical axis aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously scattered, indicating that the zoom lens also has good correction for chromatic aberration, ensuring the imaging requirements of the zoom lens to form clear images in the full band.

[0233] Fig.24 for Fig.21 The field curvature distortion curve of the zoom lens is shown in the figure. In the left coordinate system of the figure, the horizontal coordinate represents the field curvature of the zoom lens, and the unit is mm; the vertical coordinate represents the normalized image height, and there is no unit; T represents the meridian, and S represents the arc loss; Fig.24 It can be seen that the field curvature of the lens provided in this embodiment is effectively controlled, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the size of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Fig.24 It can be seen that the distortion of the lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0234] The present invention adopts a mechanical compensation scheme of two or four moving components, and through the combination of glass-plastic mixed materials, reasonably distributes the optical focal length of each group to positive-negative-positive-positive and the optical focal length of the components within the group, effectively realizing small distortion and high-definition imaging of the lens, and also ensuring that the lens has a relatively compact total length and reasonable cost control; at the same time, a scheme with variable aperture size is adopted to achieve the problem of uniform brightness of the imaging picture during the zoom process; the zoom lens comprehensively takes into account the characteristics of zoom, variable aperture, low distortion and compact structure to meet market demand.

[0235] In summary, according to the zoom lens and shooting device proposed in the embodiments of the present invention, the zoom lens comprises: a first fixed lens group with positive focal power, a zoom lens group with negative focal power, an aperture, a second fixed lens group with positive focal power, a focus lens group with positive focal power, and a flat glass are sequentially arranged along the optical axis from the object side to the image side; the first fixed lens group comprises a first lens with negative focal power, a second lens with positive focal power, and a third lens with positive focal power, wherein the first lens and the second lens are cemented to form a double cemented lens group; the zoom lens group The first lens group includes a fourth lens with negative optical power, a fifth lens with negative optical power, and a sixth lens with positive optical power; the second fixed lens group includes a seventh lens with positive optical power, an eighth lens with positive optical power, a ninth lens with negative optical power, a tenth lens with positive optical power, and an eleventh lens with negative optical power, and the ninth lens, the tenth lens, and the eleventh lens are cemented into a triplet lens group; the focusing lens group includes a twelfth lens with positive optical power, a thirteenth lens with negative optical power, a fourteenth lens with positive optical power, and a fifteenth lens with positive optical power. Thus, through the above design, the zoom lens achieves the effects of zoom, variable aperture, low distortion, and compact structure.

[0236] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A zoom lens, characterized in that: include: Arranged in sequence along the optical axis from the object side to the image side are a first fixed lens group with positive focal power, a zoom lens group with negative focal power, an aperture, a second fixed lens group with positive focal power, a focus lens group with positive focal power, and a flat glass; The first fixed lens group includes a first lens with negative optical power, a second lens with positive optical power, and a third lens with positive optical power, wherein the first lens and the second lens are cemented together to form a doublet lens group; The zoom lens group includes a fourth lens with negative optical power, a fifth lens with negative optical power, and a sixth lens with positive optical power; The second fixed lens group includes a seventh lens with positive optical power, an eighth lens with positive optical power, a ninth lens with negative optical power, a tenth lens with positive optical power and an eleventh lens with negative optical power, and the ninth lens, the tenth lens and the eleventh lens are cemented together to form a triplet lens group; The focusing lens group includes a twelfth lens with positive focal power, a thirteenth lens with negative focal power, a fourteenth lens with positive focal power, and a fifteenth lens with positive focal power; The optical components with optical power in the zoom lens are only the first lens to the fifteenth lens, and the first lens to the fifteenth lens are arranged in sequence from the object side to the image side along the optical axis.

2. The zoom lens according to claim 1, wherein: At least two lenses in the first fixed lens group are made of glass; At least one lens in the zoom lens group is made of glass; At least one lens in the second fixed lens group is an aspherical lens; At least one lens in the focus lens group is made of glass.

3. The zoom lens according to claim 1, wherein: The focal power φG1 of the first fixed lens group, the focal power φG2 of the zoom lens group, the focal power φG3 of the second fixed lens group, and the focal power φG4 of the focus lens group satisfy the following relationship: 0.32≤φG1 / φG4≤0.4; -1.35≤φG2 / φG4≤-0.95; 0.55≤φG3 / φG4≤1.

25.

4. The zoom lens according to claim 1, wherein: The refractive power of the first lens to the eleventh lens and the refractive power φG2 of the zoom lens group satisfy the following relationship: 0.07≤φ1 / φG2≤0.084; -0.25≤φ2 / φG2≤-0.18; -0.2≤φ3 / φG2≤-0.15; 0.8≤φ4 / φG2≤0.88; 0.5≤φ5 / φG2≤0.75; -0.6≤φ6 / φG2≤-0.35; -0.8≤φ7 / φG2≤-0.55; -0.5≤φ8 / φG2≤-0.02; 0.4≤φ9 / φG2≤0.85;-1.5≤φ10 / φG2≤-1.0; 1.25≤φ11 / φG2≤1.85; The refractive power of the twelfth to fifteenth lenses and the refractive power φG4 of the focus lens group satisfy the following relationship: 0.75≤φ12 / φG4≤1.1; -0.95≤φ13 / φG4≤-0.05; -0.25≤φ14 / φG4≤0.85; 0.05≤φ15 / φG4≤0.65; Wherein, φ1 to φ15 represent the optical powers of the first lens to the fifteenth lens respectively.

5. The zoom lens according to claim 1, wherein: The relationship between the focal power φA of the triplet lens group and the focal power φT of the telephoto end of the zoom lens satisfies: -0.95≤φA / φT≤-0.

32.

6. The zoom lens according to claim 1, wherein: The total length TTL of the zoom lens and the moving distance S2 of the zoom lens group satisfy the following relationship: 3.0≤TTL / S2≤4.

0.

7. The zoom lens according to claim 1, wherein: The relationship between the focal power φT at the telephoto end of the zoom lens and the focal power φW at the wide-angle end of the zoom lens satisfies: 0.23≤φT / φW≤0.

28.

8. The zoom lens according to claim 1, wherein: The distance between the zoom lens group and the first fixed lens group varies in a range of 0.57 mm to 21.3 mm; The distance between the zoom lens group and the second fixed lens group varies in the range of 0.57 mm to 21.4 mm; The distance between the focusing lens group and the second fixed lens group varies in a range of 2.3 mm to 3.6 mm; The distance between the focus lens group and the flat glass varies in a range of 2.5 mm to 4.0 mm.

9. The zoom lens according to claim 1, wherein: The refractive index Nd1 of the first lens to the refractive index Nd15 of the fifteenth lens satisfy the following relationship: 1.75≤Nd1≤2.0; 1.4≤Nd2≤1.45; 1.4≤Nd3≤1.55; 1.8≤Nd4≤2.0; 1.5≤Nd5≤1.75; 1.6≤Nd6≤2.0; 1.5≤Nd7≤1.65; 1.55≤Nd8≤1.65; 1.6≤Nd9≤1.8; 1.5≤Nd10≤1.7; 1.6≤Nd11≤1.7; 1.55≤Nd12≤1.8; 1.6≤Nd13≤1.7; 1.5≤Nd14≤1.6; 1.5≤Nd15≤1.

7.

10. The zoom lens according to claim 1, wherein: The aperture size of the aperture varies in the range of 6.3 mm to 7.4 mm, and the aperture position is fixed.

11. A photographing device, characterized in that: Comprising the zoom lens as described in any one of claims 1-10.

Images