CN109324389B - Wide-angle photographic lens - Google Patents
Wide-angle photographic lens Download PDFInfo
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- CN109324389B CN109324389B CN201811288489.1A CN201811288489A CN109324389B CN 109324389 B CN109324389 B CN 109324389B CN 201811288489 A CN201811288489 A CN 201811288489A CN 109324389 B CN109324389 B CN 109324389B
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- 239000006185 dispersion Substances 0.000 claims abstract description 11
- 230000004075 alteration Effects 0.000 abstract description 12
- 230000003287 optical effect Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005457 optimization Methods 0.000 abstract description 5
- 238000003384 imaging method Methods 0.000 abstract description 2
- 230000001629 suppression Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
Classifications
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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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a wide-angle photographic lens, which relates to the technical field of lenses, wherein 14 lenses with 10 groups of different refractive indexes and/or different dispersion values are sequentially arranged from an object plane to an image plane, the wide-angle photographic lens comprises a front group lens group, a middle group lens group and a rear group lens group, the lens meets tan theta f & gt 10, wherein theta is a half field angle, and f is a lens focal length; the lens pixel reaches 8K, and the lens with different dispersion values is used, so that the off-axis chromatic aberration and on-axis chromatic aberration of the lens can be suppressed to a small range through the matching and optimization of the thickness, the lens gap and the surface curvature, and the larger the mutual difference of the dispersion values of the lens is, the better the suppression effect is; in addition, lenses with different refractive indexes are used, and the spherical aberration astigmatic field area of the lens is reduced to a small value through the matching and optimization of the thickness, the lens gap and the surface curvature, so that the effect of low distortion can be achieved through the selection of different optical structures; the lower the optical error, the better the resolution and imaging effect of the corresponding lens.
Description
Technical Field
The invention relates to the technical field of lenses, in particular to a wide-angle photographic lens.
Background
At present, the lens contacted with the intelligent shooting and monitoring system in the market is mainly a megapixel lens, the highest pixel can only reach 4K and 1200M pixels, the intelligent shooting and monitoring system lens with the resolution capability exceeding 4K is fresh, and meanwhile, the large-image-plane intelligent shooting and monitoring system is complex in structure and high in price and is not suitable for common user groups.
Disclosure of Invention
The invention provides a wide-angle photographic lens aiming at the problems of the background technology, which reduces optical aberration such as astigmatic field curvature distortion to a small level by arranging lenses with different high and low refractive indexes, and simultaneously reduces on-axis and off-axis chromatic dispersion of the lens by using different low-dispersion glass, thereby achieving the effect of ultrahigh resolution.
In order to achieve the above objective, the present invention provides a wide-angle photographic lens, which sequentially comprises a front group lens group, a middle group lens group and a rear group lens group from an object plane to an image plane, wherein the lens satisfies tan θ×f >10, θ is a half field angle, and f is a lens focal length.
Preferably, the lens arrangement comprises 14 10 lenses.
Preferably, the front group lens group sequentially comprises: a1 st lens with negative diopter, a 2 nd lens with negative diopter, a 3 rd lens with positive diopter, a 4 th lens with negative diopter and a 5 th lens with positive diopter.
Preferably, the middle group lens group is provided with: lens 6 with negative diopter.
Preferably, the rear group lens group sequentially comprises: a 7 th lens with negative diopter, a 8 th lens with positive diopter, a 9 th lens with positive diopter, a 10 th lens with negative diopter, a 11 th lens with positive diopter, a 12 th lens with negative diopter, a 13 th lens with positive diopter and a 14 th lens with negative diopter.
Preferably, in the front group lens group, under the condition that the equivalent focal length of the whole lens is 100mm, the focal length F1 meets-550 mm < F1< -350mm, and the total thickness meets 320mm < T1<450mm.
Preferably, in the middle group lens group, the focal length F2 satisfies |f2| >2000mm when the equivalent focal length of the whole lens is 100 mm.
Preferably, in the rear group lens group, under the condition that the equivalent focal length of the whole lens is 100mm, the focal length F3 meets 200mm < F3<350mm, and the total thickness meets 450mm < T3<700mm.
Preferably, in the case of an overall lens equivalent focal length of 100mm, the diaphragm of the lens is located in the middle group lens group, and the lens mirror surface distance T4 from the lens close to the object plane satisfies 150mm < T4<250mm.
Preferably, the total length T of the lens satisfies 1000mm < T <1400mm with an overall lens equivalent focal length of 100 mm.
The invention provides a wide-angle photographic lens, wherein the pixels reach 8K, lenses with different dispersion values are used, and through the matching and optimization of the thickness, the lens clearance and the surface curvature, the off-axis chromatic aberration and the on-axis chromatic aberration of the lens can be suppressed to a small range, and the larger the mutual difference of the dispersion values of the lenses is, the better the suppression effect is; in addition, lenses with different refractive indexes are used, and the spherical aberration astigmatic field area of the lens is reduced to a small value through the matching and optimization of the thickness, the lens gap and the surface curvature, so that the effect of low distortion can be achieved through the selection of different optical structures; the lower the optical error, the better the resolution and imaging effect of the corresponding lens.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a wide-angle lens assembly according to a first embodiment of the present invention;
FIG. 2 is a diagram illustrating a mirror structure of a wide-angle lens according to a second embodiment of the present invention;
FIG. 3 is a diagram showing the relationship between MTF modulation transfer function and spatial resolution in a third embodiment of the present invention;
FIG. 4 is a diagram showing the relationship between half field of view and field curvature range and between half field of view and distortion values in a third embodiment of the present invention, wherein FIG. (a) is a diagram showing the relationship between half field of view and field curvature range and FIG. (b) is a diagram showing the relationship between half field of view and distortion values;
Description of the reference numerals:
1-a front group lens group; 2-a middle group lens group; 3-a rear group lens group; S1-S24 represent mirror surfaces;
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides a wide-angle photographic lens, which realizes 8K resolution and large image plane;
In a first preferred embodiment of the present invention, as shown in fig. 1, the lens is sequentially provided with 14 lenses with 10 groups of different refractive indexes and different dispersion values from an object plane to an image plane, and the lenses comprise a front group lens group 1, a middle group lens group 2 and a rear group lens group 3, wherein the lens satisfies tan θ×f >10, θ is a half field angle, and f is a lens focal length.
In the embodiment of the present invention, as shown in fig. 1, the front lens group is sequentially configured from an object plane to an image plane: a 1 st lens with negative diopter, a 2 nd lens with negative diopter, a 3 rd lens with positive diopter, a 4 th lens with negative diopter and a 5 th lens with positive diopter; the middle group lens group is provided with: a 6 th lens with negative diopter; the rear group lens group is sequentially provided with: the invention provides a lens system comprising a 7 th lens with negative diopter, a 8 th lens with positive diopter, a 9 th lens with positive diopter, a 10 th lens with negative diopter, a 11 th lens with positive diopter, a 12 th lens with negative diopter, a 13 th lens with positive diopter and a 14 th lens with negative diopter, wherein any number of lenses can be inserted between the lenses in the embodiment of the invention.
In the embodiment of the invention, the optical aberration such as astigmatic field distortion is reduced to a small level by lenses, structures and arrangements with different high and low refractive indexes, and simultaneously, the on-axis and off-axis chromatic dispersion of the lens is reduced by using different low-dispersion glass, so that the effect of ultra-high resolution is achieved;
In a second preferred embodiment of the present invention, further defined on the basis of the first preferred embodiment, as shown in fig. 2, the whole system is normalized to a focal length of 100mm (i.e. the system is scaled to a focal length of 100 mm): the front group lens group (namely an optical system consisting of mirror surfaces S1S 2S 3S 4S 5S 6S 7S 8S 9S 10), the focal length F1 meets-550 mm < F1< -350mm, and the total thickness meets 320mm < T1<450mm; the focal length F2 of the middle group lens group (namely an optical system consisting of mirror surfaces S11S 12) meets |F2| >2000mm; the focal length F3 of the rear group lens group (namely an optical system consisting of mirror surfaces S13-S24) meets 200mm < F3<350mm, and the total thickness meets 450mm < T3<700mm; the diaphragm of the lens is positioned in the middle group lens group, and the distance T4 between the diaphragm and the S13 mirror surface meets 150mm < T4<250mm; the total length T of the lens meets 1000mm < T <1400mm;
In a third preferred embodiment of the present invention, further defined on the basis of the second preferred embodiment, as shown in fig. 2, the parameters of the optical system normalize the focal length by 100mm, as shown in table 1;
TABLE 1
| Surface serial number | Radius of curvature | Refractive index/Abbe number | Surface spacing | Coefficient of taper |
| S1 | 1056 | 1.806/41.0 | 30.1 | |
| S2 | 205 | — | — | |
| S3 | -2500 | 1.673/32.2 | 21.5 | |
| S4 | 210 | — | — | |
| S5 | -209 | 1.834/37.2 | 67 | |
| S6 | -195 | — | — | |
| S7 | -200 | 1.740/28.3 | 32 | |
| S8 | -305 | — | — | |
| S9 | 865 | 1.740/28.3 | 63 | |
| S10 | -1210 | — | — | |
| S11 | 580 | 1.618/63.4 | 62 | |
| S12 | 550 | — | — | |
| S13 | 730 | 1.850/32.3 | 20 | |
| S14 | 200 | 1.678/55.5 | 55 | |
| S15 | -1540 | — | — | |
| S16 | 200 | 1.697/56.2 | 100 | |
| S17 | -500 | — | — | |
| S18 | -280 | 1.762/26.6 | 14 | |
| S19 | 200 | 1.755/52.3 | 50 | |
| S20 | -450 | — | — | |
| S21 | 250 | 1.762/26.6 | 15 | |
| S22 | 130 | 1.589/61.6 | 80 | |
| S23 | -135 | 1.762/26.6 | 15 | |
| S24 | -500 | — | — | |
| IMG | Infinity is provided | — | — |
In the embodiment of the invention, the off-axis chromatic aberration and on-axis chromatic aberration of the system are suppressed to a small range and the spherical aberration coma aberration field area of the system is reduced to a small value through the matching and optimization of the thickness, the lens gap and the surface curvature.
In the embodiment of the invention, as shown in fig. 3, the ordinate is the MTF modulation transfer function, the abscissa is the spatial resolution, and the abscissa 200 corresponds to the physical resolution of 8k CMOS, and the lens of the embodiment of the invention satisfies that the MTF modulation transfer function is greater than 0.3 on the physical resolution of the CMOS, that is, the resolution requirement of the CMOS is achieved.
In the embodiment of the invention, as shown in fig. 4, the graph (a) is a field curve, the ordinate is a half field, the abscissa is a field curve range, and the field curve of the system in the whole field range is within 0-0.03 mm; as in fig. 4, the graph (b) shows distortion, the ordinate shows half field of view, the abscissa shows distortion value, and the maximum value of distortion with field of view is less than 30%.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (5)
1. A wide-angle photographic lens is characterized in that a plurality of lenses with different refractive indexes and/or different dispersion values are sequentially arranged from an object plane to an image plane, the lens comprises a front group lens group, a middle group lens group and a rear group lens group, and the lens meets the following requirementsWherein θ is the half field angle, and f is the lens focal length;
The front group lens group is sequentially provided with: a1 st lens with negative diopter, a2 nd lens with negative diopter, a3 rd lens with positive diopter, a 4 th lens with negative diopter and a 5 th lens with positive diopter; under the condition that the equivalent focal length of the whole lens is 100mm, the focal length F1 of the front group lens group meets-550 mm < F1< -350mm, and the total thickness of the front group lens group meets 320mm < T1<450mm;
The 1 st lens comprises a first mirror surface S1 and a second mirror surface S2, wherein the curvature radius of the first mirror surface S1 is 1056mm, the curvature radius of the second mirror surface S2 is 205mm, and the surface interval between the first mirror surface S1 and the second mirror surface S2 is 30.1mm; the 2 nd lens comprises a third mirror surface S3 and a fourth mirror surface S4, wherein the curvature radius of the third mirror surface S3 is 2500mm, the curvature radius of the fourth mirror surface S4 is 210mm, and the surface interval between the third mirror surface S3 and the fourth mirror surface S4 is 21.5mm; the 3 rd lens comprises a fifth mirror surface S5 and a sixth mirror surface S6, wherein the curvature radius of the fifth mirror surface S5 is-209 mm, the curvature radius of the sixth mirror surface S6 is-195 mm, and the surface interval between the fifth mirror surface S5 and the sixth mirror surface S6 is 67mm; the 4 th lens comprises a seventh mirror surface S7 and an eighth mirror surface S8, wherein the curvature radius of the seventh mirror surface S7 is-200 mm, the curvature radius of the eighth mirror surface S8 is-305 mm, and the surface interval between the seventh mirror surface S7 and the eighth mirror surface S8 is 32mm; the 5 th lens comprises a ninth mirror surface S9 and a tenth mirror surface S10, wherein the curvature radius of the ninth mirror surface S9 is 865, the curvature radius of the tenth mirror surface 10 is-1210, and the surface interval between the ninth mirror surface S9 and the tenth mirror surface S10 is 63;
the lens arrangement comprises 14 lenses with 10 groups;
The middle group lens group is provided with: a 6 th lens with negative diopter;
The rear group lens group is sequentially provided with: a 7 th lens with negative diopter, a 8 th lens with positive diopter, a 9 th lens with positive diopter, a 10 th lens with negative diopter, a 11 th lens with positive diopter, a 12 th lens with negative diopter, a 13 th lens with positive diopter and a 14 th lens with negative diopter.
2. The wide-angle photographic lens of claim 1, wherein the group of lenses in the middle group has a focal length F2 satisfying |f2| >2000mm with an overall lens equivalent focal length of 100 mm.
3. The wide-angle photographic lens of claim 1, wherein the rear group lens group has a focal length F3 satisfying 200mm < F3<350mm and a total thickness satisfying 450mm < t3<700mm with an overall lens equivalent focal length of 100mm.
4. The wide-angle photographic lens as claimed in claim 1, wherein the diaphragm of the lens is located in the middle group lens group at an equivalent focal length of 100mm of the whole lens, and a lens mirror surface distance T4 from the lens near the object plane satisfies 150mm < T4<250mm.
5. The wide-angle photographic lens as claimed in claim 1, wherein the total length T of the lens satisfies 1000mm < T <1400mm with an overall lens equivalent focal length of 100 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811288489.1A CN109324389B (en) | 2018-10-31 | 2018-10-31 | Wide-angle photographic lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811288489.1A CN109324389B (en) | 2018-10-31 | 2018-10-31 | Wide-angle photographic lens |
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| CN109324389A CN109324389A (en) | 2019-02-12 |
| CN109324389B true CN109324389B (en) | 2024-06-18 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519663A (en) * | 2018-03-09 | 2018-09-11 | 浙江大华技术股份有限公司 | A kind of zoom lens |
| CN209148944U (en) * | 2018-10-31 | 2019-07-23 | 广州博冠光电科技股份有限公司 | A kind of wide-angle photographic lens |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6870687B2 (en) * | 2001-12-12 | 2005-03-22 | Nikon Corporation | Optical system with wavelength selecting device |
| US9753250B2 (en) * | 2014-05-26 | 2017-09-05 | Olympus Corporation | Wide angle lens and image pickup apparatus using the same |
| CN104777591B (en) * | 2015-04-08 | 2017-12-22 | 安徽长庚光学科技有限公司 | A kind of ultra-wide angle micro-lens |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519663A (en) * | 2018-03-09 | 2018-09-11 | 浙江大华技术股份有限公司 | A kind of zoom lens |
| CN209148944U (en) * | 2018-10-31 | 2019-07-23 | 广州博冠光电科技股份有限公司 | A kind of wide-angle photographic lens |
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| CN109324389A (en) | 2019-02-12 |
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