CN208888463U - A kind of zoom lens - Google Patents
A kind of zoom lens Download PDFInfo
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- CN208888463U CN208888463U CN201821657557.2U CN201821657557U CN208888463U CN 208888463 U CN208888463 U CN 208888463U CN 201821657557 U CN201821657557 U CN 201821657557U CN 208888463 U CN208888463 U CN 208888463U
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Abstract
The utility model relates to a kind of zoom lens, the first lens group with positive light coke including being arranged successively along optical axis from object side to image side, the second lens group with negative power, the third lens group with positive light coke and the 4th lens groups with positive light coke；When zooming, second lens group and the 4th lens group are linearly moved back and forth along the optical axis；Along optical axis from object side to image side, the first lens in first lens group are set as negative-power lenses, and the first lens in second lens group are set as negative-power lenses.Its FNO reaches starlight grade, image space F number reaches 1.0~1.4, camera lens is set to obtain sufficient light-inletting quantity, the signal-to-noise ratio reduced in the case where illumination abundance, to obtain clearly image, and the zoom lens of the utility model in zooming procedure f-number close to constant, it is ensured that picture brightness does not change with focal length and is changed in zooming procedure.
Description
Technical field
The utility model relates to optical image technology field more particularly to a kind of zoom lens.
Background technique
In protection and monitor field, small size zoom lens is applied very extensive since its focal length is variable.Specifically,
In protection and monitor field, zoom lens, which generally requires, has following characteristic: 1. different monitoring places need different field angles (burnt
Away from) camera lens, improve the field angle of camera lens to expand monitoring range；2. security lens should remain in the low light environments such as night vision
Meet requirement；3. security lens should also have big zoom rate, being adapted to the round-the-clock monitoring such as daytime, night at dusk is needed
It asks.4. reasonable Design of Temperature Compensation, guarantee camera lens under high temperature or low temperature environment, camera lens do not need to focus again it is ensured that
Resolution ratio identical with room temperature.
In recent years, as the development of the chip technologies such as CCD or CMOS and people mention monitoring image quality requirement
Height requires the image quality of the optical system to match also higher and higher.In order to meet the trend, for being mounted in security protection prison
Control optical lens also the further requirement high-resolution, big multiplying power, day and night performances such as confocal etc. on product.
Currently, front-end camera is usually divided into four grades: ordinary camera, general illumination in protection and monitor field
Value is all larger than 0.1lux；Brightness value range is imaged in 0.1lux to the video camera between 0.01lux, commonly referred to as low-light (level)
Machine；And brightness value range in 0.01lux between 0.001lux, referred to as the moon lighting level video camera；When minimal illumination value reaches even
The ultra low illumination camera of " starlight grade " when lower than 0.0001lux, is just reached.Without any fill-in light under starlight environment
Source can show clearly color image, be different from common camera and be only able to display black white image.Existing large aperture varifocal mirror
Head is difficult to realize visible light simultaneously and the performances such as infrared band is confocal, temperature drift is small, zoom ratio is big, leads to existing security protection
Camera lens is difficult to be provided simultaneously with above-mentioned all characteristics, and general large aperture zoom lens is to realize high-resolution, needs to use
Glass aspheric eyeglass, greatly increases cost.
Utility model content
One of the utility model is designed to provide a kind of zoom lens, being capable of blur-free imaging under low-light (level) environment.
To achieve the above object, the utility model provides a kind of zoom lens, including along optical axis from object side to image side successively
The first lens group with positive light coke, the second lens group with negative power, the third with positive light coke of arrangement are saturating
Microscope group and the 4th lens group with positive light coke；
When zooming, second lens group and the 4th lens group are linearly moved back and forth along the optical axis；
Along optical axis from object side to image side, the first lens in first lens group are set as negative-power lenses, institute
The first lens stated in the second lens group are set as negative-power lenses.
One aspect according to the present utility model, first lens group include at least one piece of negative-power lenses and two pieces
Positive power lens；
Second lens group includes at least two pieces of negative-power lenses and one piece of positive optic angle power lenses；
The third lens group includes at least one piece of three balsaming lens, one piece of cemented doublet and one piece of meniscus lens；
4th lens group includes at least one piece of cemented doublet.
One aspect according to the present utility model further includes diaphragm, and the diaphragm is set to second lens group and institute
It states between the third lens group.
One aspect according to the present utility model, along optical axis from object side to image side, first lens group the last one thoroughly
Maximum distance between the image side surface of mirror and the object side of the second lens group first lens is d12t, and minimum range is
D12w, between the image side surface of the last one lens of first lens group and the object side of the second lens group first lens
When for minimum range d12w, the first focal length of the zoom lens is fw, then the maximum distance d12t, minimum range d12w and
The first focal length fw meets: 1.5≤(d12t-d12w)/fw≤4.
One aspect according to the present utility model, the image side surface of the last one lens of first lens group and described second
When being minimum range d12w between the object side of lens group first lens, the first focal length of the zoom lens is fw, described
Second lens group focal length of the second lens group is f2, is met between the first focal length fw and the second lens group focal length f2: 1
≤|f2|/fw≤3。
One aspect according to the present utility model, the image side surface of the last one lens of first lens group and described second
When being minimum range d12w between the object side of lens group first lens, the first focal length of the zoom lens is fw, described
The third lens group focal length of the third lens group is f3, is met between the first focal length fw and the third lens group focal length f3: 1
≤f3/fw≤5。
One aspect according to the present utility model, along optical axis from object side to image side, first of first lens group is just
First Abbe number of power lenses is v1z1, and the second Abbe number of negative-power lenses is v1f in first lens group, then
The first Abbe number v1z1 and the second Abbe number v1f meets: 30≤| v1z1-v1f |≤70.
One aspect according to the present utility model, the refractive index of at least one piece lens is greater than or waits in second lens group
In 1.7.
One aspect according to the present utility model, include at least in three balsaming lens in the third lens group 1 piece it is low
Dispersion sub-lens, and its Abbe number meets 70≤VD≤100, refractive index meets 1.4≤ND≤1.55.
One aspect according to the present utility model, along optical axis from object side to image side, first of the 4th lens group is thoroughly
Mirror is single lens, and object side is convex surface, and image side surface is concave surface；
Along optical axis from object side to image side, the Abbe number of the first lens of the 4th lens group meets: 40≤vd41≤
65, and its refractive index meets: 1.6≤nd41≤1.75.
One aspect according to the present utility model, it is double glued in the 4th lens group along optical axis from object side to image side
The Abbe v4b2 of the Abbe number v4b1 of first sub-lens of lens and second sub-lens meets: | v4b1-v4b2 | >=
30。
A scheme according to the present utility model, FNO reach starlight grade, and image space F number reaches 1.0~1.4, enables camera lens
Signal-to-noise ratio that is enough to obtain sufficient light-inletting quantity, being reduced in the case where illumination abundance, to obtain clearly image, and this is practical
Novel zoom lens in zooming procedure f-number close to constant, it is ensured that in zooming procedure picture brightness do not change with focal length and
Variation.Meanwhile lens optical design solves temperature drift problems, is not required to focus again within the temperature range of -40 DEG C -80 DEG C
It can guarantee blur-free imaging.In addition, the zoom lens of the utility model realizes that full multiplying power infrared light is confocal, resolution ratio reach 4K with
On, there is excellent resolving power.
A scheme according to the present utility model, imaging performance is excellent, while guaranteeing excellent imaging performance, price
It will not be higher by too much compared with mainstream security protection tight shot, the zoom lens of the utility model uses the scheme of full glass spheric glass,
Reasonable abnormal distribution dispersive glass and glass of high refractive index, reach the imaging effect of high quality, and realize that full multiplying power is infrared total
It is burnt.Meanwhile the rear burnt drift that temperature change is brought is substantially eliminated, make variation of ambient temperature of the camera lens at -40 DEG C to 80 DEG C
Under, resolution ratio identical with room temperature can be guaranteed by being not required to focus again.Not only it ensure that the excellent imaging performance of camera lens, but also reduced
Eyeglass cost has very high cost performance.
Detailed description of the invention
Fig. 1 is the structure chart for schematically showing the zoom lens wide-angle side according to the utility model embodiment 1；
Fig. 2 is the structure chart for schematically showing the zoom lens telescope end according to the utility model embodiment 1；
Fig. 3 is the zoom lens wide angle end position chromaticity difference diagram schematically shown according to the utility model embodiment 1；
Fig. 4 is the zoom lens wide-angle side magnification chromatic aberration diagram schematically shown according to the utility model embodiment 1；
Fig. 5 is the zoom lens wide-angle side distortion figure schematically shown according to the utility model embodiment 1；
Fig. 6 is the zoom lens telescope end chromatism of position figure schematically shown according to the utility model embodiment 1；
Fig. 7 is the zoom lens telescope end magnification chromatic aberration diagram schematically shown according to the utility model embodiment 1；
Fig. 8 is the zoom lens telescope end distortion figure schematically shown according to the utility model embodiment 1；
Fig. 9 is the structure chart for schematically showing the zoom lens wide-angle side according to the utility model embodiment 2；
Figure 10 is the structure chart for schematically showing the zoom lens telescope end according to the utility model embodiment 2；
Figure 11 is the zoom lens wide angle end position chromaticity difference diagram schematically shown according to the utility model embodiment 2；
Figure 12 is the zoom lens wide-angle side magnification chromatic aberration diagram schematically shown according to the utility model embodiment 2；
Figure 13 is the zoom lens wide-angle side distortion figure schematically shown according to the utility model embodiment 2；
Figure 14 is the zoom lens telescope end chromatism of position figure schematically shown according to the utility model embodiment 2；
Figure 15 is the zoom lens telescope end magnification chromatic aberration diagram schematically shown according to the utility model embodiment 2；
Figure 16 is the zoom lens telescope end distortion figure schematically shown according to the utility model embodiment 2；
Figure 17 is the structure chart for schematically showing the zoom lens wide-angle side according to the utility model embodiment 3；
Figure 18 is the structure chart for schematically showing the zoom lens telescope end according to the utility model embodiment 3；
Figure 19 is the zoom lens wide angle end position chromaticity difference diagram schematically shown according to the utility model embodiment 3；
Figure 20 is the zoom lens wide-angle side magnification chromatic aberration diagram schematically shown according to the utility model embodiment 3；
Figure 21 is the zoom lens wide-angle side distortion figure schematically shown according to the utility model embodiment 3；
Figure 22 is the zoom lens telescope end chromatism of position figure schematically shown according to the utility model embodiment 3；
Figure 23 is the zoom lens telescope end magnification chromatic aberration diagram schematically shown according to the utility model embodiment 3；
Figure 24 is the zoom lens telescope end distortion figure schematically shown according to the utility model embodiment 3.
Specific embodiment
It, below will be to implementation in order to illustrate more clearly of the utility model embodiment or technical solution in the prior art
Attached drawing needed in mode is briefly described.It should be evident that the accompanying drawings in the following description is only that this is practical new
Some embodiments of type for those of ordinary skills without creative efforts, can be with
It obtains other drawings based on these drawings.
When being described for the embodiments of the present invention, term " longitudinal direction ", " transverse direction ", "upper", "lower",
"front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", orientation or positional relationship is expressed by "outside"
Based on orientation or positional relationship shown in relevant drawings, it is merely for convenience of describing the present invention and simplifying the description, without
It is that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore on
Stating term should not be understood as limiting the present invention.
The utility model is described in detail with reference to the accompanying drawings and detailed description, embodiment cannot herein one
One repeats, but therefore the embodiments of the present invention is not defined in following implementation.
Referring to figs. 1 and 2, a kind of embodiment according to the present utility model, the zoom lens packet of the utility model
Include the first lens group 1, the second lens group 2, the third lens group 3 and the 4th lens group 4.In the present embodiment, along optical axis from
Object side to image side direction, successively sequence arrangement is set for the first lens group 1, the second lens group 2, the third lens group 3 and the 4th lens group 4
It sets, i.e., ambient transmits successively after the first lens group 1, the second lens group 2, the third lens group 3 and the 4th lens group 4
Blur-free imaging is carried out on to sensor.In the present embodiment, the first lens group 1 be the lens group with positive light coke, second
Lens group 2 is the lens group with negative power, and the third lens group 3 is the lens group with positive light coke, and the 4th lens group 4 is
Lens group with positive light coke.
Referring to figs. 1 and 2, a kind of embodiment according to the present utility model, the second lens group 2 are zoom microscope group,
4th lens group 4 is correction microscope group.In the present embodiment, the second lens group 2 the first lens group 1 and the third lens group 3 it
Between moved along optical axis reciprocating linear, the variation of the focal length of the zoom lens of the utility model can be realized.In the present embodiment,
4th lens group 4 equally can linearly be moved back and forth along optical axis.It is linear along optical axis by the second lens group 2 by above-mentioned setting
The focal length variations for realizing the zoom lens of the utility model are moved back and forth, meanwhile, it is linearly past along optical axis by the 4th lens group 4
The multiple mobile corrective action realized to zooming procedure middle line face change in location, it is real by the second lens group 2 and the 4th lens group 4
Showed the utility model in zooming procedure image quality it is clear, reduce the offset of image planes in zooming procedure, to improve this
The imaging resolution of utility model is advantageous.In the present embodiment, the second lens group 2 is moved along the direction of optical axis from the object side to image side
Dynamic, the zoom lens that the utility model can be realized (is i.e. spaced most from wide-angle side between the second lens group 2 and the first lens group 1
Small position) to the zoom of telescope end (being spaced the smallest position between the second lens group 2 and the third lens group 2).In this reality
It applies in mode, the zoom lens of the utility model is from wide-angle side to the variation of the multiplying power of telescope end zoom up to 3-10 times.
Referring to figs. 1 and 2, the direction along optical axis from object side to image side, the first lens in the first lens group 1 are set
Negative-power lenses are set to, the first lens in the second lens group 2 are set as negative-power lenses.In the present embodiment,
First lens group 1 includes at least one piece of negative-power lenses and two pieces of positive power lens.Second lens group 2 includes at least two pieces
Negative-power lenses and one piece of positive optic angle power lenses.It (includes three that the third lens group 3, which includes at least one piece of three balsaming lens,
The balsaming lens of sub-lens), one piece of cemented doublet (including the balsaming lens of two sub-lens) and one piece of meniscus lens.
4th lens group 4 includes at least one piece of cemented doublet (including the balsaming lens of two sub-lens).
According to the utility model, the first lens in the first lens group 1 are set as negative-power lenses, the second lens group 2
In first lens be set as negative-power lenses, be conducive to the correction of the aberration of the zoom lens of the utility model.First
One piece of negative-power lenses and two pieces of positive power lens are included at least in lens group 1, this lens set-up mode is conducive to together
The zoom lens of Shi Jiaozheng the utility model in the color difference of wide-angle side and telescope end, realizes the zoom lens of the utility model respectively
In the reasonable balance of zoom whole process color difference.Second lens group 2 includes at least two pieces of negative-power lenses and one piece of positive light coke is saturating
Mirror, this lens set-up mode advantageously reduce the zoom lens of the utility model in the field that the big incidence angle light of wide-angle side generates
Bent and dispersion, improves the resolving power of the zoom lens of the utility model.The third lens group 3 include at least one piece of three balsaming lens,
One piece of cemented doublet and one piece of meniscus lens, this lens set-up mode advantageously reduce the sensibility of system tolerance.The
Four lens groups 4 include at least one piece of cemented doublet, and this lens set-up mode is conducive to the correction of the system curvature of field and astigmatism.
Referring to figs. 1 and 2, the zoom lens of the utility model further includes diaphragm 5.In the present embodiment, diaphragm 5
It is set between the second lens group 2 and the third lens group 3.
Referring to figs. 1 and 2, a kind of embodiment according to the present utility model, along optical axis from object side to image side, first
Maximum distance between the object side of 2 first lens of image side surface and the second lens group of 1 the last one lens of lens group is
D12t (i.e. the telescope end that the second lens group 2 is in zoom lens), minimum range are that (i.e. the second lens group 2 is in zoom to d12w
The wide-angle side of camera lens), the object side of 2 first lens of image side surface and the second lens group of 1 the last one lens of the first lens group
Between be minimum range d12w (i.e. the wide-angle side that the second lens group 2 is in zoom lens) when, the first focal length of zoom lens is
fw.In the present embodiment, maximum distance d12t, minimum range d12w and the first focal length fw meet: 1.5≤(d12t-d12w)/
fw≤4.By above-mentioned setting, 1.5≤(d12t-d12w)/fw≤4 are met between the second lens group 2 and the first lens group 1, are protected
It is small to have demonstrate,proved the aberration generated between the first lens group 1 and the second lens group 2, has made the resolving power of the zoom lens of the utility model
Height, imaging clearly.The small volume that can also ensure that the zoom lens of the utility model simultaneously, reduces the change of the utility model
The design and producing cost of zoom lens.If being less than the lower limit of above-mentioned relation formula, produced between the first lens group 1 and the second lens group 2
Raw aberration can become larger, and cause the resolving power of the zoom lens of the utility model to decline, the imaging is not clear；If more than above-mentioned relation
The upper limit of formula causes the volume of the zoom lens of the utility model to increase, and designs and manufactures cost increase.
Referring to figs. 1 and 2, a kind of embodiment according to the present utility model, first lens group 1 the last one lens
2 first lens of image side surface and the second lens group object side between when being minimum range d12w, the first of zoom lens is burnt
It is f2 away from the second lens group focal length for fw, the second lens group 2.In the present embodiment, the first focal length fw and the second lens group
Meet between focal length f2: 1≤| f2 |/fw≤3.It is full between the first focal length fw and the second lens group focal length f2 by above-mentioned setting
Foot 1≤| f2 |/fw≤3, then ensure that the aberration of entire zoom lens when the second lens group 2 is in the telescope end of zoom lens according to
Balance is so kept, the resolving power for improving entire zoom lens when the second lens group 2 is in the telescope end of zoom lens is conducive to, into
One step realizes the blur-free imaging of the zoom lens to distant objects of the utility model.If being less than the lower limit value of above-mentioned relation formula, the
When two lens groups 2 are in the telescope end of zoom lens, the aberration balancing of the zoom lens of the utility model is restricted, resolving power
It is difficult to improve, causes zoom lens fuzzy to image distant objects；If more than above-mentioned relation formula upper limit value when, it is difficult to guarantee this
The zoom lens of utility model takes into account the requirement of big multiplying power zoom and camera lens small size.
Referring to figs. 1 and 2, a kind of embodiment according to the present utility model, first lens group 1 the last one lens
2 first lens of image side surface and the second lens group object side between when being minimum range d12w, the first of zoom lens is burnt
It is f3 away from the third lens group focal length for fw, the third lens group 3.In the present embodiment, the first focal length fw and the third lens group
Meet between focal length f3: 1≤f3/fw≤5.By above-mentioned setting, meet 1 between the first focal length fw and the third lens group focal length f3
≤ f3/fw≤5 then ensure that the third lens group 3 has good tolerance sensitivities, to ensure that the zoom of the utility model
Camera lens resolving power it is consistent, under the premise of guaranteeing the imaging effect of zoom lens of the utility model, it is ensured that this reality
There can be lesser volume with novel zoom lens.If being less than above-mentioned relation formula lower limit value, the tolerance of the third lens group 3 is quick
Sensitivity is deteriorated, and causes the product resolving power consistency of the utility model poor；If more than above-mentioned relation formula upper limit value, lead to this reality
It is increased with the volume (length) of novel zoom lens, is unfavorable for realizing the small size of the zoom lens of the utility model.
Referring to figs. 1 and 2, a kind of embodiment according to the present utility model, along optical axis from object side to image side, first
First Abbe number of first positive power lens of lens group 1 is v1z1, the second of negative-power lenses in the first lens group 1
Abbe number is v1f.In this embodiment party, the first Abbe number v1z1 and the second Abbe number v1f meet: 30≤| v1z1-v1f |≤
70.By above-mentioned setting, the first Abbe number v1z1 and the second Abbe number be v1f full 30≤| v1z1-v1f |≤70, it can be achieved that this
Second lens group 2 of the zoom lens of utility model wide-angle side and telescope end chromatic aberration correction, so that it is practical new to have reached this
The zoom lens of type and then ensure that the image quality of the utility model in the reasonable balance of zoom whole process color difference.
A kind of embodiment according to the present utility model, at least one piece of lens uses high refractive index material in the second lens group 2
Material.In the present embodiment, the refractive index of at least one piece lens is greater than or equal to 1.7 in the second lens group 2.It is set by above-mentioned
It sets, by guaranteeing that at least one piece of lens can satisfy refractive index more than or equal to 1.7 in the second lens group 2, can effectively reduce
The curvature of field and astigmatism that the wide-angle side of the zoom lens of the utility model is generated in big incident angle light, General Promotion sheet are practical new
The resolving power of the zoom lens wide-angle side of type, so ensure that the zoom lens of the utility model near objects it is clear at
Picture.
Referring to figs. 1 and 2, a kind of embodiment according to the present utility model, in the third lens group 3 three it is glued thoroughly
In mirror include at least 1 piece of low dispersion sub-lens, and its Abbe number meet 70≤VD≤100, refractive index meet 1.4≤ND≤
1.55.It should be pointed out that the dispersion of lens is determined by Abbe number, therefore, in the claimed range of above-mentioned Abbe number
Lens are low dispersing lens.By above-mentioned setting, low dispersion is introduced in three balsaming lens in the third lens group 3 thoroughly
Mirror can reasonably balance the color difference that the first lens group 1 and the second lens group 2 generate, reduce the zoom lens of the utility model
Infrared defocusing amount, promoted visible light and infrared light resolving power, to guarantee that the zoom lens of the utility model can be in day
Night is able to achieve blur-free imaging, especially to the blur-free imaging ability under the low light conditions for the zoom lens for improving the utility model
It is beneficial.
Referring to figs. 1 and 2, a kind of embodiment according to the present utility model further includes single in 4th lens group 4
Lens (i.e. non-balsaming lens).In the present embodiment, along optical axis from object side to image side, the first lens of the 4th lens group 4
For single lens, object side is convex surface, and image side surface is concave surface.In the present embodiment, along optical axis from object side to image side, the
The Abbe number of the first lens of four lens groups 4 meets: 40≤vd41≤65, and its refractive index meets: 1.6≤nd41≤
1.75.By above-mentioned setting, the first lens concave surface of the 4th lens group 4 bends towards image planes, is conducive to the zoom of the utility model
The astigmatism of camera lens and the correction of the curvature of field, and can reduce the tolerance sensitivities of the zoom lens of the utility model.Meanwhile the 4th is saturating
The Abbe numbers of the first lens of microscope group 4 meets 40≤vd41≤65, and its refractive index meets 1.6≤nd41≤1.75, can be with
Effectively reduce the color difference and astigmatism of the outer visual field of axis of the zoom lens of the utility model.
Referring to figs. 1 and 2, a kind of embodiment according to the present utility model, along optical axis from object side to image side direction,
The Abbe number v4b1 of first sub-lens of the cemented doublet in the 4th lens group 4 and the Abbe of second sub-lens
V4b2 meets: | v4b1-v4b2 | >=30.By above-mentioned setting, it ensure that the zoom lens of the utility model can preferably be put down
Weigh color difference, improves the image quality of the zoom lens of the utility model.
Zoom lens according to the present utility model, FNO reach starlight grade, and image space F number reaches 1.0~1.4, enables camera lens
Signal-to-noise ratio that is enough to obtain sufficient light-inletting quantity, being reduced in the case where illumination abundance, to obtain clearly image, and this is practical
Novel zoom lens in zooming procedure f-number close to constant, it is ensured that in zooming procedure picture brightness do not change with focal length and
Variation.Meanwhile lens optical design solves temperature drift problems, is not required to focus again within the temperature range of -40 DEG C -80 DEG C
It can guarantee blur-free imaging.In addition, the zoom lens of the utility model realizes that full multiplying power infrared light is confocal, resolution ratio reach 4K with
On, there is excellent resolving power.
Zoom lens according to the present utility model, imaging performance is excellent, while guaranteeing excellent imaging performance, price
It will not be higher by too much compared with mainstream security protection tight shot, the zoom lens of the utility model uses the scheme of full glass spheric glass,
Reasonable abnormal distribution dispersive glass (i.e. low dispersion) and glass of high refractive index reach the imaging effect of high quality, and real
Now full multiplying power is infrared confocal.Meanwhile the rear burnt drift that temperature change is brought is substantially eliminated, make camera lens at -40 DEG C to 80 DEG C
Variation of ambient temperature under, resolution ratio identical with room temperature can be guaranteed by being not required to focus again.Both the excellent of camera lens had been ensure that
Imaging performance, and eyeglass cost is reduced, there is very high cost performance.
It is that the difference of each relevant parameter in zoom lens according to the present utility model provides three groups of embodiments to have below
Body illustrates zoom lens according to the present utility model.
Data in three groups of embodiments are as shown in table 1 below:
Table 1
As shown in Table 1, in the zoom lens of three groups of embodiments according to the present utility model parameters setting, meet this
Requirement of the utility model zoom lens for each Parameter Conditions.
Fig. 1 is the structure chart for schematically showing the zoom lens wide-angle side according to the utility model embodiment 1.Fig. 2 is to show
Meaning property indicates the structure chart of the zoom lens telescope end according to the utility model embodiment 1.
Following table 2 lists the relevant parameter of each lens in embodiment 1, including optical surface serial number (Surf), surface class
Type (Type), radius of curvature (Radius), surface thickness (Thickness), refractive index (nd), Abbe number (vd).In this implementation
In example 1, the system parameter of the zoom lens of the utility model are as follows: optics overall length (TTL)=126mm, F number (Fno)=1.10, extensively
Angle end focal length (i.e. the first focal length) fw=8.016mm, telescope end focal length ft=40.664mm:
Table 2
Following table 3 lists the zoom data of the zoom lens of the utility model:
| Thickness | Wide-angle side | Telescope end |
| D5 | 1.00 | 31.99 |
| D11 | 31.99 | 1.00 |
| D26 | 0.14 | 2.17 |
| D31 | 7.04 | 5.01 |
Table 3
Above embodiment according to the present utility model, referring to figs. 1 and 2, to the zoom lens of the utility model
In lens be numbered, along optical axis from object side to image side direction, the first lens L1, second are followed successively by the first lens group 1
Lens L2 and the third lens L3；The 4th lens L4, the 5th lens L5 and the 6th lens L6 are followed successively by the second lens group 2；?
The 7th lens L7, the 8th lens L8, the 9th lens L9, the tenth lens L10, the 11st lens are followed successively by the third lens group 3
L11, the 12nd lens L12, the 13rd lens L13, the 14th lens L14 and the 15th lens L15, in the 4th lens group 4
It is followed successively by the 16th lens L16, the 17th lens L17, the 18th lens L18.Wherein, the first lens L1 and the second lens L2 structure
At cemented doublet, the 7th lens L7 and the 8th lens L8 constitute cemented doublet, the tenth lens L10, the 11st lens L11 and
12nd lens L12, three balsaming lens of composition, the 13rd lens L13 and the 14th lens L14 composition cemented doublet, the 17th
Lens L17 and the 18th lens L18 constitutes cemented doublet.Meanwhile the object side of each lens and image side surface are numbered, it is
Convenient for narration explanation, along optical axis from object side to image side direction, the optical surface number of each lens is S1-S31, and wherein S12 is light
The face of door screen, in addition, D5 in table 2 and table 3 be the third lens image side surface between the 4th lens object side at a distance from, D11 the
The distance between six lens image side surfaces and the 7th lens object side, D26 are the 15th lens image side surface and the 16th lens object side
The distance between face, D31 are the distance between the 18th lens image side surface and image planes.In table 2, standard indicates optics table
The surface type in face is standard ball type.
In the present embodiment, the 4th lens L4 and the 6th lens L6 uses high-index material, wherein the 4th lens L4
Refractive index be 1.75, the refractive index of the 6th lens L6 is 1.85.Tenth lens L10, the 11st lens L11 and the 12nd lens
In three balsaming lens that L12 is constituted, the 12nd lens L12 is low dispersion material, and the refractive index of the 12nd lens L12 is
1.46, Abbe number 90.20.
By table 1, table 2 and table 3 it is found that in the present embodiment, the setting of each lens relevant parameter meets the utility model change
The condition requirement of zoom lens.Fig. 3-Fig. 8 is the wide-angle for schematically showing the zoom lens according to the utility model embodiment 1 respectively
The chromatism of position at end, ratio chromatism, distortion figure, the chromatism of position of telescope end, ratio chromatism, distortion figure.By Fig. 3-Fig. 8 it is found that
The zoom lens that the utility model is arranged according to the relevant parameter of each lens in embodiment 1, can make the change of the utility model
Zoom lens.Lens optical design solves temperature drift problems, is not required to focus again i.e. within the temperature range of -40 DEG C -80 DEG C
It can guarantee blur-free imaging.In addition, the zoom lens of the utility model realizes that full multiplying power infrared light is confocal, resolution ratio reach 4K with
On, there is excellent resolving power.
Fig. 9 is the structure chart for schematically showing the zoom lens wide-angle side according to the utility model embodiment 2.Figure 10 is to show
Meaning property indicates the structure chart of the zoom lens telescope end according to the utility model embodiment 2.
Following table 4 lists the relevant parameter of each lens in embodiment 2, including optical surface serial number (Surf), surface class
Type (Type), radius of curvature (Radius), surface thickness (Thickness), refractive index (nd), Abbe number (vd).In this implementation
In example 2, the system parameter of the zoom lens of the utility model is optics overall length (TTL)=116mm, F number (Fno)=1.40, extensively
Angle end focal length (i.e. the first focal length) fw=7.153mm, telescope end focal length ft=32.368mm:
Table 4
Following table 5 lists the zoom data of the zoom lens of the utility model:
| Thickness | Wide-angle side | Telescope end |
| D5 | 7.15 | 32.37 |
| D10 | 26.21 | 1.00 |
| D24 | 0.39 | 8.03 |
| D29 | 11.57 | 3.95 |
Table 5
Above embodiment according to the present utility model, in conjunction with shown in Fig. 9 and Figure 10, to the zoom lens of the utility model
In lens be numbered, along optical axis from object side to image side direction, the first lens L1, second are followed successively by the first lens group 1
Lens L2 and the third lens L3；The 4th lens L4, the 5th lens L5 and the 6th lens L6 are followed successively by the second lens group 2；?
The 7th lens L7, the 8th lens L8, the 9th lens L9, the tenth lens L10, the 11st lens are followed successively by the third lens group 3
L11, the 12nd lens L12, the 13rd lens L13, the 14th lens L14,；The 15th is followed successively by the 4th lens group 4 thoroughly
Mirror L15, the 16th lens L16 and the 17th lens L17, wherein the first lens L1 and the second lens L2 constitutes cemented doublet,
9th lens L9, the tenth lens L10, the 11st lens L11 constitute three balsaming lens, the 12nd lens L12, the 13rd lens
L13 constitutes cemented doublet, and the 16th lens L16 and the 17th lens L17 constitute cemented doublet.Meanwhile to each lens
Object side and image side surface are numbered, for the ease of narration explanation, along optical axis from object side to image side direction, the optical surface of each lens
Number is S1-S29, and wherein S11 is the face of diaphragm, in addition, D5 is the third lens image side surface and the 4th lens object in table 4 and table 5
The distance between side, D10 are the distance between the 6th lens image side surface and the 7th lens object side, and D24 is the 14th lens
The distance between image side surface and the 15th lens object side, D29 are the distance between the 17th lens image side surface and image planes.In table
In 4, standard indicates that the surface type of optical surface is standard ball type.
In the present embodiment, the 5th lens L5 and the 6th lens L6 uses high-index material, wherein the 5th lens L5
Refractive index be 1.77, the refractive index of the 6th lens L6 is 1.90.9th lens L9, the tenth lens L10, the 11st lens L11
It constituting in three balsaming lens, the 11st lens L11 is low dispersion material, and the refractive index of the 11st lens L11 is 1.46,
Abbe number is 90.20.
By table 1, table 4 and table 5 it is found that in the present embodiment, the setting of each lens relevant parameter meets the utility model change
The condition requirement of zoom lens.Figure 11-Figure 16 is schematically shown according to the wide of the zoom lens of the utility model embodiment 2 respectively
The chromatism of position at angle end, ratio chromatism, distortion figure, the chromatism of position of telescope end, ratio chromatism, distortion figure.It can by Figure 11-Figure 16
Know, the zoom lens of the utility model is arranged according to the relevant parameter of each lens in embodiment 2, the utility model can be made
Zoom lens.Lens optical design solves temperature drift problems, is not required to focus again within the temperature range of -40 DEG C -80 DEG C
It can guarantee blur-free imaging.In addition, the zoom lens of the utility model realizes that full multiplying power infrared light is confocal, resolution ratio reach 4K with
On, there is excellent resolving power.
Figure 17 is the structure chart for schematically showing the zoom lens wide-angle side according to the utility model embodiment 3.Figure 18 is
Schematically show the structure chart of the zoom lens telescope end according to the utility model embodiment 3.
Following table 6 lists the relevant parameter of each lens in embodiment 3, including optical surface serial number (Surf), surface class
Type (Type), radius of curvature (Radius), surface thickness (Thickness), refractive index (nd), Abbe number (vd).In this implementation
In example 3, the system parameter of the zoom lens of the utility model is optics overall length (TTL)=125mm, F number (Fno)=1.20, extensively
Angle end focal length (i.e. the first focal length) fw=10.017mm, telescope end focal length ft=40.479mm:
Table 6
Following table 7 lists the zoom data of the zoom lens of the utility model:
| Thickness | Wide-angle side | Telescope end |
| D5 | 1.00 | 22.86 |
| D11 | 24.41 | 2.55 |
| D25 | 0.25 | 3.78 |
| D28 | 14.67 | 11.13 |
Table 7
Above embodiment according to the present utility model, in conjunction with shown in Figure 17 and Figure 18, to the varifocal mirror of the utility model
Lens in head are numbered, and along optical axis from object side to image side direction, the first lens L1, the are followed successively by the first lens group 1
Two lens L2 and the third lens L3；The 4th lens L4, the 5th lens L5 and the 6th lens L6 are followed successively by the second lens group 2；
The 7th lens L7, the 8th lens L8, the 9th lens L9, the tenth lens L10, the 11st lens are followed successively by the third lens group 3
L11, the 12nd lens L12, the 13rd lens L13；The 14th lens L14, the 15th lens are followed successively by the 4th lens group 4
L15, the 16th lens L16 and the 17th lens L17, wherein the first lens L1 and the second lens L2 constitutes cemented doublet, the
Eight lens L8, the 9th lens L9 constitute cemented doublet, and the tenth lens L10, the 11st lens L11, the 12nd lens L12 are constituted
Three balsaming lens, the 16th lens L16 and the 17th lens L17 constitute cemented doublet.Meanwhile to the object side of each lens and
Image side surface is numbered, and for the ease of narration explanation, along optical axis from object side to image side direction, the optical surface number of each lens is
S1-S30, wherein S12 is the face of diaphragm, in addition, in table 6 and table 7, D5 be the third lens image side surface and the 4th lens object side it
Between distance, D11 be the distance between the 6th lens image side surface and the 7th lens object side, D25 be the 14th lens image side surface
The distance between 15th lens object side, D30 are the distance between the 17th lens image side surface and image planes.In table 6,
Standard indicates that the surface type of optical surface is standard ball type.
In the present embodiment, the 7th lens L7 uses high-index material, wherein the refractive index of the 7th lens L7 is
1.73, the tenth lens L10, the 11st lens L11, the 12nd lens L12 are constituted in three balsaming lens, and the tenth lens L10 is low
Dispersive glass material, and the refractive index of the tenth lens L10 is 1.44, Abbe number 95.1.
By table 1, table 6 and table 7 it is found that in the present embodiment, the setting of each lens relevant parameter meets the utility model change
The condition requirement of zoom lens.Figure 19-Figure 24 is schematically shown according to the wide of the zoom lens of the utility model embodiment 3 respectively
The chromatism of position at angle end, ratio chromatism, distortion figure, the chromatism of position of telescope end, ratio chromatism, distortion figure.It can by Figure 19-Figure 24
Know, the zoom lens of the utility model is arranged according to the relevant parameter of each lens in embodiment 3, the utility model can be made
Zoom lens.Lens optical design solves temperature drift problems, is not required to focus again within the temperature range of -40 DEG C -80 DEG C
It can guarantee blur-free imaging.In addition, the zoom lens of the utility model realizes that full multiplying power infrared light is confocal, resolution ratio reach 4K with
On, there is excellent resolving power.
Above content is only the example of the concrete scheme of the utility model, for the equipment and knot of wherein not detailed description
Structure, it should be understood that the existing common apparatus in this field and universal method is taken to be practiced.
The foregoing is merely a schemes of the utility model, are not intended to limit the utility model, for ability
For the technical staff in domain, various modifications and changes may be made to the present invention.It is all the spirit and principles of the utility model it
Interior, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (11)
1. a kind of zoom lens, which is characterized in that including along optical axis be arranged successively from object side to image side with positive light coke
First lens group (1), the second lens group (2) with negative power, the third lens group (3) with positive light coke and have just
4th lens group (4) of focal power；
When zooming, second lens group (2) and the 4th lens group (4) linearly move back and forth along the optical axis；
Along optical axis from object side to image side, the first lens in first lens group (1) are set as negative-power lenses, described
First lens in second lens group (2) are set as negative-power lenses.
2. zoom lens according to claim 1, which is characterized in that first lens group (1) includes at least one piece and bears
Power lenses and two pieces of positive power lens；
Second lens group (2) includes at least two pieces of negative-power lenses and one piece of positive optic angle power lenses；
The third lens group (3) includes at least one piece of three balsaming lens, one piece of cemented doublet and one piece of meniscus lens；
4th lens group (4) includes at least one piece of cemented doublet.
3. zoom lens according to claim 1 or 2, which is characterized in that it further include diaphragm (5), diaphragm (5) setting
Between second lens group (2) and the third lens group (3).
4. zoom lens according to claim 1 or 2, which is characterized in that along optical axis from object side to image side, described first thoroughly
Between the image side surface of microscope group (1) the last one lens and the object side of second lens group (2) first lens it is maximum away from
From for d12t, minimum range d12w, the image side surface of the last one lens of the first lens group (1) and second lens group
(2) when being minimum range d12w between the object side of first lens, the first focal length of the zoom lens is fw, then it is described most
Distance d12t greatly, minimum range d12w and the first focal length fw meet: 1.5≤(d12t-d12w)/fw≤4.
5. zoom lens according to claim 1 or 2, which is characterized in that described the last one lens of first lens group (1)
Image side surface and second lens group (2) first lens object side between be minimum range d12w when, the varifocal mirror
First focal length of head is fw, and the second lens group focal length of second lens group (2) is f2, the first focal length fw and described the
Meet between two lens group focal length f2: 1≤| f2 |/fw≤3.
6. zoom lens according to claim 1 or 2, which is characterized in that described the last one lens of first lens group (1)
Image side surface and second lens group (2) first lens object side between be minimum range d12w when, the varifocal mirror
First focal length of head is fw, and the third lens group focal length of the third lens group (3) is f3, the first focal length fw and described the
Meet between three lens group focal length f3: 1≤f3/fw≤5.
7. zoom lens according to claim 1 or 2, which is characterized in that along optical axis from object side to image side, described first thoroughly
First Abbe number of first positive power lens of microscope group (1) is v1z1, negative-power lenses in first lens group (1)
The second Abbe number be v1f, then the first Abbe number v1z1 and the second Abbe number v1f meet: 30≤| v1z1-v1f |
≤70。
8. zoom lens according to claim 1 or 2, which is characterized in that in second lens group (2) at least one piece thoroughly
The refractive index of mirror is greater than or equal to 1.7.
9. zoom lens according to claim 2, which is characterized in that three balsaming lens in the third lens group (3)
In include at least 1 piece of low dispersion sub-lens, and its Abbe number meet 70≤VD≤100, refractive index meet 1.4≤ND≤
1.55。
10. zoom lens according to claim 2, which is characterized in that along optical axis from object side to image side, the 4th lens
The first lens of group (4) are single lens, and object side is convex surface, and image side surface is concave surface；
Along optical axis from object side to image side, the Abbe number of the first lens of the 4th lens group (4) meets: 40≤vd41≤
65, and its refractive index meets: 1.6≤nd41≤1.75.
11. the zoom lens according to claim 2 or 10, which is characterized in that along optical axis from object side to image side, the described 4th
The Abbe number v4b1 of first sub-lens of the cemented doublet in lens group (4) and the Abbe v4b2 of second sub-lens
Meet: | v4b1-v4b2 | >=30.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821657557.2U CN208888463U (en) | 2018-10-12 | 2018-10-12 | A kind of zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821657557.2U CN208888463U (en) | 2018-10-12 | 2018-10-12 | A kind of zoom lens |
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ID=66515859
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109143554A (en) * | 2018-10-12 | 2019-01-04 | 舜宇光学(中山)有限公司 | A kind of zoom lens |
| CN110927942A (en) * | 2019-11-29 | 2020-03-27 | 中船重工海为郑州高科技有限公司 | Optical zoom imaging device of photoelectric detection system for foreign objects on airport runway |
| CN111025609A (en) * | 2019-12-06 | 2020-04-17 | 浙江大华技术股份有限公司 | Lens |
-
2018
- 2018-10-12 CN CN201821657557.2U patent/CN208888463U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109143554A (en) * | 2018-10-12 | 2019-01-04 | 舜宇光学(中山)有限公司 | A kind of zoom lens |
| CN110927942A (en) * | 2019-11-29 | 2020-03-27 | 中船重工海为郑州高科技有限公司 | Optical zoom imaging device of photoelectric detection system for foreign objects on airport runway |
| CN111025609A (en) * | 2019-12-06 | 2020-04-17 | 浙江大华技术股份有限公司 | Lens |
| CN111025609B (en) * | 2019-12-06 | 2022-02-18 | 浙江大华技术股份有限公司 | Lens |
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