CN113589505B - Zoom lens and imaging device - Google Patents

Zoom lens and imaging device Download PDF

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Publication number
CN113589505B
CN113589505B CN202110889368.8A CN202110889368A CN113589505B CN 113589505 B CN113589505 B CN 113589505B CN 202110889368 A CN202110889368 A CN 202110889368A CN 113589505 B CN113589505 B CN 113589505B
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lens
zoom lens
lens group
focal power
zoom
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CN113589505A (en
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袁多
万彦男
周洁
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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
    • 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
    • G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group

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

Abstract

The invention relates to the field of optics, in particular to a zoom lens and an imaging device, wherein the zoom lens sequentially comprises the following components 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 diaphragm, 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 and the fourth lens group move along a main optical axis of the zoom lens; 10 < ft/fw < 15; FNO is more than 1.5 and less than 3.5; ft is the focus of zoom lens telescope state, fw is the focus of zoom lens wide angle state, FNO is the f-number of zoom lens. The zoom lens has smaller f-number under the condition of medium-magnification zooming, the volume of the zoom lens is reduced, the chromatic aberration and the coma aberration of the edge position of the zoom lens are increased, and the imaging quality of the zoom lens is improved.

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
With the continuous and deep research in the imaging optics field, the demand of on-line office meetings is increasing, and with the improvement of the market demand at home and abroad, the improvement of the video conference lens on the requirement of the lens multiplying power is particularly obvious.
In a newly emerging video conference lens, under the condition of not changing the shooting object distance, the large-magnification zoom lens can realize the zooming process of dozens of times of the focal length on a single lens, and the change of the focal length causes the change of the field angle under the same target surface, so that the change of the size of an imaging picture is obtained.
At the wide angle end, the zoom lens can shoot a relatively wide-angle picture to acquire more environmental information, and when some parts of the picture need to be magnified and observed, the zoom lens can be adjusted to the telephoto end to acquire detailed information.
At present, in the zooming process of the existing zoom lens, because the moving distance of a moving group is large, the volume of the zoom lens is increased, the chromatic aberration and the coma aberration of the edge position of the zoom lens are low, 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, so that the zoom lens has smaller number of turns in a medium-magnification zooming state, the change degree of the number of turns of the zoom lens is reduced, the moving distance of a moving group in the zoom lens is reduced, the volume of the zoom lens is reduced, the chromatic aberration and the coma aberration of the edge position of the zoom lens are increased, and the imaging quality of the zoom lens is improved.
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 diaphragm, 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 and the fourth lens group move along a main optical axis of the zoom lens;
10＜ft/fw＜15；
1.5＜FNO＜3.5；
ft is the focus of zoom lens telescope state, fw is the focus of zoom lens wide angle state, FNO is the f-number of zoom lens.
In the technical scheme, by limiting the parameters, the zoom lens has smaller f-number in a medium-magnification zooming state of the zoom lens, the change degree of the f-number of the zoom lens is reduced, the moving distance of a moving group in the zoom lens is reduced, the volume of the zoom lens is reduced, the chromatic aberration and the coma aberration of the edge position of the zoom lens are increased, 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 optical lens comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power and a fifth lens with positive focal power, wherein the second lens and the third lens are glued.
Preferably, the second lens group includes, in order from the object plane side to the image plane side:
a sixth lens with negative focal power, a seventh lens with negative focal power, an eighth lens with positive focal power and a ninth lens with negative focal power.
Preferably, the number of lenses of the fifth lens group is smaller than the number of lenses of the third lens group.
In the technical scheme, the reasonable distribution of the focal power of the lens groups in the zoom lens is realized by limiting the number of the lenses of the third lens group and the fifth lens group, so that the moving distance between the second lens group and the fourth lens group and the total optical length of each lens group are reduced, and the miniaturization of the zoom lens is realized.
Preferably, the third lens group includes, in order from the object plane side to the image plane side:
a tenth lens of positive power, an eleventh lens of positive power, a twelfth lens of negative power, and a thirteenth lens of positive power.
Preferably, the fifth lens group includes, in order from the object plane side to the image plane side:
a fifteenth lens of positive power and a sixteenth lens of positive power.
Preferably, both side curved surfaces of the sixteenth lens are curved toward the object plane side.
In the technical scheme, the distance of the image height on the sensor is reduced by limiting the direction of the curved surface of the last lens, so that the size of the sensor required to be matched is reduced, and the miniaturization of the zoom lens is further realized.
Preferably, the sixteenth lens satisfies the following conditional expression:
|(R161+R162)/(R161-R162)|＜2；
where R161 is a radius of curvature of the object-side curved surface of the sixteenth lens, and R162 is a radius of curvature of the image-side curved surface of the sixteenth lens.
In the technical scheme, the limitation of the curvature radius of the curved surfaces at the two sides of the sixteenth lens reduces the possibility that the focal power of the sixteenth lens is too large or too small, and simultaneously can reduce the chromatic aberration and the aberration of the zoom lens and increase the imaging quality of the zoom lens.
Preferably, at most one aspheric lens is present in the first lens group, the third lens group, and the fifth lens group.
In the technical scheme, by arranging the aspheric lens, the using number of the spherical lenses in the zoom lens is reduced, the structure of the zoom lens is simplified, and the miniaturization of the zoom lens is realized.
Preferably, the aspherical lens is provided at one end of the third lens group on the object plane side.
In the technical scheme, by limiting the position of the aspheric lens, the chromatic aberration and the aberration of the light rays at the rear part of the diaphragm of the zoom lens can be further optimized while the miniaturized zoom lens is realized, and the imaging quality of the zoom lens is improved.
Preferably, the zoom lens satisfies the following conditional expression:
0.25＜S4/S2＜0.7；
wherein S4 is a moving distance of the fourth lens group, and S2 is a moving distance of the second lens group.
In the technical scheme, the moving distance of the second lens group and the fourth lens group is limited, so that the setting of the focal power of each lens group is facilitated, the moving distance of the second lens group and the fourth lens group is reduced, and the miniaturization of the zoom lens is realized.
Preferably, the zoom lens satisfies the following conditional expression:
TTL＜100mm；
ΦG1/TTL＞0.35；
wherein, TTL is the total optical length of the zoom lens, and Φ G1 is the outer diameter of the first lens group.
In the technical scheme, by limiting the parameters, the outer diameter of the first lens group is increased under the condition that the volume of the zoom lens is smaller, so that the field angle of the zoom lens is increased, and the imaging quality of the zoom lens is improved.
Preferably, at least one aspheric lens is disposed in the second lens group;
and/or
At least one aspheric lens is arranged in the fourth lens group.
In the technical scheme, by arranging the aspheric lens, the using number of the spherical lenses in the zoom lens is reduced, the structure of the zoom lens is simplified, and the miniaturization of the zoom lens is realized.
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. by limiting the parameters, the zoom lens has smaller f-number under the condition of medium-magnification zooming of the zoom lens, and simultaneously the change degree of the f-number of the zoom lens is reduced, so that the moving distance of a moving group in the zoom lens is reduced, the volume of the zoom lens is reduced, the chromatic aberration and the coma aberration of the edge position of the zoom lens are increased, and the imaging quality of the zoom lens is improved;
2. the limitation of the curvature radius of the curved surfaces on the two sides of the sixteenth lens reduces the possibility that the focal power of the sixteenth lens is too large or too small, and simultaneously can reduce the chromatic aberration and aberration of the zoom lens and increase the imaging quality of the zoom lens;
3. through the arrangement of the aspheric lens, the using number of the spherical lenses in the zoom lens is reduced, the structure of the zoom lens is simplified, and the miniaturization of the zoom lens is realized.
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 view of a zoom lens according to the present invention;
FIG. 2 is an aberration diagram of a zoom lens according to the present invention in a telephoto state;
FIG. 3 is an aberration diagram of a wide angle state of a zoom lens according to the present invention;
FIG. 4 is a coma diagram I of a zoom lens in a telephoto state according to the present invention;
FIG. 5 is a second coma aberration diagram of the zoom lens in the telephoto state according to the present invention;
FIG. 6 is a coma diagram I of a wide angle state of a zoom lens according to the present invention;
FIG. 7 is a second coma diagram illustrating a wide angle state of a zoom lens according to the present invention;
FIG. 8 is a schematic structural diagram of another zoom lens system according to the present invention;
FIG. 9 is an aberration diagram of a telephoto state of the 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 I of the telephoto state of the zoom lens according to another embodiment of the present invention;
FIG. 12 is a second coma chart showing the telephoto state of the zoom lens according to another embodiment of the present invention;
FIG. 13 is a coma diagram I of a wide angle state of another zoom lens according to the present invention;
fig. 14 is a coma aberration diagram ii 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, first lens; l2, second lens; l3, third lens; l4, fourth lens; l5, fifth lens; l6, 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; l15, fifteenth lens; l16, sixteenth 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to 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:
a first lens group G1 of positive power, a second lens group G2 of negative power, a diaphragm STO, a third lens group G3 of positive power, a fourth lens group G4 of negative power, and a fifth lens group G5 of positive power;
the second lens group G2 and the fourth lens group G4 move along the main optical axis of the zoom lens;
10＜ft/fw＜15；
1.5＜FNO＜3.5；
ft is the focus of zoom lens telescope state, fw is the focus of zoom lens wide angle state, FNO is the f-number of zoom lens.
In the embodiment, by limiting the parameters, the zoom lens has a smaller f-number in a medium-magnification zooming state of the zoom lens, and the change degree of the f-number of the zoom lens is reduced, so that the moving distance of the moving group in the zoom lens is reduced, the size of the zoom lens is reduced, the chromatic aberration and the coma aberration of the edge position of the zoom lens are increased, 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 of negative power, a second lens L2 of negative power, a third lens L3 of positive power, a fourth lens L4 of positive power and a fifth lens L5 of positive power, wherein the second lens L2 and the third lens L3 are cemented.
The second lens group G2 includes, in order from the object plane side to the image plane side:
a sixth lens L6 of negative power, a seventh lens L7 of negative power, an eighth lens L8 of positive power, and a ninth lens L9 of negative power.
The number of lenses of the fifth lens group G5 is smaller than that of the third lens group G3.
Through the limitation of the number of the lenses of the third lens group G3 and the fifth lens group G5, the reasonable distribution of the powers of the lens groups in the zoom lens is realized, the moving distance between the second lens group G2 and the fourth lens group G4 is reduced, the total optical length of each lens group is reduced, and the miniaturization of the zoom lens is realized.
The third lens group G3 includes, in order from the object plane side to the image plane side:
a tenth lens L10 of positive power, an eleventh lens L11 of positive power, a twelfth lens L12 of negative power, and a thirteenth lens L13 of positive power.
The fifth lens group G5 includes, in order from the object plane side to the image plane side:
a fifteenth lens of positive power L15 and a sixteenth lens of positive power L16.
Both side curved surfaces of the sixteenth lens L16 are curved toward the object plane side.
The distance of the image height on the sensor is reduced through the limitation of the direction of the curved surface of the last lens, so that the size of the sensor required to be matched is reduced, and the miniaturization of the zoom lens is further realized.
The sixteenth lens L16 satisfies the following conditional expression:
|(R161+R162)/(R161-R162)|＜2；
where R161 is a radius of curvature of the object-side curved surface of the sixteenth lens L16, and R162 is a radius of curvature of the image-side curved surface of the sixteenth lens L16.
The limitation of the curvature radius of the curved surfaces at two sides of the sixteenth lens L16 reduces the possibility that the focal power of the sixteenth lens L16 is too large or too small, and simultaneously can reduce the chromatic aberration and aberration of the zoom lens and increase the imaging quality of the zoom lens.
At most one aspheric lens exists in the first lens group G1, the third lens group G3, and the fifth lens group G5.
Through the arrangement of the aspheric lens, the using number of the spherical lenses in the zoom lens is reduced, the structure of the zoom lens is simplified, and the miniaturization of the zoom lens is realized.
The aspherical lens is provided at one end of the third lens group G3 on the object plane side.
By limiting the position of the aspheric lens, the chromatic aberration and the aberration of the light rays at the rear part of the stop STO of the zoom lens can be further optimized while the miniaturized zoom lens is realized, and the imaging quality of the zoom lens is improved.
The zoom lens satisfies the following conditional expression:
0.25＜S4/S2＜0.7；
wherein S4 is a moving distance of the fourth lens group G4, and S2 is a moving distance of the second lens group G2.
In the present embodiment, the distance of movement of the second lens group G2 and the fourth lens group G4 is defined, so that the setting of the power of each lens group is facilitated, the distance of movement of the second lens group G2 and the fourth lens group G4 is reduced, and the zoom lens is miniaturized.
The zoom lens satisfies the following conditional expression:
TTL＜100mm；
ΦG1/TTL＞0.35；
wherein TTL is the total optical length of the zoom lens, and Φ G1 is the outer diameter of the first lens group G1.
Through the definition of the above parameters, in the case that the zoom lens is small in size, the outer diameter of the first lens group G1 is increased, and then the angle of view of the zoom lens is increased, thereby achieving the improvement of the imaging quality of the zoom lens.
At least one aspheric lens is arranged in the second lens group G2;
and/or
At least one aspheric lens is disposed in the fourth lens group G4.
Through the arrangement of the aspheric lens, the using number of the spherical lenses in the zoom lens is reduced, the structure of the zoom lens is simplified, and the miniaturization of the zoom lens is realized.
Example 2
A zoom lens comprising, in order from an object plane side to an image plane side:
a first lens group G1 of positive power, a second lens group G2 of negative power, a diaphragm STO, a third lens group G3 of positive power, a fourth lens group G4 of negative power, a fifth lens group G5 of positive 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 of negative power, a second lens L2 of negative power, a third lens L3 of positive power, a fourth lens L4 of positive power and a fifth lens L5 of positive power, wherein the second lens L2 and the third lens L3 are cemented.
The second lens group G2 includes, in order from the object plane side to the image plane side:
a sixth lens L6 of negative power, a seventh lens L7 of negative power, an eighth lens L8 of positive power, and a ninth lens L9 of negative power.
The third lens group G3 includes, in order from the object plane side to the image plane side:
a tenth lens L10 of positive power, an eleventh lens L11 of positive power, a twelfth lens L12 of negative power, and a thirteenth lens L13 of positive power.
The fourth lens group G4 is a fourteenth lens L14 with negative refractive power.
The fifth lens group G5 includes, in order from the object plane side to the image plane side:
a fifteenth lens of positive power L15 and a sixteenth lens of positive power L16.
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 GDA0003694884430000101
Figure GDA0003694884430000111
[ TABLE 2 ]
WIDE TELE
D1 0.50 27.03
D2 27.63 1.10
D3 0.60 17.17
D4 17.33 0.76
[ TABLE 3 ]
Figure GDA0003694884430000112
In this embodiment, ft is 57.5mm, fw is 3.96mm, ft/fw is 14.52, FNO is 1.8-3, TTL is 94.87 mm;
ft is the focal length of the zoom lens in the telescopic state, fw is the focal length of the zoom lens in the wide-angle state, and FNO is the f-number of the zoom lens.
R161＝10.6mm，R162＝34.05mm；
|(R161+R162)/(R161-R162)|＝1.9；
Wherein R161 is a radius of curvature of the object-surface-side curved surface of the sixteenth lens L16, and R162 is a radius of curvature of the image-surface-side curved surface of the sixteenth lens L16.
S4＝16.57mm，S2＝26.53mm；
S4/S2＝0.62；
Wherein S4 is a moving distance of the fourth lens group G4, and S2 is a moving distance of the second lens group G2.
HFOVw＞72.5°；
HFOVt＞5.4°；
The HFOVw is an angle of view of the zoom lens in a wide angle state, and the HFOVt is an angle of view of the zoom lens in a telephoto state.
ΦG1＝37.65mm，ΦG1/TTL＝0.397；
Wherein Φ G1 is an outer diameter of the first lens group G1.
Example 3
A zoom lens comprising, in order from an object plane side to an image plane side:
a first lens group G1 of positive power, a second lens group G2 of negative power, a diaphragm STO, a third lens group G3 of positive power, a fourth lens group G4 of negative power, a fifth lens group G5 of positive 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 of negative power, a second lens L2 of negative power, a third lens L3 of positive power, a fourth lens L4 of positive power and a fifth lens L5 of positive power, wherein the second lens L2 and the third lens L3 are cemented.
The second lens group G2 includes, in order from the object plane side to the image plane side:
a sixth lens L6 of negative power, a seventh lens L7 of negative power, an eighth lens L8 of positive power, and a ninth lens L9 of negative power.
The third lens group G3 includes, in order from the object plane side to the image plane side:
a tenth lens L10 of positive power, an eleventh lens L11 of positive power, a twelfth lens L12 of negative power, and a thirteenth lens L13 of positive power.
The fourth lens group G4 is a fourteenth lens L14 with negative refractive power.
The fifth lens group G5 includes, in order from the object plane side to the image plane side:
a fifteenth lens L15 of positive power and a sixteenth lens L16 of positive 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 certain lens is shown in the column of the radius of curvature, and when the radius of curvature is positive, the surface is curved toward the object side, and when the radius of curvature is negative, the surface is curved toward the image side; 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 GDA0003694884430000131
Figure GDA0003694884430000141
[ TABLE 5 ]
Figure GDA0003694884430000142
Figure GDA0003694884430000151
[ TABLE 6 ]
Figure GDA0003694884430000152
In this embodiment, ft is 57.5mm, fw is 3.98mm, ft/fw is 14.45, FNO is 2-3.1, and TTL is 86.4 mm;
ft is the focus of zoom lens telescope state, fw is the focus of zoom lens wide angle state, FNO is the f-number of zoom lens.
R161＝10.82mm，R162＝∞；
|(R161+R162)/(R161-R162)|＝1；
Wherein R161 is a radius of curvature of the object-surface-side curved surface of the sixteenth lens L16, and R162 is a radius of curvature of the image-surface-side curved surface of the sixteenth lens L16.
S4＝8.05mm，S2＝26.56mm；
S4/S2＝0.3；
Wherein S4 is a moving distance of the fourth lens group G4, and S2 is a moving distance of the second lens group G2.
HFOVw＞72.5°；
HFOVt＞5.4°；
The HFOVw is the angle of view of the zoom lens in the wide angle state, and the HFOVt is the angle of view of the zoom lens in the telephoto state.
ΦG1＝33.7mm，ΦG1/TTL＝0.39；
Wherein Φ G1 is an outer diameter of the first lens group G1.
Example 4
An image forming apparatus, as shown in fig. 1 to 14, 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 amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.

Claims (10)

1. The zoom lens is characterized by comprising a first lens group with positive focal power, a second lens group with negative focal power, a diaphragm, 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 in sequence from an object plane side to an image plane side;
the second lens group and the fourth lens group move along a main optical axis of the zoom lens;
the first lens group consists of a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power and a fifth lens with positive focal power in sequence from the object plane side to the image plane side, wherein the second lens and the third lens are cemented;
the second lens group consists of a sixth lens with negative focal power, a seventh lens with negative focal power, an eighth lens with positive focal power and a ninth lens with negative focal power in sequence from the object plane side to the image plane side;
the third lens group consists of a tenth lens with positive focal power, an eleventh lens with positive focal power, a twelfth lens with negative focal power and a thirteenth lens with positive focal power in sequence from the object plane side to the image plane side;
the fourth lens group is a fourteenth lens with negative focal power;
the fifth lens group consists of a fifteenth lens with positive focal power and a sixteenth lens with positive focal power in sequence from the object plane side to the image plane side;
10＜ft/fw＜15；
1.5＜FNO＜3.5；
ft is the focus of zoom lens telescope state, fw is the focus of zoom lens wide angle state, FNO is the f-number of zoom lens.
2. A zoom lens according to claim 1, wherein:
the number of lenses of the fifth lens group is smaller than the number of lenses of the third lens group.
3. A zoom lens according to claim 1, wherein:
and the curved surfaces on the two sides of the sixteenth lens are both bent towards the object plane side.
4. A zoom lens according to claim 1, wherein:
the sixteenth lens satisfies the following conditional expression:
|(R161+R162)/(R161-R162)|＜2；
where R161 is a radius of curvature of the object-side curved surface of the sixteenth lens element, and R162 is a radius of curvature of the image-side curved surface of the sixteenth lens element.
5. A zoom lens according to claim 1, wherein:
at most one aspheric lens is present in the first lens group, the third lens group, and the fifth lens group.
6. A zoom lens according to claim 5, wherein:
the aspheric lens is disposed at one end of the third lens group close to the object plane side.
7. A zoom lens according to claim 1, wherein:
the zoom lens satisfies the following conditional expression:
0.25＜S4/S2＜0.7；
wherein S4 is a moving distance of the fourth lens group, and S2 is a moving distance of the second lens group.
8. A zoom lens according to claim 1, wherein:
the zoom lens satisfies the following conditional expression:
TTL＜100mm；
ΦG1/TTL＞0.35；
wherein, TTL is the total optical length of the zoom lens, and Φ G1 is the outer diameter of the first lens group.
9. The zoom lens according to claim 1, wherein:
at least one aspheric lens is arranged in the second lens group;
and/or
At least one aspheric lens is arranged in the fourth lens group.
10. An image forming apparatus comprising:
a zoom lens according to any one of claims 1 to 9;
and an imaging element configured to receive an image formed by the zoom lens.
CN202110889368.8A 2021-08-04 2021-08-04 Zoom lens and imaging device Active CN113589505B (en)

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CN114815194B (en) * 2022-04-22 2024-03-29 嘉兴中润光学科技股份有限公司 Zoom lens and imaging device
CN114994886A (en) * 2022-06-27 2022-09-02 嘉兴中润光学科技股份有限公司 Large wide-angle zoom lens and imaging device
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JPH09230234A (en) * 1996-02-27 1997-09-05 Canon Inc Zoom lens provided with vibration-proof function
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JP4790820B2 (en) * 2009-01-19 2011-10-12 オリンパス株式会社 Zoom lens and imaging device
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CN111965804B (en) * 2020-10-26 2021-04-06 嘉兴中润光学科技股份有限公司 Miniaturized large-wide-angle camera device and zoom lens
CN112230407B (en) * 2020-11-03 2022-06-03 嘉兴中润光学科技股份有限公司 Large wide-angle camera and zoom lens

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