CN117826387A - Zoom lens and imaging device - Google Patents
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Abstract
The invention relates to the field of optics, in particular to a zoom lens and an imaging device. The zoom lens sequentially comprises a first fixed lens group with positive focal power, a variable 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 from the object plane side to the image plane side; the second fixed lens group comprises two groups of cemented lenses; the third fixed lens group at least comprises a lens with positive focal power; the zoom lens satisfies the following conditional expression: ft/fw > 20; TTL < 100mm;2 < fG5/fw < 3. By limiting the focal length of the third fixed lens group and limiting the inner lens, the third fixed lens group can well correct chromatic aberration and aberration of the front group, and imaging quality of the zoom lens is improved.
Description
Technical Field
The invention relates to the field of optics, in particular to a zoom lens and an imaging device.
Background
The zoom lens is a camera lens capable of changing focal length within a certain range so as to obtain images with different sizes and different scenery ranges. The zoom lens can change the photographing range by varying the focal length without changing the photographing distance, and thus is very advantageous for picture composition. Because a zoom lens can play the role of a plurality of fixed focus lenses, the quantity of photographic equipment carried is reduced and the time for changing the lenses is saved when the user travels.
The existing zoom lens is generally large in size in the use process, miniaturization of the zoom lens is an overall trend of the current lens industry, and for the zoom lens with large magnification and miniaturization, the problem of low imaging quality exists in the zoom lens.
Disclosure of Invention
The invention solves the prior technical problems, and provides a zoom lens and an imaging device, which reduce the number of lenses in the zoom lens and the cost of the zoom lens by arranging a plurality of groups of double-cemented lenses, and simultaneously, the zoom lens is miniaturized, and meanwhile, the third fixed lens group can well correct chromatic aberration and aberration of the front group and increase the imaging quality of the zoom lens by limiting the focal length of the third fixed lens group and limiting the inner lens.
The technical scheme provided by the invention is as follows:
a zoom lens, which sequentially comprises a first fixed lens group with positive focal power, a zoom 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 from an object plane side to an image plane side;
the zoom lens group and the focusing lens group move along the main optical axis direction of the zoom lens;
the first fixed lens group consists of a first fixed lens with negative focal power, a second fixed lens with positive focal power, a third fixed lens with positive focal power and a fourth fixed lens with positive focal power in sequence from the object plane side to the image plane side, and the first fixed lens and the second fixed lens are glued;
the zoom lens group comprises a first zoom lens with negative focal power, a second zoom lens with negative focal power, a third zoom lens with positive focal power and a fourth zoom lens with negative focal power in sequence from an object plane side to an image plane side;
the focusing lens group comprises a first focusing lens with positive focal power and a second focusing lens with negative focal power in sequence from the object plane side to the image plane side, and the first focusing lens and the second focusing lens are glued;
the second fixed lens group comprises two groups of cemented lenses;
the third fixed lens group at least comprises a lens with positive focal power;
the zoom lens satisfies the following conditional expression:
ft/fw＞20；
TTL＜100mm；
2＜fG5/fw＜3；
wherein ft is a focal length of the zoom lens in a telephoto state, fw is a focal length of the zoom lens in a wide-angle state, TTL is an optical total length of the zoom lens, and fG5 is a focal length of the third fixed lens group.
In the technical scheme, through the definition of the structure and the parameters, the number of lenses in the zoom lens is reduced by the arrangement of a plurality of groups of double-cemented lenses, the cost of the zoom lens is reduced, the miniaturization of the zoom lens is realized, and meanwhile, through the definition of the focal length of the third fixed lens group and the definition of the inner lens, the chromatic aberration and the aberration of the front group can be well corrected by the third fixed lens group, and the imaging quality of the zoom lens is improved.
Preferably, the second fixed lens group is composed of a fifth fixed lens with positive focal power, a sixth fixed lens with negative focal power, a seventh fixed lens with positive focal power, an eighth fixed lens with negative focal power, and a ninth fixed lens with positive focal power in sequence from the object plane side to the image plane side, the sixth fixed lens and the seventh fixed lens form a double-cemented lens, and the eighth fixed lens and the ninth fixed lens form the double-cemented lens.
Preferably, the third fixed lens group is composed of a tenth fixed lens of negative power and an eleventh fixed lens of positive power in this order from the object plane side to the image plane side, and the tenth fixed lens and the eleventh fixed lens are cemented.
Preferably, the third fixed lens group is composed of a tenth fixed lens of positive power and an eleventh fixed lens of positive power in this order from the object plane side to the image plane side.
Preferably, the zoom lens group and the second fixed lens group are respectively provided with an aspheric lens.
In the technical scheme, the number of lenses in the zoom lens is reduced, so that the quality of the zoom lens is reduced, chromatic aberration and correction of aberration of the zoom lens are facilitated, and the imaging quality of the zoom lens is improved.
Preferably, the zoom lens satisfies the following conditional expression:
0.3＜XG2/TTL＜0.35；
wherein XG2 is the moving distance of the variable magnification lens group.
In the technical scheme, the zoom lens is miniaturized by limiting the moving distance of the zoom lens group, and meanwhile, the effect of large zoom ratio of the zoom lens can be realized.
Preferably, the zoom lens satisfies the following conditional expression:
0.1＜XG4/XG2＜0.2；
wherein XG4 is the moving distance of the focusing lens group.
According to the technical scheme, through the limitation of the parameters, the effect of miniaturization of the zoom lens is achieved, and meanwhile, the imaging quality of the zoom lens is improved.
Preferably, the eleventh fixed lens satisfies the following conditional expression:
0.9＜R112/(R111+R112)＜1.2；
wherein R111 is a radius of curvature of the surface of the eleventh fixed lens near the object plane, and R112 is a radius of curvature of the surface of the eleventh fixed lens near the image plane.
In the technical scheme, through the limitation of the parameters, the curvature radius of the eleventh fixed lens, which is close to the curved surface of the image surface side, is greatly increased, the included angle between the light path and the main optical axis is reduced, the dissipation of the light path on the lens is reduced, and the brightness of the zoom lens is increased.
Preferably, the two groups of cemented lenses in the second fixed lens group each satisfy one of the following conditional expressions:
4＜f1/fw＜8；
30＜f2/fw＜35；
wherein f1 and f2 are focal lengths of the two groups of cemented lenses in the second fixed lens group respectively.
According to the technical scheme, through the limitation of the parameters, the correction of the aberration of the front group by the second fixed lens group is realized, and the imaging quality of the zoom lens is improved.
It is also an object of the present invention to provide an image forming apparatus including: 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 definition of the structure and the parameters, the number of lenses in the zoom lens is reduced by arranging a plurality of groups of double-cemented lenses, the cost of the zoom lens is reduced, the miniaturization of the zoom lens is realized, and meanwhile, through the definition of the focal length of the third fixed lens group and the definition of the inner lenses, the chromatic aberration and the aberration of the front group can be well corrected by the third fixed lens group, and the imaging quality of the zoom lens is improved.
2. The number of lenses in the zoom lens is reduced, so that the quality of the zoom lens is reduced, chromatic aberration and correction of aberration of the zoom lens are facilitated, and the imaging quality of the zoom lens is improved.
3. By limiting the parameters, the curvature radius of the eleventh fixed lens close to the image surface side curved surface is greatly increased, the included angle between the light path and the main optical axis is reduced, the dissipation of the light path on the lens is reduced, and the brightness of the zoom lens is increased.
Drawings
The above features, technical features, advantages and implementation of a zoom lens and an imaging apparatus will be further described in detail below with reference to the accompanying drawings.
FIG. 1 is a schematic view of a zoom lens according to the present invention;
fig. 2 is a coma view of a wide-angle state of a zoom lens according to the present invention;
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 view of a telescopic state of the zoom lens according to the present invention;
FIG. 5 is an aberration diagram of a zoom lens in a telescopic state according to the present invention;
FIG. 6 is a schematic view of another zoom lens according to the present invention;
fig. 7 is a coma view of another wide-angle state of the zoom lens of the present invention;
FIG. 8 is an aberration diagram of another zoom lens of the present invention in a wide-angle state;
fig. 9 is a coma view of a telescopic state of another zoom lens of the present invention;
fig. 10 is an aberration diagram of a telescopic state of another zoom lens according to the present invention.
Reference numerals illustrate: g1, a first fixed lens group; g2, variable magnification lens group; g3, a second fixed lens group; g4, focusing lens group; g5, a third fixed lens group; g6, an auxiliary component; a1, a first fixed lens; a2, a second fixed lens; a3, a third fixed lens; a4, a fourth fixed lens; a5, a fifth fixed lens; a6, a sixth fixed lens; a7, a seventh fixed lens; a8, an eighth fixed lens; a9, a ninth fixed lens; a10, a tenth fixed lens; a11, eleventh fixed lens; b1, a first zoom lens; b2, a second variable magnification lens; b3, a third zoom lens; b4, a fourth variable magnification lens; c1, a first focusing lens; c2, a second focusing lens; d1, a first auxiliary lens; STO and diaphragm; CG. And (3) protecting glass.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For simplicity of the drawing, only the parts relevant to the invention are schematically shown in each drawing, and they do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
Example 1
As shown in fig. 1 and 6, a zoom lens is composed of, in order from an object plane side to an image plane side, a first fixed lens group G1 of positive power, a variable lens group G2 of negative power, a second fixed lens group G3 of positive power, a focusing lens group G4 of negative power, and a third fixed lens group G5 of positive power;
the zoom lens group G2 and the focus lens group G4 move in the main optical axis direction of the zoom lens;
the first fixed lens group G1 is composed of a first fixed lens a1 with negative focal power, a second fixed lens a2 with positive focal power, a third fixed lens a3 with positive focal power and a fourth fixed lens a4 with positive focal power from the object plane side to the image plane side in sequence, and the first fixed lens a1 and the second fixed lens a2 are glued;
the variable magnification lens group G2 sequentially comprises a first variable magnification lens b1 with negative focal power, a second variable magnification lens b2 with negative focal power, a third variable magnification lens b3 with positive focal power and a fourth variable magnification lens b4 with negative focal power from the object plane side to the image plane side;
the focusing lens group G4 comprises a first focusing lens c1 with positive focal power and a second focusing lens c2 with negative focal power in sequence from the object plane side to the image plane side, and the first focusing lens c1 and the second focusing lens c2 are glued;
the second fixed lens group G3 comprises two groups of cemented lenses;
the third fixed lens group G5 includes at least one lens with positive focal power;
the zoom lens satisfies the following conditional expression:
ft/fw＞20；
TTL＜100mm；
2＜fG5/fw＜3；
wherein ft is a focal length of the zoom lens in a telephoto state, fw is a focal length of the zoom lens in a wide-angle state, TTL is an optical total length of the zoom lens, and fG5 is a focal length of the third fixed lens group G5.
In this embodiment, through the above-mentioned structure and parameter limitation, through the setting of multiunit double-cemented lens, reduced the use of the lens quantity in the zoom lens, reduced the cost of zoom lens, realized the miniaturization of zoom lens, simultaneously, through the restriction of third fixed lens group G5 focus, and the restriction of inside lens, make third fixed lens group G5 can carry out good correction to the chromatic aberration and the aberration of front group, increased the imaging quality of zoom lens.
The second fixed lens group G3 is composed of, in order from the object plane side to the image plane side, a fifth fixed lens a5 of positive power, a sixth fixed lens a6 of negative power, a seventh fixed lens a7 of positive power, an eighth fixed lens a8 of negative power, and a ninth fixed lens a9 of positive power, wherein the sixth fixed lens a6 and the seventh fixed lens a7 constitute a doublet lens, and the eighth fixed lens a8 and the ninth fixed lens a9 constitute a doublet lens.
The third fixed lens group G5 is composed of a tenth fixed lens a10 having negative power and an eleventh fixed lens a11 having positive power in this order from the object plane side to the image plane side, and the tenth fixed lens a10 and the eleventh fixed lens a11 are cemented.
The third fixed lens group G5 is composed of a tenth fixed lens a10 having positive power and an eleventh fixed lens a11 having positive power in this order from the object plane side to the image plane side.
And an aspheric lens is arranged in each of the variable magnification lens group G2 and the second fixed lens group G3.
In the embodiment, the number of lenses in the zoom lens is reduced, so that the quality of the zoom lens is reduced, chromatic aberration and correction of aberration of the zoom lens are facilitated, and the imaging quality of the zoom lens is improved.
The zoom lens satisfies the following conditional expression:
0.3＜XG2/TTL＜0.35；
wherein XG2 is a moving distance of the variable magnification lens group G2.
In the present embodiment, by limiting the moving distance of the zoom lens group G2, the effect of downsizing the zoom lens is achieved, and the effect of a large zoom ratio of the zoom lens can also be achieved.
The zoom lens satisfies the following conditional expression:
0.1＜XG4/XG2＜0.2；
wherein XG4 is a moving distance of the focusing lens group G4.
By limiting the parameters, the effect of miniaturization of the zoom lens is achieved, and meanwhile, the imaging quality of the zoom lens is improved.
The eleventh fixed lens a11 satisfies the following conditional expression:
0.9＜R112/(R111+R112)＜1.2；
wherein R111 is a radius of curvature of the eleventh fixed lens a11 near the object-side curved surface, and R112 is a radius of curvature of the eleventh fixed lens a11 near the image-side curved surface.
By limiting the parameters, the curvature radius of the curved surface of the eleventh fixed lens a11 close to the image surface side is greatly increased, the included angle between the light path and the main optical axis is reduced, the dissipation of the light path on the lens is reduced, and the brightness of the zoom lens is increased.
The two groups of cemented lenses in the second fixed lens group G3 each satisfy one of the following conditional expressions:
4＜f1/fw＜8；
30＜f2/fw＜35；
wherein f1 and f2 are focal lengths of the two groups of cemented lenses in the second fixed lens group G3, respectively.
Through the limitation of the parameters, the correction of the aberration of the front group by the second fixed lens group G3 is realized, and the imaging quality of the zoom lens is improved; in this embodiment, the sixth fixed lens a6 and the seventh fixed lens a7 form a cemented lens, and the eighth fixed lens a8 and the ninth fixed lens a9 form a cemented lens, where one cemented lens satisfies the conditional expression of f1 and the other cemented lens satisfies the conditional expression of f 2.
Example 2
As shown in fig. 1 to 5, a zoom lens is composed of, in order from an object plane side to an image plane side, a first fixed lens group G1 of positive power, a variable lens group G2 of negative power, a second fixed lens group G3 of positive power, a focusing lens group G4 of negative power, a third fixed lens group G5 of positive power, and an auxiliary component G6;
the zoom lens group G2 and the focus lens group G4 move in the main optical axis direction of the zoom lens;
the first fixed lens group G1 is composed of a first fixed lens a1 with negative focal power, a second fixed lens a2 with positive focal power, a third fixed lens a3 with positive focal power and a fourth fixed lens a4 with positive focal power from the object plane side to the image plane side in sequence, and the first fixed lens a1 and the second fixed lens a2 are glued;
the variable magnification lens group G2 sequentially comprises a first variable magnification lens b1 with negative focal power, a second variable magnification lens b2 with negative focal power, a third variable magnification lens b3 with positive focal power and a fourth variable magnification lens b4 with negative focal power from the object plane side to the image plane side;
the second fixed lens group G3 is composed of, in order from the object plane side to the image plane side, a fifth fixed lens a5 of positive power, a sixth fixed lens a6 of negative power, a seventh fixed lens a7 of positive power, an eighth fixed lens a8 of negative power, and a ninth fixed lens a9 of positive power, wherein the sixth fixed lens a6 and the seventh fixed lens a7 constitute a doublet lens, and the eighth fixed lens a8 and the ninth fixed lens a9 constitute a doublet lens.
The focusing lens group G4 comprises a first focusing lens c1 with positive focal power and a second focusing lens c2 with negative focal power in sequence from the object plane side to the image plane side, and the first focusing lens c1 and the second focusing lens c2 are glued;
the third fixed lens group G5 is composed of a tenth fixed lens a10 having negative power and an eleventh fixed lens a11 having positive power in this order from the object plane side to the image plane side, and the tenth fixed lens a10 and the eleventh fixed lens a11 are cemented.
The auxiliary component G6 is a piece of protective glass CG.
The basic lens data of the zoom lens of the present 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.
The plane number column shows the plane number when the object-side plane is the 1 st plane and the number is increased one by one toward the image side; the surface type of a certain lens is shown in the surface type column; the curvature radius column shows the curvature radius of a certain lens, when the curvature radius is positive, the surface is bent towards the object side, and when the curvature radius is negative, the surface is bent towards the image side; the center thickness column shows the surface spacing on the optical axis of each surface from the surface adjacent to the image side thereof; 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 values of the respective variable parameters when the zoom lens is in the WIDE-angle end state, and the TELE column indicates specific values of the respective variable parameters when the zoom lens is in the telephoto end state.
In Table 3, K is the conic coefficient, e is the scientific count number, e.g., e-05 indicates 10 -5 。
[ Table 1 ]
[ Table 2 ]
| WIDE | TELE | |
| D1 | 0.5 | 30.95 |
| D2 | 31.47 | 1.02 |
| D3 | 0.7 | 5.3 |
| D4 | 14.6 | 10 |
[ Table 3 ]
In this example fw=5.3 mm, ft=130 mm, ft/fw=24.53, ttl= 90.51mm.
Wherein ft is a focal length of the zoom lens in a telescopic state, fw is a focal length of the zoom lens in a wide-angle state, and TTL is an optical total length of the zoom lens.
fG5＝14.37mm，fG5/fw＝2.71；
Wherein fG5 is a focal length of the third fixed lens group G5.
XG2＝30.45mm，XG4＝4.6mm，XG2/TTL＝0.336，XG4/XG2＝0.15；
Wherein XG2 is a moving distance of the variable magnification lens group G2, and XG4 is a moving distance of the focusing lens group G4.
R111＝7.13mm，R112＝82.96mm，R112/(R111+R112)＝0.921；
Wherein R111 is a radius of curvature of the eleventh fixed lens a11 near the object-side curved surface, and R112 is a radius of curvature of the eleventh fixed lens a11 near the image-side curved surface.
f1＝fa67＝22.64mm；f2＝fa89＝175.54mm；
f1/fw＝4.27，f2/fw＝33.12；
Wherein f1 and f2 are focal lengths of the two groups of cemented lenses in the second fixed lens group G3 respectively; fa67 is the combined focal length of the double-cemented lens formed by the sixth fixed lens a6 and the seventh fixed lens a7, and fa89 is the combined focal length of the double-cemented lens formed by the eighth fixed lens a8 and the ninth fixed lens a 9.
Example 3
As shown in fig. 6 to 10, a zoom lens is composed of, in order from an object plane side to an image plane side, a first fixed lens group G1 of positive power, a variable lens group G2 of negative power, a second fixed lens group G3 of positive power, a focusing lens group G4 of negative power, a third fixed lens group G5 of positive power, and an auxiliary component G6;
the zoom lens group G2 and the focus lens group G4 move in the main optical axis direction of the zoom lens;
the first fixed lens group G1 is composed of a first fixed lens a1 with negative focal power, a second fixed lens a2 with positive focal power, a third fixed lens a3 with positive focal power and a fourth fixed lens a4 with positive focal power from the object plane side to the image plane side in sequence, and the first fixed lens a1 and the second fixed lens a2 are glued;
the variable magnification lens group G2 sequentially comprises a first variable magnification lens b1 with negative focal power, a second variable magnification lens b2 with negative focal power, a third variable magnification lens b3 with positive focal power and a fourth variable magnification lens b4 with negative focal power from the object plane side to the image plane side;
the second fixed lens group G3 is composed of, in order from the object plane side to the image plane side, a fifth fixed lens a5 of positive power, a sixth fixed lens a6 of negative power, a seventh fixed lens a7 of positive power, an eighth fixed lens a8 of negative power, and a ninth fixed lens a9 of positive power, wherein the sixth fixed lens a6 and the seventh fixed lens a7 constitute a doublet lens, and the eighth fixed lens a8 and the ninth fixed lens a9 constitute a doublet lens.
The focusing lens group G4 comprises a first focusing lens c1 with positive focal power and a second focusing lens c2 with negative focal power in sequence from the object plane side to the image plane side, and the first focusing lens c1 and the second focusing lens c2 are glued;
the third fixed lens group G5 is composed of a tenth fixed lens a10 having positive power and an eleventh fixed lens a11 having positive power in this order from the object plane side to the image plane side.
The auxiliary component G6 is a piece of protective glass CG.
The basic lens data of the zoom lens of the present 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.
The plane number column shows the plane number when the object-side plane is the 1 st plane and the number is increased one by one toward the image side; the surface type of a certain lens is shown in the surface type column; the curvature radius column shows the curvature radius of a certain lens, when the curvature radius is positive, the surface is bent towards the object side, and when the curvature radius is negative, the surface is bent towards the image side; the center thickness column shows the surface spacing on the optical axis of each surface from the surface adjacent to the image side thereof; 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 values of the respective variable parameters when the zoom lens is in the WIDE-angle end state, and the TELE column indicates specific values of the respective variable parameters when the zoom lens is in the telephoto end state.
In Table 6, K is the conic coefficient, e is the scientific count number, e.g., e-05 indicates 10 -5 。
[ Table 4 ]
| Face numbering | Surface type | Radius of curvature/mm | Center thickness/mm | Refractive index | Abbe number |
| OBJ | |||||
| S1 | Spherical surface | 80.11 | 1.20 | 1.91 | 35.25 |
| S2 | Spherical surface | 39.08 | 5.85 | 1.44 | 94.58 |
| S3 | Spherical surface | -279.16 | 0.12 | ||
| S4 | Spherical surface | 36.30 | 4.73 | 1.44 | 94.58 |
| S5 | Spherical surface | -2349.30 | 0.10 | ||
| S6 | Spherical surface | 34.69 | 2.80 | 1.50 | 81.61 |
| S7 | Spherical surface | 83.79 | D1 | ||
| S8 | Aspherical surface | 30.86 | 0.55 | 1.81 | 41.01 |
| S9 | Aspherical surface | 10.07 | 2.62 | ||
| S10 | Spherical surface | -20.43 | 0.55 | 1.77 | 49.62 |
| S11 | Spherical surface | 10.24 | 1.95 | 1.95 | 17.98 |
| S12 | Spherical surface | 50.12 | 1.17 | ||
| S13 | Spherical surface | -11.69 | 0.55 | 1.73 | 54.67 |
| S14 | Spherical surface | -38.95 | D2 | ||
| STO | Spherical surface | INF | 0.10 | ||
| S16 | Aspherical surface | 14.99 | 3.36 | 1.81 | 41.01 |
| S17 | Aspherical surface | -74.85 | 0.10 | ||
| S18 | Spherical surface | 215.06 | 0.55 | 1.65 | 39.55 |
| S19 | Spherical surface | 11.62 | 4.87 | 1.44 | 94.58 |
| S20 | Spherical surface | -21.13 | 0.10 | ||
| S21 | Spherical surface | 15.28 | 0.55 | 1.73 | 28.31 |
| S22 | Spherical surface | 8.42 | 3.95 | 1.44 | 94.58 |
| S23 | Spherical surface | -30.54 | D3 | ||
| S24 | Spherical surface | -72.52 | 1.55 | 1.95 | 17.98 |
| S25 | Spherical surface | -16.24 | 0.55 | 1.67 | 32.17 |
| S26 | Spherical surface | 8.29 | D4 | ||
| S27 | Spherical surface | 27.45 | 1.37 | 1.49 | 70.45 |
| S28 | Spherical surface | 189.46 | 0.10 | ||
| S29 | Spherical surface | 10.53 | 2.23 | 1.59 | 61.25 |
| S30 | Spherical surface | -165.31 | 1.90 | ||
| S31 | Spherical surface | INF | 1.10 | 1.52 | 64.2 |
| S32 | Spherical surface | INF | 1.00 | ||
| IMG |
[ Table 5 ]
| WIDE | TELE | |
| D1 | 0.5 | 30.95 |
| D2 | 31.47 | 1.02 |
| D3 | 0.9 | 5.5 |
| D4 | 14.6 | 10 |
[ Table 6 ]
In this example fw=5.3 mm, ft=130 mm, ft/fw=24.53, ttl=93.04 mm.
Wherein ft is a focal length of the zoom lens in a telescopic state, fw is a focal length of the zoom lens in a wide-angle state, and TTL is an optical total length of the zoom lens.
fG5＝13.58mm，fG5/fw＝2.56；
Wherein fG5 is a focal length of the third fixed lens group G5.
XG2＝30.45mm，XG4＝4.6mm，XG2/TTL＝0.327，XG4/XG2＝0.15；
Wherein XG2 is a moving distance of the variable magnification lens group G2, and XG4 is a moving distance of the focusing lens group G4.
R111＝10.53mm，R112＝-165.31mm，R112/(R111+R112)＝1.07；
Wherein R111 is a radius of curvature of the eleventh fixed lens a11 near the object-side curved surface, and R112 is a radius of curvature of the eleventh fixed lens a11 near the image-side curved surface.
f1＝fa89＝36.86mm；f2＝fa67＝164.23mm；
f1/fw＝6.95；f2/fw＝30.99；
Wherein f1 and f2 are focal lengths of the two groups of cemented lenses in the second fixed lens group G3 respectively; fa67 is the combined focal length of the double-cemented lens formed by the sixth fixed lens a6 and the seventh fixed lens a7, and fa89 is the combined focal length of the double-cemented lens formed by the eighth fixed lens a8 and the ninth fixed lens a 9.
Example 4
An image forming apparatus, as shown in fig. 1 to 10, includes: the zoom lens described in any one of the embodiments above, and the imaging element configured to receive an image formed by the zoom lens.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The zoom lens is characterized by comprising a first fixed lens group with positive focal power, a zoom 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 in sequence from an object plane side to an image plane side;
the zoom lens group and the focusing lens group move along the main optical axis direction of the zoom lens;
the first fixed lens group consists of a first fixed lens with negative focal power, a second fixed lens with positive focal power, a third fixed lens with positive focal power and a fourth fixed lens with positive focal power in sequence from the object plane side to the image plane side, and the first fixed lens and the second fixed lens are glued;
the zoom lens group comprises a first zoom lens with negative focal power, a second zoom lens with negative focal power, a third zoom lens with positive focal power and a fourth zoom lens with negative focal power in sequence from an object plane side to an image plane side;
the focusing lens group comprises a first focusing lens with positive focal power and a second focusing lens with negative focal power in sequence from the object plane side to the image plane side, and the first focusing lens and the second focusing lens are glued;
the second fixed lens group comprises two groups of cemented lenses;
the third fixed lens group at least comprises a lens with positive focal power;
the zoom lens satisfies the following conditional expression:
ft/fw＞20；
TTL＜100mm；
2＜fG5/fw＜3；
wherein ft is a focal length of the zoom lens in a telephoto state, fw is a focal length of the zoom lens in a wide-angle state, TTL is an optical total length of the zoom lens, and fG5 is a focal length of the third fixed lens group.
2. A zoom lens according to claim 1, wherein:
the second fixed lens group sequentially comprises a fifth fixed lens with positive focal power, a sixth fixed lens with negative focal power, a seventh fixed lens with positive focal power, an eighth fixed lens with negative focal power and a ninth fixed lens with positive focal power from the object plane side to the image plane side, wherein the sixth fixed lens and the seventh fixed lens form a double-cemented lens, and the eighth fixed lens and the ninth fixed lens form the double-cemented lens.
3. A zoom lens according to claim 1, wherein:
the third fixed lens group is composed of a tenth fixed lens with negative focal power and an eleventh fixed lens with positive focal power in sequence from the object plane side to the image plane side, and the tenth fixed lens and the eleventh fixed lens are glued.
4. A zoom lens according to claim 1, wherein:
the third fixed lens group is composed of a tenth fixed lens with positive focal power and an eleventh fixed lens with positive focal power in sequence from the object plane side to the image plane side.
5. A zoom lens according to claim 1, wherein:
and an aspheric lens is arranged in each of the variable magnification lens group and the second fixed lens group.
6. A zoom lens according to claim 1, wherein:
the zoom lens satisfies the following conditional expression:
0.3＜XG2/TTL＜0.35；
wherein XG2 is the moving distance of the variable magnification lens group.
7. A zoom lens according to claim 1, wherein:
the zoom lens satisfies the following conditional expression:
0.1＜XG4/XG2＜0.2；
wherein XG4 is the moving distance of the focusing lens group.
8. A zoom lens according to claim 3 or 4, wherein:
the eleventh fixed lens satisfies the following conditional expression:
0.9＜R112/(R111+R112)＜1.2；
wherein R111 is a radius of curvature of the surface of the eleventh fixed lens near the object plane, and R112 is a radius of curvature of the surface of the eleventh fixed lens near the image plane.
9. A zoom lens according to claim 1, wherein:
two groups of cemented lenses in the second fixed lens group respectively meet one of the following conditional expressions:
4＜f1/fw＜8；
30＜f2/fw＜35；
wherein f1 and f2 are focal lengths of the two groups of cemented lenses in the second fixed lens group respectively.
10. An image forming apparatus, comprising:
the 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311618204.7A CN117826387A (en) | 2023-11-30 | 2023-11-30 | Zoom lens and imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311618204.7A CN117826387A (en) | 2023-11-30 | 2023-11-30 | Zoom lens and imaging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117826387A true CN117826387A (en) | 2024-04-05 |
Family
ID=90521789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311618204.7A Pending CN117826387A (en) | 2023-11-30 | 2023-11-30 | Zoom lens and imaging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117826387A (en) |
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2023
- 2023-11-30 CN CN202311618204.7A patent/CN117826387A/en active Pending
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