CN111399177A - High-resolution zoom lens - Google Patents
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- CN111399177A CN111399177A CN202010333416.0A CN202010333416A CN111399177A CN 111399177 A CN111399177 A CN 111399177A CN 202010333416 A CN202010333416 A CN 202010333416A CN 111399177 A CN111399177 A CN 111399177A
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- 238000003384 imaging method Methods 0.000 claims description 9
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- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 description 10
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- 230000004075 alteration Effects 0.000 description 5
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
Abstract
The invention relates to the technical field of lenses. The invention discloses a high-resolution zoom lens which is provided with eleven lenses, wherein a focusing lens group is formed by a first lens, a second lens, a third lens, a fourth lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein a diaphragm is arranged between the focusing lens group and the variable power lens group and correspondingly limits the refractive indexes and the surface shapes of the first lens, the fourth lens and the fourth lens, the fourth lens adopts an aspheric lens, the zoom lens is provided with at least 3 groups of cemented lenses, and the cemented lenses. The invention has large light transmission; high resolution; a large image plane; the day and night confocality is good; the advantages of small size and portability.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to a high-resolution zoom lens.
Background
With the continuous progress of science and technology and the continuous development of society, in recent years, the optical imaging lens has also been rapidly developed, and the optical imaging lens is widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring, unmanned aerial vehicle aerial photography and the like.
The zoom lens is a camera lens which can change focal length in a certain range, thereby obtaining different field angles, images with different sizes and different scene ranges. The zoom lens can change a photographing range by varying a focal length without changing a photographing distance, and thus is very convenient to use and is increasingly widely used.
However, the zoom lens for security monitoring in the current market has many defects, such as small light transmission, general FNO value of 1.6-2.8, and incapability of meeting low-light requirement, and especially in a low-light environment, a monitoring picture is dark, and video noise is more; if large light transmission is required, the resolution is difficult to improve, the image quality is poor, and high-definition image quality is difficult to realize simultaneously by different focal length sections; the image surface is small, and the sensor with large image surface and high pixels cannot be adapted; the size is large, the lens is large in size and heavy, the requirements of users which are increasing cannot be met, and the improvement is needed.
Disclosure of Invention
The present invention is directed to a high-resolution zoom lens to solve the above-mentioned problems.
In order to achieve the purpose, the invention adopts the technical scheme that: a high-resolution zoom lens sequentially comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a tenth lens, a ninth lens, a tenth lens, a eleventh lens and a seventh lens from an object side to an image side along an optical axis; the first lens element to the eleventh lens element each include an object-side surface facing the object side and passing the imaging light, and an image-side surface facing the image side and passing the imaging light;
the first lens element with negative refractive index has a concave image-side surface; the second lens element with negative refractive index has a concave object-side surface and a concave image-side surface; the third lens element has positive refractive index, and the object-side surface of the third lens element is convex; the first lens to the third lens form a focusing lens group;
the fourth lens element with positive refractive index has a convex object-side surface and a convex image-side surface; the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface; the sixth lens element with negative refractive index has a concave object-side surface and a concave image-side surface; the seventh lens element with negative refractive index has a concave image-side surface; the eighth lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the ninth lens element with negative refractive index has a concave object-side surface and a convex image-side surface; the tenth lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the eleventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the fourth lens to the eleventh lens form a variable power lens group;
the object side surface and the image side surface of the fourth lens are both aspheric surfaces, the zoom lens is provided with at least 3 groups of cemented lenses, each cemented lens is formed by mutually cementing two lenses from the first lens to the eleventh lens, and the zoom lens only comprises the first lens to the eleventh lens.
Further, the zoom lens further satisfies: 0.8 < | F1/F2 | < 1.2, wherein F1 is the focal length of the focusing lens assembly, and F2 is the focal length of the zooming lens assembly.
Further, the zoom lens further satisfies: 0.8 < | f2/f3 | < 1.2, f2 is the focal length of the second lens element, and f3 is the focal length of the third lens element.
Further, the zoom lens further satisfies: 0.8 < | f6/f10 | < 1.2, wherein f6 is the focal length of the sixth lens element, and f10 is the focal length of the tenth lens element.
Further, the zoom lens further satisfies: nd1 > 1.8, where nd1 is the refractive index of the first lens.
Further, the second lens and the third lens are cemented with each other, the fifth lens and the sixth lens are cemented with each other, the eighth lens and the ninth lens are cemented with each other, and the tenth lens and the eleventh lens are cemented with each other.
Furthermore, the zoom lens further satisfies: | vd5-vd6 | 30, where vd5 is the Abbe number of the fifth lens and vd6 is the Abbe number of the sixth lens.
Further, the zoom lens further satisfies: | vd10-vd11 | 30, where vd10 is the Abbe number of the tenth lens and vd11 is the Abbe number of the eleventh lens.
Further, the first lens to the eleventh lens are made of glass materials.
The invention has the beneficial technical effects that:
the invention has the advantages of large light transmission, great improvement of the light inlet quantity of the lens, good low-light effect and more bright and clean picture; the transfer function is well controlled, high in resolution and high in resolution; the optical system has good manufacturability and low sensitivity, so that the actual finished product is closer to the design; the image surface is large and can support the image height of 9.5 mm; the focal length section has large span and flexible switching of far and near monitoring; the dual-purpose of day and night can be realized, and the infrared confocal property is good; the monitoring camera has the advantages of being small and exquisite, light in weight and capable of greatly reducing the occupied space of the monitoring camera.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention at a shortest focal length;
fig. 2 is a schematic structural diagram of the first embodiment of the present invention at the longest focal length;
FIG. 3 is a graph of MTF of 0.435-0.656 μm at the shortest focal length according to the first embodiment of the present invention;
FIG. 4 is a graph of MTF of 0.435-0.656 μm at the intermediate focal length according to the first embodiment of the present invention;
FIG. 5 is a graph of the MTF of 0.435-0.656 μm at the longest focal length according to the first embodiment of the present invention;
FIG. 6 is a defocus plot of 0.440-0.656 μm visible light at 60lp/mm in the first embodiment of the present invention;
FIG. 7 is a defocus graph of 60lp/mm at 0.850 μm in the infrared of the first embodiment of the present invention;
FIG. 8 is a graph of MTF of 0.435-0.656 μm at the shortest focal length according to the second embodiment of the present invention;
FIG. 9 is a graph of MTF of 0.435-0.656 μm at intermediate focus for example two of the present invention;
FIG. 10 is a graph of MTF of 0.435-0.656 μm at the longest focal length for example two of the present invention;
FIG. 11 is a defocus plot of 60lp/mm in visible light of 0.440-0.656 μm in example two of the present invention;
FIG. 12 is a defocus graph of 60lp/mm at 0.850 μm in the infrared of example two of the present invention;
FIG. 13 is a graph of MTF of 0.435-0.656 μm at the shortest focal length according to the third embodiment of the present invention;
FIG. 14 is a graph of MTF of 0.435-0.656 μm at intermediate focus for example three of the present invention;
FIG. 15 is a graph of MTF of 0.435-0.656 μm at the longest focal length for example three of the present invention;
FIG. 16 is a defocus plot of 60lp/mm in visible light of 0.440-0.656 μm in example III of the present invention;
FIG. 17 is a defocus graph of 60lp/mm at 0.850 μm in the infrared of the third embodiment of the present invention;
FIG. 18 is a graph of MTF of 0.435-0.656 μm at the shortest focal length according to example four of the present invention;
FIG. 19 is a graph of the MTF of 0.435-0.656 μm at the intermediate focal length for example four of the present invention;
FIG. 20 is a graph of the MTF of 0.435-0.656 μm at the longest focal length for example four of the present invention;
FIG. 21 is a defocus plot of 60lp/mm in visible light of 0.440-0.656 μm in example four of the present invention;
FIG. 22 is a defocus graph of 60lp/mm at 0.850 μm in the infrared of example four.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
The term "a lens element having positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The invention provides a high-resolution zoom lens which sequentially comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a; the first lens element to the eleventh lens element each include an object-side surface facing the object side and passing the image light, and an image-side surface facing the image side and passing the image light.
The first lens element with negative refractive index has a concave image-side surface; the second lens element with negative refractive index has a concave object-side surface and a concave image-side surface; the third lens element has positive refractive index, and the object-side surface of the third lens element is convex; the first lens to the third lens form a focusing lens group which can move relatively relative to the diaphragm on the optical axis to play a role in refocusing.
The fourth lens element with positive refractive index has a convex object-side surface and a convex image-side surface; the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface; the sixth lens element with negative refractive index has a concave object-side surface and a concave image-side surface; the seventh lens element with negative refractive index has a concave image-side surface; the eighth lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the ninth lens element with negative refractive index has a concave object-side surface and a convex image-side surface; the tenth lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the eleventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the fourth lens to the eleventh lens constitute a variable power lens group which is movable relative to the stop on the optical axis and performs a function of changing focal length and power.
The object side surface and the image side surface of the fourth lens are both aspheric surfaces, the image quality is optimized, the aberration is corrected, the total length of the optical system is controlled, the zoom lens is provided with at least 3 groups of cemented lenses, the cemented lenses are formed by mutually cementing two lenses from the first lens to the eleventh lens, the total length of the optical system can be effectively controlled while the chromatic aberration is optimized, the miniaturization is realized, and the lenses with the refractive index of the zoom lens are only the first lens to the eleventh lens.
The invention has the advantages of large light transmission, great improvement of the light inlet quantity of the lens, good low-light effect and more bright and clean picture; the transfer function is well controlled, high in resolution and high in resolution; the optical system has good manufacturability and low sensitivity, so that the actual finished product is closer to the design; the image surface is large and can support the image height of 9.5 mm; the focal length section has large span and flexible switching of far and near monitoring; the dual-purpose of day and night can be realized, and the infrared confocal property is good; the monitoring camera has the advantages of being small and exquisite, light in weight and capable of greatly reducing the occupied space of the monitoring camera.
Preferably, the zoom lens further satisfies: 0.8 < | F1/F2 | < 1.2, wherein F1 is the focal length of the focusing lens group, and F2 is the focal length of the zoom lens group, so that the system can obtain a better performance, namely, a large image plane and high image quality.
Preferably, the zoom lens further satisfies: 0.8 < | f2/f3 | < 1.2, f2 is the focal length of the second lens, f3 is the focal length of the third lens, balance the focal power, reduce the low sensitivity, obtain the high resolution.
Preferably, the zoom lens further satisfies: 0.8 < | f6/f10 | < 1.2, wherein f6 is the focal length of the sixth lens element, f10 is the focal length of the tenth lens element, and the reasonable focal lengths are matched, so that large light transmission is further realized, and high image quality is kept.
Preferably, the zoom lens further satisfies: nd1 is more than 1.8, wherein nd1 is the refractive index of the first lens, which is beneficial to reducing the outer diameter of the lens and realizing the miniaturization of the system.
Preferably, the second lens and the third lens are mutually cemented, the fifth lens and the sixth lens are mutually cemented, the eighth lens and the ninth lens are mutually cemented, and the tenth lens and the eleventh lens are mutually cemented, so that the total length of the optical system can be effectively controlled while further optimizing chromatic aberration, and miniaturization is realized.
More preferably, the zoom lens further satisfies: | vd5-vd6 | > 30, wherein vd5 is the abbe number of the fifth lens, vd6 is the abbe number of the sixth lens, and high-low dispersion materials are combined to further correct chromatic aberration and optimize day and night confocality.
Preferably, the zoom lens further satisfies: | vd10-vd11 | > 30, wherein vd10 is the abbe number of the tenth lens, vd11 is the abbe number of the eleventh lens, and high-low dispersion materials are combined to further correct chromatic aberration and optimize day and night confocality.
Preferably, the first lens to the eleventh lens are made of glass materials, and the optical performance of the zoom lens is further improved.
The high-resolution zoom lens of the present invention will be described in detail below with specific embodiments.
Example one
As shown in fig. 1 and 2, the present invention provides a high resolution zoom lens, which comprises, in order along an optical axis I from an object side a1 to an image side a2, a first lens 1, a second lens 2, a third lens 3, a stop 120, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 100, an eleventh lens 110, a protective glass 130, and an image plane 140; the first lens element 1 to the eleventh lens element 110 each include an object-side surface facing the object side a1 and passing the image light, and an image-side surface facing the image side a2 and passing the image light.
The first lens element 1 has a negative refractive index, the object-side surface 11 of the first lens element 1 is a convex surface, and the image-side surface 12 of the first lens element 1 is a concave surface; the second lens element 2 has a negative refractive index, the object-side surface 21 of the second lens element 2 is concave, and the image-side surface 22 of the second lens element 2 is concave; the third lens element 3 has a positive refractive index, the object-side surface 31 of the third lens element 3 is convex, and the image-side surface 32 of the third lens element 3 is concave; the first lens 1 to the third lens 3 constitute a focusing lens group, and are relatively movable on the optical axis I with respect to the stop 120, and perform a refocusing function.
The fourth lens element 4 has a positive refractive index, the object-side surface 41 of the fourth lens element 4 is a convex surface, and the image-side surface 42 of the fourth lens element 4 is a convex surface; the fifth lens element 5 has a positive refractive index, the object-side surface 51 of the fifth lens element 5 is convex, and the image-side surface 52 of the fifth lens element 5 is convex; the sixth lens element 6 has a negative refractive index, the object-side surface 61 of the sixth lens element 6 is concave, and the image-side surface 62 of the sixth lens element 6 is concave; the seventh lens element 7 has a negative refractive index, the object-side surface 71 of the seventh lens element 7 is a flat surface, and the image-side surface 72 of the seventh lens element 7 is a concave surface; the eighth lens element 8 has a positive refractive index, the object-side surface 81 of the eighth lens element 8 is a convex surface, and the image-side surface 82 of the eighth lens element 8 is a convex surface; the ninth lens element 9 with negative refractive index has a concave object-side surface 91 and a convex image-side surface 92 of the ninth lens element 9; the tenth lens element 100 with positive refractive power has a convex object-side surface 101 of the tenth lens element 100 and a convex image-side surface 102 of the tenth lens element 100; the eleventh lens element 110 has a negative refractive index, the object-side surface 111 of the eleventh lens element 110 is concave, and the image-side surface 112 of the eleventh lens element 110 is concave; the fourth lens 4 to the eleventh lens 110 constitute a variable power lens group, and are relatively movable on the optical axis I with respect to the stop 120, and function to perform zooming and magnification-varying.
The object-side surface 41 and the image-side surface 42 of the fourth lens element 4 are both aspheric.
In this embodiment, the second lens 2 and the third lens 3 are cemented with each other, the fifth lens 5 and the sixth lens 6 are cemented with each other, the eighth lens 8 and the ninth lens 9 are cemented with each other, and the tenth lens 100 and the eleventh lens 110 are cemented with each other, but the invention is not limited thereto.
In the present embodiment, the first lens 1 to the eleventh lens 110 are made of a glass material, but not limited thereto.
Of course, in other embodiments, the object-side surface 11 of the first lens element 1 may be a concave surface or a flat surface, the image-side surface 32 of the third lens element 3 may be a flat surface or a convex surface, and the object-side surface 71 of the seventh lens element 7 may be a convex surface or a concave surface.
Detailed optical data at the shortest focal length of this embodiment are shown in table 1-1.
TABLE 1-1 detailed optical data at shortest focal length of example one
In this embodiment, the object-side surface 41 and the image-side surface 42 are defined by the following aspheric curve formula:
wherein:
z: depth of the aspheric surface (the vertical distance between a point on the aspheric surface that is y from the optical axis and a tangent plane tangent to the vertex on the optical axis of the aspheric surface);
c: curvature of aspheric vertex (the vertex curvature);
k: cone coefficient (Conic Constant);
rn: chinese angelica root-barkNormalized Radius (NRADIUS);
u：r/rn；
am: mth order QconCoefficient (is the m)thQconcoefficient)；
Qm con: mth order QconPolynomial (the m)thQconpolynomial)；
For details of parameters of each aspheric surface, please refer to the following table:
| surface of | K＝ | a4＝ | a6＝ | a8＝ | a10＝ | a12＝ |
| 41 | -2.666 | -6.06E-05 | -2.13E-06 | -7.87E-09 | -6.87E-10 | -3.34E-12 |
| 42 | 1.288 | -1.80E-05 | -1.68E-06 | -4.00E-09 | -5.01E-10 | -1.47E-12 |
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
Referring to fig. 3 to 5, the MTF graphs of the present embodiment show that the transfer function is well controlled and the resolution is high, and the resolutions of the short focus, the middle focus and the long focus can reach 200 lp/mm; the defocusing graphs refer to fig. 6-7, and it can be seen that visible and infrared defocusing is within 10 μm, which can meet the use requirement of day and night.
In this specific embodiment, the focal length f of the zoom lens is 4-10mm, the minimum aperture value FNO is 1.3, the field angle FOV is 150 ° -56 °, the image plane height IMH is 9.5mm, and the distance TT L between the object-side surface 11 of the first lens 1 and the imaging plane 140 on the optical axis I is 61.71mm when the focal length is the shortest.
Example two
In this embodiment, the surface convexities and concavities and refractive indexes of the lenses are substantially the same as those of the first embodiment, only the object-side surface 11 of the first lens element 1 is a concave surface, and the object-side surface 71 of the seventh lens element 7 is a convex surface, and the optical parameters such as the curvature radius of the lens surfaces and the lens thickness are different.
The detailed optical data at the shortest focal length of this embodiment is shown in table 2-1.
TABLE 2-1 detailed optical data at shortest focal Length for example two
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | K＝ | a4＝ | a6＝ | a8＝ | a10＝ | a12＝ |
| 41 | -2.53 | -5.67E-05 | -2.18E-06 | -1.05E-08 | -7.19E-10 | 7.84E-14 |
| 42 | 1.21 | -1.54E-05 | -1.85E-06 | -6.64E-09 | -4.83E-10 | 4.46E-13 |
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
Referring to fig. 8 to 10, it can be seen that the resolution of the present embodiment is good for the control of the transfer function, the resolution is high, and the resolutions of the short focal length, the middle focal length and the long focal length can all reach 200 lp/mm; referring to fig. 11-12, it can be seen that the visible and infrared defocusing is within 10 μm, which can meet the use requirement of day and night.
In the present embodiment, the focal length f of the zoom lens is 4-10mm, the minimum aperture value FNO is 1.3, the field angle FOV is 150 ° -56 °, the image plane height IMH is 9.5mm, and the distance TT L between the object side surface 11 of the first lens 1 and the imaging plane 140 on the optical axis I is 61.49mm when the focal length is the shortest.
EXAMPLE III
In this embodiment, the surface convexities and concavities and refractive indexes of the respective lenses are substantially the same as those of the first embodiment, only the object-side surface 11 of the first lens element 1 is a flat surface, the image-side surface 32 of the third lens element 3 is a flat surface, and optical parameters such as the curvature radius of the surface of each lens element and the thickness of each lens element are different.
The detailed optical data at the shortest focal length of this embodiment is shown in table 3-1.
TABLE 3-1 detailed optical data at shortest focal length for example III
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
please refer to table 5 for the values of the conditional expressions related to this embodiment.
Referring to fig. 13 to 15, it can be seen that the resolution of the present embodiment is good for the control of the transfer function, the resolution is high, and the resolutions of the short focal length, the middle focal length and the long focal length can all reach 200 lp/mm; defocus graphs referring to fig. 16-17, it can be seen that visible and infrared defocus within 10 μm can achieve the use requirement of day and night.
In this specific embodiment, the focal length f of the zoom lens is 4-10mm, the minimum aperture value FNO is 1.3, the field angle FOV is 150 ° -54 °, the image plane height IMH is 9.5mm, and the distance TT L between the object side surface 11 of the first lens 1 and the imaging plane 140 on the optical axis I is 55.23mm when the focal length is the shortest.
Example four
In this embodiment, the surface convexities and concavities and refractive indexes of the lenses are substantially the same as those of the first embodiment, only the object-side surface 11 of the first lens element 1 is a concave surface, the object-side surface 71 of the seventh lens element 7 is a convex surface, the second lens element 2 and the third lens element 3 are not cemented, and optical parameters such as the curvature radius of the surfaces of the lenses and the lens thickness are different.
The detailed optical data at the shortest focal length of this embodiment is shown in table 4-1.
TABLE 4-1 detailed optical data at shortest focal length for example four
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | K＝ | a4＝ | a6＝ | a8＝ | a10＝ | a12＝ |
| 41 | -2.51 | -6.08E-05 | -1.96E-06 | -1.50E-08 | -6.49E-10 | 1.27E-12 |
| 42 | 1.32 | -1.81E-05 | -1.77E-06 | -7.19E-09 | -4.32E-10 | 4.22E-13 |
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
Referring to fig. 18 to 20, it can be seen that the resolution of the present embodiment is good for the control of the transfer function, the resolution is high, and the resolutions of the short focal length, the middle focal length and the long focal length can all reach 200 lp/mm; the defocus graphs shown in FIGS. 21-22 show that visible and infrared defocus within 10 μm can be used for day and night.
In this specific embodiment, the focal length f of the zoom lens is 4-10mm, the minimum aperture value FNO is 1.3, the field angle FOV is 150 ° -54 °, the image plane height IMH is 9.5mm, and the distance TT L between the object side surface 11 of the first lens 1 and the imaging plane 140 on the optical axis I is 68.17mm when the focal length is the shortest.
TABLE 5 numerical tables of relational expressions for four embodiments of the present invention
| Example one | Example two | EXAMPLE III | Example four | |
| F1 | -11.4 | -11.5 | -10.9 | -10.8 |
| F2 | 12.6 | 12.5 | 11.6 | 12.4 |
| ∣F1/F2∣ | 0.90 | 0.92 | 0.94 | 0.87 |
| ∣f2/f3∣ | 0.91 | 0.93 | 0.93 | 0.89 |
| ∣f6/f10∣ | 1.11 | 1.06 | 1.02 | 1.06 |
| ∣vd5-vd6∣ | 60.67 | 60.67 | 60.76 | 60.76 |
| ∣vd10-vd11∣ | 38.86 | 38.86 | 38.86 | 38.86 |
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A high-resolution zoom lens, characterized in that: the lens assembly comprises first to third lenses, a diaphragm, and fourth to eleventh lenses in sequence from an object side to an image side along an optical axis; the first lens element to the eleventh lens element each include an object-side surface facing the object side and passing the imaging light, and an image-side surface facing the image side and passing the imaging light;
the first lens element with negative refractive index has a concave image-side surface; the second lens element with negative refractive index has a concave object-side surface and a concave image-side surface; the third lens element has positive refractive index, and the object-side surface of the third lens element is convex; the first lens to the third lens form a focusing lens group;
the fourth lens element with positive refractive index has a convex object-side surface and a convex image-side surface; the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface; the sixth lens element with negative refractive index has a concave object-side surface and a concave image-side surface; the seventh lens element with negative refractive index has a concave image-side surface; the eighth lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the ninth lens element with negative refractive index has a concave object-side surface and a convex image-side surface; the tenth lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the eleventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the fourth lens to the eleventh lens form a variable power lens group;
the object side surface and the image side surface of the fourth lens are both aspheric surfaces, the zoom lens is provided with at least 3 groups of cemented lenses, each cemented lens is formed by mutually cementing two lenses from the first lens to the eleventh lens, and the zoom lens only comprises the first lens to the eleventh lens.
2. A high resolution zoom lens according to claim 1, further satisfying: 0.8 < | F1/F2 | < 1.2, wherein F1 is the focal length of the focusing lens assembly, and F2 is the focal length of the zooming lens assembly.
3. A high resolution zoom lens according to claim 1, further satisfying: 0.8 < | f2/f3 | < 1.2, f2 is the focal length of the second lens element, and f3 is the focal length of the third lens element.
4. A high resolution zoom lens according to claim 1, further satisfying: 0.8 < | f6/f10 | < 1.2, wherein f6 is the focal length of the sixth lens element, and f10 is the focal length of the tenth lens element.
5. A high resolution zoom lens according to claim 1, further satisfying: nd1 > 1.8, where nd1 is the refractive index of the first lens.
6. The high-resolution zoom lens according to claim 1, wherein: the second lens and the third lens are mutually cemented, the fifth lens and the sixth lens are mutually cemented, the eighth lens and the ninth lens are mutually cemented, and the tenth lens and the eleventh lens are mutually cemented.
7. The high resolution zoom lens according to claim 6, further satisfying: | vd5-vd6 | 30, where vd5 is the Abbe number of the fifth lens and vd6 is the Abbe number of the sixth lens.
8. The high resolution zoom lens according to claim 6, further satisfying: | vd10-vd11 | 30, where vd10 is the Abbe number of the tenth lens and vd11 is the Abbe number of the eleventh lens.
9. The high-resolution zoom lens according to claim 1, wherein: the first lens to the eleventh lens are made of glass materials.
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| CN202010333416.0A CN111399177A (en) | 2020-04-24 | 2020-04-24 | High-resolution zoom lens |
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| CN202010333416.0A CN111399177A (en) | 2020-04-24 | 2020-04-24 | High-resolution zoom lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20140376111A1 (en) * | 2013-06-20 | 2014-12-25 | Ability Opto-Electronics Technology Co., Ltd. | Wide-angle imaging lens assembly with three lenses |
| US20180074291A1 (en) * | 2016-09-13 | 2018-03-15 | Ability Opto-Electronics Technology Co.Ltd. | Optical Image Capturing System |
| CN110082894A (en) * | 2019-05-07 | 2019-08-02 | 厦门力鼎光电股份有限公司 | A kind of zoom lens |
| CN110308541A (en) * | 2019-08-06 | 2019-10-08 | 厦门力鼎光电股份有限公司 | A kind of optical imaging lens |
| CN211826695U (en) * | 2020-04-24 | 2020-10-30 | 厦门力鼎光电股份有限公司 | High-resolution zoom lens |
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2020
- 2020-04-24 CN CN202010333416.0A patent/CN111399177A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140376111A1 (en) * | 2013-06-20 | 2014-12-25 | Ability Opto-Electronics Technology Co., Ltd. | Wide-angle imaging lens assembly with three lenses |
| US20180074291A1 (en) * | 2016-09-13 | 2018-03-15 | Ability Opto-Electronics Technology Co.Ltd. | Optical Image Capturing System |
| CN110082894A (en) * | 2019-05-07 | 2019-08-02 | 厦门力鼎光电股份有限公司 | A kind of zoom lens |
| CN110308541A (en) * | 2019-08-06 | 2019-10-08 | 厦门力鼎光电股份有限公司 | A kind of optical imaging lens |
| CN211826695U (en) * | 2020-04-24 | 2020-10-30 | 厦门力鼎光电股份有限公司 | High-resolution zoom lens |
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