Dual optical zoom lens and imaging device

Abstract

The application relates to the optical field, in particular to a dual-optical zoom lens and an imaging device. The dual-optical zoom lens is composed of a fixed lens group with positive focal length, a first variable magnification lens group with negative focal length, a second variable magnification lens group with positive focal length, a focusing lens group with negative focal length, an adjusting lens group with positive focal length and a light splitting prism from the object plane side to the image plane side. The aberration and coma of the zoom lens are greatly reduced, the dual-optical zoom lens can realize a large magnification on the basis of miniaturization, and the application range of the dual-optical zoom lens is increased.

Description

Technical Field

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

[0002] Existing dual-light lenses use a prism to split the light path into visible and infrared paths, and use two sensors to receive the two types of light to generate two images, which are then fused together. Due to the use of a beam splitter prism, the rear array of the lens increases dramatically, making it difficult to miniaturize high- and medium-magnification zoom lenses. Summary of the Invention

[0003] This invention will solve the existing technical problems and provide a dual-light zoom lens that greatly reduces the aberrations and coma of zoom lenses. It enables dual-light zoom lenses to achieve a large magnification while being miniaturized, thus increasing the applicability of dual-light zoom lenses.

[0004] The technical solution provided by this invention is as follows:

[0005] A dual-light zoom lens, wherein the dual-light zoom lens comprises, from the object plane side to the image plane side, a fixed lens group with positive optical power, a first zoom lens group with negative optical power, a second zoom lens group with positive optical power, a focusing lens group with negative optical power, an adjusting lens group with positive optical power, and a beam splitter.

[0006] The first zoom lens group, the second zoom lens group, the focusing lens group, and the adjusting lens group move along the main optical axis of the dual-optical zoom lens.

[0007] The second zoom lens group consists of a fifth zoom lens with positive optical power, a sixth zoom lens with negative optical power, a seventh zoom lens with positive optical power, an eighth zoom lens with negative optical power, and a ninth zoom lens with positive optical power. The sixth zoom lens and the seventh zoom lens are cemented together, and the eighth zoom lens and the ninth zoom lens are cemented together.

[0008] The dual-light zoom lens satisfies the following condition:

[0009] ft / fw > 20;

[0010] XG2+DG2>DG36;

[0011] Wherein, ft is the focal length of the dual-light zoom lens in telephoto mode, fw is the focal length of the dual-light zoom lens in wide-angle mode, XG2 is the moving distance of the first zoom lens group, DG2 is the total optical length of the first zoom lens group, and DG36 is the total optical length of the second zoom lens group to the beam splitter.

[0012] In this technical solution, by significantly increasing the number of moving groups within the zoom lens and increasing the moving distance of the front group to a certain extent, and by increasing the number of cemented lenses in the second zoom lens group after the aperture stop, the aberrations and coma of the zoom lens are greatly reduced. This enables the dual-light zoom lens to achieve a large magnification while being miniaturized, thus increasing the applicability of the dual-light zoom lens.

[0013] Preferably, the second zoom lens group and the adjustment lens group each have one and only one aspherical lens.

[0014] In this technical solution, by setting a small number of aspherical lenses in the rear group, the cost of dual-light zoom lenses is greatly reduced, and the number of lenses is also reduced, thus achieving miniaturization of dual-light zoom lenses.

[0015] Preferably, the first zoom lens group consists of a first zoom lens with negative optical power, a second zoom lens with negative optical power, a third zoom lens with positive optical power, and a fourth zoom lens with negative optical power.

[0016] Preferably, the fixed lens group consists of a first fixed lens with negative optical power, a second fixed lens with positive optical power, a third fixed lens with positive optical power, and a fourth fixed lens with positive optical power, wherein the first fixed lens and the second fixed lens are cemented together.

[0017] Preferably, the focusing lens group is a single focusing lens with negative optical power.

[0018] Preferably, the adjustment lens group consists of a first adjustment lens with negative optical power, a second adjustment lens with positive optical power, a third adjustment lens with positive optical power, and a fourth adjustment lens with positive optical power, wherein the first adjustment lens and the second adjustment lens are cemented together.

[0019] Preferably, the adjusting lens group is a fourth adjusting lens with positive optical power.

[0020] Preferably, the fourth adjusting lens satisfies the following condition:

[0021] 4 < fd4 / fw < 5;

[0022] Wherein, fd4 is the focal length of the fourth adjusting lens.

[0023] In this technical solution, by limiting the focal length of the fourth adjusting lens, the imaging quality of the object-side group of the adjusting lens group is corrected, thereby increasing the imaging quality of the dual-light zoom lens.

[0024] Preferably, the adjusting lens group satisfies the following condition:

[0025] 3.5 < fG5 / fw < 4.5;

[0026] Wherein, fG5 is the focal length of the adjustable lens group.

[0027] In this technical solution, by adjusting the focal length of the lens group, the possibility of anomalies when light exits the lens group is reduced, thereby correcting the imaging quality of the object-side group of the lens group and increasing the imaging quality of the dual-light zoom lens.

[0028] Preferably, the dual-light zoom lens satisfies the following condition:

[0029] 0.8 < XG2 / DG36 < 1.2.

[0030] In this technical solution, by limiting the above parameters, the moving distance of the first zoom lens group is increased and the total optical length of the first zoom lens group is reduced. At the same time, combined with the fact that the aperture can move with the second zoom lens group, the total optical length of the dual-light zoom lens is further reduced, thus realizing the miniaturization of the dual-light zoom lens.

[0031] Preferably, the dual-light zoom lens satisfies the following condition:

[0032] 0.25 < XG2 / TTL < 0.3;

[0033] TTL is the total optical length of the dual-optical zoom lens.

[0034] In this technical solution, by limiting the above parameters, the moving distance of the first zoom lens group is further limited, reducing the possibility of the first zoom lens group moving too far, and realizing the miniaturization of the dual-light zoom lens.

[0035] Preferably, the dual-light zoom lens satisfies the following condition:

[0036] 1.9 < ΦG1 / ΦG2 < 2;

[0037] ΦG1 is the outer diameter of the fixed lens group, and ΦG2 is the outer diameter of the first zoom lens group.

[0038] In this technical solution, the aperture of the dual-light zoom lens is limited by limiting the outer diameter of the two groups in the front group. This is beneficial for adjusting the optical path inside the dual-light zoom lens and also for miniaturizing the dual-light zoom lens.

[0039] One of the objectives of this invention is to provide an imaging device, characterized in that it includes: a dual-optical zoom lens; and an imaging element configured to receive an image formed by the dual-optical zoom lens.

[0040] Compared with the prior art, the dual-light zoom lens and imaging device provided by the present invention have the following advantages:

[0041] Beneficial effects:

[0042] 1. By significantly increasing the number of moving groups within the zoom lens and increasing the moving distance of the front group to a certain extent, and by increasing the number of cemented lenses in the second zoom lens group after the aperture stop, the aberrations and coma of the zoom lens are greatly reduced. This allows the dual-light zoom lens to achieve a large magnification while being miniaturized, thus increasing the applicability of the dual-light zoom lens.

[0043] 2. By adjusting the focal length of the lens group, the possibility of abnormalities when light exits the lens group is reduced, thus correcting the imaging quality of the object-side group of the lens group and increasing the imaging quality of the dual-light zoom lens.

[0044] 3. By limiting the outer diameter of the two groups in the front group, the aperture of the dual-light zoom lens is limited, which is beneficial for adjusting the internal optical path of the dual-light zoom lens and also for miniaturizing the dual-light zoom lens. Attached Figure Description

[0045] 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 dual-light zoom lens and imaging device.

[0046] Figure 1 This is a schematic diagram of the structure of a dual-light zoom lens according to the present invention;

[0047] Figure 2 This is a coma diagram of a dual-optical zoom lens in wide-angle mode according to the present invention.

[0048] Figure 3 This is an aberration diagram of a dual-optical zoom lens in wide-angle mode according to the present invention;

[0049] Figure 4 This is a coma diagram of a dual-light zoom lens in telephoto mode according to the present invention.

[0050] Figure 5 This is an aberration diagram of a dual-light zoom lens in telephoto mode according to the present invention;

[0051] Figure 6 This is a schematic diagram of another dual-light zoom lens according to the present invention;

[0052] Figure 7 This is another coma diagram of the wide-angle state of the dual-light zoom lens of the present invention;

[0053] Figure 8 This is another aberration diagram of the wide-angle state of the dual-light zoom lens of the present invention;

[0054] Figure 9 This is another coma diagram of the telephoto state of the dual-light zoom lens of the present invention;

[0055] Figure 10 This is another aberration diagram of the telephoto state of the dual-light zoom lens of the present invention.

[0056] Explanation of reference numerals: G1, Fixed lens group; G2, First zoom lens group; G3, Second zoom lens group; G4, Focusing lens group; G5, Adjusting lens group; G6, Beam splitter; G7, Auxiliary component; a1, First fixed lens; a2, Second fixed lens; a3, Third fixed lens; a4, Fourth fixed lens; b1, First zoom lens; b2, Second zoom lens; b3, Third zoom lens; b4, Fourth zoom lens; b5, Fifth zoom lens; b6, Sixth zoom lens; b7, Seventh zoom lens; b8, Eighth zoom lens; b9, Ninth zoom lens; c1, Focusing lens; d1, First adjusting lens; d2, Second adjusting lens; d3, Third adjusting lens; d4, Fourth adjusting lens; STO, Aperture stop; CG, Protective glass. Detailed Implementation

[0057] 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.

[0058] 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."

[0059] Example 1

[0060] like Figure 1 As shown, a dual-light zoom lens is composed of, from the object plane side to the image plane side, a fixed lens group G1 with positive optical power, a first zoom lens group G2 with negative optical power, a second zoom lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, an adjusting lens group G5 with positive optical power, and a beam splitter G6.

[0061] The first zoom lens group G2, the second zoom lens group G3, the focusing lens group G4, and the adjusting lens group G5 move along the main optical axis of the dual-optical zoom lens;

[0062] The second zoom lens group G3 consists of a fifth zoom lens b5 with positive optical power, a sixth zoom lens b6 with negative optical power, a seventh zoom lens b7 with positive optical power, an eighth zoom lens b8 with negative optical power, and a ninth zoom lens b9 with positive optical power. The sixth zoom lens b6 and the seventh zoom lens b7 are cemented together, and the eighth zoom lens b8 and the ninth zoom lens b9 are cemented together.

[0063] The dual-light zoom lens satisfies the following condition:

[0064] ft / fw > 20;

[0065] XG2+DG2>DG36;

[0066] Wherein, ft is the focal length of the dual-light zoom lens in telephoto mode, fw is the focal length of the dual-light zoom lens in wide-angle mode, XG2 is the moving distance of the first zoom lens group G2, DG2 is the total optical length of the first zoom lens group G2, and DG36 is the total optical length of the second zoom lens group G3 to the beam splitter G6.

[0067] In this embodiment, by significantly increasing the number of moving groups within the zoom lens and increasing the moving distance of the front group to a certain extent, and by increasing the number of cemented lenses within the second zoom lens group G3 after the aperture stop STO, the aberrations and coma of the zoom lens are greatly reduced. This achieves a larger magnification while miniaturizing the dual-light zoom lens, thus increasing the applicability of the dual-light zoom lens.

[0068] The second zoom lens group G3 and the adjustment lens group G5 each have one and only one aspherical lens.

[0069] By using a small number of aspherical lenses in the rear array, the cost of dual-light zoom lenses is greatly reduced, as is the number of lenses, thus achieving miniaturization of dual-light zoom lenses.

[0070] The first zoom lens group G2 consists of a first zoom lens b1 with negative optical power, a second zoom lens b2 with negative optical power, a third zoom lens b3 with positive optical power, and a fourth zoom lens b4 with negative optical power.

[0071] The fixed lens group G1 consists of a first fixed lens a1 with negative optical power, a second fixed lens a2 with positive optical power, a third fixed lens a3 with positive optical power, and a fourth fixed lens a4 with positive optical power. The first fixed lens a1 and the second fixed lens a2 are cemented together.

[0072] The focusing lens group G4 is a negative optical power focusing lens c1.

[0073] The adjustment lens group G5 consists of a first adjustment lens d1 with negative optical power, a second adjustment lens d2 with positive optical power, a third adjustment lens d3 with positive optical power, and a fourth adjustment lens d4 with positive optical power. The first adjustment lens d1 and the second adjustment lens d2 are cemented together.

[0074] The adjusting lens group G5 is a fourth adjusting lens d4 with positive optical power.

[0075] The fourth adjusting lens d4 satisfies the following condition:

[0076] 4 < fd4 / fw < 5;

[0077] Wherein, fd4 is the focal length of the fourth adjusting lens d4.

[0078] By limiting the focal length of the fourth adjusting lens d4, the imaging quality of the object-side group of the adjusting lens group G5 is corrected, thereby increasing the imaging quality of the dual-light zoom lens.

[0079] The adjusting lens group G5 satisfies the following condition:

[0080] 3.5 < fG5 / fw < 4.5;

[0081] Wherein, fG5 is the focal length of the adjustable lens group G5.

[0082] By adjusting the focal length of lens group G5, the possibility of abnormalities in light emitted from lens group G5 is reduced, thereby correcting the image quality of the object-side group of lens group G5 and improving the image quality of the dual-light zoom lens.

[0083] The dual-light zoom lens satisfies the following condition:

[0084] 0.8 < XG2 / DG36 < 1.2.

[0085] By limiting the parameters mentioned above, the moving distance of the first zoom lens group G2 is increased, and the total optical length of the first zoom lens group G2 is reduced. At the same time, combined with the fact that the aperture stop STO can move with the second zoom lens group, the total optical length of the dual-light zoom lens is further reduced, thus realizing the miniaturization of the dual-light zoom lens.

[0086] The dual-light zoom lens satisfies the following condition:

[0087] 0.25 < XG2 / TTL < 0.3;

[0088] TTL is the total optical length of the dual-optical zoom lens.

[0089] By limiting the parameters mentioned above, the movement distance of the first zoom lens group G2 is further limited, reducing the possibility of the first zoom lens group G2 moving too far, and realizing the miniaturization of the dual-light zoom lens.

[0090] The dual-light zoom lens satisfies the following condition:

[0091] 1.9 < ΦG1 / ΦG2 < 2;

[0092] ΦG1 is the outer diameter of the fixed lens group G1, and ΦG2 is the outer diameter of the first zoom lens group G2.

[0093] By limiting the outer diameter of the two groups in the front group, the aperture of the dual-light zoom lens is limited, which is beneficial for adjusting the optical path inside the dual-light zoom lens and also for miniaturizing the dual-light zoom lens.

[0094] Example 2

[0095] like Figures 1 to 5 As shown, a dual-light zoom lens is composed of, from the object plane side to the image plane side, a fixed lens group G1 with positive optical power, a first zoom lens group G2 with negative optical power, an aperture stop STO, a second zoom lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, an adjusting lens group G5 with positive optical power, a beam splitter G6, and an auxiliary component G7.

[0096] The first zoom lens group G2, the second zoom lens group G3, the focusing lens group G4, and the adjusting lens group G5 move along the main optical axis of the dual-optical zoom lens;

[0097] The first zoom lens group G2 consists of a first zoom lens b1 with negative optical power, a second zoom lens b2 with negative optical power, a third zoom lens b3 with positive optical power, and a fourth zoom lens b4 with negative optical power.

[0098] The second zoom lens group G3 consists of a fifth zoom lens b5 with positive optical power, a sixth zoom lens b6 with negative optical power, a seventh zoom lens b7 with positive optical power, an eighth zoom lens b8 with negative optical power, and a ninth zoom lens b9 with positive optical power. The sixth zoom lens b6 and the seventh zoom lens b7 are cemented together, and the eighth zoom lens b8 and the ninth zoom lens b9 are cemented together.

[0099] The focusing lens group G4 is a negative optical power focusing lens c1.

[0100] The adjustment lens group G5 consists of a first adjustment lens d1 with negative optical power, a second adjustment lens d2 with positive optical power, a third adjustment lens d3 with positive optical power, and a fourth adjustment lens d4 with positive optical power. The first adjustment lens d1 and the second adjustment lens d2 are cemented together.

[0101] The auxiliary component G7 is a protective glass CG.

[0102] The basic lens data of the dual-light 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.

[0103] 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.

[0104] In Table 2, the WIDE column indicates the specific values ​​of each variable parameter when the dual-optical zoom lens is in wide-angle mode, and the TELE column indicates the specific values ​​of each variable parameter when the dual-optical zoom lens is in telephoto mode.

[0105] In Table 3, K is the conic coefficient, and e is the scientific notation, for example, e-005 represents 10. -5 .

[0106] Table 1

[0107]

[0108]

[0109] Table 2

[0110]

[0111]

[0112] Table 3

[0113]

[0114] In this embodiment, ft = 226mm, fw = 10.45mm, ft / fw = 21.63, fno = 1.66-4.54, and TTL = 170mm;

[0115] Wherein, ft is the focal length of the dual-light zoom lens in telephoto mode, fw is the focal length of the dual-light zoom lens in wide-angle mode, fno is the aperture number of the dual-light zoom lens, and TTL is the total optical length of the dual-light zoom lens.

[0116] XG2=50.29mm, DG2=15.02mm, XG2+DG2=65.31mm, DG36=50.14mm;

[0117] XG2 / DG36 = 1.003;

[0118] XG2 / TTL = 0.296;

[0119] XG2 is the moving distance of the first zoom lens group G2, DG2 is the total optical length of the first zoom lens group G2, and DG36 is the total optical length of the second zoom lens group G3 to the beam splitter G6.

[0120] fd4=45.95mm, fd4 / fw=4.4;

[0121] fG5=41.56mm, fG5 / fw=3.98;

[0122] Wherein, fd4 is the focal length of the fourth adjusting lens d4, and fG5 is the focal length of the adjusting lens group G5.

[0123] ΦG1=60.1mm, ΦG2=30.5mm;

[0124] ΦG1 / ΦG2=1.97;

[0125] ΦG1 is the outer diameter of the fixed lens group G1, and ΦG2 is the outer diameter of the first zoom lens group G2.

[0126] Example 3

[0127] like Figures 6 to 10 As shown, a dual-light zoom lens is composed of, from the object plane side to the image plane side, a fixed lens group G1 with positive optical power, a first zoom lens group G2 with negative optical power, an aperture stop STO, a second zoom lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, an adjusting lens group G5 with positive optical power, and a beam splitter G6.

[0128] The first zoom lens group G2, the second zoom lens group G3, the focusing lens group G4, and the adjusting lens group G5 move along the main optical axis of the dual-optical zoom lens;

[0129] The first zoom lens group G2 consists of a first zoom lens b1 with negative optical power, a second zoom lens b2 with negative optical power, a third zoom lens b3 with positive optical power, and a fourth zoom lens b4 with negative optical power.

[0130] The second zoom lens group G3 consists of a fifth zoom lens b5 with positive optical power, a sixth zoom lens b6 with negative optical power, a seventh zoom lens b7 with positive optical power, an eighth zoom lens b8 with negative optical power, and a ninth zoom lens b9 with positive optical power. The sixth zoom lens b6 and the seventh zoom lens b7 are cemented together, and the eighth zoom lens b8 and the ninth zoom lens b9 are cemented together.

[0131] The focusing lens group G4 is a negative optical power focusing lens c1.

[0132] The adjusting lens group G5 is a fourth adjusting lens d4 with positive optical power.

[0133] The basic lens data of the dual-light 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.

[0134] 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.

[0135] In Table 5, the WIDE column indicates the specific values ​​of each variable parameter when the dual-optical zoom lens is in wide-angle mode, and the TELE column indicates the specific values ​​of each variable parameter when the dual-optical zoom lens is in telephoto mode.

[0136] In Table 6, K is the conic coefficient, and e is the scientific notation, for example, e-005 represents 10. -5 .

[0137] Table 4

[0138]

[0139]

[0140] Table 5

[0141] WIDE TELE D1 1 47.9 D2 66.01 1.68 D3 1 2.73 D4 7.18 27.7 D5 6.02 1.2

[0142] Table 6

[0143]

[0144] In this embodiment, ft = 220mm, fw = 11mm, ft / fw = 20, fno = 1.64-4.03, and TTL = 170mm;

[0145] Wherein, ft is the focal length of the dual-light zoom lens in telephoto mode, fw is the focal length of the dual-light zoom lens in wide-angle mode, fno is the aperture number of the dual-light zoom lens, and TTL is the total optical length of the dual-light zoom lens.

[0146] XG2=46.9mm, DG2=15.61mm, XG2+DG2=62.51mm, DG36=51.8mm;

[0147] XG2 / DG36 = 0.9;

[0148] XG2 / TTL = 0.276;

[0149] XG2 is the moving distance of the first zoom lens group G2, DG2 is the total optical length of the first zoom lens group G2, and DG36 is the total optical length of the second zoom lens group G3 to the beam splitter G6.

[0150] fG5=fd4=46.48mm, fG5 / fw=fd4 / fw=4.23;

[0151] Wherein, fd4 is the focal length of the fourth adjusting lens d4, and fG5 is the focal length of the adjusting lens group G5.

[0152] ΦG1=63.22mm, ΦG2=32.23mm;

[0153] ΦG1 / ΦG2=1.96;

[0154] ΦG1 is the outer diameter of the fixed lens group G1, and ΦG2 is the outer diameter of the first zoom lens group G2.

[0155] Example 4

[0156] An imaging device, such as Figures 1 to 10 As shown, it includes: a dual-light zoom lens as described in any of the above embodiments, and an imaging element configured to receive an image formed by the dual-light zoom lens.

[0157] 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 dual-light zoom lens, characterized in that, The dual-light zoom lens consists of, from the object plane side to the image plane side, a fixed lens group with positive optical power, a first zoom lens group with negative optical power, an aperture stop, a second zoom lens group with positive optical power, a focusing lens group with negative optical power, an adjusting lens group with positive optical power, and a beam splitter. The first zoom lens group, the second zoom lens group, the focusing lens group, and the adjusting lens group move along the main optical axis of the dual-optical zoom lens. The second zoom lens group consists of a fifth zoom lens with positive optical power, a sixth zoom lens with negative optical power, a seventh zoom lens with positive optical power, an eighth zoom lens with negative optical power, and a ninth zoom lens with positive optical power. The sixth zoom lens and the seventh zoom lens are cemented together, and the eighth zoom lens and the ninth zoom lens are cemented together. The first zoom lens group consists of a first zoom lens with negative optical power, a second zoom lens with negative optical power, a third zoom lens with positive optical power, and a fourth zoom lens with negative optical power. The fixed lens group consists of a first fixed lens with negative optical power, a second fixed lens with positive optical power, a third fixed lens with positive optical power, and a fourth fixed lens with positive optical power, wherein the first fixed lens and the second fixed lens are cemented together. The focusing lens group is a single focusing lens with negative optical power; The dual-light zoom lens satisfies the following condition: ft / fw > 20; XG2+DG2>DG36; Wherein, ft is the focal length of the dual-light zoom lens in telephoto mode, fw is the focal length of the dual-light zoom lens in wide-angle mode, XG2 is the moving distance of the first zoom lens group, DG2 is the total optical length of the first zoom lens group, and DG36 is the total optical length of the second zoom lens group to the beam splitter.

2. The dual-light zoom lens according to claim 1, characterized in that: The second zoom lens group and the adjustment lens group each have one and only one aspherical lens.

3. A dual-light zoom lens according to claim 1, characterized in that: The adjustment lens group consists of a first adjustment lens with negative optical power, a second adjustment lens with positive optical power, a third adjustment lens with positive optical power, and a fourth adjustment lens with positive optical power. The first adjustment lens and the second adjustment lens are cemented together.

4. A dual-light zoom lens according to claim 1, characterized in that: The adjustable lens group is a fourth adjustable lens with positive optical power.

5. A dual-light zoom lens according to claim 3 or 4, characterized in that: The fourth adjustment lens satisfies the following condition: 4 < fd4 / fw < 5; Wherein, fd4 is the focal length of the fourth adjusting lens.

6. A dual-light zoom lens according to claim 3, characterized in that: The adjustable lens group satisfies the following condition: 3.5 < fG5 / fw < 4.5; Wherein, fG5 is the focal length of the adjustable lens group.

7. A dual-light zoom lens according to claim 1, characterized in that: The dual-light zoom lens satisfies the following condition: 0.8 < XG2 / DG36 < 1.

2.

8. A dual-light zoom lens according to claim 1, characterized in that: The dual-light zoom lens satisfies the following condition: 0.25 < XG2 / TTL < 0.3; TTL is the total optical length of the dual-optical zoom lens.

9. A dual-light zoom lens according to claim 1, characterized in that: The dual-light zoom lens satisfies the following condition: 1.9 < ΦG1 / ΦG2 < 2; ΦG1 is the outer diameter of the fixed lens group, and ΦG2 is the outer diameter of the first zoom lens group.

10. An imaging device, characterized in that, include: The dual-optical zoom lens as described in any one of claims 1 to 9; An imaging element is configured to receive an image formed by the dual-optical zoom lens.

Images