CN113568145B - Large-aperture athermalized 5MP glass-plastic hybrid lens - Google Patents
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- CN113568145B CN113568145B CN202110832840.4A CN202110832840A CN113568145B CN 113568145 B CN113568145 B CN 113568145B CN 202110832840 A CN202110832840 A CN 202110832840A CN 113568145 B CN113568145 B CN 113568145B
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- 239000011521 glass Substances 0.000 claims abstract description 13
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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
- G02B13/004—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 four lenses
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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
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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
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- G02B13/00—Optical objectives specially designed for the purposes specified below
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Abstract
The invention discloses a large-aperture athermalized 5MP glass-plastic hybrid lens, which defines the surface of one side of a lens, which is adjacent to an object plane, as an object side surface, and the surface of one side of the lens, which is adjacent to an image plane, as an image side surface, and sequentially comprises the following components from the object side to the image side along the optical axis of the lens: the first lens is an aspheric plastic lens with negative focal power, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, the second lens is a spherical glass lens with positive focal power, the object side surface of the second lens is a convex surface, the image side surface of the second lens is a convex surface, the object side surface of the third lens is a convex surface, the third lens is an aspheric plastic lens with positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens is an aspheric plastic lens with negative focal power, and the object side surface of the fourth lens is a concave surface while the image side surface is a convex surface. The large-aperture athermalized 5MP glass-plastic hybrid lens adopts the hybrid combination of the sheet spherical glass and the sheet non-spherical plastic, and all the lenses are insensitive under the condition of achieving the same quality in the industry, and the lens surface type is simple and easy to manufacture.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a large-aperture athermalized 5MP glass-plastic hybrid lens.
Background
With the continuous development of modern economy, people's living standard is running to comprehensive well-being, and the definition of high-quality life not only stays in the aspect of eating and drinking, but also pays more attention to the self safety and property safety problems caused by the outside world. At present, besides important places such as banks, highways, hotels, government offices and the like, monitoring lenses can be seen in many intelligent communities and even at corners of roads, and development of the field of security monitoring is promoted. In recent years, many series of products have been introduced for monitoring lenses for different purposes of use or environments, and people are pursuing high performance of the lenses and simultaneously pursuing minimization of cost of the lenses.
The traditional security monitoring lens usually adopts a full-glass structure, such as patent numbers CN201464695U, CN103513400A and the like, and such a lens has high price, large volume, heavier weight and poorer imaging quality, and can not meet the market demand.
Disclosure of Invention
The invention aims to provide a large-aperture athermalized 5MP glass-plastic hybrid lens to solve the problems that the conventional security monitoring lens in the background art usually adopts an all-glass structure, and the lens has high price, large volume, heavier weight and poorer imaging quality and cannot meet the market demand.
In order to achieve the purpose, the invention provides the following technical scheme: a large-aperture athermalized 5MP glass-plastic hybrid lens defines the surface of the lens adjacent to an object plane as an object side surface and the surface of the lens adjacent to an image plane as an image side surface, and comprises the following components from the object side to the image side along the optical axis of the lens:
the first lens is an aspheric plastic lens with negative focal power, and the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens is a spherical glass lens with positive focal power, the object side surface of the second lens is a convex surface, the image side surface of the second lens is a convex surface, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface;
the third lens is an aspheric plastic lens with positive focal power, and the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
the fourth lens is an aspheric plastic lens with negative focal power, and the object side surface of the fourth lens is a concave surface while the image side surface is a convex surface;
an aperture diaphragm;
the red filter is made of H-K9L;
a cover glass integrated on a sensor (image sensor);
an image pickup element;
the ratio of each lens to the total focal length of the system of the lens meets the following conditions:
1.20<|f1/f|<3.81；
1.13<|f2/f|<4.48；
0.55<|f3/f|<1.81；
0.39<|f4/f|<5.91；
in the relation, "f" is the focal length of the lens optical system, "f1" is the focal length of the first lens, "f2" is the focal length of the second lens, and so on.
Preferably, the focal length, refractive index, and radius of curvature of the first to fourth lenses satisfy the following conditions, as shown in fig. 3, where "f1" is the focal length of the first lens, "ND1" is the refractive index of the first lens, "R11, R12" are the front and rear surface radii of curvature of the first lens, "a" - "indicates a negative direction, and so on, in fig. 3.
Preferably, DFOV/TTL >4.59;
CRA/DFOV<0.19；
1.13<OBFL/EFL<2.03；
AC3>0.01；
IC/TTL>0.29；
in the relational expression, the focal length of the lens optical system is EFL; the total length of the lens optical system is TTL; the optical rear intercept of the lens system is OBFL, namely the distance from the point, closest to the image surface, of the image side surface of the fourth lens to the image surface; the field angle of the lens system is DFOV, the principal ray incident angle is CRA, the image height which can be received by an image plane is IC, and the distance between the central axes of the third lens and the fourth lens is AC3.
Preferably, the aperture of the optical lens is F #, and satisfies that F #, is greater than or equal to 1.4, is less than or equal to 2.5, the total focal length of the optical lens is EFL, satisfies that EFL is greater than or equal to 2.0mm, is less than or equal to 6.7mm, and the total length of the lens optical system is TTL, and satisfies that TTL is less than or equal to 23mm.
Preferably, the aspheric surfaces of the first lens, the third lens and the fourth lens are all defined by the following equation for even aspheric surfaces:
in the formula, k is conic coefficient, r is lens height, c is lens curvature, and A-G are coefficients of 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order and 16 th order of aspheric polynomial.
Preferably, the distance between the first lens and the second lens is larger, and the minimum distance is more than or equal to 7.33mm; the third lens and the fourth lens are close to each other, and in order to ensure the processing manufacturability, the minimum interval is more than or equal to 0.01mm.
Compared with the prior art, the invention has the beneficial effects that: the large-aperture athermalized 5MP glass-plastic hybrid lens adopts the mixed combination of 1 piece of spherical glass and 3 pieces of aspheric plastic, and under the condition of achieving the same quality in the industry, each lens is insensitive, the lens surface type is simple and easy to manufacture, and the large-aperture athermalized 5MP glass-plastic hybrid lens has the characteristics of high cost performance, small volume, light weight, good performance and low cost, and can be matched with a chip with 5MP and 1/2.7 inch through reasonable lens material selection, focal power distribution and optical design optimization to realize 24-hour all-weather high-definition monitoring, the shot picture is clear at high temperature plus 80 ℃ and low temperature minus 40 ℃, the processing cost is relatively low on the market, and the cost performance is high.
Drawings
FIG. 1 is a schematic diagram of an optical structure according to the present invention;
FIG. 2 is a schematic diagram of the optical path structure of the present invention;
FIG. 3 is a schematic diagram illustrating focal lengths, refractive indices and radii of curvature of first to fourth lenses according to the present invention;
FIG. 4 is a schematic representation of data in order from an object side to an image side according to the present disclosure;
FIG. 5 is a schematic diagram of coefficients of an aspheric surface of an optical surface according to the present invention;
FIG. 6 is a defocus curve of 0.435-0.656um visible light at room temperature and 20 deg.C;
FIG. 7 is a low temperature-40 ℃ defocus plot of 0.435-0.656um visible light in accordance with the present invention;
FIG. 8 is a high temperature +80 ℃ defocus plot of 0.435-0.656um visible light in accordance with the present invention;
FIG. 9 is the field curvature of 0.546um for visible light of the present invention;
FIG. 10 is a distortion plot of visible light 0.546um according to the present invention;
FIG. 11 is a graph of the relative illumination of 0.546um in visible light according to the present invention.
In the figure: 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. an aperture diaphragm; 6. a red filter; 7. protecting glass; 8. an image capturing element.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1-11, the present invention provides a technical solution: a large-aperture athermalized 5MP glass-plastic hybrid lens, wherein a surface of a lens adjacent to an object plane is an object side surface, and a surface of the lens adjacent to an image plane is an image side surface, and as shown in fig. 1, the lens sequentially comprises, from an object side to an image side along an optical axis of the lens: the first aspheric plastic lens with negative focal power has a convex object-side surface and a concave image-side surface; the second spherical glass lens with negative focal power has a convex object-side surface and a convex image-side surface; the object side surface of the third aspheric plastic lens with positive focal power is a convex surface, and the image side surface of the third aspheric plastic lens is a convex surface; the fourth aspheric plastic lens with positive focal power has a concave object-side surface and a convex image-side surface; an aperture diaphragm 5 is arranged between the first lens 1 and the second lens 2, and a red filter 6, a protective glass 7 and an image acquisition element 8 are arranged behind the aperture diaphragm.
In order to enable an optical system to have better performance, in the design process, lens materials are reasonably selected, the focal length of each lens is reasonably distributed, the optical system is reasonably optimized, the performance of the optical system is finally optimized, the imaging quality of the optical system is affected by the existence of aberration of the optical system generally, the correction of the aberration is the key point of the optimization of the optical system, and various methods for correcting the aberration are provided. Referring to fig. 1, in the embodiment of the present invention, the focal length of the first lens element 1 is f1, the focal length of the second lens element 2 is f2, the focal length of the third lens element 3 is f3, the focal length of the fourth lens element 4 is f4, and the focal length of the entire lens system is f, and the ratio of each lens element to the total focal length of the system satisfies the following conditions:
1.20<|f1/f|<3.81
1.13<|f2/f|<4.48
0.55<|f3/f|<1.81
0.39<|f4/f|<5.91
the field angle of the invention is more than 110 degrees, and the focal length, the material and the R value of each lens respectively meet the following conditions: as shown in fig. 3, "f1" is the focal length of the first lens, "ND1" is the refractive index of the first lens, "R11, R12" are the front and rear surface radii of curvature of the first lens, "-" indicates that the direction is negative, and so on in fig. 3.
The focal length of the integral optical system is EFL, the optical total length of the lens system is TTL, the optical back intercept of the lens system is OBFL, namely the distance from the point, closest to the image plane, of the image side surface of the sixth lens to the image plane, the field angle of the lens system is DFOV, the incident angle of a chief ray is CRA, the image height which can be received by the image plane is IC, and the following relations are satisfied:
DFOV/TTL>4.59
CRA/DFOV<0.19
1.13<OBFL/EFL<2.03
AC3>0.01
IC/TTL>0.29
the aperture of the optical lens is F #, and the requirement that the F #, is more than or equal to 1.4 and less than or equal to 2.5 is met, the total focal length of the optical lens is EFL, the requirement that the EFL is more than or equal to 2.0mm and less than or equal to 6.7mm is met, the total length of a lens optical system is TTL, and the requirement that the TTL is less than or equal to 23mm is met.
In the embodiment, the distance between the first lens 1 and the second lens 2 is larger, and the minimum distance is more than or equal to 7.33mm; in the embodiment, the third lens 3 and the fourth lens 4 are relatively close to each other, and the minimum distance therebetween is not less than 0.01mm in order to ensure the manufacturability.
Referring to fig. 1 and fig. 2, which are respectively a schematic diagram of an optical structure and a schematic diagram of an optical path structure of the present invention, the second lens 2 is a glass spherical surface, the first lens 1, the third lens 3, and the fourth lens 4 are plastic aspheric surfaces, a total focal length of the system is 3.94mm, and an aperture value is 1.60.
In fig. 4, the number of optical surfaces (surface number) in order from the object side to the image side, the radius of curvature R (unit: mm) of each lens, the center thickness d (unit: mm) of each lens, the refractive index (ND) and abbe constant (VD) of each lens, and the aspheric K value (conc) of each lens are listed.
In fig. 4, the surface numbers are numbered according to the surface order of the respective lenses, where "1" represents the front surface of the first lens 1, "2" represents the rear surface of the first lens 1, and so on; the radius of curvature represents the degree of curvature of the lens surface, positive values represent the surface curving to the image plane side, and negative values represent the surface curving to the object plane side, wherein "Infinity" represents the surface being planar; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the deflection capability of the current lens material to light rays, and the Abbe number represents the dispersion characteristic of the current lens material to the light rays; the K value represents the magnitude of the best fitting conic coefficient for the aspheric surface.
The aspheric surfaces of the first lens element 1, the third lens element 3 and the fourth lens element 4 according to the embodiment of the present invention can be defined by the following equation of even aspheric surfaces:
in the formula, k is conic coefficient, r is lens height, c is lens curvature, and A-G are coefficients of 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order and 16 th order of aspheric polynomial.
FIG. 5 lists coefficients of aspheric surfaces with optical surfaces.
In summary, the following steps: the large-aperture athermalized 5MP glass-plastic hybrid lens adopts the mixed combination of 1 piece of spherical glass and 3 pieces of aspheric plastic, and under the condition of achieving the same quality in the industry, each lens is insensitive, the lens surface type is simple and easy to manufacture, and the large-aperture athermalized 5MP glass-plastic hybrid lens has the characteristics of high cost performance, small volume, light weight, good performance and low cost, and can be matched with a chip with 5MP and 1/2.7 inch through reasonable lens material selection, focal power distribution and optical design optimization to realize 24-hour all-weather high-definition monitoring, the shot picture is clear at high temperature plus 80 ℃ and low temperature minus 40 ℃, the processing cost is relatively low on the market, and the cost performance is high.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a big light ring does not have thermalization 5MP glass and moulds compound camera lens which characterized in that: defining the surface of the lens adjacent to the object plane as an object side surface, and the surface of the lens adjacent to the image plane as an image side surface, sequentially from the object side to the image side along the optical axis of the lens, the lens is composed of the following structures:
the first lens (1) is an aspheric plastic lens with negative focal power, and the object side surface of the first lens is a convex surface while the image side surface of the first lens is a concave surface;
an aperture stop (5);
the second lens (2) is a spherical glass lens with positive focal power, and the object side surface of the second lens is a convex surface while the image side surface of the second lens is a convex surface;
the third lens (3) is an aspheric plastic lens with positive focal power, and the object side surface of the third lens is a convex surface while the image side surface of the third lens is a convex surface;
the fourth lens (4) is an aspheric plastic lens with negative focal power, and the object side surface of the fourth lens is a concave surface while the image side surface of the fourth lens is a convex surface;
the red filter (6), the red filter (6) is made of H-K9L;
a cover glass (7) integrated on the image sensor;
an image pickup element (8);
the ratio of each lens to the total focal length of the system of the lens meets the following conditions:
1.20<|f1/f|<3.81；
1.13<|f2/f|<4.48；
0.55<|f3/f|<1.81；
0.39<|f4/f|<5.91；
in the relation, "f" is a focal length of the lens optical system, "f1" is a focal length of the first lens (1), "f2" is a focal length of the second lens (2), "f3" is a focal length of the third lens (3), "f4" is a focal length of the fourth lens (4), and the focal length, refractive index, and radius of curvature of the first lens (1) to the fourth lens (4) satisfy the following conditions, respectively: -28.14mm yarn-over f1-5.25mm, 1.53 yarn-over ND1 yarn-over 1.54,
+4.28mm<R11<+8.25mm，+1.88mm<R12<+3.27mm；
+8.34mm<f2<+11.75mm，1.59<ND2<1.60，+7.49mm<R21<+20.37mm，
-14.15mm<R22<-7.86mm；
+3.70mm<f3<+4.36mm，1.53<ND3<1.54，+4.18mm<R31<+4.94mm，
-4.41mm<R32<-2.69mm；
-13.69mm<f4<-2.92mm，1.63<ND4<1.64，-2.90mm<R41<-1.87mm，
-622.67mm are woven into R42< -3.53mm; wherein "f1" is a focal length of the first lens, "ND1" is a refractive index of the first lens (1), "R11, R12" is front and rear surface curvature radii of the first lens (1), "f2" is a focal length of the second lens (2), "ND2" is a refractive index of the second lens (2), "R21, R22" is front and rear surface curvature radii of the second lens (2), "f3" is a focal length of the third lens (3), "ND3" is a refractive index of the third lens (3), "R31, R32" is front and rear surface curvature radii of the third lens (3), "f4" is a focal length of the fourth lens (4), "ND4" is a refractive index of the fourth lens (4), "R41, R42" is front and rear surface curvature radii of the fourth lens (4), "negative" - "is indicated in the negative direction;
wherein DFOV/TTL >4.59;
CRA/DFOV<0.19；
1.13<OBFL/EFL<2.03；
AC3>0.01；
IC/TTL>0.29；
in the relational expression, the focal length of the lens optical system is EFL; the total length of the lens optical system is TTL; the optical rear intercept of the lens system is OBFL, namely the distance from a point, closest to the image surface, of the image side surface of the fourth lens (4) to the image surface; the field angle of the lens system is DFOV, the principal ray incident angle is CRA, the image height which can be received by an image surface is IC, and the distance between the central axes of the third lens (3) and the fourth lens (4) is AC3.
2. The large-aperture athermalized 5MP glass-plastic hybrid lens as claimed in claim 1, wherein: the aperture of the lens optical system is F #, the requirement that F #, is more than or equal to 1.4 and less than or equal to 2.5 is met, the total focal length of the lens optical system is EFL, the requirement that EFL is more than or equal to 2.0mm and less than or equal to 6.7mm is met, the total length of the lens optical system is TTL, and the requirement that TTL is less than or equal to 23mm is met.
3. The large-aperture athermalized 5MP glass-plastic hybrid lens as claimed in claim 1, wherein: the aspheric surfaces of the first lens (1), the third lens (3) and the fourth lens (4) can be defined by the following equation of even aspheric surfaces:
in the formula, k is conic coefficient, r is lens height, c is lens curvature, and A-G are coefficients of 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order and 16 th order of aspheric polynomial.
4. The large-aperture athermalized 5MP glass-plastic hybrid lens as claimed in claim 1, wherein: the distance between the first lens (1) and the second lens (2) is large, and the minimum distance is more than or equal to 7.33mm; the third lens (3) and the fourth lens (4) are close to each other, and the minimum interval is more than or equal to 0.01mm in order to ensure the processing manufacturability.
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| CN205353446U (en) * | 2016-01-31 | 2016-06-29 | 威海嘉瑞光电科技有限公司 | Intelligence wide angle high definition camera lens's for house optical system |
| TWI588531B (en) * | 2016-07-21 | 2017-06-21 | Tan Cian Technology Co Ltd | Wide angle imaging lens group |
| CN208351114U (en) * | 2018-07-18 | 2019-01-08 | 深圳奥比中光科技有限公司 | A kind of glass modeling hybrid lens system and Optical devices |
| CN110221412B (en) * | 2019-06-30 | 2021-12-14 | 瑞声光学解决方案私人有限公司 | Image pickup optical lens |
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