CN210639335U - Ultra-wide-angle low-distortion lens - Google Patents
Ultra-wide-angle low-distortion lens Download PDFInfo
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- CN210639335U CN210639335U CN201921648594.1U CN201921648594U CN210639335U CN 210639335 U CN210639335 U CN 210639335U CN 201921648594 U CN201921648594 U CN 201921648594U CN 210639335 U CN210639335 U CN 210639335U
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Abstract
The utility model discloses a low distortion camera lens of super wide angle, including the camera lens main part, the camera lens main part has the second lens of negative focal length from the object plane to image plane including the first glass meniscus lens that has negative focal length in proper order, 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 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. The utility model discloses convenient to use is swift, can realize distortion diminishing, and under the same horizontal angle of vision, the control of total distortion is within-13%, adopts the plastic lens to replace the glass lens, weight reduction, portable.
Description
Technical Field
The utility model relates to an optical imaging technical field, in particular to low distortion camera lens of super wide angle.
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.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a super wide angle low distortion lens, which can effectively solve the problems of the background art.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
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 utility model discloses following beneficial effect has: 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 the utility model relates to a lens schematic diagram of ultra-wide angle low distortion camera lens.
Fig. 2 is an analytic view of the visible light of the ultra-wide angle low distortion lens of the present invention.
Fig. 3 is an analytic view of 850nm infrared light from the ultra-wide angle low distortion lens of the present invention.
Fig. 4 is the utility model relates to a Spot picture of low distortion camera lens of super wide angle.
Fig. 5 is a field curvature diagram of the ultra-wide angle low distortion lens of the present invention.
Fig. 6 is a distortion diagram of the ultra-wide angle low distortion lens of 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, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following 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.
It should be noted that, the utility model relates to a low distortion camera lens of super wide angle, during the use, when working distance is infinity, the total focal length f of low distortion camera lens of super wide angle is 1.95mm, FNO 2.0, horizontal field angle FOV 111, the total length TTL of camera lens is 16.3mm, can match 400 ten thousand pixel chips, the high 6.17mm of full field of vision, each item parameter of battery of lens is listed in table 1 in proper order:
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.
To summarize, the utility model discloses a super wide-angle low distortion camera lens, super wide-angle, little distortion high resolution, light and low-cost camera lens to overcome the weak point among 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 basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110673311A (en) * | 2019-09-30 | 2020-01-10 | 江西特莱斯光学有限公司 | Ultra-wide-angle low-distortion lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110673311A (en) * | 2019-09-30 | 2020-01-10 | 江西特莱斯光学有限公司 | Ultra-wide-angle low-distortion lens |
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