CN217879799U - Zoom lens - Google Patents
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- CN217879799U CN217879799U CN202222459690.XU CN202222459690U CN217879799U CN 217879799 U CN217879799 U CN 217879799U CN 202222459690 U CN202222459690 U CN 202222459690U CN 217879799 U CN217879799 U CN 217879799U
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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 compensation lens group, the diaphragm that has negative focal power, the variable power lens group and the flat board that have positive focal power in proper order, compensation lens group with the variable power lens group is followed the optical axis is portable, compensation lens group includes first lens, second lens, third lens and fourth lens in proper order, variable power lens group includes fifth lens, sixth lens, seventh lens, eighth lens, ninth lens and tenth lens in proper order, wherein, the second lens is paraxial region meniscus lens, the third lens is aspheric lens, the utility model discloses a zoom lens can realize miniaturization, low cost, have infrared confocal, high low temperature excellent performance and wide-angle end field angle and exceed 136 clear image quality zoom of superelevation.
Description
Technical Field
The utility model relates to an optics field, concretely relates to zoom lens.
Background
The zoom lens is an optical lens with continuously changed focal length and unchanged image surface position in the zooming process. Due to the characteristic of variable focal length, the wide-angle lens is widely applied to the fields of security, intelligent transportation, video conferences and the like, and can realize wide-angle shooting and detailed investigation of target details. With the development of technology in recent years, zoom lenses are gradually breaking through in the direction of high pixel, large aperture and low cost. In recent years, new high-resolution, day-night confocal, high-low temperature confocal zoom lenses have become the mainstream, which puts more stringent requirements on the development capability and manufacturing level of zoom lenses.
At present, two-group zoom lenses with high resolution, day and night confocal and high and low temperature confocal are arranged on the market, the clear aperture of the front group of lenses is usually larger, so that the head is large in size, and the requirements of small-size machine types and more customers in and out of sea cannot be met.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to provide a zoom lens, so as to solve the problem that the cost, the volume and the imaging quality of the current zoom lens are difficult to be considered, and the ultra-high definition zoom lens with infrared confocal performance, excellent high and low temperature performance and a wide-angle exceeding 136 ° can be realized in miniaturization and low cost.
The embodiment of the utility model provides a zoom lens, along the direction of optical axis from the thing side to image side, include compensation lens group, the diaphragm that has negative focal power and the variable power lens group and the flat board that have positive focal power in proper order, compensation lens group with the variable power lens group is followed the optical axis is portable, compensation lens group includes first lens, second lens, third lens and fourth lens in proper order, variable power lens group includes fifth lens, sixth lens, seventh lens, eighth lens, ninth lens and tenth lens in proper order, the second lens is paraxial region meniscus lens, the third lens is aspherical lens.
Preferably, the focal power of the first lens is negative, the focal power of the second lens is positive or negative, the focal power of the third lens is negative, and the focal power of the fourth lens is positive.
Preferably, the focal power of the fifth lens is positive, the focal power of the sixth lens is negative, the focal power of the seventh lens is positive, the focal power of the eighth lens is negative, the focal power of the ninth lens is positive, and the focal power of the tenth lens is negative.
Preferably, the first lens is a convex-concave or plano-concave or concave-concave lens, the third lens is a paraxial region concave-concave lens, the fourth lens is a paraxial region convex-convex lens, the fifth lens is a convex-convex lens, the sixth lens is a concave-convex lens, the seventh lens is a paraxial region convex-concave lens, the eighth lens is a paraxial region concave-concave lens, the ninth lens is a paraxial region convex-convex lens, and the tenth lens is a paraxial region concave-concave or concave-convex or concave-flat lens.
Preferably, the second lens, the third lens, the fourth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens are all plastic aspheric lenses.
Preferably, the compensation lens group focal length Fa and the variable magnification lens group focal length Fb satisfy the following relationship:
0.73≤|Fa/Fb|≤0.79。
preferably, the variable power lens group focal length Fb and the wide-angle end focal length fw of the zoom lens satisfy the relation:
2.87≤Fb/fw≤3.02；
the focal length Fb of the zoom lens group and the focal length ft of the telescopic end of the zoom lens satisfy the relation:
1.14≤Fb/ft≤1.20。
preferably, a distance Δ D of the variable power lens group moving from the wide-angle end to the telephoto end of the zoom lens and a wide-angle end total optical length TTL of the zoom lens satisfy a relation:
ΔD/TTL≤0.15。
preferably, an optical effective diameter D1 of the first lens and a wide-angle end optical total length TTL of the zoom lens satisfy the relation:
D1/TTL≤0.28。
preferably, the fifth lens and the sixth lens form a cemented lens group.
Preferably, the focal length F56 of the cemented lens group and the focal length Fb of the variable power lens group satisfy the following relationship:
1.08≤F56/Fb≤1.22。
preferably, the refractive index nd5 and the abbe number vd5 of the fifth lens satisfy the following conditions:
1.48≤nd5≤1.57；
73.46≤vd5≤83.64。
preferably, abbe number vd5 of the fifth lens and abbe number vd6 of the sixth lens satisfy the following condition:
17.96≤vd5-vd6≤28.14。
preferably, the eighth lens focal length f8 and the ninth lens focal length f9 satisfy the following relationship:
-1.25≤f8/f9≤-1.23。
according to the utility model discloses an at least one scheme is through the focal power of each lens of rational configuration for can realize 3 times under the finite space condition and zoom, have high resolution and infrared confocal simultaneously concurrently.
According to the utility model discloses an at least one scheme adopts glass lens and plastic lens collocation, under the condition of using few glass lens, has still guaranteed each item performance of system, has reduced manufacturing cost simultaneously greatly.
According to the utility model discloses an at least one scheme through the reasonable high refractive index lens material that uses, effectively reduces camera lens front end overall dimension, can compatible multiple window, becomes doubly whole no vignetting.
According to the utility model discloses an at least one scheme, through reasonable lens material selection and collocation, make optical system still can guarantee good resolution ratio under high temperature 80 ℃ and low temperature-40 ℃ state, not virtual burnt under the high low temperature.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is an optical structure diagram of a wide-angle end of a zoom lens according to a first embodiment of the present invention;
fig. 2 is an optical structure diagram of a telephoto end of a zoom lens according to a first embodiment of the present invention;
fig. 3 is an optical structure diagram of a wide-angle end of the zoom lens according to the second embodiment of the present invention;
fig. 4 is an optical structure diagram of a telephoto end of the zoom lens according to the second embodiment of the present invention;
fig. 5 is an optical structure diagram of a wide-angle end of a zoom lens according to a third embodiment of the present invention;
fig. 6 is an optical structure diagram of a telephoto end of the zoom lens according to the third embodiment of the present invention.
Detailed Description
The description of the embodiments of this specification is intended to be taken in conjunction with the accompanying drawings, which are to be considered part of the complete specification. 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 well 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. 1-6, the zoom lens according to the embodiment of the present invention includes, in order from an object side to an image side along an optical axis, a compensation lens group having negative power, a diaphragm S, and a power variable lens group having positive power, the compensation lens group and the power variable lens group being movable along the optical axis, the compensation lens group includes, in order, a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4, and the power variable lens group includes, in order, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10, wherein the second lens L2 is a meniscus lens in a paraxial region, and the third lens L3 is an aspheric lens. The ultra-high definition zoom lens has the advantages of miniaturization, low cost, infrared confocal performance, excellent high and low temperature performance and wide angle end angle exceeding 136 degrees.
In a preferred embodiment of the present invention, the first lens L1 is a convex-concave glass spherical lens having a negative optical power, or a plano-concave glass spherical lens having a negative optical power, or a concave-concave glass spherical lens having a negative optical power. The second lens L2 is a paraxial region concave-convex plastic aspherical lens having positive or negative optical power. The third lens L3 is a paraxial concave plastic aspherical lens having negative refractive power. The fourth lens L4 is a paraxial convex plastic aspherical lens having positive refractive power. The fifth lens L5 is a convex glass spherical lens having positive optical power. The sixth lens L6 is a concave-convex glass spherical lens having negative optical power. The seventh lens L7 is a paraxial region convex-concave plastic aspherical lens having positive refractive power. The eighth lens L8 is a paraxial region concave plastic aspherical lens having negative power. The ninth lens L9 is a paraxial convex plastic aspherical lens having positive refractive power. The tenth lens L10 is a paraxial region concave-convex plastic aspheric lens having negative refractive power, or a paraxial region concave-flat plastic aspheric lens having negative refractive power.
Based on the arrangement, the on-axis and off-axis initial-order aberrations and various high-order aberrations of the system can be better corrected by reasonably configuring the surface type (spherical surface or aspheric surface) of each lens, so that the resolution of the zoom lens is improved, and high-definition 4K resolving power is realized. By skillfully matching the glass and the plastic lens, the back focal drift of the lens at high and low temperatures is perfectly compensated, so that the cost is reduced, and the clear imaging of the lens at the extreme temperature is ensured.
In some preferred embodiments of the present invention, the fifth lens L5 and the sixth lens L6 constitute a cemented lens group B1. The focal length F56 of the cemented lens group B1 and the focal length Fb of the variable magnification lens group satisfy the following relationship: f56/Fb is more than or equal to 1.08 and less than or equal to 1.22. Therefore, by arranging the cemented lens group and reasonably distributing the focal power of the cemented lens group, the transmissibility of light rays from the compensation lens group to the zoom lens group is further improved, the volume of the lens zoom lens group is reduced, high-efficiency zooming can be realized, and lightness and production cost reduction can be realized.
In some preferred embodiments of the present invention, abbe number vd5 of fifth lens L5 and abbe number vd6 of sixth lens L6 satisfy the following condition: vd5-vd6 of 17.96 is less than or equal to 28.14. Therefore, by reasonably configuring the Abbe number collocation of the cemented lens group, the spherical aberration and chromatic aberration of the system are corrected, the imaging sharpness of the lens is ensured, and meanwhile, the tolerance sensitivity of the lens group is reduced.
In some preferred embodiments of the present invention, the following relationship is satisfied between the compensation lens group focal length Fa and the variable power lens group focal length Fb: the absolute value Fa/Fb is more than or equal to 0.73 and less than or equal to 0.79. Therefore, the focal power among the groups is reasonably distributed, the improvement of the transmissibility of light rays is facilitated, and the focusing and zooming of the lens are better realized.
In some preferred embodiments of the present invention, a relationship between the variable power lens group focal length Fb and the wide-angle end focal length fw of the zoom lens is satisfied: fb/fw is more than or equal to 2.87 and less than or equal to 3.02; the focal length Fb of the zoom lens group and the focal length ft of the telescopic end of the zoom lens satisfy the relation: fb/ft is more than or equal to 1.14 and less than or equal to 1.20. Therefore, by reasonably setting the relationship between the focal length of the variable-power lens group and the focal lengths of the wide-angle end and the telephoto end of the lens, a large variable-power ratio is realized as far as possible under the condition of limited space, and the total length of the lens is better limited, so that the volume of the lens is reduced.
In some preferred embodiments of the present invention, the distance Δ D that the variable power lens group moves from the wide-angle end to the telephoto end of the zoom lens and the wide-angle end total optical length TTL of the zoom lens satisfy the following relation: delta D/TTL is less than or equal to 0.15. Therefore, the zoom ratio is large by using a small group interval variation, the zoom efficiency is improved, the total length of the lens is reduced, and the small size of the lens is realized.
In some preferred embodiments of the present invention, the relationship between the effective optical diameter D1 of the first lens L1 and the total optical length TTL at the wide-angle end of the zoom lens is satisfied: D1/TTL is less than or equal to 0.28. Therefore, the size of the head of the lens is reduced, and the small size is realized.
In some preferred embodiments of the present invention, the refractive index nd5 and abbe number vd5 of the fifth lens L5 satisfy the following condition: nd5 is more than or equal to 1.48 and less than or equal to 1.57; vd5 is more than or equal to 73.46 and less than or equal to 83.64. Therefore, the chromatic aberration of the lens can be further corrected by reasonably setting the material of the fifth lens, and visible and infrared complete confocal can be realized while the purple edge of the lens is well balanced.
In some preferred embodiments of the present invention, the eighth lens L8 focal length f8 and the ninth lens L9 focal length f9 satisfy the following relation: f8/f9 is more than or equal to-1.25 and less than or equal to-1.23. Therefore, the positive and negative focal power matching relationship is beneficial to aberration correction, and compensation of the zoom lens in a high-temperature and low-temperature state is effectively guaranteed.
Compared with the prior art, the embodiment of the utility model provides a have following advantage:
(1) By reasonably configuring the focal power of each lens, 3 times of zooming can be realized under the condition of limited space, and high resolution and infrared confocal are realized;
(2) The glass lenses and the plastic lenses are matched, so that various performances of the system are still ensured under the condition of using few glass lenses, and meanwhile, the production cost is greatly reduced;
(3) By reasonably using high-refractive-index lens materials, the overall size of the front end of the lens is effectively reduced, the lens is compatible with various windows, and the zooming whole process has no dark angle;
(4) By reasonable material selection and reasonable collocation of the lens, the system can still ensure good resolution ratio at the high temperature of 80 ℃ and the low temperature of-40 ℃, and the lens is free from virtual focus at the high temperature and the low temperature.
The zoom lens of the present invention is specifically described below with reference to three embodiments in conjunction with the drawings and tables. In the following embodiments, the stop S is described as one surface, and the image surface IMA is described as one surface.
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 of the height y perpendicular to the optical axis 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 aspherical coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders are expressed respectively.
Example one
As shown in fig. 1-2, in the first embodiment, the focal length of the zoom lens is 3.59-9.02 mm; the number F of the zoom lens is 1.77-3.24; the wide-angle end optical total length of the zoom lens is 47.90mm; the wide-angle end angle of the zoom lens is 136.5 °.
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 as follows (table 2):
table 2 in the first embodiment, the K value and aspheric coefficient of the zoom lens are as follows (table 3):
| number of noodles | Value of K | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 3 | 33.14 | -4.30E-04 | -2.77E-05 | 1.61E-06 | 1.34E-08 | -1.48E-09 | 2.48E-11 | 2.08E-13 |
| 4 | -99.00 | -2.31E-03 | 4.04E-05 | 3.92E-07 | -1.08E-08 | 2.34E-10 | -1.24E-11 | -5.64E-14 |
| 5 | -2.39 | -1.27E-03 | 6.38E-05 | -3.50E-06 | 7.35E-08 | 1.12E-09 | -7.04E-11 | 5.05E-13 |
| 6 | 4.45 | -1.01E-03 | 3.54E-05 | -2.51E-06 | 1.41E-08 | 1.82E-09 | 1.17E-12 | -1.36E-12 |
| 7 | -8.58 | -2.78E-04 | 3.57E-06 | 1.10E-06 | -1.78E-08 | -8.24E-10 | 6.95E-11 | -1.91E-12 |
| 8 | 96.49 | -4.25E-05 | -5.20E-06 | 4.00E-07 | 1.97E-08 | -2.17E-10 | -8.62E-12 | -6.23E-13 |
| 13 | 6.22 | -3.37E-03 | -6.15E-05 | 5.80E-06 | 3.09E-07 | 7.72E-09 | -2.02E-09 | 4.44E-11 |
| 14 | -18.39 | -2.19E-03 | -3.98E-06 | 7.22E-06 | 1.48E-07 | 4.89E-08 | -2.71E-10 | -1.66E-11 |
| 15 | 99.00 | 2.88E-03 | -8.36E-05 | -4.78E-06 | 3.69E-07 | 1.79E-08 | 4.39E-09 | -3.26E-10 |
| 16 | 7.83 | 1.34E-03 | -1.57E-05 | -1.33E-05 | -8.23E-08 | 1.35E-07 | 1.24E-08 | -1.83E-09 |
| 17 | -7.95 | 1.14E-03 | -1.04E-04 | 5.89E-06 | 2.08E-07 | 1.22E-07 | 6.21E-09 | -1.30E-09 |
| 18 | 61.50 | -6.36E-04 | -4.60E-06 | -4.47E-07 | 5.01E-07 | 5.93E-08 | -3.25E-08 | 3.21E-09 |
| 19 | -99.00 | -1.03E-03 | 6.43E-06 | -1.09E-05 | 7.06E-07 | -2.39E-07 | -2.90E-09 | 2.40E-09 |
| 20 | -99.00 | 3.27E-05 | -4.41E-05 | 2.15E-07 | -9.96E-07 | 8.46E-09 | 1.19E-09 | 3.18E-10 |
TABLE 3
In the first embodiment, when the wide angle end of the zoom lens is changed to the telephoto end, the variable interval values (i.e., D1, D2, and D3 in table 2 of 5) are as follows (table 4):
| number of noodles | Thickness of | Wide angle end | Telescope end |
| 8 | D1 | 9.39 | 2.58 |
| 9 | D2 | 7.92 | 0.86 |
| 20 | D3 | 4.87 | 11.94 |
TABLE 4
With reference to fig. 1-2 and tables 1-4, in the present embodiment, by reasonably configuring the focal power, shape and optical parameters of the lens, the ultra-high definition zoom lens with small size, low cost, infrared confocal property, excellent high and low temperature performance and wide angle end angle exceeding 136 ° can be realized.
Example two
As shown in fig. 3-4, in the second embodiment, the focal length of the zoom lens is 3.48-8.79 mm; the number F of the zoom lens is 1.75-3.21; the wide-angle end optical total length of the zoom lens is 47.79mm; the wide-angle end angle of the zoom lens is 136.5 °.
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 as follows (table 5):
| number of noodles | Surface type | Radius of curvature R | Thickness d | Refractive index Nd | Abbe number Vd |
| 1 | Spherical surface | -300.00 | 0.60 | 2.00 | 29.1 |
| 2 | Spherical surface | 7.09 | 3.08 | ||
| 3 | Aspherical surface | -32.67 | 1.52 | 1.64 | 23.5 |
| 4 | Aspherical surface | -30.20 | 0.08 | ||
| 5 | Aspherical surface | -21.91 | 1.24 | 1.54 | 56.0 |
| 6 | Aspherical surface | 12.80 | 0.06 | ||
| 7 | Aspherical surface | 11.43 | 1.98 | 1.66 | 20.4 |
| 8 | Aspherical surface | -60.73 | D1 | ||
| 9(S) | Spherical surface | Infinity | D2 | ||
| 10 | Spherical surface | 7.56 | 5.74 | 1.55 | 75.5 |
| 11 | Spherical surface | -5.57 | 0.60 | 1.70 | 55.5 |
| 12 | Spherical surface | -15.25 | 0.06 | ||
| 13 | Aspherical surface | 11.63 | 1.35 | 1.54 | 56.0 |
| 14 | Aspherical surface | 14.17 | 0.29 | ||
| 15 | Aspherical surface | -35.48 | 2.21 | 1.64 | 23.4 |
| 16 | Aspherical surface | 12.31 | 0.06 | ||
| 17 | Aspherical surface | 7.10 | 3.58 | 1.54 | 56.0 |
| 18 | Aspherical surface | -32.34 | 0.66 | ||
| 19 | Aspherical surface | -26.02 | 1.46 | 1.61 | 25.6 |
| 20 | Aspherical surface | 791.42 | D3 | ||
| 21 | Spherical surface | Infinity | 0.7 | 1.52 | 64.2 |
| 22 | Spherical surface | Infinity | 0.1 | ||
| 23(IMA) | Spherical surface | Infinity | - | - | - |
Table 5 in the second embodiment, the K value and aspheric coefficient of the zoom lens are as follows (table 6):
TABLE 6
In the second embodiment, when the wide angle end of the zoom lens is changed to the telephoto end, the numerical value of the interval is changed (i.e., the value of the interval is changed)
D1, D2 and D3 in table 2) see the following table (table 7):
| noodle sequence number | Thickness of | Wide angle end | The telescope end |
| 8 | D1 | 9.67 | 2.67 |
| 9 | D2 | 7.87 | 0.79 |
| 20 | D3 | 4.88 | 11.95 |
TABLE 7
With reference to fig. 3-4 and tables 1 and 5-7, in this embodiment, by reasonably configuring the focal power, shape and optical parameters of the lens, the ultra-high definition zoom lens with small size, low cost, infrared confocal property, excellent high and low temperature performance and wide angle end angle exceeding 136 ° can be realized.
EXAMPLE III
As shown in fig. 5-6, in embodiment three, the focal length of the zoom lens is 3.54 to 9.01mm; the number F of the zoom lens is 1.76-3.22; the wide-angle end optical total length of the zoom lens is 47.90mm; the wide-angle end angle of the zoom lens is 136.5 °.
In the third 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 as follows (table 8):
table 8 in the second embodiment, the K value and aspheric coefficient of the zoom lens are as follows (table 9):
| noodle sequence number | Value of K | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 3 | 20.44 | 6.65E-05 | -3.97E-05 | 2.07E-06 | -1.59E-08 | -1.71E-22 | -1.31E-25 | 0.00E+00 |
| 4 | -25.86 | -1.79E-03 | 3.27E-05 | 2.48E-07 | -1.41E-08 | -1.55E-22 | -1.25E-25 | 0.00E+00 |
| 5 | -2.45 | -1.23E-03 | 7.36E-05 | -3.58E-06 | 4.83E-08 | 9.88E-10 | -4.40E-11 | 7.15E-13 |
| 6 | 7.38 | -1.03E-03 | 4.23E-05 | -2.61E-06 | 1.90E-08 | 1.81E-09 | -5.85E-12 | -1.35E-12 |
| 7 | -5.75 | -2.23E-04 | 4.53E-06 | 1.26E-06 | -1.70E-08 | -9.88E-10 | 6.63E-11 | -1.63E-12 |
| 8 | 59.09 | 5.30E-05 | -4.11E-07 | 4.70E-07 | 1.85E-08 | -1.18E-10 | -6.33E-12 | -4.85E-13 |
| 13 | 6.24 | -3.12E-03 | -6.45E-05 | 4.83E-06 | 2.91E-07 | 1.02E-08 | -1.78E-09 | 3.35E-11 |
| 14 | -34.01 | -2.48E-03 | -1.33E-05 | 8.49E-06 | 2.17E-07 | 4.09E-08 | -9.54E-10 | -3.79E-11 |
| 15 | 98.69 | 2.69E-03 | -7.33E-05 | -4.84E-06 | 3.53E-07 | 1.55E-08 | 4.37E-09 | -3.70E-10 |
| 16 | 8.06 | 1.48E-03 | -2.13E-05 | -1.64E-05 | -2.11E-07 | 1.20E-07 | 1.09E-08 | -1.32E-09 |
| 17 | -8.09 | 1.30E-03 | -1.11E-04 | 3.62E-06 | 1.54E-07 | 8.40E-08 | 8.61E-09 | -9.83E-10 |
| 18 | 86.83 | -6.48E-04 | -3.24E-05 | -2.28E-06 | 8.35E-07 | 1.01E-07 | -3.72E-08 | 2.82E-09 |
| 19 | -98.37 | -1.76E-03 | -3.95E-05 | -3.71E-06 | 7.37E-07 | -1.90E-07 | -4.74E-09 | 1.66E-09 |
| 20 | 72.60 | -8.10E-04 | -6.16E-06 | 5.89E-07 | -7.53E-07 | 5.19E-08 | -4.35E-09 | 3.24E-10 |
TABLE 9
In the third embodiment, the variable interval value (i.e., the variable interval value) when the wide angle end of the zoom lens is changed to the telephoto end
D1, D2 and D3 in table 2) see the following table (table 10):
| number of noodles | Thickness of | Wide angle end | Telescope end |
| 8 | D1 | 9.91 | 2.53 |
| 9 | D2 | 7.83 | 0.75 |
| 20 | D3 | 4.81 | 11.89 |
Watch 10
As shown in fig. 5-6 and tables 1 and 8-10, the present embodiment can implement a compact, low-cost, ultra-high definition zoom lens with infrared confocal property, excellent high and low temperature performance, and a wide-angle end angle exceeding 136 ° by reasonably configuring the power, shape and optical parameters of the lens.
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. The zoom lens sequentially comprises a compensation lens group with negative focal power, a diaphragm (S), a zoom lens group with positive focal power and a flat plate (CG) from the object side to the image side along an optical axis, wherein the compensation lens group and the zoom lens group can move along the optical axis, the compensation lens group sequentially comprises a first lens (L1), a second lens (L2), a third lens (L3) and a fourth lens (L4), and the zoom lens group sequentially comprises a fifth lens (L5), a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), a ninth lens (L9) and a tenth lens (L10), and is characterized in that the second lens (L2) is a paraxial region meniscus lens, and the third lens (L3) is an aspheric lens.
2. A zoom lens according to claim 1, characterized in that the first lens (L1) and the third lens (L3) optical power are negative, the second lens (L2) optical power is positive or negative, and the fourth lens (L4) optical power is positive.
3. A zoom lens according to claim 1, wherein the optical powers of the fifth lens (L5), the seventh lens (L7) and the ninth lens (L9) are positive, and the optical powers of the sixth lens (L6), the eighth lens (L8) and the tenth lens (L10) are negative.
4. A zoom lens according to claim 1, wherein the first lens (L1) is a convex-concave or plano-concave or concave-concave lens, the third lens (L3) and the eighth lens (L8) are paraxial region concave lenses, the fourth lens (L4) and the ninth lens (L9) are paraxial region convex-convex lenses, the fifth lens (L5) is a convex-convex lens, the sixth lens (L6) is a concave-convex lens, the seventh lens (L7) is a paraxial region convex-concave lens, and the tenth lens (L10) is a paraxial region concave-concave or concavo-convex or concave-convex lens.
5. The zoom lens according to claim 1, wherein the second lens (L2), the third lens (L3), the fourth lens (L4), the seventh lens (L7), the eighth lens (L8), the ninth lens (L9), and the tenth lens (L10) are all plastic aspherical lenses.
6. A zoom lens according to any one of claims 1 to 5, wherein the following relationship is satisfied between the compensation lens group focal length Fa and the variable magnification lens group focal length Fb:
0.73≤|Fa/Fb|≤0.79。
7. a zoom lens according to any one of claims 1 to 5, wherein the relationship between the variable power lens group focal length Fb and a wide-angle end focal length fw of the zoom lens satisfies:
2.87≤Fb/fw≤3.02；
the focal length Fb of the zoom lens group and the focal length ft of the telephoto end of the zoom lens satisfy the relation:
1.14≤Fb/ft≤1.20。
8. a zoom lens according to any one of claims 1 to 5, wherein a distance Δ D by which the variable power lens group is moved from a wide-angle end to a telephoto end of the zoom lens and a wide-angle end optical total length TTL of the zoom lens satisfy the relation:
ΔD/TTL≤0.15。
9. a zoom lens according to any one of claims 1 to 5, wherein the relation between the optically effective diameter D1 of the first lens (L1) and the total optical length TTL at the wide angle end of the zoom lens is satisfied:
D1/TTL≤0.28。
10. a zoom lens according to any one of claims 1 to 5, characterized in that the fifth lens (L5) and the sixth lens (L6) constitute a cemented lens group (B1).
11. The zoom lens according to claim 10, wherein a focal length F56 of the cemented lens group (B1) and the variable power lens group focal length Fb satisfy the following relationship:
1.08≤F56/Fb≤1.22。
12. a zoom lens according to any one of claims 1 to 5, characterized in that the refractive index nd5 and the Abbe number vd5 of the fifth lens (L5) satisfy the following conditions:
1.48≤nd5≤1.57；
73.46≤vd5≤83.64。
13. a zoom lens according to any one of claims 1 to 5, characterized in that the Abbe number vd5 of the fifth lens (L5) and the Abbe number vd6 of the sixth lens (L6) satisfy the following condition:
17.96≤vd5-vd6≤28.14。
14. the zoom lens according to any one of claims 1 to 5, wherein the focal length f8 of the eighth lens (L8) and the focal length f9 of the ninth lens (L9) satisfy the following relationship:
-1.25≤f8/f9≤-1.23。
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| CN115453724A (en) * | 2022-09-16 | 2022-12-09 | 舜宇光学(中山)有限公司 | Zoom lens |
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| CN115453724A (en) * | 2022-09-16 | 2022-12-09 | 舜宇光学(中山)有限公司 | Zoom lens |
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