CN218158534U - Zoom lens - Google Patents
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- CN218158534U CN218158534U CN202222291737.6U CN202222291737U CN218158534U CN 218158534 U CN218158534 U CN 218158534U CN 202222291737 U CN202222291737 U CN 202222291737U CN 218158534 U CN218158534 U CN 218158534U
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Abstract
The utility model relates to a zoom lens, along the direction of optical axis from the thing side to image side, include the fixed lens group that has negative focal power in proper order, have the zoom lens group of positive focal power and have the lens group that focuses of positive focal power, wherein, be used for zoom lens realize optical zoom between wide-angle end and telephoto end zoom lens group with be used for compensating the optical zoom in-process position variation of image plane focus lens group is followed the optical axis is portable, zoom lens group is in proper order including the fourth lens that has negative focal power, the fifth lens that has positive focal power, the sixth lens that has positive focal power and the seventh lens that has negative focal power, the diaphragm set up in the fifth lens with between the sixth lens. The focal power of the lens group and the arrangement of the lenses are reasonably distributed, the small volume, the large aperture and the large target surface of the zoom lens can be realized, and the resolution of the full-focus section can reach more than four million.
Description
Technical Field
The utility model relates to an optical lens field, concretely designs a zoom lens.
Background
At present, most of the smart home lenses on the market are fixed focus, binocular or digital zoom lenses, and the requirements of the market cannot be met. The zoom ratio of the zoom lens and the front end caliber and the total length of the lens have a mutual restriction relationship, and miniaturization is difficult to realize; if the zoom lens adopts a large aperture, although enough light can be captured in a dark field and at night, the effects of obvious aberration and insufficiently clear imaging are often brought.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to a zoom lens, which takes into account the size of the lens, the aperture and the target surface, and can clearly form images.
An embodiment of the present invention provides a zoom lens, along the direction of optical axis from the object side to the image side, include in proper order fixed lens group with negative focal power, zoom lens group with positive focal power and focus lens group with positive focal power, wherein, be used for zoom lens realize optical zoom between wide-angle end and telephoto end zoom lens group with be used for compensating the position change of optical zoom in-process image plane focus lens group is followed the optical axis is portable, zoom lens group includes in proper order fourth lens with negative focal power, fifth lens with positive focal power, sixth lens with positive focal power and seventh lens with negative focal power, the diaphragm set up in fifth lens with between the sixth lens.
Preferably, the fixed lens group includes, in order from the object side to the image side along the optical axis, a first lens having a negative power, a second lens having a negative power, and a third lens having a positive power.
Preferably, the first lens is a paraxial region convex-concave lens, and the second lens and the third lens are paraxial region convex-concave lenses in a direction from the object side to the image side along the optical axis.
Preferably, the fourth lens and the seventh lens have negative optical power, and the fifth lens and the sixth lens have positive optical power
Preferably, the fourth lens and the fifth lens constitute a cemented doublet having positive optical power.
Preferably, in a direction from the object side to the image side along the optical axis, the fourth lens and the fifth lens are convex-concave lenses, the sixth lens is a paraxial region convex-convex lens, and the seventh lens is a paraxial region concave-concave lens.
Preferably, the abbe number Vd5 of the fifth lens satisfies the following relationship: vd5 is more than or equal to 60 and less than or equal to 90.
Preferably, the refractive index Nd4 of the fourth lens satisfies the following relationship: nd4 is less than or equal to 1.65; and a refractive index Nd5 of the fifth lens satisfy the following relationship: nd5 is less than or equal to 1.65.
Preferably, the focus lens group includes, in order in a direction from the object side to the image side along the optical axis, an eighth lens having positive optical power and a ninth lens having negative optical power.
Preferably, in a direction from the object side to the image side along the optical axis, the eighth lens is a paraxial region convex-concave lens, and the ninth lens is a paraxial region convex-concave lens.
Preferably, the zoom lens includes seven plastic aspheric lenses.
Preferably, the focal length FG1 of the fixed lens group and the focal length Fw of the wide-angle end of the zoom lens satisfy the following relationship: FG1/Fw is more than or equal to-1.8 and less than or equal to-1.5; a focal length FG2 of the zoom lens group and a focal length Fw of the zoom lens at the wide-angle end satisfy the following relationship: FG2/Fw is more than or equal to 1.7 and less than or equal to 1.9; a focal length FG3 of the focus lens group and a focal length Fw of the zoom lens at the wide-angle end satisfy the following relationship: FG3/Fw is more than or equal to 4.1 and less than or equal to 4.4.
Preferably, the target surface diameter of the zoom lens
And the total length TTL of the zoom lens satisfies the following relation:
preferably, the absolute value D2 of the stroke of the zoom lens group and the total length TTL of the zoom lens satisfy the following relationship: D2/TTL is more than or equal to 0.1 and less than or equal to 0.2.
According to the utility model discloses an aspect adopts three lens group structures, has realized big target surface
The sum maximum aperture can reach F1.7, the performance requirement of a small volume, a large aperture and a large target surface is met, and four million full-focus imaging can be realized.
According to the utility model discloses an aspect, through reasonable lens focal power distribution and specific glass material selection, has realized chromatic aberration and second grade spectral correction between the tele end 435 ~ 850nm, can satisfy the infrared confocal of full focus section.
According to an aspect of the utility model, the temperature range of-40 ℃ to 80 ℃ is not virtual burnt through the temperature coefficient collocation of the refractive index of the specific material of lens, and the full focus section satisfies four million resolution ratio formation of image.
According to the utility model discloses an aspect, the quantity that rationally sets up plastic aspheric surface lens realizes the low cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic optical structure diagram of a zoom lens according to a first embodiment of the present invention;
fig. 2 is an optical schematic diagram of a zoom lens according to a second embodiment of the present invention;
fig. 3 is a schematic view of an optical structure of a zoom lens according to a third embodiment of the present invention;
fig. 4 is an optical structure diagram of a zoom lens according to a fourth embodiment of the present invention.
Description of reference numerals:
a fixed lens group G1, a zoom lens group G2, a focus lens group G3;
first lens-L1, second lens-L2, third lens-L3, fourth lens-L4, fifth lens-L5, sixth lens-L6, seventh lens-L7, eighth lens-L8, ninth lens-L9, stop-STO and plate CG.
Detailed Description
The description of the embodiments of this specification should be taken in conjunction with the accompanying drawings, which are to be considered part of the entire written description. In the drawings, the shape or thickness of the embodiments may be exaggerated and simplified or conveniently indicated. Further, the components of the structures in the drawings are described separately, and it should be noted that the components not shown or described in the drawings are in a form known to those skilled in the art.
Any reference to directions and orientations to the description of the embodiments herein is merely for convenience of description and should not be construed as limiting the scope of the present invention in any way. The following description of the preferred embodiments refers to combinations of features which may be present independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the claims.
As shown in fig. 1, it is a schematic diagram of an optical structure of a zoom lens according to an embodiment of the present invention. The zoom lens includes a fixed lens group G1 having a negative power, a zoom lens group G2 having a positive power, and a focus lens group G3 having a positive power in this order. The zoom lens group G2 moves along the optical axis direction to realize optical zooming of the zoom lens between the wide-angle end and the telephoto end, and the focus lens group G3 moves along the optical axis direction to compensate position variation of an image plane in the optical zooming process. The zoom lens group G2 includes, in order from the object side to the image side along the optical axis, a fourth lens L4 having negative optical power, a fifth lens L5 having positive optical power, a sixth lens L6 having positive optical power, and a seventh lens L7 having negative optical power, with a stop STO provided between the fifth lens L5 and the sixth lens L6. Through reasonable distribution of focal power of the lens group and lens arrangement, small size, large aperture and large target surface of the zoom lens can be realized, the confocal lens is realized day and night, and the resolution of a full-focus section can reach more than four million.
As shown in fig. 1, in the present embodiment, the fixed lens group G1 includes a first lens L1, a second lens L2, and a third lens L3. The zoom lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The focus lens group G3 includes an eighth lens L8 and a ninth lens L9. The first lens L1 is a concave-convex plastic aspheric lens with negative focal power, the second lens L2 is a concave-convex plastic aspheric lens with negative focal power, the third lens L3 is a concave-convex plastic aspheric lens with positive focal power, the fourth lens L4 is a concave-convex glass spherical lens with negative focal power, the fifth lens L5 is a concave-convex glass spherical lens with positive focal power, the sixth lens L6 is a convex-convex plastic aspheric lens with positive focal power, the seventh lens L7 is a concave-concave plastic aspheric lens with negative focal power, the eighth lens L8 is a convex-convex plastic aspheric lens with positive focal power, and the ninth lens L9 is a concave-convex plastic aspheric lens with negative focal power. The stop STO is disposed between the fifth lens L5 and the sixth lens L6. Therefore, through reasonable distribution of the focal power of the lens and reasonable setting of the shape and the material of the lens, the aberration of the zoom lens is well corrected.
As shown in fig. 1, in the present embodiment, the fourth lens L4 and the fifth lens L5 constitute a double cemented lens having positive refractive power, and partial chromatic aberration can be well eliminated.
As shown in fig. 1, in the present embodiment, the first lens L1, the second lens L2, the third lens L3, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 are all aspheric lenses made of plastic material, so that the cost can be reduced, and the zoom lens can be ensured to have good performance at high and low temperatures.
As shown in fig. 1, in the present embodiment, the focal length FG1 of the fixed lens group G1 and the focal length Fw at the wide-angle end of the zoom lens satisfy the following relationship: FG1/Fw is more than or equal to-1.8 and less than or equal to-1.5; the focal length FG2 of the zoom lens group G2 and the focal length Fw at the wide-angle end of the zoom lens satisfy the following relationship: FG2/Fw is more than or equal to 1.7 and less than or equal to 1.9; the focal length FG3 of the focus lens group G3 and the focal length Fw at the wide-angle end of the zoom lens satisfy the following relationship: FG3/Fw is more than or equal to 4.1 and less than or equal to 4.4. The ratio of the focal length of each lens group to the focal length of the optical system is reasonably distributed, so that light passing through the lens groups is smoothly transmitted, single parts and assembly tolerance are good, the manufacturability is good, and the resolution of the optical system is favorably improved.
As shown in FIG. 1, in the present embodiment, the target surface diameter of the zoom lens
The total length TTL of the zoom lens satisfies the following relation:
this contributes to miniaturization of the zoom lens.
As shown in fig. 1, in the present embodiment, the abbe number Vd5 of the fifth lens L5 satisfies the following relationship: vd5 is more than or equal to 60 and less than or equal to 90. Therefore, the second-order spectral color difference is corrected by selecting proper materials for matching.
As shown in fig. 1, in the present embodiment, the refractive index Nd4 of the fourth lens L4 satisfies the following relationship: nd4 is less than or equal to 1.65; the refractive index Nd5 of the fifth lens L5 satisfies the following relationship: nd5 is less than or equal to 1.65. Therefore, the second-order spectral color difference can be corrected through proper material matching.
As shown in fig. 1, in the present embodiment, the absolute value D2 of the stroke of the zoom lens group G2 and the total length TTL of the zoom lens satisfy the following relationship: D2/TTL is more than or equal to 0.1 and less than or equal to 0.2. Therefore, the zoom lens is beneficial to the faster zooming and miniaturization.
To sum up, the zoom lens of the embodiment of the present invention has the following effects: (1) the utility model discloses a three crowd's framework has realized big target surface
The maximum aperture can reach F1.7, the performance requirement of a small volume, a large aperture and a large target surface is met, and four million full-focus imaging can be realized; (2) the utility model realizes chromatic aberration and second-level spectrum correction between 435-850 nm of the telephoto end by reasonable focal power distribution and selection of specific glass materials, and can satisfy the requirement of full-focus infraredConfocal; (3) the utility model realizes no virtual focus at the temperature of-40 ℃ to +80 ℃ by matching the temperature coefficients of the refractive indexes of the specific materials, and the full focus end meets imaging with four million resolution; (4) the utility model discloses a rationally use the plastic aspheric surface to realize the low cost.
The zoom lens of the present invention will be specifically described below with reference to four embodiments with reference to the drawings and tables. In each embodiment below, the utility model discloses record diaphragm STO into one side, record image plane IMA into one side.
The parameters of each example specifically satisfying the above conditional expressions are shown in table 1 below:
table 1 in an embodiment of the present invention, an aspheric lens of the zoom lens satisfies the following formula:
in the above formula, z is the axial distance from the curved surface to the vertex at the position where the height perpendicular to the optical axis is y along the optical axis direction; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a. The 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 The values of the aspheric coefficients represent fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders.
Example one
As shown in fig. 1, in the first embodiment, the curvature radius R, the thickness d, the refractive index Nd, and the abbe number Vd of each surface of the zoom lens are shown in the following table (table 2):
TABLE 2
In table 2, the surface numbers refer to surfaces of the respective lenses from the object side to the image side of the zoom lens, for example, the surface numbers 1, 2 represent both surfaces of the first lens L1, the surface numbers 3, 4 represent both surfaces of the second lens L2, and so on; STO is the diaphragm and IMA is the image plane.
In the first embodiment, the K value and aspheric coefficient of the zoom lens are as follows (table 3):
| noodle sequence number | Value of K | A4 | A6 | A8 | A10 | A12 |
| 1 | 50.00 | -3.24E-03 | 4.95E-04 | -2.98E-05 | 9.04E-07 | -1.10E-08 |
| 2 | -0.68 | -3.38E-03 | 2.98E-04 | 1.42E-04 | -1.95E-05 | 1.28E-06 |
| 3 | -6.18 | -3.79E-03 | 1.34E-03 | -2.26E-04 | 2.12E-05 | -1.16E-06 |
| 4 | -35.40 | 3.10E-03 | -1.08E-04 | -3.00E-05 | 1.17E-06 | -2.87E-07 |
| 5 | 85.65 | -3.06E-03 | -1.96E-04 | -2.95E-05 | 5.46E-06 | -4.51E-07 |
| 6 | -22.33 | -5.03E-03 | 3.36E-04 | -6.00E-05 | 4.97E-06 | -1.56E-07 |
| 11 | 5.05 | -2.26E-03 | -9.95E-05 | -5.63E-05 | 6.67E-06 | -4.53E-07 |
| 12 | -10.66 | 7.99E-04 | 1.28E-04 | -5.69E-05 | 5.72E-06 | -5.49E-07 |
| 13 | -20.95 | 1.49E-03 | 2.12E-04 | -8.51E-06 | -1.46E-06 | -1.97E-07 |
| 14 | -50.00 | 3.62E-03 | -3.39E-04 | 9.23E-05 | -1.44E-05 | 7.59E-07 |
| 15 | 9.15 | -5.30E-03 | -4.90E-04 | 3.39E-05 | 6.01E-06 | -8.39E-07 |
| 16 | 8.06 | -2.30E-03 | 4.41E-05 | -4.31E-05 | -9.89E-07 | 4.50E-07 |
| 17 | 0.04 | 1.82E-02 | -5.14E-04 | -7.20E-05 | 5.59E-07 | 5.04E-07 |
| 18 | -0.73 | 1.14E-02 | -2.88E-04 | -6.29E-05 | 2.85E-06 | 1.26E-08 |
TABLE 3
In the first embodiment, zoom lens wide-angle end and telephoto end magnification variation data are as follows (table 4):
TABLE 4
With reference to fig. 1 and tables 1-4, the zoom lens of the present embodiment employs 9 lenses, wherein 7 plastic aspheric lenses, one double cemented lens, and a maximum aperture F1.7, correct the position chromatic aberration and the magnification chromatic aberration between 435 nm and 850nm, and realize confocal images between 435 nm and 850 nm; the high and low temperature of minus 40 ℃ to 80 ℃ still meets the full four million resolution without refocusing. The lens has small size and large aperture, and is suitable for more scenes with different conditions.
Example two
As shown in fig. 2, in the second embodiment, the curvature radius R, the thickness d, the refractive index Nd, and the abbe number Vd of each surface of the zoom lens are shown in the following table (table 5):
| number of noodles | Surface type | Radius of curvature R | Thickness d | Refractive index Nd | Abbe number Vd |
| 1 | Aspherical surface | 47.42 | 1.00 | 1.54 | 56 |
| 2 | Aspherical surface | 3.76 | 2.40 | ||
| 3 | Aspherical surface | -3.64 | 0.60 | 1.54 | 56 |
| 4 | Aspherical surface | -8.88 | 0.07 | ||
| 5 | Aspherical surface | -49.95 | 1.39 | 1.66 | 20.4 |
| 6 | Aspherical surface | -10.05 | 3.34 | ||
| 7 | Spherical surface | 5.79 | 0.50 | 1.60 | 38 |
| 8 | Spherical surface | 4.80 | 1.38 | 1.64 | 86.1 |
| 9 | Spherical surface | 218.67 | 0.09 | ||
| 10(STO) | Spherical surface | Infinity | 0.07 | ||
| 11 | Aspherical surface | 8.72 | 1.18 | 1.54 | 55.7 |
| 12 | Aspherical surface | -8.84 | 0.22 | ||
| 13 | Aspherical surface | -12.07 | 0.50 | 1.66 | 20.4 |
| 14 | Aspherical surface | 19.29 | 0.70 | ||
| 15 | Aspherical surface | 16.42 | 1.18 | 1.54 | 55.7 |
| 16 | Aspherical surface | -9.30 | 0.38 | ||
| 17 | Aspherical surface | -3.40 | 0.80 | 1.64 | 23.4 |
| 18 | Aspherical surface | -4.26 | 4.41 | ||
| 19 | Spherical surface | Infinity | 0.80 | 1.52 | 64.2 |
| 20 | Spherical surface | Infinity | 0.20 | ||
| IMA | Spherical surface | Infinity | 0.00 |
TABLE 5
In table 5, the numbers of surfaces refer to the surfaces of the respective lenses from the object side to the image side of the zoom lens, for example, the numbers 1 and 2 represent the two surfaces of the first lens L1, the numbers 3 and 4 represent the two surfaces of the second lens L2, and so on; STO is a diaphragm, and IMA is an image plane.
In the second embodiment, the K value and the aspheric coefficient of the zoom lens are as follows (table 6):
| number of noodles | Value of K | A4 | A6 | A8 | A10 | A12 |
| 1 | -64.14 | -4.24E-03 | 5.06E-04 | -2.96E-05 | 9.05E-07 | -1.11E-08 |
| 2 | -0.79 | -3.64E-03 | 2.37E-04 | 1.50E-04 | -2.22E-05 | 1.50E-06 |
| 3 | -6.74 | -4.00E-03 | 1.31E-03 | -2.28E-04 | 2.02E-05 | -1.34E-06 |
| 4 | -32.43 | 3.33E-03 | -1.09E-04 | -3.33E-05 | 9.34E-07 | -4.82E-07 |
| 5 | -87.00 | -2.65E-03 | -1.24E-04 | -2.11E-05 | 5.37E-06 | -5.46E-07 |
| 6 | -30.70 | -4.82E-03 | 3.37E-04 | -5.90E-05 | 5.34E-06 | -1.79E-07 |
| 11 | 6.30 | -7.39E-04 | -4.15E-05 | -5.24E-05 | 6.96E-06 | -4.82E-07 |
| 12 | -6.17 | 7.04E-04 | 1.91E-04 | -4.68E-05 | 7.16E-06 | -4.43E-07 |
| 13 | -45.39 | 1.76E-03 | 2.30E-04 | -2.82E-06 | -4.96E-07 | 1.56E-08 |
| 14 | 35.03 | 5.42E-03 | -1.88E-04 | 9.21E-05 | -1.52E-05 | 9.84E-07 |
| 15 | -4.38 | -5.62E-03 | -5.20E-04 | 2.52E-05 | 4.69E-06 | -7.01E-07 |
| 16 | 8.43 | -2.10E-03 | 7.46E-05 | -4.17E-05 | -9.34E-07 | 4.58E-07 |
| 17 | 0.02 | 1.87E-02 | -4.97E-04 | -6.98E-05 | 8.28E-07 | 5.39E-07 |
| 18 | -0.77 | 1.15E-02 | -2.91E-04 | -6.68E-05 | 2.73E-06 | 6.60E-08 |
TABLE 6
In the second embodiment, the zoom lens wide-angle end and telephoto end magnification variation data are as follows (table 7):
| wide angle end | The telescope end | |
| T1 | 3.34 | 0.50 |
| T2 | 0.70 | 3.04 |
| T3 | 4.41 | 4.91 |
TABLE 7
With reference to fig. 2 and tables 1 and 5-7, the zoom lens of the present embodiment employs 9 lenses, wherein 7 plastic aspheric lenses, one double cemented lens, and a maximum aperture F1.7, corrects a positional chromatic aberration and a magnification chromatic aberration between 435 nm and 850nm, and realizes a confocal measurement between 435 nm and 850 nm; the high and low temperature of minus 40 ℃ to 80 ℃ still meets the full four million resolution without refocusing. The lens has small size and large aperture, and is suitable for more scenes with different conditions.
EXAMPLE III
As shown in fig. 3, in the third embodiment, the radius of curvature R, the thickness d, the refractive index Nd, and the abbe number Vd of each surface of the zoom lens are as follows (table 8):
| number of noodles | Surface type | Radius of curvature R | Thickness d | Refractive index Nd | Abbe number Vd |
| 1 | Aspherical surface | 51.23 | 1.00 | 1.54 | 56 |
| 2 | Aspherical surface | 3.76 | 2.48 | ||
| 3 | Aspherical surface | -3.64 | 0.63 | 1.54 | 56 |
| 4 | Aspherical surface | -9.15 | 0.08 | ||
| 5 | Aspherical surface | -46.59 | 1.46 | 1.66 | 20.4 |
| 6 | Aspherical surface | -10.03 | 3.34 | ||
| 7 | Spherical surface | 5.82 | 0.50 | 1.62 | 36.3 |
| 8 | Spherical surface | 3.83 | 1.69 | 1.64 | 62.9 |
| 9 | Spherical surface | 187.49 | 0.35 | ||
| 10(STO) | Spherical surface | Infinity | -0.30 | ||
| 11 | Aspherical surface | 8.69 | 1.37 | 1.54 | 55.7 |
| 12 | Aspherical surface | -8.79 | 0.16 | ||
| 13 | Aspherical surface | -11.86 | 0.63 | 1.66 | 20.4 |
| 14 | Aspherical surface | 19.52 | 0.70 | ||
| 15 | Aspherical surface | 16.71 | 1.40 | 1.54 | 55.7 |
| 16 | Aspherical surface | -9.18 | 0.31 | ||
| 17 | Aspherical surface | -3.38 | 0.80 | 1.64 | 23.4 |
| 18 | Aspherical surface | -4.25 | 4.41 | ||
| 19 | Spherical surface | Infinity | 0.80 | 1.52 | 64.2 |
| 20 | Spherical surface | Infinity | 0.20 | ||
| IMA | Spherical surface | Infinity | 0.00 |
TABLE 8
In table 8, the numbers of surfaces refer to the surfaces of the respective lenses from the object side to the image side of the zoom lens, for example, the numbers 1 and 2 represent the two surfaces of the first lens L1, the numbers 3 and 4 represent the two surfaces of the second lens L2, and so on; STO is a diaphragm, and IMA is an image plane.
In embodiment three, the K value and aspheric coefficient of the zoom lens are as follows (table 9):
TABLE 9
In the third embodiment, the zoom lens wide-angle end and telephoto end magnification variation data refer to the following table (table 10):
| wide angle end | The telescope end | |
| T1 | 3.34 | 0.50 |
| T2 | 0.70 | 3.04 |
| T3 | 4.41 | 4.91 |
TABLE 10
With reference to fig. 3 and tables 1 and 8-10, the zoom lens of the present embodiment employs 9 lenses, wherein 7 plastic aspheric lenses, one double cemented lens, and a maximum aperture F1.7, corrects a positional chromatic aberration and a magnification chromatic aberration between 435 nm and 850nm, and realizes a confocal measurement between 435 nm and 850 nm; the high and low temperature of minus 40 ℃ to 80 ℃ still meets the full four million resolution without refocusing. The lens has small size and large aperture, and is suitable for more scenes with different conditions.
Example four
As shown in fig. 4, in the fourth embodiment, the radius of curvature R, the thickness d, the refractive index Nd, and the abbe number Vd of each surface of the zoom lens are as follows (table 11):
TABLE 11
In table 11, the numbers of surfaces refer to the surfaces of the respective lenses from the object side to the image side of the zoom lens, for example, the numbers 1 and 2 represent the two surfaces of the first lens L1, the numbers 3 and 4 represent the two surfaces of the second lens L2, and so on; STO is the diaphragm and IMA is the image plane.
In embodiment four, the K value and aspheric coefficient of the zoom lens are as follows (table 12):
| number of noodles | Value of K | A4 | A6 | A8 | A10 | A12 |
| 1 | 142.69 | -3.62E-03 | 4.99E-04 | -2.97E-05 | 9.07E-07 | -1.14E-08 |
| 2 | -0.70 | -3.42E-03 | 2.79E-04 | 1.43E-04 | -2.05E-05 | 1.43E-06 |
| 3 | -6.64 | -3.95E-03 | 1.34E-03 | -2.23E-04 | 2.06E-05 | -1.19E-06 |
| 4 | -37.84 | 3.32E-03 | -1.05E-04 | -3.02E-05 | 1.27E-06 | -3.90E-07 |
| 5 | 91.41 | -2.89E-03 | -1.63E-04 | -2.91E-05 | 5.01E-06 | -4.32E-07 |
| 6 | -25.80 | -5.04E-03 | 3.23E-04 | -6.04E-05 | 5.10E-06 | -1.57E-07 |
| 11 | 5.87 | -1.66E-03 | -6.97E-05 | -5.31E-05 | 6.93E-06 | -4.27E-07 |
| 12 | -8.53 | 8.34E-04 | 1.78E-04 | -4.91E-05 | 6.78E-06 | -4.93E-07 |
| 13 | -30.03 | 1.50E-03 | 2.01E-04 | -7.80E-06 | -1.06E-06 | -3.17E-08 |
| 14 | -11.89 | 4.34E-03 | -2.75E-04 | 9.05E-05 | -1.48E-05 | 8.75E-07 |
| 15 | 12.68 | -5.17E-03 | -4.46E-04 | 3.10E-05 | 5.05E-06 | -8.54E-07 |
| 16 | 8.17 | -2.12E-03 | 6.35E-05 | -4.39E-05 | -1.25E-06 | 4.60E-07 |
| 17 | 0.03 | 1.83E-02 | -5.20E-04 | -7.18E-05 | 8.37E-07 | 5.40E-07 |
| 18 | -0.78 | 1.15E-02 | -2.79E-04 | -6.22E-05 | 2.91E-06 | 2.07E-08 |
TABLE 12
In the fourth embodiment, the zoom lens wide-angle end and telephoto end magnification variation data refer to the following table (table 13):
| wide angle end | Telescope end | |
| T1 | 3.34 | 0.50 |
| T2 | 0.70 | 3.04 |
| T3 | 4.41 | 4.91 |
Watch 13
With reference to fig. 4 and tables 1 and 11-13, the zoom lens of the present embodiment employs 9 lenses, wherein 7 plastic aspheric lenses, one double cemented lens, and a maximum aperture F1.7, corrects a positional chromatic aberration and a magnification chromatic aberration between 435 nm and 850nm, and realizes a confocal measurement between 435 nm and 850 nm; the high and low temperature of minus 40 ℃ to 80 ℃ still meets the full four million resolution without refocusing. The lens has small size and large aperture, and is suitable for more scenes with different conditions.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. A zoom lens including, in order from an object side to an image side along an optical axis, a fixed lens group (G1) having negative optical power, a zoom lens group (G2) having positive optical power, and a focus lens group (G3) having positive optical power, wherein the zoom lens group (G2) for the zoom lens to achieve optical zooming between a wide-angle end and a telephoto end and the focus lens group (G3) for compensating for a positional change of an image plane during the optical zooming are movable along the optical axis,
the zoom lens group (G2) includes a fourth lens (L4), a fifth lens (L5), a sixth lens (L6), and a seventh lens (L7) in this order, and a Stop (STO) is provided between the fifth lens (L5) and the sixth lens (L6).
2. The zoom lens according to claim 1, wherein the fixed lens group (G1) includes, in order from the object side to the image side along the optical axis, a first lens (L1) having negative optical power, a second lens (L2) having negative optical power, and a third lens (L3) having positive optical power.
3. A zoom lens according to claim 2, wherein the first lens (L1) is a paraxial region convex-concave lens, and the second lens (L2) and the third lens (L3) are paraxial region convex-concave lenses in a direction from the object side to the image side along the optical axis.
4. The zoom lens according to claim 1, wherein the fourth lens (L4) and the seventh lens (L7) have negative optical power, and the fifth lens (L5) and the sixth lens (L6) have positive optical power.
5. A zoom lens according to claim 1, wherein the fourth lens (L4) and the fifth lens (L5) constitute a double cemented lens having positive optical power.
6. The zoom lens according to claim 1, wherein in a direction from the object side to the image side along the optical axis, the fourth lens (L4) and the fifth lens (L5) are convex-concave lenses, the sixth lens (L6) is a paraxial region convex-convex lens, and the seventh lens (L7) is a paraxial region concave-concave lens.
7. The zoom lens according to claim 1, wherein the abbe number Vd5 of the fifth lens (L5) satisfies the following relationship: vd5 is more than or equal to 60 and less than or equal to 90.
8. The zoom lens according to claim 1,
the refractive index Nd4 of the fourth lens (L4) satisfies the following relationship: nd4 is less than or equal to 1.65;
the refractive index Nd5 of the fifth lens (L5) satisfies the following relationship: nd5 is less than or equal to 1.65.
9. The zoom lens according to claim 1, wherein the focus lens group (G3) includes, in order from the object side to the image side along the optical axis, an eighth lens (L8) having positive optical power and a ninth lens (L9) having negative optical power.
10. The zoom lens according to claim 9, wherein the eighth lens (L8) is a paraxial region convex-concave lens and the ninth lens (L9) is a paraxial region convex-concave lens in a direction from the object side to the image side along the optical axis.
11. The zoom lens according to any one of claims 1 to 10, wherein the zoom lens includes seven plastic aspheric lenses.
12. The zoom lens according to any one of claims 1 to 10,
a focal length FG1 of the fixed lens group (G1) and a focal length Fw of the zoom lens at the wide-angle end satisfy the following relationship: FG1/Fw is more than or equal to minus 1.8 and less than or equal to minus 1.5;
a focal length FG2 of the zoom lens group (G2) and a focal length Fw of the zoom lens at the wide-angle end satisfy the following relationship: FG2/Fw is more than or equal to 1.7 and less than or equal to 1.9;
a focal length FG3 of the focus lens group (G3) and a focal length Fw of the zoom lens at the wide-angle end satisfy the following relationship: FG3/Fw is more than or equal to 4.1 and less than or equal to 4.4.
13. The zoom lens according to any one of claims 1 to 10, wherein a target surface diameter of the zoom lens
And the total optical length TTL of the zoom lens satisfies the following relation:
14. the zoom lens according to any one of claims 1 to 10, wherein an absolute value D2 of a stroke of the zoom lens group (G2) and a total optical length TTL of the zoom lens satisfy the following relationship: D2/TTL is more than or equal to 0.1 and less than or equal to 0.2.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115343833A (en) * | 2022-08-30 | 2022-11-15 | 舜宇光学(中山)有限公司 | Zoom lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115343833A (en) * | 2022-08-30 | 2022-11-15 | 舜宇光学(中山)有限公司 | Zoom lens |
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