CN110618521A - Ultrathin lens of single lens reflex - Google Patents
Ultrathin lens of single lens reflex Download PDFInfo
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- CN110618521A CN110618521A CN201910937944.4A CN201910937944A CN110618521A CN 110618521 A CN110618521 A CN 110618521A CN 201910937944 A CN201910937944 A CN 201910937944A CN 110618521 A CN110618521 A CN 110618521A
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- 230000011514 reflex Effects 0.000 title claims abstract description 16
- 230000005499 meniscus Effects 0.000 claims abstract description 9
- 239000011521 glass Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims 1
- 230000003287 optical effect Effects 0.000 description 19
- 230000004075 alteration Effects 0.000 description 13
- 238000003384 imaging method Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 102220042297 rs587780883 Human genes 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 206010034960 Photophobia Diseases 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 208000013469 light sensitivity Diseases 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention relates to an ultrathin lens of a single lens reflex, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are arranged in sequence from an object side to an image side; the first lens is a biconcave lens with a negative focal length; the second lens is a meniscus lens with positive focal length, and the convex surface faces the object side; the third lens is a biconvex lens with positive focal length; the fourth lens is a biconvex lens with positive focal length; the fifth lens is a biconcave lens with a negative focal length; the sixth lens is a meniscus lens with positive focal length, and one surface facing the object side is a concave surface; the seventh lens is a biconcave lens with a negative focal length; the eighth lens is a biconvex lens with a positive focal length; the ninth lens is a biconvex lens with positive focal length; the tenth lens is a biconcave lens with a negative focal length. The lens has the advantages of ultrahigh resolution, large aperture and ultrathin thickness.
Description
Technical Field
The invention relates to an ultrathin lens of a single lens reflex, belonging to the technical field of optical imaging.
Background
In digital camera equipment, a certain gap exists in the production design of domestic lenses, and the number of photographing enthusiasts is increased along with the improvement of living standard of people, so that the demand of the aspect is increased. In the design of the existing full-width lens, such as a 35mm lens produced by manufacturers such as Nikon, Canon and horse, the maximum aperture is only F1.4, the cost performance is low, the design of domestic manufacturers generally mainly adopts a full-glass spherical surface, the aberration can not be well corrected, the using effect can be achieved only by widening the length of the lens and increasing the number of lenses, and the lens has the defects of large volume and inconvenient carrying due to overweight. Just disclose a single opposition machine super aperture wide-angle lens as patent 201610346001, its technical scheme exists the shortcoming has: the length of the lens is too long to reach 135 mm; the diameter of the lens is larger, and is generally 40-50 mm; the number of the lenses is large. Therefore, it is necessary to design an ultra-thin full-frame lens with large light flux.
Disclosure of Invention
The invention aims to provide an ultrathin lens of a single lens reflex, which has the specific scheme that:
a single lens reflex ultrathin lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are arranged in sequence from an object side to an image side; the first lens is a biconcave lens with a negative focal length; the second lens is a meniscus lens with positive focal length, and the convex surface faces the object side; the third lens is a biconvex lens with positive focal length; the fourth lens is a biconvex lens with positive focal length; the fifth lens is a biconcave lens with a negative focal length; the sixth lens is a meniscus lens with positive focal length, and one surface facing the object side is a concave surface; the seventh lens is a biconcave lens with a negative focal length; the eighth lens is a biconvex lens with a positive focal length; the ninth lens is a biconvex lens with positive focal length; the tenth lens is a biconcave lens with a negative focal length; the third lens and the sixth lens are glass aspheric lenses, and the other lenses are glass spherical lenses; the focal length of the third lens is f3, the focal length of the sixth lens is f6, the overall focal length of the lens is f, and the relation is satisfied:
1.08<(f3/f)<1.5(1)
4.5<(f6/f)<6.5(2)。
preferably, the refractive index of the material of the third lens is ND3, the refractive index of the material of the sixth lens is ND6, and the relationship is satisfied: ND3 ═ ND6> 1.85.
Preferably, the first lens and the second lens are a set of double-cemented lens, the fourth lens and the fifth lens are a set of double-cemented lens, the seventh lens and the eighth lens are a set of double-cemented lens, and the ninth lens and the tenth lens are a set of double-cemented lens.
Preferably, in the double cemented lens, the refractive index of the lens with the positive focal length is larger than 1.88, and the abbe number of the lens with the negative focal length is smaller than 35.
Preferably, a diaphragm device is arranged between the fifth lens and the sixth lens.
The invention limits the structure, focal power, arrangement sequence and the like of each lens by reasonably using the glass aspheric surface and the double-cemented lens group, effectively reduces the total length of the lens and improves the image pickup effect. The invention has the characteristics of ultrahigh resolution, large aperture and ultrathin property, and compared with the prior art, the invention has the following beneficial points:
1. the length is ultra-thin and is controlled below 70 mm.
2. The diameter of the lens is small and is controlled below 30 mm.
3. The number of lenses is small.
Drawings
FIG. 1 is a schematic view of a lens according to an embodiment of the present invention;
FIG. 2 is an exploded view of an embodiment of the present invention;
FIG. 3 is a distortion diagram of an embodiment of the present invention;
FIG. 4 is a graph of relative illuminance according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the present invention provides an optical lens, as shown in fig. 1, in order from an object side to an image side along an optical axis, comprising: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, and a tenth lens 10. The first lens 1 is a biconcave lens with a negative focal length, the second lens 2 is a meniscus lens with a positive focal length, the convex surface faces the object, the third lens 3 is a biconvex lens with a positive focal length, the fourth lens 4 is a biconvex lens with a positive focal length, the fifth lens 5 is a biconcave lens with a negative focal length, the sixth lens 6 is a meniscus lens with a positive focal length, the side of the meniscus lens facing the object side is a concave surface, the seventh lens 7 is a biconcave lens with a negative focal length, the eighth lens 8 is a biconvex lens with a positive focal length, the ninth lens 9 is a biconvex lens with a positive focal length, and the tenth lens 10 is a biconcave lens with a negative focal length. The third lens and the sixth lens are glass aspheric lenses, and the other lenses are glass spherical lenses. The third lens and the sixth lens are glass aspheric lenses, and the other lenses are glass spherical lenses. Through reasonable use glass aspheric surface and two cemented lens group, the effectual overall length that reduces the camera lens to the effect of making a video recording has been improved. The lens has the characteristics of ultrahigh resolution, large aperture and ultra-thin, and overcomes the defects in the prior art.
By adopting the structural shape of the optical lens system provided by the invention, parameters such as Abbe coefficients of optical glass materials are well matched with imaging conditions, so that spherical aberration, coma aberration, astigmatism, field curvature, chromatic aberration of magnification and position chromatic aberration of the lens system are well corrected, the use requirement of a single lens reflex camera is met, and the single lens reflex camera is small in size and convenient to carry.
In a specific implementation, as shown in fig. 1, in the optical lens assembly provided in the embodiment of the present invention, the first lens and the second lens are a set of double-cemented lens a, the fourth lens and the fifth lens are a set of double-cemented lens B, the seventh lens and the eighth lens are a set of double-cemented lens C, the ninth lens and the tenth lens are a set of double-cemented lens D, and a stop device ST is disposed between the fifth lens and the sixth lens. Because the lens with positive focal power has negative chromatic aberration, and the lens with negative focal power has positive chromatic aberration, the chromatic aberration is compensated and eliminated by forming the cemented lens group through the seamless cementing of the lens with positive focal power and the lens with negative focal power. The prime lens provided by the embodiment of the invention comprises four groups of cemented lenses, wherein each cemented lens comprises a lens with a positive focal length and a lens with a negative focal length, so that chromatic aberration mutual compensation is realized, chromatic aberration is eliminated, imaging definition is optimized, image quality of an optical system is improved, and resolution is improved.
Further, in the optical lens provided in the embodiment of the present invention, as shown in fig. 1, the refractive indexes of the positive lenses ND2, ND4, ND8, and ND9 are all greater than 1.88, and the larger the refractive index of the lenses is, the larger the light deflection angle is, the shorter the optical path length is, and the total length of the system can be effectively reduced by using a high refractive index material for the positive lenses.
Further, in the optical lens barrel according to the embodiment of the present invention, a focal length of the third lens is f3, a focal length of the sixth lens is f6, and an overall focal length of the lens barrel is f, which satisfies a relation: 1.08< (f3/f) <1.5 (1); 4.5< (f6/f) <6.5 (2).
When the value of | f3/f | exceeds the upper limit of 1.5, f3 is relatively large, namely, the focal power is relatively small, so that the optical back focus is insufficient, and the structural space is difficult to arrange parts such as an automatic switching device of the red filter; when the value of | f3/f | is below the lower limit of 6.75, f3 becomes relatively small, i.e., the power becomes relatively large, which causes an increase in high-order aberration. Therefore, the optical lens in the embodiment of the invention can realize better imaging quality and a reasonable structural space form when the condition 1.08< (f3/f) <1.5 is met.
Further, when the value of | f6/f | exceeds the upper limit of 6.5, f6 becomes relatively large, i.e., the focal power becomes relatively small, so that the optical back focus is insufficient, and the structural space is difficult to arrange components such as an automatic switching device of the red filter; when the value of | f6/f | is lower than the lower limit of 4.5, f6 becomes relatively small, i.e., the power becomes relatively large, which causes an increase in high-order aberration, so that a large number of lenses are required, making it difficult to realize an optical system with good imaging performance by a small number of lens structures. Therefore, the optical lens in the embodiment of the invention can realize better imaging quality when the condition 4.5< (f6/f) <6.5 is satisfied.
The following will be mentioned as an example of the optical lens of the present invention, the total focal length f is 35.4mm, FNO is 1.2, the field angle FOV is 64 °, the lens distortion is-2%, and the total length of the ultra-thin digital single lens reflex super-large aperture full-width lens of 65mm, and the parameters of the lens group are listed in table 1 in sequence:
TABLE 1
In table 1, surface is a surface number, Thickness is a Thickness parameter, glass name is a glass material, Index is a refractive Index, ABB is an abbe constant, Radius is a curvature Radius, and EFL-E is focal lengths f1 to f10 of the first lens to the tenth lens in this order.
In table 1, mirror numbers 1, 2, and 3 sequentially represent three mirror surfaces of the cemented lens group a in the light incidence direction, wherein 2 represents the cemented surfaces of the lens 1 and the lens 2, mirror numbers 4 and 5 represent two mirror surfaces of the lens 3 in the light incidence direction, mirror number 4 represents a mirror surface of the lens 3 facing the object, mirror number 5 represents a mirror surface of the lens 3 facing the image, mirror numbers 6, 7, and 8 sequentially represent three mirror surfaces of the cemented lens group B in the light incidence direction, wherein 7 represents the cemented surfaces of the lens 4 and the lens 5,
mirror numbers 9, 10 represent two mirror surfaces of the lens 6 in the light incidence direction, mirror number 9 represents a mirror surface of the lens 6 toward the object side, mirror number 10 represents a mirror surface of the lens 6 toward the image side, mirror numbers 11, 12, 13 represent three mirror surfaces of the cemented lens group C in the light incidence direction in order, wherein 12 represents a cemented surface of the lens 7 and the lens 8, mirror numbers 14, 15, 16 represent three mirror surfaces of the cemented lens group D in the light incidence direction in order, wherein 15 represents a cemented surface of the lens 9 and the lens 10,
in the embodiment of the invention, f3/f is 45.928366/35.4 is 1.297, and 1.08< (f3/f) <1.5 is satisfied. In the embodiment of the invention, f6/f is 196.0935/35.4 is 5.54, and 4.5< (f6/f) <6.5 is satisfied.
In the embodiment of the present invention, the third lens and the sixth lens are glass aspheric lenses, and are made of M-TAFD307, and the refractive index ND 3-ND 6-1.882023 are both made of high refractive materials, which satisfy the following relation: ND3 ═ ND6> 1.85.
In the embodiment of the invention, ND 2-1.953747, ND 4-1.883, ND 8-1.883, ND 9-1.883, which are all larger than 1.88, VD 1-33.842283, VD 5-31.160527, VD 7-28.315013, and VD 10-33.842283, which are all smaller than 35, all satisfy the requirements.
In this embodiment, the third lens element and the sixth lens element are glass aspheric lens elements, and the aspheric values thereof are listed in table 2 in sequence:
TABLE 2
| SURFACE:4 | SURFACE:5 |
| K＝-4.427041343 | K＝171119.702277300 |
| E4＝-0.000004440658146468 | E4＝-0.000009357608530060 |
| E6＝-0.000000052134992337 | E6＝-0.000000046762800032 |
| E8＝-0.000000000023607920 | E8＝-0.000000000078832522 |
| E10＝-0.000000000000641100 | E10＝-0.000000000000174200 |
| R1＝40.238326956 | R2＝5620.021630922 |
| SURFACE:9 | SURFACE:10 |
| K＝25.615371731 | K＝12.490803098 |
| E4＝-0.000033915993811870 | E4＝-0.000002343772665113 |
| E6＝-0.000000235083498050 | E6＝-0.000000159653338750 |
| E8＝0.000000000129358261 | E8＝0.000000000491574246 |
| E10＝0.000000000001967100 | E10＝0.000000000001638900 |
| R1＝-75.714027656 | R2＝-53.301652968 |
In the embodiment of the present invention, as can be calculated from table 1, the field angle 2w of the optical lens is 64 degrees, and the relative aperture is 1.2. In the embodiment of the invention, the total length of the lens is 65mm, and the structure is compact. Fig. 2 is a graph of Modulation Transfer Function (MTF) of the visible band, representing the integrated resolving power of the optical system, where the horizontal axis represents spatial frequency in units: the number of turns is per millimeter (cycles/mm), the pixel of a single lens reflex chip is large, the evaluation is carried out for 40lp/mm, the longitudinal axis represents the numerical value of a Modulation Transfer Function (MTF), the numerical value of the MTF is used for evaluating the imaging quality of a lens, the value range is 0-1, particularly, the optical transfer function is used for evaluating the imaging quality of an optical system in a more accurate, visual and common mode, the higher and smoother curve is, the better the imaging quality of the system is, and the stronger the restoring capability to a real image is; as can be seen from FIG. 2, when the spatial frequency of the visible light band is 40lp/mm, the MTF of the main field is greater than 0.2, and the digital single lens reflex super-large aperture full-frame lens has the advantages of being ultrathin, having a super-large aperture, correcting various aberrations, compact in structure, good in imaging effect and high in cost performance.
Fig. 2 is a distortion graph corresponding to the visible light part of the lens system, wherein the distortion rate is smaller as the curve is closer to the y-axis. As shown in FIG. 3, in which the optical distortion ratio is controlled within the range of-2% to 0%, no significant distortion is observed in the image. As shown in fig. 4, the single-lens reflex camera has a large pixel, good light sensitivity, and a relative illumination greater than 20%, and meets the use requirements.
Claims (5)
1. The utility model provides an ultra-thin camera lens of single opposition machine which characterized in that: the zoom lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are arranged in sequence from the object side to the image side; the first lens is a biconcave lens with a negative focal length; the second lens is a meniscus lens with positive focal length, and the convex surface faces the object side; the third lens is a biconvex lens with positive focal length; the fourth lens is a biconvex lens with positive focal length; the fifth lens is a biconcave lens with a negative focal length; the sixth lens is a meniscus lens with positive focal length, and one surface facing the object side is a concave surface; the seventh lens is a biconcave lens with a negative focal length; the eighth lens is a biconvex lens with a positive focal length; the ninth lens is a biconvex lens with positive focal length; the tenth lens is a biconcave lens with a negative focal length; the third lens and the sixth lens are glass aspheric lenses, and the other lenses are glass spherical lenses; the focal length of the third lens is f3, the focal length of the sixth lens is f6, the overall focal length of the lens is f, and the relation is satisfied:
1.08<(f3/f)<1.5 (1)
4.5<(f6/f)<6.5 (2)。
2. the ultrathin lens of a single lens reflex camera according to claim 1, characterized in that: the refractive index of the material of the third lens is ND3, the refractive index of the material of the sixth lens is ND6, and the relation is satisfied: ND3 ═ ND6> 1.85.
3. The ultrathin lens of a single lens reflex camera according to claim 1, characterized in that: the first lens and the second lens are a group of double-cemented lenses, the fourth lens and the fifth lens are a group of double-cemented lenses, the seventh lens and the eighth lens are a group of double-cemented lenses, and the ninth lens and the tenth lens are a group of double-cemented lenses.
4. The ultrathin lens of a single lens reflex camera according to claim 3, characterized in that: in the double-cemented lens, the refractive index of the lens with the positive focal length is larger than 1.88, and the dispersion coefficient of the lens with the negative focal length is smaller than 35.
5. The ultrathin lens of a single lens reflex camera according to claim 1, characterized in that: and a diaphragm device is arranged between the fifth lens and the sixth lens.
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| CN201910937944.4A CN110618521A (en) | 2019-09-30 | 2019-09-30 | Ultrathin lens of single lens reflex |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910937944.4A CN110618521A (en) | 2019-09-30 | 2019-09-30 | Ultrathin lens of single lens reflex |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112269238A (en) * | 2020-11-04 | 2021-01-26 | 中国航空工业集团公司洛阳电光设备研究所 | Day and night dual-purpose athermal lens with wide illumination range |
| CN113777750A (en) * | 2021-09-07 | 2021-12-10 | 广州长步道光学科技有限公司 | Large-caliber multi-configuration near-infrared band industrial imaging lens |
| CN115373104B (en) * | 2021-05-17 | 2024-03-12 | 东莞市宇瞳光学科技股份有限公司 | Large aperture stop lens |
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| JP2012173491A (en) * | 2011-02-21 | 2012-09-10 | Olympus Corp | Objective lens for microscope and microscope device provided with objective lens |
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| CN112269238A (en) * | 2020-11-04 | 2021-01-26 | 中国航空工业集团公司洛阳电光设备研究所 | Day and night dual-purpose athermal lens with wide illumination range |
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| CN113777750A (en) * | 2021-09-07 | 2021-12-10 | 广州长步道光学科技有限公司 | Large-caliber multi-configuration near-infrared band industrial imaging lens |
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