CN216526485U - Day and night dual-purpose high-definition glass-plastic mixed prime lens - Google Patents
Day and night dual-purpose high-definition glass-plastic mixed prime lens Download PDFInfo
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Abstract
The utility model discloses a day and night dual-purpose high-definition glass-plastic mixed prime 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: a first lens which is an aspheric plastic lens with negative focal power; the second lens is a spherical glass lens with positive focal power; a third lens which is an aspheric plastic lens with positive focal power; the fourth lens is an aspheric plastic lens with negative focal power; this dual-purpose high clear glass of day night mixes tight shot is moulded, adopts 1 spherical glass and 3 aspheric surface plastics to mix the combination, and the correction aberration that can be fine guarantees enough good image quality, and is with very low costs, can arrange 5MP, 1/2.7 inch's chip in pairs, realizes 24 hours all-weather high definition control, and day night formation of image is confocal, and it is clear to shoot the picture at high temperature +80 ℃ and low temperature-40 ℃, has very high price/performance ratio.
Description
Technical Field
The utility model relates to the technical field of optical imaging, in particular to a day and night high-definition glass-plastic mixed prime lens.
Background
With the continuous progress of society, the safety consciousness of people is continuously improved, the monitoring lens can be seen everywhere in the avenue and the alley, in recent years, a plurality of series products are released by the monitoring lens aiming at different use purposes or environments, the requirements of people on the lens are higher and higher, the whole trend is higher and higher in performance and low in cost, and therefore the monitoring camera with high definition pixels and low cost can gradually occupy the market in the future. The existing lens on the market has the problems of poor image quality and high cost, for example, poor image quality in bad weather, difficult confocal imaging in daytime and at night, and the performance and the cost of the lens are to be improved.
The object of the utility model is therefore: aiming at the defects of the prior art, the day and night dual-purpose high-definition glass-plastic mixed prime lens is provided.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to overcoming the above-mentioned deficiencies and providing a solution to at least one of the problems set forth above.
The utility model provides a dual-purpose high clear glass of day night is moulded and is mixed tight shot defines the surface that lens is close to object plane one side and is the object side, and the surface that lens is close to image plane one side is the image side, includes in proper order along the camera lens optical axis by object side to image side:
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;
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;
an aperture stop (8) located between the first lens (1) and the second lens (2);
the optical filter (5), the optical filter (5) is made of H-K9L;
an image pickup element (7);
a protective glass (6) integrated on the sensor, i.e. the image acquisition element (7);
the ratio of the focal length of each lens of the lens to the total focal length of the system meets the following conditions:
1.21≤|f1/f|≤2.13；
1.68≤|f2/f|≤3.74；
0.85≤|f3/f|≤1.07；
0.93≤|f4/f|≤1.25；
1.86≤|f12/f|≤118.94；
in the relation, f is the focal length of the lens optical system, f1 is the focal length of the first lens (1), f2 is the focal length of the second lens (2), f3 is the focal length of the third lens (3), f4 is the focal length of the fourth lens (4), and f12 is the focal lengths of the first lens (1) and the second lens (2), and by reasonably matching the focal powers of the lenses, the aberration of the system is favorably reduced, and the resolving power of the system is improved.
Preferably, the focal length, refractive index, and radius of curvature of the first lens (1) to the fourth lens (4) satisfy the following conditions:
| f1 | -9.57~-4.68 | ND1 | 1.52~1.56 | R11 | +4.80~+9.21 | R12 | +1.84~+2.39 |
| f2 | +7.56~+16.48 | ND2 | 1.58~1.64 | R21 | +7.82~+23.52 | R22 | -15.66~-6.38 |
| f3 | +3.55~+4.84 | ND3 | 1.52~1.56 | R31 | +4.16~+6.65 | R32 | -3.56~-2.82 |
| f4 | -5.57~-3.87 | ND4 | 1.60~1.66 | R41 | -2.67~-2.23 | R42 | -27.96~-9.68 |
in the above table, "f 1" is the focal length of the first lens (1), "ND 1" is the refractive index of the first lens (1), "R11, R12" is the front and rear surface curvature radius of the first lens (1), "f 2" is the focal length of the second lens (2), "ND 2" is the refractive index of the second lens (2), "R21, R22" is the front and rear surface curvature radius of the second lens (2), "f 3" is the focal length of the third lens (3), "ND 3" is the refractive index of the third lens (3), "R31, R32" is the front and rear surface curvature radius of the third lens (3), "f 4" is the focal length of the fourth lens (4), "ND 4" is the refractive index of the fourth lens (4), "R41, R42" is the front and rear surface curvature radius of the fourth lens (4), "sign" indicates that the direction is negative, and so on.
Preferably, IC/TTL is more than or equal to 0.29;
3.96≤TTL/f≤5.72；
0.16≤OBFL/TTL≤0.30；
in the relation, f is the focal length of the lens optical system; TTL is the total length of the lens optical system; OBFL is the optical back intercept of the lens system, namely the distance from the point, closest to the image surface, of the image side surface of the fourth lens (4) to the image surface; the IC is the full image height of the 1/2.7' chip collocated with the lens system.
Preferably, the aperture of the optical lens is F #, and satisfies that F # is more than or equal to 1.90 and less than or equal to 2.40, the focal length of the optical lens is F, satisfies that F is more than or equal to 3.85 and less than or equal to 4.50, and the total length of the lens optical system is TTL, and satisfies that TTL is less than or equal to 22.50 mm.
Preferably, the aspheric surfaces of the first lens (1), the third lens (3) and the fourth lens (4) are all defined by the following equation of even aspheric surfaces:
Z=
in the formula, k is a conic coefficient of a conic surface, r is a lens height, c is a lens curvature, and A-G are coefficients of 4 th, 6 th, 8 th, 10 th, 12 th, 14 th and 16 th order terms of an aspheric polynomial.
Preferably, the minimum distance between the central axes of the first lens (1) and the second lens (2) is more than or equal to 5.38 mm; the maximum interval between the central axes of the third lens (3) and the fourth lens (4) is less than or equal to 0.27 mm; the interval on the central shaft of each lens is reasonably distributed, so that the sensitivity of the optical lens is favorably reduced, and the optical resolution capability is improved.
Compared with the prior art, the utility model has the beneficial effects that: the utility model relates to a day and night dual-purpose high clear glass-plastic mixed prime lens, which adopts 1 piece of spherical glass and 3 pieces of non-spherical plastic mixed combination, so that the high and low temperature drift of a system can be well corrected, the materials of a first lens to a fourth lens of the utility model respectively adopt positive materials, positive materials and negative materials, the first lens to the fourth lens respectively adopt negative focal power, positive focal power and negative focal power, different materials and distribution combination of focal power lenses, system aberration is well corrected, optical performance is good, the shape and the thickness of each lens are normal, each lens is insensitive, and the lens surface type is simple and easy to manufacture in manufacturability, in the utility model, the low-price glass material with the refractive index of 1.58-1.64 is selected from the materials of glass, the processing cost is relatively low on the market, the utility model has the characteristics of high cost performance, light weight, good performance and low cost, and can be matched with 5MP and 1/2.7 chips through reasonable lens material selection, focal power distribution and optical design optimization, thereby realizing 24-hour all-weather high-definition monitoring, day and night imaging confocal and realizing clear real shooting pictures at high temperature of plus 80 ℃ and low temperature of minus 40 ℃.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of an optical structure according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of an optical path structure according to a first embodiment of the present invention;
FIG. 3 is a normal temperature +20 ℃ defocus plot of 0.435-0.656um visible light in the embodiment of the present invention;
FIG. 4 is a low temperature-40 ℃ defocus plot of 0.435-0.656um visible light in accordance with an embodiment of the present invention;
FIG. 5 is a high temperature +80 ℃ defocus plot of 0.435-0.656um visible light in accordance with one embodiment of the present invention;
FIG. 6 is a field curvature diagram of 0.546um visible light according to an embodiment of the present invention;
FIG. 7 is a distortion diagram of visible light of 0.546um according to an embodiment of the present invention;
FIG. 8 is a graph of relative luminance of 0.546um in visible light according to one embodiment of the present invention;
FIG. 9 is a schematic view of an optical structure according to a second embodiment of the present invention;
fig. 10 is a schematic diagram of an optical path structure according to a second embodiment of the present invention;
FIG. 11 is a normal temperature +20 ℃ defocus plot of 0.435-0.656um visible light in the second embodiment of the present invention;
FIG. 12 is a low-temperature-40 ℃ defocus plot of 0.435-0.656um visible light in the second embodiment of the present invention;
FIG. 13 is a high temperature +80 ℃ defocus plot of 0.435-0.656um visible light in example II of the present invention;
FIG. 14 is a field curvature diagram of 0.546um visible light according to the second embodiment of the present invention;
FIG. 15 is a distortion plot of visible light 0.546um according to the second embodiment of the present invention;
FIG. 16 is a graph of relative luminance of 0.546um in visible light according to the second embodiment of the present invention;
in the figure: a first lens 1; a second lens 2; a third lens 3; a fourth lens 4; an optical filter 5; a cover glass 6; an image pickup element 7; an aperture stop 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 16, in an embodiment of the present invention, a day and night dual-purpose high-definition glass-plastic hybrid prime lens defines a surface of a lens adjacent to an object plane as an object side surface, and a surface of the lens adjacent to an image plane as an image side surface, and sequentially includes, from the object side surface to the image side surface along an optical axis of the lens:
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, and the image side surface of the first lens is a concave surface;
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, and 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, and 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, and the image side surface of the fourth lens is a convex surface;
an aperture stop 8 located between the first lens 1 and the second lens 2;
the optical filter 5, the optical filter 5 is made of H-K9L;
an image pickup element 7;
a cover glass 6 integrated on a sensor, i.e., an image pickup element 7;
in order to make the optical system exhibit better performance, in the design process, the lens materials are reasonably selected, the focal lengths of the lenses are reasonably distributed, and the optical system is reasonably optimized to correct the aberration of the system, so that the performance of the optical system is optimized finally. 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, the focal lengths of the first lens element 1 and the second lens element 2 are f12, the focal length of the entire lens is f, and the ratio of the total focal length of each lens element to the total focal length of the system satisfies the following conditions:
1.21≤|f1/f|≤2.13；
1.68≤|f2/f|≤3.74；
0.85≤|f3/f|≤1.07；
0.93≤|f4/f|≤1.25；
1.86≤|f12/f|≤118.94；
in the relation, "f" is the focal length of the lens optical system, "f 1" is the focal length of the first lens 1, "f 2" is the focal length of the second lens 2, "f 3" is the focal length of the third lens 3, "f 4" is the focal length of the fourth lens 4, and "f 12" is the focal length of the first lens 1 and the second lens 2, and by reasonably matching the focal power of each lens, the aberration of the system is favorably reduced, and the resolving power of the system is improved.
In the embodiment of the utility model, the field angle is more than 103.6 degrees, so that the first lens adopts a meniscus negative-power lens with a convex surface facing an object space, the function of the lens is to rapidly converge light rays, the abbe numbers of the first lens 1, the second lens 2 and the third lens 3 are more than 55.5, and the abbe number of the fourth lens 4 is less than 24, so that the chromatic aberration of the system can be reduced by matching, and the problems of aberration, balance temperature drift, day and night confocal and the like of an optical system are considered, and the focal length, the material and the R value of each lens respectively meet the following conditions:
| f1 | -9.57~-4.68 | ND1 | 1.52~1.56 | R11 | +4.80~+9.21 | R12 | +1.84~+2.39 |
| f2 | +7.56~+16.48 | ND2 | 1.58~1.64 | R21 | +7.82~+23.52 | R22 | -15.66~-6.38 |
| f3 | +3.55~+4.84 | ND3 | 1.52~1.56 | R31 | +4.16~+6.65 | R32 | -3.56~-2.82 |
| f4 | -5.57~-3.87 | ND4 | 1.60~1.66 | R41 | -2.67~-2.23 | R42 | -27.96~-9.68 |
in the above table, "f 1" is a focal length of the first lens 1, "ND 1" is a refractive index of the first lens 1, "R11, R12" is front and rear surface curvature radii of the first lens 1, "f 2" is a focal length of the second lens 2, "ND 2" is a refractive index of the second lens 2, "R21, R22" is a front and rear surface curvature radius of the second lens 2, "f 3" is a focal length of the third lens 3, "ND 3" is a refractive index of the third lens 3, "R31, R32" is a front and rear surface curvature radius of the third lens 3, "f 4" is a focal length of the fourth lens 4, "ND 4" is a refractive index of the fourth lens 4, "R41, R42" is a front and rear surface curvature radius of the fourth lens 4, "a" - "indicates a negative direction, and so on.
The focal length of the integral optical system of the embodiment of the utility model is f, the total optical 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 side surface, of the fourth lens 4 to the image side surface, the total image height of a 1/2.7' chip matched with the lens system is IC, and the following relations are satisfied:
IC/TTL≥0.29；
3.96≤TTL/f≤5.72；
0.16≤OBFL/TTL≤0.30；
the aperture of the embodiment of the utility model is F #, and satisfies that F # is more than or equal to 1.90 and less than or equal to 2.40, the focal length of the optical system is F, satisfies that F is more than or equal to 3.85 and less than or equal to 4.50, the total optical length of the lens system is TTL, and satisfies that TTL is less than or equal to 22.50 mm.
The first lens 1 and the second lens 2 of the embodiment of the utility model have larger distance, and the minimum distance on the central axis is more than or equal to 5.38 mm; the third lens 3 and the fourth lens 4 are relatively close, and the maximum interval on the central axis is less than or equal to 0.27 mm.
Referring to fig. 1 and fig. 2, which are respectively an optical structure diagram and an optical path structure diagram of a first embodiment 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 4.0mm, and an aperture value is 2.0.
In the following table, 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 aspherical Surface K value (conc) of each lens are listed.
Watch 1
| Number of noodles | Radius of curvature R | Center thickness d | Refractive index ND | Abbe constant VD | K |
| 1 | 5.98 | 1.79 | 1.53 | 55.7 | -2.01 |
| 2 | 1.97 | 6.60 | -1.76 | ||
| 3 (diaphragm) | Infinity | 0.16 | |||
| 4 | 10.78 | 3.28 | 1.64 | 55.5 | |
| 5 | -10.78 | 1.47 | |||
| 6 | 4.84 | 2.25 | 1.53 | 55.7 | 1.43 |
| 7 | -2.85 | 0.10 | -1.53 | ||
| 8 | -2.23 | 1.04 | 1.63 | 23.9 | -2.7 |
| 9 | -10.49 | 2.42 | -92.27 | ||
| 10 | Infinity | 0.61 | 1.51 | 64.2 | |
| 11 | Infinity | 2.60 |
In table one, the surface numbers are numbered according to the surface order of the respective lenses, wherein "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 first embodiment of the present invention can be defined by the following equations of even aspheric surfaces:
Z=
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.
The following two lists have the coefficients of the aspheric surfaces of the optical surfaces:
watch two
| Number of noodles | A | B | C | D | E | F | G |
| 1 | -4.16E-03 | 5.14E-05 | 3.77E-06 | -1.22E-07 | -2.38E-09 | 1.69E-10 | -2.28E-12 |
| 2 | 7.71E-03 | -6.74E-04 | -3.29E-05 | 1.96E-05 | -2.27E-06 | 1.37E-07 | -3.77E-09 |
| 6 | -1.99E-03 | -2.60E-05 | -1.07E-04 | 6.19E-06 | -1.47E-06 | 1.25E-07 | -4.67E-08 |
| 7 | 1.77E-03 | 3.78E-04 | 5.30E-05 | -2.94E-05 | -2.97E-06 | 7.93E-07 | -3.39E-08 |
| 8 | 3.82E-03 | -1.38E-05 | 4.21E-05 | 1.64E-05 | -5.57E-06 | -3.40E-07 | 1.30E-07 |
| 9 | 9.54E-03 | 2.23E-04 | -1.28E-04 | 1.64E-05 | 3.77E-06 | -1.21E-06 | 9.70E-08 |
Referring to fig. 9 and 10, which are respectively an optical structure diagram and an optical path structure diagram of a second embodiment 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, the total focal length of the system is 4.0mm, and the aperture value is 2.0.
In the following three, the optical Surface numbers (Surface numbers) 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, respectively.
Watch III
| Noodle sequence number | Radius of curvature R | Center thickness d | Refractive index ND | Abbe constant VD | K |
| 1 | 5.79 | 1.74 | 1.53 | 55.7 | -1.47 |
| 2 | 1.97 | 7.02 | -1.48 | ||
| 3 (diaphragm) | Infinity | 0.21 | |||
| 4 | 10.13 | 2.71 | 1.58 | 61.2 | |
| 5 | -10.13 | 1.88 | |||
| 6 | 4.54 | 2.25 | 1.53 | 55.7 | 1.03 |
| 7 | -2.93 | 0.12 | -1.53 | ||
| 8 | -2.24 | 1.08 | 1.63 | 23.9 | -2.73 |
| 9 | -12.24 | 2.11 | -100.94 | ||
| 10 | Infinity | 0.61 | 1.51 | 64.2 | |
| 11 | Infinity | 2.60 |
In table three, the surface numbers are numbered according to the surface sequence of each lens, wherein "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 1, the third lens 3 and the fourth lens 4 in the second embodiment of the present invention can be defined by the following equation of even aspheric surfaces:
Z=
in the formula, k is a conic coefficient of a quadric surface, r is a lens height, c is a lens curvature, and A-G are coefficients of 4 th, 6 th, 8 th, 10 th, 12 th, 14 th and 16 th orders of aspheric polynomial.
The following four columns have the coefficients of the aspheric surface of each optical surface:
watch four
| Noodle sequence number | A | B | C | D | E | F | G |
| 1 | -4.28E-03 | 4.99E-05 | 3.84E-06 | -1.37E-07 | -1.33E-09 | 1.42E-10 | -2.05E-12 |
| 2 | 3.93E-03 | -2.17E-04 | -3.09E-05 | 9.36E-06 | -7.96E-07 | 4.87E-08 | -1.86E-09 |
| 6 | -2.09E-03 | -2.30E-05 | -1.21E-04 | 9.08E-06 | -3.98E-06 | 1.24E-06 | -1.73E-07 |
| 7 | 2.08E-03 | 7.01E-04 | 3.62E-05 | -4.63E-05 | 2.64E-06 | -1.95E-07 | 2.24E-08 |
| 8 | 5.03E-03 | 4.08E-04 | -4.54E-05 | 2.15E-05 | -5.22E-06 | -5.56E-07 | 1.30E-07 |
| 9 | 1.32E-02 | -2.99E-04 | -9.83E-05 | 2.92E-05 | 3.46E-06 | -1.88E-06 | 1.67E-07 |
In conclusion: referring to fig. 1-16, the day and night dual-purpose high-definition glass-plastic hybrid prime lens adopts a hybrid combination of 1 spherical glass and 3 aspheric plastics, so that system aberration is well corrected, optical performance is good, under the same quality in the industry, each lens is insensitive, lens surface types are simple and easy to manufacture, processing cost is relatively low on the market, high cost performance is achieved, and the lens has the characteristics of good performance and low cost, moreover, the problems of aberration, balance temperature drift, day and night confocal and the like of an optical system are comprehensively considered, through reasonable lens material selection, focal power distribution and optical design optimization, a 5MP and 1/2.7 inch chip can be matched, 24-hour high-definition monitoring is achieved, day and night imaging is guaranteed, all-weather night shooting at night is clear, real pictures are clear in severe environments such as high temperature +80 ℃ and low temperature-40 ℃, the defocusing amount of the high and low temperature is designed to be less than 3um, so that the consistency of image quality under different conditions is realized.
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.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. The utility model provides a dual-purpose high clear glass of day night is moulded and is mixed tight shot defines the surface that lens is close to object plane one side and is the object side, and the surface that lens is close to image plane one side is the image side, and its characterized in that includes according to the preface along the camera lens optical axis by object side to the image side:
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;
the second lens (2) is a spherical glass lens with positive focal power, 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 (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;
an aperture stop (8) located between the first lens (1) and the second lens (2);
the optical filter (5), the optical filter (5) is made of H-K9L;
an image pickup element (7);
a protective glass (6) integrated on the image capturing element (7);
the ratio of the focal length of each lens to the total focal length of the system meets the following conditions:
1.21≤|f1/f|≤2.13；
1.68≤|f2/f|≤3.74；
0.85≤|f3/f|≤1.07；
0.93≤|f4/f|≤1.25；
1.86≤|f12/f|≤118.94；
in the relational expression, "f" is a focal length of the lens optical system, "f 1" is a focal length of the first lens (1), "f 2" is a focal length of the second lens (2), "f 3" is a focal length of the third lens (3), "f 4" is a focal length of the fourth lens (4), and "f 12" is focal lengths of the first lens (1) and the second lens (2).
2. The day and night high-definition glass-plastic hybrid prime lens according to claim 1, wherein the focal length, the refractive index and the curvature radius of the first lens (1) to the fourth lens (4) respectively satisfy the following conditions:
in the above table, "f 1" is the focal length of the first lens (1), "ND 1" is the refractive index of the first lens (1), "R11, R12" is the front and rear surface curvature radius of the first lens (1), "f 2" is the focal length of the second lens (2), "ND 2" is the refractive index of the second lens (2), "R21, R22" is the front and rear surface curvature radius of the second lens (2), "f 3" is the focal length of the third lens (3), "ND 3" is the refractive index of the third lens (3), "R31, R32" is the front and rear surface curvature radius of the third lens (3), "f 4" is the focal length of the fourth lens (4), "ND 4" is the refractive index of the fourth lens (4), "R41, R42" is the front and rear surface curvature radius of the fourth lens (4), "sign" indicates that the direction is negative, and so on.
3. The day and night high-definition glass-plastic hybrid prime lens as claimed in claim 2, wherein IC/TTL is greater than or equal to 0.29;
3.96≤TTL/f≤5.72；
0.16≤OBFL/TTL≤0.30；
in the relation, f is the focal length of the lens optical system; TTL is the total length of the lens optical system; OBFL is the optical back intercept of the lens system, namely the distance from the point, closest to the image surface, of the image side surface of the fourth lens (4) to the image surface; the IC is the full image height of the 1/2.7' chip collocated with the lens system.
4. The lens of claim 3, wherein the aperture of the optical lens is F #, and satisfies 1.90 ≤ F # < 2.40, the focal length of the optical lens is F, satisfies 3.85 ≤ F < 4.50, and the total length of the lens optical system is TTL, and satisfies TTL < 22.50 mm.
5. The day and night high-definition glass-plastic hybrid prime lens according to claim 1, wherein the aspheric surfaces of the first lens (1), the third lens (3) and the fourth lens (4) are all defined by the following equation of even-order aspheric surface:
Z=
in the formula, k is a conic coefficient of a conic surface, r is a lens height, c is a lens curvature, and A-G are coefficients of 4 th, 6 th, 8 th, 10 th, 12 th, 14 th and 16 th order terms of an aspheric polynomial.
6. The day and night high-definition glass-plastic hybrid prime lens according to claim 1, wherein the minimum distance between the central axes of the first lens (1) and the second lens (2) is more than or equal to 5.38 mm; the maximum interval between the central axes of the third lens (3) and the fourth lens (4) is less than or equal to 0.27 mm.
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| CN114280759A (en) * | 2021-12-10 | 2022-04-05 | 东莞市长益光电有限公司 | Day and night dual-purpose high-definition glass-plastic mixed prime lens |
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| CN114280759A (en) * | 2021-12-10 | 2022-04-05 | 东莞市长益光电有限公司 | Day and night dual-purpose high-definition glass-plastic mixed prime lens |
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