Zoom lens and imaging device

Abstract

The present application relates to the field of optics, specifically to a zoom lens and an imaging device. The zoom lens comprises, from the object side to the image side, a first fixed lens group with positive focal power, a variable magnification lens group with negative focal power, a diaphragm, a second fixed lens group with positive focal power, a focusing lens group with negative focal power, and an auxiliary lens group with positive focal power. The zoom lens satisfies the following conditions: ft / fw>10; TTL<130mm; wherein ft is the focal length of the zoom lens in a telephoto state, fw is the focal length of the zoom lens in a wide-angle state, and TTL is the total optical length of the zoom lens. The zoom lens with a medium magnification is achieved, and the total optical length of the zoom lens is limited, thereby achieving a small size of the zoom lens, which facilitates the use of the zoom lens.

Description

Technical Field

[0001] This invention relates to the field of optics, specifically to a zoom lens and an imaging device. Background Technology

[0002] A zoom lens is a lens that can change its focal length within a certain range to obtain different widths of field of view, different sizes of images, and different ranges of objects. A zoom lens can change the shooting range by changing the focal length without changing the shooting distance, which is very beneficial for image composition.

[0003] With the increasing popularity of zoom lenses, they are playing an important role in more and more fields such as surveillance and video conferencing. Due to their larger focal length and magnification, medium-magnification zoom lenses require a larger moving distance of the moving groups within the zoom lens, resulting in a larger size and making them less convenient to use. Summary of the Invention

[0004] This invention will solve the existing technical problems and provide a zoom lens and imaging device, realizing a medium-magnification zoom lens. At the same time, by limiting the total optical length of the zoom lens, a small size of the zoom lens is achieved, which facilitates the use of the zoom lens.

[0005] The technical solution provided by this invention is as follows:

[0006] A zoom lens, wherein the zoom lens comprises, from the object plane side to the image plane side, a first fixed lens group with positive optical power, a zoom lens group with negative optical power, an aperture, a second fixed lens group with positive optical power, a focusing lens group with negative optical power, and an auxiliary lens group with positive optical power.

[0007] The zoom lens satisfies the following condition:

[0008] ft / fw > 10;

[0009] TTL < 130mm;

[0010] Wherein, ft is the focal length of the zoom lens in telephoto mode, fw is the focal length of the zoom lens in wide-angle mode, and TTL is the total optical length of the zoom lens.

[0011] In this technical solution, a medium-magnification zoom lens is achieved by setting the above structure and parameters. At the same time, by limiting the total optical length of the zoom lens, a small size of the zoom lens is achieved, which facilitates the use of the zoom lens.

[0012] Preferably, the first fixed lens group includes, from the object plane side to the image plane side, a first fixed lens group with positive optical power, a second fixed lens with positive optical power, and a third fixed lens with positive optical power, wherein the first fixed lens group is formed by bonding a first fixed lens with negative optical power and a second fixed lens with positive optical power.

[0013] Preferably, the zoom lens group consists of a first zoom lens with negative optical power, a second zoom lens group with negative optical power, and a third zoom lens with negative optical power, from the object plane side to the image plane side. The second zoom lens group is formed by cementing a first zoom lens with negative optical power and a second zoom lens with positive optical power together.

[0014] Preferably, the second fixed lens group consists of a fourth fixed lens with positive optical power, a fifth fixed lens with positive optical power, a sixth fixed lens group with positive optical power, and a seventh fixed lens with positive optical power, from the object plane side to the image plane side. The sixth fixed lens group is formed by bonding a third fixed lens with negative optical power, a fourth fixed lens with positive optical power, and a fifth fixed lens with negative optical power.

[0015] Preferably, the second fixed lens group consists of a fourth fixed lens with positive optical power, a fifth fixed lens group with positive optical power, and a sixth fixed lens group with positive optical power, sequentially from the object plane side to the image plane side. The fifth fixed lens group is formed by cementing together a third fixed lens with positive optical power, a fourth fixed lens with negative optical power, and a fifth fixed lens with positive optical power. The sixth fixed lens group is a single lens with positive optical power, or it is formed by cementing together a sixth fixed lens with negative optical power and a seventh fixed lens with positive optical power.

[0016] Preferably, the focusing lens group is a negative optical power focusing lens group, which is formed by bonding a first focusing lens with positive optical power and a second focusing lens with negative optical power.

[0017] and / or

[0018] The auxiliary lens group is a single auxiliary lens with positive optical power.

[0019] Preferably, the zoom lens includes at least one aspherical lens.

[0020] In this technical solution, the spherical aberration of the zoom lens can be corrected by setting an aspherical surface, thereby improving the image quality of the zoom lens.

[0021] Preferably, the lens closest to the image plane in the auxiliary lens group is an aspherical lens;

[0022] and / or

[0023] The lens closest to the object surface in the second fixed lens group is an aspherical lens.

[0024] In this technical solution, by setting the aspherical lens closest to the image plane in the auxiliary lens group, the possibility of aberration and coma in the zoom lens is reduced, and the imaging quality of the zoom lens is increased; by setting the aspherical lens closest to the object plane in the second fixed lens group, chromatic aberration and aberration at the wide-angle end and telephoto end of the zoom lens are reduced, and the imaging quality of the zoom lens is increased.

[0025] Preferably, the zoom lens satisfies the following condition:

[0026] SG4 / SG2 > 0.1;

[0027] Wherein, SG2 is the moving distance of the zoom lens group, and SG4 is the moving distance of the focusing lens group.

[0028] In this technical solution, by limiting the moving distance of the zoom lens group and the focusing lens group, the moving distance of the zoom lens group is increased, thereby achieving a larger zoom range for the zoom lens.

[0029] Preferably, the zoom lens satisfies the following condition:

[0030] SG5 / SG2 > 0.1;

[0031] Wherein, SG5 is the moving distance of the auxiliary lens group.

[0032] In this technical solution, the imaging quality of the zoom lens is further improved by setting up an auxiliary lens group. At the same time, by reducing the moving distance of the auxiliary lens group, the size of the zoom lens is reduced, thus achieving miniaturization of the zoom lens.

[0033] Preferably, the zoom lens satisfies the following condition:

[0034] fAi / fw > 5;

[0035] Where i = 1, 2, 3, fA1 is the focal length of the first fixed lens group, and fA2 and fA3 are the focal lengths of the second fixed lens and the third fixed lens, respectively.

[0036] In this technical solution, by limiting the focal length of each lens in the first fixed lens group, the chromatic aberration and aberration at the wide-angle end of the zoom lens are corrected, thereby increasing the reliability of the zoom lens imaging.

[0037] Preferably, the third fixed lens satisfies the following condition:

[0038] a3e / a3c > 0.6;

[0039] |(Ra31+Ra32) / (Ra31-Ra32)|>3;

[0040] Where a3e is the thickness at the edge of the third fixed lens, a3c is the thickness at the center of the third fixed lens, Ra31 is the radius of curvature of the object side surface of the third fixed lens, and Ra32 is the radius of curvature of the image side surface of the third fixed lens.

[0041] In this technical solution, by limiting the above parameters, a thicker third fixed lens is achieved, thereby reducing the number of lenses used in the zoom lens and lowering the cost of the zoom lens.

[0042] Preferably, the zoom lens satisfies the following condition:

[0043] fnow < 1.6;

[0044] fnot > 5;

[0045] Where fnow is the aperture number of the zoom lens in wide-angle mode, and fnot is the aperture number of the zoom lens in telephoto mode.

[0046] In this technical solution, by limiting the aperture number, the zoom lens can be applied to different scenarios, thus increasing the applicability of the zoom lens.

[0047] One of the objectives of this invention is to provide an imaging device, comprising: a zoom lens; and an imaging element configured to receive an image formed by the zoom lens.

[0048] Compared with the prior art, the zoom lens and imaging device provided by the present invention have the following beneficial effects:

[0049] 1. By setting the above structure and parameters, a medium-magnification zoom lens is realized. At the same time, by limiting the total optical length of the zoom lens, a small size of the zoom lens is achieved, which facilitates the use of the zoom lens.

[0050] 2. By using aspherical lenses closest to the image plane in the auxiliary lens group, the possibility of aberrations and coma in the zoom lens is reduced, thus increasing the image quality of the zoom lens; by using aspherical lenses closest to the object plane in the second fixed lens group, chromatic aberration and aberrations at the wide-angle and telephoto ends of the zoom lens are reduced, thus increasing the image quality of the zoom lens.

[0051] 3. By limiting the moving distance of the zoom lens group and the focusing lens group, the moving distance of the zoom lens group is increased, thus achieving a larger zoom range for the zoom lens.

[0052] 4. By setting up an auxiliary lens group, the image quality of the zoom lens is further improved. At the same time, by reducing the moving distance of the auxiliary lens group, the size of the zoom lens is reduced, thus achieving miniaturization of the zoom lens. Attached Figure Description

[0053] The preferred embodiments will now be described in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of a zoom lens and imaging device.

[0054] Figure 1 This is a schematic diagram of the structure of a zoom lens according to the present invention;

[0055] Figure 2 This is an aberration diagram of a zoom lens in telephoto mode according to the present invention;

[0056] Figure 3 This is an aberration diagram of a zoom lens in a wide-angle state according to the present invention;

[0057] Figure 4 This is a schematic diagram of another zoom lens according to the present invention;

[0058] Figure 5 This is another aberration diagram of the zoom lens in telephoto mode according to the present invention;

[0059] Figure 6 This is another aberration diagram of the zoom lens in the wide-angle state according to the present invention;

[0060] Figure 7 This is a schematic diagram of the structure of another zoom lens of the present invention;

[0061] Figure 8 This is another aberration diagram of the zoom lens in telephoto mode according to the present invention;

[0062] Figure 9 This is another aberration diagram of a zoom lens in a wide-angle state according to the present invention.

[0063] The reference numerals in the attached diagrams are as follows: G1, First fixed lens group; G2, Zoom lens group; G3, Second fixed lens group; G4, Focusing lens group; G5, Auxiliary lens group; G6, Auxiliary component; A1, First fixed lens group; A2, Second fixed lens; A3, Third fixed lens; A4, Fourth fixed lens; A5, Fifth fixed lens; A6, Sixth fixed lens group; A7, Seventh fixed lens; B1, First zoom lens; B2, Second zoom lens group; B3, Third zoom lens; C1, Focusing lens group; B4, Auxiliary lens; CG, Protective glass; a1, First fixed lens; a2, Second fixed lens; a3, Third fixed lens; a4, Fourth fixed lens; a5, Fifth fixed lens; a6, Sixth fixed lens; a7, Seventh fixed lens; b1, First zoom lens; b2, Second zoom lens; c1, First focusing lens; c2, Second focusing lens. Detailed Implementation

[0064] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0065] To keep the drawings concise, each figure only schematically shows the parts relevant to the invention, and these do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0066] Example 1

[0067] A zoom lens, comprising, from the object plane side to the image plane side, the following components:

[0068] The first fixed lens group G1 with positive optical power, the zoom lens group G2 with negative optical power, the aperture stop, the second fixed lens group G3 with positive optical power, the focusing lens group G4 with negative optical power, and the auxiliary lens group G5 with positive optical power.

[0069] The zoom lens satisfies the following condition:

[0070] ft / fw > 10;

[0071] TTL < 130mm;

[0072] Wherein, ft is the focal length of the zoom lens in telephoto mode, fw is the focal length of the zoom lens in wide-angle mode, and TTL is the total optical length of the zoom lens.

[0073] In this embodiment, a medium-magnification zoom lens is achieved by setting the above structure and parameters. At the same time, by limiting the total optical length of the zoom lens, a small size of the zoom lens is achieved, which facilitates the use of the zoom lens.

[0074] The first fixed lens group G1 includes, from the object plane side to the image plane side, a first fixed lens group A1 with positive optical power, a second fixed lens A2 with positive optical power, and a third fixed lens A3 with positive optical power. The first fixed lens group A1 is formed by bonding a first fixed lens a1 with negative optical power and a second fixed lens a2 with positive optical power.

[0075] The zoom lens group G2 includes, from the object plane side to the image plane side, a first zoom lens B1 with negative optical power, a second zoom lens group B2 with negative optical power, and a third zoom lens B3 with negative optical power. The second zoom lens group B2 is formed by bonding the first zoom lens b1 with negative optical power and the second zoom lens b2 with positive optical power.

[0076] The second fixed lens group G3 includes, from the object plane side to the image plane side, a fourth fixed lens A4 with positive optical power, a fifth fixed lens A5 with positive optical power, a sixth fixed lens group A6 with positive optical power, and a seventh fixed lens A7 with positive optical power. The sixth fixed lens group A6 is formed by bonding a third fixed lens a3 with negative optical power, a fourth fixed lens a4 with positive optical power, and a fifth fixed lens a5 with negative optical power.

[0077] Alternatively, the second fixed lens group G3 may include, from the object plane side to the image plane side, a fourth fixed lens A4 of positive optical power, a fifth fixed lens group A5 of positive optical power, and a sixth fixed lens group A6 of positive optical power. The fifth fixed lens group A5 is formed by cementing together a third fixed lens a3 of positive optical power, a fourth fixed lens a4 of negative optical power, and a fifth fixed lens a5 of positive optical power. The sixth fixed lens group A6 is a lens of positive optical power, or it may be formed by cementing together a sixth fixed lens a6 of negative optical power and a seventh fixed lens a7 of positive optical power.

[0078] The focusing lens group G4 is a negative optical power focusing lens group C1, which is formed by bonding a first focusing lens c1 with positive optical power and a second focusing lens c2 with negative optical power.

[0079] and / or

[0080] The auxiliary lens group G5 is an auxiliary lens B4 with positive optical power.

[0081] The zoom lens includes at least one aspherical lens.

[0082] In this embodiment, by setting an aspherical surface, the spherical aberration of the zoom lens can be corrected, thereby improving the image quality of the zoom lens.

[0083] The lens closest to the image plane in the auxiliary lens group G5 is an aspherical lens;

[0084] and / or

[0085] The lens closest to the object surface in the second fixed lens group G3 is an aspherical lens.

[0086] In this embodiment, by setting the aspherical lens closest to the image plane in the auxiliary lens group G5, the possibility of aberrations and coma in the zoom lens is reduced, and the imaging quality of the zoom lens is increased. By setting the aspherical lens closest to the object plane in the second fixed lens group G3, chromatic aberration and aberration at the wide-angle end and telephoto end of the zoom lens are reduced, and the imaging quality of the zoom lens is increased.

[0087] The zoom lens satisfies the following condition:

[0088] SG4 / SG2 > 0.1;

[0089] Wherein, SG2 is the moving distance of the zoom lens group G2, and SG4 is the moving distance of the focusing lens group G4.

[0090] In this embodiment, by limiting the moving distance of the zoom lens group G2 and the focusing lens group G4, the moving distance of the zoom lens group is increased, thereby achieving a larger zoom range for the zoom lens.

[0091] The zoom lens satisfies the following condition:

[0092] SG5 / SG2 > 0.1;

[0093] Wherein, SG5 is the moving distance of the auxiliary lens group G5.

[0094] In this embodiment, the imaging quality of the zoom lens is further improved by setting the auxiliary lens group G5. At the same time, by reducing the moving distance of the auxiliary lens group G5, the size of the zoom lens is reduced, thus achieving miniaturization of the zoom lens.

[0095] The zoom lens satisfies the following condition:

[0096] fAi / fw > 5;

[0097] Where i = 1, 2, 3, fA1 is the focal length of the first fixed lens group A1, and fA2 and fA3 are the focal lengths of the second fixed lens A2 and the third fixed lens A3, respectively.

[0098] In this embodiment, by limiting the focal length of each lens in the first fixed lens group G1, the chromatic aberration and aberration at the wide-angle end of the zoom lens are corrected, thereby increasing the reliability of the zoom lens imaging.

[0099] The third fixed lens A3 satisfies the following condition:

[0100] a3e / a3c > 0.6;

[0101] |(Ra31+Ra32) / (Ra31-Ra32)|>3;

[0102] Where a3e is the thickness at the edge of the third fixed lens A3, a3c is the thickness at the center of the third fixed lens A3, Ra31 is the radius of curvature of the object side surface of the third fixed lens A3, and Ra32 is the radius of curvature of the image side surface of the third fixed lens A3.

[0103] In this embodiment, by limiting the above parameters, a thicker third fixed lens A3 is set, thereby reducing the number of lenses used in the zoom lens and reducing the cost of the zoom lens.

[0104] The zoom lens satisfies the following condition:

[0105] fnow < 1.6;

[0106] fnot > 5;

[0107] Where fnow is the aperture number of the zoom lens in wide-angle mode, and fnot is the aperture number of the zoom lens in telephoto mode.

[0108] In this embodiment, by limiting the aperture number, the zoom lens can be applied to different scenarios, thus increasing the applicability of the zoom lens.

[0109] Example 2

[0110] A zoom lens, comprising, from the object plane side to the image plane side, the following components:

[0111] The first fixed lens group G1 with positive optical power, the zoom lens group G2 with negative optical power, the aperture stop, the second fixed lens group G3 with positive optical power, the focusing lens group G4 with negative optical power, the auxiliary lens group G5 with positive optical power, and the auxiliary component G6.

[0112] The first fixed lens group G1 includes, from the object plane side to the image plane side, a first fixed lens group A1 with positive optical power, a second fixed lens A2 with positive optical power, and a third fixed lens A3 with positive optical power. The first fixed lens group A1 is formed by bonding a first fixed lens a1 with negative optical power and a second fixed lens a2 with positive optical power.

[0113] The zoom lens group G2 includes, from the object plane side to the image plane side, a first zoom lens B1 with negative optical power, a second zoom lens group B2 with negative optical power, and a third zoom lens B3 with negative optical power. The second zoom lens group B2 is formed by bonding the first zoom lens b1 with negative optical power and the second zoom lens b2 with positive optical power.

[0114] The second fixed lens group G3 includes, from the object plane side to the image plane side, a fourth fixed lens A4 with positive optical power, a fifth fixed lens A5 with positive optical power, a sixth fixed lens group A6 with positive optical power, and a seventh fixed lens A7 with positive optical power. The sixth fixed lens group A6 is formed by bonding a third fixed lens a3 with negative optical power, a fourth fixed lens a4 with positive optical power, and a fifth fixed lens a5 with negative optical power.

[0115] The focusing lens group G4 is a negative optical power focusing lens group C1, which is formed by bonding a first focusing lens c1 with positive optical power and a second focusing lens c2 with negative optical power.

[0116] The auxiliary lens group G5 is an auxiliary lens B4 with positive optical power.

[0117] The auxiliary component G6 is the protective glass CG.

[0118] The basic lens data of the zoom lens in this embodiment is shown in Table 1, the variable parameters in Table 1 are shown in Table 2, and the aspherical coefficients are shown in Table 3.

[0119] The surface number column shows the surface number when the object-side surface is set as surface 1 and the numbering is increased sequentially towards the image side; the surface type column shows the surface type of a lens; the radius of curvature column shows the radius of curvature of a lens, where a positive radius of curvature indicates that the surface is curved towards the object side and a negative radius of curvature indicates that the surface is curved towards the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to it on the image side; the refractive index column shows the refractive index of a lens; and the Abbe number column shows the Abbe number of a lens.

[0120] In Table 2, the WIDE column indicates the specific values ​​of each variable parameter when the zoom lens is in wide-angle mode, and the TELE column indicates the specific values ​​of each variable parameter when the zoom lens is in telephoto mode.

[0121] In Table 3, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0122] Table 1

[0123]

[0124]

[0125] Table 2

[0126] WIDE TELE D1 4.82 35.64 D2 32.17 1.35 D3 6.21 1.00 D4 7.86 17.70 D5 6.33 1.70

[0127] Table 3

[0128]

[0129] In this embodiment, fw = 18mm, ft = 200.33mm, ft / fw = 11.13, TTL = 128mm, fnow = 1.5, fnot = 5.06;

[0130] Wherein, ft is the focal length of the zoom lens in telephoto mode, fw is the focal length of the zoom lens in wide-angle mode, TTL is the total optical length of the zoom lens, fnow is the aperture number of the zoom lens in wide-angle mode, and fnot is the aperture number of the zoom lens in telephoto mode.

[0131] SG2=30.82mm, SG4=5.21mm, SG4 / SG2=0.169;

[0132] SG5=4.63mm, SG4 / SG2=0.15;

[0133] Wherein, SG2 is the moving distance of the zoom lens group G2, SG4 is the moving distance of the focusing lens group G4, and SG5 is the moving distance of the auxiliary lens group G5.

[0134] fA1=557.79mm, fA2=112.5mm, fA3=219.02mm;

[0135] fA1 / fw=30.99, fA2 / fw=6.25, fA3 / fw=12.17;

[0136] Wherein, fA1 is the focal length of the first fixed lens group A1, and fA2 and fA3 are the focal lengths of the second fixed lens A2 and the third fixed lens A3, respectively.

[0137] a3e=7.18mm, a3c=4.76mm, a3e / a3c=0.663;

[0138] Ra31=51.58mm, Ra32=95.25mm;

[0139] |(Ra31+Ra32) / (Ra31-Ra32)|=3.36;

[0140] Where a3e is the thickness at the edge of the third fixed lens A3, a3c is the thickness at the center of the third fixed lens A3, Ra31 is the radius of curvature of the object side surface of the third fixed lens A3, and Ra32 is the radius of curvature of the image side surface of the third fixed lens A3.

[0141] Example 3

[0142] A zoom lens, comprising, from the object plane side to the image plane side, the following components:

[0143] The first fixed lens group G1 with positive optical power, the zoom lens group G2 with negative optical power, the aperture stop, the second fixed lens group G3 with positive optical power, the focusing lens group G4 with negative optical power, the auxiliary lens group G5 with positive optical power, and the auxiliary component G6.

[0144] The first fixed lens group G1 includes, from the object plane side to the image plane side, a first fixed lens group A1 with positive optical power, a second fixed lens A2 with positive optical power, and a third fixed lens A3 with positive optical power. The first fixed lens group A1 is formed by bonding a first fixed lens a1 with negative optical power and a second fixed lens a2 with positive optical power.

[0145] The zoom lens group G2 includes, from the object plane side to the image plane side, a first zoom lens B1 with negative optical power, a second zoom lens group B2 with negative optical power, and a third zoom lens B3 with negative optical power. The second zoom lens group B2 is formed by bonding the first zoom lens b1 with negative optical power and the second zoom lens b2 with positive optical power.

[0146] The second fixed lens group G3 includes, from the object plane side to the image plane side, a fourth fixed lens A4 with positive optical power, a fifth fixed lens group A5 with positive optical power, and a sixth fixed lens group A6 with positive optical power. The fifth fixed lens group A5 is formed by bonding a third fixed lens a3 with positive optical power, a fourth fixed lens a4 with negative optical power, and a fifth fixed lens a5 with positive optical power. The sixth fixed lens group A6 is a single lens with positive optical power.

[0147] The focusing lens group G4 is a negative optical power focusing lens group C1, which is formed by bonding a first focusing lens c1 with positive optical power and a second focusing lens c2 with negative optical power.

[0148] The auxiliary lens group G5 is an auxiliary lens B4 with positive optical power.

[0149] The auxiliary component G6 is the protective glass CG.

[0150] The basic lens data of the zoom lens in this embodiment is shown in Table 4, the variable parameters in Table 4 are shown in Table 5, and the aspherical coefficients are shown in Table 6.

[0151] The surface number column shows the surface number when the object-side surface is set as surface 1 and the numbering is increased sequentially towards the image side; the surface type column shows the surface type of a lens; the radius of curvature column shows the radius of curvature of a lens, where a positive radius of curvature indicates that the surface is curved towards the object side and a negative radius of curvature indicates that the surface is curved towards the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to it on the image side; the refractive index column shows the refractive index of a lens; and the Abbe number column shows the Abbe number of a lens.

[0152] In Table 5, the WIDE column indicates the specific values ​​of each variable parameter when the zoom lens is in the wide-angle position, and the TELE column indicates the specific values ​​of each variable parameter when the zoom lens is in the telephoto position.

[0153] In Table 6, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0154] Table 4

[0155]

[0156]

[0157] Table 5

[0158] WIDE TELE D1 5.81 35.55 D2 30.03 0.29 D3 5.38 0.90 D4 7.71 18.90 D5 7.92 1.20

[0159] Table 6

[0160]

[0161] In this embodiment, fw = 17mm, ft = 200.09mm, ft / fw = 11.77, TTL = 124mm, fnow = 1.5, fnot = 5;

[0162] Wherein, ft is the focal length of the zoom lens in telephoto mode, fw is the focal length of the zoom lens in wide-angle mode, TTL is the total optical length of the zoom lens, fnow is the aperture number of the zoom lens in wide-angle mode, and fnot is the aperture number of the zoom lens in telephoto mode.

[0163] SG2=29.74mm, SG4=4.48mm, SG4 / SG2=0.151;

[0164] SG5=6.72mm, SG4 / SG2=0.226;

[0165] Wherein, SG2 is the moving distance of the zoom lens group G2, SG4 is the moving distance of the focusing lens group G4, and SG5 is the moving distance of the auxiliary lens group G5.

[0166] fA1=592.55mm, fA2=115.96mm, fA3=219.84mm;

[0167] fA1 / fw=34.9, fA2 / fw=6.82, fA3 / fw=12.9;

[0168] Wherein, fA1 is the focal length of the first fixed lens group A1, and fA2 and fA3 are the focal lengths of the second fixed lens A2 and the third fixed lens A3, respectively.

[0169] a3e=7.71mm, a3c=5.02mm, a3e / a3c=0.651;

[0170] Ra31=48mm, Ra32=81.03mm;

[0171] |(Ra31+Ra32) / (Ra31-Ra32)|=3.91;

[0172] Where a3e is the thickness at the edge of the third fixed lens A3, a3c is the thickness at the center of the third fixed lens A3, Ra31 is the radius of curvature of the object side surface of the third fixed lens A3, and Ra32 is the radius of curvature of the image side surface of the third fixed lens A3.

[0173] Example 4

[0174] A zoom lens, comprising, from the object plane side to the image plane side, the following components:

[0175] The first fixed lens group G1 with positive optical power, the zoom lens group G2 with negative optical power, the aperture stop, the second fixed lens group G3 with positive optical power, the focusing lens group G4 with negative optical power, the auxiliary lens group G5 with positive optical power, and the auxiliary component G6.

[0176] The first fixed lens group G1 includes, from the object plane side to the image plane side, a first fixed lens group A1 with positive optical power, a second fixed lens A2 with positive optical power, and a third fixed lens A3 with positive optical power. The first lens group is formed by bonding a first fixed lens a1 with negative optical power and a second fixed lens a2 with positive optical power.

[0177] The zoom lens group G2 includes, from the object plane side to the image plane side, a first zoom lens B1 with negative optical power, a second zoom lens group B2 with negative optical power, and a third zoom lens B3 with negative optical power. The second zoom lens group B2 is formed by bonding the first zoom lens b1 with negative optical power and the second zoom lens b2 with positive optical power.

[0178] The second fixed lens group G3 includes, from the object plane side to the image plane side, a fourth fixed lens A4 with positive optical power, a fifth fixed lens group A5 with positive optical power, and a sixth fixed lens group A6 with positive optical power. The fifth fixed lens group A5 is formed by cementing together a third fixed lens a3 with positive optical power, a fourth fixed lens a4 with negative optical power, and a fifth fixed lens a5 with positive optical power. The sixth fixed lens group A6 is formed by cementing together a sixth fixed lens a6 with negative optical power and a seventh fixed lens a7 with positive optical power.

[0179] The focusing lens group G4 is a negative optical power focusing lens group C1, which is formed by bonding a first focusing lens c1 with positive optical power and a second focusing lens c2 with negative optical power.

[0180] The auxiliary lens group G5 is an auxiliary lens B4 with positive optical power.

[0181] The auxiliary component G6 is the protective glass CG.

[0182] The basic lens data of the zoom lens in this embodiment is shown in Table 7, the variable parameters in Table 7 are shown in Table 8, and the aspherical coefficients are shown in Table 9.

[0183] The surface number column shows the surface number when the object-side surface is set as surface 1 and the numbering is increased sequentially towards the image side; the surface type column shows the surface type of a lens; the radius of curvature column shows the radius of curvature of a lens, where a positive radius of curvature indicates that the surface is curved towards the object side and a negative radius of curvature indicates that the surface is curved towards the image side; the center thickness column shows the surface spacing on the optical axis between each surface and the surface adjacent to it on the image side; the refractive index column shows the refractive index of a lens; and the Abbe number column shows the Abbe number of a lens.

[0184] In Table 8, the WIDE column indicates the specific values ​​of each variable parameter when the zoom lens is in the wide-angle position, and the TELE column indicates the specific values ​​of each variable parameter when the zoom lens is in the telephoto position.

[0185] In Table 9, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0186] Table 7

[0187]

[0188]

[0189] Table 8

[0190] WIDE TELE D1 5.7 35.63 D2 30.14 0.23 D3 4.54 0.90 D4 8.08 17.41 D5 6.89 1.20

[0191] Table 9

[0192]

[0193] In this embodiment, fw = 17mm, ft = 200.09mm, ft / fw = 11.77, TTL = 124mm, fnow = 1.5, fnot = 5;

[0194] Wherein, ft is the focal length of the zoom lens in telephoto mode, fw is the focal length of the zoom lens in wide-angle mode, TTL is the total optical length of the zoom lens, fnow is the aperture number of the zoom lens in wide-angle mode, and fnot is the aperture number of the zoom lens in telephoto mode.

[0195] SG2=29.91mm, SG4=3.64mm, SG4 / SG2=0.122;

[0196] SG5=5.69mm, SG4 / SG2=0.19;

[0197] Wherein, SG2 is the moving distance of the zoom lens group G2, SG4 is the moving distance of the focusing lens group G4, and SG5 is the moving distance of the auxiliary lens group G5.

[0198] fA1=505.57mm, fA2=115.54mm, fA3=220.17mm;

[0199] fA1 / fw=29.73, fA2 / fw=6.8, fA3 / fw=12.95;

[0200] Wherein, fA1 is the focal length of the first fixed lens group A1, and fA2 and fA3 are the focal lengths of the second fixed lens A2 and the third fixed lens A3, respectively.

[0201] a3e=7.71mm, a3c=5.02mm, a3e / a3c=0.651;

[0202] Ra31=48mm, Ra32=81.03mm;

[0203] |(Ra31+Ra32) / (Ra31-Ra32)|=3.91;

[0204] Where a3e is the thickness at the edge of the third fixed lens A3, a3c is the thickness at the center of the third fixed lens A3, Ra31 is the radius of curvature of the object side surface of the third fixed lens A3, and Ra32 is the radius of curvature of the image side surface of the third fixed lens A3.

[0205] Example 5

[0206] An imaging device, such as Figures 1-9 As shown, it includes: a zoom lens as described in any of the above embodiments, and an imaging element configured to receive an image formed by the zoom lens.

[0207] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A zoom lens, characterized in that, The zoom lens consists of, from the object plane side to the image plane side, a first fixed lens group with positive optical power, a zoom lens group with negative optical power, an aperture stop, a second fixed lens group with positive optical power, a focusing lens group with negative optical power, and an auxiliary lens group with positive optical power. The first fixed lens group consists of a first fixed lens group with positive optical power, a second fixed lens with positive optical power, and a third fixed lens with positive optical power, from the object plane side to the image plane side. The first fixed lens group is formed by bonding a first fixed lens with negative optical power and a second fixed lens with positive optical power. The zoom lens group consists of a first zoom lens with negative optical power, a second zoom lens group with negative optical power, and a third zoom lens with negative optical power, from the object plane side to the image plane side. The second zoom lens group is formed by cementing a first zoom lens with negative optical power and a second zoom lens with positive optical power together. The second fixed lens group consists of a fourth fixed lens with positive optical power, a fifth fixed lens with positive optical power, a sixth fixed lens group with positive optical power, and a seventh fixed lens with positive optical power, from the object plane side to the image plane side. The sixth fixed lens group is formed by bonding a third fixed lens with negative optical power, a fourth fixed lens with positive optical power, and a fifth fixed lens with negative optical power. or The second fixed lens group consists of a fourth fixed lens with positive optical power, a fifth fixed lens group with positive optical power, and a sixth fixed lens group with positive optical power, sequentially from the object plane side to the image plane side. The fifth fixed lens group is formed by cementing together a third fixed lens with positive optical power, a fourth fixed lens with negative optical power, and a fifth fixed lens with positive optical power. The sixth fixed lens group is a single lens with positive optical power, or it is formed by cementing together a sixth fixed lens with negative optical power and a seventh fixed lens with positive optical power. The focusing lens group is a negative optical power focusing lens group, which is formed by bonding a first focusing lens with positive optical power and a second focusing lens with negative optical power. and / or The auxiliary lens group is a single auxiliary lens with positive optical power; The zoom lens satisfies the following condition: ft / fw > 10; TTL < 130mm; 0.122≤SG4 / SG2≤0.169; 0.15≤SG5 / SG2≤0.226; Wherein, ft is the focal length of the zoom lens in telephoto mode, fw is the focal length of the zoom lens in wide-angle mode, TTL is the total optical length of the zoom lens, SG2 is the moving distance of the zoom lens group, SG4 is the moving distance of the focusing lens group, and SG5 is the moving distance of the auxiliary lens group.

2. A zoom lens according to claim 1, characterized in that: The zoom lens includes at least one aspherical lens.

3. A zoom lens according to claim 1 or 2, characterized in that: The lens closest to the image plane in the auxiliary lens group is an aspherical lens; and / or The lens closest to the object surface in the second fixed lens group is an aspherical lens.

4. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: fAi / fw > 5; Where i = 1, 2, 3, fA1 is the focal length of the first fixed lens group, and fA2 and fA3 are the focal lengths of the second fixed lens and the third fixed lens, respectively.

5. A zoom lens according to claim 1, characterized in that: The third fixed lens satisfies the following condition: a3c / a3e > 0.6; |(Ra31+Ra32) / (Ra31-Ra32)|>3; Where a3e is the thickness at the edge of the third fixed lens, a3c is the thickness at the center of the third fixed lens, Ra31 is the radius of curvature of the object side surface of the third fixed lens, and Ra32 is the radius of curvature of the image side surface of the third fixed lens.

6. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: fnow < 1.6; fnot > 5; Where fnow is the aperture number of the zoom lens in wide-angle mode, and fnot is the aperture number of the zoom lens in telephoto mode.

7. An imaging device, characterized in that, include: The zoom lens as described in any one of claims 1 to 6; And an imaging element, configured to receive an image formed by the zoom lens.

Images