Zoom lens and imaging device

Abstract

The present application relates to the field of optics, in particular 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 second fixed lens group with positive focal power, a focusing lens group with negative focal power, and a third fixed lens group with positive focal power. The zoom lens satisfies the following conditions: ft / fw>24; TTL<95mm; fnow<1.8; 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, TTL is the total optical length of the zoom lens, and fnow is the aperture number of the zoom lens in the wide-angle state. The zoom lens can achieve a large magnification and miniaturization effect, and can also increase the aperture of the zoom lens, thereby realizing the possibility of using the zoom lens in a relatively narrow range under low light conditions and increasing the application range 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 camera 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 scenery. 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] For high-magnification, multi-group zoom lenses, due to the need for high magnification, there are usually more lens elements and a larger zoom range. Moving the lens groups requires a greater distance to zoom. Therefore, high-magnification zoom lenses are usually larger in size or have a smaller aperture, making them difficult to use in low-light environments within a relatively narrow range. Summary of the Invention

[0004] This invention addresses existing technical problems by providing a zoom lens and imaging device that achieves both high magnification and miniaturization, while also increasing the zoom lens aperture. This enables the zoom lens to be used in low-light environments within a relatively narrow range, thus expanding its applicability.

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

[0006] A zoom lens, comprising, 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, a second fixed lens group with positive optical power, a focusing lens group with negative optical power, and a third fixed lens group with positive optical power; the zoom lens group and the focusing lens group are movable along the principal optical axis of the zoom lens; the first fixed lens group, from the object plane side to the image plane side, comprises, in sequence, 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, the first fixed... The lens and the second fixed lens are cemented together; the 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, arranged sequentially from the object plane side to the image plane side; the zoom lens satisfies the following conditions: ft / fw > 24; TTL < 95mm; fnow < 1.8; where 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, and fnow is the aperture number of the zoom lens in wide-angle mode.

[0007] In this technical solution, by limiting the above-mentioned lens group and parameters, it is possible to achieve the effects of high magnification and miniaturization of the zoom lens. At the same time, it is also possible to increase the aperture of the zoom lens, making it possible to use the zoom lens in low-light environments within a relatively narrow range, thus increasing the applicability of the zoom lens.

[0008] Preferably, the second fixed lens group includes at least one set of cemented triplet lenses;

[0009] or

[0010] The second fixed lens group includes at least two sets of cemented lenses.

[0011] In this technical solution, the use of cemented lenses greatly improves the chromatic aberration and astigmatism of zoom lenses, thereby increasing the image quality.

[0012] Preferably, both the zoom lens group and the second fixed lens group are provided with at least one aspherical lens.

[0013] In this technical solution, by using an aspherical lens, the aberrations and distortions of the zoom lens are reduced, the resolving power of the zoom lens is increased, and the imaging quality of the zoom lens is improved.

[0014] Preferably, the second fixed lens group consists of a fifth fixed lens with positive optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, an eighth fixed lens with positive optical power, and a ninth fixed lens with positive optical power, from the object plane side to the image plane side. The sixth fixed lens, the seventh fixed lens, and the eighth fixed lens form a cemented three-layer lens.

[0015] Preferably, the third fixed lens group is a tenth fixed lens with positive optical power.

[0016] Preferably, the second fixed lens group consists of a fifth fixed lens with positive optical power, a sixth fixed lens with negative optical power, a seventh fixed lens with positive optical power, an eighth fixed lens with negative optical power, and a ninth fixed lens with positive optical power, from the object plane side to the image plane side. The sixth and seventh fixed lenses are cemented together, and the eighth and ninth fixed lenses are cemented together.

[0017] Preferably, the third fixed lens group consists of a tenth fixed lens with negative optical power and an eleventh fixed lens with positive optical power, arranged sequentially from the object plane side to the image plane side, and the tenth fixed lens and the eleventh fixed lens are cemented together.

[0018] Preferably, the focusing lens group consists of a first focusing lens with positive optical power and a second focusing lens with negative optical power, arranged sequentially from the object plane side to the image plane side, and the first focusing lens and the second focusing lens are cemented together.

[0019] Preferably, the zoom lens satisfies the following condition:

[0020] 0.3 < XG2 / TTL < 0.4;

[0021] XG4 / XG2 < 0.2;

[0022] Wherein, XG2 is the maximum moving distance of the zoom lens group, and XG4 is the maximum moving distance of the focusing lens group.

[0023] In this technical solution, by limiting the above parameters, both the zoom lens group and the focusing lens can increase the resolution of the zoom lens, while preventing the zoom lens from becoming too large, thus achieving the miniaturization of the zoom lens.

[0024] Preferably, the zoom lens satisfies the following condition:

[0025] 2 < fG3 / fw < 2.5;

[0026] Wherein, fG3 is the combined focal length of the second fixed lens group.

[0027] In this technical solution, by setting the parameters of the second fixed lens group, a large aperture effect of a zoom lens is achieved within a certain volume range.

[0028] 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.

[0029] Compared with the prior art, the zoom lens and imaging device provided by the present invention have the following beneficial effects:

[0030] 1. By limiting the lens group and parameters mentioned above, it is possible to achieve high magnification and miniaturization of zoom lenses. At the same time, it is also possible to increase the aperture of zoom lenses, making it possible to use zoom lenses in low-light environments within a relatively narrow range, thus increasing the applicability of zoom lenses.

[0031] 2. By using aspherical lenses, aberrations and distortions in zoom lenses are reduced, increasing their resolving power and image quality.

[0032] 3. By limiting the parameters mentioned above, both the zoom lens group and the focusing lens can increase the resolution of the zoom lens, while preventing the zoom lens from becoming too large, thus achieving the miniaturization of the zoom lens. Attached Figure Description

[0033] 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.

[0034] Figure 1 This is a schematic diagram of the structure of a zoom lens according to the present invention;

[0035] Figure 2 This invention provides a coma diagram of a zoom lens in telephoto mode.

[0036] Figure 3 This is an aberration diagram of a zoom lens in telephoto mode according to the present invention;

[0037] Figure 4 This invention relates to a coma diagram of a zoom lens in a wide-angle state.

[0038] Figure 5 This is an aberration diagram of a zoom lens in a wide-angle state according to the present invention;

[0039] Figure 6 This is a schematic diagram of another zoom lens according to the present invention;

[0040] Figure 7 This is another coma diagram of the zoom lens in telephoto mode according to the present invention;

[0041] Figure 8 This is another aberration diagram of the zoom lens in telephoto mode according to the present invention;

[0042] Figure 9 This is another coma diagram of the zoom lens in the wide-angle state according to the present invention;

[0043] Figure 10 This is another aberration diagram of the zoom lens in the wide-angle state according to the present invention.

[0044] Explanation of reference numerals: G1, First fixed lens group; G2, Zoom lens group; G3, Second fixed lens group; G4, Focusing lens group; G5, Third fixed lens group; G6, Auxiliary component; 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; a8, Eighth fixed lens; a9, Ninth fixed lens; a10, Tenth fixed lens; a11, Eleventh fixed lens; b1, First zoom lens; b2, Second zoom lens; b3, Third zoom lens; b4, Fourth zoom lens; c1, First focusing lens; c2, Second focusing lens; STO, Aperture stop; CG, Protective glass. Detailed Implementation

[0045] 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.

[0046] 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."

[0047] Example 1

[0048] like Figure 1 and Figure 6 As shown, a zoom lens is composed of a first fixed lens group G1 with positive optical power, a zoom lens group G2 with negative optical power, a second fixed lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, and a third fixed lens group G5 with positive optical power, arranged sequentially from the object plane side to the image plane side.

[0049] The zoom lens group G2 and the focusing lens group G4 move along the main optical axis of the zoom lens;

[0050] The first 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, from the object plane side to the image plane side. The first fixed lens a1 and the second fixed lens a2 are cemented together.

[0051] The 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, arranged sequentially from the object plane side to the image plane side.

[0052] The zoom lens satisfies the following condition:

[0053] ft / fw > 24;

[0054] TTL < 95mm;

[0055] fnow < 1.8;

[0056] 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, and fnow is the aperture number of the zoom lens in wide-angle mode.

[0057] By limiting the lens group and parameters mentioned above, it is possible to achieve high magnification and miniaturization of zoom lenses. At the same time, it is also possible to increase the aperture of zoom lenses, making it possible to use zoom lenses in low-light environments within a relatively narrow range, thus increasing the applicability of zoom lenses.

[0058] The second fixed lens group G3 includes at least one set of cemented triplet lenses;

[0059] or

[0060] The second fixed lens group G3 includes at least two sets of cemented lenses.

[0061] In this embodiment, the use of a cemented lens greatly improves the chromatic aberration and astigmatism of the zoom lens, thereby increasing the image quality.

[0062] Both the zoom lens group G2 and the second fixed lens group G3 are equipped with at least one aspherical lens.

[0063] By using aspherical lenses, aberrations and distortions in zoom lenses are reduced, while resolving power and image quality are increased.

[0064] The second fixed lens group G3 consists of a fifth fixed lens a5 with positive optical power, a sixth fixed lens a6 with positive optical power, a seventh fixed lens a7 with negative optical power, an eighth fixed lens a8 with positive optical power, and a ninth fixed lens a9 with positive optical power, from the object plane side to the image plane side. The sixth fixed lens a6, the seventh fixed lens a7, and the eighth fixed lens a8 form a cemented three-layer lens.

[0065] The third fixed lens group G5 is a tenth fixed lens a10 with positive optical power.

[0066] The second fixed lens group G3 consists of a fifth fixed lens a5 with positive optical power, a sixth fixed lens a6 with negative optical power, a seventh fixed lens a7 with positive optical power, an eighth fixed lens a8 with negative optical power, and a ninth fixed lens a9 with positive optical power, from the object plane side to the image plane side. The sixth fixed lens a6 and the seventh fixed lens a7 are cemented together, and the eighth fixed lens a8 and the ninth fixed lens a9 are cemented together.

[0067] The third fixed lens group G5 consists of a tenth fixed lens a10 with negative optical power and an eleventh fixed lens a10 with positive optical power, arranged sequentially from the object plane side to the image plane side. The tenth fixed lens a10 and the eleventh fixed lens a11 are cemented together.

[0068] The focusing lens group G4 consists of a first focusing lens c1 with positive optical power and a second focusing lens c2 with negative optical power, arranged sequentially from the object plane side to the image plane side. The first focusing lens c1 and the second focusing lens c2 are cemented together.

[0069] The zoom lens satisfies the following condition:

[0070] 0.3 < XG2 / TTL < 0.4;

[0071] XG4 / XG2 < 0.2;

[0072] Wherein, XG2 is the maximum moving distance of the zoom lens group G2, and XG4 is the maximum moving distance of the focusing lens group G4.

[0073] By limiting the parameters mentioned above, both the zoom lens group G2 and the focusing lens can increase the resolution of the zoom lens, while preventing the zoom lens from becoming too large, thus achieving miniaturization of the zoom lens.

[0074] The zoom lens satisfies the following condition:

[0075] 2 < fG3 / fw < 2.5;

[0076] Wherein, fG3 is the combined focal length of the second fixed lens group G3.

[0077] By setting the parameters of the second fixed lens group G3, a large aperture effect of a zoom lens can be achieved within a certain volume range.

[0078] Example 2

[0079] like Figures 1 to 5 As shown, a zoom lens is composed of, from the object plane side to the image plane side, a first fixed lens group G1 with positive optical power, a zoom lens group G2 with negative optical power, an aperture stop STO, a second fixed lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, a third fixed lens group G5 with positive optical power, and an auxiliary component G6.

[0080] The zoom lens group G2 and the focusing lens group G4 move along the main optical axis of the zoom lens;

[0081] The first 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, from the object plane side to the image plane side. The first fixed lens a1 and the second fixed lens a2 are cemented together.

[0082] The 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, arranged sequentially from the object plane side to the image plane side.

[0083] The second fixed lens group G3 consists of a fifth fixed lens a5 with positive optical power, a sixth fixed lens a6 with positive optical power, a seventh fixed lens a7 with negative optical power, an eighth fixed lens a8 with positive optical power, and a ninth fixed lens a9 with positive optical power, from the object plane side to the image plane side. The sixth fixed lens a6, the seventh fixed lens a7, and the eighth fixed lens a8 form a cemented three-layer lens.

[0084] The focusing lens group G4 consists of a first focusing lens c1 with positive optical power and a second focusing lens c2 with negative optical power, arranged sequentially from the object plane side to the image plane side. The first focusing lens c1 and the second focusing lens c2 are cemented together.

[0085] The third fixed lens group G5 is a tenth fixed lens a10 with positive optical power.

[0086] The auxiliary component G6 is a protective glass CG.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] In Table 3, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0091] Table 1

[0092]

[0093]

[0094] Table 2

[0095] WIDE TELE D1 0.5 31.61 D2 32.24 1.13 D3 0.7 5.75 D4 13.13 8.08

[0096] Table 3

[0097]

[0098] In this embodiment, ft = 130mm, fw = 5.3mm, ft / fw = 24.53, TTL = 90.49mm, fnow = 1.67, and fnot = 4.48;

[0099] 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.

[0100] XG2=31.11mm, XG2 / TTL=0.344;

[0101] XG4=5.05mm, XG4 / XG2=0.162.

[0102] Wherein, XG2 is the maximum moving distance of the zoom lens group G2, and XG4 is the maximum moving distance of the focusing lens group G4.

[0103] fG3=12.48mm, fG3 / fw=2.35;

[0104] Wherein, fG3 is the combined focal length of the second fixed lens group G3.

[0105] Example 3

[0106] like Figures 6 to 10 As shown, a zoom lens is composed of, from the object plane side to the image plane side, a first fixed lens group G1 with positive optical power, a zoom lens group G2 with negative optical power, an aperture stop STO, a second fixed lens group G3 with positive optical power, a focusing lens group G4 with negative optical power, a third fixed lens group G5 with positive optical power, and an auxiliary component G6.

[0107] The zoom lens group G2 and the focusing lens group G4 move along the main optical axis of the zoom lens;

[0108] The first 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, from the object plane side to the image plane side. The first fixed lens a1 and the second fixed lens a2 are cemented together.

[0109] The 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, arranged sequentially from the object plane side to the image plane side.

[0110] The second fixed lens group G3 consists of a fifth fixed lens a5 with positive optical power, a sixth fixed lens a6 with negative optical power, a seventh fixed lens a7 with positive optical power, an eighth fixed lens a8 with negative optical power, and a ninth fixed lens a9 with positive optical power, from the object plane side to the image plane side. The sixth fixed lens a6 and the seventh fixed lens a7 are cemented together, and the eighth fixed lens a8 and the ninth fixed lens a9 are cemented together.

[0111] The focusing lens group G4 consists of a first focusing lens c1 with positive optical power and a second focusing lens c2 with negative optical power, arranged sequentially from the object plane side to the image plane side. The first focusing lens c1 and the second focusing lens c2 are cemented together.

[0112] The third fixed lens group G5 consists of a tenth fixed lens a10 with negative optical power and an eleventh fixed lens a11 with positive optical power, arranged sequentially from the object plane side to the image plane side. The tenth fixed lens a10 and the eleventh fixed lens a11 are cemented together.

[0113] The auxiliary component G6 is a protective glass CG.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] In Table 3, K is the conic coefficient, and e is the scientific notation, for example, e-05 represents 10. -5 .

[0118] Table 4

[0119]

[0120]

[0121] Table 5

[0122] WIDE TELE D1 0.5 31.61 D2 32.24 1.13 D3 0.7 5.75 D4 13.13 8.08

[0123] Table 6

[0124]

[0125] In this embodiment, ft = 130mm, fw = 5.3mm, ft / fw = 24.53, TTL = 89.81mm, fnow = 1.67, and fnot = 4.61;

[0126] 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.

[0127] XG2=30.45mm, XG2 / TTL=0.339;

[0128] XG4=4.6mm, XG4 / XG2=0.151.

[0129] Wherein, XG2 is the maximum moving distance of the zoom lens group G2, and XG4 is the maximum moving distance of the focusing lens group G4.

[0130] fG3=12.43mm, fG3 / fw=2.35;

[0131] Wherein, fG3 is the combined focal length of the second fixed lens group G3.

[0132] Example 4

[0133] An imaging device, such as Figures 1 to 10 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.

[0134] 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, a second fixed lens group with positive optical power, a focusing lens group with negative optical power, and a third fixed lens group with positive optical power. The zoom lens group and the focusing lens group move along the main optical axis of the zoom lens; The first 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, from the object plane side to the image plane side. The first fixed lens and the second fixed lens are cemented together. The 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, arranged sequentially from the object plane side to the image plane side. The second fixed lens group consists of a fifth fixed lens with positive optical power, a sixth fixed lens with positive optical power, a seventh fixed lens with negative optical power, an eighth fixed lens with positive optical power, and a ninth fixed lens with positive optical power, from the object plane side to the image plane side. The sixth, seventh, and eighth fixed lenses form a cemented three-layer lens. The third fixed lens group is a tenth fixed lens with positive optical power. Alternatively, the second fixed lens group may consist, from the object plane side to the image plane side, a fifth fixed lens with positive optical power, a sixth fixed lens with negative optical power, a seventh fixed lens with positive optical power, an eighth fixed lens with negative optical power, and a ninth fixed lens with positive optical power, wherein the sixth and seventh fixed lenses are cemented together, and the eighth and ninth fixed lenses are cemented together; the third fixed lens group may consist, from the object plane side to the image plane side, a tenth fixed lens with negative optical power and an eleventh fixed lens with positive optical power, wherein the tenth and eleventh fixed lenses are cemented together. The focusing lens group consists of a first focusing lens with positive optical power and a second focusing lens with negative optical power, arranged sequentially from the object plane side to the image plane side, and the first focusing lens and the second focusing lens are cemented together. The zoom lens satisfies the following condition: ft / fw > 24; TTL < 95mm; fnow < 1.8; 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, and fnow is the aperture number of the zoom lens in wide-angle mode.

2. A zoom lens according to claim 1, characterized in that: The second fixed lens group includes at least one set of cemented triplet lenses; or The second fixed lens group includes at least two sets of cemented lenses.

3. A zoom lens according to claim 1, characterized in that: Both the zoom lens group and the second fixed lens group contain at least one aspherical lens.

4. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: 0.3 < XG2 / TTL < 0.4; XG4 / XG2 < 0.2; Wherein, XG2 is the maximum moving distance of the zoom lens group, and XG4 is the maximum moving distance of the focusing lens group.

5. A zoom lens according to claim 1, characterized in that: The zoom lens satisfies the following condition: 2 < fG3 / fw < 2.5; Wherein, fG3 is the combined focal length of the second fixed lens group.

6. An imaging device, characterized in that, include: The zoom lens as described in any one of claims 1 to 5; And an imaging element, configured to receive an image formed by the zoom lens.

Images