CN217543516U - Zoom lens - Google Patents
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- CN217543516U CN217543516U CN202121477971.7U CN202121477971U CN217543516U CN 217543516 U CN217543516 U CN 217543516U CN 202121477971 U CN202121477971 U CN 202121477971U CN 217543516 U CN217543516 U CN 217543516U
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Abstract
The utility model relates to a zoom lens, include along the first fixed crowd (G1), the first crowd (G2), the diaphragm (STO) of zooming, the fixed crowd (G3) of second, focus crowd (G4) and terminal lens crowd (G5) of zooming that the optical axis arranged in proper order from the thing side to image side, terminal lens crowd (G5) is for zooming crowd or fixed crowd, first crowd (G2) of zooming can remove along the optical axis and accomplish zoom lens is from wide angle to the change of telephoto, focus crowd (G4) are used for moving along the optical axis and rectify the removal in image plane that the variation time arouses, the fixed crowd (G3) of second with focus crowd (G4) all have positive focal power. The utility model discloses a zoom lens can be applied to the security protection field, and it possesses high resolution, big image plane, big zoom ratio, infrared confocal and can realize the characteristics of zooming in succession.
Description
Technical Field
The utility model relates to an optical imaging technical field especially relates to a zoom.
Background
With the increase of the network speed, the high-quality and high-resolution images can be rapidly transmitted, and therefore higher requirements such as the resolution and the zoom range of a lens are put forward for the imaging quality of the optical lens in the security field. The monitoring in the prior art generally cannot achieve the compatibility of a large image plane and a small volume, and most of monitoring lenses of the large image plane are fixed-focus lenses, so that the monitoring distance is difficult to control when changed, and the volume is large. In addition, the optical distortion of the existing monitoring lens at different focal length sections is changed greatly, the resolution ratio is low, which is mostly 1080P, and the number of pixel points is 200 ten thousand. Therefore, the monitoring lens in the prior art is not enough to meet the requirements of the artificial intelligence related fields of face recognition, license plate recognition and the like which are gradually popularized at present.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a zoom.
In order to achieve the above object, the present invention provides a zoom lens, including the first fixed crowd, the first crowd, the diaphragm that zooms, the fixed crowd of second, focus crowd and the end lens crowd of zooming that arrange along the optical axis from the object side to the image side in proper order, end lens crowd is for zooming crowd or fixed crowd, the first crowd of zooming can be along the optical axis removal completion zoom lens is from wide angle to the change of telephoto, focus crowd is used for moving along the optical axis and corrects the removal of the image plane that the zoom arouses, the fixed crowd of second with focus crowd all has positive focal power.
According to an aspect of the present invention, the first fixed group has a positive focal power, the first zoom group has a negative focal power, and the end lens group has a positive focal power or a negative focal power.
According to an aspect of the invention, the first fixed group comprises one lens with negative focal power and three lenses with positive focal power.
According to an aspect of the present invention, the first fixed group includes a double cemented lens.
According to an aspect of the present invention, the first zoom group includes three lenses having negative refractive power and one lens having positive refractive power.
According to an aspect of the present invention, the first zoom group includes at least one biconcave lens and one meniscus lens.
According to an aspect of the present invention, the second fixed group includes at least two lenses having positive focal power and three lenses having negative focal power.
According to an aspect of the utility model, the fixed crowd of second includes a piece of aspheric surface lens and a piece of three glued mirror group at least.
According to an aspect of the invention, the fixed group of second includes two pieces of biconvex lens and two pieces of meniscus lens at least.
According to an aspect of the invention, the focus group comprises two lenses with positive optical power and one lens with negative optical power.
According to an aspect of the present invention, the focusing group includes a double cemented lens group.
According to an aspect of the invention, the focus group comprises at least one lenticular lens.
According to an aspect of the present invention, the end lens group includes a lens having a positive refractive power and a lens having a negative refractive power.
According to an aspect of the present invention, the end lens group includes at least one meniscus lens or one biconvex lens.
According to an aspect of the present invention, the first fixed group, the first zoom group, the second fixed group, the focus group and the focal length f1, f2, f3, f4, f5 of the end lens group respectively with the zoom wide-angle end focal length fw satisfies the following relationship: f1/fw is more than or equal to 2 and less than or equal to 4, f2/fw is more than or equal to 1 and less than or equal to 0,1 and less than or equal to f3/fw is more than or equal to 2,1.3 and less than or equal to f4/fw is less than or equal to 1.8, and f5/fw is more than or equal to 20 and less than or equal to 50.
According to an aspect of the utility model, the position of diaphragm satisfies following relational expression:
0.4≤L S-IMG /TTL≤0.55；
wherein L is S-IMG The distance from the diaphragm to the image surface is TTL is the optical total of the zoom lensIs long.
According to an aspect of the present invention, the distance Z1 that the first zoom group moves from the wide-angle end to the telephoto end and the total optical length TTL of the zoom lens satisfy the following relationship: Z1/TTL is more than or equal to 0.15 and less than or equal to 0.35.
According to an aspect of the present invention, the refractive index Nd of the ninth lens from the object side to the image side along the optical axis in the zoom lens L9 And Abbe number Vd L9 The following conditions are respectively satisfied: 1.5<Nd L9 <1.6；50<Vd L9 <90；
Refractive index Nd of ninth lens from object side to image side in zoom lens L9 And refractive index Nd of tenth lens L10 The following relationship is satisfied: nd of 0.03 ≤ L9 -Nd L10 |≤0.12。
According to the utility model discloses a scheme provides a camera lens that can zoom in succession to can be applied to the security protection field. The zoom lens has the characteristics of high resolution, small distortion, large image surface, small volume, large zoom ratio and infrared confocal, and can adapt to the field with larger change of monitoring distance.
According to the utility model discloses a scheme only uses a piece of glass aspheric lens among the zoom to make the sensitivity of camera lens reduce, also make lens wherein easily process, and camera lens equipment yield also greatly increases.
According to the utility model discloses an aspect, zoom can realize the resolution ratio that is higher than 400 ten thousand pixels, to 9.2 mm's 1/1.8 "CMOS, can reach the even effect of central and peripheral 0.7H (70% diagonal position) imaging resolution ratio.
According to the utility model discloses a scheme, through adopting the scheme of aspheric lens and the mutual collocation of glass spherical lens, both can make the aberration of zoom obtain effectual correction, can also make zoom not virtual burnt at-40 deg.C 80 ℃ temperature range.
According to the utility model discloses a scheme, zoom can realize wide-angle end FNO and be less than or equal to 2.0, and the zoom ratio is more than or equal to 30 big zoom scope, not only can be dual-purpose day and night, but also overcome big relative aperture, confocal, little distortion day and night, high low temperature virtual focus and the contradiction between the power of resolving images, increased the use occasion and the environmental condition scope of camera lens to the quality and the competitiveness of camera lens product have been promoted.
Drawings
Fig. 1 is a schematic view showing a configuration of a zoom lens according to a first embodiment of the present invention;
fig. 2 schematically shows an MTF chart at a wide-angle end of 850nm infrared at a normal temperature of 20 degrees and at night in the zoom lens according to the first embodiment of the present invention;
fig. 3 is a Through-Focus-MTF diagram schematically illustrating a wide-angle end at 20 degrees at normal temperature under visible light according to a first embodiment of the present invention;
fig. 4 is a schematic view showing a configuration of a zoom lens according to a second embodiment of the present invention;
fig. 5 is a MTF chart of a zoom lens according to a second embodiment of the present invention at a wide-angle end of 850nm infrared light at a normal temperature of 20 degrees at night;
fig. 6 schematically shows a wide-angle end Through-Focus-MTF diagram at a normal temperature of 20 degrees and under visible light in the zoom lens according to the second embodiment of the present invention;
fig. 7 is a schematic view showing a configuration of a zoom lens according to a third embodiment of the present invention;
fig. 8 is a MTF chart of a zoom lens according to a third embodiment of the present invention at a wide angle end of 850nm infrared at a normal temperature of 20 degrees at night;
fig. 9 schematically shows a wide-angle end Through-Focus-MTF diagram at a normal temperature of 20 degrees and under visible light in the zoom lens according to the third embodiment of the present invention;
fig. 10 is a schematic diagram illustrating a configuration of a zoom lens according to a fourth embodiment of the present invention;
fig. 11 is a MTF chart of a zoom lens according to a fourth embodiment of the present invention schematically illustrating a wide angle end of 850nm at room temperature and 20 degrees in nighttime;
fig. 12 is a Through-Focus-MTF diagram schematically illustrating a wide-angle end at 20 degrees at normal temperature under visible light in a zoom lens according to a fourth embodiment of the present invention;
fig. 13 is a schematic view showing a configuration of a zoom lens according to a fifth embodiment of the present invention;
fig. 14 is a MTF chart of a zoom lens according to a fifth embodiment of the present invention schematically illustrating a normal temperature 20 degrees at a wide angle of infrared 850nm at night;
fig. 15 is a schematic view showing a wide-angle end Through-Focus-MTF diagram at a normal temperature of 20 degrees and under visible light in a zoom lens according to a fifth embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer" are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings for ease of description and simplicity of description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the invention.
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not described herein in detail, but the present invention is not limited to the following embodiments.
Referring to fig. 1, the present invention provides a large aperture, large image plane, large magnification zoom lens, which comprises a first fixed group G1, a first zoom group G2, a stop STO, a second fixed group G3, a focusing group G4, and a terminal lens group G5 arranged in sequence from an object side to an image side along an optical axis, and further comprises a protective glass CG located at the image side of the terminal lens group G5. The end lens group G5 is a zoom group or a fixed group, the first zoom group G2 can move along the optical axis to change the zoom lens from wide to telephoto, and the focus group G4 is used to move along the optical axis to correct the movement of the image plane caused by zooming. The utility model discloses in, the fixed crowd G3 of second and focus crowd G4 all have positive focal power, make the utility model discloses can realize big zoom ratio and big light ring, and tolerance sensitivity is lower.
The utility model discloses in, first fixed crowd G1 has positive focal power, and first crowd G2 that zooms has negative focal power, and end lens crowd G5 has positive focal power or negative focal power. The first fixed group G1 includes one lens having a negative refractive power and three lenses having a positive refractive power. The first fixing group G1 includes a double cemented lens set. The first fixed group G1 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged in order from the object side to the image side along the optical axis.
The utility model discloses in, first group G2 that zooms includes three pieces of lens that have negative focal power and one piece of lens that have positive focal power. The first zoom group G2 includes at least a biconcave lens and a meniscus lens. The first zoom group G2 includes a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8, which are arranged in order from the object side to the image side along the optical axis.
The utility model discloses in, the fixed crowd G3 of second includes two pieces of lens that have positive focal power and three pieces of lens that have negative focal power at least. The second fixed group G3 at least includes an aspherical lens and a cemented lens group. The second fixed group G3 includes at least two biconvex lenses and two meniscus lenses. In the present invention, the second fixed group G3 includes five or six lenses, i.e., a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, and a thirteenth lens L13, or a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, and a fourteenth lens L14, which are arranged in order from the object side to the image side along the optical axis.
The utility model discloses in, focus group G4 includes two pieces of lens that have positive focal power and one piece of lens that have negative focal power. The focusing group G4 includes a double lens assembly. The focusing group G4 includes at least one lenticular lens. The focus group G4 includes three lenses, i.e., a fourteenth lens 14, a fifteenth lens L15, and a sixteenth lens L16, or a fifteenth lens L15, a sixteenth lens L16, and a seventeenth lens L17, arranged in order from the object side to the image side along the optical axis.
In the present invention, the end lens group G5 includes a lens with positive focal power and a lens with negative focal power. The end lens group G5 includes at least one meniscus lens or one biconvex lens. The end lens group G5 has two lenses, i.e., a seventeenth lens L17 and an eighteenth lens L18, or an eighteenth lens L18 and a nineteenth lens L19, arranged in order from the object side to the image side along the optical axis.
The utility model discloses in, first fixed crowd G1, first crowd G2, the fixed crowd G3 of second, focus crowd G4 and end lens crowd G5's focus f1, f2, f3, f4, f5 satisfy following relation with zoom wide-angle end focus fw respectively: f1/fw is more than or equal to 2 and less than or equal to 4, f2/fw is more than or equal to 1 and less than or equal to 0,1 and less than or equal to f3/fw is more than or equal to 2,1.3 and less than or equal to f4/fw is less than or equal to 1.8, and f5/fw is more than or equal to 20 and less than or equal to 50.
The utility model discloses in, the position of diaphragm STO satisfies following relational expression:
0.4≤L S-IMG /TTL≤0.55；
wherein L is S-IMG TTL is the total optical length of the zoom lens, i.e. the distance from the central vertex of the front surface of the first lens L1 to the image plane.
The utility model discloses in, the distance Z1 that first zoom crowd G2 removed from wide-angle end to telephoto end satisfies following relation with the optics total length TTL of zoom: Z1/TTL is more than or equal to 0.15 and less than or equal to 0.35. Satisfying the above formula can reduce the possibility of the imaging device being too bulky.
In the present invention, the refractive index Nd of the ninth lens (i.e. the ninth lens L9) from the object side to the image side along the optical axis in the zoom lens L9 And Abbe number Vd L9 The following conditions are respectively satisfied: 1.5<Nd L9 <1.6；50<Vd L9 <90. Refractive index Nd of ninth lens from object side to image side in zoom lens L9 And refractive index Nd of tenth lens (i.e., tenth lens L10) L10 The following relationship is satisfied: nd of 0.03 ≤ L9 -Nd L10 |≤0.12。
To sum up, the utility model discloses a zoom has only used one piece of glass aspheric lens for the sensitivity of camera lens obtains reducing, also makes lens easily process, and the camera lens equipment yield greatly increases. The utility model discloses a zoom can realize being higher than 400 ten thousand pixel's resolution ratio to 9.2 mm's 1/1.8 "CMOS is for example, and the camera lens can reach the even effect of central and peripheral 0.7H (70% diagonal position) imaging resolution ratio. In addition, by adopting the scheme of mutually matching the aspheric lens and the glass spherical lens, the aberration of the zoom lens can be effectively corrected, and the zoom lens can not be in virtual focus within the temperature range of-40 ℃ to 80 ℃. Moreover, the zoom lens can realize a large zooming range with FNO (zoom ratio) not more than 2.0 at the wide-angle end and zoom ratio not less than 30, can be used for both day and night, overcomes the contradiction between large relative aperture, day and night confocal, small distortion, high and low temperature virtual focus and image resolving power, and increases the using occasions and environmental condition range of the lens, thereby improving the quality and competitiveness of lens products.
The zoom lens of the present invention will be specifically described below in the five-group embodiment. In the following embodiments, the surfaces of the lenses and the protective glass CG are denoted by S1, S2, …, SN, the object surface is denoted by OBJ, the STOP STO is denoted by STOP, the image surface is denoted by IMA, and the bonding surface of the bonding lens group is denoted by one surface. The aspherical lens satisfies the following formula:
wherein z is the axial distance from the curved surface to the peak at the position which is along the direction of the optical axis and is vertical to the optical axis by the height h; c represents 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 Respectively representing the aspheric coefficients of fourth order, sixth order, eighth order, tenth order and twelfth order.
The parameters of each embodiment specifically satisfying the above conditional expressions are shown in table 1 below:
TABLE 1
First embodiment
Referring to fig. 1, in the present embodiment, the second fixed group G3 has five lenses, and the end lens group G5 is a zoom group having negative optical power.
Relevant parameters of the lens of the zoom lens of the present embodiment include surface type, radius of curvature, thickness, refractive index of the material, abbe number, as shown in table 2 below:
TABLE 2
The aspherical surface coefficients of the aspherical lenses in this embodiment are shown in table 3 below:
TABLE 3
K is a conic constant of the surface, and A, B, C, D, E are aspheric coefficients of second order, fourth order, sixth order, eighth order and tenth order, respectively.
The distances of the lens groups at the wide-angle end and the telephoto end of the zoom lens are shown in the following table 4:
| thickness of | Wide angle end | The telescope end |
| D1 | 1.422 | 40.667 |
| D2 | 39.446 | 0.201 |
| D3 | 6.946 | 3.045 |
| D4 | 10.486 | 0.100 |
| D5 | 0.645 | 14.932 |
TABLE 4
Wherein D1 represents a distance from the image side of the first fixed group G1 to the object of the first zoom group G2, D2 represents a distance from the image side of the first zoom group G2 to the stop, D3 represents a distance from the image side of the second fixed group G3 to the object of the focus group G4, D4 represents a distance from the image side of the focus group G4 to the object of the end lens group G5, and D5 represents a distance from the image side of the end lens group G5 to the object of 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 and 3, the zoom lens of the present embodiment achieves a large zoom ratio and a large image plane, corrects chromatic aberration of 430 to 850nm, achieves confocal at the wide-angle end, ensures that the lens does not have virtual focus at the wide-angle end of-40 to 70 ℃, and enlarges the applicable scenes of the lens.
Second embodiment
Referring to fig. 4, in the present embodiment, the second fixed group G3 has five lenses, and the end lens group G5 is a fixed group having positive refractive power.
Relevant parameters of the lens of the zoom lens of the present embodiment include surface type, radius of curvature, thickness, refractive index of the material, abbe number, as shown in table 5 below:
TABLE 5
The aspherical coefficients of the aspherical lenses in the present embodiment are shown in table 6 below:
| noodle sequence number | K | A | B | C | D | E |
| S18 | 0.000 | 0.00E+00 | 7.04E-06 | 8.78E-09 | 1.99E-12 | 2.70E-14 |
| S19 | 0.000 | 0.00E+00 | 7.36E-06 | -1.77E-09 | -1.09E-11 | -1.76E-14 |
TABLE 6
K is a conic constant of the surface, and A, B, C, D, E are aspheric coefficients of second order, fourth order, sixth order, eighth order and tenth order, respectively.
The distances of the respective lens groups at the wide-angle end and the telephoto end of the zoom lens are as shown in the following table 7:
| thickness of | Wide angle end | Telescope end |
| D1 | 1.697 | 41.326 |
| D2 | 39.729 | 0.100 |
| D3 | 5.979 | 12.714 |
| D4 | 8.114 | 1.379 |
TABLE 7
Wherein D1 represents a distance from the image side of the first fixed group G1 to the object side of the first zoom group G2, D2 represents a distance from the image side of the first zoom group G2 to the object side of the stop, D3 represents a distance from the image side of the stop to the object side of the second fixed group G3, and D4 represents a distance from the image side of the second fixed group G3 to the object side of the focus group G4. Wherein D1, D2, D3, D4 are different depending on the wide angle end and the telephoto end.
As can be seen from fig. 5 and 6, the zoom lens of the present embodiment achieves a large zoom ratio and a large image plane, corrects chromatic aberration of 430 to 850nm, achieves confocal at the wide-angle end of day and night, ensures that the lens does not have virtual focus at the wide-angle end of-40 to 70 ℃, and enlarges the applicable scenes of the lens.
Third embodiment
Referring to fig. 7, in the present embodiment, the second fixed group G3 has six lenses, and the end lens group G5 is a zoom group having negative optical power.
Relevant parameters of the lens of the zoom lens of the present embodiment include surface type, radius of curvature, thickness, refractive index of the material, abbe number, as shown in table 8 below:
TABLE 8
The aspherical coefficients of the aspherical lenses in this embodiment are shown in table 9 below:
| noodle sequence number | K | A | B | C | D | E |
| S18 | -1.097 | 0.00E+00 | 7.79E-06 | 1.38E-08 | 1.25E-10 | 5.06E-14 |
| S19 | 0.000 | 0.00E+00 | 7.17E-06 | 8.35E-08 | 2.42E-10 | -2.18E-14 |
TABLE 9
K is a conic constant of the surface, and A, B, C, D, E are aspheric coefficients of second order, fourth order, sixth order, eighth order and tenth order, respectively.
The distances of the respective lens groups at the wide-angle end and the telephoto end of the zoom lens are shown in the following table 10:
| thickness of | Wide angle end | Telescope end |
| D1 | 11.890 | 40.096 |
| D2 | 31.803 | 3.597 |
| D3 | 5.707 | 2.466 |
| D4 | 10.186 | 0.778 |
| D5 | 0.124 | 12.773 |
TABLE 10
Wherein D1 represents a distance from the image side of the first fixed group G1 to the object side of the first zoom group G2, D2 represents a distance from the image side of the first zoom group G2 to the object side of the stop, D3 represents a distance from the image side of the stop to the object side of the second fixed group G3, D4 represents a distance from the image side of the second fixed group G3 to the object side of the focus group G4, and D5 represents a distance from the image side of the focus group G4 to the object side of the end lens group G5. Wherein D1, D2, D3, D4, D5 are different depending on the wide angle end and the telephoto end.
As can be seen from fig. 8 and 9, the zoom lens of the present embodiment achieves a large zoom ratio and a large image plane, corrects chromatic aberration of 430 to 850nm, achieves confocal at the wide-angle end of day and night, ensures that the lens does not have virtual focus at the wide-angle end of-40 to 70 ℃, and enlarges the applicable scenes of the lens.
Fourth embodiment
Referring to fig. 10, in the present embodiment, the second fixed group G3 has five lenses, and the end lens group G5 is a fixed group having negative refractive power.
Relevant parameters of the lens of the zoom lens of the present embodiment include surface type, radius of curvature, thickness, refractive index of the material, abbe number, as shown in table 11 below:
TABLE 11
The aspherical coefficients of the aspherical lenses in this embodiment are shown in table 12 below:
| number of noodles | K | A | B | C | D | E |
| S17 | -1.219 | 0.00E+00 | 9.05E-06 | 2.23E-08 | 3.29E-11 | 1.64E-13 |
| S18 | 0.000 | 0.00E+00 | 1.01E-05 | -6.01E-09 | -4.58E-11 | -3.49E-13 |
TABLE 12
Where K is the conic constant of the surface, and A, B, C, D, E are second, fourth, sixth, eighth and tenth order aspheric coefficients, respectively.
The distances of the respective lens groups at the wide angle end and the telephoto end of the zoom lens are as shown in table 13 below:
| thickness of | Wide angle end | Telescope end |
| D1 | 4.468 | 41.389 |
| D2 | 38.336 | 1.415 |
| D3 | 1.985 | 11.338 |
| D4 | 10.599 | 1.246 |
Watch 13
Wherein D1 represents a distance from the image side of the first fixed group G1 to the object side of the first zoom group G2, D2 represents a distance from the image side of the first zoom group G2 to the object side of the stop, D3 represents a distance from the image side of the stop to the object side of the second fixed group G3, and D4 represents a distance from the image side of the second fixed group G3 to the object side of the focus group G4. Wherein D1, D2, D3, D4 are different depending on the wide angle end and the telephoto end.
As can be seen from fig. 11 and 12, the zoom lens of the present embodiment achieves a large zoom ratio, a large image plane, a corrected chromatic aberration of 430 to 850nm, a confocal day and night at the wide-angle end, ensures that the lens is not virtually focused at the wide-angle end of-40 to 70 ℃, and enlarges the applicable scenes of the lens.
Fifth embodiment
Referring to fig. 13, in the present embodiment, the second fixed group G3 has six lenses, and the end lens group G5 is a zoom group having negative optical power.
Relevant parameters of the lens of the zoom lens of the present embodiment include surface type, radius of curvature, thickness, refractive index of the material, abbe number, as shown in table 14 below:
TABLE 14
The aspherical coefficients of the aspherical lenses in the present embodiment are shown in table 15 below:
| number of noodles | K | A | B | C | D | E |
| S18 | -1.120 | 0.00E+00 | 7.66E-06 | 2.94E-08 | 2.54E-11 | -4.57E-13 |
| S19 | 0.000 | 0.00E+00 | 8.15E-06 | -9.05E-09 | -6.33E-11 | -2.39E-13 |
Watch 15
K is a conic constant of the surface, and A, B, C, D, E are aspheric coefficients of second order, fourth order, sixth order, eighth order and tenth order, respectively.
The distances of the respective lens groups at the wide angle end and the telephoto end of the zoom lens are shown in the following table 16:
| thickness of | Wide angle end | Telescope end |
| D1 | 4.762 | 40.637 |
| D2 | 39.122 | 3.247 |
| D3 | 3.477 | 3.141 |
| D4 | 10.923 | 0.336 |
| D5 | 4.112 | 15.035 |
TABLE 16
Wherein D1 represents a distance from the image side of the first fixed group G1 to the object of the first zoom group G2, D2 represents a distance from the image side of the first zoom group G2 to the object of the stop, D3 represents a distance from the image side of the stop to the object of the second fixed group G3, D4 represents a distance from the image side of the second fixed group G3 to the object of the focus group G4, and D5 represents a distance from the image side of the focus group G4 to the object of the end lens group G5. Wherein D1, D2, D3, D4, D5 are different depending on the wide angle end and the telephoto end.
As can be seen from fig. 14 and 15, the zoom lens of the present embodiment achieves a large zoom ratio, a large image plane, corrects chromatic aberration of 430 to 850nm, achieves confocal at the wide-angle end, ensures that the lens does not have virtual focus at the wide-angle end of-40 to 70 ℃, and enlarges the applicable scenes of the lens.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (18)
1. A zoom lens comprises a first fixed group (G1), a first zoom group (G2), a diaphragm (STO), a second fixed group (G3), a focus group (G4) and a terminal lens group (G5) which are arranged in sequence from an object side to an image side along an optical axis, wherein the terminal lens group (G5) is a zoom group or a fixed group, the first zoom group (G2) can move along the optical axis to complete the change of the zoom lens from a wide angle to a long focus, and the focus group (G4) is used for moving along the optical axis to correct the movement of an image plane caused by zooming, and is characterized in that the second fixed group (G3) and the focus group (G4) both have positive focal power.
2. A zoom lens according to claim 1, characterized in that the first fixed group (G1) has a positive optical power, the first zoom group (G2) has a negative optical power, and the end lens group (G5) has either a positive or a negative optical power.
3. A zoom lens according to claim 1, wherein the first fixed group (G1) comprises one lens having negative optical power and three lenses having positive optical power.
4. A zoom lens according to claim 1, wherein the first fixed group (G1) comprises a double cemented lens group.
5. A zoom lens according to claim 1, wherein the first zoom group (G2) comprises three lenses having negative optical power and one lens having positive optical power.
6. A zoom lens according to claim 1, wherein the first zoom group (G2) comprises at least a biconcave lens and a meniscus lens.
7. The zoom lens according to claim 1, wherein the second fixed group (G3) includes at least two lenses having positive optical power and three lenses having negative optical power.
8. A zoom lens according to claim 1, wherein the second fixed group (G3) comprises at least one aspherical lens and one triplex cemented lens group.
9. A zoom lens according to claim 1, characterized in that the second fixed group (G3) comprises at least two biconvex lenses and two meniscus lenses.
10. A zoom lens according to claim 1, wherein the focus group (G4) comprises two lenses having positive optical power and one lens having negative optical power.
11. A zoom lens according to claim 1, wherein the focusing group (G4) comprises a double cemented lens set.
12. A zoom lens according to claim 1, wherein the focusing group (G4) comprises at least one biconvex lens.
13. The zoom lens according to claim 1, wherein the end lens group (G5) includes a lens having positive optical power and a lens having negative optical power.
14. The zoom lens according to claim 1, wherein the end lens group (G5) comprises at least one meniscus lens or one biconvex lens.
15. A zoom lens according to any one of claims 1-14, wherein focal lengths f1, f2, f3, f4, f5 of the first fixed group (G1), the first zoom group (G2), the second fixed group (G3), the focusing group (G4) and the end lens group (G5) satisfy the following relationships, respectively, with the zoom wide-angle end focal length fw: f1/fw is more than or equal to 2 and less than or equal to 4, f2/fw is more than or equal to 1 and less than or equal to 0,1 and less than or equal to f3/fw is more than or equal to 2,1.3 and less than or equal to f4/fw and less than or equal to 1.8, and f5/fw is more than or equal to 20 and less than or equal to 50.
16. A zoom lens according to any one of claims 1 to 14, wherein the position of the Stop (STO) satisfies the following relation:
0.4≤L S-IMG /TTL≤0.55；
wherein L is S-IMG And the distance from the diaphragm (STO) to the image plane, and the TTL is the optical total length of the zoom lens.
17. A zoom lens according to any one of claims 1-14, wherein a distance Z1 over which the first zoom group (G2) moves from a wide angle end to a telephoto end and a total optical length TTL of the zoom lens satisfy the following relationship: Z1/TTL is more than or equal to 0.15 and less than or equal to 0.35.
18. The zoom lens according to any one of claims 1 to 14, wherein a refractive index Nd of a ninth lens from the object side to the image side in the zoom lens L9 And Abbe number Vd L9 The following conditions are respectively satisfied: 1.5<Nd L9 <1.6；50<Vd L9 <90；
Refractive index Nd of ninth lens from object side to image side in zoom lens L9 And refractive index Nd of tenth lens L10 The following relationship is satisfied: nd of 0.03 ≤ L9 -Nd L10 |≤0.12。
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| CN202121477971.7U CN217543516U (en) | 2021-07-01 | 2021-07-01 | Zoom lens |
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| CN202121477971.7U CN217543516U (en) | 2021-07-01 | 2021-07-01 | Zoom lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113534422A (en) * | 2021-07-01 | 2021-10-22 | 舜宇光学(中山)有限公司 | Zoom lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113534422A (en) * | 2021-07-01 | 2021-10-22 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN113534422B (en) * | 2021-07-01 | 2024-08-23 | 舜宇光学(中山)有限公司 | Zoom lens |
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