CN113296251B - Zoom lens and imaging device - Google Patents

Zoom lens and imaging device Download PDF

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Publication number
CN113296251B
CN113296251B CN202110525070.9A CN202110525070A CN113296251B CN 113296251 B CN113296251 B CN 113296251B CN 202110525070 A CN202110525070 A CN 202110525070A CN 113296251 B CN113296251 B CN 113296251B
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lens
zoom lens
focal power
lens group
zoom
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CN113296251A (en
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袁浩生
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Jiaxing Zhongrun Optical Technology Co Ltd
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Jiaxing Zhongrun Optical Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
    • G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
    • G02B15/145121—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+-+
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention relates to the field of optics, in particular to a zoom lens and an imaging device. The zoom lens sequentially comprises from an object plane side to an image plane side: the lens comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with negative focal power and a fifth lens group with positive focal power; the zoom lens at least comprises four aspheric lenses; the zoom lens satisfies the following conditional expression: FNO is more than 1.5 and less than 4;15 < ft/fw < 20; wherein fno is the f-number of the zoom lens, ft is the focal length of the telephoto end of the zoom lens, and fw is the focal length of the wide-angle end of the zoom lens. The invention reduces the influence of the change of the environmental temperature on the zoom lens as much as possible, thereby reducing the possibility of the deviation of the focal plane of the zoom lens, reducing the possibility of the image blurring of the zoom lens and increasing the imaging quality of the zoom lens.

Description

Zoom lens and imaging device
Technical Field
The invention relates to the field of optics, in particular to a zoom lens and an imaging device.
Background
The zoom lens can change focal length within a certain range so as to obtain different wide and narrow field angles, images with different sizes and different scene ranges.
With the increasing popularization of zoom lenses, the zoom lenses play an important role in more and more fields such as monitoring and video signals, however, the current zoom lenses mainly use glass lenses, and it is more and more difficult to meet the increasing requirements of low cost, low weight and high imaging quality of the monitoring lenses.
The plastic lens can easily realize low cost and low weight due to physical and processing characteristics, and simultaneously meets the requirement of high imaging quality, but because the plastic has larger thermal expansion coefficient and refractive index temperature coefficient, the temperature drift of the zoom lens adopting the plastic lens is often far larger than that of the zoom lens only adopting a glass lens, namely when the environmental temperature changes, the focal plane can generate larger deviation, the phenomenon of picture blurring can often occur during use, and the imaging quality of the zoom lens is reduced.
Disclosure of Invention
The invention solves the technical problems in the prior art, and provides a zoom lens and an imaging device, which reduce the influence of the change of the ambient temperature on the zoom lens as much as possible, further reduce the possibility of the deviation of the focal plane of the zoom lens, reduce the possibility of the image blurring of the zoom lens, and increase the imaging quality of the zoom lens.
The technical scheme provided by the invention is as follows:
a zoom lens comprising, in order from an object plane side to an image plane side:
the lens comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with negative focal power and a fifth lens group with positive focal power;
the zoom lens at least comprises four aspheric lenses;
the zoom lens satisfies the following conditional expression:
1.5＜FNO＜4；
15＜ft/fw＜20；
wherein fno is the f-number of the zoom lens, ft is the focal length of the telephoto end of the zoom lens, and fw is the focal length of the wide-angle end of the zoom lens.
In the technical scheme, through the arrangement of the structure, the influence of the change of the ambient temperature on the zoom lens is reduced as much as possible, the possibility of the deviation of the focal plane of the zoom lens is reduced, the possibility of the blurring of the picture of the zoom lens is reduced, and the imaging quality of the zoom lens is improved.
Preferably, the second lens group includes at least two aspheric lenses.
In the technical scheme, the arrangement of a plurality of aspheric lenses in the second lens group further reduces the possibility of focal plane offset of the zoom lens in the zooming process, and increases the imaging quality of the zoom lens.
Preferably, the fourth lens group includes at least one aspheric lens.
In the technical scheme, by arranging the aspheric lens in the fourth lens group, the possibility of focal plane deviation of the zoom lens in the focusing process is reduced, and the imaging quality of the zoom lens is improved.
Preferably, the first lens group, the third lens group and the fifth lens group include at most two aspheric lenses.
According to the technical scheme, the cost of the zoom lens is reduced through setting a small number of aspheric lenses in the fixed lens group, the chromatic aberration and the coma aberration of the zoom lens are reduced, and the imaging quality of the zoom lens is improved.
Preferably, the third lens group includes at least one aspheric lens.
In the technical scheme, the aspheric lens is arranged in the third lens group, so that chromatic aberration and coma aberration of the zoom lens in a telephoto state and a wide-angle state are reduced, and the imaging quality of the zoom lens is improved.
Preferably, the aspherical lens in the third lens group is provided at one end close to the object surface side.
According to the technical scheme, through the arrangement of the structure, the chromatic aberration and the coma aberration of the rays in the rear group of the zoom lens are reduced, and the imaging quality of the zoom lens is improved.
Preferably, the first lens group includes, in order from an object plane side to an image plane side:
the lens comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power and a fourth lens with positive focal power.
Preferably, the second lens group includes, in order from the object plane side to the image plane side:
the lens comprises a fifth lens with negative focal power, a sixth lens with negative focal power, a seventh lens with positive focal power and an eighth lens with negative focal power.
Preferably, the third lens group includes, in order from the object plane side to the image plane side:
a ninth lens with positive focal power, a tenth lens with positive focal power, an eleventh lens with negative focal power, and a twelfth lens with positive focal power.
Preferably, the fourth lens group is a thirteenth lens with negative focal power;
and/or
The fifth lens group is a fourteenth lens with positive focal power.
Preferably, the zoom lens satisfies the following conditional expression:
0.15＜S4/S2＜0.25；
wherein S4 is a maximum moving distance of the fourth lens group, and S2 is a moving distance of the second lens group.
In the technical scheme, through the parameter limitation, on the basis that the fourth lens group can realize focusing, the moving distance of the fourth lens group is reduced, and then the miniaturization of the zoom lens is realized.
When the zoom lens is changed from the wide-angle state to the telephoto state or from the telephoto state to the wide-angle state, the fourth lens group moves to the image plane side and then moves to the object plane side.
In the technical scheme, through the arrangement of the structure, the aberration and the coma in the wide-angle state and the telescopic state of the zoom lens are reduced, and the imaging quality of the zoom lens is improved.
Preferably, the zoom lens satisfies the following conditional expression:
0.3＜BFL/DG1＜0.4；
BFL is the optical back focus of the zoom lens, and DG1 is the optical total length of the first lens group.
In the technical scheme, through the limitation of the parameters, the possibility of overlarge or undersize of the optical back focus of the zoom lens is reduced, the miniaturization of the zoom lens is realized, and meanwhile, the zoom lens has higher imaging quality.
Preferably, the zoom lens satisfies the following conditional expression:
-1.05＜f7/f8＜-0.95；
wherein f7 is a focal length of the seventh lens element, and f8 is a focal length of the eighth lens element.
In the technical scheme, the temperature drift compensation of the seventh lens and the eighth lens is realized through the limitation of the focal lengths of the seventh lens and the eighth lens and because the focal powers of the seventh lens and the eighth lens have opposite signs.
It is also an object of the present invention to provide an image forming apparatus comprising: a zoom lens; and an imaging element configured to receive an image formed by the zoom lens.
Compared with the prior art, the zoom lens and the imaging device provided by the invention have the following beneficial effects:
1. through the arrangement of the structure, the influence of the change of the ambient temperature on the zoom lens is reduced as much as possible, the possibility of the deviation of the focal plane of the zoom lens is reduced, the possibility of the image blurring of the zoom lens is reduced, and the imaging quality of the zoom lens is improved.
2. The arrangement of a plurality of aspheric lenses in the second lens group further reduces the possibility of focal plane deviation of the zoom lens in the zooming process, and increases the imaging quality of the zoom lens.
3. The aspheric lens is arranged in the third lens group, so that chromatic aberration and coma aberration of the zoom lens in a telephoto state and a wide-angle state are reduced, and the imaging quality of the zoom lens is improved.
Drawings
The above features, technical features, advantages and implementation manners of a zoom lens and an imaging device will be further described in the following detailed description of preferred embodiments in a clearly understandable manner with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a zoom lens according to the present invention in a telephoto state;
FIG. 2 is a schematic view of a zoom lens according to the present invention;
FIG. 3 is an aberration diagram of a zoom lens in a telephoto state according to the present invention;
FIG. 4 is an aberration diagram of a wide angle state of a zoom lens according to the present invention;
FIG. 5 is a coma diagram illustrating a telephoto state of the zoom lens according to the present invention;
FIG. 6 is a coma diagram illustrating a wide angle state of a zoom lens according to the present invention;
FIG. 7 is a schematic structural diagram of a zoom lens according to another embodiment of the present invention;
FIG. 8 is a schematic view of a zoom lens according to another embodiment of the present invention;
FIG. 9 is an aberration diagram of a telephoto state of another zoom lens of the present invention;
FIG. 10 is an aberration diagram of a wide angle state of another zoom lens of the present invention;
FIG. 11 is a coma diagram illustrating a telephoto state of another zoom lens according to the present invention;
fig. 12 is a coma diagram of a wide angle state of another zoom lens of the present invention.
The reference numbers illustrate: g1, a first lens group; g2, a second lens group; g3, a third lens group; g4, a fourth lens group; g5, a fifth lens group; g6, auxiliary components; l1, a first lens; l2, a second lens; l3, a third lens; l4, a fourth lens; l5, a fifth lens; l6, a sixth lens; l7, seventh lens; l8, eighth lens; l9, ninth lens; l10, tenth lens; l11, eleventh lens; l12, twelfth lens; l13, thirteenth lens; l14, fourteenth lens; STO, stop; CG. And (4) protecting the glass.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For the sake of simplicity, only the parts relevant to the invention are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
Example 1
A zoom lens comprising, in order from an object plane side to an image plane side:
the lens comprises a first lens group G1 with positive focal power, a second lens group G2 with negative focal power, a third lens group G3 with positive focal power, a fourth lens group G4 with negative focal power and a fifth lens group G5 with positive focal power.
The zoom lens at least comprises four aspheric lenses;
the zoom lens satisfies the following conditional expression:
1.5＜FNO＜4；
15＜ft/fw＜20；
wherein fno is the f-number of the zoom lens, ft is the focal length of the telephoto end of the zoom lens, and fw is the focal length of the wide-angle end of the zoom lens.
In the embodiment, by the arrangement of the structure, the influence of the change of the ambient temperature on the zoom lens is reduced as much as possible, so that the possibility of the deviation of the focal plane of the zoom lens is reduced, the possibility of the image blurring of the zoom lens is reduced, and the imaging quality of the zoom lens is improved.
The second lens group G2 includes at least two aspheric lenses.
Through the arrangement of a plurality of aspheric lenses in the second lens group G2, the possibility of focal plane deviation of the zoom lens in the zooming process is further reduced, and the imaging quality of the zoom lens is improved.
The fourth lens group G4 includes at least one aspheric lens.
By means of the arrangement of the aspheric lens in the fourth lens group G4, the possibility of focal plane deviation of the zoom lens in the focusing process is reduced, and the imaging quality of the zoom lens is improved.
The first lens group G1, the third lens group G3, and the fifth lens group G5 include at most two aspheric lenses.
By setting a small number of aspheric lenses in the fixed lens group, the cost of the zoom lens is reduced, the chromatic aberration and the coma aberration of the zoom lens are reduced, and the imaging quality of the zoom lens is improved.
The third lens group G3 includes at least one aspheric lens.
The aspheric lens is arranged in the third lens group G3, so that chromatic aberration and coma aberration of the zoom lens in a telephoto state and a wide-angle state are reduced, and the imaging quality of the zoom lens is improved.
The aspherical lens in the third lens group G3 is provided at one end close to the object surface side.
By the arrangement of the structure, the chromatic aberration and the coma aberration of the rays in the rear group of the zoom lens are reduced, and the imaging quality of the zoom lens is improved.
The first lens group G1 includes, in order from the object plane side to the image plane side:
a first lens L1 with negative focal power, a second lens L2 with positive focal power, a third lens L3 with positive focal power and a fourth lens L4 with positive focal power.
The second lens group G2 includes, in order from the object plane side to the image plane side:
a fifth lens L5 of negative power, a sixth lens L6 of negative power, a seventh lens L7 of positive power, and an eighth lens L8 of negative power.
The third lens group G3 includes, in order from the object plane side to the image plane side:
a ninth lens L9 of positive refractive power, a tenth lens L10 of positive refractive power, an eleventh lens L11 of negative refractive power, and a twelfth lens L12 of positive refractive power.
The fourth lens group G4 is a thirteenth lens L13 with negative focal power;
and/or
The fifth lens group G5 is a fourteenth lens L14 having a positive refractive power.
The zoom lens satisfies the following conditional expression:
0.15＜S4/S2＜0.25；
wherein S4 is a maximum moving distance of the fourth lens group G4, and S2 is a moving distance of the second lens group G2.
Through the parameter limitation, on the basis that the fourth lens group G4 can realize focusing, the moving distance of the fourth lens group G4 is reduced, and then the zoom lens is miniaturized.
When the zoom lens is changed from the wide-angle state to the telephoto state or from the telephoto state to the wide-angle state, the fourth lens group moves to the image plane side and then moves to the object plane side.
In this embodiment, through the arrangement of the above structure, the aberration and coma in the wide angle state and the telephoto state of the zoom lens are reduced, and the imaging quality of the zoom lens is improved.
The zoom lens satisfies the following conditional expression:
0.3＜BFL/DG1＜0.4；
the BFL is an optical back focus of the zoom lens, and the DG1 is an optical total length of the first lens group G1.
Through the limitation of the parameters, the possibility of overlarge or undersize of the optical back focus of the zoom lens is reduced, the zoom lens is miniaturized, and meanwhile, the zoom lens has higher imaging quality.
The zoom lens satisfies the following conditional expression:
-1.05＜f7/f8＜-0.95；
wherein f7 is a focal length of the seventh lens L7, and f8 is a focal length of the eighth lens L8.
Temperature drift compensation of the seventh lens L7 and the eighth lens L8 is achieved through the definition of focal lengths of the seventh lens L7 and the eighth lens L8, and due to the fact that the signs of the optical powers of the seventh lens L7 and the eighth lens L8 are opposite.
Example 2
A zoom lens comprising, in order from an object plane side to an image plane side:
a first lens group G1 with positive focal power, a second lens group G2 with negative focal power, a diaphragm STO, a third lens group G3 with positive focal power, a fourth lens group G4 with negative focal power, a fifth lens group G5 with positive focal power and an auxiliary component G6.
The first lens group G1 includes, in order from the object plane side to the image plane side:
a first lens L1 with negative focal power, a second lens L2 with positive focal power, a third lens L3 with positive focal power and a fourth lens L4 with positive focal power.
The second lens group G2 includes, in order from the object plane side to the image plane side:
a fifth lens L5 with negative power, a sixth lens L6 with negative power, a seventh lens L7 with positive power, and an eighth lens L8 with negative power.
The third lens group G3 includes, in order from the object plane side to the image plane side:
a ninth lens L9 of positive power, a tenth lens L10 of positive power, an eleventh lens L11 of negative power, and a twelfth lens L12 of positive power.
The fourth lens group G4 is a thirteenth lens L13 with negative refractive power.
The fifth lens group G5 is a fourteenth lens L14 with positive refractive power.
The auxiliary component G6 is a piece of cover glass CG.
Table 1 shows basic lens data of the zoom lens of the present embodiment, table 2 shows variable parameters in table 1, and table 3 shows aspherical surface coefficients.
The plane number column indicates the plane number when the number is increased one by one toward the image side with the plane on the object side being the 1 st plane; the surface type column shows the surface type of a certain lens; the radius of curvature of a lens is shown in the column of radius of curvature, positive radius of curvature indicates that the surface is curved in the object side direction, and negative radius of curvature indicates that the surface is curved in the image side direction; the surface spacing on the optical axis of each surface from the surface adjacent to its image side is shown in the center thickness column; the refractive index of a certain lens is shown in the refractive index column; the abbe number of a certain lens is shown in the abbe number column.
In table 2, the WIDE column indicates specific numerical values of the respective variable parameters when the zoom lens is in the WIDE-angle end state, and the TELE column indicates specific numerical values of the respective variable parameters when the zoom lens is in the telephoto end state.
In Table 3, K is the conic coefficient and e is the scientific count number, e.g., e-005 means 10-5.
[ TABLE 1 ]
Figure BDA0003065507390000091
Figure BDA0003065507390000101
[ TABLE 2 ]
WIDE MID TELE
D1 0.60 22.93 28.74
D2 29.88 7.55 1.74
D3 0.7 7.18 1.07
D4 11.04 4.56 10.67
[ TABLE 3 ]
Figure BDA0003065507390000102
Figure BDA0003065507390000111
In this example, FNO =1.6-3.8, fw =5.5mm, ft =108mm, ft/fw =19.64, ttl =86.91mm;
wherein fno is the f-number of the zoom lens, ft is the focal length of the telephoto end of the zoom lens, fw is the focal length of the wide-angle end of the zoom lens, and TTL is the total optical length of the zoom lens.
S2＝28.14mm，S4＝6.48mm，S4/S2＝0.23；
Wherein S4 is a moving distance of the fourth lens group G4, and S2 is a moving distance of the second lens group G2.
BFL＝4.5mm，DG1＝13.83mm，BFL/DG1＝0.325；
The BFL is an optical back focus of the zoom lens, and the DG1 is an optical total length of the first lens group G1.
f7＝9.60mm，f8＝-9.49mm，f7/f8＝-1.01；
Wherein f7 is a focal length of the seventh lens L7, and f8 is a focal length of the eighth lens L8.
Example 3
A zoom lens comprising, in order from an object plane side to an image plane side:
a first lens group G1 with positive focal power, a second lens group G2 with negative focal power, a diaphragm STO, a third lens group G3 with positive focal power, a fourth lens group G4 with negative focal power, a fifth lens group G5 with positive focal power and an auxiliary component G6.
The first lens group G1 includes, in order from the object plane side to the image plane side:
a first lens L1 with negative focal power, a second lens L2 with positive focal power, a third lens L3 with positive focal power and a fourth lens L4 with positive focal power.
The second lens group G2 includes, in order from the object plane side to the image plane side:
a fifth lens L5 of negative power, a sixth lens L6 of negative power, a seventh lens L7 of positive power, and an eighth lens L8 of negative power.
The third lens group G3 includes, in order from the object plane side to the image plane side:
a ninth lens L9 of positive refractive power, a tenth lens L10 of positive refractive power, an eleventh lens L11 of negative refractive power, and a twelfth lens L12 of positive refractive power.
The fourth lens group G4 is a thirteenth lens L13 with negative refractive power.
The fifth lens group G5 is a fourteenth lens L14 with positive refractive power.
The auxiliary component G6 is a piece of cover glass CG.
Table 4 shows basic lens data of the zoom lens of the present embodiment, table 5 shows variable parameters in table 4, and table 6 shows aspherical surface coefficients.
The plane number column indicates the plane number when the number is increased one by one toward the image side with the plane on the object side being the 1 st plane; the surface type column shows the surface type of a certain lens; the radius of curvature of a lens is shown in the column of radius of curvature, positive radius of curvature indicates that the surface is curved in the object side direction, and negative radius of curvature indicates that the surface is curved in the image side direction; the surface spacing on the optical axis of each surface from the surface adjacent to its image side is shown in the center thickness column; the refractive index of a certain lens is shown in the refractive index column; the abbe number of a certain lens is shown in the abbe number column.
In table 5, the WIDE column indicates specific numerical values of the respective variable parameters when the zoom lens is in the WIDE-angle end state, and the TELE column indicates specific numerical values of the respective variable parameters when the zoom lens is in the telephoto end state.
In Table 6, K is the conic coefficient and e is the scientific count number, e.g., e-005 means 10-5.
[ TABLE 4 ]
Figure BDA0003065507390000121
Figure BDA0003065507390000131
[ TABLE 5 ]
WIDE MID TELE
D1 0.60 24.97 31.54
D2 32.67 8.30 1.73
D3 0.70 6.89 1.38
D4 9.07 2.88 8.39
[ TABLE 6 ]
Figure BDA0003065507390000141
In this example, FNO =1.6-3.8, fw =5.5mm, ft =108mm, ft/fw =19.64, ttl =86.9mm;
wherein fno is the f-number of the zoom lens, ft is the focal length of the telephoto end of the zoom lens, fw is the focal length of the wide-angle end of the zoom lens, and TTL is the total optical length of the zoom lens.
S2＝30.94mm，S4＝6.19mm，S4/S2＝0.2；
Wherein S4 is a moving distance of the fourth lens group G4, and S2 is a moving distance of the second lens group G2.
BFL＝4.66mm，DG1＝13.56mm，BFL/DG1＝0.344；
The BFL is an optical back focus of the zoom lens, and the DG1 is an optical total length of the first lens group G1.
f7＝9.91mm，f8＝-9.95mm，f7/f8＝-0.99；
Wherein f7 is a focal length of the seventh lens L7, and f8 is a focal length of the eighth lens L8.
Example 4
An image forming apparatus, as shown in fig. 1 to 12, comprising: the zoom lens described in any one of the above embodiments, and the imaging element, are configured to receive an image formed by the zoom lens.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (12)

1. A zoom lens, comprising, in order from an object plane side to an image plane side:
the lens comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with negative focal power and a fifth lens group with positive focal power;
the second lens group includes, in order from the object plane side to the image plane side:
the fifth lens with negative focal power, the sixth lens with negative focal power, the seventh lens with positive focal power and the eighth lens with negative focal power;
the third lens group includes, in order from the object plane side to the image plane side:
a ninth lens with positive focal power, a tenth lens with positive focal power, an eleventh lens with negative focal power, and a twelfth lens with positive focal power;
the fourth lens group is a thirteenth lens with negative focal power;
the fifth lens group is a fourteenth lens with positive focal power;
the zoom lens at least comprises four aspheric lenses;
the zoom lens satisfies the following conditional expression:
1.5＜FNO＜4；
15＜ft/fw＜20；
wherein fno is the f-number of the zoom lens, ft is the focal length of the telephoto end of the zoom lens, and fw is the focal length of the wide-angle end of the zoom lens.
2. The zoom lens according to claim 1, wherein:
the second lens group at least comprises two aspheric lenses.
3. A zoom lens according to claim 1, wherein:
the fourth lens group at least comprises an aspheric lens.
4. A zoom lens according to claim 1, wherein:
the first lens group, the third lens group and the fifth lens group comprise at most two aspheric lenses.
5. A zoom lens according to claim 1, wherein:
the third lens group at least comprises an aspheric lens.
6. A zoom lens according to claim 5, wherein:
the aspherical lens in the third lens group is provided at one end close to the object surface side.
7. A zoom lens according to claim 1, wherein:
the first lens group includes, in order from an object plane side to an image plane side:
the lens comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power and a fourth lens with positive focal power.
8. The zoom lens according to claim 1, wherein:
the zoom lens satisfies the following conditional expression:
0.15＜S4/S2＜0.25；
wherein S4 is a maximum moving distance of the fourth lens group, and S2 is a moving distance of the second lens group.
9. A zoom lens according to claim 8, wherein:
when the zoom lens is changed from the wide-angle state to the telephoto state or from the telephoto state to the wide-angle state, the fourth lens group moves to the image plane side and then moves to the object plane side.
10. The zoom lens according to claim 1, wherein:
the zoom lens satisfies the following conditional expression:
0.3＜BFL/DG1＜0.4；
BFL is the optical back focus of the zoom lens, and DG1 is the optical total length of the first lens group.
11. The zoom lens according to claim 1, wherein:
the zoom lens satisfies the following conditional expression:
-1.05＜f7/f8＜-0.95；
wherein f7 is a focal length of the seventh lens, and f8 is a focal length of the eighth lens.
12. An image forming apparatus comprising:
a zoom lens according to any one of claims 1 to 11;
and an imaging element configured to receive an image formed by the zoom lens.
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