CN112305730B - Zoom lens - Google Patents
Zoom lens Download PDFInfo
- Publication number
- CN112305730B CN112305730B CN202011130141.7A CN202011130141A CN112305730B CN 112305730 B CN112305730 B CN 112305730B CN 202011130141 A CN202011130141 A CN 202011130141A CN 112305730 B CN112305730 B CN 112305730B
- Authority
- CN
- China
- Prior art keywords
- lens
- group
- zoom
- zoom lens
- equal
- 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.)
- Active
Links
- 230000003287 optical effect Effects 0.000 claims description 72
- 230000014509 gene expression Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 27
- 239000000463 material Substances 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000004304 visual acuity Effects 0.000 description 2
- 239000006059 cover glass Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
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
- G02B15/145—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 +-+++
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- 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
- G02B15/20—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 having an additional movable lens or lens group for varying the objective focal length
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
The invention relates to a zoom lens, which sequentially comprises a first fixed group (G1) with positive focal power, a first movable zoom group (G2) with negative focal power, an aperture STOP (STOP), a second fixed group (G3) with positive focal power, a first focusing group (G4) with positive focal power and a second focusing group (G5) with positive focal power along the direction from an object side to an image side. The zoom lens has the characteristics of large aperture, large image plane and large multiplying power, and simultaneously gives consideration to day and night confocal and no virtual focus in the temperature range of-40 ℃ to 80 ℃.
Description
Technical Field
The invention relates to the technical field of optical system and device design, in particular to a zoom lens.
Background
The optical lens is an indispensable component in the security system, the overall performance of the security system is determined by the performance of the lens, and along with the rapid growth of population, the security field can develop towards the intelligent direction, so that higher requirements are put on the imaging quality of the optical lens, such as aperture, resolution, day-night confocal of a zoom range and the like.
The following disadvantages are common in the monitoring lenses on the market at present: small image surface, low resolution, poor image quality and small aperture. In general, the image surface is large, the volume of the whole module is large, and the whole module is mostly a fixed focus lens and cannot adapt to the application field of frequent change of the monitoring distance. The aperture of the lens is increased, and meanwhile, the aperture of the lens also represents that the aperture of the light passing aperture can be increased, so that aberration is difficult to optimize, namely, the existing lens cannot meet the requirements of large relative aperture, day-night confocal, no virtual focus in high and low temperature environments and high image quality.
Disclosure of Invention
The present invention aims to solve the above problems and provide a large aperture, large image plane, and large magnification zoom lens.
In order to achieve the above object, the present invention provides a zoom lens, which sequentially includes, in a direction from an object side to an image side, a first fixed group having positive optical power, a first movable zoom group having negative optical power, an aperture stop, a second fixed group having positive optical power, a first focusing group having positive optical power, and a second focusing group Jiao Qun having positive optical power.
According to one aspect of the present invention, the first fixed group includes, in an object-side to image-side direction, a first lens having negative optical power, a second lens having positive optical power, a third lens having positive optical power, and a fourth lens having positive optical power in this order.
According to one aspect of the present invention, the first fixed group includes at least one doublet lens.
According to one aspect of the invention, the first and second lenses form a double cemented lens.
According to an aspect of the present invention, the first movable zoom group includes, in an object-side to image-side direction, a fifth lens having negative optical power, a sixth lens having negative optical power, a seventh lens having positive optical power, and an eighth lens having negative optical power, in this order.
According to one aspect of the present invention, the second fixed group includes, in order in an object-side to image-side direction, a ninth lens having positive optical power and a tenth lens having negative optical power.
According to one aspect of the present invention, the first focusing group includes, in an object-side to image-side direction, an eleventh lens having positive optical power, a twelfth lens having negative optical power, a thirteenth lens having positive optical power, a fourteenth lens having positive optical power, a fifteenth lens having negative optical power, and a sixteenth lens having negative optical power, in this order.
According to one aspect of the invention, the first focus group comprises at least one doublet lens.
According to an aspect of the present invention, the refractive index Nd14 and abbe number VD14 of the fourteenth lens satisfy: nd14 is more than or equal to 1.70 and less than or equal to 1.95, vd14 is more than or equal to 20 and less than or equal to 50, and the refractive index Nd14 of the fourteenth lens, the refractive index Nd12 of the twelfth lens, the refractive index Nd13 of the thirteenth lens and the refractive index Nd15 of the fifteenth lens respectively satisfy the relation: nd14 > Nd12, nd14 > Nd13, and Nd14 > Nd15.
According to one aspect of the present invention, at least one lens having positive optical power is included in the second group Jiao Qun along the object-side to image-side direction.
According to one aspect of the present invention, at least two lenses in the zoom lens are aspherical lenses.
According to one aspect of the present invention, the focal lengths of the first fixed group, the first movable zoom group, the second fixed group, the first focusing group, and the second focusing group are f1, f2, f3, f4, and f5, respectively, and the wide-angle end focal length of the zoom lens is fw, which satisfies the following conditions: f1/fw is more than or equal to 5 and less than or equal to 13, -4 and less than or equal to-0.5 75.ltoreq.f3? fw is less than or equal to 89 f4 is 1.5 ∈4-fw is less than or equal to 7 fw is less than or equal to 7.
According to one aspect of the present invention, the position of the aperture stop satisfies the relation: l S-IMG/TTL is more than or equal to 0.45 and less than or equal to 0.55, wherein L S-IMG represents the distance between the aperture diaphragm and the image plane, and TTL represents the total length of the zoom lens optical system.
According to one aspect of the present invention, the diameter of the largest lens in the first fixed group is Φg1, and the total length of the zoom lens optical system is TTL, which satisfies the following conditions: phi G1 is more than or equal to 0.35 TTL is less than or equal to 0.45.
According to one aspect of the present invention, the first movable zoom group has a moving distance D from the wide-angle end to the telephoto end, and the total length of the zoom lens optical system is TTL, which satisfies the following conditions: D/TTL is more than or equal to 0.2 and less than or equal to 0.3.
The zoom lens is arranged according to the definition, and the aspherical lens made of plastic materials is used, so that the production cost of the lens is reduced. By adopting the scheme that the aspherical lens and the glass spherical lens are matched with each other, the aberration of the lens is effectively corrected, so that the lens is free from virtual focus in the temperature range of-40 ℃ to 80 ℃. Meanwhile, the large zoom range of FNO less than or equal to 1.8 and 35X can be realized, so that the lens can be used day and night, the contradiction between large relative aperture, day and night confocal, high and low temperature virtual focus and resolving power is overcome, the application occasion and environmental condition range of the lens are increased, and the quality and competitiveness of the lens product are improved.
Drawings
Fig. 1 schematically shows a structural diagram of a zoom lens according to embodiment 1 of the present invention;
Fig. 2 schematically shows a wide-angle end MTF diagram of the zoom lens according to embodiment 1 of the present invention at normal temperature of 20 degrees under visible light;
Fig. 3 schematically shows a wide-angle end Through-Focus-MTF diagram of a zoom lens according to embodiment 1 of the present invention at room temperature 20 degrees, infrared at night 850 nm;
fig. 4 schematically shows a tele MTF diagram of a zoom lens according to embodiment 1 of the present invention at normal temperature of 20 degrees under visible light;
FIG. 5 schematically shows a zoom lens according to embodiment 1 of the present invention, in which the focal length of the zoom lens is at a normal temperature of 20℃and infrared at night of 850nm is Through-Focus-MTF;
Fig. 6 schematically shows a Through-Focus-MTF diagram of a zoom lens according to embodiment 1 of the present invention at a low-40 degree, wide-angle end in visible light;
fig. 7 schematically shows a Through-Focus-MTF diagram of a zoom lens according to embodiment 1 of the present invention at a wide-angle end at 80 degrees under visible light at high temperature;
FIG. 8 schematically shows a Through-Focus-MTF diagram of a zoom lens according to embodiment 1 of the present invention at a low temperature of-40 degrees at a telephoto end under visible light;
FIG. 9 schematically shows a Through-Focus-MTF diagram of a zoom lens according to embodiment 1 of the present invention at a high temperature of 80℃at a telephoto end under visible light;
fig. 10 schematically shows a structural diagram of a zoom lens according to embodiment 2 of the present invention;
fig. 11 schematically shows a wide-angle end MTF diagram of a zoom lens according to embodiment 2 of the present invention at normal temperature of 20 degrees under visible light;
FIG. 12 schematically shows a wide-angle end Through-Focus-MTF diagram of a zoom lens according to embodiment 2 of the present invention at room temperature of 20℃and infrared at night of 850 nm;
fig. 13 schematically shows a tele MTF diagram of a zoom lens according to embodiment 2 of the present invention at normal temperature of 20 degrees under visible light;
FIG. 14 schematically shows a zoom lens according to embodiment 2 of the present invention, in which the focal length of the zoom lens is at a normal temperature of 20℃and infrared light at night of 850nm is Through-Focus-MTF;
Fig. 15 schematically shows a Through-Focus-MTF diagram of a zoom lens according to embodiment 2 of the present invention at a low-40 degree, visible light wide-angle end;
Fig. 16 schematically shows a Through-Focus-MTF diagram of a zoom lens according to embodiment 2 of the present invention at a wide-angle end under visible light at a high temperature of 80 degrees;
FIG. 17 schematically shows a Through-Focus-MTF diagram of a zoom lens according to embodiment 2 of the present invention at a low temperature of-40℃at a telephoto end under visible light;
FIG. 18 schematically shows a Through-Focus-MTF diagram of a zoom lens according to embodiment 2 of the present invention at a high temperature of 80℃at a telephoto end under visible light;
fig. 19 schematically shows a structural diagram of a zoom lens according to embodiment 3 of the present invention;
Fig. 20 schematically shows a wide-angle end MTF diagram of a zoom lens according to embodiment 3 of the present invention at normal temperature of 20 degrees under visible light;
FIG. 21 schematically shows a wide-angle end Through-Focus-MTF diagram of a zoom lens according to embodiment 3 of the present invention at room temperature of 20℃and infrared at night of 850 nm;
Fig. 22 schematically shows a tele MTF diagram of a zoom lens according to embodiment 3 of the present invention at normal temperature of 20 degrees under visible light;
FIG. 23 schematically shows a zoom lens according to embodiment 3 of the present invention, in which the focal length of the zoom lens is at a normal temperature of 20℃and infrared light at night of 850nm is Through-Focus-MTF;
fig. 24 schematically shows a Through-Focus-MTF diagram of a zoom lens according to embodiment 3 of the present invention at a low-40 degree, visible light wide-angle end;
Fig. 25 schematically shows a Through-Focus-MTF diagram of a zoom lens according to embodiment 3 of the present invention at a wide-angle end under visible light at a high temperature of 80 degrees;
FIG. 26 schematically shows a Through-Focus-MTF diagram of a zoom lens according to embodiment 3 of the present invention at a low temperature of-40℃at a telephoto end under visible light;
fig. 27 schematically shows a Through-Focus-MTF diagram of a zoom lens according to embodiment 3 of the present invention at a high temperature of 80 degrees at a telephoto end under visible light.
Detailed Description
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.
The present invention will be described in detail below with reference to the drawings and the specific embodiments, which are not described in detail herein, but the embodiments of the present invention are not limited to the following embodiments.
Referring to the drawings, the present invention provides a zoom lens including, in order from an object side to an image side, a first fixed group G1 having positive optical power, a first movable zoom group G2 having negative optical power, an aperture STOP, a second fixed group G3 having positive optical power, a first focusing group G4 having positive optical power, and a second focusing group G Jiao Qun having positive optical power.
In the zoom lens of the present invention, the first movable zoom group G2 is moved along the optical axis, so that the optical system is changed from the wide angle to the telephoto, and the movement of the image plane due to the zoom is corrected by the movement of the focusing lens groups G4 and G5 along the optical axis.
Referring to fig. 1, in the zoom lens of the present invention, a first fixed group G1 includes, in order from an object side to an image side, a first lens L1 having negative optical power, a second lens L2 having positive optical power, a third lens L3 having positive optical power, and a fourth lens L4 having positive optical power. In the zoom lens of the present invention, the first fixed group G1 includes at least one lens assembly, and according to an embodiment of the present invention, the first lens L1 and the second lens L2 form a lens assembly.
In the zoom lens of the present invention, the first movable zoom group G2 includes, in order from the object side to the image side, a fifth lens L5 having negative optical power, a sixth lens L6 having negative optical power, a seventh lens L7 having positive optical power, and an eighth lens L8 having negative optical power.
The second fixed group G3 sequentially includes a ninth lens L9 having positive optical power and a tenth lens L10 having negative optical power along the object-side to image-side direction.
The first focusing group G4 includes, in the object-side to image-side direction, an eleventh lens L11 having positive optical power, a twelfth lens L12 having negative optical power, a thirteenth lens L13 having positive optical power, a fourteenth lens L14 having positive optical power, a fifteenth lens L15 having negative optical power, and a sixteenth lens L16 having negative optical power in this order. According to the inventive concept, the first focus group G4 comprises at least one doublet lens.
In the present invention, the refractive index Nd14 and abbe number VD14 of the fourteenth lens L14 satisfy: 1.70 Nd14 is less than or equal to 1.95, vd14 is less than or equal to 20 and less than or equal to 50, and the refractive index Nd14 of the fourteenth lens L14 and the refractive index Nd12 of the twelfth lens L12, the refractive index Nd13 of the thirteenth lens L13 and the refractive index Nd15 of the fifteenth lens L15 satisfy the relation: nd14 > Nd12, nd14 > Nd13, and Nd14 > Nd15.
In the zoom lens of the present invention, at least one lens having positive focal power is included in the second focusing group G5 along the object side to image side direction. As shown in fig. 1, according to one embodiment of the present invention, the second group Jiao Qun G5 includes a seventeenth lens L17 and an eighteenth lens L18, at least one of which has positive optical power. Of course, according to other embodiments of the present invention, the second group Jiao Qun of lenses G5 may include only one seventeenth lens L17 having positive power, and more than two lenses may be provided, at least one of which is a positive power lens.
In the zoom lens of the present invention, at least two of the lenses included are aspherical lenses, and aspherical surfaces satisfy:
Wherein z is the axial distance from the curved surface to the vertex at the position with the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical curved surface; k is a conic coefficient; a4, A6, A8, a10, a12 represent fourth order, sixth order, eighth order, tenth order, and twelfth order aspheric coefficients, respectively.
The focal lengths of the first fixed group G1, the first movable zoom group G2, the second fixed group G3, the first focusing group G4 and the second focusing group Jiao Qun are f1, f2, f3, f4 and f5 respectively, and the focal length of the wide-angle end of the zoom lens is fw, so that the following conditions are satisfied: f1/fw is more than or equal to 5 and less than or equal to 13, -4 and less than or equal to-0.5 75.ltoreq.f3? fw is less than or equal to 89 f4 is 1.5 ∈4-fw is less than or equal to 7 fw is less than or equal to 7.
In the zoom lens of the present invention, the position of the aperture STOP satisfies the relation: l S-IMG/TTL is more than or equal to 0.45 and less than or equal to 0.55, wherein L S-IMG represents the distance between the aperture STOP STOP and the image plane, and TTL represents the total length of the zoom lens optical system. The diameter Φg1 of the largest lens in the first fixed group G1 and the total length TTL of the optical system satisfy: phi G1 is more than or equal to 0.35 TTL is less than or equal to 0.45. The first movable zoom group G2 has a moving distance D from the wide-angle end to the telephoto end and a total length TTL of the zoom lens optical system satisfying: D/TTL is more than or equal to 0.2 and less than or equal to 0.3.
In summary, the zoom lens of the present invention is configured as defined above, and uses an aspherical lens made of plastic, so as to reduce the production cost of the lens of the present invention. By adopting the scheme that the aspherical lens and the glass spherical lens are matched with each other, the aberration of the lens is effectively corrected, so that the lens is free from virtual focus in the temperature range of-40 ℃ to 80 ℃. Meanwhile, the large zoom range of FNO less than or equal to 1.8 and 35X can be realized, so that the lens can be used day and night, the contradiction between large relative aperture, day and night confocal, high and low temperature virtual focus and resolving power is overcome, the application occasion and environmental condition range of the lens are increased, and the quality and competitiveness of the lens product are improved.
The following sets of 3 embodiments are given to specifically explain a zoom lens according to the present invention according to the above-described arrangement of the present invention.
Three sets of embodiment data are shown in table 1 below:
TABLE 1
Embodiment one:
Fig. 1 is a block diagram schematically showing a zoom lens according to a first embodiment of the present invention.
Table 2 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number:
TABLE 2
In the present embodiment, the second group Jiao Qun includes two lenses, namely, a seventeenth lens L17 and an eighteenth lens L18. Wherein the first lens L1 and the second lens L2 constitute a cemented doublet, the sixth lens L6 and the seventh lens L7 constitute a cemented doublet, the twelfth lens L12 and the thirteenth lens L13 constitute a cemented doublet, the fourteenth lens L14 and the fifteenth lens L15 constitute a cemented doublet, and the eleventh lens L11 and the eighteenth lens L18 are aspherical lenses.
Table 3 shows the aspherical coefficients of each aspherical lens in this example, K is the quadric constant of the surface, A, B, C, D, E is the fourth, sixth, eighth, tenth and tenth order, respectively.
| Face number | K | A | B | C | D | E |
| S20 | -1.993 | 0.00E+00 | 9.21E-4 | -9.15E-6 | 4.56E-8 | -2.54E-12 |
| S21 | -41.011 | 0.00E+00 | -4.95E-6 | 1.21E-7 | -4.68E-9 | 1.47E-13 |
| S32 | 1.489 | 0.00E+00 | -5.67E-5 | -1.118E-6 | 1.25E-8 | -1.51E-10 |
| S33 | -1.215 | 0.00E+00 | 2.65E-5 | -7.26E-7 | 1.15E-8 | -9.623E-11 |
Table 3 table 4 shows distances between groups at the wide angle end and the telephoto end of the zoom lens in the present embodiment:
| Thickness of (L) | Wide angle end | Telescope end |
| D1 | 1.015 | 35.016 |
| D2 | 35.360 | 1.360 |
| D3 | 21.161 | 0.661 |
| D4 | 2.375 | 22.875 |
| D5 | 3.221 | 3.222 |
TABLE 4 Table 4
As shown in table 4, "D1" represents the measured distance from the image side of the first fixed group G1 to the first movable zoom group G2, "D2" represents the measured distance from the image side of the first movable zoom group G2 to the aperture, "D3" represents the measured distance from the image side of the second fixed group G3 to the first focus group G4, "D4" represents the measured distance from the image side of the first focus group G4 to the second focus group Jiao Qun G5, and "D5" represents the measured distance from the image side of the second focus group Jiao Qun to the cover glass CG. Wherein "D1", "D2", "D3", "D4", "D5" are different depending on the wide-angle end and the telephoto end.
As can be seen from fig. 2 to 9, the zoom lens of embodiment 1 has the characteristics of large aperture, large image plane, and large magnification, and is capable of confocal day and night and without virtual focus in the temperature range of-40 ℃ to 80 ℃.
Embodiment two:
fig. 10 is a block diagram schematically showing a zoom lens according to a second embodiment of the present invention.
Table 5 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number:
TABLE 5
In the present embodiment, the second group Jiao Qun includes two lenses, namely, a seventeenth lens L17 and an eighteenth lens L18. Wherein the first lens L1 and the second lens L2 constitute a cemented doublet, the sixth lens L6 and the seventh lens L7 constitute a cemented doublet, the twelfth lens L12 and the thirteenth lens L13 constitute a cemented doublet, the fourteenth lens L14 and the fifteenth lens L15 constitute a cemented doublet, and the eighth lens L8 and the eleventh lens L11 are aspherical lenses.
Table 6 shows the aspherical coefficients of each aspherical lens in this example, K is the quadric constant of the surface, A, B, C, D, E is the fourth, sixth, eighth, tenth and tenth order, respectively.
| Face number | K | A | B | C | D | E |
| S13 | -15.75 | 0.00E+00 | 2.01E-5 | -8.58E-8 | 3,86E-10 | -5.78E-12 |
| S14 | -1.738 | 0.00E+00 | 5.21E-4 | 6.58E-8 | 7.21E-10 | 5.21E-11 |
| S20 | -0.985 | 0.00E+00 | 6.58E-5 | -9.25E-8 | 3.58E-10 | 5.65E-12 |
| S21 | -25.968 | 0.00E+00 | -3.56E-4 | -5.69E-8 | -6.98E-11 | 5.68E-13 |
Table 6 table 7 shows distances between groups at the wide angle end and the telephoto end of the zoom lens in the present embodiment:
| Thickness of (L) | Wide angle end | Telescope end |
| D1 | 0.616 | 31.958 |
| D2 | 32.511 | 1.169 |
| D3 | 21.461 | 0.781 |
| D4 | 2.876 | 22.575 |
| D5 | 2.1 | 3.081 |
TABLE 7
As can be seen from fig. 2 to 9, the zoom lens of embodiment 2 has the characteristics of large aperture, large image plane, and large magnification, and can achieve confocal between day and night and no virtual focus in the temperature range of-40 ℃ to 80 ℃.
Embodiment III:
fig. 19 is a block diagram schematically showing a zoom lens according to a third embodiment of the present invention.
Table 8 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number:
TABLE 8
In the present embodiment, the second group Jiao Qun includes one lens, which is the seventeenth lens L17. Wherein the first lens L1 and the second lens L2 constitute a cemented doublet, the sixth lens L6 and the seventh lens L7 constitute a cemented doublet, the twelfth lens L12 and the thirteenth lens L13 constitute a cemented doublet, the fourteenth lens L14 and the fifteenth lens L15 constitute a cemented doublet, and the eleventh lens L11 and the seventeenth lens L17 are aspherical lenses.
Table 9 shows the aspherical coefficients of each aspherical lens in this example, K is the quadric constant of the surface, A, B, C, D, E is the fourth, sixth, eighth, tenth and tenth order, respectively.
| Face number | K | A | B | C | D | E |
| S20 | -10.356 | 0.00E+00 | 1.05E-5 | -6.56E-8 | 2.89E-10 | -5.23E-13 |
| S21 | -1.656 | 0.00E+00 | 8.14E-5 | -5.29E-8 | 9.52E-9 | -3.26E-11 |
| S30 | -1.925 | 0.00E+00 | 3.375E-5 | -4.81E-8 | 9.21E-10 | -1.05E-12 |
| S31 | -31.056 | 0.00E+00 | -4.95E-4 | 2.89E-7 | -4.21E-10 | 1.89E-13 |
TABLE 9
Table 10 shows distances between groups at the wide-angle end and the telephoto end of the zoom lens in the present embodiment:
| Thickness of (L) | Wide angle end | Telescope end |
| D1 | 0.568 | 31.08 |
| D2 | 31.161 | 0.649 |
| D3 | 20.489 | 0.759 |
| D4 | 2.555 | 21.256 |
| D5 | 3.198 | 4.227 |
Table 10
As can be seen from fig. 2 to 9, the zoom lens of embodiment 3 has the characteristics of large aperture, large image plane, and large magnification, and is capable of confocal day and night and without virtual focus in the temperature range of-40 ℃ to 80 ℃.
The above description is only one embodiment of the present invention and is not intended to limit the present invention, and various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A zoom lens, characterized by comprising, in order from an object side to an image side, a first fixed group (G1) having positive optical power, a first movable zoom group (G2) having negative optical power, an aperture STOP (STOP), a second fixed group (G3) having positive optical power, a first focusing group (G4) having positive optical power, and a second focusing group (G5) having positive optical power, in total, five lens groups;
The first movable zoom group (G2) sequentially comprises a fifth lens (L5) with negative focal power, a sixth lens (L6) with negative focal power, a seventh lens (L7) with positive focal power and an eighth lens (L8) with negative focal power, and the total of four lenses;
the first focusing group (G4) sequentially comprises an eleventh lens (L11) with positive focal power, a twelfth lens (L12) with negative focal power, a thirteenth lens (L13) with positive focal power, a fourteenth lens (L14) with positive focal power, a fifteenth lens (L15) with negative focal power and a sixteenth lens (L16) with negative focal power, which are six lenses in total;
the second focusing group (G5) comprises at least one lens with positive focal power.
2. The zoom lens according to claim 1, wherein the first fixed group (G1) includes, in order from the object side to the image side, a first lens (L1) having negative optical power, a second lens (L2) having positive optical power, a third lens (L3) having positive optical power, and a fourth lens (L4) having positive optical power, four lenses in total.
3. Zoom lens according to claim 2, characterized in that the first fixed group (G1) comprises at least one doublet lens.
4. A zoom lens according to claim 3, wherein the first lens (L1) and the second lens (L2) constitute a cemented doublet.
5. Zoom lens according to claim 1, wherein the second fixed group (G3) comprises, in order, a ninth lens (L9) having positive optical power and a tenth lens (L10) having negative optical power, two lenses in total, in the object-side to image-side direction.
6. Zoom lens according to claim 1, characterized in that the first focusing group (G4) comprises at least one doublet lens.
7. The zoom lens according to claim 1, wherein the refractive index Nd14 and abbe number VD14 of the fourteenth lens (L14) satisfy: 1.70.ltoreq.Nd14.ltoreq.1.95, 20.ltoreq.Vd14.ltoreq.50, and the refractive index Nd14 of the fourteenth lens (L14) and the refractive index Nd12 of the twelfth lens (L12), the refractive index Nd13 of the thirteenth lens (L13), and the refractive index Nd15 of the fifteenth lens (L15) satisfy the relational expressions, respectively: nd14 > Nd12, nd14 > Nd13, and Nd14 > Nd15.
8. The zoom lens according to any one of claims 1 to 7, wherein at least two of the lenses in the zoom lens are aspherical lenses.
9. The zoom lens according to any one of claims 1 to 7, wherein focal lengths of the first fixed group (G1), the first movable zoom group (G2), the second fixed group (G3), the first focusing group (G4), and the second focusing group (G5) are f1, f2, f3, f4, and f5, respectively, and the wide-angle end focal length of the zoom lens is fw, satisfying: f1/fw is more than or equal to 5 and less than or equal to 13, -4 and less than or equal to-0.5 75.ltoreq.f3? fw is less than or equal to 89 f4 is 1.5 ∈4-fw is less than or equal to 7 fw is less than or equal to 7.
10. Zoom lens according to any of claims 1-7, characterized in that the position of the aperture STOP (STOP) satisfies the relation: l S-IMG/TTL is more than or equal to 0.45 and less than or equal to 0.55, wherein L S-IMG represents the distance between the aperture STOP (STOP) and the image plane, and TTL represents the total length of the zoom lens optical system.
11. The zoom lens according to any one of claims 1 to 7, wherein the diameter of the largest lens in the first fixed group (G1) is Φg1, and the total length of the zoom lens optical system is TTL, satisfying: phi G1 is more than or equal to 0.35 TTL is less than or equal to 0.45.
12. A zoom lens according to any one of claims 1 to 7, wherein the first movable zoom group (G2) has a moving distance D from the wide-angle end to the telephoto end, and the total length of the zoom lens optical system is TTL, satisfying: D/TTL is more than or equal to 0.2 and less than or equal to 0.3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011130141.7A CN112305730B (en) | 2020-10-21 | 2020-10-21 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011130141.7A CN112305730B (en) | 2020-10-21 | 2020-10-21 | Zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112305730A CN112305730A (en) | 2021-02-02 |
| CN112305730B true CN112305730B (en) | 2024-08-23 |
Family
ID=74328313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011130141.7A Active CN112305730B (en) | 2020-10-21 | 2020-10-21 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112305730B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115079388B (en) * | 2022-06-17 | 2023-07-04 | 湖南长步道光学科技有限公司 | Full-frame optical system and movie lens |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7092169B1 (en) * | 2005-04-26 | 2006-08-15 | Asia Optical Co., Inc. | Zoom lens system |
| JP2011164195A (en) * | 2010-02-05 | 2011-08-25 | Sony Corp | Zoom lens and imaging apparatus |
| CN213482553U (en) * | 2020-10-21 | 2021-06-18 | 舜宇光学(中山)有限公司 | Zoom lens |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100514111C (en) * | 2005-05-13 | 2009-07-15 | 亚洲光学股份有限公司 | Zoom lens |
| JP5065150B2 (en) * | 2008-05-16 | 2012-10-31 | 富士フイルム株式会社 | Zoom lens and imaging device |
| JP5333903B2 (en) * | 2008-10-09 | 2013-11-06 | 株式会社ニコン | Zoom lens and optical equipment |
| JP5585425B2 (en) * | 2010-12-07 | 2014-09-10 | ソニー株式会社 | Zoom lens and imaging device |
| JP2013125075A (en) * | 2011-12-13 | 2013-06-24 | Sony Corp | Zoom lens and image pickup apparatus |
| CN106125273B (en) * | 2016-07-19 | 2018-10-16 | 嘉兴中润光学科技有限公司 | A kind of zoom lens |
| CN208477195U (en) * | 2018-07-13 | 2019-02-05 | 嘉兴中润光学科技有限公司 | Minimize the high definition varifocal optical system of big target surface |
| CN110955035A (en) * | 2019-12-23 | 2020-04-03 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN111505814B (en) * | 2020-06-30 | 2020-12-01 | 嘉兴中润光学科技有限公司 | High-resolution image pickup device and high-definition zoom lens |
-
2020
- 2020-10-21 CN CN202011130141.7A patent/CN112305730B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7092169B1 (en) * | 2005-04-26 | 2006-08-15 | Asia Optical Co., Inc. | Zoom lens system |
| JP2011164195A (en) * | 2010-02-05 | 2011-08-25 | Sony Corp | Zoom lens and imaging apparatus |
| CN213482553U (en) * | 2020-10-21 | 2021-06-18 | 舜宇光学(中山)有限公司 | Zoom lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112305730A (en) | 2021-02-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110955035A (en) | Zoom lens | |
| CN111123493A (en) | a zoom lens | |
| CN113589505B (en) | Zoom lens and imaging device | |
| CN112346225B (en) | Zoom lens | |
| CN214225569U (en) | Zoom lens | |
| CN112083561B (en) | Zoom lens | |
| CN111722384A (en) | a zoom lens | |
| CN211014817U (en) | Zoom lens | |
| CN112666689B (en) | Zoom lens | |
| CN112068294B (en) | Zoom lens | |
| CN114895443B (en) | Zoom lens | |
| CN218497250U (en) | Zoom lens | |
| CN112305730B (en) | Zoom lens | |
| CN214311079U (en) | Zoom lens | |
| CN214225566U (en) | Lens barrel | |
| CN110346920B (en) | Fish-eye lens | |
| CN213482553U (en) | Zoom lens | |
| CN111913284A (en) | Large image area wide-angle lens | |
| CN217879799U (en) | Zoom lens | |
| CN218158534U (en) | Zoom lens | |
| CN216927241U (en) | Zoom lens | |
| CN217385962U (en) | Glass-plastic mixed optical system | |
| CN114089519B (en) | Zoom lens | |
| CN214225570U (en) | Optical system | |
| CN114967083A (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 |