CN110673311A - Ultra-wide-angle low-distortion lens - Google Patents
Ultra-wide-angle low-distortion lens Download PDFInfo
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- CN110673311A CN110673311A CN201910937853.0A CN201910937853A CN110673311A CN 110673311 A CN110673311 A CN 110673311A CN 201910937853 A CN201910937853 A CN 201910937853A CN 110673311 A CN110673311 A CN 110673311A
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- 239000011521 glass Substances 0.000 claims abstract description 22
- 230000005499 meniscus Effects 0.000 claims abstract description 21
- 230000003287 optical effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000003384 imaging method Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—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
- G02B13/0015—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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- Physics & Mathematics (AREA)
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Abstract
The invention discloses an ultra-wide-angle low-distortion lens, which comprises a lens body, wherein the lens body sequentially comprises a first glass meniscus lens with a negative focal length, a second lens with a negative focal length, a third lens with a positive focal length, a fourth lens with a positive focal length, a fifth lens with a negative focal length, a sixth lens with a positive focal length, a filter and a light sensitive sheet from an object plane to an image plane, the surface curvature radius of the first glass meniscus lens with the negative focal length close to an object is R1, the integral focal length of the lens body is F, the full-image height of the lens body is H, and the relation is satisfied: R1/H < 3.7, F/H < 0.33. The invention has convenient and rapid use, can realize small distortion, controls the total distortion within-13 percent under the same horizontal angle of view, adopts plastic lenses to replace glass lenses, reduces the weight and is convenient to carry.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to an ultra-wide-angle low-distortion lens.
Background
In recent years, as the application range of the camera lens is more and more extensive, for example, a police law enforcement instrument, a frontier monitoring lens, etc., however, the existing law enforcement instrument and frontier monitoring lens generally have the following defects: the visual angle is not large enough, the aperture is small, the overall dimension is large, the size is large when the device is used, and the occupied space is large. In general, in order to have a wide viewing angle, the optical distortion of the image capturing lens is large, so that the scene at the edge of the image is easily compressed, and the user can view a deformed object. Therefore, in order to avoid the problem of severe deformation of the edge object, a lens design with a narrow viewing angle is usually adopted. Therefore, there is a need for an image capturing lens design that can achieve both wide viewing angle and low compression deformation, and can provide lower manufacturing cost and better imaging quality.
The existing lens has too large distortion reaching 25 percent.
Disclosure of Invention
The invention mainly aims to provide an ultra-wide-angle low-distortion lens which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a low distortion camera lens of super wide angle, includes the camera lens main part, the camera lens main part is from the object plane to image plane in proper order including the first glass meniscus lens that has the negative focal length, has the second lens of negative focal length, has the third lens of positive focal length, has the fourth lens of positive focal length, has the fifth lens of negative focal length, has the sixth lens of positive focal length, filter and photosensing piece, the first glass meniscus lens that has the negative focal length is close to the surface curvature radius that the thing was surveyed and is R1, the whole focus of camera lens main part is F, the full image height of camera lens main part is H, satisfies the relational expression: R1/H < 3.7, F/H < 0.33.
Preferably, the second lens with the negative focal length is a meniscus plastic aspheric lens.
Preferably, the third lens with positive focal length is a biconvex glass spherical lens.
Preferably, the fourth lens with positive focal length is a biconvex plastic aspheric lens.
Preferably, the fifth lens with the negative focal length is a meniscus plastic aspheric lens.
Preferably, the sixth lens with a positive focal length is a biconvex plastic aspheric lens.
Preferably, the surface of the first glass meniscus lens with negative focal length, which faces the object plane, is convex, and the surface of the first glass meniscus lens, which faces the image plane, is concave; the surface of the second lens with the negative focal length, which faces the object plane, is a convex surface, and the surface of the second lens, which faces the image plane, is a concave surface; the surface, facing the object plane, of the fifth lens with the negative focal length is a concave surface, and the surface, facing the image plane, of the fifth lens is a convex surface.
Preferably, the refractive index of the third lens having a positive focal length satisfies: nd3 is greater than 1.84.
Compared with the prior art, the invention has the following beneficial effects: the ultra-wide-angle low-distortion lens has small distortion, the total distortion is controlled within-13% under the same horizontal field angle, and the plastic lens is adopted to replace a glass lens, so that the weight is reduced, and the carrying is convenient.
Drawings
Fig. 1 is a schematic lens diagram of an ultra-wide angle low distortion lens according to the present invention.
FIG. 2 is an analytic view of visible light of an ultra-wide angle low distortion lens according to the present invention.
FIG. 3 is an analytic view of 850nm infrared light from an ultra-wide angle low distortion lens according to the present invention.
Fig. 4 is a Spot diagram of an ultra-wide angle low distortion lens according to the present invention.
FIG. 5 is a field curvature diagram of an ultra-wide angle low distortion lens according to the present invention.
FIG. 6 is a distortion diagram of an ultra-wide angle low distortion lens according to the present invention.
In the figure: 1. a first glass meniscus lens with a negative focal length; 2. a second lens having a negative focal length; 3. a third lens having a positive focal length; 4. a fourth lens having a positive focal length; 5. a fifth lens having a negative focal length; 6. a sixth lens having a positive focal length; 7. a filter plate; 8. a photosensitive sheet; 9. a lens body.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 6, an ultra-wide angle low distortion lens includes a lens body 9, the lens body 9 includes, in order from an object plane to an image plane, a first glass meniscus lens 1 having a negative focal length, a second lens 2 having a negative focal length, a third lens 3 having a positive focal length, a fourth lens 4 having a positive focal length, a fifth lens 5 having a negative focal length, a sixth lens 6 having a positive focal length, a filter 7 and a sensor 8, a surface curvature radius of the first glass meniscus lens 1 having a negative focal length near the object is R1, an overall focal length of the lens body 9 is F, a height of a full image of the lens body 9 is H, and the following relations are satisfied: R1/H < 3.7, F/H < 0.33.
The second lens 2 with negative focal length is a meniscus plastic aspheric lens; the third lens 3 with positive focal length is a biconvex glass spherical lens; the fourth lens 4 with positive focal length is a biconvex plastic aspheric lens; the fifth lens 5 with negative focal length is a meniscus plastic aspheric lens; the sixth lens 6 with positive focal length is a biconvex plastic aspheric lens; the surface of the first glass meniscus lens 1 with the negative focal length, which faces the object plane, is a convex surface, and the surface, which faces the image plane, is a concave surface; the surface of the second lens 2 with the negative focal length, which faces the object plane, is a convex surface, and the surface of the second lens, which faces the image plane, is a concave surface; the surface of the fifth lens 5 with the negative focal length, which faces the object plane, is a concave surface, and the surface of the fifth lens, which faces the image plane, is a convex surface; the refractive index of the third lens 3 having a positive focal length satisfies: nd3 is greater than 1.84.
When the ultra-wide-angle low-distortion lens is used, when the working distance is infinite, the total focal length f of the ultra-wide-angle low-distortion lens is 1.95mm, FNO is 2.0, the horizontal field angle FOV is 111 °, the total lens length TTL is 16.3mm, 400 ten thousand pixel chips can be matched, the full field image height is 6.17mm, and the parameters of the lens group are listed in table 1 in sequence:
TABLE 1
Note: the mirror numbers 1, 2 of the optical system provided in table one sequentially represent two mirror surfaces of the lens 1 in the light incidence direction, the mirror numbers 3, 4 represent two mirror surfaces of the lens 2 in the light incidence direction, the mirror numbers 5, 6 sequentially represent two mirror surfaces of the lens 3 in the light incidence direction, the mirror numbers 7, 8 sequentially represent two mirror surfaces of the lens 4 in the light incidence direction, the mirror numbers 9, 10 sequentially represent two mirror surfaces of the lens 5 in the light incidence direction, and the mirror numbers 11, 12 sequentially represent two mirror surfaces of the lens 6 in the light incidence direction.
From Table 1, it can be obtained
The first glass meniscus lens 1 having a negative focal length has a surface radius of curvature R1 near the object of 22.502602,
R1/H＝22.502602/6.17＝3.64＜3.7，
F/H＝1.95/6.17＝0.316＜0.33，
Nd3＝1.850136，
all meet the requirements;
in addition, in the present patent embodiment, the surfaces S3 and S4 of the second lens 2 having a negative focal length, the surfaces S7 and S8 of the fourth lens 4 having a positive focal length are aspheric surfaces, the surfaces S9 and S10 of the fifth lens 5 having a negative focal length are aspheric surfaces, and the surfaces S11 and S12 of the sixth lens 6 having a positive focal length are aspheric surfaces, and their aspheric related values are listed in the order of table 2:
TABLE 2
In the above table of the embodiment of the present invention, Index is a refractive Index, Radius is a curvature Radius, and focal lengths of the first glass meniscus lens 1 having a negative focal length to the sixth lens 6 having a positive focal length are f1 to f6, respectively. The six lenses are adopted, the first lens is made of glass, and the lens has the characteristics of wear resistance, scraping resistance, acid and alkali corrosion resistance and the like, wherein the four lenses are plastic aspheric lenses, so that the weight and the manufacturing cost of the lens are effectively reduced, and the product competitiveness is improved; through the reasonable use of the plastic aspheric lens and the limitation of the focal power of each lens, the distortion of the wide-angle lens is effectively improved, and the image pickup effect is improved. The liquid crystal display screen has the characteristics of large field angle, low distortion, high resolution and low cost, and overcomes the defects in the prior art.
Fig. 2 and fig. 3 are graphs of Modulation Transfer Function (MTF) values at 20 degrees celsius according to an embodiment of the present invention, where the MTF value is determined based on the parameters in table 1, and the most important measurement of the resolution of the optical lens is that the MTF value is certainly greater than 0 and less than 1, and the MTF value is closer to 1 in the present technical field, which indicates that the performance of the optical lens is more excellent, i.e., the resolution is higher; the variable is the spatial frequency, namely how many lines can be presented in a range of one mm to measure the spatial frequency, and the unit is expressed by lp/mm; a fixed high frequency (e.g. 250lp/mm) curve represents the lens resolution characteristic, the higher this curve, the higher the lens resolution, and the ordinate is the MTF value. The distance from the center of the image field to the measuring point can be set on the abscissa, the lens is of a symmetrical structure taking the optical axis as the center, the change rule of the imaging quality from the center to each direction is the same, and due to the influence of factors such as aberration and the like, the farther the distance between a certain point in the image field and the center of the image field is, the MTF value generally has a descending trend. Therefore, the distance from the center of the image field to the edge of the image field is taken as the abscissa, and the imaging quality of the edge of the lens can be reflected.
In addition, at a position deviated from the center of the image field, MTF values measured by the sinusoidal grating of the line in the tangential direction and the line in the radial direction are different. The MTF curve produced by a line parallel to the diameter is called the sagittal curve, denoted s (sagittal), and the MTF curve produced by a line parallel to the tangent is called the meridional curve, denoted t (tangential). Therefore, there are generally two MTF curves, i.e. S curve and T curve, and in fig. 2 and fig. 3, there are multiple sets of MTF curves from the image field center to the image field edge, which reflects that the lens system has higher resolution, which can reach 500 ten thousand pixels, and the optical performance is greatly improved compared with the current mainstream optical system.
Fig. 4 is a dot array diagram corresponding to the optical lens, and the centroid radius and the geometric radius of the dot array diagram are shown, so that good imaging quality can be achieved.
The field curve diagram corresponding to the visible light part of the lens system consists of three curves T and three curves S; wherein, the three curves T respectively represent the aberration of the meridional beams (tagential Rays) corresponding to the three wavelengths (486nm, 587nm and 656nm), the three curves S respectively represent the aberration of the sagittal beams (Sagittial Rays) corresponding to the three wavelengths (486nm, 587nm and 656nm), and the smaller the meridional field curvature value and the sagittal field curvature value are, the better the imaging quality is. As shown in FIG. 5, the meridian curvature of field is controlled within-0.02 mm, and the sagittal curvature of field is controlled within-0.02 mm.
In summary, the ultra-wide-angle low-distortion lens, the ultra-wide-angle, small-distortion high-resolution, portable and low-cost lens overcome the defects in the prior art. The six lenses are adopted, the first lens is made of glass, and the lens has the characteristics of wear resistance, scraping resistance, acid and alkali corrosion resistance and the like, wherein the four lenses are plastic aspheric lenses, so that the weight and the manufacturing cost of the lens are effectively reduced, and the product competitiveness is improved; through the reasonable use of the plastic aspheric lens and the limitation of the focal power of each lens, the distortion of the wide-angle lens is effectively improved, and the image pickup effect is improved. The liquid crystal display screen has the characteristics of large field angle, low distortion, high resolution and low cost, and overcomes the defects in the prior art.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a low distortion lens of super wide angle, includes lens main part (9), its characterized in that: lens main part (9) are from object plane to image plane in proper order including first glass meniscus lens (1) that have negative focal length, second lens (2) that have negative focal length, third lens (3) that have positive focal length, fourth lens (4) that have positive focal length, fifth lens (5) that have negative focal length, sixth lens (6) that have positive focal length, filter (7) and photosensing piece (8), first glass meniscus lens (1) that have negative focal length are close to the surface radius of curvature of thing survey and are R1, the whole focus of lens main part (9) is F, the holographic height of lens main part (9) is H, satisfies the relation: R1/H < 3.7, F/H < 0.33.
2. An ultra-wide angle low distortion lens as claimed in claim 1, characterized in that: the second lens (2) with the negative focal length is a meniscus plastic aspheric lens.
3. An ultra-wide angle low distortion lens as claimed in claim 1, characterized in that: the third lens (3) with the positive focal length is a biconvex glass spherical lens.
4. An ultra-wide angle low distortion lens as claimed in claim 1, characterized in that: the fourth lens (4) with the positive focal length is a biconvex plastic aspheric lens.
5. An ultra-wide angle low distortion lens as claimed in claim 1, characterized in that: the fifth lens (5) with the negative focal length is a meniscus plastic aspheric lens.
6. An ultra-wide angle low distortion lens as claimed in claim 1, characterized in that: the sixth lens (6) with the positive focal length is a biconvex plastic aspheric lens.
7. An ultra-wide angle low distortion lens as claimed in claim 1, characterized in that: the surface of the first glass meniscus lens (1) with the negative focal length, which faces the object plane, is a convex surface, and the surface, which faces the image plane, is a concave surface; the surface of the second lens (2) with the negative focal length, which faces the object plane, is a convex surface, and the surface of the second lens, which faces the image plane, is a concave surface; the surface of the fifth lens (5) with the negative focal length, which faces the object plane, is a concave surface, and the surface of the fifth lens, which faces the image plane, is a convex surface.
8. An ultra-wide angle low distortion lens as claimed in claim 1, characterized in that: the refractive index of the third lens (3) with the positive focal length satisfies: nd3 is greater than 1.84.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021168880A1 (en) * | 2020-02-24 | 2021-09-02 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| CN114002819A (en) * | 2021-11-26 | 2022-02-01 | 福建福光股份有限公司 | Large-aperture high-definition day and night dual-purpose fixed-focus optical lens |
| CN114879347A (en) * | 2022-07-01 | 2022-08-09 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| CN115917390A (en) * | 2020-05-19 | 2023-04-04 | 业纳光学系统有限公司 | Objective lens, use of an objective lens, measuring system comprising an objective lens and use of a bi-aspherical plastic lens in an objective lens |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021168880A1 (en) * | 2020-02-24 | 2021-09-02 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
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| CN114879347A (en) * | 2022-07-01 | 2022-08-09 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
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