CN115079389A - Zoom lens - Google Patents
Zoom lens Download PDFInfo
- Publication number
- CN115079389A CN115079389A CN202210745180.0A CN202210745180A CN115079389A CN 115079389 A CN115079389 A CN 115079389A CN 202210745180 A CN202210745180 A CN 202210745180A CN 115079389 A CN115079389 A CN 115079389A
- Authority
- CN
- China
- Prior art keywords
- lens
- zoom
- equal
- zoom lens
- focal length
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 42
- 230000014509 gene expression Effects 0.000 claims abstract description 25
- 230000005499 meniscus Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 8
- 238000003384 imaging method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 10
- 239000011521 glass Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 230000004075 alteration Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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 invention relates to a zoom lens, which sequentially comprises the following components in the direction from an object side to an image side along an optical axis: the zoom lens system comprises a compensation lens group with negative focal power, a diaphragm and a variable power 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 variable power 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 variable power lens group and the telephoto end focal length ft of the zoom lens satisfy the conditional expression: 1.12< Fb/ft is less than or equal to 1.17. The zoom lens realizes 3-time zooming under the condition of a certain total length, has high-resolution imaging and infrared confocal functions, has a wide-angle of view exceeding 120 degrees, has no dark angle in the zooming process, is efficient in zooming, is small in size and low in cost, and can be compatible with various windows.
Description
Technical Field
The invention relates to the technical field of optical systems and device design, in particular to a zoom lens.
Background
The zoom lens is an optical lens with continuously changing focal length, unchanged image surface position and excellent image quality. Due to the characteristic of variable focal length, the method is widely applied to the fields of security, monitoring, traffic and the like, and can realize the search of a large view field and the detailed investigation of a small view field. 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, high performance zoom lenses having high resolution, large aperture, day and night confocal mode, and high and low temperature confocal mode have been proposed by various manufacturers, which has made higher demands on the development and manufacture of zoom lenses.
However, in the high-resolution, large-aperture, day-night confocal, high-low temperature confocal zoom lenses available in the market, the light-passing aperture of the front group of lenses is usually large, so that the head is large in size and poor in compatibility, and cannot be matched with the camera assembly of the old product. The products with high compatibility and high performance are often high in cost and price, and are difficult to popularize in a large scale. Therefore, the existing zoom lens has the characteristics of high compatibility, high performance and low cost which are difficult to realize simultaneously.
Disclosure of Invention
In order to solve the problems of the prior art, the present invention aims to provide a high-definition zoom lens with low cost, small volume, infrared confocal and wide-angle end field angle exceeding 120 °.
To achieve the above object, the present invention provides a zoom lens, sequentially comprising, in a direction from an object side to an image side along an optical axis: the focal power is negative compensation lens group, diaphragm and focal power are positive variable power lens group, compensation lens group includes first lens, second lens and third lens in proper order, variable power lens group includes fourth lens, fifth lens, sixth lens, seventh lens, eighth lens and ninth lens in proper order, the seventh lens with the ninth lens are plastic aspheric lens, variable power lens group's focus Fb with satisfy the conditional expression between the focus ft of the telescope end of zoom: fb/ft is more than 1.12 and less than or equal to 1.17.
According to one aspect of the invention, the optical powers of the first and second lenses are both negative and the optical power of the third lens is positive.
According to an aspect of the present invention, the optical powers of the fourth lens and the eighth lens are both positive, and the optical powers of the fifth lens, the sixth lens, the seventh lens, and the ninth lens are all negative.
According to an aspect of the present invention, the fourth lens and the fifth lens are cemented to constitute a cemented lens group.
According to an aspect of the present invention, a focal length Fb1 of the cemented lens group and a focal length Fb of the variable power lens group satisfy the conditional expression: fb1/Fb is more than or equal to 0.93 and less than or equal to 1.16.
According to an aspect of the present invention, a focal length Fa of the compensation lens group and a focal length Fb of the variable magnification lens group satisfy a conditional expression: the absolute Fa/Fb is more than or equal to 0.81 and less than or equal to 0.84.
According to an aspect of the present invention, a focal length Fb of the variable power lens group and a focal length fw of a wide-angle end of the zoom lens satisfy the conditional expression: 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 Δ D by which the variable power lens group is moved from a wide-angle end of the zoom lens to a telephoto end of the zoom lens and a total optical length TTL at the wide-angle end of the zoom lens satisfy a conditional expression: delta D/TTL is less than or equal to 0.15.
According to an aspect of the present invention, a focal length f7 of the seventh lens and a focal length f8 of the eighth lens satisfy the conditional expression: f7/f8 is more than or equal to-2.02 and less than or equal to-1.53.
According to an aspect of the present invention, the refractive index nd4 and the abbe number vd4 of the fourth lens 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 is less than or equal to vd4 is less than or equal to 71.88.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the first lens is a convex-concave lens, a plano-concave lens or a biconcave lens;
the second lens and the ninth lens are both paraxial region biconcave lenses;
the third lens and the eighth lens are both 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 an 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 an aspect of the present invention, an optical effective diameter d1 of the first lens and a total optical length TTL at a wide-angle end of the zoom lens satisfy a conditional expression: d1/TTL is less than or equal to 0.30.
According to the scheme of the invention, the focal power among the lens groups is reasonably configured, the focal power of each lens, the focal length relation among the lens groups and among the lenses, the variation range of the focal length relation and the like are accurately calculated and optimized, the aperture of the first lens is not more than phi 14mm, the zoom lens can realize 3-time zooming under the condition of certain total length, high-resolution imaging and infrared confocal are realized, the volume of the lens is compressed, the small volume is realized, various windows can be compatible, the wide-angle end of the lens is more than 120 degrees, no dark angle exists in the zooming process, and efficient zooming is realized.
According to one scheme of the invention, through selection and reasonable collocation of specific materials of the lens, the zoom optical system can still keep good resolution ratio at the high temperature of 80 ℃ and the low temperature of minus 40 ℃, and virtual focus is not generated at the high temperature and the low temperature. And through mixing the glass lens and the plastic lens, all properties of the optical system are still ensured under the condition of using few glass lenses, 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 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.
Fig. 1-1 schematically shows a configuration diagram of a zoom lens according to a first embodiment of the present invention at a wide-angle end;
fig. 1-2 schematically show a structure diagram of a telephoto end of a zoom lens according to a first embodiment of the present invention;
FIGS. 1 to 3 are schematic diagrams showing a visible Ray Fan at a wide-angle end of a zoom lens according to a first embodiment of the present invention;
FIGS. 1 to 4 are views schematically showing a visible Ray Fan at the telephoto end of the zoom lens according to the first embodiment of the present invention;
FIG. 2-1 schematically shows a configuration diagram of a zoom lens according to a second embodiment of the present invention at a wide-angle end;
FIG. 2-2 is a schematic structural diagram of a telephoto end of a zoom lens according to a second embodiment of the present invention;
FIGS. 2 to 3 are diagrams schematically showing a visible Ray Fan at the wide-angle end of a zoom lens according to a second embodiment of the present invention;
FIGS. 2 to 4 are schematic diagrams showing a visible Ray Fan at the telephoto end of the zoom lens according to the second embodiment of the present invention;
FIG. 3-1 is a schematic view showing a configuration of a wide-angle end of a zoom lens according to a third embodiment of the present invention;
FIG. 3-2 is a schematic structural diagram of a telephoto end of a zoom lens according to a third embodiment of the present invention;
3-3 schematically show a visible Ray Fan at the wide-angle end of a zoom lens according to a third embodiment of the present invention;
3-4 are schematic diagrams showing a visible Ray Fan at the telephoto end of the zoom lens according to the third embodiment of the present invention;
FIG. 4-1 is a schematic view showing a configuration of a wide-angle end of a zoom lens according to a fourth embodiment of the present invention;
FIG. 4-2 is a schematic structural view illustrating the telephoto end of the zoom lens according to the fourth embodiment of the present invention;
4-3 are diagrams schematically showing a visible Ray Fan at the wide-angle end of the zoom lens according to the fourth embodiment of the present invention;
fig. 4 to 4 schematically show a visible Ray Fan at the telephoto end of the zoom lens according to the fourth embodiment of the present invention.
Detailed Description
The embodiments described in this specification are to be considered in all respects as illustrative and not restrictive, and the accompanying drawings are intended to be part of the entire 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 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 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 compensation lens group with negative focal power, a diaphragm and a zoom lens group with positive focal power. The compensation lens group sequentially comprises a first lens L1, a second lens L2 and a third lens L3, and the variable power 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 present invention, the focal 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 focal 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 double cemented 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. By reasonably distributing the focal power among the groups, the method is beneficial to improving the transmissibility of light rays and better realizing focusing and zooming.
In the embodiment of the present invention, a focal length Fb of the variable power lens group and a focal length fw of the wide-angle end of the zoom lens satisfy the 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 conditional expression: 1.12< Fb/ft is less than or equal to 1.17. By reasonably setting the relationship between the focal length of the zoom lens group and the focal length of the wide-angle end and the telephoto end of the lens respectively, a large zoom ratio can be realized as far as possible under the condition of a certain total lens length, specifically 3-time zooming can be realized, the total lens length can be better limited, and the size of the lens is reduced.
In the embodiment of the invention, the distance delta D of the variable power lens group moving 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: delta D/TTL is less than or equal to 0.15. The arrangement can realize large zoom ratio by small group interval variation, improve zoom efficiency, compress the total length of the lens and realize the 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 power lens group satisfy the conditional expression: fb1/Fb is more than or equal to 0.93 and less than or equal to 1.16. Through the focal power of rational distribution cemented lens group, can further promote the transmissibility of the light of compensation lens group to zoom lens group, reduce the volume of camera lens zoom lens group, can realize high-efficient zooming, can also realize lightness and handy and reduction in production cost.
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: f7/f8 is more than or equal to-2.02 and less than or equal to-1.53. The arrangement of the positive and negative focal powers of the seventh lens L7 and the eighth lens L8 is beneficial to aberration correction, and compensation of the zoom lens in a high and 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 is less than or equal to vd4 is less than or equal to 71.88. The fourth lens L4 made of the material can further correct chromatic aberration of the lens, so that purple edges of the lens are well balanced, and visible and infrared complete confocal is realized.
In the embodiment of the present invention, the first lens L1 is a convex-concave lens, a plano-concave lens, or a biconcave lens in a direction from the object side to the image side along the optical axis; 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 meniscus 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.
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. Various aberrations of the system can be well corrected by reasonably configuring the aspheric lens and the spherical lens, 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 focus drift of the lens at high and low temperatures is perfectly compensated, so that the lens can clearly image at the extreme temperature condition, and the lens is free from virtual focus at high and low temperatures, so that the optical system can still keep good resolution at the high temperature of 80 ℃ and the low temperature of-40 ℃. Under the condition of using less 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. Through the selection of the refractive index of the lens and the reasonable configuration of the focal power, the size of the head part of the lens is greatly reduced, so that the lens has the characteristic of small volume.
In summary, the aperture of the first lens L1 in the zoom lens according to the embodiment of the present invention is not more than Φ 14mm, the zoom lens realizes 3 times zooming under a certain total length, has high resolution imaging and infrared confocal, and simultaneously compresses the volume of the lens, realizes a small volume, is compatible with various windows, the wide-angle of the lens exceeds 120 °, and the zooming process has no dark angle and is efficient in zooming. The zoom optical system can still keep good resolution ratio under the states of high temperature of 80 ℃ and low temperature of minus 40 ℃, and virtual focus is not generated at high temperature and 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 is specifically described below in four embodiments with reference to the drawings and tables. In the following embodiments, the present disclosure refers to the diaphragm as one surface, the image surface as one surface, and the double cemented lens assembly as three surfaces.
The parameters of each example specifically satisfying the above conditional expressions are shown in table 1 below:
| conditional formula (II) | Example one | Example two | EXAMPLE III | Example four |
| 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 the embodiment of the present invention, the plastic 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 a curvature at the vertex 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
Referring to fig. 1-1 and 1-2, the parameters of the zoom lens in the present embodiment are as follows:
focal length: 3.56-9.03 mm; f number: 1.77-3.17; wide-angle end TTL: 46.74 mm; wide-angle end angle: 125.29 degrees.
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 number | Surface type | Radius of curvature | Thickness of | 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 aspherical coefficients of the respective aspherical lenses of the zoom lens of the present embodiment, including: the conic surface constant K and fourth-order aspheric surface coefficient A 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric coefficient A 16 。
TABLE 3
Table 4 lists the variable interval values when the zoom lens of the present embodiment is changed from the wide-angle end to the telephoto end. Wherein D1 denotes a center distance from an image side surface of the third lens L3 to the stop in the compensation lens group, D2 denotes a center distance from the stop to an object side surface of the fourth lens L4 in the variable power lens group, and D3 denotes a center distance from an image side surface of the ninth lens L9 in the variable power lens group to the image surface.
| Surface number | Thickness of | 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
As shown in fig. 1-1 to fig. 1-4 and tables 1 to 4, in the zoom lens of this embodiment, the aperture of the first lens L1 is not more than Φ 14mm, the zoom lens realizes 3-time zooming under a certain total length, has high resolution imaging and infrared confocal, and simultaneously compresses the volume of the lens, thereby realizing small volume and compatibility with various windows, the wide-angle of the lens is 125.29 °, and the zooming process has no dark angle and high zooming efficiency. The zoom optical system can still keep good resolution ratio 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 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 zoom lens of the present embodiment has the following parameters:
focal length: 3.48-9.02 mm; f number: 1.76-3.18; wide-angle end TTL: 46.72 mm; wide-angle end 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 aspherical coefficients of respective aspherical lenses of the zoom lens of the present embodiment, including: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric coefficient A 16 。
TABLE 6
Table 7 lists the variable interval values when the zoom lens of the present embodiment is changed from the wide-angle end to the telephoto end. Wherein D1 denotes a center distance from an image side surface of the third lens L3 to the stop in the compensation lens group, D2 denotes a center distance from the stop to an object side surface of the fourth lens L4 in the variable power lens group, and D3 denotes a center distance from an image side surface of the ninth lens L9 in the variable power lens group to the image surface.
| Surface number | Thickness of | 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
As shown in fig. 2-1 to 2-4 and tables 1 and 5 to 7, in the zoom lens of this embodiment, the aperture of the first lens L1 is not more than Φ 14mm, the zoom lens realizes 3 times zooming under a certain total length, has high resolution imaging and infrared confocal, and simultaneously compresses the volume of the lens, thereby realizing small volume and compatibility with various windows, the wide-angle of the lens is 122.28 °, and no dark angle exists in the zooming process, thereby achieving high-efficiency zooming. The zoom optical system can still keep good resolution ratio 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 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 zoom lens of the present embodiment has the following parameters:
focal length: 3.52-9.02 mm; f number: 1.77-3.16; wide-angle end TTL: 46.86 mm; wide-angle end 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 aspherical coefficients of respective aspherical lenses of the zoom lens of the present embodiment, including: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric coefficient A 16 。
TABLE 9
Table 10 lists the variable interval values when the zoom lens of the present embodiment is changed from the wide-angle end to the telephoto end. Wherein D1 denotes a center distance from an image side surface of the third lens L3 to the stop in the compensation lens group, D2 denotes a center distance from the stop to an object side surface of the fourth lens L4 in the variable power lens group, and D3 denotes a center distance from an image side surface of the ninth lens L9 in the variable power lens group to the image surface.
| Surface number | Thickness of | Wide angle end | Telescope end |
| 6 | D1 | 11.25 | 2.64 |
| 7 | D2 | 6.87 | 0.20 |
| 18 | D3 | 5.71 | 12.38 |
Watch 10
As shown in fig. 3-1 to 3-4 and tables 1 and 8 to 10, in the zoom lens of this embodiment, the aperture of the first lens L1 is not more than Φ 14mm, the zoom lens realizes 3 times zooming under a certain total length, has both high-resolution imaging and infrared confocal, and simultaneously compresses the volume of the lens, thereby realizing a small volume and compatibility with various windows, the wide-angle of the lens is 124.61 °, and no dark angle is generated during zooming, thereby achieving high-efficiency zooming. The zoom optical system can still keep good resolution ratio 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 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 four
Referring to fig. 4-1 and 4-2, the zoom lens of the present embodiment has the following parameters:
focal length: 3.50-9.02 mm; f number: 1.77-3.16; wide-angle end TTL: 46.80 mm; wide-angle end 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 number | Surface type | Radius of curvature | Thickness of | 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 aspherical coefficients of respective aspherical lenses of the zoom lens of the present embodiment, including: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 Fourteen-order aspheric surface coefficient A 14 And a sixteen-order aspheric coefficient A 16 。
TABLE 12
Table 13 lists the variable interval values when the zoom lens of the present embodiment is changed from the wide-angle end to the telephoto end. Wherein D1 denotes a center distance from an image side surface of the third lens L3 to the stop in the compensation lens group, D2 denotes a center distance from the stop to an object side surface of the fourth lens L4 in the variable power lens group, and D3 denotes a center distance from an image side surface of the ninth lens L9 in the variable power lens group to the image surface.
| Surface number | Thickness of | Wide angle end | Telescope end |
| 6 | D1 | 11.44 | 2.64 |
| 7 | D2 | 6.97 | 0.20 |
| 18 | D3 | 6.14 | 12.91 |
Watch 13
As shown in fig. 4-1 to 4-4 and tables 1 and 11 to 13, in the zoom lens of this embodiment, the aperture of the first lens L1 is not more than Φ 14mm, the zoom lens realizes 3 times zooming under a certain total length, has high resolution imaging and infrared confocal, and simultaneously compresses the volume of the lens, thereby realizing a small volume and compatibility with various windows, the wide-angle of the lens is 124.29 °, and no dark angle exists in the zooming process, thereby achieving high-efficiency zooming. The zoom optical system can still keep good resolution ratio 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 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 above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (13)
1. A zoom lens includes, in order from an object side to an image side along an optical axis: the utility model provides a zoom lens group, its characterized in that, the focal power is negative compensation lens group, diaphragm and focal power are positive zoom lens group, compensation lens group includes first lens (L1), second lens (L2) and third lens (L3) in proper order, zoom lens group includes fourth lens (L4), fifth lens (L5), sixth lens (L6), seventh lens (L7), eighth lens (L8) and ninth lens (L9) in proper order, seventh lens (L7) and ninth lens (L9) are plastic aspheric lens, its characterized in that, zoom lens group's focus Fb with satisfy the terms between zoom lens's the distal end focus ft: 1.12< Fb/ft is less than or equal to 1.17.
2. The zoom lens according to claim 1, wherein the optical powers of the first lens (L1) and the second lens (L2) are both negative, and the optical power of the third lens (L3) is positive.
3. A zoom lens according to claim 1, wherein the optical powers of the fourth lens (L4) and the eighth lens (L8) are all positive, and the optical powers of the fifth lens (L5), the sixth lens (L6), the seventh lens (L7) and the ninth lens (L9) are all negative.
4. A zoom lens according to claim 1, wherein the fourth lens (L4) and the fifth lens (L5) are cemented to constitute a cemented lens group.
5. The zoom lens according to claim 4, wherein a focal length Fb1 of the cemented lens group and a focal length Fb of the variable power lens group satisfy the conditional expression: fb1/Fb is more than or equal to 0.93 and less than or equal to 1.16.
6. The zoom lens according to any one of claims 1 to 5, wherein a focal length Fa of the compensation lens group and a focal length Fb of the variable power lens group satisfy a conditional expression: the absolute Fa/Fb is more than or equal to 0.81 and less than or equal to 0.84.
7. A zoom lens according to any one of claims 1-5, wherein a focal length Fb of the variable power lens group and a wide-angle end focal length fw of the zoom lens satisfy the conditional expression: fb/fw is more than or equal to 2.85 and less than or equal to 3.02.
8. A zoom lens according to any one of claims 1-5, wherein a distance Δ D by which the variable power lens group is moved 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: delta D/TTL is less than or equal to 0.15.
9. The zoom lens according to any one of claims 1 to 5, wherein a focal length f7 of the seventh lens (L7) and a focal length f8 of the eighth lens (L8) satisfy a conditional expression: f7/f8 is more than or equal to-2.02 and less than or equal to-1.53.
10. A zoom lens according to any one of claims 1 to 5, 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; vd4 is more than or equal to 71.18 and less than or equal to 71.88.
11. The zoom lens according to any one of claims 1 to 5, 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 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 meniscus 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.
12. A zoom lens according to any one of claims 1 to 5, wherein the second lens (L2), the third lens (L3), the sixth lens (L6) and the eighth lens (L8) are all plastic aspherical lenses.
13. A zoom lens according to any one of claims 1-5, wherein the optical effective diameter d1 of the first lens (L1) and the wide-angle end total optical length TTL of the zoom lens satisfy the conditional expression: d1/TTL is less than or equal to 0.30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210745180.0A CN115079389B (en) | 2022-06-27 | 2022-06-27 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210745180.0A CN115079389B (en) | 2022-06-27 | 2022-06-27 | Zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115079389A true CN115079389A (en) | 2022-09-20 |
| CN115079389B CN115079389B (en) | 2024-02-23 |
Family
ID=83255420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210745180.0A Active CN115079389B (en) | 2022-06-27 | 2022-06-27 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115079389B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020126393A1 (en) * | 2001-01-11 | 2002-09-12 | Asahi Seimitsu Kabushiki Kaisha | Variable-focus lens system |
| US20140218811A1 (en) * | 2011-11-09 | 2014-08-07 | Fujifilm Corporation | Endoscope objective lens and endoscope |
| US20180113286A1 (en) * | 2016-10-20 | 2018-04-26 | Seiko Epson Corporation | Projection zoom lens and projection type image display device |
| 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 |
-
2022
- 2022-06-27 CN CN202210745180.0A patent/CN115079389B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020126393A1 (en) * | 2001-01-11 | 2002-09-12 | Asahi Seimitsu Kabushiki Kaisha | Variable-focus lens system |
| US20140218811A1 (en) * | 2011-11-09 | 2014-08-07 | Fujifilm Corporation | Endoscope objective lens and endoscope |
| US20180113286A1 (en) * | 2016-10-20 | 2018-04-26 | Seiko Epson Corporation | Projection zoom lens and projection type image display device |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115079389B (en) | 2024-02-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107632379B (en) | Small ultra-large aperture starlight level ultra-wide angle zoom lens | |
| CN110488473B (en) | Miniaturized large-aperture large-target-surface high-resolution zoom lens | |
| CN113126267A (en) | Zoom lens | |
| CN111562662A (en) | Zoom lens | |
| CN215575898U (en) | Zoom lens | |
| CN217587748U (en) | Zoom lens | |
| CN217767016U (en) | Zoom lens | |
| CN211014817U (en) | Zoom lens | |
| CN115236843B (en) | Zoom lens | |
| CN114967083B (en) | Zoom lens | |
| CN218158534U (en) | Zoom lens | |
| CN111562664A (en) | Zoom lens | |
| CN110488472B (en) | Zoom optical system | |
| CN115494627A (en) | Fixed focus lens | |
| CN111562663B (en) | Zoom lens | |
| CN114895443A (en) | Zoom lens | |
| CN115079389B (en) | Zoom lens | |
| CN114019656A (en) | Small wide-angle high-low temperature day and night confocal lens | |
| CN114089522A (en) | Zoom lens | |
| CN114047597A (en) | Fixed-focus optical lens and imaging method thereof | |
| CN113534424A (en) | Zoom lens | |
| CN112904543A (en) | Zoom lens | |
| CN217879799U (en) | Zoom lens | |
| CN112346227A (en) | Zoom lens | |
| CN116819742B (en) | Zoom lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |