CN115079389B - Zoom lens - Google Patents
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- CN115079389B CN115079389B CN202210745180.0A CN202210745180A CN115079389B CN 115079389 B CN115079389 B CN 115079389B CN 202210745180 A CN202210745180 A CN 202210745180A CN 115079389 B CN115079389 B CN 115079389B
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- 239000011521 glass Substances 0.000 description 9
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Classifications
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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
- G02B15/142—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 two groups only
- G02B15/1425—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 two groups only the first group being negative
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
Abstract
The present invention relates to a zoom lens, including, in order from an object side to an image side along an optical axis: the lens system comprises a compensation lens group with negative focal power, a diaphragm and a zoom lens group with positive focal power, wherein the compensation lens group sequentially comprises a first lens (L1), a second lens (L2) and a third lens (L3), the zoom lens group sequentially comprises a fourth lens (L4), a fifth lens (L5), a sixth lens (L6), a seventh lens (L7), an eighth lens (L8) and a ninth lens (L9), the seventh lens (L7) and the ninth lens (L9) are plastic aspheric lenses, and the focal length Fb of the zoom lens group and the focal length ft of the telescopic end of the zoom lens satisfy the following formula: fb/ft is less than or equal to 1.17 and is 1.12. The zoom lens realizes 3 times of zooming under the condition of a certain total length, has high resolution imaging and infrared confocal, has the wide-angle end view angle exceeding 120 degrees, has no dark angle in the zooming process, high-efficiency zooming, small volume and low cost, and can be compatible with various windows.
Description
Technical Field
The invention relates to the technical field of optical system and device design, in particular to a zoom lens.
Background
The zoom lens is an optical lens with continuously variable focal length, unchanged image plane position and excellent image quality. Because of the characteristic of variable focal length, the optical fiber lens is widely applied to the fields of security protection, monitoring, traffic and the like, and can realize the search of a large visual field and the detailed investigation of a small visual field. With the recent technological development, the zoom lens gradually breaks through towards high pixel, large aperture and low cost. In recent years, manufacturers have also continuously introduced high-performance zoom lenses with high resolution, large aperture, day-night confocal and high-low temperature confocal, which place higher demands on the development and manufacture of zoom lenses.
However, the high resolution, large aperture, day and night confocal and high and low temperature confocal zoom lens on the market has large head volume and poor compatibility due to the large aperture of the front group lens, and cannot be matched with the camera component of the old product. Products with high compatibility and high performance are often high in cost and price, and are difficult to popularize in a large scale. Therefore, it is difficult for the existing zoom lens to realize the characteristics of high compatibility, high performance and low cost at the same time.
Disclosure of Invention
In order to solve the problems of the prior art, the invention aims to provide a high-definition zoom lens with low cost, small volume, infrared confocal and wide-angle end view angle exceeding 120 degrees.
In order to achieve the above object, the present invention provides a zoom lens, comprising, in order from an object side to an image side along an optical axis: the lens system comprises a compensation lens group with negative focal power, a diaphragm and a zoom lens group with positive focal power, wherein the compensation lens group sequentially comprises a first lens, a second lens and a third lens, the zoom lens group sequentially comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens, the seventh lens and the ninth lens are plastic aspheric lenses, and a focal length Fb of the zoom lens group and a focal length ft of a telescopic end of the zoom lens satisfy the following conditional expression: fb/ft is less than or equal to 1.17 and is 1.12.
According to one aspect of the invention, the optical power of the first and second lenses are both negative and the optical power of the third lens is positive.
According to one aspect of the invention, the fourth lens and the eighth lens are each positive in optical power, and the fifth lens, the sixth lens, the seventh lens and the ninth lens are each negative in optical power.
According to one aspect of the present invention, the fourth lens and the fifth lens are cemented to form a cemented lens group.
According to one aspect of the present invention, a condition is satisfied between a focal length Fb1 of the cemented lens group and a focal length Fb of the variable magnification lens group: fb1/Fb is more than or equal to 0.93 and less than or equal to 1.16.
According to one aspect of the present invention, the focal length Fa of the compensation lens group and the focal length Fb of the variable magnification lens group satisfy the conditional expression: the absolute Fa/Fb is more than or equal to 0.81 and less than or equal to 0.84.
According to one aspect of the present invention, a condition is satisfied between a focal length Fb of the variable magnification lens group and a focal length fw of a wide-angle end of the zoom lens: fb/fw is more than or equal to 2.85 and less than or equal to 3.02.
According to an aspect of the present invention, a distance Δd that the variable magnification lens group moves from the wide angle end of the zoom lens to the telephoto end of the zoom lens and an optical total length TTL of the wide angle end of the zoom lens satisfy the conditional expression: the delta D/TTL is less than or equal to 0.15.
According to one aspect of the present invention, a condition is satisfied between a focal length f7 of the seventh lens and a focal length f8 of the eighth lens: -2.02.ltoreq.f7/f8.ltoreq.1.53.
According to one aspect of the present invention, the refractive index nd4 and the abbe number vd4 of the fourth lens respectively satisfy the following conditional expressions: nd4 is more than or equal to 1.54 and less than or equal to 1.58; 71.18.ltoreq.vd4.ltoreq.71.88.
According to one aspect of the invention, the optical axis is oriented in a direction from the object side to the image side,
the first lens is a convex-concave lens, a plano-concave lens or a biconcave lens;
the second lens and the ninth lens are paraxial region biconcave lenses;
the third lens and the eighth lens are paraxial region biconvex lenses;
the fourth lens is a biconvex lens;
the fifth lens is a concave-convex lens;
the sixth lens is a paraxial region convex-concave lens or a paraxial region biconcave lens;
the seventh lens is a paraxial region convex-concave lens.
According to one aspect of the present invention, the second lens, the third lens, the sixth lens and the eighth lens are all plastic aspherical lenses.
According to one aspect of the present invention, the optical effective diameter d1 of the first lens and the total optical length TTL at the wide-angle end of the zoom lens satisfy the conditional expression: d1/TTL is less than or equal to 0.30.
According to the scheme of the invention, through reasonably configuring the focal power among the lens groups, accurately calculating and optimizing the focal power of each lens, the focal length relation among the lens groups and each lens, the variation range of the focal length relation among the lenses and the like, the caliber of the first lens is not more than phi 14mm, so that the zoom lens can realize 3 times zooming under the condition of a certain total length, has high-resolution imaging and infrared confocal, simultaneously compresses the volume of the lens, realizes small volume, can be compatible with various windows, has the view field angle of the wide-angle end of the lens exceeding 120 degrees, and has no dark angle and high-efficiency zooming in the zooming process.
According to one scheme of the invention, through the selection and reasonable collocation of specific materials of the lens, the zoom optical system can still keep good resolution at the high temperature of 80 ℃ and the low temperature of-40 ℃ and does not have virtual focus at the high temperature and the low temperature. And by using the glass lens and the plastic lens in a mixed way, under the condition of using few glass lenses, various performances of the optical system are still ensured, and meanwhile, the production cost is greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1-1 schematically illustrates a configuration diagram of a wide-angle end of a zoom lens according to a first embodiment of the present invention;
fig. 1-2 schematically show a structure of a zoom lens according to a first embodiment of the present invention;
fig. 1 to 3 schematically show a visible Ray Fan diagram at the wide-angle end of a zoom lens according to a first embodiment of the present invention;
fig. 1 to 4 schematically show a visible Ray Fan diagram of a telephoto end of a zoom lens according to a first embodiment of the present invention;
fig. 2-1 schematically illustrates a structure of a zoom lens at a wide-angle end according to a second embodiment of the present invention;
fig. 2-2 schematically illustrates a structure of a zoom lens according to a second embodiment of the present invention;
fig. 2 to 3 schematically show a visible Ray Fan diagram at the wide-angle end of a zoom lens according to a second embodiment of the present invention;
fig. 2 to 4 schematically show a visible Ray Fan diagram of a telephoto end of a zoom lens according to a second embodiment of the present invention;
fig. 3-1 schematically shows a configuration diagram of a wide-angle end of a zoom lens according to a third embodiment of the present invention;
fig. 3-2 schematically illustrates a structure of a telephoto end of a zoom lens according to a third embodiment of the present invention;
fig. 3 to 3 schematically show a visible Ray Fan diagram at the wide-angle end of a zoom lens according to a third embodiment of the present invention;
fig. 3 to 4 schematically show a visible Ray Fan diagram of a telephoto end of a zoom lens according to a third embodiment of the present invention;
fig. 4-1 schematically shows a configuration diagram of a wide-angle end of a zoom lens according to a fourth embodiment of the present invention;
fig. 4-2 schematically illustrates a structure of a zoom lens according to a fourth embodiment of the present invention;
fig. 4-3 schematically show a visible Ray Fan diagram at the wide-angle end of a zoom lens according to a fourth embodiment of the present invention;
fig. 4 to 4 schematically show a visible Ray Fan diagram of a telephoto end of a zoom lens according to a fourth embodiment of the present invention.
Detailed Description
The description of the embodiments of this specification should be taken in conjunction with the accompanying drawings, which are a complete description of the embodiments. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated simply or conveniently. Furthermore, portions of the structures in the drawings will be described in terms of separate descriptions, and it should be noted that elements not shown or described in the drawings are in a form known to those of ordinary skill in the art.
Any references to directions and orientations in the description of the embodiments herein are for convenience only and should not be construed as limiting the scope of the invention in any way. The following description of the preferred embodiments will refer to combinations of features which may be present alone or in combination, and the invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.
As shown in fig. 1-1 and fig. 1-2, a zoom lens according to an embodiment of the present invention sequentially includes, along an optical axis from an object side to an image side: a compensating lens group with negative focal power, a diaphragm and a variable power lens group with positive focal power. The compensating lens group sequentially comprises a first lens L1, a second lens L2 and a third lens L3, and the variable magnification lens group sequentially comprises a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9.
In the embodiment of the invention, the optical powers of the first lens L1, the second lens L2, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the ninth lens L9 are all negative, and the optical powers of the third lens L3, the fourth lens L4 and the eighth lens L8 are all positive.
In the embodiment of the present invention, the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens group (or referred to as a cemented doublet lens group).
In the embodiment of the invention, the focal length Fa of the compensation lens group and the focal length Fb of the zoom lens group satisfy the following conditional expression: the absolute Fa/Fb is more than or equal to 0.81 and less than or equal to 0.84. The focal power among the groups is reasonably distributed, so that the transmissibility of light rays is improved, and focusing and zooming are better realized.
In the embodiment of the present invention, the focal length Fb of the zoom lens group and the focal length fw of the wide-angle end of the zoom lens satisfy the following conditional expression: fb/fw is more than or equal to 2.85 and less than or equal to 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 following conditions: fb/ft is less than or equal to 1.17 and is 1.12. Through reasonably setting the relation between the focal length of the zoom lens group and the focal length of the wide-angle end and the focal length of the telescopic end of the lens respectively, the zoom lens can realize large zoom ratio as much as possible under the condition of a certain total length of the lens, and can specifically realize 3 times zooming, and the total length of the lens is better limited, so that the volume of the lens is reduced.
In the embodiment of the present invention, the distance Δd from the wide-angle end of the zoom lens to the telephoto end of the zoom lens and the total optical length TTL of the wide-angle end of the zoom lens satisfy the following conditional expression: the delta D/TTL is less than or equal to 0.15. The arrangement can realize large zoom ratio with smaller group interval variation, improve zoom efficiency, compress total length of the lens and realize miniaturization of the lens.
In the embodiment of the present invention, the focal length Fb1 of the cemented lens group composed of the fourth lens L4 and the fifth lens L5 and the focal length Fb of the variable magnification lens group satisfy the following conditional expression: fb1/Fb is more than or equal to 0.93 and less than or equal to 1.16. The optical power of the cemented lens group is reasonably distributed, so that the transmissibility of light rays from the compensation lens group to the zoom lens group can be further improved, the volume of the lens zoom lens group is reduced, high-efficiency zooming can be realized, and the light weight and the production cost can be reduced.
In the embodiment of the present invention, the focal length f7 of the seventh lens L7 and the focal length f8 of the eighth lens L8 satisfy the following conditional expression: -2.02.ltoreq.f7/f8.ltoreq.1.53. The collocation relation of positive and negative focal power of the seventh lens L7 and the eighth lens L8 is favorable for aberration correction, and the compensation of the zoom lens in a high-low temperature state is effectively ensured.
In the embodiment of the present invention, the refractive index nd4 and the abbe number vd4 of the fourth lens L4 respectively satisfy the following conditional expressions: nd4 is more than or equal to 1.54 and less than or equal to 1.58; 71.18.ltoreq.vd4.ltoreq.71.88. The arrangement of the fourth lens L4 of the material can further correct chromatic aberration of the lens, so that the ultraviolet edge of the lens is well balanced, and meanwhile, complete confocal of visible light and infrared light is realized.
In the embodiment of the invention, along the direction from the object side to the image side of the optical axis, the first lens L1 is a convex-concave lens, a plano-concave lens or a biconcave lens; the second lens L2 and the ninth lens L9 are paraxial region biconcave lenses; the third lens L3 and the eighth lens L8 are paraxial region biconvex lenses; the fourth lens L4 is a biconvex lens; the fifth lens L5 is a concave-convex lens; the sixth lens L6 is a paraxial convex-concave lens or a paraxial biconcave lens; the seventh lens L7 is a paraxial region convex-concave lens.
In the embodiment of the invention, 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 plastic aspheric lenses. By reasonably configuring the aspheric lens and the spherical lens, various aberrations of the system can be well corrected, so that the resolution of the lens is improved, and 4K high-definition resolving power is realized. Meanwhile, by skillfully matching the glass lens and the plastic lens, the back Jiao Piaoyi of the lens at high and low temperatures is perfectly compensated, clear imaging of the lens at the limiting temperature is ensured, and no virtual focus exists at the high and low temperatures, so that the optical system can still maintain good resolution at the high temperature of 80 ℃ and the low temperature of-40 ℃. Under the condition of using fewer glass lenses, various performances of the lens optical system are still ensured, and the production cost is greatly reduced.
In the embodiment of the present invention, the optical effective diameter d1 of the first lens L1 and the total optical length TTL at the wide-angle end of the zoom lens satisfy the following conditional expression: d1/TTL is less than or equal to 0.30. The head size of the lens is greatly reduced by selecting the refractive index of the lens and reasonably configuring the focal power, so that the lens has the characteristic of small volume.
In summary, the aperture of the first lens L1 in the zoom lens provided by the embodiment of the invention is not more than phi 14mm, the zoom lens realizes 3 times of zooming under the condition of a certain total length, has high-resolution imaging and infrared confocal, simultaneously compresses the volume of the lens, realizes small volume, can be compatible with various windows, has the angle of view at the wide-angle end of the lens exceeding 120 degrees, and has no dark angle and high-efficiency zooming in the zooming process. The zoom optical system can still keep good resolution at the high temperature of 80 ℃ and the low temperature of-40 ℃ and has no virtual focus at the high temperature and the low temperature. And under the condition of using few glass lenses, various performances of the zooming optical system are still ensured, and meanwhile, the production cost is greatly reduced.
The zoom lens of the present invention will be specifically described below with reference to the accompanying drawings and tables in four embodiments. In the following embodiments, the present invention refers to diaphragms as one side, image planes as one side, and doublet lens groups as three sides.
The parameters of the respective examples specifically satisfying the above conditional expression are shown in the following table 1:
| conditional expression | Example 1 | Example two | Example III | Example IV |
| 0.81≤|Fa/Fb|≤0.84 | 0.83 | 0.83 | 0.83 | 0.82 |
| 2.85≤Fb/fw≤3.02 | 2.88 | 2.94 | 2.94 | 2.99 |
| 1.12＜Fb/ft≤1.17 | 1.14 | 1.13 | 1.15 | 1.16 |
| ΔD/TTL≤0.15 | 0.141 | 0.142 | 0.142 | 0.145 |
| 0.93≤fb1/Fb≤1.16 | 1.03 | 1.12 | 1.02 | 0.97 |
| -2.02≤f7/f8≤-1.53 | -1.70 | -1.84 | -1.61 | -1.93 |
| 1.54≤nd4≤1.58 | 1.57 | 1.55 | 1.57 | 1.57 |
| 71.18≤vd4≤71.88 | 71.30 | 71.76 | 71.31 | 71.30 |
| d1/TTL≤0.30 | 0.26 | 0.28 | 0.29 | 0.29 |
Table 1 in an embodiment of the present invention, the plastic aspherical 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 with the height y perpendicular to the optical axis along the optical axis direction; c represents an aspherical surface topCurvature at the point; k is a conic coefficient; a is that 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 The fourth order, sixth order, eighth order, tenth order, fourteenth order, sixteen order, respectively, are aspherical coefficients.
Example 1
Referring to fig. 1-1 and 1-2, the parameters of the zoom lens in the present embodiment are as follows:
focal length: 3.56-9.03mm; f number:1.77-3.17; wide-angle end TTL:46.74mm; wide-angle end field angle: 125.29 deg..
Table 2 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
| Surface serial number | Surface type | Radius of curvature | Thickness of (L) | Refractive index | Abbe number |
| 1 | Spherical surface | Infinity | 0.52 | 2.00 | 29.13 |
| 2 | Spherical surface | 7.03 | 3.04 | ||
| 3 | Aspherical surface | -21.96 | 1.57 | 1.54 | 55.71 |
| 4 | Aspherical surface | 14.44 | 0.13 | ||
| 5 | Aspherical surface | 18.08 | 2.55 | 1.66 | 20.37 |
| 6 | Aspherical surface | -21.01 | D1 | ||
| 7 (diaphragm) | Spherical surface | Infinity | D2 | ||
| 8 | Spherical surface | 7.97 | 5.83 | 1.57 | 71.30 |
| 9 | Spherical surface | -5.22 | 0.52 | 1.79 | 47.49 |
| 10 | Spherical surface | -10.61 | 0.06 | ||
| 11 | Aspherical surface | 39.81 | 1.04 | 1.54 | 55.98 |
| 12 | Aspherical surface | 20.80 | 0.11 | ||
| 13 | Aspherical surface | 60.06 | 2.50 | 1.64 | 23.50 |
| 14 | Aspherical surface | 9.56 | 0.06 | ||
| 15 | Aspherical surface | 8.32 | 3.26 | 1.54 | 55.98 |
| 16 | Aspherical surface | -15.52 | 0.88 | ||
| 17 | Aspherical surface | -48.24 | 1.45 | 1.64 | 23.50 |
| 18 | Aspherical surface | 27.83 | D3 | ||
| Image plane | Spherical surface | Infinity | - | - | - |
TABLE 2
Table 3 lists the aspherical coefficients of the respective aspherical lenses of the zoom lens of the present embodiment, including: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 Fourteen-order aspheric coefficient A 14 And sixteen order aspheric coefficient A 16 。
TABLE 3 Table 3
Table 4 lists variable interval values when the zoom lens of the present embodiment is changed from the wide-angle end to the telephoto end. Wherein D1 represents the center distance from the image side surface of the third lens element L3 to the stop in the compensation lens group, D2 represents the center distance from the stop to the object side surface of the fourth lens element L4 in the variable magnification lens group, and D3 represents the center distance from the image side surface of the ninth lens element L9 to the image plane in the variable magnification lens group.
| Surface serial number | Thickness of (L) | Wide angle end | Telescope end |
| 6 | D1 | 10.97 | 2.64 |
| 7 | D2 | 6.78 | 0.2 |
| 18 | D3 | 5.47 | 12.05 |
TABLE 4 Table 4
1-1 to 1-4 and the foregoing tables 1 to 4, the aperture of the first lens L1 in the zoom lens of this embodiment is not more than Φ14mm, and the zoom lens achieves 3 times zooming under a certain total length condition, has high resolution imaging and infrared confocal, simultaneously compresses the volume of the lens, achieves small volume, can be compatible with various windows, has a view field angle at the wide-angle end of the lens of 125.29 degrees, and has no dark angle and high-efficiency zooming in the zooming process. The zoom optical system can still keep good resolution at the high temperature of 80 ℃ and the low temperature of-40 ℃ and has no virtual focus at the high temperature and the low temperature. And under the condition of using few glass lenses, various performances of the zooming optical system are still ensured, and meanwhile, the production cost is greatly reduced.
Example two
Referring to fig. 2-1 and 2-2, the parameters of the zoom lens of the present embodiment are as follows:
focal length: 3.48-9.02mm; f number:1.76-3.18; wide-angle end TTL:46.72mm; wide-angle end field angle: 122.28 deg..
Table 5 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
TABLE 5
Table 6 lists the aspherical coefficients of the respective aspherical lenses of the zoom lens of the present embodiment, including: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Aspheric system of ten stepsNumber A 10 Twelve-order aspheric coefficient A 12 Fourteen-order aspheric coefficient A 14 And sixteen order aspheric coefficient A 16 。
TABLE 6
Table 7 lists variable interval values when the zoom lens of the present embodiment is changed from the wide-angle end to the telephoto end. Wherein D1 represents the center distance from the image side surface of the third lens element L3 to the stop in the compensation lens group, D2 represents the center distance from the stop to the object side surface of the fourth lens element L4 in the variable magnification lens group, and D3 represents the center distance from the image side surface of the ninth lens element L9 to the image plane in the variable magnification lens group.
| Surface serial number | Thickness of (L) | Wide angle end | Telescope end |
| 6 | D1 | 11.28 | 2.64 |
| 7 | D2 | 6.82 | 0.20 |
| 18 | D3 | 5.43 | 12.05 |
TABLE 7
2-1 to 2-4 and the foregoing tables 1 and 5 to 7, the caliber of the first lens L1 in the zoom lens of the embodiment does not exceed Φ14mm, and the zoom lens achieves 3 times zooming under a certain total length condition, has high resolution imaging and infrared confocal, simultaneously compresses the volume of the lens, achieves small volume, can be compatible with various windows, has a view field angle of 122.28 DEG at the wide-angle end of the lens, and has no dark angle and high-efficiency zooming in the zooming process. The zoom optical system can still keep good resolution at the high temperature of 80 ℃ and the low temperature of-40 ℃ and has no virtual focus at the high temperature and the low temperature. And under the condition of using few glass lenses, various performances of the zooming optical system are still ensured, and meanwhile, the production cost is greatly reduced.
Example III
Referring to fig. 3-1 and 3-2, the parameters of the zoom lens of the present embodiment are as follows:
focal length: 3.52-9.02mm; f number:1.77-3.16; wide-angle end TTL:46.86mm; wide-angle end field angle: 124.61 deg..
Table 8 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
TABLE 8
Table 9 lists the aspherical coefficients of the respective aspherical lenses of the zoom lens of the present embodiment, including: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric system of six ordersNumber A 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 Fourteen-order aspheric coefficient A 14 And sixteen order aspheric coefficient A 16 。
TABLE 9
Table 10 lists variable interval values when the zoom lens of the present embodiment is changed from the wide-angle end to the telephoto end. Wherein D1 represents the center distance from the image side surface of the third lens element L3 to the stop in the compensation lens group, D2 represents the center distance from the stop to the object side surface of the fourth lens element L4 in the variable magnification lens group, and D3 represents the center distance from the image side surface of the ninth lens element L9 to the image plane in the variable magnification lens group.
| Surface serial number | Thickness of (L) | Wide angle end | Telescope end |
| 6 | D1 | 11.25 | 2.64 |
| 7 | D2 | 6.87 | 0.20 |
| 18 | D3 | 5.71 | 12.38 |
Table 10
With reference to fig. 3-1 to 3-4 and the foregoing tables 1 and 8 to 10, the aperture of the first lens L1 in the zoom lens of this embodiment does not exceed Φ14mm, and the zoom lens achieves 3 times zooming under a certain total length condition, has high resolution imaging and infrared confocal, simultaneously compresses the volume of the lens, achieves a small volume, can be compatible with various windows, has a view field angle at the wide-angle end of the lens of 124.61 ° and has no dark angle in the zooming process, and high-efficiency zooming. The zoom optical system can still keep good resolution at the high temperature of 80 ℃ and the low temperature of-40 ℃ and has no virtual focus at the high temperature and the low temperature. And under the condition of using few glass lenses, various performances of the zooming optical system are still ensured, and meanwhile, the production cost is greatly reduced.
Example IV
Referring to fig. 4-1 and 4-2, the parameters of the zoom lens of the present embodiment are as follows:
focal length: 3.50-9.02mm; f number:1.77-3.16; wide-angle end TTL:46.80mm; wide-angle end field angle: 124.29 deg..
Table 11 lists relevant parameters of each lens in the zoom lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
| Surface serial number | Surface type | Radius of curvature | Thickness of (L) | Refractive index | Abbe number |
| 1 | Spherical surface | -267.24 | 0.52 | 1.91 | 35.25 |
| 2 | Spherical surface | 6.25 | 3.48 | ||
| 3 | Aspherical surface | -39.21 | 1.18 | 1.54 | 55.71 |
| 4 | Aspherical surface | 20.73 | 0.07 | ||
| 5 | Aspherical surface | 35.61 | 2.14 | 1.66 | 20.37 |
| 6 | Aspherical surface | -19.30 | D1 | ||
| 7 (diaphragm) | Spherical surface | Infinity | D2 | ||
| 8 | Spherical surface | 7.84 | 5.62 | 1.57 | 71.30 |
| 9 | Spherical surface | -4.97 | 0.52 | 1.79 | 47.49 |
| 10 | Spherical surface | -9.90 | 0.06 | ||
| 11 | Aspherical surface | -300.00 | 1.04 | 1.54 | 55.98 |
| 12 | Aspherical surface | 21.02 | 0.11 | ||
| 13 | Aspherical surface | 46.20 | 2.44 | 1.64 | 23.50 |
| 14 | Aspherical surface | 9.82 | 0.06 | ||
| 15 | Aspherical surface | 7.59 | 3.10 | 1.54 | 55.98 |
| 16 | Aspherical surface | -17.41 | 0.91 | ||
| 17 | Aspherical surface | -51.96 | 1.00 | 1.64 | 23.50 |
| 18 | Aspherical surface | 37.23 | D3 | ||
| Image plane | Spherical surface | Infinity | - | - | - |
TABLE 11
Table 12 lists the aspherical coefficients of the respective aspherical lenses of the zoom lens of the present embodiment, including: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 Fourteen-order aspheric coefficient A 14 And sixteen order aspheric coefficient A 16 。
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Table 12
Table 13 lists variable interval values when the zoom lens of the present embodiment is changed from the wide-angle end to the telephoto end. Wherein D1 represents the center distance from the image side surface of the third lens element L3 to the stop in the compensation lens group, D2 represents the center distance from the stop to the object side surface of the fourth lens element L4 in the variable magnification lens group, and D3 represents the center distance from the image side surface of the ninth lens element L9 to the image plane in the variable magnification lens group.
| Surface of the bodySequence number | Thickness of (L) | Wide angle end | Telescope end |
| 6 | D1 | 11.44 | 2.64 |
| 7 | D2 | 6.97 | 0.20 |
| 18 | D3 | 6.14 | 12.91 |
TABLE 13
With reference to fig. 4-1 to 4 and tables 1 and 11 to 13, the aperture of the first lens L1 in the zoom lens of the present embodiment is not more than Φ14mm, and the zoom lens achieves 3 times zooming under a certain total length condition, has high resolution imaging and infrared confocal, simultaneously compresses the volume of the lens, achieves a small volume, can be compatible with various windows, has a view field angle of 124.29 ° at the wide-angle end of the lens, and has no dark angle and high-efficiency zooming in the zooming process. The zoom optical system can still keep good resolution at the high temperature of 80 ℃ and the low temperature of-40 ℃ and has no virtual focus at the high temperature and the low temperature. And under the condition of using few glass lenses, various performances of the zooming optical system are still ensured, and meanwhile, the production cost is greatly reduced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (11)
1. A zoom lens, comprising, in order along an optical axis in a direction from an object side to an image side: the lens system comprises a compensation lens group with negative focal power, a diaphragm and a zoom lens group with positive focal power, wherein the compensation lens group sequentially comprises a first lens (L1), a second lens (L2) and a third lens (L3), the zoom lens group sequentially comprises a fourth lens (L4), a fifth lens (L5), a sixth lens (L6), a seventh lens (L7), an eighth lens (L8) and a ninth lens (L9), the seventh lens (L7) and the ninth lens (L9) are plastic aspheric lenses, and the lens system is characterized in that the focal length Fb of the zoom lens group and the focal length ft of the telescope end of the zoom lens satisfy the following conditional expression: fb/ft is less than or equal to 1.17 and 1.12;
the focal power of the first lens (L1) and the second lens (L2) are negative, and the focal power of the third lens (L3) is positive;
the optical power of the fourth lens (L4) and the eighth lens (L8) are positive, and the optical power of the fifth lens (L5), the sixth lens (L6), the seventh lens (L7) and the ninth lens (L9) are negative.
2. Zoom lens according to claim 1, characterized in that the fourth lens (L4) and the fifth lens (L5) are cemented together to form a cemented lens group.
3. The zoom lens according to claim 2, wherein a conditional expression is satisfied between a focal length Fb1 of the cemented lens group and a focal length Fb of the variable magnification lens group: fb1/Fb is more than or equal to 0.93 and less than or equal to 1.16.
4. A zoom lens according to any one of claims 1 to 3, wherein a conditional expression is satisfied between a focal length Fa of the compensation lens group and a focal length Fb of the magnification-varying lens group: the absolute Fa/Fb is more than or equal to 0.81 and less than or equal to 0.84.
5. A zoom lens according to any one of claims 1 to 3, wherein a conditional expression is satisfied between a focal length Fb of the variable magnification lens group and a wide-angle end focal length fw of the zoom lens: fb/fw is more than or equal to 2.85 and less than or equal to 3.02.
6. A zoom lens according to any one of claims 1 to 3, wherein a distance Δd that the variable magnification lens group moves from a wide angle end of the zoom lens to a telephoto end of the zoom lens and a wide angle end optical total length TTL of the zoom lens satisfy a conditional expression: the delta D/TTL is less than or equal to 0.15.
7. A zoom lens according to any one of claims 1 to 3, wherein a conditional expression is satisfied between a focal length f7 of the seventh lens (L7) and a focal length f8 of the eighth lens (L8): -2.02.ltoreq.f7/f8.ltoreq.1.53.
8. A zoom lens according to any one of claims 1 to 3, wherein the refractive index nd4 and abbe number vd4 of the fourth lens (L4) satisfy the following conditional expressions, respectively: nd4 is more than or equal to 1.54 and less than or equal to 1.58; 71.18.ltoreq.vd4.ltoreq.71.88.
9. A zoom lens according to any one of claims 1 to 3, wherein, in a direction from the object side to the image side along the optical axis,
the first lens (L1) is a convex-concave lens, a plano-concave lens or a biconcave lens;
the second lens (L2) and the ninth lens (L9) are both paraxial region biconcave lenses;
the third lens (L3) and the eighth lens (L8) are both paraxial region biconvex lenses;
the fourth lens (L4) is a biconvex lens;
the fifth lens (L5) is a concave-convex lens;
the sixth lens (L6) is a paraxial region convex-concave lens or a paraxial region biconcave lens;
the seventh lens (L7) is a paraxial region convex-concave lens.
10. A zoom lens according to any one of claims 1-3, wherein the second lens (L2), the third lens (L3), the sixth lens (L6) and the eighth lens (L8) are all plastic aspherical lenses.
11. A zoom lens according to any one of claims 1 to 3, wherein a conditional expression is satisfied between an optical effective diameter d1 of the first lens (L1) and a wide-angle end optical total length TTL of the zoom lens: d1/TTL is less than or equal to 0.30.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176652A (en) * | 2021-04-26 | 2021-07-27 | 嘉兴中润光学科技股份有限公司 | Large-aperture vehicle-mounted lens and image pickup device |
| CN113238366A (en) * | 2021-04-25 | 2021-08-10 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN215575898U (en) * | 2021-06-16 | 2022-01-18 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN217587748U (en) * | 2022-06-27 | 2022-10-14 | 舜宇光学(中山)有限公司 | Zoom lens |
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| JP3559526B2 (en) * | 2001-01-11 | 2004-09-02 | ペンタックス プレシジョン株式会社 | Variable focal length lens |
| JP5567224B2 (en) * | 2011-11-09 | 2014-08-06 | 富士フイルム株式会社 | Endoscope objective lens and endoscope |
| JP6780438B2 (en) * | 2016-10-20 | 2020-11-04 | セイコーエプソン株式会社 | Projection zoom lens and projection type image display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113238366A (en) * | 2021-04-25 | 2021-08-10 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN113176652A (en) * | 2021-04-26 | 2021-07-27 | 嘉兴中润光学科技股份有限公司 | Large-aperture vehicle-mounted lens and image pickup device |
| CN215575898U (en) * | 2021-06-16 | 2022-01-18 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN217587748U (en) * | 2022-06-27 | 2022-10-14 | 舜宇光学(中山)有限公司 | Zoom lens |
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