CN205067847U - Optical lens - Google Patents
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- CN205067847U CN205067847U CN201520869847.3U CN201520869847U CN205067847U CN 205067847 U CN205067847 U CN 205067847U CN 201520869847 U CN201520869847 U CN 201520869847U CN 205067847 U CN205067847 U CN 205067847U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 140
- 239000005304 optical glass Substances 0.000 claims abstract description 13
- 230000005499 meniscus Effects 0.000 claims description 73
- 239000000463 material Substances 0.000 claims description 12
- 230000014509 gene expression Effects 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 3
- 230000004075 alteration Effects 0.000 abstract description 37
- 201000009310 astigmatism Diseases 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 7
- 239000006185 dispersion Substances 0.000 abstract description 5
- 206010073261 Ovarian theca cell tumour Diseases 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000004297 night vision Effects 0.000 abstract description 4
- 208000001644 thecoma Diseases 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
- 238000012634 optical imaging Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 19
- 238000003384 imaging method Methods 0.000 description 12
- 238000012544 monitoring process Methods 0.000 description 11
- 238000012546 transfer Methods 0.000 description 6
- 206010010071 Coma Diseases 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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Abstract
The utility model relates to an optical imaging technical field discloses an optical lens, inclines for instance the side includes in proper order along optical axis direction accessory things: it is positive fourth battery of lens for second battery of lens, the focal power of burden for positive third battery of lens, focal power that the focal power is positive first battery of lens, focal power, through inclining extremely for instance order that the side was arranged in proper order and each optical lens's designs such as focal power distribution to each optical lens accessory things, the feasible structural style who zooms optical lens, the focal power distribution, fine matching is carried out with the image -forming condition to optical glass's refracting index and chromatic dispersion coefficient isoparametric, and then messenger optical lens's spherical aberration, the coma, the astigmatism, the curvature of field, the multiplying power colour difference, the position colour difference has obtained fine correction, thereby make optical lens can reach higher resolution ratio demand and geng jia's infrared night vision effect, realize all -weather super high definition video control, satisfy the clear security protection monitored control system's of current and following superelevation development demand.
Description
Technical Field
The utility model relates to an optical imaging technical field, in particular to optical lens.
Background
With the development of security monitoring industry, people have higher and higher requirements on the quality of monitoring information, especially on the definition of monitoring images.
In recent years, with the technical innovation and breakthrough of a data transmission technology, a data storage technology, an image processing technology and a high-definition television display technology, the realization of ultra-high-definition video monitoring with 4K resolution becomes possible and is bound to become a development trend in the future; this requires a higher resolution of the lens (optical lens) to meet the imaging requirements of the 4K camera.
The resolution level of the existing zoom optical lens in a visible light mode can only meet the requirement of a camera with less than 500 ten thousand pixels; and when switching to an infrared mode at night for image acquisition, the confocal performance is poor, causing the definition of the image acquired by the optical lens at night to be worse than that of the image acquired under the visible light condition. The main reasons for this phenomenon are: the structural form, focal power distribution, refractive index, dispersion coefficient and other parameters of the existing zoom optical lens are not well matched with imaging conditions, so that the spherical aberration, coma aberration, astigmatism, field curvature, chromatic aberration of magnification and position chromatic aberration of the optical lens are not well corrected, and higher optical performance cannot be realized.
Therefore, the zoom optical lens in the prior art cannot meet the development requirements of the current and future ultra-high-definition security video monitoring system.
SUMMERY OF THE UTILITY MODEL
The utility model provides an optical lens can make optical lens's structural style, focal power distribution, optical glass's refracting index and dispersion coefficient isoparametric and imaging condition carry out fine matching, and then make optical lens's spherical aberration, coma, astigmatism, field curvature, magnification chromatic aberration, position chromatic aberration obtain correcting, realize higher optical performance.
In order to achieve the above object, the utility model provides a following technical scheme:
an optical lens comprising, in order from an object side to an image side in an optical axis direction: the lens comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power and a fourth lens group with positive focal power; wherein,
the first lens group sequentially comprises a first meniscus lens with negative focal power, a first biconvex lens with positive focal power and a second meniscus lens with positive focal power, which are coaxially arranged from the object side to the image side; the surfaces, facing the object side, of the first meniscus lens and the second meniscus lens are convex surfaces;
the second lens group comprises a first lens with negative focal power, a second biconcave lens with negative focal power and a third meniscus lens with positive focal power which are coaxially arranged in sequence from the object side to the image side; the surface of the third meniscus lens, which faces the object side, is a convex surface;
the third lens group comprises a second biconvex lens with positive focal power, a fourth meniscus lens with positive focal power, a third biconvex lens with positive focal power and a biconcave lens with negative focal power, which are coaxially arranged from the object side to the image side in sequence; the surface of the fourth meniscus lens, which faces the object side, is a convex surface;
the fourth lens group sequentially comprises a fourth biconcave lens with negative focal power, a fourth biconvex lens with positive focal power, a fifth meniscus lens with negative focal power, a fifth biconvex lens with positive focal power and a sixth meniscus lens with positive focal power, which are coaxially arranged from the object side to the image side; the surface of the fifth meniscus lens facing the object side is a convex surface, and the surface of the sixth meniscus lens facing the object side is a convex surface.
In the optical lens, the first lens group, the second lens group, the third lens group and the fourth lens group are formed by fifteen optical lenses with specific structural shapes, the power of each optical lens is distributed in the order of the optical lenses arranged in order from the object side to the image side, and the selection of optical glass materials, and the like, so that the parameters of the structure form, the focal power distribution, the refractive index, the dispersion coefficient and the like of the optical glass are matched with the imaging conditions, thereby the spherical aberration, the coma aberration, the astigmatism, the field curvature, the magnification chromatic aberration and the position chromatic aberration of the optical lens are well corrected, and then the optical lens can meet the requirements of higher resolution and better infrared night vision effect, realize all-weather ultrahigh-definition video monitoring and meet the development requirements of the current and future ultrahigh-definition security monitoring systems.
Preferably, the surface of the first lens, which faces the object side and has negative optical power, may be a concave surface, a flat surface or a convex surface; and/or the presence of a gas in the gas,
the surface of the third meniscus lens having positive optical power facing the image side may also be flat or convex.
Preferably, the first lens group is a front fixed group, the second lens group is a zoom group, the third lens group is a rear fixed group, and the fourth lens group is a compensation group.
Preferably, the third lens group further includes an aperture stop coaxially disposed between the second biconvex lens and the fourth meniscus lens.
Preferably, the second biconcave type lens is cemented with a third meniscus type lens, the third biconvex type lens is cemented with a third biconcave type lens, the fourth biconcave type lens is cemented with a fourth biconvex type lens, and the fifth meniscus type lens is cemented with a fifth biconvex type lens.
Preferably, the optical lens satisfies the following conditional expression:
5.04≤L/(ft/fw)2≤10；
wherein: l represents the total optical length of the optical lens, fwDenotes the focal length of the optical lens in the shortest focal state, ftIndicating the focal length of the optical lens in the longest focal state.
Preferably, the optical lens satisfies the following conditional expression:
0.35<f4/ft<0.67；
wherein: f. of4Denotes a focal length of the fourth lens group.
Preferably, the optical lens satisfies the following conditional expression:
4.71<Nn/(ft/fw)<7.85；
wherein: n is a radical ofnThe average refractive index of the glass material of the second biconvex lens, the fourth meniscus lens and the third biconvex lens having positive refractive power in the third lens group is shown.
Preferably, the abbe number of the fifth biconvex lens is greater than 80, and the refractive index is less than 1.5.
Preferably, the parameters of each optical lens satisfy in turn:
watch 1
Where R1 is a curvature radius of a surface of each lens facing the object side, R2 is a curvature radius of a surface of each lens facing the image side, Tc is a center thickness of each lens, Nd is a refractive index of an optical glass material of each lens, and Vd is an abbe number of the optical glass material of each lens.
Drawings
Fig. 1a is a schematic structural diagram of an optical lens in a short focus state according to an embodiment of the present invention;
FIG. 1b is a schematic structural diagram of the optical lens shown in FIG. 1a in a telephoto state;
fig. 2 is a graph of an optical transfer function corresponding to the zoom optical lens according to the embodiment of the present invention in a short focus state;
fig. 3 is a graph of an optical transfer function corresponding to the zoom optical lens according to the embodiment of the present invention in a telephoto state;
fig. 4a to fig. 4f are corresponding light sector diagrams of the zoom optical lens according to the embodiment of the present invention in a short-focus state;
fig. 5a to 5f are corresponding light sector diagrams of the zoom optical lens according to the embodiment of the present invention in the telephoto state;
fig. 6a to fig. 6f are dot charts corresponding to the zoom optical lens according to the embodiment of the present invention in a short-focus state;
fig. 7a to 7f are dot charts corresponding to the zoom optical lens according to the embodiment of the present invention in the telephoto state;
fig. 8a is a field curvature diagram of the zoom optical lens according to the embodiment of the present invention in a short focus state;
fig. 8b is a distortion diagram of the zoom optical lens according to the embodiment of the present invention in a short focus state;
fig. 9a is a field curvature diagram of a zoom optical lens according to an embodiment of the present invention in a telephoto state;
fig. 9b is a distortion diagram of the zoom optical lens according to the embodiment of the present invention in a telephoto state;
fig. 10 is a diagram of chromatic aberration corresponding to a zoom optical lens according to an embodiment of the present invention in a short-focus state;
fig. 11 is a chromatic aberration diagram of the zoom optical lens according to the embodiment of the present invention in a telephoto state.
Reference numerals:
10, a first lens group; 11, a first meniscus lens; 12, a first biconvex lens;
13, a second meniscus lens; 20, a second lens group; 21, a first lens;
22, a second biconcave lens; 23, a third meniscus lens; 30, a third lens group;
31, a second biconvex lens; 32, a fourth meniscus lens; 33, a third biconvex lens;
34, a third biconcave lens; 40, a fourth lens group; 41, a fourth biconcave lens;
42, a fourth biconvex lens; 43, a fifth meniscus lens, 44, a fifth biconvex lens;
45, a sixth meniscus lens; 50, aperture stop.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention; it is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1a and 1b, the present invention provides an optical lens, sequentially from an object side to an image side along an optical axis direction, comprising: a first lens group 10 having positive power, a second lens group 20 having negative power, a third lens group 30 having positive power, a fourth lens group 40 having positive power, wherein,
the first lens group 10 includes, in order from the object side to the image side, a first meniscus lens 11 having negative refractive power, a first biconvex lens 12 having positive refractive power, and a second meniscus lens 13 having positive refractive power, which are coaxially arranged; the surfaces of the first meniscus lens 11 and the second meniscus lens 13 facing the object side are convex surfaces;
the second lens group 20 includes, in order from the object side to the image side, a first lens 21 having negative power, a second biconcave lens 22 having negative power, and a third meniscus lens 23 having positive power, which are coaxially arranged; the surface of the third meniscus lens 23 facing the object side is a convex surface;
the third lens group 30 includes, in order from the object side to the image side, a second biconvex lens 31 having positive optical power, a fourth meniscus lens 32 having positive optical power, a third biconvex lens 33 having positive optical power, and a third biconcave lens 34 having negative optical power, which are coaxially arranged; the surface of the fourth meniscus lens 32 facing the object side is a convex surface;
the fourth lens group 40 includes, in order from the object side to the image side, a coaxially arranged fourth biconcave lens 41 having negative refractive power, a fourth biconvex lens 42 having positive refractive power, a fifth meniscus lens 43 having negative refractive power, a fifth biconvex lens 44 having positive refractive power, and a sixth meniscus lens 45 having positive refractive power; the surface of the fifth meniscus lens 43 facing the object side is convex, and the surface of the sixth meniscus lens 45 facing the object side is convex.
In the optical lens, the first lens group 10, the second lens group 20, the third lens group 30 and the fourth lens group 40 are composed of fifteen optical lenses with specific structural shapes, and through the design of the sequence of the optical lenses arranged in sequence from the object side to the image side, the distribution of the focal power of each optical lens and the like, the structural form, the focal power distribution, the refractive index, the dispersion coefficient and other parameters of optical glass of the zoom optical lens are matched with the imaging conditions, so that the spherical aberration, the coma aberration, the astigmatism, the field curvature, the chromatic aberration of magnification and the chromatic aberration of position of the optical lens are well corrected, the optical lens can achieve higher resolution requirements and better infrared night vision effects, all-weather ultra-high definition video monitoring is realized, and the development requirements of the current and future ultra-high definition security monitoring systems are met.
In a preferred embodiment, the surface of the first lens 21 facing the object side, which has negative optical power, is a plane or a convex surface, but the surface of the first lens 21 facing the object side may also be a concave surface, that is, the first lens 21 is a biconcave lens; the surface of the third meniscus lens 23 having positive optical power facing the image side may also be flat or convex.
In a preferred embodiment, in order to realize a constant aperture of the optical lens, a four-component structure is adopted, in which the first lens group 10 is a front fixed group, the second lens group 20 is a variable power group, the third lens group 30 is a rear fixed group, and the fourth lens group 40 is a compensation group.
In a preferred mode, as shown in fig. 1a and 1b, the third lens group 30 further comprises an aperture stop 50 coaxially arranged between the second biconvex lens 31 and the fourth meniscus lens 32, in order to limit the light flux entering the optical lens and to make a reasonable choice of the light rays that are advantageous for imaging during the change of the full focal length.
In a preferred mode, in order to further correct the chromatic aberration value of the optical lens system (optical lens), the first meniscus lens 11 is cemented with the first biconvex lens 12, the second biconcave lens 22 is cemented with the third meniscus lens 23, the third biconvex lens 33 is cemented with the third biconcave lens 34, the fourth biconcave lens 41 is cemented with the fourth biconvex lens 42, and the fifth meniscus lens 43 is cemented with the fifth biconvex lens 44.
In a preferred mode, the optical lens satisfies the following conditional expression:
5.04≤L/(ft/fw)2≤10；
wherein: l represents the total optical length of the optical lens, fwDenotes the focal length of the optical lens in the shortest focal state, ftIndicating the focal length of the optical lens in the longest focal state.
Further, the optical lens satisfies the following conditional expressions:
0.35<f4/ft<0.67；
wherein: f. of4Denotes a focal length of the fourth lens group.
Further, the optical lens satisfies the following conditional expressions:
4.71<Nn/(ft/fw)<7.85；
wherein: n is a radical ofnThe average refractive index of the glass material of the second biconvex lens 31, the fourth meniscus lens 32, and the third biconvex lens 33 having positive power in the third lens group 30 is shown.
Further, the abbe number of the fifth biconvex lens 44 is greater than 80, and the refractive index is less than 1.5.
Specifically, each parameter of each optical lens satisfies in turn:
watch two
Where R1 is a curvature radius of a surface of each lens facing the object side, R2 is a curvature radius of a surface of each lens facing the image side, Tc is a center thickness of each lens, Nd is a refractive index of an optical glass material of each lens, and Vd is an abbe number of the optical glass material of each lens.
When the above conditions are met, the aberration of the optical lens can be well corrected, and the zoom magnification of the optical lens can meet the use requirement.
The optical lens is analyzed and explained below by combining a specific implementation manner of the optical lens and experimental analysis data of the specific implementation manner.
In one specific implementation, the parameters of each lens of the optical lens satisfy the conditions listed in the following table:
watch III
Wherein R1 is a curvature radius of a surface of the lens facing the object side, R2 is a curvature radius of a surface of the lens facing the image side, Tc is a lens center thickness, Nd is a refractive index of the lens optical glass material, and Vd is an abbe number of the lens optical glass material.
And in the specific implementation mode, the air spacing distance between the lenses in the optical lens further satisfies the following conditions:
in the first lens group 10, the air space between the first biconvex lens 12 and the second meniscus lens 13 is 0.2 mm;
in the second lens group 20, the air space between the first lens 21 and the second biconcave lens 22 is 3.76 mm;
in the third lens group 30, the air space between the second biconvex lens 31 and the fourth meniscus lens 32 is 3.79, and the air space between the fourth meniscus lens 32 and the third biconvex lens 33 is 0.1 mm;
in the fourth lens group 40, the air space between the fourth biconvex lens 42 and the fifth meniscus lens 43 is 0.1mm, and the air space between the fifth biconvex lens 44 and the sixth meniscus lens 45 is 0.1 mm.
Fig. 1a shows a schematic structural diagram of the optical lens in a short focus state, and fig. 1b shows a schematic structural diagram of the optical lens in a long focus state. In the zooming process of the zoom optical lens, the air interval between the second meniscus lens 13 and the first lens 21 ranges from 2.19mm to 25.96mm, the air interval between the third meniscus lens 23 and the second biconvex lens 31 ranges from 26.25mm to 2.48mm, the air interval between the fourth biconcave lens 41 and the third biconcave lens 34 ranges from 6.3mm to 3.37mm, and the air interval between the sixth meniscus lens 45 and the image plane ranges from 10.56mm to 13.48 mm.
The optical lens has the following optical technical indexes:
the total optical length TTL is less than or equal to 102.6 mm;
the system focal length f of the optical lens is 10.5-42 mm;
system image plane of optical lens: 1/1.7';
the aperture range F was constant at 1.5.
FIG. 2 is a graph of an optical transfer function corresponding to a zoom optical lens in a short-focus state; FIG. 3 is a graph of an optical transfer function corresponding to a zoom optical lens in a telephoto state; the optical transfer function is used for evaluating the imaging quality of an optical system, and the higher and smoother curve of the optical transfer function indicates that the imaging quality of the system is better.
As can be seen from fig. 2 and fig. 3, the corresponding MTF curves of the optical lens in the short focus state and the long focus state are relatively consistent, the MTF curves in both states are relatively smooth and concentrated, and the average MTF value in the full field of view is more than 0.64, which indicates that the optical lens can ensure good imaging quality in the whole variable focal length range; from the results, it can be seen that the optical lens provided in this embodiment corrects various aberrations, such as spherical aberration, coma, astigmatism, field curvature, chromatic aberration of magnification, and positional chromatic aberration, so as to improve resolution and meet the imaging requirements of ultrahigh-pixel cameras such as 1200-ten-thousand pixels and 4K.
4 a-4 f are corresponding light ray fan diagrams of the zoom optical lens in a short-focus state; FIGS. 5 a-5 f are corresponding light ray fans of the zoom lens in the telephoto state; as can be seen from fig. 4a to 4f and fig. 5a to 5f, the optical lens provided in this embodiment can achieve good imaging quality in the entire variable focal length range.
Fig. 6a to 6f are dot charts of the zoom optical lens in the short-focus state, and the parameters are as follows:
watch four
| Field of view | 1 | 2 | 3 | 4 | 5 | 6 |
| Centroid radius (mm) | 2.053 | 3.009 | 2.079 | 2.006 | 2.686 | 4.117 |
| Geometric radius (mm) | 4.058 | 8.486 | 8.598 | 6.602 | 7.299 | 10.244 |
Fig. 7a to 7f are dot charts of the zoom optical lens in the telephoto state, and the parameters are as follows:
watch five
| Field of view | 1 | 2 | 3 | 4 | 5 | 6 |
| Centroid radius (mm) | 2.161 | 3.313 | 2.862 | 2.396 | 2.698 | 3.190 |
| Geometric radius (mm) | 5.176 | 12.619 | 13.709 | 10.038 | 9.421 | 8.656 |
As can be seen from fig. 6a to 6f and fig. 7a to 7f, the optical lens provided in this embodiment can achieve good imaging quality in the entire variable focal length range.
A field curvature diagram corresponding to the optical lens in a short-focus state is shown in fig. 8a, a distortion diagram corresponding to the optical lens in a short-focus state is shown in fig. 8b, wherein three curves T respectively represent aberrations of meridional beams (tagentialrays) corresponding to three wavelengths (486nm, 587nm and 656nm), and three curves S respectively represent aberrations of sagittal beams (sagittalrays) corresponding to three wavelengths (486nm, 587nm and 656 nm);
fig. 9a shows a field curvature diagram corresponding to the optical lens in a telephoto state, fig. 9b shows a distortion diagram corresponding to the optical lens in a telephoto state, in which three curves T respectively show aberrations of meridional beams (tagentialrays) corresponding to three wavelengths (486nm, 587nm, and 656nm), and three curves S respectively show aberrations of sagittal beams (sagittalrays) corresponding to three wavelengths (486nm, 587nm, and 656 nm).
As can be seen from fig. 8a, 8b, 9a, and 9b, the field curvature and distortion of the optical lens provided in this embodiment in the short focus state and the long focus state are controlled within a reasonable range of values.
FIG. 10 is a diagram of chromatic aberration corresponding to a zoom lens in a telephoto state, where the curve represents a primary chromatic aberration characteristic curve; fig. 11 is a diagram of chromatic aberration corresponding to the zoom optical lens in a telephoto state, where the curve represents a primary chromatic aberration characteristic curve.
As can be seen from fig. 10 and 11, the chromatic aberration of the zoom lens provided by the present embodiment is controlled within a small range.
Therefore, according to the analysis results, the spherical aberration, the coma aberration, the astigmatism, the field curvature, the magnification chromatic aberration and the position chromatic aberration of the optical lens provided by the specific implementation mode are well corrected, so that the optical lens can achieve higher resolution requirements and better infrared night vision effects, all-weather ultrahigh-definition video monitoring is realized, and the development requirements of the current and future ultrahigh-definition security monitoring systems are met.
It will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An optical lens comprising, in order from an object side to an image side in an optical axis direction: the lens comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power and a fourth lens group with positive focal power; wherein,
the first lens group sequentially comprises a first meniscus lens with negative focal power, a first biconvex lens with positive focal power and a second meniscus lens with positive focal power, which are coaxially arranged from the object side to the image side; the surfaces, facing the object side, of the first meniscus lens and the second meniscus lens are convex surfaces;
the second lens group comprises a first lens with negative focal power, a second biconcave lens with negative focal power and a third meniscus lens with positive focal power which are coaxially arranged in sequence from the object side to the image side; the surface of the third meniscus lens, which faces the object side, is a convex surface;
the third lens group comprises a second biconvex lens with positive focal power, a fourth meniscus lens with positive focal power, a third biconvex lens with positive focal power and a biconcave lens with negative focal power, which are coaxially arranged from the object side to the image side in sequence; the surface of the fourth meniscus lens, which faces the object side, is a convex surface;
the fourth lens group sequentially comprises a fourth biconcave lens with negative focal power, a fourth biconvex lens with positive focal power, a fifth meniscus lens with negative focal power, a fifth biconvex lens with positive focal power and a sixth meniscus lens with positive focal power, which are coaxially arranged from the object side to the image side; the surface of the fifth meniscus lens facing the object side is a convex surface, and the surface of the sixth meniscus lens facing the object side is a convex surface.
2. An optical lens according to claim 1, wherein the surface of the first lens element having negative optical power facing the object side is a concave surface, a flat surface, or a convex surface; and/or the presence of a gas in the gas,
the surface of the third meniscus lens having positive optical power facing the image side may be a flat surface or a convex surface.
3. An optical lens barrel according to claim 1, wherein the first lens group is a front fixed group, the second lens group is a variable magnification group, the third lens group is a rear fixed group, and the fourth lens group is a compensation group.
4. An optical lens according to claim 3, characterized in that the third lens group further comprises an aperture stop coaxially arranged between the second biconvex lens and the fourth meniscus lens.
5. An optical lens according to claim 1, wherein the first meniscus lens is cemented with a first biconvex lens, the second biconvex lens is cemented with a third meniscus lens, the third biconvex lens is cemented with a third biconcave lens, the fourth biconvex lens is cemented with a fourth biconvex lens, and the fifth meniscus lens is cemented with a fifth biconvex lens.
6. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
5.04≤L/(ft/fw)2≤10；
wherein:
l represents the total optical length of the optical lens;
fwrepresenting the focal length of the optical lens in the shortest focus state;
ftindicating the focal length of the optical lens in the longest focal state.
7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.35<f4/ft<0.67；
wherein:
f4denotes a focal length of the fourth lens group.
8. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
4.71<Nn/(ft/fw)<7.85；
wherein:
Nnthe average refractive index of the glass material of the second biconvex lens, the fourth meniscus lens and the third biconvex lens having positive refractive power in the third lens group is shown.
9. An optical lens according to claim 1, characterized in that the abbe number of the fifth biconvex lens is greater than 80 and the refractive index is less than 1.5.
10. An optical lens according to claim 9, characterized in that the parameters of each optical lens satisfy, in order:
Where R1 is a curvature radius of a surface of each lens facing the object side, R2 is a curvature radius of a surface of each lens facing the image side, Tc is a center thickness of each lens, Nd is a refractive index of an optical glass material of each lens, and Vd is an abbe number of the optical glass material of each lens.
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| CN105334598A (en) * | 2015-11-03 | 2016-02-17 | 浙江大华技术股份有限公司 | Optical lens |
| CN106154524A (en) * | 2016-08-29 | 2016-11-23 | 浙江大华技术股份有限公司 | A kind of fog penetration lens and video camera |
| CN107765416A (en) * | 2017-10-26 | 2018-03-06 | 宁波永新光学股份有限公司 | A kind of micro objective |
| CN109143569A (en) * | 2017-06-16 | 2019-01-04 | 阿瓦特拉医药有限公司 | Camera object lens and endoscope for endoscope |
| CN110262023A (en) * | 2019-07-17 | 2019-09-20 | 重庆奥根科技股份有限公司 | A kind of four times of continuous vari-focus 4K high definition optical systems |
-
2015
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334598A (en) * | 2015-11-03 | 2016-02-17 | 浙江大华技术股份有限公司 | Optical lens |
| CN105334598B (en) * | 2015-11-03 | 2018-05-25 | 浙江大华技术股份有限公司 | A kind of optical lens |
| CN106154524A (en) * | 2016-08-29 | 2016-11-23 | 浙江大华技术股份有限公司 | A kind of fog penetration lens and video camera |
| CN109143569A (en) * | 2017-06-16 | 2019-01-04 | 阿瓦特拉医药有限公司 | Camera object lens and endoscope for endoscope |
| CN107765416A (en) * | 2017-10-26 | 2018-03-06 | 宁波永新光学股份有限公司 | A kind of micro objective |
| CN110262023A (en) * | 2019-07-17 | 2019-09-20 | 重庆奥根科技股份有限公司 | A kind of four times of continuous vari-focus 4K high definition optical systems |
| CN110262023B (en) * | 2019-07-17 | 2022-03-22 | 成都优视光电技术有限公司 | Quadruple continuous zooming 4K high-definition optical system |
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