CN113534426A - Zoom lens - Google Patents
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- CN113534426A CN113534426A CN202110871809.1A CN202110871809A CN113534426A CN 113534426 A CN113534426 A CN 113534426A CN 202110871809 A CN202110871809 A CN 202110871809A CN 113534426 A CN113534426 A CN 113534426A
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- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 10
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
- G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
- G02B15/145129—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+++
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
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Abstract
The invention relates to a zoom lens, which comprises a first lens group (G1) with positive focal power, a second lens group (G2) with negative focal power, a STOP (STOP), a third lens group (G3) with positive focal power, a fourth lens group (G4) with positive focal power and a fifth lens group (G5) with positive focal power, wherein the second lens group (G2) can move from the object side to the long focal end along the optical axis to achieve zooming from the wide angle end to the long focal end, the fourth lens group (G4) can move along the optical axis to correct the change of an image surface position in the zooming process, the second lens group (G2) is composed of four lenses, and the fifth lens group (G5) is composed of one lens. The zoom lens has the characteristics of large multiplying power, wide visual field, low cost and resolution ratio of more than 4 k.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a zoom lens.
Background
With the development of chip technologies such as CCD or CMOS and the like and the improvement of the image quality requirements of people for video conferences, the requirements for the imaging quality of the matched optical system are also higher and higher. In order to meet such a trend, optical lenses mounted on video conference products are also required to have performance such as high resolution, large magnification, and low distortion. However, the existing large-power zoom lens still has some performance defects, so that the use scenes of the existing large-power zoom lens are limited. For example, the wide-angle end angle is not large enough, resulting in a limited shooting range; the magnification of the telephoto end is not large enough, so that the amplification effect is insufficient; the range of the focusable object distance is not wide enough, so that the use scene is limited; the aperture is small, so that the shooting requirement of a low-illumination environment cannot be met; insufficient resolution, resulting in low resolution, etc.
Disclosure of Invention
The invention aims to provide a zoom lens.
In order to achieve the above object, the present invention provides a zoom lens, including a first lens group having positive refractive power, a second lens group having negative refractive power, a stop, a third lens group having positive refractive power, a fourth lens group having positive refractive power, and a fifth lens group having positive refractive power, which are arranged in order from an object side to an image side along an optical axis, wherein the second lens group is movable from the object side to the image side along the optical axis to perform zooming from a wide-angle end to a telephoto end, the fourth lens group is movable along the optical axis to correct a change in an image plane position during zooming, the second lens group is composed of four lenses, and the fifth lens group is composed of one lens.
According to one aspect of the present invention, the first lens group has at least two positive lenses and one negative lens;
the lens of the first lens group closest to the object side is a convex-concave lens, and the focal power is negative.
According to an aspect of the present invention, the second lens group has at least one positive lens, two negative lenses, and a plastic lens;
the lens closest to the object side of the second lens group is a convex-concave lens, and the focal power is negative.
According to an aspect of the invention, the third lens group comprises three lenses, wherein at least one of the three lenses comprises a positive lens, a negative lens and a plastic lens;
the focal power of the lens closest to the image side of the third lens group is negative, and the image side surface is a concave surface.
According to an aspect of the invention, the fourth lens group has at least two positive lenses and one negative lens;
in the fourth lens group, the focal power of the lens closest to the object side is positive; the power of the lens closest to the image side is negative, and the image side surface is concave.
According to one aspect of the invention, the lens powers in the fifth lens group are positive and the image side paraxial region is convex.
According to one aspect of the invention, the following relation is satisfied:
4.5≤(d12t-d12w)/fw≤10；
wherein d is12tThe distance between the last surface of the first lens group and the first surface of the second lens group when the zoom lens is at the telephoto end, d12wAnd fw is a distance from the last surface of the first lens group to the first surface of the second lens group when the zoom lens is at a wide-angle end, and fw is a focal length of the zoom lens at the wide-angle end.
According to one aspect of the invention, the following relation is satisfied:
2≤TTL/(d12t-d12w)≤4；
wherein d is12tThe distance between the last surface of the first lens group and the first surface of the second lens group when the zoom lens is at the telephoto end, d12wAnd when the zoom lens is at a wide-angle end, the distance from the last surface of the first lens group to the first surface of the second lens group is represented by TTL, and the distance from the first surface of the first lens group to an imaging surface is represented by TTL.
According to an aspect of the present invention, a focal length f2 of the second lens group and a focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: the | f2| fw is more than or equal to 1 and less than or equal to 4.
According to an aspect of the present invention, a focal length f3 of the third lens group and a focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: f3/fw is more than or equal to 4 and less than or equal to 8.
According to one aspect of the invention, the following relation is satisfied:
30≤|V1is just-V1Negative pole|≤75；
Wherein, V1Is justAbbe number of a positive lens close to the object side in the first lens group, V1Negative poleIs the abbe number of the negative lens in the first lens group.
According to an aspect of the invention, at least two lenses of the second lens group are made of high refractive index glass, and the refractive index NDiThe following conditions are satisfied: NDi≥1.75。
According to an aspect of the invention, at least one lens of the third lens group is made of low dispersion glass and has an abbe number VDjAnd refractive index NDjThe following conditions are respectively satisfied: VD is not less than 65j≤100；1.4≤NDj≤1.60。
According to the scheme of the invention, the glass-plastic mixed zoom lens with large multiplying power, large aperture, wide visual field, low cost and resolution of more than 4k is provided, the positive and negative of the focal power of each group of the zoom lens are reasonably configured, so that the multiplying power variation range can reach 18-30 times, and the zoom lens can be used in video conference occasions.
According to one scheme of the invention, the second lens group consists of four lenses, so that clear imaging of the lens in the whole zooming process and consistency of image quality in the zooming process can be ensured, and meanwhile, aberration and tolerance sensitivity at the wide-angle end can be reduced.
According to one aspect of the present invention, by reasonably setting the relationship between the distance from the last surface of the first lens group to the first surface of the second lens group at the telephoto end and the wide-angle end of the zoom lens and the focal length at the wide-angle end of the zoom lens, it is possible to avoid an increase in aberration generated between one group and two groups, a decrease in lens resolving power, an increase in lens volume, and an increase in design cost.
According to one aspect of the present invention, by reasonably setting the relationship between the distance from the last surface of the first lens group to the first surface of the second lens group at the telephoto end and the wide-angle end of the zoom lens and the total length of the zoom lens, it is possible to avoid an increase in the volume of the zoom lens, an increase in the design cost, a low zoom efficiency, an increase in the aberration generated between one group and two groups, a decrease in the resolving power of the zoom lens, and a deterioration in the group tolerance sensitivity.
According to one scheme of the invention, by reasonably setting the relationship between the focal length of the second lens group and the focal length of the wide-angle end of the lens, the problem that the aberration balance at the telephoto end is limited, the resolution is difficult to improve, and the lens cannot meet the requirements of large-magnification zooming and small volume at the same time can be avoided.
According to one scheme of the invention, by reasonably setting the relationship between the focal length of the third lens group and the focal length of the wide-angle end of the lens, the tolerance sensitivity of the third lens group can be prevented from being poor, the resolution consistency of a product is poor, and the volume (length) of the lens is increased, so that the small volume of the lens is favorably realized.
According to one aspect of the present invention, by reasonably setting the relationship between the abbe number of the positive lens close to the object side in the first lens group and the abbe number of the negative lens in the first lens group, the chromatic aberration at the wide-angle end and the telephoto end can be corrected, and the chromatic aberration in the whole zoom process can be reasonably balanced.
According to an aspect of the present invention, the second lens group includes two or more pieces of high refractive index glass, and the refractive index of the high refractive index lenses is larger than a certain value, so that curvature of field and astigmatism generated by a large incident angle light at the wide-angle end can be effectively reduced, and the resolving power at the wide-angle end can be comprehensively improved.
According to one scheme of the invention, the third lens group comprises more than one piece of low dispersion glass, and the refractive index and the abbe number of the low dispersion lens meet certain conditions, so that chromatic aberration generated by the first lens group and the second lens group can be reasonably balanced, and the resolution of the whole zooming process is comprehensively improved.
Drawings
Fig. 1 and 2 schematically show configuration views of a zoom lens according to a first embodiment of the present invention at a wide angle end (W) and a telephoto end (T) when an object distance is infinity, respectively;
fig. 3 schematically shows positional chromatic aberration (left), chromatic aberration of magnification (middle), and distortion diagram (right) at the wide-angle end (W) when the object distance is infinity in a zoom lens according to the first embodiment of the present invention;
fig. 4 schematically shows positional chromatic aberration (left), chromatic aberration of magnification (middle), distortion diagram (right) of a long focal end (T) of a zoom lens according to a first embodiment of the present invention at an object distance of infinity;
fig. 5 and 6 schematically show configuration views of a wide angle end (W) and a telephoto end (T), respectively, when an object distance is infinity, in a zoom lens according to a second embodiment of the present invention;
fig. 7 schematically shows positional chromatic aberration (left), chromatic aberration of magnification (middle), and distortion diagram (right) at the wide-angle end (W) when the object distance is infinity in a zoom lens according to the second embodiment of the present invention;
fig. 8 schematically shows positional chromatic aberration (left), chromatic aberration of magnification (middle), distortion diagram (right) of a long focal end (T) of a zoom lens according to a second embodiment of the present invention at an object distance of infinity;
fig. 9 and 10 schematically show configuration views of a wide angle end (W) and a telephoto end (T), respectively, at an object distance of infinity, in a zoom lens according to a third embodiment of the present invention;
fig. 11 schematically shows positional chromatic aberration (left), chromatic aberration of magnification (middle), and distortion diagram (right) at the wide-angle end (W) when the object distance is infinity in a zoom lens according to the third embodiment of the present invention;
fig. 12 schematically shows positional chromatic aberration (left), chromatic aberration of magnification (middle), and distortion diagram (right) of a long focal end (T) of a zoom lens according to a third embodiment of the present invention at an object distance of infinity;
fig. 13 and 14 schematically show configuration views of a wide angle end (W) and a telephoto end (T), respectively, of a zoom lens according to a fourth embodiment of the present invention when an object distance is infinity;
fig. 15 schematically shows positional chromatic aberration (left), chromatic aberration of magnification (middle), and distortion diagram (right) at the wide-angle end (W) when the object distance is infinity, in a zoom lens according to the fourth embodiment of the present invention;
fig. 16 schematically shows positional chromatic aberration (left), chromatic aberration of magnification (middle), and distortion diagram (right) of a long focal end (T) of a zoom lens according to a fourth embodiment of the present invention at an object distance of infinity;
fig. 17 and 18 schematically show configuration views of a wide angle end (W) and a telephoto end (T), respectively, when an object distance is infinity, in a zoom lens according to a fifth embodiment of the present invention;
fig. 19 schematically shows chromatic positional aberration (left), chromatic aberration of magnification (middle), and distortion diagram (right) at the wide-angle end (W) when the object distance is infinity in a zoom lens according to the fifth embodiment of the present invention;
fig. 20 schematically shows positional chromatic aberration (left), chromatic aberration of magnification (middle), and distortion diagram (right) of a focal end (T) of a zoom lens according to a fifth embodiment of the present invention at an object distance of infinity.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
Referring to fig. 1, the zoom lens of the present invention includes, in order from an object side to an image side along an optical axis, a first lens group G1 having positive optical power, a second lens group G2 having negative optical power, a STOP, a third lens group G3 having positive optical power, a fourth lens group G4 having positive optical power, and a fifth lens group G5 having positive optical power. The second lens group G2 can move along the optical axis from the object side to the image side to achieve the zoom from the wide-angle end to the telephoto end, and the fourth lens group G4 can move along the optical axis to correct the variation of the image plane position during the zoom process. In the present invention, the second lens group G2 is composed of four lenses, and the fifth lens group G5 is composed of one lens. Therefore, the zoom lens can realize a large magnification variation range of 18-30 times.
In the present invention, the first lens group G1 includes at least two positive lenses and one negative lens. The lens closest to the object side of the first lens group G1 is a concave-convex lens, and the optical power is negative. Specifically, the first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3 arranged in order from the object side to the image side along the optical axis.
In the present invention, the second lens group G2 has at least one positive lens, two negative lenses, and one plastic lens. The lens closest to the object side of the second lens group G2 is a concave-convex lens, and the power is negative. Specifically, the second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7, which are arranged in order from the object side to the image side along the optical axis.
In the present invention, the third lens group G3 comprises three lenses, wherein at least one lens is a positive lens, a negative lens, and a plastic lens. The power of the lens closest to the image side of the third lens group G3 is negative, and the image side surface is concave. Specifically, the third lens group G3 includes an eighth lens L8, a ninth lens L9, and a tenth lens L10 arranged in order from the object side to the image side along the optical axis.
In the present invention, the fourth lens group G4 includes at least two positive lenses and one negative lens. In the fourth lens group G4, the power of the lens closest to the object side is positive; the focal power of the lens closest to the image side is negative, and the image side surface of the lens is concave. Specifically, the fourth lens group G4 includes an eleventh lens L11, a twelfth lens L12, and a thirteenth lens L13 arranged in order from the object side to the image side along the optical axis.
In the present invention, the power of the fifth lens group G5 is positive, and the image-side paraxial region is convex. Specifically, the fifth lens group G5 includes only the fourteenth lens L14.
In the present invention, the zoom lens satisfies the following relational expression: 4.5 (d) or less12t-d12w) The/fw is less than or equal to 10. Wherein d is12tThe distance from the last surface of the first lens group G1 to the first surface of the second lens group G2 at the telephoto end of the zoom lens, d12wThe distance from the last surface of the first lens group G1 to the first surface of the second lens group G2 when the zoom lens is at the wide-angle end, and fw is the focal length at the wide-angle end of the zoom lens. If the lower limit of the relational expression is smaller, the aberration generated between the first lens group G1 and the second lens group G2 increases, and the lens resolving power decreases; if the upper limit of the relation is larger, the lens volume increases and the design cost increases.
In the present invention, the zoom lens satisfies the following relational expression: TTL/(d) of 2 ≤12t-d12w) Less than or equal to 4. Wherein d is12tThe distance from the last surface of the first lens group G1 to the first surface of the second lens group G2 at the telephoto end of the zoom lens, d12wThe distance from the last surface of the first lens group G1 to the first surface of the second lens group G2 when the zoom lens is at the wide-angle end, and TTL is the distance from the first surface of the first lens group G1 to the imaging surface. When the lower limit of the relational expression is smaller, the volume of the lens is increased, the design cost is increased, and the zooming efficiency is low; if the aberration generated between the first lens group G1 and the second lens group G2 is larger than the upper limit of the relationship, the resolution of the lens is reduced, and the sensitivity of the group tolerance is deteriorated.
In the present invention, the focal length f2 of the second lens group G2 and the focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: the | f2| fw is more than or equal to 1 and less than or equal to 4. When the aberration is smaller than the lower limit of the relational expression, the aberration balance at the telephoto end is limited, and the resolution is difficult to improve; if the value is larger than the upper limit value of the relational expression, the lens cannot meet the requirements of large-magnification zooming and small volume.
In the present invention, the focal length f3 of the third lens group G3 and the focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: f3/fw is more than or equal to 4 and less than or equal to 8. If the value is less than the lower limit of the relational expression, the tolerance sensitivity of the third lens group G3 will be poor, and the resolution consistency of the product will be poor; if the value is larger than the upper limit of the relational expression, the volume (length) of the lens is increased, which is not favorable for realizing a small volume of the lens.
In the present invention, the zoom lens satisfies the following relational expression: v1 less than or equal to 30Is just-V1Negative poleThe | is less than or equal to 75. Wherein, V1Is justAbbe number (relative to d-ray) of the positive lens near the object side in the first lens group G1, V1Negative poleThe abbe number (with respect to d-ray) of the negative lens in the first lens group G1. The relation is satisfied, the correction of chromatic aberration of the wide-angle end and the telephoto end can be realized, and the reasonable balance of chromatic aberration of the whole zooming process is achieved.
In the present invention, at least two lenses of the second lens group G2 are made of high refractive index glass and have a refractive index NDiThe following conditions are satisfied: NDiNot less than 1.75. The method can effectively reduce the field curvature and astigmatism generated by the large incident angle light at the wide-angle end and comprehensively improve the resolution at the wide-angle end.
In the present invention, at least one lens in the third lens group G3 is made of low dispersion glass and has an Abbe number VDjAnd refractive index NDjThe following conditions are respectively satisfied: VD is not less than 65j≤100；1.4≤NDjLess than or equal to 1.60. The introduction of the low dispersion glass can reasonably balance chromatic aberration generated by the first lens group and the second lens group, and comprehensively improve the resolution of the whole zooming process.
In conclusion, the zoom lens adopts a glass-plastic mixed lens structure, and the anomalous dispersion glass and the high-refractive-index glass are reasonably distributed, so that the high-quality imaging effect is achieved, and the design cost is reduced while the larger magnification is ensured. The lens has excellent resolving power, the resolution ratio is more than 4K, the wide visual field range of the wide angle end is wide and can reach more than 70 degrees, the magnification of the telephoto end is high, the lens has a large magnification effect on a shot object, the magnification variation ratio is high, and the magnification variation range can reach 18X-30X from the wide angle end to the telephoto end. Moreover, the distortion of the zoom lens in the whole zooming process is low, and the deformation of a shot picture is small. The focusing range of the object distance is wide, the object distance can be clearly focused from 0.1m to infinity in the whole zooming process, and the imaging effect is good. In addition, the lens unit has better assembly tolerance and good manufacturability.
The zoom lens of the present invention is specifically described below in a five-group embodiment. In each of the following embodiments, the surface of each lens is represented by surf1, surf2, …, and surfN, and the STOP is denoted as STOP. The aspherical formula is as follows:
in the formula, z is the axial distance from the curved surface to the vertex at the position which is along the direction of the optical axis and is vertical to the optical axis by the height h; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a. the4、A6、A8、A10、A12、A14、A16Respectively representing aspheric coefficients of fourth order, sixth order, eighth order, twelfth order, fourteen order and sixteenth order.
The parameters of each embodiment specifically satisfying the above conditional expressions are shown in table 1 below:
TABLE 1
First embodiment
Referring to fig. 1 and 2, in the present embodiment, TTL is 101.81 mm; fno (wide) 1.60; wide-angle end focal length fw is 4.558 mm; the tele end focal length ft is 92.664 mm. The fourth lens L4 and the seventh lens L7 of the second lens group G2 are made of high refractive index glass, and the refractive indexes thereof are respectively as follows: nd (neodymium)L4＝1.91；NdL72.00. The eighth lens L8 of the third lens group G3 is made of low dispersion glass, and has a refractive index and an abbe number: nd (neodymium)L8＝1.44；VdL8＝95.10。
The parameters of each lens of the zoom lens according to the present embodiment include a surface Type (Type), a Radius of curvature (Radius), a Thickness (Thickness), a refractive index (Nd) of a material, an abbe number (Vd), and a Semi-Diameter (Semi-Diameter), as shown in table 2 below:
| Surface | Type | Radius | Thickness | Nd | Vd |
| surf1 | standard | 55.94 | 1.00 | 1.81 | 25.50 |
| surf2 | standard | 36.15 | 5.78 | 1.44 | 95.10 |
| surf3 | standard | 500.00 | 0.12 | ||
| surf4 | standard | 39.85 | 3.75 | 1.76 | 52.30 |
| surf5 | standard | 141.97 | d5 is movable | ||
| surf6 | standard | 40.91 | 1.15 | 1.91 | 35.30 |
| surf7 | standard | 7.12 | 3.17 | ||
| surf8 | evenasphere | 8.32 | 1.74 | 1.53 | 56.00 |
| surf9 | evenasphere | 9.11 | 3.25 | ||
| surf10 | standard | -15.82 | 1.26 | 1.71 | 53.90 |
| surf11 | standard | 17.61 | 2.66 | 2.00 | 19.30 |
| surf12 | standard | -45.58 | D12 is movable | ||
| Stop | standard | Infinity | 2.25 | ||
| surf14 | standard | 13.18 | 5.22 | 1.44 | 95.10 |
| surf15 | standard | -36.85 | 1.32 | ||
| surf16 | evenasphere | -51.80 | 1.50 | 1.54 | 55.70 |
| surf17 | evenasphere | -25.41 | 1.14 | ||
| surf18 | standard | 66.16 | 1.00 | 1.91 | 35.30 |
| surf19 | standard | 27.15 | D19 is movable | ||
| surf20 | standard | 26.43 | 3.04 | 1.62 | 63.40 |
| surf21 | standard | -36.43 | 0.50 | ||
| surf22 | standard | 34.09 | 2.64 | 1.62 | 63.40 |
| surf23 | standard | -45.53 | 1.50 | 1.92 | 20.90 |
| surf24 | standard | 45.53 | D24 is movable | ||
| surf25 | evenasphere | -26.02 | 1.12 | 1.53 | 56.00 |
| surf26 | evenasphere | -22.99 | 7.54 |
TABLE 2
The parameters of the aspherical lens in the zoom lens according to the present embodiment are shown in table 3 below:
| conic | 4th | 6th | 8th | 10th | 12th | |
| surf8 | 0 | -3.78E-04 | 1.05E-06 | -3.75E-07 | 8.74E-09 | -1.57E-10 |
| surf9 | 0 | -5.74E-04 | 1.64E-07 | -3.62E-07 | 4.51E-09 | -5.43E-11 |
| surf16 | 0 | -1.19E-05 | 1.25E-06 | 4.67E-08 | -5.15 | |
| surf17 | ||||||
| 0 | 1.17E-04 | 2.25E-06 | 5.34E-08 | -4.46 | ||
| surf25 | ||||||
| 0 | 8.72E-04 | 1.74E-05 | -5.21E-07 | -1.72E-08 | 7.35 | |
| surf26 | ||||||
| 0 | 1.07E-03 | 1.68E-05 | -1.45E-07 | -3.98E-08 | 1.25E-09 |
TABLE 3
The zoom lens according to the present embodiment has the magnification-varying data shown in table 4 below:
| Thickness | wide angle end | Long coke end |
| D5 | 1.00 | 36.54 |
| D12 | 36.54 | 1.00 |
| D19 | 4.58 | 2.17 |
| D24 | 7.04 | 9.45 |
TABLE 4
As can be seen from fig. 3 and 4, the zoom lens of the present embodiment achieves synchronous correction of aberration and chromatic aberration at low cost by reasonable arrangement of structures between the groups and between the single lenses in the groups, thereby achieving high-quality imaging of the full focus. The zoom lens has the advantages of large zoom magnification, low distortion, wide range of focusable object distance, wide visual field range at the wide-angle end and the like.
Second embodiment
Referring to fig. 5 and 6, in the present embodiment, TTL is 113.76 mm; fno (wide) 1.80; wide-angle end focal length fw is 3.722 mm; the tele end focal length ft is 92.368 mm. The fourth lens L4, the sixth lens L6, and the seventh lens L7 of the second lens group G2 are made of high refractive index glass, and the refractive indexes of the fourth lens L4, the sixth lens L6, and the seventh lens L7 are: nd (neodymium)L4＝1.85；NdL6＝1.77；NdL71.92. The eighth lens L8 of the third lens group G3 is made of low dispersion glass, and has a refractive index and an abbe number: nd (neodymium)L8＝1.46；VdL8＝90.2。
The parameters of each lens of the zoom lens according to the present embodiment include surface Type (Type), Radius of curvature (Radius), Thickness (Thickness), refractive index (Nd) of material, abbe number (Vd), and Semi-Diameter (Semi-Diameter), as shown in table 5 below:
| Surface | Type | Radius | Thickness | Nd | Vd |
| surf1 | standard | 85.94 | 1.00 | 1.85, | 23.8, |
| surf2 | standard | 46.15 | 5.78 | 1.59, | 68.6, |
| surf3 | standard | -711.62 | 0.12 | ||
| surf4 | standard | 59.85 | 3.75 | 1.65, | 58.4, |
| surf5 | standard | 241.97 | d5 is movable | ||
| surf6 | standard | 354.47 | 1.15 | 1.85, | 23.8, |
| surf7 | standard | 7.12 | 2.97 | ||
| surf8 | evenasphere | 12.48 | 1.74 | 1.53, | 56, |
| surf9 | evenasphere | 13.67 | 1.75 | ||
| surf10 | standard | -15.82 | 1.06 | 1.77, | 49.6, |
| surf11 | standard | 17.61 | 2.16 | 1.92, | 20.9, |
| surf12 | standard | -45.58 | D12 is movable | ||
| Stop | standard | Infinity | 2.58 | ||
| surf14 | standard | 33.18 | 4.22 | 1.46, | 90.2, |
| surf15 | standard | -16.85 | 0.32 | ||
| surf16 | evenasphere | -16.80 | 1.50 | 1.54, | 55.7, |
| surf17 | evenasphere | -25.41 | 0.44 | ||
| surf18 | standard | -115.16 | 1.00 | 1.9, | 31.3, |
| surf19 | standard | 27.15 | D19 is movable | ||
| surf20 | standard | 26.43 | 3.04 | 1.62, | 60.4, |
| surf21 | standard | -36.43 | 1.50 | ||
| surf22 | standard | 34.09 | 2.64 | 1.62, | 60.4, |
| surf23 | standard | -45.53 | 1.50 | 1.92, | 24, |
| surf24 | standard | 45.53 | D24 is movable | ||
| surf25 | evenasphere | -26.02 | 1.12 | 1.54, | 56, |
| surf26 | evenasphere | -22.99 | 7.54 |
TABLE 5
The parameters of the aspherical lens in the zoom lens according to the present embodiment are shown in table 6 below:
| conic | 4th | 6th | 8th | 10th | 12th | |
| surf8 | 0.00 | -5.67E-04 | 7.90E-07 | -2.81E-07 | 1.57E-08 | -2.36E-10 |
| surf9 | 0.00 | -8.61E-04 | 2.46E-07 | -2.72E-07 | 1.35E-08 | -8.14E-11 |
| surf16 | 0.00 | -1.19E-05 | 1.25E-06 | 4.67E-08 | -5.15E-10 | |
| surf17 | 0.00 | 1.17E-04 | 2.25E-06 | 5.34E-08 | -4.46E-10 | |
| surf25 | 0.00 | 4.36E-04 | 8.72E-06 | -5.86E-07 | -4.12E-08 | 7.35E-10 |
| surf26 | 0.00 | 5.37E-04 | 8.39E-06 | -6.52E-07 | -5.09E-08 | 1.25E-09 |
TABLE 6
The zoom lens according to the present embodiment has the magnification-varying data shown in table 7 below:
| Thickness | wide angle end | Long coke end |
| D5 | 0.70 | 30.77 |
| D12 | 31.57 | 1.50 |
| D19 | 15.04 | 12.34 |
| D24 | 17.57 | 20.27 |
TABLE 7
As can be seen from fig. 7 and 8, the zoom lens of the present embodiment achieves synchronous correction of aberration and chromatic aberration at low cost by reasonable arrangement of structures between the groups and between the single lenses in the groups, thereby achieving high-quality imaging of the full focus. The zoom lens has the advantages of large zoom magnification, low distortion, wide range of focusable object distance, wide visual field range at the wide-angle end and the like.
Third embodiment
Referring to fig. 9 and 10, in the present embodiment, TTL is 101.63 mm; fno (wide) ═ 2.0; the focal length fw at the wide angle end is 4.51 mm; focal length at tele endft is 104.479 mm. The fourth lens L4 and the seventh lens L7 of the second lens group G2 are made of high refractive index glass, and the refractive indexes thereof are respectively as follows: nd (neodymium)L4＝1.85；NdL71.85. The ninth lens L9 of the third lens group G3 is made of low dispersion glass, and has a refractive index and an abbe number: nd (neodymium)L9＝1.44；VdL9＝95.10。
The parameters of each lens of the zoom lens according to the present embodiment include a surface Type (Type), a Radius of curvature (Radius), a Thickness (Thickness), a refractive index (Nd) of a material, an abbe number (Vd), and a Semi-Diameter (Semi-Diameter), as shown in table 8 below:
| Surface | Type | Radius | Thickness | Nd | Vd |
| surf1 | standard | 85.94 | 1.00 | 1.85 | 23.80 |
| surf2 | standard | 46.15 | 4.78 | 1.50 | 81.60 |
| surf3 | standard | -711.62 | 0.12 | ||
| surf4 | standard | 59.85 | 3.75 | 1.64 | 60.20 |
| surf5 | standard | -341.97 | d5 is movable | ||
| surf6 | standard | 54.47 | 1.15 | 1.85 | 23.80 |
| surf7 | standard | 8.12 | 2.47 | ||
| surf8 | evenasphere | 12.48 | 1.74 | 1.53 | 56.00 |
| surf9 | evenasphere | 13.67 | 2.25 | ||
| surf10 | standard | -15.82 | 1.06 | 1.62 | 60.40 |
| surf11 | standard | 47.61 | 0.70 | ||
| surf12 | standard | 27.61 | 2.16 | 1.85 | 23.80 |
| surf13 | standard | -95.58 | D13 is movable | ||
| Stop | standard | infinity | 0.58 | ||
| surf15 | evenasphere | 25.41 | 1.50 | 1.54 | 55.70 |
| surf16 | evenasphere | 21.80 | 0.32 | ||
| surf17 | standard | 14.85 | 4.22 | 1.44 | 95.10 |
| surf18 | standard | -23.18 | 0.44 | ||
| surf19 | standard | 65.16 | 1.00 | 1.91 | 35.30 |
| surf20 | standard | 27.15 | D20 is movable | ||
| surf21 | standard | 26.43 | 3.04 | 1.49 | 70.40 |
| surf22 | standard | -36.43 | 0.30 | ||
| surf23 | standard | 34.09 | 4.14 | 1.49 | 70.40 |
| surf24 | standard | -45.53 | 1.50 | 2.00 | 19.30 |
| surf25 | standard | 45.53 | D25 is movable | ||
| surf26 | evenasphere | -260.23 | 1.62 | 1.53 | 56.00 |
| surf27 | evenasphere | -22.99 | 7.80 |
TABLE 8
The parameters of the aspherical lens in the zoom lens according to the present embodiment are shown in table 9 below:
TABLE 9
The zoom lens according to the present embodiment has the magnification-varying data shown in table 10 below:
| Thickness | wide angle end | Long coke end |
| D5 | 1.00 | 45.2 |
| D13 | 46.75 | 2.55 |
| D20 | 3.57 | 2.78 |
| D25 | 2.67 | 3.46 |
As can be seen from fig. 11 and 12, the zoom lens of the present embodiment achieves synchronous correction of aberration and chromatic aberration at low cost by reasonable arrangement of structures between the groups and between the single lenses in the groups, thereby achieving high-quality imaging of the full focus. The zoom lens has the advantages of large zoom magnification, low distortion, wide range of focusable object distance, wide visual field range at the wide-angle end and the like.
Fourth embodiment
Referring to fig. 13 and 14, in the present embodiment, TTL is 85.32 mm; fno (wide) 1.20; wide-angle end focal length fw is 6.132 mm; the tele end focal length ft is 100.479 mm. The fourth lens L4 and the seventh lens L7 of the second lens group G2 are made of high refractive index glass, and the refractive indexes thereof are respectively as follows: nd (neodymium)L4＝1.90；NdL71.81. The ninth lens L9 of the third lens group G3 is made of low dispersion glass, and has a refractive index and an abbe number: nd (neodymium)L9＝1.50；VdL9＝81.60。
The parameters of each lens of the zoom lens according to the present embodiment include surface Type (Type), Radius of curvature (Radius), Thickness (Thickness), refractive index (Nd) of material, abbe number (Vd), and Semi-Diameter (Semi-Diameter), as shown in table 11 below:
| Surface | Type | Radius | Thickness | Nd | Vd |
| surf1 | standard | 85.94 | 1.00 | 1.90 | 31.30 |
| surf2 | standard | 46.15 | 4.78 | 1.62 | 63.40 |
| surf3 | standard | -711.62 | 0.30 | ||
| surf4 | standard | 59.85 | 4.75 | 1.62 | 60.40 |
| surf5 | standard | -541.97 | d5 is movable | ||
| surf6 | standard | 39.47 | 1.15 | 1.90 | 31.30 |
| surf7 | standard | 8.12 | 1.47 | ||
| surf8 | evenasphere | 7.48 | 1.74 | 1.53 | 56.00 |
| surf9 | evenasphere | 7.67 | 2.25 | ||
| surf10 | standard | -25.82 | 1.06 | 1.62 | 63.40 |
| surf11 | standard | 27.61 | 2.16 | 1.81 | 25.50 |
| surf12 | standard | -65.58 | D12 is movable | ||
| surf13 | standard | Infinity | 0.58 | ||
| surf14 | evenasphere | 15.41 | 1.50 | 1.54 | 55.70 |
| surf15 | evenasphere | 21.80 | 0.32 | ||
| surf16 | standard | 11.85 | 4.22 | 1.50 | 81.60 |
| surf17 | standard | -28.18 | 0.20 | ||
| surf18 | standard | 45.16 | 1.00 | 1.95 | 32.30 |
| surf19 | standard | 17.15 | D19 is movable | ||
| surf20 | standard | 26.43 | 3.04 | 1.52 | 59.00 |
| surf21 | standard | -86.43 | 0.30 | ||
| surf22 | standard | 34.09 | 2.64 | 1.62 | 63.40 |
| surf23 | standard | -45.53 | 0.30 | ||
| surf24 | standard | 95.53 | 1.50 | 1.95 | 17.90 |
| surf25 | standard | 45.53 | D25 is movable | ||
| surf26 | evenasphere | 260.23 | 2.00 | 1.53 | 56.00 |
| surf27 | evenasphere | -22.99 | 4.98 |
TABLE 11
The parameters of the aspherical lens in the zoom lens according to the present embodiment are shown in table 12 below:
TABLE 12
The zoom lens according to the present embodiment has the magnification-varying data shown in table 13 below:
| Thickness | wide angle end | Long coke end |
| D5 | 0.90 | 28.91 |
| D12 | 30.56 | 2.55 |
| D19 | 2.35 | 7.58 |
| D25 | 8.27 | 3.04 |
Watch 13
As can be seen from fig. 15 and 16, the zoom lens of the present embodiment achieves synchronous correction of aberration and chromatic aberration at low cost by reasonable arrangement of structures between the groups and between the single lenses in the groups, thereby achieving high-quality imaging of the full focus. The zoom lens has the advantages of large zoom magnification, low distortion, wide range of focusable object distance, wide visual field range at the wide-angle end and the like.
Fifth embodiment
Referring to fig. 17 and 18, in the present embodiment, TTL is 91.71 mm; fno (wide) 1.40; the focal length fw at the wide angle end is 4.01 mm; the tele end focal length ft is 91.91 mm. The fourth lens L4 and the seventh lens L7 of the second lens group G2 are made of high refractive index glass, and the refractive indexes thereof are respectively as follows: nd (neodymium)L4＝1.91；NdL72.00. The eighth lens L8 of the third lens group G3 is made of low dispersion glass, and has a refractive index and an abbe number: nd (neodymium)L8＝1.59；VdL8＝68.60。
The parameters of each lens of the zoom lens according to the present embodiment include a surface Type (Type), a Radius of curvature (Radius), a Thickness (Thickness), a refractive index (Nd) of a material, an abbe number (Vd), and a Semi-Diameter (Semi-Diameter), as shown in table 14 below:
| Surface | Type | Radius | Thickness | Nd | Vd |
| surf1 | standard | 55.94 | 1.00 | 1.95 | 21.00 |
| surf2 | standard | 36.15 | 6.28 | 1.45 | 94.50 |
| surf3 | standard | -400.00 | 0.50 | ||
| surf4 | standard | 48.85 | 4.75 | 1.62 | 63.40 |
| surf5 | standard | -841.97 | d5 is movable | ||
| surf6 | standard | 25.91 | 1.15 | 1.91 | 35.30 |
| surf7 | standard | 8.12 | 2.67 | ||
| surf8 | evenasphere | 16.32 | 1.74 | 1.53 | 56.00 |
| surf9 | evenasphere | 17.11 | 1.75 | ||
| surf10 | standard | -15.82 | 1.26 | 1.73 | 54.70 |
| surf11 | standard | 17.61 | 2.66 | 2.00 | 19.30 |
| surf12 | standard | -45.58 | D12 is movable | ||
| surf13 | standard | Infinity | 0.58 | ||
| surf14 | standard | 13.18 | 4.22 | 1.59 | 68.60 |
| surf15 | standard | -36.85 | 0.32 | ||
| surf16 | evenasphere | -51.80 | 1.50 | 1.54 | 55.70 |
| surf17 | evenasphere | -25.41 | 0.14 | ||
| surf18 | standard | 66.16 | 1.00 | 1.90 | 31.30 |
| surf19 | standard | 27.15 | D19 is movable | ||
| surf20 | standard | 26.43 | 3.04 | 1.52 | 64.20 |
| surf21 | standard | -36.43 | 0.50 | ||
| surf22 | standard | 34.09 | 2.64 | 1.52 | 64.20 |
| surf23 | standard | -45.53 | 1.50 | 1.92 | 20.90 |
| surf24 | standard | 45.53 | D24 is movable | ||
| surf25 | evenasphere | -12.99 | 1.12 | 1.53 | 56.00 |
| surf26 | evenasphere | -11.02 | 4.98 |
TABLE 14
The parameters of the aspherical lens in the zoom lens according to the present embodiment are shown in table 15 below:
| conic | 4th | 6th | 8th | 10th | 12th | |
| surf8 | 7.00 | -3.78E-04 | 1.05E-06 | -3.75E-07 | 8.74E-09 | -7.86E-11 |
| surf9 | 8.00 | -5.74E-04 | 1.64E-07 | -1.81E-07 | 2.25E-09 | -1.36E-12 |
| surf16 | 15.00 | -1.19E-05 | 1.25E-06 | 4.67E-08 | -5.15E-10 | |
| surf17 | 16.00 | 1.17E-04 | 2.25E-06 | 5.34E-08 | -4.46E-10 | |
| surf25 | 24.00 | 1.09E-05 | 1.74E-05 | 2.08E-06 | 6.86E-09 | 7.35E-10 |
| surf26 | 25.00 | 5.37E-04 | 4.19E-05 | -7.25E-08 | -1.99E-08 | 1.25E-09 |
watch 15
The zoom lens according to the present embodiment has the magnification-varying data shown in table 16 below:
| Thickness | wide angle end | Long coke end |
| D5 | 1.00 | 29.00 |
| D12 | 33.66 | 5.66 |
| D19 | 8.91 | 5.47 |
| D24 | 2.84 | 6.28 |
TABLE 16
As can be seen from fig. 19 and 20, the zoom lens of the present embodiment achieves synchronous correction of aberration and chromatic aberration at low cost by reasonable arrangement of structures between the groups and between the single lenses in the groups, thereby achieving high-quality imaging of the full focus. The zoom lens has the advantages of large zoom magnification, low distortion, wide range of focusable object distance, wide visual field range at the wide-angle end and the like.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A zoom lens including a first lens group (G1) having positive power, a second lens group (G2) having negative power, a STOP (STOP), a third lens group (G3) having positive power, a fourth lens group (G4) having positive power, and a fifth lens group (G5) having positive power, the second lens group (G2) being movable from the object side to the image side along the optical axis to perform magnification change from the wide-angle end to the telephoto end, the fourth lens group (G4) being movable along the optical axis to correct a change in the image plane position during magnification change, the zoom lens being characterized in that the second lens group (G2) is composed of four lenses, and the fifth lens group (G5) is composed of one lens.
2. The zoom lens according to claim 1, wherein the first lens group (G1) has at least two positive lenses and one negative lens;
the lens of the first lens group (G1) closest to the object side is a convex-concave lens, and the optical power is negative.
3. The zoom lens as claimed in claim 1, wherein the second lens group (G2) has at least one positive lens, two negative lenses, and a plastic lens;
the lens of the second lens group (G2) closest to the object side is a convex-concave lens, and the focal power is negative.
4. The zoom lens as claimed in claim 1, wherein the third lens group (G3) comprises three lenses, at least one of which comprises a positive lens, a negative lens, and a plastic lens;
the power of the lens closest to the image side of the third lens group (G3) is negative, and the image side surface is concave.
5. The zoom lens according to claim 1, wherein the fourth lens group (G4) has at least two positive lenses and one negative lens;
in the fourth lens group (G4), the power of the lens closest to the object side is positive; the power of the lens closest to the image side is negative, and the image side surface is concave.
6. The zoom lens according to claim 1, wherein the lens power in the fifth lens group (G5) is positive, and the image side paraxial region is convex.
7. A zoom lens according to any one of claims 1 to 6, wherein the following relation is satisfied:
4.5≤(d12t-d12w)/fw≤10；
wherein d is12tWhen the zoom lens is at the telephoto endA distance d from the last surface of the first lens group (G1) to the first surface of the second lens group (G2)12wAnd fw is a focal length of the zoom lens at a wide-angle end, wherein the distance from the last surface of the first lens group (G1) to the first surface of the second lens group (G2) is from the zoom lens at the wide-angle end.
8. A zoom lens according to any one of claims 1 to 6, wherein the following relation is satisfied:
2≤TTL/(d12t-d12w)≤4；
wherein d is12tA distance from a last face of the first lens group (G1) to a first face of the second lens group (G2) at a telephoto end of the zoom lens, d12wWhen the zoom lens is at a wide angle end, the distance from the last surface of the first lens group (G1) to the first surface of the second lens group (G2) is TTL (total track time), and the distance from the first surface of the first lens group (G1) to an imaging surface is TTL.
9. A zoom lens according to any one of claims 1-6, wherein the focal length f2 of the second lens group (G2) and the focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: the | f2| fw is more than or equal to 1 and less than or equal to 4.
10. A zoom lens according to any one of claims 1-6, wherein the focal length f3 of the third lens group (G3) and the focal length fw at the wide-angle end of the zoom lens satisfy the following relationship: f3/fw is more than or equal to 4 and less than or equal to 8.
11. A zoom lens according to claim 1 or 2, wherein the following relation is satisfied:
30≤|V1is just-V1Negative pole|≤75；
Wherein, V1Is justV1 is the Abbe number of a positive lens close to the object side in the first lens group (G1)Negative poleIs the Abbe number of the negative lens in the first lens group (G1).
12. The zoom lens according to any one of claims 1 to 6, wherein at least two lenses of the second lens group (G2) are made of high-refractivity glass and have a refractive index NDiThe following conditions are satisfied: NDi≥1.75。
13. The zoom lens according to any one of claims 1 to 6, wherein at least one lens of the third lens group (G3) is made of low dispersion glass and has an Abbe number VDjAnd refractive index NDjThe following conditions are respectively satisfied: VD is not less than 65j≤100；1.4≤NDj≤1.60。
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| CN114815196A (en) * | 2022-06-06 | 2022-07-29 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN114815196B (en) * | 2022-06-06 | 2024-02-23 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN114839752A (en) * | 2022-06-10 | 2022-08-02 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN114839752B (en) * | 2022-06-10 | 2024-03-19 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN116027530A (en) * | 2023-03-29 | 2023-04-28 | 深圳市东正光学技术股份有限公司 | Optical imaging system and optical lens |
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